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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-hyperv@vger.kernel.org,
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Cc: ssengar@microsoft.com
Subject: [PATCH 2/6] uio_hv_generic: Query the ringbuffer size for device
Date: Sat, 17 Feb 2024 10:03:36 -0800
Message-Id: <1708193020-14740-3-git-send-email-ssengar@linux.microsoft.com>
In-Reply-To: <1708193020-14740-1-git-send-email-ssengar@linux.microsoft.com>
References: <1708193020-14740-1-git-send-email-ssengar@linux.microsoft.com>
Precedence: bulk

Query the ring buffer size from pre defined table per device.
Keep the size as is if the device doesn't have any preferred
ring size.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
---
 drivers/uio/uio_hv_generic.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
index 20d9762331bd..4bda6b52e49e 100644
--- a/drivers/uio/uio_hv_generic.c
+++ b/drivers/uio/uio_hv_generic.c
@@ -238,6 +238,7 @@ hv_uio_probe(struct hv_device *dev,
 	struct hv_uio_private_data *pdata;
 	void *ring_buffer;
 	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) {
@@ -245,12 +246,14 @@ hv_uio_probe(struct hv_device *dev,
 		return -ENOTSUPP;
 	}
 
+	if (!ring_size)
+		ring_size = HV_RING_SIZE * PAGE_SIZE;
+
 	pdata = devm_kzalloc(&dev->device, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return -ENOMEM;
 
-	ret = vmbus_alloc_ring(channel, HV_RING_SIZE * PAGE_SIZE,
-			       HV_RING_SIZE * PAGE_SIZE);
+	ret = vmbus_alloc_ring(channel, ring_size, ring_size);
 	if (ret)
 		return ret;
 
-- 
2.34.1