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/*
*------------------------------------------------------------------
* svm.h - shared VM allocation, mmap(...MAP_FIXED...)
* brain police
*
* 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.
*------------------------------------------------------------------
*/
#ifndef __included_svm_h__
#define __included_svm_h__
#include <pthread.h>
#include <vppinfra/clib.h>
#include <vppinfra/mem.h>
#define MMAP_PAGESIZE (clib_mem_get_page_size())
#define SVM_VERSION ((1<<16) | 1) /* set to declare region ready. */
#define SVM_FLAGS_MHEAP (1<<0) /* region contains an mheap */
#define SVM_FLAGS_FILE (1<<1) /* region backed by one or more files */
#define SVM_FLAGS_NODATA (1<<2) /* region will be further subdivided */
#define SVM_FLAGS_NEED_DATA_INIT (1<<3)
#define SVM_PVT_MHEAP_SIZE (128<<10) /* region's private mheap (128k) */
typedef struct svm_region_
{
volatile uword version;
pthread_mutex_t mutex;
pthread_cond_t condvar;
int mutex_owner_pid; /* in case of trouble */
int mutex_owner_tag;
uword flags;
uword virtual_base; /* base of the region object */
uword virtual_size;
void *region_heap;
void *data_base; /* data portion base address */
void *data_heap; /* data heap, if any */
volatile void *user_ctx; /* user context pointer */
/* stuff allocated in the region's heap */
uword bitmap_size; /* nbits in virtual alloc bitmap */
uword *bitmap; /* the bitmap */
char *region_name;
char *backing_file;
char **filenames;
uword *client_pids;
/* pad */
/* next page:
* (64K) clib heap for the region itself
*
* data_base -> whatever is in this region
*/
} svm_region_t;
typedef struct svm_map_region_args_
{
char *root_path; /* NULL means use the truly global arena */
char *name;
u64 baseva;
u64 size;
u64 pvt_heap_size;
uword flags;
char *backing_file;
uword backing_mmap_size;
/* uid, gid to own the svm region(s) */
int uid;
int gid;
} svm_map_region_args_t;
/*
* Memory shared across all router instances. Packet buffers, etc
* Base should be "out of the way," and size should be big enough to
* cover everything we plan to put here.
*/
#define SVM_GLOBAL_REGION_BASEVA 0x30000000
#define SVM_GLOBAL_REGION_SIZE (64<<20)
#define SVM_GLOBAL_REGION_NAME "/global_vm"
/*
* Memory shared across individual router instances.
*/
#define SVM_OVERLAY_REGION_BASEVA \
(SVM_GLOBAL_REGION_BASEVA + SVM_GLOBAL_REGION_SIZE)
#define SVM_OVERLAY_REGION_SIZE (1<<20)
#define SVM_OVERLAY_REGION_BASENAME "/overlay_vm"
typedef struct
{
u8 *subregion_name;
} svm_subregion_t;
typedef struct
{
svm_subregion_t *subregions; /* subregion pool */
uword *name_hash;
u8 *root_path;
} svm_main_region_t;
void *svm_region_find_or_create (svm_map_region_args_t * a);
void svm_region_init (void);
void svm_region_init_chroot (char *root_path);
void svm_region_init_chroot_uid_gid (char *root_path, int uid, int gid);
void svm_region_init_args (svm_map_region_args_t * a);
void svm_region_exit (void);
void svm_region_unmap (void *rp_arg);
void svm_client_scan (char *root_path);
void svm_client_scan_this_region_nolock (svm_region_t * rp);
u8 *shm_name_from_svm_map_region_args (svm_map_region_args_t * a);
static inline void *
svm_mem_alloc (svm_region_t * rp, uword size)
{
u8 *oldheap;
ASSERT (rp->flags & SVM_FLAGS_MHEAP);
u8 *rv;
pthread_mutex_lock (&rp->mutex);
oldheap = clib_mem_set_heap (rp->data_heap);
rv = clib_mem_alloc (size);
clib_mem_set_heap (oldheap);
pthread_mutex_unlock (&rp->mutex);
return (rv);
}
static inline void *
svm_mem_alloc_aligned_at_offset (svm_region_t * rp,
uword size, uword align, uword offset)
{
u8 *oldheap;
ASSERT (rp->flags & SVM_FLAGS_MHEAP);
u8 *rv;
pthread_mutex_lock (&rp->mutex);
oldheap = clib_mem_set_heap (rp->data_heap);
rv = clib_mem_alloc_aligned_at_offset (size, align, offset,
1 /* yes, call os_out_of_memory */ );
clib_mem_set_heap (oldheap);
pthread_mutex_unlock (&rp->mutex);
return (rv);
}
static inline void
svm_mem_free (svm_region_t * rp, void *ptr)
{
u8 *oldheap;
ASSERT (rp->flags & SVM_FLAGS_MHEAP);
pthread_mutex_lock (&rp->mutex);
oldheap = clib_mem_set_heap (rp->data_heap);
clib_mem_free (ptr);
clib_mem_set_heap (oldheap);
pthread_mutex_unlock (&rp->mutex);
}
static inline void *
svm_push_pvt_heap (svm_region_t * rp)
{
u8 *oldheap;
oldheap = clib_mem_set_heap (rp->region_heap);
return ((void *) oldheap);
}
static inline void *
svm_push_data_heap (svm_region_t * rp)
{
u8 *oldheap;
oldheap = clib_mem_set_heap (rp->data_heap);
return ((void *) oldheap);
}
static inline void
svm_pop_heap (void *oldheap)
{
clib_mem_set_heap (oldheap);
}
u8 *format_svm_region (u8 * s, va_list * args);
svm_region_t *svm_get_root_rp (void);
#endif /* __included_svm_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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