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[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 *device,
116 struct device_attribute *attr,
117 const char *buf, size_t count)
118 {
119 struct Scsi_Host *shost = class_to_shost(device);
120 struct ata_port *ap = ata_shost_to_port(shost);
121 struct ata_link *link;
122 struct ata_device *dev;
123 enum ata_lpm_policy policy;
124 unsigned long flags;
125
126 /* UNKNOWN is internal state, iterate from MAX_POWER */
127 for (policy = ATA_LPM_MAX_POWER;
128 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
129 const char *name = ata_lpm_policy_names[policy];
130
131 if (strncmp(name, buf, strlen(name)) == 0)
132 break;
133 }
134 if (policy == ARRAY_SIZE(ata_lpm_policy_names))
135 return -EINVAL;
136
137 spin_lock_irqsave(ap->lock, flags);
138
139 ata_for_each_link(link, ap, EDGE) {
140 ata_for_each_dev(dev, &ap->link, ENABLED) {
141 if (dev->horkage & ATA_HORKAGE_NOLPM) {
142 count = -EOPNOTSUPP;
143 goto out_unlock;
144 }
145 }
146 }
147
148 ap->target_lpm_policy = policy;
149 ata_port_schedule_eh(ap);
150 out_unlock:
151 spin_unlock_irqrestore(ap->lock, flags);
152 return count;
153 }
154
155 static ssize_t ata_scsi_lpm_show(struct device *dev,
156 struct device_attribute *attr, char *buf)
157 {
158 struct Scsi_Host *shost = class_to_shost(dev);
159 struct ata_port *ap = ata_shost_to_port(shost);
160
161 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
162 return -EINVAL;
163
164 return snprintf(buf, PAGE_SIZE, "%s\n",
165 ata_lpm_policy_names[ap->target_lpm_policy]);
166 }
167 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
168 ata_scsi_lpm_show, ata_scsi_lpm_store);
169 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
170
171 static ssize_t ata_scsi_park_show(struct device *device,
172 struct device_attribute *attr, char *buf)
173 {
174 struct scsi_device *sdev = to_scsi_device(device);
175 struct ata_port *ap;
176 struct ata_link *link;
177 struct ata_device *dev;
178 unsigned long flags, now;
179 unsigned int uninitialized_var(msecs);
180 int rc = 0;
181
182 ap = ata_shost_to_port(sdev->host);
183
184 spin_lock_irqsave(ap->lock, flags);
185 dev = ata_scsi_find_dev(ap, sdev);
186 if (!dev) {
187 rc = -ENODEV;
188 goto unlock;
189 }
190 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
191 rc = -EOPNOTSUPP;
192 goto unlock;
193 }
194
195 link = dev->link;
196 now = jiffies;
197 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
198 link->eh_context.unloaded_mask & (1 << dev->devno) &&
199 time_after(dev->unpark_deadline, now))
200 msecs = jiffies_to_msecs(dev->unpark_deadline - now);
201 else
202 msecs = 0;
203
204 unlock:
205 spin_unlock_irq(ap->lock);
206
207 return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
208 }
209
210 static ssize_t ata_scsi_park_store(struct device *device,
211 struct device_attribute *attr,
212 const char *buf, size_t len)
213 {
214 struct scsi_device *sdev = to_scsi_device(device);
215 struct ata_port *ap;
216 struct ata_device *dev;
217 long int input;
218 unsigned long flags;
219 int rc;
220
221 rc = strict_strtol(buf, 10, &input);
222 if (rc || input < -2)
223 return -EINVAL;
224 if (input > ATA_TMOUT_MAX_PARK) {
225 rc = -EOVERFLOW;
226 input = ATA_TMOUT_MAX_PARK;
227 }
228
229 ap = ata_shost_to_port(sdev->host);
230
231 spin_lock_irqsave(ap->lock, flags);
232 dev = ata_scsi_find_dev(ap, sdev);
233 if (unlikely(!dev)) {
234 rc = -ENODEV;
235 goto unlock;
236 }
237 if (dev->class != ATA_DEV_ATA) {
238 rc = -EOPNOTSUPP;
239 goto unlock;
240 }
241
242 if (input >= 0) {
243 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
244 rc = -EOPNOTSUPP;
245 goto unlock;
246 }
247
248 dev->unpark_deadline = ata_deadline(jiffies, input);
249 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
250 ata_port_schedule_eh(ap);
251 complete(&ap->park_req_pending);
252 } else {
253 switch (input) {
254 case -1:
255 dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
256 break;
257 case -2:
258 dev->flags |= ATA_DFLAG_NO_UNLOAD;
259 break;
260 }
261 }
262 unlock:
263 spin_unlock_irqrestore(ap->lock, flags);
264
265 return rc ? rc : len;
266 }
267 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
268 ata_scsi_park_show, ata_scsi_park_store);
269 EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
270
271 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
272 {
273 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
274
275 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
276 }
277
278 static ssize_t
279 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
280 const char *buf, size_t count)
281 {
282 struct Scsi_Host *shost = class_to_shost(dev);
283 struct ata_port *ap = ata_shost_to_port(shost);
284 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
285 return ap->ops->em_store(ap, buf, count);
286 return -EINVAL;
287 }
288
289 static ssize_t
290 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
291 char *buf)
292 {
293 struct Scsi_Host *shost = class_to_shost(dev);
294 struct ata_port *ap = ata_shost_to_port(shost);
295
296 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
297 return ap->ops->em_show(ap, buf);
298 return -EINVAL;
299 }
300 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
301 ata_scsi_em_message_show, ata_scsi_em_message_store);
302 EXPORT_SYMBOL_GPL(dev_attr_em_message);
303
304 static ssize_t
305 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
306 char *buf)
307 {
308 struct Scsi_Host *shost = class_to_shost(dev);
309 struct ata_port *ap = ata_shost_to_port(shost);
310
311 return snprintf(buf, 23, "%d\n", ap->em_message_type);
312 }
313 DEVICE_ATTR(em_message_type, S_IRUGO,
314 ata_scsi_em_message_type_show, NULL);
315 EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
316
317 static ssize_t
318 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
319 char *buf)
320 {
321 struct scsi_device *sdev = to_scsi_device(dev);
322 struct ata_port *ap = ata_shost_to_port(sdev->host);
323 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
324
325 if (atadev && ap->ops->sw_activity_show &&
326 (ap->flags & ATA_FLAG_SW_ACTIVITY))
327 return ap->ops->sw_activity_show(atadev, buf);
328 return -EINVAL;
329 }
330
331 static ssize_t
332 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
333 const char *buf, size_t count)
334 {
335 struct scsi_device *sdev = to_scsi_device(dev);
336 struct ata_port *ap = ata_shost_to_port(sdev->host);
337 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
338 enum sw_activity val;
339 int rc;
340
341 if (atadev && ap->ops->sw_activity_store &&
342 (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
343 val = simple_strtoul(buf, NULL, 0);
344 switch (val) {
345 case OFF: case BLINK_ON: case BLINK_OFF:
346 rc = ap->ops->sw_activity_store(atadev, val);
347 if (!rc)
348 return count;
349 else
350 return rc;
351 }
352 }
353 return -EINVAL;
354 }
355 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
356 ata_scsi_activity_store);
357 EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
358
359 struct device_attribute *ata_common_sdev_attrs[] = {
360 &dev_attr_unload_heads,
361 NULL
362 };
363 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
364
365 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd)
366 {
367 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
368 /* "Invalid field in cbd" */
369 cmd->scsi_done(cmd);
370 }
371
372 /**
373 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
374 * @sdev: SCSI device for which BIOS geometry is to be determined
375 * @bdev: block device associated with @sdev
376 * @capacity: capacity of SCSI device
377 * @geom: location to which geometry will be output
378 *
379 * Generic bios head/sector/cylinder calculator
380 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
381 * mapping. Some situations may arise where the disk is not
382 * bootable if this is not used.
383 *
384 * LOCKING:
385 * Defined by the SCSI layer. We don't really care.
386 *
387 * RETURNS:
388 * Zero.
389 */
390 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
391 sector_t capacity, int geom[])
392 {
393 geom[0] = 255;
394 geom[1] = 63;
395 sector_div(capacity, 255*63);
396 geom[2] = capacity;
397
398 return 0;
399 }
400
401 /**
402 * ata_scsi_unlock_native_capacity - unlock native capacity
403 * @sdev: SCSI device to adjust device capacity for
404 *
405 * This function is called if a partition on @sdev extends beyond
406 * the end of the device. It requests EH to unlock HPA.
407 *
408 * LOCKING:
409 * Defined by the SCSI layer. Might sleep.
410 */
411 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
412 {
413 struct ata_port *ap = ata_shost_to_port(sdev->host);
414 struct ata_device *dev;
415 unsigned long flags;
416
417 spin_lock_irqsave(ap->lock, flags);
418
419 dev = ata_scsi_find_dev(ap, sdev);
420 if (dev && dev->n_sectors < dev->n_native_sectors) {
421 dev->flags |= ATA_DFLAG_UNLOCK_HPA;
422 dev->link->eh_info.action |= ATA_EH_RESET;
423 ata_port_schedule_eh(ap);
424 }
425
426 spin_unlock_irqrestore(ap->lock, flags);
427 ata_port_wait_eh(ap);
428 }
429
430 /**
431 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
432 * @ap: target port
433 * @sdev: SCSI device to get identify data for
434 * @arg: User buffer area for identify data
435 *
436 * LOCKING:
437 * Defined by the SCSI layer. We don't really care.
438 *
439 * RETURNS:
440 * Zero on success, negative errno on error.
441 */
442 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
443 void __user *arg)
444 {
445 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
446 u16 __user *dst = arg;
447 char buf[40];
448
449 if (!dev)
450 return -ENOMSG;
451
452 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
453 return -EFAULT;
454
455 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
456 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
457 return -EFAULT;
458
459 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
460 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
461 return -EFAULT;
462
463 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
464 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
465 return -EFAULT;
466
467 return 0;
468 }
469
470 /**
471 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
472 * @scsidev: Device to which we are issuing command
473 * @arg: User provided data for issuing command
474 *
475 * LOCKING:
476 * Defined by the SCSI layer. We don't really care.
477 *
478 * RETURNS:
479 * Zero on success, negative errno on error.
480 */
481 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
482 {
483 int rc = 0;
484 u8 scsi_cmd[MAX_COMMAND_SIZE];
485 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
486 int argsize = 0;
487 enum dma_data_direction data_dir;
488 int cmd_result;
489
490 if (arg == NULL)
491 return -EINVAL;
492
493 if (copy_from_user(args, arg, sizeof(args)))
494 return -EFAULT;
495
496 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
497 if (!sensebuf)
498 return -ENOMEM;
499
500 memset(scsi_cmd, 0, sizeof(scsi_cmd));
501
502 if (args[3]) {
503 argsize = ATA_SECT_SIZE * args[3];
504 argbuf = kmalloc(argsize, GFP_KERNEL);
505 if (argbuf == NULL) {
506 rc = -ENOMEM;
507 goto error;
508 }
509
510 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
511 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
512 block count in sector count field */
513 data_dir = DMA_FROM_DEVICE;
514 } else {
515 scsi_cmd[1] = (3 << 1); /* Non-data */
516 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
517 data_dir = DMA_NONE;
518 }
519
520 scsi_cmd[0] = ATA_16;
521
522 scsi_cmd[4] = args[2];
523 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
524 scsi_cmd[6] = args[3];
525 scsi_cmd[8] = args[1];
526 scsi_cmd[10] = 0x4f;
527 scsi_cmd[12] = 0xc2;
528 } else {
529 scsi_cmd[6] = args[1];
530 }
531 scsi_cmd[14] = args[0];
532
533 /* Good values for timeout and retries? Values below
534 from scsi_ioctl_send_command() for default case... */
535 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
536 sensebuf, (10*HZ), 5, 0, NULL);
537
538 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
539 u8 *desc = sensebuf + 8;
540 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
541
542 /* If we set cc then ATA pass-through will cause a
543 * check condition even if no error. Filter that. */
544 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
545 struct scsi_sense_hdr sshdr;
546 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
547 &sshdr);
548 if (sshdr.sense_key == RECOVERED_ERROR &&
549 sshdr.asc == 0 && sshdr.ascq == 0x1d)
550 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
551 }
552
553 /* Send userspace a few ATA registers (same as drivers/ide) */
554 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
555 desc[0] == 0x09) { /* code is "ATA Descriptor" */
556 args[0] = desc[13]; /* status */
557 args[1] = desc[3]; /* error */
558 args[2] = desc[5]; /* sector count (0:7) */
559 if (copy_to_user(arg, args, sizeof(args)))
560 rc = -EFAULT;
561 }
562 }
563
564
565 if (cmd_result) {
566 rc = -EIO;
567 goto error;
568 }
569
570 if ((argbuf)
571 && copy_to_user(arg + sizeof(args), argbuf, argsize))
572 rc = -EFAULT;
573 error:
574 kfree(sensebuf);
575 kfree(argbuf);
576 return rc;
577 }
578
579 /**
580 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
581 * @scsidev: Device to which we are issuing command
582 * @arg: User provided data for issuing command
583 *
584 * LOCKING:
585 * Defined by the SCSI layer. We don't really care.
586 *
587 * RETURNS:
588 * Zero on success, negative errno on error.
589 */
590 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
591 {
592 int rc = 0;
593 u8 scsi_cmd[MAX_COMMAND_SIZE];
594 u8 args[7], *sensebuf = NULL;
595 int cmd_result;
596
597 if (arg == NULL)
598 return -EINVAL;
599
600 if (copy_from_user(args, arg, sizeof(args)))
601 return -EFAULT;
602
603 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
604 if (!sensebuf)
605 return -ENOMEM;
606
607 memset(scsi_cmd, 0, sizeof(scsi_cmd));
608 scsi_cmd[0] = ATA_16;
609 scsi_cmd[1] = (3 << 1); /* Non-data */
610 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
611 scsi_cmd[4] = args[1];
612 scsi_cmd[6] = args[2];
613 scsi_cmd[8] = args[3];
614 scsi_cmd[10] = args[4];
615 scsi_cmd[12] = args[5];
616 scsi_cmd[13] = args[6] & 0x4f;
617 scsi_cmd[14] = args[0];
618
619 /* Good values for timeout and retries? Values below
620 from scsi_ioctl_send_command() for default case... */
621 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
622 sensebuf, (10*HZ), 5, 0, NULL);
623
624 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
625 u8 *desc = sensebuf + 8;
626 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
627
628 /* If we set cc then ATA pass-through will cause a
629 * check condition even if no error. Filter that. */
630 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
631 struct scsi_sense_hdr sshdr;
632 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
633 &sshdr);
634 if (sshdr.sense_key == RECOVERED_ERROR &&
635 sshdr.asc == 0 && sshdr.ascq == 0x1d)
636 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
637 }
638
639 /* Send userspace ATA registers */
640 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
641 desc[0] == 0x09) {/* code is "ATA Descriptor" */
642 args[0] = desc[13]; /* status */
643 args[1] = desc[3]; /* error */
644 args[2] = desc[5]; /* sector count (0:7) */
645 args[3] = desc[7]; /* lbal */
646 args[4] = desc[9]; /* lbam */
647 args[5] = desc[11]; /* lbah */
648 args[6] = desc[12]; /* select */
649 if (copy_to_user(arg, args, sizeof(args)))
650 rc = -EFAULT;
651 }
652 }
653
654 if (cmd_result) {
655 rc = -EIO;
656 goto error;
657 }
658
659 error:
660 kfree(sensebuf);
661 return rc;
662 }
663
664 static int ata_ioc32(struct ata_port *ap)
665 {
666 if (ap->flags & ATA_FLAG_PIO_DMA)
667 return 1;
668 if (ap->pflags & ATA_PFLAG_PIO32)
669 return 1;
670 return 0;
671 }
672
673 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
674 int cmd, void __user *arg)
675 {
676 int val = -EINVAL, rc = -EINVAL;
677 unsigned long flags;
678
679 switch (cmd) {
680 case ATA_IOC_GET_IO32:
681 spin_lock_irqsave(ap->lock, flags);
682 val = ata_ioc32(ap);
683 spin_unlock_irqrestore(ap->lock, flags);
684 if (copy_to_user(arg, &val, 1))
685 return -EFAULT;
686 return 0;
687
688 case ATA_IOC_SET_IO32:
689 val = (unsigned long) arg;
690 rc = 0;
691 spin_lock_irqsave(ap->lock, flags);
692 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
693 if (val)
694 ap->pflags |= ATA_PFLAG_PIO32;
695 else
696 ap->pflags &= ~ATA_PFLAG_PIO32;
697 } else {
698 if (val != ata_ioc32(ap))
699 rc = -EINVAL;
700 }
701 spin_unlock_irqrestore(ap->lock, flags);
702 return rc;
703
704 case HDIO_GET_IDENTITY:
705 return ata_get_identity(ap, scsidev, arg);
706
707 case HDIO_DRIVE_CMD:
708 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
709 return -EACCES;
710 return ata_cmd_ioctl(scsidev, arg);
711
712 case HDIO_DRIVE_TASK:
713 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
714 return -EACCES;
715 return ata_task_ioctl(scsidev, arg);
716
717 default:
718 rc = -ENOTTY;
719 break;
720 }
721
722 return rc;
723 }
724 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
725
726 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
727 {
728 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
729 scsidev, cmd, arg);
730 }
731 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
732
733 /**
734 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
735 * @dev: ATA device to which the new command is attached
736 * @cmd: SCSI command that originated this ATA command
737 *
738 * Obtain a reference to an unused ata_queued_cmd structure,
739 * which is the basic libata structure representing a single
740 * ATA command sent to the hardware.
741 *
742 * If a command was available, fill in the SCSI-specific
743 * portions of the structure with information on the
744 * current command.
745 *
746 * LOCKING:
747 * spin_lock_irqsave(host lock)
748 *
749 * RETURNS:
750 * Command allocated, or %NULL if none available.
751 */
752 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
753 struct scsi_cmnd *cmd)
754 {
755 struct ata_queued_cmd *qc;
756
757 qc = ata_qc_new_init(dev);
758 if (qc) {
759 qc->scsicmd = cmd;
760 qc->scsidone = cmd->scsi_done;
761
762 qc->sg = scsi_sglist(cmd);
763 qc->n_elem = scsi_sg_count(cmd);
764 } else {
765 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
766 cmd->scsi_done(cmd);
767 }
768
769 return qc;
770 }
771
772 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
773 {
774 struct scsi_cmnd *scmd = qc->scsicmd;
775
776 qc->extrabytes = scmd->request->extra_len;
777 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
778 }
779
780 /**
781 * ata_dump_status - user friendly display of error info
782 * @id: id of the port in question
783 * @tf: ptr to filled out taskfile
784 *
785 * Decode and dump the ATA error/status registers for the user so
786 * that they have some idea what really happened at the non
787 * make-believe layer.
788 *
789 * LOCKING:
790 * inherited from caller
791 */
792 static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
793 {
794 u8 stat = tf->command, err = tf->feature;
795
796 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
797 if (stat & ATA_BUSY) {
798 printk("Busy }\n"); /* Data is not valid in this case */
799 } else {
800 if (stat & 0x40) printk("DriveReady ");
801 if (stat & 0x20) printk("DeviceFault ");
802 if (stat & 0x10) printk("SeekComplete ");
803 if (stat & 0x08) printk("DataRequest ");
804 if (stat & 0x04) printk("CorrectedError ");
805 if (stat & 0x02) printk("Index ");
806 if (stat & 0x01) printk("Error ");
807 printk("}\n");
808
809 if (err) {
810 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
811 if (err & 0x04) printk("DriveStatusError ");
812 if (err & 0x80) {
813 if (err & 0x04) printk("BadCRC ");
814 else printk("Sector ");
815 }
816 if (err & 0x40) printk("UncorrectableError ");
817 if (err & 0x10) printk("SectorIdNotFound ");
818 if (err & 0x02) printk("TrackZeroNotFound ");
819 if (err & 0x01) printk("AddrMarkNotFound ");
820 printk("}\n");
821 }
822 }
823 }
824
825 /**
826 * ata_to_sense_error - convert ATA error to SCSI error
827 * @id: ATA device number
828 * @drv_stat: value contained in ATA status register
829 * @drv_err: value contained in ATA error register
830 * @sk: the sense key we'll fill out
831 * @asc: the additional sense code we'll fill out
832 * @ascq: the additional sense code qualifier we'll fill out
833 * @verbose: be verbose
834 *
835 * Converts an ATA error into a SCSI error. Fill out pointers to
836 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
837 * format sense blocks.
838 *
839 * LOCKING:
840 * spin_lock_irqsave(host lock)
841 */
842 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
843 u8 *asc, u8 *ascq, int verbose)
844 {
845 int i;
846
847 /* Based on the 3ware driver translation table */
848 static const unsigned char sense_table[][4] = {
849 /* BBD|ECC|ID|MAR */
850 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
851 /* BBD|ECC|ID */
852 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
853 /* ECC|MC|MARK */
854 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
855 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
856 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
857 /* MC|ID|ABRT|TRK0|MARK */
858 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
859 /* MCR|MARK */
860 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
861 /* Bad address mark */
862 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
863 /* TRK0 */
864 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
865 /* Abort & !ICRC */
866 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
867 /* Media change request */
868 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
869 /* SRV */
870 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
871 /* Media change */
872 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
873 /* ECC */
874 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
875 /* BBD - block marked bad */
876 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
877 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
878 };
879 static const unsigned char stat_table[][4] = {
880 /* Must be first because BUSY means no other bits valid */
881 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
882 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
883 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
884 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
885 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
886 };
887
888 /*
889 * Is this an error we can process/parse
890 */
891 if (drv_stat & ATA_BUSY) {
892 drv_err = 0; /* Ignore the err bits, they're invalid */
893 }
894
895 if (drv_err) {
896 /* Look for drv_err */
897 for (i = 0; sense_table[i][0] != 0xFF; i++) {
898 /* Look for best matches first */
899 if ((sense_table[i][0] & drv_err) ==
900 sense_table[i][0]) {
901 *sk = sense_table[i][1];
902 *asc = sense_table[i][2];
903 *ascq = sense_table[i][3];
904 goto translate_done;
905 }
906 }
907 /* No immediate match */
908 if (verbose)
909 printk(KERN_WARNING "ata%u: no sense translation for "
910 "error 0x%02x\n", id, drv_err);
911 }
912
913 /* Fall back to interpreting status bits */
914 for (i = 0; stat_table[i][0] != 0xFF; i++) {
915 if (stat_table[i][0] & drv_stat) {
916 *sk = stat_table[i][1];
917 *asc = stat_table[i][2];
918 *ascq = stat_table[i][3];
919 goto translate_done;
920 }
921 }
922 /* No error? Undecoded? */
923 if (verbose)
924 printk(KERN_WARNING "ata%u: no sense translation for "
925 "status: 0x%02x\n", id, drv_stat);
926
927 /* We need a sensible error return here, which is tricky, and one
928 that won't cause people to do things like return a disk wrongly */
929 *sk = ABORTED_COMMAND;
930 *asc = 0x00;
931 *ascq = 0x00;
932
933 translate_done:
934 if (verbose)
935 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
936 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
937 id, drv_stat, drv_err, *sk, *asc, *ascq);
938 return;
939 }
940
941 /*
942 * ata_gen_passthru_sense - Generate check condition sense block.
943 * @qc: Command that completed.
944 *
945 * This function is specific to the ATA descriptor format sense
946 * block specified for the ATA pass through commands. Regardless
947 * of whether the command errored or not, return a sense
948 * block. Copy all controller registers into the sense
949 * block. If there was no error, we get the request from an ATA
950 * passthrough command, so we use the following sense data:
951 * sk = RECOVERED ERROR
952 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
953 *
954 *
955 * LOCKING:
956 * None.
957 */
958 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
959 {
960 struct scsi_cmnd *cmd = qc->scsicmd;
961 struct ata_taskfile *tf = &qc->result_tf;
962 unsigned char *sb = cmd->sense_buffer;
963 unsigned char *desc = sb + 8;
964 int verbose = qc->ap->ops->error_handler == NULL;
965
966 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
967
968 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
969
970 /*
971 * Use ata_to_sense_error() to map status register bits
972 * onto sense key, asc & ascq.
973 */
974 if (qc->err_mask ||
975 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
976 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
977 &sb[1], &sb[2], &sb[3], verbose);
978 sb[1] &= 0x0f;
979 } else {
980 sb[1] = RECOVERED_ERROR;
981 sb[2] = 0;
982 sb[3] = 0x1D;
983 }
984
985 /*
986 * Sense data is current and format is descriptor.
987 */
988 sb[0] = 0x72;
989
990 desc[0] = 0x09;
991
992 /* set length of additional sense data */
993 sb[7] = 14;
994 desc[1] = 12;
995
996 /*
997 * Copy registers into sense buffer.
998 */
999 desc[2] = 0x00;
1000 desc[3] = tf->feature; /* == error reg */
1001 desc[5] = tf->nsect;
1002 desc[7] = tf->lbal;
1003 desc[9] = tf->lbam;
1004 desc[11] = tf->lbah;
1005 desc[12] = tf->device;
1006 desc[13] = tf->command; /* == status reg */
1007
1008 /*
1009 * Fill in Extend bit, and the high order bytes
1010 * if applicable.
1011 */
1012 if (tf->flags & ATA_TFLAG_LBA48) {
1013 desc[2] |= 0x01;
1014 desc[4] = tf->hob_nsect;
1015 desc[6] = tf->hob_lbal;
1016 desc[8] = tf->hob_lbam;
1017 desc[10] = tf->hob_lbah;
1018 }
1019 }
1020
1021 /**
1022 * ata_gen_ata_sense - generate a SCSI fixed sense block
1023 * @qc: Command that we are erroring out
1024 *
1025 * Generate sense block for a failed ATA command @qc. Descriptor
1026 * format is used to accommodate LBA48 block address.
1027 *
1028 * LOCKING:
1029 * None.
1030 */
1031 static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
1032 {
1033 struct ata_device *dev = qc->dev;
1034 struct scsi_cmnd *cmd = qc->scsicmd;
1035 struct ata_taskfile *tf = &qc->result_tf;
1036 unsigned char *sb = cmd->sense_buffer;
1037 unsigned char *desc = sb + 8;
1038 int verbose = qc->ap->ops->error_handler == NULL;
1039 u64 block;
1040
1041 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1042
1043 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
1044
1045 /* sense data is current and format is descriptor */
1046 sb[0] = 0x72;
1047
1048 /* Use ata_to_sense_error() to map status register bits
1049 * onto sense key, asc & ascq.
1050 */
1051 if (qc->err_mask ||
1052 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
1053 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
1054 &sb[1], &sb[2], &sb[3], verbose);
1055 sb[1] &= 0x0f;
1056 }
1057
1058 block = ata_tf_read_block(&qc->result_tf, dev);
1059
1060 /* information sense data descriptor */
1061 sb[7] = 12;
1062 desc[0] = 0x00;
1063 desc[1] = 10;
1064
1065 desc[2] |= 0x80; /* valid */
1066 desc[6] = block >> 40;
1067 desc[7] = block >> 32;
1068 desc[8] = block >> 24;
1069 desc[9] = block >> 16;
1070 desc[10] = block >> 8;
1071 desc[11] = block;
1072 }
1073
1074 static void ata_scsi_sdev_config(struct scsi_device *sdev)
1075 {
1076 sdev->use_10_for_rw = 1;
1077 sdev->use_10_for_ms = 1;
1078 sdev->no_report_opcodes = 1;
1079 sdev->no_write_same = 1;
1080
1081 /* Schedule policy is determined by ->qc_defer() callback and
1082 * it needs to see every deferred qc. Set dev_blocked to 1 to
1083 * prevent SCSI midlayer from automatically deferring
1084 * requests.
1085 */
1086 sdev->max_device_blocked = 1;
1087 }
1088
1089 /**
1090 * atapi_drain_needed - Check whether data transfer may overflow
1091 * @rq: request to be checked
1092 *
1093 * ATAPI commands which transfer variable length data to host
1094 * might overflow due to application error or hardare bug. This
1095 * function checks whether overflow should be drained and ignored
1096 * for @request.
1097 *
1098 * LOCKING:
1099 * None.
1100 *
1101 * RETURNS:
1102 * 1 if ; otherwise, 0.
1103 */
1104 static int atapi_drain_needed(struct request *rq)
1105 {
1106 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
1107 return 0;
1108
1109 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
1110 return 0;
1111
1112 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1113 }
1114
1115 static int ata_scsi_dev_config(struct scsi_device *sdev,
1116 struct ata_device *dev)
1117 {
1118 struct request_queue *q = sdev->request_queue;
1119
1120 if (!ata_id_has_unload(dev->id))
1121 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1122
1123 /* configure max sectors */
1124 blk_queue_max_hw_sectors(q, dev->max_sectors);
1125
1126 if (dev->class == ATA_DEV_ATAPI) {
1127 void *buf;
1128
1129 sdev->sector_size = ATA_SECT_SIZE;
1130
1131 /* set DMA padding */
1132 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
1133
1134 /* configure draining */
1135 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1136 if (!buf) {
1137 ata_dev_err(dev, "drain buffer allocation failed\n");
1138 return -ENOMEM;
1139 }
1140
1141 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1142 } else {
1143 sdev->sector_size = ata_id_logical_sector_size(dev->id);
1144 sdev->manage_start_stop = 1;
1145 }
1146
1147 /*
1148 * ata_pio_sectors() expects buffer for each sector to not cross
1149 * page boundary. Enforce it by requiring buffers to be sector
1150 * aligned, which works iff sector_size is not larger than
1151 * PAGE_SIZE. ATAPI devices also need the alignment as
1152 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1153 */
1154 if (sdev->sector_size > PAGE_SIZE)
1155 ata_dev_warn(dev,
1156 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1157 sdev->sector_size);
1158
1159 blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
1160
1161 if (dev->flags & ATA_DFLAG_AN)
1162 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1163
1164 if (dev->flags & ATA_DFLAG_NCQ) {
1165 int depth;
1166
1167 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1168 depth = min(ATA_MAX_QUEUE - 1, depth);
1169 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
1170 }
1171
1172 blk_queue_flush_queueable(q, false);
1173
1174 dev->sdev = sdev;
1175 return 0;
1176 }
1177
1178 /**
1179 * ata_scsi_slave_config - Set SCSI device attributes
1180 * @sdev: SCSI device to examine
1181 *
1182 * This is called before we actually start reading
1183 * and writing to the device, to configure certain
1184 * SCSI mid-layer behaviors.
1185 *
1186 * LOCKING:
1187 * Defined by SCSI layer. We don't really care.
1188 */
1189
1190 int ata_scsi_slave_config(struct scsi_device *sdev)
1191 {
1192 struct ata_port *ap = ata_shost_to_port(sdev->host);
1193 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1194 int rc = 0;
1195
1196 ata_scsi_sdev_config(sdev);
1197
1198 if (dev)
1199 rc = ata_scsi_dev_config(sdev, dev);
1200
1201 return rc;
1202 }
1203
1204 /**
1205 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1206 * @sdev: SCSI device to be destroyed
1207 *
1208 * @sdev is about to be destroyed for hot/warm unplugging. If
1209 * this unplugging was initiated by libata as indicated by NULL
1210 * dev->sdev, this function doesn't have to do anything.
1211 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1212 * Clear dev->sdev, schedule the device for ATA detach and invoke
1213 * EH.
1214 *
1215 * LOCKING:
1216 * Defined by SCSI layer. We don't really care.
1217 */
1218 void ata_scsi_slave_destroy(struct scsi_device *sdev)
1219 {
1220 struct ata_port *ap = ata_shost_to_port(sdev->host);
1221 struct request_queue *q = sdev->request_queue;
1222 unsigned long flags;
1223 struct ata_device *dev;
1224
1225 if (!ap->ops->error_handler)
1226 return;
1227
1228 spin_lock_irqsave(ap->lock, flags);
1229 dev = __ata_scsi_find_dev(ap, sdev);
1230 if (dev && dev->sdev) {
1231 /* SCSI device already in CANCEL state, no need to offline it */
1232 dev->sdev = NULL;
1233 dev->flags |= ATA_DFLAG_DETACH;
1234 ata_port_schedule_eh(ap);
1235 }
1236 spin_unlock_irqrestore(ap->lock, flags);
1237
1238 kfree(q->dma_drain_buffer);
1239 q->dma_drain_buffer = NULL;
1240 q->dma_drain_size = 0;
1241 }
1242
1243 /**
1244 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
1245 * @ap: ATA port to which the device change the queue depth
1246 * @sdev: SCSI device to configure queue depth for
1247 * @queue_depth: new queue depth
1248 * @reason: calling context
1249 *
1250 * libsas and libata have different approaches for associating a sdev to
1251 * its ata_port.
1252 *
1253 */
1254 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
1255 int queue_depth, int reason)
1256 {
1257 struct ata_device *dev;
1258 unsigned long flags;
1259
1260 if (reason != SCSI_QDEPTH_DEFAULT)
1261 return -EOPNOTSUPP;
1262
1263 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1264 return sdev->queue_depth;
1265
1266 dev = ata_scsi_find_dev(ap, sdev);
1267 if (!dev || !ata_dev_enabled(dev))
1268 return sdev->queue_depth;
1269
1270 /* NCQ enabled? */
1271 spin_lock_irqsave(ap->lock, flags);
1272 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1273 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1274 dev->flags |= ATA_DFLAG_NCQ_OFF;
1275 queue_depth = 1;
1276 }
1277 spin_unlock_irqrestore(ap->lock, flags);
1278
1279 /* limit and apply queue depth */
1280 queue_depth = min(queue_depth, sdev->host->can_queue);
1281 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1282 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1283
1284 if (sdev->queue_depth == queue_depth)
1285 return -EINVAL;
1286
1287 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
1288 return queue_depth;
1289 }
1290
1291 /**
1292 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1293 * @sdev: SCSI device to configure queue depth for
1294 * @queue_depth: new queue depth
1295 * @reason: calling context
1296 *
1297 * This is libata standard hostt->change_queue_depth callback.
1298 * SCSI will call into this callback when user tries to set queue
1299 * depth via sysfs.
1300 *
1301 * LOCKING:
1302 * SCSI layer (we don't care)
1303 *
1304 * RETURNS:
1305 * Newly configured queue depth.
1306 */
1307 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth,
1308 int reason)
1309 {
1310 struct ata_port *ap = ata_shost_to_port(sdev->host);
1311
1312 return __ata_change_queue_depth(ap, sdev, queue_depth, reason);
1313 }
1314
1315 /**
1316 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1317 * @qc: Storage for translated ATA taskfile
1318 *
1319 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1320 * (to start). Perhaps these commands should be preceded by
1321 * CHECK POWER MODE to see what power mode the device is already in.
1322 * [See SAT revision 5 at www.t10.org]
1323 *
1324 * LOCKING:
1325 * spin_lock_irqsave(host lock)
1326 *
1327 * RETURNS:
1328 * Zero on success, non-zero on error.
1329 */
1330 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1331 {
1332 struct scsi_cmnd *scmd = qc->scsicmd;
1333 struct ata_taskfile *tf = &qc->tf;
1334 const u8 *cdb = scmd->cmnd;
1335
1336 if (scmd->cmd_len < 5)
1337 goto invalid_fld;
1338
1339 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1340 tf->protocol = ATA_PROT_NODATA;
1341 if (cdb[1] & 0x1) {
1342 ; /* ignore IMMED bit, violates sat-r05 */
1343 }
1344 if (cdb[4] & 0x2)
1345 goto invalid_fld; /* LOEJ bit set not supported */
1346 if (((cdb[4] >> 4) & 0xf) != 0)
1347 goto invalid_fld; /* power conditions not supported */
1348
1349 if (cdb[4] & 0x1) {
1350 tf->nsect = 1; /* 1 sector, lba=0 */
1351
1352 if (qc->dev->flags & ATA_DFLAG_LBA) {
1353 tf->flags |= ATA_TFLAG_LBA;
1354
1355 tf->lbah = 0x0;
1356 tf->lbam = 0x0;
1357 tf->lbal = 0x0;
1358 tf->device |= ATA_LBA;
1359 } else {
1360 /* CHS */
1361 tf->lbal = 0x1; /* sect */
1362 tf->lbam = 0x0; /* cyl low */
1363 tf->lbah = 0x0; /* cyl high */
1364 }
1365
1366 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
1367 } else {
1368 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1369 * or S5) causing some drives to spin up and down again.
1370 */
1371 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1372 system_state == SYSTEM_POWER_OFF)
1373 goto skip;
1374
1375 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1376 system_entering_hibernation())
1377 goto skip;
1378
1379 /* Issue ATA STANDBY IMMEDIATE command */
1380 tf->command = ATA_CMD_STANDBYNOW1;
1381 }
1382
1383 /*
1384 * Standby and Idle condition timers could be implemented but that
1385 * would require libata to implement the Power condition mode page
1386 * and allow the user to change it. Changing mode pages requires
1387 * MODE SELECT to be implemented.
1388 */
1389
1390 return 0;
1391
1392 invalid_fld:
1393 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1394 /* "Invalid field in cbd" */
1395 return 1;
1396 skip:
1397 scmd->result = SAM_STAT_GOOD;
1398 return 1;
1399 }
1400
1401
1402 /**
1403 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1404 * @qc: Storage for translated ATA taskfile
1405 *
1406 * Sets up an ATA taskfile to issue FLUSH CACHE or
1407 * FLUSH CACHE EXT.
1408 *
1409 * LOCKING:
1410 * spin_lock_irqsave(host lock)
1411 *
1412 * RETURNS:
1413 * Zero on success, non-zero on error.
1414 */
1415 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1416 {
1417 struct ata_taskfile *tf = &qc->tf;
1418
1419 tf->flags |= ATA_TFLAG_DEVICE;
1420 tf->protocol = ATA_PROT_NODATA;
1421
1422 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1423 tf->command = ATA_CMD_FLUSH_EXT;
1424 else
1425 tf->command = ATA_CMD_FLUSH;
1426
1427 /* flush is critical for IO integrity, consider it an IO command */
1428 qc->flags |= ATA_QCFLAG_IO;
1429
1430 return 0;
1431 }
1432
1433 /**
1434 * scsi_6_lba_len - Get LBA and transfer length
1435 * @cdb: SCSI command to translate
1436 *
1437 * Calculate LBA and transfer length for 6-byte commands.
1438 *
1439 * RETURNS:
1440 * @plba: the LBA
1441 * @plen: the transfer length
1442 */
1443 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1444 {
1445 u64 lba = 0;
1446 u32 len;
1447
1448 VPRINTK("six-byte command\n");
1449
1450 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1451 lba |= ((u64)cdb[2]) << 8;
1452 lba |= ((u64)cdb[3]);
1453
1454 len = cdb[4];
1455
1456 *plba = lba;
1457 *plen = len;
1458 }
1459
1460 /**
1461 * scsi_10_lba_len - Get LBA and transfer length
1462 * @cdb: SCSI command to translate
1463 *
1464 * Calculate LBA and transfer length for 10-byte commands.
1465 *
1466 * RETURNS:
1467 * @plba: the LBA
1468 * @plen: the transfer length
1469 */
1470 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1471 {
1472 u64 lba = 0;
1473 u32 len = 0;
1474
1475 VPRINTK("ten-byte command\n");
1476
1477 lba |= ((u64)cdb[2]) << 24;
1478 lba |= ((u64)cdb[3]) << 16;
1479 lba |= ((u64)cdb[4]) << 8;
1480 lba |= ((u64)cdb[5]);
1481
1482 len |= ((u32)cdb[7]) << 8;
1483 len |= ((u32)cdb[8]);
1484
1485 *plba = lba;
1486 *plen = len;
1487 }
1488
1489 /**
1490 * scsi_16_lba_len - Get LBA and transfer length
1491 * @cdb: SCSI command to translate
1492 *
1493 * Calculate LBA and transfer length for 16-byte commands.
1494 *
1495 * RETURNS:
1496 * @plba: the LBA
1497 * @plen: the transfer length
1498 */
1499 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1500 {
1501 u64 lba = 0;
1502 u32 len = 0;
1503
1504 VPRINTK("sixteen-byte command\n");
1505
1506 lba |= ((u64)cdb[2]) << 56;
1507 lba |= ((u64)cdb[3]) << 48;
1508 lba |= ((u64)cdb[4]) << 40;
1509 lba |= ((u64)cdb[5]) << 32;
1510 lba |= ((u64)cdb[6]) << 24;
1511 lba |= ((u64)cdb[7]) << 16;
1512 lba |= ((u64)cdb[8]) << 8;
1513 lba |= ((u64)cdb[9]);
1514
1515 len |= ((u32)cdb[10]) << 24;
1516 len |= ((u32)cdb[11]) << 16;
1517 len |= ((u32)cdb[12]) << 8;
1518 len |= ((u32)cdb[13]);
1519
1520 *plba = lba;
1521 *plen = len;
1522 }
1523
1524 /**
1525 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1526 * @qc: Storage for translated ATA taskfile
1527 *
1528 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1529 *
1530 * LOCKING:
1531 * spin_lock_irqsave(host lock)
1532 *
1533 * RETURNS:
1534 * Zero on success, non-zero on error.
1535 */
1536 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1537 {
1538 struct scsi_cmnd *scmd = qc->scsicmd;
1539 struct ata_taskfile *tf = &qc->tf;
1540 struct ata_device *dev = qc->dev;
1541 u64 dev_sectors = qc->dev->n_sectors;
1542 const u8 *cdb = scmd->cmnd;
1543 u64 block;
1544 u32 n_block;
1545
1546 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1547 tf->protocol = ATA_PROT_NODATA;
1548
1549 if (cdb[0] == VERIFY) {
1550 if (scmd->cmd_len < 10)
1551 goto invalid_fld;
1552 scsi_10_lba_len(cdb, &block, &n_block);
1553 } else if (cdb[0] == VERIFY_16) {
1554 if (scmd->cmd_len < 16)
1555 goto invalid_fld;
1556 scsi_16_lba_len(cdb, &block, &n_block);
1557 } else
1558 goto invalid_fld;
1559
1560 if (!n_block)
1561 goto nothing_to_do;
1562 if (block >= dev_sectors)
1563 goto out_of_range;
1564 if ((block + n_block) > dev_sectors)
1565 goto out_of_range;
1566
1567 if (dev->flags & ATA_DFLAG_LBA) {
1568 tf->flags |= ATA_TFLAG_LBA;
1569
1570 if (lba_28_ok(block, n_block)) {
1571 /* use LBA28 */
1572 tf->command = ATA_CMD_VERIFY;
1573 tf->device |= (block >> 24) & 0xf;
1574 } else if (lba_48_ok(block, n_block)) {
1575 if (!(dev->flags & ATA_DFLAG_LBA48))
1576 goto out_of_range;
1577
1578 /* use LBA48 */
1579 tf->flags |= ATA_TFLAG_LBA48;
1580 tf->command = ATA_CMD_VERIFY_EXT;
1581
1582 tf->hob_nsect = (n_block >> 8) & 0xff;
1583
1584 tf->hob_lbah = (block >> 40) & 0xff;
1585 tf->hob_lbam = (block >> 32) & 0xff;
1586 tf->hob_lbal = (block >> 24) & 0xff;
1587 } else
1588 /* request too large even for LBA48 */
1589 goto out_of_range;
1590
1591 tf->nsect = n_block & 0xff;
1592
1593 tf->lbah = (block >> 16) & 0xff;
1594 tf->lbam = (block >> 8) & 0xff;
1595 tf->lbal = block & 0xff;
1596
1597 tf->device |= ATA_LBA;
1598 } else {
1599 /* CHS */
1600 u32 sect, head, cyl, track;
1601
1602 if (!lba_28_ok(block, n_block))
1603 goto out_of_range;
1604
1605 /* Convert LBA to CHS */
1606 track = (u32)block / dev->sectors;
1607 cyl = track / dev->heads;
1608 head = track % dev->heads;
1609 sect = (u32)block % dev->sectors + 1;
1610
1611 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1612 (u32)block, track, cyl, head, sect);
1613
1614 /* Check whether the converted CHS can fit.
1615 Cylinder: 0-65535
1616 Head: 0-15
1617 Sector: 1-255*/
1618 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1619 goto out_of_range;
1620
1621 tf->command = ATA_CMD_VERIFY;
1622 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1623 tf->lbal = sect;
1624 tf->lbam = cyl;
1625 tf->lbah = cyl >> 8;
1626 tf->device |= head;
1627 }
1628
1629 return 0;
1630
1631 invalid_fld:
1632 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1633 /* "Invalid field in cbd" */
1634 return 1;
1635
1636 out_of_range:
1637 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1638 /* "Logical Block Address out of range" */
1639 return 1;
1640
1641 nothing_to_do:
1642 scmd->result = SAM_STAT_GOOD;
1643 return 1;
1644 }
1645
1646 /**
1647 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1648 * @qc: Storage for translated ATA taskfile
1649 *
1650 * Converts any of six SCSI read/write commands into the
1651 * ATA counterpart, including starting sector (LBA),
1652 * sector count, and taking into account the device's LBA48
1653 * support.
1654 *
1655 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1656 * %WRITE_16 are currently supported.
1657 *
1658 * LOCKING:
1659 * spin_lock_irqsave(host lock)
1660 *
1661 * RETURNS:
1662 * Zero on success, non-zero on error.
1663 */
1664 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1665 {
1666 struct scsi_cmnd *scmd = qc->scsicmd;
1667 const u8 *cdb = scmd->cmnd;
1668 unsigned int tf_flags = 0;
1669 u64 block;
1670 u32 n_block;
1671 int rc;
1672
1673 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1674 tf_flags |= ATA_TFLAG_WRITE;
1675
1676 /* Calculate the SCSI LBA, transfer length and FUA. */
1677 switch (cdb[0]) {
1678 case READ_10:
1679 case WRITE_10:
1680 if (unlikely(scmd->cmd_len < 10))
1681 goto invalid_fld;
1682 scsi_10_lba_len(cdb, &block, &n_block);
1683 if (cdb[1] & (1 << 3))
1684 tf_flags |= ATA_TFLAG_FUA;
1685 break;
1686 case READ_6:
1687 case WRITE_6:
1688 if (unlikely(scmd->cmd_len < 6))
1689 goto invalid_fld;
1690 scsi_6_lba_len(cdb, &block, &n_block);
1691
1692 /* for 6-byte r/w commands, transfer length 0
1693 * means 256 blocks of data, not 0 block.
1694 */
1695 if (!n_block)
1696 n_block = 256;
1697 break;
1698 case READ_16:
1699 case WRITE_16:
1700 if (unlikely(scmd->cmd_len < 16))
1701 goto invalid_fld;
1702 scsi_16_lba_len(cdb, &block, &n_block);
1703 if (cdb[1] & (1 << 3))
1704 tf_flags |= ATA_TFLAG_FUA;
1705 break;
1706 default:
1707 DPRINTK("no-byte command\n");
1708 goto invalid_fld;
1709 }
1710
1711 /* Check and compose ATA command */
1712 if (!n_block)
1713 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1714 * length 0 means transfer 0 block of data.
1715 * However, for ATA R/W commands, sector count 0 means
1716 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1717 *
1718 * WARNING: one or two older ATA drives treat 0 as 0...
1719 */
1720 goto nothing_to_do;
1721
1722 qc->flags |= ATA_QCFLAG_IO;
1723 qc->nbytes = n_block * scmd->device->sector_size;
1724
1725 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1726 qc->tag);
1727 if (likely(rc == 0))
1728 return 0;
1729
1730 if (rc == -ERANGE)
1731 goto out_of_range;
1732 /* treat all other errors as -EINVAL, fall through */
1733 invalid_fld:
1734 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1735 /* "Invalid field in cbd" */
1736 return 1;
1737
1738 out_of_range:
1739 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1740 /* "Logical Block Address out of range" */
1741 return 1;
1742
1743 nothing_to_do:
1744 scmd->result = SAM_STAT_GOOD;
1745 return 1;
1746 }
1747
1748 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1749 {
1750 struct ata_port *ap = qc->ap;
1751 struct scsi_cmnd *cmd = qc->scsicmd;
1752 u8 *cdb = cmd->cmnd;
1753 int need_sense = (qc->err_mask != 0);
1754
1755 /* For ATA pass thru (SAT) commands, generate a sense block if
1756 * user mandated it or if there's an error. Note that if we
1757 * generate because the user forced us to [CK_COND =1], a check
1758 * condition is generated and the ATA register values are returned
1759 * whether the command completed successfully or not. If there
1760 * was no error, we use the following sense data:
1761 * sk = RECOVERED ERROR
1762 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
1763 */
1764 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1765 ((cdb[2] & 0x20) || need_sense)) {
1766 ata_gen_passthru_sense(qc);
1767 } else {
1768 if (!need_sense) {
1769 cmd->result = SAM_STAT_GOOD;
1770 } else {
1771 /* TODO: decide which descriptor format to use
1772 * for 48b LBA devices and call that here
1773 * instead of the fixed desc, which is only
1774 * good for smaller LBA (and maybe CHS?)
1775 * devices.
1776 */
1777 ata_gen_ata_sense(qc);
1778 }
1779 }
1780
1781 if (need_sense && !ap->ops->error_handler)
1782 ata_dump_status(ap->print_id, &qc->result_tf);
1783
1784 qc->scsidone(cmd);
1785
1786 ata_qc_free(qc);
1787 }
1788
1789 /**
1790 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1791 * @dev: ATA device to which the command is addressed
1792 * @cmd: SCSI command to execute
1793 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1794 *
1795 * Our ->queuecommand() function has decided that the SCSI
1796 * command issued can be directly translated into an ATA
1797 * command, rather than handled internally.
1798 *
1799 * This function sets up an ata_queued_cmd structure for the
1800 * SCSI command, and sends that ata_queued_cmd to the hardware.
1801 *
1802 * The xlat_func argument (actor) returns 0 if ready to execute
1803 * ATA command, else 1 to finish translation. If 1 is returned
1804 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1805 * to be set reflecting an error condition or clean (early)
1806 * termination.
1807 *
1808 * LOCKING:
1809 * spin_lock_irqsave(host lock)
1810 *
1811 * RETURNS:
1812 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1813 * needs to be deferred.
1814 */
1815 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1816 ata_xlat_func_t xlat_func)
1817 {
1818 struct ata_port *ap = dev->link->ap;
1819 struct ata_queued_cmd *qc;
1820 int rc;
1821
1822 VPRINTK("ENTER\n");
1823
1824 qc = ata_scsi_qc_new(dev, cmd);
1825 if (!qc)
1826 goto err_mem;
1827
1828 /* data is present; dma-map it */
1829 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1830 cmd->sc_data_direction == DMA_TO_DEVICE) {
1831 if (unlikely(scsi_bufflen(cmd) < 1)) {
1832 ata_dev_warn(dev, "WARNING: zero len r/w req\n");
1833 goto err_did;
1834 }
1835
1836 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1837
1838 qc->dma_dir = cmd->sc_data_direction;
1839 }
1840
1841 qc->complete_fn = ata_scsi_qc_complete;
1842
1843 if (xlat_func(qc))
1844 goto early_finish;
1845
1846 if (ap->ops->qc_defer) {
1847 if ((rc = ap->ops->qc_defer(qc)))
1848 goto defer;
1849 }
1850
1851 /* select device, send command to hardware */
1852 ata_qc_issue(qc);
1853
1854 VPRINTK("EXIT\n");
1855 return 0;
1856
1857 early_finish:
1858 ata_qc_free(qc);
1859 cmd->scsi_done(cmd);
1860 DPRINTK("EXIT - early finish (good or error)\n");
1861 return 0;
1862
1863 err_did:
1864 ata_qc_free(qc);
1865 cmd->result = (DID_ERROR << 16);
1866 cmd->scsi_done(cmd);
1867 err_mem:
1868 DPRINTK("EXIT - internal\n");
1869 return 0;
1870
1871 defer:
1872 ata_qc_free(qc);
1873 DPRINTK("EXIT - defer\n");
1874 if (rc == ATA_DEFER_LINK)
1875 return SCSI_MLQUEUE_DEVICE_BUSY;
1876 else
1877 return SCSI_MLQUEUE_HOST_BUSY;
1878 }
1879
1880 /**
1881 * ata_scsi_rbuf_get - Map response buffer.
1882 * @cmd: SCSI command containing buffer to be mapped.
1883 * @flags: unsigned long variable to store irq enable status
1884 * @copy_in: copy in from user buffer
1885 *
1886 * Prepare buffer for simulated SCSI commands.
1887 *
1888 * LOCKING:
1889 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1890 *
1891 * RETURNS:
1892 * Pointer to response buffer.
1893 */
1894 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1895 unsigned long *flags)
1896 {
1897 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1898
1899 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1900 if (copy_in)
1901 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1902 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1903 return ata_scsi_rbuf;
1904 }
1905
1906 /**
1907 * ata_scsi_rbuf_put - Unmap response buffer.
1908 * @cmd: SCSI command containing buffer to be unmapped.
1909 * @copy_out: copy out result
1910 * @flags: @flags passed to ata_scsi_rbuf_get()
1911 *
1912 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1913 * @copy_back is true.
1914 *
1915 * LOCKING:
1916 * Unlocks ata_scsi_rbuf_lock.
1917 */
1918 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1919 unsigned long *flags)
1920 {
1921 if (copy_out)
1922 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1923 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1924 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1925 }
1926
1927 /**
1928 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1929 * @args: device IDENTIFY data / SCSI command of interest.
1930 * @actor: Callback hook for desired SCSI command simulator
1931 *
1932 * Takes care of the hard work of simulating a SCSI command...
1933 * Mapping the response buffer, calling the command's handler,
1934 * and handling the handler's return value. This return value
1935 * indicates whether the handler wishes the SCSI command to be
1936 * completed successfully (0), or not (in which case cmd->result
1937 * and sense buffer are assumed to be set).
1938 *
1939 * LOCKING:
1940 * spin_lock_irqsave(host lock)
1941 */
1942 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1943 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1944 {
1945 u8 *rbuf;
1946 unsigned int rc;
1947 struct scsi_cmnd *cmd = args->cmd;
1948 unsigned long flags;
1949
1950 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1951 rc = actor(args, rbuf);
1952 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
1953
1954 if (rc == 0)
1955 cmd->result = SAM_STAT_GOOD;
1956 args->done(cmd);
1957 }
1958
1959 /**
1960 * ata_scsiop_inq_std - Simulate INQUIRY command
1961 * @args: device IDENTIFY data / SCSI command of interest.
1962 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1963 *
1964 * Returns standard device identification data associated
1965 * with non-VPD INQUIRY command output.
1966 *
1967 * LOCKING:
1968 * spin_lock_irqsave(host lock)
1969 */
1970 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1971 {
1972 const u8 versions[] = {
1973 0x60, /* SAM-3 (no version claimed) */
1974
1975 0x03,
1976 0x20, /* SBC-2 (no version claimed) */
1977
1978 0x02,
1979 0x60 /* SPC-3 (no version claimed) */
1980 };
1981 u8 hdr[] = {
1982 TYPE_DISK,
1983 0,
1984 0x5, /* claim SPC-3 version compatibility */
1985 2,
1986 95 - 4
1987 };
1988
1989 VPRINTK("ENTER\n");
1990
1991 /* set scsi removeable (RMB) bit per ata bit */
1992 if (ata_id_removeable(args->id))
1993 hdr[1] |= (1 << 7);
1994
1995 memcpy(rbuf, hdr, sizeof(hdr));
1996 memcpy(&rbuf[8], "ATA ", 8);
1997 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1998 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1999
2000 if (rbuf[32] == 0 || rbuf[32] == ' ')
2001 memcpy(&rbuf[32], "n/a ", 4);
2002
2003 memcpy(rbuf + 59, versions, sizeof(versions));
2004
2005 return 0;
2006 }
2007
2008 /**
2009 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
2010 * @args: device IDENTIFY data / SCSI command of interest.
2011 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2012 *
2013 * Returns list of inquiry VPD pages available.
2014 *
2015 * LOCKING:
2016 * spin_lock_irqsave(host lock)
2017 */
2018 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
2019 {
2020 const u8 pages[] = {
2021 0x00, /* page 0x00, this page */
2022 0x80, /* page 0x80, unit serial no page */
2023 0x83, /* page 0x83, device ident page */
2024 0x89, /* page 0x89, ata info page */
2025 0xb0, /* page 0xb0, block limits page */
2026 0xb1, /* page 0xb1, block device characteristics page */
2027 0xb2, /* page 0xb2, thin provisioning page */
2028 };
2029
2030 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
2031 memcpy(rbuf + 4, pages, sizeof(pages));
2032 return 0;
2033 }
2034
2035 /**
2036 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
2037 * @args: device IDENTIFY data / SCSI command of interest.
2038 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2039 *
2040 * Returns ATA device serial number.
2041 *
2042 * LOCKING:
2043 * spin_lock_irqsave(host lock)
2044 */
2045 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
2046 {
2047 const u8 hdr[] = {
2048 0,
2049 0x80, /* this page code */
2050 0,
2051 ATA_ID_SERNO_LEN, /* page len */
2052 };
2053
2054 memcpy(rbuf, hdr, sizeof(hdr));
2055 ata_id_string(args->id, (unsigned char *) &rbuf[4],
2056 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2057 return 0;
2058 }
2059
2060 /**
2061 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2062 * @args: device IDENTIFY data / SCSI command of interest.
2063 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2064 *
2065 * Yields two logical unit device identification designators:
2066 * - vendor specific ASCII containing the ATA serial number
2067 * - SAT defined "t10 vendor id based" containing ASCII vendor
2068 * name ("ATA "), model and serial numbers.
2069 *
2070 * LOCKING:
2071 * spin_lock_irqsave(host lock)
2072 */
2073 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
2074 {
2075 const int sat_model_serial_desc_len = 68;
2076 int num;
2077
2078 rbuf[1] = 0x83; /* this page code */
2079 num = 4;
2080
2081 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2082 rbuf[num + 0] = 2;
2083 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2084 num += 4;
2085 ata_id_string(args->id, (unsigned char *) rbuf + num,
2086 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2087 num += ATA_ID_SERNO_LEN;
2088
2089 /* SAT defined lu model and serial numbers descriptor */
2090 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2091 rbuf[num + 0] = 2;
2092 rbuf[num + 1] = 1;
2093 rbuf[num + 3] = sat_model_serial_desc_len;
2094 num += 4;
2095 memcpy(rbuf + num, "ATA ", 8);
2096 num += 8;
2097 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2098 ATA_ID_PROD_LEN);
2099 num += ATA_ID_PROD_LEN;
2100 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2101 ATA_ID_SERNO_LEN);
2102 num += ATA_ID_SERNO_LEN;
2103
2104 if (ata_id_has_wwn(args->id)) {
2105 /* SAT defined lu world wide name */
2106 /* piv=0, assoc=lu, code_set=binary, designator=NAA */
2107 rbuf[num + 0] = 1;
2108 rbuf[num + 1] = 3;
2109 rbuf[num + 3] = ATA_ID_WWN_LEN;
2110 num += 4;
2111 ata_id_string(args->id, (unsigned char *) rbuf + num,
2112 ATA_ID_WWN, ATA_ID_WWN_LEN);
2113 num += ATA_ID_WWN_LEN;
2114 }
2115 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
2116 return 0;
2117 }
2118
2119 /**
2120 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2121 * @args: device IDENTIFY data / SCSI command of interest.
2122 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2123 *
2124 * Yields SAT-specified ATA VPD page.
2125 *
2126 * LOCKING:
2127 * spin_lock_irqsave(host lock)
2128 */
2129 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
2130 {
2131 struct ata_taskfile tf;
2132
2133 memset(&tf, 0, sizeof(tf));
2134
2135 rbuf[1] = 0x89; /* our page code */
2136 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2137 rbuf[3] = (0x238 & 0xff);
2138
2139 memcpy(&rbuf[8], "linux ", 8);
2140 memcpy(&rbuf[16], "libata ", 16);
2141 memcpy(&rbuf[32], DRV_VERSION, 4);
2142
2143 /* we don't store the ATA device signature, so we fake it */
2144
2145 tf.command = ATA_DRDY; /* really, this is Status reg */
2146 tf.lbal = 0x1;
2147 tf.nsect = 0x1;
2148
2149 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2150 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
2151
2152 rbuf[56] = ATA_CMD_ID_ATA;
2153
2154 memcpy(&rbuf[60], &args->id[0], 512);
2155 return 0;
2156 }
2157
2158 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
2159 {
2160 u16 min_io_sectors;
2161
2162 rbuf[1] = 0xb0;
2163 rbuf[3] = 0x3c; /* required VPD size with unmap support */
2164
2165 /*
2166 * Optimal transfer length granularity.
2167 *
2168 * This is always one physical block, but for disks with a smaller
2169 * logical than physical sector size we need to figure out what the
2170 * latter is.
2171 */
2172 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
2173 put_unaligned_be16(min_io_sectors, &rbuf[6]);
2174
2175 /*
2176 * Optimal unmap granularity.
2177 *
2178 * The ATA spec doesn't even know about a granularity or alignment
2179 * for the TRIM command. We can leave away most of the unmap related
2180 * VPD page entries, but we have specifify a granularity to signal
2181 * that we support some form of unmap - in thise case via WRITE SAME
2182 * with the unmap bit set.
2183 */
2184 if (ata_id_has_trim(args->id)) {
2185 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
2186 put_unaligned_be32(1, &rbuf[28]);
2187 }
2188
2189 return 0;
2190 }
2191
2192 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2193 {
2194 int form_factor = ata_id_form_factor(args->id);
2195 int media_rotation_rate = ata_id_rotation_rate(args->id);
2196
2197 rbuf[1] = 0xb1;
2198 rbuf[3] = 0x3c;
2199 rbuf[4] = media_rotation_rate >> 8;
2200 rbuf[5] = media_rotation_rate;
2201 rbuf[7] = form_factor;
2202
2203 return 0;
2204 }
2205
2206 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
2207 {
2208 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2209 rbuf[1] = 0xb2;
2210 rbuf[3] = 0x4;
2211 rbuf[5] = 1 << 6; /* TPWS */
2212
2213 return 0;
2214 }
2215
2216 /**
2217 * ata_scsiop_noop - Command handler that simply returns success.
2218 * @args: device IDENTIFY data / SCSI command of interest.
2219 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2220 *
2221 * No operation. Simply returns success to caller, to indicate
2222 * that the caller should successfully complete this SCSI command.
2223 *
2224 * LOCKING:
2225 * spin_lock_irqsave(host lock)
2226 */
2227 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
2228 {
2229 VPRINTK("ENTER\n");
2230 return 0;
2231 }
2232
2233 /**
2234 * modecpy - Prepare response for MODE SENSE
2235 * @dest: output buffer
2236 * @src: data being copied
2237 * @n: length of mode page
2238 * @changeable: whether changeable parameters are requested
2239 *
2240 * Generate a generic MODE SENSE page for either current or changeable
2241 * parameters.
2242 *
2243 * LOCKING:
2244 * None.
2245 */
2246 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
2247 {
2248 if (changeable) {
2249 memcpy(dest, src, 2);
2250 memset(dest + 2, 0, n - 2);
2251 } else {
2252 memcpy(dest, src, n);
2253 }
2254 }
2255
2256 /**
2257 * ata_msense_caching - Simulate MODE SENSE caching info page
2258 * @id: device IDENTIFY data
2259 * @buf: output buffer
2260 * @changeable: whether changeable parameters are requested
2261 *
2262 * Generate a caching info page, which conditionally indicates
2263 * write caching to the SCSI layer, depending on device
2264 * capabilities.
2265 *
2266 * LOCKING:
2267 * None.
2268 */
2269 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
2270 {
2271 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
2272 if (changeable || ata_id_wcache_enabled(id))
2273 buf[2] |= (1 << 2); /* write cache enable */
2274 if (!changeable && !ata_id_rahead_enabled(id))
2275 buf[12] |= (1 << 5); /* disable read ahead */
2276 return sizeof(def_cache_mpage);
2277 }
2278
2279 /**
2280 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2281 * @buf: output buffer
2282 * @changeable: whether changeable parameters are requested
2283 *
2284 * Generate a generic MODE SENSE control mode page.
2285 *
2286 * LOCKING:
2287 * None.
2288 */
2289 static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable)
2290 {
2291 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable);
2292 return sizeof(def_control_mpage);
2293 }
2294
2295 /**
2296 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2297 * @buf: output buffer
2298 * @changeable: whether changeable parameters are requested
2299 *
2300 * Generate a generic MODE SENSE r/w error recovery page.
2301 *
2302 * LOCKING:
2303 * None.
2304 */
2305 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable)
2306 {
2307 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage),
2308 changeable);
2309 return sizeof(def_rw_recovery_mpage);
2310 }
2311
2312 /*
2313 * We can turn this into a real blacklist if it's needed, for now just
2314 * blacklist any Maxtor BANC1G10 revision firmware
2315 */
2316 static int ata_dev_supports_fua(u16 *id)
2317 {
2318 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2319
2320 if (!libata_fua)
2321 return 0;
2322 if (!ata_id_has_fua(id))
2323 return 0;
2324
2325 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2326 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2327
2328 if (strcmp(model, "Maxtor"))
2329 return 1;
2330 if (strcmp(fw, "BANC1G10"))
2331 return 1;
2332
2333 return 0; /* blacklisted */
2334 }
2335
2336 /**
2337 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2338 * @args: device IDENTIFY data / SCSI command of interest.
2339 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2340 *
2341 * Simulate MODE SENSE commands. Assume this is invoked for direct
2342 * access devices (e.g. disks) only. There should be no block
2343 * descriptor for other device types.
2344 *
2345 * LOCKING:
2346 * spin_lock_irqsave(host lock)
2347 */
2348 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
2349 {
2350 struct ata_device *dev = args->dev;
2351 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
2352 const u8 sat_blk_desc[] = {
2353 0, 0, 0, 0, /* number of blocks: sat unspecified */
2354 0,
2355 0, 0x2, 0x0 /* block length: 512 bytes */
2356 };
2357 u8 pg, spg;
2358 unsigned int ebd, page_control, six_byte;
2359 u8 dpofua;
2360
2361 VPRINTK("ENTER\n");
2362
2363 six_byte = (scsicmd[0] == MODE_SENSE);
2364 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2365 /*
2366 * LLBA bit in msense(10) ignored (compliant)
2367 */
2368
2369 page_control = scsicmd[2] >> 6;
2370 switch (page_control) {
2371 case 0: /* current */
2372 case 1: /* changeable */
2373 case 2: /* defaults */
2374 break; /* supported */
2375 case 3: /* saved */
2376 goto saving_not_supp;
2377 default:
2378 goto invalid_fld;
2379 }
2380
2381 if (six_byte)
2382 p += 4 + (ebd ? 8 : 0);
2383 else
2384 p += 8 + (ebd ? 8 : 0);
2385
2386 pg = scsicmd[2] & 0x3f;
2387 spg = scsicmd[3];
2388 /*
2389 * No mode subpages supported (yet) but asking for _all_
2390 * subpages may be valid
2391 */
2392 if (spg && (spg != ALL_SUB_MPAGES))
2393 goto invalid_fld;
2394
2395 switch(pg) {
2396 case RW_RECOVERY_MPAGE:
2397 p += ata_msense_rw_recovery(p, page_control == 1);
2398 break;
2399
2400 case CACHE_MPAGE:
2401 p += ata_msense_caching(args->id, p, page_control == 1);
2402 break;
2403
2404 case CONTROL_MPAGE:
2405 p += ata_msense_ctl_mode(p, page_control == 1);
2406 break;
2407
2408 case ALL_MPAGES:
2409 p += ata_msense_rw_recovery(p, page_control == 1);
2410 p += ata_msense_caching(args->id, p, page_control == 1);
2411 p += ata_msense_ctl_mode(p, page_control == 1);
2412 break;
2413
2414 default: /* invalid page code */
2415 goto invalid_fld;
2416 }
2417
2418 dpofua = 0;
2419 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2420 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2421 dpofua = 1 << 4;
2422
2423 if (six_byte) {
2424 rbuf[0] = p - rbuf - 1;
2425 rbuf[2] |= dpofua;
2426 if (ebd) {
2427 rbuf[3] = sizeof(sat_blk_desc);
2428 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2429 }
2430 } else {
2431 unsigned int output_len = p - rbuf - 2;
2432
2433 rbuf[0] = output_len >> 8;
2434 rbuf[1] = output_len;
2435 rbuf[3] |= dpofua;
2436 if (ebd) {
2437 rbuf[7] = sizeof(sat_blk_desc);
2438 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2439 }
2440 }
2441 return 0;
2442
2443 invalid_fld:
2444 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2445 /* "Invalid field in cbd" */
2446 return 1;
2447
2448 saving_not_supp:
2449 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2450 /* "Saving parameters not supported" */
2451 return 1;
2452 }
2453
2454 /**
2455 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2456 * @args: device IDENTIFY data / SCSI command of interest.
2457 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2458 *
2459 * Simulate READ CAPACITY commands.
2460 *
2461 * LOCKING:
2462 * None.
2463 */
2464 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
2465 {
2466 struct ata_device *dev = args->dev;
2467 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
2468 u32 sector_size; /* physical sector size in bytes */
2469 u8 log2_per_phys;
2470 u16 lowest_aligned;
2471
2472 sector_size = ata_id_logical_sector_size(dev->id);
2473 log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2474 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
2475
2476 VPRINTK("ENTER\n");
2477
2478 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2479 if (last_lba >= 0xffffffffULL)
2480 last_lba = 0xffffffff;
2481
2482 /* sector count, 32-bit */
2483 rbuf[0] = last_lba >> (8 * 3);
2484 rbuf[1] = last_lba >> (8 * 2);
2485 rbuf[2] = last_lba >> (8 * 1);
2486 rbuf[3] = last_lba;
2487
2488 /* sector size */
2489 rbuf[4] = sector_size >> (8 * 3);
2490 rbuf[5] = sector_size >> (8 * 2);
2491 rbuf[6] = sector_size >> (8 * 1);
2492 rbuf[7] = sector_size;
2493 } else {
2494 /* sector count, 64-bit */
2495 rbuf[0] = last_lba >> (8 * 7);
2496 rbuf[1] = last_lba >> (8 * 6);
2497 rbuf[2] = last_lba >> (8 * 5);
2498 rbuf[3] = last_lba >> (8 * 4);
2499 rbuf[4] = last_lba >> (8 * 3);
2500 rbuf[5] = last_lba >> (8 * 2);
2501 rbuf[6] = last_lba >> (8 * 1);
2502 rbuf[7] = last_lba;
2503
2504 /* sector size */
2505 rbuf[ 8] = sector_size >> (8 * 3);
2506 rbuf[ 9] = sector_size >> (8 * 2);
2507 rbuf[10] = sector_size >> (8 * 1);
2508 rbuf[11] = sector_size;
2509
2510 rbuf[12] = 0;
2511 rbuf[13] = log2_per_phys;
2512 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2513 rbuf[15] = lowest_aligned;
2514
2515 if (ata_id_has_trim(args->id)) {
2516 rbuf[14] |= 0x80; /* TPE */
2517
2518 if (ata_id_has_zero_after_trim(args->id))
2519 rbuf[14] |= 0x40; /* TPRZ */
2520 }
2521 }
2522
2523 return 0;
2524 }
2525
2526 /**
2527 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2528 * @args: device IDENTIFY data / SCSI command of interest.
2529 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2530 *
2531 * Simulate REPORT LUNS command.
2532 *
2533 * LOCKING:
2534 * spin_lock_irqsave(host lock)
2535 */
2536 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
2537 {
2538 VPRINTK("ENTER\n");
2539 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2540
2541 return 0;
2542 }
2543
2544 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2545 {
2546 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2547 /* FIXME: not quite right; we don't want the
2548 * translation of taskfile registers into
2549 * a sense descriptors, since that's only
2550 * correct for ATA, not ATAPI
2551 */
2552 ata_gen_passthru_sense(qc);
2553 }
2554
2555 qc->scsidone(qc->scsicmd);
2556 ata_qc_free(qc);
2557 }
2558
2559 /* is it pointless to prefer PIO for "safety reasons"? */
2560 static inline int ata_pio_use_silly(struct ata_port *ap)
2561 {
2562 return (ap->flags & ATA_FLAG_PIO_DMA);
2563 }
2564
2565 static void atapi_request_sense(struct ata_queued_cmd *qc)
2566 {
2567 struct ata_port *ap = qc->ap;
2568 struct scsi_cmnd *cmd = qc->scsicmd;
2569
2570 DPRINTK("ATAPI request sense\n");
2571
2572 /* FIXME: is this needed? */
2573 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2574
2575 #ifdef CONFIG_ATA_SFF
2576 if (ap->ops->sff_tf_read)
2577 ap->ops->sff_tf_read(ap, &qc->tf);
2578 #endif
2579
2580 /* fill these in, for the case where they are -not- overwritten */
2581 cmd->sense_buffer[0] = 0x70;
2582 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2583
2584 ata_qc_reinit(qc);
2585
2586 /* setup sg table and init transfer direction */
2587 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2588 ata_sg_init(qc, &qc->sgent, 1);
2589 qc->dma_dir = DMA_FROM_DEVICE;
2590
2591 memset(&qc->cdb, 0, qc->dev->cdb_len);
2592 qc->cdb[0] = REQUEST_SENSE;
2593 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2594
2595 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2596 qc->tf.command = ATA_CMD_PACKET;
2597
2598 if (ata_pio_use_silly(ap)) {
2599 qc->tf.protocol = ATAPI_PROT_DMA;
2600 qc->tf.feature |= ATAPI_PKT_DMA;
2601 } else {
2602 qc->tf.protocol = ATAPI_PROT_PIO;
2603 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2604 qc->tf.lbah = 0;
2605 }
2606 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2607
2608 qc->complete_fn = atapi_sense_complete;
2609
2610 ata_qc_issue(qc);
2611
2612 DPRINTK("EXIT\n");
2613 }
2614
2615 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2616 {
2617 struct scsi_cmnd *cmd = qc->scsicmd;
2618 unsigned int err_mask = qc->err_mask;
2619
2620 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2621
2622 /* handle completion from new EH */
2623 if (unlikely(qc->ap->ops->error_handler &&
2624 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2625
2626 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2627 /* FIXME: not quite right; we don't want the
2628 * translation of taskfile registers into a
2629 * sense descriptors, since that's only
2630 * correct for ATA, not ATAPI
2631 */
2632 ata_gen_passthru_sense(qc);
2633 }
2634
2635 /* SCSI EH automatically locks door if sdev->locked is
2636 * set. Sometimes door lock request continues to
2637 * fail, for example, when no media is present. This
2638 * creates a loop - SCSI EH issues door lock which
2639 * fails and gets invoked again to acquire sense data
2640 * for the failed command.
2641 *
2642 * If door lock fails, always clear sdev->locked to
2643 * avoid this infinite loop.
2644 *
2645 * This may happen before SCSI scan is complete. Make
2646 * sure qc->dev->sdev isn't NULL before dereferencing.
2647 */
2648 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
2649 qc->dev->sdev->locked = 0;
2650
2651 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2652 qc->scsidone(cmd);
2653 ata_qc_free(qc);
2654 return;
2655 }
2656
2657 /* successful completion or old EH failure path */
2658 if (unlikely(err_mask & AC_ERR_DEV)) {
2659 cmd->result = SAM_STAT_CHECK_CONDITION;
2660 atapi_request_sense(qc);
2661 return;
2662 } else if (unlikely(err_mask)) {
2663 /* FIXME: not quite right; we don't want the
2664 * translation of taskfile registers into
2665 * a sense descriptors, since that's only
2666 * correct for ATA, not ATAPI
2667 */
2668 ata_gen_passthru_sense(qc);
2669 } else {
2670 u8 *scsicmd = cmd->cmnd;
2671
2672 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2673 unsigned long flags;
2674 u8 *buf;
2675
2676 buf = ata_scsi_rbuf_get(cmd, true, &flags);
2677
2678 /* ATAPI devices typically report zero for their SCSI version,
2679 * and sometimes deviate from the spec WRT response data
2680 * format. If SCSI version is reported as zero like normal,
2681 * then we make the following fixups: 1) Fake MMC-5 version,
2682 * to indicate to the Linux scsi midlayer this is a modern
2683 * device. 2) Ensure response data format / ATAPI information
2684 * are always correct.
2685 */
2686 if (buf[2] == 0) {
2687 buf[2] = 0x5;
2688 buf[3] = 0x32;
2689 }
2690
2691 ata_scsi_rbuf_put(cmd, true, &flags);
2692 }
2693
2694 cmd->result = SAM_STAT_GOOD;
2695 }
2696
2697 qc->scsidone(cmd);
2698 ata_qc_free(qc);
2699 }
2700 /**
2701 * atapi_xlat - Initialize PACKET taskfile
2702 * @qc: command structure to be initialized
2703 *
2704 * LOCKING:
2705 * spin_lock_irqsave(host lock)
2706 *
2707 * RETURNS:
2708 * Zero on success, non-zero on failure.
2709 */
2710 static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2711 {
2712 struct scsi_cmnd *scmd = qc->scsicmd;
2713 struct ata_device *dev = qc->dev;
2714 int nodata = (scmd->sc_data_direction == DMA_NONE);
2715 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2716 unsigned int nbytes;
2717
2718 memset(qc->cdb, 0, dev->cdb_len);
2719 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2720
2721 qc->complete_fn = atapi_qc_complete;
2722
2723 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2724 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2725 qc->tf.flags |= ATA_TFLAG_WRITE;
2726 DPRINTK("direction: write\n");
2727 }
2728
2729 qc->tf.command = ATA_CMD_PACKET;
2730 ata_qc_set_pc_nbytes(qc);
2731
2732 /* check whether ATAPI DMA is safe */
2733 if (!nodata && !using_pio && atapi_check_dma(qc))
2734 using_pio = 1;
2735
2736 /* Some controller variants snoop this value for Packet
2737 * transfers to do state machine and FIFO management. Thus we
2738 * want to set it properly, and for DMA where it is
2739 * effectively meaningless.
2740 */
2741 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2742
2743 /* Most ATAPI devices which honor transfer chunk size don't
2744 * behave according to the spec when odd chunk size which
2745 * matches the transfer length is specified. If the number of
2746 * bytes to transfer is 2n+1. According to the spec, what
2747 * should happen is to indicate that 2n+1 is going to be
2748 * transferred and transfer 2n+2 bytes where the last byte is
2749 * padding.
2750 *
2751 * In practice, this doesn't happen. ATAPI devices first
2752 * indicate and transfer 2n bytes and then indicate and
2753 * transfer 2 bytes where the last byte is padding.
2754 *
2755 * This inconsistency confuses several controllers which
2756 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2757 * These controllers use actual number of transferred bytes to
2758 * update DMA poitner and transfer of 4n+2 bytes make those
2759 * controller push DMA pointer by 4n+4 bytes because SATA data
2760 * FISes are aligned to 4 bytes. This causes data corruption
2761 * and buffer overrun.
2762 *
2763 * Always setting nbytes to even number solves this problem
2764 * because then ATAPI devices don't have to split data at 2n
2765 * boundaries.
2766 */
2767 if (nbytes & 0x1)
2768 nbytes++;
2769
2770 qc->tf.lbam = (nbytes & 0xFF);
2771 qc->tf.lbah = (nbytes >> 8);
2772
2773 if (nodata)
2774 qc->tf.protocol = ATAPI_PROT_NODATA;
2775 else if (using_pio)
2776 qc->tf.protocol = ATAPI_PROT_PIO;
2777 else {
2778 /* DMA data xfer */
2779 qc->tf.protocol = ATAPI_PROT_DMA;
2780 qc->tf.feature |= ATAPI_PKT_DMA;
2781
2782 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2783 (scmd->sc_data_direction != DMA_TO_DEVICE))
2784 /* some SATA bridges need us to indicate data xfer direction */
2785 qc->tf.feature |= ATAPI_DMADIR;
2786 }
2787
2788
2789 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2790 as ATAPI tape drives don't get this right otherwise */
2791 return 0;
2792 }
2793
2794 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2795 {
2796 if (!sata_pmp_attached(ap)) {
2797 if (likely(devno < ata_link_max_devices(&ap->link)))
2798 return &ap->link.device[devno];
2799 } else {
2800 if (likely(devno < ap->nr_pmp_links))
2801 return &ap->pmp_link[devno].device[0];
2802 }
2803
2804 return NULL;
2805 }
2806
2807 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2808 const struct scsi_device *scsidev)
2809 {
2810 int devno;
2811
2812 /* skip commands not addressed to targets we simulate */
2813 if (!sata_pmp_attached(ap)) {
2814 if (unlikely(scsidev->channel || scsidev->lun))
2815 return NULL;
2816 devno = scsidev->id;
2817 } else {
2818 if (unlikely(scsidev->id || scsidev->lun))
2819 return NULL;
2820 devno = scsidev->channel;
2821 }
2822
2823 return ata_find_dev(ap, devno);
2824 }
2825
2826 /**
2827 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2828 * @ap: ATA port to which the device is attached
2829 * @scsidev: SCSI device from which we derive the ATA device
2830 *
2831 * Given various information provided in struct scsi_cmnd,
2832 * map that onto an ATA bus, and using that mapping
2833 * determine which ata_device is associated with the
2834 * SCSI command to be sent.
2835 *
2836 * LOCKING:
2837 * spin_lock_irqsave(host lock)
2838 *
2839 * RETURNS:
2840 * Associated ATA device, or %NULL if not found.
2841 */
2842 static struct ata_device *
2843 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2844 {
2845 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2846
2847 if (unlikely(!dev || !ata_dev_enabled(dev)))
2848 return NULL;
2849
2850 return dev;
2851 }
2852
2853 /*
2854 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2855 * @byte1: Byte 1 from pass-thru CDB.
2856 *
2857 * RETURNS:
2858 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2859 */
2860 static u8
2861 ata_scsi_map_proto(u8 byte1)
2862 {
2863 switch((byte1 & 0x1e) >> 1) {
2864 case 3: /* Non-data */
2865 return ATA_PROT_NODATA;
2866
2867 case 6: /* DMA */
2868 case 10: /* UDMA Data-in */
2869 case 11: /* UDMA Data-Out */
2870 return ATA_PROT_DMA;
2871
2872 case 4: /* PIO Data-in */
2873 case 5: /* PIO Data-out */
2874 return ATA_PROT_PIO;
2875
2876 case 0: /* Hard Reset */
2877 case 1: /* SRST */
2878 case 8: /* Device Diagnostic */
2879 case 9: /* Device Reset */
2880 case 7: /* DMA Queued */
2881 case 12: /* FPDMA */
2882 case 15: /* Return Response Info */
2883 default: /* Reserved */
2884 break;
2885 }
2886
2887 return ATA_PROT_UNKNOWN;
2888 }
2889
2890 /**
2891 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2892 * @qc: command structure to be initialized
2893 *
2894 * Handles either 12 or 16-byte versions of the CDB.
2895 *
2896 * RETURNS:
2897 * Zero on success, non-zero on failure.
2898 */
2899 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2900 {
2901 struct ata_taskfile *tf = &(qc->tf);
2902 struct scsi_cmnd *scmd = qc->scsicmd;
2903 struct ata_device *dev = qc->dev;
2904 const u8 *cdb = scmd->cmnd;
2905
2906 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2907 goto invalid_fld;
2908
2909 /*
2910 * 12 and 16 byte CDBs use different offsets to
2911 * provide the various register values.
2912 */
2913 if (cdb[0] == ATA_16) {
2914 /*
2915 * 16-byte CDB - may contain extended commands.
2916 *
2917 * If that is the case, copy the upper byte register values.
2918 */
2919 if (cdb[1] & 0x01) {
2920 tf->hob_feature = cdb[3];
2921 tf->hob_nsect = cdb[5];
2922 tf->hob_lbal = cdb[7];
2923 tf->hob_lbam = cdb[9];
2924 tf->hob_lbah = cdb[11];
2925 tf->flags |= ATA_TFLAG_LBA48;
2926 } else
2927 tf->flags &= ~ATA_TFLAG_LBA48;
2928
2929 /*
2930 * Always copy low byte, device and command registers.
2931 */
2932 tf->feature = cdb[4];
2933 tf->nsect = cdb[6];
2934 tf->lbal = cdb[8];
2935 tf->lbam = cdb[10];
2936 tf->lbah = cdb[12];
2937 tf->device = cdb[13];
2938 tf->command = cdb[14];
2939 } else {
2940 /*
2941 * 12-byte CDB - incapable of extended commands.
2942 */
2943 tf->flags &= ~ATA_TFLAG_LBA48;
2944
2945 tf->feature = cdb[3];
2946 tf->nsect = cdb[4];
2947 tf->lbal = cdb[5];
2948 tf->lbam = cdb[6];
2949 tf->lbah = cdb[7];
2950 tf->device = cdb[8];
2951 tf->command = cdb[9];
2952 }
2953
2954 /* enforce correct master/slave bit */
2955 tf->device = dev->devno ?
2956 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2957
2958 switch (tf->command) {
2959 /* READ/WRITE LONG use a non-standard sect_size */
2960 case ATA_CMD_READ_LONG:
2961 case ATA_CMD_READ_LONG_ONCE:
2962 case ATA_CMD_WRITE_LONG:
2963 case ATA_CMD_WRITE_LONG_ONCE:
2964 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2965 goto invalid_fld;
2966 qc->sect_size = scsi_bufflen(scmd);
2967 break;
2968
2969 /* commands using reported Logical Block size (e.g. 512 or 4K) */
2970 case ATA_CMD_CFA_WRITE_NE:
2971 case ATA_CMD_CFA_TRANS_SECT:
2972 case ATA_CMD_CFA_WRITE_MULT_NE:
2973 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
2974 case ATA_CMD_READ:
2975 case ATA_CMD_READ_EXT:
2976 case ATA_CMD_READ_QUEUED:
2977 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
2978 case ATA_CMD_FPDMA_READ:
2979 case ATA_CMD_READ_MULTI:
2980 case ATA_CMD_READ_MULTI_EXT:
2981 case ATA_CMD_PIO_READ:
2982 case ATA_CMD_PIO_READ_EXT:
2983 case ATA_CMD_READ_STREAM_DMA_EXT:
2984 case ATA_CMD_READ_STREAM_EXT:
2985 case ATA_CMD_VERIFY:
2986 case ATA_CMD_VERIFY_EXT:
2987 case ATA_CMD_WRITE:
2988 case ATA_CMD_WRITE_EXT:
2989 case ATA_CMD_WRITE_FUA_EXT:
2990 case ATA_CMD_WRITE_QUEUED:
2991 case ATA_CMD_WRITE_QUEUED_FUA_EXT:
2992 case ATA_CMD_FPDMA_WRITE:
2993 case ATA_CMD_WRITE_MULTI:
2994 case ATA_CMD_WRITE_MULTI_EXT:
2995 case ATA_CMD_WRITE_MULTI_FUA_EXT:
2996 case ATA_CMD_PIO_WRITE:
2997 case ATA_CMD_PIO_WRITE_EXT:
2998 case ATA_CMD_WRITE_STREAM_DMA_EXT:
2999 case ATA_CMD_WRITE_STREAM_EXT:
3000 qc->sect_size = scmd->device->sector_size;
3001 break;
3002
3003 /* Everything else uses 512 byte "sectors" */
3004 default:
3005 qc->sect_size = ATA_SECT_SIZE;
3006 }
3007
3008 /*
3009 * Set flags so that all registers will be written, pass on
3010 * write indication (used for PIO/DMA setup), result TF is
3011 * copied back and we don't whine too much about its failure.
3012 */
3013 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3014 if (scmd->sc_data_direction == DMA_TO_DEVICE)
3015 tf->flags |= ATA_TFLAG_WRITE;
3016
3017 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
3018
3019 /*
3020 * Set transfer length.
3021 *
3022 * TODO: find out if we need to do more here to
3023 * cover scatter/gather case.
3024 */
3025 ata_qc_set_pc_nbytes(qc);
3026
3027 /* We may not issue DMA commands if no DMA mode is set */
3028 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
3029 goto invalid_fld;
3030
3031 /* sanity check for pio multi commands */
3032 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
3033 goto invalid_fld;
3034
3035 if (is_multi_taskfile(tf)) {
3036 unsigned int multi_count = 1 << (cdb[1] >> 5);
3037
3038 /* compare the passed through multi_count
3039 * with the cached multi_count of libata
3040 */
3041 if (multi_count != dev->multi_count)
3042 ata_dev_warn(dev, "invalid multi_count %u ignored\n",
3043 multi_count);
3044 }
3045
3046 /*
3047 * Filter SET_FEATURES - XFER MODE command -- otherwise,
3048 * SET_FEATURES - XFER MODE must be preceded/succeeded
3049 * by an update to hardware-specific registers for each
3050 * controller (i.e. the reason for ->set_piomode(),
3051 * ->set_dmamode(), and ->post_set_mode() hooks).
3052 */
3053 if (tf->command == ATA_CMD_SET_FEATURES &&
3054 tf->feature == SETFEATURES_XFER)
3055 goto invalid_fld;
3056
3057 /*
3058 * Filter TPM commands by default. These provide an
3059 * essentially uncontrolled encrypted "back door" between
3060 * applications and the disk. Set libata.allow_tpm=1 if you
3061 * have a real reason for wanting to use them. This ensures
3062 * that installed software cannot easily mess stuff up without
3063 * user intent. DVR type users will probably ship with this enabled
3064 * for movie content management.
3065 *
3066 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3067 * for this and should do in future but that it is not sufficient as
3068 * DCS is an optional feature set. Thus we also do the software filter
3069 * so that we comply with the TC consortium stated goal that the user
3070 * can turn off TC features of their system.
3071 */
3072 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
3073 goto invalid_fld;
3074
3075 return 0;
3076
3077 invalid_fld:
3078 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3079 /* "Invalid field in cdb" */
3080 return 1;
3081 }
3082
3083 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3084 {
3085 struct ata_taskfile *tf = &qc->tf;
3086 struct scsi_cmnd *scmd = qc->scsicmd;
3087 struct ata_device *dev = qc->dev;
3088 const u8 *cdb = scmd->cmnd;
3089 u64 block;
3090 u32 n_block;
3091 u32 size;
3092 void *buf;
3093
3094 /* we may not issue DMA commands if no DMA mode is set */
3095 if (unlikely(!dev->dma_mode))
3096 goto invalid_fld;
3097
3098 if (unlikely(scmd->cmd_len < 16))
3099 goto invalid_fld;
3100 scsi_16_lba_len(cdb, &block, &n_block);
3101
3102 /* for now we only support WRITE SAME with the unmap bit set */
3103 if (unlikely(!(cdb[1] & 0x8)))
3104 goto invalid_fld;
3105
3106 /*
3107 * WRITE SAME always has a sector sized buffer as payload, this
3108 * should never be a multiple entry S/G list.
3109 */
3110 if (!scsi_sg_count(scmd))
3111 goto invalid_fld;
3112
3113 buf = page_address(sg_page(scsi_sglist(scmd)));
3114 size = ata_set_lba_range_entries(buf, 512, block, n_block);
3115
3116 tf->protocol = ATA_PROT_DMA;
3117 tf->hob_feature = 0;
3118 tf->feature = ATA_DSM_TRIM;
3119 tf->hob_nsect = (size / 512) >> 8;
3120 tf->nsect = size / 512;
3121 tf->command = ATA_CMD_DSM;
3122 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3123 ATA_TFLAG_WRITE;
3124
3125 ata_qc_set_pc_nbytes(qc);
3126
3127 return 0;
3128
3129 invalid_fld:
3130 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3131 /* "Invalid field in cdb" */
3132 return 1;
3133 }
3134
3135 /**
3136 * ata_mselect_caching - Simulate MODE SELECT for caching info page
3137 * @qc: Storage for translated ATA taskfile
3138 * @buf: input buffer
3139 * @len: number of valid bytes in the input buffer
3140 *
3141 * Prepare a taskfile to modify caching information for the device.
3142 *
3143 * LOCKING:
3144 * None.
3145 */
3146 static int ata_mselect_caching(struct ata_queued_cmd *qc,
3147 const u8 *buf, int len)
3148 {
3149 struct ata_taskfile *tf = &qc->tf;
3150 struct ata_device *dev = qc->dev;
3151 char mpage[CACHE_MPAGE_LEN];
3152 u8 wce;
3153
3154 /*
3155 * The first two bytes of def_cache_mpage are a header, so offsets
3156 * in mpage are off by 2 compared to buf. Same for len.
3157 */
3158
3159 if (len != CACHE_MPAGE_LEN - 2)
3160 return -EINVAL;
3161
3162 wce = buf[0] & (1 << 2);
3163
3164 /*
3165 * Check that read-only bits are not modified.
3166 */
3167 ata_msense_caching(dev->id, mpage, false);
3168 mpage[2] &= ~(1 << 2);
3169 mpage[2] |= wce;
3170 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0)
3171 return -EINVAL;
3172
3173 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3174 tf->protocol = ATA_PROT_NODATA;
3175 tf->nsect = 0;
3176 tf->command = ATA_CMD_SET_FEATURES;
3177 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF;
3178 return 0;
3179 }
3180
3181 /**
3182 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands
3183 * @qc: Storage for translated ATA taskfile
3184 *
3185 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
3186 * Assume this is invoked for direct access devices (e.g. disks) only.
3187 * There should be no block descriptor for other device types.
3188 *
3189 * LOCKING:
3190 * spin_lock_irqsave(host lock)
3191 */
3192 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
3193 {
3194 struct scsi_cmnd *scmd = qc->scsicmd;
3195 const u8 *cdb = scmd->cmnd;
3196 const u8 *p;
3197 u8 pg, spg;
3198 unsigned six_byte, pg_len, hdr_len, bd_len;
3199 int len;
3200
3201 VPRINTK("ENTER\n");
3202
3203 six_byte = (cdb[0] == MODE_SELECT);
3204 if (six_byte) {
3205 if (scmd->cmd_len < 5)
3206 goto invalid_fld;
3207
3208 len = cdb[4];
3209 hdr_len = 4;
3210 } else {
3211 if (scmd->cmd_len < 9)
3212 goto invalid_fld;
3213
3214 len = (cdb[7] << 8) + cdb[8];
3215 hdr_len = 8;
3216 }
3217
3218 /* We only support PF=1, SP=0. */
3219 if ((cdb[1] & 0x11) != 0x10)
3220 goto invalid_fld;
3221
3222 /* Test early for possible overrun. */
3223 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len)
3224 goto invalid_param_len;
3225
3226 p = page_address(sg_page(scsi_sglist(scmd)));
3227
3228 /* Move past header and block descriptors. */
3229 if (len < hdr_len)
3230 goto invalid_param_len;
3231
3232 if (six_byte)
3233 bd_len = p[3];
3234 else
3235 bd_len = (p[6] << 8) + p[7];
3236
3237 len -= hdr_len;
3238 p += hdr_len;
3239 if (len < bd_len)
3240 goto invalid_param_len;
3241 if (bd_len != 0 && bd_len != 8)
3242 goto invalid_param;
3243
3244 len -= bd_len;
3245 p += bd_len;
3246 if (len == 0)
3247 goto skip;
3248
3249 /* Parse both possible formats for the mode page headers. */
3250 pg = p[0] & 0x3f;
3251 if (p[0] & 0x40) {
3252 if (len < 4)
3253 goto invalid_param_len;
3254
3255 spg = p[1];
3256 pg_len = (p[2] << 8) | p[3];
3257 p += 4;
3258 len -= 4;
3259 } else {
3260 if (len < 2)
3261 goto invalid_param_len;
3262
3263 spg = 0;
3264 pg_len = p[1];
3265 p += 2;
3266 len -= 2;
3267 }
3268
3269 /*
3270 * No mode subpages supported (yet) but asking for _all_
3271 * subpages may be valid
3272 */
3273 if (spg && (spg != ALL_SUB_MPAGES))
3274 goto invalid_param;
3275 if (pg_len > len)
3276 goto invalid_param_len;
3277
3278 switch (pg) {
3279 case CACHE_MPAGE:
3280 if (ata_mselect_caching(qc, p, pg_len) < 0)
3281 goto invalid_param;
3282 break;
3283
3284 default: /* invalid page code */
3285 goto invalid_param;
3286 }
3287
3288 /*
3289 * Only one page has changeable data, so we only support setting one
3290 * page at a time.
3291 */
3292 if (len > pg_len)
3293 goto invalid_param;
3294
3295 return 0;
3296
3297 invalid_fld:
3298 /* "Invalid field in CDB" */
3299 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
3300 return 1;
3301
3302 invalid_param:
3303 /* "Invalid field in parameter list" */
3304 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0);
3305 return 1;
3306
3307 invalid_param_len:
3308 /* "Parameter list length error" */
3309 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3310 return 1;
3311
3312 skip:
3313 scmd->result = SAM_STAT_GOOD;
3314 return 1;
3315 }
3316
3317 /**
3318 * ata_get_xlat_func - check if SCSI to ATA translation is possible
3319 * @dev: ATA device
3320 * @cmd: SCSI command opcode to consider
3321 *
3322 * Look up the SCSI command given, and determine whether the
3323 * SCSI command is to be translated or simulated.
3324 *
3325 * RETURNS:
3326 * Pointer to translation function if possible, %NULL if not.
3327 */
3328
3329 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
3330 {
3331 switch (cmd) {
3332 case READ_6:
3333 case READ_10:
3334 case READ_16:
3335
3336 case WRITE_6:
3337 case WRITE_10:
3338 case WRITE_16:
3339 return ata_scsi_rw_xlat;
3340
3341 case WRITE_SAME_16:
3342 return ata_scsi_write_same_xlat;
3343
3344 case SYNCHRONIZE_CACHE:
3345 if (ata_try_flush_cache(dev))
3346 return ata_scsi_flush_xlat;
3347 break;
3348
3349 case VERIFY:
3350 case VERIFY_16:
3351 return ata_scsi_verify_xlat;
3352
3353 case ATA_12:
3354 case ATA_16:
3355 return ata_scsi_pass_thru;
3356
3357 case MODE_SELECT:
3358 case MODE_SELECT_10:
3359 return ata_scsi_mode_select_xlat;
3360 break;
3361
3362 case START_STOP:
3363 return ata_scsi_start_stop_xlat;
3364 }
3365
3366 return NULL;
3367 }
3368
3369 /**
3370 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3371 * @ap: ATA port to which the command was being sent
3372 * @cmd: SCSI command to dump
3373 *
3374 * Prints the contents of a SCSI command via printk().
3375 */
3376
3377 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
3378 struct scsi_cmnd *cmd)
3379 {
3380 #ifdef ATA_DEBUG
3381 struct scsi_device *scsidev = cmd->device;
3382 u8 *scsicmd = cmd->cmnd;
3383
3384 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
3385 ap->print_id,
3386 scsidev->channel, scsidev->id, scsidev->lun,
3387 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
3388 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
3389 scsicmd[8]);
3390 #endif
3391 }
3392
3393 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
3394 struct ata_device *dev)
3395 {
3396 u8 scsi_op = scmd->cmnd[0];
3397 ata_xlat_func_t xlat_func;
3398 int rc = 0;
3399
3400 if (dev->class == ATA_DEV_ATA) {
3401 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
3402 goto bad_cdb_len;
3403
3404 xlat_func = ata_get_xlat_func(dev, scsi_op);
3405 } else {
3406 if (unlikely(!scmd->cmd_len))
3407 goto bad_cdb_len;
3408
3409 xlat_func = NULL;
3410 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
3411 /* relay SCSI command to ATAPI device */
3412 int len = COMMAND_SIZE(scsi_op);
3413 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
3414 goto bad_cdb_len;
3415
3416 xlat_func = atapi_xlat;
3417 } else {
3418 /* ATA_16 passthru, treat as an ATA command */
3419 if (unlikely(scmd->cmd_len > 16))
3420 goto bad_cdb_len;
3421
3422 xlat_func = ata_get_xlat_func(dev, scsi_op);
3423 }
3424 }
3425
3426 if (xlat_func)
3427 rc = ata_scsi_translate(dev, scmd, xlat_func);
3428 else
3429 ata_scsi_simulate(dev, scmd);
3430
3431 return rc;
3432
3433 bad_cdb_len:
3434 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3435 scmd->cmd_len, scsi_op, dev->cdb_len);
3436 scmd->result = DID_ERROR << 16;
3437 scmd->scsi_done(scmd);
3438 return 0;
3439 }
3440
3441 /**
3442 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3443 * @shost: SCSI host of command to be sent
3444 * @cmd: SCSI command to be sent
3445 *
3446 * In some cases, this function translates SCSI commands into
3447 * ATA taskfiles, and queues the taskfiles to be sent to
3448 * hardware. In other cases, this function simulates a
3449 * SCSI device by evaluating and responding to certain
3450 * SCSI commands. This creates the overall effect of
3451 * ATA and ATAPI devices appearing as SCSI devices.
3452 *
3453 * LOCKING:
3454 * ATA host lock
3455 *
3456 * RETURNS:
3457 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3458 * 0 otherwise.
3459 */
3460 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
3461 {
3462 struct ata_port *ap;
3463 struct ata_device *dev;
3464 struct scsi_device *scsidev = cmd->device;
3465 int rc = 0;
3466 unsigned long irq_flags;
3467
3468 ap = ata_shost_to_port(shost);
3469
3470 spin_lock_irqsave(ap->lock, irq_flags);
3471
3472 ata_scsi_dump_cdb(ap, cmd);
3473
3474 dev = ata_scsi_find_dev(ap, scsidev);
3475 if (likely(dev))
3476 rc = __ata_scsi_queuecmd(cmd, dev);
3477 else {
3478 cmd->result = (DID_BAD_TARGET << 16);
3479 cmd->scsi_done(cmd);
3480 }
3481
3482 spin_unlock_irqrestore(ap->lock, irq_flags);
3483
3484 return rc;
3485 }
3486
3487 /**
3488 * ata_scsi_simulate - simulate SCSI command on ATA device
3489 * @dev: the target device
3490 * @cmd: SCSI command being sent to device.
3491 *
3492 * Interprets and directly executes a select list of SCSI commands
3493 * that can be handled internally.
3494 *
3495 * LOCKING:
3496 * spin_lock_irqsave(host lock)
3497 */
3498
3499 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
3500 {
3501 struct ata_scsi_args args;
3502 const u8 *scsicmd = cmd->cmnd;
3503 u8 tmp8;
3504
3505 args.dev = dev;
3506 args.id = dev->id;
3507 args.cmd = cmd;
3508 args.done = cmd->scsi_done;
3509
3510 switch(scsicmd[0]) {
3511 /* TODO: worth improving? */
3512 case FORMAT_UNIT:
3513 ata_scsi_invalid_field(cmd);
3514 break;
3515
3516 case INQUIRY:
3517 if (scsicmd[1] & 2) /* is CmdDt set? */
3518 ata_scsi_invalid_field(cmd);
3519 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3520 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3521 else switch (scsicmd[2]) {
3522 case 0x00:
3523 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3524 break;
3525 case 0x80:
3526 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3527 break;
3528 case 0x83:
3529 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3530 break;
3531 case 0x89:
3532 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3533 break;
3534 case 0xb0:
3535 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
3536 break;
3537 case 0xb1:
3538 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3539 break;
3540 case 0xb2:
3541 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
3542 break;
3543 default:
3544 ata_scsi_invalid_field(cmd);
3545 break;
3546 }
3547 break;
3548
3549 case MODE_SENSE:
3550 case MODE_SENSE_10:
3551 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3552 break;
3553
3554 case READ_CAPACITY:
3555 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3556 break;
3557
3558 case SERVICE_ACTION_IN:
3559 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3560 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3561 else
3562 ata_scsi_invalid_field(cmd);
3563 break;
3564
3565 case REPORT_LUNS:
3566 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3567 break;
3568
3569 case REQUEST_SENSE:
3570 ata_scsi_set_sense(cmd, 0, 0, 0);
3571 cmd->result = (DRIVER_SENSE << 24);
3572 cmd->scsi_done(cmd);
3573 break;
3574
3575 /* if we reach this, then writeback caching is disabled,
3576 * turning this into a no-op.
3577 */
3578 case SYNCHRONIZE_CACHE:
3579 /* fall through */
3580
3581 /* no-op's, complete with success */
3582 case REZERO_UNIT:
3583 case SEEK_6:
3584 case SEEK_10:
3585 case TEST_UNIT_READY:
3586 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3587 break;
3588
3589 case SEND_DIAGNOSTIC:
3590 tmp8 = scsicmd[1] & ~(1 << 3);
3591 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3592 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3593 else
3594 ata_scsi_invalid_field(cmd);
3595 break;
3596
3597 /* all other commands */
3598 default:
3599 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3600 /* "Invalid command operation code" */
3601 cmd->scsi_done(cmd);
3602 break;
3603 }
3604 }
3605
3606 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3607 {
3608 int i, rc;
3609
3610 for (i = 0; i < host->n_ports; i++) {
3611 struct ata_port *ap = host->ports[i];
3612 struct Scsi_Host *shost;
3613
3614 rc = -ENOMEM;
3615 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3616 if (!shost)
3617 goto err_alloc;
3618
3619 shost->eh_noresume = 1;
3620 *(struct ata_port **)&shost->hostdata[0] = ap;
3621 ap->scsi_host = shost;
3622
3623 shost->transportt = ata_scsi_transport_template;
3624 shost->unique_id = ap->print_id;
3625 shost->max_id = 16;
3626 shost->max_lun = 1;
3627 shost->max_channel = 1;
3628 shost->max_cmd_len = 16;
3629 shost->no_write_same = 1;
3630
3631 /* Schedule policy is determined by ->qc_defer()
3632 * callback and it needs to see every deferred qc.
3633 * Set host_blocked to 1 to prevent SCSI midlayer from
3634 * automatically deferring requests.
3635 */
3636 shost->max_host_blocked = 1;
3637
3638 rc = scsi_add_host_with_dma(ap->scsi_host,
3639 &ap->tdev, ap->host->dev);
3640 if (rc)
3641 goto err_add;
3642 }
3643
3644 return 0;
3645
3646 err_add:
3647 scsi_host_put(host->ports[i]->scsi_host);
3648 err_alloc:
3649 while (--i >= 0) {
3650 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3651
3652 scsi_remove_host(shost);
3653 scsi_host_put(shost);
3654 }
3655 return rc;
3656 }
3657
3658 void ata_scsi_scan_host(struct ata_port *ap, int sync)
3659 {
3660 int tries = 5;
3661 struct ata_device *last_failed_dev = NULL;
3662 struct ata_link *link;
3663 struct ata_device *dev;
3664
3665 repeat:
3666 ata_for_each_link(link, ap, EDGE) {
3667 ata_for_each_dev(dev, link, ENABLED) {
3668 struct scsi_device *sdev;
3669 int channel = 0, id = 0;
3670
3671 if (dev->sdev)
3672 continue;
3673
3674 if (ata_is_host_link(link))
3675 id = dev->devno;
3676 else
3677 channel = link->pmp;
3678
3679 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3680 NULL);
3681 if (!IS_ERR(sdev)) {
3682 dev->sdev = sdev;
3683 scsi_device_put(sdev);
3684 if (zpodd_dev_enabled(dev))
3685 dev_pm_qos_expose_flags(
3686 &sdev->sdev_gendev, 0);
3687 } else {
3688 dev->sdev = NULL;
3689 }
3690 }
3691 }
3692
3693 /* If we scanned while EH was in progress or allocation
3694 * failure occurred, scan would have failed silently. Check
3695 * whether all devices are attached.
3696 */
3697 ata_for_each_link(link, ap, EDGE) {
3698 ata_for_each_dev(dev, link, ENABLED) {
3699 if (!dev->sdev)
3700 goto exit_loop;
3701 }
3702 }
3703 exit_loop:
3704 if (!link)
3705 return;
3706
3707 /* we're missing some SCSI devices */
3708 if (sync) {
3709 /* If caller requested synchrnous scan && we've made
3710 * any progress, sleep briefly and repeat.
3711 */
3712 if (dev != last_failed_dev) {
3713 msleep(100);
3714 last_failed_dev = dev;
3715 goto repeat;
3716 }
3717
3718 /* We might be failing to detect boot device, give it
3719 * a few more chances.
3720 */
3721 if (--tries) {
3722 msleep(100);
3723 goto repeat;
3724 }
3725
3726 ata_port_err(ap,
3727 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
3728 }
3729
3730 queue_delayed_work(system_long_wq, &ap->hotplug_task,
3731 round_jiffies_relative(HZ));
3732 }
3733
3734 /**
3735 * ata_scsi_offline_dev - offline attached SCSI device
3736 * @dev: ATA device to offline attached SCSI device for
3737 *
3738 * This function is called from ata_eh_hotplug() and responsible
3739 * for taking the SCSI device attached to @dev offline. This
3740 * function is called with host lock which protects dev->sdev
3741 * against clearing.
3742 *
3743 * LOCKING:
3744 * spin_lock_irqsave(host lock)
3745 *
3746 * RETURNS:
3747 * 1 if attached SCSI device exists, 0 otherwise.
3748 */
3749 int ata_scsi_offline_dev(struct ata_device *dev)
3750 {
3751 if (dev->sdev) {
3752 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3753 return 1;
3754 }
3755 return 0;
3756 }
3757
3758 /**
3759 * ata_scsi_remove_dev - remove attached SCSI device
3760 * @dev: ATA device to remove attached SCSI device for
3761 *
3762 * This function is called from ata_eh_scsi_hotplug() and
3763 * responsible for removing the SCSI device attached to @dev.
3764 *
3765 * LOCKING:
3766 * Kernel thread context (may sleep).
3767 */
3768 static void ata_scsi_remove_dev(struct ata_device *dev)
3769 {
3770 struct ata_port *ap = dev->link->ap;
3771 struct scsi_device *sdev;
3772 unsigned long flags;
3773
3774 /* Alas, we need to grab scan_mutex to ensure SCSI device
3775 * state doesn't change underneath us and thus
3776 * scsi_device_get() always succeeds. The mutex locking can
3777 * be removed if there is __scsi_device_get() interface which
3778 * increments reference counts regardless of device state.
3779 */
3780 mutex_lock(&ap->scsi_host->scan_mutex);
3781 spin_lock_irqsave(ap->lock, flags);
3782
3783 if (zpodd_dev_enabled(dev))
3784 zpodd_exit(dev);
3785
3786 /* clearing dev->sdev is protected by host lock */
3787 sdev = dev->sdev;
3788 dev->sdev = NULL;
3789
3790 if (sdev) {
3791 /* If user initiated unplug races with us, sdev can go
3792 * away underneath us after the host lock and
3793 * scan_mutex are released. Hold onto it.
3794 */
3795 if (scsi_device_get(sdev) == 0) {
3796 /* The following ensures the attached sdev is
3797 * offline on return from ata_scsi_offline_dev()
3798 * regardless it wins or loses the race
3799 * against this function.
3800 */
3801 scsi_device_set_state(sdev, SDEV_OFFLINE);
3802 } else {
3803 WARN_ON(1);
3804 sdev = NULL;
3805 }
3806 }
3807
3808 spin_unlock_irqrestore(ap->lock, flags);
3809 mutex_unlock(&ap->scsi_host->scan_mutex);
3810
3811 if (sdev) {
3812 ata_dev_info(dev, "detaching (SCSI %s)\n",
3813 dev_name(&sdev->sdev_gendev));
3814
3815 scsi_remove_device(sdev);
3816 scsi_device_put(sdev);
3817 }
3818 }
3819
3820 static void ata_scsi_handle_link_detach(struct ata_link *link)
3821 {
3822 struct ata_port *ap = link->ap;
3823 struct ata_device *dev;
3824
3825 ata_for_each_dev(dev, link, ALL) {
3826 unsigned long flags;
3827
3828 if (!(dev->flags & ATA_DFLAG_DETACHED))
3829 continue;
3830
3831 spin_lock_irqsave(ap->lock, flags);
3832 dev->flags &= ~ATA_DFLAG_DETACHED;
3833 spin_unlock_irqrestore(ap->lock, flags);
3834
3835 ata_scsi_remove_dev(dev);
3836 }
3837 }
3838
3839 /**
3840 * ata_scsi_media_change_notify - send media change event
3841 * @dev: Pointer to the disk device with media change event
3842 *
3843 * Tell the block layer to send a media change notification
3844 * event.
3845 *
3846 * LOCKING:
3847 * spin_lock_irqsave(host lock)
3848 */
3849 void ata_scsi_media_change_notify(struct ata_device *dev)
3850 {
3851 if (dev->sdev)
3852 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3853 GFP_ATOMIC);
3854 }
3855
3856 /**
3857 * ata_scsi_hotplug - SCSI part of hotplug
3858 * @work: Pointer to ATA port to perform SCSI hotplug on
3859 *
3860 * Perform SCSI part of hotplug. It's executed from a separate
3861 * workqueue after EH completes. This is necessary because SCSI
3862 * hot plugging requires working EH and hot unplugging is
3863 * synchronized with hot plugging with a mutex.
3864 *
3865 * LOCKING:
3866 * Kernel thread context (may sleep).
3867 */
3868 void ata_scsi_hotplug(struct work_struct *work)
3869 {
3870 struct ata_port *ap =
3871 container_of(work, struct ata_port, hotplug_task.work);
3872 int i;
3873
3874 if (ap->pflags & ATA_PFLAG_UNLOADING) {
3875 DPRINTK("ENTER/EXIT - unloading\n");
3876 return;
3877 }
3878
3879 /*
3880 * XXX - UGLY HACK
3881 *
3882 * The block layer suspend/resume path is fundamentally broken due
3883 * to freezable kthreads and workqueue and may deadlock if a block
3884 * device gets removed while resume is in progress. I don't know
3885 * what the solution is short of removing freezable kthreads and
3886 * workqueues altogether.
3887 *
3888 * The following is an ugly hack to avoid kicking off device
3889 * removal while freezer is active. This is a joke but does avoid
3890 * this particular deadlock scenario.
3891 *
3892 * https://bugzilla.kernel.org/show_bug.cgi?id=62801
3893 * http://marc.info/?l=linux-kernel&m=138695698516487
3894 */
3895 #ifdef CONFIG_FREEZER
3896 while (pm_freezing)
3897 msleep(10);
3898 #endif
3899
3900 DPRINTK("ENTER\n");
3901 mutex_lock(&ap->scsi_scan_mutex);
3902
3903 /* Unplug detached devices. We cannot use link iterator here
3904 * because PMP links have to be scanned even if PMP is
3905 * currently not attached. Iterate manually.
3906 */
3907 ata_scsi_handle_link_detach(&ap->link);
3908 if (ap->pmp_link)
3909 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3910 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3911
3912 /* scan for new ones */
3913 ata_scsi_scan_host(ap, 0);
3914
3915 mutex_unlock(&ap->scsi_scan_mutex);
3916 DPRINTK("EXIT\n");
3917 }
3918
3919 /**
3920 * ata_scsi_user_scan - indication for user-initiated bus scan
3921 * @shost: SCSI host to scan
3922 * @channel: Channel to scan
3923 * @id: ID to scan
3924 * @lun: LUN to scan
3925 *
3926 * This function is called when user explicitly requests bus
3927 * scan. Set probe pending flag and invoke EH.
3928 *
3929 * LOCKING:
3930 * SCSI layer (we don't care)
3931 *
3932 * RETURNS:
3933 * Zero.
3934 */
3935 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3936 unsigned int id, unsigned int lun)
3937 {
3938 struct ata_port *ap = ata_shost_to_port(shost);
3939 unsigned long flags;
3940 int devno, rc = 0;
3941
3942 if (!ap->ops->error_handler)
3943 return -EOPNOTSUPP;
3944
3945 if (lun != SCAN_WILD_CARD && lun)
3946 return -EINVAL;
3947
3948 if (!sata_pmp_attached(ap)) {
3949 if (channel != SCAN_WILD_CARD && channel)
3950 return -EINVAL;
3951 devno = id;
3952 } else {
3953 if (id != SCAN_WILD_CARD && id)
3954 return -EINVAL;
3955 devno = channel;
3956 }
3957
3958 spin_lock_irqsave(ap->lock, flags);
3959
3960 if (devno == SCAN_WILD_CARD) {
3961 struct ata_link *link;
3962
3963 ata_for_each_link(link, ap, EDGE) {
3964 struct ata_eh_info *ehi = &link->eh_info;
3965 ehi->probe_mask |= ATA_ALL_DEVICES;
3966 ehi->action |= ATA_EH_RESET;
3967 }
3968 } else {
3969 struct ata_device *dev = ata_find_dev(ap, devno);
3970
3971 if (dev) {
3972 struct ata_eh_info *ehi = &dev->link->eh_info;
3973 ehi->probe_mask |= 1 << dev->devno;
3974 ehi->action |= ATA_EH_RESET;
3975 } else
3976 rc = -EINVAL;
3977 }
3978
3979 if (rc == 0) {
3980 ata_port_schedule_eh(ap);
3981 spin_unlock_irqrestore(ap->lock, flags);
3982 ata_port_wait_eh(ap);
3983 } else
3984 spin_unlock_irqrestore(ap->lock, flags);
3985
3986 return rc;
3987 }
3988
3989 /**
3990 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3991 * @work: Pointer to ATA port to perform scsi_rescan_device()
3992 *
3993 * After ATA pass thru (SAT) commands are executed successfully,
3994 * libata need to propagate the changes to SCSI layer.
3995 *
3996 * LOCKING:
3997 * Kernel thread context (may sleep).
3998 */
3999 void ata_scsi_dev_rescan(struct work_struct *work)
4000 {
4001 struct ata_port *ap =
4002 container_of(work, struct ata_port, scsi_rescan_task);
4003 struct ata_link *link;
4004 struct ata_device *dev;
4005 unsigned long flags;
4006
4007 mutex_lock(&ap->scsi_scan_mutex);
4008 spin_lock_irqsave(ap->lock, flags);
4009
4010 ata_for_each_link(link, ap, EDGE) {
4011 ata_for_each_dev(dev, link, ENABLED) {
4012 struct scsi_device *sdev = dev->sdev;
4013
4014 if (!sdev)
4015 continue;
4016 if (scsi_device_get(sdev))
4017 continue;
4018
4019 spin_unlock_irqrestore(ap->lock, flags);
4020 scsi_rescan_device(&(sdev->sdev_gendev));
4021 scsi_device_put(sdev);
4022 spin_lock_irqsave(ap->lock, flags);
4023 }
4024 }
4025
4026 spin_unlock_irqrestore(ap->lock, flags);
4027 mutex_unlock(&ap->scsi_scan_mutex);
4028 }
4029
4030 /**
4031 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
4032 * @host: ATA host container for all SAS ports
4033 * @port_info: Information from low-level host driver
4034 * @shost: SCSI host that the scsi device is attached to
4035 *
4036 * LOCKING:
4037 * PCI/etc. bus probe sem.
4038 *
4039 * RETURNS:
4040 * ata_port pointer on success / NULL on failure.
4041 */
4042
4043 struct ata_port *ata_sas_port_alloc(struct ata_host *host,
4044 struct ata_port_info *port_info,
4045 struct Scsi_Host *shost)
4046 {
4047 struct ata_port *ap;
4048
4049 ap = ata_port_alloc(host);
4050 if (!ap)
4051 return NULL;
4052
4053 ap->port_no = 0;
4054 ap->lock = &host->lock;
4055 ap->pio_mask = port_info->pio_mask;
4056 ap->mwdma_mask = port_info->mwdma_mask;
4057 ap->udma_mask = port_info->udma_mask;
4058 ap->flags |= port_info->flags;
4059 ap->ops = port_info->port_ops;
4060 ap->cbl = ATA_CBL_SATA;
4061
4062 return ap;
4063 }
4064 EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
4065
4066 /**
4067 * ata_sas_port_start - Set port up for dma.
4068 * @ap: Port to initialize
4069 *
4070 * Called just after data structures for each port are
4071 * initialized.
4072 *
4073 * May be used as the port_start() entry in ata_port_operations.
4074 *
4075 * LOCKING:
4076 * Inherited from caller.
4077 */
4078 int ata_sas_port_start(struct ata_port *ap)
4079 {
4080 /*
4081 * the port is marked as frozen at allocation time, but if we don't
4082 * have new eh, we won't thaw it
4083 */
4084 if (!ap->ops->error_handler)
4085 ap->pflags &= ~ATA_PFLAG_FROZEN;
4086 return 0;
4087 }
4088 EXPORT_SYMBOL_GPL(ata_sas_port_start);
4089
4090 /**
4091 * ata_port_stop - Undo ata_sas_port_start()
4092 * @ap: Port to shut down
4093 *
4094 * May be used as the port_stop() entry in ata_port_operations.
4095 *
4096 * LOCKING:
4097 * Inherited from caller.
4098 */
4099
4100 void ata_sas_port_stop(struct ata_port *ap)
4101 {
4102 }
4103 EXPORT_SYMBOL_GPL(ata_sas_port_stop);
4104
4105 /**
4106 * ata_sas_async_probe - simply schedule probing and return
4107 * @ap: Port to probe
4108 *
4109 * For batch scheduling of probe for sas attached ata devices, assumes
4110 * the port has already been through ata_sas_port_init()
4111 */
4112 void ata_sas_async_probe(struct ata_port *ap)
4113 {
4114 __ata_port_probe(ap);
4115 }
4116 EXPORT_SYMBOL_GPL(ata_sas_async_probe);
4117
4118 int ata_sas_sync_probe(struct ata_port *ap)
4119 {
4120 return ata_port_probe(ap);
4121 }
4122 EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
4123
4124
4125 /**
4126 * ata_sas_port_init - Initialize a SATA device
4127 * @ap: SATA port to initialize
4128 *
4129 * LOCKING:
4130 * PCI/etc. bus probe sem.
4131 *
4132 * RETURNS:
4133 * Zero on success, non-zero on error.
4134 */
4135
4136 int ata_sas_port_init(struct ata_port *ap)
4137 {
4138 int rc = ap->ops->port_start(ap);
4139
4140 if (rc)
4141 return rc;
4142 ap->print_id = atomic_inc_return(&ata_print_id);
4143 return 0;
4144 }
4145 EXPORT_SYMBOL_GPL(ata_sas_port_init);
4146
4147 /**
4148 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
4149 * @ap: SATA port to destroy
4150 *
4151 */
4152
4153 void ata_sas_port_destroy(struct ata_port *ap)
4154 {
4155 if (ap->ops->port_stop)
4156 ap->ops->port_stop(ap);
4157 kfree(ap);
4158 }
4159 EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
4160
4161 /**
4162 * ata_sas_slave_configure - Default slave_config routine for libata devices
4163 * @sdev: SCSI device to configure
4164 * @ap: ATA port to which SCSI device is attached
4165 *
4166 * RETURNS:
4167 * Zero.
4168 */
4169
4170 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
4171 {
4172 ata_scsi_sdev_config(sdev);
4173 ata_scsi_dev_config(sdev, ap->link.device);
4174 return 0;
4175 }
4176 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
4177
4178 /**
4179 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
4180 * @cmd: SCSI command to be sent
4181 * @ap: ATA port to which the command is being sent
4182 *
4183 * RETURNS:
4184 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4185 * 0 otherwise.
4186 */
4187
4188 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
4189 {
4190 int rc = 0;
4191
4192 ata_scsi_dump_cdb(ap, cmd);
4193
4194 if (likely(ata_dev_enabled(ap->link.device)))
4195 rc = __ata_scsi_queuecmd(cmd, ap->link.device);
4196 else {
4197 cmd->result = (DID_BAD_TARGET << 16);
4198 cmd->scsi_done(cmd);
4199 }
4200 return rc;
4201 }
4202 EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
kernel source for telekom puls (alcatel/mediatek)