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MIPS: Octeon: Fix fixup_irqs for HOTPLUG_CPU 

The original version went behind the back of everything, leaving
things in an inconsistent state.

Now we use the irq_set_affinity() to do the work for us.  This has the
advantage that the IRQ core's view of the affinity stays consistent.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1486/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney 2010-07-23 10:43:47 -07:00 committed by Ralf Baechle
parent 5aae1fd4d4
commit 3508920f58
1 changed files with 69 additions and 39 deletions
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108
arch/mips/cavium-octeon/octeon-irq.c
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@ -788,54 +788,84 @@ asmlinkage void plat_irq_dispatch(void)
}
#ifdef CONFIG_HOTPLUG_CPU
static int is_irq_enabled_on_cpu(unsigned int irq, unsigned int cpu)
{
unsigned int isset;
int coreid = octeon_coreid_for_cpu(cpu);
int bit = (irq < OCTEON_IRQ_WDOG0) ?
irq - OCTEON_IRQ_WORKQ0 : irq - OCTEON_IRQ_WDOG0;
if (irq < 64) {
isset = (cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2)) &
(1ull << bit)) >> bit;
} else {
isset = (cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1)) &
(1ull << bit)) >> bit;
}
return isset;
}
void fixup_irqs(void)
{
int irq;
int irq;
struct irq_desc *desc;
cpumask_t new_affinity;
unsigned long flags;
int do_set_affinity;
int cpu;
cpu = smp_processor_id();
for (irq = OCTEON_IRQ_SW0; irq <= OCTEON_IRQ_TIMER; irq++)
octeon_irq_core_disable_local(irq);
for (irq = OCTEON_IRQ_WORKQ0; irq <= OCTEON_IRQ_GPIO15; irq++) {
if (is_irq_enabled_on_cpu(irq, smp_processor_id())) {
/* ciu irq migrates to next cpu */
octeon_irq_chip_ciu0.disable(irq);
octeon_irq_ciu0_set_affinity(irq, &cpu_online_map);
}
}
for (irq = OCTEON_IRQ_WORKQ0; irq < OCTEON_IRQ_LAST; irq++) {
desc = irq_to_desc(irq);
switch (irq) {
case OCTEON_IRQ_MBOX0:
case OCTEON_IRQ_MBOX1:
/* The eoi function will disable them on this CPU. */
desc->chip->eoi(irq);
break;
case OCTEON_IRQ_WDOG0:
case OCTEON_IRQ_WDOG1:
case OCTEON_IRQ_WDOG2:
case OCTEON_IRQ_WDOG3:
case OCTEON_IRQ_WDOG4:
case OCTEON_IRQ_WDOG5:
case OCTEON_IRQ_WDOG6:
case OCTEON_IRQ_WDOG7:
case OCTEON_IRQ_WDOG8:
case OCTEON_IRQ_WDOG9:
case OCTEON_IRQ_WDOG10:
case OCTEON_IRQ_WDOG11:
case OCTEON_IRQ_WDOG12:
case OCTEON_IRQ_WDOG13:
case OCTEON_IRQ_WDOG14:
case OCTEON_IRQ_WDOG15:
/*
* These have special per CPU semantics and
* are handled in the watchdog driver.
*/
break;
default:
raw_spin_lock_irqsave(&desc->lock, flags);
/*
* If this irq has an action, it is in use and
* must be migrated if it has affinity to this
* cpu.
*/
if (desc->action && cpumask_test_cpu(cpu, desc->affinity)) {
if (cpumask_weight(desc->affinity) > 1) {
/*
* It has multi CPU affinity,
* just remove this CPU from
* the affinity set.
*/
cpumask_copy(&new_affinity, desc->affinity);
cpumask_clear_cpu(cpu, &new_affinity);
} else {
/*
* Otherwise, put it on lowest
* numbered online CPU.
*/
cpumask_clear(&new_affinity);
cpumask_set_cpu(cpumask_first(cpu_online_mask), &new_affinity);
}
do_set_affinity = 1;
} else {
do_set_affinity = 0;
}
raw_spin_unlock_irqrestore(&desc->lock, flags);
#if 0
for (irq = OCTEON_IRQ_MBOX0; irq <= OCTEON_IRQ_MBOX1; irq++)
octeon_irq_mailbox_mask(irq);
#endif
for (irq = OCTEON_IRQ_UART0; irq <= OCTEON_IRQ_BOOTDMA; irq++) {
if (is_irq_enabled_on_cpu(irq, smp_processor_id())) {
/* ciu irq migrates to next cpu */
octeon_irq_chip_ciu0.disable(irq);
octeon_irq_ciu0_set_affinity(irq, &cpu_online_map);
}
}
if (do_set_affinity)
irq_set_affinity(irq, &new_affinity);
for (irq = OCTEON_IRQ_UART2; irq <= OCTEON_IRQ_RESERVED135; irq++) {
if (is_irq_enabled_on_cpu(irq, smp_processor_id())) {
/* ciu irq migrates to next cpu */
octeon_irq_chip_ciu1.disable(irq);
octeon_irq_ciu1_set_affinity(irq, &cpu_online_map);
break;
}
}
}