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xen/smp/pvhvm: Don't initialize IRQ_WORKER as we are using the native one.
[linux-2.6/btrfs-unstable.git] / drivers / ata / libata-scsi.c
blob318b41358187739fe0671fe1c0be118668575da8
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 <linux/export.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_eh.h>
45 #include <scsi/scsi_device.h>
46 #include <scsi/scsi_tcq.h>
47 #include <scsi/scsi_transport.h>
48 #include <linux/libata.h>
49 #include <linux/hdreg.h>
50 #include <linux/uaccess.h>
51 #include <linux/suspend.h>
52 #include <asm/unaligned.h>
53
54 #include "libata.h"
55 #include "libata-transport.h"
56
57 #define ATA_SCSI_RBUF_SIZE 4096
58
59 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
60 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
61
62 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
63
64 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
65 const struct scsi_device *scsidev);
66 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
67 const struct scsi_device *scsidev);
68
69 #define RW_RECOVERY_MPAGE 0x1
70 #define RW_RECOVERY_MPAGE_LEN 12
71 #define CACHE_MPAGE 0x8
72 #define CACHE_MPAGE_LEN 20
73 #define CONTROL_MPAGE 0xa
74 #define CONTROL_MPAGE_LEN 12
75 #define ALL_MPAGES 0x3f
76 #define ALL_SUB_MPAGES 0xff
77
78
79 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
80 RW_RECOVERY_MPAGE,
81 RW_RECOVERY_MPAGE_LEN - 2,
82 (1 << 7), /* AWRE */
83 0, /* read retry count */
84 0, 0, 0, 0,
85 0, /* write retry count */
86 0, 0, 0
87 };
88
89 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
90 CACHE_MPAGE,
91 CACHE_MPAGE_LEN - 2,
92 0, /* contains WCE, needs to be 0 for logic */
93 0, 0, 0, 0, 0, 0, 0, 0, 0,
94 0, /* contains DRA, needs to be 0 for logic */
95 0, 0, 0, 0, 0, 0, 0
96 };
97
98 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
99 CONTROL_MPAGE,
100 CONTROL_MPAGE_LEN - 2,
101 2, /* DSENSE=0, GLTSD=1 */
102 0, /* [QAM+QERR may be 1, see 05-359r1] */
103 0, 0, 0, 0, 0xff, 0xff,
104 0, 30 /* extended self test time, see 05-359r1 */
105 };
106
107 static const char *ata_lpm_policy_names[] = {
108 [ATA_LPM_UNKNOWN] = "max_performance",
109 [ATA_LPM_MAX_POWER] = "max_performance",
110 [ATA_LPM_MED_POWER] = "medium_power",
111 [ATA_LPM_MIN_POWER] = "min_power",
112 };
113
114 static ssize_t ata_scsi_lpm_store(struct device *dev,
115 struct device_attribute *attr,
116 const char *buf, size_t count)
117 {
118 struct Scsi_Host *shost = class_to_shost(dev);
119 struct ata_port *ap = ata_shost_to_port(shost);
120 enum ata_lpm_policy policy;
121 unsigned long flags;
122
123 /* UNKNOWN is internal state, iterate from MAX_POWER */
124 for (policy = ATA_LPM_MAX_POWER;
125 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
126 const char *name = ata_lpm_policy_names[policy];
127
128 if (strncmp(name, buf, strlen(name)) == 0)
129 break;
130 }
131 if (policy == ARRAY_SIZE(ata_lpm_policy_names))
132 return -EINVAL;
133
134 spin_lock_irqsave(ap->lock, flags);
135 ap->target_lpm_policy = policy;
136 ata_port_schedule_eh(ap);
137 spin_unlock_irqrestore(ap->lock, flags);
138
139 return count;
140 }
141
142 static ssize_t ata_scsi_lpm_show(struct device *dev,
143 struct device_attribute *attr, char *buf)
144 {
145 struct Scsi_Host *shost = class_to_shost(dev);
146 struct ata_port *ap = ata_shost_to_port(shost);
147
148 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
149 return -EINVAL;
150
151 return snprintf(buf, PAGE_SIZE, "%s\n",
152 ata_lpm_policy_names[ap->target_lpm_policy]);
153 }
154 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
155 ata_scsi_lpm_show, ata_scsi_lpm_store);
156 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
157
158 static ssize_t ata_scsi_park_show(struct device *device,
159 struct device_attribute *attr, char *buf)
160 {
161 struct scsi_device *sdev = to_scsi_device(device);
162 struct ata_port *ap;
163 struct ata_link *link;
164 struct ata_device *dev;
165 unsigned long flags, now;
166 unsigned int uninitialized_var(msecs);
167 int rc = 0;
168
169 ap = ata_shost_to_port(sdev->host);
170
171 spin_lock_irqsave(ap->lock, flags);
172 dev = ata_scsi_find_dev(ap, sdev);
173 if (!dev) {
174 rc = -ENODEV;
175 goto unlock;
176 }
177 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
178 rc = -EOPNOTSUPP;
179 goto unlock;
180 }
181
182 link = dev->link;
183 now = jiffies;
184 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
185 link->eh_context.unloaded_mask & (1 << dev->devno) &&
186 time_after(dev->unpark_deadline, now))
187 msecs = jiffies_to_msecs(dev->unpark_deadline - now);
188 else
189 msecs = 0;
190
191 unlock:
192 spin_unlock_irq(ap->lock);
193
194 return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
195 }
196
197 static ssize_t ata_scsi_park_store(struct device *device,
198 struct device_attribute *attr,
199 const char *buf, size_t len)
200 {
201 struct scsi_device *sdev = to_scsi_device(device);
202 struct ata_port *ap;
203 struct ata_device *dev;
204 long int input;
205 unsigned long flags;
206 int rc;
207
208 rc = strict_strtol(buf, 10, &input);
209 if (rc || input < -2)
210 return -EINVAL;
211 if (input > ATA_TMOUT_MAX_PARK) {
212 rc = -EOVERFLOW;
213 input = ATA_TMOUT_MAX_PARK;
214 }
215
216 ap = ata_shost_to_port(sdev->host);
217
218 spin_lock_irqsave(ap->lock, flags);
219 dev = ata_scsi_find_dev(ap, sdev);
220 if (unlikely(!dev)) {
221 rc = -ENODEV;
222 goto unlock;
223 }
224 if (dev->class != ATA_DEV_ATA) {
225 rc = -EOPNOTSUPP;
226 goto unlock;
227 }
228
229 if (input >= 0) {
230 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
231 rc = -EOPNOTSUPP;
232 goto unlock;
233 }
234
235 dev->unpark_deadline = ata_deadline(jiffies, input);
236 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
237 ata_port_schedule_eh(ap);
238 complete(&ap->park_req_pending);
239 } else {
240 switch (input) {
241 case -1:
242 dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
243 break;
244 case -2:
245 dev->flags |= ATA_DFLAG_NO_UNLOAD;
246 break;
247 }
248 }
249 unlock:
250 spin_unlock_irqrestore(ap->lock, flags);
251
252 return rc ? rc : len;
253 }
254 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
255 ata_scsi_park_show, ata_scsi_park_store);
256 EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
257
258 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
259 {
260 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
261
262 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
263 }
264
265 static ssize_t
266 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
267 const char *buf, size_t count)
268 {
269 struct Scsi_Host *shost = class_to_shost(dev);
270 struct ata_port *ap = ata_shost_to_port(shost);
271 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
272 return ap->ops->em_store(ap, buf, count);
273 return -EINVAL;
274 }
275
276 static ssize_t
277 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
278 char *buf)
279 {
280 struct Scsi_Host *shost = class_to_shost(dev);
281 struct ata_port *ap = ata_shost_to_port(shost);
282
283 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
284 return ap->ops->em_show(ap, buf);
285 return -EINVAL;
286 }
287 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
288 ata_scsi_em_message_show, ata_scsi_em_message_store);
289 EXPORT_SYMBOL_GPL(dev_attr_em_message);
290
291 static ssize_t
292 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
293 char *buf)
294 {
295 struct Scsi_Host *shost = class_to_shost(dev);
296 struct ata_port *ap = ata_shost_to_port(shost);
297
298 return snprintf(buf, 23, "%d\n", ap->em_message_type);
299 }
300 DEVICE_ATTR(em_message_type, S_IRUGO,
301 ata_scsi_em_message_type_show, NULL);
302 EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
303
304 static ssize_t
305 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
306 char *buf)
307 {
308 struct scsi_device *sdev = to_scsi_device(dev);
309 struct ata_port *ap = ata_shost_to_port(sdev->host);
310 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
311
312 if (atadev && ap->ops->sw_activity_show &&
313 (ap->flags & ATA_FLAG_SW_ACTIVITY))
314 return ap->ops->sw_activity_show(atadev, buf);
315 return -EINVAL;
316 }
317
318 static ssize_t
319 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
320 const char *buf, size_t count)
321 {
322 struct scsi_device *sdev = to_scsi_device(dev);
323 struct ata_port *ap = ata_shost_to_port(sdev->host);
324 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
325 enum sw_activity val;
326 int rc;
327
328 if (atadev && ap->ops->sw_activity_store &&
329 (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
330 val = simple_strtoul(buf, NULL, 0);
331 switch (val) {
332 case OFF: case BLINK_ON: case BLINK_OFF:
333 rc = ap->ops->sw_activity_store(atadev, val);
334 if (!rc)
335 return count;
336 else
337 return rc;
338 }
339 }
340 return -EINVAL;
341 }
342 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
343 ata_scsi_activity_store);
344 EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
345
346 struct device_attribute *ata_common_sdev_attrs[] = {
347 &dev_attr_unload_heads,
348 NULL
349 };
350 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
351
352 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd)
353 {
354 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
355 /* "Invalid field in cbd" */
356 cmd->scsi_done(cmd);
357 }
358
359 /**
360 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
361 * @sdev: SCSI device for which BIOS geometry is to be determined
362 * @bdev: block device associated with @sdev
363 * @capacity: capacity of SCSI device
364 * @geom: location to which geometry will be output
365 *
366 * Generic bios head/sector/cylinder calculator
367 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
368 * mapping. Some situations may arise where the disk is not
369 * bootable if this is not used.
370 *
371 * LOCKING:
372 * Defined by the SCSI layer. We don't really care.
373 *
374 * RETURNS:
375 * Zero.
376 */
377 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
378 sector_t capacity, int geom[])
379 {
380 geom[0] = 255;
381 geom[1] = 63;
382 sector_div(capacity, 255*63);
383 geom[2] = capacity;
384
385 return 0;
386 }
387
388 /**
389 * ata_scsi_unlock_native_capacity - unlock native capacity
390 * @sdev: SCSI device to adjust device capacity for
391 *
392 * This function is called if a partition on @sdev extends beyond
393 * the end of the device. It requests EH to unlock HPA.
394 *
395 * LOCKING:
396 * Defined by the SCSI layer. Might sleep.
397 */
398 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
399 {
400 struct ata_port *ap = ata_shost_to_port(sdev->host);
401 struct ata_device *dev;
402 unsigned long flags;
403
404 spin_lock_irqsave(ap->lock, flags);
405
406 dev = ata_scsi_find_dev(ap, sdev);
407 if (dev && dev->n_sectors < dev->n_native_sectors) {
408 dev->flags |= ATA_DFLAG_UNLOCK_HPA;
409 dev->link->eh_info.action |= ATA_EH_RESET;
410 ata_port_schedule_eh(ap);
411 }
412
413 spin_unlock_irqrestore(ap->lock, flags);
414 ata_port_wait_eh(ap);
415 }
416
417 /**
418 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
419 * @ap: target port
420 * @sdev: SCSI device to get identify data for
421 * @arg: User buffer area for identify data
422 *
423 * LOCKING:
424 * Defined by the SCSI layer. We don't really care.
425 *
426 * RETURNS:
427 * Zero on success, negative errno on error.
428 */
429 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
430 void __user *arg)
431 {
432 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
433 u16 __user *dst = arg;
434 char buf[40];
435
436 if (!dev)
437 return -ENOMSG;
438
439 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
440 return -EFAULT;
441
442 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
443 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
444 return -EFAULT;
445
446 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
447 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
448 return -EFAULT;
449
450 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
451 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
452 return -EFAULT;
453
454 return 0;
455 }
456
457 /**
458 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
459 * @scsidev: Device to which we are issuing command
460 * @arg: User provided data for issuing command
461 *
462 * LOCKING:
463 * Defined by the SCSI layer. We don't really care.
464 *
465 * RETURNS:
466 * Zero on success, negative errno on error.
467 */
468 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
469 {
470 int rc = 0;
471 u8 scsi_cmd[MAX_COMMAND_SIZE];
472 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
473 int argsize = 0;
474 enum dma_data_direction data_dir;
475 int cmd_result;
476
477 if (arg == NULL)
478 return -EINVAL;
479
480 if (copy_from_user(args, arg, sizeof(args)))
481 return -EFAULT;
482
483 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
484 if (!sensebuf)
485 return -ENOMEM;
486
487 memset(scsi_cmd, 0, sizeof(scsi_cmd));
488
489 if (args[3]) {
490 argsize = ATA_SECT_SIZE * args[3];
491 argbuf = kmalloc(argsize, GFP_KERNEL);
492 if (argbuf == NULL) {
493 rc = -ENOMEM;
494 goto error;
495 }
496
497 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
498 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
499 block count in sector count field */
500 data_dir = DMA_FROM_DEVICE;
501 } else {
502 scsi_cmd[1] = (3 << 1); /* Non-data */
503 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
504 data_dir = DMA_NONE;
505 }
506
507 scsi_cmd[0] = ATA_16;
508
509 scsi_cmd[4] = args[2];
510 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
511 scsi_cmd[6] = args[3];
512 scsi_cmd[8] = args[1];
513 scsi_cmd[10] = 0x4f;
514 scsi_cmd[12] = 0xc2;
515 } else {
516 scsi_cmd[6] = args[1];
517 }
518 scsi_cmd[14] = args[0];
519
520 /* Good values for timeout and retries? Values below
521 from scsi_ioctl_send_command() for default case... */
522 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
523 sensebuf, (10*HZ), 5, 0, NULL);
524
525 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
526 u8 *desc = sensebuf + 8;
527 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
528
529 /* If we set cc then ATA pass-through will cause a
530 * check condition even if no error. Filter that. */
531 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
532 struct scsi_sense_hdr sshdr;
533 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
534 &sshdr);
535 if (sshdr.sense_key == 0 &&
536 sshdr.asc == 0 && sshdr.ascq == 0)
537 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
538 }
539
540 /* Send userspace a few ATA registers (same as drivers/ide) */
541 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
542 desc[0] == 0x09) { /* code is "ATA Descriptor" */
543 args[0] = desc[13]; /* status */
544 args[1] = desc[3]; /* error */
545 args[2] = desc[5]; /* sector count (0:7) */
546 if (copy_to_user(arg, args, sizeof(args)))
547 rc = -EFAULT;
548 }
549 }
550
551
552 if (cmd_result) {
553 rc = -EIO;
554 goto error;
555 }
556
557 if ((argbuf)
558 && copy_to_user(arg + sizeof(args), argbuf, argsize))
559 rc = -EFAULT;
560 error:
561 kfree(sensebuf);
562 kfree(argbuf);
563 return rc;
564 }
565
566 /**
567 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
568 * @scsidev: Device to which we are issuing command
569 * @arg: User provided data for issuing command
570 *
571 * LOCKING:
572 * Defined by the SCSI layer. We don't really care.
573 *
574 * RETURNS:
575 * Zero on success, negative errno on error.
576 */
577 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
578 {
579 int rc = 0;
580 u8 scsi_cmd[MAX_COMMAND_SIZE];
581 u8 args[7], *sensebuf = NULL;
582 int cmd_result;
583
584 if (arg == NULL)
585 return -EINVAL;
586
587 if (copy_from_user(args, arg, sizeof(args)))
588 return -EFAULT;
589
590 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
591 if (!sensebuf)
592 return -ENOMEM;
593
594 memset(scsi_cmd, 0, sizeof(scsi_cmd));
595 scsi_cmd[0] = ATA_16;
596 scsi_cmd[1] = (3 << 1); /* Non-data */
597 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
598 scsi_cmd[4] = args[1];
599 scsi_cmd[6] = args[2];
600 scsi_cmd[8] = args[3];
601 scsi_cmd[10] = args[4];
602 scsi_cmd[12] = args[5];
603 scsi_cmd[13] = args[6] & 0x4f;
604 scsi_cmd[14] = args[0];
605
606 /* Good values for timeout and retries? Values below
607 from scsi_ioctl_send_command() for default case... */
608 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
609 sensebuf, (10*HZ), 5, 0, NULL);
610
611 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
612 u8 *desc = sensebuf + 8;
613 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
614
615 /* If we set cc then ATA pass-through will cause a
616 * check condition even if no error. Filter that. */
617 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
618 struct scsi_sense_hdr sshdr;
619 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
620 &sshdr);
621 if (sshdr.sense_key == 0 &&
622 sshdr.asc == 0 && sshdr.ascq == 0)
623 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
624 }
625
626 /* Send userspace ATA registers */
627 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
628 desc[0] == 0x09) {/* code is "ATA Descriptor" */
629 args[0] = desc[13]; /* status */
630 args[1] = desc[3]; /* error */
631 args[2] = desc[5]; /* sector count (0:7) */
632 args[3] = desc[7]; /* lbal */
633 args[4] = desc[9]; /* lbam */
634 args[5] = desc[11]; /* lbah */
635 args[6] = desc[12]; /* select */
636 if (copy_to_user(arg, args, sizeof(args)))
637 rc = -EFAULT;
638 }
639 }
640
641 if (cmd_result) {
642 rc = -EIO;
643 goto error;
644 }
645
646 error:
647 kfree(sensebuf);
648 return rc;
649 }
650
651 static int ata_ioc32(struct ata_port *ap)
652 {
653 if (ap->flags & ATA_FLAG_PIO_DMA)
654 return 1;
655 if (ap->pflags & ATA_PFLAG_PIO32)
656 return 1;
657 return 0;
658 }
659
660 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
661 int cmd, void __user *arg)
662 {
663 int val = -EINVAL, rc = -EINVAL;
664 unsigned long flags;
665
666 switch (cmd) {
667 case ATA_IOC_GET_IO32:
668 spin_lock_irqsave(ap->lock, flags);
669 val = ata_ioc32(ap);
670 spin_unlock_irqrestore(ap->lock, flags);
671 if (copy_to_user(arg, &val, 1))
672 return -EFAULT;
673 return 0;
674
675 case ATA_IOC_SET_IO32:
676 val = (unsigned long) arg;
677 rc = 0;
678 spin_lock_irqsave(ap->lock, flags);
679 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
680 if (val)
681 ap->pflags |= ATA_PFLAG_PIO32;
682 else
683 ap->pflags &= ~ATA_PFLAG_PIO32;
684 } else {
685 if (val != ata_ioc32(ap))
686 rc = -EINVAL;
687 }
688 spin_unlock_irqrestore(ap->lock, flags);
689 return rc;
690
691 case HDIO_GET_IDENTITY:
692 return ata_get_identity(ap, scsidev, arg);
693
694 case HDIO_DRIVE_CMD:
695 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
696 return -EACCES;
697 return ata_cmd_ioctl(scsidev, arg);
698
699 case HDIO_DRIVE_TASK:
700 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
701 return -EACCES;
702 return ata_task_ioctl(scsidev, arg);
703
704 default:
705 rc = -ENOTTY;
706 break;
707 }
708
709 return rc;
710 }
711 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
712
713 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
714 {
715 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
716 scsidev, cmd, arg);
717 }
718 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
719
720 /**
721 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
722 * @dev: ATA device to which the new command is attached
723 * @cmd: SCSI command that originated this ATA command
724 *
725 * Obtain a reference to an unused ata_queued_cmd structure,
726 * which is the basic libata structure representing a single
727 * ATA command sent to the hardware.
728 *
729 * If a command was available, fill in the SCSI-specific
730 * portions of the structure with information on the
731 * current command.
732 *
733 * LOCKING:
734 * spin_lock_irqsave(host lock)
735 *
736 * RETURNS:
737 * Command allocated, or %NULL if none available.
738 */
739 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
740 struct scsi_cmnd *cmd)
741 {
742 struct ata_queued_cmd *qc;
743
744 qc = ata_qc_new_init(dev);
745 if (qc) {
746 qc->scsicmd = cmd;
747 qc->scsidone = cmd->scsi_done;
748
749 qc->sg = scsi_sglist(cmd);
750 qc->n_elem = scsi_sg_count(cmd);
751 } else {
752 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
753 cmd->scsi_done(cmd);
754 }
755
756 return qc;
757 }
758
759 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
760 {
761 struct scsi_cmnd *scmd = qc->scsicmd;
762
763 qc->extrabytes = scmd->request->extra_len;
764 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
765 }
766
767 /**
768 * ata_dump_status - user friendly display of error info
769 * @id: id of the port in question
770 * @tf: ptr to filled out taskfile
771 *
772 * Decode and dump the ATA error/status registers for the user so
773 * that they have some idea what really happened at the non
774 * make-believe layer.
775 *
776 * LOCKING:
777 * inherited from caller
778 */
779 static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
780 {
781 u8 stat = tf->command, err = tf->feature;
782
783 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
784 if (stat & ATA_BUSY) {
785 printk("Busy }\n"); /* Data is not valid in this case */
786 } else {
787 if (stat & 0x40) printk("DriveReady ");
788 if (stat & 0x20) printk("DeviceFault ");
789 if (stat & 0x10) printk("SeekComplete ");
790 if (stat & 0x08) printk("DataRequest ");
791 if (stat & 0x04) printk("CorrectedError ");
792 if (stat & 0x02) printk("Index ");
793 if (stat & 0x01) printk("Error ");
794 printk("}\n");
795
796 if (err) {
797 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
798 if (err & 0x04) printk("DriveStatusError ");
799 if (err & 0x80) {
800 if (err & 0x04) printk("BadCRC ");
801 else printk("Sector ");
802 }
803 if (err & 0x40) printk("UncorrectableError ");
804 if (err & 0x10) printk("SectorIdNotFound ");
805 if (err & 0x02) printk("TrackZeroNotFound ");
806 if (err & 0x01) printk("AddrMarkNotFound ");
807 printk("}\n");
808 }
809 }
810 }
811
812 /**
813 * ata_to_sense_error - convert ATA error to SCSI error
814 * @id: ATA device number
815 * @drv_stat: value contained in ATA status register
816 * @drv_err: value contained in ATA error register
817 * @sk: the sense key we'll fill out
818 * @asc: the additional sense code we'll fill out
819 * @ascq: the additional sense code qualifier we'll fill out
820 * @verbose: be verbose
821 *
822 * Converts an ATA error into a SCSI error. Fill out pointers to
823 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
824 * format sense blocks.
825 *
826 * LOCKING:
827 * spin_lock_irqsave(host lock)
828 */
829 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
830 u8 *asc, u8 *ascq, int verbose)
831 {
832 int i;
833
834 /* Based on the 3ware driver translation table */
835 static const unsigned char sense_table[][4] = {
836 /* BBD|ECC|ID|MAR */
837 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
838 /* BBD|ECC|ID */
839 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
840 /* ECC|MC|MARK */
841 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
842 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
843 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
844 /* MC|ID|ABRT|TRK0|MARK */
845 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
846 /* MCR|MARK */
847 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
848 /* Bad address mark */
849 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
850 /* TRK0 */
851 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
852 /* Abort & !ICRC */
853 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
854 /* Media change request */
855 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
856 /* SRV */
857 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
858 /* Media change */
859 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
860 /* ECC */
861 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
862 /* BBD - block marked bad */
863 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
864 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
865 };
866 static const unsigned char stat_table[][4] = {
867 /* Must be first because BUSY means no other bits valid */
868 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
869 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
870 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
871 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
872 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
873 };
874
875 /*
876 * Is this an error we can process/parse
877 */
878 if (drv_stat & ATA_BUSY) {
879 drv_err = 0; /* Ignore the err bits, they're invalid */
880 }
881
882 if (drv_err) {
883 /* Look for drv_err */
884 for (i = 0; sense_table[i][0] != 0xFF; i++) {
885 /* Look for best matches first */
886 if ((sense_table[i][0] & drv_err) ==
887 sense_table[i][0]) {
888 *sk = sense_table[i][1];
889 *asc = sense_table[i][2];
890 *ascq = sense_table[i][3];
891 goto translate_done;
892 }
893 }
894 /* No immediate match */
895 if (verbose)
896 printk(KERN_WARNING "ata%u: no sense translation for "
897 "error 0x%02x\n", id, drv_err);
898 }
899
900 /* Fall back to interpreting status bits */
901 for (i = 0; stat_table[i][0] != 0xFF; i++) {
902 if (stat_table[i][0] & drv_stat) {
903 *sk = stat_table[i][1];
904 *asc = stat_table[i][2];
905 *ascq = stat_table[i][3];
906 goto translate_done;
907 }
908 }
909 /* No error? Undecoded? */
910 if (verbose)
911 printk(KERN_WARNING "ata%u: no sense translation for "
912 "status: 0x%02x\n", id, drv_stat);
913
914 /* We need a sensible error return here, which is tricky, and one
915 that won't cause people to do things like return a disk wrongly */
916 *sk = ABORTED_COMMAND;
917 *asc = 0x00;
918 *ascq = 0x00;
919
920 translate_done:
921 if (verbose)
922 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
923 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
924 id, drv_stat, drv_err, *sk, *asc, *ascq);
925 return;
926 }
927
928 /*
929 * ata_gen_passthru_sense - Generate check condition sense block.
930 * @qc: Command that completed.
931 *
932 * This function is specific to the ATA descriptor format sense
933 * block specified for the ATA pass through commands. Regardless
934 * of whether the command errored or not, return a sense
935 * block. Copy all controller registers into the sense
936 * block. If there was no error, we get the request from an ATA
937 * passthrough command, so we use the following sense data:
938 * sk = RECOVERED ERROR
939 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
940 *
941 *
942 * LOCKING:
943 * None.
944 */
945 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
946 {
947 struct scsi_cmnd *cmd = qc->scsicmd;
948 struct ata_taskfile *tf = &qc->result_tf;
949 unsigned char *sb = cmd->sense_buffer;
950 unsigned char *desc = sb + 8;
951 int verbose = qc->ap->ops->error_handler == NULL;
952
953 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
954
955 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
956
957 /*
958 * Use ata_to_sense_error() to map status register bits
959 * onto sense key, asc & ascq.
960 */
961 if (qc->err_mask ||
962 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
963 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
964 &sb[1], &sb[2], &sb[3], verbose);
965 sb[1] &= 0x0f;
966 } else {
967 sb[1] = RECOVERED_ERROR;
968 sb[2] = 0;
969 sb[3] = 0x1D;
970 }
971
972 /*
973 * Sense data is current and format is descriptor.
974 */
975 sb[0] = 0x72;
976
977 desc[0] = 0x09;
978
979 /* set length of additional sense data */
980 sb[7] = 14;
981 desc[1] = 12;
982
983 /*
984 * Copy registers into sense buffer.
985 */
986 desc[2] = 0x00;
987 desc[3] = tf->feature; /* == error reg */
988 desc[5] = tf->nsect;
989 desc[7] = tf->lbal;
990 desc[9] = tf->lbam;
991 desc[11] = tf->lbah;
992 desc[12] = tf->device;
993 desc[13] = tf->command; /* == status reg */
994
995 /*
996 * Fill in Extend bit, and the high order bytes
997 * if applicable.
998 */
999 if (tf->flags & ATA_TFLAG_LBA48) {
1000 desc[2] |= 0x01;
1001 desc[4] = tf->hob_nsect;
1002 desc[6] = tf->hob_lbal;
1003 desc[8] = tf->hob_lbam;
1004 desc[10] = tf->hob_lbah;
1005 }
1006 }
1007
1008 /**
1009 * ata_gen_ata_sense - generate a SCSI fixed sense block
1010 * @qc: Command that we are erroring out
1011 *
1012 * Generate sense block for a failed ATA command @qc. Descriptor
1013 * format is used to accommodate LBA48 block address.
1014 *
1015 * LOCKING:
1016 * None.
1017 */
1018 static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
1019 {
1020 struct ata_device *dev = qc->dev;
1021 struct scsi_cmnd *cmd = qc->scsicmd;
1022 struct ata_taskfile *tf = &qc->result_tf;
1023 unsigned char *sb = cmd->sense_buffer;
1024 unsigned char *desc = sb + 8;
1025 int verbose = qc->ap->ops->error_handler == NULL;
1026 u64 block;
1027
1028 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1029
1030 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
1031
1032 /* sense data is current and format is descriptor */
1033 sb[0] = 0x72;
1034
1035 /* Use ata_to_sense_error() to map status register bits
1036 * onto sense key, asc & ascq.
1037 */
1038 if (qc->err_mask ||
1039 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
1040 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
1041 &sb[1], &sb[2], &sb[3], verbose);
1042 sb[1] &= 0x0f;
1043 }
1044
1045 block = ata_tf_read_block(&qc->result_tf, dev);
1046
1047 /* information sense data descriptor */
1048 sb[7] = 12;
1049 desc[0] = 0x00;
1050 desc[1] = 10;
1051
1052 desc[2] |= 0x80; /* valid */
1053 desc[6] = block >> 40;
1054 desc[7] = block >> 32;
1055 desc[8] = block >> 24;
1056 desc[9] = block >> 16;
1057 desc[10] = block >> 8;
1058 desc[11] = block;
1059 }
1060
1061 static void ata_scsi_sdev_config(struct scsi_device *sdev)
1062 {
1063 sdev->use_10_for_rw = 1;
1064 sdev->use_10_for_ms = 1;
1065 sdev->no_report_opcodes = 1;
1066 sdev->no_write_same = 1;
1067
1068 /* Schedule policy is determined by ->qc_defer() callback and
1069 * it needs to see every deferred qc. Set dev_blocked to 1 to
1070 * prevent SCSI midlayer from automatically deferring
1071 * requests.
1072 */
1073 sdev->max_device_blocked = 1;
1074 }
1075
1076 /**
1077 * atapi_drain_needed - Check whether data transfer may overflow
1078 * @rq: request to be checked
1079 *
1080 * ATAPI commands which transfer variable length data to host
1081 * might overflow due to application error or hardare bug. This
1082 * function checks whether overflow should be drained and ignored
1083 * for @request.
1084 *
1085 * LOCKING:
1086 * None.
1087 *
1088 * RETURNS:
1089 * 1 if ; otherwise, 0.
1090 */
1091 static int atapi_drain_needed(struct request *rq)
1092 {
1093 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
1094 return 0;
1095
1096 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
1097 return 0;
1098
1099 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1100 }
1101
1102 static int ata_scsi_dev_config(struct scsi_device *sdev,
1103 struct ata_device *dev)
1104 {
1105 struct request_queue *q = sdev->request_queue;
1106
1107 if (!ata_id_has_unload(dev->id))
1108 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1109
1110 /* configure max sectors */
1111 blk_queue_max_hw_sectors(q, dev->max_sectors);
1112
1113 if (dev->class == ATA_DEV_ATAPI) {
1114 void *buf;
1115
1116 sdev->sector_size = ATA_SECT_SIZE;
1117
1118 /* set DMA padding */
1119 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
1120
1121 /* configure draining */
1122 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1123 if (!buf) {
1124 ata_dev_err(dev, "drain buffer allocation failed\n");
1125 return -ENOMEM;
1126 }
1127
1128 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1129 } else {
1130 sdev->sector_size = ata_id_logical_sector_size(dev->id);
1131 sdev->manage_start_stop = 1;
1132 }
1133
1134 /*
1135 * ata_pio_sectors() expects buffer for each sector to not cross
1136 * page boundary. Enforce it by requiring buffers to be sector
1137 * aligned, which works iff sector_size is not larger than
1138 * PAGE_SIZE. ATAPI devices also need the alignment as
1139 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1140 */
1141 if (sdev->sector_size > PAGE_SIZE)
1142 ata_dev_warn(dev,
1143 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1144 sdev->sector_size);
1145
1146 blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
1147
1148 if (dev->flags & ATA_DFLAG_AN)
1149 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1150
1151 if (dev->flags & ATA_DFLAG_NCQ) {
1152 int depth;
1153
1154 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1155 depth = min(ATA_MAX_QUEUE - 1, depth);
1156 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
1157 }
1158
1159 blk_queue_flush_queueable(q, false);
1160
1161 dev->sdev = sdev;
1162 return 0;
1163 }
1164
1165 /**
1166 * ata_scsi_slave_config - Set SCSI device attributes
1167 * @sdev: SCSI device to examine
1168 *
1169 * This is called before we actually start reading
1170 * and writing to the device, to configure certain
1171 * SCSI mid-layer behaviors.
1172 *
1173 * LOCKING:
1174 * Defined by SCSI layer. We don't really care.
1175 */
1176
1177 int ata_scsi_slave_config(struct scsi_device *sdev)
1178 {
1179 struct ata_port *ap = ata_shost_to_port(sdev->host);
1180 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1181 int rc = 0;
1182
1183 ata_scsi_sdev_config(sdev);
1184
1185 if (dev)
1186 rc = ata_scsi_dev_config(sdev, dev);
1187
1188 return rc;
1189 }
1190
1191 /**
1192 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1193 * @sdev: SCSI device to be destroyed
1194 *
1195 * @sdev is about to be destroyed for hot/warm unplugging. If
1196 * this unplugging was initiated by libata as indicated by NULL
1197 * dev->sdev, this function doesn't have to do anything.
1198 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1199 * Clear dev->sdev, schedule the device for ATA detach and invoke
1200 * EH.
1201 *
1202 * LOCKING:
1203 * Defined by SCSI layer. We don't really care.
1204 */
1205 void ata_scsi_slave_destroy(struct scsi_device *sdev)
1206 {
1207 struct ata_port *ap = ata_shost_to_port(sdev->host);
1208 struct request_queue *q = sdev->request_queue;
1209 unsigned long flags;
1210 struct ata_device *dev;
1211
1212 if (!ap->ops->error_handler)
1213 return;
1214
1215 spin_lock_irqsave(ap->lock, flags);
1216 dev = __ata_scsi_find_dev(ap, sdev);
1217 if (dev && dev->sdev) {
1218 /* SCSI device already in CANCEL state, no need to offline it */
1219 dev->sdev = NULL;
1220 dev->flags |= ATA_DFLAG_DETACH;
1221 ata_port_schedule_eh(ap);
1222 }
1223 spin_unlock_irqrestore(ap->lock, flags);
1224
1225 kfree(q->dma_drain_buffer);
1226 q->dma_drain_buffer = NULL;
1227 q->dma_drain_size = 0;
1228 }
1229
1230 /**
1231 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
1232 * @ap: ATA port to which the device change the queue depth
1233 * @sdev: SCSI device to configure queue depth for
1234 * @queue_depth: new queue depth
1235 * @reason: calling context
1236 *
1237 * libsas and libata have different approaches for associating a sdev to
1238 * its ata_port.
1239 *
1240 */
1241 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
1242 int queue_depth, int reason)
1243 {
1244 struct ata_device *dev;
1245 unsigned long flags;
1246
1247 if (reason != SCSI_QDEPTH_DEFAULT)
1248 return -EOPNOTSUPP;
1249
1250 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1251 return sdev->queue_depth;
1252
1253 dev = ata_scsi_find_dev(ap, sdev);
1254 if (!dev || !ata_dev_enabled(dev))
1255 return sdev->queue_depth;
1256
1257 /* NCQ enabled? */
1258 spin_lock_irqsave(ap->lock, flags);
1259 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1260 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1261 dev->flags |= ATA_DFLAG_NCQ_OFF;
1262 queue_depth = 1;
1263 }
1264 spin_unlock_irqrestore(ap->lock, flags);
1265
1266 /* limit and apply queue depth */
1267 queue_depth = min(queue_depth, sdev->host->can_queue);
1268 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1269 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1270
1271 if (sdev->queue_depth == queue_depth)
1272 return -EINVAL;
1273
1274 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
1275 return queue_depth;
1276 }
1277
1278 /**
1279 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1280 * @sdev: SCSI device to configure queue depth for
1281 * @queue_depth: new queue depth
1282 * @reason: calling context
1283 *
1284 * This is libata standard hostt->change_queue_depth callback.
1285 * SCSI will call into this callback when user tries to set queue
1286 * depth via sysfs.
1287 *
1288 * LOCKING:
1289 * SCSI layer (we don't care)
1290 *
1291 * RETURNS:
1292 * Newly configured queue depth.
1293 */
1294 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth,
1295 int reason)
1296 {
1297 struct ata_port *ap = ata_shost_to_port(sdev->host);
1298
1299 return __ata_change_queue_depth(ap, sdev, queue_depth, reason);
1300 }
1301
1302 /**
1303 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1304 * @qc: Storage for translated ATA taskfile
1305 *
1306 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1307 * (to start). Perhaps these commands should be preceded by
1308 * CHECK POWER MODE to see what power mode the device is already in.
1309 * [See SAT revision 5 at www.t10.org]
1310 *
1311 * LOCKING:
1312 * spin_lock_irqsave(host lock)
1313 *
1314 * RETURNS:
1315 * Zero on success, non-zero on error.
1316 */
1317 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1318 {
1319 struct scsi_cmnd *scmd = qc->scsicmd;
1320 struct ata_taskfile *tf = &qc->tf;
1321 const u8 *cdb = scmd->cmnd;
1322
1323 if (scmd->cmd_len < 5)
1324 goto invalid_fld;
1325
1326 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1327 tf->protocol = ATA_PROT_NODATA;
1328 if (cdb[1] & 0x1) {
1329 ; /* ignore IMMED bit, violates sat-r05 */
1330 }
1331 if (cdb[4] & 0x2)
1332 goto invalid_fld; /* LOEJ bit set not supported */
1333 if (((cdb[4] >> 4) & 0xf) != 0)
1334 goto invalid_fld; /* power conditions not supported */
1335
1336 if (cdb[4] & 0x1) {
1337 tf->nsect = 1; /* 1 sector, lba=0 */
1338
1339 if (qc->dev->flags & ATA_DFLAG_LBA) {
1340 tf->flags |= ATA_TFLAG_LBA;
1341
1342 tf->lbah = 0x0;
1343 tf->lbam = 0x0;
1344 tf->lbal = 0x0;
1345 tf->device |= ATA_LBA;
1346 } else {
1347 /* CHS */
1348 tf->lbal = 0x1; /* sect */
1349 tf->lbam = 0x0; /* cyl low */
1350 tf->lbah = 0x0; /* cyl high */
1351 }
1352
1353 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
1354 } else {
1355 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1356 * or S5) causing some drives to spin up and down again.
1357 */
1358 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1359 system_state == SYSTEM_POWER_OFF)
1360 goto skip;
1361
1362 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1363 system_entering_hibernation())
1364 goto skip;
1365
1366 /* Issue ATA STANDBY IMMEDIATE command */
1367 tf->command = ATA_CMD_STANDBYNOW1;
1368 }
1369
1370 /*
1371 * Standby and Idle condition timers could be implemented but that
1372 * would require libata to implement the Power condition mode page
1373 * and allow the user to change it. Changing mode pages requires
1374 * MODE SELECT to be implemented.
1375 */
1376
1377 return 0;
1378
1379 invalid_fld:
1380 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1381 /* "Invalid field in cbd" */
1382 return 1;
1383 skip:
1384 scmd->result = SAM_STAT_GOOD;
1385 return 1;
1386 }
1387
1388
1389 /**
1390 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1391 * @qc: Storage for translated ATA taskfile
1392 *
1393 * Sets up an ATA taskfile to issue FLUSH CACHE or
1394 * FLUSH CACHE EXT.
1395 *
1396 * LOCKING:
1397 * spin_lock_irqsave(host lock)
1398 *
1399 * RETURNS:
1400 * Zero on success, non-zero on error.
1401 */
1402 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1403 {
1404 struct ata_taskfile *tf = &qc->tf;
1405
1406 tf->flags |= ATA_TFLAG_DEVICE;
1407 tf->protocol = ATA_PROT_NODATA;
1408
1409 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1410 tf->command = ATA_CMD_FLUSH_EXT;
1411 else
1412 tf->command = ATA_CMD_FLUSH;
1413
1414 /* flush is critical for IO integrity, consider it an IO command */
1415 qc->flags |= ATA_QCFLAG_IO;
1416
1417 return 0;
1418 }
1419
1420 /**
1421 * scsi_6_lba_len - Get LBA and transfer length
1422 * @cdb: SCSI command to translate
1423 *
1424 * Calculate LBA and transfer length for 6-byte commands.
1425 *
1426 * RETURNS:
1427 * @plba: the LBA
1428 * @plen: the transfer length
1429 */
1430 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1431 {
1432 u64 lba = 0;
1433 u32 len;
1434
1435 VPRINTK("six-byte command\n");
1436
1437 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1438 lba |= ((u64)cdb[2]) << 8;
1439 lba |= ((u64)cdb[3]);
1440
1441 len = cdb[4];
1442
1443 *plba = lba;
1444 *plen = len;
1445 }
1446
1447 /**
1448 * scsi_10_lba_len - Get LBA and transfer length
1449 * @cdb: SCSI command to translate
1450 *
1451 * Calculate LBA and transfer length for 10-byte commands.
1452 *
1453 * RETURNS:
1454 * @plba: the LBA
1455 * @plen: the transfer length
1456 */
1457 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1458 {
1459 u64 lba = 0;
1460 u32 len = 0;
1461
1462 VPRINTK("ten-byte command\n");
1463
1464 lba |= ((u64)cdb[2]) << 24;
1465 lba |= ((u64)cdb[3]) << 16;
1466 lba |= ((u64)cdb[4]) << 8;
1467 lba |= ((u64)cdb[5]);
1468
1469 len |= ((u32)cdb[7]) << 8;
1470 len |= ((u32)cdb[8]);
1471
1472 *plba = lba;
1473 *plen = len;
1474 }
1475
1476 /**
1477 * scsi_16_lba_len - Get LBA and transfer length
1478 * @cdb: SCSI command to translate
1479 *
1480 * Calculate LBA and transfer length for 16-byte commands.
1481 *
1482 * RETURNS:
1483 * @plba: the LBA
1484 * @plen: the transfer length
1485 */
1486 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1487 {
1488 u64 lba = 0;
1489 u32 len = 0;
1490
1491 VPRINTK("sixteen-byte command\n");
1492
1493 lba |= ((u64)cdb[2]) << 56;
1494 lba |= ((u64)cdb[3]) << 48;
1495 lba |= ((u64)cdb[4]) << 40;
1496 lba |= ((u64)cdb[5]) << 32;
1497 lba |= ((u64)cdb[6]) << 24;
1498 lba |= ((u64)cdb[7]) << 16;
1499 lba |= ((u64)cdb[8]) << 8;
1500 lba |= ((u64)cdb[9]);
1501
1502 len |= ((u32)cdb[10]) << 24;
1503 len |= ((u32)cdb[11]) << 16;
1504 len |= ((u32)cdb[12]) << 8;
1505 len |= ((u32)cdb[13]);
1506
1507 *plba = lba;
1508 *plen = len;
1509 }
1510
1511 /**
1512 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1513 * @qc: Storage for translated ATA taskfile
1514 *
1515 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1516 *
1517 * LOCKING:
1518 * spin_lock_irqsave(host lock)
1519 *
1520 * RETURNS:
1521 * Zero on success, non-zero on error.
1522 */
1523 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1524 {
1525 struct scsi_cmnd *scmd = qc->scsicmd;
1526 struct ata_taskfile *tf = &qc->tf;
1527 struct ata_device *dev = qc->dev;
1528 u64 dev_sectors = qc->dev->n_sectors;
1529 const u8 *cdb = scmd->cmnd;
1530 u64 block;
1531 u32 n_block;
1532
1533 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1534 tf->protocol = ATA_PROT_NODATA;
1535
1536 if (cdb[0] == VERIFY) {
1537 if (scmd->cmd_len < 10)
1538 goto invalid_fld;
1539 scsi_10_lba_len(cdb, &block, &n_block);
1540 } else if (cdb[0] == VERIFY_16) {
1541 if (scmd->cmd_len < 16)
1542 goto invalid_fld;
1543 scsi_16_lba_len(cdb, &block, &n_block);
1544 } else
1545 goto invalid_fld;
1546
1547 if (!n_block)
1548 goto nothing_to_do;
1549 if (block >= dev_sectors)
1550 goto out_of_range;
1551 if ((block + n_block) > dev_sectors)
1552 goto out_of_range;
1553
1554 if (dev->flags & ATA_DFLAG_LBA) {
1555 tf->flags |= ATA_TFLAG_LBA;
1556
1557 if (lba_28_ok(block, n_block)) {
1558 /* use LBA28 */
1559 tf->command = ATA_CMD_VERIFY;
1560 tf->device |= (block >> 24) & 0xf;
1561 } else if (lba_48_ok(block, n_block)) {
1562 if (!(dev->flags & ATA_DFLAG_LBA48))
1563 goto out_of_range;
1564
1565 /* use LBA48 */
1566 tf->flags |= ATA_TFLAG_LBA48;
1567 tf->command = ATA_CMD_VERIFY_EXT;
1568
1569 tf->hob_nsect = (n_block >> 8) & 0xff;
1570
1571 tf->hob_lbah = (block >> 40) & 0xff;
1572 tf->hob_lbam = (block >> 32) & 0xff;
1573 tf->hob_lbal = (block >> 24) & 0xff;
1574 } else
1575 /* request too large even for LBA48 */
1576 goto out_of_range;
1577
1578 tf->nsect = n_block & 0xff;
1579
1580 tf->lbah = (block >> 16) & 0xff;
1581 tf->lbam = (block >> 8) & 0xff;
1582 tf->lbal = block & 0xff;
1583
1584 tf->device |= ATA_LBA;
1585 } else {
1586 /* CHS */
1587 u32 sect, head, cyl, track;
1588
1589 if (!lba_28_ok(block, n_block))
1590 goto out_of_range;
1591
1592 /* Convert LBA to CHS */
1593 track = (u32)block / dev->sectors;
1594 cyl = track / dev->heads;
1595 head = track % dev->heads;
1596 sect = (u32)block % dev->sectors + 1;
1597
1598 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1599 (u32)block, track, cyl, head, sect);
1600
1601 /* Check whether the converted CHS can fit.
1602 Cylinder: 0-65535
1603 Head: 0-15
1604 Sector: 1-255*/
1605 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1606 goto out_of_range;
1607
1608 tf->command = ATA_CMD_VERIFY;
1609 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1610 tf->lbal = sect;
1611 tf->lbam = cyl;
1612 tf->lbah = cyl >> 8;
1613 tf->device |= head;
1614 }
1615
1616 return 0;
1617
1618 invalid_fld:
1619 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1620 /* "Invalid field in cbd" */
1621 return 1;
1622
1623 out_of_range:
1624 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1625 /* "Logical Block Address out of range" */
1626 return 1;
1627
1628 nothing_to_do:
1629 scmd->result = SAM_STAT_GOOD;
1630 return 1;
1631 }
1632
1633 /**
1634 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1635 * @qc: Storage for translated ATA taskfile
1636 *
1637 * Converts any of six SCSI read/write commands into the
1638 * ATA counterpart, including starting sector (LBA),
1639 * sector count, and taking into account the device's LBA48
1640 * support.
1641 *
1642 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1643 * %WRITE_16 are currently supported.
1644 *
1645 * LOCKING:
1646 * spin_lock_irqsave(host lock)
1647 *
1648 * RETURNS:
1649 * Zero on success, non-zero on error.
1650 */
1651 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1652 {
1653 struct scsi_cmnd *scmd = qc->scsicmd;
1654 const u8 *cdb = scmd->cmnd;
1655 unsigned int tf_flags = 0;
1656 u64 block;
1657 u32 n_block;
1658 int rc;
1659
1660 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1661 tf_flags |= ATA_TFLAG_WRITE;
1662
1663 /* Calculate the SCSI LBA, transfer length and FUA. */
1664 switch (cdb[0]) {
1665 case READ_10:
1666 case WRITE_10:
1667 if (unlikely(scmd->cmd_len < 10))
1668 goto invalid_fld;
1669 scsi_10_lba_len(cdb, &block, &n_block);
1670 if (cdb[1] & (1 << 3))
1671 tf_flags |= ATA_TFLAG_FUA;
1672 break;
1673 case READ_6:
1674 case WRITE_6:
1675 if (unlikely(scmd->cmd_len < 6))
1676 goto invalid_fld;
1677 scsi_6_lba_len(cdb, &block, &n_block);
1678
1679 /* for 6-byte r/w commands, transfer length 0
1680 * means 256 blocks of data, not 0 block.
1681 */
1682 if (!n_block)
1683 n_block = 256;
1684 break;
1685 case READ_16:
1686 case WRITE_16:
1687 if (unlikely(scmd->cmd_len < 16))
1688 goto invalid_fld;
1689 scsi_16_lba_len(cdb, &block, &n_block);
1690 if (cdb[1] & (1 << 3))
1691 tf_flags |= ATA_TFLAG_FUA;
1692 break;
1693 default:
1694 DPRINTK("no-byte command\n");
1695 goto invalid_fld;
1696 }
1697
1698 /* Check and compose ATA command */
1699 if (!n_block)
1700 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1701 * length 0 means transfer 0 block of data.
1702 * However, for ATA R/W commands, sector count 0 means
1703 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1704 *
1705 * WARNING: one or two older ATA drives treat 0 as 0...
1706 */
1707 goto nothing_to_do;
1708
1709 qc->flags |= ATA_QCFLAG_IO;
1710 qc->nbytes = n_block * scmd->device->sector_size;
1711
1712 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1713 qc->tag);
1714 if (likely(rc == 0))
1715 return 0;
1716
1717 if (rc == -ERANGE)
1718 goto out_of_range;
1719 /* treat all other errors as -EINVAL, fall through */
1720 invalid_fld:
1721 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1722 /* "Invalid field in cbd" */
1723 return 1;
1724
1725 out_of_range:
1726 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1727 /* "Logical Block Address out of range" */
1728 return 1;
1729
1730 nothing_to_do:
1731 scmd->result = SAM_STAT_GOOD;
1732 return 1;
1733 }
1734
1735 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1736 {
1737 struct ata_port *ap = qc->ap;
1738 struct scsi_cmnd *cmd = qc->scsicmd;
1739 u8 *cdb = cmd->cmnd;
1740 int need_sense = (qc->err_mask != 0);
1741
1742 /* For ATA pass thru (SAT) commands, generate a sense block if
1743 * user mandated it or if there's an error. Note that if we
1744 * generate because the user forced us to [CK_COND =1], a check
1745 * condition is generated and the ATA register values are returned
1746 * whether the command completed successfully or not. If there
1747 * was no error, we use the following sense data:
1748 * sk = RECOVERED ERROR
1749 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
1750 */
1751 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1752 ((cdb[2] & 0x20) || need_sense)) {
1753 ata_gen_passthru_sense(qc);
1754 } else {
1755 if (!need_sense) {
1756 cmd->result = SAM_STAT_GOOD;
1757 } else {
1758 /* TODO: decide which descriptor format to use
1759 * for 48b LBA devices and call that here
1760 * instead of the fixed desc, which is only
1761 * good for smaller LBA (and maybe CHS?)
1762 * devices.
1763 */
1764 ata_gen_ata_sense(qc);
1765 }
1766 }
1767
1768 if (need_sense && !ap->ops->error_handler)
1769 ata_dump_status(ap->print_id, &qc->result_tf);
1770
1771 qc->scsidone(cmd);
1772
1773 ata_qc_free(qc);
1774 }
1775
1776 /**
1777 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1778 * @dev: ATA device to which the command is addressed
1779 * @cmd: SCSI command to execute
1780 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1781 *
1782 * Our ->queuecommand() function has decided that the SCSI
1783 * command issued can be directly translated into an ATA
1784 * command, rather than handled internally.
1785 *
1786 * This function sets up an ata_queued_cmd structure for the
1787 * SCSI command, and sends that ata_queued_cmd to the hardware.
1788 *
1789 * The xlat_func argument (actor) returns 0 if ready to execute
1790 * ATA command, else 1 to finish translation. If 1 is returned
1791 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1792 * to be set reflecting an error condition or clean (early)
1793 * termination.
1794 *
1795 * LOCKING:
1796 * spin_lock_irqsave(host lock)
1797 *
1798 * RETURNS:
1799 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1800 * needs to be deferred.
1801 */
1802 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1803 ata_xlat_func_t xlat_func)
1804 {
1805 struct ata_port *ap = dev->link->ap;
1806 struct ata_queued_cmd *qc;
1807 int rc;
1808
1809 VPRINTK("ENTER\n");
1810
1811 qc = ata_scsi_qc_new(dev, cmd);
1812 if (!qc)
1813 goto err_mem;
1814
1815 /* data is present; dma-map it */
1816 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1817 cmd->sc_data_direction == DMA_TO_DEVICE) {
1818 if (unlikely(scsi_bufflen(cmd) < 1)) {
1819 ata_dev_warn(dev, "WARNING: zero len r/w req\n");
1820 goto err_did;
1821 }
1822
1823 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1824
1825 qc->dma_dir = cmd->sc_data_direction;
1826 }
1827
1828 qc->complete_fn = ata_scsi_qc_complete;
1829
1830 if (xlat_func(qc))
1831 goto early_finish;
1832
1833 if (ap->ops->qc_defer) {
1834 if ((rc = ap->ops->qc_defer(qc)))
1835 goto defer;
1836 }
1837
1838 /* select device, send command to hardware */
1839 ata_qc_issue(qc);
1840
1841 VPRINTK("EXIT\n");
1842 return 0;
1843
1844 early_finish:
1845 ata_qc_free(qc);
1846 cmd->scsi_done(cmd);
1847 DPRINTK("EXIT - early finish (good or error)\n");
1848 return 0;
1849
1850 err_did:
1851 ata_qc_free(qc);
1852 cmd->result = (DID_ERROR << 16);
1853 cmd->scsi_done(cmd);
1854 err_mem:
1855 DPRINTK("EXIT - internal\n");
1856 return 0;
1857
1858 defer:
1859 ata_qc_free(qc);
1860 DPRINTK("EXIT - defer\n");
1861 if (rc == ATA_DEFER_LINK)
1862 return SCSI_MLQUEUE_DEVICE_BUSY;
1863 else
1864 return SCSI_MLQUEUE_HOST_BUSY;
1865 }
1866
1867 /**
1868 * ata_scsi_rbuf_get - Map response buffer.
1869 * @cmd: SCSI command containing buffer to be mapped.
1870 * @flags: unsigned long variable to store irq enable status
1871 * @copy_in: copy in from user buffer
1872 *
1873 * Prepare buffer for simulated SCSI commands.
1874 *
1875 * LOCKING:
1876 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1877 *
1878 * RETURNS:
1879 * Pointer to response buffer.
1880 */
1881 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1882 unsigned long *flags)
1883 {
1884 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1885
1886 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1887 if (copy_in)
1888 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1889 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1890 return ata_scsi_rbuf;
1891 }
1892
1893 /**
1894 * ata_scsi_rbuf_put - Unmap response buffer.
1895 * @cmd: SCSI command containing buffer to be unmapped.
1896 * @copy_out: copy out result
1897 * @flags: @flags passed to ata_scsi_rbuf_get()
1898 *
1899 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1900 * @copy_back is true.
1901 *
1902 * LOCKING:
1903 * Unlocks ata_scsi_rbuf_lock.
1904 */
1905 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1906 unsigned long *flags)
1907 {
1908 if (copy_out)
1909 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1910 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1911 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1912 }
1913
1914 /**
1915 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1916 * @args: device IDENTIFY data / SCSI command of interest.
1917 * @actor: Callback hook for desired SCSI command simulator
1918 *
1919 * Takes care of the hard work of simulating a SCSI command...
1920 * Mapping the response buffer, calling the command's handler,
1921 * and handling the handler's return value. This return value
1922 * indicates whether the handler wishes the SCSI command to be
1923 * completed successfully (0), or not (in which case cmd->result
1924 * and sense buffer are assumed to be set).
1925 *
1926 * LOCKING:
1927 * spin_lock_irqsave(host lock)
1928 */
1929 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1930 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1931 {
1932 u8 *rbuf;
1933 unsigned int rc;
1934 struct scsi_cmnd *cmd = args->cmd;
1935 unsigned long flags;
1936
1937 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1938 rc = actor(args, rbuf);
1939 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
1940
1941 if (rc == 0)
1942 cmd->result = SAM_STAT_GOOD;
1943 args->done(cmd);
1944 }
1945
1946 /**
1947 * ata_scsiop_inq_std - Simulate INQUIRY command
1948 * @args: device IDENTIFY data / SCSI command of interest.
1949 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1950 *
1951 * Returns standard device identification data associated
1952 * with non-VPD INQUIRY command output.
1953 *
1954 * LOCKING:
1955 * spin_lock_irqsave(host lock)
1956 */
1957 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1958 {
1959 const u8 versions[] = {
1960 0x60, /* SAM-3 (no version claimed) */
1961
1962 0x03,
1963 0x20, /* SBC-2 (no version claimed) */
1964
1965 0x02,
1966 0x60 /* SPC-3 (no version claimed) */
1967 };
1968 u8 hdr[] = {
1969 TYPE_DISK,
1970 0,
1971 0x5, /* claim SPC-3 version compatibility */
1972 2,
1973 95 - 4
1974 };
1975
1976 VPRINTK("ENTER\n");
1977
1978 /* set scsi removeable (RMB) bit per ata bit */
1979 if (ata_id_removeable(args->id))
1980 hdr[1] |= (1 << 7);
1981
1982 memcpy(rbuf, hdr, sizeof(hdr));
1983 memcpy(&rbuf[8], "ATA ", 8);
1984 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1985 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1986
1987 if (rbuf[32] == 0 || rbuf[32] == ' ')
1988 memcpy(&rbuf[32], "n/a ", 4);
1989
1990 memcpy(rbuf + 59, versions, sizeof(versions));
1991
1992 return 0;
1993 }
1994
1995 /**
1996 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1997 * @args: device IDENTIFY data / SCSI command of interest.
1998 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1999 *
2000 * Returns list of inquiry VPD pages available.
2001 *
2002 * LOCKING:
2003 * spin_lock_irqsave(host lock)
2004 */
2005 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
2006 {
2007 const u8 pages[] = {
2008 0x00, /* page 0x00, this page */
2009 0x80, /* page 0x80, unit serial no page */
2010 0x83, /* page 0x83, device ident page */
2011 0x89, /* page 0x89, ata info page */
2012 0xb0, /* page 0xb0, block limits page */
2013 0xb1, /* page 0xb1, block device characteristics page */
2014 0xb2, /* page 0xb2, thin provisioning page */
2015 };
2016
2017 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
2018 memcpy(rbuf + 4, pages, sizeof(pages));
2019 return 0;
2020 }
2021
2022 /**
2023 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
2024 * @args: device IDENTIFY data / SCSI command of interest.
2025 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2026 *
2027 * Returns ATA device serial number.
2028 *
2029 * LOCKING:
2030 * spin_lock_irqsave(host lock)
2031 */
2032 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
2033 {
2034 const u8 hdr[] = {
2035 0,
2036 0x80, /* this page code */
2037 0,
2038 ATA_ID_SERNO_LEN, /* page len */
2039 };
2040
2041 memcpy(rbuf, hdr, sizeof(hdr));
2042 ata_id_string(args->id, (unsigned char *) &rbuf[4],
2043 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2044 return 0;
2045 }
2046
2047 /**
2048 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2049 * @args: device IDENTIFY data / SCSI command of interest.
2050 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2051 *
2052 * Yields two logical unit device identification designators:
2053 * - vendor specific ASCII containing the ATA serial number
2054 * - SAT defined "t10 vendor id based" containing ASCII vendor
2055 * name ("ATA "), model and serial numbers.
2056 *
2057 * LOCKING:
2058 * spin_lock_irqsave(host lock)
2059 */
2060 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
2061 {
2062 const int sat_model_serial_desc_len = 68;
2063 int num;
2064
2065 rbuf[1] = 0x83; /* this page code */
2066 num = 4;
2067
2068 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2069 rbuf[num + 0] = 2;
2070 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2071 num += 4;
2072 ata_id_string(args->id, (unsigned char *) rbuf + num,
2073 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2074 num += ATA_ID_SERNO_LEN;
2075
2076 /* SAT defined lu model and serial numbers descriptor */
2077 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2078 rbuf[num + 0] = 2;
2079 rbuf[num + 1] = 1;
2080 rbuf[num + 3] = sat_model_serial_desc_len;
2081 num += 4;
2082 memcpy(rbuf + num, "ATA ", 8);
2083 num += 8;
2084 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2085 ATA_ID_PROD_LEN);
2086 num += ATA_ID_PROD_LEN;
2087 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2088 ATA_ID_SERNO_LEN);
2089 num += ATA_ID_SERNO_LEN;
2090
2091 if (ata_id_has_wwn(args->id)) {
2092 /* SAT defined lu world wide name */
2093 /* piv=0, assoc=lu, code_set=binary, designator=NAA */
2094 rbuf[num + 0] = 1;
2095 rbuf[num + 1] = 3;
2096 rbuf[num + 3] = ATA_ID_WWN_LEN;
2097 num += 4;
2098 ata_id_string(args->id, (unsigned char *) rbuf + num,
2099 ATA_ID_WWN, ATA_ID_WWN_LEN);
2100 num += ATA_ID_WWN_LEN;
2101 }
2102 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
2103 return 0;
2104 }
2105
2106 /**
2107 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2108 * @args: device IDENTIFY data / SCSI command of interest.
2109 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2110 *
2111 * Yields SAT-specified ATA VPD page.
2112 *
2113 * LOCKING:
2114 * spin_lock_irqsave(host lock)
2115 */
2116 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
2117 {
2118 struct ata_taskfile tf;
2119
2120 memset(&tf, 0, sizeof(tf));
2121
2122 rbuf[1] = 0x89; /* our page code */
2123 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2124 rbuf[3] = (0x238 & 0xff);
2125
2126 memcpy(&rbuf[8], "linux ", 8);
2127 memcpy(&rbuf[16], "libata ", 16);
2128 memcpy(&rbuf[32], DRV_VERSION, 4);
2129 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
2130
2131 /* we don't store the ATA device signature, so we fake it */
2132
2133 tf.command = ATA_DRDY; /* really, this is Status reg */
2134 tf.lbal = 0x1;
2135 tf.nsect = 0x1;
2136
2137 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2138 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
2139
2140 rbuf[56] = ATA_CMD_ID_ATA;
2141
2142 memcpy(&rbuf[60], &args->id[0], 512);
2143 return 0;
2144 }
2145
2146 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
2147 {
2148 u16 min_io_sectors;
2149
2150 rbuf[1] = 0xb0;
2151 rbuf[3] = 0x3c; /* required VPD size with unmap support */
2152
2153 /*
2154 * Optimal transfer length granularity.
2155 *
2156 * This is always one physical block, but for disks with a smaller
2157 * logical than physical sector size we need to figure out what the
2158 * latter is.
2159 */
2160 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
2161 put_unaligned_be16(min_io_sectors, &rbuf[6]);
2162
2163 /*
2164 * Optimal unmap granularity.
2165 *
2166 * The ATA spec doesn't even know about a granularity or alignment
2167 * for the TRIM command. We can leave away most of the unmap related
2168 * VPD page entries, but we have specifify a granularity to signal
2169 * that we support some form of unmap - in thise case via WRITE SAME
2170 * with the unmap bit set.
2171 */
2172 if (ata_id_has_trim(args->id)) {
2173 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
2174 put_unaligned_be32(1, &rbuf[28]);
2175 }
2176
2177 return 0;
2178 }
2179
2180 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2181 {
2182 int form_factor = ata_id_form_factor(args->id);
2183 int media_rotation_rate = ata_id_rotation_rate(args->id);
2184
2185 rbuf[1] = 0xb1;
2186 rbuf[3] = 0x3c;
2187 rbuf[4] = media_rotation_rate >> 8;
2188 rbuf[5] = media_rotation_rate;
2189 rbuf[7] = form_factor;
2190
2191 return 0;
2192 }
2193
2194 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
2195 {
2196 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2197 rbuf[1] = 0xb2;
2198 rbuf[3] = 0x4;
2199 rbuf[5] = 1 << 6; /* TPWS */
2200
2201 return 0;
2202 }
2203
2204 /**
2205 * ata_scsiop_noop - Command handler that simply returns success.
2206 * @args: device IDENTIFY data / SCSI command of interest.
2207 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2208 *
2209 * No operation. Simply returns success to caller, to indicate
2210 * that the caller should successfully complete this SCSI command.
2211 *
2212 * LOCKING:
2213 * spin_lock_irqsave(host lock)
2214 */
2215 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
2216 {
2217 VPRINTK("ENTER\n");
2218 return 0;
2219 }
2220
2221 /**
2222 * modecpy - Prepare response for MODE SENSE
2223 * @dest: output buffer
2224 * @src: data being copied
2225 * @n: length of mode page
2226 * @changeable: whether changeable parameters are requested
2227 *
2228 * Generate a generic MODE SENSE page for either current or changeable
2229 * parameters.
2230 *
2231 * LOCKING:
2232 * None.
2233 */
2234 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
2235 {
2236 if (changeable) {
2237 memcpy(dest, src, 2);
2238 memset(dest + 2, 0, n - 2);
2239 } else {
2240 memcpy(dest, src, n);
2241 }
2242 }
2243
2244 /**
2245 * ata_msense_caching - Simulate MODE SENSE caching info page
2246 * @id: device IDENTIFY data
2247 * @buf: output buffer
2248 * @changeable: whether changeable parameters are requested
2249 *
2250 * Generate a caching info page, which conditionally indicates
2251 * write caching to the SCSI layer, depending on device
2252 * capabilities.
2253 *
2254 * LOCKING:
2255 * None.
2256 */
2257 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
2258 {
2259 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
2260 if (changeable || ata_id_wcache_enabled(id))
2261 buf[2] |= (1 << 2); /* write cache enable */
2262 if (!changeable && !ata_id_rahead_enabled(id))
2263 buf[12] |= (1 << 5); /* disable read ahead */
2264 return sizeof(def_cache_mpage);
2265 }
2266
2267 /**
2268 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2269 * @buf: output buffer
2270 * @changeable: whether changeable parameters are requested
2271 *
2272 * Generate a generic MODE SENSE control mode page.
2273 *
2274 * LOCKING:
2275 * None.
2276 */
2277 static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable)
2278 {
2279 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable);
2280 return sizeof(def_control_mpage);
2281 }
2282
2283 /**
2284 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2285 * @buf: output buffer
2286 * @changeable: whether changeable parameters are requested
2287 *
2288 * Generate a generic MODE SENSE r/w error recovery page.
2289 *
2290 * LOCKING:
2291 * None.
2292 */
2293 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable)
2294 {
2295 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage),
2296 changeable);
2297 return sizeof(def_rw_recovery_mpage);
2298 }
2299
2300 /*
2301 * We can turn this into a real blacklist if it's needed, for now just
2302 * blacklist any Maxtor BANC1G10 revision firmware
2303 */
2304 static int ata_dev_supports_fua(u16 *id)
2305 {
2306 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2307
2308 if (!libata_fua)
2309 return 0;
2310 if (!ata_id_has_fua(id))
2311 return 0;
2312
2313 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2314 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2315
2316 if (strcmp(model, "Maxtor"))
2317 return 1;
2318 if (strcmp(fw, "BANC1G10"))
2319 return 1;
2320
2321 return 0; /* blacklisted */
2322 }
2323
2324 /**
2325 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2326 * @args: device IDENTIFY data / SCSI command of interest.
2327 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2328 *
2329 * Simulate MODE SENSE commands. Assume this is invoked for direct
2330 * access devices (e.g. disks) only. There should be no block
2331 * descriptor for other device types.
2332 *
2333 * LOCKING:
2334 * spin_lock_irqsave(host lock)
2335 */
2336 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
2337 {
2338 struct ata_device *dev = args->dev;
2339 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
2340 const u8 sat_blk_desc[] = {
2341 0, 0, 0, 0, /* number of blocks: sat unspecified */
2342 0,
2343 0, 0x2, 0x0 /* block length: 512 bytes */
2344 };
2345 u8 pg, spg;
2346 unsigned int ebd, page_control, six_byte;
2347 u8 dpofua;
2348
2349 VPRINTK("ENTER\n");
2350
2351 six_byte = (scsicmd[0] == MODE_SENSE);
2352 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2353 /*
2354 * LLBA bit in msense(10) ignored (compliant)
2355 */
2356
2357 page_control = scsicmd[2] >> 6;
2358 switch (page_control) {
2359 case 0: /* current */
2360 case 1: /* changeable */
2361 case 2: /* defaults */
2362 break; /* supported */
2363 case 3: /* saved */
2364 goto saving_not_supp;
2365 default:
2366 goto invalid_fld;
2367 }
2368
2369 if (six_byte)
2370 p += 4 + (ebd ? 8 : 0);
2371 else
2372 p += 8 + (ebd ? 8 : 0);
2373
2374 pg = scsicmd[2] & 0x3f;
2375 spg = scsicmd[3];
2376 /*
2377 * No mode subpages supported (yet) but asking for _all_
2378 * subpages may be valid
2379 */
2380 if (spg && (spg != ALL_SUB_MPAGES))
2381 goto invalid_fld;
2382
2383 switch(pg) {
2384 case RW_RECOVERY_MPAGE:
2385 p += ata_msense_rw_recovery(p, page_control == 1);
2386 break;
2387
2388 case CACHE_MPAGE:
2389 p += ata_msense_caching(args->id, p, page_control == 1);
2390 break;
2391
2392 case CONTROL_MPAGE:
2393 p += ata_msense_ctl_mode(p, page_control == 1);
2394 break;
2395
2396 case ALL_MPAGES:
2397 p += ata_msense_rw_recovery(p, page_control == 1);
2398 p += ata_msense_caching(args->id, p, page_control == 1);
2399 p += ata_msense_ctl_mode(p, page_control == 1);
2400 break;
2401
2402 default: /* invalid page code */
2403 goto invalid_fld;
2404 }
2405
2406 dpofua = 0;
2407 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2408 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2409 dpofua = 1 << 4;
2410
2411 if (six_byte) {
2412 rbuf[0] = p - rbuf - 1;
2413 rbuf[2] |= dpofua;
2414 if (ebd) {
2415 rbuf[3] = sizeof(sat_blk_desc);
2416 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2417 }
2418 } else {
2419 unsigned int output_len = p - rbuf - 2;
2420
2421 rbuf[0] = output_len >> 8;
2422 rbuf[1] = output_len;
2423 rbuf[3] |= dpofua;
2424 if (ebd) {
2425 rbuf[7] = sizeof(sat_blk_desc);
2426 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2427 }
2428 }
2429 return 0;
2430
2431 invalid_fld:
2432 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2433 /* "Invalid field in cbd" */
2434 return 1;
2435
2436 saving_not_supp:
2437 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2438 /* "Saving parameters not supported" */
2439 return 1;
2440 }
2441
2442 /**
2443 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2444 * @args: device IDENTIFY data / SCSI command of interest.
2445 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2446 *
2447 * Simulate READ CAPACITY commands.
2448 *
2449 * LOCKING:
2450 * None.
2451 */
2452 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
2453 {
2454 struct ata_device *dev = args->dev;
2455 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
2456 u32 sector_size; /* physical sector size in bytes */
2457 u8 log2_per_phys;
2458 u16 lowest_aligned;
2459
2460 sector_size = ata_id_logical_sector_size(dev->id);
2461 log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2462 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
2463
2464 VPRINTK("ENTER\n");
2465
2466 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2467 if (last_lba >= 0xffffffffULL)
2468 last_lba = 0xffffffff;
2469
2470 /* sector count, 32-bit */
2471 rbuf[0] = last_lba >> (8 * 3);
2472 rbuf[1] = last_lba >> (8 * 2);
2473 rbuf[2] = last_lba >> (8 * 1);
2474 rbuf[3] = last_lba;
2475
2476 /* sector size */
2477 rbuf[4] = sector_size >> (8 * 3);
2478 rbuf[5] = sector_size >> (8 * 2);
2479 rbuf[6] = sector_size >> (8 * 1);
2480 rbuf[7] = sector_size;
2481 } else {
2482 /* sector count, 64-bit */
2483 rbuf[0] = last_lba >> (8 * 7);
2484 rbuf[1] = last_lba >> (8 * 6);
2485 rbuf[2] = last_lba >> (8 * 5);
2486 rbuf[3] = last_lba >> (8 * 4);
2487 rbuf[4] = last_lba >> (8 * 3);
2488 rbuf[5] = last_lba >> (8 * 2);
2489 rbuf[6] = last_lba >> (8 * 1);
2490 rbuf[7] = last_lba;
2491
2492 /* sector size */
2493 rbuf[ 8] = sector_size >> (8 * 3);
2494 rbuf[ 9] = sector_size >> (8 * 2);
2495 rbuf[10] = sector_size >> (8 * 1);
2496 rbuf[11] = sector_size;
2497
2498 rbuf[12] = 0;
2499 rbuf[13] = log2_per_phys;
2500 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2501 rbuf[15] = lowest_aligned;
2502
2503 if (ata_id_has_trim(args->id)) {
2504 rbuf[14] |= 0x80; /* TPE */
2505
2506 if (ata_id_has_zero_after_trim(args->id))
2507 rbuf[14] |= 0x40; /* TPRZ */
2508 }
2509 }
2510
2511 return 0;
2512 }
2513
2514 /**
2515 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2516 * @args: device IDENTIFY data / SCSI command of interest.
2517 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2518 *
2519 * Simulate REPORT LUNS command.
2520 *
2521 * LOCKING:
2522 * spin_lock_irqsave(host lock)
2523 */
2524 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
2525 {
2526 VPRINTK("ENTER\n");
2527 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2528
2529 return 0;
2530 }
2531
2532 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2533 {
2534 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2535 /* FIXME: not quite right; we don't want the
2536 * translation of taskfile registers into
2537 * a sense descriptors, since that's only
2538 * correct for ATA, not ATAPI
2539 */
2540 ata_gen_passthru_sense(qc);
2541 }
2542
2543 qc->scsidone(qc->scsicmd);
2544 ata_qc_free(qc);
2545 }
2546
2547 /* is it pointless to prefer PIO for "safety reasons"? */
2548 static inline int ata_pio_use_silly(struct ata_port *ap)
2549 {
2550 return (ap->flags & ATA_FLAG_PIO_DMA);
2551 }
2552
2553 static void atapi_request_sense(struct ata_queued_cmd *qc)
2554 {
2555 struct ata_port *ap = qc->ap;
2556 struct scsi_cmnd *cmd = qc->scsicmd;
2557
2558 DPRINTK("ATAPI request sense\n");
2559
2560 /* FIXME: is this needed? */
2561 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2562
2563 #ifdef CONFIG_ATA_SFF
2564 if (ap->ops->sff_tf_read)
2565 ap->ops->sff_tf_read(ap, &qc->tf);
2566 #endif
2567
2568 /* fill these in, for the case where they are -not- overwritten */
2569 cmd->sense_buffer[0] = 0x70;
2570 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2571
2572 ata_qc_reinit(qc);
2573
2574 /* setup sg table and init transfer direction */
2575 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2576 ata_sg_init(qc, &qc->sgent, 1);
2577 qc->dma_dir = DMA_FROM_DEVICE;
2578
2579 memset(&qc->cdb, 0, qc->dev->cdb_len);
2580 qc->cdb[0] = REQUEST_SENSE;
2581 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2582
2583 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2584 qc->tf.command = ATA_CMD_PACKET;
2585
2586 if (ata_pio_use_silly(ap)) {
2587 qc->tf.protocol = ATAPI_PROT_DMA;
2588 qc->tf.feature |= ATAPI_PKT_DMA;
2589 } else {
2590 qc->tf.protocol = ATAPI_PROT_PIO;
2591 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2592 qc->tf.lbah = 0;
2593 }
2594 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2595
2596 qc->complete_fn = atapi_sense_complete;
2597
2598 ata_qc_issue(qc);
2599
2600 DPRINTK("EXIT\n");
2601 }
2602
2603 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2604 {
2605 struct scsi_cmnd *cmd = qc->scsicmd;
2606 unsigned int err_mask = qc->err_mask;
2607
2608 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2609
2610 /* handle completion from new EH */
2611 if (unlikely(qc->ap->ops->error_handler &&
2612 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2613
2614 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2615 /* FIXME: not quite right; we don't want the
2616 * translation of taskfile registers into a
2617 * sense descriptors, since that's only
2618 * correct for ATA, not ATAPI
2619 */
2620 ata_gen_passthru_sense(qc);
2621 }
2622
2623 /* SCSI EH automatically locks door if sdev->locked is
2624 * set. Sometimes door lock request continues to
2625 * fail, for example, when no media is present. This
2626 * creates a loop - SCSI EH issues door lock which
2627 * fails and gets invoked again to acquire sense data
2628 * for the failed command.
2629 *
2630 * If door lock fails, always clear sdev->locked to
2631 * avoid this infinite loop.
2632 *
2633 * This may happen before SCSI scan is complete. Make
2634 * sure qc->dev->sdev isn't NULL before dereferencing.
2635 */
2636 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
2637 qc->dev->sdev->locked = 0;
2638
2639 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2640 qc->scsidone(cmd);
2641 ata_qc_free(qc);
2642 return;
2643 }
2644
2645 /* successful completion or old EH failure path */
2646 if (unlikely(err_mask & AC_ERR_DEV)) {
2647 cmd->result = SAM_STAT_CHECK_CONDITION;
2648 atapi_request_sense(qc);
2649 return;
2650 } else if (unlikely(err_mask)) {
2651 /* FIXME: not quite right; we don't want the
2652 * translation of taskfile registers into
2653 * a sense descriptors, since that's only
2654 * correct for ATA, not ATAPI
2655 */
2656 ata_gen_passthru_sense(qc);
2657 } else {
2658 u8 *scsicmd = cmd->cmnd;
2659
2660 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2661 unsigned long flags;
2662 u8 *buf;
2663
2664 buf = ata_scsi_rbuf_get(cmd, true, &flags);
2665
2666 /* ATAPI devices typically report zero for their SCSI version,
2667 * and sometimes deviate from the spec WRT response data
2668 * format. If SCSI version is reported as zero like normal,
2669 * then we make the following fixups: 1) Fake MMC-5 version,
2670 * to indicate to the Linux scsi midlayer this is a modern
2671 * device. 2) Ensure response data format / ATAPI information
2672 * are always correct.
2673 */
2674 if (buf[2] == 0) {
2675 buf[2] = 0x5;
2676 buf[3] = 0x32;
2677 }
2678
2679 ata_scsi_rbuf_put(cmd, true, &flags);
2680 }
2681
2682 cmd->result = SAM_STAT_GOOD;
2683 }
2684
2685 qc->scsidone(cmd);
2686 ata_qc_free(qc);
2687 }
2688 /**
2689 * atapi_xlat - Initialize PACKET taskfile
2690 * @qc: command structure to be initialized
2691 *
2692 * LOCKING:
2693 * spin_lock_irqsave(host lock)
2694 *
2695 * RETURNS:
2696 * Zero on success, non-zero on failure.
2697 */
2698 static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2699 {
2700 struct scsi_cmnd *scmd = qc->scsicmd;
2701 struct ata_device *dev = qc->dev;
2702 int nodata = (scmd->sc_data_direction == DMA_NONE);
2703 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2704 unsigned int nbytes;
2705
2706 memset(qc->cdb, 0, dev->cdb_len);
2707 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2708
2709 qc->complete_fn = atapi_qc_complete;
2710
2711 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2712 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2713 qc->tf.flags |= ATA_TFLAG_WRITE;
2714 DPRINTK("direction: write\n");
2715 }
2716
2717 qc->tf.command = ATA_CMD_PACKET;
2718 ata_qc_set_pc_nbytes(qc);
2719
2720 /* check whether ATAPI DMA is safe */
2721 if (!nodata && !using_pio && atapi_check_dma(qc))
2722 using_pio = 1;
2723
2724 /* Some controller variants snoop this value for Packet
2725 * transfers to do state machine and FIFO management. Thus we
2726 * want to set it properly, and for DMA where it is
2727 * effectively meaningless.
2728 */
2729 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2730
2731 /* Most ATAPI devices which honor transfer chunk size don't
2732 * behave according to the spec when odd chunk size which
2733 * matches the transfer length is specified. If the number of
2734 * bytes to transfer is 2n+1. According to the spec, what
2735 * should happen is to indicate that 2n+1 is going to be
2736 * transferred and transfer 2n+2 bytes where the last byte is
2737 * padding.
2738 *
2739 * In practice, this doesn't happen. ATAPI devices first
2740 * indicate and transfer 2n bytes and then indicate and
2741 * transfer 2 bytes where the last byte is padding.
2742 *
2743 * This inconsistency confuses several controllers which
2744 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2745 * These controllers use actual number of transferred bytes to
2746 * update DMA poitner and transfer of 4n+2 bytes make those
2747 * controller push DMA pointer by 4n+4 bytes because SATA data
2748 * FISes are aligned to 4 bytes. This causes data corruption
2749 * and buffer overrun.
2750 *
2751 * Always setting nbytes to even number solves this problem
2752 * because then ATAPI devices don't have to split data at 2n
2753 * boundaries.
2754 */
2755 if (nbytes & 0x1)
2756 nbytes++;
2757
2758 qc->tf.lbam = (nbytes & 0xFF);
2759 qc->tf.lbah = (nbytes >> 8);
2760
2761 if (nodata)
2762 qc->tf.protocol = ATAPI_PROT_NODATA;
2763 else if (using_pio)
2764 qc->tf.protocol = ATAPI_PROT_PIO;
2765 else {
2766 /* DMA data xfer */
2767 qc->tf.protocol = ATAPI_PROT_DMA;
2768 qc->tf.feature |= ATAPI_PKT_DMA;
2769
2770 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2771 (scmd->sc_data_direction != DMA_TO_DEVICE))
2772 /* some SATA bridges need us to indicate data xfer direction */
2773 qc->tf.feature |= ATAPI_DMADIR;
2774 }
2775
2776
2777 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2778 as ATAPI tape drives don't get this right otherwise */
2779 return 0;
2780 }
2781
2782 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2783 {
2784 if (!sata_pmp_attached(ap)) {
2785 if (likely(devno < ata_link_max_devices(&ap->link)))
2786 return &ap->link.device[devno];
2787 } else {
2788 if (likely(devno < ap->nr_pmp_links))
2789 return &ap->pmp_link[devno].device[0];
2790 }
2791
2792 return NULL;
2793 }
2794
2795 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2796 const struct scsi_device *scsidev)
2797 {
2798 int devno;
2799
2800 /* skip commands not addressed to targets we simulate */
2801 if (!sata_pmp_attached(ap)) {
2802 if (unlikely(scsidev->channel || scsidev->lun))
2803 return NULL;
2804 devno = scsidev->id;
2805 } else {
2806 if (unlikely(scsidev->id || scsidev->lun))
2807 return NULL;
2808 devno = scsidev->channel;
2809 }
2810
2811 return ata_find_dev(ap, devno);
2812 }
2813
2814 /**
2815 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2816 * @ap: ATA port to which the device is attached
2817 * @scsidev: SCSI device from which we derive the ATA device
2818 *
2819 * Given various information provided in struct scsi_cmnd,
2820 * map that onto an ATA bus, and using that mapping
2821 * determine which ata_device is associated with the
2822 * SCSI command to be sent.
2823 *
2824 * LOCKING:
2825 * spin_lock_irqsave(host lock)
2826 *
2827 * RETURNS:
2828 * Associated ATA device, or %NULL if not found.
2829 */
2830 static struct ata_device *
2831 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2832 {
2833 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2834
2835 if (unlikely(!dev || !ata_dev_enabled(dev)))
2836 return NULL;
2837
2838 return dev;
2839 }
2840
2841 /*
2842 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2843 * @byte1: Byte 1 from pass-thru CDB.
2844 *
2845 * RETURNS:
2846 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2847 */
2848 static u8
2849 ata_scsi_map_proto(u8 byte1)
2850 {
2851 switch((byte1 & 0x1e) >> 1) {
2852 case 3: /* Non-data */
2853 return ATA_PROT_NODATA;
2854
2855 case 6: /* DMA */
2856 case 10: /* UDMA Data-in */
2857 case 11: /* UDMA Data-Out */
2858 return ATA_PROT_DMA;
2859
2860 case 4: /* PIO Data-in */
2861 case 5: /* PIO Data-out */
2862 return ATA_PROT_PIO;
2863
2864 case 0: /* Hard Reset */
2865 case 1: /* SRST */
2866 case 8: /* Device Diagnostic */
2867 case 9: /* Device Reset */
2868 case 7: /* DMA Queued */
2869 case 12: /* FPDMA */
2870 case 15: /* Return Response Info */
2871 default: /* Reserved */
2872 break;
2873 }
2874
2875 return ATA_PROT_UNKNOWN;
2876 }
2877
2878 /**
2879 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2880 * @qc: command structure to be initialized
2881 *
2882 * Handles either 12 or 16-byte versions of the CDB.
2883 *
2884 * RETURNS:
2885 * Zero on success, non-zero on failure.
2886 */
2887 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2888 {
2889 struct ata_taskfile *tf = &(qc->tf);
2890 struct scsi_cmnd *scmd = qc->scsicmd;
2891 struct ata_device *dev = qc->dev;
2892 const u8 *cdb = scmd->cmnd;
2893
2894 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2895 goto invalid_fld;
2896
2897 /*
2898 * 12 and 16 byte CDBs use different offsets to
2899 * provide the various register values.
2900 */
2901 if (cdb[0] == ATA_16) {
2902 /*
2903 * 16-byte CDB - may contain extended commands.
2904 *
2905 * If that is the case, copy the upper byte register values.
2906 */
2907 if (cdb[1] & 0x01) {
2908 tf->hob_feature = cdb[3];
2909 tf->hob_nsect = cdb[5];
2910 tf->hob_lbal = cdb[7];
2911 tf->hob_lbam = cdb[9];
2912 tf->hob_lbah = cdb[11];
2913 tf->flags |= ATA_TFLAG_LBA48;
2914 } else
2915 tf->flags &= ~ATA_TFLAG_LBA48;
2916
2917 /*
2918 * Always copy low byte, device and command registers.
2919 */
2920 tf->feature = cdb[4];
2921 tf->nsect = cdb[6];
2922 tf->lbal = cdb[8];
2923 tf->lbam = cdb[10];
2924 tf->lbah = cdb[12];
2925 tf->device = cdb[13];
2926 tf->command = cdb[14];
2927 } else {
2928 /*
2929 * 12-byte CDB - incapable of extended commands.
2930 */
2931 tf->flags &= ~ATA_TFLAG_LBA48;
2932
2933 tf->feature = cdb[3];
2934 tf->nsect = cdb[4];
2935 tf->lbal = cdb[5];
2936 tf->lbam = cdb[6];
2937 tf->lbah = cdb[7];
2938 tf->device = cdb[8];
2939 tf->command = cdb[9];
2940 }
2941
2942 /* enforce correct master/slave bit */
2943 tf->device = dev->devno ?
2944 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2945
2946 switch (tf->command) {
2947 /* READ/WRITE LONG use a non-standard sect_size */
2948 case ATA_CMD_READ_LONG:
2949 case ATA_CMD_READ_LONG_ONCE:
2950 case ATA_CMD_WRITE_LONG:
2951 case ATA_CMD_WRITE_LONG_ONCE:
2952 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2953 goto invalid_fld;
2954 qc->sect_size = scsi_bufflen(scmd);
2955 break;
2956
2957 /* commands using reported Logical Block size (e.g. 512 or 4K) */
2958 case ATA_CMD_CFA_WRITE_NE:
2959 case ATA_CMD_CFA_TRANS_SECT:
2960 case ATA_CMD_CFA_WRITE_MULT_NE:
2961 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
2962 case ATA_CMD_READ:
2963 case ATA_CMD_READ_EXT:
2964 case ATA_CMD_READ_QUEUED:
2965 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
2966 case ATA_CMD_FPDMA_READ:
2967 case ATA_CMD_READ_MULTI:
2968 case ATA_CMD_READ_MULTI_EXT:
2969 case ATA_CMD_PIO_READ:
2970 case ATA_CMD_PIO_READ_EXT:
2971 case ATA_CMD_READ_STREAM_DMA_EXT:
2972 case ATA_CMD_READ_STREAM_EXT:
2973 case ATA_CMD_VERIFY:
2974 case ATA_CMD_VERIFY_EXT:
2975 case ATA_CMD_WRITE:
2976 case ATA_CMD_WRITE_EXT:
2977 case ATA_CMD_WRITE_FUA_EXT:
2978 case ATA_CMD_WRITE_QUEUED:
2979 case ATA_CMD_WRITE_QUEUED_FUA_EXT:
2980 case ATA_CMD_FPDMA_WRITE:
2981 case ATA_CMD_WRITE_MULTI:
2982 case ATA_CMD_WRITE_MULTI_EXT:
2983 case ATA_CMD_WRITE_MULTI_FUA_EXT:
2984 case ATA_CMD_PIO_WRITE:
2985 case ATA_CMD_PIO_WRITE_EXT:
2986 case ATA_CMD_WRITE_STREAM_DMA_EXT:
2987 case ATA_CMD_WRITE_STREAM_EXT:
2988 qc->sect_size = scmd->device->sector_size;
2989 break;
2990
2991 /* Everything else uses 512 byte "sectors" */
2992 default:
2993 qc->sect_size = ATA_SECT_SIZE;
2994 }
2995
2996 /*
2997 * Set flags so that all registers will be written, pass on
2998 * write indication (used for PIO/DMA setup), result TF is
2999 * copied back and we don't whine too much about its failure.
3000 */
3001 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3002 if (scmd->sc_data_direction == DMA_TO_DEVICE)
3003 tf->flags |= ATA_TFLAG_WRITE;
3004
3005 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
3006
3007 /*
3008 * Set transfer length.
3009 *
3010 * TODO: find out if we need to do more here to
3011 * cover scatter/gather case.
3012 */
3013 ata_qc_set_pc_nbytes(qc);
3014
3015 /* We may not issue DMA commands if no DMA mode is set */
3016 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
3017 goto invalid_fld;
3018
3019 /* sanity check for pio multi commands */
3020 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
3021 goto invalid_fld;
3022
3023 if (is_multi_taskfile(tf)) {
3024 unsigned int multi_count = 1 << (cdb[1] >> 5);
3025
3026 /* compare the passed through multi_count
3027 * with the cached multi_count of libata
3028 */
3029 if (multi_count != dev->multi_count)
3030 ata_dev_warn(dev, "invalid multi_count %u ignored\n",
3031 multi_count);
3032 }
3033
3034 /*
3035 * Filter SET_FEATURES - XFER MODE command -- otherwise,
3036 * SET_FEATURES - XFER MODE must be preceded/succeeded
3037 * by an update to hardware-specific registers for each
3038 * controller (i.e. the reason for ->set_piomode(),
3039 * ->set_dmamode(), and ->post_set_mode() hooks).
3040 */
3041 if (tf->command == ATA_CMD_SET_FEATURES &&
3042 tf->feature == SETFEATURES_XFER)
3043 goto invalid_fld;
3044
3045 /*
3046 * Filter TPM commands by default. These provide an
3047 * essentially uncontrolled encrypted "back door" between
3048 * applications and the disk. Set libata.allow_tpm=1 if you
3049 * have a real reason for wanting to use them. This ensures
3050 * that installed software cannot easily mess stuff up without
3051 * user intent. DVR type users will probably ship with this enabled
3052 * for movie content management.
3053 *
3054 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3055 * for this and should do in future but that it is not sufficient as
3056 * DCS is an optional feature set. Thus we also do the software filter
3057 * so that we comply with the TC consortium stated goal that the user
3058 * can turn off TC features of their system.
3059 */
3060 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
3061 goto invalid_fld;
3062
3063 return 0;
3064
3065 invalid_fld:
3066 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3067 /* "Invalid field in cdb" */
3068 return 1;
3069 }
3070
3071 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3072 {
3073 struct ata_taskfile *tf = &qc->tf;
3074 struct scsi_cmnd *scmd = qc->scsicmd;
3075 struct ata_device *dev = qc->dev;
3076 const u8 *cdb = scmd->cmnd;
3077 u64 block;
3078 u32 n_block;
3079 u32 size;
3080 void *buf;
3081
3082 /* we may not issue DMA commands if no DMA mode is set */
3083 if (unlikely(!dev->dma_mode))
3084 goto invalid_fld;
3085
3086 if (unlikely(scmd->cmd_len < 16))
3087 goto invalid_fld;
3088 scsi_16_lba_len(cdb, &block, &n_block);
3089
3090 /* for now we only support WRITE SAME with the unmap bit set */
3091 if (unlikely(!(cdb[1] & 0x8)))
3092 goto invalid_fld;
3093
3094 /*
3095 * WRITE SAME always has a sector sized buffer as payload, this
3096 * should never be a multiple entry S/G list.
3097 */
3098 if (!scsi_sg_count(scmd))
3099 goto invalid_fld;
3100
3101 buf = page_address(sg_page(scsi_sglist(scmd)));
3102 size = ata_set_lba_range_entries(buf, 512, block, n_block);
3103
3104 tf->protocol = ATA_PROT_DMA;
3105 tf->hob_feature = 0;
3106 tf->feature = ATA_DSM_TRIM;
3107 tf->hob_nsect = (size / 512) >> 8;
3108 tf->nsect = size / 512;
3109 tf->command = ATA_CMD_DSM;
3110 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3111 ATA_TFLAG_WRITE;
3112
3113 ata_qc_set_pc_nbytes(qc);
3114
3115 return 0;
3116
3117 invalid_fld:
3118 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3119 /* "Invalid field in cdb" */
3120 return 1;
3121 }
3122
3123 /**
3124 * ata_mselect_caching - Simulate MODE SELECT for caching info page
3125 * @qc: Storage for translated ATA taskfile
3126 * @buf: input buffer
3127 * @len: number of valid bytes in the input buffer
3128 *
3129 * Prepare a taskfile to modify caching information for the device.
3130 *
3131 * LOCKING:
3132 * None.
3133 */
3134 static int ata_mselect_caching(struct ata_queued_cmd *qc,
3135 const u8 *buf, int len)
3136 {
3137 struct ata_taskfile *tf = &qc->tf;
3138 struct ata_device *dev = qc->dev;
3139 char mpage[CACHE_MPAGE_LEN];
3140 u8 wce;
3141
3142 /*
3143 * The first two bytes of def_cache_mpage are a header, so offsets
3144 * in mpage are off by 2 compared to buf. Same for len.
3145 */
3146
3147 if (len != CACHE_MPAGE_LEN - 2)
3148 return -EINVAL;
3149
3150 wce = buf[0] & (1 << 2);
3151
3152 /*
3153 * Check that read-only bits are not modified.
3154 */
3155 ata_msense_caching(dev->id, mpage, false);
3156 mpage[2] &= ~(1 << 2);
3157 mpage[2] |= wce;
3158 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0)
3159 return -EINVAL;
3160
3161 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3162 tf->protocol = ATA_PROT_NODATA;
3163 tf->nsect = 0;
3164 tf->command = ATA_CMD_SET_FEATURES;
3165 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF;
3166 return 0;
3167 }
3168
3169 /**
3170 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands
3171 * @qc: Storage for translated ATA taskfile
3172 *
3173 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
3174 * Assume this is invoked for direct access devices (e.g. disks) only.
3175 * There should be no block descriptor for other device types.
3176 *
3177 * LOCKING:
3178 * spin_lock_irqsave(host lock)
3179 */
3180 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
3181 {
3182 struct scsi_cmnd *scmd = qc->scsicmd;
3183 const u8 *cdb = scmd->cmnd;
3184 const u8 *p;
3185 u8 pg, spg;
3186 unsigned six_byte, pg_len, hdr_len, bd_len;
3187 int len;
3188
3189 VPRINTK("ENTER\n");
3190
3191 six_byte = (cdb[0] == MODE_SELECT);
3192 if (six_byte) {
3193 if (scmd->cmd_len < 5)
3194 goto invalid_fld;
3195
3196 len = cdb[4];
3197 hdr_len = 4;
3198 } else {
3199 if (scmd->cmd_len < 9)
3200 goto invalid_fld;
3201
3202 len = (cdb[7] << 8) + cdb[8];
3203 hdr_len = 8;
3204 }
3205
3206 /* We only support PF=1, SP=0. */
3207 if ((cdb[1] & 0x11) != 0x10)
3208 goto invalid_fld;
3209
3210 /* Test early for possible overrun. */
3211 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len)
3212 goto invalid_param_len;
3213
3214 p = page_address(sg_page(scsi_sglist(scmd)));
3215
3216 /* Move past header and block descriptors. */
3217 if (len < hdr_len)
3218 goto invalid_param_len;
3219
3220 if (six_byte)
3221 bd_len = p[3];
3222 else
3223 bd_len = (p[6] << 8) + p[7];
3224
3225 len -= hdr_len;
3226 p += hdr_len;
3227 if (len < bd_len)
3228 goto invalid_param_len;
3229 if (bd_len != 0 && bd_len != 8)
3230 goto invalid_param;
3231
3232 len -= bd_len;
3233 p += bd_len;
3234 if (len == 0)
3235 goto skip;
3236
3237 /* Parse both possible formats for the mode page headers. */
3238 pg = p[0] & 0x3f;
3239 if (p[0] & 0x40) {
3240 if (len < 4)
3241 goto invalid_param_len;
3242
3243 spg = p[1];
3244 pg_len = (p[2] << 8) | p[3];
3245 p += 4;
3246 len -= 4;
3247 } else {
3248 if (len < 2)
3249 goto invalid_param_len;
3250
3251 spg = 0;
3252 pg_len = p[1];
3253 p += 2;
3254 len -= 2;
3255 }
3256
3257 /*
3258 * No mode subpages supported (yet) but asking for _all_
3259 * subpages may be valid
3260 */
3261 if (spg && (spg != ALL_SUB_MPAGES))
3262 goto invalid_param;
3263 if (pg_len > len)
3264 goto invalid_param_len;
3265
3266 switch (pg) {
3267 case CACHE_MPAGE:
3268 if (ata_mselect_caching(qc, p, pg_len) < 0)
3269 goto invalid_param;
3270 break;
3271
3272 default: /* invalid page code */
3273 goto invalid_param;
3274 }
3275
3276 /*
3277 * Only one page has changeable data, so we only support setting one
3278 * page at a time.
3279 */
3280 if (len > pg_len)
3281 goto invalid_param;
3282
3283 return 0;
3284
3285 invalid_fld:
3286 /* "Invalid field in CDB" */
3287 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
3288 return 1;
3289
3290 invalid_param:
3291 /* "Invalid field in parameter list" */
3292 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0);
3293 return 1;
3294
3295 invalid_param_len:
3296 /* "Parameter list length error" */
3297 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3298 return 1;
3299
3300 skip:
3301 scmd->result = SAM_STAT_GOOD;
3302 return 1;
3303 }
3304
3305 /**
3306 * ata_get_xlat_func - check if SCSI to ATA translation is possible
3307 * @dev: ATA device
3308 * @cmd: SCSI command opcode to consider
3309 *
3310 * Look up the SCSI command given, and determine whether the
3311 * SCSI command is to be translated or simulated.
3312 *
3313 * RETURNS:
3314 * Pointer to translation function if possible, %NULL if not.
3315 */
3316
3317 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
3318 {
3319 switch (cmd) {
3320 case READ_6:
3321 case READ_10:
3322 case READ_16:
3323
3324 case WRITE_6:
3325 case WRITE_10:
3326 case WRITE_16:
3327 return ata_scsi_rw_xlat;
3328
3329 case WRITE_SAME_16:
3330 return ata_scsi_write_same_xlat;
3331
3332 case SYNCHRONIZE_CACHE:
3333 if (ata_try_flush_cache(dev))
3334 return ata_scsi_flush_xlat;
3335 break;
3336
3337 case VERIFY:
3338 case VERIFY_16:
3339 return ata_scsi_verify_xlat;
3340
3341 case ATA_12:
3342 case ATA_16:
3343 return ata_scsi_pass_thru;
3344
3345 case MODE_SELECT:
3346 case MODE_SELECT_10:
3347 return ata_scsi_mode_select_xlat;
3348 break;
3349
3350 case START_STOP:
3351 return ata_scsi_start_stop_xlat;
3352 }
3353
3354 return NULL;
3355 }
3356
3357 /**
3358 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3359 * @ap: ATA port to which the command was being sent
3360 * @cmd: SCSI command to dump
3361 *
3362 * Prints the contents of a SCSI command via printk().
3363 */
3364
3365 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
3366 struct scsi_cmnd *cmd)
3367 {
3368 #ifdef ATA_DEBUG
3369 struct scsi_device *scsidev = cmd->device;
3370 u8 *scsicmd = cmd->cmnd;
3371
3372 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
3373 ap->print_id,
3374 scsidev->channel, scsidev->id, scsidev->lun,
3375 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
3376 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
3377 scsicmd[8]);
3378 #endif
3379 }
3380
3381 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
3382 struct ata_device *dev)
3383 {
3384 u8 scsi_op = scmd->cmnd[0];
3385 ata_xlat_func_t xlat_func;
3386 int rc = 0;
3387
3388 if (dev->class == ATA_DEV_ATA) {
3389 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
3390 goto bad_cdb_len;
3391
3392 xlat_func = ata_get_xlat_func(dev, scsi_op);
3393 } else {
3394 if (unlikely(!scmd->cmd_len))
3395 goto bad_cdb_len;
3396
3397 xlat_func = NULL;
3398 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
3399 /* relay SCSI command to ATAPI device */
3400 int len = COMMAND_SIZE(scsi_op);
3401 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
3402 goto bad_cdb_len;
3403
3404 xlat_func = atapi_xlat;
3405 } else {
3406 /* ATA_16 passthru, treat as an ATA command */
3407 if (unlikely(scmd->cmd_len > 16))
3408 goto bad_cdb_len;
3409
3410 xlat_func = ata_get_xlat_func(dev, scsi_op);
3411 }
3412 }
3413
3414 if (xlat_func)
3415 rc = ata_scsi_translate(dev, scmd, xlat_func);
3416 else
3417 ata_scsi_simulate(dev, scmd);
3418
3419 return rc;
3420
3421 bad_cdb_len:
3422 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3423 scmd->cmd_len, scsi_op, dev->cdb_len);
3424 scmd->result = DID_ERROR << 16;
3425 scmd->scsi_done(scmd);
3426 return 0;
3427 }
3428
3429 /**
3430 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3431 * @shost: SCSI host of command to be sent
3432 * @cmd: SCSI command to be sent
3433 *
3434 * In some cases, this function translates SCSI commands into
3435 * ATA taskfiles, and queues the taskfiles to be sent to
3436 * hardware. In other cases, this function simulates a
3437 * SCSI device by evaluating and responding to certain
3438 * SCSI commands. This creates the overall effect of
3439 * ATA and ATAPI devices appearing as SCSI devices.
3440 *
3441 * LOCKING:
3442 * ATA host lock
3443 *
3444 * RETURNS:
3445 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3446 * 0 otherwise.
3447 */
3448 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
3449 {
3450 struct ata_port *ap;
3451 struct ata_device *dev;
3452 struct scsi_device *scsidev = cmd->device;
3453 int rc = 0;
3454 unsigned long irq_flags;
3455
3456 ap = ata_shost_to_port(shost);
3457
3458 spin_lock_irqsave(ap->lock, irq_flags);
3459
3460 ata_scsi_dump_cdb(ap, cmd);
3461
3462 dev = ata_scsi_find_dev(ap, scsidev);
3463 if (likely(dev))
3464 rc = __ata_scsi_queuecmd(cmd, dev);
3465 else {
3466 cmd->result = (DID_BAD_TARGET << 16);
3467 cmd->scsi_done(cmd);
3468 }
3469
3470 spin_unlock_irqrestore(ap->lock, irq_flags);
3471
3472 return rc;
3473 }
3474
3475 /**
3476 * ata_scsi_simulate - simulate SCSI command on ATA device
3477 * @dev: the target device
3478 * @cmd: SCSI command being sent to device.
3479 *
3480 * Interprets and directly executes a select list of SCSI commands
3481 * that can be handled internally.
3482 *
3483 * LOCKING:
3484 * spin_lock_irqsave(host lock)
3485 */
3486
3487 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
3488 {
3489 struct ata_scsi_args args;
3490 const u8 *scsicmd = cmd->cmnd;
3491 u8 tmp8;
3492
3493 args.dev = dev;
3494 args.id = dev->id;
3495 args.cmd = cmd;
3496 args.done = cmd->scsi_done;
3497
3498 switch(scsicmd[0]) {
3499 /* TODO: worth improving? */
3500 case FORMAT_UNIT:
3501 ata_scsi_invalid_field(cmd);
3502 break;
3503
3504 case INQUIRY:
3505 if (scsicmd[1] & 2) /* is CmdDt set? */
3506 ata_scsi_invalid_field(cmd);
3507 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3508 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3509 else switch (scsicmd[2]) {
3510 case 0x00:
3511 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3512 break;
3513 case 0x80:
3514 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3515 break;
3516 case 0x83:
3517 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3518 break;
3519 case 0x89:
3520 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3521 break;
3522 case 0xb0:
3523 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
3524 break;
3525 case 0xb1:
3526 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3527 break;
3528 case 0xb2:
3529 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
3530 break;
3531 default:
3532 ata_scsi_invalid_field(cmd);
3533 break;
3534 }
3535 break;
3536
3537 case MODE_SENSE:
3538 case MODE_SENSE_10:
3539 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3540 break;
3541
3542 case READ_CAPACITY:
3543 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3544 break;
3545
3546 case SERVICE_ACTION_IN:
3547 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3548 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3549 else
3550 ata_scsi_invalid_field(cmd);
3551 break;
3552
3553 case REPORT_LUNS:
3554 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3555 break;
3556
3557 case REQUEST_SENSE:
3558 ata_scsi_set_sense(cmd, 0, 0, 0);
3559 cmd->result = (DRIVER_SENSE << 24);
3560 cmd->scsi_done(cmd);
3561 break;
3562
3563 /* if we reach this, then writeback caching is disabled,
3564 * turning this into a no-op.
3565 */
3566 case SYNCHRONIZE_CACHE:
3567 /* fall through */
3568
3569 /* no-op's, complete with success */
3570 case REZERO_UNIT:
3571 case SEEK_6:
3572 case SEEK_10:
3573 case TEST_UNIT_READY:
3574 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3575 break;
3576
3577 case SEND_DIAGNOSTIC:
3578 tmp8 = scsicmd[1] & ~(1 << 3);
3579 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3580 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3581 else
3582 ata_scsi_invalid_field(cmd);
3583 break;
3584
3585 /* all other commands */
3586 default:
3587 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3588 /* "Invalid command operation code" */
3589 cmd->scsi_done(cmd);
3590 break;
3591 }
3592 }
3593
3594 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3595 {
3596 int i, rc;
3597
3598 for (i = 0; i < host->n_ports; i++) {
3599 struct ata_port *ap = host->ports[i];
3600 struct Scsi_Host *shost;
3601
3602 rc = -ENOMEM;
3603 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3604 if (!shost)
3605 goto err_alloc;
3606
3607 shost->eh_noresume = 1;
3608 *(struct ata_port **)&shost->hostdata[0] = ap;
3609 ap->scsi_host = shost;
3610
3611 shost->transportt = ata_scsi_transport_template;
3612 shost->unique_id = ap->print_id;
3613 shost->max_id = 16;
3614 shost->max_lun = 1;
3615 shost->max_channel = 1;
3616 shost->max_cmd_len = 16;
3617
3618 /* Schedule policy is determined by ->qc_defer()
3619 * callback and it needs to see every deferred qc.
3620 * Set host_blocked to 1 to prevent SCSI midlayer from
3621 * automatically deferring requests.
3622 */
3623 shost->max_host_blocked = 1;
3624
3625 rc = scsi_add_host_with_dma(ap->scsi_host,
3626 &ap->tdev, ap->host->dev);
3627 if (rc)
3628 goto err_add;
3629 }
3630
3631 return 0;
3632
3633 err_add:
3634 scsi_host_put(host->ports[i]->scsi_host);
3635 err_alloc:
3636 while (--i >= 0) {
3637 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3638
3639 scsi_remove_host(shost);
3640 scsi_host_put(shost);
3641 }
3642 return rc;
3643 }
3644
3645 void ata_scsi_scan_host(struct ata_port *ap, int sync)
3646 {
3647 int tries = 5;
3648 struct ata_device *last_failed_dev = NULL;
3649 struct ata_link *link;
3650 struct ata_device *dev;
3651
3652 repeat:
3653 ata_for_each_link(link, ap, EDGE) {
3654 ata_for_each_dev(dev, link, ENABLED) {
3655 struct scsi_device *sdev;
3656 int channel = 0, id = 0;
3657
3658 if (dev->sdev)
3659 continue;
3660
3661 if (ata_is_host_link(link))
3662 id = dev->devno;
3663 else
3664 channel = link->pmp;
3665
3666 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3667 NULL);
3668 if (!IS_ERR(sdev)) {
3669 dev->sdev = sdev;
3670 scsi_device_put(sdev);
3671 ata_acpi_bind(dev);
3672 } else {
3673 dev->sdev = NULL;
3674 }
3675 }
3676 }
3677
3678 /* If we scanned while EH was in progress or allocation
3679 * failure occurred, scan would have failed silently. Check
3680 * whether all devices are attached.
3681 */
3682 ata_for_each_link(link, ap, EDGE) {
3683 ata_for_each_dev(dev, link, ENABLED) {
3684 if (!dev->sdev)
3685 goto exit_loop;
3686 }
3687 }
3688 exit_loop:
3689 if (!link)
3690 return;
3691
3692 /* we're missing some SCSI devices */
3693 if (sync) {
3694 /* If caller requested synchrnous scan && we've made
3695 * any progress, sleep briefly and repeat.
3696 */
3697 if (dev != last_failed_dev) {
3698 msleep(100);
3699 last_failed_dev = dev;
3700 goto repeat;
3701 }
3702
3703 /* We might be failing to detect boot device, give it
3704 * a few more chances.
3705 */
3706 if (--tries) {
3707 msleep(100);
3708 goto repeat;
3709 }
3710
3711 ata_port_err(ap,
3712 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
3713 }
3714
3715 queue_delayed_work(system_long_wq, &ap->hotplug_task,
3716 round_jiffies_relative(HZ));
3717 }
3718
3719 /**
3720 * ata_scsi_offline_dev - offline attached SCSI device
3721 * @dev: ATA device to offline attached SCSI device for
3722 *
3723 * This function is called from ata_eh_hotplug() and responsible
3724 * for taking the SCSI device attached to @dev offline. This
3725 * function is called with host lock which protects dev->sdev
3726 * against clearing.
3727 *
3728 * LOCKING:
3729 * spin_lock_irqsave(host lock)
3730 *
3731 * RETURNS:
3732 * 1 if attached SCSI device exists, 0 otherwise.
3733 */
3734 int ata_scsi_offline_dev(struct ata_device *dev)
3735 {
3736 if (dev->sdev) {
3737 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3738 return 1;
3739 }
3740 return 0;
3741 }
3742
3743 /**
3744 * ata_scsi_remove_dev - remove attached SCSI device
3745 * @dev: ATA device to remove attached SCSI device for
3746 *
3747 * This function is called from ata_eh_scsi_hotplug() and
3748 * responsible for removing the SCSI device attached to @dev.
3749 *
3750 * LOCKING:
3751 * Kernel thread context (may sleep).
3752 */
3753 static void ata_scsi_remove_dev(struct ata_device *dev)
3754 {
3755 struct ata_port *ap = dev->link->ap;
3756 struct scsi_device *sdev;
3757 unsigned long flags;
3758
3759 /* Alas, we need to grab scan_mutex to ensure SCSI device
3760 * state doesn't change underneath us and thus
3761 * scsi_device_get() always succeeds. The mutex locking can
3762 * be removed if there is __scsi_device_get() interface which
3763 * increments reference counts regardless of device state.
3764 */
3765 mutex_lock(&ap->scsi_host->scan_mutex);
3766 spin_lock_irqsave(ap->lock, flags);
3767
3768 if (zpodd_dev_enabled(dev))
3769 zpodd_exit(dev);
3770 ata_acpi_unbind(dev);
3771
3772 /* clearing dev->sdev is protected by host lock */
3773 sdev = dev->sdev;
3774 dev->sdev = NULL;
3775
3776 if (sdev) {
3777 /* If user initiated unplug races with us, sdev can go
3778 * away underneath us after the host lock and
3779 * scan_mutex are released. Hold onto it.
3780 */
3781 if (scsi_device_get(sdev) == 0) {
3782 /* The following ensures the attached sdev is
3783 * offline on return from ata_scsi_offline_dev()
3784 * regardless it wins or loses the race
3785 * against this function.
3786 */
3787 scsi_device_set_state(sdev, SDEV_OFFLINE);
3788 } else {
3789 WARN_ON(1);
3790 sdev = NULL;
3791 }
3792 }
3793
3794 spin_unlock_irqrestore(ap->lock, flags);
3795 mutex_unlock(&ap->scsi_host->scan_mutex);
3796
3797 if (sdev) {
3798 ata_dev_info(dev, "detaching (SCSI %s)\n",
3799 dev_name(&sdev->sdev_gendev));
3800
3801 scsi_remove_device(sdev);
3802 scsi_device_put(sdev);
3803 }
3804 }
3805
3806 static void ata_scsi_handle_link_detach(struct ata_link *link)
3807 {
3808 struct ata_port *ap = link->ap;
3809 struct ata_device *dev;
3810
3811 ata_for_each_dev(dev, link, ALL) {
3812 unsigned long flags;
3813
3814 if (!(dev->flags & ATA_DFLAG_DETACHED))
3815 continue;
3816
3817 spin_lock_irqsave(ap->lock, flags);
3818 dev->flags &= ~ATA_DFLAG_DETACHED;
3819 spin_unlock_irqrestore(ap->lock, flags);
3820
3821 ata_scsi_remove_dev(dev);
3822 }
3823 }
3824
3825 /**
3826 * ata_scsi_media_change_notify - send media change event
3827 * @dev: Pointer to the disk device with media change event
3828 *
3829 * Tell the block layer to send a media change notification
3830 * event.
3831 *
3832 * LOCKING:
3833 * spin_lock_irqsave(host lock)
3834 */
3835 void ata_scsi_media_change_notify(struct ata_device *dev)
3836 {
3837 if (dev->sdev)
3838 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3839 GFP_ATOMIC);
3840 }
3841
3842 /**
3843 * ata_scsi_hotplug - SCSI part of hotplug
3844 * @work: Pointer to ATA port to perform SCSI hotplug on
3845 *
3846 * Perform SCSI part of hotplug. It's executed from a separate
3847 * workqueue after EH completes. This is necessary because SCSI
3848 * hot plugging requires working EH and hot unplugging is
3849 * synchronized with hot plugging with a mutex.
3850 *
3851 * LOCKING:
3852 * Kernel thread context (may sleep).
3853 */
3854 void ata_scsi_hotplug(struct work_struct *work)
3855 {
3856 struct ata_port *ap =
3857 container_of(work, struct ata_port, hotplug_task.work);
3858 int i;
3859
3860 if (ap->pflags & ATA_PFLAG_UNLOADING) {
3861 DPRINTK("ENTER/EXIT - unloading\n");
3862 return;
3863 }
3864
3865 DPRINTK("ENTER\n");
3866 mutex_lock(&ap->scsi_scan_mutex);
3867
3868 /* Unplug detached devices. We cannot use link iterator here
3869 * because PMP links have to be scanned even if PMP is
3870 * currently not attached. Iterate manually.
3871 */
3872 ata_scsi_handle_link_detach(&ap->link);
3873 if (ap->pmp_link)
3874 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3875 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3876
3877 /* scan for new ones */
3878 ata_scsi_scan_host(ap, 0);
3879
3880 mutex_unlock(&ap->scsi_scan_mutex);
3881 DPRINTK("EXIT\n");
3882 }
3883
3884 /**
3885 * ata_scsi_user_scan - indication for user-initiated bus scan
3886 * @shost: SCSI host to scan
3887 * @channel: Channel to scan
3888 * @id: ID to scan
3889 * @lun: LUN to scan
3890 *
3891 * This function is called when user explicitly requests bus
3892 * scan. Set probe pending flag and invoke EH.
3893 *
3894 * LOCKING:
3895 * SCSI layer (we don't care)
3896 *
3897 * RETURNS:
3898 * Zero.
3899 */
3900 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3901 unsigned int id, unsigned int lun)
3902 {
3903 struct ata_port *ap = ata_shost_to_port(shost);
3904 unsigned long flags;
3905 int devno, rc = 0;
3906
3907 if (!ap->ops->error_handler)
3908 return -EOPNOTSUPP;
3909
3910 if (lun != SCAN_WILD_CARD && lun)
3911 return -EINVAL;
3912
3913 if (!sata_pmp_attached(ap)) {
3914 if (channel != SCAN_WILD_CARD && channel)
3915 return -EINVAL;
3916 devno = id;
3917 } else {
3918 if (id != SCAN_WILD_CARD && id)
3919 return -EINVAL;
3920 devno = channel;
3921 }
3922
3923 spin_lock_irqsave(ap->lock, flags);
3924
3925 if (devno == SCAN_WILD_CARD) {
3926 struct ata_link *link;
3927
3928 ata_for_each_link(link, ap, EDGE) {
3929 struct ata_eh_info *ehi = &link->eh_info;
3930 ehi->probe_mask |= ATA_ALL_DEVICES;
3931 ehi->action |= ATA_EH_RESET;
3932 }
3933 } else {
3934 struct ata_device *dev = ata_find_dev(ap, devno);
3935
3936 if (dev) {
3937 struct ata_eh_info *ehi = &dev->link->eh_info;
3938 ehi->probe_mask |= 1 << dev->devno;
3939 ehi->action |= ATA_EH_RESET;
3940 } else
3941 rc = -EINVAL;
3942 }
3943
3944 if (rc == 0) {
3945 ata_port_schedule_eh(ap);
3946 spin_unlock_irqrestore(ap->lock, flags);
3947 ata_port_wait_eh(ap);
3948 } else
3949 spin_unlock_irqrestore(ap->lock, flags);
3950
3951 return rc;
3952 }
3953
3954 /**
3955 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3956 * @work: Pointer to ATA port to perform scsi_rescan_device()
3957 *
3958 * After ATA pass thru (SAT) commands are executed successfully,
3959 * libata need to propagate the changes to SCSI layer.
3960 *
3961 * LOCKING:
3962 * Kernel thread context (may sleep).
3963 */
3964 void ata_scsi_dev_rescan(struct work_struct *work)
3965 {
3966 struct ata_port *ap =
3967 container_of(work, struct ata_port, scsi_rescan_task);
3968 struct ata_link *link;
3969 struct ata_device *dev;
3970 unsigned long flags;
3971
3972 mutex_lock(&ap->scsi_scan_mutex);
3973 spin_lock_irqsave(ap->lock, flags);
3974
3975 ata_for_each_link(link, ap, EDGE) {
3976 ata_for_each_dev(dev, link, ENABLED) {
3977 struct scsi_device *sdev = dev->sdev;
3978
3979 if (!sdev)
3980 continue;
3981 if (scsi_device_get(sdev))
3982 continue;
3983
3984 spin_unlock_irqrestore(ap->lock, flags);
3985 scsi_rescan_device(&(sdev->sdev_gendev));
3986 scsi_device_put(sdev);
3987 spin_lock_irqsave(ap->lock, flags);
3988 }
3989 }
3990
3991 spin_unlock_irqrestore(ap->lock, flags);
3992 mutex_unlock(&ap->scsi_scan_mutex);
3993 }
3994
3995 /**
3996 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3997 * @host: ATA host container for all SAS ports
3998 * @port_info: Information from low-level host driver
3999 * @shost: SCSI host that the scsi device is attached to
4000 *
4001 * LOCKING:
4002 * PCI/etc. bus probe sem.
4003 *
4004 * RETURNS:
4005 * ata_port pointer on success / NULL on failure.
4006 */
4007
4008 struct ata_port *ata_sas_port_alloc(struct ata_host *host,
4009 struct ata_port_info *port_info,
4010 struct Scsi_Host *shost)
4011 {
4012 struct ata_port *ap;
4013
4014 ap = ata_port_alloc(host);
4015 if (!ap)
4016 return NULL;
4017
4018 ap->port_no = 0;
4019 ap->lock = &host->lock;
4020 ap->pio_mask = port_info->pio_mask;
4021 ap->mwdma_mask = port_info->mwdma_mask;
4022 ap->udma_mask = port_info->udma_mask;
4023 ap->flags |= port_info->flags;
4024 ap->ops = port_info->port_ops;
4025 ap->cbl = ATA_CBL_SATA;
4026
4027 return ap;
4028 }
4029 EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
4030
4031 /**
4032 * ata_sas_port_start - Set port up for dma.
4033 * @ap: Port to initialize
4034 *
4035 * Called just after data structures for each port are
4036 * initialized.
4037 *
4038 * May be used as the port_start() entry in ata_port_operations.
4039 *
4040 * LOCKING:
4041 * Inherited from caller.
4042 */
4043 int ata_sas_port_start(struct ata_port *ap)
4044 {
4045 /*
4046 * the port is marked as frozen at allocation time, but if we don't
4047 * have new eh, we won't thaw it
4048 */
4049 if (!ap->ops->error_handler)
4050 ap->pflags &= ~ATA_PFLAG_FROZEN;
4051 return 0;
4052 }
4053 EXPORT_SYMBOL_GPL(ata_sas_port_start);
4054
4055 /**
4056 * ata_port_stop - Undo ata_sas_port_start()
4057 * @ap: Port to shut down
4058 *
4059 * May be used as the port_stop() entry in ata_port_operations.
4060 *
4061 * LOCKING:
4062 * Inherited from caller.
4063 */
4064
4065 void ata_sas_port_stop(struct ata_port *ap)
4066 {
4067 }
4068 EXPORT_SYMBOL_GPL(ata_sas_port_stop);
4069
4070 /**
4071 * ata_sas_async_probe - simply schedule probing and return
4072 * @ap: Port to probe
4073 *
4074 * For batch scheduling of probe for sas attached ata devices, assumes
4075 * the port has already been through ata_sas_port_init()
4076 */
4077 void ata_sas_async_probe(struct ata_port *ap)
4078 {
4079 __ata_port_probe(ap);
4080 }
4081 EXPORT_SYMBOL_GPL(ata_sas_async_probe);
4082
4083 int ata_sas_sync_probe(struct ata_port *ap)
4084 {
4085 return ata_port_probe(ap);
4086 }
4087 EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
4088
4089
4090 /**
4091 * ata_sas_port_init - Initialize a SATA device
4092 * @ap: SATA port to initialize
4093 *
4094 * LOCKING:
4095 * PCI/etc. bus probe sem.
4096 *
4097 * RETURNS:
4098 * Zero on success, non-zero on error.
4099 */
4100
4101 int ata_sas_port_init(struct ata_port *ap)
4102 {
4103 int rc = ap->ops->port_start(ap);
4104
4105 if (rc)
4106 return rc;
4107 ap->print_id = atomic_inc_return(&ata_print_id);
4108 return 0;
4109 }
4110 EXPORT_SYMBOL_GPL(ata_sas_port_init);
4111
4112 /**
4113 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
4114 * @ap: SATA port to destroy
4115 *
4116 */
4117
4118 void ata_sas_port_destroy(struct ata_port *ap)
4119 {
4120 if (ap->ops->port_stop)
4121 ap->ops->port_stop(ap);
4122 kfree(ap);
4123 }
4124 EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
4125
4126 /**
4127 * ata_sas_slave_configure - Default slave_config routine for libata devices
4128 * @sdev: SCSI device to configure
4129 * @ap: ATA port to which SCSI device is attached
4130 *
4131 * RETURNS:
4132 * Zero.
4133 */
4134
4135 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
4136 {
4137 ata_scsi_sdev_config(sdev);
4138 ata_scsi_dev_config(sdev, ap->link.device);
4139 return 0;
4140 }
4141 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
4142
4143 /**
4144 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
4145 * @cmd: SCSI command to be sent
4146 * @ap: ATA port to which the command is being sent
4147 *
4148 * RETURNS:
4149 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4150 * 0 otherwise.
4151 */
4152
4153 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
4154 {
4155 int rc = 0;
4156
4157 ata_scsi_dump_cdb(ap, cmd);
4158
4159 if (likely(ata_dev_enabled(ap->link.device)))
4160 rc = __ata_scsi_queuecmd(cmd, ap->link.device);
4161 else {
4162 cmd->result = (DID_BAD_TARGET << 16);
4163 cmd->scsi_done(cmd);
4164 }
4165 return rc;
4166 }
4167 EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
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