This patch adds a exynos drm specific implementation of fb_mmap.
The root framebuffer is allocated using dma_alloc_attrs which can
allocate a contig or noncontig buffer depending on whether an iommu
is attached to drm device or not. The default fb_mmap function
always assumes the root fb to be contiguous thus failing in case of
a non-contig buffer.
The exynos drm specific implementation of fb_mmap extracts the private
data from the fb_info and calls dma_mmap_attrs with the parameters
used while allocating the buffer.
Signed-off-by: Prathyush K <prathyush.k@xxxxxxxxxxx>
---
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..62314ca 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;
+
+ 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, vm_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,
--
1.7.0.4
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
http://lists.freedesktop.org/mailman/listinfo/dri-devel
