linux-kernel - Re: [PATCH RFC v4 5/6] firmware/efi: Process CXL Component Events

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Date:   Wed, 29 Nov 2023 06:28:01 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>,
        Ira Weiny <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        "Jonathan Cameron" <jonathan.cameron@...wei.com>,
        Shiju Jose <shiju.jose@...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 v4 5/6] firmware/efi: Process CXL Component Events

Smita Koralahalli wrote:
> Hi Ira,
> 
> I tested this out. Just one correction below to make it work.
> 

[snip]

> > +
> > +#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;
> > +} __packed;
> 
> __packed attribute just for cper_cxl_event_rec still fails to properly 
> align structure elements. Looks like, __packed attribute is needed for 
> all structs (cper_cxl_event_devid and cper_cxl_event_sn) inside 
> cper_cxl_event_rec.
> 
> Seems easier to use global pragma instead.. I could test and obtain the 
> output as expected using pragma..

I did not know that was acceptable in the kernel but I see you used it in
cper_cxl.h before...

Ok I'll do that and spin again.

Thanks so much for testing this!  I was out last week and still don't have
a test environment.

Ira