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 int *chip_id_lookup_table; 69 70 #ifdef CONFIG_PPC64 71 int __initdata iommu_is_off; 72 int __initdata iommu_force_on; 73 unsigned long tce_alloc_start, tce_alloc_end; 74 u64 ppc64_rma_size; 75 #endif 76 static phys_addr_t first_memblock_size; 77 static int __initdata boot_cpu_count; 78 79 static int __init early_parse_mem(char *p) 80 { 81 if (!p) 82 return 1; 83 84 memory_limit = PAGE_ALIGN(memparse(p, &p)); 85 DBG("memory limit = 0x%llx\n", memory_limit); 86 87 return 0; 88 } 89 early_param("mem", early_parse_mem); 90 91 /* 92 * overlaps_initrd - check for overlap with page aligned extension of 93 * initrd. 94 */ 95 static inline int overlaps_initrd(unsigned long start, unsigned long size) 96 { 97 #ifdef CONFIG_BLK_DEV_INITRD 98 if (!initrd_start) 99 return 0; 100 101 return (start + size) > ALIGN_DOWN(initrd_start, PAGE_SIZE) && 102 start <= ALIGN(initrd_end, PAGE_SIZE); 103 #else 104 return 0; 105 #endif 106 } 107 108 /** 109 * move_device_tree - move tree to an unused area, if needed. 110 * 111 * The device tree may be allocated beyond our memory limit, or inside the 112 * crash kernel region for kdump, or within the page aligned range of initrd. 113 * If so, move it out of the way. 114 */ 115 static void __init move_device_tree(void) 116 { 117 unsigned long start, size; 118 void *p; 119 120 DBG("-> move_device_tree\n"); 121 122 start = __pa(initial_boot_params); 123 size = fdt_totalsize(initial_boot_params); 124 125 if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) || 126 !memblock_is_memory(start + size - 1) || 127 overlaps_crashkernel(start, size) || overlaps_initrd(start, size)) { 128 p = memblock_alloc_raw(size, PAGE_SIZE); 129 if (!p) 130 panic("Failed to allocate %lu bytes to move device tree\n", 131 size); 132 memcpy(p, initial_boot_params, size); 133 initial_boot_params = p; 134 DBG("Moved device tree to 0x%px\n", p); 135 } 136 137 DBG("<- move_device_tree\n"); 138 } 139 140 /* 141 * ibm,pa-features is a per-cpu property that contains a string of 142 * attribute descriptors, each of which has a 2 byte header plus up 143 * to 254 bytes worth of processor attribute bits. First header 144 * byte specifies the number of bytes following the header. 145 * Second header byte is an "attribute-specifier" type, of which 146 * zero is the only currently-defined value. 147 * Implementation: Pass in the byte and bit offset for the feature 148 * that we are interested in. The function will return -1 if the 149 * pa-features property is missing, or a 1/0 to indicate if the feature 150 * is supported/not supported. Note that the bit numbers are 151 * big-endian to match the definition in PAPR. 152 */ 153 static struct ibm_pa_feature { 154 unsigned long cpu_features; /* CPU_FTR_xxx bit */ 155 unsigned long mmu_features; /* MMU_FTR_xxx bit */ 156 unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */ 157 unsigned int cpu_user_ftrs2; /* PPC_FEATURE2_xxx bit */ 158 unsigned char pabyte; /* byte number in ibm,pa-features */ 159 unsigned char pabit; /* bit number (big-endian) */ 160 unsigned char invert; /* if 1, pa bit set => clear feature */ 161 } ibm_pa_features[] __initdata = { 162 { .pabyte = 0, .pabit = 0, .cpu_user_ftrs = PPC_FEATURE_HAS_MMU }, 163 { .pabyte = 0, .pabit = 1, .cpu_user_ftrs = PPC_FEATURE_HAS_FPU }, 164 { .pabyte = 0, .pabit = 3, .cpu_features = CPU_FTR_CTRL }, 165 { .pabyte = 0, .pabit = 6, .cpu_features = CPU_FTR_NOEXECUTE }, 166 { .pabyte = 1, .pabit = 2, .mmu_features = MMU_FTR_CI_LARGE_PAGE }, 167 #ifdef CONFIG_PPC_RADIX_MMU 168 { .pabyte = 40, .pabit = 0, .mmu_features = MMU_FTR_TYPE_RADIX | MMU_FTR_GTSE }, 169 #endif 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 { .pabyte = 64, .pabit = 0, .cpu_features = CPU_FTR_DAWR1 }, 181 }; 182 183 static void __init scan_features(unsigned long node, const unsigned char *ftrs, 184 unsigned long tablelen, 185 struct ibm_pa_feature *fp, 186 unsigned long ft_size) 187 { 188 unsigned long i, len, bit; 189 190 /* find descriptor with type == 0 */ 191 for (;;) { 192 if (tablelen < 3) 193 return; 194 len = 2 + ftrs[0]; 195 if (tablelen < len) 196 return; /* descriptor 0 not found */ 197 if (ftrs[1] == 0) 198 break; 199 tablelen -= len; 200 ftrs += len; 201 } 202 203 /* loop over bits we know about */ 204 for (i = 0; i < ft_size; ++i, ++fp) { 205 if (fp->pabyte >= ftrs[0]) 206 continue; 207 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; 208 if (bit ^ fp->invert) { 209 cur_cpu_spec->cpu_features |= fp->cpu_features; 210 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; 211 cur_cpu_spec->cpu_user_features2 |= fp->cpu_user_ftrs2; 212 cur_cpu_spec->mmu_features |= fp->mmu_features; 213 } else { 214 cur_cpu_spec->cpu_features &= ~fp->cpu_features; 215 cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs; 216 cur_cpu_spec->cpu_user_features2 &= ~fp->cpu_user_ftrs2; 217 cur_cpu_spec->mmu_features &= ~fp->mmu_features; 218 } 219 } 220 } 221 222 static void __init check_cpu_pa_features(unsigned long node) 223 { 224 const unsigned char *pa_ftrs; 225 int tablelen; 226 227 pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); 228 if (pa_ftrs == NULL) 229 return; 230 231 scan_features(node, pa_ftrs, tablelen, 232 ibm_pa_features, ARRAY_SIZE(ibm_pa_features)); 233 } 234 235 #ifdef CONFIG_PPC_BOOK3S_64 236 static void __init init_mmu_slb_size(unsigned long node) 237 { 238 const __be32 *slb_size_ptr; 239 240 slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? : 241 of_get_flat_dt_prop(node, "ibm,slb-size", NULL); 242 243 if (slb_size_ptr) 244 mmu_slb_size = be32_to_cpup(slb_size_ptr); 245 } 246 #else 247 #define init_mmu_slb_size(node) do { } while(0) 248 #endif 249 250 static struct feature_property { 251 const char *name; 252 u32 min_value; 253 unsigned long cpu_feature; 254 unsigned long cpu_user_ftr; 255 } feature_properties[] __initdata = { 256 #ifdef CONFIG_ALTIVEC 257 {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, 258 {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, 259 #endif /* CONFIG_ALTIVEC */ 260 #ifdef CONFIG_VSX 261 /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */ 262 {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX}, 263 #endif /* CONFIG_VSX */ 264 #ifdef CONFIG_PPC64 265 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP}, 266 {"ibm,purr", 1, CPU_FTR_PURR, 0}, 267 {"ibm,spurr", 1, CPU_FTR_SPURR, 0}, 268 #endif /* CONFIG_PPC64 */ 269 }; 270 271 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU) 272 static __init void identical_pvr_fixup(unsigned long node) 273 { 274 unsigned int pvr; 275 const char *model = of_get_flat_dt_prop(node, "model", NULL); 276 277 /* 278 * Since 440GR(x)/440EP(x) processors have the same pvr, 279 * we check the node path and set bit 28 in the cur_cpu_spec 280 * pvr for EP(x) processor version. This bit is always 0 in 281 * the "real" pvr. Then we call identify_cpu again with 282 * the new logical pvr to enable FPU support. 283 */ 284 if (model && strstr(model, "440EP")) { 285 pvr = cur_cpu_spec->pvr_value | 0x8; 286 identify_cpu(0, pvr); 287 DBG("Using logical pvr %x for %s\n", pvr, model); 288 } 289 } 290 #else 291 #define identical_pvr_fixup(node) do { } while(0) 292 #endif 293 294 static void __init check_cpu_feature_properties(unsigned long node) 295 { 296 int i; 297 struct feature_property *fp = feature_properties; 298 const __be32 *prop; 299 300 for (i = 0; i < (int)ARRAY_SIZE(feature_properties); ++i, ++fp) { 301 prop = of_get_flat_dt_prop(node, fp->name, NULL); 302 if (prop && be32_to_cpup(prop) >= fp->min_value) { 303 cur_cpu_spec->cpu_features |= fp->cpu_feature; 304 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr; 305 } 306 } 307 } 308 309 static int __init early_init_dt_scan_cpus(unsigned long node, 310 const char *uname, int depth, 311 void *data) 312 { 313 const char *type = of_get_flat_dt_prop(node, "device_type", NULL); 314 const __be32 *prop; 315 const __be32 *intserv; 316 int i, nthreads; 317 int len; 318 int found = -1; 319 int found_thread = 0; 320 321 /* We are scanning "cpu" nodes only */ 322 if (type == NULL || strcmp(type, "cpu") != 0) 323 return 0; 324 325 /* Get physical cpuid */ 326 intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len); 327 if (!intserv) 328 intserv = of_get_flat_dt_prop(node, "reg", &len); 329 330 nthreads = len / sizeof(int); 331 332 /* 333 * Now see if any of these threads match our boot cpu. 334 * NOTE: This must match the parsing done in smp_setup_cpu_maps. 335 */ 336 for (i = 0; i < nthreads; i++) { 337 if (be32_to_cpu(intserv[i]) == 338 fdt_boot_cpuid_phys(initial_boot_params)) { 339 found = boot_cpu_count; 340 found_thread = i; 341 } 342 #ifdef CONFIG_SMP 343 /* logical cpu id is always 0 on UP kernels */ 344 boot_cpu_count++; 345 #endif 346 } 347 348 /* Not the boot CPU */ 349 if (found < 0) 350 return 0; 351 352 DBG("boot cpu: logical %d physical %d\n", found, 353 be32_to_cpu(intserv[found_thread])); 354 boot_cpuid = found; 355 356 /* 357 * PAPR defines "logical" PVR values for cpus that 358 * meet various levels of the architecture: 359 * 0x0f000001 Architecture version 2.04 360 * 0x0f000002 Architecture version 2.05 361 * If the cpu-version property in the cpu node contains 362 * such a value, we call identify_cpu again with the 363 * logical PVR value in order to use the cpu feature 364 * bits appropriate for the architecture level. 365 * 366 * A POWER6 partition in "POWER6 architected" mode 367 * uses the 0x0f000002 PVR value; in POWER5+ mode 368 * it uses 0x0f000001. 369 * 370 * If we're using device tree CPU feature discovery then we don't 371 * support the cpu-version property, and it's the responsibility of the 372 * firmware/hypervisor to provide the correct feature set for the 373 * architecture level via the ibm,powerpc-cpu-features binding. 374 */ 375 if (!dt_cpu_ftrs_in_use()) { 376 prop = of_get_flat_dt_prop(node, "cpu-version", NULL); 377 if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000) 378 identify_cpu(0, be32_to_cpup(prop)); 379 380 check_cpu_feature_properties(node); 381 check_cpu_pa_features(node); 382 } 383 384 identical_pvr_fixup(node); 385 init_mmu_slb_size(node); 386 387 #ifdef CONFIG_PPC64 388 if (nthreads == 1) 389 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; 390 else if (!dt_cpu_ftrs_in_use()) 391 cur_cpu_spec->cpu_features |= CPU_FTR_SMT; 392 allocate_paca(boot_cpuid); 393 #endif 394 set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread])); 395 396 return 0; 397 } 398 399 static int __init early_init_dt_scan_chosen_ppc(unsigned long node, 400 const char *uname, 401 int depth, void *data) 402 { 403 const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */ 404 405 /* Use common scan routine to determine if this is the chosen node */ 406 if (early_init_dt_scan_chosen(node, uname, depth, data) == 0) 407 return 0; 408 409 #ifdef CONFIG_PPC64 410 /* check if iommu is forced on or off */ 411 if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) 412 iommu_is_off = 1; 413 if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) 414 iommu_force_on = 1; 415 #endif 416 417 /* mem=x on the command line is the preferred mechanism */ 418 lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); 419 if (lprop) 420 memory_limit = *lprop; 421 422 #ifdef CONFIG_PPC64 423 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); 424 if (lprop) 425 tce_alloc_start = *lprop; 426 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); 427 if (lprop) 428 tce_alloc_end = *lprop; 429 #endif 430 431 #ifdef CONFIG_KEXEC_CORE 432 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); 433 if (lprop) 434 crashk_res.start = *lprop; 435 436 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); 437 if (lprop) 438 crashk_res.end = crashk_res.start + *lprop - 1; 439 #endif 440 441 /* break now */ 442 return 1; 443 } 444 445 /* 446 * Compare the range against max mem limit and update 447 * size if it cross the limit. 448 */ 449 450 #ifdef CONFIG_SPARSEMEM 451 static bool validate_mem_limit(u64 base, u64 *size) 452 { 453 u64 max_mem = 1UL << (MAX_PHYSMEM_BITS); 454 455 if (base >= max_mem) 456 return false; 457 if ((base + *size) > max_mem) 458 *size = max_mem - base; 459 return true; 460 } 461 #else 462 static bool validate_mem_limit(u64 base, u64 *size) 463 { 464 return true; 465 } 466 #endif 467 468 #ifdef CONFIG_PPC_PSERIES 469 /* 470 * Interpret the ibm dynamic reconfiguration memory LMBs. 471 * This contains a list of memory blocks along with NUMA affinity 472 * information. 473 */ 474 static int __init early_init_drmem_lmb(struct drmem_lmb *lmb, 475 const __be32 **usm, 476 void *data) 477 { 478 u64 base, size; 479 int is_kexec_kdump = 0, rngs; 480 481 base = lmb->base_addr; 482 size = drmem_lmb_size(); 483 rngs = 1; 484 485 /* 486 * Skip this block if the reserved bit is set in flags 487 * or if the block is not assigned to this partition. 488 */ 489 if ((lmb->flags & DRCONF_MEM_RESERVED) || 490 !(lmb->flags & DRCONF_MEM_ASSIGNED)) 491 return 0; 492 493 if (*usm) 494 is_kexec_kdump = 1; 495 496 if (is_kexec_kdump) { 497 /* 498 * For each memblock in ibm,dynamic-memory, a 499 * corresponding entry in linux,drconf-usable-memory 500 * property contains a counter 'p' followed by 'p' 501 * (base, size) duple. Now read the counter from 502 * linux,drconf-usable-memory property 503 */ 504 rngs = dt_mem_next_cell(dt_root_size_cells, usm); 505 if (!rngs) /* there are no (base, size) duple */ 506 return 0; 507 } 508 509 do { 510 if (is_kexec_kdump) { 511 base = dt_mem_next_cell(dt_root_addr_cells, usm); 512 size = dt_mem_next_cell(dt_root_size_cells, usm); 513 } 514 515 if (iommu_is_off) { 516 if (base >= 0x80000000ul) 517 continue; 518 if ((base + size) > 0x80000000ul) 519 size = 0x80000000ul - base; 520 } 521 522 if (!validate_mem_limit(base, &size)) 523 continue; 524 525 DBG("Adding: %llx -> %llx\n", base, size); 526 memblock_add(base, size); 527 528 if (lmb->flags & DRCONF_MEM_HOTREMOVABLE) 529 memblock_mark_hotplug(base, size); 530 } while (--rngs); 531 532 return 0; 533 } 534 #endif /* CONFIG_PPC_PSERIES */ 535 536 static int __init early_init_dt_scan_memory_ppc(unsigned long node, 537 const char *uname, 538 int depth, void *data) 539 { 540 #ifdef CONFIG_PPC_PSERIES 541 if (depth == 1 && 542 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) { 543 walk_drmem_lmbs_early(node, NULL, early_init_drmem_lmb); 544 return 0; 545 } 546 #endif 547 548 return early_init_dt_scan_memory(node, uname, depth, data); 549 } 550 551 /* 552 * For a relocatable kernel, we need to get the memstart_addr first, 553 * then use it to calculate the virtual kernel start address. This has 554 * to happen at a very early stage (before machine_init). In this case, 555 * we just want to get the memstart_address and would not like to mess the 556 * memblock at this stage. So introduce a variable to skip the memblock_add() 557 * for this reason. 558 */ 559 #ifdef CONFIG_RELOCATABLE 560 static int add_mem_to_memblock = 1; 561 #else 562 #define add_mem_to_memblock 1 563 #endif 564 565 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 566 { 567 #ifdef CONFIG_PPC64 568 if (iommu_is_off) { 569 if (base >= 0x80000000ul) 570 return; 571 if ((base + size) > 0x80000000ul) 572 size = 0x80000000ul - base; 573 } 574 #endif 575 /* Keep track of the beginning of memory -and- the size of 576 * the very first block in the device-tree as it represents 577 * the RMA on ppc64 server 578 */ 579 if (base < memstart_addr) { 580 memstart_addr = base; 581 first_memblock_size = size; 582 } 583 584 /* Add the chunk to the MEMBLOCK list */ 585 if (add_mem_to_memblock) { 586 if (validate_mem_limit(base, &size)) 587 memblock_add(base, size); 588 } 589 } 590 591 static void __init early_reserve_mem_dt(void) 592 { 593 unsigned long i, dt_root; 594 int len; 595 const __be32 *prop; 596 597 early_init_fdt_reserve_self(); 598 early_init_fdt_scan_reserved_mem(); 599 600 dt_root = of_get_flat_dt_root(); 601 602 prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len); 603 604 if (!prop) 605 return; 606 607 DBG("Found new-style reserved-ranges\n"); 608 609 /* Each reserved range is an (address,size) pair, 2 cells each, 610 * totalling 4 cells per range. */ 611 for (i = 0; i < len / (sizeof(*prop) * 4); i++) { 612 u64 base, size; 613 614 base = of_read_number(prop + (i * 4) + 0, 2); 615 size = of_read_number(prop + (i * 4) + 2, 2); 616 617 if (size) { 618 DBG("reserving: %llx -> %llx\n", base, size); 619 memblock_reserve(base, size); 620 } 621 } 622 } 623 624 static void __init early_reserve_mem(void) 625 { 626 __be64 *reserve_map; 627 628 reserve_map = (__be64 *)(((unsigned long)initial_boot_params) + 629 fdt_off_mem_rsvmap(initial_boot_params)); 630 631 /* Look for the new "reserved-regions" property in the DT */ 632 early_reserve_mem_dt(); 633 634 #ifdef CONFIG_BLK_DEV_INITRD 635 /* Then reserve the initrd, if any */ 636 if (initrd_start && (initrd_end > initrd_start)) { 637 memblock_reserve(ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE), 638 ALIGN(initrd_end, PAGE_SIZE) - 639 ALIGN_DOWN(initrd_start, PAGE_SIZE)); 640 } 641 #endif /* CONFIG_BLK_DEV_INITRD */ 642 643 #ifdef CONFIG_PPC32 644 /* 645 * Handle the case where we might be booting from an old kexec 646 * image that setup the mem_rsvmap as pairs of 32-bit values 647 */ 648 if (be64_to_cpup(reserve_map) > 0xffffffffull) { 649 u32 base_32, size_32; 650 __be32 *reserve_map_32 = (__be32 *)reserve_map; 651 652 DBG("Found old 32-bit reserve map\n"); 653 654 while (1) { 655 base_32 = be32_to_cpup(reserve_map_32++); 656 size_32 = be32_to_cpup(reserve_map_32++); 657 if (size_32 == 0) 658 break; 659 DBG("reserving: %x -> %x\n", base_32, size_32); 660 memblock_reserve(base_32, size_32); 661 } 662 return; 663 } 664 #endif 665 } 666 667 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 668 static bool tm_disabled __initdata; 669 670 static int __init parse_ppc_tm(char *str) 671 { 672 bool res; 673 674 if (kstrtobool(str, &res)) 675 return -EINVAL; 676 677 tm_disabled = !res; 678 679 return 0; 680 } 681 early_param("ppc_tm", parse_ppc_tm); 682 683 static void __init tm_init(void) 684 { 685 if (tm_disabled) { 686 pr_info("Disabling hardware transactional memory (HTM)\n"); 687 cur_cpu_spec->cpu_user_features2 &= 688 ~(PPC_FEATURE2_HTM_NOSC | PPC_FEATURE2_HTM); 689 cur_cpu_spec->cpu_features &= ~CPU_FTR_TM; 690 return; 691 } 692 693 pnv_tm_init(); 694 } 695 #else 696 static void tm_init(void) { } 697 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ 698 699 #ifdef CONFIG_PPC64 700 static void __init save_fscr_to_task(void) 701 { 702 /* 703 * Ensure the init_task (pid 0, aka swapper) uses the value of FSCR we 704 * have configured via the device tree features or via __init_FSCR(). 705 * That value will then be propagated to pid 1 (init) and all future 706 * processes. 707 */ 708 if (early_cpu_has_feature(CPU_FTR_ARCH_207S)) 709 init_task.thread.fscr = mfspr(SPRN_FSCR); 710 } 711 #else 712 static inline void save_fscr_to_task(void) {} 713 #endif 714 715 716 void __init early_init_devtree(void *params) 717 { 718 phys_addr_t limit; 719 720 DBG(" -> early_init_devtree(%px)\n", params); 721 722 /* Too early to BUG_ON(), do it by hand */ 723 if (!early_init_dt_verify(params)) 724 panic("BUG: Failed verifying flat device tree, bad version?"); 725 726 #ifdef CONFIG_PPC_RTAS 727 /* Some machines might need RTAS info for debugging, grab it now. */ 728 of_scan_flat_dt(early_init_dt_scan_rtas, NULL); 729 #endif 730 731 #ifdef CONFIG_PPC_POWERNV 732 /* Some machines might need OPAL info for debugging, grab it now. */ 733 of_scan_flat_dt(early_init_dt_scan_opal, NULL); 734 735 /* Scan tree for ultravisor feature */ 736 of_scan_flat_dt(early_init_dt_scan_ultravisor, NULL); 737 #endif 738 739 #if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP) 740 /* scan tree to see if dump is active during last boot */ 741 of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL); 742 #endif 743 744 /* Retrieve various informations from the /chosen node of the 745 * device-tree, including the platform type, initrd location and 746 * size, TCE reserve, and more ... 747 */ 748 of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line); 749 750 /* Scan memory nodes and rebuild MEMBLOCKs */ 751 of_scan_flat_dt(early_init_dt_scan_root, NULL); 752 of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); 753 754 parse_early_param(); 755 756 /* make sure we've parsed cmdline for mem= before this */ 757 if (memory_limit) 758 first_memblock_size = min_t(u64, first_memblock_size, memory_limit); 759 setup_initial_memory_limit(memstart_addr, first_memblock_size); 760 /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */ 761 memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); 762 /* If relocatable, reserve first 32k for interrupt vectors etc. */ 763 if (PHYSICAL_START > MEMORY_START) 764 memblock_reserve(MEMORY_START, 0x8000); 765 reserve_kdump_trampoline(); 766 #if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP) 767 /* 768 * If we fail to reserve memory for firmware-assisted dump then 769 * fallback to kexec based kdump. 770 */ 771 if (fadump_reserve_mem() == 0) 772 #endif 773 reserve_crashkernel(); 774 early_reserve_mem(); 775 776 /* Ensure that total memory size is page-aligned. */ 777 limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE); 778 memblock_enforce_memory_limit(limit); 779 780 #if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_4K_PAGES) 781 if (!early_radix_enabled()) 782 memblock_cap_memory_range(0, 1UL << (H_MAX_PHYSMEM_BITS)); 783 #endif 784 785 memblock_allow_resize(); 786 memblock_dump_all(); 787 788 DBG("Phys. mem: %llx\n", (unsigned long long)memblock_phys_mem_size()); 789 790 /* We may need to relocate the flat tree, do it now. 791 * FIXME .. and the initrd too? */ 792 move_device_tree(); 793 794 allocate_paca_ptrs(); 795 796 DBG("Scanning CPUs ...\n"); 797 798 dt_cpu_ftrs_scan(); 799 800 /* Retrieve CPU related informations from the flat tree 801 * (altivec support, boot CPU ID, ...) 802 */ 803 of_scan_flat_dt(early_init_dt_scan_cpus, NULL); 804 if (boot_cpuid < 0) { 805 printk("Failed to identify boot CPU !\n"); 806 BUG(); 807 } 808 809 save_fscr_to_task(); 810 811 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64) 812 /* We'll later wait for secondaries to check in; there are 813 * NCPUS-1 non-boot CPUs :-) 814 */ 815 spinning_secondaries = boot_cpu_count - 1; 816 #endif 817 818 mmu_early_init_devtree(); 819 820 #ifdef CONFIG_PPC_POWERNV 821 /* Scan and build the list of machine check recoverable ranges */ 822 of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL); 823 #endif 824 epapr_paravirt_early_init(); 825 826 /* Now try to figure out if we are running on LPAR and so on */ 827 pseries_probe_fw_features(); 828 829 /* 830 * Initialize pkey features and default AMR/IAMR values 831 */ 832 pkey_early_init_devtree(); 833 834 #ifdef CONFIG_PPC_PS3 835 /* Identify PS3 firmware */ 836 if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3")) 837 powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE; 838 #endif 839 840 tm_init(); 841 842 DBG(" <- early_init_devtree()\n"); 843 } 844 845 #ifdef CONFIG_RELOCATABLE 846 /* 847 * This function run before early_init_devtree, so we have to init 848 * initial_boot_params. 849 */ 850 void __init early_get_first_memblock_info(void *params, phys_addr_t *size) 851 { 852 /* Setup flat device-tree pointer */ 853 initial_boot_params = params; 854 855 /* 856 * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid 857 * mess the memblock. 858 */ 859 add_mem_to_memblock = 0; 860 of_scan_flat_dt(early_init_dt_scan_root, NULL); 861 of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); 862 add_mem_to_memblock = 1; 863 864 if (size) 865 *size = first_memblock_size; 866 } 867 #endif 868 869 /******* 870 * 871 * New implementation of the OF "find" APIs, return a refcounted 872 * object, call of_node_put() when done. The device tree and list 873 * are protected by a rw_lock. 874 * 875 * Note that property management will need some locking as well, 876 * this isn't dealt with yet. 877 * 878 *******/ 879 880 /** 881 * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device 882 * @np: device node of the device 883 * 884 * This looks for a property "ibm,chip-id" in the node or any 885 * of its parents and returns its content, or -1 if it cannot 886 * be found. 887 */ 888 int of_get_ibm_chip_id(struct device_node *np) 889 { 890 of_node_get(np); 891 while (np) { 892 u32 chip_id; 893 894 /* 895 * Skiboot may produce memory nodes that contain more than one 896 * cell in chip-id, we only read the first one here. 897 */ 898 if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) { 899 of_node_put(np); 900 return chip_id; 901 } 902 903 np = of_get_next_parent(np); 904 } 905 return -1; 906 } 907 EXPORT_SYMBOL(of_get_ibm_chip_id); 908 909 /** 910 * cpu_to_chip_id - Return the cpus chip-id 911 * @cpu: The logical cpu number. 912 * 913 * Return the value of the ibm,chip-id property corresponding to the given 914 * logical cpu number. If the chip-id can not be found, returns -1. 915 */ 916 int cpu_to_chip_id(int cpu) 917 { 918 struct device_node *np; 919 int ret = -1, idx; 920 921 idx = cpu / threads_per_core; 922 if (chip_id_lookup_table && chip_id_lookup_table[idx] != -1) 923 return chip_id_lookup_table[idx]; 924 925 np = of_get_cpu_node(cpu, NULL); 926 if (np) { 927 ret = of_get_ibm_chip_id(np); 928 of_node_put(np); 929 930 if (chip_id_lookup_table) 931 chip_id_lookup_table[idx] = ret; 932 } 933 934 return ret; 935 } 936 EXPORT_SYMBOL(cpu_to_chip_id); 937 938 bool arch_match_cpu_phys_id(int cpu, u64 phys_id) 939 { 940 #ifdef CONFIG_SMP 941 /* 942 * Early firmware scanning must use this rather than 943 * get_hard_smp_processor_id because we don't have pacas allocated 944 * until memory topology is discovered. 945 */ 946 if (cpu_to_phys_id != NULL) 947 return (int)phys_id == cpu_to_phys_id[cpu]; 948 #endif 949 950 return (int)phys_id == get_hard_smp_processor_id(cpu); 951 } 952