From: Saurabh Sengar <ssengar@linux.microsoft.com>
To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org,
decui@microsoft.com, gregkh@linuxfoundation.org,
linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org
Cc: longli@microsoft.com, ssengar@microsoft.com
Subject: [PATCH v3 3/7] uio_hv_generic: Enable interrupt for low speed VMBus devices
Date: Sat, 30 Mar 2024 01:51:59 -0700 [thread overview]
Message-ID: <1711788723-8593-4-git-send-email-ssengar@linux.microsoft.com> (raw)
In-Reply-To: <1711788723-8593-1-git-send-email-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>
Reviewed-by: Long Li <longli@microsoft.com>
---
[V2]
- Added Reviewed-by form Long Li
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
next prev parent reply other threads:[~2024-03-30 8:52 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-30 8:51 [PATCH v3 0/7] Low speed Hyper-V devices support Saurabh Sengar
2024-03-30 8:51 ` [PATCH v3 1/7] Drivers: hv: vmbus: Add utility function for querying ring size Saurabh Sengar
2024-03-30 8:51 ` [PATCH v3 2/7] uio_hv_generic: Query the ringbuffer size for device Saurabh Sengar
2024-03-30 8:51 ` Saurabh Sengar [this message]
2024-03-30 8:52 ` [PATCH v3 4/7] tools: hv: Add vmbus_bufring Saurabh Sengar
2024-03-30 8:52 ` [PATCH v3 5/7] tools: hv: Add new fcopy application based on uio driver Saurabh Sengar
2024-04-03 17:54 ` Long Li
2024-03-30 8:52 ` [PATCH v3 6/7] Drivers: hv: Remove fcopy driver Saurabh Sengar
2024-03-30 8:52 ` [PATCH v3 7/7] uio_hv_generic: Remove use of PAGE_SIZE Saurabh Sengar
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