summaryrefslogtreecommitdiff
path: root/drivers/scsi/sd.h
blob: 36382eca941ce2365654ecde28995379676f6f3c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
/* 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;
#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		max_atomic;
	u32		atomic_alignment;
	u32		atomic_granularity;
	u32		max_atomic_with_boundary;
	u32		max_atomic_boundary;

	u32		index;
	unsigned int	physical_block_size;
	unsigned int	max_medium_access_timeouts;
	unsigned int	medium_access_timed_out;
			/* number of permanent streams */
	u16		permanent_stream_count;
	u8		media_present;
	u8		write_prot;
	u8		protection_type;/* Data Integrity Field */
	u8		provisioning_mode;
	u8		zeroing_mode;
	u8		nr_actuators;		/* Number of actuators */
	bool		suspended;	/* Disk is suspended (stopped) */
	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;
	unsigned	rscs : 1; /* reduced stream control support */
	unsigned	use_atomic_write_boundary : 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);
}

void sd_dif_config_host(struct scsi_disk *sdkp, struct queue_limits *lim);

#ifdef CONFIG_BLK_DEV_ZONED

int sd_zbc_read_zones(struct scsi_disk *sdkp, struct queue_limits *lim,
		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);

#else /* CONFIG_BLK_DEV_ZONED */

static inline int sd_zbc_read_zones(struct scsi_disk *sdkp,
		struct queue_limits *lim, 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;
}

#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 */