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 <linux/kernel.h> 15 #include <linux/string.h> 16 #include <linux/init.h> 17 #include <linux/threads.h> 18 #include <linux/spinlock.h> 19 #include <linux/types.h> 20 #include <linux/pci.h> 21 #include <linux/delay.h> 22 #include <linux/initrd.h> 23 #include <linux/bitops.h> 24 #include <linux/export.h> 25 #include <linux/kexec.h> 26 #include <linux/irq.h> 27 #include <linux/memblock.h> 28 #include <linux/of.h> 29 #include <linux/of_fdt.h> 30 #include <linux/libfdt.h> 31 #include <linux/cpu.h> 32 #include <linux/pgtable.h> 33 #include <linux/seq_buf.h> 34 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/powernv.h> 45 #include <asm/iommu.h> 46 #include <asm/btext.h> 47 #include <asm/sections.h> 48 #include <asm/setup.h> 49 #include <asm/pci-bridge.h> 50 #include <asm/kexec.h> 51 #include <asm/opal.h> 52 #include <asm/fadump.h> 53 #include <asm/epapr_hcalls.h> 54 #include <asm/firmware.h> 55 #include <asm/dt_cpu_ftrs.h> 56 #include <asm/drmem.h> 57 #include <asm/ultravisor.h> 58 #include <asm/prom.h> 59 #include <asm/plpks.h> 60 61 #include <mm/mmu_decl.h> 62 63 #ifdef DEBUG 64 #define DBG(fmt...) printk(KERN_ERR fmt) 65 #else 66 #define DBG(fmt...) 67 #endif 68 69 int *chip_id_lookup_table; 70 71 #ifdef CONFIG_PPC64 72 int __initdata iommu_is_off; 73 int __initdata iommu_force_on; 74 unsigned long tce_alloc_start, tce_alloc_end; 75 u64 ppc64_rma_size; 76 unsigned int boot_cpu_node_count __ro_after_init; 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(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 !memblock_is_memory(start + size - 1) || 129 overlaps_crashkernel(start, size) || overlaps_initrd(start, size)) { 130 p = memblock_alloc_raw(size, PAGE_SIZE); 131 if (!p) 132 panic("Failed to allocate %lu bytes to move device tree\n", 133 size); 134 memcpy(p, initial_boot_params, size); 135 initial_boot_params = p; 136 DBG("Moved device tree to 0x%px\n", p); 137 } 138 139 DBG("<- move_device_tree\n"); 140 } 141 142 /* 143 * ibm,pa/pi-features is a per-cpu property that contains a string of 144 * attribute descriptors, each of which has a 2 byte header plus up 145 * to 254 bytes worth of processor attribute bits. First header 146 * byte specifies the number of bytes following the header. 147 * Second header byte is an "attribute-specifier" type, of which 148 * zero is the only currently-defined value. 149 * Implementation: Pass in the byte and bit offset for the feature 150 * that we are interested in. The function will return -1 if the 151 * pa-features property is missing, or a 1/0 to indicate if the feature 152 * is supported/not supported. Note that the bit numbers are 153 * big-endian to match the definition in PAPR. 154 */ 155 struct ibm_feature { 156 unsigned long cpu_features; /* CPU_FTR_xxx bit */ 157 unsigned long mmu_features; /* MMU_FTR_xxx bit */ 158 unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */ 159 unsigned int cpu_user_ftrs2; /* PPC_FEATURE2_xxx bit */ 160 unsigned char pabyte; /* byte number in ibm,pa/pi-features */ 161 unsigned char pabit; /* bit number (big-endian) */ 162 unsigned char invert; /* if 1, pa bit set => clear feature */ 163 }; 164 165 static struct ibm_feature ibm_pa_features[] __initdata = { 166 { .pabyte = 0, .pabit = 0, .cpu_user_ftrs = PPC_FEATURE_HAS_MMU }, 167 { .pabyte = 0, .pabit = 1, .cpu_user_ftrs = PPC_FEATURE_HAS_FPU }, 168 { .pabyte = 0, .pabit = 3, .cpu_features = CPU_FTR_CTRL }, 169 { .pabyte = 0, .pabit = 6, .cpu_features = CPU_FTR_NOEXECUTE }, 170 { .pabyte = 1, .pabit = 2, .mmu_features = MMU_FTR_CI_LARGE_PAGE }, 171 #ifdef CONFIG_PPC_RADIX_MMU 172 { .pabyte = 40, .pabit = 0, .mmu_features = MMU_FTR_TYPE_RADIX | MMU_FTR_GTSE }, 173 #endif 174 { .pabyte = 5, .pabit = 0, .cpu_features = CPU_FTR_REAL_LE, 175 .cpu_user_ftrs = PPC_FEATURE_TRUE_LE }, 176 /* 177 * If the kernel doesn't support TM (ie CONFIG_PPC_TRANSACTIONAL_MEM=n), 178 * we don't want to turn on TM here, so we use the *_COMP versions 179 * which are 0 if the kernel doesn't support TM. 180 */ 181 { .pabyte = 22, .pabit = 0, .cpu_features = CPU_FTR_TM_COMP, 182 .cpu_user_ftrs2 = PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_HTM_NOSC_COMP }, 183 184 { .pabyte = 64, .pabit = 0, .cpu_features = CPU_FTR_DAWR1 }, 185 { .pabyte = 68, .pabit = 5, .cpu_features = CPU_FTR_DEXCR_NPHIE }, 186 }; 187 188 /* 189 * ibm,pi-features property provides the support of processor specific 190 * options not described in ibm,pa-features. Right now use byte 0, bit 3 191 * which indicates the occurrence of DSI interrupt when the paste operation 192 * on the suspended NX window. 193 */ 194 static struct ibm_feature ibm_pi_features[] __initdata = { 195 { .pabyte = 0, .pabit = 3, .mmu_features = MMU_FTR_NX_DSI }, 196 }; 197 198 static void __init scan_features(unsigned long node, const unsigned char *ftrs, 199 unsigned long tablelen, 200 struct ibm_feature *fp, 201 unsigned long ft_size) 202 { 203 unsigned long i, len, bit; 204 205 /* find descriptor with type == 0 */ 206 for (;;) { 207 if (tablelen < 3) 208 return; 209 len = 2 + ftrs[0]; 210 if (tablelen < len) 211 return; /* descriptor 0 not found */ 212 if (ftrs[1] == 0) 213 break; 214 tablelen -= len; 215 ftrs += len; 216 } 217 218 /* loop over bits we know about */ 219 for (i = 0; i < ft_size; ++i, ++fp) { 220 if (fp->pabyte >= ftrs[0]) 221 continue; 222 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; 223 if (bit ^ fp->invert) { 224 cur_cpu_spec->cpu_features |= fp->cpu_features; 225 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; 226 cur_cpu_spec->cpu_user_features2 |= fp->cpu_user_ftrs2; 227 cur_cpu_spec->mmu_features |= fp->mmu_features; 228 } else { 229 cur_cpu_spec->cpu_features &= ~fp->cpu_features; 230 cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs; 231 cur_cpu_spec->cpu_user_features2 &= ~fp->cpu_user_ftrs2; 232 cur_cpu_spec->mmu_features &= ~fp->mmu_features; 233 } 234 } 235 } 236 237 static void __init check_cpu_features(unsigned long node, char *name, 238 struct ibm_feature *fp, 239 unsigned long size) 240 { 241 const unsigned char *pa_ftrs; 242 int tablelen; 243 244 pa_ftrs = of_get_flat_dt_prop(node, name, &tablelen); 245 if (pa_ftrs == NULL) 246 return; 247 248 scan_features(node, pa_ftrs, tablelen, fp, size); 249 } 250 251 #ifdef CONFIG_PPC_64S_HASH_MMU 252 static void __init init_mmu_slb_size(unsigned long node) 253 { 254 const __be32 *slb_size_ptr; 255 256 slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? : 257 of_get_flat_dt_prop(node, "ibm,slb-size", NULL); 258 259 if (slb_size_ptr) 260 mmu_slb_size = be32_to_cpup(slb_size_ptr); 261 } 262 #else 263 #define init_mmu_slb_size(node) do { } while(0) 264 #endif 265 266 static struct feature_property { 267 const char *name; 268 u32 min_value; 269 unsigned long cpu_feature; 270 unsigned long cpu_user_ftr; 271 } feature_properties[] __initdata = { 272 #ifdef CONFIG_ALTIVEC 273 {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, 274 {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, 275 #endif /* CONFIG_ALTIVEC */ 276 #ifdef CONFIG_VSX 277 /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */ 278 {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX}, 279 #endif /* CONFIG_VSX */ 280 #ifdef CONFIG_PPC64 281 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP}, 282 {"ibm,purr", 1, CPU_FTR_PURR, 0}, 283 {"ibm,spurr", 1, CPU_FTR_SPURR, 0}, 284 #endif /* CONFIG_PPC64 */ 285 }; 286 287 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU) 288 static __init void identical_pvr_fixup(unsigned long node) 289 { 290 unsigned int pvr; 291 const char *model = of_get_flat_dt_prop(node, "model", NULL); 292 293 /* 294 * Since 440GR(x)/440EP(x) processors have the same pvr, 295 * we check the node path and set bit 28 in the cur_cpu_spec 296 * pvr for EP(x) processor version. This bit is always 0 in 297 * the "real" pvr. Then we call identify_cpu again with 298 * the new logical pvr to enable FPU support. 299 */ 300 if (model && strstr(model, "440EP")) { 301 pvr = cur_cpu_spec->pvr_value | 0x8; 302 identify_cpu(0, pvr); 303 DBG("Using logical pvr %x for %s\n", pvr, model); 304 } 305 } 306 #else 307 #define identical_pvr_fixup(node) do { } while(0) 308 #endif 309 310 static void __init check_cpu_feature_properties(unsigned long node) 311 { 312 int i; 313 struct feature_property *fp = feature_properties; 314 const __be32 *prop; 315 316 for (i = 0; i < (int)ARRAY_SIZE(feature_properties); ++i, ++fp) { 317 prop = of_get_flat_dt_prop(node, fp->name, NULL); 318 if (prop && be32_to_cpup(prop) >= fp->min_value) { 319 cur_cpu_spec->cpu_features |= fp->cpu_feature; 320 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr; 321 } 322 } 323 } 324 325 static int __init early_init_dt_scan_cpus(unsigned long node, 326 const char *uname, int depth, 327 void *data) 328 { 329 const char *type = of_get_flat_dt_prop(node, "device_type", NULL); 330 const __be32 *prop; 331 const __be32 *intserv; 332 int i, nthreads; 333 int len; 334 int found = -1; 335 int found_thread = 0; 336 337 /* We are scanning "cpu" nodes only */ 338 if (type == NULL || strcmp(type, "cpu") != 0) 339 return 0; 340 341 if (IS_ENABLED(CONFIG_PPC64)) 342 boot_cpu_node_count++; 343 344 /* Get physical cpuid */ 345 intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len); 346 if (!intserv) 347 intserv = of_get_flat_dt_prop(node, "reg", &len); 348 349 nthreads = len / sizeof(int); 350 351 /* 352 * Now see if any of these threads match our boot cpu. 353 * NOTE: This must match the parsing done in smp_setup_cpu_maps. 354 */ 355 for (i = 0; i < nthreads; i++) { 356 if (be32_to_cpu(intserv[i]) == 357 fdt_boot_cpuid_phys(initial_boot_params)) { 358 found = boot_cpu_count; 359 found_thread = i; 360 } 361 #ifdef CONFIG_SMP 362 /* logical cpu id is always 0 on UP kernels */ 363 boot_cpu_count++; 364 #endif 365 } 366 367 /* Not the boot CPU */ 368 if (found < 0) 369 return 0; 370 371 DBG("boot cpu: logical %d physical %d\n", found, 372 be32_to_cpu(intserv[found_thread])); 373 boot_cpuid = found; 374 375 if (IS_ENABLED(CONFIG_PPC64)) 376 boot_cpu_hwid = be32_to_cpu(intserv[found_thread]); 377 378 /* 379 * PAPR defines "logical" PVR values for cpus that 380 * meet various levels of the architecture: 381 * 0x0f000001 Architecture version 2.04 382 * 0x0f000002 Architecture version 2.05 383 * If the cpu-version property in the cpu node contains 384 * such a value, we call identify_cpu again with the 385 * logical PVR value in order to use the cpu feature 386 * bits appropriate for the architecture level. 387 * 388 * A POWER6 partition in "POWER6 architected" mode 389 * uses the 0x0f000002 PVR value; in POWER5+ mode 390 * it uses 0x0f000001. 391 * 392 * If we're using device tree CPU feature discovery then we don't 393 * support the cpu-version property, and it's the responsibility of the 394 * firmware/hypervisor to provide the correct feature set for the 395 * architecture level via the ibm,powerpc-cpu-features binding. 396 */ 397 if (!dt_cpu_ftrs_in_use()) { 398 prop = of_get_flat_dt_prop(node, "cpu-version", NULL); 399 if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000) { 400 identify_cpu(0, be32_to_cpup(prop)); 401 seq_buf_printf(&ppc_hw_desc, "0x%04x ", be32_to_cpup(prop)); 402 } 403 404 check_cpu_feature_properties(node); 405 check_cpu_features(node, "ibm,pa-features", ibm_pa_features, 406 ARRAY_SIZE(ibm_pa_features)); 407 check_cpu_features(node, "ibm,pi-features", ibm_pi_features, 408 ARRAY_SIZE(ibm_pi_features)); 409 } 410 411 identical_pvr_fixup(node); 412 init_mmu_slb_size(node); 413 414 #ifdef CONFIG_PPC64 415 if (nthreads == 1) 416 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; 417 else if (!dt_cpu_ftrs_in_use()) 418 cur_cpu_spec->cpu_features |= CPU_FTR_SMT; 419 #endif 420 421 return 0; 422 } 423 424 static int __init early_init_dt_scan_chosen_ppc(unsigned long node, 425 const char *uname, 426 int depth, void *data) 427 { 428 const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */ 429 430 /* Use common scan routine to determine if this is the chosen node */ 431 if (early_init_dt_scan_chosen(data) < 0) 432 return 0; 433 434 #ifdef CONFIG_PPC64 435 /* check if iommu is forced on or off */ 436 if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) 437 iommu_is_off = 1; 438 if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) 439 iommu_force_on = 1; 440 #endif 441 442 /* mem=x on the command line is the preferred mechanism */ 443 lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); 444 if (lprop) 445 memory_limit = *lprop; 446 447 #ifdef CONFIG_PPC64 448 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); 449 if (lprop) 450 tce_alloc_start = *lprop; 451 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); 452 if (lprop) 453 tce_alloc_end = *lprop; 454 #endif 455 456 #ifdef CONFIG_KEXEC_CORE 457 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); 458 if (lprop) 459 crashk_res.start = *lprop; 460 461 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); 462 if (lprop) 463 crashk_res.end = crashk_res.start + *lprop - 1; 464 #endif 465 466 /* break now */ 467 return 1; 468 } 469 470 /* 471 * Compare the range against max mem limit and update 472 * size if it cross the limit. 473 */ 474 475 #ifdef CONFIG_SPARSEMEM 476 static bool __init validate_mem_limit(u64 base, u64 *size) 477 { 478 u64 max_mem = 1UL << (MAX_PHYSMEM_BITS); 479 480 if (base >= max_mem) 481 return false; 482 if ((base + *size) > max_mem) 483 *size = max_mem - base; 484 return true; 485 } 486 #else 487 static bool __init validate_mem_limit(u64 base, u64 *size) 488 { 489 return true; 490 } 491 #endif 492 493 #ifdef CONFIG_PPC_PSERIES 494 /* 495 * Interpret the ibm dynamic reconfiguration memory LMBs. 496 * This contains a list of memory blocks along with NUMA affinity 497 * information. 498 */ 499 static int __init early_init_drmem_lmb(struct drmem_lmb *lmb, 500 const __be32 **usm, 501 void *data) 502 { 503 u64 base, size; 504 int is_kexec_kdump = 0, rngs; 505 506 base = lmb->base_addr; 507 size = drmem_lmb_size(); 508 rngs = 1; 509 510 /* 511 * Skip this block if the reserved bit is set in flags 512 * or if the block is not assigned to this partition. 513 */ 514 if ((lmb->flags & DRCONF_MEM_RESERVED) || 515 !(lmb->flags & DRCONF_MEM_ASSIGNED)) 516 return 0; 517 518 if (*usm) 519 is_kexec_kdump = 1; 520 521 if (is_kexec_kdump) { 522 /* 523 * For each memblock in ibm,dynamic-memory, a 524 * corresponding entry in linux,drconf-usable-memory 525 * property contains a counter 'p' followed by 'p' 526 * (base, size) duple. Now read the counter from 527 * linux,drconf-usable-memory property 528 */ 529 rngs = dt_mem_next_cell(dt_root_size_cells, usm); 530 if (!rngs) /* there are no (base, size) duple */ 531 return 0; 532 } 533 534 do { 535 if (is_kexec_kdump) { 536 base = dt_mem_next_cell(dt_root_addr_cells, usm); 537 size = dt_mem_next_cell(dt_root_size_cells, usm); 538 } 539 540 if (iommu_is_off) { 541 if (base >= 0x80000000ul) 542 continue; 543 if ((base + size) > 0x80000000ul) 544 size = 0x80000000ul - base; 545 } 546 547 if (!validate_mem_limit(base, &size)) 548 continue; 549 550 DBG("Adding: %llx -> %llx\n", base, size); 551 memblock_add(base, size); 552 553 if (lmb->flags & DRCONF_MEM_HOTREMOVABLE) 554 memblock_mark_hotplug(base, size); 555 } while (--rngs); 556 557 return 0; 558 } 559 #endif /* CONFIG_PPC_PSERIES */ 560 561 static int __init early_init_dt_scan_memory_ppc(void) 562 { 563 #ifdef CONFIG_PPC_PSERIES 564 const void *fdt = initial_boot_params; 565 int node = fdt_path_offset(fdt, "/ibm,dynamic-reconfiguration-memory"); 566 567 if (node > 0) 568 walk_drmem_lmbs_early(node, NULL, early_init_drmem_lmb); 569 570 #endif 571 572 return early_init_dt_scan_memory(); 573 } 574 575 /* 576 * For a relocatable kernel, we need to get the memstart_addr first, 577 * then use it to calculate the virtual kernel start address. This has 578 * to happen at a very early stage (before machine_init). In this case, 579 * we just want to get the memstart_address and would not like to mess the 580 * memblock at this stage. So introduce a variable to skip the memblock_add() 581 * for this reason. 582 */ 583 #ifdef CONFIG_RELOCATABLE 584 static int add_mem_to_memblock = 1; 585 #else 586 #define add_mem_to_memblock 1 587 #endif 588 589 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 590 { 591 #ifdef CONFIG_PPC64 592 if (iommu_is_off) { 593 if (base >= 0x80000000ul) 594 return; 595 if ((base + size) > 0x80000000ul) 596 size = 0x80000000ul - base; 597 } 598 #endif 599 /* Keep track of the beginning of memory -and- the size of 600 * the very first block in the device-tree as it represents 601 * the RMA on ppc64 server 602 */ 603 if (base < memstart_addr) { 604 memstart_addr = base; 605 first_memblock_size = size; 606 } 607 608 /* Add the chunk to the MEMBLOCK list */ 609 if (add_mem_to_memblock) { 610 if (validate_mem_limit(base, &size)) 611 memblock_add(base, size); 612 } 613 } 614 615 static void __init early_reserve_mem_dt(void) 616 { 617 unsigned long i, dt_root; 618 int len; 619 const __be32 *prop; 620 621 early_init_fdt_reserve_self(); 622 early_init_fdt_scan_reserved_mem(); 623 624 dt_root = of_get_flat_dt_root(); 625 626 prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len); 627 628 if (!prop) 629 return; 630 631 DBG("Found new-style reserved-ranges\n"); 632 633 /* Each reserved range is an (address,size) pair, 2 cells each, 634 * totalling 4 cells per range. */ 635 for (i = 0; i < len / (sizeof(*prop) * 4); i++) { 636 u64 base, size; 637 638 base = of_read_number(prop + (i * 4) + 0, 2); 639 size = of_read_number(prop + (i * 4) + 2, 2); 640 641 if (size) { 642 DBG("reserving: %llx -> %llx\n", base, size); 643 memblock_reserve(base, size); 644 } 645 } 646 } 647 648 static void __init early_reserve_mem(void) 649 { 650 __be64 *reserve_map; 651 652 reserve_map = (__be64 *)(((unsigned long)initial_boot_params) + 653 fdt_off_mem_rsvmap(initial_boot_params)); 654 655 /* Look for the new "reserved-regions" property in the DT */ 656 early_reserve_mem_dt(); 657 658 #ifdef CONFIG_BLK_DEV_INITRD 659 /* Then reserve the initrd, if any */ 660 if (initrd_start && (initrd_end > initrd_start)) { 661 memblock_reserve(ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE), 662 ALIGN(initrd_end, PAGE_SIZE) - 663 ALIGN_DOWN(initrd_start, PAGE_SIZE)); 664 } 665 #endif /* CONFIG_BLK_DEV_INITRD */ 666 667 if (!IS_ENABLED(CONFIG_PPC32)) 668 return; 669 670 /* 671 * Handle the case where we might be booting from an old kexec 672 * image that setup the mem_rsvmap as pairs of 32-bit values 673 */ 674 if (be64_to_cpup(reserve_map) > 0xffffffffull) { 675 u32 base_32, size_32; 676 __be32 *reserve_map_32 = (__be32 *)reserve_map; 677 678 DBG("Found old 32-bit reserve map\n"); 679 680 while (1) { 681 base_32 = be32_to_cpup(reserve_map_32++); 682 size_32 = be32_to_cpup(reserve_map_32++); 683 if (size_32 == 0) 684 break; 685 DBG("reserving: %x -> %x\n", base_32, size_32); 686 memblock_reserve(base_32, size_32); 687 } 688 return; 689 } 690 } 691 692 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 693 static bool tm_disabled __initdata; 694 695 static int __init parse_ppc_tm(char *str) 696 { 697 bool res; 698 699 if (kstrtobool(str, &res)) 700 return -EINVAL; 701 702 tm_disabled = !res; 703 704 return 0; 705 } 706 early_param("ppc_tm", parse_ppc_tm); 707 708 static void __init tm_init(void) 709 { 710 if (tm_disabled) { 711 pr_info("Disabling hardware transactional memory (HTM)\n"); 712 cur_cpu_spec->cpu_user_features2 &= 713 ~(PPC_FEATURE2_HTM_NOSC | PPC_FEATURE2_HTM); 714 cur_cpu_spec->cpu_features &= ~CPU_FTR_TM; 715 return; 716 } 717 718 pnv_tm_init(); 719 } 720 #else 721 static void tm_init(void) { } 722 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ 723 724 static int __init 725 early_init_dt_scan_model(unsigned long node, const char *uname, 726 int depth, void *data) 727 { 728 const char *prop; 729 730 if (depth != 0) 731 return 0; 732 733 prop = of_get_flat_dt_prop(node, "model", NULL); 734 if (prop) 735 seq_buf_printf(&ppc_hw_desc, "%s ", prop); 736 737 /* break now */ 738 return 1; 739 } 740 741 #ifdef CONFIG_PPC64 742 static void __init save_fscr_to_task(void) 743 { 744 /* 745 * Ensure the init_task (pid 0, aka swapper) uses the value of FSCR we 746 * have configured via the device tree features or via __init_FSCR(). 747 * That value will then be propagated to pid 1 (init) and all future 748 * processes. 749 */ 750 if (early_cpu_has_feature(CPU_FTR_ARCH_207S)) 751 init_task.thread.fscr = mfspr(SPRN_FSCR); 752 } 753 #else 754 static inline void save_fscr_to_task(void) {} 755 #endif 756 757 758 void __init early_init_devtree(void *params) 759 { 760 phys_addr_t limit; 761 762 DBG(" -> early_init_devtree(%px)\n", params); 763 764 /* Too early to BUG_ON(), do it by hand */ 765 if (!early_init_dt_verify(params)) 766 panic("BUG: Failed verifying flat device tree, bad version?"); 767 768 of_scan_flat_dt(early_init_dt_scan_model, NULL); 769 770 #ifdef CONFIG_PPC_RTAS 771 /* Some machines might need RTAS info for debugging, grab it now. */ 772 of_scan_flat_dt(early_init_dt_scan_rtas, NULL); 773 #endif 774 775 #ifdef CONFIG_PPC_POWERNV 776 /* Some machines might need OPAL info for debugging, grab it now. */ 777 of_scan_flat_dt(early_init_dt_scan_opal, NULL); 778 779 /* Scan tree for ultravisor feature */ 780 of_scan_flat_dt(early_init_dt_scan_ultravisor, NULL); 781 #endif 782 783 #if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP) 784 /* scan tree to see if dump is active during last boot */ 785 of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL); 786 #endif 787 788 /* Retrieve various informations from the /chosen node of the 789 * device-tree, including the platform type, initrd location and 790 * size, TCE reserve, and more ... 791 */ 792 of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line); 793 794 /* Scan memory nodes and rebuild MEMBLOCKs */ 795 early_init_dt_scan_root(); 796 early_init_dt_scan_memory_ppc(); 797 798 /* 799 * As generic code authors expect to be able to use static keys 800 * in early_param() handlers, we initialize the static keys just 801 * before parsing early params (it's fine to call jump_label_init() 802 * more than once). 803 */ 804 jump_label_init(); 805 parse_early_param(); 806 807 /* make sure we've parsed cmdline for mem= before this */ 808 if (memory_limit) 809 first_memblock_size = min_t(u64, first_memblock_size, memory_limit); 810 setup_initial_memory_limit(memstart_addr, first_memblock_size); 811 /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */ 812 memblock_reserve(PHYSICAL_START, __pa(_end) - PHYSICAL_START); 813 /* If relocatable, reserve first 32k for interrupt vectors etc. */ 814 if (PHYSICAL_START > MEMORY_START) 815 memblock_reserve(MEMORY_START, 0x8000); 816 reserve_kdump_trampoline(); 817 #if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP) 818 /* 819 * If we fail to reserve memory for firmware-assisted dump then 820 * fallback to kexec based kdump. 821 */ 822 if (fadump_reserve_mem() == 0) 823 #endif 824 reserve_crashkernel(); 825 early_reserve_mem(); 826 827 /* Ensure that total memory size is page-aligned. */ 828 limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE); 829 memblock_enforce_memory_limit(limit); 830 831 #if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_4K_PAGES) 832 if (!early_radix_enabled()) 833 memblock_cap_memory_range(0, 1UL << (H_MAX_PHYSMEM_BITS)); 834 #endif 835 836 memblock_allow_resize(); 837 memblock_dump_all(); 838 839 DBG("Phys. mem: %llx\n", (unsigned long long)memblock_phys_mem_size()); 840 841 /* We may need to relocate the flat tree, do it now. 842 * FIXME .. and the initrd too? */ 843 move_device_tree(); 844 845 DBG("Scanning CPUs ...\n"); 846 847 dt_cpu_ftrs_scan(); 848 849 // We can now add the CPU name & PVR to the hardware description 850 seq_buf_printf(&ppc_hw_desc, "%s 0x%04lx ", cur_cpu_spec->cpu_name, mfspr(SPRN_PVR)); 851 852 /* Retrieve CPU related informations from the flat tree 853 * (altivec support, boot CPU ID, ...) 854 */ 855 of_scan_flat_dt(early_init_dt_scan_cpus, NULL); 856 if (boot_cpuid < 0) { 857 printk("Failed to identify boot CPU !\n"); 858 BUG(); 859 } 860 861 save_fscr_to_task(); 862 863 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64) 864 /* We'll later wait for secondaries to check in; there are 865 * NCPUS-1 non-boot CPUs :-) 866 */ 867 spinning_secondaries = boot_cpu_count - 1; 868 #endif 869 870 mmu_early_init_devtree(); 871 872 #ifdef CONFIG_PPC_POWERNV 873 /* Scan and build the list of machine check recoverable ranges */ 874 of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL); 875 #endif 876 epapr_paravirt_early_init(); 877 878 /* Now try to figure out if we are running on LPAR and so on */ 879 pseries_probe_fw_features(); 880 881 /* 882 * Initialize pkey features and default AMR/IAMR values 883 */ 884 pkey_early_init_devtree(); 885 886 #ifdef CONFIG_PPC_PS3 887 /* Identify PS3 firmware */ 888 if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3")) 889 powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE; 890 #endif 891 892 /* If kexec left a PLPKS password in the DT, get it and clear it */ 893 plpks_early_init_devtree(); 894 895 tm_init(); 896 897 DBG(" <- early_init_devtree()\n"); 898 } 899 900 #ifdef CONFIG_RELOCATABLE 901 /* 902 * This function run before early_init_devtree, so we have to init 903 * initial_boot_params. 904 */ 905 void __init early_get_first_memblock_info(void *params, phys_addr_t *size) 906 { 907 /* Setup flat device-tree pointer */ 908 initial_boot_params = params; 909 910 /* 911 * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid 912 * mess the memblock. 913 */ 914 add_mem_to_memblock = 0; 915 early_init_dt_scan_root(); 916 early_init_dt_scan_memory_ppc(); 917 add_mem_to_memblock = 1; 918 919 if (size) 920 *size = first_memblock_size; 921 } 922 #endif 923 924 /******* 925 * 926 * New implementation of the OF "find" APIs, return a refcounted 927 * object, call of_node_put() when done. The device tree and list 928 * are protected by a rw_lock. 929 * 930 * Note that property management will need some locking as well, 931 * this isn't dealt with yet. 932 * 933 *******/ 934 935 /** 936 * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device 937 * @np: device node of the device 938 * 939 * This looks for a property "ibm,chip-id" in the node or any 940 * of its parents and returns its content, or -1 if it cannot 941 * be found. 942 */ 943 int of_get_ibm_chip_id(struct device_node *np) 944 { 945 of_node_get(np); 946 while (np) { 947 u32 chip_id; 948 949 /* 950 * Skiboot may produce memory nodes that contain more than one 951 * cell in chip-id, we only read the first one here. 952 */ 953 if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) { 954 of_node_put(np); 955 return chip_id; 956 } 957 958 np = of_get_next_parent(np); 959 } 960 return -1; 961 } 962 EXPORT_SYMBOL(of_get_ibm_chip_id); 963 964 /** 965 * cpu_to_chip_id - Return the cpus chip-id 966 * @cpu: The logical cpu number. 967 * 968 * Return the value of the ibm,chip-id property corresponding to the given 969 * logical cpu number. If the chip-id can not be found, returns -1. 970 */ 971 int cpu_to_chip_id(int cpu) 972 { 973 struct device_node *np; 974 int ret = -1, idx; 975 976 idx = cpu / threads_per_core; 977 if (chip_id_lookup_table && chip_id_lookup_table[idx] != -1) 978 return chip_id_lookup_table[idx]; 979 980 np = of_get_cpu_node(cpu, NULL); 981 if (np) { 982 ret = of_get_ibm_chip_id(np); 983 of_node_put(np); 984 985 if (chip_id_lookup_table) 986 chip_id_lookup_table[idx] = ret; 987 } 988 989 return ret; 990 } 991 EXPORT_SYMBOL(cpu_to_chip_id); 992 993 bool arch_match_cpu_phys_id(int cpu, u64 phys_id) 994 { 995 #ifdef CONFIG_SMP 996 /* 997 * Early firmware scanning must use this rather than 998 * get_hard_smp_processor_id because we don't have pacas allocated 999 * until memory topology is discovered. 1000 */ 1001 if (cpu_to_phys_id != NULL) 1002 return (int)phys_id == cpu_to_phys_id[cpu]; 1003 #endif 1004 1005 return (int)phys_id == get_hard_smp_processor_id(cpu); 1006 } 1007