Re: [RFC v2 7/8] drm/fence: add fence timeline to drm_crtc

[Ville Syrjälä]

On Mon, Apr 25, 2016 at 07:33:27PM -0300, Gustavo Padovan wrote:
> From: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx>
> 
> Create one timeline context for each CRTC to be able to handle out-fences
> and signal them. It adds a few members to struct drm_crtc: fence_context,
> where we store the context we get from fence_context_alloc(), the
> fence seqno and the fence lock, that we pass in fence_init() to be
> used by the fence.
> 
> Signed-off-by: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/drm_crtc.c | 29 +++++++++++++++++++++++++++++
>  include/drm/drm_crtc.h     | 19 +++++++++++++++++++
>  2 files changed, 48 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 65212ce..cf9750a 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -659,6 +659,32 @@ static unsigned int drm_num_crtcs(struct drm_device *dev)
>  	return num;
>  }
>  
> +static const char *drm_crtc_fence_get_driver_name(struct fence *fence)
> +{
> +	struct drm_crtc *crtc = fence_to_crtc(fence);
> +
> +	return crtc->dev->driver->name;
> +}
> +
> +static const char *drm_crtc_fence_get_timeline_name(struct fence *fence)
> +{
> +	struct drm_crtc *crtc = fence_to_crtc(fence);
> +
> +	return crtc->name;
> +}

Is that exported to userspace? crtc->name is an internal thing, not
meant for outside consumption.

> +
> +static bool drm_crtc_fence_enable_signaling(struct fence *fence)
> +{
> +	return true;
> +}
> +
> +const struct fence_ops drm_crtc_fence_ops = {
> +	.get_driver_name = drm_crtc_fence_get_driver_name,
> +	.get_timeline_name = drm_crtc_fence_get_timeline_name,
> +	.enable_signaling = drm_crtc_fence_enable_signaling,
> +	.wait = fence_default_wait,
> +};
> +
>  /**
>   * drm_crtc_init_with_planes - Initialise a new CRTC object with
>   *    specified primary and cursor planes.
> @@ -709,6 +735,9 @@ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
>  		return -ENOMEM;
>  	}
>  
> +	crtc->fence_context = fence_context_alloc(1);
> +	spin_lock_init(&crtc->fence_lock);
> +
>  	crtc->base.properties = &crtc->properties;
>  
>  	list_add_tail(&crtc->head, &config->crtc_list);
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 5ba3cda..d8c32c8 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -32,6 +32,7 @@
>  #include <linux/fb.h>
>  #include <linux/hdmi.h>
>  #include <linux/media-bus-format.h>
> +#include <linux/fence.h>
>  #include <uapi/drm/drm_mode.h>
>  #include <uapi/drm/drm_fourcc.h>
>  #include <drm/drm_modeset_lock.h>
> @@ -715,6 +716,9 @@ struct drm_crtc_funcs {
>   * @helper_private: mid-layer private data
>   * @properties: property tracking for this CRTC
>   * @state: current atomic state for this CRTC
> + * @fence_context: context for fence signalling
> + * @fence_lock: fence lock for the fence context
> + * @fence_seqno: seqno variable to create fences
>   * @acquire_ctx: per-CRTC implicit acquire context used by atomic drivers for
>   * 	legacy IOCTLs
>   *
> @@ -771,6 +775,11 @@ struct drm_crtc {
>  
>  	struct drm_crtc_state *state;
>  
> +	/* fence timelines info for DRM out-fences */
> +	unsigned int fence_context;
> +	spinlock_t fence_lock;
> +	unsigned long fence_seqno;
> +
>  	/*
>  	 * For legacy crtc IOCTLs so that atomic drivers can get at the locking
>  	 * acquire context.
> @@ -778,6 +787,16 @@ struct drm_crtc {
>  	struct drm_modeset_acquire_ctx *acquire_ctx;
>  };
>  
> +extern const struct fence_ops drm_crtc_fence_ops;
> +
> +static inline struct drm_crtc *fence_to_crtc(struct fence *fence)
> +{
> +	if (fence->ops != &drm_crtc_fence_ops)
> +		return NULL;
> +
> +	return container_of(fence->lock, struct drm_crtc, fence_lock);
> +}
> +
>  /**
>   * struct drm_connector_state - mutable connector state
>   * @connector: backpointer to the connector
> -- 
> 2.5.5
> 
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-- 
Ville Syrjälä
Intel OTC