On 2020/12/22 下午10:52, Xie Yongji wrote:
This patch introduces a new method in the vdpa_config_ops to
support processing the raw vhost memory mapping message in the
vDPA device driver.
Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
---
drivers/vhost/vdpa.c | 5 ++++-
include/linux/vdpa.h | 7 +++++++
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 448be7875b6d..ccbb391e38be 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -728,6 +728,9 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
if (r)
return r;
+ if (ops->process_iotlb_msg)
+ return ops->process_iotlb_msg(vdpa, msg);
+
switch (msg->type) {
case VHOST_IOTLB_UPDATE:
r = vhost_vdpa_process_iotlb_update(v, msg);
@@ -770,7 +773,7 @@ static int vhost_vdpa_alloc_domain(struct vhost_vdpa *v)
int ret;
/* Device want to do DMA by itself */
- if (ops->set_map || ops->dma_map)
+ if (ops->set_map || ops->dma_map || ops->process_iotlb_msg)
return 0;
bus = dma_dev->bus;
diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 656fe264234e..7bccedf22f4b 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -5,6 +5,7 @@
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/interrupt.h>
+#include <linux/vhost_types.h>
#include <linux/vhost_iotlb.h>
#include <net/genetlink.h>
@@ -172,6 +173,10 @@ struct vdpa_iova_range {
* @vdev: vdpa device
* Returns the iova range supported by
* the device.
+ * @process_iotlb_msg: Process vhost memory mapping message (optional)
+ * Only used for VDUSE device now
+ * @vdev: vdpa device
+ * @msg: vhost memory mapping message
* @set_map: Set device memory mapping (optional)
* Needed for device that using device
* specific DMA translation (on-chip IOMMU)
@@ -240,6 +245,8 @@ struct vdpa_config_ops {
struct vdpa_iova_range (*get_iova_range)(struct vdpa_device *vdev);
/* DMA ops */
+ int (*process_iotlb_msg)(struct vdpa_device *vdev,
+ struct vhost_iotlb_msg *msg);
int (*set_map)(struct vdpa_device *vdev, struct vhost_iotlb *iotlb);
int (*dma_map)(struct vdpa_device *vdev, u64 iova, u64 size,
u64 pa, u32 perm);
Is there any reason that it can't be done via dma_map/dma_unmap or set_map?
Thanks
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