Commit 9b847548 authored by Jens Axboe's avatar Jens Axboe Committed by Linus Torvalds
Browse files

[PATCH] Suspend support for libata 



This patch adds suspend patch to libata, and ata_piix in particular. For
most low level drivers, they should just need to add the 4 hooks to
work. As I can only test ata_piix, I didn't enable it for more
though.

Suspend support is the single most important feature on a notebook, and
most new notebooks have sata drives. It's quite embarrassing that we
_still_ do not support this. Right now, it's perfectly possible to
suspend the drive in mid-transfer.

Signed-off-by: default avatarJens Axboe <axboe@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 88202a0c

drivers/scsi/ata_piix.c

+4 −0
Original line number Diff line number Diff line
@@ -166,6 +166,8 @@ static struct pci_driver piix_pci_driver = { 
	.id_table		= piix_pci_tbl,

	.probe			= piix_init_one,

	.remove			= ata_pci_remove_one,

	.suspend		= ata_pci_device_suspend,

	.resume			= ata_pci_device_resume,

};



static struct scsi_host_template piix_sht = {
@@ -186,6 +188,8 @@ static struct scsi_host_template piix_sht = { 
	.slave_configure	= ata_scsi_slave_config,

	.bios_param		= ata_std_bios_param,

	.ordered_flush		= 1,

	.resume			= ata_scsi_device_resume,

	.suspend		= ata_scsi_device_suspend,

};



static const struct ata_port_operations piix_pata_ops = {

drivers/scsi/libata-core.c

+114 −0
Original line number Diff line number Diff line
@@ -4154,6 +4154,96 @@ err_out: 
 *	Inherited from caller.

 */



/*

 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,

 * without filling any other registers

 */

static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,

			     u8 cmd)

{

	struct ata_taskfile tf;

	int err;



	ata_tf_init(ap, &tf, dev->devno);



	tf.command = cmd;

	tf.flags |= ATA_TFLAG_DEVICE;

	tf.protocol = ATA_PROT_NODATA;



	err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);

	if (err)

		printk(KERN_ERR "%s: ata command failed: %d\n",

				__FUNCTION__, err);



	return err;

}



static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)

{

	u8 cmd;



	if (!ata_try_flush_cache(dev))

		return 0;



	if (ata_id_has_flush_ext(dev->id))

		cmd = ATA_CMD_FLUSH_EXT;

	else

		cmd = ATA_CMD_FLUSH;



	return ata_do_simple_cmd(ap, dev, cmd);

}



static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)

{

	return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);

}



static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)

{

	return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);

}



/**

 *	ata_device_resume - wakeup a previously suspended devices

 *

 *	Kick the drive back into action, by sending it an idle immediate

 *	command and making sure its transfer mode matches between drive

 *	and host.

 *

 */

int ata_device_resume(struct ata_port *ap, struct ata_device *dev)

{

	if (ap->flags & ATA_FLAG_SUSPENDED) {

		ap->flags &= ~ATA_FLAG_SUSPENDED;

		ata_set_mode(ap);

	}

	if (!ata_dev_present(dev))

		return 0;

	if (dev->class == ATA_DEV_ATA)

		ata_start_drive(ap, dev);



	return 0;

}



/**

 *	ata_device_suspend - prepare a device for suspend

 *

 *	Flush the cache on the drive, if appropriate, then issue a

 *	standbynow command.

 *

 */

int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)

{

	if (!ata_dev_present(dev))

		return 0;

	if (dev->class == ATA_DEV_ATA)

		ata_flush_cache(ap, dev);



	ata_standby_drive(ap, dev);

	ap->flags |= ATA_FLAG_SUSPENDED;

	return 0;

}



int ata_port_start (struct ata_port *ap)

{

	struct device *dev = ap->host_set->dev;
@@ -4902,6 +4992,23 @@ int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits) 


	return (tmp == bits->val) ? 1 : 0;

}



int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)

{

	pci_save_state(pdev);

	pci_disable_device(pdev);

	pci_set_power_state(pdev, PCI_D3hot);

	return 0;

}



int ata_pci_device_resume(struct pci_dev *pdev)

{

	pci_set_power_state(pdev, PCI_D0);

	pci_restore_state(pdev);

	pci_enable_device(pdev);

	pci_set_master(pdev);

	return 0;

}

#endif /* CONFIG_PCI */
@@ -5005,4 +5112,11 @@ EXPORT_SYMBOL_GPL(ata_pci_host_stop); 
EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);

EXPORT_SYMBOL_GPL(ata_pci_init_one);

EXPORT_SYMBOL_GPL(ata_pci_remove_one);

EXPORT_SYMBOL_GPL(ata_pci_device_suspend);

EXPORT_SYMBOL_GPL(ata_pci_device_resume);

#endif /* CONFIG_PCI */



EXPORT_SYMBOL_GPL(ata_device_suspend);

EXPORT_SYMBOL_GPL(ata_device_resume);

EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);

EXPORT_SYMBOL_GPL(ata_scsi_device_resume);

drivers/scsi/libata-scsi.c

+16 −0
Original line number Diff line number Diff line
@@ -396,6 +396,22 @@ void ata_dump_status(unsigned id, struct ata_taskfile *tf) 
	}

}



int ata_scsi_device_resume(struct scsi_device *sdev)

{

	struct ata_port *ap = (struct ata_port *) &sdev->host->hostdata[0];

	struct ata_device *dev = &ap->device[sdev->id];



	return ata_device_resume(ap, dev);

}



int ata_scsi_device_suspend(struct scsi_device *sdev)

{

	struct ata_port *ap = (struct ata_port *) &sdev->host->hostdata[0];

	struct ata_device *dev = &ap->device[sdev->id];



	return ata_device_suspend(ap, dev);

}



/**

 *	ata_to_sense_error - convert ATA error to SCSI error

 *	@id: ATA device number

drivers/scsi/scsi_sysfs.c

+31 −0
Original line number Diff line number Diff line
@@ -263,9 +263,40 @@ static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 
	return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;

}



static int scsi_bus_suspend(struct device * dev, pm_message_t state)

{

	struct scsi_device *sdev = to_scsi_device(dev);

	struct scsi_host_template *sht = sdev->host->hostt;

	int err;



	err = scsi_device_quiesce(sdev);

	if (err)

		return err;



	if (sht->suspend)

		err = sht->suspend(sdev);



	return err;

}



static int scsi_bus_resume(struct device * dev)

{

	struct scsi_device *sdev = to_scsi_device(dev);

	struct scsi_host_template *sht = sdev->host->hostt;

	int err = 0;



	if (sht->resume)

		err = sht->resume(sdev);



	scsi_device_resume(sdev);

	return err;

}



struct bus_type scsi_bus_type = {

        .name		= "scsi",

        .match		= scsi_bus_match,

	.suspend	= scsi_bus_suspend,

	.resume		= scsi_bus_resume,

};



int scsi_sysfs_register(void)

include/linux/ata.h

+2 −0
Original line number Diff line number Diff line
@@ -141,6 +141,8 @@ enum { 
	ATA_CMD_PACKET		= 0xA0,

	ATA_CMD_VERIFY		= 0x40,

	ATA_CMD_VERIFY_EXT	= 0x42,

 	ATA_CMD_STANDBYNOW1	= 0xE0,

 	ATA_CMD_IDLEIMMEDIATE	= 0xE1,

	ATA_CMD_INIT_DEV_PARAMS	= 0x91,



	/* SETFEATURES stuff */

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