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>

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 542d2ba..f8faf8b 100644 (file)
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -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,
        },