AMD IOMMU: add stats counter for completion wait events
Impact: see number of completion wait events 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 f98f706..b214357 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -64,6 +64,8 @@
* Initialization code for statistics collection
*/
+DECLARE_STATS_COUNTER(compl_wait);
+
static struct dentry *stats_dir;
static struct dentry *de_isolate;
static struct dentry *de_fflush;
@@ -88,6 +90,8 @@
de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir,
(u32 *)&amd_iommu_unmap_flush);
+
+ amd_iommu_stats_add(&compl_wait);
}
#endif
@@ -249,6 +253,8 @@
unsigned status = 0;
unsigned long i = 0;
+ INC_STATS_COUNTER(compl_wait);
+
while (!ready && (i < EXIT_LOOP_COUNT)) {
++i;
/* wait for the bit to become one */