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Commit 146a6917 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

AMD IOMMU: add stats counter for unmap_single requests 



Impact: see number of unmap_single requests in debugfs

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 0f2a86f2

arch/x86/kernel/amd_iommu.c

+4 −0
Original line number Diff line number Diff line
@@ -66,6 +66,7 @@ static struct dma_ops_domain *find_protection_domain(u16 devid); 


DECLARE_STATS_COUNTER(compl_wait);

DECLARE_STATS_COUNTER(cnt_map_single);

DECLARE_STATS_COUNTER(cnt_unmap_single);



static struct dentry *stats_dir;

static struct dentry *de_isolate;
@@ -94,6 +95,7 @@ static void amd_iommu_stats_init(void) 


	amd_iommu_stats_add(&compl_wait);

	amd_iommu_stats_add(&cnt_map_single);

	amd_iommu_stats_add(&cnt_unmap_single);

}



#endif
@@ -1321,6 +1323,8 @@ static void unmap_single(struct device *dev, dma_addr_t dma_addr, 
	struct protection_domain *domain;

	u16 devid;



	INC_STATS_COUNTER(cnt_unmap_single);



	if (!check_device(dev) ||

	    !get_device_resources(dev, &iommu, &domain, &devid))

		/* device not handled by any AMD IOMMU */