Commit 56fb1058 authored by Dexuan Cui's avatar Dexuan Cui Committed by Sasha Levin
Browse files

scsi: storvsc: Add the support of hibernation 



When we're in storvsc_suspend(), we're sure the SCSI layer has quiesced the
scsi device by scsi_bus_suspend() -> ... -> scsi_device_quiesce(), so the
low level SCSI adapter driver only needs to suspend/resume its own state.

Signed-off-by: default avatarDexuan Cui <decui@microsoft.com>
Acked-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 931cccc9

drivers/scsi/storvsc_drv.c

+41 −0
Original line number Diff line number Diff line
@@ -1727,6 +1727,13 @@ static const struct hv_vmbus_device_id id_table[] = { 


MODULE_DEVICE_TABLE(vmbus, id_table);



static const struct { guid_t guid; } fc_guid = { HV_SYNTHFC_GUID };



static bool hv_dev_is_fc(struct hv_device *hv_dev)

{

	return guid_equal(&fc_guid.guid, &hv_dev->dev_type);

}



static int storvsc_probe(struct hv_device *device,

			const struct hv_vmbus_device_id *dev_id)

{
@@ -1934,11 +1941,45 @@ static int storvsc_remove(struct hv_device *dev) 
	return 0;

}



static int storvsc_suspend(struct hv_device *hv_dev)

{

	struct storvsc_device *stor_device = hv_get_drvdata(hv_dev);

	struct Scsi_Host *host = stor_device->host;

	struct hv_host_device *host_dev = shost_priv(host);



	storvsc_wait_to_drain(stor_device);



	drain_workqueue(host_dev->handle_error_wq);



	vmbus_close(hv_dev->channel);



	memset(stor_device->stor_chns, 0,

	       num_possible_cpus() * sizeof(void *));



	kfree(stor_device->stor_chns);

	stor_device->stor_chns = NULL;



	cpumask_clear(&stor_device->alloced_cpus);



	return 0;

}



static int storvsc_resume(struct hv_device *hv_dev)

{

	int ret;



	ret = storvsc_connect_to_vsp(hv_dev, storvsc_ringbuffer_size,

				     hv_dev_is_fc(hv_dev));

	return ret;

}



static struct hv_driver storvsc_drv = {

	.name = KBUILD_MODNAME,

	.id_table = id_table,

	.probe = storvsc_probe,

	.remove = storvsc_remove,

	.suspend = storvsc_suspend,

	.resume = storvsc_resume,

	.driver = {

		.probe_type = PROBE_PREFER_ASYNCHRONOUS,

	},

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