ARM smmu and smmu-v3 translate MSI transactions so their driver
are must implement domain_get_attr for DOMAIN_ATTR_MSI_RESV.
This allows to retrieve the size and alignment requirements of
the MSI reserved IOVA window.
Also IOMMU_DMA gets selected since it exposes the API to map the
MSIs.
Signed-off-by: Eric Auger <eric.au...@redhat.com>
---
drivers/iommu/Kconfig | 4 ++--
drivers/iommu/arm-smmu-v3.c | 7 +++++++
drivers/iommu/arm-smmu.c | 7 +++++++
3 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 8ee54d7..f5e5e4b 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -297,7 +297,7 @@ config SPAPR_TCE_IOMMU
config ARM_SMMU
bool "ARM Ltd. System MMU (SMMU) Support"
depends on (ARM64 || ARM) && MMU
- select IOMMU_API
+ select IOMMU_DMA
select IOMMU_IO_PGTABLE_LPAE
select ARM_DMA_USE_IOMMU if ARM
help
@@ -310,7 +310,7 @@ config ARM_SMMU
config ARM_SMMU_V3
bool "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
depends on ARM64
- select IOMMU_API
+ select IOMMU_DMA
select IOMMU_IO_PGTABLE_LPAE
select GENERIC_MSI_IRQ_DOMAIN
help
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 15c01c3..572cad8 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1559,6 +1559,9 @@ static int arm_smmu_domain_finalise(struct iommu_domain
*domain)
if (ret < 0)
free_io_pgtable_ops(pgtbl_ops);
+ if (domain->type == IOMMU_DOMAIN_UNMANAGED)
+ iommu_calc_msi_resv(domain);
+
return ret;
}
@@ -1840,6 +1843,10 @@ static int arm_smmu_domain_get_attr(struct iommu_domain
*domain,
case DOMAIN_ATTR_NESTING:
*(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED);
return 0;
+ case DOMAIN_ATTR_MSI_RESV:
+ *(struct iommu_domain_msi_resv *)data =
+ smmu_domain->domain.msi_resv;
+ return 0;
default:
return -ENODEV;
}
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index ac4aab9..ae20b9c 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -943,6 +943,9 @@ static int arm_smmu_init_domain_context(struct iommu_domain
*domain,
domain->geometry.aperture_end = (1UL << ias) - 1;
domain->geometry.force_aperture = true;
+ if (domain->type == IOMMU_DOMAIN_UNMANAGED)
+ iommu_calc_msi_resv(domain);
+
/* Initialise the context bank with our page table cfg */
arm_smmu_init_context_bank(smmu_domain, &pgtbl_cfg);
@@ -1486,6 +1489,10 @@ static int arm_smmu_domain_get_attr(struct iommu_domain
*domain,
case DOMAIN_ATTR_NESTING:
*(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED);
return 0;
+ case DOMAIN_ATTR_MSI_RESV:
+ *(struct iommu_domain_msi_resv *)data =
+ smmu_domain->domain.msi_resv;
+ return 0;
default:
return -ENODEV;
}
--
1.9.1
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