Re: [PATCH V2 2/5] iommu: Add iommu_dma_free_cpu_cached_iovas function

[Lu Baolu]

On 9/4/20 4:18 AM, Tom Murphy wrote:
to dma-iommu ops
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 <murph...@tcd.ie>
---
  drivers/iommu/dma-iommu.c | 9 +++++++++
  include/linux/dma-iommu.h | 3 +++
  2 files changed, 12 insertions(+)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index f69dc9467d71..33f3f4f5edc5 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..316d22a4a860 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;


I will add below in the next version:

diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index 37df037788f0..ab4bffea3aaa 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -81,5 +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 */

Others looks good to me.

Best regards,
baolu