arch/blackfin/mm/sram-alloc.c

   1 /*
   2  * SRAM allocator for Blackfin on-chip memory
   3  *
   4  * Copyright 2004-2009 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/types.h>
  12 #include <linux/miscdevice.h>
  13 #include <linux/ioport.h>
  14 #include <linux/fcntl.h>
  15 #include <linux/init.h>
  16 #include <linux/poll.h>
  17 #include <linux/proc_fs.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/rtc.h>
  20 #include <linux/slab.h>
  21 #include <asm/blackfin.h>
  22 #include <asm/mem_map.h>
  23 #include "blackfin_sram.h"
  24
  25 /* the data structure for L1 scratchpad and DATA SRAM */
  26 struct sram_piece {
  27         void *paddr;
  28         int size;
  29         pid_t pid;
  30         struct sram_piece *next;
  31 };
  32
  33 static DEFINE_PER_CPU_SHARED_ALIGNED(spinlock_t, l1sram_lock);
  34 static DEFINE_PER_CPU(struct sram_piece, free_l1_ssram_head);
  35 static DEFINE_PER_CPU(struct sram_piece, used_l1_ssram_head);
  36
  37 #if L1_DATA_A_LENGTH != 0
  38 static DEFINE_PER_CPU(struct sram_piece, free_l1_data_A_sram_head);
  39 static DEFINE_PER_CPU(struct sram_piece, used_l1_data_A_sram_head);
  40 #endif
  41
  42 #if L1_DATA_B_LENGTH != 0
  43 static DEFINE_PER_CPU(struct sram_piece, free_l1_data_B_sram_head);
  44 static DEFINE_PER_CPU(struct sram_piece, used_l1_data_B_sram_head);
  45 #endif
  46
  47 #if L1_DATA_A_LENGTH || L1_DATA_B_LENGTH
  48 static DEFINE_PER_CPU_SHARED_ALIGNED(spinlock_t, l1_data_sram_lock);
  49 #endif
  50
  51 #if L1_CODE_LENGTH != 0
  52 static DEFINE_PER_CPU_SHARED_ALIGNED(spinlock_t, l1_inst_sram_lock);
  53 static DEFINE_PER_CPU(struct sram_piece, free_l1_inst_sram_head);
  54 static DEFINE_PER_CPU(struct sram_piece, used_l1_inst_sram_head);
  55 #endif
  56
  57 #if L2_LENGTH != 0
  58 static spinlock_t l2_sram_lock ____cacheline_aligned_in_smp;
  59 static struct sram_piece free_l2_sram_head, used_l2_sram_head;
  60 #endif
  61
  62 static struct kmem_cache *sram_piece_cache;
  63
  64 /* L1 Scratchpad SRAM initialization function */
  65 static void __init l1sram_init(void)
  66 {
  67         unsigned int cpu;
  68         unsigned long reserve;
  69
  70 #ifdef CONFIG_SMP
  71         reserve = 0;
  72 #else
  73         reserve = sizeof(struct l1_scratch_task_info);
  74 #endif
  75
  76         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
  77                 per_cpu(free_l1_ssram_head, cpu).next =
  78                         kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
  79                 if (!per_cpu(free_l1_ssram_head, cpu).next) {
  80                         printk(KERN_INFO "Fail to initialize Scratchpad data SRAM.\n");
  81                         return;
  82                 }
  83
  84                 per_cpu(free_l1_ssram_head, cpu).next->paddr = (void *)get_l1_scratch_start_cpu(cpu) + reserve;
  85                 per_cpu(free_l1_ssram_head, cpu).next->size = L1_SCRATCH_LENGTH - reserve;
  86                 per_cpu(free_l1_ssram_head, cpu).next->pid = 0;
  87                 per_cpu(free_l1_ssram_head, cpu).next->next = NULL;
  88
  89                 per_cpu(used_l1_ssram_head, cpu).next = NULL;
  90
  91                 /* mutex initialize */
  92                 spin_lock_init(&per_cpu(l1sram_lock, cpu));
  93                 printk(KERN_INFO "Blackfin Scratchpad data SRAM: %d KB\n",
  94                         L1_SCRATCH_LENGTH >> 10);
  95         }
  96 }
  97
  98 static void __init l1_data_sram_init(void)
  99 {
 100 #if L1_DATA_A_LENGTH != 0 || L1_DATA_B_LENGTH != 0
 101         unsigned int cpu;
 102 #endif
 103 #if L1_DATA_A_LENGTH != 0
 104         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
 105                 per_cpu(free_l1_data_A_sram_head, cpu).next =
 106                         kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 107                 if (!per_cpu(free_l1_data_A_sram_head, cpu).next) {
 108                         printk(KERN_INFO "Fail to initialize L1 Data A SRAM.\n");
 109                         return;
 110                 }
 111
 112                 per_cpu(free_l1_data_A_sram_head, cpu).next->paddr =
 113                         (void *)get_l1_data_a_start_cpu(cpu) + (_ebss_l1 - _sdata_l1);
 114                 per_cpu(free_l1_data_A_sram_head, cpu).next->size =
 115                         L1_DATA_A_LENGTH - (_ebss_l1 - _sdata_l1);
 116                 per_cpu(free_l1_data_A_sram_head, cpu).next->pid = 0;
 117                 per_cpu(free_l1_data_A_sram_head, cpu).next->next = NULL;
 118
 119                 per_cpu(used_l1_data_A_sram_head, cpu).next = NULL;
 120
 121                 printk(KERN_INFO "Blackfin L1 Data A SRAM: %d KB (%d KB free)\n",
 122                         L1_DATA_A_LENGTH >> 10,
 123                         per_cpu(free_l1_data_A_sram_head, cpu).next->size >> 10);
 124         }
 125 #endif
 126 #if L1_DATA_B_LENGTH != 0
 127         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
 128                 per_cpu(free_l1_data_B_sram_head, cpu).next =
 129                         kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 130                 if (!per_cpu(free_l1_data_B_sram_head, cpu).next) {
 131                         printk(KERN_INFO "Fail to initialize L1 Data B SRAM.\n");
 132                         return;
 133                 }
 134
 135                 per_cpu(free_l1_data_B_sram_head, cpu).next->paddr =
 136                         (void *)get_l1_data_b_start_cpu(cpu) + (_ebss_b_l1 - _sdata_b_l1);
 137                 per_cpu(free_l1_data_B_sram_head, cpu).next->size =
 138                         L1_DATA_B_LENGTH - (_ebss_b_l1 - _sdata_b_l1);
 139                 per_cpu(free_l1_data_B_sram_head, cpu).next->pid = 0;
 140                 per_cpu(free_l1_data_B_sram_head, cpu).next->next = NULL;
 141
 142                 per_cpu(used_l1_data_B_sram_head, cpu).next = NULL;
 143
 144                 printk(KERN_INFO "Blackfin L1 Data B SRAM: %d KB (%d KB free)\n",
 145                         L1_DATA_B_LENGTH >> 10,
 146                         per_cpu(free_l1_data_B_sram_head, cpu).next->size >> 10);
 147                 /* mutex initialize */
 148         }
 149 #endif
 150
 151 #if L1_DATA_A_LENGTH != 0 || L1_DATA_B_LENGTH != 0
 152         for (cpu = 0; cpu < num_possible_cpus(); ++cpu)
 153                 spin_lock_init(&per_cpu(l1_data_sram_lock, cpu));
 154 #endif
 155 }
 156
 157 static void __init l1_inst_sram_init(void)
 158 {
 159 #if L1_CODE_LENGTH != 0
 160         unsigned int cpu;
 161         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
 162                 per_cpu(free_l1_inst_sram_head, cpu).next =
 163                         kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 164                 if (!per_cpu(free_l1_inst_sram_head, cpu).next) {
 165                         printk(KERN_INFO "Failed to initialize L1 Instruction SRAM\n");
 166                         return;
 167                 }
 168
 169                 per_cpu(free_l1_inst_sram_head, cpu).next->paddr =
 170                         (void *)get_l1_code_start_cpu(cpu) + (_etext_l1 - _stext_l1);
 171                 per_cpu(free_l1_inst_sram_head, cpu).next->size =
 172                         L1_CODE_LENGTH - (_etext_l1 - _stext_l1);
 173                 per_cpu(free_l1_inst_sram_head, cpu).next->pid = 0;
 174                 per_cpu(free_l1_inst_sram_head, cpu).next->next = NULL;
 175
 176                 per_cpu(used_l1_inst_sram_head, cpu).next = NULL;
 177
 178                 printk(KERN_INFO "Blackfin L1 Instruction SRAM: %d KB (%d KB free)\n",
 179                         L1_CODE_LENGTH >> 10,
 180                         per_cpu(free_l1_inst_sram_head, cpu).next->size >> 10);
 181
 182                 /* mutex initialize */
 183                 spin_lock_init(&per_cpu(l1_inst_sram_lock, cpu));
 184         }
 185 #endif
 186 }
 187
 188 static void __init l2_sram_init(void)
 189 {
 190 #if L2_LENGTH != 0
 191         free_l2_sram_head.next =
 192                 kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 193         if (!free_l2_sram_head.next) {
 194                 printk(KERN_INFO "Fail to initialize L2 SRAM.\n");
 195                 return;
 196         }
 197
 198         free_l2_sram_head.next->paddr =
 199                 (void *)L2_START + (_ebss_l2 - _stext_l2);
 200         free_l2_sram_head.next->size =
 201                 L2_LENGTH - (_ebss_l2 - _stext_l2);
 202         free_l2_sram_head.next->pid = 0;
 203         free_l2_sram_head.next->next = NULL;
 204
 205         used_l2_sram_head.next = NULL;
 206
 207         printk(KERN_INFO "Blackfin L2 SRAM: %d KB (%d KB free)\n",
 208                 L2_LENGTH >> 10,
 209                 free_l2_sram_head.next->size >> 10);
 210
 211         /* mutex initialize */
 212         spin_lock_init(&l2_sram_lock);
 213 #endif
 214 }
 215
 216 static int __init bfin_sram_init(void)
 217 {
 218         sram_piece_cache = kmem_cache_create("sram_piece_cache",
 219                                 sizeof(struct sram_piece),
 220                                 0, SLAB_PANIC, NULL);
 221
 222         l1sram_init();
 223         l1_data_sram_init();
 224         l1_inst_sram_init();
 225         l2_sram_init();
 226
 227         return 0;
 228 }
 229 pure_initcall(bfin_sram_init);
 230
 231 /* SRAM allocate function */
 232 static void *_sram_alloc(size_t size, struct sram_piece *pfree_head,
 233                 struct sram_piece *pused_head)
 234 {
 235         struct sram_piece *pslot, *plast, *pavail;
 236
 237         if (size <= 0 || !pfree_head || !pused_head)
 238                 return NULL;
 239
 240         /* Align the size */
 241         size = (size + 3) & ~3;
 242
 243         pslot = pfree_head->next;
 244         plast = pfree_head;
 245
 246         /* search an available piece slot */
 247         while (pslot != NULL && size > pslot->size) {
 248                 plast = pslot;
 249                 pslot = pslot->next;
 250         }
 251
 252         if (!pslot)
 253                 return NULL;
 254
 255         if (pslot->size == size) {
 256                 plast->next = pslot->next;
 257                 pavail = pslot;
 258         } else {
 259                 /* use atomic so our L1 allocator can be used atomically */
 260                 pavail = kmem_cache_alloc(sram_piece_cache, GFP_ATOMIC);
 261
 262                 if (!pavail)
 263                         return NULL;
 264
 265                 pavail->paddr = pslot->paddr;
 266                 pavail->size = size;
 267                 pslot->paddr += size;
 268                 pslot->size -= size;
 269         }
 270
 271         pavail->pid = current->pid;
 272
 273         pslot = pused_head->next;
 274         plast = pused_head;
 275
 276         /* insert new piece into used piece list !!! */
 277         while (pslot != NULL && pavail->paddr < pslot->paddr) {
 278                 plast = pslot;
 279                 pslot = pslot->next;
 280         }
 281
 282         pavail->next = pslot;
 283         plast->next = pavail;
 284
 285         return pavail->paddr;
 286 }
 287
 288 /* Allocate the largest available block.  */
 289 static void *_sram_alloc_max(struct sram_piece *pfree_head,
 290                                 struct sram_piece *pused_head,
 291                                 unsigned long *psize)
 292 {
 293         struct sram_piece *pslot, *pmax;
 294
 295         if (!pfree_head || !pused_head)
 296                 return NULL;
 297
 298         pmax = pslot = pfree_head->next;
 299
 300         /* search an available piece slot */
 301         while (pslot != NULL) {
 302                 if (pslot->size > pmax->size)
 303                         pmax = pslot;
 304                 pslot = pslot->next;
 305         }
 306
 307         if (!pmax)
 308                 return NULL;
 309
 310         *psize = pmax->size;
 311
 312         return _sram_alloc(*psize, pfree_head, pused_head);
 313 }
 314
 315 /* SRAM free function */
 316 static int _sram_free(const void *addr,
 317                         struct sram_piece *pfree_head,
 318                         struct sram_piece *pused_head)
 319 {
 320         struct sram_piece *pslot, *plast, *pavail;
 321
 322         if (!pfree_head || !pused_head)
 323                 return -1;
 324
 325         /* search the relevant memory slot */
 326         pslot = pused_head->next;
 327         plast = pused_head;
 328
 329         /* search an available piece slot */
 330         while (pslot != NULL && pslot->paddr != addr) {
 331                 plast = pslot;
 332                 pslot = pslot->next;
 333         }
 334
 335         if (!pslot)
 336                 return -1;
 337
 338         plast->next = pslot->next;
 339         pavail = pslot;
 340         pavail->pid = 0;
 341
 342         /* insert free pieces back to the free list */
 343         pslot = pfree_head->next;
 344         plast = pfree_head;
 345
 346         while (pslot != NULL && addr > pslot->paddr) {
 347                 plast = pslot;
 348                 pslot = pslot->next;
 349         }
 350
 351         if (plast != pfree_head && plast->paddr + plast->size == pavail->paddr) {
 352                 plast->size += pavail->size;
 353                 kmem_cache_free(sram_piece_cache, pavail);
 354         } else {
 355                 pavail->next = plast->next;
 356                 plast->next = pavail;
 357                 plast = pavail;
 358         }
 359
 360         if (pslot && plast->paddr + plast->size == pslot->paddr) {
 361                 plast->size += pslot->size;
 362                 plast->next = pslot->next;
 363                 kmem_cache_free(sram_piece_cache, pslot);
 364         }
 365
 366         return 0;
 367 }
 368
 369 int sram_free(const void *addr)
 370 {
 371
 372 #if L1_CODE_LENGTH != 0
 373         if (addr >= (void *)get_l1_code_start()
 374                  && addr < (void *)(get_l1_code_start() + L1_CODE_LENGTH))
 375                 return l1_inst_sram_free(addr);
 376         else
 377 #endif
 378 #if L1_DATA_A_LENGTH != 0
 379         if (addr >= (void *)get_l1_data_a_start()
 380                  && addr < (void *)(get_l1_data_a_start() + L1_DATA_A_LENGTH))
 381                 return l1_data_A_sram_free(addr);
 382         else
 383 #endif
 384 #if L1_DATA_B_LENGTH != 0
 385         if (addr >= (void *)get_l1_data_b_start()
 386                  && addr < (void *)(get_l1_data_b_start() + L1_DATA_B_LENGTH))
 387                 return l1_data_B_sram_free(addr);
 388         else
 389 #endif
 390 #if L2_LENGTH != 0
 391         if (addr >= (void *)L2_START
 392                  && addr < (void *)(L2_START + L2_LENGTH))
 393                 return l2_sram_free(addr);
 394         else
 395 #endif
 396                 return -1;
 397 }
 398 EXPORT_SYMBOL(sram_free);
 399
 400 void *l1_data_A_sram_alloc(size_t size)
 401 {
 402 #if L1_DATA_A_LENGTH != 0
 403         unsigned long flags;
 404         void *addr;
 405         unsigned int cpu;
 406
 407         cpu = smp_processor_id();
 408         /* add mutex operation */
 409         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 410
 411         addr = _sram_alloc(size, &per_cpu(free_l1_data_A_sram_head, cpu),
 412                         &per_cpu(used_l1_data_A_sram_head, cpu));
 413
 414         /* add mutex operation */
 415         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 416
 417         pr_debug("Allocated address in l1_data_A_sram_alloc is 0x%lx+0x%lx\n",
 418                  (long unsigned int)addr, size);
 419
 420         return addr;
 421 #else
 422         return NULL;
 423 #endif
 424 }
 425 EXPORT_SYMBOL(l1_data_A_sram_alloc);
 426
 427 int l1_data_A_sram_free(const void *addr)
 428 {
 429 #if L1_DATA_A_LENGTH != 0
 430         unsigned long flags;
 431         int ret;
 432         unsigned int cpu;
 433
 434         cpu = smp_processor_id();
 435         /* add mutex operation */
 436         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 437
 438         ret = _sram_free(addr, &per_cpu(free_l1_data_A_sram_head, cpu),
 439                         &per_cpu(used_l1_data_A_sram_head, cpu));
 440
 441         /* add mutex operation */
 442         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 443
 444         return ret;
 445 #else
 446         return -1;
 447 #endif
 448 }
 449 EXPORT_SYMBOL(l1_data_A_sram_free);
 450
 451 void *l1_data_B_sram_alloc(size_t size)
 452 {
 453 #if L1_DATA_B_LENGTH != 0
 454         unsigned long flags;
 455         void *addr;
 456         unsigned int cpu;
 457
 458         cpu = smp_processor_id();
 459         /* add mutex operation */
 460         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 461
 462         addr = _sram_alloc(size, &per_cpu(free_l1_data_B_sram_head, cpu),
 463                         &per_cpu(used_l1_data_B_sram_head, cpu));
 464
 465         /* add mutex operation */
 466         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 467
 468         pr_debug("Allocated address in l1_data_B_sram_alloc is 0x%lx+0x%lx\n",
 469                  (long unsigned int)addr, size);
 470
 471         return addr;
 472 #else
 473         return NULL;
 474 #endif
 475 }
 476 EXPORT_SYMBOL(l1_data_B_sram_alloc);
 477
 478 int l1_data_B_sram_free(const void *addr)
 479 {
 480 #if L1_DATA_B_LENGTH != 0
 481         unsigned long flags;
 482         int ret;
 483         unsigned int cpu;
 484
 485         cpu = smp_processor_id();
 486         /* add mutex operation */
 487         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 488
 489         ret = _sram_free(addr, &per_cpu(free_l1_data_B_sram_head, cpu),
 490                         &per_cpu(used_l1_data_B_sram_head, cpu));
 491
 492         /* add mutex operation */
 493         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 494
 495         return ret;
 496 #else
 497         return -1;
 498 #endif
 499 }
 500 EXPORT_SYMBOL(l1_data_B_sram_free);
 501
 502 void *l1_data_sram_alloc(size_t size)
 503 {
 504         void *addr = l1_data_A_sram_alloc(size);
 505
 506         if (!addr)
 507                 addr = l1_data_B_sram_alloc(size);
 508
 509         return addr;
 510 }
 511 EXPORT_SYMBOL(l1_data_sram_alloc);
 512
 513 void *l1_data_sram_zalloc(size_t size)
 514 {
 515         void *addr = l1_data_sram_alloc(size);
 516
 517         if (addr)
 518                 memset(addr, 0x00, size);
 519
 520         return addr;
 521 }
 522 EXPORT_SYMBOL(l1_data_sram_zalloc);
 523
 524 int l1_data_sram_free(const void *addr)
 525 {
 526         int ret;
 527         ret = l1_data_A_sram_free(addr);
 528         if (ret == -1)
 529                 ret = l1_data_B_sram_free(addr);
 530         return ret;
 531 }
 532 EXPORT_SYMBOL(l1_data_sram_free);
 533
 534 void *l1_inst_sram_alloc(size_t size)
 535 {
 536 #if L1_CODE_LENGTH != 0
 537         unsigned long flags;
 538         void *addr;
 539         unsigned int cpu;
 540
 541         cpu = smp_processor_id();
 542         /* add mutex operation */
 543         spin_lock_irqsave(&per_cpu(l1_inst_sram_lock, cpu), flags);
 544
 545         addr = _sram_alloc(size, &per_cpu(free_l1_inst_sram_head, cpu),
 546                         &per_cpu(used_l1_inst_sram_head, cpu));
 547
 548         /* add mutex operation */
 549         spin_unlock_irqrestore(&per_cpu(l1_inst_sram_lock, cpu), flags);
 550
 551         pr_debug("Allocated address in l1_inst_sram_alloc is 0x%lx+0x%lx\n",
 552                  (long unsigned int)addr, size);
 553
 554         return addr;
 555 #else
 556         return NULL;
 557 #endif
 558 }
 559 EXPORT_SYMBOL(l1_inst_sram_alloc);
 560
 561 int l1_inst_sram_free(const void *addr)
 562 {
 563 #if L1_CODE_LENGTH != 0
 564         unsigned long flags;
 565         int ret;
 566         unsigned int cpu;
 567
 568         cpu = smp_processor_id();
 569         /* add mutex operation */
 570         spin_lock_irqsave(&per_cpu(l1_inst_sram_lock, cpu), flags);
 571
 572         ret = _sram_free(addr, &per_cpu(free_l1_inst_sram_head, cpu),
 573                         &per_cpu(used_l1_inst_sram_head, cpu));
 574
 575         /* add mutex operation */
 576         spin_unlock_irqrestore(&per_cpu(l1_inst_sram_lock, cpu), flags);
 577
 578         return ret;
 579 #else
 580         return -1;
 581 #endif
 582 }
 583 EXPORT_SYMBOL(l1_inst_sram_free);
 584
 585 /* L1 Scratchpad memory allocate function */
 586 void *l1sram_alloc(size_t size)
 587 {
 588         unsigned long flags;
 589         void *addr;
 590         unsigned int cpu;
 591
 592         cpu = smp_processor_id();
 593         /* add mutex operation */
 594         spin_lock_irqsave(&per_cpu(l1sram_lock, cpu), flags);
 595
 596         addr = _sram_alloc(size, &per_cpu(free_l1_ssram_head, cpu),
 597                         &per_cpu(used_l1_ssram_head, cpu));
 598
 599         /* add mutex operation */
 600         spin_unlock_irqrestore(&per_cpu(l1sram_lock, cpu), flags);
 601
 602         return addr;
 603 }
 604
 605 /* L1 Scratchpad memory allocate function */
 606 void *l1sram_alloc_max(size_t *psize)
 607 {
 608         unsigned long flags;
 609         void *addr;
 610         unsigned int cpu;
 611
 612         cpu = smp_processor_id();
 613         /* add mutex operation */
 614         spin_lock_irqsave(&per_cpu(l1sram_lock, cpu), flags);
 615
 616         addr = _sram_alloc_max(&per_cpu(free_l1_ssram_head, cpu),
 617                         &per_cpu(used_l1_ssram_head, cpu), psize);
 618
 619         /* add mutex operation */
 620         spin_unlock_irqrestore(&per_cpu(l1sram_lock, cpu), flags);
 621
 622         return addr;
 623 }
 624
 625 /* L1 Scratchpad memory free function */
 626 int l1sram_free(const void *addr)
 627 {
 628         unsigned long flags;
 629         int ret;
 630         unsigned int cpu;
 631
 632         cpu = smp_processor_id();
 633         /* add mutex operation */
 634         spin_lock_irqsave(&per_cpu(l1sram_lock, cpu), flags);
 635
 636         ret = _sram_free(addr, &per_cpu(free_l1_ssram_head, cpu),
 637                         &per_cpu(used_l1_ssram_head, cpu));
 638
 639         /* add mutex operation */
 640         spin_unlock_irqrestore(&per_cpu(l1sram_lock, cpu), flags);
 641
 642         return ret;
 643 }
 644
 645 void *l2_sram_alloc(size_t size)
 646 {
 647 #if L2_LENGTH != 0
 648         unsigned long flags;
 649         void *addr;
 650
 651         /* add mutex operation */
 652         spin_lock_irqsave(&l2_sram_lock, flags);
 653
 654         addr = _sram_alloc(size, &free_l2_sram_head,
 655                         &used_l2_sram_head);
 656
 657         /* add mutex operation */
 658         spin_unlock_irqrestore(&l2_sram_lock, flags);
 659
 660         pr_debug("Allocated address in l2_sram_alloc is 0x%lx+0x%lx\n",
 661                  (long unsigned int)addr, size);
 662
 663         return addr;
 664 #else
 665         return NULL;
 666 #endif
 667 }
 668 EXPORT_SYMBOL(l2_sram_alloc);
 669
 670 void *l2_sram_zalloc(size_t size)
 671 {
 672         void *addr = l2_sram_alloc(size);
 673
 674         if (addr)
 675                 memset(addr, 0x00, size);
 676
 677         return addr;
 678 }
 679 EXPORT_SYMBOL(l2_sram_zalloc);
 680
 681 int l2_sram_free(const void *addr)
 682 {
 683 #if L2_LENGTH != 0
 684         unsigned long flags;
 685         int ret;
 686
 687         /* add mutex operation */
 688         spin_lock_irqsave(&l2_sram_lock, flags);
 689
 690         ret = _sram_free(addr, &free_l2_sram_head,
 691                         &used_l2_sram_head);
 692
 693         /* add mutex operation */
 694         spin_unlock_irqrestore(&l2_sram_lock, flags);
 695
 696         return ret;
 697 #else
 698         return -1;
 699 #endif
 700 }
 701 EXPORT_SYMBOL(l2_sram_free);
 702
 703 int sram_free_with_lsl(const void *addr)
 704 {
 705         struct sram_list_struct *lsl, **tmp;
 706         struct mm_struct *mm = current->mm;
 707         int ret = -1;
 708
 709         for (tmp = &mm->context.sram_list; *tmp; tmp = &(*tmp)->next)
 710                 if ((*tmp)->addr == addr) {
 711                         lsl = *tmp;
 712                         ret = sram_free(addr);
 713                         *tmp = lsl->next;
 714                         kfree(lsl);
 715                         break;
 716                 }
 717
 718         return ret;
 719 }
 720 EXPORT_SYMBOL(sram_free_with_lsl);
 721
 722 /* Allocate memory and keep in L1 SRAM List (lsl) so that the resources are
 723  * tracked.  These are designed for userspace so that when a process exits,
 724  * we can safely reap their resources.
 725  */
 726 void *sram_alloc_with_lsl(size_t size, unsigned long flags)
 727 {
 728         void *addr = NULL;
 729         struct sram_list_struct *lsl = NULL;
 730         struct mm_struct *mm = current->mm;
 731
 732         lsl = kzalloc(sizeof(struct sram_list_struct), GFP_KERNEL);
 733         if (!lsl)
 734                 return NULL;
 735
 736         if (flags & L1_INST_SRAM)
 737                 addr = l1_inst_sram_alloc(size);
 738
 739         if (addr == NULL && (flags & L1_DATA_A_SRAM))
 740                 addr = l1_data_A_sram_alloc(size);
 741
 742         if (addr == NULL && (flags & L1_DATA_B_SRAM))
 743                 addr = l1_data_B_sram_alloc(size);
 744
 745         if (addr == NULL && (flags & L2_SRAM))
 746                 addr = l2_sram_alloc(size);
 747
 748         if (addr == NULL) {
 749                 kfree(lsl);
 750                 return NULL;
 751         }
 752         lsl->addr = addr;
 753         lsl->length = size;
 754         lsl->next = mm->context.sram_list;
 755         mm->context.sram_list = lsl;
 756         return addr;
 757 }
 758 EXPORT_SYMBOL(sram_alloc_with_lsl);
 759
 760 #ifdef CONFIG_PROC_FS
 761 /* Once we get a real allocator, we'll throw all of this away.
 762  * Until then, we need some sort of visibility into the L1 alloc.
 763  */
 764 /* Need to keep line of output the same.  Currently, that is 44 bytes
 765  * (including newline).
 766  */
 767 static int _sram_proc_read(char *buf, int *len, int count, const char *desc,
 768                 struct sram_piece *pfree_head,
 769                 struct sram_piece *pused_head)
 770 {
 771         struct sram_piece *pslot;
 772
 773         if (!pfree_head || !pused_head)
 774                 return -1;
 775
 776         *len += sprintf(&buf[*len], "--- SRAM %-14s Size   PID State     \n", desc);
 777
 778         /* search the relevant memory slot */
 779         pslot = pused_head->next;
 780
 781         while (pslot != NULL) {
 782                 *len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
 783                         pslot->paddr, pslot->paddr + pslot->size,
 784                         pslot->size, pslot->pid, "ALLOCATED");
 785
 786                 pslot = pslot->next;
 787         }
 788
 789         pslot = pfree_head->next;
 790
 791         while (pslot != NULL) {
 792                 *len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
 793                         pslot->paddr, pslot->paddr + pslot->size,
 794                         pslot->size, pslot->pid, "FREE");
 795
 796                 pslot = pslot->next;
 797         }
 798
 799         return 0;
 800 }
 801 static int sram_proc_read(char *buf, char **start, off_t offset, int count,
 802                 int *eof, void *data)
 803 {
 804         int len = 0;
 805         unsigned int cpu;
 806
 807         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
 808                 if (_sram_proc_read(buf, &len, count, "Scratchpad",
 809                         &per_cpu(free_l1_ssram_head, cpu), &per_cpu(used_l1_ssram_head, cpu)))
 810                         goto not_done;
 811 #if L1_DATA_A_LENGTH != 0
 812                 if (_sram_proc_read(buf, &len, count, "L1 Data A",
 813                         &per_cpu(free_l1_data_A_sram_head, cpu),
 814                         &per_cpu(used_l1_data_A_sram_head, cpu)))
 815                         goto not_done;
 816 #endif
 817 #if L1_DATA_B_LENGTH != 0
 818                 if (_sram_proc_read(buf, &len, count, "L1 Data B",
 819                         &per_cpu(free_l1_data_B_sram_head, cpu),
 820                         &per_cpu(used_l1_data_B_sram_head, cpu)))
 821                         goto not_done;
 822 #endif
 823 #if L1_CODE_LENGTH != 0
 824                 if (_sram_proc_read(buf, &len, count, "L1 Instruction",
 825                         &per_cpu(free_l1_inst_sram_head, cpu),
 826                         &per_cpu(used_l1_inst_sram_head, cpu)))
 827                         goto not_done;
 828 #endif
 829         }
 830 #if L2_LENGTH != 0
 831         if (_sram_proc_read(buf, &len, count, "L2", &free_l2_sram_head,
 832                 &used_l2_sram_head))
 833                 goto not_done;
 834 #endif
 835         *eof = 1;
 836  not_done:
 837         return len;
 838 }
 839
 840 static int __init sram_proc_init(void)
 841 {
 842         struct proc_dir_entry *ptr;
 843         ptr = create_proc_entry("sram", S_IFREG | S_IRUGO, NULL);
 844         if (!ptr) {
 845                 printk(KERN_WARNING "unable to create /proc/sram\n");
 846                 return -1;
 847         }
 848         ptr->read_proc = sram_proc_read;
 849         return 0;
 850 }
 851 late_initcall(sram_proc_init);
 852 #endif