linux-kernel - [PATCH v3 24/27] IA64/MSI: Use MSI chip framework to configure MSI/MSI-X irq

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Date:	Wed, 15 Oct 2014 11:07:12 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	<linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Xinwei Hu <huxinwei@...wei.com>, Wuyun <wuyun.wu@...wei.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	<linux-arch@...r.kernel.org>, <arnab.basu@...escale.com>,
	<Bharat.Bhushan@...escale.com>, <x86@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
	<xen-devel@...ts.xenproject.org>, Joerg Roedel <joro@...tes.org>,
	<iommu@...ts.linux-foundation.org>, <linux-mips@...ux-mips.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-s390@...r.kernel.org>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	"Tony Luck" <tony.luck@...el.com>, <linux-ia64@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	<sparclinux@...r.kernel.org>, Chris Metcalf <cmetcalf@...era.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Lucas Stach <l.stach@...gutronix.de>,
	David Vrabel <david.vrabel@...rix.com>,
	"Sergei Shtylyov" <sergei.shtylyov@...entembedded.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Thierry Reding <thierry.reding@...il.com>,
	"Thomas Petazzoni" <thomas.petazzoni@...e-electrons.com>,
	Liviu Dudau <liviu@...au.co.uk>,
	Yijing Wang <wangyijing@...wei.com>
Subject: [PATCH v3 24/27] IA64/MSI: Use MSI chip framework to configure MSI/MSI-X irq

Use MSI chip framework instead of arch MSI functions to configure
MSI/MSI-X irq. So we can manage MSI/MSI-X irq in a unified framework.

Signed-off-by: Yijing Wang <wangyijing@...wei.com>
---
 arch/ia64/include/asm/pci.h |   10 ++++++++++
 arch/ia64/kernel/msi_ia64.c |   14 ++++++++++----
 arch/ia64/pci/pci.c         |    1 +
 3 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/arch/ia64/include/asm/pci.h b/arch/ia64/include/asm/pci.h
index 52af5ed..907dcba 100644
--- a/arch/ia64/include/asm/pci.h
+++ b/arch/ia64/include/asm/pci.h
@@ -94,6 +94,7 @@ struct pci_controller {
 	int segment;
 	int node;		/* nearest node with memory or NUMA_NO_NODE for global allocation */
 
+	struct msi_chip *msi_chip;
 	void *platform_data;
 };
 
@@ -101,6 +102,15 @@ struct pci_controller {
 #define PCI_CONTROLLER(busdev) ((struct pci_controller *) busdev->sysdata)
 #define pci_domain_nr(busdev)    (PCI_CONTROLLER(busdev)->segment)
 
+extern struct msi_chip chip;
+
+static inline struct msi_chip *pci_msi_chip(struct pci_bus *bus)
+{
+	struct pci_controller *ctrl = bus->sysdata;
+
+	return ctrl->msi_chip;
+}
+
 extern struct pci_ops pci_root_ops;
 
 static inline int pci_proc_domain(struct pci_bus *bus)
diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
index 8c3730c..401fc98 100644
--- a/arch/ia64/kernel/msi_ia64.c
+++ b/arch/ia64/kernel/msi_ia64.c
@@ -112,15 +112,16 @@ static struct irq_chip ia64_msi_chip = {
 };
 
 
-int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
+static int arch_ia64_setup_msi_irq(struct msi_chip *chip,
+		struct pci_dev *dev, struct msi_desc *desc)
 {
 	if (platform_setup_msi_irq)
-		return platform_setup_msi_irq(pdev, desc);
+		return platform_setup_msi_irq(dev, desc);
 
-	return ia64_setup_msi_irq(pdev, desc);
+	return ia64_setup_msi_irq(dev, desc);
 }
 
-void arch_teardown_msi_irq(unsigned int irq)
+static void arch_ia64_teardown_msi_irq(struct msi_chip *chip, unsigned int irq)
 {
 	if (platform_teardown_msi_irq)
 		return platform_teardown_msi_irq(irq);
@@ -128,6 +129,11 @@ void arch_teardown_msi_irq(unsigned int irq)
 	return ia64_teardown_msi_irq(irq);
 }
 
+struct msi_chip chip = {
+	.setup_irq = arch_ia64_setup_msi_irq,
+	.teardown_irq = arch_ia64_teardown_msi_irq,
+};
+
 #ifdef CONFIG_INTEL_IOMMU
 #ifdef CONFIG_SMP
 static int dmar_msi_set_affinity(struct irq_data *data,
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 291a582..299b67d 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -437,6 +437,7 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 
 	controller->companion = device;
 	controller->node = acpi_get_node(device->handle);
+	controller->msi_chip = &chip;
 
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
 	if (!info) {
-- 
1.7.1

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