On Wednesday, 17 April 2024 11:37:55 CEST Kamil Konieczny wrote:
> Hi Janusz,
> On 2024-04-15 at 19:31:59 +0200, Janusz Krzysztofik wrote:
> > KUnit can provide KTAP reports from test modules via debugfs files, one
> > per test suite. Using that source of test results instead of extracting
> > them from dmesg, where they may be interleaved with other kernel messages,
> > seems more easy to handle and less error prone. Switch to it.
> >
> > If KUnit debugfs support is found not configured then fall back to legacy
> > processing path.
> >
> > v3: Try to open KUnit debugfs directory before applying KUnit filters we
> > use for test case listing, otherwise those skip-all filters applied
> > can break legacy path we may enter on missing KUnit debugfs support
> > (detected by Kamil).
> > v2: Check validity of debugfs argument before calling kunit_get_tests()
> > (Kamil),
> > - replace multiple openat() + fdopen/fdopendir(), each followed by an
> > error check, with less expensive fopen/opendir() of file/dir pathname
> > components concatenated to a local buffer, protected from buffer
> > overflow or truncation with a single check for enough buffer space
> > (Lucas),
> > - avoid confusing 'if' statement condition (Lucas).
> >
> > Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik@xxxxxxxxxxxxxxx>
> > Cc: Kamil Konieczny <kamil.konieczny@xxxxxxxxxxxxxxx>
> > Reviewed-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
>
> Thank you for fixing legacy path, it works now.
> With this,
>
> Reviewed-by: Kamil Konieczny <kamil.konieczny@xxxxxxxxxxxxxxx>
Thank you Kamil, pushed.
Janusz
>
> > ---
> > @Lucas: I've assumed your R-b still applies, I hope you don't mind.
> >
> > lib/igt_kmod.c | 129 +++++++++++++++++++++++++++++++++++--------------
> > 1 file changed, 93 insertions(+), 36 deletions(-)
> >
> > diff --git a/lib/igt_kmod.c b/lib/igt_kmod.c
> > index 6659c27eba..33f059199f 100644
> > --- a/lib/igt_kmod.c
> > +++ b/lib/igt_kmod.c
> > @@ -28,6 +28,7 @@
> > #include <limits.h>
> > #include <pthread.h>
> > #include <signal.h>
> > +#include <stdio.h>
> > #include <stdlib.h>
> > #include <string.h>
> > #include <sys/stat.h>
> > @@ -39,6 +40,7 @@
> >
> > #include "igt_aux.h"
> > #include "igt_core.h"
> > +#include "igt_debugfs.h"
> > #include "igt_kmod.h"
> > #include "igt_ktap.h"
> > #include "igt_sysfs.h"
> > @@ -864,6 +866,19 @@ static int open_parameters(const char *module_name)
> > return open(path, O_RDONLY);
> > }
> >
> > +static void kunit_debugfs_path(char *kunit_path)
> > +{
> > + const char *debugfs_path = igt_debugfs_mount();
> > +
> > + if (igt_debug_on(!debugfs_path))
> > + return;
> > +
> > + if (igt_debug_on(strlen(debugfs_path) + strlen("/kunit/") >= PATH_MAX))
> > + return;
> > +
> > + strcpy(stpcpy(kunit_path, debugfs_path), "/kunit/");
> > +}
> > +
> > static bool kunit_set_filtering(const char *filter_glob, const char *filter,
> > const char *filter_action)
> > {
> > @@ -1071,21 +1086,41 @@ static void kunit_results_free(struct igt_list_head *results,
> > free(*suite_name);
> > }
> >
> > -static int kunit_get_results(struct igt_list_head *results, int kmsg_fd,
> > - struct igt_ktap_results **ktap)
> > +static int kunit_get_results(struct igt_list_head *results, const char *debugfs_path,
> > + const char *suite, struct igt_ktap_results **ktap)
> > {
> > + char results_path[PATH_MAX];
> > + FILE *results_stream;
> > + char *buf = NULL;
> > + size_t size = 0;
> > + ssize_t len;
> > int err;
> >
> > + if (igt_debug_on(strlen(debugfs_path) + strlen(suite) + strlen("/results") >= PATH_MAX))
> > + return -ENOSPC;
> > +
> > + strcpy(stpcpy(stpcpy(results_path, debugfs_path), suite), "/results");
> > + results_stream = fopen(results_path, "r");
> > + if (igt_debug_on(!results_stream))
> > + return -errno;
> > +
> > *ktap = igt_ktap_alloc(results);
> > - if (igt_debug_on(!*ktap))
> > - return -ENOMEM;
> > + if (igt_debug_on(!*ktap)) {
> > + err = -ENOMEM;
> > + goto out_fclose;
> > + }
> >
> > - do
> > - igt_debug_on((err = kunit_kmsg_result_get(results, NULL, kmsg_fd, *ktap),
> > - err && err != -EINPROGRESS));
> > - while (err == -EINPROGRESS);
> > + while (len = getline(&buf, &size, results_stream), len > 0) {
> > + err = igt_ktap_parse(buf, *ktap);
> > + if (err != -EINPROGRESS)
> > + break;
> > + }
> > +
> > + free(buf);
> >
> > igt_ktap_free(ktap);
> > +out_fclose:
> > + fclose(results_stream);
> >
> > return err;
> > }
> > @@ -1101,7 +1136,13 @@ static void __igt_kunit_legacy(struct igt_ktest *tst,
> > pthread_mutexattr_t attr;
> > IGT_LIST_HEAD(results);
> > unsigned long taints;
> > - int ret;
> > + int flags, ret;
> > +
> > + igt_skip_on_f(tst->kmsg < 0, "Could not open /dev/kmsg\n");
> > +
> > + igt_skip_on((flags = fcntl(tst->kmsg, F_GETFL, 0), flags < 0));
> > + igt_skip_on_f(fcntl(tst->kmsg, F_SETFL, flags & ~O_NONBLOCK) == -1,
> > + "Could not set /dev/kmsg to blocking mode\n");
> >
> > igt_skip_on(lseek(tst->kmsg, 0, SEEK_END) < 0);
> >
> > @@ -1224,30 +1265,21 @@ static void __igt_kunit_legacy(struct igt_ktest *tst,
> > igt_skip_on_f(ret, "KTAP parser failed\n");
> > }
> >
> > -static void kunit_get_tests_timeout(int signal)
> > -{
> > - igt_skip("Timed out while trying to extract a list of KUnit test cases from /dev/kmsg\n");
> > -}
> > -
> > static bool kunit_get_tests(struct igt_list_head *tests,
> > struct igt_ktest *tst,
> > const char *suite,
> > const char *opts,
> > + const char *debugfs_path,
> > + DIR **debugfs_dir,
> > struct igt_ktap_results **ktap)
> > {
> > - struct sigaction sigalrm = { .sa_handler = kunit_get_tests_timeout, },
> > - saved;
> > struct igt_ktap_result *r, *rn;
> > + struct dirent *subdir;
> > unsigned long taints;
> > - int flags, err;
> >
> > - igt_skip_on_f(tst->kmsg < 0, "Could not open /dev/kmsg\n");
> > -
> > - igt_skip_on((flags = fcntl(tst->kmsg, F_GETFL, 0), flags < 0));
> > - igt_skip_on_f(fcntl(tst->kmsg, F_SETFL, flags & ~O_NONBLOCK) == -1,
> > - "Could not set /dev/kmsg to blocking mode\n");
> > -
> > - igt_skip_on(lseek(tst->kmsg, 0, SEEK_END) < 0);
> > + *debugfs_dir = opendir(debugfs_path);
> > + if (igt_debug_on(!*debugfs_dir))
> > + return false;
> >
> > /*
> > * To get a list of test cases provided by a kunit test module, ask the
> > @@ -1260,19 +1292,37 @@ static bool kunit_get_tests(struct igt_list_head *tests,
> > if (igt_debug_on(!kunit_set_filtering(suite, "module=none", "skip")))
> > return false;
> >
> > + if (!suite) {
> > + seekdir(*debugfs_dir, 2); /* directory itself and its parent */
> > + errno = 0;
> > + igt_skip_on_f(readdir(*debugfs_dir) || errno,
> > + "Require empty KUnit debugfs directory\n");
> > + rewinddir(*debugfs_dir);
> > + }
> > +
> > igt_skip_on(modprobe(tst->kmod, opts));
> > igt_skip_on(igt_kernel_tainted(&taints));
> >
> > - igt_skip_on(sigaction(SIGALRM, &sigalrm, &saved));
> > - alarm(10);
> > + while (subdir = readdir(*debugfs_dir), subdir) {
> > + if (!(subdir->d_type & DT_DIR))
> > + continue;
> >
> > - err = kunit_get_results(tests, tst->kmsg, ktap);
> > + if (!strcmp(subdir->d_name, ".") || !strcmp(subdir->d_name, ".."))
> > + continue;
> >
> > - alarm(0);
> > - igt_debug_on(sigaction(SIGALRM, &saved, NULL));
> > + if (suite && strcmp(subdir->d_name, suite))
> > + continue;
> >
> > - igt_skip_on_f(err,
> > - "KTAP parser failed while getting a list of test cases\n");
> > + igt_warn_on_f(kunit_get_results(tests, debugfs_path, subdir->d_name, ktap),
> > + "parsing KTAP report from test suite \"%s\" failed\n",
> > + subdir->d_name);
> > +
> > + if (suite)
> > + break;
> > + }
> > +
> > + closedir(*debugfs_dir);
> > + *debugfs_dir = NULL;
> >
> > igt_list_for_each_entry_safe(r, rn, tests, link)
> > igt_require_f(r->code == IGT_EXIT_SKIP,
> > @@ -1287,6 +1337,7 @@ static void __igt_kunit(struct igt_ktest *tst,
> > const char *subtest,
> > const char *suite,
> > const char *opts,
> > + const char *debugfs_path,
> > struct igt_list_head *tests,
> > struct igt_ktap_results **ktap)
> > {
> > @@ -1307,8 +1358,6 @@ static void __igt_kunit(struct igt_ktest *tst,
> >
> > igt_skip_on(igt_kernel_tainted(&taints));
> >
> > - igt_fail_on(lseek(tst->kmsg, 0, SEEK_END) == -1 && errno);
> > -
> > igt_assert_lt(snprintf(glob, sizeof(glob), "%s.%s",
> > t->suite_name, t->case_name),
> > sizeof(glob));
> > @@ -1317,7 +1366,8 @@ static void __igt_kunit(struct igt_ktest *tst,
> > igt_assert_eq(modprobe(tst->kmod, opts), 0);
> > igt_assert_eq(igt_kernel_tainted(&taints), 0);
> >
> > - igt_assert_eq(kunit_get_results(&results, tst->kmsg, ktap), 0);
> > + igt_assert_eq(kunit_get_results(&results, debugfs_path,
> > + t->suite_name, ktap), 0);
> >
> > for (i = 0; i < 2; i++) {
> > kunit_result_free(&r, &suite_name, &case_name);
> > @@ -1385,9 +1435,11 @@ static void __igt_kunit(struct igt_ktest *tst,
> > */
> > void igt_kunit(const char *module_name, const char *suite, const char *opts)
> > {
> > + char debugfs_path[PATH_MAX] = { '\0', };
> > struct igt_ktest tst = { .kmsg = -1, };
> > struct igt_ktap_results *ktap = NULL;
> > const char *subtest = suite;
> > + DIR *debugfs_dir = NULL;
> > IGT_LIST_HEAD(tests);
> >
> > /*
> > @@ -1435,10 +1487,12 @@ void igt_kunit(const char *module_name, const char *suite, const char *opts)
> > * LTS kernels not capable of using KUnit filters for
> > * listing test cases in KTAP format, with igt_require.
> > */
> > - if (!kunit_get_tests(&tests, &tst, suite, opts, &ktap))
> > + kunit_debugfs_path(debugfs_path);
> > + if (igt_debug_on(!*debugfs_path) ||
> > + !kunit_get_tests(&tests, &tst, suite, opts, debugfs_path, &debugfs_dir, &ktap))
> > __igt_kunit_legacy(&tst, subtest, opts);
> > else
> > - __igt_kunit(&tst, subtest, suite, opts, &tests, &ktap);
> > + __igt_kunit(&tst, subtest, suite, opts, debugfs_path, &tests, &ktap);
> > }
> >
> > igt_fixture {
> > @@ -1448,6 +1502,9 @@ void igt_kunit(const char *module_name, const char *suite, const char *opts)
> >
> > kunit_results_free(&tests, &suite_name, &case_name);
> >
> > + if (debugfs_dir)
> > + closedir(debugfs_dir);
> > +
> > igt_ktest_end(&tst);
> > }
> >
>
