ceph/src/dpdk/lib/librte_eal/common/include/rte_memory.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef _RTE_MEMORY_H_
  35 #define _RTE_MEMORY_H_
  36
  37 /**
  38  * @file
  39  *
  40  * Memory-related RTE API.
  41  */
  42
  43 #include <stdint.h>
  44 #include <stddef.h>
  45 #include <stdio.h>
  46
  47 #include <rte_config.h>
  48
  49 #ifdef RTE_EXEC_ENV_LINUXAPP
  50 #include <exec-env/rte_dom0_common.h>
  51 #endif
  52
  53 #ifdef __cplusplus
  54 extern "C" {
  55 #endif
  56
  57 #include <rte_common.h>
  58
  59 __extension__
  60 enum rte_page_sizes {
  61         RTE_PGSIZE_4K    = 1ULL << 12,
  62         RTE_PGSIZE_64K   = 1ULL << 16,
  63         RTE_PGSIZE_256K  = 1ULL << 18,
  64         RTE_PGSIZE_2M    = 1ULL << 21,
  65         RTE_PGSIZE_16M   = 1ULL << 24,
  66         RTE_PGSIZE_256M  = 1ULL << 28,
  67         RTE_PGSIZE_512M  = 1ULL << 29,
  68         RTE_PGSIZE_1G    = 1ULL << 30,
  69         RTE_PGSIZE_4G    = 1ULL << 32,
  70         RTE_PGSIZE_16G   = 1ULL << 34,
  71 };
  72
  73 #define SOCKET_ID_ANY -1                    /**< Any NUMA socket. */
  74 #define RTE_CACHE_LINE_MASK (RTE_CACHE_LINE_SIZE-1) /**< Cache line mask. */
  75
  76 #define RTE_CACHE_LINE_ROUNDUP(size) \
  77         (RTE_CACHE_LINE_SIZE * ((size + RTE_CACHE_LINE_SIZE - 1) / RTE_CACHE_LINE_SIZE))
  78 /**< Return the first cache-aligned value greater or equal to size. */
  79
  80 /**< Cache line size in terms of log2 */
  81 #if RTE_CACHE_LINE_SIZE == 64
  82 #define RTE_CACHE_LINE_SIZE_LOG2 6
  83 #elif RTE_CACHE_LINE_SIZE == 128
  84 #define RTE_CACHE_LINE_SIZE_LOG2 7
  85 #else
  86 #error "Unsupported cache line size"
  87 #endif
  88
  89 #define RTE_CACHE_LINE_MIN_SIZE 64      /**< Minimum Cache line size. */
  90
  91 /**
  92  * Force alignment to cache line.
  93  */
  94 #define __rte_cache_aligned __rte_aligned(RTE_CACHE_LINE_SIZE)
  95
  96 /**
  97  * Force minimum cache line alignment.
  98  */
  99 #define __rte_cache_min_aligned __rte_aligned(RTE_CACHE_LINE_MIN_SIZE)
 100
 101 typedef uint64_t phys_addr_t; /**< Physical address definition. */
 102 #define RTE_BAD_PHYS_ADDR ((phys_addr_t)-1)
 103
 104 /**
 105  * Physical memory segment descriptor.
 106  */
 107 struct rte_memseg {
 108         phys_addr_t phys_addr;      /**< Start physical address. */
 109         RTE_STD_C11
 110         union {
 111                 void *addr;         /**< Start virtual address. */
 112                 uint64_t addr_64;   /**< Makes sure addr is always 64 bits */
 113         };
 114         size_t len;               /**< Length of the segment. */
 115         uint64_t hugepage_sz;       /**< The pagesize of underlying memory */
 116         int32_t socket_id;          /**< NUMA socket ID. */
 117         uint32_t nchannel;          /**< Number of channels. */
 118         uint32_t nrank;             /**< Number of ranks. */
 119 #ifdef RTE_LIBRTE_XEN_DOM0
 120          /**< store segment MFNs */
 121         uint64_t mfn[DOM0_NUM_MEMBLOCK];
 122 #endif
 123 } __rte_packed;
 124
 125 /**
 126  * Lock page in physical memory and prevent from swapping.
 127  *
 128  * @param virt
 129  *   The virtual address.
 130  * @return
 131  *   0 on success, negative on error.
 132  */
 133 int rte_mem_lock_page(const void *virt);
 134
 135 /**
 136  * Get physical address of any mapped virtual address in the current process.
 137  * It is found by browsing the /proc/self/pagemap special file.
 138  * The page must be locked.
 139  *
 140  * @param virt
 141  *   The virtual address.
 142  * @return
 143  *   The physical address or RTE_BAD_PHYS_ADDR on error.
 144  */
 145 phys_addr_t rte_mem_virt2phy(const void *virt);
 146
 147 /**
 148  * Get the layout of the available physical memory.
 149  *
 150  * It can be useful for an application to have the full physical
 151  * memory layout to decide the size of a memory zone to reserve. This
 152  * table is stored in rte_config (see rte_eal_get_configuration()).
 153  *
 154  * @return
 155  *  - On success, return a pointer to a read-only table of struct
 156  *    rte_physmem_desc elements, containing the layout of all
 157  *    addressable physical memory. The last element of the table
 158  *    contains a NULL address.
 159  *  - On error, return NULL. This should not happen since it is a fatal
 160  *    error that will probably cause the entire system to panic.
 161  */
 162 const struct rte_memseg *rte_eal_get_physmem_layout(void);
 163
 164 /**
 165  * Dump the physical memory layout to a file.
 166  *
 167  * @param f
 168  *   A pointer to a file for output
 169  */
 170 void rte_dump_physmem_layout(FILE *f);
 171
 172 /**
 173  * Get the total amount of available physical memory.
 174  *
 175  * @return
 176  *    The total amount of available physical memory in bytes.
 177  */
 178 uint64_t rte_eal_get_physmem_size(void);
 179
 180 /**
 181  * Get the number of memory channels.
 182  *
 183  * @return
 184  *   The number of memory channels on the system. The value is 0 if unknown
 185  *   or not the same on all devices.
 186  */
 187 unsigned rte_memory_get_nchannel(void);
 188
 189 /**
 190  * Get the number of memory ranks.
 191  *
 192  * @return
 193  *   The number of memory ranks on the system. The value is 0 if unknown or
 194  *   not the same on all devices.
 195  */
 196 unsigned rte_memory_get_nrank(void);
 197
 198 #ifdef RTE_LIBRTE_XEN_DOM0
 199
 200 /**< Internal use only - should DOM0 memory mapping be used */
 201 int rte_xen_dom0_supported(void);
 202
 203 /**< Internal use only - phys to virt mapping for xen */
 204 phys_addr_t rte_xen_mem_phy2mch(int32_t, const phys_addr_t);
 205
 206 /**
 207  * Return the physical address of elt, which is an element of the pool mp.
 208  *
 209  * @param memseg_id
 210  *   Identifier of the memory segment owning the physical address. If
 211  *   set to -1, find it automatically.
 212  * @param phy_addr
 213  *   physical address of elt.
 214  *
 215  * @return
 216  *   The physical address or RTE_BAD_PHYS_ADDR on error.
 217  */
 218 static inline phys_addr_t
 219 rte_mem_phy2mch(int32_t memseg_id, const phys_addr_t phy_addr)
 220 {
 221         if (rte_xen_dom0_supported())
 222                 return rte_xen_mem_phy2mch(memseg_id, phy_addr);
 223         else
 224                 return phy_addr;
 225 }
 226
 227 /**
 228  * Memory init for supporting application running on Xen domain0.
 229  *
 230  * @param void
 231  *
 232  * @return
 233  *       0: successfully
 234  *       negative: error
 235  */
 236 int rte_xen_dom0_memory_init(void);
 237
 238 /**
 239  * Attach to memory setments of primary process on Xen domain0.
 240  *
 241  * @param void
 242  *
 243  * @return
 244  *       0: successfully
 245  *       negative: error
 246  */
 247 int rte_xen_dom0_memory_attach(void);
 248 #else
 249 static inline int rte_xen_dom0_supported(void)
 250 {
 251         return 0;
 252 }
 253
 254 static inline phys_addr_t
 255 rte_mem_phy2mch(int32_t memseg_id __rte_unused, const phys_addr_t phy_addr)
 256 {
 257         return phy_addr;
 258 }
 259 #endif
 260
 261 #ifdef __cplusplus
 262 }
 263 #endif
 264
 265 #endif /* _RTE_MEMORY_H_ */