linux-kernel - Re: [PATCH 5/6 v7] acpi/ghes: Add helper to copy CXL protocol error info to work struct

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Message-ID: <d84eafa5-0038-436e-aa53-9675d4e630b6@intel.com>
Date: Fri, 7 Nov 2025 11:31:34 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: "Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>,
 linux-cxl@...r.kernel.org
Cc: "Rafael J . Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
 Tony Luck <tony.luck@...el.com>, Borislav Petkov <bp@...en8.de>,
 Hanjun Guo <guohanjun@...wei.com>, Mauro Carvalho Chehab
 <mchehab@...nel.org>, Shuai Xue <xueshuai@...ux.alibaba.com>,
 Davidlohr Bueso <dave@...olabs.net>,
 Jonathan Cameron <jonathan.cameron@...wei.com>,
 Alison Schofield <alison.schofield@...el.com>,
 Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>,
 Dan Williams <dan.j.williams@...el.com>,
 Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
 Oliver O'Halloran <oohall@...il.com>, Bjorn Helgaas <bhelgaas@...gle.com>,
 linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 5/6 v7] acpi/ghes: Add helper to copy CXL protocol error
 info to work struct



On 11/4/25 11:22 AM, Fabio M. De Francesco wrote:
> Make a helper out of cxl_cper_post_prot_err() that checks the CXL agent
> type and copy the CPER CXL protocol errors information to a work data
> structure.
> 
> Export the new symbol for reuse by ELOG.
> 
> Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
> Signed-off-by: Fabio M. De Francesco <fabio.m.de.francesco@...ux.intel.com>

Reviewed-by: Dave Jiang <dave.jiang@...el.com>> ---
>  drivers/acpi/apei/ghes.c | 42 ++++++++++++++++++++++++++--------------
>  include/cxl/event.h      | 10 ++++++++++
>  2 files changed, 37 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index e69ae864f43d..2f4632d9855a 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -734,20 +734,12 @@ int cxl_cper_sec_prot_err_valid(struct cxl_cper_sec_prot_err *prot_err)
>  }
>  EXPORT_SYMBOL_GPL(cxl_cper_sec_prot_err_valid);
>  
> -static void cxl_cper_post_prot_err(struct cxl_cper_sec_prot_err *prot_err,
> -				   int severity)
> +int cxl_cper_setup_prot_err_work_data(struct cxl_cper_prot_err_work_data *wd,
> +				      struct cxl_cper_sec_prot_err *prot_err,
> +				      int severity)
>  {
> -	struct cxl_cper_prot_err_work_data wd;
>  	u8 *dvsec_start, *cap_start;
>  
> -	if (cxl_cper_sec_prot_err_valid(prot_err))
> -		return;
> -
> -	guard(spinlock_irqsave)(&cxl_cper_prot_err_work_lock);
> -
> -	if (!cxl_cper_prot_err_work)
> -		return;
> -
>  	switch (prot_err->agent_type) {
>  	case RCD:
>  	case DEVICE:
> @@ -756,20 +748,40 @@ static void cxl_cper_post_prot_err(struct cxl_cper_sec_prot_err *prot_err,
>  	case RP:
>  	case DSP:
>  	case USP:
> -		memcpy(&wd.prot_err, prot_err, sizeof(wd.prot_err));
> +		memcpy(&wd->prot_err, prot_err, sizeof(wd->prot_err));
>  
>  		dvsec_start = (u8 *)(prot_err + 1);
>  		cap_start = dvsec_start + prot_err->dvsec_len;
>  
> -		memcpy(&wd.ras_cap, cap_start, sizeof(wd.ras_cap));
> -		wd.severity = cper_severity_to_aer(severity);
> +		memcpy(&wd->ras_cap, cap_start, sizeof(wd->ras_cap));
> +		wd->severity = cper_severity_to_aer(severity);
>  		break;
>  	default:
>  		pr_err_ratelimited("CXL CPER invalid agent type: %d\n",
>  				   prot_err->agent_type);
> -		return;
> +		return -EINVAL;
>  	}
>  
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(cxl_cper_setup_prot_err_work_data);
> +
> +static void cxl_cper_post_prot_err(struct cxl_cper_sec_prot_err *prot_err,
> +				   int severity)
> +{
> +	struct cxl_cper_prot_err_work_data wd;
> +
> +	if (cxl_cper_sec_prot_err_valid(prot_err))
> +		return;
> +
> +	guard(spinlock_irqsave)(&cxl_cper_prot_err_work_lock);
> +
> +	if (!cxl_cper_prot_err_work)
> +		return;
> +
> +	if (cxl_cper_setup_prot_err_work_data(&wd, prot_err, severity))
> +		return;
> +
>  	if (!kfifo_put(&cxl_cper_prot_err_fifo, wd)) {
>  		pr_err_ratelimited("CXL CPER kfifo overflow\n");
>  		return;
> diff --git a/include/cxl/event.h b/include/cxl/event.h
> index 4d7d1036ea9c..94081aec597a 100644
> --- a/include/cxl/event.h
> +++ b/include/cxl/event.h
> @@ -322,12 +322,22 @@ static inline int cxl_cper_prot_err_kfifo_get(struct cxl_cper_prot_err_work_data
>  
>  #ifdef CONFIG_ACPI_APEI_PCIEAER
>  int cxl_cper_sec_prot_err_valid(struct cxl_cper_sec_prot_err *prot_err);
> +int cxl_cper_setup_prot_err_work_data(struct cxl_cper_prot_err_work_data *wd,
> +				      struct cxl_cper_sec_prot_err *prot_err,
> +				      int severity);
>  #else
>  static inline int
>  cxl_cper_sec_prot_err_valid(struct cxl_cper_sec_prot_err *prot_err)
>  {
>  	return -EOPNOTSUPP;
>  }
> +static inline int
> +cxl_cper_setup_prot_err_work_data(struct cxl_cper_prot_err_work_data *wd,
> +				  struct cxl_cper_sec_prot_err *prot_err,
> +				  int severity)
> +{
> +	return -EOPNOTSUPP;
> +}
>  #endif
>  
>  #endif /* _LINUX_CXL_EVENT_H */