linux-kernel - Re: [PATCH v2] perf/smmuv3: Add MODULE

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Date:   Tue, 15 Aug 2023 09:48:04 +0800
From:   Liang Li <liliang6@...il.cn>
To:     Yicong Yang <yangyicong@...wei.com>
Cc:     will@...nel.org, mark.rutland@....com, liliang6@...il.cn,
        21cnbao@...il.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, jonathan.cameron@...wei.com,
        linuxarm@...wei.com, yangyicong@...ilicon.com
Subject: Re: [PATCH v2] perf/smmuv3: Add MODULE_ALIAS for module auto loading

On 2023-08-14 21:16, Yicong Yang <yangyicong@...wei.com> wrote:
> From: Yicong Yang <yangyicong@...ilicon.com>
> 
> On my ACPI based arm64 server, if the SMMUv3 PMU is configured as
> module it won't be loaded automatically after booting even if the
> device has already been scanned and added. It's because the module
> lacks a platform alias, the uevent mechanism and userspace tools
> like udevd make use of this to find the target driver module of the
> device. This patch adds the missing platform alias of the module,
> then module will be loaded automatically if device exists.
> 
> Before this patch:
> [root@...alhost tmp]# modinfo arm_smmuv3_pmu | grep alias
> alias:          of:N*T*Carm,smmu-v3-pmcgC*
> alias:          of:N*T*Carm,smmu-v3-pmcg
> 
> After this patch:
> [root@...alhost tmp]# modinfo arm_smmuv3_pmu | grep alias
> alias:          platform:arm-smmu-v3-pmcg
> alias:          of:N*T*Carm,smmu-v3-pmcgC*
> alias:          of:N*T*Carm,smmu-v3-pmcg
> 
> Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>
> ---
> Change since v1:
> - Further illustrate the issues and how to fix this
> - Use MODULE_ALIAS instead of MODULE_DEVICE_TABLE
> Link: https://lore.kernel.org/all/20230807122233.28563-1-yangyicong@huawei.com/
> 
>  drivers/perf/arm_smmuv3_pmu.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c
> index 25a269d431e4..4c32b6dbfe76 100644
> --- a/drivers/perf/arm_smmuv3_pmu.c
> +++ b/drivers/perf/arm_smmuv3_pmu.c
> @@ -984,6 +984,7 @@ static void __exit arm_smmu_pmu_exit(void)
>  
>  module_exit(arm_smmu_pmu_exit);
>  
> +MODULE_ALIAS("platform:arm-smmu-v3-pmcg");
>  MODULE_DESCRIPTION("PMU driver for ARM SMMUv3 Performance Monitors Extension");
>  MODULE_AUTHOR("Neil Leeder <nleeder@...eaurora.org>");
>  MODULE_AUTHOR("Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>");
> -- 
> 2.24.0

Looks good to me. :) Thanks.

Regards.
Liang Li