arch/powerpc/kernel/prom.c

   1 /*
   2  * Procedures for creating, accessing and interpreting the device tree.
   3  *
   4  * Paul Mackerras       August 1996.
   5  * Copyright (C) 1996-2005 Paul Mackerras.
   6  *
   7  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
   8  *    {engebret|bergner}@us.ibm.com
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 #undef DEBUG
  17
  18 #include <stdarg.h>
  19 #include <linux/kernel.h>
  20 #include <linux/string.h>
  21 #include <linux/init.h>
  22 #include <linux/threads.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/types.h>
  25 #include <linux/pci.h>
  26 #include <linux/stringify.h>
  27 #include <linux/delay.h>
  28 #include <linux/initrd.h>
  29 #include <linux/bitops.h>
  30 #include <linux/export.h>
  31 #include <linux/kexec.h>
  32 #include <linux/irq.h>
  33 #include <linux/memblock.h>
  34 #include <linux/of.h>
  35 #include <linux/of_fdt.h>
  36 #include <linux/libfdt.h>
  37 #include <linux/cpu.h>
  38
  39 #include <asm/prom.h>
  40 #include <asm/rtas.h>
  41 #include <asm/page.h>
  42 #include <asm/processor.h>
  43 #include <asm/irq.h>
  44 #include <asm/io.h>
  45 #include <asm/kdump.h>
  46 #include <asm/smp.h>
  47 #include <asm/mmu.h>
  48 #include <asm/paca.h>
  49 #include <asm/pgtable.h>
  50 #include <asm/powernv.h>
  51 #include <asm/iommu.h>
  52 #include <asm/btext.h>
  53 #include <asm/sections.h>
  54 #include <asm/machdep.h>
  55 #include <asm/pci-bridge.h>
  56 #include <asm/kexec.h>
  57 #include <asm/opal.h>
  58 #include <asm/fadump.h>
  59 #include <asm/epapr_hcalls.h>
  60 #include <asm/firmware.h>
  61 #include <asm/dt_cpu_ftrs.h>
  62
  63 #include <mm/mmu_decl.h>
  64
  65 #ifdef DEBUG
  66 #define DBG(fmt...) printk(KERN_ERR fmt)
  67 #else
  68 #define DBG(fmt...)
  69 #endif
  70
  71 #ifdef CONFIG_PPC64
  72 int __initdata iommu_is_off;
  73 int __initdata iommu_force_on;
  74 unsigned long tce_alloc_start, tce_alloc_end;
  75 u64 ppc64_rma_size;
  76 #endif
  77 static phys_addr_t first_memblock_size;
  78 static int __initdata boot_cpu_count;
  79
  80 static int __init early_parse_mem(char *p)
  81 {
  82         if (!p)
  83                 return 1;
  84
  85         memory_limit = PAGE_ALIGN(memparse(p, &p));
  86         DBG("memory limit = 0x%llx\n", memory_limit);
  87
  88         return 0;
  89 }
  90 early_param("mem", early_parse_mem);
  91
  92 /*
  93  * overlaps_initrd - check for overlap with page aligned extension of
  94  * initrd.
  95  */
  96 static inline int overlaps_initrd(unsigned long start, unsigned long size)
  97 {
  98 #ifdef CONFIG_BLK_DEV_INITRD
  99         if (!initrd_start)
 100                 return 0;
 101
 102         return  (start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) &&
 103                         start <= _ALIGN_UP(initrd_end, PAGE_SIZE);
 104 #else
 105         return 0;
 106 #endif
 107 }
 108
 109 /**
 110  * move_device_tree - move tree to an unused area, if needed.
 111  *
 112  * The device tree may be allocated beyond our memory limit, or inside the
 113  * crash kernel region for kdump, or within the page aligned range of initrd.
 114  * If so, move it out of the way.
 115  */
 116 static void __init move_device_tree(void)
 117 {
 118         unsigned long start, size;
 119         void *p;
 120
 121         DBG("-> move_device_tree\n");
 122
 123         start = __pa(initial_boot_params);
 124         size = fdt_totalsize(initial_boot_params);
 125
 126         if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
 127                         overlaps_crashkernel(start, size) ||
 128                         overlaps_initrd(start, size)) {
 129                 p = __va(memblock_alloc(size, PAGE_SIZE));
 130                 memcpy(p, initial_boot_params, size);
 131                 initial_boot_params = p;
 132                 DBG("Moved device tree to 0x%p\n", p);
 133         }
 134
 135         DBG("<- move_device_tree\n");
 136 }
 137
 138 /*
 139  * ibm,pa-features is a per-cpu property that contains a string of
 140  * attribute descriptors, each of which has a 2 byte header plus up
 141  * to 254 bytes worth of processor attribute bits.  First header
 142  * byte specifies the number of bytes following the header.
 143  * Second header byte is an "attribute-specifier" type, of which
 144  * zero is the only currently-defined value.
 145  * Implementation:  Pass in the byte and bit offset for the feature
 146  * that we are interested in.  The function will return -1 if the
 147  * pa-features property is missing, or a 1/0 to indicate if the feature
 148  * is supported/not supported.  Note that the bit numbers are
 149  * big-endian to match the definition in PAPR.
 150  */
 151 static struct ibm_pa_feature {
 152         unsigned long   cpu_features;   /* CPU_FTR_xxx bit */
 153         unsigned long   mmu_features;   /* MMU_FTR_xxx bit */
 154         unsigned int    cpu_user_ftrs;  /* PPC_FEATURE_xxx bit */
 155         unsigned int    cpu_user_ftrs2; /* PPC_FEATURE2_xxx bit */
 156         unsigned char   pabyte;         /* byte number in ibm,pa-features */
 157         unsigned char   pabit;          /* bit number (big-endian) */
 158         unsigned char   invert;         /* if 1, pa bit set => clear feature */
 159 } ibm_pa_features[] __initdata = {
 160         { .pabyte = 0,  .pabit = 0, .cpu_user_ftrs = PPC_FEATURE_HAS_MMU },
 161         { .pabyte = 0,  .pabit = 1, .cpu_user_ftrs = PPC_FEATURE_HAS_FPU },
 162         { .pabyte = 0,  .pabit = 3, .cpu_features  = CPU_FTR_CTRL },
 163         { .pabyte = 0,  .pabit = 6, .cpu_features  = CPU_FTR_NOEXECUTE },
 164         { .pabyte = 1,  .pabit = 2, .mmu_features  = MMU_FTR_CI_LARGE_PAGE },
 165 #ifdef CONFIG_PPC_RADIX_MMU
 166         { .pabyte = 40, .pabit = 0, .mmu_features  = MMU_FTR_TYPE_RADIX },
 167 #endif
 168         { .pabyte = 1,  .pabit = 1, .invert = 1, .cpu_features = CPU_FTR_NODSISRALIGN },
 169         { .pabyte = 5,  .pabit = 0, .cpu_features  = CPU_FTR_REAL_LE,
 170                                     .cpu_user_ftrs = PPC_FEATURE_TRUE_LE },
 171         /*
 172          * If the kernel doesn't support TM (ie CONFIG_PPC_TRANSACTIONAL_MEM=n),
 173          * we don't want to turn on TM here, so we use the *_COMP versions
 174          * which are 0 if the kernel doesn't support TM.
 175          */
 176         { .pabyte = 22, .pabit = 0, .cpu_features = CPU_FTR_TM_COMP,
 177           .cpu_user_ftrs2 = PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_HTM_NOSC_COMP },
 178 };
 179
 180 static void __init scan_features(unsigned long node, const unsigned char *ftrs,
 181                                  unsigned long tablelen,
 182                                  struct ibm_pa_feature *fp,
 183                                  unsigned long ft_size)
 184 {
 185         unsigned long i, len, bit;
 186
 187         /* find descriptor with type == 0 */
 188         for (;;) {
 189                 if (tablelen < 3)
 190                         return;
 191                 len = 2 + ftrs[0];
 192                 if (tablelen < len)
 193                         return;         /* descriptor 0 not found */
 194                 if (ftrs[1] == 0)
 195                         break;
 196                 tablelen -= len;
 197                 ftrs += len;
 198         }
 199
 200         /* loop over bits we know about */
 201         for (i = 0; i < ft_size; ++i, ++fp) {
 202                 if (fp->pabyte >= ftrs[0])
 203                         continue;
 204                 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
 205                 if (bit ^ fp->invert) {
 206                         cur_cpu_spec->cpu_features |= fp->cpu_features;
 207                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
 208                         cur_cpu_spec->cpu_user_features2 |= fp->cpu_user_ftrs2;
 209                         cur_cpu_spec->mmu_features |= fp->mmu_features;
 210                 } else {
 211                         cur_cpu_spec->cpu_features &= ~fp->cpu_features;
 212                         cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
 213                         cur_cpu_spec->cpu_user_features2 &= ~fp->cpu_user_ftrs2;
 214                         cur_cpu_spec->mmu_features &= ~fp->mmu_features;
 215                 }
 216         }
 217 }
 218
 219 static void __init check_cpu_pa_features(unsigned long node)
 220 {
 221         const unsigned char *pa_ftrs;
 222         int tablelen;
 223
 224         pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
 225         if (pa_ftrs == NULL)
 226                 return;
 227
 228         scan_features(node, pa_ftrs, tablelen,
 229                       ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
 230 }
 231
 232 #ifdef CONFIG_PPC_BOOK3S_64
 233 static void __init init_mmu_slb_size(unsigned long node)
 234 {
 235         const __be32 *slb_size_ptr;
 236
 237         slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? :
 238                         of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
 239
 240         if (slb_size_ptr)
 241                 mmu_slb_size = be32_to_cpup(slb_size_ptr);
 242 }
 243 #else
 244 #define init_mmu_slb_size(node) do { } while(0)
 245 #endif
 246
 247 static struct feature_property {
 248         const char *name;
 249         u32 min_value;
 250         unsigned long cpu_feature;
 251         unsigned long cpu_user_ftr;
 252 } feature_properties[] __initdata = {
 253 #ifdef CONFIG_ALTIVEC
 254         {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
 255         {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
 256 #endif /* CONFIG_ALTIVEC */
 257 #ifdef CONFIG_VSX
 258         /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
 259         {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
 260 #endif /* CONFIG_VSX */
 261 #ifdef CONFIG_PPC64
 262         {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
 263         {"ibm,purr", 1, CPU_FTR_PURR, 0},
 264         {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
 265 #endif /* CONFIG_PPC64 */
 266 };
 267
 268 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
 269 static inline void identical_pvr_fixup(unsigned long node)
 270 {
 271         unsigned int pvr;
 272         const char *model = of_get_flat_dt_prop(node, "model", NULL);
 273
 274         /*
 275          * Since 440GR(x)/440EP(x) processors have the same pvr,
 276          * we check the node path and set bit 28 in the cur_cpu_spec
 277          * pvr for EP(x) processor version. This bit is always 0 in
 278          * the "real" pvr. Then we call identify_cpu again with
 279          * the new logical pvr to enable FPU support.
 280          */
 281         if (model && strstr(model, "440EP")) {
 282                 pvr = cur_cpu_spec->pvr_value | 0x8;
 283                 identify_cpu(0, pvr);
 284                 DBG("Using logical pvr %x for %s\n", pvr, model);
 285         }
 286 }
 287 #else
 288 #define identical_pvr_fixup(node) do { } while(0)
 289 #endif
 290
 291 static void __init check_cpu_feature_properties(unsigned long node)
 292 {
 293         unsigned long i;
 294         struct feature_property *fp = feature_properties;
 295         const __be32 *prop;
 296
 297         for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
 298                 prop = of_get_flat_dt_prop(node, fp->name, NULL);
 299                 if (prop && be32_to_cpup(prop) >= fp->min_value) {
 300                         cur_cpu_spec->cpu_features |= fp->cpu_feature;
 301                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
 302                 }
 303         }
 304 }
 305
 306 static int __init early_init_dt_scan_cpus(unsigned long node,
 307                                           const char *uname, int depth,
 308                                           void *data)
 309 {
 310         const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 311         const __be32 *prop;
 312         const __be32 *intserv;
 313         int i, nthreads;
 314         int len;
 315         int found = -1;
 316         int found_thread = 0;
 317
 318         /* We are scanning "cpu" nodes only */
 319         if (type == NULL || strcmp(type, "cpu") != 0)
 320                 return 0;
 321
 322         /* Get physical cpuid */
 323         intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
 324         if (!intserv)
 325                 intserv = of_get_flat_dt_prop(node, "reg", &len);
 326
 327         nthreads = len / sizeof(int);
 328
 329         /*
 330          * Now see if any of these threads match our boot cpu.
 331          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
 332          */
 333         for (i = 0; i < nthreads; i++) {
 334                 /*
 335                  * version 2 of the kexec param format adds the phys cpuid of
 336                  * booted proc.
 337                  */
 338                 if (fdt_version(initial_boot_params) >= 2) {
 339                         if (be32_to_cpu(intserv[i]) ==
 340                             fdt_boot_cpuid_phys(initial_boot_params)) {
 341                                 found = boot_cpu_count;
 342                                 found_thread = i;
 343                         }
 344                 } else {
 345                         /*
 346                          * Check if it's the boot-cpu, set it's hw index now,
 347                          * unfortunately this format did not support booting
 348                          * off secondary threads.
 349                          */
 350                         if (of_get_flat_dt_prop(node,
 351                                         "linux,boot-cpu", NULL) != NULL)
 352                                 found = boot_cpu_count;
 353                 }
 354 #ifdef CONFIG_SMP
 355                 /* logical cpu id is always 0 on UP kernels */
 356                 boot_cpu_count++;
 357 #endif
 358         }
 359
 360         /* Not the boot CPU */
 361         if (found < 0)
 362                 return 0;
 363
 364         DBG("boot cpu: logical %d physical %d\n", found,
 365             be32_to_cpu(intserv[found_thread]));
 366         boot_cpuid = found;
 367         set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
 368
 369         /*
 370          * PAPR defines "logical" PVR values for cpus that
 371          * meet various levels of the architecture:
 372          * 0x0f000001   Architecture version 2.04
 373          * 0x0f000002   Architecture version 2.05
 374          * If the cpu-version property in the cpu node contains
 375          * such a value, we call identify_cpu again with the
 376          * logical PVR value in order to use the cpu feature
 377          * bits appropriate for the architecture level.
 378          *
 379          * A POWER6 partition in "POWER6 architected" mode
 380          * uses the 0x0f000002 PVR value; in POWER5+ mode
 381          * it uses 0x0f000001.
 382          *
 383          * If we're using device tree CPU feature discovery then we don't
 384          * support the cpu-version property, and it's the responsibility of the
 385          * firmware/hypervisor to provide the correct feature set for the
 386          * architecture level via the ibm,powerpc-cpu-features binding.
 387          */
 388         if (!dt_cpu_ftrs_in_use()) {
 389                 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
 390                 if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
 391                         identify_cpu(0, be32_to_cpup(prop));
 392
 393                 check_cpu_feature_properties(node);
 394                 check_cpu_pa_features(node);
 395         }
 396
 397         identical_pvr_fixup(node);
 398         init_mmu_slb_size(node);
 399
 400 #ifdef CONFIG_PPC64
 401         if (nthreads == 1)
 402                 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
 403         else if (!dt_cpu_ftrs_in_use())
 404                 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
 405 #endif
 406
 407         return 0;
 408 }
 409
 410 static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
 411                                                 const char *uname,
 412                                                 int depth, void *data)
 413 {
 414         const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
 415
 416         /* Use common scan routine to determine if this is the chosen node */
 417         if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
 418                 return 0;
 419
 420 #ifdef CONFIG_PPC64
 421         /* check if iommu is forced on or off */
 422         if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
 423                 iommu_is_off = 1;
 424         if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
 425                 iommu_force_on = 1;
 426 #endif
 427
 428         /* mem=x on the command line is the preferred mechanism */
 429         lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
 430         if (lprop)
 431                 memory_limit = *lprop;
 432
 433 #ifdef CONFIG_PPC64
 434         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
 435         if (lprop)
 436                 tce_alloc_start = *lprop;
 437         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
 438         if (lprop)
 439                 tce_alloc_end = *lprop;
 440 #endif
 441
 442 #ifdef CONFIG_KEXEC_CORE
 443         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
 444         if (lprop)
 445                 crashk_res.start = *lprop;
 446
 447         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
 448         if (lprop)
 449                 crashk_res.end = crashk_res.start + *lprop - 1;
 450 #endif
 451
 452         /* break now */
 453         return 1;
 454 }
 455
 456 #ifdef CONFIG_PPC_PSERIES
 457 /*
 458  * Interpret the ibm,dynamic-memory property in the
 459  * /ibm,dynamic-reconfiguration-memory node.
 460  * This contains a list of memory blocks along with NUMA affinity
 461  * information.
 462  */
 463 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
 464 {
 465         const __be32 *dm, *ls, *usm;
 466         int l;
 467         unsigned long n, flags;
 468         u64 base, size, memblock_size;
 469         unsigned int is_kexec_kdump = 0, rngs;
 470
 471         ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
 472         if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
 473                 return 0;
 474         memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
 475
 476         dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
 477         if (dm == NULL || l < sizeof(__be32))
 478                 return 0;
 479
 480         n = of_read_number(dm++, 1);    /* number of entries */
 481         if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
 482                 return 0;
 483
 484         /* check if this is a kexec/kdump kernel. */
 485         usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
 486                                                  &l);
 487         if (usm != NULL)
 488                 is_kexec_kdump = 1;
 489
 490         for (; n != 0; --n) {
 491                 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
 492                 flags = of_read_number(&dm[3], 1);
 493                 /* skip DRC index, pad, assoc. list index, flags */
 494                 dm += 4;
 495                 /* skip this block if the reserved bit is set in flags
 496                    or if the block is not assigned to this partition */
 497                 if ((flags & DRCONF_MEM_RESERVED) ||
 498                                 !(flags & DRCONF_MEM_ASSIGNED))
 499                         continue;
 500                 size = memblock_size;
 501                 rngs = 1;
 502                 if (is_kexec_kdump) {
 503                         /*
 504                          * For each memblock in ibm,dynamic-memory, a corresponding
 505                          * entry in linux,drconf-usable-memory property contains
 506                          * a counter 'p' followed by 'p' (base, size) duple.
 507                          * Now read the counter from
 508                          * linux,drconf-usable-memory property
 509                          */
 510                         rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
 511                         if (!rngs) /* there are no (base, size) duple */
 512                                 continue;
 513                 }
 514                 do {
 515                         if (is_kexec_kdump) {
 516                                 base = dt_mem_next_cell(dt_root_addr_cells,
 517                                                          &usm);
 518                                 size = dt_mem_next_cell(dt_root_size_cells,
 519                                                          &usm);
 520                         }
 521                         if (iommu_is_off) {
 522                                 if (base >= 0x80000000ul)
 523                                         continue;
 524                                 if ((base + size) > 0x80000000ul)
 525                                         size = 0x80000000ul - base;
 526                         }
 527                         memblock_add(base, size);
 528                 } while (--rngs);
 529         }
 530         memblock_dump_all();
 531         return 0;
 532 }
 533 #else
 534 #define early_init_dt_scan_drconf_memory(node)  0
 535 #endif /* CONFIG_PPC_PSERIES */
 536
 537 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
 538                                                 const char *uname,
 539                                                 int depth, void *data)
 540 {
 541         if (depth == 1 &&
 542             strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
 543                 return early_init_dt_scan_drconf_memory(node);
 544
 545         return early_init_dt_scan_memory(node, uname, depth, data);
 546 }
 547
 548 /*
 549  * For a relocatable kernel, we need to get the memstart_addr first,
 550  * then use it to calculate the virtual kernel start address. This has
 551  * to happen at a very early stage (before machine_init). In this case,
 552  * we just want to get the memstart_address and would not like to mess the
 553  * memblock at this stage. So introduce a variable to skip the memblock_add()
 554  * for this reason.
 555  */
 556 #ifdef CONFIG_RELOCATABLE
 557 static int add_mem_to_memblock = 1;
 558 #else
 559 #define add_mem_to_memblock 1
 560 #endif
 561
 562 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 563 {
 564 #ifdef CONFIG_PPC64
 565         if (iommu_is_off) {
 566                 if (base >= 0x80000000ul)
 567                         return;
 568                 if ((base + size) > 0x80000000ul)
 569                         size = 0x80000000ul - base;
 570         }
 571 #endif
 572         /* Keep track of the beginning of memory -and- the size of
 573          * the very first block in the device-tree as it represents
 574          * the RMA on ppc64 server
 575          */
 576         if (base < memstart_addr) {
 577                 memstart_addr = base;
 578                 first_memblock_size = size;
 579         }
 580
 581         /* Add the chunk to the MEMBLOCK list */
 582         if (add_mem_to_memblock)
 583                 memblock_add(base, size);
 584 }
 585
 586 static void __init early_reserve_mem_dt(void)
 587 {
 588         unsigned long i, dt_root;
 589         int len;
 590         const __be32 *prop;
 591
 592         early_init_fdt_reserve_self();
 593         early_init_fdt_scan_reserved_mem();
 594
 595         dt_root = of_get_flat_dt_root();
 596
 597         prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
 598
 599         if (!prop)
 600                 return;
 601
 602         DBG("Found new-style reserved-ranges\n");
 603
 604         /* Each reserved range is an (address,size) pair, 2 cells each,
 605          * totalling 4 cells per range. */
 606         for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
 607                 u64 base, size;
 608
 609                 base = of_read_number(prop + (i * 4) + 0, 2);
 610                 size = of_read_number(prop + (i * 4) + 2, 2);
 611
 612                 if (size) {
 613                         DBG("reserving: %llx -> %llx\n", base, size);
 614                         memblock_reserve(base, size);
 615                 }
 616         }
 617 }
 618
 619 static void __init early_reserve_mem(void)
 620 {
 621         __be64 *reserve_map;
 622
 623         reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
 624                         fdt_off_mem_rsvmap(initial_boot_params));
 625
 626         /* Look for the new "reserved-regions" property in the DT */
 627         early_reserve_mem_dt();
 628
 629 #ifdef CONFIG_BLK_DEV_INITRD
 630         /* Then reserve the initrd, if any */
 631         if (initrd_start && (initrd_end > initrd_start)) {
 632                 memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
 633                         _ALIGN_UP(initrd_end, PAGE_SIZE) -
 634                         _ALIGN_DOWN(initrd_start, PAGE_SIZE));
 635         }
 636 #endif /* CONFIG_BLK_DEV_INITRD */
 637
 638 #ifdef CONFIG_PPC32
 639         /*
 640          * Handle the case where we might be booting from an old kexec
 641          * image that setup the mem_rsvmap as pairs of 32-bit values
 642          */
 643         if (be64_to_cpup(reserve_map) > 0xffffffffull) {
 644                 u32 base_32, size_32;
 645                 __be32 *reserve_map_32 = (__be32 *)reserve_map;
 646
 647                 DBG("Found old 32-bit reserve map\n");
 648
 649                 while (1) {
 650                         base_32 = be32_to_cpup(reserve_map_32++);
 651                         size_32 = be32_to_cpup(reserve_map_32++);
 652                         if (size_32 == 0)
 653                                 break;
 654                         DBG("reserving: %x -> %x\n", base_32, size_32);
 655                         memblock_reserve(base_32, size_32);
 656                 }
 657                 return;
 658         }
 659 #endif
 660 }
 661
 662 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 663 static bool tm_disabled __initdata;
 664
 665 static int __init parse_ppc_tm(char *str)
 666 {
 667         bool res;
 668
 669         if (kstrtobool(str, &res))
 670                 return -EINVAL;
 671
 672         tm_disabled = !res;
 673
 674         return 0;
 675 }
 676 early_param("ppc_tm", parse_ppc_tm);
 677
 678 static void __init tm_init(void)
 679 {
 680         if (tm_disabled) {
 681                 pr_info("Disabling hardware transactional memory (HTM)\n");
 682                 cur_cpu_spec->cpu_user_features2 &=
 683                         ~(PPC_FEATURE2_HTM_NOSC | PPC_FEATURE2_HTM);
 684                 cur_cpu_spec->cpu_features &= ~CPU_FTR_TM;
 685                 return;
 686         }
 687
 688         pnv_tm_init();
 689 }
 690 #else
 691 static void tm_init(void) { }
 692 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
 693
 694 void __init early_init_devtree(void *params)
 695 {
 696         phys_addr_t limit;
 697
 698         DBG(" -> early_init_devtree(%p)\n", params);
 699
 700         /* Too early to BUG_ON(), do it by hand */
 701         if (!early_init_dt_verify(params))
 702                 panic("BUG: Failed verifying flat device tree, bad version?");
 703
 704 #ifdef CONFIG_PPC_RTAS
 705         /* Some machines might need RTAS info for debugging, grab it now. */
 706         of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
 707 #endif
 708
 709 #ifdef CONFIG_PPC_POWERNV
 710         /* Some machines might need OPAL info for debugging, grab it now. */
 711         of_scan_flat_dt(early_init_dt_scan_opal, NULL);
 712 #endif
 713
 714 #ifdef CONFIG_FA_DUMP
 715         /* scan tree to see if dump is active during last boot */
 716         of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
 717 #endif
 718
 719         /* Retrieve various informations from the /chosen node of the
 720          * device-tree, including the platform type, initrd location and
 721          * size, TCE reserve, and more ...
 722          */
 723         of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line);
 724
 725         /* Scan memory nodes and rebuild MEMBLOCKs */
 726         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 727         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
 728
 729         parse_early_param();
 730
 731         /* make sure we've parsed cmdline for mem= before this */
 732         if (memory_limit)
 733                 first_memblock_size = min_t(u64, first_memblock_size, memory_limit);
 734         setup_initial_memory_limit(memstart_addr, first_memblock_size);
 735         /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
 736         memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
 737         /* If relocatable, reserve first 32k for interrupt vectors etc. */
 738         if (PHYSICAL_START > MEMORY_START)
 739                 memblock_reserve(MEMORY_START, 0x8000);
 740         reserve_kdump_trampoline();
 741 #ifdef CONFIG_FA_DUMP
 742         /*
 743          * If we fail to reserve memory for firmware-assisted dump then
 744          * fallback to kexec based kdump.
 745          */
 746         if (fadump_reserve_mem() == 0)
 747 #endif
 748                 reserve_crashkernel();
 749         early_reserve_mem();
 750
 751         /* Ensure that total memory size is page-aligned. */
 752         limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
 753         memblock_enforce_memory_limit(limit);
 754
 755         memblock_allow_resize();
 756         memblock_dump_all();
 757
 758         DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
 759
 760         /* We may need to relocate the flat tree, do it now.
 761          * FIXME .. and the initrd too? */
 762         move_device_tree();
 763
 764         allocate_pacas();
 765
 766         DBG("Scanning CPUs ...\n");
 767
 768         dt_cpu_ftrs_scan();
 769
 770         /* Retrieve CPU related informations from the flat tree
 771          * (altivec support, boot CPU ID, ...)
 772          */
 773         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
 774         if (boot_cpuid < 0) {
 775                 printk("Failed to identify boot CPU !\n");
 776                 BUG();
 777         }
 778
 779 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
 780         /* We'll later wait for secondaries to check in; there are
 781          * NCPUS-1 non-boot CPUs  :-)
 782          */
 783         spinning_secondaries = boot_cpu_count - 1;
 784 #endif
 785
 786         mmu_early_init_devtree();
 787
 788 #ifdef CONFIG_PPC_POWERNV
 789         /* Scan and build the list of machine check recoverable ranges */
 790         of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL);
 791 #endif
 792         epapr_paravirt_early_init();
 793
 794         /* Now try to figure out if we are running on LPAR and so on */
 795         pseries_probe_fw_features();
 796
 797 #ifdef CONFIG_PPC_PS3
 798         /* Identify PS3 firmware */
 799         if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3"))
 800                 powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE;
 801 #endif
 802
 803         tm_init();
 804
 805         DBG(" <- early_init_devtree()\n");
 806 }
 807
 808 #ifdef CONFIG_RELOCATABLE
 809 /*
 810  * This function run before early_init_devtree, so we have to init
 811  * initial_boot_params.
 812  */
 813 void __init early_get_first_memblock_info(void *params, phys_addr_t *size)
 814 {
 815         /* Setup flat device-tree pointer */
 816         initial_boot_params = params;
 817
 818         /*
 819          * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid
 820          * mess the memblock.
 821          */
 822         add_mem_to_memblock = 0;
 823         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 824         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
 825         add_mem_to_memblock = 1;
 826
 827         if (size)
 828                 *size = first_memblock_size;
 829 }
 830 #endif
 831
 832 /*******
 833  *
 834  * New implementation of the OF "find" APIs, return a refcounted
 835  * object, call of_node_put() when done.  The device tree and list
 836  * are protected by a rw_lock.
 837  *
 838  * Note that property management will need some locking as well,
 839  * this isn't dealt with yet.
 840  *
 841  *******/
 842
 843 /**
 844  * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
 845  * @np: device node of the device
 846  *
 847  * This looks for a property "ibm,chip-id" in the node or any
 848  * of its parents and returns its content, or -1 if it cannot
 849  * be found.
 850  */
 851 int of_get_ibm_chip_id(struct device_node *np)
 852 {
 853         of_node_get(np);
 854         while (np) {
 855                 u32 chip_id;
 856
 857                 /*
 858                  * Skiboot may produce memory nodes that contain more than one
 859                  * cell in chip-id, we only read the first one here.
 860                  */
 861                 if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) {
 862                         of_node_put(np);
 863                         return chip_id;
 864                 }
 865
 866                 np = of_get_next_parent(np);
 867         }
 868         return -1;
 869 }
 870 EXPORT_SYMBOL(of_get_ibm_chip_id);
 871
 872 /**
 873  * cpu_to_chip_id - Return the cpus chip-id
 874  * @cpu: The logical cpu number.
 875  *
 876  * Return the value of the ibm,chip-id property corresponding to the given
 877  * logical cpu number. If the chip-id can not be found, returns -1.
 878  */
 879 int cpu_to_chip_id(int cpu)
 880 {
 881         struct device_node *np;
 882
 883         np = of_get_cpu_node(cpu, NULL);
 884         if (!np)
 885                 return -1;
 886
 887         of_node_put(np);
 888         return of_get_ibm_chip_id(np);
 889 }
 890 EXPORT_SYMBOL(cpu_to_chip_id);
 891
 892 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
 893 {
 894         return (int)phys_id == get_hard_smp_processor_id(cpu);
 895 }