Release 4.14 arch/powerpc/kernel/pmc.c

/*
 *  arch/powerpc/kernel/pmc.c
 *
 *  Copyright (C) 2004 David Gibson, IBM Corporation.
 *  Includes code formerly from arch/ppc/kernel/perfmon.c:
 *    Author: Andy Fleming
 *    Copyright (c) 2004 Freescale Semiconductor, Inc
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 */

#include <linux/errno.h>
#include <linux/bug.h>
#include <linux/spinlock.h>
#include <linux/export.h>

#include <asm/processor.h>
#include <asm/cputable.h>
#include <asm/pmc.h>

#ifndef MMCR0_PMAO

#define MMCR0_PMAO	0
#endif



static void dummy_perf(struct pt_regs *regs)
{
#if defined(CONFIG_FSL_EMB_PERFMON)
	mtpmr(PMRN_PMGC0, mfpmr(PMRN_PMGC0) & ~PMGC0_PMIE);
#elif defined(CONFIG_PPC64) || defined(CONFIG_6xx)
	if (cur_cpu_spec->pmc_type == PPC_PMC_IBM)
		mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) & ~(MMCR0_PMXE|MMCR0_PMAO));
#else
	mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) & ~MMCR0_PMXE);
#endif
}


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CommitProp
David Gibson
45
54.22%
2
28.57%
Olof Johansson
28
33.73%
2
28.57%
Andy Fleming
9
10.84%
2
28.57%
Anton Blanchard
1
1.20%
1
14.29%
Total
83
100.00%
7
100.00%

static DEFINE_RAW_SPINLOCK(pmc_owner_lock);

static void *pmc_owner_caller; 
/* mostly for debugging */

perf_irq_t perf_irq = dummy_perf;



int reserve_pmc_hardware(perf_irq_t new_perf_irq)
{
	int err = 0;

	raw_spin_lock(&pmc_owner_lock);

	if (pmc_owner_caller) {
		printk(KERN_WARNING "reserve_pmc_hardware: "
		       "PMC hardware busy (reserved by caller %p)\n",
		       pmc_owner_caller);
		err = -EBUSY;
		goto out;
	}

	pmc_owner_caller = __builtin_return_address(0);
	perf_irq = new_perf_irq ? new_perf_irq : dummy_perf;

 out:
	raw_spin_unlock(&pmc_owner_lock);
	return err;
}
Contributors
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CommitProp
David Gibson
65
95.59%
1
33.33%
Thomas Gleixner
2
2.94%
1
33.33%
Andy Fleming
1
1.47%
1
33.33%
Total
68
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(reserve_pmc_hardware);



void release_pmc_hardware(void)
{
	raw_spin_lock(&pmc_owner_lock);

	WARN_ON(! pmc_owner_caller);

	pmc_owner_caller = NULL;
	perf_irq = dummy_perf;

	raw_spin_unlock(&pmc_owner_lock);
}
Contributors
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Prop
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CommitProp
David Gibson
31
93.94%
1
50.00%
Thomas Gleixner
2
6.06%
1
50.00%
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33
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(release_pmc_hardware);

#ifdef CONFIG_PPC64


void power4_enable_pmcs(void)
{
	unsigned long hid0;

	hid0 = mfspr(SPRN_HID0);
	hid0 |= 1UL << (63 - 20);

	/* POWER4 requires the following sequence */
	asm volatile(
                "sync\n"
                "mtspr     %1, %0\n"
                "mfspr     %0, %1\n"
                "mfspr     %0, %1\n"
                "mfspr     %0, %1\n"
                "mfspr     %0, %1\n"
                "mfspr     %0, %1\n"
                "mfspr     %0, %1\n"
                "isync" : "=&r" (hid0) : "i" (SPRN_HID0), "0" (hid0):
                "memory");
}
Contributors
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CommitProp
Michael Ellerman
30
93.75%
1
50.00%
Paul Mackerras
2
6.25%
1
50.00%
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32
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2
100.00%

#endif /* CONFIG_PPC64 */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
David Gibson
173
61.79%
2
13.33%
Olof Johansson
38
13.57%
2
13.33%
Michael Ellerman
30
10.71%
1
6.67%
Paul Mackerras
14
5.00%
2
13.33%
Andy Fleming
10
3.57%
3
20.00%
Thomas Gleixner
5
1.79%
1
6.67%
Paul Gortmaker
4
1.43%
2
13.33%
Ingo Molnar
3
1.07%
1
6.67%
Anton Blanchard
3
1.07%
1
6.67%
Total
280
100.00%
15
100.00%
Directory: arch/powerpc/kernel

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