linux-kernel - [PATCH v3 1/3] cxl/core: Introduce a new helper resource_contains

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Message-Id: <20250708051536.92119-2-ming.li@zohomail.com>
Date: Tue,  8 Jul 2025 13:15:34 +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 v3 1/3] cxl/core: Introduce a new helper 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 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>
---
 drivers/cxl/core/core.h | 1 +
 drivers/cxl/core/hdm.c  | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h
index 29b61828a847..3798e9047175 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 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..701a6a3baa6a 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -547,6 +547,14 @@ resource_size_t cxl_dpa_resource_start(struct cxl_endpoint_decoder *cxled)
 	return base;
 }
 
+bool resource_contains_addr(const struct resource *res, const resource_size_t addr)
+{
+	if (res->flags & IORESOURCE_MEM)
+		return res->start <= addr && addr <= res->end;
+
+	return false;
+}
+
 int cxl_dpa_free(struct cxl_endpoint_decoder *cxled)
 {
 	struct cxl_port *port = cxled_to_port(cxled);
-- 
2.34.1