text: /*
   *  linux/drivers/mmc/card/mmc_test.c
   *
   *  Copyright 2007-2008 Pierre Ossman
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or (at
   * your option) any later version.
   */
  
  #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>
  
  #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
   */
  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 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 timespec 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;
  };
  
  struct mmc_test_async_req {
  	struct mmc_async_req areq;
  	struct mmc_test_card *test;
  };
  
  /*******************************************************************/
  /*  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);
  }
  
  /*
   * 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)
  {
  	BUG_ON(!mrq || !mrq->cmd || !mrq->data || !mrq->stop);
  
  	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_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 = {0};
  
  	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 = {0};
  	struct mmc_command cmd = {0};
  	struct mmc_command stop = {0};
  	struct mmc_data data = {0};
  
  	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(struct mmc_test_mem), GFP_KERNEL);
  	if (!mem)
  		return NULL;
  
  	mem->arr = kzalloc(sizeof(struct mmc_test_pages) * max_segs,
  			   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 timespec *ts)
  {
  	uint64_t ns;
  
  	ns = ts->tv_sec;
  	ns *= 1000000000;
  	ns += ts->tv_nsec;
  
  	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 timespec ts,
  	unsigned int rate, unsigned int iops)
  {
  	struct mmc_test_transfer_result *tr;
  
  	if (!test->gr)
  		return;
  
  	tr = kmalloc(sizeof(struct mmc_test_transfer_result), 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 timespec *ts1, struct timespec *ts2)
  {
  	unsigned int rate, iops, sectors = bytes >> 9;
  	struct timespec ts;
  
  	ts = timespec_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 %lu.%09lu "
  			 "seconds (%u kB/s, %u KiB/s, %u.%02u IOPS)\n",
  			 mmc_hostname(test->card->host), sectors, sectors >> 1,
  			 (sectors & 1 ? ".5" : ""), (unsigned long)ts.tv_sec,
  			 (unsigned long)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 timespec *ts1,
  				    struct timespec *ts2)
  {
  	unsigned int rate, iops, sectors = bytes >> 9;
  	uint64_t tot = bytes * count;
  	struct timespec ts;
  
  	ts = timespec_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 "
  			 "%lu.%09lu 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" : ""),
  			 (unsigned long)ts.tv_sec, (unsigned long)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)
  {
  	BUG_ON(!mrq || !mrq->cmd || !mrq->data);
  
  	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;
  
  	BUG_ON(!mrq || !mrq->cmd || !mrq->data);
  
  	ret = 0;
  
  	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;
  }
  
  static int mmc_test_check_result_async(struct mmc_card *card,
  				       struct mmc_async_req *areq)
  {
  	struct mmc_test_async_req *test_async =
  		container_of(areq, struct mmc_test_async_req, areq);
  
  	mmc_test_wait_busy(test_async->test);
  
  	return mmc_test_check_result(test_async->test, areq->mrq);
  }
  
  /*
   * 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;
  
  	BUG_ON(!mrq || !mrq->cmd || !mrq->data);
  
  	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;
  }
  
  /*
   * Tests nonblock transfer with certain parameters
   */
  static void mmc_test_nonblock_reset(struct mmc_request *mrq,
  				    struct mmc_command *cmd,
  				    struct mmc_command *stop,
  				    struct mmc_data *data)
  {
  	memset(mrq, 0, sizeof(struct mmc_request));
  	memset(cmd, 0, sizeof(struct mmc_command));
  	memset(data, 0, sizeof(struct mmc_data));
  	memset(stop, 0, sizeof(struct mmc_command));
  
  	mrq->cmd = cmd;
  	mrq->data = data;
  	mrq->stop = stop;
  }
  static int mmc_test_nonblock_transfer(struct mmc_test_card *test,
  				      struct scatterlist *sg, unsigned sg_len,
  				      unsigned dev_addr, unsigned blocks,
  				      unsigned blksz, int write, int count)
  {
  	struct mmc_request mrq1;
  	struct mmc_command cmd1;
  	struct mmc_command stop1;
  	struct mmc_data data1;
  
  	struct mmc_request mrq2;
  	struct mmc_command cmd2;
  	struct mmc_command stop2;
  	struct mmc_data data2;
  
  	struct mmc_test_async_req test_areq[2];
  	struct mmc_async_req *done_areq;
  	struct mmc_async_req *cur_areq = &test_areq[0].areq;
  	struct mmc_async_req *other_areq = &test_areq[1].areq;
  	int i;
  	int ret;
  
  	test_areq[0].test = test;
  	test_areq[1].test = test;
  
  	mmc_test_nonblock_reset(&mrq1, &cmd1, &stop1, &data1);
  	mmc_test_nonblock_reset(&mrq2, &cmd2, &stop2, &data2);
  
  	cur_areq->mrq = &mrq1;
  	cur_areq->err_check = mmc_test_check_result_async;
  	other_areq->mrq = &mrq2;
  	other_areq->err_check = mmc_test_check_result_async;
  
  	for (i = 0; i < count; i++) {
  		mmc_test_prepare_mrq(test, cur_areq->mrq, sg, sg_len, dev_addr,
  				     blocks, blksz, write);
  		done_areq = mmc_start_req(test->card->host, cur_areq, &ret);
  
  		if (ret || (!done_areq && i > 0))
  			goto err;
  
  		if (done_areq) {
  			if (done_areq->mrq == &mrq2)
  				mmc_test_nonblock_reset(&mrq2, &cmd2,
  							&stop2, &data2);
  			else
  				mmc_test_nonblock_reset(&mrq1, &cmd1,
  							&stop1, &data1);
  		}
  		swap(cur_areq, other_areq);
  		dev_addr += blocks;
  	}
  
  	done_areq = mmc_start_req(test->card->host, NULL, &ret);
  
  	return ret;
  err:
  	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 = {0};
  	struct mmc_command cmd = {0};
  	struct mmc_command stop = {0};
  	struct mmc_data data = {0};
  
  	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 = {0};
  	struct mmc_command cmd = {0};
  	struct mmc_command stop = {0};
  	struct mmc_data data = {0};
  
  	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)
  {
  	struct mmc_test_area *t = &test->area;
  	int err;
  
  	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)
  		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 timespec ts1, ts2;
  	int ret = 0;
  	int i;
  	struct mmc_test_area *t = &test->area;
  
  	/*
  	 * 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);
  	if (ret)
  		return ret;
  
  	if (timed)
  		getnstimeofday(&ts1);
  	if (nonblock)
  		ret = mmc_test_nonblock_transfer(test, t->sg, t->sg_len,
  				 dev_addr, t->blocks, 512, 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)
  		getnstimeofday(&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);
  	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 charateristics 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(sizeof(struct scatterlist) * t->max_segs, GFP_KERNEL);
  	if (!t->sg) {
  		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 timespec 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);
  		getnstimeofday(&ts1);
  		ret = mmc_erase(test->card, dev_addr, sz >> 9, MMC_TRIM_ARG);
  		if (ret)
  			return ret;
  		getnstimeofday(&ts2);
  		mmc_test_print_rate(test, sz, &ts1, &ts2);
  	}
  	dev_addr = t->dev_addr;
  	getnstimeofday(&ts1);
  	ret = mmc_erase(test->card, dev_addr, sz >> 9, MMC_TRIM_ARG);
  	if (ret)
  		return ret;
  	getnstimeofday(&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 timespec ts1, ts2;
  	int ret;
  
  	cnt = t->max_sz / sz;
  	dev_addr = t->dev_addr;
  	getnstimeofday(&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);
  	}
  	getnstimeofday(&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 timespec ts1, ts2;
  	int ret;
  
  	ret = mmc_test_area_erase(test);
  	if (ret)
  		return ret;
  	cnt = t->max_sz / sz;
  	dev_addr = t->dev_addr;
  	getnstimeofday(&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);
  	}
  	getnstimeofday(&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 timespec 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;
  		getnstimeofday(&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);
  		}
  		getnstimeofday(&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 timespec 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;
  
  	getnstimeofday(&ts1);
  	for (cnt = 0; cnt < UINT_MAX; cnt++) {
  		getnstimeofday(&ts2);
  		ts = timespec_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 timespec 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 */
  
  	getnstimeofday(&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;
  	}
  	getnstimeofday(&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_hw_reset(struct mmc_test_card *test)
  {
  	struct mmc_card *card = test->card;
  	struct mmc_host *host = card->host;
  	int err;
  
  	if (!mmc_card_mmc(card) || !mmc_can_reset(card))
  		return RESULT_UNSUP_CARD;
  
  	err = mmc_hw_reset(host);
  	if (!err)
  		return RESULT_OK;
  	else if (err == -EOPNOTSUPP)
  		return RESULT_UNSUP_HOST;
  
  	return RESULT_FAIL;
  }
  
  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 = "eMMC hardware reset",
  		.run = mmc_test_hw_reset,
  	},
  };
  
  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(struct mmc_test_general_result),
  			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 %lu.%09lu %u %u.%02u\n",
  				tr->count, tr->sectors,
  				(unsigned long)tr->ts.tv_sec,
  				(unsigned long)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(struct mmc_test_card), 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);
  
  	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;
  }
  
  static int mtf_testlist_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, mtf_testlist_show, inode->i_private);
  }
  
  static const struct file_operations mmc_test_fops_testlist = {
  	.open		= mtf_testlist_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };
  
  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)
  		file = debugfs_create_file(name, mode, card->debugfs_root,
  			card, fops);
  
  	if (IS_ERR_OR_NULL(file)) {
  		dev_err(&card->dev,
  			"Can't create %s. Perhaps debugfs is disabled.\n",
  			name);
  		return -ENODEV;
  	}
  
  	df = kmalloc(sizeof(struct mmc_test_dbgfs_file), GFP_KERNEL);
  	if (!df) {
  		debugfs_remove(file);
  		dev_err(&card->dev,
  			"Can't allocate memory for internal usage.\n");
  		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,
  		&mmc_test_fops_testlist);
  	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;
  
  	dev_info(&card->dev, "Card claimed for testing.\n");
  
  	return 0;
  }
  
  static void mmc_test_remove(struct mmc_card *card)
  {
  	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");
  