1 /*
2 * Copyright (c) 2015-2017, Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included
12 * in all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 */
22 //!
23 //! \file mhw_memory_pool.cpp
24 //! \brief This modules implements simple memory pool infrastructure for MHW
25 //!
26 #include "mhw_memory_pool.h"
27 #include "mhw_state_heap.h"
28
29 typedef struct _MHW_MEMORY_POOL_ENTRY
30 {
31 PMHW_MEMORY_POOL_ENTRY pNext; //!< Next pool entry (doubled linked list)
32 PMHW_MEMORY_POOL_ENTRY pPrev; //!< Prev pool entry (doubled linked list)
33 PMHW_MEMORY_POOL pPool; //!< Pool object
34 void *pAllocation; //!< Memory allocation from malloc (to be freed)
35 uint32_t dwSize; //!< Memory size allocated from malloc
36 void *pObjects; //!< Pointer to first object in this pool entry
37 uint32_t dwCount; //!< Number of objects in this pool allocation
38 } MHW_MEMORY_POOL_ENTRY, *PMHW_MEMORY_POOL_ENTRY;
39
MHW_MEMORY_POOL(uint32_t dwObjSize,uint32_t dwObjAlignment)40 MHW_MEMORY_POOL::MHW_MEMORY_POOL(uint32_t dwObjSize, uint32_t dwObjAlignment):
41 m_pFirst(nullptr),
42 m_pLast (nullptr),
43 m_dwCount(0),
44 m_dwSize(0),
45 m_dwObjSize(dwObjSize),
46 m_dwObjAlignment(dwObjAlignment),
47 m_dwObjCount(0)
48 {
49
50 }
51
~MHW_MEMORY_POOL()52 MHW_MEMORY_POOL::~MHW_MEMORY_POOL()
53 {
54 PMHW_MEMORY_POOL_ENTRY pEntry;
55 PMHW_MEMORY_POOL_ENTRY pNext;
56
57 pEntry = m_pFirst;
58 while (pEntry)
59 {
60 pNext = pEntry->pNext;
61 if (pEntry->pAllocation)
62 {
63 MOS_FreeMemory(pEntry->pAllocation);
64 }
65 pEntry = pNext;
66 }
67 }
68
69 // Allocate an array of objects to be added to the pool
Allocate(uint32_t dwObjCount)70 void *MHW_MEMORY_POOL::Allocate(uint32_t dwObjCount)
71 {
72 uint8_t *pObjects = nullptr;
73 uint32_t dwSize;
74 PMHW_MEMORY_POOL_ENTRY pEntry = nullptr;
75
76 if (dwObjCount == 0)
77 {
78 return nullptr;
79 }
80
81 // Calculate total size - pool entry + objects + alignments
82 dwSize = sizeof(MHW_MEMORY_POOL_ENTRY);
83 dwSize += m_dwObjSize * dwObjCount + m_dwObjAlignment;
84
85 pEntry = (PMHW_MEMORY_POOL_ENTRY) MOS_AllocMemory(dwSize);
86 if (!pEntry)
87 {
88 return nullptr;
89 }
90 MOS_ZeroMemory(pEntry, dwSize);
91
92 pObjects = ((uint8_t*) pEntry) + sizeof(MHW_MEMORY_POOL_ENTRY);
93
94 // adjust alignment if necessary
95 if ((uintptr_t(pObjects) % m_dwObjAlignment))
96 {
97 // clear out lower bits
98 pObjects = (uint8_t*)((uintptr_t)pObjects & (~(uintptr_t)(m_dwObjAlignment - 1)));
99 // add alignment
100 pObjects += m_dwObjAlignment;
101 }
102
103 // Insert pool entry into linked list
104 pEntry->pNext = nullptr;
105 pEntry->pPrev = m_pLast;
106 m_pLast = pEntry;
107
108 if (pEntry->pPrev) pEntry->pPrev->pNext = pEntry;
109
110 if (!m_pFirst) m_pFirst = pEntry;
111
112 // Setup pool entry
113 pEntry->pPool = this;
114 pEntry->pAllocation = (void *)pEntry;
115 pEntry->dwSize = dwSize;
116 pEntry->pObjects = pObjects;
117 pEntry->dwCount = dwObjCount;
118
119 // Update pool object
120 m_dwCount++;
121 m_dwSize += dwSize;
122 m_dwObjCount += dwObjCount;
123
124 return pObjects;
125 }
126