From: Maulik Shah <mkshah@codeaurora.org>
To: Stephen Boyd <swboyd@chromium.org>,
bjorn.andersson@linaro.org, dianders@chromium.org,
evgreen@chromium.org
Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
agross@kernel.org, mka@chromium.org, rnayak@codeaurora.org,
ilina@codeaurora.org, lsrao@codeaurora.org
Subject: Re: [PATCH v16 4/6] soc: qcom: rpmh: Invoke rpmh_flush() for dirty caches
Date: Wed, 8 Apr 2020 12:38:48 +0530 [thread overview]
Message-ID: <8553ce0f-6dda-b0e0-d67a-f76ce3c0f945@codeaurora.org> (raw)
In-Reply-To: <158631424318.216820.1843109743502322053@swboyd.mtv.corp.google.com>
Hi,
On 4/8/2020 8:20 AM, Stephen Boyd wrote:
> Quoting Maulik Shah (2020-04-05 23:32:19)
>> Add changes to invoke rpmh flush() from CPU PM notification.
>> This is done when the last the cpu is entering power collapse and
>> controller is not busy.
>>
>> Controllers that do have 'HW solver' mode do not need to register
> Controllers that have 'HW solver' mode don't need to register? The 'do
> have' is throwing me off.
Okay i will remove 'do' from this line.
>> for CPU PM notification. They may be in autonomous mode executing
>> low power mode and do not require rpmh_flush() to happen from CPU
>> PM notification.
>>
>> Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
>> Reviewed-by: Douglas Anderson <dianders@chromium.org>
>> ---
>> drivers/soc/qcom/rpmh-internal.h | 25 +++++---
>> drivers/soc/qcom/rpmh-rsc.c | 123 +++++++++++++++++++++++++++++++++++----
>> drivers/soc/qcom/rpmh.c | 26 +++------
>> 3 files changed, 137 insertions(+), 37 deletions(-)
>>
>> diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
>> index b718221..fbe1f3e 100644
>> --- a/drivers/soc/qcom/rpmh-rsc.c
>> +++ b/drivers/soc/qcom/rpmh-rsc.c
>> @@ -6,6 +6,7 @@
> [...]
>> +
>> +static int rpmh_rsc_cpu_pm_callback(struct notifier_block *nfb,
>> + unsigned long action, void *v)
>> +{
>> + struct rsc_drv *drv = container_of(nfb, struct rsc_drv, rsc_pm);
>> + int ret = NOTIFY_OK;
>> +
>> + spin_lock(&drv->pm_lock);
>> +
>> + switch (action) {
>> + case CPU_PM_ENTER:
> I thought CPU_PM notifiers weren't supposed to be used anymore? Or at
> least, the genpd work that has gone on for cpuidle could be used here in
> place of CPU_PM notifiers?
genpd was used in v3 and v4 of this series, where from pd's .power_off
function, rpmh_flush() was invoked.
genpd can be useful if target firmware supports PSCI's OSI mode, while
sc7180 is non-OSI target.
The current approch (using cpu pm notification) can be used for both OSI
and non-OSI targets to invoke rpmh_flush() when last cpu goes to power down.
> And so this isn't actually any different
> than what was proposed originally to use genpd for this?
>
>> + cpumask_set_cpu(raw_smp_processor_id(),
> Why do we need to use raw_smp_processor_id()? smp_processor_id() should
> work just as well?
Yes, seems it will work as well. I will change to use smp_processor_id().
>
>> + &drv->cpus_entered_pm);
>> +
>> + if (!cpumask_equal(&drv->cpus_entered_pm, cpu_online_mask))
>> + goto exit;
>> + break;
>> + case CPU_PM_ENTER_FAILED:
>> + case CPU_PM_EXIT:
>> + cpumask_clear_cpu(raw_smp_processor_id(),
>> + &drv->cpus_entered_pm);
>> + goto exit;
>> + }
>> +
>> + ret = rpmh_rsc_ctrlr_is_busy(drv);
>> + if (ret) {
>> + ret = NOTIFY_BAD;
>> + goto exit;
>> + }
>> +
>> + ret = rpmh_flush(&drv->client);
>> + if (ret)
>> + ret = NOTIFY_BAD;
>> + else
>> + ret = NOTIFY_OK;
>> +
>> +exit:
>> + spin_unlock(&drv->pm_lock);
>> + return ret;
>> +}
>> +
Thanks,
Maulik
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
next prev parent reply other threads:[~2020-04-08 7:09 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-06 6:32 [PATCH v16 0/6] Invoke rpmh_flush for non OSI targets Maulik Shah
2020-04-06 6:32 ` [PATCH v16 1/6] arm64: dts: qcom: sc7180: Add cpuidle low power states Maulik Shah
2020-04-06 6:32 ` [PATCH v16 2/6] soc: qcom: rpmh: Update dirty flag only when data changes Maulik Shah
2020-04-06 6:32 ` [PATCH v16 3/6] soc: qcom: rpmh: Invalidate SLEEP and WAKE TCSes before flushing new data Maulik Shah
2020-04-09 20:23 ` Stephen Boyd
2020-04-12 13:25 ` Maulik Shah
2020-04-06 6:32 ` [PATCH v16 4/6] soc: qcom: rpmh: Invoke rpmh_flush() for dirty caches Maulik Shah
2020-04-08 2:50 ` Stephen Boyd
2020-04-08 7:08 ` Maulik Shah [this message]
2020-04-09 8:16 ` Stephen Boyd
2020-04-12 13:51 ` Maulik Shah
2020-04-10 4:15 ` Stephen Boyd
2020-04-10 14:52 ` Doug Anderson
2020-04-12 14:10 ` Maulik Shah
2020-04-12 14:04 ` Maulik Shah
2020-04-06 6:32 ` [PATCH v16 5/6] soc: qcom: rpmh-rsc: Clear active mode configuration for wake TCS Maulik Shah
2020-04-06 6:32 ` [PATCH v16 6/6] soc: qcom: rpmh-rsc: Allow using free WAKE TCS for active request Maulik Shah
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