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1 | /* |
2 | libata-scsi.c - helper library for ATA | |
3 | ||
4 | Copyright 2003-2004 Red Hat, Inc. All rights reserved. | |
5 | Copyright 2003-2004 Jeff Garzik | |
6 | ||
7 | The contents of this file are subject to the Open | |
8 | Software License version 1.1 that can be found at | |
9 | http://www.opensource.org/licenses/osl-1.1.txt and is included herein | |
10 | by reference. | |
11 | ||
12 | Alternatively, the contents of this file may be used under the terms | |
13 | of the GNU General Public License version 2 (the "GPL") as distributed | |
14 | in the kernel source COPYING file, in which case the provisions of | |
15 | the GPL are applicable instead of the above. If you wish to allow | |
16 | the use of your version of this file only under the terms of the | |
17 | GPL and not to allow others to use your version of this file under | |
18 | the OSL, indicate your decision by deleting the provisions above and | |
19 | replace them with the notice and other provisions required by the GPL. | |
20 | If you do not delete the provisions above, a recipient may use your | |
21 | version of this file under either the OSL or the GPL. | |
22 | ||
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/blkdev.h> | |
27 | #include <linux/spinlock.h> | |
28 | #include <scsi/scsi.h> | |
29 | #include "scsi.h" | |
30 | #include <scsi/scsi_host.h> | |
31 | #include <linux/libata.h> | |
32 | #include <asm/uaccess.h> | |
33 | ||
34 | #include "libata.h" | |
35 | ||
36 | typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, u8 *scsicmd); | |
37 | static struct ata_device * | |
38 | ata_scsi_find_dev(struct ata_port *ap, struct scsi_device *scsidev); | |
39 | ||
40 | ||
41 | /** | |
42 | * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. | |
43 | * @sdev: SCSI device for which BIOS geometry is to be determined | |
44 | * @bdev: block device associated with @sdev | |
45 | * @capacity: capacity of SCSI device | |
46 | * @geom: location to which geometry will be output | |
47 | * | |
48 | * Generic bios head/sector/cylinder calculator | |
49 | * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) | |
50 | * mapping. Some situations may arise where the disk is not | |
51 | * bootable if this is not used. | |
52 | * | |
53 | * LOCKING: | |
54 | * Defined by the SCSI layer. We don't really care. | |
55 | * | |
56 | * RETURNS: | |
57 | * Zero. | |
58 | */ | |
59 | int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, | |
60 | sector_t capacity, int geom[]) | |
61 | { | |
62 | geom[0] = 255; | |
63 | geom[1] = 63; | |
64 | sector_div(capacity, 255*63); | |
65 | geom[2] = capacity; | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg) | |
71 | { | |
72 | struct ata_port *ap; | |
73 | struct ata_device *dev; | |
74 | int val = -EINVAL, rc = -EINVAL; | |
75 | ||
76 | ap = (struct ata_port *) &scsidev->host->hostdata[0]; | |
77 | if (!ap) | |
78 | goto out; | |
79 | ||
80 | dev = ata_scsi_find_dev(ap, scsidev); | |
81 | if (!dev) { | |
82 | rc = -ENODEV; | |
83 | goto out; | |
84 | } | |
85 | ||
86 | switch (cmd) { | |
87 | case ATA_IOC_GET_IO32: | |
88 | val = 0; | |
89 | if (copy_to_user(arg, &val, 1)) | |
90 | return -EFAULT; | |
91 | return 0; | |
92 | ||
93 | case ATA_IOC_SET_IO32: | |
94 | val = (unsigned long) arg; | |
95 | if (val != 0) | |
96 | return -EINVAL; | |
97 | return 0; | |
98 | ||
99 | default: | |
100 | rc = -ENOTTY; | |
101 | break; | |
102 | } | |
103 | ||
104 | out: | |
105 | return rc; | |
106 | } | |
107 | ||
108 | /** | |
109 | * ata_scsi_qc_new - acquire new ata_queued_cmd reference | |
110 | * @ap: ATA port to which the new command is attached | |
111 | * @dev: ATA device to which the new command is attached | |
112 | * @cmd: SCSI command that originated this ATA command | |
113 | * @done: SCSI command completion function | |
114 | * | |
115 | * Obtain a reference to an unused ata_queued_cmd structure, | |
116 | * which is the basic libata structure representing a single | |
117 | * ATA command sent to the hardware. | |
118 | * | |
119 | * If a command was available, fill in the SCSI-specific | |
120 | * portions of the structure with information on the | |
121 | * current command. | |
122 | * | |
123 | * LOCKING: | |
124 | * spin_lock_irqsave(host_set lock) | |
125 | * | |
126 | * RETURNS: | |
127 | * Command allocated, or %NULL if none available. | |
128 | */ | |
129 | struct ata_queued_cmd *ata_scsi_qc_new(struct ata_port *ap, | |
130 | struct ata_device *dev, | |
131 | struct scsi_cmnd *cmd, | |
132 | void (*done)(struct scsi_cmnd *)) | |
133 | { | |
134 | struct ata_queued_cmd *qc; | |
135 | ||
136 | qc = ata_qc_new_init(ap, dev); | |
137 | if (qc) { | |
138 | qc->scsicmd = cmd; | |
139 | qc->scsidone = done; | |
140 | ||
141 | if (cmd->use_sg) { | |
142 | qc->sg = (struct scatterlist *) cmd->request_buffer; | |
143 | qc->n_elem = cmd->use_sg; | |
144 | } else { | |
145 | qc->sg = &qc->sgent; | |
146 | qc->n_elem = 1; | |
147 | } | |
148 | } else { | |
149 | cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1); | |
150 | done(cmd); | |
151 | } | |
152 | ||
153 | return qc; | |
154 | } | |
155 | ||
156 | /** | |
157 | * ata_to_sense_error - convert ATA error to SCSI error | |
158 | * @qc: Command that we are erroring out | |
159 | * @drv_stat: value contained in ATA status register | |
160 | * | |
161 | * Converts an ATA error into a SCSI error. While we are at it | |
162 | * we decode and dump the ATA error for the user so that they | |
163 | * have some idea what really happened at the non make-believe | |
164 | * layer. | |
165 | * | |
166 | * LOCKING: | |
167 | * spin_lock_irqsave(host_set lock) | |
168 | */ | |
169 | ||
170 | void ata_to_sense_error(struct ata_queued_cmd *qc, u8 drv_stat) | |
171 | { | |
172 | struct scsi_cmnd *cmd = qc->scsicmd; | |
173 | u8 err = 0; | |
174 | unsigned char *sb = cmd->sense_buffer; | |
175 | /* Based on the 3ware driver translation table */ | |
176 | static unsigned char sense_table[][4] = { | |
177 | /* BBD|ECC|ID|MAR */ | |
178 | {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command | |
179 | /* BBD|ECC|ID */ | |
180 | {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command | |
181 | /* ECC|MC|MARK */ | |
182 | {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error | |
183 | /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ | |
184 | {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error | |
185 | /* MC|ID|ABRT|TRK0|MARK */ | |
186 | {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready | |
187 | /* MCR|MARK */ | |
188 | {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready | |
189 | /* Bad address mark */ | |
190 | {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field | |
191 | /* TRK0 */ | |
192 | {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error | |
193 | /* Abort & !ICRC */ | |
194 | {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command | |
195 | /* Media change request */ | |
196 | {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline | |
197 | /* SRV */ | |
198 | {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found | |
199 | /* Media change */ | |
200 | {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline | |
201 | /* ECC */ | |
202 | {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error | |
203 | /* BBD - block marked bad */ | |
204 | {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error | |
205 | {0xFF, 0xFF, 0xFF, 0xFF}, // END mark | |
206 | }; | |
207 | static unsigned char stat_table[][4] = { | |
208 | /* Must be first because BUSY means no other bits valid */ | |
209 | {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now | |
210 | {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault | |
211 | {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now | |
212 | {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered | |
213 | {0xFF, 0xFF, 0xFF, 0xFF}, // END mark | |
214 | }; | |
215 | int i = 0; | |
216 | ||
217 | cmd->result = SAM_STAT_CHECK_CONDITION; | |
218 | ||
219 | /* | |
220 | * Is this an error we can process/parse | |
221 | */ | |
222 | ||
223 | if(drv_stat & ATA_ERR) | |
224 | /* Read the err bits */ | |
225 | err = ata_chk_err(qc->ap); | |
226 | ||
227 | /* Display the ATA level error info */ | |
228 | ||
229 | printk(KERN_WARNING "ata%u: status=0x%02x { ", qc->ap->id, drv_stat); | |
230 | if(drv_stat & 0x80) | |
231 | { | |
232 | printk("Busy "); | |
233 | err = 0; /* Data is not valid in this case */ | |
234 | } | |
235 | else { | |
236 | if(drv_stat & 0x40) printk("DriveReady "); | |
237 | if(drv_stat & 0x20) printk("DeviceFault "); | |
238 | if(drv_stat & 0x10) printk("SeekComplete "); | |
239 | if(drv_stat & 0x08) printk("DataRequest "); | |
240 | if(drv_stat & 0x04) printk("CorrectedError "); | |
241 | if(drv_stat & 0x02) printk("Index "); | |
242 | if(drv_stat & 0x01) printk("Error "); | |
243 | } | |
244 | printk("}\n"); | |
245 | ||
246 | if(err) | |
247 | { | |
248 | printk(KERN_WARNING "ata%u: error=0x%02x { ", qc->ap->id, err); | |
249 | if(err & 0x04) printk("DriveStatusError "); | |
250 | if(err & 0x80) | |
251 | { | |
252 | if(err & 0x04) | |
253 | printk("BadCRC "); | |
254 | else | |
255 | printk("Sector "); | |
256 | } | |
257 | if(err & 0x40) printk("UncorrectableError "); | |
258 | if(err & 0x10) printk("SectorIdNotFound "); | |
259 | if(err & 0x02) printk("TrackZeroNotFound "); | |
260 | if(err & 0x01) printk("AddrMarkNotFound "); | |
261 | printk("}\n"); | |
262 | ||
263 | /* Should we dump sector info here too ?? */ | |
264 | } | |
265 | ||
266 | ||
267 | /* Look for err */ | |
268 | while(sense_table[i][0] != 0xFF) | |
269 | { | |
270 | /* Look for best matches first */ | |
271 | if((sense_table[i][0] & err) == sense_table[i][0]) | |
272 | { | |
273 | sb[0] = 0x70; | |
274 | sb[2] = sense_table[i][1]; | |
275 | sb[7] = 0x0a; | |
276 | sb[12] = sense_table[i][2]; | |
277 | sb[13] = sense_table[i][3]; | |
278 | return; | |
279 | } | |
280 | i++; | |
281 | } | |
282 | /* No immediate match */ | |
283 | if(err) | |
284 | printk(KERN_DEBUG "ata%u: no sense translation for 0x%02x\n", qc->ap->id, err); | |
285 | ||
286 | i = 0; | |
287 | /* Fall back to interpreting status bits */ | |
288 | while(stat_table[i][0] != 0xFF) | |
289 | { | |
290 | if(stat_table[i][0] & drv_stat) | |
291 | { | |
292 | sb[0] = 0x70; | |
293 | sb[2] = stat_table[i][1]; | |
294 | sb[7] = 0x0a; | |
295 | sb[12] = stat_table[i][2]; | |
296 | sb[13] = stat_table[i][3]; | |
297 | return; | |
298 | } | |
299 | i++; | |
300 | } | |
301 | /* No error ?? */ | |
302 | printk(KERN_ERR "ata%u: called with no error (%02X)!\n", qc->ap->id, drv_stat); | |
303 | /* additional-sense-code[-qualifier] */ | |
304 | ||
305 | sb[0] = 0x70; | |
306 | sb[2] = MEDIUM_ERROR; | |
307 | sb[7] = 0x0A; | |
308 | if (cmd->sc_data_direction == SCSI_DATA_READ) { | |
309 | sb[12] = 0x11; /* "unrecovered read error" */ | |
310 | sb[13] = 0x04; | |
311 | } else { | |
312 | sb[12] = 0x0C; /* "write error - */ | |
313 | sb[13] = 0x02; /* auto-reallocation failed" */ | |
314 | } | |
315 | } | |
316 | ||
317 | /** | |
318 | * ata_scsi_slave_config - Set SCSI device attributes | |
319 | * @sdev: SCSI device to examine | |
320 | * | |
321 | * This is called before we actually start reading | |
322 | * and writing to the device, to configure certain | |
323 | * SCSI mid-layer behaviors. | |
324 | * | |
325 | * LOCKING: | |
326 | * Defined by SCSI layer. We don't really care. | |
327 | */ | |
328 | ||
329 | int ata_scsi_slave_config(struct scsi_device *sdev) | |
330 | { | |
331 | sdev->use_10_for_rw = 1; | |
332 | sdev->use_10_for_ms = 1; | |
333 | ||
334 | blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD); | |
335 | ||
336 | if (sdev->id < ATA_MAX_DEVICES) { | |
337 | struct ata_port *ap; | |
338 | struct ata_device *dev; | |
339 | ||
340 | ap = (struct ata_port *) &sdev->host->hostdata[0]; | |
341 | dev = &ap->device[sdev->id]; | |
342 | ||
343 | /* TODO: 1024 is an arbitrary number, not the | |
344 | * hardware maximum. This should be increased to | |
345 | * 65534 when Jens Axboe's patch for dynamically | |
346 | * determining max_sectors is merged. | |
347 | */ | |
348 | if ((dev->flags & ATA_DFLAG_LBA48) && | |
349 | ((dev->flags & ATA_DFLAG_LOCK_SECTORS) == 0)) { | |
350 | sdev->host->max_sectors = 2048; | |
351 | blk_queue_max_sectors(sdev->request_queue, 2048); | |
352 | } | |
353 | } | |
354 | ||
355 | return 0; /* scsi layer doesn't check return value, sigh */ | |
356 | } | |
357 | ||
358 | /** | |
359 | * ata_scsi_error - SCSI layer error handler callback | |
360 | * @host: SCSI host on which error occurred | |
361 | * | |
362 | * Handles SCSI-layer-thrown error events. | |
363 | * | |
364 | * LOCKING: | |
365 | * Inherited from SCSI layer (none, can sleep) | |
366 | * | |
367 | * RETURNS: | |
368 | * Zero. | |
369 | */ | |
370 | ||
371 | int ata_scsi_error(struct Scsi_Host *host) | |
372 | { | |
373 | struct ata_port *ap; | |
374 | ||
375 | DPRINTK("ENTER\n"); | |
376 | ||
377 | ap = (struct ata_port *) &host->hostdata[0]; | |
378 | ap->ops->eng_timeout(ap); | |
379 | ||
380 | /* TODO: this is per-command; when queueing is supported | |
381 | * this code will either change or move to a more | |
382 | * appropriate place | |
383 | */ | |
384 | host->host_failed--; | |
385 | ||
386 | DPRINTK("EXIT\n"); | |
387 | return 0; | |
388 | } | |
389 | ||
390 | /** | |
391 | * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command | |
392 | * @qc: Storage for translated ATA taskfile | |
393 | * @scsicmd: SCSI command to translate (ignored) | |
394 | * | |
395 | * Sets up an ATA taskfile to issue FLUSH CACHE or | |
396 | * FLUSH CACHE EXT. | |
397 | * | |
398 | * LOCKING: | |
399 | * spin_lock_irqsave(host_set lock) | |
400 | * | |
401 | * RETURNS: | |
402 | * Zero on success, non-zero on error. | |
403 | */ | |
404 | ||
405 | static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, u8 *scsicmd) | |
406 | { | |
407 | struct ata_taskfile *tf = &qc->tf; | |
408 | ||
409 | tf->flags |= ATA_TFLAG_DEVICE; | |
410 | tf->protocol = ATA_PROT_NODATA; | |
411 | ||
412 | if ((tf->flags & ATA_TFLAG_LBA48) && | |
413 | (ata_id_has_flush_ext(qc->dev->id))) | |
414 | tf->command = ATA_CMD_FLUSH_EXT; | |
415 | else | |
416 | tf->command = ATA_CMD_FLUSH; | |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
421 | /** | |
422 | * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one | |
423 | * @qc: Storage for translated ATA taskfile | |
424 | * @scsicmd: SCSI command to translate | |
425 | * | |
426 | * Converts SCSI VERIFY command to an ATA READ VERIFY command. | |
427 | * | |
428 | * LOCKING: | |
429 | * spin_lock_irqsave(host_set lock) | |
430 | * | |
431 | * RETURNS: | |
432 | * Zero on success, non-zero on error. | |
433 | */ | |
434 | ||
435 | static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, u8 *scsicmd) | |
436 | { | |
437 | struct ata_taskfile *tf = &qc->tf; | |
438 | unsigned int lba48 = tf->flags & ATA_TFLAG_LBA48; | |
439 | u64 dev_sectors = qc->dev->n_sectors; | |
440 | u64 sect = 0; | |
441 | u32 n_sect = 0; | |
442 | ||
443 | tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
444 | tf->protocol = ATA_PROT_NODATA; | |
445 | tf->device |= ATA_LBA; | |
446 | ||
447 | if (scsicmd[0] == VERIFY) { | |
448 | sect |= ((u64)scsicmd[2]) << 24; | |
449 | sect |= ((u64)scsicmd[3]) << 16; | |
450 | sect |= ((u64)scsicmd[4]) << 8; | |
451 | sect |= ((u64)scsicmd[5]); | |
452 | ||
453 | n_sect |= ((u32)scsicmd[7]) << 8; | |
454 | n_sect |= ((u32)scsicmd[8]); | |
455 | } | |
456 | ||
457 | else if (scsicmd[0] == VERIFY_16) { | |
458 | sect |= ((u64)scsicmd[2]) << 56; | |
459 | sect |= ((u64)scsicmd[3]) << 48; | |
460 | sect |= ((u64)scsicmd[4]) << 40; | |
461 | sect |= ((u64)scsicmd[5]) << 32; | |
462 | sect |= ((u64)scsicmd[6]) << 24; | |
463 | sect |= ((u64)scsicmd[7]) << 16; | |
464 | sect |= ((u64)scsicmd[8]) << 8; | |
465 | sect |= ((u64)scsicmd[9]); | |
466 | ||
467 | n_sect |= ((u32)scsicmd[10]) << 24; | |
468 | n_sect |= ((u32)scsicmd[11]) << 16; | |
469 | n_sect |= ((u32)scsicmd[12]) << 8; | |
470 | n_sect |= ((u32)scsicmd[13]); | |
471 | } | |
472 | ||
473 | else | |
474 | return 1; | |
475 | ||
476 | if (!n_sect) | |
477 | return 1; | |
478 | if (sect >= dev_sectors) | |
479 | return 1; | |
480 | if ((sect + n_sect) > dev_sectors) | |
481 | return 1; | |
482 | if (lba48) { | |
483 | if (n_sect > (64 * 1024)) | |
484 | return 1; | |
485 | } else { | |
486 | if (n_sect > 256) | |
487 | return 1; | |
488 | } | |
489 | ||
490 | if (lba48) { | |
491 | tf->command = ATA_CMD_VERIFY_EXT; | |
492 | ||
493 | tf->hob_nsect = (n_sect >> 8) & 0xff; | |
494 | ||
495 | tf->hob_lbah = (sect >> 40) & 0xff; | |
496 | tf->hob_lbam = (sect >> 32) & 0xff; | |
497 | tf->hob_lbal = (sect >> 24) & 0xff; | |
498 | } else { | |
499 | tf->command = ATA_CMD_VERIFY; | |
500 | ||
501 | tf->device |= (sect >> 24) & 0xf; | |
502 | } | |
503 | ||
504 | tf->nsect = n_sect & 0xff; | |
505 | ||
506 | tf->lbah = (sect >> 16) & 0xff; | |
507 | tf->lbam = (sect >> 8) & 0xff; | |
508 | tf->lbal = sect & 0xff; | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | /** | |
514 | * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one | |
515 | * @qc: Storage for translated ATA taskfile | |
516 | * @scsicmd: SCSI command to translate | |
517 | * | |
518 | * Converts any of six SCSI read/write commands into the | |
519 | * ATA counterpart, including starting sector (LBA), | |
520 | * sector count, and taking into account the device's LBA48 | |
521 | * support. | |
522 | * | |
523 | * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and | |
524 | * %WRITE_16 are currently supported. | |
525 | * | |
526 | * LOCKING: | |
527 | * spin_lock_irqsave(host_set lock) | |
528 | * | |
529 | * RETURNS: | |
530 | * Zero on success, non-zero on error. | |
531 | */ | |
532 | ||
533 | static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, u8 *scsicmd) | |
534 | { | |
535 | struct ata_taskfile *tf = &qc->tf; | |
536 | unsigned int lba48 = tf->flags & ATA_TFLAG_LBA48; | |
537 | ||
538 | tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
539 | tf->protocol = qc->dev->xfer_protocol; | |
540 | tf->device |= ATA_LBA; | |
541 | ||
542 | if (scsicmd[0] == READ_10 || scsicmd[0] == READ_6 || | |
543 | scsicmd[0] == READ_16) { | |
544 | tf->command = qc->dev->read_cmd; | |
545 | } else { | |
546 | tf->command = qc->dev->write_cmd; | |
547 | tf->flags |= ATA_TFLAG_WRITE; | |
548 | } | |
549 | ||
550 | if (scsicmd[0] == READ_10 || scsicmd[0] == WRITE_10) { | |
551 | if (lba48) { | |
552 | tf->hob_nsect = scsicmd[7]; | |
553 | tf->hob_lbal = scsicmd[2]; | |
554 | ||
555 | qc->nsect = ((unsigned int)scsicmd[7] << 8) | | |
556 | scsicmd[8]; | |
557 | } else { | |
558 | /* if we don't support LBA48 addressing, the request | |
559 | * -may- be too large. */ | |
560 | if ((scsicmd[2] & 0xf0) || scsicmd[7]) | |
561 | return 1; | |
562 | ||
563 | /* stores LBA27:24 in lower 4 bits of device reg */ | |
564 | tf->device |= scsicmd[2]; | |
565 | ||
566 | qc->nsect = scsicmd[8]; | |
567 | } | |
568 | ||
569 | tf->nsect = scsicmd[8]; | |
570 | tf->lbal = scsicmd[5]; | |
571 | tf->lbam = scsicmd[4]; | |
572 | tf->lbah = scsicmd[3]; | |
573 | ||
574 | VPRINTK("ten-byte command\n"); | |
575 | return 0; | |
576 | } | |
577 | ||
578 | if (scsicmd[0] == READ_6 || scsicmd[0] == WRITE_6) { | |
579 | qc->nsect = tf->nsect = scsicmd[4]; | |
580 | tf->lbal = scsicmd[3]; | |
581 | tf->lbam = scsicmd[2]; | |
582 | tf->lbah = scsicmd[1] & 0x1f; /* mask out reserved bits */ | |
583 | ||
584 | VPRINTK("six-byte command\n"); | |
585 | return 0; | |
586 | } | |
587 | ||
588 | if (scsicmd[0] == READ_16 || scsicmd[0] == WRITE_16) { | |
589 | /* rule out impossible LBAs and sector counts */ | |
590 | if (scsicmd[2] || scsicmd[3] || scsicmd[10] || scsicmd[11]) | |
591 | return 1; | |
592 | ||
593 | if (lba48) { | |
594 | tf->hob_nsect = scsicmd[12]; | |
595 | tf->hob_lbal = scsicmd[6]; | |
596 | tf->hob_lbam = scsicmd[5]; | |
597 | tf->hob_lbah = scsicmd[4]; | |
598 | ||
599 | qc->nsect = ((unsigned int)scsicmd[12] << 8) | | |
600 | scsicmd[13]; | |
601 | } else { | |
602 | /* once again, filter out impossible non-zero values */ | |
603 | if (scsicmd[4] || scsicmd[5] || scsicmd[12] || | |
604 | (scsicmd[6] & 0xf0)) | |
605 | return 1; | |
606 | ||
607 | /* stores LBA27:24 in lower 4 bits of device reg */ | |
608 | tf->device |= scsicmd[6]; | |
609 | ||
610 | qc->nsect = scsicmd[13]; | |
611 | } | |
612 | ||
613 | tf->nsect = scsicmd[13]; | |
614 | tf->lbal = scsicmd[9]; | |
615 | tf->lbam = scsicmd[8]; | |
616 | tf->lbah = scsicmd[7]; | |
617 | ||
618 | VPRINTK("sixteen-byte command\n"); | |
619 | return 0; | |
620 | } | |
621 | ||
622 | DPRINTK("no-byte command\n"); | |
623 | return 1; | |
624 | } | |
625 | ||
626 | static int ata_scsi_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat) | |
627 | { | |
628 | struct scsi_cmnd *cmd = qc->scsicmd; | |
629 | ||
630 | if (unlikely(drv_stat & (ATA_ERR | ATA_BUSY | ATA_DRQ))) | |
631 | ata_to_sense_error(qc, drv_stat); | |
632 | else | |
633 | cmd->result = SAM_STAT_GOOD; | |
634 | ||
635 | qc->scsidone(cmd); | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
640 | /** | |
641 | * ata_scsi_translate - Translate then issue SCSI command to ATA device | |
642 | * @ap: ATA port to which the command is addressed | |
643 | * @dev: ATA device to which the command is addressed | |
644 | * @cmd: SCSI command to execute | |
645 | * @done: SCSI command completion function | |
646 | * @xlat_func: Actor which translates @cmd to an ATA taskfile | |
647 | * | |
648 | * Our ->queuecommand() function has decided that the SCSI | |
649 | * command issued can be directly translated into an ATA | |
650 | * command, rather than handled internally. | |
651 | * | |
652 | * This function sets up an ata_queued_cmd structure for the | |
653 | * SCSI command, and sends that ata_queued_cmd to the hardware. | |
654 | * | |
655 | * LOCKING: | |
656 | * spin_lock_irqsave(host_set lock) | |
657 | */ | |
658 | ||
659 | static void ata_scsi_translate(struct ata_port *ap, struct ata_device *dev, | |
660 | struct scsi_cmnd *cmd, | |
661 | void (*done)(struct scsi_cmnd *), | |
662 | ata_xlat_func_t xlat_func) | |
663 | { | |
664 | struct ata_queued_cmd *qc; | |
665 | u8 *scsicmd = cmd->cmnd; | |
666 | ||
667 | VPRINTK("ENTER\n"); | |
668 | ||
669 | qc = ata_scsi_qc_new(ap, dev, cmd, done); | |
670 | if (!qc) | |
671 | return; | |
672 | ||
673 | /* data is present; dma-map it */ | |
674 | if (cmd->sc_data_direction == SCSI_DATA_READ || | |
675 | cmd->sc_data_direction == SCSI_DATA_WRITE) { | |
676 | if (unlikely(cmd->request_bufflen < 1)) { | |
677 | printk(KERN_WARNING "ata%u(%u): WARNING: zero len r/w req\n", | |
678 | ap->id, dev->devno); | |
679 | goto err_out; | |
680 | } | |
681 | ||
682 | if (cmd->use_sg) | |
683 | ata_sg_init(qc, cmd->request_buffer, cmd->use_sg); | |
684 | else | |
685 | ata_sg_init_one(qc, cmd->request_buffer, | |
686 | cmd->request_bufflen); | |
687 | ||
688 | qc->dma_dir = cmd->sc_data_direction; | |
689 | } | |
690 | ||
691 | qc->complete_fn = ata_scsi_qc_complete; | |
692 | ||
693 | if (xlat_func(qc, scsicmd)) | |
694 | goto err_out; | |
695 | ||
696 | /* select device, send command to hardware */ | |
697 | if (ata_qc_issue(qc)) | |
698 | goto err_out; | |
699 | ||
700 | VPRINTK("EXIT\n"); | |
701 | return; | |
702 | ||
703 | err_out: | |
704 | ata_qc_free(qc); | |
705 | ata_bad_cdb(cmd, done); | |
706 | DPRINTK("EXIT - badcmd\n"); | |
707 | } | |
708 | ||
709 | /** | |
710 | * ata_scsi_rbuf_get - Map response buffer. | |
711 | * @cmd: SCSI command containing buffer to be mapped. | |
712 | * @buf_out: Pointer to mapped area. | |
713 | * | |
714 | * Maps buffer contained within SCSI command @cmd. | |
715 | * | |
716 | * LOCKING: | |
717 | * spin_lock_irqsave(host_set lock) | |
718 | * | |
719 | * RETURNS: | |
720 | * Length of response buffer. | |
721 | */ | |
722 | ||
723 | static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out) | |
724 | { | |
725 | u8 *buf; | |
726 | unsigned int buflen; | |
727 | ||
728 | if (cmd->use_sg) { | |
729 | struct scatterlist *sg; | |
730 | ||
731 | sg = (struct scatterlist *) cmd->request_buffer; | |
732 | buf = kmap_atomic(sg->page, KM_USER0) + sg->offset; | |
733 | buflen = sg->length; | |
734 | } else { | |
735 | buf = cmd->request_buffer; | |
736 | buflen = cmd->request_bufflen; | |
737 | } | |
738 | ||
739 | *buf_out = buf; | |
740 | return buflen; | |
741 | } | |
742 | ||
743 | /** | |
744 | * ata_scsi_rbuf_put - Unmap response buffer. | |
745 | * @cmd: SCSI command containing buffer to be unmapped. | |
746 | * @buf: buffer to unmap | |
747 | * | |
748 | * Unmaps response buffer contained within @cmd. | |
749 | * | |
750 | * LOCKING: | |
751 | * spin_lock_irqsave(host_set lock) | |
752 | */ | |
753 | ||
754 | static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf) | |
755 | { | |
756 | if (cmd->use_sg) { | |
757 | struct scatterlist *sg; | |
758 | ||
759 | sg = (struct scatterlist *) cmd->request_buffer; | |
760 | kunmap_atomic(buf - sg->offset, KM_USER0); | |
761 | } | |
762 | } | |
763 | ||
764 | /** | |
765 | * ata_scsi_rbuf_fill - wrapper for SCSI command simulators | |
766 | * @args: device IDENTIFY data / SCSI command of interest. | |
767 | * @actor: Callback hook for desired SCSI command simulator | |
768 | * | |
769 | * Takes care of the hard work of simulating a SCSI command... | |
770 | * Mapping the response buffer, calling the command's handler, | |
771 | * and handling the handler's return value. This return value | |
772 | * indicates whether the handler wishes the SCSI command to be | |
773 | * completed successfully, or not. | |
774 | * | |
775 | * LOCKING: | |
776 | * spin_lock_irqsave(host_set lock) | |
777 | */ | |
778 | ||
779 | void ata_scsi_rbuf_fill(struct ata_scsi_args *args, | |
780 | unsigned int (*actor) (struct ata_scsi_args *args, | |
781 | u8 *rbuf, unsigned int buflen)) | |
782 | { | |
783 | u8 *rbuf; | |
784 | unsigned int buflen, rc; | |
785 | struct scsi_cmnd *cmd = args->cmd; | |
786 | ||
787 | buflen = ata_scsi_rbuf_get(cmd, &rbuf); | |
788 | memset(rbuf, 0, buflen); | |
789 | rc = actor(args, rbuf, buflen); | |
790 | ata_scsi_rbuf_put(cmd, rbuf); | |
791 | ||
792 | if (rc) | |
793 | ata_bad_cdb(cmd, args->done); | |
794 | else { | |
795 | cmd->result = SAM_STAT_GOOD; | |
796 | args->done(cmd); | |
797 | } | |
798 | } | |
799 | ||
800 | /** | |
801 | * ata_scsiop_inq_std - Simulate INQUIRY command | |
802 | * @args: device IDENTIFY data / SCSI command of interest. | |
803 | * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. | |
804 | * @buflen: Response buffer length. | |
805 | * | |
806 | * Returns standard device identification data associated | |
807 | * with non-EVPD INQUIRY command output. | |
808 | * | |
809 | * LOCKING: | |
810 | * spin_lock_irqsave(host_set lock) | |
811 | */ | |
812 | ||
813 | unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf, | |
814 | unsigned int buflen) | |
815 | { | |
816 | u8 hdr[] = { | |
817 | TYPE_DISK, | |
818 | 0, | |
819 | 0x5, /* claim SPC-3 version compatibility */ | |
820 | 2, | |
821 | 95 - 4 | |
822 | }; | |
823 | ||
824 | /* set scsi removeable (RMB) bit per ata bit */ | |
825 | if (ata_id_removeable(args->id)) | |
826 | hdr[1] |= (1 << 7); | |
827 | ||
828 | VPRINTK("ENTER\n"); | |
829 | ||
830 | memcpy(rbuf, hdr, sizeof(hdr)); | |
831 | ||
832 | if (buflen > 35) { | |
833 | memcpy(&rbuf[8], "ATA ", 8); | |
834 | ata_dev_id_string(args->id, &rbuf[16], ATA_ID_PROD_OFS, 16); | |
835 | ata_dev_id_string(args->id, &rbuf[32], ATA_ID_FW_REV_OFS, 4); | |
836 | if (rbuf[32] == 0 || rbuf[32] == ' ') | |
837 | memcpy(&rbuf[32], "n/a ", 4); | |
838 | } | |
839 | ||
840 | if (buflen > 63) { | |
841 | const u8 versions[] = { | |
842 | 0x60, /* SAM-3 (no version claimed) */ | |
843 | ||
844 | 0x03, | |
845 | 0x20, /* SBC-2 (no version claimed) */ | |
846 | ||
847 | 0x02, | |
848 | 0x60 /* SPC-3 (no version claimed) */ | |
849 | }; | |
850 | ||
851 | memcpy(rbuf + 59, versions, sizeof(versions)); | |
852 | } | |
853 | ||
854 | return 0; | |
855 | } | |
856 | ||
857 | /** | |
858 | * ata_scsiop_inq_00 - Simulate INQUIRY EVPD page 0, list of pages | |
859 | * @args: device IDENTIFY data / SCSI command of interest. | |
860 | * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. | |
861 | * @buflen: Response buffer length. | |
862 | * | |
863 | * Returns list of inquiry EVPD pages available. | |
864 | * | |
865 | * LOCKING: | |
866 | * spin_lock_irqsave(host_set lock) | |
867 | */ | |
868 | ||
869 | unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf, | |
870 | unsigned int buflen) | |
871 | { | |
872 | const u8 pages[] = { | |
873 | 0x00, /* page 0x00, this page */ | |
874 | 0x80, /* page 0x80, unit serial no page */ | |
875 | 0x83 /* page 0x83, device ident page */ | |
876 | }; | |
877 | rbuf[3] = sizeof(pages); /* number of supported EVPD pages */ | |
878 | ||
879 | if (buflen > 6) | |
880 | memcpy(rbuf + 4, pages, sizeof(pages)); | |
881 | ||
882 | return 0; | |
883 | } | |
884 | ||
885 | /** | |
886 | * ata_scsiop_inq_80 - Simulate INQUIRY EVPD page 80, device serial number | |
887 | * @args: device IDENTIFY data / SCSI command of interest. | |
888 | * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. | |
889 | * @buflen: Response buffer length. | |
890 | * | |
891 | * Returns ATA device serial number. | |
892 | * | |
893 | * LOCKING: | |
894 | * spin_lock_irqsave(host_set lock) | |
895 | */ | |
896 | ||
897 | unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf, | |
898 | unsigned int buflen) | |
899 | { | |
900 | const u8 hdr[] = { | |
901 | 0, | |
902 | 0x80, /* this page code */ | |
903 | 0, | |
904 | ATA_SERNO_LEN, /* page len */ | |
905 | }; | |
906 | memcpy(rbuf, hdr, sizeof(hdr)); | |
907 | ||
908 | if (buflen > (ATA_SERNO_LEN + 4 - 1)) | |
909 | ata_dev_id_string(args->id, (unsigned char *) &rbuf[4], | |
910 | ATA_ID_SERNO_OFS, ATA_SERNO_LEN); | |
911 | ||
912 | return 0; | |
913 | } | |
914 | ||
915 | static const char *inq_83_str = "Linux ATA-SCSI simulator"; | |
916 | ||
917 | /** | |
918 | * ata_scsiop_inq_83 - Simulate INQUIRY EVPD page 83, device identity | |
919 | * @args: device IDENTIFY data / SCSI command of interest. | |
920 | * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. | |
921 | * @buflen: Response buffer length. | |
922 | * | |
923 | * Returns device identification. Currently hardcoded to | |
924 | * return "Linux ATA-SCSI simulator". | |
925 | * | |
926 | * LOCKING: | |
927 | * spin_lock_irqsave(host_set lock) | |
928 | */ | |
929 | ||
930 | unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf, | |
931 | unsigned int buflen) | |
932 | { | |
933 | rbuf[1] = 0x83; /* this page code */ | |
934 | rbuf[3] = 4 + strlen(inq_83_str); /* page len */ | |
935 | ||
936 | /* our one and only identification descriptor (vendor-specific) */ | |
937 | if (buflen > (strlen(inq_83_str) + 4 + 4 - 1)) { | |
938 | rbuf[4 + 0] = 2; /* code set: ASCII */ | |
939 | rbuf[4 + 3] = strlen(inq_83_str); | |
940 | memcpy(rbuf + 4 + 4, inq_83_str, strlen(inq_83_str)); | |
941 | } | |
942 | ||
943 | return 0; | |
944 | } | |
945 | ||
946 | /** | |
947 | * ata_scsiop_noop - | |
948 | * @args: device IDENTIFY data / SCSI command of interest. | |
949 | * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. | |
950 | * @buflen: Response buffer length. | |
951 | * | |
952 | * No operation. Simply returns success to caller, to indicate | |
953 | * that the caller should successfully complete this SCSI command. | |
954 | * | |
955 | * LOCKING: | |
956 | * spin_lock_irqsave(host_set lock) | |
957 | */ | |
958 | ||
959 | unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf, | |
960 | unsigned int buflen) | |
961 | { | |
962 | VPRINTK("ENTER\n"); | |
963 | return 0; | |
964 | } | |
965 | ||
966 | /** | |
967 | * ata_msense_push - Push data onto MODE SENSE data output buffer | |
968 | * @ptr_io: (input/output) Location to store more output data | |
969 | * @last: End of output data buffer | |
970 | * @buf: Pointer to BLOB being added to output buffer | |
971 | * @buflen: Length of BLOB | |
972 | * | |
973 | * Store MODE SENSE data on an output buffer. | |
974 | * | |
975 | * LOCKING: | |
976 | * None. | |
977 | */ | |
978 | ||
979 | static void ata_msense_push(u8 **ptr_io, const u8 *last, | |
980 | const u8 *buf, unsigned int buflen) | |
981 | { | |
982 | u8 *ptr = *ptr_io; | |
983 | ||
984 | if ((ptr + buflen - 1) > last) | |
985 | return; | |
986 | ||
987 | memcpy(ptr, buf, buflen); | |
988 | ||
989 | ptr += buflen; | |
990 | ||
991 | *ptr_io = ptr; | |
992 | } | |
993 | ||
994 | /** | |
995 | * ata_msense_caching - Simulate MODE SENSE caching info page | |
996 | * @id: device IDENTIFY data | |
997 | * @ptr_io: (input/output) Location to store more output data | |
998 | * @last: End of output data buffer | |
999 | * | |
1000 | * Generate a caching info page, which conditionally indicates | |
1001 | * write caching to the SCSI layer, depending on device | |
1002 | * capabilities. | |
1003 | * | |
1004 | * LOCKING: | |
1005 | * None. | |
1006 | */ | |
1007 | ||
1008 | static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io, | |
1009 | const u8 *last) | |
1010 | { | |
1011 | u8 page[] = { | |
1012 | 0x8, /* page code */ | |
1013 | 0x12, /* page length */ | |
1014 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 10 zeroes */ | |
1015 | 0, 0, 0, 0, 0, 0, 0, 0 /* 8 zeroes */ | |
1016 | }; | |
1017 | ||
1018 | if (ata_id_wcache_enabled(id)) | |
1019 | page[2] |= (1 << 2); /* write cache enable */ | |
1020 | if (!ata_id_rahead_enabled(id)) | |
1021 | page[12] |= (1 << 5); /* disable read ahead */ | |
1022 | ||
1023 | ata_msense_push(ptr_io, last, page, sizeof(page)); | |
1024 | return sizeof(page); | |
1025 | } | |
1026 | ||
1027 | /** | |
1028 | * ata_msense_ctl_mode - Simulate MODE SENSE control mode page | |
1029 | * @dev: Device associated with this MODE SENSE command | |
1030 | * @ptr_io: (input/output) Location to store more output data | |
1031 | * @last: End of output data buffer | |
1032 | * | |
1033 | * Generate a generic MODE SENSE control mode page. | |
1034 | * | |
1035 | * LOCKING: | |
1036 | * None. | |
1037 | */ | |
1038 | ||
1039 | static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last) | |
1040 | { | |
1041 | const u8 page[] = {0xa, 0xa, 6, 0, 0, 0, 0, 0, 0xff, 0xff, 0, 30}; | |
1042 | ||
1043 | /* byte 2: set the descriptor format sense data bit (bit 2) | |
1044 | * since we need to support returning this format for SAT | |
1045 | * commands and any SCSI commands against a 48b LBA device. | |
1046 | */ | |
1047 | ||
1048 | ata_msense_push(ptr_io, last, page, sizeof(page)); | |
1049 | return sizeof(page); | |
1050 | } | |
1051 | ||
1052 | /** | |
1053 | * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page | |
1054 | * @dev: Device associated with this MODE SENSE command | |
1055 | * @ptr_io: (input/output) Location to store more output data | |
1056 | * @last: End of output data buffer | |
1057 | * | |
1058 | * Generate a generic MODE SENSE r/w error recovery page. | |
1059 | * | |
1060 | * LOCKING: | |
1061 | * None. | |
1062 | */ | |
1063 | ||
1064 | static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last) | |
1065 | { | |
1066 | const u8 page[] = { | |
1067 | 0x1, /* page code */ | |
1068 | 0xa, /* page length */ | |
1069 | (1 << 7) | (1 << 6), /* note auto r/w reallocation */ | |
1070 | 0, 0, 0, 0, 0, 0, 0, 0, 0 /* 9 zeroes */ | |
1071 | }; | |
1072 | ||
1073 | ata_msense_push(ptr_io, last, page, sizeof(page)); | |
1074 | return sizeof(page); | |
1075 | } | |
1076 | ||
1077 | /** | |
1078 | * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands | |
1079 | * @args: device IDENTIFY data / SCSI command of interest. | |
1080 | * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. | |
1081 | * @buflen: Response buffer length. | |
1082 | * | |
1083 | * Simulate MODE SENSE commands. | |
1084 | * | |
1085 | * LOCKING: | |
1086 | * spin_lock_irqsave(host_set lock) | |
1087 | */ | |
1088 | ||
1089 | unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf, | |
1090 | unsigned int buflen) | |
1091 | { | |
1092 | u8 *scsicmd = args->cmd->cmnd, *p, *last; | |
1093 | unsigned int page_control, six_byte, output_len; | |
1094 | ||
1095 | VPRINTK("ENTER\n"); | |
1096 | ||
1097 | six_byte = (scsicmd[0] == MODE_SENSE); | |
1098 | ||
1099 | /* we only support saved and current values (which we treat | |
1100 | * in the same manner) | |
1101 | */ | |
1102 | page_control = scsicmd[2] >> 6; | |
1103 | if ((page_control != 0) && (page_control != 3)) | |
1104 | return 1; | |
1105 | ||
1106 | if (six_byte) | |
1107 | output_len = 4; | |
1108 | else | |
1109 | output_len = 8; | |
1110 | ||
1111 | p = rbuf + output_len; | |
1112 | last = rbuf + buflen - 1; | |
1113 | ||
1114 | switch(scsicmd[2] & 0x3f) { | |
1115 | case 0x01: /* r/w error recovery */ | |
1116 | output_len += ata_msense_rw_recovery(&p, last); | |
1117 | break; | |
1118 | ||
1119 | case 0x08: /* caching */ | |
1120 | output_len += ata_msense_caching(args->id, &p, last); | |
1121 | break; | |
1122 | ||
1123 | case 0x0a: { /* control mode */ | |
1124 | output_len += ata_msense_ctl_mode(&p, last); | |
1125 | break; | |
1126 | } | |
1127 | ||
1128 | case 0x3f: /* all pages */ | |
1129 | output_len += ata_msense_rw_recovery(&p, last); | |
1130 | output_len += ata_msense_caching(args->id, &p, last); | |
1131 | output_len += ata_msense_ctl_mode(&p, last); | |
1132 | break; | |
1133 | ||
1134 | default: /* invalid page code */ | |
1135 | return 1; | |
1136 | } | |
1137 | ||
1138 | if (six_byte) { | |
1139 | output_len--; | |
1140 | rbuf[0] = output_len; | |
1141 | } else { | |
1142 | output_len -= 2; | |
1143 | rbuf[0] = output_len >> 8; | |
1144 | rbuf[1] = output_len; | |
1145 | } | |
1146 | ||
1147 | return 0; | |
1148 | } | |
1149 | ||
1150 | /** | |
1151 | * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands | |
1152 | * @args: device IDENTIFY data / SCSI command of interest. | |
1153 | * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. | |
1154 | * @buflen: Response buffer length. | |
1155 | * | |
1156 | * Simulate READ CAPACITY commands. | |
1157 | * | |
1158 | * LOCKING: | |
1159 | * spin_lock_irqsave(host_set lock) | |
1160 | */ | |
1161 | ||
1162 | unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf, | |
1163 | unsigned int buflen) | |
1164 | { | |
1165 | u64 n_sectors; | |
1166 | u32 tmp; | |
1167 | ||
1168 | VPRINTK("ENTER\n"); | |
1169 | ||
1170 | if (ata_id_has_lba48(args->id)) | |
1171 | n_sectors = ata_id_u64(args->id, 100); | |
1172 | else | |
1173 | n_sectors = ata_id_u32(args->id, 60); | |
1174 | n_sectors--; /* ATA TotalUserSectors - 1 */ | |
1175 | ||
1176 | tmp = n_sectors; /* note: truncates, if lba48 */ | |
1177 | if (args->cmd->cmnd[0] == READ_CAPACITY) { | |
1178 | /* sector count, 32-bit */ | |
1179 | rbuf[0] = tmp >> (8 * 3); | |
1180 | rbuf[1] = tmp >> (8 * 2); | |
1181 | rbuf[2] = tmp >> (8 * 1); | |
1182 | rbuf[3] = tmp; | |
1183 | ||
1184 | /* sector size */ | |
1185 | tmp = ATA_SECT_SIZE; | |
1186 | rbuf[6] = tmp >> 8; | |
1187 | rbuf[7] = tmp; | |
1188 | ||
1189 | } else { | |
1190 | /* sector count, 64-bit */ | |
1191 | rbuf[2] = n_sectors >> (8 * 7); | |
1192 | rbuf[3] = n_sectors >> (8 * 6); | |
1193 | rbuf[4] = n_sectors >> (8 * 5); | |
1194 | rbuf[5] = n_sectors >> (8 * 4); | |
1195 | rbuf[6] = tmp >> (8 * 3); | |
1196 | rbuf[7] = tmp >> (8 * 2); | |
1197 | rbuf[8] = tmp >> (8 * 1); | |
1198 | rbuf[9] = tmp; | |
1199 | ||
1200 | /* sector size */ | |
1201 | tmp = ATA_SECT_SIZE; | |
1202 | rbuf[12] = tmp >> 8; | |
1203 | rbuf[13] = tmp; | |
1204 | } | |
1205 | ||
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | /** | |
1210 | * ata_scsiop_report_luns - Simulate REPORT LUNS command | |
1211 | * @args: device IDENTIFY data / SCSI command of interest. | |
1212 | * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. | |
1213 | * @buflen: Response buffer length. | |
1214 | * | |
1215 | * Simulate REPORT LUNS command. | |
1216 | * | |
1217 | * LOCKING: | |
1218 | * spin_lock_irqsave(host_set lock) | |
1219 | */ | |
1220 | ||
1221 | unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf, | |
1222 | unsigned int buflen) | |
1223 | { | |
1224 | VPRINTK("ENTER\n"); | |
1225 | rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ | |
1226 | ||
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | /** | |
1231 | * ata_scsi_badcmd - End a SCSI request with an error | |
1232 | * @cmd: SCSI request to be handled | |
1233 | * @done: SCSI command completion function | |
1234 | * @asc: SCSI-defined additional sense code | |
1235 | * @ascq: SCSI-defined additional sense code qualifier | |
1236 | * | |
1237 | * Helper function that completes a SCSI command with | |
1238 | * %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST | |
1239 | * and the specified additional sense codes. | |
1240 | * | |
1241 | * LOCKING: | |
1242 | * spin_lock_irqsave(host_set lock) | |
1243 | */ | |
1244 | ||
1245 | void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq) | |
1246 | { | |
1247 | DPRINTK("ENTER\n"); | |
1248 | cmd->result = SAM_STAT_CHECK_CONDITION; | |
1249 | ||
1250 | cmd->sense_buffer[0] = 0x70; | |
1251 | cmd->sense_buffer[2] = ILLEGAL_REQUEST; | |
1252 | cmd->sense_buffer[7] = 14 - 8; /* addnl. sense len. FIXME: correct? */ | |
1253 | cmd->sense_buffer[12] = asc; | |
1254 | cmd->sense_buffer[13] = ascq; | |
1255 | ||
1256 | done(cmd); | |
1257 | } | |
1258 | ||
1259 | static int atapi_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat) | |
1260 | { | |
1261 | struct scsi_cmnd *cmd = qc->scsicmd; | |
1262 | ||
1263 | if (unlikely(drv_stat & (ATA_ERR | ATA_BUSY | ATA_DRQ))) { | |
1264 | DPRINTK("request check condition\n"); | |
1265 | ||
1266 | cmd->result = SAM_STAT_CHECK_CONDITION; | |
1267 | ||
1268 | qc->scsidone(cmd); | |
1269 | ||
1270 | return 1; | |
1271 | } else { | |
1272 | u8 *scsicmd = cmd->cmnd; | |
1273 | ||
1274 | if (scsicmd[0] == INQUIRY) { | |
1275 | u8 *buf = NULL; | |
1276 | unsigned int buflen; | |
1277 | ||
1278 | buflen = ata_scsi_rbuf_get(cmd, &buf); | |
1279 | buf[2] = 0x5; | |
1280 | buf[3] = (buf[3] & 0xf0) | 2; | |
1281 | ata_scsi_rbuf_put(cmd, buf); | |
1282 | } | |
1283 | cmd->result = SAM_STAT_GOOD; | |
1284 | } | |
1285 | ||
1286 | qc->scsidone(cmd); | |
1287 | ||
1288 | return 0; | |
1289 | } | |
1290 | /** | |
1291 | * atapi_xlat - Initialize PACKET taskfile | |
1292 | * @qc: command structure to be initialized | |
1293 | * @scsicmd: SCSI CDB associated with this PACKET command | |
1294 | * | |
1295 | * LOCKING: | |
1296 | * spin_lock_irqsave(host_set lock) | |
1297 | * | |
1298 | * RETURNS: | |
1299 | * Zero on success, non-zero on failure. | |
1300 | */ | |
1301 | ||
1302 | static unsigned int atapi_xlat(struct ata_queued_cmd *qc, u8 *scsicmd) | |
1303 | { | |
1304 | struct scsi_cmnd *cmd = qc->scsicmd; | |
1305 | struct ata_device *dev = qc->dev; | |
1306 | int using_pio = (dev->flags & ATA_DFLAG_PIO); | |
1307 | int nodata = (cmd->sc_data_direction == SCSI_DATA_NONE); | |
1308 | ||
1309 | if (!using_pio) | |
1310 | /* Check whether ATAPI DMA is safe */ | |
1311 | if (ata_check_atapi_dma(qc)) | |
1312 | using_pio = 1; | |
1313 | ||
1314 | memcpy(&qc->cdb, scsicmd, qc->ap->cdb_len); | |
1315 | ||
1316 | qc->complete_fn = atapi_qc_complete; | |
1317 | ||
1318 | qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
1319 | if (cmd->sc_data_direction == SCSI_DATA_WRITE) { | |
1320 | qc->tf.flags |= ATA_TFLAG_WRITE; | |
1321 | DPRINTK("direction: write\n"); | |
1322 | } | |
1323 | ||
1324 | qc->tf.command = ATA_CMD_PACKET; | |
1325 | ||
1326 | /* no data, or PIO data xfer */ | |
1327 | if (using_pio || nodata) { | |
1328 | if (nodata) | |
1329 | qc->tf.protocol = ATA_PROT_ATAPI_NODATA; | |
1330 | else | |
1331 | qc->tf.protocol = ATA_PROT_ATAPI; | |
1332 | qc->tf.lbam = (8 * 1024) & 0xff; | |
1333 | qc->tf.lbah = (8 * 1024) >> 8; | |
1334 | } | |
1335 | ||
1336 | /* DMA data xfer */ | |
1337 | else { | |
1338 | qc->tf.protocol = ATA_PROT_ATAPI_DMA; | |
1339 | qc->tf.feature |= ATAPI_PKT_DMA; | |
1340 | ||
1341 | #ifdef ATAPI_ENABLE_DMADIR | |
1342 | /* some SATA bridges need us to indicate data xfer direction */ | |
1343 | if (cmd->sc_data_direction != SCSI_DATA_WRITE) | |
1344 | qc->tf.feature |= ATAPI_DMADIR; | |
1345 | #endif | |
1346 | } | |
1347 | ||
1348 | qc->nbytes = cmd->bufflen; | |
1349 | ||
1350 | return 0; | |
1351 | } | |
1352 | ||
1353 | /** | |
1354 | * ata_scsi_find_dev - lookup ata_device from scsi_cmnd | |
1355 | * @ap: ATA port to which the device is attached | |
1356 | * @scsidev: SCSI device from which we derive the ATA device | |
1357 | * | |
1358 | * Given various information provided in struct scsi_cmnd, | |
1359 | * map that onto an ATA bus, and using that mapping | |
1360 | * determine which ata_device is associated with the | |
1361 | * SCSI command to be sent. | |
1362 | * | |
1363 | * LOCKING: | |
1364 | * spin_lock_irqsave(host_set lock) | |
1365 | * | |
1366 | * RETURNS: | |
1367 | * Associated ATA device, or %NULL if not found. | |
1368 | */ | |
1369 | ||
1370 | static struct ata_device * | |
1371 | ata_scsi_find_dev(struct ata_port *ap, struct scsi_device *scsidev) | |
1372 | { | |
1373 | struct ata_device *dev; | |
1374 | ||
1375 | /* skip commands not addressed to targets we simulate */ | |
1376 | if (likely(scsidev->id < ATA_MAX_DEVICES)) | |
1377 | dev = &ap->device[scsidev->id]; | |
1378 | else | |
1379 | return NULL; | |
1380 | ||
1381 | if (unlikely((scsidev->channel != 0) || | |
1382 | (scsidev->lun != 0))) | |
1383 | return NULL; | |
1384 | ||
1385 | if (unlikely(!ata_dev_present(dev))) | |
1386 | return NULL; | |
1387 | ||
1388 | #ifndef ATA_ENABLE_ATAPI | |
1389 | if (unlikely(dev->class == ATA_DEV_ATAPI)) | |
1390 | return NULL; | |
1391 | #endif | |
1392 | ||
1393 | return dev; | |
1394 | } | |
1395 | ||
1396 | /** | |
1397 | * ata_get_xlat_func - check if SCSI to ATA translation is possible | |
1398 | * @dev: ATA device | |
1399 | * @cmd: SCSI command opcode to consider | |
1400 | * | |
1401 | * Look up the SCSI command given, and determine whether the | |
1402 | * SCSI command is to be translated or simulated. | |
1403 | * | |
1404 | * RETURNS: | |
1405 | * Pointer to translation function if possible, %NULL if not. | |
1406 | */ | |
1407 | ||
1408 | static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) | |
1409 | { | |
1410 | switch (cmd) { | |
1411 | case READ_6: | |
1412 | case READ_10: | |
1413 | case READ_16: | |
1414 | ||
1415 | case WRITE_6: | |
1416 | case WRITE_10: | |
1417 | case WRITE_16: | |
1418 | return ata_scsi_rw_xlat; | |
1419 | ||
1420 | case SYNCHRONIZE_CACHE: | |
1421 | if (ata_try_flush_cache(dev)) | |
1422 | return ata_scsi_flush_xlat; | |
1423 | break; | |
1424 | ||
1425 | case VERIFY: | |
1426 | case VERIFY_16: | |
1427 | return ata_scsi_verify_xlat; | |
1428 | } | |
1429 | ||
1430 | return NULL; | |
1431 | } | |
1432 | ||
1433 | /** | |
1434 | * ata_scsi_dump_cdb - dump SCSI command contents to dmesg | |
1435 | * @ap: ATA port to which the command was being sent | |
1436 | * @cmd: SCSI command to dump | |
1437 | * | |
1438 | * Prints the contents of a SCSI command via printk(). | |
1439 | */ | |
1440 | ||
1441 | static inline void ata_scsi_dump_cdb(struct ata_port *ap, | |
1442 | struct scsi_cmnd *cmd) | |
1443 | { | |
1444 | #ifdef ATA_DEBUG | |
1445 | struct scsi_device *scsidev = cmd->device; | |
1446 | u8 *scsicmd = cmd->cmnd; | |
1447 | ||
1448 | DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", | |
1449 | ap->id, | |
1450 | scsidev->channel, scsidev->id, scsidev->lun, | |
1451 | scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3], | |
1452 | scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7], | |
1453 | scsicmd[8]); | |
1454 | #endif | |
1455 | } | |
1456 | ||
1457 | /** | |
1458 | * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device | |
1459 | * @cmd: SCSI command to be sent | |
1460 | * @done: Completion function, called when command is complete | |
1461 | * | |
1462 | * In some cases, this function translates SCSI commands into | |
1463 | * ATA taskfiles, and queues the taskfiles to be sent to | |
1464 | * hardware. In other cases, this function simulates a | |
1465 | * SCSI device by evaluating and responding to certain | |
1466 | * SCSI commands. This creates the overall effect of | |
1467 | * ATA and ATAPI devices appearing as SCSI devices. | |
1468 | * | |
1469 | * LOCKING: | |
1470 | * Releases scsi-layer-held lock, and obtains host_set lock. | |
1471 | * | |
1472 | * RETURNS: | |
1473 | * Zero. | |
1474 | */ | |
1475 | ||
1476 | int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) | |
1477 | { | |
1478 | struct ata_port *ap; | |
1479 | struct ata_device *dev; | |
1480 | struct scsi_device *scsidev = cmd->device; | |
1481 | ||
1482 | ap = (struct ata_port *) &scsidev->host->hostdata[0]; | |
1483 | ||
1484 | ata_scsi_dump_cdb(ap, cmd); | |
1485 | ||
1486 | dev = ata_scsi_find_dev(ap, scsidev); | |
1487 | if (unlikely(!dev)) { | |
1488 | cmd->result = (DID_BAD_TARGET << 16); | |
1489 | done(cmd); | |
1490 | goto out_unlock; | |
1491 | } | |
1492 | ||
1493 | if (dev->class == ATA_DEV_ATA) { | |
1494 | ata_xlat_func_t xlat_func = ata_get_xlat_func(dev, | |
1495 | cmd->cmnd[0]); | |
1496 | ||
1497 | if (xlat_func) | |
1498 | ata_scsi_translate(ap, dev, cmd, done, xlat_func); | |
1499 | else | |
1500 | ata_scsi_simulate(dev->id, cmd, done); | |
1501 | } else | |
1502 | ata_scsi_translate(ap, dev, cmd, done, atapi_xlat); | |
1503 | ||
1504 | out_unlock: | |
1505 | return 0; | |
1506 | } | |
1507 | ||
1508 | /** | |
1509 | * ata_scsi_simulate - simulate SCSI command on ATA device | |
1510 | * @id: current IDENTIFY data for target device. | |
1511 | * @cmd: SCSI command being sent to device. | |
1512 | * @done: SCSI command completion function. | |
1513 | * | |
1514 | * Interprets and directly executes a select list of SCSI commands | |
1515 | * that can be handled internally. | |
1516 | * | |
1517 | * LOCKING: | |
1518 | * spin_lock_irqsave(host_set lock) | |
1519 | */ | |
1520 | ||
1521 | void ata_scsi_simulate(u16 *id, | |
1522 | struct scsi_cmnd *cmd, | |
1523 | void (*done)(struct scsi_cmnd *)) | |
1524 | { | |
1525 | struct ata_scsi_args args; | |
1526 | u8 *scsicmd = cmd->cmnd; | |
1527 | ||
1528 | args.id = id; | |
1529 | args.cmd = cmd; | |
1530 | args.done = done; | |
1531 | ||
1532 | switch(scsicmd[0]) { | |
1533 | /* no-op's, complete with success */ | |
1534 | case SYNCHRONIZE_CACHE: | |
1535 | case REZERO_UNIT: | |
1536 | case SEEK_6: | |
1537 | case SEEK_10: | |
1538 | case TEST_UNIT_READY: | |
1539 | case FORMAT_UNIT: /* FIXME: correct? */ | |
1540 | case SEND_DIAGNOSTIC: /* FIXME: correct? */ | |
1541 | ata_scsi_rbuf_fill(&args, ata_scsiop_noop); | |
1542 | break; | |
1543 | ||
1544 | case INQUIRY: | |
1545 | if (scsicmd[1] & 2) /* is CmdDt set? */ | |
1546 | ata_bad_cdb(cmd, done); | |
1547 | else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */ | |
1548 | ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std); | |
1549 | else if (scsicmd[2] == 0x00) | |
1550 | ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00); | |
1551 | else if (scsicmd[2] == 0x80) | |
1552 | ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80); | |
1553 | else if (scsicmd[2] == 0x83) | |
1554 | ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83); | |
1555 | else | |
1556 | ata_bad_cdb(cmd, done); | |
1557 | break; | |
1558 | ||
1559 | case MODE_SENSE: | |
1560 | case MODE_SENSE_10: | |
1561 | ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense); | |
1562 | break; | |
1563 | ||
1564 | case MODE_SELECT: /* unconditionally return */ | |
1565 | case MODE_SELECT_10: /* bad-field-in-cdb */ | |
1566 | ata_bad_cdb(cmd, done); | |
1567 | break; | |
1568 | ||
1569 | case READ_CAPACITY: | |
1570 | ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); | |
1571 | break; | |
1572 | ||
1573 | case SERVICE_ACTION_IN: | |
1574 | if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16) | |
1575 | ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap); | |
1576 | else | |
1577 | ata_bad_cdb(cmd, done); | |
1578 | break; | |
1579 | ||
1580 | case REPORT_LUNS: | |
1581 | ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns); | |
1582 | break; | |
1583 | ||
1584 | /* mandantory commands we haven't implemented yet */ | |
1585 | case REQUEST_SENSE: | |
1586 | ||
1587 | /* all other commands */ | |
1588 | default: | |
1589 | ata_bad_scsiop(cmd, done); | |
1590 | break; | |
1591 | } | |
1592 | } | |
1593 |