linux-kernel - [PATCH v2 04/12] cxl: Unify debug messages when calling devm_cxl_add

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Date:   Tue, 18 Oct 2022 15:23:32 +0200
From:   Robert Richter <rrichter@....com>
To:     Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>
CC:     <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        "Davidlohr Bueso" <dave@...olabs.net>,
        Robert Richter <rrichter@....com>
Subject: [PATCH v2 04/12] 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@....com>
---
 drivers/cxl/acpi.c           |  7 ++----
 drivers/cxl/core/pci.c       |  2 --
 drivers/cxl/core/port.c      | 48 +++++++++++++++++++++++++-----------
 tools/testing/cxl/test/cxl.c |  8 +-----
 4 files changed, 37 insertions(+), 28 deletions(-)

diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
index 767a91f44221..31e104f0210f 100644
--- a/drivers/cxl/acpi.c
+++ b/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;
 }
 
diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index 9240df53ed87..0dbbe8d39b07 100644
--- a/drivers/cxl/core/pci.c
+++ b/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;
 }
 
diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index 9bfd01b4e5b5..0431ed860d8e 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -892,20 +892,10 @@ 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;
@@ -957,6 +947,36 @@ 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)
diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c
index a072b2d3e726..c610625e8261 100644
--- a/tools/testing/cxl/test/cxl.c
+++ b/tools/testing/cxl/test/cxl.c
@@ -582,14 +582,8 @@ 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;
-- 
2.30.2