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authorJoerg Roedel <joerg.roedel@amd.com>2008-12-12 17:09:48 +0300
committerJoerg Roedel <joerg.roedel@amd.com>2009-01-03 16:11:59 +0300
commitd03f067a9d0a1cc09529427af9a15e15d32ba1de (patch)
tree6d09e8029cd35ed8bf769cb8af662fbac81a1a30 /arch
parent146a6917fc30616401a090f55cff2b855ee5b2ab (diff)
downloadlinux-d03f067a9d0a1cc09529427af9a15e15d32ba1de.tar.xz
AMD IOMMU: add stats counter for map_sg requests
Impact: see number of map_sg requests in debugfs Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/amd_iommu.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 71646c81421a..859ca741745b 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;