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[POWERPC] ps3: cleanup interrupt bmp routines

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Change the PS3 interrupt bitmask routines to be lockless.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Acked-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt 2007-01-26 19:08:05 -08:00 committed by Paul Mackerras
parent 407e24a0c7
commit 9cf9e19667
1 changed files with 38 additions and 47 deletions
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85
arch/powerpc/platforms/ps3/interrupt.c
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@ -380,34 +380,50 @@ static void dump_bmp(struct ps3_private* pd) {};
static void ps3_chip_mask(unsigned int virq)
{
unsigned long flags;
struct ps3_private *pd = get_irq_chip_data(virq);
unsigned long bit = 0x8000000000000000UL >> virq;
unsigned long *p = &pd->bmp.mask;
unsigned long old;
unsigned long flags;
pr_debug("%s:%d: cpu %u, virq %d\n", __func__, __LINE__, pd->cpu, virq);
BUG_ON(virq < NUM_ISA_INTERRUPTS);
BUG_ON(virq > PS3_PLUG_MAX);
local_irq_save(flags);
asm volatile(
"1: ldarx %0,0,%3\n"
"andc %0,%0,%2\n"
"stdcx. %0,0,%3\n"
"bne- 1b"
: "=&r" (old), "+m" (*p)
: "r" (bit), "r" (p)
: "cc" );
spin_lock_irqsave(&pd->bmp.lock, flags);
pd->bmp.mask &= ~(0x8000000000000000UL >> virq);
lv1_did_update_interrupt_mask(pd->node, pd->cpu);
spin_unlock_irqrestore(&pd->bmp.lock, flags);
local_irq_restore(flags);
}
static void ps3_chip_unmask(unsigned int virq)
{
unsigned long flags;
struct ps3_private *pd = get_irq_chip_data(virq);
unsigned long bit = 0x8000000000000000UL >> virq;
unsigned long *p = &pd->bmp.mask;
unsigned long old;
unsigned long flags;
pr_debug("%s:%d: cpu %u, virq %d\n", __func__, __LINE__, pd->cpu, virq);
BUG_ON(virq < NUM_ISA_INTERRUPTS);
BUG_ON(virq > PS3_PLUG_MAX);
local_irq_save(flags);
asm volatile(
"1: ldarx %0,0,%3\n"
"or %0,%0,%2\n"
"stdcx. %0,0,%3\n"
"bne- 1b"
: "=&r" (old), "+m" (*p)
: "r" (bit), "r" (p)
: "cc" );
spin_lock_irqsave(&pd->bmp.lock, flags);
pd->bmp.mask |= (0x8000000000000000UL >> virq);
lv1_did_update_interrupt_mask(pd->node, pd->cpu);
spin_unlock_irqrestore(&pd->bmp.lock, flags);
local_irq_restore(flags);
}
static void ps3_chip_eoi(unsigned int virq)
@ -481,46 +497,21 @@ void __init ps3_register_ipi_debug_brk(unsigned int cpu, unsigned int virq)
cpu, virq, pd->bmp.ipi_debug_brk_mask);
}
static int bmp_get_and_clear_status_bit(struct ps3_bmp *m)
unsigned int ps3_get_irq(void)
{
unsigned long flags;
unsigned int bit;
unsigned long x;
spin_lock_irqsave(&m->lock, flags);
struct ps3_private *pd = &__get_cpu_var(ps3_private);
unsigned long x = (pd->bmp.status & pd->bmp.mask);
unsigned int plug;
/* check for ipi break first to stop this cpu ASAP */
if (m->status & m->ipi_debug_brk_mask) {
m->status &= ~m->ipi_debug_brk_mask;
spin_unlock_irqrestore(&m->lock, flags);
return __ilog2(m->ipi_debug_brk_mask);
}
if (x & pd->bmp.ipi_debug_brk_mask)
x &= pd->bmp.ipi_debug_brk_mask;
x = (m->status & m->mask);
asm volatile("cntlzd %0,%1" : "=r" (plug) : "r" (x));
plug &= 0x3f;
for (bit = NUM_ISA_INTERRUPTS, x <<= bit; x; bit++, x <<= 1)
if (x & 0x8000000000000000UL) {
m->status &= ~(0x8000000000000000UL >> bit);
spin_unlock_irqrestore(&m->lock, flags);
return bit;
}
spin_unlock_irqrestore(&m->lock, flags);
pr_debug("%s:%d: not found\n", __func__, __LINE__);
return -1;
}
unsigned int ps3_get_irq(void)
{
int plug;
struct ps3_private *pd = &__get_cpu_var(ps3_private);
plug = bmp_get_and_clear_status_bit(&pd->bmp);
if (plug < 1) {
if (unlikely(plug) == NO_IRQ) {
pr_debug("%s:%d: no plug found: cpu %u\n", __func__, __LINE__,
pd->cpu);
dump_bmp(&per_cpu(ps3_private, 0));
@ -529,7 +520,7 @@ unsigned int ps3_get_irq(void)
}
#if defined(DEBUG)
if (plug < NUM_ISA_INTERRUPTS || plug > PS3_PLUG_MAX) {
if (unlikely(plug < NUM_ISA_INTERRUPTS || plug > PS3_PLUG_MAX)) {
dump_bmp(&per_cpu(ps3_private, 0));
dump_bmp(&per_cpu(ps3_private, 1));
BUG();