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Subject[PATCH v4 3/3] drm/udl: simplify gem object mapping.
Date
With shmem helpers allowing to update pgprot caching flags via
drm_gem_shmem_object.map_cached we can just use that and ditch
our own implementations of mmap() and vmap().

We also don't need a special case for imported objects, any map
requests are handled by the exporter not udl.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
drivers/gpu/drm/udl/udl_gem.c | 62 ++---------------------------------
1 file changed, 3 insertions(+), 59 deletions(-)

diff --git a/drivers/gpu/drm/udl/udl_gem.c b/drivers/gpu/drm/udl/udl_gem.c
index b6e26f98aa0a..7e3a88b25b6b 100644
--- a/drivers/gpu/drm/udl/udl_gem.c
+++ b/drivers/gpu/drm/udl/udl_gem.c
@@ -17,72 +17,15 @@
* GEM object funcs
*/

-static int udl_gem_object_mmap(struct drm_gem_object *obj,
- struct vm_area_struct *vma)
-{
- int ret;
-
- ret = drm_gem_shmem_mmap(obj, vma);
- if (ret)
- return ret;
-
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
- if (obj->import_attach)
- vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
- vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
-
- return 0;
-}
-
-static void *udl_gem_object_vmap(struct drm_gem_object *obj)
-{
- struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
- int ret;
-
- ret = mutex_lock_interruptible(&shmem->vmap_lock);
- if (ret)
- return ERR_PTR(ret);
-
- if (shmem->vmap_use_count++ > 0)
- goto out;
-
- ret = drm_gem_shmem_get_pages(shmem);
- if (ret)
- goto err_zero_use;
-
- if (obj->import_attach)
- shmem->vaddr = dma_buf_vmap(obj->import_attach->dmabuf);
- else
- shmem->vaddr = vmap(shmem->pages, obj->size >> PAGE_SHIFT,
- VM_MAP, PAGE_KERNEL);
-
- if (!shmem->vaddr) {
- DRM_DEBUG_KMS("Failed to vmap pages\n");
- ret = -ENOMEM;
- goto err_put_pages;
- }
-
-out:
- mutex_unlock(&shmem->vmap_lock);
- return shmem->vaddr;
-
-err_put_pages:
- drm_gem_shmem_put_pages(shmem);
-err_zero_use:
- shmem->vmap_use_count = 0;
- mutex_unlock(&shmem->vmap_lock);
- return ERR_PTR(ret);
-}
-
static const struct drm_gem_object_funcs udl_gem_object_funcs = {
.free = drm_gem_shmem_free_object,
.print_info = drm_gem_shmem_print_info,
.pin = drm_gem_shmem_pin,
.unpin = drm_gem_shmem_unpin,
.get_sg_table = drm_gem_shmem_get_sg_table,
- .vmap = udl_gem_object_vmap,
+ .vmap = drm_gem_shmem_vmap,
.vunmap = drm_gem_shmem_vunmap,
- .mmap = udl_gem_object_mmap,
+ .mmap = drm_gem_shmem_mmap,
};

/*
@@ -101,6 +44,7 @@ struct drm_gem_object *udl_driver_gem_create_object(struct drm_device *dev,

obj = &shmem->base;
obj->funcs = &udl_gem_object_funcs;
+ shmem->map_cached = true;

return obj;
}
--
2.18.1
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