linux-kernel - Re: [PATCH 1/3] drm/crtc: Introduce per-crtc kworker

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Date:   Mon, 21 Sep 2020 12:20:46 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-arm-msm@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>, timmurray@...gle.com,
        David Airlie <airlied@...ux.ie>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 1/3] drm/crtc: Introduce per-crtc kworker

On Sat, 19 Sep 2020, Rob Clark <robdclark@...il.com> wrote:
> From: Rob Clark <robdclark@...omium.org>
>
> This will be used for non-block atomic commits.
>
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>  drivers/gpu/drm/drm_crtc.c | 11 +++++++++++
>  include/drm/drm_crtc.h     |  8 ++++++++
>  2 files changed, 19 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index aecdd7ea26dc..4f7c0bfce0a3 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -326,6 +326,14 @@ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
>  					   config->prop_out_fence_ptr, 0);
>  		drm_object_attach_property(&crtc->base,
>  					   config->prop_vrr_enabled, 0);
> +
> +		crtc->worker = kthread_create_worker(0, "%s-worker", crtc->name);
> +		if (IS_ERR(crtc->worker)) {
> +			drm_mode_object_unregister(dev, &crtc->base);
> +			ret = PTR_ERR(crtc->worker);
> +			crtc->worker = NULL;
> +			return ret;
> +		}
>  	}
>  
>  	return 0;
> @@ -366,6 +374,9 @@ void drm_crtc_cleanup(struct drm_crtc *crtc)
>  
>  	kfree(crtc->name);
>  
> +	if (crtc->worker)
> +		kthread_destroy_worker(crtc->worker);
> +
>  	memset(crtc, 0, sizeof(*crtc));
>  }
>  EXPORT_SYMBOL(drm_crtc_cleanup);
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 59b51a09cae6..8964a3732bca 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -30,6 +30,7 @@
>  #include <linux/types.h>
>  #include <linux/fb.h>
>  #include <linux/hdmi.h>
> +#include <linux/kthread.h>

A forward declaration would suffice.

>  #include <linux/media-bus-format.h>
>  #include <uapi/drm/drm_mode.h>
>  #include <uapi/drm/drm_fourcc.h>
> @@ -1172,6 +1173,13 @@ struct drm_crtc {
>  	 * Initialized via drm_self_refresh_helper_init().
>  	 */
>  	struct drm_self_refresh_data *self_refresh_data;
> +
> +	/**
> +	 * worker:

Missing @, should be "@worker:".

> +	 *
> +	 * Per-CRTC worker for nonblock atomic commits.
> +	 */
> +	struct kthread_worker *worker;
>  };
>  
>  /**

-- 
Jani Nikula, Intel Open Source Graphics Center