On Mon, Feb 26, 2024 at 07:39:09PM +0800, Xuan Zhuo wrote:

On Mon, 26 Feb 2024 06:36:53 -0500, "Michael S. Tsirkin" [off-list ref] wrote:

quoted

On Mon, Feb 26, 2024 at 07:33:29PM +0800, Xuan Zhuo wrote:

quoted

quoted

what is dma_map_direct? can't find it in the tree.

YES.

diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 58db8fd70471..5a8f7a927aa1 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c

@@ -144,6 +144,18 @@ static inline bool dma_map_direct(struct device *dev,
        return dma_go_direct(dev, *dev->dma_mask, ops);
 }

+bool dma_is_direct(struct device *dev)
+{
+       if (!dma_map_direct(dev, ops))
+               return false;
+
+       if (is_swiotlb_force_bounce(dev))
+               return false;
+
+       return true;
+}
+EXPORT_SYMBOL(dma_unmap_page_attrs);
+

Thanks.

where is it? linux-next?

I see it in the vhost branch kernel/dma/mapping.c.

Maybe you miss it.

Thanks.

which hash?

quoted

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MST