cxl/core: Introduce a new helper cxl_resource_contains_addr()

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: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://patch.msgid.link/20250711032357.127355-2-ming.li@zohomail.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

Author: liming011

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,

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);