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[RFC v5 08/17] 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 a2a0068..03eda72 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -261,6 +261,8 @@ 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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[RFC v5 00/17] KVM PCIe/MSI passthrough on ARM/ARM64 Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:30 +0100
  [RFC v5 07/17] dma-reserved-iommu: iommu_unmap_reserved Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:30 +0100
  [RFC v5 02/17] iommu/arm-smmu: advertise DOMAIN_ATTR_MSI_MAPPING attribute Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:30 +0100
  [RFC v5 17/17] vfio/type1: return MSI mapping requirements with VFIO_IOMMU_GET_INFO Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:30 +0100
  [RFC v5 16/17] iommu/arm-smmu: do not advertise IOMMU_CAP_INTR_REMAP Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:30 +0100
  [RFC v5 14/17] vfio: allow the user to register reserved iova range for MSI mapping Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:30 +0100
  [RFC v5 01/17] iommu: Add DOMAIN_ATTR_MSI_MAPPING attribute Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:30 +0100
  [RFC v5 10/17] msi: export msi_get_domain_info Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:30 +0100
  [RFC v5 09/17] irqchip/gic-v3-its: ITS advertises MSI_FLAG_IRQ_REMAPPING Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:30 +0100
  [RFC v5 08/17] msi: Add a new MSI_FLAG_IRQ_REMAPPING flag Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:30 +0100
  [RFC v5 12/17] msi: IOMMU map the doorbell address when needed Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:30 +0100
  [RFC v5 04/17] dma-reserved-iommu: alloc/free_reserved_iova_domain Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:30 +0100
  [RFC v5 13/17] vfio: introduce VFIO_IOVA_RESERVED vfio_dma type Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:40 +0100
  [RFC v5 11/17] msi: msi_compose wrapper Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:40 +0100
  [RFC v5 15/17] vfio/type1: also check IRQ remapping capability at msi domain Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:40 +0100
  [RFC v5 05/17] dma-reserved-iommu: reserved binding rb-tree and helpers Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:40 +0100
  [RFC v5 06/17] dma-reserved-iommu: iommu_get/put_single_reserved Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:40 +0100
  [RFC v5 03/17] iommu: introduce a reserved iova cookie Eric Auger <eric.auger@linaro.org> - 2016-03-01 19:40 +0100
    Re: [RFC v5 03/17] iommu: introduce a reserved iova cookie Julien Grall <julien.grall@arm.com> - 2016-03-03 17:30 +0100
  Re: [RFC v5 00/17] KVM PCIe/MSI passthrough on ARM/ARM64 "Jaggi, Manish" <Manish.Jaggi@caviumnetworks.com> - 2016-03-02 10:50 +0100
    Re: [RFC v5 00/17] KVM PCIe/MSI passthrough on ARM/ARM64 Eric Auger <eric.auger@linaro.org> - 2016-03-02 13:40 +0100

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