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    Subject[PATCH 13/22] AMD IOMMU: add stats counter for unmap_single requests
    Date
    Impact: see number of unmap_single requests in debugfs

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    arch/x86/kernel/amd_iommu.c | 4 ++++
    1 files changed, 4 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
    index 4b23879..18f26eb 100644
    --- a/arch/x86/kernel/amd_iommu.c
    +++ b/arch/x86/kernel/amd_iommu.c
    @@ -65,6 +65,7 @@ static struct dma_ops_domain *find_protection_domain(u16 devid);

    DECLARE_STATS_COUNTER(compl_wait);
    DECLARE_STATS_COUNTER(cnt_map_single);
    +DECLARE_STATS_COUNTER(cnt_unmap_single);

    static struct dentry *stats_dir;
    static struct dentry *de_isolate;
    @@ -93,6 +94,7 @@ static void amd_iommu_stats_init(void)

    amd_iommu_stats_add(&compl_wait);
    amd_iommu_stats_add(&cnt_map_single);
    + amd_iommu_stats_add(&cnt_unmap_single);
    }

    #endif
    @@ -1320,6 +1322,8 @@ static void unmap_single(struct device *dev, dma_addr_t dma_addr,
    struct protection_domain *domain;
    u16 devid;

    + INC_STATS_COUNTER(cnt_unmap_single);
    +
    if (!check_device(dev) ||
    !get_device_resources(dev, &iommu, &domain, &devid))
    /* device not handled by any AMD IOMMU */
    --
    1.5.6.4



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