On Tue, Jul 10, 2012 at 8:32 AM, Cooper Yuan cooperyuan@gmail.com wrote:
implement mmap function of dma_buf_ops.
Signed-off-by: Cooper Yuan cooperyuan@gmail.com
drivers/gpu/drm/exynos/exynos_drm_dmabuf.c | 38 ++++++++++++++++++++++++++++ 1 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c index e4eeb0b..913a23e 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c +++ b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c @@ -164,6 +164,43 @@ static void exynos_gem_dmabuf_kunmap(struct dma_buf *dma_buf, /* TODO */ }
+static int exynos_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
btw, both this function and the omap version are similar to drm_gem_mmap().. probably there is some room here to extract a common helper fxn
BR, -R
+{
struct exynos_drm_gem_obj *exynos_gem_obj = dma_buf->priv;struct drm_device *dev = exynos_gem_obj->base.dev;struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;int ret = 0;if (WARN_ON(!exynos_gem_obj->base.filp))return -EINVAL;/* Check for valid size. */if (buf->size < vma->vm_end - vma->vm_start) {ret = -EINVAL;goto out_unlock;}if (!dev->driver->gem_vm_ops) {ret = -EINVAL;goto out_unlock;}vma->vm_flags |= VM_RESERVED | VM_IO | VM_MIXEDMAP | VM_DONTEXPAND;vma->vm_ops = dev->driver->gem_vm_ops;vma->vm_private_data = exynos_gem_obj;vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));/* Take a ref for this mapping of the object, so that the fault* handler can dereference the mmap offset's pointer to the object.* This reference is cleaned up by the corresponding vm_close* (which should happen whether the vma was created by this call, or* by a vm_open due to mremap or partial unmap or whatever).*/vma->vm_ops->open(vma);+out_unlock:
return ret;+}
static struct dma_buf_ops exynos_dmabuf_ops = { .map_dma_buf = exynos_gem_map_dma_buf, .unmap_dma_buf = exynos_gem_unmap_dma_buf, @@ -172,6 +209,7 @@ static struct dma_buf_ops exynos_dmabuf_ops = { .kunmap = exynos_gem_dmabuf_kunmap, .kunmap_atomic = exynos_gem_dmabuf_kunmap_atomic, .release = exynos_dmabuf_release,
.mmap = exynos_gem_dmabuf_mmap,};
struct dma_buf *exynos_dmabuf_prime_export(struct drm_device *drm_dev,
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