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/*
* 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 <time.h>
#include "igt.h"
IGT_TEST_DESCRIPTION("Basic check of ring<->ring write synchronisation.");
/*
* Testcase: Basic check of sync
*
* Extremely efficient at catching missed irqs
*/
static double gettime(void)
{
static clockid_t clock = -1;
struct timespec ts;
/* Stay on the same clock for consistency. */
if (clock != (clockid_t)-1) {
if (clock_gettime(clock, &ts))
goto error;
goto out;
}
#ifdef CLOCK_MONOTONIC_RAW
if (!clock_gettime(clock = CLOCK_MONOTONIC_RAW, &ts))
goto out;
#endif
#ifdef CLOCK_MONOTONIC_COARSE
if (!clock_gettime(clock = CLOCK_MONOTONIC_COARSE, &ts))
goto out;
#endif
if (!clock_gettime(clock = CLOCK_MONOTONIC, &ts))
goto out;
error:
igt_warn("Could not read monotonic time: %s\n",
strerror(errno));
igt_assert(0);
return 0;
out:
return ts.tv_sec + 1e-9*ts.tv_nsec;
}
static void
sync_ring(int fd, unsigned ring, int num_children)
{
unsigned engines[16];
const char *names[16];
int num_engines = 0;
if (ring == ~0u) {
const struct intel_execution_engine *e;
for (e = intel_execution_engines; e->name; e++) {
if (e->exec_id == 0)
continue;
if (!gem_has_ring(fd, e->exec_id | e->flags))
continue;
if (e->exec_id == I915_EXEC_BSD) {
int is_bsd2 = e->flags != 0;
if (gem_has_bsd2(fd) != is_bsd2)
continue;
}
names[num_engines] = e->name;
engines[num_engines++] = e->exec_id | e->flags;
if (num_engines == ARRAY_SIZE(engines))
break;
}
num_children *= num_engines;
} else {
gem_require_ring(fd, ring);
names[num_engines] = NULL;
engines[num_engines++] = ring;
}
intel_detect_and_clear_missed_interrupts(fd);
igt_fork(child, num_children) {
const uint32_t bbe = MI_BATCH_BUFFER_END;
struct drm_i915_gem_exec_object2 object;
struct drm_i915_gem_execbuffer2 execbuf;
double start, elapsed;
unsigned long cycles;
memset(&object, 0, sizeof(object));
object.handle = gem_create(fd, 4096);
gem_write(fd, object.handle, 0, &bbe, sizeof(bbe));
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (uintptr_t)&object;
execbuf.buffer_count = 1;
execbuf.flags = engines[child % num_engines];
gem_execbuf(fd, &execbuf);
start = gettime();
cycles = 0;
do {
do {
gem_execbuf(fd, &execbuf);
gem_sync(fd, object.handle);
} while (++cycles & 1023);
} while ((elapsed = gettime() - start) < SLOW_QUICK(10, 1));
igt_info("%s%sompleted %ld cycles: %.3f us\n",
names[child % num_engines] ?: "",
names[child % num_engines] ? " c" : "C",
cycles, elapsed*1e6/cycles);
gem_close(fd, object.handle);
}
igt_waitchildren_timeout(20, NULL);
igt_assert_eq(intel_detect_and_clear_missed_interrupts(fd), 0);
}
static void
sync_all(int fd, int num_children)
{
const struct intel_execution_engine *e;
unsigned engines[16];
int num_engines = 0;
for (e = intel_execution_engines; e->name; e++) {
if (e->exec_id == 0)
continue;
if (!gem_has_ring(fd, e->exec_id | e->flags))
continue;
if (e->exec_id == I915_EXEC_BSD) {
int is_bsd2 = e->flags != 0;
if (gem_has_bsd2(fd) != is_bsd2)
continue;
}
engines[num_engines++] = e->exec_id | e->flags;
if (num_engines == ARRAY_SIZE(engines))
break;
}
igt_require(num_engines);
intel_detect_and_clear_missed_interrupts(fd);
igt_fork(child, num_children) {
const uint32_t bbe = MI_BATCH_BUFFER_END;
struct drm_i915_gem_exec_object2 object;
struct drm_i915_gem_execbuffer2 execbuf;
double start, elapsed;
unsigned long cycles;
memset(&object, 0, sizeof(object));
object.handle = gem_create(fd, 4096);
gem_write(fd, object.handle, 0, &bbe, sizeof(bbe));
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (uintptr_t)&object;
execbuf.buffer_count = 1;
gem_execbuf(fd, &execbuf);
start = gettime();
cycles = 0;
do {
do {
for (int n = 0; n < num_engines; n++) {
execbuf.flags = engines[n];
gem_execbuf(fd, &execbuf);
}
gem_sync(fd, object.handle);
} while (++cycles & 1023);
} while ((elapsed = gettime() - start) < SLOW_QUICK(10, 1));
igt_info("Completed %ld cycles: %.3f us\n",
cycles, elapsed*1e6/cycles);
gem_close(fd, object.handle);
}
igt_waitchildren_timeout(20, NULL);
igt_assert_eq(intel_detect_and_clear_missed_interrupts(fd), 0);
}
igt_main
{
const struct intel_execution_engine *e;
const int ncpus = sysconf(_SC_NPROCESSORS_ONLN);
int fd = -1;
igt_skip_on_simulation();
igt_fixture
fd = drm_open_driver(DRIVER_INTEL);
igt_fork_hang_detector(fd);
for (e = intel_execution_engines; e->name; e++) {
igt_subtest_f("basic-%s", e->name)
sync_ring(fd, e->exec_id | e->flags, 1);
igt_subtest_f("forked-%s", e->name)
sync_ring(fd, e->exec_id | e->flags, ncpus);
}
igt_subtest("basic-each")
sync_ring(fd, ~0u, 1);
igt_subtest("forked-each")
sync_ring(fd, ~0u, ncpus);
igt_subtest("basic-all")
sync_all(fd, 1);
igt_subtest("forked-all")
sync_all(fd, ncpus);
igt_stop_hang_detector();
igt_fixture
close(fd);
}
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