From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/lib/raid6/algos.c | 153 +++++++++++++++++++++++++++-----------------------
1 files changed, 82 insertions(+), 71 deletions(-)
diff --git a/kernel/lib/raid6/algos.c b/kernel/lib/raid6/algos.c
index 5065b1e..6d5e500 100644
--- a/kernel/lib/raid6/algos.c
+++ b/kernel/lib/raid6/algos.c
@@ -1,12 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/* -*- linux-c -*- ------------------------------------------------------- *
*
* Copyright 2002 H. Peter Anvin - All Rights Reserved
- *
- * 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, Inc., 53 Temple Place Ste 330,
- * Boston MA 02111-1307, USA; either version 2 of the License, or
- * (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
@@ -34,64 +29,60 @@
EXPORT_SYMBOL_GPL(raid6_call);
const struct raid6_calls * const raid6_algos[] = {
-#if defined(__ia64__)
- &raid6_intx16,
- &raid6_intx32,
-#endif
#if defined(__i386__) && !defined(__arch_um__)
- &raid6_mmxx1,
- &raid6_mmxx2,
- &raid6_sse1x1,
- &raid6_sse1x2,
- &raid6_sse2x1,
- &raid6_sse2x2,
-#ifdef CONFIG_AS_AVX2
- &raid6_avx2x1,
- &raid6_avx2x2,
-#endif
#ifdef CONFIG_AS_AVX512
- &raid6_avx512x1,
&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__)
- &raid6_sse2x1,
- &raid6_sse2x2,
- &raid6_sse2x4,
-#ifdef CONFIG_AS_AVX2
- &raid6_avx2x1,
- &raid6_avx2x2,
- &raid6_avx2x4,
-#endif
#ifdef CONFIG_AS_AVX512
- &raid6_avx512x1,
- &raid6_avx512x2,
&raid6_avx512x4,
+ &raid6_avx512x2,
+ &raid6_avx512x1,
#endif
+ &raid6_avx2x4,
+ &raid6_avx2x2,
+ &raid6_avx2x1,
+ &raid6_sse2x4,
+ &raid6_sse2x2,
+ &raid6_sse2x1,
#endif
#ifdef CONFIG_ALTIVEC
- &raid6_altivec1,
- &raid6_altivec2,
- &raid6_altivec4,
- &raid6_altivec8,
- &raid6_vpermxor1,
- &raid6_vpermxor2,
- &raid6_vpermxor4,
&raid6_vpermxor8,
+ &raid6_vpermxor4,
+ &raid6_vpermxor2,
+ &raid6_vpermxor1,
+ &raid6_altivec8,
+ &raid6_altivec4,
+ &raid6_altivec2,
+ &raid6_altivec1,
#endif
#if defined(CONFIG_S390)
&raid6_s390vx8,
#endif
- &raid6_intx1,
- &raid6_intx2,
- &raid6_intx4,
- &raid6_intx8,
#ifdef CONFIG_KERNEL_MODE_NEON
- &raid6_neonx1,
- &raid6_neonx2,
- &raid6_neonx4,
&raid6_neonx8,
+ &raid6_neonx4,
+ &raid6_neonx2,
+ &raid6_neonx1,
#endif
+#if defined(__ia64__)
+ &raid6_intx32,
+ &raid6_intx16,
+#endif
+ &raid6_intx8,
+ &raid6_intx4,
+ &raid6_intx2,
+ &raid6_intx1,
NULL
};
@@ -102,13 +93,11 @@
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
-#ifdef CONFIG_AS_AVX2
&raid6_recov_avx2,
-#endif
-#ifdef CONFIG_AS_SSSE3
&raid6_recov_ssse3,
#endif
#ifdef CONFIG_S390
@@ -128,6 +117,9 @@
#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)
{
@@ -151,7 +143,7 @@
}
static inline const struct raid6_calls *raid6_choose_gen(
- void *(*const dptrs)[(65536/PAGE_SIZE)+2], const int disks)
+ void *(*const dptrs)[RAID6_TEST_DISKS], const int disks)
{
unsigned long perf, bestgenperf, bestxorperf, j0, j1;
int start = (disks>>1)-1, stop = disks-3; /* work on the second half of the disks */
@@ -162,6 +154,11 @@
if (!best || (*algo)->prefer >= best->prefer) {
if ((*algo)->valid && !(*algo)->valid())
continue;
+
+ if (!IS_ENABLED(CONFIG_RAID6_PQ_BENCHMARK)) {
+ best = *algo;
+ break;
+ }
perf = 0;
@@ -181,7 +178,8 @@
best = *algo;
}
pr_info("raid6: %-8s gen() %5ld MB/s\n", (*algo)->name,
- (perf*HZ) >> (20-16+RAID6_TIME_JIFFIES_LG2));
+ (perf * HZ * (disks-2)) >>
+ (20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2));
if (!(*algo)->xor_syndrome)
continue;
@@ -204,17 +202,24 @@
bestxorperf = perf;
pr_info("raid6: %-8s xor() %5ld MB/s\n", (*algo)->name,
- (perf*HZ) >> (20-16+RAID6_TIME_JIFFIES_LG2+1));
+ (perf * HZ * (disks-2)) >>
+ (20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2 + 1));
}
}
if (best) {
- pr_info("raid6: using algorithm %s gen() %ld MB/s\n",
- best->name,
- (bestgenperf*HZ) >> (20-16+RAID6_TIME_JIFFIES_LG2));
- if (best->xor_syndrome)
- pr_info("raid6: .... xor() %ld MB/s, rmw enabled\n",
- (bestxorperf*HZ) >> (20-16+RAID6_TIME_JIFFIES_LG2+1));
+ if (IS_ENABLED(CONFIG_RAID6_PQ_BENCHMARK)) {
+ 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)
+ pr_info("raid6: .... xor() %ld MB/s, rmw enabled\n",
+ (bestxorperf * HZ * (disks-2)) >>
+ (20 - PAGE_SHIFT + RAID6_TIME_JIFFIES_LG2 + 1));
+ } else
+ pr_info("raid6: skip pq benchmark and using algorithm %s\n",
+ best->name);
raid6_call = *best;
} else
pr_err("raid6: Yikes! No algorithm found!\n");
@@ -228,27 +233,33 @@
int __init raid6_select_algo(void)
{
- const int disks = (65536/PAGE_SIZE)+2;
+ const int disks = RAID6_TEST_DISKS;
const struct raid6_calls *gen_best;
const struct raid6_recov_calls *rec_best;
- char *syndromes;
- void *dptrs[(65536/PAGE_SIZE)+2];
- int i;
+ char *disk_ptr, *p;
+ void *dptrs[RAID6_TEST_DISKS];
+ int i, cycle;
- for (i = 0; i < disks-2; i++)
- dptrs[i] = ((char *)raid6_gfmul) + PAGE_SIZE*i;
-
- /* Normal code - use a 2-page allocation to avoid D$ conflict */
- syndromes = (void *) __get_free_pages(GFP_KERNEL, 1);
-
- if (!syndromes) {
+ /* 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;
}
- dptrs[disks-2] = syndromes;
- dptrs[disks-1] = syndromes + PAGE_SIZE;
+ 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);
@@ -256,7 +267,7 @@
/* select raid recover functions */
rec_best = raid6_choose_recov();
- free_pages((unsigned long)syndromes, 1);
+ free_pages((unsigned long)disk_ptr, RAID6_TEST_DISKS_ORDER);
return gen_best && rec_best ? 0 : -EINVAL;
}
--
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