/* * File...........: linux/drivers/s390/block/dasd.c * Author(s)......: Holger Smolinski * Bugreports.to..: * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000 * * History of changes (starts July 2000) */ #ifndef DASD_H #define DASD_H #include #include #define IOCTL_LETTER 'D' /* Disable the volume (for Linux) */ #define BIODASDDISABLE _IO(IOCTL_LETTER,0) /* Enable the volume (for Linux) */ #define BIODASDENABLE _IO(IOCTL_LETTER,1) /* Issue a reserve/release command, rsp. */ #define BIODASDRSRV _IO(IOCTL_LETTER,2) /* reserve */ #define BIODASDRLSE _IO(IOCTL_LETTER,3) /* release */ #define BIODASDSLCK _IO(IOCTL_LETTER,4) /* steal lock */ /* Read sense ID infpormation */ #define BIODASDRSID _IOR(IOCTL_LETTER,0,senseid_t) /* Format the volume or an extent */ #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) /* translate blocknumber of partition to absolute */ #define BIODASDRWTB _IOWR(IOCTL_LETTER,0,int) #define DASD_NAME "dasd" #define DASD_PARTN_BITS 2 #define DASD_PER_MAJOR ( 1U<<(MINORBITS-DASD_PARTN_BITS)) /* * struct format_data_t * represents all data necessary to format a dasd */ typedef struct format_data_t { int start_unit; /* from track */ int stop_unit; /* to track */ int blksize; /* sectorsize */ int intensity; /* 0: normal, 1:record zero, 3:home address, 4 invalidate tracks */ } __attribute__ ((packed)) format_data_t; #define DASD_FORMAT_DEFAULT_START_UNIT 0 #define DASD_FORMAT_DEFAULT_STOP_UNIT -1 #define DASD_FORMAT_DEFAULT_BLOCKSIZE -1 #define DASD_FORMAT_DEFAULT_INTENSITY -1 #ifdef __KERNEL__ #include #include #include #include #include #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,3,98)) #include #include #endif #include #include #include #include #include #include /* Kernel Version Compatibility section */ #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,3,98)) typedef struct request *request_queue_t; #define block_device_operations file_operations #define __setup(x,y) struct dasd_device_t #define devfs_register_blkdev(major,name,ops) register_blkdev(major,name,ops) #define register_disk(dd,dev,partn,ops,size) \ do { \ dd->sizes[MINOR(dev)] = size >> 1; \ resetup_one_dev(dd,MINOR(dev)>>DASD_PARTN_BITS); \ } while(0) #define init_waitqueue_head(x) do { *x = NULL; } while(0) #define blk_cleanup_queue(x) do {} while(0) #define blk_init_queue(x...) do {} while(0) #define blk_queue_headactive(x...) do {} while(0) #define blk_queue_make_request(x) do {} while(0) #define list_empty(x) (0) #define INIT_BLK_DEV(d_major,d_request_fn,d_queue_fn,d_current) \ do { \ blk_dev[d_major].request_fn = d_request_fn; \ blk_dev[d_major].queue = d_queue_fn; \ blk_dev[d_major].current_request = d_current; \ } while(0) #define INIT_GENDISK(D_MAJOR,D_NAME,D_PARTN_BITS,D_PER_MAJOR) \ major:D_MAJOR, \ major_name:D_NAME, \ minor_shift:D_PARTN_BITS, \ max_p:1 << D_PARTN_BITS, \ max_nr:D_PER_MAJOR, \ nr_real:D_PER_MAJOR, static inline struct request * dasd_next_request( request_queue_t *queue ) { return *queue; } static inline void dasd_dequeue_request( request_queue_t * q, struct request *req ) { *q = req->next; req->next = NULL; } #else #define INIT_BLK_DEV(d_major,d_request_fn,d_queue_fn,d_current) \ do { \ blk_dev[d_major].queue = d_queue_fn; \ } while(0) #define INIT_GENDISK(D_MAJOR,D_NAME,D_PARTN_BITS,D_PER_MAJOR) \ major:D_MAJOR, \ major_name:D_NAME, \ minor_shift:D_PARTN_BITS, \ max_p:1 << D_PARTN_BITS, \ nr_real:D_PER_MAJOR, static inline struct request * dasd_next_request( request_queue_t *queue ) { return blkdev_entry_next_request(&queue->queue_head); } static inline void dasd_dequeue_request( request_queue_t * q, struct request *req ) { blkdev_dequeue_request (req); } #endif /* dasd_range_t are used for dynamic device att-/detachment */ typedef struct dasd_devreg_t { devreg_t devreg; /* the devreg itself */ /* build a linked list of devregs, needed for cleanup */ struct dasd_devreg_t *next; } dasd_devreg_t; typedef enum { dasd_era_fatal = -1, /* no chance to recover */ dasd_era_none = 0, /* don't recover, everything alright */ dasd_era_msg = 1, /* don't recover, just report... */ dasd_era_recover = 2 /* recovery action recommended */ } dasd_era_t; /* BIT DEFINITIONS FOR SENSE DATA */ #define DASD_SENSE_BIT_0 0x80 #define DASD_SENSE_BIT_1 0x40 #define DASD_SENSE_BIT_2 0x20 #define DASD_SENSE_BIT_3 0x10 #define check_then_set(where,from,to) \ do { \ if ((*(where)) != (from) ) { \ printk (KERN_ERR PRINTK_HEADER "was %d\n", *(where)); \ BUG(); \ } \ (*(where)) = (to); \ } while (0) #define DASD_MESSAGE(d_loglevel,d_device,d_string,d_args...)\ do { \ int d_devno = d_device->devinfo.devno; \ int d_irq = d_device->devinfo.irq; \ char *d_name = d_device->name; \ int d_major = MAJOR(d_device->kdev); \ int d_minor = MINOR(d_device->kdev); \ printk(d_loglevel PRINTK_HEADER \ "/dev/%s(%d:%d), 0x%04X on SCH 0x%x:" \ d_string "\n",d_name,d_major,d_minor,d_devno,d_irq,d_args ); \ } while(0) /* * struct dasd_sizes_t * represents all data needed to access dasd with properly set up sectors */ typedef struct dasd_sizes_t { unsigned long blocks; /* size of volume in blocks */ unsigned int bp_block; /* bytes per block */ unsigned int s2b_shift; /* log2 (bp_block/512) */ } dasd_sizes_t; /* * struct dasd_chanq_t * represents a queue of channel programs related to a single device */ typedef struct dasd_chanq_t { ccw_req_t *head; ccw_req_t *tail; } dasd_chanq_t; struct dasd_device_t; struct request; /* * signatures for the functions of dasd_discipline_t * make typecasts much easier */ typedef ccw_req_t *(*dasd_erp_action_fn_t) (ccw_req_t * cqr); typedef ccw_req_t *(*dasd_erp_postaction_fn_t) (ccw_req_t * cqr); typedef int (*dasd_ck_id_fn_t) (dev_info_t *); typedef int (*dasd_ck_characteristics_fn_t) (struct dasd_device_t *); typedef int (*dasd_fill_geometry_fn_t) (struct dasd_device_t *, struct hd_geometry *); typedef ccw_req_t *(*dasd_format_fn_t) (struct dasd_device_t *, struct format_data_t *); typedef ccw_req_t *(*dasd_init_analysis_fn_t) (struct dasd_device_t *); typedef int (*dasd_do_analysis_fn_t) (struct dasd_device_t *); typedef int (*dasd_io_starter_fn_t) (ccw_req_t *); typedef void (*dasd_int_handler_fn_t)(int irq, void *, struct pt_regs *); typedef dasd_era_t (*dasd_error_examine_fn_t) (ccw_req_t *, devstat_t * stat); typedef dasd_erp_action_fn_t (*dasd_error_analyse_fn_t) (ccw_req_t *); typedef dasd_erp_postaction_fn_t (*dasd_erp_analyse_fn_t) (ccw_req_t *); typedef ccw_req_t *(*dasd_cp_builder_fn_t)(struct dasd_device_t *,struct request *); typedef char *(*dasd_dump_sense_fn_t)(struct dasd_device_t *,ccw_req_t *); typedef ccw_req_t *(*dasd_reserve_fn_t)(struct dasd_device_t *); typedef ccw_req_t *(*dasd_release_fn_t)(struct dasd_device_t *); typedef ccw_req_t *(*dasd_merge_cp_fn_t)(struct dasd_device_t *); /* * the dasd_discipline_t is * sth like a table of virtual functions, if you think of dasd_eckd * inheriting dasd... * no, currently we are not planning to reimplement the driver in C++ */ typedef struct dasd_discipline_t { char ebcname[8]; /* a name used for tagging and printks */ char name[8]; /* a name used for tagging and printks */ dasd_ck_id_fn_t id_check; /* to check sense data */ dasd_ck_characteristics_fn_t check_characteristics; /* to check the characteristics */ dasd_init_analysis_fn_t init_analysis; /* to start the analysis of the volume */ dasd_do_analysis_fn_t do_analysis; /* to complete the analysis of the volume */ dasd_fill_geometry_fn_t fill_geometry; /* to set up hd_geometry */ dasd_io_starter_fn_t start_IO; dasd_format_fn_t format_device; /* to format the device */ dasd_error_examine_fn_t examine_error; dasd_error_analyse_fn_t erp_action; dasd_erp_analyse_fn_t erp_postaction; dasd_cp_builder_fn_t build_cp_from_req; dasd_dump_sense_fn_t dump_sense; dasd_int_handler_fn_t int_handler; dasd_reserve_fn_t reserve; dasd_release_fn_t release; dasd_merge_cp_fn_t merge_cp; struct dasd_discipline_t *next; /* used for list of disciplines */ } dasd_discipline_t; typedef struct major_info_t { struct major_info_t *next; struct dasd_device_t **dasd_device; struct gendisk gendisk; /* actually contains the major number */ } __attribute__ ((packed)) major_info_t; typedef struct dasd_profile_info_t { unsigned long dasd_io_reqs; /* number of requests processed at all */ unsigned long dasd_io_secs[32]; /* histogram of request's sizes */ unsigned long dasd_io_times[32]; /* histogram of requests's times */ unsigned long dasd_io_timps[32]; /* histogram of requests's times per sector */ unsigned long dasd_io_time1[32]; /* histogram of time from build to start */ unsigned long dasd_io_time2[32]; /* histogram of time from start to irq */ unsigned long dasd_io_time2ps[32]; /* histogram of time from start to irq */ unsigned long dasd_io_time3[32]; /* histogram of time from irq to end */ } dasd_profile_info_t; typedef struct dasd_device_t { dev_info_t devinfo; dasd_discipline_t *discipline; int level; int open_count; kdev_t kdev; major_info_t *major_info; struct dasd_chanq_t queue; wait_queue_head_t wait_q; request_queue_t request_queue; devstat_t dev_status; /* needed ONLY!! for request_irq */ dasd_sizes_t sizes; char name[16]; /* The name of the device in /dev */ char *private; /* to be used by the discipline internally */ #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,3,98)) devfs_handle_t devfs_entry; #endif /* LINUX_IS_24 */ struct tq_struct bh_tq; atomic_t bh_scheduled; debug_info_t *debug_area; dasd_profile_info_t profile; struct proc_dir_entry *proc_dir; /* directory node */ struct proc_dir_entry *proc_info; /* information from dasd_device_t */ struct proc_dir_entry *proc_stats; /* statictics information */ } dasd_device_t; /* dasd_device_t.level can be: */ #define DASD_DEVICE_LEVEL_UNKNOWN 0x00 #define DASD_DEVICE_LEVEL_RECOGNIZED 0x01 #define DASD_DEVICE_LEVEL_ANALYSIS_PENDING 0x02 #define DASD_DEVICE_LEVEL_ANALYSIS_PREPARED 0x04 #define DASD_DEVICE_LEVEL_ANALYSED 0x08 #define DASD_DEVICE_LEVEL_PARTITIONED 0x10 int dasd_init (void); void dasd_discipline_enq (dasd_discipline_t *); int dasd_discipline_deq(dasd_discipline_t *); int dasd_start_IO (ccw_req_t *); void dasd_int_handler (int , void *, struct pt_regs *); ccw_req_t *default_erp_action (ccw_req_t *); ccw_req_t *default_erp_postaction (ccw_req_t *); int dasd_chanq_deq (dasd_chanq_t *, ccw_req_t *); ccw_req_t *dasd_alloc_request (char *, int, int); void dasd_free_request (ccw_req_t *); int (*genhd_dasd_name) (char *, int, int, struct gendisk *); int dasd_oper_handler (int irq, devreg_t * devreg); #endif /* __KERNEL__ */ #endif /* DASD_H */ /* * Overrides for Emacs so that we follow Linus's tabbing style. * Emacs will notice this stuff at the end of the file and automatically * adjust the settings for this buffer only. This must remain at the end * of the file. * --------------------------------------------------------------------------- * Local variables: * c-indent-level: 4 * c-brace-imaginary-offset: 0 * c-brace-offset: -4 * c-argdecl-indent: 4 * c-label-offset: -4 * c-continued-statement-offset: 4 * c-continued-brace-offset: 0 * indent-tabs-mode: nil * tab-width: 8 * End: */