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crypto/xor.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * xor.c : Multiple Devices driver for Linux * * Copyright (C) 1996, 1997, 1998, 1999, 2000, * Ingo Molnar, Matti Aarnio, Jakub Jelinek, Richard Henderson. * * Dispatch optimized RAID-5 checksumming functions. |
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*/ #define BH_TRACE 0 #include <linux/module.h> |
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#include <linux/gfp.h> |
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#include <linux/raid/xor.h> |
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#include <linux/jiffies.h> |
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#include <linux/preempt.h> |
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#include <asm/xor.h> |
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#ifndef XOR_SELECT_TEMPLATE #define XOR_SELECT_TEMPLATE(x) (x) #endif |
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/* The xor routines to use. */ static struct xor_block_template *active_template; void |
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xor_blocks(unsigned int src_count, unsigned int bytes, void *dest, void **srcs) |
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{ |
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unsigned long *p1, *p2, *p3, *p4; |
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p1 = (unsigned long *) srcs[0]; if (src_count == 1) { active_template->do_2(bytes, dest, p1); |
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return; } |
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p2 = (unsigned long *) srcs[1]; if (src_count == 2) { active_template->do_3(bytes, dest, p1, p2); |
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return; } |
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p3 = (unsigned long *) srcs[2]; if (src_count == 3) { active_template->do_4(bytes, dest, p1, p2, p3); |
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return; } |
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p4 = (unsigned long *) srcs[3]; active_template->do_5(bytes, dest, p1, p2, p3, p4); |
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} |
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EXPORT_SYMBOL(xor_blocks); |
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/* Set of all registered templates. */ |
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static struct xor_block_template *__initdata template_list; |
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#define BENCH_SIZE (PAGE_SIZE) |
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static void __init |
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do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2) { int speed; |
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unsigned long now, j; |
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int i, count, max; tmpl->next = template_list; template_list = tmpl; |
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preempt_disable(); |
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/* * Count the number of XORs done during a whole jiffy, and use * this to calculate the speed of checksumming. We use a 2-page * allocation to have guaranteed color L1-cache layout. */ max = 0; for (i = 0; i < 5; i++) { |
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j = jiffies; |
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count = 0; |
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while ((now = jiffies) == j) cpu_relax(); while (time_before(jiffies, now + 1)) { |
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mb(); /* prevent loop optimzation */ |
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tmpl->do_2(BENCH_SIZE, b1, b2); mb(); count++; mb(); } if (count > max) max = count; } |
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preempt_enable(); |
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speed = max * (HZ * BENCH_SIZE / 1024); tmpl->speed = speed; |
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printk(KERN_INFO " %-10s: %5d.%03d MB/sec ", tmpl->name, |
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speed / 1000, speed % 1000); } |
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static int __init calibrate_xor_blocks(void) |
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{ void *b1, *b2; struct xor_block_template *f, *fastest; |
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fastest = XOR_SELECT_TEMPLATE(NULL); |
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if (fastest) { printk(KERN_INFO "xor: automatically using best " "checksumming function %-10s ", fastest->name); goto out; } |
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b1 = (void *) __get_free_pages(GFP_KERNEL, 2); |
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if (!b1) { printk(KERN_WARNING "xor: Yikes! No memory available. "); |
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return -ENOMEM; } b2 = b1 + 2*PAGE_SIZE + BENCH_SIZE; /* |
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* If this arch/cpu has a short-circuited selection, don't loop through * all the possible functions, just test the best one |
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*/ |
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#define xor_speed(templ) do_xor_speed((templ), b1, b2) |
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printk(KERN_INFO "xor: measuring software checksum speed "); XOR_TRY_TEMPLATES; fastest = template_list; for (f = fastest; f; f = f->next) if (f->speed > fastest->speed) fastest = f; |
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printk(KERN_INFO "xor: using function: %s (%d.%03d MB/sec) ", |
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fastest->name, fastest->speed / 1000, fastest->speed % 1000); #undef xor_speed free_pages((unsigned long)b1, 2); |
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out: |
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active_template = fastest; return 0; } static __exit void xor_exit(void) { } |
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MODULE_LICENSE("GPL"); |
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/* when built-in xor.o must initialize before drivers/md/md.o */ core_initcall(calibrate_xor_blocks); |
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module_exit(xor_exit); |