// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright 2007-2008 Pierre Ossman
 */

#include <linux/mmc/core.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/slab.h>

#include <linux/scatterlist.h>
#include <linux/swap.h>         /* For nr_free_buffer_pages() */
#include <linux/list.h>

#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/seq_file.h>
#include <linux/module.h>

#include "core.h"
#include "card.h"
#include "host.h"
#include "bus.h"
#include "mmc_ops.h"

#define RESULT_OK               0
#define RESULT_FAIL             1
#define RESULT_UNSUP_HOST       2
#define RESULT_UNSUP_CARD       3

#define BUFFER_ORDER            2
#define BUFFER_SIZE             (PAGE_SIZE << BUFFER_ORDER)

#define TEST_ALIGN_END          8

/*
 * Limit the test area size to the maximum MMC HC erase group size.  Note that
 * the maximum SD allocation unit size is just 4MiB.
 */
#define TEST_AREA_MAX_SIZE (128 * 1024 * 1024)

/**
 * struct mmc_test_pages - pages allocated by 'alloc_pages()'.
 * @page: first page in the allocation
 * @order: order of the number of pages allocated
 */
struct mmc_test_pages {
        struct page *page;
        unsigned int order;
};

/**
 * struct mmc_test_mem - allocated memory.
 * @arr: array of allocations
 * @cnt: number of allocations
 */
struct mmc_test_mem {
        struct mmc_test_pages *arr;
        unsigned int cnt;
};

/**
 * struct mmc_test_area - information for performance tests.
 * @max_sz: test area size (in bytes)
 * @dev_addr: address on card at which to do performance tests
 * @max_tfr: maximum transfer size allowed by driver (in bytes)
 * @max_segs: maximum segments allowed by driver in scatterlist @sg
 * @max_seg_sz: maximum segment size allowed by driver
 * @blocks: number of (512 byte) blocks currently mapped by @sg
 * @sg_len: length of currently mapped scatterlist @sg
 * @mem: allocated memory
 * @sg: scatterlist
 * @sg_areq: scatterlist for non-blocking request
 */
struct mmc_test_area {
        unsigned long max_sz;
        unsigned int dev_addr;
        unsigned int max_tfr;
        unsigned int max_segs;
        unsigned int max_seg_sz;
        unsigned int blocks;
        unsigned int sg_len;
        struct mmc_test_mem *mem;
        struct scatterlist *sg;
        struct scatterlist *sg_areq;
};

/**
 * struct mmc_test_transfer_result - transfer results for performance tests.
 * @link: double-linked list
 * @count: amount of group of sectors to check
 * @sectors: amount of sectors to check in one group
 * @ts: time values of transfer
 * @rate: calculated transfer rate
 * @iops: I/O operations per second (times 100)
 */
struct mmc_test_transfer_result {
        struct list_head link;
        unsigned int count;
        unsigned int sectors;
        struct timespec64 ts;
        unsigned int rate;
        unsigned int iops;
};

/**
 * struct mmc_test_general_result - results for tests.
 * @link: double-linked list
 * @card: card under test
 * @testcase: number of test case
 * @result: result of test run
 * @tr_lst: transfer measurements if any as mmc_test_transfer_result
 */
struct mmc_test_general_result {
        struct list_head link;
        struct mmc_card *card;
        int testcase;
        int result;
        struct list_head tr_lst;
};

/**
 * struct mmc_test_dbgfs_file - debugfs related file.
 * @link: double-linked list
 * @card: card under test
 * @file: file created under debugfs
 */
struct mmc_test_dbgfs_file {
        struct list_head link;
        struct mmc_card *card;
        struct dentry *file;
};

/**
 * struct mmc_test_card - test information.
 * @card: card under test
 * @scratch: transfer buffer
 * @buffer: transfer buffer
 * @highmem: buffer for highmem tests
 * @area: information for performance tests
 * @gr: pointer to results of current testcase
 */
struct mmc_test_card {
        struct mmc_card *card;

        u8              scratch[BUFFER_SIZE];
        u8              *buffer;
#ifdef CONFIG_HIGHMEM
        struct page     *highmem;
#endif
        struct mmc_test_area            area;
        struct mmc_test_general_result  *gr;
};

enum mmc_test_prep_media {
        MMC_TEST_PREP_NONE = 0,
        MMC_TEST_PREP_WRITE_FULL = 1 << 0,
        MMC_TEST_PREP_ERASE = 1 << 1,
};

struct mmc_test_multiple_rw {
        unsigned int *sg_len;
        unsigned int *bs;
        unsigned int len;
        unsigned int size;
        bool do_write;
        bool do_nonblock_req;
        enum mmc_test_prep_media prepare;
};

/*******************************************************************/
/*  General helper functions                                       */
/*******************************************************************/

/*
 * Configure correct block size in card
 */
static int mmc_test_set_blksize(struct mmc_test_card *test, unsigned size)
{
        return mmc_set_blocklen(test->card, size);
}

static bool mmc_test_card_cmd23(struct mmc_card *card)
{
        return mmc_card_mmc(card) ||
               (mmc_card_sd(card) && card->scr.cmds & SD_SCR_CMD23_SUPPORT);
}

static void mmc_test_prepare_sbc(struct mmc_test_card *test,
                                 struct mmc_request *mrq, unsigned int blocks)
{
        struct mmc_card *card = test->card;

        if (!mrq->sbc || !mmc_host_cmd23(card->host) ||
            !mmc_test_card_cmd23(card) || !mmc_op_multi(mrq->cmd->opcode) ||
            (card->quirks & MMC_QUIRK_BLK_NO_CMD23)) {
                mrq->sbc = NULL;
                return;
        }

        mrq->sbc->opcode = MMC_SET_BLOCK_COUNT;
        mrq->sbc->arg = blocks;
        mrq->sbc->flags = MMC_RSP_R1 | MMC_CMD_AC;
}

/*
 * Fill in the mmc_request structure given a set of transfer parameters.
 */
static void mmc_test_prepare_mrq(struct mmc_test_card *test,
        struct mmc_request *mrq, struct scatterlist *sg, unsigned sg_len,
        unsigned dev_addr, unsigned blocks, unsigned blksz, int write)
{
        if (WARN_ON(!mrq || !mrq->cmd || !mrq->data || !mrq->stop))
                return;

        if (blocks > 1) {
                mrq->cmd->opcode = write ?
                        MMC_WRITE_MULTIPLE_BLOCK : MMC_READ_MULTIPLE_BLOCK;
        } else {
                mrq->cmd->opcode = write ?
                        MMC_WRITE_BLOCK : MMC_READ_SINGLE_BLOCK;
        }

        mrq->cmd->arg = dev_addr;
        if (!mmc_card_blockaddr(test->card))
                mrq->cmd->arg <<= 9;

        mrq->cmd->flags = MMC_RSP_R1 | MMC_CMD_ADTC;

        if (blocks == 1)
                mrq->stop = NULL;
        else {
                mrq->stop->opcode = MMC_STOP_TRANSMISSION;
                mrq->stop->arg = 0;
                mrq->stop->flags = MMC_RSP_R1B | MMC_CMD_AC;
        }

        mrq->data->blksz = blksz;
        mrq->data->blocks = blocks;
        mrq->data->flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
        mrq->data->sg = sg;
        mrq->data->sg_len = sg_len;

        mmc_test_prepare_sbc(test, mrq, blocks);

        mmc_set_data_timeout(mrq->data, test->card);
}

static int mmc_test_busy(struct mmc_command *cmd)
{
        return !(cmd->resp[0] & R1_READY_FOR_DATA) ||
                (R1_CURRENT_STATE(cmd->resp[0]) == R1_STATE_PRG);
}

/*
 * Wait for the card to finish the busy state
 */
static int mmc_test_wait_busy(struct mmc_test_card *test)
{
        int ret, busy;
        struct mmc_command cmd = {};

        busy = 0;
        do {
                memset(&cmd, 0, sizeof(struct mmc_command));

                cmd.opcode = MMC_SEND_STATUS;
                cmd.arg = test->card->rca << 16;
                cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;

                ret = mmc_wait_for_cmd(test->card->host, &cmd, 0);
                if (ret)
                        break;

                if (!busy && mmc_test_busy(&cmd)) {
                        busy = 1;
                        if (test->card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
                                pr_info("%s: Warning: Host did not wait for busy state to end.\n",
                                        mmc_hostname(test->card->host));
                }
        } while (mmc_test_busy(&cmd));

        return ret;
}

/*
 * Transfer a single sector of kernel addressable data
 */
static int mmc_test_buffer_transfer(struct mmc_test_card *test,
        u8 *buffer, unsigned addr, unsigned blksz, int write)
{
        struct mmc_request mrq = {};
        struct mmc_command cmd = {};
        struct mmc_command stop = {};
        struct mmc_data data = {};

        struct scatterlist sg;

        mrq.cmd = &cmd;
        mrq.data = &data;
        mrq.stop = &stop;

        sg_init_one(&sg, buffer, blksz);

        mmc_test_prepare_mrq(test, &mrq, &sg, 1, addr, 1, blksz, write);

        mmc_wait_for_req(test->card->host, &mrq);

        if (cmd.error)
                return cmd.error;
        if (data.error)
                return data.error;

        return mmc_test_wait_busy(test);
}

static void mmc_test_free_mem(struct mmc_test_mem *mem)
{
        if (!mem)
                return;
        while (mem->cnt--)
                __free_pages(mem->arr[mem->cnt].page,
                             mem->arr[mem->cnt].order);
        kfree(mem->arr);
        kfree(mem);
}

/*
 * Allocate a lot of memory, preferably max_sz but at least min_sz.  In case
 * there isn't much memory do not exceed 1/16th total lowmem pages.  Also do
 * not exceed a maximum number of segments and try not to make segments much
 * bigger than maximum segment size.
 */
static struct mmc_test_mem *mmc_test_alloc_mem(unsigned long min_sz,
                                               unsigned long max_sz,
                                               unsigned int max_segs,
                                               unsigned int max_seg_sz)
{
        unsigned long max_page_cnt = DIV_ROUND_UP(max_sz, PAGE_SIZE);
        unsigned long min_page_cnt = DIV_ROUND_UP(min_sz, PAGE_SIZE);
        unsigned long max_seg_page_cnt = DIV_ROUND_UP(max_seg_sz, PAGE_SIZE);
        unsigned long page_cnt = 0;
        unsigned long limit = nr_free_buffer_pages() >> 4;
        struct mmc_test_mem *mem;

        if (max_page_cnt > limit)
                max_page_cnt = limit;
        if (min_page_cnt > max_page_cnt)
                min_page_cnt = max_page_cnt;

        if (max_seg_page_cnt > max_page_cnt)
                max_seg_page_cnt = max_page_cnt;

        if (max_segs > max_page_cnt)
                max_segs = max_page_cnt;

        mem = kzalloc(sizeof(*mem), GFP_KERNEL);
        if (!mem)
                return NULL;

        mem->arr = kcalloc(max_segs, sizeof(*mem->arr), GFP_KERNEL);
        if (!mem->arr)
                goto out_free;

        while (max_page_cnt) {
                struct page *page;
                unsigned int order;
                gfp_t flags = GFP_KERNEL | GFP_DMA | __GFP_NOWARN |
                                __GFP_NORETRY;

                order = get_order(max_seg_page_cnt << PAGE_SHIFT);
                while (1) {
                        page = alloc_pages(flags, order);
                        if (page || !order)
                                break;
                        order -= 1;
                }
                if (!page) {
                        if (page_cnt < min_page_cnt)
                                goto out_free;
                        break;
                }
                mem->arr[mem->cnt].page = page;
                mem->arr[mem->cnt].order = order;
                mem->cnt += 1;
                if (max_page_cnt <= (1UL << order))
                        break;
                max_page_cnt -= 1UL << order;
                page_cnt += 1UL << order;
                if (mem->cnt >= max_segs) {
                        if (page_cnt < min_page_cnt)
                                goto out_free;
                        break;
                }
        }

        return mem;

out_free:
        mmc_test_free_mem(mem);
        return NULL;
}

/*
 * Map memory into a scatterlist.  Optionally allow the same memory to be
 * mapped more than once.
 */
static int mmc_test_map_sg(struct mmc_test_mem *mem, unsigned long size,
                           struct scatterlist *sglist, int repeat,
                           unsigned int max_segs, unsigned int max_seg_sz,
                           unsigned int *sg_len, int min_sg_len)
{
        struct scatterlist *sg = NULL;
        unsigned int i;
        unsigned long sz = size;

        sg_init_table(sglist, max_segs);
        if (min_sg_len > max_segs)
                min_sg_len = max_segs;

        *sg_len = 0;
        do {
                for (i = 0; i < mem->cnt; i++) {
                        unsigned long len = PAGE_SIZE << mem->arr[i].order;

                        if (min_sg_len && (size / min_sg_len < len))
                                len = ALIGN(size / min_sg_len, 512);
                        if (len > sz)
                                len = sz;
                        if (len > max_seg_sz)
                                len = max_seg_sz;
                        if (sg)
                                sg = sg_next(sg);
                        else
                                sg = sglist;
                        if (!sg)
                                return -EINVAL;
                        sg_set_page(sg, mem->arr[i].page, len, 0);
                        sz -= len;
                        *sg_len += 1;
                        if (!sz)
                                break;
                }
        } while (sz && repeat);

        if (sz)
                return -EINVAL;

        if (sg)
                sg_mark_end(sg);

        return 0;
}

/*
 * Map memory into a scatterlist so that no pages are contiguous.  Allow the
 * same memory to be mapped more than once.
 */
static int mmc_test_map_sg_max_scatter(struct mmc_test_mem *mem,
                                       unsigned long sz,
                                       struct scatterlist *sglist,
                                       unsigned int max_segs,
                                       unsigned int max_seg_sz,
                                       unsigned int *sg_len)
{
        struct scatterlist *sg = NULL;
        unsigned int i = mem->cnt, cnt;
        unsigned long len;
        void *base, *addr, *last_addr = NULL;

        sg_init_table(sglist, max_segs);

        *sg_len = 0;
        while (sz) {
                base = page_address(mem->arr[--i].page);
                cnt = 1 << mem->arr[i].order;
                while (sz && cnt) {
                        addr = base + PAGE_SIZE * --cnt;
                        if (last_addr && last_addr + PAGE_SIZE == addr)
                                continue;
                        last_addr = addr;
                        len = PAGE_SIZE;
                        if (len > max_seg_sz)
                                len = max_seg_sz;
                        if (len > sz)
                                len = sz;
                        if (sg)
                                sg = sg_next(sg);
                        else
                                sg = sglist;
                        if (!sg)
                                return -EINVAL;
                        sg_set_page(sg, virt_to_page(addr), len, 0);
                        sz -= len;
                        *sg_len += 1;
                }
                if (i == 0)
                        i = mem->cnt;
        }

        if (sg)
                sg_mark_end(sg);

        return 0;
}

/*
 * Calculate transfer rate in bytes per second.
 */
static unsigned int mmc_test_rate(uint64_t bytes, struct timespec64 *ts)
{
        uint64_t ns;

        ns = timespec64_to_ns(ts);
        bytes *= 1000000000;

        while (ns > UINT_MAX) {
                bytes >>= 1;
                ns >>= 1;
        }

        if (!ns)
                return 0;

        do_div(bytes, (uint32_t)ns);

        return bytes;
}

/*
 * Save transfer results for future usage
 */
static void mmc_test_save_transfer_result(struct mmc_test_card *test,
        unsigned int count, unsigned int sectors, struct timespec64 ts,
        unsigned int rate, unsigned int iops)
{
        struct mmc_test_transfer_result *tr;

        if (!test->gr)
                return;

        tr = kmalloc(sizeof(*tr), GFP_KERNEL);
        if (!tr)
                return;

        tr->count = count;
        tr->sectors = sectors;
        tr->ts = ts;
        tr->rate = rate;
        tr->iops = iops;

        list_add_tail(&tr->link, &test->gr->tr_lst);
}

/*
 * Print the transfer rate.
 */
static void mmc_test_print_rate(struct mmc_test_card *test, uint64_t bytes,
                                struct timespec64 *ts1, struct timespec64 *ts2)
{
        unsigned int rate, iops, sectors = bytes >> 9;
        struct timespec64 ts;

        ts = timespec64_sub(*ts2, *ts1);

        rate = mmc_test_rate(bytes, &ts);
        iops = mmc_test_rate(100, &ts); /* I/O ops per sec x 100 */

        pr_info("%s: Transfer of %u sectors (%u%s KiB) took %llu.%09u "
                         "seconds (%u kB/s, %u KiB/s, %u.%02u IOPS)\n",
                         mmc_hostname(test->card->host), sectors, sectors >> 1,
                         (sectors & 1 ? ".5" : ""), (u64)ts.tv_sec,
                         (u32)ts.tv_nsec, rate / 1000, rate / 1024,
                         iops / 100, iops % 100);

        mmc_test_save_transfer_result(test, 1, sectors, ts, rate, iops);
}

/*
 * Print the average transfer rate.
 */
static void mmc_test_print_avg_rate(struct mmc_test_card *test, uint64_t bytes,
                                    unsigned int count, struct timespec64 *ts1,
                                    struct timespec64 *ts2)
{
        unsigned int rate, iops, sectors = bytes >> 9;
        uint64_t tot = bytes * count;
        struct timespec64 ts;

        ts = timespec64_sub(*ts2, *ts1);

        rate = mmc_test_rate(tot, &ts);
        iops = mmc_test_rate(count * 100, &ts); /* I/O ops per sec x 100 */

        pr_info("%s: Transfer of %u x %u sectors (%u x %u%s KiB) took "
                         "%llu.%09u seconds (%u kB/s, %u KiB/s, "
                         "%u.%02u IOPS, sg_len %d)\n",
                         mmc_hostname(test->card->host), count, sectors, count,
                         sectors >> 1, (sectors & 1 ? ".5" : ""),
                         (u64)ts.tv_sec, (u32)ts.tv_nsec,
                         rate / 1000, rate / 1024, iops / 100, iops % 100,
                         test->area.sg_len);

        mmc_test_save_transfer_result(test, count, sectors, ts, rate, iops);
}

/*
 * Return the card size in sectors.
 */
static unsigned int mmc_test_capacity(struct mmc_card *card)
{
        if (!mmc_card_sd(card) && mmc_card_blockaddr(card))
                return card->ext_csd.sectors;
        else
                return card->csd.capacity << (card->csd.read_blkbits - 9);
}

/*******************************************************************/
/*  Test preparation and cleanup                                   */
/*******************************************************************/

/*
 * Fill the first couple of sectors of the card with known data
 * so that bad reads/writes can be detected
 */
static int __mmc_test_prepare(struct mmc_test_card *test, int write)
{
        int ret, i;

        ret = mmc_test_set_blksize(test, 512);
        if (ret)
                return ret;

        if (write)
                memset(test->buffer, 0xDF, 512);
        else {
                for (i = 0; i < 512; i++)
                        test->buffer[i] = i;
        }

        for (i = 0; i < BUFFER_SIZE / 512; i++) {
                ret = mmc_test_buffer_transfer(test, test->buffer, i, 512, 1);
                if (ret)
                        return ret;
        }

        return 0;
}

static int mmc_test_prepare_write(struct mmc_test_card *test)
{
        return __mmc_test_prepare(test, 1);
}

static int mmc_test_prepare_read(struct mmc_test_card *test)
{
        return __mmc_test_prepare(test, 0);
}

static int mmc_test_cleanup(struct mmc_test_card *test)
{
        int ret, i;

        ret = mmc_test_set_blksize(test, 512);
        if (ret)
                return ret;

        memset(test->buffer, 0, 512);

        for (i = 0; i < BUFFER_SIZE / 512; i++) {
                ret = mmc_test_buffer_transfer(test, test->buffer, i, 512, 1);
                if (ret)
                        return ret;
        }

        return 0;
}

/*******************************************************************/
/*  Test execution helpers                                         */
/*******************************************************************/

/*
 * Modifies the mmc_request to perform the "short transfer" tests
 */
static void mmc_test_prepare_broken_mrq(struct mmc_test_card *test,
        struct mmc_request *mrq, int write)
{
        if (WARN_ON(!mrq || !mrq->cmd || !mrq->data))
                return;

        if (mrq->data->blocks > 1) {
                mrq->cmd->opcode = write ?
                        MMC_WRITE_BLOCK : MMC_READ_SINGLE_BLOCK;
                mrq->stop = NULL;
        } else {
                mrq->cmd->opcode = MMC_SEND_STATUS;
                mrq->cmd->arg = test->card->rca << 16;
        }
}

/*
 * Checks that a normal transfer didn't have any errors
 */
static int mmc_test_check_result(struct mmc_test_card *test,
                                 struct mmc_request *mrq)
{
        int ret;

        if (WARN_ON(!mrq || !mrq->cmd || !mrq->data))
                return -EINVAL;

        ret = 0;

        if (mrq->sbc && mrq->sbc->error)
                ret = mrq->sbc->error;
        if (!ret && mrq->cmd->error)
                ret = mrq->cmd->error;
        if (!ret && mrq->data->error)
                ret = mrq->data->error;
        if (!ret && mrq->stop && mrq->stop->error)
                ret = mrq->stop->error;
        if (!ret && mrq->data->bytes_xfered !=
                mrq->data->blocks * mrq->data->blksz)
                ret = RESULT_FAIL;

        if (ret == -EINVAL)
                ret = RESULT_UNSUP_HOST;

        return ret;
}

/*
 * Checks that a "short transfer" behaved as expected
 */
static int mmc_test_check_broken_result(struct mmc_test_card *test,
        struct mmc_request *mrq)
{
        int ret;

        if (WARN_ON(!mrq || !mrq->cmd || !mrq->data))
                return -EINVAL;

        ret = 0;

        if (!ret && mrq->cmd->error)
                ret = mrq->cmd->error;
        if (!ret && mrq->data->error == 0)
                ret = RESULT_FAIL;
        if (!ret && mrq->data->error != -ETIMEDOUT)
                ret = mrq->data->error;
        if (!ret && mrq->stop && mrq->stop->error)
                ret = mrq->stop->error;
        if (mrq->data->blocks > 1) {
                if (!ret && mrq->data->bytes_xfered > mrq->data->blksz)
                        ret = RESULT_FAIL;
        } else {
                if (!ret && mrq->data->bytes_xfered > 0)
                        ret = RESULT_FAIL;
        }

        if (ret == -EINVAL)
                ret = RESULT_UNSUP_HOST;

        return ret;
}

struct mmc_test_req {
        struct mmc_request mrq;
        struct mmc_command sbc;
        struct mmc_command cmd;
        struct mmc_command stop;
        struct mmc_command status;
        struct mmc_data data;
};

/*
 * Tests nonblock transfer with certain parameters
 */
static void mmc_test_req_reset(struct mmc_test_req *rq)
{
        memset(rq, 0, sizeof(struct mmc_test_req));

        rq->mrq.cmd = &rq->cmd;
        rq->mrq.data = &rq->data;
        rq->mrq.stop = &rq->stop;
}

static struct mmc_test_req *mmc_test_req_alloc(void)
{
        struct mmc_test_req *rq = kmalloc(sizeof(*rq), GFP_KERNEL);

        if (rq)
                mmc_test_req_reset(rq);

        return rq;
}

static void mmc_test_wait_done(struct mmc_request *mrq)
{
        complete(&mrq->completion);
}

static int mmc_test_start_areq(struct mmc_test_card *test,
                               struct mmc_request *mrq,
                               struct mmc_request *prev_mrq)
{
        struct mmc_host *host = test->card->host;
        int err = 0;

        if (mrq) {
                init_completion(&mrq->completion);
                mrq->done = mmc_test_wait_done;
                mmc_pre_req(host, mrq);
        }

        if (prev_mrq) {
                wait_for_completion(&prev_mrq->completion);
                err = mmc_test_wait_busy(test);
                if (!err)
                        err = mmc_test_check_result(test, prev_mrq);
        }

        if (!err && mrq) {
                err = mmc_start_request(host, mrq);
                if (err)
                        mmc_retune_release(host);
        }

        if (prev_mrq)
                mmc_post_req(host, prev_mrq, 0);

        if (err && mrq)
                mmc_post_req(host, mrq, err);

        return err;
}

static int mmc_test_nonblock_transfer(struct mmc_test_card *test,
                                      unsigned int dev_addr, int write,
                                      int count)
{
        struct mmc_test_req *rq1, *rq2;
        struct mmc_request *mrq, *prev_mrq;
        int i;
        int ret = RESULT_OK;
        struct mmc_test_area *t = &test->area;
        struct scatterlist *sg = t->sg;
        struct scatterlist *sg_areq = t->sg_areq;

        rq1 = mmc_test_req_alloc();
        rq2 = mmc_test_req_alloc();
        if (!rq1 || !rq2) {
                ret = RESULT_FAIL;
                goto err;
        }

        mrq = &rq1->mrq;
        prev_mrq = NULL;

        for (i = 0; i < count; i++) {
                mmc_test_req_reset(container_of(mrq, struct mmc_test_req, mrq));
                mmc_test_prepare_mrq(test, mrq, sg, t->sg_len, dev_addr,
                                     t->blocks, 512, write);
                ret = mmc_test_start_areq(test, mrq, prev_mrq);
                if (ret)
                        goto err;

                if (!prev_mrq)
                        prev_mrq = &rq2->mrq;

                swap(mrq, prev_mrq);
                swap(sg, sg_areq);
                dev_addr += t->blocks;
        }

        ret = mmc_test_start_areq(test, NULL, prev_mrq);
err:
        kfree(rq1);
        kfree(rq2);
        return ret;
}

/*
 * Tests a basic transfer with certain parameters
 */
static int mmc_test_simple_transfer(struct mmc_test_card *test,
        struct scatterlist *sg, unsigned sg_len, unsigned dev_addr,
        unsigned blocks, unsigned blksz, int write)
{
        struct mmc_request mrq = {};
        struct mmc_command cmd = {};
        struct mmc_command stop = {};
        struct mmc_data data = {};

        mrq.cmd = &cmd;
        mrq.data = &data;
        mrq.stop = &stop;

        mmc_test_prepare_mrq(test, &mrq, sg, sg_len, dev_addr,
                blocks, blksz, write);

        mmc_wait_for_req(test->card->host, &mrq);

        mmc_test_wait_busy(test);

        return mmc_test_check_result(test, &mrq);
}

/*
 * Tests a transfer where the card will fail completely or partly
 */
static int mmc_test_broken_transfer(struct mmc_test_card *test,
        unsigned blocks, unsigned blksz, int write)
{
        struct mmc_request mrq = {};
        struct mmc_command cmd = {};
        struct mmc_command stop = {};
        struct mmc_data data = {};

        struct scatterlist sg;

        mrq.cmd = &cmd;
        mrq.data = &data;
        mrq.stop = &stop;

        sg_init_one(&sg, test->buffer, blocks * blksz);

        mmc_test_prepare_mrq(test, &mrq, &sg, 1, 0, blocks, blksz, write);
        mmc_test_prepare_broken_mrq(test, &mrq, write);

        mmc_wait_for_req(test->card->host, &mrq);

        mmc_test_wait_busy(test);

        return mmc_test_check_broken_result(test, &mrq);
}

/*
 * Does a complete transfer test where data is also validated
 *
 * Note: mmc_test_prepare() must have been done before this call
 */
static int mmc_test_transfer(struct mmc_test_card *test,
        struct scatterlist *sg, unsigned sg_len, unsigned dev_addr,
        unsigned blocks, unsigned blksz, int write)
{
        int ret, i;
        unsigned long flags;

        if (write) {
                for (i = 0; i < blocks * blksz; i++)
                        test->scratch[i] = i;
        } else {
                memset(test->scratch, 0, BUFFER_SIZE);
        }
        local_irq_save(flags);
        sg_copy_from_buffer(sg, sg_len, test->scratch, BUFFER_SIZE);
        local_irq_restore(flags);

        ret = mmc_test_set_blksize(test, blksz);
        if (ret)
                return ret;

        ret = mmc_test_simple_transfer(test, sg, sg_len, dev_addr,
                blocks, blksz, write);
        if (ret)
                return ret;

        if (write) {
                int sectors;

                ret = mmc_test_set_blksize(test, 512);
                if (ret)
                        return ret;

                sectors = (blocks * blksz + 511) / 512;
                if ((sectors * 512) == (blocks * blksz))
                        sectors++;

                if ((sectors * 512) > BUFFER_SIZE)
                        return -EINVAL;

                memset(test->buffer, 0, sectors * 512);

                for (i = 0; i < sectors; i++) {
                        ret = mmc_test_buffer_transfer(test,
                                test->buffer + i * 512,
                                dev_addr + i, 512, 0);
                        if (ret)
                                return ret;
                }

                for (i = 0; i < blocks * blksz; i++) {
                        if (test->buffer[i] != (u8)i)
                                return RESULT_FAIL;
                }

                for (; i < sectors * 512; i++) {

                        if (test->buffer[i] != 0xDF)
                                return RESULT_FAIL;
                }
        } else {
                local_irq_save(flags);
                sg_copy_to_buffer(sg, sg_len, test->scratch, BUFFER_SIZE);
                local_irq_restore(flags);
                for (i = 0; i < blocks * blksz; i++) {
                        if (test->scratch[i] != (u8)i)
                                return RESULT_FAIL;
                }
        }

        return 0;
}

/*******************************************************************/
/*  Tests                                                          */
/*******************************************************************/

struct mmc_test_case {
        const char *name;

        int (*prepare)(struct mmc_test_card *);
        int (*run)(struct mmc_test_card *);
        int (*cleanup)(struct mmc_test_card *);
};

static int mmc_test_basic_write(struct mmc_test_card *test)
{
        int ret;
        struct scatterlist sg;

        ret = mmc_test_set_blksize(test, 512);
        if (ret)
                return ret;

        sg_init_one(&sg, test->buffer, 512);

        return mmc_test_simple_transfer(test, &sg, 1, 0, 1, 512, 1);
}

static int mmc_test_basic_read(struct mmc_test_card *test)
{
        int ret;
        struct scatterlist sg;

        ret = mmc_test_set_blksize(test, 512);
        if (ret)
                return ret;

        sg_init_one(&sg, test->buffer, 512);

        return mmc_test_simple_transfer(test, &sg, 1, 0, 1, 512, 0);
}

static int mmc_test_verify_write(struct mmc_test_card *test)
{
        struct scatterlist sg;

        sg_init_one(&sg, test->buffer, 512);

        return mmc_test_transfer(test, &sg, 1, 0, 1, 512, 1);
}

static int mmc_test_verify_read(struct mmc_test_card *test)
{
        struct scatterlist sg;

        sg_init_one(&sg, test->buffer, 512);

        return mmc_test_transfer(test, &sg, 1, 0, 1, 512, 0);
}

static int mmc_test_multi_write(struct mmc_test_card *test)
{
        unsigned int size;
        struct scatterlist sg;

        if (test->card->host->max_blk_count == 1)
                return RESULT_UNSUP_HOST;

        size = PAGE_SIZE * 2;
        size = min(size, test->card->host->max_req_size);
        size = min(size, test->card->host->max_seg_size);
        size = min(size, test->card->host->max_blk_count * 512);

        if (size < 1024)
                return RESULT_UNSUP_HOST;

        sg_init_one(&sg, test->buffer, size);

        return mmc_test_transfer(test, &sg, 1, 0, size / 512, 512, 1);
}

static int mmc_test_multi_read(struct mmc_test_card *test)
{
        unsigned int size;
        struct scatterlist sg;

        if (test->card->host->max_blk_count == 1)
                return RESULT_UNSUP_HOST;

        size = PAGE_SIZE * 2;
        size = min(size, test->card->host->max_req_size);
        size = min(size, test->card->host->max_seg_size);
        size = min(size, test->card->host->max_blk_count * 512);

        if (size < 1024)
                return RESULT_UNSUP_HOST;

        sg_init_one(&sg, test->buffer, size);

        return mmc_test_transfer(test, &sg, 1, 0, size / 512, 512, 0);
}

static int mmc_test_pow2_write(struct mmc_test_card *test)
{
        int ret, i;
        struct scatterlist sg;

        if (!test->card->csd.write_partial)
                return RESULT_UNSUP_CARD;

        for (i = 1; i < 512; i <<= 1) {
                sg_init_one(&sg, test->buffer, i);
                ret = mmc_test_transfer(test, &sg, 1, 0, 1, i, 1);
                if (ret)
                        return ret;
        }

        return 0;
}

static int mmc_test_pow2_read(struct mmc_test_card *test)
{
        int ret, i;
        struct scatterlist sg;

        if (!test->card->csd.read_partial)
                return RESULT_UNSUP_CARD;

        for (i = 1; i < 512; i <<= 1) {
                sg_init_one(&sg, test->buffer, i);
                ret = mmc_test_transfer(test, &sg, 1, 0, 1, i, 0);
                if (ret)
                        return ret;
        }

        return 0;
}

static int mmc_test_weird_write(struct mmc_test_card *test)
{
        int ret, i;
        struct scatterlist sg;

        if (!test->card->csd.write_partial)
                return RESULT_UNSUP_CARD;

        for (i = 3; i < 512; i += 7) {
                sg_init_one(&sg, test->buffer, i);
                ret = mmc_test_transfer(test, &sg, 1, 0, 1, i, 1);
                if (ret)
                        return ret;
        }

        return 0;
}

static int mmc_test_weird_read(struct mmc_test_card *test)
{
        int ret, i;
        struct scatterlist sg;

        if (!test->card->csd.read_partial)
                return RESULT_UNSUP_CARD;

        for (i = 3; i < 512; i += 7) {
                sg_init_one(&sg, test->buffer, i);
                ret = mmc_test_transfer(test, &sg, 1, 0, 1, i, 0);
                if (ret)
                        return ret;
        }

        return 0;
}

static int mmc_test_align_write(struct mmc_test_card *test)
{
        int ret, i;
        struct scatterlist sg;

        for (i = 1; i < TEST_ALIGN_END; i++) {
                sg_init_one(&sg, test->buffer + i, 512);
                ret = mmc_test_transfer(test, &sg, 1, 0, 1, 512, 1);
                if (ret)
                        return ret;
        }

        return 0;
}

static int mmc_test_align_read(struct mmc_test_card *test)
{
        int ret, i;
        struct scatterlist sg;

        for (i = 1; i < TEST_ALIGN_END; i++) {
                sg_init_one(&sg, test->buffer + i, 512);
                ret = mmc_test_transfer(test, &sg, 1, 0, 1, 512, 0);
                if (ret)
                        return ret;
        }

        return 0;
}

static int mmc_test_align_multi_write(struct mmc_test_card *test)
{
        int ret, i;
        unsigned int size;
        struct scatterlist sg;

        if (test->card->host->max_blk_count == 1)
                return RESULT_UNSUP_HOST;

        size = PAGE_SIZE * 2;
        size = min(size, test->card->host->max_req_size);
        size = min(size, test->card->host->max_seg_size);
        size = min(size, test->card->host->max_blk_count * 512);

        if (size < 1024)
                return RESULT_UNSUP_HOST;

        for (i = 1; i < TEST_ALIGN_END; i++) {
                sg_init_one(&sg, test->buffer + i, size);
                ret = mmc_test_transfer(test, &sg, 1, 0, size / 512, 512, 1);
                if (ret)
                        return ret;
        }

        return 0;
}

static int mmc_test_align_multi_read(struct mmc_test_card *test)
{
        int ret, i;
        unsigned int size;
        struct scatterlist sg;

        if (test->card->host->max_blk_count == 1)
                return RESULT_UNSUP_HOST;

        size = PAGE_SIZE * 2;
        size = min(size, test->card->host->max_req_size);
        size = min(size, test->card->host->max_seg_size);
        size = min(size, test->card->host->max_blk_count * 512);

        if (size < 1024)
                return RESULT_UNSUP_HOST;

        for (i = 1; i < TEST_ALIGN_END; i++) {
                sg_init_one(&sg, test->buffer + i, size);
                ret = mmc_test_transfer(test, &sg, 1, 0, size / 512, 512, 0);
                if (ret)
                        return ret;
        }

        return 0;
}

static int mmc_test_xfersize_write(struct mmc_test_card *test)
{
        int ret;

        ret = mmc_test_set_blksize(test, 512);
        if (ret)
                return ret;

        return mmc_test_broken_transfer(test, 1, 512, 1);
}

static int mmc_test_xfersize_read(struct mmc_test_card *test)
{
        int ret;

        ret = mmc_test_set_blksize(test, 512);
        if (ret)
                return ret;

        return mmc_test_broken_transfer(test, 1, 512, 0);
}

static int mmc_test_multi_xfersize_write(struct mmc_test_card *test)
{
        int ret;

        if (test->card->host->max_blk_count == 1)
                return RESULT_UNSUP_HOST;

        ret = mmc_test_set_blksize(test, 512);
        if (ret)
                return ret;

        return mmc_test_broken_transfer(test, 2, 512, 1);
}

static int mmc_test_multi_xfersize_read(struct mmc_test_card *test)
{
        int ret;

        if (test->card->host->max_blk_count == 1)
                return RESULT_UNSUP_HOST;

        ret = mmc_test_set_blksize(test, 512);
        if (ret)
                return ret;

        return mmc_test_broken_transfer(test, 2, 512, 0);
}

#ifdef CONFIG_HIGHMEM

static int mmc_test_write_high(struct mmc_test_card *test)
{
        struct scatterlist sg;

        sg_init_table(&sg, 1);
        sg_set_page(&sg, test->highmem, 512, 0);

        return mmc_test_transfer(test, &sg, 1, 0, 1, 512, 1);
}

static int mmc_test_read_high(struct mmc_test_card *test)
{
        struct scatterlist sg;

        sg_init_table(&sg, 1);
        sg_set_page(&sg, test->highmem, 512, 0);

        return mmc_test_transfer(test, &sg, 1, 0, 1, 512, 0);
}

static int mmc_test_multi_write_high(struct mmc_test_card *test)
{
        unsigned int size;
        struct scatterlist sg;

        if (test->card->host->max_blk_count == 1)
                return RESULT_UNSUP_HOST;

        size = PAGE_SIZE * 2;
        size = min(size, test->card->host->max_req_size);
        size = min(size, test->card->host->max_seg_size);
        size = min(size, test->card->host->max_blk_count * 512);

        if (size < 1024)
                return RESULT_UNSUP_HOST;

        sg_init_table(&sg, 1);
        sg_set_page(&sg, test->highmem, size, 0);

        return mmc_test_transfer(test, &sg, 1, 0, size / 512, 512, 1);
}

static int mmc_test_multi_read_high(struct mmc_test_card *test)
{
        unsigned int size;
        struct scatterlist sg;

        if (test->card->host->max_blk_count == 1)
                return RESULT_UNSUP_HOST;

        size = PAGE_SIZE * 2;
        size = min(size, test->card->host->max_req_size);
        size = min(size, test->card->host->max_seg_size);
        size = min(size, test->card->host->max_blk_count * 512);

        if (size < 1024)
                return RESULT_UNSUP_HOST;

        sg_init_table(&sg, 1);
        sg_set_page(&sg, test->highmem, size, 0);

        return mmc_test_transfer(test, &sg, 1, 0, size / 512, 512, 0);
}

#else

static int mmc_test_no_highmem(struct mmc_test_card *test)
{
        pr_info("%s: Highmem not configured - test skipped\n",
               mmc_hostname(test->card->host));
        return 0;
}

#endif /* CONFIG_HIGHMEM */

/*
 * Map sz bytes so that it can be transferred.
 */
static int mmc_test_area_map(struct mmc_test_card *test, unsigned long sz,
                             int max_scatter, int min_sg_len, bool nonblock)
{
        struct mmc_test_area *t = &test->area;
        int err;
        unsigned int sg_len = 0;

        t->blocks = sz >> 9;

        if (max_scatter) {
                err = mmc_test_map_sg_max_scatter(t->mem, sz, t->sg,
                                                  t->max_segs, t->max_seg_sz,
                                       &t->sg_len);
        } else {
                err = mmc_test_map_sg(t->mem, sz, t->sg, 1, t->max_segs,
                                      t->max_seg_sz, &t->sg_len, min_sg_len);
        }

        if (err || !nonblock)
                goto err;

        if (max_scatter) {
                err = mmc_test_map_sg_max_scatter(t->mem, sz, t->sg_areq,
                                                  t->max_segs, t->max_seg_sz,
                                                  &sg_len);
        } else {
                err = mmc_test_map_sg(t->mem, sz, t->sg_areq, 1, t->max_segs,
                                      t->max_seg_sz, &sg_len, min_sg_len);
        }
        if (!err && sg_len != t->sg_len)
                err = -EINVAL;

err:
        if (err)
                pr_info("%s: Failed to map sg list\n",
                       mmc_hostname(test->card->host));
        return err;
}

/*
 * Transfer bytes mapped by mmc_test_area_map().
 */
static int mmc_test_area_transfer(struct mmc_test_card *test,
                                  unsigned int dev_addr, int write)
{
        struct mmc_test_area *t = &test->area;

        return mmc_test_simple_transfer(test, t->sg, t->sg_len, dev_addr,
                                        t->blocks, 512, write);
}

/*
 * Map and transfer bytes for multiple transfers.
 */
static int mmc_test_area_io_seq(struct mmc_test_card *test, unsigned long sz,
                                unsigned int dev_addr, int write,
                                int max_scatter, int timed, int count,
                                bool nonblock, int min_sg_len)
{
        struct timespec64 ts1, ts2;
        int ret = 0;
        int i;

        /*
         * In the case of a maximally scattered transfer, the maximum transfer
         * size is further limited by using PAGE_SIZE segments.
         */
        if (max_scatter) {
                struct mmc_test_area *t = &test->area;
                unsigned long max_tfr;

                if (t->max_seg_sz >= PAGE_SIZE)
                        max_tfr = t->max_segs * PAGE_SIZE;
                else
                        max_tfr = t->max_segs * t->max_seg_sz;
                if (sz > max_tfr)
                        sz = max_tfr;
        }

        ret = mmc_test_area_map(test, sz, max_scatter, min_sg_len, nonblock);
        if (ret)
                return ret;

        if (timed)
                ktime_get_ts64(&ts1);
        if (nonblock)
                ret = mmc_test_nonblock_transfer(test, dev_addr, write, count);
        else
                for (i = 0; i < count && ret == 0; i++) {
                        ret = mmc_test_area_transfer(test, dev_addr, write);
                        dev_addr += sz >> 9;
                }

        if (ret)
                return ret;

        if (timed)
                ktime_get_ts64(&ts2);

        if (timed)
                mmc_test_print_avg_rate(test, sz, count, &ts1, &ts2);

        return 0;
}

static int mmc_test_area_io(struct mmc_test_card *test, unsigned long sz,
                            unsigned int dev_addr, int write, int max_scatter,
                            int timed)
{
        return mmc_test_area_io_seq(test, sz, dev_addr, write, max_scatter,
                                    timed, 1, false, 0);
}

/*
 * Write the test area entirely.
 */
static int mmc_test_area_fill(struct mmc_test_card *test)
{
        struct mmc_test_area *t = &test->area;

        return mmc_test_area_io(test, t->max_tfr, t->dev_addr, 1, 0, 0);
}

/*
 * Erase the test area entirely.
 */
static int mmc_test_area_erase(struct mmc_test_card *test)
{
        struct mmc_test_area *t = &test->area;

        if (!mmc_can_erase(test->card))
                return 0;

        return mmc_erase(test->card, t->dev_addr, t->max_sz >> 9,
                         MMC_ERASE_ARG);
}

/*
 * Cleanup struct mmc_test_area.
 */
static int mmc_test_area_cleanup(struct mmc_test_card *test)
{
        struct mmc_test_area *t = &test->area;

        kfree(t->sg);
        kfree(t->sg_areq);
        mmc_test_free_mem(t->mem);

        return 0;
}

/*
 * Initialize an area for testing large transfers.  The test area is set to the
 * middle of the card because cards may have different characteristics at the
 * front (for FAT file system optimization).  Optionally, the area is erased
 * (if the card supports it) which may improve write performance.  Optionally,
 * the area is filled with data for subsequent read tests.
 */
static int mmc_test_area_init(struct mmc_test_card *test, int erase, int fill)
{
        struct mmc_test_area *t = &test->area;
        unsigned long min_sz = 64 * 1024, sz;
        int ret;

        ret = mmc_test_set_blksize(test, 512);
        if (ret)
                return ret;

        /* Make the test area size about 4MiB */
        sz = (unsigned long)test->card->pref_erase << 9;
        t->max_sz = sz;
        while (t->max_sz < 4 * 1024 * 1024)
                t->max_sz += sz;
        while (t->max_sz > TEST_AREA_MAX_SIZE && t->max_sz > sz)
                t->max_sz -= sz;

        t->max_segs = test->card->host->max_segs;
        t->max_seg_sz = test->card->host->max_seg_size;
        t->max_seg_sz -= t->max_seg_sz % 512;

        t->max_tfr = t->max_sz;
        if (t->max_tfr >> 9 > test->card->host->max_blk_count)
                t->max_tfr = test->card->host->max_blk_count << 9;
        if (t->max_tfr > test->card->host->max_req_size)
                t->max_tfr = test->card->host->max_req_size;
        if (t->max_tfr / t->max_seg_sz > t->max_segs)
                t->max_tfr = t->max_segs * t->max_seg_sz;

        /*
         * Try to allocate enough memory for a max. sized transfer.  Less is OK
         * because the same memory can be mapped into the scatterlist more than
         * once.  Also, take into account the limits imposed on scatterlist
         * segments by the host driver.
         */
        t->mem = mmc_test_alloc_mem(min_sz, t->max_tfr, t->max_segs,
                                    t->max_seg_sz);
        if (!t->mem)
                return -ENOMEM;

        t->sg = kmalloc_array(t->max_segs, sizeof(*t->sg), GFP_KERNEL);
        if (!t->sg) {
                ret = -ENOMEM;
                goto out_free;
        }

        t->sg_areq = kmalloc_array(t->max_segs, sizeof(*t->sg_areq),
                                   GFP_KERNEL);
        if (!t->sg_areq) {
                ret = -ENOMEM;
                goto out_free;
        }

        t->dev_addr = mmc_test_capacity(test->card) / 2;
        t->dev_addr -= t->dev_addr % (t->max_sz >> 9);

        if (erase) {
                ret = mmc_test_area_erase(test);
                if (ret)
                        goto out_free;
        }

        if (fill) {
                ret = mmc_test_area_fill(test);
                if (ret)
                        goto out_free;
        }

        return 0;

out_free:
        mmc_test_area_cleanup(test);
        return ret;
}

/*
 * Prepare for large transfers.  Do not erase the test area.
 */
static int mmc_test_area_prepare(struct mmc_test_card *test)
{
        return mmc_test_area_init(test, 0, 0);
}

/*
 * Prepare for large transfers.  Do erase the test area.
 */
static int mmc_test_area_prepare_erase(struct mmc_test_card *test)
{
        return mmc_test_area_init(test, 1, 0);
}

/*
 * Prepare for large transfers.  Erase and fill the test area.
 */
static int mmc_test_area_prepare_fill(struct mmc_test_card *test)
{
        return mmc_test_area_init(test, 1, 1);
}

/*
 * Test best-case performance.  Best-case performance is expected from
 * a single large transfer.
 *
 * An additional option (max_scatter) allows the measurement of the same
 * transfer but with no contiguous pages in the scatter list.  This tests
 * the efficiency of DMA to handle scattered pages.
 */
static int mmc_test_best_performance(struct mmc_test_card *test, int write,
                                     int max_scatter)
{
        struct mmc_test_area *t = &test->area;

        return mmc_test_area_io(test, t->max_tfr, t->dev_addr, write,
                                max_scatter, 1);
}

/*
 * Best-case read performance.
 */
static int mmc_test_best_read_performance(struct mmc_test_card *test)
{
        return mmc_test_best_performance(test, 0, 0);
}

/*
 * Best-case write performance.
 */
static int mmc_test_best_write_performance(struct mmc_test_card *test)
{
        return mmc_test_best_performance(test, 1, 0);
}

/*
 * Best-case read performance into scattered pages.
 */
static int mmc_test_best_read_perf_max_scatter(struct mmc_test_card *test)
{
        return mmc_test_best_performance(test, 0, 1);
}

/*
 * Best-case write performance from scattered pages.
 */
static int mmc_test_best_write_perf_max_scatter(struct mmc_test_card *test)
{
        return mmc_test_best_performance(test, 1, 1);
}

/*
 * Single read performance by transfer size.
 */
static int mmc_test_profile_read_perf(struct mmc_test_card *test)
{
        struct mmc_test_area *t = &test->area;
        unsigned long sz;
        unsigned int dev_addr;
        int ret;

        for (sz = 512; sz < t->max_tfr; sz <<= 1) {
                dev_addr = t->dev_addr + (sz >> 9);
                ret = mmc_test_area_io(test, sz, dev_addr, 0, 0, 1);
                if (ret)
                        return ret;
        }
        sz = t->max_tfr;
        dev_addr = t->dev_addr;
        return mmc_test_area_io(test, sz, dev_addr, 0, 0, 1);
}

/*
 * Single write performance by transfer size.
 */
static int mmc_test_profile_write_perf(struct mmc_test_card *test)
{
        struct mmc_test_area *t = &test->area;
        unsigned long sz;
        unsigned int dev_addr;
        int ret;

        ret = mmc_test_area_erase(test);
        if (ret)
                return ret;
        for (sz = 512; sz < t->max_tfr; sz <<= 1) {
                dev_addr = t->dev_addr + (sz >> 9);
                ret = mmc_test_area_io(test, sz, dev_addr, 1, 0, 1);
                if (ret)
                        return ret;
        }
        ret = mmc_test_area_erase(test);
        if (ret)
                return ret;
        sz = t->max_tfr;
        dev_addr = t->dev_addr;
        return mmc_test_area_io(test, sz, dev_addr, 1, 0, 1);
}

/*
 * Single trim performance by transfer size.
 */
static int mmc_test_profile_trim_perf(struct mmc_test_card *test)
{
        struct mmc_test_area *t = &test->area;
        unsigned long sz;
        unsigned int dev_addr;
        struct timespec64 ts1, ts2;
        int ret;

        if (!mmc_can_trim(test->card))
                return RESULT_UNSUP_CARD;

        if (!mmc_can_erase(test->card))
                return RESULT_UNSUP_HOST;

        for (sz = 512; sz < t->max_sz; sz <<= 1) {
                dev_addr = t->dev_addr + (sz >> 9);
                ktime_get_ts64(&ts1);
                ret = mmc_erase(test->card, dev_addr, sz >> 9, MMC_TRIM_ARG);
                if (ret)
                        return ret;
                ktime_get_ts64(&ts2);
                mmc_test_print_rate(test, sz, &ts1, &ts2);
        }
        dev_addr = t->dev_addr;
        ktime_get_ts64(&ts1);
        ret = mmc_erase(test->card, dev_addr, sz >> 9, MMC_TRIM_ARG);
        if (ret)
                return ret;
        ktime_get_ts64(&ts2);
        mmc_test_print_rate(test, sz, &ts1, &ts2);
        return 0;
}

static int mmc_test_seq_read_perf(struct mmc_test_card *test, unsigned long sz)
{
        struct mmc_test_area *t = &test->area;
        unsigned int dev_addr, i, cnt;
        struct timespec64 ts1, ts2;
        int ret;

        cnt = t->max_sz / sz;
        dev_addr = t->dev_addr;
        ktime_get_ts64(&ts1);
        for (i = 0; i < cnt; i++) {
                ret = mmc_test_area_io(test, sz, dev_addr, 0, 0, 0);
                if (ret)
                        return ret;
                dev_addr += (sz >> 9);
        }
        ktime_get_ts64(&ts2);
        mmc_test_print_avg_rate(test, sz, cnt, &ts1, &ts2);
        return 0;
}

/*
 * Consecutive read performance by transfer size.
 */
static int mmc_test_profile_seq_read_perf(struct mmc_test_card *test)
{
        struct mmc_test_area *t = &test->area;
        unsigned long sz;
        int ret;

        for (sz = 512; sz < t->max_tfr; sz <<= 1) {
                ret = mmc_test_seq_read_perf(test, sz);
                if (ret)
                        return ret;
        }
        sz = t->max_tfr;
        return mmc_test_seq_read_perf(test, sz);
}

static int mmc_test_seq_write_perf(struct mmc_test_card *test, unsigned long sz)
{
        struct mmc_test_area *t = &test->area;
        unsigned int dev_addr, i, cnt;
        struct timespec64 ts1, ts2;
        int ret;

        ret = mmc_test_area_erase(test);
        if (ret)
                return ret;
        cnt = t->max_sz / sz;
        dev_addr = t->dev_addr;
        ktime_get_ts64(&ts1);
        for (i = 0; i < cnt; i++) {
                ret = mmc_test_area_io(test, sz, dev_addr, 1, 0, 0);
                if (ret)
                        return ret;
                dev_addr += (sz >> 9);
        }
        ktime_get_ts64(&ts2);
        mmc_test_print_avg_rate(test, sz, cnt, &ts1, &ts2);
        return 0;
}

/*
 * Consecutive write performance by transfer size.
 */
static int mmc_test_profile_seq_write_perf(struct mmc_test_card *test)
{
        struct mmc_test_area *t = &test->area;
        unsigned long sz;
        int ret;

        for (sz = 512; sz < t->max_tfr; sz <<= 1) {
                ret = mmc_test_seq_write_perf(test, sz);
                if (ret)
                        return ret;
        }
        sz = t->max_tfr;
        return mmc_test_seq_write_perf(test, sz);
}

/*
 * Consecutive trim performance by transfer size.
 */
static int mmc_test_profile_seq_trim_perf(struct mmc_test_card *test)
{
        struct mmc_test_area *t = &test->area;
        unsigned long sz;
        unsigned int dev_addr, i, cnt;
        struct timespec64 ts1, ts2;
        int ret;

        if (!mmc_can_trim(test->card))
                return RESULT_UNSUP_CARD;

        if (!mmc_can_erase(test->card))
                return RESULT_UNSUP_HOST;

        for (sz = 512; sz <= t->max_sz; sz <<= 1) {
                ret = mmc_test_area_erase(test);
                if (ret)
                        return ret;
                ret = mmc_test_area_fill(test);
                if (ret)
                        return ret;
                cnt = t->max_sz / sz;
                dev_addr = t->dev_addr;
                ktime_get_ts64(&ts1);
                for (i = 0; i < cnt; i++) {
                        ret = mmc_erase(test->card, dev_addr, sz >> 9,
                                        MMC_TRIM_ARG);
                        if (ret)
                                return ret;
                        dev_addr += (sz >> 9);
                }
                ktime_get_ts64(&ts2);
                mmc_test_print_avg_rate(test, sz, cnt, &ts1, &ts2);
        }
        return 0;
}

static unsigned int rnd_next = 1;

static unsigned int mmc_test_rnd_num(unsigned int rnd_cnt)
{
        uint64_t r;

        rnd_next = rnd_next * 1103515245 + 12345;
        r = (rnd_next >> 16) & 0x7fff;
        return (r * rnd_cnt) >> 15;
}

static int mmc_test_rnd_perf(struct mmc_test_card *test, int write, int print,
                             unsigned long sz)
{
        unsigned int dev_addr, cnt, rnd_addr, range1, range2, last_ea = 0, ea;
        unsigned int ssz;
        struct timespec64 ts1, ts2, ts;
        int ret;

        ssz = sz >> 9;

        rnd_addr = mmc_test_capacity(test->card) / 4;
        range1 = rnd_addr / test->card->pref_erase;
        range2 = range1 / ssz;

        ktime_get_ts64(&ts1);
        for (cnt = 0; cnt < UINT_MAX; cnt++) {
                ktime_get_ts64(&ts2);
                ts = timespec64_sub(ts2, ts1);
                if (ts.tv_sec >= 10)
                        break;
                ea = mmc_test_rnd_num(range1);
                if (ea == last_ea)
                        ea -= 1;
                last_ea = ea;
                dev_addr = rnd_addr + test->card->pref_erase * ea +
                           ssz * mmc_test_rnd_num(range2);
                ret = mmc_test_area_io(test, sz, dev_addr, write, 0, 0);
                if (ret)
                        return ret;
        }
        if (print)
                mmc_test_print_avg_rate(test, sz, cnt, &ts1, &ts2);
        return 0;
}

static int mmc_test_random_perf(struct mmc_test_card *test, int write)
{
        struct mmc_test_area *t = &test->area;
        unsigned int next;
        unsigned long sz;
        int ret;

        for (sz = 512; sz < t->max_tfr; sz <<= 1) {
                /*
                 * When writing, try to get more consistent results by running
                 * the test twice with exactly the same I/O but outputting the
                 * results only for the 2nd run.
                 */
                if (write) {
                        next = rnd_next;
                        ret = mmc_test_rnd_perf(test, write, 0, sz);
                        if (ret)
                                return ret;
                        rnd_next = next;
                }
                ret = mmc_test_rnd_perf(test, write, 1, sz);
                if (ret)
                        return ret;
        }
        sz = t->max_tfr;
        if (write) {
                next = rnd_next;
                ret = mmc_test_rnd_perf(test, write, 0, sz);
                if (ret)
                        return ret;
                rnd_next = next;
        }
        return mmc_test_rnd_perf(test, write, 1, sz);
}

/*
 * Random read performance by transfer size.
 */
static int mmc_test_random_read_perf(struct mmc_test_card *test)
{

        return mmc_test_random_perf(test, 0);
}

/*
 * Random write performance by transfer size.
 */
static int mmc_test_random_write_perf(struct mmc_test_card *test)
{
        return mmc_test_random_perf(test, 1);
}

static int mmc_test_seq_perf(struct mmc_test_card *test, int write,
                             unsigned int tot_sz, int max_scatter)
{
        struct mmc_test_area *t = &test->area;
        unsigned int dev_addr, i, cnt, sz, ssz;
        struct timespec64 ts1, ts2;
        int ret;

        sz = t->max_tfr;

        /*
         * In the case of a maximally scattered transfer, the maximum transfer
         * size is further limited by using PAGE_SIZE segments.
         */
        if (max_scatter) {
                unsigned long max_tfr;

                if (t->max_seg_sz >= PAGE_SIZE)
                        max_tfr = t->max_segs * PAGE_SIZE;
                else
                        max_tfr = t->max_segs * t->max_seg_sz;
                if (sz > max_tfr)
                        sz = max_tfr;
        }

        ssz = sz >> 9;
        dev_addr = mmc_test_capacity(test->card) / 4;
        if (tot_sz > dev_addr << 9)
                tot_sz = dev_addr << 9;
        cnt = tot_sz / sz;
        dev_addr &= 0xffff0000; /* Round to 64MiB boundary */

        ktime_get_ts64(&ts1);
        for (i = 0; i < cnt; i++) {
                ret = mmc_test_area_io(test, sz, dev_addr, write,
                                       max_scatter, 0);
                if (ret)
                        return ret;
                dev_addr += ssz;
        }
        ktime_get_ts64(&ts2);

        mmc_test_print_avg_rate(test, sz, cnt, &ts1, &ts2);

        return 0;
}

static int mmc_test_large_seq_perf(struct mmc_test_card *test, int write)
{
        int ret, i;

        for (i = 0; i < 10; i++) {
                ret = mmc_test_seq_perf(test, write, 10 * 1024 * 1024, 1);
                if (ret)
                        return ret;
        }
        for (i = 0; i < 5; i++) {
                ret = mmc_test_seq_perf(test, write, 100 * 1024 * 1024, 1);
                if (ret)
                        return ret;
        }
        for (i = 0; i < 3; i++) {
                ret = mmc_test_seq_perf(test, write, 1000 * 1024 * 1024, 1);
                if (ret)
                        return ret;
        }

        return ret;
}

/*
 * Large sequential read performance.
 */
static int mmc_test_large_seq_read_perf(struct mmc_test_card *test)
{
        return mmc_test_large_seq_perf(test, 0);
}

/*
 * Large sequential write performance.
 */
static int mmc_test_large_seq_write_perf(struct mmc_test_card *test)
{
        return mmc_test_large_seq_perf(test, 1);
}

static int mmc_test_rw_multiple(struct mmc_test_card *test,
                                struct mmc_test_multiple_rw *tdata,
                                unsigned int reqsize, unsigned int size,
                                int min_sg_len)
{
        unsigned int dev_addr;
        struct mmc_test_area *t = &test->area;
        int ret = 0;

        /* Set up test area */
        if (size > mmc_test_capacity(test->card) / 2 * 512)
                size = mmc_test_capacity(test->card) / 2 * 512;
        if (reqsize > t->max_tfr)
                reqsize = t->max_tfr;
        dev_addr = mmc_test_capacity(test->card) / 4;
        if ((dev_addr & 0xffff0000))
                dev_addr &= 0xffff0000; /* Round to 64MiB boundary */
        else
                dev_addr &= 0xfffff800; /* Round to 1MiB boundary */
        if (!dev_addr)
                goto err;

        if (reqsize > size)
                return 0;

        /* prepare test area */
        if (mmc_can_erase(test->card) &&
            tdata->prepare & MMC_TEST_PREP_ERASE) {
                ret = mmc_erase(test->card, dev_addr,
                                size / 512, MMC_SECURE_ERASE_ARG);
                if (ret)
                        ret = mmc_erase(test->card, dev_addr,
                                        size / 512, MMC_ERASE_ARG);
                if (ret)
                        goto err;
        }

        /* Run test */
        ret = mmc_test_area_io_seq(test, reqsize, dev_addr,
                                   tdata->do_write, 0, 1, size / reqsize,
                                   tdata->do_nonblock_req, min_sg_len);
        if (ret)
                goto err;

        return ret;
 err:
        pr_info("[%s] error\n", __func__);
        return ret;
}

static int mmc_test_rw_multiple_size(struct mmc_test_card *test,
                                     struct mmc_test_multiple_rw *rw)
{
        int ret = 0;
        int i;
        void *pre_req = test->card->host->ops->pre_req;
        void *post_req = test->card->host->ops->post_req;

        if (rw->do_nonblock_req &&
            ((!pre_req && post_req) || (pre_req && !post_req))) {
                pr_info("error: only one of pre/post is defined\n");
                return -EINVAL;
        }

        for (i = 0 ; i < rw->len && ret == 0; i++) {
                ret = mmc_test_rw_multiple(test, rw, rw->bs[i], rw->size, 0);
                if (ret)
                        break;
        }
        return ret;
}

static int mmc_test_rw_multiple_sg_len(struct mmc_test_card *test,
                                       struct mmc_test_multiple_rw *rw)
{
        int ret = 0;
        int i;

        for (i = 0 ; i < rw->len && ret == 0; i++) {
                ret = mmc_test_rw_multiple(test, rw, 512 * 1024, rw->size,
                                           rw->sg_len[i]);
                if (ret)
                        break;
        }
        return ret;
}

/*
 * Multiple blocking write 4k to 4 MB chunks
 */
static int mmc_test_profile_mult_write_blocking_perf(struct mmc_test_card *test)
{
        unsigned int bs[] = {1 << 12, 1 << 13, 1 << 14, 1 << 15, 1 << 16,
                             1 << 17, 1 << 18, 1 << 19, 1 << 20, 1 << 22};
        struct mmc_test_multiple_rw test_data = {
                .bs = bs,
                .size = TEST_AREA_MAX_SIZE,
                .len = ARRAY_SIZE(bs),
                .do_write = true,
                .do_nonblock_req = false,
                .prepare = MMC_TEST_PREP_ERASE,
        };

        return mmc_test_rw_multiple_size(test, &test_data);
};

/*
 * Multiple non-blocking write 4k to 4 MB chunks
 */
static int mmc_test_profile_mult_write_nonblock_perf(struct mmc_test_card *test)
{
        unsigned int bs[] = {1 << 12, 1 << 13, 1 << 14, 1 << 15, 1 << 16,
                             1 << 17, 1 << 18, 1 << 19, 1 << 20, 1 << 22};
        struct mmc_test_multiple_rw test_data = {
                .bs = bs,
                .size = TEST_AREA_MAX_SIZE,
                .len = ARRAY_SIZE(bs),
                .do_write = true,
                .do_nonblock_req = true,
                .prepare = MMC_TEST_PREP_ERASE,
        };

        return mmc_test_rw_multiple_size(test, &test_data);
}

/*
 * Multiple blocking read 4k to 4 MB chunks
 */
static int mmc_test_profile_mult_read_blocking_perf(struct mmc_test_card *test)
{
        unsigned int bs[] = {1 << 12, 1 << 13, 1 << 14, 1 << 15, 1 << 16,
                             1 << 17, 1 << 18, 1 << 19, 1 << 20, 1 << 22};
        struct mmc_test_multiple_rw test_data = {
                .bs = bs,
                .size = TEST_AREA_MAX_SIZE,
                .len = ARRAY_SIZE(bs),
                .do_write = false,
                .do_nonblock_req = false,
                .prepare = MMC_TEST_PREP_NONE,
        };

        return mmc_test_rw_multiple_size(test, &test_data);
}

/*
 * Multiple non-blocking read 4k to 4 MB chunks
 */
static int mmc_test_profile_mult_read_nonblock_perf(struct mmc_test_card *test)
{
        unsigned int bs[] = {1 << 12, 1 << 13, 1 << 14, 1 << 15, 1 << 16,
                             1 << 17, 1 << 18, 1 << 19, 1 << 20, 1 << 22};
        struct mmc_test_multiple_rw test_data = {
                .bs = bs,
                .size = TEST_AREA_MAX_SIZE,
                .len = ARRAY_SIZE(bs),
                .do_write = false,
                .do_nonblock_req = true,
                .prepare = MMC_TEST_PREP_NONE,
        };

        return mmc_test_rw_multiple_size(test, &test_data);
}

/*
 * Multiple blocking write 1 to 512 sg elements
 */
static int mmc_test_profile_sglen_wr_blocking_perf(struct mmc_test_card *test)
{
        unsigned int sg_len[] = {1, 1 << 3, 1 << 4, 1 << 5, 1 << 6,
                                 1 << 7, 1 << 8, 1 << 9};
        struct mmc_test_multiple_rw test_data = {
                .sg_len = sg_len,
                .size = TEST_AREA_MAX_SIZE,
                .len = ARRAY_SIZE(sg_len),
                .do_write = true,
                .do_nonblock_req = false,
                .prepare = MMC_TEST_PREP_ERASE,
        };

        return mmc_test_rw_multiple_sg_len(test, &test_data);
};

/*
 * Multiple non-blocking write 1 to 512 sg elements
 */
static int mmc_test_profile_sglen_wr_nonblock_perf(struct mmc_test_card *test)
{
        unsigned int sg_len[] = {1, 1 << 3, 1 << 4, 1 << 5, 1 << 6,
                                 1 << 7, 1 << 8, 1 << 9};
        struct mmc_test_multiple_rw test_data = {
                .sg_len = sg_len,
                .size = TEST_AREA_MAX_SIZE,
                .len = ARRAY_SIZE(sg_len),
                .do_write = true,
                .do_nonblock_req = true,
                .prepare = MMC_TEST_PREP_ERASE,
        };

        return mmc_test_rw_multiple_sg_len(test, &test_data);
}

/*
 * Multiple blocking read 1 to 512 sg elements
 */
static int mmc_test_profile_sglen_r_blocking_perf(struct mmc_test_card *test)
{
        unsigned int sg_len[] = {1, 1 << 3, 1 << 4, 1 << 5, 1 << 6,
                                 1 << 7, 1 << 8, 1 << 9};
        struct mmc_test_multiple_rw test_data = {
                .sg_len = sg_len,
                .size = TEST_AREA_MAX_SIZE,
                .len = ARRAY_SIZE(sg_len),
                .do_write = false,
                .do_nonblock_req = false,
                .prepare = MMC_TEST_PREP_NONE,
        };

        return mmc_test_rw_multiple_sg_len(test, &test_data);
}

/*
 * Multiple non-blocking read 1 to 512 sg elements
 */
static int mmc_test_profile_sglen_r_nonblock_perf(struct mmc_test_card *test)
{
        unsigned int sg_len[] = {1, 1 << 3, 1 << 4, 1 << 5, 1 << 6,
                                 1 << 7, 1 << 8, 1 << 9};
        struct mmc_test_multiple_rw test_data = {
                .sg_len = sg_len,
                .size = TEST_AREA_MAX_SIZE,
                .len = ARRAY_SIZE(sg_len),
                .do_write = false,
                .do_nonblock_req = true,
                .prepare = MMC_TEST_PREP_NONE,
        };

        return mmc_test_rw_multiple_sg_len(test, &test_data);
}

/*
 * eMMC hardware reset.
 */
static int mmc_test_reset(struct mmc_test_card *test)
{
        struct mmc_card *card = test->card;
        struct mmc_host *host = card->host;
        int err;

        err = mmc_hw_reset(host);
        if (!err) {
                /*
                 * Reset will re-enable the card's command queue, but tests
                 * expect it to be disabled.
                 */
                if (card->ext_csd.cmdq_en)
                        mmc_cmdq_disable(card);
                return RESULT_OK;
        } else if (err == -EOPNOTSUPP) {
                return RESULT_UNSUP_HOST;
        }

        return RESULT_FAIL;
}

static int mmc_test_send_status(struct mmc_test_card *test,
                                struct mmc_command *cmd)
{
        memset(cmd, 0, sizeof(*cmd));

        cmd->opcode = MMC_SEND_STATUS;
        if (!mmc_host_is_spi(test->card->host))
                cmd->arg = test->card->rca << 16;
        cmd->flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;

        return mmc_wait_for_cmd(test->card->host, cmd, 0);
}

static int mmc_test_ongoing_transfer(struct mmc_test_card *test,
                                     unsigned int dev_addr, int use_sbc,
                                     int repeat_cmd, int write, int use_areq)
{
        struct mmc_test_req *rq = mmc_test_req_alloc();
        struct mmc_host *host = test->card->host;
        struct mmc_test_area *t = &test->area;
        struct mmc_request *mrq;
        unsigned long timeout;
        bool expired = false;
        int ret = 0, cmd_ret;
        u32 status = 0;
        int count = 0;

        if (!rq)
                return -ENOMEM;

        mrq = &rq->mrq;
        if (use_sbc)
                mrq->sbc = &rq->sbc;
        mrq->cap_cmd_during_tfr = true;

        mmc_test_prepare_mrq(test, mrq, t->sg, t->sg_len, dev_addr, t->blocks,
                             512, write);

        if (use_sbc && t->blocks > 1 && !mrq->sbc) {
                ret =  mmc_host_cmd23(host) ?
                       RESULT_UNSUP_CARD :
                       RESULT_UNSUP_HOST;
                goto out_free;
        }

        /* Start ongoing data request */
        if (use_areq) {
                ret = mmc_test_start_areq(test, mrq, NULL);
                if (ret)
                        goto out_free;
        } else {
                mmc_wait_for_req(host, mrq);
        }

        timeout = jiffies + msecs_to_jiffies(3000);
        do {
                count += 1;

                /* Send status command while data transfer in progress */
                cmd_ret = mmc_test_send_status(test, &rq->status);
                if (cmd_ret)
                        break;

                status = rq->status.resp[0];
                if (status & R1_ERROR) {
                        cmd_ret = -EIO;
                        break;
                }

                if (mmc_is_req_done(host, mrq))
                        break;

                expired = time_after(jiffies, timeout);
                if (expired) {
                        pr_info("%s: timeout waiting for Tran state status %#x\n",
                                mmc_hostname(host), status);
                        cmd_ret = -ETIMEDOUT;
                        break;
                }
        } while (repeat_cmd && R1_CURRENT_STATE(status) != R1_STATE_TRAN);

        /* Wait for data request to complete */
        if (use_areq) {
                ret = mmc_test_start_areq(test, NULL, mrq);
        } else {
                mmc_wait_for_req_done(test->card->host, mrq);
        }

        /*
         * For cap_cmd_during_tfr request, upper layer must send stop if
         * required.
         */
        if (mrq->data->stop && (mrq->data->error || !mrq->sbc)) {
                if (ret)
                        mmc_wait_for_cmd(host, mrq->data->stop, 0);
                else
                        ret = mmc_wait_for_cmd(host, mrq->data->stop, 0);
        }

        if (ret)
                goto out_free;

        if (cmd_ret) {
                pr_info("%s: Send Status failed: status %#x, error %d\n",
                        mmc_hostname(test->card->host), status, cmd_ret);
        }

        ret = mmc_test_check_result(test, mrq);
        if (ret)
                goto out_free;

        ret = mmc_test_wait_busy(test);
        if (ret)
                goto out_free;

        if (repeat_cmd && (t->blocks + 1) << 9 > t->max_tfr)
                pr_info("%s: %d commands completed during transfer of %u blocks\n",
                        mmc_hostname(test->card->host), count, t->blocks);

        if (cmd_ret)
                ret = cmd_ret;
out_free:
        kfree(rq);

        return ret;
}

static int __mmc_test_cmds_during_tfr(struct mmc_test_card *test,
                                      unsigned long sz, int use_sbc, int write,
                                      int use_areq)
{
        struct mmc_test_area *t = &test->area;
        int ret;

        if (!(test->card->host->caps & MMC_CAP_CMD_DURING_TFR))
                return RESULT_UNSUP_HOST;

        ret = mmc_test_area_map(test, sz, 0, 0, use_areq);
        if (ret)
                return ret;

        ret = mmc_test_ongoing_transfer(test, t->dev_addr, use_sbc, 0, write,
                                        use_areq);
        if (ret)
                return ret;

        return mmc_test_ongoing_transfer(test, t->dev_addr, use_sbc, 1, write,
                                         use_areq);
}

static int mmc_test_cmds_during_tfr(struct mmc_test_card *test, int use_sbc,
                                    int write, int use_areq)
{
        struct mmc_test_area *t = &test->area;
        unsigned long sz;
        int ret;

        for (sz = 512; sz <= t->max_tfr; sz += 512) {
                ret = __mmc_test_cmds_during_tfr(test, sz, use_sbc, write,
                                                 use_areq);
                if (ret)
                        return ret;
        }
        return 0;
}

/*
 * Commands during read - no Set Block Count (CMD23).
 */
static int mmc_test_cmds_during_read(struct mmc_test_card *test)
{
        return mmc_test_cmds_during_tfr(test, 0, 0, 0);
}

/*
 * Commands during write - no Set Block Count (CMD23).
 */
static int mmc_test_cmds_during_write(struct mmc_test_card *test)
{
        return mmc_test_cmds_during_tfr(test, 0, 1, 0);
}

/*
 * Commands during read - use Set Block Count (CMD23).
 */
static int mmc_test_cmds_during_read_cmd23(struct mmc_test_card *test)
{
        return mmc_test_cmds_during_tfr(test, 1, 0, 0);
}

/*
 * Commands during write - use Set Block Count (CMD23).
 */
static int mmc_test_cmds_during_write_cmd23(struct mmc_test_card *test)
{
        return mmc_test_cmds_during_tfr(test, 1, 1, 0);
}

/*
 * Commands during non-blocking read - use Set Block Count (CMD23).
 */
static int mmc_test_cmds_during_read_cmd23_nonblock(struct mmc_test_card *test)
{
        return mmc_test_cmds_during_tfr(test, 1, 0, 1);
}

/*
 * Commands during non-blocking write - use Set Block Count (CMD23).
 */
static int mmc_test_cmds_during_write_cmd23_nonblock(struct mmc_test_card *test)
{
        return mmc_test_cmds_during_tfr(test, 1, 1, 1);
}

static const struct mmc_test_case mmc_test_cases[] = {
        {
                .name = "Basic write (no data verification)",
                .run = mmc_test_basic_write,
        },

        {
                .name = "Basic read (no data verification)",
                .run = mmc_test_basic_read,
        },

        {
                .name = "Basic write (with data verification)",
                .prepare = mmc_test_prepare_write,
                .run = mmc_test_verify_write,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Basic read (with data verification)",
                .prepare = mmc_test_prepare_read,
                .run = mmc_test_verify_read,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Multi-block write",
                .prepare = mmc_test_prepare_write,
                .run = mmc_test_multi_write,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Multi-block read",
                .prepare = mmc_test_prepare_read,
                .run = mmc_test_multi_read,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Power of two block writes",
                .prepare = mmc_test_prepare_write,
                .run = mmc_test_pow2_write,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Power of two block reads",
                .prepare = mmc_test_prepare_read,
                .run = mmc_test_pow2_read,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Weird sized block writes",
                .prepare = mmc_test_prepare_write,
                .run = mmc_test_weird_write,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Weird sized block reads",
                .prepare = mmc_test_prepare_read,
                .run = mmc_test_weird_read,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Badly aligned write",
                .prepare = mmc_test_prepare_write,
                .run = mmc_test_align_write,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Badly aligned read",
                .prepare = mmc_test_prepare_read,
                .run = mmc_test_align_read,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Badly aligned multi-block write",
                .prepare = mmc_test_prepare_write,
                .run = mmc_test_align_multi_write,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Badly aligned multi-block read",
                .prepare = mmc_test_prepare_read,
                .run = mmc_test_align_multi_read,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Correct xfer_size at write (start failure)",
                .run = mmc_test_xfersize_write,
        },

        {
                .name = "Correct xfer_size at read (start failure)",
                .run = mmc_test_xfersize_read,
        },

        {
                .name = "Correct xfer_size at write (midway failure)",
                .run = mmc_test_multi_xfersize_write,
        },

        {
                .name = "Correct xfer_size at read (midway failure)",
                .run = mmc_test_multi_xfersize_read,
        },

#ifdef CONFIG_HIGHMEM

        {
                .name = "Highmem write",
                .prepare = mmc_test_prepare_write,
                .run = mmc_test_write_high,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Highmem read",
                .prepare = mmc_test_prepare_read,
                .run = mmc_test_read_high,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Multi-block highmem write",
                .prepare = mmc_test_prepare_write,
                .run = mmc_test_multi_write_high,
                .cleanup = mmc_test_cleanup,
        },

        {
                .name = "Multi-block highmem read",
                .prepare = mmc_test_prepare_read,
                .run = mmc_test_multi_read_high,
                .cleanup = mmc_test_cleanup,
        },

#else

        {
                .name = "Highmem write",
                .run = mmc_test_no_highmem,
        },

        {
                .name = "Highmem read",
                .run = mmc_test_no_highmem,
        },

        {
                .name = "Multi-block highmem write",
                .run = mmc_test_no_highmem,
        },

        {
                .name = "Multi-block highmem read",
                .run = mmc_test_no_highmem,
        },

#endif /* CONFIG_HIGHMEM */

        {
                .name = "Best-case read performance",
                .prepare = mmc_test_area_prepare_fill,
                .run = mmc_test_best_read_performance,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Best-case write performance",
                .prepare = mmc_test_area_prepare_erase,
                .run = mmc_test_best_write_performance,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Best-case read performance into scattered pages",
                .prepare = mmc_test_area_prepare_fill,
                .run = mmc_test_best_read_perf_max_scatter,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Best-case write performance from scattered pages",
                .prepare = mmc_test_area_prepare_erase,
                .run = mmc_test_best_write_perf_max_scatter,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Single read performance by transfer size",
                .prepare = mmc_test_area_prepare_fill,
                .run = mmc_test_profile_read_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Single write performance by transfer size",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_profile_write_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Single trim performance by transfer size",
                .prepare = mmc_test_area_prepare_fill,
                .run = mmc_test_profile_trim_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Consecutive read performance by transfer size",
                .prepare = mmc_test_area_prepare_fill,
                .run = mmc_test_profile_seq_read_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Consecutive write performance by transfer size",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_profile_seq_write_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Consecutive trim performance by transfer size",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_profile_seq_trim_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Random read performance by transfer size",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_random_read_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Random write performance by transfer size",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_random_write_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Large sequential read into scattered pages",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_large_seq_read_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Large sequential write from scattered pages",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_large_seq_write_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Write performance with blocking req 4k to 4MB",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_profile_mult_write_blocking_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Write performance with non-blocking req 4k to 4MB",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_profile_mult_write_nonblock_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Read performance with blocking req 4k to 4MB",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_profile_mult_read_blocking_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Read performance with non-blocking req 4k to 4MB",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_profile_mult_read_nonblock_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Write performance blocking req 1 to 512 sg elems",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_profile_sglen_wr_blocking_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Write performance non-blocking req 1 to 512 sg elems",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_profile_sglen_wr_nonblock_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Read performance blocking req 1 to 512 sg elems",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_profile_sglen_r_blocking_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Read performance non-blocking req 1 to 512 sg elems",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_profile_sglen_r_nonblock_perf,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Reset test",
                .run = mmc_test_reset,
        },

        {
                .name = "Commands during read - no Set Block Count (CMD23)",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_cmds_during_read,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Commands during write - no Set Block Count (CMD23)",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_cmds_during_write,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Commands during read - use Set Block Count (CMD23)",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_cmds_during_read_cmd23,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Commands during write - use Set Block Count (CMD23)",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_cmds_during_write_cmd23,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Commands during non-blocking read - use Set Block Count (CMD23)",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_cmds_during_read_cmd23_nonblock,
                .cleanup = mmc_test_area_cleanup,
        },

        {
                .name = "Commands during non-blocking write - use Set Block Count (CMD23)",
                .prepare = mmc_test_area_prepare,
                .run = mmc_test_cmds_during_write_cmd23_nonblock,
                .cleanup = mmc_test_area_cleanup,
        },
};

static DEFINE_MUTEX(mmc_test_lock);

static LIST_HEAD(mmc_test_result);

static void mmc_test_run(struct mmc_test_card *test, int testcase)
{
        int i, ret;

        pr_info("%s: Starting tests of card %s...\n",
                mmc_hostname(test->card->host), mmc_card_id(test->card));

        mmc_claim_host(test->card->host);

        for (i = 0; i < ARRAY_SIZE(mmc_test_cases); i++) {
                struct mmc_test_general_result *gr;

                if (testcase && ((i + 1) != testcase))
                        continue;

                pr_info("%s: Test case %d. %s...\n",
                        mmc_hostname(test->card->host), i + 1,
                        mmc_test_cases[i].name);

                if (mmc_test_cases[i].prepare) {
                        ret = mmc_test_cases[i].prepare(test);
                        if (ret) {
                                pr_info("%s: Result: Prepare stage failed! (%d)\n",
                                        mmc_hostname(test->card->host),
                                        ret);
                                continue;
                        }
                }

                gr = kzalloc(sizeof(*gr), GFP_KERNEL);
                if (gr) {
                        INIT_LIST_HEAD(&gr->tr_lst);

                        /* Assign data what we know already */
                        gr->card = test->card;
                        gr->testcase = i;

                        /* Append container to global one */
                        list_add_tail(&gr->link, &mmc_test_result);

                        /*
                         * Save the pointer to created container in our private
                         * structure.
                         */
                        test->gr = gr;
                }

                ret = mmc_test_cases[i].run(test);
                switch (ret) {
                case RESULT_OK:

                        pr_info("%s: Result: OK\n",
                                mmc_hostname(test->card->host));
                        break;
                case RESULT_FAIL:
                        pr_info("%s: Result: FAILED\n",
                                mmc_hostname(test->card->host));
                        break;
                case RESULT_UNSUP_HOST:
                        pr_info("%s: Result: UNSUPPORTED (by host)\n",
                                mmc_hostname(test->card->host));
                        break;
                case RESULT_UNSUP_CARD:
                        pr_info("%s: Result: UNSUPPORTED (by card)\n",
                                mmc_hostname(test->card->host));
                        break;
                default:
                        pr_info("%s: Result: ERROR (%d)\n",
                                mmc_hostname(test->card->host), ret);
                }

                /* Save the result */
                if (gr)
                        gr->result = ret;

                if (mmc_test_cases[i].cleanup) {
                        ret = mmc_test_cases[i].cleanup(test);
                        if (ret) {
                                pr_info("%s: Warning: Cleanup stage failed! (%d)\n",
                                        mmc_hostname(test->card->host),
                                        ret);
                        }
                }
        }

        mmc_release_host(test->card->host);

        pr_info("%s: Tests completed.\n",
                mmc_hostname(test->card->host));
}

static void mmc_test_free_result(struct mmc_card *card)
{
        struct mmc_test_general_result *gr, *grs;

        mutex_lock(&mmc_test_lock);

        list_for_each_entry_safe(gr, grs, &mmc_test_result, link) {
                struct mmc_test_transfer_result *tr, *trs;

                if (card && gr->card != card)
                        continue;

                list_for_each_entry_safe(tr, trs, &gr->tr_lst, link) {
                        list_del(&tr->link);
                        kfree(tr);
                }

                list_del(&gr->link);
                kfree(gr);
        }

        mutex_unlock(&mmc_test_lock);
}

static LIST_HEAD(mmc_test_file_test);

static int mtf_test_show(struct seq_file *sf, void *data)
{
        struct mmc_card *card = (struct mmc_card *)sf->private;
        struct mmc_test_general_result *gr;

        mutex_lock(&mmc_test_lock);

        list_for_each_entry(gr, &mmc_test_result, link) {
                struct mmc_test_transfer_result *tr;

                if (gr->card != card)
                        continue;

                seq_printf(sf, "Test %d: %d\n", gr->testcase + 1, gr->result);

                list_for_each_entry(tr, &gr->tr_lst, link) {
                        seq_printf(sf, "%u %d %llu.%09u %u %u.%02u\n",
                                tr->count, tr->sectors,
                                (u64)tr->ts.tv_sec, (u32)tr->ts.tv_nsec,
                                tr->rate, tr->iops / 100, tr->iops % 100);
                }
        }

        mutex_unlock(&mmc_test_lock);

        return 0;
}

static int mtf_test_open(struct inode *inode, struct file *file)
{
        return single_open(file, mtf_test_show, inode->i_private);
}

static ssize_t mtf_test_write(struct file *file, const char __user *buf,
        size_t count, loff_t *pos)
{
        struct seq_file *sf = (struct seq_file *)file->private_data;
        struct mmc_card *card = (struct mmc_card *)sf->private;
        struct mmc_test_card *test;
        long testcase;
        int ret;

        ret = kstrtol_from_user(buf, count, 10, &testcase);
        if (ret)
                return ret;

        test = kzalloc(sizeof(*test), GFP_KERNEL);
        if (!test)
                return -ENOMEM;

        /*
         * Remove all test cases associated with given card. Thus we have only
         * actual data of the last run.
         */
        mmc_test_free_result(card);

        test->card = card;

        test->buffer = kzalloc(BUFFER_SIZE, GFP_KERNEL);
#ifdef CONFIG_HIGHMEM
        test->highmem = alloc_pages(GFP_KERNEL | __GFP_HIGHMEM, BUFFER_ORDER);
#endif

#ifdef CONFIG_HIGHMEM
        if (test->buffer && test->highmem) {
#else
        if (test->buffer) {
#endif
                mutex_lock(&mmc_test_lock);
                mmc_test_run(test, testcase);
                mutex_unlock(&mmc_test_lock);
        }

#ifdef CONFIG_HIGHMEM
        __free_pages(test->highmem, BUFFER_ORDER);
#endif
        kfree(test->buffer);
        kfree(test);

        return count;
}

static const struct file_operations mmc_test_fops_test = {
        .open           = mtf_test_open,
        .read           = seq_read,
        .write          = mtf_test_write,
        .llseek         = seq_lseek,
        .release        = single_release,
};

static int mtf_testlist_show(struct seq_file *sf, void *data)
{
        int i;

        mutex_lock(&mmc_test_lock);

        seq_puts(sf, "0:\tRun all tests\n");
        for (i = 0; i < ARRAY_SIZE(mmc_test_cases); i++)
                seq_printf(sf, "%d:\t%s\n", i + 1, mmc_test_cases[i].name);

        mutex_unlock(&mmc_test_lock);

        return 0;
}

DEFINE_SHOW_ATTRIBUTE(mtf_testlist);

static void mmc_test_free_dbgfs_file(struct mmc_card *card)
{
        struct mmc_test_dbgfs_file *df, *dfs;

        mutex_lock(&mmc_test_lock);

        list_for_each_entry_safe(df, dfs, &mmc_test_file_test, link) {
                if (card && df->card != card)
                        continue;
                debugfs_remove(df->file);
                list_del(&df->link);
                kfree(df);
        }

        mutex_unlock(&mmc_test_lock);
}

static int __mmc_test_register_dbgfs_file(struct mmc_card *card,
        const char *name, umode_t mode, const struct file_operations *fops)
{
        struct dentry *file = NULL;
        struct mmc_test_dbgfs_file *df;

        if (card->debugfs_root)
                debugfs_create_file(name, mode, card->debugfs_root, card, fops);

        df = kmalloc(sizeof(*df), GFP_KERNEL);
        if (!df) {
                debugfs_remove(file);
                return -ENOMEM;
        }

        df->card = card;
        df->file = file;

        list_add(&df->link, &mmc_test_file_test);
        return 0;
}

static int mmc_test_register_dbgfs_file(struct mmc_card *card)
{
        int ret;

        mutex_lock(&mmc_test_lock);

        ret = __mmc_test_register_dbgfs_file(card, "test", S_IWUSR | S_IRUGO,
                &mmc_test_fops_test);
        if (ret)
                goto err;

        ret = __mmc_test_register_dbgfs_file(card, "testlist", S_IRUGO,
                &mtf_testlist_fops);
        if (ret)
                goto err;

err:
        mutex_unlock(&mmc_test_lock);

        return ret;
}

static int mmc_test_probe(struct mmc_card *card)
{
        int ret;

        if (!mmc_card_mmc(card) && !mmc_card_sd(card))
                return -ENODEV;

        ret = mmc_test_register_dbgfs_file(card);
        if (ret)
                return ret;

        if (card->ext_csd.cmdq_en) {
                mmc_claim_host(card->host);
                ret = mmc_cmdq_disable(card);
                mmc_release_host(card->host);
                if (ret)
                        return ret;
        }

        dev_info(&card->dev, "Card claimed for testing.\n");

        return 0;
}

static void mmc_test_remove(struct mmc_card *card)
{
        if (card->reenable_cmdq) {
                mmc_claim_host(card->host);
                mmc_cmdq_enable(card);
                mmc_release_host(card->host);
        }
        mmc_test_free_result(card);
        mmc_test_free_dbgfs_file(card);
}

static void mmc_test_shutdown(struct mmc_card *card)
{
}

static struct mmc_driver mmc_driver = {
        .drv            = {
                .name   = "mmc_test",
        },
        .probe          = mmc_test_probe,
        .remove         = mmc_test_remove,
        .shutdown       = mmc_test_shutdown,
};

static int __init mmc_test_init(void)
{
        return mmc_register_driver(&mmc_driver);
}

static void __exit mmc_test_exit(void)
{
        /* Clear stalled data if card is still plugged */
        mmc_test_free_result(NULL);
        mmc_test_free_dbgfs_file(NULL);

        mmc_unregister_driver(&mmc_driver);
}

module_init(mmc_test_init);
module_exit(mmc_test_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Multimedia Card (MMC) host test driver");
MODULE_AUTHOR("Pierre Ossman");