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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
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 struct scsi_disk {
71         struct scsi_device *device;
72
73         /*
74          * disk_dev is used to show attributes in /sys/class/scsi_disk/,
75          * but otherwise not really needed.  Do not use for refcounting.
76          */
77         struct device   disk_dev;
78         struct gendisk  *disk;
79         struct opal_dev *opal_dev;
80 #ifdef CONFIG_BLK_DEV_ZONED
81         u32             nr_zones;
82         u32             rev_nr_zones;
83         u32             zone_blocks;
84         u32             rev_zone_blocks;
85         u32             zones_optimal_open;
86         u32             zones_optimal_nonseq;
87         u32             zones_max_open;
88         u32             *zones_wp_offset;
89         spinlock_t      zones_wp_offset_lock;
90         u32             *rev_wp_offset;
91         struct mutex    rev_mutex;
92         struct work_struct zone_wp_offset_work;
93         char            *zone_wp_update_buf;
94 #endif
95         atomic_t        openers;
96         sector_t        capacity;       /* size in logical blocks */
97         int             max_retries;
98         u32             max_xfer_blocks;
99         u32             opt_xfer_blocks;
100         u32             max_ws_blocks;
101         u32             max_unmap_blocks;
102         u32             unmap_granularity;
103         u32             unmap_alignment;
104         u32             index;
105         unsigned int    physical_block_size;
106         unsigned int    max_medium_access_timeouts;
107         unsigned int    medium_access_timed_out;
108         u8              media_present;
109         u8              write_prot;
110         u8              protection_type;/* Data Integrity Field */
111         u8              provisioning_mode;
112         u8              zeroing_mode;
113         u8              nr_actuators;           /* Number of actuators */
114         unsigned        ATO : 1;        /* state of disk ATO bit */
115         unsigned        cache_override : 1; /* temp override of WCE,RCD */
116         unsigned        WCE : 1;        /* state of disk WCE bit */
117         unsigned        RCD : 1;        /* state of disk RCD bit, unused */
118         unsigned        DPOFUA : 1;     /* state of disk DPOFUA bit */
119         unsigned        first_scan : 1;
120         unsigned        lbpme : 1;
121         unsigned        lbprz : 1;
122         unsigned        lbpu : 1;
123         unsigned        lbpws : 1;
124         unsigned        lbpws10 : 1;
125         unsigned        lbpvpd : 1;
126         unsigned        ws10 : 1;
127         unsigned        ws16 : 1;
128         unsigned        rc_basis: 2;
129         unsigned        zoned: 2;
130         unsigned        urswrz : 1;
131         unsigned        security : 1;
132         unsigned        ignore_medium_access_errors : 1;
133 };
134 #define to_scsi_disk(obj) container_of(obj, struct scsi_disk, disk_dev)
135
136 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
137 {
138         return disk->private_data;
139 }
140
141 #define sd_printk(prefix, sdsk, fmt, a...)                              \
142         (sdsk)->disk ?                                                  \
143               sdev_prefix_printk(prefix, (sdsk)->device,                \
144                                  (sdsk)->disk->disk_name, fmt, ##a) :   \
145               sdev_printk(prefix, (sdsk)->device, fmt, ##a)
146
147 #define sd_first_printk(prefix, sdsk, fmt, a...)                        \
148         do {                                                            \
149                 if ((sdsk)->first_scan)                                 \
150                         sd_printk(prefix, sdsk, fmt, ##a);              \
151         } while (0)
152
153 static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
154 {
155         switch (scmd->cmnd[0]) {
156         case READ_6:
157         case READ_10:
158         case READ_12:
159         case READ_16:
160         case SYNCHRONIZE_CACHE:
161         case VERIFY:
162         case VERIFY_12:
163         case VERIFY_16:
164         case WRITE_6:
165         case WRITE_10:
166         case WRITE_12:
167         case WRITE_16:
168         case WRITE_SAME:
169         case WRITE_SAME_16:
170         case UNMAP:
171                 return 1;
172         case VARIABLE_LENGTH_CMD:
173                 switch (scmd->cmnd[9]) {
174                 case READ_32:
175                 case VERIFY_32:
176                 case WRITE_32:
177                 case WRITE_SAME_32:
178                         return 1;
179                 }
180         }
181
182         return 0;
183 }
184
185 static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks)
186 {
187         return blocks << (ilog2(sdev->sector_size) - 9);
188 }
189
190 static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks)
191 {
192         return blocks * sdev->sector_size;
193 }
194
195 static inline sector_t bytes_to_logical(struct scsi_device *sdev, unsigned int bytes)
196 {
197         return bytes >> ilog2(sdev->sector_size);
198 }
199
200 static inline sector_t sectors_to_logical(struct scsi_device *sdev, sector_t sector)
201 {
202         return sector >> (ilog2(sdev->sector_size) - 9);
203 }
204
205 #ifdef CONFIG_BLK_DEV_INTEGRITY
206
207 extern void sd_dif_config_host(struct scsi_disk *);
208
209 #else /* CONFIG_BLK_DEV_INTEGRITY */
210
211 static inline void sd_dif_config_host(struct scsi_disk *disk)
212 {
213 }
214
215 #endif /* CONFIG_BLK_DEV_INTEGRITY */
216
217 static inline int sd_is_zoned(struct scsi_disk *sdkp)
218 {
219         return sdkp->zoned == 1 || sdkp->device->type == TYPE_ZBC;
220 }
221
222 #ifdef CONFIG_BLK_DEV_ZONED
223
224 void sd_zbc_release_disk(struct scsi_disk *sdkp);
225 int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buffer);
226 int sd_zbc_revalidate_zones(struct scsi_disk *sdkp);
227 blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
228                                          unsigned char op, bool all);
229 unsigned int sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
230                              struct scsi_sense_hdr *sshdr);
231 int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
232                 unsigned int nr_zones, report_zones_cb cb, void *data);
233
234 blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
235                                         unsigned int nr_blocks);
236
237 #else /* CONFIG_BLK_DEV_ZONED */
238
239 static inline void sd_zbc_release_disk(struct scsi_disk *sdkp) {}
240
241 static inline int sd_zbc_read_zones(struct scsi_disk *sdkp,
242                                     unsigned char *buf)
243 {
244         return 0;
245 }
246
247 static inline int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
248 {
249         return 0;
250 }
251
252 static inline blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
253                                                        unsigned char op,
254                                                        bool all)
255 {
256         return BLK_STS_TARGET;
257 }
258
259 static inline unsigned int sd_zbc_complete(struct scsi_cmnd *cmd,
260                         unsigned int good_bytes, struct scsi_sense_hdr *sshdr)
261 {
262         return good_bytes;
263 }
264
265 static inline blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd,
266                                                       sector_t *lba,
267                                                       unsigned int nr_blocks)
268 {
269         return BLK_STS_TARGET;
270 }
271
272 #define sd_zbc_report_zones NULL
273
274 #endif /* CONFIG_BLK_DEV_ZONED */
275
276 void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr);
277 void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result);
278
279 #endif /* _SCSI_DISK_H */
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