linux-kernel - [Patch V3 21/37] x86, ACPI, irq: provide basic irqdomain support

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Date:	Tue, 27 May 2014 16:07:56 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Grant Likely <grant.likely@...aro.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	x86@...nel.org
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org
Subject: [Patch V3 21/37] x86, ACPI, irq: provide basic irqdomain support

Enhance ACPI driver to provide basic irqdomain support for IOAPIC.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 arch/x86/kernel/acpi/boot.c |   20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 9525498e41d5..0632622a3798 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -31,6 +31,7 @@
 #include <linux/module.h>
 #include <linux/dmi.h>
 #include <linux/irq.h>
+#include <linux/irqdomain.h>
 #include <linux/slab.h>
 #include <linux/bootmem.h>
 #include <linux/ioport.h>
@@ -324,6 +325,23 @@ static void  mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
 static int mp_register_gsi(struct device *dev, u32 gsi, int trigger,
 			   int polarity);
 
+static struct irq_domain_ops acpi_irqdomain_ops;
+
+static struct irq_domain *acpi_create_irqdomain(int idx, void *arg)
+{
+	struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(idx);
+
+	/*
+	 * Statically allocate IRQ number for legacy IRQs and all pins on the
+	 * first IOAPIC.
+	 */
+	if (gsi_cfg->gsi_base < NR_IRQS_LEGACY &&
+	    ioapic_dynirq_base < gsi_cfg->gsi_end)
+		ioapic_dynirq_base = gsi_cfg->gsi_end + 1;
+
+	return mp_irqdomain_create(idx, NULL, &acpi_irqdomain_ops);
+}
+
 static int __init
 acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
 {
@@ -338,7 +356,7 @@ acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end)
 
 	mp_register_ioapic(ioapic->id,
 			   ioapic->address, ioapic->global_irq_base,
-			   NULL, NULL);
+			   acpi_create_irqdomain, NULL);
 
 	return 0;
 }
-- 
1.7.10.4

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