[PATCH igt v3 10/11] igt/gem_exec_parse: update registers test for v >= 8

[Robert Bragg <robert@sixbynine.org>]

This combines some parts of the recently added store_lri test with the
registers test to be able to first load a distinguishable value before
the LRI and explicitly read back the register to determine if the
command succeeded or was a NOOP.

For now though we won't look at OACONTROL without checking for version 9
of the command parser.

This updates the 'bad' test to check the OASTATUS2 register so that we
can explicitly read back from the register to check it becomes a NOOP.

This adds a struct test_lri for associating a mask with the init/test
values so we ignore things like hw status bits that might interfere
with the result.

Signed-off-by: Robert Bragg <robert@sixbynine.org>
---
 tests/gem_exec_parse.c | 86 ++++++++++++++++++++++++++------------------------
 1 file changed, 45 insertions(+), 41 deletions(-)

diff --git a/tests/gem_exec_parse.c b/tests/gem_exec_parse.c
index f241ab7..0fa3af8 100644
--- a/tests/gem_exec_parse.c
+++ b/tests/gem_exec_parse.c
@@ -37,6 +37,7 @@
 #define ARRAY_LEN(A) (sizeof(A) / sizeof(A[0]))
 
 #define DERRMR 0x44050
+#define OASTATUS2 0x2368
 #define OACONTROL 0x2360
 #define SO_WRITE_OFFSET_0 0x5280
 
@@ -250,27 +251,35 @@ static void exec_batch_chained(int fd, uint32_t cmd_bo, uint32_t *cmds,
 	gem_close(fd, target_bo);
 }
 
-static void stray_lri(int fd, uint32_t handle)
+/* Be careful to take into account what register bits we can store and read
+ * from...
+ */
+struct test_lri {
+	uint32_t reg, read_mask, init_val, test_val;
+};
+
+static void
+test_lri(int fd, uint32_t handle,
+	 struct test_lri *test, int expected_errno, uint32_t expect)
 {
-	/* Ideally this would test all once whitelisted registers */
 	uint32_t lri[] = {
 		MI_LOAD_REGISTER_IMM,
-		OACONTROL,
-		0x31337000,
+		test->reg,
+		test->test_val,
 		MI_BATCH_BUFFER_END,
 	};
-	int err;
-
-	igt_assert_eq_u32(intel_register_read(OACONTROL), 0xdeadbeef);
 
-	err = __exec_batch(fd, handle, lri, sizeof(lri), I915_EXEC_RENDER);
-	if (err == -EINVAL)
-		return;
+	intel_register_write(test->reg, test->init_val);
 
-	igt_assert_eq(err, 0);
+	exec_batch(fd, handle,
+		   lri, sizeof(lri),
+		   I915_EXEC_RENDER,
+		   expected_errno);
 	gem_sync(fd, handle);
 
-	igt_assert_eq_u32(intel_register_read(OACONTROL), 0xdeadbeef);
+	igt_assert_eq_u32((intel_register_read(test->reg) &
+			   test->read_mask),
+			  expect);
 }
 
 static void hsw_load_register_reg(void)
@@ -441,43 +450,38 @@ igt_main
 	igt_subtest_group {
 		igt_fixture {
 			intel_register_access_init(intel_get_pci_device(), 0);
-
-			intel_register_write(OACONTROL, 0xdeadbeef);
-			igt_assert_eq_u32(intel_register_read(OACONTROL), 0xdeadbeef);
 		}
 
-		igt_subtest("basic-stray-lri")
-			stray_lri(fd, handle);
+		igt_subtest("registers") {
+			struct test_lri bad_lris[] = {
+				/* dummy head pointer */
+				{ OASTATUS2, 0xffffff80, 0xdeadf000, 0xbeeff000 }
+			};
+			struct test_lri ok_lris[] = {
+				/* NB: [1:0] MBZ */
+				{ SO_WRITE_OFFSET_0, 0xfffffffc,
+				  0xabcdabc0, 0xbeefbee0 }
+			};
+			int bad_lri_errno = parser_version >= 8 ? 0 : -EINVAL;
+
+			for (int i = 0; i < ARRAY_LEN(ok_lris); i++) {
+				test_lri(fd, handle,
+					 ok_lris + i, 0,
+					 ok_lris[i].test_val);
+			}
+
+			for (int i = 0; i < ARRAY_LEN(bad_lris); i++) {
+				test_lri(fd, handle,
+					 bad_lris + i, bad_lri_errno,
+					 bad_lris[i].init_val);
+			}
+		}
 
 		igt_fixture {
-			intel_register_write(OACONTROL, 0);
 			intel_register_access_fini();
 		}
 	}
 
-	igt_subtest("registers") {
-		uint32_t lri_bad[] = {
-			MI_LOAD_REGISTER_IMM,
-			0, /* disallowed register address */
-			0x12000000,
-			MI_BATCH_BUFFER_END,
-		};
-		uint32_t lri_ok[] = {
-			MI_LOAD_REGISTER_IMM,
-			0x5280, /* allowed register address (SO_WRITE_OFFSET[0]) */
-			0x1,
-			MI_BATCH_BUFFER_END,
-		};
-		exec_batch(fd, handle,
-			   lri_bad, sizeof(lri_bad),
-			   I915_EXEC_RENDER,
-			   -EINVAL);
-		exec_batch(fd, handle,
-			   lri_ok, sizeof(lri_ok),
-			   I915_EXEC_RENDER,
-			   0);
-	}
-
 	igt_subtest("bitmasks") {
 		uint32_t pc[] = {
 			GFX_OP_PIPE_CONTROL,
-- 
2.10.1

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