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_request.h>
19 * MAX_COMMAND_SIZE is:
20 * The longest fixed-length SCSI CDB as per the SCSI standard.
21 * fixed-length means: commands that their size can be determined
22 * by their opcode and the CDB does not carry a length specifier, (unlike
23 * the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
24 * true and the SCSI standard also defines extended commands and
25 * vendor specific commands that can be bigger than 16 bytes. The kernel
26 * will support these using the same infrastructure used for VARLEN CDB's.
27 * So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
28 * supports without specifying a cmd_len by ULD's
30 #define MAX_COMMAND_SIZE 16
31 #if (MAX_COMMAND_SIZE > BLK_MAX_CDB)
32 # error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
35 struct scsi_data_buffer {
36 struct sg_table table;
40 /* embedded in scsi_cmnd */
42 char *ptr; /* data pointer */
43 int this_residual; /* left in this buffer */
44 struct scatterlist *buffer; /* which buffer */
45 int buffers_residual; /* how many buffers left */
47 dma_addr_t dma_handle;
51 volatile int have_data_in;
52 volatile int sent_command;
57 #define SCMD_TAGGED (1 << 0)
58 #define SCMD_UNCHECKED_ISA_DMA (1 << 1)
59 #define SCMD_INITIALIZED (1 << 2)
60 #define SCMD_LAST (1 << 3)
61 /* flags preserved across unprep / reprep */
62 #define SCMD_PRESERVED_FLAGS (SCMD_UNCHECKED_ISA_DMA | 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 */
79 * This is set to jiffies as it was when the command was first
80 * allocated. It is used to time how long the command has
83 unsigned long jiffies_at_alloc;
88 unsigned char prot_op;
89 unsigned char prot_type;
90 unsigned char prot_flags;
92 unsigned short cmd_len;
93 enum dma_data_direction sc_data_direction;
95 /* These elements define the operation we are about to perform */
99 /* These elements define the operation we ultimately want to perform */
100 struct scsi_data_buffer sdb;
101 struct scsi_data_buffer *prot_sdb;
103 unsigned underflow; /* Return error if less than
104 this amount is transferred */
106 unsigned transfersize; /* How much we are guaranteed to
107 transfer with each SCSI transfer
108 (ie, between disconnect /
109 reconnects. Probably == sector
112 struct request *request; /* The command we are
115 unsigned char *sense_buffer;
116 /* obtained by REQUEST SENSE when
117 * CHECK CONDITION is received on original
118 * command (auto-sense). Length must be
119 * SCSI_SENSE_BUFFERSIZE bytes. */
121 /* Low-level done function - can be used by low-level driver to point
122 * to completion function. Not used by mid/upper level code. */
123 void (*scsi_done) (struct scsi_cmnd *);
126 * The following fields can be written to by the host specific code.
127 * Everything else should be left alone.
129 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
131 unsigned char *host_scribble; /* The host adapter is allowed to
132 * call scsi_malloc and get some memory
133 * and hang it here. The host adapter
134 * is also expected to call scsi_free
135 * to release this memory. (The memory
136 * obtained by scsi_malloc is guaranteed
137 * to be at an address < 16Mb). */
139 int result; /* Status code from lower level driver */
140 int flags; /* Command flags */
141 unsigned long state; /* Command completion state */
143 unsigned char tag; /* SCSI-II queued command tag */
144 unsigned int extra_len; /* length of alignment and padding */
147 /* Variant of blk_mq_rq_from_pdu() that verifies the type of its argument. */
148 static inline struct request *scsi_cmd_to_rq(struct scsi_cmnd *scmd)
150 return blk_mq_rq_from_pdu(scmd);
154 * Return the driver private allocation behind the command.
155 * Only works if cmd_size is set in the host template.
157 static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd)
162 /* make sure not to use it with passthrough commands */
163 static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
165 return *(struct scsi_driver **)cmd->request->rq_disk->private_data;
168 extern void scsi_finish_command(struct scsi_cmnd *cmd);
170 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
171 size_t *offset, size_t *len);
172 extern void scsi_kunmap_atomic_sg(void *virt);
174 blk_status_t scsi_alloc_sgtables(struct scsi_cmnd *cmd);
175 void scsi_free_sgtables(struct scsi_cmnd *cmd);
177 #ifdef CONFIG_SCSI_DMA
178 extern int scsi_dma_map(struct scsi_cmnd *cmd);
179 extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
180 #else /* !CONFIG_SCSI_DMA */
181 static inline int scsi_dma_map(struct scsi_cmnd *cmd) { return -ENOSYS; }
182 static inline void scsi_dma_unmap(struct scsi_cmnd *cmd) { }
183 #endif /* !CONFIG_SCSI_DMA */
185 static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
187 return cmd->sdb.table.nents;
190 static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd)
192 return cmd->sdb.table.sgl;
195 static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
197 return cmd->sdb.length;
200 static inline void scsi_set_resid(struct scsi_cmnd *cmd, unsigned int resid)
202 cmd->req.resid_len = resid;
205 static inline unsigned int scsi_get_resid(struct scsi_cmnd *cmd)
207 return cmd->req.resid_len;
210 #define scsi_for_each_sg(cmd, sg, nseg, __i) \
211 for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
213 static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
214 const 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;
258 enum scsi_prot_flags {
259 SCSI_PROT_TRANSFER_PI = 1 << 0,
260 SCSI_PROT_GUARD_CHECK = 1 << 1,
261 SCSI_PROT_REF_CHECK = 1 << 2,
262 SCSI_PROT_REF_INCREMENT = 1 << 3,
263 SCSI_PROT_IP_CHECKSUM = 1 << 4,
267 * The controller usually does not know anything about the target it
268 * is communicating with. However, when DIX is enabled the controller
269 * must be know target type so it can verify the protection
270 * information passed along with the I/O.
272 enum scsi_prot_target_type {
273 SCSI_PROT_DIF_TYPE0 = 0,
279 static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
281 scmd->prot_type = type;
284 static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
286 return scmd->prot_type;
289 static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
291 return blk_rq_pos(scmd->request);
294 static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd)
296 return scmd->device->sector_size;
299 static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
301 return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
304 static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd)
306 return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
309 static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd)
311 return cmd->prot_sdb;
314 #define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
315 for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
317 static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
319 cmd->result = (cmd->result & 0xffff00ff) | (status << 8);
322 static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
324 cmd->result = (cmd->result & 0xff00ffff) | (status << 16);
327 static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
329 cmd->result = (cmd->result & 0x00ffffff) | (status << 24);
332 static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
334 unsigned int xfer_len = scmd->sdb.length;
335 unsigned int prot_interval = scsi_prot_interval(scmd);
337 if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI)
338 xfer_len += (xfer_len >> ilog2(prot_interval)) * 8;
343 #endif /* _SCSI_SCSI_CMND_H */