mirror of
https://github.com/torvalds/linux.git
synced 2024-11-21 19:46:16 +00:00
b089ea3cc3
Drop Itanium support from the RAID6 code, and along with it, the 16x and 32x unrolled versions, which were only used by IA64. Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
292 lines
6.3 KiB
C
292 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/* -*- linux-c -*- ------------------------------------------------------- *
|
|
*
|
|
* Copyright 2002 H. Peter Anvin - All Rights Reserved
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* raid6/algos.c
|
|
*
|
|
* Algorithm list and algorithm selection for RAID-6
|
|
*/
|
|
|
|
#include <linux/raid/pq.h>
|
|
#ifndef __KERNEL__
|
|
#include <sys/mman.h>
|
|
#include <stdio.h>
|
|
#else
|
|
#include <linux/module.h>
|
|
#include <linux/gfp.h>
|
|
/* In .bss so it's zeroed */
|
|
const char raid6_empty_zero_page[PAGE_SIZE] __attribute__((aligned(256)));
|
|
EXPORT_SYMBOL(raid6_empty_zero_page);
|
|
#endif
|
|
|
|
struct raid6_calls raid6_call;
|
|
EXPORT_SYMBOL_GPL(raid6_call);
|
|
|
|
const struct raid6_calls * const raid6_algos[] = {
|
|
#if defined(__i386__) && !defined(__arch_um__)
|
|
#ifdef CONFIG_AS_AVX512
|
|
&raid6_avx512x2,
|
|
&raid6_avx512x1,
|
|
#endif
|
|
&raid6_avx2x2,
|
|
&raid6_avx2x1,
|
|
&raid6_sse2x2,
|
|
&raid6_sse2x1,
|
|
&raid6_sse1x2,
|
|
&raid6_sse1x1,
|
|
&raid6_mmxx2,
|
|
&raid6_mmxx1,
|
|
#endif
|
|
#if defined(__x86_64__) && !defined(__arch_um__)
|
|
#ifdef CONFIG_AS_AVX512
|
|
&raid6_avx512x4,
|
|
&raid6_avx512x2,
|
|
&raid6_avx512x1,
|
|
#endif
|
|
&raid6_avx2x4,
|
|
&raid6_avx2x2,
|
|
&raid6_avx2x1,
|
|
&raid6_sse2x4,
|
|
&raid6_sse2x2,
|
|
&raid6_sse2x1,
|
|
#endif
|
|
#ifdef CONFIG_ALTIVEC
|
|
&raid6_vpermxor8,
|
|
&raid6_vpermxor4,
|
|
&raid6_vpermxor2,
|
|
&raid6_vpermxor1,
|
|
&raid6_altivec8,
|
|
&raid6_altivec4,
|
|
&raid6_altivec2,
|
|
&raid6_altivec1,
|
|
#endif
|
|
#if defined(CONFIG_S390)
|
|
&raid6_s390vx8,
|
|
#endif
|
|
#ifdef CONFIG_KERNEL_MODE_NEON
|
|
&raid6_neonx8,
|
|
&raid6_neonx4,
|
|
&raid6_neonx2,
|
|
&raid6_neonx1,
|
|
#endif
|
|
#ifdef CONFIG_LOONGARCH
|
|
#ifdef CONFIG_CPU_HAS_LASX
|
|
&raid6_lasx,
|
|
#endif
|
|
#ifdef CONFIG_CPU_HAS_LSX
|
|
&raid6_lsx,
|
|
#endif
|
|
#endif
|
|
&raid6_intx8,
|
|
&raid6_intx4,
|
|
&raid6_intx2,
|
|
&raid6_intx1,
|
|
NULL
|
|
};
|
|
|
|
void (*raid6_2data_recov)(int, size_t, int, int, void **);
|
|
EXPORT_SYMBOL_GPL(raid6_2data_recov);
|
|
|
|
void (*raid6_datap_recov)(int, size_t, int, void **);
|
|
EXPORT_SYMBOL_GPL(raid6_datap_recov);
|
|
|
|
const struct raid6_recov_calls *const raid6_recov_algos[] = {
|
|
#ifdef CONFIG_X86
|
|
#ifdef CONFIG_AS_AVX512
|
|
&raid6_recov_avx512,
|
|
#endif
|
|
&raid6_recov_avx2,
|
|
&raid6_recov_ssse3,
|
|
#endif
|
|
#ifdef CONFIG_S390
|
|
&raid6_recov_s390xc,
|
|
#endif
|
|
#if defined(CONFIG_KERNEL_MODE_NEON)
|
|
&raid6_recov_neon,
|
|
#endif
|
|
#ifdef CONFIG_LOONGARCH
|
|
#ifdef CONFIG_CPU_HAS_LASX
|
|
&raid6_recov_lasx,
|
|
#endif
|
|
#ifdef CONFIG_CPU_HAS_LSX
|
|
&raid6_recov_lsx,
|
|
#endif
|
|
#endif
|
|
&raid6_recov_intx1,
|
|
NULL
|
|
};
|
|
|
|
#ifdef __KERNEL__
|
|
#define RAID6_TIME_JIFFIES_LG2 4
|
|
#else
|
|
/* Need more time to be stable in userspace */
|
|
#define RAID6_TIME_JIFFIES_LG2 9
|
|
#define time_before(x, y) ((x) < (y))
|
|
#endif
|
|
|
|
#define RAID6_TEST_DISKS 8
|
|
#define RAID6_TEST_DISKS_ORDER 3
|
|
|
|
static inline const struct raid6_recov_calls *raid6_choose_recov(void)
|
|
{
|
|
const struct raid6_recov_calls *const *algo;
|
|
const struct raid6_recov_calls *best;
|
|
|
|
for (best = NULL, algo = raid6_recov_algos; *algo; algo++)
|
|
if (!best || (*algo)->priority > best->priority)
|
|
if (!(*algo)->valid || (*algo)->valid())
|
|
best = *algo;
|
|
|
|
if (best) {
|
|
raid6_2data_recov = best->data2;
|
|
raid6_datap_recov = best->datap;
|
|
|
|
pr_info("raid6: using %s recovery algorithm\n", best->name);
|
|
} else
|
|
pr_err("raid6: Yikes! No recovery algorithm found!\n");
|
|
|
|
return best;
|
|
}
|
|
|
|
static inline const struct raid6_calls *raid6_choose_gen(
|
|
void *(*const dptrs)[RAID6_TEST_DISKS], const int disks)
|
|
{
|
|
unsigned long perf, bestgenperf, j0, j1;
|
|
int start = (disks>>1)-1, stop = disks-3; /* work on the second half of the disks */
|
|
const struct raid6_calls *const *algo;
|
|
const struct raid6_calls *best;
|
|
|
|
for (bestgenperf = 0, best = NULL, algo = raid6_algos; *algo; algo++) {
|
|
if (!best || (*algo)->priority >= best->priority) {
|
|
if ((*algo)->valid && !(*algo)->valid())
|
|
continue;
|
|
|
|
if (!IS_ENABLED(CONFIG_RAID6_PQ_BENCHMARK)) {
|
|
best = *algo;
|
|
break;
|
|
}
|
|
|
|
perf = 0;
|
|
|
|
preempt_disable();
|
|
j0 = jiffies;
|
|
while ((j1 = jiffies) == j0)
|
|
cpu_relax();
|
|
while (time_before(jiffies,
|
|
j1 + (1<<RAID6_TIME_JIFFIES_LG2))) {
|
|
(*algo)->gen_syndrome(disks, PAGE_SIZE, *dptrs);
|
|
perf++;
|
|
}
|
|
preempt_enable();
|
|
|
|
if (perf > bestgenperf) {
|
|
bestgenperf = perf;
|
|
best = *algo;
|
|
}
|
|
pr_info("raid6: %-8s gen() %5ld MB/s\n", (*algo)->name,
|
|
(perf * HZ * (disks-2)) >>
|
|
(20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2));
|
|
}
|
|
}
|
|
|
|
if (!best) {
|
|
pr_err("raid6: Yikes! No algorithm found!\n");
|
|
goto out;
|
|
}
|
|
|
|
raid6_call = *best;
|
|
|
|
if (!IS_ENABLED(CONFIG_RAID6_PQ_BENCHMARK)) {
|
|
pr_info("raid6: skipped pq benchmark and selected %s\n",
|
|
best->name);
|
|
goto out;
|
|
}
|
|
|
|
pr_info("raid6: using algorithm %s gen() %ld MB/s\n",
|
|
best->name,
|
|
(bestgenperf * HZ * (disks - 2)) >>
|
|
(20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2));
|
|
|
|
if (best->xor_syndrome) {
|
|
perf = 0;
|
|
|
|
preempt_disable();
|
|
j0 = jiffies;
|
|
while ((j1 = jiffies) == j0)
|
|
cpu_relax();
|
|
while (time_before(jiffies,
|
|
j1 + (1 << RAID6_TIME_JIFFIES_LG2))) {
|
|
best->xor_syndrome(disks, start, stop,
|
|
PAGE_SIZE, *dptrs);
|
|
perf++;
|
|
}
|
|
preempt_enable();
|
|
|
|
pr_info("raid6: .... xor() %ld MB/s, rmw enabled\n",
|
|
(perf * HZ * (disks - 2)) >>
|
|
(20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2 + 1));
|
|
}
|
|
|
|
out:
|
|
return best;
|
|
}
|
|
|
|
|
|
/* Try to pick the best algorithm */
|
|
/* This code uses the gfmul table as convenient data set to abuse */
|
|
|
|
int __init raid6_select_algo(void)
|
|
{
|
|
const int disks = RAID6_TEST_DISKS;
|
|
|
|
const struct raid6_calls *gen_best;
|
|
const struct raid6_recov_calls *rec_best;
|
|
char *disk_ptr, *p;
|
|
void *dptrs[RAID6_TEST_DISKS];
|
|
int i, cycle;
|
|
|
|
/* prepare the buffer and fill it circularly with gfmul table */
|
|
disk_ptr = (char *)__get_free_pages(GFP_KERNEL, RAID6_TEST_DISKS_ORDER);
|
|
if (!disk_ptr) {
|
|
pr_err("raid6: Yikes! No memory available.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
p = disk_ptr;
|
|
for (i = 0; i < disks; i++)
|
|
dptrs[i] = p + PAGE_SIZE * i;
|
|
|
|
cycle = ((disks - 2) * PAGE_SIZE) / 65536;
|
|
for (i = 0; i < cycle; i++) {
|
|
memcpy(p, raid6_gfmul, 65536);
|
|
p += 65536;
|
|
}
|
|
|
|
if ((disks - 2) * PAGE_SIZE % 65536)
|
|
memcpy(p, raid6_gfmul, (disks - 2) * PAGE_SIZE % 65536);
|
|
|
|
/* select raid gen_syndrome function */
|
|
gen_best = raid6_choose_gen(&dptrs, disks);
|
|
|
|
/* select raid recover functions */
|
|
rec_best = raid6_choose_recov();
|
|
|
|
free_pages((unsigned long)disk_ptr, RAID6_TEST_DISKS_ORDER);
|
|
|
|
return gen_best && rec_best ? 0 : -EINVAL;
|
|
}
|
|
|
|
static void raid6_exit(void)
|
|
{
|
|
do { } while (0);
|
|
}
|
|
|
|
subsys_initcall(raid6_select_algo);
|
|
module_exit(raid6_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("RAID6 Q-syndrome calculations");
|