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Message-ID: <58413F0E.3030604@huawei.com>
Date: Fri, 2 Dec 2016 17:29:50 +0800
From: "majun (Euler7)" <majun258@...wei.com>
To: Marc Zyngier <marc.zyngier@....com>,
<linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
<robert.moore@...el.com>, <lenb@...nel.org>, <lv.zheng@...el.com>,
<rafael.j.wysocki@...el.com>, <devel@...ica.org>,
<mark.rutland@....com>, <robh+dt@...nel.org>,
<jason@...edaemon.net>
CC: <majun258@...wei.com>, <dingtianhong@...wei.com>,
<guohanjun@...wei.com>
Subject: Re: [RFC PATCH 0/3] Add a new flag for ITS device to control indirect
route
在 2016/12/1 17:07, Marc Zyngier 写道:
> On 01/12/16 07:45, Majun wrote:
>> From: MaJun <majun258@...wei.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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