linux-kernel - [PATCH 11/22] AMD IOMMU: add stats counter for completion wait events

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Message-ID: <1229350685-3816-12-git-send-email-joerg.roedel@amd.com>
Date:	Mon, 15 Dec 2008 15:17:54 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
CC:	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 11/22] 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@....com>
---
 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 be1ddca..a494a98 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -63,6 +63,8 @@ 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;
@@ -87,6 +89,8 @@ 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
@@ -248,6 +252,8 @@ 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 */
-- 
1.5.6.4


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