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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-s390/] [ccwcache.h] - Rev 1765
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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 * * $Revision: 1.1.1.1 $ * */ #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; /* expiration 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 */ void *lowmem_idal; /* lowmem page for idals (if in use) */ void *lowmem_idal_ptr; /* ptr to the actual idal word in the idals page */ 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 /* cqr is empty */ #define CQR_STATUS_FILLED 0x01 /* cqr is ready to be preocessed */ #define CQR_STATUS_QUEUED 0x02 /* cqr is queued to be processed */ #define CQR_STATUS_IN_IO 0x03 /* cqr is currently in IO */ #define CQR_STATUS_DONE 0x04 /* cqr is completed successfully */ #define CQR_STATUS_ERROR 0x05 /* cqr is completed with error */ #define CQR_STATUS_FAILED 0x06 /* cqr is finally failed */ #define CQR_FLAGS_CHAINED 0x01 /* cqr is chained by another (last CCW is TIC) */ #define CQR_FLAGS_FINALIZED 0x02 #define CQR_FLAGS_LM_CQR 0x04 /* cqr uses page from lowmem_pool */ #define CQR_FLAGS_LM_IDAL 0x08 /* IDALs uses page from lowmem_pool */ #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 */