/*
 * asynchronous raid6 recovery self test
 * Copyright (c) 2009, Intel Corporation.
 *
 * based on drivers/md/raid6test/test.c:
 *      Copyright 2002-2007 H. Peter Anvin
 *
 * 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.
 *
 */
#include <linux/async_tx.h>
#include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/random.h>
#include <linux/module.h>

#undef pr
#define pr(fmt, args...) pr_info("raid6test: " fmt, ##args)

#define NDISKS 16 /* Including P and Q */

static struct page *dataptrs[NDISKS];
static addr_conv_t addr_conv[NDISKS];
static struct page *data[NDISKS+3];
static struct page *spare;
static struct page *recovi;
static struct page *recovj;

static void callback(void *param)
{
        struct completion *cmp = param;

        complete(cmp);
}

static void makedata(int disks)
{
        int i;

        for (i = 0; i < disks; i++) {
                prandom_bytes(page_address(data[i]), PAGE_SIZE);
                dataptrs[i] = data[i];
        }
}

static char disk_type(int d, int disks)
{
        if (d == disks - 2)
                return 'P';
        else if (d == disks - 1)
                return 'Q';
        else
                return 'D';
}

/* Recover two failed blocks. */
static void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, struct page **ptrs)
{
        struct async_submit_ctl submit;
        struct completion cmp;
        struct dma_async_tx_descriptor *tx = NULL;
        enum sum_check_flags result = ~0;

        if (faila > failb)
                swap(faila, failb);

        if (failb == disks-1) {
                if (faila == disks-2) {
                        /* P+Q failure.  Just rebuild the syndrome. */
                        init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
                        tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit);
                } else {
                        struct page *blocks[disks];
                        struct page *dest;
                        int count = 0;
                        int i;

                        /* data+Q failure.  Reconstruct data from P,
                         * then rebuild syndrome
                         */
                        for (i = disks; i-- ; ) {
                                if (i == faila || i == failb)
                                        continue;
                                blocks[count++] = ptrs[i];
                        }
                        dest = ptrs[faila];
                        init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL,
                                          NULL, NULL, addr_conv);
                        tx = async_xor(dest, blocks, 0, count, bytes, &submit);

                        init_async_submit(&submit, 0, tx, NULL, NULL, addr_conv);
                        tx = async_gen_syndrome(ptrs, 0, disks, bytes, &submit);
                }
        } else {
                if (failb == disks-2) {
                        /* data+P failure. */
                        init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
                        tx = async_raid6_datap_recov(disks, bytes, faila, ptrs, &submit);
                } else {
                        /* data+data failure. */
                        init_async_submit(&submit, 0, NULL, NULL, NULL, addr_conv);
                        tx = async_raid6_2data_recov(disks, bytes, faila, failb, ptrs, &submit);
                }
        }
        init_completion(&cmp);
        init_async_submit(&submit, ASYNC_TX_ACK, tx, callback, &cmp, addr_conv);
        tx = async_syndrome_val(ptrs, 0, disks, bytes, &result, spare, &submit);
        async_tx_issue_pending(tx);

        if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0)
                pr("%s: timeout! (faila: %d failb: %d disks: %d)\n",
                   __func__, faila, failb, disks);

        if (result != 0)
                pr("%s: validation failure! faila: %d failb: %d sum_check_flags: %x\n",
                   __func__, faila, failb, result);
}

static int test_disks(int i, int j, int disks)
{
        int erra, errb;

        memset(page_address(recovi), 0xf0, PAGE_SIZE);
        memset(page_address(recovj), 0xba, PAGE_SIZE);

        dataptrs[i] = recovi;
        dataptrs[j] = recovj;

        raid6_dual_recov(disks, PAGE_SIZE, i, j, dataptrs);

        erra = memcmp(page_address(data[i]), page_address(recovi), PAGE_SIZE);
        errb = memcmp(page_address(data[j]), page_address(recovj), PAGE_SIZE);

        pr("%s(%d, %d): faila=%3d(%c)  failb=%3d(%c)  %s\n",
           __func__, i, j, i, disk_type(i, disks), j, disk_type(j, disks),
           (!erra && !errb) ? "OK" : !erra ? "ERRB" : !errb ? "ERRA" : "ERRAB");

        dataptrs[i] = data[i];
        dataptrs[j] = data[j];

        return erra || errb;
}

static int test(int disks, int *tests)
{
        struct dma_async_tx_descriptor *tx;
        struct async_submit_ctl submit;
        struct completion cmp;
        int err = 0;
        int i, j;

        recovi = data[disks];
        recovj = data[disks+1];
        spare  = data[disks+2];

        makedata(disks);

        /* Nuke syndromes */
        memset(page_address(data[disks-2]), 0xee, PAGE_SIZE);
        memset(page_address(data[disks-1]), 0xee, PAGE_SIZE);

        /* Generate assumed good syndrome */
        init_completion(&cmp);
        init_async_submit(&submit, ASYNC_TX_ACK, NULL, callback, &cmp, addr_conv);
        tx = async_gen_syndrome(dataptrs, 0, disks, PAGE_SIZE, &submit);
        async_tx_issue_pending(tx);

        if (wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)) == 0) {
                pr("error: initial gen_syndrome(%d) timed out\n", disks);
                return 1;
        }

        pr("testing the %d-disk case...\n", disks);
        for (i = 0; i < disks-1; i++)
                for (j = i+1; j < disks; j++) {
                        (*tests)++;
                        err += test_disks(i, j, disks);
                }

        return err;
}


static int raid6_test(void)
{
        int err = 0;
        int tests = 0;
        int i;

        for (i = 0; i < NDISKS+3; i++) {
                data[i] = alloc_page(GFP_KERNEL);
                if (!data[i]) {
                        while (i--)
                                put_page(data[i]);
                        return -ENOMEM;
                }
        }

        /* the 4-disk and 5-disk cases are special for the recovery code */
        if (NDISKS > 4)
                err += test(4, &tests);
        if (NDISKS > 5)
                err += test(5, &tests);
        /* the 11 and 12 disk cases are special for ioatdma (p-disabled
         * q-continuation without extended descriptor)
         */
        if (NDISKS > 12) {
                err += test(11, &tests);
                err += test(12, &tests);
        }
        err += test(NDISKS, &tests);

        pr("\n");
        pr("complete (%d tests, %d failure%s)\n",
           tests, err, err == 1 ? "" : "s");

        for (i = 0; i < NDISKS+3; i++)
                put_page(data[i]);

        return 0;
}

static void raid6_test_exit(void)
{
}

/* when compiled-in wait for drivers to load first (assumes dma drivers
 * are also compliled-in)
 */
late_initcall(raid6_test);
module_exit(raid6_test_exit);
MODULE_AUTHOR("Dan Williams <dan.j.williams@intel.com>");
MODULE_DESCRIPTION("asynchronous RAID-6 recovery self tests");
MODULE_LICENSE("GPL");