Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752764AbbFLCuf (ORCPT ); Thu, 11 Jun 2015 22:50:35 -0400 Received: from szxga01-in.huawei.com ([58.251.152.64]:18404 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750891AbbFLCu2 (ORCPT ); Thu, 11 Jun 2015 22:50:28 -0400 From: Ma Jun To: , , , , , , , , , Subject: [PATCH v2 2/3] IRQ/Gic-V3: Change arm-gic-its to support the Mbigen interrupt Date: Fri, 12 Jun 2015 10:49:58 +0800 Message-ID: <1434077399-32200-3-git-send-email-majun258@huawei.com> X-Mailer: git-send-email 1.9.5.msysgit.1 In-Reply-To: <1434077399-32200-1-git-send-email-majun258@huawei.com> References: <1434077399-32200-1-git-send-email-majun258@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.177.236.124] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7908 Lines: 265 This patch is applied to support the mbigen interrupt. As a kind of MSI interrupt controller, the mbigen is used as a child domain of ITS domain just like PCI devices. So the arm-gic-v3-its and related files are changed. The chip.c is also changed to check irq_ach before it called. Change log: ---arm-gic-v3-its.c: [1]Create the mbigen irq domain in its_init; [2] add the irq_compose_mbigen_msg and irq_write_mbigen_msg for mbigen using.[3]add its_mbigen_prepare function. ---irq.h: Add 'irq_compose_mbigen_msg' and 'irq_write_mbigen_msg' in struct irq_chip for mbigen using. ---chip.c: Before the irq_ack callback, check the irq_ack first(chip.c) Signed-off-by: Ma Jun --- drivers/irqchip/irq-gic-v3-its.c | 66 +++++++++++++++++++++++++++++++++++++- include/linux/irq.h | 5 +++ kernel/irq/chip.c | 40 ++++++++++++++++++++-- 3 files changed, 106 insertions(+), 5 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 9687f8a..2651f7c 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -61,6 +62,7 @@ struct its_node { raw_spinlock_t lock; struct list_head entry; struct msi_controller msi_chip; + struct mbigen_chip mbi_chip; struct irq_domain *domain; void __iomem *base; unsigned long phys_base; @@ -599,7 +601,21 @@ static void its_irq_compose_msi_msg(struct irq_data *d, struct msi_msg *msg) msg->address_lo = addr & ((1UL << 32) - 1); msg->address_hi = addr >> 32; - msg->data = its_get_event_id(d); + msg->data = its_get_event_id(d); +} + +static void its_irq_compose_mbigen_msg(struct irq_data *d,struct mbigen_msg *msg) +{ + struct its_device *its_dev = irq_data_get_irq_chip_data(d); + struct its_node *its; + u64 addr; + + its = its_dev->its; + addr = its->phys_base + GITS_TRANSLATER; + + msg->address_lo = addr & ((1UL << 32) - 1); + msg->address_hi = addr >> 32; + msg->data = its_get_event_id(d); } static struct irq_chip its_irq_chip = { @@ -609,6 +625,7 @@ static struct irq_chip its_irq_chip = { .irq_eoi = its_eoi_irq, .irq_set_affinity = its_set_affinity, .irq_compose_msi_msg = its_irq_compose_msi_msg, + .irq_compose_mbigen_msg = its_irq_compose_mbigen_msg, }; static void its_mask_msi_irq(struct irq_data *d) @@ -1245,6 +1262,38 @@ static struct msi_domain_info its_pci_msi_domain_info = { .chip = &its_msi_irq_chip, }; +static int its_mbigen_prepare(struct irq_domain *domain, struct mbi_desc *desc, + int hwirq, struct mbi_alloc_info *arg) +{ + struct its_node *its = domain->parent->host_data; + struct its_device *its_dev; + u32 dev_id; + + dev_id = desc->msg_id; + + its_dev = its_find_device(its, dev_id); + if (!its_dev) { + its_dev = its_create_device(its, dev_id, desc->lines); + if (!its_dev) + return -ENOMEM; + } + + arg->scratchpad[0].ptr = its_dev; + arg->scratchpad[1].ptr = NULL; + + arg->desc = desc; + arg->hwirq = hwirq; + return 0; +} + +static struct mbigen_domain_ops its_mbigen_ops = { + .mbigen_prepare = its_mbigen_prepare, +}; + +static struct mbigen_domain_info its_mbigen_domain_info = { + .ops = &its_mbigen_ops, +}; + static int its_irq_gic_domain_alloc(struct irq_domain *domain, unsigned int virq, irq_hw_number_t hwirq) @@ -1489,6 +1538,18 @@ static int its_probe(struct device_node *node, struct irq_domain *parent) err = of_pci_msi_chip_add(&its->msi_chip); if (err) goto out_free_domains; + + if (IS_ENABLED(CONFIG_MBIGEN_IRQ_DOMAIN)) { + its->mbi_chip.domain = its_mbigen_create_irq_domain(node, + &its_mbigen_domain_info, + its->domain); + + if (!its->mbi_chip.domain) { + err = -ENOMEM; + pr_warn_once("ITS:no mbigen chip found\n"); + goto out_free_mbigen; + } + } } spin_lock(&its_lock); @@ -1497,6 +1558,9 @@ static int its_probe(struct device_node *node, struct irq_domain *parent) return 0; +out_free_mbigen: + if (its->mbi_chip.domain) + irq_domain_remove(its->mbi_chip.domain); out_free_domains: if (its->msi_chip.domain) irq_domain_remove(its->msi_chip.domain); diff --git a/include/linux/irq.h b/include/linux/irq.h index 62c6901..874497a 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -30,6 +30,7 @@ struct seq_file; struct module; struct msi_msg; +struct mbigen_msg; enum irqchip_irq_state; /* @@ -363,6 +364,9 @@ struct irq_chip { int (*irq_request_resources)(struct irq_data *data); void (*irq_release_resources)(struct irq_data *data); + void (*irq_compose_mbigen_msg)(struct irq_data *data, struct mbigen_msg *msg); + void (*irq_write_mbigen_msg)(struct irq_data *data, struct mbigen_msg *msg); + void (*irq_compose_msi_msg)(struct irq_data *data, struct msi_msg *msg); void (*irq_write_msi_msg)(struct irq_data *data, struct msi_msg *msg); @@ -457,6 +461,7 @@ extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc); extern void handle_nested_irq(unsigned int irq); extern int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg); +extern int irq_chip_compose_mbigen_msg(struct irq_data *data, struct mbigen_msg *msg); #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY extern void irq_chip_ack_parent(struct irq_data *data); extern int irq_chip_retrigger_hierarchy(struct irq_data *data); diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index eb9a4ea..83104fd 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -12,6 +12,7 @@ #include #include +#include #include #include #include @@ -882,7 +883,8 @@ void irq_cpu_offline(void) void irq_chip_ack_parent(struct irq_data *data) { data = data->parent_data; - data->chip->irq_ack(data); + if (data->chip->irq_ack) + data->chip->irq_ack(data); } /** @@ -892,7 +894,8 @@ void irq_chip_ack_parent(struct irq_data *data) void irq_chip_mask_parent(struct irq_data *data) { data = data->parent_data; - data->chip->irq_mask(data); + if (data->chip->irq_mask) + data->chip->irq_mask(data); } /** @@ -902,7 +905,8 @@ void irq_chip_mask_parent(struct irq_data *data) void irq_chip_unmask_parent(struct irq_data *data) { data = data->parent_data; - data->chip->irq_unmask(data); + if (data->chip->irq_unmask) + data->chip->irq_unmask(data); } /** @@ -912,7 +916,8 @@ void irq_chip_unmask_parent(struct irq_data *data) void irq_chip_eoi_parent(struct irq_data *data) { data = data->parent_data; - data->chip->irq_eoi(data); + if (data->chip->irq_eoi) + data->chip->irq_eoi(data); } /** @@ -991,3 +996,30 @@ int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) return 0; } + +/** + * irq_chip_compose_mbigen_msg - Componse mbigen message for a mbigen irq chip + * @data: Pointer to interrupt specific data + * @msg: Pointer to the mbigen message + * + * For hierarchical domains we find the first chip in the hierarchy + * which implements the irq_compose_mbigen_msg callback. For non + * hierarchical we use the top level chip. + */ + +int irq_chip_compose_mbigen_msg(struct irq_data *data, struct mbigen_msg *msg) +{ + struct irq_data *pos = NULL; + +#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY + for (; data; data = data->parent_data) +#endif + if (data->chip && data->chip->irq_compose_mbigen_msg) + pos = data; + if (!pos) + return -ENOSYS; + + pos->chip->irq_compose_mbigen_msg(pos, msg); + + return 0; +} -- 1.7.1 -- 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/