linux-kernel - Re: [PATCH v7 01/17] PCI/AER: Introduce 'struct cxl_err_handlers' and add to 'struct pci

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Message-ID: <20250211202551.GA53774@bhelgaas>
Date: Tue, 11 Feb 2025 14:25:51 -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 01/17] PCI/AER: Introduce 'struct cxl_err_handlers'
 and add to 'struct pci_driver'

On Tue, Feb 11, 2025 at 01:24:28PM -0600, Terry Bowman wrote:
> CXL.io is implemented on top of PCIe Protocol Errors. But, CXL.io and PCIe
> have different handling requirements for uncorrectable errors (UCE).
> 
> The PCIe AER service driver may attempt recovering PCIe devices with
> UCE while recovery is not used for CXL.io. Recovery is not used in the
> CXL.io case because of potential corruption on what can be system memory.
> 
> Create pci_driver::cxl_err_handlers structure similar to
> pci_driver::error_handler. Create handlers for correctable and
> uncorrectable CXL.io error handling.
> 
> The CXL error handlers will be used in future patches adding CXL PCIe
> Port Protocol Error handling.
> 
> Signed-off-by: Terry Bowman <terry.bowman@....com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> Reviewed-by: Fan Ni <fan.ni@...sung.com>
> Reviewed-by: Ira Weiny <ira.weiny@...el.com>
> Reviewed-by: Gregory Price <gourry@...rry.net>

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

> ---
>  include/linux/pci.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 47b31ad724fa..1d62e785ae1f 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -884,6 +884,14 @@ struct pci_error_handlers {
>  	void (*cor_error_detected)(struct pci_dev *dev);
>  };
>  
> +/* Compute Express Link (CXL) bus error event callbacks */
> +struct cxl_error_handlers {
> +	/* CXL bus error detected on this device */
> +	pci_ers_result_t (*error_detected)(struct pci_dev *dev);
> +
> +	/* Allow device driver to record more details of a correctable error */
> +	void (*cor_error_detected)(struct pci_dev *dev);
> +};
>  
>  struct module;
>  
> @@ -929,6 +937,7 @@ struct module;
>   * @sriov_get_vf_total_msix: PF driver callback to get the total number of
>   *              MSI-X vectors available for distribution to the VFs.
>   * @err_handler: See Documentation/PCI/pci-error-recovery.rst
> + * @cxl_err_handler: Compute Express Link specific error handlers.
>   * @groups:	Sysfs attribute groups.
>   * @dev_groups: Attributes attached to the device that will be
>   *              created once it is bound to the driver.
> @@ -954,6 +963,7 @@ struct pci_driver {
>  	int  (*sriov_set_msix_vec_count)(struct pci_dev *vf, int msix_vec_count); /* On PF */
>  	u32  (*sriov_get_vf_total_msix)(struct pci_dev *pf);
>  	const struct pci_error_handlers *err_handler;
> +	const struct cxl_error_handlers *cxl_err_handler;
>  	const struct attribute_group **groups;
>  	const struct attribute_group **dev_groups;
>  	struct device_driver	driver;
> -- 
> 2.34.1
>