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Commit 2c2551ab authored by David S. Miller's avatar David S. Miller
Browse files

sparc64: Add interface for registering a performance counter IRQ handler. 



Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0871420f

arch/sparc/include/asm/irq_64.h

+3 −0
Original line number Original line Diff line number Diff line
@@ -66,6 +66,9 @@ extern void virt_irq_free(unsigned int virt_irq); 
extern void __init init_IRQ(void);

extern void __init init_IRQ(void);

extern void fixup_irqs(void);

extern void fixup_irqs(void);





extern int register_perfctr_intr(void (*handler)(struct pt_regs *));

extern void release_perfctr_intr(void (*handler)(struct pt_regs *));



static inline void set_softint(unsigned long bits)

static inline void set_softint(unsigned long bits)

{

{

	__asm__ __volatile__("wr	%0, 0x0, %%set_softint"

	__asm__ __volatile__("wr	%0, 0x0, %%set_softint"

arch/sparc64/kernel/irq.c

+63 −0
Original line number Original line Diff line number Diff line
@@ -775,6 +775,69 @@ void do_softirq(void) 
	local_irq_restore(flags);

	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

#ifdef CONFIG_HOTPLUG_CPU

void fixup_irqs(void)

void fixup_irqs(void)

{

{

arch/sparc64/kernel/ttable.S

+1 −1
Original line number Original line Diff line number Diff line
@@ -66,7 +66,7 @@ tl0_irq6: BTRAP(0x46) 
tl0_irq7:	BTRAP(0x47) BTRAP(0x48) BTRAP(0x49)

tl0_irq7:	BTRAP(0x47) BTRAP(0x48) BTRAP(0x49)

tl0_irq10:	BTRAP(0x4a) BTRAP(0x4b) BTRAP(0x4c) BTRAP(0x4d)

tl0_irq10:	BTRAP(0x4a) BTRAP(0x4b) BTRAP(0x4c) BTRAP(0x4d)

tl0_irq14:	TRAP_IRQ(timer_interrupt, 14)

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_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_resv056:	BTRAP(0x56) BTRAP(0x57) BTRAP(0x58) BTRAP(0x59) BTRAP(0x5a) BTRAP(0x5b)

tl0_resv05c:	BTRAP(0x5c) BTRAP(0x5d) BTRAP(0x5e) BTRAP(0x5f)

tl0_resv05c:	BTRAP(0x5c) BTRAP(0x5d) BTRAP(0x5e) BTRAP(0x5f)