Signed-off-by: Robert Bragg <robert@xxxxxxxxxxxxx>
Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>
---
tests/Makefile.sources | 1 +
tests/perf.c | 2373 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 2374 insertions(+)
create mode 100644 tests/perf.c
diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 65e0792..a818963 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -214,6 +214,7 @@ TESTS_progs = \
kms_pwrite_crc \
kms_sink_crc_basic \
prime_udl \
+ perf \
$(NULL)
# IMPORTANT: The ZZ_ tests need to be run last!
diff --git a/tests/perf.c b/tests/perf.c
new file mode 100644
index 0000000..1aafca9
--- /dev/null
+++ b/tests/perf.c
@@ -0,0 +1,2373 @@
+/*
+ * 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 <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/times.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <time.h>
+#include <poll.h>
+#include <math.h>
+
+#include "igt.h"
+#include "drm.h"
+
+IGT_TEST_DESCRIPTION("Test the i915 perf metrics streaming interface");
+
+#define GEN6_MI_REPORT_PERF_COUNT ((0x28 << 23) | (3 - 2))
+
+#define GFX_OP_PIPE_CONTROL ((3 << 29) | (3 << 27) | (2 << 24))
+#define PIPE_CONTROL_CS_STALL (1 << 20)
+#define PIPE_CONTROL_GLOBAL_SNAPSHOT_COUNT_RESET (1 << 19)
+#define PIPE_CONTROL_TLB_INVALIDATE (1 << 18)
+#define PIPE_CONTROL_SYNC_GFDT (1 << 17)
+#define PIPE_CONTROL_MEDIA_STATE_CLEAR (1 << 16)
+#define PIPE_CONTROL_NO_WRITE (0 << 14)
+#define PIPE_CONTROL_WRITE_IMMEDIATE (1 << 14)
+#define PIPE_CONTROL_WRITE_DEPTH_COUNT (2 << 14)
+#define PIPE_CONTROL_WRITE_TIMESTAMP (3 << 14)
+#define PIPE_CONTROL_DEPTH_STALL (1 << 13)
+#define PIPE_CONTROL_RENDER_TARGET_FLUSH (1 << 12)
+#define PIPE_CONTROL_INSTRUCTION_INVALIDATE (1 << 11)
+#define PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE (1 << 10) /* GM45+ only */
+#define PIPE_CONTROL_ISP_DIS (1 << 9)
+#define PIPE_CONTROL_INTERRUPT_ENABLE (1 << 8)
+#define PIPE_CONTROL_FLUSH_ENABLE (1 << 7) /* Gen7+ only */
+/* GT */
+#define PIPE_CONTROL_DATA_CACHE_INVALIDATE (1 << 5)
+#define PIPE_CONTROL_VF_CACHE_INVALIDATE (1 << 4)
+#define PIPE_CONTROL_CONST_CACHE_INVALIDATE (1 << 3)
+#define PIPE_CONTROL_STATE_CACHE_INVALIDATE (1 << 2)
+#define PIPE_CONTROL_STALL_AT_SCOREBOARD (1 << 1)
+#define PIPE_CONTROL_DEPTH_CACHE_FLUSH (1 << 0)
+#define PIPE_CONTROL_PPGTT_WRITE (0 << 2)
+#define PIPE_CONTROL_GLOBAL_GTT_WRITE (1 << 2)
+
+#define NSEC_PER_SEC 1000000000ull
+
+/* Temporarily copy i915-perf uapi here to avoid a dependency on libdrm's
+ * i915_drm.h copy being updated with the i915-perf interface before this
+ * test can land in i-g-t.
+ *
+ * TODO: remove this once the interface lands in libdrm
+ */
+#ifndef DRM_I915_PERF_OPEN
+#define DRM_I915_PERF_OPEN 0x36
+#define DRM_IOCTL_I915_PERF_OPEN DRM_IOW(DRM_COMMAND_BASE + DRM_I915_PERF_OPEN, struct drm_i915_perf_open_param)
+
+enum drm_i915_oa_format {
+ I915_OA_FORMAT_A13 = 1,
+ I915_OA_FORMAT_A29,
+ I915_OA_FORMAT_A13_B8_C8,
+ I915_OA_FORMAT_B4_C8,
+ I915_OA_FORMAT_A45_B8_C8,
+ I915_OA_FORMAT_B4_C8_A16,
+ I915_OA_FORMAT_C4_B8,
+
+ I915_OA_FORMAT_MAX /* non-ABI */
+};
+
+enum drm_i915_perf_property_id {
+ DRM_I915_PERF_PROP_CTX_HANDLE = 1,
+ DRM_I915_PERF_PROP_SAMPLE_OA,
+ DRM_I915_PERF_PROP_OA_METRICS_SET,
+ DRM_I915_PERF_PROP_OA_FORMAT,
+ DRM_I915_PERF_PROP_OA_EXPONENT,
+
+ DRM_I915_PERF_PROP_MAX /* non-ABI */
+};
+
+struct drm_i915_perf_open_param {
+ __u32 flags;
+#define I915_PERF_FLAG_FD_CLOEXEC (1<<0)
+#define I915_PERF_FLAG_FD_NONBLOCK (1<<1)
+#define I915_PERF_FLAG_DISABLED (1<<2)
+
+ __u32 num_properties;
+ __u64 properties_ptr;
+};
+
+#define I915_PERF_IOCTL_ENABLE _IO('i', 0x0)
+#define I915_PERF_IOCTL_DISABLE _IO('i', 0x1)
+
+struct drm_i915_perf_record_header {
+ __u32 type;
+ __u16 pad;
+ __u16 size;
+};
+
+enum drm_i915_perf_record_type {
+ DRM_I915_PERF_RECORD_SAMPLE = 1,
+ DRM_I915_PERF_RECORD_OA_REPORT_LOST = 2,
+ DRM_I915_PERF_RECORD_OA_BUFFER_LOST = 3,
+
+ DRM_I915_PERF_RECORD_MAX /* non-ABI */
+};
+#endif /* !DRM_I915_PERF_OPEN */
+
+static struct {
+ const char *name;
+ size_t size;
+ int a_off; /* bytes */
+ int n_a;
+ int first_a;
+ int b_off;
+ int n_b;
+ int c_off;
+ int n_c;
+} oa_formats[I915_OA_FORMAT_MAX] = {
+ [I915_OA_FORMAT_A13] = {
+ "A13", .size = 64,
+ .a_off = 12, .n_a = 13 },
+ [I915_OA_FORMAT_A29] = {
+ "A29", .size = 128,
+ .a_off = 12, .n_a = 29 },
+ [I915_OA_FORMAT_A13_B8_C8] = {
+ "A13_B8_C8", .size = 128,
+ .a_off = 12, .n_a = 13,
+ .b_off = 64, .n_b = 8,
+ .c_off = 96, .n_c = 8 },
+ [I915_OA_FORMAT_A45_B8_C8] = {
+ "A45_B8_C8", .size = 256,
+ .a_off = 12, .n_a = 45,
+ .b_off = 192, .n_b = 8,
+ .c_off = 224, .n_c = 8 },
+ [I915_OA_FORMAT_B4_C8] = {
+ "B4_C8", .size = 64,
+ .b_off = 16, .n_b = 4,
+ .c_off = 32, .n_c = 8 },
+ [I915_OA_FORMAT_B4_C8_A16] = {
+ "B4_C8_A16", .size = 128,
+ .b_off = 16, .n_b = 4,
+ .c_off = 32, .n_c = 8,
+ .a_off = 60, .n_a = 16, .first_a = 29 },
+ [I915_OA_FORMAT_C4_B8] = {
+ "C4_B8", .size = 64,
+ .c_off = 16, .n_c = 4,
+ .b_off = 28, .n_b = 8 },
+};
+
+static bool hsw_undefined_a_counters[45] = {
+ [4] = true,
+ [6] = true,
+ [9] = true,
+ [11] = true,
+ [14] = true,
+ [16] = true,
+ [19] = true,
+ [21] = true,
+ [24] = true,
+ [26] = true,
+ [29] = true,
+ [31] = true,
+ [34] = true,
+ [43] = true,
+ [44] = true,
+};
+
+static int drm_fd = -1;
+static uint32_t devid;
+static int device = -1;
+
+static uint64_t hsw_render_basic_id = UINT64_MAX;
+static uint64_t gt_min_freq_mhz_saved = 0;
+static uint64_t gt_max_freq_mhz_saved = 0;
+static uint64_t gt_min_freq_mhz = 0;
+static uint64_t gt_max_freq_mhz = 0;
+
+static uint64_t timestamp_frequency = 12500000;
+
+static igt_render_copyfunc_t render_copy = NULL;
+
+static int
+__perf_open(int fd, struct drm_i915_perf_open_param *param)
+{
+ int ret = igt_ioctl(fd, DRM_IOCTL_I915_PERF_OPEN, param);
+
+ igt_assert(ret >= 0);
+ errno = 0;
+
+ return ret;
+}
+
+static int
+lookup_format(int i915_perf_fmt_id)
+{
+ igt_assert(i915_perf_fmt_id < I915_OA_FORMAT_MAX);
+ igt_assert(oa_formats[i915_perf_fmt_id].name);
+
+ return i915_perf_fmt_id;
+}
+
+static bool
+try_read_u64_file(const char *file, uint64_t *val)
+{
+ char buf[32];
+ int fd, n;
+
+ fd = open(file, O_RDONLY);
+ if (fd < 0)
+ return false;
+
+ while ((n = read(fd, buf, sizeof(buf) - 1)) < 0 && errno == EINTR)
+ ;
+ igt_assert(n >= 0);
+
+ close(fd);
+
+ buf[n] = '\0';
+ *val = strtoull(buf, NULL, 0);
+
+ return true;
+}
+
+static uint64_t
+read_u64_file(const char *file)
+{
+ uint64_t val;
+
+ igt_assert_eq(try_read_u64_file(file, &val), true);
+
+ return val;
+}
+
+static void
+write_u64_file(const char *file, uint64_t val)
+{
+ char buf[32];
+ int fd, len, ret;
+
+ fd = open(file, O_WRONLY);
+ igt_assert(fd >= 0);
+
+ len = snprintf(buf, sizeof(buf), "%"PRIu64, val);
+ igt_assert(len > 0);
+
+ while ((ret = write(fd, buf, len)) < 0 && errno == EINTR)
+ ;
+ igt_assert_eq(ret, len);
+
+ close(fd);
+}
+
+static uint64_t
+sysfs_read(const char *file)
+{
+ char buf[512];
+
+ snprintf(buf, sizeof(buf), "/sys/class/drm/card%d/%s", device, file);
+
+ return read_u64_file(buf);
+}
+
+static void
+sysfs_write(const char *file, uint64_t val)
+{
+ char buf[512];
+
+ snprintf(buf, sizeof(buf), "/sys/class/drm/card%d/%s", device, file);
+
+ write_u64_file(buf, val);
+}
+
+static char *
+read_debugfs_record(const char *file, const char *key)
+{
+ FILE *fp;
+ char *line = NULL;
+ size_t line_buf_size = 0;
+ int len = 0;
+ int key_len = strlen(key);
+ char *value = NULL;
+
+ fp = igt_debugfs_fopen(file, "r");
+ igt_require(fp);
+
+ while ((len = getline(&line, &line_buf_size, fp)) > 0) {
+
+ if (line[len - 1] == '\n')
+ line[len - 1] = '\0';
+
+ if (strncmp(key, line, key_len) == 0 &&
+ line[key_len] == ':' &&
+ line[key_len + 1] == ' ')
+ {
+ value = strdup(line + key_len + 2);
+ goto done;
+ }
+ }
+
+ igt_assert(!"reached");
+done:
+ free(line);
+ if (fp)
+ fclose(fp);
+ return value;
+}
+
+static uint64_t
+read_debugfs_u64_record(const char *file, const char *key)
+{
+ char *str_val = read_debugfs_record(file, key);
+ uint64_t val;
+
+ igt_require(str_val);
+
+ val = strtoull(str_val, NULL, 0);
+ free(str_val);
+
+ return val;
+}
+
+static bool
+lookup_hsw_render_basic_id(void)
+{
+ char buf[256];
+
+ igt_assert_neq(device, -1);
+
+ snprintf(buf, sizeof(buf),
+ "/sys/class/drm/card%d/metrics/403d8832-1a27-4aa6-a64e-f5389ce7b212/id",
+ device);
+
+ return try_read_u64_file(buf, &hsw_render_basic_id);
+}
+
+static void
+gt_frequency_range_save(void)
+{
+ gt_min_freq_mhz_saved = sysfs_read("gt_min_freq_mhz");
+ gt_max_freq_mhz_saved = sysfs_read("gt_max_freq_mhz");
+
+ gt_min_freq_mhz = gt_min_freq_mhz_saved;
+ gt_max_freq_mhz = gt_max_freq_mhz_saved;
+}
+
+static void
+gt_frequency_pin(int gt_freq_mhz)
+{
+ igt_debug("requesting pinned GT freq = %dmhz\n", gt_freq_mhz);
+
+ if (gt_freq_mhz > gt_max_freq_mhz) {
+ sysfs_write("gt_max_freq_mhz", gt_freq_mhz);
+ sysfs_write("gt_min_freq_mhz", gt_freq_mhz);
+ } else {
+ sysfs_write("gt_min_freq_mhz", gt_freq_mhz);
+ sysfs_write("gt_max_freq_mhz", gt_freq_mhz);
+ }
+ gt_min_freq_mhz = gt_freq_mhz;
+ gt_max_freq_mhz = gt_freq_mhz;
+}
+
+static void
+gt_frequency_range_restore(void)
+{
+ igt_debug("restoring GT frequency range: min = %dmhz, max =%dmhz, current: min=%dmhz, max=%dmhz\n",
+ (int)gt_min_freq_mhz_saved,
+ (int)gt_max_freq_mhz_saved,
+ (int)gt_min_freq_mhz,
+ (int)gt_max_freq_mhz);
+
+ /* Assume current min/max are the same */
+ if (gt_min_freq_mhz_saved > gt_max_freq_mhz) {
+ sysfs_write("gt_max_freq_mhz", gt_max_freq_mhz_saved);
+ sysfs_write("gt_min_freq_mhz", gt_min_freq_mhz_saved);
+ } else {
+ sysfs_write("gt_min_freq_mhz", gt_min_freq_mhz_saved);
+ sysfs_write("gt_max_freq_mhz", gt_max_freq_mhz_saved);
+ }
+
+ gt_min_freq_mhz = gt_min_freq_mhz_saved;
+ gt_max_freq_mhz = gt_max_freq_mhz_saved;
+}
+
+static uint64_t
+timebase_scale(uint32_t u32_delta)
+{
+ return ((uint64_t)u32_delta * NSEC_PER_SEC) / timestamp_frequency;
+}
+
+/* CAP_SYS_ADMIN is required to open system wide metrics, unless the system
+ * control parameter dev.i915.perf_stream_paranoid == 0 */
+static void
+test_system_wide_paranoid(void)
+{
+ igt_fork(child, 1) {
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ DRM_I915_PERF_PROP_OA_EXPONENT, 13, /* 1 millisecond */
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC |
+ I915_PERF_FLAG_FD_NONBLOCK,
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+
+ write_u64_file("/proc/sys/dev/i915/perf_stream_paranoid", 1);
+
+ igt_drop_root();
+
+ do_ioctl_err(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m, EACCES);
+ }
+
+ igt_waitchildren();
+
+ igt_fork(child, 1) {
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ DRM_I915_PERF_PROP_OA_EXPONENT, 13, /* 1 millisecond */
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC |
+ I915_PERF_FLAG_FD_NONBLOCK,
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+ int stream_fd;
+
+ write_u64_file("/proc/sys/dev/i915/perf_stream_paranoid", 0);
+
+ igt_drop_root();
+
+ stream_fd = __perf_open(drm_fd, ¶m);
+ close(stream_fd);
+ }
+
+ igt_waitchildren();
+
+ /* leave in paranoid state */
+ write_u64_file("/proc/sys/dev/i915/perf_stream_paranoid", 1);
+}
+
+static void
+test_invalid_open_flags(void)
+{
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ DRM_I915_PERF_PROP_OA_EXPONENT, 13, /* 1 millisecond */
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = ~0, /* Undefined flag bits set! */
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+
+ do_ioctl_err(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m, EINVAL);
+}
+
+static void
+test_invalid_oa_metric_set_id(void)
+{
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ DRM_I915_PERF_PROP_OA_EXPONENT, 13, /* 1 millisecond */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, UINT64_MAX,
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC |
+ I915_PERF_FLAG_FD_NONBLOCK,
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+ int stream_fd;
+
+ do_ioctl_err(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m, EINVAL);
+
+ properties[ARRAY_SIZE(properties) - 1] = 0; /* ID 0 is also be reserved as invalid */
+ do_ioctl_err(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m, EINVAL);
+
+ /* Check that we aren't just seeing false positives... */
+ properties[ARRAY_SIZE(properties) - 1] = hsw_render_basic_id;
+ stream_fd = __perf_open(drm_fd, ¶m);
+ close(stream_fd);
+
+ /* There's no valid default OA metric set ID... */
+ param.num_properties--;
+ do_ioctl_err(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m, EINVAL);
+}
+
+static void
+test_invalid_oa_format_id(void)
+{
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_EXPONENT, 13, /* 1 millisecond */
+ DRM_I915_PERF_PROP_OA_FORMAT, UINT64_MAX,
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC |
+ I915_PERF_FLAG_FD_NONBLOCK,
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+ int stream_fd;
+
+ do_ioctl_err(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m, EINVAL);
+
+ properties[ARRAY_SIZE(properties) - 1] = 0; /* ID 0 is also be reserved as invalid */
+ do_ioctl_err(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m, EINVAL);
+
+ /* Check that we aren't just seeing false positives... */
+ properties[ARRAY_SIZE(properties) - 1] = I915_OA_FORMAT_A45_B8_C8;
+ stream_fd = __perf_open(drm_fd, ¶m);
+ close(stream_fd);
+
+ /* There's no valid default OA format... */
+ param.num_properties--;
+ do_ioctl_err(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m, EINVAL);
+}
+
+static void
+test_missing_sample_flags(void)
+{
+ uint64_t properties[] = {
+ /* No _PROP_SAMPLE_xyz flags */
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_EXPONENT, 13, /* 1 millisecond */
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC,
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+
+ do_ioctl_err(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m, EINVAL);
+}
+
+static void
+read_2_oa_reports(int stream_fd,
+ int format_id,
+ int exponent,
+ uint32_t *oa_report0,
+ uint32_t *oa_report1,
+ bool timer_only)
+{
+ size_t format_size = oa_formats[format_id].size;
+ size_t sample_size = (sizeof(struct drm_i915_perf_record_header) +
+ format_size);
+ const struct drm_i915_perf_record_header *header;
+ uint32_t exponent_mask = (1 << (exponent + 1)) - 1;
+
+ /* Note: we allocate a large buffer so that each read() iteration
+ * should scrape *all* pending records.
+ *
+ * The largest buffer the OA unit supports is 16MB and the smallest
+ * OA report format is 64bytes allowing up to 262144 reports to
+ * be buffered.
+ *
+ * Being sure we are fetching all buffered reports allows us to
+ * potentially throw away / skip all reports whenever we see
+ * a _REPORT_LOST notification as a way of being sure are
+ * measurements aren't skewed by a lost report.
+ *
+ * Note: that is is useful for some tests but also not something
+ * applications would be expected to resort to. Lost reports are
+ * somewhat unpredictable but typically don't pose a problem - except
+ * to indicate that the OA unit may be over taxed if lots of reports
+ * are being lost.
+ */
+ int buf_size = 262144 * (64 + sizeof(struct drm_i915_perf_record_header));
+ uint8_t *buf = malloc(buf_size);
+ int n = 0;
+
+ for (int i = 0; i < 1000; i++) {
+ ssize_t len;
+
+ while ((len = read(stream_fd, buf, buf_size)) < 0 &&
+ errno == EINTR)
+ ;
+
+ igt_assert(len > 0);
+
+ for (size_t offset = 0; offset < len; offset += header->size) {
+ const uint32_t *report;
+
+ header = (void *)(buf + offset);
+
+ igt_assert_eq(header->pad, 0); /* Reserved */
+
+ /* Currently the only test that should ever expect to
+ * see a _BUFFER_LOST error is the buffer_fill test,
+ * otherwise something bad has probably happened...
+ */
+ igt_assert_neq(header->type, DRM_I915_PERF_RECORD_OA_BUFFER_LOST);
+
+ /* At high sampling frequencies the OA HW might not be
+ * able to cope with all write requests and will notify
+ * us that a report was lost. We restart our read of
+ * two sequential reports due to the timeline blip this
+ * implies
+ */
+ if (header->type == DRM_I915_PERF_RECORD_OA_REPORT_LOST) {
+ igt_debug("read restart: OA trigger collision / report lost\n");
+ n = 0;
+
+ /* XXX: break, because we don't know where
+ * within the series of already read reports
+ * there could be a blip from the lost report.
+ */
+ break;
+ }
+
+ /* Currently the only other record type expected is a
+ * _SAMPLE. Notably this test will need updating if
+ * i915-perf is extended in the future with additional
+ * record types.
+ */
+ igt_assert_eq(header->type, DRM_I915_PERF_RECORD_SAMPLE);
+
+ igt_assert_eq(header->size, sample_size);
+
+ report = (const void *)(header + 1);
+
+ igt_debug("read report: reason = %x, timestamp = %x, exponent mask=%x\n",
+ report[0], report[1], exponent_mask);
+
+ /* Don't expect zero for timestamps */
+ igt_assert_neq(report[1], 0);
+
+ if (timer_only) {
+ /* For Haswell we don't have a documented
+ * report reason field (though empirically
+ * report[0] bit 10 does seem to correlate with
+ * a timer trigger reason) so we instead infer
+ * which reports are timer triggered by
+ * checking if the least significant bits are
+ * zero and the exponent bit is set.
+ */
+ if ((report[1] & exponent_mask) != (1 << exponent)) {
+ igt_debug("skipping non timer report reason=%x\n",
+ report[0]);
+
+ /* Also assert our hypothesis about the
+ * reason bit...
+ */
+ igt_assert_eq(report[0] & (1 << 10), 0);
+ continue;
+ }
+ }
+
+ if (n++ == 0)
+ memcpy(oa_report0, report, format_size);
+ else {
+ memcpy(oa_report1, report, format_size);
+ free(buf);
+ return;
+ }
+ }
+ }
+
+ free(buf);
+
+ igt_assert(!"reached");
+}
+
+static void
+open_and_read_2_oa_reports(int format_id,
+ int exponent,
+ uint32_t *oa_report0,
+ uint32_t *oa_report1,
+ bool timer_only)
+{
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, format_id,
+ DRM_I915_PERF_PROP_OA_EXPONENT, exponent,
+
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC,
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+ int stream_fd = __perf_open(drm_fd, ¶m);
+
+ read_2_oa_reports(stream_fd, format_id, exponent,
+ oa_report0, oa_report1, timer_only);
+
+ close(stream_fd);
+}
+
+static void
+print_reports(uint32_t *oa_report0, uint32_t *oa_report1, int fmt)
+{
+ uint32_t *a0, *b0, *c0;
+ uint32_t *a1, *b1, *c1;
+
+ /* Not ideal naming here with a0 or a1
+ * differentiating report0 or 1 not A counter 0 or 1....
+ */
+ a0 = (uint32_t *)(((uint8_t *)oa_report0) + oa_formats[fmt].a_off);
+ b0 = (uint32_t *)(((uint8_t *)oa_report0) + oa_formats[fmt].b_off);
+ c0 = (uint32_t *)(((uint8_t *)oa_report0) + oa_formats[fmt].c_off);
+
+ a1 = (uint32_t *)(((uint8_t *)oa_report1) + oa_formats[fmt].a_off);
+ b1 = (uint32_t *)(((uint8_t *)oa_report1) + oa_formats[fmt].b_off);
+ c1 = (uint32_t *)(((uint8_t *)oa_report1) + oa_formats[fmt].c_off);
+
+ igt_debug("TIMESTAMP: 1st = %"PRIu32", 2nd = %"PRIu32", delta = %"PRIu32"\n",
+ oa_report0[1], oa_report1[1], oa_report1[1] - oa_report0[1]);
+
+ if (oa_formats[fmt].n_c) {
+ igt_debug("CLOCK: 1st = %"PRIu32", 2nd = %"PRIu32", delta = %"PRIu32"\n",
+ c0[2], c1[2], c1[2] - c0[2]);
+ } else
+ igt_debug("CLOCK = N/A\n");
+
+ for (int j = oa_formats[fmt].first_a;
+ j < oa_formats[fmt].n_a;
+ j++)
+ {
+ uint32_t delta = a1[j] - a0[j];
+
+ if (hsw_undefined_a_counters[j])
+ continue;
+
+ igt_debug("A%d: 1st = %"PRIu32", 2nd = %"PRIu32", delta = %"PRIu32"\n",
+ j, a0[j], a1[j], delta);
+ }
+
+ for (int j = 0; j < oa_formats[fmt].n_b; j++) {
+ uint32_t delta = b1[j] - b0[j];
+ igt_debug("B%d: 1st = %"PRIu32", 2nd = %"PRIu32", delta = %"PRIu32"\n",
+ j, b0[j], b1[j], delta);
+ }
+
+ for (int j = 0; j < oa_formats[fmt].n_c; j++) {
+ uint32_t delta = c1[j] - c0[j];
+ igt_debug("C%d: 1st = %"PRIu32", 2nd = %"PRIu32", delta = %"PRIu32"\n",
+ j, c0[j], c1[j], delta);
+ }
+}
+
+static void
+test_oa_formats(void)
+{
+ int oa_exponent = 13;
+
+ for (int i = 0; i < ARRAY_SIZE(oa_formats); i++) {
+ uint32_t oa_report0[64];
+ uint32_t oa_report1[64];
+ uint32_t *a0, *b0, *c0;
+ uint32_t *a1, *b1, *c1;
+ uint32_t time_delta;
+ uint32_t clock_delta;
+ uint32_t max_delta;
+
+ if (!oa_formats[i].name) /* sparse, indexed by ID */
+ continue;
+
+ igt_debug("Checking OA format %s\n", oa_formats[i].name);
+
+ open_and_read_2_oa_reports(i,
+ oa_exponent,
+ oa_report0,
+ oa_report1,
+ false); /* timer reports only */
+
+ print_reports(oa_report0, oa_report1, i);
+
+ a0 = (uint32_t *)(((uint8_t *)oa_report0) + oa_formats[i].a_off);
+ b0 = (uint32_t *)(((uint8_t *)oa_report0) + oa_formats[i].b_off);
+ c0 = (uint32_t *)(((uint8_t *)oa_report0) + oa_formats[i].c_off);
+
+ a1 = (uint32_t *)(((uint8_t *)oa_report1) + oa_formats[i].a_off);
+ b1 = (uint32_t *)(((uint8_t *)oa_report1) + oa_formats[i].b_off);
+ c1 = (uint32_t *)(((uint8_t *)oa_report1) + oa_formats[i].c_off);
+
+ time_delta = timebase_scale(oa_report1[1] - oa_report0[1]);
+ igt_assert_neq(time_delta, 0);
+
+ /* C2 corresponds to a clock counter for the Haswell render
+ * basic metric set but it's not included in all of the
+ * formats.
+ */
+ if (oa_formats[i].n_c) {
+ uint64_t freq;
+
+ /* The first report might have a clock count of zero
+ * but we wouldn't expect that in the second report...
+ */
+ igt_assert_neq(c1[2], 0);
+
+ clock_delta = c1[2] - c0[2];
+ igt_assert_neq(clock_delta, 0);
+
+ freq = ((uint64_t)clock_delta * 1000) / time_delta;
+ igt_debug("freq = %"PRIu64"\n", freq);
+
+ igt_assert(freq <= gt_max_freq_mhz);
+ } else {
+ /* Assume running at max freq for sake of
+ * below sanity check on counters... */
+ clock_delta = (gt_max_freq_mhz *
+ (uint64_t)time_delta) / 1000;
+ }
+
+ igt_debug("clock delta = %"PRIu32"\n", clock_delta);
+
+ /* The maximum rate for any HSW counter =
+ * clock_delta * 40 EUs
+ *
+ * Sanity check that no counters exceed this delta.
+ */
+ max_delta = clock_delta * 40;
+
+ for (int j = oa_formats[i].first_a;
+ j < oa_formats[i].n_a;
+ j++)
+ {
+ uint32_t delta = a1[j] - a0[j];
+
+ if (hsw_undefined_a_counters[j])
+ continue;
+
+ igt_debug("A%d: delta = %"PRIu32"\n", j, delta);
+ igt_assert(delta <= max_delta);
+ }
+
+ for (int j = 0; j < oa_formats[i].n_b; j++) {
+ uint32_t delta = b1[j] - b0[j];
+ igt_debug("B%d: delta = %"PRIu32"\n", j, delta);
+ igt_assert(delta <= max_delta);
+ }
+
+ for (int j = 0; j < oa_formats[i].n_c; j++) {
+ uint32_t delta = c1[j] - c0[j];
+ igt_debug("C%d: delta = %"PRIu32"\n", j, delta);
+ igt_assert(delta <= max_delta);
+ }
+ }
+}
+
+static void
+test_oa_exponents(int gt_freq_mhz)
+{
+ /* This test tries to use the sysfs interface for pinning the GT
+ * frequency so we have another point of reference for comparing with
+ * the clock frequency as derived from OA reports.
+ *
+ * This test has been finicky to stabilise while the
+ * gt_min/max_freq_mhz files in sysfs don't seem to be a reliable
+ * mechanism for fixing the gpu frequency.
+ *
+ * Since these unit tests are focused on the OA unit not the ability to
+ * pin the frequency via sysfs we make the test account for pinning not
+ * being reliable and read back the current frequency for each
+ * iteration of this test to take this into account.
+ */
+ gt_frequency_pin(gt_freq_mhz);
+
+ igt_debug("Testing OA timer exponents with requested GT frequency = %dmhz\n",
+ gt_freq_mhz);
+
+ /* It's asking a lot to sample with a 160 nanosecond period and the
+ * test can fail due to buffer overflows if it wasn't possible to
+ * keep up, so we don't start from an exponent of zero...
+ */
+ for (int i = 2; i < 20; i++) {
+ uint32_t expected_timestamp_delta;
+ uint32_t timestamp_delta;
+ uint32_t oa_report0[64];
+ uint32_t oa_report1[64];
+ uint32_t *c0, *c1;
+ uint32_t time_delta;
+ uint32_t clock_delta;
+ uint32_t freq;
+ int n_tested = 0;
+ int n_freq_matches = 0;
+
+ /* The exponent is effectively selecting a bit in the timestamp
+ * to trigger reports on and so in practice we expect the raw
+ * timestamp deltas for periodic reports to exactly match the
+ * value of next bit.
+ */
+ expected_timestamp_delta = 2 << i;
+
+ for (int j = 0; n_tested < 10 && j < 100; j++) {
+ int gt_freq_mhz_0, gt_freq_mhz_1;
+ int c_off;
+
+ gt_freq_mhz_0 = sysfs_read("gt_act_freq_mhz");
+
+ igt_debug("ITER %d: testing OA exponent %d with sysfs GT freq = %dmhz\n",
+ j, i, gt_freq_mhz_0);
+
+ open_and_read_2_oa_reports(I915_OA_FORMAT_A45_B8_C8,
+ i, /* exponent */
+ oa_report0,
+ oa_report1,
+ true); /* timer triggered
+ reports only */
+
+ gt_freq_mhz_1 = sysfs_read("gt_act_freq_mhz");
+
+ /* If it looks like the frequency has changed according
+ * to sysfs then skip looking at this pair of reports
+ */
+ if (gt_freq_mhz_0 != gt_freq_mhz_1) {
+ igt_debug("skipping OA reports pair due to GT frequency change according to sysfs\n");
+ continue;
+ }
+
+ timestamp_delta = oa_report1[1] - oa_report0[1];
+ igt_assert_neq(timestamp_delta, 0);
+
+ if (timestamp_delta != expected_timestamp_delta) {
+ igt_debug("timestamp0 = %u/0x%x\n",
+ oa_report0[1], oa_report0[1]);
+ igt_debug("timestamp1 = %u/0x%x\n",
+ oa_report1[1], oa_report1[1]);
+ }
+
+ igt_assert_eq(timestamp_delta, expected_timestamp_delta);
+
+ /* NB: for the render basic metric set opened above by
+ * open_and_read_2_oa_reports(), the C2 counter is
+ * configured as the gpu clock counter...
+ */
+ c_off = oa_formats[I915_OA_FORMAT_A45_B8_C8].c_off;
+ igt_assert(c_off);
+ c0 = (uint32_t *)(((uint8_t *)oa_report0) + c_off);
+ c1 = (uint32_t *)(((uint8_t *)oa_report1) + c_off);
+ clock_delta = c1[2] - c0[2];
+
+ time_delta = timebase_scale(timestamp_delta);
+
+ freq = ((uint64_t)clock_delta * 1000) / time_delta;
+ igt_debug("ITER %d: time delta = %"PRIu32"(ns) clock delta = %"PRIu32" freq = %"PRIu32"(mhz)\n",
+ j, time_delta, clock_delta, freq);
+
+ if (freq == gt_freq_mhz_1)
+ n_freq_matches++;
+
+ n_tested++;
+ }
+
+ if (n_tested < 10)
+ igt_debug("sysfs frequency pinning too unstable for cross-referencing with OA derived frequency");
+ igt_assert_eq(n_tested, 10);
+
+ igt_debug("number of iterations with expected clock frequency = %d\n",
+ n_freq_matches);
+
+ /* Don't assert the calculated frequency for extremely short
+ * durations.
+ *
+ * Allow some mismatches since can't be can't be sure about
+ * frequency changes between sysfs reads.
+ */
+ if (i > 3)
+ igt_assert(n_freq_matches >= 7);
+ }
+
+ gt_frequency_range_restore();
+}
+
+/* The OA exponent selects a timestamp counter bit to trigger reports on.
+ *
+ * With a 64bit timestamp and least significant bit approx == 80ns then the MSB
+ * equates to > 40 thousand years and isn't exposed via the i915 perf interface.
+ *
+ * The max exponent exposed is expected to be 31, which is still a fairly
+ * ridiculous period (>5min) but is the maximum exponent where it's still
+ * possible to use periodic sampling as a means for tracking the overflow of
+ * 32bit OA report timestamps.
+ */
+static void
+test_invalid_oa_exponent(void)
+{
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ DRM_I915_PERF_PROP_OA_EXPONENT, 31, /* maximum exponent expected
+ to be accepted */
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC,
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+ int stream_fd = __perf_open(drm_fd, ¶m);
+
+ close(stream_fd);
+
+ for (int i = 32; i < 65; i++) {
+ properties[7] = i;
+ do_ioctl_err(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m, EINVAL);
+ }
+}
+
+/* Return the largest OA exponent that will still result in a sampling
+ * frequency higher than the given frequency.
+ */
+static int
+max_oa_exponent_for_higher_freq(uint64_t freq)
+{
+ /* NB: timebase_scale() takes a uint32_t and an exponent of 30
+ * would already represent a period of ~3 minutes so there's
+ * really no need to consider higher exponents.
+ */
+ for (int i = 0; i < 30; i++) {
+ uint64_t oa_period = timebase_scale(2 << i);
+ uint32_t oa_freq = NSEC_PER_SEC / oa_period;
+
+ if (oa_freq <= freq)
+ return max(0, i - 1);
+ }
+
+ igt_assert(!"reached");
+ return -1;
+}
+
+/* The lowest periodic sampling exponent equates to a period of 160 nanoseconds
+ * or a frequency of 6.25MHz which is only possible to request as root by
+ * default. By default the maximum OA sampling rate is 100KHz
+ */
+static void
+test_low_oa_exponent_permissions(void)
+{
+ int max_freq = read_u64_file("/proc/sys/dev/i915/oa_max_sample_rate");
+ int bad_exponent = max_oa_exponent_for_higher_freq(max_freq);
+ int ok_exponent = bad_exponent + 1;
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ DRM_I915_PERF_PROP_OA_EXPONENT, bad_exponent,
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC,
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+ uint64_t oa_period, oa_freq;
+
+ igt_assert_eq(max_freq, 100000);
+
+ /* Avoid EACCES errors opening a stream without CAP_SYS_ADMIN */
+ write_u64_file("/proc/sys/dev/i915/perf_stream_paranoid", 0);
+
+ igt_fork(child, 1) {
+ igt_drop_root();
+
+ do_ioctl_err(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m, EACCES);
+ }
+
+ igt_waitchildren();
+
+ properties[7] = ok_exponent;
+
+ igt_fork(child, 1) {
+ int stream_fd;
+
+ igt_drop_root();
+
+ stream_fd = __perf_open(drm_fd, ¶m);
+ close(stream_fd);
+ }
+
+ igt_waitchildren();
+
+ oa_period = timebase_scale(2 << ok_exponent);
+ oa_freq = NSEC_PER_SEC / oa_period;
+ write_u64_file("/proc/sys/dev/i915/oa_max_sample_rate", oa_freq - 100);
+
+ igt_fork(child, 1) {
+ igt_drop_root();
+
+ do_ioctl_err(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m, EACCES);
+ }
+
+ igt_waitchildren();
+
+ /* restore the defaults */
+ write_u64_file("/proc/sys/dev/i915/oa_max_sample_rate", 100000);
+ write_u64_file("/proc/sys/dev/i915/perf_stream_paranoid", 1);
+}
+
+static void
+test_per_context_mode_unprivileged(void)
+{
+ uint64_t properties[] = {
+ /* Single context sampling */
+ DRM_I915_PERF_PROP_CTX_HANDLE, UINT64_MAX, /* updated below */
+
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ DRM_I915_PERF_PROP_OA_EXPONENT, 13, /* 1 millisecond */
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC,
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+
+ /* should be default, but just to be sure... */
+ write_u64_file("/proc/sys/dev/i915/perf_stream_paranoid", 1);
+
+ igt_fork(child, 1) {
+ drm_intel_context *context;
+ drm_intel_bufmgr *bufmgr;
+ int stream_fd;
+
+ igt_drop_root();
+
+ bufmgr = drm_intel_bufmgr_gem_init(drm_fd, 4096);
+ context = drm_intel_gem_context_create(bufmgr);
+
+ igt_assert(context);
+
+ properties[1] = drm_intel_gem_context_get_context_id(context);
+
+ stream_fd = __perf_open(drm_fd, ¶m);
+ close(stream_fd);
+
+ drm_intel_gem_context_destroy(context);
+ drm_intel_bufmgr_destroy(bufmgr);
+ }
+
+ igt_waitchildren();
+}
+
+static int64_t
+get_time(void)
+{
+ struct timespec ts;
+
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+
+ return ts.tv_sec * 1000000000 + ts.tv_nsec;
+}
+
+/* Note: The interface doesn't currently provide strict guarantees or control
+ * over the upper bound for how long it might take for a POLLIN event after
+ * some OA report is written by the OA unit.
+ *
+ * The plan is to add a property later that gives some control over the maximum
+ * latency, but for now we expect it is tuned for a fairly low latency
+ * suitable for applications wanting to provide live feedback for captured
+ * metrics.
+ *
+ * At the time of writing this test the driver was using a fixed 200Hz hrtimer
+ * regardless of the OA sampling exponent.
+ *
+ * There is no lower bound since a stream configured for periodic sampling may
+ * still contain other automatically triggered reports.
+ *
+ * What we try and check for here is that blocking reads don't return EAGAIN
+ * and that we aren't spending any significant time burning the cpu in
+ * kernelspace.
+ */
+static void
+test_blocking(void)
+{
+ /* 40 milliseconds
+ *
+ * Having a period somewhat > sysconf(_SC_CLK_TCK) helps to stop
+ * scheduling (liable to kick in when we make blocking poll()s/reads)
+ * from interfering with the test.
+ */
+ int oa_exponent = 18;
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ 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 = (uint64_t)properties,
+ };
+ int stream_fd = __perf_open(drm_fd, ¶m);
+ uint8_t buf[1024 * 1024];
+ struct tms start_times;
+ struct tms end_times;
+ int64_t user_ns, kernel_ns;
+ int64_t tick_ns = 1000000000 / sysconf(_SC_CLK_TCK);
+ int64_t start;
+ int n = 0;
+
+ times(&start_times);
+
+ /* Loop for 600ms performing blocking reads while the HW is sampling at
+ * ~25Hz, with the expectation that we spend most of our time blocked
+ * in the kernel, and shouldn't be burning cpu cycles in the kernel in
+ * association with this process (verified by looking at stime before
+ * and after loop).
+ */
+ for (start = get_time(); (get_time() - start) < 600000000; /* nop */) {
+ int ret;
+
+ while ((ret = read(stream_fd, buf, sizeof(buf))) < 0 &&
+ errno == EINTR)
+ ;
+
+ igt_assert(ret > 0);
+
+ n++;
+ }
+
+ times(&end_times);
+
+ /* Using nanosecond units is fairly silly here, given the tick in-
+ * precision - ah well, it's consistent with the get_time() units.
+ */
+ user_ns = (end_times.tms_utime - start_times.tms_utime) * tick_ns;
+ kernel_ns = (end_times.tms_stime - start_times.tms_stime) * tick_ns;
+
+ igt_debug("%d blocking reads in 500 milliseconds, with 1KHz OA sampling\n", n);
+ igt_debug("time in userspace = %"PRIu64"ns (start utime = %d, end = %d, ns ticks per sec = %d)\n",
+ user_ns, (int)start_times.tms_utime, (int)end_times.tms_utime, (int)tick_ns);
+ igt_debug("time in kernelspace = %"PRIu64"ns (start stime = %d, end = %d, ns ticks per sec = %d)\n",
+ kernel_ns, (int)start_times.tms_stime, (int)end_times.tms_stime, (int)tick_ns);
+
+ /* With completely broken blocking (but also not returning an error) we
+ * could end up with an open loop, hopefully recognisable with > 15
+ * (600/40)iterations.
+ */
+ igt_assert(n <= 15);
+
+ /* It's a bit tricky to put a lower limit here, but we expect a
+ * relatively low latency for seeing reports, while we don't currently
+ * give any control over this in the api.
+ *
+ * Limited to a 5 millisecond latency and 45ms (worst case)
+ * per-iteration that could give 13.3 iterations. Rounding gives a tiny
+ * bit more latency slack (6ms)...
+ */
+ igt_assert(n > 13);
+
+ /* A bit tricky to put a number on this, but we don't expect the kernel
+ * to use any significant cpu while waiting and given the in precision
+ * of stime (multiple of CLK_TCK) we expect this to round to zero.
+ */
+ igt_assert_eq(kernel_ns, 0);
+
+ close(stream_fd);
+}
+
+static void
+test_polling(void)
+{
+ /* 40 milliseconds
+ *
+ * Having a period somewhat > sysconf(_SC_CLK_TCK) helps to stop
+ * scheduling (liable to kick in when we make blocking poll()s/reads)
+ * from interfering with the test.
+ */
+ int oa_exponent = 18;
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ DRM_I915_PERF_PROP_OA_EXPONENT, oa_exponent,
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC |
+ I915_PERF_FLAG_FD_NONBLOCK,
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+ int stream_fd = __perf_open(drm_fd, ¶m);
+ uint8_t buf[1024 * 1024];
+ struct tms start_times;
+ struct tms end_times;
+ int64_t user_ns, kernel_ns;
+ int64_t tick_ns = 1000000000 / sysconf(_SC_CLK_TCK);
+ int64_t start;
+ int n = 0;
+
+ times(&start_times);
+
+ /* Loop for 600ms performing blocking polls while the HW is sampling at
+ * ~25Hz, with the expectation that we spend most of our time blocked
+ * in the kernel, and shouldn't be burning cpu cycles in the kernel in
+ * association with this process (verified by looking at stime before
+ * and after loop).
+ */
+ for (start = get_time(); (get_time() - start) < 600000000; /* nop */) {
+ struct pollfd pollfd = { .fd = stream_fd, .events = POLLIN };
+ int ret;
+
+ while ((ret = poll(&pollfd, 1, -1)) < 0 &&
+ errno == EINTR)
+ ;
+ igt_assert_eq(ret, 1);
+ igt_assert(pollfd.revents & POLLIN);
+
+ while ((ret = read(stream_fd, buf, sizeof(buf))) < 0 &&
+ errno == EINTR)
+ ;
+
+ /* Don't expect to see EAGAIN if we've had a POLLIN event
+ *
+ * XXX: actually this is technically overly strict since we do
+ * knowingly allow false positive POLLIN events. At least in
+ * the future when supporting context filtering of metrics for
+ * Gen8+ handled in the kernel then POLLIN events may be
+ * delivered when we know there are pending reports to process
+ * but before we've done any filtering to know for certain that
+ * any reports are destined to be copied to userspace.
+ *
+ * Still, for now it's a reasonable sanity check.
+ */
+ if (ret < 0)
+ igt_debug("Unexpected error when reading after poll = %d\n", errno);
+ igt_assert_neq(ret, -1);
+
+ /* At this point, after consuming pending reports (and hoping
+ * the scheduler hasn't stopped us for too long we now
+ * expect EAGAIN on read.
+ */
+ while ((ret = read(stream_fd, buf, sizeof(buf))) < 0 &&
+ errno == EINTR)
+ ;
+ igt_assert_eq(ret, -1);
+ igt_assert_eq(errno, EAGAIN);
+
+ n++;
+ }
+
+ times(&end_times);
+
+ /* Using nanosecond units is fairly silly here, given the tick in-
+ * precision - ah well, it's consistent with the get_time() units.
+ */
+ user_ns = (end_times.tms_utime - start_times.tms_utime) * tick_ns;
+ kernel_ns = (end_times.tms_stime - start_times.tms_stime) * tick_ns;
+
+ igt_debug("%d blocking poll()s in 600 milliseconds, with 25Hz OA sampling\n", n);
+ igt_debug("time in userspace = %"PRIu64"ns (start utime = %d, end = %d, ns ticks per sec = %d)\n",
+ user_ns, (int)start_times.tms_utime, (int)end_times.tms_utime, (int)tick_ns);
+ igt_debug("time in kernelspace = %"PRIu64"ns (start stime = %d, end = %d, ns ticks per sec = %d)\n",
+ kernel_ns, (int)start_times.tms_stime, (int)end_times.tms_stime, (int)tick_ns);
+
+ /* With completely broken blocking while polling (but still somehow
+ * reporting a POLLIN event) we could end up with an open loop,
+ * hopefully recognisable with > 15 (600/40)iterations.
+ */
+ igt_assert(n <= 15);
+
+ /* It's a bit tricky to put a lower limit here, but we expect a
+ * relatively low latency for seeing reports, while we don't currently
+ * give any control over this in the api.
+ *
+ * Limited to a 5 millisecond latency and 45ms (worst case)
+ * per-iteration that could give 13.3 iterations. Rounding gives a tiny
+ * bit more latency slack (6ms)...
+ */
+ igt_assert(n > 13);
+
+ /* A bit tricky to put a number on this, but we don't expect the kernel
+ * to use any significant cpu while waiting and given the in precision
+ * of stime (multiple of CLK_TCK) we expect this to round to zero.
+ */
+ igt_assert_eq(kernel_ns, 0);
+
+ close(stream_fd);
+}
+
+static void
+test_buffer_fill(void)
+{
+ int oa_exponent = 5; /* 5 micro seconds */
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ 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 = (uint64_t)properties,
+ };
+ int stream_fd = __perf_open(drm_fd, ¶m);
+ int buf_size = 65536 * (256 + sizeof(struct drm_i915_perf_record_header));
+ uint8_t *buf = malloc(buf_size);
+
+
+ for (int i = 0; i < 5; i++) {
+ struct drm_i915_perf_record_header *header;
+ bool overflow_seen;
+ int offset = 0;
+ int len;
+
+ /* It should take ~330 milliseconds to fill a 16MB OA buffer with a
+ * 5 microsecond sampling period and 256 byte reports. */
+ nanosleep(&(struct timespec){ .tv_sec = 0, .tv_nsec = 500000000 }, NULL);
+
+ while ((len = read(stream_fd, buf, buf_size)) == -1 && errno == EINTR)
+ ;
+
+ igt_assert_neq(len, -1);
+
+ overflow_seen = false;
+ for (offset = 0; offset < len; offset += header->size) {
+ header = (void *)(buf + offset);
+
+ if (header->type == DRM_I915_PERF_RECORD_OA_BUFFER_LOST)
+ overflow_seen = true;
+ }
+
+ igt_assert_eq(overflow_seen, true);
+
+ nanosleep(&(struct timespec){ .tv_sec = 0, .tv_nsec = 1000000 }, NULL);
+
+ while ((len = read(stream_fd, buf, buf_size)) == -1 && errno == EINTR)
+ ;
+
+ igt_assert_neq(len, -1);
+
+ /* expect ~ 200 records in 1 millisecond */
+ igt_assert(len > 256 * 150);
+
+ overflow_seen = false;
+ for (offset = 0; offset < len; offset += header->size) {
+ header = (void *)(buf + offset);
+
+ if (header->type == DRM_I915_PERF_RECORD_OA_BUFFER_LOST)
+ overflow_seen = true;
+ }
+
+ igt_assert_eq(overflow_seen, false);
+ }
+
+ free(buf);
+
+ close(stream_fd);
+}
+
+static void
+test_enable_disable(void)
+{
+ int oa_exponent = 5; /* 5 micro seconds */
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ DRM_I915_PERF_PROP_OA_EXPONENT, oa_exponent,
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC |
+ I915_PERF_FLAG_DISABLED, /* Verify we start disabled */
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+ int stream_fd = __perf_open(drm_fd, ¶m);
+ int buf_size = 65536 * (256 + sizeof(struct drm_i915_perf_record_header));
+ uint8_t *buf = malloc(buf_size);
+
+
+ for (int i = 0; i < 5; i++) {
+ int len;
+
+ /* If the stream were enabled then it would take ~330
+ * milliseconds to fill a 16MB OA buffer with a 5 microsecond
+ * sampling period and 256 byte reports.
+ *
+ * Giving enough time for an overflow might help catch whether
+ * the OA unit has been enabled even if the driver might at
+ * least avoid copying reports while disabled.
+ */
+ nanosleep(&(struct timespec){ .tv_sec = 0, .tv_nsec = 500000000 }, NULL);
+
+ while ((len = read(stream_fd, buf, buf_size)) == -1 && errno == EINTR)
+ ;
+
+ igt_assert_eq(len, -1);
+ igt_assert_eq(errno, EIO);
+
+ do_ioctl(stream_fd, I915_PERF_IOCTL_ENABLE, 0);
+
+ nanosleep(&(struct timespec){ .tv_sec = 0, .tv_nsec = 1000000 }, NULL);
+
+ while ((len = read(stream_fd, buf, buf_size)) == -1 && errno == EINTR)
+ ;
+
+ igt_assert_neq(len, -1);
+
+ /* expect ~ 200 records in 1 millisecond */
+ igt_assert(len > 256 * 150 && len < 256 * 2000);
+
+ do_ioctl(stream_fd, I915_PERF_IOCTL_DISABLE, 0);
+
+ /* It's considered an error to read a stream while it's disabled
+ * since it would block indefinitely...
+ */
+ len = read(stream_fd, buf, buf_size);
+
+ igt_assert_eq(len, -1);
+ igt_assert_eq(errno, EIO);
+ }
+
+ free(buf);
+
+ close(stream_fd);
+}
+
+static void
+test_short_reads(void)
+{
+ int oa_exponent = 5; /* 5 micro seconds */
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ 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 = (uint64_t)properties,
+ };
+ size_t record_size = 256 + sizeof(struct drm_i915_perf_record_header);
+ size_t page_size = sysconf(_SC_PAGE_SIZE);
+ int zero_fd = open("/dev/zero", O_RDWR|O_CLOEXEC);
+ uint8_t *pages = mmap(NULL, page_size * 2,
+ PROT_READ|PROT_WRITE, MAP_PRIVATE, zero_fd, 0);
+ struct drm_i915_perf_record_header *header;
+ int stream_fd;
+ int ret;
+
+ igt_assert_neq(zero_fd, -1);
+ close(zero_fd);
+ zero_fd = -1;
+
+ igt_assert(pages);
+
+ ret = mprotect(pages + page_size, page_size, PROT_NONE);
+ igt_assert_eq(ret, 0);
+
+ stream_fd = __perf_open(drm_fd, ¶m);
+
+ nanosleep(&(struct timespec){ .tv_sec = 0, .tv_nsec = 5000000 }, NULL);
+
+ /* At this point there should be lots of pending reports to read */
+
+ /* A read that can return at least one record should result in a short
+ * read not an EFAULT if the buffer is smaller than the requested read
+ * size...
+ *
+ * Expect to see a sample record here, but at least skip over any
+ * _RECORD_LOST notifications.
+ */
+ do {
+ header = (void *)(pages + page_size - record_size);
+ ret = read(stream_fd,
+ header,
+ page_size);
+ igt_assert(ret > 0);
+ } while (header->type == DRM_I915_PERF_RECORD_OA_REPORT_LOST);
+
+ igt_assert_eq(ret, record_size);
+
+ /* A read that can't return a single record because it would result
+ * in a fault on buffer overrun should result in an EFAULT error...
+ */
+ ret = read(stream_fd, pages + page_size - 16, page_size);
+ igt_assert_eq(ret, -1);
+ igt_assert_eq(errno, EFAULT);
+
+ /* A read that can't return a single record because the buffer is too
+ * small should result in an ENOSPC error..
+ *
+ * Again, skip over _RECORD_LOST records (smaller than record_size/2)
+ */
+ do {
+ header = (void *)(pages + page_size - record_size / 2);
+ ret = read(stream_fd,
+ header,
+ record_size / 2);
+ } while (ret > 0 && header->type == DRM_I915_PERF_RECORD_OA_REPORT_LOST);
+
+ igt_assert_eq(ret, -1);
+ igt_assert_eq(errno, ENOSPC);
+
+ close(stream_fd);
+
+ munmap(pages, page_size * 2);
+}
+
+static void
+test_non_sampling_read_error(void)
+{
+ uint64_t properties[] = {
+ /* XXX: even without periodic sampling we have to
+ * specify at least one sample layout property...
+ */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+
+ /* XXX: no sampling exponent */
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC,
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+ int stream_fd = __perf_open(drm_fd, ¶m);
+ uint8_t buf[1024];
+
+ int ret = read(stream_fd, buf, sizeof(buf));
+ igt_assert_eq(ret, -1);
+ igt_assert_eq(errno, EIO);
+
+ close(stream_fd);
+}
+
+/* Check that attempts to read from a stream while it is disable will return
+ * EIO instead of blocking indefinitely.
+ */
+static void
+test_disabled_read_error(void)
+{
+ int oa_exponent = 5; /* 5 micro seconds */
+ uint64_t properties[] = {
+ /* XXX: even without periodic sampling we have to
+ * specify at least one sample layout property...
+ */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ DRM_I915_PERF_PROP_OA_EXPONENT, oa_exponent,
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC |
+ I915_PERF_FLAG_DISABLED, /* XXX: open disabled */
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+ int stream_fd = __perf_open(drm_fd, ¶m);
+ uint32_t oa_report0[64];
+ uint32_t oa_report1[64];
+ uint32_t buf[128] = { 0 };
+ int ret;
+
+
+ ret = read(stream_fd, buf, sizeof(buf));
+ igt_assert_eq(ret, -1);
+ igt_assert_eq(errno, EIO);
+
+ close(stream_fd);
+
+
+ param.flags &= ~I915_PERF_FLAG_DISABLED;
+ stream_fd = __perf_open(drm_fd, ¶m);
+
+ read_2_oa_reports(stream_fd,
+ I915_OA_FORMAT_A45_B8_C8,
+ oa_exponent,
+ oa_report0,
+ oa_report1,
+ false); /* not just timer reports */
+
+ do_ioctl(stream_fd, I915_PERF_IOCTL_DISABLE, 0);
+
+ ret = read(stream_fd, buf, sizeof(buf));
+ igt_assert_eq(ret, -1);
+ igt_assert_eq(errno, EIO);
+
+ do_ioctl(stream_fd, I915_PERF_IOCTL_ENABLE, 0);
+
+ read_2_oa_reports(stream_fd,
+ I915_OA_FORMAT_A45_B8_C8,
+ oa_exponent,
+ oa_report0,
+ oa_report1,
+ false); /* not just timer reports */
+
+ close(stream_fd);
+}
+
+static void
+test_mi_rpc(void)
+{
+ uint64_t properties[] = {
+ /* Note: we have to specify at least one sample property even
+ * though we aren't interested in samples in this case.
+ */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+
+ /* Note: no OA exponent specified in this case */
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC,
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+ int stream_fd = __perf_open(drm_fd, ¶m);
+ drm_intel_bufmgr *bufmgr = drm_intel_bufmgr_gem_init(drm_fd, 4096);
+ drm_intel_context *context;
+ struct intel_batchbuffer *batch;
+ drm_intel_bo *bo;
+ uint32_t *report32;
+ int ret;
+
+ drm_intel_bufmgr_gem_enable_reuse(bufmgr);
+
+ context = drm_intel_gem_context_create(bufmgr);
+ igt_assert(context);
+
+ batch = intel_batchbuffer_alloc(bufmgr, devid);
+
+ bo = drm_intel_bo_alloc(bufmgr, "mi_rpc dest bo", 4096, 64);
+
+ ret = drm_intel_bo_map(bo, true);
+ igt_assert_eq(ret, 0);
+
+ memset(bo->virtual, 0x80, 4096);
+ drm_intel_bo_unmap(bo);
+
+ BEGIN_BATCH(3, 1);
+ OUT_BATCH(GEN6_MI_REPORT_PERF_COUNT);
+ OUT_RELOC(bo, I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
+ 0); /* offset in bytes */
+ OUT_BATCH(0xdeadbeef); /* report ID */
+ ADVANCE_BATCH();
+
+ intel_batchbuffer_flush_with_context(batch, context);
+
+ ret = drm_intel_bo_map(bo, false /* write enable */);
+ igt_assert_eq(ret, 0);
+
+ report32 = bo->virtual;
+ igt_assert_eq(report32[0], 0xdeadbeef); /* report ID */
+ igt_assert_neq(report32[1], 0); /* timestamp */
+
+ igt_assert_neq(report32[63], 0x80808080); /* end of report */
+ igt_assert_eq(report32[64], 0x80808080); /* after 256 byte report */
+
+ drm_intel_bo_unmap(bo);
+ drm_intel_bo_unreference(bo);
+ intel_batchbuffer_free(batch);
+ drm_intel_gem_context_destroy(context);
+ drm_intel_bufmgr_destroy(bufmgr);
+ close(stream_fd);
+}
+
+static void
+scratch_buf_init(drm_intel_bufmgr *bufmgr,
+ struct igt_buf *buf,
+ int width, int height,
+ uint32_t color)
+{
+ size_t stride = width * 4;
+ size_t size = stride * height;
+ drm_intel_bo *bo = drm_intel_bo_alloc(bufmgr, "", size, 4096);
+ int ret;
+
+ ret = drm_intel_bo_map(bo, true /* writable */);
+ igt_assert_eq(ret, 0);
+
+ for (int i = 0; i < width * height; i++)
+ ((uint32_t *)bo->virtual)[i] = color;
+
+ drm_intel_bo_unmap(bo);
+
+ buf->bo = bo;
+ buf->stride = stride;
+ buf->tiling = I915_TILING_NONE;
+ buf->size = size;
+}
+
+static void
+emit_stall_timestamp_and_rpc(struct intel_batchbuffer *batch,
+ drm_intel_bo *dst,
+ int timestamp_offset,
+ int report_dst_offset,
+ uint32_t report_id)
+{
+ uint32_t pipe_ctl_flags = (PIPE_CONTROL_CS_STALL |
+ PIPE_CONTROL_RENDER_TARGET_FLUSH |
+ PIPE_CONTROL_WRITE_TIMESTAMP);
+
+ BEGIN_BATCH(5, 1);
+ OUT_BATCH(GFX_OP_PIPE_CONTROL | (5 - 2));
+ OUT_BATCH(pipe_ctl_flags);
+ OUT_RELOC(dst, I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
+ timestamp_offset);
+ OUT_BATCH(0); /* imm lower */
+ OUT_BATCH(0); /* imm upper */
+ ADVANCE_BATCH();
+
+ BEGIN_BATCH(3, 1);
+ OUT_BATCH(GEN6_MI_REPORT_PERF_COUNT);
+ OUT_RELOC(dst, I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
+ report_dst_offset);
+ OUT_BATCH(report_id);
+ ADVANCE_BATCH();
+}
+
+/* Tests the INTEL_performance_query use case where an unprivileged process
+ * should be able to configure the OA unit for per-context metrics (for a
+ * context associated with that process' drm file descriptor) and the counters
+ * should only relate to that specific context.
+ */
+static void
+test_per_ctx_mi_rpc(void)
+{
+ uint64_t properties[] = {
+ DRM_I915_PERF_PROP_CTX_HANDLE, UINT64_MAX, /* updated below */
+
+ /* Note: we have to specify at least one sample property even
+ * though we aren't interested in samples in this case
+ */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+
+ /* Note: no OA exponent specified in this case */
+ };
+ struct drm_i915_perf_open_param param = {
+ .flags = I915_PERF_FLAG_FD_CLOEXEC,
+ .num_properties = sizeof(properties) / 16,
+ .properties_ptr = (uint64_t)properties,
+ };
+
+ /* should be default, but just to be sure... */
+ write_u64_file("/proc/sys/dev/i915/perf_stream_paranoid", 1);
+
+ igt_fork(child, 1) {
+ drm_intel_bufmgr *bufmgr;
+ drm_intel_context *context0, *context1;
+ int stream_fd;
+ struct intel_batchbuffer *batch;
+ struct igt_buf src, dst;
+ drm_intel_bo *bo;
+ uint32_t *report0_32, *report1_32;
+ uint64_t timestamp0_64, timestamp1_64;
+ uint32_t delta_ts64, delta_oa32;
+ uint64_t delta_ts64_ns, delta_oa32_ns;
+ uint32_t delta_delta;
+ int n_samples_written;
+ int width = 800;
+ int height = 600;
+ int ret;
+
+ igt_drop_root();
+
+ bufmgr = drm_intel_bufmgr_gem_init(drm_fd, 4096);
+ drm_intel_bufmgr_gem_enable_reuse(bufmgr);
+
+ scratch_buf_init(bufmgr, &src, width, height, 0xff0000ff);
+ scratch_buf_init(bufmgr, &dst, width, height, 0x00ff00ff);
+
+ batch = intel_batchbuffer_alloc(bufmgr, devid);
+
+ context0 = drm_intel_gem_context_create(bufmgr);
+ igt_assert(context0);
+
+ context1 = drm_intel_gem_context_create(bufmgr);
+ igt_assert(context1);
+
+ igt_debug("submitting warm up render_copy\n");
+
+ /* Submit some early, unmeasured, work to the context we want
+ * to measure to try and catch issues with i915-perf
+ * initializing the HW context ID for filtering.
+ *
+ * We do this because i915-perf single context filtering had
+ * previously only relied on a hook into context pinning to
+ * initialize the HW context ID, instead of also trying to
+ * determine the HW ID while opening the stream, in case it
+ * has already been pinned.
+ *
+ * This wasn't noticed by the previous unit test because we
+ * were opening the stream while the context hadn't been
+ * touched or pinned yet and so it worked out correctly to wait
+ * for the pinning hook.
+ *
+ * Now a buggy version of i915-perf will fail to measure
+ * anything for context0 once this initial render_copy() ends
+ * up pinning the context since there won't ever be a pinning
+ * hook callback.
+ */
+ render_copy(batch,
+ context0,
+ &src, 0, 0, width, height,
+ &dst, 0, 0);
+
+ properties[1] = drm_intel_gem_context_get_context_id(context0);
+
+ igt_debug("opening i915-perf stream\n");
+ stream_fd = __perf_open(drm_fd, ¶m);
+
+ bo = drm_intel_bo_alloc(bufmgr, "mi_rpc dest bo", 4096, 64);
+
+ ret = drm_intel_bo_map(bo, true /* write enable */);
+ igt_assert_eq(ret, 0);
+
+ memset(bo->virtual, 0x80, 4096);
+ drm_intel_bo_unmap(bo);
+
+ emit_stall_timestamp_and_rpc(batch,
+ bo,
+ 512 /* timestamp offset */,
+ 0, /* report dst offset */
+ 0xdeadbeef); /* report id */
+
+ /* Explicitly flush here (even though the render_copy() call
+ * will itself flush before/after the copy) to clarify that
+ * that the PIPE_CONTROL + MI_RPC commands will be in a
+ * separate batch from the copy.
+ */
+ intel_batchbuffer_flush_with_context(batch, context0);
+
+ render_copy(batch,
+ context0,
+ &src, 0, 0, width, height,
+ &dst, 0, 0);
+
+ /* Another redundant flush to clarify batch bo is free to reuse */
+ intel_batchbuffer_flush_with_context(batch, context0);
+
+ /* submit two copies on the other context to avoid a false
+ * positive in case the driver somehow ended up filtering for
+ * context1
+ */
+ render_copy(batch,
+ context1,
+ &src, 0, 0, width, height,
+ &dst, 0, 0);
+
+ render_copy(batch,
+ context1,
+ &src, 0, 0, width, height,
+ &dst, 0, 0);
+
+ /* And another */
+ intel_batchbuffer_flush_with_context(batch, context1);
+
+ emit_stall_timestamp_and_rpc(batch,
+ bo,
+ 520 /* timestamp offset */,
+ 256, /* report dst offset */
+ 0xbeefbeef); /* report id */
+
+ intel_batchbuffer_flush_with_context(batch, context0);
+
+ ret = drm_intel_bo_map(bo, false /* write enable */);
+ igt_assert_eq(ret, 0);
+
+ report0_32 = bo->virtual;
+ igt_assert_eq(report0_32[0], 0xdeadbeef); /* report ID */
+ igt_assert_neq(report0_32[1], 0); /* timestamp */
+
+ report1_32 = report0_32 + 64;
+ igt_assert_eq(report1_32[0], 0xbeefbeef); /* report ID */
+ igt_assert_neq(report1_32[1], 0); /* timestamp */
+
+ print_reports(report0_32, report1_32,
+ lookup_format(I915_OA_FORMAT_A45_B8_C8));
+
+ /* A40 == N samples written to all render targets */
+ n_samples_written = report1_32[43] - report0_32[43];
+ igt_debug("n samples written = %d\n", n_samples_written);
+ igt_assert_eq(n_samples_written, width * height);
+
+ igt_debug("timestamp32 0 = %u\n", report0_32[1]);
+ igt_debug("timestamp32 1 = %u\n", report1_32[1]);
+
+ timestamp0_64 = *(uint64_t *)(((uint8_t *)bo->virtual) + 512);
+ timestamp1_64 = *(uint64_t *)(((uint8_t *)bo->virtual) + 520);
+
+ igt_debug("timestamp64 0 = %"PRIu64"\n", timestamp0_64);
+ igt_debug("timestamp64 1 = %"PRIu64"\n", timestamp1_64);
+
+ delta_ts64 = timestamp1_64 - timestamp0_64;
+ delta_oa32 = report1_32[1] - report0_32[1];
+
+ /* sanity check that we can pass the delta to timebase_scale */
+ igt_assert(delta_ts64 < UINT32_MAX);
+ delta_oa32_ns = timebase_scale(delta_oa32);
+ delta_ts64_ns = timebase_scale(delta_ts64);
+
+ igt_debug("ts32 delta = %u, = %uns\n",
+ delta_oa32, (unsigned)delta_oa32_ns);
+ igt_debug("ts64 delta = %u, = %uns\n",
+ delta_ts64, (unsigned)delta_ts64_ns);
+
+ /* The delta as calculated via the PIPE_CONTROL timestamp or
+ * the OA report timestamps should be almost identical but
+ * allow a 320 nanoseconds margin.
+ */
+ delta_delta = delta_ts64_ns > delta_oa32_ns ?
+ (delta_ts64_ns - delta_oa32_ns) :
+ (delta_oa32_ns - delta_ts64_ns);
+ igt_assert(delta_delta <= 320);
+
+ drm_intel_bo_unreference(src.bo);
+ drm_intel_bo_unreference(dst.bo);
+
+ drm_intel_bo_unmap(bo);
+ drm_intel_bo_unreference(bo);
+ intel_batchbuffer_free(batch);
+ drm_intel_gem_context_destroy(context0);
+ drm_intel_gem_context_destroy(context1);
+ drm_intel_bufmgr_destroy(bufmgr);
+ close(stream_fd);
+ }
+
+ igt_waitchildren();
+}
+
+static void
+test_rc6_disable(void)
+{
+ int oa_exponent = 13; /* 1 millisecond */
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, hsw_render_basic_id,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ 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 = (uint64_t)properties,
+ };
+ int stream_fd = __perf_open(drm_fd, ¶m);
+ uint64_t n_events_start = read_debugfs_u64_record("i915_drpc_info",
+ "RC6 residency since boot");
+ uint64_t n_events_end;
+
+ nanosleep(&(struct timespec){ .tv_sec = 0, .tv_nsec = 500000000 }, NULL);
+
+ n_events_end = read_debugfs_u64_record("i915_drpc_info",
+ "RC6 residency since boot");
+
+ igt_assert_eq(n_events_end - n_events_start, 0);
+
+ close(stream_fd);
+
+ n_events_start = read_debugfs_u64_record("i915_drpc_info",
+ "RC6 residency since boot");
+
+ nanosleep(&(struct timespec){ .tv_sec = 0, .tv_nsec = 500000000 }, NULL);
+
+ n_events_end = read_debugfs_u64_record("i915_drpc_info",
+ "RC6 residency since boot");
+
+ igt_assert_neq(n_events_end - n_events_start, 0);
+}
+
+static unsigned
+read_i915_module_ref(void)
+{
+ FILE *fp = fopen("/proc/modules", "r");
+ char *line = NULL;
+ size_t line_buf_size = 0;
+ int len = 0;
+ unsigned ref_count;
+
+ igt_assert(fp);
+
+ while ((len = getline(&line, &line_buf_size, fp)) > 0) {
+ if (strncmp(line, "i915 ", 5) == 0) {
+ unsigned long mem;
+ int ret = sscanf(line + 5, "%lu %u", &mem, &ref_count);
+ igt_assert(ret == 2);
+ goto done;
+ }
+ }
+
+ igt_assert(!"reached");
+
+done:
+ free(line);
+ fclose(fp);
+ return ref_count;
+}
+
+/* check that an open i915 perf stream holds a reference on the drm i915 module
+ * including in the corner case where the original drm fd has been closed.
+ */
+static void
+test_i915_ref_count(void)
+{
+ int oa_exponent = 13; /* 1 millisecond */
+ uint64_t properties[] = {
+ /* Include OA reports in samples */
+ DRM_I915_PERF_PROP_SAMPLE_OA, true,
+
+ /* OA unit configuration */
+ DRM_I915_PERF_PROP_OA_METRICS_SET, 0 /* updated below */,
+ DRM_I915_PERF_PROP_OA_FORMAT, I915_OA_FORMAT_A45_B8_C8,
+ 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 = (uint64_t)properties,
+ };
+ unsigned baseline, ref_count0, ref_count1;
+ int stream_fd;
+ uint32_t oa_report0[64];
+ uint32_t oa_report1[64];
+
+ /* This should be the first test before the first fixture so no drm_fd
+ * should have been opened so far...
+ */
+ igt_assert_eq(drm_fd, -1);
+
+ baseline = read_i915_module_ref();
+ igt_debug("baseline ref count (drm fd closed) = %u\n", baseline);
+
+ drm_fd = __drm_open_driver(DRIVER_INTEL);
+ devid = intel_get_drm_devid(drm_fd);
+ device = drm_get_card();
+
+ igt_require(IS_HASWELL(devid));
+ igt_require(lookup_hsw_render_basic_id());
+ properties[3] = hsw_render_basic_id;
+
+ ref_count0 = read_i915_module_ref();
+ igt_debug("initial ref count with drm_fd open = %u\n", ref_count0);
+ igt_assert(ref_count0 > baseline);
+
+ stream_fd = __perf_open(drm_fd, ¶m);
+ ref_count1 = read_i915_module_ref();
+ igt_debug("ref count after opening i915 perf stream = %u\n", ref_count1);
+ igt_assert(ref_count1 > ref_count0);
+
+ close(drm_fd);
+ drm_fd = -1;
+ ref_count0 = read_i915_module_ref();
+ igt_debug("ref count after closing drm fd = %u\n", ref_count0);
+
+ igt_assert(ref_count0 > baseline);
+
+ read_2_oa_reports(stream_fd,
+ I915_OA_FORMAT_A45_B8_C8,
+ oa_exponent,
+ oa_report0,
+ oa_report1,
+ false); /* not just timer reports */
+
+ close(stream_fd);
+ ref_count0 = read_i915_module_ref();
+ igt_debug("ref count after closing i915 perf stream fd = %u\n", ref_count0);
+ igt_assert_eq(ref_count0, baseline);
+}
+
+static void
+test_sysctl_defaults(void)
+{
+ int paranoid = read_u64_file("/proc/sys/dev/i915/perf_stream_paranoid");
+ int max_freq = read_u64_file("/proc/sys/dev/i915/oa_max_sample_rate");
+
+ igt_assert_eq(paranoid, 1);
+ igt_assert_eq(max_freq, 100000);
+}
+
+igt_main
+{
+ igt_skip_on_simulation();
+
+ igt_fixture {
+ struct stat sb;
+
+ igt_require(stat("/proc/sys/dev/i915/perf_stream_paranoid", &sb)
+ == 0);
+ igt_require(stat("/proc/sys/dev/i915/oa_max_sample_rate", &sb)
+ == 0);
+ }
+
+ igt_subtest("i915-ref-count")
+ test_i915_ref_count();
+
+ igt_subtest("sysctl-defaults")
+ test_sysctl_defaults();
+
+ igt_fixture {
+ /* We expect that the ref count test before these fixtures
+ * should have closed drm_fd...
+ */
+ igt_assert_eq(drm_fd, -1);
+ drm_fd = drm_open_driver_render(DRIVER_INTEL);
+ devid = intel_get_drm_devid(drm_fd);
+ device = drm_get_card();
+
+ igt_require(IS_HASWELL(devid));
+ igt_require(lookup_hsw_render_basic_id());
+
+ gt_frequency_range_save();
+
+ write_u64_file("/proc/sys/dev/i915/perf_stream_paranoid", 1);
+ write_u64_file("/proc/sys/dev/i915/oa_max_sample_rate", 100000);
+
+ render_copy = igt_get_render_copyfunc(devid);
+ igt_require_f(render_copy, "no render-copy function\n");
+ }
+
+ igt_subtest("non-system-wide-paranoid")
+ test_system_wide_paranoid();
+
+ igt_subtest("invalid-open-flags")
+ test_invalid_open_flags();
+
+ igt_subtest("invalid-oa-metric-set-id")
+ test_invalid_oa_metric_set_id();
+
+ igt_subtest("invalid-oa-format-id")
+ test_invalid_oa_format_id();
+
+ igt_subtest("missing-sample-flags")
+ test_missing_sample_flags();
+
+ igt_subtest("oa-formats")
+ test_oa_formats();
+
+ igt_subtest("invalid-oa-exponent")
+ test_invalid_oa_exponent();
+ igt_subtest("low-oa-exponent-permissions")
+ test_low_oa_exponent_permissions();
+ igt_subtest("oa-exponents") {
+ test_oa_exponents(450);
+ test_oa_exponents(550);
+ }
+
+ igt_subtest("per-context-mode-unprivileged")
+ test_per_context_mode_unprivileged();
+
+ igt_subtest("buffer-fill")
+ test_buffer_fill();
+
+ igt_subtest("disabled-read-error")
+ test_disabled_read_error();
+ igt_subtest("non-sampling-read-error")
+ test_non_sampling_read_error();
+
+ igt_subtest("enable-disable")
+ test_enable_disable();
+
+ igt_subtest("blocking")
+ test_blocking();
+
+ igt_subtest("polling")
+ test_polling();
+
+ igt_subtest("short-reads")
+ test_short_reads();
+
+ igt_subtest("mi-rpc")
+ test_mi_rpc();
+
+ igt_subtest("mi-rpc-per-ctx")
+ test_per_ctx_mi_rpc();
+
+ igt_subtest("rc6-disable")
+ test_rc6_disable();
+
+ igt_fixture {
+ /* leave sysctl options in their default state... */
+ write_u64_file("/proc/sys/dev/i915/oa_max_sample_rate", 100000);
+ write_u64_file("/proc/sys/dev/i915/perf_stream_paranoid", 1);
+
+ gt_frequency_range_restore();
+
+ close(drm_fd);
+ }
+}
--
2.10.1
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