linux-kernel - Re: [PATCH v6 17/27] cxl/pci: Store the endpoint's Component Register mappings in struct cxl_dev

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Date:   Thu, 22 Jun 2023 17:02:33 -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 17/27] cxl/pci: Store the endpoint's Component Register
 mappings in struct cxl_dev_state



On 6/21/23 20:51, Terry Bowman wrote:
> From: Robert Richter <rrichter@....com>
> 
> Same as for ports and dports, also store the endpoint's Component
> Register mappings, use struct cxl_dev_state for that.
> 
> 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>

Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> ---
>   drivers/cxl/cxlmem.h         |  5 ++---
>   drivers/cxl/mem.c            |  4 ++--
>   drivers/cxl/pci.c            | 10 ++++------
>   tools/testing/cxl/test/mem.c |  1 -
>   4 files changed, 8 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
> index 76743016b64c..8aee1a42d9af 100644
> --- a/drivers/cxl/cxlmem.h
> +++ b/drivers/cxl/cxlmem.h
> @@ -263,6 +263,7 @@ struct cxl_poison_state {
>    *
>    * @dev: The device associated with this CXL state
>    * @cxlmd: The device representing the CXL.mem capabilities of @dev
> + * @comp_map: component register capability mappings
>    * @regs: Parsed register blocks
>    * @cxl_dvsec: Offset to the PCIe device DVSEC
>    * @rcd: operating in RCD mode (CXL 3.0 9.11.8 CXL Devices Attached to an RCH)
> @@ -286,7 +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
> @@ -299,7 +299,7 @@ struct cxl_poison_state {
>   struct cxl_dev_state {
>   	struct device *dev;
>   	struct cxl_memdev *cxlmd;
> -
> +	struct cxl_register_map comp_map;
>   	struct cxl_regs regs;
>   	int cxl_dvsec;
>   
> @@ -325,7 +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 205e2e280aed..92c6151b7206 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 99a75c54ee39..ad4cfcd95e17 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c
> @@ -665,16 +665,14 @@ 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, &map);
> +	rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_COMPONENT,
> +				&cxlds->comp_map);
>   	if (rc)
>   		dev_warn(&pdev->dev, "No component registers (%d)\n", rc);
> -	else if (!map.component_map.ras.valid)
> +	else if (!cxlds->comp_map.component_map.ras.valid)
>   		dev_dbg(&pdev->dev, "RAS registers not found\n");
>   
> -	cxlds->component_reg_phys = map.resource;
> -
> -	rc = cxl_map_component_regs(&map, &cxlds->regs.component,
> +	rc = cxl_map_component_regs(&cxlds->comp_map, &cxlds->regs.component,
>   				    BIT(CXL_CM_CAP_CAP_ID_RAS));
>   	if (rc)
>   		dev_dbg(&pdev->dev, "Failed to map RAS capability.\n");
> diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c
> index 34b48027b3de..fd562a5fa06f 100644
> --- a/tools/testing/cxl/test/mem.c
> +++ b/tools/testing/cxl/test/mem.c
> @@ -1241,7 +1241,6 @@ static int cxl_mock_mem_probe(struct platform_device *pdev)
>   	cxlds->event.buf = (struct cxl_get_event_payload *) mdata->event_buf;
>   	if (is_rcd(pdev)) {
>   		cxlds->rcd = true;
> -		cxlds->component_reg_phys = CXL_RESOURCE_NONE;
>   	}
>   
>   	rc = cxl_enumerate_cmds(cxlds);