linux-kernel - Re: [PATCH v4 1/3] cxl/core: Introduce a new helper cxl_resource_contains

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <e2ee3643-1592-4c85-8f59-82ba81bbe0c7@intel.com>
Date: Thu, 10 Jul 2025 16:29:10 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Li Ming <ming.li@...omail.com>, dave@...olabs.net,
 jonathan.cameron@...wei.com, alison.schofield@...el.com,
 vishal.l.verma@...el.com, ira.weiny@...el.com, dan.j.williams@...el.com,
 shiju.jose@...wei.com
Cc: andriy.shevchenko@...ux.intel.com, linux-cxl@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/3] cxl/core: Introduce a new helper
 cxl_resource_contains_addr()



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@...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>
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);