linux-kernel - Re: [PATCH v12 24/25] CXL/PCI: Enable CXL protocol errors during CXL Port probe

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Message-ID: <43ca8a5c-9da5-4d36-a51a-f551174088e9@intel.com>
Date: Mon, 29 Sep 2025 17:28:57 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Terry Bowman <terry.bowman@....com>, dave@...olabs.net,
 jonathan.cameron@...wei.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, alucerop@....com, ira.weiny@...el.com
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v12 24/25] CXL/PCI: Enable CXL protocol errors during CXL
 Port probe



On 9/25/25 3:34 PM, Terry Bowman wrote:
> CXL protocol errors are not enabled for all CXL devices after boot. These
> must be enabled inorder to process CXL protocol errors.
> 
> Introduce cxl_unmask_proto_interrupts() to call pci_aer_unmask_internal_errors().
> pci_aer_unmask_internal_errors() expects the pdev->aer_cap is initialized.
> But, dev->aer_cap is not initialized for CXL Upstream Switch Ports and CXL
> Downstream Switch Ports. Initialize the dev->aer_cap if necessary. Enable AER
> correctable internal errors and uncorrectable internal errors for all CXL
> devices.
> 
> Signed-off-by: Terry Bowman <terry.bowman@....com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>

Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> 
> ---
> Changes in v11->v12:
> - None
> 
> Changes in v10->v11:
> - Added check for valid PCI devices in is_cxl_error() (Terry)
> - Removed check for RCiEP in cxl_handle_proto_err() and
>   cxl_report_error_detected() (Terry)
> ---
>  drivers/cxl/core/ras.c | 26 +++++++++++++++++++++++++-
>  1 file changed, 25 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/core/ras.c b/drivers/cxl/core/ras.c
> index 45f92defca64..ea65001daba1 100644
> --- a/drivers/cxl/core/ras.c
> +++ b/drivers/cxl/core/ras.c
> @@ -238,6 +238,21 @@ static inline void cxl_disable_rch_root_ints(struct cxl_dport *dport) { }
>  static inline void cxl_handle_rdport_errors(struct cxl_dev_state *cxlds) { }
>  #endif
>  
> +static void cxl_unmask_proto_interrupts(struct device *dev)
> +{
> +	struct pci_dev *pdev __free(pci_dev_put) =
> +		pci_dev_get(to_pci_dev(dev));
> +
> +	if (!pdev->aer_cap) {
> +		pdev->aer_cap = pci_find_ext_capability(pdev,
> +							PCI_EXT_CAP_ID_ERR);
> +		if (!pdev->aer_cap)
> +			return;
> +	}
> +
> +	pci_aer_unmask_internal_errors(pdev);
> +}
> +
>  static void cxl_dport_map_ras(struct cxl_dport *dport)
>  {
>  	struct cxl_register_map *map = &dport->reg_map;
> @@ -391,7 +406,10 @@ void cxl_dport_init_ras_reporting(struct cxl_dport *dport, struct device *host)
>  
>  		cxl_dport_map_rch_aer(dport);
>  		cxl_disable_rch_root_ints(dport);
> +		return;
>  	}
> +
> +	cxl_unmask_proto_interrupts(dport->dport_dev);
>  }
>  EXPORT_SYMBOL_NS_GPL(cxl_dport_init_ras_reporting, "CXL");
>  
> @@ -402,8 +420,12 @@ static void cxl_uport_init_ras_reporting(struct cxl_port *port,
>  
>  	map->host = host;
>  	if (cxl_map_component_regs(map, &port->uport_regs,
> -				   BIT(CXL_CM_CAP_CAP_ID_RAS)))
> +				   BIT(CXL_CM_CAP_CAP_ID_RAS))) {
>  		dev_dbg(&port->dev, "Failed to map RAS capability\n");
> +		return;
> +	}
> +
> +	cxl_unmask_proto_interrupts(port->uport_dev);
>  }
>  
>  void cxl_switch_port_init_ras(struct cxl_port *port)
> @@ -440,6 +462,8 @@ void cxl_endpoint_port_init_ras(struct cxl_port *ep)
>  	}
>  
>  	cxl_dport_init_ras_reporting(parent_dport, cxlmd->cxlds->dev);
> +
> +	cxl_unmask_proto_interrupts(cxlmd->cxlds->dev);
>  }
>  EXPORT_SYMBOL_NS_GPL(cxl_endpoint_port_init_ras, "CXL");
>