linux-kernel - Re: [PATCH v6 09/27] cxl/acpi: Move add_host_bridge_uport() after cxl_get

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Date:   Thu, 22 Jun 2023 16:17:55 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     Terry Bowman <terry.bowman@....com>, <alison.schofield@...el.com>,
        <vishal.l.verma@...el.com>, <ira.weiny@...el.com>,
        <bwidawsk@...nel.org>, <dan.j.williams@...el.com>,
        <Jonathan.Cameron@...wei.com>, <linux-cxl@...r.kernel.org>
CC:     <rrichter@....com>, <linux-kernel@...r.kernel.org>,
        <bhelgaas@...gle.com>
Subject: Re: [PATCH v6 09/27] cxl/acpi: Move add_host_bridge_uport() after
 cxl_get_chbs()



On 6/21/23 20:51, Terry Bowman 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>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Reviewed-by: Dave Jiang <dave.jiang@...el.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 70cd9ac73a8b..0c975ee684b0 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;
> -}
> -
>   /* Note, @dev is used by mock_acpi_table_parse_cedt() */
>   struct cxl_chbs_context {
>   	struct device *dev;
> @@ -467,6 +422,51 @@ 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;