aboutsummaryrefslogtreecommitdiffstats
path: root/src/vppinfra/pmalloc.c
blob: a8b47d74c9b78c4c3aa93113c8e524a229eae749 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
/*
 * Copyright (c) 2018 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define _GNU_SOURCE
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/mempolicy.h>
#include <linux/memfd.h>

#include <vppinfra/format.h>
#include <vppinfra/linux/syscall.h>
#include <vppinfra/linux/sysfs.h>
#include <vppinfra/mem.h>
#include <vppinfra/hash.h>
#include <vppinfra/pmalloc.h>

#if __SIZEOF_POINTER__ >= 8
#define DEFAULT_RESERVED_MB 16384
#else
#define DEFAULT_RESERVED_MB 256
#endif

static inline clib_pmalloc_chunk_t *
get_chunk (clib_pmalloc_page_t * pp, u32 index)
{
  return pool_elt_at_index (pp->chunks, index);
}

static inline int
pmalloc_validate_numa_node (u32 * numa_node)
{
  if (*numa_node == CLIB_PMALLOC_NUMA_LOCAL)
    {
      u32 cpu;
      if (getcpu (&cpu, numa_node, 0) != 0)
	return 1;
    }
  return 0;
}

int
clib_pmalloc_init (clib_pmalloc_main_t * pm, uword size)
{
  uword off, pagesize;

  ASSERT (pm->error == 0);

  pagesize = clib_mem_get_default_hugepage_size ();
  pm->log2_page_sz = min_log2 (pagesize);

  size = size ? size : ((u64) DEFAULT_RESERVED_MB) << 20;
  size = round_pow2 (size, pagesize);

  pm->max_pages = size >> pm->log2_page_sz;

  /* reserve VA space for future growth */
  pm->base = mmap (0, size + pagesize, PROT_NONE,
		   MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  if (pm->base == MAP_FAILED)
    {
      pm->error = clib_error_return_unix (0, "failed to reserve %u pages");
      return -1;
    }

  off = round_pow2 (pointer_to_uword (pm->base), pagesize) -
    pointer_to_uword (pm->base);

  /* trim start and end of reservation to be page aligned */
  if (off)
    {
      munmap (pm->base, off);
      pm->base += off;
    }

  munmap (pm->base + (pm->max_pages * pagesize), pagesize - off);
  return 0;
}

static inline void *
alloc_chunk_from_page (clib_pmalloc_main_t * pm, clib_pmalloc_page_t * pp,
		       u32 n_blocks, u32 block_align, u32 numa_node)
{
  clib_pmalloc_chunk_t *c;
  void *va;
  u32 off;
  u32 alloc_chunk_index;

  if (pp->chunks == 0)
    {
      pool_get (pp->chunks, c);
      pp->n_free_chunks = 1;
      pp->first_chunk_index = c - pp->chunks;
      c->prev = c->next = ~0;
      c->size = pp->n_free_blocks;
    }

  alloc_chunk_index = pp->first_chunk_index;

next_chunk:
  c = pool_elt_at_index (pp->chunks, alloc_chunk_index);
  off = (block_align - (c->start & (block_align - 1))) & (block_align - 1);

  if (c->used || n_blocks + off > c->size)
    {
      if (c->next == ~0)
	return 0;
      alloc_chunk_index = c->next;
      goto next_chunk;
    }

  /* if alignment is needed create new empty chunk */
  if (off)
    {
      u32 offset_chunk_index;
      clib_pmalloc_chunk_t *co;
      pool_get (pp->chunks, c);
      pp->n_free_chunks++;
      offset_chunk_index = alloc_chunk_index;
      alloc_chunk_index = c - pp->chunks;

      co = pool_elt_at_index (pp->chunks, offset_chunk_index);
      c->size = co->size - off;
      c->next = co->next;
      c->start = co->start + off;
      c->prev = offset_chunk_index;
      co->size = off;
      co->next = alloc_chunk_index;
    }

  c->used = 1;
  if (c->size > n_blocks)
    {
      u32 tail_chunk_index;
      clib_pmalloc_chunk_t *ct;
      pool_get (pp->chunks, ct);
      pp->n_free_chunks++;
      tail_chunk_index = ct - pp->chunks;
      c = pool_elt_at_index (pp->chunks, alloc_chunk_index);
      ct->size = c->size - n_blocks;
      ct->next = c->next;
      ct->prev = alloc_chunk_index;
      ct->start = c->start + n_blocks;

      c->size = n_blocks;
      c->next = tail_chunk_index;
      if (ct->next != ~0)
	pool_elt_at_index (pp->chunks, ct->next)->prev = tail_chunk_index;
    }
  else if (c->next != ~0)
    pool_elt_at_index (pp->chunks, c->next)->prev = alloc_chunk_index;

  c = get_chunk (pp, alloc_chunk_index);
  va = pm->base + ((pp - pm->pages) << pm->log2_page_sz) +
    (c->start << PMALLOC_LOG2_BLOCK_SZ);
  hash_set (pm->chunk_index_by_va, pointer_to_uword (va), alloc_chunk_index);
  pp->n_free_blocks -= n_blocks;
  pp->n_free_chunks--;
  return va;
}

static inline clib_pmalloc_page_t *
pmalloc_map_pages (clib_pmalloc_main_t * pm, clib_pmalloc_arena_t * a,
		   u32 numa_node, u32 n_pages)
{
  clib_pmalloc_page_t *pp = 0;
  u64 seek, pa, sys_page_size;
  int pagemap_fd, status, rv, i, mmap_flags;
  void *va;
  int old_mpol = -1;
  long unsigned int mask[16] = { 0 };
  long unsigned int old_mask[16] = { 0 };

  clib_error_free (pm->error);

  if (pm->max_pages <= vec_len (pm->pages))
    {
      pm->error = clib_error_return (0, "maximum number of pages reached");
      return 0;
    }

  pm->error = clib_sysfs_prealloc_hugepages (numa_node, pm->log2_page_sz,
					     n_pages);

  if (pm->error)
    return 0;

  rv = get_mempolicy (&old_mpol, old_mask, sizeof (old_mask) * 8 + 1, 0, 0);
  /* failure to get mempolicy means we can only proceed with numa 0 maps */
  if (rv == -1 && numa_node != 0)
    {
      pm->error = clib_error_return_unix (0, "failed to get mempolicy");
      return 0;
    }

  mask[0] = 1 << numa_node;
  rv = set_mempolicy (MPOL_BIND, mask, sizeof (mask) * 8 + 1);
  if (rv == -1 && numa_node != 0)
    {
      pm->error = clib_error_return_unix (0, "failed to set mempolicy for "
					  "numa node %u", numa_node);
      return 0;
    }

  mmap_flags = MAP_FIXED | MAP_HUGETLB | MAP_LOCKED | MAP_ANONYMOUS;
  if (a->flags & CLIB_PMALLOC_ARENA_F_SHARED_MEM)
    {
      mmap_flags |= MAP_SHARED;
      pm->error = clib_mem_create_hugetlb_fd ((char *) a->name, &a->fd);
      if (a->fd == -1)
	goto error;
    }
  else
    {
      mmap_flags |= MAP_PRIVATE;
      a->fd = -1;
    }

  va = pm->base + (vec_len (pm->pages) << pm->log2_page_sz);
  if (mmap (va, n_pages << pm->log2_page_sz, PROT_READ | PROT_WRITE,
	    mmap_flags, a->fd, 0) == MAP_FAILED)
    {
      pm->error = clib_error_return_unix (0, "failed to mmap %u pages at %p "
					  "fd %d numa %d flags 0x%x", n_pages,
					  va, a->fd, numa_node, mmap_flags);
      goto error;
    }

  rv = set_mempolicy (old_mpol, old_mask, sizeof (old_mask) * 8 + 1);
  if (rv == -1 && numa_node != 0)
    {
      pm->error = clib_error_return_unix (0, "failed to restore mempolicy");
      goto error;
    }

  /* we tolerate move_pages failure only if request os for numa node 0
     to support non-numa kernels */
  rv = move_pages (0, 1, &va, 0, &status, 0);
  if ((rv == 0 && status != numa_node) || (rv != 0 && numa_node != 0))
    {
      pm->error = rv == -1 ?
	clib_error_return_unix (0, "page allocated on wrong node, numa node "
				"%u status %d", numa_node, status) :
	clib_error_return (0, "page allocated on wrong node, numa node "
			   "%u status %d", numa_node, status);

      /* unmap & reesrve */
      munmap (va, n_pages << pm->log2_page_sz);
      mmap (va, n_pages << pm->log2_page_sz, PROT_NONE,
	    MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
      goto error;
    }

  clib_memset (va, 0, n_pages << pm->log2_page_sz);
  sys_page_size = sysconf (_SC_PAGESIZE);
  pagemap_fd = open ((char *) "/proc/self/pagemap", O_RDONLY);

  for (i = 0; i < n_pages; i++)
    {
      uword page_va = pointer_to_uword ((u8 *) va + (i << pm->log2_page_sz));
      vec_add2 (pm->pages, pp, 1);
      pp->n_free_blocks = 1 << (pm->log2_page_sz - PMALLOC_LOG2_BLOCK_SZ);
      pp->index = pp - pm->pages;
      pp->arena_index = a->index;

      vec_add1 (a->page_indices, pp->index);
      a->n_pages++;

      seek = (page_va / sys_page_size) * sizeof (pa);
      if (pagemap_fd != -1 &&
	  lseek (pagemap_fd, seek, SEEK_SET) == seek &&
	  read (pagemap_fd, &pa, sizeof (pa)) == (sizeof (pa)) &&
	  pa & (1ULL << 63) /* page present bit */ )
	{
	  pp->pa = (pa & pow2_mask (55)) * sys_page_size;
	}
      vec_add1_aligned (pm->va_pa_diffs, pp->pa ? page_va - pp->pa : 0,
			CLIB_CACHE_LINE_BYTES);
    }

  if (pagemap_fd != -1)
    close (pagemap_fd);

  /* return pointer to 1st page */
  return pp - (n_pages - 1);

error:
  if (a->fd != -1)
    close (a->fd);
  return 0;
}

void *
clib_pmalloc_create_shared_arena (clib_pmalloc_main_t * pm, char *name,
				  uword size, u32 numa_node)
{
  clib_pmalloc_arena_t *a;
  clib_pmalloc_page_t *pp;
  u32 n_pages = round_pow2 (size, 1ULL << pm->log2_page_sz) >>
    pm->log2_page_sz;

  if (n_pages + vec_len (pm->pages) > pm->max_pages)
    return 0;

  if (pmalloc_validate_numa_node (&numa_node))
    return 0;

  pool_get (pm->arenas, a);
  a->index = a - pm->arenas;
  a->name = format (0, "%s%c", name, 0);
  a->numa_node = numa_node;
  a->flags = CLIB_PMALLOC_ARENA_F_SHARED_MEM;
  a->log2_page_sz = pm->log2_page_sz;

  if ((pp = pmalloc_map_pages (pm, a, numa_node, n_pages)) == 0)
    {
      vec_free (a->name);
      memset (a, 0, sizeof (*a));
      pool_put (pm->arenas, a);
      return 0;
    }

  return pm->base + (pp->index << pm->log2_page_sz);
}

static inline void *
clib_pmalloc_alloc_inline (clib_pmalloc_main_t * pm, clib_pmalloc_arena_t * a,
			   uword size, uword align, u32 numa_node)
{
  clib_pmalloc_page_t *pp;
  u32 n_blocks, block_align, *page_index;

  ASSERT (is_pow2 (align));

  if (pmalloc_validate_numa_node (&numa_node))
    return 0;

  if (a == 0)
    {
      vec_validate_init_empty (pm->default_arena_for_numa_node,
			       numa_node, ~0);
      if (pm->default_arena_for_numa_node[numa_node] == ~0)
	{
	  pool_get (pm->arenas, a);
	  pm->default_arena_for_numa_node[numa_node] = a - pm->arenas;
	  a->name = format (0, "default-numa-%u%c", numa_node, 0);
	  a->numa_node = numa_node;
	}
      else
	a = pool_elt_at_index (pm->arenas,
			       pm->default_arena_for_numa_node[numa_node]);
    }

  n_blocks = round_pow2 (size, PMALLOC_BLOCK_SZ) / PMALLOC_BLOCK_SZ;
  block_align = align >> PMALLOC_LOG2_BLOCK_SZ;

  vec_foreach (page_index, a->page_indices)
  {
    pp = vec_elt_at_index (pm->pages, *page_index);
    void *rv = alloc_chunk_from_page (pm, pp, n_blocks, block_align,
				      numa_node);

    if (rv)
      return rv;
  }

  if ((a->flags & CLIB_PMALLOC_ARENA_F_SHARED_MEM) == 0 &&
      (pp = pmalloc_map_pages (pm, a, numa_node, 1)))
    return alloc_chunk_from_page (pm, pp, n_blocks, block_align, numa_node);

  return 0;
}

void *
clib_pmalloc_alloc_aligned_on_numa (clib_pmalloc_main_t * pm, uword size,
				    uword align, u32 numa_node)
{
  return clib_pmalloc_alloc_inline (pm, 0, size, align, numa_node);
}

void *
clib_pmalloc_alloc_aligned (clib_pmalloc_main_t * pm, uword size, uword align)
{
  return clib_pmalloc_alloc_inline (pm, 0, size, align,
				    CLIB_PMALLOC_NUMA_LOCAL);
}

void *
clib_pmalloc_alloc_from_arena (clib_pmalloc_main_t * pm, void *arena_va,
			       uword size, uword align)
{
  clib_pmalloc_arena_t *a = clib_pmalloc_get_arena (pm, arena_va);
  return clib_pmalloc_alloc_inline (pm, a, size, align, 0);
}

void
clib_pmalloc_free (clib_pmalloc_main_t * pm, void *va)
{
  clib_pmalloc_page_t *pp;
  clib_pmalloc_chunk_t *c;
  uword *p;
  u32 chunk_index, page_index;

  p = hash_get (pm->chunk_index_by_va, pointer_to_uword (va));

  if (p == 0)
    os_panic ();

  chunk_index = p[0];
  page_index = clib_pmalloc_get_page_index (pm, va);
  hash_unset (pm->chunk_index_by_va, pointer_to_uword (va));

  pp = vec_elt_at_index (pm->pages, page_index);
  c = pool_elt_at_index (pp->chunks, chunk_index);
  c->used = 0;
  pp->n_free_blocks += c->size;
  pp->n_free_chunks++;

  /* merge with next if free */
  if (c->next != ~0 && get_chunk (pp, c->next)->used == 0)
    {
      clib_pmalloc_chunk_t *next = get_chunk (pp, c->next);
      c->size += next->size;
      c->next = next->next;
      if (next->next != ~0)
	get_chunk (pp, next->next)->prev = chunk_index;
      memset (next, 0, sizeof (*next));
      pool_put (pp->chunks, next);
      pp->n_free_chunks--;
    }

  /* merge with prev if free */
  if (c->prev != ~0 && get_chunk (pp, c->prev)->used == 0)
    {
      clib_pmalloc_chunk_t *prev = get_chunk (pp, c->prev);
      prev->size += c->size;
      prev->next = c->next;
      if (c->next != ~0)
	get_chunk (pp, c->next)->prev = c->prev;
      memset (c, 0, sizeof (*c));
      pool_put (pp->chunks, c);
      pp->n_free_chunks--;
    }
}

static u8 *
format_pmalloc_page (u8 * s, va_list * va)
{
  clib_pmalloc_page_t *pp = va_arg (*va, clib_pmalloc_page_t *);
  int verbose = va_arg (*va, int);
  u32 indent = format_get_indent (s);

  s = format (s, "page %u: phys-addr %p ", pp->index, pp->pa);

  if (pp->chunks == 0)
    return s;

  s = format (s, "free %u chunks %u free-chunks %d ",
	      (pp->n_free_blocks) << PMALLOC_LOG2_BLOCK_SZ,
	      pool_elts (pp->chunks), pp->n_free_chunks);

  if (verbose >= 2)
    {
      clib_pmalloc_chunk_t *c;
      c = pool_elt_at_index (pp->chunks, pp->first_chunk_index);
      s = format (s, "\n%U%12s%12s%8s%8s%8s%8s",
		  format_white_space, indent + 2,
		  "chunk offset", "size", "used", "index", "prev", "next");
      while (1)
	{
	  s = format (s, "\n%U%12u%12u%8s%8d%8d%8d",
		      format_white_space, indent + 2,
		      c->start << PMALLOC_LOG2_BLOCK_SZ,
		      c->size << PMALLOC_LOG2_BLOCK_SZ,
		      c->used ? "yes" : "no",
		      c - pp->chunks, c->prev, c->next);
	  if (c->next == ~0)
	    break;
	  c = pool_elt_at_index (pp->chunks, c->next);
	}
    }
  return s;
}

u8 *
format_pmalloc (u8 * s, va_list * va)
{
  clib_pmalloc_main_t *pm = va_arg (*va, clib_pmalloc_main_t *);
  int verbose = va_arg (*va, int);
  u32 indent = format_get_indent (s);

  clib_pmalloc_page_t *pp;
  clib_pmalloc_arena_t *a;

  s = format (s, "used-pages %u reserved-pages %u pagesize %uKB",
	      vec_len (pm->pages), pm->max_pages,
	      1 << (pm->log2_page_sz - 10));

  if (verbose >= 2)
    s = format (s, " va-start %p", pm->base);

  if (pm->error)
    s = format (s, "\n%Ulast-error: %U", format_white_space, indent + 2,
		format_clib_error, pm->error);


  /* *INDENT-OFF* */
  pool_foreach (a, pm->arenas,
    {
      u32 *page_index;
      s = format (s, "\n%Uarena '%s' pages %u numa-node %u",
		  format_white_space, indent + 2,
		  a->name, vec_len (a->page_indices), a->numa_node);
      if (a->fd != -1)
        s = format (s, " shared fd %d", a->fd);
      if (verbose >= 1)
	vec_foreach (page_index, a->page_indices)
	  {
	    pp = vec_elt_at_index (pm->pages, *page_index);
	    s = format (s, "\n%U%U", format_white_space, indent + 4,
			format_pmalloc_page, pp, verbose);
	  }
    });
  /* *INDENT-ON* */

  return s;
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */