drivers/gpu/arm/mali400/mali/linux/mali_memory_block_alloc.c

   1 /*
   2  * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
   3  *
   4  * This program is free software and is provided to you under the terms of the GNU General Public License version 2
   5  * as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
   6  *
   7  * A copy of the licence is included with the program, and can also be obtained from Free Software
   8  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
   9  */
  10 #include "mali_kernel_common.h"
  11 #include "mali_memory.h"
  12 #include "mali_memory_block_alloc.h"
  13 #include "mali_osk.h"
  14 #include <linux/mutex.h>
  15 #define MALI_BLOCK_SIZE (256UL * 1024UL)  /* 256 kB, remember to keep the ()s */
  16
  17 struct block_info {
  18         struct block_info *next;
  19 };
  20
  21 typedef struct block_info block_info;
  22
  23
  24 typedef struct block_allocator {
  25         struct mutex mutex;
  26         block_info *all_blocks;
  27         block_info *first_free;
  28         u32 base;
  29         u32 cpu_usage_adjust;
  30         u32 num_blocks;
  31         u32 free_blocks;
  32 } block_allocator;
  33
  34 static block_allocator *mali_mem_block_gobal_allocator = NULL;
  35
  36 MALI_STATIC_INLINE u32 get_phys(block_allocator *info, block_info *block)
  37 {
  38         return info->base + ((block - info->all_blocks) * MALI_BLOCK_SIZE);
  39 }
  40
  41 static mali_mem_allocator *mali_mem_block_allocator_create(u32 base_address, u32 cpu_usage_adjust, u32 size)
  42 {
  43         block_allocator *info;
  44         u32 usable_size;
  45         u32 num_blocks;
  46
  47         usable_size = size & ~(MALI_BLOCK_SIZE - 1);
  48         MALI_DEBUG_PRINT(3, ("Mali block allocator create for region starting at 0x%08X length 0x%08X\n", base_address, size));
  49         MALI_DEBUG_PRINT(4, ("%d usable bytes\n", usable_size));
  50         num_blocks = usable_size / MALI_BLOCK_SIZE;
  51         MALI_DEBUG_PRINT(4, ("which becomes %d blocks\n", num_blocks));
  52
  53         if (usable_size == 0) {
  54                 MALI_DEBUG_PRINT(1, ("Memory block of size %d is unusable\n", size));
  55                 return NULL;
  56         }
  57
  58         info = _mali_osk_malloc(sizeof(block_allocator));
  59         if (NULL != info) {
  60                 mutex_init(&info->mutex);
  61                 info->all_blocks = _mali_osk_malloc(sizeof(block_info) * num_blocks);
  62                 if (NULL != info->all_blocks) {
  63                         u32 i;
  64                         info->first_free = NULL;
  65                         info->num_blocks = num_blocks;
  66                         info->free_blocks = num_blocks;
  67
  68                         info->base = base_address;
  69                         info->cpu_usage_adjust = cpu_usage_adjust;
  70
  71                         for (i = 0; i < num_blocks; i++) {
  72                                 info->all_blocks[i].next = info->first_free;
  73                                 info->first_free = &info->all_blocks[i];
  74                         }
  75
  76                         return (mali_mem_allocator *)info;
  77                 }
  78                 _mali_osk_free(info);
  79         }
  80
  81         return NULL;
  82 }
  83
  84 void mali_mem_block_allocator_destroy(mali_mem_allocator *allocator)
  85 {
  86         block_allocator *info = (block_allocator *)allocator;
  87
  88         info = mali_mem_block_gobal_allocator;
  89         if (NULL == info) return;
  90
  91         MALI_DEBUG_ASSERT_POINTER(info);
  92
  93         _mali_osk_free(info->all_blocks);
  94         _mali_osk_free(info);
  95 }
  96
  97 static void mali_mem_block_mali_map(mali_mem_allocation *descriptor, u32 phys, u32 virt, u32 size)
  98 {
  99         struct mali_page_directory *pagedir = descriptor->session->page_directory;
 100         u32 prop = descriptor->mali_mapping.properties;
 101         u32 offset = 0;
 102
 103         while (size) {
 104                 mali_mmu_pagedir_update(pagedir, virt + offset, phys + offset, MALI_MMU_PAGE_SIZE, prop);
 105
 106                 size -= MALI_MMU_PAGE_SIZE;
 107                 offset += MALI_MMU_PAGE_SIZE;
 108         }
 109 }
 110
 111 static int mali_mem_block_cpu_map(mali_mem_allocation *descriptor, struct vm_area_struct *vma, u32 mali_phys, u32 mapping_offset, u32 size, u32 cpu_usage_adjust)
 112 {
 113         u32 virt = vma->vm_start + mapping_offset;
 114         u32 cpu_phys = mali_phys + cpu_usage_adjust;
 115         u32 offset = 0;
 116         int ret;
 117
 118         while (size) {
 119                 ret = vm_insert_pfn(vma, virt + offset, __phys_to_pfn(cpu_phys + offset));
 120
 121                 if (unlikely(ret)) {
 122                         MALI_DEBUG_PRINT(1, ("Block allocator: Failed to insert pfn into vma\n"));
 123                         return 1;
 124                 }
 125
 126                 size -= MALI_MMU_PAGE_SIZE;
 127                 offset += MALI_MMU_PAGE_SIZE;
 128         }
 129
 130         return 0;
 131 }
 132
 133 mali_mem_allocation *mali_mem_block_alloc(u32 mali_addr, u32 size, struct vm_area_struct *vma, struct mali_session_data *session)
 134 {
 135         _mali_osk_errcode_t err;
 136         mali_mem_allocation *descriptor;
 137         block_allocator *info;
 138         u32 left;
 139         block_info *last_allocated = NULL;
 140         block_allocator_allocation *ret_allocation;
 141         u32 offset = 0;
 142
 143         size = ALIGN(size, MALI_BLOCK_SIZE);
 144
 145         info = mali_mem_block_gobal_allocator;
 146         if (NULL == info) return NULL;
 147
 148         left = size;
 149         MALI_DEBUG_ASSERT(0 != left);
 150
 151         descriptor = mali_mem_descriptor_create(session, MALI_MEM_BLOCK);
 152         if (NULL == descriptor) {
 153                 return NULL;
 154         }
 155
 156         descriptor->mali_mapping.addr = mali_addr;
 157         descriptor->size = size;
 158         descriptor->cpu_mapping.addr = (void __user *)vma->vm_start;
 159         descriptor->cpu_mapping.ref = 1;
 160
 161         if (VM_SHARED == (VM_SHARED & vma->vm_flags)) {
 162                 descriptor->mali_mapping.properties = MALI_MMU_FLAGS_DEFAULT;
 163         } else {
 164                 /* Cached Mali memory mapping */
 165                 descriptor->mali_mapping.properties = MALI_MMU_FLAGS_FORCE_GP_READ_ALLOCATE;
 166                 vma->vm_flags |= VM_SHARED;
 167         }
 168
 169         ret_allocation = &descriptor->block_mem.mem;
 170
 171         ret_allocation->mapping_length = 0;
 172
 173         _mali_osk_mutex_wait(session->memory_lock);
 174         mutex_lock(&info->mutex);
 175
 176         if (left > (info->free_blocks * MALI_BLOCK_SIZE)) {
 177                 MALI_DEBUG_PRINT(2, ("Mali block allocator: not enough free blocks to service allocation (%u)\n", left));
 178                 mutex_unlock(&info->mutex);
 179                 _mali_osk_mutex_signal(session->memory_lock);
 180                 mali_mem_descriptor_destroy(descriptor);
 181                 return NULL;
 182         }
 183
 184         err = mali_mem_mali_map_prepare(descriptor);
 185         if (_MALI_OSK_ERR_OK != err) {
 186                 mutex_unlock(&info->mutex);
 187                 _mali_osk_mutex_signal(session->memory_lock);
 188                 mali_mem_descriptor_destroy(descriptor);
 189                 return NULL;
 190         }
 191
 192         while ((left > 0) && (info->first_free)) {
 193                 block_info *block;
 194                 u32 phys_addr;
 195                 u32 current_mapping_size;
 196
 197                 block = info->first_free;
 198                 info->first_free = info->first_free->next;
 199                 block->next = last_allocated;
 200                 last_allocated = block;
 201
 202                 phys_addr = get_phys(info, block);
 203
 204                 if (MALI_BLOCK_SIZE < left) {
 205                         current_mapping_size = MALI_BLOCK_SIZE;
 206                 } else {
 207                         current_mapping_size = left;
 208                 }
 209
 210                 mali_mem_block_mali_map(descriptor, phys_addr, mali_addr + offset, current_mapping_size);
 211                 if (mali_mem_block_cpu_map(descriptor, vma, phys_addr, offset, current_mapping_size, info->cpu_usage_adjust)) {
 212                         /* release all memory back to the pool */
 213                         while (last_allocated) {
 214                                 /* This relinks every block we've just allocated back into the free-list */
 215                                 block = last_allocated->next;
 216                                 last_allocated->next = info->first_free;
 217                                 info->first_free = last_allocated;
 218                                 last_allocated = block;
 219                         }
 220
 221                         mutex_unlock(&info->mutex);
 222                         _mali_osk_mutex_signal(session->memory_lock);
 223
 224                         mali_mem_mali_map_free(descriptor);
 225                         mali_mem_descriptor_destroy(descriptor);
 226
 227                         return NULL;
 228                 }
 229
 230                 left -= current_mapping_size;
 231                 offset += current_mapping_size;
 232                 ret_allocation->mapping_length += current_mapping_size;
 233
 234                 --info->free_blocks;
 235         }
 236
 237         mutex_unlock(&info->mutex);
 238         _mali_osk_mutex_signal(session->memory_lock);
 239
 240         MALI_DEBUG_ASSERT(0 == left);
 241
 242         /* Record all the information about this allocation */
 243         ret_allocation->last_allocated = last_allocated;
 244         ret_allocation->info = info;
 245
 246         return descriptor;
 247 }
 248
 249 void mali_mem_block_release(mali_mem_allocation *descriptor)
 250 {
 251         block_allocator *info = descriptor->block_mem.mem.info;
 252         block_info *block, *next;
 253         block_allocator_allocation *allocation = &descriptor->block_mem.mem;
 254
 255         MALI_DEBUG_ASSERT(MALI_MEM_BLOCK == descriptor->type);
 256
 257         block = allocation->last_allocated;
 258
 259         MALI_DEBUG_ASSERT_POINTER(block);
 260
 261         /* unmap */
 262         mali_mem_mali_map_free(descriptor);
 263
 264         mutex_lock(&info->mutex);
 265
 266         while (block) {
 267                 MALI_DEBUG_ASSERT(!((block < info->all_blocks) || (block > (info->all_blocks + info->num_blocks))));
 268
 269                 next = block->next;
 270
 271                 /* relink into free-list */
 272                 block->next = info->first_free;
 273                 info->first_free = block;
 274
 275                 /* advance the loop */
 276                 block = next;
 277
 278                 ++info->free_blocks;
 279         }
 280
 281         mutex_unlock(&info->mutex);
 282 }
 283
 284 u32 mali_mem_block_allocator_stat(void)
 285 {
 286         block_allocator *info = (block_allocator *)mali_mem_block_gobal_allocator;
 287
 288         if (NULL == info) return 0;
 289
 290         MALI_DEBUG_ASSERT_POINTER(info);
 291
 292         return (info->num_blocks - info->free_blocks) * MALI_BLOCK_SIZE;
 293 }
 294
 295 _mali_osk_errcode_t mali_memory_core_resource_dedicated_memory(u32 start, u32 size)
 296 {
 297         mali_mem_allocator *allocator;
 298
 299         /* Do the low level linux operation first */
 300
 301         /* Request ownership of the memory */
 302         if (_MALI_OSK_ERR_OK != _mali_osk_mem_reqregion(start, size, "Dedicated Mali GPU memory")) {
 303                 MALI_DEBUG_PRINT(1, ("Failed to request memory region for frame buffer (0x%08X - 0x%08X)\n", start, start + size - 1));
 304                 return _MALI_OSK_ERR_FAULT;
 305         }
 306
 307         /* Create generic block allocator object to handle it */
 308         allocator = mali_mem_block_allocator_create(start, 0 /* cpu_usage_adjust */, size);
 309
 310         if (NULL == allocator) {
 311                 MALI_DEBUG_PRINT(1, ("Memory bank registration failed\n"));
 312                 _mali_osk_mem_unreqregion(start, size);
 313                 MALI_ERROR(_MALI_OSK_ERR_FAULT);
 314         }
 315
 316         mali_mem_block_gobal_allocator = (block_allocator *)allocator;
 317
 318         return _MALI_OSK_ERR_OK;
 319 }