linux-kernel - Re: [PATCH RFC v3 5/6] firmware/efi: Process CXL Component Events

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Date:   Thu, 2 Nov 2023 17:30:51 -0700
From:   Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
To:     Ira Weiny <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>
Cc:     Yazen Ghannam <yazen.ghannam@....com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Dave Jiang <dave.jiang@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ard Biesheuvel <ardb@...nel.org>, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org
Subject: Re: [PATCH RFC v3 5/6] firmware/efi: Process CXL Component Events

On 11/1/2023 2:11 PM, Ira Weiny wrote:

[snip]

> diff --git a/include/linux/cxl-event.h b/include/linux/cxl-event.h
> index 6b689e1efc78..2bdadde80f1a 100644
> --- a/include/linux/cxl-event.h
> +++ b/include/linux/cxl-event.h
> @@ -108,4 +108,53 @@ struct cxl_event_record_raw {
>   	union cxl_event event;
>   } __packed;
>   
> +enum cxl_event_type {
> +	CXL_CPER_EVENT_GEN_MEDIA,
> +	CXL_CPER_EVENT_DRAM,
> +	CXL_CPER_EVENT_MEM_MODULE,
> +};
> +
> +#define CPER_CXL_DEVICE_ID_VALID		BIT(0)
> +#define CPER_CXL_DEVICE_SN_VALID		BIT(1)
> +#define CPER_CXL_COMP_EVENT_LOG_VALID		BIT(2)
> +struct cper_cxl_event_rec {
> +	struct {
> +		u32 length;
> +		u64 validation_bits;
> +		struct cper_cxl_event_devid {
> +			u16 vendor_id;
> +			u16 device_id;
> +			u8 func_num;
> +			u8 device_num;
> +			u8 bus_num;
> +			u16 segment_num;
> +			u16 slot_num; /* bits 2:0 reserved */
> +			u8 reserved;
> +		} device_id;
> +		struct cper_cxl_event_sn {
> +			u32 lower_dw;
> +			u32 upper_dw;
> +		} dev_serial_num;
> +	} hdr;
> +
> +	union cxl_event event;
> +};

Do we need pragma pack or similar for alignment here?

Thanks,
Smita

> +
> +struct cxl_cper_notifier_data {
> +	enum cxl_event_type event_type;
> +	struct cper_cxl_event_rec *rec;
> +};
> +
> +#ifdef CONFIG_UEFI_CPER
> +int register_cxl_cper_notifier(struct notifier_block *nb);
> +void unregister_cxl_cper_notifier(struct notifier_block *nb);
> +#else
> +static inline int register_cxl_cper_notifier(struct notifier_block *nb)
> +{
> +	return 0;
> +}
> +
> +static inline void unregister_cxl_cper_notifier(struct notifier_block *nb) { }
> +#endif
> +
>   #endif /* _LINUX_CXL_EVENT_H */
>