perf counters: consolidate hw_perf save/restore APIs

Impact: cleanup

Rename them to better match up the usual IRQ disable/enable APIs:

 hw_perf_disable_all()  => hw_perf_save_disable()
 hw_perf_restore_ctrl() => hw_perf_restore()
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/cpu/perf_counter.c

@@ -118,13 +118,13 @@ void hw_perf_enable_all(void)
 	wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, perf_counter_mask, 0);
 }
 
-void hw_perf_restore_ctrl(u64 ctrl)
+void hw_perf_restore(u64 ctrl)
 {
 	wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, ctrl, 0);
 }
-EXPORT_SYMBOL_GPL(hw_perf_restore_ctrl);
+EXPORT_SYMBOL_GPL(hw_perf_restore);
 
-u64 hw_perf_disable_all(void)
+u64 hw_perf_save_disable(void)
 {
 	u64 ctrl;
 
@@ -132,7 +132,7 @@ u64 hw_perf_disable_all(void)
 	wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, 0, 0);
 	return ctrl;
 }
-EXPORT_SYMBOL_GPL(hw_perf_disable_all);
+EXPORT_SYMBOL_GPL(hw_perf_save_disable);
 
 static inline void
 __x86_perf_counter_disable(struct hw_perf_counter *hwc, unsigned int idx)

drivers/acpi/processor_idle.c

@@ -270,11 +270,11 @@ static atomic_t c3_cpu_count;
 /* Common C-state entry for C2, C3, .. */
 static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
 {
-	u64 pctrl;
+	u64 perf_flags;
 
 	/* Don't trace irqs off for idle */
 	stop_critical_timings();
-	pctrl = hw_perf_disable_all();
+	perf_flags = hw_perf_save_disable();
 	if (cstate->entry_method == ACPI_CSTATE_FFH) {
 		/* Call into architectural FFH based C-state */
 		acpi_processor_ffh_cstate_enter(cstate);
@@ -287,7 +287,7 @@ static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
 		   gets asserted in time to freeze execution properly. */
 		unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
 	}
-	hw_perf_restore_ctrl(pctrl);
+	hw_perf_restore(perf_flags);
 	start_critical_timings();
 }
 #endif /* !CONFIG_CPU_IDLE */
@@ -1433,7 +1433,7 @@ static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
 
 	/* Don't trace irqs off for idle */
 	stop_critical_timings();
-	pctrl = hw_perf_disable_all();
+	pctrl = hw_perf_save_disable();
 	if (cx->entry_method == ACPI_CSTATE_FFH) {
 		/* Call into architectural FFH based C-state */
 		acpi_processor_ffh_cstate_enter(cx);
@@ -1448,7 +1448,7 @@ static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
 		   gets asserted in time to freeze execution properly. */
 		unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
 	}
-	hw_perf_restore_ctrl(pctrl);
+	hw_perf_restore(pctrl);
 	start_critical_timings();
 }
 

include/linux/perf_counter.h

@@ -67,7 +67,7 @@ enum perf_counter_record_type {
  * Hardware event to monitor via a performance monitoring counter:
  */
 struct perf_counter_hw_event {
-	u64			type;
+	s64			type;
 
 	u64			irq_period;
 	u32			record_type;
@@ -206,8 +206,8 @@ extern void perf_counter_task_tick(struct task_struct *task, int cpu);
 extern void perf_counter_init_task(struct task_struct *task);
 extern void perf_counter_notify(struct pt_regs *regs);
 extern void perf_counter_print_debug(void);
-extern void hw_perf_restore_ctrl(u64 ctrl);
-extern u64 hw_perf_disable_all(void);
+extern u64 hw_perf_save_disable(void);
+extern void hw_perf_restore(u64 ctrl);
 extern void atomic64_counter_set(struct perf_counter *counter, u64 val64);
 extern u64 atomic64_counter_read(struct perf_counter *counter);
 
@@ -221,8 +221,8 @@ perf_counter_task_tick(struct task_struct *task, int cpu)		{ }
 static inline void perf_counter_init_task(struct task_struct *task)	{ }
 static inline void perf_counter_notify(struct pt_regs *regs)		{ }
 static inline void perf_counter_print_debug(void)			{ }
-static inline void hw_perf_restore_ctrl(u64 ctrl)			{ }
-static inline u64 hw_perf_disable_all(void)		      { return 0; }
+static inline void hw_perf_restore(u64 ctrl)			{ }
+static inline u64 hw_perf_save_disable(void)		      { return 0; }
 #endif
 
 #endif /* _LINUX_PERF_COUNTER_H */

kernel/perf_counter.c

@@ -43,8 +43,8 @@ hw_perf_counter_init(struct perf_counter *counter)
 	return ERR_PTR(-EINVAL);
 }
 
-u64 __weak hw_perf_disable_all(void)		{ return 0; }
-void __weak hw_perf_restore_ctrl(u64 ctrl)	{ }
+u64 __weak hw_perf_save_disable(void)		{ return 0; }
+void __weak hw_perf_restore(u64 ctrl)	{ }
 void __weak hw_perf_counter_setup(void)		{ }
 
 #if BITS_PER_LONG == 64
@@ -180,9 +180,9 @@ static void __perf_counter_remove_from_context(void *info)
 	 * Protect the list operation against NMI by disabling the
 	 * counters on a global level. NOP for non NMI based counters.
 	 */
-	perf_flags = hw_perf_disable_all();
+	perf_flags = hw_perf_save_disable();
 	list_del_counter(counter, ctx);
-	hw_perf_restore_ctrl(perf_flags);
+	hw_perf_restore(perf_flags);
 
 	if (!ctx->task) {
 		/*
@@ -273,9 +273,9 @@ static void __perf_install_in_context(void *info)
 	 * Protect the list operation against NMI by disabling the
 	 * counters on a global level. NOP for non NMI based counters.
 	 */
-	perf_flags = hw_perf_disable_all();
+	perf_flags = hw_perf_save_disable();
 	list_add_counter(counter, ctx);
-	hw_perf_restore_ctrl(perf_flags);
+	hw_perf_restore(perf_flags);
 
 	ctx->nr_counters++;
 
@@ -495,13 +495,13 @@ void perf_counter_task_tick(struct task_struct *curr, int cpu)
 	/*
 	 * Rotate the first entry last (works just fine for group counters too):
 	 */
-	perf_flags = hw_perf_disable_all();
+	perf_flags = hw_perf_save_disable();
 	list_for_each_entry(counter, &ctx->counter_list, list_entry) {
 		list_del(&counter->list_entry);
 		list_add_tail(&counter->list_entry, &ctx->counter_list);
 		break;
 	}
-	hw_perf_restore_ctrl(perf_flags);
+	hw_perf_restore(perf_flags);
 
 	spin_unlock(&ctx->lock);