linux-kernel - Re: [PATCH 1/2] soc: hisilicon: kunpeng_hbmdev: Add support for controling the power of hbm memory

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Message-ID: <a10e34df-bbd8-462a-8851-51eabda87775@oss.qualcomm.com>
Date: Mon, 9 Dec 2024 15:56:19 -0800
From: Jeff Johnson <jeff.johnson@....qualcomm.com>
To: Zhang Zekun <zhangzekun11@...wei.com>, xuwei5@...ilicon.com,
        lihuisong@...wei.com, Jonathan.Cameron@...wei.com
Cc: linux-kernel@...r.kernel.org, liuyongqiang13@...wei.com
Subject: Re: [PATCH 1/2] soc: hisilicon: kunpeng_hbmdev: Add support for
 controling the power of hbm memory

On 12/6/24 03:28, Zhang Zekun wrote:
> Add a driver for High Bandwidth Memory (HBM) devices, which will provide
> user space interfaces to power on/off the HBM devices. In Kunpeng servers,
> we need to control the power of HBM devices which can be power consuming
> and will only be used in some specialized scenarios, such as HPC. HBM
> memory devices in a socket are in the same power domain, and should be
> power off/on together.
> 
> HBM devices will be configured with ACPI device id "PNP0C80", and be used
> as a cpuless numa node. HBM devices in the same power domain will be put
> into the same container. ACPI function "_ON" and "_OFF" are reponsible
> for power on/off the HBM device, and notify the OS to fully online/offline
> the HBM memory.
> 
> Signed-off-by: Zhang Zekun <zhangzekun11@...wei.com>
> ---

...

> diff --git a/drivers/soc/hisilicon/Kconfig b/drivers/soc/hisilicon/Kconfig
> index 6d7c244d2e78..b3ca7d6f5d01 100644
> --- a/drivers/soc/hisilicon/Kconfig
> +++ b/drivers/soc/hisilicon/Kconfig
> @@ -21,4 +21,16 @@ config KUNPENG_HCCS
>  	  health status and port information of HCCS, or reducing system
>  	  power consumption on Kunpeng SoC.
>  
> +config KUNPENG_HBMDEV
> +	bool "add extra support for hbm memory device"
> +	depends on ACPI_HOTPLUG_MEMORY
> +	select ACPI_CONTAINER
> +	help
> +	  The driver provides methods for userpace to control the power
> +	  of HBM memory devices on Kunpeng soc, which can help to save
> +	  energy. The functionality of the driver would require dedicated
> +	  BIOS configuration.
> +
> +	  If not sure, say N.
> +
>  endmenu
> diff --git a/drivers/soc/hisilicon/Makefile b/drivers/soc/hisilicon/Makefile
> index 226e747e70d6..08048d73586e 100644
> --- a/drivers/soc/hisilicon/Makefile
> +++ b/drivers/soc/hisilicon/Makefile
> @@ -1,2 +1,3 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  obj-$(CONFIG_KUNPENG_HCCS)	+= kunpeng_hccs.o
> +obj-$(CONFIG_KUNPENG_HBMDEV)	+= kunpeng_hbmdev.o
...
> diff --git a/drivers/soc/hisilicon/kunpeng_hbmdev.c b/drivers/soc/hisilicon/kunpeng_hbmdev.c
> new file mode 100644
> index 000000000000..1945676ff502
> --- /dev/null
> +++ b/drivers/soc/hisilicon/kunpeng_hbmdev.c
> @@ -0,0 +1,210 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2024 Huawei Technologies Co., Ltd
> + */

...

> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Zhang Zekun <zhangzekun11@...wei.com>");

Since commit 1fffe7a34c89 ("script: modpost: emit a warning when the
description is missing"), a module without a MODULE_DESCRIPTION() will
result in a warning with make W=1. My usual guidance is to add the
missing MODULE_DESCRIPTION() to avoid such warnings. But in this case,
due to how your Kconfig & Makefile are defined, this can NEVER be built
as a module, and hence I'd remove all of the MODULE_*() macros.

/jeff