linux-kernel - Re: [PATCH v2 2/2] efi/cper, cxl: Decode CXL Error Log

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Date:   Thu, 3 Nov 2022 17:57:09 +0000
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
CC:     <linux-efi@...r.kernel.org>, <linux-cxl@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Ard Biesheuvel <ardb@...nel.org>,
        "Alison Schofield" <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        "Yazen Ghannam" <yazen.ghannam@....com>
Subject: Re: [PATCH v2 2/2] efi/cper, cxl: Decode CXL Error Log

On Fri, 28 Oct 2022 20:09:50 +0000
Smita Koralahalli <Smita.KoralahalliChannabasappa@....com> wrote:

> Print the CXL Error Log field as found in CXL Protocol Error Section.
> 
> The CXL RAS Capability structure will be reused by OS First Handling
> and the duplication/appropriate placement will be addressed eventually.
> 
> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
Hi Smita,

Ah.  Now I see why stuff wasn't in patch 1 that I expected to be there.

LGTM

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>




> ---
> v2:
> 	Printed all fields separately.
> 	Printed cap_control.
> 	Prefix cxl_.
> 	Provided the reference.
> ---
>  drivers/firmware/efi/cper_cxl.c | 27 +++++++++++++++++++++++++++
>  include/linux/cxl_err.h         | 22 ++++++++++++++++++++++
>  2 files changed, 49 insertions(+)
>  create mode 100644 include/linux/cxl_err.h
> 
> diff --git a/drivers/firmware/efi/cper_cxl.c b/drivers/firmware/efi/cper_cxl.c
> index 6c94af234be9..53e435c4f310 100644
> --- a/drivers/firmware/efi/cper_cxl.c
> +++ b/drivers/firmware/efi/cper_cxl.c
> @@ -9,6 +9,7 @@
>  
>  #include <linux/cper.h>
>  #include "cper_cxl.h"
> +#include <linux/cxl_err.h>
>  
>  #define PROT_ERR_VALID_AGENT_TYPE		BIT_ULL(0)
>  #define PROT_ERR_VALID_AGENT_ADDRESS		BIT_ULL(1)
> @@ -16,6 +17,7 @@
>  #define PROT_ERR_VALID_SERIAL_NUMBER		BIT_ULL(3)
>  #define PROT_ERR_VALID_CAPABILITY		BIT_ULL(4)
>  #define PROT_ERR_VALID_DVSEC			BIT_ULL(5)
> +#define PROT_ERR_VALID_ERROR_LOG		BIT_ULL(6)
>  
>  static const char * const prot_err_agent_type_strs[] = {
>  	"Restricted CXL Device",
> @@ -149,4 +151,29 @@ void cper_print_prot_err(const char *pfx, const struct cper_sec_prot_err *prot_e
>  		print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4, (prot_err + 1),
>  			       prot_err->dvsec_len, 0);
>  	}
> +
> +	if (prot_err->valid_bits & PROT_ERR_VALID_ERROR_LOG) {
> +		size_t size = sizeof(*prot_err) + prot_err->dvsec_len;
> +		struct cxl_ras_capability_regs *cxl_ras;
> +
> +		pr_info("%s Error log length: 0x%04x\n", pfx, prot_err->err_len);
> +
> +		pr_info("%s CXL Error Log:\n", pfx);
> +		cxl_ras = (struct cxl_ras_capability_regs *)((long)prot_err + size);
> +		pr_info("%s cxl_ras_uncor_status: 0x%08x", pfx,
> +			cxl_ras->uncor_status);
> +		pr_info("%s cxl_ras_uncor_mask: 0x%08x\n", pfx,
> +			cxl_ras->uncor_mask);
> +		pr_info("%s cxl_ras_uncor_severity: 0x%08x\n", pfx,
> +			cxl_ras->uncor_severity);
> +		pr_info("%s cxl_ras_cor_status: 0x%08x", pfx,
> +			cxl_ras->cor_status);
> +		pr_info("%s cxl_ras_cor_mask: 0x%08x\n", pfx,
> +			cxl_ras->cor_mask);
> +		pr_info("%s cap_control: 0x%08x\n", pfx,
> +			cxl_ras->cap_control);
> +		pr_info("%s Header Log Registers:\n", pfx);
> +		print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4, cxl_ras->header_log,
> +			       sizeof(cxl_ras->header_log), 0);
> +	}
>  }
> diff --git a/include/linux/cxl_err.h b/include/linux/cxl_err.h
> new file mode 100644
> index 000000000000..629e1bdeda44
> --- /dev/null
> +++ b/include/linux/cxl_err.h
> @@ -0,0 +1,22 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (C) 2022 Advanced Micro Devices, Inc.
> + *
> + * Author: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
> + */
> +
> +#ifndef LINUX_CXL_ERR_H
> +#define LINUX_CXL_ERR_H
> +
> +/* CXL RAS Capability Structure, CXL v3.1 sec 8.2.4.16 */
> +struct cxl_ras_capability_regs {
> +	u32 uncor_status;
> +	u32 uncor_mask;
> +	u32 uncor_severity;
> +	u32 cor_status;
> +	u32 cor_mask;
> +	u32 cap_control;
> +	u32 header_log[16];
> +};
> +
> +#endif //__CXL_ERR_