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On Tue, Nov 06, 2007 at 02:33:53AM -0800, akpm@linux-foundation.org wrote:
[mmotm.git] / drivers / ata / libata-scsi.c
blobb4ee28dec5218b19db9682e729458e4d6b30d2bb
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 (!blk_rq_bytes(rq) || (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 /* ATA devices must be sector aligned */
1123 blk_queue_update_dma_alignment(sdev->request_queue,
1124 ATA_SECT_SIZE - 1);
1125 sdev->manage_start_stop = 1;
1126 }
1127
1128 if (dev->flags & ATA_DFLAG_AN)
1129 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1130
1131 if (dev->flags & ATA_DFLAG_NCQ) {
1132 int depth;
1133
1134 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1135 depth = min(ATA_MAX_QUEUE - 1, depth);
1136 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
1137 }
1138
1139 return 0;
1140 }
1141
1142 /**
1143 * ata_scsi_slave_config - Set SCSI device attributes
1144 * @sdev: SCSI device to examine
1145 *
1146 * This is called before we actually start reading
1147 * and writing to the device, to configure certain
1148 * SCSI mid-layer behaviors.
1149 *
1150 * LOCKING:
1151 * Defined by SCSI layer. We don't really care.
1152 */
1153
1154 int ata_scsi_slave_config(struct scsi_device *sdev)
1155 {
1156 struct ata_port *ap = ata_shost_to_port(sdev->host);
1157 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1158 int rc = 0;
1159
1160 ata_scsi_sdev_config(sdev);
1161
1162 if (dev)
1163 rc = ata_scsi_dev_config(sdev, dev);
1164
1165 return rc;
1166 }
1167
1168 /**
1169 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1170 * @sdev: SCSI device to be destroyed
1171 *
1172 * @sdev is about to be destroyed for hot/warm unplugging. If
1173 * this unplugging was initiated by libata as indicated by NULL
1174 * dev->sdev, this function doesn't have to do anything.
1175 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1176 * Clear dev->sdev, schedule the device for ATA detach and invoke
1177 * EH.
1178 *
1179 * LOCKING:
1180 * Defined by SCSI layer. We don't really care.
1181 */
1182 void ata_scsi_slave_destroy(struct scsi_device *sdev)
1183 {
1184 struct ata_port *ap = ata_shost_to_port(sdev->host);
1185 struct request_queue *q = sdev->request_queue;
1186 unsigned long flags;
1187 struct ata_device *dev;
1188
1189 if (!ap->ops->error_handler)
1190 return;
1191
1192 spin_lock_irqsave(ap->lock, flags);
1193 dev = __ata_scsi_find_dev(ap, sdev);
1194 if (dev && dev->sdev) {
1195 /* SCSI device already in CANCEL state, no need to offline it */
1196 dev->sdev = NULL;
1197 dev->flags |= ATA_DFLAG_DETACH;
1198 ata_port_schedule_eh(ap);
1199 }
1200 spin_unlock_irqrestore(ap->lock, flags);
1201
1202 kfree(q->dma_drain_buffer);
1203 q->dma_drain_buffer = NULL;
1204 q->dma_drain_size = 0;
1205 }
1206
1207 /**
1208 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1209 * @sdev: SCSI device to configure queue depth for
1210 * @queue_depth: new queue depth
1211 *
1212 * This is libata standard hostt->change_queue_depth callback.
1213 * SCSI will call into this callback when user tries to set queue
1214 * depth via sysfs.
1215 *
1216 * LOCKING:
1217 * SCSI layer (we don't care)
1218 *
1219 * RETURNS:
1220 * Newly configured queue depth.
1221 */
1222 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
1223 {
1224 struct ata_port *ap = ata_shost_to_port(sdev->host);
1225 struct ata_device *dev;
1226 unsigned long flags;
1227
1228 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1229 return sdev->queue_depth;
1230
1231 dev = ata_scsi_find_dev(ap, sdev);
1232 if (!dev || !ata_dev_enabled(dev))
1233 return sdev->queue_depth;
1234
1235 /* NCQ enabled? */
1236 spin_lock_irqsave(ap->lock, flags);
1237 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1238 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1239 dev->flags |= ATA_DFLAG_NCQ_OFF;
1240 queue_depth = 1;
1241 }
1242 spin_unlock_irqrestore(ap->lock, flags);
1243
1244 /* limit and apply queue depth */
1245 queue_depth = min(queue_depth, sdev->host->can_queue);
1246 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1247 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1248
1249 if (sdev->queue_depth == queue_depth)
1250 return -EINVAL;
1251
1252 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
1253 return queue_depth;
1254 }
1255
1256 /**
1257 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1258 * @qc: Storage for translated ATA taskfile
1259 *
1260 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1261 * (to start). Perhaps these commands should be preceded by
1262 * CHECK POWER MODE to see what power mode the device is already in.
1263 * [See SAT revision 5 at www.t10.org]
1264 *
1265 * LOCKING:
1266 * spin_lock_irqsave(host lock)
1267 *
1268 * RETURNS:
1269 * Zero on success, non-zero on error.
1270 */
1271 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1272 {
1273 struct scsi_cmnd *scmd = qc->scsicmd;
1274 struct ata_taskfile *tf = &qc->tf;
1275 const u8 *cdb = scmd->cmnd;
1276
1277 if (scmd->cmd_len < 5)
1278 goto invalid_fld;
1279
1280 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1281 tf->protocol = ATA_PROT_NODATA;
1282 if (cdb[1] & 0x1) {
1283 ; /* ignore IMMED bit, violates sat-r05 */
1284 }
1285 if (cdb[4] & 0x2)
1286 goto invalid_fld; /* LOEJ bit set not supported */
1287 if (((cdb[4] >> 4) & 0xf) != 0)
1288 goto invalid_fld; /* power conditions not supported */
1289
1290 if (cdb[4] & 0x1) {
1291 tf->nsect = 1; /* 1 sector, lba=0 */
1292
1293 if (qc->dev->flags & ATA_DFLAG_LBA) {
1294 tf->flags |= ATA_TFLAG_LBA;
1295
1296 tf->lbah = 0x0;
1297 tf->lbam = 0x0;
1298 tf->lbal = 0x0;
1299 tf->device |= ATA_LBA;
1300 } else {
1301 /* CHS */
1302 tf->lbal = 0x1; /* sect */
1303 tf->lbam = 0x0; /* cyl low */
1304 tf->lbah = 0x0; /* cyl high */
1305 }
1306
1307 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
1308 } else {
1309 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1310 * or S5) causing some drives to spin up and down again.
1311 */
1312 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1313 system_state == SYSTEM_POWER_OFF)
1314 goto skip;
1315
1316 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1317 system_entering_hibernation())
1318 goto skip;
1319
1320 /* Issue ATA STANDBY IMMEDIATE command */
1321 tf->command = ATA_CMD_STANDBYNOW1;
1322 }
1323
1324 /*
1325 * Standby and Idle condition timers could be implemented but that
1326 * would require libata to implement the Power condition mode page
1327 * and allow the user to change it. Changing mode pages requires
1328 * MODE SELECT to be implemented.
1329 */
1330
1331 return 0;
1332
1333 invalid_fld:
1334 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1335 /* "Invalid field in cbd" */
1336 return 1;
1337 skip:
1338 scmd->result = SAM_STAT_GOOD;
1339 return 1;
1340 }
1341
1342
1343 /**
1344 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1345 * @qc: Storage for translated ATA taskfile
1346 *
1347 * Sets up an ATA taskfile to issue FLUSH CACHE or
1348 * FLUSH CACHE EXT.
1349 *
1350 * LOCKING:
1351 * spin_lock_irqsave(host lock)
1352 *
1353 * RETURNS:
1354 * Zero on success, non-zero on error.
1355 */
1356 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1357 {
1358 struct ata_taskfile *tf = &qc->tf;
1359
1360 tf->flags |= ATA_TFLAG_DEVICE;
1361 tf->protocol = ATA_PROT_NODATA;
1362
1363 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1364 tf->command = ATA_CMD_FLUSH_EXT;
1365 else
1366 tf->command = ATA_CMD_FLUSH;
1367
1368 /* flush is critical for IO integrity, consider it an IO command */
1369 qc->flags |= ATA_QCFLAG_IO;
1370
1371 return 0;
1372 }
1373
1374 /**
1375 * scsi_6_lba_len - Get LBA and transfer length
1376 * @cdb: SCSI command to translate
1377 *
1378 * Calculate LBA and transfer length for 6-byte commands.
1379 *
1380 * RETURNS:
1381 * @plba: the LBA
1382 * @plen: the transfer length
1383 */
1384 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1385 {
1386 u64 lba = 0;
1387 u32 len;
1388
1389 VPRINTK("six-byte command\n");
1390
1391 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1392 lba |= ((u64)cdb[2]) << 8;
1393 lba |= ((u64)cdb[3]);
1394
1395 len = cdb[4];
1396
1397 *plba = lba;
1398 *plen = len;
1399 }
1400
1401 /**
1402 * scsi_10_lba_len - Get LBA and transfer length
1403 * @cdb: SCSI command to translate
1404 *
1405 * Calculate LBA and transfer length for 10-byte commands.
1406 *
1407 * RETURNS:
1408 * @plba: the LBA
1409 * @plen: the transfer length
1410 */
1411 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1412 {
1413 u64 lba = 0;
1414 u32 len = 0;
1415
1416 VPRINTK("ten-byte command\n");
1417
1418 lba |= ((u64)cdb[2]) << 24;
1419 lba |= ((u64)cdb[3]) << 16;
1420 lba |= ((u64)cdb[4]) << 8;
1421 lba |= ((u64)cdb[5]);
1422
1423 len |= ((u32)cdb[7]) << 8;
1424 len |= ((u32)cdb[8]);
1425
1426 *plba = lba;
1427 *plen = len;
1428 }
1429
1430 /**
1431 * scsi_16_lba_len - Get LBA and transfer length
1432 * @cdb: SCSI command to translate
1433 *
1434 * Calculate LBA and transfer length for 16-byte commands.
1435 *
1436 * RETURNS:
1437 * @plba: the LBA
1438 * @plen: the transfer length
1439 */
1440 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1441 {
1442 u64 lba = 0;
1443 u32 len = 0;
1444
1445 VPRINTK("sixteen-byte command\n");
1446
1447 lba |= ((u64)cdb[2]) << 56;
1448 lba |= ((u64)cdb[3]) << 48;
1449 lba |= ((u64)cdb[4]) << 40;
1450 lba |= ((u64)cdb[5]) << 32;
1451 lba |= ((u64)cdb[6]) << 24;
1452 lba |= ((u64)cdb[7]) << 16;
1453 lba |= ((u64)cdb[8]) << 8;
1454 lba |= ((u64)cdb[9]);
1455
1456 len |= ((u32)cdb[10]) << 24;
1457 len |= ((u32)cdb[11]) << 16;
1458 len |= ((u32)cdb[12]) << 8;
1459 len |= ((u32)cdb[13]);
1460
1461 *plba = lba;
1462 *plen = len;
1463 }
1464
1465 /**
1466 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1467 * @qc: Storage for translated ATA taskfile
1468 *
1469 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1470 *
1471 * LOCKING:
1472 * spin_lock_irqsave(host lock)
1473 *
1474 * RETURNS:
1475 * Zero on success, non-zero on error.
1476 */
1477 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1478 {
1479 struct scsi_cmnd *scmd = qc->scsicmd;
1480 struct ata_taskfile *tf = &qc->tf;
1481 struct ata_device *dev = qc->dev;
1482 u64 dev_sectors = qc->dev->n_sectors;
1483 const u8 *cdb = scmd->cmnd;
1484 u64 block;
1485 u32 n_block;
1486
1487 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1488 tf->protocol = ATA_PROT_NODATA;
1489
1490 if (cdb[0] == VERIFY) {
1491 if (scmd->cmd_len < 10)
1492 goto invalid_fld;
1493 scsi_10_lba_len(cdb, &block, &n_block);
1494 } else if (cdb[0] == VERIFY_16) {
1495 if (scmd->cmd_len < 16)
1496 goto invalid_fld;
1497 scsi_16_lba_len(cdb, &block, &n_block);
1498 } else
1499 goto invalid_fld;
1500
1501 if (!n_block)
1502 goto nothing_to_do;
1503 if (block >= dev_sectors)
1504 goto out_of_range;
1505 if ((block + n_block) > dev_sectors)
1506 goto out_of_range;
1507
1508 if (dev->flags & ATA_DFLAG_LBA) {
1509 tf->flags |= ATA_TFLAG_LBA;
1510
1511 if (lba_28_ok(block, n_block)) {
1512 /* use LBA28 */
1513 tf->command = ATA_CMD_VERIFY;
1514 tf->device |= (block >> 24) & 0xf;
1515 } else if (lba_48_ok(block, n_block)) {
1516 if (!(dev->flags & ATA_DFLAG_LBA48))
1517 goto out_of_range;
1518
1519 /* use LBA48 */
1520 tf->flags |= ATA_TFLAG_LBA48;
1521 tf->command = ATA_CMD_VERIFY_EXT;
1522
1523 tf->hob_nsect = (n_block >> 8) & 0xff;
1524
1525 tf->hob_lbah = (block >> 40) & 0xff;
1526 tf->hob_lbam = (block >> 32) & 0xff;
1527 tf->hob_lbal = (block >> 24) & 0xff;
1528 } else
1529 /* request too large even for LBA48 */
1530 goto out_of_range;
1531
1532 tf->nsect = n_block & 0xff;
1533
1534 tf->lbah = (block >> 16) & 0xff;
1535 tf->lbam = (block >> 8) & 0xff;
1536 tf->lbal = block & 0xff;
1537
1538 tf->device |= ATA_LBA;
1539 } else {
1540 /* CHS */
1541 u32 sect, head, cyl, track;
1542
1543 if (!lba_28_ok(block, n_block))
1544 goto out_of_range;
1545
1546 /* Convert LBA to CHS */
1547 track = (u32)block / dev->sectors;
1548 cyl = track / dev->heads;
1549 head = track % dev->heads;
1550 sect = (u32)block % dev->sectors + 1;
1551
1552 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1553 (u32)block, track, cyl, head, sect);
1554
1555 /* Check whether the converted CHS can fit.
1556 Cylinder: 0-65535
1557 Head: 0-15
1558 Sector: 1-255*/
1559 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1560 goto out_of_range;
1561
1562 tf->command = ATA_CMD_VERIFY;
1563 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1564 tf->lbal = sect;
1565 tf->lbam = cyl;
1566 tf->lbah = cyl >> 8;
1567 tf->device |= head;
1568 }
1569
1570 return 0;
1571
1572 invalid_fld:
1573 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1574 /* "Invalid field in cbd" */
1575 return 1;
1576
1577 out_of_range:
1578 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1579 /* "Logical Block Address out of range" */
1580 return 1;
1581
1582 nothing_to_do:
1583 scmd->result = SAM_STAT_GOOD;
1584 return 1;
1585 }
1586
1587 /**
1588 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1589 * @qc: Storage for translated ATA taskfile
1590 *
1591 * Converts any of six SCSI read/write commands into the
1592 * ATA counterpart, including starting sector (LBA),
1593 * sector count, and taking into account the device's LBA48
1594 * support.
1595 *
1596 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1597 * %WRITE_16 are currently supported.
1598 *
1599 * LOCKING:
1600 * spin_lock_irqsave(host lock)
1601 *
1602 * RETURNS:
1603 * Zero on success, non-zero on error.
1604 */
1605 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1606 {
1607 struct scsi_cmnd *scmd = qc->scsicmd;
1608 const u8 *cdb = scmd->cmnd;
1609 unsigned int tf_flags = 0;
1610 u64 block;
1611 u32 n_block;
1612 int rc;
1613
1614 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1615 tf_flags |= ATA_TFLAG_WRITE;
1616
1617 /* Calculate the SCSI LBA, transfer length and FUA. */
1618 switch (cdb[0]) {
1619 case READ_10:
1620 case WRITE_10:
1621 if (unlikely(scmd->cmd_len < 10))
1622 goto invalid_fld;
1623 scsi_10_lba_len(cdb, &block, &n_block);
1624 if (unlikely(cdb[1] & (1 << 3)))
1625 tf_flags |= ATA_TFLAG_FUA;
1626 break;
1627 case READ_6:
1628 case WRITE_6:
1629 if (unlikely(scmd->cmd_len < 6))
1630 goto invalid_fld;
1631 scsi_6_lba_len(cdb, &block, &n_block);
1632
1633 /* for 6-byte r/w commands, transfer length 0
1634 * means 256 blocks of data, not 0 block.
1635 */
1636 if (!n_block)
1637 n_block = 256;
1638 break;
1639 case READ_16:
1640 case WRITE_16:
1641 if (unlikely(scmd->cmd_len < 16))
1642 goto invalid_fld;
1643 scsi_16_lba_len(cdb, &block, &n_block);
1644 if (unlikely(cdb[1] & (1 << 3)))
1645 tf_flags |= ATA_TFLAG_FUA;
1646 break;
1647 default:
1648 DPRINTK("no-byte command\n");
1649 goto invalid_fld;
1650 }
1651
1652 /* Check and compose ATA command */
1653 if (!n_block)
1654 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1655 * length 0 means transfer 0 block of data.
1656 * However, for ATA R/W commands, sector count 0 means
1657 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1658 *
1659 * WARNING: one or two older ATA drives treat 0 as 0...
1660 */
1661 goto nothing_to_do;
1662
1663 qc->flags |= ATA_QCFLAG_IO;
1664 qc->nbytes = n_block * ATA_SECT_SIZE;
1665
1666 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1667 qc->tag);
1668 if (likely(rc == 0))
1669 return 0;
1670
1671 if (rc == -ERANGE)
1672 goto out_of_range;
1673 /* treat all other errors as -EINVAL, fall through */
1674 invalid_fld:
1675 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1676 /* "Invalid field in cbd" */
1677 return 1;
1678
1679 out_of_range:
1680 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1681 /* "Logical Block Address out of range" */
1682 return 1;
1683
1684 nothing_to_do:
1685 scmd->result = SAM_STAT_GOOD;
1686 return 1;
1687 }
1688
1689 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1690 {
1691 struct ata_port *ap = qc->ap;
1692 struct scsi_cmnd *cmd = qc->scsicmd;
1693 u8 *cdb = cmd->cmnd;
1694 int need_sense = (qc->err_mask != 0);
1695
1696 /* For ATA pass thru (SAT) commands, generate a sense block if
1697 * user mandated it or if there's an error. Note that if we
1698 * generate because the user forced us to, a check condition
1699 * is generated and the ATA register values are returned
1700 * whether the command completed successfully or not. If there
1701 * was no error, SK, ASC and ASCQ will all be zero.
1702 */
1703 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1704 ((cdb[2] & 0x20) || need_sense)) {
1705 ata_gen_passthru_sense(qc);
1706 } else {
1707 if (!need_sense) {
1708 cmd->result = SAM_STAT_GOOD;
1709 } else {
1710 /* TODO: decide which descriptor format to use
1711 * for 48b LBA devices and call that here
1712 * instead of the fixed desc, which is only
1713 * good for smaller LBA (and maybe CHS?)
1714 * devices.
1715 */
1716 ata_gen_ata_sense(qc);
1717 }
1718 }
1719
1720 if (need_sense && !ap->ops->error_handler)
1721 ata_dump_status(ap->print_id, &qc->result_tf);
1722
1723 qc->scsidone(cmd);
1724
1725 ata_qc_free(qc);
1726 }
1727
1728 /**
1729 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1730 * @dev: ATA device to which the command is addressed
1731 * @cmd: SCSI command to execute
1732 * @done: SCSI command completion function
1733 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1734 *
1735 * Our ->queuecommand() function has decided that the SCSI
1736 * command issued can be directly translated into an ATA
1737 * command, rather than handled internally.
1738 *
1739 * This function sets up an ata_queued_cmd structure for the
1740 * SCSI command, and sends that ata_queued_cmd to the hardware.
1741 *
1742 * The xlat_func argument (actor) returns 0 if ready to execute
1743 * ATA command, else 1 to finish translation. If 1 is returned
1744 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1745 * to be set reflecting an error condition or clean (early)
1746 * termination.
1747 *
1748 * LOCKING:
1749 * spin_lock_irqsave(host lock)
1750 *
1751 * RETURNS:
1752 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1753 * needs to be deferred.
1754 */
1755 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1756 void (*done)(struct scsi_cmnd *),
1757 ata_xlat_func_t xlat_func)
1758 {
1759 struct ata_port *ap = dev->link->ap;
1760 struct ata_queued_cmd *qc;
1761 int rc;
1762
1763 VPRINTK("ENTER\n");
1764
1765 qc = ata_scsi_qc_new(dev, cmd, done);
1766 if (!qc)
1767 goto err_mem;
1768
1769 /* data is present; dma-map it */
1770 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1771 cmd->sc_data_direction == DMA_TO_DEVICE) {
1772 if (unlikely(scsi_bufflen(cmd) < 1)) {
1773 ata_dev_printk(dev, KERN_WARNING,
1774 "WARNING: zero len r/w req\n");
1775 goto err_did;
1776 }
1777
1778 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1779
1780 qc->dma_dir = cmd->sc_data_direction;
1781 }
1782
1783 qc->complete_fn = ata_scsi_qc_complete;
1784
1785 if (xlat_func(qc))
1786 goto early_finish;
1787
1788 if (ap->ops->qc_defer) {
1789 if ((rc = ap->ops->qc_defer(qc)))
1790 goto defer;
1791 }
1792
1793 /* select device, send command to hardware */
1794 ata_qc_issue(qc);
1795
1796 VPRINTK("EXIT\n");
1797 return 0;
1798
1799 early_finish:
1800 ata_qc_free(qc);
1801 qc->scsidone(cmd);
1802 DPRINTK("EXIT - early finish (good or error)\n");
1803 return 0;
1804
1805 err_did:
1806 ata_qc_free(qc);
1807 cmd->result = (DID_ERROR << 16);
1808 qc->scsidone(cmd);
1809 err_mem:
1810 DPRINTK("EXIT - internal\n");
1811 return 0;
1812
1813 defer:
1814 ata_qc_free(qc);
1815 DPRINTK("EXIT - defer\n");
1816 if (rc == ATA_DEFER_LINK)
1817 return SCSI_MLQUEUE_DEVICE_BUSY;
1818 else
1819 return SCSI_MLQUEUE_HOST_BUSY;
1820 }
1821
1822 /**
1823 * ata_scsi_rbuf_get - Map response buffer.
1824 * @cmd: SCSI command containing buffer to be mapped.
1825 * @flags: unsigned long variable to store irq enable status
1826 * @copy_in: copy in from user buffer
1827 *
1828 * Prepare buffer for simulated SCSI commands.
1829 *
1830 * LOCKING:
1831 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1832 *
1833 * RETURNS:
1834 * Pointer to response buffer.
1835 */
1836 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1837 unsigned long *flags)
1838 {
1839 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1840
1841 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1842 if (copy_in)
1843 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1844 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1845 return ata_scsi_rbuf;
1846 }
1847
1848 /**
1849 * ata_scsi_rbuf_put - Unmap response buffer.
1850 * @cmd: SCSI command containing buffer to be unmapped.
1851 * @copy_out: copy out result
1852 * @flags: @flags passed to ata_scsi_rbuf_get()
1853 *
1854 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1855 * @copy_back is true.
1856 *
1857 * LOCKING:
1858 * Unlocks ata_scsi_rbuf_lock.
1859 */
1860 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1861 unsigned long *flags)
1862 {
1863 if (copy_out)
1864 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1865 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1866 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1867 }
1868
1869 /**
1870 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1871 * @args: device IDENTIFY data / SCSI command of interest.
1872 * @actor: Callback hook for desired SCSI command simulator
1873 *
1874 * Takes care of the hard work of simulating a SCSI command...
1875 * Mapping the response buffer, calling the command's handler,
1876 * and handling the handler's return value. This return value
1877 * indicates whether the handler wishes the SCSI command to be
1878 * completed successfully (0), or not (in which case cmd->result
1879 * and sense buffer are assumed to be set).
1880 *
1881 * LOCKING:
1882 * spin_lock_irqsave(host lock)
1883 */
1884 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1885 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1886 {
1887 u8 *rbuf;
1888 unsigned int rc;
1889 struct scsi_cmnd *cmd = args->cmd;
1890 unsigned long flags;
1891
1892 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1893 rc = actor(args, rbuf);
1894 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
1895
1896 if (rc == 0)
1897 cmd->result = SAM_STAT_GOOD;
1898 args->done(cmd);
1899 }
1900
1901 /**
1902 * ata_scsiop_inq_std - Simulate INQUIRY command
1903 * @args: device IDENTIFY data / SCSI command of interest.
1904 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1905 *
1906 * Returns standard device identification data associated
1907 * with non-VPD INQUIRY command output.
1908 *
1909 * LOCKING:
1910 * spin_lock_irqsave(host lock)
1911 */
1912 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1913 {
1914 const u8 versions[] = {
1915 0x60, /* SAM-3 (no version claimed) */
1916
1917 0x03,
1918 0x20, /* SBC-2 (no version claimed) */
1919
1920 0x02,
1921 0x60 /* SPC-3 (no version claimed) */
1922 };
1923 u8 hdr[] = {
1924 TYPE_DISK,
1925 0,
1926 0x5, /* claim SPC-3 version compatibility */
1927 2,
1928 95 - 4
1929 };
1930
1931 VPRINTK("ENTER\n");
1932
1933 /* set scsi removeable (RMB) bit per ata bit */
1934 if (ata_id_removeable(args->id))
1935 hdr[1] |= (1 << 7);
1936
1937 memcpy(rbuf, hdr, sizeof(hdr));
1938 memcpy(&rbuf[8], "ATA ", 8);
1939 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1940 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1941
1942 if (rbuf[32] == 0 || rbuf[32] == ' ')
1943 memcpy(&rbuf[32], "n/a ", 4);
1944
1945 memcpy(rbuf + 59, versions, sizeof(versions));
1946
1947 return 0;
1948 }
1949
1950 /**
1951 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1952 * @args: device IDENTIFY data / SCSI command of interest.
1953 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1954 *
1955 * Returns list of inquiry VPD pages available.
1956 *
1957 * LOCKING:
1958 * spin_lock_irqsave(host lock)
1959 */
1960 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
1961 {
1962 const u8 pages[] = {
1963 0x00, /* page 0x00, this page */
1964 0x80, /* page 0x80, unit serial no page */
1965 0x83, /* page 0x83, device ident page */
1966 0x89, /* page 0x89, ata info page */
1967 0xb1, /* page 0xb1, block device characteristics page */
1968 };
1969
1970 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
1971 memcpy(rbuf + 4, pages, sizeof(pages));
1972 return 0;
1973 }
1974
1975 /**
1976 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1977 * @args: device IDENTIFY data / SCSI command of interest.
1978 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1979 *
1980 * Returns ATA device serial number.
1981 *
1982 * LOCKING:
1983 * spin_lock_irqsave(host lock)
1984 */
1985 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
1986 {
1987 const u8 hdr[] = {
1988 0,
1989 0x80, /* this page code */
1990 0,
1991 ATA_ID_SERNO_LEN, /* page len */
1992 };
1993
1994 memcpy(rbuf, hdr, sizeof(hdr));
1995 ata_id_string(args->id, (unsigned char *) &rbuf[4],
1996 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1997 return 0;
1998 }
1999
2000 /**
2001 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2002 * @args: device IDENTIFY data / SCSI command of interest.
2003 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2004 *
2005 * Yields two logical unit device identification designators:
2006 * - vendor specific ASCII containing the ATA serial number
2007 * - SAT defined "t10 vendor id based" containing ASCII vendor
2008 * name ("ATA "), model and serial numbers.
2009 *
2010 * LOCKING:
2011 * spin_lock_irqsave(host lock)
2012 */
2013 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
2014 {
2015 const int sat_model_serial_desc_len = 68;
2016 int num;
2017
2018 rbuf[1] = 0x83; /* this page code */
2019 num = 4;
2020
2021 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2022 rbuf[num + 0] = 2;
2023 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2024 num += 4;
2025 ata_id_string(args->id, (unsigned char *) rbuf + num,
2026 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2027 num += ATA_ID_SERNO_LEN;
2028
2029 /* SAT defined lu model and serial numbers descriptor */
2030 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2031 rbuf[num + 0] = 2;
2032 rbuf[num + 1] = 1;
2033 rbuf[num + 3] = sat_model_serial_desc_len;
2034 num += 4;
2035 memcpy(rbuf + num, "ATA ", 8);
2036 num += 8;
2037 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2038 ATA_ID_PROD_LEN);
2039 num += ATA_ID_PROD_LEN;
2040 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2041 ATA_ID_SERNO_LEN);
2042 num += ATA_ID_SERNO_LEN;
2043
2044 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
2045 return 0;
2046 }
2047
2048 /**
2049 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2050 * @args: device IDENTIFY data / SCSI command of interest.
2051 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2052 *
2053 * Yields SAT-specified ATA VPD page.
2054 *
2055 * LOCKING:
2056 * spin_lock_irqsave(host lock)
2057 */
2058 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
2059 {
2060 struct ata_taskfile tf;
2061
2062 memset(&tf, 0, sizeof(tf));
2063
2064 rbuf[1] = 0x89; /* our page code */
2065 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2066 rbuf[3] = (0x238 & 0xff);
2067
2068 memcpy(&rbuf[8], "linux ", 8);
2069 memcpy(&rbuf[16], "libata ", 16);
2070 memcpy(&rbuf[32], DRV_VERSION, 4);
2071 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
2072
2073 /* we don't store the ATA device signature, so we fake it */
2074
2075 tf.command = ATA_DRDY; /* really, this is Status reg */
2076 tf.lbal = 0x1;
2077 tf.nsect = 0x1;
2078
2079 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2080 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
2081
2082 rbuf[56] = ATA_CMD_ID_ATA;
2083
2084 memcpy(&rbuf[60], &args->id[0], 512);
2085 return 0;
2086 }
2087
2088 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2089 {
2090 int form_factor = ata_id_form_factor(args->id);
2091 int media_rotation_rate = ata_id_rotation_rate(args->id);
2092
2093 rbuf[1] = 0xb1;
2094 rbuf[3] = 0x3c;
2095 rbuf[4] = media_rotation_rate >> 8;
2096 rbuf[5] = media_rotation_rate;
2097 rbuf[7] = form_factor;
2098
2099 return 0;
2100 }
2101
2102 /**
2103 * ata_scsiop_noop - Command handler that simply returns success.
2104 * @args: device IDENTIFY data / SCSI command of interest.
2105 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2106 *
2107 * No operation. Simply returns success to caller, to indicate
2108 * that the caller should successfully complete this SCSI command.
2109 *
2110 * LOCKING:
2111 * spin_lock_irqsave(host lock)
2112 */
2113 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
2114 {
2115 VPRINTK("ENTER\n");
2116 return 0;
2117 }
2118
2119 /**
2120 * ata_msense_caching - Simulate MODE SENSE caching info page
2121 * @id: device IDENTIFY data
2122 * @buf: output buffer
2123 *
2124 * Generate a caching info page, which conditionally indicates
2125 * write caching to the SCSI layer, depending on device
2126 * capabilities.
2127 *
2128 * LOCKING:
2129 * None.
2130 */
2131 static unsigned int ata_msense_caching(u16 *id, u8 *buf)
2132 {
2133 memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage));
2134 if (ata_id_wcache_enabled(id))
2135 buf[2] |= (1 << 2); /* write cache enable */
2136 if (!ata_id_rahead_enabled(id))
2137 buf[12] |= (1 << 5); /* disable read ahead */
2138 return sizeof(def_cache_mpage);
2139 }
2140
2141 /**
2142 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2143 * @buf: output buffer
2144 *
2145 * Generate a generic MODE SENSE control mode page.
2146 *
2147 * LOCKING:
2148 * None.
2149 */
2150 static unsigned int ata_msense_ctl_mode(u8 *buf)
2151 {
2152 memcpy(buf, def_control_mpage, sizeof(def_control_mpage));
2153 return sizeof(def_control_mpage);
2154 }
2155
2156 /**
2157 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2158 * @buf: output buffer
2159 *
2160 * Generate a generic MODE SENSE r/w error recovery page.
2161 *
2162 * LOCKING:
2163 * None.
2164 */
2165 static unsigned int ata_msense_rw_recovery(u8 *buf)
2166 {
2167 memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage));
2168 return sizeof(def_rw_recovery_mpage);
2169 }
2170
2171 /*
2172 * We can turn this into a real blacklist if it's needed, for now just
2173 * blacklist any Maxtor BANC1G10 revision firmware
2174 */
2175 static int ata_dev_supports_fua(u16 *id)
2176 {
2177 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2178
2179 if (!libata_fua)
2180 return 0;
2181 if (!ata_id_has_fua(id))
2182 return 0;
2183
2184 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2185 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2186
2187 if (strcmp(model, "Maxtor"))
2188 return 1;
2189 if (strcmp(fw, "BANC1G10"))
2190 return 1;
2191
2192 return 0; /* blacklisted */
2193 }
2194
2195 /**
2196 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2197 * @args: device IDENTIFY data / SCSI command of interest.
2198 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2199 *
2200 * Simulate MODE SENSE commands. Assume this is invoked for direct
2201 * access devices (e.g. disks) only. There should be no block
2202 * descriptor for other device types.
2203 *
2204 * LOCKING:
2205 * spin_lock_irqsave(host lock)
2206 */
2207 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
2208 {
2209 struct ata_device *dev = args->dev;
2210 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
2211 const u8 sat_blk_desc[] = {
2212 0, 0, 0, 0, /* number of blocks: sat unspecified */
2213 0,
2214 0, 0x2, 0x0 /* block length: 512 bytes */
2215 };
2216 u8 pg, spg;
2217 unsigned int ebd, page_control, six_byte;
2218 u8 dpofua;
2219
2220 VPRINTK("ENTER\n");
2221
2222 six_byte = (scsicmd[0] == MODE_SENSE);
2223 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2224 /*
2225 * LLBA bit in msense(10) ignored (compliant)
2226 */
2227
2228 page_control = scsicmd[2] >> 6;
2229 switch (page_control) {
2230 case 0: /* current */
2231 break; /* supported */
2232 case 3: /* saved */
2233 goto saving_not_supp;
2234 case 1: /* changeable */
2235 case 2: /* defaults */
2236 default:
2237 goto invalid_fld;
2238 }
2239
2240 if (six_byte)
2241 p += 4 + (ebd ? 8 : 0);
2242 else
2243 p += 8 + (ebd ? 8 : 0);
2244
2245 pg = scsicmd[2] & 0x3f;
2246 spg = scsicmd[3];
2247 /*
2248 * No mode subpages supported (yet) but asking for _all_
2249 * subpages may be valid
2250 */
2251 if (spg && (spg != ALL_SUB_MPAGES))
2252 goto invalid_fld;
2253
2254 switch(pg) {
2255 case RW_RECOVERY_MPAGE:
2256 p += ata_msense_rw_recovery(p);
2257 break;
2258
2259 case CACHE_MPAGE:
2260 p += ata_msense_caching(args->id, p);
2261 break;
2262
2263 case CONTROL_MPAGE:
2264 p += ata_msense_ctl_mode(p);
2265 break;
2266
2267 case ALL_MPAGES:
2268 p += ata_msense_rw_recovery(p);
2269 p += ata_msense_caching(args->id, p);
2270 p += ata_msense_ctl_mode(p);
2271 break;
2272
2273 default: /* invalid page code */
2274 goto invalid_fld;
2275 }
2276
2277 dpofua = 0;
2278 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2279 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2280 dpofua = 1 << 4;
2281
2282 if (six_byte) {
2283 rbuf[0] = p - rbuf - 1;
2284 rbuf[2] |= dpofua;
2285 if (ebd) {
2286 rbuf[3] = sizeof(sat_blk_desc);
2287 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2288 }
2289 } else {
2290 unsigned int output_len = p - rbuf - 2;
2291
2292 rbuf[0] = output_len >> 8;
2293 rbuf[1] = output_len;
2294 rbuf[3] |= dpofua;
2295 if (ebd) {
2296 rbuf[7] = sizeof(sat_blk_desc);
2297 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2298 }
2299 }
2300 return 0;
2301
2302 invalid_fld:
2303 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2304 /* "Invalid field in cbd" */
2305 return 1;
2306
2307 saving_not_supp:
2308 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2309 /* "Saving parameters not supported" */
2310 return 1;
2311 }
2312
2313 /**
2314 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2315 * @args: device IDENTIFY data / SCSI command of interest.
2316 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2317 *
2318 * Simulate READ CAPACITY commands.
2319 *
2320 * LOCKING:
2321 * None.
2322 */
2323 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
2324 {
2325 struct ata_device *dev = args->dev;
2326 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
2327 u8 log_per_phys = 0;
2328 u16 lowest_aligned = 0;
2329 u16 word_106 = dev->id[106];
2330 u16 word_209 = dev->id[209];
2331
2332 if ((word_106 & 0xc000) == 0x4000) {
2333 /* Number and offset of logical sectors per physical sector */
2334 if (word_106 & (1 << 13))
2335 log_per_phys = word_106 & 0xf;
2336 if ((word_209 & 0xc000) == 0x4000) {
2337 u16 first = dev->id[209] & 0x3fff;
2338 if (first > 0)
2339 lowest_aligned = (1 << log_per_phys) - first;
2340 }
2341 }
2342
2343 VPRINTK("ENTER\n");
2344
2345 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2346 if (last_lba >= 0xffffffffULL)
2347 last_lba = 0xffffffff;
2348
2349 /* sector count, 32-bit */
2350 rbuf[0] = last_lba >> (8 * 3);
2351 rbuf[1] = last_lba >> (8 * 2);
2352 rbuf[2] = last_lba >> (8 * 1);
2353 rbuf[3] = last_lba;
2354
2355 /* sector size */
2356 rbuf[6] = ATA_SECT_SIZE >> 8;
2357 rbuf[7] = ATA_SECT_SIZE & 0xff;
2358 } else {
2359 /* sector count, 64-bit */
2360 rbuf[0] = last_lba >> (8 * 7);
2361 rbuf[1] = last_lba >> (8 * 6);
2362 rbuf[2] = last_lba >> (8 * 5);
2363 rbuf[3] = last_lba >> (8 * 4);
2364 rbuf[4] = last_lba >> (8 * 3);
2365 rbuf[5] = last_lba >> (8 * 2);
2366 rbuf[6] = last_lba >> (8 * 1);
2367 rbuf[7] = last_lba;
2368
2369 /* sector size */
2370 rbuf[10] = ATA_SECT_SIZE >> 8;
2371 rbuf[11] = ATA_SECT_SIZE & 0xff;
2372
2373 rbuf[12] = 0;
2374 rbuf[13] = log_per_phys;
2375 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2376 rbuf[15] = lowest_aligned;
2377 }
2378
2379 return 0;
2380 }
2381
2382 /**
2383 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2384 * @args: device IDENTIFY data / SCSI command of interest.
2385 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2386 *
2387 * Simulate REPORT LUNS command.
2388 *
2389 * LOCKING:
2390 * spin_lock_irqsave(host lock)
2391 */
2392 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
2393 {
2394 VPRINTK("ENTER\n");
2395 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2396
2397 return 0;
2398 }
2399
2400 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2401 {
2402 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2403 /* FIXME: not quite right; we don't want the
2404 * translation of taskfile registers into
2405 * a sense descriptors, since that's only
2406 * correct for ATA, not ATAPI
2407 */
2408 ata_gen_passthru_sense(qc);
2409 }
2410
2411 qc->scsidone(qc->scsicmd);
2412 ata_qc_free(qc);
2413 }
2414
2415 /* is it pointless to prefer PIO for "safety reasons"? */
2416 static inline int ata_pio_use_silly(struct ata_port *ap)
2417 {
2418 return (ap->flags & ATA_FLAG_PIO_DMA);
2419 }
2420
2421 static void atapi_request_sense(struct ata_queued_cmd *qc)
2422 {
2423 struct ata_port *ap = qc->ap;
2424 struct scsi_cmnd *cmd = qc->scsicmd;
2425
2426 DPRINTK("ATAPI request sense\n");
2427
2428 /* FIXME: is this needed? */
2429 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2430
2431 #ifdef CONFIG_ATA_SFF
2432 if (ap->ops->sff_tf_read)
2433 ap->ops->sff_tf_read(ap, &qc->tf);
2434 #endif
2435
2436 /* fill these in, for the case where they are -not- overwritten */
2437 cmd->sense_buffer[0] = 0x70;
2438 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2439
2440 ata_qc_reinit(qc);
2441
2442 /* setup sg table and init transfer direction */
2443 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2444 ata_sg_init(qc, &qc->sgent, 1);
2445 qc->dma_dir = DMA_FROM_DEVICE;
2446
2447 memset(&qc->cdb, 0, qc->dev->cdb_len);
2448 qc->cdb[0] = REQUEST_SENSE;
2449 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2450
2451 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2452 qc->tf.command = ATA_CMD_PACKET;
2453
2454 if (ata_pio_use_silly(ap)) {
2455 qc->tf.protocol = ATAPI_PROT_DMA;
2456 qc->tf.feature |= ATAPI_PKT_DMA;
2457 } else {
2458 qc->tf.protocol = ATAPI_PROT_PIO;
2459 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2460 qc->tf.lbah = 0;
2461 }
2462 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2463
2464 qc->complete_fn = atapi_sense_complete;
2465
2466 ata_qc_issue(qc);
2467
2468 DPRINTK("EXIT\n");
2469 }
2470
2471 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2472 {
2473 struct scsi_cmnd *cmd = qc->scsicmd;
2474 unsigned int err_mask = qc->err_mask;
2475
2476 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2477
2478 /* handle completion from new EH */
2479 if (unlikely(qc->ap->ops->error_handler &&
2480 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2481
2482 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2483 /* FIXME: not quite right; we don't want the
2484 * translation of taskfile registers into a
2485 * sense descriptors, since that's only
2486 * correct for ATA, not ATAPI
2487 */
2488 ata_gen_passthru_sense(qc);
2489 }
2490
2491 /* SCSI EH automatically locks door if sdev->locked is
2492 * set. Sometimes door lock request continues to
2493 * fail, for example, when no media is present. This
2494 * creates a loop - SCSI EH issues door lock which
2495 * fails and gets invoked again to acquire sense data
2496 * for the failed command.
2497 *
2498 * If door lock fails, always clear sdev->locked to
2499 * avoid this infinite loop.
2500 */
2501 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
2502 qc->dev->sdev->locked = 0;
2503
2504 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2505 qc->scsidone(cmd);
2506 ata_qc_free(qc);
2507 return;
2508 }
2509
2510 /* successful completion or old EH failure path */
2511 if (unlikely(err_mask & AC_ERR_DEV)) {
2512 cmd->result = SAM_STAT_CHECK_CONDITION;
2513 atapi_request_sense(qc);
2514 return;
2515 } else if (unlikely(err_mask)) {
2516 /* FIXME: not quite right; we don't want the
2517 * translation of taskfile registers into
2518 * a sense descriptors, since that's only
2519 * correct for ATA, not ATAPI
2520 */
2521 ata_gen_passthru_sense(qc);
2522 } else {
2523 u8 *scsicmd = cmd->cmnd;
2524
2525 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2526 unsigned long flags;
2527 u8 *buf;
2528
2529 buf = ata_scsi_rbuf_get(cmd, true, &flags);
2530
2531 /* ATAPI devices typically report zero for their SCSI version,
2532 * and sometimes deviate from the spec WRT response data
2533 * format. If SCSI version is reported as zero like normal,
2534 * then we make the following fixups: 1) Fake MMC-5 version,
2535 * to indicate to the Linux scsi midlayer this is a modern
2536 * device. 2) Ensure response data format / ATAPI information
2537 * are always correct.
2538 */
2539 if (buf[2] == 0) {
2540 buf[2] = 0x5;
2541 buf[3] = 0x32;
2542 }
2543
2544 ata_scsi_rbuf_put(cmd, true, &flags);
2545 }
2546
2547 cmd->result = SAM_STAT_GOOD;
2548 }
2549
2550 qc->scsidone(cmd);
2551 ata_qc_free(qc);
2552 }
2553 /**
2554 * atapi_xlat - Initialize PACKET taskfile
2555 * @qc: command structure to be initialized
2556 *
2557 * LOCKING:
2558 * spin_lock_irqsave(host lock)
2559 *
2560 * RETURNS:
2561 * Zero on success, non-zero on failure.
2562 */
2563 static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2564 {
2565 struct scsi_cmnd *scmd = qc->scsicmd;
2566 struct ata_device *dev = qc->dev;
2567 int nodata = (scmd->sc_data_direction == DMA_NONE);
2568 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2569 unsigned int nbytes;
2570
2571 memset(qc->cdb, 0, dev->cdb_len);
2572 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2573
2574 qc->complete_fn = atapi_qc_complete;
2575
2576 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2577 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2578 qc->tf.flags |= ATA_TFLAG_WRITE;
2579 DPRINTK("direction: write\n");
2580 }
2581
2582 qc->tf.command = ATA_CMD_PACKET;
2583 ata_qc_set_pc_nbytes(qc);
2584
2585 /* check whether ATAPI DMA is safe */
2586 if (!nodata && !using_pio && atapi_check_dma(qc))
2587 using_pio = 1;
2588
2589 /* Some controller variants snoop this value for Packet
2590 * transfers to do state machine and FIFO management. Thus we
2591 * want to set it properly, and for DMA where it is
2592 * effectively meaningless.
2593 */
2594 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2595
2596 /* Most ATAPI devices which honor transfer chunk size don't
2597 * behave according to the spec when odd chunk size which
2598 * matches the transfer length is specified. If the number of
2599 * bytes to transfer is 2n+1. According to the spec, what
2600 * should happen is to indicate that 2n+1 is going to be
2601 * transferred and transfer 2n+2 bytes where the last byte is
2602 * padding.
2603 *
2604 * In practice, this doesn't happen. ATAPI devices first
2605 * indicate and transfer 2n bytes and then indicate and
2606 * transfer 2 bytes where the last byte is padding.
2607 *
2608 * This inconsistency confuses several controllers which
2609 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2610 * These controllers use actual number of transferred bytes to
2611 * update DMA poitner and transfer of 4n+2 bytes make those
2612 * controller push DMA pointer by 4n+4 bytes because SATA data
2613 * FISes are aligned to 4 bytes. This causes data corruption
2614 * and buffer overrun.
2615 *
2616 * Always setting nbytes to even number solves this problem
2617 * because then ATAPI devices don't have to split data at 2n
2618 * boundaries.
2619 */
2620 if (nbytes & 0x1)
2621 nbytes++;
2622
2623 qc->tf.lbam = (nbytes & 0xFF);
2624 qc->tf.lbah = (nbytes >> 8);
2625
2626 if (nodata)
2627 qc->tf.protocol = ATAPI_PROT_NODATA;
2628 else if (using_pio)
2629 qc->tf.protocol = ATAPI_PROT_PIO;
2630 else {
2631 /* DMA data xfer */
2632 qc->tf.protocol = ATAPI_PROT_DMA;
2633 qc->tf.feature |= ATAPI_PKT_DMA;
2634
2635 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2636 (scmd->sc_data_direction != DMA_TO_DEVICE))
2637 /* some SATA bridges need us to indicate data xfer direction */
2638 qc->tf.feature |= ATAPI_DMADIR;
2639 }
2640
2641
2642 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2643 as ATAPI tape drives don't get this right otherwise */
2644 return 0;
2645 }
2646
2647 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2648 {
2649 if (!sata_pmp_attached(ap)) {
2650 if (likely(devno < ata_link_max_devices(&ap->link)))
2651 return &ap->link.device[devno];
2652 } else {
2653 if (likely(devno < ap->nr_pmp_links))
2654 return &ap->pmp_link[devno].device[0];
2655 }
2656
2657 return NULL;
2658 }
2659
2660 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2661 const struct scsi_device *scsidev)
2662 {
2663 int devno;
2664
2665 /* skip commands not addressed to targets we simulate */
2666 if (!sata_pmp_attached(ap)) {
2667 if (unlikely(scsidev->channel || scsidev->lun))
2668 return NULL;
2669 devno = scsidev->id;
2670 } else {
2671 if (unlikely(scsidev->id || scsidev->lun))
2672 return NULL;
2673 devno = scsidev->channel;
2674 }
2675
2676 return ata_find_dev(ap, devno);
2677 }
2678
2679 /**
2680 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2681 * @ap: ATA port to which the device is attached
2682 * @scsidev: SCSI device from which we derive the ATA device
2683 *
2684 * Given various information provided in struct scsi_cmnd,
2685 * map that onto an ATA bus, and using that mapping
2686 * determine which ata_device is associated with the
2687 * SCSI command to be sent.
2688 *
2689 * LOCKING:
2690 * spin_lock_irqsave(host lock)
2691 *
2692 * RETURNS:
2693 * Associated ATA device, or %NULL if not found.
2694 */
2695 static struct ata_device *
2696 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2697 {
2698 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2699
2700 if (unlikely(!dev || !ata_dev_enabled(dev)))
2701 return NULL;
2702
2703 return dev;
2704 }
2705
2706 /*
2707 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2708 * @byte1: Byte 1 from pass-thru CDB.
2709 *
2710 * RETURNS:
2711 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2712 */
2713 static u8
2714 ata_scsi_map_proto(u8 byte1)
2715 {
2716 switch((byte1 & 0x1e) >> 1) {
2717 case 3: /* Non-data */
2718 return ATA_PROT_NODATA;
2719
2720 case 6: /* DMA */
2721 case 10: /* UDMA Data-in */
2722 case 11: /* UDMA Data-Out */
2723 return ATA_PROT_DMA;
2724
2725 case 4: /* PIO Data-in */
2726 case 5: /* PIO Data-out */
2727 return ATA_PROT_PIO;
2728
2729 case 0: /* Hard Reset */
2730 case 1: /* SRST */
2731 case 8: /* Device Diagnostic */
2732 case 9: /* Device Reset */
2733 case 7: /* DMA Queued */
2734 case 12: /* FPDMA */
2735 case 15: /* Return Response Info */
2736 default: /* Reserved */
2737 break;
2738 }
2739
2740 return ATA_PROT_UNKNOWN;
2741 }
2742
2743 /**
2744 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2745 * @qc: command structure to be initialized
2746 *
2747 * Handles either 12 or 16-byte versions of the CDB.
2748 *
2749 * RETURNS:
2750 * Zero on success, non-zero on failure.
2751 */
2752 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2753 {
2754 struct ata_taskfile *tf = &(qc->tf);
2755 struct scsi_cmnd *scmd = qc->scsicmd;
2756 struct ata_device *dev = qc->dev;
2757 const u8 *cdb = scmd->cmnd;
2758
2759 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2760 goto invalid_fld;
2761
2762 /*
2763 * 12 and 16 byte CDBs use different offsets to
2764 * provide the various register values.
2765 */
2766 if (cdb[0] == ATA_16) {
2767 /*
2768 * 16-byte CDB - may contain extended commands.
2769 *
2770 * If that is the case, copy the upper byte register values.
2771 */
2772 if (cdb[1] & 0x01) {
2773 tf->hob_feature = cdb[3];
2774 tf->hob_nsect = cdb[5];
2775 tf->hob_lbal = cdb[7];
2776 tf->hob_lbam = cdb[9];
2777 tf->hob_lbah = cdb[11];
2778 tf->flags |= ATA_TFLAG_LBA48;
2779 } else
2780 tf->flags &= ~ATA_TFLAG_LBA48;
2781
2782 /*
2783 * Always copy low byte, device and command registers.
2784 */
2785 tf->feature = cdb[4];
2786 tf->nsect = cdb[6];
2787 tf->lbal = cdb[8];
2788 tf->lbam = cdb[10];
2789 tf->lbah = cdb[12];
2790 tf->device = cdb[13];
2791 tf->command = cdb[14];
2792 } else {
2793 /*
2794 * 12-byte CDB - incapable of extended commands.
2795 */
2796 tf->flags &= ~ATA_TFLAG_LBA48;
2797
2798 tf->feature = cdb[3];
2799 tf->nsect = cdb[4];
2800 tf->lbal = cdb[5];
2801 tf->lbam = cdb[6];
2802 tf->lbah = cdb[7];
2803 tf->device = cdb[8];
2804 tf->command = cdb[9];
2805 }
2806
2807 /* enforce correct master/slave bit */
2808 tf->device = dev->devno ?
2809 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2810
2811 /* READ/WRITE LONG use a non-standard sect_size */
2812 qc->sect_size = ATA_SECT_SIZE;
2813 switch (tf->command) {
2814 case ATA_CMD_READ_LONG:
2815 case ATA_CMD_READ_LONG_ONCE:
2816 case ATA_CMD_WRITE_LONG:
2817 case ATA_CMD_WRITE_LONG_ONCE:
2818 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2819 goto invalid_fld;
2820 qc->sect_size = scsi_bufflen(scmd);
2821 }
2822
2823 /*
2824 * Set flags so that all registers will be written, pass on
2825 * write indication (used for PIO/DMA setup), result TF is
2826 * copied back and we don't whine too much about its failure.
2827 */
2828 tf->flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2829 if (scmd->sc_data_direction == DMA_TO_DEVICE)
2830 tf->flags |= ATA_TFLAG_WRITE;
2831
2832 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
2833
2834 /*
2835 * Set transfer length.
2836 *
2837 * TODO: find out if we need to do more here to
2838 * cover scatter/gather case.
2839 */
2840 ata_qc_set_pc_nbytes(qc);
2841
2842 /* We may not issue DMA commands if no DMA mode is set */
2843 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2844 goto invalid_fld;
2845
2846 /* sanity check for pio multi commands */
2847 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
2848 goto invalid_fld;
2849
2850 if (is_multi_taskfile(tf)) {
2851 unsigned int multi_count = 1 << (cdb[1] >> 5);
2852
2853 /* compare the passed through multi_count
2854 * with the cached multi_count of libata
2855 */
2856 if (multi_count != dev->multi_count)
2857 ata_dev_printk(dev, KERN_WARNING,
2858 "invalid multi_count %u ignored\n",
2859 multi_count);
2860 }
2861
2862 /*
2863 * Filter SET_FEATURES - XFER MODE command -- otherwise,
2864 * SET_FEATURES - XFER MODE must be preceded/succeeded
2865 * by an update to hardware-specific registers for each
2866 * controller (i.e. the reason for ->set_piomode(),
2867 * ->set_dmamode(), and ->post_set_mode() hooks).
2868 */
2869 if (tf->command == ATA_CMD_SET_FEATURES &&
2870 tf->feature == SETFEATURES_XFER)
2871 goto invalid_fld;
2872
2873 /*
2874 * Filter TPM commands by default. These provide an
2875 * essentially uncontrolled encrypted "back door" between
2876 * applications and the disk. Set libata.allow_tpm=1 if you
2877 * have a real reason for wanting to use them. This ensures
2878 * that installed software cannot easily mess stuff up without
2879 * user intent. DVR type users will probably ship with this enabled
2880 * for movie content management.
2881 *
2882 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
2883 * for this and should do in future but that it is not sufficient as
2884 * DCS is an optional feature set. Thus we also do the software filter
2885 * so that we comply with the TC consortium stated goal that the user
2886 * can turn off TC features of their system.
2887 */
2888 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
2889 goto invalid_fld;
2890
2891 return 0;
2892
2893 invalid_fld:
2894 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
2895 /* "Invalid field in cdb" */
2896 return 1;
2897 }
2898
2899 /**
2900 * ata_get_xlat_func - check if SCSI to ATA translation is possible
2901 * @dev: ATA device
2902 * @cmd: SCSI command opcode to consider
2903 *
2904 * Look up the SCSI command given, and determine whether the
2905 * SCSI command is to be translated or simulated.
2906 *
2907 * RETURNS:
2908 * Pointer to translation function if possible, %NULL if not.
2909 */
2910
2911 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
2912 {
2913 switch (cmd) {
2914 case READ_6:
2915 case READ_10:
2916 case READ_16:
2917
2918 case WRITE_6:
2919 case WRITE_10:
2920 case WRITE_16:
2921 return ata_scsi_rw_xlat;
2922
2923 case SYNCHRONIZE_CACHE:
2924 if (ata_try_flush_cache(dev))
2925 return ata_scsi_flush_xlat;
2926 break;
2927
2928 case VERIFY:
2929 case VERIFY_16:
2930 return ata_scsi_verify_xlat;
2931
2932 case ATA_12:
2933 case ATA_16:
2934 return ata_scsi_pass_thru;
2935
2936 case START_STOP:
2937 return ata_scsi_start_stop_xlat;
2938 }
2939
2940 return NULL;
2941 }
2942
2943 /**
2944 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
2945 * @ap: ATA port to which the command was being sent
2946 * @cmd: SCSI command to dump
2947 *
2948 * Prints the contents of a SCSI command via printk().
2949 */
2950
2951 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
2952 struct scsi_cmnd *cmd)
2953 {
2954 #ifdef ATA_DEBUG
2955 struct scsi_device *scsidev = cmd->device;
2956 u8 *scsicmd = cmd->cmnd;
2957
2958 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
2959 ap->print_id,
2960 scsidev->channel, scsidev->id, scsidev->lun,
2961 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
2962 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
2963 scsicmd[8]);
2964 #endif
2965 }
2966
2967 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2968 void (*done)(struct scsi_cmnd *),
2969 struct ata_device *dev)
2970 {
2971 u8 scsi_op = scmd->cmnd[0];
2972 ata_xlat_func_t xlat_func;
2973 int rc = 0;
2974
2975 if (dev->class == ATA_DEV_ATA) {
2976 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
2977 goto bad_cdb_len;
2978
2979 xlat_func = ata_get_xlat_func(dev, scsi_op);
2980 } else {
2981 if (unlikely(!scmd->cmd_len))
2982 goto bad_cdb_len;
2983
2984 xlat_func = NULL;
2985 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
2986 /* relay SCSI command to ATAPI device */
2987 int len = COMMAND_SIZE(scsi_op);
2988 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
2989 goto bad_cdb_len;
2990
2991 xlat_func = atapi_xlat;
2992 } else {
2993 /* ATA_16 passthru, treat as an ATA command */
2994 if (unlikely(scmd->cmd_len > 16))
2995 goto bad_cdb_len;
2996
2997 xlat_func = ata_get_xlat_func(dev, scsi_op);
2998 }
2999 }
3000
3001 if (xlat_func)
3002 rc = ata_scsi_translate(dev, scmd, done, xlat_func);
3003 else
3004 ata_scsi_simulate(dev, scmd, done);
3005
3006 return rc;
3007
3008 bad_cdb_len:
3009 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3010 scmd->cmd_len, scsi_op, dev->cdb_len);
3011 scmd->result = DID_ERROR << 16;
3012 done(scmd);
3013 return 0;
3014 }
3015
3016 /**
3017 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3018 * @cmd: SCSI command to be sent
3019 * @done: Completion function, called when command is complete
3020 *
3021 * In some cases, this function translates SCSI commands into
3022 * ATA taskfiles, and queues the taskfiles to be sent to
3023 * hardware. In other cases, this function simulates a
3024 * SCSI device by evaluating and responding to certain
3025 * SCSI commands. This creates the overall effect of
3026 * ATA and ATAPI devices appearing as SCSI devices.
3027 *
3028 * LOCKING:
3029 * Releases scsi-layer-held lock, and obtains host lock.
3030 *
3031 * RETURNS:
3032 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3033 * 0 otherwise.
3034 */
3035 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
3036 {
3037 struct ata_port *ap;
3038 struct ata_device *dev;
3039 struct scsi_device *scsidev = cmd->device;
3040 struct Scsi_Host *shost = scsidev->host;
3041 int rc = 0;
3042
3043 ap = ata_shost_to_port(shost);
3044
3045 spin_unlock(shost->host_lock);
3046 spin_lock(ap->lock);
3047
3048 ata_scsi_dump_cdb(ap, cmd);
3049
3050 dev = ata_scsi_find_dev(ap, scsidev);
3051 if (likely(dev))
3052 rc = __ata_scsi_queuecmd(cmd, done, dev);
3053 else {
3054 cmd->result = (DID_BAD_TARGET << 16);
3055 done(cmd);
3056 }
3057
3058 spin_unlock(ap->lock);
3059 spin_lock(shost->host_lock);
3060 return rc;
3061 }
3062
3063 /**
3064 * ata_scsi_simulate - simulate SCSI command on ATA device
3065 * @dev: the target device
3066 * @cmd: SCSI command being sent to device.
3067 * @done: SCSI command completion function.
3068 *
3069 * Interprets and directly executes a select list of SCSI commands
3070 * that can be handled internally.
3071 *
3072 * LOCKING:
3073 * spin_lock_irqsave(host lock)
3074 */
3075
3076 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
3077 void (*done)(struct scsi_cmnd *))
3078 {
3079 struct ata_scsi_args args;
3080 const u8 *scsicmd = cmd->cmnd;
3081 u8 tmp8;
3082
3083 args.dev = dev;
3084 args.id = dev->id;
3085 args.cmd = cmd;
3086 args.done = done;
3087
3088 switch(scsicmd[0]) {
3089 /* TODO: worth improving? */
3090 case FORMAT_UNIT:
3091 ata_scsi_invalid_field(cmd, done);
3092 break;
3093
3094 case INQUIRY:
3095 if (scsicmd[1] & 2) /* is CmdDt set? */
3096 ata_scsi_invalid_field(cmd, done);
3097 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3098 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3099 else switch (scsicmd[2]) {
3100 case 0x00:
3101 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3102 break;
3103 case 0x80:
3104 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3105 break;
3106 case 0x83:
3107 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3108 break;
3109 case 0x89:
3110 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3111 break;
3112 case 0xb1:
3113 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3114 break;
3115 default:
3116 ata_scsi_invalid_field(cmd, done);
3117 break;
3118 }
3119 break;
3120
3121 case MODE_SENSE:
3122 case MODE_SENSE_10:
3123 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3124 break;
3125
3126 case MODE_SELECT: /* unconditionally return */
3127 case MODE_SELECT_10: /* bad-field-in-cdb */
3128 ata_scsi_invalid_field(cmd, done);
3129 break;
3130
3131 case READ_CAPACITY:
3132 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3133 break;
3134
3135 case SERVICE_ACTION_IN:
3136 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3137 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3138 else
3139 ata_scsi_invalid_field(cmd, done);
3140 break;
3141
3142 case REPORT_LUNS:
3143 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3144 break;
3145
3146 case REQUEST_SENSE:
3147 ata_scsi_set_sense(cmd, 0, 0, 0);
3148 cmd->result = (DRIVER_SENSE << 24);
3149 done(cmd);
3150 break;
3151
3152 /* if we reach this, then writeback caching is disabled,
3153 * turning this into a no-op.
3154 */
3155 case SYNCHRONIZE_CACHE:
3156 /* fall through */
3157
3158 /* no-op's, complete with success */
3159 case REZERO_UNIT:
3160 case SEEK_6:
3161 case SEEK_10:
3162 case TEST_UNIT_READY:
3163 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3164 break;
3165
3166 case SEND_DIAGNOSTIC:
3167 tmp8 = scsicmd[1] & ~(1 << 3);
3168 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3169 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3170 else
3171 ata_scsi_invalid_field(cmd, done);
3172 break;
3173
3174 /* all other commands */
3175 default:
3176 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3177 /* "Invalid command operation code" */
3178 done(cmd);
3179 break;
3180 }
3181 }
3182
3183 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3184 {
3185 int i, rc;
3186
3187 for (i = 0; i < host->n_ports; i++) {
3188 struct ata_port *ap = host->ports[i];
3189 struct Scsi_Host *shost;
3190
3191 rc = -ENOMEM;
3192 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3193 if (!shost)
3194 goto err_alloc;
3195
3196 *(struct ata_port **)&shost->hostdata[0] = ap;
3197 ap->scsi_host = shost;
3198
3199 shost->transportt = &ata_scsi_transport_template;
3200 shost->unique_id = ap->print_id;
3201 shost->max_id = 16;
3202 shost->max_lun = 1;
3203 shost->max_channel = 1;
3204 shost->max_cmd_len = 16;
3205
3206 /* Schedule policy is determined by ->qc_defer()
3207 * callback and it needs to see every deferred qc.
3208 * Set host_blocked to 1 to prevent SCSI midlayer from
3209 * automatically deferring requests.
3210 */
3211 shost->max_host_blocked = 1;
3212
3213 rc = scsi_add_host(ap->scsi_host, ap->host->dev);
3214 if (rc)
3215 goto err_add;
3216 }
3217
3218 return 0;
3219
3220 err_add:
3221 scsi_host_put(host->ports[i]->scsi_host);
3222 err_alloc:
3223 while (--i >= 0) {
3224 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3225
3226 scsi_remove_host(shost);
3227 scsi_host_put(shost);
3228 }
3229 return rc;
3230 }
3231
3232 void ata_scsi_scan_host(struct ata_port *ap, int sync)
3233 {
3234 int tries = 5;
3235 struct ata_device *last_failed_dev = NULL;
3236 struct ata_link *link;
3237 struct ata_device *dev;
3238
3239 if (ap->flags & ATA_FLAG_DISABLED)
3240 return;
3241
3242 repeat:
3243 ata_for_each_link(link, ap, EDGE) {
3244 ata_for_each_dev(dev, link, ENABLED) {
3245 struct scsi_device *sdev;
3246 int channel = 0, id = 0;
3247
3248 if (dev->sdev)
3249 continue;
3250
3251 if (ata_is_host_link(link))
3252 id = dev->devno;
3253 else
3254 channel = link->pmp;
3255
3256 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3257 NULL);
3258 if (!IS_ERR(sdev)) {
3259 dev->sdev = sdev;
3260 scsi_device_put(sdev);
3261 }
3262 }
3263 }
3264
3265 /* If we scanned while EH was in progress or allocation
3266 * failure occurred, scan would have failed silently. Check
3267 * whether all devices are attached.
3268 */
3269 ata_for_each_link(link, ap, EDGE) {
3270 ata_for_each_dev(dev, link, ENABLED) {
3271 if (!dev->sdev)
3272 goto exit_loop;
3273 }
3274 }
3275 exit_loop:
3276 if (!link)
3277 return;
3278
3279 /* we're missing some SCSI devices */
3280 if (sync) {
3281 /* If caller requested synchrnous scan && we've made
3282 * any progress, sleep briefly and repeat.
3283 */
3284 if (dev != last_failed_dev) {
3285 msleep(100);
3286 last_failed_dev = dev;
3287 goto repeat;
3288 }
3289
3290 /* We might be failing to detect boot device, give it
3291 * a few more chances.
3292 */
3293 if (--tries) {
3294 msleep(100);
3295 goto repeat;
3296 }
3297
3298 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan "
3299 "failed without making any progress,\n"
3300 " switching to async\n");
3301 }
3302
3303 queue_delayed_work(ata_aux_wq, &ap->hotplug_task,
3304 round_jiffies_relative(HZ));
3305 }
3306
3307 /**
3308 * ata_scsi_offline_dev - offline attached SCSI device
3309 * @dev: ATA device to offline attached SCSI device for
3310 *
3311 * This function is called from ata_eh_hotplug() and responsible
3312 * for taking the SCSI device attached to @dev offline. This
3313 * function is called with host lock which protects dev->sdev
3314 * against clearing.
3315 *
3316 * LOCKING:
3317 * spin_lock_irqsave(host lock)
3318 *
3319 * RETURNS:
3320 * 1 if attached SCSI device exists, 0 otherwise.
3321 */
3322 int ata_scsi_offline_dev(struct ata_device *dev)
3323 {
3324 if (dev->sdev) {
3325 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3326 return 1;
3327 }
3328 return 0;
3329 }
3330
3331 /**
3332 * ata_scsi_remove_dev - remove attached SCSI device
3333 * @dev: ATA device to remove attached SCSI device for
3334 *
3335 * This function is called from ata_eh_scsi_hotplug() and
3336 * responsible for removing the SCSI device attached to @dev.
3337 *
3338 * LOCKING:
3339 * Kernel thread context (may sleep).
3340 */
3341 static void ata_scsi_remove_dev(struct ata_device *dev)
3342 {
3343 struct ata_port *ap = dev->link->ap;
3344 struct scsi_device *sdev;
3345 unsigned long flags;
3346
3347 /* Alas, we need to grab scan_mutex to ensure SCSI device
3348 * state doesn't change underneath us and thus
3349 * scsi_device_get() always succeeds. The mutex locking can
3350 * be removed if there is __scsi_device_get() interface which
3351 * increments reference counts regardless of device state.
3352 */
3353 mutex_lock(&ap->scsi_host->scan_mutex);
3354 spin_lock_irqsave(ap->lock, flags);
3355
3356 /* clearing dev->sdev is protected by host lock */
3357 sdev = dev->sdev;
3358 dev->sdev = NULL;
3359
3360 if (sdev) {
3361 /* If user initiated unplug races with us, sdev can go
3362 * away underneath us after the host lock and
3363 * scan_mutex are released. Hold onto it.
3364 */
3365 if (scsi_device_get(sdev) == 0) {
3366 /* The following ensures the attached sdev is
3367 * offline on return from ata_scsi_offline_dev()
3368 * regardless it wins or loses the race
3369 * against this function.
3370 */
3371 scsi_device_set_state(sdev, SDEV_OFFLINE);
3372 } else {
3373 WARN_ON(1);
3374 sdev = NULL;
3375 }
3376 }
3377
3378 spin_unlock_irqrestore(ap->lock, flags);
3379 mutex_unlock(&ap->scsi_host->scan_mutex);
3380
3381 if (sdev) {
3382 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
3383 dev_name(&sdev->sdev_gendev));
3384
3385 scsi_remove_device(sdev);
3386 scsi_device_put(sdev);
3387 }
3388 }
3389
3390 static void ata_scsi_handle_link_detach(struct ata_link *link)
3391 {
3392 struct ata_port *ap = link->ap;
3393 struct ata_device *dev;
3394
3395 ata_for_each_dev(dev, link, ALL) {
3396 unsigned long flags;
3397
3398 if (!(dev->flags & ATA_DFLAG_DETACHED))
3399 continue;
3400
3401 spin_lock_irqsave(ap->lock, flags);
3402 dev->flags &= ~ATA_DFLAG_DETACHED;
3403 spin_unlock_irqrestore(ap->lock, flags);
3404
3405 ata_scsi_remove_dev(dev);
3406 }
3407 }
3408
3409 /**
3410 * ata_scsi_media_change_notify - send media change event
3411 * @dev: Pointer to the disk device with media change event
3412 *
3413 * Tell the block layer to send a media change notification
3414 * event.
3415 *
3416 * LOCKING:
3417 * spin_lock_irqsave(host lock)
3418 */
3419 void ata_scsi_media_change_notify(struct ata_device *dev)
3420 {
3421 if (dev->sdev)
3422 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3423 GFP_ATOMIC);
3424 }
3425
3426 /**
3427 * ata_scsi_hotplug - SCSI part of hotplug
3428 * @work: Pointer to ATA port to perform SCSI hotplug on
3429 *
3430 * Perform SCSI part of hotplug. It's executed from a separate
3431 * workqueue after EH completes. This is necessary because SCSI
3432 * hot plugging requires working EH and hot unplugging is
3433 * synchronized with hot plugging with a mutex.
3434 *
3435 * LOCKING:
3436 * Kernel thread context (may sleep).
3437 */
3438 void ata_scsi_hotplug(struct work_struct *work)
3439 {
3440 struct ata_port *ap =
3441 container_of(work, struct ata_port, hotplug_task.work);
3442 int i;
3443
3444 if (ap->pflags & ATA_PFLAG_UNLOADING) {
3445 DPRINTK("ENTER/EXIT - unloading\n");
3446 return;
3447 }
3448
3449 DPRINTK("ENTER\n");
3450
3451 /* Unplug detached devices. We cannot use link iterator here
3452 * because PMP links have to be scanned even if PMP is
3453 * currently not attached. Iterate manually.
3454 */
3455 ata_scsi_handle_link_detach(&ap->link);
3456 if (ap->pmp_link)
3457 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3458 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3459
3460 /* scan for new ones */
3461 ata_scsi_scan_host(ap, 0);
3462
3463 DPRINTK("EXIT\n");
3464 }
3465
3466 /**
3467 * ata_scsi_user_scan - indication for user-initiated bus scan
3468 * @shost: SCSI host to scan
3469 * @channel: Channel to scan
3470 * @id: ID to scan
3471 * @lun: LUN to scan
3472 *
3473 * This function is called when user explicitly requests bus
3474 * scan. Set probe pending flag and invoke EH.
3475 *
3476 * LOCKING:
3477 * SCSI layer (we don't care)
3478 *
3479 * RETURNS:
3480 * Zero.
3481 */
3482 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3483 unsigned int id, unsigned int lun)
3484 {
3485 struct ata_port *ap = ata_shost_to_port(shost);
3486 unsigned long flags;
3487 int devno, rc = 0;
3488
3489 if (!ap->ops->error_handler)
3490 return -EOPNOTSUPP;
3491
3492 if (lun != SCAN_WILD_CARD && lun)
3493 return -EINVAL;
3494
3495 if (!sata_pmp_attached(ap)) {
3496 if (channel != SCAN_WILD_CARD && channel)
3497 return -EINVAL;
3498 devno = id;
3499 } else {
3500 if (id != SCAN_WILD_CARD && id)
3501 return -EINVAL;
3502 devno = channel;
3503 }
3504
3505 spin_lock_irqsave(ap->lock, flags);
3506
3507 if (devno == SCAN_WILD_CARD) {
3508 struct ata_link *link;
3509
3510 ata_for_each_link(link, ap, EDGE) {
3511 struct ata_eh_info *ehi = &link->eh_info;
3512 ehi->probe_mask |= ATA_ALL_DEVICES;
3513 ehi->action |= ATA_EH_RESET;
3514 }
3515 } else {
3516 struct ata_device *dev = ata_find_dev(ap, devno);
3517
3518 if (dev) {
3519 struct ata_eh_info *ehi = &dev->link->eh_info;
3520 ehi->probe_mask |= 1 << dev->devno;
3521 ehi->action |= ATA_EH_RESET;
3522 } else
3523 rc = -EINVAL;
3524 }
3525
3526 if (rc == 0) {
3527 ata_port_schedule_eh(ap);
3528 spin_unlock_irqrestore(ap->lock, flags);
3529 ata_port_wait_eh(ap);
3530 } else
3531 spin_unlock_irqrestore(ap->lock, flags);
3532
3533 return rc;
3534 }
3535
3536 /**
3537 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3538 * @work: Pointer to ATA port to perform scsi_rescan_device()
3539 *
3540 * After ATA pass thru (SAT) commands are executed successfully,
3541 * libata need to propagate the changes to SCSI layer. This
3542 * function must be executed from ata_aux_wq such that sdev
3543 * attach/detach don't race with rescan.
3544 *
3545 * LOCKING:
3546 * Kernel thread context (may sleep).
3547 */
3548 void ata_scsi_dev_rescan(struct work_struct *work)
3549 {
3550 struct ata_port *ap =
3551 container_of(work, struct ata_port, scsi_rescan_task);
3552 struct ata_link *link;
3553 struct ata_device *dev;
3554 unsigned long flags;
3555
3556 spin_lock_irqsave(ap->lock, flags);
3557
3558 ata_for_each_link(link, ap, EDGE) {
3559 ata_for_each_dev(dev, link, ENABLED) {
3560 struct scsi_device *sdev = dev->sdev;
3561
3562 if (!sdev)
3563 continue;
3564 if (scsi_device_get(sdev))
3565 continue;
3566
3567 spin_unlock_irqrestore(ap->lock, flags);
3568 scsi_rescan_device(&(sdev->sdev_gendev));
3569 scsi_device_put(sdev);
3570 spin_lock_irqsave(ap->lock, flags);
3571 }
3572 }
3573
3574 spin_unlock_irqrestore(ap->lock, flags);
3575 }
3576
3577 /**
3578 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3579 * @host: ATA host container for all SAS ports
3580 * @port_info: Information from low-level host driver
3581 * @shost: SCSI host that the scsi device is attached to
3582 *
3583 * LOCKING:
3584 * PCI/etc. bus probe sem.
3585 *
3586 * RETURNS:
3587 * ata_port pointer on success / NULL on failure.
3588 */
3589
3590 struct ata_port *ata_sas_port_alloc(struct ata_host *host,
3591 struct ata_port_info *port_info,
3592 struct Scsi_Host *shost)
3593 {
3594 struct ata_port *ap;
3595
3596 ap = ata_port_alloc(host);
3597 if (!ap)
3598 return NULL;
3599
3600 ap->port_no = 0;
3601 ap->lock = shost->host_lock;
3602 ap->pio_mask = port_info->pio_mask;
3603 ap->mwdma_mask = port_info->mwdma_mask;
3604 ap->udma_mask = port_info->udma_mask;
3605 ap->flags |= port_info->flags;
3606 ap->ops = port_info->port_ops;
3607 ap->cbl = ATA_CBL_SATA;
3608
3609 return ap;
3610 }
3611 EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3612
3613 /**
3614 * ata_sas_port_start - Set port up for dma.
3615 * @ap: Port to initialize
3616 *
3617 * Called just after data structures for each port are
3618 * initialized.
3619 *
3620 * May be used as the port_start() entry in ata_port_operations.
3621 *
3622 * LOCKING:
3623 * Inherited from caller.
3624 */
3625 int ata_sas_port_start(struct ata_port *ap)
3626 {
3627 return 0;
3628 }
3629 EXPORT_SYMBOL_GPL(ata_sas_port_start);
3630
3631 /**
3632 * ata_port_stop - Undo ata_sas_port_start()
3633 * @ap: Port to shut down
3634 *
3635 * May be used as the port_stop() entry in ata_port_operations.
3636 *
3637 * LOCKING:
3638 * Inherited from caller.
3639 */
3640
3641 void ata_sas_port_stop(struct ata_port *ap)
3642 {
3643 }
3644 EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3645
3646 /**
3647 * ata_sas_port_init - Initialize a SATA device
3648 * @ap: SATA port to initialize
3649 *
3650 * LOCKING:
3651 * PCI/etc. bus probe sem.
3652 *
3653 * RETURNS:
3654 * Zero on success, non-zero on error.
3655 */
3656
3657 int ata_sas_port_init(struct ata_port *ap)
3658 {
3659 int rc = ap->ops->port_start(ap);
3660
3661 if (!rc) {
3662 ap->print_id = ata_print_id++;
3663 rc = ata_bus_probe(ap);
3664 }
3665
3666 return rc;
3667 }
3668 EXPORT_SYMBOL_GPL(ata_sas_port_init);
3669
3670 /**
3671 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3672 * @ap: SATA port to destroy
3673 *
3674 */
3675
3676 void ata_sas_port_destroy(struct ata_port *ap)
3677 {
3678 if (ap->ops->port_stop)
3679 ap->ops->port_stop(ap);
3680 kfree(ap);
3681 }
3682 EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3683
3684 /**
3685 * ata_sas_slave_configure - Default slave_config routine for libata devices
3686 * @sdev: SCSI device to configure
3687 * @ap: ATA port to which SCSI device is attached
3688 *
3689 * RETURNS:
3690 * Zero.
3691 */
3692
3693 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
3694 {
3695 ata_scsi_sdev_config(sdev);
3696 ata_scsi_dev_config(sdev, ap->link.device);
3697 return 0;
3698 }
3699 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3700
3701 /**
3702 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3703 * @cmd: SCSI command to be sent
3704 * @done: Completion function, called when command is complete
3705 * @ap: ATA port to which the command is being sent
3706 *
3707 * RETURNS:
3708 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3709 * 0 otherwise.
3710 */
3711
3712 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
3713 struct ata_port *ap)
3714 {
3715 int rc = 0;
3716
3717 ata_scsi_dump_cdb(ap, cmd);
3718
3719 if (likely(ata_dev_enabled(ap->link.device)))
3720 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device);
3721 else {
3722 cmd->result = (DID_BAD_TARGET << 16);
3723 done(cmd);
3724 }
3725 return rc;
3726 }
3727 EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
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