[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / arch / ppc / kernel / perfmon.c
blob918f6b252e454cc9c8a3374abfe0bc6b57e60569
1 /* kernel/perfmon.c
2 * PPC 32 Performance Monitor Infrastructure
4 * Author: Andy Fleming
5 * Copyright (c) 2004 Freescale Semiconductor, Inc
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
13 #include <linux/errno.h>
14 #include <linux/sched.h>
15 #include <linux/kernel.h>
16 #include <linux/mm.h>
17 #include <linux/stddef.h>
18 #include <linux/unistd.h>
19 #include <linux/ptrace.h>
20 #include <linux/slab.h>
21 #include <linux/user.h>
22 #include <linux/a.out.h>
23 #include <linux/interrupt.h>
24 #include <linux/config.h>
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/prctl.h>
29 #include <asm/pgtable.h>
30 #include <asm/uaccess.h>
31 #include <asm/system.h>
32 #include <asm/io.h>
33 #include <asm/reg.h>
34 #include <asm/xmon.h>
36 /* A lock to regulate grabbing the interrupt */
37 DEFINE_SPINLOCK(perfmon_lock);
39 #ifdef CONFIG_FSL_BOOKE
40 static void dummy_perf(struct pt_regs *regs)
42 unsigned int pmgc0 = mfpmr(PMRN_PMGC0);
44 pmgc0 &= ~PMGC0_PMIE;
45 mtpmr(PMRN_PMGC0, pmgc0);
48 #else
49 /* Ensure exceptions are disabled */
51 static void dummy_perf(struct pt_regs *regs)
53 unsigned int mmcr0 = mfspr(SPRN_MMCR0);
55 mmcr0 &= ~MMCR0_PMXE;
56 mtspr(SPRN_MMCR0, mmcr0);
58 #endif
60 void (*perf_irq)(struct pt_regs *) = dummy_perf;
62 /* Grab the interrupt, if it's free.
63 * Returns 0 on success, -1 if the interrupt is taken already */
64 int request_perfmon_irq(void (*handler)(struct pt_regs *))
66 int err = 0;
68 spin_lock(&perfmon_lock);
70 if (perf_irq == dummy_perf)
71 perf_irq = handler;
72 else {
73 pr_info("perfmon irq already handled by %p\n", perf_irq);
74 err = -1;
77 spin_unlock(&perfmon_lock);
79 return err;
82 void free_perfmon_irq(void)
84 spin_lock(&perfmon_lock);
86 perf_irq = dummy_perf;
88 spin_unlock(&perfmon_lock);
91 EXPORT_SYMBOL(perf_irq);
92 EXPORT_SYMBOL(request_perfmon_irq);
93 EXPORT_SYMBOL(free_perfmon_irq);