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Message-Id: <20231013135811.73953-2-Jingqi.liu@intel.com>
Date: Fri, 13 Oct 2023 21:58:09 +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: [PATH v5 1/3] 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 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,
--
2.21.3
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