[igt-dev] [PATCH i-g-t 3/4] tests/perf: new tests for OA interrupt

[Lionel Landwerlin]

On 16/01/2019 23:30, Chris Wilson wrote:
> Quoting Lionel Landwerlin (2019-01-16 15:37:31)
>> +       if (use_polling) {
>> +               while ((ret = poll(&pollfd, 1, -1)) < 0 &&
>> +                      errno == EINTR)
>> +                       ;
> Hmm, are we sending signals to ourself? Just wondering if EINTR here is
> a kernel bug...


Hmm nope. I just assumed anything could interrupt us.

I think igt_ioctl() does the same right?


>
>> +               igt_assert_eq(ret, 1);
>> +               igt_assert(pollfd.revents & POLLIN);
>> +       }
>> +
>> +       while ((ret = read(stream_fd, buf, MAX_OA_BUF_SIZE)) < 0 &&
>> +              errno == EINTR)
>> +               ;
>> +
>> +       if (ret < 0)
>> +               igt_debug("Unexpected error when reading after poll = %d\n", errno);
>> +       igt_assert_neq(ret, -1);
> igt_assert_f(ret != -1,
> 		"Unexpected error when reading after poll, %m\n");
> -Chris
>