Messages in this thread Patch in this message | | | From | Sohil Mehta <> | Subject | [PATCH v6 4/5] iommu/vt-d: Add debugfs support to show Pasid table contents | Date | Tue, 9 Jan 2018 19:48:21 -0800 |
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From: Gayatri Kammela <gayatri.kammela@intel.com>
Debugfs extension to dump the internals such as pasid table entries for each IOMMU to the userspace.
Example of such dump in Kabylake:
root@OTC-KBLH-01:~# cat /sys/kernel/debug/intel_iommu/dmar_translation_struct
IOMMU dmar0: Extended Root Table Addr:402b9e800 Extended Root table entries: Bus 0 L: 402150001 H: 0 Lower Context table entries for Bus: 0 [entry] DID :B :D .F Low High [80] 0000:00:0a.00 40214fa05 102 Higher Context table entries for Bus: 0 [80] 0000:00:0a.00 40260000c 0 Pasid Table Addr : ffff8e2d42600000 Pasid table entries for domain 0: [Entry] Contents [0] 12c409801
Cc: Sohil Mehta <sohil.mehta@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com> Cc: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Gayatri Kammela <gayatri.kammela@intel.com> ---
v6: No change
v5: No change
v4: Remove the unused function parameter Fix checkpatch.pl warnings
v3: No change
v2: Fix seq_printf formatting
drivers/iommu/intel-iommu-debug.c | 31 +++++++++++++++++++++++++++++++ drivers/iommu/intel-svm.c | 8 -------- include/linux/intel-svm.h | 8 ++++++++ 3 files changed, 39 insertions(+), 8 deletions(-)
diff --git a/drivers/iommu/intel-iommu-debug.c b/drivers/iommu/intel-iommu-debug.c index 9ee9a50..d25f7c99 100644 --- a/drivers/iommu/intel-iommu-debug.c +++ b/drivers/iommu/intel-iommu-debug.c @@ -38,6 +38,36 @@ static const struct file_operations __name ## _fops = \ .owner = THIS_MODULE, \ } +#ifdef CONFIG_INTEL_IOMMU_SVM +static void pasid_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu) +{ + int pasid_size = 0, i; + + if (ecap_pasid(iommu->ecap)) { + pasid_size = intel_iommu_get_pts(iommu); + seq_printf(m, "Pasid Table Addr : %p\n", iommu->pasid_table); + + if (iommu->pasid_table) { + seq_printf(m, "Pasid table entries for domain %d:\n", + iommu->segment); + seq_puts(m, "[Entry]\t\tContents\n"); + + /* Publish the pasid table entries here */ + for (i = 0; i < pasid_size; i++) { + if (!iommu->pasid_table[i].val) + continue; + seq_printf(m, "[%d]\t\t%04llx\n", i, + iommu->pasid_table[i].val); + } + } + } +} +#else /* CONFIG_INTEL_IOMMU_SVM */ +static void pasid_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu) +{ +} +#endif /* CONFIG_INTEL_IOMMU_SVM */ + static void ctx_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu, int bus, bool ext, bool new_ext) { @@ -71,6 +101,7 @@ static void ctx_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu, } } } + pasid_tbl_entry_show(m, iommu); out: spin_unlock_irqrestore(&iommu->lock, flags); } diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c index ed1cf7c..c646724 100644 --- a/drivers/iommu/intel-svm.c +++ b/drivers/iommu/intel-svm.c @@ -28,14 +28,6 @@ static irqreturn_t prq_event_thread(int irq, void *d); -struct pasid_entry { - u64 val; -}; - -struct pasid_state_entry { - u64 val; -}; - int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu) { struct page *pages; diff --git a/include/linux/intel-svm.h b/include/linux/intel-svm.h index 733eaf9..a8abad6 100644 --- a/include/linux/intel-svm.h +++ b/include/linux/intel-svm.h @@ -18,6 +18,14 @@ struct device; +struct pasid_entry { + u64 val; +}; + +struct pasid_state_entry { + u64 val; +}; + struct svm_dev_ops { void (*fault_cb)(struct device *dev, int pasid, u64 address, u32 private, int rwxp, int response); -- 2.7.4
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