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Diffstat (limited to 'include/linux/node.h')
-rw-r--r-- | include/linux/node.h | 172 |
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_ */ |