implement mmap function of dma_buf_ops.
Signed-off-by: Cooper Yuan <cooperyuan@xxxxxxxxx>
---
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)
+{
+ 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,
--
1.7.0.4
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