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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 111 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.567572064@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
243 lines
5.9 KiB
C
243 lines
5.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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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#include <linux/module.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 64 /* 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;
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for (i = 0; i < disks; i++) {
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prandom_bytes(page_address(data[i]), PAGE_SIZE);
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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[NDISKS];
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struct page *dest;
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int count = 0;
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int i;
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BUG_ON(disks > NDISKS);
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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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/* the 24 disk case is special for ioatdma as it is the boudary point
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* at which it needs to switch from 8-source ops to 16-source
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* ops for continuation (assumes DMA_HAS_PQ_CONTINUE is not set)
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*/
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if (NDISKS > 24)
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err += test(24, &tests);
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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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