Re: [PATCH v4 1/3] cxl/core: Introduce a new helper cxl_resource_contains_addr()

[Dave Jiang <dave.jiang@intel.com>]

On 7/9/25 11:56 PM, 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@intel.com>
> Signed-off-by: Li Ming <ming.li@zohomail.com>
> Tested-by: Shiju Jose <shiju.jose@huawei.com>
> Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.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);