linux-kernel - [PATCH v11 10/20] cxl/pci: Introduce config option PCIEAER

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Date:   Wed, 27 Sep 2023 17:43:29 +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>,
        "Davidlohr Bueso" <dave@...olabs.net>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Dave Jiang <dave.jiang@...el.com>
CC:     <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Terry Bowman <terry.bowman@....com>,
        Robert Richter <rrichter@....com>
Subject: [PATCH v11 10/20] cxl/pci: Introduce config option PCIEAER_CXL

CXL error handling depends on AER.

Introduce config option PCIEAER_CXL in preparation of the AER dport
error handling. Also, introduce the stub function
devm_cxl_setup_parent_dport() to setup dports.

This is in preparation of follow on patches.

Note the Kconfg part of the option is added in a later patch to enable
it once coding of the feature is complete.

Signed-off-by: Robert Richter <rrichter@....com>
---
 drivers/cxl/core/pci.c | 9 +++++++++
 drivers/cxl/cxl.h      | 7 +++++++
 drivers/cxl/mem.c      | 2 ++
 3 files changed, 18 insertions(+)

diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index c7a7887ebdcf..6ba3b7370816 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -718,6 +718,15 @@ static bool cxl_report_and_clear(struct cxl_dev_state *cxlds)
 	return true;
 }
 
+#ifdef CONFIG_PCIEAER_CXL
+
+void devm_cxl_setup_parent_dport(struct device *host, struct cxl_dport *dport)
+{
+}
+EXPORT_SYMBOL_NS_GPL(devm_cxl_setup_parent_dport, CXL);
+
+#endif
+
 pci_ers_result_t cxl_error_detected(struct pci_dev *pdev,
 				    pci_channel_state_t state)
 {
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index c07064e0c136..cfa2f6bede41 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -704,6 +704,13 @@ struct cxl_dport *devm_cxl_add_rch_dport(struct cxl_port *port,
 					 struct device *dport_dev, int port_id,
 					 resource_size_t rcrb);
 
+#ifdef CONFIG_PCIEAER_CXL
+void devm_cxl_setup_parent_dport(struct device *host, struct cxl_dport *dport);
+#else
+static inline void devm_cxl_setup_parent_dport(struct device *host,
+					       struct cxl_dport *dport) { }
+#endif
+
 struct cxl_decoder *to_cxl_decoder(struct device *dev);
 struct cxl_root_decoder *to_cxl_root_decoder(struct device *dev);
 struct cxl_switch_decoder *to_cxl_switch_decoder(struct device *dev);
diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c
index 04107058739b..61ca21c020fa 100644
--- a/drivers/cxl/mem.c
+++ b/drivers/cxl/mem.c
@@ -157,6 +157,8 @@ static int cxl_mem_probe(struct device *dev)
 	else
 		endpoint_parent = &parent_port->dev;
 
+	devm_cxl_setup_parent_dport(dev, dport);
+
 	device_lock(endpoint_parent);
 	if (!endpoint_parent->driver) {
 		dev_err(dev, "CXL port topology %s not enabled\n",
-- 
2.30.2