1 /*
2 * Copyright (c) 2019 Intel Corporation
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <zephyr/logging/log_backend.h>
8 #include <zephyr/logging/log_core.h>
9 #include <zephyr/logging/log_output.h>
10 #include <zephyr/logging/log_backend_std.h>
11
12 /*
13 * A lock is needed as log_process() and log_panic() have no internal locks
14 * to prevent concurrency. Meaning if log_process is called after
15 * log_panic was called previously, log_process may happen from another
16 * CPU and calling context than the log processing thread running in
17 * the background. On an SMP system this is a race.
18 *
19 * This caused a race on the output trace such that the logging output
20 * was garbled and useless.
21 */
22 static struct k_spinlock lock;
23
24 static uint32_t log_format_current = CONFIG_LOG_BACKEND_ADSP_OUTPUT_DEFAULT;
25 void winstream_console_trace_out(int8_t *str, size_t len);
26
char_out(uint8_t * data,size_t length,void * ctx)27 static int char_out(uint8_t *data, size_t length, void *ctx)
28 {
29 winstream_console_trace_out(data, length);
30
31 return length;
32 }
33
34
35 /**
36 * 80 bytes seems to catch most sensibly sized log message lines
37 * in one go letting the trace out call output whole complete
38 * lines. This avoids the overhead of a spin lock in the trace_out
39 * more often as well as avoiding entwined characters from printk if
40 * LOG_PRINTK=n.
41 */
42 #define LOG_BUF_SIZE 80
43 static uint8_t log_buf[LOG_BUF_SIZE];
44
45 LOG_OUTPUT_DEFINE(log_output_adsp, char_out, log_buf, sizeof(log_buf));
46
format_flags(void)47 static uint32_t format_flags(void)
48 {
49 uint32_t flags = LOG_OUTPUT_FLAG_LEVEL | LOG_OUTPUT_FLAG_TIMESTAMP;
50
51 if (IS_ENABLED(CONFIG_LOG_BACKEND_FORMAT_TIMESTAMP)) {
52 flags |= LOG_OUTPUT_FLAG_FORMAT_TIMESTAMP;
53 }
54
55 return flags;
56 }
57
panic(struct log_backend const * const backend)58 static void panic(struct log_backend const *const backend)
59 {
60 k_spinlock_key_t key = k_spin_lock(&lock);
61
62 log_backend_std_panic(&log_output_adsp);
63
64 k_spin_unlock(&lock, key);
65 }
66
dropped(const struct log_backend * const backend,uint32_t cnt)67 static inline void dropped(const struct log_backend *const backend,
68 uint32_t cnt)
69 {
70 log_output_dropped_process(&log_output_adsp, cnt);
71 }
72
process(const struct log_backend * const backend,union log_msg_generic * msg)73 static void process(const struct log_backend *const backend,
74 union log_msg_generic *msg)
75 {
76 log_format_func_t log_output_func = log_format_func_t_get(log_format_current);
77
78 k_spinlock_key_t key = k_spin_lock(&lock);
79
80 log_output_func(&log_output_adsp, &msg->log, format_flags());
81
82 k_spin_unlock(&lock, key);
83 }
84
format_set(const struct log_backend * const backend,uint32_t log_type)85 static int format_set(const struct log_backend *const backend, uint32_t log_type)
86 {
87 log_format_current = log_type;
88 return 0;
89 }
90
91 const struct log_backend_api log_backend_adsp_api = {
92 .process = process,
93 .dropped = IS_ENABLED(CONFIG_LOG_MODE_IMMEDIATE) ? NULL : dropped,
94 .panic = panic,
95 .format_set = format_set,
96 };
97
98 LOG_BACKEND_DEFINE(log_backend_adsp, log_backend_adsp_api, true);
99
