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Commit c1858976 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

AMD IOMMU: add stats counter for cross-page request 



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

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 5d31ee7e

arch/x86/kernel/amd_iommu.c

+5 −0
Original line number Diff line number Diff line
@@ -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;