diff options
Diffstat (limited to 'drivers/md/xor.c')
-rw-r--r-- | drivers/md/xor.c | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/drivers/md/xor.c b/drivers/md/xor.c deleted file mode 100644 index 324897c..0000000 --- a/drivers/md/xor.c +++ /dev/null @@ -1,154 +0,0 @@ -/* - * 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. - * - * 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, or (at your option) - * any later version. - * - * You should have received a copy of the GNU General Public License - * (for example /usr/src/linux/COPYING); if not, write to the Free - * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#define BH_TRACE 0 -#include <linux/module.h> -#include <linux/raid/md.h> -#include <linux/raid/xor.h> -#include <asm/xor.h> - -/* The xor routines to use. */ -static struct xor_block_template *active_template; - -void -xor_block(unsigned int count, unsigned int bytes, void **ptr) -{ - unsigned long *p0, *p1, *p2, *p3, *p4; - - p0 = (unsigned long *) ptr[0]; - p1 = (unsigned long *) ptr[1]; - if (count == 2) { - active_template->do_2(bytes, p0, p1); - return; - } - - p2 = (unsigned long *) ptr[2]; - if (count == 3) { - active_template->do_3(bytes, p0, p1, p2); - return; - } - - p3 = (unsigned long *) ptr[3]; - if (count == 4) { - active_template->do_4(bytes, p0, p1, p2, p3); - return; - } - - p4 = (unsigned long *) ptr[4]; - active_template->do_5(bytes, p0, p1, p2, p3, p4); -} - -/* Set of all registered templates. */ -static struct xor_block_template *template_list; - -#define BENCH_SIZE (PAGE_SIZE) - -static void -do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2) -{ - int speed; - unsigned long now; - int i, count, max; - - tmpl->next = template_list; - template_list = tmpl; - - /* - * 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++) { - now = jiffies; - count = 0; - while (jiffies == now) { - mb(); - tmpl->do_2(BENCH_SIZE, b1, b2); - mb(); - count++; - mb(); - } - if (count > max) - max = count; - } - - speed = max * (HZ * BENCH_SIZE / 1024); - tmpl->speed = speed; - - printk(" %-10s: %5d.%03d MB/sec\n", tmpl->name, - speed / 1000, speed % 1000); -} - -static int -calibrate_xor_block(void) -{ - void *b1, *b2; - struct xor_block_template *f, *fastest; - - b1 = (void *) __get_free_pages(GFP_KERNEL, 2); - if (! b1) { - printk("raid5: Yikes! No memory available.\n"); - return -ENOMEM; - } - b2 = b1 + 2*PAGE_SIZE + BENCH_SIZE; - - /* - * If this arch/cpu has a short-circuited selection, don't loop through all - * the possible functions, just test the best one - */ - - fastest = NULL; - -#ifdef XOR_SELECT_TEMPLATE - fastest = XOR_SELECT_TEMPLATE(fastest); -#endif - -#define xor_speed(templ) do_xor_speed((templ), b1, b2) - - if (fastest) { - printk(KERN_INFO "raid5: automatically using best checksumming function: %s\n", - fastest->name); - xor_speed(fastest); - } else { - printk(KERN_INFO "raid5: measuring checksumming speed\n"); - XOR_TRY_TEMPLATES; - fastest = template_list; - for (f = fastest; f; f = f->next) - if (f->speed > fastest->speed) - fastest = f; - } - - printk("raid5: using function: %s (%d.%03d MB/sec)\n", - fastest->name, fastest->speed / 1000, fastest->speed % 1000); - -#undef xor_speed - - free_pages((unsigned long)b1, 2); - - active_template = fastest; - return 0; -} - -static __exit void xor_exit(void) { } - -EXPORT_SYMBOL(xor_block); -MODULE_LICENSE("GPL"); - -module_init(calibrate_xor_block); -module_exit(xor_exit); |