From d03f067a9d0a1cc09529427af9a15e15d32ba1de Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Fri, 12 Dec 2008 15:09:48 +0100 Subject: [PATCH] AMD IOMMU: add stats counter for map_sg requests Impact: see number of map_sg requests in debugfs Signed-off-by: Joerg Roedel --- arch/x86/kernel/amd_iommu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 71646c81421..859ca741745 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -67,6 +67,7 @@ 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); +DECLARE_STATS_COUNTER(cnt_map_sg); static struct dentry *stats_dir; static struct dentry *de_isolate; @@ -96,6 +97,7 @@ 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); + amd_iommu_stats_add(&cnt_map_sg); } #endif @@ -1377,6 +1379,8 @@ static int map_sg(struct device *dev, struct scatterlist *sglist, int mapped_elems = 0; u64 dma_mask; + INC_STATS_COUNTER(cnt_map_sg); + if (!check_device(dev)) return 0; -- 2.41.1