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From: xiaomin1 <xiaoming.wang@intel.com>
To: konrad.wilk@oracle.com, akpm@linux-foundation.org,
	linux@horizon.com, lauraa@codeaurora.org,
	heiko.carstens@de.ibm.com, d.kasatkin@samsung.com,
	takahiro.akashi@linaro.org, chris@chris-wilson.co.uk,
	u.kleine-koenig@pengutronix.de, linux-kernel@vger.kernel.org
Cc: xiaomin1 <xiaoming.wang@intel.com>,
	Chuansheng Liu <chuansheng.liu@intel.com>,
	Zhang Dongxing <dongxing.zhang@intel.com>
Subject: [PATCH] modify the IO_TLB_SEGSIZE to configtable as flexible requirement about IOMMU/SW-IOMMU.
Date: Tue, 27 Jan 2015 03:30:21 +0800	[thread overview]
Message-ID: <1422300621-4453-1-git-send-email-xiaoming.wang@intel.com> (raw)

The maximum of SW-IOMMU is limited to 2^11*128 = 256K.
While in different platform and different requirements this seems improper.
So modify the IO_TLB_SEGSIZE to configtable is make sense.
Example:
If 1M bytes are requied. There has an error like.
[ 33.293120] DMA: Out of SW-IOMMU space for 1048576 bytes at device gadget

Signed-off-by: Chuansheng Liu <chuansheng.liu@intel.com>
Signed-off-by: Zhang Dongxing <dongxing.zhang@intel.com>
Signed-off-by: xiaomin1 <xiaoming.wang@intel.com>
---
 include/linux/swiotlb.h |    2 +-
 lib/Kconfig             |    4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index e7a018e..5ab10b9 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -14,7 +14,7 @@ extern int swiotlb_force;
  * must be a power of 2.  What is the appropriate value ?
  * The complexity of {map,unmap}_single is linearly dependent on this value.
  */
-#define IO_TLB_SEGSIZE	128
+#define IO_TLB_SEGSIZE	CONFIG_DEFAULT_IO_TLB_SEGSIZE
 
 /*
  * log of the size of each IO TLB slab.  The number of slabs is command line
diff --git a/lib/Kconfig b/lib/Kconfig
index 54cf309..76f1108 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -518,4 +518,8 @@ source "lib/fonts/Kconfig"
 config ARCH_HAS_SG_CHAIN
 	def_bool n
 
+config DEFAULT_IO_TLB_SEGSIZE
+	int
+	default 128
+
 endmenu
-- 
1.7.9.5


             reply	other threads:[~2015-01-26  3:35 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-26 19:30 xiaomin1 [this message]
2015-01-26 11:15 ` Paul Bolle

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