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mmc: host: Add Ring buffer logging for MMC.

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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: Sayali Lokhande <sayalil@codeaurora.org>
[xiaonian@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: Xiaonian Wang <xiaonian@codeaurora.org>
This commit is contained in:
Sayali Lokhande
2016-11-24 18:08:26 +05:30
committed by Xiaonian Wang
parent 13805b3bf7
commit 5bf4209686
5 changed files with 72 additions and 0 deletions
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11
drivers/mmc/core/Kconfig
View File

@@ -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

1
drivers/mmc/core/Makefile
View File

@@ -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

3
drivers/mmc/core/host.c
View File

@@ -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)

2
include/linux/mmc/host.h
View File

@@ -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;

55
include/linux/mmc/ring_buffer.h Normal file
View File

@@ -0,0 +1,55 @@
/*
* 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__ */