linux-kernel - Re: [PATCH v6 1/2] soc: hisilicon: Support HCCS driver on Kunpeng SoC

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Message-ID: <158db0ea-48f5-ccd8-9a8d-6bbbbbd8243f@huawei.com>
Date:   Mon, 7 Aug 2023 09:14:00 +0800
From:   "lihuisong (C)" <lihuisong@...wei.com>
To:     Zenghui Yu <zenghui.yu@...ux.dev>, <xuwei5@...ilicon.com>,
        <arnd@...db.de>, <krzk@...nel.org>, <sudeep.holla@....com>,
        <rdunlap@...radead.org>
CC:     <linux-kernel@...r.kernel.org>, <soc@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <wanghuiqiang@...wei.com>,
        <tanxiaofei@...wei.com>, <liuyonglong@...wei.com>
Subject: Re: [PATCH v6 1/2] soc: hisilicon: Support HCCS driver on Kunpeng SoC


在 2023/8/6 23:09, Zenghui Yu 写道:
> A few trivial comments inline.

Hi Zenghui,

Many thanks for reviewing my patch carefully.😁

>
> On 2023/8/1 10:41, Huisong Li wrote:
>> The Huawei Cache Coherence System (HCCS) is a multi-chip interconnection
>> bus protocol. The performance of the application may be affected if some
>> HCCS ports on platform are not in full lane status, have a large number
>> of CRC errors and so on.
>>
>> This driver provides the query interface of the health status and
>> port information of HCCS on Kunpeng SoC.
>>
>> Signed-off-by: Huisong Li <lihuisong@...wei.com>
>
> [...]
>
>> +static int hccs_query_all_port_info_on_platform(struct hccs_dev *hdev)
>> +{
>> +
>> +    struct device *dev = hdev->dev;
>> +    struct hccs_chip_info *chip;
>> +    struct hccs_die_info *die;
>> +    u8 i, j;
>> +    int ret;
>> +
>> +    for (i = 0; i < hdev->chip_num; i++) {
>> +        chip = &hdev->chips[i];
>> +        for (j = 0; j < chip->die_num; j++) {
>> +            die = &chip->dies[j];
>> +            if (!die->port_num)
>> +                continue;
>> +
>> +            die->ports = devm_kzalloc(dev,
>> +                die->port_num * sizeof(struct hccs_port_info),
>> +                GFP_KERNEL);
>> +            if (!die->ports) {
>> +                dev_err(dev, "allocate ports memory on chip%u/die%u 
>> failed.\n",
>> +                    i, die->die_id);
>> +                return -ENOMEM;
>> +            }
>> +
>> +            ret = hccs_get_all_port_info_on_die(hdev, die);
>> +            if (ret) {
>> +                dev_err(dev, "get die(%u) info on chip%u failed, ret 
>> = %d.\n",
>
> "get *port* info failed"?
Yes, this is more exact.
Will be fixed to "get port info on chip%u/die%u failed"
>
>> +static int hccs_get_die_all_link_status(struct hccs_dev *hdev,
>> +                    const struct hccs_die_info *die,
>> +                    u8 *all_linked)
>> +{
>> +    struct hccs_die_comm_req_param *req_param;
>> +    struct hccs_desc desc;
>> +    int ret;
>> +
>> +    if (die->port_num == 0) {
>> +        *all_linked = 1;
>> +        return 0;
>> +    }
>> +
>> +    hccs_init_req_desc(&desc);
>> +    req_param = (struct hccs_die_comm_req_param *)desc.req.data;
>> +    req_param->chip_id = die->chip->chip_id;
>> +    req_param->die_id = die->die_id;
>> +    ret = hccs_pcc_cmd_send(hdev, HCCS_GET_DIE_PORTS_LANE_STA, &desc);
>
> Typo? Looks like we intend to send a HCCS_GET_DIE_PORTS_LINK_STA
> command.

Yes, you are right. It's my fault.

Appreciate you so much for pointing it out.

I will also check other commands again.

>
>> +/*
>> + * This value cannot be 255, otherwise the loop of the multi-BD 
>> communication
>> + * case cannot end.
>> + */
>> +#define HCCS_DIE_MAX_PORT_ID    254
>
> This looks weird. Isn't the "max port id" depends on your HW
> implementation?
>
>> +#define hccs_get_field(origin, mask, shift) \
>> +    (((origin) & (mask)) >> (shift))
>> +#define hccs_get_bit(origin, shift) \
>> +    hccs_get_field((origin), (0x1UL << (shift)), (shift))
>
> Unused macroes.
>
> P.S., I'd personally prefer splitting this patch in 2 to ease other
> reviewer's work:
>
> - deal with the HCCS HW (chip/die/port) probing
> - focus on the sysfs/query things
>
> Zenghui
> .