linux-kernel - [PATCH 1/2] PCI/MSI: Allow an msi_chip to be associated to an irq domain

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Date:	Sat, 15 Nov 2014 10:49:12 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 1/2] PCI/MSI: Allow an msi_chip 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_chip 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@....com>
---
 drivers/pci/msi.c   | 16 +++++++++++++++-
 include/linux/msi.h |  3 +++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index af66b95..aa3b720 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -84,11 +84,25 @@ int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 	return 0;
 }
 
+static struct irq_domain *pci_msi_get_domain(struct pci_dev *dev)
+{
+	struct irq_domain *domain = NULL;
+
+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+	if (dev->bus->msi)
+		domain = dev->bus->msi->domain;
+#endif
+	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, type, dev);
 
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 8b4a69b..a8d309a 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -89,6 +89,9 @@ struct msi_chip {
 	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_chip *chip, struct pci_dev *dev,
 			 struct msi_desc *desc);
-- 
2.1.0

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