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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _SCSI_DISK_H
3#define _SCSI_DISK_H
4
5/*
6 * More than enough for everybody ;) The huge number of majors
7 * is a leftover from 16bit dev_t days, we don't really need that
8 * much numberspace.
9 */
10#define SD_MAJORS 16
11
12/*
13 * Time out in seconds for disks and Magneto-opticals (which are slower).
14 */
15#define SD_TIMEOUT (30 * HZ)
16#define SD_MOD_TIMEOUT (75 * HZ)
17/*
18 * Flush timeout is a multiplier over the standard device timeout which is
19 * user modifiable via sysfs but initially set to SD_TIMEOUT
20 */
21#define SD_FLUSH_TIMEOUT_MULTIPLIER 2
22#define SD_WRITE_SAME_TIMEOUT (120 * HZ)
23
24/*
25 * Number of allowed retries
26 */
27#define SD_MAX_RETRIES 5
28#define SD_PASSTHROUGH_RETRIES 1
29#define SD_MAX_MEDIUM_TIMEOUTS 2
30
31/*
32 * Size of the initial data buffer for mode and read capacity data
33 */
34#define SD_BUF_SIZE 512
35
36/*
37 * Number of sectors at the end of the device to avoid multi-sector
38 * accesses to in the case of last_sector_bug
39 */
40#define SD_LAST_BUGGY_SECTORS 8
41
42enum {
43 SD_EXT_CDB_SIZE = 32, /* Extended CDB size */
44 SD_MEMPOOL_SIZE = 2, /* CDB pool size */
45};
46
47enum {
48 SD_DEF_XFER_BLOCKS = 0xffff,
49 SD_MAX_XFER_BLOCKS = 0xffffffff,
50 SD_MAX_WS10_BLOCKS = 0xffff,
51 SD_MAX_WS16_BLOCKS = 0x7fffff,
52};
53
54enum {
55 SD_LBP_FULL = 0, /* Full logical block provisioning */
56 SD_LBP_UNMAP, /* Use UNMAP command */
57 SD_LBP_WS16, /* Use WRITE SAME(16) with UNMAP bit */
58 SD_LBP_WS10, /* Use WRITE SAME(10) with UNMAP bit */
59 SD_LBP_ZERO, /* Use WRITE SAME(10) with zero payload */
60 SD_LBP_DISABLE, /* Discard disabled due to failed cmd */
61};
62
63enum {
64 SD_ZERO_WRITE = 0, /* Use WRITE(10/16) command */
65 SD_ZERO_WS, /* Use WRITE SAME(10/16) command */
66 SD_ZERO_WS16_UNMAP, /* Use WRITE SAME(16) with UNMAP */
67 SD_ZERO_WS10_UNMAP, /* Use WRITE SAME(10) with UNMAP */
68};
69
70struct scsi_disk {
71 struct scsi_driver *driver; /* always &sd_template */
72 struct scsi_device *device;
73 struct device dev;
74 struct gendisk *disk;
75 struct opal_dev *opal_dev;
76#ifdef CONFIG_BLK_DEV_ZONED
77 u32 nr_zones;
78 u32 zone_blocks;
79 u32 zone_shift;
80 u32 zones_optimal_open;
81 u32 zones_optimal_nonseq;
82 u32 zones_max_open;
83#endif
84 atomic_t openers;
85 sector_t capacity; /* size in logical blocks */
86 u32 max_xfer_blocks;
87 u32 opt_xfer_blocks;
88 u32 max_ws_blocks;
89 u32 max_unmap_blocks;
90 u32 unmap_granularity;
91 u32 unmap_alignment;
92 u32 index;
93 unsigned int physical_block_size;
94 unsigned int max_medium_access_timeouts;
95 unsigned int medium_access_timed_out;
96 u8 media_present;
97 u8 write_prot;
98 u8 protection_type;/* Data Integrity Field */
99 u8 provisioning_mode;
100 u8 zeroing_mode;
101 unsigned ATO : 1; /* state of disk ATO bit */
102 unsigned cache_override : 1; /* temp override of WCE,RCD */
103 unsigned WCE : 1; /* state of disk WCE bit */
104 unsigned RCD : 1; /* state of disk RCD bit, unused */
105 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
106 unsigned first_scan : 1;
107 unsigned lbpme : 1;
108 unsigned lbprz : 1;
109 unsigned lbpu : 1;
110 unsigned lbpws : 1;
111 unsigned lbpws10 : 1;
112 unsigned lbpvpd : 1;
113 unsigned ws10 : 1;
114 unsigned ws16 : 1;
115 unsigned rc_basis: 2;
116 unsigned zoned: 2;
117 unsigned urswrz : 1;
118 unsigned security : 1;
119 unsigned ignore_medium_access_errors : 1;
120};
121#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
122
123static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
124{
125 return container_of(disk->private_data, struct scsi_disk, driver);
126}
127
128#define sd_printk(prefix, sdsk, fmt, a...) \
129 (sdsk)->disk ? \
130 sdev_prefix_printk(prefix, (sdsk)->device, \
131 (sdsk)->disk->disk_name, fmt, ##a) : \
132 sdev_printk(prefix, (sdsk)->device, fmt, ##a)
133
134#define sd_first_printk(prefix, sdsk, fmt, a...) \
135 do { \
136 if ((sdkp)->first_scan) \
137 sd_printk(prefix, sdsk, fmt, ##a); \
138 } while (0)
139
140static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
141{
142 switch (scmd->cmnd[0]) {
143 case READ_6:
144 case READ_10:
145 case READ_12:
146 case READ_16:
147 case SYNCHRONIZE_CACHE:
148 case VERIFY:
149 case VERIFY_12:
150 case VERIFY_16:
151 case WRITE_6:
152 case WRITE_10:
153 case WRITE_12:
154 case WRITE_16:
155 case WRITE_SAME:
156 case WRITE_SAME_16:
157 case UNMAP:
158 return 1;
159 case VARIABLE_LENGTH_CMD:
160 switch (scmd->cmnd[9]) {
161 case READ_32:
162 case VERIFY_32:
163 case WRITE_32:
164 case WRITE_SAME_32:
165 return 1;
166 }
167 }
168
169 return 0;
170}
171
172static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks)
173{
174 return blocks << (ilog2(sdev->sector_size) - 9);
175}
176
177static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks)
178{
179 return blocks * sdev->sector_size;
180}
181
182static inline sector_t bytes_to_logical(struct scsi_device *sdev, unsigned int bytes)
183{
184 return bytes >> ilog2(sdev->sector_size);
185}
186
187static inline sector_t sectors_to_logical(struct scsi_device *sdev, sector_t sector)
188{
189 return sector >> (ilog2(sdev->sector_size) - 9);
190}
191
192/*
193 * Look up the DIX operation based on whether the command is read or
194 * write and whether dix and dif are enabled.
195 */
196static inline unsigned int sd_prot_op(bool write, bool dix, bool dif)
197{
198 /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
199 const unsigned int ops[] = { /* wrt dix dif */
200 SCSI_PROT_NORMAL, /* 0 0 0 */
201 SCSI_PROT_READ_STRIP, /* 0 0 1 */
202 SCSI_PROT_READ_INSERT, /* 0 1 0 */
203 SCSI_PROT_READ_PASS, /* 0 1 1 */
204 SCSI_PROT_NORMAL, /* 1 0 0 */
205 SCSI_PROT_WRITE_INSERT, /* 1 0 1 */
206 SCSI_PROT_WRITE_STRIP, /* 1 1 0 */
207 SCSI_PROT_WRITE_PASS, /* 1 1 1 */
208 };
209
210 return ops[write << 2 | dix << 1 | dif];
211}
212
213/*
214 * Returns a mask of the protection flags that are valid for a given DIX
215 * operation.
216 */
217static inline unsigned int sd_prot_flag_mask(unsigned int prot_op)
218{
219 const unsigned int flag_mask[] = {
220 [SCSI_PROT_NORMAL] = 0,
221
222 [SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI |
223 SCSI_PROT_GUARD_CHECK |
224 SCSI_PROT_REF_CHECK |
225 SCSI_PROT_REF_INCREMENT,
226
227 [SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT |
228 SCSI_PROT_IP_CHECKSUM,
229
230 [SCSI_PROT_READ_PASS] = SCSI_PROT_TRANSFER_PI |
231 SCSI_PROT_GUARD_CHECK |
232 SCSI_PROT_REF_CHECK |
233 SCSI_PROT_REF_INCREMENT |
234 SCSI_PROT_IP_CHECKSUM,
235
236 [SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI |
237 SCSI_PROT_REF_INCREMENT,
238
239 [SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK |
240 SCSI_PROT_REF_CHECK |
241 SCSI_PROT_REF_INCREMENT |
242 SCSI_PROT_IP_CHECKSUM,
243
244 [SCSI_PROT_WRITE_PASS] = SCSI_PROT_TRANSFER_PI |
245 SCSI_PROT_GUARD_CHECK |
246 SCSI_PROT_REF_CHECK |
247 SCSI_PROT_REF_INCREMENT |
248 SCSI_PROT_IP_CHECKSUM,
249 };
250
251 return flag_mask[prot_op];
252}
253
254#ifdef CONFIG_BLK_DEV_INTEGRITY
255
256extern void sd_dif_config_host(struct scsi_disk *);
257extern void sd_dif_prepare(struct scsi_cmnd *scmd);
258extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
259
260#else /* CONFIG_BLK_DEV_INTEGRITY */
261
262static inline void sd_dif_config_host(struct scsi_disk *disk)
263{
264}
265static inline int sd_dif_prepare(struct scsi_cmnd *scmd)
266{
267 return 0;
268}
269static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
270{
271}
272
273#endif /* CONFIG_BLK_DEV_INTEGRITY */
274
275static inline int sd_is_zoned(struct scsi_disk *sdkp)
276{
277 return sdkp->zoned == 1 || sdkp->device->type == TYPE_ZBC;
278}
279
280#ifdef CONFIG_BLK_DEV_ZONED
281
282extern int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buffer);
283extern void sd_zbc_remove(struct scsi_disk *sdkp);
284extern void sd_zbc_print_zones(struct scsi_disk *sdkp);
285extern int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd);
286extern int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd);
287extern void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
288 struct scsi_sense_hdr *sshdr);
289
290#else /* CONFIG_BLK_DEV_ZONED */
291
292static inline int sd_zbc_read_zones(struct scsi_disk *sdkp,
293 unsigned char *buf)
294{
295 return 0;
296}
297
298static inline void sd_zbc_remove(struct scsi_disk *sdkp) {}
299
300static inline void sd_zbc_print_zones(struct scsi_disk *sdkp) {}
301
302static inline int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
303{
304 return BLKPREP_INVALID;
305}
306
307static inline int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
308{
309 return BLKPREP_INVALID;
310}
311
312static inline void sd_zbc_complete(struct scsi_cmnd *cmd,
313 unsigned int good_bytes,
314 struct scsi_sense_hdr *sshdr) {}
315
316#endif /* CONFIG_BLK_DEV_ZONED */
317
318#endif /* _SCSI_DISK_H */