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Root/drivers/ata/libata-scsi.c

1	/*
2	* libata-scsi.c - helper library for ATA
3	*
4	* Maintained by: Jeff Garzik <jgarzik@pobox.com>
5	* Please ALWAYS copy linux-ide@vger.kernel.org
6	* on emails.
7	*
8	* Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9	* Copyright 2003-2004 Jeff Garzik
10	*
11	*
12	* This program is free software; you can redistribute it and/or modify
13	* it under the terms of the GNU General Public License as published by
14	* the Free Software Foundation; either version 2, or (at your option)
15	* any later version.
16	*
17	* This program is distributed in the hope that it will be useful,
18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20	* GNU General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; see the file COPYING. If not, write to
24	* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
25	*
26	*
27	* libata documentation is available via 'make {ps\|pdf}docs',
28	* as Documentation/DocBook/libata.*
29	*
30	* Hardware documentation available from
31	* - http://www.t10.org/
32	* - http://www.t13.org/
33	*
34	*/
35
36	#include <linux/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 *dev,
115	struct device_attribute *attr,
116	const char *buf, size_t count)
117	{
118	struct Scsi_Host *shost = class_to_shost(dev);
119	struct ata_port *ap = ata_shost_to_port(shost);
120	enum ata_lpm_policy policy;
121	unsigned long flags;
122
123	/* UNKNOWN is internal state, iterate from MAX_POWER */
124	for (policy = ATA_LPM_MAX_POWER;
125	policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
126	const char *name = ata_lpm_policy_names[policy];
127
128	if (strncmp(name, buf, strlen(name)) == 0)
129	break;
130	}
131	if (policy == ARRAY_SIZE(ata_lpm_policy_names))
132	return -EINVAL;
133
134	spin_lock_irqsave(ap->lock, flags);
135	ap->target_lpm_policy = policy;
136	ata_port_schedule_eh(ap);
137	spin_unlock_irqrestore(ap->lock, flags);
138
139	return count;
140	}
141
142	static ssize_t ata_scsi_lpm_show(struct device *dev,
143	struct device_attribute attr, char buf)
144	{
145	struct Scsi_Host *shost = class_to_shost(dev);
146	struct ata_port *ap = ata_shost_to_port(shost);
147
148	if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
149	return -EINVAL;
150
151	return snprintf(buf, PAGE_SIZE, "%s\n",
152	ata_lpm_policy_names[ap->target_lpm_policy]);
153	}
154	DEVICE_ATTR(link_power_management_policy, S_IRUGO \| S_IWUSR,
155	ata_scsi_lpm_show, ata_scsi_lpm_store);
156	EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
157
158	static ssize_t ata_scsi_park_show(struct device *device,
159	struct device_attribute attr, char buf)
160	{
161	struct scsi_device *sdev = to_scsi_device(device);
162	struct ata_port *ap;
163	struct ata_link *link;
164	struct ata_device *dev;
165	unsigned long flags, now;
166	unsigned int uninitialized_var(msecs);
167	int rc = 0;
168
169	ap = ata_shost_to_port(sdev->host);
170
171	spin_lock_irqsave(ap->lock, flags);
172	dev = ata_scsi_find_dev(ap, sdev);
173	if (!dev) {
174	rc = -ENODEV;
175	goto unlock;
176	}
177	if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
178	rc = -EOPNOTSUPP;
179	goto unlock;
180	}
181
182	link = dev->link;
183	now = jiffies;
184	if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
185	link->eh_context.unloaded_mask & (1 << dev->devno) &&
186	time_after(dev->unpark_deadline, now))
187	msecs = jiffies_to_msecs(dev->unpark_deadline - now);
188	else
189	msecs = 0;
190
191	unlock:
192	spin_unlock_irq(ap->lock);
193
194	return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
195	}
196
197	static ssize_t ata_scsi_park_store(struct device *device,
198	struct device_attribute *attr,
199	const char *buf, size_t len)
200	{
201	struct scsi_device *sdev = to_scsi_device(device);
202	struct ata_port *ap;
203	struct ata_device *dev;
204	long int input;
205	unsigned long flags;
206	int rc;
207
208	rc = strict_strtol(buf, 10, &input);
209	if (rc \|\| input < -2)
210	return -EINVAL;
211	if (input > ATA_TMOUT_MAX_PARK) {
212	rc = -EOVERFLOW;
213	input = ATA_TMOUT_MAX_PARK;
214	}
215
216	ap = ata_shost_to_port(sdev->host);
217
218	spin_lock_irqsave(ap->lock, flags);
219	dev = ata_scsi_find_dev(ap, sdev);
220	if (unlikely(!dev)) {
221	rc = -ENODEV;
222	goto unlock;
223	}
224	if (dev->class != ATA_DEV_ATA) {
225	rc = -EOPNOTSUPP;
226	goto unlock;
227	}
228
229	if (input >= 0) {
230	if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
231	rc = -EOPNOTSUPP;
232	goto unlock;
233	}
234
235	dev->unpark_deadline = ata_deadline(jiffies, input);
236	dev->link->eh_info.dev_action[dev->devno] \|= ATA_EH_PARK;
237	ata_port_schedule_eh(ap);
238	complete(&ap->park_req_pending);
239	} else {
240	switch (input) {
241	case -1:
242	dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
243	break;
244	case -2:
245	dev->flags \|= ATA_DFLAG_NO_UNLOAD;
246	break;
247	}
248	}
249	unlock:
250	spin_unlock_irqrestore(ap->lock, flags);
251
252	return rc ? rc : len;
253	}
254	DEVICE_ATTR(unload_heads, S_IRUGO \| S_IWUSR,
255	ata_scsi_park_show, ata_scsi_park_store);
256	EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
257
258	static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
259	{
260	cmd->result = (DRIVER_SENSE << 24) \| SAM_STAT_CHECK_CONDITION;
261
262	scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
263	}
264
265	static ssize_t
266	ata_scsi_em_message_store(struct device dev, struct device_attribute attr,
267	const char *buf, size_t count)
268	{
269	struct Scsi_Host *shost = class_to_shost(dev);
270	struct ata_port *ap = ata_shost_to_port(shost);
271	if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
272	return ap->ops->em_store(ap, buf, count);
273	return -EINVAL;
274	}
275
276	static ssize_t
277	ata_scsi_em_message_show(struct device dev, struct device_attribute attr,
278	char *buf)
279	{
280	struct Scsi_Host *shost = class_to_shost(dev);
281	struct ata_port *ap = ata_shost_to_port(shost);
282
283	if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
284	return ap->ops->em_show(ap, buf);
285	return -EINVAL;
286	}
287	DEVICE_ATTR(em_message, S_IRUGO \| S_IWUSR,
288	ata_scsi_em_message_show, ata_scsi_em_message_store);
289	EXPORT_SYMBOL_GPL(dev_attr_em_message);
290
291	static ssize_t
292	ata_scsi_em_message_type_show(struct device dev, struct device_attribute attr,
293	char *buf)
294	{
295	struct Scsi_Host *shost = class_to_shost(dev);
296	struct ata_port *ap = ata_shost_to_port(shost);
297
298	return snprintf(buf, 23, "%d\n", ap->em_message_type);
299	}
300	DEVICE_ATTR(em_message_type, S_IRUGO,
301	ata_scsi_em_message_type_show, NULL);
302	EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
303
304	static ssize_t
305	ata_scsi_activity_show(struct device dev, struct device_attribute attr,
306	char *buf)
307	{
308	struct scsi_device *sdev = to_scsi_device(dev);
309	struct ata_port *ap = ata_shost_to_port(sdev->host);
310	struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
311
312	if (ap->ops->sw_activity_show && (ap->flags & ATA_FLAG_SW_ACTIVITY))
313	return ap->ops->sw_activity_show(atadev, buf);
314	return -EINVAL;
315	}
316
317	static ssize_t
318	ata_scsi_activity_store(struct device dev, struct device_attribute attr,
319	const char *buf, size_t count)
320	{
321	struct scsi_device *sdev = to_scsi_device(dev);
322	struct ata_port *ap = ata_shost_to_port(sdev->host);
323	struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
324	enum sw_activity val;
325	int rc;
326
327	if (ap->ops->sw_activity_store && (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
328	val = simple_strtoul(buf, NULL, 0);
329	switch (val) {
330	case OFF: case BLINK_ON: case BLINK_OFF:
331	rc = ap->ops->sw_activity_store(atadev, val);
332	if (!rc)
333	return count;
334	else
335	return rc;
336	}
337	}
338	return -EINVAL;
339	}
340	DEVICE_ATTR(sw_activity, S_IWUSR \| S_IRUGO, ata_scsi_activity_show,
341	ata_scsi_activity_store);
342	EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
343
344	struct device_attribute *ata_common_sdev_attrs[] = {
345	&dev_attr_unload_heads,
346	NULL
347	};
348	EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
349
350	static void ata_scsi_invalid_field(struct scsi_cmnd *cmd)
351	{
352	ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
353	/* "Invalid field in cbd" */
354	cmd->scsi_done(cmd);
355	}
356
357	/**
358	* ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
359	* @sdev: SCSI device for which BIOS geometry is to be determined
360	* @bdev: block device associated with @sdev
361	* @capacity: capacity of SCSI device
362	* @geom: location to which geometry will be output
363	*
364	* Generic bios head/sector/cylinder calculator
365	* used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
366	* mapping. Some situations may arise where the disk is not
367	* bootable if this is not used.
368	*
369	* LOCKING:
370	* Defined by the SCSI layer. We don't really care.
371	*
372	* RETURNS:
373	* Zero.
374	*/
375	int ata_std_bios_param(struct scsi_device sdev, struct block_device bdev,
376	sector_t capacity, int geom[])
377	{
378	geom[0] = 255;
379	geom[1] = 63;
380	sector_div(capacity, 255*63);
381	geom[2] = capacity;
382
383	return 0;
384	}
385
386	/**
387	* ata_scsi_unlock_native_capacity - unlock native capacity
388	* @sdev: SCSI device to adjust device capacity for
389	*
390	* This function is called if a partition on @sdev extends beyond
391	* the end of the device. It requests EH to unlock HPA.
392	*
393	* LOCKING:
394	* Defined by the SCSI layer. Might sleep.
395	*/
396	void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
397	{
398	struct ata_port *ap = ata_shost_to_port(sdev->host);
399	struct ata_device *dev;
400	unsigned long flags;
401
402	spin_lock_irqsave(ap->lock, flags);
403
404	dev = ata_scsi_find_dev(ap, sdev);
405	if (dev && dev->n_sectors < dev->n_native_sectors) {
406	dev->flags \|= ATA_DFLAG_UNLOCK_HPA;
407	dev->link->eh_info.action \|= ATA_EH_RESET;
408	ata_port_schedule_eh(ap);
409	}
410
411	spin_unlock_irqrestore(ap->lock, flags);
412	ata_port_wait_eh(ap);
413	}
414
415	/**
416	* ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
417	* @ap: target port
418	* @sdev: SCSI device to get identify data for
419	* @arg: User buffer area for identify data
420	*
421	* LOCKING:
422	* Defined by the SCSI layer. We don't really care.
423	*
424	* RETURNS:
425	* Zero on success, negative errno on error.
426	*/
427	static int ata_get_identity(struct ata_port ap, struct scsi_device sdev,
428	void __user *arg)
429	{
430	struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
431	u16 __user *dst = arg;
432	char buf[40];
433
434	if (!dev)
435	return -ENOMSG;
436
437	if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
438	return -EFAULT;
439
440	ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
441	if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
442	return -EFAULT;
443
444	ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
445	if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
446	return -EFAULT;
447
448	ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
449	if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
450	return -EFAULT;
451
452	return 0;
453	}
454
455	/**
456	* ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
457	* @scsidev: Device to which we are issuing command
458	* @arg: User provided data for issuing command
459	*
460	* LOCKING:
461	* Defined by the SCSI layer. We don't really care.
462	*
463	* RETURNS:
464	* Zero on success, negative errno on error.
465	*/
466	int ata_cmd_ioctl(struct scsi_device scsidev, void __user arg)
467	{
468	int rc = 0;
469	u8 scsi_cmd[MAX_COMMAND_SIZE];
470	u8 args[4], argbuf = NULL, sensebuf = NULL;
471	int argsize = 0;
472	enum dma_data_direction data_dir;
473	int cmd_result;
474
475	if (arg == NULL)
476	return -EINVAL;
477
478	if (copy_from_user(args, arg, sizeof(args)))
479	return -EFAULT;
480
481	sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
482	if (!sensebuf)
483	return -ENOMEM;
484
485	memset(scsi_cmd, 0, sizeof(scsi_cmd));
486
487	if (args[3]) {
488	argsize = ATA_SECT_SIZE * args[3];
489	argbuf = kmalloc(argsize, GFP_KERNEL);
490	if (argbuf == NULL) {
491	rc = -ENOMEM;
492	goto error;
493	}
494
495	scsi_cmd[1] = (4 << 1); /* PIO Data-in */
496	scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
497	block count in sector count field */
498	data_dir = DMA_FROM_DEVICE;
499	} else {
500	scsi_cmd[1] = (3 << 1); /* Non-data */
501	scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
502	data_dir = DMA_NONE;
503	}
504
505	scsi_cmd[0] = ATA_16;
506
507	scsi_cmd[4] = args[2];
508	if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
509	scsi_cmd[6] = args[3];
510	scsi_cmd[8] = args[1];
511	scsi_cmd[10] = 0x4f;
512	scsi_cmd[12] = 0xc2;
513	} else {
514	scsi_cmd[6] = args[1];
515	}
516	scsi_cmd[14] = args[0];
517
518	/* Good values for timeout and retries? Values below
519	from scsi_ioctl_send_command() for default case... */
520	cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
521	sensebuf, (10*HZ), 5, 0, NULL);
522
523	if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
524	u8 *desc = sensebuf + 8;
525	cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
526
527	/* If we set cc then ATA pass-through will cause a
528	* check condition even if no error. Filter that. */
529	if (cmd_result & SAM_STAT_CHECK_CONDITION) {
530	struct scsi_sense_hdr sshdr;
531	scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
532	&sshdr);
533	if (sshdr.sense_key == 0 &&
534	sshdr.asc == 0 && sshdr.ascq == 0)
535	cmd_result &= ~SAM_STAT_CHECK_CONDITION;
536	}
537
538	/* Send userspace a few ATA registers (same as drivers/ide) */
539	if (sensebuf[0] == 0x72 && /* format is "descriptor" */
540	desc[0] == 0x09) { /* code is "ATA Descriptor" */
541	args[0] = desc[13]; /* status */
542	args[1] = desc[3]; /* error */
543	args[2] = desc[5]; /* sector count (0:7) */
544	if (copy_to_user(arg, args, sizeof(args)))
545	rc = -EFAULT;
546	}
547	}
548
549
550	if (cmd_result) {
551	rc = -EIO;
552	goto error;
553	}
554
555	if ((argbuf)
556	&& copy_to_user(arg + sizeof(args), argbuf, argsize))
557	rc = -EFAULT;
558	error:
559	kfree(sensebuf);
560	kfree(argbuf);
561	return rc;
562	}
563
564	/**
565	* ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
566	* @scsidev: Device to which we are issuing command
567	* @arg: User provided data for issuing command
568	*
569	* LOCKING:
570	* Defined by the SCSI layer. We don't really care.
571	*
572	* RETURNS:
573	* Zero on success, negative errno on error.
574	*/
575	int ata_task_ioctl(struct scsi_device scsidev, void __user arg)
576	{
577	int rc = 0;
578	u8 scsi_cmd[MAX_COMMAND_SIZE];
579	u8 args[7], *sensebuf = NULL;
580	int cmd_result;
581
582	if (arg == NULL)
583	return -EINVAL;
584
585	if (copy_from_user(args, arg, sizeof(args)))
586	return -EFAULT;
587
588	sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
589	if (!sensebuf)
590	return -ENOMEM;
591
592	memset(scsi_cmd, 0, sizeof(scsi_cmd));
593	scsi_cmd[0] = ATA_16;
594	scsi_cmd[1] = (3 << 1); /* Non-data */
595	scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
596	scsi_cmd[4] = args[1];
597	scsi_cmd[6] = args[2];
598	scsi_cmd[8] = args[3];
599	scsi_cmd[10] = args[4];
600	scsi_cmd[12] = args[5];
601	scsi_cmd[13] = args[6] & 0x4f;
602	scsi_cmd[14] = args[0];
603
604	/* Good values for timeout and retries? Values below
605	from scsi_ioctl_send_command() for default case... */
606	cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
607	sensebuf, (10*HZ), 5, 0, NULL);
608
609	if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
610	u8 *desc = sensebuf + 8;
611	cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
612
613	/* If we set cc then ATA pass-through will cause a
614	* check condition even if no error. Filter that. */
615	if (cmd_result & SAM_STAT_CHECK_CONDITION) {
616	struct scsi_sense_hdr sshdr;
617	scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
618	&sshdr);
619	if (sshdr.sense_key == 0 &&
620	sshdr.asc == 0 && sshdr.ascq == 0)
621	cmd_result &= ~SAM_STAT_CHECK_CONDITION;
622	}
623
624	/* Send userspace ATA registers */
625	if (sensebuf[0] == 0x72 && /* format is "descriptor" */
626	desc[0] == 0x09) {/* code is "ATA Descriptor" */
627	args[0] = desc[13]; /* status */
628	args[1] = desc[3]; /* error */
629	args[2] = desc[5]; /* sector count (0:7) */
630	args[3] = desc[7]; /* lbal */
631	args[4] = desc[9]; /* lbam */
632	args[5] = desc[11]; /* lbah */
633	args[6] = desc[12]; /* select */
634	if (copy_to_user(arg, args, sizeof(args)))
635	rc = -EFAULT;
636	}
637	}
638
639	if (cmd_result) {
640	rc = -EIO;
641	goto error;
642	}
643
644	error:
645	kfree(sensebuf);
646	return rc;
647	}
648
649	static int ata_ioc32(struct ata_port *ap)
650	{
651	if (ap->flags & ATA_FLAG_PIO_DMA)
652	return 1;
653	if (ap->pflags & ATA_PFLAG_PIO32)
654	return 1;
655	return 0;
656	}
657
658	int ata_sas_scsi_ioctl(struct ata_port ap, struct scsi_device scsidev,
659	int cmd, void __user *arg)
660	{
661	int val = -EINVAL, rc = -EINVAL;
662	unsigned long flags;
663
664	switch (cmd) {
665	case ATA_IOC_GET_IO32:
666	spin_lock_irqsave(ap->lock, flags);
667	val = ata_ioc32(ap);
668	spin_unlock_irqrestore(ap->lock, flags);
669	if (copy_to_user(arg, &val, 1))
670	return -EFAULT;
671	return 0;
672
673	case ATA_IOC_SET_IO32:
674	val = (unsigned long) arg;
675	rc = 0;
676	spin_lock_irqsave(ap->lock, flags);
677	if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
678	if (val)
679	ap->pflags \|= ATA_PFLAG_PIO32;
680	else
681	ap->pflags &= ~ATA_PFLAG_PIO32;
682	} else {
683	if (val != ata_ioc32(ap))
684	rc = -EINVAL;
685	}
686	spin_unlock_irqrestore(ap->lock, flags);
687	return rc;
688
689	case HDIO_GET_IDENTITY:
690	return ata_get_identity(ap, scsidev, arg);
691
692	case HDIO_DRIVE_CMD:
693	if (!capable(CAP_SYS_ADMIN) \|\| !capable(CAP_SYS_RAWIO))
694	return -EACCES;
695	return ata_cmd_ioctl(scsidev, arg);
696
697	case HDIO_DRIVE_TASK:
698	if (!capable(CAP_SYS_ADMIN) \|\| !capable(CAP_SYS_RAWIO))
699	return -EACCES;
700	return ata_task_ioctl(scsidev, arg);
701
702	default:
703	rc = -ENOTTY;
704	break;
705	}
706
707	return rc;
708	}
709	EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
710
711	int ata_scsi_ioctl(struct scsi_device scsidev, int cmd, void __user arg)
712	{
713	return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
714	scsidev, cmd, arg);
715	}
716	EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
717
718	/**
719	* ata_scsi_qc_new - acquire new ata_queued_cmd reference
720	* @dev: ATA device to which the new command is attached
721	* @cmd: SCSI command that originated this ATA command
722	*
723	* Obtain a reference to an unused ata_queued_cmd structure,
724	* which is the basic libata structure representing a single
725	* ATA command sent to the hardware.
726	*
727	* If a command was available, fill in the SCSI-specific
728	* portions of the structure with information on the
729	* current command.
730	*
731	* LOCKING:
732	* spin_lock_irqsave(host lock)
733	*
734	* RETURNS:
735	* Command allocated, or %NULL if none available.
736	*/
737	static struct ata_queued_cmd ata_scsi_qc_new(struct ata_device dev,
738	struct scsi_cmnd *cmd)
739	{
740	struct ata_queued_cmd *qc;
741
742	qc = ata_qc_new_init(dev);
743	if (qc) {
744	qc->scsicmd = cmd;
745	qc->scsidone = cmd->scsi_done;
746
747	qc->sg = scsi_sglist(cmd);
748	qc->n_elem = scsi_sg_count(cmd);
749	} else {
750	cmd->result = (DID_OK << 16) \| (QUEUE_FULL << 1);
751	cmd->scsi_done(cmd);
752	}
753
754	return qc;
755	}
756
757	static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
758	{
759	struct scsi_cmnd *scmd = qc->scsicmd;
760
761	qc->extrabytes = scmd->request->extra_len;
762	qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
763	}
764
765	/**
766	* ata_dump_status - user friendly display of error info
767	* @id: id of the port in question
768	* @tf: ptr to filled out taskfile
769	*
770	* Decode and dump the ATA error/status registers for the user so
771	* that they have some idea what really happened at the non
772	* make-believe layer.
773	*
774	* LOCKING:
775	* inherited from caller
776	*/
777	static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
778	{
779	u8 stat = tf->command, err = tf->feature;
780
781	printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
782	if (stat & ATA_BUSY) {
783	printk("Busy }\n"); /* Data is not valid in this case */
784	} else {
785	if (stat & 0x40) printk("DriveReady ");
786	if (stat & 0x20) printk("DeviceFault ");
787	if (stat & 0x10) printk("SeekComplete ");
788	if (stat & 0x08) printk("DataRequest ");
789	if (stat & 0x04) printk("CorrectedError ");
790	if (stat & 0x02) printk("Index ");
791	if (stat & 0x01) printk("Error ");
792	printk("}\n");
793
794	if (err) {
795	printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
796	if (err & 0x04) printk("DriveStatusError ");
797	if (err & 0x80) {
798	if (err & 0x04) printk("BadCRC ");
799	else printk("Sector ");
800	}
801	if (err & 0x40) printk("UncorrectableError ");
802	if (err & 0x10) printk("SectorIdNotFound ");
803	if (err & 0x02) printk("TrackZeroNotFound ");
804	if (err & 0x01) printk("AddrMarkNotFound ");
805	printk("}\n");
806	}
807	}
808	}
809
810	/**
811	* ata_to_sense_error - convert ATA error to SCSI error
812	* @id: ATA device number
813	* @drv_stat: value contained in ATA status register
814	* @drv_err: value contained in ATA error register
815	* @sk: the sense key we'll fill out
816	* @asc: the additional sense code we'll fill out
817	* @ascq: the additional sense code qualifier we'll fill out
818	* @verbose: be verbose
819	*
820	* Converts an ATA error into a SCSI error. Fill out pointers to
821	* SK, ASC, and ASCQ bytes for later use in fixed or descriptor
822	* format sense blocks.
823	*
824	* LOCKING:
825	* spin_lock_irqsave(host lock)
826	*/
827	static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
828	u8 asc, u8 ascq, int verbose)
829	{
830	int i;
831
832	/* Based on the 3ware driver translation table */
833	static const unsigned char sense_table[][4] = {
834	/* BBD\|ECC\|ID\|MAR */
835	{0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
836	/* BBD\|ECC\|ID */
837	{0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
838	/* ECC\|MC\|MARK */
839	{0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
840	/* ICRC\|ABRT / / NB: ICRC & !ABRT is BBD */
841	{0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
842	/* MC\|ID\|ABRT\|TRK0\|MARK */
843	{0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
844	/* MCR\|MARK */
845	{0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
846	/* Bad address mark */
847	{0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
848	/* TRK0 */
849	{0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
850	/* Abort & !ICRC */
851	{0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
852	/* Media change request */
853	{0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
854	/* SRV */
855	{0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
856	/* Media change */
857	{0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
858	/* ECC */
859	{0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
860	/* BBD - block marked bad */
861	{0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
862	{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
863	};
864	static const unsigned char stat_table[][4] = {
865	/* Must be first because BUSY means no other bits valid */
866	{0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
867	{0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
868	{0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
869	{0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
870	{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
871	};
872
873	/*
874	* Is this an error we can process/parse
875	*/
876	if (drv_stat & ATA_BUSY) {
877	drv_err = 0; /* Ignore the err bits, they're invalid */
878	}
879
880	if (drv_err) {
881	/* Look for drv_err */
882	for (i = 0; sense_table[i][0] != 0xFF; i++) {
883	/* Look for best matches first */
884	if ((sense_table[i][0] & drv_err) ==
885	sense_table[i][0]) {
886	*sk = sense_table[i][1];
887	*asc = sense_table[i][2];
888	*ascq = sense_table[i][3];
889	goto translate_done;
890	}
891	}
892	/* No immediate match */
893	if (verbose)
894	printk(KERN_WARNING "ata%u: no sense translation for "
895	"error 0x%02x\n", id, drv_err);
896	}
897
898	/* Fall back to interpreting status bits */
899	for (i = 0; stat_table[i][0] != 0xFF; i++) {
900	if (stat_table[i][0] & drv_stat) {
901	*sk = stat_table[i][1];
902	*asc = stat_table[i][2];
903	*ascq = stat_table[i][3];
904	goto translate_done;
905	}
906	}
907	/* No error? Undecoded? */
908	if (verbose)
909	printk(KERN_WARNING "ata%u: no sense translation for "
910	"status: 0x%02x\n", id, drv_stat);
911
912	/* We need a sensible error return here, which is tricky, and one
913	that won't cause people to do things like return a disk wrongly */
914	*sk = ABORTED_COMMAND;
915	*asc = 0x00;
916	*ascq = 0x00;
917
918	translate_done:
919	if (verbose)
920	printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
921	"to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
922	id, drv_stat, drv_err, sk, asc, *ascq);
923	return;
924	}
925
926	/*
927	* ata_gen_passthru_sense - Generate check condition sense block.
928	* @qc: Command that completed.
929	*
930	* This function is specific to the ATA descriptor format sense
931	* block specified for the ATA pass through commands. Regardless
932	* of whether the command errored or not, return a sense
933	* block. Copy all controller registers into the sense
934	* block. Clear sense key, ASC & ASCQ if there is no error.
935	*
936	* LOCKING:
937	* None.
938	*/
939	static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
940	{
941	struct scsi_cmnd *cmd = qc->scsicmd;
942	struct ata_taskfile *tf = &qc->result_tf;
943	unsigned char *sb = cmd->sense_buffer;
944	unsigned char *desc = sb + 8;
945	int verbose = qc->ap->ops->error_handler == NULL;
946
947	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
948
949	cmd->result = (DRIVER_SENSE << 24) \| SAM_STAT_CHECK_CONDITION;
950
951	/*
952	* Use ata_to_sense_error() to map status register bits
953	* onto sense key, asc & ascq.
954	*/
955	if (qc->err_mask \|\|
956	tf->command & (ATA_BUSY \| ATA_DF \| ATA_ERR \| ATA_DRQ)) {
957	ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
958	&sb[1], &sb[2], &sb[3], verbose);
959	sb[1] &= 0x0f;
960	}
961
962	/*
963	* Sense data is current and format is descriptor.
964	*/
965	sb[0] = 0x72;
966
967	desc[0] = 0x09;
968
969	/* set length of additional sense data */
970	sb[7] = 14;
971	desc[1] = 12;
972
973	/*
974	* Copy registers into sense buffer.
975	*/
976	desc[2] = 0x00;
977	desc[3] = tf->feature; /* == error reg */
978	desc[5] = tf->nsect;
979	desc[7] = tf->lbal;
980	desc[9] = tf->lbam;
981	desc[11] = tf->lbah;
982	desc[12] = tf->device;
983	desc[13] = tf->command; /* == status reg */
984
985	/*
986	* Fill in Extend bit, and the high order bytes
987	* if applicable.
988	*/
989	if (tf->flags & ATA_TFLAG_LBA48) {
990	desc[2] \|= 0x01;
991	desc[4] = tf->hob_nsect;
992	desc[6] = tf->hob_lbal;
993	desc[8] = tf->hob_lbam;
994	desc[10] = tf->hob_lbah;
995	}
996	}
997
998	/**
999	* ata_gen_ata_sense - generate a SCSI fixed sense block
1000	* @qc: Command that we are erroring out
1001	*
1002	* Generate sense block for a failed ATA command @qc. Descriptor
1003	* format is used to accommodate LBA48 block address.
1004	*
1005	* LOCKING:
1006	* None.
1007	*/
1008	static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
1009	{
1010	struct ata_device *dev = qc->dev;
1011	struct scsi_cmnd *cmd = qc->scsicmd;
1012	struct ata_taskfile *tf = &qc->result_tf;
1013	unsigned char *sb = cmd->sense_buffer;
1014	unsigned char *desc = sb + 8;
1015	int verbose = qc->ap->ops->error_handler == NULL;
1016	u64 block;
1017
1018	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1019
1020	cmd->result = (DRIVER_SENSE << 24) \| SAM_STAT_CHECK_CONDITION;
1021
1022	/* sense data is current and format is descriptor */
1023	sb[0] = 0x72;
1024
1025	/* Use ata_to_sense_error() to map status register bits
1026	* onto sense key, asc & ascq.
1027	*/
1028	if (qc->err_mask \|\|
1029	tf->command & (ATA_BUSY \| ATA_DF \| ATA_ERR \| ATA_DRQ)) {
1030	ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
1031	&sb[1], &sb[2], &sb[3], verbose);
1032	sb[1] &= 0x0f;
1033	}
1034
1035	block = ata_tf_read_block(&qc->result_tf, dev);
1036
1037	/* information sense data descriptor */
1038	sb[7] = 12;
1039	desc[0] = 0x00;
1040	desc[1] = 10;
1041
1042	desc[2] \|= 0x80; /* valid */
1043	desc[6] = block >> 40;
1044	desc[7] = block >> 32;
1045	desc[8] = block >> 24;
1046	desc[9] = block >> 16;
1047	desc[10] = block >> 8;
1048	desc[11] = block;
1049	}
1050
1051	static void ata_scsi_sdev_config(struct scsi_device *sdev)
1052	{
1053	sdev->use_10_for_rw = 1;
1054	sdev->use_10_for_ms = 1;
1055
1056	/* Schedule policy is determined by ->qc_defer() callback and
1057	* it needs to see every deferred qc. Set dev_blocked to 1 to
1058	* prevent SCSI midlayer from automatically deferring
1059	* requests.
1060	*/
1061	sdev->max_device_blocked = 1;
1062	}
1063
1064	/**
1065	* atapi_drain_needed - Check whether data transfer may overflow
1066	* @rq: request to be checked
1067	*
1068	* ATAPI commands which transfer variable length data to host
1069	* might overflow due to application error or hardare bug. This
1070	* function checks whether overflow should be drained and ignored
1071	* for @request.
1072	*
1073	* LOCKING:
1074	* None.
1075	*
1076	* RETURNS:
1077	* 1 if ; otherwise, 0.
1078	*/
1079	static int atapi_drain_needed(struct request *rq)
1080	{
1081	if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
1082	return 0;
1083
1084	if (!blk_rq_bytes(rq) \|\| (rq->cmd_flags & REQ_WRITE))
1085	return 0;
1086
1087	return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1088	}
1089
1090	static int ata_scsi_dev_config(struct scsi_device *sdev,
1091	struct ata_device *dev)
1092	{
1093	struct request_queue *q = sdev->request_queue;
1094
1095	if (!ata_id_has_unload(dev->id))
1096	dev->flags \|= ATA_DFLAG_NO_UNLOAD;
1097
1098	/* configure max sectors */
1099	blk_queue_max_hw_sectors(q, dev->max_sectors);
1100
1101	if (dev->class == ATA_DEV_ATAPI) {
1102	void *buf;
1103
1104	sdev->sector_size = ATA_SECT_SIZE;
1105
1106	/* set DMA padding */
1107	blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
1108
1109	/* configure draining */
1110	buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp \| GFP_KERNEL);
1111	if (!buf) {
1112	ata_dev_err(dev, "drain buffer allocation failed\n");
1113	return -ENOMEM;
1114	}
1115
1116	blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1117	} else {
1118	sdev->sector_size = ata_id_logical_sector_size(dev->id);
1119	sdev->manage_start_stop = 1;
1120	}
1121
1122	/*
1123	* ata_pio_sectors() expects buffer for each sector to not cross
1124	* page boundary. Enforce it by requiring buffers to be sector
1125	* aligned, which works iff sector_size is not larger than
1126	* PAGE_SIZE. ATAPI devices also need the alignment as
1127	* IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1128	*/
1129	if (sdev->sector_size > PAGE_SIZE)
1130	ata_dev_warn(dev,
1131	"sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1132	sdev->sector_size);
1133
1134	blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
1135
1136	if (dev->flags & ATA_DFLAG_AN)
1137	set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1138
1139	if (dev->flags & ATA_DFLAG_NCQ) {
1140	int depth;
1141
1142	depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1143	depth = min(ATA_MAX_QUEUE - 1, depth);
1144	scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
1145	}
1146
1147	blk_queue_flush_queueable(q, false);
1148
1149	dev->sdev = sdev;
1150	return 0;
1151	}
1152
1153	/**
1154	* ata_scsi_slave_config - Set SCSI device attributes
1155	* @sdev: SCSI device to examine
1156	*
1157	* This is called before we actually start reading
1158	* and writing to the device, to configure certain
1159	* SCSI mid-layer behaviors.
1160	*
1161	* LOCKING:
1162	* Defined by SCSI layer. We don't really care.
1163	*/
1164
1165	int ata_scsi_slave_config(struct scsi_device *sdev)
1166	{
1167	struct ata_port *ap = ata_shost_to_port(sdev->host);
1168	struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1169	int rc = 0;
1170
1171	ata_scsi_sdev_config(sdev);
1172
1173	if (dev)
1174	rc = ata_scsi_dev_config(sdev, dev);
1175
1176	return rc;
1177	}
1178
1179	/**
1180	* ata_scsi_slave_destroy - SCSI device is about to be destroyed
1181	* @sdev: SCSI device to be destroyed
1182	*
1183	* @sdev is about to be destroyed for hot/warm unplugging. If
1184	* this unplugging was initiated by libata as indicated by NULL
1185	* dev->sdev, this function doesn't have to do anything.
1186	* Otherwise, SCSI layer initiated warm-unplug is in progress.
1187	* Clear dev->sdev, schedule the device for ATA detach and invoke
1188	* EH.
1189	*
1190	* LOCKING:
1191	* Defined by SCSI layer. We don't really care.
1192	*/
1193	void ata_scsi_slave_destroy(struct scsi_device *sdev)
1194	{
1195	struct ata_port *ap = ata_shost_to_port(sdev->host);
1196	struct request_queue *q = sdev->request_queue;
1197	unsigned long flags;
1198	struct ata_device *dev;
1199
1200	if (!ap->ops->error_handler)
1201	return;
1202
1203	spin_lock_irqsave(ap->lock, flags);
1204	dev = __ata_scsi_find_dev(ap, sdev);
1205	if (dev && dev->sdev) {
1206	/* SCSI device already in CANCEL state, no need to offline it */
1207	dev->sdev = NULL;
1208	dev->flags \|= ATA_DFLAG_DETACH;
1209	ata_port_schedule_eh(ap);
1210	}
1211	spin_unlock_irqrestore(ap->lock, flags);
1212
1213	kfree(q->dma_drain_buffer);
1214	q->dma_drain_buffer = NULL;
1215	q->dma_drain_size = 0;
1216	}
1217
1218	/**
1219	* __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
1220	* @ap: ATA port to which the device change the queue depth
1221	* @sdev: SCSI device to configure queue depth for
1222	* @queue_depth: new queue depth
1223	* @reason: calling context
1224	*
1225	* libsas and libata have different approaches for associating a sdev to
1226	* its ata_port.
1227	*
1228	*/
1229	int __ata_change_queue_depth(struct ata_port ap, struct scsi_device sdev,
1230	int queue_depth, int reason)
1231	{
1232	struct ata_device *dev;
1233	unsigned long flags;
1234
1235	if (reason != SCSI_QDEPTH_DEFAULT)
1236	return -EOPNOTSUPP;
1237
1238	if (queue_depth < 1 \|\| queue_depth == sdev->queue_depth)
1239	return sdev->queue_depth;
1240
1241	dev = ata_scsi_find_dev(ap, sdev);
1242	if (!dev \|\| !ata_dev_enabled(dev))
1243	return sdev->queue_depth;
1244
1245	/* NCQ enabled? */
1246	spin_lock_irqsave(ap->lock, flags);
1247	dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1248	if (queue_depth == 1 \|\| !ata_ncq_enabled(dev)) {
1249	dev->flags \|= ATA_DFLAG_NCQ_OFF;
1250	queue_depth = 1;
1251	}
1252	spin_unlock_irqrestore(ap->lock, flags);
1253
1254	/* limit and apply queue depth */
1255	queue_depth = min(queue_depth, sdev->host->can_queue);
1256	queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1257	queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1258
1259	if (sdev->queue_depth == queue_depth)
1260	return -EINVAL;
1261
1262	scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
1263	return queue_depth;
1264	}
1265
1266	/**
1267	* ata_scsi_change_queue_depth - SCSI callback for queue depth config
1268	* @sdev: SCSI device to configure queue depth for
1269	* @queue_depth: new queue depth
1270	* @reason: calling context
1271	*
1272	* This is libata standard hostt->change_queue_depth callback.
1273	* SCSI will call into this callback when user tries to set queue
1274	* depth via sysfs.
1275	*
1276	* LOCKING:
1277	* SCSI layer (we don't care)
1278	*
1279	* RETURNS:
1280	* Newly configured queue depth.
1281	*/
1282	int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth,
1283	int reason)
1284	{
1285	struct ata_port *ap = ata_shost_to_port(sdev->host);
1286
1287	return __ata_change_queue_depth(ap, sdev, queue_depth, reason);
1288	}
1289
1290	/**
1291	* ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1292	* @qc: Storage for translated ATA taskfile
1293	*
1294	* Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1295	* (to start). Perhaps these commands should be preceded by
1296	* CHECK POWER MODE to see what power mode the device is already in.
1297	* [See SAT revision 5 at www.t10.org]
1298	*
1299	* LOCKING:
1300	* spin_lock_irqsave(host lock)
1301	*
1302	* RETURNS:
1303	* Zero on success, non-zero on error.
1304	*/
1305	static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1306	{
1307	struct scsi_cmnd *scmd = qc->scsicmd;
1308	struct ata_taskfile *tf = &qc->tf;
1309	const u8 *cdb = scmd->cmnd;
1310
1311	if (scmd->cmd_len < 5)
1312	goto invalid_fld;
1313
1314	tf->flags \|= ATA_TFLAG_DEVICE \| ATA_TFLAG_ISADDR;
1315	tf->protocol = ATA_PROT_NODATA;
1316	if (cdb[1] & 0x1) {
1317	; /* ignore IMMED bit, violates sat-r05 */
1318	}
1319	if (cdb[4] & 0x2)
1320	goto invalid_fld; /* LOEJ bit set not supported */
1321	if (((cdb[4] >> 4) & 0xf) != 0)
1322	goto invalid_fld; /* power conditions not supported */
1323
1324	if (cdb[4] & 0x1) {
1325	tf->nsect = 1; /* 1 sector, lba=0 */
1326
1327	if (qc->dev->flags & ATA_DFLAG_LBA) {
1328	tf->flags \|= ATA_TFLAG_LBA;
1329
1330	tf->lbah = 0x0;
1331	tf->lbam = 0x0;
1332	tf->lbal = 0x0;
1333	tf->device \|= ATA_LBA;
1334	} else {
1335	/* CHS */
1336	tf->lbal = 0x1; /* sect */
1337	tf->lbam = 0x0; /* cyl low */
1338	tf->lbah = 0x0; /* cyl high */
1339	}
1340
1341	tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
1342	} else {
1343	/* Some odd clown BIOSen issue spindown on power off (ACPI S4
1344	* or S5) causing some drives to spin up and down again.
1345	*/
1346	if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1347	system_state == SYSTEM_POWER_OFF)
1348	goto skip;
1349
1350	if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1351	system_entering_hibernation())
1352	goto skip;
1353
1354	/* Issue ATA STANDBY IMMEDIATE command */
1355	tf->command = ATA_CMD_STANDBYNOW1;
1356	}
1357
1358	/*
1359	* Standby and Idle condition timers could be implemented but that
1360	* would require libata to implement the Power condition mode page
1361	* and allow the user to change it. Changing mode pages requires
1362	* MODE SELECT to be implemented.
1363	*/
1364
1365	return 0;
1366
1367	invalid_fld:
1368	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1369	/* "Invalid field in cbd" */
1370	return 1;
1371	skip:
1372	scmd->result = SAM_STAT_GOOD;
1373	return 1;
1374	}
1375
1376
1377	/**
1378	* ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1379	* @qc: Storage for translated ATA taskfile
1380	*
1381	* Sets up an ATA taskfile to issue FLUSH CACHE or
1382	* FLUSH CACHE EXT.
1383	*
1384	* LOCKING:
1385	* spin_lock_irqsave(host lock)
1386	*
1387	* RETURNS:
1388	* Zero on success, non-zero on error.
1389	*/
1390	static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1391	{
1392	struct ata_taskfile *tf = &qc->tf;
1393
1394	tf->flags \|= ATA_TFLAG_DEVICE;
1395	tf->protocol = ATA_PROT_NODATA;
1396
1397	if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1398	tf->command = ATA_CMD_FLUSH_EXT;
1399	else
1400	tf->command = ATA_CMD_FLUSH;
1401
1402	/* flush is critical for IO integrity, consider it an IO command */
1403	qc->flags \|= ATA_QCFLAG_IO;
1404
1405	return 0;
1406	}
1407
1408	/**
1409	* scsi_6_lba_len - Get LBA and transfer length
1410	* @cdb: SCSI command to translate
1411	*
1412	* Calculate LBA and transfer length for 6-byte commands.
1413	*
1414	* RETURNS:
1415	* @plba: the LBA
1416	* @plen: the transfer length
1417	*/
1418	static void scsi_6_lba_len(const u8 cdb, u64 plba, u32 *plen)
1419	{
1420	u64 lba = 0;
1421	u32 len;
1422
1423	VPRINTK("six-byte command\n");
1424
1425	lba \|= ((u64)(cdb[1] & 0x1f)) << 16;
1426	lba \|= ((u64)cdb[2]) << 8;
1427	lba \|= ((u64)cdb[3]);
1428
1429	len = cdb[4];
1430
1431	*plba = lba;
1432	*plen = len;
1433	}
1434
1435	/**
1436	* scsi_10_lba_len - Get LBA and transfer length
1437	* @cdb: SCSI command to translate
1438	*
1439	* Calculate LBA and transfer length for 10-byte commands.
1440	*
1441	* RETURNS:
1442	* @plba: the LBA
1443	* @plen: the transfer length
1444	*/
1445	static void scsi_10_lba_len(const u8 cdb, u64 plba, u32 *plen)
1446	{
1447	u64 lba = 0;
1448	u32 len = 0;
1449
1450	VPRINTK("ten-byte command\n");
1451
1452	lba \|= ((u64)cdb[2]) << 24;
1453	lba \|= ((u64)cdb[3]) << 16;
1454	lba \|= ((u64)cdb[4]) << 8;
1455	lba \|= ((u64)cdb[5]);
1456
1457	len \|= ((u32)cdb[7]) << 8;
1458	len \|= ((u32)cdb[8]);
1459
1460	*plba = lba;
1461	*plen = len;
1462	}
1463
1464	/**
1465	* scsi_16_lba_len - Get LBA and transfer length
1466	* @cdb: SCSI command to translate
1467	*
1468	* Calculate LBA and transfer length for 16-byte commands.
1469	*
1470	* RETURNS:
1471	* @plba: the LBA
1472	* @plen: the transfer length
1473	*/
1474	static void scsi_16_lba_len(const u8 cdb, u64 plba, u32 *plen)
1475	{
1476	u64 lba = 0;
1477	u32 len = 0;
1478
1479	VPRINTK("sixteen-byte command\n");
1480
1481	lba \|= ((u64)cdb[2]) << 56;
1482	lba \|= ((u64)cdb[3]) << 48;
1483	lba \|= ((u64)cdb[4]) << 40;
1484	lba \|= ((u64)cdb[5]) << 32;
1485	lba \|= ((u64)cdb[6]) << 24;
1486	lba \|= ((u64)cdb[7]) << 16;
1487	lba \|= ((u64)cdb[8]) << 8;
1488	lba \|= ((u64)cdb[9]);
1489
1490	len \|= ((u32)cdb[10]) << 24;
1491	len \|= ((u32)cdb[11]) << 16;
1492	len \|= ((u32)cdb[12]) << 8;
1493	len \|= ((u32)cdb[13]);
1494
1495	*plba = lba;
1496	*plen = len;
1497	}
1498
1499	/**
1500	* ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1501	* @qc: Storage for translated ATA taskfile
1502	*
1503	* Converts SCSI VERIFY command to an ATA READ VERIFY command.
1504	*
1505	* LOCKING:
1506	* spin_lock_irqsave(host lock)
1507	*
1508	* RETURNS:
1509	* Zero on success, non-zero on error.
1510	*/
1511	static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1512	{
1513	struct scsi_cmnd *scmd = qc->scsicmd;
1514	struct ata_taskfile *tf = &qc->tf;
1515	struct ata_device *dev = qc->dev;
1516	u64 dev_sectors = qc->dev->n_sectors;
1517	const u8 *cdb = scmd->cmnd;
1518	u64 block;
1519	u32 n_block;
1520
1521	tf->flags \|= ATA_TFLAG_ISADDR \| ATA_TFLAG_DEVICE;
1522	tf->protocol = ATA_PROT_NODATA;
1523
1524	if (cdb[0] == VERIFY) {
1525	if (scmd->cmd_len < 10)
1526	goto invalid_fld;
1527	scsi_10_lba_len(cdb, &block, &n_block);
1528	} else if (cdb[0] == VERIFY_16) {
1529	if (scmd->cmd_len < 16)
1530	goto invalid_fld;
1531	scsi_16_lba_len(cdb, &block, &n_block);
1532	} else
1533	goto invalid_fld;
1534
1535	if (!n_block)
1536	goto nothing_to_do;
1537	if (block >= dev_sectors)
1538	goto out_of_range;
1539	if ((block + n_block) > dev_sectors)
1540	goto out_of_range;
1541
1542	if (dev->flags & ATA_DFLAG_LBA) {
1543	tf->flags \|= ATA_TFLAG_LBA;
1544
1545	if (lba_28_ok(block, n_block)) {
1546	/* use LBA28 */
1547	tf->command = ATA_CMD_VERIFY;
1548	tf->device \|= (block >> 24) & 0xf;
1549	} else if (lba_48_ok(block, n_block)) {
1550	if (!(dev->flags & ATA_DFLAG_LBA48))
1551	goto out_of_range;
1552
1553	/* use LBA48 */
1554	tf->flags \|= ATA_TFLAG_LBA48;
1555	tf->command = ATA_CMD_VERIFY_EXT;
1556
1557	tf->hob_nsect = (n_block >> 8) & 0xff;
1558
1559	tf->hob_lbah = (block >> 40) & 0xff;
1560	tf->hob_lbam = (block >> 32) & 0xff;
1561	tf->hob_lbal = (block >> 24) & 0xff;
1562	} else
1563	/* request too large even for LBA48 */
1564	goto out_of_range;
1565
1566	tf->nsect = n_block & 0xff;
1567
1568	tf->lbah = (block >> 16) & 0xff;
1569	tf->lbam = (block >> 8) & 0xff;
1570	tf->lbal = block & 0xff;
1571
1572	tf->device \|= ATA_LBA;
1573	} else {
1574	/* CHS */
1575	u32 sect, head, cyl, track;
1576
1577	if (!lba_28_ok(block, n_block))
1578	goto out_of_range;
1579
1580	/* Convert LBA to CHS */
1581	track = (u32)block / dev->sectors;
1582	cyl = track / dev->heads;
1583	head = track % dev->heads;
1584	sect = (u32)block % dev->sectors + 1;
1585
1586	DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1587	(u32)block, track, cyl, head, sect);
1588
1589	/* Check whether the converted CHS can fit.
1590	Cylinder: 0-65535
1591	Head: 0-15
1592	Sector: 1-255*/
1593	if ((cyl >> 16) \|\| (head >> 4) \|\| (sect >> 8) \|\| (!sect))
1594	goto out_of_range;
1595
1596	tf->command = ATA_CMD_VERIFY;
1597	tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1598	tf->lbal = sect;
1599	tf->lbam = cyl;
1600	tf->lbah = cyl >> 8;
1601	tf->device \|= head;
1602	}
1603
1604	return 0;
1605
1606	invalid_fld:
1607	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1608	/* "Invalid field in cbd" */
1609	return 1;
1610
1611	out_of_range:
1612	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1613	/* "Logical Block Address out of range" */
1614	return 1;
1615
1616	nothing_to_do:
1617	scmd->result = SAM_STAT_GOOD;
1618	return 1;
1619	}
1620
1621	/**
1622	* ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1623	* @qc: Storage for translated ATA taskfile
1624	*
1625	* Converts any of six SCSI read/write commands into the
1626	* ATA counterpart, including starting sector (LBA),
1627	* sector count, and taking into account the device's LBA48
1628	* support.
1629	*
1630	* Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1631	* %WRITE_16 are currently supported.
1632	*
1633	* LOCKING:
1634	* spin_lock_irqsave(host lock)
1635	*
1636	* RETURNS:
1637	* Zero on success, non-zero on error.
1638	*/
1639	static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1640	{
1641	struct scsi_cmnd *scmd = qc->scsicmd;
1642	const u8 *cdb = scmd->cmnd;
1643	unsigned int tf_flags = 0;
1644	u64 block;
1645	u32 n_block;
1646	int rc;
1647
1648	if (cdb[0] == WRITE_10 \|\| cdb[0] == WRITE_6 \|\| cdb[0] == WRITE_16)
1649	tf_flags \|= ATA_TFLAG_WRITE;
1650
1651	/* Calculate the SCSI LBA, transfer length and FUA. */
1652	switch (cdb[0]) {
1653	case READ_10:
1654	case WRITE_10:
1655	if (unlikely(scmd->cmd_len < 10))
1656	goto invalid_fld;
1657	scsi_10_lba_len(cdb, &block, &n_block);
1658	if (unlikely(cdb[1] & (1 << 3)))
1659	tf_flags \|= ATA_TFLAG_FUA;
1660	break;
1661	case READ_6:
1662	case WRITE_6:
1663	if (unlikely(scmd->cmd_len < 6))
1664	goto invalid_fld;
1665	scsi_6_lba_len(cdb, &block, &n_block);
1666
1667	/* for 6-byte r/w commands, transfer length 0
1668	* means 256 blocks of data, not 0 block.
1669	*/
1670	if (!n_block)
1671	n_block = 256;
1672	break;
1673	case READ_16:
1674	case WRITE_16:
1675	if (unlikely(scmd->cmd_len < 16))
1676	goto invalid_fld;
1677	scsi_16_lba_len(cdb, &block, &n_block);
1678	if (unlikely(cdb[1] & (1 << 3)))
1679	tf_flags \|= ATA_TFLAG_FUA;
1680	break;
1681	default:
1682	DPRINTK("no-byte command\n");
1683	goto invalid_fld;
1684	}
1685
1686	/* Check and compose ATA command */
1687	if (!n_block)
1688	/* For 10-byte and 16-byte SCSI R/W commands, transfer
1689	* length 0 means transfer 0 block of data.
1690	* However, for ATA R/W commands, sector count 0 means
1691	* 256 or 65536 sectors, not 0 sectors as in SCSI.
1692	*
1693	* WARNING: one or two older ATA drives treat 0 as 0...
1694	*/
1695	goto nothing_to_do;
1696
1697	qc->flags \|= ATA_QCFLAG_IO;
1698	qc->nbytes = n_block * scmd->device->sector_size;
1699
1700	rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1701	qc->tag);
1702	if (likely(rc == 0))
1703	return 0;
1704
1705	if (rc == -ERANGE)
1706	goto out_of_range;
1707	/* treat all other errors as -EINVAL, fall through */
1708	invalid_fld:
1709	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1710	/* "Invalid field in cbd" */
1711	return 1;
1712
1713	out_of_range:
1714	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1715	/* "Logical Block Address out of range" */
1716	return 1;
1717
1718	nothing_to_do:
1719	scmd->result = SAM_STAT_GOOD;
1720	return 1;
1721	}
1722
1723	static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1724	{
1725	struct ata_port *ap = qc->ap;
1726	struct scsi_cmnd *cmd = qc->scsicmd;
1727	u8 *cdb = cmd->cmnd;
1728	int need_sense = (qc->err_mask != 0);
1729
1730	/* For ATA pass thru (SAT) commands, generate a sense block if
1731	* user mandated it or if there's an error. Note that if we
1732	* generate because the user forced us to, a check condition
1733	* is generated and the ATA register values are returned
1734	* whether the command completed successfully or not. If there
1735	* was no error, SK, ASC and ASCQ will all be zero.
1736	*/
1737	if (((cdb[0] == ATA_16) \|\| (cdb[0] == ATA_12)) &&
1738	((cdb[2] & 0x20) \|\| need_sense)) {
1739	ata_gen_passthru_sense(qc);
1740	} else {
1741	if (!need_sense) {
1742	cmd->result = SAM_STAT_GOOD;
1743	} else {
1744	/* TODO: decide which descriptor format to use
1745	* for 48b LBA devices and call that here
1746	* instead of the fixed desc, which is only
1747	* good for smaller LBA (and maybe CHS?)
1748	* devices.
1749	*/
1750	ata_gen_ata_sense(qc);
1751	}
1752	}
1753
1754	if (need_sense && !ap->ops->error_handler)
1755	ata_dump_status(ap->print_id, &qc->result_tf);
1756
1757	qc->scsidone(cmd);
1758
1759	ata_qc_free(qc);
1760	}
1761
1762	/**
1763	* ata_scsi_translate - Translate then issue SCSI command to ATA device
1764	* @dev: ATA device to which the command is addressed
1765	* @cmd: SCSI command to execute
1766	* @xlat_func: Actor which translates @cmd to an ATA taskfile
1767	*
1768	* Our ->queuecommand() function has decided that the SCSI
1769	* command issued can be directly translated into an ATA
1770	* command, rather than handled internally.
1771	*
1772	* This function sets up an ata_queued_cmd structure for the
1773	* SCSI command, and sends that ata_queued_cmd to the hardware.
1774	*
1775	* The xlat_func argument (actor) returns 0 if ready to execute
1776	* ATA command, else 1 to finish translation. If 1 is returned
1777	* then cmd->result (and possibly cmd->sense_buffer) are assumed
1778	* to be set reflecting an error condition or clean (early)
1779	* termination.
1780	*
1781	* LOCKING:
1782	* spin_lock_irqsave(host lock)
1783	*
1784	* RETURNS:
1785	* 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1786	* needs to be deferred.
1787	*/
1788	static int ata_scsi_translate(struct ata_device dev, struct scsi_cmnd cmd,
1789	ata_xlat_func_t xlat_func)
1790	{
1791	struct ata_port *ap = dev->link->ap;
1792	struct ata_queued_cmd *qc;
1793	int rc;
1794
1795	VPRINTK("ENTER\n");
1796
1797	qc = ata_scsi_qc_new(dev, cmd);
1798	if (!qc)
1799	goto err_mem;
1800
1801	/* data is present; dma-map it */
1802	if (cmd->sc_data_direction == DMA_FROM_DEVICE \|\|
1803	cmd->sc_data_direction == DMA_TO_DEVICE) {
1804	if (unlikely(scsi_bufflen(cmd) < 1)) {
1805	ata_dev_warn(dev, "WARNING: zero len r/w req\n");
1806	goto err_did;
1807	}
1808
1809	ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1810
1811	qc->dma_dir = cmd->sc_data_direction;
1812	}
1813
1814	qc->complete_fn = ata_scsi_qc_complete;
1815
1816	if (xlat_func(qc))
1817	goto early_finish;
1818
1819	if (ap->ops->qc_defer) {
1820	if ((rc = ap->ops->qc_defer(qc)))
1821	goto defer;
1822	}
1823
1824	/* select device, send command to hardware */
1825	ata_qc_issue(qc);
1826
1827	VPRINTK("EXIT\n");
1828	return 0;
1829
1830	early_finish:
1831	ata_qc_free(qc);
1832	cmd->scsi_done(cmd);
1833	DPRINTK("EXIT - early finish (good or error)\n");
1834	return 0;
1835
1836	err_did:
1837	ata_qc_free(qc);
1838	cmd->result = (DID_ERROR << 16);
1839	cmd->scsi_done(cmd);
1840	err_mem:
1841	DPRINTK("EXIT - internal\n");
1842	return 0;
1843
1844	defer:
1845	ata_qc_free(qc);
1846	DPRINTK("EXIT - defer\n");
1847	if (rc == ATA_DEFER_LINK)
1848	return SCSI_MLQUEUE_DEVICE_BUSY;
1849	else
1850	return SCSI_MLQUEUE_HOST_BUSY;
1851	}
1852
1853	/**
1854	* ata_scsi_rbuf_get - Map response buffer.
1855	* @cmd: SCSI command containing buffer to be mapped.
1856	* @flags: unsigned long variable to store irq enable status
1857	* @copy_in: copy in from user buffer
1858	*
1859	* Prepare buffer for simulated SCSI commands.
1860	*
1861	* LOCKING:
1862	* spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1863	*
1864	* RETURNS:
1865	* Pointer to response buffer.
1866	*/
1867	static void ata_scsi_rbuf_get(struct scsi_cmnd cmd, bool copy_in,
1868	unsigned long *flags)
1869	{
1870	spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1871
1872	memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1873	if (copy_in)
1874	sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1875	ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1876	return ata_scsi_rbuf;
1877	}
1878
1879	/**
1880	* ata_scsi_rbuf_put - Unmap response buffer.
1881	* @cmd: SCSI command containing buffer to be unmapped.
1882	* @copy_out: copy out result
1883	* @flags: @flags passed to ata_scsi_rbuf_get()
1884	*
1885	* Returns rbuf buffer. The result is copied to @cmd's buffer if
1886	* @copy_back is true.
1887	*
1888	* LOCKING:
1889	* Unlocks ata_scsi_rbuf_lock.
1890	*/
1891	static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1892	unsigned long *flags)
1893	{
1894	if (copy_out)
1895	sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1896	ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1897	spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1898	}
1899
1900	/**
1901	* ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1902	* @args: device IDENTIFY data / SCSI command of interest.
1903	* @actor: Callback hook for desired SCSI command simulator
1904	*
1905	* Takes care of the hard work of simulating a SCSI command...
1906	* Mapping the response buffer, calling the command's handler,
1907	* and handling the handler's return value. This return value
1908	* indicates whether the handler wishes the SCSI command to be
1909	* completed successfully (0), or not (in which case cmd->result
1910	* and sense buffer are assumed to be set).
1911	*
1912	* LOCKING:
1913	* spin_lock_irqsave(host lock)
1914	*/
1915	static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1916	unsigned int (actor)(struct ata_scsi_args args, u8 *rbuf))
1917	{
1918	u8 *rbuf;
1919	unsigned int rc;
1920	struct scsi_cmnd *cmd = args->cmd;
1921	unsigned long flags;
1922
1923	rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1924	rc = actor(args, rbuf);
1925	ata_scsi_rbuf_put(cmd, rc == 0, &flags);
1926
1927	if (rc == 0)
1928	cmd->result = SAM_STAT_GOOD;
1929	args->done(cmd);
1930	}
1931
1932	/**
1933	* ata_scsiop_inq_std - Simulate INQUIRY command
1934	* @args: device IDENTIFY data / SCSI command of interest.
1935	* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1936	*
1937	* Returns standard device identification data associated
1938	* with non-VPD INQUIRY command output.
1939	*
1940	* LOCKING:
1941	* spin_lock_irqsave(host lock)
1942	*/
1943	static unsigned int ata_scsiop_inq_std(struct ata_scsi_args args, u8 rbuf)
1944	{
1945	const u8 versions[] = {
1946	0x60, /* SAM-3 (no version claimed) */
1947
1948	0x03,
1949	0x20, /* SBC-2 (no version claimed) */
1950
1951	0x02,
1952	0x60 /* SPC-3 (no version claimed) */
1953	};
1954	u8 hdr[] = {
1955	TYPE_DISK,
1956	0,
1957	0x5, /* claim SPC-3 version compatibility */
1958	2,
1959	95 - 4
1960	};
1961
1962	VPRINTK("ENTER\n");
1963
1964	/* set scsi removeable (RMB) bit per ata bit */
1965	if (ata_id_removeable(args->id))
1966	hdr[1] \|= (1 << 7);
1967
1968	memcpy(rbuf, hdr, sizeof(hdr));
1969	memcpy(&rbuf[8], "ATA ", 8);
1970	ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1971	ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1972
1973	if (rbuf[32] == 0 \|\| rbuf[32] == ' ')
1974	memcpy(&rbuf[32], "n/a ", 4);
1975
1976	memcpy(rbuf + 59, versions, sizeof(versions));
1977
1978	return 0;
1979	}
1980
1981	/**
1982	* ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1983	* @args: device IDENTIFY data / SCSI command of interest.
1984	* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1985	*
1986	* Returns list of inquiry VPD pages available.
1987	*
1988	* LOCKING:
1989	* spin_lock_irqsave(host lock)
1990	*/
1991	static unsigned int ata_scsiop_inq_00(struct ata_scsi_args args, u8 rbuf)
1992	{
1993	const u8 pages[] = {
1994	0x00, /* page 0x00, this page */
1995	0x80, /* page 0x80, unit serial no page */
1996	0x83, /* page 0x83, device ident page */
1997	0x89, /* page 0x89, ata info page */
1998	0xb0, /* page 0xb0, block limits page */
1999	0xb1, /* page 0xb1, block device characteristics page */
2000	0xb2, /* page 0xb2, thin provisioning page */
2001	};
2002
2003	rbuf[3] = sizeof(pages); /* number of supported VPD pages */
2004	memcpy(rbuf + 4, pages, sizeof(pages));
2005	return 0;
2006	}
2007
2008	/**
2009	* ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
2010	* @args: device IDENTIFY data / SCSI command of interest.
2011	* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2012	*
2013	* Returns ATA device serial number.
2014	*
2015	* LOCKING:
2016	* spin_lock_irqsave(host lock)
2017	*/
2018	static unsigned int ata_scsiop_inq_80(struct ata_scsi_args args, u8 rbuf)
2019	{
2020	const u8 hdr[] = {
2021	0,
2022	0x80, /* this page code */
2023	0,
2024	ATA_ID_SERNO_LEN, /* page len */
2025	};
2026
2027	memcpy(rbuf, hdr, sizeof(hdr));
2028	ata_id_string(args->id, (unsigned char *) &rbuf[4],
2029	ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2030	return 0;
2031	}
2032
2033	/**
2034	* ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2035	* @args: device IDENTIFY data / SCSI command of interest.
2036	* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2037	*
2038	* Yields two logical unit device identification designators:
2039	* - vendor specific ASCII containing the ATA serial number
2040	* - SAT defined "t10 vendor id based" containing ASCII vendor
2041	* name ("ATA "), model and serial numbers.
2042	*
2043	* LOCKING:
2044	* spin_lock_irqsave(host lock)
2045	*/
2046	static unsigned int ata_scsiop_inq_83(struct ata_scsi_args args, u8 rbuf)
2047	{
2048	const int sat_model_serial_desc_len = 68;
2049	int num;
2050
2051	rbuf[1] = 0x83; /* this page code */
2052	num = 4;
2053
2054	/* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2055	rbuf[num + 0] = 2;
2056	rbuf[num + 3] = ATA_ID_SERNO_LEN;
2057	num += 4;
2058	ata_id_string(args->id, (unsigned char *) rbuf + num,
2059	ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2060	num += ATA_ID_SERNO_LEN;
2061
2062	/* SAT defined lu model and serial numbers descriptor */
2063	/* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2064	rbuf[num + 0] = 2;
2065	rbuf[num + 1] = 1;
2066	rbuf[num + 3] = sat_model_serial_desc_len;
2067	num += 4;
2068	memcpy(rbuf + num, "ATA ", 8);
2069	num += 8;
2070	ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2071	ATA_ID_PROD_LEN);
2072	num += ATA_ID_PROD_LEN;
2073	ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2074	ATA_ID_SERNO_LEN);
2075	num += ATA_ID_SERNO_LEN;
2076
2077	if (ata_id_has_wwn(args->id)) {
2078	/* SAT defined lu world wide name */
2079	/* piv=0, assoc=lu, code_set=binary, designator=NAA */
2080	rbuf[num + 0] = 1;
2081	rbuf[num + 1] = 3;
2082	rbuf[num + 3] = ATA_ID_WWN_LEN;
2083	num += 4;
2084	ata_id_string(args->id, (unsigned char *) rbuf + num,
2085	ATA_ID_WWN, ATA_ID_WWN_LEN);
2086	num += ATA_ID_WWN_LEN;
2087	}
2088	rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
2089	return 0;
2090	}
2091
2092	/**
2093	* ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2094	* @args: device IDENTIFY data / SCSI command of interest.
2095	* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2096	*
2097	* Yields SAT-specified ATA VPD page.
2098	*
2099	* LOCKING:
2100	* spin_lock_irqsave(host lock)
2101	*/
2102	static unsigned int ata_scsiop_inq_89(struct ata_scsi_args args, u8 rbuf)
2103	{
2104	struct ata_taskfile tf;
2105
2106	memset(&tf, 0, sizeof(tf));
2107
2108	rbuf[1] = 0x89; /* our page code */
2109	rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2110	rbuf[3] = (0x238 & 0xff);
2111
2112	memcpy(&rbuf[8], "linux ", 8);
2113	memcpy(&rbuf[16], "libata ", 16);
2114	memcpy(&rbuf[32], DRV_VERSION, 4);
2115	ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
2116
2117	/* we don't store the ATA device signature, so we fake it */
2118
2119	tf.command = ATA_DRDY; /* really, this is Status reg */
2120	tf.lbal = 0x1;
2121	tf.nsect = 0x1;
2122
2123	ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2124	rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
2125
2126	rbuf[56] = ATA_CMD_ID_ATA;
2127
2128	memcpy(&rbuf[60], &args->id[0], 512);
2129	return 0;
2130	}
2131
2132	static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args args, u8 rbuf)
2133	{
2134	u16 min_io_sectors;
2135
2136	rbuf[1] = 0xb0;
2137	rbuf[3] = 0x3c; /* required VPD size with unmap support */
2138
2139	/*
2140	* Optimal transfer length granularity.
2141	*
2142	* This is always one physical block, but for disks with a smaller
2143	* logical than physical sector size we need to figure out what the
2144	* latter is.
2145	*/
2146	min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
2147	put_unaligned_be16(min_io_sectors, &rbuf[6]);
2148
2149	/*
2150	* Optimal unmap granularity.
2151	*
2152	* The ATA spec doesn't even know about a granularity or alignment
2153	* for the TRIM command. We can leave away most of the unmap related
2154	* VPD page entries, but we have specifify a granularity to signal
2155	* that we support some form of unmap - in thise case via WRITE SAME
2156	* with the unmap bit set.
2157	*/
2158	if (ata_id_has_trim(args->id)) {
2159	put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
2160	put_unaligned_be32(1, &rbuf[28]);
2161	}
2162
2163	return 0;
2164	}
2165
2166	static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args args, u8 rbuf)
2167	{
2168	int form_factor = ata_id_form_factor(args->id);
2169	int media_rotation_rate = ata_id_rotation_rate(args->id);
2170
2171	rbuf[1] = 0xb1;
2172	rbuf[3] = 0x3c;
2173	rbuf[4] = media_rotation_rate >> 8;
2174	rbuf[5] = media_rotation_rate;
2175	rbuf[7] = form_factor;
2176
2177	return 0;
2178	}
2179
2180	static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args args, u8 rbuf)
2181	{
2182	/* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2183	rbuf[1] = 0xb2;
2184	rbuf[3] = 0x4;
2185	rbuf[5] = 1 << 6; /* TPWS */
2186
2187	return 0;
2188	}
2189
2190	/**
2191	* ata_scsiop_noop - Command handler that simply returns success.
2192	* @args: device IDENTIFY data / SCSI command of interest.
2193	* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2194	*
2195	* No operation. Simply returns success to caller, to indicate
2196	* that the caller should successfully complete this SCSI command.
2197	*
2198	* LOCKING:
2199	* spin_lock_irqsave(host lock)
2200	*/
2201	static unsigned int ata_scsiop_noop(struct ata_scsi_args args, u8 rbuf)
2202	{
2203	VPRINTK("ENTER\n");
2204	return 0;
2205	}
2206
2207	/**
2208	* ata_msense_caching - Simulate MODE SENSE caching info page
2209	* @id: device IDENTIFY data
2210	* @buf: output buffer
2211	*
2212	* Generate a caching info page, which conditionally indicates
2213	* write caching to the SCSI layer, depending on device
2214	* capabilities.
2215	*
2216	* LOCKING:
2217	* None.
2218	*/
2219	static unsigned int ata_msense_caching(u16 id, u8 buf)
2220	{
2221	memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage));
2222	if (ata_id_wcache_enabled(id))
2223	buf[2] \|= (1 << 2); /* write cache enable */
2224	if (!ata_id_rahead_enabled(id))
2225	buf[12] \|= (1 << 5); /* disable read ahead */
2226	return sizeof(def_cache_mpage);
2227	}
2228
2229	/**
2230	* ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2231	* @buf: output buffer
2232	*
2233	* Generate a generic MODE SENSE control mode page.
2234	*
2235	* LOCKING:
2236	* None.
2237	*/
2238	static unsigned int ata_msense_ctl_mode(u8 *buf)
2239	{
2240	memcpy(buf, def_control_mpage, sizeof(def_control_mpage));
2241	return sizeof(def_control_mpage);
2242	}
2243
2244	/**
2245	* ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2246	* @buf: output buffer
2247	*
2248	* Generate a generic MODE SENSE r/w error recovery page.
2249	*
2250	* LOCKING:
2251	* None.
2252	*/
2253	static unsigned int ata_msense_rw_recovery(u8 *buf)
2254	{
2255	memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage));
2256	return sizeof(def_rw_recovery_mpage);
2257	}
2258
2259	/*
2260	* We can turn this into a real blacklist if it's needed, for now just
2261	* blacklist any Maxtor BANC1G10 revision firmware
2262	*/
2263	static int ata_dev_supports_fua(u16 *id)
2264	{
2265	unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2266
2267	if (!libata_fua)
2268	return 0;
2269	if (!ata_id_has_fua(id))
2270	return 0;
2271
2272	ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2273	ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2274
2275	if (strcmp(model, "Maxtor"))
2276	return 1;
2277	if (strcmp(fw, "BANC1G10"))
2278	return 1;
2279
2280	return 0; /* blacklisted */
2281	}
2282
2283	/**
2284	* ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2285	* @args: device IDENTIFY data / SCSI command of interest.
2286	* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2287	*
2288	* Simulate MODE SENSE commands. Assume this is invoked for direct
2289	* access devices (e.g. disks) only. There should be no block
2290	* descriptor for other device types.
2291	*
2292	* LOCKING:
2293	* spin_lock_irqsave(host lock)
2294	*/
2295	static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args args, u8 rbuf)
2296	{
2297	struct ata_device *dev = args->dev;
2298	u8 scsicmd = args->cmd->cmnd, p = rbuf;
2299	const u8 sat_blk_desc[] = {
2300	0, 0, 0, 0, /* number of blocks: sat unspecified */
2301	0,
2302	0, 0x2, 0x0 /* block length: 512 bytes */
2303	};
2304	u8 pg, spg;
2305	unsigned int ebd, page_control, six_byte;
2306	u8 dpofua;
2307
2308	VPRINTK("ENTER\n");
2309
2310	six_byte = (scsicmd[0] == MODE_SENSE);
2311	ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2312	/*
2313	* LLBA bit in msense(10) ignored (compliant)
2314	*/
2315
2316	page_control = scsicmd[2] >> 6;
2317	switch (page_control) {
2318	case 0: /* current */
2319	break; /* supported */
2320	case 3: /* saved */
2321	goto saving_not_supp;
2322	case 1: /* changeable */
2323	case 2: /* defaults */
2324	default:
2325	goto invalid_fld;
2326	}
2327
2328	if (six_byte)
2329	p += 4 + (ebd ? 8 : 0);
2330	else
2331	p += 8 + (ebd ? 8 : 0);
2332
2333	pg = scsicmd[2] & 0x3f;
2334	spg = scsicmd[3];
2335	/*
2336	* No mode subpages supported (yet) but asking for _all_
2337	* subpages may be valid
2338	*/
2339	if (spg && (spg != ALL_SUB_MPAGES))
2340	goto invalid_fld;
2341
2342	switch(pg) {
2343	case RW_RECOVERY_MPAGE:
2344	p += ata_msense_rw_recovery(p);
2345	break;
2346
2347	case CACHE_MPAGE:
2348	p += ata_msense_caching(args->id, p);
2349	break;
2350
2351	case CONTROL_MPAGE:
2352	p += ata_msense_ctl_mode(p);
2353	break;
2354
2355	case ALL_MPAGES:
2356	p += ata_msense_rw_recovery(p);
2357	p += ata_msense_caching(args->id, p);
2358	p += ata_msense_ctl_mode(p);
2359	break;
2360
2361	default: /* invalid page code */
2362	goto invalid_fld;
2363	}
2364
2365	dpofua = 0;
2366	if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2367	(!(dev->flags & ATA_DFLAG_PIO) \|\| dev->multi_count))
2368	dpofua = 1 << 4;
2369
2370	if (six_byte) {
2371	rbuf[0] = p - rbuf - 1;
2372	rbuf[2] \|= dpofua;
2373	if (ebd) {
2374	rbuf[3] = sizeof(sat_blk_desc);
2375	memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2376	}
2377	} else {
2378	unsigned int output_len = p - rbuf - 2;
2379
2380	rbuf[0] = output_len >> 8;
2381	rbuf[1] = output_len;
2382	rbuf[3] \|= dpofua;
2383	if (ebd) {
2384	rbuf[7] = sizeof(sat_blk_desc);
2385	memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2386	}
2387	}
2388	return 0;
2389
2390	invalid_fld:
2391	ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2392	/* "Invalid field in cbd" */
2393	return 1;
2394
2395	saving_not_supp:
2396	ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2397	/* "Saving parameters not supported" */
2398	return 1;
2399	}
2400
2401	/**
2402	* ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2403	* @args: device IDENTIFY data / SCSI command of interest.
2404	* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2405	*
2406	* Simulate READ CAPACITY commands.
2407	*
2408	* LOCKING:
2409	* None.
2410	*/
2411	static unsigned int ata_scsiop_read_cap(struct ata_scsi_args args, u8 rbuf)
2412	{
2413	struct ata_device *dev = args->dev;
2414	u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
2415	u32 sector_size; /* physical sector size in bytes */
2416	u8 log2_per_phys;
2417	u16 lowest_aligned;
2418
2419	sector_size = ata_id_logical_sector_size(dev->id);
2420	log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2421	lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
2422
2423	VPRINTK("ENTER\n");
2424
2425	if (args->cmd->cmnd[0] == READ_CAPACITY) {
2426	if (last_lba >= 0xffffffffULL)
2427	last_lba = 0xffffffff;
2428
2429	/* sector count, 32-bit */
2430	rbuf[0] = last_lba >> (8 * 3);
2431	rbuf[1] = last_lba >> (8 * 2);
2432	rbuf[2] = last_lba >> (8 * 1);
2433	rbuf[3] = last_lba;
2434
2435	/* sector size */
2436	rbuf[4] = sector_size >> (8 * 3);
2437	rbuf[5] = sector_size >> (8 * 2);
2438	rbuf[6] = sector_size >> (8 * 1);
2439	rbuf[7] = sector_size;
2440	} else {
2441	/* sector count, 64-bit */
2442	rbuf[0] = last_lba >> (8 * 7);
2443	rbuf[1] = last_lba >> (8 * 6);
2444	rbuf[2] = last_lba >> (8 * 5);
2445	rbuf[3] = last_lba >> (8 * 4);
2446	rbuf[4] = last_lba >> (8 * 3);
2447	rbuf[5] = last_lba >> (8 * 2);
2448	rbuf[6] = last_lba >> (8 * 1);
2449	rbuf[7] = last_lba;
2450
2451	/* sector size */
2452	rbuf[ 8] = sector_size >> (8 * 3);
2453	rbuf[ 9] = sector_size >> (8 * 2);
2454	rbuf[10] = sector_size >> (8 * 1);
2455	rbuf[11] = sector_size;
2456
2457	rbuf[12] = 0;
2458	rbuf[13] = log2_per_phys;
2459	rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2460	rbuf[15] = lowest_aligned;
2461
2462	if (ata_id_has_trim(args->id)) {
2463	rbuf[14] \|= 0x80; /* TPE */
2464
2465	if (ata_id_has_zero_after_trim(args->id))
2466	rbuf[14] \|= 0x40; /* TPRZ */
2467	}
2468	}
2469
2470	return 0;
2471	}
2472
2473	/**
2474	* ata_scsiop_report_luns - Simulate REPORT LUNS command
2475	* @args: device IDENTIFY data / SCSI command of interest.
2476	* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2477	*
2478	* Simulate REPORT LUNS command.
2479	*
2480	* LOCKING:
2481	* spin_lock_irqsave(host lock)
2482	*/
2483	static unsigned int ata_scsiop_report_luns(struct ata_scsi_args args, u8 rbuf)
2484	{
2485	VPRINTK("ENTER\n");
2486	rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2487
2488	return 0;
2489	}
2490
2491	static void atapi_sense_complete(struct ata_queued_cmd *qc)
2492	{
2493	if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2494	/* FIXME: not quite right; we don't want the
2495	* translation of taskfile registers into
2496	* a sense descriptors, since that's only
2497	* correct for ATA, not ATAPI
2498	*/
2499	ata_gen_passthru_sense(qc);
2500	}
2501
2502	qc->scsidone(qc->scsicmd);
2503	ata_qc_free(qc);
2504	}
2505
2506	/* is it pointless to prefer PIO for "safety reasons"? */
2507	static inline int ata_pio_use_silly(struct ata_port *ap)
2508	{
2509	return (ap->flags & ATA_FLAG_PIO_DMA);
2510	}
2511
2512	static void atapi_request_sense(struct ata_queued_cmd *qc)
2513	{
2514	struct ata_port *ap = qc->ap;
2515	struct scsi_cmnd *cmd = qc->scsicmd;
2516
2517	DPRINTK("ATAPI request sense\n");
2518
2519	/* FIXME: is this needed? */
2520	memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2521
2522	#ifdef CONFIG_ATA_SFF
2523	if (ap->ops->sff_tf_read)
2524	ap->ops->sff_tf_read(ap, &qc->tf);
2525	#endif
2526
2527	/* fill these in, for the case where they are -not- overwritten */
2528	cmd->sense_buffer[0] = 0x70;
2529	cmd->sense_buffer[2] = qc->tf.feature >> 4;
2530
2531	ata_qc_reinit(qc);
2532
2533	/* setup sg table and init transfer direction */
2534	sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2535	ata_sg_init(qc, &qc->sgent, 1);
2536	qc->dma_dir = DMA_FROM_DEVICE;
2537
2538	memset(&qc->cdb, 0, qc->dev->cdb_len);
2539	qc->cdb[0] = REQUEST_SENSE;
2540	qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2541
2542	qc->tf.flags \|= ATA_TFLAG_ISADDR \| ATA_TFLAG_DEVICE;
2543	qc->tf.command = ATA_CMD_PACKET;
2544
2545	if (ata_pio_use_silly(ap)) {
2546	qc->tf.protocol = ATAPI_PROT_DMA;
2547	qc->tf.feature \|= ATAPI_PKT_DMA;
2548	} else {
2549	qc->tf.protocol = ATAPI_PROT_PIO;
2550	qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2551	qc->tf.lbah = 0;
2552	}
2553	qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2554
2555	qc->complete_fn = atapi_sense_complete;
2556
2557	ata_qc_issue(qc);
2558
2559	DPRINTK("EXIT\n");
2560	}
2561
2562	static void atapi_qc_complete(struct ata_queued_cmd *qc)
2563	{
2564	struct scsi_cmnd *cmd = qc->scsicmd;
2565	unsigned int err_mask = qc->err_mask;
2566
2567	VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2568
2569	/* handle completion from new EH */
2570	if (unlikely(qc->ap->ops->error_handler &&
2571	(err_mask \|\| qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2572
2573	if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2574	/* FIXME: not quite right; we don't want the
2575	* translation of taskfile registers into a
2576	* sense descriptors, since that's only
2577	* correct for ATA, not ATAPI
2578	*/
2579	ata_gen_passthru_sense(qc);
2580	}
2581
2582	/* SCSI EH automatically locks door if sdev->locked is
2583	* set. Sometimes door lock request continues to
2584	* fail, for example, when no media is present. This
2585	* creates a loop - SCSI EH issues door lock which
2586	* fails and gets invoked again to acquire sense data
2587	* for the failed command.
2588	*
2589	* If door lock fails, always clear sdev->locked to
2590	* avoid this infinite loop.
2591	*
2592	* This may happen before SCSI scan is complete. Make
2593	* sure qc->dev->sdev isn't NULL before dereferencing.
2594	*/
2595	if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
2596	qc->dev->sdev->locked = 0;
2597
2598	qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2599	qc->scsidone(cmd);
2600	ata_qc_free(qc);
2601	return;
2602	}
2603
2604	/* successful completion or old EH failure path */
2605	if (unlikely(err_mask & AC_ERR_DEV)) {
2606	cmd->result = SAM_STAT_CHECK_CONDITION;
2607	atapi_request_sense(qc);
2608	return;
2609	} else if (unlikely(err_mask)) {
2610	/* FIXME: not quite right; we don't want the
2611	* translation of taskfile registers into
2612	* a sense descriptors, since that's only
2613	* correct for ATA, not ATAPI
2614	*/
2615	ata_gen_passthru_sense(qc);
2616	} else {
2617	u8 *scsicmd = cmd->cmnd;
2618
2619	if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2620	unsigned long flags;
2621	u8 *buf;
2622
2623	buf = ata_scsi_rbuf_get(cmd, true, &flags);
2624
2625	/* ATAPI devices typically report zero for their SCSI version,
2626	* and sometimes deviate from the spec WRT response data
2627	* format. If SCSI version is reported as zero like normal,
2628	* then we make the following fixups: 1) Fake MMC-5 version,
2629	* to indicate to the Linux scsi midlayer this is a modern
2630	* device. 2) Ensure response data format / ATAPI information
2631	* are always correct.
2632	*/
2633	if (buf[2] == 0) {
2634	buf[2] = 0x5;
2635	buf[3] = 0x32;
2636	}
2637
2638	ata_scsi_rbuf_put(cmd, true, &flags);
2639	}
2640
2641	cmd->result = SAM_STAT_GOOD;
2642	}
2643
2644	qc->scsidone(cmd);
2645	ata_qc_free(qc);
2646	}
2647	/**
2648	* atapi_xlat - Initialize PACKET taskfile
2649	* @qc: command structure to be initialized
2650	*
2651	* LOCKING:
2652	* spin_lock_irqsave(host lock)
2653	*
2654	* RETURNS:
2655	* Zero on success, non-zero on failure.
2656	*/
2657	static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2658	{
2659	struct scsi_cmnd *scmd = qc->scsicmd;
2660	struct ata_device *dev = qc->dev;
2661	int nodata = (scmd->sc_data_direction == DMA_NONE);
2662	int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2663	unsigned int nbytes;
2664
2665	memset(qc->cdb, 0, dev->cdb_len);
2666	memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2667
2668	qc->complete_fn = atapi_qc_complete;
2669
2670	qc->tf.flags \|= ATA_TFLAG_ISADDR \| ATA_TFLAG_DEVICE;
2671	if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2672	qc->tf.flags \|= ATA_TFLAG_WRITE;
2673	DPRINTK("direction: write\n");
2674	}
2675
2676	qc->tf.command = ATA_CMD_PACKET;
2677	ata_qc_set_pc_nbytes(qc);
2678
2679	/* check whether ATAPI DMA is safe */
2680	if (!nodata && !using_pio && atapi_check_dma(qc))
2681	using_pio = 1;
2682
2683	/* Some controller variants snoop this value for Packet
2684	* transfers to do state machine and FIFO management. Thus we
2685	* want to set it properly, and for DMA where it is
2686	* effectively meaningless.
2687	*/
2688	nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2689
2690	/* Most ATAPI devices which honor transfer chunk size don't
2691	* behave according to the spec when odd chunk size which
2692	* matches the transfer length is specified. If the number of
2693	* bytes to transfer is 2n+1. According to the spec, what
2694	* should happen is to indicate that 2n+1 is going to be
2695	* transferred and transfer 2n+2 bytes where the last byte is
2696	* padding.
2697	*
2698	* In practice, this doesn't happen. ATAPI devices first
2699	* indicate and transfer 2n bytes and then indicate and
2700	* transfer 2 bytes where the last byte is padding.
2701	*
2702	* This inconsistency confuses several controllers which
2703	* perform PIO using DMA such as Intel AHCIs and sil3124/32.
2704	* These controllers use actual number of transferred bytes to
2705	* update DMA poitner and transfer of 4n+2 bytes make those
2706	* controller push DMA pointer by 4n+4 bytes because SATA data
2707	* FISes are aligned to 4 bytes. This causes data corruption
2708	* and buffer overrun.
2709	*
2710	* Always setting nbytes to even number solves this problem
2711	* because then ATAPI devices don't have to split data at 2n
2712	* boundaries.
2713	*/
2714	if (nbytes & 0x1)
2715	nbytes++;
2716
2717	qc->tf.lbam = (nbytes & 0xFF);
2718	qc->tf.lbah = (nbytes >> 8);
2719
2720	if (nodata)
2721	qc->tf.protocol = ATAPI_PROT_NODATA;
2722	else if (using_pio)
2723	qc->tf.protocol = ATAPI_PROT_PIO;
2724	else {
2725	/* DMA data xfer */
2726	qc->tf.protocol = ATAPI_PROT_DMA;
2727	qc->tf.feature \|= ATAPI_PKT_DMA;
2728
2729	if ((dev->flags & ATA_DFLAG_DMADIR) &&
2730	(scmd->sc_data_direction != DMA_TO_DEVICE))
2731	/* some SATA bridges need us to indicate data xfer direction */
2732	qc->tf.feature \|= ATAPI_DMADIR;
2733	}
2734
2735
2736	/* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2737	as ATAPI tape drives don't get this right otherwise */
2738	return 0;
2739	}
2740
2741	static struct ata_device ata_find_dev(struct ata_port ap, int devno)
2742	{
2743	if (!sata_pmp_attached(ap)) {
2744	if (likely(devno < ata_link_max_devices(&ap->link)))
2745	return &ap->link.device[devno];
2746	} else {
2747	if (likely(devno < ap->nr_pmp_links))
2748	return &ap->pmp_link[devno].device[0];
2749	}
2750
2751	return NULL;
2752	}
2753
2754	static struct ata_device __ata_scsi_find_dev(struct ata_port ap,
2755	const struct scsi_device *scsidev)
2756	{
2757	int devno;
2758
2759	/* skip commands not addressed to targets we simulate */
2760	if (!sata_pmp_attached(ap)) {
2761	if (unlikely(scsidev->channel \|\| scsidev->lun))
2762	return NULL;
2763	devno = scsidev->id;
2764	} else {
2765	if (unlikely(scsidev->id \|\| scsidev->lun))
2766	return NULL;
2767	devno = scsidev->channel;
2768	}
2769
2770	return ata_find_dev(ap, devno);
2771	}
2772
2773	/**
2774	* ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2775	* @ap: ATA port to which the device is attached
2776	* @scsidev: SCSI device from which we derive the ATA device
2777	*
2778	* Given various information provided in struct scsi_cmnd,
2779	* map that onto an ATA bus, and using that mapping
2780	* determine which ata_device is associated with the
2781	* SCSI command to be sent.
2782	*
2783	* LOCKING:
2784	* spin_lock_irqsave(host lock)
2785	*
2786	* RETURNS:
2787	* Associated ATA device, or %NULL if not found.
2788	*/
2789	static struct ata_device *
2790	ata_scsi_find_dev(struct ata_port ap, const struct scsi_device scsidev)
2791	{
2792	struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2793
2794	if (unlikely(!dev \|\| !ata_dev_enabled(dev)))
2795	return NULL;
2796
2797	return dev;
2798	}
2799
2800	/*
2801	* ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2802	* @byte1: Byte 1 from pass-thru CDB.
2803	*
2804	* RETURNS:
2805	* ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2806	*/
2807	static u8
2808	ata_scsi_map_proto(u8 byte1)
2809	{
2810	switch((byte1 & 0x1e) >> 1) {
2811	case 3: /* Non-data */
2812	return ATA_PROT_NODATA;
2813
2814	case 6: /* DMA */
2815	case 10: /* UDMA Data-in */
2816	case 11: /* UDMA Data-Out */
2817	return ATA_PROT_DMA;
2818
2819	case 4: /* PIO Data-in */
2820	case 5: /* PIO Data-out */
2821	return ATA_PROT_PIO;
2822
2823	case 0: /* Hard Reset */
2824	case 1: /* SRST */
2825	case 8: /* Device Diagnostic */
2826	case 9: /* Device Reset */
2827	case 7: /* DMA Queued */
2828	case 12: /* FPDMA */
2829	case 15: /* Return Response Info */
2830	default: /* Reserved */
2831	break;
2832	}
2833
2834	return ATA_PROT_UNKNOWN;
2835	}
2836
2837	/**
2838	* ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2839	* @qc: command structure to be initialized
2840	*
2841	* Handles either 12 or 16-byte versions of the CDB.
2842	*
2843	* RETURNS:
2844	* Zero on success, non-zero on failure.
2845	*/
2846	static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2847	{
2848	struct ata_taskfile *tf = &(qc->tf);
2849	struct scsi_cmnd *scmd = qc->scsicmd;
2850	struct ata_device *dev = qc->dev;
2851	const u8 *cdb = scmd->cmnd;
2852
2853	if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2854	goto invalid_fld;
2855
2856	/*
2857	* 12 and 16 byte CDBs use different offsets to
2858	* provide the various register values.
2859	*/
2860	if (cdb[0] == ATA_16) {
2861	/*
2862	* 16-byte CDB - may contain extended commands.
2863	*
2864	* If that is the case, copy the upper byte register values.
2865	*/
2866	if (cdb[1] & 0x01) {
2867	tf->hob_feature = cdb[3];
2868	tf->hob_nsect = cdb[5];
2869	tf->hob_lbal = cdb[7];
2870	tf->hob_lbam = cdb[9];
2871	tf->hob_lbah = cdb[11];
2872	tf->flags \|= ATA_TFLAG_LBA48;
2873	} else
2874	tf->flags &= ~ATA_TFLAG_LBA48;
2875
2876	/*
2877	* Always copy low byte, device and command registers.
2878	*/
2879	tf->feature = cdb[4];
2880	tf->nsect = cdb[6];
2881	tf->lbal = cdb[8];
2882	tf->lbam = cdb[10];
2883	tf->lbah = cdb[12];
2884	tf->device = cdb[13];
2885	tf->command = cdb[14];
2886	} else {
2887	/*
2888	* 12-byte CDB - incapable of extended commands.
2889	*/
2890	tf->flags &= ~ATA_TFLAG_LBA48;
2891
2892	tf->feature = cdb[3];
2893	tf->nsect = cdb[4];
2894	tf->lbal = cdb[5];
2895	tf->lbam = cdb[6];
2896	tf->lbah = cdb[7];
2897	tf->device = cdb[8];
2898	tf->command = cdb[9];
2899	}
2900
2901	/* enforce correct master/slave bit */
2902	tf->device = dev->devno ?
2903	tf->device \| ATA_DEV1 : tf->device & ~ATA_DEV1;
2904
2905	switch (tf->command) {
2906	/* READ/WRITE LONG use a non-standard sect_size */
2907	case ATA_CMD_READ_LONG:
2908	case ATA_CMD_READ_LONG_ONCE:
2909	case ATA_CMD_WRITE_LONG:
2910	case ATA_CMD_WRITE_LONG_ONCE:
2911	if (tf->protocol != ATA_PROT_PIO \|\| tf->nsect != 1)
2912	goto invalid_fld;
2913	qc->sect_size = scsi_bufflen(scmd);
2914	break;
2915
2916	/* commands using reported Logical Block size (e.g. 512 or 4K) */
2917	case ATA_CMD_CFA_WRITE_NE:
2918	case ATA_CMD_CFA_TRANS_SECT:
2919	case ATA_CMD_CFA_WRITE_MULT_NE:
2920	/* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
2921	case ATA_CMD_READ:
2922	case ATA_CMD_READ_EXT:
2923	case ATA_CMD_READ_QUEUED:
2924	/* XXX: case ATA_CMD_READ_QUEUED_EXT: */
2925	case ATA_CMD_FPDMA_READ:
2926	case ATA_CMD_READ_MULTI:
2927	case ATA_CMD_READ_MULTI_EXT:
2928	case ATA_CMD_PIO_READ:
2929	case ATA_CMD_PIO_READ_EXT:
2930	case ATA_CMD_READ_STREAM_DMA_EXT:
2931	case ATA_CMD_READ_STREAM_EXT:
2932	case ATA_CMD_VERIFY:
2933	case ATA_CMD_VERIFY_EXT:
2934	case ATA_CMD_WRITE:
2935	case ATA_CMD_WRITE_EXT:
2936	case ATA_CMD_WRITE_FUA_EXT:
2937	case ATA_CMD_WRITE_QUEUED:
2938	case ATA_CMD_WRITE_QUEUED_FUA_EXT:
2939	case ATA_CMD_FPDMA_WRITE:
2940	case ATA_CMD_WRITE_MULTI:
2941	case ATA_CMD_WRITE_MULTI_EXT:
2942	case ATA_CMD_WRITE_MULTI_FUA_EXT:
2943	case ATA_CMD_PIO_WRITE:
2944	case ATA_CMD_PIO_WRITE_EXT:
2945	case ATA_CMD_WRITE_STREAM_DMA_EXT:
2946	case ATA_CMD_WRITE_STREAM_EXT:
2947	qc->sect_size = scmd->device->sector_size;
2948	break;
2949
2950	/* Everything else uses 512 byte "sectors" */
2951	default:
2952	qc->sect_size = ATA_SECT_SIZE;
2953	}
2954
2955	/*
2956	* Set flags so that all registers will be written, pass on
2957	* write indication (used for PIO/DMA setup), result TF is
2958	* copied back and we don't whine too much about its failure.
2959	*/
2960	tf->flags \|= ATA_TFLAG_ISADDR \| ATA_TFLAG_DEVICE;
2961	if (scmd->sc_data_direction == DMA_TO_DEVICE)
2962	tf->flags \|= ATA_TFLAG_WRITE;
2963
2964	qc->flags \|= ATA_QCFLAG_RESULT_TF \| ATA_QCFLAG_QUIET;
2965
2966	/*
2967	* Set transfer length.
2968	*
2969	* TODO: find out if we need to do more here to
2970	* cover scatter/gather case.
2971	*/
2972	ata_qc_set_pc_nbytes(qc);
2973
2974	/* We may not issue DMA commands if no DMA mode is set */
2975	if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2976	goto invalid_fld;
2977
2978	/* sanity check for pio multi commands */
2979	if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
2980	goto invalid_fld;
2981
2982	if (is_multi_taskfile(tf)) {
2983	unsigned int multi_count = 1 << (cdb[1] >> 5);
2984
2985	/* compare the passed through multi_count
2986	* with the cached multi_count of libata
2987	*/
2988	if (multi_count != dev->multi_count)
2989	ata_dev_warn(dev, "invalid multi_count %u ignored\n",
2990	multi_count);
2991	}
2992
2993	/*
2994	* Filter SET_FEATURES - XFER MODE command -- otherwise,
2995	* SET_FEATURES - XFER MODE must be preceded/succeeded
2996	* by an update to hardware-specific registers for each
2997	* controller (i.e. the reason for ->set_piomode(),
2998	* ->set_dmamode(), and ->post_set_mode() hooks).
2999	*/
3000	if (tf->command == ATA_CMD_SET_FEATURES &&
3001	tf->feature == SETFEATURES_XFER)
3002	goto invalid_fld;
3003
3004	/*
3005	* Filter TPM commands by default. These provide an
3006	* essentially uncontrolled encrypted "back door" between
3007	* applications and the disk. Set libata.allow_tpm=1 if you
3008	* have a real reason for wanting to use them. This ensures
3009	* that installed software cannot easily mess stuff up without
3010	* user intent. DVR type users will probably ship with this enabled
3011	* for movie content management.
3012	*
3013	* Note that for ATA8 we can issue a DCS change and DCS freeze lock
3014	* for this and should do in future but that it is not sufficient as
3015	* DCS is an optional feature set. Thus we also do the software filter
3016	* so that we comply with the TC consortium stated goal that the user
3017	* can turn off TC features of their system.
3018	*/
3019	if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
3020	goto invalid_fld;
3021
3022	return 0;
3023
3024	invalid_fld:
3025	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3026	/* "Invalid field in cdb" */
3027	return 1;
3028	}
3029
3030	static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3031	{
3032	struct ata_taskfile *tf = &qc->tf;
3033	struct scsi_cmnd *scmd = qc->scsicmd;
3034	struct ata_device *dev = qc->dev;
3035	const u8 *cdb = scmd->cmnd;
3036	u64 block;
3037	u32 n_block;
3038	u32 size;
3039	void *buf;
3040
3041	/* we may not issue DMA commands if no DMA mode is set */
3042	if (unlikely(!dev->dma_mode))
3043	goto invalid_fld;
3044
3045	if (unlikely(scmd->cmd_len < 16))
3046	goto invalid_fld;
3047	scsi_16_lba_len(cdb, &block, &n_block);
3048
3049	/* for now we only support WRITE SAME with the unmap bit set */
3050	if (unlikely(!(cdb[1] & 0x8)))
3051	goto invalid_fld;
3052
3053	/*
3054	* WRITE SAME always has a sector sized buffer as payload, this
3055	* should never be a multiple entry S/G list.
3056	*/
3057	if (!scsi_sg_count(scmd))
3058	goto invalid_fld;
3059
3060	buf = page_address(sg_page(scsi_sglist(scmd)));
3061	size = ata_set_lba_range_entries(buf, 512, block, n_block);
3062
3063	tf->protocol = ATA_PROT_DMA;
3064	tf->hob_feature = 0;
3065	tf->feature = ATA_DSM_TRIM;
3066	tf->hob_nsect = (size / 512) >> 8;
3067	tf->nsect = size / 512;
3068	tf->command = ATA_CMD_DSM;
3069	tf->flags \|= ATA_TFLAG_ISADDR \| ATA_TFLAG_DEVICE \| ATA_TFLAG_LBA48 \|
3070	ATA_TFLAG_WRITE;
3071
3072	ata_qc_set_pc_nbytes(qc);
3073
3074	return 0;
3075
3076	invalid_fld:
3077	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3078	/* "Invalid field in cdb" */
3079	return 1;
3080	}
3081
3082	/**
3083	* ata_get_xlat_func - check if SCSI to ATA translation is possible
3084	* @dev: ATA device
3085	* @cmd: SCSI command opcode to consider
3086	*
3087	* Look up the SCSI command given, and determine whether the
3088	* SCSI command is to be translated or simulated.
3089	*
3090	* RETURNS:
3091	* Pointer to translation function if possible, %NULL if not.
3092	*/
3093
3094	static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
3095	{
3096	switch (cmd) {
3097	case READ_6:
3098	case READ_10:
3099	case READ_16:
3100
3101	case WRITE_6:
3102	case WRITE_10:
3103	case WRITE_16:
3104	return ata_scsi_rw_xlat;
3105
3106	case WRITE_SAME_16:
3107	return ata_scsi_write_same_xlat;
3108
3109	case SYNCHRONIZE_CACHE:
3110	if (ata_try_flush_cache(dev))
3111	return ata_scsi_flush_xlat;
3112	break;
3113
3114	case VERIFY:
3115	case VERIFY_16:
3116	return ata_scsi_verify_xlat;
3117
3118	case ATA_12:
3119	case ATA_16:
3120	return ata_scsi_pass_thru;
3121
3122	case START_STOP:
3123	return ata_scsi_start_stop_xlat;
3124	}
3125
3126	return NULL;
3127	}
3128
3129	/**
3130	* ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3131	* @ap: ATA port to which the command was being sent
3132	* @cmd: SCSI command to dump
3133	*
3134	* Prints the contents of a SCSI command via printk().
3135	*/
3136
3137	static inline void ata_scsi_dump_cdb(struct ata_port *ap,
3138	struct scsi_cmnd *cmd)
3139	{
3140	#ifdef ATA_DEBUG
3141	struct scsi_device *scsidev = cmd->device;
3142	u8 *scsicmd = cmd->cmnd;
3143
3144	DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
3145	ap->print_id,
3146	scsidev->channel, scsidev->id, scsidev->lun,
3147	scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
3148	scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
3149	scsicmd[8]);
3150	#endif
3151	}
3152
3153	static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
3154	struct ata_device *dev)
3155	{
3156	u8 scsi_op = scmd->cmnd[0];
3157	ata_xlat_func_t xlat_func;
3158	int rc = 0;
3159
3160	if (dev->class == ATA_DEV_ATA) {
3161	if (unlikely(!scmd->cmd_len \|\| scmd->cmd_len > dev->cdb_len))
3162	goto bad_cdb_len;
3163
3164	xlat_func = ata_get_xlat_func(dev, scsi_op);
3165	} else {
3166	if (unlikely(!scmd->cmd_len))
3167	goto bad_cdb_len;
3168
3169	xlat_func = NULL;
3170	if (likely((scsi_op != ATA_16) \|\| !atapi_passthru16)) {
3171	/* relay SCSI command to ATAPI device */
3172	int len = COMMAND_SIZE(scsi_op);
3173	if (unlikely(len > scmd->cmd_len \|\| len > dev->cdb_len))
3174	goto bad_cdb_len;
3175
3176	xlat_func = atapi_xlat;
3177	} else {
3178	/* ATA_16 passthru, treat as an ATA command */
3179	if (unlikely(scmd->cmd_len > 16))
3180	goto bad_cdb_len;
3181
3182	xlat_func = ata_get_xlat_func(dev, scsi_op);
3183	}
3184	}
3185
3186	if (xlat_func)
3187	rc = ata_scsi_translate(dev, scmd, xlat_func);
3188	else
3189	ata_scsi_simulate(dev, scmd);
3190
3191	return rc;
3192
3193	bad_cdb_len:
3194	DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3195	scmd->cmd_len, scsi_op, dev->cdb_len);
3196	scmd->result = DID_ERROR << 16;
3197	scmd->scsi_done(scmd);
3198	return 0;
3199	}
3200
3201	/**
3202	* ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3203	* @shost: SCSI host of command to be sent
3204	* @cmd: SCSI command to be sent
3205	*
3206	* In some cases, this function translates SCSI commands into
3207	* ATA taskfiles, and queues the taskfiles to be sent to
3208	* hardware. In other cases, this function simulates a
3209	* SCSI device by evaluating and responding to certain
3210	* SCSI commands. This creates the overall effect of
3211	* ATA and ATAPI devices appearing as SCSI devices.
3212	*
3213	* LOCKING:
3214	* ATA host lock
3215	*
3216	* RETURNS:
3217	* Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3218	* 0 otherwise.
3219	*/
3220	int ata_scsi_queuecmd(struct Scsi_Host shost, struct scsi_cmnd cmd)
3221	{
3222	struct ata_port *ap;
3223	struct ata_device *dev;
3224	struct scsi_device *scsidev = cmd->device;
3225	int rc = 0;
3226	unsigned long irq_flags;
3227
3228	ap = ata_shost_to_port(shost);
3229
3230	spin_lock_irqsave(ap->lock, irq_flags);
3231
3232	ata_scsi_dump_cdb(ap, cmd);
3233
3234	dev = ata_scsi_find_dev(ap, scsidev);
3235	if (likely(dev))
3236	rc = __ata_scsi_queuecmd(cmd, dev);
3237	else {
3238	cmd->result = (DID_BAD_TARGET << 16);
3239	cmd->scsi_done(cmd);
3240	}
3241
3242	spin_unlock_irqrestore(ap->lock, irq_flags);
3243
3244	return rc;
3245	}
3246
3247	/**
3248	* ata_scsi_simulate - simulate SCSI command on ATA device
3249	* @dev: the target device
3250	* @cmd: SCSI command being sent to device.
3251	*
3252	* Interprets and directly executes a select list of SCSI commands
3253	* that can be handled internally.
3254	*
3255	* LOCKING:
3256	* spin_lock_irqsave(host lock)
3257	*/
3258
3259	void ata_scsi_simulate(struct ata_device dev, struct scsi_cmnd cmd)
3260	{
3261	struct ata_scsi_args args;
3262	const u8 *scsicmd = cmd->cmnd;
3263	u8 tmp8;
3264
3265	args.dev = dev;
3266	args.id = dev->id;
3267	args.cmd = cmd;
3268	args.done = cmd->scsi_done;
3269
3270	switch(scsicmd[0]) {
3271	/* TODO: worth improving? */
3272	case FORMAT_UNIT:
3273	ata_scsi_invalid_field(cmd);
3274	break;
3275
3276	case INQUIRY:
3277	if (scsicmd[1] & 2) /* is CmdDt set? */
3278	ata_scsi_invalid_field(cmd);
3279	else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3280	ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3281	else switch (scsicmd[2]) {
3282	case 0x00:
3283	ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3284	break;
3285	case 0x80:
3286	ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3287	break;
3288	case 0x83:
3289	ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3290	break;
3291	case 0x89:
3292	ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3293	break;
3294	case 0xb0:
3295	ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
3296	break;
3297	case 0xb1:
3298	ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3299	break;
3300	case 0xb2:
3301	ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
3302	break;
3303	default:
3304	ata_scsi_invalid_field(cmd);
3305	break;
3306	}
3307	break;
3308
3309	case MODE_SENSE:
3310	case MODE_SENSE_10:
3311	ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3312	break;
3313
3314	case MODE_SELECT: /* unconditionally return */
3315	case MODE_SELECT_10: /* bad-field-in-cdb */
3316	ata_scsi_invalid_field(cmd);
3317	break;
3318
3319	case READ_CAPACITY:
3320	ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3321	break;
3322
3323	case SERVICE_ACTION_IN:
3324	if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3325	ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3326	else
3327	ata_scsi_invalid_field(cmd);
3328	break;
3329
3330	case REPORT_LUNS:
3331	ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3332	break;
3333
3334	case REQUEST_SENSE:
3335	ata_scsi_set_sense(cmd, 0, 0, 0);
3336	cmd->result = (DRIVER_SENSE << 24);
3337	cmd->scsi_done(cmd);
3338	break;
3339
3340	/* if we reach this, then writeback caching is disabled,
3341	* turning this into a no-op.
3342	*/
3343	case SYNCHRONIZE_CACHE:
3344	/* fall through */
3345
3346	/* no-op's, complete with success */
3347	case REZERO_UNIT:
3348	case SEEK_6:
3349	case SEEK_10:
3350	case TEST_UNIT_READY:
3351	ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3352	break;
3353
3354	case SEND_DIAGNOSTIC:
3355	tmp8 = scsicmd[1] & ~(1 << 3);
3356	if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3357	ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3358	else
3359	ata_scsi_invalid_field(cmd);
3360	break;
3361
3362	/* all other commands */
3363	default:
3364	ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3365	/* "Invalid command operation code" */
3366	cmd->scsi_done(cmd);
3367	break;
3368	}
3369	}
3370
3371	int ata_scsi_add_hosts(struct ata_host host, struct scsi_host_template sht)
3372	{
3373	int i, rc;
3374
3375	for (i = 0; i < host->n_ports; i++) {
3376	struct ata_port *ap = host->ports[i];
3377	struct Scsi_Host *shost;
3378
3379	rc = -ENOMEM;
3380	shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3381	if (!shost)
3382	goto err_alloc;
3383
3384	shost->eh_noresume = 1;
3385	(struct ata_port *)&shost->hostdata[0] = ap;
3386	ap->scsi_host = shost;
3387
3388	shost->transportt = ata_scsi_transport_template;
3389	shost->unique_id = ap->print_id;
3390	shost->max_id = 16;
3391	shost->max_lun = 1;
3392	shost->max_channel = 1;
3393	shost->max_cmd_len = 16;
3394
3395	/* Schedule policy is determined by ->qc_defer()
3396	* callback and it needs to see every deferred qc.
3397	* Set host_blocked to 1 to prevent SCSI midlayer from
3398	* automatically deferring requests.
3399	*/
3400	shost->max_host_blocked = 1;
3401
3402	rc = scsi_add_host_with_dma(ap->scsi_host,
3403	&ap->tdev, ap->host->dev);
3404	if (rc)
3405	goto err_add;
3406	}
3407
3408	return 0;
3409
3410	err_add:
3411	scsi_host_put(host->ports[i]->scsi_host);
3412	err_alloc:
3413	while (--i >= 0) {
3414	struct Scsi_Host *shost = host->ports[i]->scsi_host;
3415
3416	scsi_remove_host(shost);
3417	scsi_host_put(shost);
3418	}
3419	return rc;
3420	}
3421
3422	void ata_scsi_scan_host(struct ata_port *ap, int sync)
3423	{
3424	int tries = 5;
3425	struct ata_device *last_failed_dev = NULL;
3426	struct ata_link *link;
3427	struct ata_device *dev;
3428
3429	repeat:
3430	ata_for_each_link(link, ap, EDGE) {
3431	ata_for_each_dev(dev, link, ENABLED) {
3432	struct scsi_device *sdev;
3433	int channel = 0, id = 0;
3434
3435	if (dev->sdev)
3436	continue;
3437
3438	if (ata_is_host_link(link))
3439	id = dev->devno;
3440	else
3441	channel = link->pmp;
3442
3443	sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3444	NULL);
3445	if (!IS_ERR(sdev)) {
3446	dev->sdev = sdev;
3447	scsi_device_put(sdev);
3448	ata_acpi_bind(dev);
3449	} else {
3450	dev->sdev = NULL;
3451	}
3452	}
3453	}
3454
3455	/* If we scanned while EH was in progress or allocation
3456	* failure occurred, scan would have failed silently. Check
3457	* whether all devices are attached.
3458	*/
3459	ata_for_each_link(link, ap, EDGE) {
3460	ata_for_each_dev(dev, link, ENABLED) {
3461	if (!dev->sdev)
3462	goto exit_loop;
3463	}
3464	}
3465	exit_loop:
3466	if (!link)
3467	return;
3468
3469	/* we're missing some SCSI devices */
3470	if (sync) {
3471	/* If caller requested synchrnous scan && we've made
3472	* any progress, sleep briefly and repeat.
3473	*/
3474	if (dev != last_failed_dev) {
3475	msleep(100);
3476	last_failed_dev = dev;
3477	goto repeat;
3478	}
3479
3480	/* We might be failing to detect boot device, give it
3481	* a few more chances.
3482	*/
3483	if (--tries) {
3484	msleep(100);
3485	goto repeat;
3486	}
3487
3488	ata_port_err(ap,
3489	"WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
3490	}
3491
3492	queue_delayed_work(system_long_wq, &ap->hotplug_task,
3493	round_jiffies_relative(HZ));
3494	}
3495
3496	/**
3497	* ata_scsi_offline_dev - offline attached SCSI device
3498	* @dev: ATA device to offline attached SCSI device for
3499	*
3500	* This function is called from ata_eh_hotplug() and responsible
3501	* for taking the SCSI device attached to @dev offline. This
3502	* function is called with host lock which protects dev->sdev
3503	* against clearing.
3504	*
3505	* LOCKING:
3506	* spin_lock_irqsave(host lock)
3507	*
3508	* RETURNS:
3509	* 1 if attached SCSI device exists, 0 otherwise.
3510	*/
3511	int ata_scsi_offline_dev(struct ata_device *dev)
3512	{
3513	if (dev->sdev) {
3514	scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3515	return 1;
3516	}
3517	return 0;
3518	}
3519
3520	/**
3521	* ata_scsi_remove_dev - remove attached SCSI device
3522	* @dev: ATA device to remove attached SCSI device for
3523	*
3524	* This function is called from ata_eh_scsi_hotplug() and
3525	* responsible for removing the SCSI device attached to @dev.
3526	*
3527	* LOCKING:
3528	* Kernel thread context (may sleep).
3529	*/
3530	static void ata_scsi_remove_dev(struct ata_device *dev)
3531	{
3532	struct ata_port *ap = dev->link->ap;
3533	struct scsi_device *sdev;
3534	unsigned long flags;
3535
3536	/* Alas, we need to grab scan_mutex to ensure SCSI device
3537	* state doesn't change underneath us and thus
3538	* scsi_device_get() always succeeds. The mutex locking can
3539	* be removed if there is __scsi_device_get() interface which
3540	* increments reference counts regardless of device state.
3541	*/
3542	mutex_lock(&ap->scsi_host->scan_mutex);
3543	spin_lock_irqsave(ap->lock, flags);
3544
3545	ata_acpi_unbind(dev);
3546
3547	/* clearing dev->sdev is protected by host lock */
3548	sdev = dev->sdev;
3549	dev->sdev = NULL;
3550
3551	if (sdev) {
3552	/* If user initiated unplug races with us, sdev can go
3553	* away underneath us after the host lock and
3554	* scan_mutex are released. Hold onto it.
3555	*/
3556	if (scsi_device_get(sdev) == 0) {
3557	/* The following ensures the attached sdev is
3558	* offline on return from ata_scsi_offline_dev()
3559	* regardless it wins or loses the race
3560	* against this function.
3561	*/
3562	scsi_device_set_state(sdev, SDEV_OFFLINE);
3563	} else {
3564	WARN_ON(1);
3565	sdev = NULL;
3566	}
3567	}
3568
3569	spin_unlock_irqrestore(ap->lock, flags);
3570	mutex_unlock(&ap->scsi_host->scan_mutex);
3571
3572	if (sdev) {
3573	ata_dev_info(dev, "detaching (SCSI %s)\n",
3574	dev_name(&sdev->sdev_gendev));
3575
3576	scsi_remove_device(sdev);
3577	scsi_device_put(sdev);
3578	}
3579	}
3580
3581	static void ata_scsi_handle_link_detach(struct ata_link *link)
3582	{
3583	struct ata_port *ap = link->ap;
3584	struct ata_device *dev;
3585
3586	ata_for_each_dev(dev, link, ALL) {
3587	unsigned long flags;
3588
3589	if (!(dev->flags & ATA_DFLAG_DETACHED))
3590	continue;
3591
3592	spin_lock_irqsave(ap->lock, flags);
3593	dev->flags &= ~ATA_DFLAG_DETACHED;
3594	spin_unlock_irqrestore(ap->lock, flags);
3595
3596	ata_scsi_remove_dev(dev);
3597	}
3598	}
3599
3600	/**
3601	* ata_scsi_media_change_notify - send media change event
3602	* @dev: Pointer to the disk device with media change event
3603	*
3604	* Tell the block layer to send a media change notification
3605	* event.
3606	*
3607	* LOCKING:
3608	* spin_lock_irqsave(host lock)
3609	*/
3610	void ata_scsi_media_change_notify(struct ata_device *dev)
3611	{
3612	if (dev->sdev)
3613	sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3614	GFP_ATOMIC);
3615	}
3616
3617	/**
3618	* ata_scsi_hotplug - SCSI part of hotplug
3619	* @work: Pointer to ATA port to perform SCSI hotplug on
3620	*
3621	* Perform SCSI part of hotplug. It's executed from a separate
3622	* workqueue after EH completes. This is necessary because SCSI
3623	* hot plugging requires working EH and hot unplugging is
3624	* synchronized with hot plugging with a mutex.
3625	*
3626	* LOCKING:
3627	* Kernel thread context (may sleep).
3628	*/
3629	void ata_scsi_hotplug(struct work_struct *work)
3630	{
3631	struct ata_port *ap =
3632	container_of(work, struct ata_port, hotplug_task.work);
3633	int i;
3634
3635	if (ap->pflags & ATA_PFLAG_UNLOADING) {
3636	DPRINTK("ENTER/EXIT - unloading\n");
3637	return;
3638	}
3639
3640	DPRINTK("ENTER\n");
3641	mutex_lock(&ap->scsi_scan_mutex);
3642
3643	/* Unplug detached devices. We cannot use link iterator here
3644	* because PMP links have to be scanned even if PMP is
3645	* currently not attached. Iterate manually.
3646	*/
3647	ata_scsi_handle_link_detach(&ap->link);
3648	if (ap->pmp_link)
3649	for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3650	ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3651
3652	/* scan for new ones */
3653	ata_scsi_scan_host(ap, 0);
3654
3655	mutex_unlock(&ap->scsi_scan_mutex);
3656	DPRINTK("EXIT\n");
3657	}
3658
3659	/**
3660	* ata_scsi_user_scan - indication for user-initiated bus scan
3661	* @shost: SCSI host to scan
3662	* @channel: Channel to scan
3663	* @id: ID to scan
3664	* @lun: LUN to scan
3665	*
3666	* This function is called when user explicitly requests bus
3667	* scan. Set probe pending flag and invoke EH.
3668	*
3669	* LOCKING:
3670	* SCSI layer (we don't care)
3671	*
3672	* RETURNS:
3673	* Zero.
3674	*/
3675	int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3676	unsigned int id, unsigned int lun)
3677	{
3678	struct ata_port *ap = ata_shost_to_port(shost);
3679	unsigned long flags;
3680	int devno, rc = 0;
3681
3682	if (!ap->ops->error_handler)
3683	return -EOPNOTSUPP;
3684
3685	if (lun != SCAN_WILD_CARD && lun)
3686	return -EINVAL;
3687
3688	if (!sata_pmp_attached(ap)) {
3689	if (channel != SCAN_WILD_CARD && channel)
3690	return -EINVAL;
3691	devno = id;
3692	} else {
3693	if (id != SCAN_WILD_CARD && id)
3694	return -EINVAL;
3695	devno = channel;
3696	}
3697
3698	spin_lock_irqsave(ap->lock, flags);
3699
3700	if (devno == SCAN_WILD_CARD) {
3701	struct ata_link *link;
3702
3703	ata_for_each_link(link, ap, EDGE) {
3704	struct ata_eh_info *ehi = &link->eh_info;
3705	ehi->probe_mask \|= ATA_ALL_DEVICES;
3706	ehi->action \|= ATA_EH_RESET;
3707	}
3708	} else {
3709	struct ata_device *dev = ata_find_dev(ap, devno);
3710
3711	if (dev) {
3712	struct ata_eh_info *ehi = &dev->link->eh_info;
3713	ehi->probe_mask \|= 1 << dev->devno;
3714	ehi->action \|= ATA_EH_RESET;
3715	} else
3716	rc = -EINVAL;
3717	}
3718
3719	if (rc == 0) {
3720	ata_port_schedule_eh(ap);
3721	spin_unlock_irqrestore(ap->lock, flags);
3722	ata_port_wait_eh(ap);
3723	} else
3724	spin_unlock_irqrestore(ap->lock, flags);
3725
3726	return rc;
3727	}
3728
3729	/**
3730	* ata_scsi_dev_rescan - initiate scsi_rescan_device()
3731	* @work: Pointer to ATA port to perform scsi_rescan_device()
3732	*
3733	* After ATA pass thru (SAT) commands are executed successfully,
3734	* libata need to propagate the changes to SCSI layer.
3735	*
3736	* LOCKING:
3737	* Kernel thread context (may sleep).
3738	*/
3739	void ata_scsi_dev_rescan(struct work_struct *work)
3740	{
3741	struct ata_port *ap =
3742	container_of(work, struct ata_port, scsi_rescan_task);
3743	struct ata_link *link;
3744	struct ata_device *dev;
3745	unsigned long flags;
3746
3747	mutex_lock(&ap->scsi_scan_mutex);
3748	spin_lock_irqsave(ap->lock, flags);
3749
3750	ata_for_each_link(link, ap, EDGE) {
3751	ata_for_each_dev(dev, link, ENABLED) {
3752	struct scsi_device *sdev = dev->sdev;
3753
3754	if (!sdev)
3755	continue;
3756	if (scsi_device_get(sdev))
3757	continue;
3758
3759	spin_unlock_irqrestore(ap->lock, flags);
3760	scsi_rescan_device(&(sdev->sdev_gendev));
3761	scsi_device_put(sdev);
3762	spin_lock_irqsave(ap->lock, flags);
3763	}
3764	}
3765
3766	spin_unlock_irqrestore(ap->lock, flags);
3767	mutex_unlock(&ap->scsi_scan_mutex);
3768	}
3769
3770	/**
3771	* ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3772	* @host: ATA host container for all SAS ports
3773	* @port_info: Information from low-level host driver
3774	* @shost: SCSI host that the scsi device is attached to
3775	*
3776	* LOCKING:
3777	* PCI/etc. bus probe sem.
3778	*
3779	* RETURNS:
3780	* ata_port pointer on success / NULL on failure.
3781	*/
3782
3783	struct ata_port ata_sas_port_alloc(struct ata_host host,
3784	struct ata_port_info *port_info,
3785	struct Scsi_Host *shost)
3786	{
3787	struct ata_port *ap;
3788
3789	ap = ata_port_alloc(host);
3790	if (!ap)
3791	return NULL;
3792
3793	ap->port_no = 0;
3794	ap->lock = &host->lock;
3795	ap->pio_mask = port_info->pio_mask;
3796	ap->mwdma_mask = port_info->mwdma_mask;
3797	ap->udma_mask = port_info->udma_mask;
3798	ap->flags \|= port_info->flags;
3799	ap->ops = port_info->port_ops;
3800	ap->cbl = ATA_CBL_SATA;
3801
3802	return ap;
3803	}
3804	EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3805
3806	/**
3807	* ata_sas_port_start - Set port up for dma.
3808	* @ap: Port to initialize
3809	*
3810	* Called just after data structures for each port are
3811	* initialized.
3812	*
3813	* May be used as the port_start() entry in ata_port_operations.
3814	*
3815	* LOCKING:
3816	* Inherited from caller.
3817	*/
3818	int ata_sas_port_start(struct ata_port *ap)
3819	{
3820	/*
3821	* the port is marked as frozen at allocation time, but if we don't
3822	* have new eh, we won't thaw it
3823	*/
3824	if (!ap->ops->error_handler)
3825	ap->pflags &= ~ATA_PFLAG_FROZEN;
3826	return 0;
3827	}
3828	EXPORT_SYMBOL_GPL(ata_sas_port_start);
3829
3830	/**
3831	* ata_port_stop - Undo ata_sas_port_start()
3832	* @ap: Port to shut down
3833	*
3834	* May be used as the port_stop() entry in ata_port_operations.
3835	*
3836	* LOCKING:
3837	* Inherited from caller.
3838	*/
3839
3840	void ata_sas_port_stop(struct ata_port *ap)
3841	{
3842	}
3843	EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3844
3845	/**
3846	* ata_sas_async_probe - simply schedule probing and return
3847	* @ap: Port to probe
3848	*
3849	* For batch scheduling of probe for sas attached ata devices, assumes
3850	* the port has already been through ata_sas_port_init()
3851	*/
3852	void ata_sas_async_probe(struct ata_port *ap)
3853	{
3854	__ata_port_probe(ap);
3855	}
3856	EXPORT_SYMBOL_GPL(ata_sas_async_probe);
3857
3858	int ata_sas_sync_probe(struct ata_port *ap)
3859	{
3860	return ata_port_probe(ap);
3861	}
3862	EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
3863
3864
3865	/**
3866	* ata_sas_port_init - Initialize a SATA device
3867	* @ap: SATA port to initialize
3868	*
3869	* LOCKING:
3870	* PCI/etc. bus probe sem.
3871	*
3872	* RETURNS:
3873	* Zero on success, non-zero on error.
3874	*/
3875
3876	int ata_sas_port_init(struct ata_port *ap)
3877	{
3878	int rc = ap->ops->port_start(ap);
3879
3880	if (rc)
3881	return rc;
3882	ap->print_id = atomic_inc_return(&ata_print_id);
3883	return 0;
3884	}
3885	EXPORT_SYMBOL_GPL(ata_sas_port_init);
3886
3887	/**
3888	* ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3889	* @ap: SATA port to destroy
3890	*
3891	*/
3892
3893	void ata_sas_port_destroy(struct ata_port *ap)
3894	{
3895	if (ap->ops->port_stop)
3896	ap->ops->port_stop(ap);
3897	kfree(ap);
3898	}
3899	EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3900
3901	/**
3902	* ata_sas_slave_configure - Default slave_config routine for libata devices
3903	* @sdev: SCSI device to configure
3904	* @ap: ATA port to which SCSI device is attached
3905	*
3906	* RETURNS:
3907	* Zero.
3908	*/
3909
3910	int ata_sas_slave_configure(struct scsi_device sdev, struct ata_port ap)
3911	{
3912	ata_scsi_sdev_config(sdev);
3913	ata_scsi_dev_config(sdev, ap->link.device);
3914	return 0;
3915	}
3916	EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3917
3918	/**
3919	* ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3920	* @cmd: SCSI command to be sent
3921	* @ap: ATA port to which the command is being sent
3922	*
3923	* RETURNS:
3924	* Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3925	* 0 otherwise.
3926	*/
3927
3928	int ata_sas_queuecmd(struct scsi_cmnd cmd, struct ata_port ap)
3929	{
3930	int rc = 0;
3931
3932	ata_scsi_dump_cdb(ap, cmd);
3933
3934	if (likely(ata_dev_enabled(ap->link.device)))
3935	rc = __ata_scsi_queuecmd(cmd, ap->link.device);
3936	else {
3937	cmd->result = (DID_BAD_TARGET << 16);
3938	cmd->scsi_done(cmd);
3939	}
3940	return rc;
3941	}
3942	EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
3943

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