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Re: [RFC PATCH 0/3] Add a new flag for ITS device to control indirect route

From "majun (Euler7)" <majun258@huawei.com>
Newsgroups linux.kernel
Subject Re: [RFC PATCH 0/3] Add a new flag for ITS device to control indirect route
Date 2016-12-02 10:40 +0100
Message-ID <sJStY-22N-11@gated-at.bofh.it> (permalink)
References <sJuhX-PI-7@gated-at.bofh.it> <sJvxn-1QI-15@gated-at.bofh.it>
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在 2016/12/1 17:07, Marc Zyngier 写道:
> On 01/12/16 07:45, Majun wrote:
>> From: MaJun <majun258@huawei.com>
>>
>> For current ITS driver, two level table (indirect route) is enabled when the memory used
>> for LPI route table over the limit(64KB * 2) size. But this function impact the 
>> performance of LPI interrupt actually because need more time to look up the table.
> 
> Are you implying that your ITS doesn't have a cache to lookup the most
> active devices, hence performing a full lookup on each interrupt?

Our ITS chip has the cache with depth 64. But this seems not enough for some
scenario,espeically on virtulization platform.
> 
> Anyway, doing this as a DT quirk doesn't feel right. Please use the ITS
> quirk infrastructure.

If there is no other better solutions, I will do this.

Thanks!
Majun



> 
> Thanks,
> 
> 	M.
>

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Thread

[RFC PATCH 0/3] Add a new flag for ITS device to control indirect route Majun <majun258@huawei.com> - 2016-12-01 08:50 +0100
  Re: [RFC PATCH 0/3] Add a new flag for ITS device to control indirect  route Marc Zyngier <marc.zyngier@arm.com> - 2016-12-01 10:10 +0100
    Re: [RFC PATCH 0/3] Add a new flag for ITS device to control indirect  route "majun (Euler7)" <majun258@huawei.com> - 2016-12-02 10:40 +0100
      Re: [RFC PATCH 0/3] Add a new flag for ITS device to control indirect  route Marc Zyngier <marc.zyngier@arm.com> - 2016-12-02 10:40 +0100
        Re: [RFC PATCH 0/3] Add a new flag for ITS device to control indirect  route "majun (Euler7)" <majun258@huawei.com> - 2016-12-05 04:20 +0100
          Re: [RFC PATCH 0/3] Add a new flag for ITS device to control indirect  route Marc Zyngier <marc.zyngier@arm.com> - 2016-12-05 10:20 +0100

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