netdev - [PATCH v4 06/26] cxl: add function for type2 cxl regs setup

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Message-ID: <20241017165225.21206-7-alejandro.lucero-palau@amd.com>
Date: Thu, 17 Oct 2024 17:52:05 +0100
From: <alejandro.lucero-palau@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <martin.habets@...inx.com>,
	<edward.cree@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <edumazet@...gle.com>
CC: Alejandro Lucero <alucerop@....com>
Subject: [PATCH v4 06/26] 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.

Signed-off-by: Alejandro Lucero <alucerop@....com>
---
 drivers/cxl/core/pci.c  | 47 +++++++++++++++++++++++++++++++++++++++++
 include/linux/cxl/cxl.h |  2 ++
 2 files changed, 49 insertions(+)

diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index 99acc258722d..f0f7e8bd4499 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -1141,6 +1141,53 @@ 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_setup_memdev_regs(struct pci_dev *pdev,
+				     struct cxl_dev_state *cxlds)
+{
+	struct cxl_register_map map;
+	int rc;
+
+	rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_MEMDEV, &map,
+				cxlds->capabilities);
+	/*
+	 * This call returning a non-zero value is not considered an error since
+	 * these regs are not mandatory for Type2. If they do exist then mapping
+	 * them should not fail.
+	 */
+	if (rc)
+		return 0;
+
+	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)
+{
+	int rc;
+
+	rc = cxl_pci_setup_memdev_regs(pdev, cxlds);
+	if (rc)
+		return rc;
+
+	rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_COMPONENT,
+				&cxlds->reg_map, cxlds->capabilities);
+	if (rc) {
+		dev_warn(&pdev->dev, "No component registers (%d)\n", rc);
+		return rc;
+	}
+
+	if (!test_bit(CXL_CM_CAP_CAP_ID_RAS, cxlds->capabilities))
+		return rc;
+
+	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);
+
 bool cxl_pci_check_caps(struct cxl_dev_state *cxlds, unsigned long *expected_caps,
 			unsigned long *current_caps)
 {
diff --git a/include/linux/cxl/cxl.h b/include/linux/cxl/cxl.h
index 78653fa4daa0..2f48ee591259 100644
--- a/include/linux/cxl/cxl.h
+++ b/include/linux/cxl/cxl.h
@@ -5,6 +5,7 @@
 #define __CXL_H
 
 #include <linux/device.h>
+#include <linux/pci.h>
 
 enum cxl_resource {
 	CXL_RES_DPA,
@@ -52,4 +53,5 @@ int cxl_set_resource(struct cxl_dev_state *cxlds, struct resource res,
 bool cxl_pci_check_caps(struct cxl_dev_state *cxlds,
 			unsigned long *expected_caps,
 			unsigned long *current_caps);
+int cxl_pci_accel_setup_regs(struct pci_dev *pdev, struct cxl_dev_state *cxlds);
 #endif
-- 
2.17.1