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Subject[PATCH] modify the IO_TLB_SEGSIZE to configtable as flexible requirement about IOMMU/SW-IOMMU.
Date
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


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