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/*
* File...........: linux/include/asm-s390/ccwcache.h
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000
*/
#ifndef CCWCACHE_H
#define CCWCACHE_H
#include <linux/slab.h>
#include <asm/irq.h>
#ifndef __KERNEL__
#define kmem_cache_t void
#endif /* __KERNEL__ */
typedef struct ccw_req_t {
/* eye catcher plus queueing information */
unsigned int magic;
struct ccw_req_t *next; /* pointer to next ccw_req_t in queue */
struct ccw_req_t *int_next; /* for internal queueing */
struct ccw_req_t *int_prev; /* for internal queueing */
/* Where to execute what... */
void *device; /* index of the device the req is for */
void *req; /* pointer to originating request */
ccw1_t *cpaddr; /* address of channel program */
char status; /* reflecting the status of this request */
char flags; /* see below */
short retries; /* A retry counter to be set when filling */
/* ... and how */
int options; /* options for execution */
char lpm; /* logical path mask */
void *data; /* pointer to data area */
devstat_t *dstat; /* The device status in case of an error */
/* these are important for recovering erroneous requests */
struct ccw_req_t *refers; /* Does this request refer to another one? */
void *function; /* refers to the originating ERP action */ ;
unsigned long long expires; /* expiratioj period */
/* these are for profiling purposes */
unsigned long long buildclk; /* TOD-clock of request generation */
unsigned long long startclk; /* TOD-clock of request start */
unsigned long long stopclk; /* TOD-clock of request interrupt */
unsigned long long endclk; /* TOD-clock of request termination */
/* these are for internal use */
int cplength; /* length of the channel program in CCWs */
int datasize; /* amount of additional data in bytes */
kmem_cache_t *cache; /* the cache this data comes from */
} __attribute__ ((aligned(4))) ccw_req_t;
/*
* ccw_req_t -> status can be:
*/
#define CQR_STATUS_EMPTY 0x00 /* request is empty */
#define CQR_STATUS_FILLED 0x01 /* request is ready to be preocessed */
#define CQR_STATUS_QUEUED 0x02 /* request is queued to be processed */
#define CQR_STATUS_IN_IO 0x03 /* request is currently in IO */
#define CQR_STATUS_DONE 0x04 /* request is completed successfully */
#define CQR_STATUS_ERROR 0x05 /* request is completed with error */
#define CQR_STATUS_FAILED 0x06 /* request is finally failed */
#define CQR_FLAGS_CHAINED 0x01 /* request is chained by another (last CCW is TIC) */
#ifdef __KERNEL__
#define SMALLEST_SLAB (sizeof(struct ccw_req_t) <= 128 ? 128 :\
sizeof(struct ccw_req_t) <= 256 ? 256 : 512 )
/* SMALLEST_SLAB(1),... PAGE_SIZE(CCW_NUMBER_CACHES) */
#define CCW_NUMBER_CACHES (sizeof(struct ccw_req_t) <= 128 ? 6 :\
sizeof(struct ccw_req_t) <= 256 ? 5 : 4 )
int ccwcache_init (void);
ccw_req_t *ccw_alloc_request (char *magic, int cplength, int additional_data);
void ccw_free_request (ccw_req_t * request);
#endif /* __KERNEL__ */
#endif /* CCWCACHE_H */
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