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nrf_modem_lib_trace.c
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nrf_modem_lib_trace.c
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/*
* Copyright (c) 2021 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
*/
#include <stdbool.h>
#include <sys/types.h>
#include <zephyr/kernel.h>
#include <zephyr/logging/log.h>
#include <modem/nrf_modem_lib.h>
#include <modem/nrf_modem_lib_trace.h>
#include <modem/trace_backend.h>
#include <nrf_modem.h>
#include <nrf_modem_at.h>
#include <nrf_modem_os.h>
#include <nrf_modem_trace.h>
#include <nrf_errno.h>
LOG_MODULE_REGISTER(nrf_modem_lib_trace, CONFIG_NRF_MODEM_LIB_LOG_LEVEL);
K_SEM_DEFINE(trace_sem, 0, 1);
K_SEM_DEFINE(trace_clear_sem, 0, 1);
K_SEM_DEFINE(trace_done_sem, 1, 1);
extern struct nrf_modem_lib_trace_backend trace_backend;
static bool has_space = true;
#define TRACE_THREAD_PRIORITY \
COND_CODE_1(CONFIG_NRF_MODEM_LIB_TRACE_THREAD_PRIO_OVERRIDE, \
(CONFIG_NRF_MODEM_LIB_TRACE_THREAD_PRIO), (K_LOWEST_APPLICATION_THREAD_PRIO))
static int trace_init(void);
static int trace_deinit(void);
static bool backend_suspended;
static void backend_suspend_handle(struct k_work *item);
K_WORK_DELAYABLE_DEFINE(backend_suspend_work, backend_suspend_handle);
#define BACKEND_SUSPEND_DELAY K_MSEC(CONFIG_NRF_MODEM_LIB_TRACE_BACKEND_SUSPEND_DELAY_MS)
static void backend_suspend(void)
{
int err;
if (backend_suspended || !trace_backend.suspend) {
return;
}
err = trace_backend.suspend();
if (err) {
LOG_ERR("Could not suspend trace backend");
}
backend_suspended = true;
}
static void backend_resume(void)
{
int err;
if (!backend_suspended || !trace_backend.resume) {
return;
}
err = trace_backend.resume();
if (err) {
LOG_ERR("Could not resume trace backend");
}
backend_suspended = false;
}
static void backend_suspend_handle(struct k_work *item)
{
backend_suspend();
}
#if CONFIG_NRF_MODEM_LIB_TRACE_BACKEND_BITRATE
static uint32_t backend_bps_avg;
static uint32_t backend_bps_tot;
static uint32_t backend_bps_samples;
static int64_t backend_measurement_start;
#define BACKEND_BPS_AVG_UPDATE_PERIOD K_MSEC(CONFIG_NRF_MODEM_LIB_TRACE_BACKEND_BITRATE_PERIOD_MS)
static void backend_bps_reset(void)
{
backend_bps_tot = 0;
backend_bps_samples = 0;
}
static void backend_bps_update(int bps)
{
backend_bps_tot += bps;
backend_bps_samples++;
}
static void backend_bps_avg_update(struct k_work *item);
K_WORK_DELAYABLE_DEFINE(backend_bps_avg_update_work, backend_bps_avg_update);
static void backend_bps_avg_update(struct k_work *item)
{
if (backend_bps_samples != 0) {
backend_bps_avg = backend_bps_tot / backend_bps_samples;
} else {
/* With 0 samples the average is 0 */
backend_bps_avg = 0;
}
backend_bps_reset();
k_work_schedule(&backend_bps_avg_update_work, BACKEND_BPS_AVG_UPDATE_PERIOD);
}
uint32_t nrf_modem_lib_trace_backend_bitrate_get(void)
{
return backend_bps_avg;
}
static void trace_backend_bitrate_perf_start(void)
{
backend_measurement_start = k_uptime_ticks();
}
static void trace_backend_bitrate_perf_end(int size)
{
int64_t delta;
uint32_t bps;
delta = k_uptime_ticks() - backend_measurement_start;
if (size > 0 && delta > 0) {
bps = size * 8 * CONFIG_SYS_CLOCK_TICKS_PER_SEC / delta;
backend_bps_update(bps);
}
}
#define PERF_START trace_backend_bitrate_perf_start
#define PERF_END(size) trace_backend_bitrate_perf_end(size)
#else
#define PERF_START(...)
#define PERF_END(...)
#endif
__weak void nrf_modem_lib_trace_callback(enum nrf_modem_lib_trace_event evt)
{
LOG_ERR("%s was called with event %d but no callback is set", __func__, evt);
}
#if CONFIG_NRF_MODEM_LIB_TRACE_BACKEND_BITRATE_LOG
#define BACKEND_BPS_LOG_PERIOD K_MSEC(CONFIG_NRF_MODEM_LIB_TRACE_BACKEND_BITRATE_LOG_PERIOD_MS)
static void backend_bps_log(struct k_work *item);
K_WORK_DELAYABLE_DEFINE(backend_bps_log_work, backend_bps_log);
static void backend_bps_log(struct k_work *item)
{
LOG_INF("Trace backend bitrate (bps): %u", backend_bps_avg);
k_work_schedule(&backend_bps_log_work, BACKEND_BPS_LOG_PERIOD);
}
#endif
#if CONFIG_NRF_MODEM_LIB_TRACE_BITRATE_LOG
#define BPS_LOG_PERIOD_MS CONFIG_NRF_MODEM_LIB_TRACE_BITRATE_LOG_PERIOD_MS
#define BPS_LOG_PERIOD K_MSEC(BPS_LOG_PERIOD_MS)
static size_t trace_bytes_received;
static size_t trace_bytes_received_total;
static size_t trace_bytes_read_total;
static void update_trace_bytes_received(struct nrf_modem_trace_data *frags, size_t n_frags)
{
for (size_t i = 0; i < n_frags; i++) {
trace_bytes_received += frags[i].len;
trace_bytes_received_total += frags[i].len;
}
}
static void update_trace_bytes_read(size_t bytes)
{
trace_bytes_read_total += bytes;
}
static void bps_log(struct k_work *item);
K_WORK_DELAYABLE_DEFINE(bps_log_work, bps_log);
static void bps_log(struct k_work *item)
{
uint32_t data_bits = trace_bytes_received * 8;
uint32_t trace_data_bps_avg = data_bits * 1000 / BPS_LOG_PERIOD_MS;
trace_bytes_received = 0;
LOG_INF("Written: %d, read: %d", trace_bytes_received_total, trace_bytes_read_total);
LOG_INF("Trace bitrate (bps): %u", trace_data_bps_avg);
k_work_schedule(&bps_log_work, BPS_LOG_PERIOD);
}
#define UPDATE_TRACE_BYTES_RECEIVED(frags, n_frags) update_trace_bytes_received(frags, n_frags)
#define UPDATE_TRACE_BYTES_READ(bytes) update_trace_bytes_read(bytes)
#else
#define UPDATE_TRACE_BYTES_RECEIVED(...)
#define UPDATE_TRACE_BYTES_READ(...)
#endif
int nrf_modem_lib_trace_processing_done_wait(k_timeout_t timeout)
{
int err;
if (!has_space) {
return -ENOSPC;
}
err = k_sem_take(&trace_done_sem, timeout);
if (err) {
return err;
}
k_sem_give(&trace_done_sem);
if (!has_space) {
return -ENOSPC;
}
return 0;
}
static int trace_fragment_write(struct nrf_modem_trace_data *frag)
{
int ret;
size_t remaining = frag->len;
while (remaining) {
PERF_START();
ret = trace_backend.write((void *)((uint8_t *)frag->data + frag->len - remaining),
remaining);
PERF_END(ret);
__ASSERT(ret != 0, "Trace backend wrote 0 bytes");
/* We handle this here and not in the trace_thread_handler as we might not write the
* entire trace fragment in the same write operation. If we get EAGAIN on the
* second, third, ..., we would repeat sending the first section of the trace
* fragment.
*/
if (ret == -EAGAIN) {
/* We don't allow retrying if the modem is shut down as that can block
* a new modem init.
*/
if (!nrf_modem_is_initialized()) {
return -ESHUTDOWN;
}
continue;
}
if (ret < 0) {
LOG_ERR("trace_backend.write failed with err: %d", ret);
return ret;
}
remaining -= ret;
}
return 0;
}
void trace_thread_handler(void)
{
int err;
struct nrf_modem_trace_data *frags;
size_t n_frags;
trace_reset:
k_sem_take(&trace_sem, K_FOREVER);
while (true) {
if (trace_backend.suspend) {
k_work_schedule(&backend_suspend_work, BACKEND_SUSPEND_DELAY);
}
err = nrf_modem_trace_get(&frags, &n_frags, NRF_MODEM_OS_FOREVER);
if (trace_backend.suspend) {
k_work_cancel_delayable(&backend_suspend_work);
}
switch (err) {
case 0:
/* Success */
UPDATE_TRACE_BYTES_RECEIVED(frags, n_frags);
break;
case -NRF_ESHUTDOWN:
LOG_INF("Modem was turned off, no more traces");
goto deinit;
case -NRF_ENODATA:
LOG_INF("No more trace data");
goto deinit;
case -NRF_EINPROGRESS:
__ASSERT(0, "Error in transport backend");
goto deinit;
default:
__ASSERT(0, "Unhandled err %d", err);
goto deinit;
}
if (backend_suspended) {
backend_resume();
}
for (int i = 0; i < n_frags; i++) {
err = trace_fragment_write(&frags[i]);
switch (err) {
case 0:
break;
case -ENOSPC:
nrf_modem_lib_trace_callback(NRF_MODEM_LIB_TRACE_EVT_FULL);
if (!trace_backend.clear) {
goto deinit;
}
has_space = false;
k_sem_give(&trace_done_sem);
k_sem_take(&trace_clear_sem, K_FOREVER);
/* Try the same fragment again */
i--;
continue;
default:
/* Irrecoverable error */
goto deinit;
}
}
}
deinit:
err = trace_deinit();
if (err) {
LOG_ERR("trace_deinit failed with err: %d", err);
}
goto trace_reset;
}
static int trace_init(void)
{
int err;
if (!trace_backend.init || !trace_backend.deinit || !trace_backend.write) {
LOG_ERR("trace backend must implement init, deinit and write");
return -ENOTSUP;
}
k_sem_take(&trace_done_sem, K_FOREVER);
err = trace_backend.init(nrf_modem_trace_processed);
if (err) {
LOG_ERR("trace_backend: init failed with err: %d", err);
return err;
}
LOG_INF("Trace thread ready");
k_sem_give(&trace_sem);
#if CONFIG_NRF_MODEM_LIB_TRACE_BACKEND_BITRATE
k_work_schedule(&backend_bps_avg_update_work, BACKEND_BPS_AVG_UPDATE_PERIOD);
#endif
#if CONFIG_NRF_MODEM_LIB_TRACE_BACKEND_BITRATE_LOG
k_work_schedule(&backend_bps_log_work, BACKEND_BPS_LOG_PERIOD);
#endif
#if CONFIG_NRF_MODEM_LIB_TRACE_BITRATE_LOG
k_work_schedule(&bps_log_work, BPS_LOG_PERIOD);
#endif
return 0;
}
void nrf_modem_lib_trace_init(void)
{
int err;
err = trace_init();
if (err) {
LOG_ERR("Failed to initialize trace backend, err: %d", err);
return;
}
#if CONFIG_NRF_MODEM_LIB_TRACE_LEVEL_OVERRIDE
err = nrf_modem_lib_trace_level_set(CONFIG_NRF_MODEM_LIB_TRACE_LEVEL);
LOG_INF("Trace level override: %d", CONFIG_NRF_MODEM_LIB_TRACE_LEVEL);
if (err) {
LOG_ERR("Failed to start tracing, err %d", err);
}
#else
LOG_INF("Trace level untouched");
#endif
}
static int trace_deinit(void)
{
int err;
err = trace_backend.deinit();
if (err) {
LOG_ERR("trace_backend: deinit failed with err: %d", err);
return err;
}
#if CONFIG_NRF_MODEM_LIB_TRACE_BACKEND_BITRATE
k_work_cancel_delayable(&backend_bps_avg_update_work);
#endif
#if CONFIG_NRF_MODEM_LIB_TRACE_BACKEND_BITRATE_LOG
k_work_cancel_delayable(&backend_bps_log_work);
#endif
#if CONFIG_NRF_MODEM_LIB_TRACE_BITRATE_LOG
k_work_cancel_delayable(&bps_log_work);
#endif
k_sem_give(&trace_done_sem);
return 0;
}
int nrf_modem_lib_trace_level_set(enum nrf_modem_lib_trace_level trace_level)
{
int err;
/* Casting to integer to remove any assumptions on the type of the enum
* (could be `char` or `int`) when `printf` expects exactly `int`.
*/
int tl = trace_level;
if (tl) {
err = nrf_modem_at_printf("AT%%XMODEMTRACE=1,%d", tl);
} else {
err = nrf_modem_at_printf("AT%%XMODEMTRACE=0");
}
if (err) {
LOG_ERR("Failed to set trace level, err: %d", err);
return -ENOEXEC;
}
return 0;
}
size_t nrf_modem_lib_trace_data_size(void)
{
if (!trace_backend.data_size) {
return -ENOTSUP;
}
return trace_backend.data_size();
}
int nrf_modem_lib_trace_read(uint8_t *buf, size_t len)
{
int read;
if (!trace_backend.read) {
return -ENOTSUP;
}
read = trace_backend.read(buf, len);
if (read > 0) {
UPDATE_TRACE_BYTES_READ(read);
}
return read;
}
int nrf_modem_lib_trace_clear(void)
{
int err;
if (!trace_backend.clear) {
return -ENOTSUP;
}
err = trace_backend.clear();
if (err) {
return err;
}
if (!has_space) {
k_sem_take(&trace_done_sem, K_FOREVER);
has_space = true;
k_sem_give(&trace_clear_sem);
}
return 0;
}
K_THREAD_DEFINE(trace_thread, CONFIG_NRF_MODEM_LIB_TRACE_STACK_SIZE, trace_thread_handler,
NULL, NULL, NULL, TRACE_THREAD_PRIORITY, 0, 0);