From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [119.145.14.66]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 9E9741A090C for ; Thu, 25 Sep 2014 12:50:58 +1000 (EST) From: Yijing Wang To: Bjorn Helgaas Subject: [PATCH v2 06/22] PCI/MSI: Introduce weak arch_find_msi_chip() to find MSI chip Date: Thu, 25 Sep 2014 11:14:16 +0800 Message-ID: <1411614872-4009-7-git-send-email-wangyijing@huawei.com> In-Reply-To: <1411614872-4009-1-git-send-email-wangyijing@huawei.com> References: <1411614872-4009-1-git-send-email-wangyijing@huawei.com> MIME-Version: 1.0 Content-Type: text/plain Cc: linux-mips@linux-mips.org, linux-ia64@vger.kernel.org, linux-pci@vger.kernel.org, Bharat.Bhushan@freescale.com, Yijing Wang , Thierry Reding , sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Russell King , Joerg Roedel , x86@kernel.org, Sebastian Ott , xen-devel@lists.xenproject.org, arnab.basu@freescale.com, Arnd Bergmann , Konrad Rzeszutek Wilk , Chris Metcalf , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Thomas Petazzoni , Xinwei Hu , Tony Luck , Sergei Shtylyov , linux-kernel@vger.kernel.org, Ralf Baechle , iommu@lists.linux-foundation.org, David Vrabel , Wuyun , linuxppc-dev@lists.ozlabs.org, "David S. Miller" , Lucas Stach List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 --- 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