* How to ensure that different peripherals getting different IOVA address in kernel? [not found] <5600AF72.2000106@hisilicon.com> @ 2015-09-23 1:55 ` chenfeng 0 siblings, 0 replies; 6+ messages in thread From: chenfeng @ 2015-09-23 1:55 UTC (permalink / raw) To: joro, iommu, linux-kernel, rcallicotte, robin.murphy, jiang.liu Cc: Dan zhao, qijiwen, Peter Panshilin, Suzhuangluan, Yiping Xu, Wangfei (William, Euler) Hi all, In IOMMU architecture , how to make two different peripherals share the same page table ? In other words , is there a mechanism or structure to make two peripherals get completely different address. eg: peri-A、peri-B and peri-C share the same iova address 0-1G for some performance requests. So the A,B,C need to use the same IOVA generator to ensure this,but I don't find an architecture to make this. Any help will be appreciated. Puck ^ permalink raw reply [flat|nested] 6+ messages in thread
* How to ensure that different peripherals getting different IOVA address in kernel? @ 2015-09-23 1:55 ` chenfeng 0 siblings, 0 replies; 6+ messages in thread From: chenfeng @ 2015-09-23 1:55 UTC (permalink / raw) To: joro, iommu, linux-kernel, rcallicotte, robin.murphy, jiang.liu Cc: Dan zhao, qijiwen, Peter Panshilin, Suzhuangluan, Yiping Xu, Wangfei (William, Euler) Hi all, In IOMMU architecture , how to make two different peripherals share the same page table ? In other words , is there a mechanism or structure to make two peripherals get completely different address. eg: peri-A、peri-B and peri-C share the same iova address 0-1G for some performance requests. So the A,B,C need to use the same IOVA generator to ensure this,but I don't find an architecture to make this. Any help will be appreciated. Puck ^ permalink raw reply [flat|nested] 6+ messages in thread
[parent not found: <560206AE.4020608-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>]
* Re: How to ensure that different peripherals getting different IOVA address in kernel? 2015-09-23 1:55 ` chenfeng @ 2015-09-23 2:42 ` Jiang Liu -1 siblings, 0 replies; 6+ messages in thread From: Jiang Liu @ 2015-09-23 2:42 UTC (permalink / raw) To: chenfeng, joro-zLv9SwRftAIdnm+yROfE0A, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA, linux-kernel-u79uwXL29TY76Z2rM5mHXA, rcallicotte-Re5JQEeQqe8AvxtiuMwx3w, robin.murphy-5wv7dgnIgG8 Cc: Dan zhao, Wangfei (William, Euler), Suzhuangluan, qijiwen, Peter Panshilin On 2015/9/23 9:55, chenfeng wrote: > Hi all, > > In IOMMU architecture , how to make two different peripherals share the same page table ? > > In other words , is there a mechanism or structure to make two peripherals get completely different address. > > eg: > > peri-A、peri-B and peri-C share the same iova address 0-1G for some performance requests. > > So the A,B,C need to use the same IOVA generator to ensure this,but I don't find an architecture to make this. > > Any help will be appreciated. Hi Chenfeng, Seems IOMMU group may help you, please take a look at Documentation/vfio.txt. Thanks! Gerry _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: How to ensure that different peripherals getting different IOVA address in kernel? @ 2015-09-23 2:42 ` Jiang Liu 0 siblings, 0 replies; 6+ messages in thread From: Jiang Liu @ 2015-09-23 2:42 UTC (permalink / raw) To: chenfeng, joro, iommu, linux-kernel, rcallicotte, robin.murphy Cc: Dan zhao, qijiwen, Peter Panshilin, Suzhuangluan, Yiping Xu, Wangfei (William, Euler) On 2015/9/23 9:55, chenfeng wrote: > Hi all, > > In IOMMU architecture , how to make two different peripherals share the same page table ? > > In other words , is there a mechanism or structure to make two peripherals get completely different address. > > eg: > > peri-A、peri-B and peri-C share the same iova address 0-1G for some performance requests. > > So the A,B,C need to use the same IOVA generator to ensure this,but I don't find an architecture to make this. > > Any help will be appreciated. Hi Chenfeng, Seems IOMMU group may help you, please take a look at Documentation/vfio.txt. Thanks! Gerry ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: How to ensure that different peripherals getting different IOVA address in kernel? 2015-09-23 1:55 ` chenfeng @ 2015-09-23 12:08 ` Robin Murphy -1 siblings, 0 replies; 6+ messages in thread From: Robin Murphy @ 2015-09-23 12:08 UTC (permalink / raw) To: chenfeng, joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, rcallicotte-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, jiang.liu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org Cc: Dan zhao, Wangfei (William, Euler), Suzhuangluan, qijiwen, Peter Panshilin On 23/09/15 02:55, chenfeng wrote: > Hi all, > > In IOMMU architecture , how to make two different peripherals share the same page table ? > > In other words , is there a mechanism or structure to make two peripherals get completely different address. > > eg: > > peri-A、peri-B and peri-C share the same iova address 0-1G for some performance requests. > > So the A,B,C need to use the same IOVA generator to ensure this,but I don't find an architecture to make this. This is what IOMMU domains are all about: devices in one domain are isolated from devices in different domains, so all you need to do is make sure all devices that want to share buffers are attached to the same domain, then they will all share that domain's IOVA space. Robin. > > Any help will be appreciated. > > Puck > > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: How to ensure that different peripherals getting different IOVA address in kernel? @ 2015-09-23 12:08 ` Robin Murphy 0 siblings, 0 replies; 6+ messages in thread From: Robin Murphy @ 2015-09-23 12:08 UTC (permalink / raw) To: chenfeng, joro@8bytes.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, rcallicotte@gmail.com, jiang.liu@linux.intel.com Cc: Dan zhao, qijiwen, Peter Panshilin, Suzhuangluan, Yiping Xu, Wangfei (William, Euler) On 23/09/15 02:55, chenfeng wrote: > Hi all, > > In IOMMU architecture , how to make two different peripherals share the same page table ? > > In other words , is there a mechanism or structure to make two peripherals get completely different address. > > eg: > > peri-A、peri-B and peri-C share the same iova address 0-1G for some performance requests. > > So the A,B,C need to use the same IOVA generator to ensure this,but I don't find an architecture to make this. This is what IOMMU domains are all about: devices in one domain are isolated from devices in different domains, so all you need to do is make sure all devices that want to share buffers are attached to the same domain, then they will all share that domain's IOVA space. Robin. > > Any help will be appreciated. > > Puck > > ^ permalink raw reply [flat|nested] 6+ messages in thread
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2015-09-23 1:55 ` How to ensure that different peripherals getting different IOVA address in kernel? chenfeng
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2015-09-23 2:42 ` Jiang Liu
2015-09-23 12:08 ` Robin Murphy
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