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From: Maulik Shah <mkshah@codeaurora.org>
To: Doug Anderson <dianders@chromium.org>
Cc: Stephen Boyd <swboyd@chromium.org>,
	Evan Green <evgreen@chromium.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-arm-msm <linux-arm-msm@vger.kernel.org>,
	Andy Gross <agross@kernel.org>,
	Matthias Kaehlcke <mka@chromium.org>,
	Rajendra Nayak <rnayak@codeaurora.org>,
	Lina Iyer <ilina@codeaurora.org>,
	lsrao@codeaurora.org
Subject: Re: [PATCH v14 4/6] soc: qcom: rpmh: Invoke rpmh_flush() for dirty caches
Date: Tue, 31 Mar 2020 13:56:00 +0530	[thread overview]
Message-ID: <d76424f3-965e-abaa-9622-185eff94dfe9@codeaurora.org> (raw)
In-Reply-To: <CAD=FV=WEH_A4SvyX0uv9Z_n+z9_SYcdm2LfsLRK7qALEiOyHqQ@mail.gmail.com>

Hi,

On 3/27/2020 11:52 PM, Doug Anderson wrote:
> Hi,
>
> On Fri, Mar 27, 2020 at 4:00 AM Maulik Shah <mkshah@codeaurora.org> wrote:
>>    * @ctrlr: controller making request to flush cached data
>>    *
>> - * Return: -EBUSY if the controller is busy, probably waiting on a response
>> - * to a RPMH request sent earlier.
>> + * Return: 0 on success, error number otherwise.
>>    *
>> - * This function is always called from the sleep code from the last CPU
>> - * that is powering down the entire system. Since no other RPMH API would be
>> - * executing at this time, it is safe to run lockless.
>> + * This function can either be called from sleep code on the last CPU
>> + * (thus no spinlock needed) or with the ctrlr->cache_lock already held.
>>
>> Now you can remove the "or with the ctrlr->cache_lock already held"
>> since it's no longer true.
>>
>> It can be true for other RSCs, so i kept as it is.
> I don't really understand this.  The cache_lock is only a concept in
> "rpmh.c".  How could another RSC grab the cache lock?  If nothing
> else, can you remove this comment until support for those other RSCs
> are added and we can evaluate then?
>
> -Doug
Okay i will remove this comment until support for other RSCs are added.

Thanks,
Maulik

-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

  reply	other threads:[~2020-03-31  8:26 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-26 17:37 [PATCH v14 0/6] Invoke rpmh_flush for non OSI targets Maulik Shah
2020-03-26 17:37 ` [PATCH v14 1/6] arm64: dts: qcom: sc7180: Add cpuidle low power states Maulik Shah
2020-03-26 17:37 ` [PATCH v14 2/6] soc: qcom: rpmh: Update dirty flag only when data changes Maulik Shah
2020-03-26 17:37 ` [PATCH v14 3/6] soc: qcom: rpmh: Invalidate SLEEP and WAKE TCSes before flushing new data Maulik Shah
2020-03-26 18:31   ` Doug Anderson
2020-03-27  8:23     ` Maulik Shah
2020-03-26 17:37 ` [PATCH v14 4/6] soc: qcom: rpmh: Invoke rpmh_flush() for dirty caches Maulik Shah
2020-03-26 21:18   ` Doug Anderson
     [not found]     ` <7bd2c923-4003-a1c4-610f-548e79a94d35@codeaurora.org>
2020-03-27 18:22       ` Doug Anderson
2020-03-31  8:26         ` Maulik Shah [this message]
2020-03-26 17:37 ` [PATCH v14 5/6] soc: qcom: rpmh-rsc: Clear active mode configuration for wake TCS Maulik Shah
2020-03-26 18:20   ` Doug Anderson
2020-03-26 17:37 ` [PATCH v14 6/6] soc: qcom: rpmh-rsc: Allow using free WAKE TCS for active request Maulik Shah
2020-03-26 21:46   ` Doug Anderson
2020-03-27 12:04     ` Maulik Shah
2020-03-27 18:42       ` Doug Anderson
2020-03-31  8:57         ` Maulik Shah

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