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Date: Mon, 5 Oct 2020 08:28:58 -0600
From: Jordan Crouse <jcrouse@...eaurora.org>
To: Rob Clark <robdclark@...il.com>
Cc: dri-devel@...ts.freedesktop.org,
Rob Clark <robdclark@...omium.org>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<freedreno@...ts.freedesktop.org>, David Airlie <airlied@...ux.ie>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<linux-arm-msm@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>,
Daniel Vetter <daniel@...ll.ch>, Sean Paul <sean@...rly.run>
Subject: Re: [Freedreno] [PATCH 08/14] drm/msm: Remove obj->gpu
On Sun, Oct 04, 2020 at 12:21:40PM -0700, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
>
> It cannot be atomically updated with obj->active_count, and the only
> purpose is a useless WARN_ON() (which becomes a buggy WARN_ON() once
> retire_submits() is not serialized with incoming submits via
> struct_mutex)
Somebody will prove me wrong but the longer we go without 2D the less likely it
is that we'll ever see it.
Reviewed-by: Jordan Crouse <jcrouse@...eaurora.org>
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
> drivers/gpu/drm/msm/msm_gem.c | 2 --
> drivers/gpu/drm/msm/msm_gem.h | 1 -
> drivers/gpu/drm/msm/msm_gpu.c | 5 -----
> 3 files changed, 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
> index b04ed8b52f9d..c52a3969e60b 100644
> --- a/drivers/gpu/drm/msm/msm_gem.c
> +++ b/drivers/gpu/drm/msm/msm_gem.c
> @@ -753,7 +753,6 @@ void msm_gem_active_get(struct drm_gem_object *obj, struct msm_gpu *gpu)
>
> if (!atomic_fetch_inc(&msm_obj->active_count)) {
> mutex_lock(&priv->mm_lock);
> - msm_obj->gpu = gpu;
> list_del_init(&msm_obj->mm_list);
> list_add_tail(&msm_obj->mm_list, &gpu->active_list);
> mutex_unlock(&priv->mm_lock);
> @@ -769,7 +768,6 @@ void msm_gem_active_put(struct drm_gem_object *obj)
>
> if (!atomic_dec_return(&msm_obj->active_count)) {
> mutex_lock(&priv->mm_lock);
> - msm_obj->gpu = NULL;
> list_del_init(&msm_obj->mm_list);
> list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
> mutex_unlock(&priv->mm_lock);
> diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
> index e05b1530aca6..61147bd96b06 100644
> --- a/drivers/gpu/drm/msm/msm_gem.h
> +++ b/drivers/gpu/drm/msm/msm_gem.h
> @@ -64,7 +64,6 @@ struct msm_gem_object {
> *
> */
> struct list_head mm_list;
> - struct msm_gpu *gpu; /* non-null if active */
>
> /* Transiently in the process of submit ioctl, objects associated
> * with the submit are on submit->bo_list.. this only lasts for
> diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
> index fd3fc6f36ab1..c9ff19a75169 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.c
> +++ b/drivers/gpu/drm/msm/msm_gpu.c
> @@ -800,11 +800,6 @@ void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit)
> struct drm_gem_object *drm_obj = &msm_obj->base;
> uint64_t iova;
>
> - /* can't happen yet.. but when we add 2d support we'll have
> - * to deal w/ cross-ring synchronization:
> - */
> - WARN_ON(is_active(msm_obj) && (msm_obj->gpu != gpu));
> -
> /* submit takes a reference to the bo and iova until retired: */
> drm_gem_object_get(&msm_obj->base);
> msm_gem_get_and_pin_iova(&msm_obj->base, submit->aspace, &iova);
> --
> 2.26.2
>
> _______________________________________________
> Freedreno mailing list
> Freedreno@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/freedreno
--
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