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mmc_test: collect data and show it via sysfs by demand

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Make it possible to get test results via sysfs.  It helps to do tests
non-interactively.  We have the file created under sysfs already and
can use it to show test results.

Prior to this patch, the "test" file under each card's sysfs node was
write-only, and results were obtained by looking at dmesg.  This patch
improves programmatic access to the test results, making them available by
reading back from the same "test" file:

[root@host mmc0:e624]# echo 6 > test
[root@host mmc0:e624]# cat test
Test 6: 2

[cjb@laptop.org: changelog improvements]
Signed-off-by: Andy Shevchenko <ext-andriy.shevchenko@nokia.com>
Cc: Chris Ball <cjb@laptop.org>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Andy Shevchenko 2010-09-01 09:26:47 +03:00 committed by Chris Ball
parent 5c25aee536
commit 3183aa1534
1 changed files with 169 additions and 2 deletions
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171
drivers/mmc/card/mmc_test.c
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@ -17,6 +17,7 @@
#include <linux/scatterlist.h>
#include <linux/swap.h> /* For nr_free_buffer_pages() */
#include <linux/list.h>
#define RESULT_OK 0
#define RESULT_FAIL 1
@ -76,6 +77,38 @@ struct mmc_test_area {
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
*/
struct mmc_test_transfer_result {
struct list_head link;
unsigned int count;
unsigned int sectors;
struct timespec ts;
unsigned int rate;
};
/**
* 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_card - test information.
* @card: card under test
@ -83,6 +116,7 @@ struct mmc_test_area {
* @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;
@ -92,7 +126,8 @@ struct mmc_test_card {
#ifdef CONFIG_HIGHMEM
struct page *highmem;
#endif
struct mmc_test_area area;
struct mmc_test_area area;
struct mmc_test_general_result *gr;
};
/*******************************************************************/
@ -448,6 +483,30 @@ static unsigned int mmc_test_rate(uint64_t bytes, struct timespec *ts)
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)
{
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;
list_add_tail(&tr->link, &test->gr->tr_lst);
}
/*
* Print the transfer rate.
*/
@ -466,6 +525,8 @@ static void mmc_test_print_rate(struct mmc_test_card *test, uint64_t bytes,
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);
mmc_test_save_transfer_result(test, 1, sectors, ts, rate);
}
/*
@ -489,6 +550,8 @@ static void mmc_test_print_avg_rate(struct mmc_test_card *test, uint64_t bytes,
sectors >> 1, (sectors == 1 ? ".5" : ""),
(unsigned long)ts.tv_sec, (unsigned long)ts.tv_nsec,
rate / 1000, rate / 1024);
mmc_test_save_transfer_result(test, count, sectors, ts, rate);
}
/*
@ -1940,6 +2003,8 @@ static const struct mmc_test_case mmc_test_cases[] = {
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;
@ -1950,6 +2015,8 @@ static void mmc_test_run(struct mmc_test_card *test, int testcase)
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;
@ -1968,6 +2035,25 @@ static void mmc_test_run(struct mmc_test_card *test, int testcase)
}
}
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:
@ -1993,6 +2079,10 @@ static void mmc_test_run(struct mmc_test_card *test, int testcase)
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) {
@ -2010,13 +2100,80 @@ static void mmc_test_run(struct mmc_test_card *test, int testcase)
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 ssize_t mmc_test_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mmc_card *card = mmc_dev_to_card(dev);
struct mmc_test_general_result *gr;
char *p = buf;
size_t len = PAGE_SIZE;
int ret;
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;
ret = snprintf(p, len, "Test %d: %d\n", gr->testcase + 1,
gr->result);
if (ret < 0)
goto err;
if (ret >= len) {
ret = -ENOBUFS;
goto err;
}
p += ret;
len -= ret;
list_for_each_entry(tr, &gr->tr_lst, link) {
ret = snprintf(p, len, "%u %d %lu.%09lu %u\n",
tr->count, tr->sectors,
(unsigned long)tr->ts.tv_sec,
(unsigned long)tr->ts.tv_nsec,
tr->rate);
if (ret < 0)
goto err;
if (ret >= len) {
ret = -ENOBUFS;
goto err;
}
p += ret;
len -= ret;
}
}
ret = PAGE_SIZE - len;
err:
mutex_unlock(&mmc_test_lock);
return 0;
return ret;
}
static ssize_t mmc_test_store(struct device *dev,
@ -2033,6 +2190,12 @@ static ssize_t mmc_test_store(struct device *dev,
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);
@ -2079,6 +2242,7 @@ static int mmc_test_probe(struct mmc_card *card)
static void mmc_test_remove(struct mmc_card *card)
{
mmc_test_free_result(card);
device_remove_file(&card->dev, &dev_attr_test);
}
@ -2097,6 +2261,9 @@ static int __init mmc_test_init(void)
static void __exit mmc_test_exit(void)
{
/* Clear stalled data if card is still plugged */
mmc_test_free_result(NULL);
mmc_unregister_driver(&mmc_driver);
}