2 * Performance events x86 architecture header
4 * Copyright (C) 2008 Thomas Gleixner <tglx@linutronix.de>
5 * Copyright (C) 2008-2009 Red Hat, Inc., Ingo Molnar
6 * Copyright (C) 2009 Jaswinder Singh Rajput
7 * Copyright (C) 2009 Advanced Micro Devices, Inc., Robert Richter
8 * Copyright (C) 2008-2009 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
9 * Copyright (C) 2009 Intel Corporation, <markus.t.metzger@intel.com>
10 * Copyright (C) 2009 Google, Inc., Stephane Eranian
12 * For licencing details see kernel-base/COPYING
15 #include <linux/perf_event.h>
19 * register -------------------------------
20 * | HT | no HT | HT | no HT |
21 *-----------------------------------------
22 * offcore | core | core | cpu | core |
23 * lbr_sel | core | core | cpu | core |
24 * ld_lat | cpu | core | cpu | core |
25 *-----------------------------------------
27 * Given that there is a small number of shared regs,
28 * we can pre-allocate their slot in the per-cpu
29 * per-core reg tables.
32 EXTRA_REG_NONE
= -1, /* not used */
34 EXTRA_REG_RSP_0
= 0, /* offcore_response_0 */
35 EXTRA_REG_RSP_1
= 1, /* offcore_response_1 */
36 EXTRA_REG_LBR
= 2, /* lbr_select */
38 EXTRA_REG_MAX
/* number of entries needed */
41 struct event_constraint
{
43 unsigned long idxmsk
[BITS_TO_LONGS(X86_PMC_IDX_MAX
)];
53 int nb_id
; /* NorthBridge id */
54 int refcnt
; /* reference count */
55 struct perf_event
*owners
[X86_PMC_IDX_MAX
];
56 struct event_constraint event_constraints
[X86_PMC_IDX_MAX
];
59 /* The maximal number of PEBS events: */
60 #define MAX_PEBS_EVENTS 4
63 * A debug store configuration.
65 * We only support architectures that use 64bit fields.
70 u64 bts_absolute_maximum
;
71 u64 bts_interrupt_threshold
;
74 u64 pebs_absolute_maximum
;
75 u64 pebs_interrupt_threshold
;
76 u64 pebs_event_reset
[MAX_PEBS_EVENTS
];
83 raw_spinlock_t lock
; /* per-core: protect structure */
84 u64 config
; /* extra MSR config */
85 u64 reg
; /* extra MSR number */
86 atomic_t ref
; /* reference count */
92 * Used to coordinate shared registers between HT threads or
93 * among events on a single PMU.
95 struct intel_shared_regs
{
96 struct er_account regs
[EXTRA_REG_MAX
];
97 int refcnt
; /* per-core: #HT threads */
98 unsigned core_id
; /* per-core: core id */
101 #define MAX_LBR_ENTRIES 16
103 struct cpu_hw_events
{
105 * Generic x86 PMC bits
107 struct perf_event
*events
[X86_PMC_IDX_MAX
]; /* in counter order */
108 unsigned long active_mask
[BITS_TO_LONGS(X86_PMC_IDX_MAX
)];
109 unsigned long running
[BITS_TO_LONGS(X86_PMC_IDX_MAX
)];
115 int assign
[X86_PMC_IDX_MAX
]; /* event to counter assignment */
116 u64 tags
[X86_PMC_IDX_MAX
];
117 struct perf_event
*event_list
[X86_PMC_IDX_MAX
]; /* in enabled order */
119 unsigned int group_flag
;
123 * Intel DebugStore bits
125 struct debug_store
*ds
;
133 struct perf_branch_stack lbr_stack
;
134 struct perf_branch_entry lbr_entries
[MAX_LBR_ENTRIES
];
135 struct er_account
*lbr_sel
;
139 * Intel host/guest exclude bits
141 u64 intel_ctrl_guest_mask
;
142 u64 intel_ctrl_host_mask
;
143 struct perf_guest_switch_msr guest_switch_msrs
[X86_PMC_IDX_MAX
];
146 * manage shared (per-core, per-cpu) registers
147 * used on Intel NHM/WSM/SNB
149 struct intel_shared_regs
*shared_regs
;
154 struct amd_nb
*amd_nb
;
155 /* Inverted mask of bits to clear in the perf_ctr ctrl registers */
156 u64 perf_ctr_virt_mask
;
158 void *kfree_on_online
;
161 #define __EVENT_CONSTRAINT(c, n, m, w, o) {\
162 { .idxmsk64 = (n) }, \
169 #define EVENT_CONSTRAINT(c, n, m) \
170 __EVENT_CONSTRAINT(c, n, m, HWEIGHT(n), 0)
173 * The overlap flag marks event constraints with overlapping counter
174 * masks. This is the case if the counter mask of such an event is not
175 * a subset of any other counter mask of a constraint with an equal or
176 * higher weight, e.g.:
178 * c_overlaps = EVENT_CONSTRAINT_OVERLAP(0, 0x09, 0);
179 * c_another1 = EVENT_CONSTRAINT(0, 0x07, 0);
180 * c_another2 = EVENT_CONSTRAINT(0, 0x38, 0);
182 * The event scheduler may not select the correct counter in the first
183 * cycle because it needs to know which subsequent events will be
184 * scheduled. It may fail to schedule the events then. So we set the
185 * overlap flag for such constraints to give the scheduler a hint which
186 * events to select for counter rescheduling.
188 * Care must be taken as the rescheduling algorithm is O(n!) which
189 * will increase scheduling cycles for an over-commited system
190 * dramatically. The number of such EVENT_CONSTRAINT_OVERLAP() macros
191 * and its counter masks must be kept at a minimum.
193 #define EVENT_CONSTRAINT_OVERLAP(c, n, m) \
194 __EVENT_CONSTRAINT(c, n, m, HWEIGHT(n), 1)
197 * Constraint on the Event code.
199 #define INTEL_EVENT_CONSTRAINT(c, n) \
200 EVENT_CONSTRAINT(c, n, ARCH_PERFMON_EVENTSEL_EVENT)
203 * Constraint on the Event code + UMask + fixed-mask
205 * filter mask to validate fixed counter events.
206 * the following filters disqualify for fixed counters:
210 * The other filters are supported by fixed counters.
211 * The any-thread option is supported starting with v3.
213 #define FIXED_EVENT_CONSTRAINT(c, n) \
214 EVENT_CONSTRAINT(c, (1ULL << (32+n)), X86_RAW_EVENT_MASK)
217 * Constraint on the Event code + UMask
219 #define INTEL_UEVENT_CONSTRAINT(c, n) \
220 EVENT_CONSTRAINT(c, n, INTEL_ARCH_EVENT_MASK)
222 #define EVENT_CONSTRAINT_END \
223 EVENT_CONSTRAINT(0, 0, 0)
225 #define for_each_event_constraint(e, c) \
226 for ((e) = (c); (e)->weight; (e)++)
229 * Extra registers for specific events.
231 * Some events need large masks and require external MSRs.
232 * Those extra MSRs end up being shared for all events on
233 * a PMU and sometimes between PMU of sibling HT threads.
234 * In either case, the kernel needs to handle conflicting
235 * accesses to those extra, shared, regs. The data structure
236 * to manage those registers is stored in cpu_hw_event.
243 int idx
; /* per_xxx->regs[] reg index */
246 #define EVENT_EXTRA_REG(e, ms, m, vm, i) { \
249 .config_mask = (m), \
250 .valid_mask = (vm), \
251 .idx = EXTRA_REG_##i \
254 #define INTEL_EVENT_EXTRA_REG(event, msr, vm, idx) \
255 EVENT_EXTRA_REG(event, msr, ARCH_PERFMON_EVENTSEL_EVENT, vm, idx)
257 #define EVENT_EXTRA_END EVENT_EXTRA_REG(0, 0, 0, 0, RSP_0)
259 union perf_capabilities
{
270 struct x86_pmu_quirk
{
271 struct x86_pmu_quirk
*next
;
275 union x86_pmu_config
{
296 #define X86_CONFIG(args...) ((union x86_pmu_config){.bits = {args}}).value
299 * struct x86_pmu - generic x86 pmu
303 * Generic x86 PMC bits
307 int (*handle_irq
)(struct pt_regs
*);
308 void (*disable_all
)(void);
309 void (*enable_all
)(int added
);
310 void (*enable
)(struct perf_event
*);
311 void (*disable
)(struct perf_event
*);
312 int (*hw_config
)(struct perf_event
*event
);
313 int (*schedule_events
)(struct cpu_hw_events
*cpuc
, int n
, int *assign
);
316 u64 (*event_map
)(int);
319 int num_counters_fixed
;
323 unsigned long events_maskl
;
324 unsigned long events_mask
[BITS_TO_LONGS(ARCH_PERFMON_EVENTS_COUNT
)];
329 struct event_constraint
*
330 (*get_event_constraints
)(struct cpu_hw_events
*cpuc
,
331 struct perf_event
*event
);
333 void (*put_event_constraints
)(struct cpu_hw_events
*cpuc
,
334 struct perf_event
*event
);
335 struct event_constraint
*event_constraints
;
336 struct x86_pmu_quirk
*quirks
;
337 int perfctr_second_write
;
343 struct attribute
**format_attrs
;
348 int (*cpu_prepare
)(int cpu
);
349 void (*cpu_starting
)(int cpu
);
350 void (*cpu_dying
)(int cpu
);
351 void (*cpu_dead
)(int cpu
);
352 void (*flush_branch_stack
)(void);
355 * Intel Arch Perfmon v2+
358 union perf_capabilities intel_cap
;
361 * Intel DebugStore bits
364 int bts_active
, pebs_active
;
365 int pebs_record_size
;
366 void (*drain_pebs
)(struct pt_regs
*regs
);
367 struct event_constraint
*pebs_constraints
;
368 void (*pebs_aliases
)(struct perf_event
*event
);
373 unsigned long lbr_tos
, lbr_from
, lbr_to
; /* MSR base regs */
374 int lbr_nr
; /* hardware stack size */
375 u64 lbr_sel_mask
; /* LBR_SELECT valid bits */
376 const int *lbr_sel_map
; /* lbr_select mappings */
379 * Extra registers for events
381 struct extra_reg
*extra_regs
;
382 unsigned int er_flags
;
385 * Intel host/guest support (KVM)
387 struct perf_guest_switch_msr
*(*guest_get_msrs
)(int *nr
);
390 #define x86_add_quirk(func_) \
392 static struct x86_pmu_quirk __quirk __initdata = { \
395 __quirk.next = x86_pmu.quirks; \
396 x86_pmu.quirks = &__quirk; \
399 #define ERF_NO_HT_SHARING 1
400 #define ERF_HAS_RSP_1 2
402 extern struct x86_pmu x86_pmu __read_mostly
;
404 DECLARE_PER_CPU(struct cpu_hw_events
, cpu_hw_events
);
406 int x86_perf_event_set_period(struct perf_event
*event
);
409 * Generalized hw caching related hw_event table, filled
410 * in on a per model basis. A value of 0 means
411 * 'not supported', -1 means 'hw_event makes no sense on
412 * this CPU', any other value means the raw hw_event
416 #define C(x) PERF_COUNT_HW_CACHE_##x
418 extern u64 __read_mostly hw_cache_event_ids
419 [PERF_COUNT_HW_CACHE_MAX
]
420 [PERF_COUNT_HW_CACHE_OP_MAX
]
421 [PERF_COUNT_HW_CACHE_RESULT_MAX
];
422 extern u64 __read_mostly hw_cache_extra_regs
423 [PERF_COUNT_HW_CACHE_MAX
]
424 [PERF_COUNT_HW_CACHE_OP_MAX
]
425 [PERF_COUNT_HW_CACHE_RESULT_MAX
];
427 u64
x86_perf_event_update(struct perf_event
*event
);
429 static inline int x86_pmu_addr_offset(int index
)
433 /* offset = X86_FEATURE_PERFCTR_CORE ? index << 1 : index */
434 alternative_io(ASM_NOP2
,
436 X86_FEATURE_PERFCTR_CORE
,
443 static inline unsigned int x86_pmu_config_addr(int index
)
445 return x86_pmu
.eventsel
+ x86_pmu_addr_offset(index
);
448 static inline unsigned int x86_pmu_event_addr(int index
)
450 return x86_pmu
.perfctr
+ x86_pmu_addr_offset(index
);
453 int x86_setup_perfctr(struct perf_event
*event
);
455 int x86_pmu_hw_config(struct perf_event
*event
);
457 void x86_pmu_disable_all(void);
459 static inline void __x86_pmu_enable_event(struct hw_perf_event
*hwc
,
462 u64 disable_mask
= __this_cpu_read(cpu_hw_events
.perf_ctr_virt_mask
);
464 if (hwc
->extra_reg
.reg
)
465 wrmsrl(hwc
->extra_reg
.reg
, hwc
->extra_reg
.config
);
466 wrmsrl(hwc
->config_base
, (hwc
->config
| enable_mask
) & ~disable_mask
);
469 void x86_pmu_enable_all(int added
);
471 int x86_schedule_events(struct cpu_hw_events
*cpuc
, int n
, int *assign
);
473 void x86_pmu_stop(struct perf_event
*event
, int flags
);
475 static inline void x86_pmu_disable_event(struct perf_event
*event
)
477 struct hw_perf_event
*hwc
= &event
->hw
;
479 wrmsrl(hwc
->config_base
, hwc
->config
);
482 void x86_pmu_enable_event(struct perf_event
*event
);
484 int x86_pmu_handle_irq(struct pt_regs
*regs
);
486 extern struct event_constraint emptyconstraint
;
488 extern struct event_constraint unconstrained
;
490 static inline bool kernel_ip(unsigned long ip
)
493 return ip
> PAGE_OFFSET
;
499 #ifdef CONFIG_CPU_SUP_AMD
501 int amd_pmu_init(void);
503 #else /* CONFIG_CPU_SUP_AMD */
505 static inline int amd_pmu_init(void)
510 #endif /* CONFIG_CPU_SUP_AMD */
512 #ifdef CONFIG_CPU_SUP_INTEL
514 int intel_pmu_save_and_restart(struct perf_event
*event
);
516 struct event_constraint
*
517 x86_get_event_constraints(struct cpu_hw_events
*cpuc
, struct perf_event
*event
);
519 struct intel_shared_regs
*allocate_shared_regs(int cpu
);
521 int intel_pmu_init(void);
523 void init_debug_store_on_cpu(int cpu
);
525 void fini_debug_store_on_cpu(int cpu
);
527 void release_ds_buffers(void);
529 void reserve_ds_buffers(void);
531 extern struct event_constraint bts_constraint
;
533 void intel_pmu_enable_bts(u64 config
);
535 void intel_pmu_disable_bts(void);
537 int intel_pmu_drain_bts_buffer(void);
539 extern struct event_constraint intel_core2_pebs_event_constraints
[];
541 extern struct event_constraint intel_atom_pebs_event_constraints
[];
543 extern struct event_constraint intel_nehalem_pebs_event_constraints
[];
545 extern struct event_constraint intel_westmere_pebs_event_constraints
[];
547 extern struct event_constraint intel_snb_pebs_event_constraints
[];
549 struct event_constraint
*intel_pebs_constraints(struct perf_event
*event
);
551 void intel_pmu_pebs_enable(struct perf_event
*event
);
553 void intel_pmu_pebs_disable(struct perf_event
*event
);
555 void intel_pmu_pebs_enable_all(void);
557 void intel_pmu_pebs_disable_all(void);
559 void intel_ds_init(void);
561 void intel_pmu_lbr_reset(void);
563 void intel_pmu_lbr_enable(struct perf_event
*event
);
565 void intel_pmu_lbr_disable(struct perf_event
*event
);
567 void intel_pmu_lbr_enable_all(void);
569 void intel_pmu_lbr_disable_all(void);
571 void intel_pmu_lbr_read(void);
573 void intel_pmu_lbr_init_core(void);
575 void intel_pmu_lbr_init_nhm(void);
577 void intel_pmu_lbr_init_atom(void);
579 void intel_pmu_lbr_init_snb(void);
581 int intel_pmu_setup_lbr_filter(struct perf_event
*event
);
583 int p4_pmu_init(void);
585 int p6_pmu_init(void);
587 #else /* CONFIG_CPU_SUP_INTEL */
589 static inline void reserve_ds_buffers(void)
593 static inline void release_ds_buffers(void)
597 static inline int intel_pmu_init(void)
602 static inline struct intel_shared_regs
*allocate_shared_regs(int cpu
)
607 #endif /* CONFIG_CPU_SUP_INTEL */