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