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    Subject[PATCH 22/22] AMD IOMMU: add statistics about total number of map requests
    Date
    Impact: see total number of map 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 9c34902..c8d4301 100644
    --- a/arch/x86/kernel/amd_iommu.c
    +++ b/arch/x86/kernel/amd_iommu.c
    @@ -74,6 +74,7 @@ DECLARE_STATS_COUNTER(cross_page);
    DECLARE_STATS_COUNTER(domain_flush_single);
    DECLARE_STATS_COUNTER(domain_flush_all);
    DECLARE_STATS_COUNTER(alloced_io_mem);
    +DECLARE_STATS_COUNTER(total_map_requests);

    static struct dentry *stats_dir;
    static struct dentry *de_isolate;
    @@ -111,6 +112,7 @@ static void amd_iommu_stats_init(void)
    amd_iommu_stats_add(&domain_flush_single);
    amd_iommu_stats_add(&domain_flush_all);
    amd_iommu_stats_add(&alloced_io_mem);
    + amd_iommu_stats_add(&total_map_requests);
    }

    #endif
    @@ -1228,6 +1230,8 @@ static dma_addr_t __map_single(struct device *dev,
    pages = iommu_num_pages(paddr, size, PAGE_SIZE);
    paddr &= PAGE_MASK;

    + INC_STATS_COUNTER(total_map_requests);
    +
    if (pages > 1)
    INC_STATS_COUNTER(cross_page);

    --
    1.5.6.4



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