2 files changed, 103 insertions, 1 deletions

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 3e4bea3..c535878 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -173,7 +173,9 @@ enum ioapic_domain_type {
 };
 
 struct device_node;
+struct irq_domain;
 struct irq_domain_ops;
+
 struct ioapic_domain_cfg {
 	enum ioapic_domain_type		type;
 	const struct irq_domain_ops	*ops;
@@ -192,6 +194,9 @@ extern u32 mp_pin_to_gsi(int ioapic, int pin);
 extern int mp_map_gsi_to_irq(u32 gsi, unsigned int flags);
 extern void __init mp_register_ioapic(int id, u32 address, u32 gsi_base,
 				      struct ioapic_domain_cfg *cfg);
+extern int mp_irqdomain_map(struct irq_domain *domain, unsigned int virq,
+			    irq_hw_number_t hwirq);
+extern int mp_set_gsi_attr(u32 gsi, int trigger, int polarity, int node);
 extern void __init pre_init_apic_IRQ0(void);
 
 extern void mp_save_irq(struct mpc_intsrc *m);
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 563f450..a602b35 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -87,6 +87,14 @@ static DEFINE_RAW_SPINLOCK(vector_lock);
 static DEFINE_MUTEX(ioapic_mutex);
 static unsigned int ioapic_dynirq_base;
 
+struct mp_pin_info {
+	int trigger;
+	int polarity;
+	int node;
+	int set;
+	u32 count;
+};
+
 static struct ioapic {
 	/*
 	 * # of IRQ routing registers
@@ -102,6 +110,7 @@ static struct ioapic {
 	struct mp_ioapic_gsi  gsi_config;
 	struct ioapic_domain_cfg irqdomain_cfg;
 	struct irq_domain *irqdomain;
+	struct mp_pin_info *pin_info;
 	DECLARE_BITMAP(pin_programmed, MP_MAX_IOAPIC_PIN + 1);
 } ioapics[MAX_IO_APICS];
 
@@ -147,6 +156,11 @@ static inline int mp_init_irq_at_boot(int ioapic, int irq)
 	return ioapic == 0 || (irq >= 0 && irq < nr_legacy_irqs());
 }
 
+static inline struct mp_pin_info *mp_pin_info(int ioapic_idx, int pin)
+{
+	return ioapics[ioapic_idx].pin_info + pin;
+}
+
 static inline struct irq_domain *mp_ioapic_irqdomain(int ioapic)
 {
 	return ioapics[ioapic].irqdomain;
@@ -1006,6 +1020,7 @@ static int mp_map_pin_to_irq(u32 gsi, int idx, int ioapic, int pin,
 {
 	int irq;
 	struct irq_domain *domain = mp_ioapic_irqdomain(ioapic);
+	struct mp_pin_info *info = mp_pin_info(ioapic, pin);
 
 	/*
 	 * Don't use irqdomain to manage ISA IRQs because there may be
@@ -1034,6 +1049,13 @@ static int mp_map_pin_to_irq(u32 gsi, int idx, int ioapic, int pin,
 	irq = irq_find_mapping(domain, pin);
 	if (irq <= 0 && (flags & IOAPIC_MAP_ALLOC))
 		irq = alloc_irq_from_domain(domain, gsi, pin);
+
+	if (flags & IOAPIC_MAP_ALLOC) {
+		if (irq > 0)
+			info->count++;
+		else if (info->count == 0)
+			info->set = 0;
+	}
 	mutex_unlock(&ioapic_mutex);
 
 	return irq > 0 ? irq : -1;
@@ -2923,18 +2945,27 @@ out:
 
 static int mp_irqdomain_create(int ioapic)
 {
+	size_t size;
 	int hwirqs = mp_ioapic_pin_count(ioapic);
 	struct ioapic *ip = &ioapics[ioapic];
 	struct ioapic_domain_cfg *cfg = &ip->irqdomain_cfg;
 	struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
 
+	size = sizeof(struct mp_pin_info) * mp_ioapic_pin_count(ioapic);
+	ip->pin_info = kzalloc(size, GFP_KERNEL);
+	if (!ip->pin_info)
+		return -ENOMEM;
+
 	if (cfg->type == IOAPIC_DOMAIN_INVALID)
 		return 0;
 
 	ip->irqdomain = irq_domain_add_linear(cfg->dev, hwirqs, cfg->ops,
 					      (void *)(long)ioapic);
-	if(!ip->irqdomain)
+	if(!ip->irqdomain) {
+		kfree(ip->pin_info);
+		ip->pin_info = NULL;
 		return -ENOMEM;
+	}
 
 	if (cfg->type == IOAPIC_DOMAIN_LEGACY ||
 	    cfg->type == IOAPIC_DOMAIN_STRICT)
@@ -3902,6 +3933,72 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base,
 	nr_ioapics++;
 }
 
+int mp_irqdomain_map(struct irq_domain *domain, unsigned int virq,
+		     irq_hw_number_t hwirq)
+{
+	int ioapic = (int)(long)domain->host_data;
+	struct mp_pin_info *info = mp_pin_info(ioapic, hwirq);
+	struct io_apic_irq_attr attr;
+
+	/*
+	 * Skip the timer IRQ if there's a quirk handler installed and if it
+	 * returns 1:
+	 */
+	if (apic->multi_timer_check &&
+	    apic->multi_timer_check(ioapic, virq))
+		return 0;
+
+	/* Get default attribute if not set by caller yet */
+	if (!info->set) {
+		u32 gsi = mp_pin_to_gsi(ioapic, hwirq);
+
+		if (acpi_get_override_irq(gsi, &info->trigger,
+					  &info->polarity) < 0) {
+			/*
+			 * PCI interrupts are always polarity one level
+			 * triggered.
+			 */
+			info->trigger = 1;
+			info->polarity = 1;
+		}
+		info->node = NUMA_NO_NODE;
+		info->set = 1;
+	}
+	set_io_apic_irq_attr(&attr, ioapic, hwirq, info->trigger,
+			     info->polarity);
+
+	return io_apic_setup_irq_pin(virq, info->node, &attr);
+}
+
+int mp_set_gsi_attr(u32 gsi, int trigger, int polarity, int node)
+{
+	int ret = 0;
+	int ioapic, pin;
+	struct mp_pin_info *info;
+
+	ioapic = mp_find_ioapic(gsi);
+	if (ioapic < 0)
+		return -ENODEV;
+
+	pin = mp_find_ioapic_pin(ioapic, gsi);
+	info = mp_pin_info(ioapic, pin);
+	trigger = trigger ? 1 : 0;
+	polarity = polarity ? 1 : 0;
+
+	mutex_lock(&ioapic_mutex);
+	if (!info->set) {
+		info->trigger = trigger;
+		info->polarity = polarity;
+		info->node = node;
+		info->set = 1;
+	} else if (info->trigger != trigger || info->polarity != polarity) {
+		ret = -EBUSY;
+	}
+	mutex_unlock(&ioapic_mutex);
+
+	return ret;
+}
+
 /* Enable IOAPIC early just for system timer */
 void __init pre_init_apic_IRQ0(void)
 {