linux-kernel - Re: [PATCH v4 16/23] cxl/pci: Remove Component Register base address from struct cxl_dev

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Date:   Thu, 1 Jun 2023 14:28:44 +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 16/23] cxl/pci: Remove Component Register base
 address from struct cxl_dev_state

On Tue, 23 May 2023 18:22:07 -0500
Terry Bowman <terry.bowman@....com> wrote:

> From: Robert Richter <rrichter@....com>
> 
> The Component Register base address @component_reg_phys is no longer
> used after the rework of the Component Register setup which now uses
> struct member @comp_map instead. Remove the base address.
> 
> Signed-off-by: Robert Richter <rrichter@....com>
> Signed-off-by: Terry Bowman <terry.bowman@....com>

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

> ---
>  drivers/cxl/cxlmem.h | 2 --
>  drivers/cxl/mem.c    | 4 ++--
>  drivers/cxl/pci.c    | 3 ---
>  3 files changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
> index 2823c5aaf3db..7b5b2d3187bf 100644
> --- a/drivers/cxl/cxlmem.h
> +++ b/drivers/cxl/cxlmem.h
> @@ -287,7 +287,6 @@ struct cxl_poison_state {
>   * @active_persistent_bytes: sum of hard + soft persistent
>   * @next_volatile_bytes: volatile capacity change pending device reset
>   * @next_persistent_bytes: persistent capacity change pending device reset
> - * @component_reg_phys: register base of component registers
>   * @info: Cached DVSEC information about the device.
>   * @serial: PCIe Device Serial Number
>   * @event: event log driver state
> @@ -326,7 +325,6 @@ struct cxl_dev_state {
>  	u64 next_volatile_bytes;
>  	u64 next_persistent_bytes;
>  
> -	resource_size_t component_reg_phys;
>  	u64 serial;
>  
>  	struct cxl_event_state event;
> diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c
> index 0643852444f3..618e839919eb 100644
> --- a/drivers/cxl/mem.c
> +++ b/drivers/cxl/mem.c
> @@ -49,7 +49,6 @@ static int devm_cxl_add_endpoint(struct device *host, struct cxl_memdev *cxlmd,
>  				 struct cxl_dport *parent_dport)
>  {
>  	struct cxl_port *parent_port = parent_dport->port;
> -	struct cxl_dev_state *cxlds = cxlmd->cxlds;
>  	struct cxl_port *endpoint, *iter, *down;
>  	int rc;
>  
> @@ -65,8 +64,9 @@ static int devm_cxl_add_endpoint(struct device *host, struct cxl_memdev *cxlmd,
>  		ep->next = down;
>  	}
>  
> +	/* The Endpoint's component regs are located in cxlds. */
>  	endpoint = devm_cxl_add_port(host, &cxlmd->dev,
> -				     cxlds->component_reg_phys,
> +				     CXL_RESOURCE_NONE,
>  				     parent_dport);
>  	if (IS_ERR(endpoint))
>  		return PTR_ERR(endpoint);
> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
> index 00983770ea7b..0db71493db5d 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c
> @@ -661,7 +661,6 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  	 * If the component registers can't be found, the cxl_pci driver may
>  	 * still be useful for management functions so don't return an error.
>  	 */
> -	cxlds->component_reg_phys = CXL_RESOURCE_NONE;
>  	rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_COMPONENT,
>  				&cxlds->comp_map);
>  	if (rc)
> @@ -669,8 +668,6 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  	else if (!cxlds->comp_map.component_map.ras.valid)
>  		dev_dbg(&pdev->dev, "RAS registers not found\n");
>  
> -	cxlds->component_reg_phys = cxlds->comp_map.resource;
> -
>  	rc = cxl_map_component_regs(&cxlds->comp_map, &cxlds->regs.component,
>  				    BIT(CXL_CM_CAP_CAP_ID_RAS));
>  	if (rc)