Try to catch a bug we've seen in the wild where the shrinker purges the pd/pdp from under us while allocating our paging structures. References: https://bugs.freedesktop.org/show_bug.cgi?id=104773 Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 84 +++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c index bb7cf998fc65..a40a2a7514fd 100644 --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c @@ -885,6 +885,84 @@ static int shrink_hole(struct drm_i915_private *i915, return err; } +static int shrink_boom(struct drm_i915_private *i915, + struct i915_address_space *vm, + u64 hole_start, u64 hole_end, + unsigned long end_time) +{ + unsigned int sizes[] = {SZ_2M, SZ_1G}; + struct drm_i915_gem_object *purge; + struct drm_i915_gem_object *explode; + struct i915_vma *vma; + unsigned int flags = PIN_USER | PIN_OFFSET_FIXED; + int err; + int i; + + /* + * Catch the case which shrink_hole seems to miss. The setup here + * requires invoking the shrinker as we do the alloc_pt/alloc_pd, while + * ensuring that all vma assiocated with the respective pd/pdp are + * unpinned at the time. + */ + + for (i = 0; i < ARRAY_SIZE(sizes); ++i) { + unsigned int size = sizes[i]; + + purge = fake_dma_object(i915, size); + if (IS_ERR(purge)) + return PTR_ERR(purge); + + vma = i915_vma_instance(purge, vm, NULL); + if (IS_ERR(vma)) { + err = PTR_ERR(vma); + goto err_purge; + } + + err = i915_vma_pin(vma, 0, 0, flags); + if (err) + goto err_purge; + + /* Should now be ripe for purging */ + i915_vma_unpin(vma); + + explode = fake_dma_object(i915, size); + if (IS_ERR(explode)) { + err = PTR_ERR(purge); + goto err_purge; + } + + vm->fault_attr.probability = 100; + vm->fault_attr.interval = 1; + atomic_set(&vm->fault_attr.times, -1); + + vma = i915_vma_instance(explode, vm, NULL); + if (IS_ERR(vma)) { + err = PTR_ERR(vma); + goto err_explode; + } + + err = i915_vma_pin(vma, 0, 0, flags | size); + if (err) + goto err_explode; + + i915_vma_unpin(vma); + + i915_gem_object_put(purge); + i915_gem_object_put(explode); + + memset(&vm->fault_attr, 0, sizeof(vm->fault_attr)); + } + + return 0; + +err_explode: + i915_gem_object_put(explode); +err_purge: + i915_gem_object_put(purge); + + return err; +} + static int exercise_ppgtt(struct drm_i915_private *dev_priv, int (*func)(struct drm_i915_private *i915, struct i915_address_space *vm, @@ -953,6 +1031,11 @@ static int igt_ppgtt_shrink(void *arg) return exercise_ppgtt(arg, shrink_hole); } +static int igt_ppgtt_shrink_boom(void *arg) +{ + return exercise_ppgtt(arg, shrink_boom); +} + static int sort_holes(void *priv, struct list_head *A, struct list_head *B) { struct drm_mm_node *a = list_entry(A, typeof(*a), hole_stack); @@ -1577,6 +1660,7 @@ int i915_gem_gtt_live_selftests(struct drm_i915_private *i915) SUBTEST(igt_ppgtt_pot), SUBTEST(igt_ppgtt_fill), SUBTEST(igt_ppgtt_shrink), + SUBTEST(igt_ppgtt_shrink_boom), SUBTEST(igt_ggtt_lowlevel), SUBTEST(igt_ggtt_drunk), SUBTEST(igt_ggtt_walk), -- 2.14.3 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
