From ff1750101351a225754ca4a14b83275c766cf540 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 21 Aug 2019 05:20:44 +0100 Subject: [PATCH] drm/i915/gtt: Relax assertion for pt_used When inserting the final level PTE, we check that we are not overflowing the page table (checking that pt_used does not exceed the size of the table). However, we have to allow for every other PTE to be pinned by a simultaneous removal thread (as on remove we bump the pt_used counter before adjusting the table). Signed-off-by: Chris Wilson Cc: Mika Kuoppala Reviewed-by: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20190821042044.7354-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_gem_gtt.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 2cd2dabbcd3bc..c9a4690bf8b1a 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -1110,7 +1110,8 @@ static int __gen8_ppgtt_alloc(struct i915_address_space * const vm, atomic_read(&pt->used)); atomic_add(count, &pt->used); - GEM_BUG_ON(atomic_read(&pt->used) > I915_PDES); + /* All other pdes may be simultaneously removed */ + GEM_BUG_ON(atomic_read(&pt->used) > 2 * I915_PDES); *start += count; } } while (idx++, --len);