diff options
Diffstat (limited to 'tests/i915/gem_reg_read.c')
| -rw-r--r-- | tests/i915/gem_reg_read.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/tests/i915/gem_reg_read.c b/tests/i915/gem_reg_read.c new file mode 100644 index 00000000..79facc1f --- /dev/null +++ b/tests/i915/gem_reg_read.c @@ -0,0 +1,175 @@ +/* + * 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); + } +} |