[RFC 05/12] scsi: storvsc: Annotate the VMBus channel IRQ name

[mhkelley58@gmail.com]

From: Michael Kelley <mhklinux@outlook.com>

In preparation for assigning Linux IRQs to VMBus channels, annotate the
IRQ name in the VMBus channels used by the virtual IDE, SCSI, and Fibre
Channel controllers in a Hyper-V guest. Distinguish the primary channel
and sub-channels with "pri" and "sub" prefixes. Identify controllers
with a numeric suffix that matches the numeric part of the "host<n>"
name displayed by "lsscsi" and SCSI-related entries in sysfs.

Signed-off-by: Michael Kelley <mhklinux@outlook.com>
---
 drivers/scsi/storvsc_drv.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 7ceb982040a5..11b3fc3b24c9 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -686,6 +686,8 @@ static void handle_sc_creation(struct vmbus_channel *new_sc)
 	new_sc->max_pkt_size = STORVSC_MAX_PKT_SIZE;
 
 	new_sc->next_request_id_callback = storvsc_next_request_id;
+	snprintf(new_sc->irq_name, VMBUS_CHAN_IRQ_NAME_MAX, "sub@storvsc%d",
+			stor_device->host->host_no);
 
 	ret = vmbus_open(new_sc,
 			 aligned_ringbuffer_size,
@@ -1322,6 +1324,7 @@ static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size,
 				  bool is_fc)
 {
 	struct vmstorage_channel_properties props;
+	struct storvsc_device *stor_device;
 	int ret;
 
 	memset(&props, 0, sizeof(struct vmstorage_channel_properties));
@@ -1329,6 +1332,12 @@ static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size,
 	device->channel->max_pkt_size = STORVSC_MAX_PKT_SIZE;
 	device->channel->next_request_id_callback = storvsc_next_request_id;
 
+	stor_device = get_out_stor_device(device);
+	if (!stor_device)
+		return -EINVAL;
+	snprintf(device->channel->irq_name, VMBUS_CHAN_IRQ_NAME_MAX, "pri@storvsc%d",
+			stor_device->host->host_no);
+
 	ret = vmbus_open(device->channel,
 			 ring_size,
 			 ring_size,
-- 
2.25.1