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authorMarc Zyngier <marc.zyngier@arm.com>2014-11-15 10:49:12 +0000
committerThomas Gleixner <tglx@linutronix.de>2014-11-23 17:14:43 +0100
commit020c312658d61297ffe43b412441c69b1c36fb1b (patch)
tree78a5a66c070bbf4790e5a192f63ab8813e11e9e4
parent8e047adae969701c6cec136484bb9de8572af934 (diff)
PCI/MSI: Allow an msi_controller to be associated to an irq domain
With the new stacked irq domains, it becomes pretty tempting to allocate an MSI domain per PCI bus, which would remove the requirement of either relying on arch-specific code, or a default PCI MSI domain. By allowing the msi_controller structure to carry a pointer to an irq_domain, we can easily use this in pci_msi_setup_msi_irqs. The existing code can still be used as a fallback if the MSI driver does not populate the domain field. Tested on arm64 with the GICv3 ITS driver. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Cc: Yingjoe Chen <yingjoe.chen@mediatek.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: linux-arm-kernel@lists.infradead.org Cc: Jiang Liu <jiang.liu@linux.intel.com> Link: http://lkml.kernel.org/r/1416048553-29289-2-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--drivers/pci/msi.c16
-rw-r--r--include/linux/msi.h3
2 files changed, 17 insertions, 2 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 4befe09053c1..476f4b1a2727 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -37,11 +37,23 @@ struct irq_domain * __weak arch_get_pci_msi_domain(struct pci_dev *dev)
return pci_msi_default_domain;
}
+static struct irq_domain *pci_msi_get_domain(struct pci_dev *dev)
+{
+ struct irq_domain *domain = NULL;
+
+ if (dev->bus->msi)
+ domain = dev->bus->msi->domain;
+ if (!domain)
+ domain = arch_get_pci_msi_domain(dev);
+
+ return domain;
+}
+
static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
struct irq_domain *domain;
- domain = arch_get_pci_msi_domain(dev);
+ domain = pci_msi_get_domain(dev);
if (domain)
return pci_msi_domain_alloc_irqs(domain, dev, nvec, type);
@@ -52,7 +64,7 @@ static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
{
struct irq_domain *domain;
- domain = arch_get_pci_msi_domain(dev);
+ domain = pci_msi_get_domain(dev);
if (domain)
pci_msi_domain_free_irqs(domain, dev);
else
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 692f217ae813..8ac4a68ffae2 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -108,6 +108,9 @@ struct msi_controller {
struct device *dev;
struct device_node *of_node;
struct list_head list;
+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+ struct irq_domain *domain;
+#endif
int (*setup_irq)(struct msi_controller *chip, struct pci_dev *dev,
struct msi_desc *desc);