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AMD IOMMU: add stats counter for map_single requests 

Impact: see number of map_single requests in debugfs

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
hifive-unleashed-5.1
Joerg Roedel 2008-12-12 15:05:16 +01:00
parent da49f6df72
commit 0f2a86f200
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kernel/amd_iommu.c
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@ -65,6 +65,7 @@ static struct dma_ops_domain *find_protection_domain(u16 devid);
*/
DECLARE_STATS_COUNTER(compl_wait);
DECLARE_STATS_COUNTER(cnt_map_single);
static struct dentry *stats_dir;
static struct dentry *de_isolate;
@ -92,6 +93,7 @@ static void amd_iommu_stats_init(void)
(u32 *)&amd_iommu_unmap_flush);
amd_iommu_stats_add(&compl_wait);
amd_iommu_stats_add(&cnt_map_single);
}
#endif
@ -1278,6 +1280,8 @@ static dma_addr_t map_single(struct device *dev, phys_addr_t paddr,
dma_addr_t addr;
u64 dma_mask;
INC_STATS_COUNTER(cnt_map_single);
if (!check_device(dev))
return bad_dma_address;