AMD IOMMU: add stats counter for single iommu domain tlb flushes

Impact: see number of single iommu domain tlb flushes 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 f545503..e99022d 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -72,6 +72,7 @@ DECLARE_STATS_COUNTER(cnt_unmap_sg);
 DECLARE_STATS_COUNTER(cnt_alloc_coherent);
 DECLARE_STATS_COUNTER(cnt_free_coherent);
 DECLARE_STATS_COUNTER(cross_page);
+DECLARE_STATS_COUNTER(domain_flush_single);
 
 static struct dentry *stats_dir;
 static struct dentry *de_isolate;
@@ -106,6 +107,7 @@ static void amd_iommu_stats_init(void)
        amd_iommu_stats_add(&cnt_alloc_coherent);
        amd_iommu_stats_add(&cnt_free_coherent);
        amd_iommu_stats_add(&cross_page);
+       amd_iommu_stats_add(&domain_flush_single);
 }
 
 #endif
@@ -413,6 +415,8 @@ static void iommu_flush_tlb(struct amd_iommu *iommu, u16 domid)
 {
        u64 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
 
+       INC_STATS_COUNTER(domain_flush_single);
+
        iommu_queue_inv_iommu_pages(iommu, address, domid, 0, 1);
 }