osfmk/pmc/pmc.c

80 static const char const * pmc_state_state_name(pmc_state_t state) {
81 	switch (PMC_STATE_STATE(state)) {
698 	resv->state = PMC_STATE(PMC_STATE_STATE_STOP, 0, 0);
1109  * The PMC subsystem uses a 3-tuple of state information packed into a 32-bit quantity and a
1111  * of a state, a count of active contexts, and a set of modifier flags.  A state machine defines
1113  * by reading the current 3-tuple, applying the transformations indicated by the state machine
1118  * The state machine is described using tuple notation for the current state and a related notation
1119  * for describing the transformations.  For concisness, the flag and state names are abbreviated as
1139  * tuple = < state, active-context-count, flags >
1140  * state = S | CR | L | R | ST | I | D
1145  * The transform notation is similar, but only describes the modifications made to the current state.
1148  * transform = < state, active-context-count, flags >
1149  * state = S | CR | L | R | ST | I | D
1154  * And now for the state machine:
1439 	/* Determine what state change, if any, we need to do.  Keep trying until either we succeed doing a transition
1443 		oldState = reservation->state;
1445 	} while (newState != PMC_STATE_INVALID && !OSCompareAndSwap(oldState, newState, &(reservation->state)));
1448 		COUNTER_DEBUG("Moved reservation %p from state "PMC_STATE_FORMAT" to state "PMC_STATE_FORMAT" for event %s\n", reservation, PMC_STATE_ARGS(oldState), PMC_STATE_ARGS(newState), pmc_state_event_name(event));
1450 		COUNTER_DEBUG("No valid moves for reservation %p in state "PMC_STATE_FORMAT" for event %s\n", reservation, PMC_STATE_ARGS(oldState), pmc_state_event_name(event));
1468 	/* Move the state machine */
1473 	/* Do any actions required based on the state change */
1489 	/* Move the state machine */
1497 	/* Do any actions required based on the state change */
1507 	assert(PMC_STATE_STATE(reservation->state) == PMC_STATE_STATE_STORE);
1542 	/* Advance the state machine now that the STORE is finished */
1547 	/* Do any actions required based on the state change */
1560 	assert(PMC_STATE_STATE(reservation->state) == PMC_STATE_STATE_LOAD);
1604 	/* Advance the state machine now that the STORE is finished */
1609 	/* Do any actions required based on the state change */
1687 	/* Move the state machine */
1692 	/* A valid state move has been made, but won't be picked up until a context switch occurs.  To cause matching
1698 	/* Spin waiting for the state to turn to INTERRUPT */
1702 	while (PMC_STATE_STATE(reservation->state) != PMC_STATE_STATE_INTERRUPT) {
1732 	/* Move the state machine */
2528 	/* Move the state machine */
2537 		/* A valid state move has been made, but won't be picked up until a context switch occurs.  To cause matching
2552  * to the reservation state, the pmc hardware _will_ stop shortly.
2562 	/* Move the state machine */
2571 		/* A valid state move has been made, but won't be picked up until a context switch occurs.  To cause matching
2605 		uint32_t state = reservation->state;
2607 		if((PMC_STATE_STATE(state) == PMC_STATE_STATE_RUN)) {
2615 		} else if ((PMC_STATE_STATE(state) == PMC_STATE_STATE_STORE) ||
2616 				   (PMC_STATE_STATE(state) == PMC_STATE_STATE_LOAD)) {
2664 		uint32_t state = reservation->state;
2666 		if((PMC_STATE_STATE(state) == PMC_STATE_STATE_RUN)) {
2672 		} else if ((PMC_STATE_STATE(state) == PMC_STATE_STATE_STORE) ||
2673 				   (PMC_STATE_STATE(state) == PMC_STATE_STATE_LOAD)) {
2711 	/* Move the state machine */
2718 		/* A valid state move has been made, but won't be picked up until a context switch occurs.  To cause matching
2725 	/* Block until the reservation hits the <DEALLOC, 0, > state */
2726 	while (!(PMC_STATE_STATE(reservation->state) == PMC_STATE_STATE_DEALLOC && PMC_STATE_CONTEXT_COUNT(reservation->state) == 0 && PMC_STATE_FLAGS(reservation->state) == 0)) {
2741  * pmc_idle notifies eligible monitors of impending per-CPU idle, and can be used to save state.
2766  * pmc_idle_exit notifies eligible monitors of wake from idle; it can be used to restore state.
2792  * state associated with @oldThread (and the task to which @oldThread belongs),
2793  * as well as to restore all pmc state associated with @newThread (and the task