1 files changed, 65 insertions, 9 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
index e7466c4414cb..f433eb7533a9 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->pages,
+		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,
@@ -79,6 +109,17 @@ static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
 		return -EFAULT;
 	}
 
+	/* map pages with kernel virtual space. */
+	if (!buffer->kvaddr) {
+		unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
+		buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP,
+					pgprot_writecombine(PAGE_KERNEL));
+		if (!buffer->kvaddr) {
+			DRM_ERROR("failed to map pages to kernel space.\n");
+			return -EIO;
+		}
+	}
+
 	/* buffer count to framebuffer always is 1 at booting time. */
 	exynos_drm_fb_set_buf_cnt(fb, 1);
 
@@ -87,8 +128,8 @@ static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
 
 	dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
 	fbi->screen_base = buffer->kvaddr + offset;
-	fbi->fix.smem_start = (unsigned long)(page_to_phys(buffer->pages[0]) +
-				offset);
+	fbi->fix.smem_start = (unsigned long)
+			(page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
 	fbi->screen_size = size;
 	fbi->fix.smem_len = size;
 
@@ -134,7 +175,7 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 	exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
 	if (IS_ERR(exynos_gem_obj)) {
 		ret = PTR_ERR(exynos_gem_obj);
-		goto out;
+		goto err_release_framebuffer;
 	}
 
 	exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
@@ -144,7 +185,7 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 	if (IS_ERR_OR_NULL(helper->fb)) {
 		DRM_ERROR("failed to create drm framebuffer.\n");
 		ret = PTR_ERR(helper->fb);
-		goto out;
+		goto err_destroy_gem;
 	}
 
 	helper->fbdev = fbi;
@@ -156,14 +197,24 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 	if (ret) {
 		DRM_ERROR("failed to allocate cmap.\n");
-		goto out;
+		goto err_destroy_framebuffer;
 	}
 
 	ret = exynos_drm_fbdev_update(helper, helper->fb);
-	if (ret < 0) {
-		fb_dealloc_cmap(&fbi->cmap);
-		goto out;
-	}
+	if (ret < 0)
+		goto err_dealloc_cmap;
+
+	mutex_unlock(&dev->struct_mutex);
+	return ret;
+
+err_dealloc_cmap:
+	fb_dealloc_cmap(&fbi->cmap);
+err_destroy_framebuffer:
+	drm_framebuffer_cleanup(helper->fb);
+err_destroy_gem:
+	exynos_drm_gem_destroy(exynos_gem_obj);
+err_release_framebuffer:
+	framebuffer_release(fbi);
 
 /*
  * if failed, all resources allocated above would be released by
@@ -265,8 +316,13 @@ err_init:
 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 				      struct drm_fb_helper *fb_helper)
 {
+	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
+	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
 	struct drm_framebuffer *fb;
 
+	if (exynos_gem_obj->buffer->kvaddr)
+		vunmap(exynos_gem_obj->buffer->kvaddr);
+
 	/* release drm framebuffer and real buffer */
 	if (fb_helper->fb && fb_helper->fb->funcs) {
 		fb = fb_helper->fb;