Introduce several helper functions, which will be used to enable
hierarchy irqdomain for IOAPIC.
Signed-off-by: Jiang Liu <jiang....@linux.intel.com>
Tested-by: Joerg Roedel <jroe...@suse.de>
---
arch/x86/kernel/apic/io_apic.c | 59 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 59 insertions(+)
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index b2618d48d572..721be8ce77c8 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -67,6 +67,8 @@
#define for_each_irq_pin(entry, head) \
list_for_each_entry(entry, &head, list)
+int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity);
+
/*
* Is the SiS APIC rmw bug present ?
* -1 = don't know, 0 = no, 1 = yes
@@ -82,6 +84,7 @@ struct mp_chip_data {
struct IO_APIC_route_entry entry;
int trigger;
int polarity;
+ u32 count;
bool isa_irq;
};
@@ -945,6 +948,42 @@ void ioapic_set_alloc_attr(struct irq_alloc_info *info,
int node,
info->ioapic_valid = 1;
}
+static void ioapic_copy_alloc_attr(struct irq_alloc_info *dst,
+ struct irq_alloc_info *src,
+ u32 gsi, int ioapic_idx, int pin)
+{
+ int trigger, polarity;
+
+ copy_irq_alloc_info(dst, src);
+ dst->type = X86_IRQ_ALLOC_TYPE_IOAPIC;
+ dst->ioapic_id = mpc_ioapic_id(ioapic_idx);
+ dst->ioapic_pin = pin;
+ dst->ioapic_valid = 1;
+ if (src && src->ioapic_valid) {
+ dst->ioapic_node = src->ioapic_node;
+ dst->ioapic_trigger = src->ioapic_trigger;
+ dst->ioapic_polarity = src->ioapic_polarity;
+ } else {
+ dst->ioapic_node = NUMA_NO_NODE;
+ if (acpi_get_override_irq(gsi, &trigger, &polarity) >= 0) {
+ dst->ioapic_trigger = trigger;
+ dst->ioapic_polarity = polarity;
+ } else {
+ /*
+ * PCI interrupts are always polarity one level
+ * triggered.
+ */
+ dst->ioapic_trigger = 1;
+ dst->ioapic_polarity = 1;
+ }
+ }
+}
+
+static int ioapic_alloc_attr_node(struct irq_alloc_info *info)
+{
+ return (info && info->ioapic_valid) ? info->ioapic_node : NUMA_NO_NODE;
+}
+
static void mp_register_handler(unsigned int irq, unsigned long trigger)
{
irq_flow_handler_t hdl;
@@ -962,6 +1001,26 @@ static void mp_register_handler(unsigned int irq,
unsigned long trigger)
__irq_set_handler(irq, hdl, 0, fasteoi ? "fasteoi" : "edge");
}
+static bool mp_check_pin_attr(int irq, struct irq_alloc_info *info)
+{
+ struct mp_chip_data *data = irq_get_chip_data(irq);
+
+ /*
+ * setup_IO_APIC_irqs() programs all legacy IRQs with default trigger
+ * and polarity attirbutes. So allow the first user to reprogram the
+ * pin with real trigger and polarity attributes.
+ */
+ if (irq < nr_legacy_irqs() && data->count == 1) {
+ if (info->ioapic_trigger != data->trigger)
+ mp_register_handler(irq, data->trigger);
+ data->entry.trigger = data->trigger = info->ioapic_trigger;
+ data->entry.polarity = data->polarity = info->ioapic_polarity;
+ }
+
+ return data->trigger == info->ioapic_trigger &&
+ data->polarity == info->ioapic_polarity;
+}
+
static int alloc_irq_from_domain(struct irq_domain *domain, u32 gsi, int pin,
struct irq_alloc_info *info)
{
--
1.7.10.4
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