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Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / ata / libata-scsi.c
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 <linux/pm_qos.h>
53 #include <asm/unaligned.h>
54
55 #include "libata.h"
56 #include "libata-transport.h"
57
58 #define ATA_SCSI_RBUF_SIZE 4096
59
60 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
61 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
62
63 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
64
65 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
66 const struct scsi_device *scsidev);
67 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
68 const struct scsi_device *scsidev);
69
70 #define RW_RECOVERY_MPAGE 0x1
71 #define RW_RECOVERY_MPAGE_LEN 12
72 #define CACHE_MPAGE 0x8
73 #define CACHE_MPAGE_LEN 20
74 #define CONTROL_MPAGE 0xa
75 #define CONTROL_MPAGE_LEN 12
76 #define ALL_MPAGES 0x3f
77 #define ALL_SUB_MPAGES 0xff
78
79
80 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
81 RW_RECOVERY_MPAGE,
82 RW_RECOVERY_MPAGE_LEN - 2,
83 (1 << 7), /* AWRE */
84 0, /* read retry count */
85 0, 0, 0, 0,
86 0, /* write retry count */
87 0, 0, 0
88 };
89
90 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
91 CACHE_MPAGE,
92 CACHE_MPAGE_LEN - 2,
93 0, /* contains WCE, needs to be 0 for logic */
94 0, 0, 0, 0, 0, 0, 0, 0, 0,
95 0, /* contains DRA, needs to be 0 for logic */
96 0, 0, 0, 0, 0, 0, 0
97 };
98
99 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
100 CONTROL_MPAGE,
101 CONTROL_MPAGE_LEN - 2,
102 2, /* DSENSE=0, GLTSD=1 */
103 0, /* [QAM+QERR may be 1, see 05-359r1] */
104 0, 0, 0, 0, 0xff, 0xff,
105 0, 30 /* extended self test time, see 05-359r1 */
106 };
107
108 static const char *ata_lpm_policy_names[] = {
109 [ATA_LPM_UNKNOWN] = "max_performance",
110 [ATA_LPM_MAX_POWER] = "max_performance",
111 [ATA_LPM_MED_POWER] = "medium_power",
112 [ATA_LPM_MIN_POWER] = "min_power",
113 };
114
115 static ssize_t ata_scsi_lpm_store(struct device *dev,
116 struct device_attribute *attr,
117 const char *buf, size_t count)
118 {
119 struct Scsi_Host *shost = class_to_shost(dev);
120 struct ata_port *ap = ata_shost_to_port(shost);
121 enum ata_lpm_policy policy;
122 unsigned long flags;
123
124 /* UNKNOWN is internal state, iterate from MAX_POWER */
125 for (policy = ATA_LPM_MAX_POWER;
126 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
127 const char *name = ata_lpm_policy_names[policy];
128
129 if (strncmp(name, buf, strlen(name)) == 0)
130 break;
131 }
132 if (policy == ARRAY_SIZE(ata_lpm_policy_names))
133 return -EINVAL;
134
135 spin_lock_irqsave(ap->lock, flags);
136 ap->target_lpm_policy = policy;
137 ata_port_schedule_eh(ap);
138 spin_unlock_irqrestore(ap->lock, flags);
139
140 return count;
141 }
142
143 static ssize_t ata_scsi_lpm_show(struct device *dev,
144 struct device_attribute *attr, char *buf)
145 {
146 struct Scsi_Host *shost = class_to_shost(dev);
147 struct ata_port *ap = ata_shost_to_port(shost);
148
149 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
150 return -EINVAL;
151
152 return snprintf(buf, PAGE_SIZE, "%s\n",
153 ata_lpm_policy_names[ap->target_lpm_policy]);
154 }
155 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
156 ata_scsi_lpm_show, ata_scsi_lpm_store);
157 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
158
159 static ssize_t ata_scsi_park_show(struct device *device,
160 struct device_attribute *attr, char *buf)
161 {
162 struct scsi_device *sdev = to_scsi_device(device);
163 struct ata_port *ap;
164 struct ata_link *link;
165 struct ata_device *dev;
166 unsigned long flags, now;
167 unsigned int uninitialized_var(msecs);
168 int rc = 0;
169
170 ap = ata_shost_to_port(sdev->host);
171
172 spin_lock_irqsave(ap->lock, flags);
173 dev = ata_scsi_find_dev(ap, sdev);
174 if (!dev) {
175 rc = -ENODEV;
176 goto unlock;
177 }
178 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
179 rc = -EOPNOTSUPP;
180 goto unlock;
181 }
182
183 link = dev->link;
184 now = jiffies;
185 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
186 link->eh_context.unloaded_mask & (1 << dev->devno) &&
187 time_after(dev->unpark_deadline, now))
188 msecs = jiffies_to_msecs(dev->unpark_deadline - now);
189 else
190 msecs = 0;
191
192 unlock:
193 spin_unlock_irq(ap->lock);
194
195 return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
196 }
197
198 static ssize_t ata_scsi_park_store(struct device *device,
199 struct device_attribute *attr,
200 const char *buf, size_t len)
201 {
202 struct scsi_device *sdev = to_scsi_device(device);
203 struct ata_port *ap;
204 struct ata_device *dev;
205 long int input;
206 unsigned long flags;
207 int rc;
208
209 rc = strict_strtol(buf, 10, &input);
210 if (rc || input < -2)
211 return -EINVAL;
212 if (input > ATA_TMOUT_MAX_PARK) {
213 rc = -EOVERFLOW;
214 input = ATA_TMOUT_MAX_PARK;
215 }
216
217 ap = ata_shost_to_port(sdev->host);
218
219 spin_lock_irqsave(ap->lock, flags);
220 dev = ata_scsi_find_dev(ap, sdev);
221 if (unlikely(!dev)) {
222 rc = -ENODEV;
223 goto unlock;
224 }
225 if (dev->class != ATA_DEV_ATA) {
226 rc = -EOPNOTSUPP;
227 goto unlock;
228 }
229
230 if (input >= 0) {
231 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
232 rc = -EOPNOTSUPP;
233 goto unlock;
234 }
235
236 dev->unpark_deadline = ata_deadline(jiffies, input);
237 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
238 ata_port_schedule_eh(ap);
239 complete(&ap->park_req_pending);
240 } else {
241 switch (input) {
242 case -1:
243 dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
244 break;
245 case -2:
246 dev->flags |= ATA_DFLAG_NO_UNLOAD;
247 break;
248 }
249 }
250 unlock:
251 spin_unlock_irqrestore(ap->lock, flags);
252
253 return rc ? rc : len;
254 }
255 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
256 ata_scsi_park_show, ata_scsi_park_store);
257 EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
258
259 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
260 {
261 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
262
263 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
264 }
265
266 static ssize_t
267 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
268 const char *buf, size_t count)
269 {
270 struct Scsi_Host *shost = class_to_shost(dev);
271 struct ata_port *ap = ata_shost_to_port(shost);
272 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
273 return ap->ops->em_store(ap, buf, count);
274 return -EINVAL;
275 }
276
277 static ssize_t
278 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
279 char *buf)
280 {
281 struct Scsi_Host *shost = class_to_shost(dev);
282 struct ata_port *ap = ata_shost_to_port(shost);
283
284 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
285 return ap->ops->em_show(ap, buf);
286 return -EINVAL;
287 }
288 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
289 ata_scsi_em_message_show, ata_scsi_em_message_store);
290 EXPORT_SYMBOL_GPL(dev_attr_em_message);
291
292 static ssize_t
293 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
294 char *buf)
295 {
296 struct Scsi_Host *shost = class_to_shost(dev);
297 struct ata_port *ap = ata_shost_to_port(shost);
298
299 return snprintf(buf, 23, "%d\n", ap->em_message_type);
300 }
301 DEVICE_ATTR(em_message_type, S_IRUGO,
302 ata_scsi_em_message_type_show, NULL);
303 EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
304
305 static ssize_t
306 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
307 char *buf)
308 {
309 struct scsi_device *sdev = to_scsi_device(dev);
310 struct ata_port *ap = ata_shost_to_port(sdev->host);
311 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
312
313 if (atadev && ap->ops->sw_activity_show &&
314 (ap->flags & ATA_FLAG_SW_ACTIVITY))
315 return ap->ops->sw_activity_show(atadev, buf);
316 return -EINVAL;
317 }
318
319 static ssize_t
320 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
321 const char *buf, size_t count)
322 {
323 struct scsi_device *sdev = to_scsi_device(dev);
324 struct ata_port *ap = ata_shost_to_port(sdev->host);
325 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
326 enum sw_activity val;
327 int rc;
328
329 if (atadev && ap->ops->sw_activity_store &&
330 (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
331 val = simple_strtoul(buf, NULL, 0);
332 switch (val) {
333 case OFF: case BLINK_ON: case BLINK_OFF:
334 rc = ap->ops->sw_activity_store(atadev, val);
335 if (!rc)
336 return count;
337 else
338 return rc;
339 }
340 }
341 return -EINVAL;
342 }
343 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
344 ata_scsi_activity_store);
345 EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
346
347 struct device_attribute *ata_common_sdev_attrs[] = {
348 &dev_attr_unload_heads,
349 NULL
350 };
351 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
352
353 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd)
354 {
355 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
356 /* "Invalid field in cbd" */
357 cmd->scsi_done(cmd);
358 }
359
360 /**
361 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
362 * @sdev: SCSI device for which BIOS geometry is to be determined
363 * @bdev: block device associated with @sdev
364 * @capacity: capacity of SCSI device
365 * @geom: location to which geometry will be output
366 *
367 * Generic bios head/sector/cylinder calculator
368 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
369 * mapping. Some situations may arise where the disk is not
370 * bootable if this is not used.
371 *
372 * LOCKING:
373 * Defined by the SCSI layer. We don't really care.
374 *
375 * RETURNS:
376 * Zero.
377 */
378 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
379 sector_t capacity, int geom[])
380 {
381 geom[0] = 255;
382 geom[1] = 63;
383 sector_div(capacity, 255*63);
384 geom[2] = capacity;
385
386 return 0;
387 }
388
389 /**
390 * ata_scsi_unlock_native_capacity - unlock native capacity
391 * @sdev: SCSI device to adjust device capacity for
392 *
393 * This function is called if a partition on @sdev extends beyond
394 * the end of the device. It requests EH to unlock HPA.
395 *
396 * LOCKING:
397 * Defined by the SCSI layer. Might sleep.
398 */
399 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
400 {
401 struct ata_port *ap = ata_shost_to_port(sdev->host);
402 struct ata_device *dev;
403 unsigned long flags;
404
405 spin_lock_irqsave(ap->lock, flags);
406
407 dev = ata_scsi_find_dev(ap, sdev);
408 if (dev && dev->n_sectors < dev->n_native_sectors) {
409 dev->flags |= ATA_DFLAG_UNLOCK_HPA;
410 dev->link->eh_info.action |= ATA_EH_RESET;
411 ata_port_schedule_eh(ap);
412 }
413
414 spin_unlock_irqrestore(ap->lock, flags);
415 ata_port_wait_eh(ap);
416 }
417
418 /**
419 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
420 * @ap: target port
421 * @sdev: SCSI device to get identify data for
422 * @arg: User buffer area for identify data
423 *
424 * LOCKING:
425 * Defined by the SCSI layer. We don't really care.
426 *
427 * RETURNS:
428 * Zero on success, negative errno on error.
429 */
430 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
431 void __user *arg)
432 {
433 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
434 u16 __user *dst = arg;
435 char buf[40];
436
437 if (!dev)
438 return -ENOMSG;
439
440 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
441 return -EFAULT;
442
443 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
444 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
445 return -EFAULT;
446
447 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
448 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
449 return -EFAULT;
450
451 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
452 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
453 return -EFAULT;
454
455 return 0;
456 }
457
458 /**
459 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
460 * @scsidev: Device to which we are issuing command
461 * @arg: User provided data for issuing command
462 *
463 * LOCKING:
464 * Defined by the SCSI layer. We don't really care.
465 *
466 * RETURNS:
467 * Zero on success, negative errno on error.
468 */
469 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
470 {
471 int rc = 0;
472 u8 scsi_cmd[MAX_COMMAND_SIZE];
473 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
474 int argsize = 0;
475 enum dma_data_direction data_dir;
476 int cmd_result;
477
478 if (arg == NULL)
479 return -EINVAL;
480
481 if (copy_from_user(args, arg, sizeof(args)))
482 return -EFAULT;
483
484 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
485 if (!sensebuf)
486 return -ENOMEM;
487
488 memset(scsi_cmd, 0, sizeof(scsi_cmd));
489
490 if (args[3]) {
491 argsize = ATA_SECT_SIZE * args[3];
492 argbuf = kmalloc(argsize, GFP_KERNEL);
493 if (argbuf == NULL) {
494 rc = -ENOMEM;
495 goto error;
496 }
497
498 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
499 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
500 block count in sector count field */
501 data_dir = DMA_FROM_DEVICE;
502 } else {
503 scsi_cmd[1] = (3 << 1); /* Non-data */
504 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
505 data_dir = DMA_NONE;
506 }
507
508 scsi_cmd[0] = ATA_16;
509
510 scsi_cmd[4] = args[2];
511 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
512 scsi_cmd[6] = args[3];
513 scsi_cmd[8] = args[1];
514 scsi_cmd[10] = 0x4f;
515 scsi_cmd[12] = 0xc2;
516 } else {
517 scsi_cmd[6] = args[1];
518 }
519 scsi_cmd[14] = args[0];
520
521 /* Good values for timeout and retries? Values below
522 from scsi_ioctl_send_command() for default case... */
523 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
524 sensebuf, (10*HZ), 5, 0, NULL);
525
526 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
527 u8 *desc = sensebuf + 8;
528 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
529
530 /* If we set cc then ATA pass-through will cause a
531 * check condition even if no error. Filter that. */
532 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
533 struct scsi_sense_hdr sshdr;
534 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
535 &sshdr);
536 if (sshdr.sense_key == RECOVERED_ERROR &&
537 sshdr.asc == 0 && sshdr.ascq == 0x1d)
538 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
539 }
540
541 /* Send userspace a few ATA registers (same as drivers/ide) */
542 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
543 desc[0] == 0x09) { /* code is "ATA Descriptor" */
544 args[0] = desc[13]; /* status */
545 args[1] = desc[3]; /* error */
546 args[2] = desc[5]; /* sector count (0:7) */
547 if (copy_to_user(arg, args, sizeof(args)))
548 rc = -EFAULT;
549 }
550 }
551
552
553 if (cmd_result) {
554 rc = -EIO;
555 goto error;
556 }
557
558 if ((argbuf)
559 && copy_to_user(arg + sizeof(args), argbuf, argsize))
560 rc = -EFAULT;
561 error:
562 kfree(sensebuf);
563 kfree(argbuf);
564 return rc;
565 }
566
567 /**
568 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
569 * @scsidev: Device to which we are issuing command
570 * @arg: User provided data for issuing command
571 *
572 * LOCKING:
573 * Defined by the SCSI layer. We don't really care.
574 *
575 * RETURNS:
576 * Zero on success, negative errno on error.
577 */
578 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
579 {
580 int rc = 0;
581 u8 scsi_cmd[MAX_COMMAND_SIZE];
582 u8 args[7], *sensebuf = NULL;
583 int cmd_result;
584
585 if (arg == NULL)
586 return -EINVAL;
587
588 if (copy_from_user(args, arg, sizeof(args)))
589 return -EFAULT;
590
591 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
592 if (!sensebuf)
593 return -ENOMEM;
594
595 memset(scsi_cmd, 0, sizeof(scsi_cmd));
596 scsi_cmd[0] = ATA_16;
597 scsi_cmd[1] = (3 << 1); /* Non-data */
598 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
599 scsi_cmd[4] = args[1];
600 scsi_cmd[6] = args[2];
601 scsi_cmd[8] = args[3];
602 scsi_cmd[10] = args[4];
603 scsi_cmd[12] = args[5];
604 scsi_cmd[13] = args[6] & 0x4f;
605 scsi_cmd[14] = args[0];
606
607 /* Good values for timeout and retries? Values below
608 from scsi_ioctl_send_command() for default case... */
609 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
610 sensebuf, (10*HZ), 5, 0, NULL);
611
612 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
613 u8 *desc = sensebuf + 8;
614 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
615
616 /* If we set cc then ATA pass-through will cause a
617 * check condition even if no error. Filter that. */
618 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
619 struct scsi_sense_hdr sshdr;
620 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
621 &sshdr);
622 if (sshdr.sense_key == RECOVERED_ERROR &&
623 sshdr.asc == 0 && sshdr.ascq == 0x1d)
624 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
625 }
626
627 /* Send userspace ATA registers */
628 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
629 desc[0] == 0x09) {/* code is "ATA Descriptor" */
630 args[0] = desc[13]; /* status */
631 args[1] = desc[3]; /* error */
632 args[2] = desc[5]; /* sector count (0:7) */
633 args[3] = desc[7]; /* lbal */
634 args[4] = desc[9]; /* lbam */
635 args[5] = desc[11]; /* lbah */
636 args[6] = desc[12]; /* select */
637 if (copy_to_user(arg, args, sizeof(args)))
638 rc = -EFAULT;
639 }
640 }
641
642 if (cmd_result) {
643 rc = -EIO;
644 goto error;
645 }
646
647 error:
648 kfree(sensebuf);
649 return rc;
650 }
651
652 static int ata_ioc32(struct ata_port *ap)
653 {
654 if (ap->flags & ATA_FLAG_PIO_DMA)
655 return 1;
656 if (ap->pflags & ATA_PFLAG_PIO32)
657 return 1;
658 return 0;
659 }
660
661 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
662 int cmd, void __user *arg)
663 {
664 int val = -EINVAL, rc = -EINVAL;
665 unsigned long flags;
666
667 switch (cmd) {
668 case ATA_IOC_GET_IO32:
669 spin_lock_irqsave(ap->lock, flags);
670 val = ata_ioc32(ap);
671 spin_unlock_irqrestore(ap->lock, flags);
672 if (copy_to_user(arg, &val, 1))
673 return -EFAULT;
674 return 0;
675
676 case ATA_IOC_SET_IO32:
677 val = (unsigned long) arg;
678 rc = 0;
679 spin_lock_irqsave(ap->lock, flags);
680 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
681 if (val)
682 ap->pflags |= ATA_PFLAG_PIO32;
683 else
684 ap->pflags &= ~ATA_PFLAG_PIO32;
685 } else {
686 if (val != ata_ioc32(ap))
687 rc = -EINVAL;
688 }
689 spin_unlock_irqrestore(ap->lock, flags);
690 return rc;
691
692 case HDIO_GET_IDENTITY:
693 return ata_get_identity(ap, scsidev, arg);
694
695 case HDIO_DRIVE_CMD:
696 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
697 return -EACCES;
698 return ata_cmd_ioctl(scsidev, arg);
699
700 case HDIO_DRIVE_TASK:
701 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
702 return -EACCES;
703 return ata_task_ioctl(scsidev, arg);
704
705 default:
706 rc = -ENOTTY;
707 break;
708 }
709
710 return rc;
711 }
712 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
713
714 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
715 {
716 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
717 scsidev, cmd, arg);
718 }
719 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
720
721 /**
722 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
723 * @dev: ATA device to which the new command is attached
724 * @cmd: SCSI command that originated this ATA command
725 *
726 * Obtain a reference to an unused ata_queued_cmd structure,
727 * which is the basic libata structure representing a single
728 * ATA command sent to the hardware.
729 *
730 * If a command was available, fill in the SCSI-specific
731 * portions of the structure with information on the
732 * current command.
733 *
734 * LOCKING:
735 * spin_lock_irqsave(host lock)
736 *
737 * RETURNS:
738 * Command allocated, or %NULL if none available.
739 */
740 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
741 struct scsi_cmnd *cmd)
742 {
743 struct ata_queued_cmd *qc;
744
745 qc = ata_qc_new_init(dev);
746 if (qc) {
747 qc->scsicmd = cmd;
748 qc->scsidone = cmd->scsi_done;
749
750 qc->sg = scsi_sglist(cmd);
751 qc->n_elem = scsi_sg_count(cmd);
752 } else {
753 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
754 cmd->scsi_done(cmd);
755 }
756
757 return qc;
758 }
759
760 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
761 {
762 struct scsi_cmnd *scmd = qc->scsicmd;
763
764 qc->extrabytes = scmd->request->extra_len;
765 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
766 }
767
768 /**
769 * ata_dump_status - user friendly display of error info
770 * @id: id of the port in question
771 * @tf: ptr to filled out taskfile
772 *
773 * Decode and dump the ATA error/status registers for the user so
774 * that they have some idea what really happened at the non
775 * make-believe layer.
776 *
777 * LOCKING:
778 * inherited from caller
779 */
780 static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
781 {
782 u8 stat = tf->command, err = tf->feature;
783
784 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
785 if (stat & ATA_BUSY) {
786 printk("Busy }\n"); /* Data is not valid in this case */
787 } else {
788 if (stat & 0x40) printk("DriveReady ");
789 if (stat & 0x20) printk("DeviceFault ");
790 if (stat & 0x10) printk("SeekComplete ");
791 if (stat & 0x08) printk("DataRequest ");
792 if (stat & 0x04) printk("CorrectedError ");
793 if (stat & 0x02) printk("Index ");
794 if (stat & 0x01) printk("Error ");
795 printk("}\n");
796
797 if (err) {
798 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
799 if (err & 0x04) printk("DriveStatusError ");
800 if (err & 0x80) {
801 if (err & 0x04) printk("BadCRC ");
802 else printk("Sector ");
803 }
804 if (err & 0x40) printk("UncorrectableError ");
805 if (err & 0x10) printk("SectorIdNotFound ");
806 if (err & 0x02) printk("TrackZeroNotFound ");
807 if (err & 0x01) printk("AddrMarkNotFound ");
808 printk("}\n");
809 }
810 }
811 }
812
813 /**
814 * ata_to_sense_error - convert ATA error to SCSI error
815 * @id: ATA device number
816 * @drv_stat: value contained in ATA status register
817 * @drv_err: value contained in ATA error register
818 * @sk: the sense key we'll fill out
819 * @asc: the additional sense code we'll fill out
820 * @ascq: the additional sense code qualifier we'll fill out
821 * @verbose: be verbose
822 *
823 * Converts an ATA error into a SCSI error. Fill out pointers to
824 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
825 * format sense blocks.
826 *
827 * LOCKING:
828 * spin_lock_irqsave(host lock)
829 */
830 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
831 u8 *asc, u8 *ascq, int verbose)
832 {
833 int i;
834
835 /* Based on the 3ware driver translation table */
836 static const unsigned char sense_table[][4] = {
837 /* BBD|ECC|ID|MAR */
838 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
839 /* BBD|ECC|ID */
840 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
841 /* ECC|MC|MARK */
842 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
843 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
844 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
845 /* MC|ID|ABRT|TRK0|MARK */
846 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
847 /* MCR|MARK */
848 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
849 /* Bad address mark */
850 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
851 /* TRK0 */
852 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
853 /* Abort & !ICRC */
854 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
855 /* Media change request */
856 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
857 /* SRV */
858 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
859 /* Media change */
860 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
861 /* ECC */
862 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
863 /* BBD - block marked bad */
864 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
865 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
866 };
867 static const unsigned char stat_table[][4] = {
868 /* Must be first because BUSY means no other bits valid */
869 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
870 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
871 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
872 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
873 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
874 };
875
876 /*
877 * Is this an error we can process/parse
878 */
879 if (drv_stat & ATA_BUSY) {
880 drv_err = 0; /* Ignore the err bits, they're invalid */
881 }
882
883 if (drv_err) {
884 /* Look for drv_err */
885 for (i = 0; sense_table[i][0] != 0xFF; i++) {
886 /* Look for best matches first */
887 if ((sense_table[i][0] & drv_err) ==
888 sense_table[i][0]) {
889 *sk = sense_table[i][1];
890 *asc = sense_table[i][2];
891 *ascq = sense_table[i][3];
892 goto translate_done;
893 }
894 }
895 /* No immediate match */
896 if (verbose)
897 printk(KERN_WARNING "ata%u: no sense translation for "
898 "error 0x%02x\n", id, drv_err);
899 }
900
901 /* Fall back to interpreting status bits */
902 for (i = 0; stat_table[i][0] != 0xFF; i++) {
903 if (stat_table[i][0] & drv_stat) {
904 *sk = stat_table[i][1];
905 *asc = stat_table[i][2];
906 *ascq = stat_table[i][3];
907 goto translate_done;
908 }
909 }
910 /* No error? Undecoded? */
911 if (verbose)
912 printk(KERN_WARNING "ata%u: no sense translation for "
913 "status: 0x%02x\n", id, drv_stat);
914
915 /* We need a sensible error return here, which is tricky, and one
916 that won't cause people to do things like return a disk wrongly */
917 *sk = ABORTED_COMMAND;
918 *asc = 0x00;
919 *ascq = 0x00;
920
921 translate_done:
922 if (verbose)
923 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
924 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
925 id, drv_stat, drv_err, *sk, *asc, *ascq);
926 return;
927 }
928
929 /*
930 * ata_gen_passthru_sense - Generate check condition sense block.
931 * @qc: Command that completed.
932 *
933 * This function is specific to the ATA descriptor format sense
934 * block specified for the ATA pass through commands. Regardless
935 * of whether the command errored or not, return a sense
936 * block. Copy all controller registers into the sense
937 * block. If there was no error, we get the request from an ATA
938 * passthrough command, so we use the following sense data:
939 * sk = RECOVERED ERROR
940 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
941 *
942 *
943 * LOCKING:
944 * None.
945 */
946 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
947 {
948 struct scsi_cmnd *cmd = qc->scsicmd;
949 struct ata_taskfile *tf = &qc->result_tf;
950 unsigned char *sb = cmd->sense_buffer;
951 unsigned char *desc = sb + 8;
952 int verbose = qc->ap->ops->error_handler == NULL;
953
954 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
955
956 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
957
958 /*
959 * Use ata_to_sense_error() to map status register bits
960 * onto sense key, asc & ascq.
961 */
962 if (qc->err_mask ||
963 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
964 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
965 &sb[1], &sb[2], &sb[3], verbose);
966 sb[1] &= 0x0f;
967 } else {
968 sb[1] = RECOVERED_ERROR;
969 sb[2] = 0;
970 sb[3] = 0x1D;
971 }
972
973 /*
974 * Sense data is current and format is descriptor.
975 */
976 sb[0] = 0x72;
977
978 desc[0] = 0x09;
979
980 /* set length of additional sense data */
981 sb[7] = 14;
982 desc[1] = 12;
983
984 /*
985 * Copy registers into sense buffer.
986 */
987 desc[2] = 0x00;
988 desc[3] = tf->feature; /* == error reg */
989 desc[5] = tf->nsect;
990 desc[7] = tf->lbal;
991 desc[9] = tf->lbam;
992 desc[11] = tf->lbah;
993 desc[12] = tf->device;
994 desc[13] = tf->command; /* == status reg */
995
996 /*
997 * Fill in Extend bit, and the high order bytes
998 * if applicable.
999 */
1000 if (tf->flags & ATA_TFLAG_LBA48) {
1001 desc[2] |= 0x01;
1002 desc[4] = tf->hob_nsect;
1003 desc[6] = tf->hob_lbal;
1004 desc[8] = tf->hob_lbam;
1005 desc[10] = tf->hob_lbah;
1006 }
1007 }
1008
1009 /**
1010 * ata_gen_ata_sense - generate a SCSI fixed sense block
1011 * @qc: Command that we are erroring out
1012 *
1013 * Generate sense block for a failed ATA command @qc. Descriptor
1014 * format is used to accommodate LBA48 block address.
1015 *
1016 * LOCKING:
1017 * None.
1018 */
1019 static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
1020 {
1021 struct ata_device *dev = qc->dev;
1022 struct scsi_cmnd *cmd = qc->scsicmd;
1023 struct ata_taskfile *tf = &qc->result_tf;
1024 unsigned char *sb = cmd->sense_buffer;
1025 unsigned char *desc = sb + 8;
1026 int verbose = qc->ap->ops->error_handler == NULL;
1027 u64 block;
1028
1029 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1030
1031 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
1032
1033 /* sense data is current and format is descriptor */
1034 sb[0] = 0x72;
1035
1036 /* Use ata_to_sense_error() to map status register bits
1037 * onto sense key, asc & ascq.
1038 */
1039 if (qc->err_mask ||
1040 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
1041 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
1042 &sb[1], &sb[2], &sb[3], verbose);
1043 sb[1] &= 0x0f;
1044 }
1045
1046 block = ata_tf_read_block(&qc->result_tf, dev);
1047
1048 /* information sense data descriptor */
1049 sb[7] = 12;
1050 desc[0] = 0x00;
1051 desc[1] = 10;
1052
1053 desc[2] |= 0x80; /* valid */
1054 desc[6] = block >> 40;
1055 desc[7] = block >> 32;
1056 desc[8] = block >> 24;
1057 desc[9] = block >> 16;
1058 desc[10] = block >> 8;
1059 desc[11] = block;
1060 }
1061
1062 static void ata_scsi_sdev_config(struct scsi_device *sdev)
1063 {
1064 sdev->use_10_for_rw = 1;
1065 sdev->use_10_for_ms = 1;
1066 sdev->no_report_opcodes = 1;
1067 sdev->no_write_same = 1;
1068
1069 /* Schedule policy is determined by ->qc_defer() callback and
1070 * it needs to see every deferred qc. Set dev_blocked to 1 to
1071 * prevent SCSI midlayer from automatically deferring
1072 * requests.
1073 */
1074 sdev->max_device_blocked = 1;
1075 }
1076
1077 /**
1078 * atapi_drain_needed - Check whether data transfer may overflow
1079 * @rq: request to be checked
1080 *
1081 * ATAPI commands which transfer variable length data to host
1082 * might overflow due to application error or hardare bug. This
1083 * function checks whether overflow should be drained and ignored
1084 * for @request.
1085 *
1086 * LOCKING:
1087 * None.
1088 *
1089 * RETURNS:
1090 * 1 if ; otherwise, 0.
1091 */
1092 static int atapi_drain_needed(struct request *rq)
1093 {
1094 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
1095 return 0;
1096
1097 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
1098 return 0;
1099
1100 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1101 }
1102
1103 static int ata_scsi_dev_config(struct scsi_device *sdev,
1104 struct ata_device *dev)
1105 {
1106 struct request_queue *q = sdev->request_queue;
1107
1108 if (!ata_id_has_unload(dev->id))
1109 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1110
1111 /* configure max sectors */
1112 blk_queue_max_hw_sectors(q, dev->max_sectors);
1113
1114 if (dev->class == ATA_DEV_ATAPI) {
1115 void *buf;
1116
1117 sdev->sector_size = ATA_SECT_SIZE;
1118
1119 /* set DMA padding */
1120 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
1121
1122 /* configure draining */
1123 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1124 if (!buf) {
1125 ata_dev_err(dev, "drain buffer allocation failed\n");
1126 return -ENOMEM;
1127 }
1128
1129 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1130 } else {
1131 sdev->sector_size = ata_id_logical_sector_size(dev->id);
1132 sdev->manage_start_stop = 1;
1133 }
1134
1135 /*
1136 * ata_pio_sectors() expects buffer for each sector to not cross
1137 * page boundary. Enforce it by requiring buffers to be sector
1138 * aligned, which works iff sector_size is not larger than
1139 * PAGE_SIZE. ATAPI devices also need the alignment as
1140 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1141 */
1142 if (sdev->sector_size > PAGE_SIZE)
1143 ata_dev_warn(dev,
1144 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1145 sdev->sector_size);
1146
1147 blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
1148
1149 if (dev->flags & ATA_DFLAG_AN)
1150 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1151
1152 if (dev->flags & ATA_DFLAG_NCQ) {
1153 int depth;
1154
1155 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1156 depth = min(ATA_MAX_QUEUE - 1, depth);
1157 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
1158 }
1159
1160 blk_queue_flush_queueable(q, false);
1161
1162 dev->sdev = sdev;
1163 return 0;
1164 }
1165
1166 /**
1167 * ata_scsi_slave_config - Set SCSI device attributes
1168 * @sdev: SCSI device to examine
1169 *
1170 * This is called before we actually start reading
1171 * and writing to the device, to configure certain
1172 * SCSI mid-layer behaviors.
1173 *
1174 * LOCKING:
1175 * Defined by SCSI layer. We don't really care.
1176 */
1177
1178 int ata_scsi_slave_config(struct scsi_device *sdev)
1179 {
1180 struct ata_port *ap = ata_shost_to_port(sdev->host);
1181 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1182 int rc = 0;
1183
1184 ata_scsi_sdev_config(sdev);
1185
1186 if (dev)
1187 rc = ata_scsi_dev_config(sdev, dev);
1188
1189 return rc;
1190 }
1191
1192 /**
1193 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1194 * @sdev: SCSI device to be destroyed
1195 *
1196 * @sdev is about to be destroyed for hot/warm unplugging. If
1197 * this unplugging was initiated by libata as indicated by NULL
1198 * dev->sdev, this function doesn't have to do anything.
1199 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1200 * Clear dev->sdev, schedule the device for ATA detach and invoke
1201 * EH.
1202 *
1203 * LOCKING:
1204 * Defined by SCSI layer. We don't really care.
1205 */
1206 void ata_scsi_slave_destroy(struct scsi_device *sdev)
1207 {
1208 struct ata_port *ap = ata_shost_to_port(sdev->host);
1209 struct request_queue *q = sdev->request_queue;
1210 unsigned long flags;
1211 struct ata_device *dev;
1212
1213 if (!ap->ops->error_handler)
1214 return;
1215
1216 spin_lock_irqsave(ap->lock, flags);
1217 dev = __ata_scsi_find_dev(ap, sdev);
1218 if (dev && dev->sdev) {
1219 /* SCSI device already in CANCEL state, no need to offline it */
1220 dev->sdev = NULL;
1221 dev->flags |= ATA_DFLAG_DETACH;
1222 ata_port_schedule_eh(ap);
1223 }
1224 spin_unlock_irqrestore(ap->lock, flags);
1225
1226 kfree(q->dma_drain_buffer);
1227 q->dma_drain_buffer = NULL;
1228 q->dma_drain_size = 0;
1229 }
1230
1231 /**
1232 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
1233 * @ap: ATA port to which the device change the queue depth
1234 * @sdev: SCSI device to configure queue depth for
1235 * @queue_depth: new queue depth
1236 * @reason: calling context
1237 *
1238 * libsas and libata have different approaches for associating a sdev to
1239 * its ata_port.
1240 *
1241 */
1242 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
1243 int queue_depth, int reason)
1244 {
1245 struct ata_device *dev;
1246 unsigned long flags;
1247
1248 if (reason != SCSI_QDEPTH_DEFAULT)
1249 return -EOPNOTSUPP;
1250
1251 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1252 return sdev->queue_depth;
1253
1254 dev = ata_scsi_find_dev(ap, sdev);
1255 if (!dev || !ata_dev_enabled(dev))
1256 return sdev->queue_depth;
1257
1258 /* NCQ enabled? */
1259 spin_lock_irqsave(ap->lock, flags);
1260 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1261 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1262 dev->flags |= ATA_DFLAG_NCQ_OFF;
1263 queue_depth = 1;
1264 }
1265 spin_unlock_irqrestore(ap->lock, flags);
1266
1267 /* limit and apply queue depth */
1268 queue_depth = min(queue_depth, sdev->host->can_queue);
1269 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1270 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1271
1272 if (sdev->queue_depth == queue_depth)
1273 return -EINVAL;
1274
1275 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
1276 return queue_depth;
1277 }
1278
1279 /**
1280 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1281 * @sdev: SCSI device to configure queue depth for
1282 * @queue_depth: new queue depth
1283 * @reason: calling context
1284 *
1285 * This is libata standard hostt->change_queue_depth callback.
1286 * SCSI will call into this callback when user tries to set queue
1287 * depth via sysfs.
1288 *
1289 * LOCKING:
1290 * SCSI layer (we don't care)
1291 *
1292 * RETURNS:
1293 * Newly configured queue depth.
1294 */
1295 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth,
1296 int reason)
1297 {
1298 struct ata_port *ap = ata_shost_to_port(sdev->host);
1299
1300 return __ata_change_queue_depth(ap, sdev, queue_depth, reason);
1301 }
1302
1303 /**
1304 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1305 * @qc: Storage for translated ATA taskfile
1306 *
1307 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1308 * (to start). Perhaps these commands should be preceded by
1309 * CHECK POWER MODE to see what power mode the device is already in.
1310 * [See SAT revision 5 at www.t10.org]
1311 *
1312 * LOCKING:
1313 * spin_lock_irqsave(host lock)
1314 *
1315 * RETURNS:
1316 * Zero on success, non-zero on error.
1317 */
1318 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1319 {
1320 struct scsi_cmnd *scmd = qc->scsicmd;
1321 struct ata_taskfile *tf = &qc->tf;
1322 const u8 *cdb = scmd->cmnd;
1323
1324 if (scmd->cmd_len < 5)
1325 goto invalid_fld;
1326
1327 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1328 tf->protocol = ATA_PROT_NODATA;
1329 if (cdb[1] & 0x1) {
1330 ; /* ignore IMMED bit, violates sat-r05 */
1331 }
1332 if (cdb[4] & 0x2)
1333 goto invalid_fld; /* LOEJ bit set not supported */
1334 if (((cdb[4] >> 4) & 0xf) != 0)
1335 goto invalid_fld; /* power conditions not supported */
1336
1337 if (cdb[4] & 0x1) {
1338 tf->nsect = 1; /* 1 sector, lba=0 */
1339
1340 if (qc->dev->flags & ATA_DFLAG_LBA) {
1341 tf->flags |= ATA_TFLAG_LBA;
1342
1343 tf->lbah = 0x0;
1344 tf->lbam = 0x0;
1345 tf->lbal = 0x0;
1346 tf->device |= ATA_LBA;
1347 } else {
1348 /* CHS */
1349 tf->lbal = 0x1; /* sect */
1350 tf->lbam = 0x0; /* cyl low */
1351 tf->lbah = 0x0; /* cyl high */
1352 }
1353
1354 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
1355 } else {
1356 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1357 * or S5) causing some drives to spin up and down again.
1358 */
1359 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1360 system_state == SYSTEM_POWER_OFF)
1361 goto skip;
1362
1363 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1364 system_entering_hibernation())
1365 goto skip;
1366
1367 /* Issue ATA STANDBY IMMEDIATE command */
1368 tf->command = ATA_CMD_STANDBYNOW1;
1369 }
1370
1371 /*
1372 * Standby and Idle condition timers could be implemented but that
1373 * would require libata to implement the Power condition mode page
1374 * and allow the user to change it. Changing mode pages requires
1375 * MODE SELECT to be implemented.
1376 */
1377
1378 return 0;
1379
1380 invalid_fld:
1381 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1382 /* "Invalid field in cbd" */
1383 return 1;
1384 skip:
1385 scmd->result = SAM_STAT_GOOD;
1386 return 1;
1387 }
1388
1389
1390 /**
1391 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1392 * @qc: Storage for translated ATA taskfile
1393 *
1394 * Sets up an ATA taskfile to issue FLUSH CACHE or
1395 * FLUSH CACHE EXT.
1396 *
1397 * LOCKING:
1398 * spin_lock_irqsave(host lock)
1399 *
1400 * RETURNS:
1401 * Zero on success, non-zero on error.
1402 */
1403 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1404 {
1405 struct ata_taskfile *tf = &qc->tf;
1406
1407 tf->flags |= ATA_TFLAG_DEVICE;
1408 tf->protocol = ATA_PROT_NODATA;
1409
1410 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1411 tf->command = ATA_CMD_FLUSH_EXT;
1412 else
1413 tf->command = ATA_CMD_FLUSH;
1414
1415 /* flush is critical for IO integrity, consider it an IO command */
1416 qc->flags |= ATA_QCFLAG_IO;
1417
1418 return 0;
1419 }
1420
1421 /**
1422 * scsi_6_lba_len - Get LBA and transfer length
1423 * @cdb: SCSI command to translate
1424 *
1425 * Calculate LBA and transfer length for 6-byte commands.
1426 *
1427 * RETURNS:
1428 * @plba: the LBA
1429 * @plen: the transfer length
1430 */
1431 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1432 {
1433 u64 lba = 0;
1434 u32 len;
1435
1436 VPRINTK("six-byte command\n");
1437
1438 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1439 lba |= ((u64)cdb[2]) << 8;
1440 lba |= ((u64)cdb[3]);
1441
1442 len = cdb[4];
1443
1444 *plba = lba;
1445 *plen = len;
1446 }
1447
1448 /**
1449 * scsi_10_lba_len - Get LBA and transfer length
1450 * @cdb: SCSI command to translate
1451 *
1452 * Calculate LBA and transfer length for 10-byte commands.
1453 *
1454 * RETURNS:
1455 * @plba: the LBA
1456 * @plen: the transfer length
1457 */
1458 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1459 {
1460 u64 lba = 0;
1461 u32 len = 0;
1462
1463 VPRINTK("ten-byte command\n");
1464
1465 lba |= ((u64)cdb[2]) << 24;
1466 lba |= ((u64)cdb[3]) << 16;
1467 lba |= ((u64)cdb[4]) << 8;
1468 lba |= ((u64)cdb[5]);
1469
1470 len |= ((u32)cdb[7]) << 8;
1471 len |= ((u32)cdb[8]);
1472
1473 *plba = lba;
1474 *plen = len;
1475 }
1476
1477 /**
1478 * scsi_16_lba_len - Get LBA and transfer length
1479 * @cdb: SCSI command to translate
1480 *
1481 * Calculate LBA and transfer length for 16-byte commands.
1482 *
1483 * RETURNS:
1484 * @plba: the LBA
1485 * @plen: the transfer length
1486 */
1487 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1488 {
1489 u64 lba = 0;
1490 u32 len = 0;
1491
1492 VPRINTK("sixteen-byte command\n");
1493
1494 lba |= ((u64)cdb[2]) << 56;
1495 lba |= ((u64)cdb[3]) << 48;
1496 lba |= ((u64)cdb[4]) << 40;
1497 lba |= ((u64)cdb[5]) << 32;
1498 lba |= ((u64)cdb[6]) << 24;
1499 lba |= ((u64)cdb[7]) << 16;
1500 lba |= ((u64)cdb[8]) << 8;
1501 lba |= ((u64)cdb[9]);
1502
1503 len |= ((u32)cdb[10]) << 24;
1504 len |= ((u32)cdb[11]) << 16;
1505 len |= ((u32)cdb[12]) << 8;
1506 len |= ((u32)cdb[13]);
1507
1508 *plba = lba;
1509 *plen = len;
1510 }
1511
1512 /**
1513 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1514 * @qc: Storage for translated ATA taskfile
1515 *
1516 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1517 *
1518 * LOCKING:
1519 * spin_lock_irqsave(host lock)
1520 *
1521 * RETURNS:
1522 * Zero on success, non-zero on error.
1523 */
1524 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1525 {
1526 struct scsi_cmnd *scmd = qc->scsicmd;
1527 struct ata_taskfile *tf = &qc->tf;
1528 struct ata_device *dev = qc->dev;
1529 u64 dev_sectors = qc->dev->n_sectors;
1530 const u8 *cdb = scmd->cmnd;
1531 u64 block;
1532 u32 n_block;
1533
1534 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1535 tf->protocol = ATA_PROT_NODATA;
1536
1537 if (cdb[0] == VERIFY) {
1538 if (scmd->cmd_len < 10)
1539 goto invalid_fld;
1540 scsi_10_lba_len(cdb, &block, &n_block);
1541 } else if (cdb[0] == VERIFY_16) {
1542 if (scmd->cmd_len < 16)
1543 goto invalid_fld;
1544 scsi_16_lba_len(cdb, &block, &n_block);
1545 } else
1546 goto invalid_fld;
1547
1548 if (!n_block)
1549 goto nothing_to_do;
1550 if (block >= dev_sectors)
1551 goto out_of_range;
1552 if ((block + n_block) > dev_sectors)
1553 goto out_of_range;
1554
1555 if (dev->flags & ATA_DFLAG_LBA) {
1556 tf->flags |= ATA_TFLAG_LBA;
1557
1558 if (lba_28_ok(block, n_block)) {
1559 /* use LBA28 */
1560 tf->command = ATA_CMD_VERIFY;
1561 tf->device |= (block >> 24) & 0xf;
1562 } else if (lba_48_ok(block, n_block)) {
1563 if (!(dev->flags & ATA_DFLAG_LBA48))
1564 goto out_of_range;
1565
1566 /* use LBA48 */
1567 tf->flags |= ATA_TFLAG_LBA48;
1568 tf->command = ATA_CMD_VERIFY_EXT;
1569
1570 tf->hob_nsect = (n_block >> 8) & 0xff;
1571
1572 tf->hob_lbah = (block >> 40) & 0xff;
1573 tf->hob_lbam = (block >> 32) & 0xff;
1574 tf->hob_lbal = (block >> 24) & 0xff;
1575 } else
1576 /* request too large even for LBA48 */
1577 goto out_of_range;
1578
1579 tf->nsect = n_block & 0xff;
1580
1581 tf->lbah = (block >> 16) & 0xff;
1582 tf->lbam = (block >> 8) & 0xff;
1583 tf->lbal = block & 0xff;
1584
1585 tf->device |= ATA_LBA;
1586 } else {
1587 /* CHS */
1588 u32 sect, head, cyl, track;
1589
1590 if (!lba_28_ok(block, n_block))
1591 goto out_of_range;
1592
1593 /* Convert LBA to CHS */
1594 track = (u32)block / dev->sectors;
1595 cyl = track / dev->heads;
1596 head = track % dev->heads;
1597 sect = (u32)block % dev->sectors + 1;
1598
1599 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1600 (u32)block, track, cyl, head, sect);
1601
1602 /* Check whether the converted CHS can fit.
1603 Cylinder: 0-65535
1604 Head: 0-15
1605 Sector: 1-255*/
1606 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1607 goto out_of_range;
1608
1609 tf->command = ATA_CMD_VERIFY;
1610 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1611 tf->lbal = sect;
1612 tf->lbam = cyl;
1613 tf->lbah = cyl >> 8;
1614 tf->device |= head;
1615 }
1616
1617 return 0;
1618
1619 invalid_fld:
1620 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1621 /* "Invalid field in cbd" */
1622 return 1;
1623
1624 out_of_range:
1625 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1626 /* "Logical Block Address out of range" */
1627 return 1;
1628
1629 nothing_to_do:
1630 scmd->result = SAM_STAT_GOOD;
1631 return 1;
1632 }
1633
1634 /**
1635 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1636 * @qc: Storage for translated ATA taskfile
1637 *
1638 * Converts any of six SCSI read/write commands into the
1639 * ATA counterpart, including starting sector (LBA),
1640 * sector count, and taking into account the device's LBA48
1641 * support.
1642 *
1643 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1644 * %WRITE_16 are currently supported.
1645 *
1646 * LOCKING:
1647 * spin_lock_irqsave(host lock)
1648 *
1649 * RETURNS:
1650 * Zero on success, non-zero on error.
1651 */
1652 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1653 {
1654 struct scsi_cmnd *scmd = qc->scsicmd;
1655 const u8 *cdb = scmd->cmnd;
1656 unsigned int tf_flags = 0;
1657 u64 block;
1658 u32 n_block;
1659 int rc;
1660
1661 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1662 tf_flags |= ATA_TFLAG_WRITE;
1663
1664 /* Calculate the SCSI LBA, transfer length and FUA. */
1665 switch (cdb[0]) {
1666 case READ_10:
1667 case WRITE_10:
1668 if (unlikely(scmd->cmd_len < 10))
1669 goto invalid_fld;
1670 scsi_10_lba_len(cdb, &block, &n_block);
1671 if (cdb[1] & (1 << 3))
1672 tf_flags |= ATA_TFLAG_FUA;
1673 break;
1674 case READ_6:
1675 case WRITE_6:
1676 if (unlikely(scmd->cmd_len < 6))
1677 goto invalid_fld;
1678 scsi_6_lba_len(cdb, &block, &n_block);
1679
1680 /* for 6-byte r/w commands, transfer length 0
1681 * means 256 blocks of data, not 0 block.
1682 */
1683 if (!n_block)
1684 n_block = 256;
1685 break;
1686 case READ_16:
1687 case WRITE_16:
1688 if (unlikely(scmd->cmd_len < 16))
1689 goto invalid_fld;
1690 scsi_16_lba_len(cdb, &block, &n_block);
1691 if (cdb[1] & (1 << 3))
1692 tf_flags |= ATA_TFLAG_FUA;
1693 break;
1694 default:
1695 DPRINTK("no-byte command\n");
1696 goto invalid_fld;
1697 }
1698
1699 /* Check and compose ATA command */
1700 if (!n_block)
1701 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1702 * length 0 means transfer 0 block of data.
1703 * However, for ATA R/W commands, sector count 0 means
1704 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1705 *
1706 * WARNING: one or two older ATA drives treat 0 as 0...
1707 */
1708 goto nothing_to_do;
1709
1710 qc->flags |= ATA_QCFLAG_IO;
1711 qc->nbytes = n_block * scmd->device->sector_size;
1712
1713 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1714 qc->tag);
1715 if (likely(rc == 0))
1716 return 0;
1717
1718 if (rc == -ERANGE)
1719 goto out_of_range;
1720 /* treat all other errors as -EINVAL, fall through */
1721 invalid_fld:
1722 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1723 /* "Invalid field in cbd" */
1724 return 1;
1725
1726 out_of_range:
1727 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1728 /* "Logical Block Address out of range" */
1729 return 1;
1730
1731 nothing_to_do:
1732 scmd->result = SAM_STAT_GOOD;
1733 return 1;
1734 }
1735
1736 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1737 {
1738 struct ata_port *ap = qc->ap;
1739 struct scsi_cmnd *cmd = qc->scsicmd;
1740 u8 *cdb = cmd->cmnd;
1741 int need_sense = (qc->err_mask != 0);
1742
1743 /* For ATA pass thru (SAT) commands, generate a sense block if
1744 * user mandated it or if there's an error. Note that if we
1745 * generate because the user forced us to [CK_COND =1], a check
1746 * condition is generated and the ATA register values are returned
1747 * whether the command completed successfully or not. If there
1748 * was no error, we use the following sense data:
1749 * sk = RECOVERED ERROR
1750 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
1751 */
1752 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1753 ((cdb[2] & 0x20) || need_sense)) {
1754 ata_gen_passthru_sense(qc);
1755 } else {
1756 if (!need_sense) {
1757 cmd->result = SAM_STAT_GOOD;
1758 } else {
1759 /* TODO: decide which descriptor format to use
1760 * for 48b LBA devices and call that here
1761 * instead of the fixed desc, which is only
1762 * good for smaller LBA (and maybe CHS?)
1763 * devices.
1764 */
1765 ata_gen_ata_sense(qc);
1766 }
1767 }
1768
1769 if (need_sense && !ap->ops->error_handler)
1770 ata_dump_status(ap->print_id, &qc->result_tf);
1771
1772 qc->scsidone(cmd);
1773
1774 ata_qc_free(qc);
1775 }
1776
1777 /**
1778 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1779 * @dev: ATA device to which the command is addressed
1780 * @cmd: SCSI command to execute
1781 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1782 *
1783 * Our ->queuecommand() function has decided that the SCSI
1784 * command issued can be directly translated into an ATA
1785 * command, rather than handled internally.
1786 *
1787 * This function sets up an ata_queued_cmd structure for the
1788 * SCSI command, and sends that ata_queued_cmd to the hardware.
1789 *
1790 * The xlat_func argument (actor) returns 0 if ready to execute
1791 * ATA command, else 1 to finish translation. If 1 is returned
1792 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1793 * to be set reflecting an error condition or clean (early)
1794 * termination.
1795 *
1796 * LOCKING:
1797 * spin_lock_irqsave(host lock)
1798 *
1799 * RETURNS:
1800 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1801 * needs to be deferred.
1802 */
1803 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1804 ata_xlat_func_t xlat_func)
1805 {
1806 struct ata_port *ap = dev->link->ap;
1807 struct ata_queued_cmd *qc;
1808 int rc;
1809
1810 VPRINTK("ENTER\n");
1811
1812 qc = ata_scsi_qc_new(dev, cmd);
1813 if (!qc)
1814 goto err_mem;
1815
1816 /* data is present; dma-map it */
1817 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1818 cmd->sc_data_direction == DMA_TO_DEVICE) {
1819 if (unlikely(scsi_bufflen(cmd) < 1)) {
1820 ata_dev_warn(dev, "WARNING: zero len r/w req\n");
1821 goto err_did;
1822 }
1823
1824 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1825
1826 qc->dma_dir = cmd->sc_data_direction;
1827 }
1828
1829 qc->complete_fn = ata_scsi_qc_complete;
1830
1831 if (xlat_func(qc))
1832 goto early_finish;
1833
1834 if (ap->ops->qc_defer) {
1835 if ((rc = ap->ops->qc_defer(qc)))
1836 goto defer;
1837 }
1838
1839 /* select device, send command to hardware */
1840 ata_qc_issue(qc);
1841
1842 VPRINTK("EXIT\n");
1843 return 0;
1844
1845 early_finish:
1846 ata_qc_free(qc);
1847 cmd->scsi_done(cmd);
1848 DPRINTK("EXIT - early finish (good or error)\n");
1849 return 0;
1850
1851 err_did:
1852 ata_qc_free(qc);
1853 cmd->result = (DID_ERROR << 16);
1854 cmd->scsi_done(cmd);
1855 err_mem:
1856 DPRINTK("EXIT - internal\n");
1857 return 0;
1858
1859 defer:
1860 ata_qc_free(qc);
1861 DPRINTK("EXIT - defer\n");
1862 if (rc == ATA_DEFER_LINK)
1863 return SCSI_MLQUEUE_DEVICE_BUSY;
1864 else
1865 return SCSI_MLQUEUE_HOST_BUSY;
1866 }
1867
1868 /**
1869 * ata_scsi_rbuf_get - Map response buffer.
1870 * @cmd: SCSI command containing buffer to be mapped.
1871 * @flags: unsigned long variable to store irq enable status
1872 * @copy_in: copy in from user buffer
1873 *
1874 * Prepare buffer for simulated SCSI commands.
1875 *
1876 * LOCKING:
1877 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1878 *
1879 * RETURNS:
1880 * Pointer to response buffer.
1881 */
1882 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1883 unsigned long *flags)
1884 {
1885 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1886
1887 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1888 if (copy_in)
1889 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1890 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1891 return ata_scsi_rbuf;
1892 }
1893
1894 /**
1895 * ata_scsi_rbuf_put - Unmap response buffer.
1896 * @cmd: SCSI command containing buffer to be unmapped.
1897 * @copy_out: copy out result
1898 * @flags: @flags passed to ata_scsi_rbuf_get()
1899 *
1900 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1901 * @copy_back is true.
1902 *
1903 * LOCKING:
1904 * Unlocks ata_scsi_rbuf_lock.
1905 */
1906 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1907 unsigned long *flags)
1908 {
1909 if (copy_out)
1910 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1911 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1912 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1913 }
1914
1915 /**
1916 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1917 * @args: device IDENTIFY data / SCSI command of interest.
1918 * @actor: Callback hook for desired SCSI command simulator
1919 *
1920 * Takes care of the hard work of simulating a SCSI command...
1921 * Mapping the response buffer, calling the command's handler,
1922 * and handling the handler's return value. This return value
1923 * indicates whether the handler wishes the SCSI command to be
1924 * completed successfully (0), or not (in which case cmd->result
1925 * and sense buffer are assumed to be set).
1926 *
1927 * LOCKING:
1928 * spin_lock_irqsave(host lock)
1929 */
1930 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1931 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1932 {
1933 u8 *rbuf;
1934 unsigned int rc;
1935 struct scsi_cmnd *cmd = args->cmd;
1936 unsigned long flags;
1937
1938 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1939 rc = actor(args, rbuf);
1940 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
1941
1942 if (rc == 0)
1943 cmd->result = SAM_STAT_GOOD;
1944 args->done(cmd);
1945 }
1946
1947 /**
1948 * ata_scsiop_inq_std - Simulate INQUIRY command
1949 * @args: device IDENTIFY data / SCSI command of interest.
1950 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1951 *
1952 * Returns standard device identification data associated
1953 * with non-VPD INQUIRY command output.
1954 *
1955 * LOCKING:
1956 * spin_lock_irqsave(host lock)
1957 */
1958 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1959 {
1960 const u8 versions[] = {
1961 0x60, /* SAM-3 (no version claimed) */
1962
1963 0x03,
1964 0x20, /* SBC-2 (no version claimed) */
1965
1966 0x02,
1967 0x60 /* SPC-3 (no version claimed) */
1968 };
1969 u8 hdr[] = {
1970 TYPE_DISK,
1971 0,
1972 0x5, /* claim SPC-3 version compatibility */
1973 2,
1974 95 - 4
1975 };
1976
1977 VPRINTK("ENTER\n");
1978
1979 /* set scsi removeable (RMB) bit per ata bit */
1980 if (ata_id_removeable(args->id))
1981 hdr[1] |= (1 << 7);
1982
1983 memcpy(rbuf, hdr, sizeof(hdr));
1984 memcpy(&rbuf[8], "ATA ", 8);
1985 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1986 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1987
1988 if (rbuf[32] == 0 || rbuf[32] == ' ')
1989 memcpy(&rbuf[32], "n/a ", 4);
1990
1991 memcpy(rbuf + 59, versions, sizeof(versions));
1992
1993 return 0;
1994 }
1995
1996 /**
1997 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1998 * @args: device IDENTIFY data / SCSI command of interest.
1999 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2000 *
2001 * Returns list of inquiry VPD pages available.
2002 *
2003 * LOCKING:
2004 * spin_lock_irqsave(host lock)
2005 */
2006 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
2007 {
2008 const u8 pages[] = {
2009 0x00, /* page 0x00, this page */
2010 0x80, /* page 0x80, unit serial no page */
2011 0x83, /* page 0x83, device ident page */
2012 0x89, /* page 0x89, ata info page */
2013 0xb0, /* page 0xb0, block limits page */
2014 0xb1, /* page 0xb1, block device characteristics page */
2015 0xb2, /* page 0xb2, thin provisioning page */
2016 };
2017
2018 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
2019 memcpy(rbuf + 4, pages, sizeof(pages));
2020 return 0;
2021 }
2022
2023 /**
2024 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
2025 * @args: device IDENTIFY data / SCSI command of interest.
2026 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2027 *
2028 * Returns ATA device serial number.
2029 *
2030 * LOCKING:
2031 * spin_lock_irqsave(host lock)
2032 */
2033 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
2034 {
2035 const u8 hdr[] = {
2036 0,
2037 0x80, /* this page code */
2038 0,
2039 ATA_ID_SERNO_LEN, /* page len */
2040 };
2041
2042 memcpy(rbuf, hdr, sizeof(hdr));
2043 ata_id_string(args->id, (unsigned char *) &rbuf[4],
2044 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2045 return 0;
2046 }
2047
2048 /**
2049 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2050 * @args: device IDENTIFY data / SCSI command of interest.
2051 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2052 *
2053 * Yields two logical unit device identification designators:
2054 * - vendor specific ASCII containing the ATA serial number
2055 * - SAT defined "t10 vendor id based" containing ASCII vendor
2056 * name ("ATA "), model and serial numbers.
2057 *
2058 * LOCKING:
2059 * spin_lock_irqsave(host lock)
2060 */
2061 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
2062 {
2063 const int sat_model_serial_desc_len = 68;
2064 int num;
2065
2066 rbuf[1] = 0x83; /* this page code */
2067 num = 4;
2068
2069 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2070 rbuf[num + 0] = 2;
2071 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2072 num += 4;
2073 ata_id_string(args->id, (unsigned char *) rbuf + num,
2074 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2075 num += ATA_ID_SERNO_LEN;
2076
2077 /* SAT defined lu model and serial numbers descriptor */
2078 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2079 rbuf[num + 0] = 2;
2080 rbuf[num + 1] = 1;
2081 rbuf[num + 3] = sat_model_serial_desc_len;
2082 num += 4;
2083 memcpy(rbuf + num, "ATA ", 8);
2084 num += 8;
2085 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2086 ATA_ID_PROD_LEN);
2087 num += ATA_ID_PROD_LEN;
2088 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2089 ATA_ID_SERNO_LEN);
2090 num += ATA_ID_SERNO_LEN;
2091
2092 if (ata_id_has_wwn(args->id)) {
2093 /* SAT defined lu world wide name */
2094 /* piv=0, assoc=lu, code_set=binary, designator=NAA */
2095 rbuf[num + 0] = 1;
2096 rbuf[num + 1] = 3;
2097 rbuf[num + 3] = ATA_ID_WWN_LEN;
2098 num += 4;
2099 ata_id_string(args->id, (unsigned char *) rbuf + num,
2100 ATA_ID_WWN, ATA_ID_WWN_LEN);
2101 num += ATA_ID_WWN_LEN;
2102 }
2103 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
2104 return 0;
2105 }
2106
2107 /**
2108 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2109 * @args: device IDENTIFY data / SCSI command of interest.
2110 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2111 *
2112 * Yields SAT-specified ATA VPD page.
2113 *
2114 * LOCKING:
2115 * spin_lock_irqsave(host lock)
2116 */
2117 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
2118 {
2119 struct ata_taskfile tf;
2120
2121 memset(&tf, 0, sizeof(tf));
2122
2123 rbuf[1] = 0x89; /* our page code */
2124 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2125 rbuf[3] = (0x238 & 0xff);
2126
2127 memcpy(&rbuf[8], "linux ", 8);
2128 memcpy(&rbuf[16], "libata ", 16);
2129 memcpy(&rbuf[32], DRV_VERSION, 4);
2130
2131 /* we don't store the ATA device signature, so we fake it */
2132
2133 tf.command = ATA_DRDY; /* really, this is Status reg */
2134 tf.lbal = 0x1;
2135 tf.nsect = 0x1;
2136
2137 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2138 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
2139
2140 rbuf[56] = ATA_CMD_ID_ATA;
2141
2142 memcpy(&rbuf[60], &args->id[0], 512);
2143 return 0;
2144 }
2145
2146 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
2147 {
2148 u16 min_io_sectors;
2149
2150 rbuf[1] = 0xb0;
2151 rbuf[3] = 0x3c; /* required VPD size with unmap support */
2152
2153 /*
2154 * Optimal transfer length granularity.
2155 *
2156 * This is always one physical block, but for disks with a smaller
2157 * logical than physical sector size we need to figure out what the
2158 * latter is.
2159 */
2160 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
2161 put_unaligned_be16(min_io_sectors, &rbuf[6]);
2162
2163 /*
2164 * Optimal unmap granularity.
2165 *
2166 * The ATA spec doesn't even know about a granularity or alignment
2167 * for the TRIM command. We can leave away most of the unmap related
2168 * VPD page entries, but we have specifify a granularity to signal
2169 * that we support some form of unmap - in thise case via WRITE SAME
2170 * with the unmap bit set.
2171 */
2172 if (ata_id_has_trim(args->id)) {
2173 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
2174 put_unaligned_be32(1, &rbuf[28]);
2175 }
2176
2177 return 0;
2178 }
2179
2180 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2181 {
2182 int form_factor = ata_id_form_factor(args->id);
2183 int media_rotation_rate = ata_id_rotation_rate(args->id);
2184
2185 rbuf[1] = 0xb1;
2186 rbuf[3] = 0x3c;
2187 rbuf[4] = media_rotation_rate >> 8;
2188 rbuf[5] = media_rotation_rate;
2189 rbuf[7] = form_factor;
2190
2191 return 0;
2192 }
2193
2194 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
2195 {
2196 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2197 rbuf[1] = 0xb2;
2198 rbuf[3] = 0x4;
2199 rbuf[5] = 1 << 6; /* TPWS */
2200
2201 return 0;
2202 }
2203
2204 /**
2205 * ata_scsiop_noop - Command handler that simply returns success.
2206 * @args: device IDENTIFY data / SCSI command of interest.
2207 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2208 *
2209 * No operation. Simply returns success to caller, to indicate
2210 * that the caller should successfully complete this SCSI command.
2211 *
2212 * LOCKING:
2213 * spin_lock_irqsave(host lock)
2214 */
2215 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
2216 {
2217 VPRINTK("ENTER\n");
2218 return 0;
2219 }
2220
2221 /**
2222 * modecpy - Prepare response for MODE SENSE
2223 * @dest: output buffer
2224 * @src: data being copied
2225 * @n: length of mode page
2226 * @changeable: whether changeable parameters are requested
2227 *
2228 * Generate a generic MODE SENSE page for either current or changeable
2229 * parameters.
2230 *
2231 * LOCKING:
2232 * None.
2233 */
2234 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
2235 {
2236 if (changeable) {
2237 memcpy(dest, src, 2);
2238 memset(dest + 2, 0, n - 2);
2239 } else {
2240 memcpy(dest, src, n);
2241 }
2242 }
2243
2244 /**
2245 * ata_msense_caching - Simulate MODE SENSE caching info page
2246 * @id: device IDENTIFY data
2247 * @buf: output buffer
2248 * @changeable: whether changeable parameters are requested
2249 *
2250 * Generate a caching info page, which conditionally indicates
2251 * write caching to the SCSI layer, depending on device
2252 * capabilities.
2253 *
2254 * LOCKING:
2255 * None.
2256 */
2257 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
2258 {
2259 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
2260 if (changeable || ata_id_wcache_enabled(id))
2261 buf[2] |= (1 << 2); /* write cache enable */
2262 if (!changeable && !ata_id_rahead_enabled(id))
2263 buf[12] |= (1 << 5); /* disable read ahead */
2264 return sizeof(def_cache_mpage);
2265 }
2266
2267 /**
2268 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2269 * @buf: output buffer
2270 * @changeable: whether changeable parameters are requested
2271 *
2272 * Generate a generic MODE SENSE control mode page.
2273 *
2274 * LOCKING:
2275 * None.
2276 */
2277 static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable)
2278 {
2279 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable);
2280 return sizeof(def_control_mpage);
2281 }
2282
2283 /**
2284 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2285 * @buf: output buffer
2286 * @changeable: whether changeable parameters are requested
2287 *
2288 * Generate a generic MODE SENSE r/w error recovery page.
2289 *
2290 * LOCKING:
2291 * None.
2292 */
2293 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable)
2294 {
2295 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage),
2296 changeable);
2297 return sizeof(def_rw_recovery_mpage);
2298 }
2299
2300 /*
2301 * We can turn this into a real blacklist if it's needed, for now just
2302 * blacklist any Maxtor BANC1G10 revision firmware
2303 */
2304 static int ata_dev_supports_fua(u16 *id)
2305 {
2306 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2307
2308 if (!libata_fua)
2309 return 0;
2310 if (!ata_id_has_fua(id))
2311 return 0;
2312
2313 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2314 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2315
2316 if (strcmp(model, "Maxtor"))
2317 return 1;
2318 if (strcmp(fw, "BANC1G10"))
2319 return 1;
2320
2321 return 0; /* blacklisted */
2322 }
2323
2324 /**
2325 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2326 * @args: device IDENTIFY data / SCSI command of interest.
2327 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2328 *
2329 * Simulate MODE SENSE commands. Assume this is invoked for direct
2330 * access devices (e.g. disks) only. There should be no block
2331 * descriptor for other device types.
2332 *
2333 * LOCKING:
2334 * spin_lock_irqsave(host lock)
2335 */
2336 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
2337 {
2338 struct ata_device *dev = args->dev;
2339 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
2340 const u8 sat_blk_desc[] = {
2341 0, 0, 0, 0, /* number of blocks: sat unspecified */
2342 0,
2343 0, 0x2, 0x0 /* block length: 512 bytes */
2344 };
2345 u8 pg, spg;
2346 unsigned int ebd, page_control, six_byte;
2347 u8 dpofua;
2348
2349 VPRINTK("ENTER\n");
2350
2351 six_byte = (scsicmd[0] == MODE_SENSE);
2352 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2353 /*
2354 * LLBA bit in msense(10) ignored (compliant)
2355 */
2356
2357 page_control = scsicmd[2] >> 6;
2358 switch (page_control) {
2359 case 0: /* current */
2360 case 1: /* changeable */
2361 case 2: /* defaults */
2362 break; /* supported */
2363 case 3: /* saved */
2364 goto saving_not_supp;
2365 default:
2366 goto invalid_fld;
2367 }
2368
2369 if (six_byte)
2370 p += 4 + (ebd ? 8 : 0);
2371 else
2372 p += 8 + (ebd ? 8 : 0);
2373
2374 pg = scsicmd[2] & 0x3f;
2375 spg = scsicmd[3];
2376 /*
2377 * No mode subpages supported (yet) but asking for _all_
2378 * subpages may be valid
2379 */
2380 if (spg && (spg != ALL_SUB_MPAGES))
2381 goto invalid_fld;
2382
2383 switch(pg) {
2384 case RW_RECOVERY_MPAGE:
2385 p += ata_msense_rw_recovery(p, page_control == 1);
2386 break;
2387
2388 case CACHE_MPAGE:
2389 p += ata_msense_caching(args->id, p, page_control == 1);
2390 break;
2391
2392 case CONTROL_MPAGE:
2393 p += ata_msense_ctl_mode(p, page_control == 1);
2394 break;
2395
2396 case ALL_MPAGES:
2397 p += ata_msense_rw_recovery(p, page_control == 1);
2398 p += ata_msense_caching(args->id, p, page_control == 1);
2399 p += ata_msense_ctl_mode(p, page_control == 1);
2400 break;
2401
2402 default: /* invalid page code */
2403 goto invalid_fld;
2404 }
2405
2406 dpofua = 0;
2407 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2408 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2409 dpofua = 1 << 4;
2410
2411 if (six_byte) {
2412 rbuf[0] = p - rbuf - 1;
2413 rbuf[2] |= dpofua;
2414 if (ebd) {
2415 rbuf[3] = sizeof(sat_blk_desc);
2416 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2417 }
2418 } else {
2419 unsigned int output_len = p - rbuf - 2;
2420
2421 rbuf[0] = output_len >> 8;
2422 rbuf[1] = output_len;
2423 rbuf[3] |= dpofua;
2424 if (ebd) {
2425 rbuf[7] = sizeof(sat_blk_desc);
2426 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2427 }
2428 }
2429 return 0;
2430
2431 invalid_fld:
2432 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2433 /* "Invalid field in cbd" */
2434 return 1;
2435
2436 saving_not_supp:
2437 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2438 /* "Saving parameters not supported" */
2439 return 1;
2440 }
2441
2442 /**
2443 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2444 * @args: device IDENTIFY data / SCSI command of interest.
2445 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2446 *
2447 * Simulate READ CAPACITY commands.
2448 *
2449 * LOCKING:
2450 * None.
2451 */
2452 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
2453 {
2454 struct ata_device *dev = args->dev;
2455 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
2456 u32 sector_size; /* physical sector size in bytes */
2457 u8 log2_per_phys;
2458 u16 lowest_aligned;
2459
2460 sector_size = ata_id_logical_sector_size(dev->id);
2461 log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2462 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
2463
2464 VPRINTK("ENTER\n");
2465
2466 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2467 if (last_lba >= 0xffffffffULL)
2468 last_lba = 0xffffffff;
2469
2470 /* sector count, 32-bit */
2471 rbuf[0] = last_lba >> (8 * 3);
2472 rbuf[1] = last_lba >> (8 * 2);
2473 rbuf[2] = last_lba >> (8 * 1);
2474 rbuf[3] = last_lba;
2475
2476 /* sector size */
2477 rbuf[4] = sector_size >> (8 * 3);
2478 rbuf[5] = sector_size >> (8 * 2);
2479 rbuf[6] = sector_size >> (8 * 1);
2480 rbuf[7] = sector_size;
2481 } else {
2482 /* sector count, 64-bit */
2483 rbuf[0] = last_lba >> (8 * 7);
2484 rbuf[1] = last_lba >> (8 * 6);
2485 rbuf[2] = last_lba >> (8 * 5);
2486 rbuf[3] = last_lba >> (8 * 4);
2487 rbuf[4] = last_lba >> (8 * 3);
2488 rbuf[5] = last_lba >> (8 * 2);
2489 rbuf[6] = last_lba >> (8 * 1);
2490 rbuf[7] = last_lba;
2491
2492 /* sector size */
2493 rbuf[ 8] = sector_size >> (8 * 3);
2494 rbuf[ 9] = sector_size >> (8 * 2);
2495 rbuf[10] = sector_size >> (8 * 1);
2496 rbuf[11] = sector_size;
2497
2498 rbuf[12] = 0;
2499 rbuf[13] = log2_per_phys;
2500 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2501 rbuf[15] = lowest_aligned;
2502
2503 if (ata_id_has_trim(args->id)) {
2504 rbuf[14] |= 0x80; /* TPE */
2505
2506 if (ata_id_has_zero_after_trim(args->id))
2507 rbuf[14] |= 0x40; /* TPRZ */
2508 }
2509 }
2510
2511 return 0;
2512 }
2513
2514 /**
2515 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2516 * @args: device IDENTIFY data / SCSI command of interest.
2517 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2518 *
2519 * Simulate REPORT LUNS command.
2520 *
2521 * LOCKING:
2522 * spin_lock_irqsave(host lock)
2523 */
2524 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
2525 {
2526 VPRINTK("ENTER\n");
2527 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2528
2529 return 0;
2530 }
2531
2532 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2533 {
2534 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2535 /* FIXME: not quite right; we don't want the
2536 * translation of taskfile registers into
2537 * a sense descriptors, since that's only
2538 * correct for ATA, not ATAPI
2539 */
2540 ata_gen_passthru_sense(qc);
2541 }
2542
2543 qc->scsidone(qc->scsicmd);
2544 ata_qc_free(qc);
2545 }
2546
2547 /* is it pointless to prefer PIO for "safety reasons"? */
2548 static inline int ata_pio_use_silly(struct ata_port *ap)
2549 {
2550 return (ap->flags & ATA_FLAG_PIO_DMA);
2551 }
2552
2553 static void atapi_request_sense(struct ata_queued_cmd *qc)
2554 {
2555 struct ata_port *ap = qc->ap;
2556 struct scsi_cmnd *cmd = qc->scsicmd;
2557
2558 DPRINTK("ATAPI request sense\n");
2559
2560 /* FIXME: is this needed? */
2561 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2562
2563 #ifdef CONFIG_ATA_SFF
2564 if (ap->ops->sff_tf_read)
2565 ap->ops->sff_tf_read(ap, &qc->tf);
2566 #endif
2567
2568 /* fill these in, for the case where they are -not- overwritten */
2569 cmd->sense_buffer[0] = 0x70;
2570 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2571
2572 ata_qc_reinit(qc);
2573
2574 /* setup sg table and init transfer direction */
2575 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2576 ata_sg_init(qc, &qc->sgent, 1);
2577 qc->dma_dir = DMA_FROM_DEVICE;
2578
2579 memset(&qc->cdb, 0, qc->dev->cdb_len);
2580 qc->cdb[0] = REQUEST_SENSE;
2581 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2582
2583 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2584 qc->tf.command = ATA_CMD_PACKET;
2585
2586 if (ata_pio_use_silly(ap)) {
2587 qc->tf.protocol = ATAPI_PROT_DMA;
2588 qc->tf.feature |= ATAPI_PKT_DMA;
2589 } else {
2590 qc->tf.protocol = ATAPI_PROT_PIO;
2591 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2592 qc->tf.lbah = 0;
2593 }
2594 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2595
2596 qc->complete_fn = atapi_sense_complete;
2597
2598 ata_qc_issue(qc);
2599
2600 DPRINTK("EXIT\n");
2601 }
2602
2603 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2604 {
2605 struct scsi_cmnd *cmd = qc->scsicmd;
2606 unsigned int err_mask = qc->err_mask;
2607
2608 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2609
2610 /* handle completion from new EH */
2611 if (unlikely(qc->ap->ops->error_handler &&
2612 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2613
2614 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2615 /* FIXME: not quite right; we don't want the
2616 * translation of taskfile registers into a
2617 * sense descriptors, since that's only
2618 * correct for ATA, not ATAPI
2619 */
2620 ata_gen_passthru_sense(qc);
2621 }
2622
2623 /* SCSI EH automatically locks door if sdev->locked is
2624 * set. Sometimes door lock request continues to
2625 * fail, for example, when no media is present. This
2626 * creates a loop - SCSI EH issues door lock which
2627 * fails and gets invoked again to acquire sense data
2628 * for the failed command.
2629 *
2630 * If door lock fails, always clear sdev->locked to
2631 * avoid this infinite loop.
2632 *
2633 * This may happen before SCSI scan is complete. Make
2634 * sure qc->dev->sdev isn't NULL before dereferencing.
2635 */
2636 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
2637 qc->dev->sdev->locked = 0;
2638
2639 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2640 qc->scsidone(cmd);
2641 ata_qc_free(qc);
2642 return;
2643 }
2644
2645 /* successful completion or old EH failure path */
2646 if (unlikely(err_mask & AC_ERR_DEV)) {
2647 cmd->result = SAM_STAT_CHECK_CONDITION;
2648 atapi_request_sense(qc);
2649 return;
2650 } else if (unlikely(err_mask)) {
2651 /* FIXME: not quite right; we don't want the
2652 * translation of taskfile registers into
2653 * a sense descriptors, since that's only
2654 * correct for ATA, not ATAPI
2655 */
2656 ata_gen_passthru_sense(qc);
2657 } else {
2658 u8 *scsicmd = cmd->cmnd;
2659
2660 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2661 unsigned long flags;
2662 u8 *buf;
2663
2664 buf = ata_scsi_rbuf_get(cmd, true, &flags);
2665
2666 /* ATAPI devices typically report zero for their SCSI version,
2667 * and sometimes deviate from the spec WRT response data
2668 * format. If SCSI version is reported as zero like normal,
2669 * then we make the following fixups: 1) Fake MMC-5 version,
2670 * to indicate to the Linux scsi midlayer this is a modern
2671 * device. 2) Ensure response data format / ATAPI information
2672 * are always correct.
2673 */
2674 if (buf[2] == 0) {
2675 buf[2] = 0x5;
2676 buf[3] = 0x32;
2677 }
2678
2679 ata_scsi_rbuf_put(cmd, true, &flags);
2680 }
2681
2682 cmd->result = SAM_STAT_GOOD;
2683 }
2684
2685 qc->scsidone(cmd);
2686 ata_qc_free(qc);
2687 }
2688 /**
2689 * atapi_xlat - Initialize PACKET taskfile
2690 * @qc: command structure to be initialized
2691 *
2692 * LOCKING:
2693 * spin_lock_irqsave(host lock)
2694 *
2695 * RETURNS:
2696 * Zero on success, non-zero on failure.
2697 */
2698 static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2699 {
2700 struct scsi_cmnd *scmd = qc->scsicmd;
2701 struct ata_device *dev = qc->dev;
2702 int nodata = (scmd->sc_data_direction == DMA_NONE);
2703 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2704 unsigned int nbytes;
2705
2706 memset(qc->cdb, 0, dev->cdb_len);
2707 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2708
2709 qc->complete_fn = atapi_qc_complete;
2710
2711 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2712 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2713 qc->tf.flags |= ATA_TFLAG_WRITE;
2714 DPRINTK("direction: write\n");
2715 }
2716
2717 qc->tf.command = ATA_CMD_PACKET;
2718 ata_qc_set_pc_nbytes(qc);
2719
2720 /* check whether ATAPI DMA is safe */
2721 if (!nodata && !using_pio && atapi_check_dma(qc))
2722 using_pio = 1;
2723
2724 /* Some controller variants snoop this value for Packet
2725 * transfers to do state machine and FIFO management. Thus we
2726 * want to set it properly, and for DMA where it is
2727 * effectively meaningless.
2728 */
2729 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2730
2731 /* Most ATAPI devices which honor transfer chunk size don't
2732 * behave according to the spec when odd chunk size which
2733 * matches the transfer length is specified. If the number of
2734 * bytes to transfer is 2n+1. According to the spec, what
2735 * should happen is to indicate that 2n+1 is going to be
2736 * transferred and transfer 2n+2 bytes where the last byte is
2737 * padding.
2738 *
2739 * In practice, this doesn't happen. ATAPI devices first
2740 * indicate and transfer 2n bytes and then indicate and
2741 * transfer 2 bytes where the last byte is padding.
2742 *
2743 * This inconsistency confuses several controllers which
2744 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2745 * These controllers use actual number of transferred bytes to
2746 * update DMA poitner and transfer of 4n+2 bytes make those
2747 * controller push DMA pointer by 4n+4 bytes because SATA data
2748 * FISes are aligned to 4 bytes. This causes data corruption
2749 * and buffer overrun.
2750 *
2751 * Always setting nbytes to even number solves this problem
2752 * because then ATAPI devices don't have to split data at 2n
2753 * boundaries.
2754 */
2755 if (nbytes & 0x1)
2756 nbytes++;
2757
2758 qc->tf.lbam = (nbytes & 0xFF);
2759 qc->tf.lbah = (nbytes >> 8);
2760
2761 if (nodata)
2762 qc->tf.protocol = ATAPI_PROT_NODATA;
2763 else if (using_pio)
2764 qc->tf.protocol = ATAPI_PROT_PIO;
2765 else {
2766 /* DMA data xfer */
2767 qc->tf.protocol = ATAPI_PROT_DMA;
2768 qc->tf.feature |= ATAPI_PKT_DMA;
2769
2770 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2771 (scmd->sc_data_direction != DMA_TO_DEVICE))
2772 /* some SATA bridges need us to indicate data xfer direction */
2773 qc->tf.feature |= ATAPI_DMADIR;
2774 }
2775
2776
2777 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2778 as ATAPI tape drives don't get this right otherwise */
2779 return 0;
2780 }
2781
2782 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2783 {
2784 if (!sata_pmp_attached(ap)) {
2785 if (likely(devno < ata_link_max_devices(&ap->link)))
2786 return &ap->link.device[devno];
2787 } else {
2788 if (likely(devno < ap->nr_pmp_links))
2789 return &ap->pmp_link[devno].device[0];
2790 }
2791
2792 return NULL;
2793 }
2794
2795 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2796 const struct scsi_device *scsidev)
2797 {
2798 int devno;
2799
2800 /* skip commands not addressed to targets we simulate */
2801 if (!sata_pmp_attached(ap)) {
2802 if (unlikely(scsidev->channel || scsidev->lun))
2803 return NULL;
2804 devno = scsidev->id;
2805 } else {
2806 if (unlikely(scsidev->id || scsidev->lun))
2807 return NULL;
2808 devno = scsidev->channel;
2809 }
2810
2811 return ata_find_dev(ap, devno);
2812 }
2813
2814 /**
2815 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2816 * @ap: ATA port to which the device is attached
2817 * @scsidev: SCSI device from which we derive the ATA device
2818 *
2819 * Given various information provided in struct scsi_cmnd,
2820 * map that onto an ATA bus, and using that mapping
2821 * determine which ata_device is associated with the
2822 * SCSI command to be sent.
2823 *
2824 * LOCKING:
2825 * spin_lock_irqsave(host lock)
2826 *
2827 * RETURNS:
2828 * Associated ATA device, or %NULL if not found.
2829 */
2830 static struct ata_device *
2831 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2832 {
2833 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2834
2835 if (unlikely(!dev || !ata_dev_enabled(dev)))
2836 return NULL;
2837
2838 return dev;
2839 }
2840
2841 /*
2842 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2843 * @byte1: Byte 1 from pass-thru CDB.
2844 *
2845 * RETURNS:
2846 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2847 */
2848 static u8
2849 ata_scsi_map_proto(u8 byte1)
2850 {
2851 switch((byte1 & 0x1e) >> 1) {
2852 case 3: /* Non-data */
2853 return ATA_PROT_NODATA;
2854
2855 case 6: /* DMA */
2856 case 10: /* UDMA Data-in */
2857 case 11: /* UDMA Data-Out */
2858 return ATA_PROT_DMA;
2859
2860 case 4: /* PIO Data-in */
2861 case 5: /* PIO Data-out */
2862 return ATA_PROT_PIO;
2863
2864 case 0: /* Hard Reset */
2865 case 1: /* SRST */
2866 case 8: /* Device Diagnostic */
2867 case 9: /* Device Reset */
2868 case 7: /* DMA Queued */
2869 case 12: /* FPDMA */
2870 case 15: /* Return Response Info */
2871 default: /* Reserved */
2872 break;
2873 }
2874
2875 return ATA_PROT_UNKNOWN;
2876 }
2877
2878 /**
2879 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2880 * @qc: command structure to be initialized
2881 *
2882 * Handles either 12 or 16-byte versions of the CDB.
2883 *
2884 * RETURNS:
2885 * Zero on success, non-zero on failure.
2886 */
2887 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2888 {
2889 struct ata_taskfile *tf = &(qc->tf);
2890 struct scsi_cmnd *scmd = qc->scsicmd;
2891 struct ata_device *dev = qc->dev;
2892 const u8 *cdb = scmd->cmnd;
2893
2894 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2895 goto invalid_fld;
2896
2897 /*
2898 * 12 and 16 byte CDBs use different offsets to
2899 * provide the various register values.
2900 */
2901 if (cdb[0] == ATA_16) {
2902 /*
2903 * 16-byte CDB - may contain extended commands.
2904 *
2905 * If that is the case, copy the upper byte register values.
2906 */
2907 if (cdb[1] & 0x01) {
2908 tf->hob_feature = cdb[3];
2909 tf->hob_nsect = cdb[5];
2910 tf->hob_lbal = cdb[7];
2911 tf->hob_lbam = cdb[9];
2912 tf->hob_lbah = cdb[11];
2913 tf->flags |= ATA_TFLAG_LBA48;
2914 } else
2915 tf->flags &= ~ATA_TFLAG_LBA48;
2916
2917 /*
2918 * Always copy low byte, device and command registers.
2919 */
2920 tf->feature = cdb[4];
2921 tf->nsect = cdb[6];
2922 tf->lbal = cdb[8];
2923 tf->lbam = cdb[10];
2924 tf->lbah = cdb[12];
2925 tf->device = cdb[13];
2926 tf->command = cdb[14];
2927 } else {
2928 /*
2929 * 12-byte CDB - incapable of extended commands.
2930 */
2931 tf->flags &= ~ATA_TFLAG_LBA48;
2932
2933 tf->feature = cdb[3];
2934 tf->nsect = cdb[4];
2935 tf->lbal = cdb[5];
2936 tf->lbam = cdb[6];
2937 tf->lbah = cdb[7];
2938 tf->device = cdb[8];
2939 tf->command = cdb[9];
2940 }
2941
2942 /* enforce correct master/slave bit */
2943 tf->device = dev->devno ?
2944 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2945
2946 switch (tf->command) {
2947 /* READ/WRITE LONG use a non-standard sect_size */
2948 case ATA_CMD_READ_LONG:
2949 case ATA_CMD_READ_LONG_ONCE:
2950 case ATA_CMD_WRITE_LONG:
2951 case ATA_CMD_WRITE_LONG_ONCE:
2952 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2953 goto invalid_fld;
2954 qc->sect_size = scsi_bufflen(scmd);
2955 break;
2956
2957 /* commands using reported Logical Block size (e.g. 512 or 4K) */
2958 case ATA_CMD_CFA_WRITE_NE:
2959 case ATA_CMD_CFA_TRANS_SECT:
2960 case ATA_CMD_CFA_WRITE_MULT_NE:
2961 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
2962 case ATA_CMD_READ:
2963 case ATA_CMD_READ_EXT:
2964 case ATA_CMD_READ_QUEUED:
2965 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
2966 case ATA_CMD_FPDMA_READ:
2967 case ATA_CMD_READ_MULTI:
2968 case ATA_CMD_READ_MULTI_EXT:
2969 case ATA_CMD_PIO_READ:
2970 case ATA_CMD_PIO_READ_EXT:
2971 case ATA_CMD_READ_STREAM_DMA_EXT:
2972 case ATA_CMD_READ_STREAM_EXT:
2973 case ATA_CMD_VERIFY:
2974 case ATA_CMD_VERIFY_EXT:
2975 case ATA_CMD_WRITE:
2976 case ATA_CMD_WRITE_EXT:
2977 case ATA_CMD_WRITE_FUA_EXT:
2978 case ATA_CMD_WRITE_QUEUED:
2979 case ATA_CMD_WRITE_QUEUED_FUA_EXT:
2980 case ATA_CMD_FPDMA_WRITE:
2981 case ATA_CMD_WRITE_MULTI:
2982 case ATA_CMD_WRITE_MULTI_EXT:
2983 case ATA_CMD_WRITE_MULTI_FUA_EXT:
2984 case ATA_CMD_PIO_WRITE:
2985 case ATA_CMD_PIO_WRITE_EXT:
2986 case ATA_CMD_WRITE_STREAM_DMA_EXT:
2987 case ATA_CMD_WRITE_STREAM_EXT:
2988 qc->sect_size = scmd->device->sector_size;
2989 break;
2990
2991 /* Everything else uses 512 byte "sectors" */
2992 default:
2993 qc->sect_size = ATA_SECT_SIZE;
2994 }
2995
2996 /*
2997 * Set flags so that all registers will be written, pass on
2998 * write indication (used for PIO/DMA setup), result TF is
2999 * copied back and we don't whine too much about its failure.
3000 */
3001 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3002 if (scmd->sc_data_direction == DMA_TO_DEVICE)
3003 tf->flags |= ATA_TFLAG_WRITE;
3004
3005 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
3006
3007 /*
3008 * Set transfer length.
3009 *
3010 * TODO: find out if we need to do more here to
3011 * cover scatter/gather case.
3012 */
3013 ata_qc_set_pc_nbytes(qc);
3014
3015 /* We may not issue DMA commands if no DMA mode is set */
3016 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
3017 goto invalid_fld;
3018
3019 /* sanity check for pio multi commands */
3020 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
3021 goto invalid_fld;
3022
3023 if (is_multi_taskfile(tf)) {
3024 unsigned int multi_count = 1 << (cdb[1] >> 5);
3025
3026 /* compare the passed through multi_count
3027 * with the cached multi_count of libata
3028 */
3029 if (multi_count != dev->multi_count)
3030 ata_dev_warn(dev, "invalid multi_count %u ignored\n",
3031 multi_count);
3032 }
3033
3034 /*
3035 * Filter SET_FEATURES - XFER MODE command -- otherwise,
3036 * SET_FEATURES - XFER MODE must be preceded/succeeded
3037 * by an update to hardware-specific registers for each
3038 * controller (i.e. the reason for ->set_piomode(),
3039 * ->set_dmamode(), and ->post_set_mode() hooks).
3040 */
3041 if (tf->command == ATA_CMD_SET_FEATURES &&
3042 tf->feature == SETFEATURES_XFER)
3043 goto invalid_fld;
3044
3045 /*
3046 * Filter TPM commands by default. These provide an
3047 * essentially uncontrolled encrypted "back door" between
3048 * applications and the disk. Set libata.allow_tpm=1 if you
3049 * have a real reason for wanting to use them. This ensures
3050 * that installed software cannot easily mess stuff up without
3051 * user intent. DVR type users will probably ship with this enabled
3052 * for movie content management.
3053 *
3054 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3055 * for this and should do in future but that it is not sufficient as
3056 * DCS is an optional feature set. Thus we also do the software filter
3057 * so that we comply with the TC consortium stated goal that the user
3058 * can turn off TC features of their system.
3059 */
3060 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
3061 goto invalid_fld;
3062
3063 return 0;
3064
3065 invalid_fld:
3066 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3067 /* "Invalid field in cdb" */
3068 return 1;
3069 }
3070
3071 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3072 {
3073 struct ata_taskfile *tf = &qc->tf;
3074 struct scsi_cmnd *scmd = qc->scsicmd;
3075 struct ata_device *dev = qc->dev;
3076 const u8 *cdb = scmd->cmnd;
3077 u64 block;
3078 u32 n_block;
3079 u32 size;
3080 void *buf;
3081
3082 /* we may not issue DMA commands if no DMA mode is set */
3083 if (unlikely(!dev->dma_mode))
3084 goto invalid_fld;
3085
3086 if (unlikely(scmd->cmd_len < 16))
3087 goto invalid_fld;
3088 scsi_16_lba_len(cdb, &block, &n_block);
3089
3090 /* for now we only support WRITE SAME with the unmap bit set */
3091 if (unlikely(!(cdb[1] & 0x8)))
3092 goto invalid_fld;
3093
3094 /*
3095 * WRITE SAME always has a sector sized buffer as payload, this
3096 * should never be a multiple entry S/G list.
3097 */
3098 if (!scsi_sg_count(scmd))
3099 goto invalid_fld;
3100
3101 buf = page_address(sg_page(scsi_sglist(scmd)));
3102 size = ata_set_lba_range_entries(buf, 512, block, n_block);
3103
3104 tf->protocol = ATA_PROT_DMA;
3105 tf->hob_feature = 0;
3106 tf->feature = ATA_DSM_TRIM;
3107 tf->hob_nsect = (size / 512) >> 8;
3108 tf->nsect = size / 512;
3109 tf->command = ATA_CMD_DSM;
3110 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3111 ATA_TFLAG_WRITE;
3112
3113 ata_qc_set_pc_nbytes(qc);
3114
3115 return 0;
3116
3117 invalid_fld:
3118 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3119 /* "Invalid field in cdb" */
3120 return 1;
3121 }
3122
3123 /**
3124 * ata_mselect_caching - Simulate MODE SELECT for caching info page
3125 * @qc: Storage for translated ATA taskfile
3126 * @buf: input buffer
3127 * @len: number of valid bytes in the input buffer
3128 *
3129 * Prepare a taskfile to modify caching information for the device.
3130 *
3131 * LOCKING:
3132 * None.
3133 */
3134 static int ata_mselect_caching(struct ata_queued_cmd *qc,
3135 const u8 *buf, int len)
3136 {
3137 struct ata_taskfile *tf = &qc->tf;
3138 struct ata_device *dev = qc->dev;
3139 char mpage[CACHE_MPAGE_LEN];
3140 u8 wce;
3141
3142 /*
3143 * The first two bytes of def_cache_mpage are a header, so offsets
3144 * in mpage are off by 2 compared to buf. Same for len.
3145 */
3146
3147 if (len != CACHE_MPAGE_LEN - 2)
3148 return -EINVAL;
3149
3150 wce = buf[0] & (1 << 2);
3151
3152 /*
3153 * Check that read-only bits are not modified.
3154 */
3155 ata_msense_caching(dev->id, mpage, false);
3156 mpage[2] &= ~(1 << 2);
3157 mpage[2] |= wce;
3158 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0)
3159 return -EINVAL;
3160
3161 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3162 tf->protocol = ATA_PROT_NODATA;
3163 tf->nsect = 0;
3164 tf->command = ATA_CMD_SET_FEATURES;
3165 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF;
3166 return 0;
3167 }
3168
3169 /**
3170 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands
3171 * @qc: Storage for translated ATA taskfile
3172 *
3173 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
3174 * Assume this is invoked for direct access devices (e.g. disks) only.
3175 * There should be no block descriptor for other device types.
3176 *
3177 * LOCKING:
3178 * spin_lock_irqsave(host lock)
3179 */
3180 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
3181 {
3182 struct scsi_cmnd *scmd = qc->scsicmd;
3183 const u8 *cdb = scmd->cmnd;
3184 const u8 *p;
3185 u8 pg, spg;
3186 unsigned six_byte, pg_len, hdr_len, bd_len;
3187 int len;
3188
3189 VPRINTK("ENTER\n");
3190
3191 six_byte = (cdb[0] == MODE_SELECT);
3192 if (six_byte) {
3193 if (scmd->cmd_len < 5)
3194 goto invalid_fld;
3195
3196 len = cdb[4];
3197 hdr_len = 4;
3198 } else {
3199 if (scmd->cmd_len < 9)
3200 goto invalid_fld;
3201
3202 len = (cdb[7] << 8) + cdb[8];
3203 hdr_len = 8;
3204 }
3205
3206 /* We only support PF=1, SP=0. */
3207 if ((cdb[1] & 0x11) != 0x10)
3208 goto invalid_fld;
3209
3210 /* Test early for possible overrun. */
3211 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len)
3212 goto invalid_param_len;
3213
3214 p = page_address(sg_page(scsi_sglist(scmd)));
3215
3216 /* Move past header and block descriptors. */
3217 if (len < hdr_len)
3218 goto invalid_param_len;
3219
3220 if (six_byte)
3221 bd_len = p[3];
3222 else
3223 bd_len = (p[6] << 8) + p[7];
3224
3225 len -= hdr_len;
3226 p += hdr_len;
3227 if (len < bd_len)
3228 goto invalid_param_len;
3229 if (bd_len != 0 && bd_len != 8)
3230 goto invalid_param;
3231
3232 len -= bd_len;
3233 p += bd_len;
3234 if (len == 0)
3235 goto skip;
3236
3237 /* Parse both possible formats for the mode page headers. */
3238 pg = p[0] & 0x3f;
3239 if (p[0] & 0x40) {
3240 if (len < 4)
3241 goto invalid_param_len;
3242
3243 spg = p[1];
3244 pg_len = (p[2] << 8) | p[3];
3245 p += 4;
3246 len -= 4;
3247 } else {
3248 if (len < 2)
3249 goto invalid_param_len;
3250
3251 spg = 0;
3252 pg_len = p[1];
3253 p += 2;
3254 len -= 2;
3255 }
3256
3257 /*
3258 * No mode subpages supported (yet) but asking for _all_
3259 * subpages may be valid
3260 */
3261 if (spg && (spg != ALL_SUB_MPAGES))
3262 goto invalid_param;
3263 if (pg_len > len)
3264 goto invalid_param_len;
3265
3266 switch (pg) {
3267 case CACHE_MPAGE:
3268 if (ata_mselect_caching(qc, p, pg_len) < 0)
3269 goto invalid_param;
3270 break;
3271
3272 default: /* invalid page code */
3273 goto invalid_param;
3274 }
3275
3276 /*
3277 * Only one page has changeable data, so we only support setting one
3278 * page at a time.
3279 */
3280 if (len > pg_len)
3281 goto invalid_param;
3282
3283 return 0;
3284
3285 invalid_fld:
3286 /* "Invalid field in CDB" */
3287 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
3288 return 1;
3289
3290 invalid_param:
3291 /* "Invalid field in parameter list" */
3292 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0);
3293 return 1;
3294
3295 invalid_param_len:
3296 /* "Parameter list length error" */
3297 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3298 return 1;
3299
3300 skip:
3301 scmd->result = SAM_STAT_GOOD;
3302 return 1;
3303 }
3304
3305 /**
3306 * ata_get_xlat_func - check if SCSI to ATA translation is possible
3307 * @dev: ATA device
3308 * @cmd: SCSI command opcode to consider
3309 *
3310 * Look up the SCSI command given, and determine whether the
3311 * SCSI command is to be translated or simulated.
3312 *
3313 * RETURNS:
3314 * Pointer to translation function if possible, %NULL if not.
3315 */
3316
3317 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
3318 {
3319 switch (cmd) {
3320 case READ_6:
3321 case READ_10:
3322 case READ_16:
3323
3324 case WRITE_6:
3325 case WRITE_10:
3326 case WRITE_16:
3327 return ata_scsi_rw_xlat;
3328
3329 case WRITE_SAME_16:
3330 return ata_scsi_write_same_xlat;
3331
3332 case SYNCHRONIZE_CACHE:
3333 if (ata_try_flush_cache(dev))
3334 return ata_scsi_flush_xlat;
3335 break;
3336
3337 case VERIFY:
3338 case VERIFY_16:
3339 return ata_scsi_verify_xlat;
3340
3341 case ATA_12:
3342 case ATA_16:
3343 return ata_scsi_pass_thru;
3344
3345 case MODE_SELECT:
3346 case MODE_SELECT_10:
3347 return ata_scsi_mode_select_xlat;
3348 break;
3349
3350 case START_STOP:
3351 return ata_scsi_start_stop_xlat;
3352 }
3353
3354 return NULL;
3355 }
3356
3357 /**
3358 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3359 * @ap: ATA port to which the command was being sent
3360 * @cmd: SCSI command to dump
3361 *
3362 * Prints the contents of a SCSI command via printk().
3363 */
3364
3365 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
3366 struct scsi_cmnd *cmd)
3367 {
3368 #ifdef ATA_DEBUG
3369 struct scsi_device *scsidev = cmd->device;
3370 u8 *scsicmd = cmd->cmnd;
3371
3372 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
3373 ap->print_id,
3374 scsidev->channel, scsidev->id, scsidev->lun,
3375 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
3376 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
3377 scsicmd[8]);
3378 #endif
3379 }
3380
3381 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
3382 struct ata_device *dev)
3383 {
3384 u8 scsi_op = scmd->cmnd[0];
3385 ata_xlat_func_t xlat_func;
3386 int rc = 0;
3387
3388 if (dev->class == ATA_DEV_ATA) {
3389 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
3390 goto bad_cdb_len;
3391
3392 xlat_func = ata_get_xlat_func(dev, scsi_op);
3393 } else {
3394 if (unlikely(!scmd->cmd_len))
3395 goto bad_cdb_len;
3396
3397 xlat_func = NULL;
3398 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
3399 /* relay SCSI command to ATAPI device */
3400 int len = COMMAND_SIZE(scsi_op);
3401 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
3402 goto bad_cdb_len;
3403
3404 xlat_func = atapi_xlat;
3405 } else {
3406 /* ATA_16 passthru, treat as an ATA command */
3407 if (unlikely(scmd->cmd_len > 16))
3408 goto bad_cdb_len;
3409
3410 xlat_func = ata_get_xlat_func(dev, scsi_op);
3411 }
3412 }
3413
3414 if (xlat_func)
3415 rc = ata_scsi_translate(dev, scmd, xlat_func);
3416 else
3417 ata_scsi_simulate(dev, scmd);
3418
3419 return rc;
3420
3421 bad_cdb_len:
3422 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3423 scmd->cmd_len, scsi_op, dev->cdb_len);
3424 scmd->result = DID_ERROR << 16;
3425 scmd->scsi_done(scmd);
3426 return 0;
3427 }
3428
3429 /**
3430 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3431 * @shost: SCSI host of command to be sent
3432 * @cmd: SCSI command to be sent
3433 *
3434 * In some cases, this function translates SCSI commands into
3435 * ATA taskfiles, and queues the taskfiles to be sent to
3436 * hardware. In other cases, this function simulates a
3437 * SCSI device by evaluating and responding to certain
3438 * SCSI commands. This creates the overall effect of
3439 * ATA and ATAPI devices appearing as SCSI devices.
3440 *
3441 * LOCKING:
3442 * ATA host lock
3443 *
3444 * RETURNS:
3445 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3446 * 0 otherwise.
3447 */
3448 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
3449 {
3450 struct ata_port *ap;
3451 struct ata_device *dev;
3452 struct scsi_device *scsidev = cmd->device;
3453 int rc = 0;
3454 unsigned long irq_flags;
3455
3456 ap = ata_shost_to_port(shost);
3457
3458 spin_lock_irqsave(ap->lock, irq_flags);
3459
3460 ata_scsi_dump_cdb(ap, cmd);
3461
3462 dev = ata_scsi_find_dev(ap, scsidev);
3463 if (likely(dev))
3464 rc = __ata_scsi_queuecmd(cmd, dev);
3465 else {
3466 cmd->result = (DID_BAD_TARGET << 16);
3467 cmd->scsi_done(cmd);
3468 }
3469
3470 spin_unlock_irqrestore(ap->lock, irq_flags);
3471
3472 return rc;
3473 }
3474
3475 /**
3476 * ata_scsi_simulate - simulate SCSI command on ATA device
3477 * @dev: the target device
3478 * @cmd: SCSI command being sent to device.
3479 *
3480 * Interprets and directly executes a select list of SCSI commands
3481 * that can be handled internally.
3482 *
3483 * LOCKING:
3484 * spin_lock_irqsave(host lock)
3485 */
3486
3487 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
3488 {
3489 struct ata_scsi_args args;
3490 const u8 *scsicmd = cmd->cmnd;
3491 u8 tmp8;
3492
3493 args.dev = dev;
3494 args.id = dev->id;
3495 args.cmd = cmd;
3496 args.done = cmd->scsi_done;
3497
3498 switch(scsicmd[0]) {
3499 /* TODO: worth improving? */
3500 case FORMAT_UNIT:
3501 ata_scsi_invalid_field(cmd);
3502 break;
3503
3504 case INQUIRY:
3505 if (scsicmd[1] & 2) /* is CmdDt set? */
3506 ata_scsi_invalid_field(cmd);
3507 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3508 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3509 else switch (scsicmd[2]) {
3510 case 0x00:
3511 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3512 break;
3513 case 0x80:
3514 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3515 break;
3516 case 0x83:
3517 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3518 break;
3519 case 0x89:
3520 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3521 break;
3522 case 0xb0:
3523 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
3524 break;
3525 case 0xb1:
3526 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3527 break;
3528 case 0xb2:
3529 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
3530 break;
3531 default:
3532 ata_scsi_invalid_field(cmd);
3533 break;
3534 }
3535 break;
3536
3537 case MODE_SENSE:
3538 case MODE_SENSE_10:
3539 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3540 break;
3541
3542 case READ_CAPACITY:
3543 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3544 break;
3545
3546 case SERVICE_ACTION_IN:
3547 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3548 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3549 else
3550 ata_scsi_invalid_field(cmd);
3551 break;
3552
3553 case REPORT_LUNS:
3554 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3555 break;
3556
3557 case REQUEST_SENSE:
3558 ata_scsi_set_sense(cmd, 0, 0, 0);
3559 cmd->result = (DRIVER_SENSE << 24);
3560 cmd->scsi_done(cmd);
3561 break;
3562
3563 /* if we reach this, then writeback caching is disabled,
3564 * turning this into a no-op.
3565 */
3566 case SYNCHRONIZE_CACHE:
3567 /* fall through */
3568
3569 /* no-op's, complete with success */
3570 case REZERO_UNIT:
3571 case SEEK_6:
3572 case SEEK_10:
3573 case TEST_UNIT_READY:
3574 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3575 break;
3576
3577 case SEND_DIAGNOSTIC:
3578 tmp8 = scsicmd[1] & ~(1 << 3);
3579 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3580 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3581 else
3582 ata_scsi_invalid_field(cmd);
3583 break;
3584
3585 /* all other commands */
3586 default:
3587 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3588 /* "Invalid command operation code" */
3589 cmd->scsi_done(cmd);
3590 break;
3591 }
3592 }
3593
3594 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3595 {
3596 int i, rc;
3597
3598 for (i = 0; i < host->n_ports; i++) {
3599 struct ata_port *ap = host->ports[i];
3600 struct Scsi_Host *shost;
3601
3602 rc = -ENOMEM;
3603 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3604 if (!shost)
3605 goto err_alloc;
3606
3607 shost->eh_noresume = 1;
3608 *(struct ata_port **)&shost->hostdata[0] = ap;
3609 ap->scsi_host = shost;
3610
3611 shost->transportt = ata_scsi_transport_template;
3612 shost->unique_id = ap->print_id;
3613 shost->max_id = 16;
3614 shost->max_lun = 1;
3615 shost->max_channel = 1;
3616 shost->max_cmd_len = 16;
3617
3618 /* Schedule policy is determined by ->qc_defer()
3619 * callback and it needs to see every deferred qc.
3620 * Set host_blocked to 1 to prevent SCSI midlayer from
3621 * automatically deferring requests.
3622 */
3623 shost->max_host_blocked = 1;
3624
3625 rc = scsi_add_host_with_dma(ap->scsi_host,
3626 &ap->tdev, ap->host->dev);
3627 if (rc)
3628 goto err_add;
3629 }
3630
3631 return 0;
3632
3633 err_add:
3634 scsi_host_put(host->ports[i]->scsi_host);
3635 err_alloc:
3636 while (--i >= 0) {
3637 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3638
3639 scsi_remove_host(shost);
3640 scsi_host_put(shost);
3641 }
3642 return rc;
3643 }
3644
3645 void ata_scsi_scan_host(struct ata_port *ap, int sync)
3646 {
3647 int tries = 5;
3648 struct ata_device *last_failed_dev = NULL;
3649 struct ata_link *link;
3650 struct ata_device *dev;
3651
3652 repeat:
3653 ata_for_each_link(link, ap, EDGE) {
3654 ata_for_each_dev(dev, link, ENABLED) {
3655 struct scsi_device *sdev;
3656 int channel = 0, id = 0;
3657
3658 if (dev->sdev)
3659 continue;
3660
3661 if (ata_is_host_link(link))
3662 id = dev->devno;
3663 else
3664 channel = link->pmp;
3665
3666 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3667 NULL);
3668 if (!IS_ERR(sdev)) {
3669 dev->sdev = sdev;
3670 scsi_device_put(sdev);
3671 if (zpodd_dev_enabled(dev))
3672 dev_pm_qos_expose_flags(
3673 &sdev->sdev_gendev, 0);
3674 } else {
3675 dev->sdev = NULL;
3676 }
3677 }
3678 }
3679
3680 /* If we scanned while EH was in progress or allocation
3681 * failure occurred, scan would have failed silently. Check
3682 * whether all devices are attached.
3683 */
3684 ata_for_each_link(link, ap, EDGE) {
3685 ata_for_each_dev(dev, link, ENABLED) {
3686 if (!dev->sdev)
3687 goto exit_loop;
3688 }
3689 }
3690 exit_loop:
3691 if (!link)
3692 return;
3693
3694 /* we're missing some SCSI devices */
3695 if (sync) {
3696 /* If caller requested synchrnous scan && we've made
3697 * any progress, sleep briefly and repeat.
3698 */
3699 if (dev != last_failed_dev) {
3700 msleep(100);
3701 last_failed_dev = dev;
3702 goto repeat;
3703 }
3704
3705 /* We might be failing to detect boot device, give it
3706 * a few more chances.
3707 */
3708 if (--tries) {
3709 msleep(100);
3710 goto repeat;
3711 }
3712
3713 ata_port_err(ap,
3714 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
3715 }
3716
3717 queue_delayed_work(system_long_wq, &ap->hotplug_task,
3718 round_jiffies_relative(HZ));
3719 }
3720
3721 /**
3722 * ata_scsi_offline_dev - offline attached SCSI device
3723 * @dev: ATA device to offline attached SCSI device for
3724 *
3725 * This function is called from ata_eh_hotplug() and responsible
3726 * for taking the SCSI device attached to @dev offline. This
3727 * function is called with host lock which protects dev->sdev
3728 * against clearing.
3729 *
3730 * LOCKING:
3731 * spin_lock_irqsave(host lock)
3732 *
3733 * RETURNS:
3734 * 1 if attached SCSI device exists, 0 otherwise.
3735 */
3736 int ata_scsi_offline_dev(struct ata_device *dev)
3737 {
3738 if (dev->sdev) {
3739 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3740 return 1;
3741 }
3742 return 0;
3743 }
3744
3745 /**
3746 * ata_scsi_remove_dev - remove attached SCSI device
3747 * @dev: ATA device to remove attached SCSI device for
3748 *
3749 * This function is called from ata_eh_scsi_hotplug() and
3750 * responsible for removing the SCSI device attached to @dev.
3751 *
3752 * LOCKING:
3753 * Kernel thread context (may sleep).
3754 */
3755 static void ata_scsi_remove_dev(struct ata_device *dev)
3756 {
3757 struct ata_port *ap = dev->link->ap;
3758 struct scsi_device *sdev;
3759 unsigned long flags;
3760
3761 /* Alas, we need to grab scan_mutex to ensure SCSI device
3762 * state doesn't change underneath us and thus
3763 * scsi_device_get() always succeeds. The mutex locking can
3764 * be removed if there is __scsi_device_get() interface which
3765 * increments reference counts regardless of device state.
3766 */
3767 mutex_lock(&ap->scsi_host->scan_mutex);
3768 spin_lock_irqsave(ap->lock, flags);
3769
3770 if (zpodd_dev_enabled(dev))
3771 zpodd_exit(dev);
3772
3773 /* clearing dev->sdev is protected by host lock */
3774 sdev = dev->sdev;
3775 dev->sdev = NULL;
3776
3777 if (sdev) {
3778 /* If user initiated unplug races with us, sdev can go
3779 * away underneath us after the host lock and
3780 * scan_mutex are released. Hold onto it.
3781 */
3782 if (scsi_device_get(sdev) == 0) {
3783 /* The following ensures the attached sdev is
3784 * offline on return from ata_scsi_offline_dev()
3785 * regardless it wins or loses the race
3786 * against this function.
3787 */
3788 scsi_device_set_state(sdev, SDEV_OFFLINE);
3789 } else {
3790 WARN_ON(1);
3791 sdev = NULL;
3792 }
3793 }
3794
3795 spin_unlock_irqrestore(ap->lock, flags);
3796 mutex_unlock(&ap->scsi_host->scan_mutex);
3797
3798 if (sdev) {
3799 ata_dev_info(dev, "detaching (SCSI %s)\n",
3800 dev_name(&sdev->sdev_gendev));
3801
3802 scsi_remove_device(sdev);
3803 scsi_device_put(sdev);
3804 }
3805 }
3806
3807 static void ata_scsi_handle_link_detach(struct ata_link *link)
3808 {
3809 struct ata_port *ap = link->ap;
3810 struct ata_device *dev;
3811
3812 ata_for_each_dev(dev, link, ALL) {
3813 unsigned long flags;
3814
3815 if (!(dev->flags & ATA_DFLAG_DETACHED))
3816 continue;
3817
3818 spin_lock_irqsave(ap->lock, flags);
3819 dev->flags &= ~ATA_DFLAG_DETACHED;
3820 spin_unlock_irqrestore(ap->lock, flags);
3821
3822 ata_scsi_remove_dev(dev);
3823 }
3824 }
3825
3826 /**
3827 * ata_scsi_media_change_notify - send media change event
3828 * @dev: Pointer to the disk device with media change event
3829 *
3830 * Tell the block layer to send a media change notification
3831 * event.
3832 *
3833 * LOCKING:
3834 * spin_lock_irqsave(host lock)
3835 */
3836 void ata_scsi_media_change_notify(struct ata_device *dev)
3837 {
3838 if (dev->sdev)
3839 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3840 GFP_ATOMIC);
3841 }
3842
3843 /**
3844 * ata_scsi_hotplug - SCSI part of hotplug
3845 * @work: Pointer to ATA port to perform SCSI hotplug on
3846 *
3847 * Perform SCSI part of hotplug. It's executed from a separate
3848 * workqueue after EH completes. This is necessary because SCSI
3849 * hot plugging requires working EH and hot unplugging is
3850 * synchronized with hot plugging with a mutex.
3851 *
3852 * LOCKING:
3853 * Kernel thread context (may sleep).
3854 */
3855 void ata_scsi_hotplug(struct work_struct *work)
3856 {
3857 struct ata_port *ap =
3858 container_of(work, struct ata_port, hotplug_task.work);
3859 int i;
3860
3861 if (ap->pflags & ATA_PFLAG_UNLOADING) {
3862 DPRINTK("ENTER/EXIT - unloading\n");
3863 return;
3864 }
3865
3866 DPRINTK("ENTER\n");
3867 mutex_lock(&ap->scsi_scan_mutex);
3868
3869 /* Unplug detached devices. We cannot use link iterator here
3870 * because PMP links have to be scanned even if PMP is
3871 * currently not attached. Iterate manually.
3872 */
3873 ata_scsi_handle_link_detach(&ap->link);
3874 if (ap->pmp_link)
3875 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3876 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3877
3878 /* scan for new ones */
3879 ata_scsi_scan_host(ap, 0);
3880
3881 mutex_unlock(&ap->scsi_scan_mutex);
3882 DPRINTK("EXIT\n");
3883 }
3884
3885 /**
3886 * ata_scsi_user_scan - indication for user-initiated bus scan
3887 * @shost: SCSI host to scan
3888 * @channel: Channel to scan
3889 * @id: ID to scan
3890 * @lun: LUN to scan
3891 *
3892 * This function is called when user explicitly requests bus
3893 * scan. Set probe pending flag and invoke EH.
3894 *
3895 * LOCKING:
3896 * SCSI layer (we don't care)
3897 *
3898 * RETURNS:
3899 * Zero.
3900 */
3901 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3902 unsigned int id, unsigned int lun)
3903 {
3904 struct ata_port *ap = ata_shost_to_port(shost);
3905 unsigned long flags;
3906 int devno, rc = 0;
3907
3908 if (!ap->ops->error_handler)
3909 return -EOPNOTSUPP;
3910
3911 if (lun != SCAN_WILD_CARD && lun)
3912 return -EINVAL;
3913
3914 if (!sata_pmp_attached(ap)) {
3915 if (channel != SCAN_WILD_CARD && channel)
3916 return -EINVAL;
3917 devno = id;
3918 } else {
3919 if (id != SCAN_WILD_CARD && id)
3920 return -EINVAL;
3921 devno = channel;
3922 }
3923
3924 spin_lock_irqsave(ap->lock, flags);
3925
3926 if (devno == SCAN_WILD_CARD) {
3927 struct ata_link *link;
3928
3929 ata_for_each_link(link, ap, EDGE) {
3930 struct ata_eh_info *ehi = &link->eh_info;
3931 ehi->probe_mask |= ATA_ALL_DEVICES;
3932 ehi->action |= ATA_EH_RESET;
3933 }
3934 } else {
3935 struct ata_device *dev = ata_find_dev(ap, devno);
3936
3937 if (dev) {
3938 struct ata_eh_info *ehi = &dev->link->eh_info;
3939 ehi->probe_mask |= 1 << dev->devno;
3940 ehi->action |= ATA_EH_RESET;
3941 } else
3942 rc = -EINVAL;
3943 }
3944
3945 if (rc == 0) {
3946 ata_port_schedule_eh(ap);
3947 spin_unlock_irqrestore(ap->lock, flags);
3948 ata_port_wait_eh(ap);
3949 } else
3950 spin_unlock_irqrestore(ap->lock, flags);
3951
3952 return rc;
3953 }
3954
3955 /**
3956 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3957 * @work: Pointer to ATA port to perform scsi_rescan_device()
3958 *
3959 * After ATA pass thru (SAT) commands are executed successfully,
3960 * libata need to propagate the changes to SCSI layer.
3961 *
3962 * LOCKING:
3963 * Kernel thread context (may sleep).
3964 */
3965 void ata_scsi_dev_rescan(struct work_struct *work)
3966 {
3967 struct ata_port *ap =
3968 container_of(work, struct ata_port, scsi_rescan_task);
3969 struct ata_link *link;
3970 struct ata_device *dev;
3971 unsigned long flags;
3972
3973 mutex_lock(&ap->scsi_scan_mutex);
3974 spin_lock_irqsave(ap->lock, flags);
3975
3976 ata_for_each_link(link, ap, EDGE) {
3977 ata_for_each_dev(dev, link, ENABLED) {
3978 struct scsi_device *sdev = dev->sdev;
3979
3980 if (!sdev)
3981 continue;
3982 if (scsi_device_get(sdev))
3983 continue;
3984
3985 spin_unlock_irqrestore(ap->lock, flags);
3986 scsi_rescan_device(&(sdev->sdev_gendev));
3987 scsi_device_put(sdev);
3988 spin_lock_irqsave(ap->lock, flags);
3989 }
3990 }
3991
3992 spin_unlock_irqrestore(ap->lock, flags);
3993 mutex_unlock(&ap->scsi_scan_mutex);
3994 }
3995
3996 /**
3997 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3998 * @host: ATA host container for all SAS ports
3999 * @port_info: Information from low-level host driver
4000 * @shost: SCSI host that the scsi device is attached to
4001 *
4002 * LOCKING:
4003 * PCI/etc. bus probe sem.
4004 *
4005 * RETURNS:
4006 * ata_port pointer on success / NULL on failure.
4007 */
4008
4009 struct ata_port *ata_sas_port_alloc(struct ata_host *host,
4010 struct ata_port_info *port_info,
4011 struct Scsi_Host *shost)
4012 {
4013 struct ata_port *ap;
4014
4015 ap = ata_port_alloc(host);
4016 if (!ap)
4017 return NULL;
4018
4019 ap->port_no = 0;
4020 ap->lock = &host->lock;
4021 ap->pio_mask = port_info->pio_mask;
4022 ap->mwdma_mask = port_info->mwdma_mask;
4023 ap->udma_mask = port_info->udma_mask;
4024 ap->flags |= port_info->flags;
4025 ap->ops = port_info->port_ops;
4026 ap->cbl = ATA_CBL_SATA;
4027
4028 return ap;
4029 }
4030 EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
4031
4032 /**
4033 * ata_sas_port_start - Set port up for dma.
4034 * @ap: Port to initialize
4035 *
4036 * Called just after data structures for each port are
4037 * initialized.
4038 *
4039 * May be used as the port_start() entry in ata_port_operations.
4040 *
4041 * LOCKING:
4042 * Inherited from caller.
4043 */
4044 int ata_sas_port_start(struct ata_port *ap)
4045 {
4046 /*
4047 * the port is marked as frozen at allocation time, but if we don't
4048 * have new eh, we won't thaw it
4049 */
4050 if (!ap->ops->error_handler)
4051 ap->pflags &= ~ATA_PFLAG_FROZEN;
4052 return 0;
4053 }
4054 EXPORT_SYMBOL_GPL(ata_sas_port_start);
4055
4056 /**
4057 * ata_port_stop - Undo ata_sas_port_start()
4058 * @ap: Port to shut down
4059 *
4060 * May be used as the port_stop() entry in ata_port_operations.
4061 *
4062 * LOCKING:
4063 * Inherited from caller.
4064 */
4065
4066 void ata_sas_port_stop(struct ata_port *ap)
4067 {
4068 }
4069 EXPORT_SYMBOL_GPL(ata_sas_port_stop);
4070
4071 /**
4072 * ata_sas_async_probe - simply schedule probing and return
4073 * @ap: Port to probe
4074 *
4075 * For batch scheduling of probe for sas attached ata devices, assumes
4076 * the port has already been through ata_sas_port_init()
4077 */
4078 void ata_sas_async_probe(struct ata_port *ap)
4079 {
4080 __ata_port_probe(ap);
4081 }
4082 EXPORT_SYMBOL_GPL(ata_sas_async_probe);
4083
4084 int ata_sas_sync_probe(struct ata_port *ap)
4085 {
4086 return ata_port_probe(ap);
4087 }
4088 EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
4089
4090
4091 /**
4092 * ata_sas_port_init - Initialize a SATA device
4093 * @ap: SATA port to initialize
4094 *
4095 * LOCKING:
4096 * PCI/etc. bus probe sem.
4097 *
4098 * RETURNS:
4099 * Zero on success, non-zero on error.
4100 */
4101
4102 int ata_sas_port_init(struct ata_port *ap)
4103 {
4104 int rc = ap->ops->port_start(ap);
4105
4106 if (rc)
4107 return rc;
4108 ap->print_id = atomic_inc_return(&ata_print_id);
4109 return 0;
4110 }
4111 EXPORT_SYMBOL_GPL(ata_sas_port_init);
4112
4113 /**
4114 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
4115 * @ap: SATA port to destroy
4116 *
4117 */
4118
4119 void ata_sas_port_destroy(struct ata_port *ap)
4120 {
4121 if (ap->ops->port_stop)
4122 ap->ops->port_stop(ap);
4123 kfree(ap);
4124 }
4125 EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
4126
4127 /**
4128 * ata_sas_slave_configure - Default slave_config routine for libata devices
4129 * @sdev: SCSI device to configure
4130 * @ap: ATA port to which SCSI device is attached
4131 *
4132 * RETURNS:
4133 * Zero.
4134 */
4135
4136 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
4137 {
4138 ata_scsi_sdev_config(sdev);
4139 ata_scsi_dev_config(sdev, ap->link.device);
4140 return 0;
4141 }
4142 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
4143
4144 /**
4145 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
4146 * @cmd: SCSI command to be sent
4147 * @ap: ATA port to which the command is being sent
4148 *
4149 * RETURNS:
4150 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4151 * 0 otherwise.
4152 */
4153
4154 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
4155 {
4156 int rc = 0;
4157
4158 ata_scsi_dump_cdb(ap, cmd);
4159
4160 if (likely(ata_dev_enabled(ap->link.device)))
4161 rc = __ata_scsi_queuecmd(cmd, ap->link.device);
4162 else {
4163 cmd->result = (DID_BAD_TARGET << 16);
4164 cmd->scsi_done(cmd);
4165 }
4166 return rc;
4167 }
4168 EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
kernel source for telekom puls (alcatel/mediatek)