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phoenix |
/*
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* File...........: linux/include/asm-s390/ccwcache.h
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* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
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* Bugreports.to..: <Linux390@de.ibm.com>
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* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000
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*
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* $Revision: 1.1.1.1 $
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*
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*/
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#ifndef CCWCACHE_H
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#define CCWCACHE_H
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#include <linux/slab.h>
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#include <asm/irq.h>
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#ifndef __KERNEL__
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#define kmem_cache_t void
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#endif /* __KERNEL__ */
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typedef struct ccw_req_t {
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/* eye catcher plus queueing information */
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unsigned int magic;
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struct ccw_req_t *next; /* pointer to next ccw_req_t in queue */
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struct ccw_req_t *int_next; /* for internal queueing */
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struct ccw_req_t *int_prev; /* for internal queueing */
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/* Where to execute what... */
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void *device; /* index of the device the req is for */
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void *req; /* pointer to originating request */
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ccw1_t *cpaddr; /* address of channel program */
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char status; /* reflecting the status of this request */
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char flags; /* see below */
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short retries; /* A retry counter to be set when filling */
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/* ... and how */
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int options; /* options for execution */
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char lpm; /* logical path mask */
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void *data; /* pointer to data area */
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devstat_t *dstat; /* The device status in case of an error */
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/* these are important for recovering erroneous requests */
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struct ccw_req_t *refers; /* Does this request refer to another one? */
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void *function; /* refers to the originating ERP action */ ;
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unsigned long long expires; /* expiration period */
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/* these are for profiling purposes */
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unsigned long long buildclk; /* TOD-clock of request generation */
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unsigned long long startclk; /* TOD-clock of request start */
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unsigned long long stopclk; /* TOD-clock of request interrupt */
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unsigned long long endclk; /* TOD-clock of request termination */
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/* these are for internal use */
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int cplength; /* length of the channel program in CCWs */
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int datasize; /* amount of additional data in bytes */
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void *lowmem_idal; /* lowmem page for idals (if in use) */
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void *lowmem_idal_ptr; /* ptr to the actual idal word in the idals page */
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kmem_cache_t *cache; /* the cache this data comes from */
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} __attribute__ ((aligned(4))) ccw_req_t;
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/*
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* ccw_req_t -> status can be:
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*/
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#define CQR_STATUS_EMPTY 0x00 /* cqr is empty */
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#define CQR_STATUS_FILLED 0x01 /* cqr is ready to be preocessed */
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#define CQR_STATUS_QUEUED 0x02 /* cqr is queued to be processed */
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#define CQR_STATUS_IN_IO 0x03 /* cqr is currently in IO */
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#define CQR_STATUS_DONE 0x04 /* cqr is completed successfully */
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#define CQR_STATUS_ERROR 0x05 /* cqr is completed with error */
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#define CQR_STATUS_FAILED 0x06 /* cqr is finally failed */
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#define CQR_FLAGS_CHAINED 0x01 /* cqr is chained by another (last CCW is TIC) */
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#define CQR_FLAGS_FINALIZED 0x02
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#define CQR_FLAGS_LM_CQR 0x04 /* cqr uses page from lowmem_pool */
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#define CQR_FLAGS_LM_IDAL 0x08 /* IDALs uses page from lowmem_pool */
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#ifdef __KERNEL__
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#define SMALLEST_SLAB (sizeof(struct ccw_req_t) <= 128 ? 128 :\
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sizeof(struct ccw_req_t) <= 256 ? 256 : 512 )
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/* SMALLEST_SLAB(1),... PAGE_SIZE(CCW_NUMBER_CACHES) */
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#define CCW_NUMBER_CACHES (sizeof(struct ccw_req_t) <= 128 ? 6 :\
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sizeof(struct ccw_req_t) <= 256 ? 5 : 4 )
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int ccwcache_init (void);
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ccw_req_t *ccw_alloc_request (char *magic, int cplength, int additional_data);
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void ccw_free_request (ccw_req_t * request);
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#endif /* __KERNEL__ */
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#endif /* CCWCACHE_H */
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