drm/msm: Split out helper to get iommu prot flags

We'll re-use this in the vm_bind path.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
Tested-by: Antonino Maniscalco <antomani103@gmail.com>
Reviewed-by: Antonino Maniscalco <antomani103@gmail.com>
Patchwork: https://patchwork.freedesktop.org/patch/661484/

Author: robclark

drivers/gpu/drm/msm/msm_gem.c

@@ -462,10 +462,9 @@ static struct drm_gpuva *get_vma_locked(struct drm_gem_object *obj,
 	return vma;
 }
 
-int msm_gem_pin_vma_locked(struct drm_gem_object *obj, struct drm_gpuva *vma)
+int msm_gem_prot(struct drm_gem_object *obj)
 {
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
-	struct page **pages;
 	int prot = IOMMU_READ;
 
 	if (!(msm_obj->flags & MSM_BO_GPU_READONLY))
@@ -477,6 +476,15 @@ int msm_gem_pin_vma_locked(struct drm_gem_object *obj, struct drm_gpuva *vma)
 	if (msm_obj->flags & MSM_BO_CACHED_COHERENT)
 		prot |= IOMMU_CACHE;
 
+	return prot;
+}
+
+int msm_gem_pin_vma_locked(struct drm_gem_object *obj, struct drm_gpuva *vma)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct page **pages;
+	int prot = msm_gem_prot(obj);
+
 	msm_gem_assert_locked(obj);
 
 	pages = msm_gem_get_pages_locked(obj, MSM_MADV_WILLNEED);

drivers/gpu/drm/msm/msm_gem.h

@@ -158,6 +158,7 @@ struct msm_gem_object {
 #define to_msm_bo(x) container_of(x, struct msm_gem_object, base)
 
 uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj);
+int msm_gem_prot(struct drm_gem_object *obj);
 int msm_gem_pin_vma_locked(struct drm_gem_object *obj, struct drm_gpuva *vma);
 void msm_gem_unpin_locked(struct drm_gem_object *obj);
 void msm_gem_unpin_active(struct drm_gem_object *obj);