netdev - [PATCH v14 05/22] cxl: add function for type2 cxl regs setup

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Message-ID: <20250417212926.1343268-6-alejandro.lucero-palau@amd.com>
Date: Thu, 17 Apr 2025 22:29:08 +0100
From: <alejandro.lucero-palau@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <edward.cree@....com>, <davem@...emloft.net>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <edumazet@...gle.com>,
	<dave.jiang@...el.com>
CC: Alejandro Lucero <alucerop@....com>, Ben Cheatham
	<benjamin.cheatham@....com>
Subject: [PATCH v14 05/22] cxl: add function for type2 cxl regs setup

From: Alejandro Lucero <alucerop@....com>

Create a new function for a type2 device initialising
cxl_dev_state struct regarding cxl regs setup and mapping.

Export the capabilities found for checking them against the
expected ones by the driver.

Signed-off-by: Alejandro Lucero <alucerop@....com>
Reviewed-by: Ben Cheatham <benjamin.cheatham@....com>
---
 drivers/cxl/core/pci.c | 52 ++++++++++++++++++++++++++++++++++++++++++
 include/cxl/cxl.h      |  3 +++
 2 files changed, 55 insertions(+)

diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index ed18260ff1c9..309d1e2a6798 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -1095,6 +1095,58 @@ int cxl_pci_setup_regs(struct pci_dev *pdev, enum cxl_regloc_type type,
 }
 EXPORT_SYMBOL_NS_GPL(cxl_pci_setup_regs, "CXL");
 
+static int cxl_pci_accel_setup_memdev_regs(struct pci_dev *pdev,
+					   struct cxl_dev_state *cxlds,
+					   unsigned long *caps)
+{
+	struct cxl_register_map map;
+	int rc;
+
+	rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_MEMDEV, &map, caps);
+	/*
+	 * This call can return -ENODEV if regs not found. This is not an error
+	 * for Type2 since these regs are not mandatory. If they do exist then
+	 * mapping them should not fail. If they should exist, it is with driver
+	 * calling cxl_pci_check_caps() where the problem should be found.
+	 */
+	if (rc == -ENODEV)
+		return 0;
+
+	if (rc)
+		return rc;
+
+	return cxl_map_device_regs(&map, &cxlds->regs.device_regs);
+}
+
+int cxl_pci_accel_setup_regs(struct pci_dev *pdev, struct cxl_dev_state *cxlds,
+			     unsigned long *caps)
+{
+	int rc;
+
+	rc = cxl_pci_accel_setup_memdev_regs(pdev, cxlds, caps);
+	if (rc)
+		return rc;
+
+	rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_COMPONENT,
+				&cxlds->reg_map, caps);
+	if (rc) {
+		dev_warn(&pdev->dev, "No component registers (%d)\n", rc);
+		return rc;
+	}
+
+	if (!caps || !test_bit(CXL_CM_CAP_CAP_ID_RAS, caps))
+		return 0;
+
+	rc = cxl_map_component_regs(&cxlds->reg_map,
+				    &cxlds->regs.component,
+				    BIT(CXL_CM_CAP_CAP_ID_RAS));
+	if (rc)
+		dev_dbg(&pdev->dev, "Failed to map RAS capability.\n");
+
+	return rc;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_pci_accel_setup_regs, "CXL");
+
 int cxl_pci_get_bandwidth(struct pci_dev *pdev, struct access_coordinate *c)
 {
 	int speed, bw;
diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h
index afad8a86c2bc..2d8b58460311 100644
--- a/include/cxl/cxl.h
+++ b/include/cxl/cxl.h
@@ -231,4 +231,7 @@ struct cxl_dev_state *_cxl_dev_state_create(struct device *dev,
 struct pci_dev;
 int cxl_check_caps(struct pci_dev *pdev, unsigned long *expected,
 		   unsigned long *found);
+
+int cxl_pci_accel_setup_regs(struct pci_dev *pdev, struct cxl_dev_state *cxlmds,
+			     unsigned long *caps);
 #endif /* __CXL_CXL_H__ */
-- 
2.34.1