^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* -*- linux-c -*- ------------------------------------------------------- *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright 2002 H. Peter Anvin - All Rights Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * ----------------------------------------------------------------------- */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * raid6/algos.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Algorithm list and algorithm selection for RAID-6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/raid/pq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #ifndef __KERNEL__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <sys/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #if !RAID6_USE_EMPTY_ZERO_PAGE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* In .bss so it's zeroed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) EXPORT_SYMBOL(raid6_empty_zero_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct raid6_calls raid6_call;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) EXPORT_SYMBOL_GPL(raid6_call);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) const struct raid6_calls * const raid6_algos[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #if defined(__i386__) && !defined(__arch_um__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #ifdef CONFIG_AS_AVX512
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) &raid6_avx512x2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) &raid6_avx512x1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) &raid6_avx2x2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) &raid6_avx2x1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) &raid6_sse2x2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) &raid6_sse2x1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) &raid6_sse1x2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) &raid6_sse1x1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) &raid6_mmxx2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) &raid6_mmxx1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #if defined(__x86_64__) && !defined(__arch_um__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #ifdef CONFIG_AS_AVX512
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) &raid6_avx512x4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) &raid6_avx512x2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) &raid6_avx512x1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) &raid6_avx2x4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) &raid6_avx2x2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) &raid6_avx2x1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) &raid6_sse2x4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) &raid6_sse2x2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) &raid6_sse2x1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #ifdef CONFIG_ALTIVEC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) &raid6_vpermxor8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) &raid6_vpermxor4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) &raid6_vpermxor2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) &raid6_vpermxor1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) &raid6_altivec8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) &raid6_altivec4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) &raid6_altivec2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) &raid6_altivec1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #if defined(CONFIG_S390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) &raid6_s390vx8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #ifdef CONFIG_KERNEL_MODE_NEON
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) &raid6_neonx8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) &raid6_neonx4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) &raid6_neonx2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) &raid6_neonx1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #if defined(__ia64__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) &raid6_intx32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) &raid6_intx16,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) &raid6_intx8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) &raid6_intx4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) &raid6_intx2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) &raid6_intx1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) void (*raid6_2data_recov)(int, size_t, int, int, void **);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) EXPORT_SYMBOL_GPL(raid6_2data_recov);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) void (*raid6_datap_recov)(int, size_t, int, void **);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) EXPORT_SYMBOL_GPL(raid6_datap_recov);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) const struct raid6_recov_calls *const raid6_recov_algos[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) #ifdef CONFIG_X86
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) #ifdef CONFIG_AS_AVX512
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) &raid6_recov_avx512,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) &raid6_recov_avx2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) &raid6_recov_ssse3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #ifdef CONFIG_S390
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) &raid6_recov_s390xc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) #if defined(CONFIG_KERNEL_MODE_NEON)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) &raid6_recov_neon,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) &raid6_recov_intx1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) #ifdef __KERNEL__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) #define RAID6_TIME_JIFFIES_LG2 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /* Need more time to be stable in userspace */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) #define RAID6_TIME_JIFFIES_LG2 9
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) #define time_before(x, y) ((x) < (y))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) #define RAID6_TEST_DISKS 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) #define RAID6_TEST_DISKS_ORDER 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static inline const struct raid6_recov_calls *raid6_choose_recov(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) const struct raid6_recov_calls *const *algo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) const struct raid6_recov_calls *best;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) for (best = NULL, algo = raid6_recov_algos; *algo; algo++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (!best || (*algo)->priority > best->priority)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (!(*algo)->valid || (*algo)->valid())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) best = *algo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (best) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) raid6_2data_recov = best->data2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) raid6_datap_recov = best->datap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) pr_info("raid6: using %s recovery algorithm\n", best->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) pr_err("raid6: Yikes! No recovery algorithm found!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return best;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static inline const struct raid6_calls *raid6_choose_gen(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) void *(*const dptrs)[RAID6_TEST_DISKS], const int disks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) unsigned long perf, bestgenperf, bestxorperf, j0, j1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) int start = (disks>>1)-1, stop = disks-3; /* work on the second half of the disks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) const struct raid6_calls *const *algo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) const struct raid6_calls *best;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) for (bestgenperf = 0, bestxorperf = 0, best = NULL, algo = raid6_algos; *algo; algo++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (!best || (*algo)->prefer >= best->prefer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if ((*algo)->valid && !(*algo)->valid())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (!IS_ENABLED(CONFIG_RAID6_PQ_BENCHMARK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) best = *algo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) perf = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) preempt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) j0 = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) while ((j1 = jiffies) == j0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) cpu_relax();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) while (time_before(jiffies,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) j1 + (1<<RAID6_TIME_JIFFIES_LG2))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) (*algo)->gen_syndrome(disks, PAGE_SIZE, *dptrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) perf++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (perf > bestgenperf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) bestgenperf = perf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) best = *algo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) pr_info("raid6: %-8s gen() %5ld MB/s\n", (*algo)->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) (perf * HZ * (disks-2)) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) (20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (!(*algo)->xor_syndrome)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) perf = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) preempt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) j0 = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) while ((j1 = jiffies) == j0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) cpu_relax();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) while (time_before(jiffies,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) j1 + (1<<RAID6_TIME_JIFFIES_LG2))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) (*algo)->xor_syndrome(disks, start, stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) PAGE_SIZE, *dptrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) perf++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (best == *algo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) bestxorperf = perf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) pr_info("raid6: %-8s xor() %5ld MB/s\n", (*algo)->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) (perf * HZ * (disks-2)) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) (20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2 + 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) if (best) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (IS_ENABLED(CONFIG_RAID6_PQ_BENCHMARK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) pr_info("raid6: using algorithm %s gen() %ld MB/s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) best->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) (bestgenperf * HZ * (disks-2)) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) (20 - PAGE_SHIFT+RAID6_TIME_JIFFIES_LG2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (best->xor_syndrome)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) pr_info("raid6: .... xor() %ld MB/s, rmw enabled\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) (bestxorperf * HZ * (disks-2)) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) (20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2 + 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) pr_info("raid6: skip pq benchmark and using algorithm %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) best->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) raid6_call = *best;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) pr_err("raid6: Yikes! No algorithm found!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) return best;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) /* Try to pick the best algorithm */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) /* This code uses the gfmul table as convenient data set to abuse */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) int __init raid6_select_algo(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) const int disks = RAID6_TEST_DISKS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) const struct raid6_calls *gen_best;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) const struct raid6_recov_calls *rec_best;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) char *disk_ptr, *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) void *dptrs[RAID6_TEST_DISKS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) int i, cycle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* prepare the buffer and fill it circularly with gfmul table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) disk_ptr = (char *)__get_free_pages(GFP_KERNEL, RAID6_TEST_DISKS_ORDER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) if (!disk_ptr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) pr_err("raid6: Yikes! No memory available.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) p = disk_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) for (i = 0; i < disks; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) dptrs[i] = p + PAGE_SIZE * i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) cycle = ((disks - 2) * PAGE_SIZE) / 65536;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) for (i = 0; i < cycle; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) memcpy(p, raid6_gfmul, 65536);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) p += 65536;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if ((disks - 2) * PAGE_SIZE % 65536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) memcpy(p, raid6_gfmul, (disks - 2) * PAGE_SIZE % 65536);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) /* select raid gen_syndrome function */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) gen_best = raid6_choose_gen(&dptrs, disks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /* select raid recover functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) rec_best = raid6_choose_recov();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) free_pages((unsigned long)disk_ptr, RAID6_TEST_DISKS_ORDER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) return gen_best && rec_best ? 0 : -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) static void raid6_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) do { } while (0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) subsys_initcall(raid6_select_algo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) module_exit(raid6_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) MODULE_DESCRIPTION("RAID6 Q-syndrome calculations");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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