linux/crypto/async_tx/raid6test.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * asynchronous raid6 recovery self test
   4 * Copyright (c) 2009, Intel Corporation.
   5 *
   6 * based on drivers/md/raid6test/test.c:
   7 *      Copyright 2002-2007 H. Peter Anvin
   8 */
   9#include <linux/async_tx.h>
  10#include <linux/gfp.h>
  11#include <linux/mm.h>
  12#include <linux/random.h>
  13#include <linux/module.h>
  14
  15#undef pr
  16#define pr(fmt, args...) pr_info("raid6test: " fmt, ##args)
  17
  18#define NDISKS 64 /* Including P and Q */
  19
  20static struct page *dataptrs[NDISKS];
  21unsigned int dataoffs[NDISKS];
  22static addr_conv_t addr_conv[NDISKS];
  23static struct page *data[NDISKS+3];
  24static struct page *spare;
  25static struct page *recovi;
  26static struct page *recovj;
  27
  28static void callback(void *param)
  29{
  30        struct completion *cmp = param;
  31
  32        complete(cmp);
  33}
  34
  35static void makedata(int disks)
  36{
  37        int i;
  38
  39        for (i = 0; i < disks; i++) {
  40                prandom_bytes(page_address(data[i]), PAGE_SIZE);
  41                dataptrs[i] = data[i];
  42                dataoffs[i] = 0;
  43        }
  44}
  45
  46static char disk_type(int d, int disks)
  47{
  48        if (d == disks - 2)
  49                return 'P';
  50        else if (d == disks - 1)
  51                return 'Q';
  52        else
  53                return 'D';
  54}
  55
  56/* Recover two failed blocks. */
  57static void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
  58                struct page **ptrs, unsigned int *offs)
  59{
  60        struct async_submit_ctl submit;
  61        struct completion cmp;
  62        struct dma_async_tx_descriptor *tx = NULL;
  63        enum sum_check_flags result = ~0;
  64
  65        if (faila > failb)
  66                swap(faila, failb);
  67
  68        if (failb == disks-1) {
  69                if (faila == disks-2) {
  70                        /* P+Q failure.  Just rebuild the syndrome. */
  71                        init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
  72                        tx = async_gen_syndrome(ptrs, offs,
  73                                        disks, bytes, &submit);
  74                } else {
  75                        struct page *blocks[NDISKS];
  76                        struct page *dest;
  77                        int count = 0;
  78                        int i;
  79
  80                        BUG_ON(disks > NDISKS);
  81
  82                        /* data+Q failure.  Reconstruct data from P,
  83                         * then rebuild syndrome
  84                         */
  85                        for (i = disks; i-- ; ) {
  86                                if (i == faila || i == failb)
  87                                        continue;
  88                                blocks[count++] = ptrs[i];
  89                        }
  90                        dest = ptrs[faila];
  91                        init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL,
  92                                          NULL, NULL, addr_conv);
  93                        tx = async_xor(dest, blocks, 0, count, bytes, &submit);
  94
  95                        init_async_submit(&submit, 0, tx, NULL, NULL, addr_conv);
  96                        tx = async_gen_syndrome(ptrs, offs,
  97                                        disks, bytes, &submit);
  98                }
  99        } else {
 100                if (failb == disks-2) {
 101                        /* data+P failure. */
 102                        init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
 103                        tx = async_raid6_datap_recov(disks, bytes,
 104                                        faila, ptrs, offs, &submit);
 105                } else {
 106                        /* data+data failure. */
 107                        init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
 108                        tx = async_raid6_2data_recov(disks, bytes,
 109                                        faila, failb, ptrs, offs, &submit);
 110                }
 111        }
 112        init_completion(&cmp);
 113        init_async_submit(&submit, ASYNC_TX_ACK, tx, callback, &cmp, addr_conv);
 114        tx = async_syndrome_val(ptrs, offs,
 115                        disks, bytes, &result, spare, 0, &submit);
 116        async_tx_issue_pending(tx);
 117
 118        if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0)
 119                pr("%s: timeout! (faila: %d failb: %d disks: %d)\n",
 120                   __func__, faila, failb, disks);
 121
 122        if (result != 0)
 123                pr("%s: validation failure! faila: %d failb: %d sum_check_flags: %x\n",
 124                   __func__, faila, failb, result);
 125}
 126
 127static int test_disks(int i, int j, int disks)
 128{
 129        int erra, errb;
 130
 131        memset(page_address(recovi), 0xf0, PAGE_SIZE);
 132        memset(page_address(recovj), 0xba, PAGE_SIZE);
 133
 134        dataptrs[i] = recovi;
 135        dataptrs[j] = recovj;
 136
 137        raid6_dual_recov(disks, PAGE_SIZE, i, j, dataptrs, dataoffs);
 138
 139        erra = memcmp(page_address(data[i]), page_address(recovi), PAGE_SIZE);
 140        errb = memcmp(page_address(data[j]), page_address(recovj), PAGE_SIZE);
 141
 142        pr("%s(%d, %d): faila=%3d(%c)  failb=%3d(%c)  %s\n",
 143           __func__, i, j, i, disk_type(i, disks), j, disk_type(j, disks),
 144           (!erra && !errb) ? "OK" : !erra ? "ERRB" : !errb ? "ERRA" : "ERRAB");
 145
 146        dataptrs[i] = data[i];
 147        dataptrs[j] = data[j];
 148
 149        return erra || errb;
 150}
 151
 152static int test(int disks, int *tests)
 153{
 154        struct dma_async_tx_descriptor *tx;
 155        struct async_submit_ctl submit;
 156        struct completion cmp;
 157        int err = 0;
 158        int i, j;
 159
 160        recovi = data[disks];
 161        recovj = data[disks+1];
 162        spare  = data[disks+2];
 163
 164        makedata(disks);
 165
 166        /* Nuke syndromes */
 167        memset(page_address(data[disks-2]), 0xee, PAGE_SIZE);
 168        memset(page_address(data[disks-1]), 0xee, PAGE_SIZE);
 169
 170        /* Generate assumed good syndrome */
 171        init_completion(&cmp);
 172        init_async_submit(&submit, ASYNC_TX_ACK, NULL, callback, &cmp, addr_conv);
 173        tx = async_gen_syndrome(dataptrs, dataoffs, disks, PAGE_SIZE, &submit);
 174        async_tx_issue_pending(tx);
 175
 176        if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0) {
 177                pr("error: initial gen_syndrome(%d) timed out\n", disks);
 178                return 1;
 179        }
 180
 181        pr("testing the %d-disk case...\n", disks);
 182        for (i = 0; i < disks-1; i++)
 183                for (j = i+1; j < disks; j++) {
 184                        (*tests)++;
 185                        err += test_disks(i, j, disks);
 186                }
 187
 188        return err;
 189}
 190
 191
 192static int raid6_test(void)
 193{
 194        int err = 0;
 195        int tests = 0;
 196        int i;
 197
 198        for (i = 0; i < NDISKS+3; i++) {
 199                data[i] = alloc_page(GFP_KERNEL);
 200                if (!data[i]) {
 201                        while (i--)
 202                                put_page(data[i]);
 203                        return -ENOMEM;
 204                }
 205        }
 206
 207        /* the 4-disk and 5-disk cases are special for the recovery code */
 208        if (NDISKS > 4)
 209                err += test(4, &tests);
 210        if (NDISKS > 5)
 211                err += test(5, &tests);
 212        /* the 11 and 12 disk cases are special for ioatdma (p-disabled
 213         * q-continuation without extended descriptor)
 214         */
 215        if (NDISKS > 12) {
 216                err += test(11, &tests);
 217                err += test(12, &tests);
 218        }
 219
 220        /* the 24 disk case is special for ioatdma as it is the boudary point
 221         * at which it needs to switch from 8-source ops to 16-source
 222         * ops for continuation (assumes DMA_HAS_PQ_CONTINUE is not set)
 223         */
 224        if (NDISKS > 24)
 225                err += test(24, &tests);
 226
 227        err += test(NDISKS, &tests);
 228
 229        pr("\n");
 230        pr("complete (%d tests, %d failure%s)\n",
 231           tests, err, err == 1 ? "" : "s");
 232
 233        for (i = 0; i < NDISKS+3; i++)
 234                put_page(data[i]);
 235
 236        return 0;
 237}
 238
 239static void raid6_test_exit(void)
 240{
 241}
 242
 243/* when compiled-in wait for drivers to load first (assumes dma drivers
 244 * are also compliled-in)
 245 */
 246late_initcall(raid6_test);
 247module_exit(raid6_test_exit);
 248MODULE_AUTHOR("Dan Williams <dan.j.williams@intel.com>");
 249MODULE_DESCRIPTION("asynchronous RAID-6 recovery self tests");
 250MODULE_LICENSE("GPL");
 251
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