AMD IOMMU: add stats counter for unmap_sg requests

Impact: see number of unmap_sg requests in debugfs

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 859ca741745b..49f2c8533e12 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -68,6 +68,7 @@ DECLARE_STATS_COUNTER(compl_wait);
 DECLARE_STATS_COUNTER(cnt_map_single);
 DECLARE_STATS_COUNTER(cnt_unmap_single);
 DECLARE_STATS_COUNTER(cnt_map_sg);
+DECLARE_STATS_COUNTER(cnt_unmap_sg);
 
 static struct dentry *stats_dir;
 static struct dentry *de_isolate;
@@ -98,6 +99,7 @@ static void amd_iommu_stats_init(void)
         amd_iommu_stats_add(&cnt_map_single);
         amd_iommu_stats_add(&cnt_unmap_single);
         amd_iommu_stats_add(&cnt_map_sg);
+        amd_iommu_stats_add(&cnt_unmap_sg);
 }
 
 #endif
@@ -1443,6 +1445,8 @@ static void unmap_sg(struct device *dev, struct scatterlist *sglist,
         u16 devid;
         int i;
 
+        INC_STATS_COUNTER(cnt_unmap_sg);
+
         if (!check_device(dev) ||
             !get_device_resources(dev, &iommu, &domain, &devid))
                 return;