From 75b824727680a9d12c34d78096a5ac642e53f5d0 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Thu, 15 Dec 2016 13:42:18 +0100 Subject: [PATCH] powerpc/8xx: Perf events on PPC 8xx This patch has been reworked since RFC version. In the RFC, this patch was preceded by a patch clearing MSR RI for all PPC32 at all time at exception prologs. Now MSR RI clearing is done only when this 8xx perf events functionality is compiled in, it is therefore limited to 8xx and merged inside this patch. Other main changes have been to take into account detailed review from Peter Zijlstra. The instructions counter has been reworked to behave as a free running counter like the three other counters. The 8xx has no PMU, however some events can be emulated by other means. This patch implements the following events (as reported by 'perf list'): cpu-cycles OR cycles [Hardware event] instructions [Hardware event] dTLB-load-misses [Hardware cache event] iTLB-load-misses [Hardware cache event] 'cycles' event is implemented using the timebase clock. Timebase clock corresponds to CPU clock divided by 16, so number of cycles is approximatly 16 times the number of TB ticks On the 8xx, TLB misses are handled by software. It is therefore easy to count all TLB misses each time the TLB miss exception is called. 'instructions' is calculated by using instruction watchpoint counter. This patch sets counter A to count instructions at address greater than 0, hence we count all instructions executed while MSR RI bit is set. The counter is set to the maximum which is 0xffff. Every 65535 instructions, debug instruction breakpoint exception fires. The exception handler increments a counter in memory which then represent the upper part of the instruction counter. We therefore end up with a 48 bits counter. In order to avoid unnecessary overhead while no perf event is active, this counter is started when the first event referring to this counter is added, and the counter is stopped when the last event referring to it is deleted. In order to properly support breakpoint exceptions, MSR RI bit has to be unset in exception epilogs in order to avoid breakpoint exceptions during critical sections during changes to SRR0 and SRR1 would be problematic. All counters are handled as free running counters. Signed-off-by: Christophe Leroy Signed-off-by: Scott Wood --- arch/powerpc/include/asm/reg.h | 2 + arch/powerpc/include/asm/reg_8xx.h | 4 + arch/powerpc/kernel/entry_32.S | 15 +++ arch/powerpc/kernel/head_8xx.S | 46 ++++++++- arch/powerpc/perf/8xx-pmu.c | 173 +++++++++++++++++++++++++++++++++ arch/powerpc/perf/Makefile | 2 + arch/powerpc/platforms/Kconfig.cputype | 7 ++ 7 files changed, 248 insertions(+), 1 deletion(-) create mode 100644 arch/powerpc/perf/8xx-pmu.c diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index 0d4531a..9098b35 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -548,7 +548,9 @@ #define SPRN_IBAT7U 0x236 /* Instruction BAT 7 Upper Register */ #define SPRN_ICMP 0x3D5 /* Instruction TLB Compare Register */ #define SPRN_ICTC 0x3FB /* Instruction Cache Throttling Control Reg */ +#ifndef SPRN_ICTRL #define SPRN_ICTRL 0x3F3 /* 1011 7450 icache and interrupt ctrl */ +#endif #define ICTRL_EICE 0x08000000 /* enable icache parity errs */ #define ICTRL_EDC 0x04000000 /* enable dcache parity errs */ #define ICTRL_EICP 0x00000100 /* enable icache par. check */ diff --git a/arch/powerpc/include/asm/reg_8xx.h b/arch/powerpc/include/asm/reg_8xx.h index c52725b..ae16fef 100644 --- a/arch/powerpc/include/asm/reg_8xx.h +++ b/arch/powerpc/include/asm/reg_8xx.h @@ -28,12 +28,16 @@ /* Special MSR manipulation registers */ #define SPRN_EIE 80 /* External interrupt enable (EE=1, RI=1) */ #define SPRN_EID 81 /* External interrupt disable (EE=0, RI=1) */ +#define SPRN_NRI 82 /* Non recoverable interrupt (EE=0, RI=0) */ /* Debug registers */ +#define SPRN_CMPA 144 +#define SPRN_COUNTA 150 #define SPRN_CMPE 152 #define SPRN_CMPF 153 #define SPRN_LCTRL1 156 #define SPRN_LCTRL2 157 +#define SPRN_ICTRL 158 #define SPRN_BAR 159 /* Commands. Only the first few are available to the instruction cache. diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 980626a..f3e4fc1 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -205,6 +205,9 @@ transfer_to_handler_cont: mflr r9 lwz r11,0(r9) /* virtual address of handler */ lwz r9,4(r9) /* where to go when done */ +#ifdef CONFIG_PPC_8xx_PERF_EVENT + mtspr SPRN_NRI, r0 +#endif #ifdef CONFIG_TRACE_IRQFLAGS lis r12,reenable_mmu@h ori r12,r12,reenable_mmu@l @@ -292,6 +295,9 @@ stack_ovf: lis r9,StackOverflow@ha addi r9,r9,StackOverflow@l LOAD_MSR_KERNEL(r10,MSR_KERNEL) +#ifdef CONFIG_PPC_8xx_PERF_EVENT + mtspr SPRN_NRI, r0 +#endif mtspr SPRN_SRR0,r9 mtspr SPRN_SRR1,r10 SYNC @@ -418,6 +424,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX) lwz r7,_NIP(r1) lwz r2,GPR2(r1) lwz r1,GPR1(r1) +#ifdef CONFIG_PPC_8xx_PERF_EVENT + mtspr SPRN_NRI, r0 +#endif mtspr SPRN_SRR0,r7 mtspr SPRN_SRR1,r8 SYNC @@ -701,6 +710,9 @@ fast_exception_return: lwz r10,_LINK(r11) mtlr r10 REST_GPR(10, r11) +#ifdef CONFIG_PPC_8xx_PERF_EVENT + mtspr SPRN_NRI, r0 +#endif mtspr SPRN_SRR1,r9 mtspr SPRN_SRR0,r12 REST_GPR(9, r11) @@ -949,6 +961,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX) .globl exc_exit_restart exc_exit_restart: lwz r12,_NIP(r1) +#ifdef CONFIG_PPC_8xx_PERF_EVENT + mtspr SPRN_NRI, r0 +#endif mtspr SPRN_SRR0,r12 mtspr SPRN_SRR1,r9 REST_4GPRS(9, r1) diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 5fcbd79..c032fe8c 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -329,6 +329,12 @@ InstructionTLBMiss: mtspr SPRN_SPRG_SCRATCH2, r3 #endif EXCEPTION_PROLOG_0 +#ifdef CONFIG_PPC_8xx_PERF_EVENT + lis r10, (itlb_miss_counter - PAGE_OFFSET)@ha + lwz r11, (itlb_miss_counter - PAGE_OFFSET)@l(r10) + addi r11, r11, 1 + stw r11, (itlb_miss_counter - PAGE_OFFSET)@l(r10) +#endif /* If we are faulting a kernel address, we have to use the * kernel page tables. @@ -429,6 +435,12 @@ InstructionTLBMiss: DataStoreTLBMiss: mtspr SPRN_SPRG_SCRATCH2, r3 EXCEPTION_PROLOG_0 +#ifdef CONFIG_PPC_8xx_PERF_EVENT + lis r10, (dtlb_miss_counter - PAGE_OFFSET)@ha + lwz r11, (dtlb_miss_counter - PAGE_OFFSET)@l(r10) + addi r11, r11, 1 + stw r11, (dtlb_miss_counter - PAGE_OFFSET)@l(r10) +#endif mfcr r3 /* If we are faulting a kernel address, we have to use the @@ -625,7 +637,22 @@ DataBreakpoint: EXCEPTION_EPILOG_0 rfi +#ifdef CONFIG_PPC_8xx_PERF_EVENT + . = 0x1d00 +InstructionBreakpoint: + EXCEPTION_PROLOG_0 + lis r10, (instruction_counter - PAGE_OFFSET)@ha + lwz r11, (instruction_counter - PAGE_OFFSET)@l(r10) + addi r11, r11, -1 + stw r11, (instruction_counter - PAGE_OFFSET)@l(r10) + lis r10, 0xffff + ori r10, r10, 0x01 + mtspr SPRN_COUNTA, r10 + EXCEPTION_EPILOG_0 + rfi +#else EXCEPTION(0x1d00, Trap_1d, unknown_exception, EXC_XFER_EE) +#endif EXCEPTION(0x1e00, Trap_1e, unknown_exception, EXC_XFER_EE) EXCEPTION(0x1f00, Trap_1f, unknown_exception, EXC_XFER_EE) @@ -999,9 +1026,13 @@ initial_mmu: lis r8, IDC_ENABLE@h mtspr SPRN_DC_CST, r8 #endif - /* Disable debug mode entry on data breakpoints */ + /* Disable debug mode entry on breakpoints */ mfspr r8, SPRN_DER +#ifdef CONFIG_PPC_8xx_PERF_EVENT + rlwinm r8, r8, 0, ~0xc +#else rlwinm r8, r8, 0, ~0x8 +#endif mtspr SPRN_DER, r8 blr @@ -1036,3 +1067,16 @@ cpu6_errata_word: .space 16 #endif +#ifdef CONFIG_PPC_8xx_PERF_EVENT + .globl itlb_miss_counter +itlb_miss_counter: + .space 4 + + .globl dtlb_miss_counter +dtlb_miss_counter: + .space 4 + + .globl instruction_counter +instruction_counter: + .space 4 +#endif diff --git a/arch/powerpc/perf/8xx-pmu.c b/arch/powerpc/perf/8xx-pmu.c new file mode 100644 index 0000000..3c39f05 --- /dev/null +++ b/arch/powerpc/perf/8xx-pmu.c @@ -0,0 +1,173 @@ +/* + * Performance event support - PPC 8xx + * + * Copyright 2016 Christophe Leroy, CS Systemes d'Information + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define PERF_8xx_ID_CPU_CYCLES 1 +#define PERF_8xx_ID_HW_INSTRUCTIONS 2 +#define PERF_8xx_ID_ITLB_LOAD_MISS 3 +#define PERF_8xx_ID_DTLB_LOAD_MISS 4 + +#define C(x) PERF_COUNT_HW_CACHE_##x +#define DTLB_LOAD_MISS (C(DTLB) | (C(OP_READ) << 8) | (C(RESULT_MISS) << 16)) +#define ITLB_LOAD_MISS (C(ITLB) | (C(OP_READ) << 8) | (C(RESULT_MISS) << 16)) + +extern unsigned long itlb_miss_counter, dtlb_miss_counter; +extern atomic_t instruction_counter; + +static atomic_t insn_ctr_ref; + +static s64 get_insn_ctr(void) +{ + int ctr; + unsigned long counta; + + do { + ctr = atomic_read(&instruction_counter); + counta = mfspr(SPRN_COUNTA); + } while (ctr != atomic_read(&instruction_counter)); + + return ((s64)ctr << 16) | (counta >> 16); +} + +static int event_type(struct perf_event *event) +{ + switch (event->attr.type) { + case PERF_TYPE_HARDWARE: + if (event->attr.config == PERF_COUNT_HW_CPU_CYCLES) + return PERF_8xx_ID_CPU_CYCLES; + if (event->attr.config == PERF_COUNT_HW_INSTRUCTIONS) + return PERF_8xx_ID_HW_INSTRUCTIONS; + break; + case PERF_TYPE_HW_CACHE: + if (event->attr.config == ITLB_LOAD_MISS) + return PERF_8xx_ID_ITLB_LOAD_MISS; + if (event->attr.config == DTLB_LOAD_MISS) + return PERF_8xx_ID_DTLB_LOAD_MISS; + break; + case PERF_TYPE_RAW: + break; + default: + return -ENOENT; + } + return -EOPNOTSUPP; +} + +static int mpc8xx_pmu_event_init(struct perf_event *event) +{ + int type = event_type(event); + + if (type < 0) + return type; + return 0; +} + +static int mpc8xx_pmu_add(struct perf_event *event, int flags) +{ + int type = event_type(event); + s64 val = 0; + + if (type < 0) + return type; + + switch (type) { + case PERF_8xx_ID_CPU_CYCLES: + val = get_tb(); + break; + case PERF_8xx_ID_HW_INSTRUCTIONS: + if (atomic_inc_return(&insn_ctr_ref) == 1) + mtspr(SPRN_ICTRL, 0xc0080007); + val = get_insn_ctr(); + break; + case PERF_8xx_ID_ITLB_LOAD_MISS: + val = itlb_miss_counter; + break; + case PERF_8xx_ID_DTLB_LOAD_MISS: + val = dtlb_miss_counter; + break; + } + local64_set(&event->hw.prev_count, val); + return 0; +} + +static void mpc8xx_pmu_read(struct perf_event *event) +{ + int type = event_type(event); + s64 prev, val = 0, delta = 0; + + if (type < 0) + return; + + do { + prev = local64_read(&event->hw.prev_count); + switch (type) { + case PERF_8xx_ID_CPU_CYCLES: + val = get_tb(); + delta = 16 * (val - prev); + break; + case PERF_8xx_ID_HW_INSTRUCTIONS: + val = get_insn_ctr(); + delta = prev - val; + if (delta < 0) + delta += 0x1000000000000LL; + break; + case PERF_8xx_ID_ITLB_LOAD_MISS: + val = itlb_miss_counter; + delta = (s64)((s32)val - (s32)prev); + break; + case PERF_8xx_ID_DTLB_LOAD_MISS: + val = dtlb_miss_counter; + delta = (s64)((s32)val - (s32)prev); + break; + } + } while (local64_cmpxchg(&event->hw.prev_count, prev, val) != prev); + + local64_add(delta, &event->count); +} + +static void mpc8xx_pmu_del(struct perf_event *event, int flags) +{ + mpc8xx_pmu_read(event); + if (event_type(event) != PERF_8xx_ID_HW_INSTRUCTIONS) + return; + + /* If it was the last user, stop counting to avoid useles overhead */ + if (atomic_dec_return(&insn_ctr_ref) == 0) + mtspr(SPRN_ICTRL, 7); +} + +static struct pmu mpc8xx_pmu = { + .event_init = mpc8xx_pmu_event_init, + .add = mpc8xx_pmu_add, + .del = mpc8xx_pmu_del, + .read = mpc8xx_pmu_read, + .capabilities = PERF_PMU_CAP_NO_INTERRUPT | + PERF_PMU_CAP_NO_NMI, +}; + +static int init_mpc8xx_pmu(void) +{ + mtspr(SPRN_ICTRL, 7); + mtspr(SPRN_CMPA, 0); + mtspr(SPRN_COUNTA, 0xffff); + + return perf_pmu_register(&mpc8xx_pmu, "cpu", PERF_TYPE_RAW); +} + +early_initcall(init_mpc8xx_pmu); diff --git a/arch/powerpc/perf/Makefile b/arch/powerpc/perf/Makefile index f102d53..4d606b9 100644 --- a/arch/powerpc/perf/Makefile +++ b/arch/powerpc/perf/Makefile @@ -13,5 +13,7 @@ obj-$(CONFIG_FSL_EMB_PERF_EVENT_E500) += e500-pmu.o e6500-pmu.o obj-$(CONFIG_HV_PERF_CTRS) += hv-24x7.o hv-gpci.o hv-common.o +obj-$(CONFIG_PPC_8xx_PERF_EVENT) += 8xx-pmu.o + obj-$(CONFIG_PPC64) += $(obj64-y) obj-$(CONFIG_PPC32) += $(obj32-y) diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index 6e89e5a..99b0ae8 100644 --- a/arch/powerpc/platforms/Kconfig.cputype +++ b/arch/powerpc/platforms/Kconfig.cputype @@ -172,6 +172,13 @@ config PPC_FPU bool default y if PPC64 +config PPC_8xx_PERF_EVENT + bool "PPC 8xx perf events" + depends on PPC_8xx && PERF_EVENTS + help + This is Performance Events support for PPC 8xx. The 8xx doesn't + have a PMU but some events are emulated using 8xx features. + config FSL_EMB_PERFMON bool "Freescale Embedded Perfmon" depends on E500 || PPC_83xx -- 2.7.4