169 lines
3.9 KiB
C
169 lines
3.9 KiB
C
/*
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* File: arch/blackfin/oprofile/common.c
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* Based on: arch/alpha/oprofile/common.c
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* Author: Anton Blanchard <anton@au.ibm.com>
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*
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* Created:
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* Description:
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*
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* Modified:
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* Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
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* Copyright 2004-2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/oprofile.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/errno.h>
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#include <linux/mutex.h>
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#include <linux/ptrace.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <asm/system.h>
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#include <asm/blackfin.h>
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#include "op_blackfin.h"
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#define BFIN_533_ID 0xE5040003
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#define BFIN_537_ID 0xE5040002
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static int pfmon_enabled;
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static struct mutex pfmon_lock;
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struct op_bfin533_model *model;
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struct op_counter_config ctr[OP_MAX_COUNTER];
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static int op_bfin_setup(void)
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{
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int ret;
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/* Pre-compute the values to stuff in the hardware registers. */
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spin_lock(&oprofilefs_lock);
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ret = model->reg_setup(ctr);
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spin_unlock(&oprofilefs_lock);
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return ret;
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}
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static void op_bfin_shutdown(void)
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{
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#if 0
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/* what is the difference between shutdown and stop? */
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#endif
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}
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static int op_bfin_start(void)
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{
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int ret = -EBUSY;
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printk(KERN_INFO "KSDBG:in %s\n", __FUNCTION__);
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mutex_lock(&pfmon_lock);
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if (!pfmon_enabled) {
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ret = model->start(ctr);
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pfmon_enabled = !ret;
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}
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mutex_unlock(&pfmon_lock);
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return ret;
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}
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static void op_bfin_stop(void)
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{
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mutex_lock(&pfmon_lock);
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if (pfmon_enabled) {
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model->stop();
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pfmon_enabled = 0;
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}
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mutex_unlock(&pfmon_lock);
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}
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static int op_bfin_create_files(struct super_block *sb, struct dentry *root)
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{
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int i;
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for (i = 0; i < model->num_counters; ++i) {
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struct dentry *dir;
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char buf[3];
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printk(KERN_INFO "Oprofile: creating files... \n");
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snprintf(buf, sizeof buf, "%d", i);
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dir = oprofilefs_mkdir(sb, root, buf);
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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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/*
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* We dont support per counter user/kernel selection, but
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* we leave the entries because userspace expects them
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*/
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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, "unit_mask",
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&ctr[i].unit_mask);
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}
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return 0;
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}
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int __init oprofile_arch_init(struct oprofile_operations *ops)
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{
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#ifdef CONFIG_HARDWARE_PM
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unsigned int dspid;
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mutex_init(&pfmon_lock);
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dspid = bfin_read_DSPID();
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printk(KERN_INFO "Oprofile got the cpu id is 0x%x. \n", dspid);
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switch (dspid) {
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case BFIN_533_ID:
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model = &op_model_bfin533;
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model->num_counters = 2;
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break;
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case BFIN_537_ID:
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model = &op_model_bfin533;
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model->num_counters = 2;
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break;
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default:
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return -ENODEV;
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}
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ops->cpu_type = model->name;
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ops->create_files = op_bfin_create_files;
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ops->setup = op_bfin_setup;
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ops->shutdown = op_bfin_shutdown;
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ops->start = op_bfin_start;
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ops->stop = op_bfin_stop;
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printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
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ops->cpu_type);
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return 0;
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#else
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return -1;
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#endif
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}
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void oprofile_arch_exit(void)
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{
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}
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