diff options
| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2010-04-17 15:12:03 +0200 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2010-04-18 17:58:24 -0700 |
| commit | c36a2a6de59e4a141a68b7575de837d3b0bd96b3 (patch) | |
| tree | 172e41c10e58c2c87dc488ebdd22d664041e21b5 /drivers/gpu/drm/i915/i915_gem_tiling.c | |
| parent | 3143751ff51a163b77f7efd389043e038f3e008e (diff) | |
drm/i915: fix tiling limits for i915 class hw v2
Current code is definitely crap: Largest pitch allowed spills into
the TILING_Y bit of the fence registers ... :(
I've rewritten the limits check under the assumption that 3rd gen hw
has a 3d pitch limit of 8kb (like 2nd gen). This is supported by an
otherwise totally misleading XXX comment.
This bug mostly resulted in tiling-corrupted pixmaps because the kernel
allowed too wide buffers to be tiled. Bug brought to the light by the
xf86-video-intel 2.11 release because that unconditionally enabled
tiling for pixmaps, relying on the kernel to check things. Tiling for
the framebuffer was not affected because the ddx does some additional
checks there ensure the buffer is within hw-limits.
v2: Instead of computing the value that would be written into the
hw fence registers and then checking the limits simply check whether
the stride is above the 8kb limit. To better document the hw, add
some WARN_ONs in i915_write_fence_reg like I've done for the i830
case (using the right limits).
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=27449
Tested-by: Alexander Lam <lambchop468@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_tiling.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_tiling.c | 22 |
1 files changed, 9 insertions, 13 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c index 449157f7161..4bdccefcf2c 100644 --- a/drivers/gpu/drm/i915/i915_gem_tiling.c +++ b/drivers/gpu/drm/i915/i915_gem_tiling.c @@ -202,21 +202,17 @@ i915_tiling_ok(struct drm_device *dev, int stride, int size, int tiling_mode) * reg, so dont bother to check the size */ if (stride / 128 > I965_FENCE_MAX_PITCH_VAL) return false; - } else if (IS_I9XX(dev)) { - uint32_t pitch_val = ffs(stride / tile_width) - 1; - - /* XXX: For Y tiling, FENCE_MAX_PITCH_VAL is actually 6 (8KB) - * instead of 4 (2KB) on 945s. - */ - if (pitch_val > I915_FENCE_MAX_PITCH_VAL || - size > (I830_FENCE_MAX_SIZE_VAL << 20)) + } else if (IS_GEN3(dev) || IS_GEN2(dev)) { + if (stride > 8192) return false; - } else { - uint32_t pitch_val = ffs(stride / tile_width) - 1; - if (pitch_val > I830_FENCE_MAX_PITCH_VAL || - size > (I830_FENCE_MAX_SIZE_VAL << 19)) - return false; + if (IS_GEN3(dev)) { + if (size > I830_FENCE_MAX_SIZE_VAL << 20) + return false; + } else { + if (size > I830_FENCE_MAX_SIZE_VAL << 19) + return false; + } } /* 965+ just needs multiples of tile width */ |