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

[Li Ming <ming.li@zohomail.com>]

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>
---
 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);
-- 
2.34.1