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Commit 5bf42096 authored by Sayali Lokhande's avatar Sayali Lokhande Committed by Xiaonian Wang
Browse files

mmc: host: Add Ring buffer logging for MMC. 



Add ring buffer to enable tracing of significant events
of eMMC in both CQ and Legacy mode for debug purpose.

CONFIG_MMC_RING_BUFFER should be enabled to use ring
buffer logging.

Change-Id: Iceb404d77fca19e133c319bc66ec15b2d77c7c54
Signed-off-by: default avatarSayali Lokhande <sayalil@codeaurora.org>
[xiaonian@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: default avatarXiaonian Wang <xiaonian@codeaurora.org>
parent 13805b3b

drivers/mmc/core/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -23,6 +23,17 @@ config PWRSEQ_SIMPLE 
	  This driver can also be built as a module. If so, the module

	  will be called pwrseq_simple.



config MMC_RING_BUFFER

	bool "MMC_RING_BUFFER"

	depends on MMC

	default n

	help

	  This enables the ring buffer tracing of significant

	  events for mmc driver to provide command history for

	  debugging purpose.



	  If unsure, say N.



config MMC_EMBEDDED_SDIO

	boolean "MMC embedded SDIO device support (EXPERIMENTAL)"

	help

drivers/mmc/core/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -12,3 +12,4 @@ mmc_core-$(CONFIG_OF) += pwrseq.o 
obj-$(CONFIG_PWRSEQ_SIMPLE)	+= pwrseq_simple.o

obj-$(CONFIG_PWRSEQ_EMMC)	+= pwrseq_emmc.o

mmc_core-$(CONFIG_DEBUG_FS)	+= debugfs.o

obj-$(CONFIG_MMC_RING_BUFFER)	+= ring_buffer.o

drivers/mmc/core/host.c

+3 −0
Original line number Diff line number Diff line
@@ -25,6 +25,8 @@ 


#include <linux/mmc/host.h>

#include <linux/mmc/card.h>

#include <linux/mmc/ring_buffer.h>



#include <linux/mmc/slot-gpio.h>



#include "core.h"
@@ -904,6 +906,7 @@ int mmc_add_host(struct mmc_host *host) 
	mmc_add_host_debugfs(host);

#endif

	mmc_host_clk_sysfs_init(host);

	mmc_trace_init(host);



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

	if (err)

include/linux/mmc/host.h

+2 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/mmc/card.h>

#include <linux/mmc/mmc.h>

#include <linux/mmc/pm.h>

#include <linux/mmc/ring_buffer.h>



#define MMC_AUTOSUSPEND_DELAY_MS	3000
@@ -603,6 +604,7 @@ struct mmc_host { 
	} perf;

	bool perf_enable;

#endif

	struct mmc_trace_buffer trace_buf;

	enum dev_state dev_status;

	bool			wakeup_on_idle;

	struct mmc_cmdq_context_info	cmdq_ctx;

include/linux/mmc/ring_buffer.h

0 → 100644
+55 −0
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2017, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */



#ifndef __MMC_RING_BUFFER__

#define __MMC_RING_BUFFER__



#include <linux/mmc/card.h>

#include <linux/smp.h>



#include "core.h"



#define MMC_TRACE_RBUF_SZ_ORDER	2	/* 2^2 pages */

#define MMC_TRACE_RBUF_SZ	(PAGE_SIZE * (1 << MMC_TRACE_RBUF_SZ_ORDER))

#define MMC_TRACE_EVENT_SZ	256

#define MMC_TRACE_RBUF_NUM_EVENTS	(MMC_TRACE_RBUF_SZ / MMC_TRACE_EVENT_SZ)



struct mmc_host;

struct mmc_trace_buffer {

	int	wr_idx;

	bool stop_tracing;

	spinlock_t trace_lock;

	char *data;

};



#ifdef CONFIG_MMC_RING_BUFFER

void mmc_stop_tracing(struct mmc_host *mmc);

void mmc_trace_write(struct mmc_host *mmc, const char *fmt, ...);

void mmc_trace_init(struct mmc_host *mmc);

void mmc_trace_free(struct mmc_host *mmc);

void mmc_dump_trace_buffer(struct mmc_host *mmc, struct seq_file *s);

#else

static inline void mmc_stop_tracing(struct mmc_host *mmc) {}

static inline void mmc_trace_write(struct mmc_host *mmc,

		const char *fmt, ...) {}

static inline void mmc_trace_init(struct mmc_host *mmc) {}

static inline void mmc_trace_free(struct mmc_host *mmc) {}

static inline void mmc_dump_trace_buffer(struct mmc_host *mmc,

		struct seq_file *s) {}

#endif



#define MMC_TRACE(mmc, fmt, ...) \

		mmc_trace_write(mmc, fmt, ##__VA_ARGS__)



#endif /* __MMC_RING_BUFFER__ */