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Merge tag 'v3.10.108' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
7381fe73 52#include <linux/pm_qos.h>
18f0f978 53#include <asm/unaligned.h>
1da177e4
LT		 54
55#include "libata.h"
d9027470 56#include "libata-transport.h"
1da177e4 57
87340e98
TH		 58#define ATA_SCSI_RBUF_SIZE 4096
59
60static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
61static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
b095518e 62
ad706991 63typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
ab5b3a5b 64
2dcb407e 65static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
ab5b3a5b 66 const struct scsi_device *scsidev);
2dcb407e 67static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
ab5b3a5b 68 const struct scsi_device *scsidev);
1da177e4 69
00ac37f5
DG		 70#define RW_RECOVERY_MPAGE 0x1
71#define RW_RECOVERY_MPAGE_LEN 12
72#define CACHE_MPAGE 0x8
73#define CACHE_MPAGE_LEN 20
74#define CONTROL_MPAGE 0xa
75#define CONTROL_MPAGE_LEN 12
76#define ALL_MPAGES 0x3f
77#define ALL_SUB_MPAGES 0xff
78
79
24f75686 80static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
00ac37f5
DG		 81 RW_RECOVERY_MPAGE,
82 RW_RECOVERY_MPAGE_LEN - 2,
24f75686 83 (1 << 7), /* AWRE */
00ac37f5
DG		 84 0, /* read retry count */
85 0, 0, 0, 0,
86 0, /* write retry count */
87 0, 0, 0
88};
89
90static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
91 CACHE_MPAGE,
92 CACHE_MPAGE_LEN - 2,
93 0, /* contains WCE, needs to be 0 for logic */
94 0, 0, 0, 0, 0, 0, 0, 0, 0,
95 0, /* contains DRA, needs to be 0 for logic */
96 0, 0, 0, 0, 0, 0, 0
97};
98
99static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
100 CONTROL_MPAGE,
101 CONTROL_MPAGE_LEN - 2,
102 2, /* DSENSE=0, GLTSD=1 */
103 0, /* [QAM+QERR may be 1, see 05-359r1] */
104 0, 0, 0, 0, 0xff, 0xff,
105 0, 30 /* extended self test time, see 05-359r1 */
106};
107
c93b263e
TH		 108static const char *ata_lpm_policy_names[] = {
109 [ATA_LPM_UNKNOWN] = "max_performance",
110 [ATA_LPM_MAX_POWER] = "max_performance",
111 [ATA_LPM_MED_POWER] = "medium_power",
112 [ATA_LPM_MIN_POWER] = "min_power",
ca77329f
KCA		 113};
114
f07b772d 115static ssize_t ata_scsi_lpm_store(struct device *device,
c93b263e
TH		 116 struct device_attribute *attr,
117 const char *buf, size_t count)
ca77329f 118{
f07b772d 119 struct Scsi_Host *shost = class_to_shost(device);
ca77329f 120 struct ata_port *ap = ata_shost_to_port(shost);
f07b772d
TH		 121 struct ata_link *link;
122 struct ata_device *dev;
c93b263e 123 enum ata_lpm_policy policy;
6b7ae954 124 unsigned long flags;
c93b263e
TH		 125
126 /* UNKNOWN is internal state, iterate from MAX_POWER */
127 for (policy = ATA_LPM_MAX_POWER;
128 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
129 const char *name = ata_lpm_policy_names[policy];
130
131 if (strncmp(name, buf, strlen(name)) == 0)
ca77329f 132 break;
ca77329f 133 }
c93b263e 134 if (policy == ARRAY_SIZE(ata_lpm_policy_names))
ca77329f
KCA		 135 return -EINVAL;
136
6b7ae954 137 spin_lock_irqsave(ap->lock, flags);
f07b772d
TH		 138
139 ata_for_each_link(link, ap, EDGE) {
140 ata_for_each_dev(dev, &ap->link, ENABLED) {
141 if (dev->horkage & ATA_HORKAGE_NOLPM) {
142 count = -EOPNOTSUPP;
143 goto out_unlock;
144 }
145 }
146 }
147
6b7ae954
TH		 148 ap->target_lpm_policy = policy;
149 ata_port_schedule_eh(ap);
f07b772d 150out_unlock:
6b7ae954 151 spin_unlock_irqrestore(ap->lock, flags);
ca77329f
KCA		 152 return count;
153}
154
c93b263e
TH		 155static ssize_t ata_scsi_lpm_show(struct device *dev,
156 struct device_attribute *attr, char *buf)
ca77329f 157{
ee959b00 158 struct Scsi_Host *shost = class_to_shost(dev);
ca77329f 159 struct ata_port *ap = ata_shost_to_port(shost);
ca77329f 160
6b7ae954 161 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
ca77329f
KCA		 162 return -EINVAL;
163
c93b263e 164 return snprintf(buf, PAGE_SIZE, "%s\n",
6b7ae954 165 ata_lpm_policy_names[ap->target_lpm_policy]);
ca77329f 166}
ee959b00 167DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
c93b263e 168 ata_scsi_lpm_show, ata_scsi_lpm_store);
ee959b00 169EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
ca77329f 170
45fabbb7
EO		 171static ssize_t ata_scsi_park_show(struct device *device,
172 struct device_attribute *attr, char *buf)
173{
174 struct scsi_device *sdev = to_scsi_device(device);
175 struct ata_port *ap;
176 struct ata_link *link;
177 struct ata_device *dev;
a464189d 178 unsigned long flags, now;
45fabbb7
EO		 179 unsigned int uninitialized_var(msecs);
180 int rc = 0;
181
182 ap = ata_shost_to_port(sdev->host);
183
184 spin_lock_irqsave(ap->lock, flags);
185 dev = ata_scsi_find_dev(ap, sdev);
186 if (!dev) {
187 rc = -ENODEV;
188 goto unlock;
189 }
190 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
191 rc = -EOPNOTSUPP;
192 goto unlock;
193 }
194
195 link = dev->link;
a464189d 196 now = jiffies;
45fabbb7
EO		 197 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
198 link->eh_context.unloaded_mask & (1 << dev->devno) &&
a464189d
EO		 199 time_after(dev->unpark_deadline, now))
200 msecs = jiffies_to_msecs(dev->unpark_deadline - now);
45fabbb7
EO		 201 else
202 msecs = 0;
203
204unlock:
205 spin_unlock_irq(ap->lock);
206
207 return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
208}
209
210static ssize_t ata_scsi_park_store(struct device *device,
211 struct device_attribute *attr,
212 const char *buf, size_t len)
213{
214 struct scsi_device *sdev = to_scsi_device(device);
215 struct ata_port *ap;
216 struct ata_device *dev;
217 long int input;
218 unsigned long flags;
219 int rc;
220
221 rc = strict_strtol(buf, 10, &input);
222 if (rc || input < -2)
223 return -EINVAL;
224 if (input > ATA_TMOUT_MAX_PARK) {
225 rc = -EOVERFLOW;
226 input = ATA_TMOUT_MAX_PARK;
227 }
228
229 ap = ata_shost_to_port(sdev->host);
230
231 spin_lock_irqsave(ap->lock, flags);
232 dev = ata_scsi_find_dev(ap, sdev);
233 if (unlikely(!dev)) {
234 rc = -ENODEV;
235 goto unlock;
236 }
237 if (dev->class != ATA_DEV_ATA) {
238 rc = -EOPNOTSUPP;
239 goto unlock;
240 }
241
242 if (input >= 0) {
243 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
244 rc = -EOPNOTSUPP;
245 goto unlock;
246 }
247
248 dev->unpark_deadline = ata_deadline(jiffies, input);
249 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
250 ata_port_schedule_eh(ap);
251 complete(&ap->park_req_pending);
252 } else {
253 switch (input) {
254 case -1:
255 dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
256 break;
257 case -2:
258 dev->flags |= ATA_DFLAG_NO_UNLOAD;
259 break;
260 }
261 }
262unlock:
263 spin_unlock_irqrestore(ap->lock, flags);
264
265 return rc ? rc : len;
266}
267DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
268 ata_scsi_park_show, ata_scsi_park_store);
269EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
270
f0761be3
TH		 271static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
272{
273 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
274
275 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
276}
277
18f7ba4c
KCA		 278static ssize_t
279ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
280 const char *buf, size_t count)
281{
282 struct Scsi_Host *shost = class_to_shost(dev);
283 struct ata_port *ap = ata_shost_to_port(shost);
284 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
285 return ap->ops->em_store(ap, buf, count);
286 return -EINVAL;
287}
288
289static ssize_t
290ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
291 char *buf)
292{
293 struct Scsi_Host *shost = class_to_shost(dev);
294 struct ata_port *ap = ata_shost_to_port(shost);
295
296 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
297 return ap->ops->em_show(ap, buf);
298 return -EINVAL;
299}
ea7a5ed5 300DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
18f7ba4c
KCA		 301 ata_scsi_em_message_show, ata_scsi_em_message_store);
302EXPORT_SYMBOL_GPL(dev_attr_em_message);
303
304static ssize_t
305ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
306 char *buf)
307{
308 struct Scsi_Host *shost = class_to_shost(dev);
309 struct ata_port *ap = ata_shost_to_port(shost);
310
311 return snprintf(buf, 23, "%d\n", ap->em_message_type);
312}
313DEVICE_ATTR(em_message_type, S_IRUGO,
314 ata_scsi_em_message_type_show, NULL);
315EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
316
317static ssize_t
318ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
319 char *buf)
320{
321 struct scsi_device *sdev = to_scsi_device(dev);
322 struct ata_port *ap = ata_shost_to_port(sdev->host);
323 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
324
26cd4d65
XF		 325 if (atadev && ap->ops->sw_activity_show &&
326 (ap->flags & ATA_FLAG_SW_ACTIVITY))
18f7ba4c
KCA		 327 return ap->ops->sw_activity_show(atadev, buf);
328 return -EINVAL;
329}
330
331static ssize_t
332ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
333 const char *buf, size_t count)
334{
335 struct scsi_device *sdev = to_scsi_device(dev);
336 struct ata_port *ap = ata_shost_to_port(sdev->host);
337 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
338 enum sw_activity val;
339 int rc;
340
26cd4d65
XF		 341 if (atadev && ap->ops->sw_activity_store &&
342 (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
18f7ba4c
KCA		 343 val = simple_strtoul(buf, NULL, 0);
344 switch (val) {
345 case OFF: case BLINK_ON: case BLINK_OFF:
346 rc = ap->ops->sw_activity_store(atadev, val);
347 if (!rc)
348 return count;
349 else
350 return rc;
351 }
352 }
353 return -EINVAL;
354}
ea7a5ed5 355DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
18f7ba4c
KCA		 356 ata_scsi_activity_store);
357EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
358
45fabbb7
EO		 359struct device_attribute *ata_common_sdev_attrs[] = {
360 &dev_attr_unload_heads,
361 NULL
362};
363EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
364
b27dcfb0 365static void ata_scsi_invalid_field(struct scsi_cmnd *cmd)
ae006510
DG		 366{
367 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
368 /* "Invalid field in cbd" */
b27dcfb0 369 cmd->scsi_done(cmd);
ae006510
DG		 370}
371
1da177e4
LT		 372/**
373 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
374 * @sdev: SCSI device for which BIOS geometry is to be determined
375 * @bdev: block device associated with @sdev
376 * @capacity: capacity of SCSI device
377 * @geom: location to which geometry will be output
378 *
379 * Generic bios head/sector/cylinder calculator
380 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
381 * mapping. Some situations may arise where the disk is not
382 * bootable if this is not used.
383 *
384 * LOCKING:
385 * Defined by the SCSI layer. We don't really care.
386 *
387 * RETURNS:
388 * Zero.
389 */
390int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
391 sector_t capacity, int geom[])
392{
393 geom[0] = 255;
394 geom[1] = 63;
395 sector_div(capacity, 255*63);
396 geom[2] = capacity;
397
398 return 0;
399}
400
d8d9129e
TH		 401/**
402 * ata_scsi_unlock_native_capacity - unlock native capacity
403 * @sdev: SCSI device to adjust device capacity for
404 *
405 * This function is called if a partition on @sdev extends beyond
406 * the end of the device. It requests EH to unlock HPA.
407 *
408 * LOCKING:
409 * Defined by the SCSI layer. Might sleep.
410 */
411void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
412{
413 struct ata_port *ap = ata_shost_to_port(sdev->host);
414 struct ata_device *dev;
415 unsigned long flags;
416
417 spin_lock_irqsave(ap->lock, flags);
418
419 dev = ata_scsi_find_dev(ap, sdev);
420 if (dev && dev->n_sectors < dev->n_native_sectors) {
421 dev->flags |= ATA_DFLAG_UNLOCK_HPA;
422 dev->link->eh_info.action |= ATA_EH_RESET;
423 ata_port_schedule_eh(ap);
424 }
425
426 spin_unlock_irqrestore(ap->lock, flags);
427 ata_port_wait_eh(ap);
428}
429
5924b74c
TH		 430/**
431 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
5eb66fe0 432 * @ap: target port
5924b74c
TH		 433 * @sdev: SCSI device to get identify data for
434 * @arg: User buffer area for identify data
435 *
436 * LOCKING:
437 * Defined by the SCSI layer. We don't really care.
438 *
439 * RETURNS:
440 * Zero on success, negative errno on error.
441 */
94be9a58
JG		 442static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
443 void __user *arg)
5924b74c 444{
5924b74c
TH		 445 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
446 u16 __user *dst = arg;
447 char buf[40];
448
449 if (!dev)
450 return -ENOMSG;
451
452 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
453 return -EFAULT;
454
455 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
456 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
457 return -EFAULT;
458
459 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
460 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
461 return -EFAULT;
462
463 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
464 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
465 return -EFAULT;
466
467 return 0;
468}
469
b095518e
JG		 470/**
471 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
8e8b77dd 472 * @scsidev: Device to which we are issuing command
b095518e
JG		 473 * @arg: User provided data for issuing command
474 *
475 * LOCKING:
476 * Defined by the SCSI layer. We don't really care.
477 *
478 * RETURNS:
479 * Zero on success, negative errno on error.
480 */
b095518e
JG		 481int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
482{
483 int rc = 0;
484 u8 scsi_cmd[MAX_COMMAND_SIZE];
bbe1fe7e 485 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
b095518e 486 int argsize = 0;
85837ebd 487 enum dma_data_direction data_dir;
bbe1fe7e 488 int cmd_result;
b095518e 489
c893a3ae 490 if (arg == NULL)
b095518e
JG		 491 return -EINVAL;
492
493 if (copy_from_user(args, arg, sizeof(args)))
494 return -EFAULT;
495
bbe1fe7e
ET		 496 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
497 if (!sensebuf)
498 return -ENOMEM;
499
b095518e
JG		 500 memset(scsi_cmd, 0, sizeof(scsi_cmd));
501
502 if (args[3]) {
295124dc 503 argsize = ATA_SECT_SIZE * args[3];
b095518e 504 argbuf = kmalloc(argsize, GFP_KERNEL);
54dac83c
JR		 505 if (argbuf == NULL) {
506 rc = -ENOMEM;
507 goto error;
508 }
b095518e
JG		 509
510 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
511 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
2dcb407e 512 block count in sector count field */
85837ebd 513 data_dir = DMA_FROM_DEVICE;
b095518e
JG		 514 } else {
515 scsi_cmd[1] = (3 << 1); /* Non-data */
bbe1fe7e 516 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
85837ebd 517 data_dir = DMA_NONE;
b095518e
JG		 518 }
519
520 scsi_cmd[0] = ATA_16;
521
522 scsi_cmd[4] = args[2];
a4f19040 523 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
b095518e
JG		 524 scsi_cmd[6] = args[3];
525 scsi_cmd[8] = args[1];
526 scsi_cmd[10] = 0x4f;
527 scsi_cmd[12] = 0xc2;
528 } else {
529 scsi_cmd[6] = args[1];
530 }
531 scsi_cmd[14] = args[0];
532
533 /* Good values for timeout and retries? Values below
534 from scsi_ioctl_send_command() for default case... */
bbe1fe7e 535 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
f4f4e47e 536 sensebuf, (10*HZ), 5, 0, NULL);
bbe1fe7e
ET		 537
538 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
539 u8 *desc = sensebuf + 8;
540 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
541
542 /* If we set cc then ATA pass-through will cause a
543 * check condition even if no error. Filter that. */
544 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
545 struct scsi_sense_hdr sshdr;
546 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
2dcb407e 547 &sshdr);
6d3bfc7b
KM		 548 if (sshdr.sense_key == RECOVERED_ERROR &&
549 sshdr.asc == 0 && sshdr.ascq == 0x1d)
bbe1fe7e
ET		 550 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
551 }
552
553 /* Send userspace a few ATA registers (same as drivers/ide) */
2dcb407e
JG		 554 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
555 desc[0] == 0x09) { /* code is "ATA Descriptor" */
556 args[0] = desc[13]; /* status */
557 args[1] = desc[3]; /* error */
558 args[2] = desc[5]; /* sector count (0:7) */
bbe1fe7e
ET		 559 if (copy_to_user(arg, args, sizeof(args)))
560 rc = -EFAULT;
561 }
562 }
563
564
565 if (cmd_result) {
b095518e
JG		 566 rc = -EIO;
567 goto error;
568 }
569
b095518e 570 if ((argbuf)
c893a3ae 571 && copy_to_user(arg + sizeof(args), argbuf, argsize))
b095518e
JG		 572 rc = -EFAULT;
573error:
bbe1fe7e 574 kfree(sensebuf);
8f760780 575 kfree(argbuf);
b095518e
JG		 576 return rc;
577}
578
579/**
580 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
8e8b77dd 581 * @scsidev: Device to which we are issuing command
b095518e
JG		 582 * @arg: User provided data for issuing command
583 *
584 * LOCKING:
585 * Defined by the SCSI layer. We don't really care.
586 *
587 * RETURNS:
588 * Zero on success, negative errno on error.
589 */
590int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
591{
592 int rc = 0;
593 u8 scsi_cmd[MAX_COMMAND_SIZE];
af068bd1
DM		 594 u8 args[7], *sensebuf = NULL;
595 int cmd_result;
b095518e 596
c893a3ae 597 if (arg == NULL)
b095518e
JG		 598 return -EINVAL;
599
600 if (copy_from_user(args, arg, sizeof(args)))
601 return -EFAULT;
602
af068bd1
DM		 603 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
604 if (!sensebuf)
605 return -ENOMEM;
606
b095518e
JG		 607 memset(scsi_cmd, 0, sizeof(scsi_cmd));
608 scsi_cmd[0] = ATA_16;
609 scsi_cmd[1] = (3 << 1); /* Non-data */
af068bd1 610 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
b095518e
JG		 611 scsi_cmd[4] = args[1];
612 scsi_cmd[6] = args[2];
613 scsi_cmd[8] = args[3];
614 scsi_cmd[10] = args[4];
615 scsi_cmd[12] = args[5];
277239f2 616 scsi_cmd[13] = args[6] & 0x4f;
b095518e
JG		 617 scsi_cmd[14] = args[0];
618
b095518e 619 /* Good values for timeout and retries? Values below
2e9edbf8 620 from scsi_ioctl_send_command() for default case... */
af068bd1 621 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
f4f4e47e 622 sensebuf, (10*HZ), 5, 0, NULL);
af068bd1
DM		 623
624 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
625 u8 *desc = sensebuf + 8;
626 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
627
628 /* If we set cc then ATA pass-through will cause a
629 * check condition even if no error. Filter that. */
630 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
631 struct scsi_sense_hdr sshdr;
632 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
633 &sshdr);
6d3bfc7b
KM		 634 if (sshdr.sense_key == RECOVERED_ERROR &&
635 sshdr.asc == 0 && sshdr.ascq == 0x1d)
af068bd1
DM		 636 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
637 }
638
639 /* Send userspace ATA registers */
640 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
641 desc[0] == 0x09) {/* code is "ATA Descriptor" */
642 args[0] = desc[13]; /* status */
643 args[1] = desc[3]; /* error */
644 args[2] = desc[5]; /* sector count (0:7) */
645 args[3] = desc[7]; /* lbal */
646 args[4] = desc[9]; /* lbam */
647 args[5] = desc[11]; /* lbah */
648 args[6] = desc[12]; /* select */
649 if (copy_to_user(arg, args, sizeof(args)))
650 rc = -EFAULT;
651 }
652 }
653
654 if (cmd_result) {
b095518e 655 rc = -EIO;
af068bd1
DM		 656 goto error;
657 }
b095518e 658
af068bd1
DM		 659 error:
660 kfree(sensebuf);
b095518e
JG		 661 return rc;
662}
663
e3cf95dd
AC		 664static int ata_ioc32(struct ata_port *ap)
665{
666 if (ap->flags & ATA_FLAG_PIO_DMA)
667 return 1;
668 if (ap->pflags & ATA_PFLAG_PIO32)
669 return 1;
670 return 0;
671}
672
94be9a58
JG		 673int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
674 int cmd, void __user *arg)
1da177e4 675{
45eb9d85
AB		 676 unsigned long val;
677 int rc = -EINVAL;
e3cf95dd 678 unsigned long flags;
1da177e4 679
1da177e4 680 switch (cmd) {
45eb9d85 681 case HDIO_GET_32BIT:
e3cf95dd
AC		 682 spin_lock_irqsave(ap->lock, flags);
683 val = ata_ioc32(ap);
684 spin_unlock_irqrestore(ap->lock, flags);
45eb9d85 685 return put_user(val, (unsigned long __user *)arg);
1da177e4 686
45eb9d85 687 case HDIO_SET_32BIT:
1da177e4 688 val = (unsigned long) arg;
e3cf95dd
AC		 689 rc = 0;
690 spin_lock_irqsave(ap->lock, flags);
691 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
692 if (val)
693 ap->pflags |= ATA_PFLAG_PIO32;
694 else
695 ap->pflags &= ~ATA_PFLAG_PIO32;
696 } else {
697 if (val != ata_ioc32(ap))
698 rc = -EINVAL;
699 }
700 spin_unlock_irqrestore(ap->lock, flags);
701 return rc;
1da177e4 702
5924b74c 703 case HDIO_GET_IDENTITY:
94be9a58 704 return ata_get_identity(ap, scsidev, arg);
5924b74c 705
b095518e
JG		 706 case HDIO_DRIVE_CMD:
707 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
708 return -EACCES;
709 return ata_cmd_ioctl(scsidev, arg);
710
711 case HDIO_DRIVE_TASK:
712 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
713 return -EACCES;
714 return ata_task_ioctl(scsidev, arg);
715
1da177e4
LT		 716 default:
717 rc = -ENOTTY;
718 break;
719 }
720
1da177e4
LT		 721 return rc;
722}
94be9a58
JG		 723EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
724
725int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
726{
727 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
728 scsidev, cmd, arg);
729}
730EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
1da177e4
LT		 731
732/**
733 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
1da177e4
LT		 734 * @dev: ATA device to which the new command is attached
735 * @cmd: SCSI command that originated this ATA command
1da177e4
LT		 736 *
737 * Obtain a reference to an unused ata_queued_cmd structure,
738 * which is the basic libata structure representing a single
739 * ATA command sent to the hardware.
740 *
741 * If a command was available, fill in the SCSI-specific
742 * portions of the structure with information on the
743 * current command.
744 *
745 * LOCKING:
cca3974e 746 * spin_lock_irqsave(host lock)
1da177e4
LT		 747 *
748 * RETURNS:
749 * Command allocated, or %NULL if none available.
750 */
7102d230 751static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
b27dcfb0 752 struct scsi_cmnd *cmd)
1da177e4
LT		 753{
754 struct ata_queued_cmd *qc;
755
8a8bc223 756 qc = ata_qc_new_init(dev);
1da177e4
LT		 757 if (qc) {
758 qc->scsicmd = cmd;
b27dcfb0 759 qc->scsidone = cmd->scsi_done;
1da177e4 760
ff2aeb1e 761 qc->sg = scsi_sglist(cmd);
7120165c 762 qc->n_elem = scsi_sg_count(cmd);
1da177e4
LT		 763 } else {
764 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
b27dcfb0 765 cmd->scsi_done(cmd);
1da177e4
LT		 766 }
767
768 return qc;
769}
770
aacda375
TH		 771static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
772{
773 struct scsi_cmnd *scmd = qc->scsicmd;
774
775 qc->extrabytes = scmd->request->extra_len;
776 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
777}
778
b095518e
JG		 779/**
780 * ata_dump_status - user friendly display of error info
781 * @id: id of the port in question
782 * @tf: ptr to filled out taskfile
783 *
784 * Decode and dump the ATA error/status registers for the user so
785 * that they have some idea what really happened at the non
786 * make-believe layer.
787 *
788 * LOCKING:
789 * inherited from caller
790 */
7102d230 791static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
b095518e
JG		 792{
793 u8 stat = tf->command, err = tf->feature;
794
795 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
796 if (stat & ATA_BUSY) {
797 printk("Busy }\n"); /* Data is not valid in this case */
798 } else {
799 if (stat & 0x40) printk("DriveReady ");
800 if (stat & 0x20) printk("DeviceFault ");
801 if (stat & 0x10) printk("SeekComplete ");
802 if (stat & 0x08) printk("DataRequest ");
803 if (stat & 0x04) printk("CorrectedError ");
804 if (stat & 0x02) printk("Index ");
805 if (stat & 0x01) printk("Error ");
806 printk("}\n");
807
808 if (err) {
809 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
810 if (err & 0x04) printk("DriveStatusError ");
811 if (err & 0x80) {
812 if (err & 0x04) printk("BadCRC ");
813 else printk("Sector ");
814 }
815 if (err & 0x40) printk("UncorrectableError ");
816 if (err & 0x10) printk("SectorIdNotFound ");
817 if (err & 0x02) printk("TrackZeroNotFound ");
818 if (err & 0x01) printk("AddrMarkNotFound ");
819 printk("}\n");
820 }
821 }
822}
823
1da177e4
LT		 824/**
825 * ata_to_sense_error - convert ATA error to SCSI error
8e8b77dd 826 * @id: ATA device number
1da177e4 827 * @drv_stat: value contained in ATA status register
b095518e
JG		 828 * @drv_err: value contained in ATA error register
829 * @sk: the sense key we'll fill out
830 * @asc: the additional sense code we'll fill out
831 * @ascq: the additional sense code qualifier we'll fill out
246619da 832 * @verbose: be verbose
1da177e4 833 *
b095518e
JG		 834 * Converts an ATA error into a SCSI error. Fill out pointers to
835 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
836 * format sense blocks.
1da177e4
LT		 837 *
838 * LOCKING:
cca3974e 839 * spin_lock_irqsave(host lock)
1da177e4 840 */
7102d230
AB		 841static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
842 u8 *asc, u8 *ascq, int verbose)
1da177e4 843{
b095518e 844 int i;
ffe75ef6 845
1da177e4 846 /* Based on the 3ware driver translation table */
98ac62de 847 static const unsigned char sense_table[][4] = {
1da177e4
LT		 848 /* BBD|ECC|ID|MAR */
849 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
850 /* BBD|ECC|ID */
851 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
852 /* ECC|MC|MARK */
853 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
854 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
855 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
856 /* MC|ID|ABRT|TRK0|MARK */
857 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
858 /* MCR|MARK */
859 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
860 /* Bad address mark */
861 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
862 /* TRK0 */
863 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
864 /* Abort & !ICRC */
865 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
866 /* Media change request */
867 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
868 /* SRV */
869 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
870 /* Media change */
871 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
872 /* ECC */
873 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
874 /* BBD - block marked bad */
875 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
876 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
877 };
98ac62de 878 static const unsigned char stat_table[][4] = {
1da177e4
LT		 879 /* Must be first because BUSY means no other bits valid */
880 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
881 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
882 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
883 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
884 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
885 };
1da177e4 886
1da177e4
LT		 887 /*
888 * Is this an error we can process/parse
889 */
b095518e
JG		 890 if (drv_stat & ATA_BUSY) {
891 drv_err = 0; /* Ignore the err bits, they're invalid */
1da177e4 892 }
b095518e
JG		 893
894 if (drv_err) {
895 /* Look for drv_err */
896 for (i = 0; sense_table[i][0] != 0xFF; i++) {
897 /* Look for best matches first */
2e9edbf8 898 if ((sense_table[i][0] & drv_err) ==
b095518e
JG		 899 sense_table[i][0]) {
900 *sk = sense_table[i][1];
901 *asc = sense_table[i][2];
902 *ascq = sense_table[i][3];
903 goto translate_done;
904 }
905 }
906 /* No immediate match */
246619da
TH		 907 if (verbose)
908 printk(KERN_WARNING "ata%u: no sense translation for "
909 "error 0x%02x\n", id, drv_err);
1da177e4 910 }
b095518e
JG		 911
912 /* Fall back to interpreting status bits */
913 for (i = 0; stat_table[i][0] != 0xFF; i++) {
914 if (stat_table[i][0] & drv_stat) {
915 *sk = stat_table[i][1];
916 *asc = stat_table[i][2];
917 *ascq = stat_table[i][3];
918 goto translate_done;
1da177e4 919 }
b095518e
JG		 920 }
921 /* No error? Undecoded? */
246619da
TH		 922 if (verbose)
923 printk(KERN_WARNING "ata%u: no sense translation for "
924 "status: 0x%02x\n", id, drv_stat);
b095518e 925
2d202024
AC		 926 /* We need a sensible error return here, which is tricky, and one
927 that won't cause people to do things like return a disk wrongly */
928 *sk = ABORTED_COMMAND;
929 *asc = 0x00;
930 *ascq = 0x00;
b095518e
JG		 931
932 translate_done:
246619da
TH		 933 if (verbose)
934 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
935 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
936 id, drv_stat, drv_err, *sk, *asc, *ascq);
b095518e
JG		 937 return;
938}
939
940/*
750426aa 941 * ata_gen_passthru_sense - Generate check condition sense block.
b095518e
JG		 942 * @qc: Command that completed.
943 *
944 * This function is specific to the ATA descriptor format sense
945 * block specified for the ATA pass through commands. Regardless
946 * of whether the command errored or not, return a sense
947 * block. Copy all controller registers into the sense
84a9a8cd
GG		 948 * block. If there was no error, we get the request from an ATA
949 * passthrough command, so we use the following sense data:
950 * sk = RECOVERED ERROR
951 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
952 *
b095518e
JG		 953 *
954 * LOCKING:
750426aa 955 * None.
b095518e 956 */
750426aa 957static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
b095518e
JG		 958{
959 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 960 struct ata_taskfile *tf = &qc->result_tf;
b095518e
JG		 961 unsigned char *sb = cmd->sense_buffer;
962 unsigned char *desc = sb + 8;
246619da 963 int verbose = qc->ap->ops->error_handler == NULL;
b095518e
JG		 964
965 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
966
0e5dec47 967 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 968
b095518e
JG		 969 /*
970 * Use ata_to_sense_error() to map status register bits
971 * onto sense key, asc & ascq.
972 */
058e55e1
TH		 973 if (qc->err_mask ||
974 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
44877b4e 975 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
246619da 976 &sb[1], &sb[2], &sb[3], verbose);
b095518e 977 sb[1] &= 0x0f;
84a9a8cd
GG		 978 } else {
979 sb[1] = RECOVERED_ERROR;
980 sb[2] = 0;
981 sb[3] = 0x1D;
1da177e4
LT		 982 }
983
b095518e
JG		 984 /*
985 * Sense data is current and format is descriptor.
986 */
987 sb[0] = 0x72;
1da177e4 988
b095518e
JG		 989 desc[0] = 0x09;
990
f38621b3
TH		 991 /* set length of additional sense data */
992 sb[7] = 14;
993 desc[1] = 12;
b095518e
JG		 994
995 /*
996 * Copy registers into sense buffer.
997 */
998 desc[2] = 0x00;
999 desc[3] = tf->feature; /* == error reg */
1000 desc[5] = tf->nsect;
1001 desc[7] = tf->lbal;
1002 desc[9] = tf->lbam;
1003 desc[11] = tf->lbah;
1004 desc[12] = tf->device;
1005 desc[13] = tf->command; /* == status reg */
1006
1007 /*
1008 * Fill in Extend bit, and the high order bytes
1009 * if applicable.
1010 */
1011 if (tf->flags & ATA_TFLAG_LBA48) {
1012 desc[2] |= 0x01;
1013 desc[4] = tf->hob_nsect;
1014 desc[6] = tf->hob_lbal;
1015 desc[8] = tf->hob_lbam;
1016 desc[10] = tf->hob_lbah;
1da177e4 1017 }
b095518e 1018}
1da177e4 1019
b095518e 1020/**
750426aa 1021 * ata_gen_ata_sense - generate a SCSI fixed sense block
b095518e
JG		 1022 * @qc: Command that we are erroring out
1023 *
d25614ba 1024 * Generate sense block for a failed ATA command @qc. Descriptor
25985edc 1025 * format is used to accommodate LBA48 block address.
b095518e
JG		 1026 *
1027 * LOCKING:
750426aa 1028 * None.
b095518e 1029 */
750426aa 1030static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
b095518e 1031{
d25614ba 1032 struct ata_device *dev = qc->dev;
b095518e 1033 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 1034 struct ata_taskfile *tf = &qc->result_tf;
b095518e 1035 unsigned char *sb = cmd->sense_buffer;
d25614ba 1036 unsigned char *desc = sb + 8;
246619da 1037 int verbose = qc->ap->ops->error_handler == NULL;
d25614ba 1038 u64 block;
b095518e
JG		 1039
1040 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1041
0e5dec47 1042 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 1043
d25614ba
TH		 1044 /* sense data is current and format is descriptor */
1045 sb[0] = 0x72;
1046
1047 /* Use ata_to_sense_error() to map status register bits
b095518e
JG		 1048 * onto sense key, asc & ascq.
1049 */
058e55e1
TH		 1050 if (qc->err_mask ||
1051 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
44877b4e 1052 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
d25614ba
TH		 1053 &sb[1], &sb[2], &sb[3], verbose);
1054 sb[1] &= 0x0f;
1da177e4 1055 }
1da177e4 1056
d25614ba 1057 block = ata_tf_read_block(&qc->result_tf, dev);
a7dac447 1058
d25614ba
TH		 1059 /* information sense data descriptor */
1060 sb[7] = 12;
1061 desc[0] = 0x00;
1062 desc[1] = 10;
a7dac447 1063
d25614ba
TH		 1064 desc[2] |= 0x80; /* valid */
1065 desc[6] = block >> 40;
1066 desc[7] = block >> 32;
1067 desc[8] = block >> 24;
1068 desc[9] = block >> 16;
1069 desc[10] = block >> 8;
1070 desc[11] = block;
1da177e4
LT		 1071}
1072
a6cce2a7
BK		 1073static void ata_scsi_sdev_config(struct scsi_device *sdev)
1074{
1075 sdev->use_10_for_rw = 1;
1076 sdev->use_10_for_ms = 1;
3c6bdaea 1077 sdev->no_report_opcodes = 1;
5db44863 1078 sdev->no_write_same = 1;
31cc23b3
TH		 1079
1080 /* Schedule policy is determined by ->qc_defer() callback and
1081 * it needs to see every deferred qc. Set dev_blocked to 1 to
1082 * prevent SCSI midlayer from automatically deferring
1083 * requests.
1084 */
1085 sdev->max_device_blocked = 1;
a6cce2a7
BK		 1086}
1087
fa2fc7f4
JB		 1088/**
1089 * atapi_drain_needed - Check whether data transfer may overflow
73fd8b6d 1090 * @rq: request to be checked
fa2fc7f4
JB		 1091 *
1092 * ATAPI commands which transfer variable length data to host
1093 * might overflow due to application error or hardare bug. This
1094 * function checks whether overflow should be drained and ignored
1095 * for @request.
1096 *
1097 * LOCKING:
1098 * None.
1099 *
1100 * RETURNS:
1101 * 1 if ; otherwise, 0.
1102 */
1103static int atapi_drain_needed(struct request *rq)
1104{
33659ebb 1105 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
fa2fc7f4
JB		 1106 return 0;
1107
7b6d91da 1108 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
fa2fc7f4
JB		 1109 return 0;
1110
1111 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1112}
1113
1114static int ata_scsi_dev_config(struct scsi_device *sdev,
1115 struct ata_device *dev)
a6cce2a7 1116{
900e599e 1117 struct request_queue *q = sdev->request_queue;
1118
45fabbb7
EO		 1119 if (!ata_id_has_unload(dev->id))
1120 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1121
914ed354 1122 /* configure max sectors */
900e599e 1123 blk_queue_max_hw_sectors(q, dev->max_sectors);
a6cce2a7 1124
fa2fc7f4 1125 if (dev->class == ATA_DEV_ATAPI) {
fa2fc7f4
JB		 1126 void *buf;
1127
729a6a30
TH		 1128 sdev->sector_size = ATA_SECT_SIZE;
1129
1130 /* set DMA padding */
900e599e 1131 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
fa2fc7f4
JB		 1132
1133 /* configure draining */
1134 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1135 if (!buf) {
a9a79dfe 1136 ata_dev_err(dev, "drain buffer allocation failed\n");
fa2fc7f4
JB		 1137 return -ENOMEM;
1138 }
1139
1140 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1141 } else {
295124dc 1142 sdev->sector_size = ata_id_logical_sector_size(dev->id);
d8cf5389 1143 sdev->manage_start_stop = 1;
dde20207 1144 }
d8cf5389 1145
729a6a30
TH		 1146 /*
1147 * ata_pio_sectors() expects buffer for each sector to not cross
1148 * page boundary. Enforce it by requiring buffers to be sector
1149 * aligned, which works iff sector_size is not larger than
1150 * PAGE_SIZE. ATAPI devices also need the alignment as
1151 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1152 */
1153 if (sdev->sector_size > PAGE_SIZE)
a9a79dfe 1154 ata_dev_warn(dev,
729a6a30
TH		 1155 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1156 sdev->sector_size);
1157
900e599e 1158 blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
729a6a30 1159
f26792d5
JG		 1160 if (dev->flags & ATA_DFLAG_AN)
1161 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1162
a6e6ce8e
TH		 1163 if (dev->flags & ATA_DFLAG_NCQ) {
1164 int depth;
1165
1166 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1167 depth = min(ATA_MAX_QUEUE - 1, depth);
8a8bc223 1168 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
a6e6ce8e 1169 }
fa2fc7f4 1170
900e599e 1171 blk_queue_flush_queueable(q, false);
1172
295124dc 1173 dev->sdev = sdev;
fa2fc7f4 1174 return 0;
a6cce2a7
BK		 1175}
1176
1da177e4
LT		 1177/**
1178 * ata_scsi_slave_config - Set SCSI device attributes
1179 * @sdev: SCSI device to examine
1180 *
1181 * This is called before we actually start reading
1182 * and writing to the device, to configure certain
1183 * SCSI mid-layer behaviors.
1184 *
1185 * LOCKING:
1186 * Defined by SCSI layer. We don't really care.
1187 */
1188
1189int ata_scsi_slave_config(struct scsi_device *sdev)
1190{
31534363
TH		 1191 struct ata_port *ap = ata_shost_to_port(sdev->host);
1192 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
fa2fc7f4 1193 int rc = 0;
31534363 1194
a6cce2a7 1195 ata_scsi_sdev_config(sdev);
1da177e4 1196
31534363 1197 if (dev)
fa2fc7f4 1198 rc = ata_scsi_dev_config(sdev, dev);
1da177e4 1199
fa2fc7f4 1200 return rc;
1da177e4
LT		 1201}
1202
83c47bcb
TH		 1203/**
1204 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1205 * @sdev: SCSI device to be destroyed
1206 *
1207 * @sdev is about to be destroyed for hot/warm unplugging. If
1208 * this unplugging was initiated by libata as indicated by NULL
1209 * dev->sdev, this function doesn't have to do anything.
1210 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1211 * Clear dev->sdev, schedule the device for ATA detach and invoke
1212 * EH.
1213 *
1214 * LOCKING:
1215 * Defined by SCSI layer. We don't really care.
1216 */
1217void ata_scsi_slave_destroy(struct scsi_device *sdev)
1218{
1219 struct ata_port *ap = ata_shost_to_port(sdev->host);
fa2fc7f4 1220 struct request_queue *q = sdev->request_queue;
83c47bcb
TH		 1221 unsigned long flags;
1222 struct ata_device *dev;
1223
1224 if (!ap->ops->error_handler)
1225 return;
1226
ba6a1308 1227 spin_lock_irqsave(ap->lock, flags);
83c47bcb
TH		 1228 dev = __ata_scsi_find_dev(ap, sdev);
1229 if (dev && dev->sdev) {
1230 /* SCSI device already in CANCEL state, no need to offline it */
1231 dev->sdev = NULL;
1232 dev->flags |= ATA_DFLAG_DETACH;
1233 ata_port_schedule_eh(ap);
1234 }
ba6a1308 1235 spin_unlock_irqrestore(ap->lock, flags);
fa2fc7f4
JB		 1236
1237 kfree(q->dma_drain_buffer);
1238 q->dma_drain_buffer = NULL;
1239 q->dma_drain_size = 0;
83c47bcb
TH		 1240}
1241
a6e6ce8e 1242/**
f6e67035 1243 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
6d2dd054
MPS		 1244 * @ap: ATA port to which the device change the queue depth
1245 * @sdev: SCSI device to configure queue depth for
1246 * @queue_depth: new queue depth
1247 * @reason: calling context
a6e6ce8e 1248 *
f6e67035
DW		 1249 * libsas and libata have different approaches for associating a sdev to
1250 * its ata_port.
a6e6ce8e 1251 *
a6e6ce8e 1252 */
f6e67035
DW		 1253int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
1254 int queue_depth, int reason)
a6e6ce8e 1255{
a6e6ce8e 1256 struct ata_device *dev;
360f654e 1257 unsigned long flags;
a6e6ce8e 1258
e881a172
MC		 1259 if (reason != SCSI_QDEPTH_DEFAULT)
1260 return -EOPNOTSUPP;
1261
c3c70c44 1262 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
a6e6ce8e
TH		 1263 return sdev->queue_depth;
1264
1265 dev = ata_scsi_find_dev(ap, sdev);
1266 if (!dev || !ata_dev_enabled(dev))
1267 return sdev->queue_depth;
1268
c3c70c44 1269 /* NCQ enabled? */
360f654e 1270 spin_lock_irqsave(ap->lock, flags);
c3c70c44
TH		 1271 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1272 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
360f654e 1273 dev->flags |= ATA_DFLAG_NCQ_OFF;
c3c70c44
TH		 1274 queue_depth = 1;
1275 }
360f654e
TH		 1276 spin_unlock_irqrestore(ap->lock, flags);
1277
c3c70c44
TH		 1278 /* limit and apply queue depth */
1279 queue_depth = min(queue_depth, sdev->host->can_queue);
1280 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1281 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1282
1283 if (sdev->queue_depth == queue_depth)
1284 return -EINVAL;
1285
1286 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
a6e6ce8e
TH		 1287 return queue_depth;
1288}
1289
f6e67035
DW		 1290/**
1291 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1292 * @sdev: SCSI device to configure queue depth for
1293 * @queue_depth: new queue depth
1294 * @reason: calling context
1295 *
1296 * This is libata standard hostt->change_queue_depth callback.
1297 * SCSI will call into this callback when user tries to set queue
1298 * depth via sysfs.
1299 *
1300 * LOCKING:
1301 * SCSI layer (we don't care)
1302 *
1303 * RETURNS:
1304 * Newly configured queue depth.
1305 */
1306int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth,
1307 int reason)
1308{
1309 struct ata_port *ap = ata_shost_to_port(sdev->host);
1310
1311 return __ata_change_queue_depth(ap, sdev, queue_depth, reason);
1312}
1313
972dcafb
DG		 1314/**
1315 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1316 * @qc: Storage for translated ATA taskfile
972dcafb
DG		 1317 *
1318 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1319 * (to start). Perhaps these commands should be preceded by
1320 * CHECK POWER MODE to see what power mode the device is already in.
1321 * [See SAT revision 5 at www.t10.org]
1322 *
1323 * LOCKING:
cca3974e 1324 * spin_lock_irqsave(host lock)
972dcafb
DG		 1325 *
1326 * RETURNS:
1327 * Zero on success, non-zero on error.
1328 */
ad706991 1329static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
972dcafb 1330{
542b1444 1331 struct scsi_cmnd *scmd = qc->scsicmd;
972dcafb 1332 struct ata_taskfile *tf = &qc->tf;
ad706991 1333 const u8 *cdb = scmd->cmnd;
972dcafb 1334
2e5704f6
TH		 1335 if (scmd->cmd_len < 5)
1336 goto invalid_fld;
1337
972dcafb
DG		 1338 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1339 tf->protocol = ATA_PROT_NODATA;
542b1444 1340 if (cdb[1] & 0x1) {
972dcafb
DG		 1341 ; /* ignore IMMED bit, violates sat-r05 */
1342 }
542b1444 1343 if (cdb[4] & 0x2)
ae006510 1344 goto invalid_fld; /* LOEJ bit set not supported */
542b1444 1345 if (((cdb[4] >> 4) & 0xf) != 0)
ae006510 1346 goto invalid_fld; /* power conditions not supported */
e31e8531 1347
542b1444 1348 if (cdb[4] & 0x1) {
972dcafb 1349 tf->nsect = 1; /* 1 sector, lba=0 */
9d5b1302
AL		 1350
1351 if (qc->dev->flags & ATA_DFLAG_LBA) {
c44078c0 1352 tf->flags |= ATA_TFLAG_LBA;
9d5b1302
AL		 1353
1354 tf->lbah = 0x0;
1355 tf->lbam = 0x0;
1356 tf->lbal = 0x0;
1357 tf->device |= ATA_LBA;
1358 } else {
1359 /* CHS */
1360 tf->lbal = 0x1; /* sect */
1361 tf->lbam = 0x0; /* cyl low */
1362 tf->lbah = 0x0; /* cyl high */
1363 }
1364
972dcafb 1365 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
920a4b10 1366 } else {
2a6e58d2
RW		 1367 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1368 * or S5) causing some drives to spin up and down again.
1369 */
1370 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1371 system_state == SYSTEM_POWER_OFF)
1372 goto skip;
1373
1374 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1375 system_entering_hibernation())
1376 goto skip;
1377
78981a7c
RH		 1378 /* Issue ATA STANDBY IMMEDIATE command */
1379 tf->command = ATA_CMD_STANDBYNOW1;
920a4b10 1380 }
78981a7c 1381
972dcafb
DG		 1382 /*
1383 * Standby and Idle condition timers could be implemented but that
1384 * would require libata to implement the Power condition mode page
1385 * and allow the user to change it. Changing mode pages requires
1386 * MODE SELECT to be implemented.
1387 */
1388
1389 return 0;
ae006510 1390
2a6e58d2 1391 invalid_fld:
542b1444 1392 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1393 /* "Invalid field in cbd" */
1394 return 1;
2a6e58d2
RW		 1395 skip:
1396 scmd->result = SAM_STAT_GOOD;
1397 return 1;
972dcafb
DG		 1398}
1399
1400
1da177e4
LT		 1401/**
1402 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1403 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1404 *
1405 * Sets up an ATA taskfile to issue FLUSH CACHE or
1406 * FLUSH CACHE EXT.
1407 *
1408 * LOCKING:
cca3974e 1409 * spin_lock_irqsave(host lock)
1da177e4
LT		 1410 *
1411 * RETURNS:
1412 * Zero on success, non-zero on error.
1413 */
ad706991 1414static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1da177e4
LT		 1415{
1416 struct ata_taskfile *tf = &qc->tf;
1417
1418 tf->flags |= ATA_TFLAG_DEVICE;
1419 tf->protocol = ATA_PROT_NODATA;
1420
6fc49adb 1421 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1da177e4
LT		 1422 tf->command = ATA_CMD_FLUSH_EXT;
1423 else
1424 tf->command = ATA_CMD_FLUSH;
1425
b666da35
TH		 1426 /* flush is critical for IO integrity, consider it an IO command */
1427 qc->flags |= ATA_QCFLAG_IO;
1428
1da177e4
LT		 1429 return 0;
1430}
1431
3aef5231
AL		 1432/**
1433 * scsi_6_lba_len - Get LBA and transfer length
542b1444 1434 * @cdb: SCSI command to translate
3aef5231
AL		 1435 *
1436 * Calculate LBA and transfer length for 6-byte commands.
1437 *
1438 * RETURNS:
1439 * @plba: the LBA
1440 * @plen: the transfer length
1441 */
542b1444 1442static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1443{
1444 u64 lba = 0;
6c7b7d2b 1445 u32 len;
3aef5231
AL		 1446
1447 VPRINTK("six-byte command\n");
1448
6c7b7d2b 1449 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
542b1444
TH		 1450 lba |= ((u64)cdb[2]) << 8;
1451 lba |= ((u64)cdb[3]);
3aef5231 1452
6c7b7d2b 1453 len = cdb[4];
3aef5231
AL		 1454
1455 *plba = lba;
1456 *plen = len;
1457}
1458
1459/**
1460 * scsi_10_lba_len - Get LBA and transfer length
542b1444 1461 * @cdb: SCSI command to translate
3aef5231
AL		 1462 *
1463 * Calculate LBA and transfer length for 10-byte commands.
1464 *
1465 * RETURNS:
1466 * @plba: the LBA
1467 * @plen: the transfer length
1468 */
542b1444 1469static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1470{
1471 u64 lba = 0;
1472 u32 len = 0;
1473
1474 VPRINTK("ten-byte command\n");
1475
542b1444
TH		 1476 lba |= ((u64)cdb[2]) << 24;
1477 lba |= ((u64)cdb[3]) << 16;
1478 lba |= ((u64)cdb[4]) << 8;
1479 lba |= ((u64)cdb[5]);
3aef5231 1480
542b1444
TH		 1481 len |= ((u32)cdb[7]) << 8;
1482 len |= ((u32)cdb[8]);
3aef5231
AL		 1483
1484 *plba = lba;
1485 *plen = len;
1486}
1487
1488/**
1489 * scsi_16_lba_len - Get LBA and transfer length
542b1444 1490 * @cdb: SCSI command to translate
3aef5231
AL		 1491 *
1492 * Calculate LBA and transfer length for 16-byte commands.
1493 *
1494 * RETURNS:
1495 * @plba: the LBA
1496 * @plen: the transfer length
1497 */
542b1444 1498static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1499{
1500 u64 lba = 0;
1501 u32 len = 0;
1502
1503 VPRINTK("sixteen-byte command\n");
1504
542b1444
TH		 1505 lba |= ((u64)cdb[2]) << 56;
1506 lba |= ((u64)cdb[3]) << 48;
1507 lba |= ((u64)cdb[4]) << 40;
1508 lba |= ((u64)cdb[5]) << 32;
1509 lba |= ((u64)cdb[6]) << 24;
1510 lba |= ((u64)cdb[7]) << 16;
1511 lba |= ((u64)cdb[8]) << 8;
1512 lba |= ((u64)cdb[9]);
3aef5231 1513
542b1444
TH		 1514 len |= ((u32)cdb[10]) << 24;
1515 len |= ((u32)cdb[11]) << 16;
1516 len |= ((u32)cdb[12]) << 8;
1517 len |= ((u32)cdb[13]);
3aef5231
AL		 1518
1519 *plba = lba;
1520 *plen = len;
1521}
1522
1da177e4
LT		 1523/**
1524 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1525 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1526 *
1527 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1528 *
1529 * LOCKING:
cca3974e 1530 * spin_lock_irqsave(host lock)
1da177e4
LT		 1531 *
1532 * RETURNS:
1533 * Zero on success, non-zero on error.
1534 */
ad706991 1535static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1da177e4 1536{
542b1444 1537 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4 1538 struct ata_taskfile *tf = &qc->tf;
8bf62ece 1539 struct ata_device *dev = qc->dev;
1da177e4 1540 u64 dev_sectors = qc->dev->n_sectors;
ad706991 1541 const u8 *cdb = scmd->cmnd;
3aef5231
AL		 1542 u64 block;
1543 u32 n_block;
1da177e4
LT		 1544
1545 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1546 tf->protocol = ATA_PROT_NODATA;
1da177e4 1547
2e5704f6
TH		 1548 if (cdb[0] == VERIFY) {
1549 if (scmd->cmd_len < 10)
1550 goto invalid_fld;
542b1444 1551 scsi_10_lba_len(cdb, &block, &n_block);
2e5704f6
TH		 1552 } else if (cdb[0] == VERIFY_16) {
1553 if (scmd->cmd_len < 16)
1554 goto invalid_fld;
542b1444 1555 scsi_16_lba_len(cdb, &block, &n_block);
2e5704f6 1556 } else
ae006510 1557 goto invalid_fld;
1da177e4 1558
8bf62ece 1559 if (!n_block)
ae006510 1560 goto nothing_to_do;
8bf62ece 1561 if (block >= dev_sectors)
ae006510 1562 goto out_of_range;
8bf62ece 1563 if ((block + n_block) > dev_sectors)
ae006510 1564 goto out_of_range;
1da177e4 1565
07506697
AL		 1566 if (dev->flags & ATA_DFLAG_LBA) {
1567 tf->flags |= ATA_TFLAG_LBA;
1568
c6a33e24
AL		 1569 if (lba_28_ok(block, n_block)) {
1570 /* use LBA28 */
1571 tf->command = ATA_CMD_VERIFY;
1572 tf->device |= (block >> 24) & 0xf;
1573 } else if (lba_48_ok(block, n_block)) {
1574 if (!(dev->flags & ATA_DFLAG_LBA48))
1575 goto out_of_range;
07506697
AL		 1576
1577 /* use LBA48 */
1578 tf->flags |= ATA_TFLAG_LBA48;
8bf62ece 1579 tf->command = ATA_CMD_VERIFY_EXT;
1da177e4 1580
8bf62ece 1581 tf->hob_nsect = (n_block >> 8) & 0xff;
1da177e4 1582
8bf62ece
AL		 1583 tf->hob_lbah = (block >> 40) & 0xff;
1584 tf->hob_lbam = (block >> 32) & 0xff;
1585 tf->hob_lbal = (block >> 24) & 0xff;
c6a33e24
AL		 1586 } else
1587 /* request too large even for LBA48 */
1588 goto out_of_range;
8bf62ece
AL		 1589
1590 tf->nsect = n_block & 0xff;
1da177e4 1591
8bf62ece
AL		 1592 tf->lbah = (block >> 16) & 0xff;
1593 tf->lbam = (block >> 8) & 0xff;
1594 tf->lbal = block & 0xff;
1da177e4 1595
8bf62ece
AL		 1596 tf->device |= ATA_LBA;
1597 } else {
1598 /* CHS */
1599 u32 sect, head, cyl, track;
1600
c6a33e24
AL		 1601 if (!lba_28_ok(block, n_block))
1602 goto out_of_range;
07506697 1603
8bf62ece
AL		 1604 /* Convert LBA to CHS */
1605 track = (u32)block / dev->sectors;
1606 cyl = track / dev->heads;
1607 head = track % dev->heads;
1608 sect = (u32)block % dev->sectors + 1;
1609
c187c4b5
AL		 1610 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1611 (u32)block, track, cyl, head, sect);
2e9edbf8
JG		 1612
1613 /* Check whether the converted CHS can fit.
1614 Cylinder: 0-65535
8bf62ece
AL		 1615 Head: 0-15
1616 Sector: 1-255*/
2e9edbf8 1617 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
ae006510 1618 goto out_of_range;
2e9edbf8 1619
8bf62ece
AL		 1620 tf->command = ATA_CMD_VERIFY;
1621 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1622 tf->lbal = sect;
1623 tf->lbam = cyl;
1624 tf->lbah = cyl >> 8;
1625 tf->device |= head;
1626 }
1da177e4
LT		 1627
1628 return 0;
ae006510
DG		 1629
1630invalid_fld:
542b1444 1631 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1632 /* "Invalid field in cbd" */
1633 return 1;
1634
1635out_of_range:
542b1444 1636 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1637 /* "Logical Block Address out of range" */
1638 return 1;
1639
1640nothing_to_do:
542b1444 1641 scmd->result = SAM_STAT_GOOD;
ae006510 1642 return 1;
1da177e4
LT		 1643}
1644
1645/**
1646 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1647 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1648 *
1649 * Converts any of six SCSI read/write commands into the
1650 * ATA counterpart, including starting sector (LBA),
1651 * sector count, and taking into account the device's LBA48
1652 * support.
1653 *
1654 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1655 * %WRITE_16 are currently supported.
1656 *
1657 * LOCKING:
cca3974e 1658 * spin_lock_irqsave(host lock)
1da177e4
LT		 1659 *
1660 * RETURNS:
1661 * Zero on success, non-zero on error.
1662 */
ad706991 1663static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1da177e4 1664{
542b1444 1665 struct scsi_cmnd *scmd = qc->scsicmd;
ad706991 1666 const u8 *cdb = scmd->cmnd;
bd056d7e 1667 unsigned int tf_flags = 0;
3aef5231
AL		 1668 u64 block;
1669 u32 n_block;
bd056d7e 1670 int rc;
1da177e4 1671
542b1444 1672 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
bd056d7e 1673 tf_flags |= ATA_TFLAG_WRITE;
1da177e4 1674
9a3dccc4 1675 /* Calculate the SCSI LBA, transfer length and FUA. */
542b1444 1676 switch (cdb[0]) {
3aef5231
AL		 1677 case READ_10:
1678 case WRITE_10:
2e5704f6
TH		 1679 if (unlikely(scmd->cmd_len < 10))
1680 goto invalid_fld;
542b1444 1681 scsi_10_lba_len(cdb, &block, &n_block);
3e451a49 1682 if (cdb[1] & (1 << 3))
bd056d7e 1683 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1684 break;
1685 case READ_6:
1686 case WRITE_6:
2e5704f6
TH		 1687 if (unlikely(scmd->cmd_len < 6))
1688 goto invalid_fld;
542b1444 1689 scsi_6_lba_len(cdb, &block, &n_block);
c187c4b5
AL		 1690
1691 /* for 6-byte r/w commands, transfer length 0
1692 * means 256 blocks of data, not 0 block.
1693 */
76b2bf9b
JG		 1694 if (!n_block)
1695 n_block = 256;
3aef5231
AL		 1696 break;
1697 case READ_16:
1698 case WRITE_16:
2e5704f6
TH		 1699 if (unlikely(scmd->cmd_len < 16))
1700 goto invalid_fld;
542b1444 1701 scsi_16_lba_len(cdb, &block, &n_block);
3e451a49 1702 if (cdb[1] & (1 << 3))
bd056d7e 1703 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1704 break;
1705 default:
8bf62ece 1706 DPRINTK("no-byte command\n");
ae006510 1707 goto invalid_fld;
1da177e4
LT		 1708 }
1709
8bf62ece
AL		 1710 /* Check and compose ATA command */
1711 if (!n_block)
c187c4b5
AL		 1712 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1713 * length 0 means transfer 0 block of data.
1714 * However, for ATA R/W commands, sector count 0 means
1715 * 256 or 65536 sectors, not 0 sectors as in SCSI.
f51750d5
AC		 1716 *
1717 * WARNING: one or two older ATA drives treat 0 as 0...
c187c4b5 1718 */
ae006510 1719 goto nothing_to_do;
1da177e4 1720
bd056d7e 1721 qc->flags |= ATA_QCFLAG_IO;
295124dc 1722 qc->nbytes = n_block * scmd->device->sector_size;
1da177e4 1723
bd056d7e
TH		 1724 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1725 qc->tag);
1726 if (likely(rc == 0))
1727 return 0;
ae006510 1728
bd056d7e
TH		 1729 if (rc == -ERANGE)
1730 goto out_of_range;
1731 /* treat all other errors as -EINVAL, fall through */
ae006510 1732invalid_fld:
542b1444 1733 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1734 /* "Invalid field in cbd" */
1735 return 1;
1736
1737out_of_range:
542b1444 1738 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1739 /* "Logical Block Address out of range" */
1740 return 1;
1741
1742nothing_to_do:
542b1444 1743 scmd->result = SAM_STAT_GOOD;
ae006510 1744 return 1;
1da177e4
LT		 1745}
1746
77853bf2 1747static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1da177e4 1748{
c31f571d 1749 struct ata_port *ap = qc->ap;
1da177e4 1750 struct scsi_cmnd *cmd = qc->scsicmd;
a7dac447 1751 u8 *cdb = cmd->cmnd;
2dcb407e 1752 int need_sense = (qc->err_mask != 0);
b095518e
JG		 1753
1754 /* For ATA pass thru (SAT) commands, generate a sense block if
1755 * user mandated it or if there's an error. Note that if we
84a9a8cd
GG		 1756 * generate because the user forced us to [CK_COND =1], a check
1757 * condition is generated and the ATA register values are returned
b095518e 1758 * whether the command completed successfully or not. If there
84a9a8cd
GG		 1759 * was no error, we use the following sense data:
1760 * sk = RECOVERED ERROR
1761 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
b095518e 1762 */
a7dac447 1763 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
2dcb407e 1764 ((cdb[2] & 0x20) || need_sense)) {
750426aa 1765 ata_gen_passthru_sense(qc);
b095518e
JG		 1766 } else {
1767 if (!need_sense) {
1768 cmd->result = SAM_STAT_GOOD;
1769 } else {
1770 /* TODO: decide which descriptor format to use
1771 * for 48b LBA devices and call that here
1772 * instead of the fixed desc, which is only
1773 * good for smaller LBA (and maybe CHS?)
1774 * devices.
1775 */
750426aa 1776 ata_gen_ata_sense(qc);
b095518e
JG		 1777 }
1778 }
1da177e4 1779
c31f571d 1780 if (need_sense && !ap->ops->error_handler)
44877b4e 1781 ata_dump_status(ap->print_id, &qc->result_tf);
1da177e4
LT		 1782
1783 qc->scsidone(cmd);
1784
77853bf2 1785 ata_qc_free(qc);
1da177e4
LT		 1786}
1787
1788/**
1789 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1da177e4
LT		 1790 * @dev: ATA device to which the command is addressed
1791 * @cmd: SCSI command to execute
1da177e4
LT		 1792 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1793 *
1794 * Our ->queuecommand() function has decided that the SCSI
1795 * command issued can be directly translated into an ATA
1796 * command, rather than handled internally.
1797 *
1798 * This function sets up an ata_queued_cmd structure for the
1799 * SCSI command, and sends that ata_queued_cmd to the hardware.
1800 *
ae006510
DG		 1801 * The xlat_func argument (actor) returns 0 if ready to execute
1802 * ATA command, else 1 to finish translation. If 1 is returned
1803 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1804 * to be set reflecting an error condition or clean (early)
1805 * termination.
1806 *
1da177e4 1807 * LOCKING:
cca3974e 1808 * spin_lock_irqsave(host lock)
2115ea94
TH		 1809 *
1810 * RETURNS:
1811 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1812 * needs to be deferred.
1da177e4 1813 */
2115ea94 1814static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
2115ea94 1815 ata_xlat_func_t xlat_func)
1da177e4 1816{
31cc23b3 1817 struct ata_port *ap = dev->link->ap;
1da177e4 1818 struct ata_queued_cmd *qc;
31cc23b3 1819 int rc;
1da177e4
LT		 1820
1821 VPRINTK("ENTER\n");
1822
b27dcfb0 1823 qc = ata_scsi_qc_new(dev, cmd);
1da177e4 1824 if (!qc)
ae006510 1825 goto err_mem;
1da177e4
LT		 1826
1827 /* data is present; dma-map it */
be7db055
CH		 1828 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1829 cmd->sc_data_direction == DMA_TO_DEVICE) {
7120165c 1830 if (unlikely(scsi_bufflen(cmd) < 1)) {
a9a79dfe 1831 ata_dev_warn(dev, "WARNING: zero len r/w req\n");
ae006510 1832 goto err_did;
1da177e4
LT		 1833 }
1834
7120165c 1835 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1da177e4
LT		 1836
1837 qc->dma_dir = cmd->sc_data_direction;
1838 }
1839
1840 qc->complete_fn = ata_scsi_qc_complete;
1841
ad706991 1842 if (xlat_func(qc))
ae006510 1843 goto early_finish;
1da177e4 1844
31cc23b3
TH		 1845 if (ap->ops->qc_defer) {
1846 if ((rc = ap->ops->qc_defer(qc)))
1847 goto defer;
1848 }
1849
1da177e4 1850 /* select device, send command to hardware */
8e0e694a 1851 ata_qc_issue(qc);
1da177e4
LT		 1852
1853 VPRINTK("EXIT\n");
2115ea94 1854 return 0;
1da177e4 1855
ae006510 1856early_finish:
2dcb407e 1857 ata_qc_free(qc);
b27dcfb0 1858 cmd->scsi_done(cmd);
ae006510 1859 DPRINTK("EXIT - early finish (good or error)\n");
2115ea94 1860 return 0;
ae006510
DG		 1861
1862err_did:
1da177e4 1863 ata_qc_free(qc);
ae006510 1864 cmd->result = (DID_ERROR << 16);
b27dcfb0 1865 cmd->scsi_done(cmd);
253b92ec 1866err_mem:
ae006510 1867 DPRINTK("EXIT - internal\n");
2115ea94 1868 return 0;
3dc1d881
TH		 1869
1870defer:
31cc23b3 1871 ata_qc_free(qc);
3dc1d881 1872 DPRINTK("EXIT - defer\n");
31cc23b3
TH		 1873 if (rc == ATA_DEFER_LINK)
1874 return SCSI_MLQUEUE_DEVICE_BUSY;
1875 else
1876 return SCSI_MLQUEUE_HOST_BUSY;
1da177e4
LT		 1877}
1878
1879/**
1880 * ata_scsi_rbuf_get - Map response buffer.
ec2a20e6 1881 * @cmd: SCSI command containing buffer to be mapped.
87340e98
TH		 1882 * @flags: unsigned long variable to store irq enable status
1883 * @copy_in: copy in from user buffer
1da177e4 1884 *
87340e98 1885 * Prepare buffer for simulated SCSI commands.
1da177e4
LT		 1886 *
1887 * LOCKING:
87340e98 1888 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1da177e4
LT		 1889 *
1890 * RETURNS:
87340e98 1891 * Pointer to response buffer.
1da177e4 1892 */
87340e98
TH		 1893static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1894 unsigned long *flags)
1da177e4 1895{
87340e98 1896 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1da177e4 1897
87340e98
TH		 1898 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1899 if (copy_in)
1900 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1901 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1902 return ata_scsi_rbuf;
1da177e4
LT		 1903}
1904
1905/**
1906 * ata_scsi_rbuf_put - Unmap response buffer.
1907 * @cmd: SCSI command containing buffer to be unmapped.
87340e98
TH		 1908 * @copy_out: copy out result
1909 * @flags: @flags passed to ata_scsi_rbuf_get()
1da177e4 1910 *
87340e98
TH		 1911 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1912 * @copy_back is true.
1da177e4
LT		 1913 *
1914 * LOCKING:
87340e98 1915 * Unlocks ata_scsi_rbuf_lock.
1da177e4 1916 */
87340e98
TH		 1917static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1918 unsigned long *flags)
1da177e4 1919{
87340e98
TH		 1920 if (copy_out)
1921 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1922 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1923 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1da177e4
LT		 1924}
1925
1926/**
1927 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1928 * @args: device IDENTIFY data / SCSI command of interest.
1929 * @actor: Callback hook for desired SCSI command simulator
1930 *
1931 * Takes care of the hard work of simulating a SCSI command...
1932 * Mapping the response buffer, calling the command's handler,
1933 * and handling the handler's return value. This return value
1934 * indicates whether the handler wishes the SCSI command to be
ae006510
DG		 1935 * completed successfully (0), or not (in which case cmd->result
1936 * and sense buffer are assumed to be set).
1da177e4
LT		 1937 *
1938 * LOCKING:
cca3974e 1939 * spin_lock_irqsave(host lock)
1da177e4 1940 */
f0761be3 1941static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
87340e98 1942 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1da177e4
LT		 1943{
1944 u8 *rbuf;
87340e98 1945 unsigned int rc;
1da177e4 1946 struct scsi_cmnd *cmd = args->cmd;
b445c568
JG		 1947 unsigned long flags;
1948
87340e98
TH		 1949 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1950 rc = actor(args, rbuf);
1951 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
b445c568 1952
ae006510 1953 if (rc == 0)
1da177e4 1954 cmd->result = SAM_STAT_GOOD;
ae006510 1955 args->done(cmd);
1da177e4
LT		 1956}
1957
1958/**
1959 * ata_scsiop_inq_std - Simulate INQUIRY command
1960 * @args: device IDENTIFY data / SCSI command of interest.
1961 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 1962 *
1963 * Returns standard device identification data associated
b142eb65 1964 * with non-VPD INQUIRY command output.
1da177e4
LT		 1965 *
1966 * LOCKING:
cca3974e 1967 * spin_lock_irqsave(host lock)
1da177e4 1968 */
87340e98 1969static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 1970{
87340e98
TH		 1971 const u8 versions[] = {
1972 0x60, /* SAM-3 (no version claimed) */
1973
1974 0x03,
1975 0x20, /* SBC-2 (no version claimed) */
1976
1977 0x02,
1978 0x60 /* SPC-3 (no version claimed) */
1979 };
1da177e4
LT		 1980 u8 hdr[] = {
1981 TYPE_DISK,
1982 0,
1983 0x5, /* claim SPC-3 version compatibility */
1984 2,
1985 95 - 4
1986 };
1987
87340e98
TH		 1988 VPRINTK("ENTER\n");
1989
1da177e4
LT		 1990 /* set scsi removeable (RMB) bit per ata bit */
1991 if (ata_id_removeable(args->id))
1992 hdr[1] |= (1 << 7);
1993
1da177e4 1994 memcpy(rbuf, hdr, sizeof(hdr));
87340e98
TH		 1995 memcpy(&rbuf[8], "ATA ", 8);
1996 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1997 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1da177e4 1998
87340e98
TH		 1999 if (rbuf[32] == 0 || rbuf[32] == ' ')
2000 memcpy(&rbuf[32], "n/a ", 4);
1da177e4 2001
87340e98 2002 memcpy(rbuf + 59, versions, sizeof(versions));
1da177e4
LT		 2003
2004 return 0;
2005}
2006
2007/**
b142eb65 2008 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1da177e4
LT		 2009 * @args: device IDENTIFY data / SCSI command of interest.
2010 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2011 *
b142eb65 2012 * Returns list of inquiry VPD pages available.
1da177e4
LT		 2013 *
2014 * LOCKING:
cca3974e 2015 * spin_lock_irqsave(host lock)
1da177e4 2016 */
87340e98 2017static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2018{
2019 const u8 pages[] = {
2020 0x00, /* page 0x00, this page */
2021 0x80, /* page 0x80, unit serial no page */
1e9dbc92
MW		 2022 0x83, /* page 0x83, device ident page */
2023 0x89, /* page 0x89, ata info page */
18f0f978 2024 0xb0, /* page 0xb0, block limits page */
1e9dbc92 2025 0xb1, /* page 0xb1, block device characteristics page */
02e0a604 2026 0xb2, /* page 0xb2, thin provisioning page */
1da177e4 2027 };
1da177e4 2028
87340e98
TH		 2029 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
2030 memcpy(rbuf + 4, pages, sizeof(pages));
1da177e4
LT		 2031 return 0;
2032}
2033
2034/**
b142eb65 2035 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1da177e4
LT		 2036 * @args: device IDENTIFY data / SCSI command of interest.
2037 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2038 *
2039 * Returns ATA device serial number.
2040 *
2041 * LOCKING:
cca3974e 2042 * spin_lock_irqsave(host lock)
1da177e4 2043 */
87340e98 2044static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2045{
2046 const u8 hdr[] = {
2047 0,
2048 0x80, /* this page code */
2049 0,
a0cf733b 2050 ATA_ID_SERNO_LEN, /* page len */
1da177e4 2051 };
1da177e4 2052
87340e98
TH		 2053 memcpy(rbuf, hdr, sizeof(hdr));
2054 ata_id_string(args->id, (unsigned char *) &rbuf[4],
2055 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1da177e4
LT		 2056 return 0;
2057}
2058
1da177e4 2059/**
b142eb65 2060 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1da177e4
LT		 2061 * @args: device IDENTIFY data / SCSI command of interest.
2062 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2063 *
b142eb65
JG		 2064 * Yields two logical unit device identification designators:
2065 * - vendor specific ASCII containing the ATA serial number
2066 * - SAT defined "t10 vendor id based" containing ASCII vendor
2067 * name ("ATA "), model and serial numbers.
1da177e4
LT		 2068 *
2069 * LOCKING:
cca3974e 2070 * spin_lock_irqsave(host lock)
1da177e4 2071 */
87340e98 2072static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2073{
b142eb65 2074 const int sat_model_serial_desc_len = 68;
87340e98 2075 int num;
1da177e4 2076
b142eb65
JG		 2077 rbuf[1] = 0x83; /* this page code */
2078 num = 4;
2079
87340e98
TH		 2080 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2081 rbuf[num + 0] = 2;
2082 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2083 num += 4;
2084 ata_id_string(args->id, (unsigned char *) rbuf + num,
2085 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2086 num += ATA_ID_SERNO_LEN;
2087
2088 /* SAT defined lu model and serial numbers descriptor */
2089 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2090 rbuf[num + 0] = 2;
2091 rbuf[num + 1] = 1;
2092 rbuf[num + 3] = sat_model_serial_desc_len;
2093 num += 4;
2094 memcpy(rbuf + num, "ATA ", 8);
2095 num += 8;
2096 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2097 ATA_ID_PROD_LEN);
2098 num += ATA_ID_PROD_LEN;
2099 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2100 ATA_ID_SERNO_LEN);
2101 num += ATA_ID_SERNO_LEN;
2102
6b3b9d73
HR		 2103 if (ata_id_has_wwn(args->id)) {
2104 /* SAT defined lu world wide name */
2105 /* piv=0, assoc=lu, code_set=binary, designator=NAA */
2106 rbuf[num + 0] = 1;
2107 rbuf[num + 1] = 3;
2108 rbuf[num + 3] = ATA_ID_WWN_LEN;
2109 num += 4;
2110 ata_id_string(args->id, (unsigned char *) rbuf + num,
2111 ATA_ID_WWN, ATA_ID_WWN_LEN);
2112 num += ATA_ID_WWN_LEN;
2113 }
b142eb65 2114 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
1da177e4
LT		 2115 return 0;
2116}
2117
ad355b46
JG		 2118/**
2119 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2120 * @args: device IDENTIFY data / SCSI command of interest.
2121 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
ad355b46
JG		 2122 *
2123 * Yields SAT-specified ATA VPD page.
2124 *
2125 * LOCKING:
2126 * spin_lock_irqsave(host lock)
2127 */
87340e98 2128static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
ad355b46 2129{
ad355b46 2130 struct ata_taskfile tf;
ad355b46 2131
ad355b46
JG		 2132 memset(&tf, 0, sizeof(tf));
2133
87340e98
TH		 2134 rbuf[1] = 0x89; /* our page code */
2135 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2136 rbuf[3] = (0x238 & 0xff);
ad355b46 2137
87340e98
TH		 2138 memcpy(&rbuf[8], "linux ", 8);
2139 memcpy(&rbuf[16], "libata ", 16);
2140 memcpy(&rbuf[32], DRV_VERSION, 4);
ad355b46
JG		 2141
2142 /* we don't store the ATA device signature, so we fake it */
2143
2144 tf.command = ATA_DRDY; /* really, this is Status reg */
2145 tf.lbal = 0x1;
2146 tf.nsect = 0x1;
2147
87340e98
TH		 2148 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2149 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
ad355b46 2150
87340e98 2151 rbuf[56] = ATA_CMD_ID_ATA;
ad355b46 2152
87340e98 2153 memcpy(&rbuf[60], &args->id[0], 512);
ad355b46
JG		 2154 return 0;
2155}
2156
18f0f978
CH		 2157static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
2158{
295124dc 2159 u16 min_io_sectors;
18f0f978
CH		 2160
2161 rbuf[1] = 0xb0;
2162 rbuf[3] = 0x3c; /* required VPD size with unmap support */
2163
2164 /*
2165 * Optimal transfer length granularity.
2166 *
2167 * This is always one physical block, but for disks with a smaller
2168 * logical than physical sector size we need to figure out what the
2169 * latter is.
2170 */
295124dc 2171 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
18f0f978
CH		 2172 put_unaligned_be16(min_io_sectors, &rbuf[6]);
2173
2174 /*
2175 * Optimal unmap granularity.
2176 *
2177 * The ATA spec doesn't even know about a granularity or alignment
2178 * for the TRIM command. We can leave away most of the unmap related
2179 * VPD page entries, but we have specifify a granularity to signal
2180 * that we support some form of unmap - in thise case via WRITE SAME
2181 * with the unmap bit set.
2182 */
e78db4df 2183 if (ata_id_has_trim(args->id)) {
5f4e2066 2184 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
18f0f978 2185 put_unaligned_be32(1, &rbuf[28]);
e78db4df 2186 }
18f0f978
CH		 2187
2188 return 0;
2189}
2190
1e9dbc92
MW		 2191static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2192{
4bca3286
MP		 2193 int form_factor = ata_id_form_factor(args->id);
2194 int media_rotation_rate = ata_id_rotation_rate(args->id);
2195
1e9dbc92
MW		 2196 rbuf[1] = 0xb1;
2197 rbuf[3] = 0x3c;
4bca3286
MP		 2198 rbuf[4] = media_rotation_rate >> 8;
2199 rbuf[5] = media_rotation_rate;
2200 rbuf[7] = form_factor;
1e9dbc92
MW		 2201
2202 return 0;
2203}
2204
02e0a604
MP		 2205static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
2206{
2207 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2208 rbuf[1] = 0xb2;
2209 rbuf[3] = 0x4;
2210 rbuf[5] = 1 << 6; /* TPWS */
2211
2212 return 0;
2213}
2214
1da177e4 2215/**
0cba632b 2216 * ata_scsiop_noop - Command handler that simply returns success.
1da177e4
LT		 2217 * @args: device IDENTIFY data / SCSI command of interest.
2218 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2219 *
2220 * No operation. Simply returns success to caller, to indicate
2221 * that the caller should successfully complete this SCSI command.
2222 *
2223 * LOCKING:
cca3974e 2224 * spin_lock_irqsave(host lock)
1da177e4 2225 */
87340e98 2226static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2227{
2228 VPRINTK("ENTER\n");
2229 return 0;
2230}
2231
6ca8e794
PB		 2232/**
2233 * modecpy - Prepare response for MODE SENSE
2234 * @dest: output buffer
2235 * @src: data being copied
2236 * @n: length of mode page
2237 * @changeable: whether changeable parameters are requested
2238 *
2239 * Generate a generic MODE SENSE page for either current or changeable
2240 * parameters.
2241 *
2242 * LOCKING:
2243 * None.
2244 */
2245static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
2246{
2247 if (changeable) {
2248 memcpy(dest, src, 2);
2249 memset(dest + 2, 0, n - 2);
2250 } else {
2251 memcpy(dest, src, n);
2252 }
2253}
2254
1da177e4
LT		 2255/**
2256 * ata_msense_caching - Simulate MODE SENSE caching info page
2257 * @id: device IDENTIFY data
87340e98 2258 * @buf: output buffer
6ca8e794 2259 * @changeable: whether changeable parameters are requested
1da177e4
LT		 2260 *
2261 * Generate a caching info page, which conditionally indicates
2262 * write caching to the SCSI layer, depending on device
2263 * capabilities.
2264 *
2265 * LOCKING:
2266 * None.
2267 */
6ca8e794 2268static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
1da177e4 2269{
6ca8e794 2270 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
1b26d29c 2271 if (changeable || ata_id_wcache_enabled(id))
87340e98 2272 buf[2] |= (1 << 2); /* write cache enable */
6ca8e794 2273 if (!changeable && !ata_id_rahead_enabled(id))
87340e98
TH		 2274 buf[12] |= (1 << 5); /* disable read ahead */
2275 return sizeof(def_cache_mpage);
1da177e4
LT		 2276}
2277
2278/**
2279 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
87340e98 2280 * @buf: output buffer
6ca8e794 2281 * @changeable: whether changeable parameters are requested
1da177e4
LT		 2282 *
2283 * Generate a generic MODE SENSE control mode page.
2284 *
2285 * LOCKING:
2286 * None.
2287 */
6ca8e794 2288static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable)
1da177e4 2289{
6ca8e794 2290 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable);
00ac37f5 2291 return sizeof(def_control_mpage);
1da177e4
LT		 2292}
2293
2294/**
2295 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
ec2a20e6 2296 * @buf: output buffer
6ca8e794 2297 * @changeable: whether changeable parameters are requested
1da177e4
LT		 2298 *
2299 * Generate a generic MODE SENSE r/w error recovery page.
2300 *
2301 * LOCKING:
2302 * None.
2303 */
6ca8e794 2304static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable)
1da177e4 2305{
6ca8e794
PB		 2306 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage),
2307 changeable);
00ac37f5 2308 return sizeof(def_rw_recovery_mpage);
1da177e4
LT		 2309}
2310
48bdc8ec
JA		 2311/*
2312 * We can turn this into a real blacklist if it's needed, for now just
2313 * blacklist any Maxtor BANC1G10 revision firmware
2314 */
2315static int ata_dev_supports_fua(u16 *id)
2316{
a0cf733b 2317 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
48bdc8ec 2318
c3c013a2
JG		 2319 if (!libata_fua)
2320 return 0;
48bdc8ec
JA		 2321 if (!ata_id_has_fua(id))
2322 return 0;
2323
a0cf733b
TH		 2324 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2325 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
48bdc8ec 2326
2e02671d 2327 if (strcmp(model, "Maxtor"))
48bdc8ec 2328 return 1;
2e02671d 2329 if (strcmp(fw, "BANC1G10"))
48bdc8ec
JA		 2330 return 1;
2331
2332 return 0; /* blacklisted */
2333}
2334
1da177e4
LT		 2335/**
2336 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2337 * @args: device IDENTIFY data / SCSI command of interest.
2338 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2339 *
00ac37f5
DG		 2340 * Simulate MODE SENSE commands. Assume this is invoked for direct
2341 * access devices (e.g. disks) only. There should be no block
2342 * descriptor for other device types.
1da177e4
LT		 2343 *
2344 * LOCKING:
cca3974e 2345 * spin_lock_irqsave(host lock)
1da177e4 2346 */
87340e98 2347static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2348{
9a3dccc4 2349 struct ata_device *dev = args->dev;
87340e98 2350 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
00ac37f5
DG		 2351 const u8 sat_blk_desc[] = {
2352 0, 0, 0, 0, /* number of blocks: sat unspecified */
2353 0,
2354 0, 0x2, 0x0 /* block length: 512 bytes */
2355 };
2356 u8 pg, spg;
87340e98 2357 unsigned int ebd, page_control, six_byte;
9a3dccc4 2358 u8 dpofua;
1da177e4
LT		 2359
2360 VPRINTK("ENTER\n");
2361
2362 six_byte = (scsicmd[0] == MODE_SENSE);
00ac37f5
DG		 2363 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2364 /*
2365 * LLBA bit in msense(10) ignored (compliant)
1da177e4 2366 */
00ac37f5 2367
1da177e4 2368 page_control = scsicmd[2] >> 6;
ae006510
DG		 2369 switch (page_control) {
2370 case 0: /* current */
6ca8e794
PB		 2371 case 1: /* changeable */
2372 case 2: /* defaults */
ae006510
DG		 2373 break; /* supported */
2374 case 3: /* saved */
2375 goto saving_not_supp;
ae006510
DG		 2376 default:
2377 goto invalid_fld;
2378 }
1da177e4 2379
87340e98
TH		 2380 if (six_byte)
2381 p += 4 + (ebd ? 8 : 0);
2382 else
2383 p += 8 + (ebd ? 8 : 0);
1da177e4 2384
00ac37f5
DG		 2385 pg = scsicmd[2] & 0x3f;
2386 spg = scsicmd[3];
2387 /*
2388 * No mode subpages supported (yet) but asking for _all_
2389 * subpages may be valid
2390 */
2391 if (spg && (spg != ALL_SUB_MPAGES))
2392 goto invalid_fld;
2393
2394 switch(pg) {
2395 case RW_RECOVERY_MPAGE:
6ca8e794 2396 p += ata_msense_rw_recovery(p, page_control == 1);
1da177e4
LT		 2397 break;
2398
00ac37f5 2399 case CACHE_MPAGE:
6ca8e794 2400 p += ata_msense_caching(args->id, p, page_control == 1);
1da177e4
LT		 2401 break;
2402
87340e98 2403 case CONTROL_MPAGE:
6ca8e794 2404 p += ata_msense_ctl_mode(p, page_control == 1);
1da177e4 2405 break;
1da177e4 2406
00ac37f5 2407 case ALL_MPAGES:
6ca8e794
PB		 2408 p += ata_msense_rw_recovery(p, page_control == 1);
2409 p += ata_msense_caching(args->id, p, page_control == 1);
2410 p += ata_msense_ctl_mode(p, page_control == 1);
1da177e4
LT		 2411 break;
2412
2413 default: /* invalid page code */
ae006510 2414 goto invalid_fld;
1da177e4
LT		 2415 }
2416
9a3dccc4 2417 dpofua = 0;
f79d409f 2418 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
9a3dccc4
TH		 2419 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2420 dpofua = 1 << 4;
2421
1da177e4 2422 if (six_byte) {
87340e98
TH		 2423 rbuf[0] = p - rbuf - 1;
2424 rbuf[2] |= dpofua;
00ac37f5 2425 if (ebd) {
87340e98
TH		 2426 rbuf[3] = sizeof(sat_blk_desc);
2427 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
00ac37f5 2428 }
1da177e4 2429 } else {
87340e98
TH		 2430 unsigned int output_len = p - rbuf - 2;
2431
1da177e4 2432 rbuf[0] = output_len >> 8;
87340e98
TH		 2433 rbuf[1] = output_len;
2434 rbuf[3] |= dpofua;
00ac37f5 2435 if (ebd) {
87340e98
TH		 2436 rbuf[7] = sizeof(sat_blk_desc);
2437 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
00ac37f5 2438 }
1da177e4 2439 }
1da177e4 2440 return 0;
ae006510
DG		 2441
2442invalid_fld:
2443 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2444 /* "Invalid field in cbd" */
2445 return 1;
2446
2447saving_not_supp:
2448 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2449 /* "Saving parameters not supported" */
2450 return 1;
1da177e4
LT		 2451}
2452
2453/**
2454 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2455 * @args: device IDENTIFY data / SCSI command of interest.
2456 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2457 *
2458 * Simulate READ CAPACITY commands.
2459 *
2460 * LOCKING:
6a36261e 2461 * None.
1da177e4 2462 */
87340e98 2463static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2464{
61d79a8e
MP		 2465 struct ata_device *dev = args->dev;
2466 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
295124dc
GG		 2467 u32 sector_size; /* physical sector size in bytes */
2468 u8 log2_per_phys;
2469 u16 lowest_aligned;
2470
2471 sector_size = ata_id_logical_sector_size(dev->id);
2472 log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2473 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
1da177e4
LT		 2474
2475 VPRINTK("ENTER\n");
2476
1da177e4 2477 if (args->cmd->cmnd[0] == READ_CAPACITY) {
6a36261e
TH		 2478 if (last_lba >= 0xffffffffULL)
2479 last_lba = 0xffffffff;
0c144d0d 2480
1da177e4 2481 /* sector count, 32-bit */
87340e98
TH		 2482 rbuf[0] = last_lba >> (8 * 3);
2483 rbuf[1] = last_lba >> (8 * 2);
2484 rbuf[2] = last_lba >> (8 * 1);
2485 rbuf[3] = last_lba;
1da177e4
LT		 2486
2487 /* sector size */
295124dc
GG		 2488 rbuf[4] = sector_size >> (8 * 3);
2489 rbuf[5] = sector_size >> (8 * 2);
2490 rbuf[6] = sector_size >> (8 * 1);
2491 rbuf[7] = sector_size;
1da177e4
LT		 2492 } else {
2493 /* sector count, 64-bit */
87340e98
TH		 2494 rbuf[0] = last_lba >> (8 * 7);
2495 rbuf[1] = last_lba >> (8 * 6);
2496 rbuf[2] = last_lba >> (8 * 5);
2497 rbuf[3] = last_lba >> (8 * 4);
2498 rbuf[4] = last_lba >> (8 * 3);
2499 rbuf[5] = last_lba >> (8 * 2);
2500 rbuf[6] = last_lba >> (8 * 1);
2501 rbuf[7] = last_lba;
1da177e4
LT		 2502
2503 /* sector size */
295124dc
GG		 2504 rbuf[ 8] = sector_size >> (8 * 3);
2505 rbuf[ 9] = sector_size >> (8 * 2);
2506 rbuf[10] = sector_size >> (8 * 1);
2507 rbuf[11] = sector_size;
61d79a8e
MP		 2508
2509 rbuf[12] = 0;
295124dc 2510 rbuf[13] = log2_per_phys;
61d79a8e
MP		 2511 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2512 rbuf[15] = lowest_aligned;
18f0f978 2513
143482d1
AF		 2514 if (ata_id_has_trim(args->id) &&
2515 !(dev->horkage & ATA_HORKAGE_NOTRIM)) {
e78db4df
MP		 2516 rbuf[14] |= 0x80; /* TPE */
2517
2518 if (ata_id_has_zero_after_trim(args->id))
2519 rbuf[14] |= 0x40; /* TPRZ */
2520 }
1da177e4
LT		 2521 }
2522
2523 return 0;
2524}
2525
2526/**
2527 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2528 * @args: device IDENTIFY data / SCSI command of interest.
2529 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2530 *
2531 * Simulate REPORT LUNS command.
2532 *
2533 * LOCKING:
cca3974e 2534 * spin_lock_irqsave(host lock)
1da177e4 2535 */
87340e98 2536static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2537{
2538 VPRINTK("ENTER\n");
2539 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2540
2541 return 0;
2542}
2543
77853bf2 2544static void atapi_sense_complete(struct ata_queued_cmd *qc)
a939c963 2545{
74e6c8c3 2546 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
c6e6e666
JG		 2547 /* FIXME: not quite right; we don't want the
2548 * translation of taskfile registers into
2549 * a sense descriptors, since that's only
2550 * correct for ATA, not ATAPI
2551 */
750426aa 2552 ata_gen_passthru_sense(qc);
74e6c8c3 2553 }
a939c963 2554
c6e6e666 2555 qc->scsidone(qc->scsicmd);
77853bf2 2556 ata_qc_free(qc);
c6e6e666 2557}
a939c963 2558
c6e6e666
JG		 2559/* is it pointless to prefer PIO for "safety reasons"? */
2560static inline int ata_pio_use_silly(struct ata_port *ap)
2561{
2562 return (ap->flags & ATA_FLAG_PIO_DMA);
2563}
2564
2565static void atapi_request_sense(struct ata_queued_cmd *qc)
2566{
2567 struct ata_port *ap = qc->ap;
2568 struct scsi_cmnd *cmd = qc->scsicmd;
2569
2570 DPRINTK("ATAPI request sense\n");
a939c963
JG		 2571
2572 /* FIXME: is this needed? */
7ccd720d 2573 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
a939c963 2574
127102ae 2575#ifdef CONFIG_ATA_SFF
855d854a
JB		 2576 if (ap->ops->sff_tf_read)
2577 ap->ops->sff_tf_read(ap, &qc->tf);
127102ae 2578#endif
c6e6e666
JG		 2579
2580 /* fill these in, for the case where they are -not- overwritten */
2581 cmd->sense_buffer[0] = 0x70;
2582 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2583
2584 ata_qc_reinit(qc);
2585
93f8fecb 2586 /* setup sg table and init transfer direction */
cadb7345 2587 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
93f8fecb 2588 ata_sg_init(qc, &qc->sgent, 1);
a939c963
JG		 2589 qc->dma_dir = DMA_FROM_DEVICE;
2590
6e7846e9 2591 memset(&qc->cdb, 0, qc->dev->cdb_len);
a939c963
JG		 2592 qc->cdb[0] = REQUEST_SENSE;
2593 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2594
2595 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2596 qc->tf.command = ATA_CMD_PACKET;
2597
c6e6e666 2598 if (ata_pio_use_silly(ap)) {
0dc36888 2599 qc->tf.protocol = ATAPI_PROT_DMA;
c6e6e666
JG		 2600 qc->tf.feature |= ATAPI_PKT_DMA;
2601 } else {
0dc36888 2602 qc->tf.protocol = ATAPI_PROT_PIO;
2db78dd3
AC		 2603 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2604 qc->tf.lbah = 0;
c6e6e666 2605 }
a939c963
JG		 2606 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2607
c6e6e666 2608 qc->complete_fn = atapi_sense_complete;
a939c963 2609
8e0e694a 2610 ata_qc_issue(qc);
a939c963
JG		 2611
2612 DPRINTK("EXIT\n");
2613}
2614
77853bf2 2615static void atapi_qc_complete(struct ata_queued_cmd *qc)
1da177e4
LT		 2616{
2617 struct scsi_cmnd *cmd = qc->scsicmd;
a22e2eb0 2618 unsigned int err_mask = qc->err_mask;
1da177e4 2619
a7dac447 2620 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
e12669e7 2621
246619da
TH		 2622 /* handle completion from new EH */
2623 if (unlikely(qc->ap->ops->error_handler &&
2624 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2625
2626 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2627 /* FIXME: not quite right; we don't want the
2628 * translation of taskfile registers into a
2629 * sense descriptors, since that's only
2630 * correct for ATA, not ATAPI
2631 */
750426aa 2632 ata_gen_passthru_sense(qc);
246619da
TH		 2633 }
2634
22aac089
TH		 2635 /* SCSI EH automatically locks door if sdev->locked is
2636 * set. Sometimes door lock request continues to
2637 * fail, for example, when no media is present. This
2638 * creates a loop - SCSI EH issues door lock which
2639 * fails and gets invoked again to acquire sense data
2640 * for the failed command.
2641 *
2642 * If door lock fails, always clear sdev->locked to
2643 * avoid this infinite loop.
2a5f07b5
TH		 2644 *
2645 * This may happen before SCSI scan is complete. Make
2646 * sure qc->dev->sdev isn't NULL before dereferencing.
22aac089 2647 */
2a5f07b5 2648 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
22aac089
TH		 2649 qc->dev->sdev->locked = 0;
2650
246619da
TH		 2651 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2652 qc->scsidone(cmd);
2653 ata_qc_free(qc);
2654 return;
2655 }
2656
2657 /* successful completion or old EH failure path */
a7dac447 2658 if (unlikely(err_mask & AC_ERR_DEV)) {
1da177e4 2659 cmd->result = SAM_STAT_CHECK_CONDITION;
c6e6e666 2660 atapi_request_sense(qc);
77853bf2 2661 return;
74e6c8c3 2662 } else if (unlikely(err_mask)) {
a7dac447
JG		 2663 /* FIXME: not quite right; we don't want the
2664 * translation of taskfile registers into
2665 * a sense descriptors, since that's only
2666 * correct for ATA, not ATAPI
2667 */
750426aa 2668 ata_gen_passthru_sense(qc);
74e6c8c3 2669 } else {
1da177e4
LT		 2670 u8 *scsicmd = cmd->cmnd;
2671
fd71da46 2672 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
b445c568 2673 unsigned long flags;
87340e98 2674 u8 *buf;
b445c568 2675
87340e98 2676 buf = ata_scsi_rbuf_get(cmd, true, &flags);
a15dbeb4
JG		 2677
2678 /* ATAPI devices typically report zero for their SCSI version,
2679 * and sometimes deviate from the spec WRT response data
2680 * format. If SCSI version is reported as zero like normal,
2681 * then we make the following fixups: 1) Fake MMC-5 version,
2682 * to indicate to the Linux scsi midlayer this is a modern
2683 * device. 2) Ensure response data format / ATAPI information
2684 * are always correct.
a15dbeb4
JG		 2685 */
2686 if (buf[2] == 0) {
2687 buf[2] = 0x5;
2688 buf[3] = 0x32;
2689 }
2690
87340e98 2691 ata_scsi_rbuf_put(cmd, true, &flags);
1da177e4 2692 }
a15dbeb4 2693
1da177e4
LT		 2694 cmd->result = SAM_STAT_GOOD;
2695 }
2696
2697 qc->scsidone(cmd);
77853bf2 2698 ata_qc_free(qc);
1da177e4
LT		 2699}
2700/**
2701 * atapi_xlat - Initialize PACKET taskfile
2702 * @qc: command structure to be initialized
1da177e4
LT		 2703 *
2704 * LOCKING:
cca3974e 2705 * spin_lock_irqsave(host lock)
1da177e4
LT		 2706 *
2707 * RETURNS:
2708 * Zero on success, non-zero on failure.
2709 */
ad706991 2710static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
1da177e4 2711{
542b1444 2712 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4 2713 struct ata_device *dev = qc->dev;
542b1444 2714 int nodata = (scmd->sc_data_direction == DMA_NONE);
5895ef9a 2715 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2db78dd3 2716 unsigned int nbytes;
1da177e4 2717
2e5704f6
TH		 2718 memset(qc->cdb, 0, dev->cdb_len);
2719 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
1da177e4
LT		 2720
2721 qc->complete_fn = atapi_qc_complete;
2722
2723 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
542b1444 2724 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1da177e4
LT		 2725 qc->tf.flags |= ATA_TFLAG_WRITE;
2726 DPRINTK("direction: write\n");
2727 }
2728
2729 qc->tf.command = ATA_CMD_PACKET;
aacda375 2730 ata_qc_set_pc_nbytes(qc);
e00f1ff3
TH		 2731
2732 /* check whether ATAPI DMA is safe */
5895ef9a 2733 if (!nodata && !using_pio && atapi_check_dma(qc))
e00f1ff3 2734 using_pio = 1;
1da177e4 2735
e190222d
TH		 2736 /* Some controller variants snoop this value for Packet
2737 * transfers to do state machine and FIFO management. Thus we
2738 * want to set it properly, and for DMA where it is
2739 * effectively meaningless.
2740 */
aacda375 2741 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2db78dd3 2742
e190222d
TH		 2743 /* Most ATAPI devices which honor transfer chunk size don't
2744 * behave according to the spec when odd chunk size which
2745 * matches the transfer length is specified. If the number of
2746 * bytes to transfer is 2n+1. According to the spec, what
2747 * should happen is to indicate that 2n+1 is going to be
2748 * transferred and transfer 2n+2 bytes where the last byte is
2749 * padding.
2750 *
2751 * In practice, this doesn't happen. ATAPI devices first
2752 * indicate and transfer 2n bytes and then indicate and
2753 * transfer 2 bytes where the last byte is padding.
2754 *
2755 * This inconsistency confuses several controllers which
2756 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2757 * These controllers use actual number of transferred bytes to
2758 * update DMA poitner and transfer of 4n+2 bytes make those
2759 * controller push DMA pointer by 4n+4 bytes because SATA data
2760 * FISes are aligned to 4 bytes. This causes data corruption
2761 * and buffer overrun.
2762 *
2763 * Always setting nbytes to even number solves this problem
2764 * because then ATAPI devices don't have to split data at 2n
2765 * boundaries.
2766 */
2767 if (nbytes & 0x1)
2768 nbytes++;
2769
2db78dd3
AC		 2770 qc->tf.lbam = (nbytes & 0xFF);
2771 qc->tf.lbah = (nbytes >> 8);
2772
5895ef9a
TH		 2773 if (nodata)
2774 qc->tf.protocol = ATAPI_PROT_NODATA;
2775 else if (using_pio)
2776 qc->tf.protocol = ATAPI_PROT_PIO;
2777 else {
e00f1ff3 2778 /* DMA data xfer */
0dc36888 2779 qc->tf.protocol = ATAPI_PROT_DMA;
1da177e4
LT		 2780 qc->tf.feature |= ATAPI_PKT_DMA;
2781
91163006
TH		 2782 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2783 (scmd->sc_data_direction != DMA_TO_DEVICE))
95de719a 2784 /* some SATA bridges need us to indicate data xfer direction */
1da177e4 2785 qc->tf.feature |= ATAPI_DMADIR;
1da177e4
LT		 2786 }
2787
2db78dd3
AC		 2788
2789 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2790 as ATAPI tape drives don't get this right otherwise */
1da177e4
LT		 2791 return 0;
2792}
2793
2dcb407e 2794static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
ab5b3a5b 2795{
071f44b1 2796 if (!sata_pmp_attached(ap)) {
7e20e7b9
DC		 2797 if (likely(devno >= 0 &&
2798 devno < ata_link_max_devices(&ap->link)))
41bda9c9
TH		 2799 return &ap->link.device[devno];
2800 } else {
7e20e7b9
DC		 2801 if (likely(devno >= 0 &&
2802 devno < ap->nr_pmp_links))
41bda9c9
TH		 2803 return &ap->pmp_link[devno].device[0];
2804 }
2805
ab5b3a5b
TH		 2806 return NULL;
2807}
2808
2dcb407e
JG		 2809static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2810 const struct scsi_device *scsidev)
ab5b3a5b 2811{
41bda9c9
TH		 2812 int devno;
2813
ab5b3a5b 2814 /* skip commands not addressed to targets we simulate */
071f44b1 2815 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 2816 if (unlikely(scsidev->channel || scsidev->lun))
2817 return NULL;
2818 devno = scsidev->id;
2819 } else {
2820 if (unlikely(scsidev->id || scsidev->lun))
2821 return NULL;
2822 devno = scsidev->channel;
2823 }
ab5b3a5b 2824
41bda9c9 2825 return ata_find_dev(ap, devno);
ab5b3a5b
TH		 2826}
2827
1da177e4
LT		 2828/**
2829 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2830 * @ap: ATA port to which the device is attached
2831 * @scsidev: SCSI device from which we derive the ATA device
2832 *
2833 * Given various information provided in struct scsi_cmnd,
2834 * map that onto an ATA bus, and using that mapping
2835 * determine which ata_device is associated with the
2836 * SCSI command to be sent.
2837 *
2838 * LOCKING:
cca3974e 2839 * spin_lock_irqsave(host lock)
1da177e4
LT		 2840 *
2841 * RETURNS:
2842 * Associated ATA device, or %NULL if not found.
2843 */
1da177e4 2844static struct ata_device *
057ace5e 2845ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
1da177e4 2846{
ab5b3a5b 2847 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
1da177e4 2848
2486fa56 2849 if (unlikely(!dev || !ata_dev_enabled(dev)))
1da177e4
LT		 2850 return NULL;
2851
1da177e4
LT		 2852 return dev;
2853}
2854
b095518e
JG		 2855/*
2856 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2857 * @byte1: Byte 1 from pass-thru CDB.
2858 *
2859 * RETURNS:
2860 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2861 */
2862static u8
2863ata_scsi_map_proto(u8 byte1)
2864{
2865 switch((byte1 & 0x1e) >> 1) {
2dcb407e
JG		 2866 case 3: /* Non-data */
2867 return ATA_PROT_NODATA;
2868
2869 case 6: /* DMA */
2870 case 10: /* UDMA Data-in */
2871 case 11: /* UDMA Data-Out */
2872 return ATA_PROT_DMA;
2873
2874 case 4: /* PIO Data-in */
2875 case 5: /* PIO Data-out */
2876 return ATA_PROT_PIO;
2877
2878 case 0: /* Hard Reset */
2879 case 1: /* SRST */
2880 case 8: /* Device Diagnostic */
2881 case 9: /* Device Reset */
2882 case 7: /* DMA Queued */
2883 case 12: /* FPDMA */
2884 case 15: /* Return Response Info */
2885 default: /* Reserved */
2886 break;
b095518e
JG		 2887 }
2888
2889 return ATA_PROT_UNKNOWN;
2890}
2891
2892/**
2893 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2894 * @qc: command structure to be initialized
b095518e
JG		 2895 *
2896 * Handles either 12 or 16-byte versions of the CDB.
2897 *
2898 * RETURNS:
2899 * Zero on success, non-zero on failure.
2900 */
ad706991 2901static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
b095518e
JG		 2902{
2903 struct ata_taskfile *tf = &(qc->tf);
542b1444 2904 struct scsi_cmnd *scmd = qc->scsicmd;
f79d409f 2905 struct ata_device *dev = qc->dev;
ad706991 2906 const u8 *cdb = scmd->cmnd;
b095518e 2907
542b1444 2908 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
9a405257 2909 goto invalid_fld;
8190bdb9 2910
b095518e
JG		 2911 /*
2912 * 12 and 16 byte CDBs use different offsets to
2913 * provide the various register values.
2914 */
542b1444 2915 if (cdb[0] == ATA_16) {
b095518e
JG		 2916 /*
2917 * 16-byte CDB - may contain extended commands.
2918 *
2919 * If that is the case, copy the upper byte register values.
2920 */
542b1444
TH		 2921 if (cdb[1] & 0x01) {
2922 tf->hob_feature = cdb[3];
2923 tf->hob_nsect = cdb[5];
2924 tf->hob_lbal = cdb[7];
2925 tf->hob_lbam = cdb[9];
2926 tf->hob_lbah = cdb[11];
b095518e
JG		 2927 tf->flags |= ATA_TFLAG_LBA48;
2928 } else
2929 tf->flags &= ~ATA_TFLAG_LBA48;
2930
2931 /*
2932 * Always copy low byte, device and command registers.
2933 */
542b1444
TH		 2934 tf->feature = cdb[4];
2935 tf->nsect = cdb[6];
2936 tf->lbal = cdb[8];
2937 tf->lbam = cdb[10];
2938 tf->lbah = cdb[12];
2939 tf->device = cdb[13];
2940 tf->command = cdb[14];
b095518e
JG		 2941 } else {
2942 /*
2943 * 12-byte CDB - incapable of extended commands.
2944 */
2945 tf->flags &= ~ATA_TFLAG_LBA48;
2946
542b1444
TH		 2947 tf->feature = cdb[3];
2948 tf->nsect = cdb[4];
2949 tf->lbal = cdb[5];
2950 tf->lbam = cdb[6];
2951 tf->lbah = cdb[7];
2952 tf->device = cdb[8];
2953 tf->command = cdb[9];
b095518e 2954 }
fa4453c4
AL		 2955
2956 /* enforce correct master/slave bit */
2957 tf->device = dev->devno ?
2958 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
b095518e 2959
bd30add8 2960 switch (tf->command) {
295124dc 2961 /* READ/WRITE LONG use a non-standard sect_size */
bd30add8
TH		 2962 case ATA_CMD_READ_LONG:
2963 case ATA_CMD_READ_LONG_ONCE:
2964 case ATA_CMD_WRITE_LONG:
2965 case ATA_CMD_WRITE_LONG_ONCE:
2966 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2967 goto invalid_fld;
2968 qc->sect_size = scsi_bufflen(scmd);
295124dc
GG		 2969 break;
2970
2971 /* commands using reported Logical Block size (e.g. 512 or 4K) */
2972 case ATA_CMD_CFA_WRITE_NE:
2973 case ATA_CMD_CFA_TRANS_SECT:
2974 case ATA_CMD_CFA_WRITE_MULT_NE:
2975 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
2976 case ATA_CMD_READ:
2977 case ATA_CMD_READ_EXT:
2978 case ATA_CMD_READ_QUEUED:
2979 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
2980 case ATA_CMD_FPDMA_READ:
2981 case ATA_CMD_READ_MULTI:
2982 case ATA_CMD_READ_MULTI_EXT:
2983 case ATA_CMD_PIO_READ:
2984 case ATA_CMD_PIO_READ_EXT:
2985 case ATA_CMD_READ_STREAM_DMA_EXT:
2986 case ATA_CMD_READ_STREAM_EXT:
2987 case ATA_CMD_VERIFY:
2988 case ATA_CMD_VERIFY_EXT:
2989 case ATA_CMD_WRITE:
2990 case ATA_CMD_WRITE_EXT:
2991 case ATA_CMD_WRITE_FUA_EXT:
2992 case ATA_CMD_WRITE_QUEUED:
2993 case ATA_CMD_WRITE_QUEUED_FUA_EXT:
2994 case ATA_CMD_FPDMA_WRITE:
2995 case ATA_CMD_WRITE_MULTI:
2996 case ATA_CMD_WRITE_MULTI_EXT:
2997 case ATA_CMD_WRITE_MULTI_FUA_EXT:
2998 case ATA_CMD_PIO_WRITE:
2999 case ATA_CMD_PIO_WRITE_EXT:
3000 case ATA_CMD_WRITE_STREAM_DMA_EXT:
3001 case ATA_CMD_WRITE_STREAM_EXT:
3002 qc->sect_size = scmd->device->sector_size;
3003 break;
3004
3005 /* Everything else uses 512 byte "sectors" */
3006 default:
3007 qc->sect_size = ATA_SECT_SIZE;
bd30add8
TH		 3008 }
3009
3010 /*
3011 * Set flags so that all registers will be written, pass on
3012 * write indication (used for PIO/DMA setup), result TF is
3013 * copied back and we don't whine too much about its failure.
3014 */
bc496ed0 3015 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
bd30add8
TH		 3016 if (scmd->sc_data_direction == DMA_TO_DEVICE)
3017 tf->flags |= ATA_TFLAG_WRITE;
3018
3019 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
3020
3021 /*
3022 * Set transfer length.
3023 *
3024 * TODO: find out if we need to do more here to
3025 * cover scatter/gather case.
3026 */
3027 ata_qc_set_pc_nbytes(qc);
3028
3029 /* We may not issue DMA commands if no DMA mode is set */
3030 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
3031 goto invalid_fld;
3032
1dce589c
AL		 3033 /* sanity check for pio multi commands */
3034 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
3035 goto invalid_fld;
3036
3037 if (is_multi_taskfile(tf)) {
3038 unsigned int multi_count = 1 << (cdb[1] >> 5);
3039
3040 /* compare the passed through multi_count
3041 * with the cached multi_count of libata
3042 */
3043 if (multi_count != dev->multi_count)
a9a79dfe
JP		 3044 ata_dev_warn(dev, "invalid multi_count %u ignored\n",
3045 multi_count);
d26fc955 3046 }
1dce589c 3047
b095518e
JG		 3048 /*
3049 * Filter SET_FEATURES - XFER MODE command -- otherwise,
3050 * SET_FEATURES - XFER MODE must be preceded/succeeded
3051 * by an update to hardware-specific registers for each
3052 * controller (i.e. the reason for ->set_piomode(),
3053 * ->set_dmamode(), and ->post_set_mode() hooks).
3054 */
bd30add8
TH		 3055 if (tf->command == ATA_CMD_SET_FEATURES &&
3056 tf->feature == SETFEATURES_XFER)
9a405257 3057 goto invalid_fld;
b095518e
JG		 3058
3059 /*
bd30add8
TH		 3060 * Filter TPM commands by default. These provide an
3061 * essentially uncontrolled encrypted "back door" between
3062 * applications and the disk. Set libata.allow_tpm=1 if you
3063 * have a real reason for wanting to use them. This ensures
3064 * that installed software cannot easily mess stuff up without
3065 * user intent. DVR type users will probably ship with this enabled
3066 * for movie content management.
b095518e 3067 *
bd30add8
TH		 3068 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3069 * for this and should do in future but that it is not sufficient as
3070 * DCS is an optional feature set. Thus we also do the software filter
3071 * so that we comply with the TC consortium stated goal that the user
3072 * can turn off TC features of their system.
b095518e 3073 */
bd30add8
TH		 3074 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
3075 goto invalid_fld;
e61e0672 3076
b095518e 3077 return 0;
9a405257
TH		 3078
3079 invalid_fld:
542b1444 3080 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
9a405257
TH		 3081 /* "Invalid field in cdb" */
3082 return 1;
b095518e
JG		 3083}
3084
18f0f978
CH		 3085static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3086{
3087 struct ata_taskfile *tf = &qc->tf;
3088 struct scsi_cmnd *scmd = qc->scsicmd;
3089 struct ata_device *dev = qc->dev;
3090 const u8 *cdb = scmd->cmnd;
3091 u64 block;
3092 u32 n_block;
3093 u32 size;
3094 void *buf;
3095
3096 /* we may not issue DMA commands if no DMA mode is set */
3097 if (unlikely(!dev->dma_mode))
3098 goto invalid_fld;
3099
3100 if (unlikely(scmd->cmd_len < 16))
3101 goto invalid_fld;
3102 scsi_16_lba_len(cdb, &block, &n_block);
3103
3104 /* for now we only support WRITE SAME with the unmap bit set */
3105 if (unlikely(!(cdb[1] & 0x8)))
3106 goto invalid_fld;
3107
3108 /*
3109 * WRITE SAME always has a sector sized buffer as payload, this
3110 * should never be a multiple entry S/G list.
3111 */
3112 if (!scsi_sg_count(scmd))
3113 goto invalid_fld;
3114
3115 buf = page_address(sg_page(scsi_sglist(scmd)));
d0634c4a 3116 size = ata_set_lba_range_entries(buf, 512, block, n_block);
18f0f978
CH		 3117
3118 tf->protocol = ATA_PROT_DMA;
3119 tf->hob_feature = 0;
3120 tf->feature = ATA_DSM_TRIM;
3121 tf->hob_nsect = (size / 512) >> 8;
3122 tf->nsect = size / 512;
3123 tf->command = ATA_CMD_DSM;
3124 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3125 ATA_TFLAG_WRITE;
3126
3127 ata_qc_set_pc_nbytes(qc);
3128
3129 return 0;
3130
3131 invalid_fld:
3132 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3133 /* "Invalid field in cdb" */
3134 return 1;
3135}
3136
1b26d29c
PB		 3137/**
3138 * ata_mselect_caching - Simulate MODE SELECT for caching info page
3139 * @qc: Storage for translated ATA taskfile
3140 * @buf: input buffer
3141 * @len: number of valid bytes in the input buffer
3142 *
3143 * Prepare a taskfile to modify caching information for the device.
3144 *
3145 * LOCKING:
3146 * None.
3147 */
3148static int ata_mselect_caching(struct ata_queued_cmd *qc,
3149 const u8 *buf, int len)
3150{
3151 struct ata_taskfile *tf = &qc->tf;
3152 struct ata_device *dev = qc->dev;
3153 char mpage[CACHE_MPAGE_LEN];
3154 u8 wce;
3155
3156 /*
3157 * The first two bytes of def_cache_mpage are a header, so offsets
3158 * in mpage are off by 2 compared to buf. Same for len.
3159 */
3160
3161 if (len != CACHE_MPAGE_LEN - 2)
3162 return -EINVAL;
3163
3164 wce = buf[0] & (1 << 2);
3165
3166 /*
3167 * Check that read-only bits are not modified.
3168 */
3169 ata_msense_caching(dev->id, mpage, false);
3170 mpage[2] &= ~(1 << 2);
3171 mpage[2] |= wce;
3172 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0)
3173 return -EINVAL;
3174
3175 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3176 tf->protocol = ATA_PROT_NODATA;
3177 tf->nsect = 0;
3178 tf->command = ATA_CMD_SET_FEATURES;
3179 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF;
3180 return 0;
3181}
3182
3183/**
3184 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands
3185 * @qc: Storage for translated ATA taskfile
3186 *
3187 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
3188 * Assume this is invoked for direct access devices (e.g. disks) only.
3189 * There should be no block descriptor for other device types.
3190 *
3191 * LOCKING:
3192 * spin_lock_irqsave(host lock)
3193 */
3194static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
3195{
3196 struct scsi_cmnd *scmd = qc->scsicmd;
3197 const u8 *cdb = scmd->cmnd;
3198 const u8 *p;
3199 u8 pg, spg;
3200 unsigned six_byte, pg_len, hdr_len, bd_len;
3201 int len;
3202
3203 VPRINTK("ENTER\n");
3204
3205 six_byte = (cdb[0] == MODE_SELECT);
3206 if (six_byte) {
3207 if (scmd->cmd_len < 5)
3208 goto invalid_fld;
3209
3210 len = cdb[4];
3211 hdr_len = 4;
3212 } else {
3213 if (scmd->cmd_len < 9)
3214 goto invalid_fld;
3215
3216 len = (cdb[7] << 8) + cdb[8];
3217 hdr_len = 8;
3218 }
3219
3220 /* We only support PF=1, SP=0. */
3221 if ((cdb[1] & 0x11) != 0x10)
3222 goto invalid_fld;
3223
3224 /* Test early for possible overrun. */
3225 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len)
3226 goto invalid_param_len;
3227
3228 p = page_address(sg_page(scsi_sglist(scmd)));
3229
3230 /* Move past header and block descriptors. */
3231 if (len < hdr_len)
3232 goto invalid_param_len;
3233
3234 if (six_byte)
3235 bd_len = p[3];
3236 else
3237 bd_len = (p[6] << 8) + p[7];
3238
3239 len -= hdr_len;
3240 p += hdr_len;
3241 if (len < bd_len)
3242 goto invalid_param_len;
3243 if (bd_len != 0 && bd_len != 8)
3244 goto invalid_param;
3245
3246 len -= bd_len;
3247 p += bd_len;
3248 if (len == 0)
3249 goto skip;
3250
3251 /* Parse both possible formats for the mode page headers. */
3252 pg = p[0] & 0x3f;
3253 if (p[0] & 0x40) {
3254 if (len < 4)
3255 goto invalid_param_len;
3256
3257 spg = p[1];
3258 pg_len = (p[2] << 8) | p[3];
3259 p += 4;
3260 len -= 4;
3261 } else {
3262 if (len < 2)
3263 goto invalid_param_len;
3264
3265 spg = 0;
3266 pg_len = p[1];
3267 p += 2;
3268 len -= 2;
3269 }
3270
3271 /*
3272 * No mode subpages supported (yet) but asking for _all_
3273 * subpages may be valid
3274 */
3275 if (spg && (spg != ALL_SUB_MPAGES))
3276 goto invalid_param;
3277 if (pg_len > len)
3278 goto invalid_param_len;
3279
3280 switch (pg) {
3281 case CACHE_MPAGE:
3282 if (ata_mselect_caching(qc, p, pg_len) < 0)
3283 goto invalid_param;
3284 break;
3285
3286 default: /* invalid page code */
3287 goto invalid_param;
3288 }
3289
3290 /*
3291 * Only one page has changeable data, so we only support setting one
3292 * page at a time.
3293 */
3294 if (len > pg_len)
3295 goto invalid_param;
3296
3297 return 0;
3298
3299 invalid_fld:
3300 /* "Invalid field in CDB" */
3301 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
3302 return 1;
3303
3304 invalid_param:
3305 /* "Invalid field in parameter list" */
3306 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0);
3307 return 1;
3308
3309 invalid_param_len:
3310 /* "Parameter list length error" */
3311 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3312 return 1;
3313
3314 skip:
3315 scmd->result = SAM_STAT_GOOD;
3316 return 1;
3317}
3318
1da177e4
LT		 3319/**
3320 * ata_get_xlat_func - check if SCSI to ATA translation is possible
3321 * @dev: ATA device
3322 * @cmd: SCSI command opcode to consider
3323 *
3324 * Look up the SCSI command given, and determine whether the
3325 * SCSI command is to be translated or simulated.
3326 *
3327 * RETURNS:
3328 * Pointer to translation function if possible, %NULL if not.
3329 */
3330
3331static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
3332{
3333 switch (cmd) {
3334 case READ_6:
3335 case READ_10:
3336 case READ_16:
3337
3338 case WRITE_6:
3339 case WRITE_10:
3340 case WRITE_16:
3341 return ata_scsi_rw_xlat;
3342
0cdd6eb7 3343 case WRITE_SAME_16:
18f0f978
CH		 3344 return ata_scsi_write_same_xlat;
3345
1da177e4
LT		 3346 case SYNCHRONIZE_CACHE:
3347 if (ata_try_flush_cache(dev))
3348 return ata_scsi_flush_xlat;
3349 break;
3350
3351 case VERIFY:
3352 case VERIFY_16:
3353 return ata_scsi_verify_xlat;
b095518e
JG		 3354
3355 case ATA_12:
3356 case ATA_16:
3357 return ata_scsi_pass_thru;
da61396d 3358
1b26d29c
PB		 3359 case MODE_SELECT:
3360 case MODE_SELECT_10:
3361 return ata_scsi_mode_select_xlat;
3362 break;
3363
972dcafb
DG		 3364 case START_STOP:
3365 return ata_scsi_start_stop_xlat;
1da177e4
LT		 3366 }
3367
3368 return NULL;
3369}
3370
3371/**
3372 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3373 * @ap: ATA port to which the command was being sent
3374 * @cmd: SCSI command to dump
3375 *
3376 * Prints the contents of a SCSI command via printk().
3377 */
3378
3379static inline void ata_scsi_dump_cdb(struct ata_port *ap,
3380 struct scsi_cmnd *cmd)
3381{
3382#ifdef ATA_DEBUG
3383 struct scsi_device *scsidev = cmd->device;
3384 u8 *scsicmd = cmd->cmnd;
3385
3386 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
44877b4e 3387 ap->print_id,
1da177e4
LT		 3388 scsidev->channel, scsidev->id, scsidev->lun,
3389 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
3390 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
3391 scsicmd[8]);
3392#endif
3393}
3394
542b1444 3395static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2115ea94 3396 struct ata_device *dev)
eb3f0f9c 3397{
baf4fdfa
ML		 3398 u8 scsi_op = scmd->cmnd[0];
3399 ata_xlat_func_t xlat_func;
2115ea94
TH		 3400 int rc = 0;
3401
eb3f0f9c 3402 if (dev->class == ATA_DEV_ATA) {
baf4fdfa
ML		 3403 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
3404 goto bad_cdb_len;
eb3f0f9c 3405
baf4fdfa
ML		 3406 xlat_func = ata_get_xlat_func(dev, scsi_op);
3407 } else {
3408 if (unlikely(!scmd->cmd_len))
3409 goto bad_cdb_len;
3410
3411 xlat_func = NULL;
3412 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
3413 /* relay SCSI command to ATAPI device */
607126c2
ML		 3414 int len = COMMAND_SIZE(scsi_op);
3415 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
baf4fdfa
ML		 3416 goto bad_cdb_len;
3417
3418 xlat_func = atapi_xlat;
3419 } else {
3420 /* ATA_16 passthru, treat as an ATA command */
3421 if (unlikely(scmd->cmd_len > 16))
3422 goto bad_cdb_len;
3423
3424 xlat_func = ata_get_xlat_func(dev, scsi_op);
3425 }
3426 }
3427
3428 if (xlat_func)
b27dcfb0 3429 rc = ata_scsi_translate(dev, scmd, xlat_func);
baf4fdfa 3430 else
b27dcfb0 3431 ata_scsi_simulate(dev, scmd);
2115ea94
TH		 3432
3433 return rc;
baf4fdfa
ML		 3434
3435 bad_cdb_len:
3436 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3437 scmd->cmd_len, scsi_op, dev->cdb_len);
3438 scmd->result = DID_ERROR << 16;
b27dcfb0 3439 scmd->scsi_done(scmd);
baf4fdfa 3440 return 0;
eb3f0f9c
BK		 3441}
3442
1da177e4
LT		 3443/**
3444 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
23e701e6 3445 * @shost: SCSI host of command to be sent
1da177e4 3446 * @cmd: SCSI command to be sent
1da177e4
LT		 3447 *
3448 * In some cases, this function translates SCSI commands into
3449 * ATA taskfiles, and queues the taskfiles to be sent to
3450 * hardware. In other cases, this function simulates a
3451 * SCSI device by evaluating and responding to certain
3452 * SCSI commands. This creates the overall effect of
3453 * ATA and ATAPI devices appearing as SCSI devices.
3454 *
3455 * LOCKING:
23e701e6 3456 * ATA host lock
1da177e4
LT		 3457 *
3458 * RETURNS:
2115ea94
TH		 3459 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3460 * 0 otherwise.
1da177e4 3461 */
23e701e6 3462int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
1da177e4
LT		 3463{
3464 struct ata_port *ap;
3465 struct ata_device *dev;
3466 struct scsi_device *scsidev = cmd->device;
2115ea94 3467 int rc = 0;
23e701e6 3468 unsigned long irq_flags;
1da177e4 3469
35bb94b1 3470 ap = ata_shost_to_port(shost);
005a5a06 3471
23e701e6 3472 spin_lock_irqsave(ap->lock, irq_flags);
1da177e4
LT		 3473
3474 ata_scsi_dump_cdb(ap, cmd);
3475
3476 dev = ata_scsi_find_dev(ap, scsidev);
eb3f0f9c 3477 if (likely(dev))
b27dcfb0 3478 rc = __ata_scsi_queuecmd(cmd, dev);
eb3f0f9c 3479 else {
1da177e4 3480 cmd->result = (DID_BAD_TARGET << 16);
23e701e6 3481 cmd->scsi_done(cmd);
1da177e4
LT		 3482 }
3483
23e701e6
JG		 3484 spin_unlock_irqrestore(ap->lock, irq_flags);
3485
2115ea94 3486 return rc;
1da177e4
LT		 3487}
3488
3489/**
3490 * ata_scsi_simulate - simulate SCSI command on ATA device
c893a3ae 3491 * @dev: the target device
1da177e4 3492 * @cmd: SCSI command being sent to device.
1da177e4
LT		 3493 *
3494 * Interprets and directly executes a select list of SCSI commands
3495 * that can be handled internally.
3496 *
3497 * LOCKING:
cca3974e 3498 * spin_lock_irqsave(host lock)
1da177e4
LT		 3499 */
3500
b27dcfb0 3501void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
1da177e4
LT		 3502{
3503 struct ata_scsi_args args;
057ace5e 3504 const u8 *scsicmd = cmd->cmnd;
45394145 3505 u8 tmp8;
1da177e4 3506
9a3dccc4
TH		 3507 args.dev = dev;
3508 args.id = dev->id;
1da177e4 3509 args.cmd = cmd;
b27dcfb0 3510 args.done = cmd->scsi_done;
1da177e4
LT		 3511
3512 switch(scsicmd[0]) {
2dcb407e
JG		 3513 /* TODO: worth improving? */
3514 case FORMAT_UNIT:
b27dcfb0 3515 ata_scsi_invalid_field(cmd);
2dcb407e
JG		 3516 break;
3517
3518 case INQUIRY:
3519 if (scsicmd[1] & 2) /* is CmdDt set? */
b27dcfb0 3520 ata_scsi_invalid_field(cmd);
2dcb407e
JG		 3521 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3522 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3523 else switch (scsicmd[2]) {
3524 case 0x00:
3525 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
1da177e4 3526 break;
2dcb407e
JG		 3527 case 0x80:
3528 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
1da177e4 3529 break;
2dcb407e
JG		 3530 case 0x83:
3531 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
1da177e4 3532 break;
2dcb407e
JG		 3533 case 0x89:
3534 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3535 break;
18f0f978
CH		 3536 case 0xb0:
3537 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
3538 break;
1e9dbc92
MW		 3539 case 0xb1:
3540 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3541 break;
02e0a604
MP		 3542 case 0xb2:
3543 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
3544 break;
2dcb407e 3545 default:
b27dcfb0 3546 ata_scsi_invalid_field(cmd);
1da177e4 3547 break;
2dcb407e
JG		 3548 }
3549 break;
3550
3551 case MODE_SENSE:
3552 case MODE_SENSE_10:
3553 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3554 break;
3555
2dcb407e
JG		 3556 case READ_CAPACITY:
3557 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3558 break;
3559
3560 case SERVICE_ACTION_IN:
3561 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
1da177e4 3562 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2dcb407e 3563 else
b27dcfb0 3564 ata_scsi_invalid_field(cmd);
2dcb407e 3565 break;
1da177e4 3566
2dcb407e
JG		 3567 case REPORT_LUNS:
3568 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3569 break;
1da177e4 3570
2dcb407e
JG		 3571 case REQUEST_SENSE:
3572 ata_scsi_set_sense(cmd, 0, 0, 0);
3573 cmd->result = (DRIVER_SENSE << 24);
b27dcfb0 3574 cmd->scsi_done(cmd);
2dcb407e 3575 break;
1da177e4 3576
2dcb407e
JG		 3577 /* if we reach this, then writeback caching is disabled,
3578 * turning this into a no-op.
3579 */
3580 case SYNCHRONIZE_CACHE:
3581 /* fall through */
3582
3583 /* no-op's, complete with success */
3584 case REZERO_UNIT:
3585 case SEEK_6:
3586 case SEEK_10:
3587 case TEST_UNIT_READY:
3588 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3589 break;
45394145 3590
2dcb407e
JG		 3591 case SEND_DIAGNOSTIC:
3592 tmp8 = scsicmd[1] & ~(1 << 3);
3593 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
00bd0202 3594 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
2dcb407e 3595 else
b27dcfb0 3596 ata_scsi_invalid_field(cmd);
2dcb407e 3597 break;
1da177e4 3598
2dcb407e
JG		 3599 /* all other commands */
3600 default:
3601 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3602 /* "Invalid command operation code" */
b27dcfb0 3603 cmd->scsi_done(cmd);
2dcb407e 3604 break;
1da177e4
LT		 3605 }
3606}
3607
f3187195
TH		 3608int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3609{
3610 int i, rc;
3611
3612 for (i = 0; i < host->n_ports; i++) {
3613 struct ata_port *ap = host->ports[i];
3614 struct Scsi_Host *shost;
3615
3616 rc = -ENOMEM;
3617 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3618 if (!shost)
3619 goto err_alloc;
3620
9ee4f393 3621 shost->eh_noresume = 1;
f3187195
TH		 3622 *(struct ata_port **)&shost->hostdata[0] = ap;
3623 ap->scsi_host = shost;
3624
d9027470 3625 shost->transportt = ata_scsi_transport_template;
f3187195
TH		 3626 shost->unique_id = ap->print_id;
3627 shost->max_id = 16;
3628 shost->max_lun = 1;
3629 shost->max_channel = 1;
3630 shost->max_cmd_len = 16;
8562d028 3631 shost->no_write_same = 1;
f3187195 3632
31cc23b3
TH		 3633 /* Schedule policy is determined by ->qc_defer()
3634 * callback and it needs to see every deferred qc.
3635 * Set host_blocked to 1 to prevent SCSI midlayer from
3636 * automatically deferring requests.
3637 */
3638 shost->max_host_blocked = 1;
3639
f8fc75dc
LM		 3640 rc = scsi_add_host_with_dma(ap->scsi_host,
3641 &ap->tdev, ap->host->dev);
f3187195
TH		 3642 if (rc)
3643 goto err_add;
3644 }
3645
3646 return 0;
3647
3648 err_add:
3649 scsi_host_put(host->ports[i]->scsi_host);
3650 err_alloc:
3651 while (--i >= 0) {
3652 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3653
3654 scsi_remove_host(shost);
3655 scsi_host_put(shost);
3656 }
3657 return rc;
3658}
3659
1ae46317 3660void ata_scsi_scan_host(struct ata_port *ap, int sync)
644dd0cc 3661{
1ae46317
TH		 3662 int tries = 5;
3663 struct ata_device *last_failed_dev = NULL;
41bda9c9 3664 struct ata_link *link;
1ae46317 3665 struct ata_device *dev;
644dd0cc 3666
1ae46317 3667 repeat:
1eca4365
TH		 3668 ata_for_each_link(link, ap, EDGE) {
3669 ata_for_each_dev(dev, link, ENABLED) {
41bda9c9
TH		 3670 struct scsi_device *sdev;
3671 int channel = 0, id = 0;
3edebac4 3672
1eca4365 3673 if (dev->sdev)
41bda9c9 3674 continue;
3f19ee8c 3675
41bda9c9
TH		 3676 if (ata_is_host_link(link))
3677 id = dev->devno;
3678 else
3679 channel = link->pmp;
3680
3681 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3682 NULL);
3683 if (!IS_ERR(sdev)) {
3684 dev->sdev = sdev;
3685 scsi_device_put(sdev);
7381fe73
AL		 3686 if (zpodd_dev_enabled(dev))
3687 dev_pm_qos_expose_flags(
3688 &sdev->sdev_gendev, 0);
295124dc
GG		 3689 } else {
3690 dev->sdev = NULL;
41bda9c9 3691 }
3edebac4 3692 }
3f19ee8c 3693 }
1ae46317
TH		 3694
3695 /* If we scanned while EH was in progress or allocation
3696 * failure occurred, scan would have failed silently. Check
3697 * whether all devices are attached.
3698 */
1eca4365
TH		 3699 ata_for_each_link(link, ap, EDGE) {
3700 ata_for_each_dev(dev, link, ENABLED) {
3701 if (!dev->sdev)
41bda9c9
TH		 3702 goto exit_loop;
3703 }
1ae46317 3704 }
41bda9c9
TH		 3705 exit_loop:
3706 if (!link)
1ae46317
TH		 3707 return;
3708
3709 /* we're missing some SCSI devices */
3710 if (sync) {
3711 /* If caller requested synchrnous scan && we've made
3712 * any progress, sleep briefly and repeat.
3713 */
3714 if (dev != last_failed_dev) {
3715 msleep(100);
3716 last_failed_dev = dev;
3717 goto repeat;
3718 }
3719
3720 /* We might be failing to detect boot device, give it
3721 * a few more chances.
3722 */
3723 if (--tries) {
3724 msleep(100);
3725 goto repeat;
3726 }
3727
a9a79dfe
JP		 3728 ata_port_err(ap,
3729 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
1ae46317
TH		 3730 }
3731
ad72cf98 3732 queue_delayed_work(system_long_wq, &ap->hotplug_task,
1ae46317 3733 round_jiffies_relative(HZ));
644dd0cc 3734}
0ea035a3
TH		 3735
3736/**
3737 * ata_scsi_offline_dev - offline attached SCSI device
3738 * @dev: ATA device to offline attached SCSI device for
3739 *
3740 * This function is called from ata_eh_hotplug() and responsible
3741 * for taking the SCSI device attached to @dev offline. This
cca3974e 3742 * function is called with host lock which protects dev->sdev
0ea035a3
TH		 3743 * against clearing.
3744 *
3745 * LOCKING:
cca3974e 3746 * spin_lock_irqsave(host lock)
0ea035a3
TH		 3747 *
3748 * RETURNS:
3749 * 1 if attached SCSI device exists, 0 otherwise.
3750 */
3751int ata_scsi_offline_dev(struct ata_device *dev)
3752{
3753 if (dev->sdev) {
3754 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3755 return 1;
3756 }
3757 return 0;
3758}
580b2102
TH		 3759
3760/**
3761 * ata_scsi_remove_dev - remove attached SCSI device
3762 * @dev: ATA device to remove attached SCSI device for
3763 *
3764 * This function is called from ata_eh_scsi_hotplug() and
3765 * responsible for removing the SCSI device attached to @dev.
3766 *
3767 * LOCKING:
3768 * Kernel thread context (may sleep).
3769 */
3770static void ata_scsi_remove_dev(struct ata_device *dev)
3771{
9af5c9c9 3772 struct ata_port *ap = dev->link->ap;
580b2102
TH		 3773 struct scsi_device *sdev;
3774 unsigned long flags;
3775
3776 /* Alas, we need to grab scan_mutex to ensure SCSI device
3777 * state doesn't change underneath us and thus
3778 * scsi_device_get() always succeeds. The mutex locking can
3779 * be removed if there is __scsi_device_get() interface which
3780 * increments reference counts regardless of device state.
3781 */
cca3974e 3782 mutex_lock(&ap->scsi_host->scan_mutex);
ba6a1308 3783 spin_lock_irqsave(ap->lock, flags);
580b2102 3784
afe75951
AL		 3785 if (zpodd_dev_enabled(dev))
3786 zpodd_exit(dev);
3bd46600 3787
cca3974e 3788 /* clearing dev->sdev is protected by host lock */
580b2102
TH		 3789 sdev = dev->sdev;
3790 dev->sdev = NULL;
3791
3792 if (sdev) {
3793 /* If user initiated unplug races with us, sdev can go
cca3974e 3794 * away underneath us after the host lock and
580b2102
TH		 3795 * scan_mutex are released. Hold onto it.
3796 */
3797 if (scsi_device_get(sdev) == 0) {
3798 /* The following ensures the attached sdev is
3799 * offline on return from ata_scsi_offline_dev()
3800 * regardless it wins or loses the race
3801 * against this function.
3802 */
3803 scsi_device_set_state(sdev, SDEV_OFFLINE);
3804 } else {
3805 WARN_ON(1);
3806 sdev = NULL;
3807 }
3808 }
3809
ba6a1308 3810 spin_unlock_irqrestore(ap->lock, flags);
cca3974e 3811 mutex_unlock(&ap->scsi_host->scan_mutex);
580b2102
TH		 3812
3813 if (sdev) {
a9a79dfe
JP		 3814 ata_dev_info(dev, "detaching (SCSI %s)\n",
3815 dev_name(&sdev->sdev_gendev));
580b2102
TH		 3816
3817 scsi_remove_device(sdev);
3818 scsi_device_put(sdev);
3819 }
3820}
3821
41bda9c9
TH		 3822static void ata_scsi_handle_link_detach(struct ata_link *link)
3823{
3824 struct ata_port *ap = link->ap;
3825 struct ata_device *dev;
3826
1eca4365 3827 ata_for_each_dev(dev, link, ALL) {
41bda9c9
TH		 3828 unsigned long flags;
3829
3830 if (!(dev->flags & ATA_DFLAG_DETACHED))
3831 continue;
3832
3833 spin_lock_irqsave(ap->lock, flags);
3834 dev->flags &= ~ATA_DFLAG_DETACHED;
3835 spin_unlock_irqrestore(ap->lock, flags);
3836
3837 ata_scsi_remove_dev(dev);
3838 }
3839}
3840
2f294968
KCA		 3841/**
3842 * ata_scsi_media_change_notify - send media change event
c5d0e6a0 3843 * @dev: Pointer to the disk device with media change event
2f294968
KCA		 3844 *
3845 * Tell the block layer to send a media change notification
3846 * event.
3847 *
3848 * LOCKING:
854c73a2 3849 * spin_lock_irqsave(host lock)
2f294968 3850 */
854c73a2 3851void ata_scsi_media_change_notify(struct ata_device *dev)
2f294968 3852{
854c73a2 3853 if (dev->sdev)
f26792d5
JG		 3854 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3855 GFP_ATOMIC);
2f294968 3856}
2f294968 3857
580b2102
TH		 3858/**
3859 * ata_scsi_hotplug - SCSI part of hotplug
65f27f38 3860 * @work: Pointer to ATA port to perform SCSI hotplug on
580b2102
TH		 3861 *
3862 * Perform SCSI part of hotplug. It's executed from a separate
3863 * workqueue after EH completes. This is necessary because SCSI
3864 * hot plugging requires working EH and hot unplugging is
3865 * synchronized with hot plugging with a mutex.
3866 *
3867 * LOCKING:
3868 * Kernel thread context (may sleep).
3869 */
65f27f38 3870void ata_scsi_hotplug(struct work_struct *work)
580b2102 3871{
65f27f38
DH		 3872 struct ata_port *ap =
3873 container_of(work, struct ata_port, hotplug_task.work);
41bda9c9 3874 int i;
580b2102 3875
b51e9e5d 3876 if (ap->pflags & ATA_PFLAG_UNLOADING) {
580b2102
TH		 3877 DPRINTK("ENTER/EXIT - unloading\n");
3878 return;
3879 }
3880
4e7255f3
TH		 3881 /*
3882 * XXX - UGLY HACK
3883 *
3884 * The block layer suspend/resume path is fundamentally broken due
3885 * to freezable kthreads and workqueue and may deadlock if a block
3886 * device gets removed while resume is in progress. I don't know
3887 * what the solution is short of removing freezable kthreads and
3888 * workqueues altogether.
3889 *
3890 * The following is an ugly hack to avoid kicking off device
3891 * removal while freezer is active. This is a joke but does avoid
3892 * this particular deadlock scenario.
3893 *
3894 * https://bugzilla.kernel.org/show_bug.cgi?id=62801
3895 * http://marc.info/?l=linux-kernel&m=138695698516487
3896 */
3897#ifdef CONFIG_FREEZER
3898 while (pm_freezing)
3899 msleep(10);
3900#endif
3901
580b2102 3902 DPRINTK("ENTER\n");
ad72cf98 3903 mutex_lock(&ap->scsi_scan_mutex);
580b2102 3904
41bda9c9
TH		 3905 /* Unplug detached devices. We cannot use link iterator here
3906 * because PMP links have to be scanned even if PMP is
3907 * currently not attached. Iterate manually.
3908 */
3909 ata_scsi_handle_link_detach(&ap->link);
3910 if (ap->pmp_link)
3911 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3912 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
580b2102
TH		 3913
3914 /* scan for new ones */
1ae46317 3915 ata_scsi_scan_host(ap, 0);
580b2102 3916
ad72cf98 3917 mutex_unlock(&ap->scsi_scan_mutex);
580b2102
TH		 3918 DPRINTK("EXIT\n");
3919}
83c47bcb
TH		 3920
3921/**
3922 * ata_scsi_user_scan - indication for user-initiated bus scan
3923 * @shost: SCSI host to scan
3924 * @channel: Channel to scan
3925 * @id: ID to scan
3926 * @lun: LUN to scan
3927 *
3928 * This function is called when user explicitly requests bus
3929 * scan. Set probe pending flag and invoke EH.
3930 *
3931 * LOCKING:
3932 * SCSI layer (we don't care)
3933 *
3934 * RETURNS:
3935 * Zero.
3936 */
d9027470
GG		 3937int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3938 unsigned int id, unsigned int lun)
83c47bcb
TH		 3939{
3940 struct ata_port *ap = ata_shost_to_port(shost);
3941 unsigned long flags;
41bda9c9 3942 int devno, rc = 0;
83c47bcb
TH		 3943
3944 if (!ap->ops->error_handler)
3945 return -EOPNOTSUPP;
3946
41bda9c9 3947 if (lun != SCAN_WILD_CARD && lun)
83c47bcb
TH		 3948 return -EINVAL;
3949
071f44b1 3950 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 3951 if (channel != SCAN_WILD_CARD && channel)
3952 return -EINVAL;
3953 devno = id;
3954 } else {
3955 if (id != SCAN_WILD_CARD && id)
3956 return -EINVAL;
3957 devno = channel;
3958 }
3959
ba6a1308 3960 spin_lock_irqsave(ap->lock, flags);
83c47bcb 3961
41bda9c9
TH		 3962 if (devno == SCAN_WILD_CARD) {
3963 struct ata_link *link;
3964
1eca4365 3965 ata_for_each_link(link, ap, EDGE) {
41bda9c9 3966 struct ata_eh_info *ehi = &link->eh_info;
b558eddd 3967 ehi->probe_mask |= ATA_ALL_DEVICES;
cf480626 3968 ehi->action |= ATA_EH_RESET;
41bda9c9 3969 }
83c47bcb 3970 } else {
41bda9c9 3971 struct ata_device *dev = ata_find_dev(ap, devno);
83c47bcb
TH		 3972
3973 if (dev) {
41bda9c9 3974 struct ata_eh_info *ehi = &dev->link->eh_info;
9af5c9c9 3975 ehi->probe_mask |= 1 << dev->devno;
cf480626 3976 ehi->action |= ATA_EH_RESET;
83c47bcb
TH		 3977 } else
3978 rc = -EINVAL;
3979 }
3980
309afcb5 3981 if (rc == 0) {
83c47bcb 3982 ata_port_schedule_eh(ap);
309afcb5
TH		 3983 spin_unlock_irqrestore(ap->lock, flags);
3984 ata_port_wait_eh(ap);
3985 } else
3986 spin_unlock_irqrestore(ap->lock, flags);
83c47bcb
TH		 3987
3988 return rc;
3989}
3057ac3c 3990
3991/**
d0171269 3992 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
65f27f38 3993 * @work: Pointer to ATA port to perform scsi_rescan_device()
3057ac3c 3994 *
d0171269 3995 * After ATA pass thru (SAT) commands are executed successfully,
ad72cf98 3996 * libata need to propagate the changes to SCSI layer.
3057ac3c 3997 *
d0171269
TH		 3998 * LOCKING:
3999 * Kernel thread context (may sleep).
3057ac3c 4000 */
65f27f38 4001void ata_scsi_dev_rescan(struct work_struct *work)
3057ac3c 4002{
65f27f38
DH		 4003 struct ata_port *ap =
4004 container_of(work, struct ata_port, scsi_rescan_task);
41bda9c9 4005 struct ata_link *link;
f58229f8 4006 struct ata_device *dev;
f84e7e41 4007 unsigned long flags;
3057ac3c 4008
ad72cf98 4009 mutex_lock(&ap->scsi_scan_mutex);
f84e7e41
TH		 4010 spin_lock_irqsave(ap->lock, flags);
4011
1eca4365
TH		 4012 ata_for_each_link(link, ap, EDGE) {
4013 ata_for_each_dev(dev, link, ENABLED) {
41bda9c9 4014 struct scsi_device *sdev = dev->sdev;
3057ac3c 4015
1eca4365 4016 if (!sdev)
41bda9c9
TH		 4017 continue;
4018 if (scsi_device_get(sdev))
4019 continue;
f84e7e41 4020
41bda9c9
TH		 4021 spin_unlock_irqrestore(ap->lock, flags);
4022 scsi_rescan_device(&(sdev->sdev_gendev));
4023 scsi_device_put(sdev);
4024 spin_lock_irqsave(ap->lock, flags);
4025 }
3057ac3c 4026 }
f84e7e41
TH		 4027
4028 spin_unlock_irqrestore(ap->lock, flags);
ad72cf98 4029 mutex_unlock(&ap->scsi_scan_mutex);
3057ac3c 4030}
80289167
BK		 4031
4032/**
4033 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
4f931374 4034 * @host: ATA host container for all SAS ports
80289167 4035 * @port_info: Information from low-level host driver
cca3974e 4036 * @shost: SCSI host that the scsi device is attached to
80289167
BK		 4037 *
4038 * LOCKING:
4039 * PCI/etc. bus probe sem.
4040 *
4041 * RETURNS:
4042 * ata_port pointer on success / NULL on failure.
4043 */
4044
cca3974e 4045struct ata_port *ata_sas_port_alloc(struct ata_host *host,
80289167 4046 struct ata_port_info *port_info,
cca3974e 4047 struct Scsi_Host *shost)
80289167 4048{
f3187195 4049 struct ata_port *ap;
80289167 4050
f3187195 4051 ap = ata_port_alloc(host);
80289167
BK		 4052 if (!ap)
4053 return NULL;
4054
f3187195 4055 ap->port_no = 0;
a29b5dad 4056 ap->lock = &host->lock;
f3187195
TH		 4057 ap->pio_mask = port_info->pio_mask;
4058 ap->mwdma_mask = port_info->mwdma_mask;
4059 ap->udma_mask = port_info->udma_mask;
4060 ap->flags |= port_info->flags;
4061 ap->ops = port_info->port_ops;
4062 ap->cbl = ATA_CBL_SATA;
4063
80289167
BK		 4064 return ap;
4065}
4066EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
4067
4068/**
4069 * ata_sas_port_start - Set port up for dma.
4070 * @ap: Port to initialize
4071 *
4072 * Called just after data structures for each port are
dde20207 4073 * initialized.
80289167
BK		 4074 *
4075 * May be used as the port_start() entry in ata_port_operations.
4076 *
4077 * LOCKING:
4078 * Inherited from caller.
4079 */
4080int ata_sas_port_start(struct ata_port *ap)
4081{
3f1e046a
NA		 4082 /*
4083 * the port is marked as frozen at allocation time, but if we don't
4084 * have new eh, we won't thaw it
4085 */
4086 if (!ap->ops->error_handler)
4087 ap->pflags &= ~ATA_PFLAG_FROZEN;
dde20207 4088 return 0;
80289167
BK		 4089}
4090EXPORT_SYMBOL_GPL(ata_sas_port_start);
4091
4092/**
4093 * ata_port_stop - Undo ata_sas_port_start()
4094 * @ap: Port to shut down
4095 *
80289167
BK		 4096 * May be used as the port_stop() entry in ata_port_operations.
4097 *
4098 * LOCKING:
4099 * Inherited from caller.
4100 */
4101
4102void ata_sas_port_stop(struct ata_port *ap)
4103{
80289167
BK		 4104}
4105EXPORT_SYMBOL_GPL(ata_sas_port_stop);
4106
b2024459
DW		 4107/**
4108 * ata_sas_async_probe - simply schedule probing and return
4109 * @ap: Port to probe
4110 *
4111 * For batch scheduling of probe for sas attached ata devices, assumes
4112 * the port has already been through ata_sas_port_init()
4113 */
4114void ata_sas_async_probe(struct ata_port *ap)
9508a66f 4115{
b2024459
DW		 4116 __ata_port_probe(ap);
4117}
4118EXPORT_SYMBOL_GPL(ata_sas_async_probe);
9508a66f 4119
b2024459
DW		 4120int ata_sas_sync_probe(struct ata_port *ap)
4121{
4122 return ata_port_probe(ap);
9508a66f 4123}
b2024459
DW		 4124EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
4125
9508a66f 4126
80289167
BK		 4127/**
4128 * ata_sas_port_init - Initialize a SATA device
4129 * @ap: SATA port to initialize
4130 *
4131 * LOCKING:
4132 * PCI/etc. bus probe sem.
4133 *
4134 * RETURNS:
4135 * Zero on success, non-zero on error.
4136 */
4137
4138int ata_sas_port_init(struct ata_port *ap)
4139{
4140 int rc = ap->ops->port_start(ap);
4141
b2024459
DW		 4142 if (rc)
4143 return rc;
4144 ap->print_id = atomic_inc_return(&ata_print_id);
4145 return 0;
80289167
BK		 4146}
4147EXPORT_SYMBOL_GPL(ata_sas_port_init);
4148
4149/**
4150 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
4151 * @ap: SATA port to destroy
4152 *
4153 */
4154
4155void ata_sas_port_destroy(struct ata_port *ap)
4156{
f0d36efd
TH		 4157 if (ap->ops->port_stop)
4158 ap->ops->port_stop(ap);
80289167
BK		 4159 kfree(ap);
4160}
4161EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
4162
4163/**
4164 * ata_sas_slave_configure - Default slave_config routine for libata devices
4165 * @sdev: SCSI device to configure
4166 * @ap: ATA port to which SCSI device is attached
4167 *
4168 * RETURNS:
4169 * Zero.
4170 */
4171
4172int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
4173{
4174 ata_scsi_sdev_config(sdev);
9af5c9c9 4175 ata_scsi_dev_config(sdev, ap->link.device);
80289167
BK		 4176 return 0;
4177}
4178EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
4179
4180/**
4181 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
4182 * @cmd: SCSI command to be sent
80289167
BK		 4183 * @ap: ATA port to which the command is being sent
4184 *
4185 * RETURNS:
08475a19
BK		 4186 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4187 * 0 otherwise.
80289167
BK		 4188 */
4189
b27dcfb0 4190int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
80289167 4191{
08475a19
BK		 4192 int rc = 0;
4193
80289167
BK		 4194 ata_scsi_dump_cdb(ap, cmd);
4195
2486fa56 4196 if (likely(ata_dev_enabled(ap->link.device)))
b27dcfb0 4197 rc = __ata_scsi_queuecmd(cmd, ap->link.device);
80289167
BK		 4198 else {
4199 cmd->result = (DID_BAD_TARGET << 16);
b27dcfb0 4200 cmd->scsi_done(cmd);
80289167 4201 }
08475a19 4202 return rc;
80289167
BK		 4203}
4204EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
kernel source for telekom puls (alcatel/mediatek)