linux-kernel - Re: [PATCH V4 1/9] PCI/CXL: Export native CXL error reporting control

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Date:   Fri, 16 Dec 2022 14:09:47 +0000
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     <ira.weiny@...el.com>
CC:     Dan Williams <dan.j.williams@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lukas Wunner <lukas@...ner.de>, <linux-pci@...r.kernel.org>,
        <linux-acpi@...r.kernel.org>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Dave Jiang <dave.jiang@...el.com>,
        <linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>
Subject: Re: [PATCH V4 1/9] PCI/CXL: Export native CXL error reporting
 control

On Sun, 11 Dec 2022 23:06:19 -0800
ira.weiny@...el.com wrote:

> From: Ira Weiny <ira.weiny@...el.com>
> 
> CXL _OSC Error Reporting Control is used by the OS to determine if
> Firmware has control of various CXL error reporting capabilities
> including the event logs.
> 
> Expose the result of negotiating CXL Error Reporting Control in struct
> pci_host_bridge for consumption by the CXL drivers.
> 
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Lukas Wunner <lukas@...ner.de>
> Cc: linux-pci@...r.kernel.org
> Cc: linux-acpi@...r.kernel.org
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> 
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
> Changes from V3:
> 	New patch split out
> ---
>  drivers/acpi/pci_root.c | 3 +++
>  drivers/pci/probe.c     | 1 +
>  include/linux/pci.h     | 1 +
>  3 files changed, 5 insertions(+)
> 
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index b3c202d2a433..84030804a763 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -1047,6 +1047,9 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
>  	if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL))
>  		host_bridge->native_dpc = 0;
>  
> +	if (!(root->osc_ext_control_set & OSC_CXL_ERROR_REPORTING_CONTROL))
> +		host_bridge->native_cxl_error = 0;
> +
>  	/*
>  	 * Evaluate the "PCI Boot Configuration" _DSM Function.  If it
>  	 * exists and returns 0, we must preserve any PCI resource
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 2f4e88a44e8b..34c9fd6840c4 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -596,6 +596,7 @@ static void pci_init_host_bridge(struct pci_host_bridge *bridge)
>  	bridge->native_ltr = 1;
>  	bridge->native_dpc = 1;
>  	bridge->domain_nr = PCI_DOMAIN_NR_NOT_SET;
> +	bridge->native_cxl_error = 1;
>  
>  	device_initialize(&bridge->dev);
>  }
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 1f81807492ef..08c3ccd2617b 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -577,6 +577,7 @@ struct pci_host_bridge {
>  	unsigned int	native_pme:1;		/* OS may use PCIe PME */
>  	unsigned int	native_ltr:1;		/* OS may use PCIe LTR */
>  	unsigned int	native_dpc:1;		/* OS may use PCIe DPC */
> +	unsigned int	native_cxl_error:1;	/* OS may use CXL RAS/Events */
>  	unsigned int	preserve_config:1;	/* Preserve FW resource setup */
>  	unsigned int	size_windows:1;		/* Enable root bus sizing */
>  	unsigned int	msi_domain:1;		/* Bridge wants MSI domain */