diff options
Diffstat (limited to 'svm/svmtool.c')
| -rw-r--r-- | svm/svmtool.c | 464 |
1 files changed, 464 insertions, 0 deletions
diff --git a/svm/svmtool.c b/svm/svmtool.c new file mode 100644 index 00000000000..e87746110ae --- /dev/null +++ b/svm/svmtool.c @@ -0,0 +1,464 @@ +/* + *------------------------------------------------------------------ + * svmtool.c + * + * 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" + + + +/* + * format_all_svm_regions + * Maps / unmaps regions. Do NOT call from client code! + */ +u8 *format_all_svm_regions (u8 *s, va_list * args) +{ + int verbose = va_arg (*args, int); + svm_region_t *root_rp = svm_get_root_rp(); + svm_main_region_t *mp; + svm_subregion_t *subp; + svm_region_t *rp; + svm_map_region_args_t *a = 0; + u8 ** svm_names=0; + u8 *name=0; + int i; + + ASSERT(root_rp); + + pthread_mutex_lock (&root_rp->mutex); + + s = format (s, "%U", format_svm_region, root_rp, verbose); + + mp = root_rp->data_base; + + /* + * Snapshoot names, can't hold root rp mutex across + * find_or_create. + */ + pool_foreach (subp, mp->subregions, ({ + name = vec_dup (subp->subregion_name); + vec_add1(svm_names, name); + })); + + pthread_mutex_unlock (&root_rp->mutex); + + for (i = 0; i < vec_len(svm_names); i++) { + vec_validate(a, 0); + a->name = (char *) svm_names[i]; + rp = svm_region_find_or_create (a); + if (rp) { + pthread_mutex_lock (&rp->mutex); + s = format (s, "%U", format_svm_region, rp, verbose); + pthread_mutex_unlock (&rp->mutex); + svm_region_unmap (rp); + vec_free(svm_names[i]); + } + vec_free (a); + } + vec_free(svm_names); + return (s); +} + +void show (char *chroot_path, int verbose) +{ + svm_map_region_args_t *a = 0; + + vec_validate (a, 0); + + svm_region_init_chroot(chroot_path); + + fformat(stdout, "My pid is %d\n", getpid()); + + fformat(stdout, "%U", format_all_svm_regions, verbose); + + svm_region_exit (); + + vec_free (a); +} + + +static void *svm_map_region_nolock (svm_map_region_args_t *a) +{ + int svm_fd; + svm_region_t *rp; + int deadman=0; + u8 *shm_name; + + ASSERT((a->size & ~(MMAP_PAGESIZE-1)) == a->size); + + shm_name = shm_name_from_svm_map_region_args (a); + + svm_fd = shm_open((char *)shm_name, O_RDWR, 0777); + + if (svm_fd < 0) { + perror("svm_region_map(mmap open)"); + return (0); + } + vec_free (shm_name); + + 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); + 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"); + return (0); + } + + if ((uword) rp != rp->virtual_base) { + clib_warning("mmap botch"); + } + + if (pthread_mutex_trylock(&rp->mutex)) { + clib_warning ("rp->mutex LOCKED by pid %d, tag %d, cleared...", + rp->mutex_owner_pid, rp->mutex_owner_tag); + memset(&rp->mutex, 0, sizeof (rp->mutex)); + + } else { + clib_warning ("mutex OK...\n"); + pthread_mutex_unlock(&rp->mutex); + } + + return ((void *) rp); +} + +/* + * rnd_pagesize + * Round to a pagesize multiple, presumably 4k works + */ +static unsigned int rnd_pagesize(unsigned int size) +{ + unsigned int rv; + + rv = (size + (MMAP_PAGESIZE-1)) & ~(MMAP_PAGESIZE-1); + return(rv); +} + +#define MUTEX_DEBUG + +always_inline 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 +} + +always_inline void region_unlock(svm_region_t *rp) +{ +#ifdef MUTEX_DEBUG + rp->mutex_owner_pid = 0; + rp->mutex_owner_tag = 0; +#endif + pthread_mutex_unlock(&rp->mutex); +} + + +static void *svm_existing_region_map_nolock (void *root_arg, + svm_map_region_args_t *a) +{ + svm_region_t *root_rp = root_arg; + svm_main_region_t *mp; + svm_region_t *rp; + void *oldheap; + uword *p; + + a->size += MMAP_PAGESIZE + 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); + + p = hash_get_mem (mp->name_hash, a->name); + + if (p) { + rp = svm_map_region_nolock (a); + region_unlock(root_rp); + svm_pop_heap (oldheap); + return rp; + } + return 0; + +} + +static void trace (char *chroot_path, char *name, int enable_disable) +{ + svm_map_region_args_t *a = 0; + svm_region_t *db_rp; + void *oldheap; + + vec_validate (a, 0); + + svm_region_init_chroot(chroot_path); + + a->name = name; + a->size = 1<<20; + a->flags = SVM_FLAGS_MHEAP; + + db_rp = svm_region_find_or_create (a); + + ASSERT(db_rp); + + region_lock (db_rp, 20); + + oldheap = svm_push_data_heap (db_rp); + + mheap_trace (db_rp->data_heap, enable_disable); + + svm_pop_heap (oldheap); + region_unlock (db_rp); + + svm_region_unmap ((void *)db_rp); + svm_region_exit (); + vec_free (a); +} + + + +static void subregion_repair(char *chroot_path) +{ + int i; + svm_main_region_t *mp; + svm_map_region_args_t a; + svm_region_t *root_rp; + svm_region_t *rp; + svm_subregion_t *subp; + u8 *name=0; + u8 ** svm_names=0; + + svm_region_init_chroot(chroot_path); + root_rp = svm_get_root_rp(); + + pthread_mutex_lock (&root_rp->mutex); + + mp = root_rp->data_base; + + /* + * Snapshoot names, can't hold root rp mutex across + * find_or_create. + */ + pool_foreach (subp, mp->subregions, ({ + name = vec_dup (subp->subregion_name); + vec_add1(svm_names, name); + })); + + pthread_mutex_unlock (&root_rp->mutex); + + for (i = 0; i < vec_len(svm_names); i++) { + memset (&a, 0, sizeof (a)); + a.root_path = chroot_path; + a.name = (char *) svm_names[i]; + fformat(stdout, "Checking %s region...\n", + a.name); + rp = svm_existing_region_map_nolock (root_rp, &a); + if (rp) { + svm_region_unmap (rp); + vec_free(svm_names[i]); + } + } + vec_free(svm_names); +} + +void repair (char *chroot_path, int crash_root_region) +{ + svm_region_t *root_rp = 0; + svm_map_region_args_t *a = 0; + void *svm_map_region (svm_map_region_args_t *a); + int svm_fd; + u8 *shm_name; + + fformat(stdout, "our pid: %d\n", getpid()); + + vec_validate (a, 0); + + a->root_path = chroot_path; + a->name = SVM_GLOBAL_REGION_NAME; + a->baseva = SVM_GLOBAL_REGION_BASEVA; + a->size = SVM_GLOBAL_REGION_SIZE; + a->flags = SVM_FLAGS_NODATA; + + shm_name = shm_name_from_svm_map_region_args (a); + + svm_fd = shm_open ((char *)shm_name, O_RDWR, 0777); + + if (svm_fd < 0) { + perror("svm_region_map(mmap open)"); + goto out; + } + + vec_free(shm_name); + + root_rp = mmap(0, MMAP_PAGESIZE, + PROT_READ | PROT_WRITE, MAP_SHARED, svm_fd, 0); + + if (root_rp == (svm_region_t *) MAP_FAILED) { + close(svm_fd); + clib_warning("mmap"); + goto out; + } + + /* Remap now that the region has been placed */ + clib_warning ("remap to 0x%x", root_rp->virtual_base); + + a->baseva = root_rp->virtual_base; + a->size = root_rp->virtual_size; + munmap(root_rp, MMAP_PAGESIZE); + + root_rp = (void *) mmap ((void *)a->baseva, a->size, + PROT_READ | PROT_WRITE, + MAP_SHARED | MAP_FIXED, svm_fd, 0); + if ((uword)root_rp == (uword)MAP_FAILED) { + clib_unix_warning ("mmap"); + goto out; + } + + close(svm_fd); + + if ((uword) root_rp != root_rp->virtual_base) { + clib_warning("mmap botch"); + goto out; + } + + if (pthread_mutex_trylock(&root_rp->mutex)) { + clib_warning ("root_rp->mutex LOCKED by pid %d, tag %d, cleared...", + root_rp->mutex_owner_pid, root_rp->mutex_owner_tag); + memset(&root_rp->mutex, 0, sizeof (root_rp->mutex)); + goto out; + } else { + clib_warning ("root_rp->mutex OK...\n"); + pthread_mutex_unlock(&root_rp->mutex); + } + + out: + vec_free (a); + /* + * Now that the root region is known to be OK, + * fix broken subregions + */ + subregion_repair(chroot_path); + + if (crash_root_region) { + clib_warning ("Leaving root region locked on purpose..."); + pthread_mutex_lock(&root_rp->mutex); + root_rp->mutex_owner_pid = getpid(); + root_rp->mutex_owner_tag = 99; + } + svm_region_exit (); +} + +int main (int argc, char **argv) +{ + unformat_input_t input; + int parsed =0; + char *name; + char *chroot_path = 0; + u8 *chroot_u8; + + unformat_init_command_line (&input, argv); + + while (unformat_check_input (&input) != UNFORMAT_END_OF_INPUT) { + if (unformat(&input, "show-verbose")) { + show (chroot_path, 1); + parsed++; + } else if (unformat (&input, "show")) { + show (chroot_path, 0); + parsed++; + } else if (unformat (&input, "client-scan")) { + svm_client_scan(chroot_path); + parsed++; + } else if (unformat (&input, "repair")) { + repair(chroot_path, 0 /* fix it */); + parsed++; + } else if (unformat (&input, "crash")) { + repair (chroot_path, 1 /* crash it */); + parsed++; + } else if (unformat (&input, "trace-on %s", &name)) { + trace (chroot_path, name, 1); + parsed++; + } else if (unformat (&input, "trace-off %s", &name)) { + trace (chroot_path, name, 0); + parsed++; + } else if (unformat (&input, "chroot %s", &chroot_u8)) { + chroot_path = (char *) chroot_u8; + } else { + break; + } + } + + unformat_free (&input); + + if (!parsed) { + fformat(stdout, "%s: show | show-verbose | client-scan | trace-on <region-name>\n", argv[0]); + fformat(stdout, " trace-off <region-name>\n"); + } + exit (0); +} |