mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 10:32:35 +00:00
3ec39abdcc
Use prandom_bytes() to generate random bytes for test data. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Dan Williams <djbw@fb.com> Cc: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
246 lines
6.2 KiB
C
246 lines
6.2 KiB
C
/*
|
|
* asynchronous raid6 recovery self test
|
|
* Copyright (c) 2009, Intel Corporation.
|
|
*
|
|
* based on drivers/md/raid6test/test.c:
|
|
* Copyright 2002-2007 H. Peter Anvin
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
*/
|
|
#include <linux/async_tx.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/random.h>
|
|
#include <linux/module.h>
|
|
|
|
#undef pr
|
|
#define pr(fmt, args...) pr_info("raid6test: " fmt, ##args)
|
|
|
|
#define NDISKS 16 /* Including P and Q */
|
|
|
|
static struct page *dataptrs[NDISKS];
|
|
static addr_conv_t addr_conv[NDISKS];
|
|
static struct page *data[NDISKS+3];
|
|
static struct page *spare;
|
|
static struct page *recovi;
|
|
static struct page *recovj;
|
|
|
|
static void callback(void *param)
|
|
{
|
|
struct completion *cmp = param;
|
|
|
|
complete(cmp);
|
|
}
|
|
|
|
static void makedata(int disks)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < disks; i++) {
|
|
prandom_bytes(page_address(data[i]), PAGE_SIZE);
|
|
dataptrs[i] = data[i];
|
|
}
|
|
}
|
|
|
|
static char disk_type(int d, int disks)
|
|
{
|
|
if (d == disks - 2)
|
|
return 'P';
|
|
else if (d == disks - 1)
|
|
return 'Q';
|
|
else
|
|
return 'D';
|
|
}
|
|
|
|
/* Recover two failed blocks. */
|
|
static void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, struct page **ptrs)
|
|
{
|
|
struct async_submit_ctl submit;
|
|
struct completion cmp;
|
|
struct dma_async_tx_descriptor *tx = NULL;
|
|
enum sum_check_flags result = ~0;
|
|
|
|
if (faila > failb)
|
|
swap(faila, failb);
|
|
|
|
if (failb == disks-1) {
|
|
if (faila == disks-2) {
|
|
/* P+Q failure. Just rebuild the syndrome. */
|
|
init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
|
|
tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit);
|
|
} else {
|
|
struct page *blocks[disks];
|
|
struct page *dest;
|
|
int count = 0;
|
|
int i;
|
|
|
|
/* data+Q failure. Reconstruct data from P,
|
|
* then rebuild syndrome
|
|
*/
|
|
for (i = disks; i-- ; ) {
|
|
if (i == faila || i == failb)
|
|
continue;
|
|
blocks[count++] = ptrs[i];
|
|
}
|
|
dest = ptrs[faila];
|
|
init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL,
|
|
NULL, NULL, addr_conv);
|
|
tx = async_xor(dest, blocks, 0, count, bytes, &submit);
|
|
|
|
init_async_submit(&submit, 0, tx, NULL, NULL, addr_conv);
|
|
tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit);
|
|
}
|
|
} else {
|
|
if (failb == disks-2) {
|
|
/* data+P failure. */
|
|
init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
|
|
tx = async_raid6_datap_recov(disks, bytes, faila, ptrs, &submit);
|
|
} else {
|
|
/* data+data failure. */
|
|
init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
|
|
tx = async_raid6_2data_recov(disks, bytes, faila, failb, ptrs, &submit);
|
|
}
|
|
}
|
|
init_completion(&cmp);
|
|
init_async_submit(&submit, ASYNC_TX_ACK, tx, callback, &cmp, addr_conv);
|
|
tx = async_syndrome_val(ptrs, 0, disks, bytes, &result, spare, &submit);
|
|
async_tx_issue_pending(tx);
|
|
|
|
if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0)
|
|
pr("%s: timeout! (faila: %d failb: %d disks: %d)\n",
|
|
__func__, faila, failb, disks);
|
|
|
|
if (result != 0)
|
|
pr("%s: validation failure! faila: %d failb: %d sum_check_flags: %x\n",
|
|
__func__, faila, failb, result);
|
|
}
|
|
|
|
static int test_disks(int i, int j, int disks)
|
|
{
|
|
int erra, errb;
|
|
|
|
memset(page_address(recovi), 0xf0, PAGE_SIZE);
|
|
memset(page_address(recovj), 0xba, PAGE_SIZE);
|
|
|
|
dataptrs[i] = recovi;
|
|
dataptrs[j] = recovj;
|
|
|
|
raid6_dual_recov(disks, PAGE_SIZE, i, j, dataptrs);
|
|
|
|
erra = memcmp(page_address(data[i]), page_address(recovi), PAGE_SIZE);
|
|
errb = memcmp(page_address(data[j]), page_address(recovj), PAGE_SIZE);
|
|
|
|
pr("%s(%d, %d): faila=%3d(%c) failb=%3d(%c) %s\n",
|
|
__func__, i, j, i, disk_type(i, disks), j, disk_type(j, disks),
|
|
(!erra && !errb) ? "OK" : !erra ? "ERRB" : !errb ? "ERRA" : "ERRAB");
|
|
|
|
dataptrs[i] = data[i];
|
|
dataptrs[j] = data[j];
|
|
|
|
return erra || errb;
|
|
}
|
|
|
|
static int test(int disks, int *tests)
|
|
{
|
|
struct dma_async_tx_descriptor *tx;
|
|
struct async_submit_ctl submit;
|
|
struct completion cmp;
|
|
int err = 0;
|
|
int i, j;
|
|
|
|
recovi = data[disks];
|
|
recovj = data[disks+1];
|
|
spare = data[disks+2];
|
|
|
|
makedata(disks);
|
|
|
|
/* Nuke syndromes */
|
|
memset(page_address(data[disks-2]), 0xee, PAGE_SIZE);
|
|
memset(page_address(data[disks-1]), 0xee, PAGE_SIZE);
|
|
|
|
/* Generate assumed good syndrome */
|
|
init_completion(&cmp);
|
|
init_async_submit(&submit, ASYNC_TX_ACK, NULL, callback, &cmp, addr_conv);
|
|
tx = async_gen_syndrome(dataptrs, 0, disks, PAGE_SIZE, &submit);
|
|
async_tx_issue_pending(tx);
|
|
|
|
if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0) {
|
|
pr("error: initial gen_syndrome(%d) timed out\n", disks);
|
|
return 1;
|
|
}
|
|
|
|
pr("testing the %d-disk case...\n", disks);
|
|
for (i = 0; i < disks-1; i++)
|
|
for (j = i+1; j < disks; j++) {
|
|
(*tests)++;
|
|
err += test_disks(i, j, disks);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
|
|
static int raid6_test(void)
|
|
{
|
|
int err = 0;
|
|
int tests = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < NDISKS+3; i++) {
|
|
data[i] = alloc_page(GFP_KERNEL);
|
|
if (!data[i]) {
|
|
while (i--)
|
|
put_page(data[i]);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
/* the 4-disk and 5-disk cases are special for the recovery code */
|
|
if (NDISKS > 4)
|
|
err += test(4, &tests);
|
|
if (NDISKS > 5)
|
|
err += test(5, &tests);
|
|
/* the 11 and 12 disk cases are special for ioatdma (p-disabled
|
|
* q-continuation without extended descriptor)
|
|
*/
|
|
if (NDISKS > 12) {
|
|
err += test(11, &tests);
|
|
err += test(12, &tests);
|
|
}
|
|
err += test(NDISKS, &tests);
|
|
|
|
pr("\n");
|
|
pr("complete (%d tests, %d failure%s)\n",
|
|
tests, err, err == 1 ? "" : "s");
|
|
|
|
for (i = 0; i < NDISKS+3; i++)
|
|
put_page(data[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void raid6_test_exit(void)
|
|
{
|
|
}
|
|
|
|
/* when compiled-in wait for drivers to load first (assumes dma drivers
|
|
* are also compliled-in)
|
|
*/
|
|
late_initcall(raid6_test);
|
|
module_exit(raid6_test_exit);
|
|
MODULE_AUTHOR("Dan Williams <dan.j.williams@intel.com>");
|
|
MODULE_DESCRIPTION("asynchronous RAID-6 recovery self tests");
|
|
MODULE_LICENSE("GPL");
|