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

[firefly-linux-kernel-4.4.55.git] / arch / x86 / kernel / amd_iommu.c

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 112412d733abea86b8340d337cf1fb320c1a29ca..e99022d3a3944ecf64a99431426cee939ae03e7b 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -71,6 +71,8 @@ DECLARE_STATS_COUNTER(cnt_map_sg);
 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;
@@ -104,6 +106,8 @@ static void amd_iommu_stats_init(void)
        amd_iommu_stats_add(&cnt_unmap_sg);
        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
@@ -411,6 +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);
 }
 
@@ -1217,6 +1223,9 @@ static dma_addr_t __map_single(struct device *dev,
        pages = iommu_num_pages(paddr, size, PAGE_SIZE);
        paddr &= PAGE_MASK;
 
+       if (pages > 1)
+               INC_STATS_COUNTER(cross_page);
+
        if (align)
                align_mask = (1UL << get_order(size)) - 1;