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Message-ID: <2c3b55f9-7b18-4083-1b61-ad0ce6a13660@redhat.com>
Date: Thu, 21 Jul 2022 12:38:39 +0200
From: Danilo Krummrich <dakr@...hat.com>
To: Sam Ravnborg <sam@...nborg.org>
Cc: airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
kraxel@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 1/2] drm/virtio: plane: use drm managed resources
Hi Sam,
On 7/20/22 17:17, Sam Ravnborg wrote:
> Hi Danilo,
>
> thanks for submitting this patch.
>
> On Wed, Jul 20, 2022 at 04:02:13PM +0200, Danilo Krummrich wrote:
>> Use drm managed resource allocation (drmm_universal_plane_alloc()) in
>> order to cleanup/simplify drm plane .destroy callback.
>>
>> Signed-off-by: Danilo Krummrich <dakr@...hat.com>
>> ---
>> drivers/gpu/drm/virtio/virtgpu_plane.c | 30 +++++++-------------------
>> 1 file changed, 8 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
>> index 6d3cc9e238a4..3008551d6a05 100644
>> --- a/drivers/gpu/drm/virtio/virtgpu_plane.c
>> +++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
>> @@ -67,16 +67,10 @@ uint32_t virtio_gpu_translate_format(uint32_t drm_fourcc)
>> return format;
>> }
>>
>> -static void virtio_gpu_plane_destroy(struct drm_plane *plane)
>> -{
>> - drm_plane_cleanup(plane);
>> - kfree(plane);
>> -}
>> -
>> static const struct drm_plane_funcs virtio_gpu_plane_funcs = {
>> .update_plane = drm_atomic_helper_update_plane,
>> .disable_plane = drm_atomic_helper_disable_plane,
>> - .destroy = virtio_gpu_plane_destroy,
>> + .destroy = drm_plane_cleanup,
>
> From the documentation of drmm_universal_plane_alloc:
>
> The @drm_plane_funcs.destroy hook must be NULL.
>
> So the above assignment looks wrong.
Good catch! Indeed it registers the drm_plane_cleanup() with
drmm_add_action_or_reset() already.
I'll send a v2.
>
> The rest of this patch looks OK.
>
> Sam
Danilo
>
>
>> .reset = drm_atomic_helper_plane_reset,
>> .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
>> .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
>> @@ -379,11 +373,7 @@ struct drm_plane *virtio_gpu_plane_init(struct virtio_gpu_device *vgdev,
>> const struct drm_plane_helper_funcs *funcs;
>> struct drm_plane *plane;
>> const uint32_t *formats;
>> - int ret, nformats;
>> -
>> - plane = kzalloc(sizeof(*plane), GFP_KERNEL);
>> - if (!plane)
>> - return ERR_PTR(-ENOMEM);
>> + int nformats;
>>
>> if (type == DRM_PLANE_TYPE_CURSOR) {
>> formats = virtio_gpu_cursor_formats;
>> @@ -394,17 +384,13 @@ struct drm_plane *virtio_gpu_plane_init(struct virtio_gpu_device *vgdev,
>> nformats = ARRAY_SIZE(virtio_gpu_formats);
>> funcs = &virtio_gpu_primary_helper_funcs;
>> }
>> - ret = drm_universal_plane_init(dev, plane, 1 << index,
>> - &virtio_gpu_plane_funcs,
>> - formats, nformats,
>> - NULL, type, NULL);
>> - if (ret)
>> - goto err_plane_init;
>> +
>> + plane = drmm_universal_plane_alloc(dev, struct drm_plane, dev,
>> + 1 << index, &virtio_gpu_plane_funcs,
>> + formats, nformats, NULL, type, NULL);
>> + if (IS_ERR(plane))
>> + return plane;
>>
>> drm_plane_helper_add(plane, funcs);
>> return plane;
>> -
>> -err_plane_init:
>> - kfree(plane);
>> - return ERR_PTR(ret);
>> }
>> --
>> 2.36.1
>
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