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    Subject[PATCH 16/22] AMD IOMMU: add stats counter for alloc_coherent requests
    Date
    Impact: see number of alloc_coherent 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 a2022de..e7180e9 100644
    --- a/arch/x86/kernel/amd_iommu.c
    +++ b/arch/x86/kernel/amd_iommu.c
    @@ -68,6 +68,7 @@ DECLARE_STATS_COUNTER(cnt_map_single);
    DECLARE_STATS_COUNTER(cnt_unmap_single);
    DECLARE_STATS_COUNTER(cnt_map_sg);
    DECLARE_STATS_COUNTER(cnt_unmap_sg);
    +DECLARE_STATS_COUNTER(cnt_alloc_coherent);

    static struct dentry *stats_dir;
    static struct dentry *de_isolate;
    @@ -99,6 +100,7 @@ static void amd_iommu_stats_init(void)
    amd_iommu_stats_add(&cnt_unmap_single);
    amd_iommu_stats_add(&cnt_map_sg);
    amd_iommu_stats_add(&cnt_unmap_sg);
    + amd_iommu_stats_add(&cnt_alloc_coherent);
    }

    #endif
    @@ -1480,6 +1482,8 @@ static void *alloc_coherent(struct device *dev, size_t size,
    phys_addr_t paddr;
    u64 dma_mask = dev->coherent_dma_mask;

    + INC_STATS_COUNTER(cnt_alloc_coherent);
    +
    if (!check_device(dev))
    return NULL;

    --
    1.5.6.4



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