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 #include <linux/pgtable.h> 34 35 #include <asm/prom.h> 36 #include <asm/rtas.h> 37 #include <asm/page.h> 38 #include <asm/processor.h> 39 #include <asm/irq.h> 40 #include <asm/io.h> 41 #include <asm/kdump.h> 42 #include <asm/smp.h> 43 #include <asm/mmu.h> 44 #include <asm/paca.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(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 | MMU_FTR_GTSE }, 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 { .pabyte = 64, .pabit = 0, .cpu_features = CPU_FTR_DAWR1 }, 180 }; 181 182 static void __init scan_features(unsigned long node, const unsigned char *ftrs, 183 unsigned long tablelen, 184 struct ibm_pa_feature *fp, 185 unsigned long ft_size) 186 { 187 unsigned long i, len, bit; 188 189 /* find descriptor with type == 0 */ 190 for (;;) { 191 if (tablelen < 3) 192 return; 193 len = 2 + ftrs[0]; 194 if (tablelen < len) 195 return; /* descriptor 0 not found */ 196 if (ftrs[1] == 0) 197 break; 198 tablelen -= len; 199 ftrs += len; 200 } 201 202 /* loop over bits we know about */ 203 for (i = 0; i < ft_size; ++i, ++fp) { 204 if (fp->pabyte >= ftrs[0]) 205 continue; 206 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; 207 if (bit ^ fp->invert) { 208 cur_cpu_spec->cpu_features |= fp->cpu_features; 209 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; 210 cur_cpu_spec->cpu_user_features2 |= fp->cpu_user_ftrs2; 211 cur_cpu_spec->mmu_features |= fp->mmu_features; 212 } else { 213 cur_cpu_spec->cpu_features &= ~fp->cpu_features; 214 cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs; 215 cur_cpu_spec->cpu_user_features2 &= ~fp->cpu_user_ftrs2; 216 cur_cpu_spec->mmu_features &= ~fp->mmu_features; 217 } 218 } 219 } 220 221 static void __init check_cpu_pa_features(unsigned long node) 222 { 223 const unsigned char *pa_ftrs; 224 int tablelen; 225 226 pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); 227 if (pa_ftrs == NULL) 228 return; 229 230 scan_features(node, pa_ftrs, tablelen, 231 ibm_pa_features, ARRAY_SIZE(ibm_pa_features)); 232 } 233 234 #ifdef CONFIG_PPC_BOOK3S_64 235 static void __init init_mmu_slb_size(unsigned long node) 236 { 237 const __be32 *slb_size_ptr; 238 239 slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? : 240 of_get_flat_dt_prop(node, "ibm,slb-size", NULL); 241 242 if (slb_size_ptr) 243 mmu_slb_size = be32_to_cpup(slb_size_ptr); 244 } 245 #else 246 #define init_mmu_slb_size(node) do { } while(0) 247 #endif 248 249 static struct feature_property { 250 const char *name; 251 u32 min_value; 252 unsigned long cpu_feature; 253 unsigned long cpu_user_ftr; 254 } feature_properties[] __initdata = { 255 #ifdef CONFIG_ALTIVEC 256 {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, 257 {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, 258 #endif /* CONFIG_ALTIVEC */ 259 #ifdef CONFIG_VSX 260 /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */ 261 {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX}, 262 #endif /* CONFIG_VSX */ 263 #ifdef CONFIG_PPC64 264 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP}, 265 {"ibm,purr", 1, CPU_FTR_PURR, 0}, 266 {"ibm,spurr", 1, CPU_FTR_SPURR, 0}, 267 #endif /* CONFIG_PPC64 */ 268 }; 269 270 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU) 271 static inline void identical_pvr_fixup(unsigned long node) 272 { 273 unsigned int pvr; 274 const char *model = of_get_flat_dt_prop(node, "model", NULL); 275 276 /* 277 * Since 440GR(x)/440EP(x) processors have the same pvr, 278 * we check the node path and set bit 28 in the cur_cpu_spec 279 * pvr for EP(x) processor version. This bit is always 0 in 280 * the "real" pvr. Then we call identify_cpu again with 281 * the new logical pvr to enable FPU support. 282 */ 283 if (model && strstr(model, "440EP")) { 284 pvr = cur_cpu_spec->pvr_value | 0x8; 285 identify_cpu(0, pvr); 286 DBG("Using logical pvr %x for %s\n", pvr, model); 287 } 288 } 289 #else 290 #define identical_pvr_fixup(node) do { } while(0) 291 #endif 292 293 static void __init check_cpu_feature_properties(unsigned long node) 294 { 295 int i; 296 struct feature_property *fp = feature_properties; 297 const __be32 *prop; 298 299 for (i = 0; i < (int)ARRAY_SIZE(feature_properties); ++i, ++fp) { 300 prop = of_get_flat_dt_prop(node, fp->name, NULL); 301 if (prop && be32_to_cpup(prop) >= fp->min_value) { 302 cur_cpu_spec->cpu_features |= fp->cpu_feature; 303 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr; 304 } 305 } 306 } 307 308 static int __init early_init_dt_scan_cpus(unsigned long node, 309 const char *uname, int depth, 310 void *data) 311 { 312 const char *type = of_get_flat_dt_prop(node, "device_type", NULL); 313 const __be32 *prop; 314 const __be32 *intserv; 315 int i, nthreads; 316 int len; 317 int found = -1; 318 int found_thread = 0; 319 320 /* We are scanning "cpu" nodes only */ 321 if (type == NULL || strcmp(type, "cpu") != 0) 322 return 0; 323 324 /* Get physical cpuid */ 325 intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len); 326 if (!intserv) 327 intserv = of_get_flat_dt_prop(node, "reg", &len); 328 329 nthreads = len / sizeof(int); 330 331 /* 332 * Now see if any of these threads match our boot cpu. 333 * NOTE: This must match the parsing done in smp_setup_cpu_maps. 334 */ 335 for (i = 0; i < nthreads; i++) { 336 if (be32_to_cpu(intserv[i]) == 337 fdt_boot_cpuid_phys(initial_boot_params)) { 338 found = boot_cpu_count; 339 found_thread = i; 340 } 341 #ifdef CONFIG_SMP 342 /* logical cpu id is always 0 on UP kernels */ 343 boot_cpu_count++; 344 #endif 345 } 346 347 /* Not the boot CPU */ 348 if (found < 0) 349 return 0; 350 351 DBG("boot cpu: logical %d physical %d\n", found, 352 be32_to_cpu(intserv[found_thread])); 353 boot_cpuid = found; 354 355 /* 356 * PAPR defines "logical" PVR values for cpus that 357 * meet various levels of the architecture: 358 * 0x0f000001 Architecture version 2.04 359 * 0x0f000002 Architecture version 2.05 360 * If the cpu-version property in the cpu node contains 361 * such a value, we call identify_cpu again with the 362 * logical PVR value in order to use the cpu feature 363 * bits appropriate for the architecture level. 364 * 365 * A POWER6 partition in "POWER6 architected" mode 366 * uses the 0x0f000002 PVR value; in POWER5+ mode 367 * it uses 0x0f000001. 368 * 369 * If we're using device tree CPU feature discovery then we don't 370 * support the cpu-version property, and it's the responsibility of the 371 * firmware/hypervisor to provide the correct feature set for the 372 * architecture level via the ibm,powerpc-cpu-features binding. 373 */ 374 if (!dt_cpu_ftrs_in_use()) { 375 prop = of_get_flat_dt_prop(node, "cpu-version", NULL); 376 if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000) 377 identify_cpu(0, be32_to_cpup(prop)); 378 379 check_cpu_feature_properties(node); 380 check_cpu_pa_features(node); 381 } 382 383 identical_pvr_fixup(node); 384 init_mmu_slb_size(node); 385 386 #ifdef CONFIG_PPC64 387 if (nthreads == 1) 388 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; 389 else if (!dt_cpu_ftrs_in_use()) 390 cur_cpu_spec->cpu_features |= CPU_FTR_SMT; 391 allocate_paca(boot_cpuid); 392 #endif 393 set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread])); 394 395 return 0; 396 } 397 398 static int __init early_init_dt_scan_chosen_ppc(unsigned long node, 399 const char *uname, 400 int depth, void *data) 401 { 402 const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */ 403 404 /* Use common scan routine to determine if this is the chosen node */ 405 if (early_init_dt_scan_chosen(node, uname, depth, data) == 0) 406 return 0; 407 408 #ifdef CONFIG_PPC64 409 /* check if iommu is forced on or off */ 410 if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) 411 iommu_is_off = 1; 412 if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) 413 iommu_force_on = 1; 414 #endif 415 416 /* mem=x on the command line is the preferred mechanism */ 417 lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); 418 if (lprop) 419 memory_limit = *lprop; 420 421 #ifdef CONFIG_PPC64 422 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); 423 if (lprop) 424 tce_alloc_start = *lprop; 425 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); 426 if (lprop) 427 tce_alloc_end = *lprop; 428 #endif 429 430 #ifdef CONFIG_KEXEC_CORE 431 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); 432 if (lprop) 433 crashk_res.start = *lprop; 434 435 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); 436 if (lprop) 437 crashk_res.end = crashk_res.start + *lprop - 1; 438 #endif 439 440 /* break now */ 441 return 1; 442 } 443 444 /* 445 * Compare the range against max mem limit and update 446 * size if it cross the limit. 447 */ 448 449 #ifdef CONFIG_SPARSEMEM 450 static bool validate_mem_limit(u64 base, u64 *size) 451 { 452 u64 max_mem = 1UL << (MAX_PHYSMEM_BITS); 453 454 if (base >= max_mem) 455 return false; 456 if ((base + *size) > max_mem) 457 *size = max_mem - base; 458 return true; 459 } 460 #else 461 static bool validate_mem_limit(u64 base, u64 *size) 462 { 463 return true; 464 } 465 #endif 466 467 #ifdef CONFIG_PPC_PSERIES 468 /* 469 * Interpret the ibm dynamic reconfiguration memory LMBs. 470 * This contains a list of memory blocks along with NUMA affinity 471 * information. 472 */ 473 static int __init early_init_drmem_lmb(struct drmem_lmb *lmb, 474 const __be32 **usm, 475 void *data) 476 { 477 u64 base, size; 478 int is_kexec_kdump = 0, rngs; 479 480 base = lmb->base_addr; 481 size = drmem_lmb_size(); 482 rngs = 1; 483 484 /* 485 * Skip this block if the reserved bit is set in flags 486 * or if the block is not assigned to this partition. 487 */ 488 if ((lmb->flags & DRCONF_MEM_RESERVED) || 489 !(lmb->flags & DRCONF_MEM_ASSIGNED)) 490 return 0; 491 492 if (*usm) 493 is_kexec_kdump = 1; 494 495 if (is_kexec_kdump) { 496 /* 497 * For each memblock in ibm,dynamic-memory, a 498 * corresponding entry in linux,drconf-usable-memory 499 * property contains a counter 'p' followed by 'p' 500 * (base, size) duple. Now read the counter from 501 * linux,drconf-usable-memory property 502 */ 503 rngs = dt_mem_next_cell(dt_root_size_cells, usm); 504 if (!rngs) /* there are no (base, size) duple */ 505 return 0; 506 } 507 508 do { 509 if (is_kexec_kdump) { 510 base = dt_mem_next_cell(dt_root_addr_cells, usm); 511 size = dt_mem_next_cell(dt_root_size_cells, usm); 512 } 513 514 if (iommu_is_off) { 515 if (base >= 0x80000000ul) 516 continue; 517 if ((base + size) > 0x80000000ul) 518 size = 0x80000000ul - base; 519 } 520 521 if (!validate_mem_limit(base, &size)) 522 continue; 523 524 DBG("Adding: %llx -> %llx\n", base, size); 525 memblock_add(base, size); 526 527 if (lmb->flags & DRCONF_MEM_HOTREMOVABLE) 528 memblock_mark_hotplug(base, size); 529 } while (--rngs); 530 531 return 0; 532 } 533 #endif /* CONFIG_PPC_PSERIES */ 534 535 static int __init early_init_dt_scan_memory_ppc(unsigned long node, 536 const char *uname, 537 int depth, void *data) 538 { 539 #ifdef CONFIG_PPC_PSERIES 540 if (depth == 1 && 541 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) { 542 walk_drmem_lmbs_early(node, NULL, early_init_drmem_lmb); 543 return 0; 544 } 545 #endif 546 547 return early_init_dt_scan_memory(node, uname, depth, data); 548 } 549 550 /* 551 * For a relocatable kernel, we need to get the memstart_addr first, 552 * then use it to calculate the virtual kernel start address. This has 553 * to happen at a very early stage (before machine_init). In this case, 554 * we just want to get the memstart_address and would not like to mess the 555 * memblock at this stage. So introduce a variable to skip the memblock_add() 556 * for this reason. 557 */ 558 #ifdef CONFIG_RELOCATABLE 559 static int add_mem_to_memblock = 1; 560 #else 561 #define add_mem_to_memblock 1 562 #endif 563 564 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 565 { 566 #ifdef CONFIG_PPC64 567 if (iommu_is_off) { 568 if (base >= 0x80000000ul) 569 return; 570 if ((base + size) > 0x80000000ul) 571 size = 0x80000000ul - base; 572 } 573 #endif 574 /* Keep track of the beginning of memory -and- the size of 575 * the very first block in the device-tree as it represents 576 * the RMA on ppc64 server 577 */ 578 if (base < memstart_addr) { 579 memstart_addr = base; 580 first_memblock_size = size; 581 } 582 583 /* Add the chunk to the MEMBLOCK list */ 584 if (add_mem_to_memblock) { 585 if (validate_mem_limit(base, &size)) 586 memblock_add(base, size); 587 } 588 } 589 590 static void __init early_reserve_mem_dt(void) 591 { 592 unsigned long i, dt_root; 593 int len; 594 const __be32 *prop; 595 596 early_init_fdt_reserve_self(); 597 early_init_fdt_scan_reserved_mem(); 598 599 dt_root = of_get_flat_dt_root(); 600 601 prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len); 602 603 if (!prop) 604 return; 605 606 DBG("Found new-style reserved-ranges\n"); 607 608 /* Each reserved range is an (address,size) pair, 2 cells each, 609 * totalling 4 cells per range. */ 610 for (i = 0; i < len / (sizeof(*prop) * 4); i++) { 611 u64 base, size; 612 613 base = of_read_number(prop + (i * 4) + 0, 2); 614 size = of_read_number(prop + (i * 4) + 2, 2); 615 616 if (size) { 617 DBG("reserving: %llx -> %llx\n", base, size); 618 memblock_reserve(base, size); 619 } 620 } 621 } 622 623 static void __init early_reserve_mem(void) 624 { 625 __be64 *reserve_map; 626 627 reserve_map = (__be64 *)(((unsigned long)initial_boot_params) + 628 fdt_off_mem_rsvmap(initial_boot_params)); 629 630 /* Look for the new "reserved-regions" property in the DT */ 631 early_reserve_mem_dt(); 632 633 #ifdef CONFIG_BLK_DEV_INITRD 634 /* Then reserve the initrd, if any */ 635 if (initrd_start && (initrd_end > initrd_start)) { 636 memblock_reserve(ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE), 637 ALIGN(initrd_end, PAGE_SIZE) - 638 ALIGN_DOWN(initrd_start, PAGE_SIZE)); 639 } 640 #endif /* CONFIG_BLK_DEV_INITRD */ 641 642 #ifdef CONFIG_PPC32 643 /* 644 * Handle the case where we might be booting from an old kexec 645 * image that setup the mem_rsvmap as pairs of 32-bit values 646 */ 647 if (be64_to_cpup(reserve_map) > 0xffffffffull) { 648 u32 base_32, size_32; 649 __be32 *reserve_map_32 = (__be32 *)reserve_map; 650 651 DBG("Found old 32-bit reserve map\n"); 652 653 while (1) { 654 base_32 = be32_to_cpup(reserve_map_32++); 655 size_32 = be32_to_cpup(reserve_map_32++); 656 if (size_32 == 0) 657 break; 658 DBG("reserving: %x -> %x\n", base_32, size_32); 659 memblock_reserve(base_32, size_32); 660 } 661 return; 662 } 663 #endif 664 } 665 666 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 667 static bool tm_disabled __initdata; 668 669 static int __init parse_ppc_tm(char *str) 670 { 671 bool res; 672 673 if (kstrtobool(str, &res)) 674 return -EINVAL; 675 676 tm_disabled = !res; 677 678 return 0; 679 } 680 early_param("ppc_tm", parse_ppc_tm); 681 682 static void __init tm_init(void) 683 { 684 if (tm_disabled) { 685 pr_info("Disabling hardware transactional memory (HTM)\n"); 686 cur_cpu_spec->cpu_user_features2 &= 687 ~(PPC_FEATURE2_HTM_NOSC | PPC_FEATURE2_HTM); 688 cur_cpu_spec->cpu_features &= ~CPU_FTR_TM; 689 return; 690 } 691 692 pnv_tm_init(); 693 } 694 #else 695 static void tm_init(void) { } 696 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ 697 698 #ifdef CONFIG_PPC64 699 static void __init save_fscr_to_task(void) 700 { 701 /* 702 * Ensure the init_task (pid 0, aka swapper) uses the value of FSCR we 703 * have configured via the device tree features or via __init_FSCR(). 704 * That value will then be propagated to pid 1 (init) and all future 705 * processes. 706 */ 707 if (early_cpu_has_feature(CPU_FTR_ARCH_207S)) 708 init_task.thread.fscr = mfspr(SPRN_FSCR); 709 } 710 #else 711 static inline void save_fscr_to_task(void) {}; 712 #endif 713 714 715 void __init early_init_devtree(void *params) 716 { 717 phys_addr_t limit; 718 719 DBG(" -> early_init_devtree(%px)\n", params); 720 721 /* Too early to BUG_ON(), do it by hand */ 722 if (!early_init_dt_verify(params)) 723 panic("BUG: Failed verifying flat device tree, bad version?"); 724 725 #ifdef CONFIG_PPC_RTAS 726 /* Some machines might need RTAS info for debugging, grab it now. */ 727 of_scan_flat_dt(early_init_dt_scan_rtas, NULL); 728 #endif 729 730 #ifdef CONFIG_PPC_POWERNV 731 /* Some machines might need OPAL info for debugging, grab it now. */ 732 of_scan_flat_dt(early_init_dt_scan_opal, NULL); 733 734 /* Scan tree for ultravisor feature */ 735 of_scan_flat_dt(early_init_dt_scan_ultravisor, NULL); 736 #endif 737 738 #if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP) 739 /* scan tree to see if dump is active during last boot */ 740 of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL); 741 #endif 742 743 /* Retrieve various informations from the /chosen node of the 744 * device-tree, including the platform type, initrd location and 745 * size, TCE reserve, and more ... 746 */ 747 of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line); 748 749 /* Scan memory nodes and rebuild MEMBLOCKs */ 750 of_scan_flat_dt(early_init_dt_scan_root, NULL); 751 of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); 752 753 parse_early_param(); 754 755 /* make sure we've parsed cmdline for mem= before this */ 756 if (memory_limit) 757 first_memblock_size = min_t(u64, first_memblock_size, memory_limit); 758 setup_initial_memory_limit(memstart_addr, first_memblock_size); 759 /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */ 760 memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); 761 /* If relocatable, reserve first 32k for interrupt vectors etc. */ 762 if (PHYSICAL_START > MEMORY_START) 763 memblock_reserve(MEMORY_START, 0x8000); 764 reserve_kdump_trampoline(); 765 #if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP) 766 /* 767 * If we fail to reserve memory for firmware-assisted dump then 768 * fallback to kexec based kdump. 769 */ 770 if (fadump_reserve_mem() == 0) 771 #endif 772 reserve_crashkernel(); 773 early_reserve_mem(); 774 775 /* Ensure that total memory size is page-aligned. */ 776 limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE); 777 memblock_enforce_memory_limit(limit); 778 779 #if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_4K_PAGES) 780 if (!early_radix_enabled()) 781 memblock_cap_memory_range(0, 1UL << (H_MAX_PHYSMEM_BITS)); 782 #endif 783 784 memblock_allow_resize(); 785 memblock_dump_all(); 786 787 DBG("Phys. mem: %llx\n", (unsigned long long)memblock_phys_mem_size()); 788 789 /* We may need to relocate the flat tree, do it now. 790 * FIXME .. and the initrd too? */ 791 move_device_tree(); 792 793 allocate_paca_ptrs(); 794 795 DBG("Scanning CPUs ...\n"); 796 797 dt_cpu_ftrs_scan(); 798 799 /* Retrieve CPU related informations from the flat tree 800 * (altivec support, boot CPU ID, ...) 801 */ 802 of_scan_flat_dt(early_init_dt_scan_cpus, NULL); 803 if (boot_cpuid < 0) { 804 printk("Failed to identify boot CPU !\n"); 805 BUG(); 806 } 807 808 save_fscr_to_task(); 809 810 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64) 811 /* We'll later wait for secondaries to check in; there are 812 * NCPUS-1 non-boot CPUs :-) 813 */ 814 spinning_secondaries = boot_cpu_count - 1; 815 #endif 816 817 mmu_early_init_devtree(); 818 819 #ifdef CONFIG_PPC_POWERNV 820 /* Scan and build the list of machine check recoverable ranges */ 821 of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL); 822 #endif 823 epapr_paravirt_early_init(); 824 825 /* Now try to figure out if we are running on LPAR and so on */ 826 pseries_probe_fw_features(); 827 828 /* 829 * Initialize pkey features and default AMR/IAMR values 830 */ 831 pkey_early_init_devtree(); 832 833 #ifdef CONFIG_PPC_PS3 834 /* Identify PS3 firmware */ 835 if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3")) 836 powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE; 837 #endif 838 839 tm_init(); 840 841 DBG(" <- early_init_devtree()\n"); 842 } 843 844 #ifdef CONFIG_RELOCATABLE 845 /* 846 * This function run before early_init_devtree, so we have to init 847 * initial_boot_params. 848 */ 849 void __init early_get_first_memblock_info(void *params, phys_addr_t *size) 850 { 851 /* Setup flat device-tree pointer */ 852 initial_boot_params = params; 853 854 /* 855 * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid 856 * mess the memblock. 857 */ 858 add_mem_to_memblock = 0; 859 of_scan_flat_dt(early_init_dt_scan_root, NULL); 860 of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); 861 add_mem_to_memblock = 1; 862 863 if (size) 864 *size = first_memblock_size; 865 } 866 #endif 867 868 /******* 869 * 870 * New implementation of the OF "find" APIs, return a refcounted 871 * object, call of_node_put() when done. The device tree and list 872 * are protected by a rw_lock. 873 * 874 * Note that property management will need some locking as well, 875 * this isn't dealt with yet. 876 * 877 *******/ 878 879 /** 880 * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device 881 * @np: device node of the device 882 * 883 * This looks for a property "ibm,chip-id" in the node or any 884 * of its parents and returns its content, or -1 if it cannot 885 * be found. 886 */ 887 int of_get_ibm_chip_id(struct device_node *np) 888 { 889 of_node_get(np); 890 while (np) { 891 u32 chip_id; 892 893 /* 894 * Skiboot may produce memory nodes that contain more than one 895 * cell in chip-id, we only read the first one here. 896 */ 897 if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) { 898 of_node_put(np); 899 return chip_id; 900 } 901 902 np = of_get_next_parent(np); 903 } 904 return -1; 905 } 906 EXPORT_SYMBOL(of_get_ibm_chip_id); 907 908 /** 909 * cpu_to_chip_id - Return the cpus chip-id 910 * @cpu: The logical cpu number. 911 * 912 * Return the value of the ibm,chip-id property corresponding to the given 913 * logical cpu number. If the chip-id can not be found, returns -1. 914 */ 915 int cpu_to_chip_id(int cpu) 916 { 917 struct device_node *np; 918 919 np = of_get_cpu_node(cpu, NULL); 920 if (!np) 921 return -1; 922 923 of_node_put(np); 924 return of_get_ibm_chip_id(np); 925 } 926 EXPORT_SYMBOL(cpu_to_chip_id); 927 928 bool arch_match_cpu_phys_id(int cpu, u64 phys_id) 929 { 930 #ifdef CONFIG_SMP 931 /* 932 * Early firmware scanning must use this rather than 933 * get_hard_smp_processor_id because we don't have pacas allocated 934 * until memory topology is discovered. 935 */ 936 if (cpu_to_phys_id != NULL) 937 return (int)phys_id == cpu_to_phys_id[cpu]; 938 #endif 939 940 return (int)phys_id == get_hard_smp_processor_id(cpu); 941 } 942