xref: /linux/drivers/ata/libata-scsi.c (revision db6d8d5fdf9537641c76ba7f32e02b4bcc600972)
1 /*
2  *  libata-scsi.c - helper library for ATA
3  *
4  *  Maintained by:  Tejun Heo <tj@kernel.org>
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/slab.h>
37 #include <linux/kernel.h>
38 #include <linux/blkdev.h>
39 #include <linux/spinlock.h>
40 #include <linux/export.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_eh.h>
45 #include <scsi/scsi_device.h>
46 #include <scsi/scsi_tcq.h>
47 #include <scsi/scsi_transport.h>
48 #include <linux/libata.h>
49 #include <linux/hdreg.h>
50 #include <linux/uaccess.h>
51 #include <linux/suspend.h>
52 #include <asm/unaligned.h>
53 
54 #include "libata.h"
55 #include "libata-transport.h"
56 
57 #define ATA_SCSI_RBUF_SIZE	4096
58 
59 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
60 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
61 
62 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
63 
64 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
65 					const struct scsi_device *scsidev);
66 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
67 					    const struct scsi_device *scsidev);
68 
69 #define RW_RECOVERY_MPAGE 0x1
70 #define RW_RECOVERY_MPAGE_LEN 12
71 #define CACHE_MPAGE 0x8
72 #define CACHE_MPAGE_LEN 20
73 #define CONTROL_MPAGE 0xa
74 #define CONTROL_MPAGE_LEN 12
75 #define ALL_MPAGES 0x3f
76 #define ALL_SUB_MPAGES 0xff
77 
78 
79 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
80 	RW_RECOVERY_MPAGE,
81 	RW_RECOVERY_MPAGE_LEN - 2,
82 	(1 << 7),	/* AWRE */
83 	0,		/* read retry count */
84 	0, 0, 0, 0,
85 	0,		/* write retry count */
86 	0, 0, 0
87 };
88 
89 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
90 	CACHE_MPAGE,
91 	CACHE_MPAGE_LEN - 2,
92 	0,		/* contains WCE, needs to be 0 for logic */
93 	0, 0, 0, 0, 0, 0, 0, 0, 0,
94 	0,		/* contains DRA, needs to be 0 for logic */
95 	0, 0, 0, 0, 0, 0, 0
96 };
97 
98 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
99 	CONTROL_MPAGE,
100 	CONTROL_MPAGE_LEN - 2,
101 	2,	/* DSENSE=0, GLTSD=1 */
102 	0,	/* [QAM+QERR may be 1, see 05-359r1] */
103 	0, 0, 0, 0, 0xff, 0xff,
104 	0, 30	/* extended self test time, see 05-359r1 */
105 };
106 
107 static const char *ata_lpm_policy_names[] = {
108 	[ATA_LPM_UNKNOWN]	= "max_performance",
109 	[ATA_LPM_MAX_POWER]	= "max_performance",
110 	[ATA_LPM_MED_POWER]	= "medium_power",
111 	[ATA_LPM_MIN_POWER]	= "min_power",
112 };
113 
114 static ssize_t ata_scsi_lpm_store(struct device *device,
115 				  struct device_attribute *attr,
116 				  const char *buf, size_t count)
117 {
118 	struct Scsi_Host *shost = class_to_shost(device);
119 	struct ata_port *ap = ata_shost_to_port(shost);
120 	struct ata_link *link;
121 	struct ata_device *dev;
122 	enum ata_lpm_policy policy;
123 	unsigned long flags;
124 
125 	/* UNKNOWN is internal state, iterate from MAX_POWER */
126 	for (policy = ATA_LPM_MAX_POWER;
127 	     policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
128 		const char *name = ata_lpm_policy_names[policy];
129 
130 		if (strncmp(name, buf, strlen(name)) == 0)
131 			break;
132 	}
133 	if (policy == ARRAY_SIZE(ata_lpm_policy_names))
134 		return -EINVAL;
135 
136 	spin_lock_irqsave(ap->lock, flags);
137 
138 	ata_for_each_link(link, ap, EDGE) {
139 		ata_for_each_dev(dev, &ap->link, ENABLED) {
140 			if (dev->horkage & ATA_HORKAGE_NOLPM) {
141 				count = -EOPNOTSUPP;
142 				goto out_unlock;
143 			}
144 		}
145 	}
146 
147 	ap->target_lpm_policy = policy;
148 	ata_port_schedule_eh(ap);
149 out_unlock:
150 	spin_unlock_irqrestore(ap->lock, flags);
151 	return count;
152 }
153 
154 static ssize_t ata_scsi_lpm_show(struct device *dev,
155 				 struct device_attribute *attr, char *buf)
156 {
157 	struct Scsi_Host *shost = class_to_shost(dev);
158 	struct ata_port *ap = ata_shost_to_port(shost);
159 
160 	if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
161 		return -EINVAL;
162 
163 	return snprintf(buf, PAGE_SIZE, "%s\n",
164 			ata_lpm_policy_names[ap->target_lpm_policy]);
165 }
166 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
167 	    ata_scsi_lpm_show, ata_scsi_lpm_store);
168 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
169 
170 static ssize_t ata_scsi_park_show(struct device *device,
171 				  struct device_attribute *attr, char *buf)
172 {
173 	struct scsi_device *sdev = to_scsi_device(device);
174 	struct ata_port *ap;
175 	struct ata_link *link;
176 	struct ata_device *dev;
177 	unsigned long now;
178 	unsigned int uninitialized_var(msecs);
179 	int rc = 0;
180 
181 	ap = ata_shost_to_port(sdev->host);
182 
183 	spin_lock_irq(ap->lock);
184 	dev = ata_scsi_find_dev(ap, sdev);
185 	if (!dev) {
186 		rc = -ENODEV;
187 		goto unlock;
188 	}
189 	if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
190 		rc = -EOPNOTSUPP;
191 		goto unlock;
192 	}
193 
194 	link = dev->link;
195 	now = jiffies;
196 	if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
197 	    link->eh_context.unloaded_mask & (1 << dev->devno) &&
198 	    time_after(dev->unpark_deadline, now))
199 		msecs = jiffies_to_msecs(dev->unpark_deadline - now);
200 	else
201 		msecs = 0;
202 
203 unlock:
204 	spin_unlock_irq(ap->lock);
205 
206 	return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
207 }
208 
209 static ssize_t ata_scsi_park_store(struct device *device,
210 				   struct device_attribute *attr,
211 				   const char *buf, size_t len)
212 {
213 	struct scsi_device *sdev = to_scsi_device(device);
214 	struct ata_port *ap;
215 	struct ata_device *dev;
216 	long int input;
217 	unsigned long flags;
218 	int rc;
219 
220 	rc = kstrtol(buf, 10, &input);
221 	if (rc)
222 		return rc;
223 	if (input < -2)
224 		return -EINVAL;
225 	if (input > ATA_TMOUT_MAX_PARK) {
226 		rc = -EOVERFLOW;
227 		input = ATA_TMOUT_MAX_PARK;
228 	}
229 
230 	ap = ata_shost_to_port(sdev->host);
231 
232 	spin_lock_irqsave(ap->lock, flags);
233 	dev = ata_scsi_find_dev(ap, sdev);
234 	if (unlikely(!dev)) {
235 		rc = -ENODEV;
236 		goto unlock;
237 	}
238 	if (dev->class != ATA_DEV_ATA &&
239 	    dev->class != ATA_DEV_ZAC) {
240 		rc = -EOPNOTSUPP;
241 		goto unlock;
242 	}
243 
244 	if (input >= 0) {
245 		if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
246 			rc = -EOPNOTSUPP;
247 			goto unlock;
248 		}
249 
250 		dev->unpark_deadline = ata_deadline(jiffies, input);
251 		dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
252 		ata_port_schedule_eh(ap);
253 		complete(&ap->park_req_pending);
254 	} else {
255 		switch (input) {
256 		case -1:
257 			dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
258 			break;
259 		case -2:
260 			dev->flags |= ATA_DFLAG_NO_UNLOAD;
261 			break;
262 		}
263 	}
264 unlock:
265 	spin_unlock_irqrestore(ap->lock, flags);
266 
267 	return rc ? rc : len;
268 }
269 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
270 	    ata_scsi_park_show, ata_scsi_park_store);
271 EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
272 
273 void ata_scsi_set_sense(struct ata_device *dev, struct scsi_cmnd *cmd,
274 			u8 sk, u8 asc, u8 ascq)
275 {
276 	bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE);
277 
278 	if (!cmd)
279 		return;
280 
281 	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
282 
283 	scsi_build_sense_buffer(d_sense, cmd->sense_buffer, sk, asc, ascq);
284 }
285 
286 void ata_scsi_set_sense_information(struct ata_device *dev,
287 				    struct scsi_cmnd *cmd,
288 				    const struct ata_taskfile *tf)
289 {
290 	u64 information;
291 
292 	if (!cmd)
293 		return;
294 
295 	information = ata_tf_read_block(tf, dev);
296 	if (information == U64_MAX)
297 		return;
298 
299 	scsi_set_sense_information(cmd->sense_buffer,
300 				   SCSI_SENSE_BUFFERSIZE, information);
301 }
302 
303 static void ata_scsi_set_invalid_field(struct ata_device *dev,
304 				       struct scsi_cmnd *cmd, u16 field, u8 bit)
305 {
306 	ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x24, 0x0);
307 	/* "Invalid field in CDB" */
308 	scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE,
309 				     field, bit, 1);
310 }
311 
312 static void ata_scsi_set_invalid_parameter(struct ata_device *dev,
313 					   struct scsi_cmnd *cmd, u16 field)
314 {
315 	/* "Invalid field in parameter list" */
316 	ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x26, 0x0);
317 	scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE,
318 				     field, 0xff, 0);
319 }
320 
321 static ssize_t
322 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
323 			  const char *buf, size_t count)
324 {
325 	struct Scsi_Host *shost = class_to_shost(dev);
326 	struct ata_port *ap = ata_shost_to_port(shost);
327 	if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
328 		return ap->ops->em_store(ap, buf, count);
329 	return -EINVAL;
330 }
331 
332 static ssize_t
333 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
334 			 char *buf)
335 {
336 	struct Scsi_Host *shost = class_to_shost(dev);
337 	struct ata_port *ap = ata_shost_to_port(shost);
338 
339 	if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
340 		return ap->ops->em_show(ap, buf);
341 	return -EINVAL;
342 }
343 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
344 		ata_scsi_em_message_show, ata_scsi_em_message_store);
345 EXPORT_SYMBOL_GPL(dev_attr_em_message);
346 
347 static ssize_t
348 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
349 			      char *buf)
350 {
351 	struct Scsi_Host *shost = class_to_shost(dev);
352 	struct ata_port *ap = ata_shost_to_port(shost);
353 
354 	return snprintf(buf, 23, "%d\n", ap->em_message_type);
355 }
356 DEVICE_ATTR(em_message_type, S_IRUGO,
357 		  ata_scsi_em_message_type_show, NULL);
358 EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
359 
360 static ssize_t
361 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
362 		char *buf)
363 {
364 	struct scsi_device *sdev = to_scsi_device(dev);
365 	struct ata_port *ap = ata_shost_to_port(sdev->host);
366 	struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
367 
368 	if (atadev && ap->ops->sw_activity_show &&
369 	    (ap->flags & ATA_FLAG_SW_ACTIVITY))
370 		return ap->ops->sw_activity_show(atadev, buf);
371 	return -EINVAL;
372 }
373 
374 static ssize_t
375 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
376 	const char *buf, size_t count)
377 {
378 	struct scsi_device *sdev = to_scsi_device(dev);
379 	struct ata_port *ap = ata_shost_to_port(sdev->host);
380 	struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
381 	enum sw_activity val;
382 	int rc;
383 
384 	if (atadev && ap->ops->sw_activity_store &&
385 	    (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
386 		val = simple_strtoul(buf, NULL, 0);
387 		switch (val) {
388 		case OFF: case BLINK_ON: case BLINK_OFF:
389 			rc = ap->ops->sw_activity_store(atadev, val);
390 			if (!rc)
391 				return count;
392 			else
393 				return rc;
394 		}
395 	}
396 	return -EINVAL;
397 }
398 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
399 			ata_scsi_activity_store);
400 EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
401 
402 struct device_attribute *ata_common_sdev_attrs[] = {
403 	&dev_attr_unload_heads,
404 	NULL
405 };
406 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
407 
408 static void ata_scsi_invalid_field(struct ata_device *dev,
409 				   struct scsi_cmnd *cmd, u16 field)
410 {
411 	ata_scsi_set_invalid_field(dev, cmd, field, 0xff);
412 	cmd->scsi_done(cmd);
413 }
414 
415 /**
416  *	ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
417  *	@sdev: SCSI device for which BIOS geometry is to be determined
418  *	@bdev: block device associated with @sdev
419  *	@capacity: capacity of SCSI device
420  *	@geom: location to which geometry will be output
421  *
422  *	Generic bios head/sector/cylinder calculator
423  *	used by sd. Most BIOSes nowadays expect a XXX/255/16  (CHS)
424  *	mapping. Some situations may arise where the disk is not
425  *	bootable if this is not used.
426  *
427  *	LOCKING:
428  *	Defined by the SCSI layer.  We don't really care.
429  *
430  *	RETURNS:
431  *	Zero.
432  */
433 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
434 		       sector_t capacity, int geom[])
435 {
436 	geom[0] = 255;
437 	geom[1] = 63;
438 	sector_div(capacity, 255*63);
439 	geom[2] = capacity;
440 
441 	return 0;
442 }
443 
444 /**
445  *	ata_scsi_unlock_native_capacity - unlock native capacity
446  *	@sdev: SCSI device to adjust device capacity for
447  *
448  *	This function is called if a partition on @sdev extends beyond
449  *	the end of the device.  It requests EH to unlock HPA.
450  *
451  *	LOCKING:
452  *	Defined by the SCSI layer.  Might sleep.
453  */
454 void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
455 {
456 	struct ata_port *ap = ata_shost_to_port(sdev->host);
457 	struct ata_device *dev;
458 	unsigned long flags;
459 
460 	spin_lock_irqsave(ap->lock, flags);
461 
462 	dev = ata_scsi_find_dev(ap, sdev);
463 	if (dev && dev->n_sectors < dev->n_native_sectors) {
464 		dev->flags |= ATA_DFLAG_UNLOCK_HPA;
465 		dev->link->eh_info.action |= ATA_EH_RESET;
466 		ata_port_schedule_eh(ap);
467 	}
468 
469 	spin_unlock_irqrestore(ap->lock, flags);
470 	ata_port_wait_eh(ap);
471 }
472 
473 /**
474  *	ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
475  *	@ap: target port
476  *	@sdev: SCSI device to get identify data for
477  *	@arg: User buffer area for identify data
478  *
479  *	LOCKING:
480  *	Defined by the SCSI layer.  We don't really care.
481  *
482  *	RETURNS:
483  *	Zero on success, negative errno on error.
484  */
485 static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
486 			    void __user *arg)
487 {
488 	struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
489 	u16 __user *dst = arg;
490 	char buf[40];
491 
492 	if (!dev)
493 		return -ENOMSG;
494 
495 	if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
496 		return -EFAULT;
497 
498 	ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
499 	if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
500 		return -EFAULT;
501 
502 	ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
503 	if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
504 		return -EFAULT;
505 
506 	ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
507 	if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
508 		return -EFAULT;
509 
510 	return 0;
511 }
512 
513 /**
514  *	ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
515  *	@scsidev: Device to which we are issuing command
516  *	@arg: User provided data for issuing command
517  *
518  *	LOCKING:
519  *	Defined by the SCSI layer.  We don't really care.
520  *
521  *	RETURNS:
522  *	Zero on success, negative errno on error.
523  */
524 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
525 {
526 	int rc = 0;
527 	u8 scsi_cmd[MAX_COMMAND_SIZE];
528 	u8 args[4], *argbuf = NULL, *sensebuf = NULL;
529 	int argsize = 0;
530 	enum dma_data_direction data_dir;
531 	int cmd_result;
532 
533 	if (arg == NULL)
534 		return -EINVAL;
535 
536 	if (copy_from_user(args, arg, sizeof(args)))
537 		return -EFAULT;
538 
539 	sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
540 	if (!sensebuf)
541 		return -ENOMEM;
542 
543 	memset(scsi_cmd, 0, sizeof(scsi_cmd));
544 
545 	if (args[3]) {
546 		argsize = ATA_SECT_SIZE * args[3];
547 		argbuf = kmalloc(argsize, GFP_KERNEL);
548 		if (argbuf == NULL) {
549 			rc = -ENOMEM;
550 			goto error;
551 		}
552 
553 		scsi_cmd[1]  = (4 << 1); /* PIO Data-in */
554 		scsi_cmd[2]  = 0x0e;     /* no off.line or cc, read from dev,
555 					    block count in sector count field */
556 		data_dir = DMA_FROM_DEVICE;
557 	} else {
558 		scsi_cmd[1]  = (3 << 1); /* Non-data */
559 		scsi_cmd[2]  = 0x20;     /* cc but no off.line or data xfer */
560 		data_dir = DMA_NONE;
561 	}
562 
563 	scsi_cmd[0] = ATA_16;
564 
565 	scsi_cmd[4] = args[2];
566 	if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
567 		scsi_cmd[6]  = args[3];
568 		scsi_cmd[8]  = args[1];
569 		scsi_cmd[10] = 0x4f;
570 		scsi_cmd[12] = 0xc2;
571 	} else {
572 		scsi_cmd[6]  = args[1];
573 	}
574 	scsi_cmd[14] = args[0];
575 
576 	/* Good values for timeout and retries?  Values below
577 	   from scsi_ioctl_send_command() for default case... */
578 	cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
579 				  sensebuf, (10*HZ), 5, 0, NULL);
580 
581 	if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
582 		u8 *desc = sensebuf + 8;
583 		cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
584 
585 		/* If we set cc then ATA pass-through will cause a
586 		 * check condition even if no error. Filter that. */
587 		if (cmd_result & SAM_STAT_CHECK_CONDITION) {
588 			struct scsi_sense_hdr sshdr;
589 			scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
590 					     &sshdr);
591 			if (sshdr.sense_key == RECOVERED_ERROR &&
592 			    sshdr.asc == 0 && sshdr.ascq == 0x1d)
593 				cmd_result &= ~SAM_STAT_CHECK_CONDITION;
594 		}
595 
596 		/* Send userspace a few ATA registers (same as drivers/ide) */
597 		if (sensebuf[0] == 0x72 &&	/* format is "descriptor" */
598 		    desc[0] == 0x09) {		/* code is "ATA Descriptor" */
599 			args[0] = desc[13];	/* status */
600 			args[1] = desc[3];	/* error */
601 			args[2] = desc[5];	/* sector count (0:7) */
602 			if (copy_to_user(arg, args, sizeof(args)))
603 				rc = -EFAULT;
604 		}
605 	}
606 
607 
608 	if (cmd_result) {
609 		rc = -EIO;
610 		goto error;
611 	}
612 
613 	if ((argbuf)
614 	 && copy_to_user(arg + sizeof(args), argbuf, argsize))
615 		rc = -EFAULT;
616 error:
617 	kfree(sensebuf);
618 	kfree(argbuf);
619 	return rc;
620 }
621 
622 /**
623  *	ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
624  *	@scsidev: Device to which we are issuing command
625  *	@arg: User provided data for issuing command
626  *
627  *	LOCKING:
628  *	Defined by the SCSI layer.  We don't really care.
629  *
630  *	RETURNS:
631  *	Zero on success, negative errno on error.
632  */
633 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
634 {
635 	int rc = 0;
636 	u8 scsi_cmd[MAX_COMMAND_SIZE];
637 	u8 args[7], *sensebuf = NULL;
638 	int cmd_result;
639 
640 	if (arg == NULL)
641 		return -EINVAL;
642 
643 	if (copy_from_user(args, arg, sizeof(args)))
644 		return -EFAULT;
645 
646 	sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
647 	if (!sensebuf)
648 		return -ENOMEM;
649 
650 	memset(scsi_cmd, 0, sizeof(scsi_cmd));
651 	scsi_cmd[0]  = ATA_16;
652 	scsi_cmd[1]  = (3 << 1); /* Non-data */
653 	scsi_cmd[2]  = 0x20;     /* cc but no off.line or data xfer */
654 	scsi_cmd[4]  = args[1];
655 	scsi_cmd[6]  = args[2];
656 	scsi_cmd[8]  = args[3];
657 	scsi_cmd[10] = args[4];
658 	scsi_cmd[12] = args[5];
659 	scsi_cmd[13] = args[6] & 0x4f;
660 	scsi_cmd[14] = args[0];
661 
662 	/* Good values for timeout and retries?  Values below
663 	   from scsi_ioctl_send_command() for default case... */
664 	cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
665 				sensebuf, (10*HZ), 5, 0, NULL);
666 
667 	if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
668 		u8 *desc = sensebuf + 8;
669 		cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
670 
671 		/* If we set cc then ATA pass-through will cause a
672 		 * check condition even if no error. Filter that. */
673 		if (cmd_result & SAM_STAT_CHECK_CONDITION) {
674 			struct scsi_sense_hdr sshdr;
675 			scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
676 						&sshdr);
677 			if (sshdr.sense_key == RECOVERED_ERROR &&
678 			    sshdr.asc == 0 && sshdr.ascq == 0x1d)
679 				cmd_result &= ~SAM_STAT_CHECK_CONDITION;
680 		}
681 
682 		/* Send userspace ATA registers */
683 		if (sensebuf[0] == 0x72 &&	/* format is "descriptor" */
684 				desc[0] == 0x09) {/* code is "ATA Descriptor" */
685 			args[0] = desc[13];	/* status */
686 			args[1] = desc[3];	/* error */
687 			args[2] = desc[5];	/* sector count (0:7) */
688 			args[3] = desc[7];	/* lbal */
689 			args[4] = desc[9];	/* lbam */
690 			args[5] = desc[11];	/* lbah */
691 			args[6] = desc[12];	/* select */
692 			if (copy_to_user(arg, args, sizeof(args)))
693 				rc = -EFAULT;
694 		}
695 	}
696 
697 	if (cmd_result) {
698 		rc = -EIO;
699 		goto error;
700 	}
701 
702  error:
703 	kfree(sensebuf);
704 	return rc;
705 }
706 
707 static int ata_ioc32(struct ata_port *ap)
708 {
709 	if (ap->flags & ATA_FLAG_PIO_DMA)
710 		return 1;
711 	if (ap->pflags & ATA_PFLAG_PIO32)
712 		return 1;
713 	return 0;
714 }
715 
716 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
717 		     int cmd, void __user *arg)
718 {
719 	unsigned long val;
720 	int rc = -EINVAL;
721 	unsigned long flags;
722 
723 	switch (cmd) {
724 	case HDIO_GET_32BIT:
725 		spin_lock_irqsave(ap->lock, flags);
726 		val = ata_ioc32(ap);
727 		spin_unlock_irqrestore(ap->lock, flags);
728 		return put_user(val, (unsigned long __user *)arg);
729 
730 	case HDIO_SET_32BIT:
731 		val = (unsigned long) arg;
732 		rc = 0;
733 		spin_lock_irqsave(ap->lock, flags);
734 		if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
735 			if (val)
736 				ap->pflags |= ATA_PFLAG_PIO32;
737 			else
738 				ap->pflags &= ~ATA_PFLAG_PIO32;
739 		} else {
740 			if (val != ata_ioc32(ap))
741 				rc = -EINVAL;
742 		}
743 		spin_unlock_irqrestore(ap->lock, flags);
744 		return rc;
745 
746 	case HDIO_GET_IDENTITY:
747 		return ata_get_identity(ap, scsidev, arg);
748 
749 	case HDIO_DRIVE_CMD:
750 		if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
751 			return -EACCES;
752 		return ata_cmd_ioctl(scsidev, arg);
753 
754 	case HDIO_DRIVE_TASK:
755 		if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
756 			return -EACCES;
757 		return ata_task_ioctl(scsidev, arg);
758 
759 	default:
760 		rc = -ENOTTY;
761 		break;
762 	}
763 
764 	return rc;
765 }
766 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
767 
768 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
769 {
770 	return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
771 				scsidev, cmd, arg);
772 }
773 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
774 
775 /**
776  *	ata_scsi_qc_new - acquire new ata_queued_cmd reference
777  *	@dev: ATA device to which the new command is attached
778  *	@cmd: SCSI command that originated this ATA command
779  *
780  *	Obtain a reference to an unused ata_queued_cmd structure,
781  *	which is the basic libata structure representing a single
782  *	ATA command sent to the hardware.
783  *
784  *	If a command was available, fill in the SCSI-specific
785  *	portions of the structure with information on the
786  *	current command.
787  *
788  *	LOCKING:
789  *	spin_lock_irqsave(host lock)
790  *
791  *	RETURNS:
792  *	Command allocated, or %NULL if none available.
793  */
794 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
795 					      struct scsi_cmnd *cmd)
796 {
797 	struct ata_queued_cmd *qc;
798 
799 	qc = ata_qc_new_init(dev, cmd->request->tag);
800 	if (qc) {
801 		qc->scsicmd = cmd;
802 		qc->scsidone = cmd->scsi_done;
803 
804 		qc->sg = scsi_sglist(cmd);
805 		qc->n_elem = scsi_sg_count(cmd);
806 	} else {
807 		cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
808 		cmd->scsi_done(cmd);
809 	}
810 
811 	return qc;
812 }
813 
814 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
815 {
816 	struct scsi_cmnd *scmd = qc->scsicmd;
817 
818 	qc->extrabytes = scmd->request->extra_len;
819 	qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
820 }
821 
822 /**
823  *	ata_dump_status - user friendly display of error info
824  *	@id: id of the port in question
825  *	@tf: ptr to filled out taskfile
826  *
827  *	Decode and dump the ATA error/status registers for the user so
828  *	that they have some idea what really happened at the non
829  *	make-believe layer.
830  *
831  *	LOCKING:
832  *	inherited from caller
833  */
834 static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
835 {
836 	u8 stat = tf->command, err = tf->feature;
837 
838 	printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
839 	if (stat & ATA_BUSY) {
840 		printk("Busy }\n");	/* Data is not valid in this case */
841 	} else {
842 		if (stat & ATA_DRDY)	printk("DriveReady ");
843 		if (stat & ATA_DF)	printk("DeviceFault ");
844 		if (stat & ATA_DSC)	printk("SeekComplete ");
845 		if (stat & ATA_DRQ)	printk("DataRequest ");
846 		if (stat & ATA_CORR)	printk("CorrectedError ");
847 		if (stat & ATA_SENSE)	printk("Sense ");
848 		if (stat & ATA_ERR)	printk("Error ");
849 		printk("}\n");
850 
851 		if (err) {
852 			printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
853 			if (err & ATA_ABORTED)	printk("DriveStatusError ");
854 			if (err & ATA_ICRC) {
855 				if (err & ATA_ABORTED)
856 						printk("BadCRC ");
857 				else		printk("Sector ");
858 			}
859 			if (err & ATA_UNC)	printk("UncorrectableError ");
860 			if (err & ATA_IDNF)	printk("SectorIdNotFound ");
861 			if (err & ATA_TRK0NF)	printk("TrackZeroNotFound ");
862 			if (err & ATA_AMNF)	printk("AddrMarkNotFound ");
863 			printk("}\n");
864 		}
865 	}
866 }
867 
868 /**
869  *	ata_to_sense_error - convert ATA error to SCSI error
870  *	@id: ATA device number
871  *	@drv_stat: value contained in ATA status register
872  *	@drv_err: value contained in ATA error register
873  *	@sk: the sense key we'll fill out
874  *	@asc: the additional sense code we'll fill out
875  *	@ascq: the additional sense code qualifier we'll fill out
876  *	@verbose: be verbose
877  *
878  *	Converts an ATA error into a SCSI error.  Fill out pointers to
879  *	SK, ASC, and ASCQ bytes for later use in fixed or descriptor
880  *	format sense blocks.
881  *
882  *	LOCKING:
883  *	spin_lock_irqsave(host lock)
884  */
885 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
886 			       u8 *asc, u8 *ascq, int verbose)
887 {
888 	int i;
889 
890 	/* Based on the 3ware driver translation table */
891 	static const unsigned char sense_table[][4] = {
892 		/* BBD|ECC|ID|MAR */
893 		{0xd1,		ABORTED_COMMAND, 0x00, 0x00},
894 			// Device busy                  Aborted command
895 		/* BBD|ECC|ID */
896 		{0xd0,		ABORTED_COMMAND, 0x00, 0x00},
897 			// Device busy                  Aborted command
898 		/* ECC|MC|MARK */
899 		{0x61,		HARDWARE_ERROR, 0x00, 0x00},
900 			// Device fault                 Hardware error
901 		/* ICRC|ABRT */		/* NB: ICRC & !ABRT is BBD */
902 		{0x84,		ABORTED_COMMAND, 0x47, 0x00},
903 			// Data CRC error               SCSI parity error
904 		/* MC|ID|ABRT|TRK0|MARK */
905 		{0x37,		NOT_READY, 0x04, 0x00},
906 			// Unit offline                 Not ready
907 		/* MCR|MARK */
908 		{0x09,		NOT_READY, 0x04, 0x00},
909 			// Unrecovered disk error       Not ready
910 		/*  Bad address mark */
911 		{0x01,		MEDIUM_ERROR, 0x13, 0x00},
912 			// Address mark not found for data field
913 		/* TRK0 - Track 0 not found */
914 		{0x02,		HARDWARE_ERROR, 0x00, 0x00},
915 			// Hardware error
916 		/* Abort: 0x04 is not translated here, see below */
917 		/* Media change request */
918 		{0x08,		NOT_READY, 0x04, 0x00},
919 			// FIXME: faking offline
920 		/* SRV/IDNF - ID not found */
921 		{0x10,		ILLEGAL_REQUEST, 0x21, 0x00},
922 			// Logical address out of range
923 		/* MC - Media Changed */
924 		{0x20,		UNIT_ATTENTION, 0x28, 0x00},
925 			// Not ready to ready change, medium may have changed
926 		/* ECC - Uncorrectable ECC error */
927 		{0x40,		MEDIUM_ERROR, 0x11, 0x04},
928 			// Unrecovered read error
929 		/* BBD - block marked bad */
930 		{0x80,		MEDIUM_ERROR, 0x11, 0x04},
931 			// Block marked bad	Medium error, unrecovered read error
932 		{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
933 	};
934 	static const unsigned char stat_table[][4] = {
935 		/* Must be first because BUSY means no other bits valid */
936 		{0x80,		ABORTED_COMMAND, 0x47, 0x00},
937 		// Busy, fake parity for now
938 		{0x40,		ILLEGAL_REQUEST, 0x21, 0x04},
939 		// Device ready, unaligned write command
940 		{0x20,		HARDWARE_ERROR,  0x44, 0x00},
941 		// Device fault, internal target failure
942 		{0x08,		ABORTED_COMMAND, 0x47, 0x00},
943 		// Timed out in xfer, fake parity for now
944 		{0x04,		RECOVERED_ERROR, 0x11, 0x00},
945 		// Recovered ECC error	  Medium error, recovered
946 		{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
947 	};
948 
949 	/*
950 	 *	Is this an error we can process/parse
951 	 */
952 	if (drv_stat & ATA_BUSY) {
953 		drv_err = 0;	/* Ignore the err bits, they're invalid */
954 	}
955 
956 	if (drv_err) {
957 		/* Look for drv_err */
958 		for (i = 0; sense_table[i][0] != 0xFF; i++) {
959 			/* Look for best matches first */
960 			if ((sense_table[i][0] & drv_err) ==
961 			    sense_table[i][0]) {
962 				*sk = sense_table[i][1];
963 				*asc = sense_table[i][2];
964 				*ascq = sense_table[i][3];
965 				goto translate_done;
966 			}
967 		}
968 	}
969 
970 	/*
971 	 * Fall back to interpreting status bits.  Note that if the drv_err
972 	 * has only the ABRT bit set, we decode drv_stat.  ABRT by itself
973 	 * is not descriptive enough.
974 	 */
975 	for (i = 0; stat_table[i][0] != 0xFF; i++) {
976 		if (stat_table[i][0] & drv_stat) {
977 			*sk = stat_table[i][1];
978 			*asc = stat_table[i][2];
979 			*ascq = stat_table[i][3];
980 			goto translate_done;
981 		}
982 	}
983 
984 	/*
985 	 * We need a sensible error return here, which is tricky, and one
986 	 * that won't cause people to do things like return a disk wrongly.
987 	 */
988 	*sk = ABORTED_COMMAND;
989 	*asc = 0x00;
990 	*ascq = 0x00;
991 
992  translate_done:
993 	if (verbose)
994 		printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
995 		       "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
996 		       id, drv_stat, drv_err, *sk, *asc, *ascq);
997 	return;
998 }
999 
1000 /*
1001  *	ata_gen_passthru_sense - Generate check condition sense block.
1002  *	@qc: Command that completed.
1003  *
1004  *	This function is specific to the ATA descriptor format sense
1005  *	block specified for the ATA pass through commands.  Regardless
1006  *	of whether the command errored or not, return a sense
1007  *	block. Copy all controller registers into the sense
1008  *	block. If there was no error, we get the request from an ATA
1009  *	passthrough command, so we use the following sense data:
1010  *	sk = RECOVERED ERROR
1011  *	asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
1012  *
1013  *
1014  *	LOCKING:
1015  *	None.
1016  */
1017 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
1018 {
1019 	struct scsi_cmnd *cmd = qc->scsicmd;
1020 	struct ata_taskfile *tf = &qc->result_tf;
1021 	unsigned char *sb = cmd->sense_buffer;
1022 	unsigned char *desc = sb + 8;
1023 	int verbose = qc->ap->ops->error_handler == NULL;
1024 	u8 sense_key, asc, ascq;
1025 
1026 	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1027 
1028 	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
1029 
1030 	/*
1031 	 * Use ata_to_sense_error() to map status register bits
1032 	 * onto sense key, asc & ascq.
1033 	 */
1034 	if (qc->err_mask ||
1035 	    tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
1036 		ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
1037 				   &sense_key, &asc, &ascq, verbose);
1038 		ata_scsi_set_sense(qc->dev, cmd, sense_key, asc, ascq);
1039 	} else {
1040 		/*
1041 		 * ATA PASS-THROUGH INFORMATION AVAILABLE
1042 		 * Always in descriptor format sense.
1043 		 */
1044 		scsi_build_sense_buffer(1, cmd->sense_buffer,
1045 					RECOVERED_ERROR, 0, 0x1D);
1046 	}
1047 
1048 	if ((cmd->sense_buffer[0] & 0x7f) >= 0x72) {
1049 		u8 len;
1050 
1051 		/* descriptor format */
1052 		len = sb[7];
1053 		desc = (char *)scsi_sense_desc_find(sb, len + 8, 9);
1054 		if (!desc) {
1055 			if (SCSI_SENSE_BUFFERSIZE < len + 14)
1056 				return;
1057 			sb[7] = len + 14;
1058 			desc = sb + 8 + len;
1059 		}
1060 		desc[0] = 9;
1061 		desc[1] = 12;
1062 		/*
1063 		 * Copy registers into sense buffer.
1064 		 */
1065 		desc[2] = 0x00;
1066 		desc[3] = tf->feature;	/* == error reg */
1067 		desc[5] = tf->nsect;
1068 		desc[7] = tf->lbal;
1069 		desc[9] = tf->lbam;
1070 		desc[11] = tf->lbah;
1071 		desc[12] = tf->device;
1072 		desc[13] = tf->command; /* == status reg */
1073 
1074 		/*
1075 		 * Fill in Extend bit, and the high order bytes
1076 		 * if applicable.
1077 		 */
1078 		if (tf->flags & ATA_TFLAG_LBA48) {
1079 			desc[2] |= 0x01;
1080 			desc[4] = tf->hob_nsect;
1081 			desc[6] = tf->hob_lbal;
1082 			desc[8] = tf->hob_lbam;
1083 			desc[10] = tf->hob_lbah;
1084 		}
1085 	} else {
1086 		/* Fixed sense format */
1087 		desc[0] = tf->feature;
1088 		desc[1] = tf->command; /* status */
1089 		desc[2] = tf->device;
1090 		desc[3] = tf->nsect;
1091 		desc[0] = 0;
1092 		if (tf->flags & ATA_TFLAG_LBA48)  {
1093 			desc[8] |= 0x80;
1094 			if (tf->hob_nsect)
1095 				desc[8] |= 0x40;
1096 			if (tf->hob_lbal || tf->hob_lbam || tf->hob_lbah)
1097 				desc[8] |= 0x20;
1098 		}
1099 		desc[9] = tf->lbal;
1100 		desc[10] = tf->lbam;
1101 		desc[11] = tf->lbah;
1102 	}
1103 }
1104 
1105 /**
1106  *	ata_gen_ata_sense - generate a SCSI fixed sense block
1107  *	@qc: Command that we are erroring out
1108  *
1109  *	Generate sense block for a failed ATA command @qc.  Descriptor
1110  *	format is used to accommodate LBA48 block address.
1111  *
1112  *	LOCKING:
1113  *	None.
1114  */
1115 static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
1116 {
1117 	struct ata_device *dev = qc->dev;
1118 	struct scsi_cmnd *cmd = qc->scsicmd;
1119 	struct ata_taskfile *tf = &qc->result_tf;
1120 	unsigned char *sb = cmd->sense_buffer;
1121 	int verbose = qc->ap->ops->error_handler == NULL;
1122 	u64 block;
1123 	u8 sense_key, asc, ascq;
1124 
1125 	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1126 
1127 	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
1128 
1129 	if (ata_dev_disabled(dev)) {
1130 		/* Device disabled after error recovery */
1131 		/* LOGICAL UNIT NOT READY, HARD RESET REQUIRED */
1132 		ata_scsi_set_sense(dev, cmd, NOT_READY, 0x04, 0x21);
1133 		return;
1134 	}
1135 	/* Use ata_to_sense_error() to map status register bits
1136 	 * onto sense key, asc & ascq.
1137 	 */
1138 	if (qc->err_mask ||
1139 	    tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
1140 		ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
1141 				   &sense_key, &asc, &ascq, verbose);
1142 		ata_scsi_set_sense(dev, cmd, sense_key, asc, ascq);
1143 	} else {
1144 		/* Could not decode error */
1145 		ata_dev_warn(dev, "could not decode error status 0x%x err_mask 0x%x\n",
1146 			     tf->command, qc->err_mask);
1147 		ata_scsi_set_sense(dev, cmd, ABORTED_COMMAND, 0, 0);
1148 		return;
1149 	}
1150 
1151 	block = ata_tf_read_block(&qc->result_tf, dev);
1152 	if (block == U64_MAX)
1153 		return;
1154 
1155 	scsi_set_sense_information(sb, SCSI_SENSE_BUFFERSIZE, block);
1156 }
1157 
1158 static void ata_scsi_sdev_config(struct scsi_device *sdev)
1159 {
1160 	sdev->use_10_for_rw = 1;
1161 	sdev->use_10_for_ms = 1;
1162 
1163 	/* Schedule policy is determined by ->qc_defer() callback and
1164 	 * it needs to see every deferred qc.  Set dev_blocked to 1 to
1165 	 * prevent SCSI midlayer from automatically deferring
1166 	 * requests.
1167 	 */
1168 	sdev->max_device_blocked = 1;
1169 }
1170 
1171 /**
1172  *	atapi_drain_needed - Check whether data transfer may overflow
1173  *	@rq: request to be checked
1174  *
1175  *	ATAPI commands which transfer variable length data to host
1176  *	might overflow due to application error or hardware bug.  This
1177  *	function checks whether overflow should be drained and ignored
1178  *	for @request.
1179  *
1180  *	LOCKING:
1181  *	None.
1182  *
1183  *	RETURNS:
1184  *	1 if ; otherwise, 0.
1185  */
1186 static int atapi_drain_needed(struct request *rq)
1187 {
1188 	if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
1189 		return 0;
1190 
1191 	if (!blk_rq_bytes(rq) || op_is_write(req_op(rq)))
1192 		return 0;
1193 
1194 	return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1195 }
1196 
1197 static int ata_scsi_dev_config(struct scsi_device *sdev,
1198 			       struct ata_device *dev)
1199 {
1200 	struct request_queue *q = sdev->request_queue;
1201 
1202 	if (!ata_id_has_unload(dev->id))
1203 		dev->flags |= ATA_DFLAG_NO_UNLOAD;
1204 
1205 	/* configure max sectors */
1206 	blk_queue_max_hw_sectors(q, dev->max_sectors);
1207 
1208 	if (dev->class == ATA_DEV_ATAPI) {
1209 		void *buf;
1210 
1211 		sdev->sector_size = ATA_SECT_SIZE;
1212 
1213 		/* set DMA padding */
1214 		blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
1215 
1216 		/* configure draining */
1217 		buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1218 		if (!buf) {
1219 			ata_dev_err(dev, "drain buffer allocation failed\n");
1220 			return -ENOMEM;
1221 		}
1222 
1223 		blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1224 	} else {
1225 		sdev->sector_size = ata_id_logical_sector_size(dev->id);
1226 		sdev->manage_start_stop = 1;
1227 	}
1228 
1229 	/*
1230 	 * ata_pio_sectors() expects buffer for each sector to not cross
1231 	 * page boundary.  Enforce it by requiring buffers to be sector
1232 	 * aligned, which works iff sector_size is not larger than
1233 	 * PAGE_SIZE.  ATAPI devices also need the alignment as
1234 	 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1235 	 */
1236 	if (sdev->sector_size > PAGE_SIZE)
1237 		ata_dev_warn(dev,
1238 			"sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1239 			sdev->sector_size);
1240 
1241 	blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
1242 
1243 	if (dev->flags & ATA_DFLAG_AN)
1244 		set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1245 
1246 	if (dev->flags & ATA_DFLAG_NCQ) {
1247 		int depth;
1248 
1249 		depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1250 		depth = min(ATA_MAX_QUEUE - 1, depth);
1251 		scsi_change_queue_depth(sdev, depth);
1252 	}
1253 
1254 	blk_queue_flush_queueable(q, false);
1255 
1256 	dev->sdev = sdev;
1257 	return 0;
1258 }
1259 
1260 /**
1261  *	ata_scsi_slave_config - Set SCSI device attributes
1262  *	@sdev: SCSI device to examine
1263  *
1264  *	This is called before we actually start reading
1265  *	and writing to the device, to configure certain
1266  *	SCSI mid-layer behaviors.
1267  *
1268  *	LOCKING:
1269  *	Defined by SCSI layer.  We don't really care.
1270  */
1271 
1272 int ata_scsi_slave_config(struct scsi_device *sdev)
1273 {
1274 	struct ata_port *ap = ata_shost_to_port(sdev->host);
1275 	struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1276 	int rc = 0;
1277 
1278 	ata_scsi_sdev_config(sdev);
1279 
1280 	if (dev)
1281 		rc = ata_scsi_dev_config(sdev, dev);
1282 
1283 	return rc;
1284 }
1285 
1286 /**
1287  *	ata_scsi_slave_destroy - SCSI device is about to be destroyed
1288  *	@sdev: SCSI device to be destroyed
1289  *
1290  *	@sdev is about to be destroyed for hot/warm unplugging.  If
1291  *	this unplugging was initiated by libata as indicated by NULL
1292  *	dev->sdev, this function doesn't have to do anything.
1293  *	Otherwise, SCSI layer initiated warm-unplug is in progress.
1294  *	Clear dev->sdev, schedule the device for ATA detach and invoke
1295  *	EH.
1296  *
1297  *	LOCKING:
1298  *	Defined by SCSI layer.  We don't really care.
1299  */
1300 void ata_scsi_slave_destroy(struct scsi_device *sdev)
1301 {
1302 	struct ata_port *ap = ata_shost_to_port(sdev->host);
1303 	struct request_queue *q = sdev->request_queue;
1304 	unsigned long flags;
1305 	struct ata_device *dev;
1306 
1307 	if (!ap->ops->error_handler)
1308 		return;
1309 
1310 	spin_lock_irqsave(ap->lock, flags);
1311 	dev = __ata_scsi_find_dev(ap, sdev);
1312 	if (dev && dev->sdev) {
1313 		/* SCSI device already in CANCEL state, no need to offline it */
1314 		dev->sdev = NULL;
1315 		dev->flags |= ATA_DFLAG_DETACH;
1316 		ata_port_schedule_eh(ap);
1317 	}
1318 	spin_unlock_irqrestore(ap->lock, flags);
1319 
1320 	kfree(q->dma_drain_buffer);
1321 	q->dma_drain_buffer = NULL;
1322 	q->dma_drain_size = 0;
1323 }
1324 
1325 /**
1326  *	__ata_change_queue_depth - helper for ata_scsi_change_queue_depth
1327  *	@ap: ATA port to which the device change the queue depth
1328  *	@sdev: SCSI device to configure queue depth for
1329  *	@queue_depth: new queue depth
1330  *
1331  *	libsas and libata have different approaches for associating a sdev to
1332  *	its ata_port.
1333  *
1334  */
1335 int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
1336 			     int queue_depth)
1337 {
1338 	struct ata_device *dev;
1339 	unsigned long flags;
1340 
1341 	if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1342 		return sdev->queue_depth;
1343 
1344 	dev = ata_scsi_find_dev(ap, sdev);
1345 	if (!dev || !ata_dev_enabled(dev))
1346 		return sdev->queue_depth;
1347 
1348 	/* NCQ enabled? */
1349 	spin_lock_irqsave(ap->lock, flags);
1350 	dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1351 	if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1352 		dev->flags |= ATA_DFLAG_NCQ_OFF;
1353 		queue_depth = 1;
1354 	}
1355 	spin_unlock_irqrestore(ap->lock, flags);
1356 
1357 	/* limit and apply queue depth */
1358 	queue_depth = min(queue_depth, sdev->host->can_queue);
1359 	queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1360 	queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1361 
1362 	if (sdev->queue_depth == queue_depth)
1363 		return -EINVAL;
1364 
1365 	return scsi_change_queue_depth(sdev, queue_depth);
1366 }
1367 
1368 /**
1369  *	ata_scsi_change_queue_depth - SCSI callback for queue depth config
1370  *	@sdev: SCSI device to configure queue depth for
1371  *	@queue_depth: new queue depth
1372  *
1373  *	This is libata standard hostt->change_queue_depth callback.
1374  *	SCSI will call into this callback when user tries to set queue
1375  *	depth via sysfs.
1376  *
1377  *	LOCKING:
1378  *	SCSI layer (we don't care)
1379  *
1380  *	RETURNS:
1381  *	Newly configured queue depth.
1382  */
1383 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
1384 {
1385 	struct ata_port *ap = ata_shost_to_port(sdev->host);
1386 
1387 	return __ata_change_queue_depth(ap, sdev, queue_depth);
1388 }
1389 
1390 /**
1391  *	ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1392  *	@qc: Storage for translated ATA taskfile
1393  *
1394  *	Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1395  *	(to start). Perhaps these commands should be preceded by
1396  *	CHECK POWER MODE to see what power mode the device is already in.
1397  *	[See SAT revision 5 at www.t10.org]
1398  *
1399  *	LOCKING:
1400  *	spin_lock_irqsave(host lock)
1401  *
1402  *	RETURNS:
1403  *	Zero on success, non-zero on error.
1404  */
1405 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1406 {
1407 	struct scsi_cmnd *scmd = qc->scsicmd;
1408 	struct ata_taskfile *tf = &qc->tf;
1409 	const u8 *cdb = scmd->cmnd;
1410 	u16 fp;
1411 	u8 bp = 0xff;
1412 
1413 	if (scmd->cmd_len < 5) {
1414 		fp = 4;
1415 		goto invalid_fld;
1416 	}
1417 
1418 	tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1419 	tf->protocol = ATA_PROT_NODATA;
1420 	if (cdb[1] & 0x1) {
1421 		;	/* ignore IMMED bit, violates sat-r05 */
1422 	}
1423 	if (cdb[4] & 0x2) {
1424 		fp = 4;
1425 		bp = 1;
1426 		goto invalid_fld;       /* LOEJ bit set not supported */
1427 	}
1428 	if (((cdb[4] >> 4) & 0xf) != 0) {
1429 		fp = 4;
1430 		bp = 3;
1431 		goto invalid_fld;       /* power conditions not supported */
1432 	}
1433 
1434 	if (cdb[4] & 0x1) {
1435 		tf->nsect = 1;	/* 1 sector, lba=0 */
1436 
1437 		if (qc->dev->flags & ATA_DFLAG_LBA) {
1438 			tf->flags |= ATA_TFLAG_LBA;
1439 
1440 			tf->lbah = 0x0;
1441 			tf->lbam = 0x0;
1442 			tf->lbal = 0x0;
1443 			tf->device |= ATA_LBA;
1444 		} else {
1445 			/* CHS */
1446 			tf->lbal = 0x1; /* sect */
1447 			tf->lbam = 0x0; /* cyl low */
1448 			tf->lbah = 0x0; /* cyl high */
1449 		}
1450 
1451 		tf->command = ATA_CMD_VERIFY;	/* READ VERIFY */
1452 	} else {
1453 		/* Some odd clown BIOSen issue spindown on power off (ACPI S4
1454 		 * or S5) causing some drives to spin up and down again.
1455 		 */
1456 		if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1457 		    system_state == SYSTEM_POWER_OFF)
1458 			goto skip;
1459 
1460 		if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1461 		     system_entering_hibernation())
1462 			goto skip;
1463 
1464 		/* Issue ATA STANDBY IMMEDIATE command */
1465 		tf->command = ATA_CMD_STANDBYNOW1;
1466 	}
1467 
1468 	/*
1469 	 * Standby and Idle condition timers could be implemented but that
1470 	 * would require libata to implement the Power condition mode page
1471 	 * and allow the user to change it. Changing mode pages requires
1472 	 * MODE SELECT to be implemented.
1473 	 */
1474 
1475 	return 0;
1476 
1477  invalid_fld:
1478 	ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp);
1479 	return 1;
1480  skip:
1481 	scmd->result = SAM_STAT_GOOD;
1482 	return 1;
1483 }
1484 
1485 
1486 /**
1487  *	ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1488  *	@qc: Storage for translated ATA taskfile
1489  *
1490  *	Sets up an ATA taskfile to issue FLUSH CACHE or
1491  *	FLUSH CACHE EXT.
1492  *
1493  *	LOCKING:
1494  *	spin_lock_irqsave(host lock)
1495  *
1496  *	RETURNS:
1497  *	Zero on success, non-zero on error.
1498  */
1499 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1500 {
1501 	struct ata_taskfile *tf = &qc->tf;
1502 
1503 	tf->flags |= ATA_TFLAG_DEVICE;
1504 	tf->protocol = ATA_PROT_NODATA;
1505 
1506 	if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1507 		tf->command = ATA_CMD_FLUSH_EXT;
1508 	else
1509 		tf->command = ATA_CMD_FLUSH;
1510 
1511 	/* flush is critical for IO integrity, consider it an IO command */
1512 	qc->flags |= ATA_QCFLAG_IO;
1513 
1514 	return 0;
1515 }
1516 
1517 /**
1518  *	scsi_6_lba_len - Get LBA and transfer length
1519  *	@cdb: SCSI command to translate
1520  *
1521  *	Calculate LBA and transfer length for 6-byte commands.
1522  *
1523  *	RETURNS:
1524  *	@plba: the LBA
1525  *	@plen: the transfer length
1526  */
1527 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1528 {
1529 	u64 lba = 0;
1530 	u32 len;
1531 
1532 	VPRINTK("six-byte command\n");
1533 
1534 	lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1535 	lba |= ((u64)cdb[2]) << 8;
1536 	lba |= ((u64)cdb[3]);
1537 
1538 	len = cdb[4];
1539 
1540 	*plba = lba;
1541 	*plen = len;
1542 }
1543 
1544 /**
1545  *	scsi_10_lba_len - Get LBA and transfer length
1546  *	@cdb: SCSI command to translate
1547  *
1548  *	Calculate LBA and transfer length for 10-byte commands.
1549  *
1550  *	RETURNS:
1551  *	@plba: the LBA
1552  *	@plen: the transfer length
1553  */
1554 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1555 {
1556 	u64 lba = 0;
1557 	u32 len = 0;
1558 
1559 	VPRINTK("ten-byte command\n");
1560 
1561 	lba |= ((u64)cdb[2]) << 24;
1562 	lba |= ((u64)cdb[3]) << 16;
1563 	lba |= ((u64)cdb[4]) << 8;
1564 	lba |= ((u64)cdb[5]);
1565 
1566 	len |= ((u32)cdb[7]) << 8;
1567 	len |= ((u32)cdb[8]);
1568 
1569 	*plba = lba;
1570 	*plen = len;
1571 }
1572 
1573 /**
1574  *	scsi_16_lba_len - Get LBA and transfer length
1575  *	@cdb: SCSI command to translate
1576  *
1577  *	Calculate LBA and transfer length for 16-byte commands.
1578  *
1579  *	RETURNS:
1580  *	@plba: the LBA
1581  *	@plen: the transfer length
1582  */
1583 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1584 {
1585 	u64 lba = 0;
1586 	u32 len = 0;
1587 
1588 	VPRINTK("sixteen-byte command\n");
1589 
1590 	lba |= ((u64)cdb[2]) << 56;
1591 	lba |= ((u64)cdb[3]) << 48;
1592 	lba |= ((u64)cdb[4]) << 40;
1593 	lba |= ((u64)cdb[5]) << 32;
1594 	lba |= ((u64)cdb[6]) << 24;
1595 	lba |= ((u64)cdb[7]) << 16;
1596 	lba |= ((u64)cdb[8]) << 8;
1597 	lba |= ((u64)cdb[9]);
1598 
1599 	len |= ((u32)cdb[10]) << 24;
1600 	len |= ((u32)cdb[11]) << 16;
1601 	len |= ((u32)cdb[12]) << 8;
1602 	len |= ((u32)cdb[13]);
1603 
1604 	*plba = lba;
1605 	*plen = len;
1606 }
1607 
1608 /**
1609  *	ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1610  *	@qc: Storage for translated ATA taskfile
1611  *
1612  *	Converts SCSI VERIFY command to an ATA READ VERIFY command.
1613  *
1614  *	LOCKING:
1615  *	spin_lock_irqsave(host lock)
1616  *
1617  *	RETURNS:
1618  *	Zero on success, non-zero on error.
1619  */
1620 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1621 {
1622 	struct scsi_cmnd *scmd = qc->scsicmd;
1623 	struct ata_taskfile *tf = &qc->tf;
1624 	struct ata_device *dev = qc->dev;
1625 	u64 dev_sectors = qc->dev->n_sectors;
1626 	const u8 *cdb = scmd->cmnd;
1627 	u64 block;
1628 	u32 n_block;
1629 	u16 fp;
1630 
1631 	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1632 	tf->protocol = ATA_PROT_NODATA;
1633 
1634 	if (cdb[0] == VERIFY) {
1635 		if (scmd->cmd_len < 10) {
1636 			fp = 9;
1637 			goto invalid_fld;
1638 		}
1639 		scsi_10_lba_len(cdb, &block, &n_block);
1640 	} else if (cdb[0] == VERIFY_16) {
1641 		if (scmd->cmd_len < 16) {
1642 			fp = 15;
1643 			goto invalid_fld;
1644 		}
1645 		scsi_16_lba_len(cdb, &block, &n_block);
1646 	} else {
1647 		fp = 0;
1648 		goto invalid_fld;
1649 	}
1650 
1651 	if (!n_block)
1652 		goto nothing_to_do;
1653 	if (block >= dev_sectors)
1654 		goto out_of_range;
1655 	if ((block + n_block) > dev_sectors)
1656 		goto out_of_range;
1657 
1658 	if (dev->flags & ATA_DFLAG_LBA) {
1659 		tf->flags |= ATA_TFLAG_LBA;
1660 
1661 		if (lba_28_ok(block, n_block)) {
1662 			/* use LBA28 */
1663 			tf->command = ATA_CMD_VERIFY;
1664 			tf->device |= (block >> 24) & 0xf;
1665 		} else if (lba_48_ok(block, n_block)) {
1666 			if (!(dev->flags & ATA_DFLAG_LBA48))
1667 				goto out_of_range;
1668 
1669 			/* use LBA48 */
1670 			tf->flags |= ATA_TFLAG_LBA48;
1671 			tf->command = ATA_CMD_VERIFY_EXT;
1672 
1673 			tf->hob_nsect = (n_block >> 8) & 0xff;
1674 
1675 			tf->hob_lbah = (block >> 40) & 0xff;
1676 			tf->hob_lbam = (block >> 32) & 0xff;
1677 			tf->hob_lbal = (block >> 24) & 0xff;
1678 		} else
1679 			/* request too large even for LBA48 */
1680 			goto out_of_range;
1681 
1682 		tf->nsect = n_block & 0xff;
1683 
1684 		tf->lbah = (block >> 16) & 0xff;
1685 		tf->lbam = (block >> 8) & 0xff;
1686 		tf->lbal = block & 0xff;
1687 
1688 		tf->device |= ATA_LBA;
1689 	} else {
1690 		/* CHS */
1691 		u32 sect, head, cyl, track;
1692 
1693 		if (!lba_28_ok(block, n_block))
1694 			goto out_of_range;
1695 
1696 		/* Convert LBA to CHS */
1697 		track = (u32)block / dev->sectors;
1698 		cyl   = track / dev->heads;
1699 		head  = track % dev->heads;
1700 		sect  = (u32)block % dev->sectors + 1;
1701 
1702 		DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1703 			(u32)block, track, cyl, head, sect);
1704 
1705 		/* Check whether the converted CHS can fit.
1706 		   Cylinder: 0-65535
1707 		   Head: 0-15
1708 		   Sector: 1-255*/
1709 		if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1710 			goto out_of_range;
1711 
1712 		tf->command = ATA_CMD_VERIFY;
1713 		tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1714 		tf->lbal = sect;
1715 		tf->lbam = cyl;
1716 		tf->lbah = cyl >> 8;
1717 		tf->device |= head;
1718 	}
1719 
1720 	return 0;
1721 
1722 invalid_fld:
1723 	ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff);
1724 	return 1;
1725 
1726 out_of_range:
1727 	ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1728 	/* "Logical Block Address out of range" */
1729 	return 1;
1730 
1731 nothing_to_do:
1732 	scmd->result = SAM_STAT_GOOD;
1733 	return 1;
1734 }
1735 
1736 /**
1737  *	ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1738  *	@qc: Storage for translated ATA taskfile
1739  *
1740  *	Converts any of six SCSI read/write commands into the
1741  *	ATA counterpart, including starting sector (LBA),
1742  *	sector count, and taking into account the device's LBA48
1743  *	support.
1744  *
1745  *	Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1746  *	%WRITE_16 are currently supported.
1747  *
1748  *	LOCKING:
1749  *	spin_lock_irqsave(host lock)
1750  *
1751  *	RETURNS:
1752  *	Zero on success, non-zero on error.
1753  */
1754 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1755 {
1756 	struct scsi_cmnd *scmd = qc->scsicmd;
1757 	const u8 *cdb = scmd->cmnd;
1758 	unsigned int tf_flags = 0;
1759 	u64 block;
1760 	u32 n_block;
1761 	int rc;
1762 	u16 fp = 0;
1763 
1764 	if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1765 		tf_flags |= ATA_TFLAG_WRITE;
1766 
1767 	/* Calculate the SCSI LBA, transfer length and FUA. */
1768 	switch (cdb[0]) {
1769 	case READ_10:
1770 	case WRITE_10:
1771 		if (unlikely(scmd->cmd_len < 10)) {
1772 			fp = 9;
1773 			goto invalid_fld;
1774 		}
1775 		scsi_10_lba_len(cdb, &block, &n_block);
1776 		if (cdb[1] & (1 << 3))
1777 			tf_flags |= ATA_TFLAG_FUA;
1778 		break;
1779 	case READ_6:
1780 	case WRITE_6:
1781 		if (unlikely(scmd->cmd_len < 6)) {
1782 			fp = 5;
1783 			goto invalid_fld;
1784 		}
1785 		scsi_6_lba_len(cdb, &block, &n_block);
1786 
1787 		/* for 6-byte r/w commands, transfer length 0
1788 		 * means 256 blocks of data, not 0 block.
1789 		 */
1790 		if (!n_block)
1791 			n_block = 256;
1792 		break;
1793 	case READ_16:
1794 	case WRITE_16:
1795 		if (unlikely(scmd->cmd_len < 16)) {
1796 			fp = 15;
1797 			goto invalid_fld;
1798 		}
1799 		scsi_16_lba_len(cdb, &block, &n_block);
1800 		if (cdb[1] & (1 << 3))
1801 			tf_flags |= ATA_TFLAG_FUA;
1802 		break;
1803 	default:
1804 		DPRINTK("no-byte command\n");
1805 		fp = 0;
1806 		goto invalid_fld;
1807 	}
1808 
1809 	/* Check and compose ATA command */
1810 	if (!n_block)
1811 		/* For 10-byte and 16-byte SCSI R/W commands, transfer
1812 		 * length 0 means transfer 0 block of data.
1813 		 * However, for ATA R/W commands, sector count 0 means
1814 		 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1815 		 *
1816 		 * WARNING: one or two older ATA drives treat 0 as 0...
1817 		 */
1818 		goto nothing_to_do;
1819 
1820 	qc->flags |= ATA_QCFLAG_IO;
1821 	qc->nbytes = n_block * scmd->device->sector_size;
1822 
1823 	rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1824 			     qc->tag);
1825 	if (likely(rc == 0))
1826 		return 0;
1827 
1828 	if (rc == -ERANGE)
1829 		goto out_of_range;
1830 	/* treat all other errors as -EINVAL, fall through */
1831 invalid_fld:
1832 	ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff);
1833 	return 1;
1834 
1835 out_of_range:
1836 	ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1837 	/* "Logical Block Address out of range" */
1838 	return 1;
1839 
1840 nothing_to_do:
1841 	scmd->result = SAM_STAT_GOOD;
1842 	return 1;
1843 }
1844 
1845 static void ata_qc_done(struct ata_queued_cmd *qc)
1846 {
1847 	struct scsi_cmnd *cmd = qc->scsicmd;
1848 	void (*done)(struct scsi_cmnd *) = qc->scsidone;
1849 
1850 	ata_qc_free(qc);
1851 	done(cmd);
1852 }
1853 
1854 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1855 {
1856 	struct ata_port *ap = qc->ap;
1857 	struct scsi_cmnd *cmd = qc->scsicmd;
1858 	u8 *cdb = cmd->cmnd;
1859 	int need_sense = (qc->err_mask != 0);
1860 
1861 	/* For ATA pass thru (SAT) commands, generate a sense block if
1862 	 * user mandated it or if there's an error.  Note that if we
1863 	 * generate because the user forced us to [CK_COND =1], a check
1864 	 * condition is generated and the ATA register values are returned
1865 	 * whether the command completed successfully or not. If there
1866 	 * was no error, we use the following sense data:
1867 	 * sk = RECOVERED ERROR
1868 	 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
1869 	 */
1870 	if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1871 	    ((cdb[2] & 0x20) || need_sense))
1872 		ata_gen_passthru_sense(qc);
1873 	else if (qc->flags & ATA_QCFLAG_SENSE_VALID)
1874 		cmd->result = SAM_STAT_CHECK_CONDITION;
1875 	else if (need_sense)
1876 		ata_gen_ata_sense(qc);
1877 	else
1878 		cmd->result = SAM_STAT_GOOD;
1879 
1880 	if (need_sense && !ap->ops->error_handler)
1881 		ata_dump_status(ap->print_id, &qc->result_tf);
1882 
1883 	ata_qc_done(qc);
1884 }
1885 
1886 /**
1887  *	ata_scsi_translate - Translate then issue SCSI command to ATA device
1888  *	@dev: ATA device to which the command is addressed
1889  *	@cmd: SCSI command to execute
1890  *	@xlat_func: Actor which translates @cmd to an ATA taskfile
1891  *
1892  *	Our ->queuecommand() function has decided that the SCSI
1893  *	command issued can be directly translated into an ATA
1894  *	command, rather than handled internally.
1895  *
1896  *	This function sets up an ata_queued_cmd structure for the
1897  *	SCSI command, and sends that ata_queued_cmd to the hardware.
1898  *
1899  *	The xlat_func argument (actor) returns 0 if ready to execute
1900  *	ATA command, else 1 to finish translation. If 1 is returned
1901  *	then cmd->result (and possibly cmd->sense_buffer) are assumed
1902  *	to be set reflecting an error condition or clean (early)
1903  *	termination.
1904  *
1905  *	LOCKING:
1906  *	spin_lock_irqsave(host lock)
1907  *
1908  *	RETURNS:
1909  *	0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1910  *	needs to be deferred.
1911  */
1912 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1913 			      ata_xlat_func_t xlat_func)
1914 {
1915 	struct ata_port *ap = dev->link->ap;
1916 	struct ata_queued_cmd *qc;
1917 	int rc;
1918 
1919 	VPRINTK("ENTER\n");
1920 
1921 	qc = ata_scsi_qc_new(dev, cmd);
1922 	if (!qc)
1923 		goto err_mem;
1924 
1925 	/* data is present; dma-map it */
1926 	if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1927 	    cmd->sc_data_direction == DMA_TO_DEVICE) {
1928 		if (unlikely(scsi_bufflen(cmd) < 1)) {
1929 			ata_dev_warn(dev, "WARNING: zero len r/w req\n");
1930 			goto err_did;
1931 		}
1932 
1933 		ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1934 
1935 		qc->dma_dir = cmd->sc_data_direction;
1936 	}
1937 
1938 	qc->complete_fn = ata_scsi_qc_complete;
1939 
1940 	if (xlat_func(qc))
1941 		goto early_finish;
1942 
1943 	if (ap->ops->qc_defer) {
1944 		if ((rc = ap->ops->qc_defer(qc)))
1945 			goto defer;
1946 	}
1947 
1948 	/* select device, send command to hardware */
1949 	ata_qc_issue(qc);
1950 
1951 	VPRINTK("EXIT\n");
1952 	return 0;
1953 
1954 early_finish:
1955 	ata_qc_free(qc);
1956 	cmd->scsi_done(cmd);
1957 	DPRINTK("EXIT - early finish (good or error)\n");
1958 	return 0;
1959 
1960 err_did:
1961 	ata_qc_free(qc);
1962 	cmd->result = (DID_ERROR << 16);
1963 	cmd->scsi_done(cmd);
1964 err_mem:
1965 	DPRINTK("EXIT - internal\n");
1966 	return 0;
1967 
1968 defer:
1969 	ata_qc_free(qc);
1970 	DPRINTK("EXIT - defer\n");
1971 	if (rc == ATA_DEFER_LINK)
1972 		return SCSI_MLQUEUE_DEVICE_BUSY;
1973 	else
1974 		return SCSI_MLQUEUE_HOST_BUSY;
1975 }
1976 
1977 /**
1978  *	ata_scsi_rbuf_get - Map response buffer.
1979  *	@cmd: SCSI command containing buffer to be mapped.
1980  *	@flags: unsigned long variable to store irq enable status
1981  *	@copy_in: copy in from user buffer
1982  *
1983  *	Prepare buffer for simulated SCSI commands.
1984  *
1985  *	LOCKING:
1986  *	spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1987  *
1988  *	RETURNS:
1989  *	Pointer to response buffer.
1990  */
1991 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1992 			       unsigned long *flags)
1993 {
1994 	spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1995 
1996 	memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1997 	if (copy_in)
1998 		sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1999 				  ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
2000 	return ata_scsi_rbuf;
2001 }
2002 
2003 /**
2004  *	ata_scsi_rbuf_put - Unmap response buffer.
2005  *	@cmd: SCSI command containing buffer to be unmapped.
2006  *	@copy_out: copy out result
2007  *	@flags: @flags passed to ata_scsi_rbuf_get()
2008  *
2009  *	Returns rbuf buffer.  The result is copied to @cmd's buffer if
2010  *	@copy_back is true.
2011  *
2012  *	LOCKING:
2013  *	Unlocks ata_scsi_rbuf_lock.
2014  */
2015 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
2016 				     unsigned long *flags)
2017 {
2018 	if (copy_out)
2019 		sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
2020 				    ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
2021 	spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
2022 }
2023 
2024 /**
2025  *	ata_scsi_rbuf_fill - wrapper for SCSI command simulators
2026  *	@args: device IDENTIFY data / SCSI command of interest.
2027  *	@actor: Callback hook for desired SCSI command simulator
2028  *
2029  *	Takes care of the hard work of simulating a SCSI command...
2030  *	Mapping the response buffer, calling the command's handler,
2031  *	and handling the handler's return value.  This return value
2032  *	indicates whether the handler wishes the SCSI command to be
2033  *	completed successfully (0), or not (in which case cmd->result
2034  *	and sense buffer are assumed to be set).
2035  *
2036  *	LOCKING:
2037  *	spin_lock_irqsave(host lock)
2038  */
2039 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
2040 		unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
2041 {
2042 	u8 *rbuf;
2043 	unsigned int rc;
2044 	struct scsi_cmnd *cmd = args->cmd;
2045 	unsigned long flags;
2046 
2047 	rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
2048 	rc = actor(args, rbuf);
2049 	ata_scsi_rbuf_put(cmd, rc == 0, &flags);
2050 
2051 	if (rc == 0)
2052 		cmd->result = SAM_STAT_GOOD;
2053 	args->done(cmd);
2054 }
2055 
2056 /**
2057  *	ata_scsiop_inq_std - Simulate INQUIRY command
2058  *	@args: device IDENTIFY data / SCSI command of interest.
2059  *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2060  *
2061  *	Returns standard device identification data associated
2062  *	with non-VPD INQUIRY command output.
2063  *
2064  *	LOCKING:
2065  *	spin_lock_irqsave(host lock)
2066  */
2067 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
2068 {
2069 	const u8 versions[] = {
2070 		0x00,
2071 		0x60,	/* SAM-3 (no version claimed) */
2072 
2073 		0x03,
2074 		0x20,	/* SBC-2 (no version claimed) */
2075 
2076 		0x03,
2077 		0x00	/* SPC-3 (no version claimed) */
2078 	};
2079 	const u8 versions_zbc[] = {
2080 		0x00,
2081 		0xA0,	/* SAM-5 (no version claimed) */
2082 
2083 		0x06,
2084 		0x00,	/* SBC-4 (no version claimed) */
2085 
2086 		0x05,
2087 		0xC0,	/* SPC-5 (no version claimed) */
2088 
2089 		0x60,
2090 		0x24,   /* ZBC r05 */
2091 	};
2092 
2093 	u8 hdr[] = {
2094 		TYPE_DISK,
2095 		0,
2096 		0x5,	/* claim SPC-3 version compatibility */
2097 		2,
2098 		95 - 4,
2099 		0,
2100 		0,
2101 		2
2102 	};
2103 
2104 	VPRINTK("ENTER\n");
2105 
2106 	/* set scsi removable (RMB) bit per ata bit, or if the
2107 	 * AHCI port says it's external (Hotplug-capable, eSATA).
2108 	 */
2109 	if (ata_id_removable(args->id) ||
2110 	    (args->dev->link->ap->pflags & ATA_PFLAG_EXTERNAL))
2111 		hdr[1] |= (1 << 7);
2112 
2113 	if (args->dev->class == ATA_DEV_ZAC) {
2114 		hdr[0] = TYPE_ZBC;
2115 		hdr[2] = 0x7; /* claim SPC-5 version compatibility */
2116 	}
2117 
2118 	memcpy(rbuf, hdr, sizeof(hdr));
2119 	memcpy(&rbuf[8], "ATA     ", 8);
2120 	ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
2121 
2122 	/* From SAT, use last 2 words from fw rev unless they are spaces */
2123 	ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4);
2124 	if (strncmp(&rbuf[32], "    ", 4) == 0)
2125 		ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
2126 
2127 	if (rbuf[32] == 0 || rbuf[32] == ' ')
2128 		memcpy(&rbuf[32], "n/a ", 4);
2129 
2130 	if (ata_id_zoned_cap(args->id) || args->dev->class == ATA_DEV_ZAC)
2131 		memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc));
2132 	else
2133 		memcpy(rbuf + 58, versions, sizeof(versions));
2134 
2135 	return 0;
2136 }
2137 
2138 /**
2139  *	ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
2140  *	@args: device IDENTIFY data / SCSI command of interest.
2141  *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2142  *
2143  *	Returns list of inquiry VPD pages available.
2144  *
2145  *	LOCKING:
2146  *	spin_lock_irqsave(host lock)
2147  */
2148 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
2149 {
2150 	int num_pages;
2151 	const u8 pages[] = {
2152 		0x00,	/* page 0x00, this page */
2153 		0x80,	/* page 0x80, unit serial no page */
2154 		0x83,	/* page 0x83, device ident page */
2155 		0x89,	/* page 0x89, ata info page */
2156 		0xb0,	/* page 0xb0, block limits page */
2157 		0xb1,	/* page 0xb1, block device characteristics page */
2158 		0xb2,	/* page 0xb2, thin provisioning page */
2159 		0xb6,	/* page 0xb6, zoned block device characteristics */
2160 	};
2161 
2162 	num_pages = sizeof(pages);
2163 	if (!(args->dev->flags & ATA_DFLAG_ZAC))
2164 		num_pages--;
2165 	rbuf[3] = num_pages;	/* number of supported VPD pages */
2166 	memcpy(rbuf + 4, pages, num_pages);
2167 	return 0;
2168 }
2169 
2170 /**
2171  *	ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
2172  *	@args: device IDENTIFY data / SCSI command of interest.
2173  *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2174  *
2175  *	Returns ATA device serial number.
2176  *
2177  *	LOCKING:
2178  *	spin_lock_irqsave(host lock)
2179  */
2180 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
2181 {
2182 	const u8 hdr[] = {
2183 		0,
2184 		0x80,			/* this page code */
2185 		0,
2186 		ATA_ID_SERNO_LEN,	/* page len */
2187 	};
2188 
2189 	memcpy(rbuf, hdr, sizeof(hdr));
2190 	ata_id_string(args->id, (unsigned char *) &rbuf[4],
2191 		      ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2192 	return 0;
2193 }
2194 
2195 /**
2196  *	ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2197  *	@args: device IDENTIFY data / SCSI command of interest.
2198  *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2199  *
2200  *	Yields two logical unit device identification designators:
2201  *	 - vendor specific ASCII containing the ATA serial number
2202  *	 - SAT defined "t10 vendor id based" containing ASCII vendor
2203  *	   name ("ATA     "), model and serial numbers.
2204  *
2205  *	LOCKING:
2206  *	spin_lock_irqsave(host lock)
2207  */
2208 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
2209 {
2210 	const int sat_model_serial_desc_len = 68;
2211 	int num;
2212 
2213 	rbuf[1] = 0x83;			/* this page code */
2214 	num = 4;
2215 
2216 	/* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2217 	rbuf[num + 0] = 2;
2218 	rbuf[num + 3] = ATA_ID_SERNO_LEN;
2219 	num += 4;
2220 	ata_id_string(args->id, (unsigned char *) rbuf + num,
2221 		      ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2222 	num += ATA_ID_SERNO_LEN;
2223 
2224 	/* SAT defined lu model and serial numbers descriptor */
2225 	/* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2226 	rbuf[num + 0] = 2;
2227 	rbuf[num + 1] = 1;
2228 	rbuf[num + 3] = sat_model_serial_desc_len;
2229 	num += 4;
2230 	memcpy(rbuf + num, "ATA     ", 8);
2231 	num += 8;
2232 	ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2233 		      ATA_ID_PROD_LEN);
2234 	num += ATA_ID_PROD_LEN;
2235 	ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2236 		      ATA_ID_SERNO_LEN);
2237 	num += ATA_ID_SERNO_LEN;
2238 
2239 	if (ata_id_has_wwn(args->id)) {
2240 		/* SAT defined lu world wide name */
2241 		/* piv=0, assoc=lu, code_set=binary, designator=NAA */
2242 		rbuf[num + 0] = 1;
2243 		rbuf[num + 1] = 3;
2244 		rbuf[num + 3] = ATA_ID_WWN_LEN;
2245 		num += 4;
2246 		ata_id_string(args->id, (unsigned char *) rbuf + num,
2247 			      ATA_ID_WWN, ATA_ID_WWN_LEN);
2248 		num += ATA_ID_WWN_LEN;
2249 	}
2250 	rbuf[3] = num - 4;    /* page len (assume less than 256 bytes) */
2251 	return 0;
2252 }
2253 
2254 /**
2255  *	ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2256  *	@args: device IDENTIFY data / SCSI command of interest.
2257  *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2258  *
2259  *	Yields SAT-specified ATA VPD page.
2260  *
2261  *	LOCKING:
2262  *	spin_lock_irqsave(host lock)
2263  */
2264 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
2265 {
2266 	struct ata_taskfile tf;
2267 
2268 	memset(&tf, 0, sizeof(tf));
2269 
2270 	rbuf[1] = 0x89;			/* our page code */
2271 	rbuf[2] = (0x238 >> 8);		/* page size fixed at 238h */
2272 	rbuf[3] = (0x238 & 0xff);
2273 
2274 	memcpy(&rbuf[8], "linux   ", 8);
2275 	memcpy(&rbuf[16], "libata          ", 16);
2276 	memcpy(&rbuf[32], DRV_VERSION, 4);
2277 
2278 	/* we don't store the ATA device signature, so we fake it */
2279 
2280 	tf.command = ATA_DRDY;		/* really, this is Status reg */
2281 	tf.lbal = 0x1;
2282 	tf.nsect = 0x1;
2283 
2284 	ata_tf_to_fis(&tf, 0, 1, &rbuf[36]);	/* TODO: PMP? */
2285 	rbuf[36] = 0x34;		/* force D2H Reg FIS (34h) */
2286 
2287 	rbuf[56] = ATA_CMD_ID_ATA;
2288 
2289 	memcpy(&rbuf[60], &args->id[0], 512);
2290 	return 0;
2291 }
2292 
2293 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
2294 {
2295 	u16 min_io_sectors;
2296 
2297 	rbuf[1] = 0xb0;
2298 	rbuf[3] = 0x3c;		/* required VPD size with unmap support */
2299 
2300 	/*
2301 	 * Optimal transfer length granularity.
2302 	 *
2303 	 * This is always one physical block, but for disks with a smaller
2304 	 * logical than physical sector size we need to figure out what the
2305 	 * latter is.
2306 	 */
2307 	min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
2308 	put_unaligned_be16(min_io_sectors, &rbuf[6]);
2309 
2310 	/*
2311 	 * Optimal unmap granularity.
2312 	 *
2313 	 * The ATA spec doesn't even know about a granularity or alignment
2314 	 * for the TRIM command.  We can leave away most of the unmap related
2315 	 * VPD page entries, but we have specifify a granularity to signal
2316 	 * that we support some form of unmap - in thise case via WRITE SAME
2317 	 * with the unmap bit set.
2318 	 */
2319 	if (ata_id_has_trim(args->id)) {
2320 		put_unaligned_be64(65535 * ATA_MAX_TRIM_RNUM, &rbuf[36]);
2321 		put_unaligned_be32(1, &rbuf[28]);
2322 	}
2323 
2324 	return 0;
2325 }
2326 
2327 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2328 {
2329 	int form_factor = ata_id_form_factor(args->id);
2330 	int media_rotation_rate = ata_id_rotation_rate(args->id);
2331 	u8 zoned = ata_id_zoned_cap(args->id);
2332 
2333 	rbuf[1] = 0xb1;
2334 	rbuf[3] = 0x3c;
2335 	rbuf[4] = media_rotation_rate >> 8;
2336 	rbuf[5] = media_rotation_rate;
2337 	rbuf[7] = form_factor;
2338 	if (zoned)
2339 		rbuf[8] = (zoned << 4);
2340 
2341 	return 0;
2342 }
2343 
2344 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
2345 {
2346 	/* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2347 	rbuf[1] = 0xb2;
2348 	rbuf[3] = 0x4;
2349 	rbuf[5] = 1 << 6;	/* TPWS */
2350 
2351 	return 0;
2352 }
2353 
2354 static unsigned int ata_scsiop_inq_b6(struct ata_scsi_args *args, u8 *rbuf)
2355 {
2356 	/*
2357 	 * zbc-r05 SCSI Zoned Block device characteristics VPD page
2358 	 */
2359 	rbuf[1] = 0xb6;
2360 	rbuf[3] = 0x3C;
2361 
2362 	/*
2363 	 * URSWRZ bit is only meaningful for host-managed ZAC drives
2364 	 */
2365 	if (args->dev->zac_zoned_cap & 1)
2366 		rbuf[4] |= 1;
2367 	put_unaligned_be32(args->dev->zac_zones_optimal_open, &rbuf[8]);
2368 	put_unaligned_be32(args->dev->zac_zones_optimal_nonseq, &rbuf[12]);
2369 	put_unaligned_be32(args->dev->zac_zones_max_open, &rbuf[16]);
2370 
2371 	return 0;
2372 }
2373 
2374 /**
2375  *	ata_scsiop_noop - Command handler that simply returns success.
2376  *	@args: device IDENTIFY data / SCSI command of interest.
2377  *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2378  *
2379  *	No operation.  Simply returns success to caller, to indicate
2380  *	that the caller should successfully complete this SCSI command.
2381  *
2382  *	LOCKING:
2383  *	spin_lock_irqsave(host lock)
2384  */
2385 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
2386 {
2387 	VPRINTK("ENTER\n");
2388 	return 0;
2389 }
2390 
2391 /**
2392  *	modecpy - Prepare response for MODE SENSE
2393  *	@dest: output buffer
2394  *	@src: data being copied
2395  *	@n: length of mode page
2396  *	@changeable: whether changeable parameters are requested
2397  *
2398  *	Generate a generic MODE SENSE page for either current or changeable
2399  *	parameters.
2400  *
2401  *	LOCKING:
2402  *	None.
2403  */
2404 static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
2405 {
2406 	if (changeable) {
2407 		memcpy(dest, src, 2);
2408 		memset(dest + 2, 0, n - 2);
2409 	} else {
2410 		memcpy(dest, src, n);
2411 	}
2412 }
2413 
2414 /**
2415  *	ata_msense_caching - Simulate MODE SENSE caching info page
2416  *	@id: device IDENTIFY data
2417  *	@buf: output buffer
2418  *	@changeable: whether changeable parameters are requested
2419  *
2420  *	Generate a caching info page, which conditionally indicates
2421  *	write caching to the SCSI layer, depending on device
2422  *	capabilities.
2423  *
2424  *	LOCKING:
2425  *	None.
2426  */
2427 static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
2428 {
2429 	modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
2430 	if (changeable) {
2431 		buf[2] |= (1 << 2);	/* ata_mselect_caching() */
2432 	} else {
2433 		buf[2] |= (ata_id_wcache_enabled(id) << 2);	/* write cache enable */
2434 		buf[12] |= (!ata_id_rahead_enabled(id) << 5);	/* disable read ahead */
2435 	}
2436 	return sizeof(def_cache_mpage);
2437 }
2438 
2439 /**
2440  *	ata_msense_control - Simulate MODE SENSE control mode page
2441  *	@dev: ATA device of interest
2442  *	@buf: output buffer
2443  *	@changeable: whether changeable parameters are requested
2444  *
2445  *	Generate a generic MODE SENSE control mode page.
2446  *
2447  *	LOCKING:
2448  *	None.
2449  */
2450 static unsigned int ata_msense_control(struct ata_device *dev, u8 *buf,
2451 					bool changeable)
2452 {
2453 	modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable);
2454 	if (changeable) {
2455 		buf[2] |= (1 << 2);	/* ata_mselect_control() */
2456 	} else {
2457 		bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE);
2458 
2459 		buf[2] |= (d_sense << 2);	/* descriptor format sense data */
2460 	}
2461 	return sizeof(def_control_mpage);
2462 }
2463 
2464 /**
2465  *	ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2466  *	@buf: output buffer
2467  *	@changeable: whether changeable parameters are requested
2468  *
2469  *	Generate a generic MODE SENSE r/w error recovery page.
2470  *
2471  *	LOCKING:
2472  *	None.
2473  */
2474 static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable)
2475 {
2476 	modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage),
2477 		changeable);
2478 	return sizeof(def_rw_recovery_mpage);
2479 }
2480 
2481 /*
2482  * We can turn this into a real blacklist if it's needed, for now just
2483  * blacklist any Maxtor BANC1G10 revision firmware
2484  */
2485 static int ata_dev_supports_fua(u16 *id)
2486 {
2487 	unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2488 
2489 	if (!libata_fua)
2490 		return 0;
2491 	if (!ata_id_has_fua(id))
2492 		return 0;
2493 
2494 	ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2495 	ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2496 
2497 	if (strcmp(model, "Maxtor"))
2498 		return 1;
2499 	if (strcmp(fw, "BANC1G10"))
2500 		return 1;
2501 
2502 	return 0; /* blacklisted */
2503 }
2504 
2505 /**
2506  *	ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2507  *	@args: device IDENTIFY data / SCSI command of interest.
2508  *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2509  *
2510  *	Simulate MODE SENSE commands. Assume this is invoked for direct
2511  *	access devices (e.g. disks) only. There should be no block
2512  *	descriptor for other device types.
2513  *
2514  *	LOCKING:
2515  *	spin_lock_irqsave(host lock)
2516  */
2517 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
2518 {
2519 	struct ata_device *dev = args->dev;
2520 	u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
2521 	const u8 sat_blk_desc[] = {
2522 		0, 0, 0, 0,	/* number of blocks: sat unspecified */
2523 		0,
2524 		0, 0x2, 0x0	/* block length: 512 bytes */
2525 	};
2526 	u8 pg, spg;
2527 	unsigned int ebd, page_control, six_byte;
2528 	u8 dpofua, bp = 0xff;
2529 	u16 fp;
2530 
2531 	VPRINTK("ENTER\n");
2532 
2533 	six_byte = (scsicmd[0] == MODE_SENSE);
2534 	ebd = !(scsicmd[1] & 0x8);      /* dbd bit inverted == edb */
2535 	/*
2536 	 * LLBA bit in msense(10) ignored (compliant)
2537 	 */
2538 
2539 	page_control = scsicmd[2] >> 6;
2540 	switch (page_control) {
2541 	case 0: /* current */
2542 	case 1: /* changeable */
2543 	case 2: /* defaults */
2544 		break;  /* supported */
2545 	case 3: /* saved */
2546 		goto saving_not_supp;
2547 	default:
2548 		fp = 2;
2549 		bp = 6;
2550 		goto invalid_fld;
2551 	}
2552 
2553 	if (six_byte)
2554 		p += 4 + (ebd ? 8 : 0);
2555 	else
2556 		p += 8 + (ebd ? 8 : 0);
2557 
2558 	pg = scsicmd[2] & 0x3f;
2559 	spg = scsicmd[3];
2560 	/*
2561 	 * No mode subpages supported (yet) but asking for _all_
2562 	 * subpages may be valid
2563 	 */
2564 	if (spg && (spg != ALL_SUB_MPAGES)) {
2565 		fp = 3;
2566 		goto invalid_fld;
2567 	}
2568 
2569 	switch(pg) {
2570 	case RW_RECOVERY_MPAGE:
2571 		p += ata_msense_rw_recovery(p, page_control == 1);
2572 		break;
2573 
2574 	case CACHE_MPAGE:
2575 		p += ata_msense_caching(args->id, p, page_control == 1);
2576 		break;
2577 
2578 	case CONTROL_MPAGE:
2579 		p += ata_msense_control(args->dev, p, page_control == 1);
2580 		break;
2581 
2582 	case ALL_MPAGES:
2583 		p += ata_msense_rw_recovery(p, page_control == 1);
2584 		p += ata_msense_caching(args->id, p, page_control == 1);
2585 		p += ata_msense_control(args->dev, p, page_control == 1);
2586 		break;
2587 
2588 	default:		/* invalid page code */
2589 		fp = 2;
2590 		goto invalid_fld;
2591 	}
2592 
2593 	dpofua = 0;
2594 	if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2595 	    (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2596 		dpofua = 1 << 4;
2597 
2598 	if (six_byte) {
2599 		rbuf[0] = p - rbuf - 1;
2600 		rbuf[2] |= dpofua;
2601 		if (ebd) {
2602 			rbuf[3] = sizeof(sat_blk_desc);
2603 			memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2604 		}
2605 	} else {
2606 		unsigned int output_len = p - rbuf - 2;
2607 
2608 		rbuf[0] = output_len >> 8;
2609 		rbuf[1] = output_len;
2610 		rbuf[3] |= dpofua;
2611 		if (ebd) {
2612 			rbuf[7] = sizeof(sat_blk_desc);
2613 			memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2614 		}
2615 	}
2616 	return 0;
2617 
2618 invalid_fld:
2619 	ata_scsi_set_invalid_field(dev, args->cmd, fp, bp);
2620 	return 1;
2621 
2622 saving_not_supp:
2623 	ata_scsi_set_sense(dev, args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2624 	 /* "Saving parameters not supported" */
2625 	return 1;
2626 }
2627 
2628 /**
2629  *	ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2630  *	@args: device IDENTIFY data / SCSI command of interest.
2631  *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2632  *
2633  *	Simulate READ CAPACITY commands.
2634  *
2635  *	LOCKING:
2636  *	None.
2637  */
2638 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
2639 {
2640 	struct ata_device *dev = args->dev;
2641 	u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
2642 	u32 sector_size; /* physical sector size in bytes */
2643 	u8 log2_per_phys;
2644 	u16 lowest_aligned;
2645 
2646 	sector_size = ata_id_logical_sector_size(dev->id);
2647 	log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2648 	lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
2649 
2650 	VPRINTK("ENTER\n");
2651 
2652 	if (args->cmd->cmnd[0] == READ_CAPACITY) {
2653 		if (last_lba >= 0xffffffffULL)
2654 			last_lba = 0xffffffff;
2655 
2656 		/* sector count, 32-bit */
2657 		rbuf[0] = last_lba >> (8 * 3);
2658 		rbuf[1] = last_lba >> (8 * 2);
2659 		rbuf[2] = last_lba >> (8 * 1);
2660 		rbuf[3] = last_lba;
2661 
2662 		/* sector size */
2663 		rbuf[4] = sector_size >> (8 * 3);
2664 		rbuf[5] = sector_size >> (8 * 2);
2665 		rbuf[6] = sector_size >> (8 * 1);
2666 		rbuf[7] = sector_size;
2667 	} else {
2668 		/* sector count, 64-bit */
2669 		rbuf[0] = last_lba >> (8 * 7);
2670 		rbuf[1] = last_lba >> (8 * 6);
2671 		rbuf[2] = last_lba >> (8 * 5);
2672 		rbuf[3] = last_lba >> (8 * 4);
2673 		rbuf[4] = last_lba >> (8 * 3);
2674 		rbuf[5] = last_lba >> (8 * 2);
2675 		rbuf[6] = last_lba >> (8 * 1);
2676 		rbuf[7] = last_lba;
2677 
2678 		/* sector size */
2679 		rbuf[ 8] = sector_size >> (8 * 3);
2680 		rbuf[ 9] = sector_size >> (8 * 2);
2681 		rbuf[10] = sector_size >> (8 * 1);
2682 		rbuf[11] = sector_size;
2683 
2684 		rbuf[12] = 0;
2685 		rbuf[13] = log2_per_phys;
2686 		rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2687 		rbuf[15] = lowest_aligned;
2688 
2689 		if (ata_id_has_trim(args->id) &&
2690 		    !(dev->horkage & ATA_HORKAGE_NOTRIM)) {
2691 			rbuf[14] |= 0x80; /* LBPME */
2692 
2693 			if (ata_id_has_zero_after_trim(args->id) &&
2694 			    dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) {
2695 				ata_dev_info(dev, "Enabling discard_zeroes_data\n");
2696 				rbuf[14] |= 0x40; /* LBPRZ */
2697 			}
2698 		}
2699 		if (ata_id_zoned_cap(args->id) ||
2700 		    args->dev->class == ATA_DEV_ZAC)
2701 			rbuf[12] = (1 << 4); /* RC_BASIS */
2702 	}
2703 	return 0;
2704 }
2705 
2706 /**
2707  *	ata_scsiop_report_luns - Simulate REPORT LUNS command
2708  *	@args: device IDENTIFY data / SCSI command of interest.
2709  *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2710  *
2711  *	Simulate REPORT LUNS command.
2712  *
2713  *	LOCKING:
2714  *	spin_lock_irqsave(host lock)
2715  */
2716 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
2717 {
2718 	VPRINTK("ENTER\n");
2719 	rbuf[3] = 8;	/* just one lun, LUN 0, size 8 bytes */
2720 
2721 	return 0;
2722 }
2723 
2724 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2725 {
2726 	if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2727 		/* FIXME: not quite right; we don't want the
2728 		 * translation of taskfile registers into
2729 		 * a sense descriptors, since that's only
2730 		 * correct for ATA, not ATAPI
2731 		 */
2732 		ata_gen_passthru_sense(qc);
2733 	}
2734 
2735 	ata_qc_done(qc);
2736 }
2737 
2738 /* is it pointless to prefer PIO for "safety reasons"? */
2739 static inline int ata_pio_use_silly(struct ata_port *ap)
2740 {
2741 	return (ap->flags & ATA_FLAG_PIO_DMA);
2742 }
2743 
2744 static void atapi_request_sense(struct ata_queued_cmd *qc)
2745 {
2746 	struct ata_port *ap = qc->ap;
2747 	struct scsi_cmnd *cmd = qc->scsicmd;
2748 
2749 	DPRINTK("ATAPI request sense\n");
2750 
2751 	memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2752 
2753 #ifdef CONFIG_ATA_SFF
2754 	if (ap->ops->sff_tf_read)
2755 		ap->ops->sff_tf_read(ap, &qc->tf);
2756 #endif
2757 
2758 	/* fill these in, for the case where they are -not- overwritten */
2759 	cmd->sense_buffer[0] = 0x70;
2760 	cmd->sense_buffer[2] = qc->tf.feature >> 4;
2761 
2762 	ata_qc_reinit(qc);
2763 
2764 	/* setup sg table and init transfer direction */
2765 	sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2766 	ata_sg_init(qc, &qc->sgent, 1);
2767 	qc->dma_dir = DMA_FROM_DEVICE;
2768 
2769 	memset(&qc->cdb, 0, qc->dev->cdb_len);
2770 	qc->cdb[0] = REQUEST_SENSE;
2771 	qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2772 
2773 	qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2774 	qc->tf.command = ATA_CMD_PACKET;
2775 
2776 	if (ata_pio_use_silly(ap)) {
2777 		qc->tf.protocol = ATAPI_PROT_DMA;
2778 		qc->tf.feature |= ATAPI_PKT_DMA;
2779 	} else {
2780 		qc->tf.protocol = ATAPI_PROT_PIO;
2781 		qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2782 		qc->tf.lbah = 0;
2783 	}
2784 	qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2785 
2786 	qc->complete_fn = atapi_sense_complete;
2787 
2788 	ata_qc_issue(qc);
2789 
2790 	DPRINTK("EXIT\n");
2791 }
2792 
2793 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2794 {
2795 	struct scsi_cmnd *cmd = qc->scsicmd;
2796 	unsigned int err_mask = qc->err_mask;
2797 
2798 	VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2799 
2800 	/* handle completion from new EH */
2801 	if (unlikely(qc->ap->ops->error_handler &&
2802 		     (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2803 
2804 		if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2805 			/* FIXME: not quite right; we don't want the
2806 			 * translation of taskfile registers into a
2807 			 * sense descriptors, since that's only
2808 			 * correct for ATA, not ATAPI
2809 			 */
2810 			ata_gen_passthru_sense(qc);
2811 		}
2812 
2813 		/* SCSI EH automatically locks door if sdev->locked is
2814 		 * set.  Sometimes door lock request continues to
2815 		 * fail, for example, when no media is present.  This
2816 		 * creates a loop - SCSI EH issues door lock which
2817 		 * fails and gets invoked again to acquire sense data
2818 		 * for the failed command.
2819 		 *
2820 		 * If door lock fails, always clear sdev->locked to
2821 		 * avoid this infinite loop.
2822 		 *
2823 		 * This may happen before SCSI scan is complete.  Make
2824 		 * sure qc->dev->sdev isn't NULL before dereferencing.
2825 		 */
2826 		if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
2827 			qc->dev->sdev->locked = 0;
2828 
2829 		qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2830 		ata_qc_done(qc);
2831 		return;
2832 	}
2833 
2834 	/* successful completion or old EH failure path */
2835 	if (unlikely(err_mask & AC_ERR_DEV)) {
2836 		cmd->result = SAM_STAT_CHECK_CONDITION;
2837 		atapi_request_sense(qc);
2838 		return;
2839 	} else if (unlikely(err_mask)) {
2840 		/* FIXME: not quite right; we don't want the
2841 		 * translation of taskfile registers into
2842 		 * a sense descriptors, since that's only
2843 		 * correct for ATA, not ATAPI
2844 		 */
2845 		ata_gen_passthru_sense(qc);
2846 	} else {
2847 		u8 *scsicmd = cmd->cmnd;
2848 
2849 		if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2850 			unsigned long flags;
2851 			u8 *buf;
2852 
2853 			buf = ata_scsi_rbuf_get(cmd, true, &flags);
2854 
2855 	/* ATAPI devices typically report zero for their SCSI version,
2856 	 * and sometimes deviate from the spec WRT response data
2857 	 * format.  If SCSI version is reported as zero like normal,
2858 	 * then we make the following fixups:  1) Fake MMC-5 version,
2859 	 * to indicate to the Linux scsi midlayer this is a modern
2860 	 * device.  2) Ensure response data format / ATAPI information
2861 	 * are always correct.
2862 	 */
2863 			if (buf[2] == 0) {
2864 				buf[2] = 0x5;
2865 				buf[3] = 0x32;
2866 			}
2867 
2868 			ata_scsi_rbuf_put(cmd, true, &flags);
2869 		}
2870 
2871 		cmd->result = SAM_STAT_GOOD;
2872 	}
2873 
2874 	ata_qc_done(qc);
2875 }
2876 /**
2877  *	atapi_xlat - Initialize PACKET taskfile
2878  *	@qc: command structure to be initialized
2879  *
2880  *	LOCKING:
2881  *	spin_lock_irqsave(host lock)
2882  *
2883  *	RETURNS:
2884  *	Zero on success, non-zero on failure.
2885  */
2886 static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2887 {
2888 	struct scsi_cmnd *scmd = qc->scsicmd;
2889 	struct ata_device *dev = qc->dev;
2890 	int nodata = (scmd->sc_data_direction == DMA_NONE);
2891 	int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2892 	unsigned int nbytes;
2893 
2894 	memset(qc->cdb, 0, dev->cdb_len);
2895 	memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2896 
2897 	qc->complete_fn = atapi_qc_complete;
2898 
2899 	qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2900 	if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2901 		qc->tf.flags |= ATA_TFLAG_WRITE;
2902 		DPRINTK("direction: write\n");
2903 	}
2904 
2905 	qc->tf.command = ATA_CMD_PACKET;
2906 	ata_qc_set_pc_nbytes(qc);
2907 
2908 	/* check whether ATAPI DMA is safe */
2909 	if (!nodata && !using_pio && atapi_check_dma(qc))
2910 		using_pio = 1;
2911 
2912 	/* Some controller variants snoop this value for Packet
2913 	 * transfers to do state machine and FIFO management.  Thus we
2914 	 * want to set it properly, and for DMA where it is
2915 	 * effectively meaningless.
2916 	 */
2917 	nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2918 
2919 	/* Most ATAPI devices which honor transfer chunk size don't
2920 	 * behave according to the spec when odd chunk size which
2921 	 * matches the transfer length is specified.  If the number of
2922 	 * bytes to transfer is 2n+1.  According to the spec, what
2923 	 * should happen is to indicate that 2n+1 is going to be
2924 	 * transferred and transfer 2n+2 bytes where the last byte is
2925 	 * padding.
2926 	 *
2927 	 * In practice, this doesn't happen.  ATAPI devices first
2928 	 * indicate and transfer 2n bytes and then indicate and
2929 	 * transfer 2 bytes where the last byte is padding.
2930 	 *
2931 	 * This inconsistency confuses several controllers which
2932 	 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2933 	 * These controllers use actual number of transferred bytes to
2934 	 * update DMA poitner and transfer of 4n+2 bytes make those
2935 	 * controller push DMA pointer by 4n+4 bytes because SATA data
2936 	 * FISes are aligned to 4 bytes.  This causes data corruption
2937 	 * and buffer overrun.
2938 	 *
2939 	 * Always setting nbytes to even number solves this problem
2940 	 * because then ATAPI devices don't have to split data at 2n
2941 	 * boundaries.
2942 	 */
2943 	if (nbytes & 0x1)
2944 		nbytes++;
2945 
2946 	qc->tf.lbam = (nbytes & 0xFF);
2947 	qc->tf.lbah = (nbytes >> 8);
2948 
2949 	if (nodata)
2950 		qc->tf.protocol = ATAPI_PROT_NODATA;
2951 	else if (using_pio)
2952 		qc->tf.protocol = ATAPI_PROT_PIO;
2953 	else {
2954 		/* DMA data xfer */
2955 		qc->tf.protocol = ATAPI_PROT_DMA;
2956 		qc->tf.feature |= ATAPI_PKT_DMA;
2957 
2958 		if ((dev->flags & ATA_DFLAG_DMADIR) &&
2959 		    (scmd->sc_data_direction != DMA_TO_DEVICE))
2960 			/* some SATA bridges need us to indicate data xfer direction */
2961 			qc->tf.feature |= ATAPI_DMADIR;
2962 	}
2963 
2964 
2965 	/* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2966 	   as ATAPI tape drives don't get this right otherwise */
2967 	return 0;
2968 }
2969 
2970 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2971 {
2972 	if (!sata_pmp_attached(ap)) {
2973 		if (likely(devno < ata_link_max_devices(&ap->link)))
2974 			return &ap->link.device[devno];
2975 	} else {
2976 		if (likely(devno < ap->nr_pmp_links))
2977 			return &ap->pmp_link[devno].device[0];
2978 	}
2979 
2980 	return NULL;
2981 }
2982 
2983 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2984 					      const struct scsi_device *scsidev)
2985 {
2986 	int devno;
2987 
2988 	/* skip commands not addressed to targets we simulate */
2989 	if (!sata_pmp_attached(ap)) {
2990 		if (unlikely(scsidev->channel || scsidev->lun))
2991 			return NULL;
2992 		devno = scsidev->id;
2993 	} else {
2994 		if (unlikely(scsidev->id || scsidev->lun))
2995 			return NULL;
2996 		devno = scsidev->channel;
2997 	}
2998 
2999 	return ata_find_dev(ap, devno);
3000 }
3001 
3002 /**
3003  *	ata_scsi_find_dev - lookup ata_device from scsi_cmnd
3004  *	@ap: ATA port to which the device is attached
3005  *	@scsidev: SCSI device from which we derive the ATA device
3006  *
3007  *	Given various information provided in struct scsi_cmnd,
3008  *	map that onto an ATA bus, and using that mapping
3009  *	determine which ata_device is associated with the
3010  *	SCSI command to be sent.
3011  *
3012  *	LOCKING:
3013  *	spin_lock_irqsave(host lock)
3014  *
3015  *	RETURNS:
3016  *	Associated ATA device, or %NULL if not found.
3017  */
3018 static struct ata_device *
3019 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
3020 {
3021 	struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
3022 
3023 	if (unlikely(!dev || !ata_dev_enabled(dev)))
3024 		return NULL;
3025 
3026 	return dev;
3027 }
3028 
3029 /*
3030  *	ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
3031  *	@byte1: Byte 1 from pass-thru CDB.
3032  *
3033  *	RETURNS:
3034  *	ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
3035  */
3036 static u8
3037 ata_scsi_map_proto(u8 byte1)
3038 {
3039 	switch((byte1 & 0x1e) >> 1) {
3040 	case 3:		/* Non-data */
3041 		return ATA_PROT_NODATA;
3042 
3043 	case 6:		/* DMA */
3044 	case 10:	/* UDMA Data-in */
3045 	case 11:	/* UDMA Data-Out */
3046 		return ATA_PROT_DMA;
3047 
3048 	case 4:		/* PIO Data-in */
3049 	case 5:		/* PIO Data-out */
3050 		return ATA_PROT_PIO;
3051 
3052 	case 12:	/* FPDMA */
3053 		return ATA_PROT_NCQ;
3054 
3055 	case 0:		/* Hard Reset */
3056 	case 1:		/* SRST */
3057 	case 8:		/* Device Diagnostic */
3058 	case 9:		/* Device Reset */
3059 	case 7:		/* DMA Queued */
3060 	case 15:	/* Return Response Info */
3061 	default:	/* Reserved */
3062 		break;
3063 	}
3064 
3065 	return ATA_PROT_UNKNOWN;
3066 }
3067 
3068 /**
3069  *	ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
3070  *	@qc: command structure to be initialized
3071  *
3072  *	Handles either 12 or 16-byte versions of the CDB.
3073  *
3074  *	RETURNS:
3075  *	Zero on success, non-zero on failure.
3076  */
3077 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
3078 {
3079 	struct ata_taskfile *tf = &(qc->tf);
3080 	struct scsi_cmnd *scmd = qc->scsicmd;
3081 	struct ata_device *dev = qc->dev;
3082 	const u8 *cdb = scmd->cmnd;
3083 	u16 fp;
3084 
3085 	if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) {
3086 		fp = 1;
3087 		goto invalid_fld;
3088 	}
3089 
3090 	if (ata_is_ncq(tf->protocol) && (cdb[2] & 0x3) == 0)
3091 		tf->protocol = ATA_PROT_NCQ_NODATA;
3092 
3093 	/* enable LBA */
3094 	tf->flags |= ATA_TFLAG_LBA;
3095 
3096 	/*
3097 	 * 12 and 16 byte CDBs use different offsets to
3098 	 * provide the various register values.
3099 	 */
3100 	if (cdb[0] == ATA_16) {
3101 		/*
3102 		 * 16-byte CDB - may contain extended commands.
3103 		 *
3104 		 * If that is the case, copy the upper byte register values.
3105 		 */
3106 		if (cdb[1] & 0x01) {
3107 			tf->hob_feature = cdb[3];
3108 			tf->hob_nsect = cdb[5];
3109 			tf->hob_lbal = cdb[7];
3110 			tf->hob_lbam = cdb[9];
3111 			tf->hob_lbah = cdb[11];
3112 			tf->flags |= ATA_TFLAG_LBA48;
3113 		} else
3114 			tf->flags &= ~ATA_TFLAG_LBA48;
3115 
3116 		/*
3117 		 * Always copy low byte, device and command registers.
3118 		 */
3119 		tf->feature = cdb[4];
3120 		tf->nsect = cdb[6];
3121 		tf->lbal = cdb[8];
3122 		tf->lbam = cdb[10];
3123 		tf->lbah = cdb[12];
3124 		tf->device = cdb[13];
3125 		tf->command = cdb[14];
3126 	} else {
3127 		/*
3128 		 * 12-byte CDB - incapable of extended commands.
3129 		 */
3130 		tf->flags &= ~ATA_TFLAG_LBA48;
3131 
3132 		tf->feature = cdb[3];
3133 		tf->nsect = cdb[4];
3134 		tf->lbal = cdb[5];
3135 		tf->lbam = cdb[6];
3136 		tf->lbah = cdb[7];
3137 		tf->device = cdb[8];
3138 		tf->command = cdb[9];
3139 	}
3140 
3141 	/* For NCQ commands copy the tag value */
3142 	if (ata_is_ncq(tf->protocol))
3143 		tf->nsect = qc->tag << 3;
3144 
3145 	/* enforce correct master/slave bit */
3146 	tf->device = dev->devno ?
3147 		tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
3148 
3149 	switch (tf->command) {
3150 	/* READ/WRITE LONG use a non-standard sect_size */
3151 	case ATA_CMD_READ_LONG:
3152 	case ATA_CMD_READ_LONG_ONCE:
3153 	case ATA_CMD_WRITE_LONG:
3154 	case ATA_CMD_WRITE_LONG_ONCE:
3155 		if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) {
3156 			fp = 1;
3157 			goto invalid_fld;
3158 		}
3159 		qc->sect_size = scsi_bufflen(scmd);
3160 		break;
3161 
3162 	/* commands using reported Logical Block size (e.g. 512 or 4K) */
3163 	case ATA_CMD_CFA_WRITE_NE:
3164 	case ATA_CMD_CFA_TRANS_SECT:
3165 	case ATA_CMD_CFA_WRITE_MULT_NE:
3166 	/* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
3167 	case ATA_CMD_READ:
3168 	case ATA_CMD_READ_EXT:
3169 	case ATA_CMD_READ_QUEUED:
3170 	/* XXX: case ATA_CMD_READ_QUEUED_EXT: */
3171 	case ATA_CMD_FPDMA_READ:
3172 	case ATA_CMD_READ_MULTI:
3173 	case ATA_CMD_READ_MULTI_EXT:
3174 	case ATA_CMD_PIO_READ:
3175 	case ATA_CMD_PIO_READ_EXT:
3176 	case ATA_CMD_READ_STREAM_DMA_EXT:
3177 	case ATA_CMD_READ_STREAM_EXT:
3178 	case ATA_CMD_VERIFY:
3179 	case ATA_CMD_VERIFY_EXT:
3180 	case ATA_CMD_WRITE:
3181 	case ATA_CMD_WRITE_EXT:
3182 	case ATA_CMD_WRITE_FUA_EXT:
3183 	case ATA_CMD_WRITE_QUEUED:
3184 	case ATA_CMD_WRITE_QUEUED_FUA_EXT:
3185 	case ATA_CMD_FPDMA_WRITE:
3186 	case ATA_CMD_WRITE_MULTI:
3187 	case ATA_CMD_WRITE_MULTI_EXT:
3188 	case ATA_CMD_WRITE_MULTI_FUA_EXT:
3189 	case ATA_CMD_PIO_WRITE:
3190 	case ATA_CMD_PIO_WRITE_EXT:
3191 	case ATA_CMD_WRITE_STREAM_DMA_EXT:
3192 	case ATA_CMD_WRITE_STREAM_EXT:
3193 		qc->sect_size = scmd->device->sector_size;
3194 		break;
3195 
3196 	/* Everything else uses 512 byte "sectors" */
3197 	default:
3198 		qc->sect_size = ATA_SECT_SIZE;
3199 	}
3200 
3201 	/*
3202 	 * Set flags so that all registers will be written, pass on
3203 	 * write indication (used for PIO/DMA setup), result TF is
3204 	 * copied back and we don't whine too much about its failure.
3205 	 */
3206 	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3207 	if (scmd->sc_data_direction == DMA_TO_DEVICE)
3208 		tf->flags |= ATA_TFLAG_WRITE;
3209 
3210 	qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
3211 
3212 	/*
3213 	 * Set transfer length.
3214 	 *
3215 	 * TODO: find out if we need to do more here to
3216 	 *       cover scatter/gather case.
3217 	 */
3218 	ata_qc_set_pc_nbytes(qc);
3219 
3220 	/* We may not issue DMA commands if no DMA mode is set */
3221 	if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) {
3222 		fp = 1;
3223 		goto invalid_fld;
3224 	}
3225 
3226 	/* sanity check for pio multi commands */
3227 	if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) {
3228 		fp = 1;
3229 		goto invalid_fld;
3230 	}
3231 
3232 	if (is_multi_taskfile(tf)) {
3233 		unsigned int multi_count = 1 << (cdb[1] >> 5);
3234 
3235 		/* compare the passed through multi_count
3236 		 * with the cached multi_count of libata
3237 		 */
3238 		if (multi_count != dev->multi_count)
3239 			ata_dev_warn(dev, "invalid multi_count %u ignored\n",
3240 				     multi_count);
3241 	}
3242 
3243 	/*
3244 	 * Filter SET_FEATURES - XFER MODE command -- otherwise,
3245 	 * SET_FEATURES - XFER MODE must be preceded/succeeded
3246 	 * by an update to hardware-specific registers for each
3247 	 * controller (i.e. the reason for ->set_piomode(),
3248 	 * ->set_dmamode(), and ->post_set_mode() hooks).
3249 	 */
3250 	if (tf->command == ATA_CMD_SET_FEATURES &&
3251 	    tf->feature == SETFEATURES_XFER) {
3252 		fp = (cdb[0] == ATA_16) ? 4 : 3;
3253 		goto invalid_fld;
3254 	}
3255 
3256 	/*
3257 	 * Filter TPM commands by default. These provide an
3258 	 * essentially uncontrolled encrypted "back door" between
3259 	 * applications and the disk. Set libata.allow_tpm=1 if you
3260 	 * have a real reason for wanting to use them. This ensures
3261 	 * that installed software cannot easily mess stuff up without
3262 	 * user intent. DVR type users will probably ship with this enabled
3263 	 * for movie content management.
3264 	 *
3265 	 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3266 	 * for this and should do in future but that it is not sufficient as
3267 	 * DCS is an optional feature set. Thus we also do the software filter
3268 	 * so that we comply with the TC consortium stated goal that the user
3269 	 * can turn off TC features of their system.
3270 	 */
3271 	if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) {
3272 		fp = (cdb[0] == ATA_16) ? 14 : 9;
3273 		goto invalid_fld;
3274 	}
3275 
3276 	return 0;
3277 
3278  invalid_fld:
3279 	ata_scsi_set_invalid_field(dev, scmd, fp, 0xff);
3280 	return 1;
3281 }
3282 
3283 /**
3284  * ata_format_dsm_trim_descr() - SATL Write Same to DSM Trim
3285  * @cmd: SCSI command being translated
3286  * @trmax: Maximum number of entries that will fit in sector_size bytes.
3287  * @sector: Starting sector
3288  * @count: Total Range of request in logical sectors
3289  *
3290  * Rewrite the WRITE SAME descriptor to be a DSM TRIM little-endian formatted
3291  * descriptor.
3292  *
3293  * Upto 64 entries of the format:
3294  *   63:48 Range Length
3295  *   47:0  LBA
3296  *
3297  *  Range Length of 0 is ignored.
3298  *  LBA's should be sorted order and not overlap.
3299  *
3300  * NOTE: this is the same format as ADD LBA(S) TO NV CACHE PINNED SET
3301  *
3302  * Return: Number of bytes copied into sglist.
3303  */
3304 static size_t ata_format_dsm_trim_descr(struct scsi_cmnd *cmd, u32 trmax,
3305 					u64 sector, u32 count)
3306 {
3307 	struct scsi_device *sdp = cmd->device;
3308 	size_t len = sdp->sector_size;
3309 	size_t r;
3310 	__le64 *buf;
3311 	u32 i = 0;
3312 	unsigned long flags;
3313 
3314 	WARN_ON(len > ATA_SCSI_RBUF_SIZE);
3315 
3316 	if (len > ATA_SCSI_RBUF_SIZE)
3317 		len = ATA_SCSI_RBUF_SIZE;
3318 
3319 	spin_lock_irqsave(&ata_scsi_rbuf_lock, flags);
3320 	buf = ((void *)ata_scsi_rbuf);
3321 	memset(buf, 0, len);
3322 	while (i < trmax) {
3323 		u64 entry = sector |
3324 			((u64)(count > 0xffff ? 0xffff : count) << 48);
3325 		buf[i++] = __cpu_to_le64(entry);
3326 		if (count <= 0xffff)
3327 			break;
3328 		count -= 0xffff;
3329 		sector += 0xffff;
3330 	}
3331 	r = sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, len);
3332 	spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags);
3333 
3334 	return r;
3335 }
3336 
3337 /**
3338  * ata_format_dsm_trim_descr() - SATL Write Same to ATA SCT Write Same
3339  * @cmd: SCSI command being translated
3340  * @lba: Starting sector
3341  * @num: Number of sectors to be zero'd.
3342  *
3343  * Rewrite the WRITE SAME payload to be an SCT Write Same formatted
3344  * descriptor.
3345  * NOTE: Writes a pattern (0's) in the foreground.
3346  *
3347  * Return: Number of bytes copied into sglist.
3348  */
3349 static size_t ata_format_sct_write_same(struct scsi_cmnd *cmd, u64 lba, u64 num)
3350 {
3351 	struct scsi_device *sdp = cmd->device;
3352 	size_t len = sdp->sector_size;
3353 	size_t r;
3354 	u16 *buf;
3355 	unsigned long flags;
3356 
3357 	spin_lock_irqsave(&ata_scsi_rbuf_lock, flags);
3358 	buf = ((void *)ata_scsi_rbuf);
3359 
3360 	put_unaligned_le16(0x0002,  &buf[0]); /* SCT_ACT_WRITE_SAME */
3361 	put_unaligned_le16(0x0101,  &buf[1]); /* WRITE PTRN FG */
3362 	put_unaligned_le64(lba,     &buf[2]);
3363 	put_unaligned_le64(num,     &buf[6]);
3364 	put_unaligned_le32(0u,      &buf[10]); /* pattern */
3365 
3366 	WARN_ON(len > ATA_SCSI_RBUF_SIZE);
3367 
3368 	if (len > ATA_SCSI_RBUF_SIZE)
3369 		len = ATA_SCSI_RBUF_SIZE;
3370 
3371 	r = sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, len);
3372 	spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags);
3373 
3374 	return r;
3375 }
3376 
3377 /**
3378  * ata_scsi_write_same_xlat() - SATL Write Same to ATA SCT Write Same
3379  * @qc: Command to be translated
3380  *
3381  * Translate a SCSI WRITE SAME command to be either a DSM TRIM command or
3382  * an SCT Write Same command.
3383  * Based on WRITE SAME has the UNMAP flag
3384  *   When set translate to DSM TRIM
3385  *   When clear translate to SCT Write Same
3386  */
3387 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3388 {
3389 	struct ata_taskfile *tf = &qc->tf;
3390 	struct scsi_cmnd *scmd = qc->scsicmd;
3391 	struct scsi_device *sdp = scmd->device;
3392 	size_t len = sdp->sector_size;
3393 	struct ata_device *dev = qc->dev;
3394 	const u8 *cdb = scmd->cmnd;
3395 	u64 block;
3396 	u32 n_block;
3397 	const u32 trmax = len >> 3;
3398 	u32 size;
3399 	u16 fp;
3400 	u8 bp = 0xff;
3401 	u8 unmap = cdb[1] & 0x8;
3402 
3403 	/* we may not issue DMA commands if no DMA mode is set */
3404 	if (unlikely(!dev->dma_mode))
3405 		goto invalid_opcode;
3406 
3407 	if (unlikely(scmd->cmd_len < 16)) {
3408 		fp = 15;
3409 		goto invalid_fld;
3410 	}
3411 	scsi_16_lba_len(cdb, &block, &n_block);
3412 
3413 	if (unmap) {
3414 		/* If trim is not enabled the cmd is invalid. */
3415 		if ((dev->horkage & ATA_HORKAGE_NOTRIM) ||
3416 		    !ata_id_has_trim(dev->id)) {
3417 			fp = 1;
3418 			bp = 3;
3419 			goto invalid_fld;
3420 		}
3421 		/* If the request is too large the cmd is invalid */
3422 		if (n_block > 0xffff * trmax) {
3423 			fp = 2;
3424 			goto invalid_fld;
3425 		}
3426 	} else {
3427 		/* If write same is not available the cmd is invalid */
3428 		if (!ata_id_sct_write_same(dev->id)) {
3429 			fp = 1;
3430 			bp = 3;
3431 			goto invalid_fld;
3432 		}
3433 	}
3434 
3435 	/*
3436 	 * WRITE SAME always has a sector sized buffer as payload, this
3437 	 * should never be a multiple entry S/G list.
3438 	 */
3439 	if (!scsi_sg_count(scmd))
3440 		goto invalid_param_len;
3441 
3442 	/*
3443 	 * size must match sector size in bytes
3444 	 * For DATA SET MANAGEMENT TRIM in ACS-2 nsect (aka count)
3445 	 * is defined as number of 512 byte blocks to be transferred.
3446 	 */
3447 	if (unmap) {
3448 		size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block);
3449 		if (size != len)
3450 			goto invalid_param_len;
3451 
3452 		if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) {
3453 			/* Newer devices support queued TRIM commands */
3454 			tf->protocol = ATA_PROT_NCQ;
3455 			tf->command = ATA_CMD_FPDMA_SEND;
3456 			tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f;
3457 			tf->nsect = qc->tag << 3;
3458 			tf->hob_feature = (size / 512) >> 8;
3459 			tf->feature = size / 512;
3460 
3461 			tf->auxiliary = 1;
3462 		} else {
3463 			tf->protocol = ATA_PROT_DMA;
3464 			tf->hob_feature = 0;
3465 			tf->feature = ATA_DSM_TRIM;
3466 			tf->hob_nsect = (size / 512) >> 8;
3467 			tf->nsect = size / 512;
3468 			tf->command = ATA_CMD_DSM;
3469 		}
3470 	} else {
3471 		size = ata_format_sct_write_same(scmd, block, n_block);
3472 		if (size != len)
3473 			goto invalid_param_len;
3474 
3475 		tf->hob_feature = 0;
3476 		tf->feature = 0;
3477 		tf->hob_nsect = 0;
3478 		tf->nsect = 1;
3479 		tf->lbah = 0;
3480 		tf->lbam = 0;
3481 		tf->lbal = ATA_CMD_STANDBYNOW1;
3482 		tf->hob_lbah = 0;
3483 		tf->hob_lbam = 0;
3484 		tf->hob_lbal = 0;
3485 		tf->device = ATA_CMD_STANDBYNOW1;
3486 		tf->protocol = ATA_PROT_DMA;
3487 		tf->command = ATA_CMD_WRITE_LOG_DMA_EXT;
3488 		if (unlikely(dev->flags & ATA_DFLAG_PIO))
3489 			tf->command = ATA_CMD_WRITE_LOG_EXT;
3490 	}
3491 
3492 	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3493 		     ATA_TFLAG_WRITE;
3494 
3495 	ata_qc_set_pc_nbytes(qc);
3496 
3497 	return 0;
3498 
3499 invalid_fld:
3500 	ata_scsi_set_invalid_field(dev, scmd, fp, bp);
3501 	return 1;
3502 invalid_param_len:
3503 	/* "Parameter list length error" */
3504 	ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3505 	return 1;
3506 invalid_opcode:
3507 	/* "Invalid command operation code" */
3508 	ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x20, 0x0);
3509 	return 1;
3510 }
3511 
3512 /**
3513  *	ata_scsiop_maint_in - Simulate a subset of MAINTENANCE_IN
3514  *	@args: device MAINTENANCE_IN data / SCSI command of interest.
3515  *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
3516  *
3517  *	Yields a subset to satisfy scsi_report_opcode()
3518  *
3519  *	LOCKING:
3520  *	spin_lock_irqsave(host lock)
3521  */
3522 static unsigned int ata_scsiop_maint_in(struct ata_scsi_args *args, u8 *rbuf)
3523 {
3524 	struct ata_device *dev = args->dev;
3525 	u8 *cdb = args->cmd->cmnd;
3526 	u8 supported = 0;
3527 	unsigned int err = 0;
3528 
3529 	if (cdb[2] != 1) {
3530 		ata_dev_warn(dev, "invalid command format %d\n", cdb[2]);
3531 		err = 2;
3532 		goto out;
3533 	}
3534 	switch (cdb[3]) {
3535 	case INQUIRY:
3536 	case MODE_SENSE:
3537 	case MODE_SENSE_10:
3538 	case READ_CAPACITY:
3539 	case SERVICE_ACTION_IN_16:
3540 	case REPORT_LUNS:
3541 	case REQUEST_SENSE:
3542 	case SYNCHRONIZE_CACHE:
3543 	case REZERO_UNIT:
3544 	case SEEK_6:
3545 	case SEEK_10:
3546 	case TEST_UNIT_READY:
3547 	case SEND_DIAGNOSTIC:
3548 	case MAINTENANCE_IN:
3549 	case READ_6:
3550 	case READ_10:
3551 	case READ_16:
3552 	case WRITE_6:
3553 	case WRITE_10:
3554 	case WRITE_16:
3555 	case ATA_12:
3556 	case ATA_16:
3557 	case VERIFY:
3558 	case VERIFY_16:
3559 	case MODE_SELECT:
3560 	case MODE_SELECT_10:
3561 	case START_STOP:
3562 		supported = 3;
3563 		break;
3564 	case WRITE_SAME_16:
3565 		if (!ata_id_sct_write_same(dev->id))
3566 			break;
3567 		/* fallthrough: if SCT ... only enable for ZBC */
3568 	case ZBC_IN:
3569 	case ZBC_OUT:
3570 		if (ata_id_zoned_cap(dev->id) ||
3571 		    dev->class == ATA_DEV_ZAC)
3572 			supported = 3;
3573 		break;
3574 	default:
3575 		break;
3576 	}
3577 out:
3578 	rbuf[1] = supported; /* supported */
3579 	return err;
3580 }
3581 
3582 /**
3583  *	ata_scsi_report_zones_complete - convert ATA output
3584  *	@qc: command structure returning the data
3585  *
3586  *	Convert T-13 little-endian field representation into
3587  *	T-10 big-endian field representation.
3588  *	What a mess.
3589  */
3590 static void ata_scsi_report_zones_complete(struct ata_queued_cmd *qc)
3591 {
3592 	struct scsi_cmnd *scmd = qc->scsicmd;
3593 	struct sg_mapping_iter miter;
3594 	unsigned long flags;
3595 	unsigned int bytes = 0;
3596 
3597 	sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd),
3598 		       SG_MITER_TO_SG | SG_MITER_ATOMIC);
3599 
3600 	local_irq_save(flags);
3601 	while (sg_miter_next(&miter)) {
3602 		unsigned int offset = 0;
3603 
3604 		if (bytes == 0) {
3605 			char *hdr;
3606 			u32 list_length;
3607 			u64 max_lba, opt_lba;
3608 			u16 same;
3609 
3610 			/* Swizzle header */
3611 			hdr = miter.addr;
3612 			list_length = get_unaligned_le32(&hdr[0]);
3613 			same = get_unaligned_le16(&hdr[4]);
3614 			max_lba = get_unaligned_le64(&hdr[8]);
3615 			opt_lba = get_unaligned_le64(&hdr[16]);
3616 			put_unaligned_be32(list_length, &hdr[0]);
3617 			hdr[4] = same & 0xf;
3618 			put_unaligned_be64(max_lba, &hdr[8]);
3619 			put_unaligned_be64(opt_lba, &hdr[16]);
3620 			offset += 64;
3621 			bytes += 64;
3622 		}
3623 		while (offset < miter.length) {
3624 			char *rec;
3625 			u8 cond, type, non_seq, reset;
3626 			u64 size, start, wp;
3627 
3628 			/* Swizzle zone descriptor */
3629 			rec = miter.addr + offset;
3630 			type = rec[0] & 0xf;
3631 			cond = (rec[1] >> 4) & 0xf;
3632 			non_seq = (rec[1] & 2);
3633 			reset = (rec[1] & 1);
3634 			size = get_unaligned_le64(&rec[8]);
3635 			start = get_unaligned_le64(&rec[16]);
3636 			wp = get_unaligned_le64(&rec[24]);
3637 			rec[0] = type;
3638 			rec[1] = (cond << 4) | non_seq | reset;
3639 			put_unaligned_be64(size, &rec[8]);
3640 			put_unaligned_be64(start, &rec[16]);
3641 			put_unaligned_be64(wp, &rec[24]);
3642 			WARN_ON(offset + 64 > miter.length);
3643 			offset += 64;
3644 			bytes += 64;
3645 		}
3646 	}
3647 	sg_miter_stop(&miter);
3648 	local_irq_restore(flags);
3649 
3650 	ata_scsi_qc_complete(qc);
3651 }
3652 
3653 static unsigned int ata_scsi_zbc_in_xlat(struct ata_queued_cmd *qc)
3654 {
3655 	struct ata_taskfile *tf = &qc->tf;
3656 	struct scsi_cmnd *scmd = qc->scsicmd;
3657 	const u8 *cdb = scmd->cmnd;
3658 	u16 sect, fp = (u16)-1;
3659 	u8 sa, options, bp = 0xff;
3660 	u64 block;
3661 	u32 n_block;
3662 
3663 	if (unlikely(scmd->cmd_len < 16)) {
3664 		ata_dev_warn(qc->dev, "invalid cdb length %d\n",
3665 			     scmd->cmd_len);
3666 		fp = 15;
3667 		goto invalid_fld;
3668 	}
3669 	scsi_16_lba_len(cdb, &block, &n_block);
3670 	if (n_block != scsi_bufflen(scmd)) {
3671 		ata_dev_warn(qc->dev, "non-matching transfer count (%d/%d)\n",
3672 			     n_block, scsi_bufflen(scmd));
3673 		goto invalid_param_len;
3674 	}
3675 	sa = cdb[1] & 0x1f;
3676 	if (sa != ZI_REPORT_ZONES) {
3677 		ata_dev_warn(qc->dev, "invalid service action %d\n", sa);
3678 		fp = 1;
3679 		goto invalid_fld;
3680 	}
3681 	/*
3682 	 * ZAC allows only for transfers in 512 byte blocks,
3683 	 * and uses a 16 bit value for the transfer count.
3684 	 */
3685 	if ((n_block / 512) > 0xffff || n_block < 512 || (n_block % 512)) {
3686 		ata_dev_warn(qc->dev, "invalid transfer count %d\n", n_block);
3687 		goto invalid_param_len;
3688 	}
3689 	sect = n_block / 512;
3690 	options = cdb[14] & 0xbf;
3691 
3692 	if (ata_ncq_enabled(qc->dev) &&
3693 	    ata_fpdma_zac_mgmt_in_supported(qc->dev)) {
3694 		tf->protocol = ATA_PROT_NCQ;
3695 		tf->command = ATA_CMD_FPDMA_RECV;
3696 		tf->hob_nsect = ATA_SUBCMD_FPDMA_RECV_ZAC_MGMT_IN & 0x1f;
3697 		tf->nsect = qc->tag << 3;
3698 		tf->feature = sect & 0xff;
3699 		tf->hob_feature = (sect >> 8) & 0xff;
3700 		tf->auxiliary = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES | (options << 8);
3701 	} else {
3702 		tf->command = ATA_CMD_ZAC_MGMT_IN;
3703 		tf->feature = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES;
3704 		tf->protocol = ATA_PROT_DMA;
3705 		tf->hob_feature = options;
3706 		tf->hob_nsect = (sect >> 8) & 0xff;
3707 		tf->nsect = sect & 0xff;
3708 	}
3709 	tf->device = ATA_LBA;
3710 	tf->lbah = (block >> 16) & 0xff;
3711 	tf->lbam = (block >> 8) & 0xff;
3712 	tf->lbal = block & 0xff;
3713 	tf->hob_lbah = (block >> 40) & 0xff;
3714 	tf->hob_lbam = (block >> 32) & 0xff;
3715 	tf->hob_lbal = (block >> 24) & 0xff;
3716 
3717 	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
3718 	qc->flags |= ATA_QCFLAG_RESULT_TF;
3719 
3720 	ata_qc_set_pc_nbytes(qc);
3721 
3722 	qc->complete_fn = ata_scsi_report_zones_complete;
3723 
3724 	return 0;
3725 
3726 invalid_fld:
3727 	ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp);
3728 	return 1;
3729 
3730 invalid_param_len:
3731 	/* "Parameter list length error" */
3732 	ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3733 	return 1;
3734 }
3735 
3736 static unsigned int ata_scsi_zbc_out_xlat(struct ata_queued_cmd *qc)
3737 {
3738 	struct ata_taskfile *tf = &qc->tf;
3739 	struct scsi_cmnd *scmd = qc->scsicmd;
3740 	struct ata_device *dev = qc->dev;
3741 	const u8 *cdb = scmd->cmnd;
3742 	u8 all, sa;
3743 	u64 block;
3744 	u32 n_block;
3745 	u16 fp = (u16)-1;
3746 
3747 	if (unlikely(scmd->cmd_len < 16)) {
3748 		fp = 15;
3749 		goto invalid_fld;
3750 	}
3751 
3752 	sa = cdb[1] & 0x1f;
3753 	if ((sa != ZO_CLOSE_ZONE) && (sa != ZO_FINISH_ZONE) &&
3754 	    (sa != ZO_OPEN_ZONE) && (sa != ZO_RESET_WRITE_POINTER)) {
3755 		fp = 1;
3756 		goto invalid_fld;
3757 	}
3758 
3759 	scsi_16_lba_len(cdb, &block, &n_block);
3760 	if (n_block) {
3761 		/*
3762 		 * ZAC MANAGEMENT OUT doesn't define any length
3763 		 */
3764 		goto invalid_param_len;
3765 	}
3766 	if (block > dev->n_sectors)
3767 		goto out_of_range;
3768 
3769 	all = cdb[14] & 0x1;
3770 
3771 	if (ata_ncq_enabled(qc->dev) &&
3772 	    ata_fpdma_zac_mgmt_out_supported(qc->dev)) {
3773 		tf->protocol = ATA_PROT_NCQ_NODATA;
3774 		tf->command = ATA_CMD_NCQ_NON_DATA;
3775 		tf->feature = ATA_SUBCMD_NCQ_NON_DATA_ZAC_MGMT_OUT;
3776 		tf->nsect = qc->tag << 3;
3777 		tf->auxiliary = sa | ((u16)all << 8);
3778 	} else {
3779 		tf->protocol = ATA_PROT_NODATA;
3780 		tf->command = ATA_CMD_ZAC_MGMT_OUT;
3781 		tf->feature = sa;
3782 		tf->hob_feature = all;
3783 	}
3784 	tf->lbah = (block >> 16) & 0xff;
3785 	tf->lbam = (block >> 8) & 0xff;
3786 	tf->lbal = block & 0xff;
3787 	tf->hob_lbah = (block >> 40) & 0xff;
3788 	tf->hob_lbam = (block >> 32) & 0xff;
3789 	tf->hob_lbal = (block >> 24) & 0xff;
3790 	tf->device = ATA_LBA;
3791 	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
3792 
3793 	return 0;
3794 
3795  invalid_fld:
3796 	ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff);
3797 	return 1;
3798  out_of_range:
3799 	/* "Logical Block Address out of range" */
3800 	ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x00);
3801 	return 1;
3802 invalid_param_len:
3803 	/* "Parameter list length error" */
3804 	ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3805 	return 1;
3806 }
3807 
3808 /**
3809  *	ata_mselect_caching - Simulate MODE SELECT for caching info page
3810  *	@qc: Storage for translated ATA taskfile
3811  *	@buf: input buffer
3812  *	@len: number of valid bytes in the input buffer
3813  *	@fp: out parameter for the failed field on error
3814  *
3815  *	Prepare a taskfile to modify caching information for the device.
3816  *
3817  *	LOCKING:
3818  *	None.
3819  */
3820 static int ata_mselect_caching(struct ata_queued_cmd *qc,
3821 			       const u8 *buf, int len, u16 *fp)
3822 {
3823 	struct ata_taskfile *tf = &qc->tf;
3824 	struct ata_device *dev = qc->dev;
3825 	u8 mpage[CACHE_MPAGE_LEN];
3826 	u8 wce;
3827 	int i;
3828 
3829 	/*
3830 	 * The first two bytes of def_cache_mpage are a header, so offsets
3831 	 * in mpage are off by 2 compared to buf.  Same for len.
3832 	 */
3833 
3834 	if (len != CACHE_MPAGE_LEN - 2) {
3835 		if (len < CACHE_MPAGE_LEN - 2)
3836 			*fp = len;
3837 		else
3838 			*fp = CACHE_MPAGE_LEN - 2;
3839 		return -EINVAL;
3840 	}
3841 
3842 	wce = buf[0] & (1 << 2);
3843 
3844 	/*
3845 	 * Check that read-only bits are not modified.
3846 	 */
3847 	ata_msense_caching(dev->id, mpage, false);
3848 	for (i = 0; i < CACHE_MPAGE_LEN - 2; i++) {
3849 		if (i == 0)
3850 			continue;
3851 		if (mpage[i + 2] != buf[i]) {
3852 			*fp = i;
3853 			return -EINVAL;
3854 		}
3855 	}
3856 
3857 	tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3858 	tf->protocol = ATA_PROT_NODATA;
3859 	tf->nsect = 0;
3860 	tf->command = ATA_CMD_SET_FEATURES;
3861 	tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF;
3862 	return 0;
3863 }
3864 
3865 /**
3866  *	ata_mselect_control - Simulate MODE SELECT for control page
3867  *	@qc: Storage for translated ATA taskfile
3868  *	@buf: input buffer
3869  *	@len: number of valid bytes in the input buffer
3870  *	@fp: out parameter for the failed field on error
3871  *
3872  *	Prepare a taskfile to modify caching information for the device.
3873  *
3874  *	LOCKING:
3875  *	None.
3876  */
3877 static int ata_mselect_control(struct ata_queued_cmd *qc,
3878 			       const u8 *buf, int len, u16 *fp)
3879 {
3880 	struct ata_device *dev = qc->dev;
3881 	u8 mpage[CONTROL_MPAGE_LEN];
3882 	u8 d_sense;
3883 	int i;
3884 
3885 	/*
3886 	 * The first two bytes of def_control_mpage are a header, so offsets
3887 	 * in mpage are off by 2 compared to buf.  Same for len.
3888 	 */
3889 
3890 	if (len != CONTROL_MPAGE_LEN - 2) {
3891 		if (len < CONTROL_MPAGE_LEN - 2)
3892 			*fp = len;
3893 		else
3894 			*fp = CONTROL_MPAGE_LEN - 2;
3895 		return -EINVAL;
3896 	}
3897 
3898 	d_sense = buf[0] & (1 << 2);
3899 
3900 	/*
3901 	 * Check that read-only bits are not modified.
3902 	 */
3903 	ata_msense_control(dev, mpage, false);
3904 	for (i = 0; i < CONTROL_MPAGE_LEN - 2; i++) {
3905 		if (i == 0)
3906 			continue;
3907 		if (mpage[2 + i] != buf[i]) {
3908 			*fp = i;
3909 			return -EINVAL;
3910 		}
3911 	}
3912 	if (d_sense & (1 << 2))
3913 		dev->flags |= ATA_DFLAG_D_SENSE;
3914 	else
3915 		dev->flags &= ~ATA_DFLAG_D_SENSE;
3916 	return 0;
3917 }
3918 
3919 /**
3920  *	ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands
3921  *	@qc: Storage for translated ATA taskfile
3922  *
3923  *	Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
3924  *	Assume this is invoked for direct access devices (e.g. disks) only.
3925  *	There should be no block descriptor for other device types.
3926  *
3927  *	LOCKING:
3928  *	spin_lock_irqsave(host lock)
3929  */
3930 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
3931 {
3932 	struct scsi_cmnd *scmd = qc->scsicmd;
3933 	const u8 *cdb = scmd->cmnd;
3934 	const u8 *p;
3935 	u8 pg, spg;
3936 	unsigned six_byte, pg_len, hdr_len, bd_len;
3937 	int len;
3938 	u16 fp = (u16)-1;
3939 	u8 bp = 0xff;
3940 
3941 	VPRINTK("ENTER\n");
3942 
3943 	six_byte = (cdb[0] == MODE_SELECT);
3944 	if (six_byte) {
3945 		if (scmd->cmd_len < 5) {
3946 			fp = 4;
3947 			goto invalid_fld;
3948 		}
3949 
3950 		len = cdb[4];
3951 		hdr_len = 4;
3952 	} else {
3953 		if (scmd->cmd_len < 9) {
3954 			fp = 8;
3955 			goto invalid_fld;
3956 		}
3957 
3958 		len = (cdb[7] << 8) + cdb[8];
3959 		hdr_len = 8;
3960 	}
3961 
3962 	/* We only support PF=1, SP=0.  */
3963 	if ((cdb[1] & 0x11) != 0x10) {
3964 		fp = 1;
3965 		bp = (cdb[1] & 0x01) ? 1 : 5;
3966 		goto invalid_fld;
3967 	}
3968 
3969 	/* Test early for possible overrun.  */
3970 	if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len)
3971 		goto invalid_param_len;
3972 
3973 	p = page_address(sg_page(scsi_sglist(scmd)));
3974 
3975 	/* Move past header and block descriptors.  */
3976 	if (len < hdr_len)
3977 		goto invalid_param_len;
3978 
3979 	if (six_byte)
3980 		bd_len = p[3];
3981 	else
3982 		bd_len = (p[6] << 8) + p[7];
3983 
3984 	len -= hdr_len;
3985 	p += hdr_len;
3986 	if (len < bd_len)
3987 		goto invalid_param_len;
3988 	if (bd_len != 0 && bd_len != 8) {
3989 		fp = (six_byte) ? 3 : 6;
3990 		fp += bd_len + hdr_len;
3991 		goto invalid_param;
3992 	}
3993 
3994 	len -= bd_len;
3995 	p += bd_len;
3996 	if (len == 0)
3997 		goto skip;
3998 
3999 	/* Parse both possible formats for the mode page headers.  */
4000 	pg = p[0] & 0x3f;
4001 	if (p[0] & 0x40) {
4002 		if (len < 4)
4003 			goto invalid_param_len;
4004 
4005 		spg = p[1];
4006 		pg_len = (p[2] << 8) | p[3];
4007 		p += 4;
4008 		len -= 4;
4009 	} else {
4010 		if (len < 2)
4011 			goto invalid_param_len;
4012 
4013 		spg = 0;
4014 		pg_len = p[1];
4015 		p += 2;
4016 		len -= 2;
4017 	}
4018 
4019 	/*
4020 	 * No mode subpages supported (yet) but asking for _all_
4021 	 * subpages may be valid
4022 	 */
4023 	if (spg && (spg != ALL_SUB_MPAGES)) {
4024 		fp = (p[0] & 0x40) ? 1 : 0;
4025 		fp += hdr_len + bd_len;
4026 		goto invalid_param;
4027 	}
4028 	if (pg_len > len)
4029 		goto invalid_param_len;
4030 
4031 	switch (pg) {
4032 	case CACHE_MPAGE:
4033 		if (ata_mselect_caching(qc, p, pg_len, &fp) < 0) {
4034 			fp += hdr_len + bd_len;
4035 			goto invalid_param;
4036 		}
4037 		break;
4038 	case CONTROL_MPAGE:
4039 		if (ata_mselect_control(qc, p, pg_len, &fp) < 0) {
4040 			fp += hdr_len + bd_len;
4041 			goto invalid_param;
4042 		} else {
4043 			goto skip; /* No ATA command to send */
4044 		}
4045 		break;
4046 	default:		/* invalid page code */
4047 		fp = bd_len + hdr_len;
4048 		goto invalid_param;
4049 	}
4050 
4051 	/*
4052 	 * Only one page has changeable data, so we only support setting one
4053 	 * page at a time.
4054 	 */
4055 	if (len > pg_len)
4056 		goto invalid_param;
4057 
4058 	return 0;
4059 
4060  invalid_fld:
4061 	ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp);
4062 	return 1;
4063 
4064  invalid_param:
4065 	ata_scsi_set_invalid_parameter(qc->dev, scmd, fp);
4066 	return 1;
4067 
4068  invalid_param_len:
4069 	/* "Parameter list length error" */
4070 	ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
4071 	return 1;
4072 
4073  skip:
4074 	scmd->result = SAM_STAT_GOOD;
4075 	return 1;
4076 }
4077 
4078 /**
4079  *	ata_get_xlat_func - check if SCSI to ATA translation is possible
4080  *	@dev: ATA device
4081  *	@cmd: SCSI command opcode to consider
4082  *
4083  *	Look up the SCSI command given, and determine whether the
4084  *	SCSI command is to be translated or simulated.
4085  *
4086  *	RETURNS:
4087  *	Pointer to translation function if possible, %NULL if not.
4088  */
4089 
4090 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
4091 {
4092 	switch (cmd) {
4093 	case READ_6:
4094 	case READ_10:
4095 	case READ_16:
4096 
4097 	case WRITE_6:
4098 	case WRITE_10:
4099 	case WRITE_16:
4100 		return ata_scsi_rw_xlat;
4101 
4102 	case WRITE_SAME_16:
4103 		return ata_scsi_write_same_xlat;
4104 
4105 	case SYNCHRONIZE_CACHE:
4106 		if (ata_try_flush_cache(dev))
4107 			return ata_scsi_flush_xlat;
4108 		break;
4109 
4110 	case VERIFY:
4111 	case VERIFY_16:
4112 		return ata_scsi_verify_xlat;
4113 
4114 	case ATA_12:
4115 	case ATA_16:
4116 		return ata_scsi_pass_thru;
4117 
4118 	case MODE_SELECT:
4119 	case MODE_SELECT_10:
4120 		return ata_scsi_mode_select_xlat;
4121 		break;
4122 
4123 	case ZBC_IN:
4124 		return ata_scsi_zbc_in_xlat;
4125 
4126 	case ZBC_OUT:
4127 		return ata_scsi_zbc_out_xlat;
4128 
4129 	case START_STOP:
4130 		return ata_scsi_start_stop_xlat;
4131 	}
4132 
4133 	return NULL;
4134 }
4135 
4136 /**
4137  *	ata_scsi_dump_cdb - dump SCSI command contents to dmesg
4138  *	@ap: ATA port to which the command was being sent
4139  *	@cmd: SCSI command to dump
4140  *
4141  *	Prints the contents of a SCSI command via printk().
4142  */
4143 
4144 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
4145 				     struct scsi_cmnd *cmd)
4146 {
4147 #ifdef ATA_DEBUG
4148 	struct scsi_device *scsidev = cmd->device;
4149 
4150 	DPRINTK("CDB (%u:%d,%d,%d) %9ph\n",
4151 		ap->print_id,
4152 		scsidev->channel, scsidev->id, scsidev->lun,
4153 		cmd->cmnd);
4154 #endif
4155 }
4156 
4157 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
4158 				      struct ata_device *dev)
4159 {
4160 	u8 scsi_op = scmd->cmnd[0];
4161 	ata_xlat_func_t xlat_func;
4162 	int rc = 0;
4163 
4164 	if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
4165 		if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
4166 			goto bad_cdb_len;
4167 
4168 		xlat_func = ata_get_xlat_func(dev, scsi_op);
4169 	} else {
4170 		if (unlikely(!scmd->cmd_len))
4171 			goto bad_cdb_len;
4172 
4173 		xlat_func = NULL;
4174 		if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
4175 			/* relay SCSI command to ATAPI device */
4176 			int len = COMMAND_SIZE(scsi_op);
4177 			if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
4178 				goto bad_cdb_len;
4179 
4180 			xlat_func = atapi_xlat;
4181 		} else {
4182 			/* ATA_16 passthru, treat as an ATA command */
4183 			if (unlikely(scmd->cmd_len > 16))
4184 				goto bad_cdb_len;
4185 
4186 			xlat_func = ata_get_xlat_func(dev, scsi_op);
4187 		}
4188 	}
4189 
4190 	if (xlat_func)
4191 		rc = ata_scsi_translate(dev, scmd, xlat_func);
4192 	else
4193 		ata_scsi_simulate(dev, scmd);
4194 
4195 	return rc;
4196 
4197  bad_cdb_len:
4198 	DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
4199 		scmd->cmd_len, scsi_op, dev->cdb_len);
4200 	scmd->result = DID_ERROR << 16;
4201 	scmd->scsi_done(scmd);
4202 	return 0;
4203 }
4204 
4205 /**
4206  *	ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
4207  *	@shost: SCSI host of command to be sent
4208  *	@cmd: SCSI command to be sent
4209  *
4210  *	In some cases, this function translates SCSI commands into
4211  *	ATA taskfiles, and queues the taskfiles to be sent to
4212  *	hardware.  In other cases, this function simulates a
4213  *	SCSI device by evaluating and responding to certain
4214  *	SCSI commands.  This creates the overall effect of
4215  *	ATA and ATAPI devices appearing as SCSI devices.
4216  *
4217  *	LOCKING:
4218  *	ATA host lock
4219  *
4220  *	RETURNS:
4221  *	Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4222  *	0 otherwise.
4223  */
4224 int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
4225 {
4226 	struct ata_port *ap;
4227 	struct ata_device *dev;
4228 	struct scsi_device *scsidev = cmd->device;
4229 	int rc = 0;
4230 	unsigned long irq_flags;
4231 
4232 	ap = ata_shost_to_port(shost);
4233 
4234 	spin_lock_irqsave(ap->lock, irq_flags);
4235 
4236 	ata_scsi_dump_cdb(ap, cmd);
4237 
4238 	dev = ata_scsi_find_dev(ap, scsidev);
4239 	if (likely(dev))
4240 		rc = __ata_scsi_queuecmd(cmd, dev);
4241 	else {
4242 		cmd->result = (DID_BAD_TARGET << 16);
4243 		cmd->scsi_done(cmd);
4244 	}
4245 
4246 	spin_unlock_irqrestore(ap->lock, irq_flags);
4247 
4248 	return rc;
4249 }
4250 
4251 /**
4252  *	ata_scsi_simulate - simulate SCSI command on ATA device
4253  *	@dev: the target device
4254  *	@cmd: SCSI command being sent to device.
4255  *
4256  *	Interprets and directly executes a select list of SCSI commands
4257  *	that can be handled internally.
4258  *
4259  *	LOCKING:
4260  *	spin_lock_irqsave(host lock)
4261  */
4262 
4263 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
4264 {
4265 	struct ata_scsi_args args;
4266 	const u8 *scsicmd = cmd->cmnd;
4267 	u8 tmp8;
4268 
4269 	args.dev = dev;
4270 	args.id = dev->id;
4271 	args.cmd = cmd;
4272 	args.done = cmd->scsi_done;
4273 
4274 	switch(scsicmd[0]) {
4275 	case INQUIRY:
4276 		if (scsicmd[1] & 2)		   /* is CmdDt set?  */
4277 		    ata_scsi_invalid_field(dev, cmd, 1);
4278 		else if ((scsicmd[1] & 1) == 0)    /* is EVPD clear? */
4279 			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
4280 		else switch (scsicmd[2]) {
4281 		case 0x00:
4282 			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
4283 			break;
4284 		case 0x80:
4285 			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
4286 			break;
4287 		case 0x83:
4288 			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
4289 			break;
4290 		case 0x89:
4291 			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
4292 			break;
4293 		case 0xb0:
4294 			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
4295 			break;
4296 		case 0xb1:
4297 			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
4298 			break;
4299 		case 0xb2:
4300 			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
4301 			break;
4302 		case 0xb6:
4303 			if (dev->flags & ATA_DFLAG_ZAC) {
4304 				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b6);
4305 				break;
4306 			}
4307 			/* Fallthrough */
4308 		default:
4309 			ata_scsi_invalid_field(dev, cmd, 2);
4310 			break;
4311 		}
4312 		break;
4313 
4314 	case MODE_SENSE:
4315 	case MODE_SENSE_10:
4316 		ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
4317 		break;
4318 
4319 	case READ_CAPACITY:
4320 		ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
4321 		break;
4322 
4323 	case SERVICE_ACTION_IN_16:
4324 		if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
4325 			ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
4326 		else
4327 			ata_scsi_invalid_field(dev, cmd, 1);
4328 		break;
4329 
4330 	case REPORT_LUNS:
4331 		ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
4332 		break;
4333 
4334 	case REQUEST_SENSE:
4335 		ata_scsi_set_sense(dev, cmd, 0, 0, 0);
4336 		cmd->result = (DRIVER_SENSE << 24);
4337 		cmd->scsi_done(cmd);
4338 		break;
4339 
4340 	/* if we reach this, then writeback caching is disabled,
4341 	 * turning this into a no-op.
4342 	 */
4343 	case SYNCHRONIZE_CACHE:
4344 		/* fall through */
4345 
4346 	/* no-op's, complete with success */
4347 	case REZERO_UNIT:
4348 	case SEEK_6:
4349 	case SEEK_10:
4350 	case TEST_UNIT_READY:
4351 		ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
4352 		break;
4353 
4354 	case SEND_DIAGNOSTIC:
4355 		tmp8 = scsicmd[1] & ~(1 << 3);
4356 		if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
4357 			ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
4358 		else
4359 			ata_scsi_invalid_field(dev, cmd, 1);
4360 		break;
4361 
4362 	case MAINTENANCE_IN:
4363 		if (scsicmd[1] == MI_REPORT_SUPPORTED_OPERATION_CODES)
4364 			ata_scsi_rbuf_fill(&args, ata_scsiop_maint_in);
4365 		else
4366 			ata_scsi_invalid_field(dev, cmd, 1);
4367 		break;
4368 
4369 	/* all other commands */
4370 	default:
4371 		ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x20, 0x0);
4372 		/* "Invalid command operation code" */
4373 		cmd->scsi_done(cmd);
4374 		break;
4375 	}
4376 }
4377 
4378 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
4379 {
4380 	int i, rc;
4381 
4382 	for (i = 0; i < host->n_ports; i++) {
4383 		struct ata_port *ap = host->ports[i];
4384 		struct Scsi_Host *shost;
4385 
4386 		rc = -ENOMEM;
4387 		shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
4388 		if (!shost)
4389 			goto err_alloc;
4390 
4391 		shost->eh_noresume = 1;
4392 		*(struct ata_port **)&shost->hostdata[0] = ap;
4393 		ap->scsi_host = shost;
4394 
4395 		shost->transportt = ata_scsi_transport_template;
4396 		shost->unique_id = ap->print_id;
4397 		shost->max_id = 16;
4398 		shost->max_lun = 1;
4399 		shost->max_channel = 1;
4400 		shost->max_cmd_len = 16;
4401 
4402 		/* Schedule policy is determined by ->qc_defer()
4403 		 * callback and it needs to see every deferred qc.
4404 		 * Set host_blocked to 1 to prevent SCSI midlayer from
4405 		 * automatically deferring requests.
4406 		 */
4407 		shost->max_host_blocked = 1;
4408 
4409 		rc = scsi_add_host_with_dma(ap->scsi_host,
4410 						&ap->tdev, ap->host->dev);
4411 		if (rc)
4412 			goto err_add;
4413 	}
4414 
4415 	return 0;
4416 
4417  err_add:
4418 	scsi_host_put(host->ports[i]->scsi_host);
4419  err_alloc:
4420 	while (--i >= 0) {
4421 		struct Scsi_Host *shost = host->ports[i]->scsi_host;
4422 
4423 		scsi_remove_host(shost);
4424 		scsi_host_put(shost);
4425 	}
4426 	return rc;
4427 }
4428 
4429 void ata_scsi_scan_host(struct ata_port *ap, int sync)
4430 {
4431 	int tries = 5;
4432 	struct ata_device *last_failed_dev = NULL;
4433 	struct ata_link *link;
4434 	struct ata_device *dev;
4435 
4436  repeat:
4437 	ata_for_each_link(link, ap, EDGE) {
4438 		ata_for_each_dev(dev, link, ENABLED) {
4439 			struct scsi_device *sdev;
4440 			int channel = 0, id = 0;
4441 
4442 			if (dev->sdev)
4443 				continue;
4444 
4445 			if (ata_is_host_link(link))
4446 				id = dev->devno;
4447 			else
4448 				channel = link->pmp;
4449 
4450 			sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
4451 						 NULL);
4452 			if (!IS_ERR(sdev)) {
4453 				dev->sdev = sdev;
4454 				scsi_device_put(sdev);
4455 			} else {
4456 				dev->sdev = NULL;
4457 			}
4458 		}
4459 	}
4460 
4461 	/* If we scanned while EH was in progress or allocation
4462 	 * failure occurred, scan would have failed silently.  Check
4463 	 * whether all devices are attached.
4464 	 */
4465 	ata_for_each_link(link, ap, EDGE) {
4466 		ata_for_each_dev(dev, link, ENABLED) {
4467 			if (!dev->sdev)
4468 				goto exit_loop;
4469 		}
4470 	}
4471  exit_loop:
4472 	if (!link)
4473 		return;
4474 
4475 	/* we're missing some SCSI devices */
4476 	if (sync) {
4477 		/* If caller requested synchrnous scan && we've made
4478 		 * any progress, sleep briefly and repeat.
4479 		 */
4480 		if (dev != last_failed_dev) {
4481 			msleep(100);
4482 			last_failed_dev = dev;
4483 			goto repeat;
4484 		}
4485 
4486 		/* We might be failing to detect boot device, give it
4487 		 * a few more chances.
4488 		 */
4489 		if (--tries) {
4490 			msleep(100);
4491 			goto repeat;
4492 		}
4493 
4494 		ata_port_err(ap,
4495 			     "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
4496 	}
4497 
4498 	queue_delayed_work(system_long_wq, &ap->hotplug_task,
4499 			   round_jiffies_relative(HZ));
4500 }
4501 
4502 /**
4503  *	ata_scsi_offline_dev - offline attached SCSI device
4504  *	@dev: ATA device to offline attached SCSI device for
4505  *
4506  *	This function is called from ata_eh_hotplug() and responsible
4507  *	for taking the SCSI device attached to @dev offline.  This
4508  *	function is called with host lock which protects dev->sdev
4509  *	against clearing.
4510  *
4511  *	LOCKING:
4512  *	spin_lock_irqsave(host lock)
4513  *
4514  *	RETURNS:
4515  *	1 if attached SCSI device exists, 0 otherwise.
4516  */
4517 int ata_scsi_offline_dev(struct ata_device *dev)
4518 {
4519 	if (dev->sdev) {
4520 		scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
4521 		return 1;
4522 	}
4523 	return 0;
4524 }
4525 
4526 /**
4527  *	ata_scsi_remove_dev - remove attached SCSI device
4528  *	@dev: ATA device to remove attached SCSI device for
4529  *
4530  *	This function is called from ata_eh_scsi_hotplug() and
4531  *	responsible for removing the SCSI device attached to @dev.
4532  *
4533  *	LOCKING:
4534  *	Kernel thread context (may sleep).
4535  */
4536 static void ata_scsi_remove_dev(struct ata_device *dev)
4537 {
4538 	struct ata_port *ap = dev->link->ap;
4539 	struct scsi_device *sdev;
4540 	unsigned long flags;
4541 
4542 	/* Alas, we need to grab scan_mutex to ensure SCSI device
4543 	 * state doesn't change underneath us and thus
4544 	 * scsi_device_get() always succeeds.  The mutex locking can
4545 	 * be removed if there is __scsi_device_get() interface which
4546 	 * increments reference counts regardless of device state.
4547 	 */
4548 	mutex_lock(&ap->scsi_host->scan_mutex);
4549 	spin_lock_irqsave(ap->lock, flags);
4550 
4551 	/* clearing dev->sdev is protected by host lock */
4552 	sdev = dev->sdev;
4553 	dev->sdev = NULL;
4554 
4555 	if (sdev) {
4556 		/* If user initiated unplug races with us, sdev can go
4557 		 * away underneath us after the host lock and
4558 		 * scan_mutex are released.  Hold onto it.
4559 		 */
4560 		if (scsi_device_get(sdev) == 0) {
4561 			/* The following ensures the attached sdev is
4562 			 * offline on return from ata_scsi_offline_dev()
4563 			 * regardless it wins or loses the race
4564 			 * against this function.
4565 			 */
4566 			scsi_device_set_state(sdev, SDEV_OFFLINE);
4567 		} else {
4568 			WARN_ON(1);
4569 			sdev = NULL;
4570 		}
4571 	}
4572 
4573 	spin_unlock_irqrestore(ap->lock, flags);
4574 	mutex_unlock(&ap->scsi_host->scan_mutex);
4575 
4576 	if (sdev) {
4577 		ata_dev_info(dev, "detaching (SCSI %s)\n",
4578 			     dev_name(&sdev->sdev_gendev));
4579 
4580 		scsi_remove_device(sdev);
4581 		scsi_device_put(sdev);
4582 	}
4583 }
4584 
4585 static void ata_scsi_handle_link_detach(struct ata_link *link)
4586 {
4587 	struct ata_port *ap = link->ap;
4588 	struct ata_device *dev;
4589 
4590 	ata_for_each_dev(dev, link, ALL) {
4591 		unsigned long flags;
4592 
4593 		if (!(dev->flags & ATA_DFLAG_DETACHED))
4594 			continue;
4595 
4596 		spin_lock_irqsave(ap->lock, flags);
4597 		dev->flags &= ~ATA_DFLAG_DETACHED;
4598 		spin_unlock_irqrestore(ap->lock, flags);
4599 
4600 		if (zpodd_dev_enabled(dev))
4601 			zpodd_exit(dev);
4602 
4603 		ata_scsi_remove_dev(dev);
4604 	}
4605 }
4606 
4607 /**
4608  *	ata_scsi_media_change_notify - send media change event
4609  *	@dev: Pointer to the disk device with media change event
4610  *
4611  *	Tell the block layer to send a media change notification
4612  *	event.
4613  *
4614  * 	LOCKING:
4615  * 	spin_lock_irqsave(host lock)
4616  */
4617 void ata_scsi_media_change_notify(struct ata_device *dev)
4618 {
4619 	if (dev->sdev)
4620 		sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
4621 				     GFP_ATOMIC);
4622 }
4623 
4624 /**
4625  *	ata_scsi_hotplug - SCSI part of hotplug
4626  *	@work: Pointer to ATA port to perform SCSI hotplug on
4627  *
4628  *	Perform SCSI part of hotplug.  It's executed from a separate
4629  *	workqueue after EH completes.  This is necessary because SCSI
4630  *	hot plugging requires working EH and hot unplugging is
4631  *	synchronized with hot plugging with a mutex.
4632  *
4633  *	LOCKING:
4634  *	Kernel thread context (may sleep).
4635  */
4636 void ata_scsi_hotplug(struct work_struct *work)
4637 {
4638 	struct ata_port *ap =
4639 		container_of(work, struct ata_port, hotplug_task.work);
4640 	int i;
4641 
4642 	if (ap->pflags & ATA_PFLAG_UNLOADING) {
4643 		DPRINTK("ENTER/EXIT - unloading\n");
4644 		return;
4645 	}
4646 
4647 	/*
4648 	 * XXX - UGLY HACK
4649 	 *
4650 	 * The block layer suspend/resume path is fundamentally broken due
4651 	 * to freezable kthreads and workqueue and may deadlock if a block
4652 	 * device gets removed while resume is in progress.  I don't know
4653 	 * what the solution is short of removing freezable kthreads and
4654 	 * workqueues altogether.
4655 	 *
4656 	 * The following is an ugly hack to avoid kicking off device
4657 	 * removal while freezer is active.  This is a joke but does avoid
4658 	 * this particular deadlock scenario.
4659 	 *
4660 	 * https://bugzilla.kernel.org/show_bug.cgi?id=62801
4661 	 * http://marc.info/?l=linux-kernel&m=138695698516487
4662 	 */
4663 #ifdef CONFIG_FREEZER
4664 	while (pm_freezing)
4665 		msleep(10);
4666 #endif
4667 
4668 	DPRINTK("ENTER\n");
4669 	mutex_lock(&ap->scsi_scan_mutex);
4670 
4671 	/* Unplug detached devices.  We cannot use link iterator here
4672 	 * because PMP links have to be scanned even if PMP is
4673 	 * currently not attached.  Iterate manually.
4674 	 */
4675 	ata_scsi_handle_link_detach(&ap->link);
4676 	if (ap->pmp_link)
4677 		for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
4678 			ata_scsi_handle_link_detach(&ap->pmp_link[i]);
4679 
4680 	/* scan for new ones */
4681 	ata_scsi_scan_host(ap, 0);
4682 
4683 	mutex_unlock(&ap->scsi_scan_mutex);
4684 	DPRINTK("EXIT\n");
4685 }
4686 
4687 /**
4688  *	ata_scsi_user_scan - indication for user-initiated bus scan
4689  *	@shost: SCSI host to scan
4690  *	@channel: Channel to scan
4691  *	@id: ID to scan
4692  *	@lun: LUN to scan
4693  *
4694  *	This function is called when user explicitly requests bus
4695  *	scan.  Set probe pending flag and invoke EH.
4696  *
4697  *	LOCKING:
4698  *	SCSI layer (we don't care)
4699  *
4700  *	RETURNS:
4701  *	Zero.
4702  */
4703 int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
4704 		       unsigned int id, u64 lun)
4705 {
4706 	struct ata_port *ap = ata_shost_to_port(shost);
4707 	unsigned long flags;
4708 	int devno, rc = 0;
4709 
4710 	if (!ap->ops->error_handler)
4711 		return -EOPNOTSUPP;
4712 
4713 	if (lun != SCAN_WILD_CARD && lun)
4714 		return -EINVAL;
4715 
4716 	if (!sata_pmp_attached(ap)) {
4717 		if (channel != SCAN_WILD_CARD && channel)
4718 			return -EINVAL;
4719 		devno = id;
4720 	} else {
4721 		if (id != SCAN_WILD_CARD && id)
4722 			return -EINVAL;
4723 		devno = channel;
4724 	}
4725 
4726 	spin_lock_irqsave(ap->lock, flags);
4727 
4728 	if (devno == SCAN_WILD_CARD) {
4729 		struct ata_link *link;
4730 
4731 		ata_for_each_link(link, ap, EDGE) {
4732 			struct ata_eh_info *ehi = &link->eh_info;
4733 			ehi->probe_mask |= ATA_ALL_DEVICES;
4734 			ehi->action |= ATA_EH_RESET;
4735 		}
4736 	} else {
4737 		struct ata_device *dev = ata_find_dev(ap, devno);
4738 
4739 		if (dev) {
4740 			struct ata_eh_info *ehi = &dev->link->eh_info;
4741 			ehi->probe_mask |= 1 << dev->devno;
4742 			ehi->action |= ATA_EH_RESET;
4743 		} else
4744 			rc = -EINVAL;
4745 	}
4746 
4747 	if (rc == 0) {
4748 		ata_port_schedule_eh(ap);
4749 		spin_unlock_irqrestore(ap->lock, flags);
4750 		ata_port_wait_eh(ap);
4751 	} else
4752 		spin_unlock_irqrestore(ap->lock, flags);
4753 
4754 	return rc;
4755 }
4756 
4757 /**
4758  *	ata_scsi_dev_rescan - initiate scsi_rescan_device()
4759  *	@work: Pointer to ATA port to perform scsi_rescan_device()
4760  *
4761  *	After ATA pass thru (SAT) commands are executed successfully,
4762  *	libata need to propagate the changes to SCSI layer.
4763  *
4764  *	LOCKING:
4765  *	Kernel thread context (may sleep).
4766  */
4767 void ata_scsi_dev_rescan(struct work_struct *work)
4768 {
4769 	struct ata_port *ap =
4770 		container_of(work, struct ata_port, scsi_rescan_task);
4771 	struct ata_link *link;
4772 	struct ata_device *dev;
4773 	unsigned long flags;
4774 
4775 	mutex_lock(&ap->scsi_scan_mutex);
4776 	spin_lock_irqsave(ap->lock, flags);
4777 
4778 	ata_for_each_link(link, ap, EDGE) {
4779 		ata_for_each_dev(dev, link, ENABLED) {
4780 			struct scsi_device *sdev = dev->sdev;
4781 
4782 			if (!sdev)
4783 				continue;
4784 			if (scsi_device_get(sdev))
4785 				continue;
4786 
4787 			spin_unlock_irqrestore(ap->lock, flags);
4788 			scsi_rescan_device(&(sdev->sdev_gendev));
4789 			scsi_device_put(sdev);
4790 			spin_lock_irqsave(ap->lock, flags);
4791 		}
4792 	}
4793 
4794 	spin_unlock_irqrestore(ap->lock, flags);
4795 	mutex_unlock(&ap->scsi_scan_mutex);
4796 }
4797 
4798 /**
4799  *	ata_sas_port_alloc - Allocate port for a SAS attached SATA device
4800  *	@host: ATA host container for all SAS ports
4801  *	@port_info: Information from low-level host driver
4802  *	@shost: SCSI host that the scsi device is attached to
4803  *
4804  *	LOCKING:
4805  *	PCI/etc. bus probe sem.
4806  *
4807  *	RETURNS:
4808  *	ata_port pointer on success / NULL on failure.
4809  */
4810 
4811 struct ata_port *ata_sas_port_alloc(struct ata_host *host,
4812 				    struct ata_port_info *port_info,
4813 				    struct Scsi_Host *shost)
4814 {
4815 	struct ata_port *ap;
4816 
4817 	ap = ata_port_alloc(host);
4818 	if (!ap)
4819 		return NULL;
4820 
4821 	ap->port_no = 0;
4822 	ap->lock = &host->lock;
4823 	ap->pio_mask = port_info->pio_mask;
4824 	ap->mwdma_mask = port_info->mwdma_mask;
4825 	ap->udma_mask = port_info->udma_mask;
4826 	ap->flags |= port_info->flags;
4827 	ap->ops = port_info->port_ops;
4828 	ap->cbl = ATA_CBL_SATA;
4829 
4830 	return ap;
4831 }
4832 EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
4833 
4834 /**
4835  *	ata_sas_port_start - Set port up for dma.
4836  *	@ap: Port to initialize
4837  *
4838  *	Called just after data structures for each port are
4839  *	initialized.
4840  *
4841  *	May be used as the port_start() entry in ata_port_operations.
4842  *
4843  *	LOCKING:
4844  *	Inherited from caller.
4845  */
4846 int ata_sas_port_start(struct ata_port *ap)
4847 {
4848 	/*
4849 	 * the port is marked as frozen at allocation time, but if we don't
4850 	 * have new eh, we won't thaw it
4851 	 */
4852 	if (!ap->ops->error_handler)
4853 		ap->pflags &= ~ATA_PFLAG_FROZEN;
4854 	return 0;
4855 }
4856 EXPORT_SYMBOL_GPL(ata_sas_port_start);
4857 
4858 /**
4859  *	ata_port_stop - Undo ata_sas_port_start()
4860  *	@ap: Port to shut down
4861  *
4862  *	May be used as the port_stop() entry in ata_port_operations.
4863  *
4864  *	LOCKING:
4865  *	Inherited from caller.
4866  */
4867 
4868 void ata_sas_port_stop(struct ata_port *ap)
4869 {
4870 }
4871 EXPORT_SYMBOL_GPL(ata_sas_port_stop);
4872 
4873 /**
4874  * ata_sas_async_probe - simply schedule probing and return
4875  * @ap: Port to probe
4876  *
4877  * For batch scheduling of probe for sas attached ata devices, assumes
4878  * the port has already been through ata_sas_port_init()
4879  */
4880 void ata_sas_async_probe(struct ata_port *ap)
4881 {
4882 	__ata_port_probe(ap);
4883 }
4884 EXPORT_SYMBOL_GPL(ata_sas_async_probe);
4885 
4886 int ata_sas_sync_probe(struct ata_port *ap)
4887 {
4888 	return ata_port_probe(ap);
4889 }
4890 EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
4891 
4892 
4893 /**
4894  *	ata_sas_port_init - Initialize a SATA device
4895  *	@ap: SATA port to initialize
4896  *
4897  *	LOCKING:
4898  *	PCI/etc. bus probe sem.
4899  *
4900  *	RETURNS:
4901  *	Zero on success, non-zero on error.
4902  */
4903 
4904 int ata_sas_port_init(struct ata_port *ap)
4905 {
4906 	int rc = ap->ops->port_start(ap);
4907 
4908 	if (rc)
4909 		return rc;
4910 	ap->print_id = atomic_inc_return(&ata_print_id);
4911 	return 0;
4912 }
4913 EXPORT_SYMBOL_GPL(ata_sas_port_init);
4914 
4915 /**
4916  *	ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
4917  *	@ap: SATA port to destroy
4918  *
4919  */
4920 
4921 void ata_sas_port_destroy(struct ata_port *ap)
4922 {
4923 	if (ap->ops->port_stop)
4924 		ap->ops->port_stop(ap);
4925 	kfree(ap);
4926 }
4927 EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
4928 
4929 /**
4930  *	ata_sas_slave_configure - Default slave_config routine for libata devices
4931  *	@sdev: SCSI device to configure
4932  *	@ap: ATA port to which SCSI device is attached
4933  *
4934  *	RETURNS:
4935  *	Zero.
4936  */
4937 
4938 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
4939 {
4940 	ata_scsi_sdev_config(sdev);
4941 	ata_scsi_dev_config(sdev, ap->link.device);
4942 	return 0;
4943 }
4944 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
4945 
4946 /**
4947  *	ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
4948  *	@cmd: SCSI command to be sent
4949  *	@ap:	ATA port to which the command is being sent
4950  *
4951  *	RETURNS:
4952  *	Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4953  *	0 otherwise.
4954  */
4955 
4956 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
4957 {
4958 	int rc = 0;
4959 
4960 	ata_scsi_dump_cdb(ap, cmd);
4961 
4962 	if (likely(ata_dev_enabled(ap->link.device)))
4963 		rc = __ata_scsi_queuecmd(cmd, ap->link.device);
4964 	else {
4965 		cmd->result = (DID_BAD_TARGET << 16);
4966 		cmd->scsi_done(cmd);
4967 	}
4968 	return rc;
4969 }
4970 EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
4971 
4972 int ata_sas_allocate_tag(struct ata_port *ap)
4973 {
4974 	unsigned int max_queue = ap->host->n_tags;
4975 	unsigned int i, tag;
4976 
4977 	for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) {
4978 		tag = tag < max_queue ? tag : 0;
4979 
4980 		/* the last tag is reserved for internal command. */
4981 		if (tag == ATA_TAG_INTERNAL)
4982 			continue;
4983 
4984 		if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) {
4985 			ap->sas_last_tag = tag;
4986 			return tag;
4987 		}
4988 	}
4989 	return -1;
4990 }
4991 
4992 void ata_sas_free_tag(unsigned int tag, struct ata_port *ap)
4993 {
4994 	clear_bit(tag, &ap->sas_tag_allocated);
4995 }
4996