From patchwork Thu Oct 15 15:39:27 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 7407161 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 0C8C0BEEA4 for ; Thu, 15 Oct 2015 15:40:59 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 023AE20515 for ; Thu, 15 Oct 2015 15:40:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D04CC20458 for ; Thu, 15 Oct 2015 15:40:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753455AbbJOPkT (ORCPT ); Thu, 15 Oct 2015 11:40:19 -0400 Received: from foss.arm.com ([217.140.101.70]:36759 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753561AbbJOPjm (ORCPT ); Thu, 15 Oct 2015 11:39:42 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 71D465B1; Thu, 15 Oct 2015 08:39:39 -0700 (PDT) Received: from approximate.cambridge.arm.com (approximate.cambridge.arm.com [10.1.209.125]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 206B63F49B; Thu, 15 Oct 2015 08:39:40 -0700 (PDT) From: Marc Zyngier To: Thomas Gleixner , Jiang Liu , Jason Cooper Cc: Ma Jun , , , Subject: [PATCH RFC 6/7] platform-msi: Allow creation of a MSI-based stacked irq domain Date: Thu, 15 Oct 2015 16:39:27 +0100 Message-Id: <1444923568-17413-7-git-send-email-marc.zyngier@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1444923568-17413-1-git-send-email-marc.zyngier@arm.com> References: <1444923568-17413-1-git-send-email-marc.zyngier@arm.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We almost have all the needed bits to be able to create a irq domain on top of a MSI domain. For this, we enable a few things: - the virq is stored in the msi_desc - device, msi_alloc_info and domain-specific data are stored in the platform_pric_data structure - we introduce a new API for platform-msi: /* Create a MSI-based domain */ struct irq_domain * platform_msi_create_device_domain(struct device *dev, unsigned int nvec, irq_write_msi_msg_t write_msi_msg, const struct irq_domain_ops *ops, void *host_data); /* Allocate MSIs in an MSI domain */ int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs); /* Obtain the host data passed to platform_msi_create_device_domain */ void *platform_msi_get_host_data(struct irq_domain *domain); This now allows a wired irq to MSI bridge to be created. Signed-off-by: Marc Zyngier --- drivers/base/platform-msi.c | 71 +++++++++++++++++++++++++++++++++++++++++++-- include/linux/msi.h | 10 +++++++ 2 files changed, 79 insertions(+), 2 deletions(-) diff --git a/drivers/base/platform-msi.c b/drivers/base/platform-msi.c index 92666cd..29e9b63 100644 --- a/drivers/base/platform-msi.c +++ b/drivers/base/platform-msi.c @@ -32,6 +32,9 @@ * and the callback to write the MSI message. */ struct platform_msi_priv_data { + struct device *dev; + void *host_data; + msi_alloc_info_t arg; irq_write_msi_msg_t write_msg; int devid; }; @@ -124,8 +127,9 @@ static void platform_msi_free_descs(struct device *dev, int base, int nvec) } } -static int platform_msi_alloc_descs(struct device *dev, int nvec, - struct platform_msi_priv_data *data) +static int platform_msi_alloc_descs_with_irq(struct device *dev, int virq, + int nvec, + struct platform_msi_priv_data *data) { struct msi_desc *desc; @@ -145,6 +149,7 @@ static int platform_msi_alloc_descs(struct device *dev, int nvec, desc->platform.msi_priv_data = data; desc->platform.msi_index = base + i; desc->nvec_used = 1; + desc->irq = virq ? virq + i : 0; list_add_tail(&desc->list, dev_to_msi_list(dev)); } @@ -159,6 +164,13 @@ static int platform_msi_alloc_descs(struct device *dev, int nvec, return 0; } +static int platform_msi_alloc_descs(struct device *dev, int nvec, + struct platform_msi_priv_data *data) + +{ + return platform_msi_alloc_descs_with_irq(dev, 0, nvec, data); +} + /** * platform_msi_create_irq_domain - Create a platform MSI interrupt domain * @fwnode: Optional fwnode of the interrupt controller @@ -225,6 +237,7 @@ static int platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec, } datap->write_msg = write_msi_msg; + datap->dev = dev; return 0; } @@ -288,3 +301,57 @@ void platform_msi_domain_free_irqs(struct device *dev) msi_domain_free_irqs(dev->msi_domain, dev); platform_msi_free_descs(dev, 0, MAX_DEV_MSIS); } + +void *platform_msi_get_host_data(struct irq_domain *domain) +{ + struct platform_msi_priv_data *data = domain->host_data; + return data->host_data; +} + +struct irq_domain * +platform_msi_create_device_domain(struct device *dev, + unsigned int nvec, + irq_write_msi_msg_t write_msi_msg, + const struct irq_domain_ops *ops, + void *host_data) +{ + struct platform_msi_priv_data *data; + struct irq_domain *domain; + int err; + + err = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg, &data); + if (err) + return NULL; + + data->host_data = host_data; + domain = irq_domain_create_hierarchy(dev->msi_domain, 0, nvec, + of_node_to_fwnode(dev->of_node), + ops, data); + if (!domain) { + platform_msi_free_priv_data(data); + return NULL; + } + + /* FIXME: Add better error handling... */ + err = msi_domain_prepare_irqs(domain->parent, dev, nvec, &data->arg); + BUG_ON(err); + + return domain; +} + +int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs) +{ + struct platform_msi_priv_data *data = domain->host_data; + int err; + + err = platform_msi_alloc_descs_with_irq(data->dev, virq, nr_irqs, data); + if (err) + return err; + + err = msi_domain_populate_irqs(domain->parent, data->dev, + virq, nr_irqs, &data->arg); + /* FIXME: memory leak on error */ + return err; +} + diff --git a/include/linux/msi.h b/include/linux/msi.h index e35558c..594b2113 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -172,6 +172,7 @@ struct msi_controller { #include struct irq_domain; +struct irq_domain_ops; struct irq_chip; struct device_node; struct fwnode_handle; @@ -283,6 +284,15 @@ int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev, int nvec, msi_alloc_info_t *args); int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev, int virq, int nvec, msi_alloc_info_t *args); +struct irq_domain * +platform_msi_create_device_domain(struct device *dev, + unsigned int nvec, + irq_write_msi_msg_t write_msi_msg, + const struct irq_domain_ops *ops, + void *host_data); +int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs); +void *platform_msi_get_host_data(struct irq_domain *domain); #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */ #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN