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