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EPOCH(9): Fix epoch call and drain

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Since the epoch call callbacks may lock/unlock a mutex the callbacks must be
called from within thread context with thread dispatching enabled.  Use thread
pinning to ensure that the calling thread stays on the right processor.  Use
the interrupt server to ensure the thread context for the epoch drain.
This commit is contained in:
Sebastian Huber 2021-06-11 07:40:49 +02:00
parent fb6a312bd6
commit df8f5fc876
1 changed files with 35 additions and 4 deletions
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39
rtemsbsd/rtems/rtems-kernel-epoch.c
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@ -349,15 +349,29 @@ epoch_call(epoch_t epoch, epoch_context_t ctx,
void (*callback) (epoch_context_t))
{
Per_CPU_Control *cpu_self;
struct epoch_record *er;
struct epoch_pcpu *epcpu;
struct epoch_record *er;
#ifdef RTEMS_SMP
ISR_Level level;
Thread_Control *executing;
_ISR_Local_disable(level);
cpu_self = _Per_CPU_Get();
executing = _Per_CPU_Get_executing(cpu_self);
_Thread_Pin(executing);
_ISR_Local_enable(level);
#endif
cpu_self = _Thread_Dispatch_disable();
epcpu = PER_CPU_DATA_GET(cpu_self, struct epoch_pcpu, epoch);
epcpu->cb_count += 1;
er = EPOCH_GET_RECORD(cpu_self, epoch);
ck_epoch_call(&er->er_record, ctx, callback);
#ifdef RTEMS_SMP
cpu_self = _Thread_Dispatch_disable();
_Thread_Unpin(executing, cpu_self);
_Thread_Dispatch_enable(cpu_self);
#endif
}
#ifdef INVARIANTS
@ -411,7 +425,7 @@ epoch_call_drain_cb(void *arg)
struct epoch_record *er;
epoch = arg;
cpu = _Per_CPU_Get();
cpu = _Per_CPU_Get_snapshot();
er = EPOCH_GET_RECORD(cpu, epoch);
epoch_call(epoch, &er->er_drain_ctx, epoch_drain_cb);
}
@ -425,6 +439,7 @@ epoch_drain_callbacks(epoch_t epoch)
uint32_t cpu_max;
rtems_id id;
rtems_status_code sc;
rtems_interrupt_server_request req[CPU_MAXIMUM_PROCESSORS];
#else
struct epoch_record *er;
#endif
@ -433,6 +448,7 @@ epoch_drain_callbacks(epoch_t epoch)
mtx_lock(&epoch->e_drain_mtx);
#ifdef RTEMS_SMP
memset(&req, 0, sizeof(req));
cpu_max = rtems_scheduler_get_processor_maximum();
for (cpu_index = 0; cpu_index <= cpu_max; ++cpu_index) {
@ -445,8 +461,15 @@ epoch_drain_callbacks(epoch_t epoch)
for (cpu_index = 0; cpu_index <= cpu_max; ++cpu_index) {
sc = rtems_scheduler_ident_by_processor(cpu_index, &id);
if (sc == RTEMS_SUCCESSFUL) {
_SMP_Unicast_action(cpu_index, epoch_call_drain_cb,
sc = rtems_interrupt_server_request_initialize(
cpu_index, &req[cpu_index], epoch_call_drain_cb,
epoch);
if (sc == RTEMS_SUCCESSFUL) {
rtems_interrupt_server_request_submit(
&req[cpu_index]);
} else {
panic("no interrupt server for epoch drain");
}
}
}
#else
@ -461,4 +484,12 @@ epoch_drain_callbacks(epoch_t epoch)
mtx_unlock(&epoch->e_drain_mtx);
sx_xunlock(&epoch->e_drain_sx);
#ifdef RTEMS_SMP
for (cpu_index = 0; cpu_index <= cpu_max; ++cpu_index) {
if (req[cpu_index].action.handler != NULL) {
rtems_interrupt_server_request_destroy(&req[cpu_index]);
}
}
#endif
}