Message-ID: <97D3A72708D04647A5AC84A04996E5B5125FB8@039-SN1MPN1-006.039d.mgd.msft.net>
Date:	Sun, 17 Apr 2011 07:09:34 +0000
From:	Lin Tony-B19295 <B19295@...escale.com>
To:	Per Forlin <per.forlin@...aro.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>
CC:	Chris Ball <cjb@...top.org>
Subject: RE: [PATCH v2 03/12] mmc: mmc_test: add test for none blocking
 transfers

Hi Per

	Just have a glance of your patch, good thinking. But I have a question about this patch. You modified mmc_test to test your driver. Does it mean your driver's performance enhancement depends on application? The caller must have to know the next request so that could make driver prepare next during current transfer? So testing your driver with blocking request & non blocking request will have different throughput due to different application mechanism. 
	Thanks

BR
Tony

-----Original Message-----
From: linux-arm-kernel-bounces@...ts.infradead.org [mailto:linux-arm-kernel-bounces@...ts.infradead.org] On Behalf Of Per Forlin
Sent: Thursday, April 07, 2011 3:07 AM
To: linux-mmc@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; linaro-dev@...ts.linaro.org
Cc: Chris Ball; Per Forlin
Subject: [PATCH v2 03/12] mmc: mmc_test: add test for none blocking transfers

Add four tests for read and write performance per different transfer size, 4k to 4M.
 * Read using blocking mmc request
 * Read using none blocking mmc request
 * Write using blocking mmc request
 * Write using none blocking mmc request

The host dirver must support pre_req() and post_req() in order to run the none blocking test cases.

Signed-off-by: Per Forlin <per.forlin@...aro.org>
---
 drivers/mmc/card/mmc_test.c |  312 +++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 304 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/card/mmc_test.c b/drivers/mmc/card/mmc_test.c index 466cdb5..1000383 100644
--- a/drivers/mmc/card/mmc_test.c
+++ b/drivers/mmc/card/mmc_test.c
@@ -22,6 +22,7 @@
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/seq_file.h>
+#include <linux/random.h>
 
 #define RESULT_OK		0
 #define RESULT_FAIL		1
@@ -51,10 +52,12 @@ struct mmc_test_pages {
  * struct mmc_test_mem - allocated memory.
  * @arr: array of allocations
  * @cnt: number of allocations
+ * @size_min_cmn: lowest common size in array of allocations
  */
 struct mmc_test_mem {
 	struct mmc_test_pages *arr;
 	unsigned int cnt;
+	unsigned int size_min_cmn;
 };
 
 /**
@@ -148,6 +151,21 @@ struct mmc_test_card {
 	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 *bs;
+	unsigned int len;
+	unsigned int size;
+	bool do_write;
+	bool do_nonblock_req;
+	enum mmc_test_prep_media prepare;
+};
+
 /*******************************************************************/
 /*  General helper functions                                       */
 /*******************************************************************/
@@ -307,6 +325,7 @@ static struct mmc_test_mem *mmc_test_alloc_mem(unsigned long min_sz,
 	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;
+	unsigned int min_cmn = 0;
 	struct mmc_test_mem *mem;
 
 	if (max_page_cnt > limit)
@@ -350,6 +369,12 @@ static struct mmc_test_mem *mmc_test_alloc_mem(unsigned long min_sz,
 		mem->arr[mem->cnt].page = page;
 		mem->arr[mem->cnt].order = order;
 		mem->cnt += 1;
+		if (!min_cmn)
+			min_cmn = PAGE_SIZE << order;
+		else
+			min_cmn = min(min_cmn,
+				      (unsigned int) (PAGE_SIZE << order));
+
 		if (max_page_cnt <= (1UL << order))
 			break;
 		max_page_cnt -= 1UL << order;
@@ -360,6 +385,7 @@ static struct mmc_test_mem *mmc_test_alloc_mem(unsigned long min_sz,
 			break;
 		}
 	}
+	mem->size_min_cmn = min_cmn;
 
 	return mem;
 
@@ -386,7 +412,6 @@ static int mmc_test_map_sg(struct mmc_test_mem *mem, unsigned long sz,
 	do {
 		for (i = 0; i < mem->cnt; i++) {
 			unsigned long len = PAGE_SIZE << mem->arr[i].order;
-
 			if (len > sz)
 				len = sz;
 			if (len > max_seg_sz)
@@ -725,6 +750,94 @@ static int mmc_test_check_broken_result(struct mmc_test_card *test,  }
 
 /*
+ * 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_request *cur_mrq;
+	struct mmc_request *prev_mrq;
+	int i;
+	int ret = 0;
+
+	if (!test->card->host->ops->pre_req ||
+		!test->card->host->ops->post_req)
+		return -RESULT_UNSUP_HOST;
+
+	mmc_test_nonblock_reset(&mrq1, &cmd1, &stop1, &data1);
+	mmc_test_nonblock_reset(&mrq2, &cmd2, &stop2, &data2);
+
+	cur_mrq = &mrq1;
+	prev_mrq = NULL;
+
+	for (i = 0; i < count; i++) {
+		mmc_test_prepare_mrq(test, cur_mrq, sg, sg_len, dev_addr,
+				blocks, blksz, write);
+		mmc_pre_req(test->card->host, cur_mrq, !prev_mrq);
+
+		if (prev_mrq) {
+			mmc_wait_for_req_done(prev_mrq);
+			mmc_test_wait_busy(test);
+			ret = mmc_test_check_result(test, prev_mrq);
+			if (ret)
+				goto err;
+		}
+
+		mmc_start_req(test->card->host, cur_mrq);
+
+		if (prev_mrq)
+			mmc_post_req(test->card->host, prev_mrq, 0);
+
+		prev_mrq = cur_mrq;
+		if (cur_mrq == &mrq1) {
+			mmc_test_nonblock_reset(&mrq2, &cmd2, &stop2, &data2);
+			cur_mrq = &mrq2;
+		} else {
+			mmc_test_nonblock_reset(&mrq1, &cmd1, &stop1, &data1);
+			cur_mrq = &mrq1;
+		}
+		dev_addr += blocks;
+	}
+
+	mmc_wait_for_req_done(prev_mrq);
+	mmc_test_wait_busy(test);
+	ret = mmc_test_check_result(test, prev_mrq);
+	if (ret)
+		goto err;
+	mmc_post_req(test->card->host, prev_mrq, 0);
+
+	return ret;
+err:
+	return ret;
+}
+
+/*
  * Tests a basic transfer with certain parameters
  */
 static int mmc_test_simple_transfer(struct mmc_test_card *test, @@ -1351,14 +1464,17 @@ static int mmc_test_area_transfer(struct mmc_test_card *test,  }
 
 /*
- * Map and transfer bytes.
+ * Map and transfer bytes for multiple transfers.
  */
-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)
+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)
 {
 	struct timespec ts1, ts2;
-	int ret;
+	int ret = 0;
+	int i;
+	struct mmc_test_area *t = &test->area;
 
 	/*
 	 * In the case of a maximally scattered transfer, the maximum transfer @@ -1382,8 +1498,15 @@ static int mmc_test_area_io(struct mmc_test_card *test, unsigned long sz,
 
 	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;
+		}
 
-	ret = mmc_test_area_transfer(test, dev_addr, write);
 	if (ret)
 		return ret;
 
@@ -1391,11 +1514,19 @@ static int mmc_test_area_io(struct mmc_test_card *test, unsigned long sz,
 		getnstimeofday(&ts2);
 
 	if (timed)
-		mmc_test_print_rate(test, sz, &ts1, &ts2);
+		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);
+}
+
 /*
  * Write the test area entirely.
  */
@@ -1956,6 +2087,144 @@ 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) {
+	unsigned int dev_addr;
+	struct mmc_test_area *t = &test->area;
+	int ret = 0;
+	int max_reqsize = max(t->mem->size_min_cmn *
+			      min(t->max_segs, t->mem->cnt), t->max_tfr);
+
+	/* Set up test area */
+	if (size > mmc_test_capacity(test->card) / 2 * 512)
+		size = mmc_test_capacity(test->card) / 2 * 512;
+	if (reqsize > max_reqsize)
+		reqsize = max_reqsize;
+	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;
+
+	/* 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);
+	if (ret)
+		goto err;
+
+	return ret;
+ err:
+	printk(KERN_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;
+
+	for (i = 0 ; i < rw->len && ret == 0; i++) {
+		ret = mmc_test_rw_multiple(test, rw, rw->bs[i], rw->size);
+		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 = 128*1024*1024,
+		.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 none 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 = 128*1024*1024,
+		.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 = 128*1024*1024,
+		.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 none 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 = 128*1024*1024,
+		.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); }
+
 static const struct mmc_test_case mmc_test_cases[] = {
 	{
 		.name = "Basic write (no data verification)", @@ -2223,6 +2492,33 @@ static const struct mmc_test_case mmc_test_cases[] = {
 		.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 none 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 none blocking req 4k to 4MB",
+		.prepare = mmc_test_area_prepare,
+		.run = mmc_test_profile_mult_read_nonblock_perf,
+		.cleanup = mmc_test_area_cleanup,
+	},
 };
 
 static DEFINE_MUTEX(mmc_test_lock);
--
1.7.4.1


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