[RFC Part2 v1 07/21] x86, uv: Use new irqdomain interfaces to allocate/free IRQ

[Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>]

Use new irqdomain interfaces to allocate/free IRQ, so we could
kill GENERIC_IRQ_LEGACY_ALLOC_HWIRQ later.

Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
---
 arch/x86/platform/uv/uv_irq.c |   27 +++++++++++----------------
 1 file changed, 11 insertions(+), 16 deletions(-)

diff --git a/arch/x86/platform/uv/uv_irq.c b/arch/x86/platform/uv/uv_irq.c
index 0ce673645432..74871ead5a30 100644
--- a/arch/x86/platform/uv/uv_irq.c
+++ b/arch/x86/platform/uv/uv_irq.c
@@ -12,6 +12,7 @@
 #include <linux/rbtree.h>
 #include <linux/slab.h>
 #include <linux/irq.h>
+#include <linux/irqdomain.h>
 
 #include <asm/apic.h>
 #include <asm/uv/uv_irq.h>
@@ -130,24 +131,14 @@ static int
 arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
 		       unsigned long mmr_offset, int limit)
 {
-	const struct cpumask *eligible_cpu = cpumask_of(cpu);
 	struct irq_cfg *cfg = irq_cfg(irq);
 	unsigned long mmr_value;
 	struct uv_IO_APIC_route_entry *entry;
-	int mmr_pnode, err;
-	unsigned int dest;
+	int mmr_pnode;
 
 	BUILD_BUG_ON(sizeof(struct uv_IO_APIC_route_entry) !=
 			sizeof(unsigned long));
 
-	err = assign_irq_vector(irq, cfg, eligible_cpu);
-	if (err != 0)
-		return err;
-
-	err = apic->cpu_mask_to_apicid_and(eligible_cpu, eligible_cpu, &dest);
-	if (err != 0)
-		return err;
-
 	if (limit == UV_AFFINITY_CPU)
 		irq_set_status_flags(irq, IRQ_NO_BALANCING);
 	else
@@ -164,7 +155,7 @@ arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade,
 	entry->polarity		= 0;
 	entry->trigger		= 0;
 	entry->mask		= 0;
-	entry->dest		= dest;
+	entry->dest		= cfg->dest_apicid;
 
 	mmr_pnode = uv_blade_to_pnode(mmr_blade);
 	uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value);
@@ -238,9 +229,13 @@ uv_set_irq_affinity(struct irq_data *data, const struct cpumask *mask,
 int uv_setup_irq(char *irq_name, int cpu, int mmr_blade,
 		 unsigned long mmr_offset, int limit)
 {
-	int ret, irq = irq_alloc_hwirq(uv_blade_to_memory_nid(mmr_blade));
+	int ret, irq;
+	struct irq_alloc_info info;
 
-	if (!irq)
+	init_irq_alloc_info(&info, cpumask_of(cpu));
+	irq = irq_domain_alloc_irqs(NULL, -1, 1,
+				    uv_blade_to_memory_nid(mmr_blade), &info);
+	if (irq <= 0)
 		return -EBUSY;
 
 	ret = arch_enable_uv_irq(irq_name, irq, cpu, mmr_blade, mmr_offset,
@@ -248,7 +243,7 @@ int uv_setup_irq(char *irq_name, int cpu, int mmr_blade,
 	if (ret == irq)
 		uv_set_irq_2_mmr_info(irq, mmr_offset, mmr_blade);
 	else
-		irq_free_hwirq(irq);
+		irq_domain_free_irqs(irq, 1);
 
 	return ret;
 }
@@ -283,6 +278,6 @@ void uv_teardown_irq(unsigned int irq)
 			n = n->rb_right;
 	}
 	spin_unlock_irqrestore(&uv_irq_lock, irqflags);
-	irq_free_hwirq(irq);
+	irq_domain_free_irqs(irq, 1);
 }
 EXPORT_SYMBOL_GPL(uv_teardown_irq);
-- 
1.7.10.4

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