cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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memory.h (6411B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * include/linux/memory.h - generic memory definition
      4 *
      5 * This is mainly for topological representation. We define the
      6 * basic "struct memory_block" here, which can be embedded in per-arch
      7 * definitions or NUMA information.
      8 *
      9 * Basic handling of the devices is done in drivers/base/memory.c
     10 * and system devices are handled in drivers/base/sys.c.
     11 *
     12 * Memory block are exported via sysfs in the class/memory/devices/
     13 * directory.
     14 *
     15 */
     16#ifndef _LINUX_MEMORY_H_
     17#define _LINUX_MEMORY_H_
     18
     19#include <linux/node.h>
     20#include <linux/compiler.h>
     21#include <linux/mutex.h>
     22#include <linux/notifier.h>
     23
     24#define MIN_MEMORY_BLOCK_SIZE     (1UL << SECTION_SIZE_BITS)
     25
     26/**
     27 * struct memory_group - a logical group of memory blocks
     28 * @nid: The node id for all memory blocks inside the memory group.
     29 * @blocks: List of all memory blocks belonging to this memory group.
     30 * @present_kernel_pages: Present (online) memory outside ZONE_MOVABLE of this
     31 *			  memory group.
     32 * @present_movable_pages: Present (online) memory in ZONE_MOVABLE of this
     33 *			   memory group.
     34 * @is_dynamic: The memory group type: static vs. dynamic
     35 * @s.max_pages: Valid with &memory_group.is_dynamic == false. The maximum
     36 *		 number of pages we'll have in this static memory group.
     37 * @d.unit_pages: Valid with &memory_group.is_dynamic == true. Unit in pages
     38 *		  in which memory is added/removed in this dynamic memory group.
     39 *		  This granularity defines the alignment of a unit in physical
     40 *		  address space; it has to be at least as big as a single
     41 *		  memory block.
     42 *
     43 * A memory group logically groups memory blocks; each memory block
     44 * belongs to at most one memory group. A memory group corresponds to
     45 * a memory device, such as a DIMM or a NUMA node, which spans multiple
     46 * memory blocks and might even span multiple non-contiguous physical memory
     47 * ranges.
     48 *
     49 * Modification of members after registration is serialized by memory
     50 * hot(un)plug code.
     51 */
     52struct memory_group {
     53	int nid;
     54	struct list_head memory_blocks;
     55	unsigned long present_kernel_pages;
     56	unsigned long present_movable_pages;
     57	bool is_dynamic;
     58	union {
     59		struct {
     60			unsigned long max_pages;
     61		} s;
     62		struct {
     63			unsigned long unit_pages;
     64		} d;
     65	};
     66};
     67
     68struct memory_block {
     69	unsigned long start_section_nr;
     70	unsigned long state;		/* serialized by the dev->lock */
     71	int online_type;		/* for passing data to online routine */
     72	int nid;			/* NID for this memory block */
     73	/*
     74	 * The single zone of this memory block if all PFNs of this memory block
     75	 * that are System RAM (not a memory hole, not ZONE_DEVICE ranges) are
     76	 * managed by a single zone. NULL if multiple zones (including nodes)
     77	 * apply.
     78	 */
     79	struct zone *zone;
     80	struct device dev;
     81	/*
     82	 * Number of vmemmap pages. These pages
     83	 * lay at the beginning of the memory block.
     84	 */
     85	unsigned long nr_vmemmap_pages;
     86	struct memory_group *group;	/* group (if any) for this block */
     87	struct list_head group_next;	/* next block inside memory group */
     88};
     89
     90int arch_get_memory_phys_device(unsigned long start_pfn);
     91unsigned long memory_block_size_bytes(void);
     92int set_memory_block_size_order(unsigned int order);
     93
     94/* These states are exposed to userspace as text strings in sysfs */
     95#define	MEM_ONLINE		(1<<0) /* exposed to userspace */
     96#define	MEM_GOING_OFFLINE	(1<<1) /* exposed to userspace */
     97#define	MEM_OFFLINE		(1<<2) /* exposed to userspace */
     98#define	MEM_GOING_ONLINE	(1<<3)
     99#define	MEM_CANCEL_ONLINE	(1<<4)
    100#define	MEM_CANCEL_OFFLINE	(1<<5)
    101
    102struct memory_notify {
    103	unsigned long start_pfn;
    104	unsigned long nr_pages;
    105	int status_change_nid_normal;
    106	int status_change_nid;
    107};
    108
    109struct notifier_block;
    110struct mem_section;
    111
    112/*
    113 * Priorities for the hotplug memory callback routines (stored in decreasing
    114 * order in the callback chain)
    115 */
    116#define SLAB_CALLBACK_PRI       1
    117#define IPC_CALLBACK_PRI        10
    118
    119#ifndef CONFIG_MEMORY_HOTPLUG
    120static inline void memory_dev_init(void)
    121{
    122	return;
    123}
    124static inline int register_memory_notifier(struct notifier_block *nb)
    125{
    126	return 0;
    127}
    128static inline void unregister_memory_notifier(struct notifier_block *nb)
    129{
    130}
    131static inline int memory_notify(unsigned long val, void *v)
    132{
    133	return 0;
    134}
    135static inline int hotplug_memory_notifier(notifier_fn_t fn, int pri)
    136{
    137	return 0;
    138}
    139/* These aren't inline functions due to a GCC bug. */
    140#define register_hotmemory_notifier(nb)    ({ (void)(nb); 0; })
    141#define unregister_hotmemory_notifier(nb)  ({ (void)(nb); })
    142#else /* CONFIG_MEMORY_HOTPLUG */
    143extern int register_memory_notifier(struct notifier_block *nb);
    144extern void unregister_memory_notifier(struct notifier_block *nb);
    145int create_memory_block_devices(unsigned long start, unsigned long size,
    146				unsigned long vmemmap_pages,
    147				struct memory_group *group);
    148void remove_memory_block_devices(unsigned long start, unsigned long size);
    149extern void memory_dev_init(void);
    150extern int memory_notify(unsigned long val, void *v);
    151extern struct memory_block *find_memory_block(unsigned long section_nr);
    152typedef int (*walk_memory_blocks_func_t)(struct memory_block *, void *);
    153extern int walk_memory_blocks(unsigned long start, unsigned long size,
    154			      void *arg, walk_memory_blocks_func_t func);
    155extern int for_each_memory_block(void *arg, walk_memory_blocks_func_t func);
    156
    157extern int memory_group_register_static(int nid, unsigned long max_pages);
    158extern int memory_group_register_dynamic(int nid, unsigned long unit_pages);
    159extern int memory_group_unregister(int mgid);
    160struct memory_group *memory_group_find_by_id(int mgid);
    161typedef int (*walk_memory_groups_func_t)(struct memory_group *, void *);
    162int walk_dynamic_memory_groups(int nid, walk_memory_groups_func_t func,
    163			       struct memory_group *excluded, void *arg);
    164#define hotplug_memory_notifier(fn, pri) ({		\
    165	static __meminitdata struct notifier_block fn##_mem_nb =\
    166		{ .notifier_call = fn, .priority = pri };\
    167	register_memory_notifier(&fn##_mem_nb);			\
    168})
    169#define register_hotmemory_notifier(nb)		register_memory_notifier(nb)
    170#define unregister_hotmemory_notifier(nb) 	unregister_memory_notifier(nb)
    171
    172#ifdef CONFIG_NUMA
    173void memory_block_add_nid(struct memory_block *mem, int nid,
    174			  enum meminit_context context);
    175#endif /* CONFIG_NUMA */
    176#endif	/* CONFIG_MEMORY_HOTPLUG */
    177
    178/*
    179 * Kernel text modification mutex, used for code patching. Users of this lock
    180 * can sleep.
    181 */
    182extern struct mutex text_mutex;
    183
    184#endif /* _LINUX_MEMORY_H_ */