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include/scsi/scsi_cmnd.h
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#ifndef _SCSI_SCSI_CMND_H #define _SCSI_SCSI_CMND_H #include <linux/dma-mapping.h> |
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#include <linux/blkdev.h> |
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#include <linux/list.h> #include <linux/types.h> |
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#include <linux/timer.h> |
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#include <linux/scatterlist.h> |
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struct Scsi_Host; |
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struct scsi_device; |
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/* * MAX_COMMAND_SIZE is: * The longest fixed-length SCSI CDB as per the SCSI standard. * fixed-length means: commands that their size can be determined * by their opcode and the CDB does not carry a length specifier, (unlike * the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly * true and the SCSI standard also defines extended commands and * vendor specific commands that can be bigger than 16 bytes. The kernel * will support these using the same infrastructure used for VARLEN CDB's. * So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml * supports without specifying a cmd_len by ULD's */ #define MAX_COMMAND_SIZE 16 #if (MAX_COMMAND_SIZE > BLK_MAX_CDB) # error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB #endif |
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struct scsi_data_buffer { struct sg_table table; unsigned length; int resid; }; |
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/* 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 { |
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struct scsi_device *device; |
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struct list_head list; /* scsi_cmnd participates in queue lists */ |
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struct list_head eh_entry; /* entry for the host eh_cmd_q */ |
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int eh_eflags; /* Used by error handlr */ |
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/* |
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* 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 |
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* 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). |
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*/ unsigned long serial_number; |
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/* * 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; |
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int retries; int allowed; |
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unsigned char prot_op; unsigned char prot_type; |
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unsigned short cmd_len; |
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enum dma_data_direction sc_data_direction; |
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/* These elements define the operation we are about to perform */ |
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unsigned char *cmnd; |
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/* These elements define the operation we ultimately want to perform */ |
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struct scsi_data_buffer sdb; |
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struct scsi_data_buffer *prot_sdb; |
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unsigned underflow; /* Return error if less than this amount is transferred */ |
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unsigned transfersize; /* How much we are guaranteed to transfer with each SCSI transfer (ie, between disconnect / reconnects. Probably == sector size */ |
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struct request *request; /* The command we are working on */ #define SCSI_SENSE_BUFFERSIZE 96 |
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unsigned char *sense_buffer; |
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/* obtained by REQUEST SENSE when * CHECK CONDITION is received on original * command (auto-sense) */ |
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/* 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 |
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* 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). */ |
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int result; /* Status code from lower level driver */ unsigned char tag; /* SCSI-II queued command tag */ |
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}; |
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extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t); |
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extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t); |
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extern void scsi_put_command(struct scsi_cmnd *); |
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extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *, struct device *); |
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extern void scsi_finish_command(struct scsi_cmnd *cmd); |
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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); |
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extern int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask); extern void scsi_release_buffers(struct scsi_cmnd *cmd); |
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extern int scsi_dma_map(struct scsi_cmnd *cmd); extern void scsi_dma_unmap(struct scsi_cmnd *cmd); |
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struct scsi_cmnd *scsi_allocate_command(gfp_t gfp_mask); void scsi_free_command(gfp_t gfp_mask, struct scsi_cmnd *cmd); |
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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; } |
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static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid) { |
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cmd->sdb.resid = resid; |
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} static inline int scsi_get_resid(struct scsi_cmnd *cmd) { |
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return cmd->sdb.resid; |
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} #define scsi_for_each_sg(cmd, sg, nseg, __i) \ |
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for_each_sg(scsi_sglist(cmd), sg, nseg, __i) |
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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; } |
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static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd, void *buf, int buflen) { return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, buflen); } static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd, void *buf, int buflen) { return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, buflen); } |
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/* * The operations below are hints that tell the controller driver how * to handle I/Os with DIF or similar types of protection information. */ enum scsi_prot_operations { /* Normal I/O */ SCSI_PROT_NORMAL = 0, /* OS-HBA: Protected, HBA-Target: Unprotected */ SCSI_PROT_READ_INSERT, SCSI_PROT_WRITE_STRIP, /* OS-HBA: Unprotected, HBA-Target: Protected */ SCSI_PROT_READ_STRIP, SCSI_PROT_WRITE_INSERT, /* OS-HBA: Protected, HBA-Target: Protected */ SCSI_PROT_READ_PASS, SCSI_PROT_WRITE_PASS, |
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}; static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op) { scmd->prot_op = op; } static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd) { return scmd->prot_op; } /* * The controller usually does not know anything about the target it * is communicating with. However, when DIX is enabled the controller * must be know target type so it can verify the protection * information passed along with the I/O. */ enum scsi_prot_target_type { SCSI_PROT_DIF_TYPE0 = 0, SCSI_PROT_DIF_TYPE1, SCSI_PROT_DIF_TYPE2, SCSI_PROT_DIF_TYPE3, }; static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type) { scmd->prot_type = type; } static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd) { return scmd->prot_type; } static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd) { |
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return blk_rq_pos(scmd->request); |
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} |
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static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd) { return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0; } static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd) { return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL; } static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd) { return cmd->prot_sdb; } #define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \ for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i) |
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static inline void set_msg_byte(struct scsi_cmnd *cmd, char status) { cmd->result |= status << 8; } static inline void set_host_byte(struct scsi_cmnd *cmd, char status) { cmd->result |= status << 16; } static inline void set_driver_byte(struct scsi_cmnd *cmd, char status) { cmd->result |= status << 24; } |
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#endif /* _SCSI_SCSI_CMND_H */ |