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[PATCH] proc: Remove tasklist_lock from proc_pid_readdir
[linux-2.6.22.y-op.git] / drivers / scsi / libata-scsi.c
blob93d18a74c401c37fe194422377736718c8bb02b1
1 /*
2 * libata-scsi.c - helper library for ATA
3 *
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
6 * on emails.
7 *
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
10 *
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 *
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
29 *
30 * Hardware documentation available from
31 * - http://www.t10.org/
32 * - http://www.t13.org/
33 *
34 */
35
36 #include <linux/kernel.h>
37 #include <linux/blkdev.h>
38 #include <linux/spinlock.h>
39 #include <scsi/scsi.h>
40 #include <scsi/scsi_host.h>
41 #include <scsi/scsi_cmnd.h>
42 #include <scsi/scsi_eh.h>
43 #include <scsi/scsi_device.h>
44 #include <scsi/scsi_tcq.h>
45 #include <scsi/scsi_transport.h>
46 #include <linux/libata.h>
47 #include <linux/hdreg.h>
48 #include <asm/uaccess.h>
49
50 #include "libata.h"
51
52 #define SECTOR_SIZE 512
53
54 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, const u8 *scsicmd);
55
56 static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
57 const struct scsi_device *scsidev);
58 static struct ata_device * ata_scsi_find_dev(struct ata_port *ap,
59 const struct scsi_device *scsidev);
60 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
61 unsigned int id, unsigned int lun);
62
63
64 #define RW_RECOVERY_MPAGE 0x1
65 #define RW_RECOVERY_MPAGE_LEN 12
66 #define CACHE_MPAGE 0x8
67 #define CACHE_MPAGE_LEN 20
68 #define CONTROL_MPAGE 0xa
69 #define CONTROL_MPAGE_LEN 12
70 #define ALL_MPAGES 0x3f
71 #define ALL_SUB_MPAGES 0xff
72
73
74 static const u8 def_rw_recovery_mpage[] = {
75 RW_RECOVERY_MPAGE,
76 RW_RECOVERY_MPAGE_LEN - 2,
77 (1 << 7) | /* AWRE, sat-r06 say it shall be 0 */
78 (1 << 6), /* ARRE (auto read reallocation) */
79 0, /* read retry count */
80 0, 0, 0, 0,
81 0, /* write retry count */
82 0, 0, 0
83 };
84
85 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
86 CACHE_MPAGE,
87 CACHE_MPAGE_LEN - 2,
88 0, /* contains WCE, needs to be 0 for logic */
89 0, 0, 0, 0, 0, 0, 0, 0, 0,
90 0, /* contains DRA, needs to be 0 for logic */
91 0, 0, 0, 0, 0, 0, 0
92 };
93
94 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
95 CONTROL_MPAGE,
96 CONTROL_MPAGE_LEN - 2,
97 2, /* DSENSE=0, GLTSD=1 */
98 0, /* [QAM+QERR may be 1, see 05-359r1] */
99 0, 0, 0, 0, 0xff, 0xff,
100 0, 30 /* extended self test time, see 05-359r1 */
101 };
102
103 /*
104 * libata transport template. libata doesn't do real transport stuff.
105 * It just needs the eh_timed_out hook.
106 */
107 struct scsi_transport_template ata_scsi_transport_template = {
108 .eh_strategy_handler = ata_scsi_error,
109 .eh_timed_out = ata_scsi_timed_out,
110 .user_scan = ata_scsi_user_scan,
111 };
112
113
114 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
115 void (*done)(struct scsi_cmnd *))
116 {
117 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
118 /* "Invalid field in cbd" */
119 done(cmd);
120 }
121
122 /**
123 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
124 * @sdev: SCSI device for which BIOS geometry is to be determined
125 * @bdev: block device associated with @sdev
126 * @capacity: capacity of SCSI device
127 * @geom: location to which geometry will be output
128 *
129 * Generic bios head/sector/cylinder calculator
130 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
131 * mapping. Some situations may arise where the disk is not
132 * bootable if this is not used.
133 *
134 * LOCKING:
135 * Defined by the SCSI layer. We don't really care.
136 *
137 * RETURNS:
138 * Zero.
139 */
140 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
141 sector_t capacity, int geom[])
142 {
143 geom[0] = 255;
144 geom[1] = 63;
145 sector_div(capacity, 255*63);
146 geom[2] = capacity;
147
148 return 0;
149 }
150
151 /**
152 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
153 * @scsidev: Device to which we are issuing command
154 * @arg: User provided data for issuing command
155 *
156 * LOCKING:
157 * Defined by the SCSI layer. We don't really care.
158 *
159 * RETURNS:
160 * Zero on success, negative errno on error.
161 */
162
163 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
164 {
165 int rc = 0;
166 u8 scsi_cmd[MAX_COMMAND_SIZE];
167 u8 args[4], *argbuf = NULL;
168 int argsize = 0;
169 struct scsi_sense_hdr sshdr;
170 enum dma_data_direction data_dir;
171
172 if (arg == NULL)
173 return -EINVAL;
174
175 if (copy_from_user(args, arg, sizeof(args)))
176 return -EFAULT;
177
178 memset(scsi_cmd, 0, sizeof(scsi_cmd));
179
180 if (args[3]) {
181 argsize = SECTOR_SIZE * args[3];
182 argbuf = kmalloc(argsize, GFP_KERNEL);
183 if (argbuf == NULL) {
184 rc = -ENOMEM;
185 goto error;
186 }
187
188 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
189 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
190 block count in sector count field */
191 data_dir = DMA_FROM_DEVICE;
192 } else {
193 scsi_cmd[1] = (3 << 1); /* Non-data */
194 /* scsi_cmd[2] is already 0 -- no off.line, cc, or data xfer */
195 data_dir = DMA_NONE;
196 }
197
198 scsi_cmd[0] = ATA_16;
199
200 scsi_cmd[4] = args[2];
201 if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */
202 scsi_cmd[6] = args[3];
203 scsi_cmd[8] = args[1];
204 scsi_cmd[10] = 0x4f;
205 scsi_cmd[12] = 0xc2;
206 } else {
207 scsi_cmd[6] = args[1];
208 }
209 scsi_cmd[14] = args[0];
210
211 /* Good values for timeout and retries? Values below
212 from scsi_ioctl_send_command() for default case... */
213 if (scsi_execute_req(scsidev, scsi_cmd, data_dir, argbuf, argsize,
214 &sshdr, (10*HZ), 5)) {
215 rc = -EIO;
216 goto error;
217 }
218
219 /* Need code to retrieve data from check condition? */
220
221 if ((argbuf)
222 && copy_to_user(arg + sizeof(args), argbuf, argsize))
223 rc = -EFAULT;
224 error:
225 if (argbuf)
226 kfree(argbuf);
227
228 return rc;
229 }
230
231 /**
232 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
233 * @scsidev: Device to which we are issuing command
234 * @arg: User provided data for issuing command
235 *
236 * LOCKING:
237 * Defined by the SCSI layer. We don't really care.
238 *
239 * RETURNS:
240 * Zero on success, negative errno on error.
241 */
242 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
243 {
244 int rc = 0;
245 u8 scsi_cmd[MAX_COMMAND_SIZE];
246 u8 args[7];
247 struct scsi_sense_hdr sshdr;
248
249 if (arg == NULL)
250 return -EINVAL;
251
252 if (copy_from_user(args, arg, sizeof(args)))
253 return -EFAULT;
254
255 memset(scsi_cmd, 0, sizeof(scsi_cmd));
256 scsi_cmd[0] = ATA_16;
257 scsi_cmd[1] = (3 << 1); /* Non-data */
258 /* scsi_cmd[2] is already 0 -- no off.line, cc, or data xfer */
259 scsi_cmd[4] = args[1];
260 scsi_cmd[6] = args[2];
261 scsi_cmd[8] = args[3];
262 scsi_cmd[10] = args[4];
263 scsi_cmd[12] = args[5];
264 scsi_cmd[14] = args[0];
265
266 /* Good values for timeout and retries? Values below
267 from scsi_ioctl_send_command() for default case... */
268 if (scsi_execute_req(scsidev, scsi_cmd, DMA_NONE, NULL, 0, &sshdr,
269 (10*HZ), 5))
270 rc = -EIO;
271
272 /* Need code to retrieve data from check condition? */
273 return rc;
274 }
275
276 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
277 {
278 int val = -EINVAL, rc = -EINVAL;
279
280 switch (cmd) {
281 case ATA_IOC_GET_IO32:
282 val = 0;
283 if (copy_to_user(arg, &val, 1))
284 return -EFAULT;
285 return 0;
286
287 case ATA_IOC_SET_IO32:
288 val = (unsigned long) arg;
289 if (val != 0)
290 return -EINVAL;
291 return 0;
292
293 case HDIO_DRIVE_CMD:
294 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
295 return -EACCES;
296 return ata_cmd_ioctl(scsidev, arg);
297
298 case HDIO_DRIVE_TASK:
299 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
300 return -EACCES;
301 return ata_task_ioctl(scsidev, arg);
302
303 default:
304 rc = -ENOTTY;
305 break;
306 }
307
308 return rc;
309 }
310
311 /**
312 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
313 * @dev: ATA device to which the new command is attached
314 * @cmd: SCSI command that originated this ATA command
315 * @done: SCSI command completion function
316 *
317 * Obtain a reference to an unused ata_queued_cmd structure,
318 * which is the basic libata structure representing a single
319 * ATA command sent to the hardware.
320 *
321 * If a command was available, fill in the SCSI-specific
322 * portions of the structure with information on the
323 * current command.
324 *
325 * LOCKING:
326 * spin_lock_irqsave(host_set lock)
327 *
328 * RETURNS:
329 * Command allocated, or %NULL if none available.
330 */
331 struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
332 struct scsi_cmnd *cmd,
333 void (*done)(struct scsi_cmnd *))
334 {
335 struct ata_queued_cmd *qc;
336
337 qc = ata_qc_new_init(dev);
338 if (qc) {
339 qc->scsicmd = cmd;
340 qc->scsidone = done;
341
342 if (cmd->use_sg) {
343 qc->__sg = (struct scatterlist *) cmd->request_buffer;
344 qc->n_elem = cmd->use_sg;
345 } else {
346 qc->__sg = &qc->sgent;
347 qc->n_elem = 1;
348 }
349 } else {
350 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
351 done(cmd);
352 }
353
354 return qc;
355 }
356
357 /**
358 * ata_dump_status - user friendly display of error info
359 * @id: id of the port in question
360 * @tf: ptr to filled out taskfile
361 *
362 * Decode and dump the ATA error/status registers for the user so
363 * that they have some idea what really happened at the non
364 * make-believe layer.
365 *
366 * LOCKING:
367 * inherited from caller
368 */
369 void ata_dump_status(unsigned id, struct ata_taskfile *tf)
370 {
371 u8 stat = tf->command, err = tf->feature;
372
373 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
374 if (stat & ATA_BUSY) {
375 printk("Busy }\n"); /* Data is not valid in this case */
376 } else {
377 if (stat & 0x40) printk("DriveReady ");
378 if (stat & 0x20) printk("DeviceFault ");
379 if (stat & 0x10) printk("SeekComplete ");
380 if (stat & 0x08) printk("DataRequest ");
381 if (stat & 0x04) printk("CorrectedError ");
382 if (stat & 0x02) printk("Index ");
383 if (stat & 0x01) printk("Error ");
384 printk("}\n");
385
386 if (err) {
387 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
388 if (err & 0x04) printk("DriveStatusError ");
389 if (err & 0x80) {
390 if (err & 0x04) printk("BadCRC ");
391 else printk("Sector ");
392 }
393 if (err & 0x40) printk("UncorrectableError ");
394 if (err & 0x10) printk("SectorIdNotFound ");
395 if (err & 0x02) printk("TrackZeroNotFound ");
396 if (err & 0x01) printk("AddrMarkNotFound ");
397 printk("}\n");
398 }
399 }
400 }
401
402 int ata_scsi_device_resume(struct scsi_device *sdev)
403 {
404 struct ata_port *ap = ata_shost_to_port(sdev->host);
405 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
406
407 return ata_device_resume(dev);
408 }
409
410 int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t state)
411 {
412 struct ata_port *ap = ata_shost_to_port(sdev->host);
413 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
414
415 return ata_device_suspend(dev, state);
416 }
417
418 /**
419 * ata_to_sense_error - convert ATA error to SCSI error
420 * @id: ATA device number
421 * @drv_stat: value contained in ATA status register
422 * @drv_err: value contained in ATA error register
423 * @sk: the sense key we'll fill out
424 * @asc: the additional sense code we'll fill out
425 * @ascq: the additional sense code qualifier we'll fill out
426 * @verbose: be verbose
427 *
428 * Converts an ATA error into a SCSI error. Fill out pointers to
429 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
430 * format sense blocks.
431 *
432 * LOCKING:
433 * spin_lock_irqsave(host_set lock)
434 */
435 void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, u8 *asc,
436 u8 *ascq, int verbose)
437 {
438 int i;
439
440 /* Based on the 3ware driver translation table */
441 static const unsigned char sense_table[][4] = {
442 /* BBD|ECC|ID|MAR */
443 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
444 /* BBD|ECC|ID */
445 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
446 /* ECC|MC|MARK */
447 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
448 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
449 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
450 /* MC|ID|ABRT|TRK0|MARK */
451 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
452 /* MCR|MARK */
453 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
454 /* Bad address mark */
455 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
456 /* TRK0 */
457 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
458 /* Abort & !ICRC */
459 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
460 /* Media change request */
461 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
462 /* SRV */
463 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
464 /* Media change */
465 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
466 /* ECC */
467 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
468 /* BBD - block marked bad */
469 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
470 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
471 };
472 static const unsigned char stat_table[][4] = {
473 /* Must be first because BUSY means no other bits valid */
474 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
475 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
476 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
477 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
478 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
479 };
480
481 /*
482 * Is this an error we can process/parse
483 */
484 if (drv_stat & ATA_BUSY) {
485 drv_err = 0; /* Ignore the err bits, they're invalid */
486 }
487
488 if (drv_err) {
489 /* Look for drv_err */
490 for (i = 0; sense_table[i][0] != 0xFF; i++) {
491 /* Look for best matches first */
492 if ((sense_table[i][0] & drv_err) ==
493 sense_table[i][0]) {
494 *sk = sense_table[i][1];
495 *asc = sense_table[i][2];
496 *ascq = sense_table[i][3];
497 goto translate_done;
498 }
499 }
500 /* No immediate match */
501 if (verbose)
502 printk(KERN_WARNING "ata%u: no sense translation for "
503 "error 0x%02x\n", id, drv_err);
504 }
505
506 /* Fall back to interpreting status bits */
507 for (i = 0; stat_table[i][0] != 0xFF; i++) {
508 if (stat_table[i][0] & drv_stat) {
509 *sk = stat_table[i][1];
510 *asc = stat_table[i][2];
511 *ascq = stat_table[i][3];
512 goto translate_done;
513 }
514 }
515 /* No error? Undecoded? */
516 if (verbose)
517 printk(KERN_WARNING "ata%u: no sense translation for "
518 "status: 0x%02x\n", id, drv_stat);
519
520 /* We need a sensible error return here, which is tricky, and one
521 that won't cause people to do things like return a disk wrongly */
522 *sk = ABORTED_COMMAND;
523 *asc = 0x00;
524 *ascq = 0x00;
525
526 translate_done:
527 if (verbose)
528 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
529 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
530 id, drv_stat, drv_err, *sk, *asc, *ascq);
531 return;
532 }
533
534 /*
535 * ata_gen_ata_desc_sense - Generate check condition sense block.
536 * @qc: Command that completed.
537 *
538 * This function is specific to the ATA descriptor format sense
539 * block specified for the ATA pass through commands. Regardless
540 * of whether the command errored or not, return a sense
541 * block. Copy all controller registers into the sense
542 * block. Clear sense key, ASC & ASCQ if there is no error.
543 *
544 * LOCKING:
545 * spin_lock_irqsave(host_set lock)
546 */
547 void ata_gen_ata_desc_sense(struct ata_queued_cmd *qc)
548 {
549 struct scsi_cmnd *cmd = qc->scsicmd;
550 struct ata_taskfile *tf = &qc->result_tf;
551 unsigned char *sb = cmd->sense_buffer;
552 unsigned char *desc = sb + 8;
553 int verbose = qc->ap->ops->error_handler == NULL;
554
555 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
556
557 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
558
559 /*
560 * Use ata_to_sense_error() to map status register bits
561 * onto sense key, asc & ascq.
562 */
563 if (qc->err_mask ||
564 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
565 ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
566 &sb[1], &sb[2], &sb[3], verbose);
567 sb[1] &= 0x0f;
568 }
569
570 /*
571 * Sense data is current and format is descriptor.
572 */
573 sb[0] = 0x72;
574
575 desc[0] = 0x09;
576
577 /*
578 * Set length of additional sense data.
579 * Since we only populate descriptor 0, the total
580 * length is the same (fixed) length as descriptor 0.
581 */
582 desc[1] = sb[7] = 14;
583
584 /*
585 * Copy registers into sense buffer.
586 */
587 desc[2] = 0x00;
588 desc[3] = tf->feature; /* == error reg */
589 desc[5] = tf->nsect;
590 desc[7] = tf->lbal;
591 desc[9] = tf->lbam;
592 desc[11] = tf->lbah;
593 desc[12] = tf->device;
594 desc[13] = tf->command; /* == status reg */
595
596 /*
597 * Fill in Extend bit, and the high order bytes
598 * if applicable.
599 */
600 if (tf->flags & ATA_TFLAG_LBA48) {
601 desc[2] |= 0x01;
602 desc[4] = tf->hob_nsect;
603 desc[6] = tf->hob_lbal;
604 desc[8] = tf->hob_lbam;
605 desc[10] = tf->hob_lbah;
606 }
607 }
608
609 /**
610 * ata_gen_fixed_sense - generate a SCSI fixed sense block
611 * @qc: Command that we are erroring out
612 *
613 * Leverage ata_to_sense_error() to give us the codes. Fit our
614 * LBA in here if there's room.
615 *
616 * LOCKING:
617 * inherited from caller
618 */
619 void ata_gen_fixed_sense(struct ata_queued_cmd *qc)
620 {
621 struct scsi_cmnd *cmd = qc->scsicmd;
622 struct ata_taskfile *tf = &qc->result_tf;
623 unsigned char *sb = cmd->sense_buffer;
624 int verbose = qc->ap->ops->error_handler == NULL;
625
626 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
627
628 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
629
630 /*
631 * Use ata_to_sense_error() to map status register bits
632 * onto sense key, asc & ascq.
633 */
634 if (qc->err_mask ||
635 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
636 ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
637 &sb[2], &sb[12], &sb[13], verbose);
638 sb[2] &= 0x0f;
639 }
640
641 sb[0] = 0x70;
642 sb[7] = 0x0a;
643
644 if (tf->flags & ATA_TFLAG_LBA48) {
645 /* TODO: find solution for LBA48 descriptors */
646 }
647
648 else if (tf->flags & ATA_TFLAG_LBA) {
649 /* A small (28b) LBA will fit in the 32b info field */
650 sb[0] |= 0x80; /* set valid bit */
651 sb[3] = tf->device & 0x0f;
652 sb[4] = tf->lbah;
653 sb[5] = tf->lbam;
654 sb[6] = tf->lbal;
655 }
656
657 else {
658 /* TODO: C/H/S */
659 }
660 }
661
662 static void ata_scsi_sdev_config(struct scsi_device *sdev)
663 {
664 sdev->use_10_for_rw = 1;
665 sdev->use_10_for_ms = 1;
666 }
667
668 static void ata_scsi_dev_config(struct scsi_device *sdev,
669 struct ata_device *dev)
670 {
671 unsigned int max_sectors;
672
673 /* TODO: 2048 is an arbitrary number, not the
674 * hardware maximum. This should be increased to
675 * 65534 when Jens Axboe's patch for dynamically
676 * determining max_sectors is merged.
677 */
678 max_sectors = ATA_MAX_SECTORS;
679 if (dev->flags & ATA_DFLAG_LBA48)
680 max_sectors = ATA_MAX_SECTORS_LBA48;
681 if (dev->max_sectors)
682 max_sectors = dev->max_sectors;
683
684 blk_queue_max_sectors(sdev->request_queue, max_sectors);
685
686 /*
687 * SATA DMA transfers must be multiples of 4 byte, so
688 * we need to pad ATAPI transfers using an extra sg.
689 * Decrement max hw segments accordingly.
690 */
691 if (dev->class == ATA_DEV_ATAPI) {
692 request_queue_t *q = sdev->request_queue;
693 blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
694 }
695
696 if (dev->flags & ATA_DFLAG_NCQ) {
697 int depth;
698
699 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
700 depth = min(ATA_MAX_QUEUE - 1, depth);
701 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
702 }
703 }
704
705 /**
706 * ata_scsi_slave_config - Set SCSI device attributes
707 * @sdev: SCSI device to examine
708 *
709 * This is called before we actually start reading
710 * and writing to the device, to configure certain
711 * SCSI mid-layer behaviors.
712 *
713 * LOCKING:
714 * Defined by SCSI layer. We don't really care.
715 */
716
717 int ata_scsi_slave_config(struct scsi_device *sdev)
718 {
719 struct ata_port *ap = ata_shost_to_port(sdev->host);
720 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
721
722 ata_scsi_sdev_config(sdev);
723
724 blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);
725
726 if (dev)
727 ata_scsi_dev_config(sdev, dev);
728
729 return 0; /* scsi layer doesn't check return value, sigh */
730 }
731
732 /**
733 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
734 * @sdev: SCSI device to be destroyed
735 *
736 * @sdev is about to be destroyed for hot/warm unplugging. If
737 * this unplugging was initiated by libata as indicated by NULL
738 * dev->sdev, this function doesn't have to do anything.
739 * Otherwise, SCSI layer initiated warm-unplug is in progress.
740 * Clear dev->sdev, schedule the device for ATA detach and invoke
741 * EH.
742 *
743 * LOCKING:
744 * Defined by SCSI layer. We don't really care.
745 */
746 void ata_scsi_slave_destroy(struct scsi_device *sdev)
747 {
748 struct ata_port *ap = ata_shost_to_port(sdev->host);
749 unsigned long flags;
750 struct ata_device *dev;
751
752 if (!ap->ops->error_handler)
753 return;
754
755 spin_lock_irqsave(ap->lock, flags);
756 dev = __ata_scsi_find_dev(ap, sdev);
757 if (dev && dev->sdev) {
758 /* SCSI device already in CANCEL state, no need to offline it */
759 dev->sdev = NULL;
760 dev->flags |= ATA_DFLAG_DETACH;
761 ata_port_schedule_eh(ap);
762 }
763 spin_unlock_irqrestore(ap->lock, flags);
764 }
765
766 /**
767 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
768 * @sdev: SCSI device to configure queue depth for
769 * @queue_depth: new queue depth
770 *
771 * This is libata standard hostt->change_queue_depth callback.
772 * SCSI will call into this callback when user tries to set queue
773 * depth via sysfs.
774 *
775 * LOCKING:
776 * SCSI layer (we don't care)
777 *
778 * RETURNS:
779 * Newly configured queue depth.
780 */
781 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
782 {
783 struct ata_port *ap = ata_shost_to_port(sdev->host);
784 struct ata_device *dev;
785 int max_depth;
786
787 if (queue_depth < 1)
788 return sdev->queue_depth;
789
790 dev = ata_scsi_find_dev(ap, sdev);
791 if (!dev || !ata_dev_enabled(dev))
792 return sdev->queue_depth;
793
794 max_depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
795 max_depth = min(ATA_MAX_QUEUE - 1, max_depth);
796 if (queue_depth > max_depth)
797 queue_depth = max_depth;
798
799 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
800 return queue_depth;
801 }
802
803 /**
804 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
805 * @qc: Storage for translated ATA taskfile
806 * @scsicmd: SCSI command to translate
807 *
808 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
809 * (to start). Perhaps these commands should be preceded by
810 * CHECK POWER MODE to see what power mode the device is already in.
811 * [See SAT revision 5 at www.t10.org]
812 *
813 * LOCKING:
814 * spin_lock_irqsave(host_set lock)
815 *
816 * RETURNS:
817 * Zero on success, non-zero on error.
818 */
819
820 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc,
821 const u8 *scsicmd)
822 {
823 struct ata_taskfile *tf = &qc->tf;
824
825 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
826 tf->protocol = ATA_PROT_NODATA;
827 if (scsicmd[1] & 0x1) {
828 ; /* ignore IMMED bit, violates sat-r05 */
829 }
830 if (scsicmd[4] & 0x2)
831 goto invalid_fld; /* LOEJ bit set not supported */
832 if (((scsicmd[4] >> 4) & 0xf) != 0)
833 goto invalid_fld; /* power conditions not supported */
834 if (scsicmd[4] & 0x1) {
835 tf->nsect = 1; /* 1 sector, lba=0 */
836
837 if (qc->dev->flags & ATA_DFLAG_LBA) {
838 tf->flags |= ATA_TFLAG_LBA;
839
840 tf->lbah = 0x0;
841 tf->lbam = 0x0;
842 tf->lbal = 0x0;
843 tf->device |= ATA_LBA;
844 } else {
845 /* CHS */
846 tf->lbal = 0x1; /* sect */
847 tf->lbam = 0x0; /* cyl low */
848 tf->lbah = 0x0; /* cyl high */
849 }
850
851 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
852 } else {
853 tf->nsect = 0; /* time period value (0 implies now) */
854 tf->command = ATA_CMD_STANDBY;
855 /* Consider: ATA STANDBY IMMEDIATE command */
856 }
857 /*
858 * Standby and Idle condition timers could be implemented but that
859 * would require libata to implement the Power condition mode page
860 * and allow the user to change it. Changing mode pages requires
861 * MODE SELECT to be implemented.
862 */
863
864 return 0;
865
866 invalid_fld:
867 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
868 /* "Invalid field in cbd" */
869 return 1;
870 }
871
872
873 /**
874 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
875 * @qc: Storage for translated ATA taskfile
876 * @scsicmd: SCSI command to translate (ignored)
877 *
878 * Sets up an ATA taskfile to issue FLUSH CACHE or
879 * FLUSH CACHE EXT.
880 *
881 * LOCKING:
882 * spin_lock_irqsave(host_set lock)
883 *
884 * RETURNS:
885 * Zero on success, non-zero on error.
886 */
887
888 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
889 {
890 struct ata_taskfile *tf = &qc->tf;
891
892 tf->flags |= ATA_TFLAG_DEVICE;
893 tf->protocol = ATA_PROT_NODATA;
894
895 if ((qc->dev->flags & ATA_DFLAG_LBA48) &&
896 (ata_id_has_flush_ext(qc->dev->id)))
897 tf->command = ATA_CMD_FLUSH_EXT;
898 else
899 tf->command = ATA_CMD_FLUSH;
900
901 return 0;
902 }
903
904 /**
905 * scsi_6_lba_len - Get LBA and transfer length
906 * @scsicmd: SCSI command to translate
907 *
908 * Calculate LBA and transfer length for 6-byte commands.
909 *
910 * RETURNS:
911 * @plba: the LBA
912 * @plen: the transfer length
913 */
914
915 static void scsi_6_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
916 {
917 u64 lba = 0;
918 u32 len = 0;
919
920 VPRINTK("six-byte command\n");
921
922 lba |= ((u64)scsicmd[2]) << 8;
923 lba |= ((u64)scsicmd[3]);
924
925 len |= ((u32)scsicmd[4]);
926
927 *plba = lba;
928 *plen = len;
929 }
930
931 /**
932 * scsi_10_lba_len - Get LBA and transfer length
933 * @scsicmd: SCSI command to translate
934 *
935 * Calculate LBA and transfer length for 10-byte commands.
936 *
937 * RETURNS:
938 * @plba: the LBA
939 * @plen: the transfer length
940 */
941
942 static void scsi_10_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
943 {
944 u64 lba = 0;
945 u32 len = 0;
946
947 VPRINTK("ten-byte command\n");
948
949 lba |= ((u64)scsicmd[2]) << 24;
950 lba |= ((u64)scsicmd[3]) << 16;
951 lba |= ((u64)scsicmd[4]) << 8;
952 lba |= ((u64)scsicmd[5]);
953
954 len |= ((u32)scsicmd[7]) << 8;
955 len |= ((u32)scsicmd[8]);
956
957 *plba = lba;
958 *plen = len;
959 }
960
961 /**
962 * scsi_16_lba_len - Get LBA and transfer length
963 * @scsicmd: SCSI command to translate
964 *
965 * Calculate LBA and transfer length for 16-byte commands.
966 *
967 * RETURNS:
968 * @plba: the LBA
969 * @plen: the transfer length
970 */
971
972 static void scsi_16_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
973 {
974 u64 lba = 0;
975 u32 len = 0;
976
977 VPRINTK("sixteen-byte command\n");
978
979 lba |= ((u64)scsicmd[2]) << 56;
980 lba |= ((u64)scsicmd[3]) << 48;
981 lba |= ((u64)scsicmd[4]) << 40;
982 lba |= ((u64)scsicmd[5]) << 32;
983 lba |= ((u64)scsicmd[6]) << 24;
984 lba |= ((u64)scsicmd[7]) << 16;
985 lba |= ((u64)scsicmd[8]) << 8;
986 lba |= ((u64)scsicmd[9]);
987
988 len |= ((u32)scsicmd[10]) << 24;
989 len |= ((u32)scsicmd[11]) << 16;
990 len |= ((u32)scsicmd[12]) << 8;
991 len |= ((u32)scsicmd[13]);
992
993 *plba = lba;
994 *plen = len;
995 }
996
997 /**
998 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
999 * @qc: Storage for translated ATA taskfile
1000 * @scsicmd: SCSI command to translate
1001 *
1002 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1003 *
1004 * LOCKING:
1005 * spin_lock_irqsave(host_set lock)
1006 *
1007 * RETURNS:
1008 * Zero on success, non-zero on error.
1009 */
1010
1011 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
1012 {
1013 struct ata_taskfile *tf = &qc->tf;
1014 struct ata_device *dev = qc->dev;
1015 u64 dev_sectors = qc->dev->n_sectors;
1016 u64 block;
1017 u32 n_block;
1018
1019 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1020 tf->protocol = ATA_PROT_NODATA;
1021
1022 if (scsicmd[0] == VERIFY)
1023 scsi_10_lba_len(scsicmd, &block, &n_block);
1024 else if (scsicmd[0] == VERIFY_16)
1025 scsi_16_lba_len(scsicmd, &block, &n_block);
1026 else
1027 goto invalid_fld;
1028
1029 if (!n_block)
1030 goto nothing_to_do;
1031 if (block >= dev_sectors)
1032 goto out_of_range;
1033 if ((block + n_block) > dev_sectors)
1034 goto out_of_range;
1035
1036 if (dev->flags & ATA_DFLAG_LBA) {
1037 tf->flags |= ATA_TFLAG_LBA;
1038
1039 if (lba_28_ok(block, n_block)) {
1040 /* use LBA28 */
1041 tf->command = ATA_CMD_VERIFY;
1042 tf->device |= (block >> 24) & 0xf;
1043 } else if (lba_48_ok(block, n_block)) {
1044 if (!(dev->flags & ATA_DFLAG_LBA48))
1045 goto out_of_range;
1046
1047 /* use LBA48 */
1048 tf->flags |= ATA_TFLAG_LBA48;
1049 tf->command = ATA_CMD_VERIFY_EXT;
1050
1051 tf->hob_nsect = (n_block >> 8) & 0xff;
1052
1053 tf->hob_lbah = (block >> 40) & 0xff;
1054 tf->hob_lbam = (block >> 32) & 0xff;
1055 tf->hob_lbal = (block >> 24) & 0xff;
1056 } else
1057 /* request too large even for LBA48 */
1058 goto out_of_range;
1059
1060 tf->nsect = n_block & 0xff;
1061
1062 tf->lbah = (block >> 16) & 0xff;
1063 tf->lbam = (block >> 8) & 0xff;
1064 tf->lbal = block & 0xff;
1065
1066 tf->device |= ATA_LBA;
1067 } else {
1068 /* CHS */
1069 u32 sect, head, cyl, track;
1070
1071 if (!lba_28_ok(block, n_block))
1072 goto out_of_range;
1073
1074 /* Convert LBA to CHS */
1075 track = (u32)block / dev->sectors;
1076 cyl = track / dev->heads;
1077 head = track % dev->heads;
1078 sect = (u32)block % dev->sectors + 1;
1079
1080 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1081 (u32)block, track, cyl, head, sect);
1082
1083 /* Check whether the converted CHS can fit.
1084 Cylinder: 0-65535
1085 Head: 0-15
1086 Sector: 1-255*/
1087 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1088 goto out_of_range;
1089
1090 tf->command = ATA_CMD_VERIFY;
1091 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1092 tf->lbal = sect;
1093 tf->lbam = cyl;
1094 tf->lbah = cyl >> 8;
1095 tf->device |= head;
1096 }
1097
1098 return 0;
1099
1100 invalid_fld:
1101 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
1102 /* "Invalid field in cbd" */
1103 return 1;
1104
1105 out_of_range:
1106 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
1107 /* "Logical Block Address out of range" */
1108 return 1;
1109
1110 nothing_to_do:
1111 qc->scsicmd->result = SAM_STAT_GOOD;
1112 return 1;
1113 }
1114
1115 /**
1116 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1117 * @qc: Storage for translated ATA taskfile
1118 * @scsicmd: SCSI command to translate
1119 *
1120 * Converts any of six SCSI read/write commands into the
1121 * ATA counterpart, including starting sector (LBA),
1122 * sector count, and taking into account the device's LBA48
1123 * support.
1124 *
1125 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1126 * %WRITE_16 are currently supported.
1127 *
1128 * LOCKING:
1129 * spin_lock_irqsave(host_set lock)
1130 *
1131 * RETURNS:
1132 * Zero on success, non-zero on error.
1133 */
1134
1135 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
1136 {
1137 struct ata_taskfile *tf = &qc->tf;
1138 struct ata_device *dev = qc->dev;
1139 u64 block;
1140 u32 n_block;
1141
1142 qc->flags |= ATA_QCFLAG_IO;
1143 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1144
1145 if (scsicmd[0] == WRITE_10 || scsicmd[0] == WRITE_6 ||
1146 scsicmd[0] == WRITE_16)
1147 tf->flags |= ATA_TFLAG_WRITE;
1148
1149 /* Calculate the SCSI LBA, transfer length and FUA. */
1150 switch (scsicmd[0]) {
1151 case READ_10:
1152 case WRITE_10:
1153 scsi_10_lba_len(scsicmd, &block, &n_block);
1154 if (unlikely(scsicmd[1] & (1 << 3)))
1155 tf->flags |= ATA_TFLAG_FUA;
1156 break;
1157 case READ_6:
1158 case WRITE_6:
1159 scsi_6_lba_len(scsicmd, &block, &n_block);
1160
1161 /* for 6-byte r/w commands, transfer length 0
1162 * means 256 blocks of data, not 0 block.
1163 */
1164 if (!n_block)
1165 n_block = 256;
1166 break;
1167 case READ_16:
1168 case WRITE_16:
1169 scsi_16_lba_len(scsicmd, &block, &n_block);
1170 if (unlikely(scsicmd[1] & (1 << 3)))
1171 tf->flags |= ATA_TFLAG_FUA;
1172 break;
1173 default:
1174 DPRINTK("no-byte command\n");
1175 goto invalid_fld;
1176 }
1177
1178 /* Check and compose ATA command */
1179 if (!n_block)
1180 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1181 * length 0 means transfer 0 block of data.
1182 * However, for ATA R/W commands, sector count 0 means
1183 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1184 *
1185 * WARNING: one or two older ATA drives treat 0 as 0...
1186 */
1187 goto nothing_to_do;
1188
1189 if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ) {
1190 /* yay, NCQ */
1191 if (!lba_48_ok(block, n_block))
1192 goto out_of_range;
1193
1194 tf->protocol = ATA_PROT_NCQ;
1195 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
1196
1197 if (tf->flags & ATA_TFLAG_WRITE)
1198 tf->command = ATA_CMD_FPDMA_WRITE;
1199 else
1200 tf->command = ATA_CMD_FPDMA_READ;
1201
1202 qc->nsect = n_block;
1203
1204 tf->nsect = qc->tag << 3;
1205 tf->hob_feature = (n_block >> 8) & 0xff;
1206 tf->feature = n_block & 0xff;
1207
1208 tf->hob_lbah = (block >> 40) & 0xff;
1209 tf->hob_lbam = (block >> 32) & 0xff;
1210 tf->hob_lbal = (block >> 24) & 0xff;
1211 tf->lbah = (block >> 16) & 0xff;
1212 tf->lbam = (block >> 8) & 0xff;
1213 tf->lbal = block & 0xff;
1214
1215 tf->device = 1 << 6;
1216 if (tf->flags & ATA_TFLAG_FUA)
1217 tf->device |= 1 << 7;
1218 } else if (dev->flags & ATA_DFLAG_LBA) {
1219 tf->flags |= ATA_TFLAG_LBA;
1220
1221 if (lba_28_ok(block, n_block)) {
1222 /* use LBA28 */
1223 tf->device |= (block >> 24) & 0xf;
1224 } else if (lba_48_ok(block, n_block)) {
1225 if (!(dev->flags & ATA_DFLAG_LBA48))
1226 goto out_of_range;
1227
1228 /* use LBA48 */
1229 tf->flags |= ATA_TFLAG_LBA48;
1230
1231 tf->hob_nsect = (n_block >> 8) & 0xff;
1232
1233 tf->hob_lbah = (block >> 40) & 0xff;
1234 tf->hob_lbam = (block >> 32) & 0xff;
1235 tf->hob_lbal = (block >> 24) & 0xff;
1236 } else
1237 /* request too large even for LBA48 */
1238 goto out_of_range;
1239
1240 if (unlikely(ata_rwcmd_protocol(qc) < 0))
1241 goto invalid_fld;
1242
1243 qc->nsect = n_block;
1244 tf->nsect = n_block & 0xff;
1245
1246 tf->lbah = (block >> 16) & 0xff;
1247 tf->lbam = (block >> 8) & 0xff;
1248 tf->lbal = block & 0xff;
1249
1250 tf->device |= ATA_LBA;
1251 } else {
1252 /* CHS */
1253 u32 sect, head, cyl, track;
1254
1255 /* The request -may- be too large for CHS addressing. */
1256 if (!lba_28_ok(block, n_block))
1257 goto out_of_range;
1258
1259 if (unlikely(ata_rwcmd_protocol(qc) < 0))
1260 goto invalid_fld;
1261
1262 /* Convert LBA to CHS */
1263 track = (u32)block / dev->sectors;
1264 cyl = track / dev->heads;
1265 head = track % dev->heads;
1266 sect = (u32)block % dev->sectors + 1;
1267
1268 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1269 (u32)block, track, cyl, head, sect);
1270
1271 /* Check whether the converted CHS can fit.
1272 Cylinder: 0-65535
1273 Head: 0-15
1274 Sector: 1-255*/
1275 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1276 goto out_of_range;
1277
1278 qc->nsect = n_block;
1279 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1280 tf->lbal = sect;
1281 tf->lbam = cyl;
1282 tf->lbah = cyl >> 8;
1283 tf->device |= head;
1284 }
1285
1286 return 0;
1287
1288 invalid_fld:
1289 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
1290 /* "Invalid field in cbd" */
1291 return 1;
1292
1293 out_of_range:
1294 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
1295 /* "Logical Block Address out of range" */
1296 return 1;
1297
1298 nothing_to_do:
1299 qc->scsicmd->result = SAM_STAT_GOOD;
1300 return 1;
1301 }
1302
1303 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1304 {
1305 struct scsi_cmnd *cmd = qc->scsicmd;
1306 u8 *cdb = cmd->cmnd;
1307 int need_sense = (qc->err_mask != 0);
1308
1309 /* We snoop the SET_FEATURES - Write Cache ON/OFF command, and
1310 * schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE
1311 * cache
1312 */
1313 if (!need_sense && (qc->tf.command == ATA_CMD_SET_FEATURES) &&
1314 ((qc->tf.feature == SETFEATURES_WC_ON) ||
1315 (qc->tf.feature == SETFEATURES_WC_OFF))) {
1316 qc->ap->eh_info.action |= ATA_EH_REVALIDATE;
1317 ata_port_schedule_eh(qc->ap);
1318 }
1319
1320 /* For ATA pass thru (SAT) commands, generate a sense block if
1321 * user mandated it or if there's an error. Note that if we
1322 * generate because the user forced us to, a check condition
1323 * is generated and the ATA register values are returned
1324 * whether the command completed successfully or not. If there
1325 * was no error, SK, ASC and ASCQ will all be zero.
1326 */
1327 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1328 ((cdb[2] & 0x20) || need_sense)) {
1329 ata_gen_ata_desc_sense(qc);
1330 } else {
1331 if (!need_sense) {
1332 cmd->result = SAM_STAT_GOOD;
1333 } else {
1334 /* TODO: decide which descriptor format to use
1335 * for 48b LBA devices and call that here
1336 * instead of the fixed desc, which is only
1337 * good for smaller LBA (and maybe CHS?)
1338 * devices.
1339 */
1340 ata_gen_fixed_sense(qc);
1341 }
1342 }
1343
1344 if (need_sense && !qc->ap->ops->error_handler)
1345 ata_dump_status(qc->ap->id, &qc->result_tf);
1346
1347 qc->scsidone(cmd);
1348
1349 ata_qc_free(qc);
1350 }
1351
1352 /**
1353 * ata_scmd_need_defer - Check whether we need to defer scmd
1354 * @dev: ATA device to which the command is addressed
1355 * @is_io: Is the command IO (and thus possibly NCQ)?
1356 *
1357 * NCQ and non-NCQ commands cannot run together. As upper layer
1358 * only knows the queue depth, we are responsible for maintaining
1359 * exclusion. This function checks whether a new command can be
1360 * issued to @dev.
1361 *
1362 * LOCKING:
1363 * spin_lock_irqsave(host_set lock)
1364 *
1365 * RETURNS:
1366 * 1 if deferring is needed, 0 otherwise.
1367 */
1368 static int ata_scmd_need_defer(struct ata_device *dev, int is_io)
1369 {
1370 struct ata_port *ap = dev->ap;
1371
1372 if (!(dev->flags & ATA_DFLAG_NCQ))
1373 return 0;
1374
1375 if (is_io) {
1376 if (!ata_tag_valid(ap->active_tag))
1377 return 0;
1378 } else {
1379 if (!ata_tag_valid(ap->active_tag) && !ap->sactive)
1380 return 0;
1381 }
1382 return 1;
1383 }
1384
1385 /**
1386 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1387 * @dev: ATA device to which the command is addressed
1388 * @cmd: SCSI command to execute
1389 * @done: SCSI command completion function
1390 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1391 *
1392 * Our ->queuecommand() function has decided that the SCSI
1393 * command issued can be directly translated into an ATA
1394 * command, rather than handled internally.
1395 *
1396 * This function sets up an ata_queued_cmd structure for the
1397 * SCSI command, and sends that ata_queued_cmd to the hardware.
1398 *
1399 * The xlat_func argument (actor) returns 0 if ready to execute
1400 * ATA command, else 1 to finish translation. If 1 is returned
1401 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1402 * to be set reflecting an error condition or clean (early)
1403 * termination.
1404 *
1405 * LOCKING:
1406 * spin_lock_irqsave(host_set lock)
1407 *
1408 * RETURNS:
1409 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1410 * needs to be deferred.
1411 */
1412 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1413 void (*done)(struct scsi_cmnd *),
1414 ata_xlat_func_t xlat_func)
1415 {
1416 struct ata_queued_cmd *qc;
1417 u8 *scsicmd = cmd->cmnd;
1418 int is_io = xlat_func == ata_scsi_rw_xlat;
1419
1420 VPRINTK("ENTER\n");
1421
1422 if (unlikely(ata_scmd_need_defer(dev, is_io)))
1423 goto defer;
1424
1425 qc = ata_scsi_qc_new(dev, cmd, done);
1426 if (!qc)
1427 goto err_mem;
1428
1429 /* data is present; dma-map it */
1430 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1431 cmd->sc_data_direction == DMA_TO_DEVICE) {
1432 if (unlikely(cmd->request_bufflen < 1)) {
1433 ata_dev_printk(dev, KERN_WARNING,
1434 "WARNING: zero len r/w req\n");
1435 goto err_did;
1436 }
1437
1438 if (cmd->use_sg)
1439 ata_sg_init(qc, cmd->request_buffer, cmd->use_sg);
1440 else
1441 ata_sg_init_one(qc, cmd->request_buffer,
1442 cmd->request_bufflen);
1443
1444 qc->dma_dir = cmd->sc_data_direction;
1445 }
1446
1447 qc->complete_fn = ata_scsi_qc_complete;
1448
1449 if (xlat_func(qc, scsicmd))
1450 goto early_finish;
1451
1452 /* select device, send command to hardware */
1453 ata_qc_issue(qc);
1454
1455 VPRINTK("EXIT\n");
1456 return 0;
1457
1458 early_finish:
1459 ata_qc_free(qc);
1460 done(cmd);
1461 DPRINTK("EXIT - early finish (good or error)\n");
1462 return 0;
1463
1464 err_did:
1465 ata_qc_free(qc);
1466 err_mem:
1467 cmd->result = (DID_ERROR << 16);
1468 done(cmd);
1469 DPRINTK("EXIT - internal\n");
1470 return 0;
1471
1472 defer:
1473 DPRINTK("EXIT - defer\n");
1474 return SCSI_MLQUEUE_DEVICE_BUSY;
1475 }
1476
1477 /**
1478 * ata_scsi_rbuf_get - Map response buffer.
1479 * @cmd: SCSI command containing buffer to be mapped.
1480 * @buf_out: Pointer to mapped area.
1481 *
1482 * Maps buffer contained within SCSI command @cmd.
1483 *
1484 * LOCKING:
1485 * spin_lock_irqsave(host_set lock)
1486 *
1487 * RETURNS:
1488 * Length of response buffer.
1489 */
1490
1491 static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
1492 {
1493 u8 *buf;
1494 unsigned int buflen;
1495
1496 if (cmd->use_sg) {
1497 struct scatterlist *sg;
1498
1499 sg = (struct scatterlist *) cmd->request_buffer;
1500 buf = kmap_atomic(sg->page, KM_USER0) + sg->offset;
1501 buflen = sg->length;
1502 } else {
1503 buf = cmd->request_buffer;
1504 buflen = cmd->request_bufflen;
1505 }
1506
1507 *buf_out = buf;
1508 return buflen;
1509 }
1510
1511 /**
1512 * ata_scsi_rbuf_put - Unmap response buffer.
1513 * @cmd: SCSI command containing buffer to be unmapped.
1514 * @buf: buffer to unmap
1515 *
1516 * Unmaps response buffer contained within @cmd.
1517 *
1518 * LOCKING:
1519 * spin_lock_irqsave(host_set lock)
1520 */
1521
1522 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
1523 {
1524 if (cmd->use_sg) {
1525 struct scatterlist *sg;
1526
1527 sg = (struct scatterlist *) cmd->request_buffer;
1528 kunmap_atomic(buf - sg->offset, KM_USER0);
1529 }
1530 }
1531
1532 /**
1533 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1534 * @args: device IDENTIFY data / SCSI command of interest.
1535 * @actor: Callback hook for desired SCSI command simulator
1536 *
1537 * Takes care of the hard work of simulating a SCSI command...
1538 * Mapping the response buffer, calling the command's handler,
1539 * and handling the handler's return value. This return value
1540 * indicates whether the handler wishes the SCSI command to be
1541 * completed successfully (0), or not (in which case cmd->result
1542 * and sense buffer are assumed to be set).
1543 *
1544 * LOCKING:
1545 * spin_lock_irqsave(host_set lock)
1546 */
1547
1548 void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1549 unsigned int (*actor) (struct ata_scsi_args *args,
1550 u8 *rbuf, unsigned int buflen))
1551 {
1552 u8 *rbuf;
1553 unsigned int buflen, rc;
1554 struct scsi_cmnd *cmd = args->cmd;
1555
1556 buflen = ata_scsi_rbuf_get(cmd, &rbuf);
1557 memset(rbuf, 0, buflen);
1558 rc = actor(args, rbuf, buflen);
1559 ata_scsi_rbuf_put(cmd, rbuf);
1560
1561 if (rc == 0)
1562 cmd->result = SAM_STAT_GOOD;
1563 args->done(cmd);
1564 }
1565
1566 /**
1567 * ata_scsiop_inq_std - Simulate INQUIRY command
1568 * @args: device IDENTIFY data / SCSI command of interest.
1569 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1570 * @buflen: Response buffer length.
1571 *
1572 * Returns standard device identification data associated
1573 * with non-VPD INQUIRY command output.
1574 *
1575 * LOCKING:
1576 * spin_lock_irqsave(host_set lock)
1577 */
1578
1579 unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
1580 unsigned int buflen)
1581 {
1582 u8 hdr[] = {
1583 TYPE_DISK,
1584 0,
1585 0x5, /* claim SPC-3 version compatibility */
1586 2,
1587 95 - 4
1588 };
1589
1590 /* set scsi removeable (RMB) bit per ata bit */
1591 if (ata_id_removeable(args->id))
1592 hdr[1] |= (1 << 7);
1593
1594 VPRINTK("ENTER\n");
1595
1596 memcpy(rbuf, hdr, sizeof(hdr));
1597
1598 if (buflen > 35) {
1599 memcpy(&rbuf[8], "ATA ", 8);
1600 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD_OFS, 16);
1601 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV_OFS, 4);
1602 if (rbuf[32] == 0 || rbuf[32] == ' ')
1603 memcpy(&rbuf[32], "n/a ", 4);
1604 }
1605
1606 if (buflen > 63) {
1607 const u8 versions[] = {
1608 0x60, /* SAM-3 (no version claimed) */
1609
1610 0x03,
1611 0x20, /* SBC-2 (no version claimed) */
1612
1613 0x02,
1614 0x60 /* SPC-3 (no version claimed) */
1615 };
1616
1617 memcpy(rbuf + 59, versions, sizeof(versions));
1618 }
1619
1620 return 0;
1621 }
1622
1623 /**
1624 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1625 * @args: device IDENTIFY data / SCSI command of interest.
1626 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1627 * @buflen: Response buffer length.
1628 *
1629 * Returns list of inquiry VPD pages available.
1630 *
1631 * LOCKING:
1632 * spin_lock_irqsave(host_set lock)
1633 */
1634
1635 unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
1636 unsigned int buflen)
1637 {
1638 const u8 pages[] = {
1639 0x00, /* page 0x00, this page */
1640 0x80, /* page 0x80, unit serial no page */
1641 0x83 /* page 0x83, device ident page */
1642 };
1643 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
1644
1645 if (buflen > 6)
1646 memcpy(rbuf + 4, pages, sizeof(pages));
1647
1648 return 0;
1649 }
1650
1651 /**
1652 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1653 * @args: device IDENTIFY data / SCSI command of interest.
1654 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1655 * @buflen: Response buffer length.
1656 *
1657 * Returns ATA device serial number.
1658 *
1659 * LOCKING:
1660 * spin_lock_irqsave(host_set lock)
1661 */
1662
1663 unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
1664 unsigned int buflen)
1665 {
1666 const u8 hdr[] = {
1667 0,
1668 0x80, /* this page code */
1669 0,
1670 ATA_SERNO_LEN, /* page len */
1671 };
1672 memcpy(rbuf, hdr, sizeof(hdr));
1673
1674 if (buflen > (ATA_SERNO_LEN + 4 - 1))
1675 ata_id_string(args->id, (unsigned char *) &rbuf[4],
1676 ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
1677
1678 return 0;
1679 }
1680
1681 /**
1682 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1683 * @args: device IDENTIFY data / SCSI command of interest.
1684 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1685 * @buflen: Response buffer length.
1686 *
1687 * Yields two logical unit device identification designators:
1688 * - vendor specific ASCII containing the ATA serial number
1689 * - SAT defined "t10 vendor id based" containing ASCII vendor
1690 * name ("ATA "), model and serial numbers.
1691 *
1692 * LOCKING:
1693 * spin_lock_irqsave(host_set lock)
1694 */
1695
1696 unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
1697 unsigned int buflen)
1698 {
1699 int num;
1700 const int sat_model_serial_desc_len = 68;
1701 const int ata_model_byte_len = 40;
1702
1703 rbuf[1] = 0x83; /* this page code */
1704 num = 4;
1705
1706 if (buflen > (ATA_SERNO_LEN + num + 3)) {
1707 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
1708 rbuf[num + 0] = 2;
1709 rbuf[num + 3] = ATA_SERNO_LEN;
1710 num += 4;
1711 ata_id_string(args->id, (unsigned char *) rbuf + num,
1712 ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
1713 num += ATA_SERNO_LEN;
1714 }
1715 if (buflen > (sat_model_serial_desc_len + num + 3)) {
1716 /* SAT defined lu model and serial numbers descriptor */
1717 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
1718 rbuf[num + 0] = 2;
1719 rbuf[num + 1] = 1;
1720 rbuf[num + 3] = sat_model_serial_desc_len;
1721 num += 4;
1722 memcpy(rbuf + num, "ATA ", 8);
1723 num += 8;
1724 ata_id_string(args->id, (unsigned char *) rbuf + num,
1725 ATA_ID_PROD_OFS, ata_model_byte_len);
1726 num += ata_model_byte_len;
1727 ata_id_string(args->id, (unsigned char *) rbuf + num,
1728 ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
1729 num += ATA_SERNO_LEN;
1730 }
1731 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
1732 return 0;
1733 }
1734
1735 /**
1736 * ata_scsiop_noop - Command handler that simply returns success.
1737 * @args: device IDENTIFY data / SCSI command of interest.
1738 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1739 * @buflen: Response buffer length.
1740 *
1741 * No operation. Simply returns success to caller, to indicate
1742 * that the caller should successfully complete this SCSI command.
1743 *
1744 * LOCKING:
1745 * spin_lock_irqsave(host_set lock)
1746 */
1747
1748 unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
1749 unsigned int buflen)
1750 {
1751 VPRINTK("ENTER\n");
1752 return 0;
1753 }
1754
1755 /**
1756 * ata_msense_push - Push data onto MODE SENSE data output buffer
1757 * @ptr_io: (input/output) Location to store more output data
1758 * @last: End of output data buffer
1759 * @buf: Pointer to BLOB being added to output buffer
1760 * @buflen: Length of BLOB
1761 *
1762 * Store MODE SENSE data on an output buffer.
1763 *
1764 * LOCKING:
1765 * None.
1766 */
1767
1768 static void ata_msense_push(u8 **ptr_io, const u8 *last,
1769 const u8 *buf, unsigned int buflen)
1770 {
1771 u8 *ptr = *ptr_io;
1772
1773 if ((ptr + buflen - 1) > last)
1774 return;
1775
1776 memcpy(ptr, buf, buflen);
1777
1778 ptr += buflen;
1779
1780 *ptr_io = ptr;
1781 }
1782
1783 /**
1784 * ata_msense_caching - Simulate MODE SENSE caching info page
1785 * @id: device IDENTIFY data
1786 * @ptr_io: (input/output) Location to store more output data
1787 * @last: End of output data buffer
1788 *
1789 * Generate a caching info page, which conditionally indicates
1790 * write caching to the SCSI layer, depending on device
1791 * capabilities.
1792 *
1793 * LOCKING:
1794 * None.
1795 */
1796
1797 static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io,
1798 const u8 *last)
1799 {
1800 u8 page[CACHE_MPAGE_LEN];
1801
1802 memcpy(page, def_cache_mpage, sizeof(page));
1803 if (ata_id_wcache_enabled(id))
1804 page[2] |= (1 << 2); /* write cache enable */
1805 if (!ata_id_rahead_enabled(id))
1806 page[12] |= (1 << 5); /* disable read ahead */
1807
1808 ata_msense_push(ptr_io, last, page, sizeof(page));
1809 return sizeof(page);
1810 }
1811
1812 /**
1813 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
1814 * @dev: Device associated with this MODE SENSE command
1815 * @ptr_io: (input/output) Location to store more output data
1816 * @last: End of output data buffer
1817 *
1818 * Generate a generic MODE SENSE control mode page.
1819 *
1820 * LOCKING:
1821 * None.
1822 */
1823
1824 static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last)
1825 {
1826 ata_msense_push(ptr_io, last, def_control_mpage,
1827 sizeof(def_control_mpage));
1828 return sizeof(def_control_mpage);
1829 }
1830
1831 /**
1832 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
1833 * @dev: Device associated with this MODE SENSE command
1834 * @ptr_io: (input/output) Location to store more output data
1835 * @last: End of output data buffer
1836 *
1837 * Generate a generic MODE SENSE r/w error recovery page.
1838 *
1839 * LOCKING:
1840 * None.
1841 */
1842
1843 static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
1844 {
1845
1846 ata_msense_push(ptr_io, last, def_rw_recovery_mpage,
1847 sizeof(def_rw_recovery_mpage));
1848 return sizeof(def_rw_recovery_mpage);
1849 }
1850
1851 /*
1852 * We can turn this into a real blacklist if it's needed, for now just
1853 * blacklist any Maxtor BANC1G10 revision firmware
1854 */
1855 static int ata_dev_supports_fua(u16 *id)
1856 {
1857 unsigned char model[41], fw[9];
1858
1859 if (!libata_fua)
1860 return 0;
1861 if (!ata_id_has_fua(id))
1862 return 0;
1863
1864 ata_id_c_string(id, model, ATA_ID_PROD_OFS, sizeof(model));
1865 ata_id_c_string(id, fw, ATA_ID_FW_REV_OFS, sizeof(fw));
1866
1867 if (strcmp(model, "Maxtor"))
1868 return 1;
1869 if (strcmp(fw, "BANC1G10"))
1870 return 1;
1871
1872 return 0; /* blacklisted */
1873 }
1874
1875 /**
1876 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
1877 * @args: device IDENTIFY data / SCSI command of interest.
1878 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1879 * @buflen: Response buffer length.
1880 *
1881 * Simulate MODE SENSE commands. Assume this is invoked for direct
1882 * access devices (e.g. disks) only. There should be no block
1883 * descriptor for other device types.
1884 *
1885 * LOCKING:
1886 * spin_lock_irqsave(host_set lock)
1887 */
1888
1889 unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
1890 unsigned int buflen)
1891 {
1892 struct ata_device *dev = args->dev;
1893 u8 *scsicmd = args->cmd->cmnd, *p, *last;
1894 const u8 sat_blk_desc[] = {
1895 0, 0, 0, 0, /* number of blocks: sat unspecified */
1896 0,
1897 0, 0x2, 0x0 /* block length: 512 bytes */
1898 };
1899 u8 pg, spg;
1900 unsigned int ebd, page_control, six_byte, output_len, alloc_len, minlen;
1901 u8 dpofua;
1902
1903 VPRINTK("ENTER\n");
1904
1905 six_byte = (scsicmd[0] == MODE_SENSE);
1906 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
1907 /*
1908 * LLBA bit in msense(10) ignored (compliant)
1909 */
1910
1911 page_control = scsicmd[2] >> 6;
1912 switch (page_control) {
1913 case 0: /* current */
1914 break; /* supported */
1915 case 3: /* saved */
1916 goto saving_not_supp;
1917 case 1: /* changeable */
1918 case 2: /* defaults */
1919 default:
1920 goto invalid_fld;
1921 }
1922
1923 if (six_byte) {
1924 output_len = 4 + (ebd ? 8 : 0);
1925 alloc_len = scsicmd[4];
1926 } else {
1927 output_len = 8 + (ebd ? 8 : 0);
1928 alloc_len = (scsicmd[7] << 8) + scsicmd[8];
1929 }
1930 minlen = (alloc_len < buflen) ? alloc_len : buflen;
1931
1932 p = rbuf + output_len;
1933 last = rbuf + minlen - 1;
1934
1935 pg = scsicmd[2] & 0x3f;
1936 spg = scsicmd[3];
1937 /*
1938 * No mode subpages supported (yet) but asking for _all_
1939 * subpages may be valid
1940 */
1941 if (spg && (spg != ALL_SUB_MPAGES))
1942 goto invalid_fld;
1943
1944 switch(pg) {
1945 case RW_RECOVERY_MPAGE:
1946 output_len += ata_msense_rw_recovery(&p, last);
1947 break;
1948
1949 case CACHE_MPAGE:
1950 output_len += ata_msense_caching(args->id, &p, last);
1951 break;
1952
1953 case CONTROL_MPAGE: {
1954 output_len += ata_msense_ctl_mode(&p, last);
1955 break;
1956 }
1957
1958 case ALL_MPAGES:
1959 output_len += ata_msense_rw_recovery(&p, last);
1960 output_len += ata_msense_caching(args->id, &p, last);
1961 output_len += ata_msense_ctl_mode(&p, last);
1962 break;
1963
1964 default: /* invalid page code */
1965 goto invalid_fld;
1966 }
1967
1968 if (minlen < 1)
1969 return 0;
1970
1971 dpofua = 0;
1972 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
1973 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
1974 dpofua = 1 << 4;
1975
1976 if (six_byte) {
1977 output_len--;
1978 rbuf[0] = output_len;
1979 if (minlen > 2)
1980 rbuf[2] |= dpofua;
1981 if (ebd) {
1982 if (minlen > 3)
1983 rbuf[3] = sizeof(sat_blk_desc);
1984 if (minlen > 11)
1985 memcpy(rbuf + 4, sat_blk_desc,
1986 sizeof(sat_blk_desc));
1987 }
1988 } else {
1989 output_len -= 2;
1990 rbuf[0] = output_len >> 8;
1991 if (minlen > 1)
1992 rbuf[1] = output_len;
1993 if (minlen > 3)
1994 rbuf[3] |= dpofua;
1995 if (ebd) {
1996 if (minlen > 7)
1997 rbuf[7] = sizeof(sat_blk_desc);
1998 if (minlen > 15)
1999 memcpy(rbuf + 8, sat_blk_desc,
2000 sizeof(sat_blk_desc));
2001 }
2002 }
2003 return 0;
2004
2005 invalid_fld:
2006 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2007 /* "Invalid field in cbd" */
2008 return 1;
2009
2010 saving_not_supp:
2011 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2012 /* "Saving parameters not supported" */
2013 return 1;
2014 }
2015
2016 /**
2017 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2018 * @args: device IDENTIFY data / SCSI command of interest.
2019 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2020 * @buflen: Response buffer length.
2021 *
2022 * Simulate READ CAPACITY commands.
2023 *
2024 * LOCKING:
2025 * spin_lock_irqsave(host_set lock)
2026 */
2027
2028 unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
2029 unsigned int buflen)
2030 {
2031 u64 n_sectors;
2032 u32 tmp;
2033
2034 VPRINTK("ENTER\n");
2035
2036 if (ata_id_has_lba(args->id)) {
2037 if (ata_id_has_lba48(args->id))
2038 n_sectors = ata_id_u64(args->id, 100);
2039 else
2040 n_sectors = ata_id_u32(args->id, 60);
2041 } else {
2042 /* CHS default translation */
2043 n_sectors = args->id[1] * args->id[3] * args->id[6];
2044
2045 if (ata_id_current_chs_valid(args->id))
2046 /* CHS current translation */
2047 n_sectors = ata_id_u32(args->id, 57);
2048 }
2049
2050 n_sectors--; /* ATA TotalUserSectors - 1 */
2051
2052 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2053 if( n_sectors >= 0xffffffffULL )
2054 tmp = 0xffffffff ; /* Return max count on overflow */
2055 else
2056 tmp = n_sectors ;
2057
2058 /* sector count, 32-bit */
2059 rbuf[0] = tmp >> (8 * 3);
2060 rbuf[1] = tmp >> (8 * 2);
2061 rbuf[2] = tmp >> (8 * 1);
2062 rbuf[3] = tmp;
2063
2064 /* sector size */
2065 tmp = ATA_SECT_SIZE;
2066 rbuf[6] = tmp >> 8;
2067 rbuf[7] = tmp;
2068
2069 } else {
2070 /* sector count, 64-bit */
2071 tmp = n_sectors >> (8 * 4);
2072 rbuf[2] = tmp >> (8 * 3);
2073 rbuf[3] = tmp >> (8 * 2);
2074 rbuf[4] = tmp >> (8 * 1);
2075 rbuf[5] = tmp;
2076 tmp = n_sectors;
2077 rbuf[6] = tmp >> (8 * 3);
2078 rbuf[7] = tmp >> (8 * 2);
2079 rbuf[8] = tmp >> (8 * 1);
2080 rbuf[9] = tmp;
2081
2082 /* sector size */
2083 tmp = ATA_SECT_SIZE;
2084 rbuf[12] = tmp >> 8;
2085 rbuf[13] = tmp;
2086 }
2087
2088 return 0;
2089 }
2090
2091 /**
2092 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2093 * @args: device IDENTIFY data / SCSI command of interest.
2094 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2095 * @buflen: Response buffer length.
2096 *
2097 * Simulate REPORT LUNS command.
2098 *
2099 * LOCKING:
2100 * spin_lock_irqsave(host_set lock)
2101 */
2102
2103 unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
2104 unsigned int buflen)
2105 {
2106 VPRINTK("ENTER\n");
2107 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2108
2109 return 0;
2110 }
2111
2112 /**
2113 * ata_scsi_set_sense - Set SCSI sense data and status
2114 * @cmd: SCSI request to be handled
2115 * @sk: SCSI-defined sense key
2116 * @asc: SCSI-defined additional sense code
2117 * @ascq: SCSI-defined additional sense code qualifier
2118 *
2119 * Helper function that builds a valid fixed format, current
2120 * response code and the given sense key (sk), additional sense
2121 * code (asc) and additional sense code qualifier (ascq) with
2122 * a SCSI command status of %SAM_STAT_CHECK_CONDITION and
2123 * DRIVER_SENSE set in the upper bits of scsi_cmnd::result .
2124 *
2125 * LOCKING:
2126 * Not required
2127 */
2128
2129 void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
2130 {
2131 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
2132
2133 cmd->sense_buffer[0] = 0x70; /* fixed format, current */
2134 cmd->sense_buffer[2] = sk;
2135 cmd->sense_buffer[7] = 18 - 8; /* additional sense length */
2136 cmd->sense_buffer[12] = asc;
2137 cmd->sense_buffer[13] = ascq;
2138 }
2139
2140 /**
2141 * ata_scsi_badcmd - End a SCSI request with an error
2142 * @cmd: SCSI request to be handled
2143 * @done: SCSI command completion function
2144 * @asc: SCSI-defined additional sense code
2145 * @ascq: SCSI-defined additional sense code qualifier
2146 *
2147 * Helper function that completes a SCSI command with
2148 * %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST
2149 * and the specified additional sense codes.
2150 *
2151 * LOCKING:
2152 * spin_lock_irqsave(host_set lock)
2153 */
2154
2155 void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq)
2156 {
2157 DPRINTK("ENTER\n");
2158 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq);
2159
2160 done(cmd);
2161 }
2162
2163 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2164 {
2165 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2166 /* FIXME: not quite right; we don't want the
2167 * translation of taskfile registers into
2168 * a sense descriptors, since that's only
2169 * correct for ATA, not ATAPI
2170 */
2171 ata_gen_ata_desc_sense(qc);
2172 }
2173
2174 qc->scsidone(qc->scsicmd);
2175 ata_qc_free(qc);
2176 }
2177
2178 /* is it pointless to prefer PIO for "safety reasons"? */
2179 static inline int ata_pio_use_silly(struct ata_port *ap)
2180 {
2181 return (ap->flags & ATA_FLAG_PIO_DMA);
2182 }
2183
2184 static void atapi_request_sense(struct ata_queued_cmd *qc)
2185 {
2186 struct ata_port *ap = qc->ap;
2187 struct scsi_cmnd *cmd = qc->scsicmd;
2188
2189 DPRINTK("ATAPI request sense\n");
2190
2191 /* FIXME: is this needed? */
2192 memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
2193
2194 ap->ops->tf_read(ap, &qc->tf);
2195
2196 /* fill these in, for the case where they are -not- overwritten */
2197 cmd->sense_buffer[0] = 0x70;
2198 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2199
2200 ata_qc_reinit(qc);
2201
2202 ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer));
2203 qc->dma_dir = DMA_FROM_DEVICE;
2204
2205 memset(&qc->cdb, 0, qc->dev->cdb_len);
2206 qc->cdb[0] = REQUEST_SENSE;
2207 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2208
2209 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2210 qc->tf.command = ATA_CMD_PACKET;
2211
2212 if (ata_pio_use_silly(ap)) {
2213 qc->tf.protocol = ATA_PROT_ATAPI_DMA;
2214 qc->tf.feature |= ATAPI_PKT_DMA;
2215 } else {
2216 qc->tf.protocol = ATA_PROT_ATAPI;
2217 qc->tf.lbam = (8 * 1024) & 0xff;
2218 qc->tf.lbah = (8 * 1024) >> 8;
2219 }
2220 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2221
2222 qc->complete_fn = atapi_sense_complete;
2223
2224 ata_qc_issue(qc);
2225
2226 DPRINTK("EXIT\n");
2227 }
2228
2229 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2230 {
2231 struct scsi_cmnd *cmd = qc->scsicmd;
2232 unsigned int err_mask = qc->err_mask;
2233
2234 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2235
2236 /* handle completion from new EH */
2237 if (unlikely(qc->ap->ops->error_handler &&
2238 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2239
2240 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2241 /* FIXME: not quite right; we don't want the
2242 * translation of taskfile registers into a
2243 * sense descriptors, since that's only
2244 * correct for ATA, not ATAPI
2245 */
2246 ata_gen_ata_desc_sense(qc);
2247 }
2248
2249 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2250 qc->scsidone(cmd);
2251 ata_qc_free(qc);
2252 return;
2253 }
2254
2255 /* successful completion or old EH failure path */
2256 if (unlikely(err_mask & AC_ERR_DEV)) {
2257 cmd->result = SAM_STAT_CHECK_CONDITION;
2258 atapi_request_sense(qc);
2259 return;
2260 } else if (unlikely(err_mask)) {
2261 /* FIXME: not quite right; we don't want the
2262 * translation of taskfile registers into
2263 * a sense descriptors, since that's only
2264 * correct for ATA, not ATAPI
2265 */
2266 ata_gen_ata_desc_sense(qc);
2267 } else {
2268 u8 *scsicmd = cmd->cmnd;
2269
2270 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2271 u8 *buf = NULL;
2272 unsigned int buflen;
2273
2274 buflen = ata_scsi_rbuf_get(cmd, &buf);
2275
2276 /* ATAPI devices typically report zero for their SCSI version,
2277 * and sometimes deviate from the spec WRT response data
2278 * format. If SCSI version is reported as zero like normal,
2279 * then we make the following fixups: 1) Fake MMC-5 version,
2280 * to indicate to the Linux scsi midlayer this is a modern
2281 * device. 2) Ensure response data format / ATAPI information
2282 * are always correct.
2283 */
2284 if (buf[2] == 0) {
2285 buf[2] = 0x5;
2286 buf[3] = 0x32;
2287 }
2288
2289 ata_scsi_rbuf_put(cmd, buf);
2290 }
2291
2292 cmd->result = SAM_STAT_GOOD;
2293 }
2294
2295 qc->scsidone(cmd);
2296 ata_qc_free(qc);
2297 }
2298 /**
2299 * atapi_xlat - Initialize PACKET taskfile
2300 * @qc: command structure to be initialized
2301 * @scsicmd: SCSI CDB associated with this PACKET command
2302 *
2303 * LOCKING:
2304 * spin_lock_irqsave(host_set lock)
2305 *
2306 * RETURNS:
2307 * Zero on success, non-zero on failure.
2308 */
2309
2310 static unsigned int atapi_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
2311 {
2312 struct scsi_cmnd *cmd = qc->scsicmd;
2313 struct ata_device *dev = qc->dev;
2314 int using_pio = (dev->flags & ATA_DFLAG_PIO);
2315 int nodata = (cmd->sc_data_direction == DMA_NONE);
2316
2317 if (!using_pio)
2318 /* Check whether ATAPI DMA is safe */
2319 if (ata_check_atapi_dma(qc))
2320 using_pio = 1;
2321
2322 memcpy(&qc->cdb, scsicmd, dev->cdb_len);
2323
2324 qc->complete_fn = atapi_qc_complete;
2325
2326 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2327 if (cmd->sc_data_direction == DMA_TO_DEVICE) {
2328 qc->tf.flags |= ATA_TFLAG_WRITE;
2329 DPRINTK("direction: write\n");
2330 }
2331
2332 qc->tf.command = ATA_CMD_PACKET;
2333
2334 /* no data, or PIO data xfer */
2335 if (using_pio || nodata) {
2336 if (nodata)
2337 qc->tf.protocol = ATA_PROT_ATAPI_NODATA;
2338 else
2339 qc->tf.protocol = ATA_PROT_ATAPI;
2340 qc->tf.lbam = (8 * 1024) & 0xff;
2341 qc->tf.lbah = (8 * 1024) >> 8;
2342 }
2343
2344 /* DMA data xfer */
2345 else {
2346 qc->tf.protocol = ATA_PROT_ATAPI_DMA;
2347 qc->tf.feature |= ATAPI_PKT_DMA;
2348
2349 if (atapi_dmadir && (cmd->sc_data_direction != DMA_TO_DEVICE))
2350 /* some SATA bridges need us to indicate data xfer direction */
2351 qc->tf.feature |= ATAPI_DMADIR;
2352 }
2353
2354 qc->nbytes = cmd->request_bufflen;
2355
2356 return 0;
2357 }
2358
2359 static struct ata_device * ata_find_dev(struct ata_port *ap, int id)
2360 {
2361 if (likely(id < ATA_MAX_DEVICES))
2362 return &ap->device[id];
2363 return NULL;
2364 }
2365
2366 static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
2367 const struct scsi_device *scsidev)
2368 {
2369 /* skip commands not addressed to targets we simulate */
2370 if (unlikely(scsidev->channel || scsidev->lun))
2371 return NULL;
2372
2373 return ata_find_dev(ap, scsidev->id);
2374 }
2375
2376 /**
2377 * ata_scsi_dev_enabled - determine if device is enabled
2378 * @dev: ATA device
2379 *
2380 * Determine if commands should be sent to the specified device.
2381 *
2382 * LOCKING:
2383 * spin_lock_irqsave(host_set lock)
2384 *
2385 * RETURNS:
2386 * 0 if commands are not allowed / 1 if commands are allowed
2387 */
2388
2389 static int ata_scsi_dev_enabled(struct ata_device *dev)
2390 {
2391 if (unlikely(!ata_dev_enabled(dev)))
2392 return 0;
2393
2394 if (!atapi_enabled || (dev->ap->flags & ATA_FLAG_NO_ATAPI)) {
2395 if (unlikely(dev->class == ATA_DEV_ATAPI)) {
2396 ata_dev_printk(dev, KERN_WARNING,
2397 "WARNING: ATAPI is %s, device ignored.\n",
2398 atapi_enabled ? "not supported with this driver" : "disabled");
2399 return 0;
2400 }
2401 }
2402
2403 return 1;
2404 }
2405
2406 /**
2407 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2408 * @ap: ATA port to which the device is attached
2409 * @scsidev: SCSI device from which we derive the ATA device
2410 *
2411 * Given various information provided in struct scsi_cmnd,
2412 * map that onto an ATA bus, and using that mapping
2413 * determine which ata_device is associated with the
2414 * SCSI command to be sent.
2415 *
2416 * LOCKING:
2417 * spin_lock_irqsave(host_set lock)
2418 *
2419 * RETURNS:
2420 * Associated ATA device, or %NULL if not found.
2421 */
2422 static struct ata_device *
2423 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2424 {
2425 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2426
2427 if (unlikely(!dev || !ata_scsi_dev_enabled(dev)))
2428 return NULL;
2429
2430 return dev;
2431 }
2432
2433 /*
2434 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2435 * @byte1: Byte 1 from pass-thru CDB.
2436 *
2437 * RETURNS:
2438 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2439 */
2440 static u8
2441 ata_scsi_map_proto(u8 byte1)
2442 {
2443 switch((byte1 & 0x1e) >> 1) {
2444 case 3: /* Non-data */
2445 return ATA_PROT_NODATA;
2446
2447 case 6: /* DMA */
2448 return ATA_PROT_DMA;
2449
2450 case 4: /* PIO Data-in */
2451 case 5: /* PIO Data-out */
2452 return ATA_PROT_PIO;
2453
2454 case 10: /* Device Reset */
2455 case 0: /* Hard Reset */
2456 case 1: /* SRST */
2457 case 2: /* Bus Idle */
2458 case 7: /* Packet */
2459 case 8: /* DMA Queued */
2460 case 9: /* Device Diagnostic */
2461 case 11: /* UDMA Data-in */
2462 case 12: /* UDMA Data-Out */
2463 case 13: /* FPDMA */
2464 default: /* Reserved */
2465 break;
2466 }
2467
2468 return ATA_PROT_UNKNOWN;
2469 }
2470
2471 /**
2472 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2473 * @qc: command structure to be initialized
2474 * @scsicmd: SCSI command to convert
2475 *
2476 * Handles either 12 or 16-byte versions of the CDB.
2477 *
2478 * RETURNS:
2479 * Zero on success, non-zero on failure.
2480 */
2481 static unsigned int
2482 ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *scsicmd)
2483 {
2484 struct ata_taskfile *tf = &(qc->tf);
2485 struct scsi_cmnd *cmd = qc->scsicmd;
2486 struct ata_device *dev = qc->dev;
2487
2488 if ((tf->protocol = ata_scsi_map_proto(scsicmd[1])) == ATA_PROT_UNKNOWN)
2489 goto invalid_fld;
2490
2491 /* We may not issue DMA commands if no DMA mode is set */
2492 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2493 goto invalid_fld;
2494
2495 if (scsicmd[1] & 0xe0)
2496 /* PIO multi not supported yet */
2497 goto invalid_fld;
2498
2499 /*
2500 * 12 and 16 byte CDBs use different offsets to
2501 * provide the various register values.
2502 */
2503 if (scsicmd[0] == ATA_16) {
2504 /*
2505 * 16-byte CDB - may contain extended commands.
2506 *
2507 * If that is the case, copy the upper byte register values.
2508 */
2509 if (scsicmd[1] & 0x01) {
2510 tf->hob_feature = scsicmd[3];
2511 tf->hob_nsect = scsicmd[5];
2512 tf->hob_lbal = scsicmd[7];
2513 tf->hob_lbam = scsicmd[9];
2514 tf->hob_lbah = scsicmd[11];
2515 tf->flags |= ATA_TFLAG_LBA48;
2516 } else
2517 tf->flags &= ~ATA_TFLAG_LBA48;
2518
2519 /*
2520 * Always copy low byte, device and command registers.
2521 */
2522 tf->feature = scsicmd[4];
2523 tf->nsect = scsicmd[6];
2524 tf->lbal = scsicmd[8];
2525 tf->lbam = scsicmd[10];
2526 tf->lbah = scsicmd[12];
2527 tf->device = scsicmd[13];
2528 tf->command = scsicmd[14];
2529 } else {
2530 /*
2531 * 12-byte CDB - incapable of extended commands.
2532 */
2533 tf->flags &= ~ATA_TFLAG_LBA48;
2534
2535 tf->feature = scsicmd[3];
2536 tf->nsect = scsicmd[4];
2537 tf->lbal = scsicmd[5];
2538 tf->lbam = scsicmd[6];
2539 tf->lbah = scsicmd[7];
2540 tf->device = scsicmd[8];
2541 tf->command = scsicmd[9];
2542 }
2543 /*
2544 * If slave is possible, enforce correct master/slave bit
2545 */
2546 if (qc->ap->flags & ATA_FLAG_SLAVE_POSS)
2547 tf->device = qc->dev->devno ?
2548 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2549
2550 /*
2551 * Filter SET_FEATURES - XFER MODE command -- otherwise,
2552 * SET_FEATURES - XFER MODE must be preceded/succeeded
2553 * by an update to hardware-specific registers for each
2554 * controller (i.e. the reason for ->set_piomode(),
2555 * ->set_dmamode(), and ->post_set_mode() hooks).
2556 */
2557 if ((tf->command == ATA_CMD_SET_FEATURES)
2558 && (tf->feature == SETFEATURES_XFER))
2559 goto invalid_fld;
2560
2561 /*
2562 * Set flags so that all registers will be written,
2563 * and pass on write indication (used for PIO/DMA
2564 * setup.)
2565 */
2566 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
2567
2568 if (cmd->sc_data_direction == DMA_TO_DEVICE)
2569 tf->flags |= ATA_TFLAG_WRITE;
2570
2571 /*
2572 * Set transfer length.
2573 *
2574 * TODO: find out if we need to do more here to
2575 * cover scatter/gather case.
2576 */
2577 qc->nsect = cmd->request_bufflen / ATA_SECT_SIZE;
2578
2579 /* request result TF */
2580 qc->flags |= ATA_QCFLAG_RESULT_TF;
2581
2582 return 0;
2583
2584 invalid_fld:
2585 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x00);
2586 /* "Invalid field in cdb" */
2587 return 1;
2588 }
2589
2590 /**
2591 * ata_get_xlat_func - check if SCSI to ATA translation is possible
2592 * @dev: ATA device
2593 * @cmd: SCSI command opcode to consider
2594 *
2595 * Look up the SCSI command given, and determine whether the
2596 * SCSI command is to be translated or simulated.
2597 *
2598 * RETURNS:
2599 * Pointer to translation function if possible, %NULL if not.
2600 */
2601
2602 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
2603 {
2604 switch (cmd) {
2605 case READ_6:
2606 case READ_10:
2607 case READ_16:
2608
2609 case WRITE_6:
2610 case WRITE_10:
2611 case WRITE_16:
2612 return ata_scsi_rw_xlat;
2613
2614 case SYNCHRONIZE_CACHE:
2615 if (ata_try_flush_cache(dev))
2616 return ata_scsi_flush_xlat;
2617 break;
2618
2619 case VERIFY:
2620 case VERIFY_16:
2621 return ata_scsi_verify_xlat;
2622
2623 case ATA_12:
2624 case ATA_16:
2625 return ata_scsi_pass_thru;
2626
2627 case START_STOP:
2628 return ata_scsi_start_stop_xlat;
2629 }
2630
2631 return NULL;
2632 }
2633
2634 /**
2635 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
2636 * @ap: ATA port to which the command was being sent
2637 * @cmd: SCSI command to dump
2638 *
2639 * Prints the contents of a SCSI command via printk().
2640 */
2641
2642 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
2643 struct scsi_cmnd *cmd)
2644 {
2645 #ifdef ATA_DEBUG
2646 struct scsi_device *scsidev = cmd->device;
2647 u8 *scsicmd = cmd->cmnd;
2648
2649 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
2650 ap->id,
2651 scsidev->channel, scsidev->id, scsidev->lun,
2652 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
2653 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
2654 scsicmd[8]);
2655 #endif
2656 }
2657
2658 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *cmd,
2659 void (*done)(struct scsi_cmnd *),
2660 struct ata_device *dev)
2661 {
2662 int rc = 0;
2663
2664 if (dev->class == ATA_DEV_ATA) {
2665 ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
2666 cmd->cmnd[0]);
2667
2668 if (xlat_func)
2669 rc = ata_scsi_translate(dev, cmd, done, xlat_func);
2670 else
2671 ata_scsi_simulate(dev, cmd, done);
2672 } else
2673 rc = ata_scsi_translate(dev, cmd, done, atapi_xlat);
2674
2675 return rc;
2676 }
2677
2678 /**
2679 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
2680 * @cmd: SCSI command to be sent
2681 * @done: Completion function, called when command is complete
2682 *
2683 * In some cases, this function translates SCSI commands into
2684 * ATA taskfiles, and queues the taskfiles to be sent to
2685 * hardware. In other cases, this function simulates a
2686 * SCSI device by evaluating and responding to certain
2687 * SCSI commands. This creates the overall effect of
2688 * ATA and ATAPI devices appearing as SCSI devices.
2689 *
2690 * LOCKING:
2691 * Releases scsi-layer-held lock, and obtains host_set lock.
2692 *
2693 * RETURNS:
2694 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
2695 * 0 otherwise.
2696 */
2697 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
2698 {
2699 struct ata_port *ap;
2700 struct ata_device *dev;
2701 struct scsi_device *scsidev = cmd->device;
2702 struct Scsi_Host *shost = scsidev->host;
2703 int rc = 0;
2704
2705 ap = ata_shost_to_port(shost);
2706
2707 spin_unlock(shost->host_lock);
2708 spin_lock(ap->lock);
2709
2710 ata_scsi_dump_cdb(ap, cmd);
2711
2712 dev = ata_scsi_find_dev(ap, scsidev);
2713 if (likely(dev))
2714 rc = __ata_scsi_queuecmd(cmd, done, dev);
2715 else {
2716 cmd->result = (DID_BAD_TARGET << 16);
2717 done(cmd);
2718 }
2719
2720 spin_unlock(ap->lock);
2721 spin_lock(shost->host_lock);
2722 return rc;
2723 }
2724
2725 /**
2726 * ata_scsi_simulate - simulate SCSI command on ATA device
2727 * @dev: the target device
2728 * @cmd: SCSI command being sent to device.
2729 * @done: SCSI command completion function.
2730 *
2731 * Interprets and directly executes a select list of SCSI commands
2732 * that can be handled internally.
2733 *
2734 * LOCKING:
2735 * spin_lock_irqsave(host_set lock)
2736 */
2737
2738 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
2739 void (*done)(struct scsi_cmnd *))
2740 {
2741 struct ata_scsi_args args;
2742 const u8 *scsicmd = cmd->cmnd;
2743
2744 args.dev = dev;
2745 args.id = dev->id;
2746 args.cmd = cmd;
2747 args.done = done;
2748
2749 switch(scsicmd[0]) {
2750 /* no-op's, complete with success */
2751 case SYNCHRONIZE_CACHE:
2752 case REZERO_UNIT:
2753 case SEEK_6:
2754 case SEEK_10:
2755 case TEST_UNIT_READY:
2756 case FORMAT_UNIT: /* FIXME: correct? */
2757 case SEND_DIAGNOSTIC: /* FIXME: correct? */
2758 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
2759 break;
2760
2761 case INQUIRY:
2762 if (scsicmd[1] & 2) /* is CmdDt set? */
2763 ata_scsi_invalid_field(cmd, done);
2764 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
2765 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
2766 else if (scsicmd[2] == 0x00)
2767 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
2768 else if (scsicmd[2] == 0x80)
2769 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
2770 else if (scsicmd[2] == 0x83)
2771 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
2772 else
2773 ata_scsi_invalid_field(cmd, done);
2774 break;
2775
2776 case MODE_SENSE:
2777 case MODE_SENSE_10:
2778 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
2779 break;
2780
2781 case MODE_SELECT: /* unconditionally return */
2782 case MODE_SELECT_10: /* bad-field-in-cdb */
2783 ata_scsi_invalid_field(cmd, done);
2784 break;
2785
2786 case READ_CAPACITY:
2787 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2788 break;
2789
2790 case SERVICE_ACTION_IN:
2791 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
2792 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2793 else
2794 ata_scsi_invalid_field(cmd, done);
2795 break;
2796
2797 case REPORT_LUNS:
2798 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
2799 break;
2800
2801 /* mandatory commands we haven't implemented yet */
2802 case REQUEST_SENSE:
2803
2804 /* all other commands */
2805 default:
2806 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
2807 /* "Invalid command operation code" */
2808 done(cmd);
2809 break;
2810 }
2811 }
2812
2813 void ata_scsi_scan_host(struct ata_port *ap)
2814 {
2815 unsigned int i;
2816
2817 if (ap->flags & ATA_FLAG_DISABLED)
2818 return;
2819
2820 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2821 struct ata_device *dev = &ap->device[i];
2822 struct scsi_device *sdev;
2823
2824 if (!ata_dev_enabled(dev) || dev->sdev)
2825 continue;
2826
2827 sdev = __scsi_add_device(ap->host, 0, i, 0, NULL);
2828 if (!IS_ERR(sdev)) {
2829 dev->sdev = sdev;
2830 scsi_device_put(sdev);
2831 }
2832 }
2833 }
2834
2835 /**
2836 * ata_scsi_offline_dev - offline attached SCSI device
2837 * @dev: ATA device to offline attached SCSI device for
2838 *
2839 * This function is called from ata_eh_hotplug() and responsible
2840 * for taking the SCSI device attached to @dev offline. This
2841 * function is called with host_set lock which protects dev->sdev
2842 * against clearing.
2843 *
2844 * LOCKING:
2845 * spin_lock_irqsave(host_set lock)
2846 *
2847 * RETURNS:
2848 * 1 if attached SCSI device exists, 0 otherwise.
2849 */
2850 int ata_scsi_offline_dev(struct ata_device *dev)
2851 {
2852 if (dev->sdev) {
2853 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
2854 return 1;
2855 }
2856 return 0;
2857 }
2858
2859 /**
2860 * ata_scsi_remove_dev - remove attached SCSI device
2861 * @dev: ATA device to remove attached SCSI device for
2862 *
2863 * This function is called from ata_eh_scsi_hotplug() and
2864 * responsible for removing the SCSI device attached to @dev.
2865 *
2866 * LOCKING:
2867 * Kernel thread context (may sleep).
2868 */
2869 static void ata_scsi_remove_dev(struct ata_device *dev)
2870 {
2871 struct ata_port *ap = dev->ap;
2872 struct scsi_device *sdev;
2873 unsigned long flags;
2874
2875 /* Alas, we need to grab scan_mutex to ensure SCSI device
2876 * state doesn't change underneath us and thus
2877 * scsi_device_get() always succeeds. The mutex locking can
2878 * be removed if there is __scsi_device_get() interface which
2879 * increments reference counts regardless of device state.
2880 */
2881 mutex_lock(&ap->host->scan_mutex);
2882 spin_lock_irqsave(ap->lock, flags);
2883
2884 /* clearing dev->sdev is protected by host_set lock */
2885 sdev = dev->sdev;
2886 dev->sdev = NULL;
2887
2888 if (sdev) {
2889 /* If user initiated unplug races with us, sdev can go
2890 * away underneath us after the host_set lock and
2891 * scan_mutex are released. Hold onto it.
2892 */
2893 if (scsi_device_get(sdev) == 0) {
2894 /* The following ensures the attached sdev is
2895 * offline on return from ata_scsi_offline_dev()
2896 * regardless it wins or loses the race
2897 * against this function.
2898 */
2899 scsi_device_set_state(sdev, SDEV_OFFLINE);
2900 } else {
2901 WARN_ON(1);
2902 sdev = NULL;
2903 }
2904 }
2905
2906 spin_unlock_irqrestore(ap->lock, flags);
2907 mutex_unlock(&ap->host->scan_mutex);
2908
2909 if (sdev) {
2910 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
2911 sdev->sdev_gendev.bus_id);
2912
2913 scsi_remove_device(sdev);
2914 scsi_device_put(sdev);
2915 }
2916 }
2917
2918 /**
2919 * ata_scsi_hotplug - SCSI part of hotplug
2920 * @data: Pointer to ATA port to perform SCSI hotplug on
2921 *
2922 * Perform SCSI part of hotplug. It's executed from a separate
2923 * workqueue after EH completes. This is necessary because SCSI
2924 * hot plugging requires working EH and hot unplugging is
2925 * synchronized with hot plugging with a mutex.
2926 *
2927 * LOCKING:
2928 * Kernel thread context (may sleep).
2929 */
2930 void ata_scsi_hotplug(void *data)
2931 {
2932 struct ata_port *ap = data;
2933 int i;
2934
2935 if (ap->flags & ATA_FLAG_UNLOADING) {
2936 DPRINTK("ENTER/EXIT - unloading\n");
2937 return;
2938 }
2939
2940 DPRINTK("ENTER\n");
2941
2942 /* unplug detached devices */
2943 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2944 struct ata_device *dev = &ap->device[i];
2945 unsigned long flags;
2946
2947 if (!(dev->flags & ATA_DFLAG_DETACHED))
2948 continue;
2949
2950 spin_lock_irqsave(ap->lock, flags);
2951 dev->flags &= ~ATA_DFLAG_DETACHED;
2952 spin_unlock_irqrestore(ap->lock, flags);
2953
2954 ata_scsi_remove_dev(dev);
2955 }
2956
2957 /* scan for new ones */
2958 ata_scsi_scan_host(ap);
2959
2960 /* If we scanned while EH was in progress, scan would have
2961 * failed silently. Requeue if there are enabled but
2962 * unattached devices.
2963 */
2964 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2965 struct ata_device *dev = &ap->device[i];
2966 if (ata_dev_enabled(dev) && !dev->sdev) {
2967 queue_delayed_work(ata_aux_wq, &ap->hotplug_task, HZ);
2968 break;
2969 }
2970 }
2971
2972 DPRINTK("EXIT\n");
2973 }
2974
2975 /**
2976 * ata_scsi_user_scan - indication for user-initiated bus scan
2977 * @shost: SCSI host to scan
2978 * @channel: Channel to scan
2979 * @id: ID to scan
2980 * @lun: LUN to scan
2981 *
2982 * This function is called when user explicitly requests bus
2983 * scan. Set probe pending flag and invoke EH.
2984 *
2985 * LOCKING:
2986 * SCSI layer (we don't care)
2987 *
2988 * RETURNS:
2989 * Zero.
2990 */
2991 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
2992 unsigned int id, unsigned int lun)
2993 {
2994 struct ata_port *ap = ata_shost_to_port(shost);
2995 unsigned long flags;
2996 int rc = 0;
2997
2998 if (!ap->ops->error_handler)
2999 return -EOPNOTSUPP;
3000
3001 if ((channel != SCAN_WILD_CARD && channel != 0) ||
3002 (lun != SCAN_WILD_CARD && lun != 0))
3003 return -EINVAL;
3004
3005 spin_lock_irqsave(ap->lock, flags);
3006
3007 if (id == SCAN_WILD_CARD) {
3008 ap->eh_info.probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
3009 ap->eh_info.action |= ATA_EH_SOFTRESET;
3010 } else {
3011 struct ata_device *dev = ata_find_dev(ap, id);
3012
3013 if (dev) {
3014 ap->eh_info.probe_mask |= 1 << dev->devno;
3015 ap->eh_info.action |= ATA_EH_SOFTRESET;
3016 } else
3017 rc = -EINVAL;
3018 }
3019
3020 if (rc == 0)
3021 ata_port_schedule_eh(ap);
3022
3023 spin_unlock_irqrestore(ap->lock, flags);
3024
3025 return rc;
3026 }
3027
3028 /**
3029 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3030 * @data: Pointer to ATA port to perform scsi_rescan_device()
3031 *
3032 * After ATA pass thru (SAT) commands are executed successfully,
3033 * libata need to propagate the changes to SCSI layer. This
3034 * function must be executed from ata_aux_wq such that sdev
3035 * attach/detach don't race with rescan.
3036 *
3037 * LOCKING:
3038 * Kernel thread context (may sleep).
3039 */
3040 void ata_scsi_dev_rescan(void *data)
3041 {
3042 struct ata_port *ap = data;
3043 struct ata_device *dev;
3044 unsigned int i;
3045
3046 for (i = 0; i < ATA_MAX_DEVICES; i++) {
3047 dev = &ap->device[i];
3048
3049 if (ata_dev_enabled(dev) && dev->sdev)
3050 scsi_rescan_device(&(dev->sdev->sdev_gendev));
3051 }
3052 }
linux v2.6.22.y-op