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dma-buf: add vmap interface

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The main requirement I have for this interface is for scanning out
using the USB gpu devices. Since these devices have to read the
framebuffer on updates and linearly compress it, using kmaps
is a major overhead for every update.

v2: fix warn issues pointed out by Sylwester Nawrocki.

v3: fix compile !CONFIG_DMA_SHARED_BUFFER and add _GPL for now

Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Rob Clark <rob.clark@linaro.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
This commit is contained in:
Dave Airlie
2012-05-20 12:33:56 +05:30
committed by Sumit Semwal
parent 4c78513e45
commit 98f86c9e4a
2 changed files with 48 additions and 0 deletions
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include/linux/dma-buf.h
+14
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@@ -98,6 +98,9 @@ struct dma_buf_ops {
void (*kunmap)(struct dma_buf *, unsigned long, void *);
int (*mmap)(struct dma_buf *, struct vm_area_struct *vma);
void *(*vmap)(struct dma_buf *);
void (*vunmap)(struct dma_buf *, void *vaddr);
};
/**
@@ -176,6 +179,8 @@ void dma_buf_kunmap(struct dma_buf *, unsigned long, void *);
int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *,
unsigned long);
void *dma_buf_vmap(struct dma_buf *);
void dma_buf_vunmap(struct dma_buf *, void *vaddr);
#else
static inline struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
@@ -264,6 +269,15 @@ static inline int dma_buf_mmap(struct dma_buf *dmabuf,
{
return -ENODEV;
}
static inline void *dma_buf_vmap(struct dma_buf *dmabuf)
{
return NULL;
}
static inline void dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr)
{
}
#endif /* CONFIG_DMA_SHARED_BUFFER */
#endif /* __DMA_BUF_H__ */