244bc050d5
Current -git tree doesn't build when enabling oprofile on a non-bookE CPU (like on a PowerMac for example). While there is no performance counter support for these CPUs implemented yet, it's still nice to be able to use the timer based sampling, and that got broken. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
/* 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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#if defined (CONFIG_FSL_BOOKE) && !defined (CONFIG_E200)
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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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#elif CONFIG_6xx
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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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#else
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static void dummy_perf(struct pt_regs *regs)
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{
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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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