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From: Srinivas Rao L <lsrao@codeaurora.org>
To: Maulik Shah <mkshah@codeaurora.org>,
	swboyd@chromium.org, mka@chromium.org, evgreen@chromium.org,
	bjorn.andersson@linaro.org
Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	agross@kernel.org, dianders@chromium.org, rnayak@codeaurora.org,
	ilina@codeaurora.org
Subject: Re: [PATCH v6 2/3] soc: qcom: rpmh: Update dirty flag only when data changes
Date: Mon, 24 Feb 2020 12:13:39 +0530	[thread overview]
Message-ID: <2c25c10d-6e52-4b59-00f8-fb5538a7e5a4@codeaurora.org> (raw)
In-Reply-To: <1582277527-19638-3-git-send-email-mkshah@codeaurora.org>

Reviewed-by: Srinivas Rao L <lsrao@codeaurora.org>

Regards,
Srinivas.

On 2/21/2020 3:02 PM, Maulik Shah wrote:
> Currently rpmh ctrlr dirty flag is set for all cases regardless
> of data is really changed or not. Add changes to update it when
> data is updated to newer values.
>
> Also move dirty flag updates to happen from within cache_lock.
>
> Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
> ---
>   drivers/soc/qcom/rpmh.c | 21 ++++++++++++++++-----
>   1 file changed, 16 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
> index eb0ded0..83ba4e0 100644
> --- a/drivers/soc/qcom/rpmh.c
> +++ b/drivers/soc/qcom/rpmh.c
> @@ -139,20 +139,27 @@ static struct cache_req *cache_rpm_request(struct rpmh_ctrlr *ctrlr,
>   existing:
>   	switch (state) {
>   	case RPMH_ACTIVE_ONLY_STATE:
> -		if (req->sleep_val != UINT_MAX)
> +		if (req->sleep_val != UINT_MAX) {
>   			req->wake_val = cmd->data;
> +			ctrlr->dirty = true;
> +		}
>   		break;
>   	case RPMH_WAKE_ONLY_STATE:
> -		req->wake_val = cmd->data;
> +		if (req->wake_val != cmd->data) {
> +			req->wake_val = cmd->data;
> +			ctrlr->dirty = true;
> +		}
>   		break;
>   	case RPMH_SLEEP_STATE:
> -		req->sleep_val = cmd->data;
> +		if (req->sleep_val != cmd->data) {
> +			req->sleep_val = cmd->data;
> +			ctrlr->dirty = true;
> +		}
>   		break;
>   	default:
>   		break;
>   	}
>   
> -	ctrlr->dirty = true;
>   unlock:
>   	spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
>   
> @@ -287,6 +294,7 @@ static void cache_batch(struct rpmh_ctrlr *ctrlr, struct batch_cache_req *req)
>   
>   	spin_lock_irqsave(&ctrlr->cache_lock, flags);
>   	list_add_tail(&req->list, &ctrlr->batch_cache);
> +	ctrlr->dirty = true;
>   	spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
>   }
>   
> @@ -323,6 +331,7 @@ static void invalidate_batch(struct rpmh_ctrlr *ctrlr)
>   	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);
>   }
>   
> @@ -456,6 +465,7 @@ static int send_single(struct rpmh_ctrlr *ctrlr, enum rpmh_state state,
>   int rpmh_flush(struct rpmh_ctrlr *ctrlr)
>   {
>   	struct cache_req *p;
> +	unsigned long flags;
>   	int ret;
>   
>   	if (!ctrlr->dirty) {
> @@ -488,7 +498,9 @@ int rpmh_flush(struct rpmh_ctrlr *ctrlr)
>   			return ret;
>   	}
>   
> +	spin_lock_irqsave(&ctrlr->cache_lock, flags);
>   	ctrlr->dirty = false;
> +	spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
>   
>   	return 0;
>   }
> @@ -507,7 +519,6 @@ int rpmh_invalidate(const struct device *dev)
>   	int ret;
>   
>   	invalidate_batch(ctrlr);
> -	ctrlr->dirty = true;
>   
>   	do {
>   		ret = rpmh_rsc_invalidate(ctrlr_to_drv(ctrlr));

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

  reply	other threads:[~2020-02-24  6:43 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-21  9:32 [PATCH v6 0/3] Invoke rpmh_flush for non OSI targets Maulik Shah
2020-02-21  9:32 ` [PATCH v6 1/3] arm64: dts: qcom: sc7180: Add cpuidle low power states Maulik Shah
2020-02-24  6:41   ` Srinivas Rao L
2020-02-21  9:32 ` [PATCH v6 2/3] soc: qcom: rpmh: Update dirty flag only when data changes Maulik Shah
2020-02-24  6:43   ` Srinivas Rao L [this message]
2020-02-21  9:32 ` [PATCH v6 3/3] soc: qcom: rpmh: Invoke rpmh_flush for dirty caches Maulik Shah
2020-02-24  6:48   ` Srinivas Rao L

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