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Subject[RFC PATCH 1/2] x86: PCI bus specific MSI operations
Date
This patch adds struct x86_msi_ops to x86's PCI sysdata. This gives a
host bridge driver the option to provide alternate MSI Data Register
and MSI-X Table Entry programming for devices in PCI domains that do
not subscribe to usual "IOAPIC" format.

Signed-off-by: Keith Busch <keith.busch@intel.com>
CC: Bryan Veal <bryan.e.veal@intel.com>
CC: Dan Williams <dan.j.williams@intel.com>
CC: x86@kernel.org
CC: linux-kernel@vger.kernel.org
CC: linux-pci@vger.kernel.org
---
arch/x86/include/asm/pci.h | 3 +++
arch/x86/kernel/x86_init.c | 19 +++++++++++++++++++
2 files changed, 22 insertions(+)

diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 4625943..98f3802 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -20,6 +20,9 @@ struct pci_sysdata {
#ifdef CONFIG_X86_64
void *iommu; /* IOMMU private data */
#endif
+#ifdef CONFIG_PCI_MSI
+ struct x86_msi_ops *msi_ops;
+#endif
};

extern int pci_routeirq;
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 3839628..416de84 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -118,21 +118,40 @@ struct x86_msi_ops x86_msi = {
/* MSI arch specific hooks */
int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
+ struct pci_sysdata *sysdata = dev->bus->sysdata;
+
+ if (sysdata && sysdata->msi_ops && sysdata->msi_ops->setup_msi_irqs)
+ return sysdata->msi_ops->setup_msi_irqs(dev, nvec, type);
return x86_msi.setup_msi_irqs(dev, nvec, type);
}

void arch_teardown_msi_irqs(struct pci_dev *dev)
{
+ struct pci_sysdata *sysdata = dev->bus->sysdata;
+
+ if (sysdata && sysdata->msi_ops && sysdata->msi_ops->teardown_msi_irqs)
+ return sysdata->msi_ops->teardown_msi_irqs(dev);
x86_msi.teardown_msi_irqs(dev);
}

void arch_teardown_msi_irq(unsigned int irq)
{
+ struct msi_desc *desc = irq_get_msi_desc(irq);
+ struct pci_sysdata *sysdata = NULL;
+
+ if (desc)
+ sysdata = desc->dev->bus->sysdata;
+ if (sysdata && sysdata->msi_ops && sysdata->msi_ops->teardown_msi_irq)
+ return sysdata->msi_ops->teardown_msi_irq(irq);
x86_msi.teardown_msi_irq(irq);
}

void arch_restore_msi_irqs(struct pci_dev *dev)
{
+ struct pci_sysdata *sysdata = dev->bus->sysdata;
+
+ if (sysdata && sysdata->msi_ops && sysdata->msi_ops->restore_msi_irqs)
+ return sysdata->msi_ops->restore_msi_irqs(dev);
x86_msi.restore_msi_irqs(dev);
}
#endif
--
1.7.10.4


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