Commit e468dc11 authored by Artur Wojcik's avatar Artur Wojcik Committed by James Bottomley
Browse files

[SCSI] isci: implement suspend/resume support 



Provide a "simple-dev-pm-ops" implementation that shuts down the domain
and the device on suspend, and resumes the device and the domain on
resume.  All of the mechanics of restoring domain connectivity are
handled by libsas once isci has notified libsas that all links should be
back up.  libsas is in charge of handling links that did not resume, or
resumed out of order.

Signed-off-by: default avatarArtur Wojcik <artur.wojcik@intel.com>
Signed-off-by: default avatarJacek Danecki <jacek.danecki@intel.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent 303694ee

drivers/scsi/isci/host.c

+1 −1
Original line number Diff line number Diff line
@@ -1044,7 +1044,7 @@ static enum sci_status sci_controller_start(struct isci_host *ihost, 
	return SCI_SUCCESS;

}



void isci_host_scan_start(struct Scsi_Host *shost)

void isci_host_start(struct Scsi_Host *shost)

{

	struct isci_host *ihost = SHOST_TO_SAS_HA(shost)->lldd_ha;

	unsigned long tmo = sci_controller_get_suggested_start_timeout(ihost);

drivers/scsi/isci/host.h

+1 −1
Original line number Diff line number Diff line
@@ -473,7 +473,7 @@ void sci_controller_remote_device_stopped(struct isci_host *ihost, 


enum sci_status sci_controller_continue_io(struct isci_request *ireq);

int isci_host_scan_finished(struct Scsi_Host *, unsigned long);

void isci_host_scan_start(struct Scsi_Host *);

void isci_host_start(struct Scsi_Host *);

u16 isci_alloc_tag(struct isci_host *ihost);

enum sci_status isci_free_tag(struct isci_host *ihost, u16 io_tag);

void isci_tci_free(struct isci_host *ihost, u16 tci);

drivers/scsi/isci/init.c

+57 −1
Original line number Diff line number Diff line
@@ -156,7 +156,7 @@ static struct scsi_host_template isci_sht = { 
	.target_alloc			= sas_target_alloc,

	.slave_configure		= sas_slave_configure,

	.scan_finished			= isci_host_scan_finished,

	.scan_start			= isci_host_scan_start,

	.scan_start			= isci_host_start,

	.change_queue_depth		= sas_change_queue_depth,

	.change_queue_type		= sas_change_queue_type,

	.bios_param			= sas_bios_param,
@@ -722,11 +722,67 @@ static void __devexit isci_pci_remove(struct pci_dev *pdev) 
	}

}



#ifdef CONFIG_PM

static int isci_suspend(struct device *dev)

{

	struct pci_dev *pdev = to_pci_dev(dev);

	struct isci_host *ihost;

	int i;



	for_each_isci_host(i, ihost, pdev) {

		sas_suspend_ha(&ihost->sas_ha);

		isci_host_deinit(ihost);

	}



	pci_save_state(pdev);

	pci_disable_device(pdev);

	pci_set_power_state(pdev, PCI_D3hot);



	return 0;

}



static int isci_resume(struct device *dev)

{

	struct pci_dev *pdev = to_pci_dev(dev);

	struct isci_host *ihost;

	int rc, i;



	pci_set_power_state(pdev, PCI_D0);

	pci_restore_state(pdev);



	rc = pcim_enable_device(pdev);

	if (rc) {

		dev_err(&pdev->dev,

			"enabling device failure after resume(%d)\n", rc);

		return rc;

	}



	pci_set_master(pdev);



	for_each_isci_host(i, ihost, pdev) {

		sas_prep_resume_ha(&ihost->sas_ha);



		isci_host_init(ihost);

		isci_host_start(ihost->sas_ha.core.shost);

		wait_for_start(ihost);



		sas_resume_ha(&ihost->sas_ha);

	}



	return 0;

}



static SIMPLE_DEV_PM_OPS(isci_pm_ops, isci_suspend, isci_resume);

#endif



static struct pci_driver isci_pci_driver = {

	.name		= DRV_NAME,

	.id_table	= isci_id_table,

	.probe		= isci_pci_probe,

	.remove		= __devexit_p(isci_pci_remove),

#ifdef CONFIG_PM

	.driver.pm      = &isci_pm_ops,

#endif

};



static __init int isci_init(void)

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