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Commit 38fc8df2 authored by Sayali Lokhande's avatar Sayali Lokhande
Browse files

mmc: core: Add IPC logging for mmc 



This change adds ipc logging context for eMMC and
sd card to trace significant events for debug purpose.

Logged events can be viewed at:
/sys/kernel/debug/ipc_logging/mmcX/log .

Change-Id: I40af30520c6009949d6bef742dd839aba5442e95
Signed-off-by: default avatarSayali Lokhande <sayalil@codeaurora.org>
parent af96f07f

drivers/mmc/core/host.c

+12 −0
Original line number Diff line number Diff line
@@ -597,6 +597,13 @@ int mmc_add_host(struct mmc_host *host) 
	mmc_add_host_debugfs(host);

#endif



#ifdef CONFIG_MMC_IPC_LOGGING

	host->ipc_log_ctxt = ipc_log_context_create(NUM_LOG_PAGES,

					dev_name(&host->class_dev), 0);

	if (!host->ipc_log_ctxt)

		pr_err("%s: Error getting ipc_log_ctxt\n", __func__);

#endif



	err = sysfs_create_group(&host->class_dev.kobj, &clk_scaling_attr_grp);

	if (err)

		pr_err("%s: failed to create clk scale sysfs group with err %d\n",
@@ -628,6 +635,11 @@ void mmc_remove_host(struct mmc_host *host) 
#ifdef CONFIG_DEBUG_FS

	mmc_remove_host_debugfs(host);

#endif



#ifdef CONFIG_MMC_IPC_LOGGING

	ipc_log_context_destroy(host->ipc_log_ctxt);

	host->ipc_log_ctxt = NULL;

#endif

	sysfs_remove_group(&host->class_dev.kobj, &clk_scaling_attr_grp);



	device_del(&host->class_dev);

include/linux/mmc/host.h

+17 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/fault-inject.h>

#include <linux/blkdev.h>

#include <linux/extcon.h>

#include <linux/ipc_logging.h>



#include <linux/mmc/core.h>

#include <linux/mmc/card.h>
@@ -618,6 +619,11 @@ struct mmc_host { 
	} perf;

	bool perf_enable;

#endif



#ifdef CONFIG_MMC_IPC_LOGGING

	void *ipc_log_ctxt;

	bool stop_tracing;

#endif

	enum dev_state dev_status;

	bool inlinecrypt_support;  /* Inline encryption support */

	bool crash_on_err;	/* crash the system on error */
@@ -635,6 +641,17 @@ void mmc_free_host(struct mmc_host *); 
int mmc_of_parse(struct mmc_host *host);

int mmc_of_parse_voltage(struct device_node *np, u32 *mask);



#ifdef CONFIG_MMC_IPC_LOGGING

#define NUM_LOG_PAGES	10

#define mmc_log_string(mmc_host, fmt, ...)	do {	\

	if ((mmc_host)->ipc_log_ctxt && !(mmc_host)->stop_tracing)	\

		ipc_log_string((mmc_host)->ipc_log_ctxt,	\

			"%s: " fmt, __func__, ##__VA_ARGS__);	\

	} while (0)

#else

#define mmc_log_string(mmc_host, fmt, ...)	do { } while (0)

#endif



static inline void *mmc_priv(struct mmc_host *host)

{

	return (void *)host->private;