linux-kernel - Re: [PATCH v4 19/22] interconnect: qcom: icc-rpm: Fix bucket number

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Date:   Tue, 13 Jun 2023 22:06:40 +0200
From:   Stephan Gerhold <stephan@...hold.net>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Georgi Djakov <djakov@...nel.org>,
        Leo Yan <leo.yan@...aro.org>,
        Evan Green <evgreen@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v4 19/22] interconnect: qcom: icc-rpm: Fix bucket number

On Tue, Jun 13, 2023 at 04:03:19PM +0200, Konrad Dybcio wrote:
> SMD RPM only provides two buckets, one each for the active-only and
> active-sleep RPM contexts. Use the correct constant to allocate and
> operate on them.
> 
> This will make the qcom,icc.h header no longer work with this driver,
> mostly because.. it was never meant to! The commit that introduced
> bucket support to SMD RPM was trying to shove a square into a round
> hole and it did not work out very well. That said, there are no
> active users of SMD RPM ICC + qcom,icc.h, so that doesn't hurt.
> 
> Fixes: dcbce7b0a79c ("interconnect: qcom: icc-rpm: Support multiple buckets")
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Reviewed-by: Stephan Gerhold <stephan@...hold.net>

> ---
>  drivers/interconnect/qcom/icc-rpm.c | 16 ++++++++--------
>  drivers/interconnect/qcom/icc-rpm.h |  6 +++---
>  2 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c
> index f9d0ecba5631..01e14b8ced64 100644
> --- a/drivers/interconnect/qcom/icc-rpm.c
> +++ b/drivers/interconnect/qcom/icc-rpm.c
> @@ -249,7 +249,7 @@ static void qcom_icc_pre_bw_aggregate(struct icc_node *node)
>  	size_t i;
>  
>  	qn = node->data;
> -	for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++) {
> +	for (i = 0; i < QCOM_SMD_RPM_STATE_NUM; i++) {
>  		qn->sum_avg[i] = 0;
>  		qn->max_peak[i] = 0;
>  	}
> @@ -273,9 +273,9 @@ static int qcom_icc_bw_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
>  	qn = node->data;
>  
>  	if (!tag)
> -		tag = QCOM_ICC_TAG_ALWAYS;
> +		tag = RPM_ALWAYS_TAG;
>  
> -	for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++) {
> +	for (i = 0; i < QCOM_SMD_RPM_STATE_NUM; i++) {
>  		if (tag & BIT(i)) {
>  			qn->sum_avg[i] += avg_bw;
>  			qn->max_peak[i] = max_t(u32, qn->max_peak[i], peak_bw);
> @@ -300,11 +300,11 @@ static void qcom_icc_bus_aggregate(struct icc_provider *provider,
>  {
>  	struct icc_node *node;
>  	struct qcom_icc_node *qn;
> -	u64 sum_avg[QCOM_ICC_NUM_BUCKETS];
> +	u64 sum_avg[QCOM_SMD_RPM_STATE_NUM];
>  	int i;
>  
>  	/* Initialise aggregate values */
> -	for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++) {
> +	for (i = 0; i < QCOM_SMD_RPM_STATE_NUM; i++) {
>  		agg_avg[i] = 0;
>  		agg_peak[i] = 0;
>  	}
> @@ -317,7 +317,7 @@ static void qcom_icc_bus_aggregate(struct icc_provider *provider,
>  	 */
>  	list_for_each_entry(node, &provider->nodes, node_list) {
>  		qn = node->data;
> -		for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++) {
> +		for (i = 0; i < QCOM_SMD_RPM_STATE_NUM; i++) {
>  			if (qn->channels)
>  				sum_avg[i] = div_u64(qn->sum_avg[i], qn->channels);
>  			else
> @@ -328,7 +328,7 @@ static void qcom_icc_bus_aggregate(struct icc_provider *provider,
>  	}
>  
>  	/* Find maximum values across all buckets */
> -	for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++)
> +	for (i = 0; i < QCOM_SMD_RPM_STATE_NUM; i++)
>  		*max_agg_avg = max_t(u64, *max_agg_avg, agg_avg[i]);
>  }
>  
> @@ -339,7 +339,7 @@ static int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
>  	struct icc_provider *provider;
>  	u64 sum_bw;
>  	u64 active_rate, sleep_rate;
> -	u64 agg_avg[QCOM_ICC_NUM_BUCKETS], agg_peak[QCOM_ICC_NUM_BUCKETS];
> +	u64 agg_avg[QCOM_SMD_RPM_STATE_NUM], agg_peak[QCOM_SMD_RPM_STATE_NUM];
>  	u64 max_agg_avg;
>  	int ret;
>  
> diff --git a/drivers/interconnect/qcom/icc-rpm.h b/drivers/interconnect/qcom/icc-rpm.h
> index a4588a3aebf3..fe928ab6b878 100644
> --- a/drivers/interconnect/qcom/icc-rpm.h
> +++ b/drivers/interconnect/qcom/icc-rpm.h
> @@ -10,7 +10,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/soc/qcom/smd-rpm.h>
>  
> -#include <dt-bindings/interconnect/qcom,icc.h>
> +#include <dt-bindings/interconnect/qcom,rpm-icc.h>
>  
>  #define RPM_BUS_MASTER_REQ	0x73616d62
>  #define RPM_BUS_SLAVE_REQ	0x766c7362
> @@ -105,8 +105,8 @@ struct qcom_icc_node {
>  	u16 num_links;
>  	u16 channels;
>  	u16 buswidth;
> -	u64 sum_avg[QCOM_ICC_NUM_BUCKETS];
> -	u64 max_peak[QCOM_ICC_NUM_BUCKETS];
> +	u64 sum_avg[QCOM_SMD_RPM_STATE_NUM];
> +	u64 max_peak[QCOM_SMD_RPM_STATE_NUM];
>  	int mas_rpm_id;
>  	int slv_rpm_id;
>  	struct qcom_icc_qos qos;
> 
> -- 
> 2.41.0
>