drm/msm: honor GPU_READONLY flag

Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 9cd6a96..9f51be5 100644 (file)
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -250,7 +250,8 @@ void msm_gem_purge_vma(struct msm_gem_address_space *aspace,
 void msm_gem_unmap_vma(struct msm_gem_address_space *aspace,
                struct msm_gem_vma *vma);
 int msm_gem_map_vma(struct msm_gem_address_space *aspace,
-               struct msm_gem_vma *vma, struct sg_table *sgt, int npages);
+               struct msm_gem_vma *vma, int prot,
+               struct sg_table *sgt, int npages);
 void msm_gem_close_vma(struct msm_gem_address_space *aspace,
                struct msm_gem_vma *vma);
 

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 51a95da..c8886d3 100644 (file)
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -391,6 +391,10 @@ static int msm_gem_pin_iova(struct drm_gem_object *obj,
        struct msm_gem_object *msm_obj = to_msm_bo(obj);
        struct msm_gem_vma *vma;
        struct page **pages;
+       int prot = IOMMU_READ;
+
+       if (!(msm_obj->flags & MSM_BO_GPU_READONLY))
+               prot |= IOMMU_WRITE;
 
        WARN_ON(!mutex_is_locked(&msm_obj->lock));
 
@@ -405,8 +409,8 @@ static int msm_gem_pin_iova(struct drm_gem_object *obj,
        if (IS_ERR(pages))
                return PTR_ERR(pages);
 
-       return msm_gem_map_vma(aspace, vma, msm_obj->sgt,
-                       obj->size >> PAGE_SHIFT);
+       return msm_gem_map_vma(aspace, vma, prot,
+                       msm_obj->sgt, obj->size >> PAGE_SHIFT);
 }
 
 /* get iova and pin it. Should have a matching put */

diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
index 5573607..49c0482 100644 (file)
--- a/drivers/gpu/drm/msm/msm_gem_vma.c
+++ b/drivers/gpu/drm/msm/msm_gem_vma.c
@@ -68,7 +68,8 @@ void msm_gem_unmap_vma(struct msm_gem_address_space *aspace,
 
 int
 msm_gem_map_vma(struct msm_gem_address_space *aspace,
-               struct msm_gem_vma *vma, struct sg_table *sgt, int npages)
+               struct msm_gem_vma *vma, int prot,
+               struct sg_table *sgt, int npages)
 {
        unsigned size = npages << PAGE_SHIFT;
        int ret = 0;
@@ -86,7 +87,7 @@ msm_gem_map_vma(struct msm_gem_address_space *aspace,
 
        if (aspace->mmu)
                ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt,
-                               size, IOMMU_READ | IOMMU_WRITE);
+                               size, prot);
 
        if (ret)
                vma->mapped = false;