linux-kernel - [PATCH 5/5] iommu/vt-d: debugfs: Dump entry pointing to huge page

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Date:   Sun, 25 Jun 2023 23:04:42 +0800
From:   Jingqi Liu <Jingqi.liu@...el.com>
To:     iommu@...ts.linux.dev, Lu Baolu <baolu.lu@...ux.intel.com>,
        Tian Kevin <kevin.tian@...el.com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     linux-kernel@...r.kernel.org, Jingqi Liu <Jingqi.liu@...el.com>
Subject: [PATCH 5/5] 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@...el.com>
---
 drivers/iommu/intel/debugfs.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel/debugfs.c b/drivers/iommu/intel/debugfs.c
index e4d3b7836076..f5e26cc21905 100644
--- a/drivers/iommu/intel/debugfs.c
+++ b/drivers/iommu/intel/debugfs.c
@@ -326,9 +326,14 @@ 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,
-- 
2.21.3