94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
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/* kernel/perfmon.c
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* PPC 32 Performance Monitor Infrastructure
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*
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* Author: Andy Fleming
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* Copyright (c) 2004 Freescale Semiconductor, Inc
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/slab.h>
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#include <linux/user.h>
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#include <linux/a.out.h>
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#include <linux/interrupt.h>
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/prctl.h>
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#include <asm/pgtable.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/reg.h>
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#include <asm/xmon.h>
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/* A lock to regulate grabbing the interrupt */
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DEFINE_SPINLOCK(perfmon_lock);
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#ifdef CONFIG_FSL_BOOKE
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static void dummy_perf(struct pt_regs *regs)
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{
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unsigned int pmgc0 = mfpmr(PMRN_PMGC0);
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pmgc0 &= ~PMGC0_PMIE;
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mtpmr(PMRN_PMGC0, pmgc0);
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}
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#else
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/* Ensure exceptions are disabled */
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static void dummy_perf(struct pt_regs *regs)
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{
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unsigned int mmcr0 = mfspr(SPRN_MMCR0);
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mmcr0 &= ~MMCR0_PMXE;
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mtspr(SPRN_MMCR0, mmcr0);
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}
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#endif
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void (*perf_irq)(struct pt_regs *) = dummy_perf;
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/* Grab the interrupt, if it's free.
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* Returns 0 on success, -1 if the interrupt is taken already */
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int request_perfmon_irq(void (*handler)(struct pt_regs *))
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{
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int err = 0;
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spin_lock(&perfmon_lock);
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if (perf_irq == dummy_perf)
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perf_irq = handler;
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else {
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pr_info("perfmon irq already handled by %p\n", perf_irq);
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err = -1;
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}
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spin_unlock(&perfmon_lock);
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return err;
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}
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void free_perfmon_irq(void)
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{
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spin_lock(&perfmon_lock);
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perf_irq = dummy_perf;
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spin_unlock(&perfmon_lock);
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}
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EXPORT_SYMBOL(perf_irq);
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EXPORT_SYMBOL(request_perfmon_irq);
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EXPORT_SYMBOL(free_perfmon_irq);
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