2 *------------------------------------------------------------------
3 * svm.c - shared VM allocation, mmap(...MAP_FIXED...)
6 * Copyright (c) 2009 Cisco and/or its affiliates.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at:
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *------------------------------------------------------------------
23 #include <sys/types.h>
26 #include <netinet/in.h>
33 #include <vppinfra/clib.h>
34 #include <vppinfra/vec.h>
35 #include <vppinfra/hash.h>
36 #include <vppinfra/bitmap.h>
37 #include <vppinfra/fifo.h>
38 #include <vppinfra/time.h>
39 #include <vppinfra/heap.h>
40 #include <vppinfra/pool.h>
41 #include <vppinfra/format.h>
45 static svm_region_t *root_rp;
46 static int root_rp_refcount;
49 static pthread_mutex_t *mutexes_held[MAXLOCK];
53 svm_get_root_rp (void)
61 svm_get_global_region_base_va ()
64 /* On AArch64 VA space can have different size, from 36 to 48 bits.
65 Here we are trying to detect VA bits by parsing /proc/self/maps
68 unformat_input_t input;
72 if ((fd = open ("/proc/self/maps", 0)) < 0)
73 clib_unix_error ("open '/proc/self/maps'");
75 unformat_init_clib_file (&input, fd);
76 while (unformat_check_input (&input) != UNFORMAT_END_OF_INPUT)
78 if (unformat (&input, "%llx-%llx", &start, &end))
80 unformat_skip_line (&input);
82 unformat_free (&input);
85 bits = count_leading_zeros (end);
87 if (bits >= 36 && bits <= 48)
88 return ((1ul << bits) / 4) - (2 * SVM_GLOBAL_REGION_SIZE);
90 clib_unix_error ("unexpected va bits '%u'", bits);
93 #ifdef CLIB_SANITIZE_ADDR
94 return 0x200000000000;
97 return 0x130000000ULL;
101 region_lock (svm_region_t * rp, int tag)
103 pthread_mutex_lock (&rp->mutex);
105 rp->mutex_owner_pid = getpid ();
106 rp->mutex_owner_tag = tag;
108 ASSERT (nheld < MAXLOCK); //NOSONAR
110 * Keep score of held mutexes so we can try to exit
111 * cleanly if the world comes to an end at the worst possible
114 mutexes_held[nheld++] = &rp->mutex;
118 region_unlock (svm_region_t * rp)
122 rp->mutex_owner_pid = 0;
123 rp->mutex_owner_tag = 0;
126 for (i = nheld - 1; i >= 0; i--)
128 if (mutexes_held[i] == &rp->mutex)
130 for (j = i; j < MAXLOCK - 1; j++)
131 mutexes_held[j] = mutexes_held[j + 1];
139 CLIB_MEMORY_BARRIER ();
140 pthread_mutex_unlock (&rp->mutex);
145 format_svm_flags (u8 * s, va_list * args)
147 uword f = va_arg (*args, uword);
149 if (f & SVM_FLAGS_MHEAP)
150 s = format (s, "MHEAP ");
151 if (f & SVM_FLAGS_FILE)
152 s = format (s, "FILE ");
153 if (f & SVM_FLAGS_NODATA)
154 s = format (s, "NODATA ");
155 if (f & SVM_FLAGS_NEED_DATA_INIT)
156 s = format (s, "INIT ");
162 format_svm_size (u8 * s, va_list * args)
164 uword size = va_arg (*args, uword);
166 if (size >= (1 << 20))
168 s = format (s, "(%d mb)", size >> 20);
170 else if (size >= (1 << 10))
172 s = format (s, "(%d kb)", size >> 10);
176 s = format (s, "(%d bytes)", size);
182 format_svm_region (u8 * s, va_list * args)
184 svm_region_t *rp = va_arg (*args, svm_region_t *);
185 int verbose = va_arg (*args, int);
189 s = format (s, "%s: base va 0x%x size 0x%x %U\n",
190 rp->region_name, rp->virtual_base,
191 rp->virtual_size, format_svm_size, rp->virtual_size);
192 s = format (s, " user_ctx 0x%x, bitmap_size %d\n",
193 rp->user_ctx, rp->bitmap_size);
197 s = format (s, " flags: 0x%x %U\n", rp->flags,
198 format_svm_flags, rp->flags);
200 " region_heap 0x%x data_base 0x%x data_heap 0x%x\n",
201 rp->region_heap, rp->data_base, rp->data_heap);
204 s = format (s, " %d clients, pids: ", vec_len (rp->client_pids));
206 for (i = 0; i < vec_len (rp->client_pids); i++)
207 s = format (s, "%d ", rp->client_pids[i]);
209 s = format (s, "\n");
215 s = format (s, " VM in use: ");
217 for (i = 0; i < rp->bitmap_size; i++)
219 if (clib_bitmap_get_no_check (rp->bitmap, i) != 0)
223 hi = lo = rp->virtual_base + i * MMAP_PAGESIZE;
227 hi = rp->virtual_base + i * MMAP_PAGESIZE;
234 hi = rp->virtual_base + i * MMAP_PAGESIZE - 1;
235 s = format (s, " 0x%x - 0x%x (%dk)\n", lo, hi,
248 * Round to a pagesize multiple, presumably 4k works
251 rnd_pagesize (u64 size)
255 rv = (size + (MMAP_PAGESIZE - 1)) & ~(MMAP_PAGESIZE - 1);
260 * svm_data_region_setup
263 svm_data_region_create (svm_map_region_args_t * a, svm_region_t * rp)
269 map_size = rp->virtual_size - (MMAP_PAGESIZE +
270 (a->pvt_heap_size ? a->pvt_heap_size :
271 SVM_PVT_MHEAP_SIZE));
273 if (a->flags & SVM_FLAGS_FILE)
277 fd = open (a->backing_file, O_RDWR | O_CREAT, 0777);
281 clib_unix_warning ("open");
285 if (fstat (fd, &statb) < 0)
287 clib_unix_warning ("fstat");
292 if (statb.st_mode & S_IFREG)
294 if (statb.st_size == 0)
296 if (lseek (fd, map_size, SEEK_SET) == (off_t) - 1)
298 clib_unix_warning ("seek region size");
302 if (write (fd, &junk, 1) != 1)
304 clib_unix_warning ("set region size");
311 map_size = rnd_pagesize (statb.st_size);
316 map_size = a->backing_mmap_size;
319 ASSERT (map_size <= rp->virtual_size -
320 (MMAP_PAGESIZE + SVM_PVT_MHEAP_SIZE));
322 if (mmap (rp->data_base, map_size, PROT_READ | PROT_WRITE,
323 MAP_SHARED | MAP_FIXED, fd, 0) == MAP_FAILED)
325 clib_unix_warning ("mmap");
330 clib_mem_unpoison (rp->data_base, map_size);
331 rp->backing_file = (char *) format (0, "%s%c", a->backing_file, 0);
332 rp->flags |= SVM_FLAGS_FILE;
335 if (a->flags & SVM_FLAGS_MHEAP)
337 rp->data_heap = clib_mem_create_heap (rp->data_base, map_size,
338 1 /* locked */ , "svm data");
340 rp->flags |= SVM_FLAGS_MHEAP;
346 svm_data_region_map (svm_map_region_args_t * a, svm_region_t * rp)
353 map_size = rp->virtual_size -
355 + (a->pvt_heap_size ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE));
357 if (a->flags & SVM_FLAGS_FILE)
360 fd = open (a->backing_file, O_RDWR, 0777);
364 clib_unix_warning ("open");
368 if (fstat (fd, &statb) < 0)
370 clib_unix_warning ("fstat");
375 if (statb.st_mode & S_IFREG)
377 if (statb.st_size == 0)
379 if (lseek (fd, map_size, SEEK_SET) == (off_t) - 1)
381 clib_unix_warning ("seek region size");
385 if (write (fd, &junk, 1) != 1)
387 clib_unix_warning ("set region size");
394 map_size = rnd_pagesize (statb.st_size);
399 map_size = a->backing_mmap_size;
402 ASSERT (map_size <= rp->virtual_size
405 (a->pvt_heap_size ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE)));
407 if (mmap (rp->data_base, map_size, PROT_READ | PROT_WRITE,
408 MAP_SHARED | MAP_FIXED, fd, 0) == MAP_FAILED)
410 clib_unix_warning ("mmap");
415 clib_mem_unpoison (rp->data_base, map_size);
421 shm_name_from_svm_map_region_args (svm_map_region_args_t * a)
424 int root_path_offset = 0;
429 /* Tolerate present or absent slashes */
430 if (a->root_path[0] == '/')
433 if (a->name[0] == '/')
436 shm_name = format (0, "/%s-%s%c", &a->root_path[root_path_offset],
437 &a->name[name_offset], 0);
440 shm_name = format (0, "%s%c", a->name, 0);
445 svm_region_init_mapped_region (svm_map_region_args_t * a, svm_region_t * rp)
447 pthread_mutexattr_t attr;
448 pthread_condattr_t cattr;
449 int nbits, words, bit;
456 clib_memset (rp, 0, sizeof (*rp));
458 if (pthread_mutexattr_init (&attr))
459 clib_unix_warning ("mutexattr_init");
461 if (pthread_mutexattr_setpshared (&attr, PTHREAD_PROCESS_SHARED))
462 clib_unix_warning ("mutexattr_setpshared");
464 if (pthread_mutex_init (&rp->mutex, &attr))
465 clib_unix_warning ("mutex_init");
467 if (pthread_mutexattr_destroy (&attr))
468 clib_unix_warning ("mutexattr_destroy");
470 if (pthread_condattr_init (&cattr))
471 clib_unix_warning ("condattr_init");
473 if (pthread_condattr_setpshared (&cattr, PTHREAD_PROCESS_SHARED))
474 clib_unix_warning ("condattr_setpshared");
476 if (pthread_cond_init (&rp->condvar, &cattr))
477 clib_unix_warning ("cond_init");
479 if (pthread_condattr_destroy (&cattr))
480 clib_unix_warning ("condattr_destroy");
484 rp->virtual_base = a->baseva;
485 rp->virtual_size = a->size;
487 rp->region_heap = clib_mem_create_heap
488 (uword_to_pointer (a->baseva + MMAP_PAGESIZE, void *),
490 0) ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE, 1 /* locked */ ,
493 oldheap = svm_push_pvt_heap (rp);
495 rp->region_name = (char *) format (0, "%s%c", a->name, 0);
496 vec_add1 (rp->client_pids, getpid ());
498 nbits = rp->virtual_size / MMAP_PAGESIZE;
501 rp->bitmap_size = nbits;
502 words = (nbits + BITS (uword) - 1) / BITS (uword);
503 vec_validate (rp->bitmap, words - 1);
505 overhead_space = MMAP_PAGESIZE /* header */ +
506 ((a->pvt_heap_size != 0) ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE);
509 data_base = (uword) rp->virtual_base;
511 if (a->flags & SVM_FLAGS_NODATA)
512 rp->flags |= SVM_FLAGS_NEED_DATA_INIT;
516 clib_bitmap_set_no_check (rp->bitmap, bit, 1);
518 overhead_space -= MMAP_PAGESIZE;
519 data_base += MMAP_PAGESIZE;
521 while (overhead_space > 0);
523 rp->data_base = (void *) data_base;
526 * Note: although the POSIX spec guarantees that only one
527 * process enters this block, we have to play games
528 * to hold off clients until e.g. the mutex is ready
530 rp->version = SVM_VERSION;
532 /* setup the data portion of the region */
534 rv = svm_data_region_create (a, rp);
537 clib_warning ("data_region_create: %d", rv);
542 svm_pop_heap (oldheap);
549 svm_map_region (svm_map_region_args_t * a)
557 int pid_holding_region_lock;
559 int dead_region_recovery = 0;
562 struct timespec ts, tsrem;
564 ASSERT ((a->size & ~(MMAP_PAGESIZE - 1)) == a->size);
567 shm_name = shm_name_from_svm_map_region_args (a);
570 clib_warning ("[%d] map region %s: shm_open (%s)",
571 getpid (), a->name, shm_name);
573 svm_fd = shm_open ((char *) shm_name, O_RDWR | O_CREAT | O_EXCL, 0777);
577 if (fchmod (svm_fd, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP) < 0)
578 clib_unix_warning ("segment chmod");
579 /* This turns out to fail harmlessly if the client starts first */
580 if (fchown (svm_fd, a->uid, a->gid) < 0)
581 clib_unix_warning ("segment chown [ok if client starts first]");
585 if (lseek (svm_fd, a->size, SEEK_SET) == (off_t) - 1)
587 clib_warning ("seek region size");
591 if (write (svm_fd, &junk, 1) != 1)
593 clib_warning ("set region size");
598 rp = mmap (uword_to_pointer (a->baseva, void *), a->size,
599 PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, svm_fd, 0);
601 if (rp == (svm_region_t *) MAP_FAILED)
603 clib_unix_warning ("mmap create");
608 clib_mem_unpoison (rp, a->size);
610 svm_region_init_mapped_region (a, rp);
612 return ((void *) rp);
616 svm_fd = shm_open ((char *) shm_name, O_RDWR, 0777);
622 perror ("svm_region_map(mmap open)");
626 /* Reset ownership in case the client started first */
627 if (fchown (svm_fd, a->uid, a->gid) < 0)
628 clib_unix_warning ("segment chown [ok if client starts first]");
633 if (0 != fstat (svm_fd, &stat))
635 clib_warning ("fstat failed: %d", errno);
639 if (stat.st_size > 0)
645 clib_warning ("waiting for resize of shm file timed out");
650 ts.tv_nsec = 100000000;
651 while (nanosleep (&ts, &tsrem) < 0)
656 rp = mmap (0, MMAP_PAGESIZE,
657 PROT_READ | PROT_WRITE, MAP_SHARED, svm_fd, 0);
659 if (rp == (svm_region_t *) MAP_FAILED)
662 clib_warning ("mmap");
666 clib_mem_unpoison (rp, MMAP_PAGESIZE);
669 * We lost the footrace to create this region; make sure
670 * the winner has crossed the finish line.
672 while (rp->version == 0 && deadman++ < 5)
680 if (rp->version == 0)
682 clib_warning ("rp->version %d not %d", rp->version, SVM_VERSION);
684 munmap (rp, a->size);
687 /* Remap now that the region has been placed */
688 a->baseva = rp->virtual_base;
689 a->size = rp->virtual_size;
690 munmap (rp, MMAP_PAGESIZE);
692 rp = (void *) mmap (uword_to_pointer (a->baseva, void *), a->size,
693 PROT_READ | PROT_WRITE,
694 MAP_SHARED | MAP_FIXED, svm_fd, 0);
695 if ((uword) rp == (uword) MAP_FAILED)
697 clib_unix_warning ("mmap");
704 clib_mem_unpoison (rp, a->size);
706 if ((uword) rp != rp->virtual_base)
708 clib_warning ("mmap botch");
712 * Try to fix the region mutex if it is held by
715 pid_holding_region_lock = rp->mutex_owner_pid;
716 if (pid_holding_region_lock && kill (pid_holding_region_lock, 0) < 0)
718 pthread_mutexattr_t attr;
720 ("region %s mutex held by dead pid %d, tag %d, force unlock",
721 rp->region_name, pid_holding_region_lock, rp->mutex_owner_tag);
722 /* owner pid is nonexistent */
723 if (pthread_mutexattr_init (&attr))
724 clib_unix_warning ("mutexattr_init");
725 if (pthread_mutexattr_setpshared (&attr, PTHREAD_PROCESS_SHARED))
726 clib_unix_warning ("mutexattr_setpshared");
727 if (pthread_mutex_init (&rp->mutex, &attr))
728 clib_unix_warning ("mutex_init");
729 dead_region_recovery = 1;
732 if (dead_region_recovery)
733 clib_warning ("recovery: attempt to re-lock region");
736 oldheap = svm_push_pvt_heap (rp);
737 vec_add1 (rp->client_pids, getpid ());
739 if (dead_region_recovery)
740 clib_warning ("recovery: attempt svm_data_region_map");
742 rv = svm_data_region_map (a, rp);
745 clib_warning ("data_region_map: %d", rv);
748 if (dead_region_recovery)
749 clib_warning ("unlock and continue");
753 svm_pop_heap (oldheap);
755 return ((void *) rp);
758 return 0; /* NOTREACHED *///NOSONAR
762 svm_mutex_cleanup (void)
765 for (i = 0; i < nheld; i++)
767 pthread_mutex_unlock (mutexes_held[i]); //NOSONAR
772 svm_region_init_internal (svm_map_region_args_t * a)
775 u64 ticks = clib_cpu_time_now ();
776 uword randomize_baseva;
778 /* guard against klutz calls */
784 atexit (svm_mutex_cleanup);
786 /* Randomize the shared-VM base at init time */
787 if (MMAP_PAGESIZE <= (4 << 10))
788 randomize_baseva = (ticks & 15) * MMAP_PAGESIZE;
790 randomize_baseva = (ticks & 3) * MMAP_PAGESIZE;
792 a->baseva += randomize_baseva;
794 rp = svm_map_region (a);
800 /* Set up the main region data structures */
801 if (rp->flags & SVM_FLAGS_NEED_DATA_INIT)
803 svm_main_region_t *mp = 0;
806 rp->flags &= ~(SVM_FLAGS_NEED_DATA_INIT);
808 oldheap = svm_push_pvt_heap (rp);
809 vec_validate (mp, 0);
810 mp->name_hash = hash_create_string (0, sizeof (uword));
811 mp->root_path = a->root_path ? format (0, "%s%c", a->root_path, 0) : 0;
815 svm_pop_heap (oldheap);
824 svm_region_init (void)
826 svm_map_region_args_t _a, *a = &_a;
828 clib_memset (a, 0, sizeof (*a));
830 a->name = SVM_GLOBAL_REGION_NAME;
831 a->baseva = svm_get_global_region_base_va ();
832 a->size = SVM_GLOBAL_REGION_SIZE;
833 a->flags = SVM_FLAGS_NODATA;
837 svm_region_init_internal (a);
841 svm_region_init_chroot (const char *root_path)
843 svm_map_region_args_t _a, *a = &_a;
845 clib_memset (a, 0, sizeof (*a));
846 a->root_path = root_path;
847 a->name = SVM_GLOBAL_REGION_NAME;
848 a->baseva = svm_get_global_region_base_va ();
849 a->size = SVM_GLOBAL_REGION_SIZE;
850 a->flags = SVM_FLAGS_NODATA;
854 return svm_region_init_internal (a);
858 svm_region_init_chroot_uid_gid (const char *root_path, int uid, int gid)
860 svm_map_region_args_t _a, *a = &_a;
862 clib_memset (a, 0, sizeof (*a));
863 a->root_path = root_path;
864 a->name = SVM_GLOBAL_REGION_NAME;
865 a->baseva = svm_get_global_region_base_va ();
866 a->size = SVM_GLOBAL_REGION_SIZE;
867 a->flags = SVM_FLAGS_NODATA;
871 svm_region_init_internal (a);
875 svm_region_init_args (svm_map_region_args_t * a)
877 svm_region_init_internal (a);
881 svm_region_find_or_create (svm_map_region_args_t * a)
883 svm_main_region_t *mp;
890 svm_subregion_t *subp;
894 a->size += MMAP_PAGESIZE +
895 ((a->pvt_heap_size != 0) ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE);
896 a->size = rnd_pagesize (a->size);
898 region_lock (root_rp, 4);
899 oldheap = svm_push_pvt_heap (root_rp);
900 mp = root_rp->data_base;
904 /* Map the named region from the correct chroot environment */
905 if (a->root_path == NULL)
906 a->root_path = (char *) mp->root_path;
909 * See if this region is already known. If it is, we're
912 p = hash_get_mem (mp->name_hash, a->name);
916 rp = svm_map_region (a);
917 region_unlock (root_rp);
918 svm_pop_heap (oldheap);
922 /* Create the region. */
923 ASSERT ((a->size & ~(MMAP_PAGESIZE - 1)) == a->size);
925 need_nbits = a->size / MMAP_PAGESIZE;
927 index = 1; /* $$$ fixme, figure out how many bit to really skip */
930 * Scan the virtual space allocation bitmap, looking for a large
935 if (clib_bitmap_get_no_check (root_rp->bitmap, index) == 0)
937 for (i = 0; i < (need_nbits - 1); i++)
939 if (clib_bitmap_get_no_check (root_rp->bitmap, index + i) == 1)
950 while (index < root_rp->bitmap_size);
952 /* Completely out of VM? */
953 if (index >= root_rp->bitmap_size)
955 clib_warning ("region %s: not enough VM to allocate 0x%llx (%lld)",
956 root_rp->region_name, a->size, a->size);
957 svm_pop_heap (oldheap);
958 region_unlock (root_rp);
963 * Mark virtual space allocated
966 clib_warning ("set %d bits at index %d", need_nbits, index);
969 for (i = 0; i < need_nbits; i++)
971 clib_bitmap_set_no_check (root_rp->bitmap, index + i, 1);
974 /* Place this region where it goes... */
975 a->baseva = root_rp->virtual_base + index * MMAP_PAGESIZE;
977 rp = svm_map_region (a);
979 pool_get (mp->subregions, subp);
980 name = format (0, "%s%c", a->name, 0);
981 subp->subregion_name = name;
983 hash_set_mem (mp->name_hash, name, subp - mp->subregions);
985 svm_pop_heap (oldheap);
987 region_unlock (root_rp);
993 svm_region_unlink (svm_region_t * rp)
995 svm_map_region_args_t _a, *a = &_a;
996 svm_main_region_t *mp;
1001 ASSERT (vec_c_string_is_terminated (rp->region_name));
1003 mp = root_rp->data_base;
1006 a->root_path = (char *) mp->root_path;
1007 a->name = rp->region_name;
1008 shm_name = shm_name_from_svm_map_region_args (a);
1010 clib_warning ("[%d] shm_unlink (%s)", getpid (), shm_name);
1011 shm_unlink ((const char *) shm_name);
1012 vec_free (shm_name);
1018 * Let go of the indicated region. If the calling process
1019 * is the last customer, throw it away completely.
1020 * The root region mutex guarantees atomicity with respect to
1021 * a new region client showing up at the wrong moment.
1024 svm_region_unmap_internal (void *rp_arg, u8 is_client)
1026 int i, mypid = getpid ();
1029 uword virtual_base, virtual_size;
1030 svm_region_t *rp = rp_arg;
1034 * If we take a signal while holding one or more shared-memory
1035 * mutexes, we may end up back here from an otherwise
1036 * benign exit handler. Bail out to avoid a recursive
1046 clib_warning ("[%d] unmap region %s", getpid (), rp->region_name);
1048 region_lock (root_rp, 5);
1049 region_lock (rp, 6);
1051 oldheap = svm_push_pvt_heap (rp); /* nb vec_delete() in the loop */
1053 /* Remove the caller from the list of mappers */
1054 clib_mem_unpoison (rp->client_pids, vec_bytes (rp->client_pids));
1055 for (i = 0; i < vec_len (rp->client_pids); i++)
1057 if (rp->client_pids[i] == mypid)
1059 vec_delete (rp->client_pids, 1, i);
1063 clib_warning ("pid %d AWOL", mypid);
1067 svm_pop_heap (oldheap);
1069 nclients_left = vec_len (rp->client_pids);
1070 virtual_base = rp->virtual_base;
1071 virtual_size = rp->virtual_size;
1073 if (nclients_left == 0)
1075 int index, nbits, i;
1076 svm_main_region_t *mp;
1078 svm_subregion_t *subp;
1080 /* Kill the region, last guy on his way out */
1082 oldheap = svm_push_pvt_heap (root_rp);
1083 name = vec_dup (rp->region_name);
1085 virtual_base = rp->virtual_base;
1086 virtual_size = rp->virtual_size;
1088 /* Figure out which bits to clear in the root region bitmap */
1089 index = (virtual_base - root_rp->virtual_base) / MMAP_PAGESIZE;
1091 nbits = (virtual_size + MMAP_PAGESIZE - 1) / MMAP_PAGESIZE;
1094 clib_warning ("clear %d bits at index %d", nbits, index);
1096 /* Give back the allocated VM */
1097 for (i = 0; i < nbits; i++)
1099 clib_bitmap_set_no_check (root_rp->bitmap, index + i, 0);
1102 mp = root_rp->data_base;
1104 p = hash_get_mem (mp->name_hash, name);
1106 /* Better never happen ... */
1110 region_unlock (root_rp);
1111 svm_pop_heap (oldheap);
1112 clib_warning ("Region name '%s' not found?", name);
1116 /* Remove from the root region subregion pool */
1117 subp = mp->subregions + p[0];
1118 pool_put (mp->subregions, subp);
1120 hash_unset_mem (mp->name_hash, name);
1126 /* If a client asks for the cleanup, don't unlink the backing
1127 * file since we can't tell if it has been recreated. */
1129 svm_region_unlink (rp);
1131 munmap ((void *) virtual_base, virtual_size);
1132 region_unlock (root_rp);
1133 svm_pop_heap (oldheap);
1138 region_unlock (root_rp);
1140 munmap ((void *) virtual_base, virtual_size);
1144 svm_region_unmap (void *rp_arg)
1146 svm_region_unmap_internal (rp_arg, 0 /* is_client */ );
1150 svm_region_unmap_client (void *rp_arg)
1152 svm_region_unmap_internal (rp_arg, 1 /* is_client */ );
1159 svm_region_exit_internal (u8 is_client)
1162 int i, mypid = getpid ();
1163 uword virtual_base, virtual_size;
1165 /* It felt so nice we did it twice... */
1169 if (--root_rp_refcount > 0)
1173 * If we take a signal while holding one or more shared-memory
1174 * mutexes, we may end up back here from an otherwise
1175 * benign exit handler. Bail out to avoid a recursive
1181 region_lock (root_rp, 7);
1182 oldheap = svm_push_pvt_heap (root_rp);
1184 virtual_base = root_rp->virtual_base;
1185 virtual_size = root_rp->virtual_size;
1187 clib_mem_unpoison (root_rp->client_pids, vec_bytes (root_rp->client_pids));
1188 for (i = 0; i < vec_len (root_rp->client_pids); i++)
1190 if (root_rp->client_pids[i] == mypid)
1192 vec_delete (root_rp->client_pids, 1, i);
1196 clib_warning ("pid %d AWOL", mypid);
1200 if (!is_client && vec_len (root_rp->client_pids) == 0)
1201 svm_region_unlink (root_rp);
1203 region_unlock (root_rp);
1204 svm_pop_heap (oldheap);
1207 munmap ((void *) virtual_base, virtual_size);
1211 svm_region_exit (void)
1213 svm_region_exit_internal (0 /* is_client */ );
1217 svm_region_exit_client (void)
1219 svm_region_exit_internal (1 /* is_client */ );
1223 svm_client_scan_this_region_nolock (svm_region_t * rp)
1226 int mypid = getpid ();
1229 for (j = 0; j < vec_len (rp->client_pids); j++)
1231 if (mypid == rp->client_pids[j])
1233 if (rp->client_pids[j] && (kill (rp->client_pids[j], 0) < 0))
1235 clib_warning ("%s: cleanup ghost pid %d",
1236 rp->region_name, rp->client_pids[j]);
1237 /* nb: client vec in rp->region_heap */
1238 oldheap = svm_push_pvt_heap (rp);
1239 vec_delete (rp->client_pids, 1, j);
1241 svm_pop_heap (oldheap);
1248 * Scan svm regions for dead clients
1251 svm_client_scan (const char *root_path)
1254 svm_main_region_t *mp;
1255 svm_map_region_args_t *a = 0;
1256 svm_region_t *root_rp;
1258 svm_subregion_t *subp;
1262 int mypid = getpid ();
1264 vec_validate (a, 0);
1266 svm_region_init_chroot (root_path);
1268 root_rp = svm_get_root_rp ();
1270 pthread_mutex_lock (&root_rp->mutex);
1272 mp = root_rp->data_base;
1274 for (j = 0; j < vec_len (root_rp->client_pids); j++)
1276 if (mypid == root_rp->client_pids[j])
1278 if (root_rp->client_pids[j] && (kill (root_rp->client_pids[j], 0) < 0))
1280 clib_warning ("%s: cleanup ghost pid %d",
1281 root_rp->region_name, root_rp->client_pids[j]);
1282 /* nb: client vec in root_rp->region_heap */
1283 oldheap = svm_push_pvt_heap (root_rp);
1284 vec_delete (root_rp->client_pids, 1, j);
1286 svm_pop_heap (oldheap);
1291 * Snapshoot names, can't hold root rp mutex across
1295 pool_foreach (subp, mp->subregions) {
1296 name = vec_dup (subp->subregion_name);
1297 vec_add1(svm_names, name);
1301 pthread_mutex_unlock (&root_rp->mutex);
1303 for (i = 0; i < vec_len (svm_names); i++)
1305 vec_validate (a, 0);
1306 a->root_path = root_path;
1307 a->name = (char *) svm_names[i];
1308 rp = svm_region_find_or_create (a);
1311 pthread_mutex_lock (&rp->mutex);
1313 svm_client_scan_this_region_nolock (rp);
1315 pthread_mutex_unlock (&rp->mutex);
1316 svm_region_unmap (rp);
1317 vec_free (svm_names[i]);
1321 vec_free (svm_names);
1329 * fd.io coding-style-patch-verification: ON
1332 * eval: (c-set-style "gnu")