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 34 #include <asm/rtas.h> 35 #include <asm/page.h> 36 #include <asm/processor.h> 37 #include <asm/irq.h> 38 #include <asm/io.h> 39 #include <asm/kdump.h> 40 #include <asm/smp.h> 41 #include <asm/mmu.h> 42 #include <asm/paca.h> 43 #include <asm/powernv.h> 44 #include <asm/iommu.h> 45 #include <asm/btext.h> 46 #include <asm/sections.h> 47 #include <asm/machdep.h> 48 #include <asm/pci-bridge.h> 49 #include <asm/kexec.h> 50 #include <asm/opal.h> 51 #include <asm/fadump.h> 52 #include <asm/epapr_hcalls.h> 53 #include <asm/firmware.h> 54 #include <asm/dt_cpu_ftrs.h> 55 #include <asm/drmem.h> 56 #include <asm/ultravisor.h> 57 58 #include <mm/mmu_decl.h> 59 60 #ifdef DEBUG 61 #define DBG(fmt...) printk(KERN_ERR fmt) 62 #else 63 #define DBG(fmt...) 64 #endif 65 66 int *chip_id_lookup_table; 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 = 5, .pabit = 0, .cpu_features = CPU_FTR_REAL_LE, 169 .cpu_user_ftrs = PPC_FEATURE_TRUE_LE }, 170 /* 171 * If the kernel doesn't support TM (ie CONFIG_PPC_TRANSACTIONAL_MEM=n), 172 * we don't want to turn on TM here, so we use the *_COMP versions 173 * which are 0 if the kernel doesn't support TM. 174 */ 175 { .pabyte = 22, .pabit = 0, .cpu_features = CPU_FTR_TM_COMP, 176 .cpu_user_ftrs2 = PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_HTM_NOSC_COMP }, 177 178 { .pabyte = 64, .pabit = 0, .cpu_features = CPU_FTR_DAWR1 }, 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_64S_HASH_MMU 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 __init 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 int i; 295 struct feature_property *fp = feature_properties; 296 const __be32 *prop; 297 298 for (i = 0; i < (int)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 if (be32_to_cpu(intserv[i]) == 336 fdt_boot_cpuid_phys(initial_boot_params)) { 337 found = boot_cpu_count; 338 found_thread = i; 339 } 340 #ifdef CONFIG_SMP 341 /* logical cpu id is always 0 on UP kernels */ 342 boot_cpu_count++; 343 #endif 344 } 345 346 /* Not the boot CPU */ 347 if (found < 0) 348 return 0; 349 350 DBG("boot cpu: logical %d physical %d\n", found, 351 be32_to_cpu(intserv[found_thread])); 352 boot_cpuid = found; 353 354 // Pass the boot CPU's hard CPU id back to our caller 355 *((u32 *)data) = be32_to_cpu(intserv[found_thread]); 356 357 /* 358 * PAPR defines "logical" PVR values for cpus that 359 * meet various levels of the architecture: 360 * 0x0f000001 Architecture version 2.04 361 * 0x0f000002 Architecture version 2.05 362 * If the cpu-version property in the cpu node contains 363 * such a value, we call identify_cpu again with the 364 * logical PVR value in order to use the cpu feature 365 * bits appropriate for the architecture level. 366 * 367 * A POWER6 partition in "POWER6 architected" mode 368 * uses the 0x0f000002 PVR value; in POWER5+ mode 369 * it uses 0x0f000001. 370 * 371 * If we're using device tree CPU feature discovery then we don't 372 * support the cpu-version property, and it's the responsibility of the 373 * firmware/hypervisor to provide the correct feature set for the 374 * architecture level via the ibm,powerpc-cpu-features binding. 375 */ 376 if (!dt_cpu_ftrs_in_use()) { 377 prop = of_get_flat_dt_prop(node, "cpu-version", NULL); 378 if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000) 379 identify_cpu(0, be32_to_cpup(prop)); 380 381 check_cpu_feature_properties(node); 382 check_cpu_pa_features(node); 383 } 384 385 identical_pvr_fixup(node); 386 init_mmu_slb_size(node); 387 388 #ifdef CONFIG_PPC64 389 if (nthreads == 1) 390 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; 391 else if (!dt_cpu_ftrs_in_use()) 392 cur_cpu_spec->cpu_features |= CPU_FTR_SMT; 393 #endif 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(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 __init 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 __init 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(void) 536 { 537 #ifdef CONFIG_PPC_PSERIES 538 const void *fdt = initial_boot_params; 539 int node = fdt_path_offset(fdt, "/ibm,dynamic-reconfiguration-memory"); 540 541 if (node > 0) 542 walk_drmem_lmbs_early(node, NULL, early_init_drmem_lmb); 543 544 #endif 545 546 return early_init_dt_scan_memory(); 547 } 548 549 /* 550 * For a relocatable kernel, we need to get the memstart_addr first, 551 * then use it to calculate the virtual kernel start address. This has 552 * to happen at a very early stage (before machine_init). In this case, 553 * we just want to get the memstart_address and would not like to mess the 554 * memblock at this stage. So introduce a variable to skip the memblock_add() 555 * for this reason. 556 */ 557 #ifdef CONFIG_RELOCATABLE 558 static int add_mem_to_memblock = 1; 559 #else 560 #define add_mem_to_memblock 1 561 #endif 562 563 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 564 { 565 #ifdef CONFIG_PPC64 566 if (iommu_is_off) { 567 if (base >= 0x80000000ul) 568 return; 569 if ((base + size) > 0x80000000ul) 570 size = 0x80000000ul - base; 571 } 572 #endif 573 /* Keep track of the beginning of memory -and- the size of 574 * the very first block in the device-tree as it represents 575 * the RMA on ppc64 server 576 */ 577 if (base < memstart_addr) { 578 memstart_addr = base; 579 first_memblock_size = size; 580 } 581 582 /* Add the chunk to the MEMBLOCK list */ 583 if (add_mem_to_memblock) { 584 if (validate_mem_limit(base, &size)) 585 memblock_add(base, size); 586 } 587 } 588 589 static void __init early_reserve_mem_dt(void) 590 { 591 unsigned long i, dt_root; 592 int len; 593 const __be32 *prop; 594 595 early_init_fdt_reserve_self(); 596 early_init_fdt_scan_reserved_mem(); 597 598 dt_root = of_get_flat_dt_root(); 599 600 prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len); 601 602 if (!prop) 603 return; 604 605 DBG("Found new-style reserved-ranges\n"); 606 607 /* Each reserved range is an (address,size) pair, 2 cells each, 608 * totalling 4 cells per range. */ 609 for (i = 0; i < len / (sizeof(*prop) * 4); i++) { 610 u64 base, size; 611 612 base = of_read_number(prop + (i * 4) + 0, 2); 613 size = of_read_number(prop + (i * 4) + 2, 2); 614 615 if (size) { 616 DBG("reserving: %llx -> %llx\n", base, size); 617 memblock_reserve(base, size); 618 } 619 } 620 } 621 622 static void __init early_reserve_mem(void) 623 { 624 __be64 *reserve_map; 625 626 reserve_map = (__be64 *)(((unsigned long)initial_boot_params) + 627 fdt_off_mem_rsvmap(initial_boot_params)); 628 629 /* Look for the new "reserved-regions" property in the DT */ 630 early_reserve_mem_dt(); 631 632 #ifdef CONFIG_BLK_DEV_INITRD 633 /* Then reserve the initrd, if any */ 634 if (initrd_start && (initrd_end > initrd_start)) { 635 memblock_reserve(ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE), 636 ALIGN(initrd_end, PAGE_SIZE) - 637 ALIGN_DOWN(initrd_start, PAGE_SIZE)); 638 } 639 #endif /* CONFIG_BLK_DEV_INITRD */ 640 641 if (!IS_ENABLED(CONFIG_PPC32)) 642 return; 643 644 /* 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 } 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 u32 boot_cpu_hwid; 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 early_init_dt_scan_root(); 752 early_init_dt_scan_memory_ppc(); 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(_end) - 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 DBG("Scanning CPUs ...\n"); 795 796 dt_cpu_ftrs_scan(); 797 798 /* Retrieve CPU related informations from the flat tree 799 * (altivec support, boot CPU ID, ...) 800 */ 801 of_scan_flat_dt(early_init_dt_scan_cpus, &boot_cpu_hwid); 802 if (boot_cpuid < 0) { 803 printk("Failed to identify boot CPU !\n"); 804 BUG(); 805 } 806 807 save_fscr_to_task(); 808 809 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64) 810 /* We'll later wait for secondaries to check in; there are 811 * NCPUS-1 non-boot CPUs :-) 812 */ 813 spinning_secondaries = boot_cpu_count - 1; 814 #endif 815 816 mmu_early_init_devtree(); 817 818 // NB. paca is not installed until later in early_setup() 819 allocate_paca_ptrs(); 820 allocate_paca(boot_cpuid); 821 set_hard_smp_processor_id(boot_cpuid, boot_cpu_hwid); 822 823 #ifdef CONFIG_PPC_POWERNV 824 /* Scan and build the list of machine check recoverable ranges */ 825 of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL); 826 #endif 827 epapr_paravirt_early_init(); 828 829 /* Now try to figure out if we are running on LPAR and so on */ 830 pseries_probe_fw_features(); 831 832 /* 833 * Initialize pkey features and default AMR/IAMR values 834 */ 835 pkey_early_init_devtree(); 836 837 #ifdef CONFIG_PPC_PS3 838 /* Identify PS3 firmware */ 839 if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3")) 840 powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE; 841 #endif 842 843 tm_init(); 844 845 DBG(" <- early_init_devtree()\n"); 846 } 847 848 #ifdef CONFIG_RELOCATABLE 849 /* 850 * This function run before early_init_devtree, so we have to init 851 * initial_boot_params. 852 */ 853 void __init early_get_first_memblock_info(void *params, phys_addr_t *size) 854 { 855 /* Setup flat device-tree pointer */ 856 initial_boot_params = params; 857 858 /* 859 * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid 860 * mess the memblock. 861 */ 862 add_mem_to_memblock = 0; 863 early_init_dt_scan_root(); 864 early_init_dt_scan_memory_ppc(); 865 add_mem_to_memblock = 1; 866 867 if (size) 868 *size = first_memblock_size; 869 } 870 #endif 871 872 /******* 873 * 874 * New implementation of the OF "find" APIs, return a refcounted 875 * object, call of_node_put() when done. The device tree and list 876 * are protected by a rw_lock. 877 * 878 * Note that property management will need some locking as well, 879 * this isn't dealt with yet. 880 * 881 *******/ 882 883 /** 884 * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device 885 * @np: device node of the device 886 * 887 * This looks for a property "ibm,chip-id" in the node or any 888 * of its parents and returns its content, or -1 if it cannot 889 * be found. 890 */ 891 int of_get_ibm_chip_id(struct device_node *np) 892 { 893 of_node_get(np); 894 while (np) { 895 u32 chip_id; 896 897 /* 898 * Skiboot may produce memory nodes that contain more than one 899 * cell in chip-id, we only read the first one here. 900 */ 901 if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) { 902 of_node_put(np); 903 return chip_id; 904 } 905 906 np = of_get_next_parent(np); 907 } 908 return -1; 909 } 910 EXPORT_SYMBOL(of_get_ibm_chip_id); 911 912 /** 913 * cpu_to_chip_id - Return the cpus chip-id 914 * @cpu: The logical cpu number. 915 * 916 * Return the value of the ibm,chip-id property corresponding to the given 917 * logical cpu number. If the chip-id can not be found, returns -1. 918 */ 919 int cpu_to_chip_id(int cpu) 920 { 921 struct device_node *np; 922 int ret = -1, idx; 923 924 idx = cpu / threads_per_core; 925 if (chip_id_lookup_table && chip_id_lookup_table[idx] != -1) 926 return chip_id_lookup_table[idx]; 927 928 np = of_get_cpu_node(cpu, NULL); 929 if (np) { 930 ret = of_get_ibm_chip_id(np); 931 of_node_put(np); 932 933 if (chip_id_lookup_table) 934 chip_id_lookup_table[idx] = ret; 935 } 936 937 return ret; 938 } 939 EXPORT_SYMBOL(cpu_to_chip_id); 940 941 bool arch_match_cpu_phys_id(int cpu, u64 phys_id) 942 { 943 #ifdef CONFIG_SMP 944 /* 945 * Early firmware scanning must use this rather than 946 * get_hard_smp_processor_id because we don't have pacas allocated 947 * until memory topology is discovered. 948 */ 949 if (cpu_to_phys_id != NULL) 950 return (int)phys_id == cpu_to_phys_id[cpu]; 951 #endif 952 953 return (int)phys_id == get_hard_smp_processor_id(cpu); 954 } 955