Merge tag 'block-5.15-2021-09-05' of git://git.kernel.dk/linux-block
[linux-2.6-microblaze.git] / tools / perf / util / mem2node.c
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
11 struct phys_entry {
12         struct rb_node  rb_node;
13         u64     start;
14         u64     end;
15         u64     node;
16 };
17
18 static 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
38 static void
39 phys_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
47 int 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 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
114 void mem2node__exit(struct mem2node *map)
115 {
116         zfree(&map->entries);
117 }
118
119 int 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;
137 out:
138         return entry ? (int) entry->node : -1;
139 }