1 files changed, 60 insertions, 0 deletions
diff --git a/arch/x86/include/asm/amd_node.h b/arch/x86/include/asm/amd_node.h
new file mode 100644
index 000000000000..23fe617898a8
--- /dev/null
+++ b/arch/x86/include/asm/amd_node.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * AMD Node helper functions and common defines
+ *
+ * Copyright (c) 2024, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Yazen Ghannam <Yazen.Ghannam@amd.com>
+ *
+ * Note:
+ * Items in this file may only be used in a single place.
+ * However, it's prudent to keep all AMD Node functionality
+ * in a unified place rather than spreading throughout the
+ * kernel.
+ */
+
+#ifndef _ASM_X86_AMD_NODE_H_
+#define _ASM_X86_AMD_NODE_H_
+
+#include <linux/pci.h>
+
+#define MAX_AMD_NUM_NODES	8
+#define AMD_NODE0_PCI_SLOT	0x18
+
+struct pci_dev *amd_node_get_func(u16 node, u8 func);
+struct pci_dev *amd_node_get_root(u16 node);
+
+static inline u16 amd_num_nodes(void)
+{
+	return topology_amd_nodes_per_pkg() * topology_max_packages();
+}
+
+#ifdef CONFIG_AMD_NODE
+int __must_check amd_smn_read(u16 node, u32 address, u32 *value);
+int __must_check amd_smn_write(u16 node, u32 address, u32 value);
+
+/* Should only be used by the HSMP driver. */
+int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write);
+#else
+static inline int __must_check amd_smn_read(u16 node, u32 address, u32 *value) { return -ENODEV; }
+static inline int __must_check amd_smn_write(u16 node, u32 address, u32 value) { return -ENODEV; }
+
+static inline int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write)
+{
+	return -ENODEV;
+}
+#endif /* CONFIG_AMD_NODE */
+
+/* helper for use with read_poll_timeout */
+static inline int smn_read_register(u32 reg)
+{
+	int data, rc;
+
+	rc = amd_smn_read(0, reg, &data);
+	if (rc)
+		return rc;
+
+	return data;
+}
+#endif /*_ASM_X86_AMD_NODE_H_*/