On Tue, Sep 23, 2014 at 12:41:56PM -0300, Gustavo Padovan wrote:
> 2014-09-23 Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>:
>
> > On Mon, Sep 22, 2014 at 07:23:10PM -0300, Gustavo Padovan wrote:
> > > From: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx>
> > >
> > > Move checks inside intel_crtc_cursor_set_obj() to
> > > intel_check_cursor_plane(), we only use they there so move them out to
> > > make the merge of intel_crtc_cursor_set_obj() into
> > > intel_check_cursor_plane() easier.
> > >
> > > This is another step toward the atomic modesetting support and unification
> > > of plane operations such pin/unpin of fb objects on i915.
> > >
> > > v2: take Ville's comment: move crtc_{w,h} assignment a bit down in the
> > > code
> > >
> > > Signed-off-by: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx>
> > > ---
> > > drivers/gpu/drm/i915/intel_display.c | 61 ++++++++++++++++++++++++------------
> > > 1 file changed, 41 insertions(+), 20 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > > index 2ef1836..3f37e93 100644
> > > --- a/drivers/gpu/drm/i915/intel_display.c
> > > +++ b/drivers/gpu/drm/i915/intel_display.c
> > > @@ -8373,7 +8373,7 @@ static int intel_crtc_cursor_set_obj(struct drm_crtc *crtc,
> > > struct drm_i915_private *dev_priv = dev->dev_private;
> > > struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> > > enum pipe pipe = intel_crtc->pipe;
> > > - unsigned old_width, stride;
> > > + unsigned old_width;
> > > uint32_t addr;
> > > int ret;
> > >
> > > @@ -8385,29 +8385,11 @@ static int intel_crtc_cursor_set_obj(struct drm_crtc *crtc,
> > > goto finish;
> > > }
> > >
> > > - /* Check for which cursor types we support */
> > > - if (!cursor_size_ok(dev, width, height)) {
> > > - DRM_DEBUG("Cursor dimension not supported\n");
> > > - return -EINVAL;
> > > - }
> > > -
> > > - stride = roundup_pow_of_two(width) * 4;
> > > - if (obj->base.size < stride * height) {
> > > - DRM_DEBUG_KMS("buffer is too small\n");
> > > - return -ENOMEM;
> > > - }
> > > -
> > > /* we only need to pin inside GTT if cursor is non-phy */
> > > mutex_lock(&dev->struct_mutex);
> > > if (!INTEL_INFO(dev)->cursor_needs_physical) {
> > > unsigned alignment;
> > >
> > > - if (obj->tiling_mode) {
> > > - DRM_DEBUG_KMS("cursor cannot be tiled\n");
> > > - ret = -EINVAL;
> > > - goto fail_locked;
> > > - }
> > > -
> > > /*
> > > * Global gtt pte registers are special registers which actually
> > > * forward writes to a chunk of system memory. Which means that
> > > @@ -11826,16 +11808,55 @@ intel_check_cursor_plane(struct drm_plane *plane,
> > > struct intel_plane_state *state)
> > > {
> > > struct drm_crtc *crtc = state->crtc;
> > > + struct drm_device *dev = crtc->dev;
> > > struct drm_framebuffer *fb = state->fb;
> > > struct drm_rect *dest = &state->dst;
> > > struct drm_rect *src = &state->src;
> > > const struct drm_rect *clip = &state->clip;
> > > + struct drm_i915_gem_object *obj = intel_fb_obj(fb);
> > > + int crtc_w, crtc_h;
> > > + unsigned stride;
> > > + int ret;
> > >
> > > - return drm_plane_helper_check_update(plane, crtc, fb,
> > > + ret = drm_plane_helper_check_update(plane, crtc, fb,
> > > src, dest, clip,
> > > DRM_PLANE_HELPER_NO_SCALING,
> > > DRM_PLANE_HELPER_NO_SCALING,
> > > true, true, &state->visible);
> > > + if (ret)
> > > + return ret;
> > > +
> > > +
> > > + /* if we want to turn off the cursor ignore width and height */
> > > + if (!obj)
> > > + return 0;
> > > +
> > > + if (fb == crtc->cursor->fb)
> > > + return 0;
> >
> > Hmm. This check needs to be after the cursor/obj size checks. Otherwise
> > we wouldn't reject invalid sized cursors when the fb didn't change. I
> > suppose we could also just drop this check, but it can still save us from
> > doing the tiling check since that can't have changed if the fb hasn't
> > changed so maybe it's worth keeping. But either solution is fine by me.
>
> Only if this was a bug before this patch, if you look at the original
> intel_commit_cursor_plane() we do two things when the fbs are the same:
>
> intel_crtc_update_cursor();
> intel_frontbuffer_flip();
>
> No checks are performed, that is why I put the fbs check before any other
> check to make the code as similar as possible to what it was before.
I guess we already had the bug then. Not entirely unsurprising given the
recent history of this code. Probably better to have the fix as a separate
patch then to avoid mixing restructuring and functional changes in the
same patch.
>
> > > +
> > > + /* Check for which cursor types we support */
> > > + crtc_w = drm_rect_width(&state->orig_dst);
> > > + crtc_h = drm_rect_height(&state->orig_dst);
> > > + if (!cursor_size_ok(dev, crtc_w, crtc_h)) {
> > > + DRM_DEBUG("Cursor dimension not supported\n");
> > > + return -EINVAL;
> > > + }
> > > +
> > > + stride = roundup_pow_of_two(crtc_w) * 4;
> > > + if (obj->base.size < stride * crtc_h) {
> > > + DRM_DEBUG_KMS("buffer is too small\n");
> > > + return -ENOMEM;
> > > + }
> > > +
> > > + /* we only need to pin inside GTT if cursor is non-phy */
> > > + mutex_lock(&dev->struct_mutex);
> > > + if (!INTEL_INFO(dev)->cursor_needs_physical && obj->tiling_mode) {
> > > + DRM_DEBUG_KMS("cursor cannot be tiled\n");
> > > + ret = -EINVAL;
> > > + }
> > > + mutex_unlock(&dev->struct_mutex);
> > > +
> > > + return ret;
> >
> > 'return 0' seems better here.
>
> ret can be -EINVAL, the code inside the mutex 3 lines above can set ret.
Oh, somehow I missed that one. You can leave the patch as is then.
>
> Gustavo
--
Ville Syrjälä
Intel OTC
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