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AMD IOMMU: add stats counter for unmap_single requests

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Impact: see number of unmap_single requests in debugfs

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2008-12-12 15:07:12 +01:00
parent 0f2a86f200
commit 146a6917fc
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kernel/amd_iommu.c
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@ -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 */