diff options
Diffstat (limited to 'arch/sh/oprofile')
| -rw-r--r-- | arch/sh/oprofile/Makefile | 15 | ||||
| -rw-r--r-- | arch/sh/oprofile/backtrace.c | 91 | ||||
| -rw-r--r-- | arch/sh/oprofile/common.c | 64 | ||||
| -rw-r--r-- | arch/sh/oprofile/op_model_null.c | 23 | ||||
| -rw-r--r-- | arch/sh/oprofile/op_model_sh7750.c | 273 |
5 files changed, 161 insertions, 305 deletions
diff --git a/arch/sh/oprofile/Makefile b/arch/sh/oprofile/Makefile index 2efc2e79fd2..ce3b119021e 100644 --- a/arch/sh/oprofile/Makefile +++ b/arch/sh/oprofile/Makefile @@ -1,18 +1,15 @@ obj-$(CONFIG_OPROFILE) += oprofile.o +CFLAGS_common.o += -DUTS_MACHINE='"$(UTS_MACHINE)"' + DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \ oprof.o cpu_buffer.o buffer_sync.o \ event_buffer.o oprofile_files.o \ oprofilefs.o oprofile_stats.o \ timer_int.o ) -profdrvr-y := op_model_null.o - -# SH7750-style performance counters exist across 7750/7750S and 7091. -profdrvr-$(CONFIG_CPU_SUBTYPE_SH7750S) := op_model_sh7750.o -profdrvr-$(CONFIG_CPU_SUBTYPE_SH7750) := op_model_sh7750.o -profdrvr-$(CONFIG_CPU_SUBTYPE_SH7091) := op_model_sh7750.o - -oprofile-y := $(DRIVER_OBJS) $(profdrvr-y) +ifeq ($(CONFIG_HW_PERF_EVENTS),y) +DRIVER_OBJS += $(addprefix ../../../drivers/oprofile/, oprofile_perf.o) +endif -EXTRA_CFLAGS += -Werror +oprofile-y := $(DRIVER_OBJS) common.o backtrace.o diff --git a/arch/sh/oprofile/backtrace.c b/arch/sh/oprofile/backtrace.c new file mode 100644 index 00000000000..9c88dcd56e8 --- /dev/null +++ b/arch/sh/oprofile/backtrace.c @@ -0,0 +1,91 @@ +/* + * SH specific backtracing code for oprofile + * + * Copyright 2007 STMicroelectronics Ltd. + * + * Author: Dave Peverley <dpeverley@mpc-data.co.uk> + * + * Based on ARM oprofile backtrace code by Richard Purdie and in turn, i386 + * oprofile backtrace code by John Levon, David Smith + * + * 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/oprofile.h> +#include <linux/sched.h> +#include <linux/kallsyms.h> +#include <linux/mm.h> +#include <asm/unwinder.h> +#include <asm/ptrace.h> +#include <asm/uaccess.h> +#include <asm/sections.h> +#include <asm/stacktrace.h> + +static int backtrace_stack(void *data, char *name) +{ + /* Yes, we want all stacks */ + return 0; +} + +static void backtrace_address(void *data, unsigned long addr, int reliable) +{ + unsigned int *depth = data; + + if ((*depth)--) + oprofile_add_trace(addr); +} + +static struct stacktrace_ops backtrace_ops = { + .stack = backtrace_stack, + .address = backtrace_address, +}; + +/* Limit to stop backtracing too far. */ +static int backtrace_limit = 20; + +static unsigned long * +user_backtrace(unsigned long *stackaddr, struct pt_regs *regs) +{ + unsigned long buf_stack; + + /* Also check accessibility of address */ + if (!access_ok(VERIFY_READ, stackaddr, sizeof(unsigned long))) + return NULL; + + if (__copy_from_user_inatomic(&buf_stack, stackaddr, sizeof(unsigned long))) + return NULL; + + /* Quick paranoia check */ + if (buf_stack & 3) + return NULL; + + oprofile_add_trace(buf_stack); + + stackaddr++; + + return stackaddr; +} + +void sh_backtrace(struct pt_regs * const regs, unsigned int depth) +{ + unsigned long *stackaddr; + + /* + * Paranoia - clip max depth as we could get lost in the weeds. + */ + if (depth > backtrace_limit) + depth = backtrace_limit; + + stackaddr = (unsigned long *)kernel_stack_pointer(regs); + if (!user_mode(regs)) { + if (depth) + unwind_stack(NULL, regs, stackaddr, + &backtrace_ops, &depth); + return; + } + + while (depth-- && (stackaddr != NULL)) + stackaddr = user_backtrace(stackaddr, regs); +} diff --git a/arch/sh/oprofile/common.c b/arch/sh/oprofile/common.c new file mode 100644 index 00000000000..e4dd5d5a111 --- /dev/null +++ b/arch/sh/oprofile/common.c @@ -0,0 +1,64 @@ +/* + * arch/sh/oprofile/init.c + * + * Copyright (C) 2003 - 2010 Paul Mundt + * + * Based on arch/mips/oprofile/common.c: + * + * Copyright (C) 2004, 2005 Ralf Baechle + * Copyright (C) 2005 MIPS Technologies, Inc. + * + * 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. + */ +#include <linux/kernel.h> +#include <linux/oprofile.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/smp.h> +#include <linux/perf_event.h> +#include <linux/slab.h> +#include <asm/processor.h> + +extern void sh_backtrace(struct pt_regs * const regs, unsigned int depth); + +#ifdef CONFIG_HW_PERF_EVENTS +/* + * This will need to be reworked when multiple PMUs are supported. + */ +static char *sh_pmu_op_name; + +char *op_name_from_perf_id(void) +{ + return sh_pmu_op_name; +} + +int __init oprofile_arch_init(struct oprofile_operations *ops) +{ + ops->backtrace = sh_backtrace; + + if (perf_num_counters() == 0) + return -ENODEV; + + sh_pmu_op_name = kasprintf(GFP_KERNEL, "%s/%s", + UTS_MACHINE, perf_pmu_name()); + if (unlikely(!sh_pmu_op_name)) + return -ENOMEM; + + return oprofile_perf_init(ops); +} + +void oprofile_arch_exit(void) +{ + oprofile_perf_exit(); + kfree(sh_pmu_op_name); +} +#else +int __init oprofile_arch_init(struct oprofile_operations *ops) +{ + ops->backtrace = sh_backtrace; + return -ENODEV; +} +void oprofile_arch_exit(void) {} +#endif /* CONFIG_HW_PERF_EVENTS */ diff --git a/arch/sh/oprofile/op_model_null.c b/arch/sh/oprofile/op_model_null.c deleted file mode 100644 index a845b088edb..00000000000 --- a/arch/sh/oprofile/op_model_null.c +++ /dev/null @@ -1,23 +0,0 @@ -/* - * arch/sh/oprofile/op_model_null.c - * - * Copyright (C) 2003 Paul Mundt - * - * 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. - */ -#include <linux/kernel.h> -#include <linux/oprofile.h> -#include <linux/init.h> -#include <linux/errno.h> - -int __init oprofile_arch_init(struct oprofile_operations *ops) -{ - return -ENODEV; -} - -void oprofile_arch_exit(void) -{ -} - diff --git a/arch/sh/oprofile/op_model_sh7750.c b/arch/sh/oprofile/op_model_sh7750.c deleted file mode 100644 index 6b9a98e0700..00000000000 --- a/arch/sh/oprofile/op_model_sh7750.c +++ /dev/null @@ -1,273 +0,0 @@ -/* - * arch/sh/oprofile/op_model_sh7750.c - * - * OProfile support for SH7750/SH7750S Performance Counters - * - * Copyright (C) 2003, 2004 Paul Mundt - * - * 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. - */ -#include <linux/kernel.h> -#include <linux/oprofile.h> -#include <linux/profile.h> -#include <linux/init.h> -#include <linux/errno.h> -#include <linux/interrupt.h> -#include <linux/fs.h> -#include <asm/uaccess.h> -#include <asm/io.h> - -#define PM_CR_BASE 0xff000084 /* 16-bit */ -#define PM_CTR_BASE 0xff100004 /* 32-bit */ - -#define PMCR1 (PM_CR_BASE + 0x00) -#define PMCR2 (PM_CR_BASE + 0x04) -#define PMCTR1H (PM_CTR_BASE + 0x00) -#define PMCTR1L (PM_CTR_BASE + 0x04) -#define PMCTR2H (PM_CTR_BASE + 0x08) -#define PMCTR2L (PM_CTR_BASE + 0x0c) - -#define PMCR_PMM_MASK 0x0000003f - -#define PMCR_CLKF 0x00000100 -#define PMCR_PMCLR 0x00002000 -#define PMCR_PMST 0x00004000 -#define PMCR_PMEN 0x00008000 - -#define PMCR_ENABLE (PMCR_PMST | PMCR_PMEN) - -/* - * SH7750/SH7750S have 2 perf counters - */ -#define NR_CNTRS 2 - -struct op_counter_config { - unsigned long enabled; - unsigned long event; - unsigned long count; - - /* Dummy values for userspace tool compliance */ - unsigned long kernel; - unsigned long user; - unsigned long unit_mask; -}; - -static struct op_counter_config ctr[NR_CNTRS]; - -/* - * There are a number of events supported by each counter (33 in total). - * Since we have 2 counters, each counter will take the event code as it - * corresponds to the PMCR PMM setting. Each counter can be configured - * independently. - * - * Event Code Description - * ---------- ----------- - * - * 0x01 Operand read access - * 0x02 Operand write access - * 0x03 UTLB miss - * 0x04 Operand cache read miss - * 0x05 Operand cache write miss - * 0x06 Instruction fetch (w/ cache) - * 0x07 Instruction TLB miss - * 0x08 Instruction cache miss - * 0x09 All operand accesses - * 0x0a All instruction accesses - * 0x0b OC RAM operand access - * 0x0d On-chip I/O space access - * 0x0e Operand access (r/w) - * 0x0f Operand cache miss (r/w) - * 0x10 Branch instruction - * 0x11 Branch taken - * 0x12 BSR/BSRF/JSR - * 0x13 Instruction execution - * 0x14 Instruction execution in parallel - * 0x15 FPU Instruction execution - * 0x16 Interrupt - * 0x17 NMI - * 0x18 trapa instruction execution - * 0x19 UBCA match - * 0x1a UBCB match - * 0x21 Instruction cache fill - * 0x22 Operand cache fill - * 0x23 Elapsed time - * 0x24 Pipeline freeze by I-cache miss - * 0x25 Pipeline freeze by D-cache miss - * 0x27 Pipeline freeze by branch instruction - * 0x28 Pipeline freeze by CPU register - * 0x29 Pipeline freeze by FPU - * - * Unfortunately we don't have a native exception or interrupt for counter - * overflow (although since these counters can run for 16.3 days without - * overflowing, it's not really necessary). - * - * OProfile on the other hand likes to have samples taken periodically, so - * for now we just piggyback the timer interrupt to get the expected - * behavior. - */ - -static int sh7750_timer_notify(struct pt_regs *regs) -{ - oprofile_add_sample(regs, 0); - return 0; -} - -static u64 sh7750_read_counter(int counter) -{ - u32 hi, lo; - - hi = (counter == 0) ? ctrl_inl(PMCTR1H) : ctrl_inl(PMCTR2H); - lo = (counter == 0) ? ctrl_inl(PMCTR1L) : ctrl_inl(PMCTR2L); - - return (u64)((u64)(hi & 0xffff) << 32) | lo; -} - -/* - * Files will be in a path like: - * - * /<oprofilefs mount point>/<counter number>/<file> - * - * So when dealing with <file>, we look to the parent dentry for the counter - * number. - */ -static inline int to_counter(struct file *file) -{ - const unsigned char *name = file->f_path.dentry->d_parent->d_name.name; - - return (int)simple_strtol(name, NULL, 10); -} - -/* - * XXX: We have 48-bit counters, so we're probably going to want something - * more along the lines of oprofilefs_ullong_to_user().. Truncating to - * unsigned long works fine for now though, as long as we don't attempt to - * profile for too horribly long. - */ -static ssize_t sh7750_read_count(struct file *file, char __user *buf, - size_t count, loff_t *ppos) -{ - int counter = to_counter(file); - u64 val = sh7750_read_counter(counter); - - return oprofilefs_ulong_to_user((unsigned long)val, buf, count, ppos); -} - -static ssize_t sh7750_write_count(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - int counter = to_counter(file); - unsigned long val; - - if (oprofilefs_ulong_from_user(&val, buf, count)) - return -EFAULT; - - /* - * Any write will clear the counter, although only 0 should be - * written for this purpose, as we do not support setting the - * counter to an arbitrary value. - */ - WARN_ON(val != 0); - - if (counter == 0) { - ctrl_outw(ctrl_inw(PMCR1) | PMCR_PMCLR, PMCR1); - } else { - ctrl_outw(ctrl_inw(PMCR2) | PMCR_PMCLR, PMCR2); - } - - return count; -} - -static const struct file_operations count_fops = { - .read = sh7750_read_count, - .write = sh7750_write_count, -}; - -static int sh7750_perf_counter_create_files(struct super_block *sb, struct dentry *root) -{ - int i; - - for (i = 0; i < NR_CNTRS; i++) { - struct dentry *dir; - char buf[4]; - - 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_file(sb, dir, "count", &count_fops); - - /* Dummy entries */ - oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel); - oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user); - oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask); - } - - return 0; -} - -static int sh7750_perf_counter_start(void) -{ - u16 pmcr; - - /* Enable counter 1 */ - if (ctr[0].enabled) { - pmcr = ctrl_inw(PMCR1); - WARN_ON(pmcr & PMCR_PMEN); - - pmcr &= ~PMCR_PMM_MASK; - pmcr |= ctr[0].event; - ctrl_outw(pmcr | PMCR_ENABLE, PMCR1); - } - - /* Enable counter 2 */ - if (ctr[1].enabled) { - pmcr = ctrl_inw(PMCR2); - WARN_ON(pmcr & PMCR_PMEN); - - pmcr &= ~PMCR_PMM_MASK; - pmcr |= ctr[1].event; - ctrl_outw(pmcr | PMCR_ENABLE, PMCR2); - } - - return register_timer_hook(sh7750_timer_notify); -} - -static void sh7750_perf_counter_stop(void) -{ - ctrl_outw(ctrl_inw(PMCR1) & ~PMCR_PMEN, PMCR1); - ctrl_outw(ctrl_inw(PMCR2) & ~PMCR_PMEN, PMCR2); - - unregister_timer_hook(sh7750_timer_notify); -} - -static struct oprofile_operations sh7750_perf_counter_ops = { - .create_files = sh7750_perf_counter_create_files, - .start = sh7750_perf_counter_start, - .stop = sh7750_perf_counter_stop, -}; - -int __init oprofile_arch_init(struct oprofile_operations *ops) -{ - if (!(current_cpu_data.flags & CPU_HAS_PERF_COUNTER)) - return -ENODEV; - - ops = &sh7750_perf_counter_ops; - ops->cpu_type = (char *)get_cpu_subtype(¤t_cpu_data); - - printk(KERN_INFO "oprofile: using SH-4 (%s) performance monitoring.\n", - sh7750_perf_counter_ops.cpu_type); - - /* Clear the counters */ - ctrl_outw(ctrl_inw(PMCR1) | PMCR_PMCLR, PMCR1); - ctrl_outw(ctrl_inw(PMCR2) | PMCR_PMCLR, PMCR2); - - return 0; -} - -void oprofile_arch_exit(void) -{ -} - |