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Message-Id: <1415545839-28263-14-git-send-email-jiang.liu@linux.intel.com>
Date: Sun, 9 Nov 2014 23:10:35 +0800
From: Jiang Liu <jiang.liu@...ux.intel.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Randy Dunlap <rdunlap@...radead.org>,
Yinghai Lu <yinghai@...nel.org>,
Borislav Petkov <bp@...en8.de>,
Grant Likely <grant.likely@...aro.org>,
Marc Zyngier <marc.zyngier@....com>,
Yingjoe Chen <yingjoe.chen@...iatek.com>, x86@...nel.org,
Matthias Brugger <matthias.bgg@...il.com>,
Jiang Liu <jiang.liu@...ux.intel.com>,
Yijing Wang <wangyijing@...wei.com>,
Alexander Gordeev <agordeev@...hat.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Tony Luck <tony.luck@...el.com>,
Joerg Roedel <joro@...tes.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [RFC Part4 v1 13/17] MSI: Provide irqdomain support for generic MSI
Enhance generic MSI code to support hierarchy irqdomain.
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
arch/x86/kernel/apic/msi.c | 4 +--
drivers/pci/msi.c | 6 ++--
include/linux/msi.h | 29 ++++++++++++++++--
kernel/irq/msi.c | 70 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 101 insertions(+), 8 deletions(-)
diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index f625c2f21377..9774092012b8 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -116,7 +116,7 @@ void arch_init_msi_domain(struct irq_domain *parent)
if (disable_apic)
return;
- msi_default_domain = msi_create_irq_domain(NULL, &msi_chip, parent);
+ msi_default_domain = pci_msi_create_irq_domain(NULL, &msi_chip, parent);
if (!msi_default_domain)
pr_warn("failed to initialize irqdomain for MSI/MSI-x.\n");
}
@@ -135,7 +135,7 @@ static struct irq_chip msi_ir_chip = {
struct irq_domain *arch_create_msi_irq_domain(struct irq_domain *parent)
{
- return msi_create_irq_domain(NULL, &msi_ir_chip, parent);
+ return pci_msi_create_irq_domain(NULL, &msi_ir_chip, parent);
}
#endif
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 80be534df522..17343cb4d756 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1142,9 +1142,9 @@ static struct irq_domain_ops msi_domain_ops = {
.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 *pci_msi_create_irq_domain(struct device_node *of_node,
+ struct irq_chip *chip,
+ struct irq_domain *parent)
{
struct irq_domain *domain;
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 5639970db71d..43c0a7ae0df7 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -8,6 +8,7 @@ struct irq_data;
struct irq_chip;
struct irq_domain;
struct device_node;
+struct irq_domain;
struct msi_msg {
u32 address_lo; /* low 32 bits of msi message address */
@@ -52,11 +53,33 @@ void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+struct msi_domain_info;
+
+struct msi_domain_ops {
+ 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);
+ int (*msi_init)(struct irq_domain *domain, struct msi_domain_info *info,
+ unsigned int virq, irq_hw_number_t hwirq, void *arg);
+ void (*msi_free)(struct irq_domain *domain,
+ struct msi_domain_info *info, unsigned int virq);
+};
+
+struct msi_domain_info {
+ struct msi_domain_ops *ops;
+ struct irq_chip *chip;
+ void *data;
+};
+
int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
bool force);
void msi_domain_activate(struct irq_domain *domain, struct irq_data *irq_data);
void msi_domain_deactivate(struct irq_domain *domain,
struct irq_data *irq_data);
+struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
+ struct msi_domain_info *info,
+ struct irq_domain *parent);
+struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
#ifdef CONFIG_PCI_MSI
@@ -94,9 +117,9 @@ struct msi_chip {
};
#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
-struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
- struct irq_chip *chip,
- struct irq_domain *parent);
+struct irq_domain *pci_msi_create_irq_domain(struct device_node *of_node,
+ struct irq_chip *chip,
+ struct irq_domain *parent);
void pci_msi_write_msg(struct irq_data *irq_data, struct msi_msg *msg);
int msi_irq_domain_alloc_irqs(struct irq_domain *domain, int type,
struct pci_dev *dev, void *arg);
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 6ae0bd7ee204..85a50254d815 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -58,4 +58,74 @@ void msi_domain_deactivate(struct irq_domain *domain, struct irq_data *irq_data)
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)
+{
+ int i, ret;
+ 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);
+
+ 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)
+{
+ int i;
+ struct msi_domain_info *info = domain->host_data;
+
+ 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,
+};
+
+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)
+ return NULL;
+
+ domain->parent = parent;
+
+ return domain;
+}
+
+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 */
--
1.7.10.4
--
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