[PATCH 14/22] AMD IOMMU: add stats counter for map_sg requests

[Joerg Roedel <joerg.roedel@amd.com>]

Impact: see number of map_sg 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 18f26eb..bb0e03e 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -66,6 +66,7 @@ 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;
@@ -95,6 +96,7 @@ 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
@@ -1376,6 +1378,8 @@ 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;
 
-- 
1.5.6.4