crypto/async_tx/raid6test.c

   1 /*
   2  * asynchronous raid6 recovery self test
   3  * Copyright (c) 2009, Intel Corporation.
   4  *
   5  * based on drivers/md/raid6test/test.c:
   6  *      Copyright 2002-2007 H. Peter Anvin
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms and conditions of the GNU General Public License,
  10  * version 2, as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  */
  22 #include <linux/async_tx.h>
  23 #include <linux/gfp.h>
  24 #include <linux/mm.h>
  25 #include <linux/random.h>
  26 #include <linux/module.h>
  27
  28 #undef pr
  29 #define pr(fmt, args...) pr_info("raid6test: " fmt, ##args)
  30
  31 #define NDISKS 16 /* Including P and Q */
  32
  33 static struct page *dataptrs[NDISKS];
  34 static addr_conv_t addr_conv[NDISKS];
  35 static struct page *data[NDISKS+3];
  36 static struct page *spare;
  37 static struct page *recovi;
  38 static struct page *recovj;
  39
  40 static void callback(void *param)
  41 {
  42         struct completion *cmp = param;
  43
  44         complete(cmp);
  45 }
  46
  47 static void makedata(int disks)
  48 {
  49         int i;
  50
  51         for (i = 0; i < disks; i++) {
  52                 prandom_bytes(page_address(data[i]), PAGE_SIZE);
  53                 dataptrs[i] = data[i];
  54         }
  55 }
  56
  57 static char disk_type(int d, int disks)
  58 {
  59         if (d == disks - 2)
  60                 return 'P';
  61         else if (d == disks - 1)
  62                 return 'Q';
  63         else
  64                 return 'D';
  65 }
  66
  67 /* Recover two failed blocks. */
  68 static void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, struct page **ptrs)
  69 {
  70         struct async_submit_ctl submit;
  71         struct completion cmp;
  72         struct dma_async_tx_descriptor *tx = NULL;
  73         enum sum_check_flags result = ~0;
  74
  75         if (faila > failb)
  76                 swap(faila, failb);
  77
  78         if (failb == disks-1) {
  79                 if (faila == disks-2) {
  80                         /* P+Q failure.  Just rebuild the syndrome. */
  81                         init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
  82                         tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit);
  83                 } else {
  84                         struct page *blocks[disks];
  85                         struct page *dest;
  86                         int count = 0;
  87                         int i;
  88
  89                         /* data+Q failure.  Reconstruct data from P,
  90                          * then rebuild syndrome
  91                          */
  92                         for (i = disks; i-- ; ) {
  93                                 if (i == faila || i == failb)
  94                                         continue;
  95                                 blocks[count++] = ptrs[i];
  96                         }
  97                         dest = ptrs[faila];
  98                         init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL,
  99                                           NULL, NULL, addr_conv);
 100                         tx = async_xor(dest, blocks, 0, count, bytes, &submit);
 101
 102                         init_async_submit(&submit, 0, tx, NULL, NULL, addr_conv);
 103                         tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit);
 104                 }
 105         } else {
 106                 if (failb == disks-2) {
 107                         /* data+P failure. */
 108                         init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
 109                         tx = async_raid6_datap_recov(disks, bytes, faila, ptrs, &submit);
 110                 } else {
 111                         /* data+data failure. */
 112                         init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
 113                         tx = async_raid6_2data_recov(disks, bytes, faila, failb, ptrs, &submit);
 114                 }
 115         }
 116         init_completion(&cmp);
 117         init_async_submit(&submit, ASYNC_TX_ACK, tx, callback, &cmp, addr_conv);
 118         tx = async_syndrome_val(ptrs, 0, disks, bytes, &result, spare, &submit);
 119         async_tx_issue_pending(tx);
 120
 121         if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0)
 122                 pr("%s: timeout! (faila: %d failb: %d disks: %d)\n",
 123                    __func__, faila, failb, disks);
 124
 125         if (result != 0)
 126                 pr("%s: validation failure! faila: %d failb: %d sum_check_flags: %x\n",
 127                    __func__, faila, failb, result);
 128 }
 129
 130 static int test_disks(int i, int j, int disks)
 131 {
 132         int erra, errb;
 133
 134         memset(page_address(recovi), 0xf0, PAGE_SIZE);
 135         memset(page_address(recovj), 0xba, PAGE_SIZE);
 136
 137         dataptrs[i] = recovi;
 138         dataptrs[j] = recovj;
 139
 140         raid6_dual_recov(disks, PAGE_SIZE, i, j, dataptrs);
 141
 142         erra = memcmp(page_address(data[i]), page_address(recovi), PAGE_SIZE);
 143         errb = memcmp(page_address(data[j]), page_address(recovj), PAGE_SIZE);
 144
 145         pr("%s(%d, %d): faila=%3d(%c)  failb=%3d(%c)  %s\n",
 146            __func__, i, j, i, disk_type(i, disks), j, disk_type(j, disks),
 147            (!erra && !errb) ? "OK" : !erra ? "ERRB" : !errb ? "ERRA" : "ERRAB");
 148
 149         dataptrs[i] = data[i];
 150         dataptrs[j] = data[j];
 151
 152         return erra || errb;
 153 }
 154
 155 static int test(int disks, int *tests)
 156 {
 157         struct dma_async_tx_descriptor *tx;
 158         struct async_submit_ctl submit;
 159         struct completion cmp;
 160         int err = 0;
 161         int i, j;
 162
 163         recovi = data[disks];
 164         recovj = data[disks+1];
 165         spare  = data[disks+2];
 166
 167         makedata(disks);
 168
 169         /* Nuke syndromes */
 170         memset(page_address(data[disks-2]), 0xee, PAGE_SIZE);
 171         memset(page_address(data[disks-1]), 0xee, PAGE_SIZE);
 172
 173         /* Generate assumed good syndrome */
 174         init_completion(&cmp);
 175         init_async_submit(&submit, ASYNC_TX_ACK, NULL, callback, &cmp, addr_conv);
 176         tx = async_gen_syndrome(dataptrs, 0, disks, PAGE_SIZE, &submit);
 177         async_tx_issue_pending(tx);
 178
 179         if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0) {
 180                 pr("error: initial gen_syndrome(%d) timed out\n", disks);
 181                 return 1;
 182         }
 183
 184         pr("testing the %d-disk case...\n", disks);
 185         for (i = 0; i < disks-1; i++)
 186                 for (j = i+1; j < disks; j++) {
 187                         (*tests)++;
 188                         err += test_disks(i, j, disks);
 189                 }
 190
 191         return err;
 192 }
 193
 194
 195 static int raid6_test(void)
 196 {
 197         int err = 0;
 198         int tests = 0;
 199         int i;
 200
 201         for (i = 0; i < NDISKS+3; i++) {
 202                 data[i] = alloc_page(GFP_KERNEL);
 203                 if (!data[i]) {
 204                         while (i--)
 205                                 put_page(data[i]);
 206                         return -ENOMEM;
 207                 }
 208         }
 209
 210         /* the 4-disk and 5-disk cases are special for the recovery code */
 211         if (NDISKS > 4)
 212                 err += test(4, &tests);
 213         if (NDISKS > 5)
 214                 err += test(5, &tests);
 215         /* the 11 and 12 disk cases are special for ioatdma (p-disabled
 216          * q-continuation without extended descriptor)
 217          */
 218         if (NDISKS > 12) {
 219                 err += test(11, &tests);
 220                 err += test(12, &tests);
 221         }
 222         err += test(NDISKS, &tests);
 223
 224         pr("\n");
 225         pr("complete (%d tests, %d failure%s)\n",
 226            tests, err, err == 1 ? "" : "s");
 227
 228         for (i = 0; i < NDISKS+3; i++)
 229                 put_page(data[i]);
 230
 231         return 0;
 232 }
 233
 234 static void raid6_test_exit(void)
 235 {
 236 }
 237
 238 /* when compiled-in wait for drivers to load first (assumes dma drivers
 239  * are also compliled-in)
 240  */
 241 late_initcall(raid6_test);
 242 module_exit(raid6_test_exit);
 243 MODULE_AUTHOR("Dan Williams <dan.j.williams@intel.com>");
 244 MODULE_DESCRIPTION("asynchronous RAID-6 recovery self tests");
 245 MODULE_LICENSE("GPL");