Re: [PATCH v9 02/11] drm/panfrost: Don't sync rpm suspension after mmu flushing

From: Steven Price <steven.price@arm.com>
To: "Dmitry Osipenko" <dmitry.osipenko@collabora.com>,
	"David Airlie" <airlied@gmail.com>,
	"Gerd Hoffmann" <kraxel@redhat.com>,
	"Gurchetan Singh" <gurchetansingh@chromium.org>,
	"Chia-I Wu" <olvaffe@gmail.com>,
	"Daniel Vetter" <daniel@ffwll.ch>,
	"Daniel Almeida" <daniel.almeida@collabora.com>,
	"Gustavo Padovan" <gustavo.padovan@collabora.com>,
	"Daniel Stone" <daniel@fooishbar.org>,
	"Tomeu Vizoso" <tomeu.vizoso@collabora.com>,
	"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
	"Maxime Ripard" <mripard@kernel.org>,
	"Thomas Zimmermann" <tzimmermann@suse.de>,
	"Rob Clark" <robdclark@gmail.com>,
	"Sumit Semwal" <sumit.semwal@linaro.org>,
	"Christian König" <christian.koenig@amd.com>,
	"Qiang Yu" <yuq825@gmail.com>,
	"Alyssa Rosenzweig" <alyssa.rosenzweig@collabora.com>,
	"Rob Herring" <robh@kernel.org>, "Sean Paul" <sean@poorly.run>,
	"Dmitry Baryshkov" <dmitry.baryshkov@linaro.org>,
	"Abhinav Kumar" <quic_abhinavk@quicinc.com>
Cc: kernel@collabora.com, linux-kernel@vger.kernel.org,
	dri-devel@lists.freedesktop.org,
	virtualization@lists.linux-foundation.org
Subject: Re: [PATCH v9 02/11] drm/panfrost: Don't sync rpm suspension after mmu flushing
Date: Wed, 23 Nov 2022 15:59:28 +0000	[thread overview]
Message-ID: <2ddef062-2db4-974b-e856-58878b70856e@arm.com> (raw)
In-Reply-To: <20221123025723.695075-3-dmitry.osipenko@collabora.com>

On 23/11/2022 02:57, Dmitry Osipenko wrote:
> Lockdep warns about potential circular locking dependency of devfreq
> with the fs_reclaim caused by immediate device suspension when mapping is
> released by shrinker. Fix it by doing the suspension asynchronously.
> 
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>

Reviewed-by: Steven Price <steven.price@arm.com>

> ---
>  drivers/gpu/drm/panfrost/panfrost_mmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> index e246d914e7f6..99a0975f6f03 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> @@ -273,7 +273,7 @@ static void panfrost_mmu_flush_range(struct panfrost_device *pfdev,
>  	if (pm_runtime_active(pfdev->dev))
>  		mmu_hw_do_operation(pfdev, mmu, iova, size, AS_COMMAND_FLUSH_PT);
>  
> -	pm_runtime_put_sync_autosuspend(pfdev->dev);
> +	pm_runtime_put_autosuspend(pfdev->dev);
>  }
>  
>  static int mmu_map_sg(struct panfrost_device *pfdev, struct panfrost_mmu *mmu,