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genirq: Add generic msi irq domain support
Implement the basic functions for MSI interrupt support with hierarchical interrupt domains. [ tglx: Extracted and combined from several patches ] Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Grant Likely <grant.likely@linaro.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Yingjoe Chen <yingjoe.chen@mediatek.com> Cc: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| /* | ||
| * linux/kernel/irq/msi.c | ||
| * | ||
| * Copyright (C) 2014 Intel Corp. | ||
| * Author: Jiang Liu <jiang.liu@linux.intel.com> | ||
| * | ||
| * This file is licensed under GPLv2. | ||
| * | ||
| * This file contains common code to support Message Signalled Interrupt for | ||
| * PCI compatible and non PCI compatible devices. | ||
| */ | ||
| #include <linux/irq.h> | ||
| #include <linux/irqdomain.h> | ||
| #include <linux/msi.h> | ||
|
|
||
| #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN | ||
| /** | ||
| * msi_domain_set_affinity - Generic affinity setter function for MSI domains | ||
| * @irq_data: The irq data associated to the interrupt | ||
| * @mask: The affinity mask to set | ||
| * @force: Flag to enforce setting (disable online checks) | ||
| * | ||
| * Intended to be used by MSI interrupt controllers which are | ||
| * implemented with hierarchical domains. | ||
| */ | ||
| int msi_domain_set_affinity(struct irq_data *irq_data, | ||
| const struct cpumask *mask, bool force) | ||
| { | ||
| struct irq_data *parent = irq_data->parent_data; | ||
| struct msi_msg msg; | ||
| int ret; | ||
|
|
||
| ret = parent->chip->irq_set_affinity(parent, mask, force); | ||
| if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE) { | ||
| BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg)); | ||
| irq_chip_write_msi_msg(irq_data, &msg); | ||
| } | ||
|
|
||
| return ret; | ||
| } | ||
|
|
||
| static void msi_domain_activate(struct irq_domain *domain, | ||
| struct irq_data *irq_data) | ||
| { | ||
| struct msi_msg msg; | ||
|
|
||
| BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg)); | ||
| irq_chip_write_msi_msg(irq_data, &msg); | ||
| } | ||
|
|
||
| static void msi_domain_deactivate(struct irq_domain *domain, | ||
| struct irq_data *irq_data) | ||
| { | ||
| struct msi_msg msg; | ||
|
|
||
| memset(&msg, 0, sizeof(msg)); | ||
| irq_chip_write_msi_msg(irq_data, &msg); | ||
| } | ||
|
|
||
| static int msi_domain_alloc(struct irq_domain *domain, unsigned int virq, | ||
| unsigned int nr_irqs, void *arg) | ||
| { | ||
| struct msi_domain_info *info = domain->host_data; | ||
| struct msi_domain_ops *ops = info->ops; | ||
| irq_hw_number_t hwirq = ops->get_hwirq(info, arg); | ||
| int i, ret; | ||
|
|
||
| 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++) { | ||
| ret = ops->msi_init(domain, info, virq + i, hwirq + i, arg); | ||
| if (ret < 0) { | ||
| if (ops->msi_free) { | ||
| for (i--; i > 0; i--) | ||
| ops->msi_free(domain, info, virq + i); | ||
| } | ||
| irq_domain_free_irqs_top(domain, virq, nr_irqs); | ||
| return ret; | ||
| } | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static void msi_domain_free(struct irq_domain *domain, unsigned int virq, | ||
| unsigned int nr_irqs) | ||
| { | ||
| struct msi_domain_info *info = domain->host_data; | ||
| int i; | ||
|
|
||
| if (info->ops->msi_free) { | ||
| for (i = 0; i < nr_irqs; i++) | ||
| info->ops->msi_free(domain, info, virq + i); | ||
| } | ||
| irq_domain_free_irqs_top(domain, virq, nr_irqs); | ||
| } | ||
|
|
||
| static struct irq_domain_ops msi_domain_ops = { | ||
| .alloc = msi_domain_alloc, | ||
| .free = msi_domain_free, | ||
| .activate = msi_domain_activate, | ||
| .deactivate = msi_domain_deactivate, | ||
| }; | ||
|
|
||
| /** | ||
| * msi_create_irq_domain - Create a MSI interrupt domain | ||
| * @of_node: Optional device-tree node of the interrupt controller | ||
| * @info: MSI domain info | ||
| * @parent: Parent irq domain | ||
| */ | ||
| struct irq_domain *msi_create_irq_domain(struct device_node *of_node, | ||
| struct msi_domain_info *info, | ||
| struct irq_domain *parent) | ||
| { | ||
| struct irq_domain *domain; | ||
|
|
||
| domain = irq_domain_add_tree(of_node, &msi_domain_ops, info); | ||
| if (domain) | ||
| domain->parent = parent; | ||
|
|
||
| return domain; | ||
| } | ||
|
|
||
| /** | ||
| * msi_get_domain_info - Get the MSI interrupt domain info for @domain | ||
| * @domain: The interrupt domain to retrieve data from | ||
| * | ||
| * Returns the pointer to the msi_domain_info stored in | ||
| * @domain->host_data. | ||
| */ | ||
| struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain) | ||
| { | ||
| return (struct msi_domain_info *)domain->host_data; | ||
| } | ||
|
|
||
| #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */ |