linux-kernel - [Patch Part1 v7 07/38] x86/dmar: Use new irqdomain interfaces to allocate/free IRQ

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Date:	Tue, 20 Jan 2015 11:08:10 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Dimitri Sivanich <sivanich@....com>, x86@...nel.org,
	Joerg Roedel <joro@...tes.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	David Cohen <david.a.cohen@...ux.intel.com>,
	Sander Eikelenboom <linux@...elenboom.it>,
	David Vrabel <david.vrabel@...rix.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, iommu@...ts.linux-foundation.org,
	Joerg Roedel <jroedel@...e.de>
Subject: [Patch Part1 v7 07/38] x86/dmar: Use new irqdomain interfaces to allocate/free IRQ

Use new irqdomain interfaces to allocate/free IRQ for DMAR and interrupt
remapping, so we could kill GENERIC_IRQ_LEGACY_ALLOC_HWIRQ later.

The private definition of irq_alloc_hwirqs()/irq_free_hwirqs() are
temporary solution, it will be removed once we have converted interrupt
remapping driver to use irqdomain framework.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: iommu@...ts.linux-foundation.org
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Rafael J. Wysocki <rjw@...ysocki.net>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Joerg Roedel <joro@...tes.org>
Link: http://lkml.kernel.org/r/1416894816-23245-8-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/irq_remapping.h |    4 ++--
 arch/x86/kernel/apic/msi.c           |   10 ++++++++++
 drivers/iommu/irq_remapping.c        |   17 +++++++++++++++--
 3 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index 6224d316c405..86d897bc15dd 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -99,7 +99,7 @@ static inline bool setup_remapped_irq(int irq,
 }
 #endif /* CONFIG_IRQ_REMAP */
 
-#define dmar_alloc_hwirq()	irq_alloc_hwirq(-1)
-#define dmar_free_hwirq		irq_free_hwirq
+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 76cc2c902176..9be7d6d8a579 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -223,6 +223,16 @@ int arch_setup_dmar_msi(unsigned int irq)
 				      "edge");
 	return 0;
 }
+
+int dmar_alloc_hwirq(void)
+{
+	return irq_domain_alloc_irqs(NULL, 1, NUMA_NO_NODE, NULL);
+}
+
+void dmar_free_hwirq(int irq)
+{
+	irq_domain_free_irqs(irq, 1);
+}
 #endif
 
 /*
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 390079ee1350..5617150fd8fb 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -6,6 +6,7 @@
 #include <linux/msi.h>
 #include <linux/irq.h>
 #include <linux/pci.h>
+#include <linux/irqdomain.h>
 
 #include <asm/hw_irq.h>
 #include <asm/irq_remapping.h>
@@ -49,6 +50,18 @@ static void irq_remapping_disable_io_apic(void)
 		disconnect_bsp_APIC(0);
 }
 
+#ifndef CONFIG_GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
+static unsigned int irq_alloc_hwirqs(int cnt, int node)
+{
+	return irq_domain_alloc_irqs(NULL, -1, cnt, node, NULL);
+}
+
+static void irq_free_hwirqs(unsigned int from, int cnt)
+{
+	irq_domain_free_irqs(from, cnt);
+}
+#endif
+
 static int do_setup_msi_irqs(struct pci_dev *dev, int nvec)
 {
 	int ret, sub_handle, nvec_pow2, index = 0;
@@ -104,7 +117,7 @@ static int do_setup_msix_irqs(struct pci_dev *dev, int nvec)
 
 	list_for_each_entry(msidesc, &dev->msi_list, list) {
 
-		irq = irq_alloc_hwirq(node);
+		irq = irq_alloc_hwirqs(1, node);
 		if (irq == 0)
 			return -1;
 
@@ -127,7 +140,7 @@ static int do_setup_msix_irqs(struct pci_dev *dev, int nvec)
 	return 0;
 
 error:
-	irq_free_hwirq(irq);
+	irq_free_hwirqs(irq, 1);
 	return ret;
 }
 
-- 
1.7.10.4

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