1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
|
/*
* Copyright © 2013 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 <inttypes.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/sysmacros.h>
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <i915_drm.h>
#include "drmtest.h"
#include "igt_aux.h"
#include "igt_kms.h"
#include "igt_debugfs.h"
#include "igt_sysfs.h"
/**
* SECTION:igt_debugfs
* @short_description: Support code for debugfs features
* @title: debugfs
* @include: igt.h
*
* This library provides helpers to access debugfs features. On top of some
* basic functions to access debugfs files with e.g. igt_debugfs_open() it also
* provides higher-level wrappers for some debugfs features.
*
* # Pipe CRC Support
*
* This library wraps up the kernel's support for capturing pipe CRCs into a
* neat and tidy package. For the detailed usage see all the functions which
* work on #igt_pipe_crc_t. This is supported on all platforms and outputs.
*
* Actually using pipe CRCs to write modeset tests is a bit tricky though, so
* there is no way to directly check a CRC: Both the details of the plane
* blending, color correction and other hardware and how exactly the CRC is
* computed at each tap point vary by hardware generation and are not disclosed.
*
* The only way to use #igt_crc_t CRCs therefore is to compare CRCs among each
* another either for equality or difference. Otherwise CRCs must be treated as
* completely opaque values. Note that not even CRCs from different pipes or tap
* points on the same platform can be compared. Hence only use
* igt_assert_crc_equal() to inspect CRC values captured by the same
* #igt_pipe_crc_t object.
*
* # Other debugfs interface wrappers
*
* This covers the miscellaneous debugfs interface wrappers:
*
* - drm/i915 supports interfaces to evict certain classes of gem buffer
* objects, see igt_drop_caches_set().
*
* - drm/i915 supports an interface to disable prefaulting, useful to test
* slow paths in ioctls. See igt_disable_prefault().
*/
/*
* General debugfs helpers
*/
static bool is_mountpoint(const char *path)
{
char buf[strlen(path) + 4];
struct stat st;
dev_t dev;
igt_assert_lt(snprintf(buf, sizeof(buf), "%s/.", path), sizeof(buf));
if (stat(buf, &st))
return false;
if (!S_ISDIR(st.st_mode))
return false;
dev = st.st_dev;
igt_assert_lt(snprintf(buf, sizeof(buf), "%s/..", path), sizeof(buf));
if (stat(buf, &st))
return false;
if (!S_ISDIR(st.st_mode))
return false;
return dev != st.st_dev;
}
static const char *__igt_debugfs_mount(void)
{
if (is_mountpoint("/sys/kernel/debug"))
return "/sys/kernel/debug";
if (is_mountpoint("/debug"))
return "/debug";
if (mount("debug", "/sys/kernel/debug", "debugfs", 0, 0))
return NULL;
return "/sys/kernel/debug";
}
/**
* igt_debugfs_mount:
*
* This attempts to locate where debugfs is mounted on the filesystem,
* and if not found, will then try to mount debugfs at /sys/kernel/debug.
*
* Returns:
* The path to the debugfs mount point (e.g. /sys/kernel/debug)
*/
const char *igt_debugfs_mount(void)
{
static const char *path;
if (!path)
path = __igt_debugfs_mount();
return path;
}
/**
* igt_debugfs_path:
* @device: fd of the device
* @path: buffer to store path
* @pathlen: len of @path buffer.
*
* This finds the debugfs directory corresponding to @device.
*
* Returns:
* The directory path, or NULL on failure.
*/
char *igt_debugfs_path(int device, char *path, int pathlen)
{
struct stat st;
const char *debugfs_root;
int idx;
debugfs_root = igt_debugfs_mount();
igt_assert(debugfs_root);
memset(&st, 0, sizeof(st));
if (device != -1) { /* if no fd, we presume we want dri/0 */
if (fstat(device, &st)) {
igt_debug("Couldn't stat FD for DRM device: %m\n");
return NULL;
}
if (!S_ISCHR(st.st_mode)) {
igt_debug("FD for DRM device not a char device!\n");
return NULL;
}
}
idx = minor(st.st_rdev);
snprintf(path, pathlen, "%s/dri/%d/name", debugfs_root, idx);
if (stat(path, &st))
return NULL;
if (idx >= 64) {
int file, name_len, cmp_len;
char name[100], cmp[100];
file = open(path, O_RDONLY);
if (file < 0)
return NULL;
name_len = read(file, name, sizeof(name));
close(file);
for (idx = 0; idx < 16; idx++) {
snprintf(path, pathlen, "%s/dri/%d/name",
debugfs_root, idx);
file = open(path, O_RDONLY);
if (file < 0)
return NULL;
cmp_len = read(file, cmp, sizeof(cmp));
close(file);
if (cmp_len == name_len && !memcmp(cmp, name, name_len))
break;
}
if (idx == 16)
return NULL;
}
snprintf(path, pathlen, "%s/dri/%d", debugfs_root, idx);
return path;
}
/**
* igt_debugfs_dir:
* @device: fd of the device
*
* This opens the debugfs directory corresponding to device for use
* with igt_sysfs_get() and related functions.
*
* Returns:
* The directory fd, or -1 on failure.
*/
int igt_debugfs_dir(int device)
{
char path[200];
if (!igt_debugfs_path(device, path, sizeof(path)))
return -1;
igt_debug("Opening debugfs directory '%s'\n", path);
return open(path, O_RDONLY);
}
/**
* igt_debugfs_open:
* @filename: name of the debugfs node to open
* @mode: mode bits as used by open()
*
* This opens a debugfs file as a Unix file descriptor. The filename should be
* relative to the drm device's root, i.e. without "drm/$minor".
*
* Returns:
* The Unix file descriptor for the debugfs file or -1 if that didn't work out.
*/
int igt_debugfs_open(int device, const char *filename, int mode)
{
int dir, ret;
dir = igt_debugfs_dir(device);
if (dir < 0)
return dir;
ret = openat(dir, filename, mode);
close(dir);
return ret;
}
/**
* __igt_debugfs_read:
* @filename: file name
* @buf: buffer where the contents will be stored, allocated by the caller
* @buf_size: size of the buffer
*
* This function opens the debugfs file, reads it, stores the content in the
* provided buffer, then closes the file. Users should make sure that the buffer
* provided is big enough to fit the whole file, plus one byte.
*/
void __igt_debugfs_read(int fd, const char *filename, char *buf, int buf_size)
{
int dir;
int len;
dir = igt_debugfs_dir(fd);
len = igt_sysfs_read(dir, filename, buf, buf_size - 1);
if (len < 0)
len = 0;
buf[len] = '\0';
close(dir);
}
/**
* igt_debugfs_search:
* @filename: file name
* @substring: string to search for in @filename
*
* Searches each line in @filename for the substring specified in @substring.
*
* Returns: True if the @substring is found to occur in @filename
*/
bool igt_debugfs_search(int device, const char *filename, const char *substring)
{
FILE *file;
size_t n = 0;
char *line = NULL;
bool matched = false;
int fd;
fd = igt_debugfs_open(device, filename, O_RDONLY);
file = fdopen(fd, "r");
igt_assert(file);
while (getline(&line, &n, file) >= 0) {
matched = strstr(line, substring) != NULL;
if (matched)
break;
}
free(line);
fclose(file);
close(fd);
return matched;
}
/*
* Pipe CRC
*/
static bool igt_find_crc_mismatch(const igt_crc_t *a, const igt_crc_t *b,
int *index)
{
int nwords = min(a->n_words, b->n_words);
int i;
for (i = 0; i < nwords; i++) {
if (a->crc[i] != b->crc[i]) {
if (index)
*index = i;
return true;
}
}
if (a->n_words != b->n_words) {
if (index)
*index = i;
return true;
}
return false;
}
/**
* igt_assert_crc_equal:
* @a: first pipe CRC value
* @b: second pipe CRC value
*
* Compares two CRC values and fails the testcase if they don't match with
* igt_fail(). Note that due to CRC collisions CRC based testcase can only
* assert that CRCs match, never that they are different. Otherwise there might
* be random testcase failures when different screen contents end up with the
* same CRC by chance.
*/
void igt_assert_crc_equal(const igt_crc_t *a, const igt_crc_t *b)
{
int index;
bool mismatch;
mismatch = igt_find_crc_mismatch(a, b, &index);
if (mismatch)
igt_debug("CRC mismatch at index %d: 0x%x != 0x%x\n", index,
a->crc[index], b->crc[index]);
igt_assert(!mismatch);
}
/**
* igt_check_crc_equal:
* @a: first pipe CRC value
* @b: second pipe CRC value
*
* Compares two CRC values and return whether they match.
*
* Returns: A boolean indicating whether the CRC values match
*/
bool igt_check_crc_equal(const igt_crc_t *a, const igt_crc_t *b)
{
int index;
bool mismatch;
mismatch = igt_find_crc_mismatch(a, b, &index);
if (mismatch)
igt_debug("CRC mismatch at index %d: 0x%x != 0x%x\n", index,
a->crc[index], b->crc[index]);
return !mismatch;
}
/**
* igt_crc_to_string_extended:
* @crc: pipe CRC value to print
* @delimiter: The delimiter to use between crc words
* @crc_size: the number of bytes to print per crc word (between 1 and 4)
*
* This function allocates a string and formats @crc into it, depending on
* @delimiter and @crc_size.
* The caller is responsible for freeing the string.
*
* This should only ever be used for diagnostic debug output.
*/
char *igt_crc_to_string_extended(igt_crc_t *crc, char delimiter, int crc_size)
{
int i;
int len = 0;
int field_width = 2 * crc_size; /* Two chars per byte. */
char *buf = malloc((field_width+1) * crc->n_words * sizeof(char));
if (!buf)
return NULL;
for (i = 0; i < crc->n_words; i++)
len += sprintf(buf + len, "%0*x%c", field_width,
crc->crc[i], delimiter);
/* Eat the last delimiter */
buf[len - 1] = '\0';
return buf;
}
/**
* igt_crc_to_string:
* @crc: pipe CRC value to print
*
* This function allocates a string and formats @crc into it.
* The caller is responsible for freeing the string.
*
* This should only ever be used for diagnostic debug output.
*/
char *igt_crc_to_string(igt_crc_t *crc)
{
return igt_crc_to_string_extended(crc, ' ', 4);
}
#define MAX_CRC_ENTRIES 10
#define MAX_LINE_LEN (10 + 11 * MAX_CRC_ENTRIES + 1)
struct _igt_pipe_crc {
int fd;
int dir;
int ctl_fd;
int crc_fd;
int flags;
enum pipe pipe;
enum intel_pipe_crc_source source;
};
static const char *pipe_crc_sources[] = {
"none",
"plane1",
"plane2",
"pf",
"pipe",
"TV",
"DP-B",
"DP-C",
"DP-D",
"auto"
};
static const char *pipe_crc_source_name(enum intel_pipe_crc_source source)
{
return pipe_crc_sources[source];
}
/**
* igt_require_pipe_crc:
*
* Convenience helper to check whether pipe CRC capturing is supported by the
* kernel. Uses igt_skip to automatically skip the test/subtest if this isn't
* the case.
*/
void igt_require_pipe_crc(int fd)
{
int dir;
struct stat stat;
dir = igt_debugfs_dir(fd);
igt_require_f(dir >= 0, "Could not open debugfs directory\n");
igt_require_f(fstatat(dir, "crtc-0/crc/control", &stat, 0) == 0,
"CRCs not supported on this platform\n");
close(dir);
}
static void igt_hpd_storm_exit_handler(int sig)
{
int fd = drm_open_driver(DRIVER_INTEL);
/* Here we assume that only one i915 device will be ever present */
igt_hpd_storm_reset(fd);
close(fd);
}
/**
* igt_hpd_storm_set_threshold:
* @threshold: How many hotplugs per second required to trigger an HPD storm,
* or 0 to disable storm detection.
*
* Convienence helper to configure the HPD storm detection threshold for i915
* through debugfs. Useful for hotplugging tests where HPD storm detection
* might get in the way and slow things down.
*
* If the system does not support HPD storm detection, this function does
* nothing.
*
* See: https://01.org/linuxgraphics/gfx-docs/drm/gpu/i915.html#hotplug
*/
void igt_hpd_storm_set_threshold(int drm_fd, unsigned int threshold)
{
int fd = igt_debugfs_open(drm_fd, "i915_hpd_storm_ctl", O_WRONLY);
char buf[16];
if (fd < 0)
return;
igt_debug("Setting HPD storm threshold to %d\n", threshold);
snprintf(buf, sizeof(buf), "%d", threshold);
igt_assert_eq(write(fd, buf, strlen(buf)), strlen(buf));
close(fd);
igt_install_exit_handler(igt_hpd_storm_exit_handler);
}
/**
* igt_hpd_storm_reset:
*
* Convienence helper to reset HPD storm detection to it's default settings.
* If hotplug detection was disabled on any ports due to an HPD storm, it will
* be immediately re-enabled. Always called on exit if the HPD storm detection
* threshold was modified during any tests.
*
* If the system does not support HPD storm detection, this function does
* nothing.
*
* See: https://01.org/linuxgraphics/gfx-docs/drm/gpu/i915.html#hotplug
*/
void igt_hpd_storm_reset(int drm_fd)
{
int fd = igt_debugfs_open(drm_fd, "i915_hpd_storm_ctl", O_WRONLY);
const char *buf = "reset";
if (fd < 0)
return;
igt_debug("Resetting HPD storm threshold\n");
igt_assert_eq(write(fd, buf, strlen(buf)), strlen(buf));
close(fd);
}
/**
* igt_hpd_storm_detected:
*
* Checks whether or not i915 has detected an HPD interrupt storm on any of the
* system's ports.
*
* This function always returns false on systems that do not support HPD storm
* detection.
*
* See: https://01.org/linuxgraphics/gfx-docs/drm/gpu/i915.html#hotplug
*
* Returns: Whether or not an HPD storm has been detected.
*/
bool igt_hpd_storm_detected(int drm_fd)
{
int fd = igt_debugfs_open(drm_fd, "i915_hpd_storm_ctl", O_RDONLY);
char *start_loc;
char buf[32] = {0}, detected_str[4];
bool ret;
if (fd < 0)
return false;
igt_assert_lt(0, read(fd, buf, sizeof(buf)));
igt_assert(start_loc = strstr(buf, "Detected: "));
igt_assert_eq(sscanf(start_loc, "Detected: %s\n", detected_str), 1);
if (strcmp(detected_str, "yes") == 0)
ret = true;
else if (strcmp(detected_str, "no") == 0)
ret = false;
else
igt_fail_on_f(true, "Unknown hpd storm detection status '%s'\n",
detected_str);
close(fd);
return ret;
}
/**
* igt_require_hpd_storm_ctl:
*
* Skips the current test if the system does not have HPD storm detection.
*
* See: https://01.org/linuxgraphics/gfx-docs/drm/gpu/i915.html#hotplug
*/
void igt_require_hpd_storm_ctl(int drm_fd)
{
int fd = igt_debugfs_open(drm_fd, "i915_hpd_storm_ctl", O_RDONLY);
igt_require_f(fd > 0, "No i915_hpd_storm_ctl found in debugfs\n");
close(fd);
}
static igt_pipe_crc_t *
pipe_crc_new(int fd, enum pipe pipe, enum intel_pipe_crc_source source, int flags)
{
igt_pipe_crc_t *pipe_crc;
char buf[128];
int debugfs;
debugfs = igt_debugfs_dir(fd);
igt_assert(debugfs != -1);
pipe_crc = calloc(1, sizeof(struct _igt_pipe_crc));
sprintf(buf, "crtc-%d/crc/control", pipe);
pipe_crc->ctl_fd = openat(debugfs, buf, O_WRONLY);
igt_assert(pipe_crc->ctl_fd != -1);
pipe_crc->crc_fd = -1;
pipe_crc->fd = fd;
pipe_crc->dir = debugfs;
pipe_crc->pipe = pipe;
pipe_crc->source = source;
pipe_crc->flags = flags;
return pipe_crc;
}
/**
* igt_pipe_crc_new:
* @pipe: display pipe to use as source
* @source: CRC tap point to use as source
*
* This sets up a new pipe CRC capture object for the given @pipe and @source
* in blocking mode.
*
* Returns: A pipe CRC object for the given @pipe and @source. The library
* assumes that the source is always available since recent kernels support at
* least INTEL_PIPE_CRC_SOURCE_AUTO everywhere.
*/
igt_pipe_crc_t *
igt_pipe_crc_new(int fd, enum pipe pipe, enum intel_pipe_crc_source source)
{
return pipe_crc_new(fd, pipe, source, O_RDONLY);
}
/**
* igt_pipe_crc_new_nonblock:
* @pipe: display pipe to use as source
* @source: CRC tap point to use as source
*
* This sets up a new pipe CRC capture object for the given @pipe and @source
* in nonblocking mode.
*
* Returns: A pipe CRC object for the given @pipe and @source. The library
* assumes that the source is always available since recent kernels support at
* least INTEL_PIPE_CRC_SOURCE_AUTO everywhere.
*/
igt_pipe_crc_t *
igt_pipe_crc_new_nonblock(int fd, enum pipe pipe, enum intel_pipe_crc_source source)
{
return pipe_crc_new(fd, pipe, source, O_RDONLY | O_NONBLOCK);
}
/**
* igt_pipe_crc_free:
* @pipe_crc: pipe CRC object
*
* Frees all resources associated with @pipe_crc.
*/
void igt_pipe_crc_free(igt_pipe_crc_t *pipe_crc)
{
if (!pipe_crc)
return;
close(pipe_crc->ctl_fd);
close(pipe_crc->crc_fd);
close(pipe_crc->dir);
free(pipe_crc);
}
static bool pipe_crc_init_from_string(igt_pipe_crc_t *pipe_crc, igt_crc_t *crc,
const char *line)
{
int i;
const char *buf;
if (strncmp(line, "XXXXXXXXXX", 10) == 0)
crc->has_valid_frame = false;
else {
crc->has_valid_frame = true;
crc->frame = strtoul(line, NULL, 16);
}
buf = line + 10;
for (i = 0; *buf != '\n'; i++, buf += 11)
crc->crc[i] = strtoul(buf, NULL, 16);
crc->n_words = i;
return true;
}
static int read_crc(igt_pipe_crc_t *pipe_crc, igt_crc_t *out)
{
ssize_t bytes_read;
char buf[MAX_LINE_LEN + 1];
igt_set_timeout(5, "CRC reading");
bytes_read = read(pipe_crc->crc_fd, &buf, MAX_LINE_LEN);
igt_reset_timeout();
if (bytes_read < 0)
bytes_read = -errno;
else
buf[bytes_read] = '\0';
if (bytes_read > 0 && !pipe_crc_init_from_string(pipe_crc, out, buf))
return -EINVAL;
return bytes_read;
}
static void read_one_crc(igt_pipe_crc_t *pipe_crc, igt_crc_t *out)
{
int ret;
while ((ret = read_crc(pipe_crc, out)) <= 0 && ret != -EINVAL)
usleep(1000);
}
/**
* igt_pipe_crc_start:
* @pipe_crc: pipe CRC object
*
* Starts the CRC capture process on @pipe_crc.
*/
void igt_pipe_crc_start(igt_pipe_crc_t *pipe_crc)
{
const char *src = pipe_crc_source_name(pipe_crc->source);
char buf[32];
/* Stop first just to make sure we don't have lingering state left. */
igt_pipe_crc_stop(pipe_crc);
igt_assert_eq(write(pipe_crc->ctl_fd, src, strlen(src)), strlen(src));
sprintf(buf, "crtc-%d/crc/data", pipe_crc->pipe);
pipe_crc->crc_fd = openat(pipe_crc->dir, buf, pipe_crc->flags);
igt_assert(pipe_crc->crc_fd != -1);
errno = 0;
}
/**
* igt_pipe_crc_stop:
* @pipe_crc: pipe CRC object
*
* Stops the CRC capture process on @pipe_crc.
*/
void igt_pipe_crc_stop(igt_pipe_crc_t *pipe_crc)
{
close(pipe_crc->crc_fd);
pipe_crc->crc_fd = -1;
}
/**
* igt_pipe_crc_get_crcs:
* @pipe_crc: pipe CRC object
* @n_crcs: number of CRCs to capture
* @out_crcs: buffer pointer for the captured CRC values
*
* Read up to @n_crcs from @pipe_crc. This function does not block, and will
* return early if not enough CRCs can be captured, if @pipe_crc has been
* opened using igt_pipe_crc_new_nonblock(). It will block until @n_crcs are
* retrieved if @pipe_crc has been opened using igt_pipe_crc_new(). @out_crcs is
* alloced by this function and must be released with free() by the caller.
*
* Callers must start and stop the capturing themselves by calling
* igt_pipe_crc_start() and igt_pipe_crc_stop(). For one-shot CRC collecting
* look at igt_pipe_crc_collect_crc().
*
* Returns:
* The number of CRCs captured. Should be equal to @n_crcs in blocking mode, but
* can be less (even zero) in non-blocking mode.
*/
int
igt_pipe_crc_get_crcs(igt_pipe_crc_t *pipe_crc, int n_crcs,
igt_crc_t **out_crcs)
{
igt_crc_t *crcs;
int n = 0;
crcs = calloc(n_crcs, sizeof(igt_crc_t));
do {
igt_crc_t *crc = &crcs[n];
int ret;
ret = read_crc(pipe_crc, crc);
if (ret == -EAGAIN)
break;
if (ret < 0)
continue;
n++;
} while (n < n_crcs);
*out_crcs = crcs;
return n;
}
static void crc_sanity_checks(igt_crc_t *crc)
{
int i;
bool all_zero = true;
for (i = 0; i < crc->n_words; i++) {
igt_warn_on_f(crc->crc[i] == 0xffffffff,
"Suspicious CRC: it looks like the CRC "
"read back was from a register in a powered "
"down well\n");
if (crc->crc[i])
all_zero = false;
}
igt_warn_on_f(all_zero, "Suspicious CRC: All values are 0.\n");
}
/**
* igt_pipe_crc_collect_crc:
* @pipe_crc: pipe CRC object
* @out_crc: buffer for the captured CRC values
*
* Read a single CRC from @pipe_crc. This function blocks until the CRC is
* retrieved, irrespective of whether @pipe_crc has been opened with
* igt_pipe_crc_new() or igt_pipe_crc_new_nonblock(). @out_crc must be
* allocated by the caller.
*
* This function takes care of the pipe_crc book-keeping, it will start/stop
* the collection of the CRC.
*
* This function also calls the interactive debug with the "crc" domain, so you
* can make use of this feature to actually see the screen that is being CRC'd.
*
* For continuous CRC collection look at igt_pipe_crc_start(),
* igt_pipe_crc_get_crcs() and igt_pipe_crc_stop().
*/
void igt_pipe_crc_collect_crc(igt_pipe_crc_t *pipe_crc, igt_crc_t *out_crc)
{
igt_debug_wait_for_keypress("crc");
igt_pipe_crc_start(pipe_crc);
read_one_crc(pipe_crc, out_crc);
igt_pipe_crc_stop(pipe_crc);
crc_sanity_checks(out_crc);
}
/**
* igt_pipe_crc_drain:
* @pipe_crc: pipe CRC object
*
* Discards all currently queued CRC values from @pipe_crc. This function does
* not block, and is useful to flush @pipe_crc. Afterwards you can get a fresh
* CRC with igt_pipe_crc_get_single().
*/
void igt_pipe_crc_drain(igt_pipe_crc_t *pipe_crc)
{
int ret;
igt_crc_t crc;
fcntl(pipe_crc->crc_fd, F_SETFL, pipe_crc->flags | O_NONBLOCK);
do {
ret = read_crc(pipe_crc, &crc);
} while (ret > 0 || ret == -EINVAL);
fcntl(pipe_crc->crc_fd, F_SETFL, pipe_crc->flags);
}
/**
* igt_pipe_crc_get_single:
* @pipe_crc: pipe CRC object
* @crc: buffer pointer for the captured CRC value
*
* Read a single @crc from @pipe_crc. This function does not block
* when nonblocking CRC is requested, and will return false if no CRC
* can be captured.
*
* If opened in blocking mode it will always block until a new CRC is read, like
* igt_pipe_crc_collect_crc().
*
* Callers must start and stop the capturing themselves by calling
* igt_pipe_crc_start() and igt_pipe_crc_stop(). For one-shot CRC collecting
* look at igt_pipe_crc_collect_crc().
*
* If capturing has been going on for a while and a fresh crc is required,
* you will need to call igt_pipe_crc_drain() first to remove stale entries.
*
* Returns:
* Whether a crc is captured, only false in non-blocking mode.
*/
bool
igt_pipe_crc_get_single(igt_pipe_crc_t *pipe_crc, igt_crc_t *crc)
{
bool found = true;
if (pipe_crc->flags & O_NONBLOCK) {
int ret = read_crc(pipe_crc, crc);
found = ret > 0;
} else
read_one_crc(pipe_crc, crc);
if (found)
crc_sanity_checks(crc);
return found;
}
/*
* Drop caches
*/
/**
* igt_drop_caches_has:
* @val: bitmask for DROP_* values
*
* This queries the debugfs to see if it supports the full set of desired
* operations.
*/
bool igt_drop_caches_has(int drm_fd, uint64_t val)
{
uint64_t mask;
int dir;
mask = 0;
dir = igt_debugfs_dir(drm_fd);
igt_sysfs_scanf(dir, "i915_gem_drop_caches", "0x%" PRIx64, &mask);
close(dir);
return (val & mask) == val;
}
/**
* igt_drop_caches_set:
* @val: bitmask for DROP_* values
*
* This calls the debugfs interface the drm/i915 GEM driver exposes to drop or
* evict certain classes of gem buffer objects.
*/
void igt_drop_caches_set(int drm_fd, uint64_t val)
{
int dir;
dir = igt_debugfs_dir(drm_fd);
igt_assert(igt_sysfs_printf(dir, "i915_gem_drop_caches",
"0x%" PRIx64, val) > 0);
close(dir);
}
/*
* Prefault control
*/
#define PREFAULT_DEBUGFS "/sys/module/i915/parameters/prefault_disable"
static void igt_prefault_control(bool enable)
{
const char *name = PREFAULT_DEBUGFS;
int fd;
char buf[2] = {'Y', 'N'};
int index;
fd = open(name, O_RDWR);
igt_require(fd >= 0);
if (enable)
index = 1;
else
index = 0;
igt_require(write(fd, &buf[index], 1) == 1);
close(fd);
}
static void enable_prefault_at_exit(int sig)
{
igt_enable_prefault();
}
/**
* igt_disable_prefault:
*
* Disable prefaulting in certain gem ioctls through the debugfs interface. As
* usual this installs an exit handler to clean up and re-enable prefaulting
* even when the test exited abnormally.
*
* igt_enable_prefault() will enable normale operation again.
*/
void igt_disable_prefault(void)
{
igt_prefault_control(false);
igt_install_exit_handler(enable_prefault_at_exit);
}
/**
* igt_enable_prefault:
*
* Enable prefault (again) through the debugfs interface.
*/
void igt_enable_prefault(void)
{
igt_prefault_control(true);
}
static int get_object_count(int fd)
{
int dir, ret, scanned;
igt_drop_caches_set(fd,
DROP_RETIRE | DROP_ACTIVE | DROP_IDLE | DROP_FREED);
dir = igt_debugfs_dir(fd);
scanned = igt_sysfs_scanf(dir, "i915_gem_objects",
"%i objects", &ret);
igt_assert_eq(scanned, 1);
close(dir);
return ret;
}
/**
* igt_get_stable_obj_count:
* @driver: fd to drm/i915 GEM driver
*
* This puts the driver into a stable (quiescent) state and then returns the
* current number of gem buffer objects as reported in the i915_gem_objects
* debugFS interface.
*/
int igt_get_stable_obj_count(int driver)
{
int obj_count;
gem_quiescent_gpu(driver);
obj_count = get_object_count(driver);
/* The test relies on the system being in the same state before and
* after the test so any difference in the object count is a result of
* leaks during the test. */
return obj_count;
}
void igt_debugfs_dump(int device, const char *filename)
{
char *contents;
int dir;
dir = igt_debugfs_dir(device);
contents = igt_sysfs_get(dir, filename);
close(dir);
igt_debug("%s:\n%s\n", filename, contents);
free(contents);
}
|