Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Received-SPF: Pass (protection.outlook.com: domain of amd.com designates
 165.204.84.17 as permitted sender) receiver=protection.outlook.com;
 client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C
From:   Robert Richter <rrichter@amd.com>
To:     Alison Schofield <alison.schofield@intel.com>,
        Vishal Verma <vishal.l.verma@intel.com>,
        Ira Weiny <ira.weiny@intel.com>,
        Ben Widawsky <bwidawsk@kernel.org>,
        Dan Williams <dan.j.williams@intel.com>
CC:     <linux-cxl@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Len Brown <lenb@kernel.org>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        "Davidlohr Bueso" <dave@stgolabs.net>,
        Dave Jiang <dave.jiang@intel.com>,
        Robert Richter <rrichter@amd.com>
Subject: [PATCH v3 7/9] cxl/pci: Factor out code in match_add_dports() to pci_dev_add_dport()
Date:   Wed, 9 Nov 2022 11:40:57 +0100
Message-ID: <20221109104059.766720-8-rrichter@amd.com>
In-Reply-To: <20221109104059.766720-1-rrichter@amd.com>
References: <20221109104059.766720-1-rrichter@amd.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Nov 2022 10:41:43.5770
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: e76397c1-a1ee-485a-0157-08dac23efe48
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com]
X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT031.eop-nam11.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5216
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,
        RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS autolearn=ham
        autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Factor out the code to register a PCI device's dport to a port. It
will be reused to implement RCD mode.

Signed-off-by: Robert Richter <rrichter@amd.com>
---
 drivers/cxl/core/pci.c | 37 ++++++++++++++++++++++++++-----------
 1 file changed, 26 insertions(+), 11 deletions(-)

diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index 8271b8abde7a..667de4f125f6 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -29,14 +29,32 @@ struct cxl_walk_context {
 	int count;
 };
 
+static int pci_dev_add_dport(struct pci_dev *pdev, struct cxl_port *port,
+			      resource_size_t component_reg_phys)
+{
+	struct cxl_dport *dport;
+	u32 lnkcap, port_num;
+
+	if (pci_read_config_dword(pdev, pci_pcie_cap(pdev) + PCI_EXP_LNKCAP,
+				  &lnkcap))
+		return -ENXIO;
+
+	port_num = FIELD_GET(PCI_EXP_LNKCAP_PN, lnkcap);
+	dport = devm_cxl_add_dport(port, &pdev->dev, port_num,
+				   component_reg_phys);
+	if (IS_ERR(dport))
+		return PTR_ERR(dport);
+
+	return 0;
+}
+
 static int match_add_dports(struct pci_dev *pdev, void *data)
 {
 	struct cxl_walk_context *ctx = data;
 	struct cxl_port *port = ctx->port;
 	int type = pci_pcie_type(pdev);
 	struct cxl_register_map map;
-	struct cxl_dport *dport;
-	u32 lnkcap, port_num;
+	resource_size_t component_reg_phys;
 	int rc;
 
 	if (pdev->bus != ctx->bus)
@@ -45,21 +63,18 @@ static int match_add_dports(struct pci_dev *pdev, void *data)
 		return 0;
 	if (type != ctx->type)
 		return 0;
-	if (pci_read_config_dword(pdev, pci_pcie_cap(pdev) + PCI_EXP_LNKCAP,
-				  &lnkcap))
-		return -ENXIO;
 
 	rc = cxl_find_regblock(pdev, CXL_REGLOC_RBI_COMPONENT, &map);
 	if (rc)
 		dev_dbg(&port->dev, "failed to find component registers\n");
 
-	port_num = FIELD_GET(PCI_EXP_LNKCAP_PN, lnkcap);
-	dport = devm_cxl_add_dport(port, &pdev->dev, port_num,
-				   cxl_regmap_to_base(pdev, &map));
-	if (IS_ERR(dport)) {
-		ctx->error = PTR_ERR(dport);
-		return PTR_ERR(dport);
+	component_reg_phys = cxl_regmap_to_base(pdev, &map);
+	rc = pci_dev_add_dport(pdev, port, component_reg_phys);
+	if (rc) {
+		ctx->error = rc;
+		return rc;
 	}
+
 	ctx->count++;
 
 	return 0;
-- 
2.30.2