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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / ata / libata-scsi.c
blobef8567de6a7515b45631f4a06f3447fe0604f0b3
1 /*
2 * libata-scsi.c - helper library for ATA
3 *
4 * Maintained by: Tejun Heo <tj@kernel.org>
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/slab.h>
37 #include <linux/kernel.h>
38 #include <linux/blkdev.h>
39 #include <linux/spinlock.h>
40 #include <linux/export.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_eh.h>
45 #include <scsi/scsi_device.h>
46 #include <scsi/scsi_tcq.h>
47 #include <scsi/scsi_transport.h>
48 #include <linux/libata.h>
49 #include <linux/hdreg.h>
50 #include <linux/uaccess.h>
51 #include <linux/suspend.h>
52 #include <asm/unaligned.h>
53
54 #include "libata.h"
55 #include "libata-transport.h"
56
57 #define ATA_SCSI_RBUF_SIZE 4096
58
59 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
60 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
61
62 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
63
64 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
65 const struct scsi_device *scsidev);
66 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
67 const struct scsi_device *scsidev);
68
69 #define RW_RECOVERY_MPAGE 0x1
70 #define RW_RECOVERY_MPAGE_LEN 12
71 #define CACHE_MPAGE 0x8
72 #define CACHE_MPAGE_LEN 20
73 #define CONTROL_MPAGE 0xa
74 #define CONTROL_MPAGE_LEN 12
75 #define ALL_MPAGES 0x3f
76 #define ALL_SUB_MPAGES 0xff
77
78
79 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
80 RW_RECOVERY_MPAGE,
81 RW_RECOVERY_MPAGE_LEN - 2,
82 (1 << 7), /* AWRE */
83 0, /* read retry count */
84 0, 0, 0, 0,
85 0, /* write retry count */
86 0, 0, 0
87 };
88
89 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
90 CACHE_MPAGE,
91 CACHE_MPAGE_LEN - 2,
92 0, /* contains WCE, needs to be 0 for logic */
93 0, 0, 0, 0, 0, 0, 0, 0, 0,
94 0, /* contains DRA, needs to be 0 for logic */
95 0, 0, 0, 0, 0, 0, 0
96 };
97
98 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
99 CONTROL_MPAGE,
100 CONTROL_MPAGE_LEN - 2,
101 2, /* DSENSE=0, GLTSD=1 */
102 0, /* [QAM+QERR may be 1, see 05-359r1] */
103 0, 0, 0, 0, 0xff, 0xff,
104 0, 30 /* extended self test time, see 05-359r1 */
105 };
106
107 static const char *ata_lpm_policy_names[] = {
108 [ATA_LPM_UNKNOWN] = "max_performance",
109 [ATA_LPM_MAX_POWER] = "max_performance",
110 [ATA_LPM_MED_POWER] = "medium_power",
111 [ATA_LPM_MIN_POWER] = "min_power",
112 };
113
114 static ssize_t ata_scsi_lpm_store(struct device *device,
115 struct device_attribute *attr,
116 const char *buf, size_t count)
117 {
118 struct Scsi_Host *shost = class_to_shost(device);
119 struct ata_port *ap = ata_shost_to_port(shost);
120 struct ata_link *link;
121 struct ata_device *dev;
122 enum ata_lpm_policy policy;
123 unsigned long flags;
124
125 /* UNKNOWN is internal state, iterate from MAX_POWER */
126 for (policy = ATA_LPM_MAX_POWER;
127 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
128 const char *name = ata_lpm_policy_names[policy];
129
130 if (strncmp(name, buf, strlen(name)) == 0)
131 break;
132 }
133 if (policy == ARRAY_SIZE(ata_lpm_policy_names))
134 return -EINVAL;
135
136 spin_lock_irqsave(ap->lock, flags);
137
138 ata_for_each_link(link, ap, EDGE) {
139 ata_for_each_dev(dev, &ap->link, ENABLED) {
140 if (dev->horkage & ATA_HORKAGE_NOLPM) {
141 count = -EOPNOTSUPP;
142 goto out_unlock;
143 }
144 }
145 }
146
147 ap->target_lpm_policy = policy;
148 ata_port_schedule_eh(ap);
149 out_unlock:
150 spin_unlock_irqrestore(ap->lock, flags);
151 return count;
152 }
153
154 static ssize_t ata_scsi_lpm_show(struct device *dev,
155 struct device_attribute *attr, char *buf)
156 {
157 struct Scsi_Host *shost = class_to_shost(dev);
158 struct ata_port *ap = ata_shost_to_port(shost);
159
160 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
161 return -EINVAL;
162
163 return snprintf(buf, PAGE_SIZE, "%s\n",
164 ata_lpm_policy_names[ap->target_lpm_policy]);
165 }
166 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
167 ata_scsi_lpm_show, ata_scsi_lpm_store);
168 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
169
170 static ssize_t ata_scsi_park_show(struct device *device,
171 struct device_attribute *attr, char *buf)
172 {
173 struct scsi_device *sdev = to_scsi_device(device);
174 struct ata_port *ap;
175 struct ata_link *link;
176 struct ata_device *dev;
177 unsigned long flags, now;
178 unsigned int uninitialized_var(msecs);
179 int rc = 0;
180
181 ap = ata_shost_to_port(sdev->host);
182
183 spin_lock_irqsave(ap->lock, flags);
184 dev = ata_scsi_find_dev(ap, sdev);
185 if (!dev) {
186 rc = -ENODEV;
187 goto unlock;
188 }
189 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
190 rc = -EOPNOTSUPP;
191 goto unlock;
192 }
193
194 link = dev->link;
195 now = jiffies;
196 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
197 link->eh_context.unloaded_mask & (1 << dev->devno) &&
198 time_after(dev->unpark_deadline, now))
199 msecs = jiffies_to_msecs(dev->unpark_deadline - now);
200 else
201 msecs = 0;
202
203 unlock:
204 spin_unlock_irq(ap->lock);
205
206 return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
207 }
208
209 static ssize_t ata_scsi_park_store(struct device *device,
210 struct device_attribute *attr,
211 const char *buf, size_t len)
212 {
213 struct scsi_device *sdev = to_scsi_device(device);
214 struct ata_port *ap;
215 struct ata_device *dev;
216 long int input;
217 unsigned long flags;
218 int rc;
219
220 rc = kstrtol(buf, 10, &input);
221 if (rc)
222 return rc;
223 if (input < -2)
224 return -EINVAL;
225 if (input > ATA_TMOUT_MAX_PARK) {
226 rc = -EOVERFLOW;
227 input = ATA_TMOUT_MAX_PARK;
228 }
229
230 ap = ata_shost_to_port(sdev->host);
231
232 spin_lock_irqsave(ap->lock, flags);
233 dev = ata_scsi_find_dev(ap, sdev);
234 if (unlikely(!dev)) {
235 rc = -ENODEV;
236 goto unlock;
237 }
238 if (dev->class != ATA_DEV_ATA) {
239 rc = -EOPNOTSUPP;
240 goto unlock;
241 }
242
243 if (input >= 0) {
244 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
245 rc = -EOPNOTSUPP;
246 goto unlock;
247 }
248
249 dev->unpark_deadline = ata_deadline(jiffies, input);
250 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
251 ata_port_schedule_eh(ap);
252 complete(&ap->park_req_pending);
253 } else {
254 switch (input) {
255 case -1:
256 dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
257 break;
258 case -2:
259 dev->flags |= ATA_DFLAG_NO_UNLOAD;
260 break;
261 }
262 }
263 unlock:
264 spin_unlock_irqrestore(ap->lock, flags);
265
266 return rc ? rc : len;
267 }
268 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
269 ata_scsi_park_show, ata_scsi_park_store);
270 EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
271
272 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
273 {
274 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
275
276 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
277 }
278
279 static ssize_t
280 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
281 const char *buf, size_t count)
282 {
283 struct Scsi_Host *shost = class_to_shost(dev);
284 struct ata_port *ap = ata_shost_to_port(shost);
285 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
286 return ap->ops->em_store(ap, buf, count);
287 return -EINVAL;
288 }
289
290 static ssize_t
291 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
292 char *buf)
293 {
294 struct Scsi_Host *shost = class_to_shost(dev);
295 struct ata_port *ap = ata_shost_to_port(shost);
296
297 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
298 return ap->ops->em_show(ap, buf);
299 return -EINVAL;
300 }
301 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
302 ata_scsi_em_message_show, ata_scsi_em_message_store);
303 EXPORT_SYMBOL_GPL(dev_attr_em_message);
304
305 static ssize_t
306 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
307 char *buf)
308 {
309 struct Scsi_Host *shost = class_to_shost(dev);
310 struct ata_port *ap = ata_shost_to_port(shost);
311
312 return snprintf(buf, 23, "%d\n", ap->em_message_type);
313 }
314 DEVICE_ATTR(em_message_type, S_IRUGO,
315 ata_scsi_em_message_type_show, NULL);
316 EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
317
318 static ssize_t
319 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
320 char *buf)
321 {
322 struct scsi_device *sdev = to_scsi_device(dev);
323 struct ata_port *ap = ata_shost_to_port(sdev->host);
324 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
325
326 if (atadev && ap->ops->sw_activity_show &&
327 (ap->flags & ATA_FLAG_SW_ACTIVITY))
328 return ap->ops->sw_activity_show(atadev, buf);
329 return -EINVAL;
330 }
331
332 static ssize_t
333 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
334 const char *buf, size_t count)
335 {
336 struct scsi_device *sdev = to_scsi_device(dev);
337 struct ata_port *ap = ata_shost_to_port(sdev->host);
338 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
339 enum sw_activity val;
340 int rc;
341
342 if (atadev && ap->ops->sw_activity_store &&
343 (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
344 val = simple_strtoul(buf, NULL, 0);
345 switch (val) {
346 case OFF: case BLINK_ON: case BLINK_OFF:
347 rc = ap->ops->sw_activity_store(atadev, val);
348 if (!rc)
349 return count;
350 else
351 return rc;
352 }
353 }
354 return -EINVAL;
355 }
356 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
357 ata_scsi_activity_store);
358 EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
359
360 struct device_attribute *ata_common_sdev_attrs[] = {
361 &dev_attr_unload_heads,
362 NULL
363 };
364 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
365
366 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd)
367 {
368 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
369 /* "Invalid field in cbd" */
370 cmd->scsi_done(cmd);
371 }
372
373 /**
374 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
375 * @sdev: SCSI device for which BIOS geometry is to be determined
376 * @bdev: block device associated with @sdev
377 * @capacity: capacity of SCSI device
378 * @geom: location to which geometry will be output
379 *
380 * Generic bios head/sector/cylinder calculator
381 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
382 * mapping. Some situations may arise where the disk is not
383 * bootable if this is not used.
384 *
385 * LOCKING:
386 * Defined by the SCSI layer. We don't really care.
387 *
388 * RETURNS:
389 * Zero.
390 */
391 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
392 sector_t capacity, int geom[])
393 {
394 geom[0] = 255;
395 geom[1] = 63;
396 sector_div(capacity, 255*63);
397 geom[2] = capacity;
398
399 return 0;
400 }
401
402 /**
403 * ata_scsi_unlock_native_capacity - unlock native capacity
404 * @sdev: SCSI device to adjust device capacity for
405 *
406 * This function is called if a partition on @sdev extends beyond
407 * the end of the device. It requests EH to unlock HPA.
408 *
409 * LOCKING:
410 * Defined by the SCSI layer. Might sleep.
411 */
412 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
413 {
414 struct ata_port *ap = ata_shost_to_port(sdev->host);
415 struct ata_device *dev;
416 unsigned long flags;
417
418 spin_lock_irqsave(ap->lock, flags);
419
420 dev = ata_scsi_find_dev(ap, sdev);
421 if (dev && dev->n_sectors < dev->n_native_sectors) {
422 dev->flags |= ATA_DFLAG_UNLOCK_HPA;
423 dev->link->eh_info.action |= ATA_EH_RESET;
424 ata_port_schedule_eh(ap);
425 }
426
427 spin_unlock_irqrestore(ap->lock, flags);
428 ata_port_wait_eh(ap);
429 }
430
431 /**
432 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
433 * @ap: target port
434 * @sdev: SCSI device to get identify data for
435 * @arg: User buffer area for identify data
436 *
437 * LOCKING:
438 * Defined by the SCSI layer. We don't really care.
439 *
440 * RETURNS:
441 * Zero on success, negative errno on error.
442 */
443 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
444 void __user *arg)
445 {
446 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
447 u16 __user *dst = arg;
448 char buf[40];
449
450 if (!dev)
451 return -ENOMSG;
452
453 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
454 return -EFAULT;
455
456 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
457 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
458 return -EFAULT;
459
460 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
461 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
462 return -EFAULT;
463
464 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
465 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
466 return -EFAULT;
467
468 return 0;
469 }
470
471 /**
472 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
473 * @scsidev: Device to which we are issuing command
474 * @arg: User provided data for issuing command
475 *
476 * LOCKING:
477 * Defined by the SCSI layer. We don't really care.
478 *
479 * RETURNS:
480 * Zero on success, negative errno on error.
481 */
482 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
483 {
484 int rc = 0;
485 u8 scsi_cmd[MAX_COMMAND_SIZE];
486 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
487 int argsize = 0;
488 enum dma_data_direction data_dir;
489 int cmd_result;
490
491 if (arg == NULL)
492 return -EINVAL;
493
494 if (copy_from_user(args, arg, sizeof(args)))
495 return -EFAULT;
496
497 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
498 if (!sensebuf)
499 return -ENOMEM;
500
501 memset(scsi_cmd, 0, sizeof(scsi_cmd));
502
503 if (args[3]) {
504 argsize = ATA_SECT_SIZE * args[3];
505 argbuf = kmalloc(argsize, GFP_KERNEL);
506 if (argbuf == NULL) {
507 rc = -ENOMEM;
508 goto error;
509 }
510
511 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
512 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
513 block count in sector count field */
514 data_dir = DMA_FROM_DEVICE;
515 } else {
516 scsi_cmd[1] = (3 << 1); /* Non-data */
517 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
518 data_dir = DMA_NONE;
519 }
520
521 scsi_cmd[0] = ATA_16;
522
523 scsi_cmd[4] = args[2];
524 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
525 scsi_cmd[6] = args[3];
526 scsi_cmd[8] = args[1];
527 scsi_cmd[10] = 0x4f;
528 scsi_cmd[12] = 0xc2;
529 } else {
530 scsi_cmd[6] = args[1];
531 }
532 scsi_cmd[14] = args[0];
533
534 /* Good values for timeout and retries? Values below
535 from scsi_ioctl_send_command() for default case... */
536 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
537 sensebuf, (10*HZ), 5, 0, NULL);
538
539 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
540 u8 *desc = sensebuf + 8;
541 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
542
543 /* If we set cc then ATA pass-through will cause a
544 * check condition even if no error. Filter that. */
545 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
546 struct scsi_sense_hdr sshdr;
547 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
548 &sshdr);
549 if (sshdr.sense_key == RECOVERED_ERROR &&
550 sshdr.asc == 0 && sshdr.ascq == 0x1d)
551 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
552 }
553
554 /* Send userspace a few ATA registers (same as drivers/ide) */
555 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
556 desc[0] == 0x09) { /* code is "ATA Descriptor" */
557 args[0] = desc[13]; /* status */
558 args[1] = desc[3]; /* error */
559 args[2] = desc[5]; /* sector count (0:7) */
560 if (copy_to_user(arg, args, sizeof(args)))
561 rc = -EFAULT;
562 }
563 }
564
565
566 if (cmd_result) {
567 rc = -EIO;
568 goto error;
569 }
570
571 if ((argbuf)
572 && copy_to_user(arg + sizeof(args), argbuf, argsize))
573 rc = -EFAULT;
574 error:
575 kfree(sensebuf);
576 kfree(argbuf);
577 return rc;
578 }
579
580 /**
581 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
582 * @scsidev: Device to which we are issuing command
583 * @arg: User provided data for issuing command
584 *
585 * LOCKING:
586 * Defined by the SCSI layer. We don't really care.
587 *
588 * RETURNS:
589 * Zero on success, negative errno on error.
590 */
591 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
592 {
593 int rc = 0;
594 u8 scsi_cmd[MAX_COMMAND_SIZE];
595 u8 args[7], *sensebuf = NULL;
596 int cmd_result;
597
598 if (arg == NULL)
599 return -EINVAL;
600
601 if (copy_from_user(args, arg, sizeof(args)))
602 return -EFAULT;
603
604 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
605 if (!sensebuf)
606 return -ENOMEM;
607
608 memset(scsi_cmd, 0, sizeof(scsi_cmd));
609 scsi_cmd[0] = ATA_16;
610 scsi_cmd[1] = (3 << 1); /* Non-data */
611 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
612 scsi_cmd[4] = args[1];
613 scsi_cmd[6] = args[2];
614 scsi_cmd[8] = args[3];
615 scsi_cmd[10] = args[4];
616 scsi_cmd[12] = args[5];
617 scsi_cmd[13] = args[6] & 0x4f;
618 scsi_cmd[14] = args[0];
619
620 /* Good values for timeout and retries? Values below
621 from scsi_ioctl_send_command() for default case... */
622 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
623 sensebuf, (10*HZ), 5, 0, NULL);
624
625 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
626 u8 *desc = sensebuf + 8;
627 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
628
629 /* If we set cc then ATA pass-through will cause a
630 * check condition even if no error. Filter that. */
631 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
632 struct scsi_sense_hdr sshdr;
633 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
634 &sshdr);
635 if (sshdr.sense_key == RECOVERED_ERROR &&
636 sshdr.asc == 0 && sshdr.ascq == 0x1d)
637 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
638 }
639
640 /* Send userspace ATA registers */
641 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
642 desc[0] == 0x09) {/* code is "ATA Descriptor" */
643 args[0] = desc[13]; /* status */
644 args[1] = desc[3]; /* error */
645 args[2] = desc[5]; /* sector count (0:7) */
646 args[3] = desc[7]; /* lbal */
647 args[4] = desc[9]; /* lbam */
648 args[5] = desc[11]; /* lbah */
649 args[6] = desc[12]; /* select */
650 if (copy_to_user(arg, args, sizeof(args)))
651 rc = -EFAULT;
652 }
653 }
654
655 if (cmd_result) {
656 rc = -EIO;
657 goto error;
658 }
659
660 error:
661 kfree(sensebuf);
662 return rc;
663 }
664
665 static int ata_ioc32(struct ata_port *ap)
666 {
667 if (ap->flags & ATA_FLAG_PIO_DMA)
668 return 1;
669 if (ap->pflags & ATA_PFLAG_PIO32)
670 return 1;
671 return 0;
672 }
673
674 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
675 int cmd, void __user *arg)
676 {
677 int val = -EINVAL, rc = -EINVAL;
678 unsigned long flags;
679
680 switch (cmd) {
681 case ATA_IOC_GET_IO32:
682 spin_lock_irqsave(ap->lock, flags);
683 val = ata_ioc32(ap);
684 spin_unlock_irqrestore(ap->lock, flags);
685 if (copy_to_user(arg, &val, 1))
686 return -EFAULT;
687 return 0;
688
689 case ATA_IOC_SET_IO32:
690 val = (unsigned long) arg;
691 rc = 0;
692 spin_lock_irqsave(ap->lock, flags);
693 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
694 if (val)
695 ap->pflags |= ATA_PFLAG_PIO32;
696 else
697 ap->pflags &= ~ATA_PFLAG_PIO32;
698 } else {
699 if (val != ata_ioc32(ap))
700 rc = -EINVAL;
701 }
702 spin_unlock_irqrestore(ap->lock, flags);
703 return rc;
704
705 case HDIO_GET_IDENTITY:
706 return ata_get_identity(ap, scsidev, arg);
707
708 case HDIO_DRIVE_CMD:
709 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
710 return -EACCES;
711 return ata_cmd_ioctl(scsidev, arg);
712
713 case HDIO_DRIVE_TASK:
714 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
715 return -EACCES;
716 return ata_task_ioctl(scsidev, arg);
717
718 default:
719 rc = -ENOTTY;
720 break;
721 }
722
723 return rc;
724 }
725 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
726
727 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
728 {
729 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
730 scsidev, cmd, arg);
731 }
732 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
733
734 /**
735 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
736 * @dev: ATA device to which the new command is attached
737 * @cmd: SCSI command that originated this ATA command
738 *
739 * Obtain a reference to an unused ata_queued_cmd structure,
740 * which is the basic libata structure representing a single
741 * ATA command sent to the hardware.
742 *
743 * If a command was available, fill in the SCSI-specific
744 * portions of the structure with information on the
745 * current command.
746 *
747 * LOCKING:
748 * spin_lock_irqsave(host lock)
749 *
750 * RETURNS:
751 * Command allocated, or %NULL if none available.
752 */
753 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
754 struct scsi_cmnd *cmd)
755 {
756 struct ata_queued_cmd *qc;
757
758 qc = ata_qc_new_init(dev);
759 if (qc) {
760 qc->scsicmd = cmd;
761 qc->scsidone = cmd->scsi_done;
762
763 qc->sg = scsi_sglist(cmd);
764 qc->n_elem = scsi_sg_count(cmd);
765 } else {
766 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
767 cmd->scsi_done(cmd);
768 }
769
770 return qc;
771 }
772
773 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
774 {
775 struct scsi_cmnd *scmd = qc->scsicmd;
776
777 qc->extrabytes = scmd->request->extra_len;
778 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
779 }
780
781 /**
782 * ata_dump_status - user friendly display of error info
783 * @id: id of the port in question
784 * @tf: ptr to filled out taskfile
785 *
786 * Decode and dump the ATA error/status registers for the user so
787 * that they have some idea what really happened at the non
788 * make-believe layer.
789 *
790 * LOCKING:
791 * inherited from caller
792 */
793 static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
794 {
795 u8 stat = tf->command, err = tf->feature;
796
797 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
798 if (stat & ATA_BUSY) {
799 printk("Busy }\n"); /* Data is not valid in this case */
800 } else {
801 if (stat & 0x40) printk("DriveReady ");
802 if (stat & 0x20) printk("DeviceFault ");
803 if (stat & 0x10) printk("SeekComplete ");
804 if (stat & 0x08) printk("DataRequest ");
805 if (stat & 0x04) printk("CorrectedError ");
806 if (stat & 0x02) printk("Index ");
807 if (stat & 0x01) printk("Error ");
808 printk("}\n");
809
810 if (err) {
811 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
812 if (err & 0x04) printk("DriveStatusError ");
813 if (err & 0x80) {
814 if (err & 0x04) printk("BadCRC ");
815 else printk("Sector ");
816 }
817 if (err & 0x40) printk("UncorrectableError ");
818 if (err & 0x10) printk("SectorIdNotFound ");
819 if (err & 0x02) printk("TrackZeroNotFound ");
820 if (err & 0x01) printk("AddrMarkNotFound ");
821 printk("}\n");
822 }
823 }
824 }
825
826 /**
827 * ata_to_sense_error - convert ATA error to SCSI error
828 * @id: ATA device number
829 * @drv_stat: value contained in ATA status register
830 * @drv_err: value contained in ATA error register
831 * @sk: the sense key we'll fill out
832 * @asc: the additional sense code we'll fill out
833 * @ascq: the additional sense code qualifier we'll fill out
834 * @verbose: be verbose
835 *
836 * Converts an ATA error into a SCSI error. Fill out pointers to
837 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
838 * format sense blocks.
839 *
840 * LOCKING:
841 * spin_lock_irqsave(host lock)
842 */
843 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
844 u8 *asc, u8 *ascq, int verbose)
845 {
846 int i;
847
848 /* Based on the 3ware driver translation table */
849 static const unsigned char sense_table[][4] = {
850 /* BBD|ECC|ID|MAR */
851 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
852 /* BBD|ECC|ID */
853 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
854 /* ECC|MC|MARK */
855 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
856 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
857 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
858 /* MC|ID|ABRT|TRK0|MARK */
859 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
860 /* MCR|MARK */
861 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
862 /* Bad address mark */
863 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
864 /* TRK0 */
865 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
866 /* Abort: 0x04 is not translated here, see below */
867 /* Media change request */
868 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
869 /* SRV/IDNF */
870 {0x10, ILLEGAL_REQUEST, 0x21, 0x00}, // ID not found Logical address out of range
871 /* MC */
872 {0x20, UNIT_ATTENTION, 0x28, 0x00}, // Media Changed Not ready to ready change, medium may have changed
873 /* ECC */
874 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
875 /* BBD - block marked bad */
876 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
877 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
878 };
879 static const unsigned char stat_table[][4] = {
880 /* Must be first because BUSY means no other bits valid */
881 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
882 {0x20, HARDWARE_ERROR, 0x44, 0x00}, // Device fault, internal target failure
883 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
884 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
885 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
886 };
887
888 /*
889 * Is this an error we can process/parse
890 */
891 if (drv_stat & ATA_BUSY) {
892 drv_err = 0; /* Ignore the err bits, they're invalid */
893 }
894
895 if (drv_err) {
896 /* Look for drv_err */
897 for (i = 0; sense_table[i][0] != 0xFF; i++) {
898 /* Look for best matches first */
899 if ((sense_table[i][0] & drv_err) ==
900 sense_table[i][0]) {
901 *sk = sense_table[i][1];
902 *asc = sense_table[i][2];
903 *ascq = sense_table[i][3];
904 goto translate_done;
905 }
906 }
907 }
908
909 /*
910 * Fall back to interpreting status bits. Note that if the drv_err
911 * has only the ABRT bit set, we decode drv_stat. ABRT by itself
912 * is not descriptive enough.
913 */
914 for (i = 0; stat_table[i][0] != 0xFF; i++) {
915 if (stat_table[i][0] & drv_stat) {
916 *sk = stat_table[i][1];
917 *asc = stat_table[i][2];
918 *ascq = stat_table[i][3];
919 goto translate_done;
920 }
921 }
922
923 /*
924 * We need a sensible error return here, which is tricky, and one
925 * that won't cause people to do things like return a disk wrongly.
926 */
927 *sk = ABORTED_COMMAND;
928 *asc = 0x00;
929 *ascq = 0x00;
930
931 translate_done:
932 if (verbose)
933 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
934 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
935 id, drv_stat, drv_err, *sk, *asc, *ascq);
936 return;
937 }
938
939 /*
940 * ata_gen_passthru_sense - Generate check condition sense block.
941 * @qc: Command that completed.
942 *
943 * This function is specific to the ATA descriptor format sense
944 * block specified for the ATA pass through commands. Regardless
945 * of whether the command errored or not, return a sense
946 * block. Copy all controller registers into the sense
947 * block. If there was no error, we get the request from an ATA
948 * passthrough command, so we use the following sense data:
949 * sk = RECOVERED ERROR
950 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
951 *
952 *
953 * LOCKING:
954 * None.
955 */
956 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
957 {
958 struct scsi_cmnd *cmd = qc->scsicmd;
959 struct ata_taskfile *tf = &qc->result_tf;
960 unsigned char *sb = cmd->sense_buffer;
961 unsigned char *desc = sb + 8;
962 int verbose = qc->ap->ops->error_handler == NULL;
963
964 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
965
966 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
967
968 /*
969 * Use ata_to_sense_error() to map status register bits
970 * onto sense key, asc & ascq.
971 */
972 if (qc->err_mask ||
973 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
974 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
975 &sb[1], &sb[2], &sb[3], verbose);
976 sb[1] &= 0x0f;
977 } else {
978 sb[1] = RECOVERED_ERROR;
979 sb[2] = 0;
980 sb[3] = 0x1D;
981 }
982
983 /*
984 * Sense data is current and format is descriptor.
985 */
986 sb[0] = 0x72;
987
988 desc[0] = 0x09;
989
990 /* set length of additional sense data */
991 sb[7] = 14;
992 desc[1] = 12;
993
994 /*
995 * Copy registers into sense buffer.
996 */
997 desc[2] = 0x00;
998 desc[3] = tf->feature; /* == error reg */
999 desc[5] = tf->nsect;
1000 desc[7] = tf->lbal;
1001 desc[9] = tf->lbam;
1002 desc[11] = tf->lbah;
1003 desc[12] = tf->device;
1004 desc[13] = tf->command; /* == status reg */
1005
1006 /*
1007 * Fill in Extend bit, and the high order bytes
1008 * if applicable.
1009 */
1010 if (tf->flags & ATA_TFLAG_LBA48) {
1011 desc[2] |= 0x01;
1012 desc[4] = tf->hob_nsect;
1013 desc[6] = tf->hob_lbal;
1014 desc[8] = tf->hob_lbam;
1015 desc[10] = tf->hob_lbah;
1016 }
1017 }
1018
1019 /**
1020 * ata_gen_ata_sense - generate a SCSI fixed sense block
1021 * @qc: Command that we are erroring out
1022 *
1023 * Generate sense block for a failed ATA command @qc. Descriptor
1024 * format is used to accommodate LBA48 block address.
1025 *
1026 * LOCKING:
1027 * None.
1028 */
1029 static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
1030 {
1031 struct ata_device *dev = qc->dev;
1032 struct scsi_cmnd *cmd = qc->scsicmd;
1033 struct ata_taskfile *tf = &qc->result_tf;
1034 unsigned char *sb = cmd->sense_buffer;
1035 unsigned char *desc = sb + 8;
1036 int verbose = qc->ap->ops->error_handler == NULL;
1037 u64 block;
1038
1039 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1040
1041 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
1042
1043 /* sense data is current and format is descriptor */
1044 sb[0] = 0x72;
1045
1046 /* Use ata_to_sense_error() to map status register bits
1047 * onto sense key, asc & ascq.
1048 */
1049 if (qc->err_mask ||
1050 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
1051 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
1052 &sb[1], &sb[2], &sb[3], verbose);
1053 sb[1] &= 0x0f;
1054 }
1055
1056 block = ata_tf_read_block(&qc->result_tf, dev);
1057
1058 /* information sense data descriptor */
1059 sb[7] = 12;
1060 desc[0] = 0x00;
1061 desc[1] = 10;
1062
1063 desc[2] |= 0x80; /* valid */
1064 desc[6] = block >> 40;
1065 desc[7] = block >> 32;
1066 desc[8] = block >> 24;
1067 desc[9] = block >> 16;
1068 desc[10] = block >> 8;
1069 desc[11] = block;
1070 }
1071
1072 static void ata_scsi_sdev_config(struct scsi_device *sdev)
1073 {
1074 sdev->use_10_for_rw = 1;
1075 sdev->use_10_for_ms = 1;
1076 sdev->no_report_opcodes = 1;
1077 sdev->no_write_same = 1;
1078
1079 /* Schedule policy is determined by ->qc_defer() callback and
1080 * it needs to see every deferred qc. Set dev_blocked to 1 to
1081 * prevent SCSI midlayer from automatically deferring
1082 * requests.
1083 */
1084 sdev->max_device_blocked = 1;
1085 }
1086
1087 /**
1088 * atapi_drain_needed - Check whether data transfer may overflow
1089 * @rq: request to be checked
1090 *
1091 * ATAPI commands which transfer variable length data to host
1092 * might overflow due to application error or hardare bug. This
1093 * function checks whether overflow should be drained and ignored
1094 * for @request.
1095 *
1096 * LOCKING:
1097 * None.
1098 *
1099 * RETURNS:
1100 * 1 if ; otherwise, 0.
1101 */
1102 static int atapi_drain_needed(struct request *rq)
1103 {
1104 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
1105 return 0;
1106
1107 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
1108 return 0;
1109
1110 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1111 }
1112
1113 static int ata_scsi_dev_config(struct scsi_device *sdev,
1114 struct ata_device *dev)
1115 {
1116 struct request_queue *q = sdev->request_queue;
1117
1118 if (!ata_id_has_unload(dev->id))
1119 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1120
1121 /* configure max sectors */
1122 blk_queue_max_hw_sectors(q, dev->max_sectors);
1123
1124 if (dev->class == ATA_DEV_ATAPI) {
1125 void *buf;
1126
1127 sdev->sector_size = ATA_SECT_SIZE;
1128
1129 /* set DMA padding */
1130 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
1131
1132 /* configure draining */
1133 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1134 if (!buf) {
1135 ata_dev_err(dev, "drain buffer allocation failed\n");
1136 return -ENOMEM;
1137 }
1138
1139 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1140 } else {
1141 sdev->sector_size = ata_id_logical_sector_size(dev->id);
1142 sdev->manage_start_stop = 1;
1143 }
1144
1145 /*
1146 * ata_pio_sectors() expects buffer for each sector to not cross
1147 * page boundary. Enforce it by requiring buffers to be sector
1148 * aligned, which works iff sector_size is not larger than
1149 * PAGE_SIZE. ATAPI devices also need the alignment as
1150 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1151 */
1152 if (sdev->sector_size > PAGE_SIZE)
1153 ata_dev_warn(dev,
1154 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1155 sdev->sector_size);
1156
1157 blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
1158
1159 if (dev->flags & ATA_DFLAG_AN)
1160 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1161
1162 if (dev->flags & ATA_DFLAG_NCQ) {
1163 int depth;
1164
1165 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1166 depth = min(ATA_MAX_QUEUE - 1, depth);
1167 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
1168 }
1169
1170 blk_queue_flush_queueable(q, false);
1171
1172 dev->sdev = sdev;
1173 return 0;
1174 }
1175
1176 /**
1177 * ata_scsi_slave_config - Set SCSI device attributes
1178 * @sdev: SCSI device to examine
1179 *
1180 * This is called before we actually start reading
1181 * and writing to the device, to configure certain
1182 * SCSI mid-layer behaviors.
1183 *
1184 * LOCKING:
1185 * Defined by SCSI layer. We don't really care.
1186 */
1187
1188 int ata_scsi_slave_config(struct scsi_device *sdev)
1189 {
1190 struct ata_port *ap = ata_shost_to_port(sdev->host);
1191 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1192 int rc = 0;
1193
1194 ata_scsi_sdev_config(sdev);
1195
1196 if (dev)
1197 rc = ata_scsi_dev_config(sdev, dev);
1198
1199 return rc;
1200 }
1201
1202 /**
1203 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1204 * @sdev: SCSI device to be destroyed
1205 *
1206 * @sdev is about to be destroyed for hot/warm unplugging. If
1207 * this unplugging was initiated by libata as indicated by NULL
1208 * dev->sdev, this function doesn't have to do anything.
1209 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1210 * Clear dev->sdev, schedule the device for ATA detach and invoke
1211 * EH.
1212 *
1213 * LOCKING:
1214 * Defined by SCSI layer. We don't really care.
1215 */
1216 void ata_scsi_slave_destroy(struct scsi_device *sdev)
1217 {
1218 struct ata_port *ap = ata_shost_to_port(sdev->host);
1219 struct request_queue *q = sdev->request_queue;
1220 unsigned long flags;
1221 struct ata_device *dev;
1222
1223 if (!ap->ops->error_handler)
1224 return;
1225
1226 spin_lock_irqsave(ap->lock, flags);
1227 dev = __ata_scsi_find_dev(ap, sdev);
1228 if (dev && dev->sdev) {
1229 /* SCSI device already in CANCEL state, no need to offline it */
1230 dev->sdev = NULL;
1231 dev->flags |= ATA_DFLAG_DETACH;
1232 ata_port_schedule_eh(ap);
1233 }
1234 spin_unlock_irqrestore(ap->lock, flags);
1235
1236 kfree(q->dma_drain_buffer);
1237 q->dma_drain_buffer = NULL;
1238 q->dma_drain_size = 0;
1239 }
1240
1241 /**
1242 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
1243 * @ap: ATA port to which the device change the queue depth
1244 * @sdev: SCSI device to configure queue depth for
1245 * @queue_depth: new queue depth
1246 * @reason: calling context
1247 *
1248 * libsas and libata have different approaches for associating a sdev to
1249 * its ata_port.
1250 *
1251 */
1252 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
1253 int queue_depth, int reason)
1254 {
1255 struct ata_device *dev;
1256 unsigned long flags;
1257
1258 if (reason != SCSI_QDEPTH_DEFAULT)
1259 return -EOPNOTSUPP;
1260
1261 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1262 return sdev->queue_depth;
1263
1264 dev = ata_scsi_find_dev(ap, sdev);
1265 if (!dev || !ata_dev_enabled(dev))
1266 return sdev->queue_depth;
1267
1268 /* NCQ enabled? */
1269 spin_lock_irqsave(ap->lock, flags);
1270 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1271 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1272 dev->flags |= ATA_DFLAG_NCQ_OFF;
1273 queue_depth = 1;
1274 }
1275 spin_unlock_irqrestore(ap->lock, flags);
1276
1277 /* limit and apply queue depth */
1278 queue_depth = min(queue_depth, sdev->host->can_queue);
1279 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1280 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1281
1282 if (sdev->queue_depth == queue_depth)
1283 return -EINVAL;
1284
1285 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
1286 return queue_depth;
1287 }
1288
1289 /**
1290 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1291 * @sdev: SCSI device to configure queue depth for
1292 * @queue_depth: new queue depth
1293 * @reason: calling context
1294 *
1295 * This is libata standard hostt->change_queue_depth callback.
1296 * SCSI will call into this callback when user tries to set queue
1297 * depth via sysfs.
1298 *
1299 * LOCKING:
1300 * SCSI layer (we don't care)
1301 *
1302 * RETURNS:
1303 * Newly configured queue depth.
1304 */
1305 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth,
1306 int reason)
1307 {
1308 struct ata_port *ap = ata_shost_to_port(sdev->host);
1309
1310 return __ata_change_queue_depth(ap, sdev, queue_depth, reason);
1311 }
1312
1313 /**
1314 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1315 * @qc: Storage for translated ATA taskfile
1316 *
1317 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1318 * (to start). Perhaps these commands should be preceded by
1319 * CHECK POWER MODE to see what power mode the device is already in.
1320 * [See SAT revision 5 at www.t10.org]
1321 *
1322 * LOCKING:
1323 * spin_lock_irqsave(host lock)
1324 *
1325 * RETURNS:
1326 * Zero on success, non-zero on error.
1327 */
1328 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1329 {
1330 struct scsi_cmnd *scmd = qc->scsicmd;
1331 struct ata_taskfile *tf = &qc->tf;
1332 const u8 *cdb = scmd->cmnd;
1333
1334 if (scmd->cmd_len < 5)
1335 goto invalid_fld;
1336
1337 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1338 tf->protocol = ATA_PROT_NODATA;
1339 if (cdb[1] & 0x1) {
1340 ; /* ignore IMMED bit, violates sat-r05 */
1341 }
1342 if (cdb[4] & 0x2)
1343 goto invalid_fld; /* LOEJ bit set not supported */
1344 if (((cdb[4] >> 4) & 0xf) != 0)
1345 goto invalid_fld; /* power conditions not supported */
1346
1347 if (cdb[4] & 0x1) {
1348 tf->nsect = 1; /* 1 sector, lba=0 */
1349
1350 if (qc->dev->flags & ATA_DFLAG_LBA) {
1351 tf->flags |= ATA_TFLAG_LBA;
1352
1353 tf->lbah = 0x0;
1354 tf->lbam = 0x0;
1355 tf->lbal = 0x0;
1356 tf->device |= ATA_LBA;
1357 } else {
1358 /* CHS */
1359 tf->lbal = 0x1; /* sect */
1360 tf->lbam = 0x0; /* cyl low */
1361 tf->lbah = 0x0; /* cyl high */
1362 }
1363
1364 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
1365 } else {
1366 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1367 * or S5) causing some drives to spin up and down again.
1368 */
1369 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1370 system_state == SYSTEM_POWER_OFF)
1371 goto skip;
1372
1373 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1374 system_entering_hibernation())
1375 goto skip;
1376
1377 /* Issue ATA STANDBY IMMEDIATE command */
1378 tf->command = ATA_CMD_STANDBYNOW1;
1379 }
1380
1381 /*
1382 * Standby and Idle condition timers could be implemented but that
1383 * would require libata to implement the Power condition mode page
1384 * and allow the user to change it. Changing mode pages requires
1385 * MODE SELECT to be implemented.
1386 */
1387
1388 return 0;
1389
1390 invalid_fld:
1391 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1392 /* "Invalid field in cbd" */
1393 return 1;
1394 skip:
1395 scmd->result = SAM_STAT_GOOD;
1396 return 1;
1397 }
1398
1399
1400 /**
1401 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1402 * @qc: Storage for translated ATA taskfile
1403 *
1404 * Sets up an ATA taskfile to issue FLUSH CACHE or
1405 * FLUSH CACHE EXT.
1406 *
1407 * LOCKING:
1408 * spin_lock_irqsave(host lock)
1409 *
1410 * RETURNS:
1411 * Zero on success, non-zero on error.
1412 */
1413 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1414 {
1415 struct ata_taskfile *tf = &qc->tf;
1416
1417 tf->flags |= ATA_TFLAG_DEVICE;
1418 tf->protocol = ATA_PROT_NODATA;
1419
1420 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1421 tf->command = ATA_CMD_FLUSH_EXT;
1422 else
1423 tf->command = ATA_CMD_FLUSH;
1424
1425 /* flush is critical for IO integrity, consider it an IO command */
1426 qc->flags |= ATA_QCFLAG_IO;
1427
1428 return 0;
1429 }
1430
1431 /**
1432 * scsi_6_lba_len - Get LBA and transfer length
1433 * @cdb: SCSI command to translate
1434 *
1435 * Calculate LBA and transfer length for 6-byte commands.
1436 *
1437 * RETURNS:
1438 * @plba: the LBA
1439 * @plen: the transfer length
1440 */
1441 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1442 {
1443 u64 lba = 0;
1444 u32 len;
1445
1446 VPRINTK("six-byte command\n");
1447
1448 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1449 lba |= ((u64)cdb[2]) << 8;
1450 lba |= ((u64)cdb[3]);
1451
1452 len = cdb[4];
1453
1454 *plba = lba;
1455 *plen = len;
1456 }
1457
1458 /**
1459 * scsi_10_lba_len - Get LBA and transfer length
1460 * @cdb: SCSI command to translate
1461 *
1462 * Calculate LBA and transfer length for 10-byte commands.
1463 *
1464 * RETURNS:
1465 * @plba: the LBA
1466 * @plen: the transfer length
1467 */
1468 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1469 {
1470 u64 lba = 0;
1471 u32 len = 0;
1472
1473 VPRINTK("ten-byte command\n");
1474
1475 lba |= ((u64)cdb[2]) << 24;
1476 lba |= ((u64)cdb[3]) << 16;
1477 lba |= ((u64)cdb[4]) << 8;
1478 lba |= ((u64)cdb[5]);
1479
1480 len |= ((u32)cdb[7]) << 8;
1481 len |= ((u32)cdb[8]);
1482
1483 *plba = lba;
1484 *plen = len;
1485 }
1486
1487 /**
1488 * scsi_16_lba_len - Get LBA and transfer length
1489 * @cdb: SCSI command to translate
1490 *
1491 * Calculate LBA and transfer length for 16-byte commands.
1492 *
1493 * RETURNS:
1494 * @plba: the LBA
1495 * @plen: the transfer length
1496 */
1497 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1498 {
1499 u64 lba = 0;
1500 u32 len = 0;
1501
1502 VPRINTK("sixteen-byte command\n");
1503
1504 lba |= ((u64)cdb[2]) << 56;
1505 lba |= ((u64)cdb[3]) << 48;
1506 lba |= ((u64)cdb[4]) << 40;
1507 lba |= ((u64)cdb[5]) << 32;
1508 lba |= ((u64)cdb[6]) << 24;
1509 lba |= ((u64)cdb[7]) << 16;
1510 lba |= ((u64)cdb[8]) << 8;
1511 lba |= ((u64)cdb[9]);
1512
1513 len |= ((u32)cdb[10]) << 24;
1514 len |= ((u32)cdb[11]) << 16;
1515 len |= ((u32)cdb[12]) << 8;
1516 len |= ((u32)cdb[13]);
1517
1518 *plba = lba;
1519 *plen = len;
1520 }
1521
1522 /**
1523 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1524 * @qc: Storage for translated ATA taskfile
1525 *
1526 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1527 *
1528 * LOCKING:
1529 * spin_lock_irqsave(host lock)
1530 *
1531 * RETURNS:
1532 * Zero on success, non-zero on error.
1533 */
1534 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1535 {
1536 struct scsi_cmnd *scmd = qc->scsicmd;
1537 struct ata_taskfile *tf = &qc->tf;
1538 struct ata_device *dev = qc->dev;
1539 u64 dev_sectors = qc->dev->n_sectors;
1540 const u8 *cdb = scmd->cmnd;
1541 u64 block;
1542 u32 n_block;
1543
1544 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1545 tf->protocol = ATA_PROT_NODATA;
1546
1547 if (cdb[0] == VERIFY) {
1548 if (scmd->cmd_len < 10)
1549 goto invalid_fld;
1550 scsi_10_lba_len(cdb, &block, &n_block);
1551 } else if (cdb[0] == VERIFY_16) {
1552 if (scmd->cmd_len < 16)
1553 goto invalid_fld;
1554 scsi_16_lba_len(cdb, &block, &n_block);
1555 } else
1556 goto invalid_fld;
1557
1558 if (!n_block)
1559 goto nothing_to_do;
1560 if (block >= dev_sectors)
1561 goto out_of_range;
1562 if ((block + n_block) > dev_sectors)
1563 goto out_of_range;
1564
1565 if (dev->flags & ATA_DFLAG_LBA) {
1566 tf->flags |= ATA_TFLAG_LBA;
1567
1568 if (lba_28_ok(block, n_block)) {
1569 /* use LBA28 */
1570 tf->command = ATA_CMD_VERIFY;
1571 tf->device |= (block >> 24) & 0xf;
1572 } else if (lba_48_ok(block, n_block)) {
1573 if (!(dev->flags & ATA_DFLAG_LBA48))
1574 goto out_of_range;
1575
1576 /* use LBA48 */
1577 tf->flags |= ATA_TFLAG_LBA48;
1578 tf->command = ATA_CMD_VERIFY_EXT;
1579
1580 tf->hob_nsect = (n_block >> 8) & 0xff;
1581
1582 tf->hob_lbah = (block >> 40) & 0xff;
1583 tf->hob_lbam = (block >> 32) & 0xff;
1584 tf->hob_lbal = (block >> 24) & 0xff;
1585 } else
1586 /* request too large even for LBA48 */
1587 goto out_of_range;
1588
1589 tf->nsect = n_block & 0xff;
1590
1591 tf->lbah = (block >> 16) & 0xff;
1592 tf->lbam = (block >> 8) & 0xff;
1593 tf->lbal = block & 0xff;
1594
1595 tf->device |= ATA_LBA;
1596 } else {
1597 /* CHS */
1598 u32 sect, head, cyl, track;
1599
1600 if (!lba_28_ok(block, n_block))
1601 goto out_of_range;
1602
1603 /* Convert LBA to CHS */
1604 track = (u32)block / dev->sectors;
1605 cyl = track / dev->heads;
1606 head = track % dev->heads;
1607 sect = (u32)block % dev->sectors + 1;
1608
1609 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1610 (u32)block, track, cyl, head, sect);
1611
1612 /* Check whether the converted CHS can fit.
1613 Cylinder: 0-65535
1614 Head: 0-15
1615 Sector: 1-255*/
1616 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1617 goto out_of_range;
1618
1619 tf->command = ATA_CMD_VERIFY;
1620 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1621 tf->lbal = sect;
1622 tf->lbam = cyl;
1623 tf->lbah = cyl >> 8;
1624 tf->device |= head;
1625 }
1626
1627 return 0;
1628
1629 invalid_fld:
1630 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1631 /* "Invalid field in cbd" */
1632 return 1;
1633
1634 out_of_range:
1635 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1636 /* "Logical Block Address out of range" */
1637 return 1;
1638
1639 nothing_to_do:
1640 scmd->result = SAM_STAT_GOOD;
1641 return 1;
1642 }
1643
1644 /**
1645 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1646 * @qc: Storage for translated ATA taskfile
1647 *
1648 * Converts any of six SCSI read/write commands into the
1649 * ATA counterpart, including starting sector (LBA),
1650 * sector count, and taking into account the device's LBA48
1651 * support.
1652 *
1653 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1654 * %WRITE_16 are currently supported.
1655 *
1656 * LOCKING:
1657 * spin_lock_irqsave(host lock)
1658 *
1659 * RETURNS:
1660 * Zero on success, non-zero on error.
1661 */
1662 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1663 {
1664 struct scsi_cmnd *scmd = qc->scsicmd;
1665 const u8 *cdb = scmd->cmnd;
1666 unsigned int tf_flags = 0;
1667 u64 block;
1668 u32 n_block;
1669 int rc;
1670
1671 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1672 tf_flags |= ATA_TFLAG_WRITE;
1673
1674 /* Calculate the SCSI LBA, transfer length and FUA. */
1675 switch (cdb[0]) {
1676 case READ_10:
1677 case WRITE_10:
1678 if (unlikely(scmd->cmd_len < 10))
1679 goto invalid_fld;
1680 scsi_10_lba_len(cdb, &block, &n_block);
1681 if (cdb[1] & (1 << 3))
1682 tf_flags |= ATA_TFLAG_FUA;
1683 break;
1684 case READ_6:
1685 case WRITE_6:
1686 if (unlikely(scmd->cmd_len < 6))
1687 goto invalid_fld;
1688 scsi_6_lba_len(cdb, &block, &n_block);
1689
1690 /* for 6-byte r/w commands, transfer length 0
1691 * means 256 blocks of data, not 0 block.
1692 */
1693 if (!n_block)
1694 n_block = 256;
1695 break;
1696 case READ_16:
1697 case WRITE_16:
1698 if (unlikely(scmd->cmd_len < 16))
1699 goto invalid_fld;
1700 scsi_16_lba_len(cdb, &block, &n_block);
1701 if (cdb[1] & (1 << 3))
1702 tf_flags |= ATA_TFLAG_FUA;
1703 break;
1704 default:
1705 DPRINTK("no-byte command\n");
1706 goto invalid_fld;
1707 }
1708
1709 /* Check and compose ATA command */
1710 if (!n_block)
1711 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1712 * length 0 means transfer 0 block of data.
1713 * However, for ATA R/W commands, sector count 0 means
1714 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1715 *
1716 * WARNING: one or two older ATA drives treat 0 as 0...
1717 */
1718 goto nothing_to_do;
1719
1720 qc->flags |= ATA_QCFLAG_IO;
1721 qc->nbytes = n_block * scmd->device->sector_size;
1722
1723 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1724 qc->tag);
1725 if (likely(rc == 0))
1726 return 0;
1727
1728 if (rc == -ERANGE)
1729 goto out_of_range;
1730 /* treat all other errors as -EINVAL, fall through */
1731 invalid_fld:
1732 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1733 /* "Invalid field in cbd" */
1734 return 1;
1735
1736 out_of_range:
1737 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1738 /* "Logical Block Address out of range" */
1739 return 1;
1740
1741 nothing_to_do:
1742 scmd->result = SAM_STAT_GOOD;
1743 return 1;
1744 }
1745
1746 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1747 {
1748 struct ata_port *ap = qc->ap;
1749 struct scsi_cmnd *cmd = qc->scsicmd;
1750 u8 *cdb = cmd->cmnd;
1751 int need_sense = (qc->err_mask != 0);
1752
1753 /* For ATA pass thru (SAT) commands, generate a sense block if
1754 * user mandated it or if there's an error. Note that if we
1755 * generate because the user forced us to [CK_COND =1], a check
1756 * condition is generated and the ATA register values are returned
1757 * whether the command completed successfully or not. If there
1758 * was no error, we use the following sense data:
1759 * sk = RECOVERED ERROR
1760 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
1761 */
1762 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1763 ((cdb[2] & 0x20) || need_sense)) {
1764 ata_gen_passthru_sense(qc);
1765 } else {
1766 if (!need_sense) {
1767 cmd->result = SAM_STAT_GOOD;
1768 } else {
1769 /* TODO: decide which descriptor format to use
1770 * for 48b LBA devices and call that here
1771 * instead of the fixed desc, which is only
1772 * good for smaller LBA (and maybe CHS?)
1773 * devices.
1774 */
1775 ata_gen_ata_sense(qc);
1776 }
1777 }
1778
1779 if (need_sense && !ap->ops->error_handler)
1780 ata_dump_status(ap->print_id, &qc->result_tf);
1781
1782 qc->scsidone(cmd);
1783
1784 ata_qc_free(qc);
1785 }
1786
1787 /**
1788 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1789 * @dev: ATA device to which the command is addressed
1790 * @cmd: SCSI command to execute
1791 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1792 *
1793 * Our ->queuecommand() function has decided that the SCSI
1794 * command issued can be directly translated into an ATA
1795 * command, rather than handled internally.
1796 *
1797 * This function sets up an ata_queued_cmd structure for the
1798 * SCSI command, and sends that ata_queued_cmd to the hardware.
1799 *
1800 * The xlat_func argument (actor) returns 0 if ready to execute
1801 * ATA command, else 1 to finish translation. If 1 is returned
1802 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1803 * to be set reflecting an error condition or clean (early)
1804 * termination.
1805 *
1806 * LOCKING:
1807 * spin_lock_irqsave(host lock)
1808 *
1809 * RETURNS:
1810 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1811 * needs to be deferred.
1812 */
1813 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1814 ata_xlat_func_t xlat_func)
1815 {
1816 struct ata_port *ap = dev->link->ap;
1817 struct ata_queued_cmd *qc;
1818 int rc;
1819
1820 VPRINTK("ENTER\n");
1821
1822 qc = ata_scsi_qc_new(dev, cmd);
1823 if (!qc)
1824 goto err_mem;
1825
1826 /* data is present; dma-map it */
1827 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1828 cmd->sc_data_direction == DMA_TO_DEVICE) {
1829 if (unlikely(scsi_bufflen(cmd) < 1)) {
1830 ata_dev_warn(dev, "WARNING: zero len r/w req\n");
1831 goto err_did;
1832 }
1833
1834 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1835
1836 qc->dma_dir = cmd->sc_data_direction;
1837 }
1838
1839 qc->complete_fn = ata_scsi_qc_complete;
1840
1841 if (xlat_func(qc))
1842 goto early_finish;
1843
1844 if (ap->ops->qc_defer) {
1845 if ((rc = ap->ops->qc_defer(qc)))
1846 goto defer;
1847 }
1848
1849 /* select device, send command to hardware */
1850 ata_qc_issue(qc);
1851
1852 VPRINTK("EXIT\n");
1853 return 0;
1854
1855 early_finish:
1856 ata_qc_free(qc);
1857 cmd->scsi_done(cmd);
1858 DPRINTK("EXIT - early finish (good or error)\n");
1859 return 0;
1860
1861 err_did:
1862 ata_qc_free(qc);
1863 cmd->result = (DID_ERROR << 16);
1864 cmd->scsi_done(cmd);
1865 err_mem:
1866 DPRINTK("EXIT - internal\n");
1867 return 0;
1868
1869 defer:
1870 ata_qc_free(qc);
1871 DPRINTK("EXIT - defer\n");
1872 if (rc == ATA_DEFER_LINK)
1873 return SCSI_MLQUEUE_DEVICE_BUSY;
1874 else
1875 return SCSI_MLQUEUE_HOST_BUSY;
1876 }
1877
1878 /**
1879 * ata_scsi_rbuf_get - Map response buffer.
1880 * @cmd: SCSI command containing buffer to be mapped.
1881 * @flags: unsigned long variable to store irq enable status
1882 * @copy_in: copy in from user buffer
1883 *
1884 * Prepare buffer for simulated SCSI commands.
1885 *
1886 * LOCKING:
1887 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1888 *
1889 * RETURNS:
1890 * Pointer to response buffer.
1891 */
1892 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1893 unsigned long *flags)
1894 {
1895 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1896
1897 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1898 if (copy_in)
1899 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1900 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1901 return ata_scsi_rbuf;
1902 }
1903
1904 /**
1905 * ata_scsi_rbuf_put - Unmap response buffer.
1906 * @cmd: SCSI command containing buffer to be unmapped.
1907 * @copy_out: copy out result
1908 * @flags: @flags passed to ata_scsi_rbuf_get()
1909 *
1910 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1911 * @copy_back is true.
1912 *
1913 * LOCKING:
1914 * Unlocks ata_scsi_rbuf_lock.
1915 */
1916 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1917 unsigned long *flags)
1918 {
1919 if (copy_out)
1920 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1921 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1922 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1923 }
1924
1925 /**
1926 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1927 * @args: device IDENTIFY data / SCSI command of interest.
1928 * @actor: Callback hook for desired SCSI command simulator
1929 *
1930 * Takes care of the hard work of simulating a SCSI command...
1931 * Mapping the response buffer, calling the command's handler,
1932 * and handling the handler's return value. This return value
1933 * indicates whether the handler wishes the SCSI command to be
1934 * completed successfully (0), or not (in which case cmd->result
1935 * and sense buffer are assumed to be set).
1936 *
1937 * LOCKING:
1938 * spin_lock_irqsave(host lock)
1939 */
1940 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1941 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1942 {
1943 u8 *rbuf;
1944 unsigned int rc;
1945 struct scsi_cmnd *cmd = args->cmd;
1946 unsigned long flags;
1947
1948 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1949 rc = actor(args, rbuf);
1950 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
1951
1952 if (rc == 0)
1953 cmd->result = SAM_STAT_GOOD;
1954 args->done(cmd);
1955 }
1956
1957 /**
1958 * ata_scsiop_inq_std - Simulate INQUIRY command
1959 * @args: device IDENTIFY data / SCSI command of interest.
1960 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1961 *
1962 * Returns standard device identification data associated
1963 * with non-VPD INQUIRY command output.
1964 *
1965 * LOCKING:
1966 * spin_lock_irqsave(host lock)
1967 */
1968 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1969 {
1970 const u8 versions[] = {
1971 0x60, /* SAM-3 (no version claimed) */
1972
1973 0x03,
1974 0x20, /* SBC-2 (no version claimed) */
1975
1976 0x02,
1977 0x60 /* SPC-3 (no version claimed) */
1978 };
1979 u8 hdr[] = {
1980 TYPE_DISK,
1981 0,
1982 0x5, /* claim SPC-3 version compatibility */
1983 2,
1984 95 - 4
1985 };
1986
1987 VPRINTK("ENTER\n");
1988
1989 /* set scsi removeable (RMB) bit per ata bit */
1990 if (ata_id_removeable(args->id))
1991 hdr[1] |= (1 << 7);
1992
1993 memcpy(rbuf, hdr, sizeof(hdr));
1994 memcpy(&rbuf[8], "ATA ", 8);
1995 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1996 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1997
1998 if (rbuf[32] == 0 || rbuf[32] == ' ')
1999 memcpy(&rbuf[32], "n/a ", 4);
2000
2001 memcpy(rbuf + 59, versions, sizeof(versions));
2002
2003 return 0;
2004 }
2005
2006 /**
2007 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
2008 * @args: device IDENTIFY data / SCSI command of interest.
2009 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2010 *
2011 * Returns list of inquiry VPD pages available.
2012 *
2013 * LOCKING:
2014 * spin_lock_irqsave(host lock)
2015 */
2016 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
2017 {
2018 const u8 pages[] = {
2019 0x00, /* page 0x00, this page */
2020 0x80, /* page 0x80, unit serial no page */
2021 0x83, /* page 0x83, device ident page */
2022 0x89, /* page 0x89, ata info page */
2023 0xb0, /* page 0xb0, block limits page */
2024 0xb1, /* page 0xb1, block device characteristics page */
2025 0xb2, /* page 0xb2, thin provisioning page */
2026 };
2027
2028 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
2029 memcpy(rbuf + 4, pages, sizeof(pages));
2030 return 0;
2031 }
2032
2033 /**
2034 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
2035 * @args: device IDENTIFY data / SCSI command of interest.
2036 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2037 *
2038 * Returns ATA device serial number.
2039 *
2040 * LOCKING:
2041 * spin_lock_irqsave(host lock)
2042 */
2043 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
2044 {
2045 const u8 hdr[] = {
2046 0,
2047 0x80, /* this page code */
2048 0,
2049 ATA_ID_SERNO_LEN, /* page len */
2050 };
2051
2052 memcpy(rbuf, hdr, sizeof(hdr));
2053 ata_id_string(args->id, (unsigned char *) &rbuf[4],
2054 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2055 return 0;
2056 }
2057
2058 /**
2059 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2060 * @args: device IDENTIFY data / SCSI command of interest.
2061 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2062 *
2063 * Yields two logical unit device identification designators:
2064 * - vendor specific ASCII containing the ATA serial number
2065 * - SAT defined "t10 vendor id based" containing ASCII vendor
2066 * name ("ATA "), model and serial numbers.
2067 *
2068 * LOCKING:
2069 * spin_lock_irqsave(host lock)
2070 */
2071 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
2072 {
2073 const int sat_model_serial_desc_len = 68;
2074 int num;
2075
2076 rbuf[1] = 0x83; /* this page code */
2077 num = 4;
2078
2079 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2080 rbuf[num + 0] = 2;
2081 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2082 num += 4;
2083 ata_id_string(args->id, (unsigned char *) rbuf + num,
2084 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2085 num += ATA_ID_SERNO_LEN;
2086
2087 /* SAT defined lu model and serial numbers descriptor */
2088 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2089 rbuf[num + 0] = 2;
2090 rbuf[num + 1] = 1;
2091 rbuf[num + 3] = sat_model_serial_desc_len;
2092 num += 4;
2093 memcpy(rbuf + num, "ATA ", 8);
2094 num += 8;
2095 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2096 ATA_ID_PROD_LEN);
2097 num += ATA_ID_PROD_LEN;
2098 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2099 ATA_ID_SERNO_LEN);
2100 num += ATA_ID_SERNO_LEN;
2101
2102 if (ata_id_has_wwn(args->id)) {
2103 /* SAT defined lu world wide name */
2104 /* piv=0, assoc=lu, code_set=binary, designator=NAA */
2105 rbuf[num + 0] = 1;
2106 rbuf[num + 1] = 3;
2107 rbuf[num + 3] = ATA_ID_WWN_LEN;
2108 num += 4;
2109 ata_id_string(args->id, (unsigned char *) rbuf + num,
2110 ATA_ID_WWN, ATA_ID_WWN_LEN);
2111 num += ATA_ID_WWN_LEN;
2112 }
2113 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
2114 return 0;
2115 }
2116
2117 /**
2118 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2119 * @args: device IDENTIFY data / SCSI command of interest.
2120 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2121 *
2122 * Yields SAT-specified ATA VPD page.
2123 *
2124 * LOCKING:
2125 * spin_lock_irqsave(host lock)
2126 */
2127 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
2128 {
2129 struct ata_taskfile tf;
2130
2131 memset(&tf, 0, sizeof(tf));
2132
2133 rbuf[1] = 0x89; /* our page code */
2134 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2135 rbuf[3] = (0x238 & 0xff);
2136
2137 memcpy(&rbuf[8], "linux ", 8);
2138 memcpy(&rbuf[16], "libata ", 16);
2139 memcpy(&rbuf[32], DRV_VERSION, 4);
2140
2141 /* we don't store the ATA device signature, so we fake it */
2142
2143 tf.command = ATA_DRDY; /* really, this is Status reg */
2144 tf.lbal = 0x1;
2145 tf.nsect = 0x1;
2146
2147 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2148 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
2149
2150 rbuf[56] = ATA_CMD_ID_ATA;
2151
2152 memcpy(&rbuf[60], &args->id[0], 512);
2153 return 0;
2154 }
2155
2156 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
2157 {
2158 u16 min_io_sectors;
2159
2160 rbuf[1] = 0xb0;
2161 rbuf[3] = 0x3c; /* required VPD size with unmap support */
2162
2163 /*
2164 * Optimal transfer length granularity.
2165 *
2166 * This is always one physical block, but for disks with a smaller
2167 * logical than physical sector size we need to figure out what the
2168 * latter is.
2169 */
2170 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
2171 put_unaligned_be16(min_io_sectors, &rbuf[6]);
2172
2173 /*
2174 * Optimal unmap granularity.
2175 *
2176 * The ATA spec doesn't even know about a granularity or alignment
2177 * for the TRIM command. We can leave away most of the unmap related
2178 * VPD page entries, but we have specifify a granularity to signal
2179 * that we support some form of unmap - in thise case via WRITE SAME
2180 * with the unmap bit set.
2181 */
2182 if (ata_id_has_trim(args->id)) {
2183 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
2184 put_unaligned_be32(1, &rbuf[28]);
2185 }
2186
2187 return 0;
2188 }
2189
2190 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2191 {
2192 int form_factor = ata_id_form_factor(args->id);
2193 int media_rotation_rate = ata_id_rotation_rate(args->id);
2194
2195 rbuf[1] = 0xb1;
2196 rbuf[3] = 0x3c;
2197 rbuf[4] = media_rotation_rate >> 8;
2198 rbuf[5] = media_rotation_rate;
2199 rbuf[7] = form_factor;
2200
2201 return 0;
2202 }
2203
2204 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
2205 {
2206 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2207 rbuf[1] = 0xb2;
2208 rbuf[3] = 0x4;
2209 rbuf[5] = 1 << 6; /* TPWS */
2210
2211 return 0;
2212 }
2213
2214 /**
2215 * ata_scsiop_noop - Command handler that simply returns success.
2216 * @args: device IDENTIFY data / SCSI command of interest.
2217 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2218 *
2219 * No operation. Simply returns success to caller, to indicate
2220 * that the caller should successfully complete this SCSI command.
2221 *
2222 * LOCKING:
2223 * spin_lock_irqsave(host lock)
2224 */
2225 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
2226 {
2227 VPRINTK("ENTER\n");
2228 return 0;
2229 }
2230
2231 /**
2232 * modecpy - Prepare response for MODE SENSE
2233 * @dest: output buffer
2234 * @src: data being copied
2235 * @n: length of mode page
2236 * @changeable: whether changeable parameters are requested
2237 *
2238 * Generate a generic MODE SENSE page for either current or changeable
2239 * parameters.
2240 *
2241 * LOCKING:
2242 * None.
2243 */
2244 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
2245 {
2246 if (changeable) {
2247 memcpy(dest, src, 2);
2248 memset(dest + 2, 0, n - 2);
2249 } else {
2250 memcpy(dest, src, n);
2251 }
2252 }
2253
2254 /**
2255 * ata_msense_caching - Simulate MODE SENSE caching info page
2256 * @id: device IDENTIFY data
2257 * @buf: output buffer
2258 * @changeable: whether changeable parameters are requested
2259 *
2260 * Generate a caching info page, which conditionally indicates
2261 * write caching to the SCSI layer, depending on device
2262 * capabilities.
2263 *
2264 * LOCKING:
2265 * None.
2266 */
2267 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
2268 {
2269 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
2270 if (changeable || ata_id_wcache_enabled(id))
2271 buf[2] |= (1 << 2); /* write cache enable */
2272 if (!changeable && !ata_id_rahead_enabled(id))
2273 buf[12] |= (1 << 5); /* disable read ahead */
2274 return sizeof(def_cache_mpage);
2275 }
2276
2277 /**
2278 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2279 * @buf: output buffer
2280 * @changeable: whether changeable parameters are requested
2281 *
2282 * Generate a generic MODE SENSE control mode page.
2283 *
2284 * LOCKING:
2285 * None.
2286 */
2287 static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable)
2288 {
2289 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable);
2290 return sizeof(def_control_mpage);
2291 }
2292
2293 /**
2294 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2295 * @buf: output buffer
2296 * @changeable: whether changeable parameters are requested
2297 *
2298 * Generate a generic MODE SENSE r/w error recovery page.
2299 *
2300 * LOCKING:
2301 * None.
2302 */
2303 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable)
2304 {
2305 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage),
2306 changeable);
2307 return sizeof(def_rw_recovery_mpage);
2308 }
2309
2310 /*
2311 * We can turn this into a real blacklist if it's needed, for now just
2312 * blacklist any Maxtor BANC1G10 revision firmware
2313 */
2314 static int ata_dev_supports_fua(u16 *id)
2315 {
2316 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2317
2318 if (!libata_fua)
2319 return 0;
2320 if (!ata_id_has_fua(id))
2321 return 0;
2322
2323 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2324 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2325
2326 if (strcmp(model, "Maxtor"))
2327 return 1;
2328 if (strcmp(fw, "BANC1G10"))
2329 return 1;
2330
2331 return 0; /* blacklisted */
2332 }
2333
2334 /**
2335 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2336 * @args: device IDENTIFY data / SCSI command of interest.
2337 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2338 *
2339 * Simulate MODE SENSE commands. Assume this is invoked for direct
2340 * access devices (e.g. disks) only. There should be no block
2341 * descriptor for other device types.
2342 *
2343 * LOCKING:
2344 * spin_lock_irqsave(host lock)
2345 */
2346 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
2347 {
2348 struct ata_device *dev = args->dev;
2349 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
2350 const u8 sat_blk_desc[] = {
2351 0, 0, 0, 0, /* number of blocks: sat unspecified */
2352 0,
2353 0, 0x2, 0x0 /* block length: 512 bytes */
2354 };
2355 u8 pg, spg;
2356 unsigned int ebd, page_control, six_byte;
2357 u8 dpofua;
2358
2359 VPRINTK("ENTER\n");
2360
2361 six_byte = (scsicmd[0] == MODE_SENSE);
2362 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2363 /*
2364 * LLBA bit in msense(10) ignored (compliant)
2365 */
2366
2367 page_control = scsicmd[2] >> 6;
2368 switch (page_control) {
2369 case 0: /* current */
2370 case 1: /* changeable */
2371 case 2: /* defaults */
2372 break; /* supported */
2373 case 3: /* saved */
2374 goto saving_not_supp;
2375 default:
2376 goto invalid_fld;
2377 }
2378
2379 if (six_byte)
2380 p += 4 + (ebd ? 8 : 0);
2381 else
2382 p += 8 + (ebd ? 8 : 0);
2383
2384 pg = scsicmd[2] & 0x3f;
2385 spg = scsicmd[3];
2386 /*
2387 * No mode subpages supported (yet) but asking for _all_
2388 * subpages may be valid
2389 */
2390 if (spg && (spg != ALL_SUB_MPAGES))
2391 goto invalid_fld;
2392
2393 switch(pg) {
2394 case RW_RECOVERY_MPAGE:
2395 p += ata_msense_rw_recovery(p, page_control == 1);
2396 break;
2397
2398 case CACHE_MPAGE:
2399 p += ata_msense_caching(args->id, p, page_control == 1);
2400 break;
2401
2402 case CONTROL_MPAGE:
2403 p += ata_msense_ctl_mode(p, page_control == 1);
2404 break;
2405
2406 case ALL_MPAGES:
2407 p += ata_msense_rw_recovery(p, page_control == 1);
2408 p += ata_msense_caching(args->id, p, page_control == 1);
2409 p += ata_msense_ctl_mode(p, page_control == 1);
2410 break;
2411
2412 default: /* invalid page code */
2413 goto invalid_fld;
2414 }
2415
2416 dpofua = 0;
2417 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2418 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2419 dpofua = 1 << 4;
2420
2421 if (six_byte) {
2422 rbuf[0] = p - rbuf - 1;
2423 rbuf[2] |= dpofua;
2424 if (ebd) {
2425 rbuf[3] = sizeof(sat_blk_desc);
2426 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2427 }
2428 } else {
2429 unsigned int output_len = p - rbuf - 2;
2430
2431 rbuf[0] = output_len >> 8;
2432 rbuf[1] = output_len;
2433 rbuf[3] |= dpofua;
2434 if (ebd) {
2435 rbuf[7] = sizeof(sat_blk_desc);
2436 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2437 }
2438 }
2439 return 0;
2440
2441 invalid_fld:
2442 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2443 /* "Invalid field in cbd" */
2444 return 1;
2445
2446 saving_not_supp:
2447 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2448 /* "Saving parameters not supported" */
2449 return 1;
2450 }
2451
2452 /**
2453 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2454 * @args: device IDENTIFY data / SCSI command of interest.
2455 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2456 *
2457 * Simulate READ CAPACITY commands.
2458 *
2459 * LOCKING:
2460 * None.
2461 */
2462 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
2463 {
2464 struct ata_device *dev = args->dev;
2465 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
2466 u32 sector_size; /* physical sector size in bytes */
2467 u8 log2_per_phys;
2468 u16 lowest_aligned;
2469
2470 sector_size = ata_id_logical_sector_size(dev->id);
2471 log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2472 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
2473
2474 VPRINTK("ENTER\n");
2475
2476 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2477 if (last_lba >= 0xffffffffULL)
2478 last_lba = 0xffffffff;
2479
2480 /* sector count, 32-bit */
2481 rbuf[0] = last_lba >> (8 * 3);
2482 rbuf[1] = last_lba >> (8 * 2);
2483 rbuf[2] = last_lba >> (8 * 1);
2484 rbuf[3] = last_lba;
2485
2486 /* sector size */
2487 rbuf[4] = sector_size >> (8 * 3);
2488 rbuf[5] = sector_size >> (8 * 2);
2489 rbuf[6] = sector_size >> (8 * 1);
2490 rbuf[7] = sector_size;
2491 } else {
2492 /* sector count, 64-bit */
2493 rbuf[0] = last_lba >> (8 * 7);
2494 rbuf[1] = last_lba >> (8 * 6);
2495 rbuf[2] = last_lba >> (8 * 5);
2496 rbuf[3] = last_lba >> (8 * 4);
2497 rbuf[4] = last_lba >> (8 * 3);
2498 rbuf[5] = last_lba >> (8 * 2);
2499 rbuf[6] = last_lba >> (8 * 1);
2500 rbuf[7] = last_lba;
2501
2502 /* sector size */
2503 rbuf[ 8] = sector_size >> (8 * 3);
2504 rbuf[ 9] = sector_size >> (8 * 2);
2505 rbuf[10] = sector_size >> (8 * 1);
2506 rbuf[11] = sector_size;
2507
2508 rbuf[12] = 0;
2509 rbuf[13] = log2_per_phys;
2510 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2511 rbuf[15] = lowest_aligned;
2512
2513 if (ata_id_has_trim(args->id)) {
2514 rbuf[14] |= 0x80; /* TPE */
2515
2516 if (ata_id_has_zero_after_trim(args->id))
2517 rbuf[14] |= 0x40; /* TPRZ */
2518 }
2519 }
2520
2521 return 0;
2522 }
2523
2524 /**
2525 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2526 * @args: device IDENTIFY data / SCSI command of interest.
2527 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2528 *
2529 * Simulate REPORT LUNS command.
2530 *
2531 * LOCKING:
2532 * spin_lock_irqsave(host lock)
2533 */
2534 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
2535 {
2536 VPRINTK("ENTER\n");
2537 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2538
2539 return 0;
2540 }
2541
2542 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2543 {
2544 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2545 /* FIXME: not quite right; we don't want the
2546 * translation of taskfile registers into
2547 * a sense descriptors, since that's only
2548 * correct for ATA, not ATAPI
2549 */
2550 ata_gen_passthru_sense(qc);
2551 }
2552
2553 qc->scsidone(qc->scsicmd);
2554 ata_qc_free(qc);
2555 }
2556
2557 /* is it pointless to prefer PIO for "safety reasons"? */
2558 static inline int ata_pio_use_silly(struct ata_port *ap)
2559 {
2560 return (ap->flags & ATA_FLAG_PIO_DMA);
2561 }
2562
2563 static void atapi_request_sense(struct ata_queued_cmd *qc)
2564 {
2565 struct ata_port *ap = qc->ap;
2566 struct scsi_cmnd *cmd = qc->scsicmd;
2567
2568 DPRINTK("ATAPI request sense\n");
2569
2570 /* FIXME: is this needed? */
2571 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2572
2573 #ifdef CONFIG_ATA_SFF
2574 if (ap->ops->sff_tf_read)
2575 ap->ops->sff_tf_read(ap, &qc->tf);
2576 #endif
2577
2578 /* fill these in, for the case where they are -not- overwritten */
2579 cmd->sense_buffer[0] = 0x70;
2580 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2581
2582 ata_qc_reinit(qc);
2583
2584 /* setup sg table and init transfer direction */
2585 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2586 ata_sg_init(qc, &qc->sgent, 1);
2587 qc->dma_dir = DMA_FROM_DEVICE;
2588
2589 memset(&qc->cdb, 0, qc->dev->cdb_len);
2590 qc->cdb[0] = REQUEST_SENSE;
2591 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2592
2593 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2594 qc->tf.command = ATA_CMD_PACKET;
2595
2596 if (ata_pio_use_silly(ap)) {
2597 qc->tf.protocol = ATAPI_PROT_DMA;
2598 qc->tf.feature |= ATAPI_PKT_DMA;
2599 } else {
2600 qc->tf.protocol = ATAPI_PROT_PIO;
2601 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2602 qc->tf.lbah = 0;
2603 }
2604 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2605
2606 qc->complete_fn = atapi_sense_complete;
2607
2608 ata_qc_issue(qc);
2609
2610 DPRINTK("EXIT\n");
2611 }
2612
2613 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2614 {
2615 struct scsi_cmnd *cmd = qc->scsicmd;
2616 unsigned int err_mask = qc->err_mask;
2617
2618 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2619
2620 /* handle completion from new EH */
2621 if (unlikely(qc->ap->ops->error_handler &&
2622 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2623
2624 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2625 /* FIXME: not quite right; we don't want the
2626 * translation of taskfile registers into a
2627 * sense descriptors, since that's only
2628 * correct for ATA, not ATAPI
2629 */
2630 ata_gen_passthru_sense(qc);
2631 }
2632
2633 /* SCSI EH automatically locks door if sdev->locked is
2634 * set. Sometimes door lock request continues to
2635 * fail, for example, when no media is present. This
2636 * creates a loop - SCSI EH issues door lock which
2637 * fails and gets invoked again to acquire sense data
2638 * for the failed command.
2639 *
2640 * If door lock fails, always clear sdev->locked to
2641 * avoid this infinite loop.
2642 *
2643 * This may happen before SCSI scan is complete. Make
2644 * sure qc->dev->sdev isn't NULL before dereferencing.
2645 */
2646 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
2647 qc->dev->sdev->locked = 0;
2648
2649 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2650 qc->scsidone(cmd);
2651 ata_qc_free(qc);
2652 return;
2653 }
2654
2655 /* successful completion or old EH failure path */
2656 if (unlikely(err_mask & AC_ERR_DEV)) {
2657 cmd->result = SAM_STAT_CHECK_CONDITION;
2658 atapi_request_sense(qc);
2659 return;
2660 } else if (unlikely(err_mask)) {
2661 /* FIXME: not quite right; we don't want the
2662 * translation of taskfile registers into
2663 * a sense descriptors, since that's only
2664 * correct for ATA, not ATAPI
2665 */
2666 ata_gen_passthru_sense(qc);
2667 } else {
2668 u8 *scsicmd = cmd->cmnd;
2669
2670 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2671 unsigned long flags;
2672 u8 *buf;
2673
2674 buf = ata_scsi_rbuf_get(cmd, true, &flags);
2675
2676 /* ATAPI devices typically report zero for their SCSI version,
2677 * and sometimes deviate from the spec WRT response data
2678 * format. If SCSI version is reported as zero like normal,
2679 * then we make the following fixups: 1) Fake MMC-5 version,
2680 * to indicate to the Linux scsi midlayer this is a modern
2681 * device. 2) Ensure response data format / ATAPI information
2682 * are always correct.
2683 */
2684 if (buf[2] == 0) {
2685 buf[2] = 0x5;
2686 buf[3] = 0x32;
2687 }
2688
2689 ata_scsi_rbuf_put(cmd, true, &flags);
2690 }
2691
2692 cmd->result = SAM_STAT_GOOD;
2693 }
2694
2695 qc->scsidone(cmd);
2696 ata_qc_free(qc);
2697 }
2698 /**
2699 * atapi_xlat - Initialize PACKET taskfile
2700 * @qc: command structure to be initialized
2701 *
2702 * LOCKING:
2703 * spin_lock_irqsave(host lock)
2704 *
2705 * RETURNS:
2706 * Zero on success, non-zero on failure.
2707 */
2708 static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2709 {
2710 struct scsi_cmnd *scmd = qc->scsicmd;
2711 struct ata_device *dev = qc->dev;
2712 int nodata = (scmd->sc_data_direction == DMA_NONE);
2713 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2714 unsigned int nbytes;
2715
2716 memset(qc->cdb, 0, dev->cdb_len);
2717 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2718
2719 qc->complete_fn = atapi_qc_complete;
2720
2721 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2722 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2723 qc->tf.flags |= ATA_TFLAG_WRITE;
2724 DPRINTK("direction: write\n");
2725 }
2726
2727 qc->tf.command = ATA_CMD_PACKET;
2728 ata_qc_set_pc_nbytes(qc);
2729
2730 /* check whether ATAPI DMA is safe */
2731 if (!nodata && !using_pio && atapi_check_dma(qc))
2732 using_pio = 1;
2733
2734 /* Some controller variants snoop this value for Packet
2735 * transfers to do state machine and FIFO management. Thus we
2736 * want to set it properly, and for DMA where it is
2737 * effectively meaningless.
2738 */
2739 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2740
2741 /* Most ATAPI devices which honor transfer chunk size don't
2742 * behave according to the spec when odd chunk size which
2743 * matches the transfer length is specified. If the number of
2744 * bytes to transfer is 2n+1. According to the spec, what
2745 * should happen is to indicate that 2n+1 is going to be
2746 * transferred and transfer 2n+2 bytes where the last byte is
2747 * padding.
2748 *
2749 * In practice, this doesn't happen. ATAPI devices first
2750 * indicate and transfer 2n bytes and then indicate and
2751 * transfer 2 bytes where the last byte is padding.
2752 *
2753 * This inconsistency confuses several controllers which
2754 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2755 * These controllers use actual number of transferred bytes to
2756 * update DMA poitner and transfer of 4n+2 bytes make those
2757 * controller push DMA pointer by 4n+4 bytes because SATA data
2758 * FISes are aligned to 4 bytes. This causes data corruption
2759 * and buffer overrun.
2760 *
2761 * Always setting nbytes to even number solves this problem
2762 * because then ATAPI devices don't have to split data at 2n
2763 * boundaries.
2764 */
2765 if (nbytes & 0x1)
2766 nbytes++;
2767
2768 qc->tf.lbam = (nbytes & 0xFF);
2769 qc->tf.lbah = (nbytes >> 8);
2770
2771 if (nodata)
2772 qc->tf.protocol = ATAPI_PROT_NODATA;
2773 else if (using_pio)
2774 qc->tf.protocol = ATAPI_PROT_PIO;
2775 else {
2776 /* DMA data xfer */
2777 qc->tf.protocol = ATAPI_PROT_DMA;
2778 qc->tf.feature |= ATAPI_PKT_DMA;
2779
2780 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2781 (scmd->sc_data_direction != DMA_TO_DEVICE))
2782 /* some SATA bridges need us to indicate data xfer direction */
2783 qc->tf.feature |= ATAPI_DMADIR;
2784 }
2785
2786
2787 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2788 as ATAPI tape drives don't get this right otherwise */
2789 return 0;
2790 }
2791
2792 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2793 {
2794 if (!sata_pmp_attached(ap)) {
2795 if (likely(devno < ata_link_max_devices(&ap->link)))
2796 return &ap->link.device[devno];
2797 } else {
2798 if (likely(devno < ap->nr_pmp_links))
2799 return &ap->pmp_link[devno].device[0];
2800 }
2801
2802 return NULL;
2803 }
2804
2805 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2806 const struct scsi_device *scsidev)
2807 {
2808 int devno;
2809
2810 /* skip commands not addressed to targets we simulate */
2811 if (!sata_pmp_attached(ap)) {
2812 if (unlikely(scsidev->channel || scsidev->lun))
2813 return NULL;
2814 devno = scsidev->id;
2815 } else {
2816 if (unlikely(scsidev->id || scsidev->lun))
2817 return NULL;
2818 devno = scsidev->channel;
2819 }
2820
2821 return ata_find_dev(ap, devno);
2822 }
2823
2824 /**
2825 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2826 * @ap: ATA port to which the device is attached
2827 * @scsidev: SCSI device from which we derive the ATA device
2828 *
2829 * Given various information provided in struct scsi_cmnd,
2830 * map that onto an ATA bus, and using that mapping
2831 * determine which ata_device is associated with the
2832 * SCSI command to be sent.
2833 *
2834 * LOCKING:
2835 * spin_lock_irqsave(host lock)
2836 *
2837 * RETURNS:
2838 * Associated ATA device, or %NULL if not found.
2839 */
2840 static struct ata_device *
2841 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2842 {
2843 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2844
2845 if (unlikely(!dev || !ata_dev_enabled(dev)))
2846 return NULL;
2847
2848 return dev;
2849 }
2850
2851 /*
2852 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2853 * @byte1: Byte 1 from pass-thru CDB.
2854 *
2855 * RETURNS:
2856 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2857 */
2858 static u8
2859 ata_scsi_map_proto(u8 byte1)
2860 {
2861 switch((byte1 & 0x1e) >> 1) {
2862 case 3: /* Non-data */
2863 return ATA_PROT_NODATA;
2864
2865 case 6: /* DMA */
2866 case 10: /* UDMA Data-in */
2867 case 11: /* UDMA Data-Out */
2868 return ATA_PROT_DMA;
2869
2870 case 4: /* PIO Data-in */
2871 case 5: /* PIO Data-out */
2872 return ATA_PROT_PIO;
2873
2874 case 0: /* Hard Reset */
2875 case 1: /* SRST */
2876 case 8: /* Device Diagnostic */
2877 case 9: /* Device Reset */
2878 case 7: /* DMA Queued */
2879 case 12: /* FPDMA */
2880 case 15: /* Return Response Info */
2881 default: /* Reserved */
2882 break;
2883 }
2884
2885 return ATA_PROT_UNKNOWN;
2886 }
2887
2888 /**
2889 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2890 * @qc: command structure to be initialized
2891 *
2892 * Handles either 12 or 16-byte versions of the CDB.
2893 *
2894 * RETURNS:
2895 * Zero on success, non-zero on failure.
2896 */
2897 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2898 {
2899 struct ata_taskfile *tf = &(qc->tf);
2900 struct scsi_cmnd *scmd = qc->scsicmd;
2901 struct ata_device *dev = qc->dev;
2902 const u8 *cdb = scmd->cmnd;
2903
2904 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2905 goto invalid_fld;
2906
2907 /*
2908 * 12 and 16 byte CDBs use different offsets to
2909 * provide the various register values.
2910 */
2911 if (cdb[0] == ATA_16) {
2912 /*
2913 * 16-byte CDB - may contain extended commands.
2914 *
2915 * If that is the case, copy the upper byte register values.
2916 */
2917 if (cdb[1] & 0x01) {
2918 tf->hob_feature = cdb[3];
2919 tf->hob_nsect = cdb[5];
2920 tf->hob_lbal = cdb[7];
2921 tf->hob_lbam = cdb[9];
2922 tf->hob_lbah = cdb[11];
2923 tf->flags |= ATA_TFLAG_LBA48;
2924 } else
2925 tf->flags &= ~ATA_TFLAG_LBA48;
2926
2927 /*
2928 * Always copy low byte, device and command registers.
2929 */
2930 tf->feature = cdb[4];
2931 tf->nsect = cdb[6];
2932 tf->lbal = cdb[8];
2933 tf->lbam = cdb[10];
2934 tf->lbah = cdb[12];
2935 tf->device = cdb[13];
2936 tf->command = cdb[14];
2937 } else {
2938 /*
2939 * 12-byte CDB - incapable of extended commands.
2940 */
2941 tf->flags &= ~ATA_TFLAG_LBA48;
2942
2943 tf->feature = cdb[3];
2944 tf->nsect = cdb[4];
2945 tf->lbal = cdb[5];
2946 tf->lbam = cdb[6];
2947 tf->lbah = cdb[7];
2948 tf->device = cdb[8];
2949 tf->command = cdb[9];
2950 }
2951
2952 /* enforce correct master/slave bit */
2953 tf->device = dev->devno ?
2954 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2955
2956 switch (tf->command) {
2957 /* READ/WRITE LONG use a non-standard sect_size */
2958 case ATA_CMD_READ_LONG:
2959 case ATA_CMD_READ_LONG_ONCE:
2960 case ATA_CMD_WRITE_LONG:
2961 case ATA_CMD_WRITE_LONG_ONCE:
2962 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2963 goto invalid_fld;
2964 qc->sect_size = scsi_bufflen(scmd);
2965 break;
2966
2967 /* commands using reported Logical Block size (e.g. 512 or 4K) */
2968 case ATA_CMD_CFA_WRITE_NE:
2969 case ATA_CMD_CFA_TRANS_SECT:
2970 case ATA_CMD_CFA_WRITE_MULT_NE:
2971 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
2972 case ATA_CMD_READ:
2973 case ATA_CMD_READ_EXT:
2974 case ATA_CMD_READ_QUEUED:
2975 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
2976 case ATA_CMD_FPDMA_READ:
2977 case ATA_CMD_READ_MULTI:
2978 case ATA_CMD_READ_MULTI_EXT:
2979 case ATA_CMD_PIO_READ:
2980 case ATA_CMD_PIO_READ_EXT:
2981 case ATA_CMD_READ_STREAM_DMA_EXT:
2982 case ATA_CMD_READ_STREAM_EXT:
2983 case ATA_CMD_VERIFY:
2984 case ATA_CMD_VERIFY_EXT:
2985 case ATA_CMD_WRITE:
2986 case ATA_CMD_WRITE_EXT:
2987 case ATA_CMD_WRITE_FUA_EXT:
2988 case ATA_CMD_WRITE_QUEUED:
2989 case ATA_CMD_WRITE_QUEUED_FUA_EXT:
2990 case ATA_CMD_FPDMA_WRITE:
2991 case ATA_CMD_WRITE_MULTI:
2992 case ATA_CMD_WRITE_MULTI_EXT:
2993 case ATA_CMD_WRITE_MULTI_FUA_EXT:
2994 case ATA_CMD_PIO_WRITE:
2995 case ATA_CMD_PIO_WRITE_EXT:
2996 case ATA_CMD_WRITE_STREAM_DMA_EXT:
2997 case ATA_CMD_WRITE_STREAM_EXT:
2998 qc->sect_size = scmd->device->sector_size;
2999 break;
3000
3001 /* Everything else uses 512 byte "sectors" */
3002 default:
3003 qc->sect_size = ATA_SECT_SIZE;
3004 }
3005
3006 /*
3007 * Set flags so that all registers will be written, pass on
3008 * write indication (used for PIO/DMA setup), result TF is
3009 * copied back and we don't whine too much about its failure.
3010 */
3011 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3012 if (scmd->sc_data_direction == DMA_TO_DEVICE)
3013 tf->flags |= ATA_TFLAG_WRITE;
3014
3015 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
3016
3017 /*
3018 * Set transfer length.
3019 *
3020 * TODO: find out if we need to do more here to
3021 * cover scatter/gather case.
3022 */
3023 ata_qc_set_pc_nbytes(qc);
3024
3025 /* We may not issue DMA commands if no DMA mode is set */
3026 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
3027 goto invalid_fld;
3028
3029 /* sanity check for pio multi commands */
3030 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
3031 goto invalid_fld;
3032
3033 if (is_multi_taskfile(tf)) {
3034 unsigned int multi_count = 1 << (cdb[1] >> 5);
3035
3036 /* compare the passed through multi_count
3037 * with the cached multi_count of libata
3038 */
3039 if (multi_count != dev->multi_count)
3040 ata_dev_warn(dev, "invalid multi_count %u ignored\n",
3041 multi_count);
3042 }
3043
3044 /*
3045 * Filter SET_FEATURES - XFER MODE command -- otherwise,
3046 * SET_FEATURES - XFER MODE must be preceded/succeeded
3047 * by an update to hardware-specific registers for each
3048 * controller (i.e. the reason for ->set_piomode(),
3049 * ->set_dmamode(), and ->post_set_mode() hooks).
3050 */
3051 if (tf->command == ATA_CMD_SET_FEATURES &&
3052 tf->feature == SETFEATURES_XFER)
3053 goto invalid_fld;
3054
3055 /*
3056 * Filter TPM commands by default. These provide an
3057 * essentially uncontrolled encrypted "back door" between
3058 * applications and the disk. Set libata.allow_tpm=1 if you
3059 * have a real reason for wanting to use them. This ensures
3060 * that installed software cannot easily mess stuff up without
3061 * user intent. DVR type users will probably ship with this enabled
3062 * for movie content management.
3063 *
3064 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3065 * for this and should do in future but that it is not sufficient as
3066 * DCS is an optional feature set. Thus we also do the software filter
3067 * so that we comply with the TC consortium stated goal that the user
3068 * can turn off TC features of their system.
3069 */
3070 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
3071 goto invalid_fld;
3072
3073 return 0;
3074
3075 invalid_fld:
3076 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3077 /* "Invalid field in cdb" */
3078 return 1;
3079 }
3080
3081 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3082 {
3083 struct ata_taskfile *tf = &qc->tf;
3084 struct scsi_cmnd *scmd = qc->scsicmd;
3085 struct ata_device *dev = qc->dev;
3086 const u8 *cdb = scmd->cmnd;
3087 u64 block;
3088 u32 n_block;
3089 u32 size;
3090 void *buf;
3091
3092 /* we may not issue DMA commands if no DMA mode is set */
3093 if (unlikely(!dev->dma_mode))
3094 goto invalid_fld;
3095
3096 if (unlikely(scmd->cmd_len < 16))
3097 goto invalid_fld;
3098 scsi_16_lba_len(cdb, &block, &n_block);
3099
3100 /* for now we only support WRITE SAME with the unmap bit set */
3101 if (unlikely(!(cdb[1] & 0x8)))
3102 goto invalid_fld;
3103
3104 /*
3105 * WRITE SAME always has a sector sized buffer as payload, this
3106 * should never be a multiple entry S/G list.
3107 */
3108 if (!scsi_sg_count(scmd))
3109 goto invalid_fld;
3110
3111 buf = page_address(sg_page(scsi_sglist(scmd)));
3112 size = ata_set_lba_range_entries(buf, 512, block, n_block);
3113
3114 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) {
3115 /* Newer devices support queued TRIM commands */
3116 tf->protocol = ATA_PROT_NCQ;
3117 tf->command = ATA_CMD_FPDMA_SEND;
3118 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f;
3119 tf->nsect = qc->tag << 3;
3120 tf->hob_feature = (size / 512) >> 8;
3121 tf->feature = size / 512;
3122
3123 tf->auxiliary = 1;
3124 } else {
3125 tf->protocol = ATA_PROT_DMA;
3126 tf->hob_feature = 0;
3127 tf->feature = ATA_DSM_TRIM;
3128 tf->hob_nsect = (size / 512) >> 8;
3129 tf->nsect = size / 512;
3130 tf->command = ATA_CMD_DSM;
3131 }
3132
3133 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3134 ATA_TFLAG_WRITE;
3135
3136 ata_qc_set_pc_nbytes(qc);
3137
3138 return 0;
3139
3140 invalid_fld:
3141 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3142 /* "Invalid field in cdb" */
3143 return 1;
3144 }
3145
3146 /**
3147 * ata_mselect_caching - Simulate MODE SELECT for caching info page
3148 * @qc: Storage for translated ATA taskfile
3149 * @buf: input buffer
3150 * @len: number of valid bytes in the input buffer
3151 *
3152 * Prepare a taskfile to modify caching information for the device.
3153 *
3154 * LOCKING:
3155 * None.
3156 */
3157 static int ata_mselect_caching(struct ata_queued_cmd *qc,
3158 const u8 *buf, int len)
3159 {
3160 struct ata_taskfile *tf = &qc->tf;
3161 struct ata_device *dev = qc->dev;
3162 char mpage[CACHE_MPAGE_LEN];
3163 u8 wce;
3164
3165 /*
3166 * The first two bytes of def_cache_mpage are a header, so offsets
3167 * in mpage are off by 2 compared to buf. Same for len.
3168 */
3169
3170 if (len != CACHE_MPAGE_LEN - 2)
3171 return -EINVAL;
3172
3173 wce = buf[0] & (1 << 2);
3174
3175 /*
3176 * Check that read-only bits are not modified.
3177 */
3178 ata_msense_caching(dev->id, mpage, false);
3179 mpage[2] &= ~(1 << 2);
3180 mpage[2] |= wce;
3181 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0)
3182 return -EINVAL;
3183
3184 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3185 tf->protocol = ATA_PROT_NODATA;
3186 tf->nsect = 0;
3187 tf->command = ATA_CMD_SET_FEATURES;
3188 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF;
3189 return 0;
3190 }
3191
3192 /**
3193 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands
3194 * @qc: Storage for translated ATA taskfile
3195 *
3196 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
3197 * Assume this is invoked for direct access devices (e.g. disks) only.
3198 * There should be no block descriptor for other device types.
3199 *
3200 * LOCKING:
3201 * spin_lock_irqsave(host lock)
3202 */
3203 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
3204 {
3205 struct scsi_cmnd *scmd = qc->scsicmd;
3206 const u8 *cdb = scmd->cmnd;
3207 const u8 *p;
3208 u8 pg, spg;
3209 unsigned six_byte, pg_len, hdr_len, bd_len;
3210 int len;
3211
3212 VPRINTK("ENTER\n");
3213
3214 six_byte = (cdb[0] == MODE_SELECT);
3215 if (six_byte) {
3216 if (scmd->cmd_len < 5)
3217 goto invalid_fld;
3218
3219 len = cdb[4];
3220 hdr_len = 4;
3221 } else {
3222 if (scmd->cmd_len < 9)
3223 goto invalid_fld;
3224
3225 len = (cdb[7] << 8) + cdb[8];
3226 hdr_len = 8;
3227 }
3228
3229 /* We only support PF=1, SP=0. */
3230 if ((cdb[1] & 0x11) != 0x10)
3231 goto invalid_fld;
3232
3233 /* Test early for possible overrun. */
3234 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len)
3235 goto invalid_param_len;
3236
3237 p = page_address(sg_page(scsi_sglist(scmd)));
3238
3239 /* Move past header and block descriptors. */
3240 if (len < hdr_len)
3241 goto invalid_param_len;
3242
3243 if (six_byte)
3244 bd_len = p[3];
3245 else
3246 bd_len = (p[6] << 8) + p[7];
3247
3248 len -= hdr_len;
3249 p += hdr_len;
3250 if (len < bd_len)
3251 goto invalid_param_len;
3252 if (bd_len != 0 && bd_len != 8)
3253 goto invalid_param;
3254
3255 len -= bd_len;
3256 p += bd_len;
3257 if (len == 0)
3258 goto skip;
3259
3260 /* Parse both possible formats for the mode page headers. */
3261 pg = p[0] & 0x3f;
3262 if (p[0] & 0x40) {
3263 if (len < 4)
3264 goto invalid_param_len;
3265
3266 spg = p[1];
3267 pg_len = (p[2] << 8) | p[3];
3268 p += 4;
3269 len -= 4;
3270 } else {
3271 if (len < 2)
3272 goto invalid_param_len;
3273
3274 spg = 0;
3275 pg_len = p[1];
3276 p += 2;
3277 len -= 2;
3278 }
3279
3280 /*
3281 * No mode subpages supported (yet) but asking for _all_
3282 * subpages may be valid
3283 */
3284 if (spg && (spg != ALL_SUB_MPAGES))
3285 goto invalid_param;
3286 if (pg_len > len)
3287 goto invalid_param_len;
3288
3289 switch (pg) {
3290 case CACHE_MPAGE:
3291 if (ata_mselect_caching(qc, p, pg_len) < 0)
3292 goto invalid_param;
3293 break;
3294
3295 default: /* invalid page code */
3296 goto invalid_param;
3297 }
3298
3299 /*
3300 * Only one page has changeable data, so we only support setting one
3301 * page at a time.
3302 */
3303 if (len > pg_len)
3304 goto invalid_param;
3305
3306 return 0;
3307
3308 invalid_fld:
3309 /* "Invalid field in CDB" */
3310 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
3311 return 1;
3312
3313 invalid_param:
3314 /* "Invalid field in parameter list" */
3315 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0);
3316 return 1;
3317
3318 invalid_param_len:
3319 /* "Parameter list length error" */
3320 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3321 return 1;
3322
3323 skip:
3324 scmd->result = SAM_STAT_GOOD;
3325 return 1;
3326 }
3327
3328 /**
3329 * ata_get_xlat_func - check if SCSI to ATA translation is possible
3330 * @dev: ATA device
3331 * @cmd: SCSI command opcode to consider
3332 *
3333 * Look up the SCSI command given, and determine whether the
3334 * SCSI command is to be translated or simulated.
3335 *
3336 * RETURNS:
3337 * Pointer to translation function if possible, %NULL if not.
3338 */
3339
3340 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
3341 {
3342 switch (cmd) {
3343 case READ_6:
3344 case READ_10:
3345 case READ_16:
3346
3347 case WRITE_6:
3348 case WRITE_10:
3349 case WRITE_16:
3350 return ata_scsi_rw_xlat;
3351
3352 case WRITE_SAME_16:
3353 return ata_scsi_write_same_xlat;
3354
3355 case SYNCHRONIZE_CACHE:
3356 if (ata_try_flush_cache(dev))
3357 return ata_scsi_flush_xlat;
3358 break;
3359
3360 case VERIFY:
3361 case VERIFY_16:
3362 return ata_scsi_verify_xlat;
3363
3364 case ATA_12:
3365 case ATA_16:
3366 return ata_scsi_pass_thru;
3367
3368 case MODE_SELECT:
3369 case MODE_SELECT_10:
3370 return ata_scsi_mode_select_xlat;
3371 break;
3372
3373 case START_STOP:
3374 return ata_scsi_start_stop_xlat;
3375 }
3376
3377 return NULL;
3378 }
3379
3380 /**
3381 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3382 * @ap: ATA port to which the command was being sent
3383 * @cmd: SCSI command to dump
3384 *
3385 * Prints the contents of a SCSI command via printk().
3386 */
3387
3388 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
3389 struct scsi_cmnd *cmd)
3390 {
3391 #ifdef ATA_DEBUG
3392 struct scsi_device *scsidev = cmd->device;
3393 u8 *scsicmd = cmd->cmnd;
3394
3395 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
3396 ap->print_id,
3397 scsidev->channel, scsidev->id, scsidev->lun,
3398 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
3399 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
3400 scsicmd[8]);
3401 #endif
3402 }
3403
3404 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
3405 struct ata_device *dev)
3406 {
3407 u8 scsi_op = scmd->cmnd[0];
3408 ata_xlat_func_t xlat_func;
3409 int rc = 0;
3410
3411 if (dev->class == ATA_DEV_ATA) {
3412 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
3413 goto bad_cdb_len;
3414
3415 xlat_func = ata_get_xlat_func(dev, scsi_op);
3416 } else {
3417 if (unlikely(!scmd->cmd_len))
3418 goto bad_cdb_len;
3419
3420 xlat_func = NULL;
3421 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
3422 /* relay SCSI command to ATAPI device */
3423 int len = COMMAND_SIZE(scsi_op);
3424 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
3425 goto bad_cdb_len;
3426
3427 xlat_func = atapi_xlat;
3428 } else {
3429 /* ATA_16 passthru, treat as an ATA command */
3430 if (unlikely(scmd->cmd_len > 16))
3431 goto bad_cdb_len;
3432
3433 xlat_func = ata_get_xlat_func(dev, scsi_op);
3434 }
3435 }
3436
3437 if (xlat_func)
3438 rc = ata_scsi_translate(dev, scmd, xlat_func);
3439 else
3440 ata_scsi_simulate(dev, scmd);
3441
3442 return rc;
3443
3444 bad_cdb_len:
3445 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3446 scmd->cmd_len, scsi_op, dev->cdb_len);
3447 scmd->result = DID_ERROR << 16;
3448 scmd->scsi_done(scmd);
3449 return 0;
3450 }
3451
3452 /**
3453 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3454 * @shost: SCSI host of command to be sent
3455 * @cmd: SCSI command to be sent
3456 *
3457 * In some cases, this function translates SCSI commands into
3458 * ATA taskfiles, and queues the taskfiles to be sent to
3459 * hardware. In other cases, this function simulates a
3460 * SCSI device by evaluating and responding to certain
3461 * SCSI commands. This creates the overall effect of
3462 * ATA and ATAPI devices appearing as SCSI devices.
3463 *
3464 * LOCKING:
3465 * ATA host lock
3466 *
3467 * RETURNS:
3468 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3469 * 0 otherwise.
3470 */
3471 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
3472 {
3473 struct ata_port *ap;
3474 struct ata_device *dev;
3475 struct scsi_device *scsidev = cmd->device;
3476 int rc = 0;
3477 unsigned long irq_flags;
3478
3479 ap = ata_shost_to_port(shost);
3480
3481 spin_lock_irqsave(ap->lock, irq_flags);
3482
3483 ata_scsi_dump_cdb(ap, cmd);
3484
3485 dev = ata_scsi_find_dev(ap, scsidev);
3486 if (likely(dev))
3487 rc = __ata_scsi_queuecmd(cmd, dev);
3488 else {
3489 cmd->result = (DID_BAD_TARGET << 16);
3490 cmd->scsi_done(cmd);
3491 }
3492
3493 spin_unlock_irqrestore(ap->lock, irq_flags);
3494
3495 return rc;
3496 }
3497
3498 /**
3499 * ata_scsi_simulate - simulate SCSI command on ATA device
3500 * @dev: the target device
3501 * @cmd: SCSI command being sent to device.
3502 *
3503 * Interprets and directly executes a select list of SCSI commands
3504 * that can be handled internally.
3505 *
3506 * LOCKING:
3507 * spin_lock_irqsave(host lock)
3508 */
3509
3510 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
3511 {
3512 struct ata_scsi_args args;
3513 const u8 *scsicmd = cmd->cmnd;
3514 u8 tmp8;
3515
3516 args.dev = dev;
3517 args.id = dev->id;
3518 args.cmd = cmd;
3519 args.done = cmd->scsi_done;
3520
3521 switch(scsicmd[0]) {
3522 /* TODO: worth improving? */
3523 case FORMAT_UNIT:
3524 ata_scsi_invalid_field(cmd);
3525 break;
3526
3527 case INQUIRY:
3528 if (scsicmd[1] & 2) /* is CmdDt set? */
3529 ata_scsi_invalid_field(cmd);
3530 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3531 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3532 else switch (scsicmd[2]) {
3533 case 0x00:
3534 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3535 break;
3536 case 0x80:
3537 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3538 break;
3539 case 0x83:
3540 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3541 break;
3542 case 0x89:
3543 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3544 break;
3545 case 0xb0:
3546 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
3547 break;
3548 case 0xb1:
3549 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3550 break;
3551 case 0xb2:
3552 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
3553 break;
3554 default:
3555 ata_scsi_invalid_field(cmd);
3556 break;
3557 }
3558 break;
3559
3560 case MODE_SENSE:
3561 case MODE_SENSE_10:
3562 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3563 break;
3564
3565 case READ_CAPACITY:
3566 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3567 break;
3568
3569 case SERVICE_ACTION_IN:
3570 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3571 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3572 else
3573 ata_scsi_invalid_field(cmd);
3574 break;
3575
3576 case REPORT_LUNS:
3577 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3578 break;
3579
3580 case REQUEST_SENSE:
3581 ata_scsi_set_sense(cmd, 0, 0, 0);
3582 cmd->result = (DRIVER_SENSE << 24);
3583 cmd->scsi_done(cmd);
3584 break;
3585
3586 /* if we reach this, then writeback caching is disabled,
3587 * turning this into a no-op.
3588 */
3589 case SYNCHRONIZE_CACHE:
3590 /* fall through */
3591
3592 /* no-op's, complete with success */
3593 case REZERO_UNIT:
3594 case SEEK_6:
3595 case SEEK_10:
3596 case TEST_UNIT_READY:
3597 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3598 break;
3599
3600 case SEND_DIAGNOSTIC:
3601 tmp8 = scsicmd[1] & ~(1 << 3);
3602 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3603 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3604 else
3605 ata_scsi_invalid_field(cmd);
3606 break;
3607
3608 /* all other commands */
3609 default:
3610 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3611 /* "Invalid command operation code" */
3612 cmd->scsi_done(cmd);
3613 break;
3614 }
3615 }
3616
3617 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3618 {
3619 int i, rc;
3620
3621 for (i = 0; i < host->n_ports; i++) {
3622 struct ata_port *ap = host->ports[i];
3623 struct Scsi_Host *shost;
3624
3625 rc = -ENOMEM;
3626 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3627 if (!shost)
3628 goto err_alloc;
3629
3630 shost->eh_noresume = 1;
3631 *(struct ata_port **)&shost->hostdata[0] = ap;
3632 ap->scsi_host = shost;
3633
3634 shost->transportt = ata_scsi_transport_template;
3635 shost->unique_id = ap->print_id;
3636 shost->max_id = 16;
3637 shost->max_lun = 1;
3638 shost->max_channel = 1;
3639 shost->max_cmd_len = 16;
3640 shost->no_write_same = 1;
3641
3642 /* Schedule policy is determined by ->qc_defer()
3643 * callback and it needs to see every deferred qc.
3644 * Set host_blocked to 1 to prevent SCSI midlayer from
3645 * automatically deferring requests.
3646 */
3647 shost->max_host_blocked = 1;
3648
3649 rc = scsi_add_host_with_dma(ap->scsi_host,
3650 &ap->tdev, ap->host->dev);
3651 if (rc)
3652 goto err_add;
3653 }
3654
3655 return 0;
3656
3657 err_add:
3658 scsi_host_put(host->ports[i]->scsi_host);
3659 err_alloc:
3660 while (--i >= 0) {
3661 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3662
3663 scsi_remove_host(shost);
3664 scsi_host_put(shost);
3665 }
3666 return rc;
3667 }
3668
3669 void ata_scsi_scan_host(struct ata_port *ap, int sync)
3670 {
3671 int tries = 5;
3672 struct ata_device *last_failed_dev = NULL;
3673 struct ata_link *link;
3674 struct ata_device *dev;
3675
3676 repeat:
3677 ata_for_each_link(link, ap, EDGE) {
3678 ata_for_each_dev(dev, link, ENABLED) {
3679 struct scsi_device *sdev;
3680 int channel = 0, id = 0;
3681
3682 if (dev->sdev)
3683 continue;
3684
3685 if (ata_is_host_link(link))
3686 id = dev->devno;
3687 else
3688 channel = link->pmp;
3689
3690 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3691 NULL);
3692 if (!IS_ERR(sdev)) {
3693 dev->sdev = sdev;
3694 scsi_device_put(sdev);
3695 } else {
3696 dev->sdev = NULL;
3697 }
3698 }
3699 }
3700
3701 /* If we scanned while EH was in progress or allocation
3702 * failure occurred, scan would have failed silently. Check
3703 * whether all devices are attached.
3704 */
3705 ata_for_each_link(link, ap, EDGE) {
3706 ata_for_each_dev(dev, link, ENABLED) {
3707 if (!dev->sdev)
3708 goto exit_loop;
3709 }
3710 }
3711 exit_loop:
3712 if (!link)
3713 return;
3714
3715 /* we're missing some SCSI devices */
3716 if (sync) {
3717 /* If caller requested synchrnous scan && we've made
3718 * any progress, sleep briefly and repeat.
3719 */
3720 if (dev != last_failed_dev) {
3721 msleep(100);
3722 last_failed_dev = dev;
3723 goto repeat;
3724 }
3725
3726 /* We might be failing to detect boot device, give it
3727 * a few more chances.
3728 */
3729 if (--tries) {
3730 msleep(100);
3731 goto repeat;
3732 }
3733
3734 ata_port_err(ap,
3735 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
3736 }
3737
3738 queue_delayed_work(system_long_wq, &ap->hotplug_task,
3739 round_jiffies_relative(HZ));
3740 }
3741
3742 /**
3743 * ata_scsi_offline_dev - offline attached SCSI device
3744 * @dev: ATA device to offline attached SCSI device for
3745 *
3746 * This function is called from ata_eh_hotplug() and responsible
3747 * for taking the SCSI device attached to @dev offline. This
3748 * function is called with host lock which protects dev->sdev
3749 * against clearing.
3750 *
3751 * LOCKING:
3752 * spin_lock_irqsave(host lock)
3753 *
3754 * RETURNS:
3755 * 1 if attached SCSI device exists, 0 otherwise.
3756 */
3757 int ata_scsi_offline_dev(struct ata_device *dev)
3758 {
3759 if (dev->sdev) {
3760 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3761 return 1;
3762 }
3763 return 0;
3764 }
3765
3766 /**
3767 * ata_scsi_remove_dev - remove attached SCSI device
3768 * @dev: ATA device to remove attached SCSI device for
3769 *
3770 * This function is called from ata_eh_scsi_hotplug() and
3771 * responsible for removing the SCSI device attached to @dev.
3772 *
3773 * LOCKING:
3774 * Kernel thread context (may sleep).
3775 */
3776 static void ata_scsi_remove_dev(struct ata_device *dev)
3777 {
3778 struct ata_port *ap = dev->link->ap;
3779 struct scsi_device *sdev;
3780 unsigned long flags;
3781
3782 /* Alas, we need to grab scan_mutex to ensure SCSI device
3783 * state doesn't change underneath us and thus
3784 * scsi_device_get() always succeeds. The mutex locking can
3785 * be removed if there is __scsi_device_get() interface which
3786 * increments reference counts regardless of device state.
3787 */
3788 mutex_lock(&ap->scsi_host->scan_mutex);
3789 spin_lock_irqsave(ap->lock, flags);
3790
3791 /* clearing dev->sdev is protected by host lock */
3792 sdev = dev->sdev;
3793 dev->sdev = NULL;
3794
3795 if (sdev) {
3796 /* If user initiated unplug races with us, sdev can go
3797 * away underneath us after the host lock and
3798 * scan_mutex are released. Hold onto it.
3799 */
3800 if (scsi_device_get(sdev) == 0) {
3801 /* The following ensures the attached sdev is
3802 * offline on return from ata_scsi_offline_dev()
3803 * regardless it wins or loses the race
3804 * against this function.
3805 */
3806 scsi_device_set_state(sdev, SDEV_OFFLINE);
3807 } else {
3808 WARN_ON(1);
3809 sdev = NULL;
3810 }
3811 }
3812
3813 spin_unlock_irqrestore(ap->lock, flags);
3814 mutex_unlock(&ap->scsi_host->scan_mutex);
3815
3816 if (sdev) {
3817 ata_dev_info(dev, "detaching (SCSI %s)\n",
3818 dev_name(&sdev->sdev_gendev));
3819
3820 scsi_remove_device(sdev);
3821 scsi_device_put(sdev);
3822 }
3823 }
3824
3825 static void ata_scsi_handle_link_detach(struct ata_link *link)
3826 {
3827 struct ata_port *ap = link->ap;
3828 struct ata_device *dev;
3829
3830 ata_for_each_dev(dev, link, ALL) {
3831 unsigned long flags;
3832
3833 if (!(dev->flags & ATA_DFLAG_DETACHED))
3834 continue;
3835
3836 spin_lock_irqsave(ap->lock, flags);
3837 dev->flags &= ~ATA_DFLAG_DETACHED;
3838 spin_unlock_irqrestore(ap->lock, flags);
3839
3840 if (zpodd_dev_enabled(dev))
3841 zpodd_exit(dev);
3842
3843 ata_scsi_remove_dev(dev);
3844 }
3845 }
3846
3847 /**
3848 * ata_scsi_media_change_notify - send media change event
3849 * @dev: Pointer to the disk device with media change event
3850 *
3851 * Tell the block layer to send a media change notification
3852 * event.
3853 *
3854 * LOCKING:
3855 * spin_lock_irqsave(host lock)
3856 */
3857 void ata_scsi_media_change_notify(struct ata_device *dev)
3858 {
3859 if (dev->sdev)
3860 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3861 GFP_ATOMIC);
3862 }
3863
3864 /**
3865 * ata_scsi_hotplug - SCSI part of hotplug
3866 * @work: Pointer to ATA port to perform SCSI hotplug on
3867 *
3868 * Perform SCSI part of hotplug. It's executed from a separate
3869 * workqueue after EH completes. This is necessary because SCSI
3870 * hot plugging requires working EH and hot unplugging is
3871 * synchronized with hot plugging with a mutex.
3872 *
3873 * LOCKING:
3874 * Kernel thread context (may sleep).
3875 */
3876 void ata_scsi_hotplug(struct work_struct *work)
3877 {
3878 struct ata_port *ap =
3879 container_of(work, struct ata_port, hotplug_task.work);
3880 int i;
3881
3882 if (ap->pflags & ATA_PFLAG_UNLOADING) {
3883 DPRINTK("ENTER/EXIT - unloading\n");
3884 return;
3885 }
3886
3887 /*
3888 * XXX - UGLY HACK
3889 *
3890 * The block layer suspend/resume path is fundamentally broken due
3891 * to freezable kthreads and workqueue and may deadlock if a block
3892 * device gets removed while resume is in progress. I don't know
3893 * what the solution is short of removing freezable kthreads and
3894 * workqueues altogether.
3895 *
3896 * The following is an ugly hack to avoid kicking off device
3897 * removal while freezer is active. This is a joke but does avoid
3898 * this particular deadlock scenario.
3899 *
3900 * https://bugzilla.kernel.org/show_bug.cgi?id=62801
3901 * http://marc.info/?l=linux-kernel&m=138695698516487
3902 */
3903 #ifdef CONFIG_FREEZER
3904 while (pm_freezing)
3905 msleep(10);
3906 #endif
3907
3908 DPRINTK("ENTER\n");
3909 mutex_lock(&ap->scsi_scan_mutex);
3910
3911 /* Unplug detached devices. We cannot use link iterator here
3912 * because PMP links have to be scanned even if PMP is
3913 * currently not attached. Iterate manually.
3914 */
3915 ata_scsi_handle_link_detach(&ap->link);
3916 if (ap->pmp_link)
3917 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3918 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3919
3920 /* scan for new ones */
3921 ata_scsi_scan_host(ap, 0);
3922
3923 mutex_unlock(&ap->scsi_scan_mutex);
3924 DPRINTK("EXIT\n");
3925 }
3926
3927 /**
3928 * ata_scsi_user_scan - indication for user-initiated bus scan
3929 * @shost: SCSI host to scan
3930 * @channel: Channel to scan
3931 * @id: ID to scan
3932 * @lun: LUN to scan
3933 *
3934 * This function is called when user explicitly requests bus
3935 * scan. Set probe pending flag and invoke EH.
3936 *
3937 * LOCKING:
3938 * SCSI layer (we don't care)
3939 *
3940 * RETURNS:
3941 * Zero.
3942 */
3943 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3944 unsigned int id, unsigned int lun)
3945 {
3946 struct ata_port *ap = ata_shost_to_port(shost);
3947 unsigned long flags;
3948 int devno, rc = 0;
3949
3950 if (!ap->ops->error_handler)
3951 return -EOPNOTSUPP;
3952
3953 if (lun != SCAN_WILD_CARD && lun)
3954 return -EINVAL;
3955
3956 if (!sata_pmp_attached(ap)) {
3957 if (channel != SCAN_WILD_CARD && channel)
3958 return -EINVAL;
3959 devno = id;
3960 } else {
3961 if (id != SCAN_WILD_CARD && id)
3962 return -EINVAL;
3963 devno = channel;
3964 }
3965
3966 spin_lock_irqsave(ap->lock, flags);
3967
3968 if (devno == SCAN_WILD_CARD) {
3969 struct ata_link *link;
3970
3971 ata_for_each_link(link, ap, EDGE) {
3972 struct ata_eh_info *ehi = &link->eh_info;
3973 ehi->probe_mask |= ATA_ALL_DEVICES;
3974 ehi->action |= ATA_EH_RESET;
3975 }
3976 } else {
3977 struct ata_device *dev = ata_find_dev(ap, devno);
3978
3979 if (dev) {
3980 struct ata_eh_info *ehi = &dev->link->eh_info;
3981 ehi->probe_mask |= 1 << dev->devno;
3982 ehi->action |= ATA_EH_RESET;
3983 } else
3984 rc = -EINVAL;
3985 }
3986
3987 if (rc == 0) {
3988 ata_port_schedule_eh(ap);
3989 spin_unlock_irqrestore(ap->lock, flags);
3990 ata_port_wait_eh(ap);
3991 } else
3992 spin_unlock_irqrestore(ap->lock, flags);
3993
3994 return rc;
3995 }
3996
3997 /**
3998 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3999 * @work: Pointer to ATA port to perform scsi_rescan_device()
4000 *
4001 * After ATA pass thru (SAT) commands are executed successfully,
4002 * libata need to propagate the changes to SCSI layer.
4003 *
4004 * LOCKING:
4005 * Kernel thread context (may sleep).
4006 */
4007 void ata_scsi_dev_rescan(struct work_struct *work)
4008 {
4009 struct ata_port *ap =
4010 container_of(work, struct ata_port, scsi_rescan_task);
4011 struct ata_link *link;
4012 struct ata_device *dev;
4013 unsigned long flags;
4014
4015 mutex_lock(&ap->scsi_scan_mutex);
4016 spin_lock_irqsave(ap->lock, flags);
4017
4018 ata_for_each_link(link, ap, EDGE) {
4019 ata_for_each_dev(dev, link, ENABLED) {
4020 struct scsi_device *sdev = dev->sdev;
4021
4022 if (!sdev)
4023 continue;
4024 if (scsi_device_get(sdev))
4025 continue;
4026
4027 spin_unlock_irqrestore(ap->lock, flags);
4028 scsi_rescan_device(&(sdev->sdev_gendev));
4029 scsi_device_put(sdev);
4030 spin_lock_irqsave(ap->lock, flags);
4031 }
4032 }
4033
4034 spin_unlock_irqrestore(ap->lock, flags);
4035 mutex_unlock(&ap->scsi_scan_mutex);
4036 }
4037
4038 /**
4039 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
4040 * @host: ATA host container for all SAS ports
4041 * @port_info: Information from low-level host driver
4042 * @shost: SCSI host that the scsi device is attached to
4043 *
4044 * LOCKING:
4045 * PCI/etc. bus probe sem.
4046 *
4047 * RETURNS:
4048 * ata_port pointer on success / NULL on failure.
4049 */
4050
4051 struct ata_port *ata_sas_port_alloc(struct ata_host *host,
4052 struct ata_port_info *port_info,
4053 struct Scsi_Host *shost)
4054 {
4055 struct ata_port *ap;
4056
4057 ap = ata_port_alloc(host);
4058 if (!ap)
4059 return NULL;
4060
4061 ap->port_no = 0;
4062 ap->lock = &host->lock;
4063 ap->pio_mask = port_info->pio_mask;
4064 ap->mwdma_mask = port_info->mwdma_mask;
4065 ap->udma_mask = port_info->udma_mask;
4066 ap->flags |= port_info->flags;
4067 ap->ops = port_info->port_ops;
4068 ap->cbl = ATA_CBL_SATA;
4069
4070 return ap;
4071 }
4072 EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
4073
4074 /**
4075 * ata_sas_port_start - Set port up for dma.
4076 * @ap: Port to initialize
4077 *
4078 * Called just after data structures for each port are
4079 * initialized.
4080 *
4081 * May be used as the port_start() entry in ata_port_operations.
4082 *
4083 * LOCKING:
4084 * Inherited from caller.
4085 */
4086 int ata_sas_port_start(struct ata_port *ap)
4087 {
4088 /*
4089 * the port is marked as frozen at allocation time, but if we don't
4090 * have new eh, we won't thaw it
4091 */
4092 if (!ap->ops->error_handler)
4093 ap->pflags &= ~ATA_PFLAG_FROZEN;
4094 return 0;
4095 }
4096 EXPORT_SYMBOL_GPL(ata_sas_port_start);
4097
4098 /**
4099 * ata_port_stop - Undo ata_sas_port_start()
4100 * @ap: Port to shut down
4101 *
4102 * May be used as the port_stop() entry in ata_port_operations.
4103 *
4104 * LOCKING:
4105 * Inherited from caller.
4106 */
4107
4108 void ata_sas_port_stop(struct ata_port *ap)
4109 {
4110 }
4111 EXPORT_SYMBOL_GPL(ata_sas_port_stop);
4112
4113 /**
4114 * ata_sas_async_probe - simply schedule probing and return
4115 * @ap: Port to probe
4116 *
4117 * For batch scheduling of probe for sas attached ata devices, assumes
4118 * the port has already been through ata_sas_port_init()
4119 */
4120 void ata_sas_async_probe(struct ata_port *ap)
4121 {
4122 __ata_port_probe(ap);
4123 }
4124 EXPORT_SYMBOL_GPL(ata_sas_async_probe);
4125
4126 int ata_sas_sync_probe(struct ata_port *ap)
4127 {
4128 return ata_port_probe(ap);
4129 }
4130 EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
4131
4132
4133 /**
4134 * ata_sas_port_init - Initialize a SATA device
4135 * @ap: SATA port to initialize
4136 *
4137 * LOCKING:
4138 * PCI/etc. bus probe sem.
4139 *
4140 * RETURNS:
4141 * Zero on success, non-zero on error.
4142 */
4143
4144 int ata_sas_port_init(struct ata_port *ap)
4145 {
4146 int rc = ap->ops->port_start(ap);
4147
4148 if (rc)
4149 return rc;
4150 ap->print_id = atomic_inc_return(&ata_print_id);
4151 return 0;
4152 }
4153 EXPORT_SYMBOL_GPL(ata_sas_port_init);
4154
4155 /**
4156 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
4157 * @ap: SATA port to destroy
4158 *
4159 */
4160
4161 void ata_sas_port_destroy(struct ata_port *ap)
4162 {
4163 if (ap->ops->port_stop)
4164 ap->ops->port_stop(ap);
4165 kfree(ap);
4166 }
4167 EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
4168
4169 /**
4170 * ata_sas_slave_configure - Default slave_config routine for libata devices
4171 * @sdev: SCSI device to configure
4172 * @ap: ATA port to which SCSI device is attached
4173 *
4174 * RETURNS:
4175 * Zero.
4176 */
4177
4178 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
4179 {
4180 ata_scsi_sdev_config(sdev);
4181 ata_scsi_dev_config(sdev, ap->link.device);
4182 return 0;
4183 }
4184 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
4185
4186 /**
4187 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
4188 * @cmd: SCSI command to be sent
4189 * @ap: ATA port to which the command is being sent
4190 *
4191 * RETURNS:
4192 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4193 * 0 otherwise.
4194 */
4195
4196 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
4197 {
4198 int rc = 0;
4199
4200 ata_scsi_dump_cdb(ap, cmd);
4201
4202 if (likely(ata_dev_enabled(ap->link.device)))
4203 rc = __ata_scsi_queuecmd(cmd, ap->link.device);
4204 else {
4205 cmd->result = (DID_BAD_TARGET << 16);
4206 cmd->scsi_done(cmd);
4207 }
4208 return rc;
4209 }
4210 EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
Linux with added FPC-III support