ceph/src/spdk/dpdk/lib/librte_eal/include/rte_malloc.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2019 Intel Corporation
   3  */
   4
   5 #ifndef _RTE_MALLOC_H_
   6 #define _RTE_MALLOC_H_
   7
   8 /**
   9  * @file
  10  * RTE Malloc. This library provides methods for dynamically allocating memory
  11  * from hugepages.
  12  */
  13
  14 #include <stdio.h>
  15 #include <stddef.h>
  16 #include <rte_compat.h>
  17 #include <rte_memory.h>
  18
  19 #ifdef __cplusplus
  20 extern "C" {
  21 #endif
  22
  23 /**
  24  *  Structure to hold heap statistics obtained from rte_malloc_get_socket_stats function.
  25  */
  26 struct rte_malloc_socket_stats {
  27         size_t heap_totalsz_bytes; /**< Total bytes on heap */
  28         size_t heap_freesz_bytes;  /**< Total free bytes on heap */
  29         size_t greatest_free_size; /**< Size in bytes of largest free block */
  30         unsigned free_count;       /**< Number of free elements on heap */
  31         unsigned alloc_count;      /**< Number of allocated elements on heap */
  32         size_t heap_allocsz_bytes; /**< Total allocated bytes on heap */
  33 };
  34
  35 /**
  36  * This function allocates memory from the huge-page area of memory. The memory
  37  * is not cleared. In NUMA systems, the memory allocated resides on the same
  38  * NUMA socket as the core that calls this function.
  39  *
  40  * @param type
  41  *   A string identifying the type of allocated objects (useful for debug
  42  *   purposes, such as identifying the cause of a memory leak). Can be NULL.
  43  * @param size
  44  *   Size (in bytes) to be allocated.
  45  * @param align
  46  *   If 0, the return is a pointer that is suitably aligned for any kind of
  47  *   variable (in the same manner as malloc()).
  48  *   Otherwise, the return is a pointer that is a multiple of *align*. In
  49  *   this case, it must be a power of two. (Minimum alignment is the
  50  *   cacheline size, i.e. 64-bytes)
  51  * @return
  52  *   - NULL on error. Not enough memory, or invalid arguments (size is 0,
  53  *     align is not a power of two).
  54  *   - Otherwise, the pointer to the allocated object.
  55  */
  56 void *
  57 rte_malloc(const char *type, size_t size, unsigned align);
  58
  59 /**
  60  * Allocate zero'ed memory from the heap.
  61  *
  62  * Equivalent to rte_malloc() except that the memory zone is
  63  * initialised with zeros. In NUMA systems, the memory allocated resides on the
  64  * same NUMA socket as the core that calls this function.
  65  *
  66  * @param type
  67  *   A string identifying the type of allocated objects (useful for debug
  68  *   purposes, such as identifying the cause of a memory leak). Can be NULL.
  69  * @param size
  70  *   Size (in bytes) to be allocated.
  71  * @param align
  72  *   If 0, the return is a pointer that is suitably aligned for any kind of
  73  *   variable (in the same manner as malloc()).
  74  *   Otherwise, the return is a pointer that is a multiple of *align*. In
  75  *   this case, it must obviously be a power of two. (Minimum alignment is the
  76  *   cacheline size, i.e. 64-bytes)
  77  * @return
  78  *   - NULL on error. Not enough memory, or invalid arguments (size is 0,
  79  *     align is not a power of two).
  80  *   - Otherwise, the pointer to the allocated object.
  81  */
  82 void *
  83 rte_zmalloc(const char *type, size_t size, unsigned align);
  84
  85 /**
  86  * Replacement function for calloc(), using huge-page memory. Memory area is
  87  * initialised with zeros. In NUMA systems, the memory allocated resides on the
  88  * same NUMA socket as the core that calls this function.
  89  *
  90  * @param type
  91  *   A string identifying the type of allocated objects (useful for debug
  92  *   purposes, such as identifying the cause of a memory leak). Can be NULL.
  93  * @param num
  94  *   Number of elements to be allocated.
  95  * @param size
  96  *   Size (in bytes) of a single element.
  97  * @param align
  98  *   If 0, the return is a pointer that is suitably aligned for any kind of
  99  *   variable (in the same manner as malloc()).
 100  *   Otherwise, the return is a pointer that is a multiple of *align*. In
 101  *   this case, it must obviously be a power of two. (Minimum alignment is the
 102  *   cacheline size, i.e. 64-bytes)
 103  * @return
 104  *   - NULL on error. Not enough memory, or invalid arguments (size is 0,
 105  *     align is not a power of two).
 106  *   - Otherwise, the pointer to the allocated object.
 107  */
 108 void *
 109 rte_calloc(const char *type, size_t num, size_t size, unsigned align);
 110
 111 /**
 112  * Replacement function for realloc(), using huge-page memory. Reserved area
 113  * memory is resized, preserving contents. In NUMA systems, the new area
 114  * may not reside on the same NUMA node as the old one.
 115  *
 116  * @param ptr
 117  *   Pointer to already allocated memory
 118  * @param size
 119  *   Size (in bytes) of new area. If this is 0, memory is freed.
 120  * @param align
 121  *   If 0, the return is a pointer that is suitably aligned for any kind of
 122  *   variable (in the same manner as malloc()).
 123  *   Otherwise, the return is a pointer that is a multiple of *align*. In
 124  *   this case, it must obviously be a power of two. (Minimum alignment is the
 125  *   cacheline size, i.e. 64-bytes)
 126  * @return
 127  *   - NULL on error. Not enough memory, or invalid arguments (size is 0,
 128  *     align is not a power of two).
 129  *   - Otherwise, the pointer to the reallocated memory.
 130  */
 131 void *
 132 rte_realloc(void *ptr, size_t size, unsigned int align);
 133
 134 /**
 135  * Replacement function for realloc(), using huge-page memory. Reserved area
 136  * memory is resized, preserving contents. In NUMA systems, the new area
 137  * resides on requested NUMA socket.
 138  *
 139  * @param ptr
 140  *   Pointer to already allocated memory
 141  * @param size
 142  *   Size (in bytes) of new area. If this is 0, memory is freed.
 143  * @param align
 144  *   If 0, the return is a pointer that is suitably aligned for any kind of
 145  *   variable (in the same manner as malloc()).
 146  *   Otherwise, the return is a pointer that is a multiple of *align*. In
 147  *   this case, it must obviously be a power of two. (Minimum alignment is the
 148  *   cacheline size, i.e. 64-bytes)
 149  * @param socket
 150  *   NUMA socket to allocate memory on.
 151  * @return
 152  *   - NULL on error. Not enough memory, or invalid arguments (size is 0,
 153  *     align is not a power of two).
 154  *   - Otherwise, the pointer to the reallocated memory.
 155  */
 156 __rte_experimental
 157 void *
 158 rte_realloc_socket(void *ptr, size_t size, unsigned int align, int socket);
 159
 160 /**
 161  * This function allocates memory from the huge-page area of memory. The memory
 162  * is not cleared.
 163  *
 164  * @param type
 165  *   A string identifying the type of allocated objects (useful for debug
 166  *   purposes, such as identifying the cause of a memory leak). Can be NULL.
 167  * @param size
 168  *   Size (in bytes) to be allocated.
 169  * @param align
 170  *   If 0, the return is a pointer that is suitably aligned for any kind of
 171  *   variable (in the same manner as malloc()).
 172  *   Otherwise, the return is a pointer that is a multiple of *align*. In
 173  *   this case, it must be a power of two. (Minimum alignment is the
 174  *   cacheline size, i.e. 64-bytes)
 175  * @param socket
 176  *   NUMA socket to allocate memory on. If SOCKET_ID_ANY is used, this function
 177  *   will behave the same as rte_malloc().
 178  * @return
 179  *   - NULL on error. Not enough memory, or invalid arguments (size is 0,
 180  *     align is not a power of two).
 181  *   - Otherwise, the pointer to the allocated object.
 182  */
 183 void *
 184 rte_malloc_socket(const char *type, size_t size, unsigned align, int socket);
 185
 186 /**
 187  * Allocate zero'ed memory from the heap.
 188  *
 189  * Equivalent to rte_malloc() except that the memory zone is
 190  * initialised with zeros.
 191  *
 192  * @param type
 193  *   A string identifying the type of allocated objects (useful for debug
 194  *   purposes, such as identifying the cause of a memory leak). Can be NULL.
 195  * @param size
 196  *   Size (in bytes) to be allocated.
 197  * @param align
 198  *   If 0, the return is a pointer that is suitably aligned for any kind of
 199  *   variable (in the same manner as malloc()).
 200  *   Otherwise, the return is a pointer that is a multiple of *align*. In
 201  *   this case, it must obviously be a power of two. (Minimum alignment is the
 202  *   cacheline size, i.e. 64-bytes)
 203  * @param socket
 204  *   NUMA socket to allocate memory on. If SOCKET_ID_ANY is used, this function
 205  *   will behave the same as rte_zmalloc().
 206  * @return
 207  *   - NULL on error. Not enough memory, or invalid arguments (size is 0,
 208  *     align is not a power of two).
 209  *   - Otherwise, the pointer to the allocated object.
 210  */
 211 void *
 212 rte_zmalloc_socket(const char *type, size_t size, unsigned align, int socket);
 213
 214 /**
 215  * Replacement function for calloc(), using huge-page memory. Memory area is
 216  * initialised with zeros.
 217  *
 218  * @param type
 219  *   A string identifying the type of allocated objects (useful for debug
 220  *   purposes, such as identifying the cause of a memory leak). Can be NULL.
 221  * @param num
 222  *   Number of elements to be allocated.
 223  * @param size
 224  *   Size (in bytes) of a single element.
 225  * @param align
 226  *   If 0, the return is a pointer that is suitably aligned for any kind of
 227  *   variable (in the same manner as malloc()).
 228  *   Otherwise, the return is a pointer that is a multiple of *align*. In
 229  *   this case, it must obviously be a power of two. (Minimum alignment is the
 230  *   cacheline size, i.e. 64-bytes)
 231  * @param socket
 232  *   NUMA socket to allocate memory on. If SOCKET_ID_ANY is used, this function
 233  *   will behave the same as rte_calloc().
 234  * @return
 235  *   - NULL on error. Not enough memory, or invalid arguments (size is 0,
 236  *     align is not a power of two).
 237  *   - Otherwise, the pointer to the allocated object.
 238  */
 239 void *
 240 rte_calloc_socket(const char *type, size_t num, size_t size, unsigned align, int socket);
 241
 242 /**
 243  * Frees the memory space pointed to by the provided pointer.
 244  *
 245  * This pointer must have been returned by a previous call to
 246  * rte_malloc(), rte_zmalloc(), rte_calloc() or rte_realloc(). The behaviour of
 247  * rte_free() is undefined if the pointer does not match this requirement.
 248  *
 249  * If the pointer is NULL, the function does nothing.
 250  *
 251  * @param ptr
 252  *   The pointer to memory to be freed.
 253  */
 254 void
 255 rte_free(void *ptr);
 256
 257 /**
 258  * If malloc debug is enabled, check a memory block for header
 259  * and trailer markers to indicate that all is well with the block.
 260  * If size is non-null, also return the size of the block.
 261  *
 262  * @param ptr
 263  *   pointer to the start of a data block, must have been returned
 264  *   by a previous call to rte_malloc(), rte_zmalloc(), rte_calloc()
 265  *   or rte_realloc()
 266  * @param size
 267  *   if non-null, and memory block pointer is valid, returns the size
 268  *   of the memory block
 269  * @return
 270  *   -1 on error, invalid pointer passed or header and trailer markers
 271  *   are missing or corrupted
 272  *   0 on success
 273  */
 274 int
 275 rte_malloc_validate(const void *ptr, size_t *size);
 276
 277 /**
 278  * Get heap statistics for the specified heap.
 279  *
 280  * @note This function is not thread-safe with respect to
 281  *    ``rte_malloc_heap_create()``/``rte_malloc_heap_destroy()`` functions.
 282  *
 283  * @param socket
 284  *   An unsigned integer specifying the socket to get heap statistics for
 285  * @param socket_stats
 286  *   A structure which provides memory to store statistics
 287  * @return
 288  *   Null on error
 289  *   Pointer to structure storing statistics on success
 290  */
 291 int
 292 rte_malloc_get_socket_stats(int socket,
 293                 struct rte_malloc_socket_stats *socket_stats);
 294
 295 /**
 296  * Add memory chunk to a heap with specified name.
 297  *
 298  * @note Multiple memory chunks can be added to the same heap
 299  *
 300  * @note Before accessing this memory in other processes, it needs to be
 301  *   attached in each of those processes by calling
 302  *   ``rte_malloc_heap_memory_attach`` in each other process.
 303  *
 304  * @note Memory must be previously allocated for DPDK to be able to use it as a
 305  *   malloc heap. Failing to do so will result in undefined behavior, up to and
 306  *   including segmentation faults.
 307  *
 308  * @note Calling this function will erase any contents already present at the
 309  *   supplied memory address.
 310  *
 311  * @param heap_name
 312  *   Name of the heap to add memory chunk to
 313  * @param va_addr
 314  *   Start of virtual area to add to the heap. Must be aligned by ``page_sz``.
 315  * @param len
 316  *   Length of virtual area to add to the heap. Must be aligned by ``page_sz``.
 317  * @param iova_addrs
 318  *   Array of page IOVA addresses corresponding to each page in this memory
 319  *   area. Can be NULL, in which case page IOVA addresses will be set to
 320  *   RTE_BAD_IOVA.
 321  * @param n_pages
 322  *   Number of elements in the iova_addrs array. Ignored if  ``iova_addrs``
 323  *   is NULL.
 324  * @param page_sz
 325  *   Page size of the underlying memory
 326  *
 327  * @return
 328  *   - 0 on success
 329  *   - -1 in case of error, with rte_errno set to one of the following:
 330  *     EINVAL - one of the parameters was invalid
 331  *     EPERM  - attempted to add memory to a reserved heap
 332  *     ENOSPC - no more space in internal config to store a new memory chunk
 333  */
 334 __rte_experimental
 335 int
 336 rte_malloc_heap_memory_add(const char *heap_name, void *va_addr, size_t len,
 337                 rte_iova_t iova_addrs[], unsigned int n_pages, size_t page_sz);
 338
 339 /**
 340  * Remove memory chunk from heap with specified name.
 341  *
 342  * @note Memory chunk being removed must be the same as one that was added;
 343  *   partially removing memory chunks is not supported
 344  *
 345  * @note Memory area must not contain any allocated elements to allow its
 346  *   removal from the heap
 347  *
 348  * @note All other processes must detach from the memory chunk prior to it being
 349  *   removed from the heap.
 350  *
 351  * @param heap_name
 352  *   Name of the heap to remove memory from
 353  * @param va_addr
 354  *   Virtual address to remove from the heap
 355  * @param len
 356  *   Length of virtual area to remove from the heap
 357  *
 358  * @return
 359  *   - 0 on success
 360  *   - -1 in case of error, with rte_errno set to one of the following:
 361  *     EINVAL - one of the parameters was invalid
 362  *     EPERM  - attempted to remove memory from a reserved heap
 363  *     ENOENT - heap or memory chunk was not found
 364  *     EBUSY  - memory chunk still contains data
 365  */
 366 __rte_experimental
 367 int
 368 rte_malloc_heap_memory_remove(const char *heap_name, void *va_addr, size_t len);
 369
 370 /**
 371  * Attach to an already existing chunk of external memory in another process.
 372  *
 373  * @note This function must be called before any attempt is made to use an
 374  *   already existing external memory chunk. This function does *not* need to
 375  *   be called if a call to ``rte_malloc_heap_memory_add`` was made in the
 376  *   current process.
 377  *
 378  * @param heap_name
 379  *   Heap name to which this chunk of memory belongs
 380  * @param va_addr
 381  *   Start address of memory chunk to attach to
 382  * @param len
 383  *   Length of memory chunk to attach to
 384  * @return
 385  *   0 on successful attach
 386  *   -1 on unsuccessful attach, with rte_errno set to indicate cause for error:
 387  *     EINVAL - one of the parameters was invalid
 388  *     EPERM  - attempted to attach memory to a reserved heap
 389  *     ENOENT - heap or memory chunk was not found
 390  */
 391 __rte_experimental
 392 int
 393 rte_malloc_heap_memory_attach(const char *heap_name, void *va_addr, size_t len);
 394
 395 /**
 396  * Detach from a chunk of external memory in secondary process.
 397  *
 398  * @note This function must be called in before any attempt is made to remove
 399  *   external memory from the heap in another process. This function does *not*
 400  *   need to be called if a call to ``rte_malloc_heap_memory_remove`` will be
 401  *   called in current process.
 402  *
 403  * @param heap_name
 404  *   Heap name to which this chunk of memory belongs
 405  * @param va_addr
 406  *   Start address of memory chunk to attach to
 407  * @param len
 408  *   Length of memory chunk to attach to
 409  * @return
 410  *   0 on successful detach
 411  *   -1 on unsuccessful detach, with rte_errno set to indicate cause for error:
 412  *     EINVAL - one of the parameters was invalid
 413  *     EPERM  - attempted to detach memory from a reserved heap
 414  *     ENOENT - heap or memory chunk was not found
 415  */
 416 __rte_experimental
 417 int
 418 rte_malloc_heap_memory_detach(const char *heap_name, void *va_addr, size_t len);
 419
 420 /**
 421  * Creates a new empty malloc heap with a specified name.
 422  *
 423  * @note Heaps created via this call will automatically get assigned a unique
 424  *   socket ID, which can be found using ``rte_malloc_heap_get_socket()``
 425  *
 426  * @param heap_name
 427  *   Name of the heap to create.
 428  *
 429  * @return
 430  *   - 0 on successful creation
 431  *   - -1 in case of error, with rte_errno set to one of the following:
 432  *     EINVAL - ``heap_name`` was NULL, empty or too long
 433  *     EEXIST - heap by name of ``heap_name`` already exists
 434  *     ENOSPC - no more space in internal config to store a new heap
 435  */
 436 __rte_experimental
 437 int
 438 rte_malloc_heap_create(const char *heap_name);
 439
 440 /**
 441  * Destroys a previously created malloc heap with specified name.
 442  *
 443  * @note This function will return a failure result if not all memory allocated
 444  *   from the heap has been freed back to the heap
 445  *
 446  * @note This function will return a failure result if not all memory segments
 447  *   were removed from the heap prior to its destruction
 448  *
 449  * @param heap_name
 450  *   Name of the heap to create.
 451  *
 452  * @return
 453  *   - 0 on success
 454  *   - -1 in case of error, with rte_errno set to one of the following:
 455  *     EINVAL - ``heap_name`` was NULL, empty or too long
 456  *     ENOENT - heap by the name of ``heap_name`` was not found
 457  *     EPERM  - attempting to destroy reserved heap
 458  *     EBUSY  - heap still contains data
 459  */
 460 __rte_experimental
 461 int
 462 rte_malloc_heap_destroy(const char *heap_name);
 463
 464 /**
 465  * Find socket ID corresponding to a named heap.
 466  *
 467  * @param name
 468  *   Heap name to find socket ID for
 469  * @return
 470  *   Socket ID in case of success (a non-negative number)
 471  *   -1 in case of error, with rte_errno set to one of the following:
 472  *     EINVAL - ``name`` was NULL
 473  *     ENOENT - heap identified by the name ``name`` was not found
 474  */
 475 __rte_experimental
 476 int
 477 rte_malloc_heap_get_socket(const char *name);
 478
 479 /**
 480  * Check if a given socket ID refers to externally allocated memory.
 481  *
 482  * @note Passing SOCKET_ID_ANY will return 0.
 483  *
 484  * @param socket_id
 485  *   Socket ID to check
 486  * @return
 487  *   1 if socket ID refers to externally allocated memory
 488  *   0 if socket ID refers to internal DPDK memory
 489  *   -1 if socket ID is invalid
 490  */
 491 __rte_experimental
 492 int
 493 rte_malloc_heap_socket_is_external(int socket_id);
 494
 495 /**
 496  * Dump statistics.
 497  *
 498  * Dump for the specified type to a file. If the type argument is
 499  * NULL, all memory types will be dumped.
 500  *
 501  * @note This function is not thread-safe with respect to
 502  *    ``rte_malloc_heap_create()``/``rte_malloc_heap_destroy()`` functions.
 503  *
 504  * @param f
 505  *   A pointer to a file for output
 506  * @param type
 507  *   A string identifying the type of objects to dump, or NULL
 508  *   to dump all objects.
 509  */
 510 void
 511 rte_malloc_dump_stats(FILE *f, const char *type);
 512
 513 /**
 514  * Dump contents of all malloc heaps to a file.
 515  *
 516  * @note This function is not thread-safe with respect to
 517  *    ``rte_malloc_heap_create()``/``rte_malloc_heap_destroy()`` functions.
 518  *
 519  * @param f
 520  *   A pointer to a file for output
 521  */
 522 __rte_experimental
 523 void
 524 rte_malloc_dump_heaps(FILE *f);
 525
 526 /**
 527  * Set the maximum amount of allocated memory for this type.
 528  *
 529  * This is not yet implemented
 530  *
 531  * @param type
 532  *   A string identifying the type of allocated objects.
 533  * @param max
 534  *   The maximum amount of allocated bytes for this type.
 535  * @return
 536  *   - 0: Success.
 537  *   - (-1): Error.
 538  */
 539 __rte_deprecated
 540 int
 541 rte_malloc_set_limit(const char *type, size_t max);
 542
 543 /**
 544  * Return the IO address of a virtual address obtained through
 545  * rte_malloc
 546  *
 547  * @param addr
 548  *   Address obtained from a previous rte_malloc call
 549  * @return
 550  *   RTE_BAD_IOVA on error
 551  *   otherwise return an address suitable for IO
 552  */
 553 rte_iova_t
 554 rte_malloc_virt2iova(const void *addr);
 555
 556 #ifdef __cplusplus
 557 }
 558 #endif
 559
 560 #endif /* _RTE_MALLOC_H_ */