Re: [PATCH 2/5] drm/i915: Move vblank evasion to commit (v3)

Ander Conselvan de Oliveira
2014-12-23T10:01:38Z

On 12/16/2014 02:23 AM, Matt Roper wrote:
> Move the vblank evasion up from the low-level, hw-specific
> update_plane() handlers to the general plane commit operation.
> Everything inside commit should now be non-sleeping, so this brings us
> closer to how vblank evasion will behave once we move over to atomic.
>
> v2:
> - Restore lost intel_crtc->active check on vblank evasion
>
> v3:
> - Replace assert_pipe_enabled() in intel_disable_primary_hw_plane()
> with an intel_crtc->active test; it turns out assert_pipe_enabled()
> grabs some mutexes and can sleep, which we can't do with interrupts
> disabled.

Sounds like this should have gone in the previous patch, or a separate one.

Ander

>
> Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
> ---
> drivers/gpu/drm/i915/intel_display.c | 13 ++++++++++-
> drivers/gpu/drm/i915/intel_drv.h | 4 ++++
> drivers/gpu/drm/i915/intel_sprite.c | 42 ------------------------------------
> 3 files changed, 16 insertions(+), 43 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 5d90114..ce552d1 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2165,7 +2165,8 @@ static void intel_disable_primary_hw_plane(struct drm_plane *plane,
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
>
> - assert_pipe_enabled(dev_priv, intel_crtc->pipe);
> + if (WARN_ON(!intel_crtc->active))
> + return;
>
> if (!intel_crtc->primary_enabled)
> return;
> @@ -11861,6 +11862,12 @@ static void intel_begin_crtc_commit(struct drm_crtc *crtc)
>
> if (intel_crtc->atomic.update_wm)
> intel_update_watermarks(crtc);
> +
> + /* Perform vblank evasion around commit operation */
> + if (intel_crtc->active)
> + intel_crtc->atomic.evade =
> + intel_pipe_update_start(intel_crtc,
> + &intel_crtc->atomic.start_vbl_count);
> }
>
> static void intel_finish_crtc_commit(struct drm_crtc *crtc)
> @@ -11869,6 +11876,10 @@ static void intel_finish_crtc_commit(struct drm_crtc *crtc)
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> struct drm_plane *p;
>
> + if (intel_crtc->atomic.evade)
> + intel_pipe_update_end(intel_crtc,
> + intel_crtc->atomic.start_vbl_count);
> +
> if (intel_crtc->atomic.wait_vblank)
> intel_wait_for_vblank(dev, intel_crtc->pipe);
>
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index a03bd72..1934156 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -428,6 +428,10 @@ struct skl_pipe_wm {
> * and thus can't be run with interrupts disabled.
> */
> struct intel_crtc_atomic_commit {
> + /* vblank evasion */
> + bool evade;
> + unsigned start_vbl_count;
> +
> /* Sleepable operations to perform before commit */
> bool wait_for_flips;
> bool disable_fbc;
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> index ff7d6a1..2520748 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -412,8 +412,6 @@ vlv_update_plane(struct drm_plane *dplane, struct drm_crtc *crtc,
> u32 sprctl;
> unsigned long sprsurf_offset, linear_offset;
> int pixel_size = drm_format_plane_cpp(fb->pixel_format, 0);
> - u32 start_vbl_count;
> - bool atomic_update;
>
> sprctl = I915_READ(SPCNTR(pipe, plane));
>
> @@ -502,8 +500,6 @@ vlv_update_plane(struct drm_plane *dplane, struct drm_crtc *crtc,
> linear_offset += src_h * fb->pitches[0] + src_w * pixel_size;
> }
>
> - atomic_update = intel_pipe_update_start(intel_crtc, &start_vbl_count);
> -
> intel_update_primary_plane(intel_crtc);
>
> if (IS_CHERRYVIEW(dev) && pipe == PIPE_B)
> @@ -525,9 +521,6 @@ vlv_update_plane(struct drm_plane *dplane, struct drm_crtc *crtc,
> sprsurf_offset);
>
> intel_flush_primary_plane(dev_priv, intel_crtc->plane);
> -
> - if (atomic_update)
> - intel_pipe_update_end(intel_crtc, start_vbl_count);
> }
>
> static void
> @@ -539,10 +532,6 @@ vlv_disable_plane(struct drm_plane *dplane, struct drm_crtc *crtc)
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> int pipe = intel_plane->pipe;
> int plane = intel_plane->plane;
> - u32 start_vbl_count;
> - bool atomic_update;
> -
> - atomic_update = intel_pipe_update_start(intel_crtc, &start_vbl_count);
>
> intel_update_primary_plane(intel_crtc);
>
> @@ -553,9 +542,6 @@ vlv_disable_plane(struct drm_plane *dplane, struct drm_crtc *crtc)
>
> intel_flush_primary_plane(dev_priv, intel_crtc->plane);
>
> - if (atomic_update)
> - intel_pipe_update_end(intel_crtc, start_vbl_count);
> -
> intel_update_sprite_watermarks(dplane, crtc, 0, 0, 0, false, false);
> }
>
> @@ -626,8 +612,6 @@ ivb_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
> u32 sprctl, sprscale = 0;
> unsigned long sprsurf_offset, linear_offset;
> int pixel_size = drm_format_plane_cpp(fb->pixel_format, 0);
> - u32 start_vbl_count;
> - bool atomic_update;
>
> sprctl = I915_READ(SPRCTL(pipe));
>
> @@ -711,8 +695,6 @@ ivb_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
> }
> }
>
> - atomic_update = intel_pipe_update_start(intel_crtc, &start_vbl_count);
> -
> intel_update_primary_plane(intel_crtc);
>
> I915_WRITE(SPRSTRIDE(pipe), fb->pitches[0]);
> @@ -735,9 +717,6 @@ ivb_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
> i915_gem_obj_ggtt_offset(obj) + sprsurf_offset);
>
> intel_flush_primary_plane(dev_priv, intel_crtc->plane);
> -
> - if (atomic_update)
> - intel_pipe_update_end(intel_crtc, start_vbl_count);
> }
>
> static void
> @@ -748,10 +727,6 @@ ivb_disable_plane(struct drm_plane *plane, struct drm_crtc *crtc)
> struct intel_plane *intel_plane = to_intel_plane(plane);
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> int pipe = intel_plane->pipe;
> - u32 start_vbl_count;
> - bool atomic_update;
> -
> - atomic_update = intel_pipe_update_start(intel_crtc, &start_vbl_count);
>
> intel_update_primary_plane(intel_crtc);
>
> @@ -764,9 +739,6 @@ ivb_disable_plane(struct drm_plane *plane, struct drm_crtc *crtc)
>
> intel_flush_primary_plane(dev_priv, intel_crtc->plane);
>
> - if (atomic_update)
> - intel_pipe_update_end(intel_crtc, start_vbl_count);
> -
> /*
> * Avoid underruns when disabling the sprite.
> * FIXME remove once watermark updates are done properly.
> @@ -845,8 +817,6 @@ ilk_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
> unsigned long dvssurf_offset, linear_offset;
> u32 dvscntr, dvsscale;
> int pixel_size = drm_format_plane_cpp(fb->pixel_format, 0);
> - u32 start_vbl_count;
> - bool atomic_update;
>
> dvscntr = I915_READ(DVSCNTR(pipe));
>
> @@ -921,8 +891,6 @@ ilk_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
> linear_offset += src_h * fb->pitches[0] + src_w * pixel_size;
> }
>
> - atomic_update = intel_pipe_update_start(intel_crtc, &start_vbl_count);
> -
> intel_update_primary_plane(intel_crtc);
>
> I915_WRITE(DVSSTRIDE(pipe), fb->pitches[0]);
> @@ -940,9 +908,6 @@ ilk_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
> i915_gem_obj_ggtt_offset(obj) + dvssurf_offset);
>
> intel_flush_primary_plane(dev_priv, intel_crtc->plane);
> -
> - if (atomic_update)
> - intel_pipe_update_end(intel_crtc, start_vbl_count);
> }
>
> static void
> @@ -953,10 +918,6 @@ ilk_disable_plane(struct drm_plane *plane, struct drm_crtc *crtc)
> struct intel_plane *intel_plane = to_intel_plane(plane);
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> int pipe = intel_plane->pipe;
> - u32 start_vbl_count;
> - bool atomic_update;
> -
> - atomic_update = intel_pipe_update_start(intel_crtc, &start_vbl_count);
>
> intel_update_primary_plane(intel_crtc);
>
> @@ -968,9 +929,6 @@ ilk_disable_plane(struct drm_plane *plane, struct drm_crtc *crtc)
>
> intel_flush_primary_plane(dev_priv, intel_crtc->plane);
>
> - if (atomic_update)
> - intel_pipe_update_end(intel_crtc, start_vbl_count);
> -
> /*
> * Avoid underruns when disabling the sprite.
> * FIXME remove once watermark updates are done properly.
>