linux-kernel - Re: [PATCH v4 11/23] cxl/port: Store the downstream port's Component Register mappings in struct cxl

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Message-ID: <20230601140701.00005e78@Huawei.com>
Date:   Thu, 1 Jun 2023 14:07:01 +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 11/23] cxl/port: Store the downstream port's
 Component Register mappings in struct cxl_dport

On Tue, 23 May 2023 18:22:02 -0500
Terry Bowman <terry.bowman@....com> wrote:

> From: Robert Richter <rrichter@....com>
> 
> Same as for ports, also store the downstream port's Component Register
> mappings, use struct cxl_dport for that.
> 
> Signed-off-by: Robert Richter <rrichter@....com>
> Signed-off-by: Terry Bowman <terry.bowman@....com>
Seems reasonable to me.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
>  drivers/cxl/core/port.c | 11 +++++++++++
>  drivers/cxl/cxl.h       |  2 ++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
> index 34e929f1723b..db2ba0c886e2 100644
> --- a/drivers/cxl/core/port.c
> +++ b/drivers/cxl/core/port.c
> @@ -708,6 +708,13 @@ static inline int cxl_port_setup_regs(struct cxl_port *port,
>  				   component_reg_phys);
>  }
>  
> +static inline int cxl_dport_setup_regs(struct cxl_dport *dport,
> +				       resource_size_t component_reg_phys)
> +{
> +	return cxl_setup_comp_regs(dport->dev, &dport->comp_map,
> +				   component_reg_phys);
> +}
> +
>  static struct cxl_port *__devm_cxl_add_port(struct device *host,
>  					    struct device *uport,
>  					    resource_size_t component_reg_phys,
> @@ -986,6 +993,10 @@ __devm_cxl_add_dport(struct cxl_port *port, struct device *dport_dev,
>  	dport->port = port;
>  	dport->rcrb.base = rcrb;
>  
> +	rc = cxl_dport_setup_regs(dport, component_reg_phys);
> +	if (rc && rc != -ENODEV)
> +		return ERR_PTR(rc);
> +
>  	cond_cxl_root_lock(port);
>  	rc = add_dport(port, dport);
>  	cond_cxl_root_unlock(port);
> diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
> index c76e1f84ba61..dc83c1d0396e 100644
> --- a/drivers/cxl/cxl.h
> +++ b/drivers/cxl/cxl.h
> @@ -601,6 +601,7 @@ struct cxl_rcrb_info {
>   * struct cxl_dport - CXL downstream port
>   * @dev: PCI bridge or firmware device representing the downstream link
>   * @port: reference to cxl_port that contains this downstream port
> + * @comp_map: component register capability mappings
>   * @port_id: unique hardware identifier for dport in decoder target list
>   * @component_reg_phys: downstream port component registers
>   * @rch: Indicate whether this dport was enumerated in RCH or VH mode
> @@ -609,6 +610,7 @@ struct cxl_rcrb_info {
>  struct cxl_dport {
>  	struct device *dev;
>  	struct cxl_port *port;
> +	struct cxl_register_map comp_map;
>  	int port_id;
>  	resource_size_t component_reg_phys;
>  	bool rch;