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libata-pmp-prep: implement sata_async_notification()
[GitHub/mt8127/android_kernel_alcatel_ttab.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[RW_RECOVERY_MPAGE_LEN] = {
75 RW_RECOVERY_MPAGE,
76 RW_RECOVERY_MPAGE_LEN - 2,
77 (1 << 7), /* AWRE */
78 0, /* read retry count */
79 0, 0, 0, 0,
80 0, /* write retry count */
81 0, 0, 0
82 };
83
84 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
85 CACHE_MPAGE,
86 CACHE_MPAGE_LEN - 2,
87 0, /* contains WCE, needs to be 0 for logic */
88 0, 0, 0, 0, 0, 0, 0, 0, 0,
89 0, /* contains DRA, needs to be 0 for logic */
90 0, 0, 0, 0, 0, 0, 0
91 };
92
93 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
94 CONTROL_MPAGE,
95 CONTROL_MPAGE_LEN - 2,
96 2, /* DSENSE=0, GLTSD=1 */
97 0, /* [QAM+QERR may be 1, see 05-359r1] */
98 0, 0, 0, 0, 0xff, 0xff,
99 0, 30 /* extended self test time, see 05-359r1 */
100 };
101
102 /*
103 * libata transport template. libata doesn't do real transport stuff.
104 * It just needs the eh_timed_out hook.
105 */
106 static struct scsi_transport_template ata_scsi_transport_template = {
107 .eh_strategy_handler = ata_scsi_error,
108 .eh_timed_out = ata_scsi_timed_out,
109 .user_scan = ata_scsi_user_scan,
110 };
111
112
113 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
114 void (*done)(struct scsi_cmnd *))
115 {
116 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
117 /* "Invalid field in cbd" */
118 done(cmd);
119 }
120
121 /**
122 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
123 * @sdev: SCSI device for which BIOS geometry is to be determined
124 * @bdev: block device associated with @sdev
125 * @capacity: capacity of SCSI device
126 * @geom: location to which geometry will be output
127 *
128 * Generic bios head/sector/cylinder calculator
129 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
130 * mapping. Some situations may arise where the disk is not
131 * bootable if this is not used.
132 *
133 * LOCKING:
134 * Defined by the SCSI layer. We don't really care.
135 *
136 * RETURNS:
137 * Zero.
138 */
139 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
140 sector_t capacity, int geom[])
141 {
142 geom[0] = 255;
143 geom[1] = 63;
144 sector_div(capacity, 255*63);
145 geom[2] = capacity;
146
147 return 0;
148 }
149
150 /**
151 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
152 * @sdev: SCSI device to get identify data for
153 * @arg: User buffer area for identify data
154 *
155 * LOCKING:
156 * Defined by the SCSI layer. We don't really care.
157 *
158 * RETURNS:
159 * Zero on success, negative errno on error.
160 */
161 static int ata_get_identity(struct scsi_device *sdev, void __user *arg)
162 {
163 struct ata_port *ap = ata_shost_to_port(sdev->host);
164 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
165 u16 __user *dst = arg;
166 char buf[40];
167
168 if (!dev)
169 return -ENOMSG;
170
171 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
172 return -EFAULT;
173
174 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
175 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
176 return -EFAULT;
177
178 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
179 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
180 return -EFAULT;
181
182 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
183 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
184 return -EFAULT;
185
186 return 0;
187 }
188
189 /**
190 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
191 * @scsidev: Device to which we are issuing command
192 * @arg: User provided data for issuing command
193 *
194 * LOCKING:
195 * Defined by the SCSI layer. We don't really care.
196 *
197 * RETURNS:
198 * Zero on success, negative errno on error.
199 */
200 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
201 {
202 int rc = 0;
203 u8 scsi_cmd[MAX_COMMAND_SIZE];
204 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
205 int argsize = 0;
206 enum dma_data_direction data_dir;
207 int cmd_result;
208
209 if (arg == NULL)
210 return -EINVAL;
211
212 if (copy_from_user(args, arg, sizeof(args)))
213 return -EFAULT;
214
215 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
216 if (!sensebuf)
217 return -ENOMEM;
218
219 memset(scsi_cmd, 0, sizeof(scsi_cmd));
220
221 if (args[3]) {
222 argsize = SECTOR_SIZE * args[3];
223 argbuf = kmalloc(argsize, GFP_KERNEL);
224 if (argbuf == NULL) {
225 rc = -ENOMEM;
226 goto error;
227 }
228
229 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
230 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
231 block count in sector count field */
232 data_dir = DMA_FROM_DEVICE;
233 } else {
234 scsi_cmd[1] = (3 << 1); /* Non-data */
235 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
236 data_dir = DMA_NONE;
237 }
238
239 scsi_cmd[0] = ATA_16;
240
241 scsi_cmd[4] = args[2];
242 if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */
243 scsi_cmd[6] = args[3];
244 scsi_cmd[8] = args[1];
245 scsi_cmd[10] = 0x4f;
246 scsi_cmd[12] = 0xc2;
247 } else {
248 scsi_cmd[6] = args[1];
249 }
250 scsi_cmd[14] = args[0];
251
252 /* Good values for timeout and retries? Values below
253 from scsi_ioctl_send_command() for default case... */
254 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
255 sensebuf, (10*HZ), 5, 0);
256
257 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
258 u8 *desc = sensebuf + 8;
259 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
260
261 /* If we set cc then ATA pass-through will cause a
262 * check condition even if no error. Filter that. */
263 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
264 struct scsi_sense_hdr sshdr;
265 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
266 &sshdr);
267 if (sshdr.sense_key==0 &&
268 sshdr.asc==0 && sshdr.ascq==0)
269 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
270 }
271
272 /* Send userspace a few ATA registers (same as drivers/ide) */
273 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
274 desc[0] == 0x09 ) { /* code is "ATA Descriptor" */
275 args[0] = desc[13]; /* status */
276 args[1] = desc[3]; /* error */
277 args[2] = desc[5]; /* sector count (0:7) */
278 if (copy_to_user(arg, args, sizeof(args)))
279 rc = -EFAULT;
280 }
281 }
282
283
284 if (cmd_result) {
285 rc = -EIO;
286 goto error;
287 }
288
289 if ((argbuf)
290 && copy_to_user(arg + sizeof(args), argbuf, argsize))
291 rc = -EFAULT;
292 error:
293 kfree(sensebuf);
294 kfree(argbuf);
295 return rc;
296 }
297
298 /**
299 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
300 * @scsidev: Device to which we are issuing command
301 * @arg: User provided data for issuing command
302 *
303 * LOCKING:
304 * Defined by the SCSI layer. We don't really care.
305 *
306 * RETURNS:
307 * Zero on success, negative errno on error.
308 */
309 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
310 {
311 int rc = 0;
312 u8 scsi_cmd[MAX_COMMAND_SIZE];
313 u8 args[7], *sensebuf = NULL;
314 int cmd_result;
315
316 if (arg == NULL)
317 return -EINVAL;
318
319 if (copy_from_user(args, arg, sizeof(args)))
320 return -EFAULT;
321
322 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
323 if (!sensebuf)
324 return -ENOMEM;
325
326 memset(scsi_cmd, 0, sizeof(scsi_cmd));
327 scsi_cmd[0] = ATA_16;
328 scsi_cmd[1] = (3 << 1); /* Non-data */
329 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
330 scsi_cmd[4] = args[1];
331 scsi_cmd[6] = args[2];
332 scsi_cmd[8] = args[3];
333 scsi_cmd[10] = args[4];
334 scsi_cmd[12] = args[5];
335 scsi_cmd[13] = args[6] & 0x4f;
336 scsi_cmd[14] = args[0];
337
338 /* Good values for timeout and retries? Values below
339 from scsi_ioctl_send_command() for default case... */
340 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
341 sensebuf, (10*HZ), 5, 0);
342
343 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
344 u8 *desc = sensebuf + 8;
345 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
346
347 /* If we set cc then ATA pass-through will cause a
348 * check condition even if no error. Filter that. */
349 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
350 struct scsi_sense_hdr sshdr;
351 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
352 &sshdr);
353 if (sshdr.sense_key==0 &&
354 sshdr.asc==0 && sshdr.ascq==0)
355 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
356 }
357
358 /* Send userspace ATA registers */
359 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
360 desc[0] == 0x09) {/* code is "ATA Descriptor" */
361 args[0] = desc[13]; /* status */
362 args[1] = desc[3]; /* error */
363 args[2] = desc[5]; /* sector count (0:7) */
364 args[3] = desc[7]; /* lbal */
365 args[4] = desc[9]; /* lbam */
366 args[5] = desc[11]; /* lbah */
367 args[6] = desc[12]; /* select */
368 if (copy_to_user(arg, args, sizeof(args)))
369 rc = -EFAULT;
370 }
371 }
372
373 if (cmd_result) {
374 rc = -EIO;
375 goto error;
376 }
377
378 error:
379 kfree(sensebuf);
380 return rc;
381 }
382
383 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
384 {
385 int val = -EINVAL, rc = -EINVAL;
386
387 switch (cmd) {
388 case ATA_IOC_GET_IO32:
389 val = 0;
390 if (copy_to_user(arg, &val, 1))
391 return -EFAULT;
392 return 0;
393
394 case ATA_IOC_SET_IO32:
395 val = (unsigned long) arg;
396 if (val != 0)
397 return -EINVAL;
398 return 0;
399
400 case HDIO_GET_IDENTITY:
401 return ata_get_identity(scsidev, arg);
402
403 case HDIO_DRIVE_CMD:
404 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
405 return -EACCES;
406 return ata_cmd_ioctl(scsidev, arg);
407
408 case HDIO_DRIVE_TASK:
409 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
410 return -EACCES;
411 return ata_task_ioctl(scsidev, arg);
412
413 default:
414 rc = -ENOTTY;
415 break;
416 }
417
418 return rc;
419 }
420
421 /**
422 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
423 * @dev: ATA device to which the new command is attached
424 * @cmd: SCSI command that originated this ATA command
425 * @done: SCSI command completion function
426 *
427 * Obtain a reference to an unused ata_queued_cmd structure,
428 * which is the basic libata structure representing a single
429 * ATA command sent to the hardware.
430 *
431 * If a command was available, fill in the SCSI-specific
432 * portions of the structure with information on the
433 * current command.
434 *
435 * LOCKING:
436 * spin_lock_irqsave(host lock)
437 *
438 * RETURNS:
439 * Command allocated, or %NULL if none available.
440 */
441 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
442 struct scsi_cmnd *cmd,
443 void (*done)(struct scsi_cmnd *))
444 {
445 struct ata_queued_cmd *qc;
446
447 qc = ata_qc_new_init(dev);
448 if (qc) {
449 qc->scsicmd = cmd;
450 qc->scsidone = done;
451
452 qc->__sg = scsi_sglist(cmd);
453 qc->n_elem = scsi_sg_count(cmd);
454 } else {
455 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
456 done(cmd);
457 }
458
459 return qc;
460 }
461
462 /**
463 * ata_dump_status - user friendly display of error info
464 * @id: id of the port in question
465 * @tf: ptr to filled out taskfile
466 *
467 * Decode and dump the ATA error/status registers for the user so
468 * that they have some idea what really happened at the non
469 * make-believe layer.
470 *
471 * LOCKING:
472 * inherited from caller
473 */
474 static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
475 {
476 u8 stat = tf->command, err = tf->feature;
477
478 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
479 if (stat & ATA_BUSY) {
480 printk("Busy }\n"); /* Data is not valid in this case */
481 } else {
482 if (stat & 0x40) printk("DriveReady ");
483 if (stat & 0x20) printk("DeviceFault ");
484 if (stat & 0x10) printk("SeekComplete ");
485 if (stat & 0x08) printk("DataRequest ");
486 if (stat & 0x04) printk("CorrectedError ");
487 if (stat & 0x02) printk("Index ");
488 if (stat & 0x01) printk("Error ");
489 printk("}\n");
490
491 if (err) {
492 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
493 if (err & 0x04) printk("DriveStatusError ");
494 if (err & 0x80) {
495 if (err & 0x04) printk("BadCRC ");
496 else printk("Sector ");
497 }
498 if (err & 0x40) printk("UncorrectableError ");
499 if (err & 0x10) printk("SectorIdNotFound ");
500 if (err & 0x02) printk("TrackZeroNotFound ");
501 if (err & 0x01) printk("AddrMarkNotFound ");
502 printk("}\n");
503 }
504 }
505 }
506
507 /**
508 * ata_to_sense_error - convert ATA error to SCSI error
509 * @id: ATA device number
510 * @drv_stat: value contained in ATA status register
511 * @drv_err: value contained in ATA error register
512 * @sk: the sense key we'll fill out
513 * @asc: the additional sense code we'll fill out
514 * @ascq: the additional sense code qualifier we'll fill out
515 * @verbose: be verbose
516 *
517 * Converts an ATA error into a SCSI error. Fill out pointers to
518 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
519 * format sense blocks.
520 *
521 * LOCKING:
522 * spin_lock_irqsave(host lock)
523 */
524 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
525 u8 *asc, u8 *ascq, int verbose)
526 {
527 int i;
528
529 /* Based on the 3ware driver translation table */
530 static const unsigned char sense_table[][4] = {
531 /* BBD|ECC|ID|MAR */
532 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
533 /* BBD|ECC|ID */
534 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
535 /* ECC|MC|MARK */
536 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
537 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
538 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
539 /* MC|ID|ABRT|TRK0|MARK */
540 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
541 /* MCR|MARK */
542 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
543 /* Bad address mark */
544 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
545 /* TRK0 */
546 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
547 /* Abort & !ICRC */
548 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
549 /* Media change request */
550 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
551 /* SRV */
552 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
553 /* Media change */
554 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
555 /* ECC */
556 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
557 /* BBD - block marked bad */
558 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
559 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
560 };
561 static const unsigned char stat_table[][4] = {
562 /* Must be first because BUSY means no other bits valid */
563 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
564 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
565 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
566 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
567 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
568 };
569
570 /*
571 * Is this an error we can process/parse
572 */
573 if (drv_stat & ATA_BUSY) {
574 drv_err = 0; /* Ignore the err bits, they're invalid */
575 }
576
577 if (drv_err) {
578 /* Look for drv_err */
579 for (i = 0; sense_table[i][0] != 0xFF; i++) {
580 /* Look for best matches first */
581 if ((sense_table[i][0] & drv_err) ==
582 sense_table[i][0]) {
583 *sk = sense_table[i][1];
584 *asc = sense_table[i][2];
585 *ascq = sense_table[i][3];
586 goto translate_done;
587 }
588 }
589 /* No immediate match */
590 if (verbose)
591 printk(KERN_WARNING "ata%u: no sense translation for "
592 "error 0x%02x\n", id, drv_err);
593 }
594
595 /* Fall back to interpreting status bits */
596 for (i = 0; stat_table[i][0] != 0xFF; i++) {
597 if (stat_table[i][0] & drv_stat) {
598 *sk = stat_table[i][1];
599 *asc = stat_table[i][2];
600 *ascq = stat_table[i][3];
601 goto translate_done;
602 }
603 }
604 /* No error? Undecoded? */
605 if (verbose)
606 printk(KERN_WARNING "ata%u: no sense translation for "
607 "status: 0x%02x\n", id, drv_stat);
608
609 /* We need a sensible error return here, which is tricky, and one
610 that won't cause people to do things like return a disk wrongly */
611 *sk = ABORTED_COMMAND;
612 *asc = 0x00;
613 *ascq = 0x00;
614
615 translate_done:
616 if (verbose)
617 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
618 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
619 id, drv_stat, drv_err, *sk, *asc, *ascq);
620 return;
621 }
622
623 /*
624 * ata_gen_passthru_sense - Generate check condition sense block.
625 * @qc: Command that completed.
626 *
627 * This function is specific to the ATA descriptor format sense
628 * block specified for the ATA pass through commands. Regardless
629 * of whether the command errored or not, return a sense
630 * block. Copy all controller registers into the sense
631 * block. Clear sense key, ASC & ASCQ if there is no error.
632 *
633 * LOCKING:
634 * None.
635 */
636 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
637 {
638 struct scsi_cmnd *cmd = qc->scsicmd;
639 struct ata_taskfile *tf = &qc->result_tf;
640 unsigned char *sb = cmd->sense_buffer;
641 unsigned char *desc = sb + 8;
642 int verbose = qc->ap->ops->error_handler == NULL;
643
644 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
645
646 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
647
648 /*
649 * Use ata_to_sense_error() to map status register bits
650 * onto sense key, asc & ascq.
651 */
652 if (qc->err_mask ||
653 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
654 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
655 &sb[1], &sb[2], &sb[3], verbose);
656 sb[1] &= 0x0f;
657 }
658
659 /*
660 * Sense data is current and format is descriptor.
661 */
662 sb[0] = 0x72;
663
664 desc[0] = 0x09;
665
666 /* set length of additional sense data */
667 sb[7] = 14;
668 desc[1] = 12;
669
670 /*
671 * Copy registers into sense buffer.
672 */
673 desc[2] = 0x00;
674 desc[3] = tf->feature; /* == error reg */
675 desc[5] = tf->nsect;
676 desc[7] = tf->lbal;
677 desc[9] = tf->lbam;
678 desc[11] = tf->lbah;
679 desc[12] = tf->device;
680 desc[13] = tf->command; /* == status reg */
681
682 /*
683 * Fill in Extend bit, and the high order bytes
684 * if applicable.
685 */
686 if (tf->flags & ATA_TFLAG_LBA48) {
687 desc[2] |= 0x01;
688 desc[4] = tf->hob_nsect;
689 desc[6] = tf->hob_lbal;
690 desc[8] = tf->hob_lbam;
691 desc[10] = tf->hob_lbah;
692 }
693 }
694
695 /**
696 * ata_gen_ata_sense - generate a SCSI fixed sense block
697 * @qc: Command that we are erroring out
698 *
699 * Generate sense block for a failed ATA command @qc. Descriptor
700 * format is used to accomodate LBA48 block address.
701 *
702 * LOCKING:
703 * None.
704 */
705 static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
706 {
707 struct ata_device *dev = qc->dev;
708 struct scsi_cmnd *cmd = qc->scsicmd;
709 struct ata_taskfile *tf = &qc->result_tf;
710 unsigned char *sb = cmd->sense_buffer;
711 unsigned char *desc = sb + 8;
712 int verbose = qc->ap->ops->error_handler == NULL;
713 u64 block;
714
715 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
716
717 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
718
719 /* sense data is current and format is descriptor */
720 sb[0] = 0x72;
721
722 /* Use ata_to_sense_error() to map status register bits
723 * onto sense key, asc & ascq.
724 */
725 if (qc->err_mask ||
726 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
727 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
728 &sb[1], &sb[2], &sb[3], verbose);
729 sb[1] &= 0x0f;
730 }
731
732 block = ata_tf_read_block(&qc->result_tf, dev);
733
734 /* information sense data descriptor */
735 sb[7] = 12;
736 desc[0] = 0x00;
737 desc[1] = 10;
738
739 desc[2] |= 0x80; /* valid */
740 desc[6] = block >> 40;
741 desc[7] = block >> 32;
742 desc[8] = block >> 24;
743 desc[9] = block >> 16;
744 desc[10] = block >> 8;
745 desc[11] = block;
746 }
747
748 static void ata_scsi_sdev_config(struct scsi_device *sdev)
749 {
750 sdev->use_10_for_rw = 1;
751 sdev->use_10_for_ms = 1;
752
753 /* Schedule policy is determined by ->qc_defer() callback and
754 * it needs to see every deferred qc. Set dev_blocked to 1 to
755 * prevent SCSI midlayer from automatically deferring
756 * requests.
757 */
758 sdev->max_device_blocked = 1;
759 }
760
761 static void ata_scsi_dev_config(struct scsi_device *sdev,
762 struct ata_device *dev)
763 {
764 /* configure max sectors */
765 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);
766
767 /* SATA DMA transfers must be multiples of 4 byte, so
768 * we need to pad ATAPI transfers using an extra sg.
769 * Decrement max hw segments accordingly.
770 */
771 if (dev->class == ATA_DEV_ATAPI) {
772 struct request_queue *q = sdev->request_queue;
773 blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
774 }
775
776 if (dev->flags & ATA_DFLAG_NCQ) {
777 int depth;
778
779 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
780 depth = min(ATA_MAX_QUEUE - 1, depth);
781 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
782 }
783 }
784
785 /**
786 * ata_scsi_slave_config - Set SCSI device attributes
787 * @sdev: SCSI device to examine
788 *
789 * This is called before we actually start reading
790 * and writing to the device, to configure certain
791 * SCSI mid-layer behaviors.
792 *
793 * LOCKING:
794 * Defined by SCSI layer. We don't really care.
795 */
796
797 int ata_scsi_slave_config(struct scsi_device *sdev)
798 {
799 struct ata_port *ap = ata_shost_to_port(sdev->host);
800 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
801
802 ata_scsi_sdev_config(sdev);
803
804 blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);
805
806 sdev->manage_start_stop = 1;
807
808 if (dev)
809 ata_scsi_dev_config(sdev, dev);
810
811 return 0; /* scsi layer doesn't check return value, sigh */
812 }
813
814 /**
815 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
816 * @sdev: SCSI device to be destroyed
817 *
818 * @sdev is about to be destroyed for hot/warm unplugging. If
819 * this unplugging was initiated by libata as indicated by NULL
820 * dev->sdev, this function doesn't have to do anything.
821 * Otherwise, SCSI layer initiated warm-unplug is in progress.
822 * Clear dev->sdev, schedule the device for ATA detach and invoke
823 * EH.
824 *
825 * LOCKING:
826 * Defined by SCSI layer. We don't really care.
827 */
828 void ata_scsi_slave_destroy(struct scsi_device *sdev)
829 {
830 struct ata_port *ap = ata_shost_to_port(sdev->host);
831 unsigned long flags;
832 struct ata_device *dev;
833
834 if (!ap->ops->error_handler)
835 return;
836
837 spin_lock_irqsave(ap->lock, flags);
838 dev = __ata_scsi_find_dev(ap, sdev);
839 if (dev && dev->sdev) {
840 /* SCSI device already in CANCEL state, no need to offline it */
841 dev->sdev = NULL;
842 dev->flags |= ATA_DFLAG_DETACH;
843 ata_port_schedule_eh(ap);
844 }
845 spin_unlock_irqrestore(ap->lock, flags);
846 }
847
848 /**
849 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
850 * @sdev: SCSI device to configure queue depth for
851 * @queue_depth: new queue depth
852 *
853 * This is libata standard hostt->change_queue_depth callback.
854 * SCSI will call into this callback when user tries to set queue
855 * depth via sysfs.
856 *
857 * LOCKING:
858 * SCSI layer (we don't care)
859 *
860 * RETURNS:
861 * Newly configured queue depth.
862 */
863 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
864 {
865 struct ata_port *ap = ata_shost_to_port(sdev->host);
866 struct ata_device *dev;
867 unsigned long flags;
868
869 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
870 return sdev->queue_depth;
871
872 dev = ata_scsi_find_dev(ap, sdev);
873 if (!dev || !ata_dev_enabled(dev))
874 return sdev->queue_depth;
875
876 /* NCQ enabled? */
877 spin_lock_irqsave(ap->lock, flags);
878 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
879 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
880 dev->flags |= ATA_DFLAG_NCQ_OFF;
881 queue_depth = 1;
882 }
883 spin_unlock_irqrestore(ap->lock, flags);
884
885 /* limit and apply queue depth */
886 queue_depth = min(queue_depth, sdev->host->can_queue);
887 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
888 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
889
890 if (sdev->queue_depth == queue_depth)
891 return -EINVAL;
892
893 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
894 return queue_depth;
895 }
896
897 /* XXX: for spindown warning */
898 static void ata_delayed_done_timerfn(unsigned long arg)
899 {
900 struct scsi_cmnd *scmd = (void *)arg;
901
902 scmd->scsi_done(scmd);
903 }
904
905 /* XXX: for spindown warning */
906 static void ata_delayed_done(struct scsi_cmnd *scmd)
907 {
908 static struct timer_list timer;
909
910 setup_timer(&timer, ata_delayed_done_timerfn, (unsigned long)scmd);
911 mod_timer(&timer, jiffies + 5 * HZ);
912 }
913
914 /**
915 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
916 * @qc: Storage for translated ATA taskfile
917 *
918 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
919 * (to start). Perhaps these commands should be preceded by
920 * CHECK POWER MODE to see what power mode the device is already in.
921 * [See SAT revision 5 at www.t10.org]
922 *
923 * LOCKING:
924 * spin_lock_irqsave(host lock)
925 *
926 * RETURNS:
927 * Zero on success, non-zero on error.
928 */
929 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
930 {
931 struct scsi_cmnd *scmd = qc->scsicmd;
932 struct ata_taskfile *tf = &qc->tf;
933 const u8 *cdb = scmd->cmnd;
934
935 if (scmd->cmd_len < 5)
936 goto invalid_fld;
937
938 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
939 tf->protocol = ATA_PROT_NODATA;
940 if (cdb[1] & 0x1) {
941 ; /* ignore IMMED bit, violates sat-r05 */
942 }
943 if (cdb[4] & 0x2)
944 goto invalid_fld; /* LOEJ bit set not supported */
945 if (((cdb[4] >> 4) & 0xf) != 0)
946 goto invalid_fld; /* power conditions not supported */
947
948 if (qc->dev->horkage & ATA_HORKAGE_SKIP_PM) {
949 /* the device lacks PM support, finish without doing anything */
950 scmd->result = SAM_STAT_GOOD;
951 return 1;
952 }
953
954 if (cdb[4] & 0x1) {
955 tf->nsect = 1; /* 1 sector, lba=0 */
956
957 if (qc->dev->flags & ATA_DFLAG_LBA) {
958 tf->flags |= ATA_TFLAG_LBA;
959
960 tf->lbah = 0x0;
961 tf->lbam = 0x0;
962 tf->lbal = 0x0;
963 tf->device |= ATA_LBA;
964 } else {
965 /* CHS */
966 tf->lbal = 0x1; /* sect */
967 tf->lbam = 0x0; /* cyl low */
968 tf->lbah = 0x0; /* cyl high */
969 }
970
971 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
972 } else {
973 /* XXX: This is for backward compatibility, will be
974 * removed. Read Documentation/feature-removal-schedule.txt
975 * for more info.
976 */
977 if ((qc->dev->flags & ATA_DFLAG_SPUNDOWN) &&
978 (system_state == SYSTEM_HALT ||
979 system_state == SYSTEM_POWER_OFF)) {
980 static unsigned long warned = 0;
981
982 if (!test_and_set_bit(0, &warned)) {
983 ata_dev_printk(qc->dev, KERN_WARNING,
984 "DISK MIGHT NOT BE SPUN DOWN PROPERLY. "
985 "UPDATE SHUTDOWN UTILITY\n");
986 ata_dev_printk(qc->dev, KERN_WARNING,
987 "For more info, visit "
988 "http://linux-ata.org/shutdown.html\n");
989
990 /* ->scsi_done is not used, use it for
991 * delayed completion.
992 */
993 scmd->scsi_done = qc->scsidone;
994 qc->scsidone = ata_delayed_done;
995 }
996 scmd->result = SAM_STAT_GOOD;
997 return 1;
998 }
999
1000 /* Issue ATA STANDBY IMMEDIATE command */
1001 tf->command = ATA_CMD_STANDBYNOW1;
1002 }
1003
1004 /*
1005 * Standby and Idle condition timers could be implemented but that
1006 * would require libata to implement the Power condition mode page
1007 * and allow the user to change it. Changing mode pages requires
1008 * MODE SELECT to be implemented.
1009 */
1010
1011 return 0;
1012
1013 invalid_fld:
1014 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1015 /* "Invalid field in cbd" */
1016 return 1;
1017 }
1018
1019
1020 /**
1021 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1022 * @qc: Storage for translated ATA taskfile
1023 *
1024 * Sets up an ATA taskfile to issue FLUSH CACHE or
1025 * FLUSH CACHE EXT.
1026 *
1027 * LOCKING:
1028 * spin_lock_irqsave(host lock)
1029 *
1030 * RETURNS:
1031 * Zero on success, non-zero on error.
1032 */
1033 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1034 {
1035 struct ata_taskfile *tf = &qc->tf;
1036
1037 tf->flags |= ATA_TFLAG_DEVICE;
1038 tf->protocol = ATA_PROT_NODATA;
1039
1040 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1041 tf->command = ATA_CMD_FLUSH_EXT;
1042 else
1043 tf->command = ATA_CMD_FLUSH;
1044
1045 return 0;
1046 }
1047
1048 /**
1049 * scsi_6_lba_len - Get LBA and transfer length
1050 * @cdb: SCSI command to translate
1051 *
1052 * Calculate LBA and transfer length for 6-byte commands.
1053 *
1054 * RETURNS:
1055 * @plba: the LBA
1056 * @plen: the transfer length
1057 */
1058 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1059 {
1060 u64 lba = 0;
1061 u32 len;
1062
1063 VPRINTK("six-byte command\n");
1064
1065 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1066 lba |= ((u64)cdb[2]) << 8;
1067 lba |= ((u64)cdb[3]);
1068
1069 len = cdb[4];
1070
1071 *plba = lba;
1072 *plen = len;
1073 }
1074
1075 /**
1076 * scsi_10_lba_len - Get LBA and transfer length
1077 * @cdb: SCSI command to translate
1078 *
1079 * Calculate LBA and transfer length for 10-byte commands.
1080 *
1081 * RETURNS:
1082 * @plba: the LBA
1083 * @plen: the transfer length
1084 */
1085 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1086 {
1087 u64 lba = 0;
1088 u32 len = 0;
1089
1090 VPRINTK("ten-byte command\n");
1091
1092 lba |= ((u64)cdb[2]) << 24;
1093 lba |= ((u64)cdb[3]) << 16;
1094 lba |= ((u64)cdb[4]) << 8;
1095 lba |= ((u64)cdb[5]);
1096
1097 len |= ((u32)cdb[7]) << 8;
1098 len |= ((u32)cdb[8]);
1099
1100 *plba = lba;
1101 *plen = len;
1102 }
1103
1104 /**
1105 * scsi_16_lba_len - Get LBA and transfer length
1106 * @cdb: SCSI command to translate
1107 *
1108 * Calculate LBA and transfer length for 16-byte commands.
1109 *
1110 * RETURNS:
1111 * @plba: the LBA
1112 * @plen: the transfer length
1113 */
1114 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1115 {
1116 u64 lba = 0;
1117 u32 len = 0;
1118
1119 VPRINTK("sixteen-byte command\n");
1120
1121 lba |= ((u64)cdb[2]) << 56;
1122 lba |= ((u64)cdb[3]) << 48;
1123 lba |= ((u64)cdb[4]) << 40;
1124 lba |= ((u64)cdb[5]) << 32;
1125 lba |= ((u64)cdb[6]) << 24;
1126 lba |= ((u64)cdb[7]) << 16;
1127 lba |= ((u64)cdb[8]) << 8;
1128 lba |= ((u64)cdb[9]);
1129
1130 len |= ((u32)cdb[10]) << 24;
1131 len |= ((u32)cdb[11]) << 16;
1132 len |= ((u32)cdb[12]) << 8;
1133 len |= ((u32)cdb[13]);
1134
1135 *plba = lba;
1136 *plen = len;
1137 }
1138
1139 /**
1140 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1141 * @qc: Storage for translated ATA taskfile
1142 *
1143 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1144 *
1145 * LOCKING:
1146 * spin_lock_irqsave(host lock)
1147 *
1148 * RETURNS:
1149 * Zero on success, non-zero on error.
1150 */
1151 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1152 {
1153 struct scsi_cmnd *scmd = qc->scsicmd;
1154 struct ata_taskfile *tf = &qc->tf;
1155 struct ata_device *dev = qc->dev;
1156 u64 dev_sectors = qc->dev->n_sectors;
1157 const u8 *cdb = scmd->cmnd;
1158 u64 block;
1159 u32 n_block;
1160
1161 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1162 tf->protocol = ATA_PROT_NODATA;
1163
1164 if (cdb[0] == VERIFY) {
1165 if (scmd->cmd_len < 10)
1166 goto invalid_fld;
1167 scsi_10_lba_len(cdb, &block, &n_block);
1168 } else if (cdb[0] == VERIFY_16) {
1169 if (scmd->cmd_len < 16)
1170 goto invalid_fld;
1171 scsi_16_lba_len(cdb, &block, &n_block);
1172 } else
1173 goto invalid_fld;
1174
1175 if (!n_block)
1176 goto nothing_to_do;
1177 if (block >= dev_sectors)
1178 goto out_of_range;
1179 if ((block + n_block) > dev_sectors)
1180 goto out_of_range;
1181
1182 if (dev->flags & ATA_DFLAG_LBA) {
1183 tf->flags |= ATA_TFLAG_LBA;
1184
1185 if (lba_28_ok(block, n_block)) {
1186 /* use LBA28 */
1187 tf->command = ATA_CMD_VERIFY;
1188 tf->device |= (block >> 24) & 0xf;
1189 } else if (lba_48_ok(block, n_block)) {
1190 if (!(dev->flags & ATA_DFLAG_LBA48))
1191 goto out_of_range;
1192
1193 /* use LBA48 */
1194 tf->flags |= ATA_TFLAG_LBA48;
1195 tf->command = ATA_CMD_VERIFY_EXT;
1196
1197 tf->hob_nsect = (n_block >> 8) & 0xff;
1198
1199 tf->hob_lbah = (block >> 40) & 0xff;
1200 tf->hob_lbam = (block >> 32) & 0xff;
1201 tf->hob_lbal = (block >> 24) & 0xff;
1202 } else
1203 /* request too large even for LBA48 */
1204 goto out_of_range;
1205
1206 tf->nsect = n_block & 0xff;
1207
1208 tf->lbah = (block >> 16) & 0xff;
1209 tf->lbam = (block >> 8) & 0xff;
1210 tf->lbal = block & 0xff;
1211
1212 tf->device |= ATA_LBA;
1213 } else {
1214 /* CHS */
1215 u32 sect, head, cyl, track;
1216
1217 if (!lba_28_ok(block, n_block))
1218 goto out_of_range;
1219
1220 /* Convert LBA to CHS */
1221 track = (u32)block / dev->sectors;
1222 cyl = track / dev->heads;
1223 head = track % dev->heads;
1224 sect = (u32)block % dev->sectors + 1;
1225
1226 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1227 (u32)block, track, cyl, head, sect);
1228
1229 /* Check whether the converted CHS can fit.
1230 Cylinder: 0-65535
1231 Head: 0-15
1232 Sector: 1-255*/
1233 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1234 goto out_of_range;
1235
1236 tf->command = ATA_CMD_VERIFY;
1237 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1238 tf->lbal = sect;
1239 tf->lbam = cyl;
1240 tf->lbah = cyl >> 8;
1241 tf->device |= head;
1242 }
1243
1244 return 0;
1245
1246 invalid_fld:
1247 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1248 /* "Invalid field in cbd" */
1249 return 1;
1250
1251 out_of_range:
1252 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1253 /* "Logical Block Address out of range" */
1254 return 1;
1255
1256 nothing_to_do:
1257 scmd->result = SAM_STAT_GOOD;
1258 return 1;
1259 }
1260
1261 /**
1262 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1263 * @qc: Storage for translated ATA taskfile
1264 *
1265 * Converts any of six SCSI read/write commands into the
1266 * ATA counterpart, including starting sector (LBA),
1267 * sector count, and taking into account the device's LBA48
1268 * support.
1269 *
1270 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1271 * %WRITE_16 are currently supported.
1272 *
1273 * LOCKING:
1274 * spin_lock_irqsave(host lock)
1275 *
1276 * RETURNS:
1277 * Zero on success, non-zero on error.
1278 */
1279 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1280 {
1281 struct scsi_cmnd *scmd = qc->scsicmd;
1282 const u8 *cdb = scmd->cmnd;
1283 unsigned int tf_flags = 0;
1284 u64 block;
1285 u32 n_block;
1286 int rc;
1287
1288 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1289 tf_flags |= ATA_TFLAG_WRITE;
1290
1291 /* Calculate the SCSI LBA, transfer length and FUA. */
1292 switch (cdb[0]) {
1293 case READ_10:
1294 case WRITE_10:
1295 if (unlikely(scmd->cmd_len < 10))
1296 goto invalid_fld;
1297 scsi_10_lba_len(cdb, &block, &n_block);
1298 if (unlikely(cdb[1] & (1 << 3)))
1299 tf_flags |= ATA_TFLAG_FUA;
1300 break;
1301 case READ_6:
1302 case WRITE_6:
1303 if (unlikely(scmd->cmd_len < 6))
1304 goto invalid_fld;
1305 scsi_6_lba_len(cdb, &block, &n_block);
1306
1307 /* for 6-byte r/w commands, transfer length 0
1308 * means 256 blocks of data, not 0 block.
1309 */
1310 if (!n_block)
1311 n_block = 256;
1312 break;
1313 case READ_16:
1314 case WRITE_16:
1315 if (unlikely(scmd->cmd_len < 16))
1316 goto invalid_fld;
1317 scsi_16_lba_len(cdb, &block, &n_block);
1318 if (unlikely(cdb[1] & (1 << 3)))
1319 tf_flags |= ATA_TFLAG_FUA;
1320 break;
1321 default:
1322 DPRINTK("no-byte command\n");
1323 goto invalid_fld;
1324 }
1325
1326 /* Check and compose ATA command */
1327 if (!n_block)
1328 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1329 * length 0 means transfer 0 block of data.
1330 * However, for ATA R/W commands, sector count 0 means
1331 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1332 *
1333 * WARNING: one or two older ATA drives treat 0 as 0...
1334 */
1335 goto nothing_to_do;
1336
1337 qc->flags |= ATA_QCFLAG_IO;
1338 qc->nbytes = n_block * ATA_SECT_SIZE;
1339
1340 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1341 qc->tag);
1342 if (likely(rc == 0))
1343 return 0;
1344
1345 if (rc == -ERANGE)
1346 goto out_of_range;
1347 /* treat all other errors as -EINVAL, fall through */
1348 invalid_fld:
1349 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1350 /* "Invalid field in cbd" */
1351 return 1;
1352
1353 out_of_range:
1354 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1355 /* "Logical Block Address out of range" */
1356 return 1;
1357
1358 nothing_to_do:
1359 scmd->result = SAM_STAT_GOOD;
1360 return 1;
1361 }
1362
1363 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1364 {
1365 struct ata_port *ap = qc->ap;
1366 struct scsi_cmnd *cmd = qc->scsicmd;
1367 u8 *cdb = cmd->cmnd;
1368 int need_sense = (qc->err_mask != 0);
1369
1370 /* We snoop the SET_FEATURES - Write Cache ON/OFF command, and
1371 * schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE
1372 * cache
1373 */
1374 if (ap->ops->error_handler && !need_sense) {
1375 switch (qc->tf.command) {
1376 case ATA_CMD_SET_FEATURES:
1377 if ((qc->tf.feature == SETFEATURES_WC_ON) ||
1378 (qc->tf.feature == SETFEATURES_WC_OFF)) {
1379 ap->link.eh_info.action |= ATA_EH_REVALIDATE;
1380 ata_port_schedule_eh(ap);
1381 }
1382 break;
1383
1384 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
1385 case ATA_CMD_SET_MULTI: /* multi_count changed */
1386 ap->link.eh_info.action |= ATA_EH_REVALIDATE;
1387 ata_port_schedule_eh(ap);
1388 break;
1389 }
1390 }
1391
1392 /* For ATA pass thru (SAT) commands, generate a sense block if
1393 * user mandated it or if there's an error. Note that if we
1394 * generate because the user forced us to, a check condition
1395 * is generated and the ATA register values are returned
1396 * whether the command completed successfully or not. If there
1397 * was no error, SK, ASC and ASCQ will all be zero.
1398 */
1399 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1400 ((cdb[2] & 0x20) || need_sense)) {
1401 ata_gen_passthru_sense(qc);
1402 } else {
1403 if (!need_sense) {
1404 cmd->result = SAM_STAT_GOOD;
1405 } else {
1406 /* TODO: decide which descriptor format to use
1407 * for 48b LBA devices and call that here
1408 * instead of the fixed desc, which is only
1409 * good for smaller LBA (and maybe CHS?)
1410 * devices.
1411 */
1412 ata_gen_ata_sense(qc);
1413 }
1414 }
1415
1416 /* XXX: track spindown state for spindown skipping and warning */
1417 if (unlikely(qc->tf.command == ATA_CMD_STANDBY ||
1418 qc->tf.command == ATA_CMD_STANDBYNOW1))
1419 qc->dev->flags |= ATA_DFLAG_SPUNDOWN;
1420 else if (likely(system_state != SYSTEM_HALT &&
1421 system_state != SYSTEM_POWER_OFF))
1422 qc->dev->flags &= ~ATA_DFLAG_SPUNDOWN;
1423
1424 if (need_sense && !ap->ops->error_handler)
1425 ata_dump_status(ap->print_id, &qc->result_tf);
1426
1427 qc->scsidone(cmd);
1428
1429 ata_qc_free(qc);
1430 }
1431
1432 /**
1433 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1434 * @dev: ATA device to which the command is addressed
1435 * @cmd: SCSI command to execute
1436 * @done: SCSI command completion function
1437 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1438 *
1439 * Our ->queuecommand() function has decided that the SCSI
1440 * command issued can be directly translated into an ATA
1441 * command, rather than handled internally.
1442 *
1443 * This function sets up an ata_queued_cmd structure for the
1444 * SCSI command, and sends that ata_queued_cmd to the hardware.
1445 *
1446 * The xlat_func argument (actor) returns 0 if ready to execute
1447 * ATA command, else 1 to finish translation. If 1 is returned
1448 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1449 * to be set reflecting an error condition or clean (early)
1450 * termination.
1451 *
1452 * LOCKING:
1453 * spin_lock_irqsave(host lock)
1454 *
1455 * RETURNS:
1456 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1457 * needs to be deferred.
1458 */
1459 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1460 void (*done)(struct scsi_cmnd *),
1461 ata_xlat_func_t xlat_func)
1462 {
1463 struct ata_port *ap = dev->link->ap;
1464 struct ata_queued_cmd *qc;
1465 int rc;
1466
1467 VPRINTK("ENTER\n");
1468
1469 qc = ata_scsi_qc_new(dev, cmd, done);
1470 if (!qc)
1471 goto err_mem;
1472
1473 /* data is present; dma-map it */
1474 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1475 cmd->sc_data_direction == DMA_TO_DEVICE) {
1476 if (unlikely(scsi_bufflen(cmd) < 1)) {
1477 ata_dev_printk(dev, KERN_WARNING,
1478 "WARNING: zero len r/w req\n");
1479 goto err_did;
1480 }
1481
1482 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1483
1484 qc->dma_dir = cmd->sc_data_direction;
1485 }
1486
1487 qc->complete_fn = ata_scsi_qc_complete;
1488
1489 if (xlat_func(qc))
1490 goto early_finish;
1491
1492 if (ap->ops->qc_defer) {
1493 if ((rc = ap->ops->qc_defer(qc)))
1494 goto defer;
1495 }
1496
1497 /* select device, send command to hardware */
1498 ata_qc_issue(qc);
1499
1500 VPRINTK("EXIT\n");
1501 return 0;
1502
1503 early_finish:
1504 ata_qc_free(qc);
1505 qc->scsidone(cmd);
1506 DPRINTK("EXIT - early finish (good or error)\n");
1507 return 0;
1508
1509 err_did:
1510 ata_qc_free(qc);
1511 cmd->result = (DID_ERROR << 16);
1512 qc->scsidone(cmd);
1513 err_mem:
1514 DPRINTK("EXIT - internal\n");
1515 return 0;
1516
1517 defer:
1518 ata_qc_free(qc);
1519 DPRINTK("EXIT - defer\n");
1520 if (rc == ATA_DEFER_LINK)
1521 return SCSI_MLQUEUE_DEVICE_BUSY;
1522 else
1523 return SCSI_MLQUEUE_HOST_BUSY;
1524 }
1525
1526 /**
1527 * ata_scsi_rbuf_get - Map response buffer.
1528 * @cmd: SCSI command containing buffer to be mapped.
1529 * @buf_out: Pointer to mapped area.
1530 *
1531 * Maps buffer contained within SCSI command @cmd.
1532 *
1533 * LOCKING:
1534 * spin_lock_irqsave(host lock)
1535 *
1536 * RETURNS:
1537 * Length of response buffer.
1538 */
1539
1540 static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
1541 {
1542 u8 *buf;
1543 unsigned int buflen;
1544
1545 struct scatterlist *sg = scsi_sglist(cmd);
1546
1547 if (sg) {
1548 buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
1549 buflen = sg->length;
1550 } else {
1551 buf = NULL;
1552 buflen = 0;
1553 }
1554
1555 *buf_out = buf;
1556 return buflen;
1557 }
1558
1559 /**
1560 * ata_scsi_rbuf_put - Unmap response buffer.
1561 * @cmd: SCSI command containing buffer to be unmapped.
1562 * @buf: buffer to unmap
1563 *
1564 * Unmaps response buffer contained within @cmd.
1565 *
1566 * LOCKING:
1567 * spin_lock_irqsave(host lock)
1568 */
1569
1570 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
1571 {
1572 struct scatterlist *sg = scsi_sglist(cmd);
1573 if (sg)
1574 kunmap_atomic(buf - sg->offset, KM_IRQ0);
1575 }
1576
1577 /**
1578 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1579 * @args: device IDENTIFY data / SCSI command of interest.
1580 * @actor: Callback hook for desired SCSI command simulator
1581 *
1582 * Takes care of the hard work of simulating a SCSI command...
1583 * Mapping the response buffer, calling the command's handler,
1584 * and handling the handler's return value. This return value
1585 * indicates whether the handler wishes the SCSI command to be
1586 * completed successfully (0), or not (in which case cmd->result
1587 * and sense buffer are assumed to be set).
1588 *
1589 * LOCKING:
1590 * spin_lock_irqsave(host lock)
1591 */
1592
1593 void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1594 unsigned int (*actor) (struct ata_scsi_args *args,
1595 u8 *rbuf, unsigned int buflen))
1596 {
1597 u8 *rbuf;
1598 unsigned int buflen, rc;
1599 struct scsi_cmnd *cmd = args->cmd;
1600
1601 buflen = ata_scsi_rbuf_get(cmd, &rbuf);
1602 memset(rbuf, 0, buflen);
1603 rc = actor(args, rbuf, buflen);
1604 ata_scsi_rbuf_put(cmd, rbuf);
1605
1606 if (rc == 0)
1607 cmd->result = SAM_STAT_GOOD;
1608 args->done(cmd);
1609 }
1610
1611 /**
1612 * ATA_SCSI_RBUF_SET - helper to set values in SCSI response buffer
1613 * @idx: byte index into SCSI response buffer
1614 * @val: value to set
1615 *
1616 * To be used by SCSI command simulator functions. This macros
1617 * expects two local variables, u8 *rbuf and unsigned int buflen,
1618 * are in scope.
1619 *
1620 * LOCKING:
1621 * None.
1622 */
1623 #define ATA_SCSI_RBUF_SET(idx, val) do { \
1624 if ((idx) < buflen) rbuf[(idx)] = (u8)(val); \
1625 } while (0)
1626
1627 /**
1628 * ata_scsiop_inq_std - Simulate INQUIRY command
1629 * @args: device IDENTIFY data / SCSI command of interest.
1630 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1631 * @buflen: Response buffer length.
1632 *
1633 * Returns standard device identification data associated
1634 * with non-VPD INQUIRY command output.
1635 *
1636 * LOCKING:
1637 * spin_lock_irqsave(host lock)
1638 */
1639
1640 unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
1641 unsigned int buflen)
1642 {
1643 u8 hdr[] = {
1644 TYPE_DISK,
1645 0,
1646 0x5, /* claim SPC-3 version compatibility */
1647 2,
1648 95 - 4
1649 };
1650
1651 /* set scsi removeable (RMB) bit per ata bit */
1652 if (ata_id_removeable(args->id))
1653 hdr[1] |= (1 << 7);
1654
1655 VPRINTK("ENTER\n");
1656
1657 memcpy(rbuf, hdr, sizeof(hdr));
1658
1659 if (buflen > 35) {
1660 memcpy(&rbuf[8], "ATA ", 8);
1661 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1662 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1663 if (rbuf[32] == 0 || rbuf[32] == ' ')
1664 memcpy(&rbuf[32], "n/a ", 4);
1665 }
1666
1667 if (buflen > 63) {
1668 const u8 versions[] = {
1669 0x60, /* SAM-3 (no version claimed) */
1670
1671 0x03,
1672 0x20, /* SBC-2 (no version claimed) */
1673
1674 0x02,
1675 0x60 /* SPC-3 (no version claimed) */
1676 };
1677
1678 memcpy(rbuf + 59, versions, sizeof(versions));
1679 }
1680
1681 return 0;
1682 }
1683
1684 /**
1685 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1686 * @args: device IDENTIFY data / SCSI command of interest.
1687 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1688 * @buflen: Response buffer length.
1689 *
1690 * Returns list of inquiry VPD pages available.
1691 *
1692 * LOCKING:
1693 * spin_lock_irqsave(host lock)
1694 */
1695
1696 unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
1697 unsigned int buflen)
1698 {
1699 const u8 pages[] = {
1700 0x00, /* page 0x00, this page */
1701 0x80, /* page 0x80, unit serial no page */
1702 0x83 /* page 0x83, device ident page */
1703 };
1704 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
1705
1706 if (buflen > 6)
1707 memcpy(rbuf + 4, pages, sizeof(pages));
1708
1709 return 0;
1710 }
1711
1712 /**
1713 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1714 * @args: device IDENTIFY data / SCSI command of interest.
1715 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1716 * @buflen: Response buffer length.
1717 *
1718 * Returns ATA device serial number.
1719 *
1720 * LOCKING:
1721 * spin_lock_irqsave(host lock)
1722 */
1723
1724 unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
1725 unsigned int buflen)
1726 {
1727 const u8 hdr[] = {
1728 0,
1729 0x80, /* this page code */
1730 0,
1731 ATA_ID_SERNO_LEN, /* page len */
1732 };
1733 memcpy(rbuf, hdr, sizeof(hdr));
1734
1735 if (buflen > (ATA_ID_SERNO_LEN + 4 - 1))
1736 ata_id_string(args->id, (unsigned char *) &rbuf[4],
1737 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1738
1739 return 0;
1740 }
1741
1742 /**
1743 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1744 * @args: device IDENTIFY data / SCSI command of interest.
1745 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1746 * @buflen: Response buffer length.
1747 *
1748 * Yields two logical unit device identification designators:
1749 * - vendor specific ASCII containing the ATA serial number
1750 * - SAT defined "t10 vendor id based" containing ASCII vendor
1751 * name ("ATA "), model and serial numbers.
1752 *
1753 * LOCKING:
1754 * spin_lock_irqsave(host lock)
1755 */
1756
1757 unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
1758 unsigned int buflen)
1759 {
1760 int num;
1761 const int sat_model_serial_desc_len = 68;
1762
1763 rbuf[1] = 0x83; /* this page code */
1764 num = 4;
1765
1766 if (buflen > (ATA_ID_SERNO_LEN + num + 3)) {
1767 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
1768 rbuf[num + 0] = 2;
1769 rbuf[num + 3] = ATA_ID_SERNO_LEN;
1770 num += 4;
1771 ata_id_string(args->id, (unsigned char *) rbuf + num,
1772 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1773 num += ATA_ID_SERNO_LEN;
1774 }
1775 if (buflen > (sat_model_serial_desc_len + num + 3)) {
1776 /* SAT defined lu model and serial numbers descriptor */
1777 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
1778 rbuf[num + 0] = 2;
1779 rbuf[num + 1] = 1;
1780 rbuf[num + 3] = sat_model_serial_desc_len;
1781 num += 4;
1782 memcpy(rbuf + num, "ATA ", 8);
1783 num += 8;
1784 ata_id_string(args->id, (unsigned char *) rbuf + num,
1785 ATA_ID_PROD, ATA_ID_PROD_LEN);
1786 num += ATA_ID_PROD_LEN;
1787 ata_id_string(args->id, (unsigned char *) rbuf + num,
1788 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1789 num += ATA_ID_SERNO_LEN;
1790 }
1791 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
1792 return 0;
1793 }
1794
1795 /**
1796 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
1797 * @args: device IDENTIFY data / SCSI command of interest.
1798 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1799 * @buflen: Response buffer length.
1800 *
1801 * Yields SAT-specified ATA VPD page.
1802 *
1803 * LOCKING:
1804 * spin_lock_irqsave(host lock)
1805 */
1806
1807 unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf,
1808 unsigned int buflen)
1809 {
1810 u8 pbuf[60];
1811 struct ata_taskfile tf;
1812 unsigned int i;
1813
1814 if (!buflen)
1815 return 0;
1816
1817 memset(&pbuf, 0, sizeof(pbuf));
1818 memset(&tf, 0, sizeof(tf));
1819
1820 pbuf[1] = 0x89; /* our page code */
1821 pbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
1822 pbuf[3] = (0x238 & 0xff);
1823
1824 memcpy(&pbuf[8], "linux ", 8);
1825 memcpy(&pbuf[16], "libata ", 16);
1826 memcpy(&pbuf[32], DRV_VERSION, 4);
1827 ata_id_string(args->id, &pbuf[32], ATA_ID_FW_REV, 4);
1828
1829 /* we don't store the ATA device signature, so we fake it */
1830
1831 tf.command = ATA_DRDY; /* really, this is Status reg */
1832 tf.lbal = 0x1;
1833 tf.nsect = 0x1;
1834
1835 ata_tf_to_fis(&tf, 0, 1, &pbuf[36]); /* TODO: PMP? */
1836 pbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
1837
1838 pbuf[56] = ATA_CMD_ID_ATA;
1839
1840 i = min(buflen, 60U);
1841 memcpy(rbuf, &pbuf[0], i);
1842 buflen -= i;
1843
1844 if (!buflen)
1845 return 0;
1846
1847 memcpy(&rbuf[60], &args->id[0], min(buflen, 512U));
1848 return 0;
1849 }
1850
1851 /**
1852 * ata_scsiop_noop - Command handler that simply returns success.
1853 * @args: device IDENTIFY data / SCSI command of interest.
1854 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1855 * @buflen: Response buffer length.
1856 *
1857 * No operation. Simply returns success to caller, to indicate
1858 * that the caller should successfully complete this SCSI command.
1859 *
1860 * LOCKING:
1861 * spin_lock_irqsave(host lock)
1862 */
1863
1864 unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
1865 unsigned int buflen)
1866 {
1867 VPRINTK("ENTER\n");
1868 return 0;
1869 }
1870
1871 /**
1872 * ata_msense_push - Push data onto MODE SENSE data output buffer
1873 * @ptr_io: (input/output) Location to store more output data
1874 * @last: End of output data buffer
1875 * @buf: Pointer to BLOB being added to output buffer
1876 * @buflen: Length of BLOB
1877 *
1878 * Store MODE SENSE data on an output buffer.
1879 *
1880 * LOCKING:
1881 * None.
1882 */
1883
1884 static void ata_msense_push(u8 **ptr_io, const u8 *last,
1885 const u8 *buf, unsigned int buflen)
1886 {
1887 u8 *ptr = *ptr_io;
1888
1889 if ((ptr + buflen - 1) > last)
1890 return;
1891
1892 memcpy(ptr, buf, buflen);
1893
1894 ptr += buflen;
1895
1896 *ptr_io = ptr;
1897 }
1898
1899 /**
1900 * ata_msense_caching - Simulate MODE SENSE caching info page
1901 * @id: device IDENTIFY data
1902 * @ptr_io: (input/output) Location to store more output data
1903 * @last: End of output data buffer
1904 *
1905 * Generate a caching info page, which conditionally indicates
1906 * write caching to the SCSI layer, depending on device
1907 * capabilities.
1908 *
1909 * LOCKING:
1910 * None.
1911 */
1912
1913 static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io,
1914 const u8 *last)
1915 {
1916 u8 page[CACHE_MPAGE_LEN];
1917
1918 memcpy(page, def_cache_mpage, sizeof(page));
1919 if (ata_id_wcache_enabled(id))
1920 page[2] |= (1 << 2); /* write cache enable */
1921 if (!ata_id_rahead_enabled(id))
1922 page[12] |= (1 << 5); /* disable read ahead */
1923
1924 ata_msense_push(ptr_io, last, page, sizeof(page));
1925 return sizeof(page);
1926 }
1927
1928 /**
1929 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
1930 * @dev: Device associated with this MODE SENSE command
1931 * @ptr_io: (input/output) Location to store more output data
1932 * @last: End of output data buffer
1933 *
1934 * Generate a generic MODE SENSE control mode page.
1935 *
1936 * LOCKING:
1937 * None.
1938 */
1939
1940 static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last)
1941 {
1942 ata_msense_push(ptr_io, last, def_control_mpage,
1943 sizeof(def_control_mpage));
1944 return sizeof(def_control_mpage);
1945 }
1946
1947 /**
1948 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
1949 * @dev: Device associated with this MODE SENSE command
1950 * @ptr_io: (input/output) Location to store more output data
1951 * @last: End of output data buffer
1952 *
1953 * Generate a generic MODE SENSE r/w error recovery page.
1954 *
1955 * LOCKING:
1956 * None.
1957 */
1958
1959 static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
1960 {
1961
1962 ata_msense_push(ptr_io, last, def_rw_recovery_mpage,
1963 sizeof(def_rw_recovery_mpage));
1964 return sizeof(def_rw_recovery_mpage);
1965 }
1966
1967 /*
1968 * We can turn this into a real blacklist if it's needed, for now just
1969 * blacklist any Maxtor BANC1G10 revision firmware
1970 */
1971 static int ata_dev_supports_fua(u16 *id)
1972 {
1973 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
1974
1975 if (!libata_fua)
1976 return 0;
1977 if (!ata_id_has_fua(id))
1978 return 0;
1979
1980 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
1981 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
1982
1983 if (strcmp(model, "Maxtor"))
1984 return 1;
1985 if (strcmp(fw, "BANC1G10"))
1986 return 1;
1987
1988 return 0; /* blacklisted */
1989 }
1990
1991 /**
1992 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
1993 * @args: device IDENTIFY data / SCSI command of interest.
1994 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1995 * @buflen: Response buffer length.
1996 *
1997 * Simulate MODE SENSE commands. Assume this is invoked for direct
1998 * access devices (e.g. disks) only. There should be no block
1999 * descriptor for other device types.
2000 *
2001 * LOCKING:
2002 * spin_lock_irqsave(host lock)
2003 */
2004
2005 unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
2006 unsigned int buflen)
2007 {
2008 struct ata_device *dev = args->dev;
2009 u8 *scsicmd = args->cmd->cmnd, *p, *last;
2010 const u8 sat_blk_desc[] = {
2011 0, 0, 0, 0, /* number of blocks: sat unspecified */
2012 0,
2013 0, 0x2, 0x0 /* block length: 512 bytes */
2014 };
2015 u8 pg, spg;
2016 unsigned int ebd, page_control, six_byte, output_len, alloc_len, minlen;
2017 u8 dpofua;
2018
2019 VPRINTK("ENTER\n");
2020
2021 six_byte = (scsicmd[0] == MODE_SENSE);
2022 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2023 /*
2024 * LLBA bit in msense(10) ignored (compliant)
2025 */
2026
2027 page_control = scsicmd[2] >> 6;
2028 switch (page_control) {
2029 case 0: /* current */
2030 break; /* supported */
2031 case 3: /* saved */
2032 goto saving_not_supp;
2033 case 1: /* changeable */
2034 case 2: /* defaults */
2035 default:
2036 goto invalid_fld;
2037 }
2038
2039 if (six_byte) {
2040 output_len = 4 + (ebd ? 8 : 0);
2041 alloc_len = scsicmd[4];
2042 } else {
2043 output_len = 8 + (ebd ? 8 : 0);
2044 alloc_len = (scsicmd[7] << 8) + scsicmd[8];
2045 }
2046 minlen = (alloc_len < buflen) ? alloc_len : buflen;
2047
2048 p = rbuf + output_len;
2049 last = rbuf + minlen - 1;
2050
2051 pg = scsicmd[2] & 0x3f;
2052 spg = scsicmd[3];
2053 /*
2054 * No mode subpages supported (yet) but asking for _all_
2055 * subpages may be valid
2056 */
2057 if (spg && (spg != ALL_SUB_MPAGES))
2058 goto invalid_fld;
2059
2060 switch(pg) {
2061 case RW_RECOVERY_MPAGE:
2062 output_len += ata_msense_rw_recovery(&p, last);
2063 break;
2064
2065 case CACHE_MPAGE:
2066 output_len += ata_msense_caching(args->id, &p, last);
2067 break;
2068
2069 case CONTROL_MPAGE: {
2070 output_len += ata_msense_ctl_mode(&p, last);
2071 break;
2072 }
2073
2074 case ALL_MPAGES:
2075 output_len += ata_msense_rw_recovery(&p, last);
2076 output_len += ata_msense_caching(args->id, &p, last);
2077 output_len += ata_msense_ctl_mode(&p, last);
2078 break;
2079
2080 default: /* invalid page code */
2081 goto invalid_fld;
2082 }
2083
2084 if (minlen < 1)
2085 return 0;
2086
2087 dpofua = 0;
2088 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2089 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2090 dpofua = 1 << 4;
2091
2092 if (six_byte) {
2093 output_len--;
2094 rbuf[0] = output_len;
2095 if (minlen > 2)
2096 rbuf[2] |= dpofua;
2097 if (ebd) {
2098 if (minlen > 3)
2099 rbuf[3] = sizeof(sat_blk_desc);
2100 if (minlen > 11)
2101 memcpy(rbuf + 4, sat_blk_desc,
2102 sizeof(sat_blk_desc));
2103 }
2104 } else {
2105 output_len -= 2;
2106 rbuf[0] = output_len >> 8;
2107 if (minlen > 1)
2108 rbuf[1] = output_len;
2109 if (minlen > 3)
2110 rbuf[3] |= dpofua;
2111 if (ebd) {
2112 if (minlen > 7)
2113 rbuf[7] = sizeof(sat_blk_desc);
2114 if (minlen > 15)
2115 memcpy(rbuf + 8, sat_blk_desc,
2116 sizeof(sat_blk_desc));
2117 }
2118 }
2119 return 0;
2120
2121 invalid_fld:
2122 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2123 /* "Invalid field in cbd" */
2124 return 1;
2125
2126 saving_not_supp:
2127 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2128 /* "Saving parameters not supported" */
2129 return 1;
2130 }
2131
2132 /**
2133 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2134 * @args: device IDENTIFY data / SCSI command of interest.
2135 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2136 * @buflen: Response buffer length.
2137 *
2138 * Simulate READ CAPACITY commands.
2139 *
2140 * LOCKING:
2141 * None.
2142 */
2143 unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
2144 unsigned int buflen)
2145 {
2146 u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */
2147
2148 VPRINTK("ENTER\n");
2149
2150 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2151 if (last_lba >= 0xffffffffULL)
2152 last_lba = 0xffffffff;
2153
2154 /* sector count, 32-bit */
2155 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 3));
2156 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 2));
2157 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 1));
2158 ATA_SCSI_RBUF_SET(3, last_lba);
2159
2160 /* sector size */
2161 ATA_SCSI_RBUF_SET(6, ATA_SECT_SIZE >> 8);
2162 ATA_SCSI_RBUF_SET(7, ATA_SECT_SIZE);
2163 } else {
2164 /* sector count, 64-bit */
2165 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 7));
2166 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 6));
2167 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 5));
2168 ATA_SCSI_RBUF_SET(3, last_lba >> (8 * 4));
2169 ATA_SCSI_RBUF_SET(4, last_lba >> (8 * 3));
2170 ATA_SCSI_RBUF_SET(5, last_lba >> (8 * 2));
2171 ATA_SCSI_RBUF_SET(6, last_lba >> (8 * 1));
2172 ATA_SCSI_RBUF_SET(7, last_lba);
2173
2174 /* sector size */
2175 ATA_SCSI_RBUF_SET(10, ATA_SECT_SIZE >> 8);
2176 ATA_SCSI_RBUF_SET(11, ATA_SECT_SIZE);
2177 }
2178
2179 return 0;
2180 }
2181
2182 /**
2183 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2184 * @args: device IDENTIFY data / SCSI command of interest.
2185 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2186 * @buflen: Response buffer length.
2187 *
2188 * Simulate REPORT LUNS command.
2189 *
2190 * LOCKING:
2191 * spin_lock_irqsave(host lock)
2192 */
2193
2194 unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
2195 unsigned int buflen)
2196 {
2197 VPRINTK("ENTER\n");
2198 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2199
2200 return 0;
2201 }
2202
2203 /**
2204 * ata_scsi_set_sense - Set SCSI sense data and status
2205 * @cmd: SCSI request to be handled
2206 * @sk: SCSI-defined sense key
2207 * @asc: SCSI-defined additional sense code
2208 * @ascq: SCSI-defined additional sense code qualifier
2209 *
2210 * Helper function that builds a valid fixed format, current
2211 * response code and the given sense key (sk), additional sense
2212 * code (asc) and additional sense code qualifier (ascq) with
2213 * a SCSI command status of %SAM_STAT_CHECK_CONDITION and
2214 * DRIVER_SENSE set in the upper bits of scsi_cmnd::result .
2215 *
2216 * LOCKING:
2217 * Not required
2218 */
2219
2220 void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
2221 {
2222 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
2223
2224 cmd->sense_buffer[0] = 0x70; /* fixed format, current */
2225 cmd->sense_buffer[2] = sk;
2226 cmd->sense_buffer[7] = 18 - 8; /* additional sense length */
2227 cmd->sense_buffer[12] = asc;
2228 cmd->sense_buffer[13] = ascq;
2229 }
2230
2231 /**
2232 * ata_scsi_badcmd - End a SCSI request with an error
2233 * @cmd: SCSI request to be handled
2234 * @done: SCSI command completion function
2235 * @asc: SCSI-defined additional sense code
2236 * @ascq: SCSI-defined additional sense code qualifier
2237 *
2238 * Helper function that completes a SCSI command with
2239 * %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST
2240 * and the specified additional sense codes.
2241 *
2242 * LOCKING:
2243 * spin_lock_irqsave(host lock)
2244 */
2245
2246 void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq)
2247 {
2248 DPRINTK("ENTER\n");
2249 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq);
2250
2251 done(cmd);
2252 }
2253
2254 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2255 {
2256 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2257 /* FIXME: not quite right; we don't want the
2258 * translation of taskfile registers into
2259 * a sense descriptors, since that's only
2260 * correct for ATA, not ATAPI
2261 */
2262 ata_gen_passthru_sense(qc);
2263 }
2264
2265 qc->scsidone(qc->scsicmd);
2266 ata_qc_free(qc);
2267 }
2268
2269 /* is it pointless to prefer PIO for "safety reasons"? */
2270 static inline int ata_pio_use_silly(struct ata_port *ap)
2271 {
2272 return (ap->flags & ATA_FLAG_PIO_DMA);
2273 }
2274
2275 static void atapi_request_sense(struct ata_queued_cmd *qc)
2276 {
2277 struct ata_port *ap = qc->ap;
2278 struct scsi_cmnd *cmd = qc->scsicmd;
2279
2280 DPRINTK("ATAPI request sense\n");
2281
2282 /* FIXME: is this needed? */
2283 memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
2284
2285 ap->ops->tf_read(ap, &qc->tf);
2286
2287 /* fill these in, for the case where they are -not- overwritten */
2288 cmd->sense_buffer[0] = 0x70;
2289 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2290
2291 ata_qc_reinit(qc);
2292
2293 ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer));
2294 qc->dma_dir = DMA_FROM_DEVICE;
2295
2296 memset(&qc->cdb, 0, qc->dev->cdb_len);
2297 qc->cdb[0] = REQUEST_SENSE;
2298 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2299
2300 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2301 qc->tf.command = ATA_CMD_PACKET;
2302
2303 if (ata_pio_use_silly(ap)) {
2304 qc->tf.protocol = ATA_PROT_ATAPI_DMA;
2305 qc->tf.feature |= ATAPI_PKT_DMA;
2306 } else {
2307 qc->tf.protocol = ATA_PROT_ATAPI;
2308 qc->tf.lbam = (8 * 1024) & 0xff;
2309 qc->tf.lbah = (8 * 1024) >> 8;
2310 }
2311 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2312
2313 qc->complete_fn = atapi_sense_complete;
2314
2315 ata_qc_issue(qc);
2316
2317 DPRINTK("EXIT\n");
2318 }
2319
2320 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2321 {
2322 struct scsi_cmnd *cmd = qc->scsicmd;
2323 unsigned int err_mask = qc->err_mask;
2324
2325 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2326
2327 /* handle completion from new EH */
2328 if (unlikely(qc->ap->ops->error_handler &&
2329 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2330
2331 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2332 /* FIXME: not quite right; we don't want the
2333 * translation of taskfile registers into a
2334 * sense descriptors, since that's only
2335 * correct for ATA, not ATAPI
2336 */
2337 ata_gen_passthru_sense(qc);
2338 }
2339
2340 /* SCSI EH automatically locks door if sdev->locked is
2341 * set. Sometimes door lock request continues to
2342 * fail, for example, when no media is present. This
2343 * creates a loop - SCSI EH issues door lock which
2344 * fails and gets invoked again to acquire sense data
2345 * for the failed command.
2346 *
2347 * If door lock fails, always clear sdev->locked to
2348 * avoid this infinite loop.
2349 */
2350 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
2351 qc->dev->sdev->locked = 0;
2352
2353 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2354 qc->scsidone(cmd);
2355 ata_qc_free(qc);
2356 return;
2357 }
2358
2359 /* successful completion or old EH failure path */
2360 if (unlikely(err_mask & AC_ERR_DEV)) {
2361 cmd->result = SAM_STAT_CHECK_CONDITION;
2362 atapi_request_sense(qc);
2363 return;
2364 } else if (unlikely(err_mask)) {
2365 /* FIXME: not quite right; we don't want the
2366 * translation of taskfile registers into
2367 * a sense descriptors, since that's only
2368 * correct for ATA, not ATAPI
2369 */
2370 ata_gen_passthru_sense(qc);
2371 } else {
2372 u8 *scsicmd = cmd->cmnd;
2373
2374 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2375 u8 *buf = NULL;
2376 unsigned int buflen;
2377
2378 buflen = ata_scsi_rbuf_get(cmd, &buf);
2379
2380 /* ATAPI devices typically report zero for their SCSI version,
2381 * and sometimes deviate from the spec WRT response data
2382 * format. If SCSI version is reported as zero like normal,
2383 * then we make the following fixups: 1) Fake MMC-5 version,
2384 * to indicate to the Linux scsi midlayer this is a modern
2385 * device. 2) Ensure response data format / ATAPI information
2386 * are always correct.
2387 */
2388 if (buf[2] == 0) {
2389 buf[2] = 0x5;
2390 buf[3] = 0x32;
2391 }
2392
2393 ata_scsi_rbuf_put(cmd, buf);
2394 }
2395
2396 cmd->result = SAM_STAT_GOOD;
2397 }
2398
2399 qc->scsidone(cmd);
2400 ata_qc_free(qc);
2401 }
2402 /**
2403 * atapi_xlat - Initialize PACKET taskfile
2404 * @qc: command structure to be initialized
2405 *
2406 * LOCKING:
2407 * spin_lock_irqsave(host lock)
2408 *
2409 * RETURNS:
2410 * Zero on success, non-zero on failure.
2411 */
2412 static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2413 {
2414 struct scsi_cmnd *scmd = qc->scsicmd;
2415 struct ata_device *dev = qc->dev;
2416 int using_pio = (dev->flags & ATA_DFLAG_PIO);
2417 int nodata = (scmd->sc_data_direction == DMA_NONE);
2418
2419 memset(qc->cdb, 0, dev->cdb_len);
2420 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2421
2422 qc->complete_fn = atapi_qc_complete;
2423
2424 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2425 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2426 qc->tf.flags |= ATA_TFLAG_WRITE;
2427 DPRINTK("direction: write\n");
2428 }
2429
2430 qc->tf.command = ATA_CMD_PACKET;
2431 qc->nbytes = scsi_bufflen(scmd);
2432
2433 /* check whether ATAPI DMA is safe */
2434 if (!using_pio && ata_check_atapi_dma(qc))
2435 using_pio = 1;
2436
2437 if (using_pio || nodata) {
2438 /* no data, or PIO data xfer */
2439 if (nodata)
2440 qc->tf.protocol = ATA_PROT_ATAPI_NODATA;
2441 else
2442 qc->tf.protocol = ATA_PROT_ATAPI;
2443 qc->tf.lbam = (8 * 1024) & 0xff;
2444 qc->tf.lbah = (8 * 1024) >> 8;
2445 } else {
2446 /* DMA data xfer */
2447 qc->tf.protocol = ATA_PROT_ATAPI_DMA;
2448 qc->tf.feature |= ATAPI_PKT_DMA;
2449
2450 if (atapi_dmadir && (scmd->sc_data_direction != DMA_TO_DEVICE))
2451 /* some SATA bridges need us to indicate data xfer direction */
2452 qc->tf.feature |= ATAPI_DMADIR;
2453 }
2454
2455 return 0;
2456 }
2457
2458 static struct ata_device * ata_find_dev(struct ata_port *ap, int devno)
2459 {
2460 if (ap->nr_pmp_links == 0) {
2461 if (likely(devno < ata_link_max_devices(&ap->link)))
2462 return &ap->link.device[devno];
2463 } else {
2464 if (likely(devno < ap->nr_pmp_links))
2465 return &ap->pmp_link[devno].device[0];
2466 }
2467
2468 return NULL;
2469 }
2470
2471 static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
2472 const struct scsi_device *scsidev)
2473 {
2474 int devno;
2475
2476 /* skip commands not addressed to targets we simulate */
2477 if (ap->nr_pmp_links == 0) {
2478 if (unlikely(scsidev->channel || scsidev->lun))
2479 return NULL;
2480 devno = scsidev->id;
2481 } else {
2482 if (unlikely(scsidev->id || scsidev->lun))
2483 return NULL;
2484 devno = scsidev->channel;
2485 }
2486
2487 return ata_find_dev(ap, devno);
2488 }
2489
2490 /**
2491 * ata_scsi_dev_enabled - determine if device is enabled
2492 * @dev: ATA device
2493 *
2494 * Determine if commands should be sent to the specified device.
2495 *
2496 * LOCKING:
2497 * spin_lock_irqsave(host lock)
2498 *
2499 * RETURNS:
2500 * 0 if commands are not allowed / 1 if commands are allowed
2501 */
2502
2503 static int ata_scsi_dev_enabled(struct ata_device *dev)
2504 {
2505 if (unlikely(!ata_dev_enabled(dev)))
2506 return 0;
2507
2508 if (!atapi_enabled || (dev->link->ap->flags & ATA_FLAG_NO_ATAPI)) {
2509 if (unlikely(dev->class == ATA_DEV_ATAPI)) {
2510 ata_dev_printk(dev, KERN_WARNING,
2511 "WARNING: ATAPI is %s, device ignored.\n",
2512 atapi_enabled ? "not supported with this driver" : "disabled");
2513 return 0;
2514 }
2515 }
2516
2517 return 1;
2518 }
2519
2520 /**
2521 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2522 * @ap: ATA port to which the device is attached
2523 * @scsidev: SCSI device from which we derive the ATA device
2524 *
2525 * Given various information provided in struct scsi_cmnd,
2526 * map that onto an ATA bus, and using that mapping
2527 * determine which ata_device is associated with the
2528 * SCSI command to be sent.
2529 *
2530 * LOCKING:
2531 * spin_lock_irqsave(host lock)
2532 *
2533 * RETURNS:
2534 * Associated ATA device, or %NULL if not found.
2535 */
2536 static struct ata_device *
2537 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2538 {
2539 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2540
2541 if (unlikely(!dev || !ata_scsi_dev_enabled(dev)))
2542 return NULL;
2543
2544 return dev;
2545 }
2546
2547 /*
2548 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2549 * @byte1: Byte 1 from pass-thru CDB.
2550 *
2551 * RETURNS:
2552 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2553 */
2554 static u8
2555 ata_scsi_map_proto(u8 byte1)
2556 {
2557 switch((byte1 & 0x1e) >> 1) {
2558 case 3: /* Non-data */
2559 return ATA_PROT_NODATA;
2560
2561 case 6: /* DMA */
2562 case 10: /* UDMA Data-in */
2563 case 11: /* UDMA Data-Out */
2564 return ATA_PROT_DMA;
2565
2566 case 4: /* PIO Data-in */
2567 case 5: /* PIO Data-out */
2568 return ATA_PROT_PIO;
2569
2570 case 0: /* Hard Reset */
2571 case 1: /* SRST */
2572 case 8: /* Device Diagnostic */
2573 case 9: /* Device Reset */
2574 case 7: /* DMA Queued */
2575 case 12: /* FPDMA */
2576 case 15: /* Return Response Info */
2577 default: /* Reserved */
2578 break;
2579 }
2580
2581 return ATA_PROT_UNKNOWN;
2582 }
2583
2584 /**
2585 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2586 * @qc: command structure to be initialized
2587 *
2588 * Handles either 12 or 16-byte versions of the CDB.
2589 *
2590 * RETURNS:
2591 * Zero on success, non-zero on failure.
2592 */
2593 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2594 {
2595 struct ata_taskfile *tf = &(qc->tf);
2596 struct scsi_cmnd *scmd = qc->scsicmd;
2597 struct ata_device *dev = qc->dev;
2598 const u8 *cdb = scmd->cmnd;
2599
2600 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2601 goto invalid_fld;
2602
2603 /* We may not issue DMA commands if no DMA mode is set */
2604 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2605 goto invalid_fld;
2606
2607 /*
2608 * 12 and 16 byte CDBs use different offsets to
2609 * provide the various register values.
2610 */
2611 if (cdb[0] == ATA_16) {
2612 /*
2613 * 16-byte CDB - may contain extended commands.
2614 *
2615 * If that is the case, copy the upper byte register values.
2616 */
2617 if (cdb[1] & 0x01) {
2618 tf->hob_feature = cdb[3];
2619 tf->hob_nsect = cdb[5];
2620 tf->hob_lbal = cdb[7];
2621 tf->hob_lbam = cdb[9];
2622 tf->hob_lbah = cdb[11];
2623 tf->flags |= ATA_TFLAG_LBA48;
2624 } else
2625 tf->flags &= ~ATA_TFLAG_LBA48;
2626
2627 /*
2628 * Always copy low byte, device and command registers.
2629 */
2630 tf->feature = cdb[4];
2631 tf->nsect = cdb[6];
2632 tf->lbal = cdb[8];
2633 tf->lbam = cdb[10];
2634 tf->lbah = cdb[12];
2635 tf->device = cdb[13];
2636 tf->command = cdb[14];
2637 } else {
2638 /*
2639 * 12-byte CDB - incapable of extended commands.
2640 */
2641 tf->flags &= ~ATA_TFLAG_LBA48;
2642
2643 tf->feature = cdb[3];
2644 tf->nsect = cdb[4];
2645 tf->lbal = cdb[5];
2646 tf->lbam = cdb[6];
2647 tf->lbah = cdb[7];
2648 tf->device = cdb[8];
2649 tf->command = cdb[9];
2650 }
2651
2652 /* enforce correct master/slave bit */
2653 tf->device = dev->devno ?
2654 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2655
2656 /* sanity check for pio multi commands */
2657 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
2658 goto invalid_fld;
2659
2660 if (is_multi_taskfile(tf)) {
2661 unsigned int multi_count = 1 << (cdb[1] >> 5);
2662
2663 /* compare the passed through multi_count
2664 * with the cached multi_count of libata
2665 */
2666 if (multi_count != dev->multi_count)
2667 ata_dev_printk(dev, KERN_WARNING,
2668 "invalid multi_count %u ignored\n",
2669 multi_count);
2670 }
2671
2672 /* READ/WRITE LONG use a non-standard sect_size */
2673 qc->sect_size = ATA_SECT_SIZE;
2674 switch (tf->command) {
2675 case ATA_CMD_READ_LONG:
2676 case ATA_CMD_READ_LONG_ONCE:
2677 case ATA_CMD_WRITE_LONG:
2678 case ATA_CMD_WRITE_LONG_ONCE:
2679 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2680 goto invalid_fld;
2681 qc->sect_size = scsi_bufflen(scmd);
2682 }
2683
2684 /*
2685 * Filter SET_FEATURES - XFER MODE command -- otherwise,
2686 * SET_FEATURES - XFER MODE must be preceded/succeeded
2687 * by an update to hardware-specific registers for each
2688 * controller (i.e. the reason for ->set_piomode(),
2689 * ->set_dmamode(), and ->post_set_mode() hooks).
2690 */
2691 if ((tf->command == ATA_CMD_SET_FEATURES)
2692 && (tf->feature == SETFEATURES_XFER))
2693 goto invalid_fld;
2694
2695 /*
2696 * Set flags so that all registers will be written,
2697 * and pass on write indication (used for PIO/DMA
2698 * setup.)
2699 */
2700 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
2701
2702 if (scmd->sc_data_direction == DMA_TO_DEVICE)
2703 tf->flags |= ATA_TFLAG_WRITE;
2704
2705 /*
2706 * Set transfer length.
2707 *
2708 * TODO: find out if we need to do more here to
2709 * cover scatter/gather case.
2710 */
2711 qc->nbytes = scsi_bufflen(scmd);
2712
2713 /* request result TF */
2714 qc->flags |= ATA_QCFLAG_RESULT_TF;
2715
2716 return 0;
2717
2718 invalid_fld:
2719 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
2720 /* "Invalid field in cdb" */
2721 return 1;
2722 }
2723
2724 /**
2725 * ata_get_xlat_func - check if SCSI to ATA translation is possible
2726 * @dev: ATA device
2727 * @cmd: SCSI command opcode to consider
2728 *
2729 * Look up the SCSI command given, and determine whether the
2730 * SCSI command is to be translated or simulated.
2731 *
2732 * RETURNS:
2733 * Pointer to translation function if possible, %NULL if not.
2734 */
2735
2736 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
2737 {
2738 switch (cmd) {
2739 case READ_6:
2740 case READ_10:
2741 case READ_16:
2742
2743 case WRITE_6:
2744 case WRITE_10:
2745 case WRITE_16:
2746 return ata_scsi_rw_xlat;
2747
2748 case SYNCHRONIZE_CACHE:
2749 if (ata_try_flush_cache(dev))
2750 return ata_scsi_flush_xlat;
2751 break;
2752
2753 case VERIFY:
2754 case VERIFY_16:
2755 return ata_scsi_verify_xlat;
2756
2757 case ATA_12:
2758 case ATA_16:
2759 return ata_scsi_pass_thru;
2760
2761 case START_STOP:
2762 return ata_scsi_start_stop_xlat;
2763 }
2764
2765 return NULL;
2766 }
2767
2768 /**
2769 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
2770 * @ap: ATA port to which the command was being sent
2771 * @cmd: SCSI command to dump
2772 *
2773 * Prints the contents of a SCSI command via printk().
2774 */
2775
2776 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
2777 struct scsi_cmnd *cmd)
2778 {
2779 #ifdef ATA_DEBUG
2780 struct scsi_device *scsidev = cmd->device;
2781 u8 *scsicmd = cmd->cmnd;
2782
2783 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
2784 ap->print_id,
2785 scsidev->channel, scsidev->id, scsidev->lun,
2786 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
2787 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
2788 scsicmd[8]);
2789 #endif
2790 }
2791
2792 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2793 void (*done)(struct scsi_cmnd *),
2794 struct ata_device *dev)
2795 {
2796 u8 scsi_op = scmd->cmnd[0];
2797 ata_xlat_func_t xlat_func;
2798 int rc = 0;
2799
2800 if (dev->class == ATA_DEV_ATA) {
2801 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
2802 goto bad_cdb_len;
2803
2804 xlat_func = ata_get_xlat_func(dev, scsi_op);
2805 } else {
2806 if (unlikely(!scmd->cmd_len))
2807 goto bad_cdb_len;
2808
2809 xlat_func = NULL;
2810 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
2811 /* relay SCSI command to ATAPI device */
2812 if (unlikely(scmd->cmd_len > dev->cdb_len))
2813 goto bad_cdb_len;
2814
2815 xlat_func = atapi_xlat;
2816 } else {
2817 /* ATA_16 passthru, treat as an ATA command */
2818 if (unlikely(scmd->cmd_len > 16))
2819 goto bad_cdb_len;
2820
2821 xlat_func = ata_get_xlat_func(dev, scsi_op);
2822 }
2823 }
2824
2825 if (xlat_func)
2826 rc = ata_scsi_translate(dev, scmd, done, xlat_func);
2827 else
2828 ata_scsi_simulate(dev, scmd, done);
2829
2830 return rc;
2831
2832 bad_cdb_len:
2833 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
2834 scmd->cmd_len, scsi_op, dev->cdb_len);
2835 scmd->result = DID_ERROR << 16;
2836 done(scmd);
2837 return 0;
2838 }
2839
2840 /**
2841 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
2842 * @cmd: SCSI command to be sent
2843 * @done: Completion function, called when command is complete
2844 *
2845 * In some cases, this function translates SCSI commands into
2846 * ATA taskfiles, and queues the taskfiles to be sent to
2847 * hardware. In other cases, this function simulates a
2848 * SCSI device by evaluating and responding to certain
2849 * SCSI commands. This creates the overall effect of
2850 * ATA and ATAPI devices appearing as SCSI devices.
2851 *
2852 * LOCKING:
2853 * Releases scsi-layer-held lock, and obtains host lock.
2854 *
2855 * RETURNS:
2856 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
2857 * 0 otherwise.
2858 */
2859 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
2860 {
2861 struct ata_port *ap;
2862 struct ata_device *dev;
2863 struct scsi_device *scsidev = cmd->device;
2864 struct Scsi_Host *shost = scsidev->host;
2865 int rc = 0;
2866
2867 ap = ata_shost_to_port(shost);
2868
2869 spin_unlock(shost->host_lock);
2870 spin_lock(ap->lock);
2871
2872 ata_scsi_dump_cdb(ap, cmd);
2873
2874 dev = ata_scsi_find_dev(ap, scsidev);
2875 if (likely(dev))
2876 rc = __ata_scsi_queuecmd(cmd, done, dev);
2877 else {
2878 cmd->result = (DID_BAD_TARGET << 16);
2879 done(cmd);
2880 }
2881
2882 spin_unlock(ap->lock);
2883 spin_lock(shost->host_lock);
2884 return rc;
2885 }
2886
2887 /**
2888 * ata_scsi_simulate - simulate SCSI command on ATA device
2889 * @dev: the target device
2890 * @cmd: SCSI command being sent to device.
2891 * @done: SCSI command completion function.
2892 *
2893 * Interprets and directly executes a select list of SCSI commands
2894 * that can be handled internally.
2895 *
2896 * LOCKING:
2897 * spin_lock_irqsave(host lock)
2898 */
2899
2900 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
2901 void (*done)(struct scsi_cmnd *))
2902 {
2903 struct ata_scsi_args args;
2904 const u8 *scsicmd = cmd->cmnd;
2905 u8 tmp8;
2906
2907 args.dev = dev;
2908 args.id = dev->id;
2909 args.cmd = cmd;
2910 args.done = done;
2911
2912 switch(scsicmd[0]) {
2913 /* TODO: worth improving? */
2914 case FORMAT_UNIT:
2915 ata_scsi_invalid_field(cmd, done);
2916 break;
2917
2918 case INQUIRY:
2919 if (scsicmd[1] & 2) /* is CmdDt set? */
2920 ata_scsi_invalid_field(cmd, done);
2921 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
2922 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
2923 else switch (scsicmd[2]) {
2924 case 0x00:
2925 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
2926 break;
2927 case 0x80:
2928 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
2929 break;
2930 case 0x83:
2931 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
2932 break;
2933 case 0x89:
2934 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
2935 break;
2936 default:
2937 ata_scsi_invalid_field(cmd, done);
2938 break;
2939 }
2940 break;
2941
2942 case MODE_SENSE:
2943 case MODE_SENSE_10:
2944 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
2945 break;
2946
2947 case MODE_SELECT: /* unconditionally return */
2948 case MODE_SELECT_10: /* bad-field-in-cdb */
2949 ata_scsi_invalid_field(cmd, done);
2950 break;
2951
2952 case READ_CAPACITY:
2953 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2954 break;
2955
2956 case SERVICE_ACTION_IN:
2957 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
2958 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2959 else
2960 ata_scsi_invalid_field(cmd, done);
2961 break;
2962
2963 case REPORT_LUNS:
2964 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
2965 break;
2966
2967 case REQUEST_SENSE:
2968 ata_scsi_set_sense(cmd, 0, 0, 0);
2969 cmd->result = (DRIVER_SENSE << 24);
2970 done(cmd);
2971 break;
2972
2973 /* if we reach this, then writeback caching is disabled,
2974 * turning this into a no-op.
2975 */
2976 case SYNCHRONIZE_CACHE:
2977 /* fall through */
2978
2979 /* no-op's, complete with success */
2980 case REZERO_UNIT:
2981 case SEEK_6:
2982 case SEEK_10:
2983 case TEST_UNIT_READY:
2984 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
2985 break;
2986
2987 case SEND_DIAGNOSTIC:
2988 tmp8 = scsicmd[1] & ~(1 << 3);
2989 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
2990 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
2991 else
2992 ata_scsi_invalid_field(cmd, done);
2993 break;
2994
2995 /* all other commands */
2996 default:
2997 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
2998 /* "Invalid command operation code" */
2999 done(cmd);
3000 break;
3001 }
3002 }
3003
3004 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3005 {
3006 int i, rc;
3007
3008 for (i = 0; i < host->n_ports; i++) {
3009 struct ata_port *ap = host->ports[i];
3010 struct Scsi_Host *shost;
3011
3012 rc = -ENOMEM;
3013 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3014 if (!shost)
3015 goto err_alloc;
3016
3017 *(struct ata_port **)&shost->hostdata[0] = ap;
3018 ap->scsi_host = shost;
3019
3020 shost->transportt = &ata_scsi_transport_template;
3021 shost->unique_id = ap->print_id;
3022 shost->max_id = 16;
3023 shost->max_lun = 1;
3024 shost->max_channel = 1;
3025 shost->max_cmd_len = 16;
3026
3027 /* Schedule policy is determined by ->qc_defer()
3028 * callback and it needs to see every deferred qc.
3029 * Set host_blocked to 1 to prevent SCSI midlayer from
3030 * automatically deferring requests.
3031 */
3032 shost->max_host_blocked = 1;
3033
3034 rc = scsi_add_host(ap->scsi_host, ap->host->dev);
3035 if (rc)
3036 goto err_add;
3037 }
3038
3039 return 0;
3040
3041 err_add:
3042 scsi_host_put(host->ports[i]->scsi_host);
3043 err_alloc:
3044 while (--i >= 0) {
3045 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3046
3047 scsi_remove_host(shost);
3048 scsi_host_put(shost);
3049 }
3050 return rc;
3051 }
3052
3053 void ata_scsi_scan_host(struct ata_port *ap, int sync)
3054 {
3055 int tries = 5;
3056 struct ata_device *last_failed_dev = NULL;
3057 struct ata_link *link;
3058 struct ata_device *dev;
3059
3060 if (ap->flags & ATA_FLAG_DISABLED)
3061 return;
3062
3063 repeat:
3064 ata_port_for_each_link(link, ap) {
3065 ata_link_for_each_dev(dev, link) {
3066 struct scsi_device *sdev;
3067 int channel = 0, id = 0;
3068
3069 if (!ata_dev_enabled(dev) || dev->sdev)
3070 continue;
3071
3072 if (ata_is_host_link(link))
3073 id = dev->devno;
3074 else
3075 channel = link->pmp;
3076
3077 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3078 NULL);
3079 if (!IS_ERR(sdev)) {
3080 dev->sdev = sdev;
3081 scsi_device_put(sdev);
3082 }
3083 }
3084 }
3085
3086 /* If we scanned while EH was in progress or allocation
3087 * failure occurred, scan would have failed silently. Check
3088 * whether all devices are attached.
3089 */
3090 ata_port_for_each_link(link, ap) {
3091 ata_link_for_each_dev(dev, link) {
3092 if (ata_dev_enabled(dev) && !dev->sdev)
3093 goto exit_loop;
3094 }
3095 }
3096 exit_loop:
3097 if (!link)
3098 return;
3099
3100 /* we're missing some SCSI devices */
3101 if (sync) {
3102 /* If caller requested synchrnous scan && we've made
3103 * any progress, sleep briefly and repeat.
3104 */
3105 if (dev != last_failed_dev) {
3106 msleep(100);
3107 last_failed_dev = dev;
3108 goto repeat;
3109 }
3110
3111 /* We might be failing to detect boot device, give it
3112 * a few more chances.
3113 */
3114 if (--tries) {
3115 msleep(100);
3116 goto repeat;
3117 }
3118
3119 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan "
3120 "failed without making any progress,\n"
3121 " switching to async\n");
3122 }
3123
3124 queue_delayed_work(ata_aux_wq, &ap->hotplug_task,
3125 round_jiffies_relative(HZ));
3126 }
3127
3128 /**
3129 * ata_scsi_offline_dev - offline attached SCSI device
3130 * @dev: ATA device to offline attached SCSI device for
3131 *
3132 * This function is called from ata_eh_hotplug() and responsible
3133 * for taking the SCSI device attached to @dev offline. This
3134 * function is called with host lock which protects dev->sdev
3135 * against clearing.
3136 *
3137 * LOCKING:
3138 * spin_lock_irqsave(host lock)
3139 *
3140 * RETURNS:
3141 * 1 if attached SCSI device exists, 0 otherwise.
3142 */
3143 int ata_scsi_offline_dev(struct ata_device *dev)
3144 {
3145 if (dev->sdev) {
3146 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3147 return 1;
3148 }
3149 return 0;
3150 }
3151
3152 /**
3153 * ata_scsi_remove_dev - remove attached SCSI device
3154 * @dev: ATA device to remove attached SCSI device for
3155 *
3156 * This function is called from ata_eh_scsi_hotplug() and
3157 * responsible for removing the SCSI device attached to @dev.
3158 *
3159 * LOCKING:
3160 * Kernel thread context (may sleep).
3161 */
3162 static void ata_scsi_remove_dev(struct ata_device *dev)
3163 {
3164 struct ata_port *ap = dev->link->ap;
3165 struct scsi_device *sdev;
3166 unsigned long flags;
3167
3168 /* Alas, we need to grab scan_mutex to ensure SCSI device
3169 * state doesn't change underneath us and thus
3170 * scsi_device_get() always succeeds. The mutex locking can
3171 * be removed if there is __scsi_device_get() interface which
3172 * increments reference counts regardless of device state.
3173 */
3174 mutex_lock(&ap->scsi_host->scan_mutex);
3175 spin_lock_irqsave(ap->lock, flags);
3176
3177 /* clearing dev->sdev is protected by host lock */
3178 sdev = dev->sdev;
3179 dev->sdev = NULL;
3180
3181 if (sdev) {
3182 /* If user initiated unplug races with us, sdev can go
3183 * away underneath us after the host lock and
3184 * scan_mutex are released. Hold onto it.
3185 */
3186 if (scsi_device_get(sdev) == 0) {
3187 /* The following ensures the attached sdev is
3188 * offline on return from ata_scsi_offline_dev()
3189 * regardless it wins or loses the race
3190 * against this function.
3191 */
3192 scsi_device_set_state(sdev, SDEV_OFFLINE);
3193 } else {
3194 WARN_ON(1);
3195 sdev = NULL;
3196 }
3197 }
3198
3199 spin_unlock_irqrestore(ap->lock, flags);
3200 mutex_unlock(&ap->scsi_host->scan_mutex);
3201
3202 if (sdev) {
3203 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
3204 sdev->sdev_gendev.bus_id);
3205
3206 scsi_remove_device(sdev);
3207 scsi_device_put(sdev);
3208 }
3209 }
3210
3211 static void ata_scsi_handle_link_detach(struct ata_link *link)
3212 {
3213 struct ata_port *ap = link->ap;
3214 struct ata_device *dev;
3215
3216 ata_link_for_each_dev(dev, link) {
3217 unsigned long flags;
3218
3219 if (!(dev->flags & ATA_DFLAG_DETACHED))
3220 continue;
3221
3222 spin_lock_irqsave(ap->lock, flags);
3223 dev->flags &= ~ATA_DFLAG_DETACHED;
3224 spin_unlock_irqrestore(ap->lock, flags);
3225
3226 ata_scsi_remove_dev(dev);
3227 }
3228 }
3229
3230 /**
3231 * ata_scsi_media_change_notify - send media change event
3232 * @atadev: Pointer to the disk device with media change event
3233 *
3234 * Tell the block layer to send a media change notification
3235 * event.
3236 *
3237 * LOCKING:
3238 * spin_lock_irqsave(host lock)
3239 */
3240 void ata_scsi_media_change_notify(struct ata_device *dev)
3241 {
3242 #ifdef OTHER_AN_PATCHES_HAVE_BEEN_APPLIED
3243 if (dev->sdev)
3244 scsi_device_event_notify(dev->sdev, SDEV_MEDIA_CHANGE);
3245 #endif
3246 }
3247
3248 /**
3249 * ata_scsi_hotplug - SCSI part of hotplug
3250 * @work: Pointer to ATA port to perform SCSI hotplug on
3251 *
3252 * Perform SCSI part of hotplug. It's executed from a separate
3253 * workqueue after EH completes. This is necessary because SCSI
3254 * hot plugging requires working EH and hot unplugging is
3255 * synchronized with hot plugging with a mutex.
3256 *
3257 * LOCKING:
3258 * Kernel thread context (may sleep).
3259 */
3260 void ata_scsi_hotplug(struct work_struct *work)
3261 {
3262 struct ata_port *ap =
3263 container_of(work, struct ata_port, hotplug_task.work);
3264 int i;
3265
3266 if (ap->pflags & ATA_PFLAG_UNLOADING) {
3267 DPRINTK("ENTER/EXIT - unloading\n");
3268 return;
3269 }
3270
3271 DPRINTK("ENTER\n");
3272
3273 /* Unplug detached devices. We cannot use link iterator here
3274 * because PMP links have to be scanned even if PMP is
3275 * currently not attached. Iterate manually.
3276 */
3277 ata_scsi_handle_link_detach(&ap->link);
3278 if (ap->pmp_link)
3279 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3280 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3281
3282 /* scan for new ones */
3283 ata_scsi_scan_host(ap, 0);
3284
3285 DPRINTK("EXIT\n");
3286 }
3287
3288 /**
3289 * ata_scsi_user_scan - indication for user-initiated bus scan
3290 * @shost: SCSI host to scan
3291 * @channel: Channel to scan
3292 * @id: ID to scan
3293 * @lun: LUN to scan
3294 *
3295 * This function is called when user explicitly requests bus
3296 * scan. Set probe pending flag and invoke EH.
3297 *
3298 * LOCKING:
3299 * SCSI layer (we don't care)
3300 *
3301 * RETURNS:
3302 * Zero.
3303 */
3304 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3305 unsigned int id, unsigned int lun)
3306 {
3307 struct ata_port *ap = ata_shost_to_port(shost);
3308 unsigned long flags;
3309 int devno, rc = 0;
3310
3311 if (!ap->ops->error_handler)
3312 return -EOPNOTSUPP;
3313
3314 if (lun != SCAN_WILD_CARD && lun)
3315 return -EINVAL;
3316
3317 if (ap->nr_pmp_links == 0) {
3318 if (channel != SCAN_WILD_CARD && channel)
3319 return -EINVAL;
3320 devno = id;
3321 } else {
3322 if (id != SCAN_WILD_CARD && id)
3323 return -EINVAL;
3324 devno = channel;
3325 }
3326
3327 spin_lock_irqsave(ap->lock, flags);
3328
3329 if (devno == SCAN_WILD_CARD) {
3330 struct ata_link *link;
3331
3332 ata_port_for_each_link(link, ap) {
3333 struct ata_eh_info *ehi = &link->eh_info;
3334 ehi->probe_mask |= (1 << ata_link_max_devices(link)) - 1;
3335 ehi->action |= ATA_EH_SOFTRESET;
3336 }
3337 } else {
3338 struct ata_device *dev = ata_find_dev(ap, devno);
3339
3340 if (dev) {
3341 struct ata_eh_info *ehi = &dev->link->eh_info;
3342 ehi->probe_mask |= 1 << dev->devno;
3343 ehi->action |= ATA_EH_SOFTRESET;
3344 ehi->flags |= ATA_EHI_RESUME_LINK;
3345 } else
3346 rc = -EINVAL;
3347 }
3348
3349 if (rc == 0) {
3350 ata_port_schedule_eh(ap);
3351 spin_unlock_irqrestore(ap->lock, flags);
3352 ata_port_wait_eh(ap);
3353 } else
3354 spin_unlock_irqrestore(ap->lock, flags);
3355
3356 return rc;
3357 }
3358
3359 /**
3360 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3361 * @work: Pointer to ATA port to perform scsi_rescan_device()
3362 *
3363 * After ATA pass thru (SAT) commands are executed successfully,
3364 * libata need to propagate the changes to SCSI layer. This
3365 * function must be executed from ata_aux_wq such that sdev
3366 * attach/detach don't race with rescan.
3367 *
3368 * LOCKING:
3369 * Kernel thread context (may sleep).
3370 */
3371 void ata_scsi_dev_rescan(struct work_struct *work)
3372 {
3373 struct ata_port *ap =
3374 container_of(work, struct ata_port, scsi_rescan_task);
3375 struct ata_link *link;
3376 struct ata_device *dev;
3377 unsigned long flags;
3378
3379 spin_lock_irqsave(ap->lock, flags);
3380
3381 ata_port_for_each_link(link, ap) {
3382 ata_link_for_each_dev(dev, link) {
3383 struct scsi_device *sdev = dev->sdev;
3384
3385 if (!ata_dev_enabled(dev) || !sdev)
3386 continue;
3387 if (scsi_device_get(sdev))
3388 continue;
3389
3390 spin_unlock_irqrestore(ap->lock, flags);
3391 scsi_rescan_device(&(sdev->sdev_gendev));
3392 scsi_device_put(sdev);
3393 spin_lock_irqsave(ap->lock, flags);
3394 }
3395 }
3396
3397 spin_unlock_irqrestore(ap->lock, flags);
3398 }
3399
3400 /**
3401 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3402 * @host: ATA host container for all SAS ports
3403 * @port_info: Information from low-level host driver
3404 * @shost: SCSI host that the scsi device is attached to
3405 *
3406 * LOCKING:
3407 * PCI/etc. bus probe sem.
3408 *
3409 * RETURNS:
3410 * ata_port pointer on success / NULL on failure.
3411 */
3412
3413 struct ata_port *ata_sas_port_alloc(struct ata_host *host,
3414 struct ata_port_info *port_info,
3415 struct Scsi_Host *shost)
3416 {
3417 struct ata_port *ap;
3418
3419 ap = ata_port_alloc(host);
3420 if (!ap)
3421 return NULL;
3422
3423 ap->port_no = 0;
3424 ap->lock = shost->host_lock;
3425 ap->pio_mask = port_info->pio_mask;
3426 ap->mwdma_mask = port_info->mwdma_mask;
3427 ap->udma_mask = port_info->udma_mask;
3428 ap->flags |= port_info->flags;
3429 ap->ops = port_info->port_ops;
3430 ap->cbl = ATA_CBL_SATA;
3431
3432 return ap;
3433 }
3434 EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3435
3436 /**
3437 * ata_sas_port_start - Set port up for dma.
3438 * @ap: Port to initialize
3439 *
3440 * Called just after data structures for each port are
3441 * initialized. Allocates DMA pad.
3442 *
3443 * May be used as the port_start() entry in ata_port_operations.
3444 *
3445 * LOCKING:
3446 * Inherited from caller.
3447 */
3448 int ata_sas_port_start(struct ata_port *ap)
3449 {
3450 return ata_pad_alloc(ap, ap->dev);
3451 }
3452 EXPORT_SYMBOL_GPL(ata_sas_port_start);
3453
3454 /**
3455 * ata_port_stop - Undo ata_sas_port_start()
3456 * @ap: Port to shut down
3457 *
3458 * Frees the DMA pad.
3459 *
3460 * May be used as the port_stop() entry in ata_port_operations.
3461 *
3462 * LOCKING:
3463 * Inherited from caller.
3464 */
3465
3466 void ata_sas_port_stop(struct ata_port *ap)
3467 {
3468 ata_pad_free(ap, ap->dev);
3469 }
3470 EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3471
3472 /**
3473 * ata_sas_port_init - Initialize a SATA device
3474 * @ap: SATA port to initialize
3475 *
3476 * LOCKING:
3477 * PCI/etc. bus probe sem.
3478 *
3479 * RETURNS:
3480 * Zero on success, non-zero on error.
3481 */
3482
3483 int ata_sas_port_init(struct ata_port *ap)
3484 {
3485 int rc = ap->ops->port_start(ap);
3486
3487 if (!rc) {
3488 ap->print_id = ata_print_id++;
3489 rc = ata_bus_probe(ap);
3490 }
3491
3492 return rc;
3493 }
3494 EXPORT_SYMBOL_GPL(ata_sas_port_init);
3495
3496 /**
3497 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3498 * @ap: SATA port to destroy
3499 *
3500 */
3501
3502 void ata_sas_port_destroy(struct ata_port *ap)
3503 {
3504 if (ap->ops->port_stop)
3505 ap->ops->port_stop(ap);
3506 kfree(ap);
3507 }
3508 EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3509
3510 /**
3511 * ata_sas_slave_configure - Default slave_config routine for libata devices
3512 * @sdev: SCSI device to configure
3513 * @ap: ATA port to which SCSI device is attached
3514 *
3515 * RETURNS:
3516 * Zero.
3517 */
3518
3519 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
3520 {
3521 ata_scsi_sdev_config(sdev);
3522 ata_scsi_dev_config(sdev, ap->link.device);
3523 return 0;
3524 }
3525 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3526
3527 /**
3528 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3529 * @cmd: SCSI command to be sent
3530 * @done: Completion function, called when command is complete
3531 * @ap: ATA port to which the command is being sent
3532 *
3533 * RETURNS:
3534 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3535 * 0 otherwise.
3536 */
3537
3538 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
3539 struct ata_port *ap)
3540 {
3541 int rc = 0;
3542
3543 ata_scsi_dump_cdb(ap, cmd);
3544
3545 if (likely(ata_scsi_dev_enabled(ap->link.device)))
3546 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device);
3547 else {
3548 cmd->result = (DID_BAD_TARGET << 16);
3549 done(cmd);
3550 }
3551 return rc;
3552 }
3553 EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
kernel source for telekom puls (alcatel/mediatek)