lkml.org 
[lkml]   [2019]   [Dec]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v4 3/3] drm/udl: simplify gem object mapping.
On Wed, Dec 18, 2019 at 4:56 AM Gerd Hoffmann <kraxel@redhat.com> wrote:
>
> 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,
> };
It looks like we can just use the default ops (drm_gem_shmem_funcs).

With that, this series is

Reviewed-by: Chia-I Wu <olvaffe@gmail.com>.

>
> /*
> @@ -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
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

\
 
 \ /
  Last update: 2019-12-18 23:35    [W:0.026 / U:5.180 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site