diff options
Diffstat (limited to 'arch/arm/oprofile')
| -rw-r--r-- | arch/arm/oprofile/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/oprofile/common.c | 4 | ||||
| -rw-r--r-- | arch/arm/oprofile/op_arm_model.h | 1 | ||||
| -rw-r--r-- | arch/arm/oprofile/op_model_v7.c | 411 | ||||
| -rw-r--r-- | arch/arm/oprofile/op_model_v7.h | 103 |
5 files changed, 520 insertions, 0 deletions
diff --git a/arch/arm/oprofile/Makefile b/arch/arm/oprofile/Makefile index e61d0cc520b..88e31f549f5 100644 --- a/arch/arm/oprofile/Makefile +++ b/arch/arm/oprofile/Makefile @@ -11,3 +11,4 @@ oprofile-$(CONFIG_CPU_XSCALE) += op_model_xscale.o oprofile-$(CONFIG_OPROFILE_ARM11_CORE) += op_model_arm11_core.o oprofile-$(CONFIG_OPROFILE_ARMV6) += op_model_v6.o oprofile-$(CONFIG_OPROFILE_MPCORE) += op_model_mpcore.o +oprofile-$(CONFIG_OPROFILE_ARMV7) += op_model_v7.o diff --git a/arch/arm/oprofile/common.c b/arch/arm/oprofile/common.c index 0a5cf3a6438..3fcd752d614 100644 --- a/arch/arm/oprofile/common.c +++ b/arch/arm/oprofile/common.c @@ -145,6 +145,10 @@ int __init oprofile_arch_init(struct oprofile_operations *ops) spec = &op_mpcore_spec; #endif +#ifdef CONFIG_OPROFILE_ARMV7 + spec = &op_armv7_spec; +#endif + if (spec) { ret = spec->init(); if (ret < 0) diff --git a/arch/arm/oprofile/op_arm_model.h b/arch/arm/oprofile/op_arm_model.h index 4899c629aa0..8c4e4f6a1de 100644 --- a/arch/arm/oprofile/op_arm_model.h +++ b/arch/arm/oprofile/op_arm_model.h @@ -26,6 +26,7 @@ extern struct op_arm_model_spec op_xscale_spec; extern struct op_arm_model_spec op_armv6_spec; extern struct op_arm_model_spec op_mpcore_spec; +extern struct op_arm_model_spec op_armv7_spec; extern void arm_backtrace(struct pt_regs * const regs, unsigned int depth); diff --git a/arch/arm/oprofile/op_model_v7.c b/arch/arm/oprofile/op_model_v7.c new file mode 100644 index 00000000000..f20295f14ad --- /dev/null +++ b/arch/arm/oprofile/op_model_v7.c @@ -0,0 +1,411 @@ +/** + * op_model_v7.c + * ARM V7 (Cortex A8) Event Monitor Driver + * + * Copyright 2008 Jean Pihet <jpihet@mvista.com> + * Copyright 2004 ARM SMP Development Team + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/oprofile.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/smp.h> + +#include "op_counter.h" +#include "op_arm_model.h" +#include "op_model_v7.h" + +/* #define DEBUG */ + + +/* + * ARM V7 PMNC support + */ + +static u32 cnt_en[CNTMAX]; + +static inline void armv7_pmnc_write(u32 val) +{ + val &= PMNC_MASK; + asm volatile("mcr p15, 0, %0, c9, c12, 0" : : "r" (val)); +} + +static inline u32 armv7_pmnc_read(void) +{ + u32 val; + + asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r" (val)); + return val; +} + +static inline u32 armv7_pmnc_enable_counter(unsigned int cnt) +{ + u32 val; + + if (cnt >= CNTMAX) { + printk(KERN_ERR "oprofile: CPU%u enabling wrong PMNC counter" + " %d\n", smp_processor_id(), cnt); + return -1; + } + + if (cnt == CCNT) + val = CNTENS_C; + else + val = (1 << (cnt - CNT0)); + + val &= CNTENS_MASK; + asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (val)); + + return cnt; +} + +static inline u32 armv7_pmnc_disable_counter(unsigned int cnt) +{ + u32 val; + + if (cnt >= CNTMAX) { + printk(KERN_ERR "oprofile: CPU%u disabling wrong PMNC counter" + " %d\n", smp_processor_id(), cnt); + return -1; + } + + if (cnt == CCNT) + val = CNTENC_C; + else + val = (1 << (cnt - CNT0)); + + val &= CNTENC_MASK; + asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (val)); + + return cnt; +} + +static inline u32 armv7_pmnc_enable_intens(unsigned int cnt) +{ + u32 val; + + if (cnt >= CNTMAX) { + printk(KERN_ERR "oprofile: CPU%u enabling wrong PMNC counter" + " interrupt enable %d\n", smp_processor_id(), cnt); + return -1; + } + + if (cnt == CCNT) + val = INTENS_C; + else + val = (1 << (cnt - CNT0)); + + val &= INTENS_MASK; + asm volatile("mcr p15, 0, %0, c9, c14, 1" : : "r" (val)); + + return cnt; +} + +static inline u32 armv7_pmnc_getreset_flags(void) +{ + u32 val; + + /* Read */ + asm volatile("mrc p15, 0, %0, c9, c12, 3" : "=r" (val)); + + /* Write to clear flags */ + val &= FLAG_MASK; + asm volatile("mcr p15, 0, %0, c9, c12, 3" : : "r" (val)); + + return val; +} + +static inline int armv7_pmnc_select_counter(unsigned int cnt) +{ + u32 val; + + if ((cnt == CCNT) || (cnt >= CNTMAX)) { + printk(KERN_ERR "oprofile: CPU%u selecting wrong PMNC counteri" + " %d\n", smp_processor_id(), cnt); + return -1; + } + + val = (cnt - CNT0) & SELECT_MASK; + asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r" (val)); + + return cnt; +} + +static inline void armv7_pmnc_write_evtsel(unsigned int cnt, u32 val) +{ + if (armv7_pmnc_select_counter(cnt) == cnt) { + val &= EVTSEL_MASK; + asm volatile("mcr p15, 0, %0, c9, c13, 1" : : "r" (val)); + } +} + +static void armv7_pmnc_reset_counter(unsigned int cnt) +{ + u32 cpu_cnt = CPU_COUNTER(smp_processor_id(), cnt); + u32 val = -(u32)counter_config[cpu_cnt].count; + + switch (cnt) { + case CCNT: + armv7_pmnc_disable_counter(cnt); + + asm volatile("mcr p15, 0, %0, c9, c13, 0" : : "r" (val)); + + if (cnt_en[cnt] != 0) + armv7_pmnc_enable_counter(cnt); + + break; + + case CNT0: + case CNT1: + case CNT2: + case CNT3: + armv7_pmnc_disable_counter(cnt); + + if (armv7_pmnc_select_counter(cnt) == cnt) + asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r" (val)); + + if (cnt_en[cnt] != 0) + armv7_pmnc_enable_counter(cnt); + + break; + + default: + printk(KERN_ERR "oprofile: CPU%u resetting wrong PMNC counter" + " %d\n", smp_processor_id(), cnt); + break; + } +} + +int armv7_setup_pmnc(void) +{ + unsigned int cnt; + + if (armv7_pmnc_read() & PMNC_E) { + printk(KERN_ERR "oprofile: CPU%u PMNC still enabled when setup" + " new event counter.\n", smp_processor_id()); + return -EBUSY; + } + + /* + * Initialize & Reset PMNC: C bit, D bit and P bit. + * Note: Using a slower count for CCNT (D bit: divide by 64) results + * in a more stable system + */ + armv7_pmnc_write(PMNC_P | PMNC_C | PMNC_D); + + + for (cnt = CCNT; cnt < CNTMAX; cnt++) { + unsigned long event; + u32 cpu_cnt = CPU_COUNTER(smp_processor_id(), cnt); + + /* + * Disable counter + */ + armv7_pmnc_disable_counter(cnt); + cnt_en[cnt] = 0; + + if (!counter_config[cpu_cnt].enabled) + continue; + + event = counter_config[cpu_cnt].event & 255; + + /* + * Set event (if destined for PMNx counters) + * We don't need to set the event if it's a cycle count + */ + if (cnt != CCNT) + armv7_pmnc_write_evtsel(cnt, event); + + /* + * Enable interrupt for this counter + */ + armv7_pmnc_enable_intens(cnt); + + /* + * Reset counter + */ + armv7_pmnc_reset_counter(cnt); + + /* + * Enable counter + */ + armv7_pmnc_enable_counter(cnt); + cnt_en[cnt] = 1; + } + + return 0; +} + +static inline void armv7_start_pmnc(void) +{ + armv7_pmnc_write(armv7_pmnc_read() | PMNC_E); +} + +static inline void armv7_stop_pmnc(void) +{ + armv7_pmnc_write(armv7_pmnc_read() & ~PMNC_E); +} + +/* + * CPU counters' IRQ handler (one IRQ per CPU) + */ +static irqreturn_t armv7_pmnc_interrupt(int irq, void *arg) +{ + struct pt_regs *regs = get_irq_regs(); + unsigned int cnt; + u32 flags; + + + /* + * Stop IRQ generation + */ + armv7_stop_pmnc(); + + /* + * Get and reset overflow status flags + */ + flags = armv7_pmnc_getreset_flags(); + + /* + * Cycle counter + */ + if (flags & FLAG_C) { + u32 cpu_cnt = CPU_COUNTER(smp_processor_id(), CCNT); + armv7_pmnc_reset_counter(CCNT); + oprofile_add_sample(regs, cpu_cnt); + } + + /* + * PMNC counters 0:3 + */ + for (cnt = CNT0; cnt < CNTMAX; cnt++) { + if (flags & (1 << (cnt - CNT0))) { + u32 cpu_cnt = CPU_COUNTER(smp_processor_id(), cnt); + armv7_pmnc_reset_counter(cnt); + oprofile_add_sample(regs, cpu_cnt); + } + } + + /* + * Allow IRQ generation + */ + armv7_start_pmnc(); + + return IRQ_HANDLED; +} + +int armv7_request_interrupts(int *irqs, int nr) +{ + unsigned int i; + int ret = 0; + + for (i = 0; i < nr; i++) { + ret = request_irq(irqs[i], armv7_pmnc_interrupt, + IRQF_DISABLED, "CP15 PMNC", NULL); + if (ret != 0) { + printk(KERN_ERR "oprofile: unable to request IRQ%u" + " for ARMv7\n", + irqs[i]); + break; + } + } + + if (i != nr) + while (i-- != 0) + free_irq(irqs[i], NULL); + + return ret; +} + +void armv7_release_interrupts(int *irqs, int nr) +{ + unsigned int i; + + for (i = 0; i < nr; i++) + free_irq(irqs[i], NULL); +} + +#ifdef DEBUG +static void armv7_pmnc_dump_regs(void) +{ + u32 val; + unsigned int cnt; + + printk(KERN_INFO "PMNC registers dump:\n"); + + asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r" (val)); + printk(KERN_INFO "PMNC =0x%08x\n", val); + + asm volatile("mrc p15, 0, %0, c9, c12, 1" : "=r" (val)); + printk(KERN_INFO "CNTENS=0x%08x\n", val); + + asm volatile("mrc p15, 0, %0, c9, c14, 1" : "=r" (val)); + printk(KERN_INFO "INTENS=0x%08x\n", val); + + asm volatile("mrc p15, 0, %0, c9, c12, 3" : "=r" (val)); + printk(KERN_INFO "FLAGS =0x%08x\n", val); + + asm volatile("mrc p15, 0, %0, c9, c12, 5" : "=r" (val)); + printk(KERN_INFO "SELECT=0x%08x\n", val); + + asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (val)); + printk(KERN_INFO "CCNT =0x%08x\n", val); + + for (cnt = CNT0; cnt < CNTMAX; cnt++) { + armv7_pmnc_select_counter(cnt); + asm volatile("mrc p15, 0, %0, c9, c13, 2" : "=r" (val)); + printk(KERN_INFO "CNT[%d] count =0x%08x\n", cnt-CNT0, val); + asm volatile("mrc p15, 0, %0, c9, c13, 1" : "=r" (val)); + printk(KERN_INFO "CNT[%d] evtsel=0x%08x\n", cnt-CNT0, val); + } +} +#endif + + +static int irqs[] = { +#ifdef CONFIG_ARCH_OMAP3 + INT_34XX_BENCH_MPU_EMUL, +#endif +}; + +static void armv7_pmnc_stop(void) +{ +#ifdef DEBUG + armv7_pmnc_dump_regs(); +#endif + armv7_stop_pmnc(); + armv7_release_interrupts(irqs, ARRAY_SIZE(irqs)); +} + +static int armv7_pmnc_start(void) +{ + int ret; + +#ifdef DEBUG + armv7_pmnc_dump_regs(); +#endif + ret = armv7_request_interrupts(irqs, ARRAY_SIZE(irqs)); + if (ret >= 0) + armv7_start_pmnc(); + + return ret; +} + +static int armv7_detect_pmnc(void) +{ + return 0; +} + +struct op_arm_model_spec op_armv7_spec = { + .init = armv7_detect_pmnc, + .num_counters = 5, + .setup_ctrs = armv7_setup_pmnc, + .start = armv7_pmnc_start, + .stop = armv7_pmnc_stop, + .name = "arm/armv7", +}; diff --git a/arch/arm/oprofile/op_model_v7.h b/arch/arm/oprofile/op_model_v7.h new file mode 100644 index 00000000000..0e19bcc2e10 --- /dev/null +++ b/arch/arm/oprofile/op_model_v7.h @@ -0,0 +1,103 @@ +/** + * op_model_v7.h + * ARM v7 (Cortex A8) Event Monitor Driver + * + * Copyright 2008 Jean Pihet <jpihet@mvista.com> + * Copyright 2004 ARM SMP Development Team + * Copyright 2000-2004 Deepak Saxena <dsaxena@mvista.com> + * Copyright 2000-2004 MontaVista Software Inc + * Copyright 2004 Dave Jiang <dave.jiang@intel.com> + * Copyright 2004 Intel Corporation + * Copyright 2004 Zwane Mwaikambo <zwane@arm.linux.org.uk> + * Copyright 2004 Oprofile Authors + * + * Read the file COPYING + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#ifndef OP_MODEL_V7_H +#define OP_MODEL_V7_H + +/* + * Per-CPU PMNC: config reg + */ +#define PMNC_E (1 << 0) /* Enable all counters */ +#define PMNC_P (1 << 1) /* Reset all counters */ +#define PMNC_C (1 << 2) /* Cycle counter reset */ +#define PMNC_D (1 << 3) /* CCNT counts every 64th cpu cycle */ +#define PMNC_X (1 << 4) /* Export to ETM */ +#define PMNC_DP (1 << 5) /* Disable CCNT if non-invasive debug*/ +#define PMNC_MASK 0x3f /* Mask for writable bits */ + +/* + * Available counters + */ +#define CCNT 0 +#define CNT0 1 +#define CNT1 2 +#define CNT2 3 +#define CNT3 4 +#define CNTMAX 5 + +#define CPU_COUNTER(cpu, counter) ((cpu) * CNTMAX + (counter)) + +/* + * CNTENS: counters enable reg + */ +#define CNTENS_P0 (1 << 0) +#define CNTENS_P1 (1 << 1) +#define CNTENS_P2 (1 << 2) +#define CNTENS_P3 (1 << 3) +#define CNTENS_C (1 << 31) +#define CNTENS_MASK 0x8000000f /* Mask for writable bits */ + +/* + * CNTENC: counters disable reg + */ +#define CNTENC_P0 (1 << 0) +#define CNTENC_P1 (1 << 1) +#define CNTENC_P2 (1 << 2) +#define CNTENC_P3 (1 << 3) +#define CNTENC_C (1 << 31) +#define CNTENC_MASK 0x8000000f /* Mask for writable bits */ + +/* + * INTENS: counters overflow interrupt enable reg + */ +#define INTENS_P0 (1 << 0) +#define INTENS_P1 (1 << 1) +#define INTENS_P2 (1 << 2) +#define INTENS_P3 (1 << 3) +#define INTENS_C (1 << 31) +#define INTENS_MASK 0x8000000f /* Mask for writable bits */ + +/* + * EVTSEL: Event selection reg + */ +#define EVTSEL_MASK 0x7f /* Mask for writable bits */ + +/* + * SELECT: Counter selection reg + */ +#define SELECT_MASK 0x1f /* Mask for writable bits */ + +/* + * FLAG: counters overflow flag status reg + */ +#define FLAG_P0 (1 << 0) +#define FLAG_P1 (1 << 1) +#define FLAG_P2 (1 << 2) +#define FLAG_P3 (1 << 3) +#define FLAG_C (1 << 31) +#define FLAG_MASK 0x8000000f /* Mask for writable bits */ + + +int armv7_setup_pmu(void); +int armv7_start_pmu(void); +int armv7_stop_pmu(void); +int armv7_request_interrupts(int *, int); +void armv7_release_interrupts(int *, int); + +#endif |