linux-kernel - [PATCH v2] vdpa/vp_vdpa: implement kick_vq_with

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Message-Id: <20241203023743.1757-1-yuxue.liu@jaguarmicro.com>
Date: Tue,  3 Dec 2024 10:37:43 +0800
From: "Yuxue Liu yuxue.liu@...uarmicro.com" <yuxue.liu@...uarmicro.com>
To: jasowang@...hat.com,
	lkp@...el.com
Cc: mst@...hat.com,
	angus.chen@...uarmicro.com,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux.dev,
	xuanzhuo@...ux.alibaba.com,
	oe-kbuild-all@...ts.linux.dev,
	llvm@...ts.linux.dev,
	yuxue.liu@...uarmicro.com
Subject: [PATCH v2] vdpa/vp_vdpa: implement kick_vq_with_data callback

From: Yuxue Liu <yuxue.liu@...uarmicro.com>

Implement the kick_vq_with_data vDPA callback.
On kick, we pass the next available data to the hardware by writing it in
the kick offset.

Signed-off-by: Yuxue Liu <yuxue.liu@...uarmicro.com>
---
v2: fix build error for kernel test robot

 drivers/vdpa/virtio_pci/vp_vdpa.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/vdpa/virtio_pci/vp_vdpa.c b/drivers/vdpa/virtio_pci/vp_vdpa.c
index 16380764275e..8787407f75b0 100644
--- a/drivers/vdpa/virtio_pci/vp_vdpa.c
+++ b/drivers/vdpa/virtio_pci/vp_vdpa.c
@@ -367,6 +367,14 @@ static void vp_vdpa_kick_vq(struct vdpa_device *vdpa, u16 qid)
 	vp_iowrite16(qid, vp_vdpa->vring[qid].notify);
 }
 
+static void vp_vdpa_kick_vq_with_data(struct vdpa_device *vdpa, u32 data)
+{
+	struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
+	u16 qid = data & 0xFFFF;
+
+	vp_iowrite32(data, vp_vdpa->vring[qid].notify);
+}
+
 static u32 vp_vdpa_get_generation(struct vdpa_device *vdpa)
 {
 	struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa);
@@ -472,6 +480,7 @@ static const struct vdpa_config_ops vp_vdpa_ops = {
 	.get_vq_size	= vp_vdpa_get_vq_size,
 	.set_vq_address	= vp_vdpa_set_vq_address,
 	.kick_vq	= vp_vdpa_kick_vq,
+	.kick_vq_with_data      = vp_vdpa_kick_vq_with_data,
 	.get_generation	= vp_vdpa_get_generation,
 	.get_device_id	= vp_vdpa_get_device_id,
 	.get_vendor_id	= vp_vdpa_get_vendor_id,
-- 
2.34.1