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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 | #define SD_FLUSH_TIMEOUT (60 * HZ) | |
17 | #define SD_WRITE_SAME_TIMEOUT (120 * HZ) | |
18 | ||
19 | /* | |
20 | * Number of allowed retries | |
21 | */ | |
22 | #define SD_MAX_RETRIES 5 | |
23 | #define SD_PASSTHROUGH_RETRIES 1 | |
24 | #define SD_MAX_MEDIUM_TIMEOUTS 2 | |
25 | ||
26 | /* | |
27 | * Size of the initial data buffer for mode and read capacity data | |
28 | */ | |
29 | #define SD_BUF_SIZE 512 | |
30 | ||
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 | ||
37 | enum { | |
38 | SD_EXT_CDB_SIZE = 32, /* Extended CDB size */ | |
39 | SD_MEMPOOL_SIZE = 2, /* CDB pool size */ | |
40 | }; | |
41 | ||
42 | enum { | |
43 | SD_MAX_WS10_BLOCKS = 0xffff, | |
44 | SD_MAX_WS16_BLOCKS = 0x7fffff, | |
45 | }; | |
46 | ||
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 | ||
56 | struct scsi_disk { | |
57 | struct scsi_driver *driver; /* always &sd_template */ | |
58 | struct scsi_device *device; | |
59 | struct device dev; | |
60 | struct gendisk *disk; | |
61 | atomic_t openers; | |
62 | sector_t capacity; /* size in 512-byte sectors */ | |
63 | u32 max_ws_blocks; | |
64 | u32 max_unmap_blocks; | |
65 | u32 unmap_granularity; | |
66 | u32 unmap_alignment; | |
67 | u32 index; | |
68 | unsigned int physical_block_size; | |
69 | unsigned int max_medium_access_timeouts; | |
70 | unsigned int medium_access_timed_out; | |
71 | u8 media_present; | |
72 | u8 write_prot; | |
73 | u8 protection_type;/* Data Integrity Field */ | |
74 | u8 provisioning_mode; | |
75 | unsigned ATO : 1; /* state of disk ATO bit */ | |
76 | unsigned cache_override : 1; /* temp override of WCE,RCD */ | |
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 */ | |
80 | unsigned first_scan : 1; | |
81 | unsigned lbpme : 1; | |
82 | unsigned lbprz : 1; | |
83 | unsigned lbpu : 1; | |
84 | unsigned lbpws : 1; | |
85 | unsigned lbpws10 : 1; | |
86 | unsigned lbpvpd : 1; | |
87 | unsigned ws10 : 1; | |
88 | unsigned ws16 : 1; | |
89 | }; | |
90 | #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev) | |
91 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
165 | #ifdef CONFIG_BLK_DEV_INTEGRITY | |
166 | ||
167 | extern void sd_dif_config_host(struct scsi_disk *); | |
168 | extern void sd_dif_prepare(struct request *rq, sector_t, unsigned int); | |
169 | extern void sd_dif_complete(struct scsi_cmnd *, unsigned int); | |
170 | ||
171 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
172 | ||
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 | } | |
183 | ||
184 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
185 | ||
186 | #endif /* _SCSI_DISK_H */ |