From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753169AbaHMBRe (ORCPT ); Tue, 12 Aug 2014 21:17:34 -0400 Received: from szxga01-in.huawei.com ([119.145.14.64]:63983 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752129AbaHMBRb (ORCPT ); Tue, 12 Aug 2014 21:17:31 -0400 Message-ID: <53EABC7E.6080103@huawei.com> Date: Wed, 13 Aug 2014 09:16:46 +0800 From: Yijing Wang User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Thunderbird/24.0.1 MIME-Version: 1.0 To: Konrad Rzeszutek Wilk CC: Bjorn Helgaas , , Xinwei Hu , Wuyun , , Marc Zyngier , , Russell King , , , "Arnd Bergmann" , Thomas Gleixner , "H. Peter Anvin" , , Joerg Roedel , , , Benjamin Herrenschmidt , , , Sebastian Ott , "Tony Luck" , , "David S. Miller" , , Chris Metcalf Subject: Re: [RFC PATCH 07/20] x86/MSI: Use msi_chip instead of arch func to configure MSI/MSI-X References: <1407828373-24322-1-git-send-email-wangyijing@huawei.com> <1407828373-24322-8-git-send-email-wangyijing@huawei.com> <20140812190947.GD13996@laptop.dumpdata.com> In-Reply-To: <20140812190947.GD13996@laptop.dumpdata.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.177.27.212] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2014/8/13 3:09, Konrad Rzeszutek Wilk wrote: > On Tue, Aug 12, 2014 at 03:26:00PM +0800, Yijing Wang wrote: >> Introduce a new struct msi_chip apic_msi_chip instead of weak arch >> functions to configure MSI/MSI-X in x86. > > Why not 'x86_msi_ops' (see arch/x86/kernel/x86_init.c) Hi Konrad, I think currently lots of weak arch functions make MSI code complex, we have following weak arch functions arch_setup_msi_irqs arch_setup_msi_irq arch_msi_check_device arch_teardown_msi_irqs arch_teardown_msi_irq arch_restore_msi_irqs arch_msi_mask_irq arch_msix_mask_irq And Thierry Reding and Thomas Petazzoni introduce a new MSI chip infrastructure which is used in arm platform now. Use msi_chip let us focus on implementing msi_chip ops functions(no need to implement all), but now, we should know much of MSI enable flow, then override the weak functions. I think use the unified MSI framework in all platforms is better. Also this series is preparation to support Non-PCI MSI device use common MSI framework in linux. Non-PCI MSI devices include hpet, dmar and the coming consolidator(introduced in ARM GICv3 spec, which is similar to MSI relay device). Thanks! Yijing. >> >> Signed-off-by: Yijing Wang >> --- >> 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 >> > > . > -- Thanks! Yijing