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 #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
 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
 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
 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
 216 static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks)
 217 {
 218         return blocks * sdev->sector_size;
 219 }
 220
 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
 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
 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
 253 static inline int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
 254 {
 255         return 0;
 256 }
 257
 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
 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 */