[Intel-gfx] [PATCH i-g-t 07/11] tests/i915/i915_hangman: Add alive-ness test after error capture

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

Added a an extra step to the i915_hangman tests to check that the
system is still alive after the hang and recovery. This submits a
simple batch to each engine which does a write to memory and checks
that the write occurred.

Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 tests/i915/i915_hangman.c | 115 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)

diff --git a/tests/i915/i915_hangman.c b/tests/i915/i915_hangman.c
index b77705206..20653b479 100644
--- a/tests/i915/i915_hangman.c
+++ b/tests/i915/i915_hangman.c
@@ -47,8 +47,113 @@
 static int device = -1;
 static int sysfs = -1;
 
+#define OFFSET_ALIVE	10
+
 IGT_TEST_DESCRIPTION("Tests for hang detection and recovery");
 
+/* Requires master for STORE_DWORD on gen4/5 */
+static void store(int fd, const struct intel_execution_engine2 *e,
+		  int fence, uint32_t target, unsigned offset_value)
+{
+	const int SCRATCH = 0;
+	const int BATCH = 1;
+	const int gen = intel_gen(intel_get_drm_devid(fd));
+	struct drm_i915_gem_exec_object2 obj[2];
+	struct drm_i915_gem_relocation_entry reloc;
+	struct drm_i915_gem_execbuffer2 execbuf;
+	uint32_t batch[16];
+	int i;
+
+	memset(&execbuf, 0, sizeof(execbuf));
+	execbuf.buffers_ptr = to_user_pointer(obj);
+	execbuf.buffer_count = ARRAY_SIZE(obj);
+	execbuf.flags = e->flags;
+	if (fence != -1) {
+		execbuf.flags |= I915_EXEC_FENCE_IN;
+		execbuf.rsvd2 = fence;
+	}
+	if (gen < 6)
+		execbuf.flags |= I915_EXEC_SECURE;
+
+	memset(obj, 0, sizeof(obj));
+	obj[SCRATCH].handle = target;
+
+	obj[BATCH].handle = gem_create(fd, 4096);
+	obj[BATCH].relocs_ptr = to_user_pointer(&reloc);
+	obj[BATCH].relocation_count = 1;
+	memset(&reloc, 0, sizeof(reloc));
+
+	i = 0;
+	reloc.target_handle = obj[SCRATCH].handle;
+	reloc.presumed_offset = -1;
+	reloc.offset = sizeof(uint32_t) * (i + 1);
+	reloc.delta = sizeof(uint32_t) * offset_value;
+	reloc.read_domains = I915_GEM_DOMAIN_INSTRUCTION;
+	reloc.write_domain = I915_GEM_DOMAIN_INSTRUCTION;
+	batch[i] = MI_STORE_DWORD_IMM | (gen < 6 ? 1 << 22 : 0);
+	if (gen >= 8) {
+		batch[++i] = reloc.delta;
+		batch[++i] = 0;
+	} else if (gen >= 4) {
+		batch[++i] = 0;
+		batch[++i] = reloc.delta;
+		reloc.offset += sizeof(uint32_t);
+	} else {
+		batch[i]--;
+		batch[++i] = reloc.delta;
+	}
+	batch[++i] = offset_value;
+	batch[++i] = MI_BATCH_BUFFER_END;
+	gem_write(fd, obj[BATCH].handle, 0, batch, sizeof(batch));
+	gem_execbuf(fd, &execbuf);
+	gem_close(fd, obj[BATCH].handle);
+}
+
+static void check_alive(void)
+{
+	const struct intel_execution_engine2 *engine;
+	const intel_ctx_t *ctx;
+	uint32_t scratch, *out;
+	int fd, i = 0;
+	uint64_t ahnd;
+
+	fd = drm_open_driver(DRIVER_INTEL);
+	igt_require(gem_class_can_store_dword(fd, 0));
+
+	ctx = intel_ctx_create_all_physical(fd);
+	ahnd = get_reloc_ahnd(fd, ctx->id);
+	scratch = gem_create(fd, 4096);
+	out = gem_mmap__wc(fd, scratch, 0, 4096, PROT_WRITE);
+	gem_set_domain(fd, scratch,
+			I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
+
+	for_each_physical_engine(fd, engine) {
+		igt_assert_eq_u32(out[i + OFFSET_ALIVE], 0);
+		i++;
+	}
+
+	i = 0;
+	for_each_ctx_engine(fd, ctx, engine) {
+		if (!gem_class_can_store_dword(fd, engine->class))
+			continue;
+
+		/* +OFFSET_ALIVE to ensure engine zero doesn't get a false negative */
+		store(fd, engine, -1, scratch, i + OFFSET_ALIVE);
+		i++;
+	}
+
+	gem_set_domain(fd, scratch, I915_GEM_DOMAIN_GTT, 0);
+
+	while (i--)
+		igt_assert_eq_u32(out[i + OFFSET_ALIVE], i + OFFSET_ALIVE);
+
+	munmap(out, 4096);
+	gem_close(fd, scratch);
+	put_ahnd(ahnd);
+	intel_ctx_destroy(fd, ctx);
+	close(fd);
+}
+
 static bool has_error_state(int dir)
 {
 	bool result;
@@ -230,6 +335,8 @@ static void test_error_state_capture(const intel_ctx_t *ctx,
 	check_error_state(e->name, offset, batch);
 	munmap(batch, 4096);
 	put_ahnd(ahnd);
+
+	check_alive();
 }
 
 static void
@@ -288,6 +395,8 @@ test_engine_hang(const intel_ctx_t *ctx,
 		put_ahnd(ahndN);
 	}
 	put_ahnd(ahnd);
+
+	check_alive();
 }
 
 static int hang_count;
@@ -320,6 +429,8 @@ static void test_hang_detector(const intel_ctx_t *ctx,
 
 	/* Did it work? */
 	igt_assert(hang_count == 1);
+
+	check_alive();
 }
 
 /* This test covers the case where we end up in an uninitialised area of the
@@ -355,6 +466,8 @@ static void hangcheck_unterminated(const intel_ctx_t *ctx)
 		igt_force_gpu_reset(device);
 		igt_assert_f(0, "unterminated batch did not trigger a hang!");
 	}
+
+	check_alive();
 }
 
 static void do_tests(const char *name, const char *prefix,
@@ -432,6 +545,8 @@ igt_main
 		igt_assert(sysfs != -1);
 
 		igt_require(has_error_state(sysfs));
+
+		gem_require_mmap_wc(device);
 	}
 
 	igt_describe("Basic error capture");
-- 
2.25.1