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Merge git://oak/home/sfr/kernels/iseries/work
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Paul Mackerras committed Nov 10, 2005
2 parents 00557b5 + 756e710 commit e130bed
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Showing 18 changed files with 164 additions and 341 deletions.
2 changes: 1 addition & 1 deletion arch/powerpc/kernel/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ CFLAGS_btext.o += -fPIC
endif

obj-y := semaphore.o cputable.o ptrace.o syscalls.o \
signal_32.o pmc.o
irq.o signal_32.o pmc.o
obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \
signal_64.o ptrace32.o systbl.o \
paca.o ioctl32.o cpu_setup_power4.o \
Expand Down
265 changes: 112 additions & 153 deletions arch/ppc64/kernel/irq.c → arch/powerpc/kernel/irq.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5,12 +5,12 @@
* Copyright (C) 1992 Linus Torvalds
* Adapted from arch/i386 by Gary Thomas
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
* Updated and modified by Cort Dougan (cort@cs.nmt.edu)
* Copyright (C) 1996 Cort Dougan
* Updated and modified by Cort Dougan <cort@fsmlabs.com>
* Copyright (C) 1996-2001 Cort Dougan
* Adapted for Power Macintosh by Paul Mackerras
* Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
* Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
Expand All @@ -21,6 +21,14 @@
* instead of just grabbing them. Thus setups with different IRQ numbers
* shouldn't result in any weird surprises, and installing new handlers
* should be easier.
*
* The MPC8xx has an interrupt mask in the SIU. If a bit is set, the
* interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit
* mask register (of which only 16 are defined), hence the weird shifting
* and complement of the cached_irq_mask. I want to be able to stuff
* this right into the SIU SMASK register.
* Many of the prep/chrp functions are conditional compiled on CONFIG_8xx
* to reduce code space and undefined function references.
*/

#include <linux/errno.h>
Expand All @@ -29,6 +37,7 @@
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/timex.h>
Expand All @@ -40,9 +49,13 @@
#include <linux/irq.h>
#include <linux/proc_fs.h>
#include <linux/random.h>
#include <linux/kallsyms.h>
#include <linux/seq_file.h>
#include <linux/cpumask.h>
#include <linux/profile.h>
#include <linux/bitops.h>
#ifdef CONFIG_PPC64
#include <linux/kallsyms.h>
#endif

#include <asm/uaccess.h>
#include <asm/system.h>
Expand All @@ -52,35 +65,54 @@
#include <asm/cache.h>
#include <asm/prom.h>
#include <asm/ptrace.h>
#include <asm/iseries/it_lp_queue.h>
#include <asm/machdep.h>
#ifdef CONFIG_PPC64
#include <asm/iseries/it_lp_queue.h>
#include <asm/paca.h>
#endif

#ifdef CONFIG_SMP
extern void iSeries_smp_message_recv( struct pt_regs * );
static int ppc_spurious_interrupts;

#if defined(CONFIG_PPC_ISERIES) && defined(CONFIG_SMP)
extern void iSeries_smp_message_recv(struct pt_regs *);
#endif

#ifdef CONFIG_PPC32
#define NR_MASK_WORDS ((NR_IRQS + 31) / 32)

unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
atomic_t ppc_n_lost_interrupts;

#ifdef CONFIG_TAU_INT
extern int tau_initialized;
extern int tau_interrupts(int);
#endif

#if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
extern atomic_t ipi_recv;
extern atomic_t ipi_sent;
#endif
#endif /* CONFIG_PPC32 */

extern irq_desc_t irq_desc[NR_IRQS];
#ifdef CONFIG_PPC64
EXPORT_SYMBOL(irq_desc);

int distribute_irqs = 1;
int __irq_offset_value;
int ppc_spurious_interrupts;
u64 ppc64_interrupt_controller;
#endif /* CONFIG_PPC64 */

int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v, j;
struct irqaction * action;
int i = *(loff_t *)v, j;
struct irqaction *action;
irq_desc_t *desc;
unsigned long flags;

if (i == 0) {
seq_printf(p, " ");
for (j=0; j<NR_CPUS; j++) {
if (cpu_online(j))
seq_printf(p, "CPU%d ",j);
}
seq_puts(p, " ");
for_each_online_cpu(j)
seq_printf(p, "CPU%d ", j);
seq_putc(p, '\n');
}

Expand All @@ -92,26 +124,41 @@ int show_interrupts(struct seq_file *p, void *v)
goto skip;
seq_printf(p, "%3d: ", i);
#ifdef CONFIG_SMP
for (j = 0; j < NR_CPUS; j++) {
if (cpu_online(j))
seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
}
for_each_online_cpu(j)
seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
#else
seq_printf(p, "%10u ", kstat_irqs(i));
#endif /* CONFIG_SMP */
if (desc->handler)
seq_printf(p, " %s ", desc->handler->typename );
seq_printf(p, " %s ", desc->handler->typename);
else
seq_printf(p, " None ");
seq_puts(p, " None ");
seq_printf(p, "%s", (desc->status & IRQ_LEVEL) ? "Level " : "Edge ");
seq_printf(p, " %s",action->name);
for (action=action->next; action; action = action->next)
seq_printf(p, " %s", action->name);
for (action = action->next; action; action = action->next)
seq_printf(p, ", %s", action->name);
seq_putc(p, '\n');
skip:
spin_unlock_irqrestore(&desc->lock, flags);
} else if (i == NR_IRQS)
} else if (i == NR_IRQS) {
#ifdef CONFIG_PPC32
#ifdef CONFIG_TAU_INT
if (tau_initialized){
seq_puts(p, "TAU: ");
for (j = 0; j < NR_CPUS; j++)
if (cpu_online(j))
seq_printf(p, "%10u ", tau_interrupts(j));
seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n");
}
#endif
#if defined(CONFIG_SMP) && !defined(CONFIG_PPC_MERGE)
/* should this be per processor send/receive? */
seq_printf(p, "IPI (recv/sent): %10u/%u\n",
atomic_read(&ipi_recv), atomic_read(&ipi_sent));
#endif
#endif /* CONFIG_PPC32 */
seq_printf(p, "BAD: %10u\n", ppc_spurious_interrupts);
}
return 0;
}

Expand Down Expand Up @@ -144,126 +191,6 @@ void fixup_irqs(cpumask_t map)
}
#endif

extern int noirqdebug;

/*
* Eventually, this should take an array of interrupts and an array size
* so it can dispatch multiple interrupts.
*/
void ppc_irq_dispatch_handler(struct pt_regs *regs, int irq)
{
int status;
struct irqaction *action;
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]++;

if (desc->status & IRQ_PER_CPU) {
/* no locking required for CPU-local interrupts: */
ack_irq(irq);
action_ret = handle_IRQ_event(irq, regs, desc->action);
desc->handler->end(irq);
return;
}

spin_lock(&desc->lock);
ack_irq(irq);
/*
REPLAY is when Linux resends an IRQ that was dropped earlier
WAITING is used by probe to mark irqs that are being tested
*/
status = desc->status & ~(IRQ_REPLAY | IRQ_WAITING);
status |= IRQ_PENDING; /* we _want_ to handle it */

/*
* If the IRQ is disabled for whatever reason, we cannot
* use the action we have.
*/
action = NULL;
if (likely(!(status & (IRQ_DISABLED | IRQ_INPROGRESS)))) {
action = desc->action;
if (!action || !action->handler) {
ppc_spurious_interrupts++;
printk(KERN_DEBUG "Unhandled interrupt %x, disabled\n", irq);
/* We can't call disable_irq here, it would deadlock */
if (!desc->depth)
desc->depth = 1;
desc->status |= IRQ_DISABLED;
/* This is not a real spurrious interrupt, we
* have to eoi it, so we jump to out
*/
mask_irq(irq);
goto out;
}
status &= ~IRQ_PENDING; /* we commit to handling */
status |= IRQ_INPROGRESS; /* we are handling it */
}
desc->status = status;

/*
* If there is no IRQ handler or it was disabled, exit early.
Since we set PENDING, if another processor is handling
a different instance of this same irq, the other processor
will take care of it.
*/
if (unlikely(!action))
goto out;

/*
* Edge triggered interrupts need to remember
* pending events.
* This applies to any hw interrupts that allow a second
* instance of the same irq to arrive while we are in do_IRQ
* or in the handler. But the code here only handles the _second_
* instance of the irq, not the third or fourth. So it is mostly
* useful for irq hardware that does not mask cleanly in an
* SMP environment.
*/
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);
if (!noirqdebug)
note_interrupt(irq, desc, action_ret, regs);
if (likely(!(desc->status & IRQ_PENDING)))
break;
desc->status &= ~IRQ_PENDING;
}
out:
desc->status &= ~IRQ_INPROGRESS;
/*
* The ->end() handler has to deal with interrupts which got
* disabled while the handler was running.
*/
if (desc->handler) {
if (desc->handler->end)
desc->handler->end(irq);
else if (desc->handler->enable)
desc->handler->enable(irq);
}
spin_unlock(&desc->lock);
}

#ifdef CONFIG_PPC_ISERIES
void do_IRQ(struct pt_regs *regs)
{
Expand Down Expand Up @@ -310,8 +237,11 @@ 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();
irq_enter();

#ifdef CONFIG_DEBUG_STACKOVERFLOW
/* Debugging check for stack overflow: is there less than 2KB free? */
Expand All @@ -328,31 +258,59 @@ void do_IRQ(struct pt_regs *regs)
}
#endif

/*
* Every platform is required to implement ppc_md.get_irq.
* This function will either return an irq number or -1 to
* indicate there are no more pending.
* The value -2 is for buggy hardware and means that this IRQ
* has already been handled. -- Tom
*/
irq = ppc_md.get_irq(regs);

if (irq >= 0)
ppc_irq_dispatch_handler(regs, irq);
else
/* That's not SMP safe ... but who cares ? */
ppc_spurious_interrupts++;

irq_exit();
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___do_IRQ(irq, regs, irqtp);
irqtp->task = NULL;
if (irqtp->flags)
set_bits(irqtp->flags, &curtp->flags);
} else
#endif
__do_IRQ(irq, regs);
} else
#ifdef CONFIG_PPC32
if (irq != -2)
#endif
/* That's not SMP safe ... but who cares ? */
ppc_spurious_interrupts++;
irq_exit();
}

#endif /* CONFIG_PPC_ISERIES */

void __init init_IRQ(void)
{
#ifdef CONFIG_PPC64
static int once = 0;

if (once)
return;

once++;

#endif
ppc_md.init_IRQ();
#ifdef CONFIG_PPC64
irq_ctx_init();
#endif
}

#ifdef CONFIG_PPC64
#ifndef CONFIG_PPC_ISERIES
/*
* Virtual IRQ mapping code, used on systems with XICS interrupt controllers.
Expand Down Expand Up @@ -517,3 +475,4 @@ static int __init setup_noirqdistrib(char *str)
}

__setup("noirqdistrib", setup_noirqdistrib);
#endif /* CONFIG_PPC64 */
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