diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/iommu-debug-pagealloc.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/iommu/iommu-debug-pagealloc.c b/drivers/iommu/iommu-debug-pagealloc.c index 9eb49e1230ee..c080a38f45a4 100644 --- a/drivers/iommu/iommu-debug-pagealloc.c +++ b/drivers/iommu/iommu-debug-pagealloc.c @@ -9,6 +9,7 @@ #include <linux/iommu-debug-pagealloc.h> #include <linux/kernel.h> #include <linux/page_ext.h> +#include <linux/page_owner.h> #include "iommu-priv.h" @@ -73,6 +74,28 @@ static size_t iommu_debug_page_size(struct iommu_domain *domain) return 1UL << __ffs(domain->pgsize_bitmap); } +static bool iommu_debug_page_count(const struct page *page) +{ + unsigned int ref; + struct page_ext *page_ext = page_ext_get(page); + struct iommu_debug_metadata *d = get_iommu_data(page_ext); + + ref = atomic_read(&d->ref); + page_ext_put(page_ext); + return ref != 0; +} + +void __iommu_debug_check_unmapped(const struct page *page, int numpages) +{ + while (numpages--) { + if (WARN_ON(iommu_debug_page_count(page))) { + pr_warn("iommu: Detected page leak!\n"); + dump_page_owner(page); + } + page++; + } +} + void __iommu_debug_map(struct iommu_domain *domain, phys_addr_t phys, size_t size) { size_t off, end; |