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mmc_test: move files from sysfs to debugfs

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As proposed by Greg K-H it is more logical to keep files for the mmc_test
driver under debugfs.

Additionally this patch brings seq_file API for show() method.  It allows
to write unlimited data to the file.

Example of usage:
  # mount -t debugfs none /sys/kernel/debug
  # modprobe mmc_test
    [  581.395843] mmc_test mmc0:0001: Card claimed for testing.
  # echo 25 > /sys/kernel/debug/mmc0/mmc0\:0001/test
    [  604.568542] mmc0: Starting tests of card mmc0:0001...
    [  604.582733] mmc0: Test case 25. Best-case read performance into scattered pages...
    [  604.923553] mmc0: Transfer of 8192 sectors (4096 KiB) took 0.124664314 seconds (33644 kB/s, 32856 KiB/s)
    [  604.933227] mmc0: Result: OK
    [  604.936248] mmc0: Tests completed.
  # cat /sys/kernel/debug/mmc0/mmc0\:0001/test
    Test 25: 0
    1 8192 0.124664314 33644784

Signed-off-by: Andy Shevchenko <ext-andriy.shevchenko@nokia.com>
Cc: Greg KH <greg@kroah.com>
Cc: Adrian Hunter <adrian.hunter@nokia.com>
Cc: Chris Ball <cjb@laptop.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 2010-09-10 10:10:50 +03:00 committed by Chris Ball
parent 3183aa1534
commit 130067ed15
1 changed files with 107 additions and 35 deletions
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142
drivers/mmc/card/mmc_test.c
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@ -19,6 +19,10 @@
#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>
#define RESULT_OK 0
#define RESULT_FAIL 1
#define RESULT_UNSUP_HOST 2
@ -109,6 +113,18 @@ struct mmc_test_general_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
@ -2124,14 +2140,12 @@ static void mmc_test_free_result(struct mmc_card *card)
mutex_unlock(&mmc_test_lock);
}
static ssize_t mmc_test_show(struct device *dev,
struct device_attribute *attr, char *buf)
static LIST_HEAD(mmc_test_file_test);
static int mtf_test_show(struct seq_file *sf, void *data)
{
struct mmc_card *card = mmc_dev_to_card(dev);
struct mmc_card *card = (struct mmc_card *)sf->private;
struct mmc_test_general_result *gr;
char *p = buf;
size_t len = PAGE_SIZE;
int ret;
mutex_lock(&mmc_test_lock);
@ -2141,49 +2155,44 @@ static ssize_t mmc_test_show(struct device *dev,
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;
seq_printf(sf, "Test %d: %d\n", gr->testcase + 1, gr->result);
list_for_each_entry(tr, &gr->tr_lst, link) {
ret = snprintf(p, len, "%u %d %lu.%09lu %u\n",
seq_printf(sf, "%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 ret;
return 0;
}
static ssize_t mmc_test_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
static int mtf_test_open(struct inode *inode, struct file *file)
{
struct mmc_card *card = mmc_dev_to_card(dev);
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;
char lbuf[12];
long testcase;
if (strict_strtol(buf, 10, &testcase))
if (count >= sizeof(lbuf))
return -EINVAL;
if (copy_from_user(lbuf, buf, count))
return -EFAULT;
lbuf[count] = '\0';
if (strict_strtol(lbuf, 10, &testcase))
return -EINVAL;
test = kzalloc(sizeof(struct mmc_test_card), GFP_KERNEL);
@ -2222,7 +2231,69 @@ static ssize_t mmc_test_store(struct device *dev,
return count;
}
static DEVICE_ATTR(test, S_IWUSR | S_IRUGO, mmc_test_show, mmc_test_store);
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 void mmc_test_free_file_test(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_file_test(struct mmc_card *card)
{
struct dentry *file = NULL;
struct mmc_test_dbgfs_file *df;
int ret = 0;
mutex_lock(&mmc_test_lock);
if (card->debugfs_root)
file = debugfs_create_file("test", S_IWUSR | S_IRUGO,
card->debugfs_root, card, &mmc_test_fops_test);
if (IS_ERR_OR_NULL(file)) {
dev_err(&card->dev,
"Can't create file. Perhaps debugfs is disabled.\n");
ret = -ENODEV;
goto err;
}
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");
ret = -ENOMEM;
goto err;
}
df->card = card;
df->file = file;
list_add(&df->link, &mmc_test_file_test);
err:
mutex_unlock(&mmc_test_lock);
return ret;
}
static int mmc_test_probe(struct mmc_card *card)
{
@ -2231,7 +2302,7 @@ static int mmc_test_probe(struct mmc_card *card)
if (!mmc_card_mmc(card) && !mmc_card_sd(card))
return -ENODEV;
ret = device_create_file(&card->dev, &dev_attr_test);
ret = mmc_test_register_file_test(card);
if (ret)
return ret;
@ -2243,7 +2314,7 @@ 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);
mmc_test_free_file_test(card);
}
static struct mmc_driver mmc_driver = {
@ -2263,6 +2334,7 @@ static void __exit mmc_test_exit(void)
{
/* Clear stalled data if card is still plugged */
mmc_test_free_result(NULL);
mmc_test_free_file_test(NULL);
mmc_unregister_driver(&mmc_driver);
}