linux-kernel - Re: [PATCH v11 2/3] drm/fence: add fence timeline to drm

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Message-ID: <20161115084235.GA20601@joana>
Date:   Tue, 15 Nov 2016 17:42:35 +0900
From:   Gustavo Padovan <gustavo@...ovan.org>
To:     Chris Wilson <chris@...is-wilson.co.uk>,
        dri-devel@...ts.freedesktop.org, marcheu@...gle.com,
        Daniel Stone <daniels@...labora.com>, seanpaul@...gle.com,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        linux-kernel@...r.kernel.org, laurent.pinchart@...asonboard.com,
        Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
        John Harrison <John.C.Harrison@...el.com>, m.chehab@...sung.com
Subject: Re: [PATCH v11 2/3] drm/fence: add fence timeline to drm_crtc

2016-11-15 Chris Wilson <chris@...is-wilson.co.uk>:

> On Tue, Nov 15, 2016 at 10:57:35AM +0900, Gustavo Padovan wrote:
> > diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> > index 11780a9..0870de1 100644
> > --- a/include/drm/drm_crtc.h
> > +++ b/include/drm/drm_crtc.h
> > @@ -32,6 +32,8 @@
> >  #include <linux/fb.h>
> >  #include <linux/hdmi.h>
> >  #include <linux/media-bus-format.h>
> > +#include <linux/srcu.h>
> > +#include <linux/dma-fence.h>
> >  #include <uapi/drm/drm_mode.h>
> >  #include <uapi/drm/drm_fourcc.h>
> >  #include <drm/drm_modeset_lock.h>
> > @@ -739,9 +741,52 @@ struct drm_crtc {
> >  	 */
> >  	struct drm_crtc_crc crc;
> >  #endif
> > +
> > +	/**
> > +	 * @fence_context:
> > +	 *
> > +	 * timeline context used for fence operations.
> > +	 */
> > +	unsigned int fence_context;
> > +
> > +	/**
> > +	 * @fence_lock:
> > +	 *
> > +	 * spinlock to protect the fences in the fence_context.
> > +	 */
> > +
> > +	spinlock_t fence_lock;
> > +	/**
> > +	 * @fence_seqno:
> > +	 *
> > +	 * Seqno variable used as monotonic counter for the fences
> > +	 * created on the CRTC's timeline.
> > +	 */
> > +	unsigned long fence_seqno;
> > +
> > +	/**
> > +	 * @timeline_name:
> > +	 *
> > +	 * The name of the CRTC's fence timeline.
> > +	 */
> > +	char timeline_name[32];
> >  };
> >  
> >  /**
> > + * dma_crtc_fence_ops - fence ops for the drm_crtc timeline
> > + *
> > + * It contains the dma_fence_ops that should be called by the dma_fence
> > + * code. CRTC core should use this ops when initializing fences.
> > + */
> > +extern const struct dma_fence_ops drm_crtc_fence_ops;
> > +
> > +static inline struct drm_crtc *fence_to_crtc(struct dma_fence *fence)
> > +{
> > +	BUG_ON(fence->ops != &drm_crtc_fence_ops);
> > +	return container_of(fence->lock, struct drm_crtc, fence_lock);
> > +}
> 
> If you are planning to export this for use by drivers, you are missing
> the EXPORT_SYMBOL(drm_crtc_fence_ops).

Drivers should not be using this, at least for now.

Gustavo