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AMD IOMMU: add stats counter for cross-page request

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Impact: see number of requests for more than one page in debugfs

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2008-12-12 15:42:39 +01:00
parent 5d31ee7e08
commit c1858976f5
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kernel/amd_iommu.c
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@ -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;