AMD IOMMU: add statistics about total number of map requests

Impact: see total number of map requests in debugfs Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
mariux64 · Jan 3, 2009 · 8ecaf8f · 8ecaf8f
1 parent 5774f7c
commit 8ecaf8f
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
@@ -75,6 +75,7 @@ DECLARE_STATS_COUNTER(cross_page);
 DECLARE_STATS_COUNTER(domain_flush_single);
 DECLARE_STATS_COUNTER(domain_flush_all);
 DECLARE_STATS_COUNTER(alloced_io_mem);
+DECLARE_STATS_COUNTER(total_map_requests);
 
 static struct dentry *stats_dir;
 static struct dentry *de_isolate;
@@ -112,6 +113,7 @@ static void amd_iommu_stats_init(void)
 	amd_iommu_stats_add(&domain_flush_single);
 	amd_iommu_stats_add(&domain_flush_all);
 	amd_iommu_stats_add(&alloced_io_mem);
+	amd_iommu_stats_add(&total_map_requests);
 }
 
 #endif
@@ -1229,6 +1231,8 @@ static dma_addr_t __map_single(struct device *dev,
 	pages = iommu_num_pages(paddr, size, PAGE_SIZE);
 	paddr &= PAGE_MASK;
 
+	INC_STATS_COUNTER(total_map_requests);
+
 	if (pages > 1)
 		INC_STATS_COUNTER(cross_page);