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

mhkelley58
2024-06-04T05:10:43Z

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