/* * linux/drivers/ide/ide-tape.c Version 1.16f Dec 15, 1999 * * Copyright (C) 1995 - 1999 Gadi Oxman * * This driver was constructed as a student project in the software laboratory * of the faculty of electrical engineering in the Technion - Israel's * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. * * It is hereby placed under the terms of the GNU general public license. * (See linux/COPYING). */ /* * IDE ATAPI streaming tape driver. * * This driver is a part of the Linux ide driver and works in co-operation * with linux/drivers/block/ide.c. * * The driver, in co-operation with ide.c, basically traverses the * request-list for the block device interface. The character device * interface, on the other hand, creates new requests, adds them * to the request-list of the block device, and waits for their completion. * * Pipelined operation mode is now supported on both reads and writes. * * The block device major and minor numbers are determined from the * tape's relative position in the ide interfaces, as explained in ide.c. * * The character device interface consists of the following devices: * * ht0 major 37, minor 0 first IDE tape, rewind on close. * ht1 major 37, minor 1 second IDE tape, rewind on close. * ... * nht0 major 37, minor 128 first IDE tape, no rewind on close. * nht1 major 37, minor 129 second IDE tape, no rewind on close. * ... * * Run linux/scripts/MAKEDEV.ide to create the above entries. * * The general magnetic tape commands compatible interface, as defined by * include/linux/mtio.h, is accessible through the character device. * * General ide driver configuration options, such as the interrupt-unmask * flag, can be configured by issuing an ioctl to the block device interface, * as any other ide device. * * Our own ide-tape ioctl's can be issued to either the block device or * the character device interface. * * Maximal throughput with minimal bus load will usually be achieved in the * following scenario: * * 1. ide-tape is operating in the pipelined operation mode. * 2. No buffering is performed by the user backup program. * * Testing was done with a 2 GB CONNER CTMA 4000 IDE ATAPI Streaming Tape Drive. * * Ver 0.1 Nov 1 95 Pre-working code :-) * Ver 0.2 Nov 23 95 A short backup (few megabytes) and restore procedure * was successful ! (Using tar cvf ... on the block * device interface). * A longer backup resulted in major swapping, bad * overall Linux performance and eventually failed as * we received non serial read-ahead requests from the * buffer cache. * Ver 0.3 Nov 28 95 Long backups are now possible, thanks to the * character device interface. Linux's responsiveness * and performance doesn't seem to be much affected * from the background backup procedure. * Some general mtio.h magnetic tape operations are * now supported by our character device. As a result, * popular tape utilities are starting to work with * ide tapes :-) * The following configurations were tested: * 1. An IDE ATAPI TAPE shares the same interface * and irq with an IDE ATAPI CDROM. * 2. An IDE ATAPI TAPE shares the same interface * and irq with a normal IDE disk. * Both configurations seemed to work just fine ! * However, to be on the safe side, it is meanwhile * recommended to give the IDE TAPE its own interface * and irq. * The one thing which needs to be done here is to * add a "request postpone" feature to ide.c, * so that we won't have to wait for the tape to finish * performing a long media access (DSC) request (such * as a rewind) before we can access the other device * on the same interface. This effect doesn't disturb * normal operation most of the time because read/write * requests are relatively fast, and once we are * performing one tape r/w request, a lot of requests * from the other device can be queued and ide.c will * service all of them after this single tape request. * Ver 1.0 Dec 11 95 Integrated into Linux 1.3.46 development tree. * On each read / write request, we now ask the drive * if we can transfer a constant number of bytes * (a parameter of the drive) only to its buffers, * without causing actual media access. If we can't, * we just wait until we can by polling the DSC bit. * This ensures that while we are not transferring * more bytes than the constant referred to above, the * interrupt latency will not become too high and * we won't cause an interrupt timeout, as happened * occasionally in the previous version. * While polling for DSC, the current request is * postponed and ide.c is free to handle requests from * the other device. This is handled transparently to * ide.c. The hwgroup locking method which was used * in the previous version was removed. * Use of new general features which are provided by * ide.c for use with atapi devices. * (Programming done by Mark Lord) * Few potential bug fixes (Again, suggested by Mark) * Single character device data transfers are now * not limited in size, as they were before. * We are asking the tape about its recommended * transfer unit and send a larger data transfer * as several transfers of the above size. * For best results, use an integral number of this * basic unit (which is shown during driver * initialization). I will soon add an ioctl to get * this important parameter. * Our data transfer buffer is allocated on startup, * rather than before each data transfer. This should * ensure that we will indeed have a data buffer. * Ver 1.1 Dec 14 95 Fixed random problems which occurred when the tape * shared an interface with another device. * (poll_for_dsc was a complete mess). * Removed some old (non-active) code which had * to do with supporting buffer cache originated * requests. * The block device interface can now be opened, so * that general ide driver features like the unmask * interrupts flag can be selected with an ioctl. * This is the only use of the block device interface. * New fast pipelined operation mode (currently only on * writes). When using the pipelined mode, the * throughput can potentially reach the maximum * tape supported throughput, regardless of the * user backup program. On my tape drive, it sometimes * boosted performance by a factor of 2. Pipelined * mode is enabled by default, but since it has a few * downfalls as well, you may want to disable it. * A short explanation of the pipelined operation mode * is available below. * Ver 1.2 Jan 1 96 Eliminated pipelined mode race condition. * Added pipeline read mode. As a result, restores * are now as fast as backups. * Optimized shared interface behavior. The new behavior * typically results in better IDE bus efficiency and * higher tape throughput. * Pre-calculation of the expected read/write request * service time, based on the tape's parameters. In * the pipelined operation mode, this allows us to * adjust our polling frequency to a much lower value, * and thus to dramatically reduce our load on Linux, * without any decrease in performance. * Implemented additional mtio.h operations. * The recommended user block size is returned by * the MTIOCGET ioctl. * Additional minor changes. * Ver 1.3 Feb 9 96 Fixed pipelined read mode bug which prevented the * use of some block sizes during a restore procedure. * The character device interface will now present a * continuous view of the media - any mix of block sizes * during a backup/restore procedure is supported. The * driver will buffer the requests internally and * convert them to the tape's recommended transfer * unit, making performance almost independent of the * chosen user block size. * Some improvements in error recovery. * By cooperating with ide-dma.c, bus mastering DMA can * now sometimes be used with IDE tape drives as well. * Bus mastering DMA has the potential to dramatically * reduce the CPU's overhead when accessing the device, * and can be enabled by using hdparm -d1 on the tape's * block device interface. For more info, read the * comments in ide-dma.c. * Ver 1.4 Mar 13 96 Fixed serialize support. * Ver 1.5 Apr 12 96 Fixed shared interface operation, broken in 1.3.85. * Fixed pipelined read mode inefficiency. * Fixed nasty null dereferencing bug. * Ver 1.6 Aug 16 96 Fixed FPU usage in the driver. * Fixed end of media bug. * Ver 1.7 Sep 10 96 Minor changes for the CONNER CTT8000-A model. * Ver 1.8 Sep 26 96 Attempt to find a better balance between good * interactive response and high system throughput. * Ver 1.9 Nov 5 96 Automatically cross encountered filemarks rather * than requiring an explicit FSF command. * Abort pending requests at end of media. * MTTELL was sometimes returning incorrect results. * Return the real block size in the MTIOCGET ioctl. * Some error recovery bug fixes. * Ver 1.10 Nov 5 96 Major reorganization. * Reduced CPU overhead a bit by eliminating internal * bounce buffers. * Added module support. * Added multiple tape drives support. * Added partition support. * Rewrote DSC handling. * Some portability fixes. * Removed ide-tape.h. * Additional minor changes. * Ver 1.11 Dec 2 96 Bug fix in previous DSC timeout handling. * Use ide_stall_queue() for DSC overlap. * Use the maximum speed rather than the current speed * to compute the request service time. * Ver 1.12 Dec 7 97 Fix random memory overwriting and/or last block data * corruption, which could occur if the total number * of bytes written to the tape was not an integral * number of tape blocks. * Add support for INTERRUPT DRQ devices. * Ver 1.13 Jan 2 98 Add "speed == 0" work-around for HP COLORADO 5GB * Ver 1.14 Dec 30 98 Partial fixes for the Sony/AIWA tape drives. * Replace cli()/sti() with hwgroup spinlocks. * Ver 1.15 Mar 25 99 Fix SMP race condition by replacing hwgroup * spinlock with private per-tape spinlock. * Ver 1.16 Sep 1 99 Add OnStream tape support. * Abort read pipeline on EOD. * Wait for the tape to become ready in case it returns * "in the process of becoming ready" on open(). * Fix zero padding of the last written block in * case the tape block size is larger than PAGE_SIZE. * Decrease the default disconnection time to tn. * Ver 1.16e Oct 3 99 Minor fixes. * Ver 1.16e1 Oct 13 99 Patches by Arnold Niessen, * niessen@iae.nl / arnold.niessen@philips.com * GO-1) Undefined code in idetape_read_position * according to Gadi's email * AJN-1) Minor fix asc == 11 should be asc == 0x11 * in idetape_issue_packet_command (did effect * debugging output only) * AJN-2) Added more debugging output, and * added ide-tape: where missing. I would also * like to add tape->name where possible * AJN-3) Added different debug_level's * via /proc/ide/hdc/settings * "debug_level" determines amount of debugging output; * can be changed using /proc/ide/hdx/settings * 0 : almost no debugging output * 1 : 0+output errors only * 2 : 1+output all sensekey/asc * 3 : 2+follow all chrdev related procedures * 4 : 3+follow all procedures * 5 : 4+include pc_stack rq_stack info * 6 : 5+USE_COUNT updates * AJN-4) Fixed timeout for retension in idetape_queue_pc_tail * from 5 to 10 minutes * AJN-5) Changed maximum number of blocks to skip when * reading tapes with multiple consecutive write * errors from 100 to 1000 in idetape_get_logical_blk * Proposed changes to code: * 1) output "logical_blk_num" via /proc * 2) output "current_operation" via /proc * 3) Either solve or document the fact that `mt rewind' is * required after reading from /dev/nhtx to be * able to rmmod the idetape module; * Also, sometimes an application finishes but the * device remains `busy' for some time. Same cause ? * Proposed changes to release-notes: * 4) write a simple `quickstart' section in the * release notes; I volunteer if you don't want to * 5) include a pointer to video4linux in the doc * to stimulate video applications * 6) release notes lines 331 and 362: explain what happens * if the application data rate is higher than 1100 KB/s; * similar approach to lower-than-500 kB/s ? * 7) 6.6 Comparison; wouldn't it be better to allow different * strategies for read and write ? * Wouldn't it be better to control the tape buffer * contents instead of the bandwidth ? * 8) line 536: replace will by would (if I understand * this section correctly, a hypothetical and unwanted situation * is being described) * Ver 1.16f Dec 15 99 Change place of the secondary OnStream header frames. * * * Here are some words from the first releases of hd.c, which are quoted * in ide.c and apply here as well: * * | Special care is recommended. Have Fun! * */ /* * An overview of the pipelined operation mode. * * In the pipelined write mode, we will usually just add requests to our * pipeline and return immediately, before we even start to service them. The * user program will then have enough time to prepare the next request while * we are still busy servicing previous requests. In the pipelined read mode, * the situation is similar - we add read-ahead requests into the pipeline, * before the user even requested them. * * The pipeline can be viewed as a "safety net" which will be activated when * the system load is high and prevents the user backup program from keeping up * with the current tape speed. At this point, the pipeline will get * shorter and shorter but the tape will still be streaming at the same speed. * Assuming we have enough pipeline stages, the system load will hopefully * decrease before the pipeline is completely empty, and the backup program * will be able to "catch up" and refill the pipeline again. * * When using the pipelined mode, it would be best to disable any type of * buffering done by the user program, as ide-tape already provides all the * benefits in the kernel, where it can be done in a more efficient way. * As we will usually not block the user program on a request, the most * efficient user code will then be a simple read-write-read-... cycle. * Any additional logic will usually just slow down the backup process. * * Using the pipelined mode, I get a constant over 400 KBps throughput, * which seems to be the maximum throughput supported by my tape. * * However, there are some downfalls: * * 1. We use memory (for data buffers) in proportional to the number * of pipeline stages (each stage is about 26 KB with my tape). * 2. In the pipelined write mode, we cheat and postpone error codes * to the user task. In read mode, the actual tape position * will be a bit further than the last requested block. * * Concerning (1): * * 1. We allocate stages dynamically only when we need them. When * we don't need them, we don't consume additional memory. In * case we can't allocate stages, we just manage without them * (at the expense of decreased throughput) so when Linux is * tight in memory, we will not pose additional difficulties. * * 2. The maximum number of stages (which is, in fact, the maximum * amount of memory) which we allocate is limited by the compile * time parameter IDETAPE_MAX_PIPELINE_STAGES. * * 3. The maximum number of stages is a controlled parameter - We * don't start from the user defined maximum number of stages * but from the lower IDETAPE_MIN_PIPELINE_STAGES (again, we * will not even allocate this amount of stages if the user * program can't handle the speed). We then implement a feedback * loop which checks if the pipeline is empty, and if it is, we * increase the maximum number of stages as necessary until we * reach the optimum value which just manages to keep the tape * busy with minimum allocated memory or until we reach * IDETAPE_MAX_PIPELINE_STAGES. * * Concerning (2): * * In pipelined write mode, ide-tape can not return accurate error codes * to the user program since we usually just add the request to the * pipeline without waiting for it to be serviced. In case an error * occurs, I will report it on the next user request. * * In the pipelined read mode, subsequent read requests or forward * filemark spacing will perform correctly, as we preserve all blocks * and filemarks which we encountered during our excess read-ahead. * * For accurate tape positioning and error reporting, disabling * pipelined mode might be the best option. * * You can enable/disable/tune the pipelined operation mode by adjusting * the compile time parameters below. */ /* * Possible improvements. * * 1. Support for the ATAPI overlap protocol. * * In order to maximize bus throughput, we currently use the DSC * overlap method which enables ide.c to service requests from the * other device while the tape is busy executing a command. The * DSC overlap method involves polling the tape's status register * for the DSC bit, and servicing the other device while the tape * isn't ready. * * In the current QIC development standard (December 1995), * it is recommended that new tape drives will *in addition* * implement the ATAPI overlap protocol, which is used for the * same purpose - efficient use of the IDE bus, but is interrupt * driven and thus has much less CPU overhead. * * ATAPI overlap is likely to be supported in most new ATAPI * devices, including new ATAPI cdroms, and thus provides us * a method by which we can achieve higher throughput when * sharing a (fast) ATA-2 disk with any (slow) new ATAPI device. */ #define IDETAPE_VERSION "1.16f" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define NO_LONGER_REQUIRED (1) /* * OnStream support */ #define ONSTREAM_DEBUG (0) #define OS_CONFIG_PARTITION (0xff) #define OS_DATA_PARTITION (0) #define OS_PARTITION_VERSION (1) /* * partition */ typedef struct os_partition_s { __u8 partition_num; __u8 par_desc_ver; __u16 wrt_pass_cntr; __u32 first_frame_addr; __u32 last_frame_addr; __u32 eod_frame_addr; } os_partition_t; /* * DAT entry */ typedef struct os_dat_entry_s { __u32 blk_sz; __u16 blk_cnt; __u8 flags; __u8 reserved; } os_dat_entry_t; /* * DAT */ #define OS_DAT_FLAGS_DATA (0xc) #define OS_DAT_FLAGS_MARK (0x1) typedef struct os_dat_s { __u8 dat_sz; __u8 reserved1; __u8 entry_cnt; __u8 reserved3; os_dat_entry_t dat_list[16]; } os_dat_t; /* * Frame types */ #define OS_FRAME_TYPE_FILL (0) #define OS_FRAME_TYPE_EOD (1 << 0) #define OS_FRAME_TYPE_MARKER (1 << 1) #define OS_FRAME_TYPE_HEADER (1 << 3) #define OS_FRAME_TYPE_DATA (1 << 7) /* * AUX */ typedef struct os_aux_s { __u32 format_id; /* hardware compability AUX is based on */ char application_sig[4]; /* driver used to write this media */ __u32 hdwr; /* reserved */ __u32 update_frame_cntr; /* for configuration frame */ __u8 frame_type; __u8 frame_type_reserved; __u8 reserved_18_19[2]; os_partition_t partition; __u8 reserved_36_43[8]; __u32 frame_seq_num; __u32 logical_blk_num_high; __u32 logical_blk_num; os_dat_t dat; __u8 reserved188_191[4]; __u32 filemark_cnt; __u32 phys_fm; __u32 last_mark_addr; __u8 reserved204_223[20]; /* * __u8 app_specific[32]; * * Linux specific fields: */ __u32 next_mark_addr; /* when known, points to next marker */ __u8 linux_specific[28]; __u8 reserved_256_511[256]; } os_aux_t; typedef struct os_header_s { char ident_str[8]; __u8 major_rev; __u8 minor_rev; __u8 reserved10_15[6]; __u8 par_num; __u8 reserved1_3[3]; os_partition_t partition; } os_header_t; /* * OnStream ADRL frame */ #define OS_FRAME_SIZE (32 * 1024 + 512) #define OS_DATA_SIZE (32 * 1024) #define OS_AUX_SIZE (512) #include /**************************** Tunable parameters *****************************/ /* * Pipelined mode parameters. * * We try to use the minimum number of stages which is enough to * keep the tape constantly streaming. To accomplish that, we implement * a feedback loop around the maximum number of stages: * * We start from MIN maximum stages (we will not even use MIN stages * if we don't need them), increment it by RATE*(MAX-MIN) * whenever we sense that the pipeline is empty, until we reach * the optimum value or until we reach MAX. * * Setting the following parameter to 0 will disable the pipelined mode. */ #define IDETAPE_MIN_PIPELINE_STAGES 200 #define IDETAPE_MAX_PIPELINE_STAGES 400 #define IDETAPE_INCREASE_STAGES_RATE 20 /* * The following are used to debug the driver: * * Setting IDETAPE_DEBUG_INFO to 1 will report device capabilities. * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control. * Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in * some places. * * Setting them to 0 will restore normal operation mode: * * 1. Disable logging normal successful operations. * 2. Disable self-sanity checks. * 3. Errors will still be logged, of course. * * All the #if DEBUG code will be removed some day, when the driver * is verified to be stable enough. This will make it much more * esthetic. */ #define IDETAPE_DEBUG_INFO 0 #define IDETAPE_DEBUG_LOG 1 #define IDETAPE_DEBUG_LOG_VERBOSE 0 #define IDETAPE_DEBUG_BUGS 1 /* * After each failed packet command we issue a request sense command * and retry the packet command IDETAPE_MAX_PC_RETRIES times. * * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. */ #define IDETAPE_MAX_PC_RETRIES 3 /* * With each packet command, we allocate a buffer of * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet * commands (Not for READ/WRITE commands). */ #define IDETAPE_PC_BUFFER_SIZE 256 /* * In various places in the driver, we need to allocate storage * for packet commands and requests, which will remain valid while * we leave the driver to wait for an interrupt or a timeout event. */ #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) /* * Some tape drives require a long irq timeout */ #define IDETAPE_WAIT_CMD (60*HZ) /* * The following parameter is used to select the point in the internal * tape fifo in which we will start to refill the buffer. Decreasing * the following parameter will improve the system's latency and * interactive response, while using a high value might improve sytem * throughput. */ #define IDETAPE_FIFO_THRESHOLD 2 /* * DSC polling parameters. * * Polling for DSC (a single bit in the status register) is a very * important function in ide-tape. There are two cases in which we * poll for DSC: * * 1. Before a read/write packet command, to ensure that we * can transfer data from/to the tape's data buffers, without * causing an actual media access. In case the tape is not * ready yet, we take out our request from the device * request queue, so that ide.c will service requests from * the other device on the same interface meanwhile. * * 2. After the successful initialization of a "media access * packet command", which is a command which can take a long * time to complete (it can be several seconds or even an hour). * * Again, we postpone our request in the middle to free the bus * for the other device. The polling frequency here should be * lower than the read/write frequency since those media access * commands are slow. We start from a "fast" frequency - * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute). * * We also set a timeout for the timer, in case something goes wrong. * The timeout should be longer then the maximum execution time of a * tape operation. */ /* * DSC timings. */ #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ /*************************** End of tunable parameters ***********************/ /* * Debugging/Performance analysis * * I/O trace support */ #define USE_IOTRACE 0 #if USE_IOTRACE #include #define IO_IDETAPE_FIFO 500 #endif /* * Read/Write error simulation */ #define SIMULATE_ERRORS 0 /* * For general magnetic tape device compatibility. */ typedef enum { idetape_direction_none, idetape_direction_read, idetape_direction_write } idetape_chrdev_direction_t; /* * Our view of a packet command. */ typedef struct idetape_packet_command_s { u8 c[12]; /* Actual packet bytes */ int retries; /* On each retry, we increment retries */ int error; /* Error code */ int request_transfer; /* Bytes to transfer */ int actually_transferred; /* Bytes actually transferred */ int buffer_size; /* Size of our data buffer */ struct buffer_head *bh; char *b_data; int b_count; byte *buffer; /* Data buffer */ byte *current_position; /* Pointer into the above buffer */ ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */ byte pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */ unsigned long flags; /* Status/Action bit flags: long for set_bit */ } idetape_pc_t; /* * Packet command flag bits. */ #define PC_ABORT 0 /* Set when an error is considered normal - We won't retry */ #define PC_WAIT_FOR_DSC 1 /* 1 When polling for DSC on a media access command */ #define PC_DMA_RECOMMENDED 2 /* 1 when we prefer to use DMA if possible */ #define PC_DMA_IN_PROGRESS 3 /* 1 while DMA in progress */ #define PC_DMA_ERROR 4 /* 1 when encountered problem during DMA */ #define PC_WRITING 5 /* Data direction */ /* * Capabilities and Mechanical Status Page */ typedef struct { unsigned page_code :6; /* Page code - Should be 0x2a */ __u8 reserved0_6 :1; __u8 ps :1; /* parameters saveable */ __u8 page_length; /* Page Length - Should be 0x12 */ __u8 reserved2, reserved3; unsigned ro :1; /* Read Only Mode */ unsigned reserved4_1234 :4; unsigned sprev :1; /* Supports SPACE in the reverse direction */ unsigned reserved4_67 :2; unsigned reserved5_012 :3; unsigned efmt :1; /* Supports ERASE command initiated formatting */ unsigned reserved5_4 :1; unsigned qfa :1; /* Supports the QFA two partition formats */ unsigned reserved5_67 :2; unsigned lock :1; /* Supports locking the volume */ unsigned locked :1; /* The volume is locked */ unsigned prevent :1; /* The device defaults in the prevent state after power up */ unsigned eject :1; /* The device can eject the volume */ __u8 disconnect :1; /* The device can break request > ctl */ __u8 reserved6_5 :1; unsigned ecc :1; /* Supports error correction */ unsigned cmprs :1; /* Supports data compression */ unsigned reserved7_0 :1; unsigned blk512 :1; /* Supports 512 bytes block size */ unsigned blk1024 :1; /* Supports 1024 bytes block size */ unsigned reserved7_3_6 :4; unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */ /* transfers for slow buffer memory ??? */ /* Also 32768 block size in some cases */ __u16 max_speed; /* Maximum speed supported in KBps */ __u8 reserved10, reserved11; __u16 ctl; /* Continuous Transfer Limit in blocks */ __u16 speed; /* Current Speed, in KBps */ __u16 buffer_size; /* Buffer Size, in 512 bytes */ __u8 reserved18, reserved19; } idetape_capabilities_page_t; /* * Block Size Page */ typedef struct { unsigned page_code :6; /* Page code - Should be 0x30 */ unsigned reserved1_6 :1; unsigned ps :1; __u8 page_length; /* Page Length - Should be 2 */ __u8 reserved2; unsigned play32 :1; unsigned play32_5 :1; unsigned reserved2_23 :2; unsigned record32 :1; unsigned record32_5 :1; unsigned reserved2_6 :1; unsigned one :1; } idetape_block_size_page_t; /* * A pipeline stage. */ typedef struct idetape_stage_s { struct request rq; /* The corresponding request */ struct buffer_head *bh; /* The data buffers */ struct idetape_stage_s *next; /* Pointer to the next stage */ os_aux_t *aux; /* OnStream aux ptr */ } idetape_stage_t; /* * REQUEST SENSE packet command result - Data Format. */ typedef struct { unsigned error_code :7; /* Current of deferred errors */ unsigned valid :1; /* The information field conforms to QIC-157C */ __u8 reserved1 :8; /* Segment Number - Reserved */ unsigned sense_key :4; /* Sense Key */ unsigned reserved2_4 :1; /* Reserved */ unsigned ili :1; /* Incorrect Length Indicator */ unsigned eom :1; /* End Of Medium */ unsigned filemark :1; /* Filemark */ __u32 information __attribute__ ((packed)); __u8 asl; /* Additional sense length (n-7) */ __u32 command_specific; /* Additional command specific information */ __u8 asc; /* Additional Sense Code */ __u8 ascq; /* Additional Sense Code Qualifier */ __u8 replaceable_unit_code; /* Field Replaceable Unit Code */ unsigned sk_specific1 :7; /* Sense Key Specific */ unsigned sksv :1; /* Sense Key Specific information is valid */ __u8 sk_specific2; /* Sense Key Specific */ __u8 sk_specific3; /* Sense Key Specific */ __u8 pad[2]; /* Padding to 20 bytes */ } idetape_request_sense_result_t; /* * Most of our global data which we need to save even as we leave the * driver due to an interrupt or a timer event is stored in a variable * of type idetape_tape_t, defined below. */ typedef struct { ide_drive_t *drive; devfs_handle_t de_r, de_n; /* * Since a typical character device operation requires more * than one packet command, we provide here enough memory * for the maximum of interconnected packet commands. * The packet commands are stored in the circular array pc_stack. * pc_stack_index points to the last used entry, and warps around * to the start when we get to the last array entry. * * pc points to the current processed packet command. * * failed_pc points to the last failed packet command, or contains * NULL if we do not need to retry any packet command. This is * required since an additional packet command is needed before the * retry, to get detailed information on what went wrong. */ idetape_pc_t *pc; /* Current packet command */ idetape_pc_t *failed_pc; /* Last failed packet command */ idetape_pc_t pc_stack[IDETAPE_PC_STACK];/* Packet command stack */ int pc_stack_index; /* Next free packet command storage space */ struct request rq_stack[IDETAPE_PC_STACK]; int rq_stack_index; /* We implement a circular array */ /* * DSC polling variables. * * While polling for DSC we use postponed_rq to postpone the * current request so that ide.c will be able to service * pending requests on the other device. Note that at most * we will have only one DSC (usually data transfer) request * in the device request queue. Additional requests can be * queued in our internal pipeline, but they will be visible * to ide.c only one at a time. */ struct request *postponed_rq; unsigned long dsc_polling_start; /* The time in which we started polling for DSC */ struct timer_list dsc_timer; /* Timer used to poll for dsc */ unsigned long best_dsc_rw_frequency; /* Read/Write dsc polling frequency */ unsigned long dsc_polling_frequency; /* The current polling frequency */ unsigned long dsc_timeout; /* Maximum waiting time */ /* * Read position information */ byte partition; unsigned int first_frame_position; /* Current block */ unsigned int last_frame_position; unsigned int blocks_in_buffer; /* * Last error information */ byte sense_key, asc, ascq; /* * Character device operation */ unsigned int minor; char name[4]; /* device name */ idetape_chrdev_direction_t chrdev_direction; /* Current character device data transfer direction */ /* * Device information */ unsigned short tape_block_size; /* Usually 512 or 1024 bytes */ int user_bs_factor; idetape_capabilities_page_t capabilities; /* Copy of the tape's Capabilities and Mechanical Page */ /* * Active data transfer request parameters. * * At most, there is only one ide-tape originated data transfer * request in the device request queue. This allows ide.c to * easily service requests from the other device when we * postpone our active request. In the pipelined operation * mode, we use our internal pipeline structure to hold * more data requests. * * The data buffer size is chosen based on the tape's * recommendation. */ struct request *active_data_request; /* Pointer to the request which is waiting in the device request queue */ int stage_size; /* Data buffer size (chosen based on the tape's recommendation */ idetape_stage_t *merge_stage; int merge_stage_size; struct buffer_head *bh; char *b_data; int b_count; /* * Pipeline parameters. * * To accomplish non-pipelined mode, we simply set the following * variables to zero (or NULL, where appropriate). */ int nr_stages; /* Number of currently used stages */ int nr_pending_stages; /* Number of pending stages */ int max_stages, min_pipeline, max_pipeline; /* We will not allocate more than this number of stages */ idetape_stage_t *first_stage; /* The first stage which will be removed from the pipeline */ idetape_stage_t *active_stage; /* The currently active stage */ idetape_stage_t *next_stage; /* Will be serviced after the currently active request */ idetape_stage_t *last_stage; /* New requests will be added to the pipeline here */ idetape_stage_t *cache_stage; /* Optional free stage which we can use */ int pages_per_stage; int excess_bh_size; /* Wasted space in each stage */ unsigned long flags; /* Status/Action flags: long for set_bit */ spinlock_t spinlock; /* protects the ide-tape queue */ /* * Measures average tape speed */ unsigned long avg_time; int avg_size; int avg_speed; idetape_request_sense_result_t sense; /* last sense information */ char vendor_id[10]; char product_id[18]; char firmware_revision[6]; int firmware_revision_num; int door_locked; /* the door is currently locked */ /* * OnStream flags */ int onstream; /* the tape is an OnStream tape */ int raw; /* OnStream raw access (32.5KB block size) */ int cur_frames; /* current number of frames in internal buffer */ int max_frames; /* max number of frames in internal buffer */ int logical_blk_num; /* logical block number */ __u16 wrt_pass_cntr; /* write pass counter */ __u32 update_frame_cntr; /* update frame counter */ struct semaphore *sem; int onstream_write_error; /* write error recovery active */ int header_ok; /* header frame verified ok */ int linux_media; /* reading linux-specifc media */ int linux_media_version; char application_sig[5]; /* application signature */ int filemark_cnt; int first_mark_addr; int last_mark_addr; int eod_frame_addr; unsigned long cmd_start_time; unsigned long max_cmd_time; /* * Optimize the number of "buffer filling" * mode sense commands. */ unsigned long last_buffer_fill; /* last time in which we issued fill cmd */ int req_buffer_fill; /* buffer fill command requested */ int writes_since_buffer_fill; int reads_since_buffer_fill; /* * Limit the number of times a request can * be postponed, to avoid an infinite postpone * deadlock. */ int postpone_cnt; /* request postpone count limit */ /* * Measures number of frames: * * 1. written/read to/from the driver pipeline (pipeline_head). * 2. written/read to/from the tape buffers (buffer_head). * 3. written/read by the tape to/from the media (tape_head). */ int pipeline_head; int buffer_head; int tape_head; int last_tape_head; /* * Speed control at the tape buffers input/output */ unsigned long insert_time; int insert_size; int insert_speed; int max_insert_speed; int measure_insert_time; /* * Measure tape still time, in milliseconds */ unsigned long tape_still_time_begin; int tape_still_time; /* * Speed regulation negative feedback loop */ int speed_control; int pipeline_head_speed, controlled_pipeline_head_speed, uncontrolled_pipeline_head_speed; int controlled_last_pipeline_head, uncontrolled_last_pipeline_head; unsigned long uncontrolled_pipeline_head_time, controlled_pipeline_head_time; int controlled_previous_pipeline_head, uncontrolled_previous_pipeline_head; unsigned long controlled_previous_head_time, uncontrolled_previous_head_time; int restart_speed_control_req; /* * Debug_level determines amount of debugging output; * can be changed using /proc/ide/hdx/settings * 0 : almost no debugging output * 1 : 0+output errors only * 2 : 1+output all sensekey/asc * 3 : 2+follow all chrdev related procedures * 4 : 3+follow all procedures * 5 : 4+include pc_stack rq_stack info * 6 : 5+USE_COUNT updates */ int debug_level; } idetape_tape_t; /* * Tape door status */ #define DOOR_UNLOCKED 0 #define DOOR_LOCKED 1 #define DOOR_EXPLICITLY_LOCKED 2 /* * Tape flag bits values. */ #define IDETAPE_IGNORE_DSC 0 #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */ #define IDETAPE_BUSY 2 /* Device already opened */ #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */ #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */ #define IDETAPE_FILEMARK 5 /* Currently on a filemark */ #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */ #define IDETAPE_READ_ERROR 7 #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */ /* * Supported ATAPI tape drives packet commands */ #define IDETAPE_TEST_UNIT_READY_CMD 0x00 #define IDETAPE_REWIND_CMD 0x01 #define IDETAPE_REQUEST_SENSE_CMD 0x03 #define IDETAPE_READ_CMD 0x08 #define IDETAPE_WRITE_CMD 0x0a #define IDETAPE_WRITE_FILEMARK_CMD 0x10 #define IDETAPE_SPACE_CMD 0x11 #define IDETAPE_INQUIRY_CMD 0x12 #define IDETAPE_ERASE_CMD 0x19 #define IDETAPE_MODE_SENSE_CMD 0x1a #define IDETAPE_MODE_SELECT_CMD 0x15 #define IDETAPE_LOAD_UNLOAD_CMD 0x1b #define IDETAPE_PREVENT_CMD 0x1e #define IDETAPE_LOCATE_CMD 0x2b #define IDETAPE_READ_POSITION_CMD 0x34 #define IDETAPE_READ_BUFFER_CMD 0x3c #define IDETAPE_SET_SPEED_CMD 0xbb /* * Some defines for the READ BUFFER command */ #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6 /* * Some defines for the SPACE command */ #define IDETAPE_SPACE_OVER_FILEMARK 1 #define IDETAPE_SPACE_TO_EOD 3 /* * Some defines for the LOAD UNLOAD command */ #define IDETAPE_LU_LOAD_MASK 1 #define IDETAPE_LU_RETENSION_MASK 2 #define IDETAPE_LU_EOT_MASK 4 /* * Special requests for our block device strategy routine. * * In order to service a character device command, we add special * requests to the tail of our block device request queue and wait * for their completion. * */ #define IDETAPE_FIRST_RQ 90 /* * IDETAPE_PC_RQ is used to queue a packet command in the request queue. */ #define IDETAPE_PC_RQ1 90 #define IDETAPE_PC_RQ2 91 /* * IDETAPE_READ_RQ and IDETAPE_WRITE_RQ are used by our * character device interface to request read/write operations from * our block device interface. */ #define IDETAPE_READ_RQ 92 #define IDETAPE_WRITE_RQ 93 #define IDETAPE_ABORTED_WRITE_RQ 94 #define IDETAPE_ABORTED_READ_RQ 95 #define IDETAPE_READ_BUFFER_RQ 96 #define IDETAPE_LAST_RQ 96 /* * A macro which can be used to check if a we support a given * request command. */ #define IDETAPE_RQ_CMD(cmd) ((cmd >= IDETAPE_FIRST_RQ) && (cmd <= IDETAPE_LAST_RQ)) /* * Error codes which are returned in rq->errors to the higher part * of the driver. */ #define IDETAPE_ERROR_GENERAL 101 #define IDETAPE_ERROR_FILEMARK 102 #define IDETAPE_ERROR_EOD 103 /* * The ATAPI Status Register. */ typedef union { unsigned all :8; struct { unsigned check :1; /* Error occurred */ unsigned idx :1; /* Reserved */ unsigned corr :1; /* Correctable error occurred */ unsigned drq :1; /* Data is request by the device */ unsigned dsc :1; /* Buffer availability / Media access command finished */ unsigned reserved5 :1; /* Reserved */ unsigned drdy :1; /* Ignored for ATAPI commands (ready to accept ATA command) */ unsigned bsy :1; /* The device has access to the command block */ } b; } idetape_status_reg_t; /* * The ATAPI error register. */ typedef union { unsigned all :8; struct { unsigned ili :1; /* Illegal Length Indication */ unsigned eom :1; /* End Of Media Detected */ unsigned abrt :1; /* Aborted command - As defined by ATA */ unsigned mcr :1; /* Media Change Requested - As defined by ATA */ unsigned sense_key :4; /* Sense key of the last failed packet command */ } b; } idetape_error_reg_t; /* * ATAPI Feature Register */ typedef union { unsigned all :8; struct { unsigned dma :1; /* Using DMA of PIO */ unsigned reserved321 :3; /* Reserved */ unsigned reserved654 :3; /* Reserved (Tag Type) */ unsigned reserved7 :1; /* Reserved */ } b; } idetape_feature_reg_t; /* * ATAPI Byte Count Register. */ typedef union { unsigned all :16; struct { unsigned low :8; /* LSB */ unsigned high :8; /* MSB */ } b; } idetape_bcount_reg_t; /* * ATAPI Interrupt Reason Register. */ typedef union { unsigned all :8; struct { unsigned cod :1; /* Information transferred is command (1) or data (0) */ unsigned io :1; /* The device requests us to read (1) or write (0) */ unsigned reserved :6; /* Reserved */ } b; } idetape_ireason_reg_t; /* * ATAPI Drive Select Register */ typedef union { unsigned all :8; struct { unsigned sam_lun :4; /* Should be zero with ATAPI (not used) */ unsigned drv :1; /* The responding drive will be drive 0 (0) or drive 1 (1) */ unsigned one5 :1; /* Should be set to 1 */ unsigned reserved6 :1; /* Reserved */ unsigned one7 :1; /* Should be set to 1 */ } b; } idetape_drivesel_reg_t; /* * ATAPI Device Control Register */ typedef union { unsigned all :8; struct { unsigned zero0 :1; /* Should be set to zero */ unsigned nien :1; /* Device interrupt is disabled (1) or enabled (0) */ unsigned srst :1; /* ATA software reset. ATAPI devices should use the new ATAPI srst. */ unsigned one3 :1; /* Should be set to 1 */ unsigned reserved4567 :4; /* Reserved */ } b; } idetape_control_reg_t; /* * idetape_chrdev_t provides the link between out character device * interface and our block device interface and the corresponding * ide_drive_t structure. */ typedef struct { ide_drive_t *drive; } idetape_chrdev_t; /* * The following is used to format the general configuration word of * the ATAPI IDENTIFY DEVICE command. */ struct idetape_id_gcw { unsigned packet_size :2; /* Packet Size */ unsigned reserved234 :3; /* Reserved */ unsigned drq_type :2; /* Command packet DRQ type */ unsigned removable :1; /* Removable media */ unsigned device_type :5; /* Device type */ unsigned reserved13 :1; /* Reserved */ unsigned protocol :2; /* Protocol type */ }; /* * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C) */ typedef struct { unsigned device_type :5; /* Peripheral Device Type */ unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */ unsigned reserved1_6t0 :7; /* Reserved */ unsigned rmb :1; /* Removable Medium Bit */ unsigned ansi_version :3; /* ANSI Version */ unsigned ecma_version :3; /* ECMA Version */ unsigned iso_version :2; /* ISO Version */ unsigned response_format :4; /* Response Data Format */ unsigned reserved3_45 :2; /* Reserved */ unsigned reserved3_6 :1; /* TrmIOP - Reserved */ unsigned reserved3_7 :1; /* AENC - Reserved */ __u8 additional_length; /* Additional Length (total_length-4) */ __u8 rsv5, rsv6, rsv7; /* Reserved */ __u8 vendor_id[8]; /* Vendor Identification */ __u8 product_id[16]; /* Product Identification */ __u8 revision_level[4]; /* Revision Level */ __u8 vendor_specific[20]; /* Vendor Specific - Optional */ __u8 reserved56t95[40]; /* Reserved - Optional */ /* Additional information may be returned */ } idetape_inquiry_result_t; /* * READ POSITION packet command - Data Format (From Table 6-57) */ typedef struct { unsigned reserved0_10 :2; /* Reserved */ unsigned bpu :1; /* Block Position Unknown */ unsigned reserved0_543 :3; /* Reserved */ unsigned eop :1; /* End Of Partition */ unsigned bop :1; /* Beginning Of Partition */ u8 partition; /* Partition Number */ u8 reserved2, reserved3; /* Reserved */ u32 first_block; /* First Block Location */ u32 last_block; /* Last Block Location (Optional) */ u8 reserved12; /* Reserved */ u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */ u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */ } idetape_read_position_result_t; /* * Follows structures which are related to the SELECT SENSE / MODE SENSE * packet commands. Those packet commands are still not supported * by ide-tape. */ #define IDETAPE_CAPABILITIES_PAGE 0x2a #define IDETAPE_BLOCK_SIZE_PAGE 0x30 /* * Mode Parameter Header for the MODE SENSE packet command */ typedef struct { __u8 mode_data_length; /* Length of the following data transfer */ __u8 medium_type; /* Medium Type */ __u8 dsp; /* Device Specific Parameter */ __u8 bdl; /* Block Descriptor Length */ #if 0 /* data transfer page */ __u8 page_code :6; __u8 reserved0_6 :1; __u8 ps :1; /* parameters saveable */ __u8 page_length; /* page Length == 0x02 */ __u8 reserved2; __u8 read32k :1; /* 32k blk size (data only) */ __u8 read32k5 :1; /* 32.5k blk size (data&AUX) */ __u8 reserved3_23 :2; __u8 write32k :1; /* 32k blk size (data only) */ __u8 write32k5 :1; /* 32.5k blk size (data&AUX) */ __u8 reserved3_6 :1; __u8 streaming :1; /* streaming mode enable */ #endif } idetape_mode_parameter_header_t; /* * Mode Parameter Block Descriptor the MODE SENSE packet command * * Support for block descriptors is optional. */ typedef struct { __u8 density_code; /* Medium density code */ __u8 blocks[3]; /* Number of blocks */ __u8 reserved4; /* Reserved */ __u8 length[3]; /* Block Length */ } idetape_parameter_block_descriptor_t; /* * The Data Compression Page, as returned by the MODE SENSE packet command. */ typedef struct { unsigned page_code :6; /* Page Code - Should be 0xf */ unsigned reserved0 :1; /* Reserved */ unsigned ps :1; __u8 page_length; /* Page Length - Should be 14 */ unsigned reserved2 :6; /* Reserved */ unsigned dcc :1; /* Data Compression Capable */ unsigned dce :1; /* Data Compression Enable */ unsigned reserved3 :5; /* Reserved */ unsigned red :2; /* Report Exception on Decompression */ unsigned dde :1; /* Data Decompression Enable */ __u32 ca; /* Compression Algorithm */ __u32 da; /* Decompression Algorithm */ __u8 reserved[4]; /* Reserved */ } idetape_data_compression_page_t; /* * The Medium Partition Page, as returned by the MODE SENSE packet command. */ typedef struct { unsigned page_code :6; /* Page Code - Should be 0x11 */ unsigned reserved1_6 :1; /* Reserved */ unsigned ps :1; __u8 page_length; /* Page Length - Should be 6 */ __u8 map; /* Maximum Additional Partitions - Should be 0 */ __u8 apd; /* Additional Partitions Defined - Should be 0 */ unsigned reserved4_012 :3; /* Reserved */ unsigned psum :2; /* Should be 0 */ unsigned idp :1; /* Should be 0 */ unsigned sdp :1; /* Should be 0 */ unsigned fdp :1; /* Fixed Data Partitions */ __u8 mfr; /* Medium Format Recognition */ __u8 reserved[2]; /* Reserved */ } idetape_medium_partition_page_t; /* * Run time configurable parameters. */ typedef struct { int dsc_rw_frequency; int dsc_media_access_frequency; int nr_stages; } idetape_config_t; /* * The variables below are used for the character device interface. * Additional state variables are defined in our ide_drive_t structure. */ static idetape_chrdev_t idetape_chrdevs[MAX_HWIFS * MAX_DRIVES]; static int idetape_chrdev_present = 0; #if IDETAPE_DEBUG_LOG_VERBOSE /* * DO NOT REMOVE, BUILDING A VERBOSE DEBUG SCHEME FOR ATAPI */ char *idetape_sense_key_verbose (byte idetape_sense_key) { switch (idetape_sense_key) { default: { char buf[22]; sprintf(buf, "IDETAPE_SENSE (0x%02x)", idetape_sense_key); return(buf); } } } char *idetape_command_key_verbose (byte idetape_command_key) { switch (idetape_command_key) { case IDETAPE_TEST_UNIT_READY_CMD: return("TEST_UNIT_READY_CMD"); case IDETAPE_REWIND_CMD: return("REWIND_CMD"); case IDETAPE_REQUEST_SENSE_CMD: return("REQUEST_SENSE_CMD"); case IDETAPE_READ_CMD: return("READ_CMD"); case IDETAPE_WRITE_CMD: return("WRITE_CMD"); case IDETAPE_WRITE_FILEMARK_CMD: return("WRITE_FILEMARK_CMD"); case IDETAPE_SPACE_CMD: return("SPACE_CMD"); case IDETAPE_INQUIRY_CMD: return("INQUIRY_CMD"); case IDETAPE_ERASE_CMD: return("ERASE_CMD") case IDETAPE_MODE_SENSE_CMD: return("MODE_SENSE_CMD"); case IDETAPE_MODE_SELECT_CMD: return("MODE_SELECT_CMD"); case IDETAPE_LOAD_UNLOAD_CMD: return("LOAD_UNLOAD_CMD"); case IDETAPE_PREVENT_CMD: return("PREVENT_CMD"); case IDETAPE_LOCATE_CMD: return("LOCATE_CMD"); case IDETAPE_READ_POSITION_CMD: return("READ_POSITION_CMD"); case IDETAPE_READ_BUFFER_CMD: return("READ_BUFFER_CMD"); case IDETAPE_SET_SPEED_CMD: return("SET_SPEED_CMD"); default: { char buf[20]; sprintf(buf, "CMD (0x%02x)", idetape_command_key); return(buf); } } } #endif /* IDETAPE_DEBUG_LOG_VERBOSE */ /* * Too bad. The drive wants to send us data which we are not ready to accept. * Just throw it away. */ static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount) { while (bcount--) IN_BYTE (IDE_DATA_REG); } static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) { struct buffer_head *bh = pc->bh; int count; while (bcount) { #if IDETAPE_DEBUG_BUGS if (bh == NULL) { printk (KERN_ERR "ide-tape: bh == NULL in idetape_input_buffers\n"); idetape_discard_data (drive, bcount); return; } #endif /* IDETAPE_DEBUG_BUGS */ count = IDE_MIN (bh->b_size - atomic_read(&bh->b_count), bcount); atapi_input_bytes (drive, bh->b_data + atomic_read(&bh->b_count), count); bcount -= count; atomic_add(count, &bh->b_count); if (atomic_read(&bh->b_count) == bh->b_size) { bh = bh->b_reqnext; if (bh) atomic_set(&bh->b_count, 0); } } pc->bh = bh; } static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) { struct buffer_head *bh = pc->bh; int count; while (bcount) { #if IDETAPE_DEBUG_BUGS if (bh == NULL) { printk (KERN_ERR "ide-tape: bh == NULL in idetape_output_buffers\n"); return; } #endif /* IDETAPE_DEBUG_BUGS */ count = IDE_MIN (pc->b_count, bcount); atapi_output_bytes (drive, pc->b_data, count); bcount -= count; pc->b_data += count; pc->b_count -= count; if (!pc->b_count) { pc->bh = bh = bh->b_reqnext; if (bh) { pc->b_data = bh->b_data; pc->b_count = atomic_read(&bh->b_count); } } } } #ifdef CONFIG_BLK_DEV_IDEDMA static void idetape_update_buffers (idetape_pc_t *pc) { struct buffer_head *bh = pc->bh; int count, bcount = pc->actually_transferred; if (test_bit (PC_WRITING, &pc->flags)) return; while (bcount) { #if IDETAPE_DEBUG_BUGS if (bh == NULL) { printk (KERN_ERR "ide-tape: bh == NULL in idetape_update_buffers\n"); return; } #endif /* IDETAPE_DEBUG_BUGS */ count = IDE_MIN (bh->b_size, bcount); atomic_set(&bh->b_count, count); if (atomic_read(&bh->b_count) == bh->b_size) bh = bh->b_reqnext; bcount -= count; } pc->bh = bh; } #endif /* CONFIG_BLK_DEV_IDEDMA */ /* * idetape_next_pc_storage returns a pointer to a place in which we can * safely store a packet command, even though we intend to leave the * driver. A storage space for a maximum of IDETAPE_PC_STACK packet * commands is allocated at initialization time. */ static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 5) printk (KERN_INFO "ide-tape: pc_stack_index=%d\n",tape->pc_stack_index); #endif /* IDETAPE_DEBUG_LOG */ if (tape->pc_stack_index==IDETAPE_PC_STACK) tape->pc_stack_index=0; return (&tape->pc_stack[tape->pc_stack_index++]); } /* * idetape_next_rq_storage is used along with idetape_next_pc_storage. * Since we queue packet commands in the request queue, we need to * allocate a request, along with the allocation of a packet command. */ /************************************************************** * * * This should get fixed to use kmalloc(.., GFP_ATOMIC) * * followed later on by kfree(). -ml * * * **************************************************************/ static struct request *idetape_next_rq_storage (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 5) printk (KERN_INFO "ide-tape: rq_stack_index=%d\n",tape->rq_stack_index); #endif /* IDETAPE_DEBUG_LOG */ if (tape->rq_stack_index==IDETAPE_PC_STACK) tape->rq_stack_index=0; return (&tape->rq_stack[tape->rq_stack_index++]); } /* * idetape_init_pc initializes a packet command. */ static void idetape_init_pc (idetape_pc_t *pc) { memset (pc->c, 0, 12); pc->retries = 0; pc->flags = 0; pc->request_transfer = 0; pc->buffer = pc->pc_buffer; pc->buffer_size = IDETAPE_PC_BUFFER_SIZE; pc->bh = NULL; pc->b_data = NULL; } /* * idetape_analyze_error is called on each failed packet command retry * to analyze the request sense. We currently do not utilize this * information. */ static void idetape_analyze_error (ide_drive_t *drive,idetape_request_sense_result_t *result) { idetape_tape_t *tape = drive->driver_data; idetape_pc_t *pc = tape->failed_pc; tape->sense = *result; tape->sense_key = result->sense_key; tape->asc = result->asc; tape->ascq = result->ascq; #if IDETAPE_DEBUG_LOG /* * Without debugging, we only log an error if we decided to * give up retrying. */ if (tape->debug_level >= 1) printk (KERN_INFO "ide-tape: pc = %x, sense key = %x, asc = %x, ascq = %x\n",pc->c[0],result->sense_key,result->asc,result->ascq); #if IDETAPE_DEBUG_LOG_VERBOSE if (tape->debug_level >= 1) printk (KERN_INFO "ide-tape: pc = %s, sense key = %x, asc = %x, ascq = %x\n", idetape_command_key_verbose((byte) pc->c[0]), result->sense_key, result->asc, result->ascq); #endif /* IDETAPE_DEBUG_LOG_VERBOSE */ #endif /* IDETAPE_DEBUG_LOG */ if (tape->onstream && result->sense_key == 2 && result->asc == 0x53 && result->ascq == 2) { clear_bit(PC_DMA_ERROR, &pc->flags); ide_stall_queue(drive, HZ / 2); return; } #ifdef CONFIG_BLK_DEV_IDEDMA /* * Correct pc->actually_transferred by asking the tape. */ if (test_bit (PC_DMA_ERROR, &pc->flags)) { pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl (get_unaligned (&result->information)); idetape_update_buffers (pc); } #endif /* CONFIG_BLK_DEV_IDEDMA */ if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) { pc->error = IDETAPE_ERROR_FILEMARK; set_bit (PC_ABORT, &pc->flags); } if (pc->c[0] == IDETAPE_WRITE_CMD) { if (result->eom || (result->sense_key == 0xd && result->asc == 0x0 && result->ascq == 0x2)) { pc->error = IDETAPE_ERROR_EOD; set_bit (PC_ABORT, &pc->flags); } } if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) { if (result->sense_key == 8) { pc->error = IDETAPE_ERROR_EOD; set_bit (PC_ABORT, &pc->flags); } if (!test_bit (PC_ABORT, &pc->flags) && (tape->onstream || pc->actually_transferred)) pc->retries = IDETAPE_MAX_PC_RETRIES + 1; } } static void idetape_abort_pipeline (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; idetape_stage_t *stage = tape->next_stage; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name); #endif while (stage) { if (stage->rq.cmd == IDETAPE_WRITE_RQ) stage->rq.cmd = IDETAPE_ABORTED_WRITE_RQ; else if (stage->rq.cmd == IDETAPE_READ_RQ) stage->rq.cmd = IDETAPE_ABORTED_READ_RQ; stage = stage->next; } } /* * idetape_active_next_stage will declare the next stage as "active". */ static void idetape_active_next_stage (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; idetape_stage_t *stage=tape->next_stage; struct request *rq = &stage->rq; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: Reached idetape_active_next_stage\n"); #endif /* IDETAPE_DEBUG_LOG */ #if IDETAPE_DEBUG_BUGS if (stage == NULL) { printk (KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n"); return; } #endif /* IDETAPE_DEBUG_BUGS */ rq->buffer = NULL; rq->bh = stage->bh; tape->active_data_request=rq; tape->active_stage=stage; tape->next_stage=stage->next; } /* * idetape_increase_max_pipeline_stages is a part of the feedback * loop which tries to find the optimum number of stages. In the * feedback loop, we are starting from a minimum maximum number of * stages, and if we sense that the pipeline is empty, we try to * increase it, until we reach the user compile time memory limit. */ static void idetape_increase_max_pipeline_stages (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; int increase = (tape->max_pipeline - tape->min_pipeline) / 10; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n"); #endif /* IDETAPE_DEBUG_LOG */ tape->max_stages += increase; tape->max_stages = IDE_MAX(tape->max_stages, tape->min_pipeline); tape->max_stages = IDE_MIN(tape->max_stages, tape->max_pipeline); } /* * idetape_kfree_stage calls kfree to completely free a stage, along with * its related buffers. */ static void __idetape_kfree_stage (idetape_stage_t *stage) { struct buffer_head *prev_bh, *bh = stage->bh; int size; while (bh != NULL) { if (bh->b_data != NULL) { size = (int) bh->b_size; while (size > 0) { free_page ((unsigned long) bh->b_data); size -= PAGE_SIZE; bh->b_data += PAGE_SIZE; } } prev_bh = bh; bh = bh->b_reqnext; kfree (prev_bh); } kfree (stage); } static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage) { __idetape_kfree_stage (stage); } /* * idetape_remove_stage_head removes tape->first_stage from the pipeline. * The caller should avoid race conditions. */ static void idetape_remove_stage_head (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; idetape_stage_t *stage; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n"); #endif /* IDETAPE_DEBUG_LOG */ #if IDETAPE_DEBUG_BUGS if (tape->first_stage == NULL) { printk (KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n"); return; } if (tape->active_stage == tape->first_stage) { printk (KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n"); return; } #endif /* IDETAPE_DEBUG_BUGS */ stage=tape->first_stage; tape->first_stage=stage->next; idetape_kfree_stage (tape, stage); tape->nr_stages--; if (tape->first_stage == NULL) { tape->last_stage=NULL; #if IDETAPE_DEBUG_BUGS if (tape->next_stage != NULL) printk (KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n"); if (tape->nr_stages) printk (KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n"); #endif /* IDETAPE_DEBUG_BUGS */ } } /* * idetape_end_request is used to finish servicing a request, and to * insert a pending pipeline request into the main device queue. */ static void idetape_end_request (byte uptodate, ide_hwgroup_t *hwgroup) { ide_drive_t *drive = hwgroup->drive; struct request *rq = hwgroup->rq; idetape_tape_t *tape = drive->driver_data; unsigned long flags; int error; int remove_stage = 0; #if ONSTREAM_DEBUG idetape_stage_t *stage; os_aux_t *aux; unsigned char *p; #endif #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: Reached idetape_end_request\n"); #endif /* IDETAPE_DEBUG_LOG */ switch (uptodate) { case 0: error = IDETAPE_ERROR_GENERAL; break; case 1: error = 0; break; default: error = uptodate; } rq->errors = error; if (error) tape->failed_pc = NULL; spin_lock_irqsave(&tape->spinlock, flags); if (tape->active_data_request == rq) { /* The request was a pipelined data transfer request */ tape->active_stage = NULL; tape->active_data_request = NULL; tape->nr_pending_stages--; if (rq->cmd == IDETAPE_WRITE_RQ) { #if ONSTREAM_DEBUG if (tape->debug_level >= 2) { if (tape->onstream) { stage = tape->first_stage; aux = stage->aux; p = stage->bh->b_data; if (ntohl(aux->logical_blk_num) < 11300 && ntohl(aux->logical_blk_num) > 11100) printk(KERN_INFO "ide-tape: finished writing logical blk %u (data %x %x %x %x)\n", ntohl(aux->logical_blk_num), *p++, *p++, *p++, *p++); } } #endif if (tape->onstream && !tape->raw) { if (tape->first_frame_position == 0xba4) { #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk("ide-tape: %s: skipping over config parition..\n", tape->name); #endif tape->onstream_write_error = 2; if (tape->sem) up(tape->sem); } } remove_stage = 1; if (error) { set_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); if (error == IDETAPE_ERROR_EOD) idetape_abort_pipeline (drive); if (tape->onstream && !tape->raw && error == IDETAPE_ERROR_GENERAL && tape->sense.sense_key == 3) { clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); printk(KERN_ERR "ide-tape: %s: write error, enabling error recovery\n", tape->name); tape->onstream_write_error = 1; remove_stage = 0; tape->nr_pending_stages++; tape->next_stage = tape->first_stage; rq->current_nr_sectors = rq->nr_sectors; if (tape->sem) up(tape->sem); } } } else if (rq->cmd == IDETAPE_READ_RQ) { if (error == IDETAPE_ERROR_EOD) { set_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); idetape_abort_pipeline(drive); } } if (tape->next_stage != NULL && !tape->onstream_write_error) { idetape_active_next_stage (drive); /* * Insert the next request into the request queue. */ (void) ide_do_drive_cmd (drive, tape->active_data_request, ide_end); } else if (!error) { if (!tape->onstream) idetape_increase_max_pipeline_stages (drive); } } ide_end_drive_cmd (drive, 0, 0); if (remove_stage) idetape_remove_stage_head (drive); if (tape->active_data_request == NULL) clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); spin_unlock_irqrestore(&tape->spinlock, flags); } static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n"); #endif /* IDETAPE_DEBUG_LOG */ if (!tape->pc->error) { idetape_analyze_error (drive,(idetape_request_sense_result_t *) tape->pc->buffer); idetape_end_request (1,HWGROUP (drive)); } else { printk (KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n"); idetape_end_request (0,HWGROUP (drive)); } return ide_stopped; } static void idetape_create_request_sense_cmd (idetape_pc_t *pc) { idetape_init_pc (pc); pc->c[0] = IDETAPE_REQUEST_SENSE_CMD; pc->c[4] = 20; pc->request_transfer = 18; pc->callback = &idetape_request_sense_callback; } /* * idetape_queue_pc_head generates a new packet command request in front * of the request queue, before the current request, so that it will be * processed immediately, on the next pass through the driver. * * idetape_queue_pc_head is called from the request handling part of * the driver (the "bottom" part). Safe storage for the request should * be allocated with idetape_next_pc_storage and idetape_next_rq_storage * before calling idetape_queue_pc_head. * * Memory for those requests is pre-allocated at initialization time, and * is limited to IDETAPE_PC_STACK requests. We assume that we have enough * space for the maximum possible number of inter-dependent packet commands. * * The higher level of the driver - The ioctl handler and the character * device handling functions should queue request to the lower level part * and wait for their completion using idetape_queue_pc_tail or * idetape_queue_rw_tail. */ static void idetape_queue_pc_head (ide_drive_t *drive,idetape_pc_t *pc,struct request *rq) { ide_init_drive_cmd (rq); rq->buffer = (char *) pc; rq->cmd = IDETAPE_PC_RQ1; (void) ide_do_drive_cmd (drive, rq, ide_preempt); } /* * idetape_retry_pc is called when an error was detected during the * last packet command. We queue a request sense packet command in * the head of the request list. */ static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; idetape_pc_t *pc; struct request *rq; idetape_error_reg_t error; error.all = IN_BYTE (IDE_ERROR_REG); pc = idetape_next_pc_storage (drive); rq = idetape_next_rq_storage (drive); idetape_create_request_sense_cmd (pc); set_bit (IDETAPE_IGNORE_DSC, &tape->flags); idetape_queue_pc_head (drive, pc, rq); return ide_stopped; } /* * idetape_postpone_request postpones the current request so that * ide.c will be able to service requests from another device on * the same hwgroup while we are polling for DSC. */ static void idetape_postpone_request (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk(KERN_INFO "ide-tape: idetape_postpone_request\n"); #endif tape->postponed_rq = HWGROUP(drive)->rq; ide_stall_queue(drive, tape->dsc_polling_frequency); } /* * idetape_pc_intr is the usual interrupt handler which will be called * during a packet command. We will transfer some of the data (as * requested by the drive) and will re-point interrupt handler to us. * When data transfer is finished, we will act according to the * algorithm described before idetape_issue_packet_command. * */ static ide_startstop_t idetape_pc_intr (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; idetape_status_reg_t status; idetape_bcount_reg_t bcount; idetape_ireason_reg_t ireason; idetape_pc_t *pc=tape->pc; unsigned int temp; unsigned long cmd_time; #if SIMULATE_ERRORS static int error_sim_count = 0; #endif #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: Reached idetape_pc_intr interrupt handler\n"); #endif /* IDETAPE_DEBUG_LOG */ status.all = GET_STAT(); /* Clear the interrupt */ #ifdef CONFIG_BLK_DEV_IDEDMA if (test_bit (PC_DMA_IN_PROGRESS, &pc->flags)) { if (HWIF(drive)->dmaproc(ide_dma_end, drive)) { /* * A DMA error is sometimes expected. For example, * if the tape is crossing a filemark during a * READ command, it will issue an irq and position * itself before the filemark, so that only a partial * data transfer will occur (which causes the DMA * error). In that case, we will later ask the tape * how much bytes of the original request were * actually transferred (we can't receive that * information from the DMA engine on most chipsets). */ set_bit (PC_DMA_ERROR, &pc->flags); } else if (!status.b.check) { pc->actually_transferred=pc->request_transfer; idetape_update_buffers (pc); } #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: DMA finished\n"); #endif /* IDETAPE_DEBUG_LOG */ } #endif /* CONFIG_BLK_DEV_IDEDMA */ if (!status.b.drq) { /* No more interrupts */ cmd_time = (jiffies - tape->cmd_start_time) * 1000 / HZ; tape->max_cmd_time = IDE_MAX(cmd_time, tape->max_cmd_time); #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 2) printk (KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred); #endif /* IDETAPE_DEBUG_LOG */ clear_bit (PC_DMA_IN_PROGRESS, &pc->flags); ide__sti(); /* local CPU only */ #if SIMULATE_ERRORS if ((pc->c[0] == IDETAPE_WRITE_CMD || pc->c[0] == IDETAPE_READ_CMD) && (++error_sim_count % 100) == 0) { printk(KERN_INFO "ide-tape: %s: simulating error\n", tape->name); status.b.check = 1; } #endif if (status.b.check && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) status.b.check = 0; if (status.b.check || test_bit (PC_DMA_ERROR, &pc->flags)) { /* Error detected */ #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 1) printk (KERN_INFO "ide-tape: %s: I/O error, ",tape->name); #endif /* IDETAPE_DEBUG_LOG */ if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { printk (KERN_ERR "ide-tape: I/O error in request sense command\n"); return ide_do_reset (drive); } #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 1) printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]); #endif return idetape_retry_pc (drive); /* Retry operation */ } pc->error = 0; if (!tape->onstream && test_bit (PC_WAIT_FOR_DSC, &pc->flags) && !status.b.dsc) { /* Media access command */ tape->dsc_polling_start = jiffies; tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST; tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; idetape_postpone_request (drive); /* Allow ide.c to handle other requests */ return ide_stopped; } if (tape->failed_pc == pc) tape->failed_pc=NULL; return pc->callback(drive); /* Command finished - Call the callback function */ } #ifdef CONFIG_BLK_DEV_IDEDMA if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) { printk (KERN_ERR "ide-tape: The tape wants to issue more interrupts in DMA mode\n"); printk (KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); (void) HWIF(drive)->dmaproc(ide_dma_off, drive); return ide_do_reset (drive); } #endif /* CONFIG_BLK_DEV_IDEDMA */ bcount.b.high=IN_BYTE (IDE_BCOUNTH_REG); /* Get the number of bytes to transfer */ bcount.b.low=IN_BYTE (IDE_BCOUNTL_REG); /* on this interrupt */ ireason.all=IN_BYTE (IDE_IREASON_REG); if (ireason.b.cod) { printk (KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n"); return ide_do_reset (drive); } if (ireason.b.io == test_bit (PC_WRITING, &pc->flags)) { /* Hopefully, we will never get here */ printk (KERN_ERR "ide-tape: We wanted to %s, ", ireason.b.io ? "Write":"Read"); printk (KERN_ERR "ide-tape: but the tape wants us to %s !\n",ireason.b.io ? "Read":"Write"); return ide_do_reset (drive); } if (!test_bit (PC_WRITING, &pc->flags)) { /* Reading - Check that we have enough space */ temp = pc->actually_transferred + bcount.all; if ( temp > pc->request_transfer) { if (temp > pc->buffer_size) { printk (KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n"); idetape_discard_data (drive,bcount.all); ide_set_handler (drive,&idetape_pc_intr,IDETAPE_WAIT_CMD,NULL); return ide_started; } #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 2) printk (KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n"); #endif /* IDETAPE_DEBUG_LOG */ } } if (test_bit (PC_WRITING, &pc->flags)) { if (pc->bh != NULL) idetape_output_buffers (drive, pc, bcount.all); else atapi_output_bytes (drive,pc->current_position,bcount.all); /* Write the current buffer */ } else { if (pc->bh != NULL) idetape_input_buffers (drive, pc, bcount.all); else atapi_input_bytes (drive,pc->current_position,bcount.all); /* Read the current buffer */ } pc->actually_transferred+=bcount.all; /* Update the current position */ pc->current_position+=bcount.all; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes on that interrupt\n", pc->c[0], bcount.all); #endif ide_set_handler (drive,&idetape_pc_intr,IDETAPE_WAIT_CMD,NULL); /* And set the interrupt handler again */ return ide_started; } /* * Packet Command Interface * * The current Packet Command is available in tape->pc, and will not * change until we finish handling it. Each packet command is associated * with a callback function that will be called when the command is * finished. * * The handling will be done in three stages: * * 1. idetape_issue_packet_command will send the packet command to the * drive, and will set the interrupt handler to idetape_pc_intr. * * 2. On each interrupt, idetape_pc_intr will be called. This step * will be repeated until the device signals us that no more * interrupts will be issued. * * 3. ATAPI Tape media access commands have immediate status with a * delayed process. In case of a successful initiation of a * media access packet command, the DSC bit will be set when the * actual execution of the command is finished. * Since the tape drive will not issue an interrupt, we have to * poll for this event. In this case, we define the request as * "low priority request" by setting rq_status to * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit * the driver. * * ide.c will then give higher priority to requests which * originate from the other device, until will change rq_status * to RQ_ACTIVE. * * 4. When the packet command is finished, it will be checked for errors. * * 5. In case an error was found, we queue a request sense packet command * in front of the request queue and retry the operation up to * IDETAPE_MAX_PC_RETRIES times. * * 6. In case no error was found, or we decided to give up and not * to retry again, the callback function will be called and then * we will handle the next request. * */ static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; idetape_pc_t *pc = tape->pc; idetape_ireason_reg_t ireason; int retries = 100; ide_startstop_t startstop; if (ide_wait_stat (&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { printk (KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n"); return startstop; } ireason.all=IN_BYTE (IDE_IREASON_REG); while (retries-- && (!ireason.b.cod || ireason.b.io)) { printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing a packet command, retrying\n"); udelay(100); ireason.all = IN_BYTE(IDE_IREASON_REG); if (retries == 0) { printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing a packet command, ignoring\n"); ireason.b.cod = 1; ireason.b.io = 0; } } if (!ireason.b.cod || ireason.b.io) { printk (KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing a packet command\n"); return ide_do_reset (drive); } tape->cmd_start_time = jiffies; ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); /* Set the interrupt routine */ atapi_output_bytes (drive,pc->c,12); /* Send the actual packet */ return ide_started; } static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc) { idetape_tape_t *tape = drive->driver_data; idetape_bcount_reg_t bcount; int dma_ok=0; #if IDETAPE_DEBUG_BUGS if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { printk (KERN_ERR "ide-tape: possible ide-tape.c bug - Two request sense in serial were issued\n"); } #endif /* IDETAPE_DEBUG_BUGS */ if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD) tape->failed_pc=pc; tape->pc=pc; /* Set the current packet command */ if (pc->retries > IDETAPE_MAX_PC_RETRIES || test_bit (PC_ABORT, &pc->flags)) { /* * We will "abort" retrying a packet command in case * a legitimate error code was received (crossing a * filemark, or DMA error in the end of media, for * example). */ if (!test_bit (PC_ABORT, &pc->flags)) { if (!(pc->c[0] == 0 && tape->sense_key == 2 && tape->asc == 4 && (tape->ascq == 1 || tape->ascq == 8))) { printk (KERN_ERR "ide-tape: %s: I/O error, pc = %2x, key = %2x, asc = %2x, ascq = %2x\n", tape->name, pc->c[0], tape->sense_key, tape->asc, tape->ascq); if (tape->onstream && pc->c[0] == 8 && tape->sense_key == 3 && tape->asc == 0x11) /* AJN-1: 11 should be 0x11 */ printk(KERN_ERR "ide-tape: %s: enabling read error recovery\n", tape->name); } pc->error = IDETAPE_ERROR_GENERAL; /* Giving up */ } tape->failed_pc=NULL; return pc->callback(drive); } #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 2) printk (KERN_INFO "ide-tape: Retry number - %d\n",pc->retries); #endif /* IDETAPE_DEBUG_LOG */ pc->retries++; pc->actually_transferred=0; /* We haven't transferred any data yet */ pc->current_position=pc->buffer; bcount.all=pc->request_transfer; /* Request to transfer the entire buffer at once */ #ifdef CONFIG_BLK_DEV_IDEDMA if (test_and_clear_bit (PC_DMA_ERROR, &pc->flags)) { printk (KERN_WARNING "ide-tape: DMA disabled, reverting to PIO\n"); (void) HWIF(drive)->dmaproc(ide_dma_off, drive); } if (test_bit (PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma) dma_ok=!HWIF(drive)->dmaproc(test_bit (PC_WRITING, &pc->flags) ? ide_dma_write : ide_dma_read, drive); #endif /* CONFIG_BLK_DEV_IDEDMA */ if (IDE_CONTROL_REG) OUT_BYTE (drive->ctl,IDE_CONTROL_REG); OUT_BYTE (dma_ok ? 1:0,IDE_FEATURE_REG); /* Use PIO/DMA */ OUT_BYTE (bcount.b.high,IDE_BCOUNTH_REG); OUT_BYTE (bcount.b.low,IDE_BCOUNTL_REG); OUT_BYTE (drive->select.all,IDE_SELECT_REG); #ifdef CONFIG_BLK_DEV_IDEDMA if (dma_ok) { /* Begin DMA, if necessary */ set_bit (PC_DMA_IN_PROGRESS, &pc->flags); (void) (HWIF(drive)->dmaproc(ide_dma_begin, drive)); } #endif /* CONFIG_BLK_DEV_IDEDMA */ if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) { ide_set_handler(drive, &idetape_transfer_pc, IDETAPE_WAIT_CMD, NULL); OUT_BYTE(WIN_PACKETCMD, IDE_COMMAND_REG); return ide_started; } else { OUT_BYTE(WIN_PACKETCMD, IDE_COMMAND_REG); return idetape_transfer_pc(drive); } } /* * General packet command callback function. */ static ide_startstop_t idetape_pc_callback (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: Reached idetape_pc_callback\n"); #endif /* IDETAPE_DEBUG_LOG */ idetape_end_request (tape->pc->error ? 0:1, HWGROUP(drive)); return ide_stopped; } /* * A mode sense command is used to "sense" tape parameters. */ static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, byte page_code) { idetape_init_pc (pc); pc->c[0] = IDETAPE_MODE_SENSE_CMD; pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors for now */ pc->c[2] = page_code; pc->c[3] = 255; /* Don't limit the returned information */ pc->c[4] = 255; /* (We will just discard data in that case) */ if (page_code == IDETAPE_CAPABILITIES_PAGE) pc->request_transfer = 24; else pc->request_transfer = 50; pc->callback = &idetape_pc_callback; } static ide_startstop_t idetape_onstream_buffer_fill_callback (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; tape->max_frames = tape->pc->buffer[4 + 2]; tape->cur_frames = tape->pc->buffer[4 + 3]; if (tape->chrdev_direction == idetape_direction_write) tape->tape_head = tape->buffer_head - tape->cur_frames; else tape->tape_head = tape->buffer_head + tape->cur_frames; if (tape->tape_head != tape->last_tape_head) { tape->last_tape_head = tape->tape_head; tape->tape_still_time_begin = jiffies; if (tape->tape_still_time > 200) tape->measure_insert_time = 1; } tape->tape_still_time = (jiffies - tape->tape_still_time_begin) * 1000 / HZ; #if USE_IOTRACE IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); #endif #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 1) printk(KERN_INFO "ide-tape: buffer fill callback, %d/%d\n", tape->cur_frames, tape->max_frames); #endif idetape_end_request (tape->pc->error ? 0:1, HWGROUP(drive)); return ide_stopped; } static void idetape_queue_onstream_buffer_fill (ide_drive_t *drive) { idetape_pc_t *pc; struct request *rq; pc = idetape_next_pc_storage (drive); rq = idetape_next_rq_storage (drive); idetape_create_mode_sense_cmd (pc, 0x33); pc->callback = idetape_onstream_buffer_fill_callback; idetape_queue_pc_head (drive, pc, rq); } static void calculate_speeds(ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; int full = 125, empty = 75; if (jiffies > tape->controlled_pipeline_head_time + 120 * HZ) { tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head; tape->controlled_previous_head_time = tape->controlled_pipeline_head_time; tape->controlled_last_pipeline_head = tape->pipeline_head; tape->controlled_pipeline_head_time = jiffies; } if (jiffies > tape->controlled_pipeline_head_time + 60 * HZ) tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time); else if (jiffies > tape->controlled_previous_head_time) tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time); if (tape->nr_pending_stages < tape->max_stages /*- 1 */) { /* -1 for read mode error recovery */ if (jiffies > tape->uncontrolled_previous_head_time + 10 * HZ) { tape->uncontrolled_pipeline_head_time = jiffies; tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time); } } else { tape->uncontrolled_previous_head_time = jiffies; tape->uncontrolled_previous_pipeline_head = tape->pipeline_head; if (jiffies > tape->uncontrolled_pipeline_head_time + 30 * HZ) { tape->uncontrolled_pipeline_head_time = jiffies; } } tape->pipeline_head_speed = IDE_MAX(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed); if (tape->speed_control == 0) { tape->max_insert_speed = 5000; } else if (tape->speed_control == 1) { if (tape->nr_pending_stages >= tape->max_stages / 2) tape->max_insert_speed = tape->pipeline_head_speed + (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages; else tape->max_insert_speed = 500 + (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages; if (tape->nr_pending_stages >= tape->max_stages * 99 / 100) tape->max_insert_speed = 5000; } else if (tape->speed_control == 2) { tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 + (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages; } else tape->max_insert_speed = tape->speed_control; tape->max_insert_speed = IDE_MAX(tape->max_insert_speed, 500); } static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; idetape_pc_t *pc = tape->pc; idetape_status_reg_t status; if (tape->onstream) printk(KERN_INFO "ide-tape: bug: onstream, media_access_finished\n"); status.all = GET_STAT(); if (status.b.dsc) { if (status.b.check) { /* Error detected */ printk (KERN_ERR "ide-tape: %s: I/O error, ",tape->name); return idetape_retry_pc (drive); /* Retry operation */ } pc->error = 0; if (tape->failed_pc == pc) tape->failed_pc = NULL; } else { pc->error = IDETAPE_ERROR_GENERAL; tape->failed_pc = NULL; } return pc->callback (drive); } static ide_startstop_t idetape_rw_callback (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; struct request *rq = HWGROUP(drive)->rq; int blocks = tape->pc->actually_transferred / tape->tape_block_size; tape->avg_size += blocks * tape->tape_block_size; tape->insert_size += blocks * tape->tape_block_size; if (tape->insert_size > 1024 * 1024) tape->measure_insert_time = 1; if (tape->measure_insert_time) { tape->measure_insert_time = 0; tape->insert_time = jiffies; tape->insert_size = 0; } if (jiffies > tape->insert_time) tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); if (jiffies - tape->avg_time >= HZ) { tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024; tape->avg_size = 0; tape->avg_time = jiffies; } #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: Reached idetape_rw_callback\n"); #endif /* IDETAPE_DEBUG_LOG */ tape->first_frame_position += blocks; rq->current_nr_sectors -= blocks; if (!tape->pc->error) idetape_end_request (1, HWGROUP (drive)); else idetape_end_request (tape->pc->error, HWGROUP (drive)); return ide_stopped; } static void idetape_create_read_cmd (idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct buffer_head *bh) { struct buffer_head *p = bh; idetape_init_pc (pc); pc->c[0] = IDETAPE_READ_CMD; put_unaligned (htonl (length), (unsigned int *) &pc->c[1]); pc->c[1] = 1; pc->callback = &idetape_rw_callback; pc->bh = bh; atomic_set(&bh->b_count, 0); pc->buffer = NULL; if (tape->onstream) { while (p) { atomic_set(&p->b_count, 0); p = p->b_reqnext; } } if (!tape->onstream) { pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; if (pc->request_transfer == tape->stage_size) set_bit (PC_DMA_RECOMMENDED, &pc->flags); } else { if (length) { pc->request_transfer = pc->buffer_size = 32768 + 512; set_bit (PC_DMA_RECOMMENDED, &pc->flags); } else pc->request_transfer = 0; } } static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct buffer_head *bh) { int size = 32768; struct buffer_head *p = bh; idetape_init_pc (pc); pc->c[0] = IDETAPE_READ_BUFFER_CMD; pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK; pc->c[7] = size >> 8; pc->c[8] = size & 0xff; pc->callback = &idetape_pc_callback; pc->bh = bh; atomic_set(&bh->b_count, 0); pc->buffer = NULL; while (p) { atomic_set(&p->b_count, 0); p = p->b_reqnext; } pc->request_transfer = pc->buffer_size = size; } static void idetape_create_write_cmd (idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct buffer_head *bh) { struct buffer_head *p = bh; idetape_init_pc (pc); pc->c[0] = IDETAPE_WRITE_CMD; put_unaligned (htonl (length), (unsigned int *) &pc->c[1]); pc->c[1] = 1; pc->callback = &idetape_rw_callback; set_bit (PC_WRITING, &pc->flags); if (tape->onstream) { while (p) { atomic_set(&p->b_count, p->b_size); p = p->b_reqnext; } } pc->bh = bh; pc->b_data = bh->b_data; pc->b_count = atomic_read(&bh->b_count); pc->buffer = NULL; if (!tape->onstream) { pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; if (pc->request_transfer == tape->stage_size) set_bit (PC_DMA_RECOMMENDED, &pc->flags); } else { if (length) { pc->request_transfer = pc->buffer_size = 32768 + 512; set_bit (PC_DMA_RECOMMENDED, &pc->flags); } else pc->request_transfer = 0; } } /* * idetape_do_request is our request handling function. */ static ide_startstop_t idetape_do_request (ide_drive_t *drive, struct request *rq, unsigned long block) { idetape_tape_t *tape = drive->driver_data; idetape_pc_t *pc; struct request *postponed_rq = tape->postponed_rq; idetape_status_reg_t status; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 5) printk (KERN_INFO "ide-tape: rq_status: %d, rq_dev: %u, cmd: %d, errors: %d\n",rq->rq_status,(unsigned int) rq->rq_dev,rq->cmd,rq->errors); if (tape->debug_level >= 2) printk (KERN_INFO "ide-tape: sector: %ld, nr_sectors: %ld, current_nr_sectors: %ld\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors); #endif /* IDETAPE_DEBUG_LOG */ if (!IDETAPE_RQ_CMD (rq->cmd)) { /* * We do not support buffer cache originated requests. */ printk (KERN_NOTICE "ide-tape: %s: Unsupported command in request queue (%d)\n", drive->name, rq->cmd); ide_end_request (0,HWGROUP (drive)); /* Let the common code handle it */ return ide_stopped; } /* * Retry a failed packet command */ if (tape->failed_pc != NULL && tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { return idetape_issue_packet_command (drive, tape->failed_pc); } #if IDETAPE_DEBUG_BUGS if (postponed_rq != NULL) if (rq != postponed_rq) { printk (KERN_ERR "ide-tape: ide-tape.c bug - Two DSC requests were queued\n"); idetape_end_request (0,HWGROUP (drive)); return ide_stopped; } #endif /* IDETAPE_DEBUG_BUGS */ tape->postponed_rq = NULL; /* * If the tape is still busy, postpone our request and service * the other device meanwhile. */ status.all = GET_STAT(); /* * The OnStream tape drive doesn't support DSC. Assume * that DSC is always set. */ if (tape->onstream) status.b.dsc = 1; if (!drive->dsc_overlap && rq->cmd != IDETAPE_PC_RQ2) set_bit (IDETAPE_IGNORE_DSC, &tape->flags); /* * For the OnStream tape, check the current status of the tape * internal buffer using data gathered from the buffer fill * mode page, and postpone our request, effectively "disconnecting" * from the IDE bus, in case the buffer is full (writing) or * empty (reading), and there is a danger that our request will * hold the IDE bus during actual media access. */ if (tape->tape_still_time > 100 && tape->tape_still_time < 200) tape->measure_insert_time = 1; if (tape->req_buffer_fill && (rq->cmd == IDETAPE_WRITE_RQ || rq->cmd == IDETAPE_READ_RQ)) { tape->req_buffer_fill = 0; tape->writes_since_buffer_fill = 0; tape->reads_since_buffer_fill = 0; tape->last_buffer_fill = jiffies; idetape_queue_onstream_buffer_fill(drive); if (jiffies > tape->insert_time) tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); return ide_stopped; } if (jiffies > tape->insert_time) tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); calculate_speeds(drive); if (tape->onstream && tape->max_frames && ((rq->cmd == IDETAPE_WRITE_RQ && (tape->cur_frames == tape->max_frames || (tape->speed_control && tape->cur_frames > 5 && (tape->insert_speed > tape->max_insert_speed || (0 /* tape->cur_frames > 30 && tape->tape_still_time > 200 */))))) || (rq->cmd == IDETAPE_READ_RQ && (tape->cur_frames == 0 || (tape->speed_control && (tape->cur_frames < tape->max_frames - 5) && tape->insert_speed > tape->max_insert_speed)) && rq->nr_sectors))) { #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk(KERN_INFO "ide-tape: postponing request, cmd %d, cur %d, max %d\n", rq->cmd, tape->cur_frames, tape->max_frames); #endif if (tape->postpone_cnt++ < 500) { status.b.dsc = 0; tape->req_buffer_fill = 1; } #if ONSTREAM_DEBUG else if (tape->debug_level >= 4) printk(KERN_INFO "ide-tape: %s: postpone_cnt %d\n", tape->name, tape->postpone_cnt); #endif } if (!test_and_clear_bit (IDETAPE_IGNORE_DSC, &tape->flags) && !status.b.dsc) { if (postponed_rq == NULL) { tape->dsc_polling_start = jiffies; tape->dsc_polling_frequency = tape->best_dsc_rw_frequency; tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; } else if ((signed long) (jiffies - tape->dsc_timeout) > 0) { printk (KERN_ERR "ide-tape: %s: DSC timeout\n", tape->name); if (rq->cmd == IDETAPE_PC_RQ2) { idetape_media_access_finished (drive); return ide_stopped; } else { return ide_do_reset (drive); } } else if (jiffies - tape->dsc_polling_start > IDETAPE_DSC_MA_THRESHOLD) tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW; idetape_postpone_request (drive); return ide_stopped; } switch (rq->cmd) { case IDETAPE_READ_RQ: tape->buffer_head++; #if USE_IOTRACE IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); #endif tape->postpone_cnt = 0; tape->reads_since_buffer_fill++; if (tape->onstream) { if (tape->cur_frames - tape->reads_since_buffer_fill <= 0) tape->req_buffer_fill = 1; if (jiffies > tape->last_buffer_fill + 5 * HZ / 100) tape->req_buffer_fill = 1; } pc=idetape_next_pc_storage (drive); idetape_create_read_cmd (tape, pc, rq->current_nr_sectors, rq->bh); break; case IDETAPE_WRITE_RQ: tape->buffer_head++; #if USE_IOTRACE IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); #endif tape->postpone_cnt = 0; tape->writes_since_buffer_fill++; if (tape->onstream) { if (tape->cur_frames + tape->writes_since_buffer_fill >= tape->max_frames) tape->req_buffer_fill = 1; if (jiffies > tape->last_buffer_fill + 5 * HZ / 100) tape->req_buffer_fill = 1; calculate_speeds(drive); } pc=idetape_next_pc_storage (drive); idetape_create_write_cmd (tape, pc, rq->current_nr_sectors, rq->bh); break; case IDETAPE_READ_BUFFER_RQ: tape->postpone_cnt = 0; pc=idetape_next_pc_storage (drive); idetape_create_read_buffer_cmd (tape, pc, rq->current_nr_sectors, rq->bh); break; case IDETAPE_ABORTED_WRITE_RQ: rq->cmd = IDETAPE_WRITE_RQ; idetape_end_request (IDETAPE_ERROR_EOD, HWGROUP(drive)); return ide_stopped; case IDETAPE_ABORTED_READ_RQ: #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: detected aborted read rq\n", tape->name); #endif rq->cmd = IDETAPE_READ_RQ; idetape_end_request (IDETAPE_ERROR_EOD, HWGROUP(drive)); return ide_stopped; case IDETAPE_PC_RQ1: pc=(idetape_pc_t *) rq->buffer; rq->cmd = IDETAPE_PC_RQ2; break; case IDETAPE_PC_RQ2: idetape_media_access_finished (drive); return ide_stopped; default: printk (KERN_ERR "ide-tape: bug in IDETAPE_RQ_CMD macro\n"); idetape_end_request (0,HWGROUP (drive)); return ide_stopped; } return idetape_issue_packet_command (drive, pc); } /* * Pipeline related functions */ static inline int idetape_pipeline_active (idetape_tape_t *tape) { int rc1, rc2; rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); rc2 = (tape->active_data_request != NULL); return rc1; } /* * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline * stage, along with all the necessary small buffers which together make * a buffer of size tape->stage_size (or a bit more). We attempt to * combine sequential pages as much as possible. * * Returns a pointer to the new allocated stage, or NULL if we * can't (or don't want to) allocate a stage. * * Pipeline stages are optional and are used to increase performance. * If we can't allocate them, we'll manage without them. */ static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear) { idetape_stage_t *stage; struct buffer_head *prev_bh, *bh; int pages = tape->pages_per_stage; char *b_data; if ((stage = (idetape_stage_t *) kmalloc (sizeof (idetape_stage_t),GFP_KERNEL)) == NULL) return NULL; stage->next = NULL; bh = stage->bh = (struct buffer_head *) kmalloc (sizeof (struct buffer_head), GFP_KERNEL); if (bh == NULL) goto abort; bh->b_reqnext = NULL; if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) goto abort; if (clear) memset(bh->b_data, 0, PAGE_SIZE); bh->b_size = PAGE_SIZE; atomic_set(&bh->b_count, full ? bh->b_size : 0); set_bit (BH_Lock, &bh->b_state); while (--pages) { if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) goto abort; if (clear) memset(b_data, 0, PAGE_SIZE); if (bh->b_data == b_data + PAGE_SIZE) { bh->b_size += PAGE_SIZE; bh->b_data -= PAGE_SIZE; if (full) atomic_add(PAGE_SIZE, &bh->b_count); continue; } if (b_data == bh->b_data + bh->b_size) { bh->b_size += PAGE_SIZE; if (full) atomic_add(PAGE_SIZE, &bh->b_count); continue; } prev_bh = bh; if ((bh = (struct buffer_head *) kmalloc (sizeof (struct buffer_head), GFP_KERNEL)) == NULL) { free_page ((unsigned long) b_data); goto abort; } bh->b_reqnext = NULL; bh->b_data = b_data; bh->b_size = PAGE_SIZE; atomic_set(&bh->b_count, full ? bh->b_size : 0); set_bit (BH_Lock, &bh->b_state); prev_bh->b_reqnext = bh; } bh->b_size -= tape->excess_bh_size; if (full) atomic_sub(tape->excess_bh_size, &bh->b_count); if (tape->onstream) stage->aux = (os_aux_t *) (bh->b_data + bh->b_size - OS_AUX_SIZE); return stage; abort: __idetape_kfree_stage (stage); return NULL; } static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape) { idetape_stage_t *cache_stage = tape->cache_stage; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n"); #endif /* IDETAPE_DEBUG_LOG */ if (tape->nr_stages >= tape->max_stages) return NULL; if (cache_stage != NULL) { tape->cache_stage = NULL; return cache_stage; } return __idetape_kmalloc_stage (tape, 0, 0); } static void idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char *buf, int n) { struct buffer_head *bh = tape->bh; int count; while (n) { #if IDETAPE_DEBUG_BUGS if (bh == NULL) { printk (KERN_ERR "ide-tape: bh == NULL in idetape_copy_stage_from_user\n"); return; } #endif /* IDETAPE_DEBUG_BUGS */ count = IDE_MIN (bh->b_size - atomic_read(&bh->b_count), n); copy_from_user (bh->b_data + atomic_read(&bh->b_count), buf, count); n -= count; atomic_add(count, &bh->b_count); buf += count; if (atomic_read(&bh->b_count) == bh->b_size) { bh = bh->b_reqnext; if (bh) atomic_set(&bh->b_count, 0); } } tape->bh = bh; } static void idetape_copy_stage_to_user (idetape_tape_t *tape, char *buf, idetape_stage_t *stage, int n) { struct buffer_head *bh = tape->bh; int count; while (n) { #if IDETAPE_DEBUG_BUGS if (bh == NULL) { printk (KERN_ERR "ide-tape: bh == NULL in idetape_copy_stage_to_user\n"); return; } #endif /* IDETAPE_DEBUG_BUGS */ count = IDE_MIN (tape->b_count, n); copy_to_user (buf, tape->b_data, count); n -= count; tape->b_data += count; tape->b_count -= count; buf += count; if (!tape->b_count) { tape->bh = bh = bh->b_reqnext; if (bh) { tape->b_data = bh->b_data; tape->b_count = atomic_read(&bh->b_count); } } } } static void idetape_init_merge_stage (idetape_tape_t *tape) { struct buffer_head *bh = tape->merge_stage->bh; tape->bh = bh; if (tape->chrdev_direction == idetape_direction_write) atomic_set(&bh->b_count, 0); else { tape->b_data = bh->b_data; tape->b_count = atomic_read(&bh->b_count); } } static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage) { struct buffer_head *tmp; os_aux_t *tmp_aux; tmp = stage->bh; tmp_aux = stage->aux; stage->bh = tape->merge_stage->bh; stage->aux = tape->merge_stage->aux; tape->merge_stage->bh = tmp; tape->merge_stage->aux = tmp_aux; idetape_init_merge_stage (tape); } /* * idetape_add_stage_tail adds a new stage at the end of the pipeline. */ static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage) { idetape_tape_t *tape = drive->driver_data; unsigned long flags; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n"); #endif /* IDETAPE_DEBUG_LOG */ spin_lock_irqsave(&tape->spinlock, flags); stage->next=NULL; if (tape->last_stage != NULL) tape->last_stage->next=stage; else tape->first_stage=tape->next_stage=stage; tape->last_stage=stage; if (tape->next_stage == NULL) tape->next_stage=tape->last_stage; tape->nr_stages++; tape->nr_pending_stages++; spin_unlock_irqrestore(&tape->spinlock, flags); } /* * Initialize the OnStream AUX */ static void idetape_init_stage (ide_drive_t *drive, idetape_stage_t *stage, int frame_type, int logical_blk_num) { idetape_tape_t *tape = drive->driver_data; os_aux_t *aux = stage->aux; os_partition_t *par = &aux->partition; os_dat_t *dat = &aux->dat; if (!tape->onstream || tape->raw) return; memset(aux, 0, sizeof(*aux)); aux->format_id = htonl(0); memcpy(aux->application_sig, "LIN3", 4); aux->hdwr = htonl(0); aux->frame_type = frame_type; if (frame_type == OS_FRAME_TYPE_HEADER) { aux->update_frame_cntr = htonl(tape->update_frame_cntr); par->partition_num = OS_CONFIG_PARTITION; par->par_desc_ver = OS_PARTITION_VERSION; par->wrt_pass_cntr = htons(0xffff); par->first_frame_addr = htonl(0); par->last_frame_addr = htonl(0xbb7); } else { aux->update_frame_cntr = htonl(0); par->partition_num = OS_DATA_PARTITION; par->par_desc_ver = OS_PARTITION_VERSION; par->wrt_pass_cntr = htons(tape->wrt_pass_cntr); par->first_frame_addr = htonl(0x14); par->last_frame_addr = htonl(19239 * 24); } if (frame_type != OS_FRAME_TYPE_HEADER) { aux->frame_seq_num = htonl(logical_blk_num); aux->logical_blk_num_high = htonl(0); aux->logical_blk_num = htonl(logical_blk_num); } else { aux->frame_seq_num = htonl(0); aux->logical_blk_num_high = htonl(0); aux->logical_blk_num = htonl(0); } if (frame_type != OS_FRAME_TYPE_HEADER) { dat->dat_sz = 8; dat->reserved1 = 0; dat->entry_cnt = 1; dat->reserved3 = 0; if (frame_type == OS_FRAME_TYPE_DATA) dat->dat_list[0].blk_sz = htonl(32 * 1024); else dat->dat_list[0].blk_sz = 0; dat->dat_list[0].blk_cnt = htons(1); if (frame_type == OS_FRAME_TYPE_MARKER) dat->dat_list[0].flags = OS_DAT_FLAGS_MARK; else dat->dat_list[0].flags = OS_DAT_FLAGS_DATA; dat->dat_list[0].reserved = 0; } else aux->next_mark_addr = htonl(tape->first_mark_addr); aux->filemark_cnt = ntohl(tape->filemark_cnt); aux->phys_fm = ntohl(0xffffffff); aux->last_mark_addr = ntohl(tape->last_mark_addr); } /* * idetape_wait_for_request installs a semaphore in a pending request * and sleeps until it is serviced. * * The caller should ensure that the request will not be serviced * before we install the semaphore (usually by disabling interrupts). */ static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq) { DECLARE_MUTEX_LOCKED(sem); idetape_tape_t *tape = drive->driver_data; #if IDETAPE_DEBUG_BUGS if (rq == NULL || !IDETAPE_RQ_CMD (rq->cmd)) { printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n"); return; } #endif /* IDETAPE_DEBUG_BUGS */ rq->sem = &sem; tape->sem = &sem; spin_unlock(&tape->spinlock); down(&sem); rq->sem = NULL; tape->sem = NULL; spin_lock_irq(&tape->spinlock); } static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; idetape_read_position_result_t *result; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: Reached idetape_read_position_callback\n"); #endif /* IDETAPE_DEBUG_LOG */ if (!tape->pc->error) { result = (idetape_read_position_result_t *) tape->pc->buffer; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 2) printk (KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No"); if (tape->debug_level >= 2) printk (KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No"); #endif /* IDETAPE_DEBUG_LOG */ if (result->bpu) { printk (KERN_INFO "ide-tape: Block location is unknown to the tape\n"); clear_bit (IDETAPE_ADDRESS_VALID, &tape->flags); idetape_end_request (0,HWGROUP (drive)); } else { #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 2) printk (KERN_INFO "ide-tape: Block Location - %u\n", ntohl (result->first_block)); #endif /* IDETAPE_DEBUG_LOG */ tape->partition = result->partition; tape->first_frame_position = ntohl (result->first_block); tape->last_frame_position = ntohl (result->last_block); tape->blocks_in_buffer = result->blocks_in_buffer[2]; set_bit (IDETAPE_ADDRESS_VALID, &tape->flags); idetape_end_request (1,HWGROUP (drive)); } } else { idetape_end_request (0,HWGROUP (drive)); } return ide_stopped; } /* * idetape_create_write_filemark_cmd will: * * 1. Write a filemark if write_filemark=1. * 2. Flush the device buffers without writing a filemark * if write_filemark=0. * */ static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark) { idetape_tape_t *tape = drive->driver_data; idetape_init_pc (pc); pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD; if (tape->onstream) pc->c[1] = 1; pc->c[4] = write_filemark; set_bit (PC_WAIT_FOR_DSC, &pc->flags); pc->callback = &idetape_pc_callback; } static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc) { idetape_init_pc(pc); pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD; pc->callback = &idetape_pc_callback; } /* * idetape_queue_pc_tail is based on the following functions: * * ide_do_drive_cmd from ide.c * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c * * We add a special packet command request to the tail of the request queue, * and wait for it to be serviced. * * This is not to be called from within the request handling part * of the driver ! We allocate here data in the stack, and it is valid * until the request is finished. This is not the case for the bottom * part of the driver, where we are always leaving the functions to wait * for an interrupt or a timer event. * * From the bottom part of the driver, we should allocate safe memory * using idetape_next_pc_storage and idetape_next_rq_storage, and add * the request to the request list without waiting for it to be serviced ! * In that case, we usually use idetape_queue_pc_head. */ static int __idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc) { struct request rq; ide_init_drive_cmd (&rq); rq.buffer = (char *) pc; rq.cmd = IDETAPE_PC_RQ1; return ide_do_drive_cmd (drive, &rq, ide_wait); } static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd) { idetape_tape_t *tape = drive->driver_data; idetape_init_pc (pc); pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD; pc->c[4] = cmd; if (tape->onstream) { pc->c[1] = 1; if (cmd == !IDETAPE_LU_LOAD_MASK) pc->c[4] = 4; } set_bit (PC_WAIT_FOR_DSC, &pc->flags); pc->callback = &idetape_pc_callback; } static int idetape_wait_ready (ide_drive_t *drive, unsigned long long timeout) { idetape_tape_t *tape = drive->driver_data; idetape_pc_t pc; /* * Wait for the tape to become ready */ timeout += jiffies; while (jiffies < timeout) { idetape_create_test_unit_ready_cmd(&pc); if (!__idetape_queue_pc_tail(drive, &pc)) return 0; if (tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) { idetape_create_load_unload_cmd (drive, &pc, IDETAPE_LU_LOAD_MASK); __idetape_queue_pc_tail(drive,&pc); idetape_create_test_unit_ready_cmd(&pc); if (!__idetape_queue_pc_tail(drive, &pc)) return 0; } if (!(tape->sense_key == 2 && tape->asc == 4 && (tape->ascq == 1 || tape->ascq == 8))) break; current->state = TASK_INTERRUPTIBLE; schedule_timeout(HZ / 10); } return -EIO; } static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc) { idetape_tape_t *tape = drive->driver_data; int rc; rc = __idetape_queue_pc_tail(drive, pc); if (rc) return rc; if (tape->onstream && test_bit(PC_WAIT_FOR_DSC, &pc->flags)) rc = idetape_wait_ready(drive, 60 * 10 * HZ); /* AJN-4: Changed from 5 to 10 minutes; because retension takes approx. 8:20 with Onstream 30GB tape */ return rc; } static int idetape_flush_tape_buffers (ide_drive_t *drive) { idetape_pc_t pc; int rc; idetape_create_write_filemark_cmd(drive, &pc, 0); if ((rc = idetape_queue_pc_tail (drive,&pc))) return rc; idetape_wait_ready(drive, 60 * 5 * HZ); return 0; } static void idetape_create_read_position_cmd (idetape_pc_t *pc) { idetape_init_pc (pc); pc->c[0] = IDETAPE_READ_POSITION_CMD; pc->request_transfer = 20; pc->callback = &idetape_read_position_callback; } static int idetape_read_position (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; idetape_pc_t pc; int position; #ifdef NO_LONGER_REQUIRED idetape_flush_tape_buffers(drive); #endif idetape_create_read_position_cmd(&pc); if (idetape_queue_pc_tail (drive,&pc)) return -1; position = tape->first_frame_position; #ifdef NO_LONGER_REQUIRED if (tape->onstream) { if ((position != tape->last_frame_position - tape->blocks_in_buffer) && (position != tape->last_frame_position + tape->blocks_in_buffer)) { if (tape->blocks_in_buffer == 0) { printk("ide-tape: %s: correcting read position %d, %d, %d\n", tape->name, position, tape->last_frame_position, tape->blocks_in_buffer); position = tape->last_frame_position; tape->first_frame_position = position; } } } #endif return position; } static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, byte partition, int skip) { idetape_tape_t *tape = drive->driver_data; idetape_init_pc (pc); pc->c[0] = IDETAPE_LOCATE_CMD; if (tape->onstream) pc->c[1] = 1; else pc->c[1] = 2; put_unaligned (htonl (block), (unsigned int *) &pc->c[3]); pc->c[8] = partition; if (tape->onstream) pc->c[9] = skip << 7; set_bit (PC_WAIT_FOR_DSC, &pc->flags); pc->callback = &idetape_pc_callback; } static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent) { idetape_tape_t *tape = drive->driver_data; if (!tape->capabilities.lock) return 0; idetape_init_pc(pc); pc->c[0] = IDETAPE_PREVENT_CMD; pc->c[4] = prevent; pc->callback = &idetape_pc_callback; return 1; } static int __idetape_discard_read_pipeline (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; unsigned long flags; int cnt; if (tape->chrdev_direction != idetape_direction_read) return 0; tape->merge_stage_size = 0; if (tape->merge_stage != NULL) { __idetape_kfree_stage (tape->merge_stage); tape->merge_stage = NULL; } tape->chrdev_direction = idetape_direction_none; if (tape->first_stage == NULL) return 0; spin_lock_irqsave(&tape->spinlock, flags); tape->next_stage = NULL; if (idetape_pipeline_active (tape)) idetape_wait_for_request(drive, tape->active_data_request); spin_unlock_irqrestore(&tape->spinlock, flags); cnt = tape->nr_stages - tape->nr_pending_stages; while (tape->first_stage != NULL) idetape_remove_stage_head (drive); tape->nr_pending_stages = 0; tape->max_stages = tape->min_pipeline; return cnt; } /* * idetape_position_tape positions the tape to the requested block * using the LOCATE packet command. A READ POSITION command is then * issued to check where we are positioned. * * Like all higher level operations, we queue the commands at the tail * of the request queue and wait for their completion. * */ static int idetape_position_tape (ide_drive_t *drive, unsigned int block, byte partition, int skip) { idetape_tape_t *tape = drive->driver_data; int retval; idetape_pc_t pc; if (tape->chrdev_direction == idetape_direction_read) __idetape_discard_read_pipeline(drive); idetape_wait_ready(drive, 60 * 5 * HZ); idetape_create_locate_cmd (drive, &pc, block, partition, skip); retval=idetape_queue_pc_tail (drive,&pc); if (retval) return (retval); idetape_create_read_position_cmd (&pc); return (idetape_queue_pc_tail (drive,&pc)); } static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position) { idetape_tape_t *tape = drive->driver_data; int cnt; int seek, position; cnt = __idetape_discard_read_pipeline(drive); if (restore_position) { position = idetape_read_position(drive); #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: address %u, nr_stages %d\n", position, cnt); #endif seek = position > cnt ? position - cnt : 0; if (idetape_position_tape(drive, seek, 0, 0)) { printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name); return; } } } static void idetape_update_stats (ide_drive_t *drive) { idetape_pc_t pc; idetape_create_mode_sense_cmd (&pc, 0x33); pc.callback = idetape_onstream_buffer_fill_callback; (void) idetape_queue_pc_tail(drive, &pc); } /* * idetape_queue_rw_tail generates a read/write request for the block * device interface and wait for it to be serviced. */ static int idetape_queue_rw_tail (ide_drive_t *drive, int cmd, int blocks, struct buffer_head *bh) { idetape_tape_t *tape = drive->driver_data; struct request rq; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 2) printk (KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd); #endif /* IDETAPE_DEBUG_LOG */ #if IDETAPE_DEBUG_BUGS if (idetape_pipeline_active (tape)) { printk (KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n"); return (0); } #endif /* IDETAPE_DEBUG_BUGS */ ide_init_drive_cmd (&rq); rq.bh = bh; rq.cmd = cmd; rq.sector = tape->first_frame_position; rq.nr_sectors = rq.current_nr_sectors = blocks; if (tape->onstream) tape->postpone_cnt = 600; (void) ide_do_drive_cmd (drive, &rq, ide_wait); if (cmd != IDETAPE_READ_RQ && cmd != IDETAPE_WRITE_RQ) return 0; if (tape->merge_stage) idetape_init_merge_stage (tape); if (rq.errors == IDETAPE_ERROR_GENERAL) return -EIO; return (tape->tape_block_size * (blocks-rq.current_nr_sectors)); } /* * Read back the drive's internal buffer contents, as a part * of the write error recovery mechanism for old OnStream * firmware revisions. */ static void idetape_onstream_read_back_buffer (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; int frames, i, logical_blk_num; idetape_stage_t *stage, *first = NULL, *last = NULL; os_aux_t *aux; struct request *rq; unsigned char *p; unsigned long flags; idetape_update_stats(drive); frames = tape->cur_frames; logical_blk_num = ntohl(tape->first_stage->aux->logical_blk_num) - frames; printk(KERN_INFO "ide-tape: %s: reading back %d frames from the drive's internal buffer\n", tape->name, frames); for (i = 0; i < frames; i++) { stage = __idetape_kmalloc_stage(tape, 0, 0); if (!first) first = stage; aux = stage->aux; p = stage->bh->b_data; idetape_queue_rw_tail(drive, IDETAPE_READ_BUFFER_RQ, tape->capabilities.ctl, stage->bh); #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: read back logical block %d, data %x %x %x %x\n", tape->name, logical_blk_num, *p++, *p++, *p++, *p++); #endif rq = &stage->rq; ide_init_drive_cmd (rq); rq->cmd = IDETAPE_WRITE_RQ; rq->sector = tape->first_frame_position; rq->nr_sectors = rq->current_nr_sectors = tape->capabilities.ctl; idetape_init_stage(drive, stage, OS_FRAME_TYPE_DATA, logical_blk_num++); stage->next = NULL; if (last) last->next = stage; last = stage; } if (frames) { spin_lock_irqsave(&tape->spinlock, flags); last->next = tape->first_stage; tape->next_stage = tape->first_stage = first; tape->nr_stages += frames; tape->nr_pending_stages += frames; spin_unlock_irqrestore(&tape->spinlock, flags); } idetape_update_stats(drive); #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: frames left in buffer: %d\n", tape->name, tape->cur_frames); #endif } /* * Error recovery algorithm for the OnStream tape. */ static void idetape_onstream_write_error_recovery (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; unsigned int block; if (tape->onstream_write_error == 1) { printk(KERN_ERR "ide-tape: %s: detected physical bad block at %u\n", tape->name, ntohl(tape->sense.information)); block = ntohl(tape->sense.information) + 80; idetape_update_stats(drive); printk(KERN_ERR "ide-tape: %s: relocating %d buffered logical blocks to physical block %u\n", tape->name, tape->cur_frames, block); idetape_update_stats(drive); if (tape->firmware_revision_num >= 106) idetape_position_tape(drive, block, 0, 1); else { idetape_onstream_read_back_buffer(drive); idetape_position_tape(drive, block, 0, 0); } idetape_read_position(drive); #if ONSTREAM_DEBUG if (tape->debug_level >= 1) printk(KERN_ERR "ide-tape: %s: positioning complete, cur_frames %d, pos %d, tape pos %d\n", tape->name, tape->cur_frames, tape->first_frame_position, tape->last_frame_position); #endif } else if (tape->onstream_write_error == 2) { #if ONSTREAM_DEBUG if (tape->debug_level >= 1) printk(KERN_INFO "ide-tape: %s: skipping over config partition\n", tape->name); #endif idetape_flush_tape_buffers(drive); block = idetape_read_position(drive); if (block != 0xba4) printk(KERN_ERR "ide-tape: warning, current position %d, expected %d\n", block, 0xba4); idetape_position_tape(drive, 0xbb8, 0, 0); } tape->onstream_write_error = 0; } /* * idetape_insert_pipeline_into_queue is used to start servicing the * pipeline stages, starting from tape->next_stage. */ static void idetape_insert_pipeline_into_queue (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; if (tape->next_stage == NULL) return; if (!idetape_pipeline_active (tape)) { if (tape->onstream_write_error) idetape_onstream_write_error_recovery(drive); set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); idetape_active_next_stage (drive); (void) ide_do_drive_cmd (drive, tape->active_data_request, ide_end); } } static void idetape_create_inquiry_cmd (idetape_pc_t *pc) { idetape_init_pc(pc); pc->c[0] = IDETAPE_INQUIRY_CMD; pc->c[4] = pc->request_transfer = 254; pc->callback = &idetape_pc_callback; } static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc) { idetape_tape_t *tape = drive->driver_data; idetape_init_pc (pc); pc->c[0] = IDETAPE_REWIND_CMD; if (tape->onstream) pc->c[1] = 1; set_bit (PC_WAIT_FOR_DSC, &pc->flags); pc->callback = &idetape_pc_callback; } static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length) { idetape_init_pc (pc); set_bit (PC_WRITING, &pc->flags); pc->c[0] = IDETAPE_MODE_SELECT_CMD; pc->c[1] = 0x10; put_unaligned (htons(length), (unsigned short *) &pc->c[3]); pc->request_transfer = 255; pc->callback = &idetape_pc_callback; } static void idetape_create_erase_cmd (idetape_pc_t *pc) { idetape_init_pc (pc); pc->c[0] = IDETAPE_ERASE_CMD; pc->c[1] = 1; set_bit (PC_WAIT_FOR_DSC, &pc->flags); pc->callback = &idetape_pc_callback; } static void idetape_create_space_cmd (idetape_pc_t *pc,int count,byte cmd) { idetape_init_pc (pc); pc->c[0] = IDETAPE_SPACE_CMD; put_unaligned (htonl (count), (unsigned int *) &pc->c[1]); pc->c[1] = cmd; set_bit (PC_WAIT_FOR_DSC, &pc->flags); pc->callback = &idetape_pc_callback; } /* * Verify that we have the correct tape frame */ static int idetape_verify_stage (ide_drive_t *drive, idetape_stage_t *stage, int logical_blk_num, int quiet) { idetape_tape_t *tape = drive->driver_data; os_aux_t *aux = stage->aux; os_partition_t *par = &aux->partition; struct request *rq = &stage->rq; struct buffer_head *bh; if (!tape->onstream) return 1; if (tape->raw) { if (rq->errors) { bh = stage->bh; while (bh) { memset(bh->b_data, 0, bh->b_size); bh = bh->b_reqnext; } strcpy(stage->bh->b_data, "READ ERROR ON FRAME"); } return 1; } if (rq->errors == IDETAPE_ERROR_GENERAL) { printk(KERN_INFO "ide-tape: %s: skipping frame, read error\n", tape->name); return 0; } if (rq->errors == IDETAPE_ERROR_EOD) { printk(KERN_INFO "ide-tape: %s: skipping frame, eod\n", tape->name); return 0; } if (ntohl(aux->format_id) != 0) { printk(KERN_INFO "ide-tape: %s: skipping frame, format_id %u\n", tape->name, ntohl(aux->format_id)); return 0; } if (memcmp(aux->application_sig, tape->application_sig, 4) != 0) { printk(KERN_INFO "ide-tape: %s: skipping frame, incorrect application signature\n", tape->name); return 0; } if (aux->frame_type != OS_FRAME_TYPE_DATA && aux->frame_type != OS_FRAME_TYPE_EOD && aux->frame_type != OS_FRAME_TYPE_MARKER) { printk(KERN_INFO "ide-tape: %s: skipping frame, frame type %x\n", tape->name, aux->frame_type); return 0; } if (par->partition_num != OS_DATA_PARTITION) { if (!tape->linux_media || tape->linux_media_version != 2) { printk(KERN_INFO "ide-tape: %s: skipping frame, partition num %d\n", tape->name, par->partition_num); return 0; } } if (par->par_desc_ver != OS_PARTITION_VERSION) { printk(KERN_INFO "ide-tape: %s: skipping frame, partition version %d\n", tape->name, par->par_desc_ver); return 0; } if (ntohs(par->wrt_pass_cntr) != tape->wrt_pass_cntr) { printk(KERN_INFO "ide-tape: %s: skipping frame, wrt_pass_cntr %d (expected %d)(logical_blk_num %u)\n", tape->name, ntohs(par->wrt_pass_cntr), tape->wrt_pass_cntr, ntohl(aux->logical_blk_num)); return 0; } if (aux->frame_seq_num != aux->logical_blk_num) { printk(KERN_INFO "ide-tape: %s: skipping frame, seq != logical\n", tape->name); return 0; } if (logical_blk_num != -1 && ntohl(aux->logical_blk_num) != logical_blk_num) { if (!quiet) printk(KERN_INFO "ide-tape: %s: skipping frame, logical_blk_num %u (expected %d)\n", tape->name, ntohl(aux->logical_blk_num), logical_blk_num); return 0; } if (aux->frame_type == OS_FRAME_TYPE_MARKER) { rq->errors = IDETAPE_ERROR_FILEMARK; rq->current_nr_sectors = rq->nr_sectors; } return 1; } static void idetape_wait_first_stage (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; unsigned long flags; if (tape->first_stage == NULL) return; spin_lock_irqsave(&tape->spinlock, flags); if (tape->active_stage == tape->first_stage) idetape_wait_for_request(drive, tape->active_data_request); spin_unlock_irqrestore(&tape->spinlock, flags); } /* * idetape_add_chrdev_write_request tries to add a character device * originated write request to our pipeline. In case we don't succeed, * we revert to non-pipelined operation mode for this request. * * 1. Try to allocate a new pipeline stage. * 2. If we can't, wait for more and more requests to be serviced * and try again each time. * 3. If we still can't allocate a stage, fallback to * non-pipelined operation mode for this request. */ static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks) { idetape_tape_t *tape = drive->driver_data; idetape_stage_t *new_stage; unsigned long flags; struct request *rq; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 3) printk (KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n"); #endif /* IDETAPE_DEBUG_LOG */ /* * Attempt to allocate a new stage. * Pay special attention to possible race conditions. */ while ((new_stage = idetape_kmalloc_stage (tape)) == NULL) { spin_lock_irqsave(&tape->spinlock, flags); if (idetape_pipeline_active (tape)) { idetape_wait_for_request(drive, tape->active_data_request); spin_unlock_irqrestore(&tape->spinlock, flags); } else { spin_unlock_irqrestore(&tape->spinlock, flags); idetape_insert_pipeline_into_queue (drive); if (idetape_pipeline_active (tape)) continue; /* * Linux is short on memory. Fallback to * non-pipelined operation mode for this request. */ return idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, blocks, tape->merge_stage->bh); } } rq = &new_stage->rq; ide_init_drive_cmd (rq); rq->cmd = IDETAPE_WRITE_RQ; rq->sector = tape->first_frame_position; /* Doesn't actually matter - We always assume sequential access */ rq->nr_sectors = rq->current_nr_sectors = blocks; idetape_switch_buffers (tape, new_stage); idetape_init_stage(drive, new_stage, OS_FRAME_TYPE_DATA, tape->logical_blk_num); tape->logical_blk_num++; idetape_add_stage_tail (drive,new_stage); tape->pipeline_head++; #if USE_IOTRACE IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); #endif calculate_speeds(drive); /* * Estimate whether the tape has stopped writing by checking * if our write pipeline is currently empty. If we are not * writing anymore, wait for the pipeline to be full enough * (90%) before starting to service requests, so that we will * be able to keep up with the higher speeds of the tape. * * For the OnStream drive, we can query the number of pending * frames in the drive's internal buffer. As long as the tape * is still writing, it is better to write frames immediately * rather than gather them in the pipeline. This will give the * tape's firmware the ability to sense the current incoming * data rate more accurately, and since the OnStream tape * supports variable speeds, it can try to adjust itself to the * incoming data rate. */ if (!idetape_pipeline_active(tape)) { if (tape->nr_stages >= tape->max_stages * 9 / 10 || tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) { tape->measure_insert_time = 1; tape->insert_time = jiffies; tape->insert_size = 0; tape->insert_speed = 0; idetape_insert_pipeline_into_queue (drive); } else if (tape->onstream) { idetape_update_stats(drive); if (tape->cur_frames > 5) idetape_insert_pipeline_into_queue (drive); } } if (test_and_clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags)) /* Return a deferred error */ return -EIO; return blocks; } /* * idetape_wait_for_pipeline will wait until all pending pipeline * requests are serviced. Typically called on device close. */ static void idetape_wait_for_pipeline (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; unsigned long flags; while (tape->next_stage || idetape_pipeline_active(tape)) { idetape_insert_pipeline_into_queue (drive); spin_lock_irqsave(&tape->spinlock, flags); if (idetape_pipeline_active(tape)) idetape_wait_for_request(drive, tape->active_data_request); spin_unlock_irqrestore(&tape->spinlock, flags); } } static void idetape_empty_write_pipeline (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; int blocks, i, min; struct buffer_head *bh; #if IDETAPE_DEBUG_BUGS if (tape->chrdev_direction != idetape_direction_write) { printk (KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n"); return; } if (tape->merge_stage_size > tape->stage_size) { printk (KERN_ERR "ide-tape: bug: merge_buffer too big\n"); tape->merge_stage_size = tape->stage_size; } #endif /* IDETAPE_DEBUG_BUGS */ if (tape->merge_stage_size) { blocks=tape->merge_stage_size/tape->tape_block_size; if (tape->merge_stage_size % tape->tape_block_size) { blocks++; i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size; bh = tape->bh->b_reqnext; while (bh) { atomic_set(&bh->b_count, 0); bh = bh->b_reqnext; } bh = tape->bh; while (i) { if (bh == NULL) { printk(KERN_INFO "ide-tape: bug, bh NULL\n"); break; } min = IDE_MIN(i, bh->b_size - atomic_read(&bh->b_count)); memset(bh->b_data + atomic_read(&bh->b_count), 0, min); atomic_add(min, &bh->b_count); i -= min; bh = bh->b_reqnext; } } (void) idetape_add_chrdev_write_request (drive, blocks); tape->merge_stage_size = 0; } idetape_wait_for_pipeline (drive); if (tape->merge_stage != NULL) { __idetape_kfree_stage (tape->merge_stage); tape->merge_stage = NULL; } clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); tape->chrdev_direction=idetape_direction_none; /* * On the next backup, perform the feedback loop again. * (I don't want to keep sense information between backups, * as some systems are constantly on, and the system load * can be totally different on the next backup). */ tape->max_stages = tape->min_pipeline; #if IDETAPE_DEBUG_BUGS if (tape->first_stage != NULL || tape->next_stage != NULL || tape->last_stage != NULL || tape->nr_stages != 0) { printk (KERN_ERR "ide-tape: ide-tape pipeline bug, " "first_stage %p, next_stage %p, last_stage %p, nr_stages %d\n", tape->first_stage, tape->next_stage, tape->last_stage, tape->nr_stages); } #endif /* IDETAPE_DEBUG_BUGS */ } static void idetape_restart_speed_control (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; tape->restart_speed_control_req = 0; tape->pipeline_head = 0; tape->buffer_head = tape->tape_head = tape->cur_frames; tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0; tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0; tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000; tape->uncontrolled_pipeline_head_speed = 0; tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies; tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies; } static int idetape_initiate_read (ide_drive_t *drive, int max_stages) { idetape_tape_t *tape = drive->driver_data; idetape_stage_t *new_stage; struct request rq; int bytes_read; int blocks = tape->capabilities.ctl; if (tape->chrdev_direction != idetape_direction_read) { /* Initialize read operation */ if (tape->chrdev_direction == idetape_direction_write) { idetape_empty_write_pipeline (drive); idetape_flush_tape_buffers (drive); } #if IDETAPE_DEBUG_BUGS if (tape->merge_stage || tape->merge_stage_size) { printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); tape->merge_stage_size = 0; } #endif /* IDETAPE_DEBUG_BUGS */ if ((tape->merge_stage = __idetape_kmalloc_stage (tape, 0, 0)) == NULL) return -ENOMEM; tape->chrdev_direction = idetape_direction_read; tape->logical_blk_num = 0; /* * Issue a read 0 command to ensure that DSC handshake * is switched from completion mode to buffer available * mode. */ bytes_read = idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, 0, tape->merge_stage->bh); if (bytes_read < 0) { kfree (tape->merge_stage); tape->merge_stage = NULL; tape->chrdev_direction = idetape_direction_none; return bytes_read; } } if (tape->restart_speed_control_req) idetape_restart_speed_control(drive); ide_init_drive_cmd (&rq); rq.cmd = IDETAPE_READ_RQ; rq.sector = tape->first_frame_position; rq.nr_sectors = rq.current_nr_sectors = blocks; if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) && tape->nr_stages <= max_stages) { new_stage=idetape_kmalloc_stage (tape); while (new_stage != NULL) { new_stage->rq=rq; idetape_add_stage_tail (drive,new_stage); if (tape->nr_stages >= max_stages) break; new_stage=idetape_kmalloc_stage (tape); } } if (!idetape_pipeline_active(tape)) { if (tape->nr_pending_stages >= 3 * max_stages / 4) { tape->measure_insert_time = 1; tape->insert_time = jiffies; tape->insert_size = 0; tape->insert_speed = 0; idetape_insert_pipeline_into_queue (drive); } else if (tape->onstream) { idetape_update_stats(drive); if (tape->cur_frames < tape->max_frames - 5) idetape_insert_pipeline_into_queue (drive); } } return 0; } static int idetape_get_logical_blk (ide_drive_t *drive, int logical_blk_num, int max_stages, int quiet) { idetape_tape_t *tape = drive->driver_data; unsigned long flags; int cnt = 0, x, position; /* * Search and wait for the next logical tape block */ while (1) { if (cnt++ > 1000) { /* AJN: was 100 */ printk(KERN_INFO "ide-tape: %s: couldn't find logical block %d, aborting\n", tape->name, logical_blk_num); return 0; } idetape_initiate_read(drive, max_stages); if (tape->first_stage == NULL) { if (tape->onstream) { #if ONSTREAM_DEBUG if (tape->debug_level >= 1) printk(KERN_INFO "ide-tape: %s: first_stage == NULL, pipeline error %ld\n", tape->name, (long)test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)); #endif clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); position = idetape_read_position(drive); if (position >= 3000 && position < 3080) position += 32; if (position >= 2980 && position < 3000) position = 3000; else position += 60; if (position >= 2980 && position < 3000) position = 3000; printk(KERN_INFO "ide-tape: %s: blank block detected, positioning tape to block %d\n", tape->name, position); idetape_position_tape(drive, position, 0, 1); cnt += 40; continue; } else return 0; } idetape_wait_first_stage(drive); if (idetape_verify_stage(drive, tape->first_stage, logical_blk_num, quiet)) break; if (tape->first_stage->rq.errors == IDETAPE_ERROR_EOD) cnt--; if (idetape_verify_stage(drive, tape->first_stage, -1, quiet)) { x = ntohl(tape->first_stage->aux->logical_blk_num); if (x > logical_blk_num) { printk(KERN_ERR "ide-tape: %s: couldn't find logical block %d, aborting (block %d found)\n", tape->name, logical_blk_num, x); return 0; } } spin_lock_irqsave(&tape->spinlock, flags); idetape_remove_stage_head(drive); spin_unlock_irqrestore(&tape->spinlock, flags); } if (tape->onstream) tape->logical_blk_num = ntohl(tape->first_stage->aux->logical_blk_num); return 1; } /* * idetape_add_chrdev_read_request is called from idetape_chrdev_read * to service a character device read request and add read-ahead * requests to our pipeline. */ static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks) { idetape_tape_t *tape = drive->driver_data; unsigned long flags; struct request *rq_ptr; int bytes_read; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks); #endif /* IDETAPE_DEBUG_LOG */ /* * Wait for the next logical block to be available at the head * of the pipeline */ if (!idetape_get_logical_blk(drive, tape->logical_blk_num, tape->max_stages, 0)) { if (tape->onstream) { set_bit(IDETAPE_READ_ERROR, &tape->flags); return 0; } if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) return 0; return idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, blocks, tape->merge_stage->bh); } rq_ptr = &tape->first_stage->rq; bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors); rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0; if (tape->onstream && !tape->raw && tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) { #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: EOD reached\n", tape->name); #endif return 0; } if (rq_ptr->errors == IDETAPE_ERROR_EOD) return 0; else if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) set_bit (IDETAPE_FILEMARK, &tape->flags); else { idetape_switch_buffers (tape, tape->first_stage); if (rq_ptr->errors == IDETAPE_ERROR_GENERAL) { #if ONSTREAM_DEBUG if (tape->debug_level >= 1) printk(KERN_INFO "ide-tape: error detected, bytes_read %d\n", bytes_read); #endif } clear_bit (IDETAPE_FILEMARK, &tape->flags); spin_lock_irqsave(&tape->spinlock, flags); idetape_remove_stage_head (drive); spin_unlock_irqrestore(&tape->spinlock, flags); tape->logical_blk_num++; tape->pipeline_head++; #if USE_IOTRACE IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); #endif calculate_speeds(drive); } #if IDETAPE_DEBUG_BUGS if (bytes_read > blocks*tape->tape_block_size) { printk (KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n"); bytes_read=blocks*tape->tape_block_size; } #endif /* IDETAPE_DEBUG_BUGS */ return (bytes_read); } static void idetape_pad_zeros (ide_drive_t *drive, int bcount) { idetape_tape_t *tape = drive->driver_data; struct buffer_head *bh; int count, blocks; while (bcount) { bh = tape->merge_stage->bh; count = IDE_MIN (tape->stage_size, bcount); bcount -= count; blocks = count / tape->tape_block_size; while (count) { atomic_set(&bh->b_count, IDE_MIN (count, bh->b_size)); memset (bh->b_data, 0, atomic_read(&bh->b_count)); count -= atomic_read(&bh->b_count); bh = bh->b_reqnext; } idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, blocks, tape->merge_stage->bh); } } static int idetape_pipeline_size (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; idetape_stage_t *stage; struct request *rq; int size = 0; idetape_wait_for_pipeline (drive); stage = tape->first_stage; while (stage != NULL) { rq = &stage->rq; size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors); if (rq->errors == IDETAPE_ERROR_FILEMARK) size += tape->tape_block_size; stage = stage->next; } size += tape->merge_stage_size; return size; } /* * Rewinds the tape to the Beginning Of the current Partition (BOP). * * We currently support only one partition. */ static int idetape_rewind_tape (ide_drive_t *drive) { int retval; idetape_pc_t pc; idetape_tape_t *tape = drive->driver_data; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 2) printk (KERN_INFO "ide-tape: Reached idetape_rewind_tape\n"); #endif /* IDETAPE_DEBUG_LOG */ idetape_create_rewind_cmd (drive, &pc); retval=idetape_queue_pc_tail (drive,&pc); if (retval) return retval; idetape_create_read_position_cmd (&pc); retval = idetape_queue_pc_tail (drive,&pc); if (retval) return retval; tape->logical_blk_num = 0; return 0; } /* * Our special ide-tape ioctl's. * * Currently there aren't any ioctl's. * mtio.h compatible commands should be issued to the character device * interface. */ static int idetape_blkdev_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { idetape_tape_t *tape = drive->driver_data; idetape_config_t config; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 4) printk (KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n"); #endif /* IDETAPE_DEBUG_LOG */ switch (cmd) { case 0x0340: if (copy_from_user ((char *) &config, (char *) arg, sizeof (idetape_config_t))) return -EFAULT; tape->best_dsc_rw_frequency = config.dsc_rw_frequency; tape->max_stages = config.nr_stages; break; case 0x0350: config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency; config.nr_stages = tape->max_stages; if (copy_to_user ((char *) arg, (char *) &config, sizeof (idetape_config_t))) return -EFAULT; break; default: return -EIO; } return 0; } /* * The block device interface should not be used for data transfers. * However, we still allow opening it so that we can issue general * ide driver configuration ioctl's, such as the interrupt unmask feature. */ static int idetape_blkdev_open (struct inode *inode, struct file *filp, ide_drive_t *drive) { MOD_INC_USE_COUNT; #if ONSTREAM_DEBUG printk(KERN_INFO "ide-tape: MOD_INC_USE_COUNT in idetape_blkdev_open\n"); #endif return 0; } static void idetape_blkdev_release (struct inode *inode, struct file *filp, ide_drive_t *drive) { MOD_DEC_USE_COUNT; #if ONSTREAM_DEBUG printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_blkdev_release\n"); #endif } /* * idetape_pre_reset is called before an ATAPI/ATA software reset. */ static void idetape_pre_reset (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; if (tape != NULL) set_bit (IDETAPE_IGNORE_DSC, &tape->flags); } /* * Character device interface functions */ static ide_drive_t *get_drive_ptr (kdev_t i_rdev) { unsigned int i = MINOR(i_rdev) & ~0xc0; if (i >= MAX_HWIFS * MAX_DRIVES) return NULL; return (idetape_chrdevs[i].drive); } static int idetape_onstream_space_over_filemarks_backward (ide_drive_t *drive,short mt_op,int mt_count) { idetape_tape_t *tape = drive->driver_data; int cnt = 0; int last_mark_addr; unsigned long flags; if (!idetape_get_logical_blk(drive, -1, 10, 0)) { printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_bwd\n", tape->name); return -EIO; } while (cnt != mt_count) { last_mark_addr = ntohl(tape->first_stage->aux->last_mark_addr); if (last_mark_addr == -1) return -EIO; #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: positioning to last mark at %d\n", last_mark_addr); #endif idetape_position_tape(drive, last_mark_addr, 0, 0); cnt++; if (!idetape_get_logical_blk(drive, -1, 10, 0)) { printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks\n", tape->name); return -EIO; } if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_MARKER) { printk(KERN_INFO "ide-tape: %s: expected to find marker at block %d, not found\n", tape->name, last_mark_addr); return -EIO; } } if (mt_op == MTBSFM) { spin_lock_irqsave(&tape->spinlock, flags); idetape_remove_stage_head (drive); tape->logical_blk_num++; spin_unlock_irqrestore(&tape->spinlock, flags); } return 0; } /* * ADRL 1.1 compatible "slow" space filemarks fwd version * * Just scans for the filemark sequentially. */ static int idetape_onstream_space_over_filemarks_forward_slow (ide_drive_t *drive,short mt_op,int mt_count) { idetape_tape_t *tape = drive->driver_data; int cnt = 0; unsigned long flags; if (!idetape_get_logical_blk(drive, -1, 10, 0)) { printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_fwd\n", tape->name); return -EIO; } while (1) { if (!idetape_get_logical_blk(drive, -1, 10, 0)) { printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks\n", tape->name); return -EIO; } if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_MARKER) cnt++; if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) { #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: space_fwd: EOD reached\n", tape->name); #endif return -EIO; } if (cnt == mt_count) break; spin_lock_irqsave(&tape->spinlock, flags); idetape_remove_stage_head (drive); spin_unlock_irqrestore(&tape->spinlock, flags); } if (mt_op == MTFSF) { spin_lock_irqsave(&tape->spinlock, flags); idetape_remove_stage_head (drive); tape->logical_blk_num++; spin_unlock_irqrestore(&tape->spinlock, flags); } return 0; } /* * Fast linux specific version of OnStream FSF */ static int idetape_onstream_space_over_filemarks_forward_fast (ide_drive_t *drive,short mt_op,int mt_count) { idetape_tape_t *tape = drive->driver_data; int cnt = 0, next_mark_addr; unsigned long flags; if (!idetape_get_logical_blk(drive, -1, 10, 0)) { printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_fwd\n", tape->name); return -EIO; } /* * Find nearest (usually previous) marker */ while (1) { if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_MARKER) break; if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) { #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: space_fwd: EOD reached\n", tape->name); #endif return -EIO; } if (ntohl(tape->first_stage->aux->filemark_cnt) == 0) { if (tape->first_mark_addr == -1) { printk(KERN_INFO "ide-tape: %s: reverting to slow filemark space\n", tape->name); return idetape_onstream_space_over_filemarks_forward_slow(drive, mt_op, mt_count); } idetape_position_tape(drive, tape->first_mark_addr, 0, 0); if (!idetape_get_logical_blk(drive, -1, 10, 0)) { printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_fwd_fast\n", tape->name); return -EIO; } if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_MARKER) { printk(KERN_INFO "ide-tape: %s: expected to find filemark at %d\n", tape->name, tape->first_mark_addr); return -EIO; } } else { if (idetape_onstream_space_over_filemarks_backward(drive, MTBSF, 1) < 0) return -EIO; mt_count++; } } cnt++; while (cnt != mt_count) { next_mark_addr = ntohl(tape->first_stage->aux->next_mark_addr); if (!next_mark_addr || next_mark_addr > tape->eod_frame_addr) { printk(KERN_INFO "ide-tape: %s: reverting to slow filemark space\n", tape->name); return idetape_onstream_space_over_filemarks_forward_slow(drive, mt_op, mt_count - cnt); #if ONSTREAM_DEBUG } else if (tape->debug_level >= 2) { printk(KERN_INFO "ide-tape: positioning to next mark at %d\n", next_mark_addr); #endif } idetape_position_tape(drive, next_mark_addr, 0, 0); cnt++; if (!idetape_get_logical_blk(drive, -1, 10, 0)) { printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks\n", tape->name); return -EIO; } if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_MARKER) { printk(KERN_INFO "ide-tape: %s: expected to find marker at block %d, not found\n", tape->name, next_mark_addr); return -EIO; } } if (mt_op == MTFSF) { spin_lock_irqsave(&tape->spinlock, flags); idetape_remove_stage_head (drive); tape->logical_blk_num++; spin_unlock_irqrestore(&tape->spinlock, flags); } return 0; } /* * idetape_space_over_filemarks is now a bit more complicated than just * passing the command to the tape since we may have crossed some * filemarks during our pipelined read-ahead mode. * * As a minor side effect, the pipeline enables us to support MTFSFM when * the filemark is in our internal pipeline even if the tape doesn't * support spacing over filemarks in the reverse direction. */ static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count) { idetape_tape_t *tape = drive->driver_data; idetape_pc_t pc; unsigned long flags; int retval,count=0; int speed_control; if (tape->onstream) { if (tape->raw) return -EIO; speed_control = tape->speed_control; tape->speed_control = 0; if (mt_op == MTFSF || mt_op == MTFSFM) { if (tape->linux_media) retval = idetape_onstream_space_over_filemarks_forward_fast(drive, mt_op, mt_count); else retval = idetape_onstream_space_over_filemarks_forward_slow(drive, mt_op, mt_count); } else retval = idetape_onstream_space_over_filemarks_backward(drive, mt_op, mt_count); tape->speed_control = speed_control; tape->restart_speed_control_req = 1; return retval; } if (tape->chrdev_direction == idetape_direction_read) { /* * We have a read-ahead buffer. Scan it for crossed * filemarks. */ tape->merge_stage_size = 0; clear_bit (IDETAPE_FILEMARK, &tape->flags); while (tape->first_stage != NULL) { idetape_wait_first_stage(drive); if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK) count++; if (count == mt_count) { switch (mt_op) { case MTFSF: spin_lock_irqsave(&tape->spinlock, flags); idetape_remove_stage_head (drive); spin_unlock_irqrestore(&tape->spinlock, flags); case MTFSFM: return (0); default: break; } } spin_lock_irqsave(&tape->spinlock, flags); idetape_remove_stage_head (drive); spin_unlock_irqrestore(&tape->spinlock, flags); } idetape_discard_read_pipeline (drive, 1); } /* * The filemark was not found in our internal pipeline. * Now we can issue the space command. */ switch (mt_op) { case MTFSF: idetape_create_space_cmd (&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK); return (idetape_queue_pc_tail (drive,&pc)); case MTFSFM: if (!tape->capabilities.sprev) return (-EIO); retval = idetape_space_over_filemarks (drive, MTFSF, mt_count-count); if (retval) return (retval); return (idetape_space_over_filemarks (drive, MTBSF, 1)); case MTBSF: if (!tape->capabilities.sprev) return (-EIO); idetape_create_space_cmd (&pc,-(mt_count+count),IDETAPE_SPACE_OVER_FILEMARK); return (idetape_queue_pc_tail (drive,&pc)); case MTBSFM: if (!tape->capabilities.sprev) return (-EIO); retval = idetape_space_over_filemarks (drive, MTBSF, mt_count+count); if (retval) return (retval); return (idetape_space_over_filemarks (drive, MTFSF, 1)); default: printk (KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); return (-EIO); } } /* * Our character device read / write functions. * * The tape is optimized to maximize throughput when it is transferring * an integral number of the "continuous transfer limit", which is * a parameter of the specific tape (26 KB on my particular tape). * (32 kB for Onstream) * * As of version 1.3 of the driver, the character device provides an * abstract continuous view of the media - any mix of block sizes (even 1 * byte) on the same backup/restore procedure is supported. The driver * will internally convert the requests to the recommended transfer unit, * so that an unmatch between the user's block size to the recommended * size will only result in a (slightly) increased driver overhead, but * will no longer hit performance. * This is not applicable to Onstream. */ static ssize_t idetape_chrdev_read (struct file *file, char *buf, size_t count, loff_t *ppos) { struct inode *inode = file->f_dentry->d_inode; ide_drive_t *drive = get_drive_ptr (inode->i_rdev); idetape_tape_t *tape = drive->driver_data; ssize_t bytes_read,temp,actually_read=0, rc; if (ppos != &file->f_pos) { /* "A request was outside the capabilities of the device." */ return -ENXIO; } if (tape->onstream && (count != tape->tape_block_size)) { printk(KERN_ERR "ide-tape: %s: use %d bytes as block size (%Zd used)\n", tape->name, tape->tape_block_size, count); return -EINVAL; } #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 3) printk (KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count); #endif /* IDETAPE_DEBUG_LOG */ if (tape->chrdev_direction != idetape_direction_read) { if (test_bit (IDETAPE_DETECT_BS, &tape->flags)) if (count > tape->tape_block_size && (count % tape->tape_block_size) == 0) tape->user_bs_factor = count / tape->tape_block_size; } if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0) return rc; if (count==0) return (0); if (tape->merge_stage_size) { actually_read=IDE_MIN (tape->merge_stage_size,count); idetape_copy_stage_to_user (tape, buf, tape->merge_stage, actually_read); buf += actually_read; tape->merge_stage_size -= actually_read; count-=actually_read; } while (count >= tape->stage_size) { bytes_read=idetape_add_chrdev_read_request (drive, tape->capabilities.ctl); if (bytes_read <= 0) goto finish; idetape_copy_stage_to_user (tape, buf, tape->merge_stage, bytes_read); buf += bytes_read; count -= bytes_read; actually_read += bytes_read; } if (count) { bytes_read=idetape_add_chrdev_read_request (drive, tape->capabilities.ctl); if (bytes_read <= 0) goto finish; temp=IDE_MIN (count,bytes_read); idetape_copy_stage_to_user (tape, buf, tape->merge_stage, temp); actually_read+=temp; tape->merge_stage_size=bytes_read-temp; } finish: if (!actually_read && test_bit (IDETAPE_FILEMARK, &tape->flags)) { #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name); #endif idetape_space_over_filemarks (drive, MTFSF, 1); return 0; } if (tape->onstream && !actually_read && test_and_clear_bit(IDETAPE_READ_ERROR, &tape->flags)) { printk(KERN_ERR "ide-tape: %s: unrecovered read error on logical block number %d, skipping\n", tape->name, tape->logical_blk_num); tape->logical_blk_num++; return -EIO; } return actually_read; } static void idetape_update_last_marker (ide_drive_t *drive, int last_mark_addr, int next_mark_addr) { idetape_tape_t *tape = drive->driver_data; idetape_stage_t *stage; os_aux_t *aux; int position; if (!tape->onstream || tape->raw) return; if (last_mark_addr == -1) return; stage = __idetape_kmalloc_stage(tape, 0, 0); if (stage == NULL) return; idetape_flush_tape_buffers(drive); position = idetape_read_position(drive); #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: current position (2) %d, lblk %d\n", position, tape->logical_blk_num); if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: current position (2) tape block %d\n", tape->last_frame_position); #endif idetape_position_tape(drive, last_mark_addr, 0, 0); if (!idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, 1, stage->bh)) { printk(KERN_INFO "ide-tape: %s: couldn't read last marker\n", tape->name); __idetape_kfree_stage (stage); idetape_position_tape(drive, position, 0, 0); return; } aux = stage->aux; if (aux->frame_type != OS_FRAME_TYPE_MARKER) { printk(KERN_INFO "ide-tape: %s: expected to find marker at addr %d\n", tape->name, last_mark_addr); __idetape_kfree_stage (stage); idetape_position_tape(drive, position, 0, 0); return; } #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: writing back marker\n"); #endif aux->next_mark_addr = htonl(next_mark_addr); idetape_position_tape(drive, last_mark_addr, 0, 0); if (!idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 1, stage->bh)) { printk(KERN_INFO "ide-tape: %s: couldn't write back marker frame at %d\n", tape->name, last_mark_addr); __idetape_kfree_stage (stage); idetape_position_tape(drive, position, 0, 0); return; } __idetape_kfree_stage (stage); idetape_flush_tape_buffers (drive); idetape_position_tape(drive, position, 0, 0); return; } static void __idetape_write_header (ide_drive_t *drive, int block, int cnt) { idetape_tape_t *tape = drive->driver_data; idetape_stage_t *stage; os_header_t header; stage = __idetape_kmalloc_stage(tape, 1, 1); if (stage == NULL) return; idetape_init_stage(drive, stage, OS_FRAME_TYPE_HEADER, tape->logical_blk_num); idetape_wait_ready(drive, 60 * 5 * HZ); idetape_position_tape(drive, block, 0, 0); memset(&header, 0, sizeof(header)); strcpy(header.ident_str, "ADR_SEQ"); header.major_rev = 1; header.minor_rev = 2; header.par_num = 1; header.partition.partition_num = OS_DATA_PARTITION; header.partition.par_desc_ver = OS_PARTITION_VERSION; header.partition.first_frame_addr = htonl(0x14); header.partition.last_frame_addr = htonl(19239 * 24); header.partition.wrt_pass_cntr = htons(tape->wrt_pass_cntr); header.partition.eod_frame_addr = htonl(tape->eod_frame_addr); memcpy(stage->bh->b_data, &header, sizeof(header)); while (cnt--) { if (!idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 1, stage->bh)) { printk(KERN_INFO "ide-tape: %s: couldn't write header frame\n", tape->name); __idetape_kfree_stage (stage); return; } } __idetape_kfree_stage (stage); idetape_flush_tape_buffers (drive); } static void idetape_write_header (ide_drive_t *drive, int locate_eod) { idetape_tape_t *tape = drive->driver_data; #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: writing tape header\n", tape->name); #endif if (!tape->onstream || tape->raw) return; tape->update_frame_cntr++; __idetape_write_header(drive, 5, 5); __idetape_write_header(drive, 0xbae, 5); if (locate_eod) { #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: locating back to eod frame addr %d\n", tape->name, tape->eod_frame_addr); #endif idetape_position_tape(drive, tape->eod_frame_addr, 0, 0); } } static ssize_t idetape_chrdev_write (struct file *file, const char *buf, size_t count, loff_t *ppos) { struct inode *inode = file->f_dentry->d_inode; ide_drive_t *drive = get_drive_ptr (inode->i_rdev); idetape_tape_t *tape = drive->driver_data; ssize_t retval,actually_written=0; int position; if (ppos != &file->f_pos) { /* "A request was outside the capabilities of the device." */ return -ENXIO; } if (tape->onstream && (count != tape->tape_block_size)) { printk(KERN_ERR "ide-tape: %s: use %d bytes as block size (%Zd used)\n", tape->name, tape->tape_block_size, count); return -EINVAL; } #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 3) printk (KERN_INFO "ide-tape: Reached idetape_chrdev_write, count %Zd\n", count); #endif /* IDETAPE_DEBUG_LOG */ if (tape->chrdev_direction != idetape_direction_write) { /* Initialize write operation */ if (tape->chrdev_direction == idetape_direction_read) idetape_discard_read_pipeline (drive, 1); #if IDETAPE_DEBUG_BUGS if (tape->merge_stage || tape->merge_stage_size) { printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); tape->merge_stage_size = 0; } #endif /* IDETAPE_DEBUG_BUGS */ if ((tape->merge_stage = __idetape_kmalloc_stage (tape, 0, 0)) == NULL) return -ENOMEM; tape->chrdev_direction = idetape_direction_write; idetape_init_merge_stage (tape); if (tape->onstream) { position = idetape_read_position(drive); if (position <= 20) { tape->logical_blk_num = 0; tape->wrt_pass_cntr++; #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: logical block num 0, setting eod to 20\n", tape->name); if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: allocating new write pass counter %d\n", tape->name, tape->wrt_pass_cntr); #endif tape->filemark_cnt = 0; tape->eod_frame_addr = 20; tape->first_mark_addr = tape->last_mark_addr = -1; idetape_write_header(drive, 1); } #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: positioning tape to eod at %d\n", tape->name, tape->eod_frame_addr); #endif position = idetape_read_position(drive); if (position != tape->eod_frame_addr) idetape_position_tape(drive, tape->eod_frame_addr, 0, 0); #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: first_frame_position %d\n", tape->name, tape->first_frame_position); #endif } /* * Issue a write 0 command to ensure that DSC handshake * is switched from completion mode to buffer available * mode. */ retval = idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 0, tape->merge_stage->bh); if (retval < 0) { kfree (tape->merge_stage); tape->merge_stage = NULL; tape->chrdev_direction = idetape_direction_none; return retval; } #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk("ide-tape: first_frame_position %d\n", tape->first_frame_position); #endif } if (count==0) return (0); if (tape->restart_speed_control_req) idetape_restart_speed_control(drive); if (tape->merge_stage_size) { #if IDETAPE_DEBUG_BUGS if (tape->merge_stage_size >= tape->stage_size) { printk (KERN_ERR "ide-tape: bug: merge buffer too big\n"); tape->merge_stage_size=0; } #endif /* IDETAPE_DEBUG_BUGS */ actually_written=IDE_MIN (tape->stage_size-tape->merge_stage_size,count); idetape_copy_stage_from_user (tape, tape->merge_stage, buf, actually_written); buf+=actually_written;tape->merge_stage_size+=actually_written;count-=actually_written; if (tape->merge_stage_size == tape->stage_size) { tape->merge_stage_size = 0; retval=idetape_add_chrdev_write_request (drive, tape->capabilities.ctl); if (retval <= 0) return (retval); } } while (count >= tape->stage_size) { idetape_copy_stage_from_user (tape, tape->merge_stage, buf, tape->stage_size); buf+=tape->stage_size;count-=tape->stage_size; retval=idetape_add_chrdev_write_request (drive, tape->capabilities.ctl); actually_written+=tape->stage_size; if (retval <= 0) return (retval); } if (count) { actually_written+=count; idetape_copy_stage_from_user (tape, tape->merge_stage, buf, count); tape->merge_stage_size+=count; } return (actually_written); } static int idetape_write_filemark (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; int last_mark_addr; idetape_pc_t pc; if (!tape->onstream) { idetape_create_write_filemark_cmd(drive, &pc,1); /* Write a filemark */ if (idetape_queue_pc_tail (drive,&pc)) { printk (KERN_ERR "ide-tape: Couldn't write a filemark\n"); return -EIO; } } else if (!tape->raw) { last_mark_addr = idetape_read_position(drive); tape->merge_stage = __idetape_kmalloc_stage (tape, 1, 0); if (tape->merge_stage != NULL) { idetape_init_stage(drive, tape->merge_stage, OS_FRAME_TYPE_MARKER, tape->logical_blk_num); idetape_pad_zeros (drive, tape->stage_size); tape->logical_blk_num++; __idetape_kfree_stage (tape->merge_stage); tape->merge_stage = NULL; } if (tape->filemark_cnt) idetape_update_last_marker(drive, tape->last_mark_addr, last_mark_addr); tape->last_mark_addr = last_mark_addr; if (tape->filemark_cnt++ == 0) tape->first_mark_addr = last_mark_addr; } return 0; } static void idetape_write_eod (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; if (!tape->onstream || tape->raw) return; tape->merge_stage = __idetape_kmalloc_stage (tape, 1, 0); if (tape->merge_stage != NULL) { tape->eod_frame_addr = idetape_read_position(drive); idetape_init_stage(drive, tape->merge_stage, OS_FRAME_TYPE_EOD, tape->logical_blk_num); idetape_pad_zeros (drive, tape->stage_size); __idetape_kfree_stage (tape->merge_stage); tape->merge_stage = NULL; } return; } int idetape_seek_logical_blk (ide_drive_t *drive, int logical_blk_num) { idetape_tape_t *tape = drive->driver_data; int estimated_address = logical_blk_num + 20; int retries = 0; int speed_control; speed_control = tape->speed_control; tape->speed_control = 0; if (logical_blk_num < 0) logical_blk_num = 0; if (idetape_get_logical_blk(drive, logical_blk_num, 10, 1)) goto ok; while (++retries < 10) { idetape_discard_read_pipeline(drive, 0); idetape_position_tape(drive, estimated_address, 0, 0); if (idetape_get_logical_blk(drive, logical_blk_num, 10, 1)) goto ok; if (!idetape_get_logical_blk(drive, -1, 10, 1)) goto error; if (tape->logical_blk_num < logical_blk_num) estimated_address += logical_blk_num - tape->logical_blk_num; else break; } error: tape->speed_control = speed_control; tape->restart_speed_control_req = 1; printk(KERN_INFO "ide-tape: %s: couldn't seek to logical block %d (at %d), %d retries\n", tape->name, logical_blk_num, tape->logical_blk_num, retries); return -EIO; ok: tape->speed_control = speed_control; tape->restart_speed_control_req = 1; return 0; } /* * idetape_mtioctop is called from idetape_chrdev_ioctl when * the general mtio MTIOCTOP ioctl is requested. * * We currently support the following mtio.h operations: * * MTFSF - Space over mt_count filemarks in the positive direction. * The tape is positioned after the last spaced filemark. * * MTFSFM - Same as MTFSF, but the tape is positioned before the * last filemark. * * MTBSF - Steps background over mt_count filemarks, tape is * positioned before the last filemark. * * MTBSFM - Like MTBSF, only tape is positioned after the last filemark. * * Note: * * MTBSF and MTBSFM are not supported when the tape doesn't * supports spacing over filemarks in the reverse direction. * In this case, MTFSFM is also usually not supported (it is * supported in the rare case in which we crossed the filemark * during our read-ahead pipelined operation mode). * * MTWEOF - Writes mt_count filemarks. Tape is positioned after * the last written filemark. * * MTREW - Rewinds tape. * * MTLOAD - Loads the tape. * * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and * MTUNLOAD prevents further access until the media is replaced. * * MTNOP - Flushes tape buffers. * * MTRETEN - Retension media. This typically consists of one end * to end pass on the media. * * MTEOM - Moves to the end of recorded data. * * MTERASE - Erases tape. * * MTSETBLK - Sets the user block size to mt_count bytes. If * mt_count is 0, we will attempt to autodetect * the block size. * * MTSEEK - Positions the tape in a specific block number, where * each block is assumed to contain which user_block_size * bytes. * * MTSETPART - Switches to another tape partition. * * MTLOCK - Locks the tape door. * * MTUNLOCK - Unlocks the tape door. * * The following commands are currently not supported: * * MTFSS, MTBSS, MTWSM, MTSETDENSITY, * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD. */ static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count) { idetape_tape_t *tape = drive->driver_data; idetape_pc_t pc; int i,retval; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 1) printk (KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",mt_op,mt_count); #endif /* IDETAPE_DEBUG_LOG */ /* * Commands which need our pipelined read-ahead stages. */ switch (mt_op) { case MTFSF: case MTFSFM: case MTBSF: case MTBSFM: if (!mt_count) return (0); return (idetape_space_over_filemarks (drive,mt_op,mt_count)); default: break; } switch (mt_op) { case MTWEOF: idetape_discard_read_pipeline (drive, 1); for (i = 0; i < mt_count; i++) { retval = idetape_write_filemark(drive); if (retval) return retval; } return (0); case MTREW: idetape_discard_read_pipeline (drive, 0); if (idetape_rewind_tape(drive)) return -EIO; if (tape->onstream && !tape->raw) return idetape_position_tape(drive, 20, 0, 0); return 0; case MTLOAD: idetape_discard_read_pipeline (drive, 0); idetape_create_load_unload_cmd (drive, &pc, IDETAPE_LU_LOAD_MASK); return (idetape_queue_pc_tail (drive,&pc)); case MTUNLOAD: case MTOFFL: idetape_discard_read_pipeline (drive, 0); idetape_create_load_unload_cmd (drive, &pc,!IDETAPE_LU_LOAD_MASK); return (idetape_queue_pc_tail (drive,&pc)); case MTNOP: idetape_discard_read_pipeline (drive, 0); return (idetape_flush_tape_buffers (drive)); case MTRETEN: idetape_discard_read_pipeline (drive, 0); idetape_create_load_unload_cmd (drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); return (idetape_queue_pc_tail (drive,&pc)); case MTEOM: if (tape->onstream) { #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: positioning tape to eod at %d\n", tape->name, tape->eod_frame_addr); #endif idetape_position_tape(drive, tape->eod_frame_addr, 0, 0); if (!idetape_get_logical_blk(drive, -1, 10, 0)) return -EIO; if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_EOD) return -EIO; return 0; } idetape_create_space_cmd (&pc,0,IDETAPE_SPACE_TO_EOD); return (idetape_queue_pc_tail (drive,&pc)); case MTERASE: if (tape->onstream) { tape->eod_frame_addr = 20; tape->logical_blk_num = 0; tape->first_mark_addr = tape->last_mark_addr = -1; idetape_position_tape(drive, tape->eod_frame_addr, 0, 0); idetape_write_eod(drive); idetape_flush_tape_buffers (drive); idetape_write_header(drive, 0); idetape_flush_tape_buffers (drive); (void) idetape_rewind_tape (drive); return 0; } (void) idetape_rewind_tape (drive); idetape_create_erase_cmd (&pc); return (idetape_queue_pc_tail (drive,&pc)); case MTSETBLK: if (tape->onstream) { if (mt_count != tape->tape_block_size) { printk(KERN_INFO "ide-tape: %s: MTSETBLK %d -- only %d bytes block size supported\n", tape->name, mt_count, tape->tape_block_size); return -EINVAL; } return 0; } if (mt_count) { if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size) return -EIO; tape->user_bs_factor = mt_count / tape->tape_block_size; clear_bit (IDETAPE_DETECT_BS, &tape->flags); } else set_bit (IDETAPE_DETECT_BS, &tape->flags); return 0; case MTSEEK: if (!tape->onstream || tape->raw) { idetape_discard_read_pipeline (drive, 0); return idetape_position_tape (drive, mt_count * tape->user_bs_factor, tape->partition, 0); } return idetape_seek_logical_blk(drive, mt_count); case MTSETPART: idetape_discard_read_pipeline (drive, 0); if (tape->onstream) return -EIO; return (idetape_position_tape (drive, 0, mt_count, 0)); case MTFSR: case MTBSR: if (tape->onstream) { if (!idetape_get_logical_blk(drive, -1, 10, 0)) return -EIO; if (mt_op == MTFSR) return idetape_seek_logical_blk(drive, tape->logical_blk_num + mt_count); else { idetape_discard_read_pipeline (drive, 0); return idetape_seek_logical_blk(drive, tape->logical_blk_num - mt_count); } } case MTLOCK: if (!idetape_create_prevent_cmd(drive, &pc, 1)) return 0; retval = idetape_queue_pc_tail (drive,&pc); if (retval) return retval; tape->door_locked = DOOR_EXPLICITLY_LOCKED; return 0; case MTUNLOCK: if (!idetape_create_prevent_cmd(drive, &pc, 0)) return 0; retval = idetape_queue_pc_tail (drive,&pc); if (retval) return retval; tape->door_locked = DOOR_UNLOCKED; return 0; default: printk (KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); return (-EIO); } } /* * Our character device ioctls. * * General mtio.h magnetic io commands are supported here, and not in * the corresponding block interface. * * The following ioctls are supported: * * MTIOCTOP - Refer to idetape_mtioctop for detailed description. * * MTIOCGET - The mt_dsreg field in the returned mtget structure * will be set to (user block size in bytes << * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK. * * The mt_blkno is set to the current user block number. * The other mtget fields are not supported. * * MTIOCPOS - The current tape "block position" is returned. We * assume that each block contains user_block_size * bytes. * * Our own ide-tape ioctls are supported on both interfaces. */ static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { ide_drive_t *drive = get_drive_ptr (inode->i_rdev); idetape_tape_t *tape = drive->driver_data; struct mtop mtop; struct mtget mtget; struct mtpos mtpos; int block_offset = 0, position = tape->first_frame_position; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 3) printk (KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, cmd=%u\n",cmd); #endif /* IDETAPE_DEBUG_LOG */ tape->restart_speed_control_req = 1; if (tape->chrdev_direction == idetape_direction_write) { idetape_empty_write_pipeline (drive); idetape_flush_tape_buffers (drive); } if (cmd == MTIOCGET || cmd == MTIOCPOS) { block_offset = idetape_pipeline_size (drive) / (tape->tape_block_size * tape->user_bs_factor); if ((position = idetape_read_position(drive)) < 0) return -EIO; } switch (cmd) { case MTIOCTOP: if (copy_from_user ((char *) &mtop, (char *) arg, sizeof (struct mtop))) return -EFAULT; return (idetape_mtioctop (drive,mtop.mt_op,mtop.mt_count)); case MTIOCGET: memset (&mtget, 0, sizeof (struct mtget)); mtget.mt_type = MT_ISSCSI2; if (!tape->onstream || tape->raw) mtget.mt_blkno = position / tape->user_bs_factor - block_offset; else { if (!idetape_get_logical_blk(drive, -1, 10, 0)) mtget.mt_blkno = -1; else mtget.mt_blkno = tape->logical_blk_num; } mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; if (tape->onstream) { mtget.mt_gstat |= GMT_ONLINE(0xffffffff); if (tape->first_stage && tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) mtget.mt_gstat |= GMT_EOD(0xffffffff); if (position <= 20) mtget.mt_gstat |= GMT_BOT(0xffffffff); } if (copy_to_user ((char *) arg,(char *) &mtget, sizeof (struct mtget))) return -EFAULT; return 0; case MTIOCPOS: if (tape->onstream && !tape->raw) { if (!idetape_get_logical_blk(drive, -1, 10, 0)) return -EIO; mtpos.mt_blkno = tape->logical_blk_num; } else mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; if (copy_to_user ((char *) arg,(char *) &mtpos, sizeof (struct mtpos))) return -EFAULT; return 0; default: if (tape->chrdev_direction == idetape_direction_read) idetape_discard_read_pipeline (drive, 1); return (idetape_blkdev_ioctl (drive,inode,file,cmd,arg)); } } static int __idetape_analyze_headers (ide_drive_t *drive, int block) { idetape_tape_t *tape = drive->driver_data; idetape_stage_t *stage; os_header_t *header; os_aux_t *aux; if (!tape->onstream || tape->raw) { tape->header_ok = tape->linux_media = 1; return 1; } tape->header_ok = tape->linux_media = 0; tape->update_frame_cntr = 0; tape->wrt_pass_cntr = 0; tape->eod_frame_addr = 20; tape->first_mark_addr = tape->last_mark_addr = -1; stage = __idetape_kmalloc_stage (tape, 0, 0); if (stage == NULL) return 0; #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: reading header\n", tape->name); #endif idetape_position_tape(drive, block, 0, 0); if (!idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, 1, stage->bh)) { printk(KERN_INFO "ide-tape: %s: couldn't read header frame\n", tape->name); __idetape_kfree_stage (stage); return 0; } header = (os_header_t *) stage->bh->b_data; aux = stage->aux; if (strncmp(header->ident_str, "ADR_SEQ", 7) != 0) { printk(KERN_INFO "ide-tape: %s: invalid header identification string\n", tape->name); __idetape_kfree_stage (stage); return 0; } if (header->major_rev != 1 || (header->minor_rev != 1 && header->minor_rev != 2)) printk(KERN_INFO "ide-tape: warning: revision %d.%d detected (1.1/1.2 supported)\n", header->major_rev, header->minor_rev); if (header->par_num != 1) printk(KERN_INFO "ide-tape: warning: %d partitions defined, only one supported\n", header->par_num); tape->wrt_pass_cntr = ntohs(header->partition.wrt_pass_cntr); tape->eod_frame_addr = ntohl(header->partition.eod_frame_addr); tape->filemark_cnt = ntohl(aux->filemark_cnt); tape->first_mark_addr = ntohl(aux->next_mark_addr); tape->last_mark_addr = ntohl(aux->last_mark_addr); tape->update_frame_cntr = ntohl(aux->update_frame_cntr); memcpy(tape->application_sig, aux->application_sig, 4); tape->application_sig[4] = 0; if (memcmp(tape->application_sig, "LIN", 3) == 0) { tape->linux_media = 1; tape->linux_media_version = tape->application_sig[3] - '0'; if (tape->linux_media_version != 3) printk(KERN_INFO "ide-tape: %s: Linux media version %d detected (current 3)\n", tape->name, tape->linux_media_version); } else { printk(KERN_INFO "ide-tape: %s: non Linux media detected (%s)\n", tape->name, tape->application_sig); tape->linux_media = 0; } #if ONSTREAM_DEBUG if (tape->debug_level >= 2) printk(KERN_INFO "ide-tape: %s: detected write pass counter %d, eod frame addr %d\n", tape->name, tape->wrt_pass_cntr, tape->eod_frame_addr); #endif __idetape_kfree_stage (stage); return 1; } static int idetape_analyze_headers (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; int position, block; if (!tape->onstream || tape->raw) { tape->header_ok = tape->linux_media = 1; return 1; } tape->header_ok = tape->linux_media = 0; position = idetape_read_position(drive); for (block = 5; block < 10; block++) if (__idetape_analyze_headers(drive, block)) goto ok; #if 0 for (block = 0xbae; block < 0xbb8; block++) #else for (block = 0xbae; block < 0xbb3; block++) #endif if (__idetape_analyze_headers(drive, block)) goto ok; printk(KERN_ERR "ide-tape: %s: failed to find valid ADRL header\n", tape->name); return 0; ok: if (position < 20) position = 20; idetape_position_tape(drive, position, 0, 0); tape->header_ok = 1; return 1; } /* * Our character device open function. */ static int idetape_chrdev_open (struct inode *inode, struct file *filp) { ide_drive_t *drive; idetape_tape_t *tape; idetape_pc_t pc; unsigned int minor=MINOR (inode->i_rdev); #if IDETAPE_DEBUG_LOG printk (KERN_INFO "ide-tape: Reached idetape_chrdev_open\n"); #endif /* IDETAPE_DEBUG_LOG */ if ((drive = get_drive_ptr (inode->i_rdev)) == NULL) return -ENXIO; tape = drive->driver_data; if (test_and_set_bit (IDETAPE_BUSY, &tape->flags)) return -EBUSY; if (!tape->onstream) { idetape_read_position(drive); if (!test_bit (IDETAPE_ADDRESS_VALID, &tape->flags)) (void) idetape_rewind_tape (drive); } else { if (minor & 64) { tape->tape_block_size = tape->stage_size = 32768 + 512; tape->raw = 1; } else { tape->tape_block_size = tape->stage_size = 32768; tape->raw = 0; } } if (idetape_wait_ready(drive, 60 * HZ)) { clear_bit(IDETAPE_BUSY, &tape->flags); printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); return -EBUSY; } idetape_read_position(drive); clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); if (tape->chrdev_direction == idetape_direction_none) { if (idetape_create_prevent_cmd(drive, &pc, 1)) { if (!idetape_queue_pc_tail (drive,&pc)) { if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) tape->door_locked = DOOR_LOCKED; } } idetape_analyze_headers(drive); } tape->max_frames = tape->cur_frames = tape->req_buffer_fill = 0; idetape_restart_speed_control(drive); tape->restart_speed_control_req = 0; return 0; } /* * Our character device release function. */ static int idetape_chrdev_release (struct inode *inode, struct file *filp) { ide_drive_t *drive = get_drive_ptr (inode->i_rdev); idetape_tape_t *tape; idetape_pc_t pc; unsigned int minor=MINOR (inode->i_rdev); lock_kernel(); tape = drive->driver_data; #if IDETAPE_DEBUG_LOG if (tape->debug_level >= 3) printk (KERN_INFO "ide-tape: Reached idetape_chrdev_release\n"); #endif /* IDETAPE_DEBUG_LOG */ if (tape->chrdev_direction == idetape_direction_write) { idetape_empty_write_pipeline (drive); tape->merge_stage = __idetape_kmalloc_stage (tape, 1, 0); if (tape->merge_stage != NULL) { idetape_pad_zeros (drive, tape->tape_block_size * (tape->user_bs_factor - 1)); __idetape_kfree_stage (tape->merge_stage); tape->merge_stage = NULL; } idetape_write_filemark(drive); idetape_write_eod(drive); idetape_flush_tape_buffers (drive); idetape_write_header(drive, minor >= 128); idetape_flush_tape_buffers (drive); } if (tape->chrdev_direction == idetape_direction_read) { if (minor < 128) idetape_discard_read_pipeline (drive, 1); else idetape_wait_for_pipeline (drive); } if (tape->cache_stage != NULL) { __idetape_kfree_stage (tape->cache_stage); tape->cache_stage = NULL; } if (minor < 128) (void) idetape_rewind_tape (drive); if (tape->chrdev_direction == idetape_direction_none) { if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) { if (idetape_create_prevent_cmd(drive, &pc, 0)) if (!idetape_queue_pc_tail (drive,&pc)) tape->door_locked = DOOR_UNLOCKED; } } clear_bit (IDETAPE_BUSY, &tape->flags); unlock_kernel(); return 0; } /* * idetape_identify_device is called to check the contents of the * ATAPI IDENTIFY command results. We return: * * 1 If the tape can be supported by us, based on the information * we have so far. * * 0 If this tape driver is not currently supported by us. */ static int idetape_identify_device (ide_drive_t *drive,struct hd_driveid *id) { struct idetape_id_gcw gcw; #if IDETAPE_DEBUG_INFO unsigned short mask,i; #endif /* IDETAPE_DEBUG_INFO */ if (!id) return 0; *((unsigned short *) &gcw) = id->config; #if IDETAPE_DEBUG_INFO printk (KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n"); printk (KERN_INFO "ide-tape: Protocol Type: "); switch (gcw.protocol) { case 0: case 1: printk (KERN_INFO "ATA\n");break; case 2: printk (KERN_INFO "ATAPI\n");break; case 3: printk (KERN_INFO "Reserved (Unknown to ide-tape)\n");break; } printk (KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type); switch (gcw.device_type) { case 0: printk (KERN_INFO "Direct-access Device\n");break; case 1: printk (KERN_INFO "Streaming Tape Device\n");break; case 2: case 3: case 4: printk (KERN_INFO "Reserved\n");break; case 5: printk (KERN_INFO "CD-ROM Device\n");break; case 6: printk (KERN_INFO "Reserved\n"); case 7: printk (KERN_INFO "Optical memory Device\n");break; case 0x1f: printk (KERN_INFO "Unknown or no Device type\n");break; default: printk (KERN_INFO "Reserved\n"); } printk (KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n"); printk (KERN_INFO "ide-tape: Command Packet DRQ Type: "); switch (gcw.drq_type) { case 0: printk (KERN_INFO "Microprocessor DRQ\n");break; case 1: printk (KERN_INFO "Interrupt DRQ\n");break; case 2: printk (KERN_INFO "Accelerated DRQ\n");break; case 3: printk (KERN_INFO "Reserved\n");break; } printk (KERN_INFO "ide-tape: Command Packet Size: "); switch (gcw.packet_size) { case 0: printk (KERN_INFO "12 bytes\n");break; case 1: printk (KERN_INFO "16 bytes\n");break; default: printk (KERN_INFO "Reserved\n");break; } printk (KERN_INFO "ide-tape: Model: %.40s\n",id->model); printk (KERN_INFO "ide-tape: Firmware Revision: %.8s\n",id->fw_rev); printk (KERN_INFO "ide-tape: Serial Number: %.20s\n",id->serial_no); printk (KERN_INFO "ide-tape: Write buffer size: %d bytes\n",id->buf_size*512); printk (KERN_INFO "ide-tape: DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n"); printk (KERN_INFO "ide-tape: LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n"); printk (KERN_INFO "ide-tape: IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n"); printk (KERN_INFO "ide-tape: IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n"); printk (KERN_INFO "ide-tape: ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n"); printk (KERN_INFO "ide-tape: PIO Cycle Timing Category: %d\n",id->tPIO); printk (KERN_INFO "ide-tape: DMA Cycle Timing Category: %d\n",id->tDMA); printk (KERN_INFO "ide-tape: Single Word DMA supported modes: "); for (i=0,mask=1;i<8;i++,mask=mask << 1) { if (id->dma_1word & mask) printk (KERN_INFO "%d ",i); if (id->dma_1word & (mask << 8)) printk (KERN_INFO "(active) "); } printk (KERN_INFO "\n"); printk (KERN_INFO "ide-tape: Multi Word DMA supported modes: "); for (i=0,mask=1;i<8;i++,mask=mask << 1) { if (id->dma_mword & mask) printk (KERN_INFO "%d ",i); if (id->dma_mword & (mask << 8)) printk (KERN_INFO "(active) "); } printk (KERN_INFO "\n"); if (id->field_valid & 0x0002) { printk (KERN_INFO "ide-tape: Enhanced PIO Modes: %s\n",id->eide_pio_modes & 1 ? "Mode 3":"None"); printk (KERN_INFO "ide-tape: Minimum Multi-word DMA cycle per word: "); if (id->eide_dma_min == 0) printk (KERN_INFO "Not supported\n"); else printk (KERN_INFO "%d ns\n",id->eide_dma_min); printk (KERN_INFO "ide-tape: Manufacturer\'s Recommended Multi-word cycle: "); if (id->eide_dma_time == 0) printk (KERN_INFO "Not supported\n"); else printk (KERN_INFO "%d ns\n",id->eide_dma_time); printk (KERN_INFO "ide-tape: Minimum PIO cycle without IORDY: "); if (id->eide_pio == 0) printk (KERN_INFO "Not supported\n"); else printk (KERN_INFO "%d ns\n",id->eide_pio); printk (KERN_INFO "ide-tape: Minimum PIO cycle with IORDY: "); if (id->eide_pio_iordy == 0) printk (KERN_INFO "Not supported\n"); else printk (KERN_INFO "%d ns\n",id->eide_pio_iordy); } else printk (KERN_INFO "ide-tape: According to the device, fields 64-70 are not valid.\n"); #endif /* IDETAPE_DEBUG_INFO */ /* Check that we can support this device */ if (gcw.protocol !=2 ) printk (KERN_ERR "ide-tape: Protocol is not ATAPI\n"); else if (gcw.device_type != 1) printk (KERN_ERR "ide-tape: Device type is not set to tape\n"); else if (!gcw.removable) printk (KERN_ERR "ide-tape: The removable flag is not set\n"); else if (gcw.packet_size != 0) { printk (KERN_ERR "ide-tape: Packet size is not 12 bytes long\n"); if (gcw.packet_size == 1) printk (KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n"); } else return 1; return 0; } /* * Notify vendor ID to the OnStream tape drive */ static void idetape_onstream_set_vendor (ide_drive_t *drive, char *vendor) { idetape_pc_t pc; idetape_mode_parameter_header_t *header; idetape_create_mode_select_cmd(&pc, sizeof(*header) + 8); pc.buffer[0] = 3 + 8; /* Mode Data Length */ pc.buffer[1] = 0; /* Medium Type - ignoring */ pc.buffer[2] = 0; /* Reserved */ pc.buffer[3] = 0; /* Block Descriptor Length */ pc.buffer[4 + 0] = 0x36 | (1 << 7); pc.buffer[4 + 1] = 6; pc.buffer[4 + 2] = vendor[0]; pc.buffer[4 + 3] = vendor[1]; pc.buffer[4 + 4] = vendor[2]; pc.buffer[4 + 5] = vendor[3]; pc.buffer[4 + 6] = 0; pc.buffer[4 + 7] = 0; if (idetape_queue_pc_tail (drive,&pc)) printk (KERN_ERR "ide-tape: Couldn't set vendor name to %s\n", vendor); } /* * Various unused OnStream commands */ #if ONSTREAM_DEBUG static void idetape_onstream_set_retries (ide_drive_t *drive, int retries) { idetape_pc_t pc; idetape_create_mode_select_cmd(&pc, sizeof(idetape_mode_parameter_header_t) + 4); pc.buffer[0] = 3 + 4; pc.buffer[1] = 0; /* Medium Type - ignoring */ pc.buffer[2] = 0; /* Reserved */ pc.buffer[3] = 0; /* Block Descriptor Length */ pc.buffer[4 + 0] = 0x2f | (1 << 7); pc.buffer[4 + 1] = 2; pc.buffer[4 + 2] = 4; pc.buffer[4 + 3] = retries; if (idetape_queue_pc_tail (drive,&pc)) printk (KERN_ERR "ide-tape: Couldn't set retries to %d\n", retries); } #endif /* * Configure 32.5KB block size. */ static void idetape_onstream_configure_block_size (ide_drive_t *drive) { idetape_pc_t pc; idetape_mode_parameter_header_t *header; idetape_block_size_page_t *bs; /* * Get the current block size from the block size mode page */ idetape_create_mode_sense_cmd (&pc,IDETAPE_BLOCK_SIZE_PAGE); if (idetape_queue_pc_tail (drive,&pc)) printk (KERN_ERR "ide-tape: can't get tape block size mode page\n"); header = (idetape_mode_parameter_header_t *) pc.buffer; bs = (idetape_block_size_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); #if IDETAPE_DEBUG_INFO printk(KERN_INFO "ide-tape: 32KB play back: %s\n", bs->play32 ? "Yes" : "No"); printk(KERN_INFO "ide-tape: 32.5KB play back: %s\n", bs->play32_5 ? "Yes" : "No"); printk(KERN_INFO "ide-tape: 32KB record: %s\n", bs->record32 ? "Yes" : "No"); printk(KERN_INFO "ide-tape: 32.5KB record: %s\n", bs->record32_5 ? "Yes" : "No"); #endif /* IDETAPE_DEBUG_INFO */ /* * Configure default auto columns mode, 32.5KB block size */ bs->one = 1; bs->play32 = 0; bs->play32_5 = 1; bs->record32 = 0; bs->record32_5 = 1; idetape_create_mode_select_cmd(&pc, sizeof(*header) + sizeof(*bs)); if (idetape_queue_pc_tail (drive,&pc)) printk (KERN_ERR "ide-tape: Couldn't set tape block size mode page\n"); #if ONSTREAM_DEBUG /* * In debug mode, we want to see as many errors as possible * to test the error recovery mechanism. */ idetape_onstream_set_retries(drive, 0); #endif } /* * Use INQUIRY to get the firmware revision */ static void idetape_get_inquiry_results (ide_drive_t *drive) { char *r; idetape_tape_t *tape = drive->driver_data; idetape_pc_t pc; idetape_inquiry_result_t *inquiry; idetape_create_inquiry_cmd(&pc); if (idetape_queue_pc_tail (drive,&pc)) { printk (KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name); return; } inquiry = (idetape_inquiry_result_t *) pc.buffer; memcpy(tape->vendor_id, inquiry->vendor_id, 8); memcpy(tape->product_id, inquiry->product_id, 16); memcpy(tape->firmware_revision, inquiry->revision_level, 4); ide_fixstring(tape->vendor_id, 10, 0); ide_fixstring(tape->product_id, 18, 0); ide_fixstring(tape->firmware_revision, 6, 0); r = tape->firmware_revision; if (*(r + 1) == '.') tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0'; else if (tape->onstream) tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 1) - '0') * 10 + *(r + 2) - '0'; printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", drive->name, tape->name, tape->vendor_id, tape->product_id, tape->firmware_revision); } /* * Configure the OnStream ATAPI tape drive for default operation */ static void idetape_configure_onstream (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; if (tape->firmware_revision_num < 105) { printk(KERN_INFO "ide-tape: %s: Old OnStream firmware revision detected (%s)\n", tape->name, tape->firmware_revision); printk(KERN_INFO "ide-tape: %s: An upgrade to version 1.05 or above is recommended\n", tape->name); } /* * Configure 32.5KB (data+aux) block size. */ idetape_onstream_configure_block_size(drive); /* * Set vendor name to 'LIN3' for "Linux support version 3". */ idetape_onstream_set_vendor(drive, "LIN3"); } /* * idetape_get_mode_sense_results asks the tape about its various * parameters. In particular, we will adjust our data transfer buffer * size to the recommended value as returned by the tape. */ static void idetape_get_mode_sense_results (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; idetape_pc_t pc; idetape_mode_parameter_header_t *header; idetape_capabilities_page_t *capabilities; idetape_create_mode_sense_cmd (&pc,IDETAPE_CAPABILITIES_PAGE); if (idetape_queue_pc_tail (drive,&pc)) { printk (KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n"); tape->tape_block_size = 512; tape->capabilities.ctl = 52; tape->capabilities.speed = 450; tape->capabilities.buffer_size = 6 * 52; return; } header = (idetape_mode_parameter_header_t *) pc.buffer; capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); capabilities->max_speed = ntohs (capabilities->max_speed); capabilities->ctl = ntohs (capabilities->ctl); capabilities->speed = ntohs (capabilities->speed); capabilities->buffer_size = ntohs (capabilities->buffer_size); if (!capabilities->speed) { printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name); capabilities->speed = 650; } if (!capabilities->max_speed) { printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name); capabilities->max_speed = 650; } tape->capabilities = *capabilities; /* Save us a copy */ if (capabilities->blk512) tape->tape_block_size = 512; else if (capabilities->blk1024) tape->tape_block_size = 1024; else if (tape->onstream && capabilities->blk32768) tape->tape_block_size = 32768; #if IDETAPE_DEBUG_INFO printk (KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n"); printk (KERN_INFO "ide-tape: Mode Parameter Header:\n"); printk (KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length); printk (KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type); printk (KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp); printk (KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl); printk (KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n"); printk (KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code); printk (KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length); printk (KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No"); printk (KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No"); printk (KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No"); printk (KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No"); printk (KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No"); printk (KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No"); printk (KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No"); printk (KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No"); printk (KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No"); printk (KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No"); printk (KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No"); printk (KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No"); printk (KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No"); printk (KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed); printk (KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl); printk (KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed); printk (KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512); #endif /* IDETAPE_DEBUG_INFO */ } static void idetape_add_settings (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; /* * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function */ ide_add_setting(drive, "buffer", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL); ide_add_setting(drive, "pipeline_min", SETTING_RW, -1, -1, TYPE_INT, 2, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL); ide_add_setting(drive, "pipeline", SETTING_RW, -1, -1, TYPE_INT, 2, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL); ide_add_setting(drive, "pipeline_max", SETTING_RW, -1, -1, TYPE_INT, 2, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL); ide_add_setting(drive, "pipeline_used",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL); ide_add_setting(drive, "pipeline_pending",SETTING_READ,-1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL); ide_add_setting(drive, "speed", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL); ide_add_setting(drive, "stage", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL); ide_add_setting(drive, "tdsc", SETTING_RW, -1, -1, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL); ide_add_setting(drive, "dsc_overlap", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL); ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL); ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed, NULL); ide_add_setting(drive, "avg_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL); if (tape->onstream) { ide_add_setting(drive, "cur_frames", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->cur_frames, NULL); ide_add_setting(drive, "max_frames", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->max_frames, NULL); ide_add_setting(drive, "insert_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->insert_speed, NULL); ide_add_setting(drive, "speed_control",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->speed_control, NULL); ide_add_setting(drive, "debug_level",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL); ide_add_setting(drive, "tape_still_time",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->tape_still_time, NULL); ide_add_setting(drive, "max_insert_speed",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->max_insert_speed, NULL); ide_add_setting(drive, "insert_size", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->insert_size, NULL); } } /* * ide_setup is called to: * * 1. Initialize our various state variables. * 2. Ask the tape for its capabilities. * 3. Allocate a buffer which will be used for data * transfer. The buffer size is chosen based on * the recommendation which we received in step (2). * * Note that at this point ide.c already assigned us an irq, so that * we can queue requests here and wait for their completion. */ static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor) { unsigned long t1, tmid, tn, t; int speed; struct idetape_id_gcw gcw; int stage_size; memset (tape, 0, sizeof (idetape_tape_t)); spin_lock_init(&tape->spinlock); drive->driver_data = tape; drive->ready_stat = 0; /* An ATAPI device ignores DRDY */ if (strstr(drive->id->model, "OnStream DI-30")) tape->onstream = 1; drive->dsc_overlap = 1; #ifdef CONFIG_BLK_DEV_IDEPCI if (!tape->onstream && HWIF(drive)->pci_dev != NULL) { /* * These two ide-pci host adapters appear to need DSC overlap disabled. * This probably needs further analysis. */ if ((HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) || (HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_TTI_HPT343)) { printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", tape->name); drive->dsc_overlap = 0; } } #endif /* CONFIG_BLK_DEV_IDEPCI */ tape->drive = drive; tape->minor = minor; tape->name[0] = 'h'; tape->name[1] = 't'; tape->name[2] = '0' + minor; tape->chrdev_direction = idetape_direction_none; tape->pc = tape->pc_stack; tape->max_insert_speed = 10000; tape->speed_control = 1; *((unsigned short *) &gcw) = drive->id->config; if (gcw.drq_type == 1) set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags); tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10; idetape_get_inquiry_results(drive); idetape_get_mode_sense_results(drive); if (tape->onstream) idetape_configure_onstream(drive); tape->user_bs_factor = 1; tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; while (tape->stage_size > 0xffff) { printk (KERN_NOTICE "ide-tape: decreasing stage size\n"); tape->capabilities.ctl /= 2; tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; } stage_size = tape->stage_size; if (tape->onstream) stage_size = 32768 + 512; tape->pages_per_stage = stage_size / PAGE_SIZE; if (stage_size % PAGE_SIZE) { tape->pages_per_stage++; tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE; } /* * Select the "best" DSC read/write polling frequency * and pipeline size. */ speed = IDE_MAX (tape->capabilities.speed, tape->capabilities.max_speed); tape->max_stages = speed * 1000 * 10 / tape->stage_size; tape->min_pipeline = tape->max_stages; tape->max_pipeline = tape->max_stages * 2; t1 = (tape->stage_size * HZ) / (speed * 1000); tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125); tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000); if (tape->max_stages) t = tn; else t = t1; /* * Ensure that the number we got makes sense; limit * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. */ tape->best_dsc_rw_frequency = IDE_MAX (IDE_MIN (t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN); printk (KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, %dkB pipeline, %lums tDSC%s\n", drive->name, tape->name, tape->capabilities.speed, (tape->capabilities.buffer_size * 512) / tape->stage_size, tape->stage_size / 1024, tape->max_stages * tape->stage_size / 1024, tape->best_dsc_rw_frequency * 1000 / HZ, drive->using_dma ? ", DMA":""); idetape_add_settings(drive); } static int idetape_cleanup (ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; int minor = tape->minor; unsigned long flags; save_flags (flags); /* all CPUs (overkill?) */ cli(); /* all CPUs (overkill?) */ if (test_bit (IDETAPE_BUSY, &tape->flags) || tape->first_stage != NULL || tape->merge_stage_size || drive->usage) { restore_flags(flags); /* all CPUs (overkill?) */ return 1; } idetape_chrdevs[minor].drive = NULL; restore_flags (flags); /* all CPUs (overkill?) */ DRIVER(drive)->busy = 0; (void) ide_unregister_subdriver (drive); drive->driver_data = NULL; devfs_unregister (tape->de_r); devfs_unregister (tape->de_n); kfree (tape); for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++) if (idetape_chrdevs[minor].drive != NULL) return 0; devfs_unregister_chrdev (IDETAPE_MAJOR, "ht"); idetape_chrdev_present = 0; return 0; } #ifdef CONFIG_PROC_FS static int proc_idetape_read_name (char *page, char **start, off_t off, int count, int *eof, void *data) { ide_drive_t *drive = (ide_drive_t *) data; idetape_tape_t *tape = drive->driver_data; char *out = page; int len; len = sprintf(out,"%s\n", tape->name); PROC_IDE_READ_RETURN(page,start,off,count,eof,len); } static ide_proc_entry_t idetape_proc[] = { { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, { NULL, 0, NULL, NULL } }; #else #define idetape_proc NULL #endif /* * IDE subdriver functions, registered with ide.c */ static ide_driver_t idetape_driver = { name: "ide-tape", version: IDETAPE_VERSION, media: ide_tape, busy: 1, supports_dma: 1, supports_dsc_overlap: 1, cleanup: idetape_cleanup, do_request: idetape_do_request, end_request: idetape_end_request, ioctl: idetape_blkdev_ioctl, open: idetape_blkdev_open, release: idetape_blkdev_release, pre_reset: idetape_pre_reset, proc: idetape_proc, }; int idetape_init (void); static ide_module_t idetape_module = { IDE_DRIVER_MODULE, idetape_init, &idetape_driver, NULL }; /* * Our character device supporting functions, passed to register_chrdev. */ static struct file_operations idetape_fops = { owner: THIS_MODULE, read: idetape_chrdev_read, write: idetape_chrdev_write, ioctl: idetape_chrdev_ioctl, open: idetape_chrdev_open, release: idetape_chrdev_release, }; /* * idetape_init will register the driver for each tape. */ int idetape_init (void) { ide_drive_t *drive; idetape_tape_t *tape; int minor, failed = 0, supported = 0; MOD_INC_USE_COUNT; #if ONSTREAM_DEBUG printk(KERN_INFO "ide-tape: MOD_INC_USE_COUNT in idetape_init\n"); #endif if (!idetape_chrdev_present) for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++ ) idetape_chrdevs[minor].drive = NULL; if ((drive = ide_scan_devices (ide_tape, idetape_driver.name, NULL, failed++)) == NULL) { ide_register_module (&idetape_module); MOD_DEC_USE_COUNT; #if ONSTREAM_DEBUG printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_init\n"); #endif return 0; } if (!idetape_chrdev_present && devfs_register_chrdev (IDETAPE_MAJOR, "ht", &idetape_fops)) { printk (KERN_ERR "ide-tape: Failed to register character device interface\n"); MOD_DEC_USE_COUNT; #if ONSTREAM_DEBUG printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_init\n"); #endif return -EBUSY; } do { if (!idetape_identify_device (drive, drive->id)) { printk (KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name); continue; } if (drive->scsi) { if (strstr(drive->id->model, "OnStream DI-30")) { printk("ide-tape: ide-scsi emulation is not supported for %s.\n", drive->id->model); } else { printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name); continue; } } tape = (idetape_tape_t *) kmalloc (sizeof (idetape_tape_t), GFP_KERNEL); if (tape == NULL) { printk (KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name); continue; } if (ide_register_subdriver (drive, &idetape_driver, IDE_SUBDRIVER_VERSION)) { printk (KERN_ERR "ide-tape: %s: Failed to register the driver with ide.c\n", drive->name); kfree (tape); continue; } for (minor = 0; idetape_chrdevs[minor].drive != NULL; minor++); idetape_setup (drive, tape, minor); idetape_chrdevs[minor].drive = drive; tape->de_r = devfs_register (drive->de, "mt", DEVFS_FL_DEFAULT, HWIF(drive)->major, minor, S_IFCHR | S_IRUGO | S_IWUGO, &idetape_fops, NULL); tape->de_n = devfs_register (drive->de, "mtn", DEVFS_FL_DEFAULT, HWIF(drive)->major, minor + 128, S_IFCHR | S_IRUGO | S_IWUGO, &idetape_fops, NULL); devfs_register_tape (tape->de_r); supported++; failed--; } while ((drive = ide_scan_devices (ide_tape, idetape_driver.name, NULL, failed++)) != NULL); if (!idetape_chrdev_present && !supported) { devfs_unregister_chrdev (IDETAPE_MAJOR, "ht"); } else idetape_chrdev_present = 1; ide_register_module (&idetape_module); MOD_DEC_USE_COUNT; #if ONSTREAM_DEBUG printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_init\n"); #endif return 0; } #ifdef MODULE int init_module (void) { return idetape_init (); } void cleanup_module (void) { ide_drive_t *drive; int minor; for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++) { drive = idetape_chrdevs[minor].drive; if (drive != NULL && idetape_cleanup (drive)) printk (KERN_ERR "ide-tape: %s: cleanup_module() called while still busy\n", drive->name); } ide_unregister_module(&idetape_module); } #endif /* MODULE */