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249 lines
6.3 KiB
249 lines
6.3 KiB
/*
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* asynchronous raid6 recovery self test
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* Copyright (c) 2009, Intel Corporation.
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*
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* based on drivers/md/raid6test/test.c:
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* Copyright 2002-2007 H. Peter Anvin
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <linux/async_tx.h>
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#include <linux/gfp.h>
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#include <linux/mm.h>
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#include <linux/random.h>
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#undef pr
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#define pr(fmt, args...) pr_info("raid6test: " fmt, ##args)
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#define NDISKS 16 /* Including P and Q */
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static struct page *dataptrs[NDISKS];
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static addr_conv_t addr_conv[NDISKS];
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static struct page *data[NDISKS+3];
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static struct page *spare;
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static struct page *recovi;
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static struct page *recovj;
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static void callback(void *param)
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{
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struct completion *cmp = param;
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complete(cmp);
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}
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static void makedata(int disks)
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{
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int i, j;
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for (i = 0; i < disks; i++) {
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for (j = 0; j < PAGE_SIZE/sizeof(u32); j += sizeof(u32)) {
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u32 *p = page_address(data[i]) + j;
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*p = random32();
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}
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dataptrs[i] = data[i];
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}
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}
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static char disk_type(int d, int disks)
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{
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if (d == disks - 2)
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return 'P';
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else if (d == disks - 1)
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return 'Q';
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else
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return 'D';
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}
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/* Recover two failed blocks. */
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static void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, struct page **ptrs)
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{
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struct async_submit_ctl submit;
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struct completion cmp;
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struct dma_async_tx_descriptor *tx = NULL;
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enum sum_check_flags result = ~0;
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if (faila > failb)
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swap(faila, failb);
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if (failb == disks-1) {
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if (faila == disks-2) {
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/* P+Q failure. Just rebuild the syndrome. */
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init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
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tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit);
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} else {
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struct page *blocks[disks];
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struct page *dest;
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int count = 0;
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int i;
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/* data+Q failure. Reconstruct data from P,
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* then rebuild syndrome
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*/
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for (i = disks; i-- ; ) {
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if (i == faila || i == failb)
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continue;
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blocks[count++] = ptrs[i];
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}
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dest = ptrs[faila];
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init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL,
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NULL, NULL, addr_conv);
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tx = async_xor(dest, blocks, 0, count, bytes, &submit);
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init_async_submit(&submit, 0, tx, NULL, NULL, addr_conv);
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tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit);
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}
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} else {
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if (failb == disks-2) {
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/* data+P failure. */
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init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
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tx = async_raid6_datap_recov(disks, bytes, faila, ptrs, &submit);
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} else {
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/* data+data failure. */
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init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
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tx = async_raid6_2data_recov(disks, bytes, faila, failb, ptrs, &submit);
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}
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}
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init_completion(&cmp);
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init_async_submit(&submit, ASYNC_TX_ACK, tx, callback, &cmp, addr_conv);
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tx = async_syndrome_val(ptrs, 0, disks, bytes, &result, spare, &submit);
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async_tx_issue_pending(tx);
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if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0)
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pr("%s: timeout! (faila: %d failb: %d disks: %d)\n",
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__func__, faila, failb, disks);
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if (result != 0)
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pr("%s: validation failure! faila: %d failb: %d sum_check_flags: %x\n",
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__func__, faila, failb, result);
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}
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static int test_disks(int i, int j, int disks)
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{
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int erra, errb;
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memset(page_address(recovi), 0xf0, PAGE_SIZE);
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memset(page_address(recovj), 0xba, PAGE_SIZE);
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dataptrs[i] = recovi;
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dataptrs[j] = recovj;
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raid6_dual_recov(disks, PAGE_SIZE, i, j, dataptrs);
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erra = memcmp(page_address(data[i]), page_address(recovi), PAGE_SIZE);
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errb = memcmp(page_address(data[j]), page_address(recovj), PAGE_SIZE);
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pr("%s(%d, %d): faila=%3d(%c) failb=%3d(%c) %s\n",
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__func__, i, j, i, disk_type(i, disks), j, disk_type(j, disks),
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(!erra && !errb) ? "OK" : !erra ? "ERRB" : !errb ? "ERRA" : "ERRAB");
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dataptrs[i] = data[i];
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dataptrs[j] = data[j];
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return erra || errb;
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}
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static int test(int disks, int *tests)
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{
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struct dma_async_tx_descriptor *tx;
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struct async_submit_ctl submit;
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struct completion cmp;
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int err = 0;
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int i, j;
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recovi = data[disks];
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recovj = data[disks+1];
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spare = data[disks+2];
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makedata(disks);
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/* Nuke syndromes */
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memset(page_address(data[disks-2]), 0xee, PAGE_SIZE);
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memset(page_address(data[disks-1]), 0xee, PAGE_SIZE);
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/* Generate assumed good syndrome */
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init_completion(&cmp);
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init_async_submit(&submit, ASYNC_TX_ACK, NULL, callback, &cmp, addr_conv);
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tx = async_gen_syndrome(dataptrs, 0, disks, PAGE_SIZE, &submit);
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async_tx_issue_pending(tx);
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if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0) {
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pr("error: initial gen_syndrome(%d) timed out\n", disks);
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return 1;
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}
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pr("testing the %d-disk case...\n", disks);
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for (i = 0; i < disks-1; i++)
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for (j = i+1; j < disks; j++) {
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(*tests)++;
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err += test_disks(i, j, disks);
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}
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return err;
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}
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static int raid6_test(void)
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{
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int err = 0;
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int tests = 0;
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int i;
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for (i = 0; i < NDISKS+3; i++) {
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data[i] = alloc_page(GFP_KERNEL);
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if (!data[i]) {
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while (i--)
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put_page(data[i]);
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return -ENOMEM;
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}
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}
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/* the 4-disk and 5-disk cases are special for the recovery code */
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if (NDISKS > 4)
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err += test(4, &tests);
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if (NDISKS > 5)
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err += test(5, &tests);
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/* the 11 and 12 disk cases are special for ioatdma (p-disabled
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* q-continuation without extended descriptor)
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*/
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if (NDISKS > 12) {
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err += test(11, &tests);
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err += test(12, &tests);
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}
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err += test(NDISKS, &tests);
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pr("\n");
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pr("complete (%d tests, %d failure%s)\n",
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tests, err, err == 1 ? "" : "s");
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for (i = 0; i < NDISKS+3; i++)
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put_page(data[i]);
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return 0;
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}
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static void raid6_test_exit(void)
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{
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}
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/* when compiled-in wait for drivers to load first (assumes dma drivers
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* are also compliled-in)
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*/
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late_initcall(raid6_test);
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module_exit(raid6_test_exit);
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MODULE_AUTHOR("Dan Williams <dan.j.williams@intel.com>");
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MODULE_DESCRIPTION("asynchronous RAID-6 recovery self tests");
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MODULE_LICENSE("GPL");
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