linux-kernel - Re: [PATCH v7 16/17] PCI/AER: Enable internal errors for CXL Upstream and Downstream Switch Ports

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Message-ID: <20250211202523.GA53686@bhelgaas>
Date: Tue, 11 Feb 2025 14:25:23 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Terry Bowman <terry.bowman@....com>
Cc: linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, nifan.cxl@...il.com, dave@...olabs.net,
	jonathan.cameron@...wei.com, dave.jiang@...el.com,
	alison.schofield@...el.com, vishal.l.verma@...el.com,
	dan.j.williams@...el.com, bhelgaas@...gle.com, mahesh@...ux.ibm.com,
	ira.weiny@...el.com, oohall@...il.com, Benjamin.Cheatham@....com,
	rrichter@....com, nathan.fontenot@....com,
	Smita.KoralahalliChannabasappa@....com, lukas@...ner.de,
	ming.li@...omail.com, PradeepVineshReddy.Kodamati@....com
Subject: Re: [PATCH v7 16/17] PCI/AER: Enable internal errors for CXL
 Upstream and Downstream Switch Ports

On Tue, Feb 11, 2025 at 01:24:43PM -0600, Terry Bowman wrote:
> The AER service driver enables PCIe Uncorrectable Internal Errors (UIE) and
> Correctable Internal errors (CIE) for CXL Root Ports. The UIE and CIE are
> used in reporting CXL Protocol Errors. The same UIE/CIE enablement is
> needed for CXL Upstream Switch Ports and CXL Downstream Switch Ports
> inorder to notify the associated Root Port and OS.[1]
> 
> Export the AER service driver's pci_aer_unmask_internal_errors() function
> to CXL namespace.
> 
> Remove the function's dependency on the CONFIG_PCIEAER_CXL kernel config
> because it is now an exported function.
> 
> Call pci_aer_unmask_internal_errors() during RAS initialization in:
> cxl_uport_init_ras_reporting() and cxl_dport_init_ras_reporting().
> 
> [1] PCIe Base Spec r6.2-1.0, 6.2.3.2.2 Masking Individual Errors
> 
> Signed-off-by: Terry Bowman <terry.bowman@....com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

I'd say this is really a CXL-centric change, given that
pci_aer_unmask_internal_errors() is only used for CXL and it's
exported in the CXL namespace.  So I would use

  cxl/pci: ...

in the subject.

> ---
>  drivers/cxl/core/pci.c | 2 ++
>  drivers/pci/pcie/aer.c | 3 ++-
>  include/linux/aer.h    | 1 +
>  3 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
> index 03ae21a944e0..36e686a31045 100644
> --- a/drivers/cxl/core/pci.c
> +++ b/drivers/cxl/core/pci.c
> @@ -912,6 +912,7 @@ void cxl_uport_init_ras_reporting(struct cxl_port *port)
>  
>  	cxl_assign_port_error_handlers(pdev);
>  	devm_add_action_or_reset(&port->dev, cxl_clear_port_error_handlers, pdev);
> +	pci_aer_unmask_internal_errors(pdev);
>  }
>  EXPORT_SYMBOL_NS_GPL(cxl_uport_init_ras_reporting, "CXL");
>  
> @@ -959,6 +960,7 @@ void cxl_dport_init_ras_reporting(struct cxl_dport *dport)
>  	cxl_assign_port_error_handlers(pdev);
>  	devm_add_action_or_reset(&port->dev, cxl_clear_port_error_handlers, pdev);
>  	put_device(&port->dev);
> +	pci_aer_unmask_internal_errors(pdev);
>  }
>  EXPORT_SYMBOL_NS_GPL(cxl_dport_init_ras_reporting, "CXL");
>  
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index ee38db08d005..8e3a60411610 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -948,7 +948,7 @@ static bool find_source_device(struct pci_dev *parent,
>   * Note: AER must be enabled and supported by the device which must be
>   * checked in advance, e.g. with pcie_aer_is_native().
>   */
> -static void pci_aer_unmask_internal_errors(struct pci_dev *dev)
> +void pci_aer_unmask_internal_errors(struct pci_dev *dev)
>  {
>  	int aer = dev->aer_cap;
>  	u32 mask;
> @@ -961,6 +961,7 @@ static void pci_aer_unmask_internal_errors(struct pci_dev *dev)
>  	mask &= ~PCI_ERR_COR_INTERNAL;
>  	pci_write_config_dword(dev, aer + PCI_ERR_COR_MASK, mask);
>  }
> +EXPORT_SYMBOL_NS_GPL(pci_aer_unmask_internal_errors, "CXL");
>  
>  static bool is_cxl_mem_dev(struct pci_dev *dev)
>  {
> diff --git a/include/linux/aer.h b/include/linux/aer.h
> index 947b63091902..a54545796edc 100644
> --- a/include/linux/aer.h
> +++ b/include/linux/aer.h
> @@ -61,5 +61,6 @@ void pci_print_aer(struct pci_dev *dev, int aer_severity,
>  int cper_severity_to_aer(int cper_severity);
>  void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
>  		       int severity, struct aer_capability_regs *aer_regs);
> +void pci_aer_unmask_internal_errors(struct pci_dev *dev);
>  #endif //_AER_H_
>  
> -- 
> 2.34.1
>