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Date: Thu, 13 Oct 2016 18:20:04 -0300
From: Paulo Zanoni <paulo.r.zanoni@...el.com>
To: Lyude <cpaul@...hat.com>, intel-gfx@...ts.freedesktop.org
Cc: David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org,
Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [Intel-gfx] [PATCH 09/10] drm/i915/gen9: Actually verify WM
levels in verify_wm_state()
Em Qui, 2016-10-13 às 18:15 -0300, Paulo Zanoni escreveu:
> Em Sex, 2016-10-07 às 20:11 -0400, Lyude escreveu:
> >
> > Thanks to Paulo Zanoni for indirectly pointing this out.
> >
> > Looks like we never actually added any code for checking whether or
> > not
> > we actually wrote watermark levels properly. Let's fix that.
>
> Thanks for doing this!
>
> Reviewed-by: Paulo Zanoni <paulo.r.zanoni@...el.com>
>
> A check that would have prevented one of the bugs I solved would be
> "if
> plane is active, then level 0 must be enabled, and DDB partitioning
> size must be non-zero". I'll put this in my TODO list, but I won't
> complain if somebody does it first :)
Also, bikeshed: use %u instead of %d for the unsigned types
(plane_res_b, plane_res_l).
>
> >
> >
> > Signed-off-by: Lyude <cpaul@...hat.com>
> > Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> > Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> > Cc: Paulo Zanoni <paulo.r.zanoni@...el.com>
> > ---
> > drivers/gpu/drm/i915/intel_display.c | 100
> > +++++++++++++++++++++++++++++------
> > 1 file changed, 84 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_display.c
> > b/drivers/gpu/drm/i915/intel_display.c
> > index 39400a0..2c682bc 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -13444,30 +13444,66 @@ static void verify_wm_state(struct
> > drm_crtc
> > *crtc,
> > struct drm_device *dev = crtc->dev;
> > struct drm_i915_private *dev_priv = to_i915(dev);
> > struct skl_ddb_allocation hw_ddb, *sw_ddb;
> > - struct skl_ddb_entry *hw_entry, *sw_entry;
> > + struct skl_pipe_wm hw_wm, *sw_wm;
> > + struct skl_plane_wm *hw_plane_wm, *sw_plane_wm;
> > + struct skl_ddb_entry *hw_ddb_entry, *sw_ddb_entry;
> > struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> > const enum pipe pipe = intel_crtc->pipe;
> > - int plane;
> > + int plane, level, max_level = ilk_wm_max_level(dev);
> >
> > if (INTEL_INFO(dev)->gen < 9 || !new_state->active)
> > return;
> >
> > + skl_pipe_wm_get_hw_state(crtc, &hw_wm);
> > + sw_wm = &intel_crtc->wm.active.skl;
> > +
> > skl_ddb_get_hw_state(dev_priv, &hw_ddb);
> > sw_ddb = &dev_priv->wm.skl_hw.ddb;
> >
> > /* planes */
> > for_each_plane(dev_priv, pipe, plane) {
> > - hw_entry = &hw_ddb.plane[pipe][plane];
> > - sw_entry = &sw_ddb->plane[pipe][plane];
> > + hw_plane_wm = &hw_wm.planes[plane];
> > + sw_plane_wm = &sw_wm->planes[plane];
> >
> > - if (skl_ddb_entry_equal(hw_entry, sw_entry))
> > - continue;
> > + /* Watermarks */
> > + for (level = 0; level <= max_level; level++) {
> > + if (skl_wm_level_equals(&hw_plane_wm-
> > >
> > > wm[level],
> > + &sw_plane_wm-
> > >
> > > wm[level]))
> > + continue;
> > +
> > + DRM_ERROR("mismatch in WM pipe %c plane %d
> > level %d (expected e=%d b=%d l=%d, got e=%d b=%d l=%d)\n",
> > + pipe_name(pipe), plane + 1,
> > level,
> > + sw_plane_wm->wm[level].plane_en,
> > + sw_plane_wm-
> > >
> > > wm[level].plane_res_b,
> > + sw_plane_wm-
> > >
> > > wm[level].plane_res_l,
> > + hw_plane_wm->wm[level].plane_en,
> > + hw_plane_wm-
> > >
> > > wm[level].plane_res_b,
> > + hw_plane_wm-
> > >
> > > wm[level].plane_res_l);
> > + }
> >
> > - DRM_ERROR("mismatch in DDB state pipe %c plane %d
> > "
> > - "(expected (%u,%u), found (%u,%u))\n",
> > - pipe_name(pipe), plane + 1,
> > - sw_entry->start, sw_entry->end,
> > - hw_entry->start, hw_entry->end);
> > + if (!skl_wm_level_equals(&hw_plane_wm->trans_wm,
> > + &sw_plane_wm->trans_wm))
> > {
> > + DRM_ERROR("mismatch in trans WM pipe %c
> > plane %d (expected e=%d b=%d l=%d, got e=%d b=%d l=%d)\n",
> > + pipe_name(pipe), plane + 1,
> > + sw_plane_wm->trans_wm.plane_en,
> > + sw_plane_wm-
> > >trans_wm.plane_res_b,
> > + sw_plane_wm-
> > >trans_wm.plane_res_l,
> > + hw_plane_wm->trans_wm.plane_en,
> > + hw_plane_wm-
> > >trans_wm.plane_res_b,
> > + hw_plane_wm-
> > >
> > > trans_wm.plane_res_l);
> > + }
> > +
> > + /* DDB */
> > + hw_ddb_entry = &hw_ddb.plane[pipe][plane];
> > + sw_ddb_entry = &sw_ddb->plane[pipe][plane];
> > +
> > + if (!skl_ddb_entry_equal(hw_ddb_entry,
> > sw_ddb_entry)) {
> > + DRM_ERROR("mismatch in DDB state pipe %c
> > plane %d "
> > + "(expected (%u,%u), found
> > (%u,%u))\n",
> > + pipe_name(pipe), plane + 1,
> > + sw_ddb_entry->start,
> > sw_ddb_entry-
> > >
> > > end,
> > + hw_ddb_entry->start,
> > hw_ddb_entry-
> > >
> > > end);
> > + }
> > }
> >
> > /*
> > @@ -13477,15 +13513,47 @@ static void verify_wm_state(struct
> > drm_crtc
> > *crtc,
> > * once the plane becomes visible, we can skip this check
> > */
> > if (intel_crtc->cursor_addr) {
> > - hw_entry = &hw_ddb.plane[pipe][PLANE_CURSOR];
> > - sw_entry = &sw_ddb->plane[pipe][PLANE_CURSOR];
> > + hw_plane_wm = &hw_wm.planes[PLANE_CURSOR];
> > + sw_plane_wm = &sw_wm->planes[PLANE_CURSOR];
> > +
> > + /* Watermarks */
> > + for (level = 0; level <= max_level; level++) {
> > + if (skl_wm_level_equals(&hw_plane_wm-
> > >
> > > wm[level],
> > + &sw_plane_wm-
> > >
> > > wm[level]))
> > + continue;
> > +
> > + DRM_ERROR("mismatch in WM pipe %c cursor
> > level %d (expected e=%d b=%d l=%d, got e=%d b=%d l=%d)\n",
> > + pipe_name(pipe), level,
> > + sw_plane_wm->wm[level].plane_en,
> > + sw_plane_wm-
> > >
> > > wm[level].plane_res_b,
> > + sw_plane_wm-
> > >
> > > wm[level].plane_res_l,
> > + hw_plane_wm->wm[level].plane_en,
> > + hw_plane_wm-
> > >
> > > wm[level].plane_res_b,
> > + hw_plane_wm-
> > >
> > > wm[level].plane_res_l);
> > + }
> > +
> > + if (!skl_wm_level_equals(&hw_plane_wm->trans_wm,
> > + &sw_plane_wm->trans_wm))
> > {
> > + DRM_ERROR("mismatch in trans WM pipe %c
> > cursor (expected e=%d b=%d l=%d, got e=%d b=%d l=%d)\n",
> > + pipe_name(pipe),
> > + sw_plane_wm->trans_wm.plane_en,
> > + sw_plane_wm-
> > >trans_wm.plane_res_b,
> > + sw_plane_wm-
> > >trans_wm.plane_res_l,
> > + hw_plane_wm->trans_wm.plane_en,
> > + hw_plane_wm-
> > >trans_wm.plane_res_b,
> > + hw_plane_wm-
> > >
> > > trans_wm.plane_res_l);
> > + }
> > +
> > + /* DDB */
> > + hw_ddb_entry = &hw_ddb.plane[pipe][PLANE_CURSOR];
> > + sw_ddb_entry = &sw_ddb->plane[pipe][PLANE_CURSOR];
> >
> > - if (!skl_ddb_entry_equal(hw_entry, sw_entry)) {
> > + if (!skl_ddb_entry_equal(hw_ddb_entry,
> > sw_ddb_entry)) {
> > DRM_ERROR("mismatch in DDB state pipe %c
> > cursor "
> > "(expected (%u,%u), found
> > (%u,%u))\n",
> > pipe_name(pipe),
> > - sw_entry->start, sw_entry->end,
> > - hw_entry->start, hw_entry->end);
> > + sw_ddb_entry->start,
> > sw_ddb_entry-
> > >
> > > end,
> > + hw_ddb_entry->start,
> > hw_ddb_entry-
> > >
> > > end);
> > }
> > }
> > }
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