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