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libata: implement ata_host_detach()
[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 *
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
6 * on emails.
7 *
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
10 *
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 *
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
29 *
30 * Hardware documentation available from
31 * - http://www.t10.org/
32 * - http://www.t13.org/
33 *
1da177e4
LT		 34 */
35
36#include <linux/kernel.h>
37#include <linux/blkdev.h>
38#include <linux/spinlock.h>
39#include <scsi/scsi.h>
1da177e4 40#include <scsi/scsi_host.h>
beb40487 41#include <scsi/scsi_cmnd.h>
85837ebd 42#include <scsi/scsi_eh.h>
005a5a06 43#include <scsi/scsi_device.h>
a6e6ce8e 44#include <scsi/scsi_tcq.h>
30afc84c 45#include <scsi/scsi_transport.h>
1da177e4 46#include <linux/libata.h>
b095518e 47#include <linux/hdreg.h>
1da177e4
LT		 48#include <asm/uaccess.h>
49
50#include "libata.h"
51
b095518e
JG		 52#define SECTOR_SIZE 512
53
ad706991 54typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
ab5b3a5b
TH		 55
56static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
57 const struct scsi_device *scsidev);
58static struct ata_device * ata_scsi_find_dev(struct ata_port *ap,
59 const struct scsi_device *scsidev);
83c47bcb
TH		 60static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
61 unsigned int id, unsigned int lun);
ab5b3a5b 62
1da177e4 63
00ac37f5
DG		 64#define RW_RECOVERY_MPAGE 0x1
65#define RW_RECOVERY_MPAGE_LEN 12
66#define CACHE_MPAGE 0x8
67#define CACHE_MPAGE_LEN 20
68#define CONTROL_MPAGE 0xa
69#define CONTROL_MPAGE_LEN 12
70#define ALL_MPAGES 0x3f
71#define ALL_SUB_MPAGES 0xff
72
73
74static const u8 def_rw_recovery_mpage[] = {
75 RW_RECOVERY_MPAGE,
76 RW_RECOVERY_MPAGE_LEN - 2,
77 (1 << 7) | /* AWRE, sat-r06 say it shall be 0 */
78 (1 << 6), /* ARRE (auto read reallocation) */
79 0, /* read retry count */
80 0, 0, 0, 0,
81 0, /* write retry count */
82 0, 0, 0
83};
84
85static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
86 CACHE_MPAGE,
87 CACHE_MPAGE_LEN - 2,
88 0, /* contains WCE, needs to be 0 for logic */
89 0, 0, 0, 0, 0, 0, 0, 0, 0,
90 0, /* contains DRA, needs to be 0 for logic */
91 0, 0, 0, 0, 0, 0, 0
92};
93
94static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
95 CONTROL_MPAGE,
96 CONTROL_MPAGE_LEN - 2,
97 2, /* DSENSE=0, GLTSD=1 */
98 0, /* [QAM+QERR may be 1, see 05-359r1] */
99 0, 0, 0, 0, 0xff, 0xff,
100 0, 30 /* extended self test time, see 05-359r1 */
101};
102
30afc84c
TH		 103/*
104 * libata transport template. libata doesn't do real transport stuff.
105 * It just needs the eh_timed_out hook.
106 */
107struct scsi_transport_template ata_scsi_transport_template = {
9227c33d 108 .eh_strategy_handler = ata_scsi_error,
30afc84c 109 .eh_timed_out = ata_scsi_timed_out,
ccf68c34 110 .user_scan = ata_scsi_user_scan,
30afc84c
TH		 111};
112
1da177e4 113
ae006510
DG		 114static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
115 void (*done)(struct scsi_cmnd *))
116{
117 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
118 /* "Invalid field in cbd" */
119 done(cmd);
120}
121
1da177e4
LT		 122/**
123 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
124 * @sdev: SCSI device for which BIOS geometry is to be determined
125 * @bdev: block device associated with @sdev
126 * @capacity: capacity of SCSI device
127 * @geom: location to which geometry will be output
128 *
129 * Generic bios head/sector/cylinder calculator
130 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
131 * mapping. Some situations may arise where the disk is not
132 * bootable if this is not used.
133 *
134 * LOCKING:
135 * Defined by the SCSI layer. We don't really care.
136 *
137 * RETURNS:
138 * Zero.
139 */
140int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
141 sector_t capacity, int geom[])
142{
143 geom[0] = 255;
144 geom[1] = 63;
145 sector_div(capacity, 255*63);
146 geom[2] = capacity;
147
148 return 0;
149}
150
5924b74c
TH		 151/**
152 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
153 * @sdev: SCSI device to get identify data for
154 * @arg: User buffer area for identify data
155 *
156 * LOCKING:
157 * Defined by the SCSI layer. We don't really care.
158 *
159 * RETURNS:
160 * Zero on success, negative errno on error.
161 */
162static int ata_get_identity(struct scsi_device *sdev, void __user *arg)
163{
164 struct ata_port *ap = ata_shost_to_port(sdev->host);
165 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
166 u16 __user *dst = arg;
167 char buf[40];
168
169 if (!dev)
170 return -ENOMSG;
171
172 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
173 return -EFAULT;
174
175 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
176 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
177 return -EFAULT;
178
179 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
180 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
181 return -EFAULT;
182
183 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
184 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
185 return -EFAULT;
186
187 return 0;
188}
189
b095518e
JG		 190/**
191 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
8e8b77dd 192 * @scsidev: Device to which we are issuing command
b095518e
JG		 193 * @arg: User provided data for issuing command
194 *
195 * LOCKING:
196 * Defined by the SCSI layer. We don't really care.
197 *
198 * RETURNS:
199 * Zero on success, negative errno on error.
200 */
b095518e
JG		 201int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
202{
203 int rc = 0;
204 u8 scsi_cmd[MAX_COMMAND_SIZE];
bbe1fe7e 205 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
b095518e 206 int argsize = 0;
85837ebd 207 enum dma_data_direction data_dir;
bbe1fe7e 208 int cmd_result;
b095518e 209
c893a3ae 210 if (arg == NULL)
b095518e
JG		 211 return -EINVAL;
212
213 if (copy_from_user(args, arg, sizeof(args)))
214 return -EFAULT;
215
bbe1fe7e
ET		 216 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
217 if (!sensebuf)
218 return -ENOMEM;
219
b095518e
JG		 220 memset(scsi_cmd, 0, sizeof(scsi_cmd));
221
222 if (args[3]) {
223 argsize = SECTOR_SIZE * args[3];
224 argbuf = kmalloc(argsize, GFP_KERNEL);
54dac83c
JR		 225 if (argbuf == NULL) {
226 rc = -ENOMEM;
227 goto error;
228 }
b095518e
JG		 229
230 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
231 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
232 block count in sector count field */
85837ebd 233 data_dir = DMA_FROM_DEVICE;
b095518e
JG		 234 } else {
235 scsi_cmd[1] = (3 << 1); /* Non-data */
bbe1fe7e 236 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
85837ebd 237 data_dir = DMA_NONE;
b095518e
JG		 238 }
239
240 scsi_cmd[0] = ATA_16;
241
242 scsi_cmd[4] = args[2];
243 if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */
244 scsi_cmd[6] = args[3];
245 scsi_cmd[8] = args[1];
246 scsi_cmd[10] = 0x4f;
247 scsi_cmd[12] = 0xc2;
248 } else {
249 scsi_cmd[6] = args[1];
250 }
251 scsi_cmd[14] = args[0];
252
253 /* Good values for timeout and retries? Values below
254 from scsi_ioctl_send_command() for default case... */
bbe1fe7e
ET		 255 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
256 sensebuf, (10*HZ), 5, 0);
257
258 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
259 u8 *desc = sensebuf + 8;
260 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
261
262 /* If we set cc then ATA pass-through will cause a
263 * check condition even if no error. Filter that. */
264 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
265 struct scsi_sense_hdr sshdr;
266 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
267 &sshdr);
268 if (sshdr.sense_key==0 &&
269 sshdr.asc==0 && sshdr.ascq==0)
270 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
271 }
272
273 /* Send userspace a few ATA registers (same as drivers/ide) */
274 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
275 desc[0] == 0x09 ) { /* code is "ATA Descriptor" */
276 args[0] = desc[13]; /* status */
277 args[1] = desc[3]; /* error */
278 args[2] = desc[5]; /* sector count (0:7) */
279 if (copy_to_user(arg, args, sizeof(args)))
280 rc = -EFAULT;
281 }
282 }
283
284
285 if (cmd_result) {
b095518e
JG		 286 rc = -EIO;
287 goto error;
288 }
289
b095518e 290 if ((argbuf)
c893a3ae 291 && copy_to_user(arg + sizeof(args), argbuf, argsize))
b095518e
JG		 292 rc = -EFAULT;
293error:
bbe1fe7e 294 kfree(sensebuf);
8f760780 295 kfree(argbuf);
b095518e
JG		 296 return rc;
297}
298
299/**
300 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
8e8b77dd 301 * @scsidev: Device to which we are issuing command
b095518e
JG		 302 * @arg: User provided data for issuing command
303 *
304 * LOCKING:
305 * Defined by the SCSI layer. We don't really care.
306 *
307 * RETURNS:
308 * Zero on success, negative errno on error.
309 */
310int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
311{
312 int rc = 0;
313 u8 scsi_cmd[MAX_COMMAND_SIZE];
af068bd1
DM		 314 u8 args[7], *sensebuf = NULL;
315 int cmd_result;
b095518e 316
c893a3ae 317 if (arg == NULL)
b095518e
JG		 318 return -EINVAL;
319
320 if (copy_from_user(args, arg, sizeof(args)))
321 return -EFAULT;
322
af068bd1
DM		 323 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
324 if (!sensebuf)
325 return -ENOMEM;
326
b095518e
JG		 327 memset(scsi_cmd, 0, sizeof(scsi_cmd));
328 scsi_cmd[0] = ATA_16;
329 scsi_cmd[1] = (3 << 1); /* Non-data */
af068bd1 330 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
b095518e
JG		 331 scsi_cmd[4] = args[1];
332 scsi_cmd[6] = args[2];
333 scsi_cmd[8] = args[3];
334 scsi_cmd[10] = args[4];
335 scsi_cmd[12] = args[5];
336 scsi_cmd[14] = args[0];
337
b095518e 338 /* Good values for timeout and retries? Values below
2e9edbf8 339 from scsi_ioctl_send_command() for default case... */
af068bd1
DM		 340 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
341 sensebuf, (10*HZ), 5, 0);
342
343 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
344 u8 *desc = sensebuf + 8;
345 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
346
347 /* If we set cc then ATA pass-through will cause a
348 * check condition even if no error. Filter that. */
349 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
350 struct scsi_sense_hdr sshdr;
351 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
352 &sshdr);
353 if (sshdr.sense_key==0 &&
354 sshdr.asc==0 && sshdr.ascq==0)
355 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
356 }
357
358 /* Send userspace ATA registers */
359 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
360 desc[0] == 0x09) {/* code is "ATA Descriptor" */
361 args[0] = desc[13]; /* status */
362 args[1] = desc[3]; /* error */
363 args[2] = desc[5]; /* sector count (0:7) */
364 args[3] = desc[7]; /* lbal */
365 args[4] = desc[9]; /* lbam */
366 args[5] = desc[11]; /* lbah */
367 args[6] = desc[12]; /* select */
368 if (copy_to_user(arg, args, sizeof(args)))
369 rc = -EFAULT;
370 }
371 }
372
373 if (cmd_result) {
b095518e 374 rc = -EIO;
af068bd1
DM		 375 goto error;
376 }
b095518e 377
af068bd1
DM		 378 error:
379 kfree(sensebuf);
b095518e
JG		 380 return rc;
381}
382
1da177e4
LT		 383int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
384{
1da177e4
LT		 385 int val = -EINVAL, rc = -EINVAL;
386
1da177e4
LT		 387 switch (cmd) {
388 case ATA_IOC_GET_IO32:
389 val = 0;
390 if (copy_to_user(arg, &val, 1))
391 return -EFAULT;
392 return 0;
393
394 case ATA_IOC_SET_IO32:
395 val = (unsigned long) arg;
396 if (val != 0)
397 return -EINVAL;
398 return 0;
399
5924b74c
TH		 400 case HDIO_GET_IDENTITY:
401 return ata_get_identity(scsidev, arg);
402
b095518e
JG		 403 case HDIO_DRIVE_CMD:
404 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
405 return -EACCES;
406 return ata_cmd_ioctl(scsidev, arg);
407
408 case HDIO_DRIVE_TASK:
409 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
410 return -EACCES;
411 return ata_task_ioctl(scsidev, arg);
412
1da177e4
LT		 413 default:
414 rc = -ENOTTY;
415 break;
416 }
417
1da177e4
LT		 418 return rc;
419}
420
421/**
422 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
1da177e4
LT		 423 * @dev: ATA device to which the new command is attached
424 * @cmd: SCSI command that originated this ATA command
425 * @done: SCSI command completion function
426 *
427 * Obtain a reference to an unused ata_queued_cmd structure,
428 * which is the basic libata structure representing a single
429 * ATA command sent to the hardware.
430 *
431 * If a command was available, fill in the SCSI-specific
432 * portions of the structure with information on the
433 * current command.
434 *
435 * LOCKING:
cca3974e 436 * spin_lock_irqsave(host lock)
1da177e4
LT		 437 *
438 * RETURNS:
439 * Command allocated, or %NULL if none available.
440 */
7102d230
AB		 441static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
442 struct scsi_cmnd *cmd,
443 void (*done)(struct scsi_cmnd *))
1da177e4
LT		 444{
445 struct ata_queued_cmd *qc;
446
3373efd8 447 qc = ata_qc_new_init(dev);
1da177e4
LT		 448 if (qc) {
449 qc->scsicmd = cmd;
450 qc->scsidone = done;
451
452 if (cmd->use_sg) {
cedc9a47 453 qc->__sg = (struct scatterlist *) cmd->request_buffer;
1da177e4 454 qc->n_elem = cmd->use_sg;
7a801184 455 } else if (cmd->request_bufflen) {
cedc9a47 456 qc->__sg = &qc->sgent;
1da177e4
LT		 457 qc->n_elem = 1;
458 }
459 } else {
460 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
461 done(cmd);
462 }
463
464 return qc;
465}
466
b095518e
JG		 467/**
468 * ata_dump_status - user friendly display of error info
469 * @id: id of the port in question
470 * @tf: ptr to filled out taskfile
471 *
472 * Decode and dump the ATA error/status registers for the user so
473 * that they have some idea what really happened at the non
474 * make-believe layer.
475 *
476 * LOCKING:
477 * inherited from caller
478 */
7102d230 479static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
b095518e
JG		 480{
481 u8 stat = tf->command, err = tf->feature;
482
483 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
484 if (stat & ATA_BUSY) {
485 printk("Busy }\n"); /* Data is not valid in this case */
486 } else {
487 if (stat & 0x40) printk("DriveReady ");
488 if (stat & 0x20) printk("DeviceFault ");
489 if (stat & 0x10) printk("SeekComplete ");
490 if (stat & 0x08) printk("DataRequest ");
491 if (stat & 0x04) printk("CorrectedError ");
492 if (stat & 0x02) printk("Index ");
493 if (stat & 0x01) printk("Error ");
494 printk("}\n");
495
496 if (err) {
497 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
498 if (err & 0x04) printk("DriveStatusError ");
499 if (err & 0x80) {
500 if (err & 0x04) printk("BadCRC ");
501 else printk("Sector ");
502 }
503 if (err & 0x40) printk("UncorrectableError ");
504 if (err & 0x10) printk("SectorIdNotFound ");
505 if (err & 0x02) printk("TrackZeroNotFound ");
506 if (err & 0x01) printk("AddrMarkNotFound ");
507 printk("}\n");
508 }
509 }
510}
511
d6f26d1f
TH		 512/**
513 * ata_scsi_device_suspend - suspend ATA device associated with sdev
514 * @sdev: the SCSI device to suspend
3c5100c1 515 * @mesg: target power management message
d6f26d1f
TH		 516 *
517 * Request suspend EH action on the ATA device associated with
518 * @sdev and wait for the operation to complete.
519 *
520 * LOCKING:
521 * Kernel thread context (may sleep).
522 *
523 * RETURNS:
524 * 0 on success, -errno otherwise.
525 */
3c5100c1 526int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t mesg)
9b847548 527{
35bb94b1 528 struct ata_port *ap = ata_shost_to_port(sdev->host);
d6f26d1f
TH		 529 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
530 unsigned long flags;
531 unsigned int action;
532 int rc = 0;
533
534 if (!dev)
535 goto out;
536
537 spin_lock_irqsave(ap->lock, flags);
538
539 /* wait for the previous resume to complete */
540 while (dev->flags & ATA_DFLAG_SUSPENDED) {
541 spin_unlock_irqrestore(ap->lock, flags);
542 ata_port_wait_eh(ap);
543 spin_lock_irqsave(ap->lock, flags);
544 }
545
546 /* if @sdev is already detached, nothing to do */
547 if (sdev->sdev_state == SDEV_OFFLINE ||
548 sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
549 goto out_unlock;
550
551 /* request suspend */
552 action = ATA_EH_SUSPEND;
3c5100c1 553 if (mesg.event != PM_EVENT_SUSPEND)
d6f26d1f
TH		 554 action |= ATA_EH_PM_FREEZE;
555 ap->eh_info.dev_action[dev->devno] |= action;
556 ap->eh_info.flags |= ATA_EHI_QUIET;
557 ata_port_schedule_eh(ap);
558
559 spin_unlock_irqrestore(ap->lock, flags);
9b847548 560
d6f26d1f
TH		 561 /* wait for EH to do the job */
562 ata_port_wait_eh(ap);
563
564 spin_lock_irqsave(ap->lock, flags);
565
566 /* If @sdev is still attached but the associated ATA device
567 * isn't suspended, the operation failed.
568 */
569 if (sdev->sdev_state != SDEV_OFFLINE &&
570 sdev->sdev_state != SDEV_CANCEL && sdev->sdev_state != SDEV_DEL &&
571 !(dev->flags & ATA_DFLAG_SUSPENDED))
572 rc = -EIO;
573
574 out_unlock:
575 spin_unlock_irqrestore(ap->lock, flags);
576 out:
577 if (rc == 0)
3c5100c1 578 sdev->sdev_gendev.power.power_state = mesg;
d6f26d1f 579 return rc;
9b847548
JA		 580}
581
d6f26d1f
TH		 582/**
583 * ata_scsi_device_resume - resume ATA device associated with sdev
584 * @sdev: the SCSI device to resume
585 *
586 * Request resume EH action on the ATA device associated with
587 * @sdev and return immediately. This enables parallel
588 * wakeup/spinup of devices.
589 *
590 * LOCKING:
591 * Kernel thread context (may sleep).
592 *
593 * RETURNS:
594 * 0.
595 */
596int ata_scsi_device_resume(struct scsi_device *sdev)
9b847548 597{
35bb94b1 598 struct ata_port *ap = ata_shost_to_port(sdev->host);
d6f26d1f
TH		 599 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
600 struct ata_eh_info *ehi = &ap->eh_info;
601 unsigned long flags;
602 unsigned int action;
603
604 if (!dev)
605 goto out;
606
607 spin_lock_irqsave(ap->lock, flags);
608
609 /* if @sdev is already detached, nothing to do */
610 if (sdev->sdev_state == SDEV_OFFLINE ||
611 sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
612 goto out_unlock;
613
614 /* request resume */
615 action = ATA_EH_RESUME;
616 if (sdev->sdev_gendev.power.power_state.event == PM_EVENT_SUSPEND)
617 __ata_ehi_hotplugged(ehi);
618 else
619 action |= ATA_EH_PM_FREEZE | ATA_EH_SOFTRESET;
620 ehi->dev_action[dev->devno] |= action;
621
622 /* We don't want autopsy and verbose EH messages. Disable
623 * those if we're the only device on this link.
624 */
625 if (ata_port_max_devices(ap) == 1)
626 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
627
628 ata_port_schedule_eh(ap);
629
630 out_unlock:
631 spin_unlock_irqrestore(ap->lock, flags);
632 out:
633 sdev->sdev_gendev.power.power_state = PMSG_ON;
634 return 0;
9b847548
JA		 635}
636
1da177e4
LT		 637/**
638 * ata_to_sense_error - convert ATA error to SCSI error
8e8b77dd 639 * @id: ATA device number
1da177e4 640 * @drv_stat: value contained in ATA status register
b095518e
JG		 641 * @drv_err: value contained in ATA error register
642 * @sk: the sense key we'll fill out
643 * @asc: the additional sense code we'll fill out
644 * @ascq: the additional sense code qualifier we'll fill out
246619da 645 * @verbose: be verbose
1da177e4 646 *
b095518e
JG		 647 * Converts an ATA error into a SCSI error. Fill out pointers to
648 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
649 * format sense blocks.
1da177e4
LT		 650 *
651 * LOCKING:
cca3974e 652 * spin_lock_irqsave(host lock)
1da177e4 653 */
7102d230
AB		 654static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
655 u8 *asc, u8 *ascq, int verbose)
1da177e4 656{
b095518e 657 int i;
ffe75ef6 658
1da177e4 659 /* Based on the 3ware driver translation table */
98ac62de 660 static const unsigned char sense_table[][4] = {
1da177e4
LT		 661 /* BBD|ECC|ID|MAR */
662 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
663 /* BBD|ECC|ID */
664 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
665 /* ECC|MC|MARK */
666 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
667 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
668 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
669 /* MC|ID|ABRT|TRK0|MARK */
670 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
671 /* MCR|MARK */
672 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
673 /* Bad address mark */
674 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
675 /* TRK0 */
676 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
677 /* Abort & !ICRC */
678 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
679 /* Media change request */
680 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
681 /* SRV */
682 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
683 /* Media change */
684 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
685 /* ECC */
686 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
687 /* BBD - block marked bad */
688 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
689 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
690 };
98ac62de 691 static const unsigned char stat_table[][4] = {
1da177e4
LT		 692 /* Must be first because BUSY means no other bits valid */
693 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
694 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
695 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
696 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
697 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
698 };
1da177e4 699
1da177e4
LT		 700 /*
701 * Is this an error we can process/parse
702 */
b095518e
JG		 703 if (drv_stat & ATA_BUSY) {
704 drv_err = 0; /* Ignore the err bits, they're invalid */
1da177e4 705 }
b095518e
JG		 706
707 if (drv_err) {
708 /* Look for drv_err */
709 for (i = 0; sense_table[i][0] != 0xFF; i++) {
710 /* Look for best matches first */
2e9edbf8 711 if ((sense_table[i][0] & drv_err) ==
b095518e
JG		 712 sense_table[i][0]) {
713 *sk = sense_table[i][1];
714 *asc = sense_table[i][2];
715 *ascq = sense_table[i][3];
716 goto translate_done;
717 }
718 }
719 /* No immediate match */
246619da
TH		 720 if (verbose)
721 printk(KERN_WARNING "ata%u: no sense translation for "
722 "error 0x%02x\n", id, drv_err);
1da177e4 723 }
b095518e
JG		 724
725 /* Fall back to interpreting status bits */
726 for (i = 0; stat_table[i][0] != 0xFF; i++) {
727 if (stat_table[i][0] & drv_stat) {
728 *sk = stat_table[i][1];
729 *asc = stat_table[i][2];
730 *ascq = stat_table[i][3];
731 goto translate_done;
1da177e4 732 }
b095518e
JG		 733 }
734 /* No error? Undecoded? */
246619da
TH		 735 if (verbose)
736 printk(KERN_WARNING "ata%u: no sense translation for "
737 "status: 0x%02x\n", id, drv_stat);
b095518e 738
2d202024
AC		 739 /* We need a sensible error return here, which is tricky, and one
740 that won't cause people to do things like return a disk wrongly */
741 *sk = ABORTED_COMMAND;
742 *asc = 0x00;
743 *ascq = 0x00;
b095518e
JG		 744
745 translate_done:
246619da
TH		 746 if (verbose)
747 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
748 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
749 id, drv_stat, drv_err, *sk, *asc, *ascq);
b095518e
JG		 750 return;
751}
752
753/*
750426aa 754 * ata_gen_passthru_sense - Generate check condition sense block.
b095518e
JG		 755 * @qc: Command that completed.
756 *
757 * This function is specific to the ATA descriptor format sense
758 * block specified for the ATA pass through commands. Regardless
759 * of whether the command errored or not, return a sense
760 * block. Copy all controller registers into the sense
761 * block. Clear sense key, ASC & ASCQ if there is no error.
762 *
763 * LOCKING:
750426aa 764 * None.
b095518e 765 */
750426aa 766static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
b095518e
JG		 767{
768 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 769 struct ata_taskfile *tf = &qc->result_tf;
b095518e
JG		 770 unsigned char *sb = cmd->sense_buffer;
771 unsigned char *desc = sb + 8;
246619da 772 int verbose = qc->ap->ops->error_handler == NULL;
b095518e
JG		 773
774 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
775
0e5dec47 776 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 777
b095518e
JG		 778 /*
779 * Use ata_to_sense_error() to map status register bits
780 * onto sense key, asc & ascq.
781 */
058e55e1
TH		 782 if (qc->err_mask ||
783 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
b095518e 784 ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
246619da 785 &sb[1], &sb[2], &sb[3], verbose);
b095518e 786 sb[1] &= 0x0f;
1da177e4
LT		 787 }
788
b095518e
JG		 789 /*
790 * Sense data is current and format is descriptor.
791 */
792 sb[0] = 0x72;
1da177e4 793
b095518e
JG		 794 desc[0] = 0x09;
795
f38621b3
TH		 796 /* set length of additional sense data */
797 sb[7] = 14;
798 desc[1] = 12;
b095518e
JG		 799
800 /*
801 * Copy registers into sense buffer.
802 */
803 desc[2] = 0x00;
804 desc[3] = tf->feature; /* == error reg */
805 desc[5] = tf->nsect;
806 desc[7] = tf->lbal;
807 desc[9] = tf->lbam;
808 desc[11] = tf->lbah;
809 desc[12] = tf->device;
810 desc[13] = tf->command; /* == status reg */
811
812 /*
813 * Fill in Extend bit, and the high order bytes
814 * if applicable.
815 */
816 if (tf->flags & ATA_TFLAG_LBA48) {
817 desc[2] |= 0x01;
818 desc[4] = tf->hob_nsect;
819 desc[6] = tf->hob_lbal;
820 desc[8] = tf->hob_lbam;
821 desc[10] = tf->hob_lbah;
1da177e4 822 }
b095518e 823}
1da177e4 824
b095518e 825/**
750426aa 826 * ata_gen_ata_sense - generate a SCSI fixed sense block
b095518e
JG		 827 * @qc: Command that we are erroring out
828 *
d25614ba
TH		 829 * Generate sense block for a failed ATA command @qc. Descriptor
830 * format is used to accomodate LBA48 block address.
b095518e
JG		 831 *
832 * LOCKING:
750426aa 833 * None.
b095518e 834 */
750426aa 835static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
b095518e 836{
d25614ba 837 struct ata_device *dev = qc->dev;
b095518e 838 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 839 struct ata_taskfile *tf = &qc->result_tf;
b095518e 840 unsigned char *sb = cmd->sense_buffer;
d25614ba 841 unsigned char *desc = sb + 8;
246619da 842 int verbose = qc->ap->ops->error_handler == NULL;
d25614ba 843 u64 block;
b095518e
JG		 844
845 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
846
0e5dec47 847 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 848
d25614ba
TH		 849 /* sense data is current and format is descriptor */
850 sb[0] = 0x72;
851
852 /* Use ata_to_sense_error() to map status register bits
b095518e
JG		 853 * onto sense key, asc & ascq.
854 */
058e55e1
TH		 855 if (qc->err_mask ||
856 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
b095518e 857 ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
d25614ba
TH		 858 &sb[1], &sb[2], &sb[3], verbose);
859 sb[1] &= 0x0f;
1da177e4 860 }
1da177e4 861
d25614ba 862 block = ata_tf_read_block(&qc->result_tf, dev);
a7dac447 863
d25614ba
TH		 864 /* information sense data descriptor */
865 sb[7] = 12;
866 desc[0] = 0x00;
867 desc[1] = 10;
a7dac447 868
d25614ba
TH		 869 desc[2] |= 0x80; /* valid */
870 desc[6] = block >> 40;
871 desc[7] = block >> 32;
872 desc[8] = block >> 24;
873 desc[9] = block >> 16;
874 desc[10] = block >> 8;
875 desc[11] = block;
1da177e4
LT		 876}
877
a6cce2a7
BK		 878static void ata_scsi_sdev_config(struct scsi_device *sdev)
879{
880 sdev->use_10_for_rw = 1;
881 sdev->use_10_for_ms = 1;
882}
883
884static void ata_scsi_dev_config(struct scsi_device *sdev,
885 struct ata_device *dev)
886{
914ed354
TH		 887 /* configure max sectors */
888 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);
a6cce2a7 889
914ed354 890 /* SATA DMA transfers must be multiples of 4 byte, so
a6cce2a7
BK		 891 * we need to pad ATAPI transfers using an extra sg.
892 * Decrement max hw segments accordingly.
893 */
894 if (dev->class == ATA_DEV_ATAPI) {
895 request_queue_t *q = sdev->request_queue;
896 blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
897 }
a6e6ce8e
TH		 898
899 if (dev->flags & ATA_DFLAG_NCQ) {
900 int depth;
901
902 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
903 depth = min(ATA_MAX_QUEUE - 1, depth);
904 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
905 }
a6cce2a7
BK		 906}
907
1da177e4
LT		 908/**
909 * ata_scsi_slave_config - Set SCSI device attributes
910 * @sdev: SCSI device to examine
911 *
912 * This is called before we actually start reading
913 * and writing to the device, to configure certain
914 * SCSI mid-layer behaviors.
915 *
916 * LOCKING:
917 * Defined by SCSI layer. We don't really care.
918 */
919
920int ata_scsi_slave_config(struct scsi_device *sdev)
921{
31534363
TH		 922 struct ata_port *ap = ata_shost_to_port(sdev->host);
923 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
924
a6cce2a7 925 ata_scsi_sdev_config(sdev);
1da177e4
LT		 926
927 blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);
928
31534363 929 if (dev)
a6cce2a7 930 ata_scsi_dev_config(sdev, dev);
1da177e4
LT		 931
932 return 0; /* scsi layer doesn't check return value, sigh */
933}
934
83c47bcb
TH		 935/**
936 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
937 * @sdev: SCSI device to be destroyed
938 *
939 * @sdev is about to be destroyed for hot/warm unplugging. If
940 * this unplugging was initiated by libata as indicated by NULL
941 * dev->sdev, this function doesn't have to do anything.
942 * Otherwise, SCSI layer initiated warm-unplug is in progress.
943 * Clear dev->sdev, schedule the device for ATA detach and invoke
944 * EH.
945 *
946 * LOCKING:
947 * Defined by SCSI layer. We don't really care.
948 */
949void ata_scsi_slave_destroy(struct scsi_device *sdev)
950{
951 struct ata_port *ap = ata_shost_to_port(sdev->host);
952 unsigned long flags;
953 struct ata_device *dev;
954
955 if (!ap->ops->error_handler)
956 return;
957
ba6a1308 958 spin_lock_irqsave(ap->lock, flags);
83c47bcb
TH		 959 dev = __ata_scsi_find_dev(ap, sdev);
960 if (dev && dev->sdev) {
961 /* SCSI device already in CANCEL state, no need to offline it */
962 dev->sdev = NULL;
963 dev->flags |= ATA_DFLAG_DETACH;
964 ata_port_schedule_eh(ap);
965 }
ba6a1308 966 spin_unlock_irqrestore(ap->lock, flags);
83c47bcb
TH		 967}
968
a6e6ce8e
TH		 969/**
970 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
971 * @sdev: SCSI device to configure queue depth for
972 * @queue_depth: new queue depth
973 *
974 * This is libata standard hostt->change_queue_depth callback.
975 * SCSI will call into this callback when user tries to set queue
976 * depth via sysfs.
977 *
978 * LOCKING:
979 * SCSI layer (we don't care)
980 *
981 * RETURNS:
982 * Newly configured queue depth.
983 */
984int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
985{
986 struct ata_port *ap = ata_shost_to_port(sdev->host);
987 struct ata_device *dev;
360f654e 988 unsigned long flags;
a6e6ce8e
TH		 989 int max_depth;
990
991 if (queue_depth < 1)
992 return sdev->queue_depth;
993
994 dev = ata_scsi_find_dev(ap, sdev);
995 if (!dev || !ata_dev_enabled(dev))
996 return sdev->queue_depth;
997
998 max_depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
999 max_depth = min(ATA_MAX_QUEUE - 1, max_depth);
1000 if (queue_depth > max_depth)
1001 queue_depth = max_depth;
1002
1003 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
360f654e
TH		 1004
1005 spin_lock_irqsave(ap->lock, flags);
1006 if (queue_depth > 1)
1007 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1008 else
1009 dev->flags |= ATA_DFLAG_NCQ_OFF;
1010 spin_unlock_irqrestore(ap->lock, flags);
1011
a6e6ce8e
TH		 1012 return queue_depth;
1013}
1014
972dcafb
DG		 1015/**
1016 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1017 * @qc: Storage for translated ATA taskfile
972dcafb
DG		 1018 *
1019 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1020 * (to start). Perhaps these commands should be preceded by
1021 * CHECK POWER MODE to see what power mode the device is already in.
1022 * [See SAT revision 5 at www.t10.org]
1023 *
1024 * LOCKING:
cca3974e 1025 * spin_lock_irqsave(host lock)
972dcafb
DG		 1026 *
1027 * RETURNS:
1028 * Zero on success, non-zero on error.
1029 */
ad706991 1030static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
972dcafb 1031{
542b1444 1032 struct scsi_cmnd *scmd = qc->scsicmd;
972dcafb 1033 struct ata_taskfile *tf = &qc->tf;
ad706991 1034 const u8 *cdb = scmd->cmnd;
972dcafb 1035
2e5704f6
TH		 1036 if (scmd->cmd_len < 5)
1037 goto invalid_fld;
1038
972dcafb
DG		 1039 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1040 tf->protocol = ATA_PROT_NODATA;
542b1444 1041 if (cdb[1] & 0x1) {
972dcafb
DG		 1042 ; /* ignore IMMED bit, violates sat-r05 */
1043 }
542b1444 1044 if (cdb[4] & 0x2)
ae006510 1045 goto invalid_fld; /* LOEJ bit set not supported */
542b1444 1046 if (((cdb[4] >> 4) & 0xf) != 0)
ae006510 1047 goto invalid_fld; /* power conditions not supported */
542b1444 1048 if (cdb[4] & 0x1) {
972dcafb 1049 tf->nsect = 1; /* 1 sector, lba=0 */
9d5b1302
AL		 1050
1051 if (qc->dev->flags & ATA_DFLAG_LBA) {
c44078c0 1052 tf->flags |= ATA_TFLAG_LBA;
9d5b1302
AL		 1053
1054 tf->lbah = 0x0;
1055 tf->lbam = 0x0;
1056 tf->lbal = 0x0;
1057 tf->device |= ATA_LBA;
1058 } else {
1059 /* CHS */
1060 tf->lbal = 0x1; /* sect */
1061 tf->lbam = 0x0; /* cyl low */
1062 tf->lbah = 0x0; /* cyl high */
1063 }
1064
972dcafb 1065 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
78981a7c
RH		 1066 } else
1067 /* Issue ATA STANDBY IMMEDIATE command */
1068 tf->command = ATA_CMD_STANDBYNOW1;
1069
972dcafb
DG		 1070 /*
1071 * Standby and Idle condition timers could be implemented but that
1072 * would require libata to implement the Power condition mode page
1073 * and allow the user to change it. Changing mode pages requires
1074 * MODE SELECT to be implemented.
1075 */
1076
1077 return 0;
ae006510
DG		 1078
1079invalid_fld:
542b1444 1080 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1081 /* "Invalid field in cbd" */
1082 return 1;
972dcafb
DG		 1083}
1084
1085
1da177e4
LT		 1086/**
1087 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1088 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1089 *
1090 * Sets up an ATA taskfile to issue FLUSH CACHE or
1091 * FLUSH CACHE EXT.
1092 *
1093 * LOCKING:
cca3974e 1094 * spin_lock_irqsave(host lock)
1da177e4
LT		 1095 *
1096 * RETURNS:
1097 * Zero on success, non-zero on error.
1098 */
ad706991 1099static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1da177e4
LT		 1100{
1101 struct ata_taskfile *tf = &qc->tf;
1102
1103 tf->flags |= ATA_TFLAG_DEVICE;
1104 tf->protocol = ATA_PROT_NODATA;
1105
6fc49adb 1106 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1da177e4
LT		 1107 tf->command = ATA_CMD_FLUSH_EXT;
1108 else
1109 tf->command = ATA_CMD_FLUSH;
1110
1111 return 0;
1112}
1113
3aef5231
AL		 1114/**
1115 * scsi_6_lba_len - Get LBA and transfer length
542b1444 1116 * @cdb: SCSI command to translate
3aef5231
AL		 1117 *
1118 * Calculate LBA and transfer length for 6-byte commands.
1119 *
1120 * RETURNS:
1121 * @plba: the LBA
1122 * @plen: the transfer length
1123 */
542b1444 1124static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1125{
1126 u64 lba = 0;
1127 u32 len = 0;
1128
1129 VPRINTK("six-byte command\n");
1130
542b1444
TH		 1131 lba |= ((u64)cdb[2]) << 8;
1132 lba |= ((u64)cdb[3]);
3aef5231 1133
542b1444 1134 len |= ((u32)cdb[4]);
3aef5231
AL		 1135
1136 *plba = lba;
1137 *plen = len;
1138}
1139
1140/**
1141 * scsi_10_lba_len - Get LBA and transfer length
542b1444 1142 * @cdb: SCSI command to translate
3aef5231
AL		 1143 *
1144 * Calculate LBA and transfer length for 10-byte commands.
1145 *
1146 * RETURNS:
1147 * @plba: the LBA
1148 * @plen: the transfer length
1149 */
542b1444 1150static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1151{
1152 u64 lba = 0;
1153 u32 len = 0;
1154
1155 VPRINTK("ten-byte command\n");
1156
542b1444
TH		 1157 lba |= ((u64)cdb[2]) << 24;
1158 lba |= ((u64)cdb[3]) << 16;
1159 lba |= ((u64)cdb[4]) << 8;
1160 lba |= ((u64)cdb[5]);
3aef5231 1161
542b1444
TH		 1162 len |= ((u32)cdb[7]) << 8;
1163 len |= ((u32)cdb[8]);
3aef5231
AL		 1164
1165 *plba = lba;
1166 *plen = len;
1167}
1168
1169/**
1170 * scsi_16_lba_len - Get LBA and transfer length
542b1444 1171 * @cdb: SCSI command to translate
3aef5231
AL		 1172 *
1173 * Calculate LBA and transfer length for 16-byte commands.
1174 *
1175 * RETURNS:
1176 * @plba: the LBA
1177 * @plen: the transfer length
1178 */
542b1444 1179static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1180{
1181 u64 lba = 0;
1182 u32 len = 0;
1183
1184 VPRINTK("sixteen-byte command\n");
1185
542b1444
TH		 1186 lba |= ((u64)cdb[2]) << 56;
1187 lba |= ((u64)cdb[3]) << 48;
1188 lba |= ((u64)cdb[4]) << 40;
1189 lba |= ((u64)cdb[5]) << 32;
1190 lba |= ((u64)cdb[6]) << 24;
1191 lba |= ((u64)cdb[7]) << 16;
1192 lba |= ((u64)cdb[8]) << 8;
1193 lba |= ((u64)cdb[9]);
3aef5231 1194
542b1444
TH		 1195 len |= ((u32)cdb[10]) << 24;
1196 len |= ((u32)cdb[11]) << 16;
1197 len |= ((u32)cdb[12]) << 8;
1198 len |= ((u32)cdb[13]);
3aef5231
AL		 1199
1200 *plba = lba;
1201 *plen = len;
1202}
1203
1da177e4
LT		 1204/**
1205 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1206 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1207 *
1208 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1209 *
1210 * LOCKING:
cca3974e 1211 * spin_lock_irqsave(host lock)
1da177e4
LT		 1212 *
1213 * RETURNS:
1214 * Zero on success, non-zero on error.
1215 */
ad706991 1216static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1da177e4 1217{
542b1444 1218 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4 1219 struct ata_taskfile *tf = &qc->tf;
8bf62ece 1220 struct ata_device *dev = qc->dev;
1da177e4 1221 u64 dev_sectors = qc->dev->n_sectors;
ad706991 1222 const u8 *cdb = scmd->cmnd;
3aef5231
AL		 1223 u64 block;
1224 u32 n_block;
1da177e4
LT		 1225
1226 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1227 tf->protocol = ATA_PROT_NODATA;
1da177e4 1228
2e5704f6
TH		 1229 if (cdb[0] == VERIFY) {
1230 if (scmd->cmd_len < 10)
1231 goto invalid_fld;
542b1444 1232 scsi_10_lba_len(cdb, &block, &n_block);
2e5704f6
TH		 1233 } else if (cdb[0] == VERIFY_16) {
1234 if (scmd->cmd_len < 16)
1235 goto invalid_fld;
542b1444 1236 scsi_16_lba_len(cdb, &block, &n_block);
2e5704f6 1237 } else
ae006510 1238 goto invalid_fld;
1da177e4 1239
8bf62ece 1240 if (!n_block)
ae006510 1241 goto nothing_to_do;
8bf62ece 1242 if (block >= dev_sectors)
ae006510 1243 goto out_of_range;
8bf62ece 1244 if ((block + n_block) > dev_sectors)
ae006510 1245 goto out_of_range;
1da177e4 1246
07506697
AL		 1247 if (dev->flags & ATA_DFLAG_LBA) {
1248 tf->flags |= ATA_TFLAG_LBA;
1249
c6a33e24
AL		 1250 if (lba_28_ok(block, n_block)) {
1251 /* use LBA28 */
1252 tf->command = ATA_CMD_VERIFY;
1253 tf->device |= (block >> 24) & 0xf;
1254 } else if (lba_48_ok(block, n_block)) {
1255 if (!(dev->flags & ATA_DFLAG_LBA48))
1256 goto out_of_range;
07506697
AL		 1257
1258 /* use LBA48 */
1259 tf->flags |= ATA_TFLAG_LBA48;
8bf62ece 1260 tf->command = ATA_CMD_VERIFY_EXT;
1da177e4 1261
8bf62ece 1262 tf->hob_nsect = (n_block >> 8) & 0xff;
1da177e4 1263
8bf62ece
AL		 1264 tf->hob_lbah = (block >> 40) & 0xff;
1265 tf->hob_lbam = (block >> 32) & 0xff;
1266 tf->hob_lbal = (block >> 24) & 0xff;
c6a33e24
AL		 1267 } else
1268 /* request too large even for LBA48 */
1269 goto out_of_range;
8bf62ece
AL		 1270
1271 tf->nsect = n_block & 0xff;
1da177e4 1272
8bf62ece
AL		 1273 tf->lbah = (block >> 16) & 0xff;
1274 tf->lbam = (block >> 8) & 0xff;
1275 tf->lbal = block & 0xff;
1da177e4 1276
8bf62ece
AL		 1277 tf->device |= ATA_LBA;
1278 } else {
1279 /* CHS */
1280 u32 sect, head, cyl, track;
1281
c6a33e24
AL		 1282 if (!lba_28_ok(block, n_block))
1283 goto out_of_range;
07506697 1284
8bf62ece
AL		 1285 /* Convert LBA to CHS */
1286 track = (u32)block / dev->sectors;
1287 cyl = track / dev->heads;
1288 head = track % dev->heads;
1289 sect = (u32)block % dev->sectors + 1;
1290
c187c4b5
AL		 1291 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1292 (u32)block, track, cyl, head, sect);
2e9edbf8
JG		 1293
1294 /* Check whether the converted CHS can fit.
1295 Cylinder: 0-65535
8bf62ece
AL		 1296 Head: 0-15
1297 Sector: 1-255*/
2e9edbf8 1298 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
ae006510 1299 goto out_of_range;
2e9edbf8 1300
8bf62ece
AL		 1301 tf->command = ATA_CMD_VERIFY;
1302 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1303 tf->lbal = sect;
1304 tf->lbam = cyl;
1305 tf->lbah = cyl >> 8;
1306 tf->device |= head;
1307 }
1da177e4
LT		 1308
1309 return 0;
ae006510
DG		 1310
1311invalid_fld:
542b1444 1312 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1313 /* "Invalid field in cbd" */
1314 return 1;
1315
1316out_of_range:
542b1444 1317 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1318 /* "Logical Block Address out of range" */
1319 return 1;
1320
1321nothing_to_do:
542b1444 1322 scmd->result = SAM_STAT_GOOD;
ae006510 1323 return 1;
1da177e4
LT		 1324}
1325
1326/**
1327 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1328 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1329 *
1330 * Converts any of six SCSI read/write commands into the
1331 * ATA counterpart, including starting sector (LBA),
1332 * sector count, and taking into account the device's LBA48
1333 * support.
1334 *
1335 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1336 * %WRITE_16 are currently supported.
1337 *
1338 * LOCKING:
cca3974e 1339 * spin_lock_irqsave(host lock)
1da177e4
LT		 1340 *
1341 * RETURNS:
1342 * Zero on success, non-zero on error.
1343 */
ad706991 1344static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1da177e4 1345{
542b1444 1346 struct scsi_cmnd *scmd = qc->scsicmd;
ad706991 1347 const u8 *cdb = scmd->cmnd;
bd056d7e 1348 unsigned int tf_flags = 0;
3aef5231
AL		 1349 u64 block;
1350 u32 n_block;
bd056d7e 1351 int rc;
1da177e4 1352
542b1444 1353 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
bd056d7e 1354 tf_flags |= ATA_TFLAG_WRITE;
1da177e4 1355
9a3dccc4 1356 /* Calculate the SCSI LBA, transfer length and FUA. */
542b1444 1357 switch (cdb[0]) {
3aef5231
AL		 1358 case READ_10:
1359 case WRITE_10:
2e5704f6
TH		 1360 if (unlikely(scmd->cmd_len < 10))
1361 goto invalid_fld;
542b1444
TH		 1362 scsi_10_lba_len(cdb, &block, &n_block);
1363 if (unlikely(cdb[1] & (1 << 3)))
bd056d7e 1364 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1365 break;
1366 case READ_6:
1367 case WRITE_6:
2e5704f6
TH		 1368 if (unlikely(scmd->cmd_len < 6))
1369 goto invalid_fld;
542b1444 1370 scsi_6_lba_len(cdb, &block, &n_block);
c187c4b5
AL		 1371
1372 /* for 6-byte r/w commands, transfer length 0
1373 * means 256 blocks of data, not 0 block.
1374 */
76b2bf9b
JG		 1375 if (!n_block)
1376 n_block = 256;
3aef5231
AL		 1377 break;
1378 case READ_16:
1379 case WRITE_16:
2e5704f6
TH		 1380 if (unlikely(scmd->cmd_len < 16))
1381 goto invalid_fld;
542b1444
TH		 1382 scsi_16_lba_len(cdb, &block, &n_block);
1383 if (unlikely(cdb[1] & (1 << 3)))
bd056d7e 1384 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1385 break;
1386 default:
8bf62ece 1387 DPRINTK("no-byte command\n");
ae006510 1388 goto invalid_fld;
1da177e4
LT		 1389 }
1390
8bf62ece
AL		 1391 /* Check and compose ATA command */
1392 if (!n_block)
c187c4b5
AL		 1393 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1394 * length 0 means transfer 0 block of data.
1395 * However, for ATA R/W commands, sector count 0 means
1396 * 256 or 65536 sectors, not 0 sectors as in SCSI.
f51750d5
AC		 1397 *
1398 * WARNING: one or two older ATA drives treat 0 as 0...
c187c4b5 1399 */
ae006510 1400 goto nothing_to_do;
1da177e4 1401
bd056d7e 1402 qc->flags |= ATA_QCFLAG_IO;
726f0785 1403 qc->nbytes = n_block * ATA_SECT_SIZE;
1da177e4 1404
bd056d7e
TH		 1405 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1406 qc->tag);
1407 if (likely(rc == 0))
1408 return 0;
ae006510 1409
bd056d7e
TH		 1410 if (rc == -ERANGE)
1411 goto out_of_range;
1412 /* treat all other errors as -EINVAL, fall through */
ae006510 1413invalid_fld:
542b1444 1414 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1415 /* "Invalid field in cbd" */
1416 return 1;
1417
1418out_of_range:
542b1444 1419 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1420 /* "Logical Block Address out of range" */
1421 return 1;
1422
1423nothing_to_do:
542b1444 1424 scmd->result = SAM_STAT_GOOD;
ae006510 1425 return 1;
1da177e4
LT		 1426}
1427
77853bf2 1428static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1da177e4 1429{
c31f571d 1430 struct ata_port *ap = qc->ap;
1da177e4 1431 struct scsi_cmnd *cmd = qc->scsicmd;
a7dac447 1432 u8 *cdb = cmd->cmnd;
a22e2eb0 1433 int need_sense = (qc->err_mask != 0);
b095518e 1434
3057ac3c 1435 /* We snoop the SET_FEATURES - Write Cache ON/OFF command, and
1436 * schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE
1437 * cache
1438 */
c31f571d
TH		 1439 if (ap->ops->error_handler &&
1440 !need_sense && (qc->tf.command == ATA_CMD_SET_FEATURES) &&
3057ac3c 1441 ((qc->tf.feature == SETFEATURES_WC_ON) ||
1442 (qc->tf.feature == SETFEATURES_WC_OFF))) {
c31f571d
TH		 1443 ap->eh_info.action |= ATA_EH_REVALIDATE;
1444 ata_port_schedule_eh(ap);
3057ac3c 1445 }
1446
b095518e
JG		 1447 /* For ATA pass thru (SAT) commands, generate a sense block if
1448 * user mandated it or if there's an error. Note that if we
1449 * generate because the user forced us to, a check condition
1450 * is generated and the ATA register values are returned
1451 * whether the command completed successfully or not. If there
1452 * was no error, SK, ASC and ASCQ will all be zero.
1453 */
a7dac447
JG		 1454 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1455 ((cdb[2] & 0x20) || need_sense)) {
750426aa 1456 ata_gen_passthru_sense(qc);
b095518e
JG		 1457 } else {
1458 if (!need_sense) {
1459 cmd->result = SAM_STAT_GOOD;
1460 } else {
1461 /* TODO: decide which descriptor format to use
1462 * for 48b LBA devices and call that here
1463 * instead of the fixed desc, which is only
1464 * good for smaller LBA (and maybe CHS?)
1465 * devices.
1466 */
750426aa 1467 ata_gen_ata_sense(qc);
b095518e
JG		 1468 }
1469 }
1da177e4 1470
c31f571d
TH		 1471 if (need_sense && !ap->ops->error_handler)
1472 ata_dump_status(ap->id, &qc->result_tf);
1da177e4
LT		 1473
1474 qc->scsidone(cmd);
1475
77853bf2 1476 ata_qc_free(qc);
1da177e4
LT		 1477}
1478
3dc1d881
TH		 1479/**
1480 * ata_scmd_need_defer - Check whether we need to defer scmd
1481 * @dev: ATA device to which the command is addressed
1482 * @is_io: Is the command IO (and thus possibly NCQ)?
1483 *
1484 * NCQ and non-NCQ commands cannot run together. As upper layer
1485 * only knows the queue depth, we are responsible for maintaining
1486 * exclusion. This function checks whether a new command can be
1487 * issued to @dev.
1488 *
1489 * LOCKING:
cca3974e 1490 * spin_lock_irqsave(host lock)
3dc1d881
TH		 1491 *
1492 * RETURNS:
1493 * 1 if deferring is needed, 0 otherwise.
1494 */
1495static int ata_scmd_need_defer(struct ata_device *dev, int is_io)
1496{
1497 struct ata_port *ap = dev->ap;
1498
1499 if (!(dev->flags & ATA_DFLAG_NCQ))
1500 return 0;
1501
1502 if (is_io) {
1503 if (!ata_tag_valid(ap->active_tag))
1504 return 0;
1505 } else {
1506 if (!ata_tag_valid(ap->active_tag) && !ap->sactive)
1507 return 0;
1508 }
1509 return 1;
1510}
1511
1da177e4
LT		 1512/**
1513 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1da177e4
LT		 1514 * @dev: ATA device to which the command is addressed
1515 * @cmd: SCSI command to execute
1516 * @done: SCSI command completion function
1517 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1518 *
1519 * Our ->queuecommand() function has decided that the SCSI
1520 * command issued can be directly translated into an ATA
1521 * command, rather than handled internally.
1522 *
1523 * This function sets up an ata_queued_cmd structure for the
1524 * SCSI command, and sends that ata_queued_cmd to the hardware.
1525 *
ae006510
DG		 1526 * The xlat_func argument (actor) returns 0 if ready to execute
1527 * ATA command, else 1 to finish translation. If 1 is returned
1528 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1529 * to be set reflecting an error condition or clean (early)
1530 * termination.
1531 *
1da177e4 1532 * LOCKING:
cca3974e 1533 * spin_lock_irqsave(host lock)
2115ea94
TH		 1534 *
1535 * RETURNS:
1536 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1537 * needs to be deferred.
1da177e4 1538 */
2115ea94
TH		 1539static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1540 void (*done)(struct scsi_cmnd *),
1541 ata_xlat_func_t xlat_func)
1da177e4
LT		 1542{
1543 struct ata_queued_cmd *qc;
3dc1d881 1544 int is_io = xlat_func == ata_scsi_rw_xlat;
1da177e4
LT		 1545
1546 VPRINTK("ENTER\n");
1547
3dc1d881
TH		 1548 if (unlikely(ata_scmd_need_defer(dev, is_io)))
1549 goto defer;
1550
3373efd8 1551 qc = ata_scsi_qc_new(dev, cmd, done);
1da177e4 1552 if (!qc)
ae006510 1553 goto err_mem;
1da177e4
LT		 1554
1555 /* data is present; dma-map it */
be7db055
CH		 1556 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1557 cmd->sc_data_direction == DMA_TO_DEVICE) {
1da177e4 1558 if (unlikely(cmd->request_bufflen < 1)) {
f15a1daf
TH		 1559 ata_dev_printk(dev, KERN_WARNING,
1560 "WARNING: zero len r/w req\n");
ae006510 1561 goto err_did;
1da177e4
LT		 1562 }
1563
1564 if (cmd->use_sg)
1565 ata_sg_init(qc, cmd->request_buffer, cmd->use_sg);
1566 else
1567 ata_sg_init_one(qc, cmd->request_buffer,
1568 cmd->request_bufflen);
1569
1570 qc->dma_dir = cmd->sc_data_direction;
1571 }
1572
1573 qc->complete_fn = ata_scsi_qc_complete;
1574
ad706991 1575 if (xlat_func(qc))
ae006510 1576 goto early_finish;
1da177e4
LT		 1577
1578 /* select device, send command to hardware */
8e0e694a 1579 ata_qc_issue(qc);
1da177e4
LT		 1580
1581 VPRINTK("EXIT\n");
2115ea94 1582 return 0;
1da177e4 1583
ae006510
DG		 1584early_finish:
1585 ata_qc_free(qc);
1586 done(cmd);
1587 DPRINTK("EXIT - early finish (good or error)\n");
2115ea94 1588 return 0;
ae006510
DG		 1589
1590err_did:
1da177e4 1591 ata_qc_free(qc);
ae006510
DG		 1592 cmd->result = (DID_ERROR << 16);
1593 done(cmd);
253b92ec 1594err_mem:
ae006510 1595 DPRINTK("EXIT - internal\n");
2115ea94 1596 return 0;
3dc1d881
TH		 1597
1598defer:
1599 DPRINTK("EXIT - defer\n");
1600 return SCSI_MLQUEUE_DEVICE_BUSY;
1da177e4
LT		 1601}
1602
1603/**
1604 * ata_scsi_rbuf_get - Map response buffer.
1605 * @cmd: SCSI command containing buffer to be mapped.
1606 * @buf_out: Pointer to mapped area.
1607 *
1608 * Maps buffer contained within SCSI command @cmd.
1609 *
1610 * LOCKING:
cca3974e 1611 * spin_lock_irqsave(host lock)
1da177e4
LT		 1612 *
1613 * RETURNS:
1614 * Length of response buffer.
1615 */
1616
1617static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
1618{
1619 u8 *buf;
1620 unsigned int buflen;
1621
1622 if (cmd->use_sg) {
1623 struct scatterlist *sg;
1624
1625 sg = (struct scatterlist *) cmd->request_buffer;
da02d2a1 1626 buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
1da177e4
LT		 1627 buflen = sg->length;
1628 } else {
1629 buf = cmd->request_buffer;
1630 buflen = cmd->request_bufflen;
1631 }
1632
1633 *buf_out = buf;
1634 return buflen;
1635}
1636
1637/**
1638 * ata_scsi_rbuf_put - Unmap response buffer.
1639 * @cmd: SCSI command containing buffer to be unmapped.
1640 * @buf: buffer to unmap
1641 *
1642 * Unmaps response buffer contained within @cmd.
1643 *
1644 * LOCKING:
cca3974e 1645 * spin_lock_irqsave(host lock)
1da177e4
LT		 1646 */
1647
1648static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
1649{
1650 if (cmd->use_sg) {
1651 struct scatterlist *sg;
1652
1653 sg = (struct scatterlist *) cmd->request_buffer;
da02d2a1 1654 kunmap_atomic(buf - sg->offset, KM_IRQ0);
1da177e4
LT		 1655 }
1656}
1657
1658/**
1659 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1660 * @args: device IDENTIFY data / SCSI command of interest.
1661 * @actor: Callback hook for desired SCSI command simulator
1662 *
1663 * Takes care of the hard work of simulating a SCSI command...
1664 * Mapping the response buffer, calling the command's handler,
1665 * and handling the handler's return value. This return value
1666 * indicates whether the handler wishes the SCSI command to be
ae006510
DG		 1667 * completed successfully (0), or not (in which case cmd->result
1668 * and sense buffer are assumed to be set).
1da177e4
LT		 1669 *
1670 * LOCKING:
cca3974e 1671 * spin_lock_irqsave(host lock)
1da177e4
LT		 1672 */
1673
1674void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1675 unsigned int (*actor) (struct ata_scsi_args *args,
1676 u8 *rbuf, unsigned int buflen))
1677{
1678 u8 *rbuf;
1679 unsigned int buflen, rc;
1680 struct scsi_cmnd *cmd = args->cmd;
1681
1682 buflen = ata_scsi_rbuf_get(cmd, &rbuf);
1683 memset(rbuf, 0, buflen);
1684 rc = actor(args, rbuf, buflen);
1685 ata_scsi_rbuf_put(cmd, rbuf);
1686
ae006510 1687 if (rc == 0)
1da177e4 1688 cmd->result = SAM_STAT_GOOD;
ae006510 1689 args->done(cmd);
1da177e4
LT		 1690}
1691
6a36261e
TH		 1692/**
1693 * ATA_SCSI_RBUF_SET - helper to set values in SCSI response buffer
1694 * @idx: byte index into SCSI response buffer
1695 * @val: value to set
1696 *
1697 * To be used by SCSI command simulator functions. This macros
1698 * expects two local variables, u8 *rbuf and unsigned int buflen,
1699 * are in scope.
1700 *
1701 * LOCKING:
1702 * None.
1703 */
1704#define ATA_SCSI_RBUF_SET(idx, val) do { \
1705 if ((idx) < buflen) rbuf[(idx)] = (u8)(val); \
1706 } while (0)
1707
1da177e4
LT		 1708/**
1709 * ata_scsiop_inq_std - Simulate INQUIRY command
1710 * @args: device IDENTIFY data / SCSI command of interest.
1711 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1712 * @buflen: Response buffer length.
1713 *
1714 * Returns standard device identification data associated
b142eb65 1715 * with non-VPD INQUIRY command output.
1da177e4
LT		 1716 *
1717 * LOCKING:
cca3974e 1718 * spin_lock_irqsave(host lock)
1da177e4
LT		 1719 */
1720
1721unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
1722 unsigned int buflen)
1723{
1724 u8 hdr[] = {
1725 TYPE_DISK,
1726 0,
1727 0x5, /* claim SPC-3 version compatibility */
1728 2,
1729 95 - 4
1730 };
1731
1732 /* set scsi removeable (RMB) bit per ata bit */
1733 if (ata_id_removeable(args->id))
1734 hdr[1] |= (1 << 7);
1735
1736 VPRINTK("ENTER\n");
1737
1738 memcpy(rbuf, hdr, sizeof(hdr));
1739
1740 if (buflen > 35) {
1741 memcpy(&rbuf[8], "ATA ", 8);
a0cf733b
TH		 1742 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1743 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1da177e4
LT		 1744 if (rbuf[32] == 0 || rbuf[32] == ' ')
1745 memcpy(&rbuf[32], "n/a ", 4);
1746 }
1747
1748 if (buflen > 63) {
1749 const u8 versions[] = {
1750 0x60, /* SAM-3 (no version claimed) */
1751
1752 0x03,
1753 0x20, /* SBC-2 (no version claimed) */
1754
1755 0x02,
1756 0x60 /* SPC-3 (no version claimed) */
1757 };
1758
1759 memcpy(rbuf + 59, versions, sizeof(versions));
1760 }
1761
1762 return 0;
1763}
1764
1765/**
b142eb65 1766 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1da177e4
LT		 1767 * @args: device IDENTIFY data / SCSI command of interest.
1768 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1769 * @buflen: Response buffer length.
1770 *
b142eb65 1771 * Returns list of inquiry VPD pages available.
1da177e4
LT		 1772 *
1773 * LOCKING:
cca3974e 1774 * spin_lock_irqsave(host lock)
1da177e4
LT		 1775 */
1776
1777unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
1778 unsigned int buflen)
1779{
1780 const u8 pages[] = {
1781 0x00, /* page 0x00, this page */
1782 0x80, /* page 0x80, unit serial no page */
1783 0x83 /* page 0x83, device ident page */
1784 };
b142eb65 1785 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
1da177e4
LT		 1786
1787 if (buflen > 6)
1788 memcpy(rbuf + 4, pages, sizeof(pages));
1789
1790 return 0;
1791}
1792
1793/**
b142eb65 1794 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1da177e4
LT		 1795 * @args: device IDENTIFY data / SCSI command of interest.
1796 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1797 * @buflen: Response buffer length.
1798 *
1799 * Returns ATA device serial number.
1800 *
1801 * LOCKING:
cca3974e 1802 * spin_lock_irqsave(host lock)
1da177e4
LT		 1803 */
1804
1805unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
1806 unsigned int buflen)
1807{
1808 const u8 hdr[] = {
1809 0,
1810 0x80, /* this page code */
1811 0,
a0cf733b 1812 ATA_ID_SERNO_LEN, /* page len */
1da177e4
LT		 1813 };
1814 memcpy(rbuf, hdr, sizeof(hdr));
1815
a0cf733b 1816 if (buflen > (ATA_ID_SERNO_LEN + 4 - 1))
6a62a04d 1817 ata_id_string(args->id, (unsigned char *) &rbuf[4],
a0cf733b 1818 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1da177e4
LT		 1819
1820 return 0;
1821}
1822
1da177e4 1823/**
b142eb65 1824 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1da177e4
LT		 1825 * @args: device IDENTIFY data / SCSI command of interest.
1826 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1827 * @buflen: Response buffer length.
1828 *
b142eb65
JG		 1829 * Yields two logical unit device identification designators:
1830 * - vendor specific ASCII containing the ATA serial number
1831 * - SAT defined "t10 vendor id based" containing ASCII vendor
1832 * name ("ATA "), model and serial numbers.
1da177e4
LT		 1833 *
1834 * LOCKING:
cca3974e 1835 * spin_lock_irqsave(host lock)
1da177e4
LT		 1836 */
1837
1838unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
1839 unsigned int buflen)
1840{
b142eb65
JG		 1841 int num;
1842 const int sat_model_serial_desc_len = 68;
1da177e4 1843
b142eb65
JG		 1844 rbuf[1] = 0x83; /* this page code */
1845 num = 4;
1846
a0cf733b 1847 if (buflen > (ATA_ID_SERNO_LEN + num + 3)) {
b142eb65 1848 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2e9edbf8 1849 rbuf[num + 0] = 2;
a0cf733b 1850 rbuf[num + 3] = ATA_ID_SERNO_LEN;
b142eb65
JG		 1851 num += 4;
1852 ata_id_string(args->id, (unsigned char *) rbuf + num,
a0cf733b
TH		 1853 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1854 num += ATA_ID_SERNO_LEN;
1da177e4 1855 }
b142eb65
JG		 1856 if (buflen > (sat_model_serial_desc_len + num + 3)) {
1857 /* SAT defined lu model and serial numbers descriptor */
1858 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2e9edbf8
JG		 1859 rbuf[num + 0] = 2;
1860 rbuf[num + 1] = 1;
b142eb65
JG		 1861 rbuf[num + 3] = sat_model_serial_desc_len;
1862 num += 4;
1863 memcpy(rbuf + num, "ATA ", 8);
1864 num += 8;
1865 ata_id_string(args->id, (unsigned char *) rbuf + num,
a0cf733b
TH		 1866 ATA_ID_PROD, ATA_ID_PROD_LEN);
1867 num += ATA_ID_PROD_LEN;
b142eb65 1868 ata_id_string(args->id, (unsigned char *) rbuf + num,
a0cf733b
TH		 1869 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1870 num += ATA_ID_SERNO_LEN;
b142eb65
JG		 1871 }
1872 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
1da177e4
LT		 1873 return 0;
1874}
1875
1876/**
0cba632b 1877 * ata_scsiop_noop - Command handler that simply returns success.
1da177e4
LT		 1878 * @args: device IDENTIFY data / SCSI command of interest.
1879 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1880 * @buflen: Response buffer length.
1881 *
1882 * No operation. Simply returns success to caller, to indicate
1883 * that the caller should successfully complete this SCSI command.
1884 *
1885 * LOCKING:
cca3974e 1886 * spin_lock_irqsave(host lock)
1da177e4
LT		 1887 */
1888
1889unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
1890 unsigned int buflen)
1891{
1892 VPRINTK("ENTER\n");
1893 return 0;
1894}
1895
1896/**
1897 * ata_msense_push - Push data onto MODE SENSE data output buffer
1898 * @ptr_io: (input/output) Location to store more output data
1899 * @last: End of output data buffer
1900 * @buf: Pointer to BLOB being added to output buffer
1901 * @buflen: Length of BLOB
1902 *
1903 * Store MODE SENSE data on an output buffer.
1904 *
1905 * LOCKING:
1906 * None.
1907 */
1908
1909static void ata_msense_push(u8 **ptr_io, const u8 *last,
1910 const u8 *buf, unsigned int buflen)
1911{
1912 u8 *ptr = *ptr_io;
1913
1914 if ((ptr + buflen - 1) > last)
1915 return;
1916
1917 memcpy(ptr, buf, buflen);
1918
1919 ptr += buflen;
1920
1921 *ptr_io = ptr;
1922}
1923
1924/**
1925 * ata_msense_caching - Simulate MODE SENSE caching info page
1926 * @id: device IDENTIFY data
1927 * @ptr_io: (input/output) Location to store more output data
1928 * @last: End of output data buffer
1929 *
1930 * Generate a caching info page, which conditionally indicates
1931 * write caching to the SCSI layer, depending on device
1932 * capabilities.
1933 *
1934 * LOCKING:
1935 * None.
1936 */
1937
1938static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io,
1939 const u8 *last)
1940{
00ac37f5 1941 u8 page[CACHE_MPAGE_LEN];
1da177e4 1942
00ac37f5 1943 memcpy(page, def_cache_mpage, sizeof(page));
1da177e4
LT		 1944 if (ata_id_wcache_enabled(id))
1945 page[2] |= (1 << 2); /* write cache enable */
1946 if (!ata_id_rahead_enabled(id))
1947 page[12] |= (1 << 5); /* disable read ahead */
1948
1949 ata_msense_push(ptr_io, last, page, sizeof(page));
1950 return sizeof(page);
1951}
1952
1953/**
1954 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
1955 * @dev: Device associated with this MODE SENSE command
1956 * @ptr_io: (input/output) Location to store more output data
1957 * @last: End of output data buffer
1958 *
1959 * Generate a generic MODE SENSE control mode page.
1960 *
1961 * LOCKING:
1962 * None.
1963 */
1964
1965static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last)
1966{
00ac37f5
DG		 1967 ata_msense_push(ptr_io, last, def_control_mpage,
1968 sizeof(def_control_mpage));
1969 return sizeof(def_control_mpage);
1da177e4
LT		 1970}
1971
1972/**
1973 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
1974 * @dev: Device associated with this MODE SENSE command
1975 * @ptr_io: (input/output) Location to store more output data
1976 * @last: End of output data buffer
1977 *
1978 * Generate a generic MODE SENSE r/w error recovery page.
1979 *
1980 * LOCKING:
1981 * None.
1982 */
1983
1984static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
1985{
1da177e4 1986
00ac37f5
DG		 1987 ata_msense_push(ptr_io, last, def_rw_recovery_mpage,
1988 sizeof(def_rw_recovery_mpage));
1989 return sizeof(def_rw_recovery_mpage);
1da177e4
LT		 1990}
1991
48bdc8ec
JA		 1992/*
1993 * We can turn this into a real blacklist if it's needed, for now just
1994 * blacklist any Maxtor BANC1G10 revision firmware
1995 */
1996static int ata_dev_supports_fua(u16 *id)
1997{
a0cf733b 1998 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
48bdc8ec 1999
c3c013a2
JG		 2000 if (!libata_fua)
2001 return 0;
48bdc8ec
JA		 2002 if (!ata_id_has_fua(id))
2003 return 0;
2004
a0cf733b
TH		 2005 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2006 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
48bdc8ec 2007
2e02671d 2008 if (strcmp(model, "Maxtor"))
48bdc8ec 2009 return 1;
2e02671d 2010 if (strcmp(fw, "BANC1G10"))
48bdc8ec
JA		 2011 return 1;
2012
2013 return 0; /* blacklisted */
2014}
2015
1da177e4
LT		 2016/**
2017 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2018 * @args: device IDENTIFY data / SCSI command of interest.
2019 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2020 * @buflen: Response buffer length.
2021 *
00ac37f5
DG		 2022 * Simulate MODE SENSE commands. Assume this is invoked for direct
2023 * access devices (e.g. disks) only. There should be no block
2024 * descriptor for other device types.
1da177e4
LT		 2025 *
2026 * LOCKING:
cca3974e 2027 * spin_lock_irqsave(host lock)
1da177e4
LT		 2028 */
2029
2030unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
2031 unsigned int buflen)
2032{
9a3dccc4 2033 struct ata_device *dev = args->dev;
1da177e4 2034 u8 *scsicmd = args->cmd->cmnd, *p, *last;
00ac37f5
DG		 2035 const u8 sat_blk_desc[] = {
2036 0, 0, 0, 0, /* number of blocks: sat unspecified */
2037 0,
2038 0, 0x2, 0x0 /* block length: 512 bytes */
2039 };
2040 u8 pg, spg;
2041 unsigned int ebd, page_control, six_byte, output_len, alloc_len, minlen;
9a3dccc4 2042 u8 dpofua;
1da177e4
LT		 2043
2044 VPRINTK("ENTER\n");
2045
2046 six_byte = (scsicmd[0] == MODE_SENSE);
00ac37f5
DG		 2047 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2048 /*
2049 * LLBA bit in msense(10) ignored (compliant)
1da177e4 2050 */
00ac37f5 2051
1da177e4 2052 page_control = scsicmd[2] >> 6;
ae006510
DG		 2053 switch (page_control) {
2054 case 0: /* current */
2055 break; /* supported */
2056 case 3: /* saved */
2057 goto saving_not_supp;
2058 case 1: /* changeable */
2059 case 2: /* defaults */
2060 default:
2061 goto invalid_fld;
2062 }
1da177e4 2063
00ac37f5
DG		 2064 if (six_byte) {
2065 output_len = 4 + (ebd ? 8 : 0);
2066 alloc_len = scsicmd[4];
2067 } else {
2068 output_len = 8 + (ebd ? 8 : 0);
2069 alloc_len = (scsicmd[7] << 8) + scsicmd[8];
2070 }
2071 minlen = (alloc_len < buflen) ? alloc_len : buflen;
1da177e4
LT		 2072
2073 p = rbuf + output_len;
00ac37f5 2074 last = rbuf + minlen - 1;
1da177e4 2075
00ac37f5
DG		 2076 pg = scsicmd[2] & 0x3f;
2077 spg = scsicmd[3];
2078 /*
2079 * No mode subpages supported (yet) but asking for _all_
2080 * subpages may be valid
2081 */
2082 if (spg && (spg != ALL_SUB_MPAGES))
2083 goto invalid_fld;
2084
2085 switch(pg) {
2086 case RW_RECOVERY_MPAGE:
1da177e4
LT		 2087 output_len += ata_msense_rw_recovery(&p, last);
2088 break;
2089
00ac37f5 2090 case CACHE_MPAGE:
1da177e4
LT		 2091 output_len += ata_msense_caching(args->id, &p, last);
2092 break;
2093
00ac37f5 2094 case CONTROL_MPAGE: {
1da177e4
LT		 2095 output_len += ata_msense_ctl_mode(&p, last);
2096 break;
2097 }
2098
00ac37f5 2099 case ALL_MPAGES:
1da177e4
LT		 2100 output_len += ata_msense_rw_recovery(&p, last);
2101 output_len += ata_msense_caching(args->id, &p, last);
2102 output_len += ata_msense_ctl_mode(&p, last);
2103 break;
2104
2105 default: /* invalid page code */
ae006510 2106 goto invalid_fld;
1da177e4
LT		 2107 }
2108
00ac37f5
DG		 2109 if (minlen < 1)
2110 return 0;
9a3dccc4
TH		 2111
2112 dpofua = 0;
f79d409f 2113 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
9a3dccc4
TH		 2114 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2115 dpofua = 1 << 4;
2116
1da177e4
LT		 2117 if (six_byte) {
2118 output_len--;
2119 rbuf[0] = output_len;
9a3dccc4
TH		 2120 if (minlen > 2)
2121 rbuf[2] |= dpofua;
00ac37f5
DG		 2122 if (ebd) {
2123 if (minlen > 3)
2124 rbuf[3] = sizeof(sat_blk_desc);
2125 if (minlen > 11)
2126 memcpy(rbuf + 4, sat_blk_desc,
2127 sizeof(sat_blk_desc));
2128 }
1da177e4
LT		 2129 } else {
2130 output_len -= 2;
2131 rbuf[0] = output_len >> 8;
00ac37f5
DG		 2132 if (minlen > 1)
2133 rbuf[1] = output_len;
9a3dccc4
TH		 2134 if (minlen > 3)
2135 rbuf[3] |= dpofua;
00ac37f5
DG		 2136 if (ebd) {
2137 if (minlen > 7)
2138 rbuf[7] = sizeof(sat_blk_desc);
2139 if (minlen > 15)
2140 memcpy(rbuf + 8, sat_blk_desc,
2141 sizeof(sat_blk_desc));
2142 }
1da177e4 2143 }
1da177e4 2144 return 0;
ae006510
DG		 2145
2146invalid_fld:
2147 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2148 /* "Invalid field in cbd" */
2149 return 1;
2150
2151saving_not_supp:
2152 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2153 /* "Saving parameters not supported" */
2154 return 1;
1da177e4
LT		 2155}
2156
2157/**
2158 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2159 * @args: device IDENTIFY data / SCSI command of interest.
2160 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2161 * @buflen: Response buffer length.
2162 *
2163 * Simulate READ CAPACITY commands.
2164 *
2165 * LOCKING:
6a36261e 2166 * None.
1da177e4 2167 */
1da177e4
LT		 2168unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
2169 unsigned int buflen)
2170{
6a36261e 2171 u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */
1da177e4
LT		 2172
2173 VPRINTK("ENTER\n");
2174
1da177e4 2175 if (args->cmd->cmnd[0] == READ_CAPACITY) {
6a36261e
TH		 2176 if (last_lba >= 0xffffffffULL)
2177 last_lba = 0xffffffff;
0c144d0d 2178
1da177e4 2179 /* sector count, 32-bit */
6a36261e
TH		 2180 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 3));
2181 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 2));
2182 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 1));
2183 ATA_SCSI_RBUF_SET(3, last_lba);
1da177e4
LT		 2184
2185 /* sector size */
6a36261e
TH		 2186 ATA_SCSI_RBUF_SET(6, ATA_SECT_SIZE >> 8);
2187 ATA_SCSI_RBUF_SET(7, ATA_SECT_SIZE);
1da177e4
LT		 2188 } else {
2189 /* sector count, 64-bit */
6a36261e
TH		 2190 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 7));
2191 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 6));
2192 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 5));
2193 ATA_SCSI_RBUF_SET(3, last_lba >> (8 * 4));
2194 ATA_SCSI_RBUF_SET(4, last_lba >> (8 * 3));
2195 ATA_SCSI_RBUF_SET(5, last_lba >> (8 * 2));
2196 ATA_SCSI_RBUF_SET(6, last_lba >> (8 * 1));
2197 ATA_SCSI_RBUF_SET(7, last_lba);
1da177e4
LT		 2198
2199 /* sector size */
6a36261e
TH		 2200 ATA_SCSI_RBUF_SET(10, ATA_SECT_SIZE >> 8);
2201 ATA_SCSI_RBUF_SET(11, ATA_SECT_SIZE);
1da177e4
LT		 2202 }
2203
2204 return 0;
2205}
2206
2207/**
2208 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2209 * @args: device IDENTIFY data / SCSI command of interest.
2210 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2211 * @buflen: Response buffer length.
2212 *
2213 * Simulate REPORT LUNS command.
2214 *
2215 * LOCKING:
cca3974e 2216 * spin_lock_irqsave(host lock)
1da177e4
LT		 2217 */
2218
2219unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
2220 unsigned int buflen)
2221{
2222 VPRINTK("ENTER\n");
2223 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2224
2225 return 0;
2226}
2227
845c5834
DG		 2228/**
2229 * ata_scsi_set_sense - Set SCSI sense data and status
2230 * @cmd: SCSI request to be handled
2231 * @sk: SCSI-defined sense key
2232 * @asc: SCSI-defined additional sense code
2233 * @ascq: SCSI-defined additional sense code qualifier
2234 *
2235 * Helper function that builds a valid fixed format, current
2236 * response code and the given sense key (sk), additional sense
2237 * code (asc) and additional sense code qualifier (ascq) with
2238 * a SCSI command status of %SAM_STAT_CHECK_CONDITION and
2239 * DRIVER_SENSE set in the upper bits of scsi_cmnd::result .
2240 *
2241 * LOCKING:
2242 * Not required
2243 */
2244
2245void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
2246{
2247 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
2248
2249 cmd->sense_buffer[0] = 0x70; /* fixed format, current */
2250 cmd->sense_buffer[2] = sk;
2251 cmd->sense_buffer[7] = 18 - 8; /* additional sense length */
2252 cmd->sense_buffer[12] = asc;
2253 cmd->sense_buffer[13] = ascq;
2254}
2255
1da177e4
LT		 2256/**
2257 * ata_scsi_badcmd - End a SCSI request with an error
2258 * @cmd: SCSI request to be handled
2259 * @done: SCSI command completion function
2260 * @asc: SCSI-defined additional sense code
2261 * @ascq: SCSI-defined additional sense code qualifier
2262 *
2263 * Helper function that completes a SCSI command with
2264 * %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST
2265 * and the specified additional sense codes.
2266 *
2267 * LOCKING:
cca3974e 2268 * spin_lock_irqsave(host lock)
1da177e4
LT		 2269 */
2270
2271void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq)
2272{
2273 DPRINTK("ENTER\n");
ae006510 2274 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq);
1da177e4
LT		 2275
2276 done(cmd);
2277}
2278
77853bf2 2279static void atapi_sense_complete(struct ata_queued_cmd *qc)
a939c963 2280{
74e6c8c3 2281 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
c6e6e666
JG		 2282 /* FIXME: not quite right; we don't want the
2283 * translation of taskfile registers into
2284 * a sense descriptors, since that's only
2285 * correct for ATA, not ATAPI
2286 */
750426aa 2287 ata_gen_passthru_sense(qc);
74e6c8c3 2288 }
a939c963 2289
c6e6e666 2290 qc->scsidone(qc->scsicmd);
77853bf2 2291 ata_qc_free(qc);
c6e6e666 2292}
a939c963 2293
c6e6e666
JG		 2294/* is it pointless to prefer PIO for "safety reasons"? */
2295static inline int ata_pio_use_silly(struct ata_port *ap)
2296{
2297 return (ap->flags & ATA_FLAG_PIO_DMA);
2298}
2299
2300static void atapi_request_sense(struct ata_queued_cmd *qc)
2301{
2302 struct ata_port *ap = qc->ap;
2303 struct scsi_cmnd *cmd = qc->scsicmd;
2304
2305 DPRINTK("ATAPI request sense\n");
a939c963
JG		 2306
2307 /* FIXME: is this needed? */
2308 memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
2309
c6e6e666
JG		 2310 ap->ops->tf_read(ap, &qc->tf);
2311
2312 /* fill these in, for the case where they are -not- overwritten */
2313 cmd->sense_buffer[0] = 0x70;
2314 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2315
2316 ata_qc_reinit(qc);
2317
a939c963
JG		 2318 ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer));
2319 qc->dma_dir = DMA_FROM_DEVICE;
2320
6e7846e9 2321 memset(&qc->cdb, 0, qc->dev->cdb_len);
a939c963
JG		 2322 qc->cdb[0] = REQUEST_SENSE;
2323 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2324
2325 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2326 qc->tf.command = ATA_CMD_PACKET;
2327
c6e6e666
JG		 2328 if (ata_pio_use_silly(ap)) {
2329 qc->tf.protocol = ATA_PROT_ATAPI_DMA;
2330 qc->tf.feature |= ATAPI_PKT_DMA;
2331 } else {
2332 qc->tf.protocol = ATA_PROT_ATAPI;
2333 qc->tf.lbam = (8 * 1024) & 0xff;
2334 qc->tf.lbah = (8 * 1024) >> 8;
2335 }
a939c963
JG		 2336 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2337
c6e6e666 2338 qc->complete_fn = atapi_sense_complete;
a939c963 2339
8e0e694a 2340 ata_qc_issue(qc);
a939c963
JG		 2341
2342 DPRINTK("EXIT\n");
2343}
2344
77853bf2 2345static void atapi_qc_complete(struct ata_queued_cmd *qc)
1da177e4
LT		 2346{
2347 struct scsi_cmnd *cmd = qc->scsicmd;
a22e2eb0 2348 unsigned int err_mask = qc->err_mask;
1da177e4 2349
a7dac447 2350 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
e12669e7 2351
246619da
TH		 2352 /* handle completion from new EH */
2353 if (unlikely(qc->ap->ops->error_handler &&
2354 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2355
2356 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2357 /* FIXME: not quite right; we don't want the
2358 * translation of taskfile registers into a
2359 * sense descriptors, since that's only
2360 * correct for ATA, not ATAPI
2361 */
750426aa 2362 ata_gen_passthru_sense(qc);
246619da
TH		 2363 }
2364
22aac089
TH		 2365 /* SCSI EH automatically locks door if sdev->locked is
2366 * set. Sometimes door lock request continues to
2367 * fail, for example, when no media is present. This
2368 * creates a loop - SCSI EH issues door lock which
2369 * fails and gets invoked again to acquire sense data
2370 * for the failed command.
2371 *
2372 * If door lock fails, always clear sdev->locked to
2373 * avoid this infinite loop.
2374 */
2375 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
2376 qc->dev->sdev->locked = 0;
2377
246619da
TH		 2378 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2379 qc->scsidone(cmd);
2380 ata_qc_free(qc);
2381 return;
2382 }
2383
2384 /* successful completion or old EH failure path */
a7dac447 2385 if (unlikely(err_mask & AC_ERR_DEV)) {
1da177e4 2386 cmd->result = SAM_STAT_CHECK_CONDITION;
c6e6e666 2387 atapi_request_sense(qc);
77853bf2 2388 return;
74e6c8c3 2389 } else if (unlikely(err_mask)) {
a7dac447
JG		 2390 /* FIXME: not quite right; we don't want the
2391 * translation of taskfile registers into
2392 * a sense descriptors, since that's only
2393 * correct for ATA, not ATAPI
2394 */
750426aa 2395 ata_gen_passthru_sense(qc);
74e6c8c3 2396 } else {
1da177e4
LT		 2397 u8 *scsicmd = cmd->cmnd;
2398
fd71da46 2399 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
1da177e4
LT		 2400 u8 *buf = NULL;
2401 unsigned int buflen;
2402
2403 buflen = ata_scsi_rbuf_get(cmd, &buf);
a15dbeb4
JG		 2404
2405 /* ATAPI devices typically report zero for their SCSI version,
2406 * and sometimes deviate from the spec WRT response data
2407 * format. If SCSI version is reported as zero like normal,
2408 * then we make the following fixups: 1) Fake MMC-5 version,
2409 * to indicate to the Linux scsi midlayer this is a modern
2410 * device. 2) Ensure response data format / ATAPI information
2411 * are always correct.
a15dbeb4
JG		 2412 */
2413 if (buf[2] == 0) {
2414 buf[2] = 0x5;
2415 buf[3] = 0x32;
2416 }
2417
1da177e4
LT		 2418 ata_scsi_rbuf_put(cmd, buf);
2419 }
a15dbeb4 2420
1da177e4
LT		 2421 cmd->result = SAM_STAT_GOOD;
2422 }
2423
2424 qc->scsidone(cmd);
77853bf2 2425 ata_qc_free(qc);
1da177e4
LT		 2426}
2427/**
2428 * atapi_xlat - Initialize PACKET taskfile
2429 * @qc: command structure to be initialized
1da177e4
LT		 2430 *
2431 * LOCKING:
cca3974e 2432 * spin_lock_irqsave(host lock)
1da177e4
LT		 2433 *
2434 * RETURNS:
2435 * Zero on success, non-zero on failure.
2436 */
ad706991 2437static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
1da177e4 2438{
542b1444 2439 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4
LT		 2440 struct ata_device *dev = qc->dev;
2441 int using_pio = (dev->flags & ATA_DFLAG_PIO);
542b1444 2442 int nodata = (scmd->sc_data_direction == DMA_NONE);
1da177e4
LT		 2443
2444 if (!using_pio)
2445 /* Check whether ATAPI DMA is safe */
2446 if (ata_check_atapi_dma(qc))
2447 using_pio = 1;
2448
2e5704f6
TH		 2449 memset(qc->cdb, 0, dev->cdb_len);
2450 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
1da177e4
LT		 2451
2452 qc->complete_fn = atapi_qc_complete;
2453
2454 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
542b1444 2455 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1da177e4
LT		 2456 qc->tf.flags |= ATA_TFLAG_WRITE;
2457 DPRINTK("direction: write\n");
2458 }
2459
2460 qc->tf.command = ATA_CMD_PACKET;
2461
2462 /* no data, or PIO data xfer */
2463 if (using_pio || nodata) {
2464 if (nodata)
2465 qc->tf.protocol = ATA_PROT_ATAPI_NODATA;
2466 else
2467 qc->tf.protocol = ATA_PROT_ATAPI;
2468 qc->tf.lbam = (8 * 1024) & 0xff;
2469 qc->tf.lbah = (8 * 1024) >> 8;
2470 }
2471
2472 /* DMA data xfer */
2473 else {
2474 qc->tf.protocol = ATA_PROT_ATAPI_DMA;
2475 qc->tf.feature |= ATAPI_PKT_DMA;
2476
542b1444 2477 if (atapi_dmadir && (scmd->sc_data_direction != DMA_TO_DEVICE))
95de719a 2478 /* some SATA bridges need us to indicate data xfer direction */
1da177e4 2479 qc->tf.feature |= ATAPI_DMADIR;
1da177e4
LT		 2480 }
2481
542b1444 2482 qc->nbytes = scmd->request_bufflen;
1da177e4
LT		 2483
2484 return 0;
2485}
2486
ab5b3a5b
TH		 2487static struct ata_device * ata_find_dev(struct ata_port *ap, int id)
2488{
2489 if (likely(id < ATA_MAX_DEVICES))
2490 return &ap->device[id];
2491 return NULL;
2492}
2493
2494static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
2495 const struct scsi_device *scsidev)
2496{
2497 /* skip commands not addressed to targets we simulate */
2498 if (unlikely(scsidev->channel || scsidev->lun))
2499 return NULL;
2500
2501 return ata_find_dev(ap, scsidev->id);
2502}
2503
99ba9e09
BK		 2504/**
2505 * ata_scsi_dev_enabled - determine if device is enabled
2506 * @dev: ATA device
2507 *
2508 * Determine if commands should be sent to the specified device.
2509 *
2510 * LOCKING:
cca3974e 2511 * spin_lock_irqsave(host lock)
99ba9e09
BK		 2512 *
2513 * RETURNS:
2514 * 0 if commands are not allowed / 1 if commands are allowed
2515 */
2516
2517static int ata_scsi_dev_enabled(struct ata_device *dev)
2518{
2519 if (unlikely(!ata_dev_enabled(dev)))
2520 return 0;
2521
2522 if (!atapi_enabled || (dev->ap->flags & ATA_FLAG_NO_ATAPI)) {
2523 if (unlikely(dev->class == ATA_DEV_ATAPI)) {
2524 ata_dev_printk(dev, KERN_WARNING,
2525 "WARNING: ATAPI is %s, device ignored.\n",
2526 atapi_enabled ? "not supported with this driver" : "disabled");
2527 return 0;
2528 }
2529 }
2530
2531 return 1;
2532}
2533
1da177e4
LT		 2534/**
2535 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2536 * @ap: ATA port to which the device is attached
2537 * @scsidev: SCSI device from which we derive the ATA device
2538 *
2539 * Given various information provided in struct scsi_cmnd,
2540 * map that onto an ATA bus, and using that mapping
2541 * determine which ata_device is associated with the
2542 * SCSI command to be sent.
2543 *
2544 * LOCKING:
cca3974e 2545 * spin_lock_irqsave(host lock)
1da177e4
LT		 2546 *
2547 * RETURNS:
2548 * Associated ATA device, or %NULL if not found.
2549 */
1da177e4 2550static struct ata_device *
057ace5e 2551ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
1da177e4 2552{
ab5b3a5b 2553 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
1da177e4 2554
99ba9e09 2555 if (unlikely(!dev || !ata_scsi_dev_enabled(dev)))
1da177e4
LT		 2556 return NULL;
2557
1da177e4
LT		 2558 return dev;
2559}
2560
b095518e
JG		 2561/*
2562 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2563 * @byte1: Byte 1 from pass-thru CDB.
2564 *
2565 * RETURNS:
2566 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2567 */
2568static u8
2569ata_scsi_map_proto(u8 byte1)
2570{
2571 switch((byte1 & 0x1e) >> 1) {
2572 case 3: /* Non-data */
2573 return ATA_PROT_NODATA;
2574
2575 case 6: /* DMA */
2576 return ATA_PROT_DMA;
2577
2578 case 4: /* PIO Data-in */
2579 case 5: /* PIO Data-out */
b095518e
JG		 2580 return ATA_PROT_PIO;
2581
2582 case 10: /* Device Reset */
2583 case 0: /* Hard Reset */
2584 case 1: /* SRST */
2585 case 2: /* Bus Idle */
2586 case 7: /* Packet */
2587 case 8: /* DMA Queued */
2588 case 9: /* Device Diagnostic */
2589 case 11: /* UDMA Data-in */
2590 case 12: /* UDMA Data-Out */
2591 case 13: /* FPDMA */
2592 default: /* Reserved */
2593 break;
2594 }
2595
2596 return ATA_PROT_UNKNOWN;
2597}
2598
2599/**
2600 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2601 * @qc: command structure to be initialized
b095518e
JG		 2602 *
2603 * Handles either 12 or 16-byte versions of the CDB.
2604 *
2605 * RETURNS:
2606 * Zero on success, non-zero on failure.
2607 */
ad706991 2608static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
b095518e
JG		 2609{
2610 struct ata_taskfile *tf = &(qc->tf);
542b1444 2611 struct scsi_cmnd *scmd = qc->scsicmd;
f79d409f 2612 struct ata_device *dev = qc->dev;
ad706991 2613 const u8 *cdb = scmd->cmnd;
b095518e 2614
542b1444 2615 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
9a405257 2616 goto invalid_fld;
8190bdb9 2617
f79d409f
AC		 2618 /* We may not issue DMA commands if no DMA mode is set */
2619 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2620 goto invalid_fld;
b095518e 2621
542b1444 2622 if (cdb[1] & 0xe0)
f59b0cf8
AL		 2623 /* PIO multi not supported yet */
2624 goto invalid_fld;
2625
b095518e
JG		 2626 /*
2627 * 12 and 16 byte CDBs use different offsets to
2628 * provide the various register values.
2629 */
542b1444 2630 if (cdb[0] == ATA_16) {
b095518e
JG		 2631 /*
2632 * 16-byte CDB - may contain extended commands.
2633 *
2634 * If that is the case, copy the upper byte register values.
2635 */
542b1444
TH		 2636 if (cdb[1] & 0x01) {
2637 tf->hob_feature = cdb[3];
2638 tf->hob_nsect = cdb[5];
2639 tf->hob_lbal = cdb[7];
2640 tf->hob_lbam = cdb[9];
2641 tf->hob_lbah = cdb[11];
b095518e
JG		 2642 tf->flags |= ATA_TFLAG_LBA48;
2643 } else
2644 tf->flags &= ~ATA_TFLAG_LBA48;
2645
2646 /*
2647 * Always copy low byte, device and command registers.
2648 */
542b1444
TH		 2649 tf->feature = cdb[4];
2650 tf->nsect = cdb[6];
2651 tf->lbal = cdb[8];
2652 tf->lbam = cdb[10];
2653 tf->lbah = cdb[12];
2654 tf->device = cdb[13];
2655 tf->command = cdb[14];
b095518e
JG		 2656 } else {
2657 /*
2658 * 12-byte CDB - incapable of extended commands.
2659 */
2660 tf->flags &= ~ATA_TFLAG_LBA48;
2661
542b1444
TH		 2662 tf->feature = cdb[3];
2663 tf->nsect = cdb[4];
2664 tf->lbal = cdb[5];
2665 tf->lbam = cdb[6];
2666 tf->lbah = cdb[7];
2667 tf->device = cdb[8];
2668 tf->command = cdb[9];
b095518e 2669 }
dcc2d1e7
ML		 2670 /*
2671 * If slave is possible, enforce correct master/slave bit
2672 */
2673 if (qc->ap->flags & ATA_FLAG_SLAVE_POSS)
2674 tf->device = qc->dev->devno ?
2675 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
b095518e
JG		 2676
2677 /*
2678 * Filter SET_FEATURES - XFER MODE command -- otherwise,
2679 * SET_FEATURES - XFER MODE must be preceded/succeeded
2680 * by an update to hardware-specific registers for each
2681 * controller (i.e. the reason for ->set_piomode(),
2682 * ->set_dmamode(), and ->post_set_mode() hooks).
2683 */
2684 if ((tf->command == ATA_CMD_SET_FEATURES)
2685 && (tf->feature == SETFEATURES_XFER))
9a405257 2686 goto invalid_fld;
b095518e
JG		 2687
2688 /*
2689 * Set flags so that all registers will be written,
2690 * and pass on write indication (used for PIO/DMA
2691 * setup.)
2692 */
2693 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
2694
542b1444 2695 if (scmd->sc_data_direction == DMA_TO_DEVICE)
b095518e
JG		 2696 tf->flags |= ATA_TFLAG_WRITE;
2697
2698 /*
2699 * Set transfer length.
2700 *
2701 * TODO: find out if we need to do more here to
2702 * cover scatter/gather case.
2703 */
726f0785 2704 qc->nbytes = scmd->request_bufflen;
b095518e 2705
e61e0672
TH		 2706 /* request result TF */
2707 qc->flags |= ATA_QCFLAG_RESULT_TF;
2708
b095518e 2709 return 0;
9a405257
TH		 2710
2711 invalid_fld:
542b1444 2712 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
9a405257
TH		 2713 /* "Invalid field in cdb" */
2714 return 1;
b095518e
JG		 2715}
2716
1da177e4
LT		 2717/**
2718 * ata_get_xlat_func - check if SCSI to ATA translation is possible
2719 * @dev: ATA device
2720 * @cmd: SCSI command opcode to consider
2721 *
2722 * Look up the SCSI command given, and determine whether the
2723 * SCSI command is to be translated or simulated.
2724 *
2725 * RETURNS:
2726 * Pointer to translation function if possible, %NULL if not.
2727 */
2728
2729static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
2730{
2731 switch (cmd) {
2732 case READ_6:
2733 case READ_10:
2734 case READ_16:
2735
2736 case WRITE_6:
2737 case WRITE_10:
2738 case WRITE_16:
2739 return ata_scsi_rw_xlat;
2740
2741 case SYNCHRONIZE_CACHE:
2742 if (ata_try_flush_cache(dev))
2743 return ata_scsi_flush_xlat;
2744 break;
2745
2746 case VERIFY:
2747 case VERIFY_16:
2748 return ata_scsi_verify_xlat;
b095518e
JG		 2749
2750 case ATA_12:
2751 case ATA_16:
2752 return ata_scsi_pass_thru;
da61396d 2753
972dcafb
DG		 2754 case START_STOP:
2755 return ata_scsi_start_stop_xlat;
1da177e4
LT		 2756 }
2757
2758 return NULL;
2759}
2760
2761/**
2762 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
2763 * @ap: ATA port to which the command was being sent
2764 * @cmd: SCSI command to dump
2765 *
2766 * Prints the contents of a SCSI command via printk().
2767 */
2768
2769static inline void ata_scsi_dump_cdb(struct ata_port *ap,
2770 struct scsi_cmnd *cmd)
2771{
2772#ifdef ATA_DEBUG
2773 struct scsi_device *scsidev = cmd->device;
2774 u8 *scsicmd = cmd->cmnd;
2775
2776 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
2777 ap->id,
2778 scsidev->channel, scsidev->id, scsidev->lun,
2779 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
2780 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
2781 scsicmd[8]);
2782#endif
2783}
2784
542b1444 2785static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2115ea94
TH		 2786 void (*done)(struct scsi_cmnd *),
2787 struct ata_device *dev)
eb3f0f9c 2788{
2115ea94
TH		 2789 int rc = 0;
2790
2e5704f6
TH		 2791 if (unlikely(!scmd->cmd_len)) {
2792 ata_dev_printk(dev, KERN_WARNING, "WARNING: zero len CDB\n");
2793 scmd->result = DID_ERROR << 16;
2794 done(scmd);
2795 return 0;
2796 }
2797
eb3f0f9c
BK		 2798 if (dev->class == ATA_DEV_ATA) {
2799 ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
542b1444 2800 scmd->cmnd[0]);
eb3f0f9c
BK		 2801
2802 if (xlat_func)
542b1444 2803 rc = ata_scsi_translate(dev, scmd, done, xlat_func);
eb3f0f9c 2804 else
542b1444 2805 ata_scsi_simulate(dev, scmd, done);
eb3f0f9c 2806 } else
542b1444 2807 rc = ata_scsi_translate(dev, scmd, done, atapi_xlat);
2115ea94
TH		 2808
2809 return rc;
eb3f0f9c
BK		 2810}
2811
1da177e4
LT		 2812/**
2813 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
2814 * @cmd: SCSI command to be sent
2815 * @done: Completion function, called when command is complete
2816 *
2817 * In some cases, this function translates SCSI commands into
2818 * ATA taskfiles, and queues the taskfiles to be sent to
2819 * hardware. In other cases, this function simulates a
2820 * SCSI device by evaluating and responding to certain
2821 * SCSI commands. This creates the overall effect of
2822 * ATA and ATAPI devices appearing as SCSI devices.
2823 *
2824 * LOCKING:
cca3974e 2825 * Releases scsi-layer-held lock, and obtains host lock.
1da177e4
LT		 2826 *
2827 * RETURNS:
2115ea94
TH		 2828 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
2829 * 0 otherwise.
1da177e4 2830 */
1da177e4
LT		 2831int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
2832{
2833 struct ata_port *ap;
2834 struct ata_device *dev;
2835 struct scsi_device *scsidev = cmd->device;
005a5a06 2836 struct Scsi_Host *shost = scsidev->host;
2115ea94 2837 int rc = 0;
1da177e4 2838
35bb94b1 2839 ap = ata_shost_to_port(shost);
005a5a06
JG		 2840
2841 spin_unlock(shost->host_lock);
ba6a1308 2842 spin_lock(ap->lock);
1da177e4
LT		 2843
2844 ata_scsi_dump_cdb(ap, cmd);
2845
2846 dev = ata_scsi_find_dev(ap, scsidev);
eb3f0f9c 2847 if (likely(dev))
2115ea94 2848 rc = __ata_scsi_queuecmd(cmd, done, dev);
eb3f0f9c 2849 else {
1da177e4
LT		 2850 cmd->result = (DID_BAD_TARGET << 16);
2851 done(cmd);
1da177e4
LT		 2852 }
2853
ba6a1308 2854 spin_unlock(ap->lock);
005a5a06 2855 spin_lock(shost->host_lock);
2115ea94 2856 return rc;
1da177e4
LT		 2857}
2858
2859/**
2860 * ata_scsi_simulate - simulate SCSI command on ATA device
c893a3ae 2861 * @dev: the target device
1da177e4
LT		 2862 * @cmd: SCSI command being sent to device.
2863 * @done: SCSI command completion function.
2864 *
2865 * Interprets and directly executes a select list of SCSI commands
2866 * that can be handled internally.
2867 *
2868 * LOCKING:
cca3974e 2869 * spin_lock_irqsave(host lock)
1da177e4
LT		 2870 */
2871
3373efd8 2872void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
1da177e4
LT		 2873 void (*done)(struct scsi_cmnd *))
2874{
2875 struct ata_scsi_args args;
057ace5e 2876 const u8 *scsicmd = cmd->cmnd;
1da177e4 2877
9a3dccc4
TH		 2878 args.dev = dev;
2879 args.id = dev->id;
1da177e4
LT		 2880 args.cmd = cmd;
2881 args.done = done;
2882
2883 switch(scsicmd[0]) {
2884 /* no-op's, complete with success */
2885 case SYNCHRONIZE_CACHE:
2886 case REZERO_UNIT:
2887 case SEEK_6:
2888 case SEEK_10:
2889 case TEST_UNIT_READY:
2890 case FORMAT_UNIT: /* FIXME: correct? */
2891 case SEND_DIAGNOSTIC: /* FIXME: correct? */
2892 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
2893 break;
2894
2895 case INQUIRY:
2896 if (scsicmd[1] & 2) /* is CmdDt set? */
ae006510 2897 ata_scsi_invalid_field(cmd, done);
1da177e4
LT		 2898 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
2899 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
2900 else if (scsicmd[2] == 0x00)
2901 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
2902 else if (scsicmd[2] == 0x80)
2903 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
2904 else if (scsicmd[2] == 0x83)
2905 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
2906 else
ae006510 2907 ata_scsi_invalid_field(cmd, done);
1da177e4
LT		 2908 break;
2909
2910 case MODE_SENSE:
2911 case MODE_SENSE_10:
2912 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
2913 break;
2914
2915 case MODE_SELECT: /* unconditionally return */
2916 case MODE_SELECT_10: /* bad-field-in-cdb */
ae006510 2917 ata_scsi_invalid_field(cmd, done);
1da177e4
LT		 2918 break;
2919
2920 case READ_CAPACITY:
2921 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2922 break;
2923
2924 case SERVICE_ACTION_IN:
2925 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
2926 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2927 else
ae006510 2928 ata_scsi_invalid_field(cmd, done);
1da177e4
LT		 2929 break;
2930
2931 case REPORT_LUNS:
2932 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
2933 break;
2934
b095518e 2935 /* mandatory commands we haven't implemented yet */
1da177e4
LT		 2936 case REQUEST_SENSE:
2937
2938 /* all other commands */
2939 default:
ae006510
DG		 2940 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
2941 /* "Invalid command operation code" */
2942 done(cmd);
1da177e4
LT		 2943 break;
2944 }
2945}
2946
644dd0cc
JG		 2947void ata_scsi_scan_host(struct ata_port *ap)
2948{
2949 unsigned int i;
2950
198e0fed 2951 if (ap->flags & ATA_FLAG_DISABLED)
644dd0cc
JG		 2952 return;
2953
3f19ee8c 2954 for (i = 0; i < ATA_MAX_DEVICES; i++) {
3edebac4
TH		 2955 struct ata_device *dev = &ap->device[i];
2956 struct scsi_device *sdev;
2957
2958 if (!ata_dev_enabled(dev) || dev->sdev)
2959 continue;
3f19ee8c 2960
cca3974e 2961 sdev = __scsi_add_device(ap->scsi_host, 0, i, 0, NULL);
3edebac4
TH		 2962 if (!IS_ERR(sdev)) {
2963 dev->sdev = sdev;
2964 scsi_device_put(sdev);
2965 }
3f19ee8c 2966 }
644dd0cc 2967}
0ea035a3
TH		 2968
2969/**
2970 * ata_scsi_offline_dev - offline attached SCSI device
2971 * @dev: ATA device to offline attached SCSI device for
2972 *
2973 * This function is called from ata_eh_hotplug() and responsible
2974 * for taking the SCSI device attached to @dev offline. This
cca3974e 2975 * function is called with host lock which protects dev->sdev
0ea035a3
TH		 2976 * against clearing.
2977 *
2978 * LOCKING:
cca3974e 2979 * spin_lock_irqsave(host lock)
0ea035a3
TH		 2980 *
2981 * RETURNS:
2982 * 1 if attached SCSI device exists, 0 otherwise.
2983 */
2984int ata_scsi_offline_dev(struct ata_device *dev)
2985{
2986 if (dev->sdev) {
2987 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
2988 return 1;
2989 }
2990 return 0;
2991}
580b2102
TH		 2992
2993/**
2994 * ata_scsi_remove_dev - remove attached SCSI device
2995 * @dev: ATA device to remove attached SCSI device for
2996 *
2997 * This function is called from ata_eh_scsi_hotplug() and
2998 * responsible for removing the SCSI device attached to @dev.
2999 *
3000 * LOCKING:
3001 * Kernel thread context (may sleep).
3002 */
3003static void ata_scsi_remove_dev(struct ata_device *dev)
3004{
3005 struct ata_port *ap = dev->ap;
3006 struct scsi_device *sdev;
3007 unsigned long flags;
3008
3009 /* Alas, we need to grab scan_mutex to ensure SCSI device
3010 * state doesn't change underneath us and thus
3011 * scsi_device_get() always succeeds. The mutex locking can
3012 * be removed if there is __scsi_device_get() interface which
3013 * increments reference counts regardless of device state.
3014 */
cca3974e 3015 mutex_lock(&ap->scsi_host->scan_mutex);
ba6a1308 3016 spin_lock_irqsave(ap->lock, flags);
580b2102 3017
cca3974e 3018 /* clearing dev->sdev is protected by host lock */
580b2102
TH		 3019 sdev = dev->sdev;
3020 dev->sdev = NULL;
3021
3022 if (sdev) {
3023 /* If user initiated unplug races with us, sdev can go
cca3974e 3024 * away underneath us after the host lock and
580b2102
TH		 3025 * scan_mutex are released. Hold onto it.
3026 */
3027 if (scsi_device_get(sdev) == 0) {
3028 /* The following ensures the attached sdev is
3029 * offline on return from ata_scsi_offline_dev()
3030 * regardless it wins or loses the race
3031 * against this function.
3032 */
3033 scsi_device_set_state(sdev, SDEV_OFFLINE);
3034 } else {
3035 WARN_ON(1);
3036 sdev = NULL;
3037 }
3038 }
3039
ba6a1308 3040 spin_unlock_irqrestore(ap->lock, flags);
cca3974e 3041 mutex_unlock(&ap->scsi_host->scan_mutex);
580b2102
TH		 3042
3043 if (sdev) {
3044 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
3045 sdev->sdev_gendev.bus_id);
3046
3047 scsi_remove_device(sdev);
3048 scsi_device_put(sdev);
3049 }
3050}
3051
3052/**
3053 * ata_scsi_hotplug - SCSI part of hotplug
65f27f38 3054 * @work: Pointer to ATA port to perform SCSI hotplug on
580b2102
TH		 3055 *
3056 * Perform SCSI part of hotplug. It's executed from a separate
3057 * workqueue after EH completes. This is necessary because SCSI
3058 * hot plugging requires working EH and hot unplugging is
3059 * synchronized with hot plugging with a mutex.
3060 *
3061 * LOCKING:
3062 * Kernel thread context (may sleep).
3063 */
65f27f38 3064void ata_scsi_hotplug(struct work_struct *work)
580b2102 3065{
65f27f38
DH		 3066 struct ata_port *ap =
3067 container_of(work, struct ata_port, hotplug_task.work);
580b2102
TH		 3068 int i;
3069
b51e9e5d 3070 if (ap->pflags & ATA_PFLAG_UNLOADING) {
580b2102
TH		 3071 DPRINTK("ENTER/EXIT - unloading\n");
3072 return;
3073 }
3074
3075 DPRINTK("ENTER\n");
3076
3077 /* unplug detached devices */
3078 for (i = 0; i < ATA_MAX_DEVICES; i++) {
3079 struct ata_device *dev = &ap->device[i];
3080 unsigned long flags;
3081
3082 if (!(dev->flags & ATA_DFLAG_DETACHED))
3083 continue;
3084
ba6a1308 3085 spin_lock_irqsave(ap->lock, flags);
580b2102 3086 dev->flags &= ~ATA_DFLAG_DETACHED;
ba6a1308 3087 spin_unlock_irqrestore(ap->lock, flags);
580b2102
TH		 3088
3089 ata_scsi_remove_dev(dev);
3090 }
3091
3092 /* scan for new ones */
3093 ata_scsi_scan_host(ap);
3094
3095 /* If we scanned while EH was in progress, scan would have
3096 * failed silently. Requeue if there are enabled but
3097 * unattached devices.
3098 */
3099 for (i = 0; i < ATA_MAX_DEVICES; i++) {
3100 struct ata_device *dev = &ap->device[i];
3101 if (ata_dev_enabled(dev) && !dev->sdev) {
7a44e910
AV		 3102 queue_delayed_work(ata_aux_wq, &ap->hotplug_task,
3103 round_jiffies_relative(HZ));
580b2102
TH		 3104 break;
3105 }
3106 }
3107
3108 DPRINTK("EXIT\n");
3109}
83c47bcb
TH		 3110
3111/**
3112 * ata_scsi_user_scan - indication for user-initiated bus scan
3113 * @shost: SCSI host to scan
3114 * @channel: Channel to scan
3115 * @id: ID to scan
3116 * @lun: LUN to scan
3117 *
3118 * This function is called when user explicitly requests bus
3119 * scan. Set probe pending flag and invoke EH.
3120 *
3121 * LOCKING:
3122 * SCSI layer (we don't care)
3123 *
3124 * RETURNS:
3125 * Zero.
3126 */
3127static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3128 unsigned int id, unsigned int lun)
3129{
3130 struct ata_port *ap = ata_shost_to_port(shost);
3131 unsigned long flags;
3132 int rc = 0;
3133
3134 if (!ap->ops->error_handler)
3135 return -EOPNOTSUPP;
3136
3137 if ((channel != SCAN_WILD_CARD && channel != 0) ||
3138 (lun != SCAN_WILD_CARD && lun != 0))
3139 return -EINVAL;
3140
ba6a1308 3141 spin_lock_irqsave(ap->lock, flags);
83c47bcb
TH		 3142
3143 if (id == SCAN_WILD_CARD) {
3144 ap->eh_info.probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
3145 ap->eh_info.action |= ATA_EH_SOFTRESET;
3146 } else {
3147 struct ata_device *dev = ata_find_dev(ap, id);
3148
3149 if (dev) {
3150 ap->eh_info.probe_mask |= 1 << dev->devno;
3151 ap->eh_info.action |= ATA_EH_SOFTRESET;
28324304 3152 ap->eh_info.flags |= ATA_EHI_RESUME_LINK;
83c47bcb
TH		 3153 } else
3154 rc = -EINVAL;
3155 }
3156
309afcb5 3157 if (rc == 0) {
83c47bcb 3158 ata_port_schedule_eh(ap);
309afcb5
TH		 3159 spin_unlock_irqrestore(ap->lock, flags);
3160 ata_port_wait_eh(ap);
3161 } else
3162 spin_unlock_irqrestore(ap->lock, flags);
83c47bcb
TH		 3163
3164 return rc;
3165}
3057ac3c 3166
3167/**
d0171269 3168 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
65f27f38 3169 * @work: Pointer to ATA port to perform scsi_rescan_device()
3057ac3c 3170 *
d0171269
TH		 3171 * After ATA pass thru (SAT) commands are executed successfully,
3172 * libata need to propagate the changes to SCSI layer. This
3173 * function must be executed from ata_aux_wq such that sdev
3174 * attach/detach don't race with rescan.
3057ac3c 3175 *
d0171269
TH		 3176 * LOCKING:
3177 * Kernel thread context (may sleep).
3057ac3c 3178 */
65f27f38 3179void ata_scsi_dev_rescan(struct work_struct *work)
3057ac3c 3180{
65f27f38
DH		 3181 struct ata_port *ap =
3182 container_of(work, struct ata_port, scsi_rescan_task);
f84e7e41 3183 unsigned long flags;
3057ac3c 3184 unsigned int i;
3185
f84e7e41
TH		 3186 spin_lock_irqsave(ap->lock, flags);
3187
3057ac3c 3188 for (i = 0; i < ATA_MAX_DEVICES; i++) {
f84e7e41
TH		 3189 struct ata_device *dev = &ap->device[i];
3190 struct scsi_device *sdev = dev->sdev;
3057ac3c 3191
f84e7e41
TH		 3192 if (!ata_dev_enabled(dev) || !sdev)
3193 continue;
3194 if (scsi_device_get(sdev))
3195 continue;
3196
3197 spin_unlock_irqrestore(ap->lock, flags);
3198 scsi_rescan_device(&(sdev->sdev_gendev));
3199 scsi_device_put(sdev);
3200 spin_lock_irqsave(ap->lock, flags);
3057ac3c 3201 }
f84e7e41
TH		 3202
3203 spin_unlock_irqrestore(ap->lock, flags);
3057ac3c 3204}
80289167
BK		 3205
3206/**
3207 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
4f931374 3208 * @host: ATA host container for all SAS ports
80289167 3209 * @port_info: Information from low-level host driver
cca3974e 3210 * @shost: SCSI host that the scsi device is attached to
80289167
BK		 3211 *
3212 * LOCKING:
3213 * PCI/etc. bus probe sem.
3214 *
3215 * RETURNS:
3216 * ata_port pointer on success / NULL on failure.
3217 */
3218
cca3974e 3219struct ata_port *ata_sas_port_alloc(struct ata_host *host,
80289167 3220 struct ata_port_info *port_info,
cca3974e 3221 struct Scsi_Host *shost)
80289167
BK		 3222{
3223 struct ata_port *ap = kzalloc(sizeof(*ap), GFP_KERNEL);
3224 struct ata_probe_ent *ent;
3225
3226 if (!ap)
3227 return NULL;
3228
cca3974e 3229 ent = ata_probe_ent_alloc(host->dev, port_info);
80289167
BK		 3230 if (!ent) {
3231 kfree(ap);
3232 return NULL;
3233 }
3234
cca3974e
JG		 3235 ata_port_init(ap, host, ent, 0);
3236 ap->lock = shost->host_lock;
80289167
BK		 3237 kfree(ent);
3238 return ap;
3239}
3240EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3241
3242/**
3243 * ata_sas_port_start - Set port up for dma.
3244 * @ap: Port to initialize
3245 *
3246 * Called just after data structures for each port are
3247 * initialized. Allocates DMA pad.
3248 *
3249 * May be used as the port_start() entry in ata_port_operations.
3250 *
3251 * LOCKING:
3252 * Inherited from caller.
3253 */
3254int ata_sas_port_start(struct ata_port *ap)
3255{
3256 return ata_pad_alloc(ap, ap->dev);
3257}
3258EXPORT_SYMBOL_GPL(ata_sas_port_start);
3259
3260/**
3261 * ata_port_stop - Undo ata_sas_port_start()
3262 * @ap: Port to shut down
3263 *
3264 * Frees the DMA pad.
3265 *
3266 * May be used as the port_stop() entry in ata_port_operations.
3267 *
3268 * LOCKING:
3269 * Inherited from caller.
3270 */
3271
3272void ata_sas_port_stop(struct ata_port *ap)
3273{
3274 ata_pad_free(ap, ap->dev);
3275}
3276EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3277
3278/**
3279 * ata_sas_port_init - Initialize a SATA device
3280 * @ap: SATA port to initialize
3281 *
3282 * LOCKING:
3283 * PCI/etc. bus probe sem.
3284 *
3285 * RETURNS:
3286 * Zero on success, non-zero on error.
3287 */
3288
3289int ata_sas_port_init(struct ata_port *ap)
3290{
3291 int rc = ap->ops->port_start(ap);
3292
3293 if (!rc)
3294 rc = ata_bus_probe(ap);
3295
3296 return rc;
3297}
3298EXPORT_SYMBOL_GPL(ata_sas_port_init);
3299
3300/**
3301 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3302 * @ap: SATA port to destroy
3303 *
3304 */
3305
3306void ata_sas_port_destroy(struct ata_port *ap)
3307{
3308 ap->ops->port_stop(ap);
3309 kfree(ap);
3310}
3311EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3312
3313/**
3314 * ata_sas_slave_configure - Default slave_config routine for libata devices
3315 * @sdev: SCSI device to configure
3316 * @ap: ATA port to which SCSI device is attached
3317 *
3318 * RETURNS:
3319 * Zero.
3320 */
3321
3322int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
3323{
3324 ata_scsi_sdev_config(sdev);
3325 ata_scsi_dev_config(sdev, ap->device);
3326 return 0;
3327}
3328EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3329
3330/**
3331 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3332 * @cmd: SCSI command to be sent
3333 * @done: Completion function, called when command is complete
3334 * @ap: ATA port to which the command is being sent
3335 *
3336 * RETURNS:
08475a19
BK		 3337 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3338 * 0 otherwise.
80289167
BK		 3339 */
3340
3341int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
3342 struct ata_port *ap)
3343{
08475a19
BK		 3344 int rc = 0;
3345
80289167
BK		 3346 ata_scsi_dump_cdb(ap, cmd);
3347
3348 if (likely(ata_scsi_dev_enabled(ap->device)))
08475a19 3349 rc = __ata_scsi_queuecmd(cmd, done, ap->device);
80289167
BK		 3350 else {
3351 cmd->result = (DID_BAD_TARGET << 16);
3352 done(cmd);
3353 }
08475a19 3354 return rc;
80289167
BK		 3355}
3356EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
kernel source for telekom puls (alcatel/mediatek)