2012/7/10, Cooper Yuan <cooperyuan@xxxxxxxxx>:
> Implement kmap/kmap_atomic, kunmap/kunmap_atomic functions of dma_buf_ops.
>
> Signed-off-by: Cooper Yuan <cooperyuan@xxxxxxxxx>
> ---
> drivers/gpu/drm/exynos/exynos_drm_dmabuf.c | 17 +++++++++++------
> 1 files changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
> b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
> index 913a23e..805b344 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
> @@ -138,30 +138,35 @@ static void exynos_dmabuf_release(struct dma_buf
> *dmabuf)
> static void *exynos_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
> unsigned long page_num)
> {
> - /* TODO */
> + struct exynos_drm_gem_obj *exynos_gem_obj = dma_buf->priv;
> + struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
>
> - return NULL;
kmap is used for cpu access so you should consider cache operation (dev to cpu).
> + return kmap_atomic(buf->pages[page_num]);
> }
>
> static void exynos_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
> unsigned long page_num,
> void *addr)
> {
> - /* TODO */
> + kunmap_atomic(addr);
> }
>
> static void *exynos_gem_dmabuf_kmap(struct dma_buf *dma_buf,
> unsigned long page_num)
> {
> - /* TODO */
> + struct exynos_drm_gem_obj *exynos_gem_obj = dma_buf->priv;
> + struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
>
> - return NULL;
ditto.
> + return kmap(buf->pages[page_num]);
> }
>
> static void exynos_gem_dmabuf_kunmap(struct dma_buf *dma_buf,
> unsigned long page_num, void *addr)
> {
> - /* TODO */
> + struct exynos_drm_gem_obj *exynos_gem_obj = dma_buf->priv;
> + struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
> +
> + kunmap(buf->pages[page_num]);
> }
>
> static int exynos_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct
> vm_area_struct *vma)
> --
> 1.7.0.4
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>
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