On 11/19/12, Prathyush K <
prathyush.k@samsung.com> wrote:
> Changelog v3:
>
> Passing the actual buffer size instead of vm_size to dma_mmap_attrs.
>
> Changelog v2:
>
> Extracting the private data from fb_info structure to obtain the exynos
> gem buffer structure. Now, dma address is obtained from the exynos gem
> buffer structure and not from smem_start. Also calling dma_mmap_attrs
> (instead of dma_mmap_writecombine) with the same attributes used
> during allocation.
>
> Changelog v1:
>
> This patch adds a exynos drm specific implementation of fb_mmap
> which supports mapping a non-contiguous buffer to user space.
>
> This new function does not assume that the frame buffer is contiguous
> and calls dma_mmap_writecombine for mapping the buffer to user space.
> dma_mmap_writecombine will be able to map a contiguous buffer as well
> as non-contig buffer depending on whether an IOMMU mapping is created
> for drm or not.
>
> Signed-off-by: Prathyush K <
prathyush.k@samsung.com>
> ---
> drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 30
> +++++++++++++++++++++++++++++
> 1 files changed, 30 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> index 67eb6ba..a6f8cc2 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> @@ -46,8 +46,38 @@ struct exynos_drm_fbdev {
> struct exynos_drm_gem_obj *exynos_gem_obj;
> };
>
> +static int exynos_drm_fb_mmap(struct fb_info *info,
> + struct vm_area_struct *vma)
> +{
> + struct drm_fb_helper *helper = info->par;
> + struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
> + struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
> + struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
> + unsigned long vm_size;
> + int ret;
> +
> + DRM_DEBUG_KMS("%s\n", __func__);
> +
> + vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;