drm: call drm_gem_object_funcs.mmap with fake offset

The fake offset is going to stay, so change the calling convention for
drm_gem_object_funcs.mmap to include the fake offset.  Update all users
accordingly.

Note that this reverts 83b8a6f242ea ("drm/gem: Fix mmap fake offset
handling for drm_gem_object_funcs.mmap") and on top then adds the fake
offset to  drm_gem_prime_mmap to make sure all paths leading to
obj->funcs->mmap are consistent.

v3: move fake-offset tweak in drm_gem_prime_mmap() so we have this code
    only once in the function (Rob Herring).

Fixes: 83b8a6f242ea ("drm/gem: Fix mmap fake offset handling for drm_gem_object_funcs.mmap")
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20191127092523.5620-2-kraxel@redhat.com

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 2f2b889..56f42e0 100644 (file)
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -1106,9 +1106,6 @@ int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
                return -EINVAL;
 
        if (obj->funcs && obj->funcs->mmap) {
-               /* Remove the fake offset */
-               vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
-
                ret = obj->funcs->mmap(obj, vma);
                if (ret)
                        return ret;

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 0810d3e..a421a2e 100644 (file)
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -528,6 +528,9 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
        struct drm_gem_shmem_object *shmem;
        int ret;
 
+       /* Remove the fake offset */
+       vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
+
        shmem = to_drm_gem_shmem_obj(obj);
 
        ret = drm_gem_shmem_get_pages(shmem);

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 0814211..a0f929c 100644 (file)
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -713,6 +713,9 @@ int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
        struct file *fil;
        int ret;
 
+       /* Add the fake offset */
+       vma->vm_pgoff += drm_vma_node_start(&obj->vma_node);
+
        if (obj->funcs && obj->funcs->mmap) {
                ret = obj->funcs->mmap(obj, vma);
                if (ret)
@@ -737,8 +740,6 @@ int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
        if (ret)
                goto out;
 
-       vma->vm_pgoff += drm_vma_node_start(&obj->vma_node);
-
        ret = obj->dev->driver->fops->mmap(fil, vma);
 
        drm_vma_node_revoke(&obj->vma_node, priv);

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index e6495ca..3e8c3de 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -514,13 +514,6 @@ EXPORT_SYMBOL(ttm_bo_mmap);
 int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
 {
        ttm_bo_get(bo);
-
-       /*
-        * FIXME: &drm_gem_object_funcs.mmap is called with the fake offset
-        * removed. Add it back here until the rest of TTM works without it.
-        */
-       vma->vm_pgoff += drm_vma_node_start(&bo->base.vma_node);
-
        ttm_bo_mmap_vma_setup(bo, vma);
        return 0;
 }

diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index 97a4816..0b37506 100644 (file)
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -159,9 +159,7 @@ struct drm_gem_object_funcs {
         *
         * The callback is used by by both drm_gem_mmap_obj() and
         * drm_gem_prime_mmap().  When @mmap is present @vm_ops is not
-        * used, the @mmap callback must set vma->vm_ops instead. The @mmap
-        * callback is always called with a 0 offset. The caller will remove
-        * the fake offset as necessary.
+        * used, the @mmap callback must set vma->vm_ops instead.
         */
        int (*mmap)(struct drm_gem_object *obj, struct vm_area_struct *vma);