linux-kernel - Re: [PATCH 1/1] iommu/amd: Use delayed mmu release notifier

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Date:	Fri, 7 Nov 2014 22:22:14 +0200
From:	Oded Gabbay <oded.gabbay@....com>
To:	Joerg Roedel <joro@...tes.org>
CC:	<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] iommu/amd: Use delayed mmu release notifier



On 11/06/2014 03:33 PM, Joerg Roedel wrote:
> On Sat, Oct 18, 2014 at 12:43:27AM +0300, Oded Gabbay wrote:
>> 3. Later, amdkfd's mmu notifier callback (kfd_process_notifier_release()) gets
>>    called and releases more things that are related to the process.
>>    In that function, amd_iommu_unbind_pasid() is explicitly called.
> 
> Can't you just register a delayed funtion in
> kfd_process_notifier_release() and call amd_iommu_unbind_pasid() from
> there? 
OK, I implemented that and I don't need to change the IOMMUv2 code anymore.
So, I think we can conclude this discussion at this point :)

	Oded

I really hate to make that part of the IOMMUv2 driver API,
> especially since it is going to be turned into a generic IOMMU-API
> extension.
> 
> And especially since all these hacks could be avoided if the KFD driver
> would just turn down everything on closing the file descriptor.
> 
> 
> 	Joerg
> 
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