2 * arch/powerpc/kernel/pmc.c
4 * Copyright (C) 2004 David Gibson, IBM Corporation.
5 * Includes code formerly from arch/ppc/kernel/perfmon.c:
7 * Copyright (c) 2004 Freescale Semiconductor, Inc
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
15 #include <linux/errno.h>
16 #include <linux/spinlock.h>
17 #include <linux/module.h>
19 #include <asm/processor.h>
20 #include <asm/cputable.h>
27 static void dummy_perf(struct pt_regs
*regs
)
29 #if defined(CONFIG_FSL_EMB_PERFMON)
30 mtpmr(PMRN_PMGC0
, mfpmr(PMRN_PMGC0
) & ~PMGC0_PMIE
);
31 #elif defined(CONFIG_PPC64) || defined(CONFIG_6xx)
32 if (cur_cpu_spec
->pmc_type
== PPC_PMC_IBM
)
33 mtspr(SPRN_MMCR0
, mfspr(SPRN_MMCR0
) & ~(MMCR0_PMXE
|MMCR0_PMAO
));
35 mtspr(SPRN_MMCR0
, mfspr(SPRN_MMCR0
) & ~MMCR0_PMXE
);
40 static DEFINE_RAW_SPINLOCK(pmc_owner_lock
);
41 static void *pmc_owner_caller
; /* mostly for debugging */
42 perf_irq_t perf_irq
= dummy_perf
;
44 int reserve_pmc_hardware(perf_irq_t new_perf_irq
)
48 raw_spin_lock(&pmc_owner_lock
);
50 if (pmc_owner_caller
) {
51 printk(KERN_WARNING
"reserve_pmc_hardware: "
52 "PMC hardware busy (reserved by caller %p)\n",
58 pmc_owner_caller
= __builtin_return_address(0);
59 perf_irq
= new_perf_irq
? new_perf_irq
: dummy_perf
;
62 raw_spin_unlock(&pmc_owner_lock
);
65 EXPORT_SYMBOL_GPL(reserve_pmc_hardware
);
67 void release_pmc_hardware(void)
69 raw_spin_lock(&pmc_owner_lock
);
71 WARN_ON(! pmc_owner_caller
);
73 pmc_owner_caller
= NULL
;
74 perf_irq
= dummy_perf
;
76 raw_spin_unlock(&pmc_owner_lock
);
78 EXPORT_SYMBOL_GPL(release_pmc_hardware
);
81 void power4_enable_pmcs(void)
85 hid0
= mfspr(SPRN_HID0
);
86 hid0
|= 1UL << (63 - 20);
88 /* POWER4 requires the following sequence */
98 "isync" : "=&r" (hid0
) : "i" (SPRN_HID0
), "0" (hid0
):
101 #endif /* CONFIG_PPC64 */
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