drivers/scsi/sd.h

   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         u32             *zones_wp_offset;
 108         spinlock_t      zones_wp_offset_lock;
 109         u32             *rev_wp_offset;
 110         struct mutex    rev_mutex;
 111         struct work_struct zone_wp_offset_work;
 112         char            *zone_wp_update_buf;
 113 #endif
 114         atomic_t        openers;
 115         sector_t        capacity;       /* size in logical blocks */
 116         int             max_retries;
 117         u32             min_xfer_blocks;
 118         u32             max_xfer_blocks;
 119         u32             opt_xfer_blocks;
 120         u32             max_ws_blocks;
 121         u32             max_unmap_blocks;
 122         u32             unmap_granularity;
 123         u32             unmap_alignment;
 124         u32             index;
 125         unsigned int    physical_block_size;
 126         unsigned int    max_medium_access_timeouts;
 127         unsigned int    medium_access_timed_out;
 128         u8              media_present;
 129         u8              write_prot;
 130         u8              protection_type;/* Data Integrity Field */
 131         u8              provisioning_mode;
 132         u8              zeroing_mode;
 133         u8              nr_actuators;           /* Number of actuators */
 134         unsigned        ATO : 1;        /* state of disk ATO bit */
 135         unsigned        cache_override : 1; /* temp override of WCE,RCD */
 136         unsigned        WCE : 1;        /* state of disk WCE bit */
 137         unsigned        RCD : 1;        /* state of disk RCD bit, unused */
 138         unsigned        DPOFUA : 1;     /* state of disk DPOFUA bit */
 139         unsigned        first_scan : 1;
 140         unsigned        lbpme : 1;
 141         unsigned        lbprz : 1;
 142         unsigned        lbpu : 1;
 143         unsigned        lbpws : 1;
 144         unsigned        lbpws10 : 1;
 145         unsigned        lbpvpd : 1;
 146         unsigned        ws10 : 1;
 147         unsigned        ws16 : 1;
 148         unsigned        rc_basis: 2;
 149         unsigned        zoned: 2;
 150         unsigned        urswrz : 1;
 151         unsigned        security : 1;
 152         unsigned        ignore_medium_access_errors : 1;
 153
 154         int             start_result;
 155         u32             start_sense_len;
 156         u8              start_sense_buffer[SCSI_SENSE_BUFFERSIZE];
 157         struct work_struct start_done_work;
 158 };
 159 #define to_scsi_disk(obj) container_of(obj, struct scsi_disk, disk_dev)
 160
 161 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
 162 {
 163         return disk->private_data;
 164 }
 165
 166 #define sd_printk(prefix, sdsk, fmt, a...)                              \
 167         (sdsk)->disk ?                                                  \
 168               sdev_prefix_printk(prefix, (sdsk)->device,                \
 169                                  (sdsk)->disk->disk_name, fmt, ##a) :   \
 170               sdev_printk(prefix, (sdsk)->device, fmt, ##a)
 171
 172 #define sd_first_printk(prefix, sdsk, fmt, a...)                        \
 173         do {                                                            \
 174                 if ((sdsk)->first_scan)                                 \
 175                         sd_printk(prefix, sdsk, fmt, ##a);              \
 176         } while (0)
 177
 178 static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
 179 {
 180         switch (scmd->cmnd[0]) {
 181         case READ_6:
 182         case READ_10:
 183         case READ_12:
 184         case READ_16:
 185         case SYNCHRONIZE_CACHE:
 186         case VERIFY:
 187         case VERIFY_12:
 188         case VERIFY_16:
 189         case WRITE_6:
 190         case WRITE_10:
 191         case WRITE_12:
 192         case WRITE_16:
 193         case WRITE_SAME:
 194         case WRITE_SAME_16:
 195         case UNMAP:
 196                 return 1;
 197         case VARIABLE_LENGTH_CMD:
 198                 switch (scmd->cmnd[9]) {
 199                 case READ_32:
 200                 case VERIFY_32:
 201                 case WRITE_32:
 202                 case WRITE_SAME_32:
 203                         return 1;
 204                 }
 205         }
 206
 207         return 0;
 208 }
 209
 210 static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks)
 211 {
 212         return blocks << (ilog2(sdev->sector_size) - 9);
 213 }
 214
 215 static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks)
 216 {
 217         return blocks * sdev->sector_size;
 218 }
 219
 220 static inline sector_t bytes_to_logical(struct scsi_device *sdev, unsigned int bytes)
 221 {
 222         return bytes >> ilog2(sdev->sector_size);
 223 }
 224
 225 static inline sector_t sectors_to_logical(struct scsi_device *sdev, sector_t sector)
 226 {
 227         return sector >> (ilog2(sdev->sector_size) - 9);
 228 }
 229
 230 #ifdef CONFIG_BLK_DEV_INTEGRITY
 231
 232 extern void sd_dif_config_host(struct scsi_disk *);
 233
 234 #else /* CONFIG_BLK_DEV_INTEGRITY */
 235
 236 static inline void sd_dif_config_host(struct scsi_disk *disk)
 237 {
 238 }
 239
 240 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 241
 242 static inline int sd_is_zoned(struct scsi_disk *sdkp)
 243 {
 244         return sdkp->zoned == 1 || sdkp->device->type == TYPE_ZBC;
 245 }
 246
 247 #ifdef CONFIG_BLK_DEV_ZONED
 248
 249 void sd_zbc_free_zone_info(struct scsi_disk *sdkp);
 250 int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE]);
 251 int sd_zbc_revalidate_zones(struct scsi_disk *sdkp);
 252 blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
 253                                          unsigned char op, bool all);
 254 unsigned int sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
 255                              struct scsi_sense_hdr *sshdr);
 256 int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
 257                 unsigned int nr_zones, report_zones_cb cb, void *data);
 258
 259 blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
 260                                         unsigned int nr_blocks);
 261
 262 #else /* CONFIG_BLK_DEV_ZONED */
 263
 264 static inline void sd_zbc_free_zone_info(struct scsi_disk *sdkp) {}
 265
 266 static inline int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE])
 267 {
 268         return 0;
 269 }
 270
 271 static inline int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
 272 {
 273         return 0;
 274 }
 275
 276 static inline blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
 277                                                        unsigned char op,
 278                                                        bool all)
 279 {
 280         return BLK_STS_TARGET;
 281 }
 282
 283 static inline unsigned int sd_zbc_complete(struct scsi_cmnd *cmd,
 284                         unsigned int good_bytes, struct scsi_sense_hdr *sshdr)
 285 {
 286         return good_bytes;
 287 }
 288
 289 static inline blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd,
 290                                                       sector_t *lba,
 291                                                       unsigned int nr_blocks)
 292 {
 293         return BLK_STS_TARGET;
 294 }
 295
 296 #define sd_zbc_report_zones NULL
 297
 298 #endif /* CONFIG_BLK_DEV_ZONED */
 299
 300 void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr);
 301 void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result);
 302
 303 #endif /* _SCSI_DISK_H */