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drm/i915: A hotfix for making aliasing PPGTT work for GVT-g 

This patch makes PPGTT page table non-shrinkable when using aliasing PPGTT
mode. It's just a temporary solution for making GVT-g work.

Fixes: 2ce5179fe8 ("drm/i915/gtt: Free unused lower-level page tables")
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Michal Winiarski <michal.winiarski@intel.com>
Cc: Michel Thierry <michel.thierry@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Zhiyuan Lv <zhiyuan.lv@intel.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1486559013-25251-2-git-send-email-zhi.a.wang@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: <drm-intel-fixes@lists.freedesktop.org> # v4.10-rc1+
Cc: stable@vger.kernel.org
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Zhi Wang 2017-02-08 21:03:33 +08:00 committed by Chris Wilson
parent b71953a16d
commit e81ecb5e31
1 changed files with 4 additions and 3 deletions
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7
drivers/gpu/drm/i915/i915_gem_gtt.c
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@ -755,9 +755,10 @@ static bool gen8_ppgtt_clear_pt(struct i915_address_space *vm,
GEM_BUG_ON(pte_end > GEN8_PTES);
bitmap_clear(pt->used_ptes, pte, num_entries);
if (bitmap_empty(pt->used_ptes, GEN8_PTES))
return true;
if (USES_FULL_PPGTT(vm->i915)) {
if (bitmap_empty(pt->used_ptes, GEN8_PTES))
return true;
}
pt_vaddr = kmap_px(pt);