root/crypto/async_tx/raid6test.c

DEFINITIONS

1. callback
2. makedata
3. disk_type
4. raid6_dual_recov
5. test_disks
6. test
7. raid6_test
8. raid6_test_exit

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