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Commit 2485460c authored by Sayali Lokhande's avatar Sayali Lokhande
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mmc: core: Add sysfs entry to print ring buffer 



Add sysfs entry to print MMC ring buffer events.
usage: cat /sys/kernel/debug/mmc0/ring_buffer

Change-Id: I1fb6b0f65a11cd574e56df9937a96acd74a84341
Signed-off-by: default avatarSayali Lokhande <sayalil@codeaurora.org>
parent 67ca95e6

drivers/mmc/core/debugfs.c

+26 −0
Original line number Diff line number Diff line
@@ -32,6 +32,26 @@ module_param(fail_request, charp, 0); 
#endif /* CONFIG_FAIL_MMC_REQUEST */



/* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */

static int mmc_ring_buffer_show(struct seq_file *s, void *data)

{

	struct mmc_host *mmc = s->private;



	mmc_dump_trace_buffer(mmc, s);

	return 0;

}



static int mmc_ring_buffer_open(struct inode *inode, struct file *file)

{

	return single_open(file, mmc_ring_buffer_show, inode->i_private);

}



static const struct file_operations mmc_ring_buffer_fops = {

	.open		= mmc_ring_buffer_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



static int mmc_ios_show(struct seq_file *s, void *data)

{

	static const char *vdd_str[] = {
@@ -374,6 +394,12 @@ void mmc_add_host_debugfs(struct mmc_host *host) 
		&mmc_err_state))

		goto err_node;



#ifdef CONFIG_MMC_RING_BUFFER

	if (!debugfs_create_file("ring_buffer", S_IRUSR,

				root, host, &mmc_ring_buffer_fops))

		goto err_node;

#endif



#ifdef CONFIG_MMC_CLKGATE

	if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),

				root, &host->clk_delay))