/*
* 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__ */
/*
* smalles slab to be allocated (DASD_MINIMUM_CCW CCWs + metadata)
*/
typedef struct ccw_req_t {
/* these identify the request */
unsigned long magic; /* magic number */
atomic_t status; /* reflecting the status of this request */
unsigned long long expires; /* clock value, when request expires */
/* these are important for executing the requests */
ccw1_t *cpaddr; /* address of channel program */
void *data; /* pointer to data area */
void *req; /* pointer to originating request */
struct ccw_req_t *next; /* pointer to next ccw_req_t in queue */
int options; /* options for execution */
int cplength; /* length of the channel program in CCWs */
int datasize; /* amount of additional data in bytes */
devstat_t *dstat; /* The device status in case of an error */
/* these are important for recovering erroneous requests */
short retries; /* A retry counter to be set when filling */
char lpm; /* logical path mask */
devstat_t *devstat; /* Keeping the device status */
struct ccw_req_t *refers; /* Does this request refer to another one? */
void *function; /* refers to the originating ERP action */ ;
/* 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 */
struct ccw_req_t *int_next; /* for internal queueing */
struct ccw_req_t *int_prev; /* for internal queueing */
kmem_cache_t *cache; /* the cache this data comes from */
void *device; /* index of the device the req is for */
} __attribute__ ((packed,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 0x04 /* request is currently in IO */
#define CQR_STATUS_DONE 0x08 /* request is completed successfully */
#define CQR_STATUS_ERROR 0x10 /* request is completed with error */
#define CQR_STATUS_FAILED 0x20 /* request is finally failed */
#define CQR_STATUS_PENDING 0x07 /* request is waiting for interrupt - ERP only */
#define CQR_STATUS_FINISHED 0x40 /* request is ready for cleanup */
#ifdef __KERNEL__
#define SMALLEST_SLAB (sizeof(struct ccw_req_t) <= 128 ? 128 :\
sizeof(struct ccw_req_t) <= 256 ? 256 :\
sizeof(struct ccw_req_t) <= 512 ? 512 :\
sizeof(struct ccw_req_t) <= 1024 ? 1024 : 2048)
/* 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 :\
sizeof(struct ccw_req_t) <= 512 ? 4 :\
sizeof(struct ccw_req_t) <= 1024 ? 3 : 2)
int ccwcache_init (void);
ccw_req_t *ccw_alloc_request (char *magic, int cplength, int datasize);
void ccw_free_request (ccw_req_t * request);
#endif /* __KERNEL__ */
#endif /* CCWCACHE_H */
