[mirror_ubuntu-artful-kernel.git] / drivers / ide / ide-pm.c

#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/ide.h>

int generic_ide_suspend(struct device *dev, pm_message_t mesg)
{
	ide_drive_t *drive = to_ide_device(dev);
	ide_drive_t *pair = ide_get_pair_dev(drive);
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq;
	struct ide_pm_state rqpm;
	int ret;

	if (ide_port_acpi(hwif)) {
		/* call ACPI _GTM only once */
		if ((drive->dn & 1) == 0 || pair == NULL)
			ide_acpi_get_timing(hwif);
	}

	memset(&rqpm, 0, sizeof(rqpm));
	rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
	scsi_req_init(rq);
	ide_req(rq)->type = ATA_PRIV_PM_SUSPEND;
	rq->special = &rqpm;
	rqpm.pm_step = IDE_PM_START_SUSPEND;
	if (mesg.event == PM_EVENT_PRETHAW)
		mesg.event = PM_EVENT_FREEZE;
	rqpm.pm_state = mesg.event;

	ret = blk_execute_rq(drive->queue, NULL, rq, 0);
	blk_put_request(rq);

	if (ret == 0 && ide_port_acpi(hwif)) {
		/* call ACPI _PS3 only after both devices are suspended */
		if ((drive->dn & 1) || pair == NULL)
			ide_acpi_set_state(hwif, 0);
	}

	return ret;
}

static void ide_end_sync_rq(struct request *rq, int error)
{
	complete(rq->end_io_data);
}

static int ide_pm_execute_rq(struct request *rq)
{
	struct request_queue *q = rq->q;
	DECLARE_COMPLETION_ONSTACK(wait);

	rq->end_io_data = &wait;
	rq->end_io = ide_end_sync_rq;

	spin_lock_irq(q->queue_lock);
	if (unlikely(blk_queue_dying(q))) {
		rq->rq_flags |= RQF_QUIET;
		rq->errors = -ENXIO;
		__blk_end_request_all(rq, rq->errors);
		spin_unlock_irq(q->queue_lock);
		return -ENXIO;
	}
	__elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
	__blk_run_queue_uncond(q);
	spin_unlock_irq(q->queue_lock);

	wait_for_completion_io(&wait);

	return rq->errors ? -EIO : 0;
}

int generic_ide_resume(struct device *dev)
{
	ide_drive_t *drive = to_ide_device(dev);
	ide_drive_t *pair = ide_get_pair_dev(drive);
	ide_hwif_t *hwif = drive->hwif;
	struct request *rq;
	struct ide_pm_state rqpm;
	int err;

	if (ide_port_acpi(hwif)) {
		/* call ACPI _PS0 / _STM only once */
		if ((drive->dn & 1) == 0 || pair == NULL) {
			ide_acpi_set_state(hwif, 1);
			ide_acpi_push_timing(hwif);
		}

		ide_acpi_exec_tfs(drive);
	}

	memset(&rqpm, 0, sizeof(rqpm));
	rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
	scsi_req_init(rq);
	ide_req(rq)->type = ATA_PRIV_PM_RESUME;
	rq->rq_flags |= RQF_PREEMPT;
	rq->special = &rqpm;
	rqpm.pm_step = IDE_PM_START_RESUME;
	rqpm.pm_state = PM_EVENT_ON;

	err = ide_pm_execute_rq(rq);
	blk_put_request(rq);

	if (err == 0 && dev->driver) {
		struct ide_driver *drv = to_ide_driver(dev->driver);

		if (drv->resume)
			drv->resume(drive);
	}

	return err;
}

void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
{
	struct ide_pm_state *pm = rq->special;

#ifdef DEBUG_PM
	printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
		drive->name, pm->pm_step);
#endif
	if (drive->media != ide_disk)
		return;

	switch (pm->pm_step) {
	case IDE_PM_FLUSH_CACHE:	/* Suspend step 1 (flush cache) */
		if (pm->pm_state == PM_EVENT_FREEZE)
			pm->pm_step = IDE_PM_COMPLETED;
		else
			pm->pm_step = IDE_PM_STANDBY;
		break;
	case IDE_PM_STANDBY:		/* Suspend step 2 (standby) */
		pm->pm_step = IDE_PM_COMPLETED;
		break;
	case IDE_PM_RESTORE_PIO:	/* Resume step 1 (restore PIO) */
		pm->pm_step = IDE_PM_IDLE;
		break;
	case IDE_PM_IDLE:		/* Resume step 2 (idle)*/
		pm->pm_step = IDE_PM_RESTORE_DMA;
		break;
	}
}

ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
{
	struct ide_pm_state *pm = rq->special;
	struct ide_cmd cmd = { };

	switch (pm->pm_step) {
	case IDE_PM_FLUSH_CACHE:	/* Suspend step 1 (flush cache) */
		if (drive->media != ide_disk)
			break;
		/* Not supported? Switch to next step now. */
		if (ata_id_flush_enabled(drive->id) == 0 ||
		    (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
			ide_complete_power_step(drive, rq);
			return ide_stopped;
		}
		if (ata_id_flush_ext_enabled(drive->id))
			cmd.tf.command = ATA_CMD_FLUSH_EXT;
		else
			cmd.tf.command = ATA_CMD_FLUSH;
		goto out_do_tf;
	case IDE_PM_STANDBY:		/* Suspend step 2 (standby) */
		cmd.tf.command = ATA_CMD_STANDBYNOW1;
		goto out_do_tf;
	case IDE_PM_RESTORE_PIO:	/* Resume step 1 (restore PIO) */
		ide_set_max_pio(drive);
		/*
		 * skip IDE_PM_IDLE for ATAPI devices
		 */
		if (drive->media != ide_disk)
			pm->pm_step = IDE_PM_RESTORE_DMA;
		else
			ide_complete_power_step(drive, rq);
		return ide_stopped;
	case IDE_PM_IDLE:		/* Resume step 2 (idle) */
		cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
		goto out_do_tf;
	case IDE_PM_RESTORE_DMA:	/* Resume step 3 (restore DMA) */
		/*
		 * Right now, all we do is call ide_set_dma(drive),
		 * we could be smarter and check for current xfer_speed
		 * in struct drive etc...
		 */
		if (drive->hwif->dma_ops == NULL)
			break;
		/*
		 * TODO: respect IDE_DFLAG_USING_DMA
		 */
		ide_set_dma(drive);
		break;
	}

	pm->pm_step = IDE_PM_COMPLETED;

	return ide_stopped;

out_do_tf:
	cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
	cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
	cmd.protocol = ATA_PROT_NODATA;

	return do_rw_taskfile(drive, &cmd);
}

/**
 *	ide_complete_pm_rq - end the current Power Management request
 *	@drive: target drive
 *	@rq: request
 *
 *	This function cleans up the current PM request and stops the queue
 *	if necessary.
 */
void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
{
	struct request_queue *q = drive->queue;
	struct ide_pm_state *pm = rq->special;
	unsigned long flags;

	ide_complete_power_step(drive, rq);
	if (pm->pm_step != IDE_PM_COMPLETED)
		return;

#ifdef DEBUG_PM
	printk("%s: completing PM request, %s\n", drive->name,
	       (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND) ? "suspend" : "resume");
#endif
	spin_lock_irqsave(q->queue_lock, flags);
	if (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND)
		blk_stop_queue(q);
	else
		drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
	spin_unlock_irqrestore(q->queue_lock, flags);

	drive->hwif->rq = NULL;

	if (blk_end_request(rq, 0, 0))
		BUG();
}

void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
{
	struct ide_pm_state *pm = rq->special;

	if (blk_rq_is_private(rq) &&
	    ide_req(rq)->type == ATA_PRIV_PM_SUSPEND &&
	    pm->pm_step == IDE_PM_START_SUSPEND)
		/* Mark drive blocked when starting the suspend sequence. */
		drive->dev_flags |= IDE_DFLAG_BLOCKED;
	else if (blk_rq_is_private(rq) &&
	         ide_req(rq)->type == ATA_PRIV_PM_RESUME &&
		 pm->pm_step == IDE_PM_START_RESUME) {
		/*
		 * The first thing we do on wakeup is to wait for BSY bit to
		 * go away (with a looong timeout) as a drive on this hwif may
		 * just be POSTing itself.
		 * We do that before even selecting as the "other" device on
		 * the bus may be broken enough to walk on our toes at this
		 * point.
		 */
		ide_hwif_t *hwif = drive->hwif;
		const struct ide_tp_ops *tp_ops = hwif->tp_ops;
		struct request_queue *q = drive->queue;
		unsigned long flags;
		int rc;
#ifdef DEBUG_PM
		printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
#endif
		rc = ide_wait_not_busy(hwif, 35000);
		if (rc)
			printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
		tp_ops->dev_select(drive);
		tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
		rc = ide_wait_not_busy(hwif, 100000);
		if (rc)
			printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);

		spin_lock_irqsave(q->queue_lock, flags);
		blk_start_queue(q);
		spin_unlock_irqrestore(q->queue_lock, flags);
	}
}
Commit	Line	Data
e2984c62	1	#include <linux/kernel.h>
5a0e3ad6	2	#include <linux/gfp.h>
e2984c62	3	#include <linux/ide.h>
e2984c62 BZ	4
	5	int generic_ide_suspend(struct device *dev, pm_message_t mesg)
	6	{
9974e43d	7	ide_drive_t *drive = to_ide_device(dev);
fcb52077	8	ide_drive_t *pair = ide_get_pair_dev(drive);
898ec223	9	ide_hwif_t *hwif = drive->hwif;
e2984c62	10	struct request *rq;
a7928c15	11	struct ide_pm_state rqpm;
e2984c62 BZ	12	int ret;
e2984c62 BZ	13
2bf427b2 BZ	14	if (ide_port_acpi(hwif)) {
	15	/* call ACPI _GTM only once */
	16	if ((drive->dn & 1) == 0 \|\| pair == NULL)
	17	ide_acpi_get_timing(hwif);
	18	}
e2984c62 BZ	19
e2984c62 BZ	20	memset(&rqpm, 0, sizeof(rqpm));
aebf526b	21	rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
82ed4db4	22	scsi_req_init(rq);
2f5a8e80	23	ide_req(rq)->type = ATA_PRIV_PM_SUSPEND;
fc38b521	24	rq->special = &rqpm;
e2984c62 BZ	25	rqpm.pm_step = IDE_PM_START_SUSPEND;
	26	if (mesg.event == PM_EVENT_PRETHAW)
	27	mesg.event = PM_EVENT_FREEZE;
	28	rqpm.pm_state = mesg.event;
	29
	30	ret = blk_execute_rq(drive->queue, NULL, rq, 0);
	31	blk_put_request(rq);
	32
2bf427b2 BZ	33	if (ret == 0 && ide_port_acpi(hwif)) {
	34	/* call ACPI _PS3 only after both devices are suspended */
	35	if ((drive->dn & 1) \|\| pair == NULL)
	36	ide_acpi_set_state(hwif, 0);
	37	}
e2984c62 BZ	38
	39	return ret;
	40	}
	41
a7928c15 CH	42	static void ide_end_sync_rq(struct request *rq, int error)
	43	{
	44	complete(rq->end_io_data);
	45	}
	46
	47	static int ide_pm_execute_rq(struct request *rq)
	48	{
	49	struct request_queue *q = rq->q;
	50	DECLARE_COMPLETION_ONSTACK(wait);
	51
	52	rq->end_io_data = &wait;
	53	rq->end_io = ide_end_sync_rq;
	54
	55	spin_lock_irq(q->queue_lock);
	56	if (unlikely(blk_queue_dying(q))) {
e8064021	57	rq->rq_flags \|= RQF_QUIET;
a7928c15 CH	58	rq->errors = -ENXIO;
	59	__blk_end_request_all(rq, rq->errors);
	60	spin_unlock_irq(q->queue_lock);
	61	return -ENXIO;
	62	}
	63	__elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
	64	__blk_run_queue_uncond(q);
	65	spin_unlock_irq(q->queue_lock);
	66
	67	wait_for_completion_io(&wait);
	68
	69	return rq->errors ? -EIO : 0;
	70	}
	71
e2984c62 BZ	72	int generic_ide_resume(struct device *dev)
e2984c62 BZ	73	{
9974e43d	74	ide_drive_t *drive = to_ide_device(dev);
fcb52077	75	ide_drive_t *pair = ide_get_pair_dev(drive);
898ec223	76	ide_hwif_t *hwif = drive->hwif;
e2984c62	77	struct request *rq;
a7928c15	78	struct ide_pm_state rqpm;
e2984c62 BZ	79	int err;
e2984c62 BZ	80
2bf427b2 BZ	81	if (ide_port_acpi(hwif)) {
	82	/* call ACPI _PS0 / _STM only once */
	83	if ((drive->dn & 1) == 0 \|\| pair == NULL) {
	84	ide_acpi_set_state(hwif, 1);
	85	ide_acpi_push_timing(hwif);
	86	}
e2984c62	87
2bf427b2 BZ	88	ide_acpi_exec_tfs(drive);
2bf427b2 BZ	89	}
e2984c62 BZ	90
e2984c62 BZ	91	memset(&rqpm, 0, sizeof(rqpm));
aebf526b	92	rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
82ed4db4	93	scsi_req_init(rq);
2f5a8e80	94	ide_req(rq)->type = ATA_PRIV_PM_RESUME;
e8064021	95	rq->rq_flags \|= RQF_PREEMPT;
fc38b521	96	rq->special = &rqpm;
e2984c62 BZ	97	rqpm.pm_step = IDE_PM_START_RESUME;
	98	rqpm.pm_state = PM_EVENT_ON;
	99
a7928c15	100	err = ide_pm_execute_rq(rq);
e2984c62 BZ	101	blk_put_request(rq);
	102
	103	if (err == 0 && dev->driver) {
7f3c868b	104	struct ide_driver *drv = to_ide_driver(dev->driver);
e2984c62 BZ	105
	106	if (drv->resume)
	107	drv->resume(drive);
	108	}
	109
	110	return err;
	111	}
	112
	113	void ide_complete_power_step(ide_drive_t drive, struct request rq)
	114	{
a7928c15	115	struct ide_pm_state *pm = rq->special;
e2984c62 BZ	116
	117	#ifdef DEBUG_PM
	118	printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
	119	drive->name, pm->pm_step);
	120	#endif
	121	if (drive->media != ide_disk)
	122	return;
	123
	124	switch (pm->pm_step) {
	125	case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
	126	if (pm->pm_state == PM_EVENT_FREEZE)
	127	pm->pm_step = IDE_PM_COMPLETED;
	128	else
	129	pm->pm_step = IDE_PM_STANDBY;
	130	break;
	131	case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
	132	pm->pm_step = IDE_PM_COMPLETED;
	133	break;
	134	case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
	135	pm->pm_step = IDE_PM_IDLE;
	136	break;
	137	case IDE_PM_IDLE: /* Resume step 2 (idle)*/
	138	pm->pm_step = IDE_PM_RESTORE_DMA;
	139	break;
	140	}
	141	}
	142
	143	ide_startstop_t ide_start_power_step(ide_drive_t drive, struct request rq)
	144	{
a7928c15	145	struct ide_pm_state *pm = rq->special;
fc38b521	146	struct ide_cmd cmd = { };
e2984c62 BZ	147
	148	switch (pm->pm_step) {
	149	case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
	150	if (drive->media != ide_disk)
	151	break;
	152	/* Not supported? Switch to next step now. */
	153	if (ata_id_flush_enabled(drive->id) == 0 \|\|
	154	(drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
	155	ide_complete_power_step(drive, rq);
	156	return ide_stopped;
	157	}
	158	if (ata_id_flush_ext_enabled(drive->id))
fc38b521	159	cmd.tf.command = ATA_CMD_FLUSH_EXT;
e2984c62	160	else
fc38b521	161	cmd.tf.command = ATA_CMD_FLUSH;
e2984c62 BZ	162	goto out_do_tf;
e2984c62 BZ	163	case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
fc38b521	164	cmd.tf.command = ATA_CMD_STANDBYNOW1;
e2984c62 BZ	165	goto out_do_tf;
	166	case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
	167	ide_set_max_pio(drive);
	168	/*
	169	* skip IDE_PM_IDLE for ATAPI devices
	170	*/
	171	if (drive->media != ide_disk)
	172	pm->pm_step = IDE_PM_RESTORE_DMA;
	173	else
	174	ide_complete_power_step(drive, rq);
	175	return ide_stopped;
	176	case IDE_PM_IDLE: /* Resume step 2 (idle) */
fc38b521	177	cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
e2984c62 BZ	178	goto out_do_tf;
	179	case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */
	180	/*
	181	* Right now, all we do is call ide_set_dma(drive),
	182	* we could be smarter and check for current xfer_speed
	183	* in struct drive etc...
	184	*/
	185	if (drive->hwif->dma_ops == NULL)
	186	break;
	187	/*
	188	* TODO: respect IDE_DFLAG_USING_DMA
	189	*/
	190	ide_set_dma(drive);
	191	break;
	192	}
	193
	194	pm->pm_step = IDE_PM_COMPLETED;
22aa4b32	195
e2984c62 BZ	196	return ide_stopped;
	197
	198	out_do_tf:
fc38b521 TH	199	cmd.valid.out.tf = IDE_VALID_OUT_TF \| IDE_VALID_DEVICE;
	200	cmd.valid.in.tf = IDE_VALID_IN_TF \| IDE_VALID_DEVICE;
	201	cmd.protocol = ATA_PROT_NODATA;
22aa4b32	202
fc38b521	203	return do_rw_taskfile(drive, &cmd);
e2984c62 BZ	204	}
	205
	206	/**
3616b653	207	* ide_complete_pm_rq - end the current Power Management request
e2984c62 BZ	208	* @drive: target drive
	209	* @rq: request
	210	*
	211	* This function cleans up the current PM request and stops the queue
	212	* if necessary.
	213	*/
3616b653	214	void ide_complete_pm_rq(ide_drive_t drive, struct request rq)
e2984c62 BZ	215	{
e2984c62 BZ	216	struct request_queue *q = drive->queue;
a7928c15	217	struct ide_pm_state *pm = rq->special;
e2984c62 BZ	218	unsigned long flags;
e2984c62 BZ	219
3616b653 BZ	220	ide_complete_power_step(drive, rq);
	221	if (pm->pm_step != IDE_PM_COMPLETED)
	222	return;
	223
e2984c62 BZ	224	#ifdef DEBUG_PM
e2984c62 BZ	225	printk("%s: completing PM request, %s\n", drive->name,
2f5a8e80	226	(ide_req(rq)->type == ATA_PRIV_PM_SUSPEND) ? "suspend" : "resume");
e2984c62 BZ	227	#endif
e2984c62 BZ	228	spin_lock_irqsave(q->queue_lock, flags);
2f5a8e80	229	if (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND)
e2984c62	230	blk_stop_queue(q);
2ea55210	231	else
e2984c62	232	drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
e2984c62 BZ	233	spin_unlock_irqrestore(q->queue_lock, flags);
e2984c62 BZ	234
b65fac32	235	drive->hwif->rq = NULL;
e2984c62 BZ	236
	237	if (blk_end_request(rq, 0, 0))
	238	BUG();
	239	}
	240
	241	void ide_check_pm_state(ide_drive_t drive, struct request rq)
	242	{
a7928c15	243	struct ide_pm_state *pm = rq->special;
e2984c62	244
aebf526b	245	if (blk_rq_is_private(rq) &&
2f5a8e80	246	ide_req(rq)->type == ATA_PRIV_PM_SUSPEND &&
e2984c62 BZ	247	pm->pm_step == IDE_PM_START_SUSPEND)
	248	/* Mark drive blocked when starting the suspend sequence. */
	249	drive->dev_flags \|= IDE_DFLAG_BLOCKED;
aebf526b	250	else if (blk_rq_is_private(rq) &&
2f5a8e80	251	ide_req(rq)->type == ATA_PRIV_PM_RESUME &&
e2984c62 BZ	252	pm->pm_step == IDE_PM_START_RESUME) {
	253	/*
	254	* The first thing we do on wakeup is to wait for BSY bit to
	255	* go away (with a looong timeout) as a drive on this hwif may
	256	* just be POSTing itself.
	257	* We do that before even selecting as the "other" device on
	258	* the bus may be broken enough to walk on our toes at this
	259	* point.
	260	*/
	261	ide_hwif_t *hwif = drive->hwif;
fdd88f0a	262	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
2ea55210 BZ	263	struct request_queue *q = drive->queue;
2ea55210 BZ	264	unsigned long flags;
e2984c62 BZ	265	int rc;
	266	#ifdef DEBUG_PM
	267	printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
	268	#endif
	269	rc = ide_wait_not_busy(hwif, 35000);
	270	if (rc)
	271	printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
fdd88f0a SS	272	tp_ops->dev_select(drive);
fdd88f0a SS	273	tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
e2984c62 BZ	274	rc = ide_wait_not_busy(hwif, 100000);
	275	if (rc)
	276	printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
2ea55210 BZ	277
	278	spin_lock_irqsave(q->queue_lock, flags);
	279	blk_start_queue(q);
	280	spin_unlock_irqrestore(q->queue_lock, flags);
e2984c62 BZ	281	}
e2984c62 BZ	282	}