aboutsummaryrefslogtreecommitdiffstats
path: root/src/vlib/linux/physmem.c
blob: 1a449921857b37a76237237d435a00ed5f01c8c0 (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
/*
 * Copyright (c) 2015 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.
 */
/*
 * physmem.c: Unix physical memory
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <unistd.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/mman.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <unistd.h>

#include <vppinfra/linux/syscall.h>
#include <vppinfra/linux/sysfs.h>
#include <vlib/vlib.h>
#include <vlib/physmem.h>
#include <vlib/unix/unix.h>
#include <vlib/pci/pci.h>
#include <vlib/linux/vfio.h>

static void *
unix_physmem_alloc_aligned (vlib_main_t * vm, vlib_physmem_region_index_t idx,
			    uword n_bytes, uword alignment)
{
  vlib_physmem_region_t *pr = vlib_physmem_get_region (vm, idx);
  uword lo_offset, hi_offset;
  uword *to_free = 0;

  if (pr->heap == 0)
    return 0;

  /* IO memory is always at least cache aligned. */
  alignment = clib_max (alignment, CLIB_CACHE_LINE_BYTES);

  while (1)
    {
      mheap_get_aligned (pr->heap, n_bytes,
			 /* align */ alignment,
			 /* align offset */ 0,
			 &lo_offset);

      /* Allocation failed? */
      if (lo_offset == ~0)
	break;

      /* Make sure allocation does not span DMA physical chunk boundary. */
      hi_offset = lo_offset + n_bytes - 1;

      if (((pointer_to_uword (pr->heap) + lo_offset) >> pr->log2_page_size) ==
	  ((pointer_to_uword (pr->heap) + hi_offset) >> pr->log2_page_size))
	break;

      /* Allocation would span chunk boundary, queue it to be freed as soon as
         we find suitable chunk. */
      vec_add1 (to_free, lo_offset);
    }

  if (to_free != 0)
    {
      uword i;
      for (i = 0; i < vec_len (to_free); i++)
	mheap_put (pr->heap, to_free[i]);
      vec_free (to_free);
    }

  return lo_offset != ~0 ? pr->heap + lo_offset : 0;
}

static void
unix_physmem_free (vlib_main_t * vm, vlib_physmem_region_index_t idx, void *x)
{
  vlib_physmem_region_t *pr = vlib_physmem_get_region (vm, idx);
  /* Return object to region's heap. */
  mheap_put (pr->heap, x - pr->heap);
}

static clib_error_t *
unix_physmem_region_alloc (vlib_main_t * vm, char *name, u32 size,
			   u8 numa_node, u32 flags,
			   vlib_physmem_region_index_t * idx)
{
  vlib_physmem_main_t *vpm = &physmem_main;
  vlib_physmem_region_t *pr;
  clib_error_t *error = 0;
  clib_mem_vm_alloc_t alloc = { 0 };
  int i;

  pool_get (vpm->regions, pr);

  if ((pr - vpm->regions) >= 256)
    {
      error = clib_error_return (0, "maximum number of regions reached");
      goto error;
    }

  alloc.name = name;
  alloc.size = size;
  alloc.numa_node = numa_node;

  alloc.flags = (flags & VLIB_PHYSMEM_F_SHARED) ?
    CLIB_MEM_VM_F_SHARED : CLIB_MEM_VM_F_LOCKED;

  if ((flags & VLIB_PHYSMEM_F_HUGETLB))
    {
      alloc.flags |= CLIB_MEM_VM_F_HUGETLB;
      alloc.flags |= CLIB_MEM_VM_F_HUGETLB_PREALLOC;
      alloc.flags |= CLIB_MEM_VM_F_NUMA_FORCE;
    }
  else
    {
      alloc.flags |= CLIB_MEM_VM_F_NUMA_PREFER;
    }

  error = clib_mem_vm_ext_alloc (&alloc);
  if (error)
    goto error;

  pr->index = pr - vpm->regions;
  pr->flags = flags;
  pr->fd = alloc.fd;
  pr->mem = alloc.addr;
  pr->log2_page_size = alloc.log2_page_size;
  pr->n_pages = alloc.n_pages;
  pr->size = (u64) pr->n_pages << (u64) pr->log2_page_size;
  pr->page_mask = (1 << pr->log2_page_size) - 1;
  pr->numa_node = numa_node;
  pr->name = format (0, "%s", name);

  for (i = 0; i < pr->n_pages; i++)
    {
      void *ptr = pr->mem + (i << pr->log2_page_size);
      int node;
      if ((move_pages (0, 1, &ptr, 0, &node, 0) == 0) && (numa_node != node))
	{
	  clib_warning ("physmem page for region \'%s\' allocated on the"
			" wrong numa node (requested %u actual %u)",
			pr->name, pr->numa_node, node, i);
	  break;
	}
    }

  pr->page_table = clib_mem_vm_get_paddr (pr->mem, pr->log2_page_size,
					  pr->n_pages);

  linux_vfio_dma_map_regions (vm);

  if (flags & VLIB_PHYSMEM_F_INIT_MHEAP)
    {
      pr->heap = mheap_alloc_with_flags (pr->mem, pr->size,
					 /* Don't want mheap mmap/munmap with IO memory. */
					 MHEAP_FLAG_DISABLE_VM |
					 MHEAP_FLAG_THREAD_SAFE);
    }

  *idx = pr->index;

  goto done;

error:
  memset (pr, 0, sizeof (*pr));
  pool_put (vpm->regions, pr);

done:
  return error;
}

static void
unix_physmem_region_free (vlib_main_t * vm, vlib_physmem_region_index_t idx)
{
  vlib_physmem_main_t *vpm = &physmem_main;
  vlib_physmem_region_t *pr = vlib_physmem_get_region (vm, idx);

  if (pr->fd > 0)
    close (pr->fd);
  munmap (pr->mem, pr->size);
  vec_free (pr->name);
  pool_put (vpm->regions, pr);
}

clib_error_t *
unix_physmem_init (vlib_main_t * vm)
{
  vlib_physmem_main_t *vpm = &physmem_main;
  clib_error_t *error = 0;
  u64 *pt = 0;

  /* Avoid multiple calls. */
  if (vm->os_physmem_alloc_aligned)
    return error;

  /* check if pagemap is accessible */
  pt = clib_mem_vm_get_paddr (&pt, min_log2 (sysconf (_SC_PAGESIZE)), 1);
  if (pt[0])
    vpm->flags |= VLIB_PHYSMEM_MAIN_F_HAVE_PAGEMAP;
  vec_free (pt);

  if ((error = linux_vfio_init (vm)))
    return error;

  vm->os_physmem_alloc_aligned = unix_physmem_alloc_aligned;
  vm->os_physmem_free = unix_physmem_free;
  vm->os_physmem_region_alloc = unix_physmem_region_alloc;
  vm->os_physmem_region_free = unix_physmem_region_free;

  return error;
}

static clib_error_t *
show_physmem (vlib_main_t * vm,
	      unformat_input_t * input, vlib_cli_command_t * cmd)
{
  vlib_physmem_main_t *vpm = &physmem_main;
  vlib_physmem_region_t *pr;

  /* *INDENT-OFF* */
  pool_foreach (pr, vpm->regions, (
    {
      vlib_cli_output (vm, "index %u name '%s' page-size %uKB num-pages %d "
		       "numa-node %u fd %d\n",
		       pr->index, pr->name, (1 << (pr->log2_page_size -10)),
		       pr->n_pages, pr->numa_node, pr->fd);
      if (pr->heap)
	vlib_cli_output (vm, "  %U", format_mheap, pr->heap, /* verbose */ 1);
      else
	vlib_cli_output (vm, "  no heap\n");
    }));
  /* *INDENT-ON* */
  return 0;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (show_physmem_command, static) = {
  .path = "show physmem",
  .short_help = "Show physical memory allocation",
  .function = show_physmem,
};
/* *INDENT-ON* */

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