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From: Konrad Rzeszutek Wilk on 4 Aug 2010 14:30
In preparation for non-privileged domains to disable PCI devices'
MSI/MSIx, we need to augment arch_teardown_msi_irqs to make
a call to the privileged domain (patch to follow).

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge(a)citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk(a)oracle.com>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: "H. Peter Anvin" <hpa(a)zytor.com>
Cc: x86(a)kernel.org
Cc: Jesse Barnes <jbarnes(a)virtuousgeek.org>
---
arch/x86/include/asm/pci.h | 1 +
arch/x86/kernel/apic/io_apic.c | 14 ++++++++++++++
2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 404a880..bcf84e1 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -94,6 +94,7 @@ extern void pci_iommu_alloc(void);

/* MSI arch hook */
#define arch_setup_msi_irqs arch_setup_msi_irqs
+#define arch_teardown_msi_irqs arch_teardown_msi_irqs

#define PCI_DMA_BUS_IS_PHYS (dma_ops->is_phys)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 8353c40..a8d069e 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3597,6 +3597,20 @@ void arch_teardown_msi_irq(unsigned int irq)
destroy_irq(irq);
}

+void arch_teardown_msi_irqs(struct pci_dev *dev)
+{
+ struct msi_desc *entry;
+
+ list_for_each_entry(entry, &dev->msi_list, list) {
+ int i, nvec;
+ if (entry->irq == 0)
+ continue;
+ nvec = 1 << entry->msi_attrib.multiple;
+ for (i = 0; i < nvec; i++)
+ arch_teardown_msi_irq(entry->irq + i);
+ }
+}
+
#if defined (CONFIG_DMAR) || defined (CONFIG_INTR_REMAP)
#ifdef CONFIG_SMP
static int dmar_msi_set_affinity(unsigned int irq, const struct cpumask *mask)
--
1.7.0.1

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