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Merge tag 'v3.10.93' 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{
1da177e4 676 int val = -EINVAL, rc = -EINVAL;
e3cf95dd 677 unsigned long flags;
1da177e4 678
1da177e4
LT		 679 switch (cmd) {
680 case ATA_IOC_GET_IO32:
e3cf95dd
AC		 681 spin_lock_irqsave(ap->lock, flags);
682 val = ata_ioc32(ap);
683 spin_unlock_irqrestore(ap->lock, flags);
1da177e4
LT		 684 if (copy_to_user(arg, &val, 1))
685 return -EFAULT;
686 return 0;
687
688 case ATA_IOC_SET_IO32:
689 val = (unsigned long) arg;
e3cf95dd
AC		 690 rc = 0;
691 spin_lock_irqsave(ap->lock, flags);
692 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
693 if (val)
694 ap->pflags |= ATA_PFLAG_PIO32;
695 else
696 ap->pflags &= ~ATA_PFLAG_PIO32;
697 } else {
698 if (val != ata_ioc32(ap))
699 rc = -EINVAL;
700 }
701 spin_unlock_irqrestore(ap->lock, flags);
702 return rc;
1da177e4 703
5924b74c 704 case HDIO_GET_IDENTITY:
94be9a58 705 return ata_get_identity(ap, scsidev, arg);
5924b74c 706
b095518e
JG		 707 case HDIO_DRIVE_CMD:
708 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
709 return -EACCES;
710 return ata_cmd_ioctl(scsidev, arg);
711
712 case HDIO_DRIVE_TASK:
713 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
714 return -EACCES;
715 return ata_task_ioctl(scsidev, arg);
716
1da177e4
LT		 717 default:
718 rc = -ENOTTY;
719 break;
720 }
721
1da177e4
LT		 722 return rc;
723}
94be9a58
JG		 724EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
725
726int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
727{
728 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
729 scsidev, cmd, arg);
730}
731EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
1da177e4
LT		 732
733/**
734 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
1da177e4
LT		 735 * @dev: ATA device to which the new command is attached
736 * @cmd: SCSI command that originated this ATA command
1da177e4
LT		 737 *
738 * Obtain a reference to an unused ata_queued_cmd structure,
739 * which is the basic libata structure representing a single
740 * ATA command sent to the hardware.
741 *
742 * If a command was available, fill in the SCSI-specific
743 * portions of the structure with information on the
744 * current command.
745 *
746 * LOCKING:
cca3974e 747 * spin_lock_irqsave(host lock)
1da177e4
LT		 748 *
749 * RETURNS:
750 * Command allocated, or %NULL if none available.
751 */
7102d230 752static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
b27dcfb0 753 struct scsi_cmnd *cmd)
1da177e4
LT		 754{
755 struct ata_queued_cmd *qc;
756
8a8bc223 757 qc = ata_qc_new_init(dev);
1da177e4
LT		 758 if (qc) {
759 qc->scsicmd = cmd;
b27dcfb0 760 qc->scsidone = cmd->scsi_done;
1da177e4 761
ff2aeb1e 762 qc->sg = scsi_sglist(cmd);
7120165c 763 qc->n_elem = scsi_sg_count(cmd);
1da177e4
LT		 764 } else {
765 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
b27dcfb0 766 cmd->scsi_done(cmd);
1da177e4
LT		 767 }
768
769 return qc;
770}
771
aacda375
TH		 772static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
773{
774 struct scsi_cmnd *scmd = qc->scsicmd;
775
776 qc->extrabytes = scmd->request->extra_len;
777 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
778}
779
b095518e
JG		 780/**
781 * ata_dump_status - user friendly display of error info
782 * @id: id of the port in question
783 * @tf: ptr to filled out taskfile
784 *
785 * Decode and dump the ATA error/status registers for the user so
786 * that they have some idea what really happened at the non
787 * make-believe layer.
788 *
789 * LOCKING:
790 * inherited from caller
791 */
7102d230 792static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
b095518e
JG		 793{
794 u8 stat = tf->command, err = tf->feature;
795
796 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
797 if (stat & ATA_BUSY) {
798 printk("Busy }\n"); /* Data is not valid in this case */
799 } else {
800 if (stat & 0x40) printk("DriveReady ");
801 if (stat & 0x20) printk("DeviceFault ");
802 if (stat & 0x10) printk("SeekComplete ");
803 if (stat & 0x08) printk("DataRequest ");
804 if (stat & 0x04) printk("CorrectedError ");
805 if (stat & 0x02) printk("Index ");
806 if (stat & 0x01) printk("Error ");
807 printk("}\n");
808
809 if (err) {
810 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
811 if (err & 0x04) printk("DriveStatusError ");
812 if (err & 0x80) {
813 if (err & 0x04) printk("BadCRC ");
814 else printk("Sector ");
815 }
816 if (err & 0x40) printk("UncorrectableError ");
817 if (err & 0x10) printk("SectorIdNotFound ");
818 if (err & 0x02) printk("TrackZeroNotFound ");
819 if (err & 0x01) printk("AddrMarkNotFound ");
820 printk("}\n");
821 }
822 }
823}
824
1da177e4
LT		 825/**
826 * ata_to_sense_error - convert ATA error to SCSI error
8e8b77dd 827 * @id: ATA device number
1da177e4 828 * @drv_stat: value contained in ATA status register
b095518e
JG		 829 * @drv_err: value contained in ATA error register
830 * @sk: the sense key we'll fill out
831 * @asc: the additional sense code we'll fill out
832 * @ascq: the additional sense code qualifier we'll fill out
246619da 833 * @verbose: be verbose
1da177e4 834 *
b095518e
JG		 835 * Converts an ATA error into a SCSI error. Fill out pointers to
836 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
837 * format sense blocks.
1da177e4
LT		 838 *
839 * LOCKING:
cca3974e 840 * spin_lock_irqsave(host lock)
1da177e4 841 */
7102d230
AB		 842static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
843 u8 *asc, u8 *ascq, int verbose)
1da177e4 844{
b095518e 845 int i;
ffe75ef6 846
1da177e4 847 /* Based on the 3ware driver translation table */
98ac62de 848 static const unsigned char sense_table[][4] = {
1da177e4
LT		 849 /* BBD|ECC|ID|MAR */
850 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
851 /* BBD|ECC|ID */
852 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
853 /* ECC|MC|MARK */
854 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
855 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
856 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
857 /* MC|ID|ABRT|TRK0|MARK */
858 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
859 /* MCR|MARK */
860 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
861 /* Bad address mark */
862 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
863 /* TRK0 */
864 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
865 /* Abort & !ICRC */
866 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
867 /* Media change request */
868 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
869 /* SRV */
870 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
871 /* Media change */
872 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
873 /* ECC */
874 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
875 /* BBD - block marked bad */
876 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
877 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
878 };
98ac62de 879 static const unsigned char stat_table[][4] = {
1da177e4
LT		 880 /* Must be first because BUSY means no other bits valid */
881 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
882 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
883 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
884 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
885 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
886 };
1da177e4 887
1da177e4
LT		 888 /*
889 * Is this an error we can process/parse
890 */
b095518e
JG		 891 if (drv_stat & ATA_BUSY) {
892 drv_err = 0; /* Ignore the err bits, they're invalid */
1da177e4 893 }
b095518e
JG		 894
895 if (drv_err) {
896 /* Look for drv_err */
897 for (i = 0; sense_table[i][0] != 0xFF; i++) {
898 /* Look for best matches first */
2e9edbf8 899 if ((sense_table[i][0] & drv_err) ==
b095518e
JG		 900 sense_table[i][0]) {
901 *sk = sense_table[i][1];
902 *asc = sense_table[i][2];
903 *ascq = sense_table[i][3];
904 goto translate_done;
905 }
906 }
907 /* No immediate match */
246619da
TH		 908 if (verbose)
909 printk(KERN_WARNING "ata%u: no sense translation for "
910 "error 0x%02x\n", id, drv_err);
1da177e4 911 }
b095518e
JG		 912
913 /* Fall back to interpreting status bits */
914 for (i = 0; stat_table[i][0] != 0xFF; i++) {
915 if (stat_table[i][0] & drv_stat) {
916 *sk = stat_table[i][1];
917 *asc = stat_table[i][2];
918 *ascq = stat_table[i][3];
919 goto translate_done;
1da177e4 920 }
b095518e
JG		 921 }
922 /* No error? Undecoded? */
246619da
TH		 923 if (verbose)
924 printk(KERN_WARNING "ata%u: no sense translation for "
925 "status: 0x%02x\n", id, drv_stat);
b095518e 926
2d202024
AC		 927 /* We need a sensible error return here, which is tricky, and one
928 that won't cause people to do things like return a disk wrongly */
929 *sk = ABORTED_COMMAND;
930 *asc = 0x00;
931 *ascq = 0x00;
b095518e
JG		 932
933 translate_done:
246619da
TH		 934 if (verbose)
935 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
936 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
937 id, drv_stat, drv_err, *sk, *asc, *ascq);
b095518e
JG		 938 return;
939}
940
941/*
750426aa 942 * ata_gen_passthru_sense - Generate check condition sense block.
b095518e
JG		 943 * @qc: Command that completed.
944 *
945 * This function is specific to the ATA descriptor format sense
946 * block specified for the ATA pass through commands. Regardless
947 * of whether the command errored or not, return a sense
948 * block. Copy all controller registers into the sense
84a9a8cd
GG		 949 * block. If there was no error, we get the request from an ATA
950 * passthrough command, so we use the following sense data:
951 * sk = RECOVERED ERROR
952 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
953 *
b095518e
JG		 954 *
955 * LOCKING:
750426aa 956 * None.
b095518e 957 */
750426aa 958static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
b095518e
JG		 959{
960 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 961 struct ata_taskfile *tf = &qc->result_tf;
b095518e
JG		 962 unsigned char *sb = cmd->sense_buffer;
963 unsigned char *desc = sb + 8;
246619da 964 int verbose = qc->ap->ops->error_handler == NULL;
b095518e
JG		 965
966 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
967
0e5dec47 968 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 969
b095518e
JG		 970 /*
971 * Use ata_to_sense_error() to map status register bits
972 * onto sense key, asc & ascq.
973 */
058e55e1
TH		 974 if (qc->err_mask ||
975 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
44877b4e 976 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
246619da 977 &sb[1], &sb[2], &sb[3], verbose);
b095518e 978 sb[1] &= 0x0f;
84a9a8cd
GG		 979 } else {
980 sb[1] = RECOVERED_ERROR;
981 sb[2] = 0;
982 sb[3] = 0x1D;
1da177e4
LT		 983 }
984
b095518e
JG		 985 /*
986 * Sense data is current and format is descriptor.
987 */
988 sb[0] = 0x72;
1da177e4 989
b095518e
JG		 990 desc[0] = 0x09;
991
f38621b3
TH		 992 /* set length of additional sense data */
993 sb[7] = 14;
994 desc[1] = 12;
b095518e
JG		 995
996 /*
997 * Copy registers into sense buffer.
998 */
999 desc[2] = 0x00;
1000 desc[3] = tf->feature; /* == error reg */
1001 desc[5] = tf->nsect;
1002 desc[7] = tf->lbal;
1003 desc[9] = tf->lbam;
1004 desc[11] = tf->lbah;
1005 desc[12] = tf->device;
1006 desc[13] = tf->command; /* == status reg */
1007
1008 /*
1009 * Fill in Extend bit, and the high order bytes
1010 * if applicable.
1011 */
1012 if (tf->flags & ATA_TFLAG_LBA48) {
1013 desc[2] |= 0x01;
1014 desc[4] = tf->hob_nsect;
1015 desc[6] = tf->hob_lbal;
1016 desc[8] = tf->hob_lbam;
1017 desc[10] = tf->hob_lbah;
1da177e4 1018 }
b095518e 1019}
1da177e4 1020
b095518e 1021/**
750426aa 1022 * ata_gen_ata_sense - generate a SCSI fixed sense block
b095518e
JG		 1023 * @qc: Command that we are erroring out
1024 *
d25614ba 1025 * Generate sense block for a failed ATA command @qc. Descriptor
25985edc 1026 * format is used to accommodate LBA48 block address.
b095518e
JG		 1027 *
1028 * LOCKING:
750426aa 1029 * None.
b095518e 1030 */
750426aa 1031static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
b095518e 1032{
d25614ba 1033 struct ata_device *dev = qc->dev;
b095518e 1034 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 1035 struct ata_taskfile *tf = &qc->result_tf;
b095518e 1036 unsigned char *sb = cmd->sense_buffer;
d25614ba 1037 unsigned char *desc = sb + 8;
246619da 1038 int verbose = qc->ap->ops->error_handler == NULL;
d25614ba 1039 u64 block;
b095518e
JG		 1040
1041 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1042
0e5dec47 1043 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 1044
d25614ba
TH		 1045 /* sense data is current and format is descriptor */
1046 sb[0] = 0x72;
1047
1048 /* Use ata_to_sense_error() to map status register bits
b095518e
JG		 1049 * onto sense key, asc & ascq.
1050 */
058e55e1
TH		 1051 if (qc->err_mask ||
1052 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
44877b4e 1053 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
d25614ba
TH		 1054 &sb[1], &sb[2], &sb[3], verbose);
1055 sb[1] &= 0x0f;
1da177e4 1056 }
1da177e4 1057
d25614ba 1058 block = ata_tf_read_block(&qc->result_tf, dev);
a7dac447 1059
d25614ba
TH		 1060 /* information sense data descriptor */
1061 sb[7] = 12;
1062 desc[0] = 0x00;
1063 desc[1] = 10;
a7dac447 1064
d25614ba
TH		 1065 desc[2] |= 0x80; /* valid */
1066 desc[6] = block >> 40;
1067 desc[7] = block >> 32;
1068 desc[8] = block >> 24;
1069 desc[9] = block >> 16;
1070 desc[10] = block >> 8;
1071 desc[11] = block;
1da177e4
LT		 1072}
1073
a6cce2a7
BK		 1074static void ata_scsi_sdev_config(struct scsi_device *sdev)
1075{
1076 sdev->use_10_for_rw = 1;
1077 sdev->use_10_for_ms = 1;
3c6bdaea 1078 sdev->no_report_opcodes = 1;
5db44863 1079 sdev->no_write_same = 1;
31cc23b3
TH		 1080
1081 /* Schedule policy is determined by ->qc_defer() callback and
1082 * it needs to see every deferred qc. Set dev_blocked to 1 to
1083 * prevent SCSI midlayer from automatically deferring
1084 * requests.
1085 */
1086 sdev->max_device_blocked = 1;
a6cce2a7
BK		 1087}
1088
fa2fc7f4
JB		 1089/**
1090 * atapi_drain_needed - Check whether data transfer may overflow
73fd8b6d 1091 * @rq: request to be checked
fa2fc7f4
JB		 1092 *
1093 * ATAPI commands which transfer variable length data to host
1094 * might overflow due to application error or hardare bug. This
1095 * function checks whether overflow should be drained and ignored
1096 * for @request.
1097 *
1098 * LOCKING:
1099 * None.
1100 *
1101 * RETURNS:
1102 * 1 if ; otherwise, 0.
1103 */
1104static int atapi_drain_needed(struct request *rq)
1105{
33659ebb 1106 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
fa2fc7f4
JB		 1107 return 0;
1108
7b6d91da 1109 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
fa2fc7f4
JB		 1110 return 0;
1111
1112 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1113}
1114
1115static int ata_scsi_dev_config(struct scsi_device *sdev,
1116 struct ata_device *dev)
a6cce2a7 1117{
900e599e 1118 struct request_queue *q = sdev->request_queue;
1119
45fabbb7
EO		 1120 if (!ata_id_has_unload(dev->id))
1121 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1122
914ed354 1123 /* configure max sectors */
900e599e 1124 blk_queue_max_hw_sectors(q, dev->max_sectors);
a6cce2a7 1125
fa2fc7f4 1126 if (dev->class == ATA_DEV_ATAPI) {
fa2fc7f4
JB		 1127 void *buf;
1128
729a6a30
TH		 1129 sdev->sector_size = ATA_SECT_SIZE;
1130
1131 /* set DMA padding */
900e599e 1132 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
fa2fc7f4
JB		 1133
1134 /* configure draining */
1135 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1136 if (!buf) {
a9a79dfe 1137 ata_dev_err(dev, "drain buffer allocation failed\n");
fa2fc7f4
JB		 1138 return -ENOMEM;
1139 }
1140
1141 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1142 } else {
295124dc 1143 sdev->sector_size = ata_id_logical_sector_size(dev->id);
d8cf5389 1144 sdev->manage_start_stop = 1;
dde20207 1145 }
d8cf5389 1146
729a6a30
TH		 1147 /*
1148 * ata_pio_sectors() expects buffer for each sector to not cross
1149 * page boundary. Enforce it by requiring buffers to be sector
1150 * aligned, which works iff sector_size is not larger than
1151 * PAGE_SIZE. ATAPI devices also need the alignment as
1152 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1153 */
1154 if (sdev->sector_size > PAGE_SIZE)
a9a79dfe 1155 ata_dev_warn(dev,
729a6a30
TH		 1156 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1157 sdev->sector_size);
1158
900e599e 1159 blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
729a6a30 1160
f26792d5
JG		 1161 if (dev->flags & ATA_DFLAG_AN)
1162 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1163
a6e6ce8e
TH		 1164 if (dev->flags & ATA_DFLAG_NCQ) {
1165 int depth;
1166
1167 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1168 depth = min(ATA_MAX_QUEUE - 1, depth);
8a8bc223 1169 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
a6e6ce8e 1170 }
fa2fc7f4 1171
900e599e 1172 blk_queue_flush_queueable(q, false);
1173
295124dc 1174 dev->sdev = sdev;
fa2fc7f4 1175 return 0;
a6cce2a7
BK		 1176}
1177
1da177e4
LT		 1178/**
1179 * ata_scsi_slave_config - Set SCSI device attributes
1180 * @sdev: SCSI device to examine
1181 *
1182 * This is called before we actually start reading
1183 * and writing to the device, to configure certain
1184 * SCSI mid-layer behaviors.
1185 *
1186 * LOCKING:
1187 * Defined by SCSI layer. We don't really care.
1188 */
1189
1190int ata_scsi_slave_config(struct scsi_device *sdev)
1191{
31534363
TH		 1192 struct ata_port *ap = ata_shost_to_port(sdev->host);
1193 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
fa2fc7f4 1194 int rc = 0;
31534363 1195
a6cce2a7 1196 ata_scsi_sdev_config(sdev);
1da177e4 1197
31534363 1198 if (dev)
fa2fc7f4 1199 rc = ata_scsi_dev_config(sdev, dev);
1da177e4 1200
fa2fc7f4 1201 return rc;
1da177e4
LT		 1202}
1203
83c47bcb
TH		 1204/**
1205 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1206 * @sdev: SCSI device to be destroyed
1207 *
1208 * @sdev is about to be destroyed for hot/warm unplugging. If
1209 * this unplugging was initiated by libata as indicated by NULL
1210 * dev->sdev, this function doesn't have to do anything.
1211 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1212 * Clear dev->sdev, schedule the device for ATA detach and invoke
1213 * EH.
1214 *
1215 * LOCKING:
1216 * Defined by SCSI layer. We don't really care.
1217 */
1218void ata_scsi_slave_destroy(struct scsi_device *sdev)
1219{
1220 struct ata_port *ap = ata_shost_to_port(sdev->host);
fa2fc7f4 1221 struct request_queue *q = sdev->request_queue;
83c47bcb
TH		 1222 unsigned long flags;
1223 struct ata_device *dev;
1224
1225 if (!ap->ops->error_handler)
1226 return;
1227
ba6a1308 1228 spin_lock_irqsave(ap->lock, flags);
83c47bcb
TH		 1229 dev = __ata_scsi_find_dev(ap, sdev);
1230 if (dev && dev->sdev) {
1231 /* SCSI device already in CANCEL state, no need to offline it */
1232 dev->sdev = NULL;
1233 dev->flags |= ATA_DFLAG_DETACH;
1234 ata_port_schedule_eh(ap);
1235 }
ba6a1308 1236 spin_unlock_irqrestore(ap->lock, flags);
fa2fc7f4
JB		 1237
1238 kfree(q->dma_drain_buffer);
1239 q->dma_drain_buffer = NULL;
1240 q->dma_drain_size = 0;
83c47bcb
TH		 1241}
1242
a6e6ce8e 1243/**
f6e67035 1244 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
6d2dd054
MPS		 1245 * @ap: ATA port to which the device change the queue depth
1246 * @sdev: SCSI device to configure queue depth for
1247 * @queue_depth: new queue depth
1248 * @reason: calling context
a6e6ce8e 1249 *
f6e67035
DW		 1250 * libsas and libata have different approaches for associating a sdev to
1251 * its ata_port.
a6e6ce8e 1252 *
a6e6ce8e 1253 */
f6e67035
DW		 1254int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
1255 int queue_depth, int reason)
a6e6ce8e 1256{
a6e6ce8e 1257 struct ata_device *dev;
360f654e 1258 unsigned long flags;
a6e6ce8e 1259
e881a172
MC		 1260 if (reason != SCSI_QDEPTH_DEFAULT)
1261 return -EOPNOTSUPP;
1262
c3c70c44 1263 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
a6e6ce8e
TH		 1264 return sdev->queue_depth;
1265
1266 dev = ata_scsi_find_dev(ap, sdev);
1267 if (!dev || !ata_dev_enabled(dev))
1268 return sdev->queue_depth;
1269
c3c70c44 1270 /* NCQ enabled? */
360f654e 1271 spin_lock_irqsave(ap->lock, flags);
c3c70c44
TH		 1272 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1273 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
360f654e 1274 dev->flags |= ATA_DFLAG_NCQ_OFF;
c3c70c44
TH		 1275 queue_depth = 1;
1276 }
360f654e
TH		 1277 spin_unlock_irqrestore(ap->lock, flags);
1278
c3c70c44
TH		 1279 /* limit and apply queue depth */
1280 queue_depth = min(queue_depth, sdev->host->can_queue);
1281 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1282 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1283
1284 if (sdev->queue_depth == queue_depth)
1285 return -EINVAL;
1286
1287 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
a6e6ce8e
TH		 1288 return queue_depth;
1289}
1290
f6e67035
DW		 1291/**
1292 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1293 * @sdev: SCSI device to configure queue depth for
1294 * @queue_depth: new queue depth
1295 * @reason: calling context
1296 *
1297 * This is libata standard hostt->change_queue_depth callback.
1298 * SCSI will call into this callback when user tries to set queue
1299 * depth via sysfs.
1300 *
1301 * LOCKING:
1302 * SCSI layer (we don't care)
1303 *
1304 * RETURNS:
1305 * Newly configured queue depth.
1306 */
1307int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth,
1308 int reason)
1309{
1310 struct ata_port *ap = ata_shost_to_port(sdev->host);
1311
1312 return __ata_change_queue_depth(ap, sdev, queue_depth, reason);
1313}
1314
972dcafb
DG		 1315/**
1316 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1317 * @qc: Storage for translated ATA taskfile
972dcafb
DG		 1318 *
1319 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1320 * (to start). Perhaps these commands should be preceded by
1321 * CHECK POWER MODE to see what power mode the device is already in.
1322 * [See SAT revision 5 at www.t10.org]
1323 *
1324 * LOCKING:
cca3974e 1325 * spin_lock_irqsave(host lock)
972dcafb
DG		 1326 *
1327 * RETURNS:
1328 * Zero on success, non-zero on error.
1329 */
ad706991 1330static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
972dcafb 1331{
542b1444 1332 struct scsi_cmnd *scmd = qc->scsicmd;
972dcafb 1333 struct ata_taskfile *tf = &qc->tf;
ad706991 1334 const u8 *cdb = scmd->cmnd;
972dcafb 1335
2e5704f6
TH		 1336 if (scmd->cmd_len < 5)
1337 goto invalid_fld;
1338
972dcafb
DG		 1339 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1340 tf->protocol = ATA_PROT_NODATA;
542b1444 1341 if (cdb[1] & 0x1) {
972dcafb
DG		 1342 ; /* ignore IMMED bit, violates sat-r05 */
1343 }
542b1444 1344 if (cdb[4] & 0x2)
ae006510 1345 goto invalid_fld; /* LOEJ bit set not supported */
542b1444 1346 if (((cdb[4] >> 4) & 0xf) != 0)
ae006510 1347 goto invalid_fld; /* power conditions not supported */
e31e8531 1348
542b1444 1349 if (cdb[4] & 0x1) {
972dcafb 1350 tf->nsect = 1; /* 1 sector, lba=0 */
9d5b1302
AL		 1351
1352 if (qc->dev->flags & ATA_DFLAG_LBA) {
c44078c0 1353 tf->flags |= ATA_TFLAG_LBA;
9d5b1302
AL		 1354
1355 tf->lbah = 0x0;
1356 tf->lbam = 0x0;
1357 tf->lbal = 0x0;
1358 tf->device |= ATA_LBA;
1359 } else {
1360 /* CHS */
1361 tf->lbal = 0x1; /* sect */
1362 tf->lbam = 0x0; /* cyl low */
1363 tf->lbah = 0x0; /* cyl high */
1364 }
1365
972dcafb 1366 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
920a4b10 1367 } else {
2a6e58d2
RW		 1368 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1369 * or S5) causing some drives to spin up and down again.
1370 */
1371 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1372 system_state == SYSTEM_POWER_OFF)
1373 goto skip;
1374
1375 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1376 system_entering_hibernation())
1377 goto skip;
1378
78981a7c
RH		 1379 /* Issue ATA STANDBY IMMEDIATE command */
1380 tf->command = ATA_CMD_STANDBYNOW1;
920a4b10 1381 }
78981a7c 1382
972dcafb
DG		 1383 /*
1384 * Standby and Idle condition timers could be implemented but that
1385 * would require libata to implement the Power condition mode page
1386 * and allow the user to change it. Changing mode pages requires
1387 * MODE SELECT to be implemented.
1388 */
1389
1390 return 0;
ae006510 1391
2a6e58d2 1392 invalid_fld:
542b1444 1393 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1394 /* "Invalid field in cbd" */
1395 return 1;
2a6e58d2
RW		 1396 skip:
1397 scmd->result = SAM_STAT_GOOD;
1398 return 1;
972dcafb
DG		 1399}
1400
1401
1da177e4
LT		 1402/**
1403 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1404 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1405 *
1406 * Sets up an ATA taskfile to issue FLUSH CACHE or
1407 * FLUSH CACHE EXT.
1408 *
1409 * LOCKING:
cca3974e 1410 * spin_lock_irqsave(host lock)
1da177e4
LT		 1411 *
1412 * RETURNS:
1413 * Zero on success, non-zero on error.
1414 */
ad706991 1415static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1da177e4
LT		 1416{
1417 struct ata_taskfile *tf = &qc->tf;
1418
1419 tf->flags |= ATA_TFLAG_DEVICE;
1420 tf->protocol = ATA_PROT_NODATA;
1421
6fc49adb 1422 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1da177e4
LT		 1423 tf->command = ATA_CMD_FLUSH_EXT;
1424 else
1425 tf->command = ATA_CMD_FLUSH;
1426
b666da35
TH		 1427 /* flush is critical for IO integrity, consider it an IO command */
1428 qc->flags |= ATA_QCFLAG_IO;
1429
1da177e4
LT		 1430 return 0;
1431}
1432
3aef5231
AL		 1433/**
1434 * scsi_6_lba_len - Get LBA and transfer length
542b1444 1435 * @cdb: SCSI command to translate
3aef5231
AL		 1436 *
1437 * Calculate LBA and transfer length for 6-byte commands.
1438 *
1439 * RETURNS:
1440 * @plba: the LBA
1441 * @plen: the transfer length
1442 */
542b1444 1443static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1444{
1445 u64 lba = 0;
6c7b7d2b 1446 u32 len;
3aef5231
AL		 1447
1448 VPRINTK("six-byte command\n");
1449
6c7b7d2b 1450 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
542b1444
TH		 1451 lba |= ((u64)cdb[2]) << 8;
1452 lba |= ((u64)cdb[3]);
3aef5231 1453
6c7b7d2b 1454 len = cdb[4];
3aef5231
AL		 1455
1456 *plba = lba;
1457 *plen = len;
1458}
1459
1460/**
1461 * scsi_10_lba_len - Get LBA and transfer length
542b1444 1462 * @cdb: SCSI command to translate
3aef5231
AL		 1463 *
1464 * Calculate LBA and transfer length for 10-byte commands.
1465 *
1466 * RETURNS:
1467 * @plba: the LBA
1468 * @plen: the transfer length
1469 */
542b1444 1470static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1471{
1472 u64 lba = 0;
1473 u32 len = 0;
1474
1475 VPRINTK("ten-byte command\n");
1476
542b1444
TH		 1477 lba |= ((u64)cdb[2]) << 24;
1478 lba |= ((u64)cdb[3]) << 16;
1479 lba |= ((u64)cdb[4]) << 8;
1480 lba |= ((u64)cdb[5]);
3aef5231 1481
542b1444
TH		 1482 len |= ((u32)cdb[7]) << 8;
1483 len |= ((u32)cdb[8]);
3aef5231
AL		 1484
1485 *plba = lba;
1486 *plen = len;
1487}
1488
1489/**
1490 * scsi_16_lba_len - Get LBA and transfer length
542b1444 1491 * @cdb: SCSI command to translate
3aef5231
AL		 1492 *
1493 * Calculate LBA and transfer length for 16-byte commands.
1494 *
1495 * RETURNS:
1496 * @plba: the LBA
1497 * @plen: the transfer length
1498 */
542b1444 1499static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1500{
1501 u64 lba = 0;
1502 u32 len = 0;
1503
1504 VPRINTK("sixteen-byte command\n");
1505
542b1444
TH		 1506 lba |= ((u64)cdb[2]) << 56;
1507 lba |= ((u64)cdb[3]) << 48;
1508 lba |= ((u64)cdb[4]) << 40;
1509 lba |= ((u64)cdb[5]) << 32;
1510 lba |= ((u64)cdb[6]) << 24;
1511 lba |= ((u64)cdb[7]) << 16;
1512 lba |= ((u64)cdb[8]) << 8;
1513 lba |= ((u64)cdb[9]);
3aef5231 1514
542b1444
TH		 1515 len |= ((u32)cdb[10]) << 24;
1516 len |= ((u32)cdb[11]) << 16;
1517 len |= ((u32)cdb[12]) << 8;
1518 len |= ((u32)cdb[13]);
3aef5231
AL		 1519
1520 *plba = lba;
1521 *plen = len;
1522}
1523
1da177e4
LT		 1524/**
1525 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1526 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1527 *
1528 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1529 *
1530 * LOCKING:
cca3974e 1531 * spin_lock_irqsave(host lock)
1da177e4
LT		 1532 *
1533 * RETURNS:
1534 * Zero on success, non-zero on error.
1535 */
ad706991 1536static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1da177e4 1537{
542b1444 1538 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4 1539 struct ata_taskfile *tf = &qc->tf;
8bf62ece 1540 struct ata_device *dev = qc->dev;
1da177e4 1541 u64 dev_sectors = qc->dev->n_sectors;
ad706991 1542 const u8 *cdb = scmd->cmnd;
3aef5231
AL		 1543 u64 block;
1544 u32 n_block;
1da177e4
LT		 1545
1546 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1547 tf->protocol = ATA_PROT_NODATA;
1da177e4 1548
2e5704f6
TH		 1549 if (cdb[0] == VERIFY) {
1550 if (scmd->cmd_len < 10)
1551 goto invalid_fld;
542b1444 1552 scsi_10_lba_len(cdb, &block, &n_block);
2e5704f6
TH		 1553 } else if (cdb[0] == VERIFY_16) {
1554 if (scmd->cmd_len < 16)
1555 goto invalid_fld;
542b1444 1556 scsi_16_lba_len(cdb, &block, &n_block);
2e5704f6 1557 } else
ae006510 1558 goto invalid_fld;
1da177e4 1559
8bf62ece 1560 if (!n_block)
ae006510 1561 goto nothing_to_do;
8bf62ece 1562 if (block >= dev_sectors)
ae006510 1563 goto out_of_range;
8bf62ece 1564 if ((block + n_block) > dev_sectors)
ae006510 1565 goto out_of_range;
1da177e4 1566
07506697
AL		 1567 if (dev->flags & ATA_DFLAG_LBA) {
1568 tf->flags |= ATA_TFLAG_LBA;
1569
c6a33e24
AL		 1570 if (lba_28_ok(block, n_block)) {
1571 /* use LBA28 */
1572 tf->command = ATA_CMD_VERIFY;
1573 tf->device |= (block >> 24) & 0xf;
1574 } else if (lba_48_ok(block, n_block)) {
1575 if (!(dev->flags & ATA_DFLAG_LBA48))
1576 goto out_of_range;
07506697
AL		 1577
1578 /* use LBA48 */
1579 tf->flags |= ATA_TFLAG_LBA48;
8bf62ece 1580 tf->command = ATA_CMD_VERIFY_EXT;
1da177e4 1581
8bf62ece 1582 tf->hob_nsect = (n_block >> 8) & 0xff;
1da177e4 1583
8bf62ece
AL		 1584 tf->hob_lbah = (block >> 40) & 0xff;
1585 tf->hob_lbam = (block >> 32) & 0xff;
1586 tf->hob_lbal = (block >> 24) & 0xff;
c6a33e24
AL		 1587 } else
1588 /* request too large even for LBA48 */
1589 goto out_of_range;
8bf62ece
AL		 1590
1591 tf->nsect = n_block & 0xff;
1da177e4 1592
8bf62ece
AL		 1593 tf->lbah = (block >> 16) & 0xff;
1594 tf->lbam = (block >> 8) & 0xff;
1595 tf->lbal = block & 0xff;
1da177e4 1596
8bf62ece
AL		 1597 tf->device |= ATA_LBA;
1598 } else {
1599 /* CHS */
1600 u32 sect, head, cyl, track;
1601
c6a33e24
AL		 1602 if (!lba_28_ok(block, n_block))
1603 goto out_of_range;
07506697 1604
8bf62ece
AL		 1605 /* Convert LBA to CHS */
1606 track = (u32)block / dev->sectors;
1607 cyl = track / dev->heads;
1608 head = track % dev->heads;
1609 sect = (u32)block % dev->sectors + 1;
1610
c187c4b5
AL		 1611 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1612 (u32)block, track, cyl, head, sect);
2e9edbf8
JG		 1613
1614 /* Check whether the converted CHS can fit.
1615 Cylinder: 0-65535
8bf62ece
AL		 1616 Head: 0-15
1617 Sector: 1-255*/
2e9edbf8 1618 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
ae006510 1619 goto out_of_range;
2e9edbf8 1620
8bf62ece
AL		 1621 tf->command = ATA_CMD_VERIFY;
1622 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1623 tf->lbal = sect;
1624 tf->lbam = cyl;
1625 tf->lbah = cyl >> 8;
1626 tf->device |= head;
1627 }
1da177e4
LT		 1628
1629 return 0;
ae006510
DG		 1630
1631invalid_fld:
542b1444 1632 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1633 /* "Invalid field in cbd" */
1634 return 1;
1635
1636out_of_range:
542b1444 1637 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1638 /* "Logical Block Address out of range" */
1639 return 1;
1640
1641nothing_to_do:
542b1444 1642 scmd->result = SAM_STAT_GOOD;
ae006510 1643 return 1;
1da177e4
LT		 1644}
1645
1646/**
1647 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1648 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1649 *
1650 * Converts any of six SCSI read/write commands into the
1651 * ATA counterpart, including starting sector (LBA),
1652 * sector count, and taking into account the device's LBA48
1653 * support.
1654 *
1655 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1656 * %WRITE_16 are currently supported.
1657 *
1658 * LOCKING:
cca3974e 1659 * spin_lock_irqsave(host lock)
1da177e4
LT		 1660 *
1661 * RETURNS:
1662 * Zero on success, non-zero on error.
1663 */
ad706991 1664static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1da177e4 1665{
542b1444 1666 struct scsi_cmnd *scmd = qc->scsicmd;
ad706991 1667 const u8 *cdb = scmd->cmnd;
bd056d7e 1668 unsigned int tf_flags = 0;
3aef5231
AL		 1669 u64 block;
1670 u32 n_block;
bd056d7e 1671 int rc;
1da177e4 1672
542b1444 1673 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
bd056d7e 1674 tf_flags |= ATA_TFLAG_WRITE;
1da177e4 1675
9a3dccc4 1676 /* Calculate the SCSI LBA, transfer length and FUA. */
542b1444 1677 switch (cdb[0]) {
3aef5231
AL		 1678 case READ_10:
1679 case WRITE_10:
2e5704f6
TH		 1680 if (unlikely(scmd->cmd_len < 10))
1681 goto invalid_fld;
542b1444 1682 scsi_10_lba_len(cdb, &block, &n_block);
3e451a49 1683 if (cdb[1] & (1 << 3))
bd056d7e 1684 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1685 break;
1686 case READ_6:
1687 case WRITE_6:
2e5704f6
TH		 1688 if (unlikely(scmd->cmd_len < 6))
1689 goto invalid_fld;
542b1444 1690 scsi_6_lba_len(cdb, &block, &n_block);
c187c4b5
AL		 1691
1692 /* for 6-byte r/w commands, transfer length 0
1693 * means 256 blocks of data, not 0 block.
1694 */
76b2bf9b
JG		 1695 if (!n_block)
1696 n_block = 256;
3aef5231
AL		 1697 break;
1698 case READ_16:
1699 case WRITE_16:
2e5704f6
TH		 1700 if (unlikely(scmd->cmd_len < 16))
1701 goto invalid_fld;
542b1444 1702 scsi_16_lba_len(cdb, &block, &n_block);
3e451a49 1703 if (cdb[1] & (1 << 3))
bd056d7e 1704 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1705 break;
1706 default:
8bf62ece 1707 DPRINTK("no-byte command\n");
ae006510 1708 goto invalid_fld;
1da177e4
LT		 1709 }
1710
8bf62ece
AL		 1711 /* Check and compose ATA command */
1712 if (!n_block)
c187c4b5
AL		 1713 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1714 * length 0 means transfer 0 block of data.
1715 * However, for ATA R/W commands, sector count 0 means
1716 * 256 or 65536 sectors, not 0 sectors as in SCSI.
f51750d5
AC		 1717 *
1718 * WARNING: one or two older ATA drives treat 0 as 0...
c187c4b5 1719 */
ae006510 1720 goto nothing_to_do;
1da177e4 1721
bd056d7e 1722 qc->flags |= ATA_QCFLAG_IO;
295124dc 1723 qc->nbytes = n_block * scmd->device->sector_size;
1da177e4 1724
bd056d7e
TH		 1725 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1726 qc->tag);
1727 if (likely(rc == 0))
1728 return 0;
ae006510 1729
bd056d7e
TH		 1730 if (rc == -ERANGE)
1731 goto out_of_range;
1732 /* treat all other errors as -EINVAL, fall through */
ae006510 1733invalid_fld:
542b1444 1734 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1735 /* "Invalid field in cbd" */
1736 return 1;
1737
1738out_of_range:
542b1444 1739 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1740 /* "Logical Block Address out of range" */
1741 return 1;
1742
1743nothing_to_do:
542b1444 1744 scmd->result = SAM_STAT_GOOD;
ae006510 1745 return 1;
1da177e4
LT		 1746}
1747
77853bf2 1748static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1da177e4 1749{
c31f571d 1750 struct ata_port *ap = qc->ap;
1da177e4 1751 struct scsi_cmnd *cmd = qc->scsicmd;
a7dac447 1752 u8 *cdb = cmd->cmnd;
2dcb407e 1753 int need_sense = (qc->err_mask != 0);
b095518e
JG		 1754
1755 /* For ATA pass thru (SAT) commands, generate a sense block if
1756 * user mandated it or if there's an error. Note that if we
84a9a8cd
GG		 1757 * generate because the user forced us to [CK_COND =1], a check
1758 * condition is generated and the ATA register values are returned
b095518e 1759 * whether the command completed successfully or not. If there
84a9a8cd
GG		 1760 * was no error, we use the following sense data:
1761 * sk = RECOVERED ERROR
1762 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
b095518e 1763 */
a7dac447 1764 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
2dcb407e 1765 ((cdb[2] & 0x20) || need_sense)) {
750426aa 1766 ata_gen_passthru_sense(qc);
b095518e
JG		 1767 } else {
1768 if (!need_sense) {
1769 cmd->result = SAM_STAT_GOOD;
1770 } else {
1771 /* TODO: decide which descriptor format to use
1772 * for 48b LBA devices and call that here
1773 * instead of the fixed desc, which is only
1774 * good for smaller LBA (and maybe CHS?)
1775 * devices.
1776 */
750426aa 1777 ata_gen_ata_sense(qc);
b095518e
JG		 1778 }
1779 }
1da177e4 1780
c31f571d 1781 if (need_sense && !ap->ops->error_handler)
44877b4e 1782 ata_dump_status(ap->print_id, &qc->result_tf);
1da177e4
LT		 1783
1784 qc->scsidone(cmd);
1785
77853bf2 1786 ata_qc_free(qc);
1da177e4
LT		 1787}
1788
1789/**
1790 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1da177e4
LT		 1791 * @dev: ATA device to which the command is addressed
1792 * @cmd: SCSI command to execute
1da177e4
LT		 1793 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1794 *
1795 * Our ->queuecommand() function has decided that the SCSI
1796 * command issued can be directly translated into an ATA
1797 * command, rather than handled internally.
1798 *
1799 * This function sets up an ata_queued_cmd structure for the
1800 * SCSI command, and sends that ata_queued_cmd to the hardware.
1801 *
ae006510
DG		 1802 * The xlat_func argument (actor) returns 0 if ready to execute
1803 * ATA command, else 1 to finish translation. If 1 is returned
1804 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1805 * to be set reflecting an error condition or clean (early)
1806 * termination.
1807 *
1da177e4 1808 * LOCKING:
cca3974e 1809 * spin_lock_irqsave(host lock)
2115ea94
TH		 1810 *
1811 * RETURNS:
1812 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1813 * needs to be deferred.
1da177e4 1814 */
2115ea94 1815static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
2115ea94 1816 ata_xlat_func_t xlat_func)
1da177e4 1817{
31cc23b3 1818 struct ata_port *ap = dev->link->ap;
1da177e4 1819 struct ata_queued_cmd *qc;
31cc23b3 1820 int rc;
1da177e4
LT		 1821
1822 VPRINTK("ENTER\n");
1823
b27dcfb0 1824 qc = ata_scsi_qc_new(dev, cmd);
1da177e4 1825 if (!qc)
ae006510 1826 goto err_mem;
1da177e4
LT		 1827
1828 /* data is present; dma-map it */
be7db055
CH		 1829 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1830 cmd->sc_data_direction == DMA_TO_DEVICE) {
7120165c 1831 if (unlikely(scsi_bufflen(cmd) < 1)) {
a9a79dfe 1832 ata_dev_warn(dev, "WARNING: zero len r/w req\n");
ae006510 1833 goto err_did;
1da177e4
LT		 1834 }
1835
7120165c 1836 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1da177e4
LT		 1837
1838 qc->dma_dir = cmd->sc_data_direction;
1839 }
1840
1841 qc->complete_fn = ata_scsi_qc_complete;
1842
ad706991 1843 if (xlat_func(qc))
ae006510 1844 goto early_finish;
1da177e4 1845
31cc23b3
TH		 1846 if (ap->ops->qc_defer) {
1847 if ((rc = ap->ops->qc_defer(qc)))
1848 goto defer;
1849 }
1850
1da177e4 1851 /* select device, send command to hardware */
8e0e694a 1852 ata_qc_issue(qc);
1da177e4
LT		 1853
1854 VPRINTK("EXIT\n");
2115ea94 1855 return 0;
1da177e4 1856
ae006510 1857early_finish:
2dcb407e 1858 ata_qc_free(qc);
b27dcfb0 1859 cmd->scsi_done(cmd);
ae006510 1860 DPRINTK("EXIT - early finish (good or error)\n");
2115ea94 1861 return 0;
ae006510
DG		 1862
1863err_did:
1da177e4 1864 ata_qc_free(qc);
ae006510 1865 cmd->result = (DID_ERROR << 16);
b27dcfb0 1866 cmd->scsi_done(cmd);
253b92ec 1867err_mem:
ae006510 1868 DPRINTK("EXIT - internal\n");
2115ea94 1869 return 0;
3dc1d881
TH		 1870
1871defer:
31cc23b3 1872 ata_qc_free(qc);
3dc1d881 1873 DPRINTK("EXIT - defer\n");
31cc23b3
TH		 1874 if (rc == ATA_DEFER_LINK)
1875 return SCSI_MLQUEUE_DEVICE_BUSY;
1876 else
1877 return SCSI_MLQUEUE_HOST_BUSY;
1da177e4
LT		 1878}
1879
1880/**
1881 * ata_scsi_rbuf_get - Map response buffer.
ec2a20e6 1882 * @cmd: SCSI command containing buffer to be mapped.
87340e98
TH		 1883 * @flags: unsigned long variable to store irq enable status
1884 * @copy_in: copy in from user buffer
1da177e4 1885 *
87340e98 1886 * Prepare buffer for simulated SCSI commands.
1da177e4
LT		 1887 *
1888 * LOCKING:
87340e98 1889 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1da177e4
LT		 1890 *
1891 * RETURNS:
87340e98 1892 * Pointer to response buffer.
1da177e4 1893 */
87340e98
TH		 1894static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1895 unsigned long *flags)
1da177e4 1896{
87340e98 1897 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1da177e4 1898
87340e98
TH		 1899 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1900 if (copy_in)
1901 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1902 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1903 return ata_scsi_rbuf;
1da177e4
LT		 1904}
1905
1906/**
1907 * ata_scsi_rbuf_put - Unmap response buffer.
1908 * @cmd: SCSI command containing buffer to be unmapped.
87340e98
TH		 1909 * @copy_out: copy out result
1910 * @flags: @flags passed to ata_scsi_rbuf_get()
1da177e4 1911 *
87340e98
TH		 1912 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1913 * @copy_back is true.
1da177e4
LT		 1914 *
1915 * LOCKING:
87340e98 1916 * Unlocks ata_scsi_rbuf_lock.
1da177e4 1917 */
87340e98
TH		 1918static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1919 unsigned long *flags)
1da177e4 1920{
87340e98
TH		 1921 if (copy_out)
1922 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1923 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1924 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1da177e4
LT		 1925}
1926
1927/**
1928 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1929 * @args: device IDENTIFY data / SCSI command of interest.
1930 * @actor: Callback hook for desired SCSI command simulator
1931 *
1932 * Takes care of the hard work of simulating a SCSI command...
1933 * Mapping the response buffer, calling the command's handler,
1934 * and handling the handler's return value. This return value
1935 * indicates whether the handler wishes the SCSI command to be
ae006510
DG		 1936 * completed successfully (0), or not (in which case cmd->result
1937 * and sense buffer are assumed to be set).
1da177e4
LT		 1938 *
1939 * LOCKING:
cca3974e 1940 * spin_lock_irqsave(host lock)
1da177e4 1941 */
f0761be3 1942static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
87340e98 1943 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1da177e4
LT		 1944{
1945 u8 *rbuf;
87340e98 1946 unsigned int rc;
1da177e4 1947 struct scsi_cmnd *cmd = args->cmd;
b445c568
JG		 1948 unsigned long flags;
1949
87340e98
TH		 1950 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1951 rc = actor(args, rbuf);
1952 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
b445c568 1953
ae006510 1954 if (rc == 0)
1da177e4 1955 cmd->result = SAM_STAT_GOOD;
ae006510 1956 args->done(cmd);
1da177e4
LT		 1957}
1958
1959/**
1960 * ata_scsiop_inq_std - Simulate INQUIRY command
1961 * @args: device IDENTIFY data / SCSI command of interest.
1962 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 1963 *
1964 * Returns standard device identification data associated
b142eb65 1965 * with non-VPD INQUIRY command output.
1da177e4
LT		 1966 *
1967 * LOCKING:
cca3974e 1968 * spin_lock_irqsave(host lock)
1da177e4 1969 */
87340e98 1970static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 1971{
87340e98
TH		 1972 const u8 versions[] = {
1973 0x60, /* SAM-3 (no version claimed) */
1974
1975 0x03,
1976 0x20, /* SBC-2 (no version claimed) */
1977
1978 0x02,
1979 0x60 /* SPC-3 (no version claimed) */
1980 };
1da177e4
LT		 1981 u8 hdr[] = {
1982 TYPE_DISK,
1983 0,
1984 0x5, /* claim SPC-3 version compatibility */
1985 2,
1986 95 - 4
1987 };
1988
87340e98
TH		 1989 VPRINTK("ENTER\n");
1990
1da177e4
LT		 1991 /* set scsi removeable (RMB) bit per ata bit */
1992 if (ata_id_removeable(args->id))
1993 hdr[1] |= (1 << 7);
1994
1da177e4 1995 memcpy(rbuf, hdr, sizeof(hdr));
87340e98
TH		 1996 memcpy(&rbuf[8], "ATA ", 8);
1997 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1998 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1da177e4 1999
87340e98
TH		 2000 if (rbuf[32] == 0 || rbuf[32] == ' ')
2001 memcpy(&rbuf[32], "n/a ", 4);
1da177e4 2002
87340e98 2003 memcpy(rbuf + 59, versions, sizeof(versions));
1da177e4
LT		 2004
2005 return 0;
2006}
2007
2008/**
b142eb65 2009 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1da177e4
LT		 2010 * @args: device IDENTIFY data / SCSI command of interest.
2011 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2012 *
b142eb65 2013 * Returns list of inquiry VPD pages available.
1da177e4
LT		 2014 *
2015 * LOCKING:
cca3974e 2016 * spin_lock_irqsave(host lock)
1da177e4 2017 */
87340e98 2018static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2019{
2020 const u8 pages[] = {
2021 0x00, /* page 0x00, this page */
2022 0x80, /* page 0x80, unit serial no page */
1e9dbc92
MW		 2023 0x83, /* page 0x83, device ident page */
2024 0x89, /* page 0x89, ata info page */
18f0f978 2025 0xb0, /* page 0xb0, block limits page */
1e9dbc92 2026 0xb1, /* page 0xb1, block device characteristics page */
02e0a604 2027 0xb2, /* page 0xb2, thin provisioning page */
1da177e4 2028 };
1da177e4 2029
87340e98
TH		 2030 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
2031 memcpy(rbuf + 4, pages, sizeof(pages));
1da177e4
LT		 2032 return 0;
2033}
2034
2035/**
b142eb65 2036 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1da177e4
LT		 2037 * @args: device IDENTIFY data / SCSI command of interest.
2038 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2039 *
2040 * Returns ATA device serial number.
2041 *
2042 * LOCKING:
cca3974e 2043 * spin_lock_irqsave(host lock)
1da177e4 2044 */
87340e98 2045static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2046{
2047 const u8 hdr[] = {
2048 0,
2049 0x80, /* this page code */
2050 0,
a0cf733b 2051 ATA_ID_SERNO_LEN, /* page len */
1da177e4 2052 };
1da177e4 2053
87340e98
TH		 2054 memcpy(rbuf, hdr, sizeof(hdr));
2055 ata_id_string(args->id, (unsigned char *) &rbuf[4],
2056 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1da177e4
LT		 2057 return 0;
2058}
2059
1da177e4 2060/**
b142eb65 2061 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1da177e4
LT		 2062 * @args: device IDENTIFY data / SCSI command of interest.
2063 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2064 *
b142eb65
JG		 2065 * Yields two logical unit device identification designators:
2066 * - vendor specific ASCII containing the ATA serial number
2067 * - SAT defined "t10 vendor id based" containing ASCII vendor
2068 * name ("ATA "), model and serial numbers.
1da177e4
LT		 2069 *
2070 * LOCKING:
cca3974e 2071 * spin_lock_irqsave(host lock)
1da177e4 2072 */
87340e98 2073static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2074{
b142eb65 2075 const int sat_model_serial_desc_len = 68;
87340e98 2076 int num;
1da177e4 2077
b142eb65
JG		 2078 rbuf[1] = 0x83; /* this page code */
2079 num = 4;
2080
87340e98
TH		 2081 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2082 rbuf[num + 0] = 2;
2083 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2084 num += 4;
2085 ata_id_string(args->id, (unsigned char *) rbuf + num,
2086 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2087 num += ATA_ID_SERNO_LEN;
2088
2089 /* SAT defined lu model and serial numbers descriptor */
2090 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2091 rbuf[num + 0] = 2;
2092 rbuf[num + 1] = 1;
2093 rbuf[num + 3] = sat_model_serial_desc_len;
2094 num += 4;
2095 memcpy(rbuf + num, "ATA ", 8);
2096 num += 8;
2097 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2098 ATA_ID_PROD_LEN);
2099 num += ATA_ID_PROD_LEN;
2100 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2101 ATA_ID_SERNO_LEN);
2102 num += ATA_ID_SERNO_LEN;
2103
6b3b9d73
HR		 2104 if (ata_id_has_wwn(args->id)) {
2105 /* SAT defined lu world wide name */
2106 /* piv=0, assoc=lu, code_set=binary, designator=NAA */
2107 rbuf[num + 0] = 1;
2108 rbuf[num + 1] = 3;
2109 rbuf[num + 3] = ATA_ID_WWN_LEN;
2110 num += 4;
2111 ata_id_string(args->id, (unsigned char *) rbuf + num,
2112 ATA_ID_WWN, ATA_ID_WWN_LEN);
2113 num += ATA_ID_WWN_LEN;
2114 }
b142eb65 2115 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
1da177e4
LT		 2116 return 0;
2117}
2118
ad355b46
JG		 2119/**
2120 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2121 * @args: device IDENTIFY data / SCSI command of interest.
2122 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
ad355b46
JG		 2123 *
2124 * Yields SAT-specified ATA VPD page.
2125 *
2126 * LOCKING:
2127 * spin_lock_irqsave(host lock)
2128 */
87340e98 2129static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
ad355b46 2130{
ad355b46 2131 struct ata_taskfile tf;
ad355b46 2132
ad355b46
JG		 2133 memset(&tf, 0, sizeof(tf));
2134
87340e98
TH		 2135 rbuf[1] = 0x89; /* our page code */
2136 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2137 rbuf[3] = (0x238 & 0xff);
ad355b46 2138
87340e98
TH		 2139 memcpy(&rbuf[8], "linux ", 8);
2140 memcpy(&rbuf[16], "libata ", 16);
2141 memcpy(&rbuf[32], DRV_VERSION, 4);
ad355b46
JG		 2142
2143 /* we don't store the ATA device signature, so we fake it */
2144
2145 tf.command = ATA_DRDY; /* really, this is Status reg */
2146 tf.lbal = 0x1;
2147 tf.nsect = 0x1;
2148
87340e98
TH		 2149 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2150 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
ad355b46 2151
87340e98 2152 rbuf[56] = ATA_CMD_ID_ATA;
ad355b46 2153
87340e98 2154 memcpy(&rbuf[60], &args->id[0], 512);
ad355b46
JG		 2155 return 0;
2156}
2157
18f0f978
CH		 2158static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
2159{
295124dc 2160 u16 min_io_sectors;
18f0f978
CH		 2161
2162 rbuf[1] = 0xb0;
2163 rbuf[3] = 0x3c; /* required VPD size with unmap support */
2164
2165 /*
2166 * Optimal transfer length granularity.
2167 *
2168 * This is always one physical block, but for disks with a smaller
2169 * logical than physical sector size we need to figure out what the
2170 * latter is.
2171 */
295124dc 2172 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
18f0f978
CH		 2173 put_unaligned_be16(min_io_sectors, &rbuf[6]);
2174
2175 /*
2176 * Optimal unmap granularity.
2177 *
2178 * The ATA spec doesn't even know about a granularity or alignment
2179 * for the TRIM command. We can leave away most of the unmap related
2180 * VPD page entries, but we have specifify a granularity to signal
2181 * that we support some form of unmap - in thise case via WRITE SAME
2182 * with the unmap bit set.
2183 */
e78db4df 2184 if (ata_id_has_trim(args->id)) {
5f4e2066 2185 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
18f0f978 2186 put_unaligned_be32(1, &rbuf[28]);
e78db4df 2187 }
18f0f978
CH		 2188
2189 return 0;
2190}
2191
1e9dbc92
MW		 2192static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2193{
4bca3286
MP		 2194 int form_factor = ata_id_form_factor(args->id);
2195 int media_rotation_rate = ata_id_rotation_rate(args->id);
2196
1e9dbc92
MW		 2197 rbuf[1] = 0xb1;
2198 rbuf[3] = 0x3c;
4bca3286
MP		 2199 rbuf[4] = media_rotation_rate >> 8;
2200 rbuf[5] = media_rotation_rate;
2201 rbuf[7] = form_factor;
1e9dbc92
MW		 2202
2203 return 0;
2204}
2205
02e0a604
MP		 2206static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
2207{
2208 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2209 rbuf[1] = 0xb2;
2210 rbuf[3] = 0x4;
2211 rbuf[5] = 1 << 6; /* TPWS */
2212
2213 return 0;
2214}
2215
1da177e4 2216/**
0cba632b 2217 * ata_scsiop_noop - Command handler that simply returns success.
1da177e4
LT		 2218 * @args: device IDENTIFY data / SCSI command of interest.
2219 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2220 *
2221 * No operation. Simply returns success to caller, to indicate
2222 * that the caller should successfully complete this SCSI command.
2223 *
2224 * LOCKING:
cca3974e 2225 * spin_lock_irqsave(host lock)
1da177e4 2226 */
87340e98 2227static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2228{
2229 VPRINTK("ENTER\n");
2230 return 0;
2231}
2232
6ca8e794
PB		 2233/**
2234 * modecpy - Prepare response for MODE SENSE
2235 * @dest: output buffer
2236 * @src: data being copied
2237 * @n: length of mode page
2238 * @changeable: whether changeable parameters are requested
2239 *
2240 * Generate a generic MODE SENSE page for either current or changeable
2241 * parameters.
2242 *
2243 * LOCKING:
2244 * None.
2245 */
2246static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
2247{
2248 if (changeable) {
2249 memcpy(dest, src, 2);
2250 memset(dest + 2, 0, n - 2);
2251 } else {
2252 memcpy(dest, src, n);
2253 }
2254}
2255
1da177e4
LT		 2256/**
2257 * ata_msense_caching - Simulate MODE SENSE caching info page
2258 * @id: device IDENTIFY data
87340e98 2259 * @buf: output buffer
6ca8e794 2260 * @changeable: whether changeable parameters are requested
1da177e4
LT		 2261 *
2262 * Generate a caching info page, which conditionally indicates
2263 * write caching to the SCSI layer, depending on device
2264 * capabilities.
2265 *
2266 * LOCKING:
2267 * None.
2268 */
6ca8e794 2269static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
1da177e4 2270{
6ca8e794 2271 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
1b26d29c 2272 if (changeable || ata_id_wcache_enabled(id))
87340e98 2273 buf[2] |= (1 << 2); /* write cache enable */
6ca8e794 2274 if (!changeable && !ata_id_rahead_enabled(id))
87340e98
TH		 2275 buf[12] |= (1 << 5); /* disable read ahead */
2276 return sizeof(def_cache_mpage);
1da177e4
LT		 2277}
2278
2279/**
2280 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
87340e98 2281 * @buf: output buffer
6ca8e794 2282 * @changeable: whether changeable parameters are requested
1da177e4
LT		 2283 *
2284 * Generate a generic MODE SENSE control mode page.
2285 *
2286 * LOCKING:
2287 * None.
2288 */
6ca8e794 2289static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable)
1da177e4 2290{
6ca8e794 2291 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable);
00ac37f5 2292 return sizeof(def_control_mpage);
1da177e4
LT		 2293}
2294
2295/**
2296 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
ec2a20e6 2297 * @buf: output buffer
6ca8e794 2298 * @changeable: whether changeable parameters are requested
1da177e4
LT		 2299 *
2300 * Generate a generic MODE SENSE r/w error recovery page.
2301 *
2302 * LOCKING:
2303 * None.
2304 */
6ca8e794 2305static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable)
1da177e4 2306{
6ca8e794
PB		 2307 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage),
2308 changeable);
00ac37f5 2309 return sizeof(def_rw_recovery_mpage);
1da177e4
LT		 2310}
2311
48bdc8ec
JA		 2312/*
2313 * We can turn this into a real blacklist if it's needed, for now just
2314 * blacklist any Maxtor BANC1G10 revision firmware
2315 */
2316static int ata_dev_supports_fua(u16 *id)
2317{
a0cf733b 2318 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
48bdc8ec 2319
c3c013a2
JG		 2320 if (!libata_fua)
2321 return 0;
48bdc8ec
JA		 2322 if (!ata_id_has_fua(id))
2323 return 0;
2324
a0cf733b
TH		 2325 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2326 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
48bdc8ec 2327
2e02671d 2328 if (strcmp(model, "Maxtor"))
48bdc8ec 2329 return 1;
2e02671d 2330 if (strcmp(fw, "BANC1G10"))
48bdc8ec
JA		 2331 return 1;
2332
2333 return 0; /* blacklisted */
2334}
2335
1da177e4
LT		 2336/**
2337 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2338 * @args: device IDENTIFY data / SCSI command of interest.
2339 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4 2340 *
00ac37f5
DG		 2341 * Simulate MODE SENSE commands. Assume this is invoked for direct
2342 * access devices (e.g. disks) only. There should be no block
2343 * descriptor for other device types.
1da177e4
LT		 2344 *
2345 * LOCKING:
cca3974e 2346 * spin_lock_irqsave(host lock)
1da177e4 2347 */
87340e98 2348static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2349{
9a3dccc4 2350 struct ata_device *dev = args->dev;
87340e98 2351 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
00ac37f5
DG		 2352 const u8 sat_blk_desc[] = {
2353 0, 0, 0, 0, /* number of blocks: sat unspecified */
2354 0,
2355 0, 0x2, 0x0 /* block length: 512 bytes */
2356 };
2357 u8 pg, spg;
87340e98 2358 unsigned int ebd, page_control, six_byte;
9a3dccc4 2359 u8 dpofua;
1da177e4
LT		 2360
2361 VPRINTK("ENTER\n");
2362
2363 six_byte = (scsicmd[0] == MODE_SENSE);
00ac37f5
DG		 2364 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2365 /*
2366 * LLBA bit in msense(10) ignored (compliant)
1da177e4 2367 */
00ac37f5 2368
1da177e4 2369 page_control = scsicmd[2] >> 6;
ae006510
DG		 2370 switch (page_control) {
2371 case 0: /* current */
6ca8e794
PB		 2372 case 1: /* changeable */
2373 case 2: /* defaults */
ae006510
DG		 2374 break; /* supported */
2375 case 3: /* saved */
2376 goto saving_not_supp;
ae006510
DG		 2377 default:
2378 goto invalid_fld;
2379 }
1da177e4 2380
87340e98
TH		 2381 if (six_byte)
2382 p += 4 + (ebd ? 8 : 0);
2383 else
2384 p += 8 + (ebd ? 8 : 0);
1da177e4 2385
00ac37f5
DG		 2386 pg = scsicmd[2] & 0x3f;
2387 spg = scsicmd[3];
2388 /*
2389 * No mode subpages supported (yet) but asking for _all_
2390 * subpages may be valid
2391 */
2392 if (spg && (spg != ALL_SUB_MPAGES))
2393 goto invalid_fld;
2394
2395 switch(pg) {
2396 case RW_RECOVERY_MPAGE:
6ca8e794 2397 p += ata_msense_rw_recovery(p, page_control == 1);
1da177e4
LT		 2398 break;
2399
00ac37f5 2400 case CACHE_MPAGE:
6ca8e794 2401 p += ata_msense_caching(args->id, p, page_control == 1);
1da177e4
LT		 2402 break;
2403
87340e98 2404 case CONTROL_MPAGE:
6ca8e794 2405 p += ata_msense_ctl_mode(p, page_control == 1);
1da177e4 2406 break;
1da177e4 2407
00ac37f5 2408 case ALL_MPAGES:
6ca8e794
PB		 2409 p += ata_msense_rw_recovery(p, page_control == 1);
2410 p += ata_msense_caching(args->id, p, page_control == 1);
2411 p += ata_msense_ctl_mode(p, page_control == 1);
1da177e4
LT		 2412 break;
2413
2414 default: /* invalid page code */
ae006510 2415 goto invalid_fld;
1da177e4
LT		 2416 }
2417
9a3dccc4 2418 dpofua = 0;
f79d409f 2419 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
9a3dccc4
TH		 2420 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2421 dpofua = 1 << 4;
2422
1da177e4 2423 if (six_byte) {
87340e98
TH		 2424 rbuf[0] = p - rbuf - 1;
2425 rbuf[2] |= dpofua;
00ac37f5 2426 if (ebd) {
87340e98
TH		 2427 rbuf[3] = sizeof(sat_blk_desc);
2428 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
00ac37f5 2429 }
1da177e4 2430 } else {
87340e98
TH		 2431 unsigned int output_len = p - rbuf - 2;
2432
1da177e4 2433 rbuf[0] = output_len >> 8;
87340e98
TH		 2434 rbuf[1] = output_len;
2435 rbuf[3] |= dpofua;
00ac37f5 2436 if (ebd) {
87340e98
TH		 2437 rbuf[7] = sizeof(sat_blk_desc);
2438 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
00ac37f5 2439 }
1da177e4 2440 }
1da177e4 2441 return 0;
ae006510
DG		 2442
2443invalid_fld:
2444 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2445 /* "Invalid field in cbd" */
2446 return 1;
2447
2448saving_not_supp:
2449 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2450 /* "Saving parameters not supported" */
2451 return 1;
1da177e4
LT		 2452}
2453
2454/**
2455 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2456 * @args: device IDENTIFY data / SCSI command of interest.
2457 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2458 *
2459 * Simulate READ CAPACITY commands.
2460 *
2461 * LOCKING:
6a36261e 2462 * None.
1da177e4 2463 */
87340e98 2464static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
1da177e4 2465{
61d79a8e
MP		 2466 struct ata_device *dev = args->dev;
2467 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
295124dc
GG		 2468 u32 sector_size; /* physical sector size in bytes */
2469 u8 log2_per_phys;
2470 u16 lowest_aligned;
2471
2472 sector_size = ata_id_logical_sector_size(dev->id);
2473 log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2474 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
1da177e4
LT		 2475
2476 VPRINTK("ENTER\n");
2477
1da177e4 2478 if (args->cmd->cmnd[0] == READ_CAPACITY) {
6a36261e
TH		 2479 if (last_lba >= 0xffffffffULL)
2480 last_lba = 0xffffffff;
0c144d0d 2481
1da177e4 2482 /* sector count, 32-bit */
87340e98
TH		 2483 rbuf[0] = last_lba >> (8 * 3);
2484 rbuf[1] = last_lba >> (8 * 2);
2485 rbuf[2] = last_lba >> (8 * 1);
2486 rbuf[3] = last_lba;
1da177e4
LT		 2487
2488 /* sector size */
295124dc
GG		 2489 rbuf[4] = sector_size >> (8 * 3);
2490 rbuf[5] = sector_size >> (8 * 2);
2491 rbuf[6] = sector_size >> (8 * 1);
2492 rbuf[7] = sector_size;
1da177e4
LT		 2493 } else {
2494 /* sector count, 64-bit */
87340e98
TH		 2495 rbuf[0] = last_lba >> (8 * 7);
2496 rbuf[1] = last_lba >> (8 * 6);
2497 rbuf[2] = last_lba >> (8 * 5);
2498 rbuf[3] = last_lba >> (8 * 4);
2499 rbuf[4] = last_lba >> (8 * 3);
2500 rbuf[5] = last_lba >> (8 * 2);
2501 rbuf[6] = last_lba >> (8 * 1);
2502 rbuf[7] = last_lba;
1da177e4
LT		 2503
2504 /* sector size */
295124dc
GG		 2505 rbuf[ 8] = sector_size >> (8 * 3);
2506 rbuf[ 9] = sector_size >> (8 * 2);
2507 rbuf[10] = sector_size >> (8 * 1);
2508 rbuf[11] = sector_size;
61d79a8e
MP		 2509
2510 rbuf[12] = 0;
295124dc 2511 rbuf[13] = log2_per_phys;
61d79a8e
MP		 2512 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2513 rbuf[15] = lowest_aligned;
18f0f978 2514
143482d1
AF		 2515 if (ata_id_has_trim(args->id) &&
2516 !(dev->horkage & ATA_HORKAGE_NOTRIM)) {
e78db4df
MP		 2517 rbuf[14] |= 0x80; /* TPE */
2518
2519 if (ata_id_has_zero_after_trim(args->id))
2520 rbuf[14] |= 0x40; /* TPRZ */
2521 }
1da177e4
LT		 2522 }
2523
2524 return 0;
2525}
2526
2527/**
2528 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2529 * @args: device IDENTIFY data / SCSI command of interest.
2530 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1da177e4
LT		 2531 *
2532 * Simulate REPORT LUNS command.
2533 *
2534 * LOCKING:
cca3974e 2535 * spin_lock_irqsave(host lock)
1da177e4 2536 */
87340e98 2537static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
1da177e4
LT		 2538{
2539 VPRINTK("ENTER\n");
2540 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2541
2542 return 0;
2543}
2544
77853bf2 2545static void atapi_sense_complete(struct ata_queued_cmd *qc)
a939c963 2546{
74e6c8c3 2547 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
c6e6e666
JG		 2548 /* FIXME: not quite right; we don't want the
2549 * translation of taskfile registers into
2550 * a sense descriptors, since that's only
2551 * correct for ATA, not ATAPI
2552 */
750426aa 2553 ata_gen_passthru_sense(qc);
74e6c8c3 2554 }
a939c963 2555
c6e6e666 2556 qc->scsidone(qc->scsicmd);
77853bf2 2557 ata_qc_free(qc);
c6e6e666 2558}
a939c963 2559
c6e6e666
JG		 2560/* is it pointless to prefer PIO for "safety reasons"? */
2561static inline int ata_pio_use_silly(struct ata_port *ap)
2562{
2563 return (ap->flags & ATA_FLAG_PIO_DMA);
2564}
2565
2566static void atapi_request_sense(struct ata_queued_cmd *qc)
2567{
2568 struct ata_port *ap = qc->ap;
2569 struct scsi_cmnd *cmd = qc->scsicmd;
2570
2571 DPRINTK("ATAPI request sense\n");
a939c963
JG		 2572
2573 /* FIXME: is this needed? */
7ccd720d 2574 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
a939c963 2575
127102ae 2576#ifdef CONFIG_ATA_SFF
855d854a
JB		 2577 if (ap->ops->sff_tf_read)
2578 ap->ops->sff_tf_read(ap, &qc->tf);
127102ae 2579#endif
c6e6e666
JG		 2580
2581 /* fill these in, for the case where they are -not- overwritten */
2582 cmd->sense_buffer[0] = 0x70;
2583 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2584
2585 ata_qc_reinit(qc);
2586
93f8fecb 2587 /* setup sg table and init transfer direction */
cadb7345 2588 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
93f8fecb 2589 ata_sg_init(qc, &qc->sgent, 1);
a939c963
JG		 2590 qc->dma_dir = DMA_FROM_DEVICE;
2591
6e7846e9 2592 memset(&qc->cdb, 0, qc->dev->cdb_len);
a939c963
JG		 2593 qc->cdb[0] = REQUEST_SENSE;
2594 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2595
2596 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2597 qc->tf.command = ATA_CMD_PACKET;
2598
c6e6e666 2599 if (ata_pio_use_silly(ap)) {
0dc36888 2600 qc->tf.protocol = ATAPI_PROT_DMA;
c6e6e666
JG		 2601 qc->tf.feature |= ATAPI_PKT_DMA;
2602 } else {
0dc36888 2603 qc->tf.protocol = ATAPI_PROT_PIO;
2db78dd3
AC		 2604 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2605 qc->tf.lbah = 0;
c6e6e666 2606 }
a939c963
JG		 2607 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2608
c6e6e666 2609 qc->complete_fn = atapi_sense_complete;
a939c963 2610
8e0e694a 2611 ata_qc_issue(qc);
a939c963
JG		 2612
2613 DPRINTK("EXIT\n");
2614}
2615
77853bf2 2616static void atapi_qc_complete(struct ata_queued_cmd *qc)
1da177e4
LT		 2617{
2618 struct scsi_cmnd *cmd = qc->scsicmd;
a22e2eb0 2619 unsigned int err_mask = qc->err_mask;
1da177e4 2620
a7dac447 2621 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
e12669e7 2622
246619da
TH		 2623 /* handle completion from new EH */
2624 if (unlikely(qc->ap->ops->error_handler &&
2625 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2626
2627 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2628 /* FIXME: not quite right; we don't want the
2629 * translation of taskfile registers into a
2630 * sense descriptors, since that's only
2631 * correct for ATA, not ATAPI
2632 */
750426aa 2633 ata_gen_passthru_sense(qc);
246619da
TH		 2634 }
2635
22aac089
TH		 2636 /* SCSI EH automatically locks door if sdev->locked is
2637 * set. Sometimes door lock request continues to
2638 * fail, for example, when no media is present. This
2639 * creates a loop - SCSI EH issues door lock which
2640 * fails and gets invoked again to acquire sense data
2641 * for the failed command.
2642 *
2643 * If door lock fails, always clear sdev->locked to
2644 * avoid this infinite loop.
2a5f07b5
TH		 2645 *
2646 * This may happen before SCSI scan is complete. Make
2647 * sure qc->dev->sdev isn't NULL before dereferencing.
22aac089 2648 */
2a5f07b5 2649 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
22aac089
TH		 2650 qc->dev->sdev->locked = 0;
2651
246619da
TH		 2652 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2653 qc->scsidone(cmd);
2654 ata_qc_free(qc);
2655 return;
2656 }
2657
2658 /* successful completion or old EH failure path */
a7dac447 2659 if (unlikely(err_mask & AC_ERR_DEV)) {
1da177e4 2660 cmd->result = SAM_STAT_CHECK_CONDITION;
c6e6e666 2661 atapi_request_sense(qc);
77853bf2 2662 return;
74e6c8c3 2663 } else if (unlikely(err_mask)) {
a7dac447
JG		 2664 /* FIXME: not quite right; we don't want the
2665 * translation of taskfile registers into
2666 * a sense descriptors, since that's only
2667 * correct for ATA, not ATAPI
2668 */
750426aa 2669 ata_gen_passthru_sense(qc);
74e6c8c3 2670 } else {
1da177e4
LT		 2671 u8 *scsicmd = cmd->cmnd;
2672
fd71da46 2673 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
b445c568 2674 unsigned long flags;
87340e98 2675 u8 *buf;
b445c568 2676
87340e98 2677 buf = ata_scsi_rbuf_get(cmd, true, &flags);
a15dbeb4
JG		 2678
2679 /* ATAPI devices typically report zero for their SCSI version,
2680 * and sometimes deviate from the spec WRT response data
2681 * format. If SCSI version is reported as zero like normal,
2682 * then we make the following fixups: 1) Fake MMC-5 version,
2683 * to indicate to the Linux scsi midlayer this is a modern
2684 * device. 2) Ensure response data format / ATAPI information
2685 * are always correct.
a15dbeb4
JG		 2686 */
2687 if (buf[2] == 0) {
2688 buf[2] = 0x5;
2689 buf[3] = 0x32;
2690 }
2691
87340e98 2692 ata_scsi_rbuf_put(cmd, true, &flags);
1da177e4 2693 }
a15dbeb4 2694
1da177e4
LT		 2695 cmd->result = SAM_STAT_GOOD;
2696 }
2697
2698 qc->scsidone(cmd);
77853bf2 2699 ata_qc_free(qc);
1da177e4
LT		 2700}
2701/**
2702 * atapi_xlat - Initialize PACKET taskfile
2703 * @qc: command structure to be initialized
1da177e4
LT		 2704 *
2705 * LOCKING:
cca3974e 2706 * spin_lock_irqsave(host lock)
1da177e4
LT		 2707 *
2708 * RETURNS:
2709 * Zero on success, non-zero on failure.
2710 */
ad706991 2711static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
1da177e4 2712{
542b1444 2713 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4 2714 struct ata_device *dev = qc->dev;
542b1444 2715 int nodata = (scmd->sc_data_direction == DMA_NONE);
5895ef9a 2716 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2db78dd3 2717 unsigned int nbytes;
1da177e4 2718
2e5704f6
TH		 2719 memset(qc->cdb, 0, dev->cdb_len);
2720 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
1da177e4
LT		 2721
2722 qc->complete_fn = atapi_qc_complete;
2723
2724 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
542b1444 2725 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1da177e4
LT		 2726 qc->tf.flags |= ATA_TFLAG_WRITE;
2727 DPRINTK("direction: write\n");
2728 }
2729
2730 qc->tf.command = ATA_CMD_PACKET;
aacda375 2731 ata_qc_set_pc_nbytes(qc);
e00f1ff3
TH		 2732
2733 /* check whether ATAPI DMA is safe */
5895ef9a 2734 if (!nodata && !using_pio && atapi_check_dma(qc))
e00f1ff3 2735 using_pio = 1;
1da177e4 2736
e190222d
TH		 2737 /* Some controller variants snoop this value for Packet
2738 * transfers to do state machine and FIFO management. Thus we
2739 * want to set it properly, and for DMA where it is
2740 * effectively meaningless.
2741 */
aacda375 2742 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2db78dd3 2743
e190222d
TH		 2744 /* Most ATAPI devices which honor transfer chunk size don't
2745 * behave according to the spec when odd chunk size which
2746 * matches the transfer length is specified. If the number of
2747 * bytes to transfer is 2n+1. According to the spec, what
2748 * should happen is to indicate that 2n+1 is going to be
2749 * transferred and transfer 2n+2 bytes where the last byte is
2750 * padding.
2751 *
2752 * In practice, this doesn't happen. ATAPI devices first
2753 * indicate and transfer 2n bytes and then indicate and
2754 * transfer 2 bytes where the last byte is padding.
2755 *
2756 * This inconsistency confuses several controllers which
2757 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2758 * These controllers use actual number of transferred bytes to
2759 * update DMA poitner and transfer of 4n+2 bytes make those
2760 * controller push DMA pointer by 4n+4 bytes because SATA data
2761 * FISes are aligned to 4 bytes. This causes data corruption
2762 * and buffer overrun.
2763 *
2764 * Always setting nbytes to even number solves this problem
2765 * because then ATAPI devices don't have to split data at 2n
2766 * boundaries.
2767 */
2768 if (nbytes & 0x1)
2769 nbytes++;
2770
2db78dd3
AC		 2771 qc->tf.lbam = (nbytes & 0xFF);
2772 qc->tf.lbah = (nbytes >> 8);
2773
5895ef9a
TH		 2774 if (nodata)
2775 qc->tf.protocol = ATAPI_PROT_NODATA;
2776 else if (using_pio)
2777 qc->tf.protocol = ATAPI_PROT_PIO;
2778 else {
e00f1ff3 2779 /* DMA data xfer */
0dc36888 2780 qc->tf.protocol = ATAPI_PROT_DMA;
1da177e4
LT		 2781 qc->tf.feature |= ATAPI_PKT_DMA;
2782
91163006
TH		 2783 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2784 (scmd->sc_data_direction != DMA_TO_DEVICE))
95de719a 2785 /* some SATA bridges need us to indicate data xfer direction */
1da177e4 2786 qc->tf.feature |= ATAPI_DMADIR;
1da177e4
LT		 2787 }
2788
2db78dd3
AC		 2789
2790 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2791 as ATAPI tape drives don't get this right otherwise */
1da177e4
LT		 2792 return 0;
2793}
2794
2dcb407e 2795static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
ab5b3a5b 2796{
071f44b1 2797 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 2798 if (likely(devno < ata_link_max_devices(&ap->link)))
2799 return &ap->link.device[devno];
2800 } else {
2801 if (likely(devno < ap->nr_pmp_links))
2802 return &ap->pmp_link[devno].device[0];
2803 }
2804
ab5b3a5b
TH		 2805 return NULL;
2806}
2807
2dcb407e
JG		 2808static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2809 const struct scsi_device *scsidev)
ab5b3a5b 2810{
41bda9c9
TH		 2811 int devno;
2812
ab5b3a5b 2813 /* skip commands not addressed to targets we simulate */
071f44b1 2814 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 2815 if (unlikely(scsidev->channel || scsidev->lun))
2816 return NULL;
2817 devno = scsidev->id;
2818 } else {
2819 if (unlikely(scsidev->id || scsidev->lun))
2820 return NULL;
2821 devno = scsidev->channel;
2822 }
ab5b3a5b 2823
41bda9c9 2824 return ata_find_dev(ap, devno);
ab5b3a5b
TH		 2825}
2826
1da177e4
LT		 2827/**
2828 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2829 * @ap: ATA port to which the device is attached
2830 * @scsidev: SCSI device from which we derive the ATA device
2831 *
2832 * Given various information provided in struct scsi_cmnd,
2833 * map that onto an ATA bus, and using that mapping
2834 * determine which ata_device is associated with the
2835 * SCSI command to be sent.
2836 *
2837 * LOCKING:
cca3974e 2838 * spin_lock_irqsave(host lock)
1da177e4
LT		 2839 *
2840 * RETURNS:
2841 * Associated ATA device, or %NULL if not found.
2842 */
1da177e4 2843static struct ata_device *
057ace5e 2844ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
1da177e4 2845{
ab5b3a5b 2846 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
1da177e4 2847
2486fa56 2848 if (unlikely(!dev || !ata_dev_enabled(dev)))
1da177e4
LT		 2849 return NULL;
2850
1da177e4
LT		 2851 return dev;
2852}
2853
b095518e
JG		 2854/*
2855 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2856 * @byte1: Byte 1 from pass-thru CDB.
2857 *
2858 * RETURNS:
2859 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2860 */
2861static u8
2862ata_scsi_map_proto(u8 byte1)
2863{
2864 switch((byte1 & 0x1e) >> 1) {
2dcb407e
JG		 2865 case 3: /* Non-data */
2866 return ATA_PROT_NODATA;
2867
2868 case 6: /* DMA */
2869 case 10: /* UDMA Data-in */
2870 case 11: /* UDMA Data-Out */
2871 return ATA_PROT_DMA;
2872
2873 case 4: /* PIO Data-in */
2874 case 5: /* PIO Data-out */
2875 return ATA_PROT_PIO;
2876
2877 case 0: /* Hard Reset */
2878 case 1: /* SRST */
2879 case 8: /* Device Diagnostic */
2880 case 9: /* Device Reset */
2881 case 7: /* DMA Queued */
2882 case 12: /* FPDMA */
2883 case 15: /* Return Response Info */
2884 default: /* Reserved */
2885 break;
b095518e
JG		 2886 }
2887
2888 return ATA_PROT_UNKNOWN;
2889}
2890
2891/**
2892 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2893 * @qc: command structure to be initialized
b095518e
JG		 2894 *
2895 * Handles either 12 or 16-byte versions of the CDB.
2896 *
2897 * RETURNS:
2898 * Zero on success, non-zero on failure.
2899 */
ad706991 2900static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
b095518e
JG		 2901{
2902 struct ata_taskfile *tf = &(qc->tf);
542b1444 2903 struct scsi_cmnd *scmd = qc->scsicmd;
f79d409f 2904 struct ata_device *dev = qc->dev;
ad706991 2905 const u8 *cdb = scmd->cmnd;
b095518e 2906
542b1444 2907 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
9a405257 2908 goto invalid_fld;
8190bdb9 2909
b095518e
JG		 2910 /*
2911 * 12 and 16 byte CDBs use different offsets to
2912 * provide the various register values.
2913 */
542b1444 2914 if (cdb[0] == ATA_16) {
b095518e
JG		 2915 /*
2916 * 16-byte CDB - may contain extended commands.
2917 *
2918 * If that is the case, copy the upper byte register values.
2919 */
542b1444
TH		 2920 if (cdb[1] & 0x01) {
2921 tf->hob_feature = cdb[3];
2922 tf->hob_nsect = cdb[5];
2923 tf->hob_lbal = cdb[7];
2924 tf->hob_lbam = cdb[9];
2925 tf->hob_lbah = cdb[11];
b095518e
JG		 2926 tf->flags |= ATA_TFLAG_LBA48;
2927 } else
2928 tf->flags &= ~ATA_TFLAG_LBA48;
2929
2930 /*
2931 * Always copy low byte, device and command registers.
2932 */
542b1444
TH		 2933 tf->feature = cdb[4];
2934 tf->nsect = cdb[6];
2935 tf->lbal = cdb[8];
2936 tf->lbam = cdb[10];
2937 tf->lbah = cdb[12];
2938 tf->device = cdb[13];
2939 tf->command = cdb[14];
b095518e
JG		 2940 } else {
2941 /*
2942 * 12-byte CDB - incapable of extended commands.
2943 */
2944 tf->flags &= ~ATA_TFLAG_LBA48;
2945
542b1444
TH		 2946 tf->feature = cdb[3];
2947 tf->nsect = cdb[4];
2948 tf->lbal = cdb[5];
2949 tf->lbam = cdb[6];
2950 tf->lbah = cdb[7];
2951 tf->device = cdb[8];
2952 tf->command = cdb[9];
b095518e 2953 }
fa4453c4
AL		 2954
2955 /* enforce correct master/slave bit */
2956 tf->device = dev->devno ?
2957 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
b095518e 2958
bd30add8 2959 switch (tf->command) {
295124dc 2960 /* READ/WRITE LONG use a non-standard sect_size */
bd30add8
TH		 2961 case ATA_CMD_READ_LONG:
2962 case ATA_CMD_READ_LONG_ONCE:
2963 case ATA_CMD_WRITE_LONG:
2964 case ATA_CMD_WRITE_LONG_ONCE:
2965 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2966 goto invalid_fld;
2967 qc->sect_size = scsi_bufflen(scmd);
295124dc
GG		 2968 break;
2969
2970 /* commands using reported Logical Block size (e.g. 512 or 4K) */
2971 case ATA_CMD_CFA_WRITE_NE:
2972 case ATA_CMD_CFA_TRANS_SECT:
2973 case ATA_CMD_CFA_WRITE_MULT_NE:
2974 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
2975 case ATA_CMD_READ:
2976 case ATA_CMD_READ_EXT:
2977 case ATA_CMD_READ_QUEUED:
2978 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
2979 case ATA_CMD_FPDMA_READ:
2980 case ATA_CMD_READ_MULTI:
2981 case ATA_CMD_READ_MULTI_EXT:
2982 case ATA_CMD_PIO_READ:
2983 case ATA_CMD_PIO_READ_EXT:
2984 case ATA_CMD_READ_STREAM_DMA_EXT:
2985 case ATA_CMD_READ_STREAM_EXT:
2986 case ATA_CMD_VERIFY:
2987 case ATA_CMD_VERIFY_EXT:
2988 case ATA_CMD_WRITE:
2989 case ATA_CMD_WRITE_EXT:
2990 case ATA_CMD_WRITE_FUA_EXT:
2991 case ATA_CMD_WRITE_QUEUED:
2992 case ATA_CMD_WRITE_QUEUED_FUA_EXT:
2993 case ATA_CMD_FPDMA_WRITE:
2994 case ATA_CMD_WRITE_MULTI:
2995 case ATA_CMD_WRITE_MULTI_EXT:
2996 case ATA_CMD_WRITE_MULTI_FUA_EXT:
2997 case ATA_CMD_PIO_WRITE:
2998 case ATA_CMD_PIO_WRITE_EXT:
2999 case ATA_CMD_WRITE_STREAM_DMA_EXT:
3000 case ATA_CMD_WRITE_STREAM_EXT:
3001 qc->sect_size = scmd->device->sector_size;
3002 break;
3003
3004 /* Everything else uses 512 byte "sectors" */
3005 default:
3006 qc->sect_size = ATA_SECT_SIZE;
bd30add8
TH		 3007 }
3008
3009 /*
3010 * Set flags so that all registers will be written, pass on
3011 * write indication (used for PIO/DMA setup), result TF is
3012 * copied back and we don't whine too much about its failure.
3013 */
bc496ed0 3014 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
bd30add8
TH		 3015 if (scmd->sc_data_direction == DMA_TO_DEVICE)
3016 tf->flags |= ATA_TFLAG_WRITE;
3017
3018 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
3019
3020 /*
3021 * Set transfer length.
3022 *
3023 * TODO: find out if we need to do more here to
3024 * cover scatter/gather case.
3025 */
3026 ata_qc_set_pc_nbytes(qc);
3027
3028 /* We may not issue DMA commands if no DMA mode is set */
3029 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
3030 goto invalid_fld;
3031
1dce589c
AL		 3032 /* sanity check for pio multi commands */
3033 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
3034 goto invalid_fld;
3035
3036 if (is_multi_taskfile(tf)) {
3037 unsigned int multi_count = 1 << (cdb[1] >> 5);
3038
3039 /* compare the passed through multi_count
3040 * with the cached multi_count of libata
3041 */
3042 if (multi_count != dev->multi_count)
a9a79dfe
JP		 3043 ata_dev_warn(dev, "invalid multi_count %u ignored\n",
3044 multi_count);
d26fc955 3045 }
1dce589c 3046
b095518e
JG		 3047 /*
3048 * Filter SET_FEATURES - XFER MODE command -- otherwise,
3049 * SET_FEATURES - XFER MODE must be preceded/succeeded
3050 * by an update to hardware-specific registers for each
3051 * controller (i.e. the reason for ->set_piomode(),
3052 * ->set_dmamode(), and ->post_set_mode() hooks).
3053 */
bd30add8
TH		 3054 if (tf->command == ATA_CMD_SET_FEATURES &&
3055 tf->feature == SETFEATURES_XFER)
9a405257 3056 goto invalid_fld;
b095518e
JG		 3057
3058 /*
bd30add8
TH		 3059 * Filter TPM commands by default. These provide an
3060 * essentially uncontrolled encrypted "back door" between
3061 * applications and the disk. Set libata.allow_tpm=1 if you
3062 * have a real reason for wanting to use them. This ensures
3063 * that installed software cannot easily mess stuff up without
3064 * user intent. DVR type users will probably ship with this enabled
3065 * for movie content management.
b095518e 3066 *
bd30add8
TH		 3067 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3068 * for this and should do in future but that it is not sufficient as
3069 * DCS is an optional feature set. Thus we also do the software filter
3070 * so that we comply with the TC consortium stated goal that the user
3071 * can turn off TC features of their system.
b095518e 3072 */
bd30add8
TH		 3073 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
3074 goto invalid_fld;
e61e0672 3075
b095518e 3076 return 0;
9a405257
TH		 3077
3078 invalid_fld:
542b1444 3079 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
9a405257
TH		 3080 /* "Invalid field in cdb" */
3081 return 1;
b095518e
JG		 3082}
3083
18f0f978
CH		 3084static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3085{
3086 struct ata_taskfile *tf = &qc->tf;
3087 struct scsi_cmnd *scmd = qc->scsicmd;
3088 struct ata_device *dev = qc->dev;
3089 const u8 *cdb = scmd->cmnd;
3090 u64 block;
3091 u32 n_block;
3092 u32 size;
3093 void *buf;
3094
3095 /* we may not issue DMA commands if no DMA mode is set */
3096 if (unlikely(!dev->dma_mode))
3097 goto invalid_fld;
3098
3099 if (unlikely(scmd->cmd_len < 16))
3100 goto invalid_fld;
3101 scsi_16_lba_len(cdb, &block, &n_block);
3102
3103 /* for now we only support WRITE SAME with the unmap bit set */
3104 if (unlikely(!(cdb[1] & 0x8)))
3105 goto invalid_fld;
3106
3107 /*
3108 * WRITE SAME always has a sector sized buffer as payload, this
3109 * should never be a multiple entry S/G list.
3110 */
3111 if (!scsi_sg_count(scmd))
3112 goto invalid_fld;
3113
3114 buf = page_address(sg_page(scsi_sglist(scmd)));
d0634c4a 3115 size = ata_set_lba_range_entries(buf, 512, block, n_block);
18f0f978
CH		 3116
3117 tf->protocol = ATA_PROT_DMA;
3118 tf->hob_feature = 0;
3119 tf->feature = ATA_DSM_TRIM;
3120 tf->hob_nsect = (size / 512) >> 8;
3121 tf->nsect = size / 512;
3122 tf->command = ATA_CMD_DSM;
3123 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3124 ATA_TFLAG_WRITE;
3125
3126 ata_qc_set_pc_nbytes(qc);
3127
3128 return 0;
3129
3130 invalid_fld:
3131 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3132 /* "Invalid field in cdb" */
3133 return 1;
3134}
3135
1b26d29c
PB		 3136/**
3137 * ata_mselect_caching - Simulate MODE SELECT for caching info page
3138 * @qc: Storage for translated ATA taskfile
3139 * @buf: input buffer
3140 * @len: number of valid bytes in the input buffer
3141 *
3142 * Prepare a taskfile to modify caching information for the device.
3143 *
3144 * LOCKING:
3145 * None.
3146 */
3147static int ata_mselect_caching(struct ata_queued_cmd *qc,
3148 const u8 *buf, int len)
3149{
3150 struct ata_taskfile *tf = &qc->tf;
3151 struct ata_device *dev = qc->dev;
3152 char mpage[CACHE_MPAGE_LEN];
3153 u8 wce;
3154
3155 /*
3156 * The first two bytes of def_cache_mpage are a header, so offsets
3157 * in mpage are off by 2 compared to buf. Same for len.
3158 */
3159
3160 if (len != CACHE_MPAGE_LEN - 2)
3161 return -EINVAL;
3162
3163 wce = buf[0] & (1 << 2);
3164
3165 /*
3166 * Check that read-only bits are not modified.
3167 */
3168 ata_msense_caching(dev->id, mpage, false);
3169 mpage[2] &= ~(1 << 2);
3170 mpage[2] |= wce;
3171 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0)
3172 return -EINVAL;
3173
3174 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3175 tf->protocol = ATA_PROT_NODATA;
3176 tf->nsect = 0;
3177 tf->command = ATA_CMD_SET_FEATURES;
3178 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF;
3179 return 0;
3180}
3181
3182/**
3183 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands
3184 * @qc: Storage for translated ATA taskfile
3185 *
3186 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
3187 * Assume this is invoked for direct access devices (e.g. disks) only.
3188 * There should be no block descriptor for other device types.
3189 *
3190 * LOCKING:
3191 * spin_lock_irqsave(host lock)
3192 */
3193static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
3194{
3195 struct scsi_cmnd *scmd = qc->scsicmd;
3196 const u8 *cdb = scmd->cmnd;
3197 const u8 *p;
3198 u8 pg, spg;
3199 unsigned six_byte, pg_len, hdr_len, bd_len;
3200 int len;
3201
3202 VPRINTK("ENTER\n");
3203
3204 six_byte = (cdb[0] == MODE_SELECT);
3205 if (six_byte) {
3206 if (scmd->cmd_len < 5)
3207 goto invalid_fld;
3208
3209 len = cdb[4];
3210 hdr_len = 4;
3211 } else {
3212 if (scmd->cmd_len < 9)
3213 goto invalid_fld;
3214
3215 len = (cdb[7] << 8) + cdb[8];
3216 hdr_len = 8;
3217 }
3218
3219 /* We only support PF=1, SP=0. */
3220 if ((cdb[1] & 0x11) != 0x10)
3221 goto invalid_fld;
3222
3223 /* Test early for possible overrun. */
3224 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len)
3225 goto invalid_param_len;
3226
3227 p = page_address(sg_page(scsi_sglist(scmd)));
3228
3229 /* Move past header and block descriptors. */
3230 if (len < hdr_len)
3231 goto invalid_param_len;
3232
3233 if (six_byte)
3234 bd_len = p[3];
3235 else
3236 bd_len = (p[6] << 8) + p[7];
3237
3238 len -= hdr_len;
3239 p += hdr_len;
3240 if (len < bd_len)
3241 goto invalid_param_len;
3242 if (bd_len != 0 && bd_len != 8)
3243 goto invalid_param;
3244
3245 len -= bd_len;
3246 p += bd_len;
3247 if (len == 0)
3248 goto skip;
3249
3250 /* Parse both possible formats for the mode page headers. */
3251 pg = p[0] & 0x3f;
3252 if (p[0] & 0x40) {
3253 if (len < 4)
3254 goto invalid_param_len;
3255
3256 spg = p[1];
3257 pg_len = (p[2] << 8) | p[3];
3258 p += 4;
3259 len -= 4;
3260 } else {
3261 if (len < 2)
3262 goto invalid_param_len;
3263
3264 spg = 0;
3265 pg_len = p[1];
3266 p += 2;
3267 len -= 2;
3268 }
3269
3270 /*
3271 * No mode subpages supported (yet) but asking for _all_
3272 * subpages may be valid
3273 */
3274 if (spg && (spg != ALL_SUB_MPAGES))
3275 goto invalid_param;
3276 if (pg_len > len)
3277 goto invalid_param_len;
3278
3279 switch (pg) {
3280 case CACHE_MPAGE:
3281 if (ata_mselect_caching(qc, p, pg_len) < 0)
3282 goto invalid_param;
3283 break;
3284
3285 default: /* invalid page code */
3286 goto invalid_param;
3287 }
3288
3289 /*
3290 * Only one page has changeable data, so we only support setting one
3291 * page at a time.
3292 */
3293 if (len > pg_len)
3294 goto invalid_param;
3295
3296 return 0;
3297
3298 invalid_fld:
3299 /* "Invalid field in CDB" */
3300 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
3301 return 1;
3302
3303 invalid_param:
3304 /* "Invalid field in parameter list" */
3305 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0);
3306 return 1;
3307
3308 invalid_param_len:
3309 /* "Parameter list length error" */
3310 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3311 return 1;
3312
3313 skip:
3314 scmd->result = SAM_STAT_GOOD;
3315 return 1;
3316}
3317
1da177e4
LT		 3318/**
3319 * ata_get_xlat_func - check if SCSI to ATA translation is possible
3320 * @dev: ATA device
3321 * @cmd: SCSI command opcode to consider
3322 *
3323 * Look up the SCSI command given, and determine whether the
3324 * SCSI command is to be translated or simulated.
3325 *
3326 * RETURNS:
3327 * Pointer to translation function if possible, %NULL if not.
3328 */
3329
3330static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
3331{
3332 switch (cmd) {
3333 case READ_6:
3334 case READ_10:
3335 case READ_16:
3336
3337 case WRITE_6:
3338 case WRITE_10:
3339 case WRITE_16:
3340 return ata_scsi_rw_xlat;
3341
0cdd6eb7 3342 case WRITE_SAME_16:
18f0f978
CH		 3343 return ata_scsi_write_same_xlat;
3344
1da177e4
LT		 3345 case SYNCHRONIZE_CACHE:
3346 if (ata_try_flush_cache(dev))
3347 return ata_scsi_flush_xlat;
3348 break;
3349
3350 case VERIFY:
3351 case VERIFY_16:
3352 return ata_scsi_verify_xlat;
b095518e
JG		 3353
3354 case ATA_12:
3355 case ATA_16:
3356 return ata_scsi_pass_thru;
da61396d 3357
1b26d29c
PB		 3358 case MODE_SELECT:
3359 case MODE_SELECT_10:
3360 return ata_scsi_mode_select_xlat;
3361 break;
3362
972dcafb
DG		 3363 case START_STOP:
3364 return ata_scsi_start_stop_xlat;
1da177e4
LT		 3365 }
3366
3367 return NULL;
3368}
3369
3370/**
3371 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3372 * @ap: ATA port to which the command was being sent
3373 * @cmd: SCSI command to dump
3374 *
3375 * Prints the contents of a SCSI command via printk().
3376 */
3377
3378static inline void ata_scsi_dump_cdb(struct ata_port *ap,
3379 struct scsi_cmnd *cmd)
3380{
3381#ifdef ATA_DEBUG
3382 struct scsi_device *scsidev = cmd->device;
3383 u8 *scsicmd = cmd->cmnd;
3384
3385 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
44877b4e 3386 ap->print_id,
1da177e4
LT		 3387 scsidev->channel, scsidev->id, scsidev->lun,
3388 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
3389 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
3390 scsicmd[8]);
3391#endif
3392}
3393
542b1444 3394static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2115ea94 3395 struct ata_device *dev)
eb3f0f9c 3396{
baf4fdfa
ML		 3397 u8 scsi_op = scmd->cmnd[0];
3398 ata_xlat_func_t xlat_func;
2115ea94
TH		 3399 int rc = 0;
3400
eb3f0f9c 3401 if (dev->class == ATA_DEV_ATA) {
baf4fdfa
ML		 3402 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
3403 goto bad_cdb_len;
eb3f0f9c 3404
baf4fdfa
ML		 3405 xlat_func = ata_get_xlat_func(dev, scsi_op);
3406 } else {
3407 if (unlikely(!scmd->cmd_len))
3408 goto bad_cdb_len;
3409
3410 xlat_func = NULL;
3411 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
3412 /* relay SCSI command to ATAPI device */
607126c2
ML		 3413 int len = COMMAND_SIZE(scsi_op);
3414 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
baf4fdfa
ML		 3415 goto bad_cdb_len;
3416
3417 xlat_func = atapi_xlat;
3418 } else {
3419 /* ATA_16 passthru, treat as an ATA command */
3420 if (unlikely(scmd->cmd_len > 16))
3421 goto bad_cdb_len;
3422
3423 xlat_func = ata_get_xlat_func(dev, scsi_op);
3424 }
3425 }
3426
3427 if (xlat_func)
b27dcfb0 3428 rc = ata_scsi_translate(dev, scmd, xlat_func);
baf4fdfa 3429 else
b27dcfb0 3430 ata_scsi_simulate(dev, scmd);
2115ea94
TH		 3431
3432 return rc;
baf4fdfa
ML		 3433
3434 bad_cdb_len:
3435 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3436 scmd->cmd_len, scsi_op, dev->cdb_len);
3437 scmd->result = DID_ERROR << 16;
b27dcfb0 3438 scmd->scsi_done(scmd);
baf4fdfa 3439 return 0;
eb3f0f9c
BK		 3440}
3441
1da177e4
LT		 3442/**
3443 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
23e701e6 3444 * @shost: SCSI host of command to be sent
1da177e4 3445 * @cmd: SCSI command to be sent
1da177e4
LT		 3446 *
3447 * In some cases, this function translates SCSI commands into
3448 * ATA taskfiles, and queues the taskfiles to be sent to
3449 * hardware. In other cases, this function simulates a
3450 * SCSI device by evaluating and responding to certain
3451 * SCSI commands. This creates the overall effect of
3452 * ATA and ATAPI devices appearing as SCSI devices.
3453 *
3454 * LOCKING:
23e701e6 3455 * ATA host lock
1da177e4
LT		 3456 *
3457 * RETURNS:
2115ea94
TH		 3458 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3459 * 0 otherwise.
1da177e4 3460 */
23e701e6 3461int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
1da177e4
LT		 3462{
3463 struct ata_port *ap;
3464 struct ata_device *dev;
3465 struct scsi_device *scsidev = cmd->device;
2115ea94 3466 int rc = 0;
23e701e6 3467 unsigned long irq_flags;
1da177e4 3468
35bb94b1 3469 ap = ata_shost_to_port(shost);
005a5a06 3470
23e701e6 3471 spin_lock_irqsave(ap->lock, irq_flags);
1da177e4
LT		 3472
3473 ata_scsi_dump_cdb(ap, cmd);
3474
3475 dev = ata_scsi_find_dev(ap, scsidev);
eb3f0f9c 3476 if (likely(dev))
b27dcfb0 3477 rc = __ata_scsi_queuecmd(cmd, dev);
eb3f0f9c 3478 else {
1da177e4 3479 cmd->result = (DID_BAD_TARGET << 16);
23e701e6 3480 cmd->scsi_done(cmd);
1da177e4
LT		 3481 }
3482
23e701e6
JG		 3483 spin_unlock_irqrestore(ap->lock, irq_flags);
3484
2115ea94 3485 return rc;
1da177e4
LT		 3486}
3487
3488/**
3489 * ata_scsi_simulate - simulate SCSI command on ATA device
c893a3ae 3490 * @dev: the target device
1da177e4 3491 * @cmd: SCSI command being sent to device.
1da177e4
LT		 3492 *
3493 * Interprets and directly executes a select list of SCSI commands
3494 * that can be handled internally.
3495 *
3496 * LOCKING:
cca3974e 3497 * spin_lock_irqsave(host lock)
1da177e4
LT		 3498 */
3499
b27dcfb0 3500void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
1da177e4
LT		 3501{
3502 struct ata_scsi_args args;
057ace5e 3503 const u8 *scsicmd = cmd->cmnd;
45394145 3504 u8 tmp8;
1da177e4 3505
9a3dccc4
TH		 3506 args.dev = dev;
3507 args.id = dev->id;
1da177e4 3508 args.cmd = cmd;
b27dcfb0 3509 args.done = cmd->scsi_done;
1da177e4
LT		 3510
3511 switch(scsicmd[0]) {
2dcb407e
JG		 3512 /* TODO: worth improving? */
3513 case FORMAT_UNIT:
b27dcfb0 3514 ata_scsi_invalid_field(cmd);
2dcb407e
JG		 3515 break;
3516
3517 case INQUIRY:
3518 if (scsicmd[1] & 2) /* is CmdDt set? */
b27dcfb0 3519 ata_scsi_invalid_field(cmd);
2dcb407e
JG		 3520 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3521 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3522 else switch (scsicmd[2]) {
3523 case 0x00:
3524 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
1da177e4 3525 break;
2dcb407e
JG		 3526 case 0x80:
3527 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
1da177e4 3528 break;
2dcb407e
JG		 3529 case 0x83:
3530 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
1da177e4 3531 break;
2dcb407e
JG		 3532 case 0x89:
3533 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3534 break;
18f0f978
CH		 3535 case 0xb0:
3536 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
3537 break;
1e9dbc92
MW		 3538 case 0xb1:
3539 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3540 break;
02e0a604
MP		 3541 case 0xb2:
3542 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
3543 break;
2dcb407e 3544 default:
b27dcfb0 3545 ata_scsi_invalid_field(cmd);
1da177e4 3546 break;
2dcb407e
JG		 3547 }
3548 break;
3549
3550 case MODE_SENSE:
3551 case MODE_SENSE_10:
3552 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3553 break;
3554
2dcb407e
JG		 3555 case READ_CAPACITY:
3556 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3557 break;
3558
3559 case SERVICE_ACTION_IN:
3560 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
1da177e4 3561 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2dcb407e 3562 else
b27dcfb0 3563 ata_scsi_invalid_field(cmd);
2dcb407e 3564 break;
1da177e4 3565
2dcb407e
JG		 3566 case REPORT_LUNS:
3567 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3568 break;
1da177e4 3569
2dcb407e
JG		 3570 case REQUEST_SENSE:
3571 ata_scsi_set_sense(cmd, 0, 0, 0);
3572 cmd->result = (DRIVER_SENSE << 24);
b27dcfb0 3573 cmd->scsi_done(cmd);
2dcb407e 3574 break;
1da177e4 3575
2dcb407e
JG		 3576 /* if we reach this, then writeback caching is disabled,
3577 * turning this into a no-op.
3578 */
3579 case SYNCHRONIZE_CACHE:
3580 /* fall through */
3581
3582 /* no-op's, complete with success */
3583 case REZERO_UNIT:
3584 case SEEK_6:
3585 case SEEK_10:
3586 case TEST_UNIT_READY:
3587 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3588 break;
45394145 3589
2dcb407e
JG		 3590 case SEND_DIAGNOSTIC:
3591 tmp8 = scsicmd[1] & ~(1 << 3);
3592 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
00bd0202 3593 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
2dcb407e 3594 else
b27dcfb0 3595 ata_scsi_invalid_field(cmd);
2dcb407e 3596 break;
1da177e4 3597
2dcb407e
JG		 3598 /* all other commands */
3599 default:
3600 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3601 /* "Invalid command operation code" */
b27dcfb0 3602 cmd->scsi_done(cmd);
2dcb407e 3603 break;
1da177e4
LT		 3604 }
3605}
3606
f3187195
TH		 3607int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3608{
3609 int i, rc;
3610
3611 for (i = 0; i < host->n_ports; i++) {
3612 struct ata_port *ap = host->ports[i];
3613 struct Scsi_Host *shost;
3614
3615 rc = -ENOMEM;
3616 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3617 if (!shost)
3618 goto err_alloc;
3619
9ee4f393 3620 shost->eh_noresume = 1;
f3187195
TH		 3621 *(struct ata_port **)&shost->hostdata[0] = ap;
3622 ap->scsi_host = shost;
3623
d9027470 3624 shost->transportt = ata_scsi_transport_template;
f3187195
TH		 3625 shost->unique_id = ap->print_id;
3626 shost->max_id = 16;
3627 shost->max_lun = 1;
3628 shost->max_channel = 1;
3629 shost->max_cmd_len = 16;
8562d028 3630 shost->no_write_same = 1;
f3187195 3631
31cc23b3
TH		 3632 /* Schedule policy is determined by ->qc_defer()
3633 * callback and it needs to see every deferred qc.
3634 * Set host_blocked to 1 to prevent SCSI midlayer from
3635 * automatically deferring requests.
3636 */
3637 shost->max_host_blocked = 1;
3638
f8fc75dc
LM		 3639 rc = scsi_add_host_with_dma(ap->scsi_host,
3640 &ap->tdev, ap->host->dev);
f3187195
TH		 3641 if (rc)
3642 goto err_add;
3643 }
3644
3645 return 0;
3646
3647 err_add:
3648 scsi_host_put(host->ports[i]->scsi_host);
3649 err_alloc:
3650 while (--i >= 0) {
3651 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3652
3653 scsi_remove_host(shost);
3654 scsi_host_put(shost);
3655 }
3656 return rc;
3657}
3658
1ae46317 3659void ata_scsi_scan_host(struct ata_port *ap, int sync)
644dd0cc 3660{
1ae46317
TH		 3661 int tries = 5;
3662 struct ata_device *last_failed_dev = NULL;
41bda9c9 3663 struct ata_link *link;
1ae46317 3664 struct ata_device *dev;
644dd0cc 3665
1ae46317 3666 repeat:
1eca4365
TH		 3667 ata_for_each_link(link, ap, EDGE) {
3668 ata_for_each_dev(dev, link, ENABLED) {
41bda9c9
TH		 3669 struct scsi_device *sdev;
3670 int channel = 0, id = 0;
3edebac4 3671
1eca4365 3672 if (dev->sdev)
41bda9c9 3673 continue;
3f19ee8c 3674
41bda9c9
TH		 3675 if (ata_is_host_link(link))
3676 id = dev->devno;
3677 else
3678 channel = link->pmp;
3679
3680 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3681 NULL);
3682 if (!IS_ERR(sdev)) {
3683 dev->sdev = sdev;
3684 scsi_device_put(sdev);
7381fe73
AL		 3685 if (zpodd_dev_enabled(dev))
3686 dev_pm_qos_expose_flags(
3687 &sdev->sdev_gendev, 0);
295124dc
GG		 3688 } else {
3689 dev->sdev = NULL;
41bda9c9 3690 }
3edebac4 3691 }
3f19ee8c 3692 }
1ae46317
TH		 3693
3694 /* If we scanned while EH was in progress or allocation
3695 * failure occurred, scan would have failed silently. Check
3696 * whether all devices are attached.
3697 */
1eca4365
TH		 3698 ata_for_each_link(link, ap, EDGE) {
3699 ata_for_each_dev(dev, link, ENABLED) {
3700 if (!dev->sdev)
41bda9c9
TH		 3701 goto exit_loop;
3702 }
1ae46317 3703 }
41bda9c9
TH		 3704 exit_loop:
3705 if (!link)
1ae46317
TH		 3706 return;
3707
3708 /* we're missing some SCSI devices */
3709 if (sync) {
3710 /* If caller requested synchrnous scan && we've made
3711 * any progress, sleep briefly and repeat.
3712 */
3713 if (dev != last_failed_dev) {
3714 msleep(100);
3715 last_failed_dev = dev;
3716 goto repeat;
3717 }
3718
3719 /* We might be failing to detect boot device, give it
3720 * a few more chances.
3721 */
3722 if (--tries) {
3723 msleep(100);
3724 goto repeat;
3725 }
3726
a9a79dfe
JP		 3727 ata_port_err(ap,
3728 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
1ae46317
TH		 3729 }
3730
ad72cf98 3731 queue_delayed_work(system_long_wq, &ap->hotplug_task,
1ae46317 3732 round_jiffies_relative(HZ));
644dd0cc 3733}
0ea035a3
TH		 3734
3735/**
3736 * ata_scsi_offline_dev - offline attached SCSI device
3737 * @dev: ATA device to offline attached SCSI device for
3738 *
3739 * This function is called from ata_eh_hotplug() and responsible
3740 * for taking the SCSI device attached to @dev offline. This
cca3974e 3741 * function is called with host lock which protects dev->sdev
0ea035a3
TH		 3742 * against clearing.
3743 *
3744 * LOCKING:
cca3974e 3745 * spin_lock_irqsave(host lock)
0ea035a3
TH		 3746 *
3747 * RETURNS:
3748 * 1 if attached SCSI device exists, 0 otherwise.
3749 */
3750int ata_scsi_offline_dev(struct ata_device *dev)
3751{
3752 if (dev->sdev) {
3753 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3754 return 1;
3755 }
3756 return 0;
3757}
580b2102
TH		 3758
3759/**
3760 * ata_scsi_remove_dev - remove attached SCSI device
3761 * @dev: ATA device to remove attached SCSI device for
3762 *
3763 * This function is called from ata_eh_scsi_hotplug() and
3764 * responsible for removing the SCSI device attached to @dev.
3765 *
3766 * LOCKING:
3767 * Kernel thread context (may sleep).
3768 */
3769static void ata_scsi_remove_dev(struct ata_device *dev)
3770{
9af5c9c9 3771 struct ata_port *ap = dev->link->ap;
580b2102
TH		 3772 struct scsi_device *sdev;
3773 unsigned long flags;
3774
3775 /* Alas, we need to grab scan_mutex to ensure SCSI device
3776 * state doesn't change underneath us and thus
3777 * scsi_device_get() always succeeds. The mutex locking can
3778 * be removed if there is __scsi_device_get() interface which
3779 * increments reference counts regardless of device state.
3780 */
cca3974e 3781 mutex_lock(&ap->scsi_host->scan_mutex);
ba6a1308 3782 spin_lock_irqsave(ap->lock, flags);
580b2102 3783
afe75951
AL		 3784 if (zpodd_dev_enabled(dev))
3785 zpodd_exit(dev);
3bd46600 3786
cca3974e 3787 /* clearing dev->sdev is protected by host lock */
580b2102
TH		 3788 sdev = dev->sdev;
3789 dev->sdev = NULL;
3790
3791 if (sdev) {
3792 /* If user initiated unplug races with us, sdev can go
cca3974e 3793 * away underneath us after the host lock and
580b2102
TH		 3794 * scan_mutex are released. Hold onto it.
3795 */
3796 if (scsi_device_get(sdev) == 0) {
3797 /* The following ensures the attached sdev is
3798 * offline on return from ata_scsi_offline_dev()
3799 * regardless it wins or loses the race
3800 * against this function.
3801 */
3802 scsi_device_set_state(sdev, SDEV_OFFLINE);
3803 } else {
3804 WARN_ON(1);
3805 sdev = NULL;
3806 }
3807 }
3808
ba6a1308 3809 spin_unlock_irqrestore(ap->lock, flags);
cca3974e 3810 mutex_unlock(&ap->scsi_host->scan_mutex);
580b2102
TH		 3811
3812 if (sdev) {
a9a79dfe
JP		 3813 ata_dev_info(dev, "detaching (SCSI %s)\n",
3814 dev_name(&sdev->sdev_gendev));
580b2102
TH		 3815
3816 scsi_remove_device(sdev);
3817 scsi_device_put(sdev);
3818 }
3819}
3820
41bda9c9
TH		 3821static void ata_scsi_handle_link_detach(struct ata_link *link)
3822{
3823 struct ata_port *ap = link->ap;
3824 struct ata_device *dev;
3825
1eca4365 3826 ata_for_each_dev(dev, link, ALL) {
41bda9c9
TH		 3827 unsigned long flags;
3828
3829 if (!(dev->flags & ATA_DFLAG_DETACHED))
3830 continue;
3831
3832 spin_lock_irqsave(ap->lock, flags);
3833 dev->flags &= ~ATA_DFLAG_DETACHED;
3834 spin_unlock_irqrestore(ap->lock, flags);
3835
3836 ata_scsi_remove_dev(dev);
3837 }
3838}
3839
2f294968
KCA		 3840/**
3841 * ata_scsi_media_change_notify - send media change event
c5d0e6a0 3842 * @dev: Pointer to the disk device with media change event
2f294968
KCA		 3843 *
3844 * Tell the block layer to send a media change notification
3845 * event.
3846 *
3847 * LOCKING:
854c73a2 3848 * spin_lock_irqsave(host lock)
2f294968 3849 */
854c73a2 3850void ata_scsi_media_change_notify(struct ata_device *dev)
2f294968 3851{
854c73a2 3852 if (dev->sdev)
f26792d5
JG		 3853 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3854 GFP_ATOMIC);
2f294968 3855}
2f294968 3856
580b2102
TH		 3857/**
3858 * ata_scsi_hotplug - SCSI part of hotplug
65f27f38 3859 * @work: Pointer to ATA port to perform SCSI hotplug on
580b2102
TH		 3860 *
3861 * Perform SCSI part of hotplug. It's executed from a separate
3862 * workqueue after EH completes. This is necessary because SCSI
3863 * hot plugging requires working EH and hot unplugging is
3864 * synchronized with hot plugging with a mutex.
3865 *
3866 * LOCKING:
3867 * Kernel thread context (may sleep).
3868 */
65f27f38 3869void ata_scsi_hotplug(struct work_struct *work)
580b2102 3870{
65f27f38
DH		 3871 struct ata_port *ap =
3872 container_of(work, struct ata_port, hotplug_task.work);
41bda9c9 3873 int i;
580b2102 3874
b51e9e5d 3875 if (ap->pflags & ATA_PFLAG_UNLOADING) {
580b2102
TH		 3876 DPRINTK("ENTER/EXIT - unloading\n");
3877 return;
3878 }
3879
4e7255f3
TH		 3880 /*
3881 * XXX - UGLY HACK
3882 *
3883 * The block layer suspend/resume path is fundamentally broken due
3884 * to freezable kthreads and workqueue and may deadlock if a block
3885 * device gets removed while resume is in progress. I don't know
3886 * what the solution is short of removing freezable kthreads and
3887 * workqueues altogether.
3888 *
3889 * The following is an ugly hack to avoid kicking off device
3890 * removal while freezer is active. This is a joke but does avoid
3891 * this particular deadlock scenario.
3892 *
3893 * https://bugzilla.kernel.org/show_bug.cgi?id=62801
3894 * http://marc.info/?l=linux-kernel&m=138695698516487
3895 */
3896#ifdef CONFIG_FREEZER
3897 while (pm_freezing)
3898 msleep(10);
3899#endif
3900
580b2102 3901 DPRINTK("ENTER\n");
ad72cf98 3902 mutex_lock(&ap->scsi_scan_mutex);
580b2102 3903
41bda9c9
TH		 3904 /* Unplug detached devices. We cannot use link iterator here
3905 * because PMP links have to be scanned even if PMP is
3906 * currently not attached. Iterate manually.
3907 */
3908 ata_scsi_handle_link_detach(&ap->link);
3909 if (ap->pmp_link)
3910 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3911 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
580b2102
TH		 3912
3913 /* scan for new ones */
1ae46317 3914 ata_scsi_scan_host(ap, 0);
580b2102 3915
ad72cf98 3916 mutex_unlock(&ap->scsi_scan_mutex);
580b2102
TH		 3917 DPRINTK("EXIT\n");
3918}
83c47bcb
TH		 3919
3920/**
3921 * ata_scsi_user_scan - indication for user-initiated bus scan
3922 * @shost: SCSI host to scan
3923 * @channel: Channel to scan
3924 * @id: ID to scan
3925 * @lun: LUN to scan
3926 *
3927 * This function is called when user explicitly requests bus
3928 * scan. Set probe pending flag and invoke EH.
3929 *
3930 * LOCKING:
3931 * SCSI layer (we don't care)
3932 *
3933 * RETURNS:
3934 * Zero.
3935 */
d9027470
GG		 3936int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3937 unsigned int id, unsigned int lun)
83c47bcb
TH		 3938{
3939 struct ata_port *ap = ata_shost_to_port(shost);
3940 unsigned long flags;
41bda9c9 3941 int devno, rc = 0;
83c47bcb
TH		 3942
3943 if (!ap->ops->error_handler)
3944 return -EOPNOTSUPP;
3945
41bda9c9 3946 if (lun != SCAN_WILD_CARD && lun)
83c47bcb
TH		 3947 return -EINVAL;
3948
071f44b1 3949 if (!sata_pmp_attached(ap)) {
41bda9c9
TH		 3950 if (channel != SCAN_WILD_CARD && channel)
3951 return -EINVAL;
3952 devno = id;
3953 } else {
3954 if (id != SCAN_WILD_CARD && id)
3955 return -EINVAL;
3956 devno = channel;
3957 }
3958
ba6a1308 3959 spin_lock_irqsave(ap->lock, flags);
83c47bcb 3960
41bda9c9
TH		 3961 if (devno == SCAN_WILD_CARD) {
3962 struct ata_link *link;
3963
1eca4365 3964 ata_for_each_link(link, ap, EDGE) {
41bda9c9 3965 struct ata_eh_info *ehi = &link->eh_info;
b558eddd 3966 ehi->probe_mask |= ATA_ALL_DEVICES;
cf480626 3967 ehi->action |= ATA_EH_RESET;
41bda9c9 3968 }
83c47bcb 3969 } else {
41bda9c9 3970 struct ata_device *dev = ata_find_dev(ap, devno);
83c47bcb
TH		 3971
3972 if (dev) {
41bda9c9 3973 struct ata_eh_info *ehi = &dev->link->eh_info;
9af5c9c9 3974 ehi->probe_mask |= 1 << dev->devno;
cf480626 3975 ehi->action |= ATA_EH_RESET;
83c47bcb
TH		 3976 } else
3977 rc = -EINVAL;
3978 }
3979
309afcb5 3980 if (rc == 0) {
83c47bcb 3981 ata_port_schedule_eh(ap);
309afcb5
TH		 3982 spin_unlock_irqrestore(ap->lock, flags);
3983 ata_port_wait_eh(ap);
3984 } else
3985 spin_unlock_irqrestore(ap->lock, flags);
83c47bcb
TH		 3986
3987 return rc;
3988}
3057ac3c 3989
3990/**
d0171269 3991 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
65f27f38 3992 * @work: Pointer to ATA port to perform scsi_rescan_device()
3057ac3c 3993 *
d0171269 3994 * After ATA pass thru (SAT) commands are executed successfully,
ad72cf98 3995 * libata need to propagate the changes to SCSI layer.
3057ac3c 3996 *
d0171269
TH		 3997 * LOCKING:
3998 * Kernel thread context (may sleep).
3057ac3c 3999 */
65f27f38 4000void ata_scsi_dev_rescan(struct work_struct *work)
3057ac3c 4001{
65f27f38
DH		 4002 struct ata_port *ap =
4003 container_of(work, struct ata_port, scsi_rescan_task);
41bda9c9 4004 struct ata_link *link;
f58229f8 4005 struct ata_device *dev;
f84e7e41 4006 unsigned long flags;
3057ac3c 4007
ad72cf98 4008 mutex_lock(&ap->scsi_scan_mutex);
f84e7e41
TH		 4009 spin_lock_irqsave(ap->lock, flags);
4010
1eca4365
TH		 4011 ata_for_each_link(link, ap, EDGE) {
4012 ata_for_each_dev(dev, link, ENABLED) {
41bda9c9 4013 struct scsi_device *sdev = dev->sdev;
3057ac3c 4014
1eca4365 4015 if (!sdev)
41bda9c9
TH		 4016 continue;
4017 if (scsi_device_get(sdev))
4018 continue;
f84e7e41 4019
41bda9c9
TH		 4020 spin_unlock_irqrestore(ap->lock, flags);
4021 scsi_rescan_device(&(sdev->sdev_gendev));
4022 scsi_device_put(sdev);
4023 spin_lock_irqsave(ap->lock, flags);
4024 }
3057ac3c 4025 }
f84e7e41
TH		 4026
4027 spin_unlock_irqrestore(ap->lock, flags);
ad72cf98 4028 mutex_unlock(&ap->scsi_scan_mutex);
3057ac3c 4029}
80289167
BK		 4030
4031/**
4032 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
4f931374 4033 * @host: ATA host container for all SAS ports
80289167 4034 * @port_info: Information from low-level host driver
cca3974e 4035 * @shost: SCSI host that the scsi device is attached to
80289167
BK		 4036 *
4037 * LOCKING:
4038 * PCI/etc. bus probe sem.
4039 *
4040 * RETURNS:
4041 * ata_port pointer on success / NULL on failure.
4042 */
4043
cca3974e 4044struct ata_port *ata_sas_port_alloc(struct ata_host *host,
80289167 4045 struct ata_port_info *port_info,
cca3974e 4046 struct Scsi_Host *shost)
80289167 4047{
f3187195 4048 struct ata_port *ap;
80289167 4049
f3187195 4050 ap = ata_port_alloc(host);
80289167
BK		 4051 if (!ap)
4052 return NULL;
4053
f3187195 4054 ap->port_no = 0;
a29b5dad 4055 ap->lock = &host->lock;
f3187195
TH		 4056 ap->pio_mask = port_info->pio_mask;
4057 ap->mwdma_mask = port_info->mwdma_mask;
4058 ap->udma_mask = port_info->udma_mask;
4059 ap->flags |= port_info->flags;
4060 ap->ops = port_info->port_ops;
4061 ap->cbl = ATA_CBL_SATA;
4062
80289167
BK		 4063 return ap;
4064}
4065EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
4066
4067/**
4068 * ata_sas_port_start - Set port up for dma.
4069 * @ap: Port to initialize
4070 *
4071 * Called just after data structures for each port are
dde20207 4072 * initialized.
80289167
BK		 4073 *
4074 * May be used as the port_start() entry in ata_port_operations.
4075 *
4076 * LOCKING:
4077 * Inherited from caller.
4078 */
4079int ata_sas_port_start(struct ata_port *ap)
4080{
3f1e046a
NA		 4081 /*
4082 * the port is marked as frozen at allocation time, but if we don't
4083 * have new eh, we won't thaw it
4084 */
4085 if (!ap->ops->error_handler)
4086 ap->pflags &= ~ATA_PFLAG_FROZEN;
dde20207 4087 return 0;
80289167
BK		 4088}
4089EXPORT_SYMBOL_GPL(ata_sas_port_start);
4090
4091/**
4092 * ata_port_stop - Undo ata_sas_port_start()
4093 * @ap: Port to shut down
4094 *
80289167
BK		 4095 * May be used as the port_stop() entry in ata_port_operations.
4096 *
4097 * LOCKING:
4098 * Inherited from caller.
4099 */
4100
4101void ata_sas_port_stop(struct ata_port *ap)
4102{
80289167
BK		 4103}
4104EXPORT_SYMBOL_GPL(ata_sas_port_stop);
4105
b2024459
DW		 4106/**
4107 * ata_sas_async_probe - simply schedule probing and return
4108 * @ap: Port to probe
4109 *
4110 * For batch scheduling of probe for sas attached ata devices, assumes
4111 * the port has already been through ata_sas_port_init()
4112 */
4113void ata_sas_async_probe(struct ata_port *ap)
9508a66f 4114{
b2024459
DW		 4115 __ata_port_probe(ap);
4116}
4117EXPORT_SYMBOL_GPL(ata_sas_async_probe);
9508a66f 4118
b2024459
DW		 4119int ata_sas_sync_probe(struct ata_port *ap)
4120{
4121 return ata_port_probe(ap);
9508a66f 4122}
b2024459
DW		 4123EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
4124
9508a66f 4125
80289167
BK		 4126/**
4127 * ata_sas_port_init - Initialize a SATA device
4128 * @ap: SATA port to initialize
4129 *
4130 * LOCKING:
4131 * PCI/etc. bus probe sem.
4132 *
4133 * RETURNS:
4134 * Zero on success, non-zero on error.
4135 */
4136
4137int ata_sas_port_init(struct ata_port *ap)
4138{
4139 int rc = ap->ops->port_start(ap);
4140
b2024459
DW		 4141 if (rc)
4142 return rc;
4143 ap->print_id = atomic_inc_return(&ata_print_id);
4144 return 0;
80289167
BK		 4145}
4146EXPORT_SYMBOL_GPL(ata_sas_port_init);
4147
4148/**
4149 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
4150 * @ap: SATA port to destroy
4151 *
4152 */
4153
4154void ata_sas_port_destroy(struct ata_port *ap)
4155{
f0d36efd
TH		 4156 if (ap->ops->port_stop)
4157 ap->ops->port_stop(ap);
80289167
BK		 4158 kfree(ap);
4159}
4160EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
4161
4162/**
4163 * ata_sas_slave_configure - Default slave_config routine for libata devices
4164 * @sdev: SCSI device to configure
4165 * @ap: ATA port to which SCSI device is attached
4166 *
4167 * RETURNS:
4168 * Zero.
4169 */
4170
4171int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
4172{
4173 ata_scsi_sdev_config(sdev);
9af5c9c9 4174 ata_scsi_dev_config(sdev, ap->link.device);
80289167
BK		 4175 return 0;
4176}
4177EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
4178
4179/**
4180 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
4181 * @cmd: SCSI command to be sent
80289167
BK		 4182 * @ap: ATA port to which the command is being sent
4183 *
4184 * RETURNS:
08475a19
BK		 4185 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4186 * 0 otherwise.
80289167
BK		 4187 */
4188
b27dcfb0 4189int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
80289167 4190{
08475a19
BK		 4191 int rc = 0;
4192
80289167
BK		 4193 ata_scsi_dump_cdb(ap, cmd);
4194
2486fa56 4195 if (likely(ata_dev_enabled(ap->link.device)))
b27dcfb0 4196 rc = __ata_scsi_queuecmd(cmd, ap->link.device);
80289167
BK		 4197 else {
4198 cmd->result = (DID_BAD_TARGET << 16);
b27dcfb0 4199 cmd->scsi_done(cmd);
80289167 4200 }
08475a19 4201 return rc;
80289167
BK		 4202}
4203EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
kernel source for telekom puls (alcatel/mediatek)