cxl/mem: Drop @host argument to devm_cxl_add_memdev()

In all cases the device that created the 'struct cxl_dev_state' instance is
also the device to host the devm cleanup of devm_cxl_add_memdev(). This
simplifies the function prototype, and limits a degree of freedom of the
API.

Cc: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Ben Cheatham <benjamin.cheatham@amd.com>
Tested-by: Alejandro Lucero <alucerop@amd.com>
Link: https://patch.msgid.link/20251216005616.3090129-6-dan.j.williams@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

Author: djbw

drivers/cxl/core/memdev.c

@@ -1093,8 +1093,7 @@ static struct cxl_memdev *cxl_memdev_autoremove(struct cxl_memdev *cxlmd)
  * Core helper for devm_cxl_add_memdev() that wants to both create a device and
  * assert to the caller that upon return cxl_mem::probe() has been invoked.
  */
-struct cxl_memdev *__devm_cxl_add_memdev(struct device *host,
-					 struct cxl_dev_state *cxlds)
+struct cxl_memdev *__devm_cxl_add_memdev(struct cxl_dev_state *cxlds)
 {
 	struct device *dev;
 	int rc;

drivers/cxl/cxlmem.h

@@ -95,10 +95,8 @@ static inline bool is_cxl_endpoint(struct cxl_port *port)
 	return is_cxl_memdev(port->uport_dev);
 }
 
-struct cxl_memdev *__devm_cxl_add_memdev(struct device *host,
-					 struct cxl_dev_state *cxlds);
-struct cxl_memdev *devm_cxl_add_memdev(struct device *host,
-				       struct cxl_dev_state *cxlds);
+struct cxl_memdev *__devm_cxl_add_memdev(struct cxl_dev_state *cxlds);
+struct cxl_memdev *devm_cxl_add_memdev(struct cxl_dev_state *cxlds);
 int devm_cxl_sanitize_setup_notifier(struct device *host,
 				     struct cxl_memdev *cxlmd);
 struct cxl_memdev_state;

drivers/cxl/mem.c

@@ -165,17 +165,18 @@ static int cxl_mem_probe(struct device *dev)
 
 /**
  * devm_cxl_add_memdev - Add a CXL memory device
- * @host: devres alloc/release context and parent for the memdev
  * @cxlds: CXL device state to associate with the memdev
  *
  * Upon return the device will have had a chance to attach to the
  * cxl_mem driver, but may fail if the CXL topology is not ready
  * (hardware CXL link down, or software platform CXL root not attached)
+ *
+ * The parent of the resulting device and the devm context for allocations is
+ * @cxlds->dev.
  */
-struct cxl_memdev *devm_cxl_add_memdev(struct device *host,
-				       struct cxl_dev_state *cxlds)
+struct cxl_memdev *devm_cxl_add_memdev(struct cxl_dev_state *cxlds)
 {
-	return __devm_cxl_add_memdev(host, cxlds);
+	return __devm_cxl_add_memdev(cxlds);
 }
 EXPORT_SYMBOL_NS_GPL(devm_cxl_add_memdev, "CXL");
 

drivers/cxl/pci.c

@@ -1006,7 +1006,7 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (rc)
 		dev_dbg(&pdev->dev, "No CXL Features discovered\n");
 
-	cxlmd = devm_cxl_add_memdev(&pdev->dev, cxlds);
+	cxlmd = devm_cxl_add_memdev(cxlds);
 	if (IS_ERR(cxlmd))
 		return PTR_ERR(cxlmd);
 

tools/testing/cxl/test/mem.c

@@ -1767,7 +1767,7 @@ static int cxl_mock_mem_probe(struct platform_device *pdev)
 
 	cxl_mock_add_event_logs(&mdata->mes);
 
-	cxlmd = devm_cxl_add_memdev(&pdev->dev, cxlds);
+	cxlmd = devm_cxl_add_memdev(cxlds);
 	if (IS_ERR(cxlmd))
 		return PTR_ERR(cxlmd);