linux-hardening - Re: [PATCH v3 1/4] interconnect: qcom: icc-rpmh: Add QoS configuration support

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Date: Wed, 6 Mar 2024 17:18:44 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Odelu Kukatla <quic_okukatla@...cinc.com>,
 Bjorn Andersson <andersson@...nel.org>, Georgi Djakov <djakov@...nel.org>,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: Kees Cook <keescook@...omium.org>, cros-qcom-dts-watchers@...omium.org,
 "Gustavo A . R . Silva" <gustavoars@...nel.org>,
 linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org, quic_rlaggysh@...cinc.com,
 quic_mdtipton@...cinc.com
Subject: Re: [PATCH v3 1/4] interconnect: qcom: icc-rpmh: Add QoS
 configuration support



On 3/6/24 08:30, Odelu Kukatla wrote:
> It adds QoS support for QNOC device and includes support for
> configuring priority, priority forward disable, urgency forwarding.
> This helps in priortizing the traffic originating from different
> interconnect masters at NoC(Network On Chip).
> 
> Signed-off-by: Odelu Kukatla <quic_okukatla@...cinc.com>
> ---
>   drivers/interconnect/qcom/icc-rpmh.c | 105 +++++++++++++++++++++++++++
>   drivers/interconnect/qcom/icc-rpmh.h |  32 ++++++++
>   2 files changed, 137 insertions(+)
> 
> diff --git a/drivers/interconnect/qcom/icc-rpmh.c b/drivers/interconnect/qcom/icc-rpmh.c
> index c1aa265c1f4e..b4681849df80 100644
> --- a/drivers/interconnect/qcom/icc-rpmh.c
> +++ b/drivers/interconnect/qcom/icc-rpmh.c
> @@ -1,19 +1,57 @@
>   // SPDX-License-Identifier: GPL-2.0
>   /*
>    * Copyright (c) 2020, The Linux Foundation. All rights reserved.
> + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
>    */
>   
> +#include <linux/clk.h>
>   #include <linux/interconnect.h>
>   #include <linux/interconnect-provider.h>
>   #include <linux/module.h>
>   #include <linux/of.h>
>   #include <linux/of_platform.h>
>   #include <linux/slab.h>
> +#include <linux/bitfield.h>

Please keep the alphabetical order

>   
>   #include "bcm-voter.h"
>   #include "icc-common.h"
>   #include "icc-rpmh.h"
>   
> +/* QNOC QoS */
> +#define QOSGEN_MAINCTL_LO(p, qp)	(0x8 + (p->port_offsets[qp]))
> +#define QOS_SLV_URG_MSG_EN_MASK		BIT_MASK(3)

Mixing BIT_MASK and GENMASK is very confusing..

> +#define QOS_DFLT_PRIO_MASK		GENMASK(6, 4)
> +#define QOS_DISABLE_MASK		BIT_MASK(24)
> +
> +/**
> + * qcom_icc_set_qos - initialize static QoS configurations
> + * @qp: qcom icc provider to which @node belongs
> + * @node: qcom icc node to operate on
> + */
> +static void qcom_icc_set_qos(struct qcom_icc_provider *qp,
> +				struct qcom_icc_node *node)
> +{
> +	const struct qcom_icc_qosbox *qos = node->qosbox;
> +	int port;
> +
> +	if (!qp->regmap || !qos)
> +		return;

This is not possible if you follow the code flow, I think..

[...]

> + * @prio: priority value assigned to requests on the node
> + * @urg_fwd: whether to forward the urgency promotion issued by master(endpoint), or discard

space before the opening brace, please also wrap to 80 lines

> + * @prio_fwd_disable: whether to forward the priority driven by mster, or override by @prio

typo: mster, please also wrap it

Konrad