drivers/scsi/sd.h - fs/xfs/xfs-linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 #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 */
 };

 enum {
 	SD_ZERO_WRITE = 0,	/* Use WRITE(10/16) command */
 	SD_ZERO_WS,		/* Use WRITE SAME(10/16) command */
 	SD_ZERO_WS16_UNMAP,	/* Use WRITE SAME(16) with UNMAP */
 	SD_ZERO_WS10_UNMAP,	/* Use WRITE SAME(10) with UNMAP */
 };

 /**
  * struct zoned_disk_info - Specific properties of a ZBC SCSI device.
  * @nr_zones: number of zones.
  * @zone_blocks: number of logical blocks per zone.
  *
  * This data structure holds the ZBC SCSI device properties that are retrieved
  * twice: a first time before the gendisk capacity is known and a second time
  * after the gendisk capacity is known.
  */
 struct zoned_disk_info {
 	u32		nr_zones;
 	u32		zone_blocks;
 };

 struct scsi_disk {
 	struct scsi_device *device;

 	/*
 	 * disk_dev is used to show attributes in /sys/class/scsi_disk/,
 	 * but otherwise not really needed.  Do not use for refcounting.
 	 */
 	struct device	disk_dev;
 	struct gendisk	*disk;
 	struct opal_dev *opal_dev;
 #ifdef CONFIG_BLK_DEV_ZONED
 	/* Updated during revalidation before the gendisk capacity is known. */
 	struct zoned_disk_info	early_zone_info;
 	/* Updated during revalidation after the gendisk capacity is known. */
 	struct zoned_disk_info	zone_info;
 	u32		zones_optimal_open;
 	u32		zones_optimal_nonseq;
 	u32		zones_max_open;
 	/*
 	 * Either zero or a power of two. If not zero it means that the offset
 	 * between zone starting LBAs is constant.
 	 */
 	u32		zone_starting_lba_gran;
 	u32		*zones_wp_offset;
 	spinlock_t	zones_wp_offset_lock;
 	u32		*rev_wp_offset;
 	struct mutex	rev_mutex;
 	struct work_struct zone_wp_offset_work;
 	char		*zone_wp_update_buf;
 #endif
 	atomic_t	openers;
 	sector_t	capacity;	/* size in logical blocks */
 	int		max_retries;
 	u32		min_xfer_blocks;
 	u32		max_xfer_blocks;
 	u32		opt_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;
 	u8		zeroing_mode;
 	u8		nr_actuators;		/* Number of actuators */
 	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;
 	unsigned	rc_basis: 2;
 	unsigned	zoned: 2;
 	unsigned	urswrz : 1;
 	unsigned	security : 1;
 	unsigned	ignore_medium_access_errors : 1;
 };
 #define to_scsi_disk(obj) container_of(obj, struct scsi_disk, disk_dev)

 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
 {
 	return disk->private_data;
 }

 #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 ((sdsk)->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;
 }

 static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks)
 {
 	return blocks << (ilog2(sdev->sector_size) - 9);
 }

 static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks)
 {
 	return blocks * sdev->sector_size;
 }

 static inline sector_t bytes_to_logical(struct scsi_device *sdev, unsigned int bytes)
 {
 	return bytes >> ilog2(sdev->sector_size);
 }

 static inline sector_t sectors_to_logical(struct scsi_device *sdev, sector_t sector)
 {
 	return sector >> (ilog2(sdev->sector_size) - 9);
 }

 #ifdef CONFIG_BLK_DEV_INTEGRITY

 extern void sd_dif_config_host(struct scsi_disk *);

 #else /* CONFIG_BLK_DEV_INTEGRITY */

 static inline void sd_dif_config_host(struct scsi_disk *disk)
 {
 }

 #endif /* CONFIG_BLK_DEV_INTEGRITY */

 static inline int sd_is_zoned(struct scsi_disk *sdkp)
 {
 	return sdkp->zoned == 1 || sdkp->device->type == TYPE_ZBC;
 }

 #ifdef CONFIG_BLK_DEV_ZONED

 void sd_zbc_free_zone_info(struct scsi_disk *sdkp);
 int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE]);
 int sd_zbc_revalidate_zones(struct scsi_disk *sdkp);
 blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
 					 unsigned char op, bool all);
 unsigned int sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
 			     struct scsi_sense_hdr *sshdr);
 int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
 		unsigned int nr_zones, report_zones_cb cb, void *data);

 blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
 				        unsigned int nr_blocks);

 #else /* CONFIG_BLK_DEV_ZONED */

 static inline void sd_zbc_free_zone_info(struct scsi_disk *sdkp) {}

 static inline int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE])
 {
 	return 0;
 }

 static inline int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
 {
 	return 0;
 }

 static inline blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
 						       unsigned char op,
 						       bool all)
 {
 	return BLK_STS_TARGET;
 }

 static inline unsigned int sd_zbc_complete(struct scsi_cmnd *cmd,
 			unsigned int good_bytes, struct scsi_sense_hdr *sshdr)
 {
 	return good_bytes;
 }

 static inline blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd,
 						      sector_t *lba,
 						      unsigned int nr_blocks)
 {
 	return BLK_STS_TARGET;
 }

 #define sd_zbc_report_zones NULL

 #endif /* CONFIG_BLK_DEV_ZONED */

 void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr);
 void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result);

 #endif /* _SCSI_DISK_H */
	/* SPDX-License-Identifier: GPL-2.0 */
	#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 */
	};

	enum {
	SD_ZERO_WRITE = 0, /* Use WRITE(10/16) command */
	SD_ZERO_WS, /* Use WRITE SAME(10/16) command */
	SD_ZERO_WS16_UNMAP, /* Use WRITE SAME(16) with UNMAP */
	SD_ZERO_WS10_UNMAP, /* Use WRITE SAME(10) with UNMAP */
	};

	/**
	* struct zoned_disk_info - Specific properties of a ZBC SCSI device.
	* @nr_zones: number of zones.
	* @zone_blocks: number of logical blocks per zone.
	*
	* This data structure holds the ZBC SCSI device properties that are retrieved
	* twice: a first time before the gendisk capacity is known and a second time
	* after the gendisk capacity is known.
	*/
	struct zoned_disk_info {
	u32 nr_zones;
	u32 zone_blocks;
	};

	struct scsi_disk {
	struct scsi_device *device;

	/*
	* disk_dev is used to show attributes in /sys/class/scsi_disk/,
	* but otherwise not really needed. Do not use for refcounting.
	*/
	struct device disk_dev;
	struct gendisk *disk;
	struct opal_dev *opal_dev;
	#ifdef CONFIG_BLK_DEV_ZONED
	/* Updated during revalidation before the gendisk capacity is known. */
	struct zoned_disk_info early_zone_info;
	/* Updated during revalidation after the gendisk capacity is known. */
	struct zoned_disk_info zone_info;
	u32 zones_optimal_open;
	u32 zones_optimal_nonseq;
	u32 zones_max_open;
	/*
	* Either zero or a power of two. If not zero it means that the offset
	* between zone starting LBAs is constant.
	*/
	u32 zone_starting_lba_gran;
	u32 *zones_wp_offset;
	spinlock_t zones_wp_offset_lock;
	u32 *rev_wp_offset;
	struct mutex rev_mutex;
	struct work_struct zone_wp_offset_work;
	char *zone_wp_update_buf;
	#endif
	atomic_t openers;
	sector_t capacity; /* size in logical blocks */
	int max_retries;
	u32 min_xfer_blocks;
	u32 max_xfer_blocks;
	u32 opt_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;
	u8 zeroing_mode;
	u8 nr_actuators; /* Number of actuators */
	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;
	unsigned rc_basis: 2;
	unsigned zoned: 2;
	unsigned urswrz : 1;
	unsigned security : 1;
	unsigned ignore_medium_access_errors : 1;
	};
	#define to_scsi_disk(obj) container_of(obj, struct scsi_disk, disk_dev)

	static inline struct scsi_disk scsi_disk(struct gendisk disk)
	{
	return disk->private_data;
	}

	#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 ((sdsk)->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;
	}

	static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks)
	{
	return blocks << (ilog2(sdev->sector_size) - 9);
	}

	static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks)
	{
	return blocks * sdev->sector_size;
	}

	static inline sector_t bytes_to_logical(struct scsi_device *sdev, unsigned int bytes)
	{
	return bytes >> ilog2(sdev->sector_size);
	}

	static inline sector_t sectors_to_logical(struct scsi_device *sdev, sector_t sector)
	{
	return sector >> (ilog2(sdev->sector_size) - 9);
	}

	#ifdef CONFIG_BLK_DEV_INTEGRITY

	extern void sd_dif_config_host(struct scsi_disk *);

	#else /* CONFIG_BLK_DEV_INTEGRITY */

	static inline void sd_dif_config_host(struct scsi_disk *disk)
	{
	}

	#endif /* CONFIG_BLK_DEV_INTEGRITY */

	static inline int sd_is_zoned(struct scsi_disk *sdkp)
	{
	return sdkp->zoned == 1 \|\| sdkp->device->type == TYPE_ZBC;
	}

	#ifdef CONFIG_BLK_DEV_ZONED

	void sd_zbc_free_zone_info(struct scsi_disk *sdkp);
	int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE]);
	int sd_zbc_revalidate_zones(struct scsi_disk *sdkp);
	blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
	unsigned char op, bool all);
	unsigned int sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
	struct scsi_sense_hdr *sshdr);
	int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
	unsigned int nr_zones, report_zones_cb cb, void *data);

	blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd cmd, sector_t lba,
	unsigned int nr_blocks);

	#else /* CONFIG_BLK_DEV_ZONED */

	static inline void sd_zbc_free_zone_info(struct scsi_disk *sdkp) {}

	static inline int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE])
	{
	return 0;
	}

	static inline int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
	{
	return 0;
	}

	static inline blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
	unsigned char op,
	bool all)
	{
	return BLK_STS_TARGET;
	}

	static inline unsigned int sd_zbc_complete(struct scsi_cmnd *cmd,
	unsigned int good_bytes, struct scsi_sense_hdr *sshdr)
	{
	return good_bytes;
	}

	static inline blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd,
	sector_t *lba,
	unsigned int nr_blocks)
	{
	return BLK_STS_TARGET;
	}

	#define sd_zbc_report_zones NULL

	#endif /* CONFIG_BLK_DEV_ZONED */

	void sd_print_sense_hdr(struct scsi_disk sdkp, struct scsi_sense_hdr sshdr);
	void sd_print_result(const struct scsi_disk sdkp, const char msg, int result);

	#endif /* _SCSI_DISK_H */