linux-kernel - [PATCH RFC 1/4] vdpa: introduce .reset

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Date:   Mon, 14 Aug 2023 18:43:24 -0700
From:   Si-Wei Liu <si-wei.liu@...cle.com>
To:     jasowang@...hat.com
Cc:     eperezma@...hat.com, gal@...dia.com, linux-kernel@...r.kernel.org,
        mst@...hat.com, si-wei.liu@...cle.com,
        virtualization@...ts.linux-foundation.org,
        xuanzhuo@...ux.alibaba.com
Subject: [PATCH RFC 1/4] vdpa: introduce .reset_map operation callback

Signed-off-by: Si-Wei Liu <si-wei.liu@...cle.com>
---
 include/linux/vdpa.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index db1b0ea..3a3878d 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -314,6 +314,12 @@ struct vdpa_map_file {
  *				@iova: iova to be unmapped
  *				@size: size of the area
  *				Returns integer: success (0) or error (< 0)
+ * @reset_map:			Reset device memory mapping (optional)
+ *				Needed for device that using device
+ *				specific DMA translation (on-chip IOMMU)
+ *				@vdev: vdpa device
+ *				@asid: address space identifier
+ *				Returns integer: success (0) or error (< 0)
  * @get_vq_dma_dev:		Get the dma device for a specific
  *				virtqueue (optional)
  *				@vdev: vdpa device
@@ -390,6 +396,7 @@ struct vdpa_config_ops {
 		       u64 iova, u64 size, u64 pa, u32 perm, void *opaque);
 	int (*dma_unmap)(struct vdpa_device *vdev, unsigned int asid,
 			 u64 iova, u64 size);
+	int (*reset_map)(struct vdpa_device *vdev, unsigned int asid);
 	int (*set_group_asid)(struct vdpa_device *vdev, unsigned int group,
 			      unsigned int asid);
 	struct device *(*get_vq_dma_dev)(struct vdpa_device *vdev, u16 idx);
-- 
1.8.3.1