summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/sd.h
blob: 61d02efd366c362bee8c6cc49df77bcba67357b7 (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
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
#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 scsi_disk {
	struct scsi_driver *driver;	/* always &sd_template */
	struct scsi_device *device;
	struct device	dev;
	struct gendisk	*disk;
#ifdef CONFIG_BLK_DEV_ZONED
	unsigned int	nr_zones;
	unsigned int	zone_blocks;
	unsigned int	zone_shift;
	unsigned long	*zones_wlock;
	unsigned int	zones_optimal_open;
	unsigned int	zones_optimal_nonseq;
	unsigned int	zones_max_open;
#endif
	atomic_t	openers;
	sector_t	capacity;	/* size in logical 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;
	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	ignore_medium_access_errors : 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;
}

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);
}

/*
 * 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];
}

#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 */

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

#ifdef CONFIG_BLK_DEV_ZONED

extern int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buffer);
extern void sd_zbc_remove(struct scsi_disk *sdkp);
extern void sd_zbc_print_zones(struct scsi_disk *sdkp);
extern int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd);
extern void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd);
extern int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd);
extern int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd);
extern void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
			    struct scsi_sense_hdr *sshdr);

#else /* CONFIG_BLK_DEV_ZONED */

static inline int sd_zbc_read_zones(struct scsi_disk *sdkp,
				    unsigned char *buf)
{
	return 0;
}

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

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

static inline int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd)
{
	/* Let the drive fail requests */
	return BLKPREP_OK;
}

static inline void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd) {}

static inline int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
{
	return BLKPREP_INVALID;
}

static inline int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
{
	return BLKPREP_INVALID;
}

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

#endif /* CONFIG_BLK_DEV_ZONED */

#endif /* _SCSI_DISK_H */
OpenPOWER on IntegriCloud