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Merge tag 'ntb-4.4' of git://github.com/jonmason/ntb
[deliverable/linux.git] / drivers / ata / libata-scsi.c
CommitLineData
1da177e4 1/*
af36d7f0
JG		 2 * libata-scsi.c - helper library for ATA
3 *
8c3d3d4b 4 * Maintained by: Tejun Heo <tj@kernel.org>
af36d7f0
JG		 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
5a0e3ad6 36#include <linux/slab.h>
1da177e4
LT		 37#include <linux/kernel.h>
38#include <linux/blkdev.h>
39#include <linux/spinlock.h>
38789fda 40#include <linux/export.h>
1da177e4 41#include <scsi/scsi.h>
1da177e4 42#include <scsi/scsi_host.h>
beb40487 43#include <scsi/scsi_cmnd.h>
85837ebd 44#include <scsi/scsi_eh.h>
005a5a06 45#include <scsi/scsi_device.h>
a6e6ce8e 46#include <scsi/scsi_tcq.h>
30afc84c 47#include <scsi/scsi_transport.h>
1da177e4 48#include <linux/libata.h>
b095518e 49#include <linux/hdreg.h>
2dcb407e 50#include <linux/uaccess.h>
2a6e58d2 51#include <linux/suspend.h>
18f0f978 52#include <asm/unaligned.h>
1da177e4
LT		 53
54#include "libata.h"
d9027470 55#include "libata-transport.h"
1da177e4 56
87340e98
TH		 57#define ATA_SCSI_RBUF_SIZE 4096
58
59static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
60static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
b095518e 61
ad706991 62typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
ab5b3a5b 63
2dcb407e 64static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
ab5b3a5b 65 const struct scsi_device *scsidev);
2dcb407e 66static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
ab5b3a5b 67 const struct scsi_device *scsidev);
1da177e4 68
00ac37f5
DG		 69#define RW_RECOVERY_MPAGE 0x1
70#define RW_RECOVERY_MPAGE_LEN 12
71#define CACHE_MPAGE 0x8
72#define CACHE_MPAGE_LEN 20
73#define CONTROL_MPAGE 0xa
74#define CONTROL_MPAGE_LEN 12
75#define ALL_MPAGES 0x3f
76#define ALL_SUB_MPAGES 0xff
77
78
24f75686 79static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
00ac37f5
DG		 80 RW_RECOVERY_MPAGE,
81 RW_RECOVERY_MPAGE_LEN - 2,
24f75686 82 (1 << 7), /* AWRE */
00ac37f5
DG		 83 0, /* read retry count */
84 0, 0, 0, 0,
85 0, /* write retry count */
86 0, 0, 0
87};
88
89static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
90 CACHE_MPAGE,
91 CACHE_MPAGE_LEN - 2,
92 0, /* contains WCE, needs to be 0 for logic */
93 0, 0, 0, 0, 0, 0, 0, 0, 0,
94 0, /* contains DRA, needs to be 0 for logic */
95 0, 0, 0, 0, 0, 0, 0
96};
97
98static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
99 CONTROL_MPAGE,
100 CONTROL_MPAGE_LEN - 2,
101 2, /* DSENSE=0, GLTSD=1 */
102 0, /* [QAM+QERR may be 1, see 05-359r1] */
103 0, 0, 0, 0, 0xff, 0xff,
104 0, 30 /* extended self test time, see 05-359r1 */
105};
106
c93b263e
TH		 107static const char *ata_lpm_policy_names[] = {
108 [ATA_LPM_UNKNOWN] = "max_performance",
109 [ATA_LPM_MAX_POWER] = "max_performance",
110 [ATA_LPM_MED_POWER] = "medium_power",
111 [ATA_LPM_MIN_POWER] = "min_power",
ca77329f
KCA		 112};
113
ecd75ad5 114static ssize_t ata_scsi_lpm_store(struct device *device,
c93b263e
TH		 115 struct device_attribute *attr,
116 const char *buf, size_t count)
ca77329f 117{
ecd75ad5 118 struct Scsi_Host *shost = class_to_shost(device);
ca77329f 119 struct ata_port *ap = ata_shost_to_port(shost);
ecd75ad5
TH		 120 struct ata_link *link;
121 struct ata_device *dev;
c93b263e 122 enum ata_lpm_policy policy;
6b7ae954 123 unsigned long flags;
c93b263e
TH		 124
125 /* UNKNOWN is internal state, iterate from MAX_POWER */
126 for (policy = ATA_LPM_MAX_POWER;
127 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
128 const char *name = ata_lpm_policy_names[policy];
129
130 if (strncmp(name, buf, strlen(name)) == 0)
ca77329f 131 break;
ca77329f 132 }
c93b263e 133 if (policy == ARRAY_SIZE(ata_lpm_policy_names))
ca77329f
KCA		 134 return -EINVAL;
135
6b7ae954 136 spin_lock_irqsave(ap->lock, flags);
ecd75ad5
TH		 137
138 ata_for_each_link(link, ap, EDGE) {
139 ata_for_each_dev(dev, &ap->link, ENABLED) {
140 if (dev->horkage & ATA_HORKAGE_NOLPM) {
141 count = -EOPNOTSUPP;
142 goto out_unlock;
143 }
144 }
145 }
146
6b7ae954
TH		 147 ap->target_lpm_policy = policy;
148 ata_port_schedule_eh(ap);
ecd75ad5 149out_unlock:
6b7ae954 150 spin_unlock_irqrestore(ap->lock, flags);
ca77329f
KCA		 151 return count;
152}
153
c93b263e
TH		 154static ssize_t ata_scsi_lpm_show(struct device *dev,
155 struct device_attribute *attr, char *buf)
ca77329f 156{
ee959b00 157 struct Scsi_Host *shost = class_to_shost(dev);
ca77329f 158 struct ata_port *ap = ata_shost_to_port(shost);
ca77329f 159
6b7ae954 160 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
ca77329f
KCA		 161 return -EINVAL;
162
c93b263e 163 return snprintf(buf, PAGE_SIZE, "%s\n",
6b7ae954 164 ata_lpm_policy_names[ap->target_lpm_policy]);
ca77329f 165}
ee959b00 166DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
c93b263e 167 ata_scsi_lpm_show, ata_scsi_lpm_store);
ee959b00 168EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
ca77329f 169
45fabbb7
EO		 170static ssize_t ata_scsi_park_show(struct device *device,
171 struct device_attribute *attr, char *buf)
172{
173 struct scsi_device *sdev = to_scsi_device(device);
174 struct ata_port *ap;
175 struct ata_link *link;
176 struct ata_device *dev;
a464189d 177 unsigned long flags, now;
45fabbb7
EO		 178 unsigned int uninitialized_var(msecs);
179 int rc = 0;
180
181 ap = ata_shost_to_port(sdev->host);
182
183 spin_lock_irqsave(ap->lock, flags);
184 dev = ata_scsi_find_dev(ap, sdev);
185 if (!dev) {
186 rc = -ENODEV;
187 goto unlock;
188 }
189 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
190 rc = -EOPNOTSUPP;
191 goto unlock;
192 }
193
194 link = dev->link;
a464189d 195 now = jiffies;
45fabbb7
EO		 196 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
197 link->eh_context.unloaded_mask & (1 << dev->devno) &&
a464189d
EO		 198 time_after(dev->unpark_deadline, now))
199 msecs = jiffies_to_msecs(dev->unpark_deadline - now);
45fabbb7
EO		 200 else
201 msecs = 0;
202
203unlock:
204 spin_unlock_irq(ap->lock);
205
206 return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
207}
208
209static ssize_t ata_scsi_park_store(struct device *device,
210 struct device_attribute *attr,
211 const char *buf, size_t len)
212{
213 struct scsi_device *sdev = to_scsi_device(device);
214 struct ata_port *ap;
215 struct ata_device *dev;
216 long int input;
217 unsigned long flags;
218 int rc;
219
42b9ab7a
JH		 220 rc = kstrtol(buf, 10, &input);
221 if (rc)
222 return rc;
223 if (input < -2)
45fabbb7
EO		 224 return -EINVAL;
225 if (input > ATA_TMOUT_MAX_PARK) {
226 rc = -EOVERFLOW;
227 input = ATA_TMOUT_MAX_PARK;
228 }
229
230 ap = ata_shost_to_port(sdev->host);
231
232 spin_lock_irqsave(ap->lock, flags);
233 dev = ata_scsi_find_dev(ap, sdev);
234 if (unlikely(!dev)) {
235 rc = -ENODEV;
236 goto unlock;
237 }
9162c657
HR		 238 if (dev->class != ATA_DEV_ATA &&
239 dev->class != ATA_DEV_ZAC) {
45fabbb7
EO		 240 rc = -EOPNOTSUPP;
241 goto unlock;
242 }
243
244 if (input >= 0) {
245 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
246 rc = -EOPNOTSUPP;
247 goto unlock;
248 }
249
250 dev->unpark_deadline = ata_deadline(jiffies, input);
251 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
252 ata_port_schedule_eh(ap);
253 complete(&ap->park_req_pending);
254 } else {
255 switch (input) {
256 case -1:
257 dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
258 break;
259 case -2:
260 dev->flags |= ATA_DFLAG_NO_UNLOAD;
261 break;
262 }
263 }
264unlock:
265 spin_unlock_irqrestore(ap->lock, flags);
266
267 return rc ? rc : len;
268}
269DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
270 ata_scsi_park_show, ata_scsi_park_store);
271EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
272
74a80d67 273static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
f0761be3
TH		 274{
275 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
276
277 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
278}
279
18f7ba4c
KCA		 280static ssize_t
281ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
282 const char *buf, size_t count)
283{
284 struct Scsi_Host *shost = class_to_shost(dev);
285 struct ata_port *ap = ata_shost_to_port(shost);
286 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
287 return ap->ops->em_store(ap, buf, count);
288 return -EINVAL;
289}
290
291static ssize_t
292ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
293 char *buf)
294{
295 struct Scsi_Host *shost = class_to_shost(dev);
296 struct ata_port *ap = ata_shost_to_port(shost);
297
298 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
299 return ap->ops->em_show(ap, buf);
300 return -EINVAL;
301}
ea7a5ed5 302DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
18f7ba4c
KCA		 303 ata_scsi_em_message_show, ata_scsi_em_message_store);
304EXPORT_SYMBOL_GPL(dev_attr_em_message);
305
306static ssize_t
307ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
308 char *buf)
309{
310 struct Scsi_Host *shost = class_to_shost(dev);
311 struct ata_port *ap = ata_shost_to_port(shost);
312
313 return snprintf(buf, 23, "%d\n", ap->em_message_type);
314}
315DEVICE_ATTR(em_message_type, S_IRUGO,
316 ata_scsi_em_message_type_show, NULL);
317EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
318
319static ssize_t
320ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
321 char *buf)
322{
323 struct scsi_device *sdev = to_scsi_device(dev);
324 struct ata_port *ap = ata_shost_to_port(sdev->host);
325 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
326
26cd4d65
XF		 327 if (atadev && ap->ops->sw_activity_show &&
328 (ap->flags & ATA_FLAG_SW_ACTIVITY))
18f7ba4c
KCA		 329 return ap->ops->sw_activity_show(atadev, buf);
330 return -EINVAL;
331}
332
333static ssize_t
334ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
335 const char *buf, size_t count)
336{
337 struct scsi_device *sdev = to_scsi_device(dev);
338 struct ata_port *ap = ata_shost_to_port(sdev->host);
339 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
340 enum sw_activity val;
341 int rc;
342
26cd4d65
XF		 343 if (atadev && ap->ops->sw_activity_store &&
344 (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
18f7ba4c
KCA		 345 val = simple_strtoul(buf, NULL, 0);
346 switch (val) {
347 case OFF: case BLINK_ON: case BLINK_OFF:
348 rc = ap->ops->sw_activity_store(atadev, val);
349 if (!rc)
350 return count;
351 else
352 return rc;
353 }
354 }
355 return -EINVAL;
356}
ea7a5ed5 357DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
18f7ba4c
KCA		 358 ata_scsi_activity_store);
359EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
360
45fabbb7
EO		 361struct device_attribute *ata_common_sdev_attrs[] = {
362 &dev_attr_unload_heads,
363 NULL
364};
365EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
366
b27dcfb0 367static void ata_scsi_invalid_field(struct scsi_cmnd *cmd)
ae006510
DG		 368{
369 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
370 /* "Invalid field in cbd" */
b27dcfb0 371 cmd->scsi_done(cmd);
ae006510
DG		 372}
373
1da177e4
LT		 374/**
375 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
376 * @sdev: SCSI device for which BIOS geometry is to be determined
377 * @bdev: block device associated with @sdev
378 * @capacity: capacity of SCSI device
379 * @geom: location to which geometry will be output
380 *
381 * Generic bios head/sector/cylinder calculator
382 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
383 * mapping. Some situations may arise where the disk is not
384 * bootable if this is not used.
385 *
386 * LOCKING:
387 * Defined by the SCSI layer. We don't really care.
388 *
389 * RETURNS:
390 * Zero.
391 */
392int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
393 sector_t capacity, int geom[])
394{
395 geom[0] = 255;
396 geom[1] = 63;
397 sector_div(capacity, 255*63);
398 geom[2] = capacity;
399
400 return 0;
401}
402
d8d9129e
TH		 403/**
404 * ata_scsi_unlock_native_capacity - unlock native capacity
405 * @sdev: SCSI device to adjust device capacity for
406 *
407 * This function is called if a partition on @sdev extends beyond
408 * the end of the device. It requests EH to unlock HPA.
409 *
410 * LOCKING:
411 * Defined by the SCSI layer. Might sleep.
412 */
413void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
414{
415 struct ata_port *ap = ata_shost_to_port(sdev->host);
416 struct ata_device *dev;
417 unsigned long flags;
418
419 spin_lock_irqsave(ap->lock, flags);
420
421 dev = ata_scsi_find_dev(ap, sdev);
422 if (dev && dev->n_sectors < dev->n_native_sectors) {
423 dev->flags |= ATA_DFLAG_UNLOCK_HPA;
424 dev->link->eh_info.action |= ATA_EH_RESET;
425 ata_port_schedule_eh(ap);
426 }
427
428 spin_unlock_irqrestore(ap->lock, flags);
429 ata_port_wait_eh(ap);
430}
431
5924b74c
TH		 432/**
433 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
5eb66fe0 434 * @ap: target port
5924b74c
TH		 435 * @sdev: SCSI device to get identify data for
436 * @arg: User buffer area for identify data
437 *
438 * LOCKING:
439 * Defined by the SCSI layer. We don't really care.
440 *
441 * RETURNS:
442 * Zero on success, negative errno on error.
443 */
94be9a58
JG		 444static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
445 void __user *arg)
5924b74c 446{
5924b74c
TH		 447 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
448 u16 __user *dst = arg;
449 char buf[40];
450
451 if (!dev)
452 return -ENOMSG;
453
454 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
455 return -EFAULT;
456
457 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
458 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
459 return -EFAULT;
460
461 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
462 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
463 return -EFAULT;
464
465 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
466 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
467 return -EFAULT;
468
469 return 0;
470}
471
b095518e
JG		 472/**
473 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
8e8b77dd 474 * @scsidev: Device to which we are issuing command
b095518e
JG		 475 * @arg: User provided data for issuing command
476 *
477 * LOCKING:
478 * Defined by the SCSI layer. We don't really care.
479 *
480 * RETURNS:
481 * Zero on success, negative errno on error.
482 */
b095518e
JG		 483int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
484{
485 int rc = 0;
486 u8 scsi_cmd[MAX_COMMAND_SIZE];
bbe1fe7e 487 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
b095518e 488 int argsize = 0;
85837ebd 489 enum dma_data_direction data_dir;
bbe1fe7e 490 int cmd_result;
b095518e 491
c893a3ae 492 if (arg == NULL)
b095518e
JG		 493 return -EINVAL;
494
495 if (copy_from_user(args, arg, sizeof(args)))
496 return -EFAULT;
497
bbe1fe7e
ET		 498 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
499 if (!sensebuf)
500 return -ENOMEM;
501
b095518e
JG		 502 memset(scsi_cmd, 0, sizeof(scsi_cmd));
503
504 if (args[3]) {
295124dc 505 argsize = ATA_SECT_SIZE * args[3];
b095518e 506 argbuf = kmalloc(argsize, GFP_KERNEL);
54dac83c
JR		 507 if (argbuf == NULL) {
508 rc = -ENOMEM;
509 goto error;
510 }
b095518e
JG		 511
512 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
513 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
2dcb407e 514 block count in sector count field */
85837ebd 515 data_dir = DMA_FROM_DEVICE;
b095518e
JG		 516 } else {
517 scsi_cmd[1] = (3 << 1); /* Non-data */
bbe1fe7e 518 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
85837ebd 519 data_dir = DMA_NONE;
b095518e
JG		 520 }
521
522 scsi_cmd[0] = ATA_16;
523
524 scsi_cmd[4] = args[2];
a4f19040 525 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
b095518e
JG		 526 scsi_cmd[6] = args[3];
527 scsi_cmd[8] = args[1];
528 scsi_cmd[10] = 0x4f;
529 scsi_cmd[12] = 0xc2;
530 } else {
531 scsi_cmd[6] = args[1];
532 }
533 scsi_cmd[14] = args[0];
534
535 /* Good values for timeout and retries? Values below
536 from scsi_ioctl_send_command() for default case... */
bbe1fe7e 537 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
f4f4e47e 538 sensebuf, (10*HZ), 5, 0, NULL);
bbe1fe7e
ET		 539
540 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
541 u8 *desc = sensebuf + 8;
542 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
543
544 /* If we set cc then ATA pass-through will cause a
545 * check condition even if no error. Filter that. */
546 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
547 struct scsi_sense_hdr sshdr;
548 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
2dcb407e 549 &sshdr);
6d3bfc7b
KM		 550 if (sshdr.sense_key == RECOVERED_ERROR &&
551 sshdr.asc == 0 && sshdr.ascq == 0x1d)
bbe1fe7e
ET		 552 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
553 }
554
555 /* Send userspace a few ATA registers (same as drivers/ide) */
2dcb407e
JG		 556 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
557 desc[0] == 0x09) { /* code is "ATA Descriptor" */
558 args[0] = desc[13]; /* status */
559 args[1] = desc[3]; /* error */
560 args[2] = desc[5]; /* sector count (0:7) */
bbe1fe7e
ET		 561 if (copy_to_user(arg, args, sizeof(args)))
562 rc = -EFAULT;
563 }
564 }
565
566
567 if (cmd_result) {
b095518e
JG		 568 rc = -EIO;
569 goto error;
570 }
571
b095518e 572 if ((argbuf)
c893a3ae 573 && copy_to_user(arg + sizeof(args), argbuf, argsize))
b095518e
JG		 574 rc = -EFAULT;
575error:
bbe1fe7e 576 kfree(sensebuf);
8f760780 577 kfree(argbuf);
b095518e
JG		 578 return rc;
579}
580
581/**
582 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
8e8b77dd 583 * @scsidev: Device to which we are issuing command
b095518e
JG		 584 * @arg: User provided data for issuing command
585 *
586 * LOCKING:
587 * Defined by the SCSI layer. We don't really care.
588 *
589 * RETURNS:
590 * Zero on success, negative errno on error.
591 */
592int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
593{
594 int rc = 0;
595 u8 scsi_cmd[MAX_COMMAND_SIZE];
af068bd1
DM		 596 u8 args[7], *sensebuf = NULL;
597 int cmd_result;
b095518e 598
c893a3ae 599 if (arg == NULL)
b095518e
JG		 600 return -EINVAL;
601
602 if (copy_from_user(args, arg, sizeof(args)))
603 return -EFAULT;
604
af068bd1
DM		 605 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
606 if (!sensebuf)
607 return -ENOMEM;
608
b095518e
JG		 609 memset(scsi_cmd, 0, sizeof(scsi_cmd));
610 scsi_cmd[0] = ATA_16;
611 scsi_cmd[1] = (3 << 1); /* Non-data */
af068bd1 612 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
b095518e
JG		 613 scsi_cmd[4] = args[1];
614 scsi_cmd[6] = args[2];
615 scsi_cmd[8] = args[3];
616 scsi_cmd[10] = args[4];
617 scsi_cmd[12] = args[5];
277239f2 618 scsi_cmd[13] = args[6] & 0x4f;
b095518e
JG		 619 scsi_cmd[14] = args[0];
620
b095518e 621 /* Good values for timeout and retries? Values below
2e9edbf8 622 from scsi_ioctl_send_command() for default case... */
af068bd1 623 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
f4f4e47e 624 sensebuf, (10*HZ), 5, 0, NULL);
af068bd1
DM		 625
626 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
627 u8 *desc = sensebuf + 8;
628 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
629
630 /* If we set cc then ATA pass-through will cause a
631 * check condition even if no error. Filter that. */
632 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
633 struct scsi_sense_hdr sshdr;
634 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
635 &sshdr);
6d3bfc7b
KM		 636 if (sshdr.sense_key == RECOVERED_ERROR &&
637 sshdr.asc == 0 && sshdr.ascq == 0x1d)
af068bd1
DM		 638 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
639 }
640
641 /* Send userspace ATA registers */
642 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
643 desc[0] == 0x09) {/* code is "ATA Descriptor" */
644 args[0] = desc[13]; /* status */
645 args[1] = desc[3]; /* error */
646 args[2] = desc[5]; /* sector count (0:7) */
647 args[3] = desc[7]; /* lbal */
648 args[4] = desc[9]; /* lbam */
649 args[5] = desc[11]; /* lbah */
650 args[6] = desc[12]; /* select */
651 if (copy_to_user(arg, args, sizeof(args)))
652 rc = -EFAULT;
653 }
654 }
655
656 if (cmd_result) {
b095518e 657 rc = -EIO;
af068bd1
DM		 658 goto error;
659 }
b095518e 660
af068bd1
DM		 661 error:
662 kfree(sensebuf);
b095518e
JG		 663 return rc;
664}
665
e3cf95dd
AC		 666static int ata_ioc32(struct ata_port *ap)
667{
668 if (ap->flags & ATA_FLAG_PIO_DMA)
669 return 1;
670 if (ap->pflags & ATA_PFLAG_PIO32)
671 return 1;
672 return 0;
673}
674
94be9a58
JG		 675int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
676 int cmd, void __user *arg)
1da177e4 677{
1da177e4 678 int val = -EINVAL, rc = -EINVAL;
e3cf95dd 679 unsigned long flags;
1da177e4 680
1da177e4
LT		 681 switch (cmd) {
682 case ATA_IOC_GET_IO32:
e3cf95dd
AC		 683 spin_lock_irqsave(ap->lock, flags);
684 val = ata_ioc32(ap);
685 spin_unlock_irqrestore(ap->lock, flags);
1da177e4
LT		 686 if (copy_to_user(arg, &val, 1))
687 return -EFAULT;
688 return 0;
689
690 case ATA_IOC_SET_IO32:
691 val = (unsigned long) arg;
e3cf95dd
AC		 692 rc = 0;
693 spin_lock_irqsave(ap->lock, flags);
694 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
695 if (val)
696 ap->pflags |= ATA_PFLAG_PIO32;
697 else
698 ap->pflags &= ~ATA_PFLAG_PIO32;
699 } else {
700 if (val != ata_ioc32(ap))
701 rc = -EINVAL;
702 }
703 spin_unlock_irqrestore(ap->lock, flags);
704 return rc;
1da177e4 705
5924b74c 706 case HDIO_GET_IDENTITY:
94be9a58 707 return ata_get_identity(ap, scsidev, arg);
5924b74c 708
b095518e
JG		 709 case HDIO_DRIVE_CMD:
710 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
711 return -EACCES;
712 return ata_cmd_ioctl(scsidev, arg);
713
714 case HDIO_DRIVE_TASK:
715 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
716 return -EACCES;
717 return ata_task_ioctl(scsidev, arg);
718
1da177e4
LT		 719 default:
720 rc = -ENOTTY;
721 break;
722 }
723
1da177e4
LT		 724 return rc;
725}
94be9a58
JG		 726EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
727
728int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
729{
730 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
731 scsidev, cmd, arg);
732}
733EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
1da177e4
LT		 734
735/**
736 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
1da177e4
LT		 737 * @dev: ATA device to which the new command is attached
738 * @cmd: SCSI command that originated this ATA command
1da177e4
LT		 739 *
740 * Obtain a reference to an unused ata_queued_cmd structure,
741 * which is the basic libata structure representing a single
742 * ATA command sent to the hardware.
743 *
744 * If a command was available, fill in the SCSI-specific
745 * portions of the structure with information on the
746 * current command.
747 *
748 * LOCKING:
cca3974e 749 * spin_lock_irqsave(host lock)
1da177e4
LT		 750 *
751 * RETURNS:
752 * Command allocated, or %NULL if none available.
753 */
7102d230 754static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
b27dcfb0 755 struct scsi_cmnd *cmd)
1da177e4
LT		 756{
757 struct ata_queued_cmd *qc;
758
12cb5ce1 759 qc = ata_qc_new_init(dev, cmd->request->tag);
1da177e4
LT		 760 if (qc) {
761 qc->scsicmd = cmd;
b27dcfb0 762 qc->scsidone = cmd->scsi_done;
1da177e4 763
ff2aeb1e 764 qc->sg = scsi_sglist(cmd);
7120165c 765 qc->n_elem = scsi_sg_count(cmd);
1da177e4
LT		 766 } else {
767 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
b27dcfb0 768 cmd->scsi_done(cmd);
1da177e4
LT		 769 }
770
771 return qc;
772}
773
aacda375
TH		 774static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
775{
776 struct scsi_cmnd *scmd = qc->scsicmd;
777
778 qc->extrabytes = scmd->request->extra_len;
779 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
780}
781
b095518e
JG		 782/**
783 * ata_dump_status - user friendly display of error info
784 * @id: id of the port in question
785 * @tf: ptr to filled out taskfile
786 *
787 * Decode and dump the ATA error/status registers for the user so
788 * that they have some idea what really happened at the non
789 * make-believe layer.
790 *
791 * LOCKING:
792 * inherited from caller
793 */
7102d230 794static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
b095518e
JG		 795{
796 u8 stat = tf->command, err = tf->feature;
797
798 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
799 if (stat & ATA_BUSY) {
800 printk("Busy }\n"); /* Data is not valid in this case */
801 } else {
1308d7f0
HR		 802 if (stat & ATA_DRDY) printk("DriveReady ");
803 if (stat & ATA_DF) printk("DeviceFault ");
804 if (stat & ATA_DSC) printk("SeekComplete ");
805 if (stat & ATA_DRQ) printk("DataRequest ");
806 if (stat & ATA_CORR) printk("CorrectedError ");
807 if (stat & ATA_SENSE) printk("Sense ");
808 if (stat & ATA_ERR) printk("Error ");
b095518e
JG		 809 printk("}\n");
810
811 if (err) {
812 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
1308d7f0
HR		 813 if (err & ATA_ABORTED) printk("DriveStatusError ");
814 if (err & ATA_ICRC) {
815 if (err & ATA_ABORTED)
816 printk("BadCRC ");
b095518e
JG		 817 else printk("Sector ");
818 }
1308d7f0
HR		 819 if (err & ATA_UNC) printk("UncorrectableError ");
820 if (err & ATA_IDNF) printk("SectorIdNotFound ");
821 if (err & ATA_TRK0NF) printk("TrackZeroNotFound ");
822 if (err & ATA_AMNF) printk("AddrMarkNotFound ");
b095518e
JG		 823 printk("}\n");
824 }
825 }
826}
827
1da177e4
LT		 828/**
829 * ata_to_sense_error - convert ATA error to SCSI error
8e8b77dd 830 * @id: ATA device number
1da177e4 831 * @drv_stat: value contained in ATA status register
b095518e
JG		 832 * @drv_err: value contained in ATA error register
833 * @sk: the sense key we'll fill out
834 * @asc: the additional sense code we'll fill out
835 * @ascq: the additional sense code qualifier we'll fill out
246619da 836 * @verbose: be verbose
1da177e4 837 *
b095518e
JG		 838 * Converts an ATA error into a SCSI error. Fill out pointers to
839 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
840 * format sense blocks.
1da177e4
LT		 841 *
842 * LOCKING:
cca3974e 843 * spin_lock_irqsave(host lock)
1da177e4 844 */
7102d230
AB		 845static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
846 u8 *asc, u8 *ascq, int verbose)
1da177e4 847{
b095518e 848 int i;
ffe75ef6 849
1da177e4 850 /* Based on the 3ware driver translation table */
98ac62de 851 static const unsigned char sense_table[][4] = {
1da177e4 852 /* BBD|ECC|ID|MAR */
8ae72044
HR		 853 {0xd1, ABORTED_COMMAND, 0x00, 0x00},
854 // Device busy Aborted command
1da177e4 855 /* BBD|ECC|ID */
8ae72044
HR		 856 {0xd0, ABORTED_COMMAND, 0x00, 0x00},
857 // Device busy Aborted command
1da177e4 858 /* ECC|MC|MARK */
8ae72044
HR		 859 {0x61, HARDWARE_ERROR, 0x00, 0x00},
860 // Device fault Hardware error
1da177e4 861 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
8ae72044
HR		 862 {0x84, ABORTED_COMMAND, 0x47, 0x00},
863 // Data CRC error SCSI parity error
1da177e4 864 /* MC|ID|ABRT|TRK0|MARK */
8ae72044
HR		 865 {0x37, NOT_READY, 0x04, 0x00},
866 // Unit offline Not ready
1da177e4 867 /* MCR|MARK */
8ae72044
HR		 868 {0x09, NOT_READY, 0x04, 0x00},
869 // Unrecovered disk error Not ready
1da177e4 870 /* Bad address mark */
8ae72044
HR		 871 {0x01, MEDIUM_ERROR, 0x13, 0x00},
872 // Address mark not found for data field
873 /* TRK0 - Track 0 not found */
874 {0x02, HARDWARE_ERROR, 0x00, 0x00},
875 // Hardware error
78062c50 876 /* Abort: 0x04 is not translated here, see below */
1da177e4 877 /* Media change request */
8ae72044
HR		 878 {0x08, NOT_READY, 0x04, 0x00},
879 // FIXME: faking offline
880 /* SRV/IDNF - ID not found */
881 {0x10, ILLEGAL_REQUEST, 0x21, 0x00},
882 // Logical address out of range
883 /* MC - Media Changed */
884 {0x20, UNIT_ATTENTION, 0x28, 0x00},
885 // Not ready to ready change, medium may have changed
886 /* ECC - Uncorrectable ECC error */
887 {0x40, MEDIUM_ERROR, 0x11, 0x04},
888 // Unrecovered read error
1da177e4 889 /* BBD - block marked bad */
8ae72044
HR		 890 {0x80, MEDIUM_ERROR, 0x11, 0x04},
891 // Block marked bad Medium error, unrecovered read error
1da177e4
LT		 892 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
893 };
98ac62de 894 static const unsigned char stat_table[][4] = {
1da177e4 895 /* Must be first because BUSY means no other bits valid */
8ae72044
HR		 896 {0x80, ABORTED_COMMAND, 0x47, 0x00},
897 // Busy, fake parity for now
898 {0x40, ILLEGAL_REQUEST, 0x21, 0x04},
899 // Device ready, unaligned write command
900 {0x20, HARDWARE_ERROR, 0x44, 0x00},
901 // Device fault, internal target failure
902 {0x08, ABORTED_COMMAND, 0x47, 0x00},
903 // Timed out in xfer, fake parity for now
904 {0x04, RECOVERED_ERROR, 0x11, 0x00},
905 // Recovered ECC error Medium error, recovered
1da177e4
LT		 906 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
907 };
1da177e4 908
1da177e4
LT		 909 /*
910 * Is this an error we can process/parse
911 */
b095518e
JG		 912 if (drv_stat & ATA_BUSY) {
913 drv_err = 0; /* Ignore the err bits, they're invalid */
1da177e4 914 }
b095518e
JG		 915
916 if (drv_err) {
917 /* Look for drv_err */
918 for (i = 0; sense_table[i][0] != 0xFF; i++) {
919 /* Look for best matches first */
2e9edbf8 920 if ((sense_table[i][0] & drv_err) ==
b095518e
JG		 921 sense_table[i][0]) {
922 *sk = sense_table[i][1];
923 *asc = sense_table[i][2];
924 *ascq = sense_table[i][3];
925 goto translate_done;
926 }
927 }
1da177e4 928 }
b095518e 929
78062c50
GG		 930 /*
931 * Fall back to interpreting status bits. Note that if the drv_err
932 * has only the ABRT bit set, we decode drv_stat. ABRT by itself
933 * is not descriptive enough.
934 */
b095518e
JG		 935 for (i = 0; stat_table[i][0] != 0xFF; i++) {
936 if (stat_table[i][0] & drv_stat) {
937 *sk = stat_table[i][1];
938 *asc = stat_table[i][2];
939 *ascq = stat_table[i][3];
940 goto translate_done;
1da177e4 941 }
b095518e 942 }
b095518e 943
78062c50
GG		 944 /*
945 * We need a sensible error return here, which is tricky, and one
946 * that won't cause people to do things like return a disk wrongly.
947 */
2d202024
AC		 948 *sk = ABORTED_COMMAND;
949 *asc = 0x00;
950 *ascq = 0x00;
b095518e
JG		 951
952 translate_done:
246619da
TH		 953 if (verbose)
954 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
955 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
956 id, drv_stat, drv_err, *sk, *asc, *ascq);
b095518e
JG		 957 return;
958}
959
960/*
750426aa 961 * ata_gen_passthru_sense - Generate check condition sense block.
b095518e
JG		 962 * @qc: Command that completed.
963 *
964 * This function is specific to the ATA descriptor format sense
965 * block specified for the ATA pass through commands. Regardless
966 * of whether the command errored or not, return a sense
967 * block. Copy all controller registers into the sense
84a9a8cd
GG		 968 * block. If there was no error, we get the request from an ATA
969 * passthrough command, so we use the following sense data:
970 * sk = RECOVERED ERROR
971 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
972 *
b095518e
JG		 973 *
974 * LOCKING:
750426aa 975 * None.
b095518e 976 */
750426aa 977static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
b095518e
JG		 978{
979 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 980 struct ata_taskfile *tf = &qc->result_tf;
b095518e
JG		 981 unsigned char *sb = cmd->sense_buffer;
982 unsigned char *desc = sb + 8;
246619da 983 int verbose = qc->ap->ops->error_handler == NULL;
b095518e
JG		 984
985 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
986
0e5dec47 987 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 988
b095518e
JG		 989 /*
990 * Use ata_to_sense_error() to map status register bits
991 * onto sense key, asc & ascq.
992 */
058e55e1
TH		 993 if (qc->err_mask ||
994 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
44877b4e 995 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
246619da 996 &sb[1], &sb[2], &sb[3], verbose);
b095518e 997 sb[1] &= 0x0f;
84a9a8cd
GG		 998 } else {
999 sb[1] = RECOVERED_ERROR;
1000 sb[2] = 0;
1001 sb[3] = 0x1D;
1da177e4
LT		 1002 }
1003
b095518e
JG		 1004 /*
1005 * Sense data is current and format is descriptor.
1006 */
1007 sb[0] = 0x72;
1da177e4 1008
b095518e
JG		 1009 desc[0] = 0x09;
1010
f38621b3
TH		 1011 /* set length of additional sense data */
1012 sb[7] = 14;
1013 desc[1] = 12;
b095518e
JG		 1014
1015 /*
1016 * Copy registers into sense buffer.
1017 */
1018 desc[2] = 0x00;
1019 desc[3] = tf->feature; /* == error reg */
1020 desc[5] = tf->nsect;
1021 desc[7] = tf->lbal;
1022 desc[9] = tf->lbam;
1023 desc[11] = tf->lbah;
1024 desc[12] = tf->device;
1025 desc[13] = tf->command; /* == status reg */
1026
1027 /*
1028 * Fill in Extend bit, and the high order bytes
1029 * if applicable.
1030 */
1031 if (tf->flags & ATA_TFLAG_LBA48) {
1032 desc[2] |= 0x01;
1033 desc[4] = tf->hob_nsect;
1034 desc[6] = tf->hob_lbal;
1035 desc[8] = tf->hob_lbam;
1036 desc[10] = tf->hob_lbah;
1da177e4 1037 }
b095518e 1038}
1da177e4 1039
b095518e 1040/**
750426aa 1041 * ata_gen_ata_sense - generate a SCSI fixed sense block
b095518e
JG		 1042 * @qc: Command that we are erroring out
1043 *
d25614ba 1044 * Generate sense block for a failed ATA command @qc. Descriptor
25985edc 1045 * format is used to accommodate LBA48 block address.
b095518e
JG		 1046 *
1047 * LOCKING:
750426aa 1048 * None.
b095518e 1049 */
750426aa 1050static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
b095518e 1051{
d25614ba 1052 struct ata_device *dev = qc->dev;
b095518e 1053 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 1054 struct ata_taskfile *tf = &qc->result_tf;
b095518e 1055 unsigned char *sb = cmd->sense_buffer;
d25614ba 1056 unsigned char *desc = sb + 8;
246619da 1057 int verbose = qc->ap->ops->error_handler == NULL;
d25614ba 1058 u64 block;
b095518e
JG		 1059
1060 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1061
0e5dec47 1062 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 1063
d25614ba
TH		 1064 /* sense data is current and format is descriptor */
1065 sb[0] = 0x72;
1066
1067 /* Use ata_to_sense_error() to map status register bits
b095518e
JG		 1068 * onto sense key, asc & ascq.
1069 */
058e55e1
TH		 1070 if (qc->err_mask ||
1071 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
44877b4e 1072 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
d25614ba
TH		 1073 &sb[1], &sb[2], &sb[3], verbose);
1074 sb[1] &= 0x0f;
1da177e4 1075 }
1da177e4 1076
d25614ba 1077 block = ata_tf_read_block(&qc->result_tf, dev);
a7dac447 1078
d25614ba
TH		 1079 /* information sense data descriptor */
1080 sb[7] = 12;
1081 desc[0] = 0x00;
1082 desc[1] = 10;
a7dac447 1083
d25614ba
TH		 1084 desc[2] |= 0x80; /* valid */
1085 desc[6] = block >> 40;
1086 desc[7] = block >> 32;
1087 desc[8] = block >> 24;
1088 desc[9] = block >> 16;
1089 desc[10] = block >> 8;
1090 desc[11] = block;
1da177e4
LT		 1091}
1092
a6cce2a7
BK		 1093static void ata_scsi_sdev_config(struct scsi_device *sdev)
1094{
1095 sdev->use_10_for_rw = 1;
1096 sdev->use_10_for_ms = 1;
3c6bdaea 1097 sdev->no_report_opcodes = 1;
5db44863 1098 sdev->no_write_same = 1;
31cc23b3
TH		 1099
1100 /* Schedule policy is determined by ->qc_defer() callback and
1101 * it needs to see every deferred qc. Set dev_blocked to 1 to
1102 * prevent SCSI midlayer from automatically deferring
1103 * requests.
1104 */
1105 sdev->max_device_blocked = 1;
a6cce2a7
BK		 1106}
1107
fa2fc7f4
JB		 1108/**
1109 * atapi_drain_needed - Check whether data transfer may overflow
73fd8b6d 1110 * @rq: request to be checked
fa2fc7f4
JB		 1111 *
1112 * ATAPI commands which transfer variable length data to host
1113 * might overflow due to application error or hardare bug. This
1114 * function checks whether overflow should be drained and ignored
1115 * for @request.
1116 *
1117 * LOCKING:
1118 * None.
1119 *
1120 * RETURNS:
1121 * 1 if ; otherwise, 0.
1122 */
1123static int atapi_drain_needed(struct request *rq)
1124{
33659ebb 1125 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
fa2fc7f4
JB		 1126 return 0;
1127
7b6d91da 1128 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
fa2fc7f4
JB		 1129 return 0;
1130
1131 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1132}
1133
1134static int ata_scsi_dev_config(struct scsi_device *sdev,
1135 struct ata_device *dev)
a6cce2a7 1136{
900e599e 1137 struct request_queue *q = sdev->request_queue;
1138
45fabbb7
EO		 1139 if (!ata_id_has_unload(dev->id))
1140 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1141
914ed354 1142 /* configure max sectors */
900e599e 1143 blk_queue_max_hw_sectors(q, dev->max_sectors);
a6cce2a7 1144
fa2fc7f4 1145 if (dev->class == ATA_DEV_ATAPI) {
fa2fc7f4
JB		 1146 void *buf;
1147
729a6a30
TH		 1148 sdev->sector_size = ATA_SECT_SIZE;
1149
1150 /* set DMA padding */
900e599e 1151 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
fa2fc7f4
JB		 1152
1153 /* configure draining */
1154 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1155 if (!buf) {
a9a79dfe 1156 ata_dev_err(dev, "drain buffer allocation failed\n");
fa2fc7f4
JB		 1157 return -ENOMEM;
1158 }
1159
1160 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1161 } else {
295124dc 1162 sdev->sector_size = ata_id_logical_sector_size(dev->id);
d8cf5389 1163 sdev->manage_start_stop = 1;
dde20207 1164 }
d8cf5389 1165
729a6a30
TH		 1166 /*
1167 * ata_pio_sectors() expects buffer for each sector to not cross
1168 * page boundary. Enforce it by requiring buffers to be sector
1169 * aligned, which works iff sector_size is not larger than
1170 * PAGE_SIZE. ATAPI devices also need the alignment as
1171 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1172 */
1173 if (sdev->sector_size > PAGE_SIZE)
a9a79dfe 1174 ata_dev_warn(dev,
729a6a30
TH		 1175 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1176 sdev->sector_size);
1177
900e599e 1178 blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
729a6a30 1179
f26792d5
JG		 1180 if (dev->flags & ATA_DFLAG_AN)
1181 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1182
a6e6ce8e
TH		 1183 if (dev->flags & ATA_DFLAG_NCQ) {
1184 int depth;
1185
1186 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1187 depth = min(ATA_MAX_QUEUE - 1, depth);
db5ed4df 1188 scsi_change_queue_depth(sdev, depth);
a6e6ce8e 1189 }
fa2fc7f4 1190
900e599e 1191 blk_queue_flush_queueable(q, false);
1192
295124dc 1193 dev->sdev = sdev;
fa2fc7f4 1194 return 0;
a6cce2a7
BK		 1195}
1196
1da177e4
LT		 1197/**
1198 * ata_scsi_slave_config - Set SCSI device attributes
1199 * @sdev: SCSI device to examine
1200 *
1201 * This is called before we actually start reading
1202 * and writing to the device, to configure certain
1203 * SCSI mid-layer behaviors.
1204 *
1205 * LOCKING:
1206 * Defined by SCSI layer. We don't really care.
1207 */
1208
1209int ata_scsi_slave_config(struct scsi_device *sdev)
1210{
31534363
TH		 1211 struct ata_port *ap = ata_shost_to_port(sdev->host);
1212 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
fa2fc7f4 1213 int rc = 0;
31534363 1214
a6cce2a7 1215 ata_scsi_sdev_config(sdev);
1da177e4 1216
31534363 1217 if (dev)
fa2fc7f4 1218 rc = ata_scsi_dev_config(sdev, dev);
1da177e4 1219
fa2fc7f4 1220 return rc;
1da177e4
LT		 1221}
1222
83c47bcb
TH		 1223/**
1224 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1225 * @sdev: SCSI device to be destroyed
1226 *
1227 * @sdev is about to be destroyed for hot/warm unplugging. If
1228 * this unplugging was initiated by libata as indicated by NULL
1229 * dev->sdev, this function doesn't have to do anything.
1230 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1231 * Clear dev->sdev, schedule the device for ATA detach and invoke
1232 * EH.
1233 *
1234 * LOCKING:
1235 * Defined by SCSI layer. We don't really care.
1236 */
1237void ata_scsi_slave_destroy(struct scsi_device *sdev)
1238{
1239 struct ata_port *ap = ata_shost_to_port(sdev->host);
fa2fc7f4 1240 struct request_queue *q = sdev->request_queue;
83c47bcb
TH		 1241 unsigned long flags;
1242 struct ata_device *dev;
1243
1244 if (!ap->ops->error_handler)
1245 return;
1246
ba6a1308 1247 spin_lock_irqsave(ap->lock, flags);
83c47bcb
TH		 1248 dev = __ata_scsi_find_dev(ap, sdev);
1249 if (dev && dev->sdev) {
1250 /* SCSI device already in CANCEL state, no need to offline it */
1251 dev->sdev = NULL;
1252 dev->flags |= ATA_DFLAG_DETACH;
1253 ata_port_schedule_eh(ap);
1254 }
ba6a1308 1255 spin_unlock_irqrestore(ap->lock, flags);
fa2fc7f4
JB		 1256
1257 kfree(q->dma_drain_buffer);
1258 q->dma_drain_buffer = NULL;
1259 q->dma_drain_size = 0;
83c47bcb
TH		 1260}
1261
a6e6ce8e 1262/**
f6e67035 1263 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
6d2dd054
MPS		 1264 * @ap: ATA port to which the device change the queue depth
1265 * @sdev: SCSI device to configure queue depth for
1266 * @queue_depth: new queue depth
a6e6ce8e 1267 *
f6e67035
DW		 1268 * libsas and libata have different approaches for associating a sdev to
1269 * its ata_port.
a6e6ce8e 1270 *
a6e6ce8e 1271 */
f6e67035 1272int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
db5ed4df 1273 int queue_depth)
a6e6ce8e 1274{
a6e6ce8e 1275 struct ata_device *dev;
360f654e 1276 unsigned long flags;
a6e6ce8e 1277
c3c70c44 1278 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
a6e6ce8e
TH		 1279 return sdev->queue_depth;
1280
1281 dev = ata_scsi_find_dev(ap, sdev);
1282 if (!dev || !ata_dev_enabled(dev))
1283 return sdev->queue_depth;
1284
c3c70c44 1285 /* NCQ enabled? */
360f654e 1286 spin_lock_irqsave(ap->lock, flags);
c3c70c44
TH		 1287 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1288 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
360f654e 1289 dev->flags |= ATA_DFLAG_NCQ_OFF;
c3c70c44
TH		 1290 queue_depth = 1;
1291 }
360f654e
TH		 1292 spin_unlock_irqrestore(ap->lock, flags);
1293
c3c70c44
TH		 1294 /* limit and apply queue depth */
1295 queue_depth = min(queue_depth, sdev->host->can_queue);
1296 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1297 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1298
1299 if (sdev->queue_depth == queue_depth)
1300 return -EINVAL;
1301
db5ed4df 1302 return scsi_change_queue_depth(sdev, queue_depth);
a6e6ce8e
TH		 1303}
1304
f6e67035
DW		 1305/**
1306 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1307 * @sdev: SCSI device to configure queue depth for
1308 * @queue_depth: new queue depth
f6e67035
DW		 1309 *
1310 * This is libata standard hostt->change_queue_depth callback.
1311 * SCSI will call into this callback when user tries to set queue
1312 * depth via sysfs.
1313 *
1314 * LOCKING:
1315 * SCSI layer (we don't care)
1316 *
1317 * RETURNS:
1318 * Newly configured queue depth.
1319 */
db5ed4df 1320int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
f6e67035
DW		 1321{
1322 struct ata_port *ap = ata_shost_to_port(sdev->host);
1323
db5ed4df 1324 return __ata_change_queue_depth(ap, sdev, queue_depth);
f6e67035
DW		 1325}
1326
972dcafb
DG		 1327/**
1328 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1329 * @qc: Storage for translated ATA taskfile
972dcafb
DG		 1330 *
1331 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1332 * (to start). Perhaps these commands should be preceded by
1333 * CHECK POWER MODE to see what power mode the device is already in.
1334 * [See SAT revision 5 at www.t10.org]
1335 *
1336 * LOCKING:
cca3974e 1337 * spin_lock_irqsave(host lock)
972dcafb
DG		 1338 *
1339 * RETURNS:
1340 * Zero on success, non-zero on error.
1341 */
ad706991 1342static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
972dcafb 1343{
542b1444 1344 struct scsi_cmnd *scmd = qc->scsicmd;
972dcafb 1345 struct ata_taskfile *tf = &qc->tf;
ad706991 1346 const u8 *cdb = scmd->cmnd;
972dcafb 1347
2e5704f6
TH		 1348 if (scmd->cmd_len < 5)
1349 goto invalid_fld;
1350
972dcafb
DG		 1351 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1352 tf->protocol = ATA_PROT_NODATA;
542b1444 1353 if (cdb[1] & 0x1) {
972dcafb
DG		 1354 ; /* ignore IMMED bit, violates sat-r05 */
1355 }
542b1444 1356 if (cdb[4] & 0x2)
ae006510 1357 goto invalid_fld; /* LOEJ bit set not supported */
542b1444 1358 if (((cdb[4] >> 4) & 0xf) != 0)
ae006510 1359 goto invalid_fld; /* power conditions not supported */
e31e8531 1360
542b1444 1361 if (cdb[4] & 0x1) {
972dcafb 1362 tf->nsect = 1; /* 1 sector, lba=0 */
9d5b1302
AL		 1363
1364 if (qc->dev->flags & ATA_DFLAG_LBA) {
c44078c0 1365 tf->flags |= ATA_TFLAG_LBA;
9d5b1302
AL		 1366
1367 tf->lbah = 0x0;
1368 tf->lbam = 0x0;
1369 tf->lbal = 0x0;
1370 tf->device |= ATA_LBA;
1371 } else {
1372 /* CHS */
1373 tf->lbal = 0x1; /* sect */
1374 tf->lbam = 0x0; /* cyl low */
1375 tf->lbah = 0x0; /* cyl high */
1376 }
1377
972dcafb 1378 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
920a4b10 1379 } else {
2a6e58d2
RW		 1380 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1381 * or S5) causing some drives to spin up and down again.
1382 */
1383 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1384 system_state == SYSTEM_POWER_OFF)
1385 goto skip;
1386
1387 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1388 system_entering_hibernation())
1389 goto skip;
1390
78981a7c
RH		 1391 /* Issue ATA STANDBY IMMEDIATE command */
1392 tf->command = ATA_CMD_STANDBYNOW1;
920a4b10 1393 }
78981a7c 1394
972dcafb
DG		 1395 /*
1396 * Standby and Idle condition timers could be implemented but that
1397 * would require libata to implement the Power condition mode page
1398 * and allow the user to change it. Changing mode pages requires
1399 * MODE SELECT to be implemented.
1400 */
1401
1402 return 0;
ae006510 1403
2a6e58d2 1404 invalid_fld:
542b1444 1405 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1406 /* "Invalid field in cbd" */
1407 return 1;
2a6e58d2
RW		 1408 skip:
1409 scmd->result = SAM_STAT_GOOD;
1410 return 1;
972dcafb
DG		 1411}
1412
1413
1da177e4
LT		 1414/**
1415 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1416 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1417 *
1418 * Sets up an ATA taskfile to issue FLUSH CACHE or
1419 * FLUSH CACHE EXT.
1420 *
1421 * LOCKING:
cca3974e 1422 * spin_lock_irqsave(host lock)
1da177e4
LT		 1423 *
1424 * RETURNS:
1425 * Zero on success, non-zero on error.
1426 */
ad706991 1427static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1da177e4
LT		 1428{
1429 struct ata_taskfile *tf = &qc->tf;
1430
1431 tf->flags |= ATA_TFLAG_DEVICE;
1432 tf->protocol = ATA_PROT_NODATA;
1433
6fc49adb 1434 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1da177e4
LT		 1435 tf->command = ATA_CMD_FLUSH_EXT;
1436 else
1437 tf->command = ATA_CMD_FLUSH;
1438
b666da35
TH		 1439 /* flush is critical for IO integrity, consider it an IO command */
1440 qc->flags |= ATA_QCFLAG_IO;
1441
1da177e4
LT		 1442 return 0;
1443}
1444
3aef5231
AL		 1445/**
1446 * scsi_6_lba_len - Get LBA and transfer length
542b1444 1447 * @cdb: SCSI command to translate
3aef5231
AL		 1448 *
1449 * Calculate LBA and transfer length for 6-byte commands.
1450 *
1451 * RETURNS:
1452 * @plba: the LBA
1453 * @plen: the transfer length
1454 */
542b1444 1455static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1456{
1457 u64 lba = 0;
6c7b7d2b 1458 u32 len;
3aef5231
AL		 1459
1460 VPRINTK("six-byte command\n");
1461
6c7b7d2b 1462 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
542b1444
TH		 1463 lba |= ((u64)cdb[2]) << 8;
1464 lba |= ((u64)cdb[3]);
3aef5231 1465
6c7b7d2b 1466 len = cdb[4];
3aef5231
AL		 1467
1468 *plba = lba;
1469 *plen = len;
1470}
1471
1472/**
1473 * scsi_10_lba_len - Get LBA and transfer length
542b1444 1474 * @cdb: SCSI command to translate
3aef5231
AL		 1475 *
1476 * Calculate LBA and transfer length for 10-byte commands.
1477 *
1478 * RETURNS:
1479 * @plba: the LBA
1480 * @plen: the transfer length
1481 */
542b1444 1482static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1483{
1484 u64 lba = 0;
1485 u32 len = 0;
1486
1487 VPRINTK("ten-byte command\n");
1488
542b1444
TH		 1489 lba |= ((u64)cdb[2]) << 24;
1490 lba |= ((u64)cdb[3]) << 16;
1491 lba |= ((u64)cdb[4]) << 8;
1492 lba |= ((u64)cdb[5]);
3aef5231 1493
542b1444
TH		 1494 len |= ((u32)cdb[7]) << 8;
1495 len |= ((u32)cdb[8]);
3aef5231
AL		 1496
1497 *plba = lba;
1498 *plen = len;
1499}
1500
1501/**
1502 * scsi_16_lba_len - Get LBA and transfer length
542b1444 1503 * @cdb: SCSI command to translate
3aef5231
AL		 1504 *
1505 * Calculate LBA and transfer length for 16-byte commands.
1506 *
1507 * RETURNS:
1508 * @plba: the LBA
1509 * @plen: the transfer length
1510 */
542b1444 1511static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1512{
1513 u64 lba = 0;
1514 u32 len = 0;
1515
1516 VPRINTK("sixteen-byte command\n");
1517
542b1444
TH		 1518 lba |= ((u64)cdb[2]) << 56;
1519 lba |= ((u64)cdb[3]) << 48;
1520 lba |= ((u64)cdb[4]) << 40;
1521 lba |= ((u64)cdb[5]) << 32;
1522 lba |= ((u64)cdb[6]) << 24;
1523 lba |= ((u64)cdb[7]) << 16;
1524 lba |= ((u64)cdb[8]) << 8;
1525 lba |= ((u64)cdb[9]);
3aef5231 1526
542b1444
TH		 1527 len |= ((u32)cdb[10]) << 24;
1528 len |= ((u32)cdb[11]) << 16;
1529 len |= ((u32)cdb[12]) << 8;
1530 len |= ((u32)cdb[13]);
3aef5231
AL		 1531
1532 *plba = lba;
1533 *plen = len;
1534}
1535
1da177e4
LT		 1536/**
1537 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1538 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1539 *
1540 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1541 *
1542 * LOCKING:
cca3974e 1543 * spin_lock_irqsave(host lock)
1da177e4
LT		 1544 *
1545 * RETURNS:
1546 * Zero on success, non-zero on error.
1547 */
ad706991 1548static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1da177e4 1549{
542b1444 1550 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4 1551 struct ata_taskfile *tf = &qc->tf;
8bf62ece 1552 struct ata_device *dev = qc->dev;
1da177e4 1553 u64 dev_sectors = qc->dev->n_sectors;
ad706991 1554 const u8 *cdb = scmd->cmnd;
3aef5231
AL		 1555 u64 block;
1556 u32 n_block;
1da177e4
LT		 1557
1558 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1559 tf->protocol = ATA_PROT_NODATA;
1da177e4 1560
2e5704f6
TH		 1561 if (cdb[0] == VERIFY) {
1562 if (scmd->cmd_len < 10)
1563 goto invalid_fld;
542b1444 1564 scsi_10_lba_len(cdb, &block, &n_block);
2e5704f6
TH		 1565 } else if (cdb[0] == VERIFY_16) {
1566 if (scmd->cmd_len < 16)
1567 goto invalid_fld;
542b1444 1568 scsi_16_lba_len(cdb, &block, &n_block);
2e5704f6 1569 } else
ae006510 1570 goto invalid_fld;
1da177e4 1571
8bf62ece 1572 if (!n_block)
ae006510 1573 goto nothing_to_do;
8bf62ece 1574 if (block >= dev_sectors)
ae006510 1575 goto out_of_range;
8bf62ece 1576 if ((block + n_block) > dev_sectors)
ae006510 1577 goto out_of_range;
1da177e4 1578
07506697
AL		 1579 if (dev->flags & ATA_DFLAG_LBA) {
1580 tf->flags |= ATA_TFLAG_LBA;
1581
c6a33e24
AL		 1582 if (lba_28_ok(block, n_block)) {
1583 /* use LBA28 */
1584 tf->command = ATA_CMD_VERIFY;
1585 tf->device |= (block >> 24) & 0xf;
1586 } else if (lba_48_ok(block, n_block)) {
1587 if (!(dev->flags & ATA_DFLAG_LBA48))
1588 goto out_of_range;
07506697
AL		 1589
1590 /* use LBA48 */
1591 tf->flags |= ATA_TFLAG_LBA48;
8bf62ece 1592 tf->command = ATA_CMD_VERIFY_EXT;
1da177e4 1593
8bf62ece 1594 tf->hob_nsect = (n_block >> 8) & 0xff;
1da177e4 1595
8bf62ece
AL		 1596 tf->hob_lbah = (block >> 40) & 0xff;
1597 tf->hob_lbam = (block >> 32) & 0xff;
1598 tf->hob_lbal = (block >> 24) & 0xff;
c6a33e24
AL		 1599 } else
1600 /* request too large even for LBA48 */
1601 goto out_of_range;
8bf62ece
AL		 1602
1603 tf->nsect = n_block & 0xff;
1da177e4 1604
8bf62ece
AL		 1605 tf->lbah = (block >> 16) & 0xff;
1606 tf->lbam = (block >> 8) & 0xff;
1607 tf->lbal = block & 0xff;
1da177e4 1608
8bf62ece
AL		 1609 tf->device |= ATA_LBA;
1610 } else {
1611 /* CHS */
1612 u32 sect, head, cyl, track;
1613
c6a33e24
AL		 1614 if (!lba_28_ok(block, n_block))
1615 goto out_of_range;
07506697 1616
8bf62ece
AL		 1617 /* Convert LBA to CHS */
1618 track = (u32)block / dev->sectors;
1619 cyl = track / dev->heads;
1620 head = track % dev->heads;
1621 sect = (u32)block % dev->sectors + 1;
1622
c187c4b5
AL		 1623 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1624 (u32)block, track, cyl, head, sect);
2e9edbf8
JG		 1625
1626 /* Check whether the converted CHS can fit.
1627 Cylinder: 0-65535
8bf62ece
AL		 1628 Head: 0-15
1629 Sector: 1-255*/
2e9edbf8 1630 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
ae006510 1631 goto out_of_range;
2e9edbf8 1632
8bf62ece
AL		 1633 tf->command = ATA_CMD_VERIFY;
1634 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1635 tf->lbal = sect;
1636 tf->lbam = cyl;
1637 tf->lbah = cyl >> 8;
1638 tf->device |= head;
1639 }
1da177e4
LT		 1640
1641 return 0;
ae006510
DG		 1642
1643invalid_fld:
542b1444 1644 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1645 /* "Invalid field in cbd" */
1646 return 1;
1647
1648out_of_range:
542b1444 1649 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1650 /* "Logical Block Address out of range" */
1651 return 1;
1652
1653nothing_to_do:
542b1444 1654 scmd->result = SAM_STAT_GOOD;
ae006510 1655 return 1;
1da177e4
LT		 1656}
1657
1658/**
1659 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1660 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1661 *
1662 * Converts any of six SCSI read/write commands into the
1663 * ATA counterpart, including starting sector (LBA),
1664 * sector count, and taking into account the device's LBA48
1665 * support.
1666 *
1667 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1668 * %WRITE_16 are currently supported.
1669 *
1670 * LOCKING:
cca3974e 1671 * spin_lock_irqsave(host lock)
1da177e4
LT		 1672 *
1673 * RETURNS:
1674 * Zero on success, non-zero on error.
1675 */
ad706991 1676static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1da177e4 1677{
542b1444 1678 struct scsi_cmnd *scmd = qc->scsicmd;
ad706991 1679 const u8 *cdb = scmd->cmnd;
bd056d7e 1680 unsigned int tf_flags = 0;
3aef5231
AL		 1681 u64 block;
1682 u32 n_block;
bd056d7e 1683 int rc;
1da177e4 1684
542b1444 1685 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
bd056d7e 1686 tf_flags |= ATA_TFLAG_WRITE;
1da177e4 1687
9a3dccc4 1688 /* Calculate the SCSI LBA, transfer length and FUA. */
542b1444 1689 switch (cdb[0]) {
3aef5231
AL		 1690 case READ_10:
1691 case WRITE_10:
2e5704f6
TH		 1692 if (unlikely(scmd->cmd_len < 10))
1693 goto invalid_fld;
542b1444 1694 scsi_10_lba_len(cdb, &block, &n_block);
3e451a49 1695 if (cdb[1] & (1 << 3))
bd056d7e 1696 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1697 break;
1698 case READ_6:
1699 case WRITE_6:
2e5704f6
TH		 1700 if (unlikely(scmd->cmd_len < 6))
1701 goto invalid_fld;
542b1444 1702 scsi_6_lba_len(cdb, &block, &n_block);
c187c4b5
AL		 1703
1704 /* for 6-byte r/w commands, transfer length 0
1705 * means 256 blocks of data, not 0 block.
1706 */
76b2bf9b
JG		 1707 if (!n_block)
1708 n_block = 256;
3aef5231
AL		 1709 break;
1710 case READ_16:
1711 case WRITE_16:
2e5704f6
TH		 1712 if (unlikely(scmd->cmd_len < 16))
1713 goto invalid_fld;
542b1444 1714 scsi_16_lba_len(cdb, &block, &n_block);
3e451a49 1715 if (cdb[1] & (1 << 3))
bd056d7e 1716 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1717 break;
1718 default:
8bf62ece 1719 DPRINTK("no-byte command\n");
ae006510 1720 goto invalid_fld;
1da177e4
LT		 1721 }
1722
8bf62ece
AL		 1723 /* Check and compose ATA command */
1724 if (!n_block)
c187c4b5
AL		 1725 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1726 * length 0 means transfer 0 block of data.
1727 * However, for ATA R/W commands, sector count 0 means
1728 * 256 or 65536 sectors, not 0 sectors as in SCSI.
f51750d5
AC		 1729 *
1730 * WARNING: one or two older ATA drives treat 0 as 0...
c187c4b5 1731 */
ae006510 1732 goto nothing_to_do;
1da177e4 1733
bd056d7e 1734 qc->flags |= ATA_QCFLAG_IO;
295124dc 1735 qc->nbytes = n_block * scmd->device->sector_size;
1da177e4 1736
bd056d7e
TH		 1737 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1738 qc->tag);
1739 if (likely(rc == 0))
1740 return 0;
ae006510 1741
bd056d7e
TH		 1742 if (rc == -ERANGE)
1743 goto out_of_range;
1744 /* treat all other errors as -EINVAL, fall through */
ae006510 1745invalid_fld:
542b1444 1746 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1747 /* "Invalid field in cbd" */
1748 return 1;
1749
1750out_of_range:
542b1444 1751 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1752 /* "Logical Block Address out of range" */
1753 return 1;
1754
1755nothing_to_do:
542b1444 1756 scmd->result = SAM_STAT_GOOD;
ae006510 1757 return 1;
1da177e4
LT		 1758}
1759
2aa8f5d6
CH		 1760static void ata_qc_done(struct ata_queued_cmd *qc)
1761{
1762 struct scsi_cmnd *cmd = qc->scsicmd;
1763 void (*done)(struct scsi_cmnd *) = qc->scsidone;
1764
1765 ata_qc_free(qc);
1766 done(cmd);
1767}
1768
77853bf2 1769static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1da177e4 1770{
c31f571d 1771 struct ata_port *ap = qc->ap;
1da177e4 1772 struct scsi_cmnd *cmd = qc->scsicmd;
a7dac447 1773 u8 *cdb = cmd->cmnd;
2dcb407e 1774 int need_sense = (qc->err_mask != 0);
b095518e
JG		 1775
1776 /* For ATA pass thru (SAT) commands, generate a sense block if
1777 * user mandated it or if there's an error. Note that if we
84a9a8cd
GG		 1778 * generate because the user forced us to [CK_COND =1], a check
1779 * condition is generated and the ATA register values are returned
b095518e 1780 * whether the command completed successfully or not. If there
84a9a8cd
GG		 1781 * was no error, we use the following sense data:
1782 * sk = RECOVERED ERROR
1783 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
b095518e 1784 */
a7dac447 1785 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
25c7ce7f 1786 ((cdb[2] & 0x20) || need_sense))
750426aa 1787 ata_gen_passthru_sense(qc);
25c7ce7f
CH		 1788 else if (need_sense)
1789 ata_gen_ata_sense(qc);
1790 else
1791 cmd->result = SAM_STAT_GOOD;
1da177e4 1792
c31f571d 1793 if (need_sense && !ap->ops->error_handler)
44877b4e 1794 ata_dump_status(ap->print_id, &qc->result_tf);
1da177e4 1795
2aa8f5d6 1796 ata_qc_done(qc);
1da177e4
LT		 1797}
1798
1799/**
1800 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1da177e4
LT		 1801 * @dev: ATA device to which the command is addressed
1802 * @cmd: SCSI command to execute
1da177e4
LT		 1803 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1804 *
1805 * Our ->queuecommand() function has decided that the SCSI
1806 * command issued can be directly translated into an ATA
1807 * command, rather than handled internally.
1808 *
1809 * This function sets up an ata_queued_cmd structure for the
1810 * SCSI command, and sends that ata_queued_cmd to the hardware.
1811 *
ae006510
DG		 1812 * The xlat_func argument (actor) returns 0 if ready to execute
1813 * ATA command, else 1 to finish translation. If 1 is returned
1814 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1815 * to be set reflecting an error condition or clean (early)
1816 * termination.
1817 *
1da177e4 1818 * LOCKING:
cca3974e 1819 * spin_lock_irqsave(host lock)
2115ea94
TH		 1820 *
1821 * RETURNS:
1822 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1823 * needs to be deferred.
1da177e4 1824 */
2115ea94 1825static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
2115ea94 1826 ata_xlat_func_t xlat_func)
1da177e4 1827{
31cc23b3 1828 struct ata_port *ap = dev->link->ap;
1da177e4 1829 struct ata_queued_cmd *qc;
31cc23b3 1830 int rc;
1da177e4
LT		 1831
1832 VPRINTK("ENTER\n");
1833
b27dcfb0 1834 qc = ata_scsi_qc_new(dev, cmd);
1da177e4 1835 if (!qc)
ae006510 1836 goto err_mem;
1da177e4
LT		 1837
1838 /* data is present; dma-map it */
be7db055 1839 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1840 cmd->sc_data_direction == DMA_TO_DEVICE) {
7120165c 1841 if (unlikely(scsi_bufflen(cmd) < 1)) {
a9a79dfe 1842 ata_dev_warn(dev, "WARNING: zero len r/w req\n");
ae006510 1843 goto err_did;
1da177e4
LT		 1844 }
1845
7120165c 1846 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1da177e4
LT		 1847
1848 qc->dma_dir = cmd->sc_data_direction;
1849 }
1850
1851 qc->complete_fn = ata_scsi_qc_complete;
1852
ad706991 1853 if (xlat_func(qc))
ae006510 1854 goto early_finish;
1da177e4 1855
31cc23b3
TH		 1856 if (ap->ops->qc_defer) {
1857 if ((rc = ap->ops->qc_defer(qc)))
1858 goto defer;
1859 }
1860
1da177e4 1861 /* select device, send command to hardware */
8e0e694a 1862 ata_qc_issue(qc);
1da177e4
LT		 1863
1864 VPRINTK("EXIT\n");
2115ea94 1865 return 0;
1da177e4 1866
ae006510 1867early_finish:
2dcb407e 1868 ata_qc_free(qc);
b27dcfb0 1869 cmd->scsi_done(cmd);
ae006510 1870 DPRINTK("EXIT - early finish (good or error)\n");
2115ea94 1871 return 0;
ae006510
DG		 1872
1873err_did:
1da177e4 1874 ata_qc_free(qc);
ae006510 1875 cmd->result = (DID_ERROR << 16);
b27dcfb0 1876 cmd->scsi_done(cmd);
253b92ec 1877err_mem:
ae006510 1878 DPRINTK("EXIT - internal\n");
2115ea94 1879 return 0;
3dc1d881
TH		 1880
1881defer:
31cc23b3 1882 ata_qc_free(qc);
3dc1d881 1883 DPRINTK("EXIT - defer\n");
31cc23b3
TH		 1884 if (rc == ATA_DEFER_LINK)
1885 return SCSI_MLQUEUE_DEVICE_BUSY;
1886 else
1887 return SCSI_MLQUEUE_HOST_BUSY;
1da177e4
LT		 1888}
1889
1890/**
1891 * ata_scsi_rbuf_get - Map response buffer.
ec2a20e6 1892 * @cmd: SCSI command containing buffer to be mapped.
87340e98
TH		 1893 * @flags: unsigned long variable to store irq enable status
1894 * @copy_in: copy in from user buffer
1da177e4 1895 *
87340e98 1896 * Prepare buffer for simulated SCSI commands.
1da177e4
LT		 1897 *
1898 * LOCKING:
87340e98 1899 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1da177e4
LT		 1900 *
1901 * RETURNS:
87340e98 1902 * Pointer to response buffer.
1da177e4 1903 */
87340e98
TH		 1904static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1905 unsigned long *flags)
1da177e4 1906{
87340e98 1907 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1da177e4 1908
87340e98
TH		 1909 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1910 if (copy_in)
1911 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1912 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1913 return ata_scsi_rbuf;
1da177e4
LT		 1914}
1915
1916/**
1917 * ata_scsi_rbuf_put - Unmap response buffer.
1918 * @cmd: SCSI command containing buffer to be unmapped.
87340e98
TH		 1919 * @copy_out: copy out result
1920 * @flags: @flags passed to ata_scsi_rbuf_get()
1da177e4 1921 *
87340e98
TH		 1922 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1923 * @copy_back is true.
1da177e4
LT		 1924 *
1925 * LOCKING:
87340e98 1926 * Unlocks ata_scsi_rbuf_lock.
1da177e4 1927 */
87340e98
TH		 1928static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1929 unsigned long *flags)
1da177e4 1930{
87340e98
TH		 1931 if (copy_out)
1932 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1933 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1934 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1da177e4
LT		 1935}
1936
1937/**
1938 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1939 * @args: device IDENTIFY data / SCSI command of interest.
1940 * @actor: Callback hook for desired SCSI command simulator
1941 *
1942 * Takes care of the hard work of simulating a SCSI command...
1943 * Mapping the response buffer, calling the command's handler,
1944 * and handling the handler's return value. This return value
1945 * indicates whether the handler wishes the SCSI command to be
ae006510
DG		 1946 * completed successfully (0), or not (in which case cmd->result
1947 * and sense buffer are assumed to be set).
1da177e4
LT		 1948 *
1949 * LOCKING:
cca3974e 1950 * spin_lock_irqsave(host lock)
1da177e4 1951 */
f0761be3 1952static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
87340e98 1953 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1da177e4
LT		 1954{
1955 u8 *rbuf;
87340e98 1956 unsigned int rc;
1da177e4 1957 struct scsi_cmnd *cmd = args->cmd;
b445c568
JG		 1958 unsigned long flags;
1959
87340e98
TH		 1960 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1961 rc = actor(args, rbuf);
1962 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
b445c568 1963
ae006510 1964 if (rc == 0)
1da177e4 1965 cmd->result = SAM_STAT_GOOD;
ae006510 1966 args->done(cmd);
1da177e4
LT		 1967}
1968
1969/**
1970 * ata_scsiop_inq_std - Simulate INQUIRY command
1971 * @args: device IDENTIFY data / SCSI command of interest.
1972 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 1973 *
1974 * Returns standard device identification data associated
b142eb65 1975 * with non-VPD INQUIRY command output.
1da177e4
LT		 1976 *
1977 * LOCKING:
cca3974e 1978 * spin_lock_irqsave(host lock)
1da177e4 1979 */
87340e98 1980static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 1981{
87340e98 1982 const u8 versions[] = {
f9ca5ab8 1983 0x00,
87340e98
TH		 1984 0x60, /* SAM-3 (no version claimed) */
1985
1986 0x03,
1987 0x20, /* SBC-2 (no version claimed) */
1988
1989 0x02,
1990 0x60 /* SPC-3 (no version claimed) */
1991 };
f9ca5ab8
HR		 1992 const u8 versions_zbc[] = {
1993 0x00,
1994 0xA0, /* SAM-5 (no version claimed) */
1995
1996 0x04,
1997 0xC0, /* SBC-3 (no version claimed) */
1998
1999 0x04,
2000 0x60, /* SPC-4 (no version claimed) */
2001
2002 0x60,
2003 0x20, /* ZBC (no version claimed) */
2004 };
2005
1da177e4
LT		 2006 u8 hdr[] = {
2007 TYPE_DISK,
2008 0,
2009 0x5, /* claim SPC-3 version compatibility */
2010 2,
2011 95 - 4
2012 };
2013
87340e98
TH		 2014 VPRINTK("ENTER\n");
2015
8a3e33cf
ML		 2016 /* set scsi removable (RMB) bit per ata bit, or if the
2017 * AHCI port says it's external (Hotplug-capable, eSATA).
2018 */
2019 if (ata_id_removable(args->id) ||
2020 (args->dev->link->ap->pflags & ATA_PFLAG_EXTERNAL))
1da177e4
LT		 2021 hdr[1] |= (1 << 7);
2022
f9ca5ab8
HR		 2023 if (args->dev->class == ATA_DEV_ZAC) {
2024 hdr[0] = TYPE_ZBC;
2025 hdr[2] = 0x6; /* ZBC is defined in SPC-4 */
2026 }
2027
1da177e4 2028 memcpy(rbuf, hdr, sizeof(hdr));
87340e98
TH		 2029 memcpy(&rbuf[8], "ATA ", 8);
2030 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
c49a6bf5
KB		 2031
2032 /* From SAT, use last 2 words from fw rev unless they are spaces */
2033 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4);
2034 if (strncmp(&rbuf[32], " ", 4) == 0)
2035 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1da177e4 2036
87340e98
TH		 2037 if (rbuf[32] == 0 || rbuf[32] == ' ')
2038 memcpy(&rbuf[32], "n/a ", 4);
1da177e4 2039
f9ca5ab8
HR		 2040 if (args->dev->class == ATA_DEV_ZAC)
2041 memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc));
2042 else
2043 memcpy(rbuf + 58, versions, sizeof(versions));
1da177e4
LT		 2044
2045 return 0;
2046}
2047
2048/**
b142eb65 2049 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1da177e4
LT		 2050 * @args: device IDENTIFY data / SCSI command of interest.
2051 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2052 *
b142eb65 2053 * Returns list of inquiry VPD pages available.
1da177e4
LT		 2054 *
2055 * LOCKING:
cca3974e 2056 * spin_lock_irqsave(host lock)
1da177e4 2057 */
87340e98 2058static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2059{
2060 const u8 pages[] = {
2061 0x00, /* page 0x00, this page */
2062 0x80, /* page 0x80, unit serial no page */
1e9dbc92
MW		 2063 0x83, /* page 0x83, device ident page */
2064 0x89, /* page 0x89, ata info page */
18f0f978 2065 0xb0, /* page 0xb0, block limits page */
1e9dbc92 2066 0xb1, /* page 0xb1, block device characteristics page */
02e0a604 2067 0xb2, /* page 0xb2, thin provisioning page */
1da177e4 2068 };
1da177e4 2069
87340e98
TH		 2070 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
2071 memcpy(rbuf + 4, pages, sizeof(pages));
1da177e4
LT		 2072 return 0;
2073}
2074
2075/**
b142eb65 2076 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1da177e4
LT		 2077 * @args: device IDENTIFY data / SCSI command of interest.
2078 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2079 *
2080 * Returns ATA device serial number.
2081 *
2082 * LOCKING:
cca3974e 2083 * spin_lock_irqsave(host lock)
1da177e4 2084 */
87340e98 2085static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2086{
2087 const u8 hdr[] = {
2088 0,
2089 0x80, /* this page code */
2090 0,
a0cf733b 2091 ATA_ID_SERNO_LEN, /* page len */
1da177e4 2092 };
1da177e4 2093
87340e98
TH		 2094 memcpy(rbuf, hdr, sizeof(hdr));
2095 ata_id_string(args->id, (unsigned char *) &rbuf[4],
2096 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1da177e4
LT		 2097 return 0;
2098}
2099
1da177e4 2100/**
b142eb65 2101 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1da177e4
LT		 2102 * @args: device IDENTIFY data / SCSI command of interest.
2103 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2104 *
b142eb65
JG		 2105 * Yields two logical unit device identification designators:
2106 * - vendor specific ASCII containing the ATA serial number
2107 * - SAT defined "t10 vendor id based" containing ASCII vendor
2108 * name ("ATA "), model and serial numbers.
1da177e4
LT		 2109 *
2110 * LOCKING:
cca3974e 2111 * spin_lock_irqsave(host lock)
1da177e4 2112 */
87340e98 2113static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2114{
b142eb65 2115 const int sat_model_serial_desc_len = 68;
87340e98 2116 int num;
1da177e4 2117
b142eb65
JG		 2118 rbuf[1] = 0x83; /* this page code */
2119 num = 4;
2120
87340e98
TH		 2121 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2122 rbuf[num + 0] = 2;
2123 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2124 num += 4;
2125 ata_id_string(args->id, (unsigned char *) rbuf + num,
2126 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2127 num += ATA_ID_SERNO_LEN;
2128
2129 /* SAT defined lu model and serial numbers descriptor */
2130 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2131 rbuf[num + 0] = 2;
2132 rbuf[num + 1] = 1;
2133 rbuf[num + 3] = sat_model_serial_desc_len;
2134 num += 4;
2135 memcpy(rbuf + num, "ATA ", 8);
2136 num += 8;
2137 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2138 ATA_ID_PROD_LEN);
2139 num += ATA_ID_PROD_LEN;
2140 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2141 ATA_ID_SERNO_LEN);
2142 num += ATA_ID_SERNO_LEN;
2143
6b3b9d73
HR		 2144 if (ata_id_has_wwn(args->id)) {
2145 /* SAT defined lu world wide name */
2146 /* piv=0, assoc=lu, code_set=binary, designator=NAA */
2147 rbuf[num + 0] = 1;
2148 rbuf[num + 1] = 3;
2149 rbuf[num + 3] = ATA_ID_WWN_LEN;
2150 num += 4;
2151 ata_id_string(args->id, (unsigned char *) rbuf + num,
2152 ATA_ID_WWN, ATA_ID_WWN_LEN);
2153 num += ATA_ID_WWN_LEN;
2154 }
b142eb65 2155 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
1da177e4
LT		 2156 return 0;
2157}
2158
ad355b46
JG		 2159/**
2160 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2161 * @args: device IDENTIFY data / SCSI command of interest.
2162 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
ad355b46
JG		 2163 *
2164 * Yields SAT-specified ATA VPD page.
2165 *
2166 * LOCKING:
2167 * spin_lock_irqsave(host lock)
2168 */
87340e98 2169static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
ad355b46 2170{
ad355b46 2171 struct ata_taskfile tf;
ad355b46 2172
ad355b46
JG		 2173 memset(&tf, 0, sizeof(tf));
2174
87340e98
TH		 2175 rbuf[1] = 0x89; /* our page code */
2176 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2177 rbuf[3] = (0x238 & 0xff);
ad355b46 2178
87340e98
TH		 2179 memcpy(&rbuf[8], "linux ", 8);
2180 memcpy(&rbuf[16], "libata ", 16);
2181 memcpy(&rbuf[32], DRV_VERSION, 4);
ad355b46
JG		 2182
2183 /* we don't store the ATA device signature, so we fake it */
2184
2185 tf.command = ATA_DRDY; /* really, this is Status reg */
2186 tf.lbal = 0x1;
2187 tf.nsect = 0x1;
2188
87340e98
TH		 2189 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2190 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
ad355b46 2191
87340e98 2192 rbuf[56] = ATA_CMD_ID_ATA;
ad355b46 2193
87340e98 2194 memcpy(&rbuf[60], &args->id[0], 512);
ad355b46
JG		 2195 return 0;
2196}
2197
18f0f978
CH		 2198static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
2199{
295124dc 2200 u16 min_io_sectors;
18f0f978
CH		 2201
2202 rbuf[1] = 0xb0;
2203 rbuf[3] = 0x3c; /* required VPD size with unmap support */
2204
2205 /*
2206 * Optimal transfer length granularity.
2207 *
2208 * This is always one physical block, but for disks with a smaller
2209 * logical than physical sector size we need to figure out what the
2210 * latter is.
2211 */
295124dc 2212 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
18f0f978
CH		 2213 put_unaligned_be16(min_io_sectors, &rbuf[6]);
2214
2215 /*
2216 * Optimal unmap granularity.
2217 *
2218 * The ATA spec doesn't even know about a granularity or alignment
2219 * for the TRIM command. We can leave away most of the unmap related
2220 * VPD page entries, but we have specifify a granularity to signal
2221 * that we support some form of unmap - in thise case via WRITE SAME
2222 * with the unmap bit set.
2223 */
e78db4df 2224 if (ata_id_has_trim(args->id)) {
5f4e2066 2225 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
18f0f978 2226 put_unaligned_be32(1, &rbuf[28]);
e78db4df 2227 }
18f0f978
CH		 2228
2229 return 0;
2230}
2231
1e9dbc92
MW		 2232static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2233{
4bca3286
MP		 2234 int form_factor = ata_id_form_factor(args->id);
2235 int media_rotation_rate = ata_id_rotation_rate(args->id);
2236
1e9dbc92
MW		 2237 rbuf[1] = 0xb1;
2238 rbuf[3] = 0x3c;
4bca3286
MP		 2239 rbuf[4] = media_rotation_rate >> 8;
2240 rbuf[5] = media_rotation_rate;
2241 rbuf[7] = form_factor;
1e9dbc92
MW		 2242
2243 return 0;
2244}
2245
02e0a604
MP		 2246static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
2247{
2248 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2249 rbuf[1] = 0xb2;
2250 rbuf[3] = 0x4;
2251 rbuf[5] = 1 << 6; /* TPWS */
2252
2253 return 0;
2254}
2255
1da177e4 2256/**
0cba632b 2257 * ata_scsiop_noop - Command handler that simply returns success.
1da177e4
LT		 2258 * @args: device IDENTIFY data / SCSI command of interest.
2259 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2260 *
2261 * No operation. Simply returns success to caller, to indicate
2262 * that the caller should successfully complete this SCSI command.
2263 *
2264 * LOCKING:
cca3974e 2265 * spin_lock_irqsave(host lock)
1da177e4 2266 */
87340e98 2267static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2268{
2269 VPRINTK("ENTER\n");
2270 return 0;
2271}
2272
6ca8e794
PB		 2273/**
2274 * modecpy - Prepare response for MODE SENSE
2275 * @dest: output buffer
2276 * @src: data being copied
2277 * @n: length of mode page
2278 * @changeable: whether changeable parameters are requested
2279 *
2280 * Generate a generic MODE SENSE page for either current or changeable
2281 * parameters.
2282 *
2283 * LOCKING:
2284 * None.
2285 */
2286static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
2287{
2288 if (changeable) {
2289 memcpy(dest, src, 2);
2290 memset(dest + 2, 0, n - 2);
2291 } else {
2292 memcpy(dest, src, n);
2293 }
2294}
2295
1da177e4
LT		 2296/**
2297 * ata_msense_caching - Simulate MODE SENSE caching info page
2298 * @id: device IDENTIFY data
87340e98 2299 * @buf: output buffer
6ca8e794 2300 * @changeable: whether changeable parameters are requested
1da177e4
LT		 2301 *
2302 * Generate a caching info page, which conditionally indicates
2303 * write caching to the SCSI layer, depending on device
2304 * capabilities.
2305 *
2306 * LOCKING:
2307 * None.
2308 */
6ca8e794 2309static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
1da177e4 2310{
6ca8e794 2311 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
1b26d29c 2312 if (changeable || ata_id_wcache_enabled(id))
87340e98 2313 buf[2] |= (1 << 2); /* write cache enable */
6ca8e794 2314 if (!changeable && !ata_id_rahead_enabled(id))
87340e98
TH		 2315 buf[12] |= (1 << 5); /* disable read ahead */
2316 return sizeof(def_cache_mpage);
1da177e4
LT		 2317}
2318
2319/**
2320 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
87340e98 2321 * @buf: output buffer
6ca8e794 2322 * @changeable: whether changeable parameters are requested
1da177e4
LT		 2323 *
2324 * Generate a generic MODE SENSE control mode page.
2325 *
2326 * LOCKING:
2327 * None.
2328 */
6ca8e794 2329static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable)
1da177e4 2330{
6ca8e794 2331 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable);
00ac37f5 2332 return sizeof(def_control_mpage);
1da177e4
LT		 2333}
2334
2335/**
2336 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
ec2a20e6 2337 * @buf: output buffer
6ca8e794 2338 * @changeable: whether changeable parameters are requested
1da177e4
LT		 2339 *
2340 * Generate a generic MODE SENSE r/w error recovery page.
2341 *
2342 * LOCKING:
2343 * None.
2344 */
6ca8e794 2345static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable)
1da177e4 2346{
6ca8e794
PB		 2347 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage),
2348 changeable);
00ac37f5 2349 return sizeof(def_rw_recovery_mpage);
1da177e4
LT		 2350}
2351
48bdc8ec
JA		 2352/*
2353 * We can turn this into a real blacklist if it's needed, for now just
2354 * blacklist any Maxtor BANC1G10 revision firmware
2355 */
2356static int ata_dev_supports_fua(u16 *id)
2357{
a0cf733b 2358 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
48bdc8ec 2359
c3c013a2
JG		 2360 if (!libata_fua)
2361 return 0;
48bdc8ec
JA		 2362 if (!ata_id_has_fua(id))
2363 return 0;
2364
a0cf733b
TH		 2365 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2366 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
48bdc8ec 2367
2e02671d 2368 if (strcmp(model, "Maxtor"))
48bdc8ec 2369 return 1;
2e02671d 2370 if (strcmp(fw, "BANC1G10"))
48bdc8ec
JA		 2371 return 1;
2372
2373 return 0; /* blacklisted */
2374}
2375
1da177e4
LT		 2376/**
2377 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2378 * @args: device IDENTIFY data / SCSI command of interest.
2379 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2380 *
00ac37f5
DG		 2381 * Simulate MODE SENSE commands. Assume this is invoked for direct
2382 * access devices (e.g. disks) only. There should be no block
2383 * descriptor for other device types.
1da177e4
LT		 2384 *
2385 * LOCKING:
cca3974e 2386 * spin_lock_irqsave(host lock)
1da177e4 2387 */
87340e98 2388static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2389{
9a3dccc4 2390 struct ata_device *dev = args->dev;
87340e98 2391 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
00ac37f5
DG		 2392 const u8 sat_blk_desc[] = {
2393 0, 0, 0, 0, /* number of blocks: sat unspecified */
2394 0,
2395 0, 0x2, 0x0 /* block length: 512 bytes */
2396 };
2397 u8 pg, spg;
87340e98 2398 unsigned int ebd, page_control, six_byte;
9a3dccc4 2399 u8 dpofua;
1da177e4
LT		 2400
2401 VPRINTK("ENTER\n");
2402
2403 six_byte = (scsicmd[0] == MODE_SENSE);
00ac37f5
DG		 2404 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2405 /*
2406 * LLBA bit in msense(10) ignored (compliant)
1da177e4 2407 */
00ac37f5 2408
1da177e4 2409 page_control = scsicmd[2] >> 6;
ae006510
DG		 2410 switch (page_control) {
2411 case 0: /* current */
6ca8e794
PB		 2412 case 1: /* changeable */
2413 case 2: /* defaults */
ae006510
DG		 2414 break; /* supported */
2415 case 3: /* saved */
2416 goto saving_not_supp;
ae006510
DG		 2417 default:
2418 goto invalid_fld;
2419 }
1da177e4 2420
87340e98
TH		 2421 if (six_byte)
2422 p += 4 + (ebd ? 8 : 0);
2423 else
2424 p += 8 + (ebd ? 8 : 0);
1da177e4 2425
00ac37f5
DG		 2426 pg = scsicmd[2] & 0x3f;
2427 spg = scsicmd[3];
2428 /*
2429 * No mode subpages supported (yet) but asking for _all_
2430 * subpages may be valid
2431 */
2432 if (spg && (spg != ALL_SUB_MPAGES))
2433 goto invalid_fld;
2434
2435 switch(pg) {
2436 case RW_RECOVERY_MPAGE:
6ca8e794 2437 p += ata_msense_rw_recovery(p, page_control == 1);
1da177e4
LT		 2438 break;
2439
00ac37f5 2440 case CACHE_MPAGE:
6ca8e794 2441 p += ata_msense_caching(args->id, p, page_control == 1);
1da177e4
LT		 2442 break;
2443
87340e98 2444 case CONTROL_MPAGE:
6ca8e794 2445 p += ata_msense_ctl_mode(p, page_control == 1);
1da177e4 2446 break;
1da177e4 2447
00ac37f5 2448 case ALL_MPAGES:
6ca8e794
PB		 2449 p += ata_msense_rw_recovery(p, page_control == 1);
2450 p += ata_msense_caching(args->id, p, page_control == 1);
2451 p += ata_msense_ctl_mode(p, page_control == 1);
1da177e4
LT		 2452 break;
2453
2454 default: /* invalid page code */
ae006510 2455 goto invalid_fld;
1da177e4
LT		 2456 }
2457
9a3dccc4 2458 dpofua = 0;
f79d409f 2459 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
9a3dccc4
TH		 2460 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2461 dpofua = 1 << 4;
2462
1da177e4 2463 if (six_byte) {
87340e98
TH		 2464 rbuf[0] = p - rbuf - 1;
2465 rbuf[2] |= dpofua;
00ac37f5 2466 if (ebd) {
87340e98
TH		 2467 rbuf[3] = sizeof(sat_blk_desc);
2468 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
00ac37f5 2469 }
1da177e4 2470 } else {
87340e98
TH		 2471 unsigned int output_len = p - rbuf - 2;
2472
1da177e4 2473 rbuf[0] = output_len >> 8;
87340e98
TH		 2474 rbuf[1] = output_len;
2475 rbuf[3] |= dpofua;
00ac37f5 2476 if (ebd) {
87340e98
TH		 2477 rbuf[7] = sizeof(sat_blk_desc);
2478 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
00ac37f5 2479 }
1da177e4 2480 }
1da177e4 2481 return 0;
ae006510
DG		 2482
2483invalid_fld:
2484 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2485 /* "Invalid field in cbd" */
2486 return 1;
2487
2488saving_not_supp:
2489 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2490 /* "Saving parameters not supported" */
2491 return 1;
1da177e4
LT		 2492}
2493
2494/**
2495 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2496 * @args: device IDENTIFY data / SCSI command of interest.
2497 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2498 *
2499 * Simulate READ CAPACITY commands.
2500 *
2501 * LOCKING:
6a36261e 2502 * None.
1da177e4 2503 */
87340e98 2504static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2505{
61d79a8e
MP		 2506 struct ata_device *dev = args->dev;
2507 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
295124dc
GG		 2508 u32 sector_size; /* physical sector size in bytes */
2509 u8 log2_per_phys;
2510 u16 lowest_aligned;
2511
2512 sector_size = ata_id_logical_sector_size(dev->id);
2513 log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2514 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
1da177e4
LT		 2515
2516 VPRINTK("ENTER\n");
2517
1da177e4 2518 if (args->cmd->cmnd[0] == READ_CAPACITY) {
6a36261e
TH		 2519 if (last_lba >= 0xffffffffULL)
2520 last_lba = 0xffffffff;
0c144d0d 2521
1da177e4 2522 /* sector count, 32-bit */
87340e98
TH		 2523 rbuf[0] = last_lba >> (8 * 3);
2524 rbuf[1] = last_lba >> (8 * 2);
2525 rbuf[2] = last_lba >> (8 * 1);
2526 rbuf[3] = last_lba;
1da177e4
LT		 2527
2528 /* sector size */
295124dc
GG		 2529 rbuf[4] = sector_size >> (8 * 3);
2530 rbuf[5] = sector_size >> (8 * 2);
2531 rbuf[6] = sector_size >> (8 * 1);
2532 rbuf[7] = sector_size;
1da177e4
LT		 2533 } else {
2534 /* sector count, 64-bit */
87340e98
TH		 2535 rbuf[0] = last_lba >> (8 * 7);
2536 rbuf[1] = last_lba >> (8 * 6);
2537 rbuf[2] = last_lba >> (8 * 5);
2538 rbuf[3] = last_lba >> (8 * 4);
2539 rbuf[4] = last_lba >> (8 * 3);
2540 rbuf[5] = last_lba >> (8 * 2);
2541 rbuf[6] = last_lba >> (8 * 1);
2542 rbuf[7] = last_lba;
1da177e4
LT		 2543
2544 /* sector size */
295124dc
GG		 2545 rbuf[ 8] = sector_size >> (8 * 3);
2546 rbuf[ 9] = sector_size >> (8 * 2);
2547 rbuf[10] = sector_size >> (8 * 1);
2548 rbuf[11] = sector_size;
61d79a8e
MP		 2549
2550 rbuf[12] = 0;
295124dc 2551 rbuf[13] = log2_per_phys;
61d79a8e
MP		 2552 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2553 rbuf[15] = lowest_aligned;
18f0f978 2554
71d126fd
AF		 2555 if (ata_id_has_trim(args->id) &&
2556 !(dev->horkage & ATA_HORKAGE_NOTRIM)) {
e61f7d1c 2557 rbuf[14] |= 0x80; /* LBPME */
e78db4df 2558
e61f7d1c
MP		 2559 if (ata_id_has_zero_after_trim(args->id) &&
2560 dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) {
2561 ata_dev_info(dev, "Enabling discard_zeroes_data\n");
2562 rbuf[14] |= 0x40; /* LBPRZ */
2563 }
e78db4df 2564 }
1da177e4 2565 }
1da177e4
LT		 2566 return 0;
2567}
2568
2569/**
2570 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2571 * @args: device IDENTIFY data / SCSI command of interest.
2572 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2573 *
2574 * Simulate REPORT LUNS command.
2575 *
2576 * LOCKING:
cca3974e 2577 * spin_lock_irqsave(host lock)
1da177e4 2578 */
87340e98 2579static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2580{
2581 VPRINTK("ENTER\n");
2582 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2583
2584 return 0;
2585}
2586
77853bf2 2587static void atapi_sense_complete(struct ata_queued_cmd *qc)
a939c963 2588{
74e6c8c3 2589 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
c6e6e666
JG		 2590 /* FIXME: not quite right; we don't want the
2591 * translation of taskfile registers into
2592 * a sense descriptors, since that's only
2593 * correct for ATA, not ATAPI
2594 */
750426aa 2595 ata_gen_passthru_sense(qc);
74e6c8c3 2596 }
a939c963 2597
2aa8f5d6 2598 ata_qc_done(qc);
c6e6e666 2599}
a939c963 2600
c6e6e666
JG		 2601/* is it pointless to prefer PIO for "safety reasons"? */
2602static inline int ata_pio_use_silly(struct ata_port *ap)
2603{
2604 return (ap->flags & ATA_FLAG_PIO_DMA);
2605}
2606
2607static void atapi_request_sense(struct ata_queued_cmd *qc)
2608{
2609 struct ata_port *ap = qc->ap;
2610 struct scsi_cmnd *cmd = qc->scsicmd;
2611
2612 DPRINTK("ATAPI request sense\n");
a939c963 2613
7ccd720d 2614 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
a939c963 2615
127102ae 2616#ifdef CONFIG_ATA_SFF
855d854a
JB		 2617 if (ap->ops->sff_tf_read)
2618 ap->ops->sff_tf_read(ap, &qc->tf);
127102ae 2619#endif
c6e6e666
JG		 2620
2621 /* fill these in, for the case where they are -not- overwritten */
2622 cmd->sense_buffer[0] = 0x70;
2623 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2624
2625 ata_qc_reinit(qc);
2626
93f8fecb 2627 /* setup sg table and init transfer direction */
cadb7345 2628 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
93f8fecb 2629 ata_sg_init(qc, &qc->sgent, 1);
a939c963
JG		 2630 qc->dma_dir = DMA_FROM_DEVICE;
2631
6e7846e9 2632 memset(&qc->cdb, 0, qc->dev->cdb_len);
a939c963
JG		 2633 qc->cdb[0] = REQUEST_SENSE;
2634 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2635
2636 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2637 qc->tf.command = ATA_CMD_PACKET;
2638
c6e6e666 2639 if (ata_pio_use_silly(ap)) {
0dc36888 2640 qc->tf.protocol = ATAPI_PROT_DMA;
c6e6e666
JG		 2641 qc->tf.feature |= ATAPI_PKT_DMA;
2642 } else {
0dc36888 2643 qc->tf.protocol = ATAPI_PROT_PIO;
2db78dd3
AC		 2644 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2645 qc->tf.lbah = 0;
c6e6e666 2646 }
a939c963
JG		 2647 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2648
c6e6e666 2649 qc->complete_fn = atapi_sense_complete;
a939c963 2650
8e0e694a 2651 ata_qc_issue(qc);
a939c963
JG		 2652
2653 DPRINTK("EXIT\n");
2654}
2655
77853bf2 2656static void atapi_qc_complete(struct ata_queued_cmd *qc)
1da177e4
LT		 2657{
2658 struct scsi_cmnd *cmd = qc->scsicmd;
a22e2eb0 2659 unsigned int err_mask = qc->err_mask;
1da177e4 2660
a7dac447 2661 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
e12669e7 2662
246619da
TH		 2663 /* handle completion from new EH */
2664 if (unlikely(qc->ap->ops->error_handler &&
2665 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2666
2667 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2668 /* FIXME: not quite right; we don't want the
2669 * translation of taskfile registers into a
2670 * sense descriptors, since that's only
2671 * correct for ATA, not ATAPI
2672 */
750426aa 2673 ata_gen_passthru_sense(qc);
246619da
TH		 2674 }
2675
22aac089
TH		 2676 /* SCSI EH automatically locks door if sdev->locked is
2677 * set. Sometimes door lock request continues to
2678 * fail, for example, when no media is present. This
2679 * creates a loop - SCSI EH issues door lock which
2680 * fails and gets invoked again to acquire sense data
2681 * for the failed command.
2682 *
2683 * If door lock fails, always clear sdev->locked to
2684 * avoid this infinite loop.
2a5f07b5
TH		 2685 *
2686 * This may happen before SCSI scan is complete. Make
2687 * sure qc->dev->sdev isn't NULL before dereferencing.
22aac089 2688 */
2a5f07b5 2689 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
22aac089
TH		 2690 qc->dev->sdev->locked = 0;
2691
246619da 2692 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2aa8f5d6 2693 ata_qc_done(qc);
246619da
TH		 2694 return;
2695 }
2696
2697 /* successful completion or old EH failure path */
a7dac447 2698 if (unlikely(err_mask & AC_ERR_DEV)) {
1da177e4 2699 cmd->result = SAM_STAT_CHECK_CONDITION;
c6e6e666 2700 atapi_request_sense(qc);
77853bf2 2701 return;
74e6c8c3 2702 } else if (unlikely(err_mask)) {
a7dac447
JG		 2703 /* FIXME: not quite right; we don't want the
2704 * translation of taskfile registers into
2705 * a sense descriptors, since that's only
2706 * correct for ATA, not ATAPI
2707 */
750426aa 2708 ata_gen_passthru_sense(qc);
74e6c8c3 2709 } else {
1da177e4
LT		 2710 u8 *scsicmd = cmd->cmnd;
2711
fd71da46 2712 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
b445c568 2713 unsigned long flags;
87340e98 2714 u8 *buf;
b445c568 2715
87340e98 2716 buf = ata_scsi_rbuf_get(cmd, true, &flags);
a15dbeb4
JG		 2717
2718 /* ATAPI devices typically report zero for their SCSI version,
2719 * and sometimes deviate from the spec WRT response data
2720 * format. If SCSI version is reported as zero like normal,
2721 * then we make the following fixups: 1) Fake MMC-5 version,
2722 * to indicate to the Linux scsi midlayer this is a modern
2723 * device. 2) Ensure response data format / ATAPI information
2724 * are always correct.
a15dbeb4
JG		 2725 */
2726 if (buf[2] == 0) {
2727 buf[2] = 0x5;
2728 buf[3] = 0x32;
2729 }
2730
87340e98 2731 ata_scsi_rbuf_put(cmd, true, &flags);
1da177e4 2732 }
a15dbeb4 2733
1da177e4
LT		 2734 cmd->result = SAM_STAT_GOOD;
2735 }
2736
2aa8f5d6 2737 ata_qc_done(qc);
1da177e4
LT		 2738}
2739/**
2740 * atapi_xlat - Initialize PACKET taskfile
2741 * @qc: command structure to be initialized
1da177e4
LT		 2742 *
2743 * LOCKING:
cca3974e 2744 * spin_lock_irqsave(host lock)
1da177e4
LT		 2745 *
2746 * RETURNS:
2747 * Zero on success, non-zero on failure.
2748 */
ad706991 2749static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
1da177e4 2750{
542b1444 2751 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4 2752 struct ata_device *dev = qc->dev;
542b1444 2753 int nodata = (scmd->sc_data_direction == DMA_NONE);
5895ef9a 2754 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2db78dd3 2755 unsigned int nbytes;
1da177e4 2756
2e5704f6
TH		 2757 memset(qc->cdb, 0, dev->cdb_len);
2758 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
1da177e4
LT		 2759
2760 qc->complete_fn = atapi_qc_complete;
2761
2762 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
542b1444 2763 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1da177e4
LT		 2764 qc->tf.flags |= ATA_TFLAG_WRITE;
2765 DPRINTK("direction: write\n");
2766 }
2767
2768 qc->tf.command = ATA_CMD_PACKET;
aacda375 2769 ata_qc_set_pc_nbytes(qc);
e00f1ff3
TH		 2770
2771 /* check whether ATAPI DMA is safe */
5895ef9a 2772 if (!nodata && !using_pio && atapi_check_dma(qc))
e00f1ff3 2773 using_pio = 1;
1da177e4 2774
e190222d
TH		 2775 /* Some controller variants snoop this value for Packet
2776 * transfers to do state machine and FIFO management. Thus we
2777 * want to set it properly, and for DMA where it is
2778 * effectively meaningless.
2779 */
aacda375 2780 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2db78dd3 2781
e190222d
TH		 2782 /* Most ATAPI devices which honor transfer chunk size don't
2783 * behave according to the spec when odd chunk size which
2784 * matches the transfer length is specified. If the number of
2785 * bytes to transfer is 2n+1. According to the spec, what
2786 * should happen is to indicate that 2n+1 is going to be
2787 * transferred and transfer 2n+2 bytes where the last byte is
2788 * padding.
2789 *
2790 * In practice, this doesn't happen. ATAPI devices first
2791 * indicate and transfer 2n bytes and then indicate and
2792 * transfer 2 bytes where the last byte is padding.
2793 *
2794 * This inconsistency confuses several controllers which
2795 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2796 * These controllers use actual number of transferred bytes to
2797 * update DMA poitner and transfer of 4n+2 bytes make those
2798 * controller push DMA pointer by 4n+4 bytes because SATA data
2799 * FISes are aligned to 4 bytes. This causes data corruption
2800 * and buffer overrun.
2801 *
2802 * Always setting nbytes to even number solves this problem
2803 * because then ATAPI devices don't have to split data at 2n
2804 * boundaries.
2805 */
2806 if (nbytes & 0x1)
2807 nbytes++;
2808
2db78dd3
AC		 2809 qc->tf.lbam = (nbytes & 0xFF);
2810 qc->tf.lbah = (nbytes >> 8);
2811
5895ef9a
TH		 2812 if (nodata)
2813 qc->tf.protocol = ATAPI_PROT_NODATA;
2814 else if (using_pio)
2815 qc->tf.protocol = ATAPI_PROT_PIO;
2816 else {
e00f1ff3 2817 /* DMA data xfer */
0dc36888 2818 qc->tf.protocol = ATAPI_PROT_DMA;
1da177e4
LT		 2819 qc->tf.feature |= ATAPI_PKT_DMA;
2820
91163006
TH		 2821 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2822 (scmd->sc_data_direction != DMA_TO_DEVICE))
95de719a 2823 /* some SATA bridges need us to indicate data xfer direction */
1da177e4 2824 qc->tf.feature |= ATAPI_DMADIR;
1da177e4
LT		 2825 }
2826
2db78dd3
AC		 2827
2828 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2829 as ATAPI tape drives don't get this right otherwise */
1da177e4
LT		 2830 return 0;
2831}
2832
2dcb407e 2833static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
ab5b3a5b 2834{
071f44b1 2835 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 2836 if (likely(devno < ata_link_max_devices(&ap->link)))
2837 return &ap->link.device[devno];
2838 } else {
2839 if (likely(devno < ap->nr_pmp_links))
2840 return &ap->pmp_link[devno].device[0];
2841 }
2842
ab5b3a5b
TH		 2843 return NULL;
2844}
2845
2dcb407e
JG		 2846static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2847 const struct scsi_device *scsidev)
ab5b3a5b 2848{
41bda9c9
TH		 2849 int devno;
2850
ab5b3a5b 2851 /* skip commands not addressed to targets we simulate */
071f44b1 2852 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 2853 if (unlikely(scsidev->channel || scsidev->lun))
2854 return NULL;
2855 devno = scsidev->id;
2856 } else {
2857 if (unlikely(scsidev->id || scsidev->lun))
2858 return NULL;
2859 devno = scsidev->channel;
2860 }
ab5b3a5b 2861
41bda9c9 2862 return ata_find_dev(ap, devno);
ab5b3a5b
TH		 2863}
2864
1da177e4
LT		 2865/**
2866 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2867 * @ap: ATA port to which the device is attached
2868 * @scsidev: SCSI device from which we derive the ATA device
2869 *
2870 * Given various information provided in struct scsi_cmnd,
2871 * map that onto an ATA bus, and using that mapping
2872 * determine which ata_device is associated with the
2873 * SCSI command to be sent.
2874 *
2875 * LOCKING:
cca3974e 2876 * spin_lock_irqsave(host lock)
1da177e4
LT		 2877 *
2878 * RETURNS:
2879 * Associated ATA device, or %NULL if not found.
2880 */
1da177e4 2881static struct ata_device *
057ace5e 2882ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
1da177e4 2883{
ab5b3a5b 2884 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
1da177e4 2885
2486fa56 2886 if (unlikely(!dev || !ata_dev_enabled(dev)))
1da177e4
LT		 2887 return NULL;
2888
1da177e4
LT		 2889 return dev;
2890}
2891
b095518e
JG		 2892/*
2893 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2894 * @byte1: Byte 1 from pass-thru CDB.
2895 *
2896 * RETURNS:
2897 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2898 */
2899static u8
2900ata_scsi_map_proto(u8 byte1)
2901{
2902 switch((byte1 & 0x1e) >> 1) {
2dcb407e
JG		 2903 case 3: /* Non-data */
2904 return ATA_PROT_NODATA;
2905
2906 case 6: /* DMA */
2907 case 10: /* UDMA Data-in */
2908 case 11: /* UDMA Data-Out */
2909 return ATA_PROT_DMA;
2910
2911 case 4: /* PIO Data-in */
2912 case 5: /* PIO Data-out */
2913 return ATA_PROT_PIO;
2914
ee7fb331
VK		 2915 case 12: /* FPDMA */
2916 return ATA_PROT_NCQ;
2917
2dcb407e
JG		 2918 case 0: /* Hard Reset */
2919 case 1: /* SRST */
2920 case 8: /* Device Diagnostic */
2921 case 9: /* Device Reset */
2922 case 7: /* DMA Queued */
2dcb407e
JG		 2923 case 15: /* Return Response Info */
2924 default: /* Reserved */
2925 break;
b095518e
JG		 2926 }
2927
2928 return ATA_PROT_UNKNOWN;
2929}
2930
2931/**
2932 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2933 * @qc: command structure to be initialized
b095518e
JG		 2934 *
2935 * Handles either 12 or 16-byte versions of the CDB.
2936 *
2937 * RETURNS:
2938 * Zero on success, non-zero on failure.
2939 */
ad706991 2940static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
b095518e
JG		 2941{
2942 struct ata_taskfile *tf = &(qc->tf);
542b1444 2943 struct scsi_cmnd *scmd = qc->scsicmd;
f79d409f 2944 struct ata_device *dev = qc->dev;
ad706991 2945 const u8 *cdb = scmd->cmnd;
b095518e 2946
542b1444 2947 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
9a405257 2948 goto invalid_fld;
8190bdb9 2949
5f8e7f17
VK		 2950 /* enable LBA */
2951 tf->flags |= ATA_TFLAG_LBA;
2952
b095518e
JG		 2953 /*
2954 * 12 and 16 byte CDBs use different offsets to
2955 * provide the various register values.
2956 */
542b1444 2957 if (cdb[0] == ATA_16) {
b095518e
JG		 2958 /*
2959 * 16-byte CDB - may contain extended commands.
2960 *
2961 * If that is the case, copy the upper byte register values.
2962 */
542b1444
TH		 2963 if (cdb[1] & 0x01) {
2964 tf->hob_feature = cdb[3];
2965 tf->hob_nsect = cdb[5];
2966 tf->hob_lbal = cdb[7];
2967 tf->hob_lbam = cdb[9];
2968 tf->hob_lbah = cdb[11];
b095518e
JG		 2969 tf->flags |= ATA_TFLAG_LBA48;
2970 } else
2971 tf->flags &= ~ATA_TFLAG_LBA48;
2972
2973 /*
2974 * Always copy low byte, device and command registers.
2975 */
542b1444
TH		 2976 tf->feature = cdb[4];
2977 tf->nsect = cdb[6];
2978 tf->lbal = cdb[8];
2979 tf->lbam = cdb[10];
2980 tf->lbah = cdb[12];
2981 tf->device = cdb[13];
2982 tf->command = cdb[14];
b095518e
JG		 2983 } else {
2984 /*
2985 * 12-byte CDB - incapable of extended commands.
2986 */
2987 tf->flags &= ~ATA_TFLAG_LBA48;
2988
542b1444
TH		 2989 tf->feature = cdb[3];
2990 tf->nsect = cdb[4];
2991 tf->lbal = cdb[5];
2992 tf->lbam = cdb[6];
2993 tf->lbah = cdb[7];
2994 tf->device = cdb[8];
2995 tf->command = cdb[9];
b095518e 2996 }
fa4453c4 2997
ee7fb331
VK		 2998 /* For NCQ commands with FPDMA protocol, copy the tag value */
2999 if (tf->protocol == ATA_PROT_NCQ)
3000 tf->nsect = qc->tag << 3;
3001
fa4453c4
AL		 3002 /* enforce correct master/slave bit */
3003 tf->device = dev->devno ?
3004 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
b095518e 3005
bd30add8 3006 switch (tf->command) {
295124dc 3007 /* READ/WRITE LONG use a non-standard sect_size */
bd30add8
TH		 3008 case ATA_CMD_READ_LONG:
3009 case ATA_CMD_READ_LONG_ONCE:
3010 case ATA_CMD_WRITE_LONG:
3011 case ATA_CMD_WRITE_LONG_ONCE:
3012 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
3013 goto invalid_fld;
3014 qc->sect_size = scsi_bufflen(scmd);
295124dc
GG		 3015 break;
3016
3017 /* commands using reported Logical Block size (e.g. 512 or 4K) */
3018 case ATA_CMD_CFA_WRITE_NE:
3019 case ATA_CMD_CFA_TRANS_SECT:
3020 case ATA_CMD_CFA_WRITE_MULT_NE:
3021 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
3022 case ATA_CMD_READ:
3023 case ATA_CMD_READ_EXT:
3024 case ATA_CMD_READ_QUEUED:
3025 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
3026 case ATA_CMD_FPDMA_READ:
3027 case ATA_CMD_READ_MULTI:
3028 case ATA_CMD_READ_MULTI_EXT:
3029 case ATA_CMD_PIO_READ:
3030 case ATA_CMD_PIO_READ_EXT:
3031 case ATA_CMD_READ_STREAM_DMA_EXT:
3032 case ATA_CMD_READ_STREAM_EXT:
3033 case ATA_CMD_VERIFY:
3034 case ATA_CMD_VERIFY_EXT:
3035 case ATA_CMD_WRITE:
3036 case ATA_CMD_WRITE_EXT:
3037 case ATA_CMD_WRITE_FUA_EXT:
3038 case ATA_CMD_WRITE_QUEUED:
3039 case ATA_CMD_WRITE_QUEUED_FUA_EXT:
3040 case ATA_CMD_FPDMA_WRITE:
3041 case ATA_CMD_WRITE_MULTI:
3042 case ATA_CMD_WRITE_MULTI_EXT:
3043 case ATA_CMD_WRITE_MULTI_FUA_EXT:
3044 case ATA_CMD_PIO_WRITE:
3045 case ATA_CMD_PIO_WRITE_EXT:
3046 case ATA_CMD_WRITE_STREAM_DMA_EXT:
3047 case ATA_CMD_WRITE_STREAM_EXT:
3048 qc->sect_size = scmd->device->sector_size;
3049 break;
3050
3051 /* Everything else uses 512 byte "sectors" */
3052 default:
3053 qc->sect_size = ATA_SECT_SIZE;
bd30add8
TH		 3054 }
3055
3056 /*
3057 * Set flags so that all registers will be written, pass on
3058 * write indication (used for PIO/DMA setup), result TF is
3059 * copied back and we don't whine too much about its failure.
3060 */
bc496ed0 3061 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
bd30add8
TH		 3062 if (scmd->sc_data_direction == DMA_TO_DEVICE)
3063 tf->flags |= ATA_TFLAG_WRITE;
3064
3065 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
3066
3067 /*
3068 * Set transfer length.
3069 *
3070 * TODO: find out if we need to do more here to
3071 * cover scatter/gather case.
3072 */
3073 ata_qc_set_pc_nbytes(qc);
3074
3075 /* We may not issue DMA commands if no DMA mode is set */
3076 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
3077 goto invalid_fld;
3078
1dce589c
AL		 3079 /* sanity check for pio multi commands */
3080 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
3081 goto invalid_fld;
3082
3083 if (is_multi_taskfile(tf)) {
3084 unsigned int multi_count = 1 << (cdb[1] >> 5);
3085
3086 /* compare the passed through multi_count
3087 * with the cached multi_count of libata
3088 */
3089 if (multi_count != dev->multi_count)
a9a79dfe
JP		 3090 ata_dev_warn(dev, "invalid multi_count %u ignored\n",
3091 multi_count);
d26fc955 3092 }
1dce589c 3093
b095518e
JG		 3094 /*
3095 * Filter SET_FEATURES - XFER MODE command -- otherwise,
3096 * SET_FEATURES - XFER MODE must be preceded/succeeded
3097 * by an update to hardware-specific registers for each
3098 * controller (i.e. the reason for ->set_piomode(),
3099 * ->set_dmamode(), and ->post_set_mode() hooks).
3100 */
bd30add8
TH		 3101 if (tf->command == ATA_CMD_SET_FEATURES &&
3102 tf->feature == SETFEATURES_XFER)
9a405257 3103 goto invalid_fld;
b095518e
JG		 3104
3105 /*
bd30add8
TH		 3106 * Filter TPM commands by default. These provide an
3107 * essentially uncontrolled encrypted "back door" between
3108 * applications and the disk. Set libata.allow_tpm=1 if you
3109 * have a real reason for wanting to use them. This ensures
3110 * that installed software cannot easily mess stuff up without
3111 * user intent. DVR type users will probably ship with this enabled
3112 * for movie content management.
b095518e 3113 *
bd30add8
TH		 3114 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3115 * for this and should do in future but that it is not sufficient as
3116 * DCS is an optional feature set. Thus we also do the software filter
3117 * so that we comply with the TC consortium stated goal that the user
3118 * can turn off TC features of their system.
b095518e 3119 */
bd30add8
TH		 3120 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
3121 goto invalid_fld;
e61e0672 3122
b095518e 3123 return 0;
9a405257
TH		 3124
3125 invalid_fld:
542b1444 3126 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
9a405257
TH		 3127 /* "Invalid field in cdb" */
3128 return 1;
b095518e
JG		 3129}
3130
18f0f978
CH		 3131static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3132{
3133 struct ata_taskfile *tf = &qc->tf;
3134 struct scsi_cmnd *scmd = qc->scsicmd;
3135 struct ata_device *dev = qc->dev;
3136 const u8 *cdb = scmd->cmnd;
3137 u64 block;
3138 u32 n_block;
3139 u32 size;
3140 void *buf;
3141
3142 /* we may not issue DMA commands if no DMA mode is set */
3143 if (unlikely(!dev->dma_mode))
3144 goto invalid_fld;
3145
3146 if (unlikely(scmd->cmd_len < 16))
3147 goto invalid_fld;
3148 scsi_16_lba_len(cdb, &block, &n_block);
3149
3150 /* for now we only support WRITE SAME with the unmap bit set */
3151 if (unlikely(!(cdb[1] & 0x8)))
3152 goto invalid_fld;
3153
3154 /*
3155 * WRITE SAME always has a sector sized buffer as payload, this
3156 * should never be a multiple entry S/G list.
3157 */
3158 if (!scsi_sg_count(scmd))
3159 goto invalid_fld;
3160
3161 buf = page_address(sg_page(scsi_sglist(scmd)));
d0634c4a 3162 size = ata_set_lba_range_entries(buf, 512, block, n_block);
18f0f978 3163
87fb6c31
MC		 3164 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) {
3165 /* Newer devices support queued TRIM commands */
3166 tf->protocol = ATA_PROT_NCQ;
3167 tf->command = ATA_CMD_FPDMA_SEND;
3168 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f;
3169 tf->nsect = qc->tag << 3;
3170 tf->hob_feature = (size / 512) >> 8;
3171 tf->feature = size / 512;
3172
3173 tf->auxiliary = 1;
3174 } else {
3175 tf->protocol = ATA_PROT_DMA;
3176 tf->hob_feature = 0;
3177 tf->feature = ATA_DSM_TRIM;
3178 tf->hob_nsect = (size / 512) >> 8;
3179 tf->nsect = size / 512;
3180 tf->command = ATA_CMD_DSM;
3181 }
3182
18f0f978
CH		 3183 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3184 ATA_TFLAG_WRITE;
3185
3186 ata_qc_set_pc_nbytes(qc);
3187
3188 return 0;
3189
3190 invalid_fld:
3191 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3192 /* "Invalid field in cdb" */
3193 return 1;
3194}
3195
1b26d29c
PB		 3196/**
3197 * ata_mselect_caching - Simulate MODE SELECT for caching info page
3198 * @qc: Storage for translated ATA taskfile
3199 * @buf: input buffer
3200 * @len: number of valid bytes in the input buffer
3201 *
3202 * Prepare a taskfile to modify caching information for the device.
3203 *
3204 * LOCKING:
3205 * None.
3206 */
3207static int ata_mselect_caching(struct ata_queued_cmd *qc,
3208 const u8 *buf, int len)
3209{
3210 struct ata_taskfile *tf = &qc->tf;
3211 struct ata_device *dev = qc->dev;
3212 char mpage[CACHE_MPAGE_LEN];
3213 u8 wce;
3214
3215 /*
3216 * The first two bytes of def_cache_mpage are a header, so offsets
3217 * in mpage are off by 2 compared to buf. Same for len.
3218 */
3219
3220 if (len != CACHE_MPAGE_LEN - 2)
3221 return -EINVAL;
3222
3223 wce = buf[0] & (1 << 2);
3224
3225 /*
3226 * Check that read-only bits are not modified.
3227 */
3228 ata_msense_caching(dev->id, mpage, false);
3229 mpage[2] &= ~(1 << 2);
3230 mpage[2] |= wce;
3231 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0)
3232 return -EINVAL;
3233
3234 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3235 tf->protocol = ATA_PROT_NODATA;
3236 tf->nsect = 0;
3237 tf->command = ATA_CMD_SET_FEATURES;
3238 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF;
3239 return 0;
3240}
3241
3242/**
3243 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands
3244 * @qc: Storage for translated ATA taskfile
3245 *
3246 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
3247 * Assume this is invoked for direct access devices (e.g. disks) only.
3248 * There should be no block descriptor for other device types.
3249 *
3250 * LOCKING:
3251 * spin_lock_irqsave(host lock)
3252 */
3253static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
3254{
3255 struct scsi_cmnd *scmd = qc->scsicmd;
3256 const u8 *cdb = scmd->cmnd;
3257 const u8 *p;
3258 u8 pg, spg;
3259 unsigned six_byte, pg_len, hdr_len, bd_len;
3260 int len;
3261
3262 VPRINTK("ENTER\n");
3263
3264 six_byte = (cdb[0] == MODE_SELECT);
3265 if (six_byte) {
3266 if (scmd->cmd_len < 5)
3267 goto invalid_fld;
3268
3269 len = cdb[4];
3270 hdr_len = 4;
3271 } else {
3272 if (scmd->cmd_len < 9)
3273 goto invalid_fld;
3274
3275 len = (cdb[7] << 8) + cdb[8];
3276 hdr_len = 8;
3277 }
3278
3279 /* We only support PF=1, SP=0. */
3280 if ((cdb[1] & 0x11) != 0x10)
3281 goto invalid_fld;
3282
3283 /* Test early for possible overrun. */
3284 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len)
3285 goto invalid_param_len;
3286
3287 p = page_address(sg_page(scsi_sglist(scmd)));
3288
3289 /* Move past header and block descriptors. */
3290 if (len < hdr_len)
3291 goto invalid_param_len;
3292
3293 if (six_byte)
3294 bd_len = p[3];
3295 else
3296 bd_len = (p[6] << 8) + p[7];
3297
3298 len -= hdr_len;
3299 p += hdr_len;
3300 if (len < bd_len)
3301 goto invalid_param_len;
3302 if (bd_len != 0 && bd_len != 8)
3303 goto invalid_param;
3304
3305 len -= bd_len;
3306 p += bd_len;
3307 if (len == 0)
3308 goto skip;
3309
3310 /* Parse both possible formats for the mode page headers. */
3311 pg = p[0] & 0x3f;
3312 if (p[0] & 0x40) {
3313 if (len < 4)
3314 goto invalid_param_len;
3315
3316 spg = p[1];
3317 pg_len = (p[2] << 8) | p[3];
3318 p += 4;
3319 len -= 4;
3320 } else {
3321 if (len < 2)
3322 goto invalid_param_len;
3323
3324 spg = 0;
3325 pg_len = p[1];
3326 p += 2;
3327 len -= 2;
3328 }
3329
3330 /*
3331 * No mode subpages supported (yet) but asking for _all_
3332 * subpages may be valid
3333 */
3334 if (spg && (spg != ALL_SUB_MPAGES))
3335 goto invalid_param;
3336 if (pg_len > len)
3337 goto invalid_param_len;
3338
3339 switch (pg) {
3340 case CACHE_MPAGE:
3341 if (ata_mselect_caching(qc, p, pg_len) < 0)
3342 goto invalid_param;
3343 break;
3344
3345 default: /* invalid page code */
3346 goto invalid_param;
3347 }
3348
3349 /*
3350 * Only one page has changeable data, so we only support setting one
3351 * page at a time.
3352 */
3353 if (len > pg_len)
3354 goto invalid_param;
3355
3356 return 0;
3357
3358 invalid_fld:
3359 /* "Invalid field in CDB" */
3360 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
3361 return 1;
3362
3363 invalid_param:
3364 /* "Invalid field in parameter list" */
3365 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0);
3366 return 1;
3367
3368 invalid_param_len:
3369 /* "Parameter list length error" */
3370 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3371 return 1;
3372
3373 skip:
3374 scmd->result = SAM_STAT_GOOD;
3375 return 1;
3376}
3377
1da177e4
LT		 3378/**
3379 * ata_get_xlat_func - check if SCSI to ATA translation is possible
3380 * @dev: ATA device
3381 * @cmd: SCSI command opcode to consider
3382 *
3383 * Look up the SCSI command given, and determine whether the
3384 * SCSI command is to be translated or simulated.
3385 *
3386 * RETURNS:
3387 * Pointer to translation function if possible, %NULL if not.
3388 */
3389
3390static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
3391{
3392 switch (cmd) {
3393 case READ_6:
3394 case READ_10:
3395 case READ_16:
3396
3397 case WRITE_6:
3398 case WRITE_10:
3399 case WRITE_16:
3400 return ata_scsi_rw_xlat;
3401
0cdd6eb7 3402 case WRITE_SAME_16:
18f0f978
CH		 3403 return ata_scsi_write_same_xlat;
3404
1da177e4
LT		 3405 case SYNCHRONIZE_CACHE:
3406 if (ata_try_flush_cache(dev))
3407 return ata_scsi_flush_xlat;
3408 break;
3409
3410 case VERIFY:
3411 case VERIFY_16:
3412 return ata_scsi_verify_xlat;
b095518e
JG		 3413
3414 case ATA_12:
3415 case ATA_16:
3416 return ata_scsi_pass_thru;
da61396d 3417
1b26d29c
PB		 3418 case MODE_SELECT:
3419 case MODE_SELECT_10:
3420 return ata_scsi_mode_select_xlat;
3421 break;
3422
972dcafb
DG		 3423 case START_STOP:
3424 return ata_scsi_start_stop_xlat;
1da177e4
LT		 3425 }
3426
3427 return NULL;
3428}
3429
3430/**
3431 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3432 * @ap: ATA port to which the command was being sent
3433 * @cmd: SCSI command to dump
3434 *
3435 * Prints the contents of a SCSI command via printk().
3436 */
3437
3438static inline void ata_scsi_dump_cdb(struct ata_port *ap,
3439 struct scsi_cmnd *cmd)
3440{
3441#ifdef ATA_DEBUG
3442 struct scsi_device *scsidev = cmd->device;
3443 u8 *scsicmd = cmd->cmnd;
3444
3445 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
44877b4e 3446 ap->print_id,
1da177e4
LT		 3447 scsidev->channel, scsidev->id, scsidev->lun,
3448 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
3449 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
3450 scsicmd[8]);
3451#endif
3452}
3453
542b1444 3454static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2115ea94 3455 struct ata_device *dev)
eb3f0f9c 3456{
baf4fdfa
ML		 3457 u8 scsi_op = scmd->cmnd[0];
3458 ata_xlat_func_t xlat_func;
2115ea94
TH		 3459 int rc = 0;
3460
9162c657 3461 if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
baf4fdfa
ML		 3462 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
3463 goto bad_cdb_len;
eb3f0f9c 3464
baf4fdfa
ML		 3465 xlat_func = ata_get_xlat_func(dev, scsi_op);
3466 } else {
3467 if (unlikely(!scmd->cmd_len))
3468 goto bad_cdb_len;
3469
3470 xlat_func = NULL;
3471 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
3472 /* relay SCSI command to ATAPI device */
607126c2
ML		 3473 int len = COMMAND_SIZE(scsi_op);
3474 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
baf4fdfa
ML		 3475 goto bad_cdb_len;
3476
3477 xlat_func = atapi_xlat;
3478 } else {
3479 /* ATA_16 passthru, treat as an ATA command */
3480 if (unlikely(scmd->cmd_len > 16))
3481 goto bad_cdb_len;
3482
3483 xlat_func = ata_get_xlat_func(dev, scsi_op);
3484 }
3485 }
3486
3487 if (xlat_func)
b27dcfb0 3488 rc = ata_scsi_translate(dev, scmd, xlat_func);
baf4fdfa 3489 else
b27dcfb0 3490 ata_scsi_simulate(dev, scmd);
2115ea94
TH		 3491
3492 return rc;
baf4fdfa
ML		 3493
3494 bad_cdb_len:
3495 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3496 scmd->cmd_len, scsi_op, dev->cdb_len);
3497 scmd->result = DID_ERROR << 16;
b27dcfb0 3498 scmd->scsi_done(scmd);
baf4fdfa 3499 return 0;
eb3f0f9c
BK		 3500}
3501
1da177e4
LT		 3502/**
3503 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
23e701e6 3504 * @shost: SCSI host of command to be sent
1da177e4 3505 * @cmd: SCSI command to be sent
1da177e4
LT		 3506 *
3507 * In some cases, this function translates SCSI commands into
3508 * ATA taskfiles, and queues the taskfiles to be sent to
3509 * hardware. In other cases, this function simulates a
3510 * SCSI device by evaluating and responding to certain
3511 * SCSI commands. This creates the overall effect of
3512 * ATA and ATAPI devices appearing as SCSI devices.
3513 *
3514 * LOCKING:
23e701e6 3515 * ATA host lock
1da177e4
LT		 3516 *
3517 * RETURNS:
2115ea94
TH		 3518 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3519 * 0 otherwise.
1da177e4 3520 */
23e701e6 3521int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
1da177e4
LT		 3522{
3523 struct ata_port *ap;
3524 struct ata_device *dev;
3525 struct scsi_device *scsidev = cmd->device;
2115ea94 3526 int rc = 0;
23e701e6 3527 unsigned long irq_flags;
1da177e4 3528
35bb94b1 3529 ap = ata_shost_to_port(shost);
005a5a06 3530
23e701e6 3531 spin_lock_irqsave(ap->lock, irq_flags);
1da177e4
LT		 3532
3533 ata_scsi_dump_cdb(ap, cmd);
3534
3535 dev = ata_scsi_find_dev(ap, scsidev);
eb3f0f9c 3536 if (likely(dev))
b27dcfb0 3537 rc = __ata_scsi_queuecmd(cmd, dev);
eb3f0f9c 3538 else {
1da177e4 3539 cmd->result = (DID_BAD_TARGET << 16);
23e701e6 3540 cmd->scsi_done(cmd);
1da177e4
LT		 3541 }
3542
23e701e6
JG		 3543 spin_unlock_irqrestore(ap->lock, irq_flags);
3544
2115ea94 3545 return rc;
1da177e4
LT		 3546}
3547
3548/**
3549 * ata_scsi_simulate - simulate SCSI command on ATA device
c893a3ae 3550 * @dev: the target device
1da177e4 3551 * @cmd: SCSI command being sent to device.
1da177e4
LT		 3552 *
3553 * Interprets and directly executes a select list of SCSI commands
3554 * that can be handled internally.
3555 *
3556 * LOCKING:
cca3974e 3557 * spin_lock_irqsave(host lock)
1da177e4
LT		 3558 */
3559
b27dcfb0 3560void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
1da177e4
LT		 3561{
3562 struct ata_scsi_args args;
057ace5e 3563 const u8 *scsicmd = cmd->cmnd;
45394145 3564 u8 tmp8;
1da177e4 3565
9a3dccc4
TH		 3566 args.dev = dev;
3567 args.id = dev->id;
1da177e4 3568 args.cmd = cmd;
b27dcfb0 3569 args.done = cmd->scsi_done;
1da177e4
LT		 3570
3571 switch(scsicmd[0]) {
2dcb407e
JG		 3572 /* TODO: worth improving? */
3573 case FORMAT_UNIT:
b27dcfb0 3574 ata_scsi_invalid_field(cmd);
2dcb407e
JG		 3575 break;
3576
3577 case INQUIRY:
3578 if (scsicmd[1] & 2) /* is CmdDt set? */
b27dcfb0 3579 ata_scsi_invalid_field(cmd);
2dcb407e
JG		 3580 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3581 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3582 else switch (scsicmd[2]) {
3583 case 0x00:
3584 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
1da177e4 3585 break;
2dcb407e
JG		 3586 case 0x80:
3587 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
1da177e4 3588 break;
2dcb407e
JG		 3589 case 0x83:
3590 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
1da177e4 3591 break;
2dcb407e
JG		 3592 case 0x89:
3593 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3594 break;
18f0f978
CH		 3595 case 0xb0:
3596 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
3597 break;
1e9dbc92
MW		 3598 case 0xb1:
3599 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3600 break;
02e0a604
MP		 3601 case 0xb2:
3602 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
3603 break;
2dcb407e 3604 default:
b27dcfb0 3605 ata_scsi_invalid_field(cmd);
1da177e4 3606 break;
2dcb407e
JG		 3607 }
3608 break;
3609
3610 case MODE_SENSE:
3611 case MODE_SENSE_10:
3612 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3613 break;
3614
2dcb407e
JG		 3615 case READ_CAPACITY:
3616 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3617 break;
3618
eb846d9f 3619 case SERVICE_ACTION_IN_16:
2dcb407e 3620 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
1da177e4 3621 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2dcb407e 3622 else
b27dcfb0 3623 ata_scsi_invalid_field(cmd);
2dcb407e 3624 break;
1da177e4 3625
2dcb407e
JG		 3626 case REPORT_LUNS:
3627 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3628 break;
1da177e4 3629
2dcb407e
JG		 3630 case REQUEST_SENSE:
3631 ata_scsi_set_sense(cmd, 0, 0, 0);
3632 cmd->result = (DRIVER_SENSE << 24);
b27dcfb0 3633 cmd->scsi_done(cmd);
2dcb407e 3634 break;
1da177e4 3635
2dcb407e
JG		 3636 /* if we reach this, then writeback caching is disabled,
3637 * turning this into a no-op.
3638 */
3639 case SYNCHRONIZE_CACHE:
3640 /* fall through */
3641
3642 /* no-op's, complete with success */
3643 case REZERO_UNIT:
3644 case SEEK_6:
3645 case SEEK_10:
3646 case TEST_UNIT_READY:
3647 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3648 break;
45394145 3649
2dcb407e
JG		 3650 case SEND_DIAGNOSTIC:
3651 tmp8 = scsicmd[1] & ~(1 << 3);
3652 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
00bd0202 3653 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
2dcb407e 3654 else
b27dcfb0 3655 ata_scsi_invalid_field(cmd);
2dcb407e 3656 break;
1da177e4 3657
2dcb407e
JG		 3658 /* all other commands */
3659 default:
3660 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3661 /* "Invalid command operation code" */
b27dcfb0 3662 cmd->scsi_done(cmd);
2dcb407e 3663 break;
1da177e4
LT		 3664 }
3665}
3666
f3187195
TH		 3667int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3668{
3669 int i, rc;
3670
3671 for (i = 0; i < host->n_ports; i++) {
3672 struct ata_port *ap = host->ports[i];
3673 struct Scsi_Host *shost;
3674
3675 rc = -ENOMEM;
3676 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3677 if (!shost)
3678 goto err_alloc;
3679
9ee4f393 3680 shost->eh_noresume = 1;
f3187195
TH		 3681 *(struct ata_port **)&shost->hostdata[0] = ap;
3682 ap->scsi_host = shost;
3683
d9027470 3684 shost->transportt = ata_scsi_transport_template;
f3187195
TH		 3685 shost->unique_id = ap->print_id;
3686 shost->max_id = 16;
3687 shost->max_lun = 1;
3688 shost->max_channel = 1;
3689 shost->max_cmd_len = 16;
54b2b50c 3690 shost->no_write_same = 1;
f3187195 3691
31cc23b3
TH		 3692 /* Schedule policy is determined by ->qc_defer()
3693 * callback and it needs to see every deferred qc.
3694 * Set host_blocked to 1 to prevent SCSI midlayer from
3695 * automatically deferring requests.
3696 */
3697 shost->max_host_blocked = 1;
3698
98bd4be1
SL		 3699 if (scsi_init_shared_tag_map(shost, host->n_tags))
3700 goto err_add;
12cb5ce1 3701
f8fc75dc
LM		 3702 rc = scsi_add_host_with_dma(ap->scsi_host,
3703 &ap->tdev, ap->host->dev);
f3187195
TH		 3704 if (rc)
3705 goto err_add;
3706 }
3707
3708 return 0;
3709
3710 err_add:
3711 scsi_host_put(host->ports[i]->scsi_host);
3712 err_alloc:
3713 while (--i >= 0) {
3714 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3715
3716 scsi_remove_host(shost);
3717 scsi_host_put(shost);
3718 }
3719 return rc;
3720}
3721
1ae46317 3722void ata_scsi_scan_host(struct ata_port *ap, int sync)
644dd0cc 3723{
1ae46317
TH		 3724 int tries = 5;
3725 struct ata_device *last_failed_dev = NULL;
41bda9c9 3726 struct ata_link *link;
1ae46317 3727 struct ata_device *dev;
644dd0cc 3728
1ae46317 3729 repeat:
1eca4365
TH		 3730 ata_for_each_link(link, ap, EDGE) {
3731 ata_for_each_dev(dev, link, ENABLED) {
41bda9c9
TH		 3732 struct scsi_device *sdev;
3733 int channel = 0, id = 0;
3edebac4 3734
1eca4365 3735 if (dev->sdev)
41bda9c9 3736 continue;
3f19ee8c 3737
41bda9c9
TH		 3738 if (ata_is_host_link(link))
3739 id = dev->devno;
3740 else
3741 channel = link->pmp;
3742
3743 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3744 NULL);
3745 if (!IS_ERR(sdev)) {
3746 dev->sdev = sdev;
3747 scsi_device_put(sdev);
295124dc
GG		 3748 } else {
3749 dev->sdev = NULL;
41bda9c9 3750 }
3edebac4 3751 }
3f19ee8c 3752 }
1ae46317
TH		 3753
3754 /* If we scanned while EH was in progress or allocation
3755 * failure occurred, scan would have failed silently. Check
3756 * whether all devices are attached.
3757 */
1eca4365
TH		 3758 ata_for_each_link(link, ap, EDGE) {
3759 ata_for_each_dev(dev, link, ENABLED) {
3760 if (!dev->sdev)
41bda9c9
TH		 3761 goto exit_loop;
3762 }
1ae46317 3763 }
41bda9c9
TH		 3764 exit_loop:
3765 if (!link)
1ae46317
TH		 3766 return;
3767
3768 /* we're missing some SCSI devices */
3769 if (sync) {
3770 /* If caller requested synchrnous scan && we've made
3771 * any progress, sleep briefly and repeat.
3772 */
3773 if (dev != last_failed_dev) {
3774 msleep(100);
3775 last_failed_dev = dev;
3776 goto repeat;
3777 }
3778
3779 /* We might be failing to detect boot device, give it
3780 * a few more chances.
3781 */
3782 if (--tries) {
3783 msleep(100);
3784 goto repeat;
3785 }
3786
a9a79dfe
JP		 3787 ata_port_err(ap,
3788 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
1ae46317
TH		 3789 }
3790
ad72cf98 3791 queue_delayed_work(system_long_wq, &ap->hotplug_task,
1ae46317 3792 round_jiffies_relative(HZ));
644dd0cc 3793}
0ea035a3
TH		 3794
3795/**
3796 * ata_scsi_offline_dev - offline attached SCSI device
3797 * @dev: ATA device to offline attached SCSI device for
3798 *
3799 * This function is called from ata_eh_hotplug() and responsible
3800 * for taking the SCSI device attached to @dev offline. This
cca3974e 3801 * function is called with host lock which protects dev->sdev
0ea035a3
TH		 3802 * against clearing.
3803 *
3804 * LOCKING:
cca3974e 3805 * spin_lock_irqsave(host lock)
0ea035a3
TH		 3806 *
3807 * RETURNS:
3808 * 1 if attached SCSI device exists, 0 otherwise.
3809 */
3810int ata_scsi_offline_dev(struct ata_device *dev)
3811{
3812 if (dev->sdev) {
3813 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3814 return 1;
3815 }
3816 return 0;
3817}
580b2102
TH		 3818
3819/**
3820 * ata_scsi_remove_dev - remove attached SCSI device
3821 * @dev: ATA device to remove attached SCSI device for
3822 *
3823 * This function is called from ata_eh_scsi_hotplug() and
3824 * responsible for removing the SCSI device attached to @dev.
3825 *
3826 * LOCKING:
3827 * Kernel thread context (may sleep).
3828 */
3829static void ata_scsi_remove_dev(struct ata_device *dev)
3830{
9af5c9c9 3831 struct ata_port *ap = dev->link->ap;
580b2102
TH		 3832 struct scsi_device *sdev;
3833 unsigned long flags;
3834
3835 /* Alas, we need to grab scan_mutex to ensure SCSI device
3836 * state doesn't change underneath us and thus
3837 * scsi_device_get() always succeeds. The mutex locking can
3838 * be removed if there is __scsi_device_get() interface which
3839 * increments reference counts regardless of device state.
3840 */
cca3974e 3841 mutex_lock(&ap->scsi_host->scan_mutex);
ba6a1308 3842 spin_lock_irqsave(ap->lock, flags);
580b2102 3843
cca3974e 3844 /* clearing dev->sdev is protected by host lock */
580b2102
TH		 3845 sdev = dev->sdev;
3846 dev->sdev = NULL;
3847
3848 if (sdev) {
3849 /* If user initiated unplug races with us, sdev can go
cca3974e 3850 * away underneath us after the host lock and
580b2102
TH		 3851 * scan_mutex are released. Hold onto it.
3852 */
3853 if (scsi_device_get(sdev) == 0) {
3854 /* The following ensures the attached sdev is
3855 * offline on return from ata_scsi_offline_dev()
3856 * regardless it wins or loses the race
3857 * against this function.
3858 */
3859 scsi_device_set_state(sdev, SDEV_OFFLINE);
3860 } else {
3861 WARN_ON(1);
3862 sdev = NULL;
3863 }
3864 }
3865
ba6a1308 3866 spin_unlock_irqrestore(ap->lock, flags);
cca3974e 3867 mutex_unlock(&ap->scsi_host->scan_mutex);
580b2102
TH		 3868
3869 if (sdev) {
a9a79dfe
JP		 3870 ata_dev_info(dev, "detaching (SCSI %s)\n",
3871 dev_name(&sdev->sdev_gendev));
580b2102
TH		 3872
3873 scsi_remove_device(sdev);
3874 scsi_device_put(sdev);
3875 }
3876}
3877
41bda9c9
TH		 3878static void ata_scsi_handle_link_detach(struct ata_link *link)
3879{
3880 struct ata_port *ap = link->ap;
3881 struct ata_device *dev;
3882
1eca4365 3883 ata_for_each_dev(dev, link, ALL) {
41bda9c9
TH		 3884 unsigned long flags;
3885
3886 if (!(dev->flags & ATA_DFLAG_DETACHED))
3887 continue;
3888
3889 spin_lock_irqsave(ap->lock, flags);
3890 dev->flags &= ~ATA_DFLAG_DETACHED;
3891 spin_unlock_irqrestore(ap->lock, flags);
3892
f1bc1e4c
AL		 3893 if (zpodd_dev_enabled(dev))
3894 zpodd_exit(dev);
3895
41bda9c9
TH		 3896 ata_scsi_remove_dev(dev);
3897 }
3898}
3899
2f294968
KCA		 3900/**
3901 * ata_scsi_media_change_notify - send media change event
c5d0e6a0 3902 * @dev: Pointer to the disk device with media change event
2f294968
KCA		 3903 *
3904 * Tell the block layer to send a media change notification
3905 * event.
3906 *
3907 * LOCKING:
854c73a2 3908 * spin_lock_irqsave(host lock)
2f294968 3909 */
854c73a2 3910void ata_scsi_media_change_notify(struct ata_device *dev)
2f294968 3911{
854c73a2 3912 if (dev->sdev)
f26792d5
JG		 3913 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3914 GFP_ATOMIC);
2f294968 3915}
2f294968 3916
580b2102
TH		 3917/**
3918 * ata_scsi_hotplug - SCSI part of hotplug
65f27f38 3919 * @work: Pointer to ATA port to perform SCSI hotplug on
580b2102
TH		 3920 *
3921 * Perform SCSI part of hotplug. It's executed from a separate
3922 * workqueue after EH completes. This is necessary because SCSI
3923 * hot plugging requires working EH and hot unplugging is
3924 * synchronized with hot plugging with a mutex.
3925 *
3926 * LOCKING:
3927 * Kernel thread context (may sleep).
3928 */
65f27f38 3929void ata_scsi_hotplug(struct work_struct *work)
580b2102 3930{
65f27f38
DH		 3931 struct ata_port *ap =
3932 container_of(work, struct ata_port, hotplug_task.work);
41bda9c9 3933 int i;
580b2102 3934
b51e9e5d 3935 if (ap->pflags & ATA_PFLAG_UNLOADING) {
580b2102
TH		 3936 DPRINTK("ENTER/EXIT - unloading\n");
3937 return;
3938 }
3939
85fbd722
TH		 3940 /*
3941 * XXX - UGLY HACK
3942 *
3943 * The block layer suspend/resume path is fundamentally broken due
3944 * to freezable kthreads and workqueue and may deadlock if a block
3945 * device gets removed while resume is in progress. I don't know
3946 * what the solution is short of removing freezable kthreads and
3947 * workqueues altogether.
3948 *
3949 * The following is an ugly hack to avoid kicking off device
3950 * removal while freezer is active. This is a joke but does avoid
3951 * this particular deadlock scenario.
3952 *
3953 * https://bugzilla.kernel.org/show_bug.cgi?id=62801
3954 * http://marc.info/?l=linux-kernel&m=138695698516487
3955 */
3956#ifdef CONFIG_FREEZER
3957 while (pm_freezing)
3958 msleep(10);
3959#endif
3960
580b2102 3961 DPRINTK("ENTER\n");
ad72cf98 3962 mutex_lock(&ap->scsi_scan_mutex);
580b2102 3963
41bda9c9
TH		 3964 /* Unplug detached devices. We cannot use link iterator here
3965 * because PMP links have to be scanned even if PMP is
3966 * currently not attached. Iterate manually.
3967 */
3968 ata_scsi_handle_link_detach(&ap->link);
3969 if (ap->pmp_link)
3970 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3971 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
580b2102
TH		 3972
3973 /* scan for new ones */
1ae46317 3974 ata_scsi_scan_host(ap, 0);
580b2102 3975
ad72cf98 3976 mutex_unlock(&ap->scsi_scan_mutex);
580b2102
TH		 3977 DPRINTK("EXIT\n");
3978}
83c47bcb
TH		 3979
3980/**
3981 * ata_scsi_user_scan - indication for user-initiated bus scan
3982 * @shost: SCSI host to scan
3983 * @channel: Channel to scan
3984 * @id: ID to scan
3985 * @lun: LUN to scan
3986 *
3987 * This function is called when user explicitly requests bus
3988 * scan. Set probe pending flag and invoke EH.
3989 *
3990 * LOCKING:
3991 * SCSI layer (we don't care)
3992 *
3993 * RETURNS:
3994 * Zero.
3995 */
d9027470 3996int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
9cb78c16 3997 unsigned int id, u64 lun)
83c47bcb
TH		 3998{
3999 struct ata_port *ap = ata_shost_to_port(shost);
4000 unsigned long flags;
41bda9c9 4001 int devno, rc = 0;
83c47bcb
TH		 4002
4003 if (!ap->ops->error_handler)
4004 return -EOPNOTSUPP;
4005
41bda9c9 4006 if (lun != SCAN_WILD_CARD && lun)
83c47bcb
TH		 4007 return -EINVAL;
4008
071f44b1 4009 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 4010 if (channel != SCAN_WILD_CARD && channel)
4011 return -EINVAL;
4012 devno = id;
4013 } else {
4014 if (id != SCAN_WILD_CARD && id)
4015 return -EINVAL;
4016 devno = channel;
4017 }
4018
ba6a1308 4019 spin_lock_irqsave(ap->lock, flags);
83c47bcb 4020
41bda9c9
TH		 4021 if (devno == SCAN_WILD_CARD) {
4022 struct ata_link *link;
4023
1eca4365 4024 ata_for_each_link(link, ap, EDGE) {
41bda9c9 4025 struct ata_eh_info *ehi = &link->eh_info;
b558eddd 4026 ehi->probe_mask |= ATA_ALL_DEVICES;
cf480626 4027 ehi->action |= ATA_EH_RESET;
41bda9c9 4028 }
83c47bcb 4029 } else {
41bda9c9 4030 struct ata_device *dev = ata_find_dev(ap, devno);
83c47bcb
TH		 4031
4032 if (dev) {
41bda9c9 4033 struct ata_eh_info *ehi = &dev->link->eh_info;
9af5c9c9 4034 ehi->probe_mask |= 1 << dev->devno;
cf480626 4035 ehi->action |= ATA_EH_RESET;
83c47bcb
TH		 4036 } else
4037 rc = -EINVAL;
4038 }
4039
309afcb5 4040 if (rc == 0) {
83c47bcb 4041 ata_port_schedule_eh(ap);
309afcb5
TH		 4042 spin_unlock_irqrestore(ap->lock, flags);
4043 ata_port_wait_eh(ap);
4044 } else
4045 spin_unlock_irqrestore(ap->lock, flags);
83c47bcb
TH		 4046
4047 return rc;
4048}
3057ac3c 4049
4050/**
d0171269 4051 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
65f27f38 4052 * @work: Pointer to ATA port to perform scsi_rescan_device()
3057ac3c 4053 *
d0171269 4054 * After ATA pass thru (SAT) commands are executed successfully,
ad72cf98 4055 * libata need to propagate the changes to SCSI layer.
3057ac3c 4056 *
d0171269
TH		 4057 * LOCKING:
4058 * Kernel thread context (may sleep).
3057ac3c 4059 */
65f27f38 4060void ata_scsi_dev_rescan(struct work_struct *work)
3057ac3c 4061{
65f27f38
DH		 4062 struct ata_port *ap =
4063 container_of(work, struct ata_port, scsi_rescan_task);
41bda9c9 4064 struct ata_link *link;
f58229f8 4065 struct ata_device *dev;
f84e7e41 4066 unsigned long flags;
3057ac3c 4067
ad72cf98 4068 mutex_lock(&ap->scsi_scan_mutex);
f84e7e41
TH		 4069 spin_lock_irqsave(ap->lock, flags);
4070
1eca4365
TH		 4071 ata_for_each_link(link, ap, EDGE) {
4072 ata_for_each_dev(dev, link, ENABLED) {
41bda9c9 4073 struct scsi_device *sdev = dev->sdev;
3057ac3c 4074
1eca4365 4075 if (!sdev)
41bda9c9
TH		 4076 continue;
4077 if (scsi_device_get(sdev))
4078 continue;
f84e7e41 4079
41bda9c9
TH		 4080 spin_unlock_irqrestore(ap->lock, flags);
4081 scsi_rescan_device(&(sdev->sdev_gendev));
4082 scsi_device_put(sdev);
4083 spin_lock_irqsave(ap->lock, flags);
4084 }
3057ac3c 4085 }
f84e7e41
TH		 4086
4087 spin_unlock_irqrestore(ap->lock, flags);
ad72cf98 4088 mutex_unlock(&ap->scsi_scan_mutex);
3057ac3c 4089}
80289167
BK		 4090
4091/**
4092 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
4f931374 4093 * @host: ATA host container for all SAS ports
80289167 4094 * @port_info: Information from low-level host driver
cca3974e 4095 * @shost: SCSI host that the scsi device is attached to
80289167
BK		 4096 *
4097 * LOCKING:
4098 * PCI/etc. bus probe sem.
4099 *
4100 * RETURNS:
4101 * ata_port pointer on success / NULL on failure.
4102 */
4103
cca3974e 4104struct ata_port *ata_sas_port_alloc(struct ata_host *host,
80289167 4105 struct ata_port_info *port_info,
cca3974e 4106 struct Scsi_Host *shost)
80289167 4107{
f3187195 4108 struct ata_port *ap;
80289167 4109
f3187195 4110 ap = ata_port_alloc(host);
80289167
BK		 4111 if (!ap)
4112 return NULL;
4113
f3187195 4114 ap->port_no = 0;
a29b5dad 4115 ap->lock = &host->lock;
f3187195
TH		 4116 ap->pio_mask = port_info->pio_mask;
4117 ap->mwdma_mask = port_info->mwdma_mask;
4118 ap->udma_mask = port_info->udma_mask;
4119 ap->flags |= port_info->flags;
4120 ap->ops = port_info->port_ops;
4121 ap->cbl = ATA_CBL_SATA;
4122
80289167
BK		 4123 return ap;
4124}
4125EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
4126
4127/**
4128 * ata_sas_port_start - Set port up for dma.
4129 * @ap: Port to initialize
4130 *
4131 * Called just after data structures for each port are
dde20207 4132 * initialized.
80289167
BK		 4133 *
4134 * May be used as the port_start() entry in ata_port_operations.
4135 *
4136 * LOCKING:
4137 * Inherited from caller.
4138 */
4139int ata_sas_port_start(struct ata_port *ap)
4140{
3f1e046a
NA		 4141 /*
4142 * the port is marked as frozen at allocation time, but if we don't
4143 * have new eh, we won't thaw it
4144 */
4145 if (!ap->ops->error_handler)
4146 ap->pflags &= ~ATA_PFLAG_FROZEN;
dde20207 4147 return 0;
80289167
BK		 4148}
4149EXPORT_SYMBOL_GPL(ata_sas_port_start);
4150
4151/**
4152 * ata_port_stop - Undo ata_sas_port_start()
4153 * @ap: Port to shut down
4154 *
80289167
BK		 4155 * May be used as the port_stop() entry in ata_port_operations.
4156 *
4157 * LOCKING:
4158 * Inherited from caller.
4159 */
4160
4161void ata_sas_port_stop(struct ata_port *ap)
4162{
80289167
BK		 4163}
4164EXPORT_SYMBOL_GPL(ata_sas_port_stop);
4165
b2024459
DW		 4166/**
4167 * ata_sas_async_probe - simply schedule probing and return
4168 * @ap: Port to probe
4169 *
4170 * For batch scheduling of probe for sas attached ata devices, assumes
4171 * the port has already been through ata_sas_port_init()
4172 */
4173void ata_sas_async_probe(struct ata_port *ap)
9508a66f 4174{
b2024459
DW		 4175 __ata_port_probe(ap);
4176}
4177EXPORT_SYMBOL_GPL(ata_sas_async_probe);
9508a66f 4178
b2024459
DW		 4179int ata_sas_sync_probe(struct ata_port *ap)
4180{
4181 return ata_port_probe(ap);
9508a66f 4182}
b2024459
DW		 4183EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
4184
9508a66f 4185
80289167
BK		 4186/**
4187 * ata_sas_port_init - Initialize a SATA device
4188 * @ap: SATA port to initialize
4189 *
4190 * LOCKING:
4191 * PCI/etc. bus probe sem.
4192 *
4193 * RETURNS:
4194 * Zero on success, non-zero on error.
4195 */
4196
4197int ata_sas_port_init(struct ata_port *ap)
4198{
4199 int rc = ap->ops->port_start(ap);
4200
b2024459
DW		 4201 if (rc)
4202 return rc;
4203 ap->print_id = atomic_inc_return(&ata_print_id);
4204 return 0;
80289167
BK		 4205}
4206EXPORT_SYMBOL_GPL(ata_sas_port_init);
4207
4208/**
4209 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
4210 * @ap: SATA port to destroy
4211 *
4212 */
4213
4214void ata_sas_port_destroy(struct ata_port *ap)
4215{
f0d36efd
TH		 4216 if (ap->ops->port_stop)
4217 ap->ops->port_stop(ap);
80289167
BK		 4218 kfree(ap);
4219}
4220EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
4221
4222/**
4223 * ata_sas_slave_configure - Default slave_config routine for libata devices
4224 * @sdev: SCSI device to configure
4225 * @ap: ATA port to which SCSI device is attached
4226 *
4227 * RETURNS:
4228 * Zero.
4229 */
4230
4231int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
4232{
4233 ata_scsi_sdev_config(sdev);
9af5c9c9 4234 ata_scsi_dev_config(sdev, ap->link.device);
80289167
BK		 4235 return 0;
4236}
4237EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
4238
4239/**
4240 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
4241 * @cmd: SCSI command to be sent
80289167
BK		 4242 * @ap: ATA port to which the command is being sent
4243 *
4244 * RETURNS:
08475a19
BK		 4245 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4246 * 0 otherwise.
80289167
BK		 4247 */
4248
b27dcfb0 4249int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
80289167 4250{
08475a19
BK		 4251 int rc = 0;
4252
80289167
BK		 4253 ata_scsi_dump_cdb(ap, cmd);
4254
2486fa56 4255 if (likely(ata_dev_enabled(ap->link.device)))
b27dcfb0 4256 rc = __ata_scsi_queuecmd(cmd, ap->link.device);
80289167
BK		 4257 else {
4258 cmd->result = (DID_BAD_TARGET << 16);
b27dcfb0 4259 cmd->scsi_done(cmd);
80289167 4260 }
08475a19 4261 return rc;
80289167
BK		 4262}
4263EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
98bd4be1
SL		 4264
4265int ata_sas_allocate_tag(struct ata_port *ap)
4266{
4267 unsigned int max_queue = ap->host->n_tags;
4268 unsigned int i, tag;
4269
4270 for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) {
3a028243 4271 tag = tag < max_queue ? tag : 0;
98bd4be1
SL		 4272
4273 /* the last tag is reserved for internal command. */
4274 if (tag == ATA_TAG_INTERNAL)
4275 continue;
4276
4277 if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) {
4278 ap->sas_last_tag = tag;
4279 return tag;
4280 }
4281 }
4282 return -1;
4283}
4284
4285void ata_sas_free_tag(unsigned int tag, struct ata_port *ap)
4286{
4287 clear_bit(tag, &ap->sas_tag_allocated);
4288}
Linux kernel - Deliverables
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