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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>
This commit is contained in:
Prathyush K 2012-11-19 13:55:28 +05:30 committed by Inki Dae
parent 1daa892c1d
commit dd265850f1
1 changed files with 30 additions and 0 deletions
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30
drivers/gpu/drm/exynos/exynos_drm_fbdev.c
View File

@ -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,