xref: /linux/drivers/scsi/sd.h (revision 1c2dd16add7ebd7fc6a47f21a42f502cfed5ec2f)
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 
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)
16 /*
17  * Flush timeout is a multiplier over the standard device timeout which is
18  * user modifiable via sysfs but initially set to SD_TIMEOUT
19  */
20 #define SD_FLUSH_TIMEOUT_MULTIPLIER	2
21 #define SD_WRITE_SAME_TIMEOUT	(120 * HZ)
22 
23 /*
24  * Number of allowed retries
25  */
26 #define SD_MAX_RETRIES		5
27 #define SD_PASSTHROUGH_RETRIES	1
28 #define SD_MAX_MEDIUM_TIMEOUTS	2
29 
30 /*
31  * Size of the initial data buffer for mode and read capacity data
32  */
33 #define SD_BUF_SIZE		512
34 
35 /*
36  * Number of sectors at the end of the device to avoid multi-sector
37  * accesses to in the case of last_sector_bug
38  */
39 #define SD_LAST_BUGGY_SECTORS	8
40 
41 enum {
42 	SD_EXT_CDB_SIZE = 32,	/* Extended CDB size */
43 	SD_MEMPOOL_SIZE = 2,	/* CDB pool size */
44 };
45 
46 enum {
47 	SD_DEF_XFER_BLOCKS = 0xffff,
48 	SD_MAX_XFER_BLOCKS = 0xffffffff,
49 	SD_MAX_WS10_BLOCKS = 0xffff,
50 	SD_MAX_WS16_BLOCKS = 0x7fffff,
51 };
52 
53 enum {
54 	SD_LBP_FULL = 0,	/* Full logical block provisioning */
55 	SD_LBP_UNMAP,		/* Use UNMAP command */
56 	SD_LBP_WS16,		/* Use WRITE SAME(16) with UNMAP bit */
57 	SD_LBP_WS10,		/* Use WRITE SAME(10) with UNMAP bit */
58 	SD_LBP_ZERO,		/* Use WRITE SAME(10) with zero payload */
59 	SD_LBP_DISABLE,		/* Discard disabled due to failed cmd */
60 };
61 
62 enum {
63 	SD_ZERO_WRITE = 0,	/* Use WRITE(10/16) command */
64 	SD_ZERO_WS,		/* Use WRITE SAME(10/16) command */
65 	SD_ZERO_WS16_UNMAP,	/* Use WRITE SAME(16) with UNMAP */
66 	SD_ZERO_WS10_UNMAP,	/* Use WRITE SAME(10) with UNMAP */
67 };
68 
69 struct scsi_disk {
70 	struct scsi_driver *driver;	/* always &sd_template */
71 	struct scsi_device *device;
72 	struct device	dev;
73 	struct gendisk	*disk;
74 #ifdef CONFIG_BLK_DEV_ZONED
75 	unsigned int	nr_zones;
76 	unsigned int	zone_blocks;
77 	unsigned int	zone_shift;
78 	unsigned long	*zones_wlock;
79 	unsigned int	zones_optimal_open;
80 	unsigned int	zones_optimal_nonseq;
81 	unsigned int	zones_max_open;
82 #endif
83 	atomic_t	openers;
84 	sector_t	capacity;	/* size in logical blocks */
85 	u32		max_xfer_blocks;
86 	u32		opt_xfer_blocks;
87 	u32		max_ws_blocks;
88 	u32		max_unmap_blocks;
89 	u32		unmap_granularity;
90 	u32		unmap_alignment;
91 	u32		index;
92 	unsigned int	physical_block_size;
93 	unsigned int	max_medium_access_timeouts;
94 	unsigned int	medium_access_timed_out;
95 	u8		media_present;
96 	u8		write_prot;
97 	u8		protection_type;/* Data Integrity Field */
98 	u8		provisioning_mode;
99 	u8		zeroing_mode;
100 	unsigned	ATO : 1;	/* state of disk ATO bit */
101 	unsigned	cache_override : 1; /* temp override of WCE,RCD */
102 	unsigned	WCE : 1;	/* state of disk WCE bit */
103 	unsigned	RCD : 1;	/* state of disk RCD bit, unused */
104 	unsigned	DPOFUA : 1;	/* state of disk DPOFUA bit */
105 	unsigned	first_scan : 1;
106 	unsigned	lbpme : 1;
107 	unsigned	lbprz : 1;
108 	unsigned	lbpu : 1;
109 	unsigned	lbpws : 1;
110 	unsigned	lbpws10 : 1;
111 	unsigned	lbpvpd : 1;
112 	unsigned	ws10 : 1;
113 	unsigned	ws16 : 1;
114 	unsigned	rc_basis: 2;
115 	unsigned	zoned: 2;
116 	unsigned	urswrz : 1;
117 };
118 #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
119 
120 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
121 {
122 	return container_of(disk->private_data, struct scsi_disk, driver);
123 }
124 
125 #define sd_printk(prefix, sdsk, fmt, a...)				\
126         (sdsk)->disk ?							\
127 	      sdev_prefix_printk(prefix, (sdsk)->device,		\
128 				 (sdsk)->disk->disk_name, fmt, ##a) :	\
129 	      sdev_printk(prefix, (sdsk)->device, fmt, ##a)
130 
131 #define sd_first_printk(prefix, sdsk, fmt, a...)			\
132 	do {								\
133 		if ((sdkp)->first_scan)					\
134 			sd_printk(prefix, sdsk, fmt, ##a);		\
135 	} while (0)
136 
137 static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
138 {
139 	switch (scmd->cmnd[0]) {
140 	case READ_6:
141 	case READ_10:
142 	case READ_12:
143 	case READ_16:
144 	case SYNCHRONIZE_CACHE:
145 	case VERIFY:
146 	case VERIFY_12:
147 	case VERIFY_16:
148 	case WRITE_6:
149 	case WRITE_10:
150 	case WRITE_12:
151 	case WRITE_16:
152 	case WRITE_SAME:
153 	case WRITE_SAME_16:
154 	case UNMAP:
155 		return 1;
156 	case VARIABLE_LENGTH_CMD:
157 		switch (scmd->cmnd[9]) {
158 		case READ_32:
159 		case VERIFY_32:
160 		case WRITE_32:
161 		case WRITE_SAME_32:
162 			return 1;
163 		}
164 	}
165 
166 	return 0;
167 }
168 
169 static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blocks)
170 {
171 	return blocks << (ilog2(sdev->sector_size) - 9);
172 }
173 
174 static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks)
175 {
176 	return blocks * sdev->sector_size;
177 }
178 
179 static inline sector_t sectors_to_logical(struct scsi_device *sdev, sector_t sector)
180 {
181 	return sector >> (ilog2(sdev->sector_size) - 9);
182 }
183 
184 /*
185  * Look up the DIX operation based on whether the command is read or
186  * write and whether dix and dif are enabled.
187  */
188 static inline unsigned int sd_prot_op(bool write, bool dix, bool dif)
189 {
190 	/* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
191 	const unsigned int ops[] = {	/* wrt dix dif */
192 		SCSI_PROT_NORMAL,	/*  0	0   0  */
193 		SCSI_PROT_READ_STRIP,	/*  0	0   1  */
194 		SCSI_PROT_READ_INSERT,	/*  0	1   0  */
195 		SCSI_PROT_READ_PASS,	/*  0	1   1  */
196 		SCSI_PROT_NORMAL,	/*  1	0   0  */
197 		SCSI_PROT_WRITE_INSERT, /*  1	0   1  */
198 		SCSI_PROT_WRITE_STRIP,	/*  1	1   0  */
199 		SCSI_PROT_WRITE_PASS,	/*  1	1   1  */
200 	};
201 
202 	return ops[write << 2 | dix << 1 | dif];
203 }
204 
205 /*
206  * Returns a mask of the protection flags that are valid for a given DIX
207  * operation.
208  */
209 static inline unsigned int sd_prot_flag_mask(unsigned int prot_op)
210 {
211 	const unsigned int flag_mask[] = {
212 		[SCSI_PROT_NORMAL]		= 0,
213 
214 		[SCSI_PROT_READ_STRIP]		= SCSI_PROT_TRANSFER_PI |
215 						  SCSI_PROT_GUARD_CHECK |
216 						  SCSI_PROT_REF_CHECK |
217 						  SCSI_PROT_REF_INCREMENT,
218 
219 		[SCSI_PROT_READ_INSERT]		= SCSI_PROT_REF_INCREMENT |
220 						  SCSI_PROT_IP_CHECKSUM,
221 
222 		[SCSI_PROT_READ_PASS]		= SCSI_PROT_TRANSFER_PI |
223 						  SCSI_PROT_GUARD_CHECK |
224 						  SCSI_PROT_REF_CHECK |
225 						  SCSI_PROT_REF_INCREMENT |
226 						  SCSI_PROT_IP_CHECKSUM,
227 
228 		[SCSI_PROT_WRITE_INSERT]	= SCSI_PROT_TRANSFER_PI |
229 						  SCSI_PROT_REF_INCREMENT,
230 
231 		[SCSI_PROT_WRITE_STRIP]		= SCSI_PROT_GUARD_CHECK |
232 						  SCSI_PROT_REF_CHECK |
233 						  SCSI_PROT_REF_INCREMENT |
234 						  SCSI_PROT_IP_CHECKSUM,
235 
236 		[SCSI_PROT_WRITE_PASS]		= SCSI_PROT_TRANSFER_PI |
237 						  SCSI_PROT_GUARD_CHECK |
238 						  SCSI_PROT_REF_CHECK |
239 						  SCSI_PROT_REF_INCREMENT |
240 						  SCSI_PROT_IP_CHECKSUM,
241 	};
242 
243 	return flag_mask[prot_op];
244 }
245 
246 #ifdef CONFIG_BLK_DEV_INTEGRITY
247 
248 extern void sd_dif_config_host(struct scsi_disk *);
249 extern void sd_dif_prepare(struct scsi_cmnd *scmd);
250 extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
251 
252 #else /* CONFIG_BLK_DEV_INTEGRITY */
253 
254 static inline void sd_dif_config_host(struct scsi_disk *disk)
255 {
256 }
257 static inline int sd_dif_prepare(struct scsi_cmnd *scmd)
258 {
259 	return 0;
260 }
261 static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
262 {
263 }
264 
265 #endif /* CONFIG_BLK_DEV_INTEGRITY */
266 
267 static inline int sd_is_zoned(struct scsi_disk *sdkp)
268 {
269 	return sdkp->zoned == 1 || sdkp->device->type == TYPE_ZBC;
270 }
271 
272 #ifdef CONFIG_BLK_DEV_ZONED
273 
274 extern int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buffer);
275 extern void sd_zbc_remove(struct scsi_disk *sdkp);
276 extern void sd_zbc_print_zones(struct scsi_disk *sdkp);
277 extern int sd_zbc_setup_write_cmnd(struct scsi_cmnd *cmd);
278 extern void sd_zbc_cancel_write_cmnd(struct scsi_cmnd *cmd);
279 extern int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd);
280 extern int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd);
281 extern void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
282 			    struct scsi_sense_hdr *sshdr);
283 
284 #else /* CONFIG_BLK_DEV_ZONED */
285 
286 static inline int sd_zbc_read_zones(struct scsi_disk *sdkp,
287 				    unsigned char *buf)
288 {
289 	return 0;
290 }
291 
292 static inline void sd_zbc_remove(struct scsi_disk *sdkp) {}
293 
294 static inline void sd_zbc_print_zones(struct scsi_disk *sdkp) {}
295 
296 static inline int sd_zbc_setup_write_cmnd(struct scsi_cmnd *cmd)
297 {
298 	/* Let the drive fail requests */
299 	return BLKPREP_OK;
300 }
301 
302 static inline void sd_zbc_cancel_write_cmnd(struct scsi_cmnd *cmd) {}
303 
304 static inline int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
305 {
306 	return BLKPREP_INVALID;
307 }
308 
309 static inline int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
310 {
311 	return BLKPREP_INVALID;
312 }
313 
314 static inline void sd_zbc_complete(struct scsi_cmnd *cmd,
315 				   unsigned int good_bytes,
316 				   struct scsi_sense_hdr *sshdr) {}
317 
318 #endif /* CONFIG_BLK_DEV_ZONED */
319 
320 #endif /* _SCSI_DISK_H */
321