static void rtprio(pthread_attr_t *attr, int prio)
{
#ifdef PTHREAD_EXPLICIT_SCHED
struct sched_param param = { .sched_priority = 99 };
pthread_attr_setinheritsched(attr, PTHREAD_EXPLICIT_SCHED);
pthread_attr_setschedpolicy(attr, SCHED_FIFO);
pthread_attr_setschedparam(attr, ¶m);
#endif
}
static double l_estimate(igt_stats_t *stats)
{
if (stats->n_values > 9)
return igt_stats_get_trimean(stats);
else if (stats->n_values > 5)
return igt_stats_get_median(stats);
else
return igt_stats_get_mean(stats);
}
static double min_measurement_error(void)
{
struct timespec start, end;
int n;
clock_gettime(CLOCK_MONOTONIC, &start);
for (n = 0; n < 1024; n++)
clock_gettime(CLOCK_MONOTONIC, &end);
return elapsed(&start, &end) / n;
}
int main(int argc, char **argv)
{
struct gem_busyspin *busy;
struct sys_wait *wait;
pthread_attr_t attr;
int ncpus = sysconf(_SC_NPROCESSORS_ONLN);
igt_stats_t cycles, mean, max;
double min;
int time = 10;
int field = -1;
int enable_gem_sysbusy = 1;
int n, c;
while ((c = getopt(argc, argv, "t:f:n")) != -1) {
switch (c) {
case 'n': /* dry run, measure baseline system latency */
enable_gem_sysbusy = 0;
break;
case 't':
/* How long to run the benchmark for (seconds) */
time = atoi(optarg);
if (time < 0)
time = INT_MAX;
break;
case 'f':
/* Select an output field */
field = atoi(optarg);
break;
default:
break;
}
}
/* Prevent CPU sleeps so that busy and idle loads are consistent. */
force_low_latency();
min = min_measurement_error();
busy = calloc(ncpus, sizeof(*busy));
pthread_attr_init(&attr);
if (enable_gem_sysbusy) {
for (n = 0; n < ncpus; n++) {
bind_cpu(&attr, n);
pthread_create(&busy[n].thread, &attr,
gem_busyspin, &busy[n]);
}
}
wait = calloc(ncpus, sizeof(*wait));
pthread_attr_init(&attr);
rtprio(&attr, 99);
for (n = 0; n < ncpus; n++) {
igt_mean_init(&wait[n].mean);
bind_cpu(&attr, n);
pthread_create(&wait[n].thread, &attr, sys_wait, &wait[n]);
}
sleep(time);
done = 1;
igt_stats_init_with_size(&cycles, ncpus);
if (enable_gem_sysbusy) {
for (n = 0; n < ncpus; n++) {
pthread_join(busy[n].thread, NULL);
igt_stats_push(&cycles, busy[n].count);
}
}
igt_stats_init_with_size(&mean, ncpus);
igt_stats_init_with_size(&max, ncpus);
for (n = 0; n < ncpus; n++) {
pthread_join(wait[n].thread, NULL);
igt_stats_push_float(&mean, wait[n].mean.mean);
igt_stats_push_float(&max, wait[n].mean.max);
}
switch (field) {
default:
printf("gem_syslatency: cycles=%.0f, latency mean=%.3fus max=%.0fus\n",
igt_stats_get_mean(&cycles),
(igt_stats_get_mean(&mean) - min)/ 1000,
(l_estimate(&max) - min) / 1000);
break;
case 0:
printf("%.0f\n", igt_stats_get_mean(&cycles));
break;
case 1:
printf("%.3f\n", (igt_stats_get_mean(&mean) - min) / 1000);
break;
case 2:
printf("%.0f\n", (l_estimate(&max) - min) / 1000);
break;
}
return 0;
}
int main(int argc, char **argv)
{
int fd = drm_open_driver(DRIVER_INTEL);
enum map {CPU, GTT, WC} map = CPU;
enum dir {READ, WRITE, CLEAR, FAULT} dir = READ;
int tiling = I915_TILING_NONE;
void *buf = malloc(OBJECT_SIZE);
uint32_t handle;
void *ptr, *src, *dst;
int reps = 13;
int c, size;
while ((c = getopt (argc, argv, "m:d:r:t:")) != -1) {
switch (c) {
case 'm':
if (strcmp(optarg, "cpu") == 0)
map = CPU;
else if (strcmp(optarg, "gtt") == 0)
map = GTT;
else if (strcmp(optarg, "wc") == 0)
map = WC;
else
abort();
break;
case 'd':
if (strcmp(optarg, "read") == 0)
dir = READ;
else if (strcmp(optarg, "write") == 0)
dir = WRITE;
else if (strcmp(optarg, "clear") == 0)
dir = CLEAR;
else if (strcmp(optarg, "fault") == 0)
dir = FAULT;
else
abort();
break;
case 't':
if (strcmp(optarg, "x") == 0)
tiling = I915_TILING_X;
else if (strcmp(optarg, "y") == 0)
tiling = I915_TILING_Y;
else if (strcmp(optarg, "none") == 0)
tiling = I915_TILING_NONE;
else
abort();
break;
case 'r':
reps = atoi(optarg);
if (reps < 1)
reps = 1;
break;
default:
break;
}
}
handle = gem_create(fd, OBJECT_SIZE);
switch (map) {
case CPU:
ptr = gem_mmap__cpu(fd, handle, 0, OBJECT_SIZE, PROT_WRITE);
gem_set_domain(fd, handle, I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
break;
case GTT:
ptr = gem_mmap__gtt(fd, handle, OBJECT_SIZE, PROT_WRITE);
gem_set_domain(fd, handle, I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
break;
case WC:
ptr = gem_mmap__wc(fd, handle, 0, OBJECT_SIZE, PROT_WRITE);
gem_set_domain(fd, handle, I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
break;
default:
abort();
}
gem_set_tiling(fd, handle, tiling, 512);
if (dir == READ) {
src = ptr;
dst = buf;
} else {
src = buf;
dst = ptr;
}
for (size = 1; size <= OBJECT_SIZE; size <<= 1) {
igt_stats_t stats;
int n;
igt_stats_init_with_size(&stats, reps);
for (n = 0; n < reps; n++) {
struct timespec start, end;
int page;
clock_gettime(CLOCK_MONOTONIC, &start);
switch (dir) {
case CLEAR:
memset(dst, 0, size);
break;
case FAULT:
for (page = 0; page < OBJECT_SIZE; page += 4096) {
uint32_t *x = (uint32_t *)ptr + page/4;
page += *x; /* should be zero! */
}
break;
default:
memcpy(dst, src, size);
break;
}
clock_gettime(CLOCK_MONOTONIC, &end);
igt_stats_push(&stats, elapsed(&start, &end));
}
printf("%7.3f\n", igt_stats_get_trimean(&stats)/1000);
igt_stats_fini(&stats);
}
return 0;
}
int main(int argc, char **argv)
{
int fd = drm_open_driver(DRIVER_INTEL);
int domain = I915_GEM_DOMAIN_GTT;
enum dir { READ, WRITE } dir = READ;
void *buf = malloc(OBJECT_SIZE);
uint32_t handle;
int reps = 13;
int c, size;
while ((c = getopt (argc, argv, "D:d:r:")) != -1) {
switch (c) {
case 'd':
if (strcmp(optarg, "cpu") == 0)
domain = I915_GEM_DOMAIN_CPU;
else if (strcmp(optarg, "gtt") == 0)
domain = I915_GEM_DOMAIN_GTT;
break;
case 'D':
if (strcmp(optarg, "read") == 0)
dir = READ;
else if (strcmp(optarg, "write") == 0)
dir = WRITE;
else
abort();
break;
case 'r':
reps = atoi(optarg);
if (reps < 1)
reps = 1;
break;
default:
break;
}
}
handle = gem_create(fd, OBJECT_SIZE);
for (size = 1; size <= OBJECT_SIZE; size <<= 1) {
igt_stats_t stats;
int n;
igt_stats_init_with_size(&stats, reps);
for (n = 0; n < reps; n++) {
struct timespec start, end;
gem_set_domain(fd, handle, domain, domain);
clock_gettime(CLOCK_MONOTONIC, &start);
if (dir == READ)
gem_read(fd, handle, 0, buf, size);
else
gem_write(fd, handle, 0, buf, size);
clock_gettime(CLOCK_MONOTONIC, &end);
igt_stats_push(&stats, elapsed(&start, &end));
}
printf("%7.3f\n", igt_stats_get_trimean(&stats)/1000);
igt_stats_fini(&stats);
}
return 0;
}