From patchwork Fri Sep 11 00:01:06 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jake Oshins X-Patchwork-Id: 516507 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 25539140323 for ; Fri, 11 Sep 2015 10:12:15 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=sendgrid.me header.i=@sendgrid.me header.b=aKam9gsT; dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751018AbbIKAJZ (ORCPT ); Thu, 10 Sep 2015 20:09:25 -0400 Received: from o1.f.az.sendgrid.net ([208.117.55.132]:25303 "EHLO o1.f.az.sendgrid.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751369AbbIKAJT (ORCPT ); Thu, 10 Sep 2015 20:09:19 -0400 X-Greylist: delayed 314 seconds by postgrey-1.27 at vger.kernel.org; Thu, 10 Sep 2015 20:09:13 EDT DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sendgrid.me; h=from:to:cc:subject:in-reply-to:references; s=smtpapi; bh=YIJse5bvX0wJ6ru9Qo5p6y0qCMA=; b=aKam9gsT//puzg5b4ceRU7Xkc2e2R JRhbqgfpxf0FVo7d3rN5Ot53tqAHjfErUtx5Y13wjjFj3MPOPqA5vDgmUVE/ONQu pJ7y1rlJfFK1LOkN7Ni45fo0JF3Bya/rK+ksajIjjEntSbqz/98fjId0+0NJshxL 3X9iFtnEiu0vOk= Received: by filter-177.sjc1.sendgrid.net with SMTP id filter-177.14219.55F21A96A 2015-09-11 00:04:38.807599908 +0000 UTC Received: from jakeoshinsu2.jakeoshinsu2.d1.internal.cloudapp.net (unknown [104.210.40.47]) by ismtpd-046 (SG) with ESMTP id 14fb9b7dc0f.502f.1adba41 Fri, 11 Sep 2015 00:04:38 +0000 (UTC) From: jakeo@microsoft.com To: gregkh@linuxfoundation.org, kys@microsoft.com, linux-kernel@vger.kernel.org, devel@linuxdriverproject.org, olaf@aepfle.de, apw@canonical.com, vkuznets@redhat.com, linux-pci@vger.kernel.org, bhelgaas@google.com, tglx@linutronix.de Cc: Jake Oshins Subject: [PATCH v2 07/12] drivers:x86:pci: Make it possible to implement a PCI MSI IRQ Domain in a module. Date: Fri, 11 Sep 2015 00:01:06 +0000 Message-Id: <1441929670-10058-8-git-send-email-jakeo@microsoft.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1441929670-10058-1-git-send-email-jakeo@microsoft.com> References: <1441929670-10058-1-git-send-email-jakeo@microsoft.com> X-SG-EID: lfnueJVzSjg1mfuVqqukVH7tZvRy9mfCIcBnfbfzaMMWVgeXPdEksBJQKTtitQJWLhj/v5uZfCNlFi MeMQrr89WmtG6b20LT+IHx4y/drNNgDbDr9qC4VMzWEhSkdQYyrO9CU/jXyn+KUSCRLnzKaDNnKTtZ knL3zUdEcH6mvxs= Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Jake Oshins The Linux kernel already has the concept of IRQ domain, wherein a component can expose a set of IRQs which are managed by a particular interrupt controller chip or other subsystem. The PCI driver exposes the notion of an IRQ domain for Message-Signaled Interrupts (MSI) from PCI Express devices. This patch exposes the functions which are necessary for making an MSI IRQ domain within a module. The same goal could be accomplished by building an MSI IRQ domain for Hyper-V into the kernel itself, but this would have required pulling in a lot of other code which currently exists in modules, and it seemed cleaner to avoid that. Signed-off-by: Jake Oshins --- arch/x86/include/asm/msi.h | 4 ++++ arch/x86/kernel/apic/msi.c | 5 +++-- arch/x86/kernel/apic/vector.c | 2 ++ drivers/pci/msi.c | 2 ++ kernel/irq/chip.c | 1 + 5 files changed, 12 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/msi.h b/arch/x86/include/asm/msi.h index 93724cc..e8b7924 100644 --- a/arch/x86/include/asm/msi.h +++ b/arch/x86/include/asm/msi.h @@ -1,7 +1,11 @@ #ifndef _ASM_X86_MSI_H #define _ASM_X86_MSI_H #include +#include typedef struct irq_alloc_info msi_alloc_info_t; +int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec, + msi_alloc_info_t *arg); + #endif /* _ASM_X86_MSI_H */ diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c index 5f1feb6..bdb28fc 100644 --- a/arch/x86/kernel/apic/msi.c +++ b/arch/x86/kernel/apic/msi.c @@ -96,8 +96,8 @@ static irq_hw_number_t pci_msi_get_hwirq(struct msi_domain_info *info, return arg->msi_hwirq; } -static int pci_msi_prepare(struct irq_domain *domain, struct device *dev, - int nvec, msi_alloc_info_t *arg) +int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec, + msi_alloc_info_t *arg) { struct pci_dev *pdev = to_pci_dev(dev); struct msi_desc *desc = first_pci_msi_entry(pdev); @@ -113,6 +113,7 @@ static int pci_msi_prepare(struct irq_domain *domain, struct device *dev, return 0; } +EXPORT_SYMBOL_GPL(pci_msi_prepare); static void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc) { diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c index 1bbd0fe..b16d915 100644 --- a/arch/x86/kernel/apic/vector.c +++ b/arch/x86/kernel/apic/vector.c @@ -29,6 +29,7 @@ struct apic_chip_data { }; struct irq_domain *x86_vector_domain; +EXPORT_SYMBOL_GPL(x86_vector_domain); static DEFINE_RAW_SPINLOCK(vector_lock); static cpumask_var_t vector_cpumask; static struct irq_chip lapic_controller; @@ -66,6 +67,7 @@ struct irq_cfg *irqd_cfg(struct irq_data *irq_data) return data ? &data->cfg : NULL; } +EXPORT_SYMBOL_GPL(irqd_cfg); struct irq_cfg *irq_cfg(unsigned int irq) { diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index c7ad8ce..1aaa26d 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1119,6 +1119,7 @@ struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc) { return to_pci_dev(desc->dev); } +EXPORT_SYMBOL(msi_desc_to_pci_dev); void *msi_desc_to_pci_sysdata(struct msi_desc *desc) { @@ -1274,6 +1275,7 @@ struct irq_domain *pci_msi_create_irq_domain(struct device_node *node, domain->bus_token = DOMAIN_BUS_PCI_MSI; return domain; } +EXPORT_SYMBOL_GPL(pci_msi_create_irq_domain); /** * pci_msi_domain_alloc_irqs - Allocate interrupts for @dev in @domain diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 6e40a95..b0d9ecd 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -935,6 +935,7 @@ void irq_chip_ack_parent(struct irq_data *data) data = data->parent_data; data->chip->irq_ack(data); } +EXPORT_SYMBOL_GPL(irq_chip_ack_parent); /** * irq_chip_mask_parent - Mask the parent interrupt