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iommu: Add is_attach_deferred call-back to iommu-ops 

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.

Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
hifive-unleashed-5.1
Baoquan He 2017-08-09 16:33:40 +08:00 committed by Joerg Roedel
parent 53019a9e88
commit e01d1913b0
2 changed files with 9 additions and 0 deletions
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8
drivers/iommu/iommu.c
View File

@ -1283,6 +1283,10 @@ 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;
@ -1324,6 +1328,10 @@ 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;

1
include/linux/iommu.h
View File

@ -225,6 +225,7 @@ 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;
};