iommu/vt-d: debugfs: Dump entry pointing to huge page

For the page table entry pointing to a huge page, the data below the
level of the huge page is meaningless and does not need to be dumped.

Signed-off-by: Jingqi Liu <Jingqi.liu@intel.com>
Link: https://lore.kernel.org/r/20231013135811.73953-2-Jingqi.liu@intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel/debugfs.c b/drivers/iommu/intel/debugfs.c
index 1f925285104eee0c318e7753e696d7f0188e88b1..497c1561d3d21aefa291d67041a48b846b415581 100644 (file)
--- a/drivers/iommu/intel/debugfs.c
+++ b/drivers/iommu/intel/debugfs.c
@@ -311,9 +311,14 @@ static inline unsigned long level_to_directory_size(int level)
 static inline void
 dump_page_info(struct seq_file *m, unsigned long iova, u64 *path)
 {
-       seq_printf(m, "0x%013lx |\t0x%016llx\t0x%016llx\t0x%016llx\t0x%016llx\t0x%016llx\n",
-                  iova >> VTD_PAGE_SHIFT, path[5], path[4],
-                  path[3], path[2], path[1]);
+       seq_printf(m, "0x%013lx |\t0x%016llx\t0x%016llx\t0x%016llx",
+                  iova >> VTD_PAGE_SHIFT, path[5], path[4], path[3]);
+       if (path[2]) {
+               seq_printf(m, "\t0x%016llx", path[2]);
+               if (path[1])
+                       seq_printf(m, "\t0x%016llx", path[1]);
+       }
+       seq_putc(m, '\n');
 }
 
 static void pgtable_walk_level(struct seq_file *m, struct dma_pte *pde,