b88a7af704
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>
55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/*
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* Copyright (c) 2017, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef __MMC_RING_BUFFER__
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#define __MMC_RING_BUFFER__
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#include <linux/mmc/card.h>
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#include <linux/smp.h>
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#include "core.h"
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#define MMC_TRACE_RBUF_SZ_ORDER 2 /* 2^2 pages */
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#define MMC_TRACE_RBUF_SZ (PAGE_SIZE * (1 << MMC_TRACE_RBUF_SZ_ORDER))
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#define MMC_TRACE_EVENT_SZ 256
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#define MMC_TRACE_RBUF_NUM_EVENTS (MMC_TRACE_RBUF_SZ / MMC_TRACE_EVENT_SZ)
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struct mmc_host;
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struct mmc_trace_buffer {
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int wr_idx;
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bool stop_tracing;
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spinlock_t trace_lock;
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char *data;
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};
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#ifdef CONFIG_MMC_RING_BUFFER
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void mmc_stop_tracing(struct mmc_host *mmc);
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void mmc_trace_write(struct mmc_host *mmc, const char *fmt, ...);
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void mmc_trace_init(struct mmc_host *mmc);
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void mmc_trace_free(struct mmc_host *mmc);
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void mmc_dump_trace_buffer(struct mmc_host *mmc, struct seq_file *s);
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#else
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static inline void mmc_stop_tracing(struct mmc_host *mmc) {}
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static inline void mmc_trace_write(struct mmc_host *mmc,
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const char *fmt, ...) {}
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static inline void mmc_trace_init(struct mmc_host *mmc) {}
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static inline void mmc_trace_free(struct mmc_host *mmc) {}
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static inline void mmc_dump_trace_buffer(struct mmc_host *mmc,
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struct seq_file *s) {}
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#endif
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#define MMC_TRACE(mmc, fmt, ...) \
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mmc_trace_write(mmc, fmt, ##__VA_ARGS__)
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#endif /* __MMC_RING_BUFFER__ */
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