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References: <20220829000920.38185-1-isabbasso@riseup.net> <20220829000920.38185-4-isabbasso@riseup.net>
In-Reply-To: <20220829000920.38185-4-isabbasso@riseup.net>
From:   David Gow <davidgow@google.com>
Date:   Thu, 1 Sep 2022 14:37:06 +0800
Message-ID: <CABVgOS=HO9XAf8C5X7ZD6aTW37r06ify==7AW9a8cpKsgLVfFw@mail.gmail.com>
Subject: Re: [PATCH i-g-t v2 3/4] lib/igt_kmod: add compatibility for KUnit
To:     Isabella Basso <isabbasso@riseup.net>
Cc:     igt-dev@lists.freedesktop.org, magalilemes00@gmail.com,
        =?UTF-8?B?TWHDrXJhIENhbmFs?= <maira.canal@usp.br>,
        Tales Aparecida <tales.aparecida@gmail.com>,
        Rodrigo Siqueira <rodrigo.siqueira@amd.com>, mwen@igalia.com,
        andrealmeid@riseup.net, Trevor Woerner <twoerner@gmail.com>,
        leandro.ribeiro@collabora.com, n@nfraprado.net,
        KUnit Development <kunit-dev@googlegroups.com>,
        Daniel Latypov <dlatypov@google.com>,
        Brendan Higgins <brendanhiggins@google.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Shuah Khan <skhan@linuxfoundation.org>,
        linux-kselftest@vger.kernel.org, dri-devel@lists.freedesktop.org,
        daniel@fooishbar.org, linux-kernel@vger.kernel.org
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On Mon, Aug 29, 2022 at 8:10 AM Isabella Basso <isabbasso@riseup.net> wrote:
>
> This adds functions for both executing the tests as well as parsing (K)TAP
> kmsg output, as per the KTAP spec [1].
>
> [1] https://www.kernel.org/doc/html/latest/dev-tools/ktap.html
>
> Signed-off-by: Isabella Basso <isabbasso@riseup.net>
> ---

Thanks very much for sending these patches out again.

Alas, I don't have a particularly useful igt setup to test this
properly, but I've left a couple of notes from trying it on my laptop
here.


>  lib/igt_kmod.c | 290 +++++++++++++++++++++++++++++++++++++++++++++++++
>  lib/igt_kmod.h |   2 +
>  2 files changed, 292 insertions(+)
>
> diff --git a/lib/igt_kmod.c b/lib/igt_kmod.c
> index 97cac7f5..93cdfcc5 100644
> --- a/lib/igt_kmod.c
> +++ b/lib/igt_kmod.c
> @@ -25,6 +25,7 @@
>  #include <signal.h>
>  #include <errno.h>
>  #include <sys/utsname.h>
> +#include <limits.h>
>
>  #include "igt_aux.h"
>  #include "igt_core.h"
> @@ -32,6 +33,8 @@
>  #include "igt_sysfs.h"
>  #include "igt_taints.h"
>
> +#define BUF_LEN 4096
> +
>  /**
>   * SECTION:igt_kmod
>   * @short_description: Wrappers around libkmod for module loading/unloading
> @@ -713,6 +716,293 @@ void igt_kselftest_get_tests(struct kmod_module *kmod,
>         kmod_module_info_free_list(pre);
>  }
>
> +/**
> + * lookup_value:
> + * @haystack: the string to search in
> + * @needle: the string to search for
> + *
> + * Returns: the value of the needle in the haystack, or -1 if not found.
> + */
> +static long lookup_value(const char *haystack, const char *needle)
> +{
> +       const char *needle_rptr;
> +       char *needle_end;
> +       long num;
> +
> +       needle_rptr = strcasestr(haystack, needle);
> +
> +       if (needle_rptr == NULL)
> +               return -1;
> +
> +       /* skip search string and whitespaces after it */
> +       needle_rptr += strlen(needle);
> +
> +       num = strtol(needle_rptr, &needle_end, 10);
> +
> +       if (needle_rptr == needle_end)
> +               return -1;
> +
> +       if (num == LONG_MIN || num == LONG_MAX)
> +               return 0;
> +
> +       return num > 0 ? num : 0;
> +}
> +
> +static int find_next_tap_subtest(char *record, char *test_name,
> +                                bool is_subtest)
> +{
> +       const char *name_lookup_str,
> +             *lend, *version_rptr, *name_rptr;
> +       long test_count;
> +
> +       name_lookup_str = "test: ";
> +
> +       version_rptr = strcasestr(record, "TAP version ");
> +       name_rptr = strcasestr(record, name_lookup_str);
> +
> +       /*
> +        * total test count will almost always appear as 0..N at the beginning
> +        * of a run, so we use it as indication of a run
> +        */
> +       test_count = lookup_value(record, "..");
> +
> +       /* no count found, so this is probably not starting a (sub)test */
> +       if (test_count < 0) {
> +               if (name_rptr != NULL) {
> +                       if (test_name[0] == '\0')
> +                               strncpy(test_name,
> +                                       name_rptr + strlen(name_lookup_str),
> +                                       BUF_LEN);
> +                       else if (strcmp(test_name, name_rptr + strlen(name_lookup_str)) == 0)
> +                               return 0;
> +                       else
> +                               test_name[0] = '\0';
> +
> +               }
> +               return -1;
> +       }
> +
> +       /*
> +        * "(K)TAP version XX" should be the first line on all (sub)tests as per
> +        * https://www.kernel.org/doc/html/latest/dev-tools/ktap.html#version-lines
> +        * but actually isn't, as it currently depends on whoever writes the
> +        * test to print this info

FYI: we're really trying to fix cases of "missing version lines",
largely by making the kunit_test_suites() macro work in more
circumstances.

So while it may be worth still handling the case where this is
missing, I don't think there are any tests in the latest versions of
the kernel which should have this missing.

> +        */
> +       if (version_rptr == NULL)
> +               igt_info("Missing test version string\n");
> +
> +       if (name_rptr == NULL) {
> +               /* we have to keep track of the name string, as it might be
> +                * contained in a line read previously */
> +               if (test_name[0] == '\0') {
> +                       igt_info("Missing test name string\n");
> +
> +                       if (is_subtest)
> +                               igt_info("Running %ld subtests...\n", test_count);
> +                       else
> +                               igt_info("Running %ld tests...\n", test_count);
> +               } else {
> +                       lend = strchrnul(test_name, '\n');
> +
> +                       if (*lend == '\0') {
> +                               if (is_subtest)
> +                                       igt_info("Executing %ld subtests in: %s\n",
> +                                                test_count, test_name);
> +                               else
> +                                       igt_info("Executing %ld tests in: %s\n",
> +                                                test_count, test_name);
> +                               return test_count;
> +                       }
> +
> +                       if (is_subtest)
> +                               igt_info("Executing %ld subtests in: %.*s\n",
> +                                        test_count, (int)(lend - test_name),
> +                                        test_name);
> +                       else
> +                               igt_info("Executing %ld tests in: %.*s\n",
> +                                        test_count, (int)(lend - test_name),
> +                                        test_name);
> +                       test_name[0] = '\0';
> +               }
> +       } else {
> +               name_rptr += strlen(name_lookup_str);
> +               lend = strchrnul(name_rptr, '\n');
> +               /*
> +                * as the test count comes after the test name we need not check
> +                * for a long line again
> +                */
> +               if (is_subtest)
> +                       igt_info("Executing %ld subtests in: %.*s\n",
> +                                test_count, (int)(lend - name_rptr),
> +                                name_rptr);
> +               else
> +                       igt_info("Executing %ld tests in: %.*s\n",
> +                                test_count, (int)(lend - name_rptr),
> +                                name_rptr);
> +       }
> +
> +       return test_count;
> +}
> +
> +static void parse_kmsg_for_tap(const char *lstart, char *lend,
> +                              int *sublevel, bool *failed_tests)
> +{
> +       const char *nok_rptr, *comment_start, *value_parse_start;
> +
> +       nok_rptr = strstr(lstart, "not ok ");
> +       if (nok_rptr != NULL) {
> +               igt_warn("kmsg> %.*s\n",
> +                        (int)(lend - lstart), lstart);
> +               *failed_tests = true;
> +               return;
> +       }
> +
> +       comment_start = strchrnul(lstart, '#');
> +
> +       /* check if we're still in a subtest */
> +       if (*comment_start != '\0') {
> +               comment_start++;
> +               value_parse_start = comment_start;
> +
> +               if (lookup_value(value_parse_start, "fail: ") > 0) {
> +                       igt_warn("kmsg> %.*s\n",
> +                                (int)(lend - comment_start), comment_start);
> +                       *failed_tests = true;
> +                       (*sublevel)--;
> +                       return;
> +               }
> +       }
> +
> +       igt_info("kmsg> %.*s\n",
> +                (int)(lend - lstart), lstart);
> +}
> +
> +static void igt_kunit_subtests(int fd, char *record,
> +                              int *sublevel, bool *failed_tests)
> +{
> +       char test_name[BUF_LEN + 1], *lend;
> +
> +       lend = NULL;
> +       test_name[0] = '\0';
> +       test_name[BUF_LEN] = '\0';
> +
> +       while (*sublevel >= 0) {
> +               const char *lstart;
> +               ssize_t r;
> +
> +               if (lend != NULL && *lend != '\0')
> +                       lseek(fd, (int) (lend - record), SEEK_CUR);
> +
> +               r = read(fd, record, BUF_LEN);
> +
> +               if (r <= 0) {
> +                       switch (errno) {
> +                       case EINTR:
> +                               continue;
> +                       case EPIPE:
> +                               igt_warn("kmsg truncated: too many messages. \
> +                                        You may want to increase log_buf_len \
> +                                        in your boot options\n");
> +                               continue;
> +                       case !EAGAIN:
> +                               igt_warn("kmsg truncated: unknown error (%m)\n");
> +                               *sublevel = -1;
> +                       default:
> +                               break;
> +                       }
> +                       break;
> +               }
> +
> +               lend = strchrnul(record, '\n');
> +
> +               /* in case line > 4096 */
> +               if (*lend == '\0')
> +                       continue;
> +
> +               if (find_next_tap_subtest(record, test_name, *sublevel > 0) != -1)
> +                       (*sublevel)++;
> +
> +               if (*sublevel > 0) {
> +                       lstart = strchrnul(record, ';');
> +
> +                       if (*lstart == '\0') {
> +                               igt_warn("kmsg truncated: output malformed (%m)\n");
> +                               igt_fail(IGT_EXIT_FAILURE);
> +                       }
> +
> +                       lstart++;
> +                       while (isspace(*lstart))
> +                               lstart++;
> +
> +                       parse_kmsg_for_tap(lstart, lend, sublevel, failed_tests);
> +               }
> +       }
> +
> +       if (*failed_tests || *sublevel < 0)
> +               igt_fail(IGT_EXIT_FAILURE);
> +       else
> +               igt_success();
> +}
> +
> +/**
> + * igt_kunit:
> + * @module_name: the name of the module
> + * @opts: options to load the module
> + *
> + * Loads the kunit module, parses its dmesg output, then unloads it
> + */
> +void igt_kunit(const char *module_name, const char *opts)
> +{
> +       struct igt_ktest tst;
> +       char record[BUF_LEN + 1];
> +       bool failed_tests = false;
> +       int sublevel = 0;
> +
> +       record[BUF_LEN] = '\0';
> +
> +       /* get normalized module name */
> +       if (igt_ktest_init(&tst, module_name) != 0) {
> +               igt_warn("Unable to initialize ktest for %s\n", module_name);
> +               return;
> +       }
> +
> +       if (igt_ktest_begin(&tst) != 0) {
> +               igt_warn("Unable to begin ktest for %s\n", module_name);
> +
> +               igt_ktest_fini(&tst);
> +               return;
> +       }
> +
> +       if (tst.kmsg < 0) {
> +               igt_warn("Could not open /dev/kmsg");
> +               goto unload;
> +       }
> +
> +       if (lseek(tst.kmsg, 0, SEEK_END)) {
> +               igt_warn("Could not seek the end of /dev/kmsg");
> +               goto unload;
> +       }
> +
> +       /* The kunit module is required for running any kunit tests */
> +       if (igt_kmod_load("kunit", NULL) != 0) {
> +               igt_warn("Unable to load kunit module\n");
> +               goto unload;
> +       }

Do you want to _require_ KUnit be built as a module, rather than built-in here?

Equally, does this need to mark a failure (or at least "SKIPPED")
rather than success, in the case it fails.

> +
> +       if (igt_kmod_load(module_name, opts) != 0) {
> +               igt_warn("Unable to load %s module\n", module_name);
> +               goto unload;
> +       }

As above, should this record a failure, or skip?

> +
> +       igt_kunit_subtests(tst.kmsg, record, &sublevel, &failed_tests);
> +unload:
> +       igt_kmod_unload("kunit", 0);

Do you want to unconditionally unload the KUnit module here? It's safe
(maybe even safer) to leave it loaded between runs of KUnit tests.

Equally, how would you handle the case where KUnit is already loaded?

> +
> +       igt_ktest_end(&tst);
> +
> +       igt_ktest_fini(&tst);
> +}
> +
>  static int open_parameters(const char *module_name)
>  {
>         char path[256];
> diff --git a/lib/igt_kmod.h b/lib/igt_kmod.h
> index ceb10cd0..737143c1 100644
> --- a/lib/igt_kmod.h
> +++ b/lib/igt_kmod.h
> @@ -45,6 +45,8 @@ int __igt_i915_driver_unload(char **whom);
>  int igt_amdgpu_driver_load(const char *opts);
>  int igt_amdgpu_driver_unload(void);
>
> +void igt_kunit(const char *module_name, const char *opts);
> +
>  void igt_kselftests(const char *module_name,
>                     const char *module_options,
>                     const char *result_option,
> --
> 2.37.2
>

Regardless, thanks very much. Hopefully I'll get a chance to play with
igt a bit more and actually get the tests running. :-)

Cheers,
-- David

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