We need to be able to reclaim from any process context, including the shrinker. We can simulate being inside the shrinker using lockdep and adjusting the task's reclaim state.
References: https://bugs.freedesktop.org/show_bug.cgi?id=101857 Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk> --- drivers/gpu/drm/i915/selftests/intel_hangcheck.c | 39 ++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c index 4129d01b67a1..f800bf7a822d 100644 --- a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c +++ b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c @@ -359,6 +359,44 @@ static int igt_global_reset(void *arg) return err; } +static int igt_reclaim_reset(void *arg) +{ + struct drm_i915_private *i915 = arg; + unsigned int reset_count; + int err = 0; + + /* Check that we can perform a reset from inside the shrinker/kswapd */ + + global_reset_lock(i915); + set_bit(I915_RESET_HANDOFF, &i915->gpu_error.flags); + + mutex_lock(&i915->drm.struct_mutex); + reset_count = i915_reset_count(&i915->gpu_error); + + /* We need to support resets from any process context, including + * from inside the shrinker. + */ + lockdep_set_current_reclaim_state(GFP_KERNEL); + + i915_reset(i915, I915_RESET_QUIET); + + lockdep_clear_current_reclaim_state(); + + if (i915_reset_count(&i915->gpu_error) == reset_count) { + pr_err("No GPU reset recorded!\n"); + err = -EINVAL; + } + mutex_unlock(&i915->drm.struct_mutex); + + GEM_BUG_ON(test_bit(I915_RESET_HANDOFF, &i915->gpu_error.flags)); + global_reset_unlock(i915); + + if (i915_terminally_wedged(&i915->gpu_error)) + err = -EIO; + + return err; +} + static int igt_reset_engine(void *arg) { struct drm_i915_private *i915 = arg; @@ -840,6 +878,7 @@ int intel_hangcheck_live_selftests(struct drm_i915_private *i915) static const struct i915_subtest tests[] = { SUBTEST(igt_hang_sanitycheck), SUBTEST(igt_global_reset), + SUBTEST(igt_reclaim_reset), SUBTEST(igt_reset_engine), SUBTEST(igt_reset_active_engines), SUBTEST(igt_wait_reset), -- 2.13.3 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
