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ANDROID: vendor_hooks: Add vendor hook for tcpm logs

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Logs in /sys/kernel/debug/usb/tcpm* are key to debug issues related to
USB charging or data. Given that debugfs is disabled in user builds,
adding vendor hooks to enable dumping the same.

bypass_log is set to true by the handler if logging into logbuffer is
not needed.

Bug: 189792358
Change-Id: Icacfed2264b6c49b8e803c62f8bd820a146c169a
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
This commit is contained in:
Badhri Jagan Sridharan 2021-05-31 15:19:54 -07:00
commit bcfe28b62f
3 changed files with 9 additions and 0 deletions
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1
drivers/android/vendor_hooks.c
View file

@ -299,3 +299,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_show_stack_hash);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_save_track_hash);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_set_task_comm);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_cpufreq_acct_update_power);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_typec_tcpm_log);

4
drivers/usb/typec/tcpm/tcpm.c
View file

@ -586,6 +586,7 @@ static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
u64 ts_nsec = local_clock();
unsigned long rem_nsec;
bool bypass_log = false;
mutex_lock(&port->logbuffer_lock);
if (!port->logbuffer[port->logbuffer_head]) {
@ -598,6 +599,9 @@ static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
}
vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
trace_android_vh_typec_tcpm_log(tmpbuffer, &bypass_log);
if (bypass_log)
goto abort;
if (tcpm_log_full(port)) {
port->logbuffer_head = max(port->logbuffer_head - 1, 0);

4
include/trace/hooks/typec.h
View file

@ -58,6 +58,10 @@ DECLARE_HOOK(android_vh_typec_tcpm_adj_current_limit,
u32 *current_limit, bool *adjust),
TP_ARGS(state, port_current_limit, port_voltage, pd_capable, current_limit, adjust));
DECLARE_HOOK(android_vh_typec_tcpm_log,
TP_PROTO(const char *log, bool *bypass),
TP_ARGS(log, bypass));
#endif /* _TRACE_HOOK_UFSHCD_H */
/* This part must be outside protection */
#include <trace/define_trace.h>