IOMMU group maintains a PASID array which stores the associated IOMMU domains. This patch introduces a helper function to do domain to PASID look up. It will be used by TLB flush and device-PASID attach verification.
Signed-off-by: Jacob Pan <[email protected]> --- drivers/iommu/iommu.c | 22 ++++++++++++++++++++++ include/linux/iommu.h | 6 +++++- 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 00d0262a1fe9..22f44833db64 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -3199,3 +3199,25 @@ struct iommu_domain *iommu_get_domain_for_iopf(struct device *dev, return domain; } + +ioasid_t iommu_get_pasid_from_domain(struct device *dev, struct iommu_domain *domain) +{ + struct iommu_domain *tdomain; + struct iommu_group *group; + unsigned long index; + ioasid_t pasid = INVALID_IOASID; + + group = iommu_group_get(dev); + if (!group) + return pasid; + + xa_for_each(&group->pasid_array, index, tdomain) { + if (domain == tdomain) { + pasid = index; + break; + } + } + iommu_group_put(group); + + return pasid; +} diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 36ad007084cc..c0440a4be699 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -694,7 +694,7 @@ void iommu_detach_device_pasid(struct iommu_domain *domain, struct device *dev, ioasid_t pasid); struct iommu_domain * iommu_get_domain_for_iopf(struct device *dev, ioasid_t pasid); - +ioasid_t iommu_get_pasid_from_domain(struct device *dev, struct iommu_domain *domain); #else /* CONFIG_IOMMU_API */ struct iommu_ops {}; @@ -1070,6 +1070,10 @@ iommu_get_domain_for_iopf(struct device *dev, ioasid_t pasid) { return NULL; } +static ioasid_t iommu_get_pasid_from_domain(struct device *dev, struct iommu_domain *domain) +{ + return INVALID_IOASID; +} #endif /* CONFIG_IOMMU_API */ #ifdef CONFIG_IOMMU_SVA -- 2.25.1 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
