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AMD IOMMU: add stats counter for completion wait events

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Impact: see number of completion wait events in debugfs

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2008-12-12 14:59:58 +01:00
parent 7f26508bbb
commit da49f6df72
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kernel/amd_iommu.c
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@ -64,6 +64,8 @@ static struct dma_ops_domain *find_protection_domain(u16 devid);
* Initialization code for statistics collection
*/
DECLARE_STATS_COUNTER(compl_wait);
static struct dentry *stats_dir;
static struct dentry *de_isolate;
static struct dentry *de_fflush;
@ -88,6 +90,8 @@ static void amd_iommu_stats_init(void)
de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir,
(u32 *)&amd_iommu_unmap_flush);
amd_iommu_stats_add(&compl_wait);
}
#endif
@ -249,6 +253,8 @@ static void __iommu_wait_for_completion(struct amd_iommu *iommu)
unsigned status = 0;
unsigned long i = 0;
INC_STATS_COUNTER(compl_wait);
while (!ready && (i < EXIT_LOOP_COUNT)) {
++i;
/* wait for the bit to become one */