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authorJoerg Roedel <joerg.roedel@amd.com>2008-12-12 15:05:16 +0100
committerJoerg Roedel <joerg.roedel@amd.com>2009-01-03 14:11:59 +0100
commit0f2a86f200bc97ae6cefc5d3ac879094b3fcde48 (patch)
treea1ae52873ab4bcda1e9db4cb1f0ff67450832d31
parentda49f6df726ecaaee87757e8b65a560679d32f99 (diff)
AMD IOMMU: add stats counter for map_single requests
Impact: see number of map_single requests in debugfs Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
-rw-r--r--arch/x86/kernel/amd_iommu.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index b21435748e0..ef377865eb7 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);
static struct dentry *stats_dir;
static struct dentry *de_isolate;
@@ -92,6 +93,7 @@ static void amd_iommu_stats_init(void)
(u32 *)&amd_iommu_unmap_flush);
amd_iommu_stats_add(&compl_wait);
+ amd_iommu_stats_add(&cnt_map_single);
}
#endif
@@ -1278,6 +1280,8 @@ static dma_addr_t map_single(struct device *dev, phys_addr_t paddr,
dma_addr_t addr;
u64 dma_mask;
+ INC_STATS_COUNTER(cnt_map_single);
+
if (!check_device(dev))
return bad_dma_address;