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Commit 6bc4c3ad authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull perf fixes from Ingo Molnar:
 "These are the left over fixes from the v4.1 cycle"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf tools: Fix build breakage if prefix= is specified
  perf/x86: Honor the architectural performance monitoring version
  perf/x86/intel: Fix PMI handling for Intel PT
  perf/x86/intel/bts: Fix DS area sharing with x86_pmu events
  perf/x86: Add more Broadwell model numbers
  perf: Fix ring_buffer_attach() RCU sync, again
parents c58267e9 0f02adaa

arch/x86/kernel/cpu/perf_event.c

+52 −19
Original line number Diff line number Diff line
@@ -135,6 +135,7 @@ static int x86_pmu_extra_regs(u64 config, struct perf_event *event) 
}



static atomic_t active_events;

static atomic_t pmc_refcount;

static DEFINE_MUTEX(pmc_reserve_mutex);



#ifdef CONFIG_X86_LOCAL_APIC
@@ -270,11 +271,8 @@ static bool check_hw_exists(void) 


static void hw_perf_event_destroy(struct perf_event *event)

{

	if (atomic_dec_and_mutex_lock(&active_events, &pmc_reserve_mutex)) {

		release_pmc_hardware();

		release_ds_buffers();

		mutex_unlock(&pmc_reserve_mutex);

	}

	x86_release_hardware();

	atomic_dec(&active_events);

}



void hw_perf_lbr_event_destroy(struct perf_event *event)
@@ -324,6 +322,35 @@ set_ext_hw_attr(struct hw_perf_event *hwc, struct perf_event *event) 
	return x86_pmu_extra_regs(val, event);

}



int x86_reserve_hardware(void)

{

	int err = 0;



	if (!atomic_inc_not_zero(&pmc_refcount)) {

		mutex_lock(&pmc_reserve_mutex);

		if (atomic_read(&pmc_refcount) == 0) {

			if (!reserve_pmc_hardware())

				err = -EBUSY;

			else

				reserve_ds_buffers();

		}

		if (!err)

			atomic_inc(&pmc_refcount);

		mutex_unlock(&pmc_reserve_mutex);

	}



	return err;

}



void x86_release_hardware(void)

{

	if (atomic_dec_and_mutex_lock(&pmc_refcount, &pmc_reserve_mutex)) {

		release_pmc_hardware();

		release_ds_buffers();

		mutex_unlock(&pmc_reserve_mutex);

	}

}



/*

 * Check if we can create event of a certain type (that no conflicting events

 * are present).
@@ -336,21 +363,34 @@ int x86_add_exclusive(unsigned int what) 
		return 0;



	mutex_lock(&pmc_reserve_mutex);

	for (i = 0; i < ARRAY_SIZE(x86_pmu.lbr_exclusive); i++)

	for (i = 0; i < ARRAY_SIZE(x86_pmu.lbr_exclusive); i++) {

		if (i != what && atomic_read(&x86_pmu.lbr_exclusive[i]))

			goto out;

	}



	atomic_inc(&x86_pmu.lbr_exclusive[what]);

	ret = 0;



out:

	mutex_unlock(&pmc_reserve_mutex);



	/*

	 * Assuming that all exclusive events will share the PMI handler

	 * (which checks active_events for whether there is work to do),

	 * we can bump active_events counter right here, except for

	 * x86_lbr_exclusive_lbr events that go through x86_pmu_event_init()

	 * path, which already bumps active_events for them.

	 */

	if (!ret && what != x86_lbr_exclusive_lbr)

		atomic_inc(&active_events);



	return ret;

}



void x86_del_exclusive(unsigned int what)

{

	atomic_dec(&x86_pmu.lbr_exclusive[what]);

	atomic_dec(&active_events);

}



int x86_setup_perfctr(struct perf_event *event)
@@ -527,22 +567,11 @@ static int __x86_pmu_event_init(struct perf_event *event) 
	if (!x86_pmu_initialized())

		return -ENODEV;



	err = 0;

	if (!atomic_inc_not_zero(&active_events)) {

		mutex_lock(&pmc_reserve_mutex);

		if (atomic_read(&active_events) == 0) {

			if (!reserve_pmc_hardware())

				err = -EBUSY;

			else

				reserve_ds_buffers();

		}

		if (!err)

			atomic_inc(&active_events);

		mutex_unlock(&pmc_reserve_mutex);

	}

	err = x86_reserve_hardware();

	if (err)

		return err;



	atomic_inc(&active_events);

	event->destroy = hw_perf_event_destroy;



	event->hw.idx = -1;
@@ -1415,6 +1444,10 @@ perf_event_nmi_handler(unsigned int cmd, struct pt_regs *regs) 
	u64 finish_clock;

	int ret;



	/*

	 * All PMUs/events that share this PMI handler should make sure to

	 * increment active_events for their events.

	 */

	if (!atomic_read(&active_events))

		return NMI_DONE;

arch/x86/kernel/cpu/perf_event.h

+4 −0
Original line number Diff line number Diff line
@@ -716,6 +716,10 @@ int x86_add_exclusive(unsigned int what); 


void x86_del_exclusive(unsigned int what);



int x86_reserve_hardware(void);



void x86_release_hardware(void);



void hw_perf_lbr_event_destroy(struct perf_event *event);



int x86_setup_perfctr(struct perf_event *event);

arch/x86/kernel/cpu/perf_event_intel.c

+8 −6
Original line number Diff line number Diff line
@@ -3227,6 +3227,8 @@ __init int intel_pmu_init(void) 


	case 61: /* 14nm Broadwell Core-M */

	case 86: /* 14nm Broadwell Xeon D */

	case 71: /* 14nm Broadwell + GT3e (Intel Iris Pro graphics) */

	case 79: /* 14nm Broadwell Server */

		x86_pmu.late_ack = true;

		memcpy(hw_cache_event_ids, hsw_hw_cache_event_ids, sizeof(hw_cache_event_ids));

		memcpy(hw_cache_extra_regs, hsw_hw_cache_extra_regs, sizeof(hw_cache_extra_regs));
@@ -3296,13 +3298,13 @@ __init int intel_pmu_init(void) 
		 * counter, so do not extend mask to generic counters

		 */

		for_each_event_constraint(c, x86_pmu.event_constraints) {

			if (c->cmask != FIXED_EVENT_FLAGS

			    || c->idxmsk64 == INTEL_PMC_MSK_FIXED_REF_CYCLES) {

				continue;

			}



			if (c->cmask == FIXED_EVENT_FLAGS

			    && c->idxmsk64 != INTEL_PMC_MSK_FIXED_REF_CYCLES) {

				c->idxmsk64 |= (1ULL << x86_pmu.num_counters) - 1;

			c->weight += x86_pmu.num_counters;

			}

			c->idxmsk64 &=

				~(~0UL << (INTEL_PMC_IDX_FIXED + x86_pmu.num_counters_fixed));

			c->weight = hweight64(c->idxmsk64);

		}

	}

arch/x86/kernel/cpu/perf_event_intel_bts.c

+9 −0
Original line number Diff line number Diff line
@@ -483,17 +483,26 @@ static int bts_event_add(struct perf_event *event, int mode) 


static void bts_event_destroy(struct perf_event *event)

{

	x86_release_hardware();

	x86_del_exclusive(x86_lbr_exclusive_bts);

}



static int bts_event_init(struct perf_event *event)

{

	int ret;



	if (event->attr.type != bts_pmu.type)

		return -ENOENT;



	if (x86_add_exclusive(x86_lbr_exclusive_bts))

		return -EBUSY;



	ret = x86_reserve_hardware();

	if (ret) {

		x86_del_exclusive(x86_lbr_exclusive_bts);

		return ret;

	}



	event->destroy = bts_event_destroy;



	return 0;

kernel/events/core.c

+7 −7
Original line number Diff line number Diff line
@@ -4331,20 +4331,20 @@ static void ring_buffer_attach(struct perf_event *event, 
		WARN_ON_ONCE(event->rcu_pending);



		old_rb = event->rb;

		event->rcu_batches = get_state_synchronize_rcu();

		event->rcu_pending = 1;



		spin_lock_irqsave(&old_rb->event_lock, flags);

		list_del_rcu(&event->rb_entry);

		spin_unlock_irqrestore(&old_rb->event_lock, flags);



		event->rcu_batches = get_state_synchronize_rcu();

		event->rcu_pending = 1;

	}



	if (event->rcu_pending && rb) {

	if (rb) {

		if (event->rcu_pending) {

			cond_synchronize_rcu(event->rcu_batches);

			event->rcu_pending = 0;

		}



	if (rb) {

		spin_lock_irqsave(&rb->event_lock, flags);

		list_add_rcu(&event->rb_entry, &rb->event_list);

		spin_unlock_irqrestore(&rb->event_lock, flags);