linux-kernel - Re: [PATCH v4 06/23] cxl/acpi: Moving add_host_bridge

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Message-ID: <20230601115447.000055e6@Huawei.com>
Date:   Thu, 1 Jun 2023 11:54:47 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Terry Bowman <terry.bowman@....com>
CC:     <alison.schofield@...el.com>, <vishal.l.verma@...el.com>,
        <ira.weiny@...el.com>, <bwidawsk@...nel.org>,
        <dan.j.williams@...el.com>, <dave.jiang@...el.com>,
        <linux-cxl@...r.kernel.org>, <rrichter@....com>,
        <linux-kernel@...r.kernel.org>, <bhelgaas@...gle.com>
Subject: Re: [PATCH v4 06/23] cxl/acpi: Moving add_host_bridge_uport()
 around

On Tue, 23 May 2023 18:21:57 -0500
Terry Bowman <terry.bowman@....com> wrote:

> From: Robert Richter <rrichter@....com>
> 
> Just moving code to reorder functions to later share cxl_get_chbs()
> with add_host_bridge_uport().
> 
> This makes changes in the next patch visible. No other changes at all.
> 
> Signed-off-by: Robert Richter <rrichter@....com>
> Signed-off-by: Terry Bowman <terry.bowman@....com>
Given it's just a move FWIW

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
>  drivers/cxl/acpi.c | 90 +++++++++++++++++++++++-----------------------
>  1 file changed, 45 insertions(+), 45 deletions(-)
> 
> diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
> index 39227070da9b..4fd9fe32f830 100644
> --- a/drivers/cxl/acpi.c
> +++ b/drivers/cxl/acpi.c
> @@ -327,51 +327,6 @@ __mock struct acpi_device *to_cxl_host_bridge(struct device *host,
>  	return NULL;
>  }
>  
> -/*
> - * A host bridge is a dport to a CFMWS decode and it is a uport to the
> - * dport (PCIe Root Ports) in the host bridge.
> - */
> -static int add_host_bridge_uport(struct device *match, void *arg)
> -{
> -	struct cxl_port *root_port = arg;
> -	struct device *host = root_port->dev.parent;
> -	struct acpi_device *hb = to_cxl_host_bridge(host, match);
> -	struct acpi_pci_root *pci_root;
> -	struct cxl_dport *dport;
> -	struct cxl_port *port;
> -	struct device *bridge;
> -	int rc;
> -
> -	if (!hb)
> -		return 0;
> -
> -	pci_root = acpi_pci_find_root(hb->handle);
> -	bridge = pci_root->bus->bridge;
> -	dport = cxl_find_dport_by_dev(root_port, bridge);
> -	if (!dport) {
> -		dev_dbg(host, "host bridge expected and not found\n");
> -		return 0;
> -	}
> -
> -	if (dport->rch) {
> -		dev_info(bridge, "host supports CXL (restricted)\n");
> -		return 0;
> -	}
> -
> -	rc = devm_cxl_register_pci_bus(host, bridge, pci_root->bus);
> -	if (rc)
> -		return rc;
> -
> -	port = devm_cxl_add_port(host, bridge, dport->component_reg_phys,
> -				 dport);
> -	if (IS_ERR(port))
> -		return PTR_ERR(port);
> -
> -	dev_info(bridge, "host supports CXL\n");
> -
> -	return 0;
> -}
> -
>  struct cxl_chbs_context {
>  	unsigned long long uid;
>  	resource_size_t base;
> @@ -464,6 +419,51 @@ static int add_host_bridge_dport(struct device *match, void *arg)
>  	return 0;
>  }
>  
> +/*
> + * A host bridge is a dport to a CFMWS decode and it is a uport to the
> + * dport (PCIe Root Ports) in the host bridge.
> + */
> +static int add_host_bridge_uport(struct device *match, void *arg)
> +{
> +	struct cxl_port *root_port = arg;
> +	struct device *host = root_port->dev.parent;
> +	struct acpi_device *hb = to_cxl_host_bridge(host, match);
> +	struct acpi_pci_root *pci_root;
> +	struct cxl_dport *dport;
> +	struct cxl_port *port;
> +	struct device *bridge;
> +	int rc;
> +
> +	if (!hb)
> +		return 0;
> +
> +	pci_root = acpi_pci_find_root(hb->handle);
> +	bridge = pci_root->bus->bridge;
> +	dport = cxl_find_dport_by_dev(root_port, bridge);
> +	if (!dport) {
> +		dev_dbg(host, "host bridge expected and not found\n");
> +		return 0;
> +	}
> +
> +	if (dport->rch) {
> +		dev_info(bridge, "host supports CXL (restricted)\n");
> +		return 0;
> +	}
> +
> +	rc = devm_cxl_register_pci_bus(host, bridge, pci_root->bus);
> +	if (rc)
> +		return rc;
> +
> +	port = devm_cxl_add_port(host, bridge, dport->component_reg_phys,
> +				 dport);
> +	if (IS_ERR(port))
> +		return PTR_ERR(port);
> +
> +	dev_info(bridge, "host supports CXL\n");
> +
> +	return 0;
> +}
> +
>  static int add_root_nvdimm_bridge(struct device *match, void *data)
>  {
>  	struct cxl_decoder *cxld;