#ifndef _SCSI_SCSI_CMND_H #define _SCSI_SCSI_CMND_H #include <linux/dma-mapping.h> #include <linux/blkdev.h> #include <linux/list.h> #include <linux/types.h> #include <linux/timer.h> #include <linux/scatterlist.h> struct Scsi_Host; struct scsi_device; struct scsi_data_buffer { struct sg_table table; unsigned length; int resid; }; /* embedded in scsi_cmnd */ struct scsi_pointer { char *ptr; /* data pointer */ int this_residual; /* left in this buffer */ struct scatterlist *buffer; /* which buffer */ int buffers_residual; /* how many buffers left */ dma_addr_t dma_handle; volatile int Status; volatile int Message; volatile int have_data_in; volatile int sent_command; volatile int phase; }; struct scsi_cmnd { struct scsi_device *device; struct list_head list; /* scsi_cmnd participates in queue lists */ struct list_head eh_entry; /* entry for the host eh_cmd_q */ int eh_eflags; /* Used by error handlr */ /* * A SCSI Command is assigned a nonzero serial_number before passed * to the driver's queue command function. The serial_number is * cleared when scsi_done is entered indicating that the command * has been completed. It is a bug for LLDDs to use this number * for purposes other than printk (and even that is only useful * for debugging). */ unsigned long serial_number; /* * This is set to jiffies as it was when the command was first * allocated. It is used to time how long the command has * been outstanding */ unsigned long jiffies_at_alloc; int retries; int allowed; int timeout_per_command; unsigned char cmd_len; enum dma_data_direction sc_data_direction; /* These elements define the operation we are about to perform */ #define MAX_COMMAND_SIZE 16 unsigned char cmnd[MAX_COMMAND_SIZE]; struct timer_list eh_timeout; /* Used to time out the command. */ /* These elements define the operation we ultimately want to perform */ struct scsi_data_buffer sdb; unsigned underflow; /* Return error if less than this amount is transferred */ unsigned transfersize; /* How much we are guaranteed to transfer with each SCSI transfer (ie, between disconnect / reconnects. Probably == sector size */ struct request *request; /* The command we are working on */ #define SCSI_SENSE_BUFFERSIZE 96 unsigned char *sense_buffer; /* obtained by REQUEST SENSE when * CHECK CONDITION is received on original * command (auto-sense) */ /* Low-level done function - can be used by low-level driver to point * to completion function. Not used by mid/upper level code. */ void (*scsi_done) (struct scsi_cmnd *); /* * The following fields can be written to by the host specific code. * Everything else should be left alone. */ struct scsi_pointer SCp; /* Scratchpad used by some host adapters */ unsigned char *host_scribble; /* The host adapter is allowed to * call scsi_malloc and get some memory * and hang it here. The host adapter * is also expected to call scsi_free * to release this memory. (The memory * obtained by scsi_malloc is guaranteed * to be at an address < 16Mb). */ int result; /* Status code from lower level driver */ unsigned char tag; /* SCSI-II queued command tag */ }; extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t); extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t); extern void scsi_put_command(struct scsi_cmnd *); extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *, struct device *); extern void scsi_finish_command(struct scsi_cmnd *cmd); extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd); extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, size_t *offset, size_t *len); extern void scsi_kunmap_atomic_sg(void *virt); extern int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask); extern void scsi_release_buffers(struct scsi_cmnd *cmd); extern int scsi_dma_map(struct scsi_cmnd *cmd); extern void scsi_dma_unmap(struct scsi_cmnd *cmd); static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd) { return cmd->sdb.table.nents; } static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd) { return cmd->sdb.table.sgl; } static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd) { return cmd->sdb.length; } static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid) { cmd->sdb.resid = resid; } static inline int scsi_get_resid(struct scsi_cmnd *cmd) { return cmd->sdb.resid; } #define scsi_for_each_sg(cmd, sg, nseg, __i) \ for_each_sg(scsi_sglist(cmd), sg, nseg, __i) static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd) { return blk_bidi_rq(cmd->request) && (cmd->request->next_rq->special != NULL); } static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd) { return scsi_bidi_cmnd(cmd) ? cmd->request->next_rq->special : &cmd->sdb; } static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd) { return &cmd->sdb; } #endif /* _SCSI_SCSI_CMND_H */