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iommu: Add iommu_dma_free_cpu_cached_iovas() 

Add a iommu_dma_free_cpu_cached_iovas function to allow drivers which
use the dma-iommu ops to free cached cpu iovas.

Signed-off-by: Tom Murphy <murphyt7@tcd.ie>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Tested-by: Logan Gunthorpe <logang@deltatee.com>
Link: https://lore.kernel.org/r/20201124082057.2614359-3-baolu.lu@linux.intel.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Tom Murphy 2020-11-24 16:20:52 +08:00 committed by Will Deacon
parent 2a2b8eaa5b
commit 230309d08b
2 changed files with 17 additions and 0 deletions
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9
drivers/iommu/dma-iommu.c
View File

@ -49,6 +49,15 @@ struct iommu_dma_cookie {
struct iommu_domain *fq_domain;
};
void iommu_dma_free_cpu_cached_iovas(unsigned int cpu,
struct iommu_domain *domain)
{
struct iommu_dma_cookie *cookie = domain->iova_cookie;
struct iova_domain *iovad = &cookie->iovad;
free_cpu_cached_iovas(cpu, iovad);
}
static void iommu_dma_entry_dtor(unsigned long data)
{
struct page *freelist = (struct page *)data;

8
include/linux/dma-iommu.h
View File

@ -37,6 +37,9 @@ void iommu_dma_compose_msi_msg(struct msi_desc *desc,
void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
void iommu_dma_free_cpu_cached_iovas(unsigned int cpu,
struct iommu_domain *domain);
#else /* CONFIG_IOMMU_DMA */
struct iommu_domain;
@ -78,5 +81,10 @@ static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_he
{
}
static inline void iommu_dma_free_cpu_cached_iovas(unsigned int cpu,
struct iommu_domain *domain)
{
}
#endif /* CONFIG_IOMMU_DMA */
#endif /* __DMA_IOMMU_H */