[Intel-gfx] [PATCH v4 2/7] iommu: Add iommu_dma_free_cpu_cached_iovas()

Lu Baolu
2020-09-27T06:40:56Z

From: Tom Murphy <murphyt7@tcd.ie>

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>
---
drivers/iommu/dma-iommu.c | 9 +++++++++
include/linux/dma-iommu.h | 8 ++++++++
2 files changed, 17 insertions(+)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 1b8ef3a2cbc3..fb84cfa83703 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -50,6 +50,15 @@ 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;
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index 2112f21f73d8..706b68d1359b 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -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 */
--
2.17.1