From ccc21213f013834b484cdcc738e282f963fcfc97 Mon Sep 17 00:00:00 2001 From: Mostafa Saleh Date: Fri, 9 Jan 2026 17:18:03 +0000 Subject: iommu: Add calls for IOMMU_DEBUG_PAGEALLOC Add calls for the new iommu debug config IOMMU_DEBUG_PAGEALLOC: - iommu_debug_init: Enable the debug mode if configured by the user. - iommu_debug_map: Track iommu pages mapped, using physical address. - iommu_debug_unmap_begin: Track start of iommu unmap operation, with IOVA and size. - iommu_debug_unmap_end: Track the end of unmap operation, passing the actual unmapped size versus the tracked one at unmap_begin. We have to do the unmap_begin/end as once pages are unmapped we lose the information of the physical address. This is racy, but the API is racy by construction as it uses refcounts and doesn't attempt to lock/synchronize with the IOMMU API as that will be costly, meaning that possibility of false negative exists. Reviewed-by: Samiullah Khawaja Reviewed-by: Lu Baolu Reviewed-by: Pranjal Shrivastava Signed-off-by: Mostafa Saleh Signed-off-by: Joerg Roedel --- include/linux/iommu-debug-pagealloc.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/iommu-debug-pagealloc.h b/include/linux/iommu-debug-pagealloc.h index 83e64d70bf6c..a439d6815ca1 100644 --- a/include/linux/iommu-debug-pagealloc.h +++ b/include/linux/iommu-debug-pagealloc.h @@ -9,6 +9,7 @@ #define __LINUX_IOMMU_DEBUG_PAGEALLOC_H #ifdef CONFIG_IOMMU_DEBUG_PAGEALLOC +DECLARE_STATIC_KEY_FALSE(iommu_debug_initialized); extern struct page_ext_operations page_iommu_debug_ops; -- cgit v1.2.3