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Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[linux-2.6/mini2440.git] / drivers / ata / libata-scsi.c
blob342316064e9ffe88b8962910908c345593c9ef1a
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/kernel.h>
37 #include <linux/blkdev.h>
38 #include <linux/spinlock.h>
39 #include <scsi/scsi.h>
40 #include <scsi/scsi_host.h>
41 #include <scsi/scsi_cmnd.h>
42 #include <scsi/scsi_eh.h>
43 #include <scsi/scsi_device.h>
44 #include <scsi/scsi_tcq.h>
45 #include <scsi/scsi_transport.h>
46 #include <linux/libata.h>
47 #include <linux/hdreg.h>
48 #include <linux/uaccess.h>
49 #include <linux/suspend.h>
50
51 #include "libata.h"
52
53 #define SECTOR_SIZE 512
54 #define ATA_SCSI_RBUF_SIZE 4096
55
56 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
57 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
58
59 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
60
61 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
62 const struct scsi_device *scsidev);
63 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
64 const struct scsi_device *scsidev);
65 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
66 unsigned int id, unsigned int lun);
67
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 /*
108 * libata transport template. libata doesn't do real transport stuff.
109 * It just needs the eh_timed_out hook.
110 */
111 static struct scsi_transport_template ata_scsi_transport_template = {
112 .eh_strategy_handler = ata_scsi_error,
113 .eh_timed_out = ata_scsi_timed_out,
114 .user_scan = ata_scsi_user_scan,
115 };
116
117
118 static const struct {
119 enum link_pm value;
120 const char *name;
121 } link_pm_policy[] = {
122 { NOT_AVAILABLE, "max_performance" },
123 { MIN_POWER, "min_power" },
124 { MAX_PERFORMANCE, "max_performance" },
125 { MEDIUM_POWER, "medium_power" },
126 };
127
128 static const char *ata_scsi_lpm_get(enum link_pm policy)
129 {
130 int i;
131
132 for (i = 0; i < ARRAY_SIZE(link_pm_policy); i++)
133 if (link_pm_policy[i].value == policy)
134 return link_pm_policy[i].name;
135
136 return NULL;
137 }
138
139 static ssize_t ata_scsi_lpm_put(struct device *dev,
140 struct device_attribute *attr,
141 const char *buf, size_t count)
142 {
143 struct Scsi_Host *shost = class_to_shost(dev);
144 struct ata_port *ap = ata_shost_to_port(shost);
145 enum link_pm policy = 0;
146 int i;
147
148 /*
149 * we are skipping array location 0 on purpose - this
150 * is because a value of NOT_AVAILABLE is displayed
151 * to the user as max_performance, but when the user
152 * writes "max_performance", they actually want the
153 * value to match MAX_PERFORMANCE.
154 */
155 for (i = 1; i < ARRAY_SIZE(link_pm_policy); i++) {
156 const int len = strlen(link_pm_policy[i].name);
157 if (strncmp(link_pm_policy[i].name, buf, len) == 0 &&
158 buf[len] == '\n') {
159 policy = link_pm_policy[i].value;
160 break;
161 }
162 }
163 if (!policy)
164 return -EINVAL;
165
166 ata_lpm_schedule(ap, policy);
167 return count;
168 }
169
170 static ssize_t
171 ata_scsi_lpm_show(struct device *dev, struct device_attribute *attr, char *buf)
172 {
173 struct Scsi_Host *shost = class_to_shost(dev);
174 struct ata_port *ap = ata_shost_to_port(shost);
175 const char *policy =
176 ata_scsi_lpm_get(ap->pm_policy);
177
178 if (!policy)
179 return -EINVAL;
180
181 return snprintf(buf, 23, "%s\n", policy);
182 }
183 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
184 ata_scsi_lpm_show, ata_scsi_lpm_put);
185 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
186
187 static ssize_t ata_scsi_park_show(struct device *device,
188 struct device_attribute *attr, char *buf)
189 {
190 struct scsi_device *sdev = to_scsi_device(device);
191 struct ata_port *ap;
192 struct ata_link *link;
193 struct ata_device *dev;
194 unsigned long flags, now;
195 unsigned int uninitialized_var(msecs);
196 int rc = 0;
197
198 ap = ata_shost_to_port(sdev->host);
199
200 spin_lock_irqsave(ap->lock, flags);
201 dev = ata_scsi_find_dev(ap, sdev);
202 if (!dev) {
203 rc = -ENODEV;
204 goto unlock;
205 }
206 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
207 rc = -EOPNOTSUPP;
208 goto unlock;
209 }
210
211 link = dev->link;
212 now = jiffies;
213 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
214 link->eh_context.unloaded_mask & (1 << dev->devno) &&
215 time_after(dev->unpark_deadline, now))
216 msecs = jiffies_to_msecs(dev->unpark_deadline - now);
217 else
218 msecs = 0;
219
220 unlock:
221 spin_unlock_irq(ap->lock);
222
223 return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
224 }
225
226 static ssize_t ata_scsi_park_store(struct device *device,
227 struct device_attribute *attr,
228 const char *buf, size_t len)
229 {
230 struct scsi_device *sdev = to_scsi_device(device);
231 struct ata_port *ap;
232 struct ata_device *dev;
233 long int input;
234 unsigned long flags;
235 int rc;
236
237 rc = strict_strtol(buf, 10, &input);
238 if (rc || input < -2)
239 return -EINVAL;
240 if (input > ATA_TMOUT_MAX_PARK) {
241 rc = -EOVERFLOW;
242 input = ATA_TMOUT_MAX_PARK;
243 }
244
245 ap = ata_shost_to_port(sdev->host);
246
247 spin_lock_irqsave(ap->lock, flags);
248 dev = ata_scsi_find_dev(ap, sdev);
249 if (unlikely(!dev)) {
250 rc = -ENODEV;
251 goto unlock;
252 }
253 if (dev->class != ATA_DEV_ATA) {
254 rc = -EOPNOTSUPP;
255 goto unlock;
256 }
257
258 if (input >= 0) {
259 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
260 rc = -EOPNOTSUPP;
261 goto unlock;
262 }
263
264 dev->unpark_deadline = ata_deadline(jiffies, input);
265 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
266 ata_port_schedule_eh(ap);
267 complete(&ap->park_req_pending);
268 } else {
269 switch (input) {
270 case -1:
271 dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
272 break;
273 case -2:
274 dev->flags |= ATA_DFLAG_NO_UNLOAD;
275 break;
276 }
277 }
278 unlock:
279 spin_unlock_irqrestore(ap->lock, flags);
280
281 return rc ? rc : len;
282 }
283 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
284 ata_scsi_park_show, ata_scsi_park_store);
285 EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
286
287 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
288 {
289 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
290
291 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
292 }
293
294 static ssize_t
295 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
296 const char *buf, size_t count)
297 {
298 struct Scsi_Host *shost = class_to_shost(dev);
299 struct ata_port *ap = ata_shost_to_port(shost);
300 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
301 return ap->ops->em_store(ap, buf, count);
302 return -EINVAL;
303 }
304
305 static ssize_t
306 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
307 char *buf)
308 {
309 struct Scsi_Host *shost = class_to_shost(dev);
310 struct ata_port *ap = ata_shost_to_port(shost);
311
312 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
313 return ap->ops->em_show(ap, buf);
314 return -EINVAL;
315 }
316 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
317 ata_scsi_em_message_show, ata_scsi_em_message_store);
318 EXPORT_SYMBOL_GPL(dev_attr_em_message);
319
320 static ssize_t
321 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
322 char *buf)
323 {
324 struct Scsi_Host *shost = class_to_shost(dev);
325 struct ata_port *ap = ata_shost_to_port(shost);
326
327 return snprintf(buf, 23, "%d\n", ap->em_message_type);
328 }
329 DEVICE_ATTR(em_message_type, S_IRUGO,
330 ata_scsi_em_message_type_show, NULL);
331 EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
332
333 static ssize_t
334 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
335 char *buf)
336 {
337 struct scsi_device *sdev = to_scsi_device(dev);
338 struct ata_port *ap = ata_shost_to_port(sdev->host);
339 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
340
341 if (ap->ops->sw_activity_show && (ap->flags & ATA_FLAG_SW_ACTIVITY))
342 return ap->ops->sw_activity_show(atadev, buf);
343 return -EINVAL;
344 }
345
346 static ssize_t
347 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
348 const char *buf, size_t count)
349 {
350 struct scsi_device *sdev = to_scsi_device(dev);
351 struct ata_port *ap = ata_shost_to_port(sdev->host);
352 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
353 enum sw_activity val;
354 int rc;
355
356 if (ap->ops->sw_activity_store && (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
357 val = simple_strtoul(buf, NULL, 0);
358 switch (val) {
359 case OFF: case BLINK_ON: case BLINK_OFF:
360 rc = ap->ops->sw_activity_store(atadev, val);
361 if (!rc)
362 return count;
363 else
364 return rc;
365 }
366 }
367 return -EINVAL;
368 }
369 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
370 ata_scsi_activity_store);
371 EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
372
373 struct device_attribute *ata_common_sdev_attrs[] = {
374 &dev_attr_unload_heads,
375 NULL
376 };
377 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
378
379 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
380 void (*done)(struct scsi_cmnd *))
381 {
382 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
383 /* "Invalid field in cbd" */
384 done(cmd);
385 }
386
387 /**
388 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
389 * @sdev: SCSI device for which BIOS geometry is to be determined
390 * @bdev: block device associated with @sdev
391 * @capacity: capacity of SCSI device
392 * @geom: location to which geometry will be output
393 *
394 * Generic bios head/sector/cylinder calculator
395 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
396 * mapping. Some situations may arise where the disk is not
397 * bootable if this is not used.
398 *
399 * LOCKING:
400 * Defined by the SCSI layer. We don't really care.
401 *
402 * RETURNS:
403 * Zero.
404 */
405 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
406 sector_t capacity, int geom[])
407 {
408 geom[0] = 255;
409 geom[1] = 63;
410 sector_div(capacity, 255*63);
411 geom[2] = capacity;
412
413 return 0;
414 }
415
416 /**
417 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
418 * @ap: target port
419 * @sdev: SCSI device to get identify data for
420 * @arg: User buffer area for identify data
421 *
422 * LOCKING:
423 * Defined by the SCSI layer. We don't really care.
424 *
425 * RETURNS:
426 * Zero on success, negative errno on error.
427 */
428 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
429 void __user *arg)
430 {
431 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
432 u16 __user *dst = arg;
433 char buf[40];
434
435 if (!dev)
436 return -ENOMSG;
437
438 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
439 return -EFAULT;
440
441 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
442 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
443 return -EFAULT;
444
445 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
446 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
447 return -EFAULT;
448
449 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
450 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
451 return -EFAULT;
452
453 return 0;
454 }
455
456 /**
457 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
458 * @scsidev: Device to which we are issuing command
459 * @arg: User provided data for issuing command
460 *
461 * LOCKING:
462 * Defined by the SCSI layer. We don't really care.
463 *
464 * RETURNS:
465 * Zero on success, negative errno on error.
466 */
467 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
468 {
469 int rc = 0;
470 u8 scsi_cmd[MAX_COMMAND_SIZE];
471 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
472 int argsize = 0;
473 enum dma_data_direction data_dir;
474 int cmd_result;
475
476 if (arg == NULL)
477 return -EINVAL;
478
479 if (copy_from_user(args, arg, sizeof(args)))
480 return -EFAULT;
481
482 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
483 if (!sensebuf)
484 return -ENOMEM;
485
486 memset(scsi_cmd, 0, sizeof(scsi_cmd));
487
488 if (args[3]) {
489 argsize = SECTOR_SIZE * args[3];
490 argbuf = kmalloc(argsize, GFP_KERNEL);
491 if (argbuf == NULL) {
492 rc = -ENOMEM;
493 goto error;
494 }
495
496 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
497 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
498 block count in sector count field */
499 data_dir = DMA_FROM_DEVICE;
500 } else {
501 scsi_cmd[1] = (3 << 1); /* Non-data */
502 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
503 data_dir = DMA_NONE;
504 }
505
506 scsi_cmd[0] = ATA_16;
507
508 scsi_cmd[4] = args[2];
509 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
510 scsi_cmd[6] = args[3];
511 scsi_cmd[8] = args[1];
512 scsi_cmd[10] = 0x4f;
513 scsi_cmd[12] = 0xc2;
514 } else {
515 scsi_cmd[6] = args[1];
516 }
517 scsi_cmd[14] = args[0];
518
519 /* Good values for timeout and retries? Values below
520 from scsi_ioctl_send_command() for default case... */
521 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
522 sensebuf, (10*HZ), 5, 0, NULL);
523
524 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
525 u8 *desc = sensebuf + 8;
526 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
527
528 /* If we set cc then ATA pass-through will cause a
529 * check condition even if no error. Filter that. */
530 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
531 struct scsi_sense_hdr sshdr;
532 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
533 &sshdr);
534 if (sshdr.sense_key == 0 &&
535 sshdr.asc == 0 && sshdr.ascq == 0)
536 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
537 }
538
539 /* Send userspace a few ATA registers (same as drivers/ide) */
540 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
541 desc[0] == 0x09) { /* code is "ATA Descriptor" */
542 args[0] = desc[13]; /* status */
543 args[1] = desc[3]; /* error */
544 args[2] = desc[5]; /* sector count (0:7) */
545 if (copy_to_user(arg, args, sizeof(args)))
546 rc = -EFAULT;
547 }
548 }
549
550
551 if (cmd_result) {
552 rc = -EIO;
553 goto error;
554 }
555
556 if ((argbuf)
557 && copy_to_user(arg + sizeof(args), argbuf, argsize))
558 rc = -EFAULT;
559 error:
560 kfree(sensebuf);
561 kfree(argbuf);
562 return rc;
563 }
564
565 /**
566 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
567 * @scsidev: Device to which we are issuing command
568 * @arg: User provided data for issuing command
569 *
570 * LOCKING:
571 * Defined by the SCSI layer. We don't really care.
572 *
573 * RETURNS:
574 * Zero on success, negative errno on error.
575 */
576 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
577 {
578 int rc = 0;
579 u8 scsi_cmd[MAX_COMMAND_SIZE];
580 u8 args[7], *sensebuf = NULL;
581 int cmd_result;
582
583 if (arg == NULL)
584 return -EINVAL;
585
586 if (copy_from_user(args, arg, sizeof(args)))
587 return -EFAULT;
588
589 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
590 if (!sensebuf)
591 return -ENOMEM;
592
593 memset(scsi_cmd, 0, sizeof(scsi_cmd));
594 scsi_cmd[0] = ATA_16;
595 scsi_cmd[1] = (3 << 1); /* Non-data */
596 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
597 scsi_cmd[4] = args[1];
598 scsi_cmd[6] = args[2];
599 scsi_cmd[8] = args[3];
600 scsi_cmd[10] = args[4];
601 scsi_cmd[12] = args[5];
602 scsi_cmd[13] = args[6] & 0x4f;
603 scsi_cmd[14] = args[0];
604
605 /* Good values for timeout and retries? Values below
606 from scsi_ioctl_send_command() for default case... */
607 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
608 sensebuf, (10*HZ), 5, 0, NULL);
609
610 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
611 u8 *desc = sensebuf + 8;
612 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
613
614 /* If we set cc then ATA pass-through will cause a
615 * check condition even if no error. Filter that. */
616 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
617 struct scsi_sense_hdr sshdr;
618 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
619 &sshdr);
620 if (sshdr.sense_key == 0 &&
621 sshdr.asc == 0 && sshdr.ascq == 0)
622 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
623 }
624
625 /* Send userspace ATA registers */
626 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
627 desc[0] == 0x09) {/* code is "ATA Descriptor" */
628 args[0] = desc[13]; /* status */
629 args[1] = desc[3]; /* error */
630 args[2] = desc[5]; /* sector count (0:7) */
631 args[3] = desc[7]; /* lbal */
632 args[4] = desc[9]; /* lbam */
633 args[5] = desc[11]; /* lbah */
634 args[6] = desc[12]; /* select */
635 if (copy_to_user(arg, args, sizeof(args)))
636 rc = -EFAULT;
637 }
638 }
639
640 if (cmd_result) {
641 rc = -EIO;
642 goto error;
643 }
644
645 error:
646 kfree(sensebuf);
647 return rc;
648 }
649
650 static int ata_ioc32(struct ata_port *ap)
651 {
652 if (ap->flags & ATA_FLAG_PIO_DMA)
653 return 1;
654 if (ap->pflags & ATA_PFLAG_PIO32)
655 return 1;
656 return 0;
657 }
658
659 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
660 int cmd, void __user *arg)
661 {
662 int val = -EINVAL, rc = -EINVAL;
663 unsigned long flags;
664
665 switch (cmd) {
666 case ATA_IOC_GET_IO32:
667 spin_lock_irqsave(ap->lock, flags);
668 val = ata_ioc32(ap);
669 spin_unlock_irqrestore(ap->lock, flags);
670 if (copy_to_user(arg, &val, 1))
671 return -EFAULT;
672 return 0;
673
674 case ATA_IOC_SET_IO32:
675 val = (unsigned long) arg;
676 rc = 0;
677 spin_lock_irqsave(ap->lock, flags);
678 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
679 if (val)
680 ap->pflags |= ATA_PFLAG_PIO32;
681 else
682 ap->pflags &= ~ATA_PFLAG_PIO32;
683 } else {
684 if (val != ata_ioc32(ap))
685 rc = -EINVAL;
686 }
687 spin_unlock_irqrestore(ap->lock, flags);
688 return rc;
689
690 case HDIO_GET_IDENTITY:
691 return ata_get_identity(ap, scsidev, arg);
692
693 case HDIO_DRIVE_CMD:
694 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
695 return -EACCES;
696 return ata_cmd_ioctl(scsidev, arg);
697
698 case HDIO_DRIVE_TASK:
699 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
700 return -EACCES;
701 return ata_task_ioctl(scsidev, arg);
702
703 default:
704 rc = -ENOTTY;
705 break;
706 }
707
708 return rc;
709 }
710 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
711
712 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
713 {
714 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
715 scsidev, cmd, arg);
716 }
717 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
718
719 /**
720 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
721 * @dev: ATA device to which the new command is attached
722 * @cmd: SCSI command that originated this ATA command
723 * @done: SCSI command completion function
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 void (*done)(struct scsi_cmnd *))
742 {
743 struct ata_queued_cmd *qc;
744
745 qc = ata_qc_new_init(dev);
746 if (qc) {
747 qc->scsicmd = cmd;
748 qc->scsidone = done;
749
750 qc->sg = scsi_sglist(cmd);
751 qc->n_elem = scsi_sg_count(cmd);
752 } else {
753 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
754 done(cmd);
755 }
756
757 return qc;
758 }
759
760 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
761 {
762 struct scsi_cmnd *scmd = qc->scsicmd;
763
764 qc->extrabytes = scmd->request->extra_len;
765 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
766 }
767
768 /**
769 * ata_dump_status - user friendly display of error info
770 * @id: id of the port in question
771 * @tf: ptr to filled out taskfile
772 *
773 * Decode and dump the ATA error/status registers for the user so
774 * that they have some idea what really happened at the non
775 * make-believe layer.
776 *
777 * LOCKING:
778 * inherited from caller
779 */
780 static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
781 {
782 u8 stat = tf->command, err = tf->feature;
783
784 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
785 if (stat & ATA_BUSY) {
786 printk("Busy }\n"); /* Data is not valid in this case */
787 } else {
788 if (stat & 0x40) printk("DriveReady ");
789 if (stat & 0x20) printk("DeviceFault ");
790 if (stat & 0x10) printk("SeekComplete ");
791 if (stat & 0x08) printk("DataRequest ");
792 if (stat & 0x04) printk("CorrectedError ");
793 if (stat & 0x02) printk("Index ");
794 if (stat & 0x01) printk("Error ");
795 printk("}\n");
796
797 if (err) {
798 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
799 if (err & 0x04) printk("DriveStatusError ");
800 if (err & 0x80) {
801 if (err & 0x04) printk("BadCRC ");
802 else printk("Sector ");
803 }
804 if (err & 0x40) printk("UncorrectableError ");
805 if (err & 0x10) printk("SectorIdNotFound ");
806 if (err & 0x02) printk("TrackZeroNotFound ");
807 if (err & 0x01) printk("AddrMarkNotFound ");
808 printk("}\n");
809 }
810 }
811 }
812
813 /**
814 * ata_to_sense_error - convert ATA error to SCSI error
815 * @id: ATA device number
816 * @drv_stat: value contained in ATA status register
817 * @drv_err: value contained in ATA error register
818 * @sk: the sense key we'll fill out
819 * @asc: the additional sense code we'll fill out
820 * @ascq: the additional sense code qualifier we'll fill out
821 * @verbose: be verbose
822 *
823 * Converts an ATA error into a SCSI error. Fill out pointers to
824 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
825 * format sense blocks.
826 *
827 * LOCKING:
828 * spin_lock_irqsave(host lock)
829 */
830 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
831 u8 *asc, u8 *ascq, int verbose)
832 {
833 int i;
834
835 /* Based on the 3ware driver translation table */
836 static const unsigned char sense_table[][4] = {
837 /* BBD|ECC|ID|MAR */
838 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
839 /* BBD|ECC|ID */
840 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
841 /* ECC|MC|MARK */
842 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
843 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
844 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
845 /* MC|ID|ABRT|TRK0|MARK */
846 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
847 /* MCR|MARK */
848 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
849 /* Bad address mark */
850 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
851 /* TRK0 */
852 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
853 /* Abort & !ICRC */
854 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
855 /* Media change request */
856 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
857 /* SRV */
858 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
859 /* Media change */
860 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
861 /* ECC */
862 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
863 /* BBD - block marked bad */
864 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
865 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
866 };
867 static const unsigned char stat_table[][4] = {
868 /* Must be first because BUSY means no other bits valid */
869 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
870 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
871 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
872 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
873 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
874 };
875
876 /*
877 * Is this an error we can process/parse
878 */
879 if (drv_stat & ATA_BUSY) {
880 drv_err = 0; /* Ignore the err bits, they're invalid */
881 }
882
883 if (drv_err) {
884 /* Look for drv_err */
885 for (i = 0; sense_table[i][0] != 0xFF; i++) {
886 /* Look for best matches first */
887 if ((sense_table[i][0] & drv_err) ==
888 sense_table[i][0]) {
889 *sk = sense_table[i][1];
890 *asc = sense_table[i][2];
891 *ascq = sense_table[i][3];
892 goto translate_done;
893 }
894 }
895 /* No immediate match */
896 if (verbose)
897 printk(KERN_WARNING "ata%u: no sense translation for "
898 "error 0x%02x\n", id, drv_err);
899 }
900
901 /* Fall back to interpreting status bits */
902 for (i = 0; stat_table[i][0] != 0xFF; i++) {
903 if (stat_table[i][0] & drv_stat) {
904 *sk = stat_table[i][1];
905 *asc = stat_table[i][2];
906 *ascq = stat_table[i][3];
907 goto translate_done;
908 }
909 }
910 /* No error? Undecoded? */
911 if (verbose)
912 printk(KERN_WARNING "ata%u: no sense translation for "
913 "status: 0x%02x\n", id, drv_stat);
914
915 /* We need a sensible error return here, which is tricky, and one
916 that won't cause people to do things like return a disk wrongly */
917 *sk = ABORTED_COMMAND;
918 *asc = 0x00;
919 *ascq = 0x00;
920
921 translate_done:
922 if (verbose)
923 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
924 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
925 id, drv_stat, drv_err, *sk, *asc, *ascq);
926 return;
927 }
928
929 /*
930 * ata_gen_passthru_sense - Generate check condition sense block.
931 * @qc: Command that completed.
932 *
933 * This function is specific to the ATA descriptor format sense
934 * block specified for the ATA pass through commands. Regardless
935 * of whether the command errored or not, return a sense
936 * block. Copy all controller registers into the sense
937 * block. Clear sense key, ASC & ASCQ if there is no error.
938 *
939 * LOCKING:
940 * None.
941 */
942 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
943 {
944 struct scsi_cmnd *cmd = qc->scsicmd;
945 struct ata_taskfile *tf = &qc->result_tf;
946 unsigned char *sb = cmd->sense_buffer;
947 unsigned char *desc = sb + 8;
948 int verbose = qc->ap->ops->error_handler == NULL;
949
950 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
951
952 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
953
954 /*
955 * Use ata_to_sense_error() to map status register bits
956 * onto sense key, asc & ascq.
957 */
958 if (qc->err_mask ||
959 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
960 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
961 &sb[1], &sb[2], &sb[3], verbose);
962 sb[1] &= 0x0f;
963 }
964
965 /*
966 * Sense data is current and format is descriptor.
967 */
968 sb[0] = 0x72;
969
970 desc[0] = 0x09;
971
972 /* set length of additional sense data */
973 sb[7] = 14;
974 desc[1] = 12;
975
976 /*
977 * Copy registers into sense buffer.
978 */
979 desc[2] = 0x00;
980 desc[3] = tf->feature; /* == error reg */
981 desc[5] = tf->nsect;
982 desc[7] = tf->lbal;
983 desc[9] = tf->lbam;
984 desc[11] = tf->lbah;
985 desc[12] = tf->device;
986 desc[13] = tf->command; /* == status reg */
987
988 /*
989 * Fill in Extend bit, and the high order bytes
990 * if applicable.
991 */
992 if (tf->flags & ATA_TFLAG_LBA48) {
993 desc[2] |= 0x01;
994 desc[4] = tf->hob_nsect;
995 desc[6] = tf->hob_lbal;
996 desc[8] = tf->hob_lbam;
997 desc[10] = tf->hob_lbah;
998 }
999 }
1000
1001 /**
1002 * ata_gen_ata_sense - generate a SCSI fixed sense block
1003 * @qc: Command that we are erroring out
1004 *
1005 * Generate sense block for a failed ATA command @qc. Descriptor
1006 * format is used to accomodate LBA48 block address.
1007 *
1008 * LOCKING:
1009 * None.
1010 */
1011 static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
1012 {
1013 struct ata_device *dev = qc->dev;
1014 struct scsi_cmnd *cmd = qc->scsicmd;
1015 struct ata_taskfile *tf = &qc->result_tf;
1016 unsigned char *sb = cmd->sense_buffer;
1017 unsigned char *desc = sb + 8;
1018 int verbose = qc->ap->ops->error_handler == NULL;
1019 u64 block;
1020
1021 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1022
1023 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
1024
1025 /* sense data is current and format is descriptor */
1026 sb[0] = 0x72;
1027
1028 /* Use ata_to_sense_error() to map status register bits
1029 * onto sense key, asc & ascq.
1030 */
1031 if (qc->err_mask ||
1032 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
1033 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
1034 &sb[1], &sb[2], &sb[3], verbose);
1035 sb[1] &= 0x0f;
1036 }
1037
1038 block = ata_tf_read_block(&qc->result_tf, dev);
1039
1040 /* information sense data descriptor */
1041 sb[7] = 12;
1042 desc[0] = 0x00;
1043 desc[1] = 10;
1044
1045 desc[2] |= 0x80; /* valid */
1046 desc[6] = block >> 40;
1047 desc[7] = block >> 32;
1048 desc[8] = block >> 24;
1049 desc[9] = block >> 16;
1050 desc[10] = block >> 8;
1051 desc[11] = block;
1052 }
1053
1054 static void ata_scsi_sdev_config(struct scsi_device *sdev)
1055 {
1056 sdev->use_10_for_rw = 1;
1057 sdev->use_10_for_ms = 1;
1058
1059 /* Schedule policy is determined by ->qc_defer() callback and
1060 * it needs to see every deferred qc. Set dev_blocked to 1 to
1061 * prevent SCSI midlayer from automatically deferring
1062 * requests.
1063 */
1064 sdev->max_device_blocked = 1;
1065 }
1066
1067 /**
1068 * atapi_drain_needed - Check whether data transfer may overflow
1069 * @rq: request to be checked
1070 *
1071 * ATAPI commands which transfer variable length data to host
1072 * might overflow due to application error or hardare bug. This
1073 * function checks whether overflow should be drained and ignored
1074 * for @request.
1075 *
1076 * LOCKING:
1077 * None.
1078 *
1079 * RETURNS:
1080 * 1 if ; otherwise, 0.
1081 */
1082 static int atapi_drain_needed(struct request *rq)
1083 {
1084 if (likely(!blk_pc_request(rq)))
1085 return 0;
1086
1087 if (!rq->data_len || (rq->cmd_flags & REQ_RW))
1088 return 0;
1089
1090 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1091 }
1092
1093 static int ata_scsi_dev_config(struct scsi_device *sdev,
1094 struct ata_device *dev)
1095 {
1096 if (!ata_id_has_unload(dev->id))
1097 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1098
1099 /* configure max sectors */
1100 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);
1101
1102 if (dev->class == ATA_DEV_ATAPI) {
1103 struct request_queue *q = sdev->request_queue;
1104 void *buf;
1105
1106 /* set the min alignment and padding */
1107 blk_queue_update_dma_alignment(sdev->request_queue,
1108 ATA_DMA_PAD_SZ - 1);
1109 blk_queue_update_dma_pad(sdev->request_queue,
1110 ATA_DMA_PAD_SZ - 1);
1111
1112 /* configure draining */
1113 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1114 if (!buf) {
1115 ata_dev_printk(dev, KERN_ERR,
1116 "drain buffer allocation failed\n");
1117 return -ENOMEM;
1118 }
1119
1120 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1121 } else {
1122 if (ata_id_is_ssd(dev->id))
1123 queue_flag_set_unlocked(QUEUE_FLAG_NONROT,
1124 sdev->request_queue);
1125
1126 /* ATA devices must be sector aligned */
1127 blk_queue_update_dma_alignment(sdev->request_queue,
1128 ATA_SECT_SIZE - 1);
1129 sdev->manage_start_stop = 1;
1130 }
1131
1132 if (dev->flags & ATA_DFLAG_AN)
1133 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1134
1135 if (dev->flags & ATA_DFLAG_NCQ) {
1136 int depth;
1137
1138 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1139 depth = min(ATA_MAX_QUEUE - 1, depth);
1140 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
1141 }
1142
1143 return 0;
1144 }
1145
1146 /**
1147 * ata_scsi_slave_config - Set SCSI device attributes
1148 * @sdev: SCSI device to examine
1149 *
1150 * This is called before we actually start reading
1151 * and writing to the device, to configure certain
1152 * SCSI mid-layer behaviors.
1153 *
1154 * LOCKING:
1155 * Defined by SCSI layer. We don't really care.
1156 */
1157
1158 int ata_scsi_slave_config(struct scsi_device *sdev)
1159 {
1160 struct ata_port *ap = ata_shost_to_port(sdev->host);
1161 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1162 int rc = 0;
1163
1164 ata_scsi_sdev_config(sdev);
1165
1166 if (dev)
1167 rc = ata_scsi_dev_config(sdev, dev);
1168
1169 return rc;
1170 }
1171
1172 /**
1173 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1174 * @sdev: SCSI device to be destroyed
1175 *
1176 * @sdev is about to be destroyed for hot/warm unplugging. If
1177 * this unplugging was initiated by libata as indicated by NULL
1178 * dev->sdev, this function doesn't have to do anything.
1179 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1180 * Clear dev->sdev, schedule the device for ATA detach and invoke
1181 * EH.
1182 *
1183 * LOCKING:
1184 * Defined by SCSI layer. We don't really care.
1185 */
1186 void ata_scsi_slave_destroy(struct scsi_device *sdev)
1187 {
1188 struct ata_port *ap = ata_shost_to_port(sdev->host);
1189 struct request_queue *q = sdev->request_queue;
1190 unsigned long flags;
1191 struct ata_device *dev;
1192
1193 if (!ap->ops->error_handler)
1194 return;
1195
1196 spin_lock_irqsave(ap->lock, flags);
1197 dev = __ata_scsi_find_dev(ap, sdev);
1198 if (dev && dev->sdev) {
1199 /* SCSI device already in CANCEL state, no need to offline it */
1200 dev->sdev = NULL;
1201 dev->flags |= ATA_DFLAG_DETACH;
1202 ata_port_schedule_eh(ap);
1203 }
1204 spin_unlock_irqrestore(ap->lock, flags);
1205
1206 kfree(q->dma_drain_buffer);
1207 q->dma_drain_buffer = NULL;
1208 q->dma_drain_size = 0;
1209 }
1210
1211 /**
1212 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1213 * @sdev: SCSI device to configure queue depth for
1214 * @queue_depth: new queue depth
1215 *
1216 * This is libata standard hostt->change_queue_depth callback.
1217 * SCSI will call into this callback when user tries to set queue
1218 * depth via sysfs.
1219 *
1220 * LOCKING:
1221 * SCSI layer (we don't care)
1222 *
1223 * RETURNS:
1224 * Newly configured queue depth.
1225 */
1226 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
1227 {
1228 struct ata_port *ap = ata_shost_to_port(sdev->host);
1229 struct ata_device *dev;
1230 unsigned long flags;
1231
1232 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1233 return sdev->queue_depth;
1234
1235 dev = ata_scsi_find_dev(ap, sdev);
1236 if (!dev || !ata_dev_enabled(dev))
1237 return sdev->queue_depth;
1238
1239 /* NCQ enabled? */
1240 spin_lock_irqsave(ap->lock, flags);
1241 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1242 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1243 dev->flags |= ATA_DFLAG_NCQ_OFF;
1244 queue_depth = 1;
1245 }
1246 spin_unlock_irqrestore(ap->lock, flags);
1247
1248 /* limit and apply queue depth */
1249 queue_depth = min(queue_depth, sdev->host->can_queue);
1250 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1251 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1252
1253 if (sdev->queue_depth == queue_depth)
1254 return -EINVAL;
1255
1256 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
1257 return queue_depth;
1258 }
1259
1260 /* XXX: for spindown warning */
1261 static void ata_delayed_done_timerfn(unsigned long arg)
1262 {
1263 struct scsi_cmnd *scmd = (void *)arg;
1264
1265 scmd->scsi_done(scmd);
1266 }
1267
1268 /* XXX: for spindown warning */
1269 static void ata_delayed_done(struct scsi_cmnd *scmd)
1270 {
1271 static struct timer_list timer;
1272
1273 setup_timer(&timer, ata_delayed_done_timerfn, (unsigned long)scmd);
1274 mod_timer(&timer, jiffies + 5 * HZ);
1275 }
1276
1277 /**
1278 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1279 * @qc: Storage for translated ATA taskfile
1280 *
1281 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1282 * (to start). Perhaps these commands should be preceded by
1283 * CHECK POWER MODE to see what power mode the device is already in.
1284 * [See SAT revision 5 at www.t10.org]
1285 *
1286 * LOCKING:
1287 * spin_lock_irqsave(host lock)
1288 *
1289 * RETURNS:
1290 * Zero on success, non-zero on error.
1291 */
1292 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1293 {
1294 struct scsi_cmnd *scmd = qc->scsicmd;
1295 struct ata_taskfile *tf = &qc->tf;
1296 const u8 *cdb = scmd->cmnd;
1297
1298 if (scmd->cmd_len < 5)
1299 goto invalid_fld;
1300
1301 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1302 tf->protocol = ATA_PROT_NODATA;
1303 if (cdb[1] & 0x1) {
1304 ; /* ignore IMMED bit, violates sat-r05 */
1305 }
1306 if (cdb[4] & 0x2)
1307 goto invalid_fld; /* LOEJ bit set not supported */
1308 if (((cdb[4] >> 4) & 0xf) != 0)
1309 goto invalid_fld; /* power conditions not supported */
1310
1311 if (cdb[4] & 0x1) {
1312 tf->nsect = 1; /* 1 sector, lba=0 */
1313
1314 if (qc->dev->flags & ATA_DFLAG_LBA) {
1315 tf->flags |= ATA_TFLAG_LBA;
1316
1317 tf->lbah = 0x0;
1318 tf->lbam = 0x0;
1319 tf->lbal = 0x0;
1320 tf->device |= ATA_LBA;
1321 } else {
1322 /* CHS */
1323 tf->lbal = 0x1; /* sect */
1324 tf->lbam = 0x0; /* cyl low */
1325 tf->lbah = 0x0; /* cyl high */
1326 }
1327
1328 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
1329 } else {
1330 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1331 * or S5) causing some drives to spin up and down again.
1332 */
1333 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1334 system_state == SYSTEM_POWER_OFF)
1335 goto skip;
1336
1337 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1338 system_entering_hibernation())
1339 goto skip;
1340
1341 /* XXX: This is for backward compatibility, will be
1342 * removed. Read Documentation/feature-removal-schedule.txt
1343 * for more info.
1344 */
1345 if ((qc->dev->flags & ATA_DFLAG_SPUNDOWN) &&
1346 (system_state == SYSTEM_HALT ||
1347 system_state == SYSTEM_POWER_OFF)) {
1348 static unsigned long warned;
1349
1350 if (!test_and_set_bit(0, &warned)) {
1351 ata_dev_printk(qc->dev, KERN_WARNING,
1352 "DISK MIGHT NOT BE SPUN DOWN PROPERLY. "
1353 "UPDATE SHUTDOWN UTILITY\n");
1354 ata_dev_printk(qc->dev, KERN_WARNING,
1355 "For more info, visit "
1356 "http://linux-ata.org/shutdown.html\n");
1357
1358 /* ->scsi_done is not used, use it for
1359 * delayed completion.
1360 */
1361 scmd->scsi_done = qc->scsidone;
1362 qc->scsidone = ata_delayed_done;
1363 }
1364 goto skip;
1365 }
1366
1367 /* Issue ATA STANDBY IMMEDIATE command */
1368 tf->command = ATA_CMD_STANDBYNOW1;
1369 }
1370
1371 /*
1372 * Standby and Idle condition timers could be implemented but that
1373 * would require libata to implement the Power condition mode page
1374 * and allow the user to change it. Changing mode pages requires
1375 * MODE SELECT to be implemented.
1376 */
1377
1378 return 0;
1379
1380 invalid_fld:
1381 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1382 /* "Invalid field in cbd" */
1383 return 1;
1384 skip:
1385 scmd->result = SAM_STAT_GOOD;
1386 return 1;
1387 }
1388
1389
1390 /**
1391 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1392 * @qc: Storage for translated ATA taskfile
1393 *
1394 * Sets up an ATA taskfile to issue FLUSH CACHE or
1395 * FLUSH CACHE EXT.
1396 *
1397 * LOCKING:
1398 * spin_lock_irqsave(host lock)
1399 *
1400 * RETURNS:
1401 * Zero on success, non-zero on error.
1402 */
1403 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1404 {
1405 struct ata_taskfile *tf = &qc->tf;
1406
1407 tf->flags |= ATA_TFLAG_DEVICE;
1408 tf->protocol = ATA_PROT_NODATA;
1409
1410 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1411 tf->command = ATA_CMD_FLUSH_EXT;
1412 else
1413 tf->command = ATA_CMD_FLUSH;
1414
1415 /* flush is critical for IO integrity, consider it an IO command */
1416 qc->flags |= ATA_QCFLAG_IO;
1417
1418 return 0;
1419 }
1420
1421 /**
1422 * scsi_6_lba_len - Get LBA and transfer length
1423 * @cdb: SCSI command to translate
1424 *
1425 * Calculate LBA and transfer length for 6-byte commands.
1426 *
1427 * RETURNS:
1428 * @plba: the LBA
1429 * @plen: the transfer length
1430 */
1431 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1432 {
1433 u64 lba = 0;
1434 u32 len;
1435
1436 VPRINTK("six-byte command\n");
1437
1438 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1439 lba |= ((u64)cdb[2]) << 8;
1440 lba |= ((u64)cdb[3]);
1441
1442 len = cdb[4];
1443
1444 *plba = lba;
1445 *plen = len;
1446 }
1447
1448 /**
1449 * scsi_10_lba_len - Get LBA and transfer length
1450 * @cdb: SCSI command to translate
1451 *
1452 * Calculate LBA and transfer length for 10-byte commands.
1453 *
1454 * RETURNS:
1455 * @plba: the LBA
1456 * @plen: the transfer length
1457 */
1458 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1459 {
1460 u64 lba = 0;
1461 u32 len = 0;
1462
1463 VPRINTK("ten-byte command\n");
1464
1465 lba |= ((u64)cdb[2]) << 24;
1466 lba |= ((u64)cdb[3]) << 16;
1467 lba |= ((u64)cdb[4]) << 8;
1468 lba |= ((u64)cdb[5]);
1469
1470 len |= ((u32)cdb[7]) << 8;
1471 len |= ((u32)cdb[8]);
1472
1473 *plba = lba;
1474 *plen = len;
1475 }
1476
1477 /**
1478 * scsi_16_lba_len - Get LBA and transfer length
1479 * @cdb: SCSI command to translate
1480 *
1481 * Calculate LBA and transfer length for 16-byte commands.
1482 *
1483 * RETURNS:
1484 * @plba: the LBA
1485 * @plen: the transfer length
1486 */
1487 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1488 {
1489 u64 lba = 0;
1490 u32 len = 0;
1491
1492 VPRINTK("sixteen-byte command\n");
1493
1494 lba |= ((u64)cdb[2]) << 56;
1495 lba |= ((u64)cdb[3]) << 48;
1496 lba |= ((u64)cdb[4]) << 40;
1497 lba |= ((u64)cdb[5]) << 32;
1498 lba |= ((u64)cdb[6]) << 24;
1499 lba |= ((u64)cdb[7]) << 16;
1500 lba |= ((u64)cdb[8]) << 8;
1501 lba |= ((u64)cdb[9]);
1502
1503 len |= ((u32)cdb[10]) << 24;
1504 len |= ((u32)cdb[11]) << 16;
1505 len |= ((u32)cdb[12]) << 8;
1506 len |= ((u32)cdb[13]);
1507
1508 *plba = lba;
1509 *plen = len;
1510 }
1511
1512 /**
1513 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1514 * @qc: Storage for translated ATA taskfile
1515 *
1516 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1517 *
1518 * LOCKING:
1519 * spin_lock_irqsave(host lock)
1520 *
1521 * RETURNS:
1522 * Zero on success, non-zero on error.
1523 */
1524 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1525 {
1526 struct scsi_cmnd *scmd = qc->scsicmd;
1527 struct ata_taskfile *tf = &qc->tf;
1528 struct ata_device *dev = qc->dev;
1529 u64 dev_sectors = qc->dev->n_sectors;
1530 const u8 *cdb = scmd->cmnd;
1531 u64 block;
1532 u32 n_block;
1533
1534 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1535 tf->protocol = ATA_PROT_NODATA;
1536
1537 if (cdb[0] == VERIFY) {
1538 if (scmd->cmd_len < 10)
1539 goto invalid_fld;
1540 scsi_10_lba_len(cdb, &block, &n_block);
1541 } else if (cdb[0] == VERIFY_16) {
1542 if (scmd->cmd_len < 16)
1543 goto invalid_fld;
1544 scsi_16_lba_len(cdb, &block, &n_block);
1545 } else
1546 goto invalid_fld;
1547
1548 if (!n_block)
1549 goto nothing_to_do;
1550 if (block >= dev_sectors)
1551 goto out_of_range;
1552 if ((block + n_block) > dev_sectors)
1553 goto out_of_range;
1554
1555 if (dev->flags & ATA_DFLAG_LBA) {
1556 tf->flags |= ATA_TFLAG_LBA;
1557
1558 if (lba_28_ok(block, n_block)) {
1559 /* use LBA28 */
1560 tf->command = ATA_CMD_VERIFY;
1561 tf->device |= (block >> 24) & 0xf;
1562 } else if (lba_48_ok(block, n_block)) {
1563 if (!(dev->flags & ATA_DFLAG_LBA48))
1564 goto out_of_range;
1565
1566 /* use LBA48 */
1567 tf->flags |= ATA_TFLAG_LBA48;
1568 tf->command = ATA_CMD_VERIFY_EXT;
1569
1570 tf->hob_nsect = (n_block >> 8) & 0xff;
1571
1572 tf->hob_lbah = (block >> 40) & 0xff;
1573 tf->hob_lbam = (block >> 32) & 0xff;
1574 tf->hob_lbal = (block >> 24) & 0xff;
1575 } else
1576 /* request too large even for LBA48 */
1577 goto out_of_range;
1578
1579 tf->nsect = n_block & 0xff;
1580
1581 tf->lbah = (block >> 16) & 0xff;
1582 tf->lbam = (block >> 8) & 0xff;
1583 tf->lbal = block & 0xff;
1584
1585 tf->device |= ATA_LBA;
1586 } else {
1587 /* CHS */
1588 u32 sect, head, cyl, track;
1589
1590 if (!lba_28_ok(block, n_block))
1591 goto out_of_range;
1592
1593 /* Convert LBA to CHS */
1594 track = (u32)block / dev->sectors;
1595 cyl = track / dev->heads;
1596 head = track % dev->heads;
1597 sect = (u32)block % dev->sectors + 1;
1598
1599 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1600 (u32)block, track, cyl, head, sect);
1601
1602 /* Check whether the converted CHS can fit.
1603 Cylinder: 0-65535
1604 Head: 0-15
1605 Sector: 1-255*/
1606 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1607 goto out_of_range;
1608
1609 tf->command = ATA_CMD_VERIFY;
1610 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1611 tf->lbal = sect;
1612 tf->lbam = cyl;
1613 tf->lbah = cyl >> 8;
1614 tf->device |= head;
1615 }
1616
1617 return 0;
1618
1619 invalid_fld:
1620 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1621 /* "Invalid field in cbd" */
1622 return 1;
1623
1624 out_of_range:
1625 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1626 /* "Logical Block Address out of range" */
1627 return 1;
1628
1629 nothing_to_do:
1630 scmd->result = SAM_STAT_GOOD;
1631 return 1;
1632 }
1633
1634 /**
1635 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1636 * @qc: Storage for translated ATA taskfile
1637 *
1638 * Converts any of six SCSI read/write commands into the
1639 * ATA counterpart, including starting sector (LBA),
1640 * sector count, and taking into account the device's LBA48
1641 * support.
1642 *
1643 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1644 * %WRITE_16 are currently supported.
1645 *
1646 * LOCKING:
1647 * spin_lock_irqsave(host lock)
1648 *
1649 * RETURNS:
1650 * Zero on success, non-zero on error.
1651 */
1652 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1653 {
1654 struct scsi_cmnd *scmd = qc->scsicmd;
1655 const u8 *cdb = scmd->cmnd;
1656 unsigned int tf_flags = 0;
1657 u64 block;
1658 u32 n_block;
1659 int rc;
1660
1661 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1662 tf_flags |= ATA_TFLAG_WRITE;
1663
1664 /* Calculate the SCSI LBA, transfer length and FUA. */
1665 switch (cdb[0]) {
1666 case READ_10:
1667 case WRITE_10:
1668 if (unlikely(scmd->cmd_len < 10))
1669 goto invalid_fld;
1670 scsi_10_lba_len(cdb, &block, &n_block);
1671 if (unlikely(cdb[1] & (1 << 3)))
1672 tf_flags |= ATA_TFLAG_FUA;
1673 break;
1674 case READ_6:
1675 case WRITE_6:
1676 if (unlikely(scmd->cmd_len < 6))
1677 goto invalid_fld;
1678 scsi_6_lba_len(cdb, &block, &n_block);
1679
1680 /* for 6-byte r/w commands, transfer length 0
1681 * means 256 blocks of data, not 0 block.
1682 */
1683 if (!n_block)
1684 n_block = 256;
1685 break;
1686 case READ_16:
1687 case WRITE_16:
1688 if (unlikely(scmd->cmd_len < 16))
1689 goto invalid_fld;
1690 scsi_16_lba_len(cdb, &block, &n_block);
1691 if (unlikely(cdb[1] & (1 << 3)))
1692 tf_flags |= ATA_TFLAG_FUA;
1693 break;
1694 default:
1695 DPRINTK("no-byte command\n");
1696 goto invalid_fld;
1697 }
1698
1699 /* Check and compose ATA command */
1700 if (!n_block)
1701 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1702 * length 0 means transfer 0 block of data.
1703 * However, for ATA R/W commands, sector count 0 means
1704 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1705 *
1706 * WARNING: one or two older ATA drives treat 0 as 0...
1707 */
1708 goto nothing_to_do;
1709
1710 qc->flags |= ATA_QCFLAG_IO;
1711 qc->nbytes = n_block * ATA_SECT_SIZE;
1712
1713 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1714 qc->tag);
1715 if (likely(rc == 0))
1716 return 0;
1717
1718 if (rc == -ERANGE)
1719 goto out_of_range;
1720 /* treat all other errors as -EINVAL, fall through */
1721 invalid_fld:
1722 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1723 /* "Invalid field in cbd" */
1724 return 1;
1725
1726 out_of_range:
1727 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1728 /* "Logical Block Address out of range" */
1729 return 1;
1730
1731 nothing_to_do:
1732 scmd->result = SAM_STAT_GOOD;
1733 return 1;
1734 }
1735
1736 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1737 {
1738 struct ata_port *ap = qc->ap;
1739 struct scsi_cmnd *cmd = qc->scsicmd;
1740 u8 *cdb = cmd->cmnd;
1741 int need_sense = (qc->err_mask != 0);
1742
1743 /* For ATA pass thru (SAT) commands, generate a sense block if
1744 * user mandated it or if there's an error. Note that if we
1745 * generate because the user forced us to, a check condition
1746 * is generated and the ATA register values are returned
1747 * whether the command completed successfully or not. If there
1748 * was no error, SK, ASC and ASCQ will all be zero.
1749 */
1750 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1751 ((cdb[2] & 0x20) || need_sense)) {
1752 ata_gen_passthru_sense(qc);
1753 } else {
1754 if (!need_sense) {
1755 cmd->result = SAM_STAT_GOOD;
1756 } else {
1757 /* TODO: decide which descriptor format to use
1758 * for 48b LBA devices and call that here
1759 * instead of the fixed desc, which is only
1760 * good for smaller LBA (and maybe CHS?)
1761 * devices.
1762 */
1763 ata_gen_ata_sense(qc);
1764 }
1765 }
1766
1767 /* XXX: track spindown state for spindown skipping and warning */
1768 if (unlikely(qc->tf.command == ATA_CMD_STANDBY ||
1769 qc->tf.command == ATA_CMD_STANDBYNOW1))
1770 qc->dev->flags |= ATA_DFLAG_SPUNDOWN;
1771 else if (likely(system_state != SYSTEM_HALT &&
1772 system_state != SYSTEM_POWER_OFF))
1773 qc->dev->flags &= ~ATA_DFLAG_SPUNDOWN;
1774
1775 if (need_sense && !ap->ops->error_handler)
1776 ata_dump_status(ap->print_id, &qc->result_tf);
1777
1778 qc->scsidone(cmd);
1779
1780 ata_qc_free(qc);
1781 }
1782
1783 /**
1784 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1785 * @dev: ATA device to which the command is addressed
1786 * @cmd: SCSI command to execute
1787 * @done: SCSI command completion function
1788 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1789 *
1790 * Our ->queuecommand() function has decided that the SCSI
1791 * command issued can be directly translated into an ATA
1792 * command, rather than handled internally.
1793 *
1794 * This function sets up an ata_queued_cmd structure for the
1795 * SCSI command, and sends that ata_queued_cmd to the hardware.
1796 *
1797 * The xlat_func argument (actor) returns 0 if ready to execute
1798 * ATA command, else 1 to finish translation. If 1 is returned
1799 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1800 * to be set reflecting an error condition or clean (early)
1801 * termination.
1802 *
1803 * LOCKING:
1804 * spin_lock_irqsave(host lock)
1805 *
1806 * RETURNS:
1807 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1808 * needs to be deferred.
1809 */
1810 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1811 void (*done)(struct scsi_cmnd *),
1812 ata_xlat_func_t xlat_func)
1813 {
1814 struct ata_port *ap = dev->link->ap;
1815 struct ata_queued_cmd *qc;
1816 int rc;
1817
1818 VPRINTK("ENTER\n");
1819
1820 qc = ata_scsi_qc_new(dev, cmd, done);
1821 if (!qc)
1822 goto err_mem;
1823
1824 /* data is present; dma-map it */
1825 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1826 cmd->sc_data_direction == DMA_TO_DEVICE) {
1827 if (unlikely(scsi_bufflen(cmd) < 1)) {
1828 ata_dev_printk(dev, KERN_WARNING,
1829 "WARNING: zero len r/w req\n");
1830 goto err_did;
1831 }
1832
1833 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1834
1835 qc->dma_dir = cmd->sc_data_direction;
1836 }
1837
1838 qc->complete_fn = ata_scsi_qc_complete;
1839
1840 if (xlat_func(qc))
1841 goto early_finish;
1842
1843 if (ap->ops->qc_defer) {
1844 if ((rc = ap->ops->qc_defer(qc)))
1845 goto defer;
1846 }
1847
1848 /* select device, send command to hardware */
1849 ata_qc_issue(qc);
1850
1851 VPRINTK("EXIT\n");
1852 return 0;
1853
1854 early_finish:
1855 ata_qc_free(qc);
1856 qc->scsidone(cmd);
1857 DPRINTK("EXIT - early finish (good or error)\n");
1858 return 0;
1859
1860 err_did:
1861 ata_qc_free(qc);
1862 cmd->result = (DID_ERROR << 16);
1863 qc->scsidone(cmd);
1864 err_mem:
1865 DPRINTK("EXIT - internal\n");
1866 return 0;
1867
1868 defer:
1869 ata_qc_free(qc);
1870 DPRINTK("EXIT - defer\n");
1871 if (rc == ATA_DEFER_LINK)
1872 return SCSI_MLQUEUE_DEVICE_BUSY;
1873 else
1874 return SCSI_MLQUEUE_HOST_BUSY;
1875 }
1876
1877 /**
1878 * ata_scsi_rbuf_get - Map response buffer.
1879 * @cmd: SCSI command containing buffer to be mapped.
1880 * @flags: unsigned long variable to store irq enable status
1881 * @copy_in: copy in from user buffer
1882 *
1883 * Prepare buffer for simulated SCSI commands.
1884 *
1885 * LOCKING:
1886 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1887 *
1888 * RETURNS:
1889 * Pointer to response buffer.
1890 */
1891 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1892 unsigned long *flags)
1893 {
1894 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1895
1896 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1897 if (copy_in)
1898 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1899 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1900 return ata_scsi_rbuf;
1901 }
1902
1903 /**
1904 * ata_scsi_rbuf_put - Unmap response buffer.
1905 * @cmd: SCSI command containing buffer to be unmapped.
1906 * @copy_out: copy out result
1907 * @flags: @flags passed to ata_scsi_rbuf_get()
1908 *
1909 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1910 * @copy_back is true.
1911 *
1912 * LOCKING:
1913 * Unlocks ata_scsi_rbuf_lock.
1914 */
1915 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1916 unsigned long *flags)
1917 {
1918 if (copy_out)
1919 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1920 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1921 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1922 }
1923
1924 /**
1925 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1926 * @args: device IDENTIFY data / SCSI command of interest.
1927 * @actor: Callback hook for desired SCSI command simulator
1928 *
1929 * Takes care of the hard work of simulating a SCSI command...
1930 * Mapping the response buffer, calling the command's handler,
1931 * and handling the handler's return value. This return value
1932 * indicates whether the handler wishes the SCSI command to be
1933 * completed successfully (0), or not (in which case cmd->result
1934 * and sense buffer are assumed to be set).
1935 *
1936 * LOCKING:
1937 * spin_lock_irqsave(host lock)
1938 */
1939 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1940 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1941 {
1942 u8 *rbuf;
1943 unsigned int rc;
1944 struct scsi_cmnd *cmd = args->cmd;
1945 unsigned long flags;
1946
1947 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1948 rc = actor(args, rbuf);
1949 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
1950
1951 if (rc == 0)
1952 cmd->result = SAM_STAT_GOOD;
1953 args->done(cmd);
1954 }
1955
1956 /**
1957 * ata_scsiop_inq_std - Simulate INQUIRY command
1958 * @args: device IDENTIFY data / SCSI command of interest.
1959 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1960 *
1961 * Returns standard device identification data associated
1962 * with non-VPD INQUIRY command output.
1963 *
1964 * LOCKING:
1965 * spin_lock_irqsave(host lock)
1966 */
1967 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1968 {
1969 const u8 versions[] = {
1970 0x60, /* SAM-3 (no version claimed) */
1971
1972 0x03,
1973 0x20, /* SBC-2 (no version claimed) */
1974
1975 0x02,
1976 0x60 /* SPC-3 (no version claimed) */
1977 };
1978 u8 hdr[] = {
1979 TYPE_DISK,
1980 0,
1981 0x5, /* claim SPC-3 version compatibility */
1982 2,
1983 95 - 4
1984 };
1985
1986 VPRINTK("ENTER\n");
1987
1988 /* set scsi removeable (RMB) bit per ata bit */
1989 if (ata_id_removeable(args->id))
1990 hdr[1] |= (1 << 7);
1991
1992 memcpy(rbuf, hdr, sizeof(hdr));
1993 memcpy(&rbuf[8], "ATA ", 8);
1994 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1995 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1996
1997 if (rbuf[32] == 0 || rbuf[32] == ' ')
1998 memcpy(&rbuf[32], "n/a ", 4);
1999
2000 memcpy(rbuf + 59, versions, sizeof(versions));
2001
2002 return 0;
2003 }
2004
2005 /**
2006 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
2007 * @args: device IDENTIFY data / SCSI command of interest.
2008 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2009 *
2010 * Returns list of inquiry VPD pages available.
2011 *
2012 * LOCKING:
2013 * spin_lock_irqsave(host lock)
2014 */
2015 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
2016 {
2017 const u8 pages[] = {
2018 0x00, /* page 0x00, this page */
2019 0x80, /* page 0x80, unit serial no page */
2020 0x83, /* page 0x83, device ident page */
2021 0x89, /* page 0x89, ata info page */
2022 0xb1, /* page 0xb1, block device characteristics page */
2023 };
2024
2025 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
2026 memcpy(rbuf + 4, pages, sizeof(pages));
2027 return 0;
2028 }
2029
2030 /**
2031 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
2032 * @args: device IDENTIFY data / SCSI command of interest.
2033 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2034 *
2035 * Returns ATA device serial number.
2036 *
2037 * LOCKING:
2038 * spin_lock_irqsave(host lock)
2039 */
2040 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
2041 {
2042 const u8 hdr[] = {
2043 0,
2044 0x80, /* this page code */
2045 0,
2046 ATA_ID_SERNO_LEN, /* page len */
2047 };
2048
2049 memcpy(rbuf, hdr, sizeof(hdr));
2050 ata_id_string(args->id, (unsigned char *) &rbuf[4],
2051 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2052 return 0;
2053 }
2054
2055 /**
2056 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2057 * @args: device IDENTIFY data / SCSI command of interest.
2058 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2059 *
2060 * Yields two logical unit device identification designators:
2061 * - vendor specific ASCII containing the ATA serial number
2062 * - SAT defined "t10 vendor id based" containing ASCII vendor
2063 * name ("ATA "), model and serial numbers.
2064 *
2065 * LOCKING:
2066 * spin_lock_irqsave(host lock)
2067 */
2068 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
2069 {
2070 const int sat_model_serial_desc_len = 68;
2071 int num;
2072
2073 rbuf[1] = 0x83; /* this page code */
2074 num = 4;
2075
2076 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2077 rbuf[num + 0] = 2;
2078 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2079 num += 4;
2080 ata_id_string(args->id, (unsigned char *) rbuf + num,
2081 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2082 num += ATA_ID_SERNO_LEN;
2083
2084 /* SAT defined lu model and serial numbers descriptor */
2085 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2086 rbuf[num + 0] = 2;
2087 rbuf[num + 1] = 1;
2088 rbuf[num + 3] = sat_model_serial_desc_len;
2089 num += 4;
2090 memcpy(rbuf + num, "ATA ", 8);
2091 num += 8;
2092 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2093 ATA_ID_PROD_LEN);
2094 num += ATA_ID_PROD_LEN;
2095 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2096 ATA_ID_SERNO_LEN);
2097 num += ATA_ID_SERNO_LEN;
2098
2099 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
2100 return 0;
2101 }
2102
2103 /**
2104 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2105 * @args: device IDENTIFY data / SCSI command of interest.
2106 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2107 *
2108 * Yields SAT-specified ATA VPD page.
2109 *
2110 * LOCKING:
2111 * spin_lock_irqsave(host lock)
2112 */
2113 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
2114 {
2115 struct ata_taskfile tf;
2116
2117 memset(&tf, 0, sizeof(tf));
2118
2119 rbuf[1] = 0x89; /* our page code */
2120 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2121 rbuf[3] = (0x238 & 0xff);
2122
2123 memcpy(&rbuf[8], "linux ", 8);
2124 memcpy(&rbuf[16], "libata ", 16);
2125 memcpy(&rbuf[32], DRV_VERSION, 4);
2126 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
2127
2128 /* we don't store the ATA device signature, so we fake it */
2129
2130 tf.command = ATA_DRDY; /* really, this is Status reg */
2131 tf.lbal = 0x1;
2132 tf.nsect = 0x1;
2133
2134 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2135 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
2136
2137 rbuf[56] = ATA_CMD_ID_ATA;
2138
2139 memcpy(&rbuf[60], &args->id[0], 512);
2140 return 0;
2141 }
2142
2143 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2144 {
2145 int form_factor = ata_id_form_factor(args->id);
2146 int media_rotation_rate = ata_id_rotation_rate(args->id);
2147
2148 rbuf[1] = 0xb1;
2149 rbuf[3] = 0x3c;
2150 rbuf[4] = media_rotation_rate >> 8;
2151 rbuf[5] = media_rotation_rate;
2152 rbuf[7] = form_factor;
2153
2154 return 0;
2155 }
2156
2157 /**
2158 * ata_scsiop_noop - Command handler that simply returns success.
2159 * @args: device IDENTIFY data / SCSI command of interest.
2160 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2161 *
2162 * No operation. Simply returns success to caller, to indicate
2163 * that the caller should successfully complete this SCSI command.
2164 *
2165 * LOCKING:
2166 * spin_lock_irqsave(host lock)
2167 */
2168 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
2169 {
2170 VPRINTK("ENTER\n");
2171 return 0;
2172 }
2173
2174 /**
2175 * ata_msense_caching - Simulate MODE SENSE caching info page
2176 * @id: device IDENTIFY data
2177 * @buf: output buffer
2178 *
2179 * Generate a caching info page, which conditionally indicates
2180 * write caching to the SCSI layer, depending on device
2181 * capabilities.
2182 *
2183 * LOCKING:
2184 * None.
2185 */
2186 static unsigned int ata_msense_caching(u16 *id, u8 *buf)
2187 {
2188 memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage));
2189 if (ata_id_wcache_enabled(id))
2190 buf[2] |= (1 << 2); /* write cache enable */
2191 if (!ata_id_rahead_enabled(id))
2192 buf[12] |= (1 << 5); /* disable read ahead */
2193 return sizeof(def_cache_mpage);
2194 }
2195
2196 /**
2197 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2198 * @buf: output buffer
2199 *
2200 * Generate a generic MODE SENSE control mode page.
2201 *
2202 * LOCKING:
2203 * None.
2204 */
2205 static unsigned int ata_msense_ctl_mode(u8 *buf)
2206 {
2207 memcpy(buf, def_control_mpage, sizeof(def_control_mpage));
2208 return sizeof(def_control_mpage);
2209 }
2210
2211 /**
2212 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2213 * @buf: output buffer
2214 *
2215 * Generate a generic MODE SENSE r/w error recovery page.
2216 *
2217 * LOCKING:
2218 * None.
2219 */
2220 static unsigned int ata_msense_rw_recovery(u8 *buf)
2221 {
2222 memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage));
2223 return sizeof(def_rw_recovery_mpage);
2224 }
2225
2226 /*
2227 * We can turn this into a real blacklist if it's needed, for now just
2228 * blacklist any Maxtor BANC1G10 revision firmware
2229 */
2230 static int ata_dev_supports_fua(u16 *id)
2231 {
2232 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2233
2234 if (!libata_fua)
2235 return 0;
2236 if (!ata_id_has_fua(id))
2237 return 0;
2238
2239 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2240 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2241
2242 if (strcmp(model, "Maxtor"))
2243 return 1;
2244 if (strcmp(fw, "BANC1G10"))
2245 return 1;
2246
2247 return 0; /* blacklisted */
2248 }
2249
2250 /**
2251 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2252 * @args: device IDENTIFY data / SCSI command of interest.
2253 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2254 *
2255 * Simulate MODE SENSE commands. Assume this is invoked for direct
2256 * access devices (e.g. disks) only. There should be no block
2257 * descriptor for other device types.
2258 *
2259 * LOCKING:
2260 * spin_lock_irqsave(host lock)
2261 */
2262 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
2263 {
2264 struct ata_device *dev = args->dev;
2265 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
2266 const u8 sat_blk_desc[] = {
2267 0, 0, 0, 0, /* number of blocks: sat unspecified */
2268 0,
2269 0, 0x2, 0x0 /* block length: 512 bytes */
2270 };
2271 u8 pg, spg;
2272 unsigned int ebd, page_control, six_byte;
2273 u8 dpofua;
2274
2275 VPRINTK("ENTER\n");
2276
2277 six_byte = (scsicmd[0] == MODE_SENSE);
2278 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2279 /*
2280 * LLBA bit in msense(10) ignored (compliant)
2281 */
2282
2283 page_control = scsicmd[2] >> 6;
2284 switch (page_control) {
2285 case 0: /* current */
2286 break; /* supported */
2287 case 3: /* saved */
2288 goto saving_not_supp;
2289 case 1: /* changeable */
2290 case 2: /* defaults */
2291 default:
2292 goto invalid_fld;
2293 }
2294
2295 if (six_byte)
2296 p += 4 + (ebd ? 8 : 0);
2297 else
2298 p += 8 + (ebd ? 8 : 0);
2299
2300 pg = scsicmd[2] & 0x3f;
2301 spg = scsicmd[3];
2302 /*
2303 * No mode subpages supported (yet) but asking for _all_
2304 * subpages may be valid
2305 */
2306 if (spg && (spg != ALL_SUB_MPAGES))
2307 goto invalid_fld;
2308
2309 switch(pg) {
2310 case RW_RECOVERY_MPAGE:
2311 p += ata_msense_rw_recovery(p);
2312 break;
2313
2314 case CACHE_MPAGE:
2315 p += ata_msense_caching(args->id, p);
2316 break;
2317
2318 case CONTROL_MPAGE:
2319 p += ata_msense_ctl_mode(p);
2320 break;
2321
2322 case ALL_MPAGES:
2323 p += ata_msense_rw_recovery(p);
2324 p += ata_msense_caching(args->id, p);
2325 p += ata_msense_ctl_mode(p);
2326 break;
2327
2328 default: /* invalid page code */
2329 goto invalid_fld;
2330 }
2331
2332 dpofua = 0;
2333 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2334 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2335 dpofua = 1 << 4;
2336
2337 if (six_byte) {
2338 rbuf[0] = p - rbuf - 1;
2339 rbuf[2] |= dpofua;
2340 if (ebd) {
2341 rbuf[3] = sizeof(sat_blk_desc);
2342 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2343 }
2344 } else {
2345 unsigned int output_len = p - rbuf - 2;
2346
2347 rbuf[0] = output_len >> 8;
2348 rbuf[1] = output_len;
2349 rbuf[3] |= dpofua;
2350 if (ebd) {
2351 rbuf[7] = sizeof(sat_blk_desc);
2352 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2353 }
2354 }
2355 return 0;
2356
2357 invalid_fld:
2358 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2359 /* "Invalid field in cbd" */
2360 return 1;
2361
2362 saving_not_supp:
2363 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2364 /* "Saving parameters not supported" */
2365 return 1;
2366 }
2367
2368 /**
2369 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2370 * @args: device IDENTIFY data / SCSI command of interest.
2371 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2372 *
2373 * Simulate READ CAPACITY commands.
2374 *
2375 * LOCKING:
2376 * None.
2377 */
2378 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
2379 {
2380 struct ata_device *dev = args->dev;
2381 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
2382 u8 log_per_phys = 0;
2383 u16 lowest_aligned = 0;
2384 u16 word_106 = dev->id[106];
2385 u16 word_209 = dev->id[209];
2386
2387 if ((word_106 & 0xc000) == 0x4000) {
2388 /* Number and offset of logical sectors per physical sector */
2389 if (word_106 & (1 << 13))
2390 log_per_phys = word_106 & 0xf;
2391 if ((word_209 & 0xc000) == 0x4000) {
2392 u16 first = dev->id[209] & 0x3fff;
2393 if (first > 0)
2394 lowest_aligned = (1 << log_per_phys) - first;
2395 }
2396 }
2397
2398 VPRINTK("ENTER\n");
2399
2400 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2401 if (last_lba >= 0xffffffffULL)
2402 last_lba = 0xffffffff;
2403
2404 /* sector count, 32-bit */
2405 rbuf[0] = last_lba >> (8 * 3);
2406 rbuf[1] = last_lba >> (8 * 2);
2407 rbuf[2] = last_lba >> (8 * 1);
2408 rbuf[3] = last_lba;
2409
2410 /* sector size */
2411 rbuf[6] = ATA_SECT_SIZE >> 8;
2412 rbuf[7] = ATA_SECT_SIZE & 0xff;
2413 } else {
2414 /* sector count, 64-bit */
2415 rbuf[0] = last_lba >> (8 * 7);
2416 rbuf[1] = last_lba >> (8 * 6);
2417 rbuf[2] = last_lba >> (8 * 5);
2418 rbuf[3] = last_lba >> (8 * 4);
2419 rbuf[4] = last_lba >> (8 * 3);
2420 rbuf[5] = last_lba >> (8 * 2);
2421 rbuf[6] = last_lba >> (8 * 1);
2422 rbuf[7] = last_lba;
2423
2424 /* sector size */
2425 rbuf[10] = ATA_SECT_SIZE >> 8;
2426 rbuf[11] = ATA_SECT_SIZE & 0xff;
2427
2428 rbuf[12] = 0;
2429 rbuf[13] = log_per_phys;
2430 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2431 rbuf[15] = lowest_aligned;
2432 }
2433
2434 return 0;
2435 }
2436
2437 /**
2438 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2439 * @args: device IDENTIFY data / SCSI command of interest.
2440 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2441 *
2442 * Simulate REPORT LUNS command.
2443 *
2444 * LOCKING:
2445 * spin_lock_irqsave(host lock)
2446 */
2447 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
2448 {
2449 VPRINTK("ENTER\n");
2450 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2451
2452 return 0;
2453 }
2454
2455 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2456 {
2457 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2458 /* FIXME: not quite right; we don't want the
2459 * translation of taskfile registers into
2460 * a sense descriptors, since that's only
2461 * correct for ATA, not ATAPI
2462 */
2463 ata_gen_passthru_sense(qc);
2464 }
2465
2466 qc->scsidone(qc->scsicmd);
2467 ata_qc_free(qc);
2468 }
2469
2470 /* is it pointless to prefer PIO for "safety reasons"? */
2471 static inline int ata_pio_use_silly(struct ata_port *ap)
2472 {
2473 return (ap->flags & ATA_FLAG_PIO_DMA);
2474 }
2475
2476 static void atapi_request_sense(struct ata_queued_cmd *qc)
2477 {
2478 struct ata_port *ap = qc->ap;
2479 struct scsi_cmnd *cmd = qc->scsicmd;
2480
2481 DPRINTK("ATAPI request sense\n");
2482
2483 /* FIXME: is this needed? */
2484 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2485
2486 #ifdef CONFIG_ATA_SFF
2487 if (ap->ops->sff_tf_read)
2488 ap->ops->sff_tf_read(ap, &qc->tf);
2489 #endif
2490
2491 /* fill these in, for the case where they are -not- overwritten */
2492 cmd->sense_buffer[0] = 0x70;
2493 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2494
2495 ata_qc_reinit(qc);
2496
2497 /* setup sg table and init transfer direction */
2498 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2499 ata_sg_init(qc, &qc->sgent, 1);
2500 qc->dma_dir = DMA_FROM_DEVICE;
2501
2502 memset(&qc->cdb, 0, qc->dev->cdb_len);
2503 qc->cdb[0] = REQUEST_SENSE;
2504 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2505
2506 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2507 qc->tf.command = ATA_CMD_PACKET;
2508
2509 if (ata_pio_use_silly(ap)) {
2510 qc->tf.protocol = ATAPI_PROT_DMA;
2511 qc->tf.feature |= ATAPI_PKT_DMA;
2512 } else {
2513 qc->tf.protocol = ATAPI_PROT_PIO;
2514 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2515 qc->tf.lbah = 0;
2516 }
2517 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2518
2519 qc->complete_fn = atapi_sense_complete;
2520
2521 ata_qc_issue(qc);
2522
2523 DPRINTK("EXIT\n");
2524 }
2525
2526 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2527 {
2528 struct scsi_cmnd *cmd = qc->scsicmd;
2529 unsigned int err_mask = qc->err_mask;
2530
2531 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2532
2533 /* handle completion from new EH */
2534 if (unlikely(qc->ap->ops->error_handler &&
2535 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2536
2537 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2538 /* FIXME: not quite right; we don't want the
2539 * translation of taskfile registers into a
2540 * sense descriptors, since that's only
2541 * correct for ATA, not ATAPI
2542 */
2543 ata_gen_passthru_sense(qc);
2544 }
2545
2546 /* SCSI EH automatically locks door if sdev->locked is
2547 * set. Sometimes door lock request continues to
2548 * fail, for example, when no media is present. This
2549 * creates a loop - SCSI EH issues door lock which
2550 * fails and gets invoked again to acquire sense data
2551 * for the failed command.
2552 *
2553 * If door lock fails, always clear sdev->locked to
2554 * avoid this infinite loop.
2555 */
2556 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
2557 qc->dev->sdev->locked = 0;
2558
2559 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2560 qc->scsidone(cmd);
2561 ata_qc_free(qc);
2562 return;
2563 }
2564
2565 /* successful completion or old EH failure path */
2566 if (unlikely(err_mask & AC_ERR_DEV)) {
2567 cmd->result = SAM_STAT_CHECK_CONDITION;
2568 atapi_request_sense(qc);
2569 return;
2570 } else if (unlikely(err_mask)) {
2571 /* FIXME: not quite right; we don't want the
2572 * translation of taskfile registers into
2573 * a sense descriptors, since that's only
2574 * correct for ATA, not ATAPI
2575 */
2576 ata_gen_passthru_sense(qc);
2577 } else {
2578 u8 *scsicmd = cmd->cmnd;
2579
2580 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2581 unsigned long flags;
2582 u8 *buf;
2583
2584 buf = ata_scsi_rbuf_get(cmd, true, &flags);
2585
2586 /* ATAPI devices typically report zero for their SCSI version,
2587 * and sometimes deviate from the spec WRT response data
2588 * format. If SCSI version is reported as zero like normal,
2589 * then we make the following fixups: 1) Fake MMC-5 version,
2590 * to indicate to the Linux scsi midlayer this is a modern
2591 * device. 2) Ensure response data format / ATAPI information
2592 * are always correct.
2593 */
2594 if (buf[2] == 0) {
2595 buf[2] = 0x5;
2596 buf[3] = 0x32;
2597 }
2598
2599 ata_scsi_rbuf_put(cmd, true, &flags);
2600 }
2601
2602 cmd->result = SAM_STAT_GOOD;
2603 }
2604
2605 qc->scsidone(cmd);
2606 ata_qc_free(qc);
2607 }
2608 /**
2609 * atapi_xlat - Initialize PACKET taskfile
2610 * @qc: command structure to be initialized
2611 *
2612 * LOCKING:
2613 * spin_lock_irqsave(host lock)
2614 *
2615 * RETURNS:
2616 * Zero on success, non-zero on failure.
2617 */
2618 static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2619 {
2620 struct scsi_cmnd *scmd = qc->scsicmd;
2621 struct ata_device *dev = qc->dev;
2622 int nodata = (scmd->sc_data_direction == DMA_NONE);
2623 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2624 unsigned int nbytes;
2625
2626 memset(qc->cdb, 0, dev->cdb_len);
2627 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2628
2629 qc->complete_fn = atapi_qc_complete;
2630
2631 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2632 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2633 qc->tf.flags |= ATA_TFLAG_WRITE;
2634 DPRINTK("direction: write\n");
2635 }
2636
2637 qc->tf.command = ATA_CMD_PACKET;
2638 ata_qc_set_pc_nbytes(qc);
2639
2640 /* check whether ATAPI DMA is safe */
2641 if (!nodata && !using_pio && atapi_check_dma(qc))
2642 using_pio = 1;
2643
2644 /* Some controller variants snoop this value for Packet
2645 * transfers to do state machine and FIFO management. Thus we
2646 * want to set it properly, and for DMA where it is
2647 * effectively meaningless.
2648 */
2649 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2650
2651 /* Most ATAPI devices which honor transfer chunk size don't
2652 * behave according to the spec when odd chunk size which
2653 * matches the transfer length is specified. If the number of
2654 * bytes to transfer is 2n+1. According to the spec, what
2655 * should happen is to indicate that 2n+1 is going to be
2656 * transferred and transfer 2n+2 bytes where the last byte is
2657 * padding.
2658 *
2659 * In practice, this doesn't happen. ATAPI devices first
2660 * indicate and transfer 2n bytes and then indicate and
2661 * transfer 2 bytes where the last byte is padding.
2662 *
2663 * This inconsistency confuses several controllers which
2664 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2665 * These controllers use actual number of transferred bytes to
2666 * update DMA poitner and transfer of 4n+2 bytes make those
2667 * controller push DMA pointer by 4n+4 bytes because SATA data
2668 * FISes are aligned to 4 bytes. This causes data corruption
2669 * and buffer overrun.
2670 *
2671 * Always setting nbytes to even number solves this problem
2672 * because then ATAPI devices don't have to split data at 2n
2673 * boundaries.
2674 */
2675 if (nbytes & 0x1)
2676 nbytes++;
2677
2678 qc->tf.lbam = (nbytes & 0xFF);
2679 qc->tf.lbah = (nbytes >> 8);
2680
2681 if (nodata)
2682 qc->tf.protocol = ATAPI_PROT_NODATA;
2683 else if (using_pio)
2684 qc->tf.protocol = ATAPI_PROT_PIO;
2685 else {
2686 /* DMA data xfer */
2687 qc->tf.protocol = ATAPI_PROT_DMA;
2688 qc->tf.feature |= ATAPI_PKT_DMA;
2689
2690 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2691 (scmd->sc_data_direction != DMA_TO_DEVICE))
2692 /* some SATA bridges need us to indicate data xfer direction */
2693 qc->tf.feature |= ATAPI_DMADIR;
2694 }
2695
2696
2697 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2698 as ATAPI tape drives don't get this right otherwise */
2699 return 0;
2700 }
2701
2702 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2703 {
2704 if (!sata_pmp_attached(ap)) {
2705 if (likely(devno < ata_link_max_devices(&ap->link)))
2706 return &ap->link.device[devno];
2707 } else {
2708 if (likely(devno < ap->nr_pmp_links))
2709 return &ap->pmp_link[devno].device[0];
2710 }
2711
2712 return NULL;
2713 }
2714
2715 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2716 const struct scsi_device *scsidev)
2717 {
2718 int devno;
2719
2720 /* skip commands not addressed to targets we simulate */
2721 if (!sata_pmp_attached(ap)) {
2722 if (unlikely(scsidev->channel || scsidev->lun))
2723 return NULL;
2724 devno = scsidev->id;
2725 } else {
2726 if (unlikely(scsidev->id || scsidev->lun))
2727 return NULL;
2728 devno = scsidev->channel;
2729 }
2730
2731 return ata_find_dev(ap, devno);
2732 }
2733
2734 /**
2735 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2736 * @ap: ATA port to which the device is attached
2737 * @scsidev: SCSI device from which we derive the ATA device
2738 *
2739 * Given various information provided in struct scsi_cmnd,
2740 * map that onto an ATA bus, and using that mapping
2741 * determine which ata_device is associated with the
2742 * SCSI command to be sent.
2743 *
2744 * LOCKING:
2745 * spin_lock_irqsave(host lock)
2746 *
2747 * RETURNS:
2748 * Associated ATA device, or %NULL if not found.
2749 */
2750 static struct ata_device *
2751 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2752 {
2753 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2754
2755 if (unlikely(!dev || !ata_dev_enabled(dev)))
2756 return NULL;
2757
2758 return dev;
2759 }
2760
2761 /*
2762 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2763 * @byte1: Byte 1 from pass-thru CDB.
2764 *
2765 * RETURNS:
2766 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2767 */
2768 static u8
2769 ata_scsi_map_proto(u8 byte1)
2770 {
2771 switch((byte1 & 0x1e) >> 1) {
2772 case 3: /* Non-data */
2773 return ATA_PROT_NODATA;
2774
2775 case 6: /* DMA */
2776 case 10: /* UDMA Data-in */
2777 case 11: /* UDMA Data-Out */
2778 return ATA_PROT_DMA;
2779
2780 case 4: /* PIO Data-in */
2781 case 5: /* PIO Data-out */
2782 return ATA_PROT_PIO;
2783
2784 case 0: /* Hard Reset */
2785 case 1: /* SRST */
2786 case 8: /* Device Diagnostic */
2787 case 9: /* Device Reset */
2788 case 7: /* DMA Queued */
2789 case 12: /* FPDMA */
2790 case 15: /* Return Response Info */
2791 default: /* Reserved */
2792 break;
2793 }
2794
2795 return ATA_PROT_UNKNOWN;
2796 }
2797
2798 /**
2799 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2800 * @qc: command structure to be initialized
2801 *
2802 * Handles either 12 or 16-byte versions of the CDB.
2803 *
2804 * RETURNS:
2805 * Zero on success, non-zero on failure.
2806 */
2807 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2808 {
2809 struct ata_taskfile *tf = &(qc->tf);
2810 struct scsi_cmnd *scmd = qc->scsicmd;
2811 struct ata_device *dev = qc->dev;
2812 const u8 *cdb = scmd->cmnd;
2813
2814 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2815 goto invalid_fld;
2816
2817 /*
2818 * Filter TPM commands by default. These provide an
2819 * essentially uncontrolled encrypted "back door" between
2820 * applications and the disk. Set libata.allow_tpm=1 if you
2821 * have a real reason for wanting to use them. This ensures
2822 * that installed software cannot easily mess stuff up without
2823 * user intent. DVR type users will probably ship with this enabled
2824 * for movie content management.
2825 *
2826 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
2827 * for this and should do in future but that it is not sufficient as
2828 * DCS is an optional feature set. Thus we also do the software filter
2829 * so that we comply with the TC consortium stated goal that the user
2830 * can turn off TC features of their system.
2831 */
2832 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
2833 goto invalid_fld;
2834
2835 /* We may not issue DMA commands if no DMA mode is set */
2836 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2837 goto invalid_fld;
2838
2839 /*
2840 * 12 and 16 byte CDBs use different offsets to
2841 * provide the various register values.
2842 */
2843 if (cdb[0] == ATA_16) {
2844 /*
2845 * 16-byte CDB - may contain extended commands.
2846 *
2847 * If that is the case, copy the upper byte register values.
2848 */
2849 if (cdb[1] & 0x01) {
2850 tf->hob_feature = cdb[3];
2851 tf->hob_nsect = cdb[5];
2852 tf->hob_lbal = cdb[7];
2853 tf->hob_lbam = cdb[9];
2854 tf->hob_lbah = cdb[11];
2855 tf->flags |= ATA_TFLAG_LBA48;
2856 } else
2857 tf->flags &= ~ATA_TFLAG_LBA48;
2858
2859 /*
2860 * Always copy low byte, device and command registers.
2861 */
2862 tf->feature = cdb[4];
2863 tf->nsect = cdb[6];
2864 tf->lbal = cdb[8];
2865 tf->lbam = cdb[10];
2866 tf->lbah = cdb[12];
2867 tf->device = cdb[13];
2868 tf->command = cdb[14];
2869 } else {
2870 /*
2871 * 12-byte CDB - incapable of extended commands.
2872 */
2873 tf->flags &= ~ATA_TFLAG_LBA48;
2874
2875 tf->feature = cdb[3];
2876 tf->nsect = cdb[4];
2877 tf->lbal = cdb[5];
2878 tf->lbam = cdb[6];
2879 tf->lbah = cdb[7];
2880 tf->device = cdb[8];
2881 tf->command = cdb[9];
2882 }
2883
2884 /* enforce correct master/slave bit */
2885 tf->device = dev->devno ?
2886 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2887
2888 /* sanity check for pio multi commands */
2889 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
2890 goto invalid_fld;
2891
2892 if (is_multi_taskfile(tf)) {
2893 unsigned int multi_count = 1 << (cdb[1] >> 5);
2894
2895 /* compare the passed through multi_count
2896 * with the cached multi_count of libata
2897 */
2898 if (multi_count != dev->multi_count)
2899 ata_dev_printk(dev, KERN_WARNING,
2900 "invalid multi_count %u ignored\n",
2901 multi_count);
2902 }
2903
2904 /* READ/WRITE LONG use a non-standard sect_size */
2905 qc->sect_size = ATA_SECT_SIZE;
2906 switch (tf->command) {
2907 case ATA_CMD_READ_LONG:
2908 case ATA_CMD_READ_LONG_ONCE:
2909 case ATA_CMD_WRITE_LONG:
2910 case ATA_CMD_WRITE_LONG_ONCE:
2911 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2912 goto invalid_fld;
2913 qc->sect_size = scsi_bufflen(scmd);
2914 }
2915
2916 /*
2917 * Filter SET_FEATURES - XFER MODE command -- otherwise,
2918 * SET_FEATURES - XFER MODE must be preceded/succeeded
2919 * by an update to hardware-specific registers for each
2920 * controller (i.e. the reason for ->set_piomode(),
2921 * ->set_dmamode(), and ->post_set_mode() hooks).
2922 */
2923 if ((tf->command == ATA_CMD_SET_FEATURES)
2924 && (tf->feature == SETFEATURES_XFER))
2925 goto invalid_fld;
2926
2927 /*
2928 * Set flags so that all registers will be written,
2929 * and pass on write indication (used for PIO/DMA
2930 * setup.)
2931 */
2932 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
2933
2934 if (scmd->sc_data_direction == DMA_TO_DEVICE)
2935 tf->flags |= ATA_TFLAG_WRITE;
2936
2937 /*
2938 * Set transfer length.
2939 *
2940 * TODO: find out if we need to do more here to
2941 * cover scatter/gather case.
2942 */
2943 ata_qc_set_pc_nbytes(qc);
2944
2945 /* request result TF and be quiet about device error */
2946 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
2947
2948 return 0;
2949
2950 invalid_fld:
2951 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
2952 /* "Invalid field in cdb" */
2953 return 1;
2954 }
2955
2956 /**
2957 * ata_get_xlat_func - check if SCSI to ATA translation is possible
2958 * @dev: ATA device
2959 * @cmd: SCSI command opcode to consider
2960 *
2961 * Look up the SCSI command given, and determine whether the
2962 * SCSI command is to be translated or simulated.
2963 *
2964 * RETURNS:
2965 * Pointer to translation function if possible, %NULL if not.
2966 */
2967
2968 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
2969 {
2970 switch (cmd) {
2971 case READ_6:
2972 case READ_10:
2973 case READ_16:
2974
2975 case WRITE_6:
2976 case WRITE_10:
2977 case WRITE_16:
2978 return ata_scsi_rw_xlat;
2979
2980 case SYNCHRONIZE_CACHE:
2981 if (ata_try_flush_cache(dev))
2982 return ata_scsi_flush_xlat;
2983 break;
2984
2985 case VERIFY:
2986 case VERIFY_16:
2987 return ata_scsi_verify_xlat;
2988
2989 case ATA_12:
2990 case ATA_16:
2991 return ata_scsi_pass_thru;
2992
2993 case START_STOP:
2994 return ata_scsi_start_stop_xlat;
2995 }
2996
2997 return NULL;
2998 }
2999
3000 /**
3001 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3002 * @ap: ATA port to which the command was being sent
3003 * @cmd: SCSI command to dump
3004 *
3005 * Prints the contents of a SCSI command via printk().
3006 */
3007
3008 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
3009 struct scsi_cmnd *cmd)
3010 {
3011 #ifdef ATA_DEBUG
3012 struct scsi_device *scsidev = cmd->device;
3013 u8 *scsicmd = cmd->cmnd;
3014
3015 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
3016 ap->print_id,
3017 scsidev->channel, scsidev->id, scsidev->lun,
3018 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
3019 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
3020 scsicmd[8]);
3021 #endif
3022 }
3023
3024 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
3025 void (*done)(struct scsi_cmnd *),
3026 struct ata_device *dev)
3027 {
3028 u8 scsi_op = scmd->cmnd[0];
3029 ata_xlat_func_t xlat_func;
3030 int rc = 0;
3031
3032 if (dev->class == ATA_DEV_ATA) {
3033 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
3034 goto bad_cdb_len;
3035
3036 xlat_func = ata_get_xlat_func(dev, scsi_op);
3037 } else {
3038 if (unlikely(!scmd->cmd_len))
3039 goto bad_cdb_len;
3040
3041 xlat_func = NULL;
3042 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
3043 /* relay SCSI command to ATAPI device */
3044 int len = COMMAND_SIZE(scsi_op);
3045 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
3046 goto bad_cdb_len;
3047
3048 xlat_func = atapi_xlat;
3049 } else {
3050 /* ATA_16 passthru, treat as an ATA command */
3051 if (unlikely(scmd->cmd_len > 16))
3052 goto bad_cdb_len;
3053
3054 xlat_func = ata_get_xlat_func(dev, scsi_op);
3055 }
3056 }
3057
3058 if (xlat_func)
3059 rc = ata_scsi_translate(dev, scmd, done, xlat_func);
3060 else
3061 ata_scsi_simulate(dev, scmd, done);
3062
3063 return rc;
3064
3065 bad_cdb_len:
3066 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3067 scmd->cmd_len, scsi_op, dev->cdb_len);
3068 scmd->result = DID_ERROR << 16;
3069 done(scmd);
3070 return 0;
3071 }
3072
3073 /**
3074 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3075 * @cmd: SCSI command to be sent
3076 * @done: Completion function, called when command is complete
3077 *
3078 * In some cases, this function translates SCSI commands into
3079 * ATA taskfiles, and queues the taskfiles to be sent to
3080 * hardware. In other cases, this function simulates a
3081 * SCSI device by evaluating and responding to certain
3082 * SCSI commands. This creates the overall effect of
3083 * ATA and ATAPI devices appearing as SCSI devices.
3084 *
3085 * LOCKING:
3086 * Releases scsi-layer-held lock, and obtains host lock.
3087 *
3088 * RETURNS:
3089 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3090 * 0 otherwise.
3091 */
3092 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
3093 {
3094 struct ata_port *ap;
3095 struct ata_device *dev;
3096 struct scsi_device *scsidev = cmd->device;
3097 struct Scsi_Host *shost = scsidev->host;
3098 int rc = 0;
3099
3100 ap = ata_shost_to_port(shost);
3101
3102 spin_unlock(shost->host_lock);
3103 spin_lock(ap->lock);
3104
3105 ata_scsi_dump_cdb(ap, cmd);
3106
3107 dev = ata_scsi_find_dev(ap, scsidev);
3108 if (likely(dev))
3109 rc = __ata_scsi_queuecmd(cmd, done, dev);
3110 else {
3111 cmd->result = (DID_BAD_TARGET << 16);
3112 done(cmd);
3113 }
3114
3115 spin_unlock(ap->lock);
3116 spin_lock(shost->host_lock);
3117 return rc;
3118 }
3119
3120 /**
3121 * ata_scsi_simulate - simulate SCSI command on ATA device
3122 * @dev: the target device
3123 * @cmd: SCSI command being sent to device.
3124 * @done: SCSI command completion function.
3125 *
3126 * Interprets and directly executes a select list of SCSI commands
3127 * that can be handled internally.
3128 *
3129 * LOCKING:
3130 * spin_lock_irqsave(host lock)
3131 */
3132
3133 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
3134 void (*done)(struct scsi_cmnd *))
3135 {
3136 struct ata_scsi_args args;
3137 const u8 *scsicmd = cmd->cmnd;
3138 u8 tmp8;
3139
3140 args.dev = dev;
3141 args.id = dev->id;
3142 args.cmd = cmd;
3143 args.done = done;
3144
3145 switch(scsicmd[0]) {
3146 /* TODO: worth improving? */
3147 case FORMAT_UNIT:
3148 ata_scsi_invalid_field(cmd, done);
3149 break;
3150
3151 case INQUIRY:
3152 if (scsicmd[1] & 2) /* is CmdDt set? */
3153 ata_scsi_invalid_field(cmd, done);
3154 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3155 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3156 else switch (scsicmd[2]) {
3157 case 0x00:
3158 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3159 break;
3160 case 0x80:
3161 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3162 break;
3163 case 0x83:
3164 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3165 break;
3166 case 0x89:
3167 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3168 break;
3169 case 0xb1:
3170 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3171 break;
3172 default:
3173 ata_scsi_invalid_field(cmd, done);
3174 break;
3175 }
3176 break;
3177
3178 case MODE_SENSE:
3179 case MODE_SENSE_10:
3180 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3181 break;
3182
3183 case MODE_SELECT: /* unconditionally return */
3184 case MODE_SELECT_10: /* bad-field-in-cdb */
3185 ata_scsi_invalid_field(cmd, done);
3186 break;
3187
3188 case READ_CAPACITY:
3189 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3190 break;
3191
3192 case SERVICE_ACTION_IN:
3193 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3194 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3195 else
3196 ata_scsi_invalid_field(cmd, done);
3197 break;
3198
3199 case REPORT_LUNS:
3200 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3201 break;
3202
3203 case REQUEST_SENSE:
3204 ata_scsi_set_sense(cmd, 0, 0, 0);
3205 cmd->result = (DRIVER_SENSE << 24);
3206 done(cmd);
3207 break;
3208
3209 /* if we reach this, then writeback caching is disabled,
3210 * turning this into a no-op.
3211 */
3212 case SYNCHRONIZE_CACHE:
3213 /* fall through */
3214
3215 /* no-op's, complete with success */
3216 case REZERO_UNIT:
3217 case SEEK_6:
3218 case SEEK_10:
3219 case TEST_UNIT_READY:
3220 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3221 break;
3222
3223 case SEND_DIAGNOSTIC:
3224 tmp8 = scsicmd[1] & ~(1 << 3);
3225 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3226 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3227 else
3228 ata_scsi_invalid_field(cmd, done);
3229 break;
3230
3231 /* all other commands */
3232 default:
3233 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3234 /* "Invalid command operation code" */
3235 done(cmd);
3236 break;
3237 }
3238 }
3239
3240 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3241 {
3242 int i, rc;
3243
3244 for (i = 0; i < host->n_ports; i++) {
3245 struct ata_port *ap = host->ports[i];
3246 struct Scsi_Host *shost;
3247
3248 rc = -ENOMEM;
3249 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3250 if (!shost)
3251 goto err_alloc;
3252
3253 *(struct ata_port **)&shost->hostdata[0] = ap;
3254 ap->scsi_host = shost;
3255
3256 shost->transportt = &ata_scsi_transport_template;
3257 shost->unique_id = ap->print_id;
3258 shost->max_id = 16;
3259 shost->max_lun = 1;
3260 shost->max_channel = 1;
3261 shost->max_cmd_len = 16;
3262
3263 /* Schedule policy is determined by ->qc_defer()
3264 * callback and it needs to see every deferred qc.
3265 * Set host_blocked to 1 to prevent SCSI midlayer from
3266 * automatically deferring requests.
3267 */
3268 shost->max_host_blocked = 1;
3269
3270 rc = scsi_add_host(ap->scsi_host, ap->host->dev);
3271 if (rc)
3272 goto err_add;
3273 }
3274
3275 return 0;
3276
3277 err_add:
3278 scsi_host_put(host->ports[i]->scsi_host);
3279 err_alloc:
3280 while (--i >= 0) {
3281 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3282
3283 scsi_remove_host(shost);
3284 scsi_host_put(shost);
3285 }
3286 return rc;
3287 }
3288
3289 void ata_scsi_scan_host(struct ata_port *ap, int sync)
3290 {
3291 int tries = 5;
3292 struct ata_device *last_failed_dev = NULL;
3293 struct ata_link *link;
3294 struct ata_device *dev;
3295
3296 if (ap->flags & ATA_FLAG_DISABLED)
3297 return;
3298
3299 repeat:
3300 ata_for_each_link(link, ap, EDGE) {
3301 ata_for_each_dev(dev, link, ENABLED) {
3302 struct scsi_device *sdev;
3303 int channel = 0, id = 0;
3304
3305 if (dev->sdev)
3306 continue;
3307
3308 if (ata_is_host_link(link))
3309 id = dev->devno;
3310 else
3311 channel = link->pmp;
3312
3313 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3314 NULL);
3315 if (!IS_ERR(sdev)) {
3316 dev->sdev = sdev;
3317 scsi_device_put(sdev);
3318 }
3319 }
3320 }
3321
3322 /* If we scanned while EH was in progress or allocation
3323 * failure occurred, scan would have failed silently. Check
3324 * whether all devices are attached.
3325 */
3326 ata_for_each_link(link, ap, EDGE) {
3327 ata_for_each_dev(dev, link, ENABLED) {
3328 if (!dev->sdev)
3329 goto exit_loop;
3330 }
3331 }
3332 exit_loop:
3333 if (!link)
3334 return;
3335
3336 /* we're missing some SCSI devices */
3337 if (sync) {
3338 /* If caller requested synchrnous scan && we've made
3339 * any progress, sleep briefly and repeat.
3340 */
3341 if (dev != last_failed_dev) {
3342 msleep(100);
3343 last_failed_dev = dev;
3344 goto repeat;
3345 }
3346
3347 /* We might be failing to detect boot device, give it
3348 * a few more chances.
3349 */
3350 if (--tries) {
3351 msleep(100);
3352 goto repeat;
3353 }
3354
3355 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan "
3356 "failed without making any progress,\n"
3357 " switching to async\n");
3358 }
3359
3360 queue_delayed_work(ata_aux_wq, &ap->hotplug_task,
3361 round_jiffies_relative(HZ));
3362 }
3363
3364 /**
3365 * ata_scsi_offline_dev - offline attached SCSI device
3366 * @dev: ATA device to offline attached SCSI device for
3367 *
3368 * This function is called from ata_eh_hotplug() and responsible
3369 * for taking the SCSI device attached to @dev offline. This
3370 * function is called with host lock which protects dev->sdev
3371 * against clearing.
3372 *
3373 * LOCKING:
3374 * spin_lock_irqsave(host lock)
3375 *
3376 * RETURNS:
3377 * 1 if attached SCSI device exists, 0 otherwise.
3378 */
3379 int ata_scsi_offline_dev(struct ata_device *dev)
3380 {
3381 if (dev->sdev) {
3382 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3383 return 1;
3384 }
3385 return 0;
3386 }
3387
3388 /**
3389 * ata_scsi_remove_dev - remove attached SCSI device
3390 * @dev: ATA device to remove attached SCSI device for
3391 *
3392 * This function is called from ata_eh_scsi_hotplug() and
3393 * responsible for removing the SCSI device attached to @dev.
3394 *
3395 * LOCKING:
3396 * Kernel thread context (may sleep).
3397 */
3398 static void ata_scsi_remove_dev(struct ata_device *dev)
3399 {
3400 struct ata_port *ap = dev->link->ap;
3401 struct scsi_device *sdev;
3402 unsigned long flags;
3403
3404 /* Alas, we need to grab scan_mutex to ensure SCSI device
3405 * state doesn't change underneath us and thus
3406 * scsi_device_get() always succeeds. The mutex locking can
3407 * be removed if there is __scsi_device_get() interface which
3408 * increments reference counts regardless of device state.
3409 */
3410 mutex_lock(&ap->scsi_host->scan_mutex);
3411 spin_lock_irqsave(ap->lock, flags);
3412
3413 /* clearing dev->sdev is protected by host lock */
3414 sdev = dev->sdev;
3415 dev->sdev = NULL;
3416
3417 if (sdev) {
3418 /* If user initiated unplug races with us, sdev can go
3419 * away underneath us after the host lock and
3420 * scan_mutex are released. Hold onto it.
3421 */
3422 if (scsi_device_get(sdev) == 0) {
3423 /* The following ensures the attached sdev is
3424 * offline on return from ata_scsi_offline_dev()
3425 * regardless it wins or loses the race
3426 * against this function.
3427 */
3428 scsi_device_set_state(sdev, SDEV_OFFLINE);
3429 } else {
3430 WARN_ON(1);
3431 sdev = NULL;
3432 }
3433 }
3434
3435 spin_unlock_irqrestore(ap->lock, flags);
3436 mutex_unlock(&ap->scsi_host->scan_mutex);
3437
3438 if (sdev) {
3439 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
3440 dev_name(&sdev->sdev_gendev));
3441
3442 scsi_remove_device(sdev);
3443 scsi_device_put(sdev);
3444 }
3445 }
3446
3447 static void ata_scsi_handle_link_detach(struct ata_link *link)
3448 {
3449 struct ata_port *ap = link->ap;
3450 struct ata_device *dev;
3451
3452 ata_for_each_dev(dev, link, ALL) {
3453 unsigned long flags;
3454
3455 if (!(dev->flags & ATA_DFLAG_DETACHED))
3456 continue;
3457
3458 spin_lock_irqsave(ap->lock, flags);
3459 dev->flags &= ~ATA_DFLAG_DETACHED;
3460 spin_unlock_irqrestore(ap->lock, flags);
3461
3462 ata_scsi_remove_dev(dev);
3463 }
3464 }
3465
3466 /**
3467 * ata_scsi_media_change_notify - send media change event
3468 * @dev: Pointer to the disk device with media change event
3469 *
3470 * Tell the block layer to send a media change notification
3471 * event.
3472 *
3473 * LOCKING:
3474 * spin_lock_irqsave(host lock)
3475 */
3476 void ata_scsi_media_change_notify(struct ata_device *dev)
3477 {
3478 if (dev->sdev)
3479 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3480 GFP_ATOMIC);
3481 }
3482
3483 /**
3484 * ata_scsi_hotplug - SCSI part of hotplug
3485 * @work: Pointer to ATA port to perform SCSI hotplug on
3486 *
3487 * Perform SCSI part of hotplug. It's executed from a separate
3488 * workqueue after EH completes. This is necessary because SCSI
3489 * hot plugging requires working EH and hot unplugging is
3490 * synchronized with hot plugging with a mutex.
3491 *
3492 * LOCKING:
3493 * Kernel thread context (may sleep).
3494 */
3495 void ata_scsi_hotplug(struct work_struct *work)
3496 {
3497 struct ata_port *ap =
3498 container_of(work, struct ata_port, hotplug_task.work);
3499 int i;
3500
3501 if (ap->pflags & ATA_PFLAG_UNLOADING) {
3502 DPRINTK("ENTER/EXIT - unloading\n");
3503 return;
3504 }
3505
3506 DPRINTK("ENTER\n");
3507
3508 /* Unplug detached devices. We cannot use link iterator here
3509 * because PMP links have to be scanned even if PMP is
3510 * currently not attached. Iterate manually.
3511 */
3512 ata_scsi_handle_link_detach(&ap->link);
3513 if (ap->pmp_link)
3514 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3515 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3516
3517 /* scan for new ones */
3518 ata_scsi_scan_host(ap, 0);
3519
3520 DPRINTK("EXIT\n");
3521 }
3522
3523 /**
3524 * ata_scsi_user_scan - indication for user-initiated bus scan
3525 * @shost: SCSI host to scan
3526 * @channel: Channel to scan
3527 * @id: ID to scan
3528 * @lun: LUN to scan
3529 *
3530 * This function is called when user explicitly requests bus
3531 * scan. Set probe pending flag and invoke EH.
3532 *
3533 * LOCKING:
3534 * SCSI layer (we don't care)
3535 *
3536 * RETURNS:
3537 * Zero.
3538 */
3539 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3540 unsigned int id, unsigned int lun)
3541 {
3542 struct ata_port *ap = ata_shost_to_port(shost);
3543 unsigned long flags;
3544 int devno, rc = 0;
3545
3546 if (!ap->ops->error_handler)
3547 return -EOPNOTSUPP;
3548
3549 if (lun != SCAN_WILD_CARD && lun)
3550 return -EINVAL;
3551
3552 if (!sata_pmp_attached(ap)) {
3553 if (channel != SCAN_WILD_CARD && channel)
3554 return -EINVAL;
3555 devno = id;
3556 } else {
3557 if (id != SCAN_WILD_CARD && id)
3558 return -EINVAL;
3559 devno = channel;
3560 }
3561
3562 spin_lock_irqsave(ap->lock, flags);
3563
3564 if (devno == SCAN_WILD_CARD) {
3565 struct ata_link *link;
3566
3567 ata_for_each_link(link, ap, EDGE) {
3568 struct ata_eh_info *ehi = &link->eh_info;
3569 ehi->probe_mask |= ATA_ALL_DEVICES;
3570 ehi->action |= ATA_EH_RESET;
3571 }
3572 } else {
3573 struct ata_device *dev = ata_find_dev(ap, devno);
3574
3575 if (dev) {
3576 struct ata_eh_info *ehi = &dev->link->eh_info;
3577 ehi->probe_mask |= 1 << dev->devno;
3578 ehi->action |= ATA_EH_RESET;
3579 } else
3580 rc = -EINVAL;
3581 }
3582
3583 if (rc == 0) {
3584 ata_port_schedule_eh(ap);
3585 spin_unlock_irqrestore(ap->lock, flags);
3586 ata_port_wait_eh(ap);
3587 } else
3588 spin_unlock_irqrestore(ap->lock, flags);
3589
3590 return rc;
3591 }
3592
3593 /**
3594 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3595 * @work: Pointer to ATA port to perform scsi_rescan_device()
3596 *
3597 * After ATA pass thru (SAT) commands are executed successfully,
3598 * libata need to propagate the changes to SCSI layer. This
3599 * function must be executed from ata_aux_wq such that sdev
3600 * attach/detach don't race with rescan.
3601 *
3602 * LOCKING:
3603 * Kernel thread context (may sleep).
3604 */
3605 void ata_scsi_dev_rescan(struct work_struct *work)
3606 {
3607 struct ata_port *ap =
3608 container_of(work, struct ata_port, scsi_rescan_task);
3609 struct ata_link *link;
3610 struct ata_device *dev;
3611 unsigned long flags;
3612
3613 spin_lock_irqsave(ap->lock, flags);
3614
3615 ata_for_each_link(link, ap, EDGE) {
3616 ata_for_each_dev(dev, link, ENABLED) {
3617 struct scsi_device *sdev = dev->sdev;
3618
3619 if (!sdev)
3620 continue;
3621 if (scsi_device_get(sdev))
3622 continue;
3623
3624 spin_unlock_irqrestore(ap->lock, flags);
3625 scsi_rescan_device(&(sdev->sdev_gendev));
3626 scsi_device_put(sdev);
3627 spin_lock_irqsave(ap->lock, flags);
3628 }
3629 }
3630
3631 spin_unlock_irqrestore(ap->lock, flags);
3632 }
3633
3634 /**
3635 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3636 * @host: ATA host container for all SAS ports
3637 * @port_info: Information from low-level host driver
3638 * @shost: SCSI host that the scsi device is attached to
3639 *
3640 * LOCKING:
3641 * PCI/etc. bus probe sem.
3642 *
3643 * RETURNS:
3644 * ata_port pointer on success / NULL on failure.
3645 */
3646
3647 struct ata_port *ata_sas_port_alloc(struct ata_host *host,
3648 struct ata_port_info *port_info,
3649 struct Scsi_Host *shost)
3650 {
3651 struct ata_port *ap;
3652
3653 ap = ata_port_alloc(host);
3654 if (!ap)
3655 return NULL;
3656
3657 ap->port_no = 0;
3658 ap->lock = shost->host_lock;
3659 ap->pio_mask = port_info->pio_mask;
3660 ap->mwdma_mask = port_info->mwdma_mask;
3661 ap->udma_mask = port_info->udma_mask;
3662 ap->flags |= port_info->flags;
3663 ap->ops = port_info->port_ops;
3664 ap->cbl = ATA_CBL_SATA;
3665
3666 return ap;
3667 }
3668 EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3669
3670 /**
3671 * ata_sas_port_start - Set port up for dma.
3672 * @ap: Port to initialize
3673 *
3674 * Called just after data structures for each port are
3675 * initialized.
3676 *
3677 * May be used as the port_start() entry in ata_port_operations.
3678 *
3679 * LOCKING:
3680 * Inherited from caller.
3681 */
3682 int ata_sas_port_start(struct ata_port *ap)
3683 {
3684 return 0;
3685 }
3686 EXPORT_SYMBOL_GPL(ata_sas_port_start);
3687
3688 /**
3689 * ata_port_stop - Undo ata_sas_port_start()
3690 * @ap: Port to shut down
3691 *
3692 * May be used as the port_stop() entry in ata_port_operations.
3693 *
3694 * LOCKING:
3695 * Inherited from caller.
3696 */
3697
3698 void ata_sas_port_stop(struct ata_port *ap)
3699 {
3700 }
3701 EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3702
3703 /**
3704 * ata_sas_port_init - Initialize a SATA device
3705 * @ap: SATA port to initialize
3706 *
3707 * LOCKING:
3708 * PCI/etc. bus probe sem.
3709 *
3710 * RETURNS:
3711 * Zero on success, non-zero on error.
3712 */
3713
3714 int ata_sas_port_init(struct ata_port *ap)
3715 {
3716 int rc = ap->ops->port_start(ap);
3717
3718 if (!rc) {
3719 ap->print_id = ata_print_id++;
3720 rc = ata_bus_probe(ap);
3721 }
3722
3723 return rc;
3724 }
3725 EXPORT_SYMBOL_GPL(ata_sas_port_init);
3726
3727 /**
3728 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3729 * @ap: SATA port to destroy
3730 *
3731 */
3732
3733 void ata_sas_port_destroy(struct ata_port *ap)
3734 {
3735 if (ap->ops->port_stop)
3736 ap->ops->port_stop(ap);
3737 kfree(ap);
3738 }
3739 EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3740
3741 /**
3742 * ata_sas_slave_configure - Default slave_config routine for libata devices
3743 * @sdev: SCSI device to configure
3744 * @ap: ATA port to which SCSI device is attached
3745 *
3746 * RETURNS:
3747 * Zero.
3748 */
3749
3750 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
3751 {
3752 ata_scsi_sdev_config(sdev);
3753 ata_scsi_dev_config(sdev, ap->link.device);
3754 return 0;
3755 }
3756 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3757
3758 /**
3759 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3760 * @cmd: SCSI command to be sent
3761 * @done: Completion function, called when command is complete
3762 * @ap: ATA port to which the command is being sent
3763 *
3764 * RETURNS:
3765 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3766 * 0 otherwise.
3767 */
3768
3769 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
3770 struct ata_port *ap)
3771 {
3772 int rc = 0;
3773
3774 ata_scsi_dump_cdb(ap, cmd);
3775
3776 if (likely(ata_dev_enabled(ap->link.device)))
3777 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device);
3778 else {
3779 cmd->result = (DID_BAD_TARGET << 16);
3780 done(cmd);
3781 }
3782 return rc;
3783 }
3784 EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
Support for the Chinese Samsung S3C2440 based development boards