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authorJoerg Roedel <joerg.roedel@amd.com>2008-12-12 14:59:58 +0100
committerJoerg Roedel <joerg.roedel@amd.com>2009-01-03 14:11:58 +0100
commitda49f6df726ecaaee87757e8b65a560679d32f99 (patch)
treee17afeec5a4f7aabaf7754288bfba9caafa0d13e
parent7f26508bbb76ce86aad1130ef6b7f1a4bb7de0c2 (diff)
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>
-rw-r--r--arch/x86/kernel/amd_iommu.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index f98f70626bc..b21435748e0 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -64,6 +64,8 @@ static struct dma_ops_domain *find_protection_domain(u16 devid);
* 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 @@ static void amd_iommu_stats_init(void)
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 @@ static void __iommu_wait_for_completion(struct amd_iommu *iommu)
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 */