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
42 enum {
43 SD_EXT_CDB_SIZE = 32, /* Extended CDB size */
44 SD_MEMPOOL_SIZE = 2, /* CDB pool size */
45 };
46
47 enum {
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
54 enum {
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
63 enum {
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
70 /**
71 * struct zoned_disk_info - Specific properties of a ZBC SCSI device.
72 * @nr_zones: number of zones.
73 * @zone_blocks: number of logical blocks per zone.
74 *
75 * This data structure holds the ZBC SCSI device properties that are retrieved
76 * twice: a first time before the gendisk capacity is known and a second time
77 * after the gendisk capacity is known.
78 */
79 struct zoned_disk_info {
80 u32 nr_zones;
81 u32 zone_blocks;
82 };
83
84 struct scsi_disk {
85 struct scsi_device *device;
86
87 /*
88 * disk_dev is used to show attributes in /sys/class/scsi_disk/,
89 * but otherwise not really needed. Do not use for refcounting.
90 */
91 struct device disk_dev;
92 struct gendisk *disk;
93 struct opal_dev *opal_dev;
94 #ifdef CONFIG_BLK_DEV_ZONED
95 /* Updated during revalidation before the gendisk capacity is known. */
96 struct zoned_disk_info early_zone_info;
97 /* Updated during revalidation after the gendisk capacity is known. */
98 struct zoned_disk_info zone_info;
99 u32 zones_optimal_open;
100 u32 zones_optimal_nonseq;
101 u32 zones_max_open;
102 /*
103 * Either zero or a power of two. If not zero it means that the offset
104 * between zone starting LBAs is constant.
105 */
106 u32 zone_starting_lba_gran;
107 #endif
108 atomic_t openers;
109 sector_t capacity; /* size in logical blocks */
110 int max_retries;
111 u32 min_xfer_blocks;
112 u32 max_xfer_blocks;
113 u32 opt_xfer_blocks;
114 u32 max_ws_blocks;
115 u32 max_unmap_blocks;
116 u32 unmap_granularity;
117 u32 unmap_alignment;
118
119 u32 max_atomic;
120 u32 atomic_alignment;
121 u32 atomic_granularity;
122 u32 max_atomic_with_boundary;
123 u32 max_atomic_boundary;
124
125 u32 index;
126 unsigned int physical_block_size;
127 unsigned int max_medium_access_timeouts;
128 unsigned int medium_access_timed_out;
129 /* number of permanent streams */
130 u16 permanent_stream_count;
131 u8 media_present;
132 u8 write_prot;
133 u8 protection_type;/* Data Integrity Field */
134 u8 provisioning_mode;
135 u8 zeroing_mode;
136 u8 nr_actuators; /* Number of actuators */
137 bool suspended; /* Disk is suspended (stopped) */
138 unsigned ATO : 1; /* state of disk ATO bit */
139 unsigned cache_override : 1; /* temp override of WCE,RCD */
140 unsigned WCE : 1; /* state of disk WCE bit */
141 unsigned RCD : 1; /* state of disk RCD bit, unused */
142 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
143 unsigned first_scan : 1;
144 unsigned lbpme : 1;
145 unsigned lbprz : 1;
146 unsigned lbpu : 1;
147 unsigned lbpws : 1;
148 unsigned lbpws10 : 1;
149 unsigned lbpvpd : 1;
150 unsigned ws10 : 1;
151 unsigned ws16 : 1;
152 unsigned rc_basis: 2;
153 unsigned zoned: 2;
154 unsigned urswrz : 1;
155 unsigned security : 1;
156 unsigned ignore_medium_access_errors : 1;
157 unsigned rscs : 1; /* reduced stream control support */
158 unsigned use_atomic_write_boundary : 1;
159 };
160 #define to_scsi_disk(obj) container_of(obj, struct scsi_disk, disk_dev)
161
scsi_disk(struct gendisk * disk)162 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
163 {
164 return disk->private_data;
165 }
166
167 #define sd_printk(prefix, sdsk, fmt, a...) \
168 (sdsk)->disk ? \
169 sdev_prefix_printk(prefix, (sdsk)->device, \
170 (sdsk)->disk->disk_name, fmt, ##a) : \
171 sdev_printk(prefix, (sdsk)->device, fmt, ##a)
172
173 #define sd_first_printk(prefix, sdsk, fmt, a...) \
174 do { \
175 if ((sdsk)->first_scan) \
176 sd_printk(prefix, sdsk, fmt, ##a); \
177 } while (0)
178
scsi_medium_access_command(struct scsi_cmnd * scmd)179 static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
180 {
181 switch (scmd->cmnd[0]) {
182 case READ_6:
183 case READ_10:
184 case READ_12:
185 case READ_16:
186 case SYNCHRONIZE_CACHE:
187 case VERIFY:
188 case VERIFY_12:
189 case VERIFY_16:
190 case WRITE_6:
191 case WRITE_10:
192 case WRITE_12:
193 case WRITE_16:
194 case WRITE_SAME:
195 case WRITE_SAME_16:
196 case UNMAP:
197 return 1;
198 case VARIABLE_LENGTH_CMD:
199 switch (scmd->cmnd[9]) {
200 case READ_32:
201 case VERIFY_32:
202 case WRITE_32:
203 case WRITE_SAME_32:
204 return 1;
205 }
206 }
207
208 return 0;
209 }
210
logical_to_sectors(struct scsi_device * sdev,sector_t blocks)211 static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks)
212 {
213 return blocks << (ilog2(sdev->sector_size) - 9);
214 }
215
logical_to_bytes(struct scsi_device * sdev,sector_t blocks)216 static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks)
217 {
218 return blocks * sdev->sector_size;
219 }
220
bytes_to_logical(struct scsi_device * sdev,unsigned int bytes)221 static inline sector_t bytes_to_logical(struct scsi_device *sdev, unsigned int bytes)
222 {
223 return bytes >> ilog2(sdev->sector_size);
224 }
225
sectors_to_logical(struct scsi_device * sdev,sector_t sector)226 static inline sector_t sectors_to_logical(struct scsi_device *sdev, sector_t sector)
227 {
228 return sector >> (ilog2(sdev->sector_size) - 9);
229 }
230
231 void sd_dif_config_host(struct scsi_disk *sdkp, struct queue_limits *lim);
232
233 #ifdef CONFIG_BLK_DEV_ZONED
234
235 int sd_zbc_read_zones(struct scsi_disk *sdkp, struct queue_limits *lim,
236 u8 buf[SD_BUF_SIZE]);
237 int sd_zbc_revalidate_zones(struct scsi_disk *sdkp);
238 blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
239 unsigned char op, bool all);
240 unsigned int sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
241 struct scsi_sense_hdr *sshdr);
242 int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
243 unsigned int nr_zones, report_zones_cb cb, void *data);
244
245 #else /* CONFIG_BLK_DEV_ZONED */
246
sd_zbc_read_zones(struct scsi_disk * sdkp,struct queue_limits * lim,u8 buf[SD_BUF_SIZE])247 static inline int sd_zbc_read_zones(struct scsi_disk *sdkp,
248 struct queue_limits *lim, u8 buf[SD_BUF_SIZE])
249 {
250 return 0;
251 }
252
sd_zbc_revalidate_zones(struct scsi_disk * sdkp)253 static inline int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
254 {
255 return 0;
256 }
257
sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd * cmd,unsigned char op,bool all)258 static inline blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
259 unsigned char op,
260 bool all)
261 {
262 return BLK_STS_TARGET;
263 }
264
sd_zbc_complete(struct scsi_cmnd * cmd,unsigned int good_bytes,struct scsi_sense_hdr * sshdr)265 static inline unsigned int sd_zbc_complete(struct scsi_cmnd *cmd,
266 unsigned int good_bytes, struct scsi_sense_hdr *sshdr)
267 {
268 return good_bytes;
269 }
270
271 #define sd_zbc_report_zones NULL
272
273 #endif /* CONFIG_BLK_DEV_ZONED */
274
275 void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr);
276 void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result);
277
278 #endif /* _SCSI_DISK_H */
279