On 06/02/15 00:10, Wang, Xiaoming wrote:

quoted

-----Original Message-----
From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@oracle.com]
Sent: Friday, February 6, 2015 3:33 AM
To: Wang, Xiaoming
Cc: ralf@linux-mips.org; boris.ostrovsky@oracle.com;
david.vrabel@citrix.com; linux-mips@linux-mips.org; linux-
kernel@vger.kernel.org; xen-devel@lists.xenproject.org; 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; pebolle@tiscali.nl; Liu,
Chuansheng; Zhang, Dongxing
Subject: Re: [PATCH] modify the IO_TLB_SEGSIZE to io_tlb_segsize
configurable as flexible requirement about SW-IOMMU.

On Fri, Feb 06, 2015 at 07:01:14AM +0800, xiaomin1 wrote:

quoted

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 io_tlb_segsize as configurable is make

sense.

More details please. What is the issue you are hitting?

Example:
If 1M bytes are requied. There has an error like.

Instead of allowing the bouncing of such large buffers, could the gadget
driver be modified to submit the buffers to the hardware in smaller chunks?

David