| 1 | /* |
| 2 | * Procedures for creating, accessing and interpreting the device tree. |
| 3 | * |
| 4 | * Paul Mackerras August 1996. |
| 5 | * Copyright (C) 1996-2005 Paul Mackerras. |
| 6 | * |
| 7 | * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. |
| 8 | * {engebret|bergner}@us.ibm.com |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | */ |
| 15 | |
| 16 | #undef DEBUG |
| 17 | |
| 18 | #include <stdarg.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/string.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/threads.h> |
| 23 | #include <linux/spinlock.h> |
| 24 | #include <linux/types.h> |
| 25 | #include <linux/pci.h> |
| 26 | #include <linux/stringify.h> |
| 27 | #include <linux/delay.h> |
| 28 | #include <linux/initrd.h> |
| 29 | #include <linux/bitops.h> |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/kexec.h> |
| 32 | #include <linux/debugfs.h> |
| 33 | #include <linux/irq.h> |
| 34 | #include <linux/lmb.h> |
| 35 | |
| 36 | #include <asm/prom.h> |
| 37 | #include <asm/rtas.h> |
| 38 | #include <asm/page.h> |
| 39 | #include <asm/processor.h> |
| 40 | #include <asm/irq.h> |
| 41 | #include <asm/io.h> |
| 42 | #include <asm/kdump.h> |
| 43 | #include <asm/smp.h> |
| 44 | #include <asm/system.h> |
| 45 | #include <asm/mmu.h> |
| 46 | #include <asm/pgtable.h> |
| 47 | #include <asm/pci.h> |
| 48 | #include <asm/iommu.h> |
| 49 | #include <asm/btext.h> |
| 50 | #include <asm/sections.h> |
| 51 | #include <asm/machdep.h> |
| 52 | #include <asm/pSeries_reconfig.h> |
| 53 | #include <asm/pci-bridge.h> |
| 54 | #include <asm/phyp_dump.h> |
| 55 | #include <asm/kexec.h> |
| 56 | #include <mm/mmu_decl.h> |
| 57 | |
| 58 | #ifdef DEBUG |
| 59 | #define DBG(fmt...) printk(KERN_ERR fmt) |
| 60 | #else |
| 61 | #define DBG(fmt...) |
| 62 | #endif |
| 63 | |
| 64 | #ifdef CONFIG_PPC64 |
| 65 | int __initdata iommu_is_off; |
| 66 | int __initdata iommu_force_on; |
| 67 | unsigned long tce_alloc_start, tce_alloc_end; |
| 68 | #endif |
| 69 | |
| 70 | extern rwlock_t devtree_lock; /* temporary while merging */ |
| 71 | |
| 72 | /* export that to outside world */ |
| 73 | struct device_node *of_chosen; |
| 74 | |
| 75 | static int __init early_parse_mem(char *p) |
| 76 | { |
| 77 | if (!p) |
| 78 | return 1; |
| 79 | |
| 80 | memory_limit = PAGE_ALIGN(memparse(p, &p)); |
| 81 | DBG("memory limit = 0x%llx\n", (unsigned long long)memory_limit); |
| 82 | |
| 83 | return 0; |
| 84 | } |
| 85 | early_param("mem", early_parse_mem); |
| 86 | |
| 87 | /** |
| 88 | * move_device_tree - move tree to an unused area, if needed. |
| 89 | * |
| 90 | * The device tree may be allocated beyond our memory limit, or inside the |
| 91 | * crash kernel region for kdump. If so, move it out of the way. |
| 92 | */ |
| 93 | static void __init move_device_tree(void) |
| 94 | { |
| 95 | unsigned long start, size; |
| 96 | void *p; |
| 97 | |
| 98 | DBG("-> move_device_tree\n"); |
| 99 | |
| 100 | start = __pa(initial_boot_params); |
| 101 | size = initial_boot_params->totalsize; |
| 102 | |
| 103 | if ((memory_limit && (start + size) > memory_limit) || |
| 104 | overlaps_crashkernel(start, size)) { |
| 105 | p = __va(lmb_alloc_base(size, PAGE_SIZE, lmb.rmo_size)); |
| 106 | memcpy(p, initial_boot_params, size); |
| 107 | initial_boot_params = (struct boot_param_header *)p; |
| 108 | DBG("Moved device tree to 0x%p\n", p); |
| 109 | } |
| 110 | |
| 111 | DBG("<- move_device_tree\n"); |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * ibm,pa-features is a per-cpu property that contains a string of |
| 116 | * attribute descriptors, each of which has a 2 byte header plus up |
| 117 | * to 254 bytes worth of processor attribute bits. First header |
| 118 | * byte specifies the number of bytes following the header. |
| 119 | * Second header byte is an "attribute-specifier" type, of which |
| 120 | * zero is the only currently-defined value. |
| 121 | * Implementation: Pass in the byte and bit offset for the feature |
| 122 | * that we are interested in. The function will return -1 if the |
| 123 | * pa-features property is missing, or a 1/0 to indicate if the feature |
| 124 | * is supported/not supported. Note that the bit numbers are |
| 125 | * big-endian to match the definition in PAPR. |
| 126 | */ |
| 127 | static struct ibm_pa_feature { |
| 128 | unsigned long cpu_features; /* CPU_FTR_xxx bit */ |
| 129 | unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */ |
| 130 | unsigned char pabyte; /* byte number in ibm,pa-features */ |
| 131 | unsigned char pabit; /* bit number (big-endian) */ |
| 132 | unsigned char invert; /* if 1, pa bit set => clear feature */ |
| 133 | } ibm_pa_features[] __initdata = { |
| 134 | {0, PPC_FEATURE_HAS_MMU, 0, 0, 0}, |
| 135 | {0, PPC_FEATURE_HAS_FPU, 0, 1, 0}, |
| 136 | {CPU_FTR_SLB, 0, 0, 2, 0}, |
| 137 | {CPU_FTR_CTRL, 0, 0, 3, 0}, |
| 138 | {CPU_FTR_NOEXECUTE, 0, 0, 6, 0}, |
| 139 | {CPU_FTR_NODSISRALIGN, 0, 1, 1, 1}, |
| 140 | {CPU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0}, |
| 141 | {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0}, |
| 142 | }; |
| 143 | |
| 144 | static void __init scan_features(unsigned long node, unsigned char *ftrs, |
| 145 | unsigned long tablelen, |
| 146 | struct ibm_pa_feature *fp, |
| 147 | unsigned long ft_size) |
| 148 | { |
| 149 | unsigned long i, len, bit; |
| 150 | |
| 151 | /* find descriptor with type == 0 */ |
| 152 | for (;;) { |
| 153 | if (tablelen < 3) |
| 154 | return; |
| 155 | len = 2 + ftrs[0]; |
| 156 | if (tablelen < len) |
| 157 | return; /* descriptor 0 not found */ |
| 158 | if (ftrs[1] == 0) |
| 159 | break; |
| 160 | tablelen -= len; |
| 161 | ftrs += len; |
| 162 | } |
| 163 | |
| 164 | /* loop over bits we know about */ |
| 165 | for (i = 0; i < ft_size; ++i, ++fp) { |
| 166 | if (fp->pabyte >= ftrs[0]) |
| 167 | continue; |
| 168 | bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; |
| 169 | if (bit ^ fp->invert) { |
| 170 | cur_cpu_spec->cpu_features |= fp->cpu_features; |
| 171 | cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; |
| 172 | } else { |
| 173 | cur_cpu_spec->cpu_features &= ~fp->cpu_features; |
| 174 | cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs; |
| 175 | } |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | static void __init check_cpu_pa_features(unsigned long node) |
| 180 | { |
| 181 | unsigned char *pa_ftrs; |
| 182 | unsigned long tablelen; |
| 183 | |
| 184 | pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); |
| 185 | if (pa_ftrs == NULL) |
| 186 | return; |
| 187 | |
| 188 | scan_features(node, pa_ftrs, tablelen, |
| 189 | ibm_pa_features, ARRAY_SIZE(ibm_pa_features)); |
| 190 | } |
| 191 | |
| 192 | #ifdef CONFIG_PPC_STD_MMU_64 |
| 193 | static void __init check_cpu_slb_size(unsigned long node) |
| 194 | { |
| 195 | u32 *slb_size_ptr; |
| 196 | |
| 197 | slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL); |
| 198 | if (slb_size_ptr != NULL) { |
| 199 | mmu_slb_size = *slb_size_ptr; |
| 200 | return; |
| 201 | } |
| 202 | slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL); |
| 203 | if (slb_size_ptr != NULL) { |
| 204 | mmu_slb_size = *slb_size_ptr; |
| 205 | } |
| 206 | } |
| 207 | #else |
| 208 | #define check_cpu_slb_size(node) do { } while(0) |
| 209 | #endif |
| 210 | |
| 211 | static struct feature_property { |
| 212 | const char *name; |
| 213 | u32 min_value; |
| 214 | unsigned long cpu_feature; |
| 215 | unsigned long cpu_user_ftr; |
| 216 | } feature_properties[] __initdata = { |
| 217 | #ifdef CONFIG_ALTIVEC |
| 218 | {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, |
| 219 | {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, |
| 220 | #endif /* CONFIG_ALTIVEC */ |
| 221 | #ifdef CONFIG_VSX |
| 222 | /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */ |
| 223 | {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX}, |
| 224 | #endif /* CONFIG_VSX */ |
| 225 | #ifdef CONFIG_PPC64 |
| 226 | {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP}, |
| 227 | {"ibm,purr", 1, CPU_FTR_PURR, 0}, |
| 228 | {"ibm,spurr", 1, CPU_FTR_SPURR, 0}, |
| 229 | #endif /* CONFIG_PPC64 */ |
| 230 | }; |
| 231 | |
| 232 | #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU) |
| 233 | static inline void identical_pvr_fixup(unsigned long node) |
| 234 | { |
| 235 | unsigned int pvr; |
| 236 | char *model = of_get_flat_dt_prop(node, "model", NULL); |
| 237 | |
| 238 | /* |
| 239 | * Since 440GR(x)/440EP(x) processors have the same pvr, |
| 240 | * we check the node path and set bit 28 in the cur_cpu_spec |
| 241 | * pvr for EP(x) processor version. This bit is always 0 in |
| 242 | * the "real" pvr. Then we call identify_cpu again with |
| 243 | * the new logical pvr to enable FPU support. |
| 244 | */ |
| 245 | if (model && strstr(model, "440EP")) { |
| 246 | pvr = cur_cpu_spec->pvr_value | 0x8; |
| 247 | identify_cpu(0, pvr); |
| 248 | DBG("Using logical pvr %x for %s\n", pvr, model); |
| 249 | } |
| 250 | } |
| 251 | #else |
| 252 | #define identical_pvr_fixup(node) do { } while(0) |
| 253 | #endif |
| 254 | |
| 255 | static void __init check_cpu_feature_properties(unsigned long node) |
| 256 | { |
| 257 | unsigned long i; |
| 258 | struct feature_property *fp = feature_properties; |
| 259 | const u32 *prop; |
| 260 | |
| 261 | for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) { |
| 262 | prop = of_get_flat_dt_prop(node, fp->name, NULL); |
| 263 | if (prop && *prop >= fp->min_value) { |
| 264 | cur_cpu_spec->cpu_features |= fp->cpu_feature; |
| 265 | cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr; |
| 266 | } |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | static int __init early_init_dt_scan_cpus(unsigned long node, |
| 271 | const char *uname, int depth, |
| 272 | void *data) |
| 273 | { |
| 274 | static int logical_cpuid = 0; |
| 275 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
| 276 | const u32 *prop; |
| 277 | const u32 *intserv; |
| 278 | int i, nthreads; |
| 279 | unsigned long len; |
| 280 | int found = 0; |
| 281 | |
| 282 | /* We are scanning "cpu" nodes only */ |
| 283 | if (type == NULL || strcmp(type, "cpu") != 0) |
| 284 | return 0; |
| 285 | |
| 286 | /* Get physical cpuid */ |
| 287 | intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len); |
| 288 | if (intserv) { |
| 289 | nthreads = len / sizeof(int); |
| 290 | } else { |
| 291 | intserv = of_get_flat_dt_prop(node, "reg", NULL); |
| 292 | nthreads = 1; |
| 293 | } |
| 294 | |
| 295 | /* |
| 296 | * Now see if any of these threads match our boot cpu. |
| 297 | * NOTE: This must match the parsing done in smp_setup_cpu_maps. |
| 298 | */ |
| 299 | for (i = 0; i < nthreads; i++) { |
| 300 | /* |
| 301 | * version 2 of the kexec param format adds the phys cpuid of |
| 302 | * booted proc. |
| 303 | */ |
| 304 | if (initial_boot_params && initial_boot_params->version >= 2) { |
| 305 | if (intserv[i] == |
| 306 | initial_boot_params->boot_cpuid_phys) { |
| 307 | found = 1; |
| 308 | break; |
| 309 | } |
| 310 | } else { |
| 311 | /* |
| 312 | * Check if it's the boot-cpu, set it's hw index now, |
| 313 | * unfortunately this format did not support booting |
| 314 | * off secondary threads. |
| 315 | */ |
| 316 | if (of_get_flat_dt_prop(node, |
| 317 | "linux,boot-cpu", NULL) != NULL) { |
| 318 | found = 1; |
| 319 | break; |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | #ifdef CONFIG_SMP |
| 324 | /* logical cpu id is always 0 on UP kernels */ |
| 325 | logical_cpuid++; |
| 326 | #endif |
| 327 | } |
| 328 | |
| 329 | if (found) { |
| 330 | DBG("boot cpu: logical %d physical %d\n", logical_cpuid, |
| 331 | intserv[i]); |
| 332 | boot_cpuid = logical_cpuid; |
| 333 | set_hard_smp_processor_id(boot_cpuid, intserv[i]); |
| 334 | |
| 335 | /* |
| 336 | * PAPR defines "logical" PVR values for cpus that |
| 337 | * meet various levels of the architecture: |
| 338 | * 0x0f000001 Architecture version 2.04 |
| 339 | * 0x0f000002 Architecture version 2.05 |
| 340 | * If the cpu-version property in the cpu node contains |
| 341 | * such a value, we call identify_cpu again with the |
| 342 | * logical PVR value in order to use the cpu feature |
| 343 | * bits appropriate for the architecture level. |
| 344 | * |
| 345 | * A POWER6 partition in "POWER6 architected" mode |
| 346 | * uses the 0x0f000002 PVR value; in POWER5+ mode |
| 347 | * it uses 0x0f000001. |
| 348 | */ |
| 349 | prop = of_get_flat_dt_prop(node, "cpu-version", NULL); |
| 350 | if (prop && (*prop & 0xff000000) == 0x0f000000) |
| 351 | identify_cpu(0, *prop); |
| 352 | |
| 353 | identical_pvr_fixup(node); |
| 354 | } |
| 355 | |
| 356 | check_cpu_feature_properties(node); |
| 357 | check_cpu_pa_features(node); |
| 358 | check_cpu_slb_size(node); |
| 359 | |
| 360 | #ifdef CONFIG_PPC_PSERIES |
| 361 | if (nthreads > 1) |
| 362 | cur_cpu_spec->cpu_features |= CPU_FTR_SMT; |
| 363 | else |
| 364 | cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; |
| 365 | #endif |
| 366 | |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | void __init early_init_dt_scan_chosen_arch(unsigned long node) |
| 371 | { |
| 372 | unsigned long *lprop; |
| 373 | |
| 374 | #ifdef CONFIG_PPC64 |
| 375 | /* check if iommu is forced on or off */ |
| 376 | if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) |
| 377 | iommu_is_off = 1; |
| 378 | if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) |
| 379 | iommu_force_on = 1; |
| 380 | #endif |
| 381 | |
| 382 | /* mem=x on the command line is the preferred mechanism */ |
| 383 | lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); |
| 384 | if (lprop) |
| 385 | memory_limit = *lprop; |
| 386 | |
| 387 | #ifdef CONFIG_PPC64 |
| 388 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); |
| 389 | if (lprop) |
| 390 | tce_alloc_start = *lprop; |
| 391 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); |
| 392 | if (lprop) |
| 393 | tce_alloc_end = *lprop; |
| 394 | #endif |
| 395 | |
| 396 | #ifdef CONFIG_KEXEC |
| 397 | lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); |
| 398 | if (lprop) |
| 399 | crashk_res.start = *lprop; |
| 400 | |
| 401 | lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); |
| 402 | if (lprop) |
| 403 | crashk_res.end = crashk_res.start + *lprop - 1; |
| 404 | #endif |
| 405 | } |
| 406 | |
| 407 | #ifdef CONFIG_PPC_PSERIES |
| 408 | /* |
| 409 | * Interpret the ibm,dynamic-memory property in the |
| 410 | * /ibm,dynamic-reconfiguration-memory node. |
| 411 | * This contains a list of memory blocks along with NUMA affinity |
| 412 | * information. |
| 413 | */ |
| 414 | static int __init early_init_dt_scan_drconf_memory(unsigned long node) |
| 415 | { |
| 416 | __be32 *dm, *ls, *usm; |
| 417 | unsigned long l, n, flags; |
| 418 | u64 base, size, lmb_size; |
| 419 | unsigned int is_kexec_kdump = 0, rngs; |
| 420 | |
| 421 | ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l); |
| 422 | if (ls == NULL || l < dt_root_size_cells * sizeof(__be32)) |
| 423 | return 0; |
| 424 | lmb_size = dt_mem_next_cell(dt_root_size_cells, &ls); |
| 425 | |
| 426 | dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l); |
| 427 | if (dm == NULL || l < sizeof(__be32)) |
| 428 | return 0; |
| 429 | |
| 430 | n = *dm++; /* number of entries */ |
| 431 | if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32)) |
| 432 | return 0; |
| 433 | |
| 434 | /* check if this is a kexec/kdump kernel. */ |
| 435 | usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory", |
| 436 | &l); |
| 437 | if (usm != NULL) |
| 438 | is_kexec_kdump = 1; |
| 439 | |
| 440 | for (; n != 0; --n) { |
| 441 | base = dt_mem_next_cell(dt_root_addr_cells, &dm); |
| 442 | flags = dm[3]; |
| 443 | /* skip DRC index, pad, assoc. list index, flags */ |
| 444 | dm += 4; |
| 445 | /* skip this block if the reserved bit is set in flags (0x80) |
| 446 | or if the block is not assigned to this partition (0x8) */ |
| 447 | if ((flags & 0x80) || !(flags & 0x8)) |
| 448 | continue; |
| 449 | size = lmb_size; |
| 450 | rngs = 1; |
| 451 | if (is_kexec_kdump) { |
| 452 | /* |
| 453 | * For each lmb in ibm,dynamic-memory, a corresponding |
| 454 | * entry in linux,drconf-usable-memory property contains |
| 455 | * a counter 'p' followed by 'p' (base, size) duple. |
| 456 | * Now read the counter from |
| 457 | * linux,drconf-usable-memory property |
| 458 | */ |
| 459 | rngs = dt_mem_next_cell(dt_root_size_cells, &usm); |
| 460 | if (!rngs) /* there are no (base, size) duple */ |
| 461 | continue; |
| 462 | } |
| 463 | do { |
| 464 | if (is_kexec_kdump) { |
| 465 | base = dt_mem_next_cell(dt_root_addr_cells, |
| 466 | &usm); |
| 467 | size = dt_mem_next_cell(dt_root_size_cells, |
| 468 | &usm); |
| 469 | } |
| 470 | if (iommu_is_off) { |
| 471 | if (base >= 0x80000000ul) |
| 472 | continue; |
| 473 | if ((base + size) > 0x80000000ul) |
| 474 | size = 0x80000000ul - base; |
| 475 | } |
| 476 | lmb_add(base, size); |
| 477 | } while (--rngs); |
| 478 | } |
| 479 | lmb_dump_all(); |
| 480 | return 0; |
| 481 | } |
| 482 | #else |
| 483 | #define early_init_dt_scan_drconf_memory(node) 0 |
| 484 | #endif /* CONFIG_PPC_PSERIES */ |
| 485 | |
| 486 | static int __init early_init_dt_scan_memory_ppc(unsigned long node, |
| 487 | const char *uname, |
| 488 | int depth, void *data) |
| 489 | { |
| 490 | if (depth == 1 && |
| 491 | strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) |
| 492 | return early_init_dt_scan_drconf_memory(node); |
| 493 | |
| 494 | return early_init_dt_scan_memory(node, uname, depth, data); |
| 495 | } |
| 496 | |
| 497 | void __init early_init_dt_add_memory_arch(u64 base, u64 size) |
| 498 | { |
| 499 | #if defined(CONFIG_PPC64) |
| 500 | if (iommu_is_off) { |
| 501 | if (base >= 0x80000000ul) |
| 502 | return; |
| 503 | if ((base + size) > 0x80000000ul) |
| 504 | size = 0x80000000ul - base; |
| 505 | } |
| 506 | #endif |
| 507 | |
| 508 | lmb_add(base, size); |
| 509 | |
| 510 | memstart_addr = min((u64)memstart_addr, base); |
| 511 | } |
| 512 | |
| 513 | static void __init early_reserve_mem(void) |
| 514 | { |
| 515 | u64 base, size; |
| 516 | u64 *reserve_map; |
| 517 | unsigned long self_base; |
| 518 | unsigned long self_size; |
| 519 | |
| 520 | reserve_map = (u64 *)(((unsigned long)initial_boot_params) + |
| 521 | initial_boot_params->off_mem_rsvmap); |
| 522 | |
| 523 | /* before we do anything, lets reserve the dt blob */ |
| 524 | self_base = __pa((unsigned long)initial_boot_params); |
| 525 | self_size = initial_boot_params->totalsize; |
| 526 | lmb_reserve(self_base, self_size); |
| 527 | |
| 528 | #ifdef CONFIG_BLK_DEV_INITRD |
| 529 | /* then reserve the initrd, if any */ |
| 530 | if (initrd_start && (initrd_end > initrd_start)) |
| 531 | lmb_reserve(__pa(initrd_start), initrd_end - initrd_start); |
| 532 | #endif /* CONFIG_BLK_DEV_INITRD */ |
| 533 | |
| 534 | #ifdef CONFIG_PPC32 |
| 535 | /* |
| 536 | * Handle the case where we might be booting from an old kexec |
| 537 | * image that setup the mem_rsvmap as pairs of 32-bit values |
| 538 | */ |
| 539 | if (*reserve_map > 0xffffffffull) { |
| 540 | u32 base_32, size_32; |
| 541 | u32 *reserve_map_32 = (u32 *)reserve_map; |
| 542 | |
| 543 | while (1) { |
| 544 | base_32 = *(reserve_map_32++); |
| 545 | size_32 = *(reserve_map_32++); |
| 546 | if (size_32 == 0) |
| 547 | break; |
| 548 | /* skip if the reservation is for the blob */ |
| 549 | if (base_32 == self_base && size_32 == self_size) |
| 550 | continue; |
| 551 | DBG("reserving: %x -> %x\n", base_32, size_32); |
| 552 | lmb_reserve(base_32, size_32); |
| 553 | } |
| 554 | return; |
| 555 | } |
| 556 | #endif |
| 557 | while (1) { |
| 558 | base = *(reserve_map++); |
| 559 | size = *(reserve_map++); |
| 560 | if (size == 0) |
| 561 | break; |
| 562 | DBG("reserving: %llx -> %llx\n", base, size); |
| 563 | lmb_reserve(base, size); |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | #ifdef CONFIG_PHYP_DUMP |
| 568 | /** |
| 569 | * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg |
| 570 | * |
| 571 | * Function to find the largest size we need to reserve |
| 572 | * during early boot process. |
| 573 | * |
| 574 | * It either looks for boot param and returns that OR |
| 575 | * returns larger of 256 or 5% rounded down to multiples of 256MB. |
| 576 | * |
| 577 | */ |
| 578 | static inline unsigned long phyp_dump_calculate_reserve_size(void) |
| 579 | { |
| 580 | unsigned long tmp; |
| 581 | |
| 582 | if (phyp_dump_info->reserve_bootvar) |
| 583 | return phyp_dump_info->reserve_bootvar; |
| 584 | |
| 585 | /* divide by 20 to get 5% of value */ |
| 586 | tmp = lmb_end_of_DRAM(); |
| 587 | do_div(tmp, 20); |
| 588 | |
| 589 | /* round it down in multiples of 256 */ |
| 590 | tmp = tmp & ~0x0FFFFFFFUL; |
| 591 | |
| 592 | return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END); |
| 593 | } |
| 594 | |
| 595 | /** |
| 596 | * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory |
| 597 | * |
| 598 | * This routine may reserve memory regions in the kernel only |
| 599 | * if the system is supported and a dump was taken in last |
| 600 | * boot instance or if the hardware is supported and the |
| 601 | * scratch area needs to be setup. In other instances it returns |
| 602 | * without reserving anything. The memory in case of dump being |
| 603 | * active is freed when the dump is collected (by userland tools). |
| 604 | */ |
| 605 | static void __init phyp_dump_reserve_mem(void) |
| 606 | { |
| 607 | unsigned long base, size; |
| 608 | unsigned long variable_reserve_size; |
| 609 | |
| 610 | if (!phyp_dump_info->phyp_dump_configured) { |
| 611 | printk(KERN_ERR "Phyp-dump not supported on this hardware\n"); |
| 612 | return; |
| 613 | } |
| 614 | |
| 615 | if (!phyp_dump_info->phyp_dump_at_boot) { |
| 616 | printk(KERN_INFO "Phyp-dump disabled at boot time\n"); |
| 617 | return; |
| 618 | } |
| 619 | |
| 620 | variable_reserve_size = phyp_dump_calculate_reserve_size(); |
| 621 | |
| 622 | if (phyp_dump_info->phyp_dump_is_active) { |
| 623 | /* Reserve *everything* above RMR.Area freed by userland tools*/ |
| 624 | base = variable_reserve_size; |
| 625 | size = lmb_end_of_DRAM() - base; |
| 626 | |
| 627 | /* XXX crashed_ram_end is wrong, since it may be beyond |
| 628 | * the memory_limit, it will need to be adjusted. */ |
| 629 | lmb_reserve(base, size); |
| 630 | |
| 631 | phyp_dump_info->init_reserve_start = base; |
| 632 | phyp_dump_info->init_reserve_size = size; |
| 633 | } else { |
| 634 | size = phyp_dump_info->cpu_state_size + |
| 635 | phyp_dump_info->hpte_region_size + |
| 636 | variable_reserve_size; |
| 637 | base = lmb_end_of_DRAM() - size; |
| 638 | lmb_reserve(base, size); |
| 639 | phyp_dump_info->init_reserve_start = base; |
| 640 | phyp_dump_info->init_reserve_size = size; |
| 641 | } |
| 642 | } |
| 643 | #else |
| 644 | static inline void __init phyp_dump_reserve_mem(void) {} |
| 645 | #endif /* CONFIG_PHYP_DUMP && CONFIG_PPC_RTAS */ |
| 646 | |
| 647 | |
| 648 | void __init early_init_devtree(void *params) |
| 649 | { |
| 650 | phys_addr_t limit; |
| 651 | |
| 652 | DBG(" -> early_init_devtree(%p)\n", params); |
| 653 | |
| 654 | /* Setup flat device-tree pointer */ |
| 655 | initial_boot_params = params; |
| 656 | |
| 657 | #ifdef CONFIG_PPC_RTAS |
| 658 | /* Some machines might need RTAS info for debugging, grab it now. */ |
| 659 | of_scan_flat_dt(early_init_dt_scan_rtas, NULL); |
| 660 | #endif |
| 661 | |
| 662 | #ifdef CONFIG_PHYP_DUMP |
| 663 | /* scan tree to see if dump occured during last boot */ |
| 664 | of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL); |
| 665 | #endif |
| 666 | |
| 667 | /* Retrieve various informations from the /chosen node of the |
| 668 | * device-tree, including the platform type, initrd location and |
| 669 | * size, TCE reserve, and more ... |
| 670 | */ |
| 671 | of_scan_flat_dt(early_init_dt_scan_chosen, NULL); |
| 672 | |
| 673 | /* Scan memory nodes and rebuild LMBs */ |
| 674 | lmb_init(); |
| 675 | of_scan_flat_dt(early_init_dt_scan_root, NULL); |
| 676 | of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); |
| 677 | |
| 678 | /* Save command line for /proc/cmdline and then parse parameters */ |
| 679 | strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); |
| 680 | parse_early_param(); |
| 681 | |
| 682 | /* Reserve LMB regions used by kernel, initrd, dt, etc... */ |
| 683 | lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); |
| 684 | /* If relocatable, reserve first 32k for interrupt vectors etc. */ |
| 685 | if (PHYSICAL_START > MEMORY_START) |
| 686 | lmb_reserve(MEMORY_START, 0x8000); |
| 687 | reserve_kdump_trampoline(); |
| 688 | reserve_crashkernel(); |
| 689 | early_reserve_mem(); |
| 690 | phyp_dump_reserve_mem(); |
| 691 | |
| 692 | limit = memory_limit; |
| 693 | if (! limit) { |
| 694 | phys_addr_t memsize; |
| 695 | |
| 696 | /* Ensure that total memory size is page-aligned, because |
| 697 | * otherwise mark_bootmem() gets upset. */ |
| 698 | lmb_analyze(); |
| 699 | memsize = lmb_phys_mem_size(); |
| 700 | if ((memsize & PAGE_MASK) != memsize) |
| 701 | limit = memsize & PAGE_MASK; |
| 702 | } |
| 703 | lmb_enforce_memory_limit(limit); |
| 704 | |
| 705 | lmb_analyze(); |
| 706 | lmb_dump_all(); |
| 707 | |
| 708 | DBG("Phys. mem: %llx\n", lmb_phys_mem_size()); |
| 709 | |
| 710 | /* We may need to relocate the flat tree, do it now. |
| 711 | * FIXME .. and the initrd too? */ |
| 712 | move_device_tree(); |
| 713 | |
| 714 | DBG("Scanning CPUs ...\n"); |
| 715 | |
| 716 | /* Retreive CPU related informations from the flat tree |
| 717 | * (altivec support, boot CPU ID, ...) |
| 718 | */ |
| 719 | of_scan_flat_dt(early_init_dt_scan_cpus, NULL); |
| 720 | |
| 721 | DBG(" <- early_init_devtree()\n"); |
| 722 | } |
| 723 | |
| 724 | /******* |
| 725 | * |
| 726 | * New implementation of the OF "find" APIs, return a refcounted |
| 727 | * object, call of_node_put() when done. The device tree and list |
| 728 | * are protected by a rw_lock. |
| 729 | * |
| 730 | * Note that property management will need some locking as well, |
| 731 | * this isn't dealt with yet. |
| 732 | * |
| 733 | *******/ |
| 734 | |
| 735 | /** |
| 736 | * of_find_next_cache_node - Find a node's subsidiary cache |
| 737 | * @np: node of type "cpu" or "cache" |
| 738 | * |
| 739 | * Returns a node pointer with refcount incremented, use |
| 740 | * of_node_put() on it when done. Caller should hold a reference |
| 741 | * to np. |
| 742 | */ |
| 743 | struct device_node *of_find_next_cache_node(struct device_node *np) |
| 744 | { |
| 745 | struct device_node *child; |
| 746 | const phandle *handle; |
| 747 | |
| 748 | handle = of_get_property(np, "l2-cache", NULL); |
| 749 | if (!handle) |
| 750 | handle = of_get_property(np, "next-level-cache", NULL); |
| 751 | |
| 752 | if (handle) |
| 753 | return of_find_node_by_phandle(*handle); |
| 754 | |
| 755 | /* OF on pmac has nodes instead of properties named "l2-cache" |
| 756 | * beneath CPU nodes. |
| 757 | */ |
| 758 | if (!strcmp(np->type, "cpu")) |
| 759 | for_each_child_of_node(np, child) |
| 760 | if (!strcmp(child->type, "cache")) |
| 761 | return child; |
| 762 | |
| 763 | return NULL; |
| 764 | } |
| 765 | |
| 766 | #ifdef CONFIG_PPC_PSERIES |
| 767 | /* |
| 768 | * Fix up the uninitialized fields in a new device node: |
| 769 | * name, type and pci-specific fields |
| 770 | */ |
| 771 | |
| 772 | static int of_finish_dynamic_node(struct device_node *node) |
| 773 | { |
| 774 | struct device_node *parent = of_get_parent(node); |
| 775 | int err = 0; |
| 776 | const phandle *ibm_phandle; |
| 777 | |
| 778 | node->name = of_get_property(node, "name", NULL); |
| 779 | node->type = of_get_property(node, "device_type", NULL); |
| 780 | |
| 781 | if (!node->name) |
| 782 | node->name = "<NULL>"; |
| 783 | if (!node->type) |
| 784 | node->type = "<NULL>"; |
| 785 | |
| 786 | if (!parent) { |
| 787 | err = -ENODEV; |
| 788 | goto out; |
| 789 | } |
| 790 | |
| 791 | /* We don't support that function on PowerMac, at least |
| 792 | * not yet |
| 793 | */ |
| 794 | if (machine_is(powermac)) |
| 795 | return -ENODEV; |
| 796 | |
| 797 | /* fix up new node's phandle field */ |
| 798 | if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL))) |
| 799 | node->phandle = *ibm_phandle; |
| 800 | |
| 801 | out: |
| 802 | of_node_put(parent); |
| 803 | return err; |
| 804 | } |
| 805 | |
| 806 | static int prom_reconfig_notifier(struct notifier_block *nb, |
| 807 | unsigned long action, void *node) |
| 808 | { |
| 809 | int err; |
| 810 | |
| 811 | switch (action) { |
| 812 | case PSERIES_RECONFIG_ADD: |
| 813 | err = of_finish_dynamic_node(node); |
| 814 | if (err < 0) { |
| 815 | printk(KERN_ERR "finish_node returned %d\n", err); |
| 816 | err = NOTIFY_BAD; |
| 817 | } |
| 818 | break; |
| 819 | default: |
| 820 | err = NOTIFY_DONE; |
| 821 | break; |
| 822 | } |
| 823 | return err; |
| 824 | } |
| 825 | |
| 826 | static struct notifier_block prom_reconfig_nb = { |
| 827 | .notifier_call = prom_reconfig_notifier, |
| 828 | .priority = 10, /* This one needs to run first */ |
| 829 | }; |
| 830 | |
| 831 | static int __init prom_reconfig_setup(void) |
| 832 | { |
| 833 | return pSeries_reconfig_notifier_register(&prom_reconfig_nb); |
| 834 | } |
| 835 | __initcall(prom_reconfig_setup); |
| 836 | #endif |
| 837 | |
| 838 | /* Find the device node for a given logical cpu number, also returns the cpu |
| 839 | * local thread number (index in ibm,interrupt-server#s) if relevant and |
| 840 | * asked for (non NULL) |
| 841 | */ |
| 842 | struct device_node *of_get_cpu_node(int cpu, unsigned int *thread) |
| 843 | { |
| 844 | int hardid; |
| 845 | struct device_node *np; |
| 846 | |
| 847 | hardid = get_hard_smp_processor_id(cpu); |
| 848 | |
| 849 | for_each_node_by_type(np, "cpu") { |
| 850 | const u32 *intserv; |
| 851 | unsigned int plen, t; |
| 852 | |
| 853 | /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist |
| 854 | * fallback to "reg" property and assume no threads |
| 855 | */ |
| 856 | intserv = of_get_property(np, "ibm,ppc-interrupt-server#s", |
| 857 | &plen); |
| 858 | if (intserv == NULL) { |
| 859 | const u32 *reg = of_get_property(np, "reg", NULL); |
| 860 | if (reg == NULL) |
| 861 | continue; |
| 862 | if (*reg == hardid) { |
| 863 | if (thread) |
| 864 | *thread = 0; |
| 865 | return np; |
| 866 | } |
| 867 | } else { |
| 868 | plen /= sizeof(u32); |
| 869 | for (t = 0; t < plen; t++) { |
| 870 | if (hardid == intserv[t]) { |
| 871 | if (thread) |
| 872 | *thread = t; |
| 873 | return np; |
| 874 | } |
| 875 | } |
| 876 | } |
| 877 | } |
| 878 | return NULL; |
| 879 | } |
| 880 | EXPORT_SYMBOL(of_get_cpu_node); |
| 881 | |
| 882 | #if defined(CONFIG_DEBUG_FS) && defined(DEBUG) |
| 883 | static struct debugfs_blob_wrapper flat_dt_blob; |
| 884 | |
| 885 | static int __init export_flat_device_tree(void) |
| 886 | { |
| 887 | struct dentry *d; |
| 888 | |
| 889 | flat_dt_blob.data = initial_boot_params; |
| 890 | flat_dt_blob.size = initial_boot_params->totalsize; |
| 891 | |
| 892 | d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR, |
| 893 | powerpc_debugfs_root, &flat_dt_blob); |
| 894 | if (!d) |
| 895 | return 1; |
| 896 | |
| 897 | return 0; |
| 898 | } |
| 899 | __initcall(export_flat_device_tree); |
| 900 | #endif |