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-rw-r--r--kernel/drivers/scsi/sd.h261
1 files changed, 261 insertions, 0 deletions
diff --git a/kernel/drivers/scsi/sd.h b/kernel/drivers/scsi/sd.h
new file mode 100644
index 000000000..63ba5ca7f
--- /dev/null
+++ b/kernel/drivers/scsi/sd.h
@@ -0,0 +1,261 @@
+#ifndef _SCSI_DISK_H
+#define _SCSI_DISK_H
+
+/*
+ * More than enough for everybody ;) The huge number of majors
+ * is a leftover from 16bit dev_t days, we don't really need that
+ * much numberspace.
+ */
+#define SD_MAJORS 16
+
+/*
+ * Time out in seconds for disks and Magneto-opticals (which are slower).
+ */
+#define SD_TIMEOUT (30 * HZ)
+#define SD_MOD_TIMEOUT (75 * HZ)
+/*
+ * Flush timeout is a multiplier over the standard device timeout which is
+ * user modifiable via sysfs but initially set to SD_TIMEOUT
+ */
+#define SD_FLUSH_TIMEOUT_MULTIPLIER 2
+#define SD_WRITE_SAME_TIMEOUT (120 * HZ)
+
+/*
+ * Number of allowed retries
+ */
+#define SD_MAX_RETRIES 5
+#define SD_PASSTHROUGH_RETRIES 1
+#define SD_MAX_MEDIUM_TIMEOUTS 2
+
+/*
+ * Size of the initial data buffer for mode and read capacity data
+ */
+#define SD_BUF_SIZE 512
+
+/*
+ * Number of sectors at the end of the device to avoid multi-sector
+ * accesses to in the case of last_sector_bug
+ */
+#define SD_LAST_BUGGY_SECTORS 8
+
+enum {
+ SD_EXT_CDB_SIZE = 32, /* Extended CDB size */
+ SD_MEMPOOL_SIZE = 2, /* CDB pool size */
+};
+
+enum {
+ SD_DEF_XFER_BLOCKS = 0xffff,
+ SD_MAX_XFER_BLOCKS = 0xffffffff,
+ SD_MAX_WS10_BLOCKS = 0xffff,
+ SD_MAX_WS16_BLOCKS = 0x7fffff,
+};
+
+enum {
+ SD_LBP_FULL = 0, /* Full logical block provisioning */
+ SD_LBP_UNMAP, /* Use UNMAP command */
+ SD_LBP_WS16, /* Use WRITE SAME(16) with UNMAP bit */
+ SD_LBP_WS10, /* Use WRITE SAME(10) with UNMAP bit */
+ SD_LBP_ZERO, /* Use WRITE SAME(10) with zero payload */
+ SD_LBP_DISABLE, /* Discard disabled due to failed cmd */
+};
+
+struct scsi_disk {
+ struct scsi_driver *driver; /* always &sd_template */
+ struct scsi_device *device;
+ struct device dev;
+ struct gendisk *disk;
+ atomic_t openers;
+ sector_t capacity; /* size in 512-byte sectors */
+ u32 max_xfer_blocks;
+ u32 max_ws_blocks;
+ u32 max_unmap_blocks;
+ u32 unmap_granularity;
+ u32 unmap_alignment;
+ u32 index;
+ unsigned int physical_block_size;
+ unsigned int max_medium_access_timeouts;
+ unsigned int medium_access_timed_out;
+ u8 media_present;
+ u8 write_prot;
+ u8 protection_type;/* Data Integrity Field */
+ u8 provisioning_mode;
+ unsigned ATO : 1; /* state of disk ATO bit */
+ unsigned cache_override : 1; /* temp override of WCE,RCD */
+ unsigned WCE : 1; /* state of disk WCE bit */
+ unsigned RCD : 1; /* state of disk RCD bit, unused */
+ unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
+ unsigned first_scan : 1;
+ unsigned lbpme : 1;
+ unsigned lbprz : 1;
+ unsigned lbpu : 1;
+ unsigned lbpws : 1;
+ unsigned lbpws10 : 1;
+ unsigned lbpvpd : 1;
+ unsigned ws10 : 1;
+ unsigned ws16 : 1;
+};
+#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
+
+static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
+{
+ return container_of(disk->private_data, struct scsi_disk, driver);
+}
+
+#define sd_printk(prefix, sdsk, fmt, a...) \
+ (sdsk)->disk ? \
+ sdev_prefix_printk(prefix, (sdsk)->device, \
+ (sdsk)->disk->disk_name, fmt, ##a) : \
+ sdev_printk(prefix, (sdsk)->device, fmt, ##a)
+
+#define sd_first_printk(prefix, sdsk, fmt, a...) \
+ do { \
+ if ((sdkp)->first_scan) \
+ sd_printk(prefix, sdsk, fmt, ##a); \
+ } while (0)
+
+static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
+{
+ switch (scmd->cmnd[0]) {
+ case READ_6:
+ case READ_10:
+ case READ_12:
+ case READ_16:
+ case SYNCHRONIZE_CACHE:
+ case VERIFY:
+ case VERIFY_12:
+ case VERIFY_16:
+ case WRITE_6:
+ case WRITE_10:
+ case WRITE_12:
+ case WRITE_16:
+ case WRITE_SAME:
+ case WRITE_SAME_16:
+ case UNMAP:
+ return 1;
+ case VARIABLE_LENGTH_CMD:
+ switch (scmd->cmnd[9]) {
+ case READ_32:
+ case VERIFY_32:
+ case WRITE_32:
+ case WRITE_SAME_32:
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * A DIF-capable target device can be formatted with different
+ * protection schemes. Currently 0 through 3 are defined:
+ *
+ * Type 0 is regular (unprotected) I/O
+ *
+ * Type 1 defines the contents of the guard and reference tags
+ *
+ * Type 2 defines the contents of the guard and reference tags and
+ * uses 32-byte commands to seed the latter
+ *
+ * Type 3 defines the contents of the guard tag only
+ */
+
+enum sd_dif_target_protection_types {
+ SD_DIF_TYPE0_PROTECTION = 0x0,
+ SD_DIF_TYPE1_PROTECTION = 0x1,
+ SD_DIF_TYPE2_PROTECTION = 0x2,
+ SD_DIF_TYPE3_PROTECTION = 0x3,
+};
+
+/*
+ * Look up the DIX operation based on whether the command is read or
+ * write and whether dix and dif are enabled.
+ */
+static inline unsigned int sd_prot_op(bool write, bool dix, bool dif)
+{
+ /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
+ const unsigned int ops[] = { /* wrt dix dif */
+ SCSI_PROT_NORMAL, /* 0 0 0 */
+ SCSI_PROT_READ_STRIP, /* 0 0 1 */
+ SCSI_PROT_READ_INSERT, /* 0 1 0 */
+ SCSI_PROT_READ_PASS, /* 0 1 1 */
+ SCSI_PROT_NORMAL, /* 1 0 0 */
+ SCSI_PROT_WRITE_INSERT, /* 1 0 1 */
+ SCSI_PROT_WRITE_STRIP, /* 1 1 0 */
+ SCSI_PROT_WRITE_PASS, /* 1 1 1 */
+ };
+
+ return ops[write << 2 | dix << 1 | dif];
+}
+
+/*
+ * Returns a mask of the protection flags that are valid for a given DIX
+ * operation.
+ */
+static inline unsigned int sd_prot_flag_mask(unsigned int prot_op)
+{
+ const unsigned int flag_mask[] = {
+ [SCSI_PROT_NORMAL] = 0,
+
+ [SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI |
+ SCSI_PROT_GUARD_CHECK |
+ SCSI_PROT_REF_CHECK |
+ SCSI_PROT_REF_INCREMENT,
+
+ [SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT |
+ SCSI_PROT_IP_CHECKSUM,
+
+ [SCSI_PROT_READ_PASS] = SCSI_PROT_TRANSFER_PI |
+ SCSI_PROT_GUARD_CHECK |
+ SCSI_PROT_REF_CHECK |
+ SCSI_PROT_REF_INCREMENT |
+ SCSI_PROT_IP_CHECKSUM,
+
+ [SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI |
+ SCSI_PROT_REF_INCREMENT,
+
+ [SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK |
+ SCSI_PROT_REF_CHECK |
+ SCSI_PROT_REF_INCREMENT |
+ SCSI_PROT_IP_CHECKSUM,
+
+ [SCSI_PROT_WRITE_PASS] = SCSI_PROT_TRANSFER_PI |
+ SCSI_PROT_GUARD_CHECK |
+ SCSI_PROT_REF_CHECK |
+ SCSI_PROT_REF_INCREMENT |
+ SCSI_PROT_IP_CHECKSUM,
+ };
+
+ return flag_mask[prot_op];
+}
+
+/*
+ * Data Integrity Field tuple.
+ */
+struct sd_dif_tuple {
+ __be16 guard_tag; /* Checksum */
+ __be16 app_tag; /* Opaque storage */
+ __be32 ref_tag; /* Target LBA or indirect LBA */
+};
+
+#ifdef CONFIG_BLK_DEV_INTEGRITY
+
+extern void sd_dif_config_host(struct scsi_disk *);
+extern void sd_dif_prepare(struct scsi_cmnd *scmd);
+extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
+
+#else /* CONFIG_BLK_DEV_INTEGRITY */
+
+static inline void sd_dif_config_host(struct scsi_disk *disk)
+{
+}
+static inline int sd_dif_prepare(struct scsi_cmnd *scmd)
+{
+ return 0;
+}
+static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
+{
+}
+
+#endif /* CONFIG_BLK_DEV_INTEGRITY */
+
+#endif /* _SCSI_DISK_H */