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1#include <errno.h>2#include <inttypes.h>3#include <asm/bug.h>4#include <linux/bitmap.h>5#include <linux/kernel.h>6#include <linux/zalloc.h>7#include "debug.h"8#include "env.h"9#include "mem2node.h"10 11struct phys_entry {12	struct rb_node	rb_node;13	u64	start;14	u64	end;15	u64	node;16};17 18static void phys_entry__insert(struct phys_entry *entry, struct rb_root *root)19{20	struct rb_node **p = &root->rb_node;21	struct rb_node *parent = NULL;22	struct phys_entry *e;23 24	while (*p != NULL) {25		parent = *p;26		e = rb_entry(parent, struct phys_entry, rb_node);27 28		if (entry->start < e->start)29			p = &(*p)->rb_left;30		else31			p = &(*p)->rb_right;32	}33 34	rb_link_node(&entry->rb_node, parent, p);35	rb_insert_color(&entry->rb_node, root);36}37 38static void39phys_entry__init(struct phys_entry *entry, u64 start, u64 bsize, u64 node)40{41	entry->start = start;42	entry->end   = start + bsize;43	entry->node  = node;44	RB_CLEAR_NODE(&entry->rb_node);45}46 47int mem2node__init(struct mem2node *map, struct perf_env *env)48{49	struct memory_node *n, *nodes = &env->memory_nodes[0];50	struct phys_entry *entries, *tmp_entries;51	u64 bsize = env->memory_bsize;52	int i, j = 0, max = 0;53 54	memset(map, 0x0, sizeof(*map));55	map->root = RB_ROOT;56 57	for (i = 0; i < env->nr_memory_nodes; i++) {58		n = &nodes[i];59		max += bitmap_weight(n->set, n->size);60	}61 62	entries = zalloc(sizeof(*entries) * max);63	if (!entries)64		return -ENOMEM;65 66	for (i = 0; i < env->nr_memory_nodes; i++) {67		u64 bit;68 69		n = &nodes[i];70 71		for (bit = 0; bit < n->size; bit++) {72			u64 start;73 74			if (!test_bit(bit, n->set))75				continue;76 77			start = bit * bsize;78 79			/*80			 * Merge nearby areas, we walk in order81			 * through the bitmap, so no need to sort.82			 */83			if (j > 0) {84				struct phys_entry *prev = &entries[j - 1];85 86				if ((prev->end == start) &&87				    (prev->node == n->node)) {88					prev->end += bsize;89					continue;90				}91			}92 93			phys_entry__init(&entries[j++], start, bsize, n->node);94		}95	}96 97	/* Cut unused entries, due to merging. */98	tmp_entries = realloc(entries, sizeof(*entries) * j);99	if (tmp_entries ||100	    WARN_ONCE(j == 0, "No memory nodes, is CONFIG_MEMORY_HOTPLUG enabled?\n"))101		entries = tmp_entries;102 103	for (i = 0; i < j; i++) {104		pr_debug("mem2node %03" PRIu64 " [0x%016" PRIx64 "-0x%016" PRIx64 "]\n",105			 entries[i].node, entries[i].start, entries[i].end);106 107		phys_entry__insert(&entries[i], &map->root);108	}109 110	map->entries = entries;111	return 0;112}113 114void mem2node__exit(struct mem2node *map)115{116	zfree(&map->entries);117}118 119int mem2node__node(struct mem2node *map, u64 addr)120{121	struct rb_node **p, *parent = NULL;122	struct phys_entry *entry;123 124	p = &map->root.rb_node;125	while (*p != NULL) {126		parent = *p;127		entry = rb_entry(parent, struct phys_entry, rb_node);128		if (addr < entry->start)129			p = &(*p)->rb_left;130		else if (addr >= entry->end)131			p = &(*p)->rb_right;132		else133			goto out;134	}135 136	entry = NULL;137out:138	return entry ? (int) entry->node : -1;139}140