> -----Original Message-----
> From: Prathyush K [mailto:prathyus...@samsung.com]
> Sent: Wednesday, July 11, 2012 6:40 PM
> To: dri-devel@lists.freedesktop.org
> Cc: prathy...@chromium.org; m.szyprow...@samsung.com;
inki....@samsung.com;
> subash.ramasw...@linaro.org
> Subject: [PATCH 6/7] drm/exynos: Add exynos drm specific fb_mmap function
>
> 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 <prathyus...@samsung.com>
> ---
> drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 16 ++++++++++++++++
> 1 files changed, 16 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> index d5586cc..b53e638 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> @@ -46,8 +46,24 @@ 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)
> +{
> + if ((vma->vm_end - vma->vm_start) > info->fix.smem_len)
> + return -EINVAL;
> +
> + vma->vm_pgoff = 0;
> + vma->vm_flags |= VM_IO | VM_RESERVED;
> + if (dma_mmap_writecombine(info->device, vma, info->screen_base,
> + info->fix.smem_start, vma->vm_end - vma->vm_start))
> + return -EAGAIN;
> +
> + return 0;
> +}
> +
Ok, it's good feature. actually the physically non-contiguous gem buffer
allocated for console framebuffer has to be mapped with user space.
Thanks.
> static struct fb_ops exynos_drm_fb_ops = {
> .owner = THIS_MODULE,
> + .fb_mmap = exynos_drm_fb_mmap,
> .fb_fillrect = cfb_fillrect,
> .fb_copyarea = cfb_copyarea,
> .fb_imageblit = cfb_imageblit,
> --
> 1.7.0.4
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