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[SCSI] ibmvfc: Fix errors due to inconsistent command data
[net-next-2.6.git] / drivers / ata / libata-scsi.c
CommitLineData
1da177e4 1/*
af36d7f0
JG		 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 *
1da177e4
LT		 34 */
35
36#include <linux/kernel.h>
37#include <linux/blkdev.h>
38#include <linux/spinlock.h>
39#include <scsi/scsi.h>
1da177e4 40#include <scsi/scsi_host.h>
beb40487 41#include <scsi/scsi_cmnd.h>
85837ebd 42#include <scsi/scsi_eh.h>
005a5a06 43#include <scsi/scsi_device.h>
a6e6ce8e 44#include <scsi/scsi_tcq.h>
30afc84c 45#include <scsi/scsi_transport.h>
1da177e4 46#include <linux/libata.h>
b095518e 47#include <linux/hdreg.h>
2dcb407e 48#include <linux/uaccess.h>
1da177e4
LT		 49
50#include "libata.h"
51
87340e98
TH		 52#define SECTOR_SIZE 512
53#define ATA_SCSI_RBUF_SIZE 4096
54
55static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
56static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
b095518e 57
ad706991 58typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
ab5b3a5b 59
2dcb407e 60static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
ab5b3a5b 61 const struct scsi_device *scsidev);
2dcb407e 62static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
ab5b3a5b 63 const struct scsi_device *scsidev);
83c47bcb
TH		 64static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
65 unsigned int id, unsigned int lun);
ab5b3a5b 66
1da177e4 67
00ac37f5
DG		 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
24f75686 78static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
00ac37f5
DG		 79 RW_RECOVERY_MPAGE,
80 RW_RECOVERY_MPAGE_LEN - 2,
24f75686 81 (1 << 7), /* AWRE */
00ac37f5
DG		 82 0, /* read retry count */
83 0, 0, 0, 0,
84 0, /* write retry count */
85 0, 0, 0
86};
87
88static 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
97static 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
30afc84c
TH		 106/*
107 * libata transport template. libata doesn't do real transport stuff.
108 * It just needs the eh_timed_out hook.
109 */
f3187195 110static struct scsi_transport_template ata_scsi_transport_template = {
9227c33d 111 .eh_strategy_handler = ata_scsi_error,
30afc84c 112 .eh_timed_out = ata_scsi_timed_out,
ccf68c34 113 .user_scan = ata_scsi_user_scan,
30afc84c
TH		 114};
115
1da177e4 116
ca77329f
KCA		 117static 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
a2d6ed14 127static const char *ata_scsi_lpm_get(enum link_pm policy)
ca77329f
KCA		 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
ee959b00
TJ		 138static ssize_t ata_scsi_lpm_put(struct device *dev,
139 struct device_attribute *attr,
140 const char *buf, size_t count)
ca77329f 141{
ee959b00 142 struct Scsi_Host *shost = class_to_shost(dev);
ca77329f
KCA		 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
169static ssize_t
ee959b00 170ata_scsi_lpm_show(struct device *dev, struct device_attribute *attr, char *buf)
ca77329f 171{
ee959b00 172 struct Scsi_Host *shost = class_to_shost(dev);
ca77329f
KCA		 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}
ee959b00 182DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
ca77329f 183 ata_scsi_lpm_show, ata_scsi_lpm_put);
ee959b00 184EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
ca77329f 185
45fabbb7
EO		 186static 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;
a464189d 193 unsigned long flags, now;
45fabbb7
EO		 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;
a464189d 211 now = jiffies;
45fabbb7
EO		 212 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
213 link->eh_context.unloaded_mask & (1 << dev->devno) &&
a464189d
EO		 214 time_after(dev->unpark_deadline, now))
215 msecs = jiffies_to_msecs(dev->unpark_deadline - now);
45fabbb7
EO		 216 else
217 msecs = 0;
218
219unlock:
220 spin_unlock_irq(ap->lock);
221
222 return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
223}
224
225static ssize_t ata_scsi_park_store(struct device *device,
226 struct device_attribute *attr,
227 const char *buf, size_t len)
228{
229 struct scsi_device *sdev = to_scsi_device(device);
230 struct ata_port *ap;
231 struct ata_device *dev;
232 long int input;
233 unsigned long flags;
234 int rc;
235
236 rc = strict_strtol(buf, 10, &input);
237 if (rc || input < -2)
238 return -EINVAL;
239 if (input > ATA_TMOUT_MAX_PARK) {
240 rc = -EOVERFLOW;
241 input = ATA_TMOUT_MAX_PARK;
242 }
243
244 ap = ata_shost_to_port(sdev->host);
245
246 spin_lock_irqsave(ap->lock, flags);
247 dev = ata_scsi_find_dev(ap, sdev);
248 if (unlikely(!dev)) {
249 rc = -ENODEV;
250 goto unlock;
251 }
252 if (dev->class != ATA_DEV_ATA) {
253 rc = -EOPNOTSUPP;
254 goto unlock;
255 }
256
257 if (input >= 0) {
258 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
259 rc = -EOPNOTSUPP;
260 goto unlock;
261 }
262
263 dev->unpark_deadline = ata_deadline(jiffies, input);
264 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
265 ata_port_schedule_eh(ap);
266 complete(&ap->park_req_pending);
267 } else {
268 switch (input) {
269 case -1:
270 dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
271 break;
272 case -2:
273 dev->flags |= ATA_DFLAG_NO_UNLOAD;
274 break;
275 }
276 }
277unlock:
278 spin_unlock_irqrestore(ap->lock, flags);
279
280 return rc ? rc : len;
281}
282DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
283 ata_scsi_park_show, ata_scsi_park_store);
284EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
285
f0761be3
TH		 286static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
287{
288 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
289
290 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
291}
292
18f7ba4c
KCA		 293static ssize_t
294ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
295 const char *buf, size_t count)
296{
297 struct Scsi_Host *shost = class_to_shost(dev);
298 struct ata_port *ap = ata_shost_to_port(shost);
299 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
300 return ap->ops->em_store(ap, buf, count);
301 return -EINVAL;
302}
303
304static ssize_t
305ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
306 char *buf)
307{
308 struct Scsi_Host *shost = class_to_shost(dev);
309 struct ata_port *ap = ata_shost_to_port(shost);
310
311 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
312 return ap->ops->em_show(ap, buf);
313 return -EINVAL;
314}
315DEVICE_ATTR(em_message, S_IRUGO | S_IWUGO,
316 ata_scsi_em_message_show, ata_scsi_em_message_store);
317EXPORT_SYMBOL_GPL(dev_attr_em_message);
318
319static ssize_t
320ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
321 char *buf)
322{
323 struct Scsi_Host *shost = class_to_shost(dev);
324 struct ata_port *ap = ata_shost_to_port(shost);
325
326 return snprintf(buf, 23, "%d\n", ap->em_message_type);
327}
328DEVICE_ATTR(em_message_type, S_IRUGO,
329 ata_scsi_em_message_type_show, NULL);
330EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
331
332static ssize_t
333ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
334 char *buf)
335{
336 struct scsi_device *sdev = to_scsi_device(dev);
337 struct ata_port *ap = ata_shost_to_port(sdev->host);
338 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
339
340 if (ap->ops->sw_activity_show && (ap->flags & ATA_FLAG_SW_ACTIVITY))
341 return ap->ops->sw_activity_show(atadev, buf);
342 return -EINVAL;
343}
344
345static ssize_t
346ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
347 const char *buf, size_t count)
348{
349 struct scsi_device *sdev = to_scsi_device(dev);
350 struct ata_port *ap = ata_shost_to_port(sdev->host);
351 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
352 enum sw_activity val;
353 int rc;
354
355 if (ap->ops->sw_activity_store && (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
356 val = simple_strtoul(buf, NULL, 0);
357 switch (val) {
358 case OFF: case BLINK_ON: case BLINK_OFF:
359 rc = ap->ops->sw_activity_store(atadev, val);
360 if (!rc)
361 return count;
362 else
363 return rc;
364 }
365 }
366 return -EINVAL;
367}
368DEVICE_ATTR(sw_activity, S_IWUGO | S_IRUGO, ata_scsi_activity_show,
369 ata_scsi_activity_store);
370EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
371
45fabbb7
EO		 372struct device_attribute *ata_common_sdev_attrs[] = {
373 &dev_attr_unload_heads,
374 NULL
375};
376EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
377
ae006510
DG		 378static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
379 void (*done)(struct scsi_cmnd *))
380{
381 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
382 /* "Invalid field in cbd" */
383 done(cmd);
384}
385
1da177e4
LT		 386/**
387 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
388 * @sdev: SCSI device for which BIOS geometry is to be determined
389 * @bdev: block device associated with @sdev
390 * @capacity: capacity of SCSI device
391 * @geom: location to which geometry will be output
392 *
393 * Generic bios head/sector/cylinder calculator
394 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
395 * mapping. Some situations may arise where the disk is not
396 * bootable if this is not used.
397 *
398 * LOCKING:
399 * Defined by the SCSI layer. We don't really care.
400 *
401 * RETURNS:
402 * Zero.
403 */
404int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
405 sector_t capacity, int geom[])
406{
407 geom[0] = 255;
408 geom[1] = 63;
409 sector_div(capacity, 255*63);
410 geom[2] = capacity;
411
412 return 0;
413}
414
5924b74c
TH		 415/**
416 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
417 * @sdev: SCSI device to get identify data for
418 * @arg: User buffer area for identify data
419 *
420 * LOCKING:
421 * Defined by the SCSI layer. We don't really care.
422 *
423 * RETURNS:
424 * Zero on success, negative errno on error.
425 */
426static int ata_get_identity(struct scsi_device *sdev, void __user *arg)
427{
428 struct ata_port *ap = ata_shost_to_port(sdev->host);
429 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
430 u16 __user *dst = arg;
431 char buf[40];
432
433 if (!dev)
434 return -ENOMSG;
435
436 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
437 return -EFAULT;
438
439 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
440 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
441 return -EFAULT;
442
443 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
444 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
445 return -EFAULT;
446
447 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
448 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
449 return -EFAULT;
450
451 return 0;
452}
453
b095518e
JG		 454/**
455 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
8e8b77dd 456 * @scsidev: Device to which we are issuing command
b095518e
JG		 457 * @arg: User provided data for issuing command
458 *
459 * LOCKING:
460 * Defined by the SCSI layer. We don't really care.
461 *
462 * RETURNS:
463 * Zero on success, negative errno on error.
464 */
b095518e
JG		 465int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
466{
467 int rc = 0;
468 u8 scsi_cmd[MAX_COMMAND_SIZE];
bbe1fe7e 469 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
b095518e 470 int argsize = 0;
85837ebd 471 enum dma_data_direction data_dir;
bbe1fe7e 472 int cmd_result;
b095518e 473
c893a3ae 474 if (arg == NULL)
b095518e
JG		 475 return -EINVAL;
476
477 if (copy_from_user(args, arg, sizeof(args)))
478 return -EFAULT;
479
bbe1fe7e
ET		 480 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
481 if (!sensebuf)
482 return -ENOMEM;
483
b095518e
JG		 484 memset(scsi_cmd, 0, sizeof(scsi_cmd));
485
486 if (args[3]) {
487 argsize = SECTOR_SIZE * args[3];
488 argbuf = kmalloc(argsize, GFP_KERNEL);
54dac83c
JR		 489 if (argbuf == NULL) {
490 rc = -ENOMEM;
491 goto error;
492 }
b095518e
JG		 493
494 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
495 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
2dcb407e 496 block count in sector count field */
85837ebd 497 data_dir = DMA_FROM_DEVICE;
b095518e
JG		 498 } else {
499 scsi_cmd[1] = (3 << 1); /* Non-data */
bbe1fe7e 500 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
85837ebd 501 data_dir = DMA_NONE;
b095518e
JG		 502 }
503
504 scsi_cmd[0] = ATA_16;
505
506 scsi_cmd[4] = args[2];
a4f19040 507 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
b095518e
JG		 508 scsi_cmd[6] = args[3];
509 scsi_cmd[8] = args[1];
510 scsi_cmd[10] = 0x4f;
511 scsi_cmd[12] = 0xc2;
512 } else {
513 scsi_cmd[6] = args[1];
514 }
515 scsi_cmd[14] = args[0];
516
517 /* Good values for timeout and retries? Values below
518 from scsi_ioctl_send_command() for default case... */
bbe1fe7e 519 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
2dcb407e 520 sensebuf, (10*HZ), 5, 0);
bbe1fe7e
ET		 521
522 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
523 u8 *desc = sensebuf + 8;
524 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
525
526 /* If we set cc then ATA pass-through will cause a
527 * check condition even if no error. Filter that. */
528 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
529 struct scsi_sense_hdr sshdr;
530 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
2dcb407e
JG		 531 &sshdr);
532 if (sshdr.sense_key == 0 &&
533 sshdr.asc == 0 && sshdr.ascq == 0)
bbe1fe7e
ET		 534 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
535 }
536
537 /* Send userspace a few ATA registers (same as drivers/ide) */
2dcb407e
JG		 538 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
539 desc[0] == 0x09) { /* code is "ATA Descriptor" */
540 args[0] = desc[13]; /* status */
541 args[1] = desc[3]; /* error */
542 args[2] = desc[5]; /* sector count (0:7) */
bbe1fe7e
ET		 543 if (copy_to_user(arg, args, sizeof(args)))
544 rc = -EFAULT;
545 }
546 }
547
548
549 if (cmd_result) {
b095518e
JG		 550 rc = -EIO;
551 goto error;
552 }
553
b095518e 554 if ((argbuf)
c893a3ae 555 && copy_to_user(arg + sizeof(args), argbuf, argsize))
b095518e
JG		 556 rc = -EFAULT;
557error:
bbe1fe7e 558 kfree(sensebuf);
8f760780 559 kfree(argbuf);
b095518e
JG		 560 return rc;
561}
562
563/**
564 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
8e8b77dd 565 * @scsidev: Device to which we are issuing command
b095518e
JG		 566 * @arg: User provided data for issuing command
567 *
568 * LOCKING:
569 * Defined by the SCSI layer. We don't really care.
570 *
571 * RETURNS:
572 * Zero on success, negative errno on error.
573 */
574int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
575{
576 int rc = 0;
577 u8 scsi_cmd[MAX_COMMAND_SIZE];
af068bd1
DM		 578 u8 args[7], *sensebuf = NULL;
579 int cmd_result;
b095518e 580
c893a3ae 581 if (arg == NULL)
b095518e
JG		 582 return -EINVAL;
583
584 if (copy_from_user(args, arg, sizeof(args)))
585 return -EFAULT;
586
af068bd1
DM		 587 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
588 if (!sensebuf)
589 return -ENOMEM;
590
b095518e
JG		 591 memset(scsi_cmd, 0, sizeof(scsi_cmd));
592 scsi_cmd[0] = ATA_16;
593 scsi_cmd[1] = (3 << 1); /* Non-data */
af068bd1 594 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
b095518e
JG		 595 scsi_cmd[4] = args[1];
596 scsi_cmd[6] = args[2];
597 scsi_cmd[8] = args[3];
598 scsi_cmd[10] = args[4];
599 scsi_cmd[12] = args[5];
277239f2 600 scsi_cmd[13] = args[6] & 0x4f;
b095518e
JG		 601 scsi_cmd[14] = args[0];
602
b095518e 603 /* Good values for timeout and retries? Values below
2e9edbf8 604 from scsi_ioctl_send_command() for default case... */
af068bd1
DM		 605 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
606 sensebuf, (10*HZ), 5, 0);
607
608 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
609 u8 *desc = sensebuf + 8;
610 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
611
612 /* If we set cc then ATA pass-through will cause a
613 * check condition even if no error. Filter that. */
614 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
615 struct scsi_sense_hdr sshdr;
616 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
617 &sshdr);
2dcb407e
JG		 618 if (sshdr.sense_key == 0 &&
619 sshdr.asc == 0 && sshdr.ascq == 0)
af068bd1
DM		 620 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
621 }
622
623 /* Send userspace ATA registers */
624 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
625 desc[0] == 0x09) {/* code is "ATA Descriptor" */
626 args[0] = desc[13]; /* status */
627 args[1] = desc[3]; /* error */
628 args[2] = desc[5]; /* sector count (0:7) */
629 args[3] = desc[7]; /* lbal */
630 args[4] = desc[9]; /* lbam */
631 args[5] = desc[11]; /* lbah */
632 args[6] = desc[12]; /* select */
633 if (copy_to_user(arg, args, sizeof(args)))
634 rc = -EFAULT;
635 }
636 }
637
638 if (cmd_result) {
b095518e 639 rc = -EIO;
af068bd1
DM		 640 goto error;
641 }
b095518e 642
af068bd1
DM		 643 error:
644 kfree(sensebuf);
b095518e
JG		 645 return rc;
646}
647
1da177e4
LT		 648int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
649{
1da177e4
LT		 650 int val = -EINVAL, rc = -EINVAL;
651
1da177e4
LT		 652 switch (cmd) {
653 case ATA_IOC_GET_IO32:
654 val = 0;
655 if (copy_to_user(arg, &val, 1))
656 return -EFAULT;
657 return 0;
658
659 case ATA_IOC_SET_IO32:
660 val = (unsigned long) arg;
661 if (val != 0)
662 return -EINVAL;
663 return 0;
664
5924b74c
TH		 665 case HDIO_GET_IDENTITY:
666 return ata_get_identity(scsidev, arg);
667
b095518e
JG		 668 case HDIO_DRIVE_CMD:
669 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
670 return -EACCES;
671 return ata_cmd_ioctl(scsidev, arg);
672
673 case HDIO_DRIVE_TASK:
674 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
675 return -EACCES;
676 return ata_task_ioctl(scsidev, arg);
677
1da177e4
LT		 678 default:
679 rc = -ENOTTY;
680 break;
681 }
682
1da177e4
LT		 683 return rc;
684}
685
686/**
687 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
1da177e4
LT		 688 * @dev: ATA device to which the new command is attached
689 * @cmd: SCSI command that originated this ATA command
690 * @done: SCSI command completion function
691 *
692 * Obtain a reference to an unused ata_queued_cmd structure,
693 * which is the basic libata structure representing a single
694 * ATA command sent to the hardware.
695 *
696 * If a command was available, fill in the SCSI-specific
697 * portions of the structure with information on the
698 * current command.
699 *
700 * LOCKING:
cca3974e 701 * spin_lock_irqsave(host lock)
1da177e4
LT		 702 *
703 * RETURNS:
704 * Command allocated, or %NULL if none available.
705 */
7102d230
AB		 706static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
707 struct scsi_cmnd *cmd,
708 void (*done)(struct scsi_cmnd *))
1da177e4
LT		 709{
710 struct ata_queued_cmd *qc;
711
8a8bc223 712 qc = ata_qc_new_init(dev);
1da177e4
LT		 713 if (qc) {
714 qc->scsicmd = cmd;
715 qc->scsidone = done;
716
ff2aeb1e 717 qc->sg = scsi_sglist(cmd);
7120165c 718 qc->n_elem = scsi_sg_count(cmd);
1da177e4
LT		 719 } else {
720 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
721 done(cmd);
722 }
723
724 return qc;
725}
726
aacda375
TH		 727static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
728{
729 struct scsi_cmnd *scmd = qc->scsicmd;
730
731 qc->extrabytes = scmd->request->extra_len;
732 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
733}
734
b095518e
JG		 735/**
736 * ata_dump_status - user friendly display of error info
737 * @id: id of the port in question
738 * @tf: ptr to filled out taskfile
739 *
740 * Decode and dump the ATA error/status registers for the user so
741 * that they have some idea what really happened at the non
742 * make-believe layer.
743 *
744 * LOCKING:
745 * inherited from caller
746 */
7102d230 747static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
b095518e
JG		 748{
749 u8 stat = tf->command, err = tf->feature;
750
751 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
752 if (stat & ATA_BUSY) {
753 printk("Busy }\n"); /* Data is not valid in this case */
754 } else {
755 if (stat & 0x40) printk("DriveReady ");
756 if (stat & 0x20) printk("DeviceFault ");
757 if (stat & 0x10) printk("SeekComplete ");
758 if (stat & 0x08) printk("DataRequest ");
759 if (stat & 0x04) printk("CorrectedError ");
760 if (stat & 0x02) printk("Index ");
761 if (stat & 0x01) printk("Error ");
762 printk("}\n");
763
764 if (err) {
765 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
766 if (err & 0x04) printk("DriveStatusError ");
767 if (err & 0x80) {
768 if (err & 0x04) printk("BadCRC ");
769 else printk("Sector ");
770 }
771 if (err & 0x40) printk("UncorrectableError ");
772 if (err & 0x10) printk("SectorIdNotFound ");
773 if (err & 0x02) printk("TrackZeroNotFound ");
774 if (err & 0x01) printk("AddrMarkNotFound ");
775 printk("}\n");
776 }
777 }
778}
779
1da177e4
LT		 780/**
781 * ata_to_sense_error - convert ATA error to SCSI error
8e8b77dd 782 * @id: ATA device number
1da177e4 783 * @drv_stat: value contained in ATA status register
b095518e
JG		 784 * @drv_err: value contained in ATA error register
785 * @sk: the sense key we'll fill out
786 * @asc: the additional sense code we'll fill out
787 * @ascq: the additional sense code qualifier we'll fill out
246619da 788 * @verbose: be verbose
1da177e4 789 *
b095518e
JG		 790 * Converts an ATA error into a SCSI error. Fill out pointers to
791 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
792 * format sense blocks.
1da177e4
LT		 793 *
794 * LOCKING:
cca3974e 795 * spin_lock_irqsave(host lock)
1da177e4 796 */
7102d230
AB		 797static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
798 u8 *asc, u8 *ascq, int verbose)
1da177e4 799{
b095518e 800 int i;
ffe75ef6 801
1da177e4 802 /* Based on the 3ware driver translation table */
98ac62de 803 static const unsigned char sense_table[][4] = {
1da177e4
LT		 804 /* BBD|ECC|ID|MAR */
805 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
806 /* BBD|ECC|ID */
807 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
808 /* ECC|MC|MARK */
809 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
810 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
811 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
812 /* MC|ID|ABRT|TRK0|MARK */
813 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
814 /* MCR|MARK */
815 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
816 /* Bad address mark */
817 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
818 /* TRK0 */
819 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
820 /* Abort & !ICRC */
821 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
822 /* Media change request */
823 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
824 /* SRV */
825 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
826 /* Media change */
827 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
828 /* ECC */
829 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
830 /* BBD - block marked bad */
831 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
832 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
833 };
98ac62de 834 static const unsigned char stat_table[][4] = {
1da177e4
LT		 835 /* Must be first because BUSY means no other bits valid */
836 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
837 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
838 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
839 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
840 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
841 };
1da177e4 842
1da177e4
LT		 843 /*
844 * Is this an error we can process/parse
845 */
b095518e
JG		 846 if (drv_stat & ATA_BUSY) {
847 drv_err = 0; /* Ignore the err bits, they're invalid */
1da177e4 848 }
b095518e
JG		 849
850 if (drv_err) {
851 /* Look for drv_err */
852 for (i = 0; sense_table[i][0] != 0xFF; i++) {
853 /* Look for best matches first */
2e9edbf8 854 if ((sense_table[i][0] & drv_err) ==
b095518e
JG		 855 sense_table[i][0]) {
856 *sk = sense_table[i][1];
857 *asc = sense_table[i][2];
858 *ascq = sense_table[i][3];
859 goto translate_done;
860 }
861 }
862 /* No immediate match */
246619da
TH		 863 if (verbose)
864 printk(KERN_WARNING "ata%u: no sense translation for "
865 "error 0x%02x\n", id, drv_err);
1da177e4 866 }
b095518e
JG		 867
868 /* Fall back to interpreting status bits */
869 for (i = 0; stat_table[i][0] != 0xFF; i++) {
870 if (stat_table[i][0] & drv_stat) {
871 *sk = stat_table[i][1];
872 *asc = stat_table[i][2];
873 *ascq = stat_table[i][3];
874 goto translate_done;
1da177e4 875 }
b095518e
JG		 876 }
877 /* No error? Undecoded? */
246619da
TH		 878 if (verbose)
879 printk(KERN_WARNING "ata%u: no sense translation for "
880 "status: 0x%02x\n", id, drv_stat);
b095518e 881
2d202024
AC		 882 /* We need a sensible error return here, which is tricky, and one
883 that won't cause people to do things like return a disk wrongly */
884 *sk = ABORTED_COMMAND;
885 *asc = 0x00;
886 *ascq = 0x00;
b095518e
JG		 887
888 translate_done:
246619da
TH		 889 if (verbose)
890 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
891 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
892 id, drv_stat, drv_err, *sk, *asc, *ascq);
b095518e
JG		 893 return;
894}
895
896/*
750426aa 897 * ata_gen_passthru_sense - Generate check condition sense block.
b095518e
JG		 898 * @qc: Command that completed.
899 *
900 * This function is specific to the ATA descriptor format sense
901 * block specified for the ATA pass through commands. Regardless
902 * of whether the command errored or not, return a sense
903 * block. Copy all controller registers into the sense
904 * block. Clear sense key, ASC & ASCQ if there is no error.
905 *
906 * LOCKING:
750426aa 907 * None.
b095518e 908 */
750426aa 909static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
b095518e
JG		 910{
911 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 912 struct ata_taskfile *tf = &qc->result_tf;
b095518e
JG		 913 unsigned char *sb = cmd->sense_buffer;
914 unsigned char *desc = sb + 8;
246619da 915 int verbose = qc->ap->ops->error_handler == NULL;
b095518e
JG		 916
917 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
918
0e5dec47 919 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 920
b095518e
JG		 921 /*
922 * Use ata_to_sense_error() to map status register bits
923 * onto sense key, asc & ascq.
924 */
058e55e1
TH		 925 if (qc->err_mask ||
926 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
44877b4e 927 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
246619da 928 &sb[1], &sb[2], &sb[3], verbose);
b095518e 929 sb[1] &= 0x0f;
1da177e4
LT		 930 }
931
b095518e
JG		 932 /*
933 * Sense data is current and format is descriptor.
934 */
935 sb[0] = 0x72;
1da177e4 936
b095518e
JG		 937 desc[0] = 0x09;
938
f38621b3
TH		 939 /* set length of additional sense data */
940 sb[7] = 14;
941 desc[1] = 12;
b095518e
JG		 942
943 /*
944 * Copy registers into sense buffer.
945 */
946 desc[2] = 0x00;
947 desc[3] = tf->feature; /* == error reg */
948 desc[5] = tf->nsect;
949 desc[7] = tf->lbal;
950 desc[9] = tf->lbam;
951 desc[11] = tf->lbah;
952 desc[12] = tf->device;
953 desc[13] = tf->command; /* == status reg */
954
955 /*
956 * Fill in Extend bit, and the high order bytes
957 * if applicable.
958 */
959 if (tf->flags & ATA_TFLAG_LBA48) {
960 desc[2] |= 0x01;
961 desc[4] = tf->hob_nsect;
962 desc[6] = tf->hob_lbal;
963 desc[8] = tf->hob_lbam;
964 desc[10] = tf->hob_lbah;
1da177e4 965 }
b095518e 966}
1da177e4 967
b095518e 968/**
750426aa 969 * ata_gen_ata_sense - generate a SCSI fixed sense block
b095518e
JG		 970 * @qc: Command that we are erroring out
971 *
d25614ba
TH		 972 * Generate sense block for a failed ATA command @qc. Descriptor
973 * format is used to accomodate LBA48 block address.
b095518e
JG		 974 *
975 * LOCKING:
750426aa 976 * None.
b095518e 977 */
750426aa 978static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
b095518e 979{
d25614ba 980 struct ata_device *dev = qc->dev;
b095518e 981 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 982 struct ata_taskfile *tf = &qc->result_tf;
b095518e 983 unsigned char *sb = cmd->sense_buffer;
d25614ba 984 unsigned char *desc = sb + 8;
246619da 985 int verbose = qc->ap->ops->error_handler == NULL;
d25614ba 986 u64 block;
b095518e
JG		 987
988 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
989
0e5dec47 990 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 991
d25614ba
TH		 992 /* sense data is current and format is descriptor */
993 sb[0] = 0x72;
994
995 /* Use ata_to_sense_error() to map status register bits
b095518e
JG		 996 * onto sense key, asc & ascq.
997 */
058e55e1
TH		 998 if (qc->err_mask ||
999 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
44877b4e 1000 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
d25614ba
TH		 1001 &sb[1], &sb[2], &sb[3], verbose);
1002 sb[1] &= 0x0f;
1da177e4 1003 }
1da177e4 1004
d25614ba 1005 block = ata_tf_read_block(&qc->result_tf, dev);
a7dac447 1006
d25614ba
TH		 1007 /* information sense data descriptor */
1008 sb[7] = 12;
1009 desc[0] = 0x00;
1010 desc[1] = 10;
a7dac447 1011
d25614ba
TH		 1012 desc[2] |= 0x80; /* valid */
1013 desc[6] = block >> 40;
1014 desc[7] = block >> 32;
1015 desc[8] = block >> 24;
1016 desc[9] = block >> 16;
1017 desc[10] = block >> 8;
1018 desc[11] = block;
1da177e4
LT		 1019}
1020
a6cce2a7
BK		 1021static void ata_scsi_sdev_config(struct scsi_device *sdev)
1022{
1023 sdev->use_10_for_rw = 1;
1024 sdev->use_10_for_ms = 1;
31cc23b3
TH		 1025
1026 /* Schedule policy is determined by ->qc_defer() callback and
1027 * it needs to see every deferred qc. Set dev_blocked to 1 to
1028 * prevent SCSI midlayer from automatically deferring
1029 * requests.
1030 */
1031 sdev->max_device_blocked = 1;
a6cce2a7
BK		 1032}
1033
fa2fc7f4
JB		 1034/**
1035 * atapi_drain_needed - Check whether data transfer may overflow
73fd8b6d 1036 * @rq: request to be checked
fa2fc7f4
JB		 1037 *
1038 * ATAPI commands which transfer variable length data to host
1039 * might overflow due to application error or hardare bug. This
1040 * function checks whether overflow should be drained and ignored
1041 * for @request.
1042 *
1043 * LOCKING:
1044 * None.
1045 *
1046 * RETURNS:
1047 * 1 if ; otherwise, 0.
1048 */
1049static int atapi_drain_needed(struct request *rq)
1050{
1051 if (likely(!blk_pc_request(rq)))
1052 return 0;
1053
1054 if (!rq->data_len || (rq->cmd_flags & REQ_RW))
1055 return 0;
1056
1057 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1058}
1059
1060static int ata_scsi_dev_config(struct scsi_device *sdev,
1061 struct ata_device *dev)
a6cce2a7 1062{
45fabbb7
EO		 1063 if (!ata_id_has_unload(dev->id))
1064 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1065
914ed354
TH		 1066 /* configure max sectors */
1067 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);
a6cce2a7 1068
fa2fc7f4
JB		 1069 if (dev->class == ATA_DEV_ATAPI) {
1070 struct request_queue *q = sdev->request_queue;
1071 void *buf;
1072
e3790c7d 1073 /* set the min alignment and padding */
d0ad3bc9
JB		 1074 blk_queue_update_dma_alignment(sdev->request_queue,
1075 ATA_DMA_PAD_SZ - 1);
27f8221a
FT		 1076 blk_queue_update_dma_pad(sdev->request_queue,
1077 ATA_DMA_PAD_SZ - 1);
fa2fc7f4
JB		 1078
1079 /* configure draining */
1080 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1081 if (!buf) {
1082 ata_dev_printk(dev, KERN_ERR,
1083 "drain buffer allocation failed\n");
1084 return -ENOMEM;
1085 }
1086
1087 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1088 } else {
8bff7c6b
JA		 1089 if (ata_id_is_ssd(dev->id))
1090 queue_flag_set_unlocked(QUEUE_FLAG_NONROT,
1091 sdev->request_queue);
1092
d0ad3bc9
JB		 1093 /* ATA devices must be sector aligned */
1094 blk_queue_update_dma_alignment(sdev->request_queue,
1095 ATA_SECT_SIZE - 1);
d8cf5389 1096 sdev->manage_start_stop = 1;
dde20207 1097 }
d8cf5389 1098
f26792d5
JG		 1099 if (dev->flags & ATA_DFLAG_AN)
1100 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1101
a6e6ce8e
TH		 1102 if (dev->flags & ATA_DFLAG_NCQ) {
1103 int depth;
1104
1105 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1106 depth = min(ATA_MAX_QUEUE - 1, depth);
8a8bc223 1107 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
a6e6ce8e 1108 }
fa2fc7f4
JB		 1109
1110 return 0;
a6cce2a7
BK		 1111}
1112
1da177e4
LT		 1113/**
1114 * ata_scsi_slave_config - Set SCSI device attributes
1115 * @sdev: SCSI device to examine
1116 *
1117 * This is called before we actually start reading
1118 * and writing to the device, to configure certain
1119 * SCSI mid-layer behaviors.
1120 *
1121 * LOCKING:
1122 * Defined by SCSI layer. We don't really care.
1123 */
1124
1125int ata_scsi_slave_config(struct scsi_device *sdev)
1126{
31534363
TH		 1127 struct ata_port *ap = ata_shost_to_port(sdev->host);
1128 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
fa2fc7f4 1129 int rc = 0;
31534363 1130
a6cce2a7 1131 ata_scsi_sdev_config(sdev);
1da177e4 1132
31534363 1133 if (dev)
fa2fc7f4 1134 rc = ata_scsi_dev_config(sdev, dev);
1da177e4 1135
fa2fc7f4 1136 return rc;
1da177e4
LT		 1137}
1138
83c47bcb
TH		 1139/**
1140 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1141 * @sdev: SCSI device to be destroyed
1142 *
1143 * @sdev is about to be destroyed for hot/warm unplugging. If
1144 * this unplugging was initiated by libata as indicated by NULL
1145 * dev->sdev, this function doesn't have to do anything.
1146 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1147 * Clear dev->sdev, schedule the device for ATA detach and invoke
1148 * EH.
1149 *
1150 * LOCKING:
1151 * Defined by SCSI layer. We don't really care.
1152 */
1153void ata_scsi_slave_destroy(struct scsi_device *sdev)
1154{
1155 struct ata_port *ap = ata_shost_to_port(sdev->host);
fa2fc7f4 1156 struct request_queue *q = sdev->request_queue;
83c47bcb
TH		 1157 unsigned long flags;
1158 struct ata_device *dev;
1159
1160 if (!ap->ops->error_handler)
1161 return;
1162
ba6a1308 1163 spin_lock_irqsave(ap->lock, flags);
83c47bcb
TH		 1164 dev = __ata_scsi_find_dev(ap, sdev);
1165 if (dev && dev->sdev) {
1166 /* SCSI device already in CANCEL state, no need to offline it */
1167 dev->sdev = NULL;
1168 dev->flags |= ATA_DFLAG_DETACH;
1169 ata_port_schedule_eh(ap);
1170 }
ba6a1308 1171 spin_unlock_irqrestore(ap->lock, flags);
fa2fc7f4
JB		 1172
1173 kfree(q->dma_drain_buffer);
1174 q->dma_drain_buffer = NULL;
1175 q->dma_drain_size = 0;
83c47bcb
TH		 1176}
1177
a6e6ce8e
TH		 1178/**
1179 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1180 * @sdev: SCSI device to configure queue depth for
1181 * @queue_depth: new queue depth
1182 *
1183 * This is libata standard hostt->change_queue_depth callback.
1184 * SCSI will call into this callback when user tries to set queue
1185 * depth via sysfs.
1186 *
1187 * LOCKING:
1188 * SCSI layer (we don't care)
1189 *
1190 * RETURNS:
1191 * Newly configured queue depth.
1192 */
1193int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
1194{
1195 struct ata_port *ap = ata_shost_to_port(sdev->host);
1196 struct ata_device *dev;
360f654e 1197 unsigned long flags;
a6e6ce8e 1198
c3c70c44 1199 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
a6e6ce8e
TH		 1200 return sdev->queue_depth;
1201
1202 dev = ata_scsi_find_dev(ap, sdev);
1203 if (!dev || !ata_dev_enabled(dev))
1204 return sdev->queue_depth;
1205
c3c70c44 1206 /* NCQ enabled? */
360f654e 1207 spin_lock_irqsave(ap->lock, flags);
c3c70c44
TH		 1208 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1209 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
360f654e 1210 dev->flags |= ATA_DFLAG_NCQ_OFF;
c3c70c44
TH		 1211 queue_depth = 1;
1212 }
360f654e
TH		 1213 spin_unlock_irqrestore(ap->lock, flags);
1214
c3c70c44
TH		 1215 /* limit and apply queue depth */
1216 queue_depth = min(queue_depth, sdev->host->can_queue);
1217 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1218 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1219
1220 if (sdev->queue_depth == queue_depth)
1221 return -EINVAL;
1222
1223 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
a6e6ce8e
TH		 1224 return queue_depth;
1225}
1226
d9aca22c 1227/* XXX: for spindown warning */
da071b42
TH		 1228static void ata_delayed_done_timerfn(unsigned long arg)
1229{
1230 struct scsi_cmnd *scmd = (void *)arg;
1231
1232 scmd->scsi_done(scmd);
1233}
1234
d9aca22c 1235/* XXX: for spindown warning */
da071b42
TH		 1236static void ata_delayed_done(struct scsi_cmnd *scmd)
1237{
1238 static struct timer_list timer;
1239
1240 setup_timer(&timer, ata_delayed_done_timerfn, (unsigned long)scmd);
1241 mod_timer(&timer, jiffies + 5 * HZ);
1242}
1243
972dcafb
DG		 1244/**
1245 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1246 * @qc: Storage for translated ATA taskfile
972dcafb
DG		 1247 *
1248 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1249 * (to start). Perhaps these commands should be preceded by
1250 * CHECK POWER MODE to see what power mode the device is already in.
1251 * [See SAT revision 5 at www.t10.org]
1252 *
1253 * LOCKING:
cca3974e 1254 * spin_lock_irqsave(host lock)
972dcafb
DG		 1255 *
1256 * RETURNS:
1257 * Zero on success, non-zero on error.
1258 */
ad706991 1259static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
972dcafb 1260{
542b1444 1261 struct scsi_cmnd *scmd = qc->scsicmd;
972dcafb 1262 struct ata_taskfile *tf = &qc->tf;
ad706991 1263 const u8 *cdb = scmd->cmnd;
972dcafb 1264
2e5704f6
TH		 1265 if (scmd->cmd_len < 5)
1266 goto invalid_fld;
1267
972dcafb
DG		 1268 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1269 tf->protocol = ATA_PROT_NODATA;
542b1444 1270 if (cdb[1] & 0x1) {
972dcafb
DG		 1271 ; /* ignore IMMED bit, violates sat-r05 */
1272 }
542b1444 1273 if (cdb[4] & 0x2)
ae006510 1274 goto invalid_fld; /* LOEJ bit set not supported */
542b1444 1275 if (((cdb[4] >> 4) & 0xf) != 0)
ae006510 1276 goto invalid_fld; /* power conditions not supported */
e31e8531 1277
542b1444 1278 if (cdb[4] & 0x1) {
972dcafb 1279 tf->nsect = 1; /* 1 sector, lba=0 */
9d5b1302
AL		 1280
1281 if (qc->dev->flags & ATA_DFLAG_LBA) {
c44078c0 1282 tf->flags |= ATA_TFLAG_LBA;
9d5b1302
AL		 1283
1284 tf->lbah = 0x0;
1285 tf->lbam = 0x0;
1286 tf->lbal = 0x0;
1287 tf->device |= ATA_LBA;
1288 } else {
1289 /* CHS */
1290 tf->lbal = 0x1; /* sect */
1291 tf->lbam = 0x0; /* cyl low */
1292 tf->lbah = 0x0; /* cyl high */
1293 }
1294
972dcafb 1295 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
920a4b10
TH		 1296 } else {
1297 /* XXX: This is for backward compatibility, will be
1298 * removed. Read Documentation/feature-removal-schedule.txt
1299 * for more info.
1300 */
d9aca22c 1301 if ((qc->dev->flags & ATA_DFLAG_SPUNDOWN) &&
920a4b10
TH		 1302 (system_state == SYSTEM_HALT ||
1303 system_state == SYSTEM_POWER_OFF)) {
2dcb407e 1304 static unsigned long warned;
920a4b10 1305
da071b42 1306 if (!test_and_set_bit(0, &warned)) {
920a4b10
TH		 1307 ata_dev_printk(qc->dev, KERN_WARNING,
1308 "DISK MIGHT NOT BE SPUN DOWN PROPERLY. "
1309 "UPDATE SHUTDOWN UTILITY\n");
1310 ata_dev_printk(qc->dev, KERN_WARNING,
1311 "For more info, visit "
1312 "http://linux-ata.org/shutdown.html\n");
da071b42
TH		 1313
1314 /* ->scsi_done is not used, use it for
1315 * delayed completion.
1316 */
1317 scmd->scsi_done = qc->scsidone;
1318 qc->scsidone = ata_delayed_done;
920a4b10
TH		 1319 }
1320 scmd->result = SAM_STAT_GOOD;
1321 return 1;
1322 }
1323
78981a7c
RH		 1324 /* Issue ATA STANDBY IMMEDIATE command */
1325 tf->command = ATA_CMD_STANDBYNOW1;
920a4b10 1326 }
78981a7c 1327
972dcafb
DG		 1328 /*
1329 * Standby and Idle condition timers could be implemented but that
1330 * would require libata to implement the Power condition mode page
1331 * and allow the user to change it. Changing mode pages requires
1332 * MODE SELECT to be implemented.
1333 */
1334
1335 return 0;
ae006510
DG		 1336
1337invalid_fld:
542b1444 1338 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1339 /* "Invalid field in cbd" */
1340 return 1;
972dcafb
DG		 1341}
1342
1343
1da177e4
LT		 1344/**
1345 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1346 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1347 *
1348 * Sets up an ATA taskfile to issue FLUSH CACHE or
1349 * FLUSH CACHE EXT.
1350 *
1351 * LOCKING:
cca3974e 1352 * spin_lock_irqsave(host lock)
1da177e4
LT		 1353 *
1354 * RETURNS:
1355 * Zero on success, non-zero on error.
1356 */
ad706991 1357static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1da177e4
LT		 1358{
1359 struct ata_taskfile *tf = &qc->tf;
1360
1361 tf->flags |= ATA_TFLAG_DEVICE;
1362 tf->protocol = ATA_PROT_NODATA;
1363
6fc49adb 1364 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1da177e4
LT		 1365 tf->command = ATA_CMD_FLUSH_EXT;
1366 else
1367 tf->command = ATA_CMD_FLUSH;
1368
b666da35
TH		 1369 /* flush is critical for IO integrity, consider it an IO command */
1370 qc->flags |= ATA_QCFLAG_IO;
1371
1da177e4
LT		 1372 return 0;
1373}
1374
3aef5231
AL		 1375/**
1376 * scsi_6_lba_len - Get LBA and transfer length
542b1444 1377 * @cdb: SCSI command to translate
3aef5231
AL		 1378 *
1379 * Calculate LBA and transfer length for 6-byte commands.
1380 *
1381 * RETURNS:
1382 * @plba: the LBA
1383 * @plen: the transfer length
1384 */
542b1444 1385static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1386{
1387 u64 lba = 0;
6c7b7d2b 1388 u32 len;
3aef5231
AL		 1389
1390 VPRINTK("six-byte command\n");
1391
6c7b7d2b 1392 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
542b1444
TH		 1393 lba |= ((u64)cdb[2]) << 8;
1394 lba |= ((u64)cdb[3]);
3aef5231 1395
6c7b7d2b 1396 len = cdb[4];
3aef5231
AL		 1397
1398 *plba = lba;
1399 *plen = len;
1400}
1401
1402/**
1403 * scsi_10_lba_len - Get LBA and transfer length
542b1444 1404 * @cdb: SCSI command to translate
3aef5231
AL		 1405 *
1406 * Calculate LBA and transfer length for 10-byte commands.
1407 *
1408 * RETURNS:
1409 * @plba: the LBA
1410 * @plen: the transfer length
1411 */
542b1444 1412static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1413{
1414 u64 lba = 0;
1415 u32 len = 0;
1416
1417 VPRINTK("ten-byte command\n");
1418
542b1444
TH		 1419 lba |= ((u64)cdb[2]) << 24;
1420 lba |= ((u64)cdb[3]) << 16;
1421 lba |= ((u64)cdb[4]) << 8;
1422 lba |= ((u64)cdb[5]);
3aef5231 1423
542b1444
TH		 1424 len |= ((u32)cdb[7]) << 8;
1425 len |= ((u32)cdb[8]);
3aef5231
AL		 1426
1427 *plba = lba;
1428 *plen = len;
1429}
1430
1431/**
1432 * scsi_16_lba_len - Get LBA and transfer length
542b1444 1433 * @cdb: SCSI command to translate
3aef5231
AL		 1434 *
1435 * Calculate LBA and transfer length for 16-byte commands.
1436 *
1437 * RETURNS:
1438 * @plba: the LBA
1439 * @plen: the transfer length
1440 */
542b1444 1441static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1442{
1443 u64 lba = 0;
1444 u32 len = 0;
1445
1446 VPRINTK("sixteen-byte command\n");
1447
542b1444
TH		 1448 lba |= ((u64)cdb[2]) << 56;
1449 lba |= ((u64)cdb[3]) << 48;
1450 lba |= ((u64)cdb[4]) << 40;
1451 lba |= ((u64)cdb[5]) << 32;
1452 lba |= ((u64)cdb[6]) << 24;
1453 lba |= ((u64)cdb[7]) << 16;
1454 lba |= ((u64)cdb[8]) << 8;
1455 lba |= ((u64)cdb[9]);
3aef5231 1456
542b1444
TH		 1457 len |= ((u32)cdb[10]) << 24;
1458 len |= ((u32)cdb[11]) << 16;
1459 len |= ((u32)cdb[12]) << 8;
1460 len |= ((u32)cdb[13]);
3aef5231
AL		 1461
1462 *plba = lba;
1463 *plen = len;
1464}
1465
1da177e4
LT		 1466/**
1467 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1468 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1469 *
1470 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1471 *
1472 * LOCKING:
cca3974e 1473 * spin_lock_irqsave(host lock)
1da177e4
LT		 1474 *
1475 * RETURNS:
1476 * Zero on success, non-zero on error.
1477 */
ad706991 1478static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1da177e4 1479{
542b1444 1480 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4 1481 struct ata_taskfile *tf = &qc->tf;
8bf62ece 1482 struct ata_device *dev = qc->dev;
1da177e4 1483 u64 dev_sectors = qc->dev->n_sectors;
ad706991 1484 const u8 *cdb = scmd->cmnd;
3aef5231
AL		 1485 u64 block;
1486 u32 n_block;
1da177e4
LT		 1487
1488 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1489 tf->protocol = ATA_PROT_NODATA;
1da177e4 1490
2e5704f6
TH		 1491 if (cdb[0] == VERIFY) {
1492 if (scmd->cmd_len < 10)
1493 goto invalid_fld;
542b1444 1494 scsi_10_lba_len(cdb, &block, &n_block);
2e5704f6
TH		 1495 } else if (cdb[0] == VERIFY_16) {
1496 if (scmd->cmd_len < 16)
1497 goto invalid_fld;
542b1444 1498 scsi_16_lba_len(cdb, &block, &n_block);
2e5704f6 1499 } else
ae006510 1500 goto invalid_fld;
1da177e4 1501
8bf62ece 1502 if (!n_block)
ae006510 1503 goto nothing_to_do;
8bf62ece 1504 if (block >= dev_sectors)
ae006510 1505 goto out_of_range;
8bf62ece 1506 if ((block + n_block) > dev_sectors)
ae006510 1507 goto out_of_range;
1da177e4 1508
07506697
AL		 1509 if (dev->flags & ATA_DFLAG_LBA) {
1510 tf->flags |= ATA_TFLAG_LBA;
1511
c6a33e24
AL		 1512 if (lba_28_ok(block, n_block)) {
1513 /* use LBA28 */
1514 tf->command = ATA_CMD_VERIFY;
1515 tf->device |= (block >> 24) & 0xf;
1516 } else if (lba_48_ok(block, n_block)) {
1517 if (!(dev->flags & ATA_DFLAG_LBA48))
1518 goto out_of_range;
07506697
AL		 1519
1520 /* use LBA48 */
1521 tf->flags |= ATA_TFLAG_LBA48;
8bf62ece 1522 tf->command = ATA_CMD_VERIFY_EXT;
1da177e4 1523
8bf62ece 1524 tf->hob_nsect = (n_block >> 8) & 0xff;
1da177e4 1525
8bf62ece
AL		 1526 tf->hob_lbah = (block >> 40) & 0xff;
1527 tf->hob_lbam = (block >> 32) & 0xff;
1528 tf->hob_lbal = (block >> 24) & 0xff;
c6a33e24
AL		 1529 } else
1530 /* request too large even for LBA48 */
1531 goto out_of_range;
8bf62ece
AL		 1532
1533 tf->nsect = n_block & 0xff;
1da177e4 1534
8bf62ece
AL		 1535 tf->lbah = (block >> 16) & 0xff;
1536 tf->lbam = (block >> 8) & 0xff;
1537 tf->lbal = block & 0xff;
1da177e4 1538
8bf62ece
AL		 1539 tf->device |= ATA_LBA;
1540 } else {
1541 /* CHS */
1542 u32 sect, head, cyl, track;
1543
c6a33e24
AL		 1544 if (!lba_28_ok(block, n_block))
1545 goto out_of_range;
07506697 1546
8bf62ece
AL		 1547 /* Convert LBA to CHS */
1548 track = (u32)block / dev->sectors;
1549 cyl = track / dev->heads;
1550 head = track % dev->heads;
1551 sect = (u32)block % dev->sectors + 1;
1552
c187c4b5
AL		 1553 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1554 (u32)block, track, cyl, head, sect);
2e9edbf8
JG		 1555
1556 /* Check whether the converted CHS can fit.
1557 Cylinder: 0-65535
8bf62ece
AL		 1558 Head: 0-15
1559 Sector: 1-255*/
2e9edbf8 1560 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
ae006510 1561 goto out_of_range;
2e9edbf8 1562
8bf62ece
AL		 1563 tf->command = ATA_CMD_VERIFY;
1564 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1565 tf->lbal = sect;
1566 tf->lbam = cyl;
1567 tf->lbah = cyl >> 8;
1568 tf->device |= head;
1569 }
1da177e4
LT		 1570
1571 return 0;
ae006510
DG		 1572
1573invalid_fld:
542b1444 1574 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1575 /* "Invalid field in cbd" */
1576 return 1;
1577
1578out_of_range:
542b1444 1579 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1580 /* "Logical Block Address out of range" */
1581 return 1;
1582
1583nothing_to_do:
542b1444 1584 scmd->result = SAM_STAT_GOOD;
ae006510 1585 return 1;
1da177e4
LT		 1586}
1587
1588/**
1589 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1590 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1591 *
1592 * Converts any of six SCSI read/write commands into the
1593 * ATA counterpart, including starting sector (LBA),
1594 * sector count, and taking into account the device's LBA48
1595 * support.
1596 *
1597 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1598 * %WRITE_16 are currently supported.
1599 *
1600 * LOCKING:
cca3974e 1601 * spin_lock_irqsave(host lock)
1da177e4
LT		 1602 *
1603 * RETURNS:
1604 * Zero on success, non-zero on error.
1605 */
ad706991 1606static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1da177e4 1607{
542b1444 1608 struct scsi_cmnd *scmd = qc->scsicmd;
ad706991 1609 const u8 *cdb = scmd->cmnd;
bd056d7e 1610 unsigned int tf_flags = 0;
3aef5231
AL		 1611 u64 block;
1612 u32 n_block;
bd056d7e 1613 int rc;
1da177e4 1614
542b1444 1615 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
bd056d7e 1616 tf_flags |= ATA_TFLAG_WRITE;
1da177e4 1617
9a3dccc4 1618 /* Calculate the SCSI LBA, transfer length and FUA. */
542b1444 1619 switch (cdb[0]) {
3aef5231
AL		 1620 case READ_10:
1621 case WRITE_10:
2e5704f6
TH		 1622 if (unlikely(scmd->cmd_len < 10))
1623 goto invalid_fld;
542b1444
TH		 1624 scsi_10_lba_len(cdb, &block, &n_block);
1625 if (unlikely(cdb[1] & (1 << 3)))
bd056d7e 1626 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1627 break;
1628 case READ_6:
1629 case WRITE_6:
2e5704f6
TH		 1630 if (unlikely(scmd->cmd_len < 6))
1631 goto invalid_fld;
542b1444 1632 scsi_6_lba_len(cdb, &block, &n_block);
c187c4b5
AL		 1633
1634 /* for 6-byte r/w commands, transfer length 0
1635 * means 256 blocks of data, not 0 block.
1636 */
76b2bf9b
JG		 1637 if (!n_block)
1638 n_block = 256;
3aef5231
AL		 1639 break;
1640 case READ_16:
1641 case WRITE_16:
2e5704f6
TH		 1642 if (unlikely(scmd->cmd_len < 16))
1643 goto invalid_fld;
542b1444
TH		 1644 scsi_16_lba_len(cdb, &block, &n_block);
1645 if (unlikely(cdb[1] & (1 << 3)))
bd056d7e 1646 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1647 break;
1648 default:
8bf62ece 1649 DPRINTK("no-byte command\n");
ae006510 1650 goto invalid_fld;
1da177e4
LT		 1651 }
1652
8bf62ece
AL		 1653 /* Check and compose ATA command */
1654 if (!n_block)
c187c4b5
AL		 1655 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1656 * length 0 means transfer 0 block of data.
1657 * However, for ATA R/W commands, sector count 0 means
1658 * 256 or 65536 sectors, not 0 sectors as in SCSI.
f51750d5
AC		 1659 *
1660 * WARNING: one or two older ATA drives treat 0 as 0...
c187c4b5 1661 */
ae006510 1662 goto nothing_to_do;
1da177e4 1663
bd056d7e 1664 qc->flags |= ATA_QCFLAG_IO;
726f0785 1665 qc->nbytes = n_block * ATA_SECT_SIZE;
1da177e4 1666
bd056d7e
TH		 1667 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1668 qc->tag);
1669 if (likely(rc == 0))
1670 return 0;
ae006510 1671
bd056d7e
TH		 1672 if (rc == -ERANGE)
1673 goto out_of_range;
1674 /* treat all other errors as -EINVAL, fall through */
ae006510 1675invalid_fld:
542b1444 1676 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1677 /* "Invalid field in cbd" */
1678 return 1;
1679
1680out_of_range:
542b1444 1681 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1682 /* "Logical Block Address out of range" */
1683 return 1;
1684
1685nothing_to_do:
542b1444 1686 scmd->result = SAM_STAT_GOOD;
ae006510 1687 return 1;
1da177e4
LT		 1688}
1689
77853bf2 1690static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1da177e4 1691{
c31f571d 1692 struct ata_port *ap = qc->ap;
1da177e4 1693 struct scsi_cmnd *cmd = qc->scsicmd;
a7dac447 1694 u8 *cdb = cmd->cmnd;
2dcb407e 1695 int need_sense = (qc->err_mask != 0);
b095518e
JG		 1696
1697 /* For ATA pass thru (SAT) commands, generate a sense block if
1698 * user mandated it or if there's an error. Note that if we
1699 * generate because the user forced us to, a check condition
1700 * is generated and the ATA register values are returned
1701 * whether the command completed successfully or not. If there
1702 * was no error, SK, ASC and ASCQ will all be zero.
1703 */
a7dac447 1704 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
2dcb407e 1705 ((cdb[2] & 0x20) || need_sense)) {
750426aa 1706 ata_gen_passthru_sense(qc);
b095518e
JG		 1707 } else {
1708 if (!need_sense) {
1709 cmd->result = SAM_STAT_GOOD;
1710 } else {
1711 /* TODO: decide which descriptor format to use
1712 * for 48b LBA devices and call that here
1713 * instead of the fixed desc, which is only
1714 * good for smaller LBA (and maybe CHS?)
1715 * devices.
1716 */
750426aa 1717 ata_gen_ata_sense(qc);
b095518e
JG		 1718 }
1719 }
1da177e4 1720
d9aca22c 1721 /* XXX: track spindown state for spindown skipping and warning */
13b8d09f
TH		 1722 if (unlikely(qc->tf.command == ATA_CMD_STANDBY ||
1723 qc->tf.command == ATA_CMD_STANDBYNOW1))
1724 qc->dev->flags |= ATA_DFLAG_SPUNDOWN;
1725 else if (likely(system_state != SYSTEM_HALT &&
1726 system_state != SYSTEM_POWER_OFF))
1727 qc->dev->flags &= ~ATA_DFLAG_SPUNDOWN;
1728
c31f571d 1729 if (need_sense && !ap->ops->error_handler)
44877b4e 1730 ata_dump_status(ap->print_id, &qc->result_tf);
1da177e4
LT		 1731
1732 qc->scsidone(cmd);
1733
77853bf2 1734 ata_qc_free(qc);
1da177e4
LT		 1735}
1736
1737/**
1738 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1da177e4
LT		 1739 * @dev: ATA device to which the command is addressed
1740 * @cmd: SCSI command to execute
1741 * @done: SCSI command completion function
1742 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1743 *
1744 * Our ->queuecommand() function has decided that the SCSI
1745 * command issued can be directly translated into an ATA
1746 * command, rather than handled internally.
1747 *
1748 * This function sets up an ata_queued_cmd structure for the
1749 * SCSI command, and sends that ata_queued_cmd to the hardware.
1750 *
ae006510
DG		 1751 * The xlat_func argument (actor) returns 0 if ready to execute
1752 * ATA command, else 1 to finish translation. If 1 is returned
1753 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1754 * to be set reflecting an error condition or clean (early)
1755 * termination.
1756 *
1da177e4 1757 * LOCKING:
cca3974e 1758 * spin_lock_irqsave(host lock)
2115ea94
TH		 1759 *
1760 * RETURNS:
1761 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1762 * needs to be deferred.
1da177e4 1763 */
2115ea94
TH		 1764static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1765 void (*done)(struct scsi_cmnd *),
1766 ata_xlat_func_t xlat_func)
1da177e4 1767{
31cc23b3 1768 struct ata_port *ap = dev->link->ap;
1da177e4 1769 struct ata_queued_cmd *qc;
31cc23b3 1770 int rc;
1da177e4
LT		 1771
1772 VPRINTK("ENTER\n");
1773
3373efd8 1774 qc = ata_scsi_qc_new(dev, cmd, done);
1da177e4 1775 if (!qc)
ae006510 1776 goto err_mem;
1da177e4
LT		 1777
1778 /* data is present; dma-map it */
be7db055
CH		 1779 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1780 cmd->sc_data_direction == DMA_TO_DEVICE) {
7120165c 1781 if (unlikely(scsi_bufflen(cmd) < 1)) {
f15a1daf
TH		 1782 ata_dev_printk(dev, KERN_WARNING,
1783 "WARNING: zero len r/w req\n");
ae006510 1784 goto err_did;
1da177e4
LT		 1785 }
1786
7120165c 1787 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1da177e4
LT		 1788
1789 qc->dma_dir = cmd->sc_data_direction;
1790 }
1791
1792 qc->complete_fn = ata_scsi_qc_complete;
1793
ad706991 1794 if (xlat_func(qc))
ae006510 1795 goto early_finish;
1da177e4 1796
31cc23b3
TH		 1797 if (ap->ops->qc_defer) {
1798 if ((rc = ap->ops->qc_defer(qc)))
1799 goto defer;
1800 }
1801
1da177e4 1802 /* select device, send command to hardware */
8e0e694a 1803 ata_qc_issue(qc);
1da177e4
LT		 1804
1805 VPRINTK("EXIT\n");
2115ea94 1806 return 0;
1da177e4 1807
ae006510 1808early_finish:
2dcb407e 1809 ata_qc_free(qc);
da071b42 1810 qc->scsidone(cmd);
ae006510 1811 DPRINTK("EXIT - early finish (good or error)\n");
2115ea94 1812 return 0;
ae006510
DG		 1813
1814err_did:
1da177e4 1815 ata_qc_free(qc);
ae006510 1816 cmd->result = (DID_ERROR << 16);
da071b42 1817 qc->scsidone(cmd);
253b92ec 1818err_mem:
ae006510 1819 DPRINTK("EXIT - internal\n");
2115ea94 1820 return 0;
3dc1d881
TH		 1821
1822defer:
31cc23b3 1823 ata_qc_free(qc);
3dc1d881 1824 DPRINTK("EXIT - defer\n");
31cc23b3
TH		 1825 if (rc == ATA_DEFER_LINK)
1826 return SCSI_MLQUEUE_DEVICE_BUSY;
1827 else
1828 return SCSI_MLQUEUE_HOST_BUSY;
1da177e4
LT		 1829}
1830
1831/**
1832 * ata_scsi_rbuf_get - Map response buffer.
ec2a20e6 1833 * @cmd: SCSI command containing buffer to be mapped.
87340e98
TH		 1834 * @flags: unsigned long variable to store irq enable status
1835 * @copy_in: copy in from user buffer
1da177e4 1836 *
87340e98 1837 * Prepare buffer for simulated SCSI commands.
1da177e4
LT		 1838 *
1839 * LOCKING:
87340e98 1840 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1da177e4
LT		 1841 *
1842 * RETURNS:
87340e98 1843 * Pointer to response buffer.
1da177e4 1844 */
87340e98
TH		 1845static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1846 unsigned long *flags)
1da177e4 1847{
87340e98 1848 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1da177e4 1849
87340e98
TH		 1850 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1851 if (copy_in)
1852 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1853 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1854 return ata_scsi_rbuf;
1da177e4
LT		 1855}
1856
1857/**
1858 * ata_scsi_rbuf_put - Unmap response buffer.
1859 * @cmd: SCSI command containing buffer to be unmapped.
87340e98
TH		 1860 * @copy_out: copy out result
1861 * @flags: @flags passed to ata_scsi_rbuf_get()
1da177e4 1862 *
87340e98
TH		 1863 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1864 * @copy_back is true.
1da177e4
LT		 1865 *
1866 * LOCKING:
87340e98 1867 * Unlocks ata_scsi_rbuf_lock.
1da177e4 1868 */
87340e98
TH		 1869static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1870 unsigned long *flags)
1da177e4 1871{
87340e98
TH		 1872 if (copy_out)
1873 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1874 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1875 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1da177e4
LT		 1876}
1877
1878/**
1879 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1880 * @args: device IDENTIFY data / SCSI command of interest.
1881 * @actor: Callback hook for desired SCSI command simulator
1882 *
1883 * Takes care of the hard work of simulating a SCSI command...
1884 * Mapping the response buffer, calling the command's handler,
1885 * and handling the handler's return value. This return value
1886 * indicates whether the handler wishes the SCSI command to be
ae006510
DG		 1887 * completed successfully (0), or not (in which case cmd->result
1888 * and sense buffer are assumed to be set).
1da177e4
LT		 1889 *
1890 * LOCKING:
cca3974e 1891 * spin_lock_irqsave(host lock)
1da177e4 1892 */
f0761be3 1893static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
87340e98 1894 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1da177e4
LT		 1895{
1896 u8 *rbuf;
87340e98 1897 unsigned int rc;
1da177e4 1898 struct scsi_cmnd *cmd = args->cmd;
b445c568
JG		 1899 unsigned long flags;
1900
87340e98
TH		 1901 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1902 rc = actor(args, rbuf);
1903 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
b445c568 1904
ae006510 1905 if (rc == 0)
1da177e4 1906 cmd->result = SAM_STAT_GOOD;
ae006510 1907 args->done(cmd);
1da177e4
LT		 1908}
1909
1910/**
1911 * ata_scsiop_inq_std - Simulate INQUIRY command
1912 * @args: device IDENTIFY data / SCSI command of interest.
1913 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 1914 *
1915 * Returns standard device identification data associated
b142eb65 1916 * with non-VPD INQUIRY command output.
1da177e4
LT		 1917 *
1918 * LOCKING:
cca3974e 1919 * spin_lock_irqsave(host lock)
1da177e4 1920 */
87340e98 1921static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 1922{
87340e98
TH		 1923 const u8 versions[] = {
1924 0x60, /* SAM-3 (no version claimed) */
1925
1926 0x03,
1927 0x20, /* SBC-2 (no version claimed) */
1928
1929 0x02,
1930 0x60 /* SPC-3 (no version claimed) */
1931 };
1da177e4
LT		 1932 u8 hdr[] = {
1933 TYPE_DISK,
1934 0,
1935 0x5, /* claim SPC-3 version compatibility */
1936 2,
1937 95 - 4
1938 };
1939
87340e98
TH		 1940 VPRINTK("ENTER\n");
1941
1da177e4
LT		 1942 /* set scsi removeable (RMB) bit per ata bit */
1943 if (ata_id_removeable(args->id))
1944 hdr[1] |= (1 << 7);
1945
1da177e4 1946 memcpy(rbuf, hdr, sizeof(hdr));
87340e98
TH		 1947 memcpy(&rbuf[8], "ATA ", 8);
1948 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1949 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1da177e4 1950
87340e98
TH		 1951 if (rbuf[32] == 0 || rbuf[32] == ' ')
1952 memcpy(&rbuf[32], "n/a ", 4);
1da177e4 1953
87340e98 1954 memcpy(rbuf + 59, versions, sizeof(versions));
1da177e4
LT		 1955
1956 return 0;
1957}
1958
1959/**
b142eb65 1960 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1da177e4
LT		 1961 * @args: device IDENTIFY data / SCSI command of interest.
1962 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 1963 *
b142eb65 1964 * Returns list of inquiry VPD pages available.
1da177e4
LT		 1965 *
1966 * LOCKING:
cca3974e 1967 * spin_lock_irqsave(host lock)
1da177e4 1968 */
87340e98 1969static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 1970{
1971 const u8 pages[] = {
1972 0x00, /* page 0x00, this page */
1973 0x80, /* page 0x80, unit serial no page */
1e9dbc92
MW		 1974 0x83, /* page 0x83, device ident page */
1975 0x89, /* page 0x89, ata info page */
1976 0xb1, /* page 0xb1, block device characteristics page */
1da177e4 1977 };
1da177e4 1978
87340e98
TH		 1979 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
1980 memcpy(rbuf + 4, pages, sizeof(pages));
1da177e4
LT		 1981 return 0;
1982}
1983
1984/**
b142eb65 1985 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1da177e4
LT		 1986 * @args: device IDENTIFY data / SCSI command of interest.
1987 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 1988 *
1989 * Returns ATA device serial number.
1990 *
1991 * LOCKING:
cca3974e 1992 * spin_lock_irqsave(host lock)
1da177e4 1993 */
87340e98 1994static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 1995{
1996 const u8 hdr[] = {
1997 0,
1998 0x80, /* this page code */
1999 0,
a0cf733b 2000 ATA_ID_SERNO_LEN, /* page len */
1da177e4 2001 };
1da177e4 2002
87340e98
TH		 2003 memcpy(rbuf, hdr, sizeof(hdr));
2004 ata_id_string(args->id, (unsigned char *) &rbuf[4],
2005 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1da177e4
LT		 2006 return 0;
2007}
2008
1da177e4 2009/**
b142eb65 2010 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1da177e4
LT		 2011 * @args: device IDENTIFY data / SCSI command of interest.
2012 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2013 *
b142eb65
JG		 2014 * Yields two logical unit device identification designators:
2015 * - vendor specific ASCII containing the ATA serial number
2016 * - SAT defined "t10 vendor id based" containing ASCII vendor
2017 * name ("ATA "), model and serial numbers.
1da177e4
LT		 2018 *
2019 * LOCKING:
cca3974e 2020 * spin_lock_irqsave(host lock)
1da177e4 2021 */
87340e98 2022static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2023{
b142eb65 2024 const int sat_model_serial_desc_len = 68;
87340e98 2025 int num;
1da177e4 2026
b142eb65
JG		 2027 rbuf[1] = 0x83; /* this page code */
2028 num = 4;
2029
87340e98
TH		 2030 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2031 rbuf[num + 0] = 2;
2032 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2033 num += 4;
2034 ata_id_string(args->id, (unsigned char *) rbuf + num,
2035 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2036 num += ATA_ID_SERNO_LEN;
2037
2038 /* SAT defined lu model and serial numbers descriptor */
2039 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2040 rbuf[num + 0] = 2;
2041 rbuf[num + 1] = 1;
2042 rbuf[num + 3] = sat_model_serial_desc_len;
2043 num += 4;
2044 memcpy(rbuf + num, "ATA ", 8);
2045 num += 8;
2046 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2047 ATA_ID_PROD_LEN);
2048 num += ATA_ID_PROD_LEN;
2049 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2050 ATA_ID_SERNO_LEN);
2051 num += ATA_ID_SERNO_LEN;
2052
b142eb65 2053 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
1da177e4
LT		 2054 return 0;
2055}
2056
ad355b46
JG		 2057/**
2058 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2059 * @args: device IDENTIFY data / SCSI command of interest.
2060 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
ad355b46
JG		 2061 *
2062 * Yields SAT-specified ATA VPD page.
2063 *
2064 * LOCKING:
2065 * spin_lock_irqsave(host lock)
2066 */
87340e98 2067static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
ad355b46 2068{
ad355b46 2069 struct ata_taskfile tf;
ad355b46 2070
ad355b46
JG		 2071 memset(&tf, 0, sizeof(tf));
2072
87340e98
TH		 2073 rbuf[1] = 0x89; /* our page code */
2074 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2075 rbuf[3] = (0x238 & 0xff);
ad355b46 2076
87340e98
TH		 2077 memcpy(&rbuf[8], "linux ", 8);
2078 memcpy(&rbuf[16], "libata ", 16);
2079 memcpy(&rbuf[32], DRV_VERSION, 4);
2080 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
ad355b46
JG		 2081
2082 /* we don't store the ATA device signature, so we fake it */
2083
2084 tf.command = ATA_DRDY; /* really, this is Status reg */
2085 tf.lbal = 0x1;
2086 tf.nsect = 0x1;
2087
87340e98
TH		 2088 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2089 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
ad355b46 2090
87340e98 2091 rbuf[56] = ATA_CMD_ID_ATA;
ad355b46 2092
87340e98 2093 memcpy(&rbuf[60], &args->id[0], 512);
ad355b46
JG		 2094 return 0;
2095}
2096
1e9dbc92
MW		 2097static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2098{
2099 rbuf[1] = 0xb1;
2100 rbuf[3] = 0x3c;
2101 if (ata_id_major_version(args->id) > 7) {
2102 rbuf[4] = args->id[217] >> 8;
2103 rbuf[5] = args->id[217];
2104 rbuf[7] = args->id[168] & 0xf;
2105 }
2106
2107 return 0;
2108}
2109
1da177e4 2110/**
0cba632b 2111 * ata_scsiop_noop - Command handler that simply returns success.
1da177e4
LT		 2112 * @args: device IDENTIFY data / SCSI command of interest.
2113 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2114 *
2115 * No operation. Simply returns success to caller, to indicate
2116 * that the caller should successfully complete this SCSI command.
2117 *
2118 * LOCKING:
cca3974e 2119 * spin_lock_irqsave(host lock)
1da177e4 2120 */
87340e98 2121static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2122{
2123 VPRINTK("ENTER\n");
2124 return 0;
2125}
2126
1da177e4
LT		 2127/**
2128 * ata_msense_caching - Simulate MODE SENSE caching info page
2129 * @id: device IDENTIFY data
87340e98 2130 * @buf: output buffer
1da177e4
LT		 2131 *
2132 * Generate a caching info page, which conditionally indicates
2133 * write caching to the SCSI layer, depending on device
2134 * capabilities.
2135 *
2136 * LOCKING:
2137 * None.
2138 */
87340e98 2139static unsigned int ata_msense_caching(u16 *id, u8 *buf)
1da177e4 2140{
87340e98 2141 memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage));
1da177e4 2142 if (ata_id_wcache_enabled(id))
87340e98 2143 buf[2] |= (1 << 2); /* write cache enable */
1da177e4 2144 if (!ata_id_rahead_enabled(id))
87340e98
TH		 2145 buf[12] |= (1 << 5); /* disable read ahead */
2146 return sizeof(def_cache_mpage);
1da177e4
LT		 2147}
2148
2149/**
2150 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
87340e98 2151 * @buf: output buffer
1da177e4
LT		 2152 *
2153 * Generate a generic MODE SENSE control mode page.
2154 *
2155 * LOCKING:
2156 * None.
2157 */
87340e98 2158static unsigned int ata_msense_ctl_mode(u8 *buf)
1da177e4 2159{
87340e98 2160 memcpy(buf, def_control_mpage, sizeof(def_control_mpage));
00ac37f5 2161 return sizeof(def_control_mpage);
1da177e4
LT		 2162}
2163
2164/**
2165 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
ec2a20e6 2166 * @buf: output buffer
1da177e4
LT		 2167 *
2168 * Generate a generic MODE SENSE r/w error recovery page.
2169 *
2170 * LOCKING:
2171 * None.
2172 */
87340e98 2173static unsigned int ata_msense_rw_recovery(u8 *buf)
1da177e4 2174{
87340e98 2175 memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage));
00ac37f5 2176 return sizeof(def_rw_recovery_mpage);
1da177e4
LT		 2177}
2178
48bdc8ec
JA		 2179/*
2180 * We can turn this into a real blacklist if it's needed, for now just
2181 * blacklist any Maxtor BANC1G10 revision firmware
2182 */
2183static int ata_dev_supports_fua(u16 *id)
2184{
a0cf733b 2185 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
48bdc8ec 2186
c3c013a2
JG		 2187 if (!libata_fua)
2188 return 0;
48bdc8ec
JA		 2189 if (!ata_id_has_fua(id))
2190 return 0;
2191
a0cf733b
TH		 2192 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2193 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
48bdc8ec 2194
2e02671d 2195 if (strcmp(model, "Maxtor"))
48bdc8ec 2196 return 1;
2e02671d 2197 if (strcmp(fw, "BANC1G10"))
48bdc8ec
JA		 2198 return 1;
2199
2200 return 0; /* blacklisted */
2201}
2202
1da177e4
LT		 2203/**
2204 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2205 * @args: device IDENTIFY data / SCSI command of interest.
2206 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2207 *
00ac37f5
DG		 2208 * Simulate MODE SENSE commands. Assume this is invoked for direct
2209 * access devices (e.g. disks) only. There should be no block
2210 * descriptor for other device types.
1da177e4
LT		 2211 *
2212 * LOCKING:
cca3974e 2213 * spin_lock_irqsave(host lock)
1da177e4 2214 */
87340e98 2215static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2216{
9a3dccc4 2217 struct ata_device *dev = args->dev;
87340e98 2218 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
00ac37f5
DG		 2219 const u8 sat_blk_desc[] = {
2220 0, 0, 0, 0, /* number of blocks: sat unspecified */
2221 0,
2222 0, 0x2, 0x0 /* block length: 512 bytes */
2223 };
2224 u8 pg, spg;
87340e98 2225 unsigned int ebd, page_control, six_byte;
9a3dccc4 2226 u8 dpofua;
1da177e4
LT		 2227
2228 VPRINTK("ENTER\n");
2229
2230 six_byte = (scsicmd[0] == MODE_SENSE);
00ac37f5
DG		 2231 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2232 /*
2233 * LLBA bit in msense(10) ignored (compliant)
1da177e4 2234 */
00ac37f5 2235
1da177e4 2236 page_control = scsicmd[2] >> 6;
ae006510
DG		 2237 switch (page_control) {
2238 case 0: /* current */
2239 break; /* supported */
2240 case 3: /* saved */
2241 goto saving_not_supp;
2242 case 1: /* changeable */
2243 case 2: /* defaults */
2244 default:
2245 goto invalid_fld;
2246 }
1da177e4 2247
87340e98
TH		 2248 if (six_byte)
2249 p += 4 + (ebd ? 8 : 0);
2250 else
2251 p += 8 + (ebd ? 8 : 0);
1da177e4 2252
00ac37f5
DG		 2253 pg = scsicmd[2] & 0x3f;
2254 spg = scsicmd[3];
2255 /*
2256 * No mode subpages supported (yet) but asking for _all_
2257 * subpages may be valid
2258 */
2259 if (spg && (spg != ALL_SUB_MPAGES))
2260 goto invalid_fld;
2261
2262 switch(pg) {
2263 case RW_RECOVERY_MPAGE:
87340e98 2264 p += ata_msense_rw_recovery(p);
1da177e4
LT		 2265 break;
2266
00ac37f5 2267 case CACHE_MPAGE:
87340e98 2268 p += ata_msense_caching(args->id, p);
1da177e4
LT		 2269 break;
2270
87340e98
TH		 2271 case CONTROL_MPAGE:
2272 p += ata_msense_ctl_mode(p);
1da177e4 2273 break;
1da177e4 2274
00ac37f5 2275 case ALL_MPAGES:
87340e98
TH		 2276 p += ata_msense_rw_recovery(p);
2277 p += ata_msense_caching(args->id, p);
2278 p += ata_msense_ctl_mode(p);
1da177e4
LT		 2279 break;
2280
2281 default: /* invalid page code */
ae006510 2282 goto invalid_fld;
1da177e4
LT		 2283 }
2284
9a3dccc4 2285 dpofua = 0;
f79d409f 2286 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
9a3dccc4
TH		 2287 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2288 dpofua = 1 << 4;
2289
1da177e4 2290 if (six_byte) {
87340e98
TH		 2291 rbuf[0] = p - rbuf - 1;
2292 rbuf[2] |= dpofua;
00ac37f5 2293 if (ebd) {
87340e98
TH		 2294 rbuf[3] = sizeof(sat_blk_desc);
2295 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
00ac37f5 2296 }
1da177e4 2297 } else {
87340e98
TH		 2298 unsigned int output_len = p - rbuf - 2;
2299
1da177e4 2300 rbuf[0] = output_len >> 8;
87340e98
TH		 2301 rbuf[1] = output_len;
2302 rbuf[3] |= dpofua;
00ac37f5 2303 if (ebd) {
87340e98
TH		 2304 rbuf[7] = sizeof(sat_blk_desc);
2305 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
00ac37f5 2306 }
1da177e4 2307 }
1da177e4 2308 return 0;
ae006510
DG		 2309
2310invalid_fld:
2311 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2312 /* "Invalid field in cbd" */
2313 return 1;
2314
2315saving_not_supp:
2316 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2317 /* "Saving parameters not supported" */
2318 return 1;
1da177e4
LT		 2319}
2320
2321/**
2322 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2323 * @args: device IDENTIFY data / SCSI command of interest.
2324 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2325 *
2326 * Simulate READ CAPACITY commands.
2327 *
2328 * LOCKING:
6a36261e 2329 * None.
1da177e4 2330 */
87340e98 2331static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2332{
6a36261e 2333 u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */
1da177e4
LT		 2334
2335 VPRINTK("ENTER\n");
2336
1da177e4 2337 if (args->cmd->cmnd[0] == READ_CAPACITY) {
6a36261e
TH		 2338 if (last_lba >= 0xffffffffULL)
2339 last_lba = 0xffffffff;
0c144d0d 2340
1da177e4 2341 /* sector count, 32-bit */
87340e98
TH		 2342 rbuf[0] = last_lba >> (8 * 3);
2343 rbuf[1] = last_lba >> (8 * 2);
2344 rbuf[2] = last_lba >> (8 * 1);
2345 rbuf[3] = last_lba;
1da177e4
LT		 2346
2347 /* sector size */
87340e98
TH		 2348 rbuf[6] = ATA_SECT_SIZE >> 8;
2349 rbuf[7] = ATA_SECT_SIZE & 0xff;
1da177e4
LT		 2350 } else {
2351 /* sector count, 64-bit */
87340e98
TH		 2352 rbuf[0] = last_lba >> (8 * 7);
2353 rbuf[1] = last_lba >> (8 * 6);
2354 rbuf[2] = last_lba >> (8 * 5);
2355 rbuf[3] = last_lba >> (8 * 4);
2356 rbuf[4] = last_lba >> (8 * 3);
2357 rbuf[5] = last_lba >> (8 * 2);
2358 rbuf[6] = last_lba >> (8 * 1);
2359 rbuf[7] = last_lba;
1da177e4
LT		 2360
2361 /* sector size */
87340e98
TH		 2362 rbuf[10] = ATA_SECT_SIZE >> 8;
2363 rbuf[11] = ATA_SECT_SIZE & 0xff;
1da177e4
LT		 2364 }
2365
2366 return 0;
2367}
2368
2369/**
2370 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2371 * @args: device IDENTIFY data / SCSI command of interest.
2372 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2373 *
2374 * Simulate REPORT LUNS command.
2375 *
2376 * LOCKING:
cca3974e 2377 * spin_lock_irqsave(host lock)
1da177e4 2378 */
87340e98 2379static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2380{
2381 VPRINTK("ENTER\n");
2382 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2383
2384 return 0;
2385}
2386
77853bf2 2387static void atapi_sense_complete(struct ata_queued_cmd *qc)
a939c963 2388{
74e6c8c3 2389 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
c6e6e666
JG		 2390 /* FIXME: not quite right; we don't want the
2391 * translation of taskfile registers into
2392 * a sense descriptors, since that's only
2393 * correct for ATA, not ATAPI
2394 */
750426aa 2395 ata_gen_passthru_sense(qc);
74e6c8c3 2396 }
a939c963 2397
c6e6e666 2398 qc->scsidone(qc->scsicmd);
77853bf2 2399 ata_qc_free(qc);
c6e6e666 2400}
a939c963 2401
c6e6e666
JG		 2402/* is it pointless to prefer PIO for "safety reasons"? */
2403static inline int ata_pio_use_silly(struct ata_port *ap)
2404{
2405 return (ap->flags & ATA_FLAG_PIO_DMA);
2406}
2407
2408static void atapi_request_sense(struct ata_queued_cmd *qc)
2409{
2410 struct ata_port *ap = qc->ap;
2411 struct scsi_cmnd *cmd = qc->scsicmd;
2412
2413 DPRINTK("ATAPI request sense\n");
a939c963
JG		 2414
2415 /* FIXME: is this needed? */
7ccd720d 2416 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
a939c963 2417
127102ae 2418#ifdef CONFIG_ATA_SFF
855d854a
JB		 2419 if (ap->ops->sff_tf_read)
2420 ap->ops->sff_tf_read(ap, &qc->tf);
127102ae 2421#endif
c6e6e666
JG		 2422
2423 /* fill these in, for the case where they are -not- overwritten */
2424 cmd->sense_buffer[0] = 0x70;
2425 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2426
2427 ata_qc_reinit(qc);
2428
93f8fecb 2429 /* setup sg table and init transfer direction */
cadb7345 2430 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
93f8fecb 2431 ata_sg_init(qc, &qc->sgent, 1);
a939c963
JG		 2432 qc->dma_dir = DMA_FROM_DEVICE;
2433
6e7846e9 2434 memset(&qc->cdb, 0, qc->dev->cdb_len);
a939c963
JG		 2435 qc->cdb[0] = REQUEST_SENSE;
2436 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2437
2438 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2439 qc->tf.command = ATA_CMD_PACKET;
2440
c6e6e666 2441 if (ata_pio_use_silly(ap)) {
0dc36888 2442 qc->tf.protocol = ATAPI_PROT_DMA;
c6e6e666
JG		 2443 qc->tf.feature |= ATAPI_PKT_DMA;
2444 } else {
0dc36888 2445 qc->tf.protocol = ATAPI_PROT_PIO;
2db78dd3
AC		 2446 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2447 qc->tf.lbah = 0;
c6e6e666 2448 }
a939c963
JG		 2449 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2450
c6e6e666 2451 qc->complete_fn = atapi_sense_complete;
a939c963 2452
8e0e694a 2453 ata_qc_issue(qc);
a939c963
JG		 2454
2455 DPRINTK("EXIT\n");
2456}
2457
77853bf2 2458static void atapi_qc_complete(struct ata_queued_cmd *qc)
1da177e4
LT		 2459{
2460 struct scsi_cmnd *cmd = qc->scsicmd;
a22e2eb0 2461 unsigned int err_mask = qc->err_mask;
1da177e4 2462
a7dac447 2463 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
e12669e7 2464
246619da
TH		 2465 /* handle completion from new EH */
2466 if (unlikely(qc->ap->ops->error_handler &&
2467 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2468
2469 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2470 /* FIXME: not quite right; we don't want the
2471 * translation of taskfile registers into a
2472 * sense descriptors, since that's only
2473 * correct for ATA, not ATAPI
2474 */
750426aa 2475 ata_gen_passthru_sense(qc);
246619da
TH		 2476 }
2477
22aac089
TH		 2478 /* SCSI EH automatically locks door if sdev->locked is
2479 * set. Sometimes door lock request continues to
2480 * fail, for example, when no media is present. This
2481 * creates a loop - SCSI EH issues door lock which
2482 * fails and gets invoked again to acquire sense data
2483 * for the failed command.
2484 *
2485 * If door lock fails, always clear sdev->locked to
2486 * avoid this infinite loop.
2487 */
2488 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
2489 qc->dev->sdev->locked = 0;
2490
246619da
TH		 2491 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2492 qc->scsidone(cmd);
2493 ata_qc_free(qc);
2494 return;
2495 }
2496
2497 /* successful completion or old EH failure path */
a7dac447 2498 if (unlikely(err_mask & AC_ERR_DEV)) {
1da177e4 2499 cmd->result = SAM_STAT_CHECK_CONDITION;
c6e6e666 2500 atapi_request_sense(qc);
77853bf2 2501 return;
74e6c8c3 2502 } else if (unlikely(err_mask)) {
a7dac447
JG		 2503 /* FIXME: not quite right; we don't want the
2504 * translation of taskfile registers into
2505 * a sense descriptors, since that's only
2506 * correct for ATA, not ATAPI
2507 */
750426aa 2508 ata_gen_passthru_sense(qc);
74e6c8c3 2509 } else {
1da177e4
LT		 2510 u8 *scsicmd = cmd->cmnd;
2511
fd71da46 2512 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
b445c568 2513 unsigned long flags;
87340e98 2514 u8 *buf;
b445c568 2515
87340e98 2516 buf = ata_scsi_rbuf_get(cmd, true, &flags);
a15dbeb4
JG		 2517
2518 /* ATAPI devices typically report zero for their SCSI version,
2519 * and sometimes deviate from the spec WRT response data
2520 * format. If SCSI version is reported as zero like normal,
2521 * then we make the following fixups: 1) Fake MMC-5 version,
2522 * to indicate to the Linux scsi midlayer this is a modern
2523 * device. 2) Ensure response data format / ATAPI information
2524 * are always correct.
a15dbeb4
JG		 2525 */
2526 if (buf[2] == 0) {
2527 buf[2] = 0x5;
2528 buf[3] = 0x32;
2529 }
2530
87340e98 2531 ata_scsi_rbuf_put(cmd, true, &flags);
1da177e4 2532 }
a15dbeb4 2533
1da177e4
LT		 2534 cmd->result = SAM_STAT_GOOD;
2535 }
2536
2537 qc->scsidone(cmd);
77853bf2 2538 ata_qc_free(qc);
1da177e4
LT		 2539}
2540/**
2541 * atapi_xlat - Initialize PACKET taskfile
2542 * @qc: command structure to be initialized
1da177e4
LT		 2543 *
2544 * LOCKING:
cca3974e 2545 * spin_lock_irqsave(host lock)
1da177e4
LT		 2546 *
2547 * RETURNS:
2548 * Zero on success, non-zero on failure.
2549 */
ad706991 2550static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
1da177e4 2551{
542b1444 2552 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4 2553 struct ata_device *dev = qc->dev;
542b1444 2554 int nodata = (scmd->sc_data_direction == DMA_NONE);
5895ef9a 2555 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2db78dd3 2556 unsigned int nbytes;
1da177e4 2557
2e5704f6
TH		 2558 memset(qc->cdb, 0, dev->cdb_len);
2559 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
1da177e4
LT		 2560
2561 qc->complete_fn = atapi_qc_complete;
2562
2563 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
542b1444 2564 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1da177e4
LT		 2565 qc->tf.flags |= ATA_TFLAG_WRITE;
2566 DPRINTK("direction: write\n");
2567 }
2568
2569 qc->tf.command = ATA_CMD_PACKET;
aacda375 2570 ata_qc_set_pc_nbytes(qc);
e00f1ff3
TH		 2571
2572 /* check whether ATAPI DMA is safe */
5895ef9a 2573 if (!nodata && !using_pio && atapi_check_dma(qc))
e00f1ff3 2574 using_pio = 1;
1da177e4 2575
e190222d
TH		 2576 /* Some controller variants snoop this value for Packet
2577 * transfers to do state machine and FIFO management. Thus we
2578 * want to set it properly, and for DMA where it is
2579 * effectively meaningless.
2580 */
aacda375 2581 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2db78dd3 2582
e190222d
TH		 2583 /* Most ATAPI devices which honor transfer chunk size don't
2584 * behave according to the spec when odd chunk size which
2585 * matches the transfer length is specified. If the number of
2586 * bytes to transfer is 2n+1. According to the spec, what
2587 * should happen is to indicate that 2n+1 is going to be
2588 * transferred and transfer 2n+2 bytes where the last byte is
2589 * padding.
2590 *
2591 * In practice, this doesn't happen. ATAPI devices first
2592 * indicate and transfer 2n bytes and then indicate and
2593 * transfer 2 bytes where the last byte is padding.
2594 *
2595 * This inconsistency confuses several controllers which
2596 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2597 * These controllers use actual number of transferred bytes to
2598 * update DMA poitner and transfer of 4n+2 bytes make those
2599 * controller push DMA pointer by 4n+4 bytes because SATA data
2600 * FISes are aligned to 4 bytes. This causes data corruption
2601 * and buffer overrun.
2602 *
2603 * Always setting nbytes to even number solves this problem
2604 * because then ATAPI devices don't have to split data at 2n
2605 * boundaries.
2606 */
2607 if (nbytes & 0x1)
2608 nbytes++;
2609
2db78dd3
AC		 2610 qc->tf.lbam = (nbytes & 0xFF);
2611 qc->tf.lbah = (nbytes >> 8);
2612
5895ef9a
TH		 2613 if (nodata)
2614 qc->tf.protocol = ATAPI_PROT_NODATA;
2615 else if (using_pio)
2616 qc->tf.protocol = ATAPI_PROT_PIO;
2617 else {
e00f1ff3 2618 /* DMA data xfer */
0dc36888 2619 qc->tf.protocol = ATAPI_PROT_DMA;
1da177e4
LT		 2620 qc->tf.feature |= ATAPI_PKT_DMA;
2621
91163006
TH		 2622 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2623 (scmd->sc_data_direction != DMA_TO_DEVICE))
95de719a 2624 /* some SATA bridges need us to indicate data xfer direction */
1da177e4 2625 qc->tf.feature |= ATAPI_DMADIR;
1da177e4
LT		 2626 }
2627
2db78dd3
AC		 2628
2629 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2630 as ATAPI tape drives don't get this right otherwise */
1da177e4
LT		 2631 return 0;
2632}
2633
2dcb407e 2634static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
ab5b3a5b 2635{
071f44b1 2636 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 2637 if (likely(devno < ata_link_max_devices(&ap->link)))
2638 return &ap->link.device[devno];
2639 } else {
2640 if (likely(devno < ap->nr_pmp_links))
2641 return &ap->pmp_link[devno].device[0];
2642 }
2643
ab5b3a5b
TH		 2644 return NULL;
2645}
2646
2dcb407e
JG		 2647static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2648 const struct scsi_device *scsidev)
ab5b3a5b 2649{
41bda9c9
TH		 2650 int devno;
2651
ab5b3a5b 2652 /* skip commands not addressed to targets we simulate */
071f44b1 2653 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 2654 if (unlikely(scsidev->channel || scsidev->lun))
2655 return NULL;
2656 devno = scsidev->id;
2657 } else {
2658 if (unlikely(scsidev->id || scsidev->lun))
2659 return NULL;
2660 devno = scsidev->channel;
2661 }
ab5b3a5b 2662
41bda9c9 2663 return ata_find_dev(ap, devno);
ab5b3a5b
TH		 2664}
2665
1da177e4
LT		 2666/**
2667 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2668 * @ap: ATA port to which the device is attached
2669 * @scsidev: SCSI device from which we derive the ATA device
2670 *
2671 * Given various information provided in struct scsi_cmnd,
2672 * map that onto an ATA bus, and using that mapping
2673 * determine which ata_device is associated with the
2674 * SCSI command to be sent.
2675 *
2676 * LOCKING:
cca3974e 2677 * spin_lock_irqsave(host lock)
1da177e4
LT		 2678 *
2679 * RETURNS:
2680 * Associated ATA device, or %NULL if not found.
2681 */
1da177e4 2682static struct ata_device *
057ace5e 2683ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
1da177e4 2684{
ab5b3a5b 2685 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
1da177e4 2686
2486fa56 2687 if (unlikely(!dev || !ata_dev_enabled(dev)))
1da177e4
LT		 2688 return NULL;
2689
1da177e4
LT		 2690 return dev;
2691}
2692
b095518e
JG		 2693/*
2694 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2695 * @byte1: Byte 1 from pass-thru CDB.
2696 *
2697 * RETURNS:
2698 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2699 */
2700static u8
2701ata_scsi_map_proto(u8 byte1)
2702{
2703 switch((byte1 & 0x1e) >> 1) {
2dcb407e
JG		 2704 case 3: /* Non-data */
2705 return ATA_PROT_NODATA;
2706
2707 case 6: /* DMA */
2708 case 10: /* UDMA Data-in */
2709 case 11: /* UDMA Data-Out */
2710 return ATA_PROT_DMA;
2711
2712 case 4: /* PIO Data-in */
2713 case 5: /* PIO Data-out */
2714 return ATA_PROT_PIO;
2715
2716 case 0: /* Hard Reset */
2717 case 1: /* SRST */
2718 case 8: /* Device Diagnostic */
2719 case 9: /* Device Reset */
2720 case 7: /* DMA Queued */
2721 case 12: /* FPDMA */
2722 case 15: /* Return Response Info */
2723 default: /* Reserved */
2724 break;
b095518e
JG		 2725 }
2726
2727 return ATA_PROT_UNKNOWN;
2728}
2729
2730/**
2731 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2732 * @qc: command structure to be initialized
b095518e
JG		 2733 *
2734 * Handles either 12 or 16-byte versions of the CDB.
2735 *
2736 * RETURNS:
2737 * Zero on success, non-zero on failure.
2738 */
ad706991 2739static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
b095518e
JG		 2740{
2741 struct ata_taskfile *tf = &(qc->tf);
542b1444 2742 struct scsi_cmnd *scmd = qc->scsicmd;
f79d409f 2743 struct ata_device *dev = qc->dev;
ad706991 2744 const u8 *cdb = scmd->cmnd;
b095518e 2745
542b1444 2746 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
9a405257 2747 goto invalid_fld;
8190bdb9 2748
ae8d4ee7
AC		 2749 /*
2750 * Filter TPM commands by default. These provide an
2751 * essentially uncontrolled encrypted "back door" between
2752 * applications and the disk. Set libata.allow_tpm=1 if you
2753 * have a real reason for wanting to use them. This ensures
2754 * that installed software cannot easily mess stuff up without
2755 * user intent. DVR type users will probably ship with this enabled
2756 * for movie content management.
2757 *
2758 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
2759 * for this and should do in future but that it is not sufficient as
2760 * DCS is an optional feature set. Thus we also do the software filter
2761 * so that we comply with the TC consortium stated goal that the user
2762 * can turn off TC features of their system.
2763 */
2764 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
2765 goto invalid_fld;
2766
f79d409f
AC		 2767 /* We may not issue DMA commands if no DMA mode is set */
2768 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2769 goto invalid_fld;
b095518e
JG		 2770
2771 /*
2772 * 12 and 16 byte CDBs use different offsets to
2773 * provide the various register values.
2774 */
542b1444 2775 if (cdb[0] == ATA_16) {
b095518e
JG		 2776 /*
2777 * 16-byte CDB - may contain extended commands.
2778 *
2779 * If that is the case, copy the upper byte register values.
2780 */
542b1444
TH		 2781 if (cdb[1] & 0x01) {
2782 tf->hob_feature = cdb[3];
2783 tf->hob_nsect = cdb[5];
2784 tf->hob_lbal = cdb[7];
2785 tf->hob_lbam = cdb[9];
2786 tf->hob_lbah = cdb[11];
b095518e
JG		 2787 tf->flags |= ATA_TFLAG_LBA48;
2788 } else
2789 tf->flags &= ~ATA_TFLAG_LBA48;
2790
2791 /*
2792 * Always copy low byte, device and command registers.
2793 */
542b1444
TH		 2794 tf->feature = cdb[4];
2795 tf->nsect = cdb[6];
2796 tf->lbal = cdb[8];
2797 tf->lbam = cdb[10];
2798 tf->lbah = cdb[12];
2799 tf->device = cdb[13];
2800 tf->command = cdb[14];
b095518e
JG		 2801 } else {
2802 /*
2803 * 12-byte CDB - incapable of extended commands.
2804 */
2805 tf->flags &= ~ATA_TFLAG_LBA48;
2806
542b1444
TH		 2807 tf->feature = cdb[3];
2808 tf->nsect = cdb[4];
2809 tf->lbal = cdb[5];
2810 tf->lbam = cdb[6];
2811 tf->lbah = cdb[7];
2812 tf->device = cdb[8];
2813 tf->command = cdb[9];
b095518e 2814 }
fa4453c4
AL		 2815
2816 /* enforce correct master/slave bit */
2817 tf->device = dev->devno ?
2818 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
b095518e 2819
1dce589c
AL		 2820 /* sanity check for pio multi commands */
2821 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
2822 goto invalid_fld;
2823
2824 if (is_multi_taskfile(tf)) {
2825 unsigned int multi_count = 1 << (cdb[1] >> 5);
2826
2827 /* compare the passed through multi_count
2828 * with the cached multi_count of libata
2829 */
2830 if (multi_count != dev->multi_count)
2831 ata_dev_printk(dev, KERN_WARNING,
2832 "invalid multi_count %u ignored\n",
2833 multi_count);
d26fc955 2834 }
1dce589c 2835
5a5dbd18
ML		 2836 /* READ/WRITE LONG use a non-standard sect_size */
2837 qc->sect_size = ATA_SECT_SIZE;
2838 switch (tf->command) {
2839 case ATA_CMD_READ_LONG:
2840 case ATA_CMD_READ_LONG_ONCE:
2841 case ATA_CMD_WRITE_LONG:
2842 case ATA_CMD_WRITE_LONG_ONCE:
2843 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2844 goto invalid_fld;
7120165c 2845 qc->sect_size = scsi_bufflen(scmd);
5a5dbd18
ML		 2846 }
2847
b095518e
JG		 2848 /*
2849 * Filter SET_FEATURES - XFER MODE command -- otherwise,
2850 * SET_FEATURES - XFER MODE must be preceded/succeeded
2851 * by an update to hardware-specific registers for each
2852 * controller (i.e. the reason for ->set_piomode(),
2853 * ->set_dmamode(), and ->post_set_mode() hooks).
2854 */
2855 if ((tf->command == ATA_CMD_SET_FEATURES)
2856 && (tf->feature == SETFEATURES_XFER))
9a405257 2857 goto invalid_fld;
b095518e
JG		 2858
2859 /*
2860 * Set flags so that all registers will be written,
2861 * and pass on write indication (used for PIO/DMA
2862 * setup.)
2863 */
2864 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
2865
542b1444 2866 if (scmd->sc_data_direction == DMA_TO_DEVICE)
b095518e
JG		 2867 tf->flags |= ATA_TFLAG_WRITE;
2868
2869 /*
2870 * Set transfer length.
2871 *
2872 * TODO: find out if we need to do more here to
2873 * cover scatter/gather case.
2874 */
aacda375 2875 ata_qc_set_pc_nbytes(qc);
b095518e 2876
e027bd36
TH		 2877 /* request result TF and be quiet about device error */
2878 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
e61e0672 2879
b095518e 2880 return 0;
9a405257
TH		 2881
2882 invalid_fld:
542b1444 2883 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
9a405257
TH		 2884 /* "Invalid field in cdb" */
2885 return 1;
b095518e
JG		 2886}
2887
1da177e4
LT		 2888/**
2889 * ata_get_xlat_func - check if SCSI to ATA translation is possible
2890 * @dev: ATA device
2891 * @cmd: SCSI command opcode to consider
2892 *
2893 * Look up the SCSI command given, and determine whether the
2894 * SCSI command is to be translated or simulated.
2895 *
2896 * RETURNS:
2897 * Pointer to translation function if possible, %NULL if not.
2898 */
2899
2900static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
2901{
2902 switch (cmd) {
2903 case READ_6:
2904 case READ_10:
2905 case READ_16:
2906
2907 case WRITE_6:
2908 case WRITE_10:
2909 case WRITE_16:
2910 return ata_scsi_rw_xlat;
2911
2912 case SYNCHRONIZE_CACHE:
2913 if (ata_try_flush_cache(dev))
2914 return ata_scsi_flush_xlat;
2915 break;
2916
2917 case VERIFY:
2918 case VERIFY_16:
2919 return ata_scsi_verify_xlat;
b095518e
JG		 2920
2921 case ATA_12:
2922 case ATA_16:
2923 return ata_scsi_pass_thru;
da61396d 2924
972dcafb
DG		 2925 case START_STOP:
2926 return ata_scsi_start_stop_xlat;
1da177e4
LT		 2927 }
2928
2929 return NULL;
2930}
2931
2932/**
2933 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
2934 * @ap: ATA port to which the command was being sent
2935 * @cmd: SCSI command to dump
2936 *
2937 * Prints the contents of a SCSI command via printk().
2938 */
2939
2940static inline void ata_scsi_dump_cdb(struct ata_port *ap,
2941 struct scsi_cmnd *cmd)
2942{
2943#ifdef ATA_DEBUG
2944 struct scsi_device *scsidev = cmd->device;
2945 u8 *scsicmd = cmd->cmnd;
2946
2947 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
44877b4e 2948 ap->print_id,
1da177e4
LT		 2949 scsidev->channel, scsidev->id, scsidev->lun,
2950 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
2951 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
2952 scsicmd[8]);
2953#endif
2954}
2955
542b1444 2956static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2115ea94
TH		 2957 void (*done)(struct scsi_cmnd *),
2958 struct ata_device *dev)
eb3f0f9c 2959{
baf4fdfa
ML		 2960 u8 scsi_op = scmd->cmnd[0];
2961 ata_xlat_func_t xlat_func;
2115ea94
TH		 2962 int rc = 0;
2963
eb3f0f9c 2964 if (dev->class == ATA_DEV_ATA) {
baf4fdfa
ML		 2965 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
2966 goto bad_cdb_len;
eb3f0f9c 2967
baf4fdfa
ML		 2968 xlat_func = ata_get_xlat_func(dev, scsi_op);
2969 } else {
2970 if (unlikely(!scmd->cmd_len))
2971 goto bad_cdb_len;
2972
2973 xlat_func = NULL;
2974 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
2975 /* relay SCSI command to ATAPI device */
607126c2
ML		 2976 int len = COMMAND_SIZE(scsi_op);
2977 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
baf4fdfa
ML		 2978 goto bad_cdb_len;
2979
2980 xlat_func = atapi_xlat;
2981 } else {
2982 /* ATA_16 passthru, treat as an ATA command */
2983 if (unlikely(scmd->cmd_len > 16))
2984 goto bad_cdb_len;
2985
2986 xlat_func = ata_get_xlat_func(dev, scsi_op);
2987 }
2988 }
2989
2990 if (xlat_func)
2991 rc = ata_scsi_translate(dev, scmd, done, xlat_func);
2992 else
2993 ata_scsi_simulate(dev, scmd, done);
2115ea94
TH		 2994
2995 return rc;
baf4fdfa
ML		 2996
2997 bad_cdb_len:
2998 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
2999 scmd->cmd_len, scsi_op, dev->cdb_len);
3000 scmd->result = DID_ERROR << 16;
3001 done(scmd);
3002 return 0;
eb3f0f9c
BK		 3003}
3004
1da177e4
LT		 3005/**
3006 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3007 * @cmd: SCSI command to be sent
3008 * @done: Completion function, called when command is complete
3009 *
3010 * In some cases, this function translates SCSI commands into
3011 * ATA taskfiles, and queues the taskfiles to be sent to
3012 * hardware. In other cases, this function simulates a
3013 * SCSI device by evaluating and responding to certain
3014 * SCSI commands. This creates the overall effect of
3015 * ATA and ATAPI devices appearing as SCSI devices.
3016 *
3017 * LOCKING:
cca3974e 3018 * Releases scsi-layer-held lock, and obtains host lock.
1da177e4
LT		 3019 *
3020 * RETURNS:
2115ea94
TH		 3021 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3022 * 0 otherwise.
1da177e4 3023 */
1da177e4
LT		 3024int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
3025{
3026 struct ata_port *ap;
3027 struct ata_device *dev;
3028 struct scsi_device *scsidev = cmd->device;
005a5a06 3029 struct Scsi_Host *shost = scsidev->host;
2115ea94 3030 int rc = 0;
1da177e4 3031
35bb94b1 3032 ap = ata_shost_to_port(shost);
005a5a06
JG		 3033
3034 spin_unlock(shost->host_lock);
ba6a1308 3035 spin_lock(ap->lock);
1da177e4
LT		 3036
3037 ata_scsi_dump_cdb(ap, cmd);
3038
3039 dev = ata_scsi_find_dev(ap, scsidev);
eb3f0f9c 3040 if (likely(dev))
2115ea94 3041 rc = __ata_scsi_queuecmd(cmd, done, dev);
eb3f0f9c 3042 else {
1da177e4
LT		 3043 cmd->result = (DID_BAD_TARGET << 16);
3044 done(cmd);
1da177e4
LT		 3045 }
3046
ba6a1308 3047 spin_unlock(ap->lock);
005a5a06 3048 spin_lock(shost->host_lock);
2115ea94 3049 return rc;
1da177e4
LT		 3050}
3051
3052/**
3053 * ata_scsi_simulate - simulate SCSI command on ATA device
c893a3ae 3054 * @dev: the target device
1da177e4
LT		 3055 * @cmd: SCSI command being sent to device.
3056 * @done: SCSI command completion function.
3057 *
3058 * Interprets and directly executes a select list of SCSI commands
3059 * that can be handled internally.
3060 *
3061 * LOCKING:
cca3974e 3062 * spin_lock_irqsave(host lock)
1da177e4
LT		 3063 */
3064
3373efd8 3065void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
1da177e4
LT		 3066 void (*done)(struct scsi_cmnd *))
3067{
3068 struct ata_scsi_args args;
057ace5e 3069 const u8 *scsicmd = cmd->cmnd;
45394145 3070 u8 tmp8;
1da177e4 3071
9a3dccc4
TH		 3072 args.dev = dev;
3073 args.id = dev->id;
1da177e4
LT		 3074 args.cmd = cmd;
3075 args.done = done;
3076
3077 switch(scsicmd[0]) {
2dcb407e
JG		 3078 /* TODO: worth improving? */
3079 case FORMAT_UNIT:
3080 ata_scsi_invalid_field(cmd, done);
3081 break;
3082
3083 case INQUIRY:
3084 if (scsicmd[1] & 2) /* is CmdDt set? */
00bd0202 3085 ata_scsi_invalid_field(cmd, done);
2dcb407e
JG		 3086 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3087 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3088 else switch (scsicmd[2]) {
3089 case 0x00:
3090 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
1da177e4 3091 break;
2dcb407e
JG		 3092 case 0x80:
3093 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
1da177e4 3094 break;
2dcb407e
JG		 3095 case 0x83:
3096 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
1da177e4 3097 break;
2dcb407e
JG		 3098 case 0x89:
3099 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3100 break;
1e9dbc92
MW		 3101 case 0xb1:
3102 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3103 break;
2dcb407e 3104 default:
ae006510 3105 ata_scsi_invalid_field(cmd, done);
1da177e4 3106 break;
2dcb407e
JG		 3107 }
3108 break;
3109
3110 case MODE_SENSE:
3111 case MODE_SENSE_10:
3112 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3113 break;
3114
3115 case MODE_SELECT: /* unconditionally return */
3116 case MODE_SELECT_10: /* bad-field-in-cdb */
3117 ata_scsi_invalid_field(cmd, done);
3118 break;
1da177e4 3119
2dcb407e
JG		 3120 case READ_CAPACITY:
3121 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3122 break;
3123
3124 case SERVICE_ACTION_IN:
3125 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
1da177e4 3126 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2dcb407e
JG		 3127 else
3128 ata_scsi_invalid_field(cmd, done);
3129 break;
1da177e4 3130
2dcb407e
JG		 3131 case REPORT_LUNS:
3132 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3133 break;
1da177e4 3134
2dcb407e
JG		 3135 case REQUEST_SENSE:
3136 ata_scsi_set_sense(cmd, 0, 0, 0);
3137 cmd->result = (DRIVER_SENSE << 24);
3138 done(cmd);
3139 break;
1da177e4 3140
2dcb407e
JG		 3141 /* if we reach this, then writeback caching is disabled,
3142 * turning this into a no-op.
3143 */
3144 case SYNCHRONIZE_CACHE:
3145 /* fall through */
3146
3147 /* no-op's, complete with success */
3148 case REZERO_UNIT:
3149 case SEEK_6:
3150 case SEEK_10:
3151 case TEST_UNIT_READY:
3152 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3153 break;
45394145 3154
2dcb407e
JG		 3155 case SEND_DIAGNOSTIC:
3156 tmp8 = scsicmd[1] & ~(1 << 3);
3157 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
00bd0202 3158 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
2dcb407e
JG		 3159 else
3160 ata_scsi_invalid_field(cmd, done);
3161 break;
1da177e4 3162
2dcb407e
JG		 3163 /* all other commands */
3164 default:
3165 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3166 /* "Invalid command operation code" */
3167 done(cmd);
3168 break;
1da177e4
LT		 3169 }
3170}
3171
f3187195
TH		 3172int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3173{
3174 int i, rc;
3175
3176 for (i = 0; i < host->n_ports; i++) {
3177 struct ata_port *ap = host->ports[i];
3178 struct Scsi_Host *shost;
3179
3180 rc = -ENOMEM;
3181 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3182 if (!shost)
3183 goto err_alloc;
3184
3185 *(struct ata_port **)&shost->hostdata[0] = ap;
3186 ap->scsi_host = shost;
3187
3188 shost->transportt = &ata_scsi_transport_template;
3189 shost->unique_id = ap->print_id;
3190 shost->max_id = 16;
3191 shost->max_lun = 1;
3192 shost->max_channel = 1;
3193 shost->max_cmd_len = 16;
3194
31cc23b3
TH		 3195 /* Schedule policy is determined by ->qc_defer()
3196 * callback and it needs to see every deferred qc.
3197 * Set host_blocked to 1 to prevent SCSI midlayer from
3198 * automatically deferring requests.
3199 */
3200 shost->max_host_blocked = 1;
3201
f3187195
TH		 3202 rc = scsi_add_host(ap->scsi_host, ap->host->dev);
3203 if (rc)
3204 goto err_add;
3205 }
3206
3207 return 0;
3208
3209 err_add:
3210 scsi_host_put(host->ports[i]->scsi_host);
3211 err_alloc:
3212 while (--i >= 0) {
3213 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3214
3215 scsi_remove_host(shost);
3216 scsi_host_put(shost);
3217 }
3218 return rc;
3219}
3220
1ae46317 3221void ata_scsi_scan_host(struct ata_port *ap, int sync)
644dd0cc 3222{
1ae46317
TH		 3223 int tries = 5;
3224 struct ata_device *last_failed_dev = NULL;
41bda9c9 3225 struct ata_link *link;
1ae46317 3226 struct ata_device *dev;
644dd0cc 3227
198e0fed 3228 if (ap->flags & ATA_FLAG_DISABLED)
644dd0cc
JG		 3229 return;
3230
1ae46317 3231 repeat:
41bda9c9
TH		 3232 ata_port_for_each_link(link, ap) {
3233 ata_link_for_each_dev(dev, link) {
3234 struct scsi_device *sdev;
3235 int channel = 0, id = 0;
3edebac4 3236
41bda9c9
TH		 3237 if (!ata_dev_enabled(dev) || dev->sdev)
3238 continue;
3f19ee8c 3239
41bda9c9
TH		 3240 if (ata_is_host_link(link))
3241 id = dev->devno;
3242 else
3243 channel = link->pmp;
3244
3245 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3246 NULL);
3247 if (!IS_ERR(sdev)) {
3248 dev->sdev = sdev;
3249 scsi_device_put(sdev);
3250 }
3edebac4 3251 }
3f19ee8c 3252 }
1ae46317
TH		 3253
3254 /* If we scanned while EH was in progress or allocation
3255 * failure occurred, scan would have failed silently. Check
3256 * whether all devices are attached.
3257 */
41bda9c9
TH		 3258 ata_port_for_each_link(link, ap) {
3259 ata_link_for_each_dev(dev, link) {
3260 if (ata_dev_enabled(dev) && !dev->sdev)
3261 goto exit_loop;
3262 }
1ae46317 3263 }
41bda9c9
TH		 3264 exit_loop:
3265 if (!link)
1ae46317
TH		 3266 return;
3267
3268 /* we're missing some SCSI devices */
3269 if (sync) {
3270 /* If caller requested synchrnous scan && we've made
3271 * any progress, sleep briefly and repeat.
3272 */
3273 if (dev != last_failed_dev) {
3274 msleep(100);
3275 last_failed_dev = dev;
3276 goto repeat;
3277 }
3278
3279 /* We might be failing to detect boot device, give it
3280 * a few more chances.
3281 */
3282 if (--tries) {
3283 msleep(100);
3284 goto repeat;
3285 }
3286
3287 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan "
3288 "failed without making any progress,\n"
3289 " switching to async\n");
3290 }
3291
3292 queue_delayed_work(ata_aux_wq, &ap->hotplug_task,
3293 round_jiffies_relative(HZ));
644dd0cc 3294}
0ea035a3
TH		 3295
3296/**
3297 * ata_scsi_offline_dev - offline attached SCSI device
3298 * @dev: ATA device to offline attached SCSI device for
3299 *
3300 * This function is called from ata_eh_hotplug() and responsible
3301 * for taking the SCSI device attached to @dev offline. This
cca3974e 3302 * function is called with host lock which protects dev->sdev
0ea035a3
TH		 3303 * against clearing.
3304 *
3305 * LOCKING:
cca3974e 3306 * spin_lock_irqsave(host lock)
0ea035a3
TH		 3307 *
3308 * RETURNS:
3309 * 1 if attached SCSI device exists, 0 otherwise.
3310 */
3311int ata_scsi_offline_dev(struct ata_device *dev)
3312{
3313 if (dev->sdev) {
3314 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3315 return 1;
3316 }
3317 return 0;
3318}
580b2102
TH		 3319
3320/**
3321 * ata_scsi_remove_dev - remove attached SCSI device
3322 * @dev: ATA device to remove attached SCSI device for
3323 *
3324 * This function is called from ata_eh_scsi_hotplug() and
3325 * responsible for removing the SCSI device attached to @dev.
3326 *
3327 * LOCKING:
3328 * Kernel thread context (may sleep).
3329 */
3330static void ata_scsi_remove_dev(struct ata_device *dev)
3331{
9af5c9c9 3332 struct ata_port *ap = dev->link->ap;
580b2102
TH		 3333 struct scsi_device *sdev;
3334 unsigned long flags;
3335
3336 /* Alas, we need to grab scan_mutex to ensure SCSI device
3337 * state doesn't change underneath us and thus
3338 * scsi_device_get() always succeeds. The mutex locking can
3339 * be removed if there is __scsi_device_get() interface which
3340 * increments reference counts regardless of device state.
3341 */
cca3974e 3342 mutex_lock(&ap->scsi_host->scan_mutex);
ba6a1308 3343 spin_lock_irqsave(ap->lock, flags);
580b2102 3344
cca3974e 3345 /* clearing dev->sdev is protected by host lock */
580b2102
TH		 3346 sdev = dev->sdev;
3347 dev->sdev = NULL;
3348
3349 if (sdev) {
3350 /* If user initiated unplug races with us, sdev can go
cca3974e 3351 * away underneath us after the host lock and
580b2102
TH		 3352 * scan_mutex are released. Hold onto it.
3353 */
3354 if (scsi_device_get(sdev) == 0) {
3355 /* The following ensures the attached sdev is
3356 * offline on return from ata_scsi_offline_dev()
3357 * regardless it wins or loses the race
3358 * against this function.
3359 */
3360 scsi_device_set_state(sdev, SDEV_OFFLINE);
3361 } else {
3362 WARN_ON(1);
3363 sdev = NULL;
3364 }
3365 }
3366
ba6a1308 3367 spin_unlock_irqrestore(ap->lock, flags);
cca3974e 3368 mutex_unlock(&ap->scsi_host->scan_mutex);
580b2102
TH		 3369
3370 if (sdev) {
3371 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
3372 sdev->sdev_gendev.bus_id);
3373
3374 scsi_remove_device(sdev);
3375 scsi_device_put(sdev);
3376 }
3377}
3378
41bda9c9
TH		 3379static void ata_scsi_handle_link_detach(struct ata_link *link)
3380{
3381 struct ata_port *ap = link->ap;
3382 struct ata_device *dev;
3383
3384 ata_link_for_each_dev(dev, link) {
3385 unsigned long flags;
3386
3387 if (!(dev->flags & ATA_DFLAG_DETACHED))
3388 continue;
3389
3390 spin_lock_irqsave(ap->lock, flags);
3391 dev->flags &= ~ATA_DFLAG_DETACHED;
3392 spin_unlock_irqrestore(ap->lock, flags);
3393
3394 ata_scsi_remove_dev(dev);
3395 }
3396}
3397
2f294968
KCA		 3398/**
3399 * ata_scsi_media_change_notify - send media change event
c5d0e6a0 3400 * @dev: Pointer to the disk device with media change event
2f294968
KCA		 3401 *
3402 * Tell the block layer to send a media change notification
3403 * event.
3404 *
3405 * LOCKING:
854c73a2 3406 * spin_lock_irqsave(host lock)
2f294968 3407 */
854c73a2 3408void ata_scsi_media_change_notify(struct ata_device *dev)
2f294968 3409{
854c73a2 3410 if (dev->sdev)
f26792d5
JG		 3411 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3412 GFP_ATOMIC);
2f294968 3413}
2f294968 3414
580b2102
TH		 3415/**
3416 * ata_scsi_hotplug - SCSI part of hotplug
65f27f38 3417 * @work: Pointer to ATA port to perform SCSI hotplug on
580b2102
TH		 3418 *
3419 * Perform SCSI part of hotplug. It's executed from a separate
3420 * workqueue after EH completes. This is necessary because SCSI
3421 * hot plugging requires working EH and hot unplugging is
3422 * synchronized with hot plugging with a mutex.
3423 *
3424 * LOCKING:
3425 * Kernel thread context (may sleep).
3426 */
65f27f38 3427void ata_scsi_hotplug(struct work_struct *work)
580b2102 3428{
65f27f38
DH		 3429 struct ata_port *ap =
3430 container_of(work, struct ata_port, hotplug_task.work);
41bda9c9 3431 int i;
580b2102 3432
b51e9e5d 3433 if (ap->pflags & ATA_PFLAG_UNLOADING) {
580b2102
TH		 3434 DPRINTK("ENTER/EXIT - unloading\n");
3435 return;
3436 }
3437
3438 DPRINTK("ENTER\n");
3439
41bda9c9
TH		 3440 /* Unplug detached devices. We cannot use link iterator here
3441 * because PMP links have to be scanned even if PMP is
3442 * currently not attached. Iterate manually.
3443 */
3444 ata_scsi_handle_link_detach(&ap->link);
3445 if (ap->pmp_link)
3446 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3447 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
580b2102
TH		 3448
3449 /* scan for new ones */
1ae46317 3450 ata_scsi_scan_host(ap, 0);
580b2102
TH		 3451
3452 DPRINTK("EXIT\n");
3453}
83c47bcb
TH		 3454
3455/**
3456 * ata_scsi_user_scan - indication for user-initiated bus scan
3457 * @shost: SCSI host to scan
3458 * @channel: Channel to scan
3459 * @id: ID to scan
3460 * @lun: LUN to scan
3461 *
3462 * This function is called when user explicitly requests bus
3463 * scan. Set probe pending flag and invoke EH.
3464 *
3465 * LOCKING:
3466 * SCSI layer (we don't care)
3467 *
3468 * RETURNS:
3469 * Zero.
3470 */
3471static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3472 unsigned int id, unsigned int lun)
3473{
3474 struct ata_port *ap = ata_shost_to_port(shost);
3475 unsigned long flags;
41bda9c9 3476 int devno, rc = 0;
83c47bcb
TH		 3477
3478 if (!ap->ops->error_handler)
3479 return -EOPNOTSUPP;
3480
41bda9c9 3481 if (lun != SCAN_WILD_CARD && lun)
83c47bcb
TH		 3482 return -EINVAL;
3483
071f44b1 3484 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 3485 if (channel != SCAN_WILD_CARD && channel)
3486 return -EINVAL;
3487 devno = id;
3488 } else {
3489 if (id != SCAN_WILD_CARD && id)
3490 return -EINVAL;
3491 devno = channel;
3492 }
3493
ba6a1308 3494 spin_lock_irqsave(ap->lock, flags);
83c47bcb 3495
41bda9c9
TH		 3496 if (devno == SCAN_WILD_CARD) {
3497 struct ata_link *link;
3498
3499 ata_port_for_each_link(link, ap) {
3500 struct ata_eh_info *ehi = &link->eh_info;
b558eddd 3501 ehi->probe_mask |= ATA_ALL_DEVICES;
cf480626 3502 ehi->action |= ATA_EH_RESET;
41bda9c9 3503 }
83c47bcb 3504 } else {
41bda9c9 3505 struct ata_device *dev = ata_find_dev(ap, devno);
83c47bcb
TH		 3506
3507 if (dev) {
41bda9c9 3508 struct ata_eh_info *ehi = &dev->link->eh_info;
9af5c9c9 3509 ehi->probe_mask |= 1 << dev->devno;
cf480626 3510 ehi->action |= ATA_EH_RESET;
83c47bcb
TH		 3511 } else
3512 rc = -EINVAL;
3513 }
3514
309afcb5 3515 if (rc == 0) {
83c47bcb 3516 ata_port_schedule_eh(ap);
309afcb5
TH		 3517 spin_unlock_irqrestore(ap->lock, flags);
3518 ata_port_wait_eh(ap);
3519 } else
3520 spin_unlock_irqrestore(ap->lock, flags);
83c47bcb
TH		 3521
3522 return rc;
3523}
3057ac3c 3524
3525/**
d0171269 3526 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
65f27f38 3527 * @work: Pointer to ATA port to perform scsi_rescan_device()
3057ac3c 3528 *
d0171269
TH		 3529 * After ATA pass thru (SAT) commands are executed successfully,
3530 * libata need to propagate the changes to SCSI layer. This
3531 * function must be executed from ata_aux_wq such that sdev
3532 * attach/detach don't race with rescan.
3057ac3c 3533 *
d0171269
TH		 3534 * LOCKING:
3535 * Kernel thread context (may sleep).
3057ac3c 3536 */
65f27f38 3537void ata_scsi_dev_rescan(struct work_struct *work)
3057ac3c 3538{
65f27f38
DH		 3539 struct ata_port *ap =
3540 container_of(work, struct ata_port, scsi_rescan_task);
41bda9c9 3541 struct ata_link *link;
f58229f8 3542 struct ata_device *dev;
f84e7e41 3543 unsigned long flags;
3057ac3c 3544
f84e7e41
TH		 3545 spin_lock_irqsave(ap->lock, flags);
3546
41bda9c9
TH		 3547 ata_port_for_each_link(link, ap) {
3548 ata_link_for_each_dev(dev, link) {
3549 struct scsi_device *sdev = dev->sdev;
3057ac3c 3550
41bda9c9
TH		 3551 if (!ata_dev_enabled(dev) || !sdev)
3552 continue;
3553 if (scsi_device_get(sdev))
3554 continue;
f84e7e41 3555
41bda9c9
TH		 3556 spin_unlock_irqrestore(ap->lock, flags);
3557 scsi_rescan_device(&(sdev->sdev_gendev));
3558 scsi_device_put(sdev);
3559 spin_lock_irqsave(ap->lock, flags);
3560 }
3057ac3c 3561 }
f84e7e41
TH		 3562
3563 spin_unlock_irqrestore(ap->lock, flags);
3057ac3c 3564}
80289167
BK		 3565
3566/**
3567 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
4f931374 3568 * @host: ATA host container for all SAS ports
80289167 3569 * @port_info: Information from low-level host driver
cca3974e 3570 * @shost: SCSI host that the scsi device is attached to
80289167
BK		 3571 *
3572 * LOCKING:
3573 * PCI/etc. bus probe sem.
3574 *
3575 * RETURNS:
3576 * ata_port pointer on success / NULL on failure.
3577 */
3578
cca3974e 3579struct ata_port *ata_sas_port_alloc(struct ata_host *host,
80289167 3580 struct ata_port_info *port_info,
cca3974e 3581 struct Scsi_Host *shost)
80289167 3582{
f3187195 3583 struct ata_port *ap;
80289167 3584
f3187195 3585 ap = ata_port_alloc(host);
80289167
BK		 3586 if (!ap)
3587 return NULL;
3588
f3187195 3589 ap->port_no = 0;
cca3974e 3590 ap->lock = shost->host_lock;
f3187195
TH		 3591 ap->pio_mask = port_info->pio_mask;
3592 ap->mwdma_mask = port_info->mwdma_mask;
3593 ap->udma_mask = port_info->udma_mask;
3594 ap->flags |= port_info->flags;
3595 ap->ops = port_info->port_ops;
3596 ap->cbl = ATA_CBL_SATA;
3597
80289167
BK		 3598 return ap;
3599}
3600EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3601
3602/**
3603 * ata_sas_port_start - Set port up for dma.
3604 * @ap: Port to initialize
3605 *
3606 * Called just after data structures for each port are
dde20207 3607 * initialized.
80289167
BK		 3608 *
3609 * May be used as the port_start() entry in ata_port_operations.
3610 *
3611 * LOCKING:
3612 * Inherited from caller.
3613 */
3614int ata_sas_port_start(struct ata_port *ap)
3615{
dde20207 3616 return 0;
80289167
BK		 3617}
3618EXPORT_SYMBOL_GPL(ata_sas_port_start);
3619
3620/**
3621 * ata_port_stop - Undo ata_sas_port_start()
3622 * @ap: Port to shut down
3623 *
80289167
BK		 3624 * May be used as the port_stop() entry in ata_port_operations.
3625 *
3626 * LOCKING:
3627 * Inherited from caller.
3628 */
3629
3630void ata_sas_port_stop(struct ata_port *ap)
3631{
80289167
BK		 3632}
3633EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3634
3635/**
3636 * ata_sas_port_init - Initialize a SATA device
3637 * @ap: SATA port to initialize
3638 *
3639 * LOCKING:
3640 * PCI/etc. bus probe sem.
3641 *
3642 * RETURNS:
3643 * Zero on success, non-zero on error.
3644 */
3645
3646int ata_sas_port_init(struct ata_port *ap)
3647{
3648 int rc = ap->ops->port_start(ap);
3649
f3187195
TH		 3650 if (!rc) {
3651 ap->print_id = ata_print_id++;
80289167 3652 rc = ata_bus_probe(ap);
f3187195 3653 }
80289167
BK		 3654
3655 return rc;
3656}
3657EXPORT_SYMBOL_GPL(ata_sas_port_init);
3658
3659/**
3660 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3661 * @ap: SATA port to destroy
3662 *
3663 */
3664
3665void ata_sas_port_destroy(struct ata_port *ap)
3666{
f0d36efd
TH		 3667 if (ap->ops->port_stop)
3668 ap->ops->port_stop(ap);
80289167
BK		 3669 kfree(ap);
3670}
3671EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3672
3673/**
3674 * ata_sas_slave_configure - Default slave_config routine for libata devices
3675 * @sdev: SCSI device to configure
3676 * @ap: ATA port to which SCSI device is attached
3677 *
3678 * RETURNS:
3679 * Zero.
3680 */
3681
3682int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
3683{
3684 ata_scsi_sdev_config(sdev);
9af5c9c9 3685 ata_scsi_dev_config(sdev, ap->link.device);
80289167
BK		 3686 return 0;
3687}
3688EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3689
3690/**
3691 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3692 * @cmd: SCSI command to be sent
3693 * @done: Completion function, called when command is complete
3694 * @ap: ATA port to which the command is being sent
3695 *
3696 * RETURNS:
08475a19
BK		 3697 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3698 * 0 otherwise.
80289167
BK		 3699 */
3700
3701int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
3702 struct ata_port *ap)
3703{
08475a19
BK		 3704 int rc = 0;
3705
80289167
BK		 3706 ata_scsi_dump_cdb(ap, cmd);
3707
2486fa56 3708 if (likely(ata_dev_enabled(ap->link.device)))
9af5c9c9 3709 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device);
80289167
BK		 3710 else {
3711 cmd->result = (DID_BAD_TARGET << 16);
3712 done(cmd);
3713 }
08475a19 3714 return rc;
80289167
BK		 3715}
3716EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
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