linux-kernel - [PATCH 2/4] iommu/vt-d: debugfs: Dump entry pointing to huge page

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Date:   Mon, 16 Oct 2023 11:28:28 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Jingqi Liu <Jingqi.liu@...el.com>,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] iommu/vt-d: debugfs: Dump entry pointing to huge page

From: Jingqi Liu <Jingqi.liu@...el.com>

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>
Link: https://lore.kernel.org/r/20231013135811.73953-2-Jingqi.liu@intel.com
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.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 1f925285104e..497c1561d3d2 100644
--- 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,
-- 
2.34.1