Messages in this thread Patch in this message | | | From | Sohil Mehta <> | Subject | [PATCH v2 5/6] iommu/vt-d: Add debugfs extension to show Pasid table contents | Date | Wed, 22 Nov 2017 11:25:45 -0800 |
| |
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/intel_iommu_ctx
IOMMU dmar0: Extended Root Table Addr:4310c4800 Extended Root tbl entries: Bus 0 L: 3ff5a8001 H: 0 Lower Context table entries for Bus: 0 [entry] DID :B :D .F Low High [80] 0000:00:0a.00 3ff5a9a05 102 Higher Context tbl entries for Bus: 0 [80] 0000:00:0a.00 40160000c 725140000000 Pasid Table Addr : ffff8db2c1600000 Pasid table entries for domain: 0000 [Entry] Contents [0] 26a609801
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> ---
v2: Fix seq_printf formatting
drivers/iommu/intel-iommu-debug.c | 32 ++++++++++++++++++++++++++++++++ drivers/iommu/intel-svm.c | 8 -------- include/linux/intel-svm.h | 8 ++++++++ 3 files changed, 40 insertions(+), 8 deletions(-)
diff --git a/drivers/iommu/intel-iommu-debug.c b/drivers/iommu/intel-iommu-debug.c index 3e1ce7d..22a0683 100644 --- a/drivers/iommu/intel-iommu-debug.c +++ b/drivers/iommu/intel-iommu-debug.c @@ -34,6 +34,31 @@ #define TOTAL_BUS_NR (256) /* full bus range 256 */ #ifdef CONFIG_INTEL_IOMMU_SVM +static void pasid_tbl_entry_show(struct seq_file *m, void *unused, + 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_printf(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); + } + } + } +} + static void ext_ctx_tbl_entry_show(struct seq_file *m, void *unused, struct intel_iommu *iommu, int bus, int ctx, struct context_entry *context, bool new_ext) @@ -57,6 +82,12 @@ static void ext_ctx_tbl_entry_show(struct seq_file *m, void *unused, } } #else /* CONFIG_INTEL_IOMMU_SVM */ +static void pasid_tbl_entry_show(struct seq_file *m, void *unused, + struct intel_iommu *iommu) +{ + return; +} + static void ext_ctx_tbl_entry_show(struct seq_file *m, void *unused, struct intel_iommu *iommu, int bus, int ctx, struct context_entry *context, bool new_ext) @@ -93,6 +124,7 @@ static void ctx_tbl_entry_show(struct seq_file *m, void *unused, context, new_ext); } } + pasid_tbl_entry_show(m, unused, iommu); out: spin_unlock_irqrestore(&iommu->lock, flags); } diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c index f6697e5..2003f23 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
| |