[igt-dev] [PATCH 2/2] i915/perf: Sanity check reports in mapped OA buffer

Umesh Nerlige Ramappa umesh.nerlige.ramappa at intel.com
Fri Jul 17 23:58:42 UTC 2020


For applications that need a faster way to access reports in the OA
buffer, i915 now provides a way to map the OA buffer to privileged user
space. Add a test to sanity check reports in the mapped OA buffer.

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
---
 include/drm-uapi/i915_drm.h |  32 ++++++++++
 tests/i915/perf.c           | 113 ++++++++++++++++++++++++++++++++++++
 2 files changed, 145 insertions(+)

diff --git a/include/drm-uapi/i915_drm.h b/include/drm-uapi/i915_drm.h
index 2b55af13..f7523d55 100644
--- a/include/drm-uapi/i915_drm.h
+++ b/include/drm-uapi/i915_drm.h
@@ -2048,6 +2048,38 @@ struct drm_i915_perf_open_param {
  */
 #define I915_PERF_IOCTL_CONFIG	_IO('i', 0x2)
 
+/**
+ * Returns OA buffer properties to be used with mmap.
+ *
+ * This ioctl is available in perf revision 6.
+ */
+#define I915_PERF_IOCTL_GET_OA_BUFFER_INFO _IO('i', 0x3)
+
+/**
+ * OA buffer size and offset.
+ */
+struct drm_i915_perf_oa_buffer_info {
+	__u32 size;
+	__u32 offset;
+	__u64 reserved[4];
+};
+
+/**
+ * Returns current position of OA buffer head and tail.
+ *
+ * This ioctl is available in perf revision 6.
+ */
+#define I915_PERF_IOCTL_GET_OA_BUFFER_HEAD_TAIL _IO('i', 0x4)
+
+/**
+ * OA buffer head and tail.
+ */
+struct drm_i915_perf_oa_buffer_head_tail {
+	__u32 head;
+	__u32 tail;
+	__u64 reserved[4];
+};
+
 /**
  * Common to all i915 perf records
  */
diff --git a/tests/i915/perf.c b/tests/i915/perf.c
index eb38ea12..a02896e5 100644
--- a/tests/i915/perf.c
+++ b/tests/i915/perf.c
@@ -206,6 +206,7 @@ static struct intel_perf *intel_perf = NULL;
 static struct intel_perf_metric_set *test_set = NULL;
 static bool *undefined_a_counters;
 static uint64_t oa_exp_1_millisec;
+struct intel_mmio_data mmio_data;
 
 static igt_render_copyfunc_t render_copy = NULL;
 static uint32_t (*read_report_ticks)(uint32_t *report,
@@ -5011,6 +5012,108 @@ test_whitelisted_registers_userspace_config(void)
 	i915_perf_remove_config(drm_fd, config_id);
 }
 
+#define OA_BUFFER_DATA(tail, head, oa_buffer_size) \
+	(((tail) - (head)) & ((oa_buffer_size) - 1))
+
+static uint32_t oa_status_reg(void)
+{
+	if (IS_HASWELL(devid))
+		return intel_register_read(&mmio_data, 0x2346) & 0x7;
+	else if (IS_GEN12(devid))
+		return intel_register_read(&mmio_data, 0xdafc) & 0x7;
+	else
+		return intel_register_read(&mmio_data, 0x2b08) & 0xf;
+}
+
+static void check_reports_from_mapped_buffer(enum drm_i915_oa_format fmt,
+					     int oa_exponent)
+{
+	struct drm_i915_perf_oa_buffer_info oa_buffer;
+	struct drm_i915_perf_oa_buffer_head_tail oa_ht;
+	struct oa_format format = get_oa_format(fmt);
+	size_t report_size = format.size;
+	uint8_t *reports;
+	uint32_t *report0, *report1;
+	uint32_t num_reports, timer_reports = 0;
+	uint32_t period_us = oa_exponent_to_ns(oa_exponent) / 1000;
+	void *oa_vaddr;
+	int i;
+
+	do_ioctl(stream_fd, I915_PERF_IOCTL_GET_OA_BUFFER_INFO, &oa_buffer);
+
+	igt_debug("size        = %d\n", oa_buffer.size);
+	igt_debug("offset      = %x\n", oa_buffer.offset);
+
+	igt_assert_eq(oa_buffer.size & (oa_buffer.size - 1), 0);
+	igt_assert_eq(oa_status_reg(), 0);
+
+	/* try a couple invalid mmaps */
+	/* bad offsets */
+	igt_assert(mmap(0, oa_buffer.size, PROT_READ, MAP_PRIVATE,
+			stream_fd, 0) == (void *) -1);
+	igt_assert(mmap(0, oa_buffer.size, PROT_READ, MAP_PRIVATE,
+			stream_fd, 8192) == (void *) -1);
+	igt_assert(mmap(0, oa_buffer.size, PROT_READ, MAP_PRIVATE,
+			stream_fd, 11) == (void *) -1);
+
+	/* bad size */
+	igt_assert(mmap(0, oa_buffer.size + 4096, PROT_READ, MAP_PRIVATE,
+			stream_fd, oa_buffer.offset) == (void *) -1);
+
+	/* do the right thing */
+	oa_vaddr = mmap(0, oa_buffer.size, PROT_READ, MAP_PRIVATE, stream_fd, oa_buffer.offset);
+
+	/* wait for approx 100 reports */
+	usleep(100 * period_us);
+
+	do_ioctl(stream_fd, I915_PERF_IOCTL_GET_OA_BUFFER_HEAD_TAIL, &oa_ht);
+
+	igt_debug("head = %x\n", oa_ht.head);
+	igt_debug("tail = %x\n", oa_ht.tail);
+
+	reports = (uint8_t *) (oa_vaddr + oa_ht.head);
+
+	num_reports = OA_BUFFER_DATA(oa_ht.tail,
+				     oa_ht.head,
+				     oa_buffer.size) / report_size;
+
+	for (i = 0; i < num_reports; i++) {
+		report1 = (uint32_t *)(reports + (i * report_size));
+		if (!oa_report_is_periodic(oa_exponent, report1))
+			continue;
+
+		timer_reports++;
+		if (timer_reports >= 2)
+			sanity_check_reports(report0, report1, fmt);
+
+		report0 = report1;
+	}
+
+	munmap(oa_vaddr, oa_buffer.size);
+}
+
+static void test_mapped_oa_buffer(void)
+{
+	int oa_exponent = max_oa_exponent_for_period_lte(1000000);
+	enum drm_i915_oa_format fmt = test_set->perf_oa_format;
+	uint64_t properties[] = {
+		DRM_I915_PERF_PROP_SAMPLE_OA, true,
+		DRM_I915_PERF_PROP_OA_METRICS_SET, test_set->perf_oa_metrics_set,
+		DRM_I915_PERF_PROP_OA_FORMAT, fmt,
+		DRM_I915_PERF_PROP_OA_EXPONENT, oa_exponent,
+
+	};
+	struct drm_i915_perf_open_param param = {
+		.flags = I915_PERF_FLAG_FD_CLOEXEC,
+		.num_properties = sizeof(properties) / 16,
+		.properties_ptr = to_user_pointer(properties),
+	};
+
+	stream_fd = __perf_open(drm_fd, &param, false);
+	check_reports_from_mapped_buffer(fmt, oa_exponent);
+	__perf_close(stream_fd);
+}
+
 static unsigned
 read_i915_module_ref(void)
 {
@@ -5179,6 +5282,9 @@ igt_main
 
 		render_copy = igt_get_render_copyfunc(devid);
 		igt_require_f(render_copy, "no render-copy function\n");
+
+		intel_register_access_init(&mmio_data, intel_get_pci_device(),
+					   0, drm_fd);
 	}
 
 	igt_subtest("non-system-wide-paranoid")
@@ -5346,6 +5452,12 @@ igt_main
 		test_triggered_oa_reports();
 	}
 
+	igt_describe("Verify mapping of oa buffer");
+	igt_subtest("mapped-oa-buffer") {
+		igt_require(i915_perf_revision(drm_fd) >= 8);
+		test_mapped_oa_buffer();
+	}
+
 	igt_fixture {
 		/* leave sysctl options in their default state... */
 		write_u64_file("/proc/sys/dev/i915/oa_max_sample_rate", 100000);
@@ -5354,6 +5466,7 @@ igt_main
 		if (intel_perf)
 			intel_perf_free(intel_perf);
 
+		intel_register_access_fini(&mmio_data);
 		close(drm_fd);
 	}
 }
-- 
2.20.1



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