linux-kernel - Re: [PATCH v15 6/9] cxl: Update error handlers to support CXL Port protocol errors

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Message-ID: <20260203155411.00004c0d@huawei.com>
Date: Tue, 3 Feb 2026 15:54:11 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: Terry Bowman <terry.bowman@....com>
CC: <dave@...olabs.net>, <dave.jiang@...el.com>, <alison.schofield@...el.com>,
	<dan.j.williams@...el.com>, <bhelgaas@...gle.com>, <shiju.jose@...wei.com>,
	<ming.li@...omail.com>, <Smita.KoralahalliChannabasappa@....com>,
	<rrichter@....com>, <dan.carpenter@...aro.org>,
	<PradeepVineshReddy.Kodamati@....com>, <lukas@...ner.de>,
	<Benjamin.Cheatham@....com>, <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	<linux-cxl@...r.kernel.org>, <vishal.l.verma@...el.com>, <alucerop@....com>,
	<ira.weiny@...el.com>, <linux-kernel@...r.kernel.org>,
	<linux-pci@...r.kernel.org>
Subject: Re: [PATCH v15 6/9] cxl: Update error handlers to support CXL Port
 protocol errors

On Mon, 2 Feb 2026 20:52:41 -0600
Terry Bowman <terry.bowman@....com> wrote:

> CXL Protocol errors are logged for Endpoints in cxl_handle_ras() and
> cxl_handle_cor_ras(). The same is missing for CXL Port devices. The CXL
> Port logging function is already present but needs a call added from
> the handlers.
> 
> Update cxl_handle_ras() and cxl_handle_cor_ras() to call the CXL Port
> trace logging function.
> 
> Also, add log messages in the case 'ras_base' is NULL. And, add calls to
> the existing CXL Port tracing in the same functions.
> 
> Signed-off-by: Terry Bowman <terry.bowman@....com>
The error type was already wrongly documented for cxl_handle_ras().
This makes that comment inaccurate in a different way, particularly as you return a bool
value for a pci_ers_result_t.
> 
> ---
> 
> Changes in v14 -> v15:
> - New commit
> ---
>  drivers/cxl/core/core.h | 10 ++++++----
>  drivers/cxl/core/ras.c  | 30 ++++++++++++++++++++++--------
>  2 files changed, 28 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h
> index 92aea110817d..3b232e991b12 100644
> --- a/drivers/cxl/core/core.h
> +++ b/drivers/cxl/core/core.h

> diff --git a/drivers/cxl/core/ras.c b/drivers/cxl/core/ras.c
> index 0216dafa6118..970ff3df442c 100644
> --- a/drivers/cxl/core/ras.c
> +++ b/drivers/cxl/core/ras.c

>  /* CXL spec rev3.0 8.2.4.16.1 */
> @@ -317,15 +324,19 @@ static void header_log_copy(void __iomem *ras_base, u32 *log)
>   * Log the state of the RAS status registers and prepare them to log the
>   * next error status. Return 1 if reset needed.

It didn't return 1 previously and doesn't do in a different way now.
So comment needs an update.

>   */
> -bool cxl_handle_ras(struct device *dev, u64 serial, void __iomem *ras_base)
> +pci_ers_result_t
> +cxl_handle_ras(struct device *dev, u64 serial, void __iomem *ras_base)
>  {
>  	u32 hl[CXL_HEADERLOG_SIZE_U32];
>  	void __iomem *addr;
>  	u32 status;
>  	u32 fe;
>  
> -	if (!ras_base)
> +	if (!ras_base) {
> +		pr_err_ratelimited("%s: CXL RAS registers aren't mapped\n",
> +				   dev_name(dev));
>  		return false;

returning false as pci_err_result_t?

> +	}
>  
>  	addr = ras_base + CXL_RAS_UNCORRECTABLE_STATUS_OFFSET;
>  	status = readl(addr);
> @@ -344,10 +355,13 @@ bool cxl_handle_ras(struct device *dev, u64 serial, void __iomem *ras_base)
>  	}
>  
>  	header_log_copy(ras_base, hl);
> -	trace_cxl_aer_uncorrectable_error(dev, status, fe, hl, serial);
> +	if (is_cxl_memdev(dev))
> +		trace_cxl_aer_uncorrectable_error(dev, status, fe, hl, serial);
> +	else
> +		trace_cxl_port_aer_uncorrectable_error(dev, status, fe, hl);
>  	writel(status & CXL_RAS_UNCORRECTABLE_STATUS_MASK, addr);
>  
> -	return true;
> +	return PCI_ERS_RESULT_PANIC;
>  }
>  
>  static void cxl_port_cor_error_detected(struct device *dev)