Merge branch 'perf/core' into perf/timer, before applying new changes

Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/arm/kernel/hw_breakpoint.c

@@ -648,7 +648,7 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
 		 * Per-cpu breakpoints are not supported by our stepping
 		 * mechanism.
 		 */
-		if (!bp->hw.bp_target)
+		if (!bp->hw.target)
 			return -EINVAL;
 
 		/*

arch/arm64/kernel/hw_breakpoint.c

@@ -527,7 +527,7 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
 	 * Disallow per-task kernel breakpoints since these would
 	 * complicate the stepping code.
 	 */
-	if (info->ctrl.privilege == AARCH64_BREAKPOINT_EL1 && bp->hw.bp_target)
+	if (info->ctrl.privilege == AARCH64_BREAKPOINT_EL1 && bp->hw.target)
 		return -EINVAL;
 
 	return 0;

arch/powerpc/perf/core-book3s.c

@@ -124,7 +124,7 @@ static unsigned long ebb_switch_in(bool ebb, struct cpu_hw_events *cpuhw)
 
 static inline void power_pmu_bhrb_enable(struct perf_event *event) {}
 static inline void power_pmu_bhrb_disable(struct perf_event *event) {}
-static void power_pmu_flush_branch_stack(void) {}
+static void power_pmu_sched_task(struct perf_event_context *ctx, bool sched_in) {}
 static inline void power_pmu_bhrb_read(struct cpu_hw_events *cpuhw) {}
 static void pmao_restore_workaround(bool ebb) { }
 #endif /* CONFIG_PPC32 */
@@ -350,6 +350,7 @@ static void power_pmu_bhrb_enable(struct perf_event *event)
 		cpuhw->bhrb_context = event->ctx;
 	}
 	cpuhw->bhrb_users++;
+	perf_sched_cb_inc(event->ctx->pmu);
 }
 
 static void power_pmu_bhrb_disable(struct perf_event *event)
@@ -361,6 +362,7 @@ static void power_pmu_bhrb_disable(struct perf_event *event)
 
 	cpuhw->bhrb_users--;
 	WARN_ON_ONCE(cpuhw->bhrb_users < 0);
+	perf_sched_cb_dec(event->ctx->pmu);
 
 	if (!cpuhw->disabled && !cpuhw->bhrb_users) {
 		/* BHRB cannot be turned off when other
@@ -375,9 +377,12 @@ static void power_pmu_bhrb_disable(struct perf_event *event)
 /* Called from ctxsw to prevent one process's branch entries to
  * mingle with the other process's entries during context switch.
  */
-static void power_pmu_flush_branch_stack(void)
+static void power_pmu_sched_task(struct perf_event_context *ctx, bool sched_in)
 {
-	if (ppmu->bhrb_nr)
+	if (!ppmu->bhrb_nr)
+		return;
+
+	if (sched_in)
 		power_pmu_bhrb_reset();
 }
 /* Calculate the to address for a branch */
@@ -1901,7 +1906,7 @@ static struct pmu power_pmu = {
 	.cancel_txn	= power_pmu_cancel_txn,
 	.commit_txn	= power_pmu_commit_txn,
 	.event_idx	= power_pmu_event_idx,
-	.flush_branch_stack = power_pmu_flush_branch_stack,
+	.sched_task	= power_pmu_sched_task,
 };
 
 /*

arch/x86/include/asm/cpufeature.h

@@ -12,7 +12,7 @@
 #include <asm/disabled-features.h>
 #endif
 
-#define NCAPINTS	11	/* N 32-bit words worth of info */
+#define NCAPINTS	13	/* N 32-bit words worth of info */
 #define NBUGINTS	1	/* N 32-bit bug flags */
 
 /*
@@ -226,6 +226,7 @@
 #define X86_FEATURE_ERMS	( 9*32+ 9) /* Enhanced REP MOVSB/STOSB */
 #define X86_FEATURE_INVPCID	( 9*32+10) /* Invalidate Processor Context ID */
 #define X86_FEATURE_RTM		( 9*32+11) /* Restricted Transactional Memory */
+#define X86_FEATURE_CQM		( 9*32+12) /* Cache QoS Monitoring */
 #define X86_FEATURE_MPX		( 9*32+14) /* Memory Protection Extension */
 #define X86_FEATURE_AVX512F	( 9*32+16) /* AVX-512 Foundation */
 #define X86_FEATURE_RDSEED	( 9*32+18) /* The RDSEED instruction */
@@ -242,6 +243,12 @@
 #define X86_FEATURE_XGETBV1	(10*32+ 2) /* XGETBV with ECX = 1 */
 #define X86_FEATURE_XSAVES	(10*32+ 3) /* XSAVES/XRSTORS */
 
+/* Intel-defined CPU QoS Sub-leaf, CPUID level 0x0000000F:0 (edx), word 11 */
+#define X86_FEATURE_CQM_LLC	(11*32+ 1) /* LLC QoS if 1 */
+
+/* Intel-defined CPU QoS Sub-leaf, CPUID level 0x0000000F:1 (edx), word 12 */
+#define X86_FEATURE_CQM_OCCUP_LLC (12*32+ 0) /* LLC occupancy monitoring if 1 */
+
 /*
  * BUG word(s)
  */

arch/x86/include/asm/processor.h

@@ -109,6 +109,9 @@ struct cpuinfo_x86 {
 	/* in KB - valid for CPUS which support this call: */
 	int			x86_cache_size;
 	int			x86_cache_alignment;	/* In bytes */
+	/* Cache QoS architectural values: */
+	int			x86_cache_max_rmid;	/* max index */
+	int			x86_cache_occ_scale;	/* scale to bytes */
 	int			x86_power;
 	unsigned long		loops_per_jiffy;
 	/* cpuid returned max cores value: */

arch/x86/kernel/cpu/Makefile

@@ -39,7 +39,7 @@ obj-$(CONFIG_CPU_SUP_AMD)		+= perf_event_amd_iommu.o
 endif
 obj-$(CONFIG_CPU_SUP_INTEL)		+= perf_event_p6.o perf_event_knc.o perf_event_p4.o
 obj-$(CONFIG_CPU_SUP_INTEL)		+= perf_event_intel_lbr.o perf_event_intel_ds.o perf_event_intel.o
-obj-$(CONFIG_CPU_SUP_INTEL)		+= perf_event_intel_rapl.o
+obj-$(CONFIG_CPU_SUP_INTEL)		+= perf_event_intel_rapl.o perf_event_intel_cqm.o
 
 obj-$(CONFIG_PERF_EVENTS_INTEL_UNCORE)	+= perf_event_intel_uncore.o \
 					   perf_event_intel_uncore_snb.o \

arch/x86/kernel/cpu/common.c

@@ -646,6 +646,30 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
 		c->x86_capability[10] = eax;
 	}
 
+	/* Additional Intel-defined flags: level 0x0000000F */
+	if (c->cpuid_level >= 0x0000000F) {
+		u32 eax, ebx, ecx, edx;
+
+		/* QoS sub-leaf, EAX=0Fh, ECX=0 */
+		cpuid_count(0x0000000F, 0, &eax, &ebx, &ecx, &edx);
+		c->x86_capability[11] = edx;
+		if (cpu_has(c, X86_FEATURE_CQM_LLC)) {
+			/* will be overridden if occupancy monitoring exists */
+			c->x86_cache_max_rmid = ebx;
+
+			/* QoS sub-leaf, EAX=0Fh, ECX=1 */
+			cpuid_count(0x0000000F, 1, &eax, &ebx, &ecx, &edx);
+			c->x86_capability[12] = edx;
+			if (cpu_has(c, X86_FEATURE_CQM_OCCUP_LLC)) {
+				c->x86_cache_max_rmid = ecx;
+				c->x86_cache_occ_scale = ebx;
+			}
+		} else {
+			c->x86_cache_max_rmid = -1;
+			c->x86_cache_occ_scale = -1;
+		}
+	}
+
 	/* AMD-defined flags: level 0x80000001 */
 	xlvl = cpuid_eax(0x80000000);
 	c->extended_cpuid_level = xlvl;
@@ -834,6 +858,20 @@ static void generic_identify(struct cpuinfo_x86 *c)
 	detect_nopl(c);
 }
 
+static void x86_init_cache_qos(struct cpuinfo_x86 *c)
+{
+	/*
+	 * The heavy lifting of max_rmid and cache_occ_scale are handled
+	 * in get_cpu_cap().  Here we just set the max_rmid for the boot_cpu
+	 * in case CQM bits really aren't there in this CPU.
+	 */
+	if (c != &boot_cpu_data) {
+		boot_cpu_data.x86_cache_max_rmid =
+			min(boot_cpu_data.x86_cache_max_rmid,
+			    c->x86_cache_max_rmid);
+	}
+}
+
 /*
  * This does the hard work of actually picking apart the CPU stuff...
  */
@@ -923,6 +961,7 @@ static void identify_cpu(struct cpuinfo_x86 *c)
 
 	init_hypervisor(c);
 	x86_init_rdrand(c);
+	x86_init_cache_qos(c);
 
 	/*
 	 * Clear/Set all flags overriden by options, need do it

arch/x86/kernel/cpu/perf_event.c

@@ -399,39 +399,41 @@ int x86_pmu_hw_config(struct perf_event *event)
 
 		if (event->attr.precise_ip > precise)
 			return -EOPNOTSUPP;
-		/*
-		 * check that PEBS LBR correction does not conflict with
-		 * whatever the user is asking with attr->branch_sample_type
-		 */
-		if (event->attr.precise_ip > 1 &&
-		    x86_pmu.intel_cap.pebs_format < 2) {
-			u64 *br_type = &event->attr.branch_sample_type;
-
-			if (has_branch_stack(event)) {
-				if (!precise_br_compat(event))
-					return -EOPNOTSUPP;
-
-				/* branch_sample_type is compatible */
-
-			} else {
-				/*
-				 * user did not specify  branch_sample_type
-				 *
-				 * For PEBS fixups, we capture all
-				 * the branches at the priv level of the
-				 * event.
-				 */
-				*br_type = PERF_SAMPLE_BRANCH_ANY;
-
-				if (!event->attr.exclude_user)
-					*br_type |= PERF_SAMPLE_BRANCH_USER;
-
-				if (!event->attr.exclude_kernel)
-					*br_type |= PERF_SAMPLE_BRANCH_KERNEL;
-			}
+	}
+	/*
+	 * check that PEBS LBR correction does not conflict with
+	 * whatever the user is asking with attr->branch_sample_type
+	 */
+	if (event->attr.precise_ip > 1 && x86_pmu.intel_cap.pebs_format < 2) {
+		u64 *br_type = &event->attr.branch_sample_type;
+
+		if (has_branch_stack(event)) {
+			if (!precise_br_compat(event))
+				return -EOPNOTSUPP;
+
+			/* branch_sample_type is compatible */
+
+		} else {
+			/*
+			 * user did not specify  branch_sample_type
+			 *
+			 * For PEBS fixups, we capture all
+			 * the branches at the priv level of the
+			 * event.
+			 */
+			*br_type = PERF_SAMPLE_BRANCH_ANY;
+
+			if (!event->attr.exclude_user)
+				*br_type |= PERF_SAMPLE_BRANCH_USER;
+
+			if (!event->attr.exclude_kernel)
+				*br_type |= PERF_SAMPLE_BRANCH_KERNEL;
 		}
 	}
 
+	if (event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_CALL_STACK)
+		event->attach_state |= PERF_ATTACH_TASK_DATA;
+
 	/*
 	 * Generate PMC IRQs:
 	 * (keep 'enabled' bit clear for now)
@@ -449,6 +451,12 @@ int x86_pmu_hw_config(struct perf_event *event)
 	if (event->attr.type == PERF_TYPE_RAW)
 		event->hw.config |= event->attr.config & X86_RAW_EVENT_MASK;
 
+	if (event->attr.sample_period && x86_pmu.limit_period) {
+		if (x86_pmu.limit_period(event, event->attr.sample_period) >
+				event->attr.sample_period)
+			return -EINVAL;
+	}
+
 	return x86_setup_perfctr(event);
 }
 
@@ -986,6 +994,9 @@ int x86_perf_event_set_period(struct perf_event *event)
 	if (left > x86_pmu.max_period)
 		left = x86_pmu.max_period;
 
+	if (x86_pmu.limit_period)
+		left = x86_pmu.limit_period(event, left);
+
 	per_cpu(pmc_prev_left[idx], smp_processor_id()) = left;
 
 	/*
@@ -1033,7 +1044,6 @@ static int x86_pmu_add(struct perf_event *event, int flags)
 
 	hwc = &event->hw;
 
-	perf_pmu_disable(event->pmu);
 	n0 = cpuc->n_events;
 	ret = n = collect_events(cpuc, event, false);
 	if (ret < 0)
@@ -1071,7 +1081,6 @@ static int x86_pmu_add(struct perf_event *event, int flags)
 
 	ret = 0;
 out:
-	perf_pmu_enable(event->pmu);
 	return ret;
 }
 
@@ -1914,10 +1923,10 @@ static const struct attribute_group *x86_pmu_attr_groups[] = {
 	NULL,
 };
 
-static void x86_pmu_flush_branch_stack(void)
+static void x86_pmu_sched_task(struct perf_event_context *ctx, bool sched_in)
 {
-	if (x86_pmu.flush_branch_stack)
-		x86_pmu.flush_branch_stack();
+	if (x86_pmu.sched_task)
+		x86_pmu.sched_task(ctx, sched_in);
 }
 
 void perf_check_microcode(void)
@@ -1949,7 +1958,8 @@ static struct pmu pmu = {
 	.commit_txn		= x86_pmu_commit_txn,
 
 	.event_idx		= x86_pmu_event_idx,
-	.flush_branch_stack	= x86_pmu_flush_branch_stack,
+	.sched_task		= x86_pmu_sched_task,
+	.task_ctx_size          = sizeof(struct x86_perf_task_context),
 };
 
 void arch_perf_update_userpage(struct perf_event *event,

arch/x86/kernel/cpu/perf_event.h

@@ -451,6 +451,7 @@ struct x86_pmu {
 	struct x86_pmu_quirk *quirks;
 	int		perfctr_second_write;
 	bool		late_ack;
+	unsigned	(*limit_period)(struct perf_event *event, unsigned l);
 
 	/*
 	 * sysfs attrs
@@ -472,7 +473,8 @@ struct x86_pmu {
 	void		(*cpu_dead)(int cpu);
 
 	void		(*check_microcode)(void);
-	void		(*flush_branch_stack)(void);
+	void		(*sched_task)(struct perf_event_context *ctx,
+				      bool sched_in);
 
 	/*
 	 * Intel Arch Perfmon v2+
@@ -515,6 +517,13 @@ struct x86_pmu {
 	struct perf_guest_switch_msr *(*guest_get_msrs)(int *nr);
 };
 
+struct x86_perf_task_context {
+	u64 lbr_from[MAX_LBR_ENTRIES];
+	u64 lbr_to[MAX_LBR_ENTRIES];
+	int lbr_callstack_users;
+	int lbr_stack_state;
+};
+
 #define x86_add_quirk(func_)						\
 do {									\
 	static struct x86_pmu_quirk __quirk __initdata = {		\
@@ -546,6 +555,12 @@ static struct perf_pmu_events_attr event_attr_##v = {			\
 
 extern struct x86_pmu x86_pmu __read_mostly;
 
+static inline bool x86_pmu_has_lbr_callstack(void)
+{
+	return  x86_pmu.lbr_sel_map &&
+		x86_pmu.lbr_sel_map[PERF_SAMPLE_BRANCH_CALL_STACK_SHIFT] > 0;
+}
+
 DECLARE_PER_CPU(struct cpu_hw_events, cpu_hw_events);
 
 int x86_perf_event_set_period(struct perf_event *event);
@@ -727,6 +742,8 @@ void intel_pmu_pebs_disable_all(void);
 
 void intel_ds_init(void);
 
+void intel_pmu_lbr_sched_task(struct perf_event_context *ctx, bool sched_in);
+
 void intel_pmu_lbr_reset(void);
 
 void intel_pmu_lbr_enable(struct perf_event *event);
@@ -747,6 +764,8 @@ void intel_pmu_lbr_init_atom(void);
 
 void intel_pmu_lbr_init_snb(void);
 
+void intel_pmu_lbr_init_hsw(void);
+
 int intel_pmu_setup_lbr_filter(struct perf_event *event);
 
 int p4_pmu_init(void);

arch/x86/kernel/cpu/perf_event_amd_ibs.c

@@ -796,7 +796,7 @@ static int setup_ibs_ctl(int ibs_eilvt_off)
  * the IBS interrupt vector is handled by perf_ibs_cpu_notifier that
  * is using the new offset.
  */
-static int force_ibs_eilvt_setup(void)
+static void force_ibs_eilvt_setup(void)
 {
 	int offset;
 	int ret;
@@ -811,26 +811,24 @@ static int force_ibs_eilvt_setup(void)
 
 	if (offset == APIC_EILVT_NR_MAX) {
 		printk(KERN_DEBUG "No EILVT entry available\n");
-		return -EBUSY;
+		return;
 	}
 
 	ret = setup_ibs_ctl(offset);
 	if (ret)
 		goto out;
 
-	if (!ibs_eilvt_valid()) {
-		ret = -EFAULT;
+	if (!ibs_eilvt_valid())
 		goto out;
-	}
 
 	pr_info("IBS: LVT offset %d assigned\n", offset);
 
-	return 0;
+	return;
 out:
 	preempt_disable();
 	put_eilvt(offset);
 	preempt_enable();
-	return ret;
+	return;
 }
 
 static void ibs_eilvt_setup(void)

arch/x86/kernel/cpu/perf_event_intel_uncore_snbep.c

@@ -1132,8 +1132,7 @@ static int snbep_pci2phy_map_init(int devid)
 		}
 	}
 
-	if (ubox_dev)
-		pci_dev_put(ubox_dev);
+	pci_dev_put(ubox_dev);
 
 	return err ? pcibios_err_to_errno(err) : 0;
 }

arch/x86/kernel/kprobes/core.c

@@ -354,6 +354,7 @@ int __copy_instruction(u8 *dest, u8 *src)
 {
 	struct insn insn;
 	kprobe_opcode_t buf[MAX_INSN_SIZE];
+	int length;
 	unsigned long recovered_insn =
 		recover_probed_instruction(buf, (unsigned long)src);
 
@@ -361,16 +362,18 @@ int __copy_instruction(u8 *dest, u8 *src)
 		return 0;
 	kernel_insn_init(&insn, (void *)recovered_insn, MAX_INSN_SIZE);
 	insn_get_length(&insn);
+	length = insn.length;
+
 	/* Another subsystem puts a breakpoint, failed to recover */
 	if (insn.opcode.bytes[0] == BREAKPOINT_INSTRUCTION)
 		return 0;
-	memcpy(dest, insn.kaddr, insn.length);
+	memcpy(dest, insn.kaddr, length);
 
 #ifdef CONFIG_X86_64
 	if (insn_rip_relative(&insn)) {
 		s64 newdisp;
 		u8 *disp;
-		kernel_insn_init(&insn, dest, insn.length);
+		kernel_insn_init(&insn, dest, length);
 		insn_get_displacement(&insn);
 		/*
 		 * The copied instruction uses the %rip-relative addressing
@@ -394,7 +397,7 @@ int __copy_instruction(u8 *dest, u8 *src)
 		*(s32 *) disp = (s32) newdisp;
 	}
 #endif
-	return insn.length;
+	return length;
 }
 
 static int arch_copy_kprobe(struct kprobe *p)

include/linux/perf_event.h

@@ -53,6 +53,7 @@ struct perf_guest_info_callbacks {
 #include <linux/sysfs.h>
 #include <linux/perf_regs.h>
 #include <linux/workqueue.h>
+#include <linux/cgroup.h>
 #include <asm/local.h>
 
 struct perf_callchain_entry {
@@ -118,10 +119,16 @@ struct hw_perf_event {
 			struct hrtimer	hrtimer;
 		};
 		struct { /* tracepoint */
-			struct task_struct	*tp_target;
 			/* for tp_event->class */
 			struct list_head	tp_list;
 		};
+		struct { /* intel_cqm */
+			int			cqm_state;
+			int			cqm_rmid;
+			struct list_head	cqm_events_entry;
+			struct list_head	cqm_groups_entry;
+			struct list_head	cqm_group_entry;
+		};
 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 		struct { /* breakpoint */
 			/*
@@ -129,12 +136,12 @@ struct hw_perf_event {
 			 * problem hw_breakpoint has with context
 			 * creation and event initalization.
 			 */
-			struct task_struct		*bp_target;
 			struct arch_hw_breakpoint	info;
 			struct list_head		bp_list;
 		};
 #endif
 	};
+	struct task_struct		*target;
 	int				state;
 	local64_t			prev_count;
 	u64				sample_period;
@@ -262,9 +269,20 @@ struct pmu {
 	int (*event_idx)		(struct perf_event *event); /*optional */
 
 	/*
-	 * flush branch stack on context-switches (needed in cpu-wide mode)
+	 * context-switches callback
+	 */
+	void (*sched_task)		(struct perf_event_context *ctx,
+					bool sched_in);
+	/*
+	 * PMU specific data size
+	 */
+	size_t				task_ctx_size;
+
+
+	/*
+	 * Return the count value for a counter.
 	 */
-	void (*flush_branch_stack)	(void);
+	u64 (*count)			(struct perf_event *event); /*optional*/
 };
 
 /**
@@ -300,6 +318,7 @@ struct swevent_hlist {
 #define PERF_ATTACH_CONTEXT	0x01
 #define PERF_ATTACH_GROUP	0x02
 #define PERF_ATTACH_TASK	0x04
+#define PERF_ATTACH_TASK_DATA	0x08
 
 struct perf_cgroup;
 struct ring_buffer;
@@ -504,7 +523,7 @@ struct perf_event_context {
 	u64				generation;
 	int				pin_count;
 	int				nr_cgroups;	 /* cgroup evts */
-	int				nr_branch_stack; /* branch_stack evt */
+	void				*task_ctx_data; /* pmu specific data */
 	struct rcu_head			rcu_head;
 
 	struct delayed_work		orphans_remove;
@@ -540,6 +559,35 @@ struct perf_output_handle {
 	int				page;
 };
 
+#ifdef CONFIG_CGROUP_PERF
+
+/*
+ * perf_cgroup_info keeps track of time_enabled for a cgroup.
+ * This is a per-cpu dynamically allocated data structure.
+ */
+struct perf_cgroup_info {
+	u64				time;
+	u64				timestamp;
+};
+
+struct perf_cgroup {
+	struct cgroup_subsys_state	css;
+	struct perf_cgroup_info	__percpu *info;
+};
+
+/*
+ * Must ensure cgroup is pinned (css_get) before calling
+ * this function. In other words, we cannot call this function
+ * if there is no cgroup event for the current CPU context.
+ */
+static inline struct perf_cgroup *
+perf_cgroup_from_task(struct task_struct *task)
+{
+	return container_of(task_css(task, perf_event_cgrp_id),
+			    struct perf_cgroup, css);
+}
+#endif /* CONFIG_CGROUP_PERF */
+
 #ifdef CONFIG_PERF_EVENTS
 
 extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
@@ -558,6 +606,8 @@ extern void perf_event_delayed_put(struct task_struct *task);
 extern void perf_event_print_debug(void);
 extern void perf_pmu_disable(struct pmu *pmu);
 extern void perf_pmu_enable(struct pmu *pmu);
+extern void perf_sched_cb_dec(struct pmu *pmu);
+extern void perf_sched_cb_inc(struct pmu *pmu);
 extern int perf_event_task_disable(void);
 extern int perf_event_task_enable(void);
 extern int perf_event_refresh(struct perf_event *event, int refresh);
@@ -731,6 +781,11 @@ static inline void perf_event_task_sched_out(struct task_struct *prev,
 		__perf_event_task_sched_out(prev, next);
 }
 
+static inline u64 __perf_event_count(struct perf_event *event)
+{
+	return local64_read(&event->count) + atomic64_read(&event->child_count);
+}
+
 extern void perf_event_mmap(struct vm_area_struct *vma);
 extern struct perf_guest_info_callbacks *perf_guest_cbs;
 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
@@ -800,6 +855,11 @@ static inline bool has_branch_stack(struct perf_event *event)
 	return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
 }
 
+static inline bool needs_branch_stack(struct perf_event *event)
+{
+	return event->attr.branch_sample_type != 0;
+}
+
 extern int perf_output_begin(struct perf_output_handle *handle,
 			     struct perf_event *event, unsigned int size);
 extern void perf_output_end(struct perf_output_handle *handle);

include/uapi/linux/perf_event.h

@@ -152,21 +152,42 @@ enum perf_event_sample_format {
  * The branch types can be combined, however BRANCH_ANY covers all types
  * of branches and therefore it supersedes all the other types.
  */
+enum perf_branch_sample_type_shift {
+	PERF_SAMPLE_BRANCH_USER_SHIFT		= 0, /* user branches */
+	PERF_SAMPLE_BRANCH_KERNEL_SHIFT		= 1, /* kernel branches */
+	PERF_SAMPLE_BRANCH_HV_SHIFT		= 2, /* hypervisor branches */
+
+	PERF_SAMPLE_BRANCH_ANY_SHIFT		= 3, /* any branch types */
+	PERF_SAMPLE_BRANCH_ANY_CALL_SHIFT	= 4, /* any call branch */
+	PERF_SAMPLE_BRANCH_ANY_RETURN_SHIFT	= 5, /* any return branch */
+	PERF_SAMPLE_BRANCH_IND_CALL_SHIFT	= 6, /* indirect calls */
+	PERF_SAMPLE_BRANCH_ABORT_TX_SHIFT	= 7, /* transaction aborts */
+	PERF_SAMPLE_BRANCH_IN_TX_SHIFT		= 8, /* in transaction */
+	PERF_SAMPLE_BRANCH_NO_TX_SHIFT		= 9, /* not in transaction */
+	PERF_SAMPLE_BRANCH_COND_SHIFT		= 10, /* conditional branches */
+
+	PERF_SAMPLE_BRANCH_CALL_STACK_SHIFT	= 11, /* call/ret stack */
+
+	PERF_SAMPLE_BRANCH_MAX_SHIFT		/* non-ABI */
+};
+
 enum perf_branch_sample_type {
-	PERF_SAMPLE_BRANCH_USER		= 1U << 0, /* user branches */
-	PERF_SAMPLE_BRANCH_KERNEL	= 1U << 1, /* kernel branches */
-	PERF_SAMPLE_BRANCH_HV		= 1U << 2, /* hypervisor branches */
-
-	PERF_SAMPLE_BRANCH_ANY		= 1U << 3, /* any branch types */
-	PERF_SAMPLE_BRANCH_ANY_CALL	= 1U << 4, /* any call branch */
-	PERF_SAMPLE_BRANCH_ANY_RETURN	= 1U << 5, /* any return branch */
-	PERF_SAMPLE_BRANCH_IND_CALL	= 1U << 6, /* indirect calls */
-	PERF_SAMPLE_BRANCH_ABORT_TX	= 1U << 7, /* transaction aborts */
-	PERF_SAMPLE_BRANCH_IN_TX	= 1U << 8, /* in transaction */
-	PERF_SAMPLE_BRANCH_NO_TX	= 1U << 9, /* not in transaction */
-	PERF_SAMPLE_BRANCH_COND		= 1U << 10, /* conditional branches */
-
-	PERF_SAMPLE_BRANCH_MAX		= 1U << 11, /* non-ABI */
+	PERF_SAMPLE_BRANCH_USER		= 1U << PERF_SAMPLE_BRANCH_USER_SHIFT,
+	PERF_SAMPLE_BRANCH_KERNEL	= 1U << PERF_SAMPLE_BRANCH_KERNEL_SHIFT,
+	PERF_SAMPLE_BRANCH_HV		= 1U << PERF_SAMPLE_BRANCH_HV_SHIFT,
+
+	PERF_SAMPLE_BRANCH_ANY		= 1U << PERF_SAMPLE_BRANCH_ANY_SHIFT,
+	PERF_SAMPLE_BRANCH_ANY_CALL	= 1U << PERF_SAMPLE_BRANCH_ANY_CALL_SHIFT,
+	PERF_SAMPLE_BRANCH_ANY_RETURN	= 1U << PERF_SAMPLE_BRANCH_ANY_RETURN_SHIFT,
+	PERF_SAMPLE_BRANCH_IND_CALL	= 1U << PERF_SAMPLE_BRANCH_IND_CALL_SHIFT,
+	PERF_SAMPLE_BRANCH_ABORT_TX	= 1U << PERF_SAMPLE_BRANCH_ABORT_TX_SHIFT,
+	PERF_SAMPLE_BRANCH_IN_TX	= 1U << PERF_SAMPLE_BRANCH_IN_TX_SHIFT,
+	PERF_SAMPLE_BRANCH_NO_TX	= 1U << PERF_SAMPLE_BRANCH_NO_TX_SHIFT,
+	PERF_SAMPLE_BRANCH_COND		= 1U << PERF_SAMPLE_BRANCH_COND_SHIFT,
+
+	PERF_SAMPLE_BRANCH_CALL_STACK	= 1U << PERF_SAMPLE_BRANCH_CALL_STACK_SHIFT,
+
+	PERF_SAMPLE_BRANCH_MAX		= 1U << PERF_SAMPLE_BRANCH_MAX_SHIFT,
 };
 
 #define PERF_SAMPLE_BRANCH_PLM_ALL \

kernel/events/hw_breakpoint.c

@@ -116,12 +116,12 @@ static unsigned int max_task_bp_pinned(int cpu, enum bp_type_idx type)
  */
 static int task_bp_pinned(int cpu, struct perf_event *bp, enum bp_type_idx type)
 {
-	struct task_struct *tsk = bp->hw.bp_target;
+	struct task_struct *tsk = bp->hw.target;
 	struct perf_event *iter;
 	int count = 0;
 
 	list_for_each_entry(iter, &bp_task_head, hw.bp_list) {
-		if (iter->hw.bp_target == tsk &&
+		if (iter->hw.target == tsk &&
 		    find_slot_idx(iter) == type &&
 		    (iter->cpu < 0 || cpu == iter->cpu))
 			count += hw_breakpoint_weight(iter);
@@ -153,7 +153,7 @@ fetch_bp_busy_slots(struct bp_busy_slots *slots, struct perf_event *bp,
 		int nr;
 
 		nr = info->cpu_pinned;
-		if (!bp->hw.bp_target)
+		if (!bp->hw.target)
 			nr += max_task_bp_pinned(cpu, type);
 		else
 			nr += task_bp_pinned(cpu, bp, type);
@@ -210,7 +210,7 @@ toggle_bp_slot(struct perf_event *bp, bool enable, enum bp_type_idx type,
 		weight = -weight;
 
 	/* Pinned counter cpu profiling */
-	if (!bp->hw.bp_target) {
+	if (!bp->hw.target) {
 		get_bp_info(bp->cpu, type)->cpu_pinned += weight;
 		return;
 	}

kernel/trace/trace_uprobe.c

@@ -1005,7 +1005,7 @@ __uprobe_perf_filter(struct trace_uprobe_filter *filter, struct mm_struct *mm)
 		return true;
 
 	list_for_each_entry(event, &filter->perf_events, hw.tp_list) {
-		if (event->hw.tp_target->mm == mm)
+		if (event->hw.target->mm == mm)
 			return true;
 	}
 
@@ -1015,7 +1015,7 @@ __uprobe_perf_filter(struct trace_uprobe_filter *filter, struct mm_struct *mm)
 static inline bool
 uprobe_filter_event(struct trace_uprobe *tu, struct perf_event *event)
 {
-	return __uprobe_perf_filter(&tu->filter, event->hw.tp_target->mm);
+	return __uprobe_perf_filter(&tu->filter, event->hw.target->mm);
 }
 
 static int uprobe_perf_close(struct trace_uprobe *tu, struct perf_event *event)
@@ -1023,10 +1023,10 @@ static int uprobe_perf_close(struct trace_uprobe *tu, struct perf_event *event)
 	bool done;
 
 	write_lock(&tu->filter.rwlock);
-	if (event->hw.tp_target) {
+	if (event->hw.target) {
 		list_del(&event->hw.tp_list);
 		done = tu->filter.nr_systemwide ||
-			(event->hw.tp_target->flags & PF_EXITING) ||
+			(event->hw.target->flags & PF_EXITING) ||
 			uprobe_filter_event(tu, event);
 	} else {
 		tu->filter.nr_systemwide--;
@@ -1046,7 +1046,7 @@ static int uprobe_perf_open(struct trace_uprobe *tu, struct perf_event *event)
 	int err;
 
 	write_lock(&tu->filter.rwlock);
-	if (event->hw.tp_target) {
+	if (event->hw.target) {
 		/*
 		 * event->parent != NULL means copy_process(), we can avoid
 		 * uprobe_apply(). current->mm must be probed and we can rely

tools/build/Build.include

+###
+# build: Generic definitions
+#
+#  Lots of this code have been borrowed or heavily inspired from parts
+#  of kbuild code, which is not credited, but mostly developed by:
+#
+#  Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
+#  Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
+#
+
+###
+# Convenient variables
+comma   := ,
+squote  := '
+
+###
+# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
+dot-target = $(dir $@).$(notdir $@)
+
+###
+# filename of target with directory and extension stripped
+basetarget = $(basename $(notdir $@))
+
+###
+# The temporary file to save gcc -MD generated dependencies must not
+# contain a comma
+depfile = $(subst $(comma),_,$(dot-target).d)
+
+###
+# Check if both arguments has same arguments. Result is empty string if equal.
+arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
+                    $(filter-out $(cmd_$@),   $(cmd_$(1))) )
+
+###
+# Escape single quote for use in echo statements
+escsq = $(subst $(squote),'\$(squote)',$1)
+
+# Echo command
+# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
+echo-cmd = $(if $($(quiet)cmd_$(1)),\
+           echo '  $(call escsq,$($(quiet)cmd_$(1)))';)
+
+###
+# Replace >$< with >$$< to preserve $ when reloading the .cmd file
+# (needed for make)
+# Replace >#< with >\#< to avoid starting a comment in the .cmd file
+# (needed for make)
+# Replace >'< with >'\''< to be able to enclose the whole string in '...'
+# (needed for the shell)
+make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
+
+###
+# Find any prerequisites that is newer than target or that does not exist.
+# PHONY targets skipped in both cases.
+any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
+
+###
+# if_changed_dep  - execute command if any prerequisite is newer than
+#                   target, or command line has changed and update
+#                   dependencies in the cmd file
+if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)),         \
+	@set -e;                                                   \
+	$(echo-cmd) $(cmd_$(1));                                   \
+	cat $(depfile) > $(dot-target).cmd;                        \
+	printf '%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd)
+
+# if_changed      - execute command if any prerequisite is newer than
+#                   target, or command line has changed
+if_changed = $(if $(strip $(any-prereq) $(arg-check)),             \
+	@set -e;                                                   \
+	$(echo-cmd) $(cmd_$(1));                                   \
+	printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
+
+###
+# C flags to be used in rule definitions, includes:
+# - depfile generation
+# - global $(CFLAGS)
+# - per target C flags
+# - per object C flags
+# - BUILD_STR macro to allow '-D"$(variable)"' constructs
+c_flags = -Wp,-MD,$(depfile),-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj))

tools/build/Documentation/Build.txt

+Build Framework
+===============
+
+The perf build framework was adopted from the kernel build system, hence the
+idea and the way how objects are built is the same.
+
+Basically the user provides set of 'Build' files that list objects and
+directories to nest for specific target to be build.
+
+Unlike the kernel we don't have a single build object 'obj-y' list that where
+we setup source objects, but we support more. This allows one 'Build' file to
+carry a sources list for multiple build objects.
+
+a) Build framework makefiles
+----------------------------
+
+The build framework consists of 2 Makefiles:
+
+  Build.include
+  Makefile.build
+
+While the 'Build.include' file contains just some generic definitions, the
+'Makefile.build' file is the makefile used from the outside. It's
+interface/usage is following:
+
+  $ make -f tools/build/Makefile srctree=$(KSRC) dir=$(DIR) obj=$(OBJECT)
+
+where:
+
+  KSRC   - is the path to kernel sources
+  DIR    - is the path to the project to be built
+  OBJECT - is the name of the build object
+
+When succefully finished the $(DIR) directory contains the final object file
+called $(OBJECT)-in.o:
+
+  $ ls $(DIR)/$(OBJECT)-in.o
+
+which includes all compiled sources described in 'Build' makefiles.
+
+a) Build makefiles
+------------------
+
+The user supplies 'Build' makefiles that contains a objects list, and connects
+the build to nested directories.
+
+Assume we have the following project structure:
+
+  ex/a.c
+    /b.c
+    /c.c
+    /d.c
+    /arch/e.c
+    /arch/f.c
+
+Out of which you build the 'ex' binary ' and the 'libex.a' library:
+
+  'ex'      - consists of 'a.o', 'b.o' and libex.a
+  'libex.a' - consists of 'c.o', 'd.o', 'e.o' and 'f.o'
+
+The build framework does not create the 'ex' and 'libex.a' binaries for you, it
+only prepares proper objects to be compiled and grouped together.
+
+To follow the above example, the user provides following 'Build' files:
+
+  ex/Build:
+    ex-y += a.o
+    ex-y += b.o
+
+    libex-y += c.o
+    libex-y += d.o
+    libex-y += arch/
+
+  ex/arch/Build:
+    libex-y += e.o
+    libex-y += f.o
+
+and runs:
+
+  $ make -f tools/build/Makefile.build dir=. obj=ex
+  $ make -f tools/build/Makefile.build dir=. obj=libex
+
+which creates the following objects:
+
+  ex/ex-in.o
+  ex/libex-in.o
+
+that contain request objects names in Build files.
+
+It's only a matter of 2 single commands to create the final binaries:
+
+  $ ar  rcs libex.a libex-in.o
+  $ gcc -o ex ex-in.o libex.a
+
+You can check the 'ex' example in 'tools/build/tests/ex' for more details.
+
+b) Rules
+--------
+
+The build framework provides standard compilation rules to handle .S and .c
+compilation.
+
+It's possible to include special rule if needed (like we do for flex or bison
+code generation).
+
+c) CFLAGS
+---------
+
+It's possible to alter the standard object C flags in the following way:
+
+  CFLAGS_perf.o += '...' - alters CFLAGS for perf.o object
+  CFLAGS_gtk += '...'    - alters CFLAGS for gtk build object
+
+This C flags changes has the scope of the Build makefile they are defined in.
+
+
+d) Dependencies
+---------------
+
+For each built object file 'a.o' the '.a.cmd' is created and holds:
+
+  - Command line used to built that object
+    (for each object)
+
+  - Dependency rules generated by 'gcc -Wp,-MD,...'
+    (for compiled object)
+
+All existing '.cmd' files are included in the Build process to follow properly
+the dependencies and trigger a rebuild when necessary.
+
+
+e) Single rules
+---------------
+
+It's possible to build single object file by choice, like:
+
+  $ make util/map.o    # objects
+  $ make util/map.i    # preprocessor
+  $ make util/map.s    # assembly

tools/build/Makefile.build

+###
+# Main build makefile.
+#
+#  Lots of this code have been borrowed or heavily inspired from parts
+#  of kbuild code, which is not credited, but mostly developed by:
+#
+#  Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
+#  Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
+#
+
+PHONY := __build
+__build:
+
+ifeq ($(V),1)
+  quiet =
+  Q =
+else
+  quiet=quiet_
+  Q=@
+endif
+
+build-dir := $(srctree)/tools/build
+
+# Generic definitions
+include $(build-dir)/Build.include
+
+# do not force detected configuration
+-include .config-detected
+
+# Init all relevant variables used in build files so
+# 1) they have correct type
+# 2) they do not inherit any value from the environment
+subdir-y     :=
+obj-y        :=
+subdir-y     :=
+subdir-obj-y :=
+
+# Build definitions
+build-file := $(dir)/Build
+include $(build-file)
+
+quiet_cmd_flex  = FLEX     $@
+quiet_cmd_bison = BISON    $@
+
+# Create directory unless it exists
+quiet_cmd_mkdir = MKDIR    $(dir $@)
+      cmd_mkdir = mkdir -p $(dir $@)
+     rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir))
+
+# Compile command
+quiet_cmd_cc_o_c = CC       $@
+      cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
+
+quiet_cmd_cc_i_c = CPP      $@
+      cmd_cc_i_c = $(CC) $(c_flags) -E -o $@ $<
+
+quiet_cmd_cc_s_c = AS       $@
+      cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
+
+# Link agregate command
+# If there's nothing to link, create empty $@ object.
+quiet_cmd_ld_multi = LD       $@
+      cmd_ld_multi = $(if $(strip $(obj-y)),\
+		       $(LD) -r -o $@ $(obj-y),rm -f $@; $(AR) rcs $@)
+
+# Build rules
+$(OUTPUT)%.o: %.c FORCE
+	$(call rule_mkdir)
+	$(call if_changed_dep,cc_o_c)
+
+$(OUTPUT)%.o: %.S FORCE
+	$(call rule_mkdir)
+	$(call if_changed_dep,cc_o_c)
+
+$(OUTPUT)%.i: %.c FORCE
+	$(call rule_mkdir)
+	$(call if_changed_dep,cc_i_c)
+
+$(OUTPUT)%.i: %.S FORCE
+	$(call rule_mkdir)
+	$(call if_changed_dep,cc_i_c)
+
+$(OUTPUT)%.s: %.c FORCE
+	$(call rule_mkdir)
+	$(call if_changed_dep,cc_s_c)
+
+# Gather build data:
+#   obj-y        - list of build objects
+#   subdir-y     - list of directories to nest
+#   subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
+obj-y        := $($(obj)-y)
+subdir-y     := $(patsubst %/,%,$(filter %/, $(obj-y)))
+obj-y        := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
+subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))
+
+# '$(OUTPUT)/dir' prefix to all objects
+prefix       := $(subst ./,,$(OUTPUT)$(dir)/)
+obj-y        := $(addprefix $(prefix),$(obj-y))
+subdir-obj-y := $(addprefix $(prefix),$(subdir-obj-y))
+
+# Final '$(obj)-in.o' object
+in-target := $(prefix)$(obj)-in.o
+
+PHONY += $(subdir-y)
+
+$(subdir-y):
+	$(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)
+
+$(sort $(subdir-obj-y)): $(subdir-y) ;
+
+$(in-target): $(obj-y) FORCE
+	$(call rule_mkdir)
+	$(call if_changed,ld_multi)
+
+__build: $(in-target)
+	@:
+
+PHONY += FORCE
+FORCE:
+
+# Include all cmd files to get all the dependency rules
+# for all objects included
+targets   := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS)))
+cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
+
+ifneq ($(cmd_files),)
+  include $(cmd_files)
+endif
+
+.PHONY: $(PHONY)

tools/build/Makefile.feature

+feature_dir := $(srctree)/tools/build/feature
+
+ifneq ($(OUTPUT),)
+  OUTPUT_FEATURES = $(OUTPUT)feature/
+  $(shell mkdir -p $(OUTPUT_FEATURES))
+endif
+
+feature_check = $(eval $(feature_check_code))
+define feature_check_code
+  feature-$(1) := $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS) $(FEATURE_CHECK_CFLAGS-$(1))" LDFLAGS="$(LDFLAGS) $(FEATURE_CHECK_LDFLAGS-$(1))" -C $(feature_dir) test-$1.bin >/dev/null 2>/dev/null && echo 1 || echo 0)
+endef
+
+feature_set = $(eval $(feature_set_code))
+define feature_set_code
+  feature-$(1) := 1
+endef
+
+#
+# Build the feature check binaries in parallel, ignore errors, ignore return value and suppress output:
+#
+
+#
+# Note that this is not a complete list of all feature tests, just
+# those that are typically built on a fully configured system.
+#
+# [ Feature tests not mentioned here have to be built explicitly in
+#   the rule that uses them - an example for that is the 'bionic'
+#   feature check. ]
+#
+FEATURE_TESTS =			\
+	backtrace			\
+	dwarf				\
+	fortify-source			\
+	sync-compare-and-swap		\
+	glibc				\
+	gtk2				\
+	gtk2-infobar			\
+	libaudit			\
+	libbfd				\
+	libelf				\
+	libelf-getphdrnum		\
+	libelf-mmap			\
+	libnuma				\
+	libperl				\
+	libpython			\
+	libpython-version		\
+	libslang			\
+	libunwind			\
+	pthread-attr-setaffinity-np	\
+	stackprotector-all		\
+	timerfd				\
+	libdw-dwarf-unwind		\
+	zlib				\
+	lzma
+
+FEATURE_DISPLAY =			\
+	dwarf				\
+	glibc				\
+	gtk2				\
+	libaudit			\
+	libbfd				\
+	libelf				\
+	libnuma				\
+	libperl				\
+	libpython			\
+	libslang			\
+	libunwind			\
+	libdw-dwarf-unwind		\
+	zlib				\
+	lzma
+
+# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
+# If in the future we need per-feature checks/flags for features not
+# mentioned in this list we need to refactor this ;-).
+set_test_all_flags = $(eval $(set_test_all_flags_code))
+define set_test_all_flags_code
+  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
+  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
+endef
+
+$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
+
+#
+# Special fast-path for the 'all features are available' case:
+#
+$(call feature_check,all,$(MSG))
+
+#
+# Just in case the build freshly failed, make sure we print the
+# feature matrix:
+#
+ifeq ($(feature-all), 1)
+  #
+  # test-all.c passed - just set all the core feature flags to 1:
+  #
+  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
+else
+  $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS)" LDFLAGS=$(LDFLAGS) -i -j -C $(feature_dir) $(addsuffix .bin,$(FEATURE_TESTS)) >/dev/null 2>&1)
+  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
+endif
+
+#
+# Print the result of the feature test:
+#
+feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
+
+define feature_print_status_code
+  ifeq ($(feature-$(1)), 1)
+    MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
+  else
+    MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
+  endif
+endef
+
+feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
+define feature_print_text_code
+    MSG = $(shell printf '...%30s: %s' $(1) $(2))
+endef
+
+FEATURE_DUMP := $(foreach feat,$(FEATURE_DISPLAY),feature-$(feat)($(feature-$(feat))))
+FEATURE_DUMP_FILE := $(shell touch $(OUTPUT)FEATURE-DUMP; cat $(OUTPUT)FEATURE-DUMP)
+
+ifeq ($(dwarf-post-unwind),1)
+  FEATURE_DUMP += dwarf-post-unwind($(dwarf-post-unwind-text))
+endif
+
+# The $(feature_display) controls the default detection message
+# output. It's set if:
+# - detected features differes from stored features from
+#   last build (in FEATURE-DUMP file)
+# - one of the $(FEATURE_DISPLAY) is not detected
+# - VF is enabled
+
+ifneq ("$(FEATURE_DUMP)","$(FEATURE_DUMP_FILE)")
+  $(shell echo "$(FEATURE_DUMP)" > $(OUTPUT)FEATURE-DUMP)
+  feature_display := 1
+endif
+
+feature_display_check = $(eval $(feature_check_code))
+define feature_display_check_code
+  ifneq ($(feature-$(1)), 1)
+    feature_display := 1
+  endif
+endef
+
+$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
+
+ifeq ($(VF),1)
+  feature_display := 1
+  feature_verbose := 1
+endif
+
+ifeq ($(feature_display),1)
+  $(info )
+  $(info Auto-detecting system features:)
+  $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
+
+  ifeq ($(dwarf-post-unwind),1)
+    $(call feature_print_text,"DWARF post unwind library", $(dwarf-post-unwind-text))
+  endif
+
+  ifneq ($(feature_verbose),1)
+    $(info )
+  endif
+endif
+
+ifeq ($(feature_verbose),1)
+  TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
+  $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
+  $(info )
+endif

tools/perf/config/feature-checks/.gitignore → tools/build/feature/.gitignore

 *.d
 *.bin
+*.output

tools/perf/config/feature-checks/Makefile → tools/build/feature/Makefile

@@ -29,33 +29,36 @@ FILES=					\
 	test-stackprotector-all.bin	\
 	test-timerfd.bin		\
 	test-libdw-dwarf-unwind.bin	\
+	test-libbabeltrace.bin		\
 	test-compile-32.bin		\
 	test-compile-x32.bin		\
-	test-zlib.bin
+	test-zlib.bin			\
+	test-lzma.bin
 
 CC := $(CROSS_COMPILE)gcc -MD
 PKG_CONFIG := $(CROSS_COMPILE)pkg-config
 
 all: $(FILES)
 
-BUILD = $(CC) $(CFLAGS) -o $(OUTPUT)$@ $(patsubst %.bin,%.c,$@) $(LDFLAGS)
+__BUILD = $(CC) $(CFLAGS) -Wall -Werror -o $(OUTPUT)$@ $(patsubst %.bin,%.c,$@) $(LDFLAGS)
+  BUILD = $(__BUILD) > $(OUTPUT)$(@:.bin=.make.output) 2>&1
 
 ###############################
 
 test-all.bin:
-	$(BUILD) -Werror -fstack-protector-all -O2 -Werror -D_FORTIFY_SOURCE=2 -ldw -lelf -lnuma -lelf -laudit -I/usr/include/slang -lslang $(shell $(PKG_CONFIG) --libs --cflags gtk+-2.0 2>/dev/null) $(FLAGS_PERL_EMBED) $(FLAGS_PYTHON_EMBED) -DPACKAGE='"perf"' -lbfd -ldl -lz
+	$(BUILD) -fstack-protector-all -O2 -D_FORTIFY_SOURCE=2 -ldw -lelf -lnuma -lelf -laudit -I/usr/include/slang -lslang $(shell $(PKG_CONFIG) --libs --cflags gtk+-2.0 2>/dev/null) $(FLAGS_PERL_EMBED) $(FLAGS_PYTHON_EMBED) -DPACKAGE='"perf"' -lbfd -ldl -lz -llzma
 
 test-hello.bin:
 	$(BUILD)
 
 test-pthread-attr-setaffinity-np.bin:
-	$(BUILD) -D_GNU_SOURCE -Werror -lpthread
+	$(BUILD) -D_GNU_SOURCE -lpthread
 
 test-stackprotector-all.bin:
-	$(BUILD) -Werror -fstack-protector-all
+	$(BUILD) -fstack-protector-all
 
 test-fortify-source.bin:
-	$(BUILD) -O2 -Werror -D_FORTIFY_SOURCE=2
+	$(BUILD) -O2 -D_FORTIFY_SOURCE=2
 
 test-bionic.bin:
 	$(BUILD)
@@ -118,10 +121,10 @@ test-libbfd.bin:
 	$(BUILD) -DPACKAGE='"perf"' -lbfd -lz -liberty -ldl
 
 test-liberty.bin:
-	$(CC) -o $(OUTPUT)$@ test-libbfd.c -DPACKAGE='"perf"' -lbfd -ldl -liberty
+	$(CC) -Wall -Werror -o $(OUTPUT)$@ test-libbfd.c -DPACKAGE='"perf"' -lbfd -ldl -liberty
 
 test-liberty-z.bin:
-	$(CC) -o $(OUTPUT)$@ test-libbfd.c -DPACKAGE='"perf"' -lbfd -ldl -liberty -lz
+	$(CC) -Wall -Werror -o $(OUTPUT)$@ test-libbfd.c -DPACKAGE='"perf"' -lbfd -ldl -liberty -lz
 
 test-cplus-demangle.bin:
 	$(BUILD) -liberty
@@ -133,10 +136,13 @@ test-timerfd.bin:
 	$(BUILD)
 
 test-libdw-dwarf-unwind.bin:
-	$(BUILD)
+	$(BUILD) # -ldw provided by $(FEATURE_CHECK_LDFLAGS-libdw-dwarf-unwind)
+
+test-libbabeltrace.bin:
+	$(BUILD) # -lbabeltrace provided by $(FEATURE_CHECK_LDFLAGS-libbabeltrace)
 
 test-sync-compare-and-swap.bin:
-	$(BUILD) -Werror
+	$(BUILD)
 
 test-compile-32.bin:
 	$(CC) -m32 -o $(OUTPUT)$@ test-compile.c
@@ -147,9 +153,12 @@ test-compile-x32.bin:
 test-zlib.bin:
 	$(BUILD) -lz
 
+test-lzma.bin:
+	$(BUILD) -llzma
+
 -include *.d
 
 ###############################
 
 clean:
-	rm -f $(FILES) *.d
+	rm -f $(FILES) *.d $(FILES:.bin=.make.output)

tools/perf/config/feature-checks/test-all.c → tools/build/feature/test-all.c

@@ -98,7 +98,23 @@
 #undef main
 
 #define main main_test_pthread_attr_setaffinity_np
-# include "test-pthread_attr_setaffinity_np.c"
+# include "test-pthread-attr-setaffinity-np.c"
+#undef main
+
+# if 0
+/*
+ * Disable libbabeltrace check for test-all, because the requested
+ * library version is not released yet in most distributions. Will
+ * reenable later.
+ */
+
+#define main main_test_libbabeltrace
+# include "test-libbabeltrace.c"
+#undef main
+#endif
+
+#define main main_test_lzma
+# include "test-lzma.c"
 #undef main
 
 int main(int argc, char *argv[])
@@ -126,6 +142,7 @@ int main(int argc, char *argv[])
 	main_test_sync_compare_and_swap(argc, argv);
 	main_test_zlib();
 	main_test_pthread_attr_setaffinity_np();
+	main_test_lzma();
 
 	return 0;
 }

tools/build/feature/test-libbabeltrace.c

+
+#include <babeltrace/ctf-writer/writer.h>
+#include <babeltrace/ctf-ir/stream-class.h>
+
+int main(void)
+{
+	bt_ctf_stream_class_get_packet_context_type((void *) 0);
+	return 0;
+}

tools/build/feature/test-lzma.c

+#include <lzma.h>
+
+int main(void)
+{
+	lzma_stream strm = LZMA_STREAM_INIT;
+	int ret;
+
+	ret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
+	return ret ? -1 : 0;
+}

tools/perf/config/feature-checks/test-pthread-attr-setaffinity-np.c → tools/build/feature/test-pthread-attr-setaffinity-np.c

 #include <stdint.h>
 #include <pthread.h>
+#include <sched.h>
 
 int main(void)
 {
@@ -8,7 +9,8 @@ int main(void)
 	cpu_set_t cs;
 
 	pthread_attr_init(&thread_attr);
-	/* don't care abt exact args, just the API itself in libpthread */
+	CPU_ZERO(&cs);
+
 	ret = pthread_attr_setaffinity_np(&thread_attr, sizeof(cs), &cs);
 
 	return ret;

tools/build/tests/ex/Build

+ex-y += ex.o
+ex-y += a.o
+ex-y += b.o
+ex-y += empty/
+
+libex-y += c.o
+libex-y += d.o
+libex-y += arch/

tools/build/tests/ex/Makefile

+export srctree := ../../../..
+export CC      := gcc
+export LD      := ld
+export AR      := ar
+
+build := -f $(srctree)/tools/build/Makefile.build dir=. obj
+ex: ex-in.o libex-in.o
+	gcc -o $@ $^
+
+ex.%: FORCE
+	make -f $(srctree)/tools/build/Makefile.build dir=. $@
+
+ex-in.o: FORCE
+	make $(build)=ex
+
+libex-in.o: FORCE
+	make $(build)=libex
+
+clean:
+	find . -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
+	rm -f ex ex.i ex.s
+
+.PHONY: FORCE

tools/build/tests/ex/a.c

+
+int a(void)
+{
+	return 0;
+}

tools/build/tests/ex/arch/Build

+libex-y += e.o
+libex-y += f.o

tools/build/tests/ex/arch/e.c

+
+int e(void)
+{
+	return 0;
+}

tools/build/tests/ex/arch/f.c

+
+int f(void)
+{
+	return 0;
+}

tools/build/tests/ex/b.c

+
+int b(void)
+{
+	return 0;
+}

tools/build/tests/ex/c.c

+
+int c(void)
+{
+	return 0;
+}

tools/build/tests/ex/d.c

+
+int d(void)
+{
+	return 0;
+}

tools/build/tests/ex/ex.c

+
+int a(void);
+int b(void);
+int c(void);
+int d(void);
+int e(void);
+int f(void);
+
+int main(void)
+{
+	a();
+	b();
+	c();
+	d();
+	e();
+	f();
+
+	return 0;
+}

tools/build/tests/run.sh

+#!/bin/sh
+
+function test_ex {
+	make -C ex V=1 clean > ex.out 2>&1
+	make -C ex V=1 >> ex.out 2>&1
+
+	if [ ! -x ./ex/ex ]; then
+	  echo FAILED
+	  exit -1
+	fi
+
+	make -C ex V=1 clean > /dev/null 2>&1
+	rm -f ex.out
+}
+
+function test_ex_suffix {
+	make -C ex V=1 clean > ex.out 2>&1
+
+	# use -rR to disable make's builtin rules
+	make -rR -C ex V=1 ex.o >> ex.out 2>&1
+	make -rR -C ex V=1 ex.i >> ex.out 2>&1
+	make -rR -C ex V=1 ex.s >> ex.out 2>&1
+
+	if [ -x ./ex/ex ]; then
+	  echo FAILED
+	  exit -1
+	fi
+
+	if [ ! -f ./ex/ex.o -o ! -f ./ex/ex.i -o ! -f ./ex/ex.s ]; then
+	  echo FAILED
+	  exit -1
+	fi
+
+	make -C ex V=1 clean > /dev/null 2>&1
+	rm -f ex.out
+}
+echo -n Testing..
+
+test_ex
+test_ex_suffix
+
+echo OK

tools/lib/api/Build

+libapi-y += fd/
+libapi-y += fs/

tools/lib/api/Makefile

 include ../../scripts/Makefile.include
 include ../../perf/config/utilities.mak		# QUIET_CLEAN
 
+ifeq ($(srctree),)
+srctree := $(patsubst %/,%,$(dir $(shell pwd)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+#$(info Determined 'srctree' to be $(srctree))
+endif
+
 CC = $(CROSS_COMPILE)gcc
 AR = $(CROSS_COMPILE)ar
 
-# guard against environment variables
-LIB_H=
-LIB_OBJS=
-
-LIB_H += fs/debugfs.h
-LIB_H += fs/fs.h
-# See comment below about piggybacking...
-LIB_H += fd/array.h
-
-LIB_OBJS += $(OUTPUT)fs/debugfs.o
-LIB_OBJS += $(OUTPUT)fs/fs.o
-# XXX piggybacking here, need to introduce libapikfd, or rename this
-# to plain libapik.a and make it have it all api goodies
-LIB_OBJS += $(OUTPUT)fd/array.o
+MAKEFLAGS += --no-print-directory
 
-LIBFILE = libapikfs.a
+LIBFILE = $(OUTPUT)libapi.a
 
-CFLAGS = -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -D_FORTIFY_SOURCE=2 $(EXTRA_WARNINGS) $(EXTRA_CFLAGS) -fPIC
-EXTLIBS = -lelf -lpthread -lrt -lm
-ALL_CFLAGS = $(CFLAGS) $(BASIC_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
-ALL_LDFLAGS = $(LDFLAGS)
+CFLAGS := $(EXTRA_WARNINGS) $(EXTRA_CFLAGS)
+CFLAGS += -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -D_FORTIFY_SOURCE=2 -fPIC
+CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
 
 RM = rm -f
 
-$(LIBFILE): $(LIB_OBJS)
-	$(QUIET_AR)$(RM) $@ && $(AR) rcs $(OUTPUT)$@ $(LIB_OBJS)
+build  := -f $(srctree)/tools/build/Makefile.build dir=. obj
+API_IN := $(OUTPUT)libapi-in.o
 
-$(LIB_OBJS): $(LIB_H)
+export srctree OUTPUT CC LD CFLAGS V
 
-libapi_dirs:
-	$(QUIET_MKDIR)mkdir -p $(OUTPUT)fd $(OUTPUT)fs
+all: $(LIBFILE)
 
-$(OUTPUT)%.o: %.c libapi_dirs
-	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) $<
-$(OUTPUT)%.s: %.c libapi_dirs
-	$(QUIET_CC)$(CC) -S $(ALL_CFLAGS) $<
-$(OUTPUT)%.o: %.S libapi_dirs
-	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) $<
+$(API_IN): FORCE
+	@$(MAKE) $(build)=libapi
+
+$(LIBFILE): $(API_IN)
+	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $(API_IN)
 
 clean:
-	$(call QUIET_CLEAN, libapi) $(RM) $(LIB_OBJS) $(LIBFILE)
+	$(call QUIET_CLEAN, libapi) $(RM) $(LIBFILE); \
+	find $(if $(OUTPUT),$(OUTPUT),.) -name \*.o | xargs $(RM)
+
+FORCE:
 
-.PHONY: clean
+.PHONY: clean FORCE

tools/lib/api/fd/Build

+libapi-y += array.o

tools/lib/api/fs/Build

+libapi-y += fs.o
+libapi-y += debugfs.o
+libapi-y += findfs.o
+libapi-y += tracefs.o

tools/lib/api/fs/debugfs.c

@@ -3,75 +3,50 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 #include <stdbool.h>
 #include <sys/vfs.h>
+#include <sys/types.h>
+#include <sys/stat.h>
 #include <sys/mount.h>
 #include <linux/kernel.h>
 
 #include "debugfs.h"
 
-char debugfs_mountpoint[PATH_MAX + 1] = "/sys/kernel/debug";
+#ifndef DEBUGFS_DEFAULT_PATH
+#define DEBUGFS_DEFAULT_PATH		"/sys/kernel/debug"
+#endif
+
+char debugfs_mountpoint[PATH_MAX + 1] = DEBUGFS_DEFAULT_PATH;
 
 static const char * const debugfs_known_mountpoints[] = {
-	"/sys/kernel/debug",
+	DEBUGFS_DEFAULT_PATH,
 	"/debug",
 	0,
 };
 
 static bool debugfs_found;
 
+bool debugfs_configured(void)
+{
+	return debugfs_find_mountpoint() != NULL;
+}
+
 /* find the path to the mounted debugfs */
 const char *debugfs_find_mountpoint(void)
 {
-	const char * const *ptr;
-	char type[100];
-	FILE *fp;
+	const char *ret;
 
 	if (debugfs_found)
 		return (const char *)debugfs_mountpoint;
 
-	ptr = debugfs_known_mountpoints;
-	while (*ptr) {
-		if (debugfs_valid_mountpoint(*ptr) == 0) {
-			debugfs_found = true;
-			strcpy(debugfs_mountpoint, *ptr);
-			return debugfs_mountpoint;
-		}
-		ptr++;
-	}
-
-	/* give up and parse /proc/mounts */
-	fp = fopen("/proc/mounts", "r");
-	if (fp == NULL)
-		return NULL;
-
-	while (fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
-		      debugfs_mountpoint, type) == 2) {
-		if (strcmp(type, "debugfs") == 0)
-			break;
-	}
-	fclose(fp);
+	ret = find_mountpoint("debugfs", (long) DEBUGFS_MAGIC,
+			      debugfs_mountpoint, PATH_MAX + 1,
+			      debugfs_known_mountpoints);
+	if (ret)
+		debugfs_found = true;
 
-	if (strcmp(type, "debugfs") != 0)
-		return NULL;
-
-	debugfs_found = true;
-
-	return debugfs_mountpoint;
-}
-
-/* verify that a mountpoint is actually a debugfs instance */
-
-int debugfs_valid_mountpoint(const char *debugfs)
-{
-	struct statfs st_fs;
-
-	if (statfs(debugfs, &st_fs) < 0)
-		return -ENOENT;
-	else if ((long)st_fs.f_type != (long)DEBUGFS_MAGIC)
-		return -ENOENT;
-
-	return 0;
+	return ret;
 }
 
 /* mount the debugfs somewhere if it's not mounted */
@@ -87,7 +62,7 @@ char *debugfs_mount(const char *mountpoint)
 		mountpoint = getenv(PERF_DEBUGFS_ENVIRONMENT);
 		/* if no environment variable, use default */
 		if (mountpoint == NULL)
-			mountpoint = "/sys/kernel/debug";
+			mountpoint = DEBUGFS_DEFAULT_PATH;
 	}
 
 	if (mount(NULL, mountpoint, "debugfs", 0, NULL) < 0)

tools/lib/api/fs/debugfs.h

 #ifndef __API_DEBUGFS_H__
 #define __API_DEBUGFS_H__
 
-#define _STR(x) #x
-#define STR(x) _STR(x)
-
-/*
- * On most systems <limits.h> would have given us this, but  not on some systems
- * (e.g. GNU/Hurd).
- */
-#ifndef PATH_MAX
-#define PATH_MAX 4096
-#endif
+#include "findfs.h"
 
 #ifndef DEBUGFS_MAGIC
 #define DEBUGFS_MAGIC          0x64626720
@@ -20,8 +11,8 @@
 #define PERF_DEBUGFS_ENVIRONMENT "PERF_DEBUGFS_DIR"
 #endif
 
+bool debugfs_configured(void);
 const char *debugfs_find_mountpoint(void);
-int debugfs_valid_mountpoint(const char *debugfs);
 char *debugfs_mount(const char *mountpoint);
 
 extern char debugfs_mountpoint[];

tools/lib/api/fs/findfs.c

+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <sys/vfs.h>
+
+#include "findfs.h"
+
+/* verify that a mountpoint is actually the type we want */
+
+int valid_mountpoint(const char *mount, long magic)
+{
+	struct statfs st_fs;
+
+	if (statfs(mount, &st_fs) < 0)
+		return -ENOENT;
+	else if ((long)st_fs.f_type != magic)
+		return -ENOENT;
+
+	return 0;
+}
+
+/* find the path to a mounted file system */
+const char *find_mountpoint(const char *fstype, long magic,
+			    char *mountpoint, int len,
+			    const char * const *known_mountpoints)
+{
+	const char * const *ptr;
+	char format[128];
+	char type[100];
+	FILE *fp;
+
+	if (known_mountpoints) {
+		ptr = known_mountpoints;
+		while (*ptr) {
+			if (valid_mountpoint(*ptr, magic) == 0) {
+				strncpy(mountpoint, *ptr, len - 1);
+				mountpoint[len-1] = 0;
+				return mountpoint;
+			}
+			ptr++;
+		}
+	}
+
+	/* give up and parse /proc/mounts */
+	fp = fopen("/proc/mounts", "r");
+	if (fp == NULL)
+		return NULL;
+
+	snprintf(format, 128, "%%*s %%%ds %%99s %%*s %%*d %%*d\n", len);
+
+	while (fscanf(fp, format, mountpoint, type) == 2) {
+		if (strcmp(type, fstype) == 0)
+			break;
+	}
+	fclose(fp);
+
+	if (strcmp(type, fstype) != 0)
+		return NULL;
+
+	return mountpoint;
+}

tools/lib/api/fs/findfs.h

+#ifndef __API_FINDFS_H__
+#define __API_FINDFS_H__
+
+#include <stdbool.h>
+
+#define _STR(x) #x
+#define STR(x) _STR(x)
+
+/*
+ * On most systems <limits.h> would have given us this, but  not on some systems
+ * (e.g. GNU/Hurd).
+ */
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
+const char *find_mountpoint(const char *fstype, long magic,
+			    char *mountpoint, int len,
+			    const char * const *known_mountpoints);
+
+int valid_mountpoint(const char *mount, long magic);
+
+#endif /* __API_FINDFS_H__ */

tools/lib/api/fs/tracefs.c

+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <sys/vfs.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mount.h>
+#include <linux/kernel.h>
+
+#include "tracefs.h"
+
+#ifndef TRACEFS_DEFAULT_PATH
+#define TRACEFS_DEFAULT_PATH		"/sys/kernel/tracing"
+#endif
+
+char tracefs_mountpoint[PATH_MAX + 1] = TRACEFS_DEFAULT_PATH;
+
+static const char * const tracefs_known_mountpoints[] = {
+	TRACEFS_DEFAULT_PATH,
+	"/sys/kernel/debug/tracing",
+	"/tracing",
+	"/trace",
+	0,
+};
+
+static bool tracefs_found;
+
+bool tracefs_configured(void)
+{
+	return tracefs_find_mountpoint() != NULL;
+}
+
+/* find the path to the mounted tracefs */
+const char *tracefs_find_mountpoint(void)
+{
+	const char *ret;
+
+	if (tracefs_found)
+		return (const char *)tracefs_mountpoint;
+
+	ret = find_mountpoint("tracefs", (long) TRACEFS_MAGIC,
+			      tracefs_mountpoint, PATH_MAX + 1,
+			      tracefs_known_mountpoints);
+
+	if (ret)
+		tracefs_found = true;
+
+	return ret;
+}
+
+/* mount the tracefs somewhere if it's not mounted */
+char *tracefs_mount(const char *mountpoint)
+{
+	/* see if it's already mounted */
+	if (tracefs_find_mountpoint())
+		goto out;
+
+	/* if not mounted and no argument */
+	if (mountpoint == NULL) {
+		/* see if environment variable set */
+		mountpoint = getenv(PERF_TRACEFS_ENVIRONMENT);
+		/* if no environment variable, use default */
+		if (mountpoint == NULL)
+			mountpoint = TRACEFS_DEFAULT_PATH;
+	}
+
+	if (mount(NULL, mountpoint, "tracefs", 0, NULL) < 0)
+		return NULL;
+
+	/* save the mountpoint */
+	tracefs_found = true;
+	strncpy(tracefs_mountpoint, mountpoint, sizeof(tracefs_mountpoint));
+out:
+	return tracefs_mountpoint;
+}

tools/lib/api/fs/tracefs.h

+#ifndef __API_TRACEFS_H__
+#define __API_TRACEFS_H__
+
+#include "findfs.h"
+
+#ifndef TRACEFS_MAGIC
+#define TRACEFS_MAGIC          0x74726163
+#endif
+
+#ifndef PERF_TRACEFS_ENVIRONMENT
+#define PERF_TRACEFS_ENVIRONMENT "PERF_TRACEFS_DIR"
+#endif
+
+bool tracefs_configured(void);
+const char *tracefs_find_mountpoint(void);
+int tracefs_valid_mountpoint(const char *debugfs);
+char *tracefs_mount(const char *mountpoint);
+
+extern char tracefs_mountpoint[];
+
+#endif /* __API_DEBUGFS_H__ */

tools/lib/lockdep/Build

+liblockdep-y += common.o lockdep.o preload.o rbtree.o

tools/lib/lockdep/Makefile

@@ -35,6 +35,10 @@ bindir = $(prefix)/$(bindir_relative)
 
 export DESTDIR DESTDIR_SQ INSTALL
 
+MAKEFLAGS += --no-print-directory
+
+include ../../scripts/Makefile.include
+
 # copy a bit from Linux kbuild
 
 ifeq ("$(origin V)", "command line")
@@ -44,56 +48,21 @@ ifndef VERBOSE
   VERBOSE = 0
 endif
 
-ifeq ("$(origin O)", "command line")
-  BUILD_OUTPUT := $(O)
+ifeq ($(srctree),)
+srctree := $(patsubst %/,%,$(dir $(shell pwd)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+#$(info Determined 'srctree' to be $(srctree))
 endif
 
-ifeq ($(BUILD_SRC),)
-ifneq ($(BUILD_OUTPUT),)
-
-define build_output
-	$(if $(VERBOSE:1=),@)$(MAKE) -C $(BUILD_OUTPUT)	\
-	BUILD_SRC=$(CURDIR) -f $(CURDIR)/Makefile $1
-endef
-
-saved-output := $(BUILD_OUTPUT)
-BUILD_OUTPUT := $(shell cd $(BUILD_OUTPUT) && /bin/pwd)
-$(if $(BUILD_OUTPUT),, \
-     $(error output directory "$(saved-output)" does not exist))
-
-all: sub-make
-
-gui: force
-	$(call build_output, all_cmd)
-
-$(filter-out gui,$(MAKECMDGOALS)): sub-make
-
-sub-make: force
-	$(call build_output, $(MAKECMDGOALS))
-
-
-# Leave processing to above invocation of make
-skip-makefile := 1
-
-endif # BUILD_OUTPUT
-endif # BUILD_SRC
-
-# We process the rest of the Makefile if this is the final invocation of make
-ifeq ($(skip-makefile),)
-
-srctree		:= $(realpath $(if $(BUILD_SRC),$(BUILD_SRC),$(CURDIR)))
-objtree		:= $(realpath $(CURDIR))
-src		:= $(srctree)
-obj		:= $(objtree)
-
-export prefix libdir bindir src obj
-
 # Shell quotes
 libdir_SQ = $(subst ','\'',$(libdir))
 bindir_SQ = $(subst ','\'',$(bindir))
 
-LIB_FILE = liblockdep.a liblockdep.so.$(LIBLOCKDEP_VERSION)
+LIB_IN := $(OUTPUT)liblockdep-in.o
+
 BIN_FILE = lockdep
+LIB_FILE = $(OUTPUT)liblockdep.a $(OUTPUT)liblockdep.so.$(LIBLOCKDEP_VERSION)
 
 CONFIG_INCLUDES =
 CONFIG_LIBS	=
@@ -108,33 +77,23 @@ INCLUDES = -I. -I./uinclude -I./include -I../../include $(CONFIG_INCLUDES)
 
 # Set compile option CFLAGS if not set elsewhere
 CFLAGS ?= -g -DCONFIG_LOCKDEP -DCONFIG_STACKTRACE -DCONFIG_PROVE_LOCKING -DBITS_PER_LONG=__WORDSIZE -DLIBLOCKDEP_VERSION='"$(LIBLOCKDEP_VERSION)"' -rdynamic -O0 -g
+CFLAGS += -fPIC
 
 override CFLAGS += $(CONFIG_FLAGS) $(INCLUDES) $(PLUGIN_DIR_SQ)
 
 ifeq ($(VERBOSE),1)
   Q =
-  print_compile =
-  print_app_build =
-  print_fpic_compile =
   print_shared_lib_compile =
   print_install =
 else
   Q = @
-  print_compile =		echo '  CC                 '$(OBJ);
-  print_app_build =		echo '  BUILD              '$(OBJ);
-  print_fpic_compile =		echo '  CC FPIC            '$(OBJ);
-  print_shared_lib_compile =	echo '  BUILD SHARED LIB   '$(OBJ);
-  print_static_lib_build =	echo '  BUILD STATIC LIB   '$(OBJ);
-  print_install =		echo '  INSTALL     '$1'	to	$(DESTDIR_SQ)$2';
+  print_shared_lib_compile =	echo '  LD       '$(OBJ);
+  print_static_lib_build =	echo '  LD       '$(OBJ);
+  print_install =		echo '  INSTALL  '$1'	to	$(DESTDIR_SQ)$2';
 endif
 
-do_fpic_compile =					\
-	($(print_fpic_compile)				\
-	$(CC) -c $(CFLAGS) $(EXT) -fPIC $< -o $@)
-
-do_app_build =						\
-	($(print_app_build)				\
-	$(CC) $^ -rdynamic -o $@ $(CONFIG_LIBS) $(LIBS))
+export srctree OUTPUT CC LD CFLAGS V
+build := -f $(srctree)/tools/build/Makefile.build dir=. obj
 
 do_compile_shared_library =			\
 	($(print_shared_lib_compile)		\
@@ -144,22 +103,6 @@ do_build_static_lib =				\
 	($(print_static_lib_build)		\
 	$(RM) $@;  $(AR) rcs $@ $^)
 
-
-define do_compile
-	$(print_compile)						\
-	$(CC) -c $(CFLAGS) $(EXT) $< -o $(obj)/$@;
-endef
-
-$(obj)/%.o: $(src)/%.c
-	$(Q)$(call do_compile)
-
-%.o: $(src)/%.c
-	$(Q)$(call do_compile)
-
-PEVENT_LIB_OBJS = common.o lockdep.o preload.o rbtree.o
-
-ALL_OBJS = $(PEVENT_LIB_OBJS)
-
 CMD_TARGETS = $(LIB_FILE)
 
 TARGETS = $(CMD_TARGETS)
@@ -169,42 +112,15 @@ all: all_cmd
 
 all_cmd: $(CMD_TARGETS)
 
-liblockdep.so.$(LIBLOCKDEP_VERSION): $(PEVENT_LIB_OBJS)
+$(LIB_IN): force
+	$(Q)$(MAKE) $(build)=liblockdep
+
+liblockdep.so.$(LIBLOCKDEP_VERSION): $(LIB_IN)
 	$(Q)$(do_compile_shared_library)
 
-liblockdep.a: $(PEVENT_LIB_OBJS)
+liblockdep.a: $(LIB_IN)
 	$(Q)$(do_build_static_lib)
 
-$(PEVENT_LIB_OBJS): %.o: $(src)/%.c
-	$(Q)$(do_fpic_compile)
-
-## make deps
-
-all_objs := $(sort $(ALL_OBJS))
-all_deps := $(all_objs:%.o=.%.d)
-
-# let .d file also depends on the source and header files
-define check_deps
-		@set -e; $(RM) $@; \
-		$(CC) -MM $(CFLAGS) $< > $@.$$$$; \
-		sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \
-		$(RM) $@.$$$$
-endef
-
-$(all_deps): .%.d: $(src)/%.c
-	$(Q)$(call check_deps)
-
-$(all_objs) : %.o : .%.d
-
-dep_includes := $(wildcard $(all_deps))
-
-ifneq ($(dep_includes),)
- include $(dep_includes)
-endif
-
-### Detect environment changes
-TRACK_CFLAGS = $(subst ','\'',$(CFLAGS)):$(ARCH):$(CROSS_COMPILE)
-
 tags:	force
 	$(RM) tags
 	find . -name '*.[ch]' | xargs ctags --extra=+f --c-kinds=+px \
@@ -233,8 +149,6 @@ clean:
 	$(RM) *.o *~ $(TARGETS) *.a *liblockdep*.so* $(VERSION_FILES) .*.d
 	$(RM) tags TAGS
 
-endif # skip-makefile
-
 PHONY += force
 force:
 

tools/lib/traceevent/Build

+libtraceevent-y += event-parse.o
+libtraceevent-y += event-plugin.o
+libtraceevent-y += trace-seq.o
+libtraceevent-y += parse-filter.o
+libtraceevent-y += parse-utils.o
+libtraceevent-y += kbuffer-parse.o
+
+plugin_jbd2-y         += plugin_jbd2.o
+plugin_hrtimer-y      += plugin_hrtimer.o
+plugin_kmem-y         += plugin_kmem.o
+plugin_kvm-y          += plugin_kvm.o
+plugin_mac80211-y     += plugin_mac80211.o
+plugin_sched_switch-y += plugin_sched_switch.o
+plugin_function-y     += plugin_function.o
+plugin_xen-y          += plugin_xen.o
+plugin_scsi-y         += plugin_scsi.o
+plugin_cfg80211-y     += plugin_cfg80211.o

tools/lib/traceevent/event-parse.h

@@ -22,6 +22,7 @@
 
 #include <stdbool.h>
 #include <stdarg.h>
+#include <stdio.h>
 #include <regex.h>
 #include <string.h>
 
@@ -91,6 +92,7 @@ extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
 
 extern void trace_seq_terminate(struct trace_seq *s);
 
+extern int trace_seq_do_fprintf(struct trace_seq *s, FILE *fp);
 extern int trace_seq_do_printf(struct trace_seq *s);
 
 
@@ -114,7 +116,7 @@ struct pevent_plugin_option {
 	char				*name;
 	char				*plugin_alias;
 	char				*description;
-	char				*value;
+	const char			*value;
 	void				*priv;
 	int				set;
 };
@@ -152,6 +154,10 @@ struct pevent_plugin_option {
  *   .plugin_alias is used to give a shorter name to access
  *   the vairable. Useful if a plugin handles more than one event.
  *
+ *   If .value is not set, then it is considered a boolean and only
+ *   .set will be processed. If .value is defined, then it is considered
+ *   a string option and .set will be ignored.
+ *
  * PEVENT_PLUGIN_ALIAS: (optional)
  *   The name to use for finding options (uses filename if not defined)
  */
@@ -245,6 +251,12 @@ struct print_arg_hex {
 	struct print_arg	*size;
 };
 
+struct print_arg_int_array {
+	struct print_arg	*field;
+	struct print_arg	*count;
+	struct print_arg	*el_size;
+};
+
 struct print_arg_dynarray {
 	struct format_field	*field;
 	struct print_arg	*index;
@@ -273,6 +285,7 @@ enum print_arg_type {
 	PRINT_FLAGS,
 	PRINT_SYMBOL,
 	PRINT_HEX,
+	PRINT_INT_ARRAY,
 	PRINT_TYPE,
 	PRINT_STRING,
 	PRINT_BSTRING,
@@ -292,6 +305,7 @@ struct print_arg {
 		struct print_arg_flags		flags;
 		struct print_arg_symbol		symbol;
 		struct print_arg_hex		hex;
+		struct print_arg_int_array	int_array;
 		struct print_arg_func		func;
 		struct print_arg_string		string;
 		struct print_arg_bitmask	bitmask;
@@ -597,7 +611,7 @@ enum trace_flag_type {
 };
 
 int pevent_register_comm(struct pevent *pevent, const char *comm, int pid);
-void pevent_register_trace_clock(struct pevent *pevent, char *trace_clock);
+int pevent_register_trace_clock(struct pevent *pevent, const char *trace_clock);
 int pevent_register_function(struct pevent *pevent, char *name,
 			     unsigned long long addr, char *mod);
 int pevent_register_print_string(struct pevent *pevent, const char *fmt,
@@ -617,6 +631,7 @@ enum pevent_errno pevent_parse_format(struct pevent *pevent,
 				      const char *buf,
 				      unsigned long size, const char *sys);
 void pevent_free_format(struct event_format *event);
+void pevent_free_format_field(struct format_field *field);
 
 void *pevent_get_field_raw(struct trace_seq *s, struct event_format *event,
 			   const char *name, struct pevent_record *record,
@@ -675,6 +690,11 @@ int pevent_data_type(struct pevent *pevent, struct pevent_record *rec);
 struct event_format *pevent_data_event_from_type(struct pevent *pevent, int type);
 int pevent_data_pid(struct pevent *pevent, struct pevent_record *rec);
 const char *pevent_data_comm_from_pid(struct pevent *pevent, int pid);
+struct cmdline;
+struct cmdline *pevent_data_pid_from_comm(struct pevent *pevent, const char *comm,
+					  struct cmdline *next);
+int pevent_cmdline_pid(struct pevent *pevent, struct cmdline *cmdline);
+
 void pevent_event_info(struct trace_seq *s, struct event_format *event,
 		       struct pevent_record *record);
 int pevent_strerror(struct pevent *pevent, enum pevent_errno errnum,

tools/lib/traceevent/kbuffer-parse.c

@@ -372,7 +372,6 @@ translate_data(struct kbuffer *kbuf, void *data, void **rptr,
 	switch (type_len) {
 	case KBUFFER_TYPE_PADDING:
 		*length = read_4(kbuf, data);
-		data += *length;
 		break;
 
 	case KBUFFER_TYPE_TIME_EXTEND:
@@ -730,3 +729,14 @@ void kbuffer_set_old_format(struct kbuffer *kbuf)
 
 	kbuf->next_event = __old_next_event;
 }
+
+/**
+ * kbuffer_start_of_data - return offset of where data starts on subbuffer
+ * @kbuf:	The kbuffer
+ *
+ * Returns the location on the subbuffer where the data starts.
+ */
+int kbuffer_start_of_data(struct kbuffer *kbuf)
+{
+	return kbuf->start;
+}

tools/lib/traceevent/kbuffer.h

@@ -63,5 +63,6 @@ int kbuffer_missed_events(struct kbuffer *kbuf);
 int kbuffer_subbuffer_size(struct kbuffer *kbuf);
 
 void kbuffer_set_old_format(struct kbuffer *kbuf);
+int kbuffer_start_of_data(struct kbuffer *kbuf);
 
 #endif /* _K_BUFFER_H */

tools/lib/traceevent/parse-filter.c

@@ -1058,6 +1058,7 @@ process_filter(struct event_format *event, struct filter_arg **parg,
 					*parg = current_op;
 				else
 					*parg = current_exp;
+				free(token);
 				return PEVENT_ERRNO__UNBALANCED_PAREN;
 			}
 			break;
@@ -1168,6 +1169,7 @@ process_filter(struct event_format *event, struct filter_arg **parg,
 
 	*parg = current_op;
 
+	free(token);
 	return 0;
 
  fail_alloc:

tools/lib/traceevent/trace-seq.c

@@ -231,19 +231,24 @@ void trace_seq_terminate(struct trace_seq *s)
 	s->buffer[s->len] = 0;
 }
 
-int trace_seq_do_printf(struct trace_seq *s)
+int trace_seq_do_fprintf(struct trace_seq *s, FILE *fp)
 {
 	TRACE_SEQ_CHECK(s);
 
 	switch (s->state) {
 	case TRACE_SEQ__GOOD:
-		return printf("%.*s", s->len, s->buffer);
+		return fprintf(fp, "%.*s", s->len, s->buffer);
 	case TRACE_SEQ__BUFFER_POISONED:
-		puts("Usage of trace_seq after it was destroyed");
+		fprintf(fp, "%s\n", "Usage of trace_seq after it was destroyed");
 		break;
 	case TRACE_SEQ__MEM_ALLOC_FAILED:
-		puts("Can't allocate trace_seq buffer memory");
+		fprintf(fp, "%s\n", "Can't allocate trace_seq buffer memory");
 		break;
 	}
 	return -1;
 }
+
+int trace_seq_do_printf(struct trace_seq *s)
+{
+	return trace_seq_do_fprintf(s, stdout);
+}

tools/perf/.gitignore

 PERF-CFLAGS
 PERF-GUI-VARS
 PERF-VERSION-FILE
+FEATURE-DUMP
 perf
 perf-read-vdso32
 perf-read-vdsox32

tools/perf/Documentation/perf-kmem.txt

@@ -25,6 +25,10 @@ OPTIONS
 --input=<file>::
 	Select the input file (default: perf.data unless stdin is a fifo)
 
+-v::
+--verbose::
+        Be more verbose. (show symbol address, etc)
+
 --caller::
 	Show per-callsite statistics