1 #include <linux/bitops.h>
2 #include <linux/types.h>
3 #include <linux/slab.h>
5 #include <asm/perf_event.h>
8 #include "perf_event.h"
10 /* The size of a BTS record in bytes: */
11 #define BTS_RECORD_SIZE 24
13 #define BTS_BUFFER_SIZE (PAGE_SIZE << 4)
14 #define PEBS_BUFFER_SIZE (PAGE_SIZE << 4)
15 #define PEBS_FIXUP_SIZE PAGE_SIZE
18 * pebs_record_32 for p4 and core not supported
20 struct pebs_record_32 {
28 union intel_x86_pebs_dse {
31 unsigned int ld_dse:4;
32 unsigned int ld_stlb_miss:1;
33 unsigned int ld_locked:1;
34 unsigned int ld_reserved:26;
37 unsigned int st_l1d_hit:1;
38 unsigned int st_reserved1:3;
39 unsigned int st_stlb_miss:1;
40 unsigned int st_locked:1;
41 unsigned int st_reserved2:26;
47 * Map PEBS Load Latency Data Source encodings to generic
48 * memory data source information
50 #define P(a, b) PERF_MEM_S(a, b)
51 #define OP_LH (P(OP, LOAD) | P(LVL, HIT))
52 #define SNOOP_NONE_MISS (P(SNOOP, NONE) | P(SNOOP, MISS))
54 static const u64 pebs_data_source[] = {
55 P(OP, LOAD) | P(LVL, MISS) | P(LVL, L3) | P(SNOOP, NA),/* 0x00:ukn L3 */
56 OP_LH | P(LVL, L1) | P(SNOOP, NONE), /* 0x01: L1 local */
57 OP_LH | P(LVL, LFB) | P(SNOOP, NONE), /* 0x02: LFB hit */
58 OP_LH | P(LVL, L2) | P(SNOOP, NONE), /* 0x03: L2 hit */
59 OP_LH | P(LVL, L3) | P(SNOOP, NONE), /* 0x04: L3 hit */
60 OP_LH | P(LVL, L3) | P(SNOOP, MISS), /* 0x05: L3 hit, snoop miss */
61 OP_LH | P(LVL, L3) | P(SNOOP, HIT), /* 0x06: L3 hit, snoop hit */
62 OP_LH | P(LVL, L3) | P(SNOOP, HITM), /* 0x07: L3 hit, snoop hitm */
63 OP_LH | P(LVL, REM_CCE1) | P(SNOOP, HIT), /* 0x08: L3 miss snoop hit */
64 OP_LH | P(LVL, REM_CCE1) | P(SNOOP, HITM), /* 0x09: L3 miss snoop hitm*/
65 OP_LH | P(LVL, LOC_RAM) | P(SNOOP, HIT), /* 0x0a: L3 miss, shared */
66 OP_LH | P(LVL, REM_RAM1) | P(SNOOP, HIT), /* 0x0b: L3 miss, shared */
67 OP_LH | P(LVL, LOC_RAM) | SNOOP_NONE_MISS,/* 0x0c: L3 miss, excl */
68 OP_LH | P(LVL, REM_RAM1) | SNOOP_NONE_MISS,/* 0x0d: L3 miss, excl */
69 OP_LH | P(LVL, IO) | P(SNOOP, NONE), /* 0x0e: I/O */
70 OP_LH | P(LVL, UNC) | P(SNOOP, NONE), /* 0x0f: uncached */
73 static u64 precise_store_data(u64 status)
75 union intel_x86_pebs_dse dse;
76 u64 val = P(OP, STORE) | P(SNOOP, NA) | P(LVL, L1) | P(TLB, L2);
82 * 1 = stored missed 2nd level TLB
84 * so it either hit the walker or the OS
85 * otherwise hit 2nd level TLB
93 * bit 0: hit L1 data cache
94 * if not set, then all we know is that
103 * bit 5: Locked prefix
106 val |= P(LOCK, LOCKED);
111 static u64 precise_datala_hsw(struct perf_event *event, u64 status)
113 union perf_mem_data_src dse;
115 dse.val = PERF_MEM_NA;
117 if (event->hw.flags & PERF_X86_EVENT_PEBS_ST_HSW)
118 dse.mem_op = PERF_MEM_OP_STORE;
119 else if (event->hw.flags & PERF_X86_EVENT_PEBS_LD_HSW)
120 dse.mem_op = PERF_MEM_OP_LOAD;
123 * L1 info only valid for following events:
125 * MEM_UOPS_RETIRED.STLB_MISS_STORES
126 * MEM_UOPS_RETIRED.LOCK_STORES
127 * MEM_UOPS_RETIRED.SPLIT_STORES
128 * MEM_UOPS_RETIRED.ALL_STORES
130 if (event->hw.flags & PERF_X86_EVENT_PEBS_ST_HSW) {
132 dse.mem_lvl = PERF_MEM_LVL_L1 | PERF_MEM_LVL_HIT;
134 dse.mem_lvl = PERF_MEM_LVL_L1 | PERF_MEM_LVL_MISS;
139 static u64 load_latency_data(u64 status)
141 union intel_x86_pebs_dse dse;
143 int model = boot_cpu_data.x86_model;
144 int fam = boot_cpu_data.x86;
149 * use the mapping table for bit 0-3
151 val = pebs_data_source[dse.ld_dse];
154 * Nehalem models do not support TLB, Lock infos
156 if (fam == 0x6 && (model == 26 || model == 30
157 || model == 31 || model == 46)) {
158 val |= P(TLB, NA) | P(LOCK, NA);
163 * 0 = did not miss 2nd level TLB
164 * 1 = missed 2nd level TLB
166 if (dse.ld_stlb_miss)
167 val |= P(TLB, MISS) | P(TLB, L2);
169 val |= P(TLB, HIT) | P(TLB, L1) | P(TLB, L2);
172 * bit 5: locked prefix
175 val |= P(LOCK, LOCKED);
180 struct pebs_record_core {
184 u64 r8, r9, r10, r11;
185 u64 r12, r13, r14, r15;
188 struct pebs_record_nhm {
192 u64 r8, r9, r10, r11;
193 u64 r12, r13, r14, r15;
194 u64 status, dla, dse, lat;
198 * Same as pebs_record_nhm, with two additional fields.
200 struct pebs_record_hsw {
204 u64 r8, r9, r10, r11;
205 u64 r12, r13, r14, r15;
206 u64 status, dla, dse, lat;
207 u64 real_ip, tsx_tuning;
210 union hsw_tsx_tuning {
212 u32 cycles_last_block : 32,
215 instruction_abort : 1,
216 non_instruction_abort : 1,
225 #define PEBS_HSW_TSX_FLAGS 0xff00000000ULL
227 /* Same as HSW, plus TSC */
229 struct pebs_record_skl {
233 u64 r8, r9, r10, r11;
234 u64 r12, r13, r14, r15;
235 u64 status, dla, dse, lat;
236 u64 real_ip, tsx_tuning;
240 void init_debug_store_on_cpu(int cpu)
242 struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
247 wrmsr_on_cpu(cpu, MSR_IA32_DS_AREA,
248 (u32)((u64)(unsigned long)ds),
249 (u32)((u64)(unsigned long)ds >> 32));
252 void fini_debug_store_on_cpu(int cpu)
254 if (!per_cpu(cpu_hw_events, cpu).ds)
257 wrmsr_on_cpu(cpu, MSR_IA32_DS_AREA, 0, 0);
260 static DEFINE_PER_CPU(void *, insn_buffer);
262 static int alloc_pebs_buffer(int cpu)
264 struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
265 int node = cpu_to_node(cpu);
267 void *buffer, *ibuffer;
272 buffer = kzalloc_node(PEBS_BUFFER_SIZE, GFP_KERNEL, node);
273 if (unlikely(!buffer))
277 * HSW+ already provides us the eventing ip; no need to allocate this
280 if (x86_pmu.intel_cap.pebs_format < 2) {
281 ibuffer = kzalloc_node(PEBS_FIXUP_SIZE, GFP_KERNEL, node);
286 per_cpu(insn_buffer, cpu) = ibuffer;
289 max = PEBS_BUFFER_SIZE / x86_pmu.pebs_record_size;
291 ds->pebs_buffer_base = (u64)(unsigned long)buffer;
292 ds->pebs_index = ds->pebs_buffer_base;
293 ds->pebs_absolute_maximum = ds->pebs_buffer_base +
294 max * x86_pmu.pebs_record_size;
299 static void release_pebs_buffer(int cpu)
301 struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
303 if (!ds || !x86_pmu.pebs)
306 kfree(per_cpu(insn_buffer, cpu));
307 per_cpu(insn_buffer, cpu) = NULL;
309 kfree((void *)(unsigned long)ds->pebs_buffer_base);
310 ds->pebs_buffer_base = 0;
313 static int alloc_bts_buffer(int cpu)
315 struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
316 int node = cpu_to_node(cpu);
323 buffer = kzalloc_node(BTS_BUFFER_SIZE, GFP_KERNEL | __GFP_NOWARN, node);
324 if (unlikely(!buffer)) {
325 WARN_ONCE(1, "%s: BTS buffer allocation failure\n", __func__);
329 max = BTS_BUFFER_SIZE / BTS_RECORD_SIZE;
332 ds->bts_buffer_base = (u64)(unsigned long)buffer;
333 ds->bts_index = ds->bts_buffer_base;
334 ds->bts_absolute_maximum = ds->bts_buffer_base +
335 max * BTS_RECORD_SIZE;
336 ds->bts_interrupt_threshold = ds->bts_absolute_maximum -
337 thresh * BTS_RECORD_SIZE;
342 static void release_bts_buffer(int cpu)
344 struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
346 if (!ds || !x86_pmu.bts)
349 kfree((void *)(unsigned long)ds->bts_buffer_base);
350 ds->bts_buffer_base = 0;
353 static int alloc_ds_buffer(int cpu)
355 int node = cpu_to_node(cpu);
356 struct debug_store *ds;
358 ds = kzalloc_node(sizeof(*ds), GFP_KERNEL, node);
362 per_cpu(cpu_hw_events, cpu).ds = ds;
367 static void release_ds_buffer(int cpu)
369 struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
374 per_cpu(cpu_hw_events, cpu).ds = NULL;
378 void release_ds_buffers(void)
382 if (!x86_pmu.bts && !x86_pmu.pebs)
386 for_each_online_cpu(cpu)
387 fini_debug_store_on_cpu(cpu);
389 for_each_possible_cpu(cpu) {
390 release_pebs_buffer(cpu);
391 release_bts_buffer(cpu);
392 release_ds_buffer(cpu);
397 void reserve_ds_buffers(void)
399 int bts_err = 0, pebs_err = 0;
402 x86_pmu.bts_active = 0;
403 x86_pmu.pebs_active = 0;
405 if (!x86_pmu.bts && !x86_pmu.pebs)
416 for_each_possible_cpu(cpu) {
417 if (alloc_ds_buffer(cpu)) {
422 if (!bts_err && alloc_bts_buffer(cpu))
425 if (!pebs_err && alloc_pebs_buffer(cpu))
428 if (bts_err && pebs_err)
433 for_each_possible_cpu(cpu)
434 release_bts_buffer(cpu);
438 for_each_possible_cpu(cpu)
439 release_pebs_buffer(cpu);
442 if (bts_err && pebs_err) {
443 for_each_possible_cpu(cpu)
444 release_ds_buffer(cpu);
446 if (x86_pmu.bts && !bts_err)
447 x86_pmu.bts_active = 1;
449 if (x86_pmu.pebs && !pebs_err)
450 x86_pmu.pebs_active = 1;
452 for_each_online_cpu(cpu)
453 init_debug_store_on_cpu(cpu);
463 struct event_constraint bts_constraint =
464 EVENT_CONSTRAINT(0, 1ULL << INTEL_PMC_IDX_FIXED_BTS, 0);
466 void intel_pmu_enable_bts(u64 config)
468 unsigned long debugctlmsr;
470 debugctlmsr = get_debugctlmsr();
472 debugctlmsr |= DEBUGCTLMSR_TR;
473 debugctlmsr |= DEBUGCTLMSR_BTS;
474 if (config & ARCH_PERFMON_EVENTSEL_INT)
475 debugctlmsr |= DEBUGCTLMSR_BTINT;
477 if (!(config & ARCH_PERFMON_EVENTSEL_OS))
478 debugctlmsr |= DEBUGCTLMSR_BTS_OFF_OS;
480 if (!(config & ARCH_PERFMON_EVENTSEL_USR))
481 debugctlmsr |= DEBUGCTLMSR_BTS_OFF_USR;
483 update_debugctlmsr(debugctlmsr);
486 void intel_pmu_disable_bts(void)
488 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
489 unsigned long debugctlmsr;
494 debugctlmsr = get_debugctlmsr();
497 ~(DEBUGCTLMSR_TR | DEBUGCTLMSR_BTS | DEBUGCTLMSR_BTINT |
498 DEBUGCTLMSR_BTS_OFF_OS | DEBUGCTLMSR_BTS_OFF_USR);
500 update_debugctlmsr(debugctlmsr);
503 int intel_pmu_drain_bts_buffer(void)
505 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
506 struct debug_store *ds = cpuc->ds;
512 struct perf_event *event = cpuc->events[INTEL_PMC_IDX_FIXED_BTS];
513 struct bts_record *at, *base, *top;
514 struct perf_output_handle handle;
515 struct perf_event_header header;
516 struct perf_sample_data data;
517 unsigned long skip = 0;
523 if (!x86_pmu.bts_active)
526 base = (struct bts_record *)(unsigned long)ds->bts_buffer_base;
527 top = (struct bts_record *)(unsigned long)ds->bts_index;
532 memset(®s, 0, sizeof(regs));
534 ds->bts_index = ds->bts_buffer_base;
536 perf_sample_data_init(&data, 0, event->hw.last_period);
539 * BTS leaks kernel addresses in branches across the cpl boundary,
540 * such as traps or system calls, so unless the user is asking for
541 * kernel tracing (and right now it's not possible), we'd need to
542 * filter them out. But first we need to count how many of those we
543 * have in the current batch. This is an extra O(n) pass, however,
544 * it's much faster than the other one especially considering that
545 * n <= 2560 (BTS_BUFFER_SIZE / BTS_RECORD_SIZE * 15/16; see the
546 * alloc_bts_buffer()).
548 for (at = base; at < top; at++) {
550 * Note that right now *this* BTS code only works if
551 * attr::exclude_kernel is set, but let's keep this extra
552 * check here in case that changes.
554 if (event->attr.exclude_kernel &&
555 (kernel_ip(at->from) || kernel_ip(at->to)))
560 * Prepare a generic sample, i.e. fill in the invariant fields.
561 * We will overwrite the from and to address before we output
564 perf_prepare_sample(&header, &data, event, ®s);
566 if (perf_output_begin(&handle, event, header.size *
567 (top - base - skip)))
570 for (at = base; at < top; at++) {
571 /* Filter out any records that contain kernel addresses. */
572 if (event->attr.exclude_kernel &&
573 (kernel_ip(at->from) || kernel_ip(at->to)))
579 perf_output_sample(&handle, &header, &data, event);
582 perf_output_end(&handle);
584 /* There's new data available. */
585 event->hw.interrupts++;
586 event->pending_kill = POLL_IN;
590 static inline void intel_pmu_drain_pebs_buffer(void)
594 x86_pmu.drain_pebs(®s);
597 void intel_pmu_pebs_sched_task(struct perf_event_context *ctx, bool sched_in)
600 intel_pmu_drain_pebs_buffer();
606 struct event_constraint intel_core2_pebs_event_constraints[] = {
607 INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c0, 0x1), /* INST_RETIRED.ANY */
608 INTEL_FLAGS_UEVENT_CONSTRAINT(0xfec1, 0x1), /* X87_OPS_RETIRED.ANY */
609 INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c5, 0x1), /* BR_INST_RETIRED.MISPRED */
610 INTEL_FLAGS_UEVENT_CONSTRAINT(0x1fc7, 0x1), /* SIMD_INST_RETURED.ANY */
611 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0x1), /* MEM_LOAD_RETIRED.* */
612 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */
613 INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x01),
617 struct event_constraint intel_atom_pebs_event_constraints[] = {
618 INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c0, 0x1), /* INST_RETIRED.ANY */
619 INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c5, 0x1), /* MISPREDICTED_BRANCH_RETIRED */
620 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0x1), /* MEM_LOAD_RETIRED.* */
621 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */
622 INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x01),
626 struct event_constraint intel_slm_pebs_event_constraints[] = {
627 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */
628 INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x1),
629 /* Allow all events as PEBS with no flags */
630 INTEL_ALL_EVENT_CONSTRAINT(0, 0x1),
634 struct event_constraint intel_nehalem_pebs_event_constraints[] = {
635 INTEL_PLD_CONSTRAINT(0x100b, 0xf), /* MEM_INST_RETIRED.* */
636 INTEL_FLAGS_EVENT_CONSTRAINT(0x0f, 0xf), /* MEM_UNCORE_RETIRED.* */
637 INTEL_FLAGS_UEVENT_CONSTRAINT(0x010c, 0xf), /* MEM_STORE_RETIRED.DTLB_MISS */
638 INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xf), /* INST_RETIRED.ANY */
639 INTEL_EVENT_CONSTRAINT(0xc2, 0xf), /* UOPS_RETIRED.* */
640 INTEL_FLAGS_EVENT_CONSTRAINT(0xc4, 0xf), /* BR_INST_RETIRED.* */
641 INTEL_FLAGS_UEVENT_CONSTRAINT(0x02c5, 0xf), /* BR_MISP_RETIRED.NEAR_CALL */
642 INTEL_FLAGS_EVENT_CONSTRAINT(0xc7, 0xf), /* SSEX_UOPS_RETIRED.* */
643 INTEL_FLAGS_UEVENT_CONSTRAINT(0x20c8, 0xf), /* ITLB_MISS_RETIRED */
644 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0xf), /* MEM_LOAD_RETIRED.* */
645 INTEL_FLAGS_EVENT_CONSTRAINT(0xf7, 0xf), /* FP_ASSIST.* */
646 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */
647 INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x0f),
651 struct event_constraint intel_westmere_pebs_event_constraints[] = {
652 INTEL_PLD_CONSTRAINT(0x100b, 0xf), /* MEM_INST_RETIRED.* */
653 INTEL_FLAGS_EVENT_CONSTRAINT(0x0f, 0xf), /* MEM_UNCORE_RETIRED.* */
654 INTEL_FLAGS_UEVENT_CONSTRAINT(0x010c, 0xf), /* MEM_STORE_RETIRED.DTLB_MISS */
655 INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xf), /* INSTR_RETIRED.* */
656 INTEL_EVENT_CONSTRAINT(0xc2, 0xf), /* UOPS_RETIRED.* */
657 INTEL_FLAGS_EVENT_CONSTRAINT(0xc4, 0xf), /* BR_INST_RETIRED.* */
658 INTEL_FLAGS_EVENT_CONSTRAINT(0xc5, 0xf), /* BR_MISP_RETIRED.* */
659 INTEL_FLAGS_EVENT_CONSTRAINT(0xc7, 0xf), /* SSEX_UOPS_RETIRED.* */
660 INTEL_FLAGS_UEVENT_CONSTRAINT(0x20c8, 0xf), /* ITLB_MISS_RETIRED */
661 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0xf), /* MEM_LOAD_RETIRED.* */
662 INTEL_FLAGS_EVENT_CONSTRAINT(0xf7, 0xf), /* FP_ASSIST.* */
663 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */
664 INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x0f),
668 struct event_constraint intel_snb_pebs_event_constraints[] = {
669 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */
670 INTEL_PLD_CONSTRAINT(0x01cd, 0x8), /* MEM_TRANS_RETIRED.LAT_ABOVE_THR */
671 INTEL_PST_CONSTRAINT(0x02cd, 0x8), /* MEM_TRANS_RETIRED.PRECISE_STORES */
672 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */
673 INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf),
674 INTEL_EXCLEVT_CONSTRAINT(0xd0, 0xf), /* MEM_UOP_RETIRED.* */
675 INTEL_EXCLEVT_CONSTRAINT(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */
676 INTEL_EXCLEVT_CONSTRAINT(0xd2, 0xf), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */
677 INTEL_EXCLEVT_CONSTRAINT(0xd3, 0xf), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */
678 /* Allow all events as PEBS with no flags */
679 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf),
683 struct event_constraint intel_ivb_pebs_event_constraints[] = {
684 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */
685 INTEL_PLD_CONSTRAINT(0x01cd, 0x8), /* MEM_TRANS_RETIRED.LAT_ABOVE_THR */
686 INTEL_PST_CONSTRAINT(0x02cd, 0x8), /* MEM_TRANS_RETIRED.PRECISE_STORES */
687 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */
688 INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf),
689 INTEL_EXCLEVT_CONSTRAINT(0xd0, 0xf), /* MEM_UOP_RETIRED.* */
690 INTEL_EXCLEVT_CONSTRAINT(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */
691 INTEL_EXCLEVT_CONSTRAINT(0xd2, 0xf), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */
692 INTEL_EXCLEVT_CONSTRAINT(0xd3, 0xf), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */
693 /* Allow all events as PEBS with no flags */
694 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf),
698 struct event_constraint intel_hsw_pebs_event_constraints[] = {
699 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */
700 INTEL_PLD_CONSTRAINT(0x01cd, 0xf), /* MEM_TRANS_RETIRED.* */
701 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */
702 INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf),
703 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_NA(0x01c2, 0xf), /* UOPS_RETIRED.ALL */
704 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x11d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_LOADS */
705 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x21d0, 0xf), /* MEM_UOPS_RETIRED.LOCK_LOADS */
706 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x41d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_LOADS */
707 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x81d0, 0xf), /* MEM_UOPS_RETIRED.ALL_LOADS */
708 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x12d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_STORES */
709 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x42d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_STORES */
710 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x82d0, 0xf), /* MEM_UOPS_RETIRED.ALL_STORES */
711 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */
712 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd2, 0xf), /* MEM_LOAD_UOPS_L3_HIT_RETIRED.* */
713 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd3, 0xf), /* MEM_LOAD_UOPS_L3_MISS_RETIRED.* */
714 /* Allow all events as PEBS with no flags */
715 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf),
719 struct event_constraint intel_skl_pebs_event_constraints[] = {
720 INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x2), /* INST_RETIRED.PREC_DIST */
721 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_NA(0x01c2, 0xf), /* UOPS_RETIRED.ALL */
722 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */
723 INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf),
724 INTEL_PLD_CONSTRAINT(0x1cd, 0xf), /* MEM_TRANS_RETIRED.* */
725 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x11d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_LOADS */
726 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x12d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_STORES */
727 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x21d0, 0xf), /* MEM_INST_RETIRED.LOCK_LOADS */
728 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x22d0, 0xf), /* MEM_INST_RETIRED.LOCK_STORES */
729 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x41d0, 0xf), /* MEM_INST_RETIRED.SPLIT_LOADS */
730 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x42d0, 0xf), /* MEM_INST_RETIRED.SPLIT_STORES */
731 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x81d0, 0xf), /* MEM_INST_RETIRED.ALL_LOADS */
732 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x82d0, 0xf), /* MEM_INST_RETIRED.ALL_STORES */
733 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd1, 0xf), /* MEM_LOAD_RETIRED.* */
734 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd2, 0xf), /* MEM_LOAD_L3_HIT_RETIRED.* */
735 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd3, 0xf), /* MEM_LOAD_L3_MISS_RETIRED.* */
736 /* Allow all events as PEBS with no flags */
737 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf),
741 struct event_constraint *intel_pebs_constraints(struct perf_event *event)
743 struct event_constraint *c;
745 if (!event->attr.precise_ip)
748 if (x86_pmu.pebs_constraints) {
749 for_each_event_constraint(c, x86_pmu.pebs_constraints) {
750 if ((event->hw.config & c->cmask) == c->code) {
751 event->hw.flags |= c->flags;
757 return &emptyconstraint;
760 static inline bool pebs_is_enabled(struct cpu_hw_events *cpuc)
762 return (cpuc->pebs_enabled & ((1ULL << MAX_PEBS_EVENTS) - 1));
765 void intel_pmu_pebs_enable(struct perf_event *event)
767 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
768 struct hw_perf_event *hwc = &event->hw;
769 struct debug_store *ds = cpuc->ds;
773 hwc->config &= ~ARCH_PERFMON_EVENTSEL_INT;
775 first_pebs = !pebs_is_enabled(cpuc);
776 cpuc->pebs_enabled |= 1ULL << hwc->idx;
778 if (event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT)
779 cpuc->pebs_enabled |= 1ULL << (hwc->idx + 32);
780 else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST)
781 cpuc->pebs_enabled |= 1ULL << 63;
784 * When the event is constrained enough we can use a larger
785 * threshold and run the event with less frequent PMI.
787 if (hwc->flags & PERF_X86_EVENT_FREERUNNING) {
788 threshold = ds->pebs_absolute_maximum -
789 x86_pmu.max_pebs_events * x86_pmu.pebs_record_size;
792 perf_sched_cb_inc(event->ctx->pmu);
794 threshold = ds->pebs_buffer_base + x86_pmu.pebs_record_size;
797 * If not all events can use larger buffer,
798 * roll back to threshold = 1
801 (ds->pebs_interrupt_threshold > threshold))
802 perf_sched_cb_dec(event->ctx->pmu);
805 /* Use auto-reload if possible to save a MSR write in the PMI */
806 if (hwc->flags & PERF_X86_EVENT_AUTO_RELOAD) {
807 ds->pebs_event_reset[hwc->idx] =
808 (u64)(-hwc->sample_period) & x86_pmu.cntval_mask;
811 if (first_pebs || ds->pebs_interrupt_threshold > threshold)
812 ds->pebs_interrupt_threshold = threshold;
815 void intel_pmu_pebs_disable(struct perf_event *event)
817 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
818 struct hw_perf_event *hwc = &event->hw;
819 struct debug_store *ds = cpuc->ds;
820 bool large_pebs = ds->pebs_interrupt_threshold >
821 ds->pebs_buffer_base + x86_pmu.pebs_record_size;
824 intel_pmu_drain_pebs_buffer();
826 cpuc->pebs_enabled &= ~(1ULL << hwc->idx);
828 if (event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT)
829 cpuc->pebs_enabled &= ~(1ULL << (hwc->idx + 32));
830 else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST)
831 cpuc->pebs_enabled &= ~(1ULL << 63);
833 if (large_pebs && !pebs_is_enabled(cpuc))
834 perf_sched_cb_dec(event->ctx->pmu);
837 wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled);
839 hwc->config |= ARCH_PERFMON_EVENTSEL_INT;
842 void intel_pmu_pebs_enable_all(void)
844 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
846 if (cpuc->pebs_enabled)
847 wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled);
850 void intel_pmu_pebs_disable_all(void)
852 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
854 if (cpuc->pebs_enabled)
855 wrmsrl(MSR_IA32_PEBS_ENABLE, 0);
858 static int intel_pmu_pebs_fixup_ip(struct pt_regs *regs)
860 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
861 unsigned long from = cpuc->lbr_entries[0].from;
862 unsigned long old_to, to = cpuc->lbr_entries[0].to;
863 unsigned long ip = regs->ip;
869 * We don't need to fixup if the PEBS assist is fault like
871 if (!x86_pmu.intel_cap.pebs_trap)
875 * No LBR entry, no basic block, no rewinding
877 if (!cpuc->lbr_stack.nr || !from || !to)
881 * Basic blocks should never cross user/kernel boundaries
883 if (kernel_ip(ip) != kernel_ip(to))
887 * unsigned math, either ip is before the start (impossible) or
888 * the basic block is larger than 1 page (sanity)
890 if ((ip - to) > PEBS_FIXUP_SIZE)
894 * We sampled a branch insn, rewind using the LBR stack
897 set_linear_ip(regs, from);
902 if (!kernel_ip(ip)) {
904 u8 *buf = this_cpu_read(insn_buffer);
906 /* 'size' must fit our buffer, see above */
907 bytes = copy_from_user_nmi(buf, (void __user *)to, size);
922 is_64bit = kernel_ip(to) || !test_thread_flag(TIF_IA32);
924 insn_init(&insn, kaddr, size, is_64bit);
925 insn_get_length(&insn);
927 * Make sure there was not a problem decoding the
928 * instruction and getting the length. This is
929 * doubly important because we have an infinite
930 * loop if insn.length=0.
936 kaddr += insn.length;
941 set_linear_ip(regs, old_to);
946 * Even though we decoded the basic block, the instruction stream
947 * never matched the given IP, either the TO or the IP got corrupted.
952 static inline u64 intel_hsw_weight(struct pebs_record_skl *pebs)
954 if (pebs->tsx_tuning) {
955 union hsw_tsx_tuning tsx = { .value = pebs->tsx_tuning };
956 return tsx.cycles_last_block;
961 static inline u64 intel_hsw_transaction(struct pebs_record_skl *pebs)
963 u64 txn = (pebs->tsx_tuning & PEBS_HSW_TSX_FLAGS) >> 32;
965 /* For RTM XABORTs also log the abort code from AX */
966 if ((txn & PERF_TXN_TRANSACTION) && (pebs->ax & 1))
967 txn |= ((pebs->ax >> 24) & 0xff) << PERF_TXN_ABORT_SHIFT;
971 static void setup_pebs_sample_data(struct perf_event *event,
972 struct pt_regs *iregs, void *__pebs,
973 struct perf_sample_data *data,
974 struct pt_regs *regs)
976 #define PERF_X86_EVENT_PEBS_HSW_PREC \
977 (PERF_X86_EVENT_PEBS_ST_HSW | \
978 PERF_X86_EVENT_PEBS_LD_HSW | \
979 PERF_X86_EVENT_PEBS_NA_HSW)
981 * We cast to the biggest pebs_record but are careful not to
982 * unconditionally access the 'extra' entries.
984 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
985 struct pebs_record_skl *pebs = __pebs;
988 int fl = event->hw.flags;
993 sample_type = event->attr.sample_type;
994 dsrc = sample_type & PERF_SAMPLE_DATA_SRC;
996 fll = fl & PERF_X86_EVENT_PEBS_LDLAT;
997 fst = fl & (PERF_X86_EVENT_PEBS_ST | PERF_X86_EVENT_PEBS_HSW_PREC);
999 perf_sample_data_init(data, 0, event->hw.last_period);
1001 data->period = event->hw.last_period;
1004 * Use latency for weight (only avail with PEBS-LL)
1006 if (fll && (sample_type & PERF_SAMPLE_WEIGHT))
1007 data->weight = pebs->lat;
1010 * data.data_src encodes the data source
1013 u64 val = PERF_MEM_NA;
1015 val = load_latency_data(pebs->dse);
1016 else if (fst && (fl & PERF_X86_EVENT_PEBS_HSW_PREC))
1017 val = precise_datala_hsw(event, pebs->dse);
1019 val = precise_store_data(pebs->dse);
1020 data->data_src.val = val;
1024 * We use the interrupt regs as a base because the PEBS record
1025 * does not contain a full regs set, specifically it seems to
1026 * lack segment descriptors, which get used by things like
1029 * In the simple case fix up only the IP and BP,SP regs, for
1030 * PERF_SAMPLE_IP and PERF_SAMPLE_CALLCHAIN to function properly.
1031 * A possible PERF_SAMPLE_REGS will have to transfer all regs.
1034 regs->flags = pebs->flags;
1035 set_linear_ip(regs, pebs->ip);
1036 regs->bp = pebs->bp;
1037 regs->sp = pebs->sp;
1039 if (sample_type & PERF_SAMPLE_REGS_INTR) {
1040 regs->ax = pebs->ax;
1041 regs->bx = pebs->bx;
1042 regs->cx = pebs->cx;
1043 regs->dx = pebs->dx;
1044 regs->si = pebs->si;
1045 regs->di = pebs->di;
1046 regs->bp = pebs->bp;
1047 regs->sp = pebs->sp;
1049 regs->flags = pebs->flags;
1050 #ifndef CONFIG_X86_32
1051 regs->r8 = pebs->r8;
1052 regs->r9 = pebs->r9;
1053 regs->r10 = pebs->r10;
1054 regs->r11 = pebs->r11;
1055 regs->r12 = pebs->r12;
1056 regs->r13 = pebs->r13;
1057 regs->r14 = pebs->r14;
1058 regs->r15 = pebs->r15;
1062 if (event->attr.precise_ip > 1 && x86_pmu.intel_cap.pebs_format >= 2) {
1063 regs->ip = pebs->real_ip;
1064 regs->flags |= PERF_EFLAGS_EXACT;
1065 } else if (event->attr.precise_ip > 1 && intel_pmu_pebs_fixup_ip(regs))
1066 regs->flags |= PERF_EFLAGS_EXACT;
1068 regs->flags &= ~PERF_EFLAGS_EXACT;
1070 if ((sample_type & PERF_SAMPLE_ADDR) &&
1071 x86_pmu.intel_cap.pebs_format >= 1)
1072 data->addr = pebs->dla;
1074 if (x86_pmu.intel_cap.pebs_format >= 2) {
1075 /* Only set the TSX weight when no memory weight. */
1076 if ((sample_type & PERF_SAMPLE_WEIGHT) && !fll)
1077 data->weight = intel_hsw_weight(pebs);
1079 if (sample_type & PERF_SAMPLE_TRANSACTION)
1080 data->txn = intel_hsw_transaction(pebs);
1084 * v3 supplies an accurate time stamp, so we use that
1085 * for the time stamp.
1087 * We can only do this for the default trace clock.
1089 if (x86_pmu.intel_cap.pebs_format >= 3 &&
1090 event->attr.use_clockid == 0)
1091 data->time = native_sched_clock_from_tsc(pebs->tsc);
1093 if (has_branch_stack(event))
1094 data->br_stack = &cpuc->lbr_stack;
1097 static inline void *
1098 get_next_pebs_record_by_bit(void *base, void *top, int bit)
1100 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1107 for (at = base; at < top; at += x86_pmu.pebs_record_size) {
1108 struct pebs_record_nhm *p = at;
1110 if (test_bit(bit, (unsigned long *)&p->status)) {
1111 /* PEBS v3 has accurate status bits */
1112 if (x86_pmu.intel_cap.pebs_format >= 3)
1115 if (p->status == (1 << bit))
1118 /* clear non-PEBS bit and re-check */
1119 pebs_status = p->status & cpuc->pebs_enabled;
1120 pebs_status &= (1ULL << MAX_PEBS_EVENTS) - 1;
1121 if (pebs_status == (1 << bit))
1128 static void __intel_pmu_pebs_event(struct perf_event *event,
1129 struct pt_regs *iregs,
1130 void *base, void *top,
1133 struct perf_sample_data data;
1134 struct pt_regs regs;
1135 void *at = get_next_pebs_record_by_bit(base, top, bit);
1137 if (!intel_pmu_save_and_restart(event) &&
1138 !(event->hw.flags & PERF_X86_EVENT_AUTO_RELOAD))
1142 setup_pebs_sample_data(event, iregs, at, &data, ®s);
1143 perf_event_output(event, &data, ®s);
1144 at += x86_pmu.pebs_record_size;
1145 at = get_next_pebs_record_by_bit(at, top, bit);
1149 setup_pebs_sample_data(event, iregs, at, &data, ®s);
1152 * All but the last records are processed.
1153 * The last one is left to be able to call the overflow handler.
1155 if (perf_event_overflow(event, &data, ®s)) {
1156 x86_pmu_stop(event, 0);
1162 static void intel_pmu_drain_pebs_core(struct pt_regs *iregs)
1164 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1165 struct debug_store *ds = cpuc->ds;
1166 struct perf_event *event = cpuc->events[0]; /* PMC0 only */
1167 struct pebs_record_core *at, *top;
1170 if (!x86_pmu.pebs_active)
1173 at = (struct pebs_record_core *)(unsigned long)ds->pebs_buffer_base;
1174 top = (struct pebs_record_core *)(unsigned long)ds->pebs_index;
1177 * Whatever else happens, drain the thing
1179 ds->pebs_index = ds->pebs_buffer_base;
1181 if (!test_bit(0, cpuc->active_mask))
1184 WARN_ON_ONCE(!event);
1186 if (!event->attr.precise_ip)
1189 n = (top - at) / x86_pmu.pebs_record_size;
1193 __intel_pmu_pebs_event(event, iregs, at, top, 0, n);
1196 static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs)
1198 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1199 struct debug_store *ds = cpuc->ds;
1200 struct perf_event *event;
1201 void *base, *at, *top;
1202 short counts[MAX_PEBS_EVENTS] = {};
1203 short error[MAX_PEBS_EVENTS] = {};
1206 if (!x86_pmu.pebs_active)
1209 base = (struct pebs_record_nhm *)(unsigned long)ds->pebs_buffer_base;
1210 top = (struct pebs_record_nhm *)(unsigned long)ds->pebs_index;
1212 ds->pebs_index = ds->pebs_buffer_base;
1214 if (unlikely(base >= top))
1217 for (at = base; at < top; at += x86_pmu.pebs_record_size) {
1218 struct pebs_record_nhm *p = at;
1221 /* PEBS v3 has accurate status bits */
1222 if (x86_pmu.intel_cap.pebs_format >= 3) {
1223 for_each_set_bit(bit, (unsigned long *)&p->status,
1230 pebs_status = p->status & cpuc->pebs_enabled;
1231 pebs_status &= (1ULL << x86_pmu.max_pebs_events) - 1;
1233 bit = find_first_bit((unsigned long *)&pebs_status,
1234 x86_pmu.max_pebs_events);
1235 if (WARN(bit >= x86_pmu.max_pebs_events,
1236 "PEBS record without PEBS event! status=%Lx pebs_enabled=%Lx active_mask=%Lx",
1237 (unsigned long long)p->status, (unsigned long long)cpuc->pebs_enabled,
1238 *(unsigned long long *)cpuc->active_mask))
1242 * The PEBS hardware does not deal well with the situation
1243 * when events happen near to each other and multiple bits
1244 * are set. But it should happen rarely.
1246 * If these events include one PEBS and multiple non-PEBS
1247 * events, it doesn't impact PEBS record. The record will
1248 * be handled normally. (slow path)
1250 * If these events include two or more PEBS events, the
1251 * records for the events can be collapsed into a single
1252 * one, and it's not possible to reconstruct all events
1253 * that caused the PEBS record. It's called collision.
1254 * If collision happened, the record will be dropped.
1256 if (p->status != (1ULL << bit)) {
1257 for_each_set_bit(i, (unsigned long *)&pebs_status,
1258 x86_pmu.max_pebs_events)
1266 for (bit = 0; bit < x86_pmu.max_pebs_events; bit++) {
1267 if ((counts[bit] == 0) && (error[bit] == 0))
1270 event = cpuc->events[bit];
1271 WARN_ON_ONCE(!event);
1272 WARN_ON_ONCE(!event->attr.precise_ip);
1274 /* log dropped samples number */
1276 perf_log_lost_samples(event, error[bit]);
1279 __intel_pmu_pebs_event(event, iregs, base,
1280 top, bit, counts[bit]);
1286 * BTS, PEBS probe and setup
1289 void __init intel_ds_init(void)
1292 * No support for 32bit formats
1294 if (!boot_cpu_has(X86_FEATURE_DTES64))
1297 x86_pmu.bts = boot_cpu_has(X86_FEATURE_BTS);
1298 x86_pmu.pebs = boot_cpu_has(X86_FEATURE_PEBS);
1300 char pebs_type = x86_pmu.intel_cap.pebs_trap ? '+' : '-';
1301 int format = x86_pmu.intel_cap.pebs_format;
1305 printk(KERN_CONT "PEBS fmt0%c, ", pebs_type);
1306 x86_pmu.pebs_record_size = sizeof(struct pebs_record_core);
1307 x86_pmu.drain_pebs = intel_pmu_drain_pebs_core;
1311 printk(KERN_CONT "PEBS fmt1%c, ", pebs_type);
1312 x86_pmu.pebs_record_size = sizeof(struct pebs_record_nhm);
1313 x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm;
1317 pr_cont("PEBS fmt2%c, ", pebs_type);
1318 x86_pmu.pebs_record_size = sizeof(struct pebs_record_hsw);
1319 x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm;
1323 pr_cont("PEBS fmt3%c, ", pebs_type);
1324 x86_pmu.pebs_record_size =
1325 sizeof(struct pebs_record_skl);
1326 x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm;
1327 x86_pmu.free_running_flags |= PERF_SAMPLE_TIME;
1331 printk(KERN_CONT "no PEBS fmt%d%c, ", format, pebs_type);
1337 void perf_restore_debug_store(void)
1339 struct debug_store *ds = __this_cpu_read(cpu_hw_events.ds);
1341 if (!x86_pmu.bts && !x86_pmu.pebs)
1344 wrmsrl(MSR_IA32_DS_AREA, (unsigned long)ds);