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drm/i915: Only apply legacy PDE overflow detection to 3lvl machines

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Prevent the overflow check from firing on machines with the full 4lvl
page tables, that are not restricted to GEN8_LEGACY_PDES.

v2: Also fix the off-by-one in the compare

Fixes: 894ccebee2 ("drm/i915: Micro-optimise gen8_ppgtt_insert_entries()")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170217141455.19877-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
This commit is contained in:
Chris Wilson 2017-02-17 14:14:55 +00:00
parent f4a791819e
commit 5a55b527af
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/i915_gem_gtt.c
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@ -854,7 +854,8 @@ gen8_ppgtt_insert_pte_entries(struct i915_hw_ppgtt *ppgtt,
break;
}
GEM_BUG_ON(pdpe > GEN8_LEGACY_PDPES);
GEM_BUG_ON(!i915_vm_is_48bit(&ppgtt->base) &&
pdpe >= GEN8_LEGACY_PDPES);
pd = pdp->page_directory[pdpe];
pde = 0;
}