/* alarmtimer suspend test * John Stultz (john.stultz@linaro.org) * (C) Copyright Linaro 2013 * Licensed under the GPLv2 * * This test makes sure the alarmtimer & RTC wakeup code is * functioning. * * To build: * $ gcc alarmtimer-suspend.c -o alarmtimer-suspend -lrt * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include #include #ifdef KTEST #include "../kselftest.h" #else static inline int ksft_exit_pass(void) { exit(0); } static inline int ksft_exit_fail(void) { exit(1); } #endif #define CLOCK_REALTIME 0 #define CLOCK_MONOTONIC 1 #define CLOCK_PROCESS_CPUTIME_ID 2 #define CLOCK_THREAD_CPUTIME_ID 3 #define CLOCK_MONOTONIC_RAW 4 #define CLOCK_REALTIME_COARSE 5 #define CLOCK_MONOTONIC_COARSE 6 #define CLOCK_BOOTTIME 7 #define CLOCK_REALTIME_ALARM 8 #define CLOCK_BOOTTIME_ALARM 9 #define CLOCK_HWSPECIFIC 10 #define CLOCK_TAI 11 #define NR_CLOCKIDS 12 #define NSEC_PER_SEC 1000000000ULL #define UNREASONABLE_LAT (NSEC_PER_SEC * 5) /* hopefully we resume in 5 secs */ #define SUSPEND_SECS 15 int alarmcount; int alarm_clock_id; struct timespec start_time; char *clockstring(int clockid) { switch (clockid) { case CLOCK_REALTIME: return "CLOCK_REALTIME"; case CLOCK_MONOTONIC: return "CLOCK_MONOTONIC"; case CLOCK_PROCESS_CPUTIME_ID: return "CLOCK_PROCESS_CPUTIME_ID"; case CLOCK_THREAD_CPUTIME_ID: return "CLOCK_THREAD_CPUTIME_ID"; case CLOCK_MONOTONIC_RAW: return "CLOCK_MONOTONIC_RAW"; case CLOCK_REALTIME_COARSE: return "CLOCK_REALTIME_COARSE"; case CLOCK_MONOTONIC_COARSE: return "CLOCK_MONOTONIC_COARSE"; case CLOCK_BOOTTIME: return "CLOCK_BOOTTIME"; case CLOCK_REALTIME_ALARM: return "CLOCK_REALTIME_ALARM"; case CLOCK_BOOTTIME_ALARM: return "CLOCK_BOOTTIME_ALARM"; case CLOCK_TAI: return "CLOCK_TAI"; }; return "UNKNOWN_CLOCKID"; } long long timespec_sub(struct timespec a, struct timespec b) { long long ret = NSEC_PER_SEC * b.tv_sec + b.tv_nsec; ret -= NSEC_PER_SEC * a.tv_sec + a.tv_nsec; return ret; } int final_ret = 0; void sigalarm(int signo) { long long delta_ns; struct timespec ts; clock_gettime(alarm_clock_id, &ts); alarmcount++; delta_ns = timespec_sub(start_time, ts); delta_ns -= NSEC_PER_SEC * SUSPEND_SECS * alarmcount; printf("ALARM(%i): %ld:%ld latency: %lld ns ", alarmcount, ts.tv_sec, ts.tv_nsec, delta_ns); if (delta_ns > UNREASONABLE_LAT) { printf("[FAIL]\n"); final_ret = -1; } else printf("[OK]\n"); } int main(void) { timer_t tm1; struct itimerspec its1, its2; struct sigevent se; struct sigaction act; int signum = SIGRTMAX; /* Set up signal handler: */ sigfillset(&act.sa_mask); act.sa_flags = 0; act.sa_handler = sigalarm; sigaction(signum, &act, NULL); /* Set up timer: */ memset(&se, 0, sizeof(se)); se.sigev_notify = SIGEV_SIGNAL; se.sigev_signo = signum; se.sigev_value.sival_int = 0; for (alarm_clock_id = CLOCK_REALTIME_ALARM; alarm_clock_id <= CLOCK_BOOTTIME_ALARM; alarm_clock_id++) { alarmcount = 0; if (timer_create(alarm_clock_id, &se, &tm1) == -1) { printf("timer_create failed, %s unsupported?\n", clockstring(alarm_clock_id)); break; } clock_gettime(alarm_clock_id, &start_time); printf("Start time (%s): %ld:%ld\n", clockstring(alarm_clock_id), start_time.tv_sec, start_time.tv_nsec); printf("Setting alarm for every %i seconds\n", SUSPEND_SECS); its1.it_value = start_time; its1.it_value.tv_sec += SUSPEND_SECS; its1.it_interval.tv_sec = SUSPEND_SECS; its1.it_interval.tv_nsec = 0; timer_settime(tm1, TIMER_ABSTIME, &its1, &its2); while (alarmcount < 5) sleep(1); /* First 5 alarms, do nothing */ printf("Starting suspend loops\n"); while (alarmcount < 10) { int ret; sleep(3); ret = system("echo mem > /sys/power/state"); if (ret) break; } timer_delete(tm1); } if (final_ret) return ksft_exit_fail(); return ksft_exit_pass(); } /tr>
authorBorislav Petkov <bp@suse.de>2017-01-20 21:29:40 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-23 09:39:55 +0100
commitc26665ab5c49ad3e142e0f054ca3204f259ba09c (patch)
tree3bab11918e18e9d25ef7544dba05cdf39d1abec5 /tools/virtio
parent7a308bb3016f57e5be11a677d15b821536419d36 (diff)
x86/microcode/intel: Drop stashed AP patch pointer optimization
This was meant to save us the scanning of the microcode containter in the initrd since the first AP had already done that but it can also hurt us: Imagine a single hyperthreaded CPU (Intel(R) Atom(TM) CPU N270, for example) which updates the microcode on the BSP but since the microcode engine is shared between the two threads, the update on CPU1 doesn't happen because it has already happened on CPU0 and we don't find a newer microcode revision on CPU1. Which doesn't set the intel_ucode_patch pointer and at initrd jettisoning time we don't save the microcode patch for later application. Now, when we suspend to RAM, the loaded microcode gets cleared so we need to reload but there's no patch saved in the cache. Removing the optimization fixes this issue and all is fine and dandy. Fixes: 06b8534cb728 ("x86/microcode: Rework microcode loading") Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20170120202955.4091-2-bp@alien8.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'tools/virtio')