![Sukadev Bhattiprolu](/assets/img/avatar_default.png)
We currently use PERF_EVENT_TXN flag to determine if we are in the middle of a transaction. If in a transaction, we defer the schedulability checks from pmu->add() operation to the pmu->commit() operation. Now that we have "transaction types" (PERF_PMU_TXN_ADD, PERF_PMU_TXN_READ) we can use the type to determine if we are in a transaction and drop the PERF_EVENT_TXN flag. When PERF_EVENT_TXN is dropped, the cpuhw->group_flag on some architectures becomes unused, so drop that field as well. This is an extension of the Powerpc patch from Peter Zijlstra to s390, Sparc and x86 architectures. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Link: http://lkml.kernel.org/r/1441336073-22750-11-git-send-email-sukadev@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
1196 lines
33 KiB
C
1196 lines
33 KiB
C
/*
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* Performance events:
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*
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* Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
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* Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar
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* Copyright (C) 2008-2011, Red Hat, Inc., Peter Zijlstra
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*
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* Data type definitions, declarations, prototypes.
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*
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* Started by: Thomas Gleixner and Ingo Molnar
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*
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* For licencing details see kernel-base/COPYING
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*/
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#ifndef _LINUX_PERF_EVENT_H
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#define _LINUX_PERF_EVENT_H
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#include <uapi/linux/perf_event.h>
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/*
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* Kernel-internal data types and definitions:
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*/
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#ifdef CONFIG_PERF_EVENTS
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# include <asm/perf_event.h>
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# include <asm/local64.h>
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#endif
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struct perf_guest_info_callbacks {
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int (*is_in_guest)(void);
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int (*is_user_mode)(void);
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unsigned long (*get_guest_ip)(void);
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};
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#ifdef CONFIG_HAVE_HW_BREAKPOINT
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#include <asm/hw_breakpoint.h>
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#endif
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#include <linux/spinlock.h>
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#include <linux/hrtimer.h>
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#include <linux/fs.h>
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#include <linux/pid_namespace.h>
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#include <linux/workqueue.h>
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#include <linux/ftrace.h>
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#include <linux/cpu.h>
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#include <linux/irq_work.h>
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#include <linux/static_key.h>
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#include <linux/jump_label_ratelimit.h>
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#include <linux/atomic.h>
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#include <linux/sysfs.h>
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#include <linux/perf_regs.h>
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#include <linux/workqueue.h>
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#include <linux/cgroup.h>
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#include <asm/local.h>
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struct perf_callchain_entry {
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__u64 nr;
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__u64 ip[PERF_MAX_STACK_DEPTH];
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};
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struct perf_raw_record {
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u32 size;
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void *data;
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};
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/*
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* branch stack layout:
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* nr: number of taken branches stored in entries[]
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*
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* Note that nr can vary from sample to sample
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* branches (to, from) are stored from most recent
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* to least recent, i.e., entries[0] contains the most
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* recent branch.
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*/
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struct perf_branch_stack {
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__u64 nr;
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struct perf_branch_entry entries[0];
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};
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struct task_struct;
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/*
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* extra PMU register associated with an event
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*/
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struct hw_perf_event_extra {
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u64 config; /* register value */
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unsigned int reg; /* register address or index */
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int alloc; /* extra register already allocated */
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int idx; /* index in shared_regs->regs[] */
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};
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/**
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* struct hw_perf_event - performance event hardware details:
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*/
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struct hw_perf_event {
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#ifdef CONFIG_PERF_EVENTS
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union {
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struct { /* hardware */
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u64 config;
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u64 last_tag;
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unsigned long config_base;
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unsigned long event_base;
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int event_base_rdpmc;
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int idx;
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int last_cpu;
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int flags;
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struct hw_perf_event_extra extra_reg;
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struct hw_perf_event_extra branch_reg;
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};
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struct { /* software */
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struct hrtimer hrtimer;
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};
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struct { /* tracepoint */
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/* for tp_event->class */
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struct list_head tp_list;
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};
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struct { /* intel_cqm */
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int cqm_state;
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u32 cqm_rmid;
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struct list_head cqm_events_entry;
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struct list_head cqm_groups_entry;
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struct list_head cqm_group_entry;
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};
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struct { /* itrace */
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int itrace_started;
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};
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#ifdef CONFIG_HAVE_HW_BREAKPOINT
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struct { /* breakpoint */
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/*
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* Crufty hack to avoid the chicken and egg
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* problem hw_breakpoint has with context
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* creation and event initalization.
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*/
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struct arch_hw_breakpoint info;
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struct list_head bp_list;
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};
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#endif
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};
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/*
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* If the event is a per task event, this will point to the task in
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* question. See the comment in perf_event_alloc().
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*/
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struct task_struct *target;
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/*
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* hw_perf_event::state flags; used to track the PERF_EF_* state.
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*/
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#define PERF_HES_STOPPED 0x01 /* the counter is stopped */
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#define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
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#define PERF_HES_ARCH 0x04
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int state;
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/*
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* The last observed hardware counter value, updated with a
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* local64_cmpxchg() such that pmu::read() can be called nested.
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*/
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local64_t prev_count;
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/*
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* The period to start the next sample with.
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*/
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u64 sample_period;
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/*
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* The period we started this sample with.
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*/
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u64 last_period;
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/*
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* However much is left of the current period; note that this is
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* a full 64bit value and allows for generation of periods longer
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* than hardware might allow.
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*/
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local64_t period_left;
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/*
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* State for throttling the event, see __perf_event_overflow() and
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* perf_adjust_freq_unthr_context().
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*/
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u64 interrupts_seq;
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u64 interrupts;
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/*
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* State for freq target events, see __perf_event_overflow() and
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* perf_adjust_freq_unthr_context().
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*/
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u64 freq_time_stamp;
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u64 freq_count_stamp;
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#endif
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};
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struct perf_event;
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/*
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* Common implementation detail of pmu::{start,commit,cancel}_txn
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*/
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#define PERF_PMU_TXN_ADD 0x1 /* txn to add/schedule event on PMU */
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#define PERF_PMU_TXN_READ 0x2 /* txn to read event group from PMU */
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/**
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* pmu::capabilities flags
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*/
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#define PERF_PMU_CAP_NO_INTERRUPT 0x01
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#define PERF_PMU_CAP_NO_NMI 0x02
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#define PERF_PMU_CAP_AUX_NO_SG 0x04
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#define PERF_PMU_CAP_AUX_SW_DOUBLEBUF 0x08
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#define PERF_PMU_CAP_EXCLUSIVE 0x10
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#define PERF_PMU_CAP_ITRACE 0x20
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/**
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* struct pmu - generic performance monitoring unit
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*/
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struct pmu {
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struct list_head entry;
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struct module *module;
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struct device *dev;
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const struct attribute_group **attr_groups;
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const char *name;
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int type;
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/*
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* various common per-pmu feature flags
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*/
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int capabilities;
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int * __percpu pmu_disable_count;
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struct perf_cpu_context * __percpu pmu_cpu_context;
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atomic_t exclusive_cnt; /* < 0: cpu; > 0: tsk */
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int task_ctx_nr;
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int hrtimer_interval_ms;
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/*
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* Fully disable/enable this PMU, can be used to protect from the PMI
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* as well as for lazy/batch writing of the MSRs.
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*/
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void (*pmu_enable) (struct pmu *pmu); /* optional */
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void (*pmu_disable) (struct pmu *pmu); /* optional */
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/*
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* Try and initialize the event for this PMU.
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*
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* Returns:
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* -ENOENT -- @event is not for this PMU
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*
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* -ENODEV -- @event is for this PMU but PMU not present
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* -EBUSY -- @event is for this PMU but PMU temporarily unavailable
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* -EINVAL -- @event is for this PMU but @event is not valid
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* -EOPNOTSUPP -- @event is for this PMU, @event is valid, but not supported
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* -EACCESS -- @event is for this PMU, @event is valid, but no privilidges
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*
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* 0 -- @event is for this PMU and valid
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*
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* Other error return values are allowed.
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*/
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int (*event_init) (struct perf_event *event);
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/*
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* Notification that the event was mapped or unmapped. Called
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* in the context of the mapping task.
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*/
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void (*event_mapped) (struct perf_event *event); /*optional*/
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void (*event_unmapped) (struct perf_event *event); /*optional*/
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/*
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* Flags for ->add()/->del()/ ->start()/->stop(). There are
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* matching hw_perf_event::state flags.
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*/
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#define PERF_EF_START 0x01 /* start the counter when adding */
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#define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
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#define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
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/*
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* Adds/Removes a counter to/from the PMU, can be done inside a
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* transaction, see the ->*_txn() methods.
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*
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* The add/del callbacks will reserve all hardware resources required
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* to service the event, this includes any counter constraint
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* scheduling etc.
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*
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* Called with IRQs disabled and the PMU disabled on the CPU the event
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* is on.
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*
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* ->add() called without PERF_EF_START should result in the same state
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* as ->add() followed by ->stop().
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*
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* ->del() must always PERF_EF_UPDATE stop an event. If it calls
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* ->stop() that must deal with already being stopped without
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* PERF_EF_UPDATE.
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*/
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int (*add) (struct perf_event *event, int flags);
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void (*del) (struct perf_event *event, int flags);
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/*
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* Starts/Stops a counter present on the PMU.
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*
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* The PMI handler should stop the counter when perf_event_overflow()
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* returns !0. ->start() will be used to continue.
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*
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* Also used to change the sample period.
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*
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* Called with IRQs disabled and the PMU disabled on the CPU the event
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* is on -- will be called from NMI context with the PMU generates
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* NMIs.
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*
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* ->stop() with PERF_EF_UPDATE will read the counter and update
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* period/count values like ->read() would.
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*
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* ->start() with PERF_EF_RELOAD will reprogram the the counter
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* value, must be preceded by a ->stop() with PERF_EF_UPDATE.
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*/
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void (*start) (struct perf_event *event, int flags);
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void (*stop) (struct perf_event *event, int flags);
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/*
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* Updates the counter value of the event.
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*
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* For sampling capable PMUs this will also update the software period
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* hw_perf_event::period_left field.
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*/
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void (*read) (struct perf_event *event);
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/*
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* Group events scheduling is treated as a transaction, add
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* group events as a whole and perform one schedulability test.
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* If the test fails, roll back the whole group
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*
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* Start the transaction, after this ->add() doesn't need to
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* do schedulability tests.
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*
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* Optional.
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*/
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void (*start_txn) (struct pmu *pmu, unsigned int txn_flags);
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/*
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* If ->start_txn() disabled the ->add() schedulability test
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* then ->commit_txn() is required to perform one. On success
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* the transaction is closed. On error the transaction is kept
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* open until ->cancel_txn() is called.
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*
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* Optional.
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*/
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int (*commit_txn) (struct pmu *pmu);
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/*
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* Will cancel the transaction, assumes ->del() is called
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* for each successful ->add() during the transaction.
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*
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* Optional.
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*/
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void (*cancel_txn) (struct pmu *pmu);
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/*
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* Will return the value for perf_event_mmap_page::index for this event,
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* if no implementation is provided it will default to: event->hw.idx + 1.
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*/
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int (*event_idx) (struct perf_event *event); /*optional */
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/*
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* context-switches callback
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*/
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void (*sched_task) (struct perf_event_context *ctx,
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bool sched_in);
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/*
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* PMU specific data size
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*/
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size_t task_ctx_size;
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/*
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* Return the count value for a counter.
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*/
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u64 (*count) (struct perf_event *event); /*optional*/
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/*
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* Set up pmu-private data structures for an AUX area
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*/
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void *(*setup_aux) (int cpu, void **pages,
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int nr_pages, bool overwrite);
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/* optional */
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/*
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* Free pmu-private AUX data structures
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*/
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void (*free_aux) (void *aux); /* optional */
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/*
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* Filter events for PMU-specific reasons.
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*/
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int (*filter_match) (struct perf_event *event); /* optional */
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};
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/**
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* enum perf_event_active_state - the states of a event
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*/
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enum perf_event_active_state {
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PERF_EVENT_STATE_EXIT = -3,
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PERF_EVENT_STATE_ERROR = -2,
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PERF_EVENT_STATE_OFF = -1,
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PERF_EVENT_STATE_INACTIVE = 0,
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PERF_EVENT_STATE_ACTIVE = 1,
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};
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struct file;
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struct perf_sample_data;
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typedef void (*perf_overflow_handler_t)(struct perf_event *,
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struct perf_sample_data *,
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struct pt_regs *regs);
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enum perf_group_flag {
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PERF_GROUP_SOFTWARE = 0x1,
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};
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#define SWEVENT_HLIST_BITS 8
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#define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
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struct swevent_hlist {
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struct hlist_head heads[SWEVENT_HLIST_SIZE];
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struct rcu_head rcu_head;
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};
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#define PERF_ATTACH_CONTEXT 0x01
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#define PERF_ATTACH_GROUP 0x02
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#define PERF_ATTACH_TASK 0x04
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#define PERF_ATTACH_TASK_DATA 0x08
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struct perf_cgroup;
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struct ring_buffer;
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/**
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* struct perf_event - performance event kernel representation:
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*/
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struct perf_event {
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#ifdef CONFIG_PERF_EVENTS
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/*
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* entry onto perf_event_context::event_list;
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* modifications require ctx->lock
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* RCU safe iterations.
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*/
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struct list_head event_entry;
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/*
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* XXX: group_entry and sibling_list should be mutually exclusive;
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* either you're a sibling on a group, or you're the group leader.
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* Rework the code to always use the same list element.
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*
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* Locked for modification by both ctx->mutex and ctx->lock; holding
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* either sufficies for read.
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*/
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struct list_head group_entry;
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struct list_head sibling_list;
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/*
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* We need storage to track the entries in perf_pmu_migrate_context; we
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* cannot use the event_entry because of RCU and we want to keep the
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* group in tact which avoids us using the other two entries.
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*/
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struct list_head migrate_entry;
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struct hlist_node hlist_entry;
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struct list_head active_entry;
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int nr_siblings;
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int group_flags;
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struct perf_event *group_leader;
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struct pmu *pmu;
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enum perf_event_active_state state;
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unsigned int attach_state;
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local64_t count;
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atomic64_t child_count;
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/*
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* These are the total time in nanoseconds that the event
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* has been enabled (i.e. eligible to run, and the task has
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* been scheduled in, if this is a per-task event)
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* and running (scheduled onto the CPU), respectively.
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*
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* They are computed from tstamp_enabled, tstamp_running and
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* tstamp_stopped when the event is in INACTIVE or ACTIVE state.
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*/
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u64 total_time_enabled;
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u64 total_time_running;
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/*
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* These are timestamps used for computing total_time_enabled
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* and total_time_running when the event is in INACTIVE or
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* ACTIVE state, measured in nanoseconds from an arbitrary point
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* in time.
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* tstamp_enabled: the notional time when the event was enabled
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* tstamp_running: the notional time when the event was scheduled on
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* tstamp_stopped: in INACTIVE state, the notional time when the
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* event was scheduled off.
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*/
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u64 tstamp_enabled;
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u64 tstamp_running;
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u64 tstamp_stopped;
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/*
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* timestamp shadows the actual context timing but it can
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* be safely used in NMI interrupt context. It reflects the
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* context time as it was when the event was last scheduled in.
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*
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* ctx_time already accounts for ctx->timestamp. Therefore to
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|
* compute ctx_time for a sample, simply add perf_clock().
|
|
*/
|
|
u64 shadow_ctx_time;
|
|
|
|
struct perf_event_attr attr;
|
|
u16 header_size;
|
|
u16 id_header_size;
|
|
u16 read_size;
|
|
struct hw_perf_event hw;
|
|
|
|
struct perf_event_context *ctx;
|
|
atomic_long_t refcount;
|
|
|
|
/*
|
|
* These accumulate total time (in nanoseconds) that children
|
|
* events have been enabled and running, respectively.
|
|
*/
|
|
atomic64_t child_total_time_enabled;
|
|
atomic64_t child_total_time_running;
|
|
|
|
/*
|
|
* Protect attach/detach and child_list:
|
|
*/
|
|
struct mutex child_mutex;
|
|
struct list_head child_list;
|
|
struct perf_event *parent;
|
|
|
|
int oncpu;
|
|
int cpu;
|
|
|
|
struct list_head owner_entry;
|
|
struct task_struct *owner;
|
|
|
|
/* mmap bits */
|
|
struct mutex mmap_mutex;
|
|
atomic_t mmap_count;
|
|
|
|
struct ring_buffer *rb;
|
|
struct list_head rb_entry;
|
|
unsigned long rcu_batches;
|
|
int rcu_pending;
|
|
|
|
/* poll related */
|
|
wait_queue_head_t waitq;
|
|
struct fasync_struct *fasync;
|
|
|
|
/* delayed work for NMIs and such */
|
|
int pending_wakeup;
|
|
int pending_kill;
|
|
int pending_disable;
|
|
struct irq_work pending;
|
|
|
|
atomic_t event_limit;
|
|
|
|
void (*destroy)(struct perf_event *);
|
|
struct rcu_head rcu_head;
|
|
|
|
struct pid_namespace *ns;
|
|
u64 id;
|
|
|
|
u64 (*clock)(void);
|
|
perf_overflow_handler_t overflow_handler;
|
|
void *overflow_handler_context;
|
|
|
|
#ifdef CONFIG_EVENT_TRACING
|
|
struct trace_event_call *tp_event;
|
|
struct event_filter *filter;
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
struct ftrace_ops ftrace_ops;
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef CONFIG_CGROUP_PERF
|
|
struct perf_cgroup *cgrp; /* cgroup event is attach to */
|
|
int cgrp_defer_enabled;
|
|
#endif
|
|
|
|
#endif /* CONFIG_PERF_EVENTS */
|
|
};
|
|
|
|
/**
|
|
* struct perf_event_context - event context structure
|
|
*
|
|
* Used as a container for task events and CPU events as well:
|
|
*/
|
|
struct perf_event_context {
|
|
struct pmu *pmu;
|
|
/*
|
|
* Protect the states of the events in the list,
|
|
* nr_active, and the list:
|
|
*/
|
|
raw_spinlock_t lock;
|
|
/*
|
|
* Protect the list of events. Locking either mutex or lock
|
|
* is sufficient to ensure the list doesn't change; to change
|
|
* the list you need to lock both the mutex and the spinlock.
|
|
*/
|
|
struct mutex mutex;
|
|
|
|
struct list_head active_ctx_list;
|
|
struct list_head pinned_groups;
|
|
struct list_head flexible_groups;
|
|
struct list_head event_list;
|
|
int nr_events;
|
|
int nr_active;
|
|
int is_active;
|
|
int nr_stat;
|
|
int nr_freq;
|
|
int rotate_disable;
|
|
atomic_t refcount;
|
|
struct task_struct *task;
|
|
|
|
/*
|
|
* Context clock, runs when context enabled.
|
|
*/
|
|
u64 time;
|
|
u64 timestamp;
|
|
|
|
/*
|
|
* These fields let us detect when two contexts have both
|
|
* been cloned (inherited) from a common ancestor.
|
|
*/
|
|
struct perf_event_context *parent_ctx;
|
|
u64 parent_gen;
|
|
u64 generation;
|
|
int pin_count;
|
|
int nr_cgroups; /* cgroup evts */
|
|
void *task_ctx_data; /* pmu specific data */
|
|
struct rcu_head rcu_head;
|
|
|
|
struct delayed_work orphans_remove;
|
|
bool orphans_remove_sched;
|
|
};
|
|
|
|
/*
|
|
* Number of contexts where an event can trigger:
|
|
* task, softirq, hardirq, nmi.
|
|
*/
|
|
#define PERF_NR_CONTEXTS 4
|
|
|
|
/**
|
|
* struct perf_event_cpu_context - per cpu event context structure
|
|
*/
|
|
struct perf_cpu_context {
|
|
struct perf_event_context ctx;
|
|
struct perf_event_context *task_ctx;
|
|
int active_oncpu;
|
|
int exclusive;
|
|
|
|
raw_spinlock_t hrtimer_lock;
|
|
struct hrtimer hrtimer;
|
|
ktime_t hrtimer_interval;
|
|
unsigned int hrtimer_active;
|
|
|
|
struct pmu *unique_pmu;
|
|
struct perf_cgroup *cgrp;
|
|
};
|
|
|
|
struct perf_output_handle {
|
|
struct perf_event *event;
|
|
struct ring_buffer *rb;
|
|
unsigned long wakeup;
|
|
unsigned long size;
|
|
union {
|
|
void *addr;
|
|
unsigned long head;
|
|
};
|
|
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 void *perf_aux_output_begin(struct perf_output_handle *handle,
|
|
struct perf_event *event);
|
|
extern void perf_aux_output_end(struct perf_output_handle *handle,
|
|
unsigned long size, bool truncated);
|
|
extern int perf_aux_output_skip(struct perf_output_handle *handle,
|
|
unsigned long size);
|
|
extern void *perf_get_aux(struct perf_output_handle *handle);
|
|
|
|
extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
|
|
extern void perf_pmu_unregister(struct pmu *pmu);
|
|
|
|
extern int perf_num_counters(void);
|
|
extern const char *perf_pmu_name(void);
|
|
extern void __perf_event_task_sched_in(struct task_struct *prev,
|
|
struct task_struct *task);
|
|
extern void __perf_event_task_sched_out(struct task_struct *prev,
|
|
struct task_struct *next);
|
|
extern int perf_event_init_task(struct task_struct *child);
|
|
extern void perf_event_exit_task(struct task_struct *child);
|
|
extern void perf_event_free_task(struct task_struct *task);
|
|
extern void perf_event_delayed_put(struct task_struct *task);
|
|
extern struct perf_event *perf_event_get(unsigned int fd);
|
|
extern const struct perf_event_attr *perf_event_attrs(struct perf_event *event);
|
|
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);
|
|
extern void perf_event_update_userpage(struct perf_event *event);
|
|
extern int perf_event_release_kernel(struct perf_event *event);
|
|
extern struct perf_event *
|
|
perf_event_create_kernel_counter(struct perf_event_attr *attr,
|
|
int cpu,
|
|
struct task_struct *task,
|
|
perf_overflow_handler_t callback,
|
|
void *context);
|
|
extern void perf_pmu_migrate_context(struct pmu *pmu,
|
|
int src_cpu, int dst_cpu);
|
|
extern u64 perf_event_read_local(struct perf_event *event);
|
|
extern u64 perf_event_read_value(struct perf_event *event,
|
|
u64 *enabled, u64 *running);
|
|
|
|
|
|
struct perf_sample_data {
|
|
/*
|
|
* Fields set by perf_sample_data_init(), group so as to
|
|
* minimize the cachelines touched.
|
|
*/
|
|
u64 addr;
|
|
struct perf_raw_record *raw;
|
|
struct perf_branch_stack *br_stack;
|
|
u64 period;
|
|
u64 weight;
|
|
u64 txn;
|
|
union perf_mem_data_src data_src;
|
|
|
|
/*
|
|
* The other fields, optionally {set,used} by
|
|
* perf_{prepare,output}_sample().
|
|
*/
|
|
u64 type;
|
|
u64 ip;
|
|
struct {
|
|
u32 pid;
|
|
u32 tid;
|
|
} tid_entry;
|
|
u64 time;
|
|
u64 id;
|
|
u64 stream_id;
|
|
struct {
|
|
u32 cpu;
|
|
u32 reserved;
|
|
} cpu_entry;
|
|
struct perf_callchain_entry *callchain;
|
|
|
|
/*
|
|
* regs_user may point to task_pt_regs or to regs_user_copy, depending
|
|
* on arch details.
|
|
*/
|
|
struct perf_regs regs_user;
|
|
struct pt_regs regs_user_copy;
|
|
|
|
struct perf_regs regs_intr;
|
|
u64 stack_user_size;
|
|
} ____cacheline_aligned;
|
|
|
|
/* default value for data source */
|
|
#define PERF_MEM_NA (PERF_MEM_S(OP, NA) |\
|
|
PERF_MEM_S(LVL, NA) |\
|
|
PERF_MEM_S(SNOOP, NA) |\
|
|
PERF_MEM_S(LOCK, NA) |\
|
|
PERF_MEM_S(TLB, NA))
|
|
|
|
static inline void perf_sample_data_init(struct perf_sample_data *data,
|
|
u64 addr, u64 period)
|
|
{
|
|
/* remaining struct members initialized in perf_prepare_sample() */
|
|
data->addr = addr;
|
|
data->raw = NULL;
|
|
data->br_stack = NULL;
|
|
data->period = period;
|
|
data->weight = 0;
|
|
data->data_src.val = PERF_MEM_NA;
|
|
data->txn = 0;
|
|
}
|
|
|
|
extern void perf_output_sample(struct perf_output_handle *handle,
|
|
struct perf_event_header *header,
|
|
struct perf_sample_data *data,
|
|
struct perf_event *event);
|
|
extern void perf_prepare_sample(struct perf_event_header *header,
|
|
struct perf_sample_data *data,
|
|
struct perf_event *event,
|
|
struct pt_regs *regs);
|
|
|
|
extern int perf_event_overflow(struct perf_event *event,
|
|
struct perf_sample_data *data,
|
|
struct pt_regs *regs);
|
|
|
|
extern void perf_event_output(struct perf_event *event,
|
|
struct perf_sample_data *data,
|
|
struct pt_regs *regs);
|
|
|
|
extern void
|
|
perf_event_header__init_id(struct perf_event_header *header,
|
|
struct perf_sample_data *data,
|
|
struct perf_event *event);
|
|
extern void
|
|
perf_event__output_id_sample(struct perf_event *event,
|
|
struct perf_output_handle *handle,
|
|
struct perf_sample_data *sample);
|
|
|
|
extern void
|
|
perf_log_lost_samples(struct perf_event *event, u64 lost);
|
|
|
|
static inline bool is_sampling_event(struct perf_event *event)
|
|
{
|
|
return event->attr.sample_period != 0;
|
|
}
|
|
|
|
/*
|
|
* Return 1 for a software event, 0 for a hardware event
|
|
*/
|
|
static inline int is_software_event(struct perf_event *event)
|
|
{
|
|
return event->pmu->task_ctx_nr == perf_sw_context;
|
|
}
|
|
|
|
extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
|
|
|
|
extern void ___perf_sw_event(u32, u64, struct pt_regs *, u64);
|
|
extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
|
|
|
|
#ifndef perf_arch_fetch_caller_regs
|
|
static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
|
|
#endif
|
|
|
|
/*
|
|
* Take a snapshot of the regs. Skip ip and frame pointer to
|
|
* the nth caller. We only need a few of the regs:
|
|
* - ip for PERF_SAMPLE_IP
|
|
* - cs for user_mode() tests
|
|
* - bp for callchains
|
|
* - eflags, for future purposes, just in case
|
|
*/
|
|
static inline void perf_fetch_caller_regs(struct pt_regs *regs)
|
|
{
|
|
memset(regs, 0, sizeof(*regs));
|
|
|
|
perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
|
|
}
|
|
|
|
static __always_inline void
|
|
perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
|
|
{
|
|
if (static_key_false(&perf_swevent_enabled[event_id]))
|
|
__perf_sw_event(event_id, nr, regs, addr);
|
|
}
|
|
|
|
DECLARE_PER_CPU(struct pt_regs, __perf_regs[4]);
|
|
|
|
/*
|
|
* 'Special' version for the scheduler, it hard assumes no recursion,
|
|
* which is guaranteed by us not actually scheduling inside other swevents
|
|
* because those disable preemption.
|
|
*/
|
|
static __always_inline void
|
|
perf_sw_event_sched(u32 event_id, u64 nr, u64 addr)
|
|
{
|
|
if (static_key_false(&perf_swevent_enabled[event_id])) {
|
|
struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
|
|
|
|
perf_fetch_caller_regs(regs);
|
|
___perf_sw_event(event_id, nr, regs, addr);
|
|
}
|
|
}
|
|
|
|
extern struct static_key_deferred perf_sched_events;
|
|
|
|
static __always_inline bool
|
|
perf_sw_migrate_enabled(void)
|
|
{
|
|
if (static_key_false(&perf_swevent_enabled[PERF_COUNT_SW_CPU_MIGRATIONS]))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static inline void perf_event_task_migrate(struct task_struct *task)
|
|
{
|
|
if (perf_sw_migrate_enabled())
|
|
task->sched_migrated = 1;
|
|
}
|
|
|
|
static inline void perf_event_task_sched_in(struct task_struct *prev,
|
|
struct task_struct *task)
|
|
{
|
|
if (static_key_false(&perf_sched_events.key))
|
|
__perf_event_task_sched_in(prev, task);
|
|
|
|
if (perf_sw_migrate_enabled() && task->sched_migrated) {
|
|
struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
|
|
|
|
perf_fetch_caller_regs(regs);
|
|
___perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS, 1, regs, 0);
|
|
task->sched_migrated = 0;
|
|
}
|
|
}
|
|
|
|
static inline void perf_event_task_sched_out(struct task_struct *prev,
|
|
struct task_struct *next)
|
|
{
|
|
perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0);
|
|
|
|
if (static_key_false(&perf_sched_events.key))
|
|
__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);
|
|
extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
|
|
|
|
extern void perf_event_exec(void);
|
|
extern void perf_event_comm(struct task_struct *tsk, bool exec);
|
|
extern void perf_event_fork(struct task_struct *tsk);
|
|
|
|
/* Callchains */
|
|
DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
|
|
|
|
extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
|
|
extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
|
|
|
|
static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
|
|
{
|
|
if (entry->nr < PERF_MAX_STACK_DEPTH)
|
|
entry->ip[entry->nr++] = ip;
|
|
}
|
|
|
|
extern int sysctl_perf_event_paranoid;
|
|
extern int sysctl_perf_event_mlock;
|
|
extern int sysctl_perf_event_sample_rate;
|
|
extern int sysctl_perf_cpu_time_max_percent;
|
|
|
|
extern void perf_sample_event_took(u64 sample_len_ns);
|
|
|
|
extern int perf_proc_update_handler(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp,
|
|
loff_t *ppos);
|
|
extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp,
|
|
loff_t *ppos);
|
|
|
|
|
|
static inline bool perf_paranoid_tracepoint_raw(void)
|
|
{
|
|
return sysctl_perf_event_paranoid > -1;
|
|
}
|
|
|
|
static inline bool perf_paranoid_cpu(void)
|
|
{
|
|
return sysctl_perf_event_paranoid > 0;
|
|
}
|
|
|
|
static inline bool perf_paranoid_kernel(void)
|
|
{
|
|
return sysctl_perf_event_paranoid > 1;
|
|
}
|
|
|
|
extern void perf_event_init(void);
|
|
extern void perf_tp_event(u64 addr, u64 count, void *record,
|
|
int entry_size, struct pt_regs *regs,
|
|
struct hlist_head *head, int rctx,
|
|
struct task_struct *task);
|
|
extern void perf_bp_event(struct perf_event *event, void *data);
|
|
|
|
#ifndef perf_misc_flags
|
|
# define perf_misc_flags(regs) \
|
|
(user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
|
|
# define perf_instruction_pointer(regs) instruction_pointer(regs)
|
|
#endif
|
|
|
|
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;
|
|
}
|
|
|
|
static inline bool has_aux(struct perf_event *event)
|
|
{
|
|
return event->pmu->setup_aux;
|
|
}
|
|
|
|
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);
|
|
extern unsigned int perf_output_copy(struct perf_output_handle *handle,
|
|
const void *buf, unsigned int len);
|
|
extern unsigned int perf_output_skip(struct perf_output_handle *handle,
|
|
unsigned int len);
|
|
extern int perf_swevent_get_recursion_context(void);
|
|
extern void perf_swevent_put_recursion_context(int rctx);
|
|
extern u64 perf_swevent_set_period(struct perf_event *event);
|
|
extern void perf_event_enable(struct perf_event *event);
|
|
extern void perf_event_disable(struct perf_event *event);
|
|
extern int __perf_event_disable(void *info);
|
|
extern void perf_event_task_tick(void);
|
|
#else /* !CONFIG_PERF_EVENTS: */
|
|
static inline void *
|
|
perf_aux_output_begin(struct perf_output_handle *handle,
|
|
struct perf_event *event) { return NULL; }
|
|
static inline void
|
|
perf_aux_output_end(struct perf_output_handle *handle, unsigned long size,
|
|
bool truncated) { }
|
|
static inline int
|
|
perf_aux_output_skip(struct perf_output_handle *handle,
|
|
unsigned long size) { return -EINVAL; }
|
|
static inline void *
|
|
perf_get_aux(struct perf_output_handle *handle) { return NULL; }
|
|
static inline void
|
|
perf_event_task_migrate(struct task_struct *task) { }
|
|
static inline void
|
|
perf_event_task_sched_in(struct task_struct *prev,
|
|
struct task_struct *task) { }
|
|
static inline void
|
|
perf_event_task_sched_out(struct task_struct *prev,
|
|
struct task_struct *next) { }
|
|
static inline int perf_event_init_task(struct task_struct *child) { return 0; }
|
|
static inline void perf_event_exit_task(struct task_struct *child) { }
|
|
static inline void perf_event_free_task(struct task_struct *task) { }
|
|
static inline void perf_event_delayed_put(struct task_struct *task) { }
|
|
static inline struct perf_event *perf_event_get(unsigned int fd) { return ERR_PTR(-EINVAL); }
|
|
static inline const struct perf_event_attr *perf_event_attrs(struct perf_event *event)
|
|
{
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
static inline u64 perf_event_read_local(struct perf_event *event) { return -EINVAL; }
|
|
static inline void perf_event_print_debug(void) { }
|
|
static inline int perf_event_task_disable(void) { return -EINVAL; }
|
|
static inline int perf_event_task_enable(void) { return -EINVAL; }
|
|
static inline int perf_event_refresh(struct perf_event *event, int refresh)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline void
|
|
perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { }
|
|
static inline void
|
|
perf_sw_event_sched(u32 event_id, u64 nr, u64 addr) { }
|
|
static inline void
|
|
perf_bp_event(struct perf_event *event, void *data) { }
|
|
|
|
static inline int perf_register_guest_info_callbacks
|
|
(struct perf_guest_info_callbacks *callbacks) { return 0; }
|
|
static inline int perf_unregister_guest_info_callbacks
|
|
(struct perf_guest_info_callbacks *callbacks) { return 0; }
|
|
|
|
static inline void perf_event_mmap(struct vm_area_struct *vma) { }
|
|
static inline void perf_event_exec(void) { }
|
|
static inline void perf_event_comm(struct task_struct *tsk, bool exec) { }
|
|
static inline void perf_event_fork(struct task_struct *tsk) { }
|
|
static inline void perf_event_init(void) { }
|
|
static inline int perf_swevent_get_recursion_context(void) { return -1; }
|
|
static inline void perf_swevent_put_recursion_context(int rctx) { }
|
|
static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; }
|
|
static inline void perf_event_enable(struct perf_event *event) { }
|
|
static inline void perf_event_disable(struct perf_event *event) { }
|
|
static inline int __perf_event_disable(void *info) { return -1; }
|
|
static inline void perf_event_task_tick(void) { }
|
|
static inline int perf_event_release_kernel(struct perf_event *event) { return 0; }
|
|
#endif
|
|
|
|
#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
|
|
extern bool perf_event_can_stop_tick(void);
|
|
#else
|
|
static inline bool perf_event_can_stop_tick(void) { return true; }
|
|
#endif
|
|
|
|
#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
|
|
extern void perf_restore_debug_store(void);
|
|
#else
|
|
static inline void perf_restore_debug_store(void) { }
|
|
#endif
|
|
|
|
#define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
|
|
|
|
/*
|
|
* This has to have a higher priority than migration_notifier in sched/core.c.
|
|
*/
|
|
#define perf_cpu_notifier(fn) \
|
|
do { \
|
|
static struct notifier_block fn##_nb = \
|
|
{ .notifier_call = fn, .priority = CPU_PRI_PERF }; \
|
|
unsigned long cpu = smp_processor_id(); \
|
|
unsigned long flags; \
|
|
\
|
|
cpu_notifier_register_begin(); \
|
|
fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
|
|
(void *)(unsigned long)cpu); \
|
|
local_irq_save(flags); \
|
|
fn(&fn##_nb, (unsigned long)CPU_STARTING, \
|
|
(void *)(unsigned long)cpu); \
|
|
local_irq_restore(flags); \
|
|
fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
|
|
(void *)(unsigned long)cpu); \
|
|
__register_cpu_notifier(&fn##_nb); \
|
|
cpu_notifier_register_done(); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Bare-bones version of perf_cpu_notifier(), which doesn't invoke the
|
|
* callback for already online CPUs.
|
|
*/
|
|
#define __perf_cpu_notifier(fn) \
|
|
do { \
|
|
static struct notifier_block fn##_nb = \
|
|
{ .notifier_call = fn, .priority = CPU_PRI_PERF }; \
|
|
\
|
|
__register_cpu_notifier(&fn##_nb); \
|
|
} while (0)
|
|
|
|
struct perf_pmu_events_attr {
|
|
struct device_attribute attr;
|
|
u64 id;
|
|
const char *event_str;
|
|
};
|
|
|
|
ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
|
|
char *page);
|
|
|
|
#define PMU_EVENT_ATTR(_name, _var, _id, _show) \
|
|
static struct perf_pmu_events_attr _var = { \
|
|
.attr = __ATTR(_name, 0444, _show, NULL), \
|
|
.id = _id, \
|
|
};
|
|
|
|
#define PMU_EVENT_ATTR_STRING(_name, _var, _str) \
|
|
static struct perf_pmu_events_attr _var = { \
|
|
.attr = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \
|
|
.id = 0, \
|
|
.event_str = _str, \
|
|
};
|
|
|
|
#define PMU_FORMAT_ATTR(_name, _format) \
|
|
static ssize_t \
|
|
_name##_show(struct device *dev, \
|
|
struct device_attribute *attr, \
|
|
char *page) \
|
|
{ \
|
|
BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
|
|
return sprintf(page, _format "\n"); \
|
|
} \
|
|
\
|
|
static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
|
|
|
|
#endif /* _LINUX_PERF_EVENT_H */
|