2 * libata-scsi.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
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)
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.
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.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from
31 * - http://www.t10.org/
32 * - http://www.t13.org/
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 <linux/uaccess.h>
52 #define SECTOR_SIZE 512
54 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
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);
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
74 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
76 RW_RECOVERY_MPAGE_LEN - 2,
78 0, /* read retry count */
80 0, /* write retry count */
84 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
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 */
93 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
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 */
103 * libata transport template. libata doesn't do real transport stuff.
104 * It just needs the eh_timed_out hook.
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,
113 static const struct {
116 } link_pm_policy[] = {
117 { NOT_AVAILABLE, "max_performance" },
118 { MIN_POWER, "min_power" },
119 { MAX_PERFORMANCE, "max_performance" },
120 { MEDIUM_POWER, "medium_power" },
123 static const char *ata_scsi_lpm_get(enum link_pm policy)
127 for (i = 0; i < ARRAY_SIZE(link_pm_policy); i++)
128 if (link_pm_policy[i].value == policy)
129 return link_pm_policy[i].name;
134 static ssize_t ata_scsi_lpm_put(struct device *dev,
135 struct device_attribute *attr,
136 const char *buf, size_t count)
138 struct Scsi_Host *shost = class_to_shost(dev);
139 struct ata_port *ap = ata_shost_to_port(shost);
140 enum link_pm policy = 0;
144 * we are skipping array location 0 on purpose - this
145 * is because a value of NOT_AVAILABLE is displayed
146 * to the user as max_performance, but when the user
147 * writes "max_performance", they actually want the
148 * value to match MAX_PERFORMANCE.
150 for (i = 1; i < ARRAY_SIZE(link_pm_policy); i++) {
151 const int len = strlen(link_pm_policy[i].name);
152 if (strncmp(link_pm_policy[i].name, buf, len) == 0 &&
154 policy = link_pm_policy[i].value;
161 ata_lpm_schedule(ap, policy);
166 ata_scsi_lpm_show(struct device *dev, struct device_attribute *attr, char *buf)
168 struct Scsi_Host *shost = class_to_shost(dev);
169 struct ata_port *ap = ata_shost_to_port(shost);
171 ata_scsi_lpm_get(ap->pm_policy);
176 return snprintf(buf, 23, "%s\n", policy);
178 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
179 ata_scsi_lpm_show, ata_scsi_lpm_put);
180 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
182 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
184 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
186 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
189 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
190 void (*done)(struct scsi_cmnd *))
192 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
193 /* "Invalid field in cbd" */
198 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
199 * @sdev: SCSI device for which BIOS geometry is to be determined
200 * @bdev: block device associated with @sdev
201 * @capacity: capacity of SCSI device
202 * @geom: location to which geometry will be output
204 * Generic bios head/sector/cylinder calculator
205 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
206 * mapping. Some situations may arise where the disk is not
207 * bootable if this is not used.
210 * Defined by the SCSI layer. We don't really care.
215 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
216 sector_t capacity, int geom[])
220 sector_div(capacity, 255*63);
227 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
228 * @sdev: SCSI device to get identify data for
229 * @arg: User buffer area for identify data
232 * Defined by the SCSI layer. We don't really care.
235 * Zero on success, negative errno on error.
237 static int ata_get_identity(struct scsi_device *sdev, void __user *arg)
239 struct ata_port *ap = ata_shost_to_port(sdev->host);
240 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
241 u16 __user *dst = arg;
247 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
250 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
251 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
254 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
255 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
258 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
259 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
266 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
267 * @scsidev: Device to which we are issuing command
268 * @arg: User provided data for issuing command
271 * Defined by the SCSI layer. We don't really care.
274 * Zero on success, negative errno on error.
276 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
279 u8 scsi_cmd[MAX_COMMAND_SIZE];
280 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
282 enum dma_data_direction data_dir;
288 if (copy_from_user(args, arg, sizeof(args)))
291 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
295 memset(scsi_cmd, 0, sizeof(scsi_cmd));
298 argsize = SECTOR_SIZE * args[3];
299 argbuf = kmalloc(argsize, GFP_KERNEL);
300 if (argbuf == NULL) {
305 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
306 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
307 block count in sector count field */
308 data_dir = DMA_FROM_DEVICE;
310 scsi_cmd[1] = (3 << 1); /* Non-data */
311 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
315 scsi_cmd[0] = ATA_16;
317 scsi_cmd[4] = args[2];
318 if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */
319 scsi_cmd[6] = args[3];
320 scsi_cmd[8] = args[1];
324 scsi_cmd[6] = args[1];
326 scsi_cmd[14] = args[0];
328 /* Good values for timeout and retries? Values below
329 from scsi_ioctl_send_command() for default case... */
330 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
331 sensebuf, (10*HZ), 5, 0);
333 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
334 u8 *desc = sensebuf + 8;
335 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
337 /* If we set cc then ATA pass-through will cause a
338 * check condition even if no error. Filter that. */
339 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
340 struct scsi_sense_hdr sshdr;
341 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
343 if (sshdr.sense_key == 0 &&
344 sshdr.asc == 0 && sshdr.ascq == 0)
345 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
348 /* Send userspace a few ATA registers (same as drivers/ide) */
349 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
350 desc[0] == 0x09) { /* code is "ATA Descriptor" */
351 args[0] = desc[13]; /* status */
352 args[1] = desc[3]; /* error */
353 args[2] = desc[5]; /* sector count (0:7) */
354 if (copy_to_user(arg, args, sizeof(args)))
366 && copy_to_user(arg + sizeof(args), argbuf, argsize))
375 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
376 * @scsidev: Device to which we are issuing command
377 * @arg: User provided data for issuing command
380 * Defined by the SCSI layer. We don't really care.
383 * Zero on success, negative errno on error.
385 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
388 u8 scsi_cmd[MAX_COMMAND_SIZE];
389 u8 args[7], *sensebuf = NULL;
395 if (copy_from_user(args, arg, sizeof(args)))
398 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
402 memset(scsi_cmd, 0, sizeof(scsi_cmd));
403 scsi_cmd[0] = ATA_16;
404 scsi_cmd[1] = (3 << 1); /* Non-data */
405 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
406 scsi_cmd[4] = args[1];
407 scsi_cmd[6] = args[2];
408 scsi_cmd[8] = args[3];
409 scsi_cmd[10] = args[4];
410 scsi_cmd[12] = args[5];
411 scsi_cmd[13] = args[6] & 0x4f;
412 scsi_cmd[14] = args[0];
414 /* Good values for timeout and retries? Values below
415 from scsi_ioctl_send_command() for default case... */
416 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
417 sensebuf, (10*HZ), 5, 0);
419 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
420 u8 *desc = sensebuf + 8;
421 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
423 /* If we set cc then ATA pass-through will cause a
424 * check condition even if no error. Filter that. */
425 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
426 struct scsi_sense_hdr sshdr;
427 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
429 if (sshdr.sense_key == 0 &&
430 sshdr.asc == 0 && sshdr.ascq == 0)
431 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
434 /* Send userspace ATA registers */
435 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
436 desc[0] == 0x09) {/* code is "ATA Descriptor" */
437 args[0] = desc[13]; /* status */
438 args[1] = desc[3]; /* error */
439 args[2] = desc[5]; /* sector count (0:7) */
440 args[3] = desc[7]; /* lbal */
441 args[4] = desc[9]; /* lbam */
442 args[5] = desc[11]; /* lbah */
443 args[6] = desc[12]; /* select */
444 if (copy_to_user(arg, args, sizeof(args)))
459 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
461 int val = -EINVAL, rc = -EINVAL;
464 case ATA_IOC_GET_IO32:
466 if (copy_to_user(arg, &val, 1))
470 case ATA_IOC_SET_IO32:
471 val = (unsigned long) arg;
476 case HDIO_GET_IDENTITY:
477 return ata_get_identity(scsidev, arg);
480 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
482 return ata_cmd_ioctl(scsidev, arg);
484 case HDIO_DRIVE_TASK:
485 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
487 return ata_task_ioctl(scsidev, arg);
498 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
499 * @dev: ATA device to which the new command is attached
500 * @cmd: SCSI command that originated this ATA command
501 * @done: SCSI command completion function
503 * Obtain a reference to an unused ata_queued_cmd structure,
504 * which is the basic libata structure representing a single
505 * ATA command sent to the hardware.
507 * If a command was available, fill in the SCSI-specific
508 * portions of the structure with information on the
512 * spin_lock_irqsave(host lock)
515 * Command allocated, or %NULL if none available.
517 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
518 struct scsi_cmnd *cmd,
519 void (*done)(struct scsi_cmnd *))
521 struct ata_queued_cmd *qc;
523 qc = ata_qc_new_init(dev);
528 qc->sg = scsi_sglist(cmd);
529 qc->n_elem = scsi_sg_count(cmd);
531 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
538 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
540 struct scsi_cmnd *scmd = qc->scsicmd;
542 qc->extrabytes = scmd->request->extra_len;
543 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
547 * ata_dump_status - user friendly display of error info
548 * @id: id of the port in question
549 * @tf: ptr to filled out taskfile
551 * Decode and dump the ATA error/status registers for the user so
552 * that they have some idea what really happened at the non
553 * make-believe layer.
556 * inherited from caller
558 static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
560 u8 stat = tf->command, err = tf->feature;
562 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
563 if (stat & ATA_BUSY) {
564 printk("Busy }\n"); /* Data is not valid in this case */
566 if (stat & 0x40) printk("DriveReady ");
567 if (stat & 0x20) printk("DeviceFault ");
568 if (stat & 0x10) printk("SeekComplete ");
569 if (stat & 0x08) printk("DataRequest ");
570 if (stat & 0x04) printk("CorrectedError ");
571 if (stat & 0x02) printk("Index ");
572 if (stat & 0x01) printk("Error ");
576 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
577 if (err & 0x04) printk("DriveStatusError ");
579 if (err & 0x04) printk("BadCRC ");
580 else printk("Sector ");
582 if (err & 0x40) printk("UncorrectableError ");
583 if (err & 0x10) printk("SectorIdNotFound ");
584 if (err & 0x02) printk("TrackZeroNotFound ");
585 if (err & 0x01) printk("AddrMarkNotFound ");
592 * ata_to_sense_error - convert ATA error to SCSI error
593 * @id: ATA device number
594 * @drv_stat: value contained in ATA status register
595 * @drv_err: value contained in ATA error register
596 * @sk: the sense key we'll fill out
597 * @asc: the additional sense code we'll fill out
598 * @ascq: the additional sense code qualifier we'll fill out
599 * @verbose: be verbose
601 * Converts an ATA error into a SCSI error. Fill out pointers to
602 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
603 * format sense blocks.
606 * spin_lock_irqsave(host lock)
608 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
609 u8 *asc, u8 *ascq, int verbose)
613 /* Based on the 3ware driver translation table */
614 static const unsigned char sense_table[][4] = {
616 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
618 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
620 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
621 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
622 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
623 /* MC|ID|ABRT|TRK0|MARK */
624 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
626 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
627 /* Bad address mark */
628 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
630 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
632 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
633 /* Media change request */
634 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
636 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
638 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
640 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
641 /* BBD - block marked bad */
642 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
643 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
645 static const unsigned char stat_table[][4] = {
646 /* Must be first because BUSY means no other bits valid */
647 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
648 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
649 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
650 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
651 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
655 * Is this an error we can process/parse
657 if (drv_stat & ATA_BUSY) {
658 drv_err = 0; /* Ignore the err bits, they're invalid */
662 /* Look for drv_err */
663 for (i = 0; sense_table[i][0] != 0xFF; i++) {
664 /* Look for best matches first */
665 if ((sense_table[i][0] & drv_err) ==
667 *sk = sense_table[i][1];
668 *asc = sense_table[i][2];
669 *ascq = sense_table[i][3];
673 /* No immediate match */
675 printk(KERN_WARNING "ata%u: no sense translation for "
676 "error 0x%02x\n", id, drv_err);
679 /* Fall back to interpreting status bits */
680 for (i = 0; stat_table[i][0] != 0xFF; i++) {
681 if (stat_table[i][0] & drv_stat) {
682 *sk = stat_table[i][1];
683 *asc = stat_table[i][2];
684 *ascq = stat_table[i][3];
688 /* No error? Undecoded? */
690 printk(KERN_WARNING "ata%u: no sense translation for "
691 "status: 0x%02x\n", id, drv_stat);
693 /* We need a sensible error return here, which is tricky, and one
694 that won't cause people to do things like return a disk wrongly */
695 *sk = ABORTED_COMMAND;
701 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
702 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
703 id, drv_stat, drv_err, *sk, *asc, *ascq);
708 * ata_gen_passthru_sense - Generate check condition sense block.
709 * @qc: Command that completed.
711 * This function is specific to the ATA descriptor format sense
712 * block specified for the ATA pass through commands. Regardless
713 * of whether the command errored or not, return a sense
714 * block. Copy all controller registers into the sense
715 * block. Clear sense key, ASC & ASCQ if there is no error.
720 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
722 struct scsi_cmnd *cmd = qc->scsicmd;
723 struct ata_taskfile *tf = &qc->result_tf;
724 unsigned char *sb = cmd->sense_buffer;
725 unsigned char *desc = sb + 8;
726 int verbose = qc->ap->ops->error_handler == NULL;
728 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
730 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
733 * Use ata_to_sense_error() to map status register bits
734 * onto sense key, asc & ascq.
737 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
738 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
739 &sb[1], &sb[2], &sb[3], verbose);
744 * Sense data is current and format is descriptor.
750 /* set length of additional sense data */
755 * Copy registers into sense buffer.
758 desc[3] = tf->feature; /* == error reg */
763 desc[12] = tf->device;
764 desc[13] = tf->command; /* == status reg */
767 * Fill in Extend bit, and the high order bytes
770 if (tf->flags & ATA_TFLAG_LBA48) {
772 desc[4] = tf->hob_nsect;
773 desc[6] = tf->hob_lbal;
774 desc[8] = tf->hob_lbam;
775 desc[10] = tf->hob_lbah;
780 * ata_gen_ata_sense - generate a SCSI fixed sense block
781 * @qc: Command that we are erroring out
783 * Generate sense block for a failed ATA command @qc. Descriptor
784 * format is used to accomodate LBA48 block address.
789 static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
791 struct ata_device *dev = qc->dev;
792 struct scsi_cmnd *cmd = qc->scsicmd;
793 struct ata_taskfile *tf = &qc->result_tf;
794 unsigned char *sb = cmd->sense_buffer;
795 unsigned char *desc = sb + 8;
796 int verbose = qc->ap->ops->error_handler == NULL;
799 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
801 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
803 /* sense data is current and format is descriptor */
806 /* Use ata_to_sense_error() to map status register bits
807 * onto sense key, asc & ascq.
810 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
811 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
812 &sb[1], &sb[2], &sb[3], verbose);
816 block = ata_tf_read_block(&qc->result_tf, dev);
818 /* information sense data descriptor */
823 desc[2] |= 0x80; /* valid */
824 desc[6] = block >> 40;
825 desc[7] = block >> 32;
826 desc[8] = block >> 24;
827 desc[9] = block >> 16;
828 desc[10] = block >> 8;
832 static void ata_scsi_sdev_config(struct scsi_device *sdev)
834 sdev->use_10_for_rw = 1;
835 sdev->use_10_for_ms = 1;
837 /* Schedule policy is determined by ->qc_defer() callback and
838 * it needs to see every deferred qc. Set dev_blocked to 1 to
839 * prevent SCSI midlayer from automatically deferring
842 sdev->max_device_blocked = 1;
846 * atapi_drain_needed - Check whether data transfer may overflow
847 * @rq: request to be checked
849 * ATAPI commands which transfer variable length data to host
850 * might overflow due to application error or hardare bug. This
851 * function checks whether overflow should be drained and ignored
858 * 1 if ; otherwise, 0.
860 static int atapi_drain_needed(struct request *rq)
862 if (likely(!blk_pc_request(rq)))
865 if (!rq->data_len || (rq->cmd_flags & REQ_RW))
868 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
871 static int ata_scsi_dev_config(struct scsi_device *sdev,
872 struct ata_device *dev)
874 /* configure max sectors */
875 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);
877 if (dev->class == ATA_DEV_ATAPI) {
878 struct request_queue *q = sdev->request_queue;
881 /* set the min alignment and padding */
882 blk_queue_update_dma_alignment(sdev->request_queue,
884 blk_queue_dma_pad(sdev->request_queue, ATA_DMA_PAD_SZ - 1);
886 /* configure draining */
887 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
889 ata_dev_printk(dev, KERN_ERR,
890 "drain buffer allocation failed\n");
894 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
896 /* ATA devices must be sector aligned */
897 blk_queue_update_dma_alignment(sdev->request_queue,
899 sdev->manage_start_stop = 1;
902 if (dev->flags & ATA_DFLAG_AN)
903 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
905 if (dev->flags & ATA_DFLAG_NCQ) {
908 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
909 depth = min(ATA_MAX_QUEUE - 1, depth);
910 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
917 * ata_scsi_slave_config - Set SCSI device attributes
918 * @sdev: SCSI device to examine
920 * This is called before we actually start reading
921 * and writing to the device, to configure certain
922 * SCSI mid-layer behaviors.
925 * Defined by SCSI layer. We don't really care.
928 int ata_scsi_slave_config(struct scsi_device *sdev)
930 struct ata_port *ap = ata_shost_to_port(sdev->host);
931 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
934 ata_scsi_sdev_config(sdev);
937 rc = ata_scsi_dev_config(sdev, dev);
943 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
944 * @sdev: SCSI device to be destroyed
946 * @sdev is about to be destroyed for hot/warm unplugging. If
947 * this unplugging was initiated by libata as indicated by NULL
948 * dev->sdev, this function doesn't have to do anything.
949 * Otherwise, SCSI layer initiated warm-unplug is in progress.
950 * Clear dev->sdev, schedule the device for ATA detach and invoke
954 * Defined by SCSI layer. We don't really care.
956 void ata_scsi_slave_destroy(struct scsi_device *sdev)
958 struct ata_port *ap = ata_shost_to_port(sdev->host);
959 struct request_queue *q = sdev->request_queue;
961 struct ata_device *dev;
963 if (!ap->ops->error_handler)
966 spin_lock_irqsave(ap->lock, flags);
967 dev = __ata_scsi_find_dev(ap, sdev);
968 if (dev && dev->sdev) {
969 /* SCSI device already in CANCEL state, no need to offline it */
971 dev->flags |= ATA_DFLAG_DETACH;
972 ata_port_schedule_eh(ap);
974 spin_unlock_irqrestore(ap->lock, flags);
976 kfree(q->dma_drain_buffer);
977 q->dma_drain_buffer = NULL;
978 q->dma_drain_size = 0;
982 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
983 * @sdev: SCSI device to configure queue depth for
984 * @queue_depth: new queue depth
986 * This is libata standard hostt->change_queue_depth callback.
987 * SCSI will call into this callback when user tries to set queue
991 * SCSI layer (we don't care)
994 * Newly configured queue depth.
996 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
998 struct ata_port *ap = ata_shost_to_port(sdev->host);
999 struct ata_device *dev;
1000 unsigned long flags;
1002 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1003 return sdev->queue_depth;
1005 dev = ata_scsi_find_dev(ap, sdev);
1006 if (!dev || !ata_dev_enabled(dev))
1007 return sdev->queue_depth;
1010 spin_lock_irqsave(ap->lock, flags);
1011 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1012 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1013 dev->flags |= ATA_DFLAG_NCQ_OFF;
1016 spin_unlock_irqrestore(ap->lock, flags);
1018 /* limit and apply queue depth */
1019 queue_depth = min(queue_depth, sdev->host->can_queue);
1020 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1021 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1023 if (sdev->queue_depth == queue_depth)
1026 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
1030 /* XXX: for spindown warning */
1031 static void ata_delayed_done_timerfn(unsigned long arg)
1033 struct scsi_cmnd *scmd = (void *)arg;
1035 scmd->scsi_done(scmd);
1038 /* XXX: for spindown warning */
1039 static void ata_delayed_done(struct scsi_cmnd *scmd)
1041 static struct timer_list timer;
1043 setup_timer(&timer, ata_delayed_done_timerfn, (unsigned long)scmd);
1044 mod_timer(&timer, jiffies + 5 * HZ);
1048 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1049 * @qc: Storage for translated ATA taskfile
1051 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1052 * (to start). Perhaps these commands should be preceded by
1053 * CHECK POWER MODE to see what power mode the device is already in.
1054 * [See SAT revision 5 at www.t10.org]
1057 * spin_lock_irqsave(host lock)
1060 * Zero on success, non-zero on error.
1062 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1064 struct scsi_cmnd *scmd = qc->scsicmd;
1065 struct ata_taskfile *tf = &qc->tf;
1066 const u8 *cdb = scmd->cmnd;
1068 if (scmd->cmd_len < 5)
1071 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1072 tf->protocol = ATA_PROT_NODATA;
1074 ; /* ignore IMMED bit, violates sat-r05 */
1077 goto invalid_fld; /* LOEJ bit set not supported */
1078 if (((cdb[4] >> 4) & 0xf) != 0)
1079 goto invalid_fld; /* power conditions not supported */
1081 if (qc->dev->horkage & ATA_HORKAGE_SKIP_PM) {
1082 /* the device lacks PM support, finish without doing anything */
1083 scmd->result = SAM_STAT_GOOD;
1088 tf->nsect = 1; /* 1 sector, lba=0 */
1090 if (qc->dev->flags & ATA_DFLAG_LBA) {
1091 tf->flags |= ATA_TFLAG_LBA;
1096 tf->device |= ATA_LBA;
1099 tf->lbal = 0x1; /* sect */
1100 tf->lbam = 0x0; /* cyl low */
1101 tf->lbah = 0x0; /* cyl high */
1104 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
1106 /* XXX: This is for backward compatibility, will be
1107 * removed. Read Documentation/feature-removal-schedule.txt
1110 if ((qc->dev->flags & ATA_DFLAG_SPUNDOWN) &&
1111 (system_state == SYSTEM_HALT ||
1112 system_state == SYSTEM_POWER_OFF)) {
1113 static unsigned long warned;
1115 if (!test_and_set_bit(0, &warned)) {
1116 ata_dev_printk(qc->dev, KERN_WARNING,
1117 "DISK MIGHT NOT BE SPUN DOWN PROPERLY. "
1118 "UPDATE SHUTDOWN UTILITY\n");
1119 ata_dev_printk(qc->dev, KERN_WARNING,
1120 "For more info, visit "
1121 "http://linux-ata.org/shutdown.html\n");
1123 /* ->scsi_done is not used, use it for
1124 * delayed completion.
1126 scmd->scsi_done = qc->scsidone;
1127 qc->scsidone = ata_delayed_done;
1129 scmd->result = SAM_STAT_GOOD;
1133 /* Issue ATA STANDBY IMMEDIATE command */
1134 tf->command = ATA_CMD_STANDBYNOW1;
1138 * Standby and Idle condition timers could be implemented but that
1139 * would require libata to implement the Power condition mode page
1140 * and allow the user to change it. Changing mode pages requires
1141 * MODE SELECT to be implemented.
1147 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1148 /* "Invalid field in cbd" */
1154 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1155 * @qc: Storage for translated ATA taskfile
1157 * Sets up an ATA taskfile to issue FLUSH CACHE or
1161 * spin_lock_irqsave(host lock)
1164 * Zero on success, non-zero on error.
1166 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1168 struct ata_taskfile *tf = &qc->tf;
1170 tf->flags |= ATA_TFLAG_DEVICE;
1171 tf->protocol = ATA_PROT_NODATA;
1173 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1174 tf->command = ATA_CMD_FLUSH_EXT;
1176 tf->command = ATA_CMD_FLUSH;
1178 /* flush is critical for IO integrity, consider it an IO command */
1179 qc->flags |= ATA_QCFLAG_IO;
1185 * scsi_6_lba_len - Get LBA and transfer length
1186 * @cdb: SCSI command to translate
1188 * Calculate LBA and transfer length for 6-byte commands.
1192 * @plen: the transfer length
1194 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1199 VPRINTK("six-byte command\n");
1201 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1202 lba |= ((u64)cdb[2]) << 8;
1203 lba |= ((u64)cdb[3]);
1212 * scsi_10_lba_len - Get LBA and transfer length
1213 * @cdb: SCSI command to translate
1215 * Calculate LBA and transfer length for 10-byte commands.
1219 * @plen: the transfer length
1221 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1226 VPRINTK("ten-byte command\n");
1228 lba |= ((u64)cdb[2]) << 24;
1229 lba |= ((u64)cdb[3]) << 16;
1230 lba |= ((u64)cdb[4]) << 8;
1231 lba |= ((u64)cdb[5]);
1233 len |= ((u32)cdb[7]) << 8;
1234 len |= ((u32)cdb[8]);
1241 * scsi_16_lba_len - Get LBA and transfer length
1242 * @cdb: SCSI command to translate
1244 * Calculate LBA and transfer length for 16-byte commands.
1248 * @plen: the transfer length
1250 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1255 VPRINTK("sixteen-byte command\n");
1257 lba |= ((u64)cdb[2]) << 56;
1258 lba |= ((u64)cdb[3]) << 48;
1259 lba |= ((u64)cdb[4]) << 40;
1260 lba |= ((u64)cdb[5]) << 32;
1261 lba |= ((u64)cdb[6]) << 24;
1262 lba |= ((u64)cdb[7]) << 16;
1263 lba |= ((u64)cdb[8]) << 8;
1264 lba |= ((u64)cdb[9]);
1266 len |= ((u32)cdb[10]) << 24;
1267 len |= ((u32)cdb[11]) << 16;
1268 len |= ((u32)cdb[12]) << 8;
1269 len |= ((u32)cdb[13]);
1276 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1277 * @qc: Storage for translated ATA taskfile
1279 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1282 * spin_lock_irqsave(host lock)
1285 * Zero on success, non-zero on error.
1287 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1289 struct scsi_cmnd *scmd = qc->scsicmd;
1290 struct ata_taskfile *tf = &qc->tf;
1291 struct ata_device *dev = qc->dev;
1292 u64 dev_sectors = qc->dev->n_sectors;
1293 const u8 *cdb = scmd->cmnd;
1297 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1298 tf->protocol = ATA_PROT_NODATA;
1300 if (cdb[0] == VERIFY) {
1301 if (scmd->cmd_len < 10)
1303 scsi_10_lba_len(cdb, &block, &n_block);
1304 } else if (cdb[0] == VERIFY_16) {
1305 if (scmd->cmd_len < 16)
1307 scsi_16_lba_len(cdb, &block, &n_block);
1313 if (block >= dev_sectors)
1315 if ((block + n_block) > dev_sectors)
1318 if (dev->flags & ATA_DFLAG_LBA) {
1319 tf->flags |= ATA_TFLAG_LBA;
1321 if (lba_28_ok(block, n_block)) {
1323 tf->command = ATA_CMD_VERIFY;
1324 tf->device |= (block >> 24) & 0xf;
1325 } else if (lba_48_ok(block, n_block)) {
1326 if (!(dev->flags & ATA_DFLAG_LBA48))
1330 tf->flags |= ATA_TFLAG_LBA48;
1331 tf->command = ATA_CMD_VERIFY_EXT;
1333 tf->hob_nsect = (n_block >> 8) & 0xff;
1335 tf->hob_lbah = (block >> 40) & 0xff;
1336 tf->hob_lbam = (block >> 32) & 0xff;
1337 tf->hob_lbal = (block >> 24) & 0xff;
1339 /* request too large even for LBA48 */
1342 tf->nsect = n_block & 0xff;
1344 tf->lbah = (block >> 16) & 0xff;
1345 tf->lbam = (block >> 8) & 0xff;
1346 tf->lbal = block & 0xff;
1348 tf->device |= ATA_LBA;
1351 u32 sect, head, cyl, track;
1353 if (!lba_28_ok(block, n_block))
1356 /* Convert LBA to CHS */
1357 track = (u32)block / dev->sectors;
1358 cyl = track / dev->heads;
1359 head = track % dev->heads;
1360 sect = (u32)block % dev->sectors + 1;
1362 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1363 (u32)block, track, cyl, head, sect);
1365 /* Check whether the converted CHS can fit.
1369 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1372 tf->command = ATA_CMD_VERIFY;
1373 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1376 tf->lbah = cyl >> 8;
1383 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1384 /* "Invalid field in cbd" */
1388 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1389 /* "Logical Block Address out of range" */
1393 scmd->result = SAM_STAT_GOOD;
1398 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1399 * @qc: Storage for translated ATA taskfile
1401 * Converts any of six SCSI read/write commands into the
1402 * ATA counterpart, including starting sector (LBA),
1403 * sector count, and taking into account the device's LBA48
1406 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1407 * %WRITE_16 are currently supported.
1410 * spin_lock_irqsave(host lock)
1413 * Zero on success, non-zero on error.
1415 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1417 struct scsi_cmnd *scmd = qc->scsicmd;
1418 const u8 *cdb = scmd->cmnd;
1419 unsigned int tf_flags = 0;
1424 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1425 tf_flags |= ATA_TFLAG_WRITE;
1427 /* Calculate the SCSI LBA, transfer length and FUA. */
1431 if (unlikely(scmd->cmd_len < 10))
1433 scsi_10_lba_len(cdb, &block, &n_block);
1434 if (unlikely(cdb[1] & (1 << 3)))
1435 tf_flags |= ATA_TFLAG_FUA;
1439 if (unlikely(scmd->cmd_len < 6))
1441 scsi_6_lba_len(cdb, &block, &n_block);
1443 /* for 6-byte r/w commands, transfer length 0
1444 * means 256 blocks of data, not 0 block.
1451 if (unlikely(scmd->cmd_len < 16))
1453 scsi_16_lba_len(cdb, &block, &n_block);
1454 if (unlikely(cdb[1] & (1 << 3)))
1455 tf_flags |= ATA_TFLAG_FUA;
1458 DPRINTK("no-byte command\n");
1462 /* Check and compose ATA command */
1464 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1465 * length 0 means transfer 0 block of data.
1466 * However, for ATA R/W commands, sector count 0 means
1467 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1469 * WARNING: one or two older ATA drives treat 0 as 0...
1473 qc->flags |= ATA_QCFLAG_IO;
1474 qc->nbytes = n_block * ATA_SECT_SIZE;
1476 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1478 if (likely(rc == 0))
1483 /* treat all other errors as -EINVAL, fall through */
1485 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1486 /* "Invalid field in cbd" */
1490 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1491 /* "Logical Block Address out of range" */
1495 scmd->result = SAM_STAT_GOOD;
1499 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1501 struct ata_port *ap = qc->ap;
1502 struct scsi_cmnd *cmd = qc->scsicmd;
1503 u8 *cdb = cmd->cmnd;
1504 int need_sense = (qc->err_mask != 0);
1506 /* For ATA pass thru (SAT) commands, generate a sense block if
1507 * user mandated it or if there's an error. Note that if we
1508 * generate because the user forced us to, a check condition
1509 * is generated and the ATA register values are returned
1510 * whether the command completed successfully or not. If there
1511 * was no error, SK, ASC and ASCQ will all be zero.
1513 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1514 ((cdb[2] & 0x20) || need_sense)) {
1515 ata_gen_passthru_sense(qc);
1518 cmd->result = SAM_STAT_GOOD;
1520 /* TODO: decide which descriptor format to use
1521 * for 48b LBA devices and call that here
1522 * instead of the fixed desc, which is only
1523 * good for smaller LBA (and maybe CHS?)
1526 ata_gen_ata_sense(qc);
1530 /* XXX: track spindown state for spindown skipping and warning */
1531 if (unlikely(qc->tf.command == ATA_CMD_STANDBY ||
1532 qc->tf.command == ATA_CMD_STANDBYNOW1))
1533 qc->dev->flags |= ATA_DFLAG_SPUNDOWN;
1534 else if (likely(system_state != SYSTEM_HALT &&
1535 system_state != SYSTEM_POWER_OFF))
1536 qc->dev->flags &= ~ATA_DFLAG_SPUNDOWN;
1538 if (need_sense && !ap->ops->error_handler)
1539 ata_dump_status(ap->print_id, &qc->result_tf);
1547 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1548 * @dev: ATA device to which the command is addressed
1549 * @cmd: SCSI command to execute
1550 * @done: SCSI command completion function
1551 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1553 * Our ->queuecommand() function has decided that the SCSI
1554 * command issued can be directly translated into an ATA
1555 * command, rather than handled internally.
1557 * This function sets up an ata_queued_cmd structure for the
1558 * SCSI command, and sends that ata_queued_cmd to the hardware.
1560 * The xlat_func argument (actor) returns 0 if ready to execute
1561 * ATA command, else 1 to finish translation. If 1 is returned
1562 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1563 * to be set reflecting an error condition or clean (early)
1567 * spin_lock_irqsave(host lock)
1570 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1571 * needs to be deferred.
1573 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1574 void (*done)(struct scsi_cmnd *),
1575 ata_xlat_func_t xlat_func)
1577 struct ata_port *ap = dev->link->ap;
1578 struct ata_queued_cmd *qc;
1583 qc = ata_scsi_qc_new(dev, cmd, done);
1587 /* data is present; dma-map it */
1588 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1589 cmd->sc_data_direction == DMA_TO_DEVICE) {
1590 if (unlikely(scsi_bufflen(cmd) < 1)) {
1591 ata_dev_printk(dev, KERN_WARNING,
1592 "WARNING: zero len r/w req\n");
1596 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1598 qc->dma_dir = cmd->sc_data_direction;
1601 qc->complete_fn = ata_scsi_qc_complete;
1606 if (ap->ops->qc_defer) {
1607 if ((rc = ap->ops->qc_defer(qc)))
1611 /* select device, send command to hardware */
1620 DPRINTK("EXIT - early finish (good or error)\n");
1625 cmd->result = (DID_ERROR << 16);
1628 DPRINTK("EXIT - internal\n");
1633 DPRINTK("EXIT - defer\n");
1634 if (rc == ATA_DEFER_LINK)
1635 return SCSI_MLQUEUE_DEVICE_BUSY;
1637 return SCSI_MLQUEUE_HOST_BUSY;
1641 * ata_scsi_rbuf_get - Map response buffer.
1642 * @cmd: SCSI command containing buffer to be mapped.
1643 * @buf_out: Pointer to mapped area.
1645 * Maps buffer contained within SCSI command @cmd.
1648 * spin_lock_irqsave(host lock)
1651 * Length of response buffer.
1654 static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
1657 unsigned int buflen;
1659 struct scatterlist *sg = scsi_sglist(cmd);
1662 buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
1663 buflen = sg->length;
1674 * ata_scsi_rbuf_put - Unmap response buffer.
1675 * @cmd: SCSI command containing buffer to be unmapped.
1676 * @buf: buffer to unmap
1678 * Unmaps response buffer contained within @cmd.
1681 * spin_lock_irqsave(host lock)
1684 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
1686 struct scatterlist *sg = scsi_sglist(cmd);
1688 kunmap_atomic(buf - sg->offset, KM_IRQ0);
1692 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1693 * @args: device IDENTIFY data / SCSI command of interest.
1694 * @actor: Callback hook for desired SCSI command simulator
1696 * Takes care of the hard work of simulating a SCSI command...
1697 * Mapping the response buffer, calling the command's handler,
1698 * and handling the handler's return value. This return value
1699 * indicates whether the handler wishes the SCSI command to be
1700 * completed successfully (0), or not (in which case cmd->result
1701 * and sense buffer are assumed to be set).
1704 * spin_lock_irqsave(host lock)
1706 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1707 unsigned int (*actor)(struct ata_scsi_args *args,
1708 u8 *rbuf, unsigned int buflen))
1711 unsigned int buflen, rc;
1712 struct scsi_cmnd *cmd = args->cmd;
1713 unsigned long flags;
1715 local_irq_save(flags);
1717 buflen = ata_scsi_rbuf_get(cmd, &rbuf);
1718 memset(rbuf, 0, buflen);
1719 rc = actor(args, rbuf, buflen);
1720 ata_scsi_rbuf_put(cmd, rbuf);
1722 local_irq_restore(flags);
1725 cmd->result = SAM_STAT_GOOD;
1730 * ATA_SCSI_RBUF_SET - helper to set values in SCSI response buffer
1731 * @idx: byte index into SCSI response buffer
1732 * @val: value to set
1734 * To be used by SCSI command simulator functions. This macros
1735 * expects two local variables, u8 *rbuf and unsigned int buflen,
1741 #define ATA_SCSI_RBUF_SET(idx, val) do { \
1742 if ((idx) < buflen) rbuf[(idx)] = (u8)(val); \
1746 * ata_scsiop_inq_std - Simulate INQUIRY command
1747 * @args: device IDENTIFY data / SCSI command of interest.
1748 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1749 * @buflen: Response buffer length.
1751 * Returns standard device identification data associated
1752 * with non-VPD INQUIRY command output.
1755 * spin_lock_irqsave(host lock)
1757 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
1758 unsigned int buflen)
1763 0x5, /* claim SPC-3 version compatibility */
1768 /* set scsi removeable (RMB) bit per ata bit */
1769 if (ata_id_removeable(args->id))
1774 memcpy(rbuf, hdr, sizeof(hdr));
1777 memcpy(&rbuf[8], "ATA ", 8);
1778 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1779 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1780 if (rbuf[32] == 0 || rbuf[32] == ' ')
1781 memcpy(&rbuf[32], "n/a ", 4);
1785 const u8 versions[] = {
1786 0x60, /* SAM-3 (no version claimed) */
1789 0x20, /* SBC-2 (no version claimed) */
1792 0x60 /* SPC-3 (no version claimed) */
1795 memcpy(rbuf + 59, versions, sizeof(versions));
1802 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1803 * @args: device IDENTIFY data / SCSI command of interest.
1804 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1805 * @buflen: Response buffer length.
1807 * Returns list of inquiry VPD pages available.
1810 * spin_lock_irqsave(host lock)
1812 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
1813 unsigned int buflen)
1815 const u8 pages[] = {
1816 0x00, /* page 0x00, this page */
1817 0x80, /* page 0x80, unit serial no page */
1818 0x83 /* page 0x83, device ident page */
1820 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
1823 memcpy(rbuf + 4, pages, sizeof(pages));
1829 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1830 * @args: device IDENTIFY data / SCSI command of interest.
1831 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1832 * @buflen: Response buffer length.
1834 * Returns ATA device serial number.
1837 * spin_lock_irqsave(host lock)
1839 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
1840 unsigned int buflen)
1844 0x80, /* this page code */
1846 ATA_ID_SERNO_LEN, /* page len */
1848 memcpy(rbuf, hdr, sizeof(hdr));
1850 if (buflen > (ATA_ID_SERNO_LEN + 4 - 1))
1851 ata_id_string(args->id, (unsigned char *) &rbuf[4],
1852 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1858 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1859 * @args: device IDENTIFY data / SCSI command of interest.
1860 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1861 * @buflen: Response buffer length.
1863 * Yields two logical unit device identification designators:
1864 * - vendor specific ASCII containing the ATA serial number
1865 * - SAT defined "t10 vendor id based" containing ASCII vendor
1866 * name ("ATA "), model and serial numbers.
1869 * spin_lock_irqsave(host lock)
1871 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
1872 unsigned int buflen)
1875 const int sat_model_serial_desc_len = 68;
1877 rbuf[1] = 0x83; /* this page code */
1880 if (buflen > (ATA_ID_SERNO_LEN + num + 3)) {
1881 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
1883 rbuf[num + 3] = ATA_ID_SERNO_LEN;
1885 ata_id_string(args->id, (unsigned char *) rbuf + num,
1886 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1887 num += ATA_ID_SERNO_LEN;
1889 if (buflen > (sat_model_serial_desc_len + num + 3)) {
1890 /* SAT defined lu model and serial numbers descriptor */
1891 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
1894 rbuf[num + 3] = sat_model_serial_desc_len;
1896 memcpy(rbuf + num, "ATA ", 8);
1898 ata_id_string(args->id, (unsigned char *) rbuf + num,
1899 ATA_ID_PROD, ATA_ID_PROD_LEN);
1900 num += ATA_ID_PROD_LEN;
1901 ata_id_string(args->id, (unsigned char *) rbuf + num,
1902 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1903 num += ATA_ID_SERNO_LEN;
1905 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
1910 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
1911 * @args: device IDENTIFY data / SCSI command of interest.
1912 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1913 * @buflen: Response buffer length.
1915 * Yields SAT-specified ATA VPD page.
1918 * spin_lock_irqsave(host lock)
1920 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf,
1921 unsigned int buflen)
1924 struct ata_taskfile tf;
1930 memset(&pbuf, 0, sizeof(pbuf));
1931 memset(&tf, 0, sizeof(tf));
1933 pbuf[1] = 0x89; /* our page code */
1934 pbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
1935 pbuf[3] = (0x238 & 0xff);
1937 memcpy(&pbuf[8], "linux ", 8);
1938 memcpy(&pbuf[16], "libata ", 16);
1939 memcpy(&pbuf[32], DRV_VERSION, 4);
1940 ata_id_string(args->id, &pbuf[32], ATA_ID_FW_REV, 4);
1942 /* we don't store the ATA device signature, so we fake it */
1944 tf.command = ATA_DRDY; /* really, this is Status reg */
1948 ata_tf_to_fis(&tf, 0, 1, &pbuf[36]); /* TODO: PMP? */
1949 pbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
1951 pbuf[56] = ATA_CMD_ID_ATA;
1953 i = min(buflen, 60U);
1954 memcpy(rbuf, &pbuf[0], i);
1960 memcpy(&rbuf[60], &args->id[0], min(buflen, 512U));
1965 * ata_scsiop_noop - Command handler that simply returns success.
1966 * @args: device IDENTIFY data / SCSI command of interest.
1967 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1968 * @buflen: Response buffer length.
1970 * No operation. Simply returns success to caller, to indicate
1971 * that the caller should successfully complete this SCSI command.
1974 * spin_lock_irqsave(host lock)
1976 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
1977 unsigned int buflen)
1984 * ata_msense_push - Push data onto MODE SENSE data output buffer
1985 * @ptr_io: (input/output) Location to store more output data
1986 * @last: End of output data buffer
1987 * @buf: Pointer to BLOB being added to output buffer
1988 * @buflen: Length of BLOB
1990 * Store MODE SENSE data on an output buffer.
1996 static void ata_msense_push(u8 **ptr_io, const u8 *last,
1997 const u8 *buf, unsigned int buflen)
2001 if ((ptr + buflen - 1) > last)
2004 memcpy(ptr, buf, buflen);
2012 * ata_msense_caching - Simulate MODE SENSE caching info page
2013 * @id: device IDENTIFY data
2014 * @ptr_io: (input/output) Location to store more output data
2015 * @last: End of output data buffer
2017 * Generate a caching info page, which conditionally indicates
2018 * write caching to the SCSI layer, depending on device
2025 static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io,
2028 u8 page[CACHE_MPAGE_LEN];
2030 memcpy(page, def_cache_mpage, sizeof(page));
2031 if (ata_id_wcache_enabled(id))
2032 page[2] |= (1 << 2); /* write cache enable */
2033 if (!ata_id_rahead_enabled(id))
2034 page[12] |= (1 << 5); /* disable read ahead */
2036 ata_msense_push(ptr_io, last, page, sizeof(page));
2037 return sizeof(page);
2041 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2042 * @dev: Device associated with this MODE SENSE command
2043 * @ptr_io: (input/output) Location to store more output data
2044 * @last: End of output data buffer
2046 * Generate a generic MODE SENSE control mode page.
2052 static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last)
2054 ata_msense_push(ptr_io, last, def_control_mpage,
2055 sizeof(def_control_mpage));
2056 return sizeof(def_control_mpage);
2060 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2061 * @dev: Device associated with this MODE SENSE command
2062 * @ptr_io: (input/output) Location to store more output data
2063 * @last: End of output data buffer
2065 * Generate a generic MODE SENSE r/w error recovery page.
2071 static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
2074 ata_msense_push(ptr_io, last, def_rw_recovery_mpage,
2075 sizeof(def_rw_recovery_mpage));
2076 return sizeof(def_rw_recovery_mpage);
2080 * We can turn this into a real blacklist if it's needed, for now just
2081 * blacklist any Maxtor BANC1G10 revision firmware
2083 static int ata_dev_supports_fua(u16 *id)
2085 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2089 if (!ata_id_has_fua(id))
2092 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2093 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2095 if (strcmp(model, "Maxtor"))
2097 if (strcmp(fw, "BANC1G10"))
2100 return 0; /* blacklisted */
2104 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2105 * @args: device IDENTIFY data / SCSI command of interest.
2106 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2107 * @buflen: Response buffer length.
2109 * Simulate MODE SENSE commands. Assume this is invoked for direct
2110 * access devices (e.g. disks) only. There should be no block
2111 * descriptor for other device types.
2114 * spin_lock_irqsave(host lock)
2117 unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
2118 unsigned int buflen)
2120 struct ata_device *dev = args->dev;
2121 u8 *scsicmd = args->cmd->cmnd, *p, *last;
2122 const u8 sat_blk_desc[] = {
2123 0, 0, 0, 0, /* number of blocks: sat unspecified */
2125 0, 0x2, 0x0 /* block length: 512 bytes */
2128 unsigned int ebd, page_control, six_byte, output_len, alloc_len, minlen;
2133 six_byte = (scsicmd[0] == MODE_SENSE);
2134 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2136 * LLBA bit in msense(10) ignored (compliant)
2139 page_control = scsicmd[2] >> 6;
2140 switch (page_control) {
2141 case 0: /* current */
2142 break; /* supported */
2144 goto saving_not_supp;
2145 case 1: /* changeable */
2146 case 2: /* defaults */
2152 output_len = 4 + (ebd ? 8 : 0);
2153 alloc_len = scsicmd[4];
2155 output_len = 8 + (ebd ? 8 : 0);
2156 alloc_len = (scsicmd[7] << 8) + scsicmd[8];
2158 minlen = (alloc_len < buflen) ? alloc_len : buflen;
2160 p = rbuf + output_len;
2161 last = rbuf + minlen - 1;
2163 pg = scsicmd[2] & 0x3f;
2166 * No mode subpages supported (yet) but asking for _all_
2167 * subpages may be valid
2169 if (spg && (spg != ALL_SUB_MPAGES))
2173 case RW_RECOVERY_MPAGE:
2174 output_len += ata_msense_rw_recovery(&p, last);
2178 output_len += ata_msense_caching(args->id, &p, last);
2181 case CONTROL_MPAGE: {
2182 output_len += ata_msense_ctl_mode(&p, last);
2187 output_len += ata_msense_rw_recovery(&p, last);
2188 output_len += ata_msense_caching(args->id, &p, last);
2189 output_len += ata_msense_ctl_mode(&p, last);
2192 default: /* invalid page code */
2200 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2201 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2206 rbuf[0] = output_len;
2211 rbuf[3] = sizeof(sat_blk_desc);
2213 memcpy(rbuf + 4, sat_blk_desc,
2214 sizeof(sat_blk_desc));
2218 rbuf[0] = output_len >> 8;
2220 rbuf[1] = output_len;
2225 rbuf[7] = sizeof(sat_blk_desc);
2227 memcpy(rbuf + 8, sat_blk_desc,
2228 sizeof(sat_blk_desc));
2234 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2235 /* "Invalid field in cbd" */
2239 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2240 /* "Saving parameters not supported" */
2245 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2246 * @args: device IDENTIFY data / SCSI command of interest.
2247 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2248 * @buflen: Response buffer length.
2250 * Simulate READ CAPACITY commands.
2255 unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
2256 unsigned int buflen)
2258 u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */
2262 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2263 if (last_lba >= 0xffffffffULL)
2264 last_lba = 0xffffffff;
2266 /* sector count, 32-bit */
2267 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 3));
2268 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 2));
2269 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 1));
2270 ATA_SCSI_RBUF_SET(3, last_lba);
2273 ATA_SCSI_RBUF_SET(6, ATA_SECT_SIZE >> 8);
2274 ATA_SCSI_RBUF_SET(7, ATA_SECT_SIZE & 0xff);
2276 /* sector count, 64-bit */
2277 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 7));
2278 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 6));
2279 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 5));
2280 ATA_SCSI_RBUF_SET(3, last_lba >> (8 * 4));
2281 ATA_SCSI_RBUF_SET(4, last_lba >> (8 * 3));
2282 ATA_SCSI_RBUF_SET(5, last_lba >> (8 * 2));
2283 ATA_SCSI_RBUF_SET(6, last_lba >> (8 * 1));
2284 ATA_SCSI_RBUF_SET(7, last_lba);
2287 ATA_SCSI_RBUF_SET(10, ATA_SECT_SIZE >> 8);
2288 ATA_SCSI_RBUF_SET(11, ATA_SECT_SIZE & 0xff);
2295 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2296 * @args: device IDENTIFY data / SCSI command of interest.
2297 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2298 * @buflen: Response buffer length.
2300 * Simulate REPORT LUNS command.
2303 * spin_lock_irqsave(host lock)
2306 unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
2307 unsigned int buflen)
2310 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2315 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2317 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2318 /* FIXME: not quite right; we don't want the
2319 * translation of taskfile registers into
2320 * a sense descriptors, since that's only
2321 * correct for ATA, not ATAPI
2323 ata_gen_passthru_sense(qc);
2326 qc->scsidone(qc->scsicmd);
2330 /* is it pointless to prefer PIO for "safety reasons"? */
2331 static inline int ata_pio_use_silly(struct ata_port *ap)
2333 return (ap->flags & ATA_FLAG_PIO_DMA);
2336 static void atapi_request_sense(struct ata_queued_cmd *qc)
2338 struct ata_port *ap = qc->ap;
2339 struct scsi_cmnd *cmd = qc->scsicmd;
2341 DPRINTK("ATAPI request sense\n");
2343 /* FIXME: is this needed? */
2344 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2346 #ifdef CONFIG_ATA_SFF
2347 if (ap->ops->sff_tf_read)
2348 ap->ops->sff_tf_read(ap, &qc->tf);
2351 /* fill these in, for the case where they are -not- overwritten */
2352 cmd->sense_buffer[0] = 0x70;
2353 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2357 /* setup sg table and init transfer direction */
2358 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2359 ata_sg_init(qc, &qc->sgent, 1);
2360 qc->dma_dir = DMA_FROM_DEVICE;
2362 memset(&qc->cdb, 0, qc->dev->cdb_len);
2363 qc->cdb[0] = REQUEST_SENSE;
2364 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2366 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2367 qc->tf.command = ATA_CMD_PACKET;
2369 if (ata_pio_use_silly(ap)) {
2370 qc->tf.protocol = ATAPI_PROT_DMA;
2371 qc->tf.feature |= ATAPI_PKT_DMA;
2373 qc->tf.protocol = ATAPI_PROT_PIO;
2374 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2377 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2379 qc->complete_fn = atapi_sense_complete;
2386 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2388 struct scsi_cmnd *cmd = qc->scsicmd;
2389 unsigned int err_mask = qc->err_mask;
2391 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2393 /* handle completion from new EH */
2394 if (unlikely(qc->ap->ops->error_handler &&
2395 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2397 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2398 /* FIXME: not quite right; we don't want the
2399 * translation of taskfile registers into a
2400 * sense descriptors, since that's only
2401 * correct for ATA, not ATAPI
2403 ata_gen_passthru_sense(qc);
2406 /* SCSI EH automatically locks door if sdev->locked is
2407 * set. Sometimes door lock request continues to
2408 * fail, for example, when no media is present. This
2409 * creates a loop - SCSI EH issues door lock which
2410 * fails and gets invoked again to acquire sense data
2411 * for the failed command.
2413 * If door lock fails, always clear sdev->locked to
2414 * avoid this infinite loop.
2416 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
2417 qc->dev->sdev->locked = 0;
2419 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2425 /* successful completion or old EH failure path */
2426 if (unlikely(err_mask & AC_ERR_DEV)) {
2427 cmd->result = SAM_STAT_CHECK_CONDITION;
2428 atapi_request_sense(qc);
2430 } else if (unlikely(err_mask)) {
2431 /* FIXME: not quite right; we don't want the
2432 * translation of taskfile registers into
2433 * a sense descriptors, since that's only
2434 * correct for ATA, not ATAPI
2436 ata_gen_passthru_sense(qc);
2438 u8 *scsicmd = cmd->cmnd;
2440 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2442 unsigned int buflen;
2443 unsigned long flags;
2445 local_irq_save(flags);
2447 buflen = ata_scsi_rbuf_get(cmd, &buf);
2449 /* ATAPI devices typically report zero for their SCSI version,
2450 * and sometimes deviate from the spec WRT response data
2451 * format. If SCSI version is reported as zero like normal,
2452 * then we make the following fixups: 1) Fake MMC-5 version,
2453 * to indicate to the Linux scsi midlayer this is a modern
2454 * device. 2) Ensure response data format / ATAPI information
2455 * are always correct.
2462 ata_scsi_rbuf_put(cmd, buf);
2464 local_irq_restore(flags);
2467 cmd->result = SAM_STAT_GOOD;
2474 * atapi_xlat - Initialize PACKET taskfile
2475 * @qc: command structure to be initialized
2478 * spin_lock_irqsave(host lock)
2481 * Zero on success, non-zero on failure.
2483 static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2485 struct scsi_cmnd *scmd = qc->scsicmd;
2486 struct ata_device *dev = qc->dev;
2487 int using_pio = (dev->flags & ATA_DFLAG_PIO);
2488 int nodata = (scmd->sc_data_direction == DMA_NONE);
2489 unsigned int nbytes;
2491 memset(qc->cdb, 0, dev->cdb_len);
2492 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2494 qc->complete_fn = atapi_qc_complete;
2496 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2497 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2498 qc->tf.flags |= ATA_TFLAG_WRITE;
2499 DPRINTK("direction: write\n");
2502 qc->tf.command = ATA_CMD_PACKET;
2503 ata_qc_set_pc_nbytes(qc);
2505 /* check whether ATAPI DMA is safe */
2506 if (!using_pio && ata_check_atapi_dma(qc))
2509 /* Some controller variants snoop this value for Packet
2510 * transfers to do state machine and FIFO management. Thus we
2511 * want to set it properly, and for DMA where it is
2512 * effectively meaningless.
2514 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2516 /* Most ATAPI devices which honor transfer chunk size don't
2517 * behave according to the spec when odd chunk size which
2518 * matches the transfer length is specified. If the number of
2519 * bytes to transfer is 2n+1. According to the spec, what
2520 * should happen is to indicate that 2n+1 is going to be
2521 * transferred and transfer 2n+2 bytes where the last byte is
2524 * In practice, this doesn't happen. ATAPI devices first
2525 * indicate and transfer 2n bytes and then indicate and
2526 * transfer 2 bytes where the last byte is padding.
2528 * This inconsistency confuses several controllers which
2529 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2530 * These controllers use actual number of transferred bytes to
2531 * update DMA poitner and transfer of 4n+2 bytes make those
2532 * controller push DMA pointer by 4n+4 bytes because SATA data
2533 * FISes are aligned to 4 bytes. This causes data corruption
2534 * and buffer overrun.
2536 * Always setting nbytes to even number solves this problem
2537 * because then ATAPI devices don't have to split data at 2n
2543 qc->tf.lbam = (nbytes & 0xFF);
2544 qc->tf.lbah = (nbytes >> 8);
2546 if (using_pio || nodata) {
2547 /* no data, or PIO data xfer */
2549 qc->tf.protocol = ATAPI_PROT_NODATA;
2551 qc->tf.protocol = ATAPI_PROT_PIO;
2554 qc->tf.protocol = ATAPI_PROT_DMA;
2555 qc->tf.feature |= ATAPI_PKT_DMA;
2557 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2558 (scmd->sc_data_direction != DMA_TO_DEVICE))
2559 /* some SATA bridges need us to indicate data xfer direction */
2560 qc->tf.feature |= ATAPI_DMADIR;
2564 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2565 as ATAPI tape drives don't get this right otherwise */
2569 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2571 if (!sata_pmp_attached(ap)) {
2572 if (likely(devno < ata_link_max_devices(&ap->link)))
2573 return &ap->link.device[devno];
2575 if (likely(devno < ap->nr_pmp_links))
2576 return &ap->pmp_link[devno].device[0];
2582 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2583 const struct scsi_device *scsidev)
2587 /* skip commands not addressed to targets we simulate */
2588 if (!sata_pmp_attached(ap)) {
2589 if (unlikely(scsidev->channel || scsidev->lun))
2591 devno = scsidev->id;
2593 if (unlikely(scsidev->id || scsidev->lun))
2595 devno = scsidev->channel;
2598 return ata_find_dev(ap, devno);
2602 * ata_scsi_dev_enabled - determine if device is enabled
2605 * Determine if commands should be sent to the specified device.
2608 * spin_lock_irqsave(host lock)
2611 * 0 if commands are not allowed / 1 if commands are allowed
2614 static int ata_scsi_dev_enabled(struct ata_device *dev)
2616 if (unlikely(!ata_dev_enabled(dev)))
2619 if (!atapi_enabled || (dev->link->ap->flags & ATA_FLAG_NO_ATAPI)) {
2620 if (unlikely(dev->class == ATA_DEV_ATAPI)) {
2621 ata_dev_printk(dev, KERN_WARNING,
2622 "WARNING: ATAPI is %s, device ignored.\n",
2623 atapi_enabled ? "not supported with this driver" : "disabled");
2632 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2633 * @ap: ATA port to which the device is attached
2634 * @scsidev: SCSI device from which we derive the ATA device
2636 * Given various information provided in struct scsi_cmnd,
2637 * map that onto an ATA bus, and using that mapping
2638 * determine which ata_device is associated with the
2639 * SCSI command to be sent.
2642 * spin_lock_irqsave(host lock)
2645 * Associated ATA device, or %NULL if not found.
2647 static struct ata_device *
2648 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2650 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2652 if (unlikely(!dev || !ata_scsi_dev_enabled(dev)))
2659 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2660 * @byte1: Byte 1 from pass-thru CDB.
2663 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2666 ata_scsi_map_proto(u8 byte1)
2668 switch((byte1 & 0x1e) >> 1) {
2669 case 3: /* Non-data */
2670 return ATA_PROT_NODATA;
2673 case 10: /* UDMA Data-in */
2674 case 11: /* UDMA Data-Out */
2675 return ATA_PROT_DMA;
2677 case 4: /* PIO Data-in */
2678 case 5: /* PIO Data-out */
2679 return ATA_PROT_PIO;
2681 case 0: /* Hard Reset */
2683 case 8: /* Device Diagnostic */
2684 case 9: /* Device Reset */
2685 case 7: /* DMA Queued */
2686 case 12: /* FPDMA */
2687 case 15: /* Return Response Info */
2688 default: /* Reserved */
2692 return ATA_PROT_UNKNOWN;
2696 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2697 * @qc: command structure to be initialized
2699 * Handles either 12 or 16-byte versions of the CDB.
2702 * Zero on success, non-zero on failure.
2704 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2706 struct ata_taskfile *tf = &(qc->tf);
2707 struct scsi_cmnd *scmd = qc->scsicmd;
2708 struct ata_device *dev = qc->dev;
2709 const u8 *cdb = scmd->cmnd;
2711 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2715 * Filter TPM commands by default. These provide an
2716 * essentially uncontrolled encrypted "back door" between
2717 * applications and the disk. Set libata.allow_tpm=1 if you
2718 * have a real reason for wanting to use them. This ensures
2719 * that installed software cannot easily mess stuff up without
2720 * user intent. DVR type users will probably ship with this enabled
2721 * for movie content management.
2723 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
2724 * for this and should do in future but that it is not sufficient as
2725 * DCS is an optional feature set. Thus we also do the software filter
2726 * so that we comply with the TC consortium stated goal that the user
2727 * can turn off TC features of their system.
2729 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
2732 /* We may not issue DMA commands if no DMA mode is set */
2733 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2737 * 12 and 16 byte CDBs use different offsets to
2738 * provide the various register values.
2740 if (cdb[0] == ATA_16) {
2742 * 16-byte CDB - may contain extended commands.
2744 * If that is the case, copy the upper byte register values.
2746 if (cdb[1] & 0x01) {
2747 tf->hob_feature = cdb[3];
2748 tf->hob_nsect = cdb[5];
2749 tf->hob_lbal = cdb[7];
2750 tf->hob_lbam = cdb[9];
2751 tf->hob_lbah = cdb[11];
2752 tf->flags |= ATA_TFLAG_LBA48;
2754 tf->flags &= ~ATA_TFLAG_LBA48;
2757 * Always copy low byte, device and command registers.
2759 tf->feature = cdb[4];
2764 tf->device = cdb[13];
2765 tf->command = cdb[14];
2768 * 12-byte CDB - incapable of extended commands.
2770 tf->flags &= ~ATA_TFLAG_LBA48;
2772 tf->feature = cdb[3];
2777 tf->device = cdb[8];
2778 tf->command = cdb[9];
2781 /* enforce correct master/slave bit */
2782 tf->device = dev->devno ?
2783 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2785 /* sanity check for pio multi commands */
2786 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
2789 if (is_multi_taskfile(tf)) {
2790 unsigned int multi_count = 1 << (cdb[1] >> 5);
2792 /* compare the passed through multi_count
2793 * with the cached multi_count of libata
2795 if (multi_count != dev->multi_count)
2796 ata_dev_printk(dev, KERN_WARNING,
2797 "invalid multi_count %u ignored\n",
2801 /* READ/WRITE LONG use a non-standard sect_size */
2802 qc->sect_size = ATA_SECT_SIZE;
2803 switch (tf->command) {
2804 case ATA_CMD_READ_LONG:
2805 case ATA_CMD_READ_LONG_ONCE:
2806 case ATA_CMD_WRITE_LONG:
2807 case ATA_CMD_WRITE_LONG_ONCE:
2808 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2810 qc->sect_size = scsi_bufflen(scmd);
2814 * Filter SET_FEATURES - XFER MODE command -- otherwise,
2815 * SET_FEATURES - XFER MODE must be preceded/succeeded
2816 * by an update to hardware-specific registers for each
2817 * controller (i.e. the reason for ->set_piomode(),
2818 * ->set_dmamode(), and ->post_set_mode() hooks).
2820 if ((tf->command == ATA_CMD_SET_FEATURES)
2821 && (tf->feature == SETFEATURES_XFER))
2825 * Set flags so that all registers will be written,
2826 * and pass on write indication (used for PIO/DMA
2829 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
2831 if (scmd->sc_data_direction == DMA_TO_DEVICE)
2832 tf->flags |= ATA_TFLAG_WRITE;
2835 * Set transfer length.
2837 * TODO: find out if we need to do more here to
2838 * cover scatter/gather case.
2840 ata_qc_set_pc_nbytes(qc);
2842 /* request result TF and be quiet about device error */
2843 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
2848 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
2849 /* "Invalid field in cdb" */
2854 * ata_get_xlat_func - check if SCSI to ATA translation is possible
2856 * @cmd: SCSI command opcode to consider
2858 * Look up the SCSI command given, and determine whether the
2859 * SCSI command is to be translated or simulated.
2862 * Pointer to translation function if possible, %NULL if not.
2865 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
2875 return ata_scsi_rw_xlat;
2877 case SYNCHRONIZE_CACHE:
2878 if (ata_try_flush_cache(dev))
2879 return ata_scsi_flush_xlat;
2884 return ata_scsi_verify_xlat;
2888 return ata_scsi_pass_thru;
2891 return ata_scsi_start_stop_xlat;
2898 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
2899 * @ap: ATA port to which the command was being sent
2900 * @cmd: SCSI command to dump
2902 * Prints the contents of a SCSI command via printk().
2905 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
2906 struct scsi_cmnd *cmd)
2909 struct scsi_device *scsidev = cmd->device;
2910 u8 *scsicmd = cmd->cmnd;
2912 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
2914 scsidev->channel, scsidev->id, scsidev->lun,
2915 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
2916 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
2921 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2922 void (*done)(struct scsi_cmnd *),
2923 struct ata_device *dev)
2925 u8 scsi_op = scmd->cmnd[0];
2926 ata_xlat_func_t xlat_func;
2929 if (dev->class == ATA_DEV_ATA) {
2930 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
2933 xlat_func = ata_get_xlat_func(dev, scsi_op);
2935 if (unlikely(!scmd->cmd_len))
2939 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
2940 /* relay SCSI command to ATAPI device */
2941 int len = COMMAND_SIZE(scsi_op);
2942 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
2945 xlat_func = atapi_xlat;
2947 /* ATA_16 passthru, treat as an ATA command */
2948 if (unlikely(scmd->cmd_len > 16))
2951 xlat_func = ata_get_xlat_func(dev, scsi_op);
2956 rc = ata_scsi_translate(dev, scmd, done, xlat_func);
2958 ata_scsi_simulate(dev, scmd, done);
2963 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
2964 scmd->cmd_len, scsi_op, dev->cdb_len);
2965 scmd->result = DID_ERROR << 16;
2971 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
2972 * @cmd: SCSI command to be sent
2973 * @done: Completion function, called when command is complete
2975 * In some cases, this function translates SCSI commands into
2976 * ATA taskfiles, and queues the taskfiles to be sent to
2977 * hardware. In other cases, this function simulates a
2978 * SCSI device by evaluating and responding to certain
2979 * SCSI commands. This creates the overall effect of
2980 * ATA and ATAPI devices appearing as SCSI devices.
2983 * Releases scsi-layer-held lock, and obtains host lock.
2986 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
2989 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
2991 struct ata_port *ap;
2992 struct ata_device *dev;
2993 struct scsi_device *scsidev = cmd->device;
2994 struct Scsi_Host *shost = scsidev->host;
2997 ap = ata_shost_to_port(shost);
2999 spin_unlock(shost->host_lock);
3000 spin_lock(ap->lock);
3002 ata_scsi_dump_cdb(ap, cmd);
3004 dev = ata_scsi_find_dev(ap, scsidev);
3006 rc = __ata_scsi_queuecmd(cmd, done, dev);
3008 cmd->result = (DID_BAD_TARGET << 16);
3012 spin_unlock(ap->lock);
3013 spin_lock(shost->host_lock);
3018 * ata_scsi_simulate - simulate SCSI command on ATA device
3019 * @dev: the target device
3020 * @cmd: SCSI command being sent to device.
3021 * @done: SCSI command completion function.
3023 * Interprets and directly executes a select list of SCSI commands
3024 * that can be handled internally.
3027 * spin_lock_irqsave(host lock)
3030 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
3031 void (*done)(struct scsi_cmnd *))
3033 struct ata_scsi_args args;
3034 const u8 *scsicmd = cmd->cmnd;
3042 switch(scsicmd[0]) {
3043 /* TODO: worth improving? */
3045 ata_scsi_invalid_field(cmd, done);
3049 if (scsicmd[1] & 2) /* is CmdDt set? */
3050 ata_scsi_invalid_field(cmd, done);
3051 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3052 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3053 else switch (scsicmd[2]) {
3055 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3058 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3061 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3064 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3067 ata_scsi_invalid_field(cmd, done);
3074 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3077 case MODE_SELECT: /* unconditionally return */
3078 case MODE_SELECT_10: /* bad-field-in-cdb */
3079 ata_scsi_invalid_field(cmd, done);
3083 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3086 case SERVICE_ACTION_IN:
3087 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3088 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3090 ata_scsi_invalid_field(cmd, done);
3094 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3098 ata_scsi_set_sense(cmd, 0, 0, 0);
3099 cmd->result = (DRIVER_SENSE << 24);
3103 /* if we reach this, then writeback caching is disabled,
3104 * turning this into a no-op.
3106 case SYNCHRONIZE_CACHE:
3109 /* no-op's, complete with success */
3113 case TEST_UNIT_READY:
3114 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3117 case SEND_DIAGNOSTIC:
3118 tmp8 = scsicmd[1] & ~(1 << 3);
3119 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3120 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3122 ata_scsi_invalid_field(cmd, done);
3125 /* all other commands */
3127 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3128 /* "Invalid command operation code" */
3134 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3138 for (i = 0; i < host->n_ports; i++) {
3139 struct ata_port *ap = host->ports[i];
3140 struct Scsi_Host *shost;
3143 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3147 *(struct ata_port **)&shost->hostdata[0] = ap;
3148 ap->scsi_host = shost;
3150 shost->transportt = &ata_scsi_transport_template;
3151 shost->unique_id = ap->print_id;
3154 shost->max_channel = 1;
3155 shost->max_cmd_len = 16;
3157 /* Schedule policy is determined by ->qc_defer()
3158 * callback and it needs to see every deferred qc.
3159 * Set host_blocked to 1 to prevent SCSI midlayer from
3160 * automatically deferring requests.
3162 shost->max_host_blocked = 1;
3164 rc = scsi_add_host(ap->scsi_host, ap->host->dev);
3172 scsi_host_put(host->ports[i]->scsi_host);
3175 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3177 scsi_remove_host(shost);
3178 scsi_host_put(shost);
3183 void ata_scsi_scan_host(struct ata_port *ap, int sync)
3186 struct ata_device *last_failed_dev = NULL;
3187 struct ata_link *link;
3188 struct ata_device *dev;
3190 if (ap->flags & ATA_FLAG_DISABLED)
3194 ata_port_for_each_link(link, ap) {
3195 ata_link_for_each_dev(dev, link) {
3196 struct scsi_device *sdev;
3197 int channel = 0, id = 0;
3199 if (!ata_dev_enabled(dev) || dev->sdev)
3202 if (ata_is_host_link(link))
3205 channel = link->pmp;
3207 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3209 if (!IS_ERR(sdev)) {
3211 scsi_device_put(sdev);
3216 /* If we scanned while EH was in progress or allocation
3217 * failure occurred, scan would have failed silently. Check
3218 * whether all devices are attached.
3220 ata_port_for_each_link(link, ap) {
3221 ata_link_for_each_dev(dev, link) {
3222 if (ata_dev_enabled(dev) && !dev->sdev)
3230 /* we're missing some SCSI devices */
3232 /* If caller requested synchrnous scan && we've made
3233 * any progress, sleep briefly and repeat.
3235 if (dev != last_failed_dev) {
3237 last_failed_dev = dev;
3241 /* We might be failing to detect boot device, give it
3242 * a few more chances.
3249 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan "
3250 "failed without making any progress,\n"
3251 " switching to async\n");
3254 queue_delayed_work(ata_aux_wq, &ap->hotplug_task,
3255 round_jiffies_relative(HZ));
3259 * ata_scsi_offline_dev - offline attached SCSI device
3260 * @dev: ATA device to offline attached SCSI device for
3262 * This function is called from ata_eh_hotplug() and responsible
3263 * for taking the SCSI device attached to @dev offline. This
3264 * function is called with host lock which protects dev->sdev
3268 * spin_lock_irqsave(host lock)
3271 * 1 if attached SCSI device exists, 0 otherwise.
3273 int ata_scsi_offline_dev(struct ata_device *dev)
3276 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3283 * ata_scsi_remove_dev - remove attached SCSI device
3284 * @dev: ATA device to remove attached SCSI device for
3286 * This function is called from ata_eh_scsi_hotplug() and
3287 * responsible for removing the SCSI device attached to @dev.
3290 * Kernel thread context (may sleep).
3292 static void ata_scsi_remove_dev(struct ata_device *dev)
3294 struct ata_port *ap = dev->link->ap;
3295 struct scsi_device *sdev;
3296 unsigned long flags;
3298 /* Alas, we need to grab scan_mutex to ensure SCSI device
3299 * state doesn't change underneath us and thus
3300 * scsi_device_get() always succeeds. The mutex locking can
3301 * be removed if there is __scsi_device_get() interface which
3302 * increments reference counts regardless of device state.
3304 mutex_lock(&ap->scsi_host->scan_mutex);
3305 spin_lock_irqsave(ap->lock, flags);
3307 /* clearing dev->sdev is protected by host lock */
3312 /* If user initiated unplug races with us, sdev can go
3313 * away underneath us after the host lock and
3314 * scan_mutex are released. Hold onto it.
3316 if (scsi_device_get(sdev) == 0) {
3317 /* The following ensures the attached sdev is
3318 * offline on return from ata_scsi_offline_dev()
3319 * regardless it wins or loses the race
3320 * against this function.
3322 scsi_device_set_state(sdev, SDEV_OFFLINE);
3329 spin_unlock_irqrestore(ap->lock, flags);
3330 mutex_unlock(&ap->scsi_host->scan_mutex);
3333 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
3334 sdev->sdev_gendev.bus_id);
3336 scsi_remove_device(sdev);
3337 scsi_device_put(sdev);
3341 static void ata_scsi_handle_link_detach(struct ata_link *link)
3343 struct ata_port *ap = link->ap;
3344 struct ata_device *dev;
3346 ata_link_for_each_dev(dev, link) {
3347 unsigned long flags;
3349 if (!(dev->flags & ATA_DFLAG_DETACHED))
3352 spin_lock_irqsave(ap->lock, flags);
3353 dev->flags &= ~ATA_DFLAG_DETACHED;
3354 spin_unlock_irqrestore(ap->lock, flags);
3356 ata_scsi_remove_dev(dev);
3361 * ata_scsi_media_change_notify - send media change event
3362 * @dev: Pointer to the disk device with media change event
3364 * Tell the block layer to send a media change notification
3368 * spin_lock_irqsave(host lock)
3370 void ata_scsi_media_change_notify(struct ata_device *dev)
3373 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3378 * ata_scsi_hotplug - SCSI part of hotplug
3379 * @work: Pointer to ATA port to perform SCSI hotplug on
3381 * Perform SCSI part of hotplug. It's executed from a separate
3382 * workqueue after EH completes. This is necessary because SCSI
3383 * hot plugging requires working EH and hot unplugging is
3384 * synchronized with hot plugging with a mutex.
3387 * Kernel thread context (may sleep).
3389 void ata_scsi_hotplug(struct work_struct *work)
3391 struct ata_port *ap =
3392 container_of(work, struct ata_port, hotplug_task.work);
3395 if (ap->pflags & ATA_PFLAG_UNLOADING) {
3396 DPRINTK("ENTER/EXIT - unloading\n");
3402 /* Unplug detached devices. We cannot use link iterator here
3403 * because PMP links have to be scanned even if PMP is
3404 * currently not attached. Iterate manually.
3406 ata_scsi_handle_link_detach(&ap->link);
3408 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3409 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3411 /* scan for new ones */
3412 ata_scsi_scan_host(ap, 0);
3418 * ata_scsi_user_scan - indication for user-initiated bus scan
3419 * @shost: SCSI host to scan
3420 * @channel: Channel to scan
3424 * This function is called when user explicitly requests bus
3425 * scan. Set probe pending flag and invoke EH.
3428 * SCSI layer (we don't care)
3433 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3434 unsigned int id, unsigned int lun)
3436 struct ata_port *ap = ata_shost_to_port(shost);
3437 unsigned long flags;
3440 if (!ap->ops->error_handler)
3443 if (lun != SCAN_WILD_CARD && lun)
3446 if (!sata_pmp_attached(ap)) {
3447 if (channel != SCAN_WILD_CARD && channel)
3451 if (id != SCAN_WILD_CARD && id)
3456 spin_lock_irqsave(ap->lock, flags);
3458 if (devno == SCAN_WILD_CARD) {
3459 struct ata_link *link;
3461 ata_port_for_each_link(link, ap) {
3462 struct ata_eh_info *ehi = &link->eh_info;
3463 ehi->probe_mask |= ATA_ALL_DEVICES;
3464 ehi->action |= ATA_EH_RESET;
3467 struct ata_device *dev = ata_find_dev(ap, devno);
3470 struct ata_eh_info *ehi = &dev->link->eh_info;
3471 ehi->probe_mask |= 1 << dev->devno;
3472 ehi->action |= ATA_EH_RESET;
3478 ata_port_schedule_eh(ap);
3479 spin_unlock_irqrestore(ap->lock, flags);
3480 ata_port_wait_eh(ap);
3482 spin_unlock_irqrestore(ap->lock, flags);
3488 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3489 * @work: Pointer to ATA port to perform scsi_rescan_device()
3491 * After ATA pass thru (SAT) commands are executed successfully,
3492 * libata need to propagate the changes to SCSI layer. This
3493 * function must be executed from ata_aux_wq such that sdev
3494 * attach/detach don't race with rescan.
3497 * Kernel thread context (may sleep).
3499 void ata_scsi_dev_rescan(struct work_struct *work)
3501 struct ata_port *ap =
3502 container_of(work, struct ata_port, scsi_rescan_task);
3503 struct ata_link *link;
3504 struct ata_device *dev;
3505 unsigned long flags;
3507 spin_lock_irqsave(ap->lock, flags);
3509 ata_port_for_each_link(link, ap) {
3510 ata_link_for_each_dev(dev, link) {
3511 struct scsi_device *sdev = dev->sdev;
3513 if (!ata_dev_enabled(dev) || !sdev)
3515 if (scsi_device_get(sdev))
3518 spin_unlock_irqrestore(ap->lock, flags);
3519 scsi_rescan_device(&(sdev->sdev_gendev));
3520 scsi_device_put(sdev);
3521 spin_lock_irqsave(ap->lock, flags);
3525 spin_unlock_irqrestore(ap->lock, flags);
3529 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3530 * @host: ATA host container for all SAS ports
3531 * @port_info: Information from low-level host driver
3532 * @shost: SCSI host that the scsi device is attached to
3535 * PCI/etc. bus probe sem.
3538 * ata_port pointer on success / NULL on failure.
3541 struct ata_port *ata_sas_port_alloc(struct ata_host *host,
3542 struct ata_port_info *port_info,
3543 struct Scsi_Host *shost)
3545 struct ata_port *ap;
3547 ap = ata_port_alloc(host);
3552 ap->lock = shost->host_lock;
3553 ap->pio_mask = port_info->pio_mask;
3554 ap->mwdma_mask = port_info->mwdma_mask;
3555 ap->udma_mask = port_info->udma_mask;
3556 ap->flags |= port_info->flags;
3557 ap->ops = port_info->port_ops;
3558 ap->cbl = ATA_CBL_SATA;
3562 EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3565 * ata_sas_port_start - Set port up for dma.
3566 * @ap: Port to initialize
3568 * Called just after data structures for each port are
3571 * May be used as the port_start() entry in ata_port_operations.
3574 * Inherited from caller.
3576 int ata_sas_port_start(struct ata_port *ap)
3580 EXPORT_SYMBOL_GPL(ata_sas_port_start);
3583 * ata_port_stop - Undo ata_sas_port_start()
3584 * @ap: Port to shut down
3586 * May be used as the port_stop() entry in ata_port_operations.
3589 * Inherited from caller.
3592 void ata_sas_port_stop(struct ata_port *ap)
3595 EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3598 * ata_sas_port_init - Initialize a SATA device
3599 * @ap: SATA port to initialize
3602 * PCI/etc. bus probe sem.
3605 * Zero on success, non-zero on error.
3608 int ata_sas_port_init(struct ata_port *ap)
3610 int rc = ap->ops->port_start(ap);
3613 ap->print_id = ata_print_id++;
3614 rc = ata_bus_probe(ap);
3619 EXPORT_SYMBOL_GPL(ata_sas_port_init);
3622 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3623 * @ap: SATA port to destroy
3627 void ata_sas_port_destroy(struct ata_port *ap)
3629 if (ap->ops->port_stop)
3630 ap->ops->port_stop(ap);
3633 EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3636 * ata_sas_slave_configure - Default slave_config routine for libata devices
3637 * @sdev: SCSI device to configure
3638 * @ap: ATA port to which SCSI device is attached
3644 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
3646 ata_scsi_sdev_config(sdev);
3647 ata_scsi_dev_config(sdev, ap->link.device);
3650 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3653 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3654 * @cmd: SCSI command to be sent
3655 * @done: Completion function, called when command is complete
3656 * @ap: ATA port to which the command is being sent
3659 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3663 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
3664 struct ata_port *ap)
3668 ata_scsi_dump_cdb(ap, cmd);
3670 if (likely(ata_scsi_dev_enabled(ap->link.device)))
3671 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device);
3673 cmd->result = (DID_BAD_TARGET << 16);
3678 EXPORT_SYMBOL_GPL(ata_sas_queuecmd);