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Subject[PATCH 22/22] AMD IOMMU: add statistics about total number of map requests
Date
Impact: see total number of map requests in debugfs

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/amd_iommu.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 9c34902..c8d4301 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);
+DECLARE_STATS_COUNTER(total_map_requests);

static struct dentry *stats_dir;
static struct dentry *de_isolate;
@@ -111,6 +112,7 @@ 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
@@ -1228,6 +1230,8 @@ 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);

--
1.5.6.4



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