[PATCH 64/79] drm/i915: Add initial selftests for hang detection and resets
Chris Wilson
chris at chris-wilson.co.uk
Sun Jan 1 19:37:14 UTC 2017
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/intel_hangcheck.c | 4 +
.../gpu/drm/i915/selftests/i915_live_selftests.h | 1 +
drivers/gpu/drm/i915/selftests/intel_hangcheck.c | 438 +++++++++++++++++++++
3 files changed, 443 insertions(+)
create mode 100644 drivers/gpu/drm/i915/selftests/intel_hangcheck.c
diff --git a/drivers/gpu/drm/i915/intel_hangcheck.c b/drivers/gpu/drm/i915/intel_hangcheck.c
index f05971f5586f..dce742243ba6 100644
--- a/drivers/gpu/drm/i915/intel_hangcheck.c
+++ b/drivers/gpu/drm/i915/intel_hangcheck.c
@@ -480,3 +480,7 @@ void intel_hangcheck_init(struct drm_i915_private *i915)
INIT_DELAYED_WORK(&i915->gpu_error.hangcheck_work,
i915_hangcheck_elapsed);
}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "selftests/intel_hangcheck.c"
+#endif
diff --git a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
index afd43e423eba..1d6f1c73c92c 100644
--- a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
@@ -13,3 +13,4 @@ selftest(uncore, intel_uncore_live_selftests)
selftest(requests, i915_gem_request_live_selftests)
selftest(object, i915_gem_object_live_selftests)
selftest(gtt, i915_gem_gtt_live_selftests)
+selftest(hangcheck, intel_hangcheck_live_selftests)
diff --git a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
new file mode 100644
index 000000000000..5f51da50185e
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
@@ -0,0 +1,438 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include "i915_selftest.h"
+
+struct hang {
+ struct drm_i915_private *i915;
+ struct drm_i915_gem_object *hws;
+ struct drm_i915_gem_object *obj;
+ u32 *seqno;
+ u32 *batch;
+};
+
+static int hang_init(struct hang *h, struct drm_i915_private *i915)
+{
+ void *vaddr;
+
+ memset(h, 0, sizeof(*h));
+ h->i915 = i915;
+
+ h->hws = i915_gem_object_create_internal(i915, PAGE_SIZE);
+ if (IS_ERR(h->hws))
+ return PTR_ERR(h->hws);
+
+ h->obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
+ if (IS_ERR(h->obj)) {
+ i915_gem_object_put(h->obj);
+ return PTR_ERR(h->obj);
+ }
+
+ i915_gem_object_set_cache_level(h->hws, I915_CACHE_LLC);
+ vaddr = i915_gem_object_pin_map(h->hws, I915_MAP_WB);
+ if (IS_ERR(vaddr)) {
+ i915_gem_object_put(h->hws);
+ i915_gem_object_put(h->obj);
+ return PTR_ERR(vaddr);
+ }
+ h->seqno = memset(vaddr, 0xff, PAGE_SIZE);
+
+ vaddr = i915_gem_object_pin_map(h->obj,
+ HAS_LLC(i915) ? I915_MAP_WB : I915_MAP_WC);
+ if (IS_ERR(vaddr)) {
+ i915_gem_object_unpin_map(h->hws);
+ i915_gem_object_put(h->hws);
+ i915_gem_object_put(h->obj);
+ return PTR_ERR(vaddr);
+ }
+ h->batch = vaddr;
+
+ return 0;
+}
+
+static u64 hws_address(const struct i915_vma *hws,
+ const struct drm_i915_gem_request *rq)
+{
+ return hws->node.start + offset_in_page(sizeof(u32)*rq->fence.context);
+}
+
+static int emit_recurse_batch(struct hang *h,
+ struct drm_i915_gem_request *rq)
+{
+ struct drm_i915_private *i915 = h->i915;
+ struct i915_address_space *vm = rq->ctx->ppgtt ? &rq->ctx->ppgtt->base : &i915->ggtt.base;
+ struct i915_vma *hws, *vma;
+ u32 *batch;
+ int err;
+
+ vma = i915_gem_obj_lookup_or_create_vma(h->obj, vm, NULL);
+ if (IS_ERR(vma))
+ return PTR_ERR(vma);
+
+ hws = i915_gem_obj_lookup_or_create_vma(h->hws, vm, NULL);
+ if (IS_ERR(hws))
+ return PTR_ERR(hws);
+
+ err = i915_vma_pin(vma, 0, 0, PIN_USER);
+ if (err)
+ return err;
+
+ err = i915_vma_pin(hws, 0, 0, PIN_USER);
+ if (err)
+ goto unpin_vma;
+
+ i915_vma_move_to_active(vma, rq, 0);
+ i915_vma_move_to_active(hws, rq, 0);
+
+ batch = h->batch;
+ if (INTEL_GEN(i915) >= 8) {
+ *batch++ = MI_STORE_DWORD_IMM_GEN4;
+ *batch++ = lower_32_bits(hws_address(hws, rq));
+ *batch++ = upper_32_bits(hws_address(hws, rq));
+ *batch++ = rq->fence.seqno;
+ *batch++ = MI_BATCH_BUFFER_START | 1 << 8 | 1;
+ *batch++ = lower_32_bits(vma->node.start);
+ *batch++ = upper_32_bits(vma->node.start);
+ } else if (INTEL_GEN(i915) >= 6) {
+ *batch++ = MI_STORE_DWORD_IMM_GEN4;
+ *batch++ = 0;
+ *batch++ = lower_32_bits(hws_address(hws, rq));
+ *batch++ = rq->fence.seqno;
+ *batch++ = MI_BATCH_BUFFER_START | 1 << 8;
+ *batch++ = lower_32_bits(vma->node.start);
+ } else if (INTEL_GEN(i915) >= 4) {
+ *batch++ = MI_STORE_DWORD_IMM_GEN4;
+ *batch++ = 0;
+ *batch++ = lower_32_bits(hws_address(hws, rq));
+ *batch++ = rq->fence.seqno;
+ *batch++ = MI_BATCH_BUFFER_START | 2 << 6;
+ *batch++ = lower_32_bits(vma->node.start);
+ } else {
+ *batch++ = MI_STORE_DWORD_IMM;
+ *batch++ = lower_32_bits(hws_address(hws, rq));
+ *batch++ = rq->fence.seqno;
+ *batch++ = MI_BATCH_BUFFER_START | 2 << 6 | 1;
+ *batch++ = lower_32_bits(vma->node.start);
+ }
+
+ err = rq->engine->emit_bb_start(rq, vma->node.start, PAGE_SIZE, 0);
+
+ i915_vma_unpin(hws);
+unpin_vma:
+ i915_vma_unpin(vma);
+ return err;
+}
+
+static struct drm_i915_gem_request *
+hang_create_request(struct hang *h,
+ struct intel_engine_cs *engine,
+ struct i915_gem_context *ctx)
+{
+ struct drm_i915_gem_request *rq;
+ int err;
+
+ if (i915_gem_object_is_active(h->obj)) {
+ struct drm_i915_gem_object *obj;
+ void *vaddr;
+
+ obj = i915_gem_object_create_internal(h->i915, PAGE_SIZE);
+ if (IS_ERR(obj))
+ return ERR_CAST(obj);
+
+ vaddr = i915_gem_object_pin_map(obj,
+ HAS_LLC(h->i915) ? I915_MAP_WB : I915_MAP_WC);
+ if (IS_ERR(vaddr)) {
+ i915_gem_object_put(obj);
+ return ERR_CAST(vaddr);
+ }
+
+ i915_gem_object_unpin_map(h->obj);
+ __i915_gem_object_release_unless_active(h->obj);
+
+ h->obj = obj;
+ h->batch = vaddr;
+ }
+
+ rq = i915_gem_request_alloc(engine, ctx);
+ if (IS_ERR(rq))
+ return rq;
+
+ err = emit_recurse_batch(h, rq);
+ if (err) {
+ __i915_add_request(rq, false);
+ return ERR_PTR(err);
+ }
+
+ return rq;
+}
+
+static u32 hws_seqno(const struct hang *h,
+ const struct drm_i915_gem_request *rq)
+{
+ return READ_ONCE(h->seqno[rq->fence.context % (PAGE_SIZE/sizeof(u32))]);
+}
+
+static void hang_fini(struct hang *h)
+{
+ *h->batch = MI_BATCH_BUFFER_END;
+
+ i915_gem_object_unpin_map(h->obj);
+ __i915_gem_object_release_unless_active(h->obj);
+
+ i915_gem_object_unpin_map(h->hws);
+ __i915_gem_object_release_unless_active(h->hws);
+}
+
+static int igt_hang_sanitycheck(void *arg)
+{
+ struct drm_i915_private *i915 = arg;
+ struct drm_i915_gem_request *rq;
+ struct hang h;
+ int err;
+
+ mutex_lock(&i915->drm.struct_mutex);
+ err = hang_init(&h, i915);
+ if (err)
+ goto unlock;
+
+ rq = hang_create_request(&h, i915->engine[RCS], i915->kernel_context);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ goto fini;
+ }
+
+ i915_gem_request_get(rq);
+
+ *h.batch = MI_BATCH_BUFFER_END;
+ __i915_add_request(rq, true);
+
+ i915_wait_request(rq, I915_WAIT_LOCKED, MAX_SCHEDULE_TIMEOUT);
+ i915_gem_request_put(rq);
+
+fini:
+ hang_fini(&h);
+unlock:
+ mutex_unlock(&i915->drm.struct_mutex);
+ return err;
+}
+
+static int igt_global_reset(void *arg)
+{
+ struct drm_i915_private *i915 = arg;
+ unsigned int reset_count;
+ int err = 0;
+
+ if (!intel_has_gpu_reset(i915))
+ return 0;
+
+ set_bit(I915_RESET_IN_PROGRESS, &i915->gpu_error.flags);
+
+ mutex_lock(&i915->drm.struct_mutex);
+ reset_count = i915_reset_count(&i915->gpu_error);
+
+ i915_reset(i915);
+
+ 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_IN_PROGRESS, &i915->gpu_error.flags));
+ if (i915_terminally_wedged(&i915->gpu_error))
+ err = -EIO;
+
+ return err;
+}
+
+static u32 fake_hangcheck(struct drm_i915_gem_request *rq)
+{
+ u32 reset_count;
+
+ rq->engine->hangcheck.stalled = true;
+ rq->engine->hangcheck.seqno = intel_engine_get_seqno(rq->engine);
+
+ reset_count = i915_reset_count(&rq->i915->gpu_error);
+
+ set_bit(I915_RESET_IN_PROGRESS, &rq->i915->gpu_error.flags);
+ wake_up_all(&rq->i915->gpu_error.wait_queue);
+
+ return reset_count;
+}
+
+static bool wait_for_hang(struct hang *h, struct drm_i915_gem_request *rq)
+{
+ return !(wait_for_us(i915_seqno_passed(hws_seqno(h, rq),
+ rq->fence.seqno),
+ 10) &&
+ wait_for(i915_seqno_passed(hws_seqno(h, rq),
+ rq->fence.seqno),
+ 1000));
+}
+
+static int igt_wait_reset(void *arg)
+{
+ struct drm_i915_private *i915 = arg;
+ struct drm_i915_gem_request *rq;
+ unsigned int reset_count;
+ struct hang h;
+ long timeout;
+ int err;
+
+ if (!intel_has_gpu_reset(i915))
+ return 0;
+
+ set_bit(I915_RESET_IN_PROGRESS, &i915->gpu_error.flags);
+
+ mutex_lock(&i915->drm.struct_mutex);
+ err = hang_init(&h, i915);
+ if (err)
+ goto unlock;
+
+ rq = hang_create_request(&h, i915->engine[RCS], i915->kernel_context);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ goto fini;
+ }
+
+ i915_gem_request_get(rq);
+ __i915_add_request(rq, true);
+
+ if (!wait_for_hang(&h, rq)) {
+ pr_err("Failed to start request %x\n", rq->fence.seqno);
+ err = -EIO;
+ goto fini;
+ }
+
+ reset_count = fake_hangcheck(rq);
+
+ timeout = i915_wait_request(rq, I915_WAIT_LOCKED, 10);
+ if (timeout < 0) {
+ pr_err("i915_wait_request failed on a stuck request: err=%ld\n",
+ timeout);
+ err = timeout;
+ goto fini;
+ }
+ GEM_BUG_ON(test_bit(I915_RESET_IN_PROGRESS, &i915->gpu_error.flags));
+
+ if (i915_reset_count(&i915->gpu_error) == reset_count) {
+ pr_err("No GPU reset recorded!\n");
+ err = -EINVAL;
+ goto fini;
+ }
+
+fini:
+ hang_fini(&h);
+unlock:
+ mutex_unlock(&i915->drm.struct_mutex);
+
+ if (i915_terminally_wedged(&i915->gpu_error))
+ return -EIO;
+
+ return err;
+}
+
+static int igt_reset_queue(void *arg)
+{
+ I915_SELFTEST_TIMEOUT(end_time);
+ struct drm_i915_private *i915 = arg;
+ struct drm_i915_gem_request *prev;
+ unsigned int count;
+ struct hang h;
+ int err;
+
+ if (!intel_has_gpu_reset(i915))
+ return 0;
+
+ mutex_lock(&i915->drm.struct_mutex);
+ err = hang_init(&h, i915);
+ if (err)
+ goto unlock;
+
+ prev = hang_create_request(&h, i915->engine[RCS], i915->kernel_context);
+ if (IS_ERR(prev)) {
+ err = PTR_ERR(prev);
+ goto fini;
+ }
+
+ i915_gem_request_get(prev);
+ __i915_add_request(prev, true);
+
+ if (!wait_for_hang(&h, prev)) {
+ pr_err("Failed to start request %x\n", prev->fence.seqno);
+ err = -EIO;
+ goto fini;
+ }
+
+ count = 0;
+ do {
+ struct drm_i915_gem_request *rq;
+ unsigned int reset_count;
+
+ rq = hang_create_request(&h, i915->engine[RCS], i915->kernel_context);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ goto fini;
+ }
+
+ i915_gem_request_get(rq);
+ __i915_add_request(rq, true);
+
+ reset_count = fake_hangcheck(prev);
+
+ i915_reset(i915);
+
+ GEM_BUG_ON(test_bit(I915_RESET_IN_PROGRESS, &i915->gpu_error.flags));
+ if (i915_reset_count(&i915->gpu_error) == reset_count) {
+ pr_err("No GPU reset recorded!\n");
+ err = -EINVAL;
+ goto fini;
+ }
+
+ prev = rq;
+ count++;
+ } while (time_before(jiffies, end_time));
+ pr_info("Completed %d resets\n", count);
+
+fini:
+ hang_fini(&h);
+unlock:
+ mutex_unlock(&i915->drm.struct_mutex);
+
+ if (i915_terminally_wedged(&i915->gpu_error))
+ return -EIO;
+
+ return err;
+}
+
+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_wait_reset),
+ SUBTEST(igt_reset_queue),
+ };
+ return i915_subtests(tests, i915);
+}
--
2.11.0
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