Commit dd265850 authored Nov 19, 2012 by Prathyush K Committed by Inki Dae Dec 05, 2012

drm/exynos: add exynos drm specific fb_mmap function



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>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

parent 1daa892c

drivers/gpu/drm/exynos/exynos_drm_fbdev.c

+30 −0

Original line number	Diff line number	Diff line
		@@ -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;

		vm_size = vma->vm_end - vma->vm_start;

		if (vm_size > buffer->size)
		return -EINVAL;

		ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->kvaddr,
		buffer->dma_addr, buffer->size, &buffer->dma_attrs);
		if (ret < 0) {
		DRM_ERROR("failed to mmap.\n");
		return ret;
		}

		return 0;
		}

		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,