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| author | Dave Airlie <airlied@redhat.com> | 2012-05-20 12:33:56 +0530 |
|---|---|---|
| committer | Sumit Semwal <sumit.semwal@ti.com> | 2012-05-25 12:35:24 +0530 |
| commit | 98f86c9e4ae3205e4c85c535691a5d36426360ee (patch) | |
| tree | 07a533aaf702c8b0a0f6ffb0b0ee2ae6e4fe62e3 /include/linux/dma-buf.h | |
| parent | 4c78513e457f72d5554a0f6e2eabfad7b98e4f19 (diff) | |
| download | op-kernel-dev-98f86c9e4ae3205e4c85c535691a5d36426360ee.zip op-kernel-dev-98f86c9e4ae3205e4c85c535691a5d36426360ee.tar.gz | |
dma-buf: add vmap interface
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>
Diffstat (limited to 'include/linux/dma-buf.h')
| -rw-r--r-- | include/linux/dma-buf.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index 1f78d15..a02b1ff 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -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__ */ |
