From: Ville Syrjälä Date: Tue, 9 Feb 2021 02:19:16 +0000 (+0200) Subject: drm/i915: Disallow plane x+w>stride on ilk+ with X-tiling X-Git-Tag: accepted/tizen/unified/20230118.172025~7733^2^2~4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=80cf9a88296c53bdbb1162d93d8640c8b2f58000;p=platform%2Fkernel%2Flinux-rpi.git drm/i915: Disallow plane x+w>stride on ilk+ with X-tiling ilk+ planes get notably unhappy when the plane x+w exceeds the stride. This wasn't a problem previously because we always aligned SURF to the closest tile boundary so the x offset never got particularly large. But now with async flips we have to align to 256KiB instead and thus this becomes a real issue. On ilk/snb/ivb it looks like the accesses just wrap early to the next tile row when scanout goes past the SURF+n*stride boundary, hsw/bdw suffer more heavily and start to underrun constantly. i965/g4x appear to be immune. vlv/chv I've not yet checked. Let's borrow another trick from the skl+ code and search backwards for a better SURF offset in the hopes of getting the x offset below the limit. IIRC when I ran into a similar issue on skl years ago it was causing the hardware to fall over pretty hard as well. And let's be consistent and include i965/g4x in the check as well, just in case I just got super lucky somehow when I wasn't able to reproduce the issue. Not that it really matters since we still use 4k SURF alignment for i965/g4x anyway. Fixes: 6ede6b0616b2 ("drm/i915: Implement async flips for vlv/chv") Fixes: 4bb18054adc4 ("drm/i915: Implement async flip for ilk/snb") Fixes: 2a636e240c77 ("drm/i915: Implement async flip for ivb/hsw") Fixes: cda195f13abd ("drm/i915: Implement async flips for bdw") Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20210209021918.16234-1-ville.syrjala@linux.intel.com Reviewed-by: Chris Wilson (cherry picked from commit 59fb8218c8e5001f854e7d5fdb5fb135cba58102) Signed-off-by: Rodrigo Vivi [Rodrigo also exported some functions from intel_display.c during backport] --- diff --git a/drivers/gpu/drm/i915/display/i9xx_plane.c b/drivers/gpu/drm/i915/display/i9xx_plane.c index d30374d..e3e69e6 100644 --- a/drivers/gpu/drm/i915/display/i9xx_plane.c +++ b/drivers/gpu/drm/i915/display/i9xx_plane.c @@ -256,6 +256,33 @@ int i9xx_check_plane_surface(struct intel_plane_state *plane_state) offset = 0; /* + * When using an X-tiled surface the plane starts to + * misbehave if the x offset + width exceeds the stride. + * hsw/bdw: underrun galore + * ilk/snb/ivb: wrap to the next tile row mid scanout + * i965/g4x: so far appear immune to this + * vlv/chv: TODO check + * + * Linear surfaces seem to work just fine, even on hsw/bdw + * despite them not using the linear offset anymore. + */ + if (INTEL_GEN(dev_priv) >= 4 && fb->modifier == I915_FORMAT_MOD_X_TILED) { + u32 alignment = intel_surf_alignment(fb, 0); + int cpp = fb->format->cpp[0]; + + while ((src_x + src_w) * cpp > plane_state->color_plane[0].stride) { + if (offset == 0) { + drm_dbg_kms(&dev_priv->drm, + "Unable to find suitable display surface offset due to X-tiling\n"); + return -EINVAL; + } + + offset = intel_plane_adjust_aligned_offset(&src_x, &src_y, plane_state, 0, + offset, offset - alignment); + } + } + + /* * Put the final coordinates back so that the src * coordinate checks will see the right values. */ diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c index 9843a0f..7ea1e5b 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -1322,8 +1322,8 @@ static bool has_async_flips(struct drm_i915_private *i915) return INTEL_GEN(i915) >= 5; } -static unsigned int intel_surf_alignment(const struct drm_framebuffer *fb, - int color_plane) +unsigned int intel_surf_alignment(const struct drm_framebuffer *fb, + int color_plane) { struct drm_i915_private *dev_priv = to_i915(fb->dev); @@ -1590,10 +1590,10 @@ static u32 intel_adjust_aligned_offset(int *x, int *y, * Adjust the tile offset by moving the difference into * the x/y offsets. */ -static u32 intel_plane_adjust_aligned_offset(int *x, int *y, - const struct intel_plane_state *state, - int color_plane, - u32 old_offset, u32 new_offset) +u32 intel_plane_adjust_aligned_offset(int *x, int *y, + const struct intel_plane_state *state, + int color_plane, + u32 old_offset, u32 new_offset) { return intel_adjust_aligned_offset(x, y, state->hw.fb, color_plane, state->hw.rotation, diff --git a/drivers/gpu/drm/i915/display/intel_display.h b/drivers/gpu/drm/i915/display/intel_display.h index 64ffa345..76f8a80 100644 --- a/drivers/gpu/drm/i915/display/intel_display.h +++ b/drivers/gpu/drm/i915/display/intel_display.h @@ -653,6 +653,12 @@ void intel_plane_unpin_fb(struct intel_plane_state *old_plane_state); struct intel_encoder * intel_get_crtc_new_encoder(const struct intel_atomic_state *state, const struct intel_crtc_state *crtc_state); +unsigned int intel_surf_alignment(const struct drm_framebuffer *fb, + int color_plane); +u32 intel_plane_adjust_aligned_offset(int *x, int *y, + const struct intel_plane_state *state, + int color_plane, + u32 old_offset, u32 new_offset); /* modesetting */ void intel_modeset_init_hw(struct drm_i915_private *i915);