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| author | Joerg Roedel <joerg.roedel@amd.com> | 2008-12-12 16:59:58 +0300 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2009-01-03 16:11:58 +0300 |
| commit | da49f6df726ecaaee87757e8b65a560679d32f99 (patch) | |
| tree | e17afeec5a4f7aabaf7754288bfba9caafa0d13e /arch | |
| parent | 7f26508bbb76ce86aad1130ef6b7f1a4bb7de0c2 (diff) | |
| download | linux-da49f6df726ecaaee87757e8b65a560679d32f99.tar.xz | |
AMD IOMMU: add stats counter for completion wait events
Impact: see number of completion wait events in debugfs
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/amd_iommu.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index f98f70626bc6..b21435748e0d 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -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 */ |