99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/*
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* Copyright (c) 2019 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/logging/log_backend.h>
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#include <zephyr/logging/log_core.h>
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#include <zephyr/logging/log_output.h>
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#include <zephyr/logging/log_backend_std.h>
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/*
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* A lock is needed as log_process() and log_panic() have no internal locks
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* to prevent concurrency. Meaning if log_process is called after
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* log_panic was called previously, log_process may happen from another
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* CPU and calling context than the log processing thread running in
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* the background. On an SMP system this is a race.
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*
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* This caused a race on the output trace such that the logging output
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* was garbled and useless.
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*/
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static struct k_spinlock lock;
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static uint32_t log_format_current = CONFIG_LOG_BACKEND_ADSP_OUTPUT_DEFAULT;
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void intel_adsp_trace_out(int8_t *str, size_t len);
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static int char_out(uint8_t *data, size_t length, void *ctx)
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{
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intel_adsp_trace_out(data, length);
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return length;
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}
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/**
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* 80 bytes seems to catch most sensibly sized log message lines
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* in one go letting the trace out call output whole complete
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* lines. This avoids the overhead of a spin lock in the trace_out
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* more often as well as avoiding entwined characters from printk if
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* LOG_PRINTK=n.
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*/
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#define LOG_BUF_SIZE 80
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static uint8_t log_buf[LOG_BUF_SIZE];
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LOG_OUTPUT_DEFINE(log_output_adsp, char_out, log_buf, sizeof(log_buf));
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static uint32_t format_flags(void)
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{
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uint32_t flags = LOG_OUTPUT_FLAG_LEVEL | LOG_OUTPUT_FLAG_TIMESTAMP;
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if (IS_ENABLED(CONFIG_LOG_BACKEND_FORMAT_TIMESTAMP)) {
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flags |= LOG_OUTPUT_FLAG_FORMAT_TIMESTAMP;
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}
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return flags;
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}
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static void panic(struct log_backend const *const backend)
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{
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k_spinlock_key_t key = k_spin_lock(&lock);
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log_backend_std_panic(&log_output_adsp);
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k_spin_unlock(&lock, key);
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}
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static inline void dropped(const struct log_backend *const backend,
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uint32_t cnt)
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{
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log_output_dropped_process(&log_output_adsp, cnt);
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}
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static void process(const struct log_backend *const backend,
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union log_msg_generic *msg)
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{
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log_format_func_t log_output_func = log_format_func_t_get(log_format_current);
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k_spinlock_key_t key = k_spin_lock(&lock);
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log_output_func(&log_output_adsp, &msg->log, format_flags());
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k_spin_unlock(&lock, key);
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}
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static int format_set(const struct log_backend *const backend, uint32_t log_type)
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{
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log_format_current = log_type;
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return 0;
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}
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const struct log_backend_api log_backend_adsp_api = {
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.process = process,
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.dropped = IS_ENABLED(CONFIG_LOG_MODE_IMMEDIATE) ? NULL : dropped,
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.panic = panic,
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.format_set = format_set,
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};
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LOG_BACKEND_DEFINE(log_backend_adsp, log_backend_adsp_api, true);
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