linux-kernel - Re: [PATCH v16 3/6] soc: qcom: rpmh: Invalidate SLEEP and WAKE TCSes before flushing new data

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Date:   Sun, 12 Apr 2020 18:55:22 +0530
From:   Maulik Shah <mkshah@...eaurora.org>
To:     Stephen Boyd <swboyd@...omium.org>, bjorn.andersson@...aro.org,
        dianders@...omium.org, evgreen@...omium.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        agross@...nel.org, mka@...omium.org, rnayak@...eaurora.org,
        ilina@...eaurora.org, lsrao@...eaurora.org
Subject: Re: [PATCH v16 3/6] soc: qcom: rpmh: Invalidate SLEEP and WAKE TCSes
 before flushing new data

Hi,

On 4/10/2020 1:53 AM, Stephen Boyd wrote:
> Quoting Maulik Shah (2020-04-05 23:32:18)
>> TCSes have previously programmed data when rpmh_flush is called.
> rpmh_flush()
Ok, i will update in v17.
>
>> This can cause old data to trigger along with newly flushed.
>>
>> Fix this by cleaning SLEEP and WAKE TCSes before new data is flushed.
>>
>> With this there is no need to invoke rpmh_rsc_invalidate() call from
>> rpmh_invalidate().
>>
>> Simplify rpmh_invalidate() by moving invalidate_batch() inside.
>>
>> Fixes: 600513dfeef3 ("drivers: qcom: rpmh: cache sleep/wake state requests")
>> Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
>> Reviewed-by: Douglas Anderson <dianders@...omium.org>
>> ---
>>   drivers/soc/qcom/rpmh.c | 41 ++++++++++++++++++-----------------------
>>   1 file changed, 18 insertions(+), 23 deletions(-)
>>
>> diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
>> index 03630ae..a75f3df 100644
>> --- a/drivers/soc/qcom/rpmh.c
>> +++ b/drivers/soc/qcom/rpmh.c
>> @@ -498,24 +492,25 @@ int rpmh_flush(struct rpmh_ctrlr *ctrlr)
>>   }
>>   
>>   /**
>> - * rpmh_invalidate: Invalidate all sleep and active sets
>> - * sets.
>> + * rpmh_invalidate: Invalidate sleep and wake sets in batch_cache
>>    *
>>    * @dev: The device making the request
>>    *
>> - * Invalidate the sleep and active values in the TCS blocks.
>> + * Invalidate the sleep and wake values in batch_cache.
>>    */
>>   int rpmh_invalidate(const struct device *dev)
>>   {
>>          struct rpmh_ctrlr *ctrlr = get_rpmh_ctrlr(dev);
>> -       int ret;
>> -
>> -       invalidate_batch(ctrlr);
>> +       struct batch_cache_req *req, *tmp;
>> +       unsigned long flags;
>>   
>> -       do {
>> -               ret = rpmh_rsc_invalidate(ctrlr_to_drv(ctrlr));
>> -       } while (ret == -EAGAIN);
>> +       spin_lock_irqsave(&ctrlr->cache_lock, flags);
>> +       list_for_each_entry_safe(req, tmp, &ctrlr->batch_cache, list)
>> +               kfree(req);
>> +       INIT_LIST_HEAD(&ctrlr->batch_cache);
>> +       ctrlr->dirty = true;
>> +       spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
>>   
>> -       return ret;
>> +       return 0;
> Now this always returns 0. Maybe it should become a void function, but
> doing that requires a change in the interconnect code so maybe do it
> later.

Sure i will add in my To-Do list.

Thanks,
Maulik

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