[Patch Part3 v3 08/38] x86, irq: Introduce helper functions to support hierarchy irqdomain for IOAPIC

[Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>]

Introduce several helper functions, which will be used to enable
hierarchy irqdomain for IOAPIC.

Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
---
 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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