linux-kernel - Re: [PATCH v5 1/3] cxl/core: Introduce a new helper cxl_resource_contains

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Message-ID: <64fcf4b7-b5c1-4983-b4e3-c490a461e8a0@zohomail.com>
Date: Fri, 11 Jul 2025 11:19:08 +0800
From: Li Ming <ming.li@...omail.com>
To: linux-cxl@...r.kernel.org
Cc: andriy.shevchenko@...ux.intel.com, linux-kernel@...r.kernel.org,
 dave@...olabs.net, jonathan.cameron@...wei.com, dave.jiang@...el.com,
 alison.schofield@...el.com, vishal.l.verma@...el.com, ira.weiny@...el.com,
 dan.j.williams@...el.com, shiju.jose@...wei.com
Subject: Re: [PATCH v5 1/3] cxl/core: Introduce a new helper
 cxl_resource_contains_addr()

On 7/11/2025 11:10 AM, Li Ming wrote:
> In CXL subsystem, many functions need to check an address availability
> by checking if the resource range contains the address. Providing a new
> helper function cxl_resource_contains_addr() to check if the resource
> range contains the input address.
>
> Suggested-by: Alison Schofield <alison.schofield@...el.com>
> Signed-off-by: Li Ming <ming.li@...omail.com>
> Tested-by: Shiju Jose <shiju.jose@...wei.com>
> Reviewed-by: Alison Schofield <alison.schofield@...el.com>

I added a wrong reviewed-by tag here, it should be for Andy not Alison, Will send another version to fix it.


Ming

> Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> ---
>  drivers/cxl/core/core.h | 1 +
>  drivers/cxl/core/hdm.c  | 7 +++++++
>  2 files changed, 8 insertions(+)
>
> diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h
> index 29b61828a847..6b78b10da3e1 100644
> --- a/drivers/cxl/core/core.h
> +++ b/drivers/cxl/core/core.h
> @@ -80,6 +80,7 @@ int cxl_dpa_alloc(struct cxl_endpoint_decoder *cxled, u64 size);
>  int cxl_dpa_free(struct cxl_endpoint_decoder *cxled);
>  resource_size_t cxl_dpa_size(struct cxl_endpoint_decoder *cxled);
>  resource_size_t cxl_dpa_resource_start(struct cxl_endpoint_decoder *cxled);
> +bool cxl_resource_contains_addr(const struct resource *res, const resource_size_t addr);
>  
>  enum cxl_rcrb {
>  	CXL_RCRB_DOWNSTREAM,
> diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
> index ab1007495f6b..088caa6b6f74 100644
> --- a/drivers/cxl/core/hdm.c
> +++ b/drivers/cxl/core/hdm.c
> @@ -547,6 +547,13 @@ resource_size_t cxl_dpa_resource_start(struct cxl_endpoint_decoder *cxled)
>  	return base;
>  }
>  
> +bool cxl_resource_contains_addr(const struct resource *res, const resource_size_t addr)
> +{
> +	struct resource _addr = DEFINE_RES_MEM(addr, 1);
> +
> +	return resource_contains(res, &_addr);
> +}
> +
>  int cxl_dpa_free(struct cxl_endpoint_decoder *cxled)
>  {
>  	struct cxl_port *port = cxled_to_port(cxled);