[Intel-gfx] [PATCH 2/3] drm/i915: Add live selftests for indirect ctx batchbuffers

[Mika Kuoppala]

Add live selftest for indirect ctx context batchbuffers

Signed-off-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
---
 drivers/gpu/drm/i915/gt/selftest_lrc.c | 152 ++++++++++++++++++++++++-
 1 file changed, 151 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index 6f5e35afe1b2..cd7543e10813 100644
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -5363,6 +5363,155 @@ static int live_lrc_isolation(void *arg)
 	return err;
 }
 
+static int ctx_bb_submit_req(struct intel_context *ce)
+{
+	struct i915_request *rq;
+	int err;
+
+	rq = intel_context_create_request(ce);
+	if (IS_ERR(rq))
+		return PTR_ERR(rq);
+
+	i915_request_get(rq);
+	i915_request_add(rq);
+
+	err = i915_request_wait(rq, 0, HZ / 5);
+	if (err < 0)
+		pr_err("%s: request not completed!\n", rq->engine->name);
+
+	i915_request_put(rq);
+
+	return 0;
+}
+
+#define CTX_BB_CANARY_OFFSET (3*1024)
+#define CTX_BB_CANARY_INDEX  (CTX_BB_CANARY_OFFSET/sizeof(u32))
+
+static u32 *
+emit_ctx_bb_canary(struct intel_context *ce, u32 *cs)
+{
+	const u32 ring_start_reg = i915_mmio_reg_offset(RING_START(0));
+	const u32 srm = MI_STORE_REGISTER_MEM_GEN8 |
+		MI_SRM_LRM_GLOBAL_GTT | MI_LRI_LRM_CS_MMIO;
+
+	*cs++ = srm;
+	*cs++ = ring_start_reg;
+	*cs++ = i915_ggtt_offset(ce->state) +
+		ce->ctx_bb_offset + CTX_BB_CANARY_OFFSET;
+	*cs++ = 0;
+
+	return cs;
+}
+
+static void
+ctx_bb_setup(struct intel_context *ce)
+{
+	u32 *cs = (void *)(ce->lrc_reg_state) -
+		LRC_STATE_PN * PAGE_SIZE + ce->ctx_bb_offset;
+
+	cs[CTX_BB_CANARY_INDEX] = 0xdeadf00d;
+
+	execlists_setup_indirect_ctx_bb(ce, emit_ctx_bb_canary);
+}
+
+static bool check_ring_start(struct intel_context *ce)
+{
+	const u32 * const ctx_bb = (void *)(ce->lrc_reg_state) -
+		LRC_STATE_PN * PAGE_SIZE + ce->ctx_bb_offset;
+
+	if (ctx_bb[CTX_BB_CANARY_INDEX] == ce->lrc_reg_state[CTX_RING_START])
+		return true;
+
+	pr_err("ring start mismatch canary 0x%08x vs state 0x%08x\n",
+	       ctx_bb[CTX_BB_CANARY_INDEX],
+	       ce->lrc_reg_state[CTX_RING_START]);
+
+	return false;
+}
+
+static int ctx_bb_check(struct intel_context *ce)
+{
+	int err;
+
+	err = ctx_bb_submit_req(ce);
+	if (err)
+		return err;
+
+	if (!check_ring_start(ce))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int __per_ctx_bb(struct intel_engine_cs *engine)
+{
+	struct intel_context *ce1, *ce2;
+	int err = 0;
+
+	ce1 = intel_context_create(engine);
+	ce2 = intel_context_create(engine);
+
+	err = intel_context_pin(ce1);
+	if (err)
+		return err;
+
+	err = intel_context_pin(ce2);
+	if (err) {
+		intel_context_put(ce1);
+		return err;
+	}
+
+	if (!ce1->ctx_bb_offset) {
+		GEM_BUG_ON(ce2->ctx_bb_offset);
+		/* must have */
+		GEM_BUG_ON(INTEL_GEN(engine->i915) == 12);
+		goto out;
+	}
+
+	/* make the batch to grab ring start and write it to canary spot */
+	ctx_bb_setup(ce1);
+	ctx_bb_setup(ce2);
+
+	err = ctx_bb_check(ce1);
+	if (err)
+		goto out;
+
+	err = ctx_bb_check(ce2);
+out:
+	intel_context_unpin(ce2);
+	intel_context_put(ce2);
+
+	intel_context_unpin(ce1);
+	intel_context_put(ce1);
+
+	return err;
+}
+
+static int live_lrc_indirect_ctx_bb(void *arg)
+{
+	struct intel_gt *gt = arg;
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+	int err = 0;
+
+	for_each_engine(engine, gt, id) {
+
+		intel_engine_pm_get(engine);
+		err = __per_ctx_bb(engine);
+		intel_engine_pm_put(engine);
+
+		if (err)
+			break;
+
+		if (igt_flush_test(gt->i915)) {
+			err = -EIO;
+			break;
+		}
+	}
+
+	return err;
+}
+
 static void garbage_reset(struct intel_engine_cs *engine,
 			  struct i915_request *rq)
 {
@@ -5594,10 +5743,11 @@ int intel_lrc_live_selftests(struct drm_i915_private *i915)
 		SUBTEST(live_lrc_fixed),
 		SUBTEST(live_lrc_state),
 		SUBTEST(live_lrc_gpr),
-		SUBTEST(live_lrc_isolation),
+		SUBTEST(live_lrc_indirect_ctx_bb),
 		SUBTEST(live_lrc_timestamp),
 		SUBTEST(live_lrc_garbage),
 		SUBTEST(live_pphwsp_runtime),
+		SUBTEST(live_lrc_isolation),
 	};
 
 	if (!HAS_LOGICAL_RING_CONTEXTS(i915))
-- 
2.17.1