drm/ttm: Quick-test mmap offset in ttm_bo_mmap()

A BO's address has to be at least the minimum offset. Sharing this
test in ttm_bo_mmap() removes code from drivers. A full buffer-address
validation is still done within drm_vma_offset_lockup_locked().
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -1823,14 +1823,9 @@ void amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable)
 
 int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma)
 {
-	struct drm_file *file_priv;
-	struct amdgpu_device *adev;
-
-	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
-		return -EINVAL;
+	struct drm_file *file_priv = filp->private_data;
+	struct amdgpu_device *adev = file_priv->minor->dev->dev_private;
 
-	file_priv = filp->private_data;
-	adev = file_priv->minor->dev->dev_private;
 	if (adev == NULL)
 		return -EINVAL;
 

drivers/gpu/drm/ast/ast_ttm.c

@@ -343,13 +343,8 @@ int ast_bo_push_sysram(struct ast_bo *bo)
 
 int ast_mmap(struct file *filp, struct vm_area_struct *vma)
 {
-	struct drm_file *file_priv;
-	struct ast_private *ast;
+	struct drm_file *file_priv = filp->private_data;
+	struct ast_private *ast = file_priv->minor->dev->dev_private;
 
-	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
-		return -EINVAL;
-
-	file_priv = filp->private_data;
-	ast = file_priv->minor->dev->dev_private;
 	return ttm_bo_mmap(filp, vma, &ast->ttm.bdev);
 }

drivers/gpu/drm/bochs/bochs_mm.c

@@ -263,14 +263,9 @@ int bochs_bo_unpin(struct bochs_bo *bo)
 
 int bochs_mmap(struct file *filp, struct vm_area_struct *vma)
 {
-	struct drm_file *file_priv;
-	struct bochs_device *bochs;
+	struct drm_file *file_priv = filp->private_data;
+	struct bochs_device *bochs = file_priv->minor->dev->dev_private;
 
-	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
-		return -EINVAL;
-
-	file_priv = filp->private_data;
-	bochs = file_priv->minor->dev->dev_private;
 	return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
 }
 

drivers/gpu/drm/cirrus/cirrus_ttm.c

@@ -330,13 +330,8 @@ int cirrus_bo_push_sysram(struct cirrus_bo *bo)
 
 int cirrus_mmap(struct file *filp, struct vm_area_struct *vma)
 {
-	struct drm_file *file_priv;
-	struct cirrus_device *cirrus;
+	struct drm_file *file_priv = filp->private_data;
+	struct cirrus_device *cirrus = file_priv->minor->dev->dev_private;
 
-	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
-		return -EINVAL;
-
-	file_priv = filp->private_data;
-	cirrus = file_priv->minor->dev->dev_private;
 	return ttm_bo_mmap(filp, vma, &cirrus->ttm.bdev);
 }

drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c

@@ -319,14 +319,9 @@ int hibmc_bo_unpin(struct hibmc_bo *bo)
 
 int hibmc_mmap(struct file *filp, struct vm_area_struct *vma)
 {
-	struct drm_file *file_priv;
-	struct hibmc_drm_private *hibmc;
+	struct drm_file *file_priv = filp->private_data;
+	struct hibmc_drm_private *hibmc = file_priv->minor->dev->dev_private;
 
-	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
-		return -EINVAL;
-
-	file_priv = filp->private_data;
-	hibmc = file_priv->minor->dev->dev_private;
 	return ttm_bo_mmap(filp, vma, &hibmc->bdev);
 }
 

drivers/gpu/drm/mgag200/mgag200_ttm.c

@@ -344,13 +344,8 @@ int mgag200_bo_push_sysram(struct mgag200_bo *bo)
 
 int mgag200_mmap(struct file *filp, struct vm_area_struct *vma)
 {
-	struct drm_file *file_priv;
-	struct mga_device *mdev;
+	struct drm_file *file_priv = filp->private_data;
+	struct mga_device *mdev = file_priv->minor->dev->dev_private;
 
-	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
-		return -EINVAL;
-
-	file_priv = filp->private_data;
-	mdev = file_priv->minor->dev->dev_private;
 	return ttm_bo_mmap(filp, vma, &mdev->ttm.bdev);
 }

drivers/gpu/drm/nouveau/nouveau_ttm.c

@@ -168,9 +168,6 @@ nouveau_ttm_mmap(struct file *filp, struct vm_area_struct *vma)
 	struct drm_file *file_priv = filp->private_data;
 	struct nouveau_drm *drm = nouveau_drm(file_priv->minor->dev);
 
-	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
-		return drm_legacy_mmap(filp, vma);
-
 	return ttm_bo_mmap(filp, vma, &drm->ttm.bdev);
 }
 

drivers/gpu/drm/qxl/qxl_ttm.c

@@ -63,15 +63,10 @@ static vm_fault_t qxl_ttm_fault(struct vm_fault *vmf)
 
 int qxl_mmap(struct file *filp, struct vm_area_struct *vma)
 {
-	struct drm_file *file_priv;
-	struct qxl_device *qdev;
 	int r;
+	struct drm_file *file_priv = filp->private_data;
+	struct qxl_device *qdev = file_priv->minor->dev->dev_private;
 
-	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
-		return -EINVAL;
-
-	file_priv = filp->private_data;
-	qdev = file_priv->minor->dev->dev_private;
 	if (qdev == NULL) {
 		DRM_ERROR(
 		 "filp->private_data->minor->dev->dev_private == NULL\n");

drivers/gpu/drm/radeon/radeon_ttm.c

@@ -898,16 +898,10 @@ static vm_fault_t radeon_ttm_fault(struct vm_fault *vmf)
 
 int radeon_mmap(struct file *filp, struct vm_area_struct *vma)
 {
-	struct drm_file *file_priv;
-	struct radeon_device *rdev;
 	int r;
+	struct drm_file *file_priv = filp->private_data;
+	struct radeon_device *rdev = file_priv->minor->dev->dev_private;
 
-	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET)) {
-		return -EINVAL;
-	}
-
-	file_priv = filp->private_data;
-	rdev = file_priv->minor->dev->dev_private;
 	if (rdev == NULL) {
 		return -EINVAL;
 	}

drivers/gpu/drm/ttm/ttm_bo_vm.c

@@ -432,6 +432,9 @@ int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
 	struct ttm_buffer_object *bo;
 	int ret;
 
+	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
+		return -EINVAL;
+
 	bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
 	if (unlikely(!bo))
 		return -EINVAL;

drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c

@@ -30,16 +30,9 @@
 
 int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
 {
-	struct drm_file *file_priv;
-	struct vmw_private *dev_priv;
+	struct drm_file *file_priv = filp->private_data;
+	struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);
 
-	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET)) {
-		DRM_ERROR("Illegal attempt to mmap old fifo space.\n");
-		return -EINVAL;
-	}
-
-	file_priv = filp->private_data;
-	dev_priv = vmw_priv(file_priv->minor->dev);
 	return ttm_bo_mmap(filp, vma, &dev_priv->bdev);
 }
 

drivers/staging/vboxvideo/vbox_ttm.c

@@ -357,14 +357,8 @@ int vbox_bo_push_sysram(struct vbox_bo *bo)
 
 int vbox_mmap(struct file *filp, struct vm_area_struct *vma)
 {
-	struct drm_file *file_priv;
-	struct vbox_private *vbox;
-
-	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
-		return -EINVAL;
-
-	file_priv = filp->private_data;
-	vbox = file_priv->minor->dev->dev_private;
+	struct drm_file *file_priv = filp->private_data;
+	struct vbox_private *vbox = file_priv->minor->dev->dev_private;
 
 	return ttm_bo_mmap(filp, vma, &vbox->ttm.bdev);
 }