| /* |
| * Copyright © 2012 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. |
| * |
| * Authors: |
| * Ben Widawsky <ben@bwidawsk.net> |
| * |
| */ |
| |
| #include "igt.h" |
| #include <stdio.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <sys/utsname.h> |
| #include <time.h> |
| |
| |
| static bool is_x86_64; |
| static bool has_proper_timestamp; |
| |
| struct local_drm_i915_reg_read { |
| __u64 offset; |
| __u64 val; /* Return value */ |
| }; |
| |
| #define REG_READ_IOCTL DRM_IOWR(DRM_COMMAND_BASE + 0x31, struct local_drm_i915_reg_read) |
| |
| #define RENDER_RING_TIMESTAMP 0x2358 |
| |
| static int read_register(int fd, uint64_t offset, uint64_t * val) |
| { |
| int ret = 0; |
| struct local_drm_i915_reg_read reg_read; |
| reg_read.offset = offset; |
| |
| if (drmIoctl(fd, REG_READ_IOCTL, ®_read)) |
| ret = -errno; |
| |
| *val = reg_read.val; |
| |
| return ret; |
| } |
| |
| static bool check_kernel_x86_64(void) |
| { |
| int ret; |
| struct utsname uts; |
| |
| ret = uname(&uts); |
| igt_assert_eq(ret, 0); |
| |
| if (!strcmp(uts.machine, "x86_64")) |
| return true; |
| |
| return false; |
| } |
| |
| static bool check_timestamp(int fd) |
| { |
| int ret; |
| uint64_t val; |
| |
| ret = read_register(fd, RENDER_RING_TIMESTAMP | 1, &val); |
| |
| return ret == 0; |
| } |
| |
| static int timer_query(int fd, uint64_t * val) |
| { |
| uint64_t offset; |
| int ret; |
| |
| offset = RENDER_RING_TIMESTAMP; |
| if (has_proper_timestamp) |
| offset |= 1; |
| |
| ret = read_register(fd, offset, val); |
| |
| /* |
| * When reading the timestamp register with single 64b read, we are observing |
| * invalid values on x86_64: |
| * |
| * [f = valid counter value | X = garbage] |
| * |
| * i386: 0x0000000fffffffff |
| * x86_64: 0xffffffffXXXXXXXX |
| * |
| * In the absence of a corrected register read ioctl, attempt |
| * to fix up the return value to be vaguely useful. |
| */ |
| |
| if (is_x86_64 && !has_proper_timestamp) |
| *val >>= 32; |
| |
| return ret; |
| } |
| |
| static void test_timestamp_moving(int fd) |
| { |
| uint64_t first_val, second_val; |
| |
| igt_fail_on(timer_query(fd, &first_val) != 0); |
| sleep(1); |
| igt_fail_on(timer_query(fd, &second_val) != 0); |
| igt_assert(second_val != first_val); |
| } |
| |
| static void test_timestamp_monotonic(int fd) |
| { |
| uint64_t first_val, second_val; |
| time_t start; |
| bool retry = true; |
| |
| igt_fail_on(timer_query(fd, &first_val) != 0); |
| time(&start); |
| do { |
| retry: |
| igt_fail_on(timer_query(fd, &second_val) != 0); |
| if (second_val < first_val && retry) { |
| /* We may hit timestamp overflow once */ |
| retry = false; |
| first_val = second_val; |
| goto retry; |
| } |
| igt_assert(second_val >= first_val); |
| } while(difftime(time(NULL), start) < 5); |
| |
| } |
| |
| igt_main |
| { |
| uint64_t val = 0; |
| int fd = -1; |
| |
| igt_fixture { |
| fd = drm_open_driver(DRIVER_INTEL); |
| is_x86_64 = check_kernel_x86_64(); |
| has_proper_timestamp = check_timestamp(fd); |
| } |
| |
| igt_subtest("bad-register") |
| igt_assert_eq(read_register(fd, 0x12345678, &val), -EINVAL); |
| |
| igt_subtest("timestamp-moving") { |
| igt_skip_on(timer_query(fd, &val) != 0); |
| test_timestamp_moving(fd); |
| } |
| |
| igt_subtest("timestamp-monotonic") { |
| igt_skip_on(timer_query(fd, &val) != 0); |
| test_timestamp_monotonic(fd); |
| } |
| |
| igt_fixture { |
| close(fd); |
| } |
| } |