1 #ifndef _SCSI_SCSI_CMND_H
2 #define _SCSI_SCSI_CMND_H
4 #include <linux/dma-mapping.h>
5 #include <linux/blkdev.h>
6 #include <linux/list.h>
7 #include <linux/types.h>
8 #include <linux/timer.h>
9 #include <linux/scatterlist.h>
10 #include <scsi/scsi_device.h>
17 * MAX_COMMAND_SIZE is:
18 * The longest fixed-length SCSI CDB as per the SCSI standard.
19 * fixed-length means: commands that their size can be determined
20 * by their opcode and the CDB does not carry a length specifier, (unlike
21 * the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
22 * true and the SCSI standard also defines extended commands and
23 * vendor specific commands that can be bigger than 16 bytes. The kernel
24 * will support these using the same infrastructure used for VARLEN CDB's.
25 * So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
26 * supports without specifying a cmd_len by ULD's
28 #define MAX_COMMAND_SIZE 16
29 #if (MAX_COMMAND_SIZE > BLK_MAX_CDB)
30 # error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
33 struct scsi_data_buffer {
34 struct sg_table table;
39 /* embedded in scsi_cmnd */
41 char *ptr; /* data pointer */
42 int this_residual; /* left in this buffer */
43 struct scatterlist *buffer; /* which buffer */
44 int buffers_residual; /* how many buffers left */
46 dma_addr_t dma_handle;
50 volatile int have_data_in;
51 volatile int sent_command;
56 struct scsi_device *device;
57 struct list_head list; /* scsi_cmnd participates in queue lists */
58 struct list_head eh_entry; /* entry for the host eh_cmd_q */
59 struct delayed_work abort_work;
60 int eh_eflags; /* Used by error handlr */
63 * A SCSI Command is assigned a nonzero serial_number before passed
64 * to the driver's queue command function. The serial_number is
65 * cleared when scsi_done is entered indicating that the command
66 * has been completed. It is a bug for LLDDs to use this number
67 * for purposes other than printk (and even that is only useful
70 unsigned long serial_number;
73 * This is set to jiffies as it was when the command was first
74 * allocated. It is used to time how long the command has
77 unsigned long jiffies_at_alloc;
82 unsigned char prot_op;
83 unsigned char prot_type;
85 unsigned short cmd_len;
86 enum dma_data_direction sc_data_direction;
88 /* These elements define the operation we are about to perform */
92 /* These elements define the operation we ultimately want to perform */
93 struct scsi_data_buffer sdb;
94 struct scsi_data_buffer *prot_sdb;
96 unsigned underflow; /* Return error if less than
97 this amount is transferred */
99 unsigned transfersize; /* How much we are guaranteed to
100 transfer with each SCSI transfer
101 (ie, between disconnect /
102 reconnects. Probably == sector
105 struct request *request; /* The command we are
108 #define SCSI_SENSE_BUFFERSIZE 96
109 unsigned char *sense_buffer;
110 /* obtained by REQUEST SENSE when
111 * CHECK CONDITION is received on original
112 * command (auto-sense) */
114 /* Low-level done function - can be used by low-level driver to point
115 * to completion function. Not used by mid/upper level code. */
116 void (*scsi_done) (struct scsi_cmnd *);
119 * The following fields can be written to by the host specific code.
120 * Everything else should be left alone.
122 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
124 unsigned char *host_scribble; /* The host adapter is allowed to
125 * call scsi_malloc and get some memory
126 * and hang it here. The host adapter
127 * is also expected to call scsi_free
128 * to release this memory. (The memory
129 * obtained by scsi_malloc is guaranteed
130 * to be at an address < 16Mb). */
132 int result; /* Status code from lower level driver */
134 unsigned char tag; /* SCSI-II queued command tag */
138 * Return the driver private allocation behind the command.
139 * Only works if cmd_size is set in the host template.
141 static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd)
146 /* make sure not to use it with REQ_TYPE_BLOCK_PC commands */
147 static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
149 return *(struct scsi_driver **)cmd->request->rq_disk->private_data;
152 extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
153 extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t);
154 extern void scsi_put_command(struct scsi_cmnd *);
155 extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *);
156 extern void scsi_finish_command(struct scsi_cmnd *cmd);
158 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
159 size_t *offset, size_t *len);
160 extern void scsi_kunmap_atomic_sg(void *virt);
162 extern int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask);
163 extern void scsi_release_buffers(struct scsi_cmnd *cmd);
165 extern int scsi_dma_map(struct scsi_cmnd *cmd);
166 extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
168 static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
170 return cmd->sdb.table.nents;
173 static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd)
175 return cmd->sdb.table.sgl;
178 static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
180 return cmd->sdb.length;
183 static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
185 cmd->sdb.resid = resid;
188 static inline int scsi_get_resid(struct scsi_cmnd *cmd)
190 return cmd->sdb.resid;
193 #define scsi_for_each_sg(cmd, sg, nseg, __i) \
194 for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
196 static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
198 return blk_bidi_rq(cmd->request) &&
199 (cmd->request->next_rq->special != NULL);
202 static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd)
204 return scsi_bidi_cmnd(cmd) ?
205 cmd->request->next_rq->special : &cmd->sdb;
208 static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd)
213 static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
214 void *buf, int buflen)
216 return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
220 static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
221 void *buf, int buflen)
223 return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
228 * The operations below are hints that tell the controller driver how
229 * to handle I/Os with DIF or similar types of protection information.
231 enum scsi_prot_operations {
233 SCSI_PROT_NORMAL = 0,
235 /* OS-HBA: Protected, HBA-Target: Unprotected */
236 SCSI_PROT_READ_INSERT,
237 SCSI_PROT_WRITE_STRIP,
239 /* OS-HBA: Unprotected, HBA-Target: Protected */
240 SCSI_PROT_READ_STRIP,
241 SCSI_PROT_WRITE_INSERT,
243 /* OS-HBA: Protected, HBA-Target: Protected */
245 SCSI_PROT_WRITE_PASS,
248 static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
253 static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
255 return scmd->prot_op;
259 * The controller usually does not know anything about the target it
260 * is communicating with. However, when DIX is enabled the controller
261 * must be know target type so it can verify the protection
262 * information passed along with the I/O.
264 enum scsi_prot_target_type {
265 SCSI_PROT_DIF_TYPE0 = 0,
271 static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
273 scmd->prot_type = type;
276 static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
278 return scmd->prot_type;
281 static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
283 return blk_rq_pos(scmd->request);
286 static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
288 return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
291 static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd)
293 return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
296 static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd)
298 return cmd->prot_sdb;
301 #define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
302 for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
304 static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
306 cmd->result = (cmd->result & 0xffff00ff) | (status << 8);
309 static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
311 cmd->result = (cmd->result & 0xff00ffff) | (status << 16);
314 static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
316 cmd->result = (cmd->result & 0x00ffffff) | (status << 24);
319 static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
321 unsigned int xfer_len = blk_rq_bytes(scmd->request);
322 unsigned int prot_op = scsi_get_prot_op(scmd);
323 unsigned int sector_size = scmd->device->sector_size;
326 case SCSI_PROT_NORMAL:
327 case SCSI_PROT_WRITE_STRIP:
328 case SCSI_PROT_READ_INSERT:
332 return xfer_len + (xfer_len >> ilog2(sector_size)) * 8;
335 #endif /* _SCSI_SCSI_CMND_H */