This new call-back will be used to check if the domain attach need be deferred for now. If yes, the domain attach/detach will return directly.
Suggested-by: Joerg Roedel <[email protected]> Signed-off-by: Baoquan He <[email protected]> --- drivers/iommu/iommu.c | 8 ++++++++ include/linux/iommu.h | 1 + 2 files changed, 9 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index dbe7f65..e5cb9b1 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1096,6 +1096,10 @@ static int __iommu_attach_device(struct iommu_domain *domain, struct device *dev) { int ret; + if ((domain->ops->is_attach_deferred != NULL) && + domain->ops->is_attach_deferred(domain, dev)) + return 0; + if (unlikely(domain->ops->attach_dev == NULL)) return -ENODEV; @@ -1137,6 +1141,10 @@ EXPORT_SYMBOL_GPL(iommu_attach_device); static void __iommu_detach_device(struct iommu_domain *domain, struct device *dev) { + if ((domain->ops->is_attach_deferred != NULL) && + domain->ops->is_attach_deferred(domain, dev)) + return; + if (unlikely(domain->ops->detach_dev == NULL)) return; diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 0ff5111..5aa3742 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -200,6 +200,7 @@ struct iommu_ops { u32 (*domain_get_windows)(struct iommu_domain *domain); int (*of_xlate)(struct device *dev, struct of_phandle_args *args); + bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev); unsigned long pgsize_bitmap; }; -- 2.5.5
