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powerpc/cpumask: Convert xics driver to new cpumask API

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Use the new cpumask API and add some comments to clarify how get_irq_server
works.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2010-04-26 15:32:38 +00:00 committed by Benjamin Herrenschmidt
parent af831e1e44
commit 64fe220c13
1 changed files with 21 additions and 17 deletions
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38
arch/powerpc/platforms/pseries/xics.c
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@ -163,29 +163,37 @@ static inline void lpar_qirr_info(int n_cpu , u8 value)
/* Interface to generic irq subsystem */
#ifdef CONFIG_SMP
static int get_irq_server(unsigned int virq, cpumask_t cpumask,
/*
* For the moment we only implement delivery to all cpus or one cpu.
*
* If the requested affinity is cpu_all_mask, we set global affinity.
* If not we set it to the first cpu in the mask, even if multiple cpus
* are set. This is so things like irqbalance (which set core and package
* wide affinities) do the right thing.
*/
static int get_irq_server(unsigned int virq, const struct cpumask *cpumask,
unsigned int strict_check)
{
int server;
/* For the moment only implement delivery to all cpus or one cpu */
cpumask_t tmp = CPU_MASK_NONE;
if (!distribute_irqs)
return default_server;
if (!cpus_equal(cpumask, CPU_MASK_ALL)) {
cpus_and(tmp, cpu_online_map, cpumask);
if (!cpumask_equal(cpumask, cpu_all_mask)) {
int server = cpumask_first_and(cpu_online_mask, cpumask);
server = first_cpu(tmp);
if (server < NR_CPUS)
if (server < nr_cpu_ids)
return get_hard_smp_processor_id(server);
if (strict_check)
return -1;
}
if (cpus_equal(cpu_online_map, cpu_present_map))
/*
* Workaround issue with some versions of JS20 firmware that
* deliver interrupts to cpus which haven't been started. This
* happens when using the maxcpus= boot option.
*/
if (cpumask_equal(cpu_online_mask, cpu_present_mask))
return default_distrib_server;
return default_server;
@ -207,7 +215,7 @@ static void xics_unmask_irq(unsigned int virq)
if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS)
return;
server = get_irq_server(virq, *(irq_to_desc(virq)->affinity), 0);
server = get_irq_server(virq, irq_to_desc(virq)->affinity, 0);
call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, server,
DEFAULT_PRIORITY);
@ -398,11 +406,7 @@ static int xics_set_affinity(unsigned int virq, const struct cpumask *cpumask)
return -1;
}
/*
* For the moment only implement delivery to all cpus or one cpu.
* Get current irq_server for the given irq
*/
irq_server = get_irq_server(virq, *cpumask, 1);
irq_server = get_irq_server(virq, cpumask, 1);
if (irq_server == -1) {
char cpulist[128];
cpumask_scnprintf(cpulist, sizeof(cpulist), cpumask);
@ -611,7 +615,7 @@ int __init smp_xics_probe(void)
{
xics_request_ipi();
return cpus_weight(cpu_possible_map);
return cpumask_weight(cpu_possible_mask);
}
#endif /* CONFIG_SMP */