linux-kernel - [PATCH v2 06/22] PCI/MSI: Introduce weak arch_find_msi

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Date:	Thu, 25 Sep 2014 11:14:16 +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 06/22] PCI/MSI: Introduce weak arch_find_msi_chip() to find MSI chip

Introduce weak arch_find_msi_chip() to find the match msi_chip.
Currently, MSI chip associates pci bus to msi_chip. Because in
ARM platform, there may be more than one MSI controller in system.
Associate pci bus to msi_chip help pci device to find the match
msi_chip and setup MSI/MSI-X irq correctly. But in other platform,
like in x86. we only need one MSI chip, because all device use
the same MSI address/data and irq etc. So it's no need to associate
pci bus to MSI chip, just use a arch function, arch_find_msi_chip()
to return the MSI chip for simplicity. The default weak
arch_find_msi_chip() used in ARM platform, find the MSI chip
by pci bus.

Signed-off-by: Yijing Wang <wangyijing@...wei.com>
---
 drivers/pci/msi.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 5f8f3af..3acbe65 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -29,9 +29,14 @@ static int pci_msi_enable = 1;
 
 /* Arch hooks */
 
+struct msi_chip * __weak arch_find_msi_chip(struct pci_dev *dev)
+{
+	return dev->bus->msi;
+}
+
 int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
 {
-	struct msi_chip *chip = dev->bus->msi;
+	struct msi_chip *chip = arch_find_msi_chip(dev);
 	int err;
 
 	if (!chip || !chip->setup_irq)
-- 
1.7.1

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