[PATCH 3/6] uio_hv_generic: Enable interrupt for low speed VMBus devices

[Saurabh Sengar <ssengar@linux.microsoft.com>]

Hyper-V is adding some "specialty" synthetic devices. Instead of writing
new kernel-level VMBus drivers for these devices, the devices will be
presented to user space via this existing Hyper-V generic UIO driver, so
that a user space driver can handle the device. Since these new synthetic
devices are low speed devices, they don't support monitor bits and we must
use vmbus_setevent() to enable interrupts from the host.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
---
 drivers/uio/uio_hv_generic.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
index 4bda6b52e49e..289611c7dfd7 100644
--- a/drivers/uio/uio_hv_generic.c
+++ b/drivers/uio/uio_hv_generic.c
@@ -84,6 +84,9 @@ hv_uio_irqcontrol(struct uio_info *info, s32 irq_state)
 	dev->channel->inbound.ring_buffer->interrupt_mask = !irq_state;
 	virt_mb();
 
+	if (!dev->channel->offermsg.monitor_allocated && irq_state)
+		vmbus_setevent(dev->channel);
+
 	return 0;
 }
 
@@ -240,12 +243,6 @@ hv_uio_probe(struct hv_device *dev,
 	int ret;
 	size_t ring_size = hv_dev_ring_size(channel);
 
-	/* Communicating with host has to be via shared memory not hypercall */
-	if (!channel->offermsg.monitor_allocated) {
-		dev_err(&dev->device, "vmbus channel requires hypercall\n");
-		return -ENOTSUPP;
-	}
-
 	if (!ring_size)
 		ring_size = HV_RING_SIZE * PAGE_SIZE;
 
-- 
2.34.1