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libata: fix unbalanced spin_lock_irqsave/spin_unlock_irq() in ata_scsi_park_show()
[linux-2.6-block.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;
3948b6f2 177 unsigned long now;
45fabbb7
EO		 178 unsigned int uninitialized_var(msecs);
179 int rc = 0;
180
181 ap = ata_shost_to_port(sdev->host);
182
3948b6f2 183 spin_lock_irq(ap->lock);
45fabbb7
EO		 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{
287e6611
AB		 678 unsigned long val;
679 int rc = -EINVAL;
e3cf95dd 680 unsigned long flags;
1da177e4 681
1da177e4 682 switch (cmd) {
287e6611 683 case HDIO_GET_32BIT:
e3cf95dd
AC		 684 spin_lock_irqsave(ap->lock, flags);
685 val = ata_ioc32(ap);
686 spin_unlock_irqrestore(ap->lock, flags);
287e6611 687 return put_user(val, (unsigned long __user *)arg);
1da177e4 688
287e6611 689 case HDIO_SET_32BIT:
1da177e4 690 val = (unsigned long) arg;
e3cf95dd
AC		 691 rc = 0;
692 spin_lock_irqsave(ap->lock, flags);
693 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
694 if (val)
695 ap->pflags |= ATA_PFLAG_PIO32;
696 else
697 ap->pflags &= ~ATA_PFLAG_PIO32;
698 } else {
699 if (val != ata_ioc32(ap))
700 rc = -EINVAL;
701 }
702 spin_unlock_irqrestore(ap->lock, flags);
703 return rc;
1da177e4 704
5924b74c 705 case HDIO_GET_IDENTITY:
94be9a58 706 return ata_get_identity(ap, scsidev, arg);
5924b74c 707
b095518e
JG		 708 case HDIO_DRIVE_CMD:
709 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
710 return -EACCES;
711 return ata_cmd_ioctl(scsidev, arg);
712
713 case HDIO_DRIVE_TASK:
714 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
715 return -EACCES;
716 return ata_task_ioctl(scsidev, arg);
717
1da177e4
LT		 718 default:
719 rc = -ENOTTY;
720 break;
721 }
722
1da177e4
LT		 723 return rc;
724}
94be9a58
JG		 725EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
726
727int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
728{
729 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
730 scsidev, cmd, arg);
731}
732EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
1da177e4
LT		 733
734/**
735 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
1da177e4
LT		 736 * @dev: ATA device to which the new command is attached
737 * @cmd: SCSI command that originated this ATA command
1da177e4
LT		 738 *
739 * Obtain a reference to an unused ata_queued_cmd structure,
740 * which is the basic libata structure representing a single
741 * ATA command sent to the hardware.
742 *
743 * If a command was available, fill in the SCSI-specific
744 * portions of the structure with information on the
745 * current command.
746 *
747 * LOCKING:
cca3974e 748 * spin_lock_irqsave(host lock)
1da177e4
LT		 749 *
750 * RETURNS:
751 * Command allocated, or %NULL if none available.
752 */
7102d230 753static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
b27dcfb0 754 struct scsi_cmnd *cmd)
1da177e4
LT		 755{
756 struct ata_queued_cmd *qc;
757
12cb5ce1 758 qc = ata_qc_new_init(dev, cmd->request->tag);
1da177e4
LT		 759 if (qc) {
760 qc->scsicmd = cmd;
b27dcfb0 761 qc->scsidone = cmd->scsi_done;
1da177e4 762
ff2aeb1e 763 qc->sg = scsi_sglist(cmd);
7120165c 764 qc->n_elem = scsi_sg_count(cmd);
1da177e4
LT		 765 } else {
766 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
b27dcfb0 767 cmd->scsi_done(cmd);
1da177e4
LT		 768 }
769
770 return qc;
771}
772
aacda375
TH		 773static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
774{
775 struct scsi_cmnd *scmd = qc->scsicmd;
776
777 qc->extrabytes = scmd->request->extra_len;
778 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
779}
780
b095518e
JG		 781/**
782 * ata_dump_status - user friendly display of error info
783 * @id: id of the port in question
784 * @tf: ptr to filled out taskfile
785 *
786 * Decode and dump the ATA error/status registers for the user so
787 * that they have some idea what really happened at the non
788 * make-believe layer.
789 *
790 * LOCKING:
791 * inherited from caller
792 */
7102d230 793static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
b095518e
JG		 794{
795 u8 stat = tf->command, err = tf->feature;
796
797 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
798 if (stat & ATA_BUSY) {
799 printk("Busy }\n"); /* Data is not valid in this case */
800 } else {
1308d7f0
HR		 801 if (stat & ATA_DRDY) printk("DriveReady ");
802 if (stat & ATA_DF) printk("DeviceFault ");
803 if (stat & ATA_DSC) printk("SeekComplete ");
804 if (stat & ATA_DRQ) printk("DataRequest ");
805 if (stat & ATA_CORR) printk("CorrectedError ");
806 if (stat & ATA_SENSE) printk("Sense ");
807 if (stat & ATA_ERR) printk("Error ");
b095518e
JG		 808 printk("}\n");
809
810 if (err) {
811 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
1308d7f0
HR		 812 if (err & ATA_ABORTED) printk("DriveStatusError ");
813 if (err & ATA_ICRC) {
814 if (err & ATA_ABORTED)
815 printk("BadCRC ");
b095518e
JG		 816 else printk("Sector ");
817 }
1308d7f0
HR		 818 if (err & ATA_UNC) printk("UncorrectableError ");
819 if (err & ATA_IDNF) printk("SectorIdNotFound ");
820 if (err & ATA_TRK0NF) printk("TrackZeroNotFound ");
821 if (err & ATA_AMNF) printk("AddrMarkNotFound ");
b095518e
JG		 822 printk("}\n");
823 }
824 }
825}
826
1da177e4
LT		 827/**
828 * ata_to_sense_error - convert ATA error to SCSI error
8e8b77dd 829 * @id: ATA device number
1da177e4 830 * @drv_stat: value contained in ATA status register
b095518e
JG		 831 * @drv_err: value contained in ATA error register
832 * @sk: the sense key we'll fill out
833 * @asc: the additional sense code we'll fill out
834 * @ascq: the additional sense code qualifier we'll fill out
246619da 835 * @verbose: be verbose
1da177e4 836 *
b095518e
JG		 837 * Converts an ATA error into a SCSI error. Fill out pointers to
838 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
839 * format sense blocks.
1da177e4
LT		 840 *
841 * LOCKING:
cca3974e 842 * spin_lock_irqsave(host lock)
1da177e4 843 */
7102d230
AB		 844static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
845 u8 *asc, u8 *ascq, int verbose)
1da177e4 846{
b095518e 847 int i;
ffe75ef6 848
1da177e4 849 /* Based on the 3ware driver translation table */
98ac62de 850 static const unsigned char sense_table[][4] = {
1da177e4 851 /* BBD|ECC|ID|MAR */
8ae72044
HR		 852 {0xd1, ABORTED_COMMAND, 0x00, 0x00},
853 // Device busy Aborted command
1da177e4 854 /* BBD|ECC|ID */
8ae72044
HR		 855 {0xd0, ABORTED_COMMAND, 0x00, 0x00},
856 // Device busy Aborted command
1da177e4 857 /* ECC|MC|MARK */
8ae72044
HR		 858 {0x61, HARDWARE_ERROR, 0x00, 0x00},
859 // Device fault Hardware error
1da177e4 860 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
8ae72044
HR		 861 {0x84, ABORTED_COMMAND, 0x47, 0x00},
862 // Data CRC error SCSI parity error
1da177e4 863 /* MC|ID|ABRT|TRK0|MARK */
8ae72044
HR		 864 {0x37, NOT_READY, 0x04, 0x00},
865 // Unit offline Not ready
1da177e4 866 /* MCR|MARK */
8ae72044
HR		 867 {0x09, NOT_READY, 0x04, 0x00},
868 // Unrecovered disk error Not ready
1da177e4 869 /* Bad address mark */
8ae72044
HR		 870 {0x01, MEDIUM_ERROR, 0x13, 0x00},
871 // Address mark not found for data field
872 /* TRK0 - Track 0 not found */
873 {0x02, HARDWARE_ERROR, 0x00, 0x00},
874 // Hardware error
78062c50 875 /* Abort: 0x04 is not translated here, see below */
1da177e4 876 /* Media change request */
8ae72044
HR		 877 {0x08, NOT_READY, 0x04, 0x00},
878 // FIXME: faking offline
879 /* SRV/IDNF - ID not found */
880 {0x10, ILLEGAL_REQUEST, 0x21, 0x00},
881 // Logical address out of range
882 /* MC - Media Changed */
883 {0x20, UNIT_ATTENTION, 0x28, 0x00},
884 // Not ready to ready change, medium may have changed
885 /* ECC - Uncorrectable ECC error */
886 {0x40, MEDIUM_ERROR, 0x11, 0x04},
887 // Unrecovered read error
1da177e4 888 /* BBD - block marked bad */
8ae72044
HR		 889 {0x80, MEDIUM_ERROR, 0x11, 0x04},
890 // Block marked bad Medium error, unrecovered read error
1da177e4
LT		 891 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
892 };
98ac62de 893 static const unsigned char stat_table[][4] = {
1da177e4 894 /* Must be first because BUSY means no other bits valid */
8ae72044
HR		 895 {0x80, ABORTED_COMMAND, 0x47, 0x00},
896 // Busy, fake parity for now
897 {0x40, ILLEGAL_REQUEST, 0x21, 0x04},
898 // Device ready, unaligned write command
899 {0x20, HARDWARE_ERROR, 0x44, 0x00},
900 // Device fault, internal target failure
901 {0x08, ABORTED_COMMAND, 0x47, 0x00},
902 // Timed out in xfer, fake parity for now
903 {0x04, RECOVERED_ERROR, 0x11, 0x00},
904 // Recovered ECC error Medium error, recovered
1da177e4
LT		 905 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
906 };
1da177e4 907
1da177e4
LT		 908 /*
909 * Is this an error we can process/parse
910 */
b095518e
JG		 911 if (drv_stat & ATA_BUSY) {
912 drv_err = 0; /* Ignore the err bits, they're invalid */
1da177e4 913 }
b095518e
JG		 914
915 if (drv_err) {
916 /* Look for drv_err */
917 for (i = 0; sense_table[i][0] != 0xFF; i++) {
918 /* Look for best matches first */
2e9edbf8 919 if ((sense_table[i][0] & drv_err) ==
b095518e
JG		 920 sense_table[i][0]) {
921 *sk = sense_table[i][1];
922 *asc = sense_table[i][2];
923 *ascq = sense_table[i][3];
924 goto translate_done;
925 }
926 }
1da177e4 927 }
b095518e 928
78062c50
GG		 929 /*
930 * Fall back to interpreting status bits. Note that if the drv_err
931 * has only the ABRT bit set, we decode drv_stat. ABRT by itself
932 * is not descriptive enough.
933 */
b095518e
JG		 934 for (i = 0; stat_table[i][0] != 0xFF; i++) {
935 if (stat_table[i][0] & drv_stat) {
936 *sk = stat_table[i][1];
937 *asc = stat_table[i][2];
938 *ascq = stat_table[i][3];
939 goto translate_done;
1da177e4 940 }
b095518e 941 }
b095518e 942
78062c50
GG		 943 /*
944 * We need a sensible error return here, which is tricky, and one
945 * that won't cause people to do things like return a disk wrongly.
946 */
2d202024
AC		 947 *sk = ABORTED_COMMAND;
948 *asc = 0x00;
949 *ascq = 0x00;
b095518e
JG		 950
951 translate_done:
246619da
TH		 952 if (verbose)
953 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
954 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
955 id, drv_stat, drv_err, *sk, *asc, *ascq);
b095518e
JG		 956 return;
957}
958
959/*
750426aa 960 * ata_gen_passthru_sense - Generate check condition sense block.
b095518e
JG		 961 * @qc: Command that completed.
962 *
963 * This function is specific to the ATA descriptor format sense
964 * block specified for the ATA pass through commands. Regardless
965 * of whether the command errored or not, return a sense
966 * block. Copy all controller registers into the sense
84a9a8cd
GG		 967 * block. If there was no error, we get the request from an ATA
968 * passthrough command, so we use the following sense data:
969 * sk = RECOVERED ERROR
970 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
971 *
b095518e
JG		 972 *
973 * LOCKING:
750426aa 974 * None.
b095518e 975 */
750426aa 976static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
b095518e
JG		 977{
978 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 979 struct ata_taskfile *tf = &qc->result_tf;
b095518e
JG		 980 unsigned char *sb = cmd->sense_buffer;
981 unsigned char *desc = sb + 8;
246619da 982 int verbose = qc->ap->ops->error_handler == NULL;
b095518e
JG		 983
984 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
985
0e5dec47 986 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 987
b095518e
JG		 988 /*
989 * Use ata_to_sense_error() to map status register bits
990 * onto sense key, asc & ascq.
991 */
058e55e1
TH		 992 if (qc->err_mask ||
993 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
44877b4e 994 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
246619da 995 &sb[1], &sb[2], &sb[3], verbose);
b095518e 996 sb[1] &= 0x0f;
84a9a8cd
GG		 997 } else {
998 sb[1] = RECOVERED_ERROR;
999 sb[2] = 0;
1000 sb[3] = 0x1D;
1da177e4
LT		 1001 }
1002
b095518e
JG		 1003 /*
1004 * Sense data is current and format is descriptor.
1005 */
1006 sb[0] = 0x72;
1da177e4 1007
b095518e
JG		 1008 desc[0] = 0x09;
1009
f38621b3
TH		 1010 /* set length of additional sense data */
1011 sb[7] = 14;
1012 desc[1] = 12;
b095518e
JG		 1013
1014 /*
1015 * Copy registers into sense buffer.
1016 */
1017 desc[2] = 0x00;
1018 desc[3] = tf->feature; /* == error reg */
1019 desc[5] = tf->nsect;
1020 desc[7] = tf->lbal;
1021 desc[9] = tf->lbam;
1022 desc[11] = tf->lbah;
1023 desc[12] = tf->device;
1024 desc[13] = tf->command; /* == status reg */
1025
1026 /*
1027 * Fill in Extend bit, and the high order bytes
1028 * if applicable.
1029 */
1030 if (tf->flags & ATA_TFLAG_LBA48) {
1031 desc[2] |= 0x01;
1032 desc[4] = tf->hob_nsect;
1033 desc[6] = tf->hob_lbal;
1034 desc[8] = tf->hob_lbam;
1035 desc[10] = tf->hob_lbah;
1da177e4 1036 }
b095518e 1037}
1da177e4 1038
b095518e 1039/**
750426aa 1040 * ata_gen_ata_sense - generate a SCSI fixed sense block
b095518e
JG		 1041 * @qc: Command that we are erroring out
1042 *
d25614ba 1043 * Generate sense block for a failed ATA command @qc. Descriptor
25985edc 1044 * format is used to accommodate LBA48 block address.
b095518e
JG		 1045 *
1046 * LOCKING:
750426aa 1047 * None.
b095518e 1048 */
750426aa 1049static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
b095518e 1050{
d25614ba 1051 struct ata_device *dev = qc->dev;
b095518e 1052 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 1053 struct ata_taskfile *tf = &qc->result_tf;
b095518e 1054 unsigned char *sb = cmd->sense_buffer;
d25614ba 1055 unsigned char *desc = sb + 8;
246619da 1056 int verbose = qc->ap->ops->error_handler == NULL;
d25614ba 1057 u64 block;
b095518e
JG		 1058
1059 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1060
0e5dec47 1061 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 1062
d25614ba
TH		 1063 /* sense data is current and format is descriptor */
1064 sb[0] = 0x72;
1065
1066 /* Use ata_to_sense_error() to map status register bits
b095518e
JG		 1067 * onto sense key, asc & ascq.
1068 */
058e55e1
TH		 1069 if (qc->err_mask ||
1070 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
44877b4e 1071 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
d25614ba
TH		 1072 &sb[1], &sb[2], &sb[3], verbose);
1073 sb[1] &= 0x0f;
1da177e4 1074 }
1da177e4 1075
d25614ba 1076 block = ata_tf_read_block(&qc->result_tf, dev);
a7dac447 1077
d25614ba
TH		 1078 /* information sense data descriptor */
1079 sb[7] = 12;
1080 desc[0] = 0x00;
1081 desc[1] = 10;
a7dac447 1082
d25614ba
TH		 1083 desc[2] |= 0x80; /* valid */
1084 desc[6] = block >> 40;
1085 desc[7] = block >> 32;
1086 desc[8] = block >> 24;
1087 desc[9] = block >> 16;
1088 desc[10] = block >> 8;
1089 desc[11] = block;
1da177e4
LT		 1090}
1091
a6cce2a7
BK		 1092static void ata_scsi_sdev_config(struct scsi_device *sdev)
1093{
1094 sdev->use_10_for_rw = 1;
1095 sdev->use_10_for_ms = 1;
3c6bdaea 1096 sdev->no_report_opcodes = 1;
5db44863 1097 sdev->no_write_same = 1;
31cc23b3
TH		 1098
1099 /* Schedule policy is determined by ->qc_defer() callback and
1100 * it needs to see every deferred qc. Set dev_blocked to 1 to
1101 * prevent SCSI midlayer from automatically deferring
1102 * requests.
1103 */
1104 sdev->max_device_blocked = 1;
a6cce2a7
BK		 1105}
1106
fa2fc7f4
JB		 1107/**
1108 * atapi_drain_needed - Check whether data transfer may overflow
73fd8b6d 1109 * @rq: request to be checked
fa2fc7f4
JB		 1110 *
1111 * ATAPI commands which transfer variable length data to host
1112 * might overflow due to application error or hardare bug. This
1113 * function checks whether overflow should be drained and ignored
1114 * for @request.
1115 *
1116 * LOCKING:
1117 * None.
1118 *
1119 * RETURNS:
1120 * 1 if ; otherwise, 0.
1121 */
1122static int atapi_drain_needed(struct request *rq)
1123{
33659ebb 1124 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
fa2fc7f4
JB		 1125 return 0;
1126
7b6d91da 1127 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
fa2fc7f4
JB		 1128 return 0;
1129
1130 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1131}
1132
1133static int ata_scsi_dev_config(struct scsi_device *sdev,
1134 struct ata_device *dev)
a6cce2a7 1135{
900e599e 1136 struct request_queue *q = sdev->request_queue;
1137
45fabbb7
EO		 1138 if (!ata_id_has_unload(dev->id))
1139 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1140
914ed354 1141 /* configure max sectors */
900e599e 1142 blk_queue_max_hw_sectors(q, dev->max_sectors);
a6cce2a7 1143
fa2fc7f4 1144 if (dev->class == ATA_DEV_ATAPI) {
fa2fc7f4
JB		 1145 void *buf;
1146
729a6a30
TH		 1147 sdev->sector_size = ATA_SECT_SIZE;
1148
1149 /* set DMA padding */
900e599e 1150 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
fa2fc7f4
JB		 1151
1152 /* configure draining */
1153 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1154 if (!buf) {
a9a79dfe 1155 ata_dev_err(dev, "drain buffer allocation failed\n");
fa2fc7f4
JB		 1156 return -ENOMEM;
1157 }
1158
1159 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1160 } else {
295124dc 1161 sdev->sector_size = ata_id_logical_sector_size(dev->id);
d8cf5389 1162 sdev->manage_start_stop = 1;
dde20207 1163 }
d8cf5389 1164
729a6a30
TH		 1165 /*
1166 * ata_pio_sectors() expects buffer for each sector to not cross
1167 * page boundary. Enforce it by requiring buffers to be sector
1168 * aligned, which works iff sector_size is not larger than
1169 * PAGE_SIZE. ATAPI devices also need the alignment as
1170 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1171 */
1172 if (sdev->sector_size > PAGE_SIZE)
a9a79dfe 1173 ata_dev_warn(dev,
729a6a30
TH		 1174 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1175 sdev->sector_size);
1176
900e599e 1177 blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
729a6a30 1178
f26792d5
JG		 1179 if (dev->flags & ATA_DFLAG_AN)
1180 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1181
a6e6ce8e
TH		 1182 if (dev->flags & ATA_DFLAG_NCQ) {
1183 int depth;
1184
1185 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1186 depth = min(ATA_MAX_QUEUE - 1, depth);
db5ed4df 1187 scsi_change_queue_depth(sdev, depth);
a6e6ce8e 1188 }
fa2fc7f4 1189
900e599e 1190 blk_queue_flush_queueable(q, false);
1191
295124dc 1192 dev->sdev = sdev;
fa2fc7f4 1193 return 0;
a6cce2a7
BK		 1194}
1195
1da177e4
LT		 1196/**
1197 * ata_scsi_slave_config - Set SCSI device attributes
1198 * @sdev: SCSI device to examine
1199 *
1200 * This is called before we actually start reading
1201 * and writing to the device, to configure certain
1202 * SCSI mid-layer behaviors.
1203 *
1204 * LOCKING:
1205 * Defined by SCSI layer. We don't really care.
1206 */
1207
1208int ata_scsi_slave_config(struct scsi_device *sdev)
1209{
31534363
TH		 1210 struct ata_port *ap = ata_shost_to_port(sdev->host);
1211 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
fa2fc7f4 1212 int rc = 0;
31534363 1213
a6cce2a7 1214 ata_scsi_sdev_config(sdev);
1da177e4 1215
31534363 1216 if (dev)
fa2fc7f4 1217 rc = ata_scsi_dev_config(sdev, dev);
1da177e4 1218
fa2fc7f4 1219 return rc;
1da177e4
LT		 1220}
1221
83c47bcb
TH		 1222/**
1223 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1224 * @sdev: SCSI device to be destroyed
1225 *
1226 * @sdev is about to be destroyed for hot/warm unplugging. If
1227 * this unplugging was initiated by libata as indicated by NULL
1228 * dev->sdev, this function doesn't have to do anything.
1229 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1230 * Clear dev->sdev, schedule the device for ATA detach and invoke
1231 * EH.
1232 *
1233 * LOCKING:
1234 * Defined by SCSI layer. We don't really care.
1235 */
1236void ata_scsi_slave_destroy(struct scsi_device *sdev)
1237{
1238 struct ata_port *ap = ata_shost_to_port(sdev->host);
fa2fc7f4 1239 struct request_queue *q = sdev->request_queue;
83c47bcb
TH		 1240 unsigned long flags;
1241 struct ata_device *dev;
1242
1243 if (!ap->ops->error_handler)
1244 return;
1245
ba6a1308 1246 spin_lock_irqsave(ap->lock, flags);
83c47bcb
TH		 1247 dev = __ata_scsi_find_dev(ap, sdev);
1248 if (dev && dev->sdev) {
1249 /* SCSI device already in CANCEL state, no need to offline it */
1250 dev->sdev = NULL;
1251 dev->flags |= ATA_DFLAG_DETACH;
1252 ata_port_schedule_eh(ap);
1253 }
ba6a1308 1254 spin_unlock_irqrestore(ap->lock, flags);
fa2fc7f4
JB		 1255
1256 kfree(q->dma_drain_buffer);
1257 q->dma_drain_buffer = NULL;
1258 q->dma_drain_size = 0;
83c47bcb
TH		 1259}
1260
a6e6ce8e 1261/**
f6e67035 1262 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
6d2dd054
MPS		 1263 * @ap: ATA port to which the device change the queue depth
1264 * @sdev: SCSI device to configure queue depth for
1265 * @queue_depth: new queue depth
a6e6ce8e 1266 *
f6e67035
DW		 1267 * libsas and libata have different approaches for associating a sdev to
1268 * its ata_port.
a6e6ce8e 1269 *
a6e6ce8e 1270 */
f6e67035 1271int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
db5ed4df 1272 int queue_depth)
a6e6ce8e 1273{
a6e6ce8e 1274 struct ata_device *dev;
360f654e 1275 unsigned long flags;
a6e6ce8e 1276
c3c70c44 1277 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
a6e6ce8e
TH		 1278 return sdev->queue_depth;
1279
1280 dev = ata_scsi_find_dev(ap, sdev);
1281 if (!dev || !ata_dev_enabled(dev))
1282 return sdev->queue_depth;
1283
c3c70c44 1284 /* NCQ enabled? */
360f654e 1285 spin_lock_irqsave(ap->lock, flags);
c3c70c44
TH		 1286 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1287 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
360f654e 1288 dev->flags |= ATA_DFLAG_NCQ_OFF;
c3c70c44
TH		 1289 queue_depth = 1;
1290 }
360f654e
TH		 1291 spin_unlock_irqrestore(ap->lock, flags);
1292
c3c70c44
TH		 1293 /* limit and apply queue depth */
1294 queue_depth = min(queue_depth, sdev->host->can_queue);
1295 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1296 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1297
1298 if (sdev->queue_depth == queue_depth)
1299 return -EINVAL;
1300
db5ed4df 1301 return scsi_change_queue_depth(sdev, queue_depth);
a6e6ce8e
TH		 1302}
1303
f6e67035
DW		 1304/**
1305 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1306 * @sdev: SCSI device to configure queue depth for
1307 * @queue_depth: new queue depth
f6e67035
DW		 1308 *
1309 * This is libata standard hostt->change_queue_depth callback.
1310 * SCSI will call into this callback when user tries to set queue
1311 * depth via sysfs.
1312 *
1313 * LOCKING:
1314 * SCSI layer (we don't care)
1315 *
1316 * RETURNS:
1317 * Newly configured queue depth.
1318 */
db5ed4df 1319int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
f6e67035
DW		 1320{
1321 struct ata_port *ap = ata_shost_to_port(sdev->host);
1322
db5ed4df 1323 return __ata_change_queue_depth(ap, sdev, queue_depth);
f6e67035
DW		 1324}
1325
972dcafb
DG		 1326/**
1327 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1328 * @qc: Storage for translated ATA taskfile
972dcafb
DG		 1329 *
1330 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1331 * (to start). Perhaps these commands should be preceded by
1332 * CHECK POWER MODE to see what power mode the device is already in.
1333 * [See SAT revision 5 at www.t10.org]
1334 *
1335 * LOCKING:
cca3974e 1336 * spin_lock_irqsave(host lock)
972dcafb
DG		 1337 *
1338 * RETURNS:
1339 * Zero on success, non-zero on error.
1340 */
ad706991 1341static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
972dcafb 1342{
542b1444 1343 struct scsi_cmnd *scmd = qc->scsicmd;
972dcafb 1344 struct ata_taskfile *tf = &qc->tf;
ad706991 1345 const u8 *cdb = scmd->cmnd;
972dcafb 1346
2e5704f6
TH		 1347 if (scmd->cmd_len < 5)
1348 goto invalid_fld;
1349
972dcafb
DG		 1350 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1351 tf->protocol = ATA_PROT_NODATA;
542b1444 1352 if (cdb[1] & 0x1) {
972dcafb
DG		 1353 ; /* ignore IMMED bit, violates sat-r05 */
1354 }
542b1444 1355 if (cdb[4] & 0x2)
ae006510 1356 goto invalid_fld; /* LOEJ bit set not supported */
542b1444 1357 if (((cdb[4] >> 4) & 0xf) != 0)
ae006510 1358 goto invalid_fld; /* power conditions not supported */
e31e8531 1359
542b1444 1360 if (cdb[4] & 0x1) {
972dcafb 1361 tf->nsect = 1; /* 1 sector, lba=0 */
9d5b1302
AL		 1362
1363 if (qc->dev->flags & ATA_DFLAG_LBA) {
c44078c0 1364 tf->flags |= ATA_TFLAG_LBA;
9d5b1302
AL		 1365
1366 tf->lbah = 0x0;
1367 tf->lbam = 0x0;
1368 tf->lbal = 0x0;
1369 tf->device |= ATA_LBA;
1370 } else {
1371 /* CHS */
1372 tf->lbal = 0x1; /* sect */
1373 tf->lbam = 0x0; /* cyl low */
1374 tf->lbah = 0x0; /* cyl high */
1375 }
1376
972dcafb 1377 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
920a4b10 1378 } else {
2a6e58d2
RW		 1379 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1380 * or S5) causing some drives to spin up and down again.
1381 */
1382 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1383 system_state == SYSTEM_POWER_OFF)
1384 goto skip;
1385
1386 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1387 system_entering_hibernation())
1388 goto skip;
1389
78981a7c
RH		 1390 /* Issue ATA STANDBY IMMEDIATE command */
1391 tf->command = ATA_CMD_STANDBYNOW1;
920a4b10 1392 }
78981a7c 1393
972dcafb
DG		 1394 /*
1395 * Standby and Idle condition timers could be implemented but that
1396 * would require libata to implement the Power condition mode page
1397 * and allow the user to change it. Changing mode pages requires
1398 * MODE SELECT to be implemented.
1399 */
1400
1401 return 0;
ae006510 1402
2a6e58d2 1403 invalid_fld:
542b1444 1404 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1405 /* "Invalid field in cbd" */
1406 return 1;
2a6e58d2
RW		 1407 skip:
1408 scmd->result = SAM_STAT_GOOD;
1409 return 1;
972dcafb
DG		 1410}
1411
1412
1da177e4
LT		 1413/**
1414 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1415 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1416 *
1417 * Sets up an ATA taskfile to issue FLUSH CACHE or
1418 * FLUSH CACHE EXT.
1419 *
1420 * LOCKING:
cca3974e 1421 * spin_lock_irqsave(host lock)
1da177e4
LT		 1422 *
1423 * RETURNS:
1424 * Zero on success, non-zero on error.
1425 */
ad706991 1426static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1da177e4
LT		 1427{
1428 struct ata_taskfile *tf = &qc->tf;
1429
1430 tf->flags |= ATA_TFLAG_DEVICE;
1431 tf->protocol = ATA_PROT_NODATA;
1432
6fc49adb 1433 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1da177e4
LT		 1434 tf->command = ATA_CMD_FLUSH_EXT;
1435 else
1436 tf->command = ATA_CMD_FLUSH;
1437
b666da35
TH		 1438 /* flush is critical for IO integrity, consider it an IO command */
1439 qc->flags |= ATA_QCFLAG_IO;
1440
1da177e4
LT		 1441 return 0;
1442}
1443
3aef5231
AL		 1444/**
1445 * scsi_6_lba_len - Get LBA and transfer length
542b1444 1446 * @cdb: SCSI command to translate
3aef5231
AL		 1447 *
1448 * Calculate LBA and transfer length for 6-byte commands.
1449 *
1450 * RETURNS:
1451 * @plba: the LBA
1452 * @plen: the transfer length
1453 */
542b1444 1454static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1455{
1456 u64 lba = 0;
6c7b7d2b 1457 u32 len;
3aef5231
AL		 1458
1459 VPRINTK("six-byte command\n");
1460
6c7b7d2b 1461 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
542b1444
TH		 1462 lba |= ((u64)cdb[2]) << 8;
1463 lba |= ((u64)cdb[3]);
3aef5231 1464
6c7b7d2b 1465 len = cdb[4];
3aef5231
AL		 1466
1467 *plba = lba;
1468 *plen = len;
1469}
1470
1471/**
1472 * scsi_10_lba_len - Get LBA and transfer length
542b1444 1473 * @cdb: SCSI command to translate
3aef5231
AL		 1474 *
1475 * Calculate LBA and transfer length for 10-byte commands.
1476 *
1477 * RETURNS:
1478 * @plba: the LBA
1479 * @plen: the transfer length
1480 */
542b1444 1481static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1482{
1483 u64 lba = 0;
1484 u32 len = 0;
1485
1486 VPRINTK("ten-byte command\n");
1487
542b1444
TH		 1488 lba |= ((u64)cdb[2]) << 24;
1489 lba |= ((u64)cdb[3]) << 16;
1490 lba |= ((u64)cdb[4]) << 8;
1491 lba |= ((u64)cdb[5]);
3aef5231 1492
542b1444
TH		 1493 len |= ((u32)cdb[7]) << 8;
1494 len |= ((u32)cdb[8]);
3aef5231
AL		 1495
1496 *plba = lba;
1497 *plen = len;
1498}
1499
1500/**
1501 * scsi_16_lba_len - Get LBA and transfer length
542b1444 1502 * @cdb: SCSI command to translate
3aef5231
AL		 1503 *
1504 * Calculate LBA and transfer length for 16-byte commands.
1505 *
1506 * RETURNS:
1507 * @plba: the LBA
1508 * @plen: the transfer length
1509 */
542b1444 1510static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1511{
1512 u64 lba = 0;
1513 u32 len = 0;
1514
1515 VPRINTK("sixteen-byte command\n");
1516
542b1444
TH		 1517 lba |= ((u64)cdb[2]) << 56;
1518 lba |= ((u64)cdb[3]) << 48;
1519 lba |= ((u64)cdb[4]) << 40;
1520 lba |= ((u64)cdb[5]) << 32;
1521 lba |= ((u64)cdb[6]) << 24;
1522 lba |= ((u64)cdb[7]) << 16;
1523 lba |= ((u64)cdb[8]) << 8;
1524 lba |= ((u64)cdb[9]);
3aef5231 1525
542b1444
TH		 1526 len |= ((u32)cdb[10]) << 24;
1527 len |= ((u32)cdb[11]) << 16;
1528 len |= ((u32)cdb[12]) << 8;
1529 len |= ((u32)cdb[13]);
3aef5231
AL		 1530
1531 *plba = lba;
1532 *plen = len;
1533}
1534
1da177e4
LT		 1535/**
1536 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1537 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1538 *
1539 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1540 *
1541 * LOCKING:
cca3974e 1542 * spin_lock_irqsave(host lock)
1da177e4
LT		 1543 *
1544 * RETURNS:
1545 * Zero on success, non-zero on error.
1546 */
ad706991 1547static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1da177e4 1548{
542b1444 1549 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4 1550 struct ata_taskfile *tf = &qc->tf;
8bf62ece 1551 struct ata_device *dev = qc->dev;
1da177e4 1552 u64 dev_sectors = qc->dev->n_sectors;
ad706991 1553 const u8 *cdb = scmd->cmnd;
3aef5231
AL		 1554 u64 block;
1555 u32 n_block;
1da177e4
LT		 1556
1557 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1558 tf->protocol = ATA_PROT_NODATA;
1da177e4 1559
2e5704f6
TH		 1560 if (cdb[0] == VERIFY) {
1561 if (scmd->cmd_len < 10)
1562 goto invalid_fld;
542b1444 1563 scsi_10_lba_len(cdb, &block, &n_block);
2e5704f6
TH		 1564 } else if (cdb[0] == VERIFY_16) {
1565 if (scmd->cmd_len < 16)
1566 goto invalid_fld;
542b1444 1567 scsi_16_lba_len(cdb, &block, &n_block);
2e5704f6 1568 } else
ae006510 1569 goto invalid_fld;
1da177e4 1570
8bf62ece 1571 if (!n_block)
ae006510 1572 goto nothing_to_do;
8bf62ece 1573 if (block >= dev_sectors)
ae006510 1574 goto out_of_range;
8bf62ece 1575 if ((block + n_block) > dev_sectors)
ae006510 1576 goto out_of_range;
1da177e4 1577
07506697
AL		 1578 if (dev->flags & ATA_DFLAG_LBA) {
1579 tf->flags |= ATA_TFLAG_LBA;
1580
c6a33e24
AL		 1581 if (lba_28_ok(block, n_block)) {
1582 /* use LBA28 */
1583 tf->command = ATA_CMD_VERIFY;
1584 tf->device |= (block >> 24) & 0xf;
1585 } else if (lba_48_ok(block, n_block)) {
1586 if (!(dev->flags & ATA_DFLAG_LBA48))
1587 goto out_of_range;
07506697
AL		 1588
1589 /* use LBA48 */
1590 tf->flags |= ATA_TFLAG_LBA48;
8bf62ece 1591 tf->command = ATA_CMD_VERIFY_EXT;
1da177e4 1592
8bf62ece 1593 tf->hob_nsect = (n_block >> 8) & 0xff;
1da177e4 1594
8bf62ece
AL		 1595 tf->hob_lbah = (block >> 40) & 0xff;
1596 tf->hob_lbam = (block >> 32) & 0xff;
1597 tf->hob_lbal = (block >> 24) & 0xff;
c6a33e24
AL		 1598 } else
1599 /* request too large even for LBA48 */
1600 goto out_of_range;
8bf62ece
AL		 1601
1602 tf->nsect = n_block & 0xff;
1da177e4 1603
8bf62ece
AL		 1604 tf->lbah = (block >> 16) & 0xff;
1605 tf->lbam = (block >> 8) & 0xff;
1606 tf->lbal = block & 0xff;
1da177e4 1607
8bf62ece
AL		 1608 tf->device |= ATA_LBA;
1609 } else {
1610 /* CHS */
1611 u32 sect, head, cyl, track;
1612
c6a33e24
AL		 1613 if (!lba_28_ok(block, n_block))
1614 goto out_of_range;
07506697 1615
8bf62ece
AL		 1616 /* Convert LBA to CHS */
1617 track = (u32)block / dev->sectors;
1618 cyl = track / dev->heads;
1619 head = track % dev->heads;
1620 sect = (u32)block % dev->sectors + 1;
1621
c187c4b5
AL		 1622 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1623 (u32)block, track, cyl, head, sect);
2e9edbf8
JG		 1624
1625 /* Check whether the converted CHS can fit.
1626 Cylinder: 0-65535
8bf62ece
AL		 1627 Head: 0-15
1628 Sector: 1-255*/
2e9edbf8 1629 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
ae006510 1630 goto out_of_range;
2e9edbf8 1631
8bf62ece
AL		 1632 tf->command = ATA_CMD_VERIFY;
1633 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1634 tf->lbal = sect;
1635 tf->lbam = cyl;
1636 tf->lbah = cyl >> 8;
1637 tf->device |= head;
1638 }
1da177e4
LT		 1639
1640 return 0;
ae006510
DG		 1641
1642invalid_fld:
542b1444 1643 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1644 /* "Invalid field in cbd" */
1645 return 1;
1646
1647out_of_range:
542b1444 1648 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1649 /* "Logical Block Address out of range" */
1650 return 1;
1651
1652nothing_to_do:
542b1444 1653 scmd->result = SAM_STAT_GOOD;
ae006510 1654 return 1;
1da177e4
LT		 1655}
1656
1657/**
1658 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1659 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1660 *
1661 * Converts any of six SCSI read/write commands into the
1662 * ATA counterpart, including starting sector (LBA),
1663 * sector count, and taking into account the device's LBA48
1664 * support.
1665 *
1666 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1667 * %WRITE_16 are currently supported.
1668 *
1669 * LOCKING:
cca3974e 1670 * spin_lock_irqsave(host lock)
1da177e4
LT		 1671 *
1672 * RETURNS:
1673 * Zero on success, non-zero on error.
1674 */
ad706991 1675static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1da177e4 1676{
542b1444 1677 struct scsi_cmnd *scmd = qc->scsicmd;
ad706991 1678 const u8 *cdb = scmd->cmnd;
bd056d7e 1679 unsigned int tf_flags = 0;
3aef5231
AL		 1680 u64 block;
1681 u32 n_block;
bd056d7e 1682 int rc;
1da177e4 1683
542b1444 1684 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
bd056d7e 1685 tf_flags |= ATA_TFLAG_WRITE;
1da177e4 1686
9a3dccc4 1687 /* Calculate the SCSI LBA, transfer length and FUA. */
542b1444 1688 switch (cdb[0]) {
3aef5231
AL		 1689 case READ_10:
1690 case WRITE_10:
2e5704f6
TH		 1691 if (unlikely(scmd->cmd_len < 10))
1692 goto invalid_fld;
542b1444 1693 scsi_10_lba_len(cdb, &block, &n_block);
3e451a49 1694 if (cdb[1] & (1 << 3))
bd056d7e 1695 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1696 break;
1697 case READ_6:
1698 case WRITE_6:
2e5704f6
TH		 1699 if (unlikely(scmd->cmd_len < 6))
1700 goto invalid_fld;
542b1444 1701 scsi_6_lba_len(cdb, &block, &n_block);
c187c4b5
AL		 1702
1703 /* for 6-byte r/w commands, transfer length 0
1704 * means 256 blocks of data, not 0 block.
1705 */
76b2bf9b
JG		 1706 if (!n_block)
1707 n_block = 256;
3aef5231
AL		 1708 break;
1709 case READ_16:
1710 case WRITE_16:
2e5704f6
TH		 1711 if (unlikely(scmd->cmd_len < 16))
1712 goto invalid_fld;
542b1444 1713 scsi_16_lba_len(cdb, &block, &n_block);
3e451a49 1714 if (cdb[1] & (1 << 3))
bd056d7e 1715 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1716 break;
1717 default:
8bf62ece 1718 DPRINTK("no-byte command\n");
ae006510 1719 goto invalid_fld;
1da177e4
LT		 1720 }
1721
8bf62ece
AL		 1722 /* Check and compose ATA command */
1723 if (!n_block)
c187c4b5
AL		 1724 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1725 * length 0 means transfer 0 block of data.
1726 * However, for ATA R/W commands, sector count 0 means
1727 * 256 or 65536 sectors, not 0 sectors as in SCSI.
f51750d5
AC		 1728 *
1729 * WARNING: one or two older ATA drives treat 0 as 0...
c187c4b5 1730 */
ae006510 1731 goto nothing_to_do;
1da177e4 1732
bd056d7e 1733 qc->flags |= ATA_QCFLAG_IO;
295124dc 1734 qc->nbytes = n_block * scmd->device->sector_size;
1da177e4 1735
bd056d7e
TH		 1736 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1737 qc->tag);
1738 if (likely(rc == 0))
1739 return 0;
ae006510 1740
bd056d7e
TH		 1741 if (rc == -ERANGE)
1742 goto out_of_range;
1743 /* treat all other errors as -EINVAL, fall through */
ae006510 1744invalid_fld:
542b1444 1745 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1746 /* "Invalid field in cbd" */
1747 return 1;
1748
1749out_of_range:
542b1444 1750 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1751 /* "Logical Block Address out of range" */
1752 return 1;
1753
1754nothing_to_do:
542b1444 1755 scmd->result = SAM_STAT_GOOD;
ae006510 1756 return 1;
1da177e4
LT		 1757}
1758
2aa8f5d6
CH		 1759static void ata_qc_done(struct ata_queued_cmd *qc)
1760{
1761 struct scsi_cmnd *cmd = qc->scsicmd;
1762 void (*done)(struct scsi_cmnd *) = qc->scsidone;
1763
1764 ata_qc_free(qc);
1765 done(cmd);
1766}
1767
77853bf2 1768static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1da177e4 1769{
c31f571d 1770 struct ata_port *ap = qc->ap;
1da177e4 1771 struct scsi_cmnd *cmd = qc->scsicmd;
a7dac447 1772 u8 *cdb = cmd->cmnd;
2dcb407e 1773 int need_sense = (qc->err_mask != 0);
b095518e
JG		 1774
1775 /* For ATA pass thru (SAT) commands, generate a sense block if
1776 * user mandated it or if there's an error. Note that if we
84a9a8cd
GG		 1777 * generate because the user forced us to [CK_COND =1], a check
1778 * condition is generated and the ATA register values are returned
b095518e 1779 * whether the command completed successfully or not. If there
84a9a8cd
GG		 1780 * was no error, we use the following sense data:
1781 * sk = RECOVERED ERROR
1782 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
b095518e 1783 */
a7dac447 1784 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
25c7ce7f 1785 ((cdb[2] & 0x20) || need_sense))
750426aa 1786 ata_gen_passthru_sense(qc);
25c7ce7f
CH		 1787 else if (need_sense)
1788 ata_gen_ata_sense(qc);
1789 else
1790 cmd->result = SAM_STAT_GOOD;
1da177e4 1791
c31f571d 1792 if (need_sense && !ap->ops->error_handler)
44877b4e 1793 ata_dump_status(ap->print_id, &qc->result_tf);
1da177e4 1794
2aa8f5d6 1795 ata_qc_done(qc);
1da177e4
LT		 1796}
1797
1798/**
1799 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1da177e4
LT		 1800 * @dev: ATA device to which the command is addressed
1801 * @cmd: SCSI command to execute
1da177e4
LT		 1802 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1803 *
1804 * Our ->queuecommand() function has decided that the SCSI
1805 * command issued can be directly translated into an ATA
1806 * command, rather than handled internally.
1807 *
1808 * This function sets up an ata_queued_cmd structure for the
1809 * SCSI command, and sends that ata_queued_cmd to the hardware.
1810 *
ae006510
DG		 1811 * The xlat_func argument (actor) returns 0 if ready to execute
1812 * ATA command, else 1 to finish translation. If 1 is returned
1813 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1814 * to be set reflecting an error condition or clean (early)
1815 * termination.
1816 *
1da177e4 1817 * LOCKING:
cca3974e 1818 * spin_lock_irqsave(host lock)
2115ea94
TH		 1819 *
1820 * RETURNS:
1821 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1822 * needs to be deferred.
1da177e4 1823 */
2115ea94 1824static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
2115ea94 1825 ata_xlat_func_t xlat_func)
1da177e4 1826{
31cc23b3 1827 struct ata_port *ap = dev->link->ap;
1da177e4 1828 struct ata_queued_cmd *qc;
31cc23b3 1829 int rc;
1da177e4
LT		 1830
1831 VPRINTK("ENTER\n");
1832
b27dcfb0 1833 qc = ata_scsi_qc_new(dev, cmd);
1da177e4 1834 if (!qc)
ae006510 1835 goto err_mem;
1da177e4
LT		 1836
1837 /* data is present; dma-map it */
be7db055 1838 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1839 cmd->sc_data_direction == DMA_TO_DEVICE) {
7120165c 1840 if (unlikely(scsi_bufflen(cmd) < 1)) {
a9a79dfe 1841 ata_dev_warn(dev, "WARNING: zero len r/w req\n");
ae006510 1842 goto err_did;
1da177e4
LT		 1843 }
1844
7120165c 1845 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1da177e4
LT		 1846
1847 qc->dma_dir = cmd->sc_data_direction;
1848 }
1849
1850 qc->complete_fn = ata_scsi_qc_complete;
1851
ad706991 1852 if (xlat_func(qc))
ae006510 1853 goto early_finish;
1da177e4 1854
31cc23b3
TH		 1855 if (ap->ops->qc_defer) {
1856 if ((rc = ap->ops->qc_defer(qc)))
1857 goto defer;
1858 }
1859
1da177e4 1860 /* select device, send command to hardware */
8e0e694a 1861 ata_qc_issue(qc);
1da177e4
LT		 1862
1863 VPRINTK("EXIT\n");
2115ea94 1864 return 0;
1da177e4 1865
ae006510 1866early_finish:
2dcb407e 1867 ata_qc_free(qc);
b27dcfb0 1868 cmd->scsi_done(cmd);
ae006510 1869 DPRINTK("EXIT - early finish (good or error)\n");
2115ea94 1870 return 0;
ae006510
DG		 1871
1872err_did:
1da177e4 1873 ata_qc_free(qc);
ae006510 1874 cmd->result = (DID_ERROR << 16);
b27dcfb0 1875 cmd->scsi_done(cmd);
253b92ec 1876err_mem:
ae006510 1877 DPRINTK("EXIT - internal\n");
2115ea94 1878 return 0;
3dc1d881
TH		 1879
1880defer:
31cc23b3 1881 ata_qc_free(qc);
3dc1d881 1882 DPRINTK("EXIT - defer\n");
31cc23b3
TH		 1883 if (rc == ATA_DEFER_LINK)
1884 return SCSI_MLQUEUE_DEVICE_BUSY;
1885 else
1886 return SCSI_MLQUEUE_HOST_BUSY;
1da177e4
LT		 1887}
1888
1889/**
1890 * ata_scsi_rbuf_get - Map response buffer.
ec2a20e6 1891 * @cmd: SCSI command containing buffer to be mapped.
87340e98
TH		 1892 * @flags: unsigned long variable to store irq enable status
1893 * @copy_in: copy in from user buffer
1da177e4 1894 *
87340e98 1895 * Prepare buffer for simulated SCSI commands.
1da177e4
LT		 1896 *
1897 * LOCKING:
87340e98 1898 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1da177e4
LT		 1899 *
1900 * RETURNS:
87340e98 1901 * Pointer to response buffer.
1da177e4 1902 */
87340e98
TH		 1903static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1904 unsigned long *flags)
1da177e4 1905{
87340e98 1906 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1da177e4 1907
87340e98
TH		 1908 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1909 if (copy_in)
1910 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1911 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1912 return ata_scsi_rbuf;
1da177e4
LT		 1913}
1914
1915/**
1916 * ata_scsi_rbuf_put - Unmap response buffer.
1917 * @cmd: SCSI command containing buffer to be unmapped.
87340e98
TH		 1918 * @copy_out: copy out result
1919 * @flags: @flags passed to ata_scsi_rbuf_get()
1da177e4 1920 *
87340e98
TH		 1921 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1922 * @copy_back is true.
1da177e4
LT		 1923 *
1924 * LOCKING:
87340e98 1925 * Unlocks ata_scsi_rbuf_lock.
1da177e4 1926 */
87340e98
TH		 1927static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1928 unsigned long *flags)
1da177e4 1929{
87340e98
TH		 1930 if (copy_out)
1931 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1932 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1933 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1da177e4
LT		 1934}
1935
1936/**
1937 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1938 * @args: device IDENTIFY data / SCSI command of interest.
1939 * @actor: Callback hook for desired SCSI command simulator
1940 *
1941 * Takes care of the hard work of simulating a SCSI command...
1942 * Mapping the response buffer, calling the command's handler,
1943 * and handling the handler's return value. This return value
1944 * indicates whether the handler wishes the SCSI command to be
ae006510
DG		 1945 * completed successfully (0), or not (in which case cmd->result
1946 * and sense buffer are assumed to be set).
1da177e4
LT		 1947 *
1948 * LOCKING:
cca3974e 1949 * spin_lock_irqsave(host lock)
1da177e4 1950 */
f0761be3 1951static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
87340e98 1952 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1da177e4
LT		 1953{
1954 u8 *rbuf;
87340e98 1955 unsigned int rc;
1da177e4 1956 struct scsi_cmnd *cmd = args->cmd;
b445c568
JG		 1957 unsigned long flags;
1958
87340e98
TH		 1959 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1960 rc = actor(args, rbuf);
1961 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
b445c568 1962
ae006510 1963 if (rc == 0)
1da177e4 1964 cmd->result = SAM_STAT_GOOD;
ae006510 1965 args->done(cmd);
1da177e4
LT		 1966}
1967
1968/**
1969 * ata_scsiop_inq_std - Simulate INQUIRY command
1970 * @args: device IDENTIFY data / SCSI command of interest.
1971 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 1972 *
1973 * Returns standard device identification data associated
b142eb65 1974 * with non-VPD INQUIRY command output.
1da177e4
LT		 1975 *
1976 * LOCKING:
cca3974e 1977 * spin_lock_irqsave(host lock)
1da177e4 1978 */
87340e98 1979static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 1980{
87340e98 1981 const u8 versions[] = {
f9ca5ab8 1982 0x00,
87340e98
TH		 1983 0x60, /* SAM-3 (no version claimed) */
1984
1985 0x03,
1986 0x20, /* SBC-2 (no version claimed) */
1987
1988 0x02,
1989 0x60 /* SPC-3 (no version claimed) */
1990 };
f9ca5ab8
HR		 1991 const u8 versions_zbc[] = {
1992 0x00,
1993 0xA0, /* SAM-5 (no version claimed) */
1994
1995 0x04,
1996 0xC0, /* SBC-3 (no version claimed) */
1997
1998 0x04,
1999 0x60, /* SPC-4 (no version claimed) */
2000
2001 0x60,
2002 0x20, /* ZBC (no version claimed) */
2003 };
2004
1da177e4
LT		 2005 u8 hdr[] = {
2006 TYPE_DISK,
2007 0,
2008 0x5, /* claim SPC-3 version compatibility */
2009 2,
2010 95 - 4
2011 };
2012
87340e98
TH		 2013 VPRINTK("ENTER\n");
2014
8a3e33cf
ML		 2015 /* set scsi removable (RMB) bit per ata bit, or if the
2016 * AHCI port says it's external (Hotplug-capable, eSATA).
2017 */
2018 if (ata_id_removable(args->id) ||
2019 (args->dev->link->ap->pflags & ATA_PFLAG_EXTERNAL))
1da177e4
LT		 2020 hdr[1] |= (1 << 7);
2021
f9ca5ab8
HR		 2022 if (args->dev->class == ATA_DEV_ZAC) {
2023 hdr[0] = TYPE_ZBC;
2024 hdr[2] = 0x6; /* ZBC is defined in SPC-4 */
2025 }
2026
1da177e4 2027 memcpy(rbuf, hdr, sizeof(hdr));
87340e98
TH		 2028 memcpy(&rbuf[8], "ATA ", 8);
2029 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
c49a6bf5
KB		 2030
2031 /* From SAT, use last 2 words from fw rev unless they are spaces */
2032 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4);
2033 if (strncmp(&rbuf[32], " ", 4) == 0)
2034 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1da177e4 2035
87340e98
TH		 2036 if (rbuf[32] == 0 || rbuf[32] == ' ')
2037 memcpy(&rbuf[32], "n/a ", 4);
1da177e4 2038
f9ca5ab8
HR		 2039 if (args->dev->class == ATA_DEV_ZAC)
2040 memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc));
2041 else
2042 memcpy(rbuf + 58, versions, sizeof(versions));
1da177e4
LT		 2043
2044 return 0;
2045}
2046
2047/**
b142eb65 2048 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1da177e4
LT		 2049 * @args: device IDENTIFY data / SCSI command of interest.
2050 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2051 *
b142eb65 2052 * Returns list of inquiry VPD pages available.
1da177e4
LT		 2053 *
2054 * LOCKING:
cca3974e 2055 * spin_lock_irqsave(host lock)
1da177e4 2056 */
87340e98 2057static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2058{
2059 const u8 pages[] = {
2060 0x00, /* page 0x00, this page */
2061 0x80, /* page 0x80, unit serial no page */
1e9dbc92
MW		 2062 0x83, /* page 0x83, device ident page */
2063 0x89, /* page 0x89, ata info page */
18f0f978 2064 0xb0, /* page 0xb0, block limits page */
1e9dbc92 2065 0xb1, /* page 0xb1, block device characteristics page */
02e0a604 2066 0xb2, /* page 0xb2, thin provisioning page */
1da177e4 2067 };
1da177e4 2068
87340e98
TH		 2069 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
2070 memcpy(rbuf + 4, pages, sizeof(pages));
1da177e4
LT		 2071 return 0;
2072}
2073
2074/**
b142eb65 2075 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1da177e4
LT		 2076 * @args: device IDENTIFY data / SCSI command of interest.
2077 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2078 *
2079 * Returns ATA device serial number.
2080 *
2081 * LOCKING:
cca3974e 2082 * spin_lock_irqsave(host lock)
1da177e4 2083 */
87340e98 2084static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2085{
2086 const u8 hdr[] = {
2087 0,
2088 0x80, /* this page code */
2089 0,
a0cf733b 2090 ATA_ID_SERNO_LEN, /* page len */
1da177e4 2091 };
1da177e4 2092
87340e98
TH		 2093 memcpy(rbuf, hdr, sizeof(hdr));
2094 ata_id_string(args->id, (unsigned char *) &rbuf[4],
2095 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1da177e4
LT		 2096 return 0;
2097}
2098
1da177e4 2099/**
b142eb65 2100 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1da177e4
LT		 2101 * @args: device IDENTIFY data / SCSI command of interest.
2102 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2103 *
b142eb65
JG		 2104 * Yields two logical unit device identification designators:
2105 * - vendor specific ASCII containing the ATA serial number
2106 * - SAT defined "t10 vendor id based" containing ASCII vendor
2107 * name ("ATA "), model and serial numbers.
1da177e4
LT		 2108 *
2109 * LOCKING:
cca3974e 2110 * spin_lock_irqsave(host lock)
1da177e4 2111 */
87340e98 2112static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2113{
b142eb65 2114 const int sat_model_serial_desc_len = 68;
87340e98 2115 int num;
1da177e4 2116
b142eb65
JG		 2117 rbuf[1] = 0x83; /* this page code */
2118 num = 4;
2119
87340e98
TH		 2120 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2121 rbuf[num + 0] = 2;
2122 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2123 num += 4;
2124 ata_id_string(args->id, (unsigned char *) rbuf + num,
2125 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2126 num += ATA_ID_SERNO_LEN;
2127
2128 /* SAT defined lu model and serial numbers descriptor */
2129 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2130 rbuf[num + 0] = 2;
2131 rbuf[num + 1] = 1;
2132 rbuf[num + 3] = sat_model_serial_desc_len;
2133 num += 4;
2134 memcpy(rbuf + num, "ATA ", 8);
2135 num += 8;
2136 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2137 ATA_ID_PROD_LEN);
2138 num += ATA_ID_PROD_LEN;
2139 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2140 ATA_ID_SERNO_LEN);
2141 num += ATA_ID_SERNO_LEN;
2142
6b3b9d73
HR		 2143 if (ata_id_has_wwn(args->id)) {
2144 /* SAT defined lu world wide name */
2145 /* piv=0, assoc=lu, code_set=binary, designator=NAA */
2146 rbuf[num + 0] = 1;
2147 rbuf[num + 1] = 3;
2148 rbuf[num + 3] = ATA_ID_WWN_LEN;
2149 num += 4;
2150 ata_id_string(args->id, (unsigned char *) rbuf + num,
2151 ATA_ID_WWN, ATA_ID_WWN_LEN);
2152 num += ATA_ID_WWN_LEN;
2153 }
b142eb65 2154 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
1da177e4
LT		 2155 return 0;
2156}
2157
ad355b46
JG		 2158/**
2159 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2160 * @args: device IDENTIFY data / SCSI command of interest.
2161 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
ad355b46
JG		 2162 *
2163 * Yields SAT-specified ATA VPD page.
2164 *
2165 * LOCKING:
2166 * spin_lock_irqsave(host lock)
2167 */
87340e98 2168static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
ad355b46 2169{
ad355b46 2170 struct ata_taskfile tf;
ad355b46 2171
ad355b46
JG		 2172 memset(&tf, 0, sizeof(tf));
2173
87340e98
TH		 2174 rbuf[1] = 0x89; /* our page code */
2175 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2176 rbuf[3] = (0x238 & 0xff);
ad355b46 2177
87340e98
TH		 2178 memcpy(&rbuf[8], "linux ", 8);
2179 memcpy(&rbuf[16], "libata ", 16);
2180 memcpy(&rbuf[32], DRV_VERSION, 4);
ad355b46
JG		 2181
2182 /* we don't store the ATA device signature, so we fake it */
2183
2184 tf.command = ATA_DRDY; /* really, this is Status reg */
2185 tf.lbal = 0x1;
2186 tf.nsect = 0x1;
2187
87340e98
TH		 2188 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2189 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
ad355b46 2190
87340e98 2191 rbuf[56] = ATA_CMD_ID_ATA;
ad355b46 2192
87340e98 2193 memcpy(&rbuf[60], &args->id[0], 512);
ad355b46
JG		 2194 return 0;
2195}
2196
18f0f978
CH		 2197static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
2198{
295124dc 2199 u16 min_io_sectors;
18f0f978
CH		 2200
2201 rbuf[1] = 0xb0;
2202 rbuf[3] = 0x3c; /* required VPD size with unmap support */
2203
2204 /*
2205 * Optimal transfer length granularity.
2206 *
2207 * This is always one physical block, but for disks with a smaller
2208 * logical than physical sector size we need to figure out what the
2209 * latter is.
2210 */
295124dc 2211 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
18f0f978
CH		 2212 put_unaligned_be16(min_io_sectors, &rbuf[6]);
2213
2214 /*
2215 * Optimal unmap granularity.
2216 *
2217 * The ATA spec doesn't even know about a granularity or alignment
2218 * for the TRIM command. We can leave away most of the unmap related
2219 * VPD page entries, but we have specifify a granularity to signal
2220 * that we support some form of unmap - in thise case via WRITE SAME
2221 * with the unmap bit set.
2222 */
e78db4df 2223 if (ata_id_has_trim(args->id)) {
5f4e2066 2224 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
18f0f978 2225 put_unaligned_be32(1, &rbuf[28]);
e78db4df 2226 }
18f0f978
CH		 2227
2228 return 0;
2229}
2230
1e9dbc92
MW		 2231static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2232{
4bca3286
MP		 2233 int form_factor = ata_id_form_factor(args->id);
2234 int media_rotation_rate = ata_id_rotation_rate(args->id);
2235
1e9dbc92
MW		 2236 rbuf[1] = 0xb1;
2237 rbuf[3] = 0x3c;
4bca3286
MP		 2238 rbuf[4] = media_rotation_rate >> 8;
2239 rbuf[5] = media_rotation_rate;
2240 rbuf[7] = form_factor;
1e9dbc92
MW		 2241
2242 return 0;
2243}
2244
02e0a604
MP		 2245static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
2246{
2247 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2248 rbuf[1] = 0xb2;
2249 rbuf[3] = 0x4;
2250 rbuf[5] = 1 << 6; /* TPWS */
2251
2252 return 0;
2253}
2254
1da177e4 2255/**
0cba632b 2256 * ata_scsiop_noop - Command handler that simply returns success.
1da177e4
LT		 2257 * @args: device IDENTIFY data / SCSI command of interest.
2258 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2259 *
2260 * No operation. Simply returns success to caller, to indicate
2261 * that the caller should successfully complete this SCSI command.
2262 *
2263 * LOCKING:
cca3974e 2264 * spin_lock_irqsave(host lock)
1da177e4 2265 */
87340e98 2266static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2267{
2268 VPRINTK("ENTER\n");
2269 return 0;
2270}
2271
6ca8e794
PB		 2272/**
2273 * modecpy - Prepare response for MODE SENSE
2274 * @dest: output buffer
2275 * @src: data being copied
2276 * @n: length of mode page
2277 * @changeable: whether changeable parameters are requested
2278 *
2279 * Generate a generic MODE SENSE page for either current or changeable
2280 * parameters.
2281 *
2282 * LOCKING:
2283 * None.
2284 */
2285static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
2286{
2287 if (changeable) {
2288 memcpy(dest, src, 2);
2289 memset(dest + 2, 0, n - 2);
2290 } else {
2291 memcpy(dest, src, n);
2292 }
2293}
2294
1da177e4
LT		 2295/**
2296 * ata_msense_caching - Simulate MODE SENSE caching info page
2297 * @id: device IDENTIFY data
87340e98 2298 * @buf: output buffer
6ca8e794 2299 * @changeable: whether changeable parameters are requested
1da177e4
LT		 2300 *
2301 * Generate a caching info page, which conditionally indicates
2302 * write caching to the SCSI layer, depending on device
2303 * capabilities.
2304 *
2305 * LOCKING:
2306 * None.
2307 */
6ca8e794 2308static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
1da177e4 2309{
6ca8e794 2310 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
1b26d29c 2311 if (changeable || ata_id_wcache_enabled(id))
87340e98 2312 buf[2] |= (1 << 2); /* write cache enable */
6ca8e794 2313 if (!changeable && !ata_id_rahead_enabled(id))
87340e98
TH		 2314 buf[12] |= (1 << 5); /* disable read ahead */
2315 return sizeof(def_cache_mpage);
1da177e4
LT		 2316}
2317
2318/**
2319 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
87340e98 2320 * @buf: output buffer
6ca8e794 2321 * @changeable: whether changeable parameters are requested
1da177e4
LT		 2322 *
2323 * Generate a generic MODE SENSE control mode page.
2324 *
2325 * LOCKING:
2326 * None.
2327 */
6ca8e794 2328static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable)
1da177e4 2329{
6ca8e794 2330 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable);
00ac37f5 2331 return sizeof(def_control_mpage);
1da177e4
LT		 2332}
2333
2334/**
2335 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
ec2a20e6 2336 * @buf: output buffer
6ca8e794 2337 * @changeable: whether changeable parameters are requested
1da177e4
LT		 2338 *
2339 * Generate a generic MODE SENSE r/w error recovery page.
2340 *
2341 * LOCKING:
2342 * None.
2343 */
6ca8e794 2344static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable)
1da177e4 2345{
6ca8e794
PB		 2346 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage),
2347 changeable);
00ac37f5 2348 return sizeof(def_rw_recovery_mpage);
1da177e4
LT		 2349}
2350
48bdc8ec
JA		 2351/*
2352 * We can turn this into a real blacklist if it's needed, for now just
2353 * blacklist any Maxtor BANC1G10 revision firmware
2354 */
2355static int ata_dev_supports_fua(u16 *id)
2356{
a0cf733b 2357 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
48bdc8ec 2358
c3c013a2
JG		 2359 if (!libata_fua)
2360 return 0;
48bdc8ec
JA		 2361 if (!ata_id_has_fua(id))
2362 return 0;
2363
a0cf733b
TH		 2364 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2365 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
48bdc8ec 2366
2e02671d 2367 if (strcmp(model, "Maxtor"))
48bdc8ec 2368 return 1;
2e02671d 2369 if (strcmp(fw, "BANC1G10"))
48bdc8ec
JA		 2370 return 1;
2371
2372 return 0; /* blacklisted */
2373}
2374
1da177e4
LT		 2375/**
2376 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2377 * @args: device IDENTIFY data / SCSI command of interest.
2378 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2379 *
00ac37f5
DG		 2380 * Simulate MODE SENSE commands. Assume this is invoked for direct
2381 * access devices (e.g. disks) only. There should be no block
2382 * descriptor for other device types.
1da177e4
LT		 2383 *
2384 * LOCKING:
cca3974e 2385 * spin_lock_irqsave(host lock)
1da177e4 2386 */
87340e98 2387static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2388{
9a3dccc4 2389 struct ata_device *dev = args->dev;
87340e98 2390 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
00ac37f5
DG		 2391 const u8 sat_blk_desc[] = {
2392 0, 0, 0, 0, /* number of blocks: sat unspecified */
2393 0,
2394 0, 0x2, 0x0 /* block length: 512 bytes */
2395 };
2396 u8 pg, spg;
87340e98 2397 unsigned int ebd, page_control, six_byte;
9a3dccc4 2398 u8 dpofua;
1da177e4
LT		 2399
2400 VPRINTK("ENTER\n");
2401
2402 six_byte = (scsicmd[0] == MODE_SENSE);
00ac37f5
DG		 2403 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2404 /*
2405 * LLBA bit in msense(10) ignored (compliant)
1da177e4 2406 */
00ac37f5 2407
1da177e4 2408 page_control = scsicmd[2] >> 6;
ae006510
DG		 2409 switch (page_control) {
2410 case 0: /* current */
6ca8e794
PB		 2411 case 1: /* changeable */
2412 case 2: /* defaults */
ae006510
DG		 2413 break; /* supported */
2414 case 3: /* saved */
2415 goto saving_not_supp;
ae006510
DG		 2416 default:
2417 goto invalid_fld;
2418 }
1da177e4 2419
87340e98
TH		 2420 if (six_byte)
2421 p += 4 + (ebd ? 8 : 0);
2422 else
2423 p += 8 + (ebd ? 8 : 0);
1da177e4 2424
00ac37f5
DG		 2425 pg = scsicmd[2] & 0x3f;
2426 spg = scsicmd[3];
2427 /*
2428 * No mode subpages supported (yet) but asking for _all_
2429 * subpages may be valid
2430 */
2431 if (spg && (spg != ALL_SUB_MPAGES))
2432 goto invalid_fld;
2433
2434 switch(pg) {
2435 case RW_RECOVERY_MPAGE:
6ca8e794 2436 p += ata_msense_rw_recovery(p, page_control == 1);
1da177e4
LT		 2437 break;
2438
00ac37f5 2439 case CACHE_MPAGE:
6ca8e794 2440 p += ata_msense_caching(args->id, p, page_control == 1);
1da177e4
LT		 2441 break;
2442
87340e98 2443 case CONTROL_MPAGE:
6ca8e794 2444 p += ata_msense_ctl_mode(p, page_control == 1);
1da177e4 2445 break;
1da177e4 2446
00ac37f5 2447 case ALL_MPAGES:
6ca8e794
PB		 2448 p += ata_msense_rw_recovery(p, page_control == 1);
2449 p += ata_msense_caching(args->id, p, page_control == 1);
2450 p += ata_msense_ctl_mode(p, page_control == 1);
1da177e4
LT		 2451 break;
2452
2453 default: /* invalid page code */
ae006510 2454 goto invalid_fld;
1da177e4
LT		 2455 }
2456
9a3dccc4 2457 dpofua = 0;
f79d409f 2458 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
9a3dccc4
TH		 2459 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2460 dpofua = 1 << 4;
2461
1da177e4 2462 if (six_byte) {
87340e98
TH		 2463 rbuf[0] = p - rbuf - 1;
2464 rbuf[2] |= dpofua;
00ac37f5 2465 if (ebd) {
87340e98
TH		 2466 rbuf[3] = sizeof(sat_blk_desc);
2467 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
00ac37f5 2468 }
1da177e4 2469 } else {
87340e98
TH		 2470 unsigned int output_len = p - rbuf - 2;
2471
1da177e4 2472 rbuf[0] = output_len >> 8;
87340e98
TH		 2473 rbuf[1] = output_len;
2474 rbuf[3] |= dpofua;
00ac37f5 2475 if (ebd) {
87340e98
TH		 2476 rbuf[7] = sizeof(sat_blk_desc);
2477 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
00ac37f5 2478 }
1da177e4 2479 }
1da177e4 2480 return 0;
ae006510
DG		 2481
2482invalid_fld:
2483 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2484 /* "Invalid field in cbd" */
2485 return 1;
2486
2487saving_not_supp:
2488 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2489 /* "Saving parameters not supported" */
2490 return 1;
1da177e4
LT		 2491}
2492
2493/**
2494 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2495 * @args: device IDENTIFY data / SCSI command of interest.
2496 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2497 *
2498 * Simulate READ CAPACITY commands.
2499 *
2500 * LOCKING:
6a36261e 2501 * None.
1da177e4 2502 */
87340e98 2503static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2504{
61d79a8e
MP		 2505 struct ata_device *dev = args->dev;
2506 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
295124dc
GG		 2507 u32 sector_size; /* physical sector size in bytes */
2508 u8 log2_per_phys;
2509 u16 lowest_aligned;
2510
2511 sector_size = ata_id_logical_sector_size(dev->id);
2512 log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2513 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
1da177e4
LT		 2514
2515 VPRINTK("ENTER\n");
2516
1da177e4 2517 if (args->cmd->cmnd[0] == READ_CAPACITY) {
6a36261e
TH		 2518 if (last_lba >= 0xffffffffULL)
2519 last_lba = 0xffffffff;
0c144d0d 2520
1da177e4 2521 /* sector count, 32-bit */
87340e98
TH		 2522 rbuf[0] = last_lba >> (8 * 3);
2523 rbuf[1] = last_lba >> (8 * 2);
2524 rbuf[2] = last_lba >> (8 * 1);
2525 rbuf[3] = last_lba;
1da177e4
LT		 2526
2527 /* sector size */
295124dc
GG		 2528 rbuf[4] = sector_size >> (8 * 3);
2529 rbuf[5] = sector_size >> (8 * 2);
2530 rbuf[6] = sector_size >> (8 * 1);
2531 rbuf[7] = sector_size;
1da177e4
LT		 2532 } else {
2533 /* sector count, 64-bit */
87340e98
TH		 2534 rbuf[0] = last_lba >> (8 * 7);
2535 rbuf[1] = last_lba >> (8 * 6);
2536 rbuf[2] = last_lba >> (8 * 5);
2537 rbuf[3] = last_lba >> (8 * 4);
2538 rbuf[4] = last_lba >> (8 * 3);
2539 rbuf[5] = last_lba >> (8 * 2);
2540 rbuf[6] = last_lba >> (8 * 1);
2541 rbuf[7] = last_lba;
1da177e4
LT		 2542
2543 /* sector size */
295124dc
GG		 2544 rbuf[ 8] = sector_size >> (8 * 3);
2545 rbuf[ 9] = sector_size >> (8 * 2);
2546 rbuf[10] = sector_size >> (8 * 1);
2547 rbuf[11] = sector_size;
61d79a8e
MP		 2548
2549 rbuf[12] = 0;
295124dc 2550 rbuf[13] = log2_per_phys;
61d79a8e
MP		 2551 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2552 rbuf[15] = lowest_aligned;
18f0f978 2553
71d126fd
AF		 2554 if (ata_id_has_trim(args->id) &&
2555 !(dev->horkage & ATA_HORKAGE_NOTRIM)) {
e61f7d1c 2556 rbuf[14] |= 0x80; /* LBPME */
e78db4df 2557
e61f7d1c
MP		 2558 if (ata_id_has_zero_after_trim(args->id) &&
2559 dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) {
2560 ata_dev_info(dev, "Enabling discard_zeroes_data\n");
2561 rbuf[14] |= 0x40; /* LBPRZ */
2562 }
e78db4df 2563 }
1da177e4 2564 }
1da177e4
LT		 2565 return 0;
2566}
2567
2568/**
2569 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2570 * @args: device IDENTIFY data / SCSI command of interest.
2571 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2572 *
2573 * Simulate REPORT LUNS command.
2574 *
2575 * LOCKING:
cca3974e 2576 * spin_lock_irqsave(host lock)
1da177e4 2577 */
87340e98 2578static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2579{
2580 VPRINTK("ENTER\n");
2581 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2582
2583 return 0;
2584}
2585
77853bf2 2586static void atapi_sense_complete(struct ata_queued_cmd *qc)
a939c963 2587{
74e6c8c3 2588 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
c6e6e666
JG		 2589 /* FIXME: not quite right; we don't want the
2590 * translation of taskfile registers into
2591 * a sense descriptors, since that's only
2592 * correct for ATA, not ATAPI
2593 */
750426aa 2594 ata_gen_passthru_sense(qc);
74e6c8c3 2595 }
a939c963 2596
2aa8f5d6 2597 ata_qc_done(qc);
c6e6e666 2598}
a939c963 2599
c6e6e666
JG		 2600/* is it pointless to prefer PIO for "safety reasons"? */
2601static inline int ata_pio_use_silly(struct ata_port *ap)
2602{
2603 return (ap->flags & ATA_FLAG_PIO_DMA);
2604}
2605
2606static void atapi_request_sense(struct ata_queued_cmd *qc)
2607{
2608 struct ata_port *ap = qc->ap;
2609 struct scsi_cmnd *cmd = qc->scsicmd;
2610
2611 DPRINTK("ATAPI request sense\n");
a939c963 2612
7ccd720d 2613 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
a939c963 2614
127102ae 2615#ifdef CONFIG_ATA_SFF
855d854a
JB		 2616 if (ap->ops->sff_tf_read)
2617 ap->ops->sff_tf_read(ap, &qc->tf);
127102ae 2618#endif
c6e6e666
JG		 2619
2620 /* fill these in, for the case where they are -not- overwritten */
2621 cmd->sense_buffer[0] = 0x70;
2622 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2623
2624 ata_qc_reinit(qc);
2625
93f8fecb 2626 /* setup sg table and init transfer direction */
cadb7345 2627 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
93f8fecb 2628 ata_sg_init(qc, &qc->sgent, 1);
a939c963
JG		 2629 qc->dma_dir = DMA_FROM_DEVICE;
2630
6e7846e9 2631 memset(&qc->cdb, 0, qc->dev->cdb_len);
a939c963
JG		 2632 qc->cdb[0] = REQUEST_SENSE;
2633 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2634
2635 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2636 qc->tf.command = ATA_CMD_PACKET;
2637
c6e6e666 2638 if (ata_pio_use_silly(ap)) {
0dc36888 2639 qc->tf.protocol = ATAPI_PROT_DMA;
c6e6e666
JG		 2640 qc->tf.feature |= ATAPI_PKT_DMA;
2641 } else {
0dc36888 2642 qc->tf.protocol = ATAPI_PROT_PIO;
2db78dd3
AC		 2643 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2644 qc->tf.lbah = 0;
c6e6e666 2645 }
a939c963
JG		 2646 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2647
c6e6e666 2648 qc->complete_fn = atapi_sense_complete;
a939c963 2649
8e0e694a 2650 ata_qc_issue(qc);
a939c963
JG		 2651
2652 DPRINTK("EXIT\n");
2653}
2654
77853bf2 2655static void atapi_qc_complete(struct ata_queued_cmd *qc)
1da177e4
LT		 2656{
2657 struct scsi_cmnd *cmd = qc->scsicmd;
a22e2eb0 2658 unsigned int err_mask = qc->err_mask;
1da177e4 2659
a7dac447 2660 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
e12669e7 2661
246619da
TH		 2662 /* handle completion from new EH */
2663 if (unlikely(qc->ap->ops->error_handler &&
2664 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2665
2666 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2667 /* FIXME: not quite right; we don't want the
2668 * translation of taskfile registers into a
2669 * sense descriptors, since that's only
2670 * correct for ATA, not ATAPI
2671 */
750426aa 2672 ata_gen_passthru_sense(qc);
246619da
TH		 2673 }
2674
22aac089
TH		 2675 /* SCSI EH automatically locks door if sdev->locked is
2676 * set. Sometimes door lock request continues to
2677 * fail, for example, when no media is present. This
2678 * creates a loop - SCSI EH issues door lock which
2679 * fails and gets invoked again to acquire sense data
2680 * for the failed command.
2681 *
2682 * If door lock fails, always clear sdev->locked to
2683 * avoid this infinite loop.
2a5f07b5
TH		 2684 *
2685 * This may happen before SCSI scan is complete. Make
2686 * sure qc->dev->sdev isn't NULL before dereferencing.
22aac089 2687 */
2a5f07b5 2688 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
22aac089
TH		 2689 qc->dev->sdev->locked = 0;
2690
246619da 2691 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2aa8f5d6 2692 ata_qc_done(qc);
246619da
TH		 2693 return;
2694 }
2695
2696 /* successful completion or old EH failure path */
a7dac447 2697 if (unlikely(err_mask & AC_ERR_DEV)) {
1da177e4 2698 cmd->result = SAM_STAT_CHECK_CONDITION;
c6e6e666 2699 atapi_request_sense(qc);
77853bf2 2700 return;
74e6c8c3 2701 } else if (unlikely(err_mask)) {
a7dac447
JG		 2702 /* FIXME: not quite right; we don't want the
2703 * translation of taskfile registers into
2704 * a sense descriptors, since that's only
2705 * correct for ATA, not ATAPI
2706 */
750426aa 2707 ata_gen_passthru_sense(qc);
74e6c8c3 2708 } else {
1da177e4
LT		 2709 u8 *scsicmd = cmd->cmnd;
2710
fd71da46 2711 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
b445c568 2712 unsigned long flags;
87340e98 2713 u8 *buf;
b445c568 2714
87340e98 2715 buf = ata_scsi_rbuf_get(cmd, true, &flags);
a15dbeb4
JG		 2716
2717 /* ATAPI devices typically report zero for their SCSI version,
2718 * and sometimes deviate from the spec WRT response data
2719 * format. If SCSI version is reported as zero like normal,
2720 * then we make the following fixups: 1) Fake MMC-5 version,
2721 * to indicate to the Linux scsi midlayer this is a modern
2722 * device. 2) Ensure response data format / ATAPI information
2723 * are always correct.
a15dbeb4
JG		 2724 */
2725 if (buf[2] == 0) {
2726 buf[2] = 0x5;
2727 buf[3] = 0x32;
2728 }
2729
87340e98 2730 ata_scsi_rbuf_put(cmd, true, &flags);
1da177e4 2731 }
a15dbeb4 2732
1da177e4
LT		 2733 cmd->result = SAM_STAT_GOOD;
2734 }
2735
2aa8f5d6 2736 ata_qc_done(qc);
1da177e4
LT		 2737}
2738/**
2739 * atapi_xlat - Initialize PACKET taskfile
2740 * @qc: command structure to be initialized
1da177e4
LT		 2741 *
2742 * LOCKING:
cca3974e 2743 * spin_lock_irqsave(host lock)
1da177e4
LT		 2744 *
2745 * RETURNS:
2746 * Zero on success, non-zero on failure.
2747 */
ad706991 2748static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
1da177e4 2749{
542b1444 2750 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4 2751 struct ata_device *dev = qc->dev;
542b1444 2752 int nodata = (scmd->sc_data_direction == DMA_NONE);
5895ef9a 2753 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2db78dd3 2754 unsigned int nbytes;
1da177e4 2755
2e5704f6
TH		 2756 memset(qc->cdb, 0, dev->cdb_len);
2757 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
1da177e4
LT		 2758
2759 qc->complete_fn = atapi_qc_complete;
2760
2761 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
542b1444 2762 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1da177e4
LT		 2763 qc->tf.flags |= ATA_TFLAG_WRITE;
2764 DPRINTK("direction: write\n");
2765 }
2766
2767 qc->tf.command = ATA_CMD_PACKET;
aacda375 2768 ata_qc_set_pc_nbytes(qc);
e00f1ff3
TH		 2769
2770 /* check whether ATAPI DMA is safe */
5895ef9a 2771 if (!nodata && !using_pio && atapi_check_dma(qc))
e00f1ff3 2772 using_pio = 1;
1da177e4 2773
e190222d
TH		 2774 /* Some controller variants snoop this value for Packet
2775 * transfers to do state machine and FIFO management. Thus we
2776 * want to set it properly, and for DMA where it is
2777 * effectively meaningless.
2778 */
aacda375 2779 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2db78dd3 2780
e190222d
TH		 2781 /* Most ATAPI devices which honor transfer chunk size don't
2782 * behave according to the spec when odd chunk size which
2783 * matches the transfer length is specified. If the number of
2784 * bytes to transfer is 2n+1. According to the spec, what
2785 * should happen is to indicate that 2n+1 is going to be
2786 * transferred and transfer 2n+2 bytes where the last byte is
2787 * padding.
2788 *
2789 * In practice, this doesn't happen. ATAPI devices first
2790 * indicate and transfer 2n bytes and then indicate and
2791 * transfer 2 bytes where the last byte is padding.
2792 *
2793 * This inconsistency confuses several controllers which
2794 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2795 * These controllers use actual number of transferred bytes to
2796 * update DMA poitner and transfer of 4n+2 bytes make those
2797 * controller push DMA pointer by 4n+4 bytes because SATA data
2798 * FISes are aligned to 4 bytes. This causes data corruption
2799 * and buffer overrun.
2800 *
2801 * Always setting nbytes to even number solves this problem
2802 * because then ATAPI devices don't have to split data at 2n
2803 * boundaries.
2804 */
2805 if (nbytes & 0x1)
2806 nbytes++;
2807
2db78dd3
AC		 2808 qc->tf.lbam = (nbytes & 0xFF);
2809 qc->tf.lbah = (nbytes >> 8);
2810
5895ef9a
TH		 2811 if (nodata)
2812 qc->tf.protocol = ATAPI_PROT_NODATA;
2813 else if (using_pio)
2814 qc->tf.protocol = ATAPI_PROT_PIO;
2815 else {
e00f1ff3 2816 /* DMA data xfer */
0dc36888 2817 qc->tf.protocol = ATAPI_PROT_DMA;
1da177e4
LT		 2818 qc->tf.feature |= ATAPI_PKT_DMA;
2819
91163006
TH		 2820 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2821 (scmd->sc_data_direction != DMA_TO_DEVICE))
95de719a 2822 /* some SATA bridges need us to indicate data xfer direction */
1da177e4 2823 qc->tf.feature |= ATAPI_DMADIR;
1da177e4
LT		 2824 }
2825
2db78dd3
AC		 2826
2827 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2828 as ATAPI tape drives don't get this right otherwise */
1da177e4
LT		 2829 return 0;
2830}
2831
2dcb407e 2832static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
ab5b3a5b 2833{
071f44b1 2834 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 2835 if (likely(devno < ata_link_max_devices(&ap->link)))
2836 return &ap->link.device[devno];
2837 } else {
2838 if (likely(devno < ap->nr_pmp_links))
2839 return &ap->pmp_link[devno].device[0];
2840 }
2841
ab5b3a5b
TH		 2842 return NULL;
2843}
2844
2dcb407e
JG		 2845static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2846 const struct scsi_device *scsidev)
ab5b3a5b 2847{
41bda9c9
TH		 2848 int devno;
2849
ab5b3a5b 2850 /* skip commands not addressed to targets we simulate */
071f44b1 2851 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 2852 if (unlikely(scsidev->channel || scsidev->lun))
2853 return NULL;
2854 devno = scsidev->id;
2855 } else {
2856 if (unlikely(scsidev->id || scsidev->lun))
2857 return NULL;
2858 devno = scsidev->channel;
2859 }
ab5b3a5b 2860
41bda9c9 2861 return ata_find_dev(ap, devno);
ab5b3a5b
TH		 2862}
2863
1da177e4
LT		 2864/**
2865 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2866 * @ap: ATA port to which the device is attached
2867 * @scsidev: SCSI device from which we derive the ATA device
2868 *
2869 * Given various information provided in struct scsi_cmnd,
2870 * map that onto an ATA bus, and using that mapping
2871 * determine which ata_device is associated with the
2872 * SCSI command to be sent.
2873 *
2874 * LOCKING:
cca3974e 2875 * spin_lock_irqsave(host lock)
1da177e4
LT		 2876 *
2877 * RETURNS:
2878 * Associated ATA device, or %NULL if not found.
2879 */
1da177e4 2880static struct ata_device *
057ace5e 2881ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
1da177e4 2882{
ab5b3a5b 2883 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
1da177e4 2884
2486fa56 2885 if (unlikely(!dev || !ata_dev_enabled(dev)))
1da177e4
LT		 2886 return NULL;
2887
1da177e4
LT		 2888 return dev;
2889}
2890
b095518e
JG		 2891/*
2892 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2893 * @byte1: Byte 1 from pass-thru CDB.
2894 *
2895 * RETURNS:
2896 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2897 */
2898static u8
2899ata_scsi_map_proto(u8 byte1)
2900{
2901 switch((byte1 & 0x1e) >> 1) {
2dcb407e
JG		 2902 case 3: /* Non-data */
2903 return ATA_PROT_NODATA;
2904
2905 case 6: /* DMA */
2906 case 10: /* UDMA Data-in */
2907 case 11: /* UDMA Data-Out */
2908 return ATA_PROT_DMA;
2909
2910 case 4: /* PIO Data-in */
2911 case 5: /* PIO Data-out */
2912 return ATA_PROT_PIO;
2913
ee7fb331
VK		 2914 case 12: /* FPDMA */
2915 return ATA_PROT_NCQ;
2916
2dcb407e
JG		 2917 case 0: /* Hard Reset */
2918 case 1: /* SRST */
2919 case 8: /* Device Diagnostic */
2920 case 9: /* Device Reset */
2921 case 7: /* DMA Queued */
2dcb407e
JG		 2922 case 15: /* Return Response Info */
2923 default: /* Reserved */
2924 break;
b095518e
JG		 2925 }
2926
2927 return ATA_PROT_UNKNOWN;
2928}
2929
2930/**
2931 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2932 * @qc: command structure to be initialized
b095518e
JG		 2933 *
2934 * Handles either 12 or 16-byte versions of the CDB.
2935 *
2936 * RETURNS:
2937 * Zero on success, non-zero on failure.
2938 */
ad706991 2939static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
b095518e
JG		 2940{
2941 struct ata_taskfile *tf = &(qc->tf);
542b1444 2942 struct scsi_cmnd *scmd = qc->scsicmd;
f79d409f 2943 struct ata_device *dev = qc->dev;
ad706991 2944 const u8 *cdb = scmd->cmnd;
b095518e 2945
542b1444 2946 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
9a405257 2947 goto invalid_fld;
8190bdb9 2948
5f8e7f17
VK		 2949 /* enable LBA */
2950 tf->flags |= ATA_TFLAG_LBA;
2951
b095518e
JG		 2952 /*
2953 * 12 and 16 byte CDBs use different offsets to
2954 * provide the various register values.
2955 */
542b1444 2956 if (cdb[0] == ATA_16) {
b095518e
JG		 2957 /*
2958 * 16-byte CDB - may contain extended commands.
2959 *
2960 * If that is the case, copy the upper byte register values.
2961 */
542b1444
TH		 2962 if (cdb[1] & 0x01) {
2963 tf->hob_feature = cdb[3];
2964 tf->hob_nsect = cdb[5];
2965 tf->hob_lbal = cdb[7];
2966 tf->hob_lbam = cdb[9];
2967 tf->hob_lbah = cdb[11];
b095518e
JG		 2968 tf->flags |= ATA_TFLAG_LBA48;
2969 } else
2970 tf->flags &= ~ATA_TFLAG_LBA48;
2971
2972 /*
2973 * Always copy low byte, device and command registers.
2974 */
542b1444
TH		 2975 tf->feature = cdb[4];
2976 tf->nsect = cdb[6];
2977 tf->lbal = cdb[8];
2978 tf->lbam = cdb[10];
2979 tf->lbah = cdb[12];
2980 tf->device = cdb[13];
2981 tf->command = cdb[14];
b095518e
JG		 2982 } else {
2983 /*
2984 * 12-byte CDB - incapable of extended commands.
2985 */
2986 tf->flags &= ~ATA_TFLAG_LBA48;
2987
542b1444
TH		 2988 tf->feature = cdb[3];
2989 tf->nsect = cdb[4];
2990 tf->lbal = cdb[5];
2991 tf->lbam = cdb[6];
2992 tf->lbah = cdb[7];
2993 tf->device = cdb[8];
2994 tf->command = cdb[9];
b095518e 2995 }
fa4453c4 2996
ee7fb331
VK		 2997 /* For NCQ commands with FPDMA protocol, copy the tag value */
2998 if (tf->protocol == ATA_PROT_NCQ)
2999 tf->nsect = qc->tag << 3;
3000
fa4453c4
AL		 3001 /* enforce correct master/slave bit */
3002 tf->device = dev->devno ?
3003 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
b095518e 3004
bd30add8 3005 switch (tf->command) {
295124dc 3006 /* READ/WRITE LONG use a non-standard sect_size */
bd30add8
TH		 3007 case ATA_CMD_READ_LONG:
3008 case ATA_CMD_READ_LONG_ONCE:
3009 case ATA_CMD_WRITE_LONG:
3010 case ATA_CMD_WRITE_LONG_ONCE:
3011 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
3012 goto invalid_fld;
3013 qc->sect_size = scsi_bufflen(scmd);
295124dc
GG		 3014 break;
3015
3016 /* commands using reported Logical Block size (e.g. 512 or 4K) */
3017 case ATA_CMD_CFA_WRITE_NE:
3018 case ATA_CMD_CFA_TRANS_SECT:
3019 case ATA_CMD_CFA_WRITE_MULT_NE:
3020 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
3021 case ATA_CMD_READ:
3022 case ATA_CMD_READ_EXT:
3023 case ATA_CMD_READ_QUEUED:
3024 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
3025 case ATA_CMD_FPDMA_READ:
3026 case ATA_CMD_READ_MULTI:
3027 case ATA_CMD_READ_MULTI_EXT:
3028 case ATA_CMD_PIO_READ:
3029 case ATA_CMD_PIO_READ_EXT:
3030 case ATA_CMD_READ_STREAM_DMA_EXT:
3031 case ATA_CMD_READ_STREAM_EXT:
3032 case ATA_CMD_VERIFY:
3033 case ATA_CMD_VERIFY_EXT:
3034 case ATA_CMD_WRITE:
3035 case ATA_CMD_WRITE_EXT:
3036 case ATA_CMD_WRITE_FUA_EXT:
3037 case ATA_CMD_WRITE_QUEUED:
3038 case ATA_CMD_WRITE_QUEUED_FUA_EXT:
3039 case ATA_CMD_FPDMA_WRITE:
3040 case ATA_CMD_WRITE_MULTI:
3041 case ATA_CMD_WRITE_MULTI_EXT:
3042 case ATA_CMD_WRITE_MULTI_FUA_EXT:
3043 case ATA_CMD_PIO_WRITE:
3044 case ATA_CMD_PIO_WRITE_EXT:
3045 case ATA_CMD_WRITE_STREAM_DMA_EXT:
3046 case ATA_CMD_WRITE_STREAM_EXT:
3047 qc->sect_size = scmd->device->sector_size;
3048 break;
3049
3050 /* Everything else uses 512 byte "sectors" */
3051 default:
3052 qc->sect_size = ATA_SECT_SIZE;
bd30add8
TH		 3053 }
3054
3055 /*
3056 * Set flags so that all registers will be written, pass on
3057 * write indication (used for PIO/DMA setup), result TF is
3058 * copied back and we don't whine too much about its failure.
3059 */
bc496ed0 3060 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
bd30add8
TH		 3061 if (scmd->sc_data_direction == DMA_TO_DEVICE)
3062 tf->flags |= ATA_TFLAG_WRITE;
3063
3064 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
3065
3066 /*
3067 * Set transfer length.
3068 *
3069 * TODO: find out if we need to do more here to
3070 * cover scatter/gather case.
3071 */
3072 ata_qc_set_pc_nbytes(qc);
3073
3074 /* We may not issue DMA commands if no DMA mode is set */
3075 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
3076 goto invalid_fld;
3077
1dce589c
AL		 3078 /* sanity check for pio multi commands */
3079 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
3080 goto invalid_fld;
3081
3082 if (is_multi_taskfile(tf)) {
3083 unsigned int multi_count = 1 << (cdb[1] >> 5);
3084
3085 /* compare the passed through multi_count
3086 * with the cached multi_count of libata
3087 */
3088 if (multi_count != dev->multi_count)
a9a79dfe
JP		 3089 ata_dev_warn(dev, "invalid multi_count %u ignored\n",
3090 multi_count);
d26fc955 3091 }
1dce589c 3092
b095518e
JG		 3093 /*
3094 * Filter SET_FEATURES - XFER MODE command -- otherwise,
3095 * SET_FEATURES - XFER MODE must be preceded/succeeded
3096 * by an update to hardware-specific registers for each
3097 * controller (i.e. the reason for ->set_piomode(),
3098 * ->set_dmamode(), and ->post_set_mode() hooks).
3099 */
bd30add8
TH		 3100 if (tf->command == ATA_CMD_SET_FEATURES &&
3101 tf->feature == SETFEATURES_XFER)
9a405257 3102 goto invalid_fld;
b095518e
JG		 3103
3104 /*
bd30add8
TH		 3105 * Filter TPM commands by default. These provide an
3106 * essentially uncontrolled encrypted "back door" between
3107 * applications and the disk. Set libata.allow_tpm=1 if you
3108 * have a real reason for wanting to use them. This ensures
3109 * that installed software cannot easily mess stuff up without
3110 * user intent. DVR type users will probably ship with this enabled
3111 * for movie content management.
b095518e 3112 *
bd30add8
TH		 3113 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3114 * for this and should do in future but that it is not sufficient as
3115 * DCS is an optional feature set. Thus we also do the software filter
3116 * so that we comply with the TC consortium stated goal that the user
3117 * can turn off TC features of their system.
b095518e 3118 */
bd30add8
TH		 3119 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
3120 goto invalid_fld;
e61e0672 3121
b095518e 3122 return 0;
9a405257
TH		 3123
3124 invalid_fld:
542b1444 3125 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
9a405257
TH		 3126 /* "Invalid field in cdb" */
3127 return 1;
b095518e
JG		 3128}
3129
18f0f978
CH		 3130static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3131{
3132 struct ata_taskfile *tf = &qc->tf;
3133 struct scsi_cmnd *scmd = qc->scsicmd;
3134 struct ata_device *dev = qc->dev;
3135 const u8 *cdb = scmd->cmnd;
3136 u64 block;
3137 u32 n_block;
3138 u32 size;
3139 void *buf;
3140
3141 /* we may not issue DMA commands if no DMA mode is set */
3142 if (unlikely(!dev->dma_mode))
3143 goto invalid_fld;
3144
3145 if (unlikely(scmd->cmd_len < 16))
3146 goto invalid_fld;
3147 scsi_16_lba_len(cdb, &block, &n_block);
3148
3149 /* for now we only support WRITE SAME with the unmap bit set */
3150 if (unlikely(!(cdb[1] & 0x8)))
3151 goto invalid_fld;
3152
3153 /*
3154 * WRITE SAME always has a sector sized buffer as payload, this
3155 * should never be a multiple entry S/G list.
3156 */
3157 if (!scsi_sg_count(scmd))
3158 goto invalid_fld;
3159
3160 buf = page_address(sg_page(scsi_sglist(scmd)));
d0634c4a 3161 size = ata_set_lba_range_entries(buf, 512, block, n_block);
18f0f978 3162
87fb6c31
MC		 3163 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) {
3164 /* Newer devices support queued TRIM commands */
3165 tf->protocol = ATA_PROT_NCQ;
3166 tf->command = ATA_CMD_FPDMA_SEND;
3167 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f;
3168 tf->nsect = qc->tag << 3;
3169 tf->hob_feature = (size / 512) >> 8;
3170 tf->feature = size / 512;
3171
3172 tf->auxiliary = 1;
3173 } else {
3174 tf->protocol = ATA_PROT_DMA;
3175 tf->hob_feature = 0;
3176 tf->feature = ATA_DSM_TRIM;
3177 tf->hob_nsect = (size / 512) >> 8;
3178 tf->nsect = size / 512;
3179 tf->command = ATA_CMD_DSM;
3180 }
3181
18f0f978
CH		 3182 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3183 ATA_TFLAG_WRITE;
3184
3185 ata_qc_set_pc_nbytes(qc);
3186
3187 return 0;
3188
3189 invalid_fld:
3190 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3191 /* "Invalid field in cdb" */
3192 return 1;
3193}
3194
1b26d29c
PB		 3195/**
3196 * ata_mselect_caching - Simulate MODE SELECT for caching info page
3197 * @qc: Storage for translated ATA taskfile
3198 * @buf: input buffer
3199 * @len: number of valid bytes in the input buffer
3200 *
3201 * Prepare a taskfile to modify caching information for the device.
3202 *
3203 * LOCKING:
3204 * None.
3205 */
3206static int ata_mselect_caching(struct ata_queued_cmd *qc,
3207 const u8 *buf, int len)
3208{
3209 struct ata_taskfile *tf = &qc->tf;
3210 struct ata_device *dev = qc->dev;
3211 char mpage[CACHE_MPAGE_LEN];
3212 u8 wce;
3213
3214 /*
3215 * The first two bytes of def_cache_mpage are a header, so offsets
3216 * in mpage are off by 2 compared to buf. Same for len.
3217 */
3218
3219 if (len != CACHE_MPAGE_LEN - 2)
3220 return -EINVAL;
3221
3222 wce = buf[0] & (1 << 2);
3223
3224 /*
3225 * Check that read-only bits are not modified.
3226 */
3227 ata_msense_caching(dev->id, mpage, false);
3228 mpage[2] &= ~(1 << 2);
3229 mpage[2] |= wce;
3230 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0)
3231 return -EINVAL;
3232
3233 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3234 tf->protocol = ATA_PROT_NODATA;
3235 tf->nsect = 0;
3236 tf->command = ATA_CMD_SET_FEATURES;
3237 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF;
3238 return 0;
3239}
3240
3241/**
3242 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands
3243 * @qc: Storage for translated ATA taskfile
3244 *
3245 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
3246 * Assume this is invoked for direct access devices (e.g. disks) only.
3247 * There should be no block descriptor for other device types.
3248 *
3249 * LOCKING:
3250 * spin_lock_irqsave(host lock)
3251 */
3252static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
3253{
3254 struct scsi_cmnd *scmd = qc->scsicmd;
3255 const u8 *cdb = scmd->cmnd;
3256 const u8 *p;
3257 u8 pg, spg;
3258 unsigned six_byte, pg_len, hdr_len, bd_len;
3259 int len;
3260
3261 VPRINTK("ENTER\n");
3262
3263 six_byte = (cdb[0] == MODE_SELECT);
3264 if (six_byte) {
3265 if (scmd->cmd_len < 5)
3266 goto invalid_fld;
3267
3268 len = cdb[4];
3269 hdr_len = 4;
3270 } else {
3271 if (scmd->cmd_len < 9)
3272 goto invalid_fld;
3273
3274 len = (cdb[7] << 8) + cdb[8];
3275 hdr_len = 8;
3276 }
3277
3278 /* We only support PF=1, SP=0. */
3279 if ((cdb[1] & 0x11) != 0x10)
3280 goto invalid_fld;
3281
3282 /* Test early for possible overrun. */
3283 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len)
3284 goto invalid_param_len;
3285
3286 p = page_address(sg_page(scsi_sglist(scmd)));
3287
3288 /* Move past header and block descriptors. */
3289 if (len < hdr_len)
3290 goto invalid_param_len;
3291
3292 if (six_byte)
3293 bd_len = p[3];
3294 else
3295 bd_len = (p[6] << 8) + p[7];
3296
3297 len -= hdr_len;
3298 p += hdr_len;
3299 if (len < bd_len)
3300 goto invalid_param_len;
3301 if (bd_len != 0 && bd_len != 8)
3302 goto invalid_param;
3303
3304 len -= bd_len;
3305 p += bd_len;
3306 if (len == 0)
3307 goto skip;
3308
3309 /* Parse both possible formats for the mode page headers. */
3310 pg = p[0] & 0x3f;
3311 if (p[0] & 0x40) {
3312 if (len < 4)
3313 goto invalid_param_len;
3314
3315 spg = p[1];
3316 pg_len = (p[2] << 8) | p[3];
3317 p += 4;
3318 len -= 4;
3319 } else {
3320 if (len < 2)
3321 goto invalid_param_len;
3322
3323 spg = 0;
3324 pg_len = p[1];
3325 p += 2;
3326 len -= 2;
3327 }
3328
3329 /*
3330 * No mode subpages supported (yet) but asking for _all_
3331 * subpages may be valid
3332 */
3333 if (spg && (spg != ALL_SUB_MPAGES))
3334 goto invalid_param;
3335 if (pg_len > len)
3336 goto invalid_param_len;
3337
3338 switch (pg) {
3339 case CACHE_MPAGE:
3340 if (ata_mselect_caching(qc, p, pg_len) < 0)
3341 goto invalid_param;
3342 break;
3343
3344 default: /* invalid page code */
3345 goto invalid_param;
3346 }
3347
3348 /*
3349 * Only one page has changeable data, so we only support setting one
3350 * page at a time.
3351 */
3352 if (len > pg_len)
3353 goto invalid_param;
3354
3355 return 0;
3356
3357 invalid_fld:
3358 /* "Invalid field in CDB" */
3359 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
3360 return 1;
3361
3362 invalid_param:
3363 /* "Invalid field in parameter list" */
3364 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0);
3365 return 1;
3366
3367 invalid_param_len:
3368 /* "Parameter list length error" */
3369 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3370 return 1;
3371
3372 skip:
3373 scmd->result = SAM_STAT_GOOD;
3374 return 1;
3375}
3376
1da177e4
LT		 3377/**
3378 * ata_get_xlat_func - check if SCSI to ATA translation is possible
3379 * @dev: ATA device
3380 * @cmd: SCSI command opcode to consider
3381 *
3382 * Look up the SCSI command given, and determine whether the
3383 * SCSI command is to be translated or simulated.
3384 *
3385 * RETURNS:
3386 * Pointer to translation function if possible, %NULL if not.
3387 */
3388
3389static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
3390{
3391 switch (cmd) {
3392 case READ_6:
3393 case READ_10:
3394 case READ_16:
3395
3396 case WRITE_6:
3397 case WRITE_10:
3398 case WRITE_16:
3399 return ata_scsi_rw_xlat;
3400
0cdd6eb7 3401 case WRITE_SAME_16:
18f0f978
CH		 3402 return ata_scsi_write_same_xlat;
3403
1da177e4
LT		 3404 case SYNCHRONIZE_CACHE:
3405 if (ata_try_flush_cache(dev))
3406 return ata_scsi_flush_xlat;
3407 break;
3408
3409 case VERIFY:
3410 case VERIFY_16:
3411 return ata_scsi_verify_xlat;
b095518e
JG		 3412
3413 case ATA_12:
3414 case ATA_16:
3415 return ata_scsi_pass_thru;
da61396d 3416
1b26d29c
PB		 3417 case MODE_SELECT:
3418 case MODE_SELECT_10:
3419 return ata_scsi_mode_select_xlat;
3420 break;
3421
972dcafb
DG		 3422 case START_STOP:
3423 return ata_scsi_start_stop_xlat;
1da177e4
LT		 3424 }
3425
3426 return NULL;
3427}
3428
3429/**
3430 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3431 * @ap: ATA port to which the command was being sent
3432 * @cmd: SCSI command to dump
3433 *
3434 * Prints the contents of a SCSI command via printk().
3435 */
3436
3437static inline void ata_scsi_dump_cdb(struct ata_port *ap,
3438 struct scsi_cmnd *cmd)
3439{
3440#ifdef ATA_DEBUG
3441 struct scsi_device *scsidev = cmd->device;
3442 u8 *scsicmd = cmd->cmnd;
3443
3444 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
44877b4e 3445 ap->print_id,
1da177e4
LT		 3446 scsidev->channel, scsidev->id, scsidev->lun,
3447 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
3448 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
3449 scsicmd[8]);
3450#endif
3451}
3452
542b1444 3453static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2115ea94 3454 struct ata_device *dev)
eb3f0f9c 3455{
baf4fdfa
ML		 3456 u8 scsi_op = scmd->cmnd[0];
3457 ata_xlat_func_t xlat_func;
2115ea94
TH		 3458 int rc = 0;
3459
9162c657 3460 if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
baf4fdfa
ML		 3461 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
3462 goto bad_cdb_len;
eb3f0f9c 3463
baf4fdfa
ML		 3464 xlat_func = ata_get_xlat_func(dev, scsi_op);
3465 } else {
3466 if (unlikely(!scmd->cmd_len))
3467 goto bad_cdb_len;
3468
3469 xlat_func = NULL;
3470 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
3471 /* relay SCSI command to ATAPI device */
607126c2
ML		 3472 int len = COMMAND_SIZE(scsi_op);
3473 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
baf4fdfa
ML		 3474 goto bad_cdb_len;
3475
3476 xlat_func = atapi_xlat;
3477 } else {
3478 /* ATA_16 passthru, treat as an ATA command */
3479 if (unlikely(scmd->cmd_len > 16))
3480 goto bad_cdb_len;
3481
3482 xlat_func = ata_get_xlat_func(dev, scsi_op);
3483 }
3484 }
3485
3486 if (xlat_func)
b27dcfb0 3487 rc = ata_scsi_translate(dev, scmd, xlat_func);
baf4fdfa 3488 else
b27dcfb0 3489 ata_scsi_simulate(dev, scmd);
2115ea94
TH		 3490
3491 return rc;
baf4fdfa
ML		 3492
3493 bad_cdb_len:
3494 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3495 scmd->cmd_len, scsi_op, dev->cdb_len);
3496 scmd->result = DID_ERROR << 16;
b27dcfb0 3497 scmd->scsi_done(scmd);
baf4fdfa 3498 return 0;
eb3f0f9c
BK		 3499}
3500
1da177e4
LT		 3501/**
3502 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
23e701e6 3503 * @shost: SCSI host of command to be sent
1da177e4 3504 * @cmd: SCSI command to be sent
1da177e4
LT		 3505 *
3506 * In some cases, this function translates SCSI commands into
3507 * ATA taskfiles, and queues the taskfiles to be sent to
3508 * hardware. In other cases, this function simulates a
3509 * SCSI device by evaluating and responding to certain
3510 * SCSI commands. This creates the overall effect of
3511 * ATA and ATAPI devices appearing as SCSI devices.
3512 *
3513 * LOCKING:
23e701e6 3514 * ATA host lock
1da177e4
LT		 3515 *
3516 * RETURNS:
2115ea94
TH		 3517 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3518 * 0 otherwise.
1da177e4 3519 */
23e701e6 3520int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
1da177e4
LT		 3521{
3522 struct ata_port *ap;
3523 struct ata_device *dev;
3524 struct scsi_device *scsidev = cmd->device;
2115ea94 3525 int rc = 0;
23e701e6 3526 unsigned long irq_flags;
1da177e4 3527
35bb94b1 3528 ap = ata_shost_to_port(shost);
005a5a06 3529
23e701e6 3530 spin_lock_irqsave(ap->lock, irq_flags);
1da177e4
LT		 3531
3532 ata_scsi_dump_cdb(ap, cmd);
3533
3534 dev = ata_scsi_find_dev(ap, scsidev);
eb3f0f9c 3535 if (likely(dev))
b27dcfb0 3536 rc = __ata_scsi_queuecmd(cmd, dev);
eb3f0f9c 3537 else {
1da177e4 3538 cmd->result = (DID_BAD_TARGET << 16);
23e701e6 3539 cmd->scsi_done(cmd);
1da177e4
LT		 3540 }
3541
23e701e6
JG		 3542 spin_unlock_irqrestore(ap->lock, irq_flags);
3543
2115ea94 3544 return rc;
1da177e4
LT		 3545}
3546
3547/**
3548 * ata_scsi_simulate - simulate SCSI command on ATA device
c893a3ae 3549 * @dev: the target device
1da177e4 3550 * @cmd: SCSI command being sent to device.
1da177e4
LT		 3551 *
3552 * Interprets and directly executes a select list of SCSI commands
3553 * that can be handled internally.
3554 *
3555 * LOCKING:
cca3974e 3556 * spin_lock_irqsave(host lock)
1da177e4
LT		 3557 */
3558
b27dcfb0 3559void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
1da177e4
LT		 3560{
3561 struct ata_scsi_args args;
057ace5e 3562 const u8 *scsicmd = cmd->cmnd;
45394145 3563 u8 tmp8;
1da177e4 3564
9a3dccc4
TH		 3565 args.dev = dev;
3566 args.id = dev->id;
1da177e4 3567 args.cmd = cmd;
b27dcfb0 3568 args.done = cmd->scsi_done;
1da177e4
LT		 3569
3570 switch(scsicmd[0]) {
2dcb407e
JG		 3571 /* TODO: worth improving? */
3572 case FORMAT_UNIT:
b27dcfb0 3573 ata_scsi_invalid_field(cmd);
2dcb407e
JG		 3574 break;
3575
3576 case INQUIRY:
3577 if (scsicmd[1] & 2) /* is CmdDt set? */
b27dcfb0 3578 ata_scsi_invalid_field(cmd);
2dcb407e
JG		 3579 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3580 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3581 else switch (scsicmd[2]) {
3582 case 0x00:
3583 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
1da177e4 3584 break;
2dcb407e
JG		 3585 case 0x80:
3586 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
1da177e4 3587 break;
2dcb407e
JG		 3588 case 0x83:
3589 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
1da177e4 3590 break;
2dcb407e
JG		 3591 case 0x89:
3592 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3593 break;
18f0f978
CH		 3594 case 0xb0:
3595 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
3596 break;
1e9dbc92
MW		 3597 case 0xb1:
3598 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3599 break;
02e0a604
MP		 3600 case 0xb2:
3601 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
3602 break;
2dcb407e 3603 default:
b27dcfb0 3604 ata_scsi_invalid_field(cmd);
1da177e4 3605 break;
2dcb407e
JG		 3606 }
3607 break;
3608
3609 case MODE_SENSE:
3610 case MODE_SENSE_10:
3611 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3612 break;
3613
2dcb407e
JG		 3614 case READ_CAPACITY:
3615 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3616 break;
3617
eb846d9f 3618 case SERVICE_ACTION_IN_16:
2dcb407e 3619 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
1da177e4 3620 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2dcb407e 3621 else
b27dcfb0 3622 ata_scsi_invalid_field(cmd);
2dcb407e 3623 break;
1da177e4 3624
2dcb407e
JG		 3625 case REPORT_LUNS:
3626 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3627 break;
1da177e4 3628
2dcb407e
JG		 3629 case REQUEST_SENSE:
3630 ata_scsi_set_sense(cmd, 0, 0, 0);
3631 cmd->result = (DRIVER_SENSE << 24);
b27dcfb0 3632 cmd->scsi_done(cmd);
2dcb407e 3633 break;
1da177e4 3634
2dcb407e
JG		 3635 /* if we reach this, then writeback caching is disabled,
3636 * turning this into a no-op.
3637 */
3638 case SYNCHRONIZE_CACHE:
3639 /* fall through */
3640
3641 /* no-op's, complete with success */
3642 case REZERO_UNIT:
3643 case SEEK_6:
3644 case SEEK_10:
3645 case TEST_UNIT_READY:
3646 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3647 break;
45394145 3648
2dcb407e
JG		 3649 case SEND_DIAGNOSTIC:
3650 tmp8 = scsicmd[1] & ~(1 << 3);
3651 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
00bd0202 3652 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
2dcb407e 3653 else
b27dcfb0 3654 ata_scsi_invalid_field(cmd);
2dcb407e 3655 break;
1da177e4 3656
2dcb407e
JG		 3657 /* all other commands */
3658 default:
3659 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3660 /* "Invalid command operation code" */
b27dcfb0 3661 cmd->scsi_done(cmd);
2dcb407e 3662 break;
1da177e4
LT		 3663 }
3664}
3665
f3187195
TH		 3666int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3667{
3668 int i, rc;
3669
3670 for (i = 0; i < host->n_ports; i++) {
3671 struct ata_port *ap = host->ports[i];
3672 struct Scsi_Host *shost;
3673
3674 rc = -ENOMEM;
3675 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3676 if (!shost)
3677 goto err_alloc;
3678
9ee4f393 3679 shost->eh_noresume = 1;
f3187195
TH		 3680 *(struct ata_port **)&shost->hostdata[0] = ap;
3681 ap->scsi_host = shost;
3682
d9027470 3683 shost->transportt = ata_scsi_transport_template;
f3187195
TH		 3684 shost->unique_id = ap->print_id;
3685 shost->max_id = 16;
3686 shost->max_lun = 1;
3687 shost->max_channel = 1;
3688 shost->max_cmd_len = 16;
54b2b50c 3689 shost->no_write_same = 1;
f3187195 3690
31cc23b3
TH		 3691 /* Schedule policy is determined by ->qc_defer()
3692 * callback and it needs to see every deferred qc.
3693 * Set host_blocked to 1 to prevent SCSI midlayer from
3694 * automatically deferring requests.
3695 */
3696 shost->max_host_blocked = 1;
3697
f8fc75dc
LM		 3698 rc = scsi_add_host_with_dma(ap->scsi_host,
3699 &ap->tdev, ap->host->dev);
f3187195
TH		 3700 if (rc)
3701 goto err_add;
3702 }
3703
3704 return 0;
3705
3706 err_add:
3707 scsi_host_put(host->ports[i]->scsi_host);
3708 err_alloc:
3709 while (--i >= 0) {
3710 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3711
3712 scsi_remove_host(shost);
3713 scsi_host_put(shost);
3714 }
3715 return rc;
3716}
3717
1ae46317 3718void ata_scsi_scan_host(struct ata_port *ap, int sync)
644dd0cc 3719{
1ae46317
TH		 3720 int tries = 5;
3721 struct ata_device *last_failed_dev = NULL;
41bda9c9 3722 struct ata_link *link;
1ae46317 3723 struct ata_device *dev;
644dd0cc 3724
1ae46317 3725 repeat:
1eca4365
TH		 3726 ata_for_each_link(link, ap, EDGE) {
3727 ata_for_each_dev(dev, link, ENABLED) {
41bda9c9
TH		 3728 struct scsi_device *sdev;
3729 int channel = 0, id = 0;
3edebac4 3730
1eca4365 3731 if (dev->sdev)
41bda9c9 3732 continue;
3f19ee8c 3733
41bda9c9
TH		 3734 if (ata_is_host_link(link))
3735 id = dev->devno;
3736 else
3737 channel = link->pmp;
3738
3739 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3740 NULL);
3741 if (!IS_ERR(sdev)) {
3742 dev->sdev = sdev;
3743 scsi_device_put(sdev);
295124dc
GG		 3744 } else {
3745 dev->sdev = NULL;
41bda9c9 3746 }
3edebac4 3747 }
3f19ee8c 3748 }
1ae46317
TH		 3749
3750 /* If we scanned while EH was in progress or allocation
3751 * failure occurred, scan would have failed silently. Check
3752 * whether all devices are attached.
3753 */
1eca4365
TH		 3754 ata_for_each_link(link, ap, EDGE) {
3755 ata_for_each_dev(dev, link, ENABLED) {
3756 if (!dev->sdev)
41bda9c9
TH		 3757 goto exit_loop;
3758 }
1ae46317 3759 }
41bda9c9
TH		 3760 exit_loop:
3761 if (!link)
1ae46317
TH		 3762 return;
3763
3764 /* we're missing some SCSI devices */
3765 if (sync) {
3766 /* If caller requested synchrnous scan && we've made
3767 * any progress, sleep briefly and repeat.
3768 */
3769 if (dev != last_failed_dev) {
3770 msleep(100);
3771 last_failed_dev = dev;
3772 goto repeat;
3773 }
3774
3775 /* We might be failing to detect boot device, give it
3776 * a few more chances.
3777 */
3778 if (--tries) {
3779 msleep(100);
3780 goto repeat;
3781 }
3782
a9a79dfe
JP		 3783 ata_port_err(ap,
3784 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
1ae46317
TH		 3785 }
3786
ad72cf98 3787 queue_delayed_work(system_long_wq, &ap->hotplug_task,
1ae46317 3788 round_jiffies_relative(HZ));
644dd0cc 3789}
0ea035a3
TH		 3790
3791/**
3792 * ata_scsi_offline_dev - offline attached SCSI device
3793 * @dev: ATA device to offline attached SCSI device for
3794 *
3795 * This function is called from ata_eh_hotplug() and responsible
3796 * for taking the SCSI device attached to @dev offline. This
cca3974e 3797 * function is called with host lock which protects dev->sdev
0ea035a3
TH		 3798 * against clearing.
3799 *
3800 * LOCKING:
cca3974e 3801 * spin_lock_irqsave(host lock)
0ea035a3
TH		 3802 *
3803 * RETURNS:
3804 * 1 if attached SCSI device exists, 0 otherwise.
3805 */
3806int ata_scsi_offline_dev(struct ata_device *dev)
3807{
3808 if (dev->sdev) {
3809 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3810 return 1;
3811 }
3812 return 0;
3813}
580b2102
TH		 3814
3815/**
3816 * ata_scsi_remove_dev - remove attached SCSI device
3817 * @dev: ATA device to remove attached SCSI device for
3818 *
3819 * This function is called from ata_eh_scsi_hotplug() and
3820 * responsible for removing the SCSI device attached to @dev.
3821 *
3822 * LOCKING:
3823 * Kernel thread context (may sleep).
3824 */
3825static void ata_scsi_remove_dev(struct ata_device *dev)
3826{
9af5c9c9 3827 struct ata_port *ap = dev->link->ap;
580b2102
TH		 3828 struct scsi_device *sdev;
3829 unsigned long flags;
3830
3831 /* Alas, we need to grab scan_mutex to ensure SCSI device
3832 * state doesn't change underneath us and thus
3833 * scsi_device_get() always succeeds. The mutex locking can
3834 * be removed if there is __scsi_device_get() interface which
3835 * increments reference counts regardless of device state.
3836 */
cca3974e 3837 mutex_lock(&ap->scsi_host->scan_mutex);
ba6a1308 3838 spin_lock_irqsave(ap->lock, flags);
580b2102 3839
cca3974e 3840 /* clearing dev->sdev is protected by host lock */
580b2102
TH		 3841 sdev = dev->sdev;
3842 dev->sdev = NULL;
3843
3844 if (sdev) {
3845 /* If user initiated unplug races with us, sdev can go
cca3974e 3846 * away underneath us after the host lock and
580b2102
TH		 3847 * scan_mutex are released. Hold onto it.
3848 */
3849 if (scsi_device_get(sdev) == 0) {
3850 /* The following ensures the attached sdev is
3851 * offline on return from ata_scsi_offline_dev()
3852 * regardless it wins or loses the race
3853 * against this function.
3854 */
3855 scsi_device_set_state(sdev, SDEV_OFFLINE);
3856 } else {
3857 WARN_ON(1);
3858 sdev = NULL;
3859 }
3860 }
3861
ba6a1308 3862 spin_unlock_irqrestore(ap->lock, flags);
cca3974e 3863 mutex_unlock(&ap->scsi_host->scan_mutex);
580b2102
TH		 3864
3865 if (sdev) {
a9a79dfe
JP		 3866 ata_dev_info(dev, "detaching (SCSI %s)\n",
3867 dev_name(&sdev->sdev_gendev));
580b2102
TH		 3868
3869 scsi_remove_device(sdev);
3870 scsi_device_put(sdev);
3871 }
3872}
3873
41bda9c9
TH		 3874static void ata_scsi_handle_link_detach(struct ata_link *link)
3875{
3876 struct ata_port *ap = link->ap;
3877 struct ata_device *dev;
3878
1eca4365 3879 ata_for_each_dev(dev, link, ALL) {
41bda9c9
TH		 3880 unsigned long flags;
3881
3882 if (!(dev->flags & ATA_DFLAG_DETACHED))
3883 continue;
3884
3885 spin_lock_irqsave(ap->lock, flags);
3886 dev->flags &= ~ATA_DFLAG_DETACHED;
3887 spin_unlock_irqrestore(ap->lock, flags);
3888
f1bc1e4c
AL		 3889 if (zpodd_dev_enabled(dev))
3890 zpodd_exit(dev);
3891
41bda9c9
TH		 3892 ata_scsi_remove_dev(dev);
3893 }
3894}
3895
2f294968
KCA		 3896/**
3897 * ata_scsi_media_change_notify - send media change event
c5d0e6a0 3898 * @dev: Pointer to the disk device with media change event
2f294968
KCA		 3899 *
3900 * Tell the block layer to send a media change notification
3901 * event.
3902 *
3903 * LOCKING:
854c73a2 3904 * spin_lock_irqsave(host lock)
2f294968 3905 */
854c73a2 3906void ata_scsi_media_change_notify(struct ata_device *dev)
2f294968 3907{
854c73a2 3908 if (dev->sdev)
f26792d5
JG		 3909 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3910 GFP_ATOMIC);
2f294968 3911}
2f294968 3912
580b2102
TH		 3913/**
3914 * ata_scsi_hotplug - SCSI part of hotplug
65f27f38 3915 * @work: Pointer to ATA port to perform SCSI hotplug on
580b2102
TH		 3916 *
3917 * Perform SCSI part of hotplug. It's executed from a separate
3918 * workqueue after EH completes. This is necessary because SCSI
3919 * hot plugging requires working EH and hot unplugging is
3920 * synchronized with hot plugging with a mutex.
3921 *
3922 * LOCKING:
3923 * Kernel thread context (may sleep).
3924 */
65f27f38 3925void ata_scsi_hotplug(struct work_struct *work)
580b2102 3926{
65f27f38
DH		 3927 struct ata_port *ap =
3928 container_of(work, struct ata_port, hotplug_task.work);
41bda9c9 3929 int i;
580b2102 3930
b51e9e5d 3931 if (ap->pflags & ATA_PFLAG_UNLOADING) {
580b2102
TH		 3932 DPRINTK("ENTER/EXIT - unloading\n");
3933 return;
3934 }
3935
85fbd722
TH		 3936 /*
3937 * XXX - UGLY HACK
3938 *
3939 * The block layer suspend/resume path is fundamentally broken due
3940 * to freezable kthreads and workqueue and may deadlock if a block
3941 * device gets removed while resume is in progress. I don't know
3942 * what the solution is short of removing freezable kthreads and
3943 * workqueues altogether.
3944 *
3945 * The following is an ugly hack to avoid kicking off device
3946 * removal while freezer is active. This is a joke but does avoid
3947 * this particular deadlock scenario.
3948 *
3949 * https://bugzilla.kernel.org/show_bug.cgi?id=62801
3950 * http://marc.info/?l=linux-kernel&m=138695698516487
3951 */
3952#ifdef CONFIG_FREEZER
3953 while (pm_freezing)
3954 msleep(10);
3955#endif
3956
580b2102 3957 DPRINTK("ENTER\n");
ad72cf98 3958 mutex_lock(&ap->scsi_scan_mutex);
580b2102 3959
41bda9c9
TH		 3960 /* Unplug detached devices. We cannot use link iterator here
3961 * because PMP links have to be scanned even if PMP is
3962 * currently not attached. Iterate manually.
3963 */
3964 ata_scsi_handle_link_detach(&ap->link);
3965 if (ap->pmp_link)
3966 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3967 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
580b2102
TH		 3968
3969 /* scan for new ones */
1ae46317 3970 ata_scsi_scan_host(ap, 0);
580b2102 3971
ad72cf98 3972 mutex_unlock(&ap->scsi_scan_mutex);
580b2102
TH		 3973 DPRINTK("EXIT\n");
3974}
83c47bcb
TH		 3975
3976/**
3977 * ata_scsi_user_scan - indication for user-initiated bus scan
3978 * @shost: SCSI host to scan
3979 * @channel: Channel to scan
3980 * @id: ID to scan
3981 * @lun: LUN to scan
3982 *
3983 * This function is called when user explicitly requests bus
3984 * scan. Set probe pending flag and invoke EH.
3985 *
3986 * LOCKING:
3987 * SCSI layer (we don't care)
3988 *
3989 * RETURNS:
3990 * Zero.
3991 */
d9027470 3992int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
9cb78c16 3993 unsigned int id, u64 lun)
83c47bcb
TH		 3994{
3995 struct ata_port *ap = ata_shost_to_port(shost);
3996 unsigned long flags;
41bda9c9 3997 int devno, rc = 0;
83c47bcb
TH		 3998
3999 if (!ap->ops->error_handler)
4000 return -EOPNOTSUPP;
4001
41bda9c9 4002 if (lun != SCAN_WILD_CARD && lun)
83c47bcb
TH		 4003 return -EINVAL;
4004
071f44b1 4005 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 4006 if (channel != SCAN_WILD_CARD && channel)
4007 return -EINVAL;
4008 devno = id;
4009 } else {
4010 if (id != SCAN_WILD_CARD && id)
4011 return -EINVAL;
4012 devno = channel;
4013 }
4014
ba6a1308 4015 spin_lock_irqsave(ap->lock, flags);
83c47bcb 4016
41bda9c9
TH		 4017 if (devno == SCAN_WILD_CARD) {
4018 struct ata_link *link;
4019
1eca4365 4020 ata_for_each_link(link, ap, EDGE) {
41bda9c9 4021 struct ata_eh_info *ehi = &link->eh_info;
b558eddd 4022 ehi->probe_mask |= ATA_ALL_DEVICES;
cf480626 4023 ehi->action |= ATA_EH_RESET;
41bda9c9 4024 }
83c47bcb 4025 } else {
41bda9c9 4026 struct ata_device *dev = ata_find_dev(ap, devno);
83c47bcb
TH		 4027
4028 if (dev) {
41bda9c9 4029 struct ata_eh_info *ehi = &dev->link->eh_info;
9af5c9c9 4030 ehi->probe_mask |= 1 << dev->devno;
cf480626 4031 ehi->action |= ATA_EH_RESET;
83c47bcb
TH		 4032 } else
4033 rc = -EINVAL;
4034 }
4035
309afcb5 4036 if (rc == 0) {
83c47bcb 4037 ata_port_schedule_eh(ap);
309afcb5
TH		 4038 spin_unlock_irqrestore(ap->lock, flags);
4039 ata_port_wait_eh(ap);
4040 } else
4041 spin_unlock_irqrestore(ap->lock, flags);
83c47bcb
TH		 4042
4043 return rc;
4044}
3057ac3c 4045
4046/**
d0171269 4047 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
65f27f38 4048 * @work: Pointer to ATA port to perform scsi_rescan_device()
3057ac3c 4049 *
d0171269 4050 * After ATA pass thru (SAT) commands are executed successfully,
ad72cf98 4051 * libata need to propagate the changes to SCSI layer.
3057ac3c 4052 *
d0171269
TH		 4053 * LOCKING:
4054 * Kernel thread context (may sleep).
3057ac3c 4055 */
65f27f38 4056void ata_scsi_dev_rescan(struct work_struct *work)
3057ac3c 4057{
65f27f38
DH		 4058 struct ata_port *ap =
4059 container_of(work, struct ata_port, scsi_rescan_task);
41bda9c9 4060 struct ata_link *link;
f58229f8 4061 struct ata_device *dev;
f84e7e41 4062 unsigned long flags;
3057ac3c 4063
ad72cf98 4064 mutex_lock(&ap->scsi_scan_mutex);
f84e7e41
TH		 4065 spin_lock_irqsave(ap->lock, flags);
4066
1eca4365
TH		 4067 ata_for_each_link(link, ap, EDGE) {
4068 ata_for_each_dev(dev, link, ENABLED) {
41bda9c9 4069 struct scsi_device *sdev = dev->sdev;
3057ac3c 4070
1eca4365 4071 if (!sdev)
41bda9c9
TH		 4072 continue;
4073 if (scsi_device_get(sdev))
4074 continue;
f84e7e41 4075
41bda9c9
TH		 4076 spin_unlock_irqrestore(ap->lock, flags);
4077 scsi_rescan_device(&(sdev->sdev_gendev));
4078 scsi_device_put(sdev);
4079 spin_lock_irqsave(ap->lock, flags);
4080 }
3057ac3c 4081 }
f84e7e41
TH		 4082
4083 spin_unlock_irqrestore(ap->lock, flags);
ad72cf98 4084 mutex_unlock(&ap->scsi_scan_mutex);
3057ac3c 4085}
80289167
BK		 4086
4087/**
4088 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
4f931374 4089 * @host: ATA host container for all SAS ports
80289167 4090 * @port_info: Information from low-level host driver
cca3974e 4091 * @shost: SCSI host that the scsi device is attached to
80289167
BK		 4092 *
4093 * LOCKING:
4094 * PCI/etc. bus probe sem.
4095 *
4096 * RETURNS:
4097 * ata_port pointer on success / NULL on failure.
4098 */
4099
cca3974e 4100struct ata_port *ata_sas_port_alloc(struct ata_host *host,
80289167 4101 struct ata_port_info *port_info,
cca3974e 4102 struct Scsi_Host *shost)
80289167 4103{
f3187195 4104 struct ata_port *ap;
80289167 4105
f3187195 4106 ap = ata_port_alloc(host);
80289167
BK		 4107 if (!ap)
4108 return NULL;
4109
f3187195 4110 ap->port_no = 0;
a29b5dad 4111 ap->lock = &host->lock;
f3187195
TH		 4112 ap->pio_mask = port_info->pio_mask;
4113 ap->mwdma_mask = port_info->mwdma_mask;
4114 ap->udma_mask = port_info->udma_mask;
4115 ap->flags |= port_info->flags;
4116 ap->ops = port_info->port_ops;
4117 ap->cbl = ATA_CBL_SATA;
4118
80289167
BK		 4119 return ap;
4120}
4121EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
4122
4123/**
4124 * ata_sas_port_start - Set port up for dma.
4125 * @ap: Port to initialize
4126 *
4127 * Called just after data structures for each port are
dde20207 4128 * initialized.
80289167
BK		 4129 *
4130 * May be used as the port_start() entry in ata_port_operations.
4131 *
4132 * LOCKING:
4133 * Inherited from caller.
4134 */
4135int ata_sas_port_start(struct ata_port *ap)
4136{
3f1e046a
NA		 4137 /*
4138 * the port is marked as frozen at allocation time, but if we don't
4139 * have new eh, we won't thaw it
4140 */
4141 if (!ap->ops->error_handler)
4142 ap->pflags &= ~ATA_PFLAG_FROZEN;
dde20207 4143 return 0;
80289167
BK		 4144}
4145EXPORT_SYMBOL_GPL(ata_sas_port_start);
4146
4147/**
4148 * ata_port_stop - Undo ata_sas_port_start()
4149 * @ap: Port to shut down
4150 *
80289167
BK		 4151 * May be used as the port_stop() entry in ata_port_operations.
4152 *
4153 * LOCKING:
4154 * Inherited from caller.
4155 */
4156
4157void ata_sas_port_stop(struct ata_port *ap)
4158{
80289167
BK		 4159}
4160EXPORT_SYMBOL_GPL(ata_sas_port_stop);
4161
b2024459
DW		 4162/**
4163 * ata_sas_async_probe - simply schedule probing and return
4164 * @ap: Port to probe
4165 *
4166 * For batch scheduling of probe for sas attached ata devices, assumes
4167 * the port has already been through ata_sas_port_init()
4168 */
4169void ata_sas_async_probe(struct ata_port *ap)
9508a66f 4170{
b2024459
DW		 4171 __ata_port_probe(ap);
4172}
4173EXPORT_SYMBOL_GPL(ata_sas_async_probe);
9508a66f 4174
b2024459
DW		 4175int ata_sas_sync_probe(struct ata_port *ap)
4176{
4177 return ata_port_probe(ap);
9508a66f 4178}
b2024459
DW		 4179EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
4180
9508a66f 4181
80289167
BK		 4182/**
4183 * ata_sas_port_init - Initialize a SATA device
4184 * @ap: SATA port to initialize
4185 *
4186 * LOCKING:
4187 * PCI/etc. bus probe sem.
4188 *
4189 * RETURNS:
4190 * Zero on success, non-zero on error.
4191 */
4192
4193int ata_sas_port_init(struct ata_port *ap)
4194{
4195 int rc = ap->ops->port_start(ap);
4196
b2024459
DW		 4197 if (rc)
4198 return rc;
4199 ap->print_id = atomic_inc_return(&ata_print_id);
4200 return 0;
80289167
BK		 4201}
4202EXPORT_SYMBOL_GPL(ata_sas_port_init);
4203
4204/**
4205 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
4206 * @ap: SATA port to destroy
4207 *
4208 */
4209
4210void ata_sas_port_destroy(struct ata_port *ap)
4211{
f0d36efd
TH		 4212 if (ap->ops->port_stop)
4213 ap->ops->port_stop(ap);
80289167
BK		 4214 kfree(ap);
4215}
4216EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
4217
4218/**
4219 * ata_sas_slave_configure - Default slave_config routine for libata devices
4220 * @sdev: SCSI device to configure
4221 * @ap: ATA port to which SCSI device is attached
4222 *
4223 * RETURNS:
4224 * Zero.
4225 */
4226
4227int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
4228{
4229 ata_scsi_sdev_config(sdev);
9af5c9c9 4230 ata_scsi_dev_config(sdev, ap->link.device);
80289167
BK		 4231 return 0;
4232}
4233EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
4234
4235/**
4236 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
4237 * @cmd: SCSI command to be sent
80289167
BK		 4238 * @ap: ATA port to which the command is being sent
4239 *
4240 * RETURNS:
08475a19
BK		 4241 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4242 * 0 otherwise.
80289167
BK		 4243 */
4244
b27dcfb0 4245int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
80289167 4246{
08475a19
BK		 4247 int rc = 0;
4248
80289167
BK		 4249 ata_scsi_dump_cdb(ap, cmd);
4250
2486fa56 4251 if (likely(ata_dev_enabled(ap->link.device)))
b27dcfb0 4252 rc = __ata_scsi_queuecmd(cmd, ap->link.device);
80289167
BK		 4253 else {
4254 cmd->result = (DID_BAD_TARGET << 16);
b27dcfb0 4255 cmd->scsi_done(cmd);
80289167 4256 }
08475a19 4257 return rc;
80289167
BK		 4258}
4259EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
98bd4be1
SL		 4260
4261int ata_sas_allocate_tag(struct ata_port *ap)
4262{
4263 unsigned int max_queue = ap->host->n_tags;
4264 unsigned int i, tag;
4265
4266 for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) {
3a028243 4267 tag = tag < max_queue ? tag : 0;
98bd4be1
SL		 4268
4269 /* the last tag is reserved for internal command. */
4270 if (tag == ATA_TAG_INTERNAL)
4271 continue;
4272
4273 if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) {
4274 ap->sas_last_tag = tag;
4275 return tag;
4276 }
4277 }
4278 return -1;
4279}
4280
4281void ata_sas_free_tag(unsigned int tag, struct ata_port *ap)
4282{
4283 clear_bit(tag, &ap->sas_tag_allocated);
4284}
Linux 6.x block layer and io_uring tree(s)