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Diffstat (limited to 'kernel/irq/chip.c')
-rw-r--r--kernel/irq/chip.c64
1 files changed, 61 insertions, 3 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index b7599e952d3b..fc89eeb8a6b4 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -195,6 +195,52 @@ static void irq_state_set_started(struct irq_desc *desc)
irqd_set(&desc->irq_data, IRQD_IRQ_STARTED);
}
+enum {
+ IRQ_STARTUP_NORMAL,
+ IRQ_STARTUP_MANAGED,
+ IRQ_STARTUP_ABORT,
+};
+
+#ifdef CONFIG_SMP
+static int
+__irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
+{
+ struct irq_data *d = irq_desc_get_irq_data(desc);
+
+ if (!irqd_affinity_is_managed(d))
+ return IRQ_STARTUP_NORMAL;
+
+ irqd_clr_managed_shutdown(d);
+
+ if (cpumask_any_and(aff, cpu_online_mask) > nr_cpu_ids) {
+ /*
+ * Catch code which fiddles with enable_irq() on a managed
+ * and potentially shutdown IRQ. Chained interrupt
+ * installment or irq auto probing should not happen on
+ * managed irqs either. Emit a warning, break the affinity
+ * and start it up as a normal interrupt.
+ */
+ if (WARN_ON_ONCE(force))
+ return IRQ_STARTUP_NORMAL;
+ /*
+ * The interrupt was requested, but there is no online CPU
+ * in it's affinity mask. Put it into managed shutdown
+ * state and let the cpu hotplug mechanism start it up once
+ * a CPU in the mask becomes available.
+ */
+ irqd_set_managed_shutdown(d);
+ return IRQ_STARTUP_ABORT;
+ }
+ return IRQ_STARTUP_MANAGED;
+}
+#else
+static int
+__irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
+{
+ return IRQ_STARTUP_NORMAL;
+}
+#endif
+
static int __irq_startup(struct irq_desc *desc)
{
struct irq_data *d = irq_desc_get_irq_data(desc);
@@ -214,15 +260,27 @@ static int __irq_startup(struct irq_desc *desc)
int irq_startup(struct irq_desc *desc, bool resend, bool force)
{
+ struct irq_data *d = irq_desc_get_irq_data(desc);
+ struct cpumask *aff = irq_data_get_affinity_mask(d);
int ret = 0;
desc->depth = 0;
- if (irqd_is_started(&desc->irq_data)) {
+ if (irqd_is_started(d)) {
irq_enable(desc);
} else {
- ret = __irq_startup(desc);
- irq_setup_affinity(desc);
+ switch (__irq_startup_managed(desc, aff, force)) {
+ case IRQ_STARTUP_NORMAL:
+ ret = __irq_startup(desc);
+ irq_setup_affinity(desc);
+ break;
+ case IRQ_STARTUP_MANAGED:
+ ret = __irq_startup(desc);
+ irq_set_affinity_locked(d, aff, false);
+ break;
+ case IRQ_STARTUP_ABORT:
+ return 0;
+ }
}
if (resend)
check_irq_resend(desc);