linux-kernel - [PATCH] swiotlb: add kernel error message to track iobtlb overflow buffer usage

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Date:	Fri, 31 Aug 2012 18:55:59 -0600
From:	Shuah Khan <shuah.khan@...com>
To:	fujita.tomonori@....ntt.co.jp, akpm@...ux-foundation.org,
	paul.gortmaker@...driver.com, bhelgaas@...gle.com,
	amwang@...hat.com, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	linux-kernel@...r.kernel.org, shuahkhan@...il.com
Subject: [PATCH] swiotlb: add kernel error message to track iobtlb overflow
 buffer usage

Add kernel error message to track iotlb overflow buffer triggers to understand
how often the overflow buffer gets used.

Signed-off-by: Shuah Khan <shuah.khan@...com>
---
 lib/swiotlb.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 45bc1f8..597d7b9 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -682,6 +682,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
 	if (!map) {
 		swiotlb_full(dev, size, dir, 1);
 		map = io_tlb_overflow_buffer;
+		dev_err(dev, "SWIOTLB is full. Mapping overflow buffer.\n");
 	}
 
 	dev_addr = swiotlb_virt_to_bus(dev, map);
-- 
1.7.9.5



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