iommu/vt-d: Correctly check format of page table in debugfs

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>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel-iommu-debugfs.c b/drivers/iommu/intel-iommu-debugfs.c
index 2b25d9c5933604eb70d6a83a7e1a91daa10e29d7..471f05d452e0198f3d2837f2a83e13d0984e1a12 100644 (file)
--- 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);