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
69 struct scsi_request req;
70 struct scsi_device *device;
71 struct list_head eh_entry; /* entry for the host eh_cmd_q */
72 struct delayed_work abort_work;
76 int eh_eflags; /* Used by error handlr */
81 * This is set to jiffies as it was when the command was first
82 * allocated. It is used to time how long the command has
85 unsigned long jiffies_at_alloc;
90 unsigned char prot_op;
91 unsigned char prot_type;
92 unsigned char prot_flags;
94 unsigned short cmd_len;
95 enum dma_data_direction sc_data_direction;
97 /* These elements define the operation we are about to perform */
101 /* These elements define the operation we ultimately want to perform */
102 struct scsi_data_buffer sdb;
103 struct scsi_data_buffer *prot_sdb;
105 unsigned underflow; /* Return error if less than
106 this amount is transferred */
108 unsigned transfersize; /* How much we are guaranteed to
109 transfer with each SCSI transfer
110 (ie, between disconnect /
111 reconnects. Probably == sector
114 unsigned char *sense_buffer;
115 /* obtained by REQUEST SENSE when
116 * CHECK CONDITION is received on original
117 * command (auto-sense). Length must be
118 * SCSI_SENSE_BUFFERSIZE bytes. */
120 /* Low-level done function - can be used by low-level driver to point
121 * to completion function. Not used by mid/upper level code. */
122 void (*scsi_done) (struct scsi_cmnd *);
125 * The following fields can be written to by the host specific code.
126 * Everything else should be left alone.
128 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
130 unsigned char *host_scribble; /* The host adapter is allowed to
131 * call scsi_malloc and get some memory
132 * and hang it here. The host adapter
133 * is also expected to call scsi_free
134 * to release this memory. (The memory
135 * obtained by scsi_malloc is guaranteed
136 * to be at an address < 16Mb). */
138 int result; /* Status code from lower level driver */
139 int flags; /* Command flags */
140 unsigned long state; /* Command completion state */
142 unsigned char tag; /* SCSI-II queued command tag */
143 unsigned int extra_len; /* length of alignment and padding */
146 /* Variant of blk_mq_rq_from_pdu() that verifies the type of its argument. */
147 static inline struct request *scsi_cmd_to_rq(struct scsi_cmnd *scmd)
149 return blk_mq_rq_from_pdu(scmd);
153 * Return the driver private allocation behind the command.
154 * Only works if cmd_size is set in the host template.
156 static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd)
161 /* make sure not to use it with passthrough commands */
162 static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
164 struct request *rq = scsi_cmd_to_rq(cmd);
166 return *(struct scsi_driver **)rq->rq_disk->private_data;
169 extern void scsi_finish_command(struct scsi_cmnd *cmd);
171 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
172 size_t *offset, size_t *len);
173 extern void scsi_kunmap_atomic_sg(void *virt);
175 blk_status_t scsi_alloc_sgtables(struct scsi_cmnd *cmd);
176 void scsi_free_sgtables(struct scsi_cmnd *cmd);
178 #ifdef CONFIG_SCSI_DMA
179 extern int scsi_dma_map(struct scsi_cmnd *cmd);
180 extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
181 #else /* !CONFIG_SCSI_DMA */
182 static inline int scsi_dma_map(struct scsi_cmnd *cmd) { return -ENOSYS; }
183 static inline void scsi_dma_unmap(struct scsi_cmnd *cmd) { }
184 #endif /* !CONFIG_SCSI_DMA */
186 static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
188 return cmd->sdb.table.nents;
191 static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd)
193 return cmd->sdb.table.sgl;
196 static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
198 return cmd->sdb.length;
201 static inline void scsi_set_resid(struct scsi_cmnd *cmd, unsigned int resid)
203 cmd->req.resid_len = resid;
206 static inline unsigned int scsi_get_resid(struct scsi_cmnd *cmd)
208 return cmd->req.resid_len;
211 #define scsi_for_each_sg(cmd, sg, nseg, __i) \
212 for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
214 static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
215 void *buf, int buflen)
217 return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
221 static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
222 void *buf, int buflen)
224 return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
228 static inline sector_t scsi_get_sector(struct scsi_cmnd *scmd)
230 return blk_rq_pos(scsi_cmd_to_rq(scmd));
233 static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
235 unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;
237 return blk_rq_pos(scsi_cmd_to_rq(scmd)) >> shift;
240 static inline unsigned int scsi_logical_block_count(struct scsi_cmnd *scmd)
242 unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;
244 return blk_rq_bytes(scsi_cmd_to_rq(scmd)) >> shift;
248 * The operations below are hints that tell the controller driver how
249 * to handle I/Os with DIF or similar types of protection information.
251 enum scsi_prot_operations {
253 SCSI_PROT_NORMAL = 0,
255 /* OS-HBA: Protected, HBA-Target: Unprotected */
256 SCSI_PROT_READ_INSERT,
257 SCSI_PROT_WRITE_STRIP,
259 /* OS-HBA: Unprotected, HBA-Target: Protected */
260 SCSI_PROT_READ_STRIP,
261 SCSI_PROT_WRITE_INSERT,
263 /* OS-HBA: Protected, HBA-Target: Protected */
265 SCSI_PROT_WRITE_PASS,
268 static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
273 static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
275 return scmd->prot_op;
278 enum scsi_prot_flags {
279 SCSI_PROT_TRANSFER_PI = 1 << 0,
280 SCSI_PROT_GUARD_CHECK = 1 << 1,
281 SCSI_PROT_REF_CHECK = 1 << 2,
282 SCSI_PROT_REF_INCREMENT = 1 << 3,
283 SCSI_PROT_IP_CHECKSUM = 1 << 4,
287 * The controller usually does not know anything about the target it
288 * is communicating with. However, when DIX is enabled the controller
289 * must be know target type so it can verify the protection
290 * information passed along with the I/O.
292 enum scsi_prot_target_type {
293 SCSI_PROT_DIF_TYPE0 = 0,
299 static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
301 scmd->prot_type = type;
304 static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
306 return scmd->prot_type;
309 static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
311 struct request *rq = blk_mq_rq_from_pdu(scmd);
313 return t10_pi_ref_tag(rq);
316 static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd)
318 return scmd->device->sector_size;
321 static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
323 return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
326 static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd)
328 return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
331 static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd)
333 return cmd->prot_sdb;
336 #define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
337 for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
339 static inline void set_status_byte(struct scsi_cmnd *cmd, char status)
341 cmd->result = (cmd->result & 0xffffff00) | status;
344 static inline u8 get_status_byte(struct scsi_cmnd *cmd)
346 return cmd->result & 0xff;
349 static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
351 cmd->result = (cmd->result & 0xff00ffff) | (status << 16);
354 static inline u8 get_host_byte(struct scsi_cmnd *cmd)
356 return (cmd->result >> 16) & 0xff;
360 * scsi_msg_to_host_byte() - translate message byte
362 * Translate the SCSI parallel message byte to a matching
363 * host byte setting. A message of COMMAND_COMPLETE indicates
364 * a successful command execution, any other message indicate
365 * an error. As the messages themselves only have a meaning
366 * for the SCSI parallel protocol this function translates
367 * them into a matching host byte value for SCSI EH.
369 static inline void scsi_msg_to_host_byte(struct scsi_cmnd *cmd, u8 msg)
372 case COMMAND_COMPLETE:
375 set_host_byte(cmd, DID_ABORT);
378 set_host_byte(cmd, DID_RESET);
381 set_host_byte(cmd, DID_ERROR);
386 static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
388 unsigned int xfer_len = scmd->sdb.length;
389 unsigned int prot_interval = scsi_prot_interval(scmd);
391 if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI)
392 xfer_len += (xfer_len >> ilog2(prot_interval)) * 8;
397 extern void scsi_build_sense(struct scsi_cmnd *scmd, int desc,
398 u8 key, u8 asc, u8 ascq);
400 #endif /* _SCSI_SCSI_CMND_H */