AMD IOMMU: add statistics about allocated io memory

Impact: see amount of allocated io memory 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 a897c72..69f367b 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -74,6 +74,7 @@ DECLARE_STATS_COUNTER(cnt_free_coherent);
 DECLARE_STATS_COUNTER(cross_page);
 DECLARE_STATS_COUNTER(domain_flush_single);
 DECLARE_STATS_COUNTER(domain_flush_all);
+DECLARE_STATS_COUNTER(alloced_io_mem);
 
 static struct dentry *stats_dir;
 static struct dentry *de_isolate;
@@ -110,6 +111,7 @@ static void amd_iommu_stats_init(void)
        amd_iommu_stats_add(&cross_page);
        amd_iommu_stats_add(&domain_flush_single);
        amd_iommu_stats_add(&domain_flush_all);
+       amd_iommu_stats_add(&alloced_io_mem);
 }
 
 #endif
@@ -1246,6 +1248,8 @@ static dma_addr_t __map_single(struct device *dev,
        }
        address += offset;
 
+       ADD_STATS_COUNTER(alloced_io_mem, size);
+
        if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) {
                iommu_flush_tlb(iommu, dma_dom->domain.id);
                dma_dom->need_flush = false;
@@ -1282,6 +1286,8 @@ static void __unmap_single(struct amd_iommu *iommu,
                start += PAGE_SIZE;
        }
 
+       SUB_STATS_COUNTER(alloced_io_mem, size);
+
        dma_ops_free_addresses(dma_dom, dma_addr, pages);
 
        if (amd_iommu_unmap_flush || dma_dom->need_flush) {