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[PATCH v8 1/8] genirq/msi: Add a new MSI_FLAG_IRQ_REMAPPING flag

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Let's introduce a new msi_domain_info flag value, MSI_FLAG_IRQ_REMAPPING
meant to tell the domain supports IRQ REMAPPING, also known as Interrupt
Translation Service. On Intel HW this IRQ remapping capability is
abstracted on IOMMU side while on ARM it is abstracted on MSI controller
side. This flag will be used to know whether the MSI passthrough is
safe.

Signed-off-by: Eric Auger <eric.auger@linaro.org>

---

v4 -> v5:
- seperate flag introduction from first user addition (ITS)
---
 include/linux/msi.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/msi.h b/include/linux/msi.h
index 8b425c6..08441b1 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -270,6 +270,8 @@ enum {
 	MSI_FLAG_MULTI_PCI_MSI		= (1 << 3),
 	/* Support PCI MSIX interrupts */
 	MSI_FLAG_PCI_MSIX		= (1 << 4),
+	/* Support MSI IRQ remapping service */
+	MSI_FLAG_IRQ_REMAPPING		= (1 << 5),
 };
 
 int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
-- 
1.9.1

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[PATCH v8 0/8] KVM PCIe/MSI passthrough on ARM/ARM64: kernel part 2/3: msi changes Eric Auger <eric.auger@linaro.org> - 2016-04-28 10:30 +0200
  [PATCH v8 4/8] genirq/msi: msi_compose wrapper Eric Auger <eric.auger@linaro.org> - 2016-04-28 10:30 +0200
  [PATCH v8 5/8] genirq/irq: introduce msi_doorbell_info Eric Auger <eric.auger@linaro.org> - 2016-04-28 10:30 +0200
    Re: [PATCH v8 5/8] genirq/irq: introduce msi_doorbell_info Marc Zyngier <marc.zyngier@arm.com> - 2016-05-04 15:00 +0200
  [PATCH v8 1/8] genirq/msi: Add a new MSI_FLAG_IRQ_REMAPPING flag Eric Auger <eric.auger@linaro.org> - 2016-04-28 10:30 +0200
  [PATCH v8 3/8] genirq/msi: export msi_get_domain_info Eric Auger <eric.auger@linaro.org> - 2016-04-28 10:30 +0200
  [PATCH v8 7/8] genirq/msi: map/unmap the MSI doorbells on msi_domain_alloc/free_irqs Eric Auger <eric.auger@linaro.org> - 2016-04-28 10:30 +0200
    Re: [PATCH v8 7/8] genirq/msi: map/unmap the MSI doorbells on  msi_domain_alloc/free_irqs Marc Zyngier <marc.zyngier@arm.com> - 2016-05-04 15:30 +0200
      Re: [PATCH v8 7/8] genirq/msi: map/unmap the MSI doorbells on  msi_domain_alloc/free_irqs Eric Auger <eric.auger@linaro.org> - 2016-05-04 17:30 +0200
  [PATCH v8 2/8] irqchip/gic-v3-its: ITS advertises MSI_FLAG_IRQ_REMAPPING Eric Auger <eric.auger@linaro.org> - 2016-04-28 10:30 +0200

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