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[v1,4/4] iommu: Turn iova_cookie to dma-iommu private pointer

Message ID c51c2543992b686934f7daab56a3f1c6c46ad206.1740600272.git.nicolinc@nvidia.com (mailing list archive)
State New
Headers show
Series iommu: Isolate iova_cookie to actual owners | expand

Commit Message

Nicolin Chen Feb. 26, 2025, 8:16 p.m. UTC 
Now that iommufd does not rely on dma-iommu.c for any purpose. We can
combine the dma-iommu.c iova_cookie and the iommufd_hwpt under the same
union. This union is effectively 'owner data' and can be used by the
entity that allocated the domain. Note that legacy vfio type1 flows
continue to use dma-iommu.c for sw_msi and still need iova_cookie.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 include/linux/iommu.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 6f66980e0c86..c2f9dc0572da 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -216,7 +216,6 @@  struct iommu_domain {
 	const struct iommu_ops *owner; /* Whose domain_alloc we came from */
 	unsigned long pgsize_bitmap;	/* Bitmap of page sizes in use */
 	struct iommu_domain_geometry geometry;
-	struct iommu_dma_cookie *iova_cookie;
 	int (*iopf_handler)(struct iopf_group *group);
 
 #if IS_ENABLED(CONFIG_IRQ_MSI_IOMMU)
@@ -225,6 +224,7 @@  struct iommu_domain {
 #endif
 
 	union { /* Pointer usable by owner of the domain */
+		struct iommu_dma_cookie *iova_cookie; /* dma-iommu */
 		struct iommufd_hw_pagetable *iommufd_hwpt; /* iommufd */
 	};
 	union { /* Fault handler */