1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _SCSI_SCSI_CMND_H
3 #define _SCSI_SCSI_CMND_H
5 #include <linux/dma-mapping.h>
6 #include <linux/blkdev.h>
7 #include <linux/t10-pi.h>
8 #include <linux/list.h>
9 #include <linux/types.h>
10 #include <linux/timer.h>
11 #include <linux/scatterlist.h>
12 #include <scsi/scsi_device.h>
13 #include <scsi/scsi_host.h>
14 #include <scsi/scsi_request.h>
20 * MAX_COMMAND_SIZE is:
21 * The longest fixed-length SCSI CDB as per the SCSI standard.
22 * fixed-length means: commands that their size can be determined
23 * by their opcode and the CDB does not carry a length specifier, (unlike
24 * the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
25 * true and the SCSI standard also defines extended commands and
26 * vendor specific commands that can be bigger than 16 bytes. The kernel
27 * will support these using the same infrastructure used for VARLEN CDB's.
28 * So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
29 * supports without specifying a cmd_len by ULD's
31 #define MAX_COMMAND_SIZE 16
32 #if (MAX_COMMAND_SIZE > BLK_MAX_CDB)
33 # error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
36 struct scsi_data_buffer {
37 struct sg_table table;
41 /* embedded in scsi_cmnd */
43 char *ptr; /* data pointer */
44 int this_residual; /* left in this buffer */
45 struct scatterlist *buffer; /* which buffer */
46 int buffers_residual; /* how many buffers left */
48 dma_addr_t dma_handle;
52 volatile int have_data_in;
53 volatile int sent_command;
58 #define SCMD_TAGGED (1 << 0)
59 #define SCMD_INITIALIZED (1 << 1)
60 #define SCMD_LAST (1 << 2)
61 /* flags preserved across unprep / reprep */
62 #define SCMD_PRESERVED_FLAGS (SCMD_INITIALIZED)
65 #define SCMD_STATE_COMPLETE 0
66 #define SCMD_STATE_INFLIGHT 1
68 enum scsi_cmnd_submitter {
69 SUBMITTED_BY_BLOCK_LAYER = 0,
70 SUBMITTED_BY_SCSI_ERROR_HANDLER = 1,
71 SUBMITTED_BY_SCSI_RESET_IOCTL = 2,
75 struct scsi_request req;
76 struct scsi_device *device;
77 struct list_head eh_entry; /* entry for the host eh_abort_list/eh_cmd_q */
78 struct delayed_work abort_work;
82 int eh_eflags; /* Used by error handlr */
87 * This is set to jiffies as it was when the command was first
88 * allocated. It is used to time how long the command has
91 unsigned long jiffies_at_alloc;
96 unsigned char prot_op;
97 unsigned char prot_type;
98 unsigned char prot_flags;
99 enum scsi_cmnd_submitter submitter;
101 unsigned short cmd_len;
102 enum dma_data_direction sc_data_direction;
104 /* These elements define the operation we are about to perform */
108 /* These elements define the operation we ultimately want to perform */
109 struct scsi_data_buffer sdb;
110 struct scsi_data_buffer *prot_sdb;
112 unsigned underflow; /* Return error if less than
113 this amount is transferred */
115 unsigned transfersize; /* How much we are guaranteed to
116 transfer with each SCSI transfer
117 (ie, between disconnect /
118 reconnects. Probably == sector
121 unsigned char *sense_buffer;
122 /* obtained by REQUEST SENSE when
123 * CHECK CONDITION is received on original
124 * command (auto-sense). Length must be
125 * SCSI_SENSE_BUFFERSIZE bytes. */
127 /* Low-level done function - can be used by low-level driver to point
128 * to completion function. Not used by mid/upper level code. */
129 void (*scsi_done) (struct scsi_cmnd *);
132 * The following fields can be written to by the host specific code.
133 * Everything else should be left alone.
135 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
137 unsigned char *host_scribble; /* The host adapter is allowed to
138 * call scsi_malloc and get some memory
139 * and hang it here. The host adapter
140 * is also expected to call scsi_free
141 * to release this memory. (The memory
142 * obtained by scsi_malloc is guaranteed
143 * to be at an address < 16Mb). */
145 int result; /* Status code from lower level driver */
146 int flags; /* Command flags */
147 unsigned long state; /* Command completion state */
149 unsigned int extra_len; /* length of alignment and padding */
152 /* Variant of blk_mq_rq_from_pdu() that verifies the type of its argument. */
153 static inline struct request *scsi_cmd_to_rq(struct scsi_cmnd *scmd)
155 return blk_mq_rq_from_pdu(scmd);
159 * Return the driver private allocation behind the command.
160 * Only works if cmd_size is set in the host template.
162 static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd)
167 /* make sure not to use it with passthrough commands */
168 static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
170 struct request *rq = scsi_cmd_to_rq(cmd);
172 return *(struct scsi_driver **)rq->rq_disk->private_data;
175 void scsi_done(struct scsi_cmnd *cmd);
177 extern void scsi_finish_command(struct scsi_cmnd *cmd);
179 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
180 size_t *offset, size_t *len);
181 extern void scsi_kunmap_atomic_sg(void *virt);
183 blk_status_t scsi_alloc_sgtables(struct scsi_cmnd *cmd);
184 void scsi_free_sgtables(struct scsi_cmnd *cmd);
186 #ifdef CONFIG_SCSI_DMA
187 extern int scsi_dma_map(struct scsi_cmnd *cmd);
188 extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
189 #else /* !CONFIG_SCSI_DMA */
190 static inline int scsi_dma_map(struct scsi_cmnd *cmd) { return -ENOSYS; }
191 static inline void scsi_dma_unmap(struct scsi_cmnd *cmd) { }
192 #endif /* !CONFIG_SCSI_DMA */
194 static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
196 return cmd->sdb.table.nents;
199 static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd)
201 return cmd->sdb.table.sgl;
204 static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
206 return cmd->sdb.length;
209 static inline void scsi_set_resid(struct scsi_cmnd *cmd, unsigned int resid)
211 cmd->req.resid_len = resid;
214 static inline unsigned int scsi_get_resid(struct scsi_cmnd *cmd)
216 return cmd->req.resid_len;
219 #define scsi_for_each_sg(cmd, sg, nseg, __i) \
220 for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
222 static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
223 const void *buf, int buflen)
225 return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
229 static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
230 void *buf, int buflen)
232 return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
236 static inline sector_t scsi_get_sector(struct scsi_cmnd *scmd)
238 return blk_rq_pos(scsi_cmd_to_rq(scmd));
241 static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
243 unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;
245 return blk_rq_pos(scsi_cmd_to_rq(scmd)) >> shift;
248 static inline unsigned int scsi_logical_block_count(struct scsi_cmnd *scmd)
250 unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;
252 return blk_rq_bytes(scsi_cmd_to_rq(scmd)) >> shift;
256 * The operations below are hints that tell the controller driver how
257 * to handle I/Os with DIF or similar types of protection information.
259 enum scsi_prot_operations {
261 SCSI_PROT_NORMAL = 0,
263 /* OS-HBA: Protected, HBA-Target: Unprotected */
264 SCSI_PROT_READ_INSERT,
265 SCSI_PROT_WRITE_STRIP,
267 /* OS-HBA: Unprotected, HBA-Target: Protected */
268 SCSI_PROT_READ_STRIP,
269 SCSI_PROT_WRITE_INSERT,
271 /* OS-HBA: Protected, HBA-Target: Protected */
273 SCSI_PROT_WRITE_PASS,
276 static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
281 static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
283 return scmd->prot_op;
286 enum scsi_prot_flags {
287 SCSI_PROT_TRANSFER_PI = 1 << 0,
288 SCSI_PROT_GUARD_CHECK = 1 << 1,
289 SCSI_PROT_REF_CHECK = 1 << 2,
290 SCSI_PROT_REF_INCREMENT = 1 << 3,
291 SCSI_PROT_IP_CHECKSUM = 1 << 4,
295 * The controller usually does not know anything about the target it
296 * is communicating with. However, when DIX is enabled the controller
297 * must be know target type so it can verify the protection
298 * information passed along with the I/O.
300 enum scsi_prot_target_type {
301 SCSI_PROT_DIF_TYPE0 = 0,
307 static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
309 scmd->prot_type = type;
312 static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
314 return scmd->prot_type;
317 static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
319 struct request *rq = blk_mq_rq_from_pdu(scmd);
321 return t10_pi_ref_tag(rq);
324 static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd)
326 return scmd->device->sector_size;
329 static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
331 return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
334 static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd)
336 return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
339 static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd)
341 return cmd->prot_sdb;
344 #define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
345 for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
347 static inline void set_status_byte(struct scsi_cmnd *cmd, char status)
349 cmd->result = (cmd->result & 0xffffff00) | status;
352 static inline u8 get_status_byte(struct scsi_cmnd *cmd)
354 return cmd->result & 0xff;
357 static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
359 cmd->result = (cmd->result & 0xff00ffff) | (status << 16);
362 static inline u8 get_host_byte(struct scsi_cmnd *cmd)
364 return (cmd->result >> 16) & 0xff;
368 * scsi_msg_to_host_byte() - translate message byte
370 * Translate the SCSI parallel message byte to a matching
371 * host byte setting. A message of COMMAND_COMPLETE indicates
372 * a successful command execution, any other message indicate
373 * an error. As the messages themselves only have a meaning
374 * for the SCSI parallel protocol this function translates
375 * them into a matching host byte value for SCSI EH.
377 static inline void scsi_msg_to_host_byte(struct scsi_cmnd *cmd, u8 msg)
380 case COMMAND_COMPLETE:
383 set_host_byte(cmd, DID_ABORT);
386 set_host_byte(cmd, DID_RESET);
389 set_host_byte(cmd, DID_ERROR);
394 static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
396 unsigned int xfer_len = scmd->sdb.length;
397 unsigned int prot_interval = scsi_prot_interval(scmd);
399 if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI)
400 xfer_len += (xfer_len >> ilog2(prot_interval)) * 8;
405 extern void scsi_build_sense(struct scsi_cmnd *scmd, int desc,
406 u8 key, u8 asc, u8 ascq);
408 #endif /* _SCSI_SCSI_CMND_H */