cxl: Unify debug messages when calling devm_cxl_add_dport()

CXL dports are added in a couple of code paths using
devm_cxl_add_dport(). Debug messages are individually generated, but are
incomplete and inconsistent. Change this by moving its generation to
devm_cxl_add_dport(). This unifies the messages and reduces code
duplication.  Also, generate messages on failure. Use a
__devm_cxl_add_dport() wrapper to keep the readability of the error
exits.
Signed-off-by: Robert Richter <rrichter@amd.com>
Link: https://lore.kernel.org/r/20221018132341.76259-5-rrichter@amd.comSigned-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/cxl/acpi.c

@@ -282,12 +282,9 @@ static int add_host_bridge_dport(struct device *match, void *arg)
 	}
 
 	dport = devm_cxl_add_dport(root_port, match, uid, ctx.chbcr);
-	if (IS_ERR(dport)) {
-		dev_err(host, "failed to add downstream port: %s\n",
-			dev_name(match));
+	if (IS_ERR(dport))
 		return PTR_ERR(dport);
-	}
-	dev_dbg(host, "add dport%llu: %s\n", uid, dev_name(match));
+
 	return 0;
 }
 

drivers/cxl/core/pci.c

@@ -62,8 +62,6 @@ static int match_add_dports(struct pci_dev *pdev, void *data)
 	}
 	ctx->count++;
 
-	dev_dbg(&port->dev, "add dport%d: %s\n", port_num, dev_name(&pdev->dev));
-
 	return 0;
 }
 

drivers/cxl/core/port.c

@@ -899,20 +899,10 @@ static void cxl_dport_unlink(void *data)
 	sysfs_remove_link(&port->dev.kobj, link_name);
 }
 
-/**
- * devm_cxl_add_dport - append downstream port data to a cxl_port
- * @port: the cxl_port that references this dport
- * @dport_dev: firmware or PCI device representing the dport
- * @port_id: identifier for this dport in a decoder's target list
- * @component_reg_phys: optional location of CXL component registers
- *
- * Note that dports are appended to the devm release action's of the
- * either the port's host (for root ports), or the port itself (for
- * switch ports)
- */
-struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port,
-				     struct device *dport_dev, int port_id,
-				     resource_size_t component_reg_phys)
+static struct cxl_dport *__devm_cxl_add_dport(struct cxl_port *port,
+					      struct device *dport_dev,
+					      int port_id,
+					      resource_size_t component_reg_phys)
 {
 	char link_name[CXL_TARGET_STRLEN];
 	struct cxl_dport *dport;
@@ -964,6 +954,36 @@ struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port,
 
 	return dport;
 }
+
+/**
+ * devm_cxl_add_dport - append downstream port data to a cxl_port
+ * @port: the cxl_port that references this dport
+ * @dport_dev: firmware or PCI device representing the dport
+ * @port_id: identifier for this dport in a decoder's target list
+ * @component_reg_phys: optional location of CXL component registers
+ *
+ * Note that dports are appended to the devm release action's of the
+ * either the port's host (for root ports), or the port itself (for
+ * switch ports)
+ */
+struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port,
+				     struct device *dport_dev, int port_id,
+				     resource_size_t component_reg_phys)
+{
+	struct cxl_dport *dport;
+
+	dport = __devm_cxl_add_dport(port, dport_dev, port_id,
+				     component_reg_phys);
+	if (IS_ERR(dport)) {
+		dev_dbg(dport_dev, "failed to add dport to %s: %ld\n",
+			dev_name(&port->dev), PTR_ERR(dport));
+	} else {
+		dev_dbg(dport_dev, "dport added to %s\n",
+			dev_name(&port->dev));
+	}
+
+	return dport;
+}
 EXPORT_SYMBOL_NS_GPL(devm_cxl_add_dport, CXL);
 
 static int add_ep(struct cxl_ep *new)

tools/testing/cxl/test/cxl.c

@@ -634,7 +634,6 @@ static int mock_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm)
 
 static int mock_cxl_port_enumerate_dports(struct cxl_port *port)
 {
-	struct device *dev = &port->dev;
 	struct platform_device **array;
 	int i, array_size;
 
@@ -684,14 +683,8 @@ static int mock_cxl_port_enumerate_dports(struct cxl_port *port)
 		dport = devm_cxl_add_dport(port, &pdev->dev, pdev->id,
 					   CXL_RESOURCE_NONE);
 
-		if (IS_ERR(dport)) {
-			dev_err(dev, "failed to add dport: %s (%ld)\n",
-				dev_name(&pdev->dev), PTR_ERR(dport));
+		if (IS_ERR(dport))
 			return PTR_ERR(dport);
-		}
-
-		dev_dbg(dev, "add dport%d: %s\n", pdev->id,
-			dev_name(&pdev->dev));
 	}
 
 	return 0;