]> Git Repo - J-linux.git/blob - arch/powerpc/kernel/setup-common.c
Merge tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
[J-linux.git] / arch / powerpc / kernel / setup-common.c
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 #include <asm/systemcfg.h>
71
72 #include "setup.h"
73
74 #ifdef DEBUG
75 #define DBG(fmt...) udbg_printf(fmt)
76 #else
77 #define DBG(fmt...)
78 #endif
79
80 /* The main machine-dep calls structure
81  */
82 struct machdep_calls ppc_md;
83 EXPORT_SYMBOL(ppc_md);
84 struct machdep_calls *machine_id;
85 EXPORT_SYMBOL(machine_id);
86
87 int boot_cpuid = -1;
88 EXPORT_SYMBOL_GPL(boot_cpuid);
89 int __initdata boot_core_hwid = -1;
90
91 #ifdef CONFIG_PPC64
92 int boot_cpu_hwid = -1;
93 #endif
94
95 /*
96  * These are used in binfmt_elf.c to put aux entries on the stack
97  * for each elf executable being started.
98  */
99 int dcache_bsize;
100 int icache_bsize;
101
102 /* Variables required to store legacy IO irq routing */
103 int of_i8042_kbd_irq;
104 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
105 int of_i8042_aux_irq;
106 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
107
108 #ifdef __DO_IRQ_CANON
109 /* XXX should go elsewhere eventually */
110 int ppc_do_canonicalize_irqs;
111 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
112 #endif
113
114 #ifdef CONFIG_CRASH_DUMP
115 /* This keeps a track of which one is the crashing cpu. */
116 int crashing_cpu = -1;
117 #endif
118
119 /* also used by kexec */
120 void machine_shutdown(void)
121 {
122         /*
123          * if fadump is active, cleanup the fadump registration before we
124          * shutdown.
125          */
126         fadump_cleanup();
127
128         if (ppc_md.machine_shutdown)
129                 ppc_md.machine_shutdown();
130 }
131
132 static void machine_hang(void)
133 {
134         pr_emerg("System Halted, OK to turn off power\n");
135         local_irq_disable();
136         while (1)
137                 ;
138 }
139
140 void machine_restart(char *cmd)
141 {
142         machine_shutdown();
143         if (ppc_md.restart)
144                 ppc_md.restart(cmd);
145
146         smp_send_stop();
147
148         do_kernel_restart(cmd);
149         mdelay(1000);
150
151         machine_hang();
152 }
153
154 void machine_power_off(void)
155 {
156         machine_shutdown();
157         do_kernel_power_off();
158         smp_send_stop();
159         machine_hang();
160 }
161 /* Used by the G5 thermal driver */
162 EXPORT_SYMBOL_GPL(machine_power_off);
163
164 void (*pm_power_off)(void);
165 EXPORT_SYMBOL_GPL(pm_power_off);
166
167 size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs)
168 {
169         if (max_longs && ppc_md.get_random_seed && ppc_md.get_random_seed(v))
170                 return 1;
171         return 0;
172 }
173 EXPORT_SYMBOL(arch_get_random_seed_longs);
174
175 void machine_halt(void)
176 {
177         machine_shutdown();
178         if (ppc_md.halt)
179                 ppc_md.halt();
180
181         smp_send_stop();
182         machine_hang();
183 }
184
185 #ifdef CONFIG_SMP
186 DEFINE_PER_CPU(unsigned int, cpu_pvr);
187 #endif
188
189 static void show_cpuinfo_summary(struct seq_file *m)
190 {
191         struct device_node *root;
192         const char *model = NULL;
193         unsigned long bogosum = 0;
194         int i;
195
196         if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) {
197                 for_each_online_cpu(i)
198                         bogosum += loops_per_jiffy;
199                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
200                            bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100);
201         }
202         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
203         if (ppc_md.name)
204                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
205         root = of_find_node_by_path("/");
206         if (root)
207                 model = of_get_property(root, "model", NULL);
208         if (model)
209                 seq_printf(m, "model\t\t: %s\n", model);
210         of_node_put(root);
211
212         if (ppc_md.show_cpuinfo != NULL)
213                 ppc_md.show_cpuinfo(m);
214
215         /* Display the amount of memory */
216         if (IS_ENABLED(CONFIG_PPC32))
217                 seq_printf(m, "Memory\t\t: %d MB\n",
218                            (unsigned int)(total_memory / (1024 * 1024)));
219 }
220
221 static int show_cpuinfo(struct seq_file *m, void *v)
222 {
223         unsigned long cpu_id = (unsigned long)v - 1;
224         unsigned int pvr;
225         unsigned long proc_freq;
226         unsigned short maj;
227         unsigned short min;
228
229 #ifdef CONFIG_SMP
230         pvr = per_cpu(cpu_pvr, cpu_id);
231 #else
232         pvr = mfspr(SPRN_PVR);
233 #endif
234         maj = (pvr >> 8) & 0xFF;
235         min = pvr & 0xFF;
236
237         seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id);
238
239         if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
240                 seq_puts(m, cur_cpu_spec->cpu_name);
241         else
242                 seq_printf(m, "unknown (%08x)", pvr);
243
244         if (cpu_has_feature(CPU_FTR_ALTIVEC))
245                 seq_puts(m, ", altivec supported");
246
247         seq_putc(m, '\n');
248
249 #ifdef CONFIG_TAU
250         if (cpu_has_feature(CPU_FTR_TAU)) {
251                 if (IS_ENABLED(CONFIG_TAU_AVERAGE)) {
252                         /* more straightforward, but potentially misleading */
253                         seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
254                                    cpu_temp(cpu_id));
255                 } else {
256                         /* show the actual temp sensor range */
257                         u32 temp;
258                         temp = cpu_temp_both(cpu_id);
259                         seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
260                                    temp & 0xff, temp >> 16);
261                 }
262         }
263 #endif /* CONFIG_TAU */
264
265         /*
266          * Platforms that have variable clock rates, should implement
267          * the method ppc_md.get_proc_freq() that reports the clock
268          * rate of a given cpu. The rest can use ppc_proc_freq to
269          * report the clock rate that is same across all cpus.
270          */
271         if (ppc_md.get_proc_freq)
272                 proc_freq = ppc_md.get_proc_freq(cpu_id);
273         else
274                 proc_freq = ppc_proc_freq;
275
276         if (proc_freq)
277                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
278                            proc_freq / 1000000, proc_freq % 1000000);
279
280         /* If we are a Freescale core do a simple check so
281          * we don't have to keep adding cases in the future */
282         if (PVR_VER(pvr) & 0x8000) {
283                 switch (PVR_VER(pvr)) {
284                 case 0x8000:    /* 7441/7450/7451, Voyager */
285                 case 0x8001:    /* 7445/7455, Apollo 6 */
286                 case 0x8002:    /* 7447/7457, Apollo 7 */
287                 case 0x8003:    /* 7447A, Apollo 7 PM */
288                 case 0x8004:    /* 7448, Apollo 8 */
289                 case 0x800c:    /* 7410, Nitro */
290                         maj = ((pvr >> 8) & 0xF);
291                         min = PVR_MIN(pvr);
292                         break;
293                 default:        /* e500/book-e */
294                         maj = PVR_MAJ(pvr);
295                         min = PVR_MIN(pvr);
296                         break;
297                 }
298         } else {
299                 switch (PVR_VER(pvr)) {
300                         case 0x1008:    /* 740P/750P ?? */
301                                 maj = ((pvr >> 8) & 0xFF) - 1;
302                                 min = pvr & 0xFF;
303                                 break;
304                         case 0x004e: /* POWER9 bits 12-15 give chip type */
305                         case 0x0080: /* POWER10 bit 12 gives SMT8/4 */
306                                 maj = (pvr >> 8) & 0x0F;
307                                 min = pvr & 0xFF;
308                                 break;
309                         default:
310                                 maj = (pvr >> 8) & 0xFF;
311                                 min = pvr & 0xFF;
312                                 break;
313                 }
314         }
315
316         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
317                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
318
319         if (IS_ENABLED(CONFIG_PPC32))
320                 seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ),
321                            (loops_per_jiffy / (5000 / HZ)) % 100);
322
323         seq_putc(m, '\n');
324
325         /* If this is the last cpu, print the summary */
326         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
327                 show_cpuinfo_summary(m);
328
329         return 0;
330 }
331
332 static void *c_start(struct seq_file *m, loff_t *pos)
333 {
334         if (*pos == 0)  /* just in case, cpu 0 is not the first */
335                 *pos = cpumask_first(cpu_online_mask);
336         else
337                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
338         if ((*pos) < nr_cpu_ids)
339                 return (void *)(unsigned long)(*pos + 1);
340         return NULL;
341 }
342
343 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
344 {
345         (*pos)++;
346         return c_start(m, pos);
347 }
348
349 static void c_stop(struct seq_file *m, void *v)
350 {
351 }
352
353 const struct seq_operations cpuinfo_op = {
354         .start  = c_start,
355         .next   = c_next,
356         .stop   = c_stop,
357         .show   = show_cpuinfo,
358 };
359
360 void __init check_for_initrd(void)
361 {
362 #ifdef CONFIG_BLK_DEV_INITRD
363         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
364             initrd_start, initrd_end);
365
366         /* If we were passed an initrd, set the ROOT_DEV properly if the values
367          * look sensible. If not, clear initrd reference.
368          */
369         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
370             initrd_end > initrd_start)
371                 ROOT_DEV = Root_RAM0;
372         else
373                 initrd_start = initrd_end = 0;
374
375         if (initrd_start)
376                 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
377
378         DBG(" <- check_for_initrd()\n");
379 #endif /* CONFIG_BLK_DEV_INITRD */
380 }
381
382 #ifdef CONFIG_SMP
383
384 int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
385 cpumask_t threads_core_mask __read_mostly;
386 EXPORT_SYMBOL_GPL(threads_per_core);
387 EXPORT_SYMBOL_GPL(threads_per_subcore);
388 EXPORT_SYMBOL_GPL(threads_shift);
389 EXPORT_SYMBOL_GPL(threads_core_mask);
390
391 static void __init cpu_init_thread_core_maps(int tpc)
392 {
393         int i;
394
395         threads_per_core = tpc;
396         threads_per_subcore = tpc;
397         cpumask_clear(&threads_core_mask);
398
399         /* This implementation only supports power of 2 number of threads
400          * for simplicity and performance
401          */
402         threads_shift = ilog2(tpc);
403         BUG_ON(tpc != (1 << threads_shift));
404
405         for (i = 0; i < tpc; i++)
406                 cpumask_set_cpu(i, &threads_core_mask);
407
408         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
409                tpc, str_plural(tpc));
410         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
411 }
412
413
414 u32 *cpu_to_phys_id = NULL;
415
416 static int assign_threads(unsigned int cpu, unsigned int nthreads, bool present,
417                           const __be32 *hw_ids)
418 {
419         for (int i = 0; i < nthreads && cpu < nr_cpu_ids; i++) {
420                 __be32 hwid;
421
422                 hwid = be32_to_cpu(hw_ids[i]);
423
424                 DBG("    thread %d -> cpu %d (hard id %d)\n", i, cpu, hwid);
425
426                 set_cpu_present(cpu, present);
427                 set_cpu_possible(cpu, true);
428                 cpu_to_phys_id[cpu] = hwid;
429                 cpu++;
430         }
431
432         return cpu;
433 }
434
435 /**
436  * setup_cpu_maps - initialize the following cpu maps:
437  *                  cpu_possible_mask
438  *                  cpu_present_mask
439  *
440  * Having the possible map set up early allows us to restrict allocations
441  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
442  *
443  * We do not initialize the online map here; cpus set their own bits in
444  * cpu_online_mask as they come up.
445  *
446  * This function is valid only for Open Firmware systems.  finish_device_tree
447  * must be called before using this.
448  *
449  * While we're here, we may as well set the "physical" cpu ids in the paca.
450  *
451  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
452  */
453 void __init smp_setup_cpu_maps(void)
454 {
455         struct device_node *dn;
456         int cpu = 0;
457         int nthreads = 1;
458
459         DBG("smp_setup_cpu_maps()\n");
460
461         cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32),
462                                         __alignof__(u32));
463         if (!cpu_to_phys_id)
464                 panic("%s: Failed to allocate %zu bytes align=0x%zx\n",
465                       __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32));
466
467         for_each_node_by_type(dn, "cpu") {
468                 const __be32 *intserv;
469                 __be32 cpu_be;
470                 int len;
471
472                 DBG("  * %pOF...\n", dn);
473
474                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
475                                 &len);
476                 if (intserv) {
477                         DBG("    ibm,ppc-interrupt-server#s -> %lu threads\n",
478                             (len / sizeof(int)));
479                 } else {
480                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
481                         intserv = of_get_property(dn, "reg", &len);
482                         if (!intserv) {
483                                 cpu_be = cpu_to_be32(cpu);
484                                 /* XXX: what is this? uninitialized?? */
485                                 intserv = &cpu_be;      /* assume logical == phys */
486                                 len = 4;
487                         }
488                 }
489
490                 nthreads = len / sizeof(int);
491
492                 bool avail = of_device_is_available(dn);
493                 if (!avail)
494                         avail = !of_property_match_string(dn,
495                                         "enable-method", "spin-table");
496
497                 if (boot_core_hwid >= 0) {
498                         if (cpu == 0) {
499                                 pr_info("Skipping CPU node %pOF to allow for boot core.\n", dn);
500                                 cpu = nthreads;
501                                 continue;
502                         }
503
504                         if (be32_to_cpu(intserv[0]) == boot_core_hwid) {
505                                 pr_info("Renumbered boot core %pOF to logical 0\n", dn);
506                                 assign_threads(0, nthreads, avail, intserv);
507                                 of_node_put(dn);
508                                 break;
509                         }
510                 } else if (cpu >= nr_cpu_ids) {
511                         of_node_put(dn);
512                         break;
513                 }
514
515                 if (cpu < nr_cpu_ids)
516                         cpu = assign_threads(cpu, nthreads, avail, intserv);
517         }
518
519         /* If no SMT supported, nthreads is forced to 1 */
520         if (!cpu_has_feature(CPU_FTR_SMT)) {
521                 DBG("  SMT disabled ! nthreads forced to 1\n");
522                 nthreads = 1;
523         }
524
525 #ifdef CONFIG_PPC64
526         /*
527          * On pSeries LPAR, we need to know how many cpus
528          * could possibly be added to this partition.
529          */
530         if (firmware_has_feature(FW_FEATURE_LPAR) &&
531             (dn = of_find_node_by_path("/rtas"))) {
532                 int num_addr_cell, num_size_cell, maxcpus;
533                 const __be32 *ireg;
534
535                 num_addr_cell = of_n_addr_cells(dn);
536                 num_size_cell = of_n_size_cells(dn);
537
538                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
539
540                 if (!ireg)
541                         goto out;
542
543                 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
544
545                 /* Double maxcpus for processors which have SMT capability */
546                 if (cpu_has_feature(CPU_FTR_SMT))
547                         maxcpus *= nthreads;
548
549                 if (maxcpus > nr_cpu_ids) {
550                         printk(KERN_WARNING
551                                "Partition configured for %d cpus, "
552                                "operating system maximum is %u.\n",
553                                maxcpus, nr_cpu_ids);
554                         maxcpus = nr_cpu_ids;
555                 } else
556                         printk(KERN_INFO "Partition configured for %d cpus.\n",
557                                maxcpus);
558
559                 for (cpu = 0; cpu < maxcpus; cpu++)
560                         set_cpu_possible(cpu, true);
561         out:
562                 of_node_put(dn);
563         }
564 #endif
565 #ifdef CONFIG_PPC64_PROC_SYSTEMCFG
566         systemcfg->processorCount = num_present_cpus();
567 #endif /* CONFIG_PPC64 */
568
569         /* Initialize CPU <=> thread mapping/
570          *
571          * WARNING: We assume that the number of threads is the same for
572          * every CPU in the system. If that is not the case, then some code
573          * here will have to be reworked
574          */
575         cpu_init_thread_core_maps(nthreads);
576
577         /* Now that possible cpus are set, set nr_cpu_ids for later use */
578         setup_nr_cpu_ids();
579
580         free_unused_pacas();
581 }
582 #endif /* CONFIG_SMP */
583
584 #ifdef CONFIG_PCSPKR_PLATFORM
585 static __init int add_pcspkr(void)
586 {
587         struct device_node *np;
588         struct platform_device *pd;
589         int ret;
590
591         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
592         of_node_put(np);
593         if (!np)
594                 return -ENODEV;
595
596         pd = platform_device_alloc("pcspkr", -1);
597         if (!pd)
598                 return -ENOMEM;
599
600         ret = platform_device_add(pd);
601         if (ret)
602                 platform_device_put(pd);
603
604         return ret;
605 }
606 device_initcall(add_pcspkr);
607 #endif  /* CONFIG_PCSPKR_PLATFORM */
608
609 static char ppc_hw_desc_buf[128] __initdata;
610
611 struct seq_buf ppc_hw_desc __initdata = {
612         .buffer = ppc_hw_desc_buf,
613         .size = sizeof(ppc_hw_desc_buf),
614         .len = 0,
615 };
616
617 static __init void probe_machine(void)
618 {
619         extern struct machdep_calls __machine_desc_start;
620         extern struct machdep_calls __machine_desc_end;
621         unsigned int i;
622
623         /*
624          * Iterate all ppc_md structures until we find the proper
625          * one for the current machine type
626          */
627         DBG("Probing machine type ...\n");
628
629         /*
630          * Check ppc_md is empty, if not we have a bug, ie, we setup an
631          * entry before probe_machine() which will be overwritten
632          */
633         for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
634                 if (((void **)&ppc_md)[i]) {
635                         printk(KERN_ERR "Entry %d in ppc_md non empty before"
636                                " machine probe !\n", i);
637                 }
638         }
639
640         for (machine_id = &__machine_desc_start;
641              machine_id < &__machine_desc_end;
642              machine_id++) {
643                 DBG("  %s ...\n", machine_id->name);
644                 if (machine_id->compatible && !of_machine_is_compatible(machine_id->compatible))
645                         continue;
646                 if (machine_id->compatibles && !of_machine_compatible_match(machine_id->compatibles))
647                         continue;
648                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
649                 if (ppc_md.probe && !ppc_md.probe())
650                         continue;
651                 DBG("   %s match !\n", machine_id->name);
652                 break;
653         }
654         /* What can we do if we didn't find ? */
655         if (machine_id >= &__machine_desc_end) {
656                 pr_err("No suitable machine description found !\n");
657                 for (;;);
658         }
659
660         // Append the machine name to other info we've gathered
661         seq_buf_puts(&ppc_hw_desc, ppc_md.name);
662
663         // Set the generic hardware description shown in oopses
664         dump_stack_set_arch_desc(ppc_hw_desc.buffer);
665
666         pr_info("Hardware name: %s\n", ppc_hw_desc.buffer);
667 }
668
669 /* Match a class of boards, not a specific device configuration. */
670 int check_legacy_ioport(unsigned long base_port)
671 {
672         struct device_node *parent, *np = NULL;
673         int ret = -ENODEV;
674
675         switch(base_port) {
676         case I8042_DATA_REG:
677                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
678                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
679                 if (np) {
680                         parent = of_get_parent(np);
681
682                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
683                         if (!of_i8042_kbd_irq)
684                                 of_i8042_kbd_irq = 1;
685
686                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
687                         if (!of_i8042_aux_irq)
688                                 of_i8042_aux_irq = 12;
689
690                         of_node_put(np);
691                         np = parent;
692                         break;
693                 }
694                 np = of_find_node_by_type(NULL, "8042");
695                 /* Pegasos has no device_type on its 8042 node, look for the
696                  * name instead */
697                 if (!np)
698                         np = of_find_node_by_name(NULL, "8042");
699                 if (np) {
700                         of_i8042_kbd_irq = 1;
701                         of_i8042_aux_irq = 12;
702                 }
703                 break;
704         case FDC_BASE: /* FDC1 */
705                 np = of_find_node_by_type(NULL, "fdc");
706                 break;
707         default:
708                 /* ipmi is supposed to fail here */
709                 break;
710         }
711         if (!np)
712                 return ret;
713         parent = of_get_parent(np);
714         if (parent) {
715                 if (of_node_is_type(parent, "isa"))
716                         ret = 0;
717                 of_node_put(parent);
718         }
719         of_node_put(np);
720         return ret;
721 }
722 EXPORT_SYMBOL(check_legacy_ioport);
723
724 /*
725  * Panic notifiers setup
726  *
727  * We have 3 notifiers for powerpc, each one from a different "nature":
728  *
729  * - ppc_panic_fadump_handler() is a hypervisor notifier, which hard-disables
730  *   IRQs and deal with the Firmware-Assisted dump, when it is configured;
731  *   should run early in the panic path.
732  *
733  * - dump_kernel_offset() is an informative notifier, just showing the KASLR
734  *   offset if we have RANDOMIZE_BASE set.
735  *
736  * - ppc_panic_platform_handler() is a low-level handler that's registered
737  *   only if the platform wishes to perform final actions in the panic path,
738  *   hence it should run late and might not even return. Currently, only
739  *   pseries and ps3 platforms register callbacks.
740  */
741 static int ppc_panic_fadump_handler(struct notifier_block *this,
742                                     unsigned long event, void *ptr)
743 {
744         /*
745          * panic does a local_irq_disable, but we really
746          * want interrupts to be hard disabled.
747          */
748         hard_irq_disable();
749
750         /*
751          * If firmware-assisted dump has been registered then trigger
752          * its callback and let the firmware handles everything else.
753          */
754         crash_fadump(NULL, ptr);
755
756         return NOTIFY_DONE;
757 }
758
759 static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
760                               void *p)
761 {
762         pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
763                  kaslr_offset(), KERNELBASE);
764
765         return NOTIFY_DONE;
766 }
767
768 static int ppc_panic_platform_handler(struct notifier_block *this,
769                                       unsigned long event, void *ptr)
770 {
771         /*
772          * This handler is only registered if we have a panic callback
773          * on ppc_md, hence NULL check is not needed.
774          * Also, it may not return, so it runs really late on panic path.
775          */
776         ppc_md.panic(ptr);
777
778         return NOTIFY_DONE;
779 }
780
781 static struct notifier_block ppc_fadump_block = {
782         .notifier_call = ppc_panic_fadump_handler,
783         .priority = INT_MAX, /* run early, to notify the firmware ASAP */
784 };
785
786 static struct notifier_block kernel_offset_notifier = {
787         .notifier_call = dump_kernel_offset,
788 };
789
790 static struct notifier_block ppc_panic_block = {
791         .notifier_call = ppc_panic_platform_handler,
792         .priority = INT_MIN, /* may not return; must be done last */
793 };
794
795 void __init setup_panic(void)
796 {
797         /* Hard-disables IRQs + deal with FW-assisted dump (fadump) */
798         atomic_notifier_chain_register(&panic_notifier_list,
799                                        &ppc_fadump_block);
800
801         if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0)
802                 atomic_notifier_chain_register(&panic_notifier_list,
803                                                &kernel_offset_notifier);
804
805         /* Low-level platform-specific routines that should run on panic */
806         if (ppc_md.panic)
807                 atomic_notifier_chain_register(&panic_notifier_list,
808                                                &ppc_panic_block);
809 }
810
811 #ifdef CONFIG_CHECK_CACHE_COHERENCY
812 /*
813  * For platforms that have configurable cache-coherency.  This function
814  * checks that the cache coherency setting of the kernel matches the setting
815  * left by the firmware, as indicated in the device tree.  Since a mismatch
816  * will eventually result in DMA failures, we print * and error and call
817  * BUG() in that case.
818  */
819
820 #define KERNEL_COHERENCY        (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
821
822 static int __init check_cache_coherency(void)
823 {
824         struct device_node *np;
825         const void *prop;
826         bool devtree_coherency;
827
828         np = of_find_node_by_path("/");
829         prop = of_get_property(np, "coherency-off", NULL);
830         of_node_put(np);
831
832         devtree_coherency = prop ? false : true;
833
834         if (devtree_coherency != KERNEL_COHERENCY) {
835                 printk(KERN_ERR
836                         "kernel coherency:%s != device tree_coherency:%s\n",
837                         KERNEL_COHERENCY ? "on" : "off",
838                         devtree_coherency ? "on" : "off");
839                 BUG();
840         }
841
842         return 0;
843 }
844
845 late_initcall(check_cache_coherency);
846 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
847
848 void ppc_printk_progress(char *s, unsigned short hex)
849 {
850         pr_info("%s\n", s);
851 }
852
853 static __init void print_system_info(void)
854 {
855         pr_info("-----------------------------------------------------\n");
856         pr_info("phys_mem_size     = 0x%llx\n",
857                 (unsigned long long)memblock_phys_mem_size());
858
859         pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
860         pr_info("icache_bsize      = 0x%x\n", icache_bsize);
861
862         pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
863         pr_info("  possible        = 0x%016lx\n",
864                 (unsigned long)CPU_FTRS_POSSIBLE);
865         pr_info("  always          = 0x%016lx\n",
866                 (unsigned long)CPU_FTRS_ALWAYS);
867         pr_info("cpu_user_features = 0x%08x 0x%08x\n",
868                 cur_cpu_spec->cpu_user_features,
869                 cur_cpu_spec->cpu_user_features2);
870         pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
871 #ifdef CONFIG_PPC64
872         pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
873 #ifdef CONFIG_PPC_BOOK3S
874         pr_info("vmalloc start     = 0x%lx\n", KERN_VIRT_START);
875         pr_info("IO start          = 0x%lx\n", KERN_IO_START);
876         pr_info("vmemmap start     = 0x%lx\n", (unsigned long)vmemmap);
877 #endif
878 #endif
879
880         if (!early_radix_enabled())
881                 print_system_hash_info();
882
883         if (PHYSICAL_START > 0)
884                 pr_info("physical_start    = 0x%llx\n",
885                        (unsigned long long)PHYSICAL_START);
886         pr_info("-----------------------------------------------------\n");
887 }
888
889 #ifdef CONFIG_SMP
890 static void __init smp_setup_pacas(void)
891 {
892         int cpu;
893
894         for_each_possible_cpu(cpu) {
895                 if (cpu == smp_processor_id())
896                         continue;
897                 allocate_paca(cpu);
898                 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
899         }
900
901         memblock_free(cpu_to_phys_id, nr_cpu_ids * sizeof(u32));
902         cpu_to_phys_id = NULL;
903 }
904 #endif
905
906 /*
907  * Called into from start_kernel this initializes memblock, which is used
908  * to manage page allocation until mem_init is called.
909  */
910 void __init setup_arch(char **cmdline_p)
911 {
912         kasan_init();
913
914         *cmdline_p = boot_command_line;
915
916         /* Set a half-reasonable default so udelay does something sensible */
917         loops_per_jiffy = 500000000 / HZ;
918
919         /* Unflatten the device-tree passed by prom_init or kexec */
920         unflatten_device_tree();
921
922         /*
923          * Initialize cache line/block info from device-tree (on ppc64) or
924          * just cputable (on ppc32).
925          */
926         initialize_cache_info();
927
928         /* Initialize RTAS if available. */
929         rtas_initialize();
930
931         /* Check if we have an initrd provided via the device-tree. */
932         check_for_initrd();
933
934         /* Probe the machine type, establish ppc_md. */
935         probe_machine();
936
937         /* Setup panic notifier if requested by the platform. */
938         setup_panic();
939
940         /*
941          * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
942          * it from their respective probe() function.
943          */
944         setup_power_save();
945
946         /* Discover standard serial ports. */
947         find_legacy_serial_ports();
948
949         /* Register early console with the printk subsystem. */
950         register_early_udbg_console();
951
952         /* Setup the various CPU maps based on the device-tree. */
953         smp_setup_cpu_maps();
954
955         /* Initialize xmon. */
956         xmon_setup();
957
958         /* Check the SMT related command line arguments (ppc64). */
959         check_smt_enabled();
960
961         /* Parse memory topology */
962         mem_topology_setup();
963         /* Set max_mapnr before paging_init() */
964         set_max_mapnr(max_pfn);
965         high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
966
967         /*
968          * Release secondary cpus out of their spinloops at 0x60 now that
969          * we can map physical -> logical CPU ids.
970          *
971          * Freescale Book3e parts spin in a loop provided by firmware,
972          * so smp_release_cpus() does nothing for them.
973          */
974 #ifdef CONFIG_SMP
975         smp_setup_pacas();
976
977         /* On BookE, setup per-core TLB data structures. */
978         setup_tlb_core_data();
979 #endif
980
981         /* Print various info about the machine that has been gathered so far. */
982         print_system_info();
983
984         klp_init_thread_info(&init_task);
985
986         setup_initial_init_mm(_stext, _etext, _edata, _end);
987         /* sched_init() does the mmgrab(&init_mm) for the primary CPU */
988         VM_WARN_ON(cpumask_test_cpu(smp_processor_id(), mm_cpumask(&init_mm)));
989         cpumask_set_cpu(smp_processor_id(), mm_cpumask(&init_mm));
990         inc_mm_active_cpus(&init_mm);
991         mm_iommu_init(&init_mm);
992
993         irqstack_early_init();
994         exc_lvl_early_init();
995         emergency_stack_init();
996
997         mce_init();
998         smp_release_cpus();
999
1000         initmem_init();
1001
1002         /*
1003          * Reserve large chunks of memory for use by CMA for fadump, KVM and
1004          * hugetlb. These must be called after initmem_init(), so that
1005          * pageblock_order is initialised.
1006          */
1007         fadump_cma_init();
1008         kvm_cma_reserve();
1009         gigantic_hugetlb_cma_reserve();
1010
1011         early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
1012
1013         if (ppc_md.setup_arch)
1014                 ppc_md.setup_arch();
1015
1016         setup_barrier_nospec();
1017         setup_spectre_v2();
1018
1019         paging_init();
1020
1021         /* Initialize the MMU context management stuff. */
1022         mmu_context_init();
1023
1024         /* Interrupt code needs to be 64K-aligned. */
1025         if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff)
1026                 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
1027                       (unsigned long)_stext);
1028 }
This page took 0.087786 seconds and 4 git commands to generate.