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brd: limit 'max_part' module param to DISK_MAX_PARTS
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / ata / libata-scsi.c
blob600f6353ecf8743f608260b268a5a58c6442789e
1 /*
2 * libata-scsi.c - helper library for ATA
3 *
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
6 * on emails.
7 *
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
10 *
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 *
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
29 *
30 * Hardware documentation available from
31 * - http://www.t10.org/
32 * - http://www.t13.org/
33 *
34 */
35
36 #include <linux/slab.h>
37 #include <linux/kernel.h>
38 #include <linux/blkdev.h>
39 #include <linux/spinlock.h>
40 #include <scsi/scsi.h>
41 #include <scsi/scsi_host.h>
42 #include <scsi/scsi_cmnd.h>
43 #include <scsi/scsi_eh.h>
44 #include <scsi/scsi_device.h>
45 #include <scsi/scsi_tcq.h>
46 #include <scsi/scsi_transport.h>
47 #include <linux/libata.h>
48 #include <linux/hdreg.h>
49 #include <linux/uaccess.h>
50 #include <linux/suspend.h>
51 #include <asm/unaligned.h>
52
53 #include "libata.h"
54 #include "libata-transport.h"
55
56 #define ATA_SCSI_RBUF_SIZE 4096
57
58 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
59 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
60
61 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
62
63 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
64 const struct scsi_device *scsidev);
65 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
66 const struct scsi_device *scsidev);
67
68 #define RW_RECOVERY_MPAGE 0x1
69 #define RW_RECOVERY_MPAGE_LEN 12
70 #define CACHE_MPAGE 0x8
71 #define CACHE_MPAGE_LEN 20
72 #define CONTROL_MPAGE 0xa
73 #define CONTROL_MPAGE_LEN 12
74 #define ALL_MPAGES 0x3f
75 #define ALL_SUB_MPAGES 0xff
76
77
78 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
79 RW_RECOVERY_MPAGE,
80 RW_RECOVERY_MPAGE_LEN - 2,
81 (1 << 7), /* AWRE */
82 0, /* read retry count */
83 0, 0, 0, 0,
84 0, /* write retry count */
85 0, 0, 0
86 };
87
88 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
89 CACHE_MPAGE,
90 CACHE_MPAGE_LEN - 2,
91 0, /* contains WCE, needs to be 0 for logic */
92 0, 0, 0, 0, 0, 0, 0, 0, 0,
93 0, /* contains DRA, needs to be 0 for logic */
94 0, 0, 0, 0, 0, 0, 0
95 };
96
97 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
98 CONTROL_MPAGE,
99 CONTROL_MPAGE_LEN - 2,
100 2, /* DSENSE=0, GLTSD=1 */
101 0, /* [QAM+QERR may be 1, see 05-359r1] */
102 0, 0, 0, 0, 0xff, 0xff,
103 0, 30 /* extended self test time, see 05-359r1 */
104 };
105
106 static const char *ata_lpm_policy_names[] = {
107 [ATA_LPM_UNKNOWN] = "max_performance",
108 [ATA_LPM_MAX_POWER] = "max_performance",
109 [ATA_LPM_MED_POWER] = "medium_power",
110 [ATA_LPM_MIN_POWER] = "min_power",
111 };
112
113 static ssize_t ata_scsi_lpm_store(struct device *dev,
114 struct device_attribute *attr,
115 const char *buf, size_t count)
116 {
117 struct Scsi_Host *shost = class_to_shost(dev);
118 struct ata_port *ap = ata_shost_to_port(shost);
119 enum ata_lpm_policy policy;
120 unsigned long flags;
121
122 /* UNKNOWN is internal state, iterate from MAX_POWER */
123 for (policy = ATA_LPM_MAX_POWER;
124 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
125 const char *name = ata_lpm_policy_names[policy];
126
127 if (strncmp(name, buf, strlen(name)) == 0)
128 break;
129 }
130 if (policy == ARRAY_SIZE(ata_lpm_policy_names))
131 return -EINVAL;
132
133 spin_lock_irqsave(ap->lock, flags);
134 ap->target_lpm_policy = policy;
135 ata_port_schedule_eh(ap);
136 spin_unlock_irqrestore(ap->lock, flags);
137
138 return count;
139 }
140
141 static ssize_t ata_scsi_lpm_show(struct device *dev,
142 struct device_attribute *attr, char *buf)
143 {
144 struct Scsi_Host *shost = class_to_shost(dev);
145 struct ata_port *ap = ata_shost_to_port(shost);
146
147 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
148 return -EINVAL;
149
150 return snprintf(buf, PAGE_SIZE, "%s\n",
151 ata_lpm_policy_names[ap->target_lpm_policy]);
152 }
153 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
154 ata_scsi_lpm_show, ata_scsi_lpm_store);
155 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
156
157 static ssize_t ata_scsi_park_show(struct device *device,
158 struct device_attribute *attr, char *buf)
159 {
160 struct scsi_device *sdev = to_scsi_device(device);
161 struct ata_port *ap;
162 struct ata_link *link;
163 struct ata_device *dev;
164 unsigned long flags, now;
165 unsigned int uninitialized_var(msecs);
166 int rc = 0;
167
168 ap = ata_shost_to_port(sdev->host);
169
170 spin_lock_irqsave(ap->lock, flags);
171 dev = ata_scsi_find_dev(ap, sdev);
172 if (!dev) {
173 rc = -ENODEV;
174 goto unlock;
175 }
176 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
177 rc = -EOPNOTSUPP;
178 goto unlock;
179 }
180
181 link = dev->link;
182 now = jiffies;
183 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
184 link->eh_context.unloaded_mask & (1 << dev->devno) &&
185 time_after(dev->unpark_deadline, now))
186 msecs = jiffies_to_msecs(dev->unpark_deadline - now);
187 else
188 msecs = 0;
189
190 unlock:
191 spin_unlock_irq(ap->lock);
192
193 return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
194 }
195
196 static ssize_t ata_scsi_park_store(struct device *device,
197 struct device_attribute *attr,
198 const char *buf, size_t len)
199 {
200 struct scsi_device *sdev = to_scsi_device(device);
201 struct ata_port *ap;
202 struct ata_device *dev;
203 long int input;
204 unsigned long flags;
205 int rc;
206
207 rc = strict_strtol(buf, 10, &input);
208 if (rc || input < -2)
209 return -EINVAL;
210 if (input > ATA_TMOUT_MAX_PARK) {
211 rc = -EOVERFLOW;
212 input = ATA_TMOUT_MAX_PARK;
213 }
214
215 ap = ata_shost_to_port(sdev->host);
216
217 spin_lock_irqsave(ap->lock, flags);
218 dev = ata_scsi_find_dev(ap, sdev);
219 if (unlikely(!dev)) {
220 rc = -ENODEV;
221 goto unlock;
222 }
223 if (dev->class != ATA_DEV_ATA) {
224 rc = -EOPNOTSUPP;
225 goto unlock;
226 }
227
228 if (input >= 0) {
229 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
230 rc = -EOPNOTSUPP;
231 goto unlock;
232 }
233
234 dev->unpark_deadline = ata_deadline(jiffies, input);
235 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
236 ata_port_schedule_eh(ap);
237 complete(&ap->park_req_pending);
238 } else {
239 switch (input) {
240 case -1:
241 dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
242 break;
243 case -2:
244 dev->flags |= ATA_DFLAG_NO_UNLOAD;
245 break;
246 }
247 }
248 unlock:
249 spin_unlock_irqrestore(ap->lock, flags);
250
251 return rc ? rc : len;
252 }
253 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
254 ata_scsi_park_show, ata_scsi_park_store);
255 EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
256
257 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
258 {
259 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
260
261 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
262 }
263
264 static ssize_t
265 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
266 const char *buf, size_t count)
267 {
268 struct Scsi_Host *shost = class_to_shost(dev);
269 struct ata_port *ap = ata_shost_to_port(shost);
270 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
271 return ap->ops->em_store(ap, buf, count);
272 return -EINVAL;
273 }
274
275 static ssize_t
276 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
277 char *buf)
278 {
279 struct Scsi_Host *shost = class_to_shost(dev);
280 struct ata_port *ap = ata_shost_to_port(shost);
281
282 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
283 return ap->ops->em_show(ap, buf);
284 return -EINVAL;
285 }
286 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
287 ata_scsi_em_message_show, ata_scsi_em_message_store);
288 EXPORT_SYMBOL_GPL(dev_attr_em_message);
289
290 static ssize_t
291 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
292 char *buf)
293 {
294 struct Scsi_Host *shost = class_to_shost(dev);
295 struct ata_port *ap = ata_shost_to_port(shost);
296
297 return snprintf(buf, 23, "%d\n", ap->em_message_type);
298 }
299 DEVICE_ATTR(em_message_type, S_IRUGO,
300 ata_scsi_em_message_type_show, NULL);
301 EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
302
303 static ssize_t
304 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
305 char *buf)
306 {
307 struct scsi_device *sdev = to_scsi_device(dev);
308 struct ata_port *ap = ata_shost_to_port(sdev->host);
309 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
310
311 if (ap->ops->sw_activity_show && (ap->flags & ATA_FLAG_SW_ACTIVITY))
312 return ap->ops->sw_activity_show(atadev, buf);
313 return -EINVAL;
314 }
315
316 static ssize_t
317 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
318 const char *buf, size_t count)
319 {
320 struct scsi_device *sdev = to_scsi_device(dev);
321 struct ata_port *ap = ata_shost_to_port(sdev->host);
322 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
323 enum sw_activity val;
324 int rc;
325
326 if (ap->ops->sw_activity_store && (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
327 val = simple_strtoul(buf, NULL, 0);
328 switch (val) {
329 case OFF: case BLINK_ON: case BLINK_OFF:
330 rc = ap->ops->sw_activity_store(atadev, val);
331 if (!rc)
332 return count;
333 else
334 return rc;
335 }
336 }
337 return -EINVAL;
338 }
339 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
340 ata_scsi_activity_store);
341 EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
342
343 struct device_attribute *ata_common_sdev_attrs[] = {
344 &dev_attr_unload_heads,
345 NULL
346 };
347 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
348
349 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd)
350 {
351 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
352 /* "Invalid field in cbd" */
353 cmd->scsi_done(cmd);
354 }
355
356 /**
357 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
358 * @sdev: SCSI device for which BIOS geometry is to be determined
359 * @bdev: block device associated with @sdev
360 * @capacity: capacity of SCSI device
361 * @geom: location to which geometry will be output
362 *
363 * Generic bios head/sector/cylinder calculator
364 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
365 * mapping. Some situations may arise where the disk is not
366 * bootable if this is not used.
367 *
368 * LOCKING:
369 * Defined by the SCSI layer. We don't really care.
370 *
371 * RETURNS:
372 * Zero.
373 */
374 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
375 sector_t capacity, int geom[])
376 {
377 geom[0] = 255;
378 geom[1] = 63;
379 sector_div(capacity, 255*63);
380 geom[2] = capacity;
381
382 return 0;
383 }
384
385 /**
386 * ata_scsi_unlock_native_capacity - unlock native capacity
387 * @sdev: SCSI device to adjust device capacity for
388 *
389 * This function is called if a partition on @sdev extends beyond
390 * the end of the device. It requests EH to unlock HPA.
391 *
392 * LOCKING:
393 * Defined by the SCSI layer. Might sleep.
394 */
395 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
396 {
397 struct ata_port *ap = ata_shost_to_port(sdev->host);
398 struct ata_device *dev;
399 unsigned long flags;
400
401 spin_lock_irqsave(ap->lock, flags);
402
403 dev = ata_scsi_find_dev(ap, sdev);
404 if (dev && dev->n_sectors < dev->n_native_sectors) {
405 dev->flags |= ATA_DFLAG_UNLOCK_HPA;
406 dev->link->eh_info.action |= ATA_EH_RESET;
407 ata_port_schedule_eh(ap);
408 }
409
410 spin_unlock_irqrestore(ap->lock, flags);
411 ata_port_wait_eh(ap);
412 }
413
414 /**
415 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
416 * @ap: target port
417 * @sdev: SCSI device to get identify data for
418 * @arg: User buffer area for identify data
419 *
420 * LOCKING:
421 * Defined by the SCSI layer. We don't really care.
422 *
423 * RETURNS:
424 * Zero on success, negative errno on error.
425 */
426 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
427 void __user *arg)
428 {
429 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
430 u16 __user *dst = arg;
431 char buf[40];
432
433 if (!dev)
434 return -ENOMSG;
435
436 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
437 return -EFAULT;
438
439 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
440 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
441 return -EFAULT;
442
443 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
444 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
445 return -EFAULT;
446
447 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
448 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
449 return -EFAULT;
450
451 return 0;
452 }
453
454 /**
455 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
456 * @scsidev: Device to which we are issuing command
457 * @arg: User provided data for issuing command
458 *
459 * LOCKING:
460 * Defined by the SCSI layer. We don't really care.
461 *
462 * RETURNS:
463 * Zero on success, negative errno on error.
464 */
465 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
466 {
467 int rc = 0;
468 u8 scsi_cmd[MAX_COMMAND_SIZE];
469 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
470 int argsize = 0;
471 enum dma_data_direction data_dir;
472 int cmd_result;
473
474 if (arg == NULL)
475 return -EINVAL;
476
477 if (copy_from_user(args, arg, sizeof(args)))
478 return -EFAULT;
479
480 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
481 if (!sensebuf)
482 return -ENOMEM;
483
484 memset(scsi_cmd, 0, sizeof(scsi_cmd));
485
486 if (args[3]) {
487 argsize = ATA_SECT_SIZE * args[3];
488 argbuf = kmalloc(argsize, GFP_KERNEL);
489 if (argbuf == NULL) {
490 rc = -ENOMEM;
491 goto error;
492 }
493
494 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
495 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
496 block count in sector count field */
497 data_dir = DMA_FROM_DEVICE;
498 } else {
499 scsi_cmd[1] = (3 << 1); /* Non-data */
500 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
501 data_dir = DMA_NONE;
502 }
503
504 scsi_cmd[0] = ATA_16;
505
506 scsi_cmd[4] = args[2];
507 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
508 scsi_cmd[6] = args[3];
509 scsi_cmd[8] = args[1];
510 scsi_cmd[10] = 0x4f;
511 scsi_cmd[12] = 0xc2;
512 } else {
513 scsi_cmd[6] = args[1];
514 }
515 scsi_cmd[14] = args[0];
516
517 /* Good values for timeout and retries? Values below
518 from scsi_ioctl_send_command() for default case... */
519 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
520 sensebuf, (10*HZ), 5, 0, NULL);
521
522 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
523 u8 *desc = sensebuf + 8;
524 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
525
526 /* If we set cc then ATA pass-through will cause a
527 * check condition even if no error. Filter that. */
528 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
529 struct scsi_sense_hdr sshdr;
530 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
531 &sshdr);
532 if (sshdr.sense_key == 0 &&
533 sshdr.asc == 0 && sshdr.ascq == 0)
534 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
535 }
536
537 /* Send userspace a few ATA registers (same as drivers/ide) */
538 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
539 desc[0] == 0x09) { /* code is "ATA Descriptor" */
540 args[0] = desc[13]; /* status */
541 args[1] = desc[3]; /* error */
542 args[2] = desc[5]; /* sector count (0:7) */
543 if (copy_to_user(arg, args, sizeof(args)))
544 rc = -EFAULT;
545 }
546 }
547
548
549 if (cmd_result) {
550 rc = -EIO;
551 goto error;
552 }
553
554 if ((argbuf)
555 && copy_to_user(arg + sizeof(args), argbuf, argsize))
556 rc = -EFAULT;
557 error:
558 kfree(sensebuf);
559 kfree(argbuf);
560 return rc;
561 }
562
563 /**
564 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
565 * @scsidev: Device to which we are issuing command
566 * @arg: User provided data for issuing command
567 *
568 * LOCKING:
569 * Defined by the SCSI layer. We don't really care.
570 *
571 * RETURNS:
572 * Zero on success, negative errno on error.
573 */
574 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
575 {
576 int rc = 0;
577 u8 scsi_cmd[MAX_COMMAND_SIZE];
578 u8 args[7], *sensebuf = NULL;
579 int cmd_result;
580
581 if (arg == NULL)
582 return -EINVAL;
583
584 if (copy_from_user(args, arg, sizeof(args)))
585 return -EFAULT;
586
587 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
588 if (!sensebuf)
589 return -ENOMEM;
590
591 memset(scsi_cmd, 0, sizeof(scsi_cmd));
592 scsi_cmd[0] = ATA_16;
593 scsi_cmd[1] = (3 << 1); /* Non-data */
594 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
595 scsi_cmd[4] = args[1];
596 scsi_cmd[6] = args[2];
597 scsi_cmd[8] = args[3];
598 scsi_cmd[10] = args[4];
599 scsi_cmd[12] = args[5];
600 scsi_cmd[13] = args[6] & 0x4f;
601 scsi_cmd[14] = args[0];
602
603 /* Good values for timeout and retries? Values below
604 from scsi_ioctl_send_command() for default case... */
605 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
606 sensebuf, (10*HZ), 5, 0, NULL);
607
608 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
609 u8 *desc = sensebuf + 8;
610 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
611
612 /* If we set cc then ATA pass-through will cause a
613 * check condition even if no error. Filter that. */
614 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
615 struct scsi_sense_hdr sshdr;
616 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
617 &sshdr);
618 if (sshdr.sense_key == 0 &&
619 sshdr.asc == 0 && sshdr.ascq == 0)
620 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
621 }
622
623 /* Send userspace ATA registers */
624 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
625 desc[0] == 0x09) {/* code is "ATA Descriptor" */
626 args[0] = desc[13]; /* status */
627 args[1] = desc[3]; /* error */
628 args[2] = desc[5]; /* sector count (0:7) */
629 args[3] = desc[7]; /* lbal */
630 args[4] = desc[9]; /* lbam */
631 args[5] = desc[11]; /* lbah */
632 args[6] = desc[12]; /* select */
633 if (copy_to_user(arg, args, sizeof(args)))
634 rc = -EFAULT;
635 }
636 }
637
638 if (cmd_result) {
639 rc = -EIO;
640 goto error;
641 }
642
643 error:
644 kfree(sensebuf);
645 return rc;
646 }
647
648 static int ata_ioc32(struct ata_port *ap)
649 {
650 if (ap->flags & ATA_FLAG_PIO_DMA)
651 return 1;
652 if (ap->pflags & ATA_PFLAG_PIO32)
653 return 1;
654 return 0;
655 }
656
657 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
658 int cmd, void __user *arg)
659 {
660 int val = -EINVAL, rc = -EINVAL;
661 unsigned long flags;
662
663 switch (cmd) {
664 case ATA_IOC_GET_IO32:
665 spin_lock_irqsave(ap->lock, flags);
666 val = ata_ioc32(ap);
667 spin_unlock_irqrestore(ap->lock, flags);
668 if (copy_to_user(arg, &val, 1))
669 return -EFAULT;
670 return 0;
671
672 case ATA_IOC_SET_IO32:
673 val = (unsigned long) arg;
674 rc = 0;
675 spin_lock_irqsave(ap->lock, flags);
676 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
677 if (val)
678 ap->pflags |= ATA_PFLAG_PIO32;
679 else
680 ap->pflags &= ~ATA_PFLAG_PIO32;
681 } else {
682 if (val != ata_ioc32(ap))
683 rc = -EINVAL;
684 }
685 spin_unlock_irqrestore(ap->lock, flags);
686 return rc;
687
688 case HDIO_GET_IDENTITY:
689 return ata_get_identity(ap, scsidev, arg);
690
691 case HDIO_DRIVE_CMD:
692 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
693 return -EACCES;
694 return ata_cmd_ioctl(scsidev, arg);
695
696 case HDIO_DRIVE_TASK:
697 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
698 return -EACCES;
699 return ata_task_ioctl(scsidev, arg);
700
701 default:
702 rc = -ENOTTY;
703 break;
704 }
705
706 return rc;
707 }
708 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
709
710 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
711 {
712 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
713 scsidev, cmd, arg);
714 }
715 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
716
717 /**
718 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
719 * @dev: ATA device to which the new command is attached
720 * @cmd: SCSI command that originated this ATA command
721 *
722 * Obtain a reference to an unused ata_queued_cmd structure,
723 * which is the basic libata structure representing a single
724 * ATA command sent to the hardware.
725 *
726 * If a command was available, fill in the SCSI-specific
727 * portions of the structure with information on the
728 * current command.
729 *
730 * LOCKING:
731 * spin_lock_irqsave(host lock)
732 *
733 * RETURNS:
734 * Command allocated, or %NULL if none available.
735 */
736 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
737 struct scsi_cmnd *cmd)
738 {
739 struct ata_queued_cmd *qc;
740
741 qc = ata_qc_new_init(dev);
742 if (qc) {
743 qc->scsicmd = cmd;
744 qc->scsidone = cmd->scsi_done;
745
746 qc->sg = scsi_sglist(cmd);
747 qc->n_elem = scsi_sg_count(cmd);
748 } else {
749 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
750 cmd->scsi_done(cmd);
751 }
752
753 return qc;
754 }
755
756 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
757 {
758 struct scsi_cmnd *scmd = qc->scsicmd;
759
760 qc->extrabytes = scmd->request->extra_len;
761 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
762 }
763
764 /**
765 * ata_dump_status - user friendly display of error info
766 * @id: id of the port in question
767 * @tf: ptr to filled out taskfile
768 *
769 * Decode and dump the ATA error/status registers for the user so
770 * that they have some idea what really happened at the non
771 * make-believe layer.
772 *
773 * LOCKING:
774 * inherited from caller
775 */
776 static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
777 {
778 u8 stat = tf->command, err = tf->feature;
779
780 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
781 if (stat & ATA_BUSY) {
782 printk("Busy }\n"); /* Data is not valid in this case */
783 } else {
784 if (stat & 0x40) printk("DriveReady ");
785 if (stat & 0x20) printk("DeviceFault ");
786 if (stat & 0x10) printk("SeekComplete ");
787 if (stat & 0x08) printk("DataRequest ");
788 if (stat & 0x04) printk("CorrectedError ");
789 if (stat & 0x02) printk("Index ");
790 if (stat & 0x01) printk("Error ");
791 printk("}\n");
792
793 if (err) {
794 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
795 if (err & 0x04) printk("DriveStatusError ");
796 if (err & 0x80) {
797 if (err & 0x04) printk("BadCRC ");
798 else printk("Sector ");
799 }
800 if (err & 0x40) printk("UncorrectableError ");
801 if (err & 0x10) printk("SectorIdNotFound ");
802 if (err & 0x02) printk("TrackZeroNotFound ");
803 if (err & 0x01) printk("AddrMarkNotFound ");
804 printk("}\n");
805 }
806 }
807 }
808
809 /**
810 * ata_to_sense_error - convert ATA error to SCSI error
811 * @id: ATA device number
812 * @drv_stat: value contained in ATA status register
813 * @drv_err: value contained in ATA error register
814 * @sk: the sense key we'll fill out
815 * @asc: the additional sense code we'll fill out
816 * @ascq: the additional sense code qualifier we'll fill out
817 * @verbose: be verbose
818 *
819 * Converts an ATA error into a SCSI error. Fill out pointers to
820 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
821 * format sense blocks.
822 *
823 * LOCKING:
824 * spin_lock_irqsave(host lock)
825 */
826 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
827 u8 *asc, u8 *ascq, int verbose)
828 {
829 int i;
830
831 /* Based on the 3ware driver translation table */
832 static const unsigned char sense_table[][4] = {
833 /* BBD|ECC|ID|MAR */
834 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
835 /* BBD|ECC|ID */
836 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
837 /* ECC|MC|MARK */
838 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
839 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
840 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
841 /* MC|ID|ABRT|TRK0|MARK */
842 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
843 /* MCR|MARK */
844 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
845 /* Bad address mark */
846 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
847 /* TRK0 */
848 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
849 /* Abort & !ICRC */
850 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
851 /* Media change request */
852 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
853 /* SRV */
854 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
855 /* Media change */
856 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
857 /* ECC */
858 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
859 /* BBD - block marked bad */
860 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
861 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
862 };
863 static const unsigned char stat_table[][4] = {
864 /* Must be first because BUSY means no other bits valid */
865 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
866 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
867 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
868 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
869 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
870 };
871
872 /*
873 * Is this an error we can process/parse
874 */
875 if (drv_stat & ATA_BUSY) {
876 drv_err = 0; /* Ignore the err bits, they're invalid */
877 }
878
879 if (drv_err) {
880 /* Look for drv_err */
881 for (i = 0; sense_table[i][0] != 0xFF; i++) {
882 /* Look for best matches first */
883 if ((sense_table[i][0] & drv_err) ==
884 sense_table[i][0]) {
885 *sk = sense_table[i][1];
886 *asc = sense_table[i][2];
887 *ascq = sense_table[i][3];
888 goto translate_done;
889 }
890 }
891 /* No immediate match */
892 if (verbose)
893 printk(KERN_WARNING "ata%u: no sense translation for "
894 "error 0x%02x\n", id, drv_err);
895 }
896
897 /* Fall back to interpreting status bits */
898 for (i = 0; stat_table[i][0] != 0xFF; i++) {
899 if (stat_table[i][0] & drv_stat) {
900 *sk = stat_table[i][1];
901 *asc = stat_table[i][2];
902 *ascq = stat_table[i][3];
903 goto translate_done;
904 }
905 }
906 /* No error? Undecoded? */
907 if (verbose)
908 printk(KERN_WARNING "ata%u: no sense translation for "
909 "status: 0x%02x\n", id, drv_stat);
910
911 /* We need a sensible error return here, which is tricky, and one
912 that won't cause people to do things like return a disk wrongly */
913 *sk = ABORTED_COMMAND;
914 *asc = 0x00;
915 *ascq = 0x00;
916
917 translate_done:
918 if (verbose)
919 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
920 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
921 id, drv_stat, drv_err, *sk, *asc, *ascq);
922 return;
923 }
924
925 /*
926 * ata_gen_passthru_sense - Generate check condition sense block.
927 * @qc: Command that completed.
928 *
929 * This function is specific to the ATA descriptor format sense
930 * block specified for the ATA pass through commands. Regardless
931 * of whether the command errored or not, return a sense
932 * block. Copy all controller registers into the sense
933 * block. Clear sense key, ASC & ASCQ if there is no error.
934 *
935 * LOCKING:
936 * None.
937 */
938 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
939 {
940 struct scsi_cmnd *cmd = qc->scsicmd;
941 struct ata_taskfile *tf = &qc->result_tf;
942 unsigned char *sb = cmd->sense_buffer;
943 unsigned char *desc = sb + 8;
944 int verbose = qc->ap->ops->error_handler == NULL;
945
946 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
947
948 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
949
950 /*
951 * Use ata_to_sense_error() to map status register bits
952 * onto sense key, asc & ascq.
953 */
954 if (qc->err_mask ||
955 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
956 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
957 &sb[1], &sb[2], &sb[3], verbose);
958 sb[1] &= 0x0f;
959 }
960
961 /*
962 * Sense data is current and format is descriptor.
963 */
964 sb[0] = 0x72;
965
966 desc[0] = 0x09;
967
968 /* set length of additional sense data */
969 sb[7] = 14;
970 desc[1] = 12;
971
972 /*
973 * Copy registers into sense buffer.
974 */
975 desc[2] = 0x00;
976 desc[3] = tf->feature; /* == error reg */
977 desc[5] = tf->nsect;
978 desc[7] = tf->lbal;
979 desc[9] = tf->lbam;
980 desc[11] = tf->lbah;
981 desc[12] = tf->device;
982 desc[13] = tf->command; /* == status reg */
983
984 /*
985 * Fill in Extend bit, and the high order bytes
986 * if applicable.
987 */
988 if (tf->flags & ATA_TFLAG_LBA48) {
989 desc[2] |= 0x01;
990 desc[4] = tf->hob_nsect;
991 desc[6] = tf->hob_lbal;
992 desc[8] = tf->hob_lbam;
993 desc[10] = tf->hob_lbah;
994 }
995 }
996
997 /**
998 * ata_gen_ata_sense - generate a SCSI fixed sense block
999 * @qc: Command that we are erroring out
1000 *
1001 * Generate sense block for a failed ATA command @qc. Descriptor
1002 * format is used to accomodate LBA48 block address.
1003 *
1004 * LOCKING:
1005 * None.
1006 */
1007 static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
1008 {
1009 struct ata_device *dev = qc->dev;
1010 struct scsi_cmnd *cmd = qc->scsicmd;
1011 struct ata_taskfile *tf = &qc->result_tf;
1012 unsigned char *sb = cmd->sense_buffer;
1013 unsigned char *desc = sb + 8;
1014 int verbose = qc->ap->ops->error_handler == NULL;
1015 u64 block;
1016
1017 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1018
1019 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
1020
1021 /* sense data is current and format is descriptor */
1022 sb[0] = 0x72;
1023
1024 /* Use ata_to_sense_error() to map status register bits
1025 * onto sense key, asc & ascq.
1026 */
1027 if (qc->err_mask ||
1028 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
1029 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
1030 &sb[1], &sb[2], &sb[3], verbose);
1031 sb[1] &= 0x0f;
1032 }
1033
1034 block = ata_tf_read_block(&qc->result_tf, dev);
1035
1036 /* information sense data descriptor */
1037 sb[7] = 12;
1038 desc[0] = 0x00;
1039 desc[1] = 10;
1040
1041 desc[2] |= 0x80; /* valid */
1042 desc[6] = block >> 40;
1043 desc[7] = block >> 32;
1044 desc[8] = block >> 24;
1045 desc[9] = block >> 16;
1046 desc[10] = block >> 8;
1047 desc[11] = block;
1048 }
1049
1050 static void ata_scsi_sdev_config(struct scsi_device *sdev)
1051 {
1052 sdev->use_10_for_rw = 1;
1053 sdev->use_10_for_ms = 1;
1054
1055 /* Schedule policy is determined by ->qc_defer() callback and
1056 * it needs to see every deferred qc. Set dev_blocked to 1 to
1057 * prevent SCSI midlayer from automatically deferring
1058 * requests.
1059 */
1060 sdev->max_device_blocked = 1;
1061 }
1062
1063 /**
1064 * atapi_drain_needed - Check whether data transfer may overflow
1065 * @rq: request to be checked
1066 *
1067 * ATAPI commands which transfer variable length data to host
1068 * might overflow due to application error or hardare bug. This
1069 * function checks whether overflow should be drained and ignored
1070 * for @request.
1071 *
1072 * LOCKING:
1073 * None.
1074 *
1075 * RETURNS:
1076 * 1 if ; otherwise, 0.
1077 */
1078 static int atapi_drain_needed(struct request *rq)
1079 {
1080 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
1081 return 0;
1082
1083 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
1084 return 0;
1085
1086 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1087 }
1088
1089 static int ata_scsi_dev_config(struct scsi_device *sdev,
1090 struct ata_device *dev)
1091 {
1092 if (!ata_id_has_unload(dev->id))
1093 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1094
1095 /* configure max sectors */
1096 blk_queue_max_hw_sectors(sdev->request_queue, dev->max_sectors);
1097
1098 if (dev->class == ATA_DEV_ATAPI) {
1099 struct request_queue *q = sdev->request_queue;
1100 void *buf;
1101
1102 sdev->sector_size = ATA_SECT_SIZE;
1103
1104 /* set DMA padding */
1105 blk_queue_update_dma_pad(sdev->request_queue,
1106 ATA_DMA_PAD_SZ - 1);
1107
1108 /* configure draining */
1109 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1110 if (!buf) {
1111 ata_dev_printk(dev, KERN_ERR,
1112 "drain buffer allocation failed\n");
1113 return -ENOMEM;
1114 }
1115
1116 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1117 } else {
1118 sdev->sector_size = ata_id_logical_sector_size(dev->id);
1119 sdev->manage_start_stop = 1;
1120 }
1121
1122 /*
1123 * ata_pio_sectors() expects buffer for each sector to not cross
1124 * page boundary. Enforce it by requiring buffers to be sector
1125 * aligned, which works iff sector_size is not larger than
1126 * PAGE_SIZE. ATAPI devices also need the alignment as
1127 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1128 */
1129 if (sdev->sector_size > PAGE_SIZE)
1130 ata_dev_printk(dev, KERN_WARNING,
1131 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1132 sdev->sector_size);
1133
1134 blk_queue_update_dma_alignment(sdev->request_queue,
1135 sdev->sector_size - 1);
1136
1137 if (dev->flags & ATA_DFLAG_AN)
1138 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1139
1140 if (dev->flags & ATA_DFLAG_NCQ) {
1141 int depth;
1142
1143 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1144 depth = min(ATA_MAX_QUEUE - 1, depth);
1145 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
1146 }
1147
1148 dev->sdev = sdev;
1149 return 0;
1150 }
1151
1152 /**
1153 * ata_scsi_slave_config - Set SCSI device attributes
1154 * @sdev: SCSI device to examine
1155 *
1156 * This is called before we actually start reading
1157 * and writing to the device, to configure certain
1158 * SCSI mid-layer behaviors.
1159 *
1160 * LOCKING:
1161 * Defined by SCSI layer. We don't really care.
1162 */
1163
1164 int ata_scsi_slave_config(struct scsi_device *sdev)
1165 {
1166 struct ata_port *ap = ata_shost_to_port(sdev->host);
1167 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1168 int rc = 0;
1169
1170 ata_scsi_sdev_config(sdev);
1171
1172 if (dev)
1173 rc = ata_scsi_dev_config(sdev, dev);
1174
1175 return rc;
1176 }
1177
1178 /**
1179 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1180 * @sdev: SCSI device to be destroyed
1181 *
1182 * @sdev is about to be destroyed for hot/warm unplugging. If
1183 * this unplugging was initiated by libata as indicated by NULL
1184 * dev->sdev, this function doesn't have to do anything.
1185 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1186 * Clear dev->sdev, schedule the device for ATA detach and invoke
1187 * EH.
1188 *
1189 * LOCKING:
1190 * Defined by SCSI layer. We don't really care.
1191 */
1192 void ata_scsi_slave_destroy(struct scsi_device *sdev)
1193 {
1194 struct ata_port *ap = ata_shost_to_port(sdev->host);
1195 struct request_queue *q = sdev->request_queue;
1196 unsigned long flags;
1197 struct ata_device *dev;
1198
1199 if (!ap->ops->error_handler)
1200 return;
1201
1202 spin_lock_irqsave(ap->lock, flags);
1203 dev = __ata_scsi_find_dev(ap, sdev);
1204 if (dev && dev->sdev) {
1205 /* SCSI device already in CANCEL state, no need to offline it */
1206 dev->sdev = NULL;
1207 dev->flags |= ATA_DFLAG_DETACH;
1208 ata_port_schedule_eh(ap);
1209 }
1210 spin_unlock_irqrestore(ap->lock, flags);
1211
1212 kfree(q->dma_drain_buffer);
1213 q->dma_drain_buffer = NULL;
1214 q->dma_drain_size = 0;
1215 }
1216
1217 /**
1218 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1219 * @sdev: SCSI device to configure queue depth for
1220 * @queue_depth: new queue depth
1221 * @reason: calling context
1222 *
1223 * This is libata standard hostt->change_queue_depth callback.
1224 * SCSI will call into this callback when user tries to set queue
1225 * depth via sysfs.
1226 *
1227 * LOCKING:
1228 * SCSI layer (we don't care)
1229 *
1230 * RETURNS:
1231 * Newly configured queue depth.
1232 */
1233 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth,
1234 int reason)
1235 {
1236 struct ata_port *ap = ata_shost_to_port(sdev->host);
1237 struct ata_device *dev;
1238 unsigned long flags;
1239
1240 if (reason != SCSI_QDEPTH_DEFAULT)
1241 return -EOPNOTSUPP;
1242
1243 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1244 return sdev->queue_depth;
1245
1246 dev = ata_scsi_find_dev(ap, sdev);
1247 if (!dev || !ata_dev_enabled(dev))
1248 return sdev->queue_depth;
1249
1250 /* NCQ enabled? */
1251 spin_lock_irqsave(ap->lock, flags);
1252 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1253 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1254 dev->flags |= ATA_DFLAG_NCQ_OFF;
1255 queue_depth = 1;
1256 }
1257 spin_unlock_irqrestore(ap->lock, flags);
1258
1259 /* limit and apply queue depth */
1260 queue_depth = min(queue_depth, sdev->host->can_queue);
1261 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1262 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1263
1264 if (sdev->queue_depth == queue_depth)
1265 return -EINVAL;
1266
1267 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
1268 return queue_depth;
1269 }
1270
1271 /**
1272 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1273 * @qc: Storage for translated ATA taskfile
1274 *
1275 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1276 * (to start). Perhaps these commands should be preceded by
1277 * CHECK POWER MODE to see what power mode the device is already in.
1278 * [See SAT revision 5 at www.t10.org]
1279 *
1280 * LOCKING:
1281 * spin_lock_irqsave(host lock)
1282 *
1283 * RETURNS:
1284 * Zero on success, non-zero on error.
1285 */
1286 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1287 {
1288 struct scsi_cmnd *scmd = qc->scsicmd;
1289 struct ata_taskfile *tf = &qc->tf;
1290 const u8 *cdb = scmd->cmnd;
1291
1292 if (scmd->cmd_len < 5)
1293 goto invalid_fld;
1294
1295 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1296 tf->protocol = ATA_PROT_NODATA;
1297 if (cdb[1] & 0x1) {
1298 ; /* ignore IMMED bit, violates sat-r05 */
1299 }
1300 if (cdb[4] & 0x2)
1301 goto invalid_fld; /* LOEJ bit set not supported */
1302 if (((cdb[4] >> 4) & 0xf) != 0)
1303 goto invalid_fld; /* power conditions not supported */
1304
1305 if (cdb[4] & 0x1) {
1306 tf->nsect = 1; /* 1 sector, lba=0 */
1307
1308 if (qc->dev->flags & ATA_DFLAG_LBA) {
1309 tf->flags |= ATA_TFLAG_LBA;
1310
1311 tf->lbah = 0x0;
1312 tf->lbam = 0x0;
1313 tf->lbal = 0x0;
1314 tf->device |= ATA_LBA;
1315 } else {
1316 /* CHS */
1317 tf->lbal = 0x1; /* sect */
1318 tf->lbam = 0x0; /* cyl low */
1319 tf->lbah = 0x0; /* cyl high */
1320 }
1321
1322 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
1323 } else {
1324 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1325 * or S5) causing some drives to spin up and down again.
1326 */
1327 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1328 system_state == SYSTEM_POWER_OFF)
1329 goto skip;
1330
1331 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1332 system_entering_hibernation())
1333 goto skip;
1334
1335 /* Issue ATA STANDBY IMMEDIATE command */
1336 tf->command = ATA_CMD_STANDBYNOW1;
1337 }
1338
1339 /*
1340 * Standby and Idle condition timers could be implemented but that
1341 * would require libata to implement the Power condition mode page
1342 * and allow the user to change it. Changing mode pages requires
1343 * MODE SELECT to be implemented.
1344 */
1345
1346 return 0;
1347
1348 invalid_fld:
1349 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1350 /* "Invalid field in cbd" */
1351 return 1;
1352 skip:
1353 scmd->result = SAM_STAT_GOOD;
1354 return 1;
1355 }
1356
1357
1358 /**
1359 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1360 * @qc: Storage for translated ATA taskfile
1361 *
1362 * Sets up an ATA taskfile to issue FLUSH CACHE or
1363 * FLUSH CACHE EXT.
1364 *
1365 * LOCKING:
1366 * spin_lock_irqsave(host lock)
1367 *
1368 * RETURNS:
1369 * Zero on success, non-zero on error.
1370 */
1371 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1372 {
1373 struct ata_taskfile *tf = &qc->tf;
1374
1375 tf->flags |= ATA_TFLAG_DEVICE;
1376 tf->protocol = ATA_PROT_NODATA;
1377
1378 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1379 tf->command = ATA_CMD_FLUSH_EXT;
1380 else
1381 tf->command = ATA_CMD_FLUSH;
1382
1383 /* flush is critical for IO integrity, consider it an IO command */
1384 qc->flags |= ATA_QCFLAG_IO;
1385
1386 return 0;
1387 }
1388
1389 /**
1390 * scsi_6_lba_len - Get LBA and transfer length
1391 * @cdb: SCSI command to translate
1392 *
1393 * Calculate LBA and transfer length for 6-byte commands.
1394 *
1395 * RETURNS:
1396 * @plba: the LBA
1397 * @plen: the transfer length
1398 */
1399 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1400 {
1401 u64 lba = 0;
1402 u32 len;
1403
1404 VPRINTK("six-byte command\n");
1405
1406 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1407 lba |= ((u64)cdb[2]) << 8;
1408 lba |= ((u64)cdb[3]);
1409
1410 len = cdb[4];
1411
1412 *plba = lba;
1413 *plen = len;
1414 }
1415
1416 /**
1417 * scsi_10_lba_len - Get LBA and transfer length
1418 * @cdb: SCSI command to translate
1419 *
1420 * Calculate LBA and transfer length for 10-byte commands.
1421 *
1422 * RETURNS:
1423 * @plba: the LBA
1424 * @plen: the transfer length
1425 */
1426 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1427 {
1428 u64 lba = 0;
1429 u32 len = 0;
1430
1431 VPRINTK("ten-byte command\n");
1432
1433 lba |= ((u64)cdb[2]) << 24;
1434 lba |= ((u64)cdb[3]) << 16;
1435 lba |= ((u64)cdb[4]) << 8;
1436 lba |= ((u64)cdb[5]);
1437
1438 len |= ((u32)cdb[7]) << 8;
1439 len |= ((u32)cdb[8]);
1440
1441 *plba = lba;
1442 *plen = len;
1443 }
1444
1445 /**
1446 * scsi_16_lba_len - Get LBA and transfer length
1447 * @cdb: SCSI command to translate
1448 *
1449 * Calculate LBA and transfer length for 16-byte commands.
1450 *
1451 * RETURNS:
1452 * @plba: the LBA
1453 * @plen: the transfer length
1454 */
1455 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1456 {
1457 u64 lba = 0;
1458 u32 len = 0;
1459
1460 VPRINTK("sixteen-byte command\n");
1461
1462 lba |= ((u64)cdb[2]) << 56;
1463 lba |= ((u64)cdb[3]) << 48;
1464 lba |= ((u64)cdb[4]) << 40;
1465 lba |= ((u64)cdb[5]) << 32;
1466 lba |= ((u64)cdb[6]) << 24;
1467 lba |= ((u64)cdb[7]) << 16;
1468 lba |= ((u64)cdb[8]) << 8;
1469 lba |= ((u64)cdb[9]);
1470
1471 len |= ((u32)cdb[10]) << 24;
1472 len |= ((u32)cdb[11]) << 16;
1473 len |= ((u32)cdb[12]) << 8;
1474 len |= ((u32)cdb[13]);
1475
1476 *plba = lba;
1477 *plen = len;
1478 }
1479
1480 /**
1481 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1482 * @qc: Storage for translated ATA taskfile
1483 *
1484 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1485 *
1486 * LOCKING:
1487 * spin_lock_irqsave(host lock)
1488 *
1489 * RETURNS:
1490 * Zero on success, non-zero on error.
1491 */
1492 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1493 {
1494 struct scsi_cmnd *scmd = qc->scsicmd;
1495 struct ata_taskfile *tf = &qc->tf;
1496 struct ata_device *dev = qc->dev;
1497 u64 dev_sectors = qc->dev->n_sectors;
1498 const u8 *cdb = scmd->cmnd;
1499 u64 block;
1500 u32 n_block;
1501
1502 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1503 tf->protocol = ATA_PROT_NODATA;
1504
1505 if (cdb[0] == VERIFY) {
1506 if (scmd->cmd_len < 10)
1507 goto invalid_fld;
1508 scsi_10_lba_len(cdb, &block, &n_block);
1509 } else if (cdb[0] == VERIFY_16) {
1510 if (scmd->cmd_len < 16)
1511 goto invalid_fld;
1512 scsi_16_lba_len(cdb, &block, &n_block);
1513 } else
1514 goto invalid_fld;
1515
1516 if (!n_block)
1517 goto nothing_to_do;
1518 if (block >= dev_sectors)
1519 goto out_of_range;
1520 if ((block + n_block) > dev_sectors)
1521 goto out_of_range;
1522
1523 if (dev->flags & ATA_DFLAG_LBA) {
1524 tf->flags |= ATA_TFLAG_LBA;
1525
1526 if (lba_28_ok(block, n_block)) {
1527 /* use LBA28 */
1528 tf->command = ATA_CMD_VERIFY;
1529 tf->device |= (block >> 24) & 0xf;
1530 } else if (lba_48_ok(block, n_block)) {
1531 if (!(dev->flags & ATA_DFLAG_LBA48))
1532 goto out_of_range;
1533
1534 /* use LBA48 */
1535 tf->flags |= ATA_TFLAG_LBA48;
1536 tf->command = ATA_CMD_VERIFY_EXT;
1537
1538 tf->hob_nsect = (n_block >> 8) & 0xff;
1539
1540 tf->hob_lbah = (block >> 40) & 0xff;
1541 tf->hob_lbam = (block >> 32) & 0xff;
1542 tf->hob_lbal = (block >> 24) & 0xff;
1543 } else
1544 /* request too large even for LBA48 */
1545 goto out_of_range;
1546
1547 tf->nsect = n_block & 0xff;
1548
1549 tf->lbah = (block >> 16) & 0xff;
1550 tf->lbam = (block >> 8) & 0xff;
1551 tf->lbal = block & 0xff;
1552
1553 tf->device |= ATA_LBA;
1554 } else {
1555 /* CHS */
1556 u32 sect, head, cyl, track;
1557
1558 if (!lba_28_ok(block, n_block))
1559 goto out_of_range;
1560
1561 /* Convert LBA to CHS */
1562 track = (u32)block / dev->sectors;
1563 cyl = track / dev->heads;
1564 head = track % dev->heads;
1565 sect = (u32)block % dev->sectors + 1;
1566
1567 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1568 (u32)block, track, cyl, head, sect);
1569
1570 /* Check whether the converted CHS can fit.
1571 Cylinder: 0-65535
1572 Head: 0-15
1573 Sector: 1-255*/
1574 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1575 goto out_of_range;
1576
1577 tf->command = ATA_CMD_VERIFY;
1578 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1579 tf->lbal = sect;
1580 tf->lbam = cyl;
1581 tf->lbah = cyl >> 8;
1582 tf->device |= head;
1583 }
1584
1585 return 0;
1586
1587 invalid_fld:
1588 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1589 /* "Invalid field in cbd" */
1590 return 1;
1591
1592 out_of_range:
1593 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1594 /* "Logical Block Address out of range" */
1595 return 1;
1596
1597 nothing_to_do:
1598 scmd->result = SAM_STAT_GOOD;
1599 return 1;
1600 }
1601
1602 /**
1603 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1604 * @qc: Storage for translated ATA taskfile
1605 *
1606 * Converts any of six SCSI read/write commands into the
1607 * ATA counterpart, including starting sector (LBA),
1608 * sector count, and taking into account the device's LBA48
1609 * support.
1610 *
1611 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1612 * %WRITE_16 are currently supported.
1613 *
1614 * LOCKING:
1615 * spin_lock_irqsave(host lock)
1616 *
1617 * RETURNS:
1618 * Zero on success, non-zero on error.
1619 */
1620 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1621 {
1622 struct scsi_cmnd *scmd = qc->scsicmd;
1623 const u8 *cdb = scmd->cmnd;
1624 unsigned int tf_flags = 0;
1625 u64 block;
1626 u32 n_block;
1627 int rc;
1628
1629 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1630 tf_flags |= ATA_TFLAG_WRITE;
1631
1632 /* Calculate the SCSI LBA, transfer length and FUA. */
1633 switch (cdb[0]) {
1634 case READ_10:
1635 case WRITE_10:
1636 if (unlikely(scmd->cmd_len < 10))
1637 goto invalid_fld;
1638 scsi_10_lba_len(cdb, &block, &n_block);
1639 if (unlikely(cdb[1] & (1 << 3)))
1640 tf_flags |= ATA_TFLAG_FUA;
1641 break;
1642 case READ_6:
1643 case WRITE_6:
1644 if (unlikely(scmd->cmd_len < 6))
1645 goto invalid_fld;
1646 scsi_6_lba_len(cdb, &block, &n_block);
1647
1648 /* for 6-byte r/w commands, transfer length 0
1649 * means 256 blocks of data, not 0 block.
1650 */
1651 if (!n_block)
1652 n_block = 256;
1653 break;
1654 case READ_16:
1655 case WRITE_16:
1656 if (unlikely(scmd->cmd_len < 16))
1657 goto invalid_fld;
1658 scsi_16_lba_len(cdb, &block, &n_block);
1659 if (unlikely(cdb[1] & (1 << 3)))
1660 tf_flags |= ATA_TFLAG_FUA;
1661 break;
1662 default:
1663 DPRINTK("no-byte command\n");
1664 goto invalid_fld;
1665 }
1666
1667 /* Check and compose ATA command */
1668 if (!n_block)
1669 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1670 * length 0 means transfer 0 block of data.
1671 * However, for ATA R/W commands, sector count 0 means
1672 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1673 *
1674 * WARNING: one or two older ATA drives treat 0 as 0...
1675 */
1676 goto nothing_to_do;
1677
1678 qc->flags |= ATA_QCFLAG_IO;
1679 qc->nbytes = n_block * scmd->device->sector_size;
1680
1681 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1682 qc->tag);
1683 if (likely(rc == 0))
1684 return 0;
1685
1686 if (rc == -ERANGE)
1687 goto out_of_range;
1688 /* treat all other errors as -EINVAL, fall through */
1689 invalid_fld:
1690 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1691 /* "Invalid field in cbd" */
1692 return 1;
1693
1694 out_of_range:
1695 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1696 /* "Logical Block Address out of range" */
1697 return 1;
1698
1699 nothing_to_do:
1700 scmd->result = SAM_STAT_GOOD;
1701 return 1;
1702 }
1703
1704 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1705 {
1706 struct ata_port *ap = qc->ap;
1707 struct scsi_cmnd *cmd = qc->scsicmd;
1708 u8 *cdb = cmd->cmnd;
1709 int need_sense = (qc->err_mask != 0);
1710
1711 /* For ATA pass thru (SAT) commands, generate a sense block if
1712 * user mandated it or if there's an error. Note that if we
1713 * generate because the user forced us to, a check condition
1714 * is generated and the ATA register values are returned
1715 * whether the command completed successfully or not. If there
1716 * was no error, SK, ASC and ASCQ will all be zero.
1717 */
1718 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1719 ((cdb[2] & 0x20) || need_sense)) {
1720 ata_gen_passthru_sense(qc);
1721 } else {
1722 if (!need_sense) {
1723 cmd->result = SAM_STAT_GOOD;
1724 } else {
1725 /* TODO: decide which descriptor format to use
1726 * for 48b LBA devices and call that here
1727 * instead of the fixed desc, which is only
1728 * good for smaller LBA (and maybe CHS?)
1729 * devices.
1730 */
1731 ata_gen_ata_sense(qc);
1732 }
1733 }
1734
1735 if (need_sense && !ap->ops->error_handler)
1736 ata_dump_status(ap->print_id, &qc->result_tf);
1737
1738 qc->scsidone(cmd);
1739
1740 ata_qc_free(qc);
1741 }
1742
1743 /**
1744 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1745 * @dev: ATA device to which the command is addressed
1746 * @cmd: SCSI command to execute
1747 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1748 *
1749 * Our ->queuecommand() function has decided that the SCSI
1750 * command issued can be directly translated into an ATA
1751 * command, rather than handled internally.
1752 *
1753 * This function sets up an ata_queued_cmd structure for the
1754 * SCSI command, and sends that ata_queued_cmd to the hardware.
1755 *
1756 * The xlat_func argument (actor) returns 0 if ready to execute
1757 * ATA command, else 1 to finish translation. If 1 is returned
1758 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1759 * to be set reflecting an error condition or clean (early)
1760 * termination.
1761 *
1762 * LOCKING:
1763 * spin_lock_irqsave(host lock)
1764 *
1765 * RETURNS:
1766 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1767 * needs to be deferred.
1768 */
1769 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1770 ata_xlat_func_t xlat_func)
1771 {
1772 struct ata_port *ap = dev->link->ap;
1773 struct ata_queued_cmd *qc;
1774 int rc;
1775
1776 VPRINTK("ENTER\n");
1777
1778 qc = ata_scsi_qc_new(dev, cmd);
1779 if (!qc)
1780 goto err_mem;
1781
1782 /* data is present; dma-map it */
1783 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1784 cmd->sc_data_direction == DMA_TO_DEVICE) {
1785 if (unlikely(scsi_bufflen(cmd) < 1)) {
1786 ata_dev_printk(dev, KERN_WARNING,
1787 "WARNING: zero len r/w req\n");
1788 goto err_did;
1789 }
1790
1791 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1792
1793 qc->dma_dir = cmd->sc_data_direction;
1794 }
1795
1796 qc->complete_fn = ata_scsi_qc_complete;
1797
1798 if (xlat_func(qc))
1799 goto early_finish;
1800
1801 if (ap->ops->qc_defer) {
1802 if ((rc = ap->ops->qc_defer(qc)))
1803 goto defer;
1804 }
1805
1806 /* select device, send command to hardware */
1807 ata_qc_issue(qc);
1808
1809 VPRINTK("EXIT\n");
1810 return 0;
1811
1812 early_finish:
1813 ata_qc_free(qc);
1814 cmd->scsi_done(cmd);
1815 DPRINTK("EXIT - early finish (good or error)\n");
1816 return 0;
1817
1818 err_did:
1819 ata_qc_free(qc);
1820 cmd->result = (DID_ERROR << 16);
1821 cmd->scsi_done(cmd);
1822 err_mem:
1823 DPRINTK("EXIT - internal\n");
1824 return 0;
1825
1826 defer:
1827 ata_qc_free(qc);
1828 DPRINTK("EXIT - defer\n");
1829 if (rc == ATA_DEFER_LINK)
1830 return SCSI_MLQUEUE_DEVICE_BUSY;
1831 else
1832 return SCSI_MLQUEUE_HOST_BUSY;
1833 }
1834
1835 /**
1836 * ata_scsi_rbuf_get - Map response buffer.
1837 * @cmd: SCSI command containing buffer to be mapped.
1838 * @flags: unsigned long variable to store irq enable status
1839 * @copy_in: copy in from user buffer
1840 *
1841 * Prepare buffer for simulated SCSI commands.
1842 *
1843 * LOCKING:
1844 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1845 *
1846 * RETURNS:
1847 * Pointer to response buffer.
1848 */
1849 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1850 unsigned long *flags)
1851 {
1852 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1853
1854 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1855 if (copy_in)
1856 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1857 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1858 return ata_scsi_rbuf;
1859 }
1860
1861 /**
1862 * ata_scsi_rbuf_put - Unmap response buffer.
1863 * @cmd: SCSI command containing buffer to be unmapped.
1864 * @copy_out: copy out result
1865 * @flags: @flags passed to ata_scsi_rbuf_get()
1866 *
1867 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1868 * @copy_back is true.
1869 *
1870 * LOCKING:
1871 * Unlocks ata_scsi_rbuf_lock.
1872 */
1873 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1874 unsigned long *flags)
1875 {
1876 if (copy_out)
1877 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1878 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1879 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1880 }
1881
1882 /**
1883 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1884 * @args: device IDENTIFY data / SCSI command of interest.
1885 * @actor: Callback hook for desired SCSI command simulator
1886 *
1887 * Takes care of the hard work of simulating a SCSI command...
1888 * Mapping the response buffer, calling the command's handler,
1889 * and handling the handler's return value. This return value
1890 * indicates whether the handler wishes the SCSI command to be
1891 * completed successfully (0), or not (in which case cmd->result
1892 * and sense buffer are assumed to be set).
1893 *
1894 * LOCKING:
1895 * spin_lock_irqsave(host lock)
1896 */
1897 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1898 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1899 {
1900 u8 *rbuf;
1901 unsigned int rc;
1902 struct scsi_cmnd *cmd = args->cmd;
1903 unsigned long flags;
1904
1905 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1906 rc = actor(args, rbuf);
1907 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
1908
1909 if (rc == 0)
1910 cmd->result = SAM_STAT_GOOD;
1911 args->done(cmd);
1912 }
1913
1914 /**
1915 * ata_scsiop_inq_std - Simulate INQUIRY command
1916 * @args: device IDENTIFY data / SCSI command of interest.
1917 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1918 *
1919 * Returns standard device identification data associated
1920 * with non-VPD INQUIRY command output.
1921 *
1922 * LOCKING:
1923 * spin_lock_irqsave(host lock)
1924 */
1925 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1926 {
1927 const u8 versions[] = {
1928 0x60, /* SAM-3 (no version claimed) */
1929
1930 0x03,
1931 0x20, /* SBC-2 (no version claimed) */
1932
1933 0x02,
1934 0x60 /* SPC-3 (no version claimed) */
1935 };
1936 u8 hdr[] = {
1937 TYPE_DISK,
1938 0,
1939 0x5, /* claim SPC-3 version compatibility */
1940 2,
1941 95 - 4
1942 };
1943
1944 VPRINTK("ENTER\n");
1945
1946 /* set scsi removeable (RMB) bit per ata bit */
1947 if (ata_id_removeable(args->id))
1948 hdr[1] |= (1 << 7);
1949
1950 memcpy(rbuf, hdr, sizeof(hdr));
1951 memcpy(&rbuf[8], "ATA ", 8);
1952 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1953 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1954
1955 if (rbuf[32] == 0 || rbuf[32] == ' ')
1956 memcpy(&rbuf[32], "n/a ", 4);
1957
1958 memcpy(rbuf + 59, versions, sizeof(versions));
1959
1960 return 0;
1961 }
1962
1963 /**
1964 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1965 * @args: device IDENTIFY data / SCSI command of interest.
1966 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1967 *
1968 * Returns list of inquiry VPD pages available.
1969 *
1970 * LOCKING:
1971 * spin_lock_irqsave(host lock)
1972 */
1973 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
1974 {
1975 const u8 pages[] = {
1976 0x00, /* page 0x00, this page */
1977 0x80, /* page 0x80, unit serial no page */
1978 0x83, /* page 0x83, device ident page */
1979 0x89, /* page 0x89, ata info page */
1980 0xb0, /* page 0xb0, block limits page */
1981 0xb1, /* page 0xb1, block device characteristics page */
1982 0xb2, /* page 0xb2, thin provisioning page */
1983 };
1984
1985 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
1986 memcpy(rbuf + 4, pages, sizeof(pages));
1987 return 0;
1988 }
1989
1990 /**
1991 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1992 * @args: device IDENTIFY data / SCSI command of interest.
1993 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1994 *
1995 * Returns ATA device serial number.
1996 *
1997 * LOCKING:
1998 * spin_lock_irqsave(host lock)
1999 */
2000 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
2001 {
2002 const u8 hdr[] = {
2003 0,
2004 0x80, /* this page code */
2005 0,
2006 ATA_ID_SERNO_LEN, /* page len */
2007 };
2008
2009 memcpy(rbuf, hdr, sizeof(hdr));
2010 ata_id_string(args->id, (unsigned char *) &rbuf[4],
2011 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2012 return 0;
2013 }
2014
2015 /**
2016 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2017 * @args: device IDENTIFY data / SCSI command of interest.
2018 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2019 *
2020 * Yields two logical unit device identification designators:
2021 * - vendor specific ASCII containing the ATA serial number
2022 * - SAT defined "t10 vendor id based" containing ASCII vendor
2023 * name ("ATA "), model and serial numbers.
2024 *
2025 * LOCKING:
2026 * spin_lock_irqsave(host lock)
2027 */
2028 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
2029 {
2030 const int sat_model_serial_desc_len = 68;
2031 int num;
2032
2033 rbuf[1] = 0x83; /* this page code */
2034 num = 4;
2035
2036 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2037 rbuf[num + 0] = 2;
2038 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2039 num += 4;
2040 ata_id_string(args->id, (unsigned char *) rbuf + num,
2041 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2042 num += ATA_ID_SERNO_LEN;
2043
2044 /* SAT defined lu model and serial numbers descriptor */
2045 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2046 rbuf[num + 0] = 2;
2047 rbuf[num + 1] = 1;
2048 rbuf[num + 3] = sat_model_serial_desc_len;
2049 num += 4;
2050 memcpy(rbuf + num, "ATA ", 8);
2051 num += 8;
2052 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2053 ATA_ID_PROD_LEN);
2054 num += ATA_ID_PROD_LEN;
2055 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2056 ATA_ID_SERNO_LEN);
2057 num += ATA_ID_SERNO_LEN;
2058
2059 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
2060 return 0;
2061 }
2062
2063 /**
2064 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2065 * @args: device IDENTIFY data / SCSI command of interest.
2066 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2067 *
2068 * Yields SAT-specified ATA VPD page.
2069 *
2070 * LOCKING:
2071 * spin_lock_irqsave(host lock)
2072 */
2073 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
2074 {
2075 struct ata_taskfile tf;
2076
2077 memset(&tf, 0, sizeof(tf));
2078
2079 rbuf[1] = 0x89; /* our page code */
2080 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2081 rbuf[3] = (0x238 & 0xff);
2082
2083 memcpy(&rbuf[8], "linux ", 8);
2084 memcpy(&rbuf[16], "libata ", 16);
2085 memcpy(&rbuf[32], DRV_VERSION, 4);
2086 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
2087
2088 /* we don't store the ATA device signature, so we fake it */
2089
2090 tf.command = ATA_DRDY; /* really, this is Status reg */
2091 tf.lbal = 0x1;
2092 tf.nsect = 0x1;
2093
2094 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2095 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
2096
2097 rbuf[56] = ATA_CMD_ID_ATA;
2098
2099 memcpy(&rbuf[60], &args->id[0], 512);
2100 return 0;
2101 }
2102
2103 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
2104 {
2105 u16 min_io_sectors;
2106
2107 rbuf[1] = 0xb0;
2108 rbuf[3] = 0x3c; /* required VPD size with unmap support */
2109
2110 /*
2111 * Optimal transfer length granularity.
2112 *
2113 * This is always one physical block, but for disks with a smaller
2114 * logical than physical sector size we need to figure out what the
2115 * latter is.
2116 */
2117 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
2118 put_unaligned_be16(min_io_sectors, &rbuf[6]);
2119
2120 /*
2121 * Optimal unmap granularity.
2122 *
2123 * The ATA spec doesn't even know about a granularity or alignment
2124 * for the TRIM command. We can leave away most of the unmap related
2125 * VPD page entries, but we have specifify a granularity to signal
2126 * that we support some form of unmap - in thise case via WRITE SAME
2127 * with the unmap bit set.
2128 */
2129 if (ata_id_has_trim(args->id)) {
2130 put_unaligned_be32(65535 * 512 / 8, &rbuf[20]);
2131 put_unaligned_be32(1, &rbuf[28]);
2132 }
2133
2134 return 0;
2135 }
2136
2137 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2138 {
2139 int form_factor = ata_id_form_factor(args->id);
2140 int media_rotation_rate = ata_id_rotation_rate(args->id);
2141
2142 rbuf[1] = 0xb1;
2143 rbuf[3] = 0x3c;
2144 rbuf[4] = media_rotation_rate >> 8;
2145 rbuf[5] = media_rotation_rate;
2146 rbuf[7] = form_factor;
2147
2148 return 0;
2149 }
2150
2151 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
2152 {
2153 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2154 rbuf[1] = 0xb2;
2155 rbuf[3] = 0x4;
2156 rbuf[5] = 1 << 6; /* TPWS */
2157
2158 return 0;
2159 }
2160
2161 /**
2162 * ata_scsiop_noop - Command handler that simply returns success.
2163 * @args: device IDENTIFY data / SCSI command of interest.
2164 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2165 *
2166 * No operation. Simply returns success to caller, to indicate
2167 * that the caller should successfully complete this SCSI command.
2168 *
2169 * LOCKING:
2170 * spin_lock_irqsave(host lock)
2171 */
2172 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
2173 {
2174 VPRINTK("ENTER\n");
2175 return 0;
2176 }
2177
2178 /**
2179 * ata_msense_caching - Simulate MODE SENSE caching info page
2180 * @id: device IDENTIFY data
2181 * @buf: output buffer
2182 *
2183 * Generate a caching info page, which conditionally indicates
2184 * write caching to the SCSI layer, depending on device
2185 * capabilities.
2186 *
2187 * LOCKING:
2188 * None.
2189 */
2190 static unsigned int ata_msense_caching(u16 *id, u8 *buf)
2191 {
2192 memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage));
2193 if (ata_id_wcache_enabled(id))
2194 buf[2] |= (1 << 2); /* write cache enable */
2195 if (!ata_id_rahead_enabled(id))
2196 buf[12] |= (1 << 5); /* disable read ahead */
2197 return sizeof(def_cache_mpage);
2198 }
2199
2200 /**
2201 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2202 * @buf: output buffer
2203 *
2204 * Generate a generic MODE SENSE control mode page.
2205 *
2206 * LOCKING:
2207 * None.
2208 */
2209 static unsigned int ata_msense_ctl_mode(u8 *buf)
2210 {
2211 memcpy(buf, def_control_mpage, sizeof(def_control_mpage));
2212 return sizeof(def_control_mpage);
2213 }
2214
2215 /**
2216 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2217 * @buf: output buffer
2218 *
2219 * Generate a generic MODE SENSE r/w error recovery page.
2220 *
2221 * LOCKING:
2222 * None.
2223 */
2224 static unsigned int ata_msense_rw_recovery(u8 *buf)
2225 {
2226 memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage));
2227 return sizeof(def_rw_recovery_mpage);
2228 }
2229
2230 /*
2231 * We can turn this into a real blacklist if it's needed, for now just
2232 * blacklist any Maxtor BANC1G10 revision firmware
2233 */
2234 static int ata_dev_supports_fua(u16 *id)
2235 {
2236 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2237
2238 if (!libata_fua)
2239 return 0;
2240 if (!ata_id_has_fua(id))
2241 return 0;
2242
2243 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2244 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2245
2246 if (strcmp(model, "Maxtor"))
2247 return 1;
2248 if (strcmp(fw, "BANC1G10"))
2249 return 1;
2250
2251 return 0; /* blacklisted */
2252 }
2253
2254 /**
2255 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2256 * @args: device IDENTIFY data / SCSI command of interest.
2257 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2258 *
2259 * Simulate MODE SENSE commands. Assume this is invoked for direct
2260 * access devices (e.g. disks) only. There should be no block
2261 * descriptor for other device types.
2262 *
2263 * LOCKING:
2264 * spin_lock_irqsave(host lock)
2265 */
2266 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
2267 {
2268 struct ata_device *dev = args->dev;
2269 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
2270 const u8 sat_blk_desc[] = {
2271 0, 0, 0, 0, /* number of blocks: sat unspecified */
2272 0,
2273 0, 0x2, 0x0 /* block length: 512 bytes */
2274 };
2275 u8 pg, spg;
2276 unsigned int ebd, page_control, six_byte;
2277 u8 dpofua;
2278
2279 VPRINTK("ENTER\n");
2280
2281 six_byte = (scsicmd[0] == MODE_SENSE);
2282 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2283 /*
2284 * LLBA bit in msense(10) ignored (compliant)
2285 */
2286
2287 page_control = scsicmd[2] >> 6;
2288 switch (page_control) {
2289 case 0: /* current */
2290 break; /* supported */
2291 case 3: /* saved */
2292 goto saving_not_supp;
2293 case 1: /* changeable */
2294 case 2: /* defaults */
2295 default:
2296 goto invalid_fld;
2297 }
2298
2299 if (six_byte)
2300 p += 4 + (ebd ? 8 : 0);
2301 else
2302 p += 8 + (ebd ? 8 : 0);
2303
2304 pg = scsicmd[2] & 0x3f;
2305 spg = scsicmd[3];
2306 /*
2307 * No mode subpages supported (yet) but asking for _all_
2308 * subpages may be valid
2309 */
2310 if (spg && (spg != ALL_SUB_MPAGES))
2311 goto invalid_fld;
2312
2313 switch(pg) {
2314 case RW_RECOVERY_MPAGE:
2315 p += ata_msense_rw_recovery(p);
2316 break;
2317
2318 case CACHE_MPAGE:
2319 p += ata_msense_caching(args->id, p);
2320 break;
2321
2322 case CONTROL_MPAGE:
2323 p += ata_msense_ctl_mode(p);
2324 break;
2325
2326 case ALL_MPAGES:
2327 p += ata_msense_rw_recovery(p);
2328 p += ata_msense_caching(args->id, p);
2329 p += ata_msense_ctl_mode(p);
2330 break;
2331
2332 default: /* invalid page code */
2333 goto invalid_fld;
2334 }
2335
2336 dpofua = 0;
2337 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2338 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2339 dpofua = 1 << 4;
2340
2341 if (six_byte) {
2342 rbuf[0] = p - rbuf - 1;
2343 rbuf[2] |= dpofua;
2344 if (ebd) {
2345 rbuf[3] = sizeof(sat_blk_desc);
2346 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2347 }
2348 } else {
2349 unsigned int output_len = p - rbuf - 2;
2350
2351 rbuf[0] = output_len >> 8;
2352 rbuf[1] = output_len;
2353 rbuf[3] |= dpofua;
2354 if (ebd) {
2355 rbuf[7] = sizeof(sat_blk_desc);
2356 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2357 }
2358 }
2359 return 0;
2360
2361 invalid_fld:
2362 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2363 /* "Invalid field in cbd" */
2364 return 1;
2365
2366 saving_not_supp:
2367 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2368 /* "Saving parameters not supported" */
2369 return 1;
2370 }
2371
2372 /**
2373 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2374 * @args: device IDENTIFY data / SCSI command of interest.
2375 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2376 *
2377 * Simulate READ CAPACITY commands.
2378 *
2379 * LOCKING:
2380 * None.
2381 */
2382 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
2383 {
2384 struct ata_device *dev = args->dev;
2385 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
2386 u32 sector_size; /* physical sector size in bytes */
2387 u8 log2_per_phys;
2388 u16 lowest_aligned;
2389
2390 sector_size = ata_id_logical_sector_size(dev->id);
2391 log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2392 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
2393
2394 VPRINTK("ENTER\n");
2395
2396 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2397 if (last_lba >= 0xffffffffULL)
2398 last_lba = 0xffffffff;
2399
2400 /* sector count, 32-bit */
2401 rbuf[0] = last_lba >> (8 * 3);
2402 rbuf[1] = last_lba >> (8 * 2);
2403 rbuf[2] = last_lba >> (8 * 1);
2404 rbuf[3] = last_lba;
2405
2406 /* sector size */
2407 rbuf[4] = sector_size >> (8 * 3);
2408 rbuf[5] = sector_size >> (8 * 2);
2409 rbuf[6] = sector_size >> (8 * 1);
2410 rbuf[7] = sector_size;
2411 } else {
2412 /* sector count, 64-bit */
2413 rbuf[0] = last_lba >> (8 * 7);
2414 rbuf[1] = last_lba >> (8 * 6);
2415 rbuf[2] = last_lba >> (8 * 5);
2416 rbuf[3] = last_lba >> (8 * 4);
2417 rbuf[4] = last_lba >> (8 * 3);
2418 rbuf[5] = last_lba >> (8 * 2);
2419 rbuf[6] = last_lba >> (8 * 1);
2420 rbuf[7] = last_lba;
2421
2422 /* sector size */
2423 rbuf[ 8] = sector_size >> (8 * 3);
2424 rbuf[ 9] = sector_size >> (8 * 2);
2425 rbuf[10] = sector_size >> (8 * 1);
2426 rbuf[11] = sector_size;
2427
2428 rbuf[12] = 0;
2429 rbuf[13] = log2_per_phys;
2430 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2431 rbuf[15] = lowest_aligned;
2432
2433 if (ata_id_has_trim(args->id)) {
2434 rbuf[14] |= 0x80; /* TPE */
2435
2436 if (ata_id_has_zero_after_trim(args->id))
2437 rbuf[14] |= 0x40; /* TPRZ */
2438 }
2439 }
2440
2441 return 0;
2442 }
2443
2444 /**
2445 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2446 * @args: device IDENTIFY data / SCSI command of interest.
2447 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2448 *
2449 * Simulate REPORT LUNS command.
2450 *
2451 * LOCKING:
2452 * spin_lock_irqsave(host lock)
2453 */
2454 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
2455 {
2456 VPRINTK("ENTER\n");
2457 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2458
2459 return 0;
2460 }
2461
2462 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2463 {
2464 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2465 /* FIXME: not quite right; we don't want the
2466 * translation of taskfile registers into
2467 * a sense descriptors, since that's only
2468 * correct for ATA, not ATAPI
2469 */
2470 ata_gen_passthru_sense(qc);
2471 }
2472
2473 qc->scsidone(qc->scsicmd);
2474 ata_qc_free(qc);
2475 }
2476
2477 /* is it pointless to prefer PIO for "safety reasons"? */
2478 static inline int ata_pio_use_silly(struct ata_port *ap)
2479 {
2480 return (ap->flags & ATA_FLAG_PIO_DMA);
2481 }
2482
2483 static void atapi_request_sense(struct ata_queued_cmd *qc)
2484 {
2485 struct ata_port *ap = qc->ap;
2486 struct scsi_cmnd *cmd = qc->scsicmd;
2487
2488 DPRINTK("ATAPI request sense\n");
2489
2490 /* FIXME: is this needed? */
2491 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2492
2493 #ifdef CONFIG_ATA_SFF
2494 if (ap->ops->sff_tf_read)
2495 ap->ops->sff_tf_read(ap, &qc->tf);
2496 #endif
2497
2498 /* fill these in, for the case where they are -not- overwritten */
2499 cmd->sense_buffer[0] = 0x70;
2500 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2501
2502 ata_qc_reinit(qc);
2503
2504 /* setup sg table and init transfer direction */
2505 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2506 ata_sg_init(qc, &qc->sgent, 1);
2507 qc->dma_dir = DMA_FROM_DEVICE;
2508
2509 memset(&qc->cdb, 0, qc->dev->cdb_len);
2510 qc->cdb[0] = REQUEST_SENSE;
2511 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2512
2513 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2514 qc->tf.command = ATA_CMD_PACKET;
2515
2516 if (ata_pio_use_silly(ap)) {
2517 qc->tf.protocol = ATAPI_PROT_DMA;
2518 qc->tf.feature |= ATAPI_PKT_DMA;
2519 } else {
2520 qc->tf.protocol = ATAPI_PROT_PIO;
2521 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2522 qc->tf.lbah = 0;
2523 }
2524 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2525
2526 qc->complete_fn = atapi_sense_complete;
2527
2528 ata_qc_issue(qc);
2529
2530 DPRINTK("EXIT\n");
2531 }
2532
2533 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2534 {
2535 struct scsi_cmnd *cmd = qc->scsicmd;
2536 unsigned int err_mask = qc->err_mask;
2537
2538 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2539
2540 /* handle completion from new EH */
2541 if (unlikely(qc->ap->ops->error_handler &&
2542 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2543
2544 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2545 /* FIXME: not quite right; we don't want the
2546 * translation of taskfile registers into a
2547 * sense descriptors, since that's only
2548 * correct for ATA, not ATAPI
2549 */
2550 ata_gen_passthru_sense(qc);
2551 }
2552
2553 /* SCSI EH automatically locks door if sdev->locked is
2554 * set. Sometimes door lock request continues to
2555 * fail, for example, when no media is present. This
2556 * creates a loop - SCSI EH issues door lock which
2557 * fails and gets invoked again to acquire sense data
2558 * for the failed command.
2559 *
2560 * If door lock fails, always clear sdev->locked to
2561 * avoid this infinite loop.
2562 *
2563 * This may happen before SCSI scan is complete. Make
2564 * sure qc->dev->sdev isn't NULL before dereferencing.
2565 */
2566 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
2567 qc->dev->sdev->locked = 0;
2568
2569 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2570 qc->scsidone(cmd);
2571 ata_qc_free(qc);
2572 return;
2573 }
2574
2575 /* successful completion or old EH failure path */
2576 if (unlikely(err_mask & AC_ERR_DEV)) {
2577 cmd->result = SAM_STAT_CHECK_CONDITION;
2578 atapi_request_sense(qc);
2579 return;
2580 } else if (unlikely(err_mask)) {
2581 /* FIXME: not quite right; we don't want the
2582 * translation of taskfile registers into
2583 * a sense descriptors, since that's only
2584 * correct for ATA, not ATAPI
2585 */
2586 ata_gen_passthru_sense(qc);
2587 } else {
2588 u8 *scsicmd = cmd->cmnd;
2589
2590 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2591 unsigned long flags;
2592 u8 *buf;
2593
2594 buf = ata_scsi_rbuf_get(cmd, true, &flags);
2595
2596 /* ATAPI devices typically report zero for their SCSI version,
2597 * and sometimes deviate from the spec WRT response data
2598 * format. If SCSI version is reported as zero like normal,
2599 * then we make the following fixups: 1) Fake MMC-5 version,
2600 * to indicate to the Linux scsi midlayer this is a modern
2601 * device. 2) Ensure response data format / ATAPI information
2602 * are always correct.
2603 */
2604 if (buf[2] == 0) {
2605 buf[2] = 0x5;
2606 buf[3] = 0x32;
2607 }
2608
2609 ata_scsi_rbuf_put(cmd, true, &flags);
2610 }
2611
2612 cmd->result = SAM_STAT_GOOD;
2613 }
2614
2615 qc->scsidone(cmd);
2616 ata_qc_free(qc);
2617 }
2618 /**
2619 * atapi_xlat - Initialize PACKET taskfile
2620 * @qc: command structure to be initialized
2621 *
2622 * LOCKING:
2623 * spin_lock_irqsave(host lock)
2624 *
2625 * RETURNS:
2626 * Zero on success, non-zero on failure.
2627 */
2628 static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2629 {
2630 struct scsi_cmnd *scmd = qc->scsicmd;
2631 struct ata_device *dev = qc->dev;
2632 int nodata = (scmd->sc_data_direction == DMA_NONE);
2633 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2634 unsigned int nbytes;
2635
2636 memset(qc->cdb, 0, dev->cdb_len);
2637 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2638
2639 qc->complete_fn = atapi_qc_complete;
2640
2641 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2642 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2643 qc->tf.flags |= ATA_TFLAG_WRITE;
2644 DPRINTK("direction: write\n");
2645 }
2646
2647 qc->tf.command = ATA_CMD_PACKET;
2648 ata_qc_set_pc_nbytes(qc);
2649
2650 /* check whether ATAPI DMA is safe */
2651 if (!nodata && !using_pio && atapi_check_dma(qc))
2652 using_pio = 1;
2653
2654 /* Some controller variants snoop this value for Packet
2655 * transfers to do state machine and FIFO management. Thus we
2656 * want to set it properly, and for DMA where it is
2657 * effectively meaningless.
2658 */
2659 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2660
2661 /* Most ATAPI devices which honor transfer chunk size don't
2662 * behave according to the spec when odd chunk size which
2663 * matches the transfer length is specified. If the number of
2664 * bytes to transfer is 2n+1. According to the spec, what
2665 * should happen is to indicate that 2n+1 is going to be
2666 * transferred and transfer 2n+2 bytes where the last byte is
2667 * padding.
2668 *
2669 * In practice, this doesn't happen. ATAPI devices first
2670 * indicate and transfer 2n bytes and then indicate and
2671 * transfer 2 bytes where the last byte is padding.
2672 *
2673 * This inconsistency confuses several controllers which
2674 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2675 * These controllers use actual number of transferred bytes to
2676 * update DMA poitner and transfer of 4n+2 bytes make those
2677 * controller push DMA pointer by 4n+4 bytes because SATA data
2678 * FISes are aligned to 4 bytes. This causes data corruption
2679 * and buffer overrun.
2680 *
2681 * Always setting nbytes to even number solves this problem
2682 * because then ATAPI devices don't have to split data at 2n
2683 * boundaries.
2684 */
2685 if (nbytes & 0x1)
2686 nbytes++;
2687
2688 qc->tf.lbam = (nbytes & 0xFF);
2689 qc->tf.lbah = (nbytes >> 8);
2690
2691 if (nodata)
2692 qc->tf.protocol = ATAPI_PROT_NODATA;
2693 else if (using_pio)
2694 qc->tf.protocol = ATAPI_PROT_PIO;
2695 else {
2696 /* DMA data xfer */
2697 qc->tf.protocol = ATAPI_PROT_DMA;
2698 qc->tf.feature |= ATAPI_PKT_DMA;
2699
2700 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2701 (scmd->sc_data_direction != DMA_TO_DEVICE))
2702 /* some SATA bridges need us to indicate data xfer direction */
2703 qc->tf.feature |= ATAPI_DMADIR;
2704 }
2705
2706
2707 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2708 as ATAPI tape drives don't get this right otherwise */
2709 return 0;
2710 }
2711
2712 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2713 {
2714 if (!sata_pmp_attached(ap)) {
2715 if (likely(devno < ata_link_max_devices(&ap->link)))
2716 return &ap->link.device[devno];
2717 } else {
2718 if (likely(devno < ap->nr_pmp_links))
2719 return &ap->pmp_link[devno].device[0];
2720 }
2721
2722 return NULL;
2723 }
2724
2725 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2726 const struct scsi_device *scsidev)
2727 {
2728 int devno;
2729
2730 /* skip commands not addressed to targets we simulate */
2731 if (!sata_pmp_attached(ap)) {
2732 if (unlikely(scsidev->channel || scsidev->lun))
2733 return NULL;
2734 devno = scsidev->id;
2735 } else {
2736 if (unlikely(scsidev->id || scsidev->lun))
2737 return NULL;
2738 devno = scsidev->channel;
2739 }
2740
2741 return ata_find_dev(ap, devno);
2742 }
2743
2744 /**
2745 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2746 * @ap: ATA port to which the device is attached
2747 * @scsidev: SCSI device from which we derive the ATA device
2748 *
2749 * Given various information provided in struct scsi_cmnd,
2750 * map that onto an ATA bus, and using that mapping
2751 * determine which ata_device is associated with the
2752 * SCSI command to be sent.
2753 *
2754 * LOCKING:
2755 * spin_lock_irqsave(host lock)
2756 *
2757 * RETURNS:
2758 * Associated ATA device, or %NULL if not found.
2759 */
2760 static struct ata_device *
2761 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2762 {
2763 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2764
2765 if (unlikely(!dev || !ata_dev_enabled(dev)))
2766 return NULL;
2767
2768 return dev;
2769 }
2770
2771 /*
2772 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2773 * @byte1: Byte 1 from pass-thru CDB.
2774 *
2775 * RETURNS:
2776 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2777 */
2778 static u8
2779 ata_scsi_map_proto(u8 byte1)
2780 {
2781 switch((byte1 & 0x1e) >> 1) {
2782 case 3: /* Non-data */
2783 return ATA_PROT_NODATA;
2784
2785 case 6: /* DMA */
2786 case 10: /* UDMA Data-in */
2787 case 11: /* UDMA Data-Out */
2788 return ATA_PROT_DMA;
2789
2790 case 4: /* PIO Data-in */
2791 case 5: /* PIO Data-out */
2792 return ATA_PROT_PIO;
2793
2794 case 0: /* Hard Reset */
2795 case 1: /* SRST */
2796 case 8: /* Device Diagnostic */
2797 case 9: /* Device Reset */
2798 case 7: /* DMA Queued */
2799 case 12: /* FPDMA */
2800 case 15: /* Return Response Info */
2801 default: /* Reserved */
2802 break;
2803 }
2804
2805 return ATA_PROT_UNKNOWN;
2806 }
2807
2808 /**
2809 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2810 * @qc: command structure to be initialized
2811 *
2812 * Handles either 12 or 16-byte versions of the CDB.
2813 *
2814 * RETURNS:
2815 * Zero on success, non-zero on failure.
2816 */
2817 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2818 {
2819 struct ata_taskfile *tf = &(qc->tf);
2820 struct scsi_cmnd *scmd = qc->scsicmd;
2821 struct ata_device *dev = qc->dev;
2822 const u8 *cdb = scmd->cmnd;
2823
2824 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2825 goto invalid_fld;
2826
2827 /*
2828 * 12 and 16 byte CDBs use different offsets to
2829 * provide the various register values.
2830 */
2831 if (cdb[0] == ATA_16) {
2832 /*
2833 * 16-byte CDB - may contain extended commands.
2834 *
2835 * If that is the case, copy the upper byte register values.
2836 */
2837 if (cdb[1] & 0x01) {
2838 tf->hob_feature = cdb[3];
2839 tf->hob_nsect = cdb[5];
2840 tf->hob_lbal = cdb[7];
2841 tf->hob_lbam = cdb[9];
2842 tf->hob_lbah = cdb[11];
2843 tf->flags |= ATA_TFLAG_LBA48;
2844 } else
2845 tf->flags &= ~ATA_TFLAG_LBA48;
2846
2847 /*
2848 * Always copy low byte, device and command registers.
2849 */
2850 tf->feature = cdb[4];
2851 tf->nsect = cdb[6];
2852 tf->lbal = cdb[8];
2853 tf->lbam = cdb[10];
2854 tf->lbah = cdb[12];
2855 tf->device = cdb[13];
2856 tf->command = cdb[14];
2857 } else {
2858 /*
2859 * 12-byte CDB - incapable of extended commands.
2860 */
2861 tf->flags &= ~ATA_TFLAG_LBA48;
2862
2863 tf->feature = cdb[3];
2864 tf->nsect = cdb[4];
2865 tf->lbal = cdb[5];
2866 tf->lbam = cdb[6];
2867 tf->lbah = cdb[7];
2868 tf->device = cdb[8];
2869 tf->command = cdb[9];
2870 }
2871
2872 /* enforce correct master/slave bit */
2873 tf->device = dev->devno ?
2874 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2875
2876 switch (tf->command) {
2877 /* READ/WRITE LONG use a non-standard sect_size */
2878 case ATA_CMD_READ_LONG:
2879 case ATA_CMD_READ_LONG_ONCE:
2880 case ATA_CMD_WRITE_LONG:
2881 case ATA_CMD_WRITE_LONG_ONCE:
2882 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2883 goto invalid_fld;
2884 qc->sect_size = scsi_bufflen(scmd);
2885 break;
2886
2887 /* commands using reported Logical Block size (e.g. 512 or 4K) */
2888 case ATA_CMD_CFA_WRITE_NE:
2889 case ATA_CMD_CFA_TRANS_SECT:
2890 case ATA_CMD_CFA_WRITE_MULT_NE:
2891 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
2892 case ATA_CMD_READ:
2893 case ATA_CMD_READ_EXT:
2894 case ATA_CMD_READ_QUEUED:
2895 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
2896 case ATA_CMD_FPDMA_READ:
2897 case ATA_CMD_READ_MULTI:
2898 case ATA_CMD_READ_MULTI_EXT:
2899 case ATA_CMD_PIO_READ:
2900 case ATA_CMD_PIO_READ_EXT:
2901 case ATA_CMD_READ_STREAM_DMA_EXT:
2902 case ATA_CMD_READ_STREAM_EXT:
2903 case ATA_CMD_VERIFY:
2904 case ATA_CMD_VERIFY_EXT:
2905 case ATA_CMD_WRITE:
2906 case ATA_CMD_WRITE_EXT:
2907 case ATA_CMD_WRITE_FUA_EXT:
2908 case ATA_CMD_WRITE_QUEUED:
2909 case ATA_CMD_WRITE_QUEUED_FUA_EXT:
2910 case ATA_CMD_FPDMA_WRITE:
2911 case ATA_CMD_WRITE_MULTI:
2912 case ATA_CMD_WRITE_MULTI_EXT:
2913 case ATA_CMD_WRITE_MULTI_FUA_EXT:
2914 case ATA_CMD_PIO_WRITE:
2915 case ATA_CMD_PIO_WRITE_EXT:
2916 case ATA_CMD_WRITE_STREAM_DMA_EXT:
2917 case ATA_CMD_WRITE_STREAM_EXT:
2918 qc->sect_size = scmd->device->sector_size;
2919 break;
2920
2921 /* Everything else uses 512 byte "sectors" */
2922 default:
2923 qc->sect_size = ATA_SECT_SIZE;
2924 }
2925
2926 /*
2927 * Set flags so that all registers will be written, pass on
2928 * write indication (used for PIO/DMA setup), result TF is
2929 * copied back and we don't whine too much about its failure.
2930 */
2931 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2932 if (scmd->sc_data_direction == DMA_TO_DEVICE)
2933 tf->flags |= ATA_TFLAG_WRITE;
2934
2935 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
2936
2937 /*
2938 * Set transfer length.
2939 *
2940 * TODO: find out if we need to do more here to
2941 * cover scatter/gather case.
2942 */
2943 ata_qc_set_pc_nbytes(qc);
2944
2945 /* We may not issue DMA commands if no DMA mode is set */
2946 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2947 goto invalid_fld;
2948
2949 /* sanity check for pio multi commands */
2950 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
2951 goto invalid_fld;
2952
2953 if (is_multi_taskfile(tf)) {
2954 unsigned int multi_count = 1 << (cdb[1] >> 5);
2955
2956 /* compare the passed through multi_count
2957 * with the cached multi_count of libata
2958 */
2959 if (multi_count != dev->multi_count)
2960 ata_dev_printk(dev, KERN_WARNING,
2961 "invalid multi_count %u ignored\n",
2962 multi_count);
2963 }
2964
2965 /*
2966 * Filter SET_FEATURES - XFER MODE command -- otherwise,
2967 * SET_FEATURES - XFER MODE must be preceded/succeeded
2968 * by an update to hardware-specific registers for each
2969 * controller (i.e. the reason for ->set_piomode(),
2970 * ->set_dmamode(), and ->post_set_mode() hooks).
2971 */
2972 if (tf->command == ATA_CMD_SET_FEATURES &&
2973 tf->feature == SETFEATURES_XFER)
2974 goto invalid_fld;
2975
2976 /*
2977 * Filter TPM commands by default. These provide an
2978 * essentially uncontrolled encrypted "back door" between
2979 * applications and the disk. Set libata.allow_tpm=1 if you
2980 * have a real reason for wanting to use them. This ensures
2981 * that installed software cannot easily mess stuff up without
2982 * user intent. DVR type users will probably ship with this enabled
2983 * for movie content management.
2984 *
2985 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
2986 * for this and should do in future but that it is not sufficient as
2987 * DCS is an optional feature set. Thus we also do the software filter
2988 * so that we comply with the TC consortium stated goal that the user
2989 * can turn off TC features of their system.
2990 */
2991 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
2992 goto invalid_fld;
2993
2994 return 0;
2995
2996 invalid_fld:
2997 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
2998 /* "Invalid field in cdb" */
2999 return 1;
3000 }
3001
3002 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3003 {
3004 struct ata_taskfile *tf = &qc->tf;
3005 struct scsi_cmnd *scmd = qc->scsicmd;
3006 struct ata_device *dev = qc->dev;
3007 const u8 *cdb = scmd->cmnd;
3008 u64 block;
3009 u32 n_block;
3010 u32 size;
3011 void *buf;
3012
3013 /* we may not issue DMA commands if no DMA mode is set */
3014 if (unlikely(!dev->dma_mode))
3015 goto invalid_fld;
3016
3017 if (unlikely(scmd->cmd_len < 16))
3018 goto invalid_fld;
3019 scsi_16_lba_len(cdb, &block, &n_block);
3020
3021 /* for now we only support WRITE SAME with the unmap bit set */
3022 if (unlikely(!(cdb[1] & 0x8)))
3023 goto invalid_fld;
3024
3025 /*
3026 * WRITE SAME always has a sector sized buffer as payload, this
3027 * should never be a multiple entry S/G list.
3028 */
3029 if (!scsi_sg_count(scmd))
3030 goto invalid_fld;
3031
3032 buf = page_address(sg_page(scsi_sglist(scmd)));
3033 size = ata_set_lba_range_entries(buf, 512, block, n_block);
3034
3035 tf->protocol = ATA_PROT_DMA;
3036 tf->hob_feature = 0;
3037 tf->feature = ATA_DSM_TRIM;
3038 tf->hob_nsect = (size / 512) >> 8;
3039 tf->nsect = size / 512;
3040 tf->command = ATA_CMD_DSM;
3041 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3042 ATA_TFLAG_WRITE;
3043
3044 ata_qc_set_pc_nbytes(qc);
3045
3046 return 0;
3047
3048 invalid_fld:
3049 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3050 /* "Invalid field in cdb" */
3051 return 1;
3052 }
3053
3054 /**
3055 * ata_get_xlat_func - check if SCSI to ATA translation is possible
3056 * @dev: ATA device
3057 * @cmd: SCSI command opcode to consider
3058 *
3059 * Look up the SCSI command given, and determine whether the
3060 * SCSI command is to be translated or simulated.
3061 *
3062 * RETURNS:
3063 * Pointer to translation function if possible, %NULL if not.
3064 */
3065
3066 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
3067 {
3068 switch (cmd) {
3069 case READ_6:
3070 case READ_10:
3071 case READ_16:
3072
3073 case WRITE_6:
3074 case WRITE_10:
3075 case WRITE_16:
3076 return ata_scsi_rw_xlat;
3077
3078 case WRITE_SAME_16:
3079 return ata_scsi_write_same_xlat;
3080
3081 case SYNCHRONIZE_CACHE:
3082 if (ata_try_flush_cache(dev))
3083 return ata_scsi_flush_xlat;
3084 break;
3085
3086 case VERIFY:
3087 case VERIFY_16:
3088 return ata_scsi_verify_xlat;
3089
3090 case ATA_12:
3091 case ATA_16:
3092 return ata_scsi_pass_thru;
3093
3094 case START_STOP:
3095 return ata_scsi_start_stop_xlat;
3096 }
3097
3098 return NULL;
3099 }
3100
3101 /**
3102 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3103 * @ap: ATA port to which the command was being sent
3104 * @cmd: SCSI command to dump
3105 *
3106 * Prints the contents of a SCSI command via printk().
3107 */
3108
3109 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
3110 struct scsi_cmnd *cmd)
3111 {
3112 #ifdef ATA_DEBUG
3113 struct scsi_device *scsidev = cmd->device;
3114 u8 *scsicmd = cmd->cmnd;
3115
3116 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
3117 ap->print_id,
3118 scsidev->channel, scsidev->id, scsidev->lun,
3119 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
3120 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
3121 scsicmd[8]);
3122 #endif
3123 }
3124
3125 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
3126 struct ata_device *dev)
3127 {
3128 u8 scsi_op = scmd->cmnd[0];
3129 ata_xlat_func_t xlat_func;
3130 int rc = 0;
3131
3132 if (dev->class == ATA_DEV_ATA) {
3133 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
3134 goto bad_cdb_len;
3135
3136 xlat_func = ata_get_xlat_func(dev, scsi_op);
3137 } else {
3138 if (unlikely(!scmd->cmd_len))
3139 goto bad_cdb_len;
3140
3141 xlat_func = NULL;
3142 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
3143 /* relay SCSI command to ATAPI device */
3144 int len = COMMAND_SIZE(scsi_op);
3145 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
3146 goto bad_cdb_len;
3147
3148 xlat_func = atapi_xlat;
3149 } else {
3150 /* ATA_16 passthru, treat as an ATA command */
3151 if (unlikely(scmd->cmd_len > 16))
3152 goto bad_cdb_len;
3153
3154 xlat_func = ata_get_xlat_func(dev, scsi_op);
3155 }
3156 }
3157
3158 if (xlat_func)
3159 rc = ata_scsi_translate(dev, scmd, xlat_func);
3160 else
3161 ata_scsi_simulate(dev, scmd);
3162
3163 return rc;
3164
3165 bad_cdb_len:
3166 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3167 scmd->cmd_len, scsi_op, dev->cdb_len);
3168 scmd->result = DID_ERROR << 16;
3169 scmd->scsi_done(scmd);
3170 return 0;
3171 }
3172
3173 /**
3174 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3175 * @shost: SCSI host of command to be sent
3176 * @cmd: SCSI command to be sent
3177 *
3178 * In some cases, this function translates SCSI commands into
3179 * ATA taskfiles, and queues the taskfiles to be sent to
3180 * hardware. In other cases, this function simulates a
3181 * SCSI device by evaluating and responding to certain
3182 * SCSI commands. This creates the overall effect of
3183 * ATA and ATAPI devices appearing as SCSI devices.
3184 *
3185 * LOCKING:
3186 * ATA host lock
3187 *
3188 * RETURNS:
3189 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3190 * 0 otherwise.
3191 */
3192 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
3193 {
3194 struct ata_port *ap;
3195 struct ata_device *dev;
3196 struct scsi_device *scsidev = cmd->device;
3197 int rc = 0;
3198 unsigned long irq_flags;
3199
3200 ap = ata_shost_to_port(shost);
3201
3202 spin_lock_irqsave(ap->lock, irq_flags);
3203
3204 ata_scsi_dump_cdb(ap, cmd);
3205
3206 dev = ata_scsi_find_dev(ap, scsidev);
3207 if (likely(dev))
3208 rc = __ata_scsi_queuecmd(cmd, dev);
3209 else {
3210 cmd->result = (DID_BAD_TARGET << 16);
3211 cmd->scsi_done(cmd);
3212 }
3213
3214 spin_unlock_irqrestore(ap->lock, irq_flags);
3215
3216 return rc;
3217 }
3218
3219 /**
3220 * ata_scsi_simulate - simulate SCSI command on ATA device
3221 * @dev: the target device
3222 * @cmd: SCSI command being sent to device.
3223 *
3224 * Interprets and directly executes a select list of SCSI commands
3225 * that can be handled internally.
3226 *
3227 * LOCKING:
3228 * spin_lock_irqsave(host lock)
3229 */
3230
3231 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
3232 {
3233 struct ata_scsi_args args;
3234 const u8 *scsicmd = cmd->cmnd;
3235 u8 tmp8;
3236
3237 args.dev = dev;
3238 args.id = dev->id;
3239 args.cmd = cmd;
3240 args.done = cmd->scsi_done;
3241
3242 switch(scsicmd[0]) {
3243 /* TODO: worth improving? */
3244 case FORMAT_UNIT:
3245 ata_scsi_invalid_field(cmd);
3246 break;
3247
3248 case INQUIRY:
3249 if (scsicmd[1] & 2) /* is CmdDt set? */
3250 ata_scsi_invalid_field(cmd);
3251 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3252 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3253 else switch (scsicmd[2]) {
3254 case 0x00:
3255 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3256 break;
3257 case 0x80:
3258 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3259 break;
3260 case 0x83:
3261 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3262 break;
3263 case 0x89:
3264 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3265 break;
3266 case 0xb0:
3267 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
3268 break;
3269 case 0xb1:
3270 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3271 break;
3272 case 0xb2:
3273 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
3274 break;
3275 default:
3276 ata_scsi_invalid_field(cmd);
3277 break;
3278 }
3279 break;
3280
3281 case MODE_SENSE:
3282 case MODE_SENSE_10:
3283 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3284 break;
3285
3286 case MODE_SELECT: /* unconditionally return */
3287 case MODE_SELECT_10: /* bad-field-in-cdb */
3288 ata_scsi_invalid_field(cmd);
3289 break;
3290
3291 case READ_CAPACITY:
3292 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3293 break;
3294
3295 case SERVICE_ACTION_IN:
3296 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3297 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3298 else
3299 ata_scsi_invalid_field(cmd);
3300 break;
3301
3302 case REPORT_LUNS:
3303 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3304 break;
3305
3306 case REQUEST_SENSE:
3307 ata_scsi_set_sense(cmd, 0, 0, 0);
3308 cmd->result = (DRIVER_SENSE << 24);
3309 cmd->scsi_done(cmd);
3310 break;
3311
3312 /* if we reach this, then writeback caching is disabled,
3313 * turning this into a no-op.
3314 */
3315 case SYNCHRONIZE_CACHE:
3316 /* fall through */
3317
3318 /* no-op's, complete with success */
3319 case REZERO_UNIT:
3320 case SEEK_6:
3321 case SEEK_10:
3322 case TEST_UNIT_READY:
3323 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3324 break;
3325
3326 case SEND_DIAGNOSTIC:
3327 tmp8 = scsicmd[1] & ~(1 << 3);
3328 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3329 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3330 else
3331 ata_scsi_invalid_field(cmd);
3332 break;
3333
3334 /* all other commands */
3335 default:
3336 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3337 /* "Invalid command operation code" */
3338 cmd->scsi_done(cmd);
3339 break;
3340 }
3341 }
3342
3343 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3344 {
3345 int i, rc;
3346
3347 for (i = 0; i < host->n_ports; i++) {
3348 struct ata_port *ap = host->ports[i];
3349 struct Scsi_Host *shost;
3350
3351 rc = -ENOMEM;
3352 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3353 if (!shost)
3354 goto err_alloc;
3355
3356 *(struct ata_port **)&shost->hostdata[0] = ap;
3357 ap->scsi_host = shost;
3358
3359 shost->transportt = ata_scsi_transport_template;
3360 shost->unique_id = ap->print_id;
3361 shost->max_id = 16;
3362 shost->max_lun = 1;
3363 shost->max_channel = 1;
3364 shost->max_cmd_len = 16;
3365
3366 /* Schedule policy is determined by ->qc_defer()
3367 * callback and it needs to see every deferred qc.
3368 * Set host_blocked to 1 to prevent SCSI midlayer from
3369 * automatically deferring requests.
3370 */
3371 shost->max_host_blocked = 1;
3372
3373 rc = scsi_add_host(ap->scsi_host, ap->host->dev);
3374 if (rc)
3375 goto err_add;
3376 }
3377
3378 return 0;
3379
3380 err_add:
3381 scsi_host_put(host->ports[i]->scsi_host);
3382 err_alloc:
3383 while (--i >= 0) {
3384 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3385
3386 scsi_remove_host(shost);
3387 scsi_host_put(shost);
3388 }
3389 return rc;
3390 }
3391
3392 void ata_scsi_scan_host(struct ata_port *ap, int sync)
3393 {
3394 int tries = 5;
3395 struct ata_device *last_failed_dev = NULL;
3396 struct ata_link *link;
3397 struct ata_device *dev;
3398
3399 repeat:
3400 ata_for_each_link(link, ap, EDGE) {
3401 ata_for_each_dev(dev, link, ENABLED) {
3402 struct scsi_device *sdev;
3403 int channel = 0, id = 0;
3404
3405 if (dev->sdev)
3406 continue;
3407
3408 if (ata_is_host_link(link))
3409 id = dev->devno;
3410 else
3411 channel = link->pmp;
3412
3413 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3414 NULL);
3415 if (!IS_ERR(sdev)) {
3416 dev->sdev = sdev;
3417 scsi_device_put(sdev);
3418 } else {
3419 dev->sdev = NULL;
3420 }
3421 }
3422 }
3423
3424 /* If we scanned while EH was in progress or allocation
3425 * failure occurred, scan would have failed silently. Check
3426 * whether all devices are attached.
3427 */
3428 ata_for_each_link(link, ap, EDGE) {
3429 ata_for_each_dev(dev, link, ENABLED) {
3430 if (!dev->sdev)
3431 goto exit_loop;
3432 }
3433 }
3434 exit_loop:
3435 if (!link)
3436 return;
3437
3438 /* we're missing some SCSI devices */
3439 if (sync) {
3440 /* If caller requested synchrnous scan && we've made
3441 * any progress, sleep briefly and repeat.
3442 */
3443 if (dev != last_failed_dev) {
3444 msleep(100);
3445 last_failed_dev = dev;
3446 goto repeat;
3447 }
3448
3449 /* We might be failing to detect boot device, give it
3450 * a few more chances.
3451 */
3452 if (--tries) {
3453 msleep(100);
3454 goto repeat;
3455 }
3456
3457 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan "
3458 "failed without making any progress,\n"
3459 " switching to async\n");
3460 }
3461
3462 queue_delayed_work(system_long_wq, &ap->hotplug_task,
3463 round_jiffies_relative(HZ));
3464 }
3465
3466 /**
3467 * ata_scsi_offline_dev - offline attached SCSI device
3468 * @dev: ATA device to offline attached SCSI device for
3469 *
3470 * This function is called from ata_eh_hotplug() and responsible
3471 * for taking the SCSI device attached to @dev offline. This
3472 * function is called with host lock which protects dev->sdev
3473 * against clearing.
3474 *
3475 * LOCKING:
3476 * spin_lock_irqsave(host lock)
3477 *
3478 * RETURNS:
3479 * 1 if attached SCSI device exists, 0 otherwise.
3480 */
3481 int ata_scsi_offline_dev(struct ata_device *dev)
3482 {
3483 if (dev->sdev) {
3484 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3485 return 1;
3486 }
3487 return 0;
3488 }
3489
3490 /**
3491 * ata_scsi_remove_dev - remove attached SCSI device
3492 * @dev: ATA device to remove attached SCSI device for
3493 *
3494 * This function is called from ata_eh_scsi_hotplug() and
3495 * responsible for removing the SCSI device attached to @dev.
3496 *
3497 * LOCKING:
3498 * Kernel thread context (may sleep).
3499 */
3500 static void ata_scsi_remove_dev(struct ata_device *dev)
3501 {
3502 struct ata_port *ap = dev->link->ap;
3503 struct scsi_device *sdev;
3504 unsigned long flags;
3505
3506 /* Alas, we need to grab scan_mutex to ensure SCSI device
3507 * state doesn't change underneath us and thus
3508 * scsi_device_get() always succeeds. The mutex locking can
3509 * be removed if there is __scsi_device_get() interface which
3510 * increments reference counts regardless of device state.
3511 */
3512 mutex_lock(&ap->scsi_host->scan_mutex);
3513 spin_lock_irqsave(ap->lock, flags);
3514
3515 /* clearing dev->sdev is protected by host lock */
3516 sdev = dev->sdev;
3517 dev->sdev = NULL;
3518
3519 if (sdev) {
3520 /* If user initiated unplug races with us, sdev can go
3521 * away underneath us after the host lock and
3522 * scan_mutex are released. Hold onto it.
3523 */
3524 if (scsi_device_get(sdev) == 0) {
3525 /* The following ensures the attached sdev is
3526 * offline on return from ata_scsi_offline_dev()
3527 * regardless it wins or loses the race
3528 * against this function.
3529 */
3530 scsi_device_set_state(sdev, SDEV_OFFLINE);
3531 } else {
3532 WARN_ON(1);
3533 sdev = NULL;
3534 }
3535 }
3536
3537 spin_unlock_irqrestore(ap->lock, flags);
3538 mutex_unlock(&ap->scsi_host->scan_mutex);
3539
3540 if (sdev) {
3541 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
3542 dev_name(&sdev->sdev_gendev));
3543
3544 scsi_remove_device(sdev);
3545 scsi_device_put(sdev);
3546 }
3547 }
3548
3549 static void ata_scsi_handle_link_detach(struct ata_link *link)
3550 {
3551 struct ata_port *ap = link->ap;
3552 struct ata_device *dev;
3553
3554 ata_for_each_dev(dev, link, ALL) {
3555 unsigned long flags;
3556
3557 if (!(dev->flags & ATA_DFLAG_DETACHED))
3558 continue;
3559
3560 spin_lock_irqsave(ap->lock, flags);
3561 dev->flags &= ~ATA_DFLAG_DETACHED;
3562 spin_unlock_irqrestore(ap->lock, flags);
3563
3564 ata_scsi_remove_dev(dev);
3565 }
3566 }
3567
3568 /**
3569 * ata_scsi_media_change_notify - send media change event
3570 * @dev: Pointer to the disk device with media change event
3571 *
3572 * Tell the block layer to send a media change notification
3573 * event.
3574 *
3575 * LOCKING:
3576 * spin_lock_irqsave(host lock)
3577 */
3578 void ata_scsi_media_change_notify(struct ata_device *dev)
3579 {
3580 if (dev->sdev)
3581 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3582 GFP_ATOMIC);
3583 }
3584
3585 /**
3586 * ata_scsi_hotplug - SCSI part of hotplug
3587 * @work: Pointer to ATA port to perform SCSI hotplug on
3588 *
3589 * Perform SCSI part of hotplug. It's executed from a separate
3590 * workqueue after EH completes. This is necessary because SCSI
3591 * hot plugging requires working EH and hot unplugging is
3592 * synchronized with hot plugging with a mutex.
3593 *
3594 * LOCKING:
3595 * Kernel thread context (may sleep).
3596 */
3597 void ata_scsi_hotplug(struct work_struct *work)
3598 {
3599 struct ata_port *ap =
3600 container_of(work, struct ata_port, hotplug_task.work);
3601 int i;
3602
3603 if (ap->pflags & ATA_PFLAG_UNLOADING) {
3604 DPRINTK("ENTER/EXIT - unloading\n");
3605 return;
3606 }
3607
3608 DPRINTK("ENTER\n");
3609 mutex_lock(&ap->scsi_scan_mutex);
3610
3611 /* Unplug detached devices. We cannot use link iterator here
3612 * because PMP links have to be scanned even if PMP is
3613 * currently not attached. Iterate manually.
3614 */
3615 ata_scsi_handle_link_detach(&ap->link);
3616 if (ap->pmp_link)
3617 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3618 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3619
3620 /* scan for new ones */
3621 ata_scsi_scan_host(ap, 0);
3622
3623 mutex_unlock(&ap->scsi_scan_mutex);
3624 DPRINTK("EXIT\n");
3625 }
3626
3627 /**
3628 * ata_scsi_user_scan - indication for user-initiated bus scan
3629 * @shost: SCSI host to scan
3630 * @channel: Channel to scan
3631 * @id: ID to scan
3632 * @lun: LUN to scan
3633 *
3634 * This function is called when user explicitly requests bus
3635 * scan. Set probe pending flag and invoke EH.
3636 *
3637 * LOCKING:
3638 * SCSI layer (we don't care)
3639 *
3640 * RETURNS:
3641 * Zero.
3642 */
3643 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3644 unsigned int id, unsigned int lun)
3645 {
3646 struct ata_port *ap = ata_shost_to_port(shost);
3647 unsigned long flags;
3648 int devno, rc = 0;
3649
3650 if (!ap->ops->error_handler)
3651 return -EOPNOTSUPP;
3652
3653 if (lun != SCAN_WILD_CARD && lun)
3654 return -EINVAL;
3655
3656 if (!sata_pmp_attached(ap)) {
3657 if (channel != SCAN_WILD_CARD && channel)
3658 return -EINVAL;
3659 devno = id;
3660 } else {
3661 if (id != SCAN_WILD_CARD && id)
3662 return -EINVAL;
3663 devno = channel;
3664 }
3665
3666 spin_lock_irqsave(ap->lock, flags);
3667
3668 if (devno == SCAN_WILD_CARD) {
3669 struct ata_link *link;
3670
3671 ata_for_each_link(link, ap, EDGE) {
3672 struct ata_eh_info *ehi = &link->eh_info;
3673 ehi->probe_mask |= ATA_ALL_DEVICES;
3674 ehi->action |= ATA_EH_RESET;
3675 }
3676 } else {
3677 struct ata_device *dev = ata_find_dev(ap, devno);
3678
3679 if (dev) {
3680 struct ata_eh_info *ehi = &dev->link->eh_info;
3681 ehi->probe_mask |= 1 << dev->devno;
3682 ehi->action |= ATA_EH_RESET;
3683 } else
3684 rc = -EINVAL;
3685 }
3686
3687 if (rc == 0) {
3688 ata_port_schedule_eh(ap);
3689 spin_unlock_irqrestore(ap->lock, flags);
3690 ata_port_wait_eh(ap);
3691 } else
3692 spin_unlock_irqrestore(ap->lock, flags);
3693
3694 return rc;
3695 }
3696
3697 /**
3698 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3699 * @work: Pointer to ATA port to perform scsi_rescan_device()
3700 *
3701 * After ATA pass thru (SAT) commands are executed successfully,
3702 * libata need to propagate the changes to SCSI layer.
3703 *
3704 * LOCKING:
3705 * Kernel thread context (may sleep).
3706 */
3707 void ata_scsi_dev_rescan(struct work_struct *work)
3708 {
3709 struct ata_port *ap =
3710 container_of(work, struct ata_port, scsi_rescan_task);
3711 struct ata_link *link;
3712 struct ata_device *dev;
3713 unsigned long flags;
3714
3715 mutex_lock(&ap->scsi_scan_mutex);
3716 spin_lock_irqsave(ap->lock, flags);
3717
3718 ata_for_each_link(link, ap, EDGE) {
3719 ata_for_each_dev(dev, link, ENABLED) {
3720 struct scsi_device *sdev = dev->sdev;
3721
3722 if (!sdev)
3723 continue;
3724 if (scsi_device_get(sdev))
3725 continue;
3726
3727 spin_unlock_irqrestore(ap->lock, flags);
3728 scsi_rescan_device(&(sdev->sdev_gendev));
3729 scsi_device_put(sdev);
3730 spin_lock_irqsave(ap->lock, flags);
3731 }
3732 }
3733
3734 spin_unlock_irqrestore(ap->lock, flags);
3735 mutex_unlock(&ap->scsi_scan_mutex);
3736 }
3737
3738 /**
3739 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3740 * @host: ATA host container for all SAS ports
3741 * @port_info: Information from low-level host driver
3742 * @shost: SCSI host that the scsi device is attached to
3743 *
3744 * LOCKING:
3745 * PCI/etc. bus probe sem.
3746 *
3747 * RETURNS:
3748 * ata_port pointer on success / NULL on failure.
3749 */
3750
3751 struct ata_port *ata_sas_port_alloc(struct ata_host *host,
3752 struct ata_port_info *port_info,
3753 struct Scsi_Host *shost)
3754 {
3755 struct ata_port *ap;
3756
3757 ap = ata_port_alloc(host);
3758 if (!ap)
3759 return NULL;
3760
3761 ap->port_no = 0;
3762 ap->lock = shost->host_lock;
3763 ap->pio_mask = port_info->pio_mask;
3764 ap->mwdma_mask = port_info->mwdma_mask;
3765 ap->udma_mask = port_info->udma_mask;
3766 ap->flags |= port_info->flags;
3767 ap->ops = port_info->port_ops;
3768 ap->cbl = ATA_CBL_SATA;
3769
3770 return ap;
3771 }
3772 EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3773
3774 /**
3775 * ata_sas_port_start - Set port up for dma.
3776 * @ap: Port to initialize
3777 *
3778 * Called just after data structures for each port are
3779 * initialized.
3780 *
3781 * May be used as the port_start() entry in ata_port_operations.
3782 *
3783 * LOCKING:
3784 * Inherited from caller.
3785 */
3786 int ata_sas_port_start(struct ata_port *ap)
3787 {
3788 return 0;
3789 }
3790 EXPORT_SYMBOL_GPL(ata_sas_port_start);
3791
3792 /**
3793 * ata_port_stop - Undo ata_sas_port_start()
3794 * @ap: Port to shut down
3795 *
3796 * May be used as the port_stop() entry in ata_port_operations.
3797 *
3798 * LOCKING:
3799 * Inherited from caller.
3800 */
3801
3802 void ata_sas_port_stop(struct ata_port *ap)
3803 {
3804 }
3805 EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3806
3807 /**
3808 * ata_sas_port_init - Initialize a SATA device
3809 * @ap: SATA port to initialize
3810 *
3811 * LOCKING:
3812 * PCI/etc. bus probe sem.
3813 *
3814 * RETURNS:
3815 * Zero on success, non-zero on error.
3816 */
3817
3818 int ata_sas_port_init(struct ata_port *ap)
3819 {
3820 int rc = ap->ops->port_start(ap);
3821
3822 if (!rc) {
3823 ap->print_id = ata_print_id++;
3824 rc = ata_bus_probe(ap);
3825 }
3826
3827 return rc;
3828 }
3829 EXPORT_SYMBOL_GPL(ata_sas_port_init);
3830
3831 /**
3832 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3833 * @ap: SATA port to destroy
3834 *
3835 */
3836
3837 void ata_sas_port_destroy(struct ata_port *ap)
3838 {
3839 if (ap->ops->port_stop)
3840 ap->ops->port_stop(ap);
3841 kfree(ap);
3842 }
3843 EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3844
3845 /**
3846 * ata_sas_slave_configure - Default slave_config routine for libata devices
3847 * @sdev: SCSI device to configure
3848 * @ap: ATA port to which SCSI device is attached
3849 *
3850 * RETURNS:
3851 * Zero.
3852 */
3853
3854 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
3855 {
3856 ata_scsi_sdev_config(sdev);
3857 ata_scsi_dev_config(sdev, ap->link.device);
3858 return 0;
3859 }
3860 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3861
3862 /**
3863 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3864 * @cmd: SCSI command to be sent
3865 * @ap: ATA port to which the command is being sent
3866 *
3867 * RETURNS:
3868 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3869 * 0 otherwise.
3870 */
3871
3872 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
3873 {
3874 int rc = 0;
3875
3876 ata_scsi_dump_cdb(ap, cmd);
3877
3878 if (likely(ata_dev_enabled(ap->link.device)))
3879 rc = __ata_scsi_queuecmd(cmd, ap->link.device);
3880 else {
3881 cmd->result = (DID_BAD_TARGET << 16);
3882 cmd->scsi_done(cmd);
3883 }
3884 return rc;
3885 }
3886 EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree