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    Subject[PATCH v3 5/6] iommu/vt-d: Add debugfs extension to show Pasid table contents
    Date
    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: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>
    ---

    v3: No change

    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 0951d58..66a99f5 100644
    --- a/drivers/iommu/intel-iommu-debug.c
    +++ b/drivers/iommu/intel-iommu-debug.c
    @@ -47,6 +47,31 @@ static const struct file_operations __name ## _fops = \
    }

    #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)
    @@ -70,6 +95,12 @@ 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)
    @@ -106,6 +137,7 @@ 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
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