Re: [PATCH 1/5] drm/vblank: Switch drm_driver->get_vblank_timestamp to return a bool

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On Tue, May 09, 2017 at 04:03:25PM +0200, Daniel Vetter wrote:
> There's really no reason for anything more:
> - Calling this while the crtc vblank stuff isn't set up is a driver
>   bug. Those places alrready DRM_ERROR.
> - Calling this when the crtc is off is either a driver bug (calling
>   drm_crtc_handle_vblank at the wrong time) or a core bug (for
>   anything else). Again, we DRM_ERROR.
> - EINVAL is checked at higher levels already, and if we'd use struct
>   drm_crtc * instead of (dev, pipe) it would be real obvious that
>   those are again core bugs.
> 
> The only valid failure mode is crap hardware that couldn't sample a
> useful timestamp, to ask the core to just grab a not-so-accurate
> timestamp. Bool is perfectly fine for that.
> 
> v2: Also fix up the one caller, I lost that in the shuffling (Jani).
> 
> v3: Fixup commit message (Neil).
> 
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Mario Kleiner <mario.kleiner@xxxxxxxxxxxxxxxx>
> Cc: Eric Anholt <eric@xxxxxxxxxx>
> Cc: Rob Clark <robdclark@xxxxxxxxx>
> Cc: linux-arm-msm@xxxxxxxxxxxxxxx
> Cc: freedreno@xxxxxxxxxxxxxxxxxxxxx
> Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> Cc: Christian König <christian.koenig@xxxxxxx>
> Cc: Ben Skeggs <bskeggs@xxxxxxxxxx>
> Reviewed-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> Acked-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>

intel CI is still happy, so applied the entire series. Thanks a lot for
feedback and review.
-Daniel

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu.h       |  8 ++---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c   | 14 ++++-----
>  drivers/gpu/drm/drm_irq.c                 | 49 ++++++++++++-------------------
>  drivers/gpu/drm/i915/i915_irq.c           |  8 ++---
>  drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c   | 12 ++++----
>  drivers/gpu/drm/nouveau/nouveau_display.c |  4 +--
>  drivers/gpu/drm/nouveau/nouveau_display.h |  4 +--
>  drivers/gpu/drm/radeon/radeon_drv.c       |  8 ++---
>  drivers/gpu/drm/radeon/radeon_kms.c       | 14 ++++-----
>  drivers/gpu/drm/vc4/vc4_crtc.c            |  2 +-
>  drivers/gpu/drm/vc4/vc4_drv.h             |  2 +-
>  include/drm/drmP.h                        |  1 -
>  include/drm/drm_drv.h                     |  7 ++---
>  include/drm/drm_irq.h                     | 10 +++----
>  14 files changed, 64 insertions(+), 79 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 6a8129949333..7b4f808afff9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -1910,10 +1910,10 @@ int amdgpu_device_resume(struct drm_device *dev, bool resume, bool fbcon);
>  u32 amdgpu_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe);
>  int amdgpu_enable_vblank_kms(struct drm_device *dev, unsigned int pipe);
>  void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
> -int amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> -				    int *max_error,
> -				    struct timeval *vblank_time,
> -				    unsigned flags);
> +bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> +				     int *max_error,
> +				     struct timeval *vblank_time,
> +				     unsigned flags);
>  long amdgpu_kms_compat_ioctl(struct file *filp, unsigned int cmd,
>  			     unsigned long arg);
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> index 832be632478f..a1b97809305e 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> @@ -945,19 +945,19 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe)
>   *
>   * Gets the timestamp on the requested crtc based on the
>   * scanout position.  (all asics).
> - * Returns postive status flags on success, negative error on failure.
> + * Returns true on success, false on failure.
>   */
> -int amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> -				    int *max_error,
> -				    struct timeval *vblank_time,
> -				    unsigned flags)
> +bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> +				     int *max_error,
> +				     struct timeval *vblank_time,
> +				     unsigned flags)
>  {
>  	struct drm_crtc *crtc;
>  	struct amdgpu_device *adev = dev->dev_private;
>  
>  	if (pipe >= dev->num_crtcs) {
>  		DRM_ERROR("Invalid crtc %u\n", pipe);
> -		return -EINVAL;
> +		return false;
>  	}
>  
>  	/* Get associated drm_crtc: */
> @@ -966,7 +966,7 @@ int amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
>  		/* This can occur on driver load if some component fails to
>  		 * initialize completely and driver is unloaded */
>  		DRM_ERROR("Uninitialized crtc %d\n", pipe);
> -		return -EINVAL;
> +		return false;
>  	}
>  
>  	/* Helper routine in DRM core does all the work: */
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index 8c866cac62dd..677b37b0372b 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -724,43 +724,32 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
>   * active. Higher level code is expected to handle this.
>   *
>   * Returns:
> - * Negative value on error, failure or if not supported in current
> - * video mode:
> - *
> - * -EINVAL    Invalid CRTC.
> - * -EAGAIN    Temporary unavailable, e.g., called before initial modeset.
> - * -ENOTSUPP  Function not supported in current display mode.
> - * -EIO       Failed, e.g., due to failed scanout position query.
> - *
> - * Returns or'ed positive status flags on success:
> - *
> - * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.
> - * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.
>   *
> + * Returns true on success, and false on failure, i.e. when no accurate
> + * timestamp could be acquired.
>   */
> -int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> -					  unsigned int pipe,
> -					  int *max_error,
> -					  struct timeval *vblank_time,
> -					  unsigned flags,
> -					  const struct drm_display_mode *mode)
> +bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> +					   unsigned int pipe,
> +					   int *max_error,
> +					   struct timeval *vblank_time,
> +					   unsigned flags,
> +					   const struct drm_display_mode *mode)
>  {
>  	struct timeval tv_etime;
>  	ktime_t stime, etime;
>  	unsigned int vbl_status;
> -	int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD;
>  	int vpos, hpos, i;
>  	int delta_ns, duration_ns;
>  
>  	if (pipe >= dev->num_crtcs) {
>  		DRM_ERROR("Invalid crtc %u\n", pipe);
> -		return -EINVAL;
> +		return false;
>  	}
>  
>  	/* Scanout position query not supported? Should not happen. */
>  	if (!dev->driver->get_scanout_position) {
>  		DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
> -		return -EIO;
> +		return false;
>  	}
>  
>  	/* If mode timing undefined, just return as no-op:
> @@ -768,7 +757,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
>  	 */
>  	if (mode->crtc_clock == 0) {
>  		DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe);
> -		return -EAGAIN;
> +		return false;
>  	}
>  
>  	/* Get current scanout position with system timestamp.
> @@ -792,7 +781,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
>  		if (!(vbl_status & DRM_SCANOUTPOS_VALID)) {
>  			DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n",
>  				  pipe, vbl_status);
> -			return -EIO;
> +			return false;
>  		}
>  
>  		/* Compute uncertainty in timestamp of scanout position query. */
> @@ -836,7 +825,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
>  		      (long)vblank_time->tv_sec, (long)vblank_time->tv_usec,
>  		      duration_ns/1000, i);
>  
> -	return ret;
> +	return true;
>  }
>  EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
>  
> @@ -872,25 +861,23 @@ static bool
>  drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
>  			  struct timeval *tvblank, unsigned flags)
>  {
> -	int ret;
> +	bool ret = false;
>  
>  	/* Define requested maximum error on timestamps (nanoseconds). */
>  	int max_error = (int) drm_timestamp_precision * 1000;
>  
>  	/* Query driver if possible and precision timestamping enabled. */
> -	if (dev->driver->get_vblank_timestamp && (max_error > 0)) {
> +	if (dev->driver->get_vblank_timestamp && (max_error > 0))
>  		ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error,
>  							tvblank, flags);
> -		if (ret > 0)
> -			return true;
> -	}
>  
>  	/* GPU high precision timestamp query unsupported or failed.
>  	 * Return current monotonic/gettimeofday timestamp as best estimate.
>  	 */
> -	*tvblank = get_drm_timestamp();
> +	if (!ret)
> +		*tvblank = get_drm_timestamp();
>  
> -	return false;
> +	return ret;
>  }
>  
>  /**
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 7de152878d3e..34cb05a59742 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -964,7 +964,7 @@ int intel_get_crtc_scanline(struct intel_crtc *crtc)
>  	return position;
>  }
>  
> -static int i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
> +static bool i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
>  			      int *max_error,
>  			      struct timeval *vblank_time,
>  			      unsigned flags)
> @@ -974,19 +974,19 @@ static int i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
>  
>  	if (pipe >= INTEL_INFO(dev_priv)->num_pipes) {
>  		DRM_ERROR("Invalid crtc %u\n", pipe);
> -		return -EINVAL;
> +		return false;
>  	}
>  
>  	/* Get drm_crtc to timestamp: */
>  	crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
>  	if (crtc == NULL) {
>  		DRM_ERROR("Invalid crtc %u\n", pipe);
> -		return -EINVAL;
> +		return false;
>  	}
>  
>  	if (!crtc->base.hwmode.crtc_clock) {
>  		DRM_DEBUG_KMS("crtc %u is disabled\n", pipe);
> -		return -EBUSY;
> +		return false;
>  	}
>  
>  	/* Helper routine in DRM core does all the work: */
> diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
> index d3d6b4cae1e6..ffeb34bee3af 100644
> --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
> +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
> @@ -592,23 +592,23 @@ static int mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe,
>  	return ret;
>  }
>  
> -static int mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
> -				     int *max_error,
> -				     struct timeval *vblank_time,
> -				     unsigned flags)
> +static bool mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
> +				      int *max_error,
> +				      struct timeval *vblank_time,
> +				      unsigned flags)
>  {
>  	struct msm_drm_private *priv = dev->dev_private;
>  	struct drm_crtc *crtc;
>  
>  	if (pipe < 0 || pipe >= priv->num_crtcs) {
>  		DRM_ERROR("Invalid crtc %d\n", pipe);
> -		return -EINVAL;
> +		return false;
>  	}
>  
>  	crtc = priv->crtcs[pipe];
>  	if (!crtc) {
>  		DRM_ERROR("Invalid crtc %d\n", pipe);
> -		return -EINVAL;
> +		return false;
>  	}
>  
>  	return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
> index 21b10f9840c9..f1e36f70755d 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.c
> @@ -156,7 +156,7 @@ nouveau_display_scanoutpos(struct drm_device *dev, unsigned int pipe,
>  	return 0;
>  }
>  
> -int
> +bool
>  nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
>  			 int *max_error, struct timeval *time, unsigned flags)
>  {
> @@ -174,7 +174,7 @@ nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
>  		}
>  	}
>  
> -	return -EINVAL;
> +	return false;
>  }
>  
>  static void
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h
> index e1d772d39488..c6bfe533a641 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.h
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.h
> @@ -71,8 +71,8 @@ void nouveau_display_vblank_disable(struct drm_device *, unsigned int);
>  int  nouveau_display_scanoutpos(struct drm_device *, unsigned int,
>  				unsigned int, int *, int *, ktime_t *,
>  				ktime_t *, const struct drm_display_mode *);
> -int  nouveau_display_vblstamp(struct drm_device *, unsigned int, int *,
> -			      struct timeval *, unsigned);
> +bool  nouveau_display_vblstamp(struct drm_device *, unsigned int, int *,
> +			       struct timeval *, unsigned);
>  
>  int  nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
>  			    struct drm_pending_vblank_event *event,
> diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
> index 93d45aa5c3d4..caa0b1cc4269 100644
> --- a/drivers/gpu/drm/radeon/radeon_drv.c
> +++ b/drivers/gpu/drm/radeon/radeon_drv.c
> @@ -115,10 +115,10 @@ int radeon_resume_kms(struct drm_device *dev, bool resume, bool fbcon);
>  u32 radeon_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe);
>  int radeon_enable_vblank_kms(struct drm_device *dev, unsigned int pipe);
>  void radeon_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
> -int radeon_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> -				    int *max_error,
> -				    struct timeval *vblank_time,
> -				    unsigned flags);
> +bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> +				     int *max_error,
> +				     struct timeval *vblank_time,
> +				     unsigned flags);
>  void radeon_driver_irq_preinstall_kms(struct drm_device *dev);
>  int radeon_driver_irq_postinstall_kms(struct drm_device *dev);
>  void radeon_driver_irq_uninstall_kms(struct drm_device *dev);
> diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
> index e3e7cb1d10a2..535969d74f64 100644
> --- a/drivers/gpu/drm/radeon/radeon_kms.c
> +++ b/drivers/gpu/drm/radeon/radeon_kms.c
> @@ -869,25 +869,25 @@ void radeon_disable_vblank_kms(struct drm_device *dev, int crtc)
>   *
>   * Gets the timestamp on the requested crtc based on the
>   * scanout position.  (all asics).
> - * Returns postive status flags on success, negative error on failure.
> + * Returns true on success, false on failure.
>   */
> -int radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
> -				    int *max_error,
> -				    struct timeval *vblank_time,
> -				    unsigned flags)
> +bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
> +				     int *max_error,
> +				     struct timeval *vblank_time,
> +				     unsigned flags)
>  {
>  	struct drm_crtc *drmcrtc;
>  	struct radeon_device *rdev = dev->dev_private;
>  
>  	if (crtc < 0 || crtc >= dev->num_crtcs) {
>  		DRM_ERROR("Invalid crtc %d\n", crtc);
> -		return -EINVAL;
> +		return false;
>  	}
>  
>  	/* Get associated drm_crtc: */
>  	drmcrtc = &rdev->mode_info.crtcs[crtc]->base;
>  	if (!drmcrtc)
> -		return -EINVAL;
> +		return false;
>  
>  	/* Helper routine in DRM core does all the work: */
>  	return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc, max_error,
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index d86c8cce3182..f506525a1066 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -270,7 +270,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
>  	return ret;
>  }
>  
> -int vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
> +bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
>  				  int *max_error, struct timeval *vblank_time,
>  				  unsigned flags)
>  {
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
> index 92eb7d811bf2..d1c53a5d0923 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.h
> +++ b/drivers/gpu/drm/vc4/vc4_drv.h
> @@ -493,7 +493,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
>  			    unsigned int flags, int *vpos, int *hpos,
>  			    ktime_t *stime, ktime_t *etime,
>  			    const struct drm_display_mode *mode);
> -int vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
> +bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
>  				  int *max_error, struct timeval *vblank_time,
>  				  unsigned flags);
>  
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index e1daa4f343cd..a1b19bf45fb3 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -322,7 +322,6 @@ struct pci_controller;
>  
>  /* Flags and return codes for get_vblank_timestamp() driver function. */
>  #define DRM_CALLED_FROM_VBLIRQ 1
> -#define DRM_VBLANKTIME_SCANOUTPOS_METHOD (1 << 0)
>  
>  /* get_scanout_position() return flags */
>  #define DRM_SCANOUTPOS_VALID        (1 << 0)
> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
> index d0b5f363bfa1..da78e248d9d8 100644
> --- a/include/drm/drm_drv.h
> +++ b/include/drm/drm_drv.h
> @@ -316,11 +316,10 @@ struct drm_driver {
>  	 *
>  	 * Returns:
>  	 *
> -	 * Zero if timestamping isn't supported in current display mode or a
> -	 * negative number on failure. A positive status code on success,
> -	 * which describes how the vblank_time timestamp was computed.
> +	 * True on success, false on failure, which means the core should
> +	 * fallback to a simple timestamp taken in drm_crtc_handle_vblank().
>  	 */
> -	int (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
> +	bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
>  				     int *max_error,
>  				     struct timeval *vblank_time,
>  				     unsigned flags);
> diff --git a/include/drm/drm_irq.h b/include/drm/drm_irq.h
> index cf0be6594c8c..f0d5ccf9b282 100644
> --- a/include/drm/drm_irq.h
> +++ b/include/drm/drm_irq.h
> @@ -153,11 +153,11 @@ void drm_crtc_vblank_on(struct drm_crtc *crtc);
>  void drm_vblank_cleanup(struct drm_device *dev);
>  u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
>  
> -int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> -					  unsigned int pipe, int *max_error,
> -					  struct timeval *vblank_time,
> -					  unsigned flags,
> -					  const struct drm_display_mode *mode);
> +bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> +					   unsigned int pipe, int *max_error,
> +					   struct timeval *vblank_time,
> +					   unsigned flags,
> +					   const struct drm_display_mode *mode);
>  void drm_calc_timestamping_constants(struct drm_crtc *crtc,
>  				     const struct drm_display_mode *mode);
>  
> -- 
> 2.11.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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