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