[PATCH v11 6/8] iommu/msi-iommu: iommu_msi_domain
From: eric.auger@redhat.com (Eric Auger)
Date: 2016-07-19 12:55:58
Also in:
kvm, kvmarm, linux-iommu, lkml
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
This function checks whether - the device belongs to a non default iommu domain - this iommu domain requires the MSI address to be mapped. If those conditions are met, the function returns the iommu domain to be used for mapping the MSI doorbell; else it returns NULL. Signed-off-by: Eric Auger <eric.auger@redhat.com> --- v8 -> v9: - use iommu_msi_supported v7 -> v8: - renamed iommu_msi_mapping_desc_to_domain to iommu_msi_domain - the function now takes a struct device * - use DOMAIN_ATTR_MSI_GEOMETRY attribute --- drivers/iommu/msi-iommu.c | 17 +++++++++++++++++ include/linux/msi-iommu.h | 14 ++++++++++++++ 2 files changed, 31 insertions(+)
diff --git a/drivers/iommu/msi-iommu.c b/drivers/iommu/msi-iommu.c
index 57017cb..41a5823 100644
--- a/drivers/iommu/msi-iommu.c
+++ b/drivers/iommu/msi-iommu.c@@ -248,3 +248,20 @@ unlock: } } EXPORT_SYMBOL_GPL(iommu_msi_put_doorbell_iova); + +struct iommu_domain *iommu_msi_domain(struct device *dev) +{ + struct iommu_domain *d = iommu_get_domain_for_dev(dev); + struct iommu_domain_msi_geometry msi_geometry; + + if (!d || (d->type == IOMMU_DOMAIN_DMA)) + return NULL; + + iommu_domain_get_attr(d, DOMAIN_ATTR_MSI_GEOMETRY, &msi_geometry); + if (!msi_geometry.iommu_msi_supported) + return NULL; + + return d; +} +EXPORT_SYMBOL_GPL(iommu_msi_domain); +
diff --git a/include/linux/msi-iommu.h b/include/linux/msi-iommu.h
index 1cd115f..114bd69 100644
--- a/include/linux/msi-iommu.h
+++ b/include/linux/msi-iommu.h@@ -81,6 +81,15 @@ int iommu_msi_get_doorbell_iova(struct iommu_domain *domain, */ void iommu_msi_put_doorbell_iova(struct iommu_domain *domain, phys_addr_t addr); +/** + * iommu_msi_domain: in case the device is upstream to an IOMMU and this IOMMU + * translates the MSI transaction, returns the iommu domain the MSI doorbell + * address must be mapped in; else returns NULL. + * + * @dev: device handle + */ +struct iommu_domain *iommu_msi_domain(struct device *dev); + #else static inline int
@@ -100,5 +109,10 @@ static inline int iommu_msi_get_doorbell_iova(struct iommu_domain *domain, static inline void iommu_msi_put_doorbell_iova(struct iommu_domain *domain, phys_addr_t addr) {} +static inline struct iommu_domain *iommu_msi_domain(struct device *dev) +{ + return NULL; +} + #endif /* CONFIG_IOMMU_MSI */ #endif /* __MSI_IOMMU_H */
--
1.9.1