projects/linux·blob master · refs

139 lines · 2.8 KiB

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 else
31 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 void
39phys_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 = calloc(max, sizeof(*entries));
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 order
81 * 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 else
133 goto out;
134 }
135
136 entry = NULL;
137out:
138 return entry ? (int) entry->node : -1;
139}