arch/powerpc/kernel/prom.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Procedures for creating, accessing and interpreting the device tree.
   4  *
   5  * Paul Mackerras       August 1996.
   6  * Copyright (C) 1996-2005 Paul Mackerras.
   7  *
   8  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
   9  *    {engebret|bergner}@us.ibm.com
  10  */
  11
  12 #undef DEBUG
  13
  14 #include <stdarg.h>
  15 #include <linux/kernel.h>
  16 #include <linux/string.h>
  17 #include <linux/init.h>
  18 #include <linux/threads.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/types.h>
  21 #include <linux/pci.h>
  22 #include <linux/delay.h>
  23 #include <linux/initrd.h>
  24 #include <linux/bitops.h>
  25 #include <linux/export.h>
  26 #include <linux/kexec.h>
  27 #include <linux/irq.h>
  28 #include <linux/memblock.h>
  29 #include <linux/of.h>
  30 #include <linux/of_fdt.h>
  31 #include <linux/libfdt.h>
  32 #include <linux/cpu.h>
  33
  34 #include <asm/prom.h>
  35 #include <asm/rtas.h>
  36 #include <asm/page.h>
  37 #include <asm/processor.h>
  38 #include <asm/irq.h>
  39 #include <asm/io.h>
  40 #include <asm/kdump.h>
  41 #include <asm/smp.h>
  42 #include <asm/mmu.h>
  43 #include <asm/paca.h>
  44 #include <asm/pgtable.h>
  45 #include <asm/powernv.h>
  46 #include <asm/iommu.h>
  47 #include <asm/btext.h>
  48 #include <asm/sections.h>
  49 #include <asm/machdep.h>
  50 #include <asm/pci-bridge.h>
  51 #include <asm/kexec.h>
  52 #include <asm/opal.h>
  53 #include <asm/fadump.h>
  54 #include <asm/epapr_hcalls.h>
  55 #include <asm/firmware.h>
  56 #include <asm/dt_cpu_ftrs.h>
  57 #include <asm/drmem.h>
  58 #include <asm/ultravisor.h>
  59
  60 #include <mm/mmu_decl.h>
  61
  62 #ifdef DEBUG
  63 #define DBG(fmt...) printk(KERN_ERR fmt)
  64 #else
  65 #define DBG(fmt...)
  66 #endif
  67
  68 #ifdef CONFIG_PPC64
  69 int __initdata iommu_is_off;
  70 int __initdata iommu_force_on;
  71 unsigned long tce_alloc_start, tce_alloc_end;
  72 u64 ppc64_rma_size;
  73 #endif
  74 static phys_addr_t first_memblock_size;
  75 static int __initdata boot_cpu_count;
  76
  77 static int __init early_parse_mem(char *p)
  78 {
  79         if (!p)
  80                 return 1;
  81
  82         memory_limit = PAGE_ALIGN(memparse(p, &p));
  83         DBG("memory limit = 0x%llx\n", memory_limit);
  84
  85         return 0;
  86 }
  87 early_param("mem", early_parse_mem);
  88
  89 /*
  90  * overlaps_initrd - check for overlap with page aligned extension of
  91  * initrd.
  92  */
  93 static inline int overlaps_initrd(unsigned long start, unsigned long size)
  94 {
  95 #ifdef CONFIG_BLK_DEV_INITRD
  96         if (!initrd_start)
  97                 return 0;
  98
  99         return  (start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) &&
 100                         start <= _ALIGN_UP(initrd_end, PAGE_SIZE);
 101 #else
 102         return 0;
 103 #endif
 104 }
 105
 106 /**
 107  * move_device_tree - move tree to an unused area, if needed.
 108  *
 109  * The device tree may be allocated beyond our memory limit, or inside the
 110  * crash kernel region for kdump, or within the page aligned range of initrd.
 111  * If so, move it out of the way.
 112  */
 113 static void __init move_device_tree(void)
 114 {
 115         unsigned long start, size;
 116         void *p;
 117
 118         DBG("-> move_device_tree\n");
 119
 120         start = __pa(initial_boot_params);
 121         size = fdt_totalsize(initial_boot_params);
 122
 123         if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
 124             !memblock_is_memory(start + size - 1) ||
 125             overlaps_crashkernel(start, size) || overlaps_initrd(start, size)) {
 126                 p = memblock_alloc_raw(size, PAGE_SIZE);
 127                 if (!p)
 128                         panic("Failed to allocate %lu bytes to move device tree\n",
 129                               size);
 130                 memcpy(p, initial_boot_params, size);
 131                 initial_boot_params = p;
 132                 DBG("Moved device tree to 0x%px\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         int i;
 294         struct feature_property *fp = feature_properties;
 295         const __be32 *prop;
 296
 297         for (i = 0; i < (int)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                 if (be32_to_cpu(intserv[i]) ==
 335                         fdt_boot_cpuid_phys(initial_boot_params)) {
 336                         found = boot_cpu_count;
 337                         found_thread = i;
 338                 }
 339 #ifdef CONFIG_SMP
 340                 /* logical cpu id is always 0 on UP kernels */
 341                 boot_cpu_count++;
 342 #endif
 343         }
 344
 345         /* Not the boot CPU */
 346         if (found < 0)
 347                 return 0;
 348
 349         DBG("boot cpu: logical %d physical %d\n", found,
 350             be32_to_cpu(intserv[found_thread]));
 351         boot_cpuid = found;
 352
 353         /*
 354          * PAPR defines "logical" PVR values for cpus that
 355          * meet various levels of the architecture:
 356          * 0x0f000001   Architecture version 2.04
 357          * 0x0f000002   Architecture version 2.05
 358          * If the cpu-version property in the cpu node contains
 359          * such a value, we call identify_cpu again with the
 360          * logical PVR value in order to use the cpu feature
 361          * bits appropriate for the architecture level.
 362          *
 363          * A POWER6 partition in "POWER6 architected" mode
 364          * uses the 0x0f000002 PVR value; in POWER5+ mode
 365          * it uses 0x0f000001.
 366          *
 367          * If we're using device tree CPU feature discovery then we don't
 368          * support the cpu-version property, and it's the responsibility of the
 369          * firmware/hypervisor to provide the correct feature set for the
 370          * architecture level via the ibm,powerpc-cpu-features binding.
 371          */
 372         if (!dt_cpu_ftrs_in_use()) {
 373                 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
 374                 if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
 375                         identify_cpu(0, be32_to_cpup(prop));
 376
 377                 check_cpu_feature_properties(node);
 378                 check_cpu_pa_features(node);
 379         }
 380
 381         identical_pvr_fixup(node);
 382         init_mmu_slb_size(node);
 383
 384 #ifdef CONFIG_PPC64
 385         if (nthreads == 1)
 386                 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
 387         else if (!dt_cpu_ftrs_in_use())
 388                 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
 389         allocate_paca(boot_cpuid);
 390 #endif
 391         set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
 392
 393         return 0;
 394 }
 395
 396 static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
 397                                                 const char *uname,
 398                                                 int depth, void *data)
 399 {
 400         const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
 401
 402         /* Use common scan routine to determine if this is the chosen node */
 403         if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
 404                 return 0;
 405
 406 #ifdef CONFIG_PPC64
 407         /* check if iommu is forced on or off */
 408         if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
 409                 iommu_is_off = 1;
 410         if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
 411                 iommu_force_on = 1;
 412 #endif
 413
 414         /* mem=x on the command line is the preferred mechanism */
 415         lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
 416         if (lprop)
 417                 memory_limit = *lprop;
 418
 419 #ifdef CONFIG_PPC64
 420         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
 421         if (lprop)
 422                 tce_alloc_start = *lprop;
 423         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
 424         if (lprop)
 425                 tce_alloc_end = *lprop;
 426 #endif
 427
 428 #ifdef CONFIG_KEXEC_CORE
 429         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
 430         if (lprop)
 431                 crashk_res.start = *lprop;
 432
 433         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
 434         if (lprop)
 435                 crashk_res.end = crashk_res.start + *lprop - 1;
 436 #endif
 437
 438         /* break now */
 439         return 1;
 440 }
 441
 442 /*
 443  * Compare the range against max mem limit and update
 444  * size if it cross the limit.
 445  */
 446
 447 #ifdef CONFIG_SPARSEMEM
 448 static bool validate_mem_limit(u64 base, u64 *size)
 449 {
 450         u64 max_mem = 1UL << (MAX_PHYSMEM_BITS);
 451
 452         if (base >= max_mem)
 453                 return false;
 454         if ((base + *size) > max_mem)
 455                 *size = max_mem - base;
 456         return true;
 457 }
 458 #else
 459 static bool validate_mem_limit(u64 base, u64 *size)
 460 {
 461         return true;
 462 }
 463 #endif
 464
 465 #ifdef CONFIG_PPC_PSERIES
 466 /*
 467  * Interpret the ibm dynamic reconfiguration memory LMBs.
 468  * This contains a list of memory blocks along with NUMA affinity
 469  * information.
 470  */
 471 static void __init early_init_drmem_lmb(struct drmem_lmb *lmb,
 472                                         const __be32 **usm)
 473 {
 474         u64 base, size;
 475         int is_kexec_kdump = 0, rngs;
 476
 477         base = lmb->base_addr;
 478         size = drmem_lmb_size();
 479         rngs = 1;
 480
 481         /*
 482          * Skip this block if the reserved bit is set in flags
 483          * or if the block is not assigned to this partition.
 484          */
 485         if ((lmb->flags & DRCONF_MEM_RESERVED) ||
 486             !(lmb->flags & DRCONF_MEM_ASSIGNED))
 487                 return;
 488
 489         if (*usm)
 490                 is_kexec_kdump = 1;
 491
 492         if (is_kexec_kdump) {
 493                 /*
 494                  * For each memblock in ibm,dynamic-memory, a
 495                  * corresponding entry in linux,drconf-usable-memory
 496                  * property contains a counter 'p' followed by 'p'
 497                  * (base, size) duple. Now read the counter from
 498                  * linux,drconf-usable-memory property
 499                  */
 500                 rngs = dt_mem_next_cell(dt_root_size_cells, usm);
 501                 if (!rngs) /* there are no (base, size) duple */
 502                         return;
 503         }
 504
 505         do {
 506                 if (is_kexec_kdump) {
 507                         base = dt_mem_next_cell(dt_root_addr_cells, usm);
 508                         size = dt_mem_next_cell(dt_root_size_cells, usm);
 509                 }
 510
 511                 if (iommu_is_off) {
 512                         if (base >= 0x80000000ul)
 513                                 continue;
 514                         if ((base + size) > 0x80000000ul)
 515                                 size = 0x80000000ul - base;
 516                 }
 517
 518                 DBG("Adding: %llx -> %llx\n", base, size);
 519                 if (validate_mem_limit(base, &size))
 520                         memblock_add(base, size);
 521         } while (--rngs);
 522 }
 523 #endif /* CONFIG_PPC_PSERIES */
 524
 525 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
 526                                                 const char *uname,
 527                                                 int depth, void *data)
 528 {
 529 #ifdef CONFIG_PPC_PSERIES
 530         if (depth == 1 &&
 531             strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) {
 532                 walk_drmem_lmbs_early(node, early_init_drmem_lmb);
 533                 return 0;
 534         }
 535 #endif
 536
 537         return early_init_dt_scan_memory(node, uname, depth, data);
 538 }
 539
 540 /*
 541  * For a relocatable kernel, we need to get the memstart_addr first,
 542  * then use it to calculate the virtual kernel start address. This has
 543  * to happen at a very early stage (before machine_init). In this case,
 544  * we just want to get the memstart_address and would not like to mess the
 545  * memblock at this stage. So introduce a variable to skip the memblock_add()
 546  * for this reason.
 547  */
 548 #ifdef CONFIG_RELOCATABLE
 549 static int add_mem_to_memblock = 1;
 550 #else
 551 #define add_mem_to_memblock 1
 552 #endif
 553
 554 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 555 {
 556 #ifdef CONFIG_PPC64
 557         if (iommu_is_off) {
 558                 if (base >= 0x80000000ul)
 559                         return;
 560                 if ((base + size) > 0x80000000ul)
 561                         size = 0x80000000ul - base;
 562         }
 563 #endif
 564         /* Keep track of the beginning of memory -and- the size of
 565          * the very first block in the device-tree as it represents
 566          * the RMA on ppc64 server
 567          */
 568         if (base < memstart_addr) {
 569                 memstart_addr = base;
 570                 first_memblock_size = size;
 571         }
 572
 573         /* Add the chunk to the MEMBLOCK list */
 574         if (add_mem_to_memblock) {
 575                 if (validate_mem_limit(base, &size))
 576                         memblock_add(base, size);
 577         }
 578 }
 579
 580 static void __init early_reserve_mem_dt(void)
 581 {
 582         unsigned long i, dt_root;
 583         int len;
 584         const __be32 *prop;
 585
 586         early_init_fdt_reserve_self();
 587         early_init_fdt_scan_reserved_mem();
 588
 589         dt_root = of_get_flat_dt_root();
 590
 591         prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
 592
 593         if (!prop)
 594                 return;
 595
 596         DBG("Found new-style reserved-ranges\n");
 597
 598         /* Each reserved range is an (address,size) pair, 2 cells each,
 599          * totalling 4 cells per range. */
 600         for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
 601                 u64 base, size;
 602
 603                 base = of_read_number(prop + (i * 4) + 0, 2);
 604                 size = of_read_number(prop + (i * 4) + 2, 2);
 605
 606                 if (size) {
 607                         DBG("reserving: %llx -> %llx\n", base, size);
 608                         memblock_reserve(base, size);
 609                 }
 610         }
 611 }
 612
 613 static void __init early_reserve_mem(void)
 614 {
 615         __be64 *reserve_map;
 616
 617         reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
 618                         fdt_off_mem_rsvmap(initial_boot_params));
 619
 620         /* Look for the new "reserved-regions" property in the DT */
 621         early_reserve_mem_dt();
 622
 623 #ifdef CONFIG_BLK_DEV_INITRD
 624         /* Then reserve the initrd, if any */
 625         if (initrd_start && (initrd_end > initrd_start)) {
 626                 memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
 627                         _ALIGN_UP(initrd_end, PAGE_SIZE) -
 628                         _ALIGN_DOWN(initrd_start, PAGE_SIZE));
 629         }
 630 #endif /* CONFIG_BLK_DEV_INITRD */
 631
 632 #ifdef CONFIG_PPC32
 633         /*
 634          * Handle the case where we might be booting from an old kexec
 635          * image that setup the mem_rsvmap as pairs of 32-bit values
 636          */
 637         if (be64_to_cpup(reserve_map) > 0xffffffffull) {
 638                 u32 base_32, size_32;
 639                 __be32 *reserve_map_32 = (__be32 *)reserve_map;
 640
 641                 DBG("Found old 32-bit reserve map\n");
 642
 643                 while (1) {
 644                         base_32 = be32_to_cpup(reserve_map_32++);
 645                         size_32 = be32_to_cpup(reserve_map_32++);
 646                         if (size_32 == 0)
 647                                 break;
 648                         DBG("reserving: %x -> %x\n", base_32, size_32);
 649                         memblock_reserve(base_32, size_32);
 650                 }
 651                 return;
 652         }
 653 #endif
 654 }
 655
 656 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 657 static bool tm_disabled __initdata;
 658
 659 static int __init parse_ppc_tm(char *str)
 660 {
 661         bool res;
 662
 663         if (kstrtobool(str, &res))
 664                 return -EINVAL;
 665
 666         tm_disabled = !res;
 667
 668         return 0;
 669 }
 670 early_param("ppc_tm", parse_ppc_tm);
 671
 672 static void __init tm_init(void)
 673 {
 674         if (tm_disabled) {
 675                 pr_info("Disabling hardware transactional memory (HTM)\n");
 676                 cur_cpu_spec->cpu_user_features2 &=
 677                         ~(PPC_FEATURE2_HTM_NOSC | PPC_FEATURE2_HTM);
 678                 cur_cpu_spec->cpu_features &= ~CPU_FTR_TM;
 679                 return;
 680         }
 681
 682         pnv_tm_init();
 683 }
 684 #else
 685 static void tm_init(void) { }
 686 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
 687
 688 void __init early_init_devtree(void *params)
 689 {
 690         phys_addr_t limit;
 691
 692         DBG(" -> early_init_devtree(%px)\n", params);
 693
 694         /* Too early to BUG_ON(), do it by hand */
 695         if (!early_init_dt_verify(params))
 696                 panic("BUG: Failed verifying flat device tree, bad version?");
 697
 698 #ifdef CONFIG_PPC_RTAS
 699         /* Some machines might need RTAS info for debugging, grab it now. */
 700         of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
 701 #endif
 702
 703 #ifdef CONFIG_PPC_POWERNV
 704         /* Some machines might need OPAL info for debugging, grab it now. */
 705         of_scan_flat_dt(early_init_dt_scan_opal, NULL);
 706
 707         /* Scan tree for ultravisor feature */
 708         of_scan_flat_dt(early_init_dt_scan_ultravisor, NULL);
 709 #endif
 710
 711 #if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP)
 712         /* scan tree to see if dump is active during last boot */
 713         of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
 714 #endif
 715
 716         /* Retrieve various informations from the /chosen node of the
 717          * device-tree, including the platform type, initrd location and
 718          * size, TCE reserve, and more ...
 719          */
 720         of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line);
 721
 722         /* Scan memory nodes and rebuild MEMBLOCKs */
 723         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 724         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
 725
 726         parse_early_param();
 727
 728         /* make sure we've parsed cmdline for mem= before this */
 729         if (memory_limit)
 730                 first_memblock_size = min_t(u64, first_memblock_size, memory_limit);
 731         setup_initial_memory_limit(memstart_addr, first_memblock_size);
 732         /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
 733         memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
 734         /* If relocatable, reserve first 32k for interrupt vectors etc. */
 735         if (PHYSICAL_START > MEMORY_START)
 736                 memblock_reserve(MEMORY_START, 0x8000);
 737         reserve_kdump_trampoline();
 738 #if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP)
 739         /*
 740          * If we fail to reserve memory for firmware-assisted dump then
 741          * fallback to kexec based kdump.
 742          */
 743         if (fadump_reserve_mem() == 0)
 744 #endif
 745                 reserve_crashkernel();
 746         early_reserve_mem();
 747
 748         /* Ensure that total memory size is page-aligned. */
 749         limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
 750         memblock_enforce_memory_limit(limit);
 751
 752         memblock_allow_resize();
 753         memblock_dump_all();
 754
 755         DBG("Phys. mem: %llx\n", (unsigned long long)memblock_phys_mem_size());
 756
 757         /* We may need to relocate the flat tree, do it now.
 758          * FIXME .. and the initrd too? */
 759         move_device_tree();
 760
 761         allocate_paca_ptrs();
 762
 763         DBG("Scanning CPUs ...\n");
 764
 765         dt_cpu_ftrs_scan();
 766
 767         /* Retrieve CPU related informations from the flat tree
 768          * (altivec support, boot CPU ID, ...)
 769          */
 770         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
 771         if (boot_cpuid < 0) {
 772                 printk("Failed to identify boot CPU !\n");
 773                 BUG();
 774         }
 775
 776 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
 777         /* We'll later wait for secondaries to check in; there are
 778          * NCPUS-1 non-boot CPUs  :-)
 779          */
 780         spinning_secondaries = boot_cpu_count - 1;
 781 #endif
 782
 783         mmu_early_init_devtree();
 784
 785 #ifdef CONFIG_PPC_POWERNV
 786         /* Scan and build the list of machine check recoverable ranges */
 787         of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL);
 788 #endif
 789         epapr_paravirt_early_init();
 790
 791         /* Now try to figure out if we are running on LPAR and so on */
 792         pseries_probe_fw_features();
 793
 794 #ifdef CONFIG_PPC_PS3
 795         /* Identify PS3 firmware */
 796         if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3"))
 797                 powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE;
 798 #endif
 799
 800         tm_init();
 801
 802         DBG(" <- early_init_devtree()\n");
 803 }
 804
 805 #ifdef CONFIG_RELOCATABLE
 806 /*
 807  * This function run before early_init_devtree, so we have to init
 808  * initial_boot_params.
 809  */
 810 void __init early_get_first_memblock_info(void *params, phys_addr_t *size)
 811 {
 812         /* Setup flat device-tree pointer */
 813         initial_boot_params = params;
 814
 815         /*
 816          * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid
 817          * mess the memblock.
 818          */
 819         add_mem_to_memblock = 0;
 820         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 821         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
 822         add_mem_to_memblock = 1;
 823
 824         if (size)
 825                 *size = first_memblock_size;
 826 }
 827 #endif
 828
 829 /*******
 830  *
 831  * New implementation of the OF "find" APIs, return a refcounted
 832  * object, call of_node_put() when done.  The device tree and list
 833  * are protected by a rw_lock.
 834  *
 835  * Note that property management will need some locking as well,
 836  * this isn't dealt with yet.
 837  *
 838  *******/
 839
 840 /**
 841  * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
 842  * @np: device node of the device
 843  *
 844  * This looks for a property "ibm,chip-id" in the node or any
 845  * of its parents and returns its content, or -1 if it cannot
 846  * be found.
 847  */
 848 int of_get_ibm_chip_id(struct device_node *np)
 849 {
 850         of_node_get(np);
 851         while (np) {
 852                 u32 chip_id;
 853
 854                 /*
 855                  * Skiboot may produce memory nodes that contain more than one
 856                  * cell in chip-id, we only read the first one here.
 857                  */
 858                 if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) {
 859                         of_node_put(np);
 860                         return chip_id;
 861                 }
 862
 863                 np = of_get_next_parent(np);
 864         }
 865         return -1;
 866 }
 867 EXPORT_SYMBOL(of_get_ibm_chip_id);
 868
 869 /**
 870  * cpu_to_chip_id - Return the cpus chip-id
 871  * @cpu: The logical cpu number.
 872  *
 873  * Return the value of the ibm,chip-id property corresponding to the given
 874  * logical cpu number. If the chip-id can not be found, returns -1.
 875  */
 876 int cpu_to_chip_id(int cpu)
 877 {
 878         struct device_node *np;
 879
 880         np = of_get_cpu_node(cpu, NULL);
 881         if (!np)
 882                 return -1;
 883
 884         of_node_put(np);
 885         return of_get_ibm_chip_id(np);
 886 }
 887 EXPORT_SYMBOL(cpu_to_chip_id);
 888
 889 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
 890 {
 891 #ifdef CONFIG_SMP
 892         /*
 893          * Early firmware scanning must use this rather than
 894          * get_hard_smp_processor_id because we don't have pacas allocated
 895          * until memory topology is discovered.
 896          */
 897         if (cpu_to_phys_id != NULL)
 898                 return (int)phys_id == cpu_to_phys_id[cpu];
 899 #endif
 900
 901         return (int)phys_id == get_hard_smp_processor_id(cpu);
 902 }