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drm/i915/gtt: Fix the boundary check for vm area

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The check for start + length >= total_vm_size is
wrong since start + length can be exactly the size of
the vm.

Fix the check to allow allocation to boundary.

Fixes a regression in commit 4dd738e9cd
("drm/i915: Fix 32b overflow check in gen8_ppgtt_alloc_page_directories")

Testcase: igt/gem_evict_everything/swapping-interruptible
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90399
Tested-by: Lu Hua <huax.lu@intel.com>
Cc: Chris Wilson <chris@chris.wilson.co.uk>
Cc: Dave Gordon <david.s.gordon@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Mika Kuoppala
2015-05-12 10:35:08 +03:00
committed by Daniel Vetter
parent af99ceda2d
commit f3e06f1156
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/gpu/drm/i915/i915_gem_gtt.c
+1 -1
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@@ -757,7 +757,7 @@ static int gen8_ppgtt_alloc_page_directories(struct i915_hw_ppgtt *ppgtt,
WARN_ON(!bitmap_empty(new_pds, GEN8_LEGACY_PDPES));
/* FIXME: upper bound must not overflow 32 bits */
WARN_ON((start + length) >= (1ULL << 32));
WARN_ON((start + length) > (1ULL << 32));
gen8_for_each_pdpe(pd, pdp, start, length, temp, pdpe) {
if (pd)