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

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Message-Id: <20250710065647.98094-2-ming.li@zohomail.com>
Date: Thu, 10 Jul 2025 14:56:45 +0800
From: Li Ming <ming.li@...omail.com>
To: 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
Cc: andriy.shevchenko@...ux.intel.com,
	linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Li Ming <ming.li@...omail.com>
Subject: [PATCH v4 1/3] 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@...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>
---
 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