1 files changed, 172 insertions, 0 deletions
diff --git a/include/linux/node.h b/include/linux/node.h
new file mode 100644
index 000000000..427a5975c
--- /dev/null
+++ b/include/linux/node.h
@@ -0,0 +1,172 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * include/linux/node.h - generic node definition
+ *
+ * This is mainly for topological representation. We define the
+ * basic 'struct node' here, which can be embedded in per-arch
+ * definitions of processors.
+ *
+ * Basic handling of the devices is done in drivers/base/node.c
+ * and system devices are handled in drivers/base/sys.c.
+ *
+ * Nodes are exported via driverfs in the class/node/devices/
+ * directory.
+ */
+#ifndef _LINUX_NODE_H_
+#define _LINUX_NODE_H_
+
+#include <linux/device.h>
+#include <linux/cpumask.h>
+#include <linux/list.h>
+
+/**
+ * struct node_hmem_attrs - heterogeneous memory performance attributes
+ *
+ * @read_bandwidth:	Read bandwidth in MB/s
+ * @write_bandwidth:	Write bandwidth in MB/s
+ * @read_latency:	Read latency in nanoseconds
+ * @write_latency:	Write latency in nanoseconds
+ */
+struct node_hmem_attrs {
+	unsigned int read_bandwidth;
+	unsigned int write_bandwidth;
+	unsigned int read_latency;
+	unsigned int write_latency;
+};
+
+enum cache_indexing {
+	NODE_CACHE_DIRECT_MAP,
+	NODE_CACHE_INDEXED,
+	NODE_CACHE_OTHER,
+};
+
+enum cache_write_policy {
+	NODE_CACHE_WRITE_BACK,
+	NODE_CACHE_WRITE_THROUGH,
+	NODE_CACHE_WRITE_OTHER,
+};
+
+/**
+ * struct node_cache_attrs - system memory caching attributes
+ *
+ * @indexing:		The ways memory blocks may be placed in cache
+ * @write_policy:	Write back or write through policy
+ * @size:		Total size of cache in bytes
+ * @line_size:		Number of bytes fetched on a cache miss
+ * @level:		The cache hierarchy level
+ */
+struct node_cache_attrs {
+	enum cache_indexing indexing;
+	enum cache_write_policy write_policy;
+	u64 size;
+	u16 line_size;
+	u8 level;
+};
+
+#ifdef CONFIG_HMEM_REPORTING
+void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs);
+void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs,
+			 unsigned access);
+#else
+static inline void node_add_cache(unsigned int nid,
+				  struct node_cache_attrs *cache_attrs)
+{
+}
+
+static inline void node_set_perf_attrs(unsigned int nid,
+				       struct node_hmem_attrs *hmem_attrs,
+				       unsigned access)
+{
+}
+#endif
+
+struct node {
+	struct device	dev;
+	struct list_head access_list;
+#ifdef CONFIG_HMEM_REPORTING
+	struct list_head cache_attrs;
+	struct device *cache_dev;
+#endif
+};
+
+struct memory_block;
+extern struct node *node_devices[];
+
+#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_NUMA)
+void register_memory_blocks_under_node(int nid, unsigned long start_pfn,
+				       unsigned long end_pfn,
+				       enum meminit_context context);
+#else
+static inline void register_memory_blocks_under_node(int nid, unsigned long start_pfn,
+						     unsigned long end_pfn,
+						     enum meminit_context context)
+{
+}
+#endif
+
+extern void unregister_node(struct node *node);
+#ifdef CONFIG_NUMA
+extern void node_dev_init(void);
+/* Core of the node registration - only memory hotplug should use this */
+extern int __register_one_node(int nid);
+
+/* Registers an online node */
+static inline int register_one_node(int nid)
+{
+	int error = 0;
+
+	if (node_online(nid)) {
+		struct pglist_data *pgdat = NODE_DATA(nid);
+		unsigned long start_pfn = pgdat->node_start_pfn;
+		unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
+
+		error = __register_one_node(nid);
+		if (error)
+			return error;
+		register_memory_blocks_under_node(nid, start_pfn, end_pfn,
+						  MEMINIT_EARLY);
+	}
+
+	return error;
+}
+
+extern void unregister_one_node(int nid);
+extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
+extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
+extern void unregister_memory_block_under_nodes(struct memory_block *mem_blk);
+
+extern int register_memory_node_under_compute_node(unsigned int mem_nid,
+						   unsigned int cpu_nid,
+						   unsigned access);
+#else
+static inline void node_dev_init(void)
+{
+}
+static inline int __register_one_node(int nid)
+{
+	return 0;
+}
+static inline int register_one_node(int nid)
+{
+	return 0;
+}
+static inline int unregister_one_node(int nid)
+{
+	return 0;
+}
+static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
+{
+	return 0;
+}
+static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
+{
+	return 0;
+}
+static inline void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
+{
+}
+#endif
+
+#define to_node(device) container_of(device, struct node, dev)
+
+#endif /* _LINUX_NODE_H_ */