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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Common boot and setup code for both 32-bit and 64-bit.
4 * Extracted from arch/powerpc/kernel/setup_64.c.
5 *
6 * Copyright (C) 2001 PPC64 Team, IBM Corp
7 */
8
9#undef DEBUG
10
11#include <linux/export.h>
12#include <linux/panic_notifier.h>
13#include <linux/string.h>
14#include <linux/sched.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/reboot.h>
18#include <linux/delay.h>
19#include <linux/initrd.h>
20#include <linux/platform_device.h>
21#include <linux/seq_file.h>
22#include <linux/ioport.h>
23#include <linux/console.h>
24#include <linux/screen_info.h>
25#include <linux/root_dev.h>
26#include <linux/notifier.h>
27#include <linux/cpu.h>
28#include <linux/unistd.h>
29#include <linux/serial.h>
30#include <linux/serial_8250.h>
31#include <linux/percpu.h>
32#include <linux/memblock.h>
33#include <linux/of_platform.h>
34#include <linux/hugetlb.h>
35#include <linux/pgtable.h>
36#include <asm/debugfs.h>
37#include <asm/io.h>
38#include <asm/paca.h>
39#include <asm/prom.h>
40#include <asm/processor.h>
41#include <asm/vdso_datapage.h>
42#include <asm/smp.h>
43#include <asm/elf.h>
44#include <asm/machdep.h>
45#include <asm/time.h>
46#include <asm/cputable.h>
47#include <asm/sections.h>
48#include <asm/firmware.h>
49#include <asm/btext.h>
50#include <asm/nvram.h>
51#include <asm/setup.h>
52#include <asm/rtas.h>
53#include <asm/iommu.h>
54#include <asm/serial.h>
55#include <asm/cache.h>
56#include <asm/page.h>
57#include <asm/mmu.h>
58#include <asm/xmon.h>
59#include <asm/cputhreads.h>
60#include <mm/mmu_decl.h>
61#include <asm/fadump.h>
62#include <asm/udbg.h>
63#include <asm/hugetlb.h>
64#include <asm/livepatch.h>
65#include <asm/mmu_context.h>
66#include <asm/cpu_has_feature.h>
67#include <asm/kasan.h>
68#include <asm/mce.h>
69
70#include "setup.h"
71
72#ifdef DEBUG
73#define DBG(fmt...) udbg_printf(fmt)
74#else
75#define DBG(fmt...)
76#endif
77
78/* The main machine-dep calls structure
79 */
80struct machdep_calls ppc_md;
81EXPORT_SYMBOL(ppc_md);
82struct machdep_calls *machine_id;
83EXPORT_SYMBOL(machine_id);
84
85int boot_cpuid = -1;
86EXPORT_SYMBOL_GPL(boot_cpuid);
87
88/*
89 * These are used in binfmt_elf.c to put aux entries on the stack
90 * for each elf executable being started.
91 */
92int dcache_bsize;
93int icache_bsize;
94
95/*
96 * This still seems to be needed... -- paulus
97 */
98struct screen_info screen_info = {
99 .orig_x = 0,
100 .orig_y = 25,
101 .orig_video_cols = 80,
102 .orig_video_lines = 25,
103 .orig_video_isVGA = 1,
104 .orig_video_points = 16
105};
106#if defined(CONFIG_FB_VGA16_MODULE)
107EXPORT_SYMBOL(screen_info);
108#endif
109
110/* Variables required to store legacy IO irq routing */
111int of_i8042_kbd_irq;
112EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
113int of_i8042_aux_irq;
114EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
115
116#ifdef __DO_IRQ_CANON
117/* XXX should go elsewhere eventually */
118int ppc_do_canonicalize_irqs;
119EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
120#endif
121
122#ifdef CONFIG_CRASH_CORE
123/* This keeps a track of which one is the crashing cpu. */
124int crashing_cpu = -1;
125#endif
126
127/* also used by kexec */
128void machine_shutdown(void)
129{
130 /*
131 * if fadump is active, cleanup the fadump registration before we
132 * shutdown.
133 */
134 fadump_cleanup();
135
136 if (ppc_md.machine_shutdown)
137 ppc_md.machine_shutdown();
138}
139
140static void machine_hang(void)
141{
142 pr_emerg("System Halted, OK to turn off power\n");
143 local_irq_disable();
144 while (1)
145 ;
146}
147
148void machine_restart(char *cmd)
149{
150 machine_shutdown();
151 if (ppc_md.restart)
152 ppc_md.restart(cmd);
153
154 smp_send_stop();
155
156 do_kernel_restart(cmd);
157 mdelay(1000);
158
159 machine_hang();
160}
161
162void machine_power_off(void)
163{
164 machine_shutdown();
165 if (pm_power_off)
166 pm_power_off();
167
168 smp_send_stop();
169 machine_hang();
170}
171/* Used by the G5 thermal driver */
172EXPORT_SYMBOL_GPL(machine_power_off);
173
174void (*pm_power_off)(void);
175EXPORT_SYMBOL_GPL(pm_power_off);
176
177void machine_halt(void)
178{
179 machine_shutdown();
180 if (ppc_md.halt)
181 ppc_md.halt();
182
183 smp_send_stop();
184 machine_hang();
185}
186
187#ifdef CONFIG_SMP
188DEFINE_PER_CPU(unsigned int, cpu_pvr);
189#endif
190
191static void show_cpuinfo_summary(struct seq_file *m)
192{
193 struct device_node *root;
194 const char *model = NULL;
195 unsigned long bogosum = 0;
196 int i;
197
198 if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) {
199 for_each_online_cpu(i)
200 bogosum += loops_per_jiffy;
201 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
202 bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100);
203 }
204 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
205 if (ppc_md.name)
206 seq_printf(m, "platform\t: %s\n", ppc_md.name);
207 root = of_find_node_by_path("/");
208 if (root)
209 model = of_get_property(root, "model", NULL);
210 if (model)
211 seq_printf(m, "model\t\t: %s\n", model);
212 of_node_put(root);
213
214 if (ppc_md.show_cpuinfo != NULL)
215 ppc_md.show_cpuinfo(m);
216
217 /* Display the amount of memory */
218 if (IS_ENABLED(CONFIG_PPC32))
219 seq_printf(m, "Memory\t\t: %d MB\n",
220 (unsigned int)(total_memory / (1024 * 1024)));
221}
222
223static int show_cpuinfo(struct seq_file *m, void *v)
224{
225 unsigned long cpu_id = (unsigned long)v - 1;
226 unsigned int pvr;
227 unsigned long proc_freq;
228 unsigned short maj;
229 unsigned short min;
230
231#ifdef CONFIG_SMP
232 pvr = per_cpu(cpu_pvr, cpu_id);
233#else
234 pvr = mfspr(SPRN_PVR);
235#endif
236 maj = (pvr >> 8) & 0xFF;
237 min = pvr & 0xFF;
238
239 seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id);
240
241 if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
242 seq_puts(m, cur_cpu_spec->cpu_name);
243 else
244 seq_printf(m, "unknown (%08x)", pvr);
245
246 if (cpu_has_feature(CPU_FTR_ALTIVEC))
247 seq_puts(m, ", altivec supported");
248
249 seq_putc(m, '\n');
250
251#ifdef CONFIG_TAU
252 if (cpu_has_feature(CPU_FTR_TAU)) {
253 if (IS_ENABLED(CONFIG_TAU_AVERAGE)) {
254 /* more straightforward, but potentially misleading */
255 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
256 cpu_temp(cpu_id));
257 } else {
258 /* show the actual temp sensor range */
259 u32 temp;
260 temp = cpu_temp_both(cpu_id);
261 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
262 temp & 0xff, temp >> 16);
263 }
264 }
265#endif /* CONFIG_TAU */
266
267 /*
268 * Platforms that have variable clock rates, should implement
269 * the method ppc_md.get_proc_freq() that reports the clock
270 * rate of a given cpu. The rest can use ppc_proc_freq to
271 * report the clock rate that is same across all cpus.
272 */
273 if (ppc_md.get_proc_freq)
274 proc_freq = ppc_md.get_proc_freq(cpu_id);
275 else
276 proc_freq = ppc_proc_freq;
277
278 if (proc_freq)
279 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
280 proc_freq / 1000000, proc_freq % 1000000);
281
282 if (ppc_md.show_percpuinfo != NULL)
283 ppc_md.show_percpuinfo(m, cpu_id);
284
285 /* If we are a Freescale core do a simple check so
286 * we dont have to keep adding cases in the future */
287 if (PVR_VER(pvr) & 0x8000) {
288 switch (PVR_VER(pvr)) {
289 case 0x8000: /* 7441/7450/7451, Voyager */
290 case 0x8001: /* 7445/7455, Apollo 6 */
291 case 0x8002: /* 7447/7457, Apollo 7 */
292 case 0x8003: /* 7447A, Apollo 7 PM */
293 case 0x8004: /* 7448, Apollo 8 */
294 case 0x800c: /* 7410, Nitro */
295 maj = ((pvr >> 8) & 0xF);
296 min = PVR_MIN(pvr);
297 break;
298 default: /* e500/book-e */
299 maj = PVR_MAJ(pvr);
300 min = PVR_MIN(pvr);
301 break;
302 }
303 } else {
304 switch (PVR_VER(pvr)) {
305 case 0x1008: /* 740P/750P ?? */
306 maj = ((pvr >> 8) & 0xFF) - 1;
307 min = pvr & 0xFF;
308 break;
309 case 0x004e: /* POWER9 bits 12-15 give chip type */
310 case 0x0080: /* POWER10 bit 12 gives SMT8/4 */
311 maj = (pvr >> 8) & 0x0F;
312 min = pvr & 0xFF;
313 break;
314 default:
315 maj = (pvr >> 8) & 0xFF;
316 min = pvr & 0xFF;
317 break;
318 }
319 }
320
321 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
322 maj, min, PVR_VER(pvr), PVR_REV(pvr));
323
324 if (IS_ENABLED(CONFIG_PPC32))
325 seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ),
326 (loops_per_jiffy / (5000 / HZ)) % 100);
327
328 seq_putc(m, '\n');
329
330 /* If this is the last cpu, print the summary */
331 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
332 show_cpuinfo_summary(m);
333
334 return 0;
335}
336
337static void *c_start(struct seq_file *m, loff_t *pos)
338{
339 if (*pos == 0) /* just in case, cpu 0 is not the first */
340 *pos = cpumask_first(cpu_online_mask);
341 else
342 *pos = cpumask_next(*pos - 1, cpu_online_mask);
343 if ((*pos) < nr_cpu_ids)
344 return (void *)(unsigned long)(*pos + 1);
345 return NULL;
346}
347
348static void *c_next(struct seq_file *m, void *v, loff_t *pos)
349{
350 (*pos)++;
351 return c_start(m, pos);
352}
353
354static void c_stop(struct seq_file *m, void *v)
355{
356}
357
358const struct seq_operations cpuinfo_op = {
359 .start = c_start,
360 .next = c_next,
361 .stop = c_stop,
362 .show = show_cpuinfo,
363};
364
365void __init check_for_initrd(void)
366{
367#ifdef CONFIG_BLK_DEV_INITRD
368 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
369 initrd_start, initrd_end);
370
371 /* If we were passed an initrd, set the ROOT_DEV properly if the values
372 * look sensible. If not, clear initrd reference.
373 */
374 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
375 initrd_end > initrd_start)
376 ROOT_DEV = Root_RAM0;
377 else
378 initrd_start = initrd_end = 0;
379
380 if (initrd_start)
381 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
382
383 DBG(" <- check_for_initrd()\n");
384#endif /* CONFIG_BLK_DEV_INITRD */
385}
386
387#ifdef CONFIG_SMP
388
389int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
390cpumask_t threads_core_mask __read_mostly;
391EXPORT_SYMBOL_GPL(threads_per_core);
392EXPORT_SYMBOL_GPL(threads_per_subcore);
393EXPORT_SYMBOL_GPL(threads_shift);
394EXPORT_SYMBOL_GPL(threads_core_mask);
395
396static void __init cpu_init_thread_core_maps(int tpc)
397{
398 int i;
399
400 threads_per_core = tpc;
401 threads_per_subcore = tpc;
402 cpumask_clear(&threads_core_mask);
403
404 /* This implementation only supports power of 2 number of threads
405 * for simplicity and performance
406 */
407 threads_shift = ilog2(tpc);
408 BUG_ON(tpc != (1 << threads_shift));
409
410 for (i = 0; i < tpc; i++)
411 cpumask_set_cpu(i, &threads_core_mask);
412
413 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
414 tpc, tpc > 1 ? "s" : "");
415 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
416}
417
418
419u32 *cpu_to_phys_id = NULL;
420
421/**
422 * setup_cpu_maps - initialize the following cpu maps:
423 * cpu_possible_mask
424 * cpu_present_mask
425 *
426 * Having the possible map set up early allows us to restrict allocations
427 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
428 *
429 * We do not initialize the online map here; cpus set their own bits in
430 * cpu_online_mask as they come up.
431 *
432 * This function is valid only for Open Firmware systems. finish_device_tree
433 * must be called before using this.
434 *
435 * While we're here, we may as well set the "physical" cpu ids in the paca.
436 *
437 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
438 */
439void __init smp_setup_cpu_maps(void)
440{
441 struct device_node *dn;
442 int cpu = 0;
443 int nthreads = 1;
444
445 DBG("smp_setup_cpu_maps()\n");
446
447 cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32),
448 __alignof__(u32));
449 if (!cpu_to_phys_id)
450 panic("%s: Failed to allocate %zu bytes align=0x%zx\n",
451 __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32));
452
453 for_each_node_by_type(dn, "cpu") {
454 const __be32 *intserv;
455 __be32 cpu_be;
456 int j, len;
457
458 DBG(" * %pOF...\n", dn);
459
460 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
461 &len);
462 if (intserv) {
463 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
464 nthreads);
465 } else {
466 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
467 intserv = of_get_property(dn, "reg", &len);
468 if (!intserv) {
469 cpu_be = cpu_to_be32(cpu);
470 /* XXX: what is this? uninitialized?? */
471 intserv = &cpu_be; /* assume logical == phys */
472 len = 4;
473 }
474 }
475
476 nthreads = len / sizeof(int);
477
478 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
479 bool avail;
480
481 DBG(" thread %d -> cpu %d (hard id %d)\n",
482 j, cpu, be32_to_cpu(intserv[j]));
483
484 avail = of_device_is_available(dn);
485 if (!avail)
486 avail = !of_property_match_string(dn,
487 "enable-method", "spin-table");
488
489 set_cpu_present(cpu, avail);
490 set_cpu_possible(cpu, true);
491 cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]);
492 cpu++;
493 }
494
495 if (cpu >= nr_cpu_ids) {
496 of_node_put(dn);
497 break;
498 }
499 }
500
501 /* If no SMT supported, nthreads is forced to 1 */
502 if (!cpu_has_feature(CPU_FTR_SMT)) {
503 DBG(" SMT disabled ! nthreads forced to 1\n");
504 nthreads = 1;
505 }
506
507#ifdef CONFIG_PPC64
508 /*
509 * On pSeries LPAR, we need to know how many cpus
510 * could possibly be added to this partition.
511 */
512 if (firmware_has_feature(FW_FEATURE_LPAR) &&
513 (dn = of_find_node_by_path("/rtas"))) {
514 int num_addr_cell, num_size_cell, maxcpus;
515 const __be32 *ireg;
516
517 num_addr_cell = of_n_addr_cells(dn);
518 num_size_cell = of_n_size_cells(dn);
519
520 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
521
522 if (!ireg)
523 goto out;
524
525 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
526
527 /* Double maxcpus for processors which have SMT capability */
528 if (cpu_has_feature(CPU_FTR_SMT))
529 maxcpus *= nthreads;
530
531 if (maxcpus > nr_cpu_ids) {
532 printk(KERN_WARNING
533 "Partition configured for %d cpus, "
534 "operating system maximum is %u.\n",
535 maxcpus, nr_cpu_ids);
536 maxcpus = nr_cpu_ids;
537 } else
538 printk(KERN_INFO "Partition configured for %d cpus.\n",
539 maxcpus);
540
541 for (cpu = 0; cpu < maxcpus; cpu++)
542 set_cpu_possible(cpu, true);
543 out:
544 of_node_put(dn);
545 }
546 vdso_data->processorCount = num_present_cpus();
547#endif /* CONFIG_PPC64 */
548
549 /* Initialize CPU <=> thread mapping/
550 *
551 * WARNING: We assume that the number of threads is the same for
552 * every CPU in the system. If that is not the case, then some code
553 * here will have to be reworked
554 */
555 cpu_init_thread_core_maps(nthreads);
556
557 /* Now that possible cpus are set, set nr_cpu_ids for later use */
558 setup_nr_cpu_ids();
559
560 free_unused_pacas();
561}
562#endif /* CONFIG_SMP */
563
564#ifdef CONFIG_PCSPKR_PLATFORM
565static __init int add_pcspkr(void)
566{
567 struct device_node *np;
568 struct platform_device *pd;
569 int ret;
570
571 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
572 of_node_put(np);
573 if (!np)
574 return -ENODEV;
575
576 pd = platform_device_alloc("pcspkr", -1);
577 if (!pd)
578 return -ENOMEM;
579
580 ret = platform_device_add(pd);
581 if (ret)
582 platform_device_put(pd);
583
584 return ret;
585}
586device_initcall(add_pcspkr);
587#endif /* CONFIG_PCSPKR_PLATFORM */
588
589void probe_machine(void)
590{
591 extern struct machdep_calls __machine_desc_start;
592 extern struct machdep_calls __machine_desc_end;
593 unsigned int i;
594
595 /*
596 * Iterate all ppc_md structures until we find the proper
597 * one for the current machine type
598 */
599 DBG("Probing machine type ...\n");
600
601 /*
602 * Check ppc_md is empty, if not we have a bug, ie, we setup an
603 * entry before probe_machine() which will be overwritten
604 */
605 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
606 if (((void **)&ppc_md)[i]) {
607 printk(KERN_ERR "Entry %d in ppc_md non empty before"
608 " machine probe !\n", i);
609 }
610 }
611
612 for (machine_id = &__machine_desc_start;
613 machine_id < &__machine_desc_end;
614 machine_id++) {
615 DBG(" %s ...", machine_id->name);
616 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
617 if (ppc_md.probe()) {
618 DBG(" match !\n");
619 break;
620 }
621 DBG("\n");
622 }
623 /* What can we do if we didn't find ? */
624 if (machine_id >= &__machine_desc_end) {
625 pr_err("No suitable machine description found !\n");
626 for (;;);
627 }
628
629 printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
630}
631
632/* Match a class of boards, not a specific device configuration. */
633int check_legacy_ioport(unsigned long base_port)
634{
635 struct device_node *parent, *np = NULL;
636 int ret = -ENODEV;
637
638 switch(base_port) {
639 case I8042_DATA_REG:
640 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
641 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
642 if (np) {
643 parent = of_get_parent(np);
644
645 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
646 if (!of_i8042_kbd_irq)
647 of_i8042_kbd_irq = 1;
648
649 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
650 if (!of_i8042_aux_irq)
651 of_i8042_aux_irq = 12;
652
653 of_node_put(np);
654 np = parent;
655 break;
656 }
657 np = of_find_node_by_type(NULL, "8042");
658 /* Pegasos has no device_type on its 8042 node, look for the
659 * name instead */
660 if (!np)
661 np = of_find_node_by_name(NULL, "8042");
662 if (np) {
663 of_i8042_kbd_irq = 1;
664 of_i8042_aux_irq = 12;
665 }
666 break;
667 case FDC_BASE: /* FDC1 */
668 np = of_find_node_by_type(NULL, "fdc");
669 break;
670 default:
671 /* ipmi is supposed to fail here */
672 break;
673 }
674 if (!np)
675 return ret;
676 parent = of_get_parent(np);
677 if (parent) {
678 if (of_node_is_type(parent, "isa"))
679 ret = 0;
680 of_node_put(parent);
681 }
682 of_node_put(np);
683 return ret;
684}
685EXPORT_SYMBOL(check_legacy_ioport);
686
687static int ppc_panic_event(struct notifier_block *this,
688 unsigned long event, void *ptr)
689{
690 /*
691 * panic does a local_irq_disable, but we really
692 * want interrupts to be hard disabled.
693 */
694 hard_irq_disable();
695
696 /*
697 * If firmware-assisted dump has been registered then trigger
698 * firmware-assisted dump and let firmware handle everything else.
699 */
700 crash_fadump(NULL, ptr);
701 if (ppc_md.panic)
702 ppc_md.panic(ptr); /* May not return */
703 return NOTIFY_DONE;
704}
705
706static struct notifier_block ppc_panic_block = {
707 .notifier_call = ppc_panic_event,
708 .priority = INT_MIN /* may not return; must be done last */
709};
710
711/*
712 * Dump out kernel offset information on panic.
713 */
714static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
715 void *p)
716{
717 pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
718 kaslr_offset(), KERNELBASE);
719
720 return 0;
721}
722
723static struct notifier_block kernel_offset_notifier = {
724 .notifier_call = dump_kernel_offset
725};
726
727void __init setup_panic(void)
728{
729 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0)
730 atomic_notifier_chain_register(&panic_notifier_list,
731 &kernel_offset_notifier);
732
733 /* PPC64 always does a hard irq disable in its panic handler */
734 if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic)
735 return;
736 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
737}
738
739#ifdef CONFIG_CHECK_CACHE_COHERENCY
740/*
741 * For platforms that have configurable cache-coherency. This function
742 * checks that the cache coherency setting of the kernel matches the setting
743 * left by the firmware, as indicated in the device tree. Since a mismatch
744 * will eventually result in DMA failures, we print * and error and call
745 * BUG() in that case.
746 */
747
748#define KERNEL_COHERENCY (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
749
750static int __init check_cache_coherency(void)
751{
752 struct device_node *np;
753 const void *prop;
754 bool devtree_coherency;
755
756 np = of_find_node_by_path("/");
757 prop = of_get_property(np, "coherency-off", NULL);
758 of_node_put(np);
759
760 devtree_coherency = prop ? false : true;
761
762 if (devtree_coherency != KERNEL_COHERENCY) {
763 printk(KERN_ERR
764 "kernel coherency:%s != device tree_coherency:%s\n",
765 KERNEL_COHERENCY ? "on" : "off",
766 devtree_coherency ? "on" : "off");
767 BUG();
768 }
769
770 return 0;
771}
772
773late_initcall(check_cache_coherency);
774#endif /* CONFIG_CHECK_CACHE_COHERENCY */
775
776#ifdef CONFIG_DEBUG_FS
777struct dentry *powerpc_debugfs_root;
778EXPORT_SYMBOL(powerpc_debugfs_root);
779
780static int powerpc_debugfs_init(void)
781{
782 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
783 return 0;
784}
785arch_initcall(powerpc_debugfs_init);
786#endif
787
788void ppc_printk_progress(char *s, unsigned short hex)
789{
790 pr_info("%s\n", s);
791}
792
793static __init void print_system_info(void)
794{
795 pr_info("-----------------------------------------------------\n");
796 pr_info("phys_mem_size = 0x%llx\n",
797 (unsigned long long)memblock_phys_mem_size());
798
799 pr_info("dcache_bsize = 0x%x\n", dcache_bsize);
800 pr_info("icache_bsize = 0x%x\n", icache_bsize);
801
802 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features);
803 pr_info(" possible = 0x%016lx\n",
804 (unsigned long)CPU_FTRS_POSSIBLE);
805 pr_info(" always = 0x%016lx\n",
806 (unsigned long)CPU_FTRS_ALWAYS);
807 pr_info("cpu_user_features = 0x%08x 0x%08x\n",
808 cur_cpu_spec->cpu_user_features,
809 cur_cpu_spec->cpu_user_features2);
810 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features);
811#ifdef CONFIG_PPC64
812 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
813#ifdef CONFIG_PPC_BOOK3S
814 pr_info("vmalloc start = 0x%lx\n", KERN_VIRT_START);
815 pr_info("IO start = 0x%lx\n", KERN_IO_START);
816 pr_info("vmemmap start = 0x%lx\n", (unsigned long)vmemmap);
817#endif
818#endif
819
820 if (!early_radix_enabled())
821 print_system_hash_info();
822
823 if (PHYSICAL_START > 0)
824 pr_info("physical_start = 0x%llx\n",
825 (unsigned long long)PHYSICAL_START);
826 pr_info("-----------------------------------------------------\n");
827}
828
829#ifdef CONFIG_SMP
830static void __init smp_setup_pacas(void)
831{
832 int cpu;
833
834 for_each_possible_cpu(cpu) {
835 if (cpu == smp_processor_id())
836 continue;
837 allocate_paca(cpu);
838 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
839 }
840
841 memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32));
842 cpu_to_phys_id = NULL;
843}
844#endif
845
846/*
847 * Called into from start_kernel this initializes memblock, which is used
848 * to manage page allocation until mem_init is called.
849 */
850void __init setup_arch(char **cmdline_p)
851{
852 kasan_init();
853
854 *cmdline_p = boot_command_line;
855
856 /* Set a half-reasonable default so udelay does something sensible */
857 loops_per_jiffy = 500000000 / HZ;
858
859 /* Unflatten the device-tree passed by prom_init or kexec */
860 unflatten_device_tree();
861
862 /*
863 * Initialize cache line/block info from device-tree (on ppc64) or
864 * just cputable (on ppc32).
865 */
866 initialize_cache_info();
867
868 /* Initialize RTAS if available. */
869 rtas_initialize();
870
871 /* Check if we have an initrd provided via the device-tree. */
872 check_for_initrd();
873
874 /* Probe the machine type, establish ppc_md. */
875 probe_machine();
876
877 /* Setup panic notifier if requested by the platform. */
878 setup_panic();
879
880 /*
881 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
882 * it from their respective probe() function.
883 */
884 setup_power_save();
885
886 /* Discover standard serial ports. */
887 find_legacy_serial_ports();
888
889 /* Register early console with the printk subsystem. */
890 register_early_udbg_console();
891
892 /* Setup the various CPU maps based on the device-tree. */
893 smp_setup_cpu_maps();
894
895 /* Initialize xmon. */
896 xmon_setup();
897
898 /* Check the SMT related command line arguments (ppc64). */
899 check_smt_enabled();
900
901 /* Parse memory topology */
902 mem_topology_setup();
903
904 /*
905 * Release secondary cpus out of their spinloops at 0x60 now that
906 * we can map physical -> logical CPU ids.
907 *
908 * Freescale Book3e parts spin in a loop provided by firmware,
909 * so smp_release_cpus() does nothing for them.
910 */
911#ifdef CONFIG_SMP
912 smp_setup_pacas();
913
914 /* On BookE, setup per-core TLB data structures. */
915 setup_tlb_core_data();
916#endif
917
918 /* Print various info about the machine that has been gathered so far. */
919 print_system_info();
920
921 /* Reserve large chunks of memory for use by CMA for KVM. */
922 kvm_cma_reserve();
923
924 /* Reserve large chunks of memory for us by CMA for hugetlb */
925 gigantic_hugetlb_cma_reserve();
926
927 klp_init_thread_info(&init_task);
928
929 setup_initial_init_mm(_stext, _etext, _edata, _end);
930
931 mm_iommu_init(&init_mm);
932 irqstack_early_init();
933 exc_lvl_early_init();
934 emergency_stack_init();
935
936 mce_init();
937 smp_release_cpus();
938
939 initmem_init();
940
941 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
942
943 if (ppc_md.setup_arch)
944 ppc_md.setup_arch();
945
946 setup_barrier_nospec();
947 setup_spectre_v2();
948
949 paging_init();
950
951 /* Initialize the MMU context management stuff. */
952 mmu_context_init();
953
954 /* Interrupt code needs to be 64K-aligned. */
955 if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff)
956 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
957 (unsigned long)_stext);
958}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Common boot and setup code for both 32-bit and 64-bit.
4 * Extracted from arch/powerpc/kernel/setup_64.c.
5 *
6 * Copyright (C) 2001 PPC64 Team, IBM Corp
7 */
8
9#undef DEBUG
10
11#include <linux/export.h>
12#include <linux/panic_notifier.h>
13#include <linux/string.h>
14#include <linux/sched.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/reboot.h>
18#include <linux/delay.h>
19#include <linux/initrd.h>
20#include <linux/platform_device.h>
21#include <linux/printk.h>
22#include <linux/seq_file.h>
23#include <linux/ioport.h>
24#include <linux/console.h>
25#include <linux/root_dev.h>
26#include <linux/cpu.h>
27#include <linux/unistd.h>
28#include <linux/seq_buf.h>
29#include <linux/serial.h>
30#include <linux/serial_8250.h>
31#include <linux/percpu.h>
32#include <linux/memblock.h>
33#include <linux/of.h>
34#include <linux/of_fdt.h>
35#include <linux/of_irq.h>
36#include <linux/hugetlb.h>
37#include <linux/pgtable.h>
38#include <asm/io.h>
39#include <asm/paca.h>
40#include <asm/processor.h>
41#include <asm/vdso_datapage.h>
42#include <asm/smp.h>
43#include <asm/elf.h>
44#include <asm/machdep.h>
45#include <asm/time.h>
46#include <asm/cputable.h>
47#include <asm/sections.h>
48#include <asm/firmware.h>
49#include <asm/btext.h>
50#include <asm/nvram.h>
51#include <asm/setup.h>
52#include <asm/rtas.h>
53#include <asm/iommu.h>
54#include <asm/serial.h>
55#include <asm/cache.h>
56#include <asm/page.h>
57#include <asm/mmu.h>
58#include <asm/xmon.h>
59#include <asm/cputhreads.h>
60#include <mm/mmu_decl.h>
61#include <asm/archrandom.h>
62#include <asm/fadump.h>
63#include <asm/udbg.h>
64#include <asm/hugetlb.h>
65#include <asm/livepatch.h>
66#include <asm/mmu_context.h>
67#include <asm/cpu_has_feature.h>
68#include <asm/kasan.h>
69#include <asm/mce.h>
70
71#include "setup.h"
72
73#ifdef DEBUG
74#define DBG(fmt...) udbg_printf(fmt)
75#else
76#define DBG(fmt...)
77#endif
78
79/* The main machine-dep calls structure
80 */
81struct machdep_calls ppc_md;
82EXPORT_SYMBOL(ppc_md);
83struct machdep_calls *machine_id;
84EXPORT_SYMBOL(machine_id);
85
86int boot_cpuid = -1;
87EXPORT_SYMBOL_GPL(boot_cpuid);
88int __initdata boot_core_hwid = -1;
89
90#ifdef CONFIG_PPC64
91int boot_cpu_hwid = -1;
92#endif
93
94/*
95 * These are used in binfmt_elf.c to put aux entries on the stack
96 * for each elf executable being started.
97 */
98int dcache_bsize;
99int icache_bsize;
100
101/* Variables required to store legacy IO irq routing */
102int of_i8042_kbd_irq;
103EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
104int of_i8042_aux_irq;
105EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
106
107#ifdef __DO_IRQ_CANON
108/* XXX should go elsewhere eventually */
109int ppc_do_canonicalize_irqs;
110EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
111#endif
112
113#ifdef CONFIG_CRASH_DUMP
114/* This keeps a track of which one is the crashing cpu. */
115int crashing_cpu = -1;
116#endif
117
118/* also used by kexec */
119void machine_shutdown(void)
120{
121 /*
122 * if fadump is active, cleanup the fadump registration before we
123 * shutdown.
124 */
125 fadump_cleanup();
126
127 if (ppc_md.machine_shutdown)
128 ppc_md.machine_shutdown();
129}
130
131static void machine_hang(void)
132{
133 pr_emerg("System Halted, OK to turn off power\n");
134 local_irq_disable();
135 while (1)
136 ;
137}
138
139void machine_restart(char *cmd)
140{
141 machine_shutdown();
142 if (ppc_md.restart)
143 ppc_md.restart(cmd);
144
145 smp_send_stop();
146
147 do_kernel_restart(cmd);
148 mdelay(1000);
149
150 machine_hang();
151}
152
153void machine_power_off(void)
154{
155 machine_shutdown();
156 do_kernel_power_off();
157 smp_send_stop();
158 machine_hang();
159}
160/* Used by the G5 thermal driver */
161EXPORT_SYMBOL_GPL(machine_power_off);
162
163void (*pm_power_off)(void);
164EXPORT_SYMBOL_GPL(pm_power_off);
165
166size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs)
167{
168 if (max_longs && ppc_md.get_random_seed && ppc_md.get_random_seed(v))
169 return 1;
170 return 0;
171}
172EXPORT_SYMBOL(arch_get_random_seed_longs);
173
174void machine_halt(void)
175{
176 machine_shutdown();
177 if (ppc_md.halt)
178 ppc_md.halt();
179
180 smp_send_stop();
181 machine_hang();
182}
183
184#ifdef CONFIG_SMP
185DEFINE_PER_CPU(unsigned int, cpu_pvr);
186#endif
187
188static void show_cpuinfo_summary(struct seq_file *m)
189{
190 struct device_node *root;
191 const char *model = NULL;
192 unsigned long bogosum = 0;
193 int i;
194
195 if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) {
196 for_each_online_cpu(i)
197 bogosum += loops_per_jiffy;
198 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
199 bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100);
200 }
201 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
202 if (ppc_md.name)
203 seq_printf(m, "platform\t: %s\n", ppc_md.name);
204 root = of_find_node_by_path("/");
205 if (root)
206 model = of_get_property(root, "model", NULL);
207 if (model)
208 seq_printf(m, "model\t\t: %s\n", model);
209 of_node_put(root);
210
211 if (ppc_md.show_cpuinfo != NULL)
212 ppc_md.show_cpuinfo(m);
213
214 /* Display the amount of memory */
215 if (IS_ENABLED(CONFIG_PPC32))
216 seq_printf(m, "Memory\t\t: %d MB\n",
217 (unsigned int)(total_memory / (1024 * 1024)));
218}
219
220static int show_cpuinfo(struct seq_file *m, void *v)
221{
222 unsigned long cpu_id = (unsigned long)v - 1;
223 unsigned int pvr;
224 unsigned long proc_freq;
225 unsigned short maj;
226 unsigned short min;
227
228#ifdef CONFIG_SMP
229 pvr = per_cpu(cpu_pvr, cpu_id);
230#else
231 pvr = mfspr(SPRN_PVR);
232#endif
233 maj = (pvr >> 8) & 0xFF;
234 min = pvr & 0xFF;
235
236 seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id);
237
238 if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
239 seq_puts(m, cur_cpu_spec->cpu_name);
240 else
241 seq_printf(m, "unknown (%08x)", pvr);
242
243 if (cpu_has_feature(CPU_FTR_ALTIVEC))
244 seq_puts(m, ", altivec supported");
245
246 seq_putc(m, '\n');
247
248#ifdef CONFIG_TAU
249 if (cpu_has_feature(CPU_FTR_TAU)) {
250 if (IS_ENABLED(CONFIG_TAU_AVERAGE)) {
251 /* more straightforward, but potentially misleading */
252 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
253 cpu_temp(cpu_id));
254 } else {
255 /* show the actual temp sensor range */
256 u32 temp;
257 temp = cpu_temp_both(cpu_id);
258 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
259 temp & 0xff, temp >> 16);
260 }
261 }
262#endif /* CONFIG_TAU */
263
264 /*
265 * Platforms that have variable clock rates, should implement
266 * the method ppc_md.get_proc_freq() that reports the clock
267 * rate of a given cpu. The rest can use ppc_proc_freq to
268 * report the clock rate that is same across all cpus.
269 */
270 if (ppc_md.get_proc_freq)
271 proc_freq = ppc_md.get_proc_freq(cpu_id);
272 else
273 proc_freq = ppc_proc_freq;
274
275 if (proc_freq)
276 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
277 proc_freq / 1000000, proc_freq % 1000000);
278
279 /* If we are a Freescale core do a simple check so
280 * we don't have to keep adding cases in the future */
281 if (PVR_VER(pvr) & 0x8000) {
282 switch (PVR_VER(pvr)) {
283 case 0x8000: /* 7441/7450/7451, Voyager */
284 case 0x8001: /* 7445/7455, Apollo 6 */
285 case 0x8002: /* 7447/7457, Apollo 7 */
286 case 0x8003: /* 7447A, Apollo 7 PM */
287 case 0x8004: /* 7448, Apollo 8 */
288 case 0x800c: /* 7410, Nitro */
289 maj = ((pvr >> 8) & 0xF);
290 min = PVR_MIN(pvr);
291 break;
292 default: /* e500/book-e */
293 maj = PVR_MAJ(pvr);
294 min = PVR_MIN(pvr);
295 break;
296 }
297 } else {
298 switch (PVR_VER(pvr)) {
299 case 0x1008: /* 740P/750P ?? */
300 maj = ((pvr >> 8) & 0xFF) - 1;
301 min = pvr & 0xFF;
302 break;
303 case 0x004e: /* POWER9 bits 12-15 give chip type */
304 case 0x0080: /* POWER10 bit 12 gives SMT8/4 */
305 maj = (pvr >> 8) & 0x0F;
306 min = pvr & 0xFF;
307 break;
308 default:
309 maj = (pvr >> 8) & 0xFF;
310 min = pvr & 0xFF;
311 break;
312 }
313 }
314
315 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
316 maj, min, PVR_VER(pvr), PVR_REV(pvr));
317
318 if (IS_ENABLED(CONFIG_PPC32))
319 seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ),
320 (loops_per_jiffy / (5000 / HZ)) % 100);
321
322 seq_putc(m, '\n');
323
324 /* If this is the last cpu, print the summary */
325 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
326 show_cpuinfo_summary(m);
327
328 return 0;
329}
330
331static void *c_start(struct seq_file *m, loff_t *pos)
332{
333 if (*pos == 0) /* just in case, cpu 0 is not the first */
334 *pos = cpumask_first(cpu_online_mask);
335 else
336 *pos = cpumask_next(*pos - 1, cpu_online_mask);
337 if ((*pos) < nr_cpu_ids)
338 return (void *)(unsigned long)(*pos + 1);
339 return NULL;
340}
341
342static void *c_next(struct seq_file *m, void *v, loff_t *pos)
343{
344 (*pos)++;
345 return c_start(m, pos);
346}
347
348static void c_stop(struct seq_file *m, void *v)
349{
350}
351
352const struct seq_operations cpuinfo_op = {
353 .start = c_start,
354 .next = c_next,
355 .stop = c_stop,
356 .show = show_cpuinfo,
357};
358
359void __init check_for_initrd(void)
360{
361#ifdef CONFIG_BLK_DEV_INITRD
362 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
363 initrd_start, initrd_end);
364
365 /* If we were passed an initrd, set the ROOT_DEV properly if the values
366 * look sensible. If not, clear initrd reference.
367 */
368 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
369 initrd_end > initrd_start)
370 ROOT_DEV = Root_RAM0;
371 else
372 initrd_start = initrd_end = 0;
373
374 if (initrd_start)
375 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
376
377 DBG(" <- check_for_initrd()\n");
378#endif /* CONFIG_BLK_DEV_INITRD */
379}
380
381#ifdef CONFIG_SMP
382
383int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
384cpumask_t threads_core_mask __read_mostly;
385EXPORT_SYMBOL_GPL(threads_per_core);
386EXPORT_SYMBOL_GPL(threads_per_subcore);
387EXPORT_SYMBOL_GPL(threads_shift);
388EXPORT_SYMBOL_GPL(threads_core_mask);
389
390static void __init cpu_init_thread_core_maps(int tpc)
391{
392 int i;
393
394 threads_per_core = tpc;
395 threads_per_subcore = tpc;
396 cpumask_clear(&threads_core_mask);
397
398 /* This implementation only supports power of 2 number of threads
399 * for simplicity and performance
400 */
401 threads_shift = ilog2(tpc);
402 BUG_ON(tpc != (1 << threads_shift));
403
404 for (i = 0; i < tpc; i++)
405 cpumask_set_cpu(i, &threads_core_mask);
406
407 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
408 tpc, tpc > 1 ? "s" : "");
409 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
410}
411
412
413u32 *cpu_to_phys_id = NULL;
414
415static int assign_threads(unsigned int cpu, unsigned int nthreads, bool present,
416 const __be32 *hw_ids)
417{
418 for (int i = 0; i < nthreads && cpu < nr_cpu_ids; i++) {
419 __be32 hwid;
420
421 hwid = be32_to_cpu(hw_ids[i]);
422
423 DBG(" thread %d -> cpu %d (hard id %d)\n", i, cpu, hwid);
424
425 set_cpu_present(cpu, present);
426 set_cpu_possible(cpu, true);
427 cpu_to_phys_id[cpu] = hwid;
428 cpu++;
429 }
430
431 return cpu;
432}
433
434/**
435 * setup_cpu_maps - initialize the following cpu maps:
436 * cpu_possible_mask
437 * cpu_present_mask
438 *
439 * Having the possible map set up early allows us to restrict allocations
440 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
441 *
442 * We do not initialize the online map here; cpus set their own bits in
443 * cpu_online_mask as they come up.
444 *
445 * This function is valid only for Open Firmware systems. finish_device_tree
446 * must be called before using this.
447 *
448 * While we're here, we may as well set the "physical" cpu ids in the paca.
449 *
450 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
451 */
452void __init smp_setup_cpu_maps(void)
453{
454 struct device_node *dn;
455 int cpu = 0;
456 int nthreads = 1;
457
458 DBG("smp_setup_cpu_maps()\n");
459
460 cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32),
461 __alignof__(u32));
462 if (!cpu_to_phys_id)
463 panic("%s: Failed to allocate %zu bytes align=0x%zx\n",
464 __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32));
465
466 for_each_node_by_type(dn, "cpu") {
467 const __be32 *intserv;
468 __be32 cpu_be;
469 int len;
470
471 DBG(" * %pOF...\n", dn);
472
473 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
474 &len);
475 if (intserv) {
476 DBG(" ibm,ppc-interrupt-server#s -> %lu threads\n",
477 (len / sizeof(int)));
478 } else {
479 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
480 intserv = of_get_property(dn, "reg", &len);
481 if (!intserv) {
482 cpu_be = cpu_to_be32(cpu);
483 /* XXX: what is this? uninitialized?? */
484 intserv = &cpu_be; /* assume logical == phys */
485 len = 4;
486 }
487 }
488
489 nthreads = len / sizeof(int);
490
491 bool avail = of_device_is_available(dn);
492 if (!avail)
493 avail = !of_property_match_string(dn,
494 "enable-method", "spin-table");
495
496 if (boot_core_hwid >= 0) {
497 if (cpu == 0) {
498 pr_info("Skipping CPU node %pOF to allow for boot core.\n", dn);
499 cpu = nthreads;
500 continue;
501 }
502
503 if (be32_to_cpu(intserv[0]) == boot_core_hwid) {
504 pr_info("Renumbered boot core %pOF to logical 0\n", dn);
505 assign_threads(0, nthreads, avail, intserv);
506 of_node_put(dn);
507 break;
508 }
509 } else if (cpu >= nr_cpu_ids) {
510 of_node_put(dn);
511 break;
512 }
513
514 if (cpu < nr_cpu_ids)
515 cpu = assign_threads(cpu, nthreads, avail, intserv);
516 }
517
518 /* If no SMT supported, nthreads is forced to 1 */
519 if (!cpu_has_feature(CPU_FTR_SMT)) {
520 DBG(" SMT disabled ! nthreads forced to 1\n");
521 nthreads = 1;
522 }
523
524#ifdef CONFIG_PPC64
525 /*
526 * On pSeries LPAR, we need to know how many cpus
527 * could possibly be added to this partition.
528 */
529 if (firmware_has_feature(FW_FEATURE_LPAR) &&
530 (dn = of_find_node_by_path("/rtas"))) {
531 int num_addr_cell, num_size_cell, maxcpus;
532 const __be32 *ireg;
533
534 num_addr_cell = of_n_addr_cells(dn);
535 num_size_cell = of_n_size_cells(dn);
536
537 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
538
539 if (!ireg)
540 goto out;
541
542 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
543
544 /* Double maxcpus for processors which have SMT capability */
545 if (cpu_has_feature(CPU_FTR_SMT))
546 maxcpus *= nthreads;
547
548 if (maxcpus > nr_cpu_ids) {
549 printk(KERN_WARNING
550 "Partition configured for %d cpus, "
551 "operating system maximum is %u.\n",
552 maxcpus, nr_cpu_ids);
553 maxcpus = nr_cpu_ids;
554 } else
555 printk(KERN_INFO "Partition configured for %d cpus.\n",
556 maxcpus);
557
558 for (cpu = 0; cpu < maxcpus; cpu++)
559 set_cpu_possible(cpu, true);
560 out:
561 of_node_put(dn);
562 }
563 vdso_data->processorCount = num_present_cpus();
564#endif /* CONFIG_PPC64 */
565
566 /* Initialize CPU <=> thread mapping/
567 *
568 * WARNING: We assume that the number of threads is the same for
569 * every CPU in the system. If that is not the case, then some code
570 * here will have to be reworked
571 */
572 cpu_init_thread_core_maps(nthreads);
573
574 /* Now that possible cpus are set, set nr_cpu_ids for later use */
575 setup_nr_cpu_ids();
576
577 free_unused_pacas();
578}
579#endif /* CONFIG_SMP */
580
581#ifdef CONFIG_PCSPKR_PLATFORM
582static __init int add_pcspkr(void)
583{
584 struct device_node *np;
585 struct platform_device *pd;
586 int ret;
587
588 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
589 of_node_put(np);
590 if (!np)
591 return -ENODEV;
592
593 pd = platform_device_alloc("pcspkr", -1);
594 if (!pd)
595 return -ENOMEM;
596
597 ret = platform_device_add(pd);
598 if (ret)
599 platform_device_put(pd);
600
601 return ret;
602}
603device_initcall(add_pcspkr);
604#endif /* CONFIG_PCSPKR_PLATFORM */
605
606static char ppc_hw_desc_buf[128] __initdata;
607
608struct seq_buf ppc_hw_desc __initdata = {
609 .buffer = ppc_hw_desc_buf,
610 .size = sizeof(ppc_hw_desc_buf),
611 .len = 0,
612};
613
614static __init void probe_machine(void)
615{
616 extern struct machdep_calls __machine_desc_start;
617 extern struct machdep_calls __machine_desc_end;
618 unsigned int i;
619
620 /*
621 * Iterate all ppc_md structures until we find the proper
622 * one for the current machine type
623 */
624 DBG("Probing machine type ...\n");
625
626 /*
627 * Check ppc_md is empty, if not we have a bug, ie, we setup an
628 * entry before probe_machine() which will be overwritten
629 */
630 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
631 if (((void **)&ppc_md)[i]) {
632 printk(KERN_ERR "Entry %d in ppc_md non empty before"
633 " machine probe !\n", i);
634 }
635 }
636
637 for (machine_id = &__machine_desc_start;
638 machine_id < &__machine_desc_end;
639 machine_id++) {
640 DBG(" %s ...\n", machine_id->name);
641 if (machine_id->compatible && !of_machine_is_compatible(machine_id->compatible))
642 continue;
643 if (machine_id->compatibles && !of_machine_compatible_match(machine_id->compatibles))
644 continue;
645 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
646 if (ppc_md.probe && !ppc_md.probe())
647 continue;
648 DBG(" %s match !\n", machine_id->name);
649 break;
650 }
651 /* What can we do if we didn't find ? */
652 if (machine_id >= &__machine_desc_end) {
653 pr_err("No suitable machine description found !\n");
654 for (;;);
655 }
656
657 // Append the machine name to other info we've gathered
658 seq_buf_puts(&ppc_hw_desc, ppc_md.name);
659
660 // Set the generic hardware description shown in oopses
661 dump_stack_set_arch_desc(ppc_hw_desc.buffer);
662
663 pr_info("Hardware name: %s\n", ppc_hw_desc.buffer);
664}
665
666/* Match a class of boards, not a specific device configuration. */
667int check_legacy_ioport(unsigned long base_port)
668{
669 struct device_node *parent, *np = NULL;
670 int ret = -ENODEV;
671
672 switch(base_port) {
673 case I8042_DATA_REG:
674 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
675 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
676 if (np) {
677 parent = of_get_parent(np);
678
679 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
680 if (!of_i8042_kbd_irq)
681 of_i8042_kbd_irq = 1;
682
683 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
684 if (!of_i8042_aux_irq)
685 of_i8042_aux_irq = 12;
686
687 of_node_put(np);
688 np = parent;
689 break;
690 }
691 np = of_find_node_by_type(NULL, "8042");
692 /* Pegasos has no device_type on its 8042 node, look for the
693 * name instead */
694 if (!np)
695 np = of_find_node_by_name(NULL, "8042");
696 if (np) {
697 of_i8042_kbd_irq = 1;
698 of_i8042_aux_irq = 12;
699 }
700 break;
701 case FDC_BASE: /* FDC1 */
702 np = of_find_node_by_type(NULL, "fdc");
703 break;
704 default:
705 /* ipmi is supposed to fail here */
706 break;
707 }
708 if (!np)
709 return ret;
710 parent = of_get_parent(np);
711 if (parent) {
712 if (of_node_is_type(parent, "isa"))
713 ret = 0;
714 of_node_put(parent);
715 }
716 of_node_put(np);
717 return ret;
718}
719EXPORT_SYMBOL(check_legacy_ioport);
720
721/*
722 * Panic notifiers setup
723 *
724 * We have 3 notifiers for powerpc, each one from a different "nature":
725 *
726 * - ppc_panic_fadump_handler() is a hypervisor notifier, which hard-disables
727 * IRQs and deal with the Firmware-Assisted dump, when it is configured;
728 * should run early in the panic path.
729 *
730 * - dump_kernel_offset() is an informative notifier, just showing the KASLR
731 * offset if we have RANDOMIZE_BASE set.
732 *
733 * - ppc_panic_platform_handler() is a low-level handler that's registered
734 * only if the platform wishes to perform final actions in the panic path,
735 * hence it should run late and might not even return. Currently, only
736 * pseries and ps3 platforms register callbacks.
737 */
738static int ppc_panic_fadump_handler(struct notifier_block *this,
739 unsigned long event, void *ptr)
740{
741 /*
742 * panic does a local_irq_disable, but we really
743 * want interrupts to be hard disabled.
744 */
745 hard_irq_disable();
746
747 /*
748 * If firmware-assisted dump has been registered then trigger
749 * its callback and let the firmware handles everything else.
750 */
751 crash_fadump(NULL, ptr);
752
753 return NOTIFY_DONE;
754}
755
756static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
757 void *p)
758{
759 pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
760 kaslr_offset(), KERNELBASE);
761
762 return NOTIFY_DONE;
763}
764
765static int ppc_panic_platform_handler(struct notifier_block *this,
766 unsigned long event, void *ptr)
767{
768 /*
769 * This handler is only registered if we have a panic callback
770 * on ppc_md, hence NULL check is not needed.
771 * Also, it may not return, so it runs really late on panic path.
772 */
773 ppc_md.panic(ptr);
774
775 return NOTIFY_DONE;
776}
777
778static struct notifier_block ppc_fadump_block = {
779 .notifier_call = ppc_panic_fadump_handler,
780 .priority = INT_MAX, /* run early, to notify the firmware ASAP */
781};
782
783static struct notifier_block kernel_offset_notifier = {
784 .notifier_call = dump_kernel_offset,
785};
786
787static struct notifier_block ppc_panic_block = {
788 .notifier_call = ppc_panic_platform_handler,
789 .priority = INT_MIN, /* may not return; must be done last */
790};
791
792void __init setup_panic(void)
793{
794 /* Hard-disables IRQs + deal with FW-assisted dump (fadump) */
795 atomic_notifier_chain_register(&panic_notifier_list,
796 &ppc_fadump_block);
797
798 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0)
799 atomic_notifier_chain_register(&panic_notifier_list,
800 &kernel_offset_notifier);
801
802 /* Low-level platform-specific routines that should run on panic */
803 if (ppc_md.panic)
804 atomic_notifier_chain_register(&panic_notifier_list,
805 &ppc_panic_block);
806}
807
808#ifdef CONFIG_CHECK_CACHE_COHERENCY
809/*
810 * For platforms that have configurable cache-coherency. This function
811 * checks that the cache coherency setting of the kernel matches the setting
812 * left by the firmware, as indicated in the device tree. Since a mismatch
813 * will eventually result in DMA failures, we print * and error and call
814 * BUG() in that case.
815 */
816
817#define KERNEL_COHERENCY (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
818
819static int __init check_cache_coherency(void)
820{
821 struct device_node *np;
822 const void *prop;
823 bool devtree_coherency;
824
825 np = of_find_node_by_path("/");
826 prop = of_get_property(np, "coherency-off", NULL);
827 of_node_put(np);
828
829 devtree_coherency = prop ? false : true;
830
831 if (devtree_coherency != KERNEL_COHERENCY) {
832 printk(KERN_ERR
833 "kernel coherency:%s != device tree_coherency:%s\n",
834 KERNEL_COHERENCY ? "on" : "off",
835 devtree_coherency ? "on" : "off");
836 BUG();
837 }
838
839 return 0;
840}
841
842late_initcall(check_cache_coherency);
843#endif /* CONFIG_CHECK_CACHE_COHERENCY */
844
845void ppc_printk_progress(char *s, unsigned short hex)
846{
847 pr_info("%s\n", s);
848}
849
850static __init void print_system_info(void)
851{
852 pr_info("-----------------------------------------------------\n");
853 pr_info("phys_mem_size = 0x%llx\n",
854 (unsigned long long)memblock_phys_mem_size());
855
856 pr_info("dcache_bsize = 0x%x\n", dcache_bsize);
857 pr_info("icache_bsize = 0x%x\n", icache_bsize);
858
859 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features);
860 pr_info(" possible = 0x%016lx\n",
861 (unsigned long)CPU_FTRS_POSSIBLE);
862 pr_info(" always = 0x%016lx\n",
863 (unsigned long)CPU_FTRS_ALWAYS);
864 pr_info("cpu_user_features = 0x%08x 0x%08x\n",
865 cur_cpu_spec->cpu_user_features,
866 cur_cpu_spec->cpu_user_features2);
867 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features);
868#ifdef CONFIG_PPC64
869 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
870#ifdef CONFIG_PPC_BOOK3S
871 pr_info("vmalloc start = 0x%lx\n", KERN_VIRT_START);
872 pr_info("IO start = 0x%lx\n", KERN_IO_START);
873 pr_info("vmemmap start = 0x%lx\n", (unsigned long)vmemmap);
874#endif
875#endif
876
877 if (!early_radix_enabled())
878 print_system_hash_info();
879
880 if (PHYSICAL_START > 0)
881 pr_info("physical_start = 0x%llx\n",
882 (unsigned long long)PHYSICAL_START);
883 pr_info("-----------------------------------------------------\n");
884}
885
886#ifdef CONFIG_SMP
887static void __init smp_setup_pacas(void)
888{
889 int cpu;
890
891 for_each_possible_cpu(cpu) {
892 if (cpu == smp_processor_id())
893 continue;
894 allocate_paca(cpu);
895 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
896 }
897
898 memblock_free(cpu_to_phys_id, nr_cpu_ids * sizeof(u32));
899 cpu_to_phys_id = NULL;
900}
901#endif
902
903/*
904 * Called into from start_kernel this initializes memblock, which is used
905 * to manage page allocation until mem_init is called.
906 */
907void __init setup_arch(char **cmdline_p)
908{
909 kasan_init();
910
911 *cmdline_p = boot_command_line;
912
913 /* Set a half-reasonable default so udelay does something sensible */
914 loops_per_jiffy = 500000000 / HZ;
915
916 /* Unflatten the device-tree passed by prom_init or kexec */
917 unflatten_device_tree();
918
919 /*
920 * Initialize cache line/block info from device-tree (on ppc64) or
921 * just cputable (on ppc32).
922 */
923 initialize_cache_info();
924
925 /* Initialize RTAS if available. */
926 rtas_initialize();
927
928 /* Check if we have an initrd provided via the device-tree. */
929 check_for_initrd();
930
931 /* Probe the machine type, establish ppc_md. */
932 probe_machine();
933
934 /* Setup panic notifier if requested by the platform. */
935 setup_panic();
936
937 /*
938 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
939 * it from their respective probe() function.
940 */
941 setup_power_save();
942
943 /* Discover standard serial ports. */
944 find_legacy_serial_ports();
945
946 /* Register early console with the printk subsystem. */
947 register_early_udbg_console();
948
949 /* Setup the various CPU maps based on the device-tree. */
950 smp_setup_cpu_maps();
951
952 /* Initialize xmon. */
953 xmon_setup();
954
955 /* Check the SMT related command line arguments (ppc64). */
956 check_smt_enabled();
957
958 /* Parse memory topology */
959 mem_topology_setup();
960 /* Set max_mapnr before paging_init() */
961 set_max_mapnr(max_pfn);
962
963 /*
964 * Release secondary cpus out of their spinloops at 0x60 now that
965 * we can map physical -> logical CPU ids.
966 *
967 * Freescale Book3e parts spin in a loop provided by firmware,
968 * so smp_release_cpus() does nothing for them.
969 */
970#ifdef CONFIG_SMP
971 smp_setup_pacas();
972
973 /* On BookE, setup per-core TLB data structures. */
974 setup_tlb_core_data();
975#endif
976
977 /* Print various info about the machine that has been gathered so far. */
978 print_system_info();
979
980 klp_init_thread_info(&init_task);
981
982 setup_initial_init_mm(_stext, _etext, _edata, _end);
983 /* sched_init() does the mmgrab(&init_mm) for the primary CPU */
984 VM_WARN_ON(cpumask_test_cpu(smp_processor_id(), mm_cpumask(&init_mm)));
985 cpumask_set_cpu(smp_processor_id(), mm_cpumask(&init_mm));
986 inc_mm_active_cpus(&init_mm);
987 mm_iommu_init(&init_mm);
988
989 irqstack_early_init();
990 exc_lvl_early_init();
991 emergency_stack_init();
992
993 mce_init();
994 smp_release_cpus();
995
996 initmem_init();
997
998 /*
999 * Reserve large chunks of memory for use by CMA for KVM and hugetlb. These must
1000 * be called after initmem_init(), so that pageblock_order is initialised.
1001 */
1002 kvm_cma_reserve();
1003 gigantic_hugetlb_cma_reserve();
1004
1005 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
1006
1007 if (ppc_md.setup_arch)
1008 ppc_md.setup_arch();
1009
1010 setup_barrier_nospec();
1011 setup_spectre_v2();
1012
1013 paging_init();
1014
1015 /* Initialize the MMU context management stuff. */
1016 mmu_context_init();
1017
1018 /* Interrupt code needs to be 64K-aligned. */
1019 if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff)
1020 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
1021 (unsigned long)_stext);
1022}