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
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -74,6 +74,7 @@
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 @@
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 @@
}
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 @@
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) {