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Commit 8ecaf8f1 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

AMD IOMMU: add statistics about total number of map requests 



Impact: see total number of map requests in debugfs

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 5774f7c5

arch/x86/kernel/amd_iommu.c

+4 −0
Original line number Diff line number Diff line
@@ -75,6 +75,7 @@ DECLARE_STATS_COUNTER(cross_page); 
DECLARE_STATS_COUNTER(domain_flush_single);

DECLARE_STATS_COUNTER(domain_flush_all);

DECLARE_STATS_COUNTER(alloced_io_mem);

DECLARE_STATS_COUNTER(total_map_requests);



static struct dentry *stats_dir;

static struct dentry *de_isolate;
@@ -112,6 +113,7 @@ static void amd_iommu_stats_init(void) 
	amd_iommu_stats_add(&domain_flush_single);

	amd_iommu_stats_add(&domain_flush_all);

	amd_iommu_stats_add(&alloced_io_mem);

	amd_iommu_stats_add(&total_map_requests);

}



#endif
@@ -1229,6 +1231,8 @@ static dma_addr_t __map_single(struct device *dev, 
	pages = iommu_num_pages(paddr, size, PAGE_SIZE);

	paddr &= PAGE_MASK;



	INC_STATS_COUNTER(total_map_requests);



	if (pages > 1)

		INC_STATS_COUNTER(cross_page);