[mirror_ubuntu-bionic-kernel.git] / drivers / scsi / sd.h

#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)
#define SD_FLUSH_TIMEOUT	(60 * HZ)
#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_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_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_printk(prefix, (sdsk)->device, "[%s] " fmt,		\
		    (sdsk)->disk->disk_name, ##a) :			\
	sdev_printk(prefix, (sdsk)->device, fmt, ##a)

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,
};

/*
 * 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 request *rq, sector_t, unsigned int);
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 request *rq, sector_t s, unsigned int a)
{
	return 0;
}
static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
{
}

#endif /* CONFIG_BLK_DEV_INTEGRITY */

#endif /* _SCSI_DISK_H */
Commit	Line	Data
e73aec82 MP	1	#ifndef _SCSI_DISK_H
	2	#define _SCSI_DISK_H
	3
	4	/*
	5	* More than enough for everybody ;) The huge number of majors
	6	* is a leftover from 16bit dev_t days, we don't really need that
	7	* much numberspace.
	8	*/
	9	#define SD_MAJORS 16
	10
e73aec82 MP	11	/*
	12	* Time out in seconds for disks and Magneto-opticals (which are slower).
	13	*/
	14	#define SD_TIMEOUT (30 * HZ)
	15	#define SD_MOD_TIMEOUT (75 * HZ)
e3b3e624	16	#define SD_FLUSH_TIMEOUT (60 * HZ)
5db44863	17	#define SD_WRITE_SAME_TIMEOUT (120 * HZ)
e73aec82 MP	18
	19	/*
	20	* Number of allowed retries
	21	*/
	22	#define SD_MAX_RETRIES 5
	23	#define SD_PASSTHROUGH_RETRIES 1
18a4d0a2	24	#define SD_MAX_MEDIUM_TIMEOUTS 2
e73aec82 MP	25
	26	/*
	27	* Size of the initial data buffer for mode and read capacity data
	28	*/
	29	#define SD_BUF_SIZE 512
	30
18351070 LT	31	/*
	32	* Number of sectors at the end of the device to avoid multi-sector
	33	* accesses to in the case of last_sector_bug
	34	*/
	35	#define SD_LAST_BUGGY_SECTORS 8
	36
4e7392ec MP	37	enum {
	38	SD_EXT_CDB_SIZE = 32, /* Extended CDB size */
	39	SD_MEMPOOL_SIZE = 2, /* CDB pool size */
	40	};
	41
5db44863 MP	42	enum {
	43	SD_MAX_WS10_BLOCKS = 0xffff,
	44	SD_MAX_WS16_BLOCKS = 0x7fffff,
	45	};
	46
c98a0eb0 MP	47	enum {
	48	SD_LBP_FULL = 0, /* Full logical block provisioning */
	49	SD_LBP_UNMAP, /* Use UNMAP command */
	50	SD_LBP_WS16, /* Use WRITE SAME(16) with UNMAP bit */
	51	SD_LBP_WS10, /* Use WRITE SAME(10) with UNMAP bit */
	52	SD_LBP_ZERO, /* Use WRITE SAME(10) with zero payload */
	53	SD_LBP_DISABLE, /* Discard disabled due to failed cmd */
	54	};
	55
e73aec82 MP	56	struct scsi_disk {
	57	struct scsi_driver driver; / always &sd_template */
	58	struct scsi_device *device;
ee959b00	59	struct device dev;
e73aec82	60	struct gendisk *disk;
409f3499	61	atomic_t openers;
e73aec82	62	sector_t capacity; /* size in 512-byte sectors */
c98a0eb0 MP	63	u32 max_ws_blocks;
	64	u32 max_unmap_blocks;
	65	u32 unmap_granularity;
	66	u32 unmap_alignment;
e73aec82	67	u32 index;
526f7c79	68	unsigned int physical_block_size;
18a4d0a2 MP	69	unsigned int max_medium_access_timeouts;
18a4d0a2 MP	70	unsigned int medium_access_timed_out;
e73aec82 MP	71	u8 media_present;
e73aec82 MP	72	u8 write_prot;
e0597d70	73	u8 protection_type;/* Data Integrity Field */
c98a0eb0	74	u8 provisioning_mode;
e0597d70	75	unsigned ATO : 1; /* state of disk ATO bit */
39c60a09	76	unsigned cache_override : 1; /* temp override of WCE,RCD */
e73aec82 MP	77	unsigned WCE : 1; /* state of disk WCE bit */
	78	unsigned RCD : 1; /* state of disk RCD bit, unused */
	79	unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
70a9b873	80	unsigned first_scan : 1;
c98a0eb0 MP	81	unsigned lbpme : 1;
	82	unsigned lbprz : 1;
	83	unsigned lbpu : 1;
	84	unsigned lbpws : 1;
	85	unsigned lbpws10 : 1;
	86	unsigned lbpvpd : 1;
66c28f97	87	unsigned ws10 : 1;
5db44863	88	unsigned ws16 : 1;
e73aec82	89	};
ee959b00	90	#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
e73aec82	91
5b635da1 MP	92	static inline struct scsi_disk scsi_disk(struct gendisk disk)
	93	{
	94	return container_of(disk->private_data, struct scsi_disk, driver);
	95	}
	96
e73aec82 MP	97	#define sd_printk(prefix, sdsk, fmt, a...) \
	98	(sdsk)->disk ? \
	99	sdev_printk(prefix, (sdsk)->device, "[%s] " fmt, \
	100	(sdsk)->disk->disk_name, ##a) : \
	101	sdev_printk(prefix, (sdsk)->device, fmt, ##a)
	102
18a4d0a2 MP	103	static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
	104	{
	105	switch (scmd->cmnd[0]) {
	106	case READ_6:
	107	case READ_10:
	108	case READ_12:
	109	case READ_16:
	110	case SYNCHRONIZE_CACHE:
	111	case VERIFY:
	112	case VERIFY_12:
	113	case VERIFY_16:
	114	case WRITE_6:
	115	case WRITE_10:
	116	case WRITE_12:
	117	case WRITE_16:
	118	case WRITE_SAME:
	119	case WRITE_SAME_16:
	120	case UNMAP:
	121	return 1;
	122	case VARIABLE_LENGTH_CMD:
	123	switch (scmd->cmnd[9]) {
	124	case READ_32:
	125	case VERIFY_32:
	126	case WRITE_32:
	127	case WRITE_SAME_32:
	128	return 1;
	129	}
	130	}
	131
	132	return 0;
	133	}
	134
e0597d70 MP	135	/*
	136	* A DIF-capable target device can be formatted with different
	137	* protection schemes. Currently 0 through 3 are defined:
	138	*
	139	* Type 0 is regular (unprotected) I/O
	140	*
	141	* Type 1 defines the contents of the guard and reference tags
	142	*
	143	* Type 2 defines the contents of the guard and reference tags and
	144	* uses 32-byte commands to seed the latter
	145	*
	146	* Type 3 defines the contents of the guard tag only
	147	*/
	148
	149	enum sd_dif_target_protection_types {
	150	SD_DIF_TYPE0_PROTECTION = 0x0,
	151	SD_DIF_TYPE1_PROTECTION = 0x1,
	152	SD_DIF_TYPE2_PROTECTION = 0x2,
	153	SD_DIF_TYPE3_PROTECTION = 0x3,
	154	};
	155
af55ff67 MP	156	/*
	157	* Data Integrity Field tuple.
	158	*/
	159	struct sd_dif_tuple {
	160	__be16 guard_tag; /* Checksum */
	161	__be16 app_tag; /* Opaque storage */
	162	__be32 ref_tag; /* Target LBA or indirect LBA */
	163	};
	164
4c393e6e	165	#ifdef CONFIG_BLK_DEV_INTEGRITY
af55ff67	166
af55ff67	167	extern void sd_dif_config_host(struct scsi_disk *);
8c579ab6	168	extern void sd_dif_prepare(struct request *rq, sector_t, unsigned int);
af55ff67 MP	169	extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
	170
	171	#else /* CONFIG_BLK_DEV_INTEGRITY */
	172
4c393e6e JB	173	static inline void sd_dif_config_host(struct scsi_disk *disk)
	174	{
	175	}
	176	static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
	177	{
	178	return 0;
	179	}
	180	static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
	181	{
	182	}
af55ff67 MP	183
	184	#endif /* CONFIG_BLK_DEV_INTEGRITY */
	185
e73aec82	186	#endif /* _SCSI_DISK_H */