perf_events: update Intel extra regs shared constraints management (v2)

index 3a0338b..0f8d3ff 100644
@@ -45,6 +45,29 @@ do {								\
 #endif
 
 /*
+ *          |   NHM/WSM    |      SNB     |
+ * register -------------------------------
+ *          |  HT  | no HT |  HT  | no HT |
+ *-----------------------------------------
+ * offcore  | core | core  | cpu  | core  |
+ * lbr_sel  | core | core  | cpu  | core  |
+ * ld_lat   | cpu  | core  | cpu  | core  |
+ *-----------------------------------------
+ *
+ * Given that there is a small number of shared regs,
+ * we can pre-allocate their slot in the per-cpu
+ * per-core reg tables.
+ */
+enum extra_reg_type {
+	EXTRA_REG_NONE  = -1,	/* not used */
+
+	EXTRA_REG_RSP_0 = 0,	/* offcore_response_0 */
+	EXTRA_REG_RSP_1 = 1,	/* offcore_response_1 */
+
+	EXTRA_REG_MAX		/* number of entries needed */
+};
+
+/*
  * best effort, GUP based copy_from_user() that assumes IRQ or NMI context
  */
 static unsigned long

@@ -132,11 +155,10 @@ struct cpu_hw_events {
 	struct perf_branch_entry	lbr_entries[MAX_LBR_ENTRIES];
 
 	/*
-	 * Intel percore register state.
-	 * Coordinate shared resources between HT threads.
+	 * manage shared (per-core, per-cpu) registers
+	 * used on Intel NHM/WSM/SNB
 	 */
-	int				percore_used; /* Used by this CPU? */
-	struct intel_percore		*per_core;
+	struct intel_shared_regs	*shared_regs;
 
 	/*
 	 * AMD specific bits

@@ -187,26 +209,45 @@ struct cpu_hw_events {
 	for ((e) = (c); (e)->weight; (e)++)
 
 /*
+ * Per register state.
+ */
+struct er_account {
+	raw_spinlock_t		lock;	/* per-core: protect structure */
+	u64			config;	/* extra MSR config */
+	u64			reg;	/* extra MSR number */
+	atomic_t		ref;	/* reference count */
+};
+
+/*
  * Extra registers for specific events.
+ *
  * Some events need large masks and require external MSRs.
- * Define a mapping to these extra registers.
+ * Those extra MSRs end up being shared for all events on
+ * a PMU and sometimes between PMU of sibling HT threads.
+ * In either case, the kernel needs to handle conflicting
+ * accesses to those extra, shared, regs. The data structure
+ * to manage those registers is stored in cpu_hw_event.
  */
 struct extra_reg {
 	unsigned int		event;
 	unsigned int		msr;
 	u64			config_mask;
 	u64			valid_mask;
+	int			idx;  /* per_xxx->regs[] reg index */
 };
 
-#define EVENT_EXTRA_REG(e, ms, m, vm) {	\
+#define EVENT_EXTRA_REG(e, ms, m, vm, i) {	\
 	.event = (e),		\
 	.msr = (ms),		\
 	.config_mask = (m),	\
 	.valid_mask = (vm),	\
+	.idx = EXTRA_REG_##i	\
 	}
-#define INTEL_EVENT_EXTRA_REG(event, msr, vm)	\
-	EVENT_EXTRA_REG(event, msr, ARCH_PERFMON_EVENTSEL_EVENT, vm)
-#define EVENT_EXTRA_END EVENT_EXTRA_REG(0, 0, 0, 0)
+
+#define INTEL_EVENT_EXTRA_REG(event, msr, vm, idx)	\
+	EVENT_EXTRA_REG(event, msr, ARCH_PERFMON_EVENTSEL_EVENT, vm, idx)
+
+#define EVENT_EXTRA_END EVENT_EXTRA_REG(0, 0, 0, 0, RSP_0)
 
 union perf_capabilities {
 	struct {

@@ -252,7 +293,6 @@ struct x86_pmu {
 	void		(*put_event_constraints)(struct cpu_hw_events *cpuc,
 						 struct perf_event *event);
 	struct event_constraint *event_constraints;
-	struct event_constraint *percore_constraints;
 	void		(*quirks)(void);
 	int		perfctr_second_write;
 

@@ -393,10 +433,10 @@ static inline unsigned int x86_pmu_event_addr(int index)
  */
 static int x86_pmu_extra_regs(u64 config, struct perf_event *event)
 {
+	struct hw_perf_event_extra *reg;
 	struct extra_reg *er;
 
-	event->hw.extra_reg = 0;
-	event->hw.extra_config = 0;
+	reg = &event->hw.extra_reg;
 
 	if (!x86_pmu.extra_regs)
 		return 0;

@@ -406,8 +446,10 @@ static int x86_pmu_extra_regs(u64 config, struct perf_event *event)
 			continue;
 		if (event->attr.config1 & ~er->valid_mask)
 			return -EINVAL;
-		event->hw.extra_reg = er->msr;
-		event->hw.extra_config = event->attr.config1;
+
+		reg->idx = er->idx;
+		reg->config = event->attr.config1;
+		reg->reg = er->msr;
 		break;
 	}
 	return 0;

@@ -706,6 +748,9 @@ static int __x86_pmu_event_init(struct perf_event *event)
 	event->hw.last_cpu = -1;
 	event->hw.last_tag = ~0ULL;
 
+	/* mark unused */
+	event->hw.extra_reg.idx = EXTRA_REG_NONE;
+
 	return x86_pmu.hw_config(event);
 }
 

@@ -747,8 +792,8 @@ static void x86_pmu_disable(struct pmu *pmu)
 static inline void __x86_pmu_enable_event(struct hw_perf_event *hwc,
 					  u64 enable_mask)
 {
-	if (hwc->extra_reg)
-		wrmsrl(hwc->extra_reg, hwc->extra_config);
+	if (hwc->extra_reg.reg)
+		wrmsrl(hwc->extra_reg.reg, hwc->extra_reg.config);
 	wrmsrl(hwc->config_base, hwc->config | enable_mask);
 }
 

@@ -1685,7 +1730,6 @@ static int validate_group(struct perf_event *event)
 	fake_cpuc = kmalloc(sizeof(*fake_cpuc), GFP_KERNEL | __GFP_ZERO);
 	if (!fake_cpuc)
 		goto out;
-
 	/*
 	 * the event is not yet connected with its
 	 * siblings therefore we must first collect

369 lines not on this page · raw message

index 3412684..941f40d 100644
@@ -536,6 +536,16 @@ struct perf_branch_stack {
 
 struct task_struct;
 
+/*
+ * extra PMU register associated with an event
+ */
+struct hw_perf_event_extra {
+	u64		config;	/* register value */
+	unsigned int	reg;	/* register address or index */
+	int		alloc;	/* extra register already allocated */
+	int		idx;	/* index in shared_regs->regs[] */
+};
+
 /**
  * struct hw_perf_event - performance event hardware details:
  */

@@ -549,9 +559,7 @@ struct hw_perf_event {
 			unsigned long	event_base;
 			int		idx;
 			int		last_cpu;
-			unsigned int	extra_reg;
-			u64		extra_config;
-			int		extra_alloc;
+			struct hw_perf_event_extra extra_reg;
 		};
 		struct { /* software */
 			struct hrtimer	hrtimer;