diff options
| author | David S. Miller <davem@davemloft.net> | 2008-11-21 02:06:07 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-12-04 09:17:00 -0800 |
| commit | 2c2551ab99f9ba3c726e6a41c84ef0c7390fc546 (patch) | |
| tree | 21f7fb7366c27feae8e03f30951da27ef7f9d249 /arch/sparc64 | |
| parent | 0871420fad5844cb63cfcf85508c17bd9b15c08f (diff) | |
sparc64: Add interface for registering a performance counter IRQ handler.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64')
| -rw-r--r-- | arch/sparc64/kernel/irq.c | 63 | ||||
| -rw-r--r-- | arch/sparc64/kernel/ttable.S | 2 |
2 files changed, 64 insertions, 1 deletions
diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c index 52fc836f464..a3ea2bcb95d 100644 --- a/arch/sparc64/kernel/irq.c +++ b/arch/sparc64/kernel/irq.c @@ -775,6 +775,69 @@ void do_softirq(void) local_irq_restore(flags); } +static void unhandled_perf_irq(struct pt_regs *regs) +{ + unsigned long pcr, pic; + + read_pcr(pcr); + read_pic(pic); + + write_pcr(0); + + printk(KERN_EMERG "CPU %d: Got unexpected perf counter IRQ.\n", + smp_processor_id()); + printk(KERN_EMERG "CPU %d: PCR[%016lx] PIC[%016lx]\n", + smp_processor_id(), pcr, pic); +} + +/* Almost a direct copy of the powerpc PMC code. */ +static DEFINE_SPINLOCK(perf_irq_lock); +static void *perf_irq_owner_caller; /* mostly for debugging */ +static void (*perf_irq)(struct pt_regs *regs) = unhandled_perf_irq; + +/* Invoked from level 15 PIL handler in trap table. */ +void perfctr_irq(int irq, struct pt_regs *regs) +{ + clear_softint(1 << irq); + perf_irq(regs); +} + +int register_perfctr_intr(void (*handler)(struct pt_regs *)) +{ + int ret; + + if (!handler) + return -EINVAL; + + spin_lock(&perf_irq_lock); + if (perf_irq != unhandled_perf_irq) { + printk(KERN_WARNING "register_perfctr_intr: " + "perf IRQ busy (reserved by caller %p)\n", + perf_irq_owner_caller); + ret = -EBUSY; + goto out; + } + + perf_irq_owner_caller = __builtin_return_address(0); + perf_irq = handler; + + ret = 0; +out: + spin_unlock(&perf_irq_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(register_perfctr_intr); + +void release_perfctr_intr(void (*handler)(struct pt_regs *)) +{ + spin_lock(&perf_irq_lock); + perf_irq_owner_caller = NULL; + perf_irq = unhandled_perf_irq; + spin_unlock(&perf_irq_lock); +} +EXPORT_SYMBOL_GPL(release_perfctr_intr); + #ifdef CONFIG_HOTPLUG_CPU void fixup_irqs(void) { diff --git a/arch/sparc64/kernel/ttable.S b/arch/sparc64/kernel/ttable.S index 1ade3d6fb7f..2a31ffa4c28 100644 --- a/arch/sparc64/kernel/ttable.S +++ b/arch/sparc64/kernel/ttable.S @@ -66,7 +66,7 @@ tl0_irq6: BTRAP(0x46) tl0_irq7: BTRAP(0x47) BTRAP(0x48) BTRAP(0x49) tl0_irq10: BTRAP(0x4a) BTRAP(0x4b) BTRAP(0x4c) BTRAP(0x4d) tl0_irq14: TRAP_IRQ(timer_interrupt, 14) -tl0_irq15: TRAP_IRQ(handler_irq, 15) +tl0_irq15: TRAP_IRQ(perfctr_irq, 15) tl0_resv050: BTRAP(0x50) BTRAP(0x51) BTRAP(0x52) BTRAP(0x53) BTRAP(0x54) BTRAP(0x55) tl0_resv056: BTRAP(0x56) BTRAP(0x57) BTRAP(0x58) BTRAP(0x59) BTRAP(0x5a) BTRAP(0x5b) tl0_resv05c: BTRAP(0x5c) BTRAP(0x5d) BTRAP(0x5e) BTRAP(0x5f) |