linux-kernel - [RFC PATCH 07/20] x86/MSI: Use msi_chip instead of arch func to configure MSI/MSI-X

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Date:	Tue, 12 Aug 2014 15:26:00 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	<linux-kernel@...r.kernel.org>, Xinwei Hu <huxinwei@...wei.com>,
	Wuyun <wuyun.wu@...wei.com>, <linux-pci@...r.kernel.org>,
	Marc Zyngier <marc.zyngier@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	<arnab.basu@...escale.com>, <x86@...nel.org>,
	"Arnd Bergmann" <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	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>,
	Yijing Wang <wangyijing@...wei.com>
Subject: [RFC PATCH 07/20] x86/MSI: Use msi_chip instead of arch func to configure MSI/MSI-X

Introduce a new struct msi_chip apic_msi_chip instead of weak arch
functions to configure MSI/MSI-X in x86.

Signed-off-by: Yijing Wang <wangyijing@...wei.com>
---
 arch/x86/include/asm/pci.h     |    1 +
 arch/x86/kernel/apic/io_apic.c |   20 ++++++++++++++++----
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 0892ea0..878a06d 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -101,6 +101,7 @@ void native_teardown_msi_irq(unsigned int irq);
 void native_restore_msi_irqs(struct pci_dev *dev);
 int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc,
 		  unsigned int irq_base, unsigned int irq_offset);
+extern struct msi_chip *x86_msi_chip;
 #else
 #define native_setup_msi_irqs		NULL
 #define native_teardown_msi_irq		NULL
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 2609dcd..eb8ab7c 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3077,24 +3077,25 @@ int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc,
 	return 0;
 }
 
-int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+int native_setup_msi_irqs(struct device *dev, int nvec, int type)
 {
 	struct msi_desc *msidesc;
 	unsigned int irq;
 	int node, ret;
+	struct pci_dev *pdev = to_pci_dev(dev);
 
 	/* Multiple MSI vectors only supported with interrupt remapping */
 	if (type == PCI_CAP_ID_MSI && nvec > 1)
 		return 1;
 
-	node = dev_to_node(&dev->dev);
+	node = dev_to_node(dev);
 
-	list_for_each_entry(msidesc, &dev->msi_list, list) {
+	list_for_each_entry(msidesc, &pdev->msi_list, list) {
 		irq = irq_alloc_hwirq(node);
 		if (!irq)
 			return -ENOSPC;
 
-		ret = setup_msi_irq(dev, msidesc, irq, 0);
+		ret = setup_msi_irq(pdev, msidesc, irq, 0);
 		if (ret < 0) {
 			irq_free_hwirq(irq);
 			return ret;
@@ -3214,6 +3215,17 @@ int default_setup_hpet_msi(unsigned int irq, unsigned int id)
 }
 #endif
 
+struct msi_chip apic_msi_chip = {
+	.setup_irqs = native_setup_msi_irqs,
+	.teardown_irq = native_teardown_msi_irq,
+};
+
+struct msi_chip *arch_get_match_msi_chip(struct device *dev)
+{
+	return x86_msi_chip;
+}
+
+struct msi_chip *x86_msi_chip = &apic_msi_chip;
 #endif /* CONFIG_PCI_MSI */
 /*
  * Hypertransport interrupt support
-- 
1.7.1

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