diff options
| author | Sayali Lokhande <sayalil@codeaurora.org> | 2016-11-24 18:08:26 +0530 |
|---|---|---|
| committer | Sayali Lokhande <sayalil@codeaurora.org> | 2017-01-11 09:30:55 +0530 |
| commit | b88a7af704cad5ab5f2973cc92c1056ceb155d6e (patch) | |
| tree | 0f7da075b53ba86670fcc051fbe2336a9faeb52b /include/linux | |
| parent | 0a8e939a4e57d86da88c9856cd266447fc45ea85 (diff) | |
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: Sayali Lokhande <sayalil@codeaurora.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mmc/host.h | 2 | ||||
| -rw-r--r-- | include/linux/mmc/ring_buffer.h | 55 |
2 files changed, 57 insertions, 0 deletions
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 276dbf19805b..804d89a825fc 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -22,6 +22,7 @@ #include <linux/mmc/core.h> #include <linux/mmc/card.h> #include <linux/mmc/pm.h> +#include <linux/mmc/ring_buffer.h> #define MMC_AUTOSUSPEND_DELAY_MS 3000 @@ -571,6 +572,7 @@ 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; diff --git a/include/linux/mmc/ring_buffer.h b/include/linux/mmc/ring_buffer.h new file mode 100644 index 000000000000..e6bf163ffcfe --- /dev/null +++ b/include/linux/mmc/ring_buffer.h @@ -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__ */ |