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>

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 69f367b..0c504b2 100644 (file)
--- 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);