Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752491AbaKFOZo (ORCPT ); Thu, 6 Nov 2014 09:25:44 -0500 Received: from mga01.intel.com ([192.55.52.88]:22808 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751828AbaKFOZk (ORCPT ); Thu, 6 Nov 2014 09:25:40 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,326,1413270000"; d="scan'208";a="618223613" From: Jiang Liu To: Benjamin Herrenschmidt , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , "Rafael J. Wysocki" , Bjorn Helgaas , Randy Dunlap , Yinghai Lu , Borislav Petkov , Grant Likely , Marc Zyngier , Yingjoe Chen , Matthias Brugger , Yijing Wang , Jiang Liu , Alexander Gordeev Cc: Konrad Rzeszutek Wilk , Andrew Morton , Tony Luck , Joerg Roedel , Greg Kroah-Hartman , x86@kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [Patch Part2 v5 21/31] PCI/MSI: Enhance core to support hierarchy irqdomain Date: Thu, 6 Nov 2014 22:20:34 +0800 Message-Id: <1415283644-2559-22-git-send-email-jiang.liu@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1415283644-2559-1-git-send-email-jiang.liu@linux.intel.com> References: <1415283644-2559-1-git-send-email-jiang.liu@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Enhance PCI MSI core to support hierarchy irqdomain, so the common code could be shared among architectures. Signed-off-by: Jiang Liu --- Hi Thomas, These changes are a temporary solution, I'm working on another patch set which will refine these interfaces, especially kill arch_msi_irq_domain_{set|get}_hwirq(). Regards! Gerry --- drivers/pci/Kconfig | 4 ++ drivers/pci/msi.c | 134 +++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/msi.h | 14 ++++++ 3 files changed, 152 insertions(+) diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index b9db0f2ce11f..022e89745f86 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -16,6 +16,10 @@ config PCI_MSI If you don't know what to do here, say Y. +config PCI_MSI_IRQ_DOMAIN + bool + depends on PCI_MSI && IRQ_DOMAIN_HIERARCHY + config PCI_DEBUG bool "PCI Debugging" depends on PCI && DEBUG_KERNEL diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index da181c59394b..8de7c8774fd2 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -19,6 +19,7 @@ #include #include #include +#include #include "pci.h" @@ -1098,3 +1099,136 @@ int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, return nvec; } EXPORT_SYMBOL(pci_enable_msix_range); + +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN +/* + * Generate a unique ID number for each possible MSI source, the ID number + * is only used within the irqdomain. + */ +static inline irq_hw_number_t +msi_get_hwirq(struct pci_dev *dev, struct msi_desc *desc) +{ + return (irq_hw_number_t)desc->msi_attrib.entry_nr | + PCI_DEVID(dev->bus->number, dev->devfn) << 11 | + (pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 27; +} + +static int msi_domain_alloc(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs, void *arg) +{ + int i, ret; + irq_hw_number_t hwirq = arch_msi_irq_domain_get_hwirq(arg); + + if (irq_find_mapping(domain, hwirq) > 0) + return -EEXIST; + + ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg); + if (ret < 0) + return ret; + + for (i = 0; i < nr_irqs; i++) { + irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i, + domain->host_data, + (void *)(long)i); + __irq_set_handler(virq + i, handle_edge_irq, 0, "edge"); + } + + return ret; +} + +static void msi_domain_free(struct irq_domain *domain, unsigned int virq, + unsigned int nr_irqs) +{ + int i; + + for (i = 0; i < nr_irqs; i++) { + struct msi_desc *desc = irq_get_msi_desc(virq); + + if (desc) + desc->irq = 0; + } + irq_domain_free_irqs_top(domain, virq, nr_irqs); +} + +static void msi_domain_activate(struct irq_domain *domain, + struct irq_data *irq_data) +{ + struct msi_msg msg; + + /* + * irq_data->chip_data is MSI/MSI-X offset. + * MSI-X message is written per-IRQ, the offset is always 0. + * MSI message denotes a contiguous group of IRQs, written for 0th IRQ. + */ + if (irq_data->chip_data) + return; + + BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg)); + __write_msi_msg(irq_data->msi_desc, &msg); +} + +static void msi_domain_deactivate(struct irq_domain *domain, + struct irq_data *irq_data) +{ + struct msi_msg msg; + + if (!irq_data->chip_data) { + memset(&msg, 0, sizeof(msg)); + __write_msi_msg(irq_data->msi_desc, &msg); + } +} + +static struct irq_domain_ops msi_domain_ops = { + .alloc = msi_domain_alloc, + .free = msi_domain_free, + .activate = msi_domain_activate, + .deactivate = msi_domain_deactivate, +}; + +struct irq_domain *msi_create_irq_domain(struct device_node *of_node, + struct irq_chip *chip, + struct irq_domain *parent) +{ + struct irq_domain *domain; + + domain = irq_domain_add_tree(of_node, &msi_domain_ops, chip); + if (!domain) + return NULL; + + domain->parent = parent; + + return domain; +} + +int msi_irq_domain_alloc_irqs(struct irq_domain *domain, int type, + struct pci_dev *dev, void *arg) +{ + int i, virq; + struct msi_desc *desc; + int node = dev_to_node(&dev->dev); + + list_for_each_entry(desc, &dev->msi_list, list) { + arch_msi_irq_domain_set_hwirq(arg, msi_get_hwirq(dev, desc)); + virq = irq_domain_alloc_irqs(domain, desc->nvec_used, + node, arg); + if (virq < 0) { + /* Special handling for pci_enable_msi_range(). */ + if (type == PCI_CAP_ID_MSI && desc->nvec_used > 1) + return 1; + else + return -ENOSPC; + } + for (i = 0; i < desc->nvec_used; i++) + irq_set_msi_desc_off(virq, i, desc); + } + + list_for_each_entry(desc, &dev->msi_list, list) + if (desc->nvec_used == 1) + dev_dbg(&dev->dev, "irq %d for MSI/MSI-X\n", virq); + else + dev_dbg(&dev->dev, "irq [%d-%d] for MSI/MSI-X\n", + virq, virq + desc->nvec_used - 1); + + return 0; +} +#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */ diff --git a/include/linux/msi.h b/include/linux/msi.h index 44f4746d033b..662c628fc2fa 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -75,4 +75,18 @@ struct msi_chip { void (*teardown_irq)(struct msi_chip *chip, unsigned int irq); }; +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN +struct irq_domain; +struct irq_chip; + +struct irq_domain *msi_create_irq_domain(struct device_node *of_node, + struct irq_chip *chip, + struct irq_domain *parent); +int msi_irq_domain_alloc_irqs(struct irq_domain *domain, int type, + struct pci_dev *dev, void *arg); + +irq_hw_number_t arch_msi_irq_domain_get_hwirq(void *arg); +void arch_msi_irq_domain_set_hwirq(void *arg, irq_hw_number_t hwirq); +#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */ + #endif /* LINUX_MSI_H */ -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/