[Patch V3 23/37] x86, SFI, irq: provide basic irqdomain support

[Jiang Liu]

Enhance SFI to provide basic support of irqdomain with identity mapping
between GSIs and IRQs.

Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
---
 arch/x86/pci/intel_mid_pci.c      |    3 +++
 arch/x86/platform/intel-mid/sfi.c |    2 ++
 arch/x86/platform/sfi/sfi.c       |   11 ++++++++++-
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/x86/pci/intel_mid_pci.c b/arch/x86/pci/intel_mid_pci.c
index 84b9d672843d..fcbdc5fac2c6 100644
--- a/arch/x86/pci/intel_mid_pci.c
+++ b/arch/x86/pci/intel_mid_pci.c
@@ -217,6 +217,9 @@ static int intel_mid_pci_irq_enable(struct pci_dev *dev)
 	 * MRST only have IOAPIC, the PCI irq lines are 1:1 mapped to
 	 * IOAPIC RTE entries, so we just enable RTE for the device.
 	 */
+	if (mp_map_gsi_to_irq(dev->irq, IOAPIC_MAP_ALLOC) < 0)
+		return -EBUSY;
+
 	irq_attr.ioapic = mp_find_ioapic(dev->irq);
 	irq_attr.ioapic_pin = dev->irq;
 	irq_attr.trigger = 1; /* level */
diff --git a/arch/x86/platform/intel-mid/sfi.c b/arch/x86/platform/intel-mid/sfi.c
index 994c40bd7cb7..7161395e7de7 100644
--- a/arch/x86/platform/intel-mid/sfi.c
+++ b/arch/x86/platform/intel-mid/sfi.c
@@ -473,6 +473,8 @@ static int __init sfi_parse_devs(struct sfi_table_header *table)
 					/* PNW and CLV go with active low */
 					irq_attr.polarity = 1;
 				}
+				WARN_ON(mp_map_gsi_to_irq(irq,
+						IOAPIC_MAP_ALLOC) < 0);
 				io_apic_set_pci_routing(NULL, irq, &irq_attr);
 			}
 		} else {
diff --git a/arch/x86/platform/sfi/sfi.c b/arch/x86/platform/sfi/sfi.c
index 3bd7cf642680..cda31be8dbe5 100644
--- a/arch/x86/platform/sfi/sfi.c
+++ b/arch/x86/platform/sfi/sfi.c
@@ -25,6 +25,7 @@
 #include <linux/init.h>
 #include <linux/sfi.h>
 #include <linux/io.h>
+#include <linux/irqdomain.h>
 
 #include <asm/io_apic.h>
 #include <asm/mpspec.h>
@@ -70,6 +71,13 @@ static int __init sfi_parse_cpus(struct sfi_table_header *table)
 #endif /* CONFIG_X86_LOCAL_APIC */
 
 #ifdef CONFIG_X86_IO_APIC
+static struct irq_domain_ops sfi_ioapic_irqdomain_ops;
+
+static struct irq_domain *sfi_ioapic_create_irqdomain(int ioapic, void *arg)
+{
+	ioapic_identity_map = 1;
+	return mp_irqdomain_create(ioapic, NULL, &sfi_ioapic_irqdomain_ops);
+}
 
 static int __init sfi_parse_ioapic(struct sfi_table_header *table)
 {
@@ -82,7 +90,8 @@ static int __init sfi_parse_ioapic(struct sfi_table_header *table)
 	pentry = (struct sfi_apic_table_entry *)sb->pentry;
 
 	for (i = 0; i < num; i++) {
-		mp_register_ioapic(i, pentry->phys_addr, gsi_top, NULL, NULL);
+		mp_register_ioapic(i, pentry->phys_addr, gsi_top,
+				   sfi_ioapic_create_irqdomain, NULL);
 		pentry++;
 	}
 
-- 
1.7.10.4

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