Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * sd.c Copyright (C) 1992 Drew Eckhardt |
| 3 | * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale |
| 4 | * |
| 5 | * Linux scsi disk driver |
| 6 | * Initial versions: Drew Eckhardt |
| 7 | * Subsequent revisions: Eric Youngdale |
| 8 | * Modification history: |
| 9 | * - Drew Eckhardt <drew@colorado.edu> original |
| 10 | * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple |
| 11 | * outstanding request, and other enhancements. |
| 12 | * Support loadable low-level scsi drivers. |
| 13 | * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using |
| 14 | * eight major numbers. |
| 15 | * - Richard Gooch <rgooch@atnf.csiro.au> support devfs. |
| 16 | * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in |
| 17 | * sd_init and cleanups. |
| 18 | * - Alex Davis <letmein@erols.com> Fix problem where partition info |
| 19 | * not being read in sd_open. Fix problem where removable media |
| 20 | * could be ejected after sd_open. |
| 21 | * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x |
| 22 | * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox |
| 23 | * <willy@debian.org>, Kurt Garloff <garloff@suse.de>: |
| 24 | * Support 32k/1M disks. |
| 25 | * |
| 26 | * Logging policy (needs CONFIG_SCSI_LOGGING defined): |
| 27 | * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2 |
| 28 | * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1 |
| 29 | * - entering sd_ioctl: SCSI_LOG_IOCTL level 1 |
| 30 | * - entering other commands: SCSI_LOG_HLQUEUE level 3 |
| 31 | * Note: when the logging level is set by the user, it must be greater |
| 32 | * than the level indicated above to trigger output. |
| 33 | */ |
| 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/module.h> |
| 36 | #include <linux/fs.h> |
| 37 | #include <linux/kernel.h> |
| 38 | #include <linux/sched.h> |
| 39 | #include <linux/mm.h> |
| 40 | #include <linux/bio.h> |
| 41 | #include <linux/genhd.h> |
| 42 | #include <linux/hdreg.h> |
| 43 | #include <linux/errno.h> |
| 44 | #include <linux/idr.h> |
| 45 | #include <linux/interrupt.h> |
| 46 | #include <linux/init.h> |
| 47 | #include <linux/blkdev.h> |
| 48 | #include <linux/blkpg.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/delay.h> |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 50 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <asm/uaccess.h> |
| 52 | |
| 53 | #include <scsi/scsi.h> |
| 54 | #include <scsi/scsi_cmnd.h> |
| 55 | #include <scsi/scsi_dbg.h> |
| 56 | #include <scsi/scsi_device.h> |
| 57 | #include <scsi/scsi_driver.h> |
| 58 | #include <scsi/scsi_eh.h> |
| 59 | #include <scsi/scsi_host.h> |
| 60 | #include <scsi/scsi_ioctl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #include <scsi/scsicam.h> |
| 62 | |
| 63 | #include "scsi_logging.h" |
| 64 | |
| 65 | /* |
| 66 | * More than enough for everybody ;) The huge number of majors |
| 67 | * is a leftover from 16bit dev_t days, we don't really need that |
| 68 | * much numberspace. |
| 69 | */ |
| 70 | #define SD_MAJORS 16 |
| 71 | |
Rene Herman | f018fa5 | 2006-03-08 00:14:20 -0800 | [diff] [blame] | 72 | MODULE_AUTHOR("Eric Youngdale"); |
| 73 | MODULE_DESCRIPTION("SCSI disk (sd) driver"); |
| 74 | MODULE_LICENSE("GPL"); |
| 75 | |
| 76 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); |
| 77 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); |
| 78 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); |
| 79 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); |
| 80 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); |
| 81 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); |
| 82 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); |
| 83 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); |
| 84 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); |
| 85 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); |
| 86 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); |
| 87 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); |
| 88 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); |
| 89 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); |
| 90 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); |
| 91 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); |
| 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | /* |
| 94 | * This is limited by the naming scheme enforced in sd_probe, |
| 95 | * add another character to it if you really need more disks. |
| 96 | */ |
| 97 | #define SD_MAX_DISKS (((26 * 26) + 26 + 1) * 26) |
| 98 | |
| 99 | /* |
| 100 | * Time out in seconds for disks and Magneto-opticals (which are slower). |
| 101 | */ |
| 102 | #define SD_TIMEOUT (30 * HZ) |
| 103 | #define SD_MOD_TIMEOUT (75 * HZ) |
| 104 | |
| 105 | /* |
| 106 | * Number of allowed retries |
| 107 | */ |
| 108 | #define SD_MAX_RETRIES 5 |
| 109 | #define SD_PASSTHROUGH_RETRIES 1 |
| 110 | |
Al Viro | 4897080 | 2006-02-26 08:34:10 -0600 | [diff] [blame] | 111 | /* |
| 112 | * Size of the initial data buffer for mode and read capacity data |
| 113 | */ |
| 114 | #define SD_BUF_SIZE 512 |
| 115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | struct scsi_disk { |
| 117 | struct scsi_driver *driver; /* always &sd_template */ |
| 118 | struct scsi_device *device; |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 119 | struct class_device cdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | struct gendisk *disk; |
| 121 | unsigned int openers; /* protected by BKL for now, yuck */ |
| 122 | sector_t capacity; /* size in 512-byte sectors */ |
| 123 | u32 index; |
| 124 | u8 media_present; |
| 125 | u8 write_prot; |
| 126 | unsigned WCE : 1; /* state of disk WCE bit */ |
| 127 | unsigned RCD : 1; /* state of disk RCD bit, unused */ |
Tejun Heo | 007365a | 2006-01-06 09:53:52 +0100 | [diff] [blame] | 128 | unsigned DPOFUA : 1; /* state of disk DPOFUA bit */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | }; |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 130 | #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,cdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
| 132 | static DEFINE_IDR(sd_index_idr); |
| 133 | static DEFINE_SPINLOCK(sd_index_lock); |
| 134 | |
| 135 | /* This semaphore is used to mediate the 0->1 reference get in the |
| 136 | * face of object destruction (i.e. we can't allow a get on an |
| 137 | * object after last put) */ |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 138 | static DEFINE_MUTEX(sd_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
| 140 | static int sd_revalidate_disk(struct gendisk *disk); |
| 141 | static void sd_rw_intr(struct scsi_cmnd * SCpnt); |
| 142 | |
| 143 | static int sd_probe(struct device *); |
| 144 | static int sd_remove(struct device *); |
| 145 | static void sd_shutdown(struct device *dev); |
| 146 | static void sd_rescan(struct device *); |
| 147 | static int sd_init_command(struct scsi_cmnd *); |
| 148 | static int sd_issue_flush(struct device *, sector_t *); |
Tejun Heo | 461d4e9 | 2006-01-06 09:52:55 +0100 | [diff] [blame] | 149 | static void sd_prepare_flush(request_queue_t *, struct request *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | static void sd_read_capacity(struct scsi_disk *sdkp, char *diskname, |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 151 | unsigned char *buffer); |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 152 | static void scsi_disk_release(struct class_device *cdev); |
| 153 | |
| 154 | static const char *sd_cache_types[] = { |
| 155 | "write through", "none", "write back", |
| 156 | "write back, no read (daft)" |
| 157 | }; |
| 158 | |
| 159 | static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf, |
| 160 | size_t count) |
| 161 | { |
| 162 | int i, ct = -1, rcd, wce, sp; |
| 163 | struct scsi_disk *sdkp = to_scsi_disk(cdev); |
| 164 | struct scsi_device *sdp = sdkp->device; |
| 165 | char buffer[64]; |
| 166 | char *buffer_data; |
| 167 | struct scsi_mode_data data; |
| 168 | struct scsi_sense_hdr sshdr; |
| 169 | int len; |
| 170 | |
| 171 | if (sdp->type != TYPE_DISK) |
| 172 | /* no cache control on RBC devices; theoretically they |
| 173 | * can do it, but there's probably so many exceptions |
| 174 | * it's not worth the risk */ |
| 175 | return -EINVAL; |
| 176 | |
Tobias Klauser | 6391a11 | 2006-06-08 22:23:48 -0700 | [diff] [blame] | 177 | for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 178 | const int len = strlen(sd_cache_types[i]); |
| 179 | if (strncmp(sd_cache_types[i], buf, len) == 0 && |
| 180 | buf[len] == '\n') { |
| 181 | ct = i; |
| 182 | break; |
| 183 | } |
| 184 | } |
| 185 | if (ct < 0) |
| 186 | return -EINVAL; |
| 187 | rcd = ct & 0x01 ? 1 : 0; |
| 188 | wce = ct & 0x02 ? 1 : 0; |
| 189 | if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, |
| 190 | SD_MAX_RETRIES, &data, NULL)) |
| 191 | return -EINVAL; |
Andrew Morton | a9312fb | 2006-03-25 03:08:30 -0800 | [diff] [blame] | 192 | len = min_t(size_t, sizeof(buffer), data.length - data.header_length - |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 193 | data.block_descriptor_length); |
| 194 | buffer_data = buffer + data.header_length + |
| 195 | data.block_descriptor_length; |
| 196 | buffer_data[2] &= ~0x05; |
| 197 | buffer_data[2] |= wce << 2 | rcd; |
| 198 | sp = buffer_data[0] & 0x80 ? 1 : 0; |
| 199 | |
| 200 | if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, |
| 201 | SD_MAX_RETRIES, &data, &sshdr)) { |
| 202 | if (scsi_sense_valid(&sshdr)) |
| 203 | scsi_print_sense_hdr(sdkp->disk->disk_name, &sshdr); |
| 204 | return -EINVAL; |
| 205 | } |
| 206 | sd_revalidate_disk(sdkp->disk); |
| 207 | return count; |
| 208 | } |
| 209 | |
Brian King | a144c5a | 2006-06-27 11:10:31 -0500 | [diff] [blame] | 210 | static ssize_t sd_store_allow_restart(struct class_device *cdev, const char *buf, |
| 211 | size_t count) |
| 212 | { |
| 213 | struct scsi_disk *sdkp = to_scsi_disk(cdev); |
| 214 | struct scsi_device *sdp = sdkp->device; |
| 215 | |
| 216 | if (!capable(CAP_SYS_ADMIN)) |
| 217 | return -EACCES; |
| 218 | |
| 219 | if (sdp->type != TYPE_DISK) |
| 220 | return -EINVAL; |
| 221 | |
| 222 | sdp->allow_restart = simple_strtoul(buf, NULL, 10); |
| 223 | |
| 224 | return count; |
| 225 | } |
| 226 | |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 227 | static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf) |
| 228 | { |
| 229 | struct scsi_disk *sdkp = to_scsi_disk(cdev); |
| 230 | int ct = sdkp->RCD + 2*sdkp->WCE; |
| 231 | |
| 232 | return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); |
| 233 | } |
| 234 | |
| 235 | static ssize_t sd_show_fua(struct class_device *cdev, char *buf) |
| 236 | { |
| 237 | struct scsi_disk *sdkp = to_scsi_disk(cdev); |
| 238 | |
| 239 | return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); |
| 240 | } |
| 241 | |
Brian King | a144c5a | 2006-06-27 11:10:31 -0500 | [diff] [blame] | 242 | static ssize_t sd_show_allow_restart(struct class_device *cdev, char *buf) |
| 243 | { |
| 244 | struct scsi_disk *sdkp = to_scsi_disk(cdev); |
| 245 | |
| 246 | return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); |
| 247 | } |
| 248 | |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 249 | static struct class_device_attribute sd_disk_attrs[] = { |
| 250 | __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, |
| 251 | sd_store_cache_type), |
| 252 | __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), |
Brian King | a144c5a | 2006-06-27 11:10:31 -0500 | [diff] [blame] | 253 | __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, |
| 254 | sd_store_allow_restart), |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 255 | __ATTR_NULL, |
| 256 | }; |
| 257 | |
| 258 | static struct class sd_disk_class = { |
| 259 | .name = "scsi_disk", |
| 260 | .owner = THIS_MODULE, |
| 261 | .release = scsi_disk_release, |
| 262 | .class_dev_attrs = sd_disk_attrs, |
| 263 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | |
| 265 | static struct scsi_driver sd_template = { |
| 266 | .owner = THIS_MODULE, |
| 267 | .gendrv = { |
| 268 | .name = "sd", |
| 269 | .probe = sd_probe, |
| 270 | .remove = sd_remove, |
| 271 | .shutdown = sd_shutdown, |
| 272 | }, |
| 273 | .rescan = sd_rescan, |
| 274 | .init_command = sd_init_command, |
| 275 | .issue_flush = sd_issue_flush, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | }; |
| 277 | |
| 278 | /* |
| 279 | * Device no to disk mapping: |
| 280 | * |
| 281 | * major disc2 disc p1 |
| 282 | * |............|.............|....|....| <- dev_t |
| 283 | * 31 20 19 8 7 4 3 0 |
| 284 | * |
| 285 | * Inside a major, we have 16k disks, however mapped non- |
| 286 | * contiguously. The first 16 disks are for major0, the next |
| 287 | * ones with major1, ... Disk 256 is for major0 again, disk 272 |
| 288 | * for major1, ... |
| 289 | * As we stay compatible with our numbering scheme, we can reuse |
| 290 | * the well-know SCSI majors 8, 65--71, 136--143. |
| 291 | */ |
| 292 | static int sd_major(int major_idx) |
| 293 | { |
| 294 | switch (major_idx) { |
| 295 | case 0: |
| 296 | return SCSI_DISK0_MAJOR; |
| 297 | case 1 ... 7: |
| 298 | return SCSI_DISK1_MAJOR + major_idx - 1; |
| 299 | case 8 ... 15: |
| 300 | return SCSI_DISK8_MAJOR + major_idx - 8; |
| 301 | default: |
| 302 | BUG(); |
| 303 | return 0; /* shut up gcc */ |
| 304 | } |
| 305 | } |
| 306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | static inline struct scsi_disk *scsi_disk(struct gendisk *disk) |
| 308 | { |
| 309 | return container_of(disk->private_data, struct scsi_disk, driver); |
| 310 | } |
| 311 | |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 312 | static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | { |
| 314 | struct scsi_disk *sdkp = NULL; |
| 315 | |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 316 | if (disk->private_data) { |
| 317 | sdkp = scsi_disk(disk); |
| 318 | if (scsi_device_get(sdkp->device) == 0) |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 319 | class_device_get(&sdkp->cdev); |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 320 | else |
| 321 | sdkp = NULL; |
| 322 | } |
| 323 | return sdkp; |
| 324 | } |
| 325 | |
| 326 | static struct scsi_disk *scsi_disk_get(struct gendisk *disk) |
| 327 | { |
| 328 | struct scsi_disk *sdkp; |
| 329 | |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 330 | mutex_lock(&sd_ref_mutex); |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 331 | sdkp = __scsi_disk_get(disk); |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 332 | mutex_unlock(&sd_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | return sdkp; |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 334 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 336 | static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) |
| 337 | { |
| 338 | struct scsi_disk *sdkp; |
| 339 | |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 340 | mutex_lock(&sd_ref_mutex); |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 341 | sdkp = dev_get_drvdata(dev); |
| 342 | if (sdkp) |
| 343 | sdkp = __scsi_disk_get(sdkp->disk); |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 344 | mutex_unlock(&sd_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | return sdkp; |
| 346 | } |
| 347 | |
| 348 | static void scsi_disk_put(struct scsi_disk *sdkp) |
| 349 | { |
| 350 | struct scsi_device *sdev = sdkp->device; |
| 351 | |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 352 | mutex_lock(&sd_ref_mutex); |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 353 | class_device_put(&sdkp->cdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | scsi_device_put(sdev); |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 355 | mutex_unlock(&sd_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | /** |
| 359 | * sd_init_command - build a scsi (read or write) command from |
| 360 | * information in the request structure. |
| 361 | * @SCpnt: pointer to mid-level's per scsi command structure that |
| 362 | * contains request and into which the scsi command is written |
| 363 | * |
| 364 | * Returns 1 if successful and 0 if error (or cannot be done now). |
| 365 | **/ |
| 366 | static int sd_init_command(struct scsi_cmnd * SCpnt) |
| 367 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | struct scsi_device *sdp = SCpnt->device; |
| 369 | struct request *rq = SCpnt->request; |
Christoph Hellwig | 776b23a | 2006-01-06 18:34:07 +0100 | [diff] [blame] | 370 | struct gendisk *disk = rq->rq_disk; |
| 371 | sector_t block = rq->sector; |
| 372 | unsigned int this_count = SCpnt->request_bufflen >> 9; |
| 373 | unsigned int timeout = sdp->timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
| 375 | SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, " |
| 376 | "count=%d\n", disk->disk_name, |
| 377 | (unsigned long long)block, this_count)); |
| 378 | |
| 379 | if (!sdp || !scsi_device_online(sdp) || |
| 380 | block + rq->nr_sectors > get_capacity(disk)) { |
| 381 | SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", |
| 382 | rq->nr_sectors)); |
| 383 | SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | if (sdp->changed) { |
| 388 | /* |
| 389 | * quietly refuse to do anything to a changed disc until |
| 390 | * the changed bit has been reset |
| 391 | */ |
| 392 | /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ |
| 393 | return 0; |
| 394 | } |
| 395 | SCSI_LOG_HLQUEUE(2, printk("%s : block=%llu\n", |
| 396 | disk->disk_name, (unsigned long long)block)); |
| 397 | |
| 398 | /* |
| 399 | * If we have a 1K hardware sectorsize, prevent access to single |
| 400 | * 512 byte sectors. In theory we could handle this - in fact |
| 401 | * the scsi cdrom driver must be able to handle this because |
| 402 | * we typically use 1K blocksizes, and cdroms typically have |
| 403 | * 2K hardware sectorsizes. Of course, things are simpler |
| 404 | * with the cdrom, since it is read-only. For performance |
| 405 | * reasons, the filesystems should be able to handle this |
| 406 | * and not force the scsi disk driver to use bounce buffers |
| 407 | * for this. |
| 408 | */ |
| 409 | if (sdp->sector_size == 1024) { |
| 410 | if ((block & 1) || (rq->nr_sectors & 1)) { |
| 411 | printk(KERN_ERR "sd: Bad block number requested"); |
| 412 | return 0; |
| 413 | } else { |
| 414 | block = block >> 1; |
| 415 | this_count = this_count >> 1; |
| 416 | } |
| 417 | } |
| 418 | if (sdp->sector_size == 2048) { |
| 419 | if ((block & 3) || (rq->nr_sectors & 3)) { |
| 420 | printk(KERN_ERR "sd: Bad block number requested"); |
| 421 | return 0; |
| 422 | } else { |
| 423 | block = block >> 2; |
| 424 | this_count = this_count >> 2; |
| 425 | } |
| 426 | } |
| 427 | if (sdp->sector_size == 4096) { |
| 428 | if ((block & 7) || (rq->nr_sectors & 7)) { |
| 429 | printk(KERN_ERR "sd: Bad block number requested"); |
| 430 | return 0; |
| 431 | } else { |
| 432 | block = block >> 3; |
| 433 | this_count = this_count >> 3; |
| 434 | } |
| 435 | } |
| 436 | if (rq_data_dir(rq) == WRITE) { |
| 437 | if (!sdp->writeable) { |
| 438 | return 0; |
| 439 | } |
| 440 | SCpnt->cmnd[0] = WRITE_6; |
| 441 | SCpnt->sc_data_direction = DMA_TO_DEVICE; |
| 442 | } else if (rq_data_dir(rq) == READ) { |
| 443 | SCpnt->cmnd[0] = READ_6; |
| 444 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; |
| 445 | } else { |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 446 | printk(KERN_ERR "sd: Unknown command %x\n", rq->cmd_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n", |
| 451 | disk->disk_name, (rq_data_dir(rq) == WRITE) ? |
| 452 | "writing" : "reading", this_count, rq->nr_sectors)); |
| 453 | |
| 454 | SCpnt->cmnd[1] = 0; |
| 455 | |
| 456 | if (block > 0xffffffff) { |
| 457 | SCpnt->cmnd[0] += READ_16 - READ_6; |
Tejun Heo | 007365a | 2006-01-06 09:53:52 +0100 | [diff] [blame] | 458 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; |
| 460 | SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; |
| 461 | SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; |
| 462 | SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; |
| 463 | SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; |
| 464 | SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; |
| 465 | SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; |
| 466 | SCpnt->cmnd[9] = (unsigned char) block & 0xff; |
| 467 | SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; |
| 468 | SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; |
| 469 | SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; |
| 470 | SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; |
| 471 | SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; |
| 472 | } else if ((this_count > 0xff) || (block > 0x1fffff) || |
| 473 | SCpnt->device->use_10_for_rw) { |
| 474 | if (this_count > 0xffff) |
| 475 | this_count = 0xffff; |
| 476 | |
| 477 | SCpnt->cmnd[0] += READ_10 - READ_6; |
Tejun Heo | 007365a | 2006-01-06 09:53:52 +0100 | [diff] [blame] | 478 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; |
| 480 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; |
| 481 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; |
| 482 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; |
| 483 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; |
| 484 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; |
| 485 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; |
| 486 | } else { |
Tejun Heo | 007365a | 2006-01-06 09:53:52 +0100 | [diff] [blame] | 487 | if (unlikely(blk_fua_rq(rq))) { |
| 488 | /* |
| 489 | * This happens only if this drive failed |
| 490 | * 10byte rw command with ILLEGAL_REQUEST |
| 491 | * during operation and thus turned off |
| 492 | * use_10_for_rw. |
| 493 | */ |
| 494 | printk(KERN_ERR "sd: FUA write on READ/WRITE(6) drive\n"); |
| 495 | return 0; |
| 496 | } |
| 497 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); |
| 499 | SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); |
| 500 | SCpnt->cmnd[3] = (unsigned char) block & 0xff; |
| 501 | SCpnt->cmnd[4] = (unsigned char) this_count; |
| 502 | SCpnt->cmnd[5] = 0; |
| 503 | } |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 504 | SCpnt->request_bufflen = this_count * sdp->sector_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | |
| 506 | /* |
| 507 | * We shouldn't disconnect in the middle of a sector, so with a dumb |
| 508 | * host adapter, it's safe to assume that we can at least transfer |
| 509 | * this many bytes between each connect / disconnect. |
| 510 | */ |
| 511 | SCpnt->transfersize = sdp->sector_size; |
| 512 | SCpnt->underflow = this_count << 9; |
| 513 | SCpnt->allowed = SD_MAX_RETRIES; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | SCpnt->timeout_per_command = timeout; |
| 515 | |
| 516 | /* |
| 517 | * This is the completion routine we use. This is matched in terms |
| 518 | * of capability to this function. |
| 519 | */ |
| 520 | SCpnt->done = sd_rw_intr; |
| 521 | |
| 522 | /* |
| 523 | * This indicates that the command is ready from our end to be |
| 524 | * queued. |
| 525 | */ |
| 526 | return 1; |
| 527 | } |
| 528 | |
| 529 | /** |
| 530 | * sd_open - open a scsi disk device |
| 531 | * @inode: only i_rdev member may be used |
| 532 | * @filp: only f_mode and f_flags may be used |
| 533 | * |
| 534 | * Returns 0 if successful. Returns a negated errno value in case |
| 535 | * of error. |
| 536 | * |
| 537 | * Note: This can be called from a user context (e.g. fsck(1) ) |
| 538 | * or from within the kernel (e.g. as a result of a mount(1) ). |
| 539 | * In the latter case @inode and @filp carry an abridged amount |
| 540 | * of information as noted above. |
| 541 | **/ |
| 542 | static int sd_open(struct inode *inode, struct file *filp) |
| 543 | { |
| 544 | struct gendisk *disk = inode->i_bdev->bd_disk; |
| 545 | struct scsi_disk *sdkp; |
| 546 | struct scsi_device *sdev; |
| 547 | int retval; |
| 548 | |
| 549 | if (!(sdkp = scsi_disk_get(disk))) |
| 550 | return -ENXIO; |
| 551 | |
| 552 | |
| 553 | SCSI_LOG_HLQUEUE(3, printk("sd_open: disk=%s\n", disk->disk_name)); |
| 554 | |
| 555 | sdev = sdkp->device; |
| 556 | |
| 557 | /* |
| 558 | * If the device is in error recovery, wait until it is done. |
| 559 | * If the device is offline, then disallow any access to it. |
| 560 | */ |
| 561 | retval = -ENXIO; |
| 562 | if (!scsi_block_when_processing_errors(sdev)) |
| 563 | goto error_out; |
| 564 | |
| 565 | if (sdev->removable || sdkp->write_prot) |
| 566 | check_disk_change(inode->i_bdev); |
| 567 | |
| 568 | /* |
| 569 | * If the drive is empty, just let the open fail. |
| 570 | */ |
| 571 | retval = -ENOMEDIUM; |
| 572 | if (sdev->removable && !sdkp->media_present && |
| 573 | !(filp->f_flags & O_NDELAY)) |
| 574 | goto error_out; |
| 575 | |
| 576 | /* |
| 577 | * If the device has the write protect tab set, have the open fail |
| 578 | * if the user expects to be able to write to the thing. |
| 579 | */ |
| 580 | retval = -EROFS; |
| 581 | if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE)) |
| 582 | goto error_out; |
| 583 | |
| 584 | /* |
| 585 | * It is possible that the disk changing stuff resulted in |
| 586 | * the device being taken offline. If this is the case, |
| 587 | * report this to the user, and don't pretend that the |
| 588 | * open actually succeeded. |
| 589 | */ |
| 590 | retval = -ENXIO; |
| 591 | if (!scsi_device_online(sdev)) |
| 592 | goto error_out; |
| 593 | |
| 594 | if (!sdkp->openers++ && sdev->removable) { |
| 595 | if (scsi_block_when_processing_errors(sdev)) |
| 596 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); |
| 597 | } |
| 598 | |
| 599 | return 0; |
| 600 | |
| 601 | error_out: |
| 602 | scsi_disk_put(sdkp); |
| 603 | return retval; |
| 604 | } |
| 605 | |
| 606 | /** |
| 607 | * sd_release - invoked when the (last) close(2) is called on this |
| 608 | * scsi disk. |
| 609 | * @inode: only i_rdev member may be used |
| 610 | * @filp: only f_mode and f_flags may be used |
| 611 | * |
| 612 | * Returns 0. |
| 613 | * |
| 614 | * Note: may block (uninterruptible) if error recovery is underway |
| 615 | * on this disk. |
| 616 | **/ |
| 617 | static int sd_release(struct inode *inode, struct file *filp) |
| 618 | { |
| 619 | struct gendisk *disk = inode->i_bdev->bd_disk; |
| 620 | struct scsi_disk *sdkp = scsi_disk(disk); |
| 621 | struct scsi_device *sdev = sdkp->device; |
| 622 | |
| 623 | SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk->disk_name)); |
| 624 | |
| 625 | if (!--sdkp->openers && sdev->removable) { |
| 626 | if (scsi_block_when_processing_errors(sdev)) |
| 627 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); |
| 628 | } |
| 629 | |
| 630 | /* |
| 631 | * XXX and what if there are packets in flight and this close() |
| 632 | * XXX is followed by a "rmmod sd_mod"? |
| 633 | */ |
| 634 | scsi_disk_put(sdkp); |
| 635 | return 0; |
| 636 | } |
| 637 | |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 638 | static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | { |
| 640 | struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); |
| 641 | struct scsi_device *sdp = sdkp->device; |
| 642 | struct Scsi_Host *host = sdp->host; |
| 643 | int diskinfo[4]; |
| 644 | |
| 645 | /* default to most commonly used values */ |
| 646 | diskinfo[0] = 0x40; /* 1 << 6 */ |
| 647 | diskinfo[1] = 0x20; /* 1 << 5 */ |
| 648 | diskinfo[2] = sdkp->capacity >> 11; |
| 649 | |
| 650 | /* override with calculated, extended default, or driver values */ |
| 651 | if (host->hostt->bios_param) |
| 652 | host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); |
| 653 | else |
| 654 | scsicam_bios_param(bdev, sdkp->capacity, diskinfo); |
| 655 | |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 656 | geo->heads = diskinfo[0]; |
| 657 | geo->sectors = diskinfo[1]; |
| 658 | geo->cylinders = diskinfo[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | return 0; |
| 660 | } |
| 661 | |
| 662 | /** |
| 663 | * sd_ioctl - process an ioctl |
| 664 | * @inode: only i_rdev/i_bdev members may be used |
| 665 | * @filp: only f_mode and f_flags may be used |
| 666 | * @cmd: ioctl command number |
| 667 | * @arg: this is third argument given to ioctl(2) system call. |
| 668 | * Often contains a pointer. |
| 669 | * |
| 670 | * Returns 0 if successful (some ioctls return postive numbers on |
| 671 | * success as well). Returns a negated errno value in case of error. |
| 672 | * |
| 673 | * Note: most ioctls are forward onto the block subsystem or further |
| 674 | * down in the scsi subsytem. |
| 675 | **/ |
| 676 | static int sd_ioctl(struct inode * inode, struct file * filp, |
| 677 | unsigned int cmd, unsigned long arg) |
| 678 | { |
| 679 | struct block_device *bdev = inode->i_bdev; |
| 680 | struct gendisk *disk = bdev->bd_disk; |
| 681 | struct scsi_device *sdp = scsi_disk(disk)->device; |
| 682 | void __user *p = (void __user *)arg; |
| 683 | int error; |
| 684 | |
| 685 | SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", |
| 686 | disk->disk_name, cmd)); |
| 687 | |
| 688 | /* |
| 689 | * If we are in the middle of error recovery, don't let anyone |
| 690 | * else try and use this device. Also, if error recovery fails, it |
| 691 | * may try and take the device offline, in which case all further |
| 692 | * access to the device is prohibited. |
| 693 | */ |
| 694 | error = scsi_nonblockable_ioctl(sdp, cmd, p, filp); |
| 695 | if (!scsi_block_when_processing_errors(sdp) || !error) |
| 696 | return error; |
| 697 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | /* |
| 699 | * Send SCSI addressing ioctls directly to mid level, send other |
| 700 | * ioctls to block level and then onto mid level if they can't be |
| 701 | * resolved. |
| 702 | */ |
| 703 | switch (cmd) { |
| 704 | case SCSI_IOCTL_GET_IDLUN: |
| 705 | case SCSI_IOCTL_GET_BUS_NUMBER: |
| 706 | return scsi_ioctl(sdp, cmd, p); |
| 707 | default: |
| 708 | error = scsi_cmd_ioctl(filp, disk, cmd, p); |
| 709 | if (error != -ENOTTY) |
| 710 | return error; |
| 711 | } |
| 712 | return scsi_ioctl(sdp, cmd, p); |
| 713 | } |
| 714 | |
| 715 | static void set_media_not_present(struct scsi_disk *sdkp) |
| 716 | { |
| 717 | sdkp->media_present = 0; |
| 718 | sdkp->capacity = 0; |
| 719 | sdkp->device->changed = 1; |
| 720 | } |
| 721 | |
| 722 | /** |
| 723 | * sd_media_changed - check if our medium changed |
| 724 | * @disk: kernel device descriptor |
| 725 | * |
| 726 | * Returns 0 if not applicable or no change; 1 if change |
| 727 | * |
| 728 | * Note: this function is invoked from the block subsystem. |
| 729 | **/ |
| 730 | static int sd_media_changed(struct gendisk *disk) |
| 731 | { |
| 732 | struct scsi_disk *sdkp = scsi_disk(disk); |
| 733 | struct scsi_device *sdp = sdkp->device; |
| 734 | int retval; |
| 735 | |
| 736 | SCSI_LOG_HLQUEUE(3, printk("sd_media_changed: disk=%s\n", |
| 737 | disk->disk_name)); |
| 738 | |
| 739 | if (!sdp->removable) |
| 740 | return 0; |
| 741 | |
| 742 | /* |
| 743 | * If the device is offline, don't send any commands - just pretend as |
| 744 | * if the command failed. If the device ever comes back online, we |
| 745 | * can deal with it then. It is only because of unrecoverable errors |
| 746 | * that we would ever take a device offline in the first place. |
| 747 | */ |
| 748 | if (!scsi_device_online(sdp)) |
| 749 | goto not_present; |
| 750 | |
| 751 | /* |
| 752 | * Using TEST_UNIT_READY enables differentiation between drive with |
| 753 | * no cartridge loaded - NOT READY, drive with changed cartridge - |
| 754 | * UNIT ATTENTION, or with same cartridge - GOOD STATUS. |
| 755 | * |
| 756 | * Drives that auto spin down. eg iomega jaz 1G, will be started |
| 757 | * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever |
| 758 | * sd_revalidate() is called. |
| 759 | */ |
| 760 | retval = -ENODEV; |
| 761 | if (scsi_block_when_processing_errors(sdp)) |
| 762 | retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES); |
| 763 | |
| 764 | /* |
| 765 | * Unable to test, unit probably not ready. This usually |
| 766 | * means there is no disc in the drive. Mark as changed, |
| 767 | * and we will figure it out later once the drive is |
| 768 | * available again. |
| 769 | */ |
| 770 | if (retval) |
| 771 | goto not_present; |
| 772 | |
| 773 | /* |
| 774 | * For removable scsi disk we have to recognise the presence |
| 775 | * of a disk in the drive. This is kept in the struct scsi_disk |
| 776 | * struct and tested at open ! Daniel Roche (dan@lectra.fr) |
| 777 | */ |
| 778 | sdkp->media_present = 1; |
| 779 | |
| 780 | retval = sdp->changed; |
| 781 | sdp->changed = 0; |
| 782 | |
| 783 | return retval; |
| 784 | |
| 785 | not_present: |
| 786 | set_media_not_present(sdkp); |
| 787 | return 1; |
| 788 | } |
| 789 | |
| 790 | static int sd_sync_cache(struct scsi_device *sdp) |
| 791 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | int retries, res; |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 793 | struct scsi_sense_hdr sshdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | |
| 795 | if (!scsi_device_online(sdp)) |
| 796 | return -ENODEV; |
| 797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | for (retries = 3; retries > 0; --retries) { |
| 800 | unsigned char cmd[10] = { 0 }; |
| 801 | |
| 802 | cmd[0] = SYNCHRONIZE_CACHE; |
| 803 | /* |
| 804 | * Leave the rest of the command zero to indicate |
| 805 | * flush everything. |
| 806 | */ |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 807 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, |
| 808 | SD_TIMEOUT, SD_MAX_RETRIES); |
| 809 | if (res == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | break; |
| 811 | } |
| 812 | |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 813 | if (res) { printk(KERN_WARNING "FAILED\n status = %x, message = %02x, " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | "host = %d, driver = %02x\n ", |
| 815 | status_byte(res), msg_byte(res), |
| 816 | host_byte(res), driver_byte(res)); |
| 817 | if (driver_byte(res) & DRIVER_SENSE) |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 818 | scsi_print_sense_hdr("sd", &sshdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | } |
| 820 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | return res; |
| 822 | } |
| 823 | |
| 824 | static int sd_issue_flush(struct device *dev, sector_t *error_sector) |
| 825 | { |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 826 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | struct scsi_device *sdp = to_scsi_device(dev); |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 828 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | |
| 830 | if (!sdkp) |
| 831 | return -ENODEV; |
| 832 | |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 833 | if (sdkp->WCE) |
| 834 | ret = sd_sync_cache(sdp); |
| 835 | scsi_disk_put(sdkp); |
| 836 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | } |
| 838 | |
Tejun Heo | 461d4e9 | 2006-01-06 09:52:55 +0100 | [diff] [blame] | 839 | static void sd_prepare_flush(request_queue_t *q, struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | { |
James Bottomley | c0ed79a | 2005-11-08 09:21:07 -0500 | [diff] [blame] | 841 | memset(rq->cmd, 0, sizeof(rq->cmd)); |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 842 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
James Bottomley | c0ed79a | 2005-11-08 09:21:07 -0500 | [diff] [blame] | 843 | rq->timeout = SD_TIMEOUT; |
| 844 | rq->cmd[0] = SYNCHRONIZE_CACHE; |
Tejun Heo | 461d4e9 | 2006-01-06 09:52:55 +0100 | [diff] [blame] | 845 | rq->cmd_len = 10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | } |
| 847 | |
| 848 | static void sd_rescan(struct device *dev) |
| 849 | { |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 850 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
| 851 | |
| 852 | if (sdkp) { |
| 853 | sd_revalidate_disk(sdkp->disk); |
| 854 | scsi_disk_put(sdkp); |
| 855 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
| 857 | |
| 858 | |
| 859 | #ifdef CONFIG_COMPAT |
| 860 | /* |
| 861 | * This gets directly called from VFS. When the ioctl |
| 862 | * is not recognized we go back to the other translation paths. |
| 863 | */ |
| 864 | static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 865 | { |
| 866 | struct block_device *bdev = file->f_dentry->d_inode->i_bdev; |
| 867 | struct gendisk *disk = bdev->bd_disk; |
| 868 | struct scsi_device *sdev = scsi_disk(disk)->device; |
| 869 | |
| 870 | /* |
| 871 | * If we are in the middle of error recovery, don't let anyone |
| 872 | * else try and use this device. Also, if error recovery fails, it |
| 873 | * may try and take the device offline, in which case all further |
| 874 | * access to the device is prohibited. |
| 875 | */ |
| 876 | if (!scsi_block_when_processing_errors(sdev)) |
| 877 | return -ENODEV; |
| 878 | |
| 879 | if (sdev->host->hostt->compat_ioctl) { |
| 880 | int ret; |
| 881 | |
| 882 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); |
| 883 | |
| 884 | return ret; |
| 885 | } |
| 886 | |
| 887 | /* |
| 888 | * Let the static ioctl translation table take care of it. |
| 889 | */ |
| 890 | return -ENOIOCTLCMD; |
| 891 | } |
| 892 | #endif |
| 893 | |
| 894 | static struct block_device_operations sd_fops = { |
| 895 | .owner = THIS_MODULE, |
| 896 | .open = sd_open, |
| 897 | .release = sd_release, |
| 898 | .ioctl = sd_ioctl, |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 899 | .getgeo = sd_getgeo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | #ifdef CONFIG_COMPAT |
| 901 | .compat_ioctl = sd_compat_ioctl, |
| 902 | #endif |
| 903 | .media_changed = sd_media_changed, |
| 904 | .revalidate_disk = sd_revalidate_disk, |
| 905 | }; |
| 906 | |
| 907 | /** |
| 908 | * sd_rw_intr - bottom half handler: called when the lower level |
| 909 | * driver has completed (successfully or otherwise) a scsi command. |
| 910 | * @SCpnt: mid-level's per command structure. |
| 911 | * |
| 912 | * Note: potentially run from within an ISR. Must not block. |
| 913 | **/ |
| 914 | static void sd_rw_intr(struct scsi_cmnd * SCpnt) |
| 915 | { |
| 916 | int result = SCpnt->result; |
Luben Tuikov | 03aba2f | 2006-06-23 09:39:09 -0700 | [diff] [blame] | 917 | unsigned int xfer_size = SCpnt->request_bufflen; |
| 918 | unsigned int good_bytes = result ? 0 : xfer_size; |
| 919 | u64 start_lba = SCpnt->request->sector; |
| 920 | u64 bad_lba; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | struct scsi_sense_hdr sshdr; |
| 922 | int sense_valid = 0; |
| 923 | int sense_deferred = 0; |
| 924 | int info_valid; |
| 925 | |
| 926 | if (result) { |
| 927 | sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); |
| 928 | if (sense_valid) |
| 929 | sense_deferred = scsi_sense_is_deferred(&sshdr); |
| 930 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | #ifdef CONFIG_SCSI_LOGGING |
| 932 | SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n", |
| 933 | SCpnt->request->rq_disk->disk_name, result)); |
| 934 | if (sense_valid) { |
| 935 | SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: sb[respc,sk,asc," |
| 936 | "ascq]=%x,%x,%x,%x\n", sshdr.response_code, |
| 937 | sshdr.sense_key, sshdr.asc, sshdr.ascq)); |
| 938 | } |
| 939 | #endif |
Luben Tuikov | 03aba2f | 2006-06-23 09:39:09 -0700 | [diff] [blame] | 940 | if (driver_byte(result) != DRIVER_SENSE && |
| 941 | (!sense_valid || sense_deferred)) |
| 942 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | |
Luben Tuikov | 03aba2f | 2006-06-23 09:39:09 -0700 | [diff] [blame] | 944 | switch (sshdr.sense_key) { |
| 945 | case HARDWARE_ERROR: |
| 946 | case MEDIUM_ERROR: |
| 947 | if (!blk_fs_request(SCpnt->request)) |
| 948 | goto out; |
| 949 | info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer, |
| 950 | SCSI_SENSE_BUFFERSIZE, |
| 951 | &bad_lba); |
| 952 | if (!info_valid) |
| 953 | goto out; |
| 954 | if (xfer_size <= SCpnt->device->sector_size) |
| 955 | goto out; |
| 956 | switch (SCpnt->device->sector_size) { |
| 957 | case 256: |
| 958 | start_lba <<= 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | break; |
Luben Tuikov | 03aba2f | 2006-06-23 09:39:09 -0700 | [diff] [blame] | 960 | case 512: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | break; |
Luben Tuikov | 03aba2f | 2006-06-23 09:39:09 -0700 | [diff] [blame] | 962 | case 1024: |
| 963 | start_lba >>= 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | break; |
Luben Tuikov | 03aba2f | 2006-06-23 09:39:09 -0700 | [diff] [blame] | 965 | case 2048: |
| 966 | start_lba >>= 2; |
| 967 | break; |
| 968 | case 4096: |
| 969 | start_lba >>= 3; |
| 970 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | default: |
Luben Tuikov | 03aba2f | 2006-06-23 09:39:09 -0700 | [diff] [blame] | 972 | /* Print something here with limiting frequency. */ |
| 973 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | break; |
| 975 | } |
Luben Tuikov | 03aba2f | 2006-06-23 09:39:09 -0700 | [diff] [blame] | 976 | /* This computation should always be done in terms of |
| 977 | * the resolution of the device's medium. |
| 978 | */ |
| 979 | good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size; |
| 980 | break; |
| 981 | case RECOVERED_ERROR: |
| 982 | case NO_SENSE: |
| 983 | /* Inform the user, but make sure that it's not treated |
| 984 | * as a hard error. |
| 985 | */ |
| 986 | scsi_print_sense("sd", SCpnt); |
| 987 | SCpnt->result = 0; |
| 988 | memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
| 989 | good_bytes = xfer_size; |
| 990 | break; |
| 991 | case ILLEGAL_REQUEST: |
| 992 | if (SCpnt->device->use_10_for_rw && |
| 993 | (SCpnt->cmnd[0] == READ_10 || |
| 994 | SCpnt->cmnd[0] == WRITE_10)) |
| 995 | SCpnt->device->use_10_for_rw = 0; |
| 996 | if (SCpnt->device->use_10_for_ms && |
| 997 | (SCpnt->cmnd[0] == MODE_SENSE_10 || |
| 998 | SCpnt->cmnd[0] == MODE_SELECT_10)) |
| 999 | SCpnt->device->use_10_for_ms = 0; |
| 1000 | break; |
| 1001 | default: |
| 1002 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | } |
Luben Tuikov | 03aba2f | 2006-06-23 09:39:09 -0700 | [diff] [blame] | 1004 | out: |
| 1005 | scsi_io_completion(SCpnt, good_bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | } |
| 1007 | |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1008 | static int media_not_present(struct scsi_disk *sdkp, |
| 1009 | struct scsi_sense_hdr *sshdr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1012 | if (!scsi_sense_valid(sshdr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | return 0; |
| 1014 | /* not invoked for commands that could return deferred errors */ |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1015 | if (sshdr->sense_key != NOT_READY && |
| 1016 | sshdr->sense_key != UNIT_ATTENTION) |
| 1017 | return 0; |
| 1018 | if (sshdr->asc != 0x3A) /* medium not present */ |
| 1019 | return 0; |
| 1020 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | set_media_not_present(sdkp); |
| 1022 | return 1; |
| 1023 | } |
| 1024 | |
| 1025 | /* |
| 1026 | * spinup disk - called only in sd_revalidate_disk() |
| 1027 | */ |
| 1028 | static void |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1029 | sd_spinup_disk(struct scsi_disk *sdkp, char *diskname) |
| 1030 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | unsigned char cmd[10]; |
Alan Stern | 4451e47 | 2005-07-12 10:45:17 -0400 | [diff] [blame] | 1032 | unsigned long spintime_expire = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | int retries, spintime; |
| 1034 | unsigned int the_result; |
| 1035 | struct scsi_sense_hdr sshdr; |
| 1036 | int sense_valid = 0; |
| 1037 | |
| 1038 | spintime = 0; |
| 1039 | |
| 1040 | /* Spin up drives, as required. Only do this at boot time */ |
| 1041 | /* Spinup needs to be done for module loads too. */ |
| 1042 | do { |
| 1043 | retries = 0; |
| 1044 | |
| 1045 | do { |
| 1046 | cmd[0] = TEST_UNIT_READY; |
| 1047 | memset((void *) &cmd[1], 0, 9); |
| 1048 | |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1049 | the_result = scsi_execute_req(sdkp->device, cmd, |
| 1050 | DMA_NONE, NULL, 0, |
| 1051 | &sshdr, SD_TIMEOUT, |
| 1052 | SD_MAX_RETRIES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | if (the_result) |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1055 | sense_valid = scsi_sense_valid(&sshdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | retries++; |
| 1057 | } while (retries < 3 && |
| 1058 | (!scsi_status_is_good(the_result) || |
| 1059 | ((driver_byte(the_result) & DRIVER_SENSE) && |
| 1060 | sense_valid && sshdr.sense_key == UNIT_ATTENTION))); |
| 1061 | |
| 1062 | /* |
| 1063 | * If the drive has indicated to us that it doesn't have |
| 1064 | * any media in it, don't bother with any of the rest of |
| 1065 | * this crap. |
| 1066 | */ |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1067 | if (media_not_present(sdkp, &sshdr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | return; |
| 1069 | |
| 1070 | if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { |
| 1071 | /* no sense, TUR either succeeded or failed |
| 1072 | * with a status error */ |
| 1073 | if(!spintime && !scsi_status_is_good(the_result)) |
| 1074 | printk(KERN_NOTICE "%s: Unit Not Ready, " |
| 1075 | "error = 0x%x\n", diskname, the_result); |
| 1076 | break; |
| 1077 | } |
| 1078 | |
| 1079 | /* |
| 1080 | * The device does not want the automatic start to be issued. |
| 1081 | */ |
| 1082 | if (sdkp->device->no_start_on_add) { |
| 1083 | break; |
| 1084 | } |
| 1085 | |
| 1086 | /* |
| 1087 | * If manual intervention is required, or this is an |
| 1088 | * absent USB storage device, a spinup is meaningless. |
| 1089 | */ |
| 1090 | if (sense_valid && |
| 1091 | sshdr.sense_key == NOT_READY && |
| 1092 | sshdr.asc == 4 && sshdr.ascq == 3) { |
| 1093 | break; /* manual intervention required */ |
| 1094 | |
| 1095 | /* |
| 1096 | * Issue command to spin up drive when not ready |
| 1097 | */ |
| 1098 | } else if (sense_valid && sshdr.sense_key == NOT_READY) { |
| 1099 | if (!spintime) { |
| 1100 | printk(KERN_NOTICE "%s: Spinning up disk...", |
| 1101 | diskname); |
| 1102 | cmd[0] = START_STOP; |
| 1103 | cmd[1] = 1; /* Return immediately */ |
| 1104 | memset((void *) &cmd[2], 0, 8); |
| 1105 | cmd[4] = 1; /* Start spin cycle */ |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1106 | scsi_execute_req(sdkp->device, cmd, DMA_NONE, |
| 1107 | NULL, 0, &sshdr, |
| 1108 | SD_TIMEOUT, SD_MAX_RETRIES); |
Alan Stern | 4451e47 | 2005-07-12 10:45:17 -0400 | [diff] [blame] | 1109 | spintime_expire = jiffies + 100 * HZ; |
| 1110 | spintime = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | /* Wait 1 second for next try */ |
| 1113 | msleep(1000); |
| 1114 | printk("."); |
Alan Stern | 4451e47 | 2005-07-12 10:45:17 -0400 | [diff] [blame] | 1115 | |
| 1116 | /* |
| 1117 | * Wait for USB flash devices with slow firmware. |
| 1118 | * Yes, this sense key/ASC combination shouldn't |
| 1119 | * occur here. It's characteristic of these devices. |
| 1120 | */ |
| 1121 | } else if (sense_valid && |
| 1122 | sshdr.sense_key == UNIT_ATTENTION && |
| 1123 | sshdr.asc == 0x28) { |
| 1124 | if (!spintime) { |
| 1125 | spintime_expire = jiffies + 5 * HZ; |
| 1126 | spintime = 1; |
| 1127 | } |
| 1128 | /* Wait 1 second for next try */ |
| 1129 | msleep(1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | } else { |
| 1131 | /* we don't understand the sense code, so it's |
| 1132 | * probably pointless to loop */ |
| 1133 | if(!spintime) { |
| 1134 | printk(KERN_NOTICE "%s: Unit Not Ready, " |
| 1135 | "sense:\n", diskname); |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1136 | scsi_print_sense_hdr("", &sshdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | } |
| 1138 | break; |
| 1139 | } |
| 1140 | |
Alan Stern | 4451e47 | 2005-07-12 10:45:17 -0400 | [diff] [blame] | 1141 | } while (spintime && time_before_eq(jiffies, spintime_expire)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | |
| 1143 | if (spintime) { |
| 1144 | if (scsi_status_is_good(the_result)) |
| 1145 | printk("ready\n"); |
| 1146 | else |
| 1147 | printk("not responding...\n"); |
| 1148 | } |
| 1149 | } |
| 1150 | |
| 1151 | /* |
| 1152 | * read disk capacity |
| 1153 | */ |
| 1154 | static void |
| 1155 | sd_read_capacity(struct scsi_disk *sdkp, char *diskname, |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1156 | unsigned char *buffer) |
| 1157 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | unsigned char cmd[16]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | int the_result, retries; |
| 1160 | int sector_size = 0; |
| 1161 | int longrc = 0; |
| 1162 | struct scsi_sense_hdr sshdr; |
| 1163 | int sense_valid = 0; |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1164 | struct scsi_device *sdp = sdkp->device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | |
| 1166 | repeat: |
| 1167 | retries = 3; |
| 1168 | do { |
| 1169 | if (longrc) { |
| 1170 | memset((void *) cmd, 0, 16); |
| 1171 | cmd[0] = SERVICE_ACTION_IN; |
| 1172 | cmd[1] = SAI_READ_CAPACITY_16; |
| 1173 | cmd[13] = 12; |
| 1174 | memset((void *) buffer, 0, 12); |
| 1175 | } else { |
| 1176 | cmd[0] = READ_CAPACITY; |
| 1177 | memset((void *) &cmd[1], 0, 9); |
| 1178 | memset((void *) buffer, 0, 8); |
| 1179 | } |
| 1180 | |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1181 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, |
| 1182 | buffer, longrc ? 12 : 8, &sshdr, |
| 1183 | SD_TIMEOUT, SD_MAX_RETRIES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1185 | if (media_not_present(sdkp, &sshdr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | return; |
| 1187 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | if (the_result) |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1189 | sense_valid = scsi_sense_valid(&sshdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | retries--; |
| 1191 | |
| 1192 | } while (the_result && retries); |
| 1193 | |
| 1194 | if (the_result && !longrc) { |
| 1195 | printk(KERN_NOTICE "%s : READ CAPACITY failed.\n" |
| 1196 | "%s : status=%x, message=%02x, host=%d, driver=%02x \n", |
| 1197 | diskname, diskname, |
| 1198 | status_byte(the_result), |
| 1199 | msg_byte(the_result), |
| 1200 | host_byte(the_result), |
| 1201 | driver_byte(the_result)); |
| 1202 | |
| 1203 | if (driver_byte(the_result) & DRIVER_SENSE) |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1204 | scsi_print_sense_hdr("sd", &sshdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | else |
| 1206 | printk("%s : sense not available. \n", diskname); |
| 1207 | |
| 1208 | /* Set dirty bit for removable devices if not ready - |
| 1209 | * sometimes drives will not report this properly. */ |
| 1210 | if (sdp->removable && |
| 1211 | sense_valid && sshdr.sense_key == NOT_READY) |
| 1212 | sdp->changed = 1; |
| 1213 | |
| 1214 | /* Either no media are present but the drive didn't tell us, |
| 1215 | or they are present but the read capacity command fails */ |
| 1216 | /* sdkp->media_present = 0; -- not always correct */ |
Hannes Reinecke | 69bdd88 | 2006-09-01 15:50:23 +0200 | [diff] [blame] | 1217 | sdkp->capacity = 0; /* unknown mapped to zero - as usual */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | |
| 1219 | return; |
| 1220 | } else if (the_result && longrc) { |
| 1221 | /* READ CAPACITY(16) has been failed */ |
| 1222 | printk(KERN_NOTICE "%s : READ CAPACITY(16) failed.\n" |
| 1223 | "%s : status=%x, message=%02x, host=%d, driver=%02x \n", |
| 1224 | diskname, diskname, |
| 1225 | status_byte(the_result), |
| 1226 | msg_byte(the_result), |
| 1227 | host_byte(the_result), |
| 1228 | driver_byte(the_result)); |
| 1229 | printk(KERN_NOTICE "%s : use 0xffffffff as device size\n", |
| 1230 | diskname); |
| 1231 | |
| 1232 | sdkp->capacity = 1 + (sector_t) 0xffffffff; |
| 1233 | goto got_data; |
| 1234 | } |
| 1235 | |
| 1236 | if (!longrc) { |
| 1237 | sector_size = (buffer[4] << 24) | |
| 1238 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; |
| 1239 | if (buffer[0] == 0xff && buffer[1] == 0xff && |
| 1240 | buffer[2] == 0xff && buffer[3] == 0xff) { |
| 1241 | if(sizeof(sdkp->capacity) > 4) { |
| 1242 | printk(KERN_NOTICE "%s : very big device. try to use" |
| 1243 | " READ CAPACITY(16).\n", diskname); |
| 1244 | longrc = 1; |
| 1245 | goto repeat; |
| 1246 | } |
| 1247 | printk(KERN_ERR "%s: too big for this kernel. Use a " |
| 1248 | "kernel compiled with support for large block " |
| 1249 | "devices.\n", diskname); |
| 1250 | sdkp->capacity = 0; |
| 1251 | goto got_data; |
| 1252 | } |
| 1253 | sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) | |
| 1254 | (buffer[1] << 16) | |
| 1255 | (buffer[2] << 8) | |
| 1256 | buffer[3]); |
| 1257 | } else { |
| 1258 | sdkp->capacity = 1 + (((u64)buffer[0] << 56) | |
| 1259 | ((u64)buffer[1] << 48) | |
| 1260 | ((u64)buffer[2] << 40) | |
| 1261 | ((u64)buffer[3] << 32) | |
| 1262 | ((sector_t)buffer[4] << 24) | |
| 1263 | ((sector_t)buffer[5] << 16) | |
| 1264 | ((sector_t)buffer[6] << 8) | |
| 1265 | (sector_t)buffer[7]); |
| 1266 | |
| 1267 | sector_size = (buffer[8] << 24) | |
| 1268 | (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]; |
| 1269 | } |
| 1270 | |
| 1271 | /* Some devices return the total number of sectors, not the |
| 1272 | * highest sector number. Make the necessary adjustment. */ |
| 1273 | if (sdp->fix_capacity) |
| 1274 | --sdkp->capacity; |
| 1275 | |
| 1276 | got_data: |
| 1277 | if (sector_size == 0) { |
| 1278 | sector_size = 512; |
| 1279 | printk(KERN_NOTICE "%s : sector size 0 reported, " |
| 1280 | "assuming 512.\n", diskname); |
| 1281 | } |
| 1282 | |
| 1283 | if (sector_size != 512 && |
| 1284 | sector_size != 1024 && |
| 1285 | sector_size != 2048 && |
| 1286 | sector_size != 4096 && |
| 1287 | sector_size != 256) { |
| 1288 | printk(KERN_NOTICE "%s : unsupported sector size " |
| 1289 | "%d.\n", diskname, sector_size); |
| 1290 | /* |
| 1291 | * The user might want to re-format the drive with |
| 1292 | * a supported sectorsize. Once this happens, it |
| 1293 | * would be relatively trivial to set the thing up. |
| 1294 | * For this reason, we leave the thing in the table. |
| 1295 | */ |
| 1296 | sdkp->capacity = 0; |
| 1297 | /* |
| 1298 | * set a bogus sector size so the normal read/write |
| 1299 | * logic in the block layer will eventually refuse any |
| 1300 | * request on this device without tripping over power |
| 1301 | * of two sector size assumptions |
| 1302 | */ |
| 1303 | sector_size = 512; |
| 1304 | } |
| 1305 | { |
| 1306 | /* |
| 1307 | * The msdos fs needs to know the hardware sector size |
| 1308 | * So I have created this table. See ll_rw_blk.c |
| 1309 | * Jacques Gelinas (Jacques@solucorp.qc.ca) |
| 1310 | */ |
| 1311 | int hard_sector = sector_size; |
James Bottomley | 7a691bd | 2005-10-28 13:17:30 -0500 | [diff] [blame] | 1312 | sector_t sz = (sdkp->capacity/2) * (hard_sector/256); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | request_queue_t *queue = sdp->request_queue; |
James Bottomley | 7a691bd | 2005-10-28 13:17:30 -0500 | [diff] [blame] | 1314 | sector_t mb = sz; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | |
| 1316 | blk_queue_hardsect_size(queue, hard_sector); |
| 1317 | /* avoid 64-bit division on 32-bit platforms */ |
James Bottomley | 7a691bd | 2005-10-28 13:17:30 -0500 | [diff] [blame] | 1318 | sector_div(sz, 625); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | mb -= sz - 974; |
| 1320 | sector_div(mb, 1950); |
| 1321 | |
| 1322 | printk(KERN_NOTICE "SCSI device %s: " |
| 1323 | "%llu %d-byte hdwr sectors (%llu MB)\n", |
| 1324 | diskname, (unsigned long long)sdkp->capacity, |
| 1325 | hard_sector, (unsigned long long)mb); |
| 1326 | } |
| 1327 | |
| 1328 | /* Rescale capacity to 512-byte units */ |
| 1329 | if (sector_size == 4096) |
| 1330 | sdkp->capacity <<= 3; |
| 1331 | else if (sector_size == 2048) |
| 1332 | sdkp->capacity <<= 2; |
| 1333 | else if (sector_size == 1024) |
| 1334 | sdkp->capacity <<= 1; |
| 1335 | else if (sector_size == 256) |
| 1336 | sdkp->capacity >>= 1; |
| 1337 | |
| 1338 | sdkp->device->sector_size = sector_size; |
| 1339 | } |
| 1340 | |
| 1341 | /* called with buffer of length 512 */ |
| 1342 | static inline int |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1343 | sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, |
| 1344 | unsigned char *buffer, int len, struct scsi_mode_data *data, |
| 1345 | struct scsi_sense_hdr *sshdr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | { |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1347 | return scsi_mode_sense(sdp, dbd, modepage, buffer, len, |
James Bottomley | 1cf7269 | 2005-08-28 11:27:01 -0500 | [diff] [blame] | 1348 | SD_TIMEOUT, SD_MAX_RETRIES, data, |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1349 | sshdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | } |
| 1351 | |
| 1352 | /* |
| 1353 | * read write protect setting, if possible - called only in sd_revalidate_disk() |
Al Viro | 4897080 | 2006-02-26 08:34:10 -0600 | [diff] [blame] | 1354 | * called with buffer of length SD_BUF_SIZE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | */ |
| 1356 | static void |
| 1357 | sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname, |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1358 | unsigned char *buffer) |
| 1359 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | int res; |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1361 | struct scsi_device *sdp = sdkp->device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | struct scsi_mode_data data; |
| 1363 | |
| 1364 | set_disk_ro(sdkp->disk, 0); |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1365 | if (sdp->skip_ms_page_3f) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | printk(KERN_NOTICE "%s: assuming Write Enabled\n", diskname); |
| 1367 | return; |
| 1368 | } |
| 1369 | |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1370 | if (sdp->use_192_bytes_for_3f) { |
| 1371 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | } else { |
| 1373 | /* |
| 1374 | * First attempt: ask for all pages (0x3F), but only 4 bytes. |
| 1375 | * We have to start carefully: some devices hang if we ask |
| 1376 | * for more than is available. |
| 1377 | */ |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1378 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | |
| 1380 | /* |
| 1381 | * Second attempt: ask for page 0 When only page 0 is |
| 1382 | * implemented, a request for page 3F may return Sense Key |
| 1383 | * 5: Illegal Request, Sense Code 24: Invalid field in |
| 1384 | * CDB. |
| 1385 | */ |
| 1386 | if (!scsi_status_is_good(res)) |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1387 | res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | |
| 1389 | /* |
| 1390 | * Third attempt: ask 255 bytes, as we did earlier. |
| 1391 | */ |
| 1392 | if (!scsi_status_is_good(res)) |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1393 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, |
| 1394 | &data, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | } |
| 1396 | |
| 1397 | if (!scsi_status_is_good(res)) { |
| 1398 | printk(KERN_WARNING |
| 1399 | "%s: test WP failed, assume Write Enabled\n", diskname); |
| 1400 | } else { |
| 1401 | sdkp->write_prot = ((data.device_specific & 0x80) != 0); |
| 1402 | set_disk_ro(sdkp->disk, sdkp->write_prot); |
| 1403 | printk(KERN_NOTICE "%s: Write Protect is %s\n", diskname, |
| 1404 | sdkp->write_prot ? "on" : "off"); |
| 1405 | printk(KERN_DEBUG "%s: Mode Sense: %02x %02x %02x %02x\n", |
| 1406 | diskname, buffer[0], buffer[1], buffer[2], buffer[3]); |
| 1407 | } |
| 1408 | } |
| 1409 | |
| 1410 | /* |
| 1411 | * sd_read_cache_type - called only from sd_revalidate_disk() |
Al Viro | 4897080 | 2006-02-26 08:34:10 -0600 | [diff] [blame] | 1412 | * called with buffer of length SD_BUF_SIZE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | */ |
| 1414 | static void |
| 1415 | sd_read_cache_type(struct scsi_disk *sdkp, char *diskname, |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1416 | unsigned char *buffer) |
Al Viro | 631e8a1 | 2005-05-16 01:59:55 +0100 | [diff] [blame] | 1417 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | int len = 0, res; |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1419 | struct scsi_device *sdp = sdkp->device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | |
Al Viro | 631e8a1 | 2005-05-16 01:59:55 +0100 | [diff] [blame] | 1421 | int dbd; |
| 1422 | int modepage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | struct scsi_mode_data data; |
| 1424 | struct scsi_sense_hdr sshdr; |
| 1425 | |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1426 | if (sdp->skip_ms_page_8) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | goto defaults; |
| 1428 | |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1429 | if (sdp->type == TYPE_RBC) { |
Al Viro | 631e8a1 | 2005-05-16 01:59:55 +0100 | [diff] [blame] | 1430 | modepage = 6; |
| 1431 | dbd = 8; |
| 1432 | } else { |
| 1433 | modepage = 8; |
| 1434 | dbd = 0; |
| 1435 | } |
| 1436 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | /* cautiously ask */ |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1438 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | |
| 1440 | if (!scsi_status_is_good(res)) |
| 1441 | goto bad_sense; |
| 1442 | |
Al Viro | 6d73c85 | 2006-02-23 02:03:16 +0100 | [diff] [blame] | 1443 | if (!data.header_length) { |
| 1444 | modepage = 6; |
| 1445 | printk(KERN_ERR "%s: missing header in MODE_SENSE response\n", |
| 1446 | diskname); |
| 1447 | } |
| 1448 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | /* that went OK, now ask for the proper length */ |
| 1450 | len = data.length; |
| 1451 | |
| 1452 | /* |
| 1453 | * We're only interested in the first three bytes, actually. |
| 1454 | * But the data cache page is defined for the first 20. |
| 1455 | */ |
| 1456 | if (len < 3) |
| 1457 | goto bad_sense; |
| 1458 | if (len > 20) |
| 1459 | len = 20; |
| 1460 | |
| 1461 | /* Take headers and block descriptors into account */ |
| 1462 | len += data.header_length + data.block_descriptor_length; |
Al Viro | 4897080 | 2006-02-26 08:34:10 -0600 | [diff] [blame] | 1463 | if (len > SD_BUF_SIZE) |
| 1464 | goto bad_sense; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | |
| 1466 | /* Get the data */ |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1467 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | |
| 1469 | if (scsi_status_is_good(res)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | int ct = 0; |
Al Viro | 631e8a1 | 2005-05-16 01:59:55 +0100 | [diff] [blame] | 1471 | int offset = data.header_length + data.block_descriptor_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | |
Al Viro | 4897080 | 2006-02-26 08:34:10 -0600 | [diff] [blame] | 1473 | if (offset >= SD_BUF_SIZE - 2) { |
| 1474 | printk(KERN_ERR "%s: malformed MODE SENSE response", |
| 1475 | diskname); |
| 1476 | goto defaults; |
| 1477 | } |
| 1478 | |
Al Viro | 631e8a1 | 2005-05-16 01:59:55 +0100 | [diff] [blame] | 1479 | if ((buffer[offset] & 0x3f) != modepage) { |
| 1480 | printk(KERN_ERR "%s: got wrong page\n", diskname); |
| 1481 | goto defaults; |
| 1482 | } |
| 1483 | |
| 1484 | if (modepage == 8) { |
| 1485 | sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); |
| 1486 | sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); |
| 1487 | } else { |
| 1488 | sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); |
| 1489 | sdkp->RCD = 0; |
| 1490 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | |
Tejun Heo | 007365a | 2006-01-06 09:53:52 +0100 | [diff] [blame] | 1492 | sdkp->DPOFUA = (data.device_specific & 0x10) != 0; |
| 1493 | if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { |
| 1494 | printk(KERN_NOTICE "SCSI device %s: uses " |
| 1495 | "READ/WRITE(6), disabling FUA\n", diskname); |
| 1496 | sdkp->DPOFUA = 0; |
| 1497 | } |
| 1498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | ct = sdkp->RCD + 2*sdkp->WCE; |
| 1500 | |
Tejun Heo | 007365a | 2006-01-06 09:53:52 +0100 | [diff] [blame] | 1501 | printk(KERN_NOTICE "SCSI device %s: drive cache: %s%s\n", |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1502 | diskname, sd_cache_types[ct], |
Tejun Heo | 007365a | 2006-01-06 09:53:52 +0100 | [diff] [blame] | 1503 | sdkp->DPOFUA ? " w/ FUA" : ""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | |
| 1505 | return; |
| 1506 | } |
| 1507 | |
| 1508 | bad_sense: |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1509 | if (scsi_sense_valid(&sshdr) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | sshdr.sense_key == ILLEGAL_REQUEST && |
| 1511 | sshdr.asc == 0x24 && sshdr.ascq == 0x0) |
| 1512 | printk(KERN_NOTICE "%s: cache data unavailable\n", |
| 1513 | diskname); /* Invalid field in CDB */ |
| 1514 | else |
| 1515 | printk(KERN_ERR "%s: asking for cache data failed\n", |
| 1516 | diskname); |
| 1517 | |
| 1518 | defaults: |
| 1519 | printk(KERN_ERR "%s: assuming drive cache: write through\n", |
| 1520 | diskname); |
| 1521 | sdkp->WCE = 0; |
| 1522 | sdkp->RCD = 0; |
Al Viro | 4897080 | 2006-02-26 08:34:10 -0600 | [diff] [blame] | 1523 | sdkp->DPOFUA = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | } |
| 1525 | |
| 1526 | /** |
| 1527 | * sd_revalidate_disk - called the first time a new disk is seen, |
| 1528 | * performs disk spin up, read_capacity, etc. |
| 1529 | * @disk: struct gendisk we care about |
| 1530 | **/ |
| 1531 | static int sd_revalidate_disk(struct gendisk *disk) |
| 1532 | { |
| 1533 | struct scsi_disk *sdkp = scsi_disk(disk); |
| 1534 | struct scsi_device *sdp = sdkp->device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | unsigned char *buffer; |
Tejun Heo | 461d4e9 | 2006-01-06 09:52:55 +0100 | [diff] [blame] | 1536 | unsigned ordered; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | |
| 1538 | SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk->disk_name)); |
| 1539 | |
| 1540 | /* |
| 1541 | * If the device is offline, don't try and read capacity or any |
| 1542 | * of the other niceties. |
| 1543 | */ |
| 1544 | if (!scsi_device_online(sdp)) |
| 1545 | goto out; |
| 1546 | |
Al Viro | 4897080 | 2006-02-26 08:34:10 -0600 | [diff] [blame] | 1547 | buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL | __GFP_DMA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | if (!buffer) { |
| 1549 | printk(KERN_WARNING "(sd_revalidate_disk:) Memory allocation " |
| 1550 | "failure.\n"); |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1551 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | } |
| 1553 | |
| 1554 | /* defaults, until the device tells us otherwise */ |
| 1555 | sdp->sector_size = 512; |
| 1556 | sdkp->capacity = 0; |
| 1557 | sdkp->media_present = 1; |
| 1558 | sdkp->write_prot = 0; |
| 1559 | sdkp->WCE = 0; |
| 1560 | sdkp->RCD = 0; |
| 1561 | |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1562 | sd_spinup_disk(sdkp, disk->disk_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | |
| 1564 | /* |
| 1565 | * Without media there is no reason to ask; moreover, some devices |
| 1566 | * react badly if we do. |
| 1567 | */ |
| 1568 | if (sdkp->media_present) { |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1569 | sd_read_capacity(sdkp, disk->disk_name, buffer); |
Alan Stern | 38d76df | 2005-12-09 11:34:45 -0500 | [diff] [blame] | 1570 | sd_read_write_protect_flag(sdkp, disk->disk_name, buffer); |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1571 | sd_read_cache_type(sdkp, disk->disk_name, buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | } |
Tejun Heo | 461d4e9 | 2006-01-06 09:52:55 +0100 | [diff] [blame] | 1573 | |
| 1574 | /* |
| 1575 | * We now have all cache related info, determine how we deal |
| 1576 | * with ordered requests. Note that as the current SCSI |
| 1577 | * dispatch function can alter request order, we cannot use |
| 1578 | * QUEUE_ORDERED_TAG_* even when ordered tag is supported. |
| 1579 | */ |
| 1580 | if (sdkp->WCE) |
Tejun Heo | 007365a | 2006-01-06 09:53:52 +0100 | [diff] [blame] | 1581 | ordered = sdkp->DPOFUA |
| 1582 | ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; |
Tejun Heo | 461d4e9 | 2006-01-06 09:52:55 +0100 | [diff] [blame] | 1583 | else |
| 1584 | ordered = QUEUE_ORDERED_DRAIN; |
| 1585 | |
| 1586 | blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); |
| 1587 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | set_capacity(disk, sdkp->capacity); |
| 1589 | kfree(buffer); |
| 1590 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | out: |
| 1592 | return 0; |
| 1593 | } |
| 1594 | |
| 1595 | /** |
| 1596 | * sd_probe - called during driver initialization and whenever a |
| 1597 | * new scsi device is attached to the system. It is called once |
| 1598 | * for each scsi device (not just disks) present. |
| 1599 | * @dev: pointer to device object |
| 1600 | * |
| 1601 | * Returns 0 if successful (or not interested in this scsi device |
| 1602 | * (e.g. scanner)); 1 when there is an error. |
| 1603 | * |
| 1604 | * Note: this function is invoked from the scsi mid-level. |
| 1605 | * This function sets up the mapping between a given |
| 1606 | * <host,channel,id,lun> (found in sdp) and new device name |
| 1607 | * (e.g. /dev/sda). More precisely it is the block device major |
| 1608 | * and minor number that is chosen here. |
| 1609 | * |
| 1610 | * Assume sd_attach is not re-entrant (for time being) |
| 1611 | * Also think about sd_attach() and sd_remove() running coincidentally. |
| 1612 | **/ |
| 1613 | static int sd_probe(struct device *dev) |
| 1614 | { |
| 1615 | struct scsi_device *sdp = to_scsi_device(dev); |
| 1616 | struct scsi_disk *sdkp; |
| 1617 | struct gendisk *gd; |
| 1618 | u32 index; |
| 1619 | int error; |
| 1620 | |
| 1621 | error = -ENODEV; |
Al Viro | 631e8a1 | 2005-05-16 01:59:55 +0100 | [diff] [blame] | 1622 | if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | goto out; |
| 1624 | |
James Bottomley | 9ccfc75 | 2005-10-02 11:45:08 -0500 | [diff] [blame] | 1625 | SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, |
| 1626 | "sd_attach\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | |
| 1628 | error = -ENOMEM; |
Jes Sorensen | 24669f75 | 2006-01-16 10:31:18 -0500 | [diff] [blame] | 1629 | sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | if (!sdkp) |
| 1631 | goto out; |
| 1632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | gd = alloc_disk(16); |
| 1634 | if (!gd) |
| 1635 | goto out_free; |
| 1636 | |
| 1637 | if (!idr_pre_get(&sd_index_idr, GFP_KERNEL)) |
| 1638 | goto out_put; |
| 1639 | |
| 1640 | spin_lock(&sd_index_lock); |
| 1641 | error = idr_get_new(&sd_index_idr, NULL, &index); |
| 1642 | spin_unlock(&sd_index_lock); |
| 1643 | |
| 1644 | if (index >= SD_MAX_DISKS) |
| 1645 | error = -EBUSY; |
| 1646 | if (error) |
| 1647 | goto out_put; |
| 1648 | |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1649 | class_device_initialize(&sdkp->cdev); |
| 1650 | sdkp->cdev.dev = &sdp->sdev_gendev; |
| 1651 | sdkp->cdev.class = &sd_disk_class; |
| 1652 | strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE); |
| 1653 | |
| 1654 | if (class_device_add(&sdkp->cdev)) |
| 1655 | goto out_put; |
| 1656 | |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 1657 | get_device(&sdp->sdev_gendev); |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1658 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | sdkp->device = sdp; |
| 1660 | sdkp->driver = &sd_template; |
| 1661 | sdkp->disk = gd; |
| 1662 | sdkp->index = index; |
| 1663 | sdkp->openers = 0; |
| 1664 | |
| 1665 | if (!sdp->timeout) { |
Al Viro | 631e8a1 | 2005-05-16 01:59:55 +0100 | [diff] [blame] | 1666 | if (sdp->type != TYPE_MOD) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | sdp->timeout = SD_TIMEOUT; |
| 1668 | else |
| 1669 | sdp->timeout = SD_MOD_TIMEOUT; |
| 1670 | } |
| 1671 | |
| 1672 | gd->major = sd_major((index & 0xf0) >> 4); |
| 1673 | gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); |
| 1674 | gd->minors = 16; |
| 1675 | gd->fops = &sd_fops; |
| 1676 | |
| 1677 | if (index < 26) { |
| 1678 | sprintf(gd->disk_name, "sd%c", 'a' + index % 26); |
| 1679 | } else if (index < (26 + 1) * 26) { |
| 1680 | sprintf(gd->disk_name, "sd%c%c", |
| 1681 | 'a' + index / 26 - 1,'a' + index % 26); |
| 1682 | } else { |
| 1683 | const unsigned int m1 = (index / 26 - 1) / 26 - 1; |
| 1684 | const unsigned int m2 = (index / 26 - 1) % 26; |
| 1685 | const unsigned int m3 = index % 26; |
| 1686 | sprintf(gd->disk_name, "sd%c%c%c", |
| 1687 | 'a' + m1, 'a' + m2, 'a' + m3); |
| 1688 | } |
| 1689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | gd->private_data = &sdkp->driver; |
Tejun Heo | 461d4e9 | 2006-01-06 09:52:55 +0100 | [diff] [blame] | 1691 | gd->queue = sdkp->device->request_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | |
| 1693 | sd_revalidate_disk(gd); |
| 1694 | |
| 1695 | gd->driverfs_dev = &sdp->sdev_gendev; |
| 1696 | gd->flags = GENHD_FL_DRIVERFS; |
| 1697 | if (sdp->removable) |
| 1698 | gd->flags |= GENHD_FL_REMOVABLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | |
| 1700 | dev_set_drvdata(dev, sdkp); |
| 1701 | add_disk(gd); |
| 1702 | |
James Bottomley | 9ccfc75 | 2005-10-02 11:45:08 -0500 | [diff] [blame] | 1703 | sdev_printk(KERN_NOTICE, sdp, "Attached scsi %sdisk %s\n", |
| 1704 | sdp->removable ? "removable " : "", gd->disk_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | |
| 1706 | return 0; |
| 1707 | |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1708 | out_put: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | put_disk(gd); |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1710 | out_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | kfree(sdkp); |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1712 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | return error; |
| 1714 | } |
| 1715 | |
| 1716 | /** |
| 1717 | * sd_remove - called whenever a scsi disk (previously recognized by |
| 1718 | * sd_probe) is detached from the system. It is called (potentially |
| 1719 | * multiple times) during sd module unload. |
| 1720 | * @sdp: pointer to mid level scsi device object |
| 1721 | * |
| 1722 | * Note: this function is invoked from the scsi mid-level. |
| 1723 | * This function potentially frees up a device name (e.g. /dev/sdc) |
| 1724 | * that could be re-used by a subsequent sd_probe(). |
| 1725 | * This function is not called when the built-in sd driver is "exit-ed". |
| 1726 | **/ |
| 1727 | static int sd_remove(struct device *dev) |
| 1728 | { |
| 1729 | struct scsi_disk *sdkp = dev_get_drvdata(dev); |
| 1730 | |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1731 | class_device_del(&sdkp->cdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | del_gendisk(sdkp->disk); |
| 1733 | sd_shutdown(dev); |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 1734 | |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 1735 | mutex_lock(&sd_ref_mutex); |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 1736 | dev_set_drvdata(dev, NULL); |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1737 | class_device_put(&sdkp->cdev); |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 1738 | mutex_unlock(&sd_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | |
| 1740 | return 0; |
| 1741 | } |
| 1742 | |
| 1743 | /** |
| 1744 | * scsi_disk_release - Called to free the scsi_disk structure |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1745 | * @cdev: pointer to embedded class device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | * |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 1747 | * sd_ref_mutex must be held entering this routine. Because it is |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | * called on last put, you should always use the scsi_disk_get() |
| 1749 | * scsi_disk_put() helpers which manipulate the semaphore directly |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1750 | * and never do a direct class_device_put(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | **/ |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1752 | static void scsi_disk_release(struct class_device *cdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | { |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1754 | struct scsi_disk *sdkp = to_scsi_disk(cdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | struct gendisk *disk = sdkp->disk; |
| 1756 | |
| 1757 | spin_lock(&sd_index_lock); |
| 1758 | idr_remove(&sd_index_idr, sdkp->index); |
| 1759 | spin_unlock(&sd_index_lock); |
| 1760 | |
| 1761 | disk->private_data = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | put_disk(disk); |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 1763 | put_device(&sdkp->device->sdev_gendev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | |
| 1765 | kfree(sdkp); |
| 1766 | } |
| 1767 | |
| 1768 | /* |
| 1769 | * Send a SYNCHRONIZE CACHE instruction down to the device through |
| 1770 | * the normal SCSI command structure. Wait for the command to |
| 1771 | * complete. |
| 1772 | */ |
| 1773 | static void sd_shutdown(struct device *dev) |
| 1774 | { |
| 1775 | struct scsi_device *sdp = to_scsi_device(dev); |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 1776 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | |
| 1778 | if (!sdkp) |
| 1779 | return; /* this can happen */ |
| 1780 | |
Alan Stern | 39b7f1e | 2005-11-04 14:44:41 -0500 | [diff] [blame] | 1781 | if (sdkp->WCE) { |
| 1782 | printk(KERN_NOTICE "Synchronizing SCSI cache for disk %s: \n", |
| 1783 | sdkp->disk->disk_name); |
| 1784 | sd_sync_cache(sdp); |
| 1785 | } |
| 1786 | scsi_disk_put(sdkp); |
| 1787 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1788 | |
| 1789 | /** |
| 1790 | * init_sd - entry point for this driver (both when built in or when |
| 1791 | * a module). |
| 1792 | * |
| 1793 | * Note: this function registers this driver with the scsi mid-level. |
| 1794 | **/ |
| 1795 | static int __init init_sd(void) |
| 1796 | { |
| 1797 | int majors = 0, i; |
| 1798 | |
| 1799 | SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); |
| 1800 | |
| 1801 | for (i = 0; i < SD_MAJORS; i++) |
| 1802 | if (register_blkdev(sd_major(i), "sd") == 0) |
| 1803 | majors++; |
| 1804 | |
| 1805 | if (!majors) |
| 1806 | return -ENODEV; |
| 1807 | |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1808 | class_register(&sd_disk_class); |
| 1809 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | return scsi_register_driver(&sd_template.gendrv); |
| 1811 | } |
| 1812 | |
| 1813 | /** |
| 1814 | * exit_sd - exit point for this driver (when it is a module). |
| 1815 | * |
| 1816 | * Note: this function unregisters this driver from the scsi mid-level. |
| 1817 | **/ |
| 1818 | static void __exit exit_sd(void) |
| 1819 | { |
| 1820 | int i; |
| 1821 | |
| 1822 | SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); |
| 1823 | |
| 1824 | scsi_unregister_driver(&sd_template.gendrv); |
| 1825 | for (i = 0; i < SD_MAJORS; i++) |
| 1826 | unregister_blkdev(sd_major(i), "sd"); |
James Bottomley | 6bdaa1f | 2006-03-18 14:14:21 -0600 | [diff] [blame] | 1827 | |
| 1828 | class_unregister(&sd_disk_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | } |
| 1830 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | module_init(init_sd); |
| 1832 | module_exit(exit_sd); |