mmc_test: collect data and show it via sysfs by demand
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>
diff --git a/drivers/mmc/card/mmc_test.c b/drivers/mmc/card/mmc_test.c
index 2888fdc..0c8b568 100644
--- a/drivers/mmc/card/mmc_test.c
+++ b/drivers/mmc/card/mmc_test.c
@@ -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
@@ -77,12 +78,45 @@
};
/**
+ * 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
* @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;
@@ -92,7 +126,8 @@
#ifdef CONFIG_HIGHMEM
struct page *highmem;
#endif
- struct mmc_test_area area;
+ struct mmc_test_area area;
+ struct mmc_test_general_result *gr;
};
/*******************************************************************/
@@ -449,6 +484,30 @@
}
/*
+ * 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.
*/
static void mmc_test_print_rate(struct mmc_test_card *test, uint64_t bytes,
@@ -466,6 +525,8 @@
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 @@
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 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 @@
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 @@
}
}
+ 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 @@
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 @@
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 @@
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 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 void __exit mmc_test_exit(void)
{
+ /* Clear stalled data if card is still plugged */
+ mmc_test_free_result(NULL);
+
mmc_unregister_driver(&mmc_driver);
}