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>
16 * MAX_COMMAND_SIZE is:
17 * The longest fixed-length SCSI CDB as per the SCSI standard.
18 * fixed-length means: commands that their size can be determined
19 * by their opcode and the CDB does not carry a length specifier, (unlike
20 * the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
21 * true and the SCSI standard also defines extended commands and
22 * vendor specific commands that can be bigger than 16 bytes. The kernel
23 * will support these using the same infrastructure used for VARLEN CDB's.
24 * So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
25 * supports without specifying a cmd_len by ULD's
27 #define MAX_COMMAND_SIZE 16
28 #if (MAX_COMMAND_SIZE > BLK_MAX_CDB)
29 # error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
32 struct scsi_data_buffer {
33 struct sg_table table;
38 /* embedded in scsi_cmnd */
40 char *ptr; /* data pointer */
41 int this_residual; /* left in this buffer */
42 struct scatterlist *buffer; /* which buffer */
43 int buffers_residual; /* how many buffers left */
45 dma_addr_t dma_handle;
49 volatile int have_data_in;
50 volatile int sent_command;
55 struct scsi_device *device;
56 struct list_head list; /* scsi_cmnd participates in queue lists */
57 struct list_head eh_entry; /* entry for the host eh_cmd_q */
58 struct delayed_work abort_work;
59 int eh_eflags; /* Used by error handlr */
62 * A SCSI Command is assigned a nonzero serial_number before passed
63 * to the driver's queue command function. The serial_number is
64 * cleared when scsi_done is entered indicating that the command
65 * has been completed. It is a bug for LLDDs to use this number
66 * for purposes other than printk (and even that is only useful
69 unsigned long serial_number;
72 * This is set to jiffies as it was when the command was first
73 * allocated. It is used to time how long the command has
76 unsigned long jiffies_at_alloc;
81 unsigned char prot_op;
82 unsigned char prot_type;
84 unsigned short cmd_len;
85 enum dma_data_direction sc_data_direction;
87 /* These elements define the operation we are about to perform */
91 /* These elements define the operation we ultimately want to perform */
92 struct scsi_data_buffer sdb;
93 struct scsi_data_buffer *prot_sdb;
95 unsigned underflow; /* Return error if less than
96 this amount is transferred */
98 unsigned transfersize; /* How much we are guaranteed to
99 transfer with each SCSI transfer
100 (ie, between disconnect /
101 reconnects. Probably == sector
104 struct request *request; /* The command we are
107 #define SCSI_SENSE_BUFFERSIZE 96
108 unsigned char *sense_buffer;
109 /* obtained by REQUEST SENSE when
110 * CHECK CONDITION is received on original
111 * command (auto-sense) */
113 /* Low-level done function - can be used by low-level driver to point
114 * to completion function. Not used by mid/upper level code. */
115 void (*scsi_done) (struct scsi_cmnd *);
118 * The following fields can be written to by the host specific code.
119 * Everything else should be left alone.
121 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
123 unsigned char *host_scribble; /* The host adapter is allowed to
124 * call scsi_malloc and get some memory
125 * and hang it here. The host adapter
126 * is also expected to call scsi_free
127 * to release this memory. (The memory
128 * obtained by scsi_malloc is guaranteed
129 * to be at an address < 16Mb). */
131 int result; /* Status code from lower level driver */
133 unsigned char tag; /* SCSI-II queued command tag */
136 /* make sure not to use it with REQ_TYPE_BLOCK_PC commands */
137 static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
139 return *(struct scsi_driver **)cmd->request->rq_disk->private_data;
142 extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
143 extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t);
144 extern void scsi_put_command(struct scsi_cmnd *);
145 extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *);
146 extern void scsi_finish_command(struct scsi_cmnd *cmd);
148 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
149 size_t *offset, size_t *len);
150 extern void scsi_kunmap_atomic_sg(void *virt);
152 extern int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask);
153 extern void scsi_release_buffers(struct scsi_cmnd *cmd);
155 extern int scsi_dma_map(struct scsi_cmnd *cmd);
156 extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
158 static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
160 return cmd->sdb.table.nents;
163 static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd)
165 return cmd->sdb.table.sgl;
168 static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
170 return cmd->sdb.length;
173 static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
175 cmd->sdb.resid = resid;
178 static inline int scsi_get_resid(struct scsi_cmnd *cmd)
180 return cmd->sdb.resid;
183 #define scsi_for_each_sg(cmd, sg, nseg, __i) \
184 for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
186 static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
188 return blk_bidi_rq(cmd->request) &&
189 (cmd->request->next_rq->special != NULL);
192 static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd)
194 return scsi_bidi_cmnd(cmd) ?
195 cmd->request->next_rq->special : &cmd->sdb;
198 static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd)
203 static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
204 void *buf, int buflen)
206 return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
210 static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
211 void *buf, int buflen)
213 return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
218 * The operations below are hints that tell the controller driver how
219 * to handle I/Os with DIF or similar types of protection information.
221 enum scsi_prot_operations {
223 SCSI_PROT_NORMAL = 0,
225 /* OS-HBA: Protected, HBA-Target: Unprotected */
226 SCSI_PROT_READ_INSERT,
227 SCSI_PROT_WRITE_STRIP,
229 /* OS-HBA: Unprotected, HBA-Target: Protected */
230 SCSI_PROT_READ_STRIP,
231 SCSI_PROT_WRITE_INSERT,
233 /* OS-HBA: Protected, HBA-Target: Protected */
235 SCSI_PROT_WRITE_PASS,
238 static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
243 static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
245 return scmd->prot_op;
249 * The controller usually does not know anything about the target it
250 * is communicating with. However, when DIX is enabled the controller
251 * must be know target type so it can verify the protection
252 * information passed along with the I/O.
254 enum scsi_prot_target_type {
255 SCSI_PROT_DIF_TYPE0 = 0,
261 static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
263 scmd->prot_type = type;
266 static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
268 return scmd->prot_type;
271 static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
273 return blk_rq_pos(scmd->request);
276 static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
278 return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
281 static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd)
283 return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
286 static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd)
288 return cmd->prot_sdb;
291 #define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
292 for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
294 static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
296 cmd->result = (cmd->result & 0xffff00ff) | (status << 8);
299 static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
301 cmd->result = (cmd->result & 0xff00ffff) | (status << 16);
304 static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
306 cmd->result = (cmd->result & 0x00ffffff) | (status << 24);
309 #endif /* _SCSI_SCSI_CMND_H */