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Subject[PATCH 13/22] AMD IOMMU: add stats counter for unmap_single requests
Date
Impact: see number of unmap_single 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 4b23879..18f26eb 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -65,6 +65,7 @@ static struct dma_ops_domain *find_protection_domain(u16 devid);

DECLARE_STATS_COUNTER(compl_wait);
DECLARE_STATS_COUNTER(cnt_map_single);
+DECLARE_STATS_COUNTER(cnt_unmap_single);

static struct dentry *stats_dir;
static struct dentry *de_isolate;
@@ -93,6 +94,7 @@ static void amd_iommu_stats_init(void)

amd_iommu_stats_add(&compl_wait);
amd_iommu_stats_add(&cnt_map_single);
+ amd_iommu_stats_add(&cnt_unmap_single);
}

#endif
@@ -1320,6 +1322,8 @@ static void unmap_single(struct device *dev, dma_addr_t dma_addr,
struct protection_domain *domain;
u16 devid;

+ INC_STATS_COUNTER(cnt_unmap_single);
+
if (!check_device(dev) ||
!get_device_resources(dev, &iommu, &domain, &devid))
/* device not handled by any AMD IOMMU */
--
1.5.6.4



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