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PCI/MSI: Allow an msi_controller to be associated to an irq domain

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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>
This commit is contained in:
Marc Zyngier 2014-11-15 10:49:12 +00:00 committed by Thomas Gleixner
parent 8e047adae9
commit 020c312658
2 changed files with 17 additions and 2 deletions
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16
drivers/pci/msi.c
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@ -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

3
include/linux/msi.h
View File

@ -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);