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Commit b709c083 authored by Stephen Rothwell's avatar Stephen Rothwell
Browse files

ppc64: move stack switching up in interrupt processing 



This will make the ppc64 multiplatform irq handling more like
the generic handling.

Signed-off-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
parent 66ba135c

arch/powerpc/kernel/misc_64.S

+4 −4
Original line number Diff line number Diff line
@@ -89,12 +89,12 @@ _GLOBAL(call_do_softirq) 
	mtlr	r0

	blr



_GLOBAL(call_handle_IRQ_event)

_GLOBAL(call_ppc_irq_dispatch_handler)

	mflr	r0

	std	r0,16(r1)

	stdu	r1,THREAD_SIZE-112(r6)

	mr	r1,r6

	bl	.handle_IRQ_event

	stdu	r1,THREAD_SIZE-112(r5)

	mr	r1,r5

	bl	.ppc_irq_dispatch_handler

	ld	r1,0(r1)

	ld	r0,16(r1)

	mtlr	r0

arch/ppc64/kernel/irq.c

+20 −20
Original line number Diff line number Diff line
@@ -157,9 +157,6 @@ void ppc_irq_dispatch_handler(struct pt_regs *regs, int irq) 
	int cpu = smp_processor_id();

	irq_desc_t *desc = get_irq_desc(irq);

	irqreturn_t action_ret;

#ifdef CONFIG_IRQSTACKS

	struct thread_info *curtp, *irqtp;

#endif



	kstat_cpu(cpu).irqs[irq]++;
@@ -227,19 +224,6 @@ void ppc_irq_dispatch_handler(struct pt_regs *regs, int irq) 
	for (;;) {

		spin_unlock(&desc->lock);



#ifdef CONFIG_IRQSTACKS

		/* Switch to the irq stack to handle this */

		curtp = current_thread_info();

		irqtp = hardirq_ctx[smp_processor_id()];

		if (curtp != irqtp) {

			irqtp->task = curtp->task;

			irqtp->flags = 0;

			action_ret = call_handle_IRQ_event(irq, regs, action, irqtp);

			irqtp->task = NULL;

			if (irqtp->flags)

				set_bits(irqtp->flags, &curtp->flags);

		} else

#endif

		action_ret = handle_IRQ_event(irq, regs, action);



		spin_lock(&desc->lock);
@@ -310,6 +294,9 @@ void do_IRQ(struct pt_regs *regs) 
void do_IRQ(struct pt_regs *regs)

{

	int irq;

#ifdef CONFIG_IRQSTACKS

	struct thread_info *curtp, *irqtp;

#endif



	irq_enter();
@@ -330,9 +317,22 @@ void do_IRQ(struct pt_regs *regs) 


	irq = ppc_md.get_irq(regs);



	if (irq >= 0)

	if (irq >= 0) {

#ifdef CONFIG_IRQSTACKS

		/* Switch to the irq stack to handle this */

		curtp = current_thread_info();

		irqtp = hardirq_ctx[smp_processor_id()];

		if (curtp != irqtp) {

			irqtp->task = curtp->task;

			irqtp->flags = 0;

			call_ppc_irq_dispatch_handler(regs, irq, irqtp);

			irqtp->task = NULL;

			if (irqtp->flags)

				set_bits(irqtp->flags, &curtp->flags);

		} else

#endif

			ppc_irq_dispatch_handler(regs, irq);

	else

	} else

		/* That's not SMP safe ... but who cares ? */

		ppc_spurious_interrupts++;

arch/ppc64/kernel/misc.S

+4 −4
Original line number Diff line number Diff line
@@ -78,12 +78,12 @@ _GLOBAL(call_do_softirq) 
	mtlr	r0

	blr



_GLOBAL(call_handle_IRQ_event)

_GLOBAL(call_ppc_irq_dispatch_handler)

	mflr	r0

	std	r0,16(r1)

	stdu	r1,THREAD_SIZE-112(r6)

	mr	r1,r6

	bl	.handle_IRQ_event

	stdu	r1,THREAD_SIZE-112(r5)

	mr	r1,r5

	bl	.ppc_irq_dispatch_handler

	ld	r1,0(r1)

	ld	r0,16(r1)

	mtlr	r0

include/asm-powerpc/irq.h

+2 −2
Original line number Diff line number Diff line
@@ -488,8 +488,8 @@ extern struct thread_info *softirq_ctx[NR_CPUS]; 


extern void irq_ctx_init(void);

extern void call_do_softirq(struct thread_info *tp);

extern int call_handle_IRQ_event(int irq, struct pt_regs *regs,

			struct irqaction *action, struct thread_info *tp);

extern int call_ppc_irq_dispatch_handler(struct pt_regs *regs, int irq,

		struct thread_info *tp);



#define __ARCH_HAS_DO_SOFTIRQ