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From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>, David Woodhouse <dwmw2@infradead.org>
Cc: kevin.tian@intel.com, ashok.raj@intel.com,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	jacob.jun.pan@intel.com
Subject: [PATCH 1/1] iommu/vt-d: Correctly check format of page table in debugfs
Date: Sat, 20 Jul 2019 10:01:26 +0800	[thread overview]
Message-ID: <20190720020126.9974-1-baolu.lu@linux.intel.com> (raw)

PASID support and enable bit in the context entry isn't the right
indicator for the type of tables (legacy or scalable mode). Check
the DMA_RTADDR_SMT bit in the root context pointer instead.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Sai Praneeth <sai.praneeth.prakhya@intel.com>
Fixes: dd5142ca5d24b ("iommu/vt-d: Add debugfs support to show scalable mode DMAR table internals")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 drivers/iommu/intel-iommu-debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/intel-iommu-debugfs.c b/drivers/iommu/intel-iommu-debugfs.c
index 73a552914455..e31c3b416351 100644
--- a/drivers/iommu/intel-iommu-debugfs.c
+++ b/drivers/iommu/intel-iommu-debugfs.c
@@ -235,7 +235,7 @@ static void ctx_tbl_walk(struct seq_file *m, struct intel_iommu *iommu, u16 bus)
 		tbl_wlk.ctx_entry = context;
 		m->private = &tbl_wlk;
 
-		if (pasid_supported(iommu) && is_pasid_enabled(context)) {
+		if (dmar_readq(iommu->reg + DMAR_RTADDR_REG) & DMA_RTADDR_SMT) {
 			pasid_dir_ptr = context->lo & VTD_PAGE_MASK;
 			pasid_dir_size = get_pasid_dir_size(context);
 			pasid_dir_walk(m, pasid_dir_ptr, pasid_dir_size);
-- 
2.17.1

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             reply	other threads:[~2019-07-20  2:02 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-20  2:01 Lu Baolu [this message]
2019-07-22  5:21 ` [PATCH 1/1] iommu/vt-d: Correctly check format of page table in debugfs Prakhya, Sai Praneeth
2019-07-25  1:40   ` Lu Baolu
2019-07-26 17:17     ` Prakhya, Sai Praneeth
2019-08-09  5:36 ` Lu Baolu
2019-08-09 15:29 ` Joerg Roedel

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