diff options
Diffstat (limited to 'arch/mips/oprofile')
| -rw-r--r-- | arch/mips/oprofile/Kconfig | 23 | ||||
| -rw-r--r-- | arch/mips/oprofile/Makefile | 15 | ||||
| -rw-r--r-- | arch/mips/oprofile/common.c | 106 | ||||
| -rw-r--r-- | arch/mips/oprofile/op_impl.h | 37 | ||||
| -rw-r--r-- | arch/mips/oprofile/op_model_rm9000.c | 137 |
5 files changed, 318 insertions, 0 deletions
diff --git a/arch/mips/oprofile/Kconfig b/arch/mips/oprofile/Kconfig new file mode 100644 index 000000000000..19d37730b664 --- /dev/null +++ b/arch/mips/oprofile/Kconfig @@ -0,0 +1,23 @@ + +menu "Profiling support" + depends on EXPERIMENTAL + +config PROFILING + bool "Profiling support (EXPERIMENTAL)" + help + Say Y here to enable the extended profiling support mechanisms used + by profilers such as OProfile. + + +config OPROFILE + tristate "OProfile system profiling (EXPERIMENTAL)" + depends on PROFILING + help + OProfile is a profiling system capable of profiling the + whole system, include the kernel, kernel modules, libraries, + and applications. + + If unsure, say N. + +endmenu + diff --git a/arch/mips/oprofile/Makefile b/arch/mips/oprofile/Makefile new file mode 100644 index 000000000000..354261d37d62 --- /dev/null +++ b/arch/mips/oprofile/Makefile @@ -0,0 +1,15 @@ +EXTRA_CFLAGS := -Werror + +obj-$(CONFIG_OPROFILE) += oprofile.o + +DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \ + oprof.o cpu_buffer.o buffer_sync.o \ + event_buffer.o oprofile_files.o \ + oprofilefs.o oprofile_stats.o \ + timer_int.o ) + +oprofile-y := $(DRIVER_OBJS) common.o + +oprofile-$(CONFIG_CPU_MIPS32) += op_model_mipsxx.o +oprofile-$(CONFIG_CPU_MIPS64) += op_model_mipsxx.o +oprofile-$(CONFIG_CPU_RM9000) += op_model_rm9000.o diff --git a/arch/mips/oprofile/common.c b/arch/mips/oprofile/common.c new file mode 100644 index 000000000000..ab65ce3d471a --- /dev/null +++ b/arch/mips/oprofile/common.c @@ -0,0 +1,106 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2004 by Ralf Baechle + */ +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/oprofile.h> +#include <linux/smp.h> +#include <asm/cpu-info.h> + +#include "op_impl.h" + +extern struct op_mips_model op_model_mipsxx __attribute__((weak)); +extern struct op_mips_model op_model_rm9000 __attribute__((weak)); + +static struct op_mips_model *model; + +static struct op_counter_config ctr[20]; + +static int op_mips_setup(void) +{ + /* Pre-compute the values to stuff in the hardware registers. */ + model->reg_setup(ctr); + + /* Configure the registers on all cpus. */ + on_each_cpu(model->cpu_setup, 0, 0, 1); + + return 0; +} + +static int op_mips_create_files(struct super_block * sb, struct dentry * root) +{ + int i; + + for (i = 0; i < model->num_counters; ++i) { + struct dentry *dir; + char buf[3]; + + snprintf(buf, sizeof buf, "%d", i); + dir = oprofilefs_mkdir(sb, root, buf); + + oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled); + oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event); + oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count); + /* Dummies. */ + oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel); + oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user); + oprofilefs_create_ulong(sb, dir, "exl", &ctr[i].exl); + oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask); + } + + return 0; +} + +static int op_mips_start(void) +{ + on_each_cpu(model->cpu_start, NULL, 0, 1); + + return 0; +} + +static void op_mips_stop(void) +{ + /* Disable performance monitoring for all counters. */ + on_each_cpu(model->cpu_stop, NULL, 0, 1); +} + +void __init oprofile_arch_init(struct oprofile_operations *ops) +{ + struct op_mips_model *lmodel = NULL; + + switch (current_cpu_data.cputype) { + case CPU_24K: + lmodel = &op_model_mipsxx; + break; + + case CPU_RM9000: + lmodel = &op_model_rm9000; + break; + }; + + if (!lmodel) + return; + + if (lmodel->init()) + return; + + model = lmodel; + + ops->create_files = op_mips_create_files; + ops->setup = op_mips_setup; + ops->start = op_mips_start; + ops->stop = op_mips_stop; + ops->cpu_type = lmodel->cpu_type; + + printk(KERN_INFO "oprofile: using %s performance monitoring.\n", + lmodel->cpu_type); +} + +void oprofile_arch_exit(void) +{ + model->exit(); +} diff --git a/arch/mips/oprofile/op_impl.h b/arch/mips/oprofile/op_impl.h new file mode 100644 index 000000000000..9f5cdff041be --- /dev/null +++ b/arch/mips/oprofile/op_impl.h @@ -0,0 +1,37 @@ +/** + * @file arch/alpha/oprofile/op_impl.h + * + * @remark Copyright 2002 OProfile authors + * @remark Read the file COPYING + * + * @author Richard Henderson <rth@twiddle.net> + */ + +#ifndef OP_IMPL_H +#define OP_IMPL_H 1 + +/* Per-counter configuration as set via oprofilefs. */ +struct op_counter_config { + unsigned long enabled; + unsigned long event; + unsigned long count; + /* Dummies because I am too lazy to hack the userspace tools. */ + unsigned long kernel; + unsigned long user; + unsigned long exl; + unsigned long unit_mask; +}; + +/* Per-architecture configury and hooks. */ +struct op_mips_model { + void (*reg_setup) (struct op_counter_config *); + void (*cpu_setup) (void * dummy); + int (*init)(void); + void (*exit)(void); + void (*cpu_start)(void *args); + void (*cpu_stop)(void *args); + char *cpu_type; + unsigned char num_counters; +}; + +#endif diff --git a/arch/mips/oprofile/op_model_rm9000.c b/arch/mips/oprofile/op_model_rm9000.c new file mode 100644 index 000000000000..bee47793cb1a --- /dev/null +++ b/arch/mips/oprofile/op_model_rm9000.c @@ -0,0 +1,137 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2004 by Ralf Baechle + */ +#include <linux/oprofile.h> +#include <linux/interrupt.h> +#include <linux/smp.h> + +#include "op_impl.h" + +#define RM9K_COUNTER1_EVENT(event) ((event) << 0) +#define RM9K_COUNTER1_SUPERVISOR (1ULL << 7) +#define RM9K_COUNTER1_KERNEL (1ULL << 8) +#define RM9K_COUNTER1_USER (1ULL << 9) +#define RM9K_COUNTER1_ENABLE (1ULL << 10) +#define RM9K_COUNTER1_OVERFLOW (1ULL << 15) + +#define RM9K_COUNTER2_EVENT(event) ((event) << 16) +#define RM9K_COUNTER2_SUPERVISOR (1ULL << 23) +#define RM9K_COUNTER2_KERNEL (1ULL << 24) +#define RM9K_COUNTER2_USER (1ULL << 25) +#define RM9K_COUNTER2_ENABLE (1ULL << 26) +#define RM9K_COUNTER2_OVERFLOW (1ULL << 31) + +extern unsigned int rm9000_perfcount_irq; + +static struct rm9k_register_config { + unsigned int control; + unsigned int reset_counter1; + unsigned int reset_counter2; +} reg; + +/* Compute all of the registers in preparation for enabling profiling. */ + +static void rm9000_reg_setup(struct op_counter_config *ctr) +{ + unsigned int control = 0; + + /* Compute the performance counter control word. */ + /* For now count kernel and user mode */ + if (ctr[0].enabled) + control |= RM9K_COUNTER1_EVENT(ctr[0].event) | + RM9K_COUNTER1_KERNEL | + RM9K_COUNTER1_USER | + RM9K_COUNTER1_ENABLE; + if (ctr[1].enabled) + control |= RM9K_COUNTER2_EVENT(ctr[1].event) | + RM9K_COUNTER2_KERNEL | + RM9K_COUNTER2_USER | + RM9K_COUNTER2_ENABLE; + reg.control = control; + + reg.reset_counter1 = 0x80000000 - ctr[0].count; + reg.reset_counter2 = 0x80000000 - ctr[1].count; +} + +/* Program all of the registers in preparation for enabling profiling. */ + +static void rm9000_cpu_setup (void *args) +{ + uint64_t perfcount; + + perfcount = ((uint64_t) reg.reset_counter2 << 32) | reg.reset_counter1; + write_c0_perfcount(perfcount); +} + +static void rm9000_cpu_start(void *args) +{ + /* Start all counters on current CPU */ + write_c0_perfcontrol(reg.control); +} + +static void rm9000_cpu_stop(void *args) +{ + /* Stop all counters on current CPU */ + write_c0_perfcontrol(0); +} + +static irqreturn_t rm9000_perfcount_handler(int irq, void * dev_id, + struct pt_regs *regs) +{ + unsigned int control = read_c0_perfcontrol(); + uint32_t counter1, counter2; + uint64_t counters; + + /* + * RM9000 combines two 32-bit performance counters into a single + * 64-bit coprocessor zero register. To avoid a race updating the + * registers we need to stop the counters while we're messing with + * them ... + */ + write_c0_perfcontrol(0); + + counters = read_c0_perfcount(); + counter1 = counters; + counter2 = counters >> 32; + + if (control & RM9K_COUNTER1_OVERFLOW) { + oprofile_add_sample(regs, 0); + counter1 = reg.reset_counter1; + } + if (control & RM9K_COUNTER2_OVERFLOW) { + oprofile_add_sample(regs, 1); + counter2 = reg.reset_counter2; + } + + counters = ((uint64_t)counter2 << 32) | counter1; + write_c0_perfcount(counters); + write_c0_perfcontrol(reg.control); + + return IRQ_HANDLED; +} + +static int rm9000_init(void) +{ + return request_irq(rm9000_perfcount_irq, rm9000_perfcount_handler, + 0, "Perfcounter", NULL); +} + +static void rm9000_exit(void) +{ + free_irq(rm9000_perfcount_irq, NULL); +} + +struct op_mips_model op_model_rm9000 = { + .reg_setup = rm9000_reg_setup, + .cpu_setup = rm9000_cpu_setup, + .init = rm9000_init, + .exit = rm9000_exit, + .cpu_start = rm9000_cpu_start, + .cpu_stop = rm9000_cpu_stop, + .cpu_type = "mips/rm9000", + .num_counters = 2 +}; |