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