More oprofile bits for MIPS32-style performance counters. The code to
bolt this into the actual hardware interrupt is yet missing from this commit. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> FEXPORT(ret_from_fork)
This commit is contained in:
Ralf Baechle
parent
29c4869946
commit
54176736f7
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@ -11,7 +11,7 @@ config PROFILING
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config OPROFILE
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tristate "OProfile system profiling (EXPERIMENTAL)"
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depends on PROFILING
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depends on PROFILING && EXPERIMENTAL
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help
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OProfile is a profiling system capable of profiling the
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whole system, include the kernel, kernel modules, libraries,
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@ -3,7 +3,8 @@
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2004 by Ralf Baechle
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* Copyright (C) 2004, 2005 Ralf Baechle
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* Copyright (C) 2005 MIPS Technologies, Inc.
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*/
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#include <linux/errno.h>
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#include <linux/init.h>
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@ -45,10 +46,10 @@ static int op_mips_create_files(struct super_block * sb, struct dentry * root)
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oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
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oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
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oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
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/* Dummies. */
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oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
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oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
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oprofilefs_create_ulong(sb, dir, "exl", &ctr[i].exl);
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/* Dummy. */
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oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
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}
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@ -68,9 +69,10 @@ static void op_mips_stop(void)
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on_each_cpu(model->cpu_stop, NULL, 0, 1);
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}
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void __init oprofile_arch_init(struct oprofile_operations *ops)
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int __init oprofile_arch_init(struct oprofile_operations *ops)
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{
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struct op_mips_model *lmodel = NULL;
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int res;
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switch (current_cpu_data.cputype) {
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case CPU_24K:
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@ -83,21 +85,25 @@ void __init oprofile_arch_init(struct oprofile_operations *ops)
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};
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if (!lmodel)
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return;
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return -ENODEV;
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if (lmodel->init())
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return;
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res = lmodel->init();
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if (res)
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return res;
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model = lmodel;
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ops->create_files = op_mips_create_files;
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ops->setup = op_mips_setup;
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ops->start = op_mips_start;
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ops->stop = op_mips_stop;
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ops->cpu_type = lmodel->cpu_type;
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ops->create_files = op_mips_create_files;
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ops->setup = op_mips_setup;
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//ops->shutdown = op_mips_shutdown;
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ops->start = op_mips_start;
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ops->stop = op_mips_stop;
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ops->cpu_type = lmodel->cpu_type;
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printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
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lmodel->cpu_type);
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return 0;
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}
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void oprofile_arch_exit(void)
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@ -10,6 +10,11 @@
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#ifndef OP_IMPL_H
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#define OP_IMPL_H 1
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struct pt_regs;
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extern void null_perf_irq(struct pt_regs *regs);
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extern void (*perf_irq)(struct pt_regs *regs);
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/* Per-counter configuration as set via oprofilefs. */
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struct op_counter_config {
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unsigned long enabled;
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@ -0,0 +1,215 @@
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2004, 2005 by Ralf Baechle
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* Copyright (C) 2005 by MIPS Technologies, Inc.
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*/
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#include <linux/oprofile.h>
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#include <linux/interrupt.h>
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#include <linux/smp.h>
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#include "op_impl.h"
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#define M_PERFCTL_EXL (1UL << 0)
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#define M_PERFCTL_KERNEL (1UL << 1)
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#define M_PERFCTL_SUPERVISOR (1UL << 2)
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#define M_PERFCTL_USER (1UL << 3)
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#define M_PERFCTL_INTERRUPT_ENABLE (1UL << 4)
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#define M_PERFCTL_EVENT(event) ((event) << 5)
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#define M_PERFCTL_WIDE (1UL << 30)
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#define M_PERFCTL_MORE (1UL << 31)
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#define M_COUNTER_OVERFLOW (1UL << 31)
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struct op_mips_model op_model_mipsxx;
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static struct mipsxx_register_config {
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unsigned int control[4];
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unsigned int counter[4];
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} reg;
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/* Compute all of the registers in preparation for enabling profiling. */
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static void mipsxx_reg_setup(struct op_counter_config *ctr)
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{
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unsigned int counters = op_model_mipsxx.num_counters;
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int i;
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/* Compute the performance counter control word. */
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/* For now count kernel and user mode */
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for (i = 0; i < counters; i++) {
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reg.control[i] = 0;
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reg.counter[i] = 0;
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if (!ctr[i].enabled)
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continue;
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reg.control[i] = M_PERFCTL_EVENT(ctr[i].event) |
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M_PERFCTL_INTERRUPT_ENABLE;
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if (ctr[i].kernel)
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reg.control[i] |= M_PERFCTL_KERNEL;
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if (ctr[i].user)
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reg.control[i] |= M_PERFCTL_USER;
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if (ctr[i].exl)
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reg.control[i] |= M_PERFCTL_EXL;
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reg.counter[i] = 0x80000000 - ctr[i].count;
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}
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}
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/* Program all of the registers in preparation for enabling profiling. */
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static void mipsxx_cpu_setup (void *args)
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{
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unsigned int counters = op_model_mipsxx.num_counters;
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switch (counters) {
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case 4:
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write_c0_perfctrl3(0);
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write_c0_perfcntr3(reg.counter[3]);
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case 3:
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write_c0_perfctrl2(0);
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write_c0_perfcntr2(reg.counter[2]);
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case 2:
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write_c0_perfctrl1(0);
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write_c0_perfcntr1(reg.counter[1]);
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case 1:
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write_c0_perfctrl0(0);
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write_c0_perfcntr0(reg.counter[0]);
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}
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}
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/* Start all counters on current CPU */
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static void mipsxx_cpu_start(void *args)
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{
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unsigned int counters = op_model_mipsxx.num_counters;
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switch (counters) {
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case 4:
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write_c0_perfctrl3(reg.control[3]);
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case 3:
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write_c0_perfctrl2(reg.control[2]);
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case 2:
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write_c0_perfctrl1(reg.control[1]);
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case 1:
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write_c0_perfctrl0(reg.control[0]);
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}
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}
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/* Stop all counters on current CPU */
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static void mipsxx_cpu_stop(void *args)
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{
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unsigned int counters = op_model_mipsxx.num_counters;
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switch (counters) {
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case 4:
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write_c0_perfctrl3(0);
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case 3:
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write_c0_perfctrl2(0);
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case 2:
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write_c0_perfctrl1(0);
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case 1:
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write_c0_perfctrl0(0);
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}
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}
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static void mipsxx_perfcount_handler(struct pt_regs *regs)
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{
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unsigned int counters = op_model_mipsxx.num_counters;
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unsigned int control;
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unsigned int counter;
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switch (counters) {
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#define HANDLE_COUNTER(n) \
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case n + 1: \
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control = read_c0_perfctrl ## n(); \
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counter = read_c0_perfcntr ## n(); \
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if ((control & M_PERFCTL_INTERRUPT_ENABLE) && \
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(counter & M_COUNTER_OVERFLOW)) { \
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oprofile_add_sample(regs, n); \
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write_c0_perfcntr ## n(reg.counter[n]); \
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}
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HANDLE_COUNTER(3)
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HANDLE_COUNTER(2)
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HANDLE_COUNTER(1)
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HANDLE_COUNTER(0)
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}
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}
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#define M_CONFIG1_PC (1 << 4)
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static inline int n_counters(void)
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{
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if (!(read_c0_config1() & M_CONFIG1_PC))
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return 0;
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if (!(read_c0_perfctrl0() & M_PERFCTL_MORE))
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return 1;
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if (!(read_c0_perfctrl1() & M_PERFCTL_MORE))
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return 2;
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if (!(read_c0_perfctrl2() & M_PERFCTL_MORE))
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return 3;
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return 4;
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}
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static inline void reset_counters(int counters)
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{
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switch (counters) {
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case 4:
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write_c0_perfctrl3(0);
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write_c0_perfcntr3(0);
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case 3:
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write_c0_perfctrl2(0);
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write_c0_perfcntr2(0);
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case 2:
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write_c0_perfctrl1(0);
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write_c0_perfcntr1(0);
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case 1:
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write_c0_perfctrl0(0);
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write_c0_perfcntr0(0);
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}
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}
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static int __init mipsxx_init(void)
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{
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int counters;
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counters = n_counters();
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if (counters == 0)
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return -ENODEV;
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reset_counters(counters);
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op_model_mipsxx.num_counters = counters;
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switch (current_cpu_data.cputype) {
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case CPU_24K:
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op_model_mipsxx.cpu_type = "mips/24K";
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break;
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default:
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printk(KERN_ERR "Profiling unsupported for this CPU\n");
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return -ENODEV;
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}
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perf_irq = mipsxx_perfcount_handler;
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return 0;
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}
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static void mipsxx_exit(void)
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{
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reset_counters(op_model_mipsxx.num_counters);
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perf_irq = null_perf_irq;
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}
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struct op_mips_model op_model_mipsxx = {
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.reg_setup = mipsxx_reg_setup,
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.cpu_setup = mipsxx_cpu_setup,
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.init = mipsxx_init,
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.exit = mipsxx_exit,
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.cpu_start = mipsxx_cpu_start,
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.cpu_stop = mipsxx_cpu_stop,
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};
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