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

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Message-ID: <f27bcfff-f710-4a76-b94e-8f1e5365802b@quicinc.com>
Date: Wed, 20 Mar 2024 23:29:13 +0530
From: Odelu Kukatla <quic_okukatla@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@...aro.org>,
        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 3/6/2024 9:48 PM, Konrad Dybcio wrote:
> 
> 
> 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
> 

I will address this in next version.

>>   
>>   #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..
> 

I will fix this in v4.

>> +#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..
> 
> [...]
> 

Right, it is not needed.

>> + * @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
> 

I will fix this in v4.

>> + * @prio_fwd_disable: whether to forward the priority driven by mster, or override by @prio
> 
> typo: mster, please also wrap it
> 
> Konrad

Thanks,
Odelu