/* cpufreq-bench CPUFreq microbenchmark * * Copyright (C) 2008 Christian Kornacker * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #include #include "config.h" #include "system.h" #include "benchmark.h" /* Print out progress if we log into a file */ #define show_progress(total_time, progress_time) \ if (config->output != stdout) { \ fprintf(stdout, "Progress: %02lu %%\r", \ (progress_time * 100) / total_time); \ fflush(stdout); \ } /** * compute how many rounds of calculation we should do * to get the given load time * * @param load aimed load time in µs * * @retval rounds of calculation **/ unsigned int calculate_timespace(long load, struct config *config) { int i; long long now, then; unsigned int estimated = GAUGECOUNT; unsigned int rounds = 0; unsigned int timed = 0; if (config->verbose) printf("calibrating load of %lius, please wait...\n", load); /* get the initial calculation time for a specific number of rounds */ now = get_time(); ROUNDS(estimated); then = get_time(); timed = (unsigned int)(then - now); /* approximation of the wanted load time by comparing with the * initial calculation time */ for (i = 0; i < 4; i++) { rounds = (unsigned int)(load * estimated / timed); dprintf("calibrating with %u rounds\n", rounds); now = get_time(); ROUNDS(rounds); then = get_time(); timed = (unsigned int)(then - now); estimated = rounds; } if (config->verbose) printf("calibration done\n"); return estimated; } /** * benchmark * generates a specific sleep an load time with the performance * governor and compares the used time for same calculations done * with the configured powersave governor * * @param config config values for the benchmark * **/ void start_benchmark(struct config *config) { unsigned int _round, cycle; long long now, then; long sleep_time = 0, load_time = 0; long performance_time = 0, powersave_time = 0; unsigned int calculations; unsigned long total_time = 0, progress_time = 0; sleep_time = config->sleep; load_time = config->load; /* For the progress bar */ for (_round = 1; _round <= config->rounds; _round++) total_time += _round * (config->sleep + config->load); total_time *= 2; /* powersave and performance cycles */ for (_round = 0; _round < config->rounds; _round++) { performance_time = 0LL; powersave_time = 0LL; show_progress(total_time, progress_time); /* set the cpufreq governor to "performance" which disables * P-State switching. */ if (set_cpufreq_governor("performance", config->cpu) != 0) return; /* calibrate the calculation time. the resulting calculation * _rounds should produce a load which matches the configured * load time */ calculations = calculate_timespace(load_time, config); if (config->verbose) printf("_round %i: doing %u cycles with %u calculations" " for %lius\n", _round + 1, config->cycles, calculations, load_time); fprintf(config->output, "%u %li %li ", _round, load_time, sleep_time); if (config->verbose) printf("average: %lius, rps:%li\n", load_time / calculations, 1000000 * calculations / load_time); /* do some sleep/load cycles with the performance governor */ for (cycle = 0; cycle < config->cycles; cycle++) { now = get_time(); usleep(sleep_time); ROUNDS(calculations); then = get_time(); performance_time += then - now - sleep_time; if (config->verbose) printf("performance cycle took %lius, " "sleep: %lius, " "load: %lius, rounds: %u\n", (long)(then - now), sleep_time, load_time, calculations); } fprintf(config->output, "%li ", performance_time / config->cycles); progress_time += sleep_time + load_time; show_progress(total_time, progress_time); /* set the powersave governor which activates P-State switching * again */ if (set_cpufreq_governor(config->governor, config->cpu) != 0) return; /* again, do some sleep/load cycles with the * powersave governor */ for (cycle = 0; cycle < config->cycles; cycle++) { now = get_time(); usleep(sleep_time); ROUNDS(calculations); then = get_time(); powersave_time += then - now - sleep_time; if (config->verbose) printf("powersave cycle took %lius, " "sleep: %lius, " "load: %lius, rounds: %u\n", (long)(then - now), sleep_time, load_time, calculations); } progress_time += sleep_time + load_time; /* compare the average sleep/load cycles */ fprintf(config->output, "%li ", powersave_time / config->cycles); fprintf(config->output, "%.3f\n", performance_time * 100.0 / powersave_time); fflush(config->output); if (config->verbose) printf("performance is at %.2f%%\n", performance_time * 100.0 / powersave_time); sleep_time += config->sleep_step; load_time += config->load_step; } } ext.git/tree/?h=nds-private-remove&id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>b9a2afb38a4c2ac8ad31f49ec0d71fe9e5b1994c /drivers/usb/chipidea parent030305d69fc6963c16003f50d7e8d74b02d0a143 (diff)
PCI/MSI: Don't apply affinity if there aren't enough vectors left
Bart reported a problem wіth an out of bounds access in the low-level IRQ affinity code, which we root caused to the qla2xxx driver assigning all its MSI-X vectors to the pre and post vectors, and not having any left for the actually spread IRQs. Fix this issue by not asking for affinity assignment when there are no vectors to assign left. Fixes: 402723ad5c62 ("PCI/MSI: Provide pci_alloc_irq_vectors_affinity()") Link: https://lkml.kernel.org/r/1485359225.3093.3.camel@sandisk.com Reported-by: Bart Van Assche <bart.vanassche@sandisk.com> Tested-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/usb/chipidea')