linux-kernel - Re: [PATCH v1 3/5] soc: qcom: memory

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Date:   Mon, 23 Oct 2023 15:56:36 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Zhenhua Huang <quic_zhenhuah@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...cinc.com,
        quic_tingweiz@...cinc.com
Subject: Re: [PATCH v1 3/5] soc: qcom: memory_dump: Add memory dump driver

On 23.10.2023 11:20, Zhenhua Huang wrote:
> Qualcomm memory dump driver initializes system memory dump table.
> Firmware dumps system cache, internal memory, peripheral registers
> to DDR as per this table after system crashes and warm resets. The
> driver reserves memory, populates ids and sizes for firmware dumping
> according to the configuration.
> 
> Signed-off-by: Zhenhua Huang <quic_zhenhuah@...cinc.com>
> ---
[...]


> +#define MAX_NUM_ENTRIES		0x150
The number of entries makes more sense as a dec number

> +#define QCOM_DUMP_MAKE_VERSION(major, minor)	(((major) << 20) | (minor))
> +#define QCOM_DUMP_TABLE_VERSION		QCOM_DUMP_MAKE_VERSION(2, 0)
I feel like doing this:

#define QCOM_DUMP_TABLE_VERSION(major, minor)	((major << 20) | (minor))

...

someval = QCOM_DUMP_TABLE_VERSION(2, 0)

would make more sense, since v2.0 seems to be the only supported target..

[...]

> +			if (phys_addr > phys_end_addr) {
> +				dev_err_probe(dev, -ENOMEM, "Exceeding allocated region\n");
> +				return -ENOMEM;
> +			}
> +		} else {
> +			continue;
You can check for the inverse and bail out early, saving yourself
a lot of tabs

[...]

> +MODULE_DESCRIPTION("Memory Dump Driver");
Missing some mention of it being QC specific

Konrad