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Groups > linux.kernel > #1346849

[RFC v5 01/17] iommu: Add DOMAIN_ATTR_MSI_MAPPING attribute

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Introduce a new DOMAIN_ATTR_MSI_MAPPING domain attribute. If supported,
this means the MSI addresses need to be mapped in the IOMMU.

x86 IOMMUs typically don't expose the attribute since on x86, MSI write
transaction addresses always are within the 1MB PA region [FEE0_0000h -
FEF0_000h] window which directly targets the APIC configuration space and
hence bypass the sMMU. On ARM and PowerPC however MSI transactions are
conveyed through the IOMMU.

Signed-off-by: Bharat Bhushan <Bharat.Bhushan@freescale.com>
Signed-off-by: Eric Auger <eric.auger@linaro.org>

---

v4 -> v5:
- introduce the user in the next patch

RFC v1 -> v1:
- the data field is not used
- for this attribute domain_get_attr simply returns 0 if the MSI_MAPPING
  capability if needed or <0 if not.
- removed struct iommu_domain_msi_maps
---
 include/linux/iommu.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index a5c539f..a4fe04a 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -112,6 +112,7 @@ enum iommu_attr {
 	DOMAIN_ATTR_FSL_PAMU_ENABLE,
 	DOMAIN_ATTR_FSL_PAMUV1,
 	DOMAIN_ATTR_NESTING,	/* two stages of translation */
+	DOMAIN_ATTR_MSI_MAPPING, /* Require MSIs mapping in iommu */
 	DOMAIN_ATTR_MAX,
 };
 
-- 
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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