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-rw-r--r--svm/svm.c1237
1 files changed, 0 insertions, 1237 deletions
diff --git a/svm/svm.c b/svm/svm.c
deleted file mode 100644
index e4ca98e1ed2..00000000000
--- a/svm/svm.c
+++ /dev/null
@@ -1,1237 +0,0 @@
-/*
- *------------------------------------------------------------------
- * svm.c - shared VM allocation, mmap(...MAP_FIXED...)
- * library
- *
- * Copyright (c) 2009 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.
- *------------------------------------------------------------------
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <netinet/in.h>
-#include <signal.h>
-#include <pthread.h>
-#include <unistd.h>
-#include <time.h>
-#include <fcntl.h>
-#include <string.h>
-#include <vppinfra/clib.h>
-#include <vppinfra/vec.h>
-#include <vppinfra/hash.h>
-#include <vppinfra/bitmap.h>
-#include <vppinfra/fifo.h>
-#include <vppinfra/time.h>
-#include <vppinfra/mheap.h>
-#include <vppinfra/heap.h>
-#include <vppinfra/pool.h>
-#include <vppinfra/format.h>
-
-#include "svm.h"
-
-static svm_region_t *root_rp;
-static int root_rp_refcount;
-
-#define MAXLOCK 2
-static pthread_mutex_t *mutexes_held[MAXLOCK];
-static int nheld;
-
-svm_region_t *
-svm_get_root_rp (void)
-{
- return root_rp;
-}
-
-#define MUTEX_DEBUG
-
-static void
-region_lock (svm_region_t * rp, int tag)
-{
- pthread_mutex_lock (&rp->mutex);
-#ifdef MUTEX_DEBUG
- rp->mutex_owner_pid = getpid ();
- rp->mutex_owner_tag = tag;
-#endif
- ASSERT (nheld < MAXLOCK);
- /*
- * Keep score of held mutexes so we can try to exit
- * cleanly if the world comes to an end at the worst possible
- * moment
- */
- mutexes_held[nheld++] = &rp->mutex;
-}
-
-static void
-region_unlock (svm_region_t * rp)
-{
- int i, j;
-#ifdef MUTEX_DEBUG
- rp->mutex_owner_pid = 0;
- rp->mutex_owner_tag = 0;
-#endif
-
- for (i = nheld - 1; i >= 0; i--)
- {
- if (mutexes_held[i] == &rp->mutex)
- {
- for (j = i; j < MAXLOCK - 1; j++)
- mutexes_held[j] = mutexes_held[j + 1];
- nheld--;
- goto found;
- }
- }
- ASSERT (0);
-
-found:
- CLIB_MEMORY_BARRIER ();
- pthread_mutex_unlock (&rp->mutex);
-}
-
-
-static u8 *
-format_svm_flags (u8 * s, va_list * args)
-{
- uword f = va_arg (*args, uword);
-
- if (f & SVM_FLAGS_MHEAP)
- s = format (s, "MHEAP ");
- if (f & SVM_FLAGS_FILE)
- s = format (s, "FILE ");
- if (f & SVM_FLAGS_NODATA)
- s = format (s, "NODATA ");
- if (f & SVM_FLAGS_NEED_DATA_INIT)
- s = format (s, "INIT ");
-
- return (s);
-}
-
-static u8 *
-format_svm_size (u8 * s, va_list * args)
-{
- uword size = va_arg (*args, uword);
-
- if (size >= (1 << 20))
- {
- s = format (s, "(%d mb)", size >> 20);
- }
- else if (size >= (1 << 10))
- {
- s = format (s, "(%d kb)", size >> 10);
- }
- else
- {
- s = format (s, "(%d bytes)", size);
- }
- return (s);
-}
-
-u8 *
-format_svm_region (u8 * s, va_list * args)
-{
- svm_region_t *rp = va_arg (*args, svm_region_t *);
- int verbose = va_arg (*args, int);
- int i;
- uword lo, hi;
-
- s = format (s, "%s: base va 0x%x size 0x%x %U\n",
- rp->region_name, rp->virtual_base,
- rp->virtual_size, format_svm_size, rp->virtual_size);
- s = format (s, " user_ctx 0x%x, bitmap_size %d\n",
- rp->user_ctx, rp->bitmap_size);
-
- if (verbose)
- {
- s = format (s, " flags: 0x%x %U\n", rp->flags,
- format_svm_flags, rp->flags);
- s = format (s,
- " region_heap 0x%x data_base 0x%x data_heap 0x%x\n",
- rp->region_heap, rp->data_base, rp->data_heap);
- }
-
- s = format (s, " %d clients, pids: ", vec_len (rp->client_pids));
-
- for (i = 0; i < vec_len (rp->client_pids); i++)
- s = format (s, "%d ", rp->client_pids[i]);
-
- s = format (s, "\n");
-
- if (verbose)
- {
- lo = hi = ~0;
-
- s = format (s, " VM in use: ");
-
- for (i = 0; i < rp->bitmap_size; i++)
- {
- if (clib_bitmap_get_no_check (rp->bitmap, i) != 0)
- {
- if (lo == ~0)
- {
- hi = lo = rp->virtual_base + i * MMAP_PAGESIZE;
- }
- else
- {
- hi = rp->virtual_base + i * MMAP_PAGESIZE;
- }
- }
- else
- {
- if (lo != ~0)
- {
- hi = rp->virtual_base + i * MMAP_PAGESIZE - 1;
- s = format (s, " 0x%x - 0x%x (%dk)\n", lo, hi,
- (hi - lo) >> 10);
- lo = hi = ~0;
- }
- }
- }
- s = format (s, " rgn heap stats: %U", format_mheap,
- rp->region_heap, 0);
- if ((rp->flags & SVM_FLAGS_MHEAP) && rp->data_heap)
- {
- s = format (s, "\n data heap stats: %U", format_mheap,
- rp->data_heap, 1);
- }
- s = format (s, "\n");
- }
-
- return (s);
-}
-
-/*
- * rnd_pagesize
- * Round to a pagesize multiple, presumably 4k works
- */
-static u64
-rnd_pagesize (u64 size)
-{
- u64 rv;
-
- rv = (size + (MMAP_PAGESIZE - 1)) & ~(MMAP_PAGESIZE - 1);
- return (rv);
-}
-
-/*
- * svm_data_region_setup
- */
-static int
-svm_data_region_create (svm_map_region_args_t * a, svm_region_t * rp)
-{
- int fd;
- u8 junk = 0;
- uword map_size;
-
- map_size = rp->virtual_size - (MMAP_PAGESIZE +
- (a->pvt_heap_size ? a->pvt_heap_size :
- SVM_PVT_MHEAP_SIZE));
-
- if (a->flags & SVM_FLAGS_FILE)
- {
- struct stat statb;
-
- fd = open (a->backing_file, O_RDWR | O_CREAT, 0777);
-
- if (fd < 0)
- {
- clib_unix_warning ("open");
- return -1;
- }
-
- if (fstat (fd, &statb) < 0)
- {
- clib_unix_warning ("fstat");
- close (fd);
- return -2;
- }
-
- if (statb.st_mode & S_IFREG)
- {
- if (statb.st_size == 0)
- {
- if (lseek (fd, map_size, SEEK_SET) == (off_t) - 1)
- {
- clib_unix_warning ("seek region size");
- close (fd);
- return -3;
- }
- if (write (fd, &junk, 1) != 1)
- {
- clib_unix_warning ("set region size");
- close (fd);
- return -3;
- }
- }
- else
- {
- map_size = rnd_pagesize (statb.st_size);
- }
- }
- else
- {
- map_size = a->backing_mmap_size;
- }
-
- ASSERT (map_size <= rp->virtual_size -
- (MMAP_PAGESIZE + SVM_PVT_MHEAP_SIZE));
-
- if (mmap (rp->data_base, map_size, PROT_READ | PROT_WRITE,
- MAP_SHARED | MAP_FIXED, fd, 0) == MAP_FAILED)
- {
- clib_unix_warning ("mmap");
- close (fd);
- return -3;
- }
- close (fd);
- rp->backing_file = (char *) format (0, "%s\0", a->backing_file);
- rp->flags |= SVM_FLAGS_FILE;
- }
-
- if (a->flags & SVM_FLAGS_MHEAP)
- {
- rp->data_heap =
- mheap_alloc_with_flags ((void *) (rp->data_base), map_size,
- MHEAP_FLAG_DISABLE_VM);
- rp->flags |= SVM_FLAGS_MHEAP;
- }
- return 0;
-}
-
-static int
-svm_data_region_map (svm_map_region_args_t * a, svm_region_t * rp)
-{
- int fd;
- u8 junk = 0;
- uword map_size;
- struct stat statb;
-
- map_size = rp->virtual_size -
- (MMAP_PAGESIZE
- + (a->pvt_heap_size ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE));
-
- if (a->flags & SVM_FLAGS_FILE)
- {
-
- fd = open (a->backing_file, O_RDWR, 0777);
-
- if (fd < 0)
- {
- clib_unix_warning ("open");
- return -1;
- }
-
- if (fstat (fd, &statb) < 0)
- {
- clib_unix_warning ("fstat");
- close (fd);
- return -2;
- }
-
- if (statb.st_mode & S_IFREG)
- {
- if (statb.st_size == 0)
- {
- if (lseek (fd, map_size, SEEK_SET) == (off_t) - 1)
- {
- clib_unix_warning ("seek region size");
- close (fd);
- return -3;
- }
- if (write (fd, &junk, 1) != 1)
- {
- clib_unix_warning ("set region size");
- close (fd);
- return -3;
- }
- }
- else
- {
- map_size = rnd_pagesize (statb.st_size);
- }
- }
- else
- {
- map_size = a->backing_mmap_size;
- }
-
- ASSERT (map_size <= rp->virtual_size
- - (MMAP_PAGESIZE
- +
- (a->pvt_heap_size ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE)));
-
- if (mmap (rp->data_base, map_size, PROT_READ | PROT_WRITE,
- MAP_SHARED | MAP_FIXED, fd, 0) == MAP_FAILED)
- {
- clib_unix_warning ("mmap");
- close (fd);
- return -3;
- }
- close (fd);
- }
- return 0;
-}
-
-u8 *
-shm_name_from_svm_map_region_args (svm_map_region_args_t * a)
-{
- u8 *path;
- u8 *shm_name;
- u8 *split_point;
- u8 *mkdir_arg = 0;
- int root_path_offset = 0;
- int name_offset = 0;
-
- if (a->root_path)
- {
- /* Tolerate present or absent slashes */
- if (a->root_path[0] == '/')
- root_path_offset++;
-
- /* create the root_path under /dev/shm
- iterate through path creating directories */
-
- path = format (0, "/dev/shm/%s%c", &a->root_path[root_path_offset], 0);
- split_point = path + 1;
- vec_add1 (mkdir_arg, '-');
-
- while (*split_point)
- {
- while (*split_point && *split_point != '/')
- {
- vec_add1 (mkdir_arg, *split_point);
- split_point++;
- }
- vec_add1 (mkdir_arg, 0);
-
- /* ready to descend another level */
- mkdir_arg[vec_len (mkdir_arg) - 1] = '-';
- split_point++;
- }
- vec_free (mkdir_arg);
- vec_free (path);
-
- if (a->name[0] == '/')
- name_offset = 1;
-
- shm_name = format (0, "/%s-%s%c", a->root_path,
- &a->name[name_offset], 0);
- }
- else
- shm_name = format (0, "%s%c", a->name, 0);
- return (shm_name);
-}
-
-/*
- * svm_map_region
- */
-void *
-svm_map_region (svm_map_region_args_t * a)
-{
- int svm_fd;
- svm_region_t *rp;
- pthread_mutexattr_t attr;
- pthread_condattr_t cattr;
- int deadman = 0;
- u8 junk = 0;
- void *oldheap;
- int overhead_space;
- int rv;
- uword data_base;
- int nbits, words, bit;
- int pid_holding_region_lock;
- u8 *shm_name;
- int dead_region_recovery = 0;
- int time_left;
- struct stat stat;
- struct timespec ts, tsrem;
-
- if (CLIB_DEBUG > 1)
- clib_warning ("[%d] map region %s", getpid (), a->name);
-
- ASSERT ((a->size & ~(MMAP_PAGESIZE - 1)) == a->size);
- ASSERT (a->name);
-
- shm_name = shm_name_from_svm_map_region_args (a);
-
- svm_fd = shm_open ((char *) shm_name, O_RDWR | O_CREAT | O_EXCL, 0777);
-
- if (svm_fd >= 0)
- {
- if (fchmod (svm_fd, 0770) < 0)
- clib_unix_warning ("segment chmod");
- /* This turns out to fail harmlessly if the client starts first */
- if (fchown (svm_fd, a->uid, a->gid) < 0)
- clib_unix_warning ("segment chown [ok if client starts first]");
-
- vec_free (shm_name);
-
- if (lseek (svm_fd, a->size, SEEK_SET) == (off_t) - 1)
- {
- clib_warning ("seek region size");
- close (svm_fd);
- return (0);
- }
- if (write (svm_fd, &junk, 1) != 1)
- {
- clib_warning ("set region size");
- close (svm_fd);
- return (0);
- }
-
- rp = mmap ((void *) a->baseva, a->size,
- PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, svm_fd, 0);
-
- if (rp == (svm_region_t *) MAP_FAILED)
- {
- clib_unix_warning ("mmap create");
- close (svm_fd);
- return (0);
- }
- close (svm_fd);
- memset (rp, 0, sizeof (*rp));
-
- if (pthread_mutexattr_init (&attr))
- clib_unix_warning ("mutexattr_init");
-
- if (pthread_mutexattr_setpshared (&attr, PTHREAD_PROCESS_SHARED))
- clib_unix_warning ("mutexattr_setpshared");
-
- if (pthread_mutex_init (&rp->mutex, &attr))
- clib_unix_warning ("mutex_init");
-
- if (pthread_mutexattr_destroy (&attr))
- clib_unix_warning ("mutexattr_destroy");
-
- if (pthread_condattr_init (&cattr))
- clib_unix_warning ("condattr_init");
-
- if (pthread_condattr_setpshared (&cattr, PTHREAD_PROCESS_SHARED))
- clib_unix_warning ("condattr_setpshared");
-
- if (pthread_cond_init (&rp->condvar, &cattr))
- clib_unix_warning ("cond_init");
-
- if (pthread_condattr_destroy (&cattr))
- clib_unix_warning ("condattr_destroy");
-
- region_lock (rp, 1);
-
- rp->virtual_base = a->baseva;
- rp->virtual_size = a->size;
-
- rp->region_heap =
- mheap_alloc_with_flags ((void *) (a->baseva + MMAP_PAGESIZE),
- (a->pvt_heap_size != 0) ?
- a->pvt_heap_size : SVM_PVT_MHEAP_SIZE,
- MHEAP_FLAG_DISABLE_VM);
- oldheap = svm_push_pvt_heap (rp);
-
- rp->region_name = (char *) format (0, "%s%c", a->name, 0);
- vec_add1 (rp->client_pids, getpid ());
-
- nbits = rp->virtual_size / MMAP_PAGESIZE;
-
- ASSERT (nbits > 0);
- rp->bitmap_size = nbits;
- words = (nbits + BITS (uword) - 1) / BITS (uword);
- vec_validate (rp->bitmap, words - 1);
-
- overhead_space = MMAP_PAGESIZE /* header */ +
- ((a->pvt_heap_size != 0) ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE);
-
- bit = 0;
- data_base = (uword) rp->virtual_base;
-
- if (a->flags & SVM_FLAGS_NODATA)
- rp->flags |= SVM_FLAGS_NEED_DATA_INIT;
-
- do
- {
- clib_bitmap_set_no_check (rp->bitmap, bit, 1);
- bit++;
- overhead_space -= MMAP_PAGESIZE;
- data_base += MMAP_PAGESIZE;
- }
- while (overhead_space > 0);
-
- rp->data_base = (void *) data_base;
-
- /*
- * Note: although the POSIX spec guarantees that only one
- * process enters this block, we have to play games
- * to hold off clients until e.g. the mutex is ready
- */
- rp->version = SVM_VERSION;
-
- /* setup the data portion of the region */
-
- rv = svm_data_region_create (a, rp);
- if (rv)
- {
- clib_warning ("data_region_create: %d", rv);
- }
-
- region_unlock (rp);
-
- svm_pop_heap (oldheap);
-
- return ((void *) rp);
- }
- else
- {
- svm_fd = shm_open ((char *) shm_name, O_RDWR, 0777);
-
- vec_free (shm_name);
-
- if (svm_fd < 0)
- {
- perror ("svm_region_map(mmap open)");
- return (0);
- }
-
- time_left = 20;
- while (1)
- {
- if (0 != fstat (svm_fd, &stat))
- {
- clib_warning ("fstat failed: %d", errno);
- close (svm_fd);
- return (0);
- }
- if (stat.st_size > 0)
- {
- break;
- }
- if (0 == time_left)
- {
- clib_warning ("waiting for resize of shm file timed out");
- close (svm_fd);
- return (0);
- }
- ts.tv_sec = 0;
- ts.tv_nsec = 100000000;
- while (nanosleep (&ts, &tsrem) < 0)
- ts = tsrem;
- time_left--;
- }
-
- rp = mmap (0, MMAP_PAGESIZE,
- PROT_READ | PROT_WRITE, MAP_SHARED, svm_fd, 0);
-
- if (rp == (svm_region_t *) MAP_FAILED)
- {
- close (svm_fd);
- clib_warning ("mmap");
- return (0);
- }
- /*
- * We lost the footrace to create this region; make sure
- * the winner has crossed the finish line.
- */
- while (rp->version == 0 && deadman++ < 5)
- {
- sleep (1);
- }
-
- /*
- * <bleep>-ed?
- */
- if (rp->version == 0)
- {
- clib_warning ("rp->version %d not %d", rp->version, SVM_VERSION);
- close (svm_fd);
- munmap (rp, a->size);
- return (0);
- }
- /* Remap now that the region has been placed */
- a->baseva = rp->virtual_base;
- a->size = rp->virtual_size;
- munmap (rp, MMAP_PAGESIZE);
-
- rp = (void *) mmap ((void *) a->baseva, a->size,
- PROT_READ | PROT_WRITE,
- MAP_SHARED | MAP_FIXED, svm_fd, 0);
- if ((uword) rp == (uword) MAP_FAILED)
- {
- clib_unix_warning ("mmap");
- close (svm_fd);
- return (0);
- }
-
- if ((uword) rp != rp->virtual_base)
- {
- clib_warning ("mmap botch");
- }
-
- /*
- * Try to fix the region mutex if it is held by
- * a dead process
- */
- pid_holding_region_lock = rp->mutex_owner_pid;
- if (pid_holding_region_lock && kill (pid_holding_region_lock, 0) < 0)
- {
- clib_warning
- ("region %s mutex held by dead pid %d, tag %d, force unlock",
- rp->region_name, pid_holding_region_lock, rp->mutex_owner_tag);
- /* owner pid is nonexistent */
- rp->mutex.__data.__owner = 0;
- rp->mutex.__data.__lock = 0;
- dead_region_recovery = 1;
- }
-
- if (dead_region_recovery)
- clib_warning ("recovery: attempt to re-lock region");
-
- region_lock (rp, 2);
- oldheap = svm_push_pvt_heap (rp);
- vec_add1 (rp->client_pids, getpid ());
-
- if (dead_region_recovery)
- clib_warning ("recovery: attempt svm_data_region_map");
-
- rv = svm_data_region_map (a, rp);
- if (rv)
- {
- clib_warning ("data_region_map: %d", rv);
- }
-
- if (dead_region_recovery)
- clib_warning ("unlock and continue");
-
- region_unlock (rp);
-
- svm_pop_heap (oldheap);
-
- return ((void *) rp);
-
- }
- return 0; /* NOTREACHED */
-}
-
-static void
-svm_mutex_cleanup (void)
-{
- int i;
- for (i = 0; i < nheld; i++)
- {
- pthread_mutex_unlock (mutexes_held[i]);
- }
-}
-
-static void
-svm_region_init_internal (svm_map_region_args_t * a)
-{
- svm_region_t *rp;
- u64 ticks = clib_cpu_time_now ();
- uword randomize_baseva;
-
- /* guard against klutz calls */
- if (root_rp)
- return;
-
- root_rp_refcount++;
-
- atexit (svm_mutex_cleanup);
-
- /* Randomize the shared-VM base at init time */
- if (MMAP_PAGESIZE <= (4 << 10))
- randomize_baseva = (ticks & 15) * MMAP_PAGESIZE;
- else
- randomize_baseva = (ticks & 3) * MMAP_PAGESIZE;
-
- a->baseva += randomize_baseva;
-
- rp = svm_map_region (a);
- ASSERT (rp);
-
- region_lock (rp, 3);
-
- /* Set up the main region data structures */
- if (rp->flags & SVM_FLAGS_NEED_DATA_INIT)
- {
- svm_main_region_t *mp = 0;
- void *oldheap;
-
- rp->flags &= ~(SVM_FLAGS_NEED_DATA_INIT);
-
- oldheap = svm_push_pvt_heap (rp);
- vec_validate (mp, 0);
- mp->name_hash = hash_create_string (0, sizeof (uword));
- mp->root_path = a->root_path ? format (0, "%s%c", a->root_path, 0) : 0;
- rp->data_base = mp;
- svm_pop_heap (oldheap);
- }
- region_unlock (rp);
- root_rp = rp;
-}
-
-void
-svm_region_init (void)
-{
- svm_map_region_args_t _a, *a = &_a;
-
- memset (a, 0, sizeof (*a));
- a->root_path = 0;
- a->name = SVM_GLOBAL_REGION_NAME;
- a->baseva = SVM_GLOBAL_REGION_BASEVA;
- a->size = SVM_GLOBAL_REGION_SIZE;
- a->flags = SVM_FLAGS_NODATA;
- a->uid = 0;
- a->gid = 0;
-
- svm_region_init_internal (a);
-}
-
-void
-svm_region_init_chroot (char *root_path)
-{
- svm_map_region_args_t _a, *a = &_a;
-
- memset (a, 0, sizeof (*a));
- a->root_path = root_path;
- a->name = SVM_GLOBAL_REGION_NAME;
- a->baseva = SVM_GLOBAL_REGION_BASEVA;
- a->size = SVM_GLOBAL_REGION_SIZE;
- a->flags = SVM_FLAGS_NODATA;
- a->uid = 0;
- a->gid = 0;
-
- svm_region_init_internal (a);
-}
-
-void
-svm_region_init_chroot_uid_gid (char *root_path, int uid, int gid)
-{
- svm_map_region_args_t _a, *a = &_a;
-
- memset (a, 0, sizeof (*a));
- a->root_path = root_path;
- a->name = SVM_GLOBAL_REGION_NAME;
- a->baseva = SVM_GLOBAL_REGION_BASEVA;
- a->size = SVM_GLOBAL_REGION_SIZE;
- a->flags = SVM_FLAGS_NODATA;
- a->uid = uid;
- a->gid = gid;
-
- svm_region_init_internal (a);
-}
-
-void
-svm_region_init_args (svm_map_region_args_t * a)
-{
- svm_region_init_internal (a);
-}
-
-void *
-svm_region_find_or_create (svm_map_region_args_t * a)
-{
- svm_main_region_t *mp;
- svm_region_t *rp;
- uword need_nbits;
- int index, i;
- void *oldheap;
- uword *p;
- u8 *name;
- svm_subregion_t *subp;
-
- ASSERT (root_rp);
-
- a->size += MMAP_PAGESIZE +
- ((a->pvt_heap_size != 0) ? a->pvt_heap_size : SVM_PVT_MHEAP_SIZE);
- a->size = rnd_pagesize (a->size);
-
- region_lock (root_rp, 4);
- oldheap = svm_push_pvt_heap (root_rp);
- mp = root_rp->data_base;
-
- ASSERT (mp);
-
- /* Map the named region from the correct chroot environment */
- a->root_path = (char *) mp->root_path;
-
- /*
- * See if this region is already known. If it is, we're
- * almost done...
- */
- p = hash_get_mem (mp->name_hash, a->name);
-
- if (p)
- {
- rp = svm_map_region (a);
- region_unlock (root_rp);
- svm_pop_heap (oldheap);
- return rp;
- }
-
- /* Create the region. */
- ASSERT ((a->size & ~(MMAP_PAGESIZE - 1)) == a->size);
-
- need_nbits = a->size / MMAP_PAGESIZE;
-
- index = 1; /* $$$ fixme, figure out how many bit to really skip */
-
- /*
- * Scan the virtual space allocation bitmap, looking for a large
- * enough chunk
- */
- do
- {
- if (clib_bitmap_get_no_check (root_rp->bitmap, index) == 0)
- {
- for (i = 0; i < (need_nbits - 1); i++)
- {
- if (clib_bitmap_get_no_check (root_rp->bitmap, index + i) == 1)
- {
- index = index + i;
- goto next;
- }
- }
- break;
- }
- index++;
- next:;
- }
- while (index < root_rp->bitmap_size);
-
- /* Completely out of VM? */
- if (index >= root_rp->bitmap_size)
- {
- clib_warning ("region %s: not enough VM to allocate 0x%llx (%lld)",
- root_rp->region_name, a->size, a->size);
- svm_pop_heap (oldheap);
- region_unlock (root_rp);
- return 0;
- }
-
- /*
- * Mark virtual space allocated
- */
-#if CLIB_DEBUG > 1
- clib_warning ("set %d bits at index %d", need_nbits, index);
-#endif
-
- for (i = 0; i < need_nbits; i++)
- {
- clib_bitmap_set_no_check (root_rp->bitmap, index + i, 1);
- }
-
- /* Place this region where it goes... */
- a->baseva = root_rp->virtual_base + index * MMAP_PAGESIZE;
-
- rp = svm_map_region (a);
-
- pool_get (mp->subregions, subp);
- name = format (0, "%s%c", a->name, 0);
- subp->subregion_name = name;
-
- hash_set_mem (mp->name_hash, name, subp - mp->subregions);
-
- svm_pop_heap (oldheap);
-
- region_unlock (root_rp);
-
- return (rp);
-}
-
-/*
- * svm_region_unmap
- *
- * Let go of the indicated region. If the calling process
- * is the last customer, throw it away completely.
- * The root region mutex guarantees atomicity with respect to
- * a new region client showing up at the wrong moment.
- */
-void
-svm_region_unmap (void *rp_arg)
-{
- int i, mypid = getpid ();
- int nclients_left;
- void *oldheap;
- uword virtual_base, virtual_size;
- svm_region_t *rp = rp_arg;
- char *name;
-
- /*
- * If we take a signal while holding one or more shared-memory
- * mutexes, we may end up back here from an otherwise
- * benign exit handler. Bail out to avoid a recursive
- * mutex screw-up.
- */
- if (nheld)
- return;
-
- ASSERT (rp);
- ASSERT (root_rp);
-
- if (CLIB_DEBUG > 1)
- clib_warning ("[%d] unmap region %s", getpid (), rp->region_name);
-
- region_lock (root_rp, 5);
- region_lock (rp, 6);
-
- oldheap = svm_push_pvt_heap (rp); /* nb vec_delete() in the loop */
-
- /* Remove the caller from the list of mappers */
- for (i = 0; i < vec_len (rp->client_pids); i++)
- {
- if (rp->client_pids[i] == mypid)
- {
- vec_delete (rp->client_pids, 1, i);
- goto found;
- }
- }
- clib_warning ("pid %d AWOL", mypid);
-
-found:
-
- svm_pop_heap (oldheap);
-
- nclients_left = vec_len (rp->client_pids);
- virtual_base = rp->virtual_base;
- virtual_size = rp->virtual_size;
-
- if (nclients_left == 0)
- {
- int index, nbits, i;
- svm_main_region_t *mp;
- uword *p;
- svm_subregion_t *subp;
-
- /* Kill the region, last guy on his way out */
-
- oldheap = svm_push_pvt_heap (root_rp);
- name = vec_dup (rp->region_name);
-
- virtual_base = rp->virtual_base;
- virtual_size = rp->virtual_size;
-
- /* Figure out which bits to clear in the root region bitmap */
- index = (virtual_base - root_rp->virtual_base) / MMAP_PAGESIZE;
-
- nbits = (virtual_size + MMAP_PAGESIZE - 1) / MMAP_PAGESIZE;
-
-#if CLIB_DEBUG > 1
- clib_warning ("clear %d bits at index %d", nbits, index);
-#endif
- /* Give back the allocated VM */
- for (i = 0; i < nbits; i++)
- {
- clib_bitmap_set_no_check (root_rp->bitmap, index + i, 0);
- }
-
- mp = root_rp->data_base;
-
- p = hash_get_mem (mp->name_hash, name);
-
- /* Better never happen ... */
- if (p == NULL)
- {
- region_unlock (rp);
- region_unlock (root_rp);
- svm_pop_heap (oldheap);
- clib_warning ("Region name '%s' not found?", name);
- return;
- }
-
- /* Remove from the root region subregion pool */
- subp = mp->subregions + p[0];
- pool_put (mp->subregions, subp);
-
- hash_unset_mem (mp->name_hash, name);
-
- vec_free (name);
-
- region_unlock (rp);
- shm_unlink (rp->region_name);
- munmap ((void *) virtual_base, virtual_size);
- region_unlock (root_rp);
- svm_pop_heap (oldheap);
- return;
- }
-
- region_unlock (rp);
- region_unlock (root_rp);
-
- munmap ((void *) virtual_base, virtual_size);
-}
-
-/*
- * svm_region_exit
- * There is no clean way to unlink the
- * root region when all clients go away,
- * so remove the pid entry and call it a day.
- */
-void
-svm_region_exit ()
-{
- void *oldheap;
- int i, mypid = getpid ();
- uword virtual_base, virtual_size;
-
- /* It felt so nice we did it twice... */
- if (root_rp == 0)
- return;
-
- if (--root_rp_refcount > 0)
- return;
-
- /*
- * If we take a signal while holding one or more shared-memory
- * mutexes, we may end up back here from an otherwise
- * benign exit handler. Bail out to avoid a recursive
- * mutex screw-up.
- */
- if (nheld)
- return;
-
- region_lock (root_rp, 7);
- oldheap = svm_push_pvt_heap (root_rp);
-
- virtual_base = root_rp->virtual_base;
- virtual_size = root_rp->virtual_size;
-
- for (i = 0; i < vec_len (root_rp->client_pids); i++)
- {
- if (root_rp->client_pids[i] == mypid)
- {
- vec_delete (root_rp->client_pids, 1, i);
- goto found;
- }
- }
- clib_warning ("pid %d AWOL", mypid);
-
-found:
-
- region_unlock (root_rp);
- svm_pop_heap (oldheap);
-
- root_rp = 0;
- munmap ((void *) virtual_base, virtual_size);
-}
-
-void
-svm_client_scan_this_region_nolock (svm_region_t * rp)
-{
- int j;
- int mypid = getpid ();
- void *oldheap;
-
- for (j = 0; j < vec_len (rp->client_pids); j++)
- {
- if (mypid == rp->client_pids[j])
- continue;
- if (rp->client_pids[j] && (kill (rp->client_pids[j], 0) < 0))
- {
- clib_warning ("%s: cleanup ghost pid %d",
- rp->region_name, rp->client_pids[j]);
- /* nb: client vec in rp->region_heap */
- oldheap = svm_push_pvt_heap (rp);
- vec_delete (rp->client_pids, 1, j);
- j--;
- svm_pop_heap (oldheap);
- }
- }
-}
-
-
-/*
- * Scan svm regions for dead clients
- */
-void
-svm_client_scan (char *root_path)
-{
- int i, j;
- svm_main_region_t *mp;
- svm_map_region_args_t *a = 0;
- svm_region_t *root_rp;
- svm_region_t *rp;
- svm_subregion_t *subp;
- u8 *name = 0;
- u8 **svm_names = 0;
- void *oldheap;
- int mypid = getpid ();
-
- vec_validate (a, 0);
-
- svm_region_init_chroot (root_path);
-
- root_rp = svm_get_root_rp ();
-
- pthread_mutex_lock (&root_rp->mutex);
-
- mp = root_rp->data_base;
-
- for (j = 0; j < vec_len (root_rp->client_pids); j++)
- {
- if (mypid == root_rp->client_pids[j])
- continue;
- if (root_rp->client_pids[j] && (kill (root_rp->client_pids[j], 0) < 0))
- {
- clib_warning ("%s: cleanup ghost pid %d",
- root_rp->region_name, root_rp->client_pids[j]);
- /* nb: client vec in root_rp->region_heap */
- oldheap = svm_push_pvt_heap (root_rp);
- vec_delete (root_rp->client_pids, 1, j);
- j--;
- svm_pop_heap (oldheap);
- }
- }
-
- /*
- * Snapshoot names, can't hold root rp mutex across
- * find_or_create.
- */
- /* *INDENT-OFF* */
- pool_foreach (subp, mp->subregions, ({
- name = vec_dup (subp->subregion_name);
- vec_add1(svm_names, name);
- }));
- /* *INDENT-ON* */
-
- pthread_mutex_unlock (&root_rp->mutex);
-
- for (i = 0; i < vec_len (svm_names); i++)
- {
- vec_validate (a, 0);
- a->root_path = root_path;
- a->name = (char *) svm_names[i];
- rp = svm_region_find_or_create (a);
- if (rp)
- {
- pthread_mutex_lock (&rp->mutex);
-
- svm_client_scan_this_region_nolock (rp);
-
- pthread_mutex_unlock (&rp->mutex);
- svm_region_unmap (rp);
- vec_free (svm_names[i]);
- }
- vec_free (a);
- }
- vec_free (svm_names);
-
- svm_region_exit ();
-
- vec_free (a);
-}
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */