iommu/vt-d: Refine the interfaces to create IRQ for DMAR unit

Refine the interfaces to create IRQ for DMAR unit. It's a preparation
for converting DMAR IRQ to hierarchical irqdomain on x86.

It also moves dmar_alloc_hwirq()/dmar_free_hwirq() from irq_remapping.h
to dmar.h. They are not irq_remapping specific.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: David Cohen <david.a.cohen@linux.intel.com>
Cc: Sander Eikelenboom <linux@eikelenboom.it>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: iommu@lists.linux-foundation.org
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dimitri Sivanich <sivanich@sgi.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Link: http://lkml.kernel.org/r/1428905519-23704-20-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 13 insertions, 15 deletions

diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index b978c68f5d29..bacac1052262 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -117,8 +117,4 @@ irq_remapping_get_irq_domain(struct irq_alloc_info *info)
 
 #define	irq_remapping_print_chip	NULL
 #endif /* CONFIG_IRQ_REMAP */
-
-extern int dmar_alloc_hwirq(void);
-extern void dmar_free_hwirq(int irq);
-
 #endif /* __X86_IRQ_REMAPPING_H */
diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 9fe7a08479fa..ca6250439acc 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -228,25 +228,27 @@ static struct irq_chip dmar_msi_type = {
 	.flags			= IRQCHIP_SKIP_SET_WAKE,
 };
 
-int arch_setup_dmar_msi(unsigned int irq)
+int dmar_alloc_hwirq(int id, int node, void *arg)
 {
+	int irq;
 	struct msi_msg msg;
-	struct irq_cfg *cfg = irq_cfg(irq);
 
-	native_compose_msi_msg(cfg, &msg);
-	dmar_msi_write(irq, &msg);
-	irq_set_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
-				      "edge");
-	return 0;
-}
+	irq = irq_domain_alloc_irqs(NULL, 1, node, NULL);
+	if (irq > 0) {
+		irq_set_handler_data(irq, arg);
+		irq_set_chip_and_handler_name(irq, &dmar_msi_type,
+					      handle_edge_irq, "edge");
+		native_compose_msi_msg(irq_cfg(irq), &msg);
+		dmar_msi_write(irq, &msg);
+	}
 
-int dmar_alloc_hwirq(void)
-{
-	return irq_domain_alloc_irqs(NULL, 1, NUMA_NO_NODE, NULL);
+	return irq;
 }
 
 void dmar_free_hwirq(int irq)
 {
+	irq_set_handler_data(irq, NULL);
+	irq_set_handler(irq, NULL);
 	irq_domain_free_irqs(irq, 1);
 }
 #endif