Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932774AbaKMLlK (ORCPT ); Thu, 13 Nov 2014 06:41:10 -0500 Received: from mga03.intel.com ([134.134.136.65]:38746 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932729AbaKMLlG (ORCPT ); Thu, 13 Nov 2014 06:41:06 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,376,1413270000"; d="scan'208";a="607188304" From: Jiang Liu To: Bjorn Helgaas , Thomas Gleixner , Ingo Molnar , Grant Likely , Marc Zyngier , Yijing Wang , Yingjoe Chen , Borislav Petkov , "H. Peter Anvin" , Matthias Brugger , Jiang Liu , Alexander Gordeev Cc: Tony Luck , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [Patch V1 3/6] genirq: Introduce msi_irq_domain_{alloc|free}_irqs() Date: Thu, 13 Nov 2014 19:43:46 +0800 Message-Id: <1415879029-20098-5-git-send-email-jiang.liu@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1415879029-20098-1-git-send-email-jiang.liu@linux.intel.com> References: <1415879029-20098-1-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 Introduce msi_irq_domain_{alloc|free}_irqs() to alloc/free interrupts from irqdomain for generic MSI interrupts. Signed-off-by: Jiang Liu --- include/linux/msi.h | 35 ++++++++++++++++++++++++++++++ kernel/irq/msi.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 94 insertions(+) diff --git a/include/linux/msi.h b/include/linux/msi.h index 714716a3ffdd..6b356a1410b2 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -3,6 +3,7 @@ #include #include +#include /* for msi_alloc_info_t */ struct msi_msg { u32 address_lo; /* low 32 bits of msi message address */ @@ -100,7 +101,26 @@ struct irq_chip; struct device_node; struct msi_domain_info; +#ifndef NUM_MSI_ALLOC_SCRATCHPAD_REGS +#define NUM_MSI_ALLOC_SCRATCHPAD_REGS 2 +#endif + +/* + * Default structure for MSI interrupt allocation. + * Arch may overwrite it by define msi_alloc_info_t. + */ +struct msi_alloc_info { + struct msi_desc *desc; + irq_hw_number_t hwirq; + long scratchpad[NUM_MSI_ALLOC_SCRATCHPAD_REGS]; +}; + +#ifndef msi_alloc_info_t +typedef struct msi_alloc_info msi_alloc_info_t; +#endif + struct msi_domain_ops { + /* Callbacks for msi_create_irq_domain() */ void (*calc_hwirq)(struct msi_domain_info *info, void *arg, struct msi_desc *desc); irq_hw_number_t (*get_hwirq)(struct msi_domain_info *info, void *arg); @@ -111,6 +131,19 @@ struct msi_domain_ops { void (*msi_free)(struct irq_domain *domain, struct msi_domain_info *info, unsigned int virq); + + /* Callbacks for msi_irq_domain_alloc_irqs() based on msi_descs */ + int (*msi_check)(struct irq_domain *domain, + struct msi_domain_info *info, + struct device *dev); + int (*msi_prepare)(struct irq_domain *domain, + struct device *dev, + msi_alloc_info_t *arg); + void (*msi_finish)(msi_alloc_info_t *arg, int retval); + void (*set_desc)(msi_alloc_info_t *arg, + struct msi_desc *desc); + int (*handle_error)(struct irq_domain *domain, + struct msi_desc *desc, int error); }; struct msi_domain_info { @@ -125,6 +158,8 @@ int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask, struct irq_domain *msi_create_irq_domain(struct device_node *of_node, struct msi_domain_info *info, struct irq_domain *parent); +int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev); +void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev); struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain); #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */ diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 94d6d87ee23e..0b6665de3a60 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -13,6 +13,9 @@ #include #include +/* Temparory solution for building, will be removed later */ +#include + void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg) { *msg = entry->msg; @@ -124,6 +127,62 @@ struct irq_domain *msi_create_irq_domain(struct device_node *of_node, return domain; } +int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev) +{ + int i, ret, virq = -1; + msi_alloc_info_t arg; + struct msi_desc *desc; + struct msi_domain_info *info = domain->host_data; + struct msi_domain_ops *ops = info->ops; + + ret = ops->msi_check(domain, info, dev); + if (ret == 0) + ret = ops->msi_prepare(domain, dev, &arg); + if (ret) + return ret; + + for_each_msi_entry(desc, dev) { + ops->set_desc(&arg, desc); + + virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used, + dev_to_node(dev), &arg, false); + if (virq < 0) { + ret = -ENOSPC; + if (ops->handle_error) + ret = ops->handle_error(domain, desc, ret); + if (ops->msi_finish) + ops->msi_finish(&arg, ret); + return ret; + } + + for (i = 0; i < desc->nvec_used; i++) + irq_set_msi_desc_off(virq, i, desc); + } + + if (ops->msi_finish) + ops->msi_finish(&arg, 0); + + for_each_msi_entry(desc, dev) { + if (desc->nvec_used == 1) + dev_dbg(dev, "irq %d for MSI\n", virq); + else + dev_dbg(dev, "irq [%d-%d] for MSI\n", + virq, virq + desc->nvec_used - 1); + } + + return 0; +} + +void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev) +{ + struct msi_desc *desc; + + for_each_msi_entry(desc, dev) { + irq_domain_free_irqs(desc->irq, desc->nvec_used); + desc->irq = 0; + } +} + struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain) { return (struct msi_domain_info *)domain->host_data; -- 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/