linux-kernel - [PATCH 21/22] AMD IOMMU: add statistics about allocated io memory

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Date:	Mon, 15 Dec 2008 15:18:04 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
CC:	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 21/22] AMD IOMMU: add statistics about allocated io memory

Impact: see amount of allocated io memory in debugfs

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kernel/amd_iommu.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index be6d107..9c34902 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -73,6 +73,7 @@ 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;
@@ -109,6 +110,7 @@ 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
@@ -1245,6 +1247,8 @@ 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;
@@ -1281,6 +1285,8 @@ 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) {
-- 
1.5.6.4


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