From: "xuqiang (M)" <xuqiang36@huawei.com>
To: Marc Zyngier <maz@kernel.org>
Cc: <tglx@linutronix.de>, <linux-kernel@vger.kernel.org>,
<rui.xiang@huawei.com>
Subject: Re: [PATCH -next] irq-chip/gic-v3-its: Fixed an issue where the ITS executes the residual commands in the queue again when the ITS wakes up from sleep mode.
Date: Tue, 10 Nov 2020 17:09:00 +0800 [thread overview]
Message-ID: <96243568-01ad-31c2-e927-6b85738c9bc3@huawei.com> (raw)
In-Reply-To: <338d65dfeac0cc026c74d9e78ec6f0c1@kernel.org>
在 2020/11/9 18:43, Marc Zyngier 写道:
> On 2020-11-09 03:05, xuqiang (M) wrote:
>> 在 2020/11/8 0:54, Marc Zyngier 写道:
>>> [dropping Jason, whose email address has been bouncing for weeks now]
>>>
>>> On 2020-11-07 10:42, Xu Qiang wrote:
>>>> On my platform, ITS_FLAGS_SAVE_SUSPEND_STATE is not set,thus do
>>>> nothing
>>>
>>> Which platform?
>> Hisi Ascend platform
>>>
>>>> in its suspend and resuse function.On the other hand,firmware stores
>>>> GITS_CTRL,GITS_CBASER,GITS_CWRITER and GITS_BASER<n> in the suspend,
>>>> and restores these registers in the resume. As a result, the ITS
>>>> executes
>>>> the residual commands in the queue.
>>>
>>> Which firmware are you using? I just had a look at the trusted
>>> firmware source
>>> code, and while it definitely does something that *looks* like what
>>> you are
>>> describing, it doesn't re-enable the ITS on resume.
>>>
>>> So what are you running?
>>
>> I am using ATF. Since ITS_FLAGS_SAVE_SUSPEND_STATE is not set,ITS
>> driver of OS will
>>
>> not re-enable ITS in th resume. To make ITS work properly, we changed
>> the ATF code
>>
>> to re-enable ITS on resume.
>
> I don't think the words "work properly" apply here.
>
> The kernel didn't do what you wanted, so instead of fixing the kernel,
> you
> introduced a bug that results in memory corruption from the firmware.
>
> What are you plans to fix your firmware? Because from an upstream ATF
> compatibility PoV, all there is to do is to fixup the command queue and
> enable the ITS.
>
> M.
I'm sorry I didn't make it clear how to do this. I'm going to reset commit
which re-enable ITS on the ATF, and drop the checks for
ITS_FLAGS_SAVE_SUSPEND_STATE
in the OS.
In other words, the ATF does not re-enable ITS, and OS itself re-enables
ITS when it resumes.
To do this, I have to remove the check of ITS_FLAGS_SAVE_SUSPEND_STATE
because it is not set.
Thanks
Xu.
next prev parent reply other threads:[~2020-11-10 9:09 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-07 10:42 [PATCH -next] irq-chip/gic-v3-its: Fixed an issue where the ITS executes the residual commands in the queue again when the ITS wakes up from sleep mode Xu Qiang
2020-11-07 16:54 ` Marc Zyngier
2020-11-09 3:05 ` xuqiang (M)
2020-11-09 10:43 ` Marc Zyngier
2020-11-10 9:09 ` xuqiang (M) [this message]
2020-11-17 13:37 ` xuqiang (M)
2020-11-22 12:47 ` Marc Zyngier
2020-11-23 16:45 ` [irqchip: irq/irqchip-next] irqchip/gic-v3-its: Unconditionally save/restore the ITS state on suspend irqchip-bot for Xu Qiang
-- strict thread matches above, loose matches on Subject: below --
2020-11-03 8:11 [PATCH -next] irq-chip/gic-v3-its: Fixed an issue where the ITS executes the residual commands in the queue again when the ITS wakes up from sleep mode Xu Qiang
2020-11-03 18:19 ` Marc Zyngier
2020-11-05 11:54 ` xuqiang (M)
2020-11-05 13:12 ` Marc Zyngier
2020-11-05 14:06 ` xuqiang (M)
2020-11-05 14:24 ` Marc Zyngier
2020-11-06 10:05 ` xuqiang (M)
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