AMD IOMMU: add stats counter for map_single requests
Impact: see number of map_single requests in debugfs
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index b214357..ef37786 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -65,6 +65,7 @@
*/
DECLARE_STATS_COUNTER(compl_wait);
+DECLARE_STATS_COUNTER(cnt_map_single);
static struct dentry *stats_dir;
static struct dentry *de_isolate;
@@ -92,6 +93,7 @@
(u32 *)&amd_iommu_unmap_flush);
amd_iommu_stats_add(&compl_wait);
+ amd_iommu_stats_add(&cnt_map_single);
}
#endif
@@ -1278,6 +1280,8 @@
dma_addr_t addr;
u64 dma_mask;
+ INC_STATS_COUNTER(cnt_map_single);
+
if (!check_device(dev))
return bad_dma_address;