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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: Dexuan Cui <decui@microsoft.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dexuan Cui 2019-09-11 23:35:16 +00:00 committed by Sasha Levin
parent 931cccc967
commit 56fb105859
1 changed files with 41 additions and 0 deletions
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41
drivers/scsi/storvsc_drv.c
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@ -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,
},