| #include <linux/bitops.h> |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| |
| #include <asm/perf_event.h> |
| #include <asm/insn.h> |
| |
| #include "../perf_event.h" |
| |
| /* The size of a BTS record in bytes: */ |
| #define BTS_RECORD_SIZE 24 |
| |
| #define BTS_BUFFER_SIZE (PAGE_SIZE << 4) |
| #define PEBS_BUFFER_SIZE (PAGE_SIZE << 4) |
| #define PEBS_FIXUP_SIZE PAGE_SIZE |
| |
| /* |
| * pebs_record_32 for p4 and core not supported |
| |
| struct pebs_record_32 { |
| u32 flags, ip; |
| u32 ax, bc, cx, dx; |
| u32 si, di, bp, sp; |
| }; |
| |
| */ |
| |
| union intel_x86_pebs_dse { |
| u64 val; |
| struct { |
| unsigned int ld_dse:4; |
| unsigned int ld_stlb_miss:1; |
| unsigned int ld_locked:1; |
| unsigned int ld_reserved:26; |
| }; |
| struct { |
| unsigned int st_l1d_hit:1; |
| unsigned int st_reserved1:3; |
| unsigned int st_stlb_miss:1; |
| unsigned int st_locked:1; |
| unsigned int st_reserved2:26; |
| }; |
| }; |
| |
| |
| /* |
| * Map PEBS Load Latency Data Source encodings to generic |
| * memory data source information |
| */ |
| #define P(a, b) PERF_MEM_S(a, b) |
| #define OP_LH (P(OP, LOAD) | P(LVL, HIT)) |
| #define SNOOP_NONE_MISS (P(SNOOP, NONE) | P(SNOOP, MISS)) |
| |
| static const u64 pebs_data_source[] = { |
| P(OP, LOAD) | P(LVL, MISS) | P(LVL, L3) | P(SNOOP, NA),/* 0x00:ukn L3 */ |
| OP_LH | P(LVL, L1) | P(SNOOP, NONE), /* 0x01: L1 local */ |
| OP_LH | P(LVL, LFB) | P(SNOOP, NONE), /* 0x02: LFB hit */ |
| OP_LH | P(LVL, L2) | P(SNOOP, NONE), /* 0x03: L2 hit */ |
| OP_LH | P(LVL, L3) | P(SNOOP, NONE), /* 0x04: L3 hit */ |
| OP_LH | P(LVL, L3) | P(SNOOP, MISS), /* 0x05: L3 hit, snoop miss */ |
| OP_LH | P(LVL, L3) | P(SNOOP, HIT), /* 0x06: L3 hit, snoop hit */ |
| OP_LH | P(LVL, L3) | P(SNOOP, HITM), /* 0x07: L3 hit, snoop hitm */ |
| OP_LH | P(LVL, REM_CCE1) | P(SNOOP, HIT), /* 0x08: L3 miss snoop hit */ |
| OP_LH | P(LVL, REM_CCE1) | P(SNOOP, HITM), /* 0x09: L3 miss snoop hitm*/ |
| OP_LH | P(LVL, LOC_RAM) | P(SNOOP, HIT), /* 0x0a: L3 miss, shared */ |
| OP_LH | P(LVL, REM_RAM1) | P(SNOOP, HIT), /* 0x0b: L3 miss, shared */ |
| OP_LH | P(LVL, LOC_RAM) | SNOOP_NONE_MISS,/* 0x0c: L3 miss, excl */ |
| OP_LH | P(LVL, REM_RAM1) | SNOOP_NONE_MISS,/* 0x0d: L3 miss, excl */ |
| OP_LH | P(LVL, IO) | P(SNOOP, NONE), /* 0x0e: I/O */ |
| OP_LH | P(LVL, UNC) | P(SNOOP, NONE), /* 0x0f: uncached */ |
| }; |
| |
| static u64 precise_store_data(u64 status) |
| { |
| union intel_x86_pebs_dse dse; |
| u64 val = P(OP, STORE) | P(SNOOP, NA) | P(LVL, L1) | P(TLB, L2); |
| |
| dse.val = status; |
| |
| /* |
| * bit 4: TLB access |
| * 1 = stored missed 2nd level TLB |
| * |
| * so it either hit the walker or the OS |
| * otherwise hit 2nd level TLB |
| */ |
| if (dse.st_stlb_miss) |
| val |= P(TLB, MISS); |
| else |
| val |= P(TLB, HIT); |
| |
| /* |
| * bit 0: hit L1 data cache |
| * if not set, then all we know is that |
| * it missed L1D |
| */ |
| if (dse.st_l1d_hit) |
| val |= P(LVL, HIT); |
| else |
| val |= P(LVL, MISS); |
| |
| /* |
| * bit 5: Locked prefix |
| */ |
| if (dse.st_locked) |
| val |= P(LOCK, LOCKED); |
| |
| return val; |
| } |
| |
| static u64 precise_datala_hsw(struct perf_event *event, u64 status) |
| { |
| union perf_mem_data_src dse; |
| |
| dse.val = PERF_MEM_NA; |
| |
| if (event->hw.flags & PERF_X86_EVENT_PEBS_ST_HSW) |
| dse.mem_op = PERF_MEM_OP_STORE; |
| else if (event->hw.flags & PERF_X86_EVENT_PEBS_LD_HSW) |
| dse.mem_op = PERF_MEM_OP_LOAD; |
| |
| /* |
| * L1 info only valid for following events: |
| * |
| * MEM_UOPS_RETIRED.STLB_MISS_STORES |
| * MEM_UOPS_RETIRED.LOCK_STORES |
| * MEM_UOPS_RETIRED.SPLIT_STORES |
| * MEM_UOPS_RETIRED.ALL_STORES |
| */ |
| if (event->hw.flags & PERF_X86_EVENT_PEBS_ST_HSW) { |
| if (status & 1) |
| dse.mem_lvl = PERF_MEM_LVL_L1 | PERF_MEM_LVL_HIT; |
| else |
| dse.mem_lvl = PERF_MEM_LVL_L1 | PERF_MEM_LVL_MISS; |
| } |
| return dse.val; |
| } |
| |
| static u64 load_latency_data(u64 status) |
| { |
| union intel_x86_pebs_dse dse; |
| u64 val; |
| int model = boot_cpu_data.x86_model; |
| int fam = boot_cpu_data.x86; |
| |
| dse.val = status; |
| |
| /* |
| * use the mapping table for bit 0-3 |
| */ |
| val = pebs_data_source[dse.ld_dse]; |
| |
| /* |
| * Nehalem models do not support TLB, Lock infos |
| */ |
| if (fam == 0x6 && (model == 26 || model == 30 |
| || model == 31 || model == 46)) { |
| val |= P(TLB, NA) | P(LOCK, NA); |
| return val; |
| } |
| /* |
| * bit 4: TLB access |
| * 0 = did not miss 2nd level TLB |
| * 1 = missed 2nd level TLB |
| */ |
| if (dse.ld_stlb_miss) |
| val |= P(TLB, MISS) | P(TLB, L2); |
| else |
| val |= P(TLB, HIT) | P(TLB, L1) | P(TLB, L2); |
| |
| /* |
| * bit 5: locked prefix |
| */ |
| if (dse.ld_locked) |
| val |= P(LOCK, LOCKED); |
| |
| return val; |
| } |
| |
| struct pebs_record_core { |
| u64 flags, ip; |
| u64 ax, bx, cx, dx; |
| u64 si, di, bp, sp; |
| u64 r8, r9, r10, r11; |
| u64 r12, r13, r14, r15; |
| }; |
| |
| struct pebs_record_nhm { |
| u64 flags, ip; |
| u64 ax, bx, cx, dx; |
| u64 si, di, bp, sp; |
| u64 r8, r9, r10, r11; |
| u64 r12, r13, r14, r15; |
| u64 status, dla, dse, lat; |
| }; |
| |
| /* |
| * Same as pebs_record_nhm, with two additional fields. |
| */ |
| struct pebs_record_hsw { |
| u64 flags, ip; |
| u64 ax, bx, cx, dx; |
| u64 si, di, bp, sp; |
| u64 r8, r9, r10, r11; |
| u64 r12, r13, r14, r15; |
| u64 status, dla, dse, lat; |
| u64 real_ip, tsx_tuning; |
| }; |
| |
| union hsw_tsx_tuning { |
| struct { |
| u32 cycles_last_block : 32, |
| hle_abort : 1, |
| rtm_abort : 1, |
| instruction_abort : 1, |
| non_instruction_abort : 1, |
| retry : 1, |
| data_conflict : 1, |
| capacity_writes : 1, |
| capacity_reads : 1; |
| }; |
| u64 value; |
| }; |
| |
| #define PEBS_HSW_TSX_FLAGS 0xff00000000ULL |
| |
| /* Same as HSW, plus TSC */ |
| |
| struct pebs_record_skl { |
| u64 flags, ip; |
| u64 ax, bx, cx, dx; |
| u64 si, di, bp, sp; |
| u64 r8, r9, r10, r11; |
| u64 r12, r13, r14, r15; |
| u64 status, dla, dse, lat; |
| u64 real_ip, tsx_tuning; |
| u64 tsc; |
| }; |
| |
| void init_debug_store_on_cpu(int cpu) |
| { |
| struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; |
| |
| if (!ds) |
| return; |
| |
| wrmsr_on_cpu(cpu, MSR_IA32_DS_AREA, |
| (u32)((u64)(unsigned long)ds), |
| (u32)((u64)(unsigned long)ds >> 32)); |
| } |
| |
| void fini_debug_store_on_cpu(int cpu) |
| { |
| if (!per_cpu(cpu_hw_events, cpu).ds) |
| return; |
| |
| wrmsr_on_cpu(cpu, MSR_IA32_DS_AREA, 0, 0); |
| } |
| |
| static DEFINE_PER_CPU(void *, insn_buffer); |
| |
| static int alloc_pebs_buffer(int cpu) |
| { |
| struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; |
| int node = cpu_to_node(cpu); |
| int max; |
| void *buffer, *ibuffer; |
| |
| if (!x86_pmu.pebs) |
| return 0; |
| |
| buffer = kzalloc_node(PEBS_BUFFER_SIZE, GFP_KERNEL, node); |
| if (unlikely(!buffer)) |
| return -ENOMEM; |
| |
| /* |
| * HSW+ already provides us the eventing ip; no need to allocate this |
| * buffer then. |
| */ |
| if (x86_pmu.intel_cap.pebs_format < 2) { |
| ibuffer = kzalloc_node(PEBS_FIXUP_SIZE, GFP_KERNEL, node); |
| if (!ibuffer) { |
| kfree(buffer); |
| return -ENOMEM; |
| } |
| per_cpu(insn_buffer, cpu) = ibuffer; |
| } |
| |
| max = PEBS_BUFFER_SIZE / x86_pmu.pebs_record_size; |
| |
| ds->pebs_buffer_base = (u64)(unsigned long)buffer; |
| ds->pebs_index = ds->pebs_buffer_base; |
| ds->pebs_absolute_maximum = ds->pebs_buffer_base + |
| max * x86_pmu.pebs_record_size; |
| |
| return 0; |
| } |
| |
| static void release_pebs_buffer(int cpu) |
| { |
| struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; |
| |
| if (!ds || !x86_pmu.pebs) |
| return; |
| |
| kfree(per_cpu(insn_buffer, cpu)); |
| per_cpu(insn_buffer, cpu) = NULL; |
| |
| kfree((void *)(unsigned long)ds->pebs_buffer_base); |
| ds->pebs_buffer_base = 0; |
| } |
| |
| static int alloc_bts_buffer(int cpu) |
| { |
| struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; |
| int node = cpu_to_node(cpu); |
| int max, thresh; |
| void *buffer; |
| |
| if (!x86_pmu.bts) |
| return 0; |
| |
| buffer = kzalloc_node(BTS_BUFFER_SIZE, GFP_KERNEL | __GFP_NOWARN, node); |
| if (unlikely(!buffer)) { |
| WARN_ONCE(1, "%s: BTS buffer allocation failure\n", __func__); |
| return -ENOMEM; |
| } |
| |
| max = BTS_BUFFER_SIZE / BTS_RECORD_SIZE; |
| thresh = max / 16; |
| |
| ds->bts_buffer_base = (u64)(unsigned long)buffer; |
| ds->bts_index = ds->bts_buffer_base; |
| ds->bts_absolute_maximum = ds->bts_buffer_base + |
| max * BTS_RECORD_SIZE; |
| ds->bts_interrupt_threshold = ds->bts_absolute_maximum - |
| thresh * BTS_RECORD_SIZE; |
| |
| return 0; |
| } |
| |
| static void release_bts_buffer(int cpu) |
| { |
| struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; |
| |
| if (!ds || !x86_pmu.bts) |
| return; |
| |
| kfree((void *)(unsigned long)ds->bts_buffer_base); |
| ds->bts_buffer_base = 0; |
| } |
| |
| static int alloc_ds_buffer(int cpu) |
| { |
| int node = cpu_to_node(cpu); |
| struct debug_store *ds; |
| |
| ds = kzalloc_node(sizeof(*ds), GFP_KERNEL, node); |
| if (unlikely(!ds)) |
| return -ENOMEM; |
| |
| per_cpu(cpu_hw_events, cpu).ds = ds; |
| |
| return 0; |
| } |
| |
| static void release_ds_buffer(int cpu) |
| { |
| struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; |
| |
| if (!ds) |
| return; |
| |
| per_cpu(cpu_hw_events, cpu).ds = NULL; |
| kfree(ds); |
| } |
| |
| void release_ds_buffers(void) |
| { |
| int cpu; |
| |
| if (!x86_pmu.bts && !x86_pmu.pebs) |
| return; |
| |
| get_online_cpus(); |
| for_each_online_cpu(cpu) |
| fini_debug_store_on_cpu(cpu); |
| |
| for_each_possible_cpu(cpu) { |
| release_pebs_buffer(cpu); |
| release_bts_buffer(cpu); |
| release_ds_buffer(cpu); |
| } |
| put_online_cpus(); |
| } |
| |
| void reserve_ds_buffers(void) |
| { |
| int bts_err = 0, pebs_err = 0; |
| int cpu; |
| |
| x86_pmu.bts_active = 0; |
| x86_pmu.pebs_active = 0; |
| |
| if (!x86_pmu.bts && !x86_pmu.pebs) |
| return; |
| |
| if (!x86_pmu.bts) |
| bts_err = 1; |
| |
| if (!x86_pmu.pebs) |
| pebs_err = 1; |
| |
| get_online_cpus(); |
| |
| for_each_possible_cpu(cpu) { |
| if (alloc_ds_buffer(cpu)) { |
| bts_err = 1; |
| pebs_err = 1; |
| } |
| |
| if (!bts_err && alloc_bts_buffer(cpu)) |
| bts_err = 1; |
| |
| if (!pebs_err && alloc_pebs_buffer(cpu)) |
| pebs_err = 1; |
| |
| if (bts_err && pebs_err) |
| break; |
| } |
| |
| if (bts_err) { |
| for_each_possible_cpu(cpu) |
| release_bts_buffer(cpu); |
| } |
| |
| if (pebs_err) { |
| for_each_possible_cpu(cpu) |
| release_pebs_buffer(cpu); |
| } |
| |
| if (bts_err && pebs_err) { |
| for_each_possible_cpu(cpu) |
| release_ds_buffer(cpu); |
| } else { |
| if (x86_pmu.bts && !bts_err) |
| x86_pmu.bts_active = 1; |
| |
| if (x86_pmu.pebs && !pebs_err) |
| x86_pmu.pebs_active = 1; |
| |
| for_each_online_cpu(cpu) |
| init_debug_store_on_cpu(cpu); |
| } |
| |
| put_online_cpus(); |
| } |
| |
| /* |
| * BTS |
| */ |
| |
| struct event_constraint bts_constraint = |
| EVENT_CONSTRAINT(0, 1ULL << INTEL_PMC_IDX_FIXED_BTS, 0); |
| |
| void intel_pmu_enable_bts(u64 config) |
| { |
| unsigned long debugctlmsr; |
| |
| debugctlmsr = get_debugctlmsr(); |
| |
| debugctlmsr |= DEBUGCTLMSR_TR; |
| debugctlmsr |= DEBUGCTLMSR_BTS; |
| if (config & ARCH_PERFMON_EVENTSEL_INT) |
| debugctlmsr |= DEBUGCTLMSR_BTINT; |
| |
| if (!(config & ARCH_PERFMON_EVENTSEL_OS)) |
| debugctlmsr |= DEBUGCTLMSR_BTS_OFF_OS; |
| |
| if (!(config & ARCH_PERFMON_EVENTSEL_USR)) |
| debugctlmsr |= DEBUGCTLMSR_BTS_OFF_USR; |
| |
| update_debugctlmsr(debugctlmsr); |
| } |
| |
| void intel_pmu_disable_bts(void) |
| { |
| struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
| unsigned long debugctlmsr; |
| |
| if (!cpuc->ds) |
| return; |
| |
| debugctlmsr = get_debugctlmsr(); |
| |
| debugctlmsr &= |
| ~(DEBUGCTLMSR_TR | DEBUGCTLMSR_BTS | DEBUGCTLMSR_BTINT | |
| DEBUGCTLMSR_BTS_OFF_OS | DEBUGCTLMSR_BTS_OFF_USR); |
| |
| update_debugctlmsr(debugctlmsr); |
| } |
| |
| int intel_pmu_drain_bts_buffer(void) |
| { |
| struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
| struct debug_store *ds = cpuc->ds; |
| struct bts_record { |
| u64 from; |
| u64 to; |
| u64 flags; |
| }; |
| struct perf_event *event = cpuc->events[INTEL_PMC_IDX_FIXED_BTS]; |
| struct bts_record *at, *base, *top; |
| struct perf_output_handle handle; |
| struct perf_event_header header; |
| struct perf_sample_data data; |
| unsigned long skip = 0; |
| struct pt_regs regs; |
| |
| if (!event) |
| return 0; |
| |
| if (!x86_pmu.bts_active) |
| return 0; |
| |
| base = (struct bts_record *)(unsigned long)ds->bts_buffer_base; |
| top = (struct bts_record *)(unsigned long)ds->bts_index; |
| |
| if (top <= base) |
| return 0; |
| |
| memset(®s, 0, sizeof(regs)); |
| |
| ds->bts_index = ds->bts_buffer_base; |
| |
| perf_sample_data_init(&data, 0, event->hw.last_period); |
| |
| /* |
| * BTS leaks kernel addresses in branches across the cpl boundary, |
| * such as traps or system calls, so unless the user is asking for |
| * kernel tracing (and right now it's not possible), we'd need to |
| * filter them out. But first we need to count how many of those we |
| * have in the current batch. This is an extra O(n) pass, however, |
| * it's much faster than the other one especially considering that |
| * n <= 2560 (BTS_BUFFER_SIZE / BTS_RECORD_SIZE * 15/16; see the |
| * alloc_bts_buffer()). |
| */ |
| for (at = base; at < top; at++) { |
| /* |
| * Note that right now *this* BTS code only works if |
| * attr::exclude_kernel is set, but let's keep this extra |
| * check here in case that changes. |
| */ |
| if (event->attr.exclude_kernel && |
| (kernel_ip(at->from) || kernel_ip(at->to))) |
| skip++; |
| } |
| |
| /* |
| * Prepare a generic sample, i.e. fill in the invariant fields. |
| * We will overwrite the from and to address before we output |
| * the sample. |
| */ |
| perf_prepare_sample(&header, &data, event, ®s); |
| |
| if (perf_output_begin(&handle, event, header.size * |
| (top - base - skip))) |
| return 1; |
| |
| for (at = base; at < top; at++) { |
| /* Filter out any records that contain kernel addresses. */ |
| if (event->attr.exclude_kernel && |
| (kernel_ip(at->from) || kernel_ip(at->to))) |
| continue; |
| |
| data.ip = at->from; |
| data.addr = at->to; |
| |
| perf_output_sample(&handle, &header, &data, event); |
| } |
| |
| perf_output_end(&handle); |
| |
| /* There's new data available. */ |
| event->hw.interrupts++; |
| event->pending_kill = POLL_IN; |
| return 1; |
| } |
| |
| static inline void intel_pmu_drain_pebs_buffer(void) |
| { |
| struct pt_regs regs; |
| |
| x86_pmu.drain_pebs(®s); |
| } |
| |
| void intel_pmu_pebs_sched_task(struct perf_event_context *ctx, bool sched_in) |
| { |
| if (!sched_in) |
| intel_pmu_drain_pebs_buffer(); |
| } |
| |
| /* |
| * PEBS |
| */ |
| struct event_constraint intel_core2_pebs_event_constraints[] = { |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c0, 0x1), /* INST_RETIRED.ANY */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0xfec1, 0x1), /* X87_OPS_RETIRED.ANY */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c5, 0x1), /* BR_INST_RETIRED.MISPRED */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x1fc7, 0x1), /* SIMD_INST_RETURED.ANY */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0x1), /* MEM_LOAD_RETIRED.* */ |
| /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x01), |
| EVENT_CONSTRAINT_END |
| }; |
| |
| struct event_constraint intel_atom_pebs_event_constraints[] = { |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c0, 0x1), /* INST_RETIRED.ANY */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c5, 0x1), /* MISPREDICTED_BRANCH_RETIRED */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0x1), /* MEM_LOAD_RETIRED.* */ |
| /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x01), |
| /* Allow all events as PEBS with no flags */ |
| INTEL_ALL_EVENT_CONSTRAINT(0, 0x1), |
| EVENT_CONSTRAINT_END |
| }; |
| |
| struct event_constraint intel_slm_pebs_event_constraints[] = { |
| /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x1), |
| /* Allow all events as PEBS with no flags */ |
| INTEL_ALL_EVENT_CONSTRAINT(0, 0x1), |
| EVENT_CONSTRAINT_END |
| }; |
| |
| struct event_constraint intel_nehalem_pebs_event_constraints[] = { |
| INTEL_PLD_CONSTRAINT(0x100b, 0xf), /* MEM_INST_RETIRED.* */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x0f, 0xf), /* MEM_UNCORE_RETIRED.* */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x010c, 0xf), /* MEM_STORE_RETIRED.DTLB_MISS */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xf), /* INST_RETIRED.ANY */ |
| INTEL_EVENT_CONSTRAINT(0xc2, 0xf), /* UOPS_RETIRED.* */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0xc4, 0xf), /* BR_INST_RETIRED.* */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x02c5, 0xf), /* BR_MISP_RETIRED.NEAR_CALL */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0xc7, 0xf), /* SSEX_UOPS_RETIRED.* */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x20c8, 0xf), /* ITLB_MISS_RETIRED */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0xf), /* MEM_LOAD_RETIRED.* */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0xf7, 0xf), /* FP_ASSIST.* */ |
| /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x0f), |
| EVENT_CONSTRAINT_END |
| }; |
| |
| struct event_constraint intel_westmere_pebs_event_constraints[] = { |
| INTEL_PLD_CONSTRAINT(0x100b, 0xf), /* MEM_INST_RETIRED.* */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x0f, 0xf), /* MEM_UNCORE_RETIRED.* */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x010c, 0xf), /* MEM_STORE_RETIRED.DTLB_MISS */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xf), /* INSTR_RETIRED.* */ |
| INTEL_EVENT_CONSTRAINT(0xc2, 0xf), /* UOPS_RETIRED.* */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0xc4, 0xf), /* BR_INST_RETIRED.* */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0xc5, 0xf), /* BR_MISP_RETIRED.* */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0xc7, 0xf), /* SSEX_UOPS_RETIRED.* */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x20c8, 0xf), /* ITLB_MISS_RETIRED */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0xf), /* MEM_LOAD_RETIRED.* */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0xf7, 0xf), /* FP_ASSIST.* */ |
| /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x0f), |
| EVENT_CONSTRAINT_END |
| }; |
| |
| struct event_constraint intel_snb_pebs_event_constraints[] = { |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ |
| INTEL_PLD_CONSTRAINT(0x01cd, 0x8), /* MEM_TRANS_RETIRED.LAT_ABOVE_THR */ |
| INTEL_PST_CONSTRAINT(0x02cd, 0x8), /* MEM_TRANS_RETIRED.PRECISE_STORES */ |
| /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf), |
| INTEL_EXCLEVT_CONSTRAINT(0xd0, 0xf), /* MEM_UOP_RETIRED.* */ |
| INTEL_EXCLEVT_CONSTRAINT(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ |
| INTEL_EXCLEVT_CONSTRAINT(0xd2, 0xf), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */ |
| INTEL_EXCLEVT_CONSTRAINT(0xd3, 0xf), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */ |
| /* Allow all events as PEBS with no flags */ |
| INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), |
| EVENT_CONSTRAINT_END |
| }; |
| |
| struct event_constraint intel_ivb_pebs_event_constraints[] = { |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ |
| INTEL_PLD_CONSTRAINT(0x01cd, 0x8), /* MEM_TRANS_RETIRED.LAT_ABOVE_THR */ |
| INTEL_PST_CONSTRAINT(0x02cd, 0x8), /* MEM_TRANS_RETIRED.PRECISE_STORES */ |
| /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf), |
| /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c0, 0x2), |
| INTEL_EXCLEVT_CONSTRAINT(0xd0, 0xf), /* MEM_UOP_RETIRED.* */ |
| INTEL_EXCLEVT_CONSTRAINT(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ |
| INTEL_EXCLEVT_CONSTRAINT(0xd2, 0xf), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */ |
| INTEL_EXCLEVT_CONSTRAINT(0xd3, 0xf), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */ |
| /* Allow all events as PEBS with no flags */ |
| INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), |
| EVENT_CONSTRAINT_END |
| }; |
| |
| struct event_constraint intel_hsw_pebs_event_constraints[] = { |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ |
| INTEL_PLD_CONSTRAINT(0x01cd, 0xf), /* MEM_TRANS_RETIRED.* */ |
| /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf), |
| /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c0, 0x2), |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_NA(0x01c2, 0xf), /* UOPS_RETIRED.ALL */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x11d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_LOADS */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x21d0, 0xf), /* MEM_UOPS_RETIRED.LOCK_LOADS */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x41d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_LOADS */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x81d0, 0xf), /* MEM_UOPS_RETIRED.ALL_LOADS */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x12d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_STORES */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x42d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_STORES */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x82d0, 0xf), /* MEM_UOPS_RETIRED.ALL_STORES */ |
| INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ |
| INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd2, 0xf), /* MEM_LOAD_UOPS_L3_HIT_RETIRED.* */ |
| INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd3, 0xf), /* MEM_LOAD_UOPS_L3_MISS_RETIRED.* */ |
| /* Allow all events as PEBS with no flags */ |
| INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), |
| EVENT_CONSTRAINT_END |
| }; |
| |
| struct event_constraint intel_skl_pebs_event_constraints[] = { |
| INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x2), /* INST_RETIRED.PREC_DIST */ |
| /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c0, 0x2), |
| /* INST_RETIRED.TOTAL_CYCLES_PS (inv=1, cmask=16) (cycles:p). */ |
| INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x0f), |
| INTEL_PLD_CONSTRAINT(0x1cd, 0xf), /* MEM_TRANS_RETIRED.* */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x11d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_LOADS */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x12d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_STORES */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x21d0, 0xf), /* MEM_INST_RETIRED.LOCK_LOADS */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x22d0, 0xf), /* MEM_INST_RETIRED.LOCK_STORES */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x41d0, 0xf), /* MEM_INST_RETIRED.SPLIT_LOADS */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x42d0, 0xf), /* MEM_INST_RETIRED.SPLIT_STORES */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x81d0, 0xf), /* MEM_INST_RETIRED.ALL_LOADS */ |
| INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x82d0, 0xf), /* MEM_INST_RETIRED.ALL_STORES */ |
| INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd1, 0xf), /* MEM_LOAD_RETIRED.* */ |
| INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd2, 0xf), /* MEM_LOAD_L3_HIT_RETIRED.* */ |
| INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd3, 0xf), /* MEM_LOAD_L3_MISS_RETIRED.* */ |
| /* Allow all events as PEBS with no flags */ |
| INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), |
| EVENT_CONSTRAINT_END |
| }; |
| |
| struct event_constraint *intel_pebs_constraints(struct perf_event *event) |
| { |
| struct event_constraint *c; |
| |
| if (!event->attr.precise_ip) |
| return NULL; |
| |
| if (x86_pmu.pebs_constraints) { |
| for_each_event_constraint(c, x86_pmu.pebs_constraints) { |
| if ((event->hw.config & c->cmask) == c->code) { |
| event->hw.flags |= c->flags; |
| return c; |
| } |
| } |
| } |
| |
| return &emptyconstraint; |
| } |
| |
| static inline bool pebs_is_enabled(struct cpu_hw_events *cpuc) |
| { |
| return (cpuc->pebs_enabled & ((1ULL << MAX_PEBS_EVENTS) - 1)); |
| } |
| |
| void intel_pmu_pebs_enable(struct perf_event *event) |
| { |
| struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
| struct hw_perf_event *hwc = &event->hw; |
| struct debug_store *ds = cpuc->ds; |
| bool first_pebs; |
| u64 threshold; |
| |
| hwc->config &= ~ARCH_PERFMON_EVENTSEL_INT; |
| |
| first_pebs = !pebs_is_enabled(cpuc); |
| cpuc->pebs_enabled |= 1ULL << hwc->idx; |
| |
| if (event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT) |
| cpuc->pebs_enabled |= 1ULL << (hwc->idx + 32); |
| else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST) |
| cpuc->pebs_enabled |= 1ULL << 63; |
| |
| /* |
| * When the event is constrained enough we can use a larger |
| * threshold and run the event with less frequent PMI. |
| */ |
| if (hwc->flags & PERF_X86_EVENT_FREERUNNING) { |
| threshold = ds->pebs_absolute_maximum - |
| x86_pmu.max_pebs_events * x86_pmu.pebs_record_size; |
| |
| if (first_pebs) |
| perf_sched_cb_inc(event->ctx->pmu); |
| } else { |
| threshold = ds->pebs_buffer_base + x86_pmu.pebs_record_size; |
| |
| /* |
| * If not all events can use larger buffer, |
| * roll back to threshold = 1 |
| */ |
| if (!first_pebs && |
| (ds->pebs_interrupt_threshold > threshold)) |
| perf_sched_cb_dec(event->ctx->pmu); |
| } |
| |
| /* Use auto-reload if possible to save a MSR write in the PMI */ |
| if (hwc->flags & PERF_X86_EVENT_AUTO_RELOAD) { |
| ds->pebs_event_reset[hwc->idx] = |
| (u64)(-hwc->sample_period) & x86_pmu.cntval_mask; |
| } |
| |
| if (first_pebs || ds->pebs_interrupt_threshold > threshold) |
| ds->pebs_interrupt_threshold = threshold; |
| } |
| |
| void intel_pmu_pebs_disable(struct perf_event *event) |
| { |
| struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
| struct hw_perf_event *hwc = &event->hw; |
| struct debug_store *ds = cpuc->ds; |
| bool large_pebs = ds->pebs_interrupt_threshold > |
| ds->pebs_buffer_base + x86_pmu.pebs_record_size; |
| |
| if (large_pebs) |
| intel_pmu_drain_pebs_buffer(); |
| |
| cpuc->pebs_enabled &= ~(1ULL << hwc->idx); |
| |
| if (event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT) |
| cpuc->pebs_enabled &= ~(1ULL << (hwc->idx + 32)); |
| else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST) |
| cpuc->pebs_enabled &= ~(1ULL << 63); |
| |
| if (large_pebs && !pebs_is_enabled(cpuc)) |
| perf_sched_cb_dec(event->ctx->pmu); |
| |
| if (cpuc->enabled) |
| wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled); |
| |
| hwc->config |= ARCH_PERFMON_EVENTSEL_INT; |
| } |
| |
| void intel_pmu_pebs_enable_all(void) |
| { |
| struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
| |
| if (cpuc->pebs_enabled) |
| wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled); |
| } |
| |
| void intel_pmu_pebs_disable_all(void) |
| { |
| struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
| |
| if (cpuc->pebs_enabled) |
| wrmsrl(MSR_IA32_PEBS_ENABLE, 0); |
| } |
| |
| static int intel_pmu_pebs_fixup_ip(struct pt_regs *regs) |
| { |
| struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
| unsigned long from = cpuc->lbr_entries[0].from; |
| unsigned long old_to, to = cpuc->lbr_entries[0].to; |
| unsigned long ip = regs->ip; |
| int is_64bit = 0; |
| void *kaddr; |
| int size; |
| |
| /* |
| * We don't need to fixup if the PEBS assist is fault like |
| */ |
| if (!x86_pmu.intel_cap.pebs_trap) |
| return 1; |
| |
| /* |
| * No LBR entry, no basic block, no rewinding |
| */ |
| if (!cpuc->lbr_stack.nr || !from || !to) |
| return 0; |
| |
| /* |
| * Basic blocks should never cross user/kernel boundaries |
| */ |
| if (kernel_ip(ip) != kernel_ip(to)) |
| return 0; |
| |
| /* |
| * unsigned math, either ip is before the start (impossible) or |
| * the basic block is larger than 1 page (sanity) |
| */ |
| if ((ip - to) > PEBS_FIXUP_SIZE) |
| return 0; |
| |
| /* |
| * We sampled a branch insn, rewind using the LBR stack |
| */ |
| if (ip == to) { |
| set_linear_ip(regs, from); |
| return 1; |
| } |
| |
| size = ip - to; |
| if (!kernel_ip(ip)) { |
| int bytes; |
| u8 *buf = this_cpu_read(insn_buffer); |
| |
| /* 'size' must fit our buffer, see above */ |
| bytes = copy_from_user_nmi(buf, (void __user *)to, size); |
| if (bytes != 0) |
| return 0; |
| |
| kaddr = buf; |
| } else { |
| kaddr = (void *)to; |
| } |
| |
| do { |
| struct insn insn; |
| |
| old_to = to; |
| |
| #ifdef CONFIG_X86_64 |
| is_64bit = kernel_ip(to) || !test_thread_flag(TIF_IA32); |
| #endif |
| insn_init(&insn, kaddr, size, is_64bit); |
| insn_get_length(&insn); |
| /* |
| * Make sure there was not a problem decoding the |
| * instruction and getting the length. This is |
| * doubly important because we have an infinite |
| * loop if insn.length=0. |
| */ |
| if (!insn.length) |
| break; |
| |
| to += insn.length; |
| kaddr += insn.length; |
| size -= insn.length; |
| } while (to < ip); |
| |
| if (to == ip) { |
| set_linear_ip(regs, old_to); |
| return 1; |
| } |
| |
| /* |
| * Even though we decoded the basic block, the instruction stream |
| * never matched the given IP, either the TO or the IP got corrupted. |
| */ |
| return 0; |
| } |
| |
| static inline u64 intel_hsw_weight(struct pebs_record_skl *pebs) |
| { |
| if (pebs->tsx_tuning) { |
| union hsw_tsx_tuning tsx = { .value = pebs->tsx_tuning }; |
| return tsx.cycles_last_block; |
| } |
| return 0; |
| } |
| |
| static inline u64 intel_hsw_transaction(struct pebs_record_skl *pebs) |
| { |
| u64 txn = (pebs->tsx_tuning & PEBS_HSW_TSX_FLAGS) >> 32; |
| |
| /* For RTM XABORTs also log the abort code from AX */ |
| if ((txn & PERF_TXN_TRANSACTION) && (pebs->ax & 1)) |
| txn |= ((pebs->ax >> 24) & 0xff) << PERF_TXN_ABORT_SHIFT; |
| return txn; |
| } |
| |
| static void setup_pebs_sample_data(struct perf_event *event, |
| struct pt_regs *iregs, void *__pebs, |
| struct perf_sample_data *data, |
| struct pt_regs *regs) |
| { |
| #define PERF_X86_EVENT_PEBS_HSW_PREC \ |
| (PERF_X86_EVENT_PEBS_ST_HSW | \ |
| PERF_X86_EVENT_PEBS_LD_HSW | \ |
| PERF_X86_EVENT_PEBS_NA_HSW) |
| /* |
| * We cast to the biggest pebs_record but are careful not to |
| * unconditionally access the 'extra' entries. |
| */ |
| struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
| struct pebs_record_skl *pebs = __pebs; |
| u64 sample_type; |
| int fll, fst, dsrc; |
| int fl = event->hw.flags; |
| |
| if (pebs == NULL) |
| return; |
| |
| sample_type = event->attr.sample_type; |
| dsrc = sample_type & PERF_SAMPLE_DATA_SRC; |
| |
| fll = fl & PERF_X86_EVENT_PEBS_LDLAT; |
| fst = fl & (PERF_X86_EVENT_PEBS_ST | PERF_X86_EVENT_PEBS_HSW_PREC); |
| |
| perf_sample_data_init(data, 0, event->hw.last_period); |
| |
| data->period = event->hw.last_period; |
| |
| /* |
| * Use latency for weight (only avail with PEBS-LL) |
| */ |
| if (fll && (sample_type & PERF_SAMPLE_WEIGHT)) |
| data->weight = pebs->lat; |
| |
| /* |
| * data.data_src encodes the data source |
| */ |
| if (dsrc) { |
| u64 val = PERF_MEM_NA; |
| if (fll) |
| val = load_latency_data(pebs->dse); |
| else if (fst && (fl & PERF_X86_EVENT_PEBS_HSW_PREC)) |
| val = precise_datala_hsw(event, pebs->dse); |
| else if (fst) |
| val = precise_store_data(pebs->dse); |
| data->data_src.val = val; |
| } |
| |
| /* |
| * We use the interrupt regs as a base because the PEBS record |
| * does not contain a full regs set, specifically it seems to |
| * lack segment descriptors, which get used by things like |
| * user_mode(). |
| * |
| * In the simple case fix up only the IP and BP,SP regs, for |
| * PERF_SAMPLE_IP and PERF_SAMPLE_CALLCHAIN to function properly. |
| * A possible PERF_SAMPLE_REGS will have to transfer all regs. |
| */ |
| *regs = *iregs; |
| regs->flags = pebs->flags; |
| set_linear_ip(regs, pebs->ip); |
| regs->bp = pebs->bp; |
| regs->sp = pebs->sp; |
| |
| if (sample_type & PERF_SAMPLE_REGS_INTR) { |
| regs->ax = pebs->ax; |
| regs->bx = pebs->bx; |
| regs->cx = pebs->cx; |
| regs->dx = pebs->dx; |
| regs->si = pebs->si; |
| regs->di = pebs->di; |
| regs->bp = pebs->bp; |
| regs->sp = pebs->sp; |
| |
| regs->flags = pebs->flags; |
| #ifndef CONFIG_X86_32 |
| regs->r8 = pebs->r8; |
| regs->r9 = pebs->r9; |
| regs->r10 = pebs->r10; |
| regs->r11 = pebs->r11; |
| regs->r12 = pebs->r12; |
| regs->r13 = pebs->r13; |
| regs->r14 = pebs->r14; |
| regs->r15 = pebs->r15; |
| #endif |
| } |
| |
| if (event->attr.precise_ip > 1 && x86_pmu.intel_cap.pebs_format >= 2) { |
| regs->ip = pebs->real_ip; |
| regs->flags |= PERF_EFLAGS_EXACT; |
| } else if (event->attr.precise_ip > 1 && intel_pmu_pebs_fixup_ip(regs)) |
| regs->flags |= PERF_EFLAGS_EXACT; |
| else |
| regs->flags &= ~PERF_EFLAGS_EXACT; |
| |
| if ((sample_type & PERF_SAMPLE_ADDR) && |
| x86_pmu.intel_cap.pebs_format >= 1) |
| data->addr = pebs->dla; |
| |
| if (x86_pmu.intel_cap.pebs_format >= 2) { |
| /* Only set the TSX weight when no memory weight. */ |
| if ((sample_type & PERF_SAMPLE_WEIGHT) && !fll) |
| data->weight = intel_hsw_weight(pebs); |
| |
| if (sample_type & PERF_SAMPLE_TRANSACTION) |
| data->txn = intel_hsw_transaction(pebs); |
| } |
| |
| /* |
| * v3 supplies an accurate time stamp, so we use that |
| * for the time stamp. |
| * |
| * We can only do this for the default trace clock. |
| */ |
| if (x86_pmu.intel_cap.pebs_format >= 3 && |
| event->attr.use_clockid == 0) |
| data->time = native_sched_clock_from_tsc(pebs->tsc); |
| |
| if (has_branch_stack(event)) |
| data->br_stack = &cpuc->lbr_stack; |
| } |
| |
| static inline void * |
| get_next_pebs_record_by_bit(void *base, void *top, int bit) |
| { |
| struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
| void *at; |
| u64 pebs_status; |
| |
| /* |
| * fmt0 does not have a status bitfield (does not use |
| * perf_record_nhm format) |
| */ |
| if (x86_pmu.intel_cap.pebs_format < 1) |
| return base; |
| |
| if (base == NULL) |
| return NULL; |
| |
| for (at = base; at < top; at += x86_pmu.pebs_record_size) { |
| struct pebs_record_nhm *p = at; |
| |
| if (test_bit(bit, (unsigned long *)&p->status)) { |
| /* PEBS v3 has accurate status bits */ |
| if (x86_pmu.intel_cap.pebs_format >= 3) |
| return at; |
| |
| if (p->status == (1 << bit)) |
| return at; |
| |
| /* clear non-PEBS bit and re-check */ |
| pebs_status = p->status & cpuc->pebs_enabled; |
| pebs_status &= (1ULL << MAX_PEBS_EVENTS) - 1; |
| if (pebs_status == (1 << bit)) |
| return at; |
| } |
| } |
| return NULL; |
| } |
| |
| static void __intel_pmu_pebs_event(struct perf_event *event, |
| struct pt_regs *iregs, |
| void *base, void *top, |
| int bit, int count) |
| { |
| struct perf_sample_data data; |
| struct pt_regs regs; |
| void *at = get_next_pebs_record_by_bit(base, top, bit); |
| |
| if (!intel_pmu_save_and_restart(event) && |
| !(event->hw.flags & PERF_X86_EVENT_AUTO_RELOAD)) |
| return; |
| |
| while (count > 1) { |
| setup_pebs_sample_data(event, iregs, at, &data, ®s); |
| perf_event_output(event, &data, ®s); |
| at += x86_pmu.pebs_record_size; |
| at = get_next_pebs_record_by_bit(at, top, bit); |
| count--; |
| } |
| |
| setup_pebs_sample_data(event, iregs, at, &data, ®s); |
| |
| /* |
| * All but the last records are processed. |
| * The last one is left to be able to call the overflow handler. |
| */ |
| if (perf_event_overflow(event, &data, ®s)) { |
| x86_pmu_stop(event, 0); |
| return; |
| } |
| |
| } |
| |
| static void intel_pmu_drain_pebs_core(struct pt_regs *iregs) |
| { |
| struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
| struct debug_store *ds = cpuc->ds; |
| struct perf_event *event = cpuc->events[0]; /* PMC0 only */ |
| struct pebs_record_core *at, *top; |
| int n; |
| |
| if (!x86_pmu.pebs_active) |
| return; |
| |
| at = (struct pebs_record_core *)(unsigned long)ds->pebs_buffer_base; |
| top = (struct pebs_record_core *)(unsigned long)ds->pebs_index; |
| |
| /* |
| * Whatever else happens, drain the thing |
| */ |
| ds->pebs_index = ds->pebs_buffer_base; |
| |
| if (!test_bit(0, cpuc->active_mask)) |
| return; |
| |
| WARN_ON_ONCE(!event); |
| |
| if (!event->attr.precise_ip) |
| return; |
| |
| n = top - at; |
| if (n <= 0) |
| return; |
| |
| __intel_pmu_pebs_event(event, iregs, at, top, 0, n); |
| } |
| |
| static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs) |
| { |
| struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
| struct debug_store *ds = cpuc->ds; |
| struct perf_event *event; |
| void *base, *at, *top; |
| short counts[MAX_PEBS_EVENTS] = {}; |
| short error[MAX_PEBS_EVENTS] = {}; |
| int bit, i; |
| |
| if (!x86_pmu.pebs_active) |
| return; |
| |
| base = (struct pebs_record_nhm *)(unsigned long)ds->pebs_buffer_base; |
| top = (struct pebs_record_nhm *)(unsigned long)ds->pebs_index; |
| |
| ds->pebs_index = ds->pebs_buffer_base; |
| |
| if (unlikely(base >= top)) |
| return; |
| |
| for (at = base; at < top; at += x86_pmu.pebs_record_size) { |
| struct pebs_record_nhm *p = at; |
| u64 pebs_status; |
| |
| /* PEBS v3 has accurate status bits */ |
| if (x86_pmu.intel_cap.pebs_format >= 3) { |
| for_each_set_bit(bit, (unsigned long *)&p->status, |
| MAX_PEBS_EVENTS) |
| counts[bit]++; |
| |
| continue; |
| } |
| |
| pebs_status = p->status & cpuc->pebs_enabled; |
| pebs_status &= (1ULL << x86_pmu.max_pebs_events) - 1; |
| |
| /* |
| * On some CPUs the PEBS status can be zero when PEBS is |
| * racing with clearing of GLOBAL_STATUS. |
| * |
| * Normally we would drop that record, but in the |
| * case when there is only a single active PEBS event |
| * we can assume it's for that event. |
| */ |
| if (!pebs_status && cpuc->pebs_enabled && |
| !(cpuc->pebs_enabled & (cpuc->pebs_enabled-1))) |
| pebs_status = cpuc->pebs_enabled; |
| |
| bit = find_first_bit((unsigned long *)&pebs_status, |
| x86_pmu.max_pebs_events); |
| if (bit >= x86_pmu.max_pebs_events) |
| continue; |
| |
| /* |
| * The PEBS hardware does not deal well with the situation |
| * when events happen near to each other and multiple bits |
| * are set. But it should happen rarely. |
| * |
| * If these events include one PEBS and multiple non-PEBS |
| * events, it doesn't impact PEBS record. The record will |
| * be handled normally. (slow path) |
| * |
| * If these events include two or more PEBS events, the |
| * records for the events can be collapsed into a single |
| * one, and it's not possible to reconstruct all events |
| * that caused the PEBS record. It's called collision. |
| * If collision happened, the record will be dropped. |
| */ |
| if (p->status != (1ULL << bit)) { |
| for_each_set_bit(i, (unsigned long *)&pebs_status, |
| x86_pmu.max_pebs_events) |
| error[i]++; |
| continue; |
| } |
| |
| counts[bit]++; |
| } |
| |
| for (bit = 0; bit < x86_pmu.max_pebs_events; bit++) { |
| if ((counts[bit] == 0) && (error[bit] == 0)) |
| continue; |
| |
| event = cpuc->events[bit]; |
| WARN_ON_ONCE(!event); |
| WARN_ON_ONCE(!event->attr.precise_ip); |
| |
| /* log dropped samples number */ |
| if (error[bit]) |
| perf_log_lost_samples(event, error[bit]); |
| |
| if (counts[bit]) { |
| __intel_pmu_pebs_event(event, iregs, base, |
| top, bit, counts[bit]); |
| } |
| } |
| } |
| |
| /* |
| * BTS, PEBS probe and setup |
| */ |
| |
| void __init intel_ds_init(void) |
| { |
| /* |
| * No support for 32bit formats |
| */ |
| if (!boot_cpu_has(X86_FEATURE_DTES64)) |
| return; |
| |
| x86_pmu.bts = boot_cpu_has(X86_FEATURE_BTS); |
| x86_pmu.pebs = boot_cpu_has(X86_FEATURE_PEBS); |
| if (x86_pmu.pebs) { |
| char pebs_type = x86_pmu.intel_cap.pebs_trap ? '+' : '-'; |
| int format = x86_pmu.intel_cap.pebs_format; |
| |
| switch (format) { |
| case 0: |
| pr_cont("PEBS fmt0%c, ", pebs_type); |
| x86_pmu.pebs_record_size = sizeof(struct pebs_record_core); |
| x86_pmu.drain_pebs = intel_pmu_drain_pebs_core; |
| break; |
| |
| case 1: |
| pr_cont("PEBS fmt1%c, ", pebs_type); |
| x86_pmu.pebs_record_size = sizeof(struct pebs_record_nhm); |
| x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm; |
| break; |
| |
| case 2: |
| pr_cont("PEBS fmt2%c, ", pebs_type); |
| x86_pmu.pebs_record_size = sizeof(struct pebs_record_hsw); |
| x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm; |
| break; |
| |
| case 3: |
| pr_cont("PEBS fmt3%c, ", pebs_type); |
| x86_pmu.pebs_record_size = |
| sizeof(struct pebs_record_skl); |
| x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm; |
| x86_pmu.free_running_flags |= PERF_SAMPLE_TIME; |
| break; |
| |
| default: |
| pr_cont("no PEBS fmt%d%c, ", format, pebs_type); |
| x86_pmu.pebs = 0; |
| } |
| } |
| } |
| |
| void perf_restore_debug_store(void) |
| { |
| struct debug_store *ds = __this_cpu_read(cpu_hw_events.ds); |
| |
| if (!x86_pmu.bts && !x86_pmu.pebs) |
| return; |
| |
| wrmsrl(MSR_IA32_DS_AREA, (unsigned long)ds); |
| } |