aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJoerg Roedel <joerg.roedel@amd.com>2008-12-12 15:42:39 +0100
committerJoerg Roedel <joerg.roedel@amd.com>2009-01-03 14:11:59 +0100
commitc1858976f5ef05122bb671f678beaf7e1fe1dd74 (patch)
tree7476166c4dc3851055d9297f51f956f3e3db3bca
parent5d31ee7e08b7713596b999a42e67491bdf3665b3 (diff)
downloadlinux-stericsson-c1858976f5ef05122bb671f678beaf7e1fe1dd74.tar.gz
AMD IOMMU: add stats counter for cross-page request
Impact: see number of requests for more than one page in debugfs Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
-rw-r--r--arch/x86/kernel/amd_iommu.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 112412d733ab..f5455039b609 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -71,6 +71,7 @@ DECLARE_STATS_COUNTER(cnt_map_sg);
DECLARE_STATS_COUNTER(cnt_unmap_sg);
DECLARE_STATS_COUNTER(cnt_alloc_coherent);
DECLARE_STATS_COUNTER(cnt_free_coherent);
+DECLARE_STATS_COUNTER(cross_page);
static struct dentry *stats_dir;
static struct dentry *de_isolate;
@@ -104,6 +105,7 @@ static void amd_iommu_stats_init(void)
amd_iommu_stats_add(&cnt_unmap_sg);
amd_iommu_stats_add(&cnt_alloc_coherent);
amd_iommu_stats_add(&cnt_free_coherent);
+ amd_iommu_stats_add(&cross_page);
}
#endif
@@ -1217,6 +1219,9 @@ static dma_addr_t __map_single(struct device *dev,
pages = iommu_num_pages(paddr, size, PAGE_SIZE);
paddr &= PAGE_MASK;
+ if (pages > 1)
+ INC_STATS_COUNTER(cross_page);
+
if (align)
align_mask = (1UL << get_order(size)) - 1;