linux-kernel - [PATCH v2 07/22] PCI/MSI: Refactor struct msi

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Message-ID: <1411614872-4009-8-git-send-email-wangyijing@huawei.com>
Date:	Thu, 25 Sep 2014 11:14:17 +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>,
	Yijing Wang <wangyijing@...wei.com>
Subject: [PATCH v2 07/22] PCI/MSI: Refactor struct msi_chip to make it become more common

Now there are a lot of __weak arch functions in MSI code.
These functions make MSI driver complex. Thierry Reding Introduced
a new MSI chip framework to configure MSI/MSI-X irq in ARM. Use
the new MSI chip framework to refactor all other platform MSI
arch code to eliminate weak arch MSI functions. This patch add
.restore_irq() and .setup_irqs() to make it become more common.

Signed-off-by: Yijing Wang <wangyijing@...wei.com>
Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
---
 drivers/pci/msi.c   |   15 +++++++++++++++
 include/linux/msi.h |    3 +++
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 3acbe65..d10edee 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -64,6 +64,11 @@ int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
 	struct msi_desc *entry;
 	int ret;
+	struct msi_chip *chip;
+
+	chip = arch_find_msi_chip(dev);
+	if (chip && chip->setup_irqs)
+		return chip->setup_irqs(dev, nvec, type);
 
 	/*
 	 * If an architecture wants to support multiple MSI, it needs to
@@ -106,6 +111,11 @@ void default_teardown_msi_irqs(struct pci_dev *dev)
 
 void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
 {
+	struct msi_chip *chip = arch_find_msi_chip(dev);
+
+	if (chip && chip->teardown_irqs)
+		return chip->teardown_irqs(dev);
+
 	return default_teardown_msi_irqs(dev);
 }
 
@@ -129,6 +139,11 @@ static void default_restore_msi_irq(struct pci_dev *dev, int irq)
 
 void __weak arch_restore_msi_irqs(struct pci_dev *dev)
 {
+	struct msi_chip *chip = arch_find_msi_chip(dev);
+
+	if (chip && chip->restore_irqs)
+		return chip->restore_irqs(dev);
+
 	return default_restore_msi_irqs(dev);
 }
 
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 6fdc5c6..4cf1f31 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -69,7 +69,10 @@ struct msi_chip {
 	struct list_head list;
 
 	int (*setup_irq)(struct pci_dev *dev, struct msi_desc *desc);
+	int (*setup_irqs)(struct pci_dev *dev, int nvec, int type);
 	void (*teardown_irq)(unsigned int irq);
+	void (*teardown_irqs)(struct pci_dev *dev);
+	void (*restore_irqs)(struct pci_dev *dev);
 };
 
 #endif /* LINUX_MSI_H */
-- 
1.7.1

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