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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Common boot and setup code.
5 *
6 * Copyright (C) 2001 PPC64 Team, IBM Corp
7 */
8
9#include <linux/export.h>
10#include <linux/string.h>
11#include <linux/sched.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/reboot.h>
15#include <linux/delay.h>
16#include <linux/initrd.h>
17#include <linux/seq_file.h>
18#include <linux/ioport.h>
19#include <linux/console.h>
20#include <linux/utsname.h>
21#include <linux/tty.h>
22#include <linux/root_dev.h>
23#include <linux/notifier.h>
24#include <linux/cpu.h>
25#include <linux/unistd.h>
26#include <linux/serial.h>
27#include <linux/serial_8250.h>
28#include <linux/memblock.h>
29#include <linux/pci.h>
30#include <linux/lockdep.h>
31#include <linux/memory.h>
32#include <linux/nmi.h>
33#include <linux/pgtable.h>
34
35#include <asm/debugfs.h>
36#include <asm/kvm_guest.h>
37#include <asm/io.h>
38#include <asm/kdump.h>
39#include <asm/prom.h>
40#include <asm/processor.h>
41#include <asm/smp.h>
42#include <asm/elf.h>
43#include <asm/machdep.h>
44#include <asm/paca.h>
45#include <asm/time.h>
46#include <asm/cputable.h>
47#include <asm/dt_cpu_ftrs.h>
48#include <asm/sections.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/firmware.h>
59#include <asm/xmon.h>
60#include <asm/udbg.h>
61#include <asm/kexec.h>
62#include <asm/code-patching.h>
63#include <asm/livepatch.h>
64#include <asm/opal.h>
65#include <asm/cputhreads.h>
66#include <asm/hw_irq.h>
67#include <asm/feature-fixups.h>
68#include <asm/kup.h>
69#include <asm/early_ioremap.h>
70#include <asm/pgalloc.h>
71#include <asm/asm-prototypes.h>
72
73#include "setup.h"
74
75int spinning_secondaries;
76u64 ppc64_pft_size;
77
78struct ppc64_caches ppc64_caches = {
79 .l1d = {
80 .block_size = 0x40,
81 .log_block_size = 6,
82 },
83 .l1i = {
84 .block_size = 0x40,
85 .log_block_size = 6
86 },
87};
88EXPORT_SYMBOL_GPL(ppc64_caches);
89
90#if defined(CONFIG_PPC_BOOK3E) && defined(CONFIG_SMP)
91void __init setup_tlb_core_data(void)
92{
93 int cpu;
94
95 BUILD_BUG_ON(offsetof(struct tlb_core_data, lock) != 0);
96
97 for_each_possible_cpu(cpu) {
98 int first = cpu_first_thread_sibling(cpu);
99
100 /*
101 * If we boot via kdump on a non-primary thread,
102 * make sure we point at the thread that actually
103 * set up this TLB.
104 */
105 if (cpu_first_thread_sibling(boot_cpuid) == first)
106 first = boot_cpuid;
107
108 paca_ptrs[cpu]->tcd_ptr = &paca_ptrs[first]->tcd;
109
110 /*
111 * If we have threads, we need either tlbsrx.
112 * or e6500 tablewalk mode, or else TLB handlers
113 * will be racy and could produce duplicate entries.
114 * Should we panic instead?
115 */
116 WARN_ONCE(smt_enabled_at_boot >= 2 &&
117 !mmu_has_feature(MMU_FTR_USE_TLBRSRV) &&
118 book3e_htw_mode != PPC_HTW_E6500,
119 "%s: unsupported MMU configuration\n", __func__);
120 }
121}
122#endif
123
124#ifdef CONFIG_SMP
125
126static char *smt_enabled_cmdline;
127
128/* Look for ibm,smt-enabled OF option */
129void __init check_smt_enabled(void)
130{
131 struct device_node *dn;
132 const char *smt_option;
133
134 /* Default to enabling all threads */
135 smt_enabled_at_boot = threads_per_core;
136
137 /* Allow the command line to overrule the OF option */
138 if (smt_enabled_cmdline) {
139 if (!strcmp(smt_enabled_cmdline, "on"))
140 smt_enabled_at_boot = threads_per_core;
141 else if (!strcmp(smt_enabled_cmdline, "off"))
142 smt_enabled_at_boot = 0;
143 else {
144 int smt;
145 int rc;
146
147 rc = kstrtoint(smt_enabled_cmdline, 10, &smt);
148 if (!rc)
149 smt_enabled_at_boot =
150 min(threads_per_core, smt);
151 }
152 } else {
153 dn = of_find_node_by_path("/options");
154 if (dn) {
155 smt_option = of_get_property(dn, "ibm,smt-enabled",
156 NULL);
157
158 if (smt_option) {
159 if (!strcmp(smt_option, "on"))
160 smt_enabled_at_boot = threads_per_core;
161 else if (!strcmp(smt_option, "off"))
162 smt_enabled_at_boot = 0;
163 }
164
165 of_node_put(dn);
166 }
167 }
168}
169
170/* Look for smt-enabled= cmdline option */
171static int __init early_smt_enabled(char *p)
172{
173 smt_enabled_cmdline = p;
174 return 0;
175}
176early_param("smt-enabled", early_smt_enabled);
177
178#endif /* CONFIG_SMP */
179
180/** Fix up paca fields required for the boot cpu */
181static void __init fixup_boot_paca(void)
182{
183 /* The boot cpu is started */
184 get_paca()->cpu_start = 1;
185 /* Allow percpu accesses to work until we setup percpu data */
186 get_paca()->data_offset = 0;
187 /* Mark interrupts disabled in PACA */
188 irq_soft_mask_set(IRQS_DISABLED);
189}
190
191static void __init configure_exceptions(void)
192{
193 /*
194 * Setup the trampolines from the lowmem exception vectors
195 * to the kdump kernel when not using a relocatable kernel.
196 */
197 setup_kdump_trampoline();
198
199 /* Under a PAPR hypervisor, we need hypercalls */
200 if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
201 /* Enable AIL if possible */
202 if (!pseries_enable_reloc_on_exc()) {
203 init_task.thread.fscr &= ~FSCR_SCV;
204 cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_SCV;
205 }
206
207 /*
208 * Tell the hypervisor that we want our exceptions to
209 * be taken in little endian mode.
210 *
211 * We don't call this for big endian as our calling convention
212 * makes us always enter in BE, and the call may fail under
213 * some circumstances with kdump.
214 */
215#ifdef __LITTLE_ENDIAN__
216 pseries_little_endian_exceptions();
217#endif
218 } else {
219 /* Set endian mode using OPAL */
220 if (firmware_has_feature(FW_FEATURE_OPAL))
221 opal_configure_cores();
222
223 /* AIL on native is done in cpu_ready_for_interrupts() */
224 }
225}
226
227static void cpu_ready_for_interrupts(void)
228{
229 /*
230 * Enable AIL if supported, and we are in hypervisor mode. This
231 * is called once for every processor.
232 *
233 * If we are not in hypervisor mode the job is done once for
234 * the whole partition in configure_exceptions().
235 */
236 if (cpu_has_feature(CPU_FTR_HVMODE)) {
237 unsigned long lpcr = mfspr(SPRN_LPCR);
238 unsigned long new_lpcr = lpcr;
239
240 if (cpu_has_feature(CPU_FTR_ARCH_31)) {
241 /* P10 DD1 does not have HAIL */
242 if (pvr_version_is(PVR_POWER10) &&
243 (mfspr(SPRN_PVR) & 0xf00) == 0x100)
244 new_lpcr |= LPCR_AIL_3;
245 else
246 new_lpcr |= LPCR_HAIL;
247 } else if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
248 new_lpcr |= LPCR_AIL_3;
249 }
250
251 if (new_lpcr != lpcr)
252 mtspr(SPRN_LPCR, new_lpcr);
253 }
254
255 /*
256 * Set HFSCR:TM based on CPU features:
257 * In the special case of TM no suspend (P9N DD2.1), Linux is
258 * told TM is off via the dt-ftrs but told to (partially) use
259 * it via OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED. So HFSCR[TM]
260 * will be off from dt-ftrs but we need to turn it on for the
261 * no suspend case.
262 */
263 if (cpu_has_feature(CPU_FTR_HVMODE)) {
264 if (cpu_has_feature(CPU_FTR_TM_COMP))
265 mtspr(SPRN_HFSCR, mfspr(SPRN_HFSCR) | HFSCR_TM);
266 else
267 mtspr(SPRN_HFSCR, mfspr(SPRN_HFSCR) & ~HFSCR_TM);
268 }
269
270 /* Set IR and DR in PACA MSR */
271 get_paca()->kernel_msr = MSR_KERNEL;
272}
273
274unsigned long spr_default_dscr = 0;
275
276static void __init record_spr_defaults(void)
277{
278 if (early_cpu_has_feature(CPU_FTR_DSCR))
279 spr_default_dscr = mfspr(SPRN_DSCR);
280}
281
282/*
283 * Early initialization entry point. This is called by head.S
284 * with MMU translation disabled. We rely on the "feature" of
285 * the CPU that ignores the top 2 bits of the address in real
286 * mode so we can access kernel globals normally provided we
287 * only toy with things in the RMO region. From here, we do
288 * some early parsing of the device-tree to setup out MEMBLOCK
289 * data structures, and allocate & initialize the hash table
290 * and segment tables so we can start running with translation
291 * enabled.
292 *
293 * It is this function which will call the probe() callback of
294 * the various platform types and copy the matching one to the
295 * global ppc_md structure. Your platform can eventually do
296 * some very early initializations from the probe() routine, but
297 * this is not recommended, be very careful as, for example, the
298 * device-tree is not accessible via normal means at this point.
299 */
300
301void __init early_setup(unsigned long dt_ptr)
302{
303 static __initdata struct paca_struct boot_paca;
304
305 /* -------- printk is _NOT_ safe to use here ! ------- */
306
307 /*
308 * Assume we're on cpu 0 for now.
309 *
310 * We need to load a PACA very early for a few reasons.
311 *
312 * The stack protector canary is stored in the paca, so as soon as we
313 * call any stack protected code we need r13 pointing somewhere valid.
314 *
315 * If we are using kcov it will call in_task() in its instrumentation,
316 * which relies on the current task from the PACA.
317 *
318 * dt_cpu_ftrs_init() calls into generic OF/fdt code, as well as
319 * printk(), which can trigger both stack protector and kcov.
320 *
321 * percpu variables and spin locks also use the paca.
322 *
323 * So set up a temporary paca. It will be replaced below once we know
324 * what CPU we are on.
325 */
326 initialise_paca(&boot_paca, 0);
327 setup_paca(&boot_paca);
328 fixup_boot_paca();
329
330 /* -------- printk is now safe to use ------- */
331
332 /* Try new device tree based feature discovery ... */
333 if (!dt_cpu_ftrs_init(__va(dt_ptr)))
334 /* Otherwise use the old style CPU table */
335 identify_cpu(0, mfspr(SPRN_PVR));
336
337 /* Enable early debugging if any specified (see udbg.h) */
338 udbg_early_init();
339
340 udbg_printf(" -> %s(), dt_ptr: 0x%lx\n", __func__, dt_ptr);
341
342 /*
343 * Do early initialization using the flattened device
344 * tree, such as retrieving the physical memory map or
345 * calculating/retrieving the hash table size.
346 */
347 early_init_devtree(__va(dt_ptr));
348
349 /* Now we know the logical id of our boot cpu, setup the paca. */
350 if (boot_cpuid != 0) {
351 /* Poison paca_ptrs[0] again if it's not the boot cpu */
352 memset(&paca_ptrs[0], 0x88, sizeof(paca_ptrs[0]));
353 }
354 setup_paca(paca_ptrs[boot_cpuid]);
355 fixup_boot_paca();
356
357 /*
358 * Configure exception handlers. This include setting up trampolines
359 * if needed, setting exception endian mode, etc...
360 */
361 configure_exceptions();
362
363 /*
364 * Configure Kernel Userspace Protection. This needs to happen before
365 * feature fixups for platforms that implement this using features.
366 */
367 setup_kup();
368
369 /* Apply all the dynamic patching */
370 apply_feature_fixups();
371 setup_feature_keys();
372
373 /* Initialize the hash table or TLB handling */
374 early_init_mmu();
375
376 early_ioremap_setup();
377
378 /*
379 * After firmware and early platform setup code has set things up,
380 * we note the SPR values for configurable control/performance
381 * registers, and use those as initial defaults.
382 */
383 record_spr_defaults();
384
385 /*
386 * At this point, we can let interrupts switch to virtual mode
387 * (the MMU has been setup), so adjust the MSR in the PACA to
388 * have IR and DR set and enable AIL if it exists
389 */
390 cpu_ready_for_interrupts();
391
392 /*
393 * We enable ftrace here, but since we only support DYNAMIC_FTRACE, it
394 * will only actually get enabled on the boot cpu much later once
395 * ftrace itself has been initialized.
396 */
397 this_cpu_enable_ftrace();
398
399 udbg_printf(" <- %s()\n", __func__);
400
401#ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
402 /*
403 * This needs to be done *last* (after the above udbg_printf() even)
404 *
405 * Right after we return from this function, we turn on the MMU
406 * which means the real-mode access trick that btext does will
407 * no longer work, it needs to switch to using a real MMU
408 * mapping. This call will ensure that it does
409 */
410 btext_map();
411#endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
412}
413
414#ifdef CONFIG_SMP
415void early_setup_secondary(void)
416{
417 /* Mark interrupts disabled in PACA */
418 irq_soft_mask_set(IRQS_DISABLED);
419
420 /* Initialize the hash table or TLB handling */
421 early_init_mmu_secondary();
422
423 /* Perform any KUP setup that is per-cpu */
424 setup_kup();
425
426 /*
427 * At this point, we can let interrupts switch to virtual mode
428 * (the MMU has been setup), so adjust the MSR in the PACA to
429 * have IR and DR set.
430 */
431 cpu_ready_for_interrupts();
432}
433
434#endif /* CONFIG_SMP */
435
436void panic_smp_self_stop(void)
437{
438 hard_irq_disable();
439 spin_begin();
440 while (1)
441 spin_cpu_relax();
442}
443
444#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC_CORE)
445static bool use_spinloop(void)
446{
447 if (IS_ENABLED(CONFIG_PPC_BOOK3S)) {
448 /*
449 * See comments in head_64.S -- not all platforms insert
450 * secondaries at __secondary_hold and wait at the spin
451 * loop.
452 */
453 if (firmware_has_feature(FW_FEATURE_OPAL))
454 return false;
455 return true;
456 }
457
458 /*
459 * When book3e boots from kexec, the ePAPR spin table does
460 * not get used.
461 */
462 return of_property_read_bool(of_chosen, "linux,booted-from-kexec");
463}
464
465void smp_release_cpus(void)
466{
467 unsigned long *ptr;
468 int i;
469
470 if (!use_spinloop())
471 return;
472
473 /* All secondary cpus are spinning on a common spinloop, release them
474 * all now so they can start to spin on their individual paca
475 * spinloops. For non SMP kernels, the secondary cpus never get out
476 * of the common spinloop.
477 */
478
479 ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
480 - PHYSICAL_START);
481 *ptr = ppc_function_entry(generic_secondary_smp_init);
482
483 /* And wait a bit for them to catch up */
484 for (i = 0; i < 100000; i++) {
485 mb();
486 HMT_low();
487 if (spinning_secondaries == 0)
488 break;
489 udelay(1);
490 }
491 pr_debug("spinning_secondaries = %d\n", spinning_secondaries);
492}
493#endif /* CONFIG_SMP || CONFIG_KEXEC_CORE */
494
495/*
496 * Initialize some remaining members of the ppc64_caches and systemcfg
497 * structures
498 * (at least until we get rid of them completely). This is mostly some
499 * cache informations about the CPU that will be used by cache flush
500 * routines and/or provided to userland
501 */
502
503static void init_cache_info(struct ppc_cache_info *info, u32 size, u32 lsize,
504 u32 bsize, u32 sets)
505{
506 info->size = size;
507 info->sets = sets;
508 info->line_size = lsize;
509 info->block_size = bsize;
510 info->log_block_size = __ilog2(bsize);
511 if (bsize)
512 info->blocks_per_page = PAGE_SIZE / bsize;
513 else
514 info->blocks_per_page = 0;
515
516 if (sets == 0)
517 info->assoc = 0xffff;
518 else
519 info->assoc = size / (sets * lsize);
520}
521
522static bool __init parse_cache_info(struct device_node *np,
523 bool icache,
524 struct ppc_cache_info *info)
525{
526 static const char *ipropnames[] __initdata = {
527 "i-cache-size",
528 "i-cache-sets",
529 "i-cache-block-size",
530 "i-cache-line-size",
531 };
532 static const char *dpropnames[] __initdata = {
533 "d-cache-size",
534 "d-cache-sets",
535 "d-cache-block-size",
536 "d-cache-line-size",
537 };
538 const char **propnames = icache ? ipropnames : dpropnames;
539 const __be32 *sizep, *lsizep, *bsizep, *setsp;
540 u32 size, lsize, bsize, sets;
541 bool success = true;
542
543 size = 0;
544 sets = -1u;
545 lsize = bsize = cur_cpu_spec->dcache_bsize;
546 sizep = of_get_property(np, propnames[0], NULL);
547 if (sizep != NULL)
548 size = be32_to_cpu(*sizep);
549 setsp = of_get_property(np, propnames[1], NULL);
550 if (setsp != NULL)
551 sets = be32_to_cpu(*setsp);
552 bsizep = of_get_property(np, propnames[2], NULL);
553 lsizep = of_get_property(np, propnames[3], NULL);
554 if (bsizep == NULL)
555 bsizep = lsizep;
556 if (lsizep == NULL)
557 lsizep = bsizep;
558 if (lsizep != NULL)
559 lsize = be32_to_cpu(*lsizep);
560 if (bsizep != NULL)
561 bsize = be32_to_cpu(*bsizep);
562 if (sizep == NULL || bsizep == NULL || lsizep == NULL)
563 success = false;
564
565 /*
566 * OF is weird .. it represents fully associative caches
567 * as "1 way" which doesn't make much sense and doesn't
568 * leave room for direct mapped. We'll assume that 0
569 * in OF means direct mapped for that reason.
570 */
571 if (sets == 1)
572 sets = 0;
573 else if (sets == 0)
574 sets = 1;
575
576 init_cache_info(info, size, lsize, bsize, sets);
577
578 return success;
579}
580
581void __init initialize_cache_info(void)
582{
583 struct device_node *cpu = NULL, *l2, *l3 = NULL;
584 u32 pvr;
585
586 /*
587 * All shipping POWER8 machines have a firmware bug that
588 * puts incorrect information in the device-tree. This will
589 * be (hopefully) fixed for future chips but for now hard
590 * code the values if we are running on one of these
591 */
592 pvr = PVR_VER(mfspr(SPRN_PVR));
593 if (pvr == PVR_POWER8 || pvr == PVR_POWER8E ||
594 pvr == PVR_POWER8NVL) {
595 /* size lsize blk sets */
596 init_cache_info(&ppc64_caches.l1i, 0x8000, 128, 128, 32);
597 init_cache_info(&ppc64_caches.l1d, 0x10000, 128, 128, 64);
598 init_cache_info(&ppc64_caches.l2, 0x80000, 128, 0, 512);
599 init_cache_info(&ppc64_caches.l3, 0x800000, 128, 0, 8192);
600 } else
601 cpu = of_find_node_by_type(NULL, "cpu");
602
603 /*
604 * We're assuming *all* of the CPUs have the same
605 * d-cache and i-cache sizes... -Peter
606 */
607 if (cpu) {
608 if (!parse_cache_info(cpu, false, &ppc64_caches.l1d))
609 pr_warn("Argh, can't find dcache properties !\n");
610
611 if (!parse_cache_info(cpu, true, &ppc64_caches.l1i))
612 pr_warn("Argh, can't find icache properties !\n");
613
614 /*
615 * Try to find the L2 and L3 if any. Assume they are
616 * unified and use the D-side properties.
617 */
618 l2 = of_find_next_cache_node(cpu);
619 of_node_put(cpu);
620 if (l2) {
621 parse_cache_info(l2, false, &ppc64_caches.l2);
622 l3 = of_find_next_cache_node(l2);
623 of_node_put(l2);
624 }
625 if (l3) {
626 parse_cache_info(l3, false, &ppc64_caches.l3);
627 of_node_put(l3);
628 }
629 }
630
631 /* For use by binfmt_elf */
632 dcache_bsize = ppc64_caches.l1d.block_size;
633 icache_bsize = ppc64_caches.l1i.block_size;
634
635 cur_cpu_spec->dcache_bsize = dcache_bsize;
636 cur_cpu_spec->icache_bsize = icache_bsize;
637}
638
639/*
640 * This returns the limit below which memory accesses to the linear
641 * mapping are guarnateed not to cause an architectural exception (e.g.,
642 * TLB or SLB miss fault).
643 *
644 * This is used to allocate PACAs and various interrupt stacks that
645 * that are accessed early in interrupt handlers that must not cause
646 * re-entrant interrupts.
647 */
648__init u64 ppc64_bolted_size(void)
649{
650#ifdef CONFIG_PPC_BOOK3E
651 /* Freescale BookE bolts the entire linear mapping */
652 /* XXX: BookE ppc64_rma_limit setup seems to disagree? */
653 if (early_mmu_has_feature(MMU_FTR_TYPE_FSL_E))
654 return linear_map_top;
655 /* Other BookE, we assume the first GB is bolted */
656 return 1ul << 30;
657#else
658 /* BookS radix, does not take faults on linear mapping */
659 if (early_radix_enabled())
660 return ULONG_MAX;
661
662 /* BookS hash, the first segment is bolted */
663 if (early_mmu_has_feature(MMU_FTR_1T_SEGMENT))
664 return 1UL << SID_SHIFT_1T;
665 return 1UL << SID_SHIFT;
666#endif
667}
668
669static void *__init alloc_stack(unsigned long limit, int cpu)
670{
671 void *ptr;
672
673 BUILD_BUG_ON(STACK_INT_FRAME_SIZE % 16);
674
675 ptr = memblock_alloc_try_nid(THREAD_SIZE, THREAD_ALIGN,
676 MEMBLOCK_LOW_LIMIT, limit,
677 early_cpu_to_node(cpu));
678 if (!ptr)
679 panic("cannot allocate stacks");
680
681 return ptr;
682}
683
684void __init irqstack_early_init(void)
685{
686 u64 limit = ppc64_bolted_size();
687 unsigned int i;
688
689 /*
690 * Interrupt stacks must be in the first segment since we
691 * cannot afford to take SLB misses on them. They are not
692 * accessed in realmode.
693 */
694 for_each_possible_cpu(i) {
695 softirq_ctx[i] = alloc_stack(limit, i);
696 hardirq_ctx[i] = alloc_stack(limit, i);
697 }
698}
699
700#ifdef CONFIG_PPC_BOOK3E
701void __init exc_lvl_early_init(void)
702{
703 unsigned int i;
704
705 for_each_possible_cpu(i) {
706 void *sp;
707
708 sp = alloc_stack(ULONG_MAX, i);
709 critirq_ctx[i] = sp;
710 paca_ptrs[i]->crit_kstack = sp + THREAD_SIZE;
711
712 sp = alloc_stack(ULONG_MAX, i);
713 dbgirq_ctx[i] = sp;
714 paca_ptrs[i]->dbg_kstack = sp + THREAD_SIZE;
715
716 sp = alloc_stack(ULONG_MAX, i);
717 mcheckirq_ctx[i] = sp;
718 paca_ptrs[i]->mc_kstack = sp + THREAD_SIZE;
719 }
720
721 if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC))
722 patch_exception(0x040, exc_debug_debug_book3e);
723}
724#endif
725
726/*
727 * Stack space used when we detect a bad kernel stack pointer, and
728 * early in SMP boots before relocation is enabled. Exclusive emergency
729 * stack for machine checks.
730 */
731void __init emergency_stack_init(void)
732{
733 u64 limit, mce_limit;
734 unsigned int i;
735
736 /*
737 * Emergency stacks must be under 256MB, we cannot afford to take
738 * SLB misses on them. The ABI also requires them to be 128-byte
739 * aligned.
740 *
741 * Since we use these as temporary stacks during secondary CPU
742 * bringup, machine check, system reset, and HMI, we need to get
743 * at them in real mode. This means they must also be within the RMO
744 * region.
745 *
746 * The IRQ stacks allocated elsewhere in this file are zeroed and
747 * initialized in kernel/irq.c. These are initialized here in order
748 * to have emergency stacks available as early as possible.
749 */
750 limit = mce_limit = min(ppc64_bolted_size(), ppc64_rma_size);
751
752 /*
753 * Machine check on pseries calls rtas, but can't use the static
754 * rtas_args due to a machine check hitting while the lock is held.
755 * rtas args have to be under 4GB, so the machine check stack is
756 * limited to 4GB so args can be put on stack.
757 */
758 if (firmware_has_feature(FW_FEATURE_LPAR) && mce_limit > SZ_4G)
759 mce_limit = SZ_4G;
760
761 for_each_possible_cpu(i) {
762 paca_ptrs[i]->emergency_sp = alloc_stack(limit, i) + THREAD_SIZE;
763
764#ifdef CONFIG_PPC_BOOK3S_64
765 /* emergency stack for NMI exception handling. */
766 paca_ptrs[i]->nmi_emergency_sp = alloc_stack(limit, i) + THREAD_SIZE;
767
768 /* emergency stack for machine check exception handling. */
769 paca_ptrs[i]->mc_emergency_sp = alloc_stack(mce_limit, i) + THREAD_SIZE;
770#endif
771 }
772}
773
774#ifdef CONFIG_SMP
775/**
776 * pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu
777 * @cpu: cpu to allocate for
778 * @size: size allocation in bytes
779 * @align: alignment
780 *
781 * Allocate @size bytes aligned at @align for cpu @cpu. This wrapper
782 * does the right thing for NUMA regardless of the current
783 * configuration.
784 *
785 * RETURNS:
786 * Pointer to the allocated area on success, NULL on failure.
787 */
788static void * __init pcpu_alloc_bootmem(unsigned int cpu, size_t size,
789 size_t align)
790{
791 const unsigned long goal = __pa(MAX_DMA_ADDRESS);
792#ifdef CONFIG_NUMA
793 int node = early_cpu_to_node(cpu);
794 void *ptr;
795
796 if (!node_online(node) || !NODE_DATA(node)) {
797 ptr = memblock_alloc_from(size, align, goal);
798 pr_info("cpu %d has no node %d or node-local memory\n",
799 cpu, node);
800 pr_debug("per cpu data for cpu%d %lu bytes at %016lx\n",
801 cpu, size, __pa(ptr));
802 } else {
803 ptr = memblock_alloc_try_nid(size, align, goal,
804 MEMBLOCK_ALLOC_ACCESSIBLE, node);
805 pr_debug("per cpu data for cpu%d %lu bytes on node%d at "
806 "%016lx\n", cpu, size, node, __pa(ptr));
807 }
808 return ptr;
809#else
810 return memblock_alloc_from(size, align, goal);
811#endif
812}
813
814static void __init pcpu_free_bootmem(void *ptr, size_t size)
815{
816 memblock_free(__pa(ptr), size);
817}
818
819static int pcpu_cpu_distance(unsigned int from, unsigned int to)
820{
821 if (early_cpu_to_node(from) == early_cpu_to_node(to))
822 return LOCAL_DISTANCE;
823 else
824 return REMOTE_DISTANCE;
825}
826
827unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
828EXPORT_SYMBOL(__per_cpu_offset);
829
830static void __init pcpu_populate_pte(unsigned long addr)
831{
832 pgd_t *pgd = pgd_offset_k(addr);
833 p4d_t *p4d;
834 pud_t *pud;
835 pmd_t *pmd;
836
837 p4d = p4d_offset(pgd, addr);
838 if (p4d_none(*p4d)) {
839 pud_t *new;
840
841 new = memblock_alloc(PUD_TABLE_SIZE, PUD_TABLE_SIZE);
842 if (!new)
843 goto err_alloc;
844 p4d_populate(&init_mm, p4d, new);
845 }
846
847 pud = pud_offset(p4d, addr);
848 if (pud_none(*pud)) {
849 pmd_t *new;
850
851 new = memblock_alloc(PMD_TABLE_SIZE, PMD_TABLE_SIZE);
852 if (!new)
853 goto err_alloc;
854 pud_populate(&init_mm, pud, new);
855 }
856
857 pmd = pmd_offset(pud, addr);
858 if (!pmd_present(*pmd)) {
859 pte_t *new;
860
861 new = memblock_alloc(PTE_TABLE_SIZE, PTE_TABLE_SIZE);
862 if (!new)
863 goto err_alloc;
864 pmd_populate_kernel(&init_mm, pmd, new);
865 }
866
867 return;
868
869err_alloc:
870 panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
871 __func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
872}
873
874
875void __init setup_per_cpu_areas(void)
876{
877 const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
878 size_t atom_size;
879 unsigned long delta;
880 unsigned int cpu;
881 int rc = -EINVAL;
882
883 /*
884 * Linear mapping is one of 4K, 1M and 16M. For 4K, no need
885 * to group units. For larger mappings, use 1M atom which
886 * should be large enough to contain a number of units.
887 */
888 if (mmu_linear_psize == MMU_PAGE_4K)
889 atom_size = PAGE_SIZE;
890 else
891 atom_size = 1 << 20;
892
893 if (pcpu_chosen_fc != PCPU_FC_PAGE) {
894 rc = pcpu_embed_first_chunk(0, dyn_size, atom_size, pcpu_cpu_distance,
895 pcpu_alloc_bootmem, pcpu_free_bootmem);
896 if (rc)
897 pr_warn("PERCPU: %s allocator failed (%d), "
898 "falling back to page size\n",
899 pcpu_fc_names[pcpu_chosen_fc], rc);
900 }
901
902 if (rc < 0)
903 rc = pcpu_page_first_chunk(0, pcpu_alloc_bootmem, pcpu_free_bootmem,
904 pcpu_populate_pte);
905 if (rc < 0)
906 panic("cannot initialize percpu area (err=%d)", rc);
907
908 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
909 for_each_possible_cpu(cpu) {
910 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
911 paca_ptrs[cpu]->data_offset = __per_cpu_offset[cpu];
912 }
913}
914#endif
915
916#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
917unsigned long memory_block_size_bytes(void)
918{
919 if (ppc_md.memory_block_size)
920 return ppc_md.memory_block_size();
921
922 return MIN_MEMORY_BLOCK_SIZE;
923}
924#endif
925
926#if defined(CONFIG_PPC_INDIRECT_PIO) || defined(CONFIG_PPC_INDIRECT_MMIO)
927struct ppc_pci_io ppc_pci_io;
928EXPORT_SYMBOL(ppc_pci_io);
929#endif
930
931#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
932u64 hw_nmi_get_sample_period(int watchdog_thresh)
933{
934 return ppc_proc_freq * watchdog_thresh;
935}
936#endif
937
938/*
939 * The perf based hardlockup detector breaks PMU event based branches, so
940 * disable it by default. Book3S has a soft-nmi hardlockup detector based
941 * on the decrementer interrupt, so it does not suffer from this problem.
942 *
943 * It is likely to get false positives in KVM guests, so disable it there
944 * by default too. PowerVM will not stop or arbitrarily oversubscribe
945 * CPUs, but give a minimum regular allotment even with SPLPAR, so enable
946 * the detector for non-KVM guests, assume PowerVM.
947 */
948static int __init disable_hardlockup_detector(void)
949{
950#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
951 hardlockup_detector_disable();
952#else
953 if (firmware_has_feature(FW_FEATURE_LPAR)) {
954 if (is_kvm_guest())
955 hardlockup_detector_disable();
956 }
957#endif
958
959 return 0;
960}
961early_initcall(disable_hardlockup_detector);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Common boot and setup code.
5 *
6 * Copyright (C) 2001 PPC64 Team, IBM Corp
7 */
8
9#include <linux/export.h>
10#include <linux/string.h>
11#include <linux/sched.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/reboot.h>
15#include <linux/delay.h>
16#include <linux/initrd.h>
17#include <linux/seq_file.h>
18#include <linux/ioport.h>
19#include <linux/console.h>
20#include <linux/utsname.h>
21#include <linux/tty.h>
22#include <linux/root_dev.h>
23#include <linux/notifier.h>
24#include <linux/cpu.h>
25#include <linux/unistd.h>
26#include <linux/serial.h>
27#include <linux/serial_8250.h>
28#include <linux/memblock.h>
29#include <linux/pci.h>
30#include <linux/lockdep.h>
31#include <linux/memory.h>
32#include <linux/nmi.h>
33#include <linux/pgtable.h>
34#include <linux/of.h>
35#include <linux/of_fdt.h>
36
37#include <asm/asm-prototypes.h>
38#include <asm/kvm_guest.h>
39#include <asm/io.h>
40#include <asm/kdump.h>
41#include <asm/processor.h>
42#include <asm/smp.h>
43#include <asm/elf.h>
44#include <asm/machdep.h>
45#include <asm/paca.h>
46#include <asm/time.h>
47#include <asm/cputable.h>
48#include <asm/dt_cpu_ftrs.h>
49#include <asm/sections.h>
50#include <asm/btext.h>
51#include <asm/nvram.h>
52#include <asm/setup.h>
53#include <asm/rtas.h>
54#include <asm/iommu.h>
55#include <asm/serial.h>
56#include <asm/cache.h>
57#include <asm/page.h>
58#include <asm/mmu.h>
59#include <asm/firmware.h>
60#include <asm/xmon.h>
61#include <asm/udbg.h>
62#include <asm/kexec.h>
63#include <asm/code-patching.h>
64#include <asm/ftrace.h>
65#include <asm/opal.h>
66#include <asm/cputhreads.h>
67#include <asm/hw_irq.h>
68#include <asm/feature-fixups.h>
69#include <asm/kup.h>
70#include <asm/early_ioremap.h>
71#include <asm/pgalloc.h>
72
73#include "setup.h"
74
75int spinning_secondaries;
76u64 ppc64_pft_size;
77
78struct ppc64_caches ppc64_caches = {
79 .l1d = {
80 .block_size = 0x40,
81 .log_block_size = 6,
82 },
83 .l1i = {
84 .block_size = 0x40,
85 .log_block_size = 6
86 },
87};
88EXPORT_SYMBOL_GPL(ppc64_caches);
89
90#if defined(CONFIG_PPC_BOOK3E_64) && defined(CONFIG_SMP)
91void __init setup_tlb_core_data(void)
92{
93 int cpu;
94
95 BUILD_BUG_ON(offsetof(struct tlb_core_data, lock) != 0);
96
97 for_each_possible_cpu(cpu) {
98 int first = cpu_first_thread_sibling(cpu);
99
100 /*
101 * If we boot via kdump on a non-primary thread,
102 * make sure we point at the thread that actually
103 * set up this TLB.
104 */
105 if (cpu_first_thread_sibling(boot_cpuid) == first)
106 first = boot_cpuid;
107
108 paca_ptrs[cpu]->tcd_ptr = &paca_ptrs[first]->tcd;
109
110 /*
111 * If we have threads, we need either tlbsrx.
112 * or e6500 tablewalk mode, or else TLB handlers
113 * will be racy and could produce duplicate entries.
114 * Should we panic instead?
115 */
116 WARN_ONCE(smt_enabled_at_boot >= 2 &&
117 book3e_htw_mode != PPC_HTW_E6500,
118 "%s: unsupported MMU configuration\n", __func__);
119 }
120}
121#endif
122
123#ifdef CONFIG_SMP
124
125static char *smt_enabled_cmdline;
126
127/* Look for ibm,smt-enabled OF option */
128void __init check_smt_enabled(void)
129{
130 struct device_node *dn;
131 const char *smt_option;
132
133 /* Default to enabling all threads */
134 smt_enabled_at_boot = threads_per_core;
135
136 /* Allow the command line to overrule the OF option */
137 if (smt_enabled_cmdline) {
138 if (!strcmp(smt_enabled_cmdline, "on"))
139 smt_enabled_at_boot = threads_per_core;
140 else if (!strcmp(smt_enabled_cmdline, "off"))
141 smt_enabled_at_boot = 0;
142 else {
143 int smt;
144 int rc;
145
146 rc = kstrtoint(smt_enabled_cmdline, 10, &smt);
147 if (!rc)
148 smt_enabled_at_boot =
149 min(threads_per_core, smt);
150 }
151 } else {
152 dn = of_find_node_by_path("/options");
153 if (dn) {
154 smt_option = of_get_property(dn, "ibm,smt-enabled",
155 NULL);
156
157 if (smt_option) {
158 if (!strcmp(smt_option, "on"))
159 smt_enabled_at_boot = threads_per_core;
160 else if (!strcmp(smt_option, "off"))
161 smt_enabled_at_boot = 0;
162 }
163
164 of_node_put(dn);
165 }
166 }
167}
168
169/* Look for smt-enabled= cmdline option */
170static int __init early_smt_enabled(char *p)
171{
172 smt_enabled_cmdline = p;
173 return 0;
174}
175early_param("smt-enabled", early_smt_enabled);
176
177#endif /* CONFIG_SMP */
178
179/** Fix up paca fields required for the boot cpu */
180static void __init fixup_boot_paca(struct paca_struct *boot_paca)
181{
182 /* The boot cpu is started */
183 boot_paca->cpu_start = 1;
184#ifdef CONFIG_PPC_BOOK3S_64
185 /*
186 * Give the early boot machine check stack somewhere to use, use
187 * half of the init stack. This is a bit hacky but there should not be
188 * deep stack usage in early init so shouldn't overflow it or overwrite
189 * things.
190 */
191 boot_paca->mc_emergency_sp = (void *)&init_thread_union +
192 (THREAD_SIZE/2);
193#endif
194 /* Allow percpu accesses to work until we setup percpu data */
195 boot_paca->data_offset = 0;
196 /* Mark interrupts soft and hard disabled in PACA */
197 boot_paca->irq_soft_mask = IRQS_DISABLED;
198 boot_paca->irq_happened = PACA_IRQ_HARD_DIS;
199 WARN_ON(mfmsr() & MSR_EE);
200}
201
202static void __init configure_exceptions(void)
203{
204 /*
205 * Setup the trampolines from the lowmem exception vectors
206 * to the kdump kernel when not using a relocatable kernel.
207 */
208 setup_kdump_trampoline();
209
210 /* Under a PAPR hypervisor, we need hypercalls */
211 if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
212 /*
213 * - PR KVM does not support AIL mode interrupts in the host
214 * while a PR guest is running.
215 *
216 * - SCV system call interrupt vectors are only implemented for
217 * AIL mode interrupts.
218 *
219 * - On pseries, AIL mode can only be enabled and disabled
220 * system-wide so when a PR VM is created on a pseries host,
221 * all CPUs of the host are set to AIL=0 mode.
222 *
223 * - Therefore host CPUs must not execute scv while a PR VM
224 * exists.
225 *
226 * - SCV support can not be disabled dynamically because the
227 * feature is advertised to host userspace. Disabling the
228 * facility and emulating it would be possible but is not
229 * implemented.
230 *
231 * - So SCV support is blanket disabled if PR KVM could possibly
232 * run. That is, PR support compiled in, booting on pseries
233 * with hash MMU.
234 */
235 if (IS_ENABLED(CONFIG_KVM_BOOK3S_PR_POSSIBLE) && !radix_enabled()) {
236 init_task.thread.fscr &= ~FSCR_SCV;
237 cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_SCV;
238 }
239
240 /* Enable AIL if possible */
241 if (!pseries_enable_reloc_on_exc()) {
242 init_task.thread.fscr &= ~FSCR_SCV;
243 cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_SCV;
244 }
245
246 /*
247 * Tell the hypervisor that we want our exceptions to
248 * be taken in little endian mode.
249 *
250 * We don't call this for big endian as our calling convention
251 * makes us always enter in BE, and the call may fail under
252 * some circumstances with kdump.
253 */
254#ifdef __LITTLE_ENDIAN__
255 pseries_little_endian_exceptions();
256#endif
257 } else {
258 /* Set endian mode using OPAL */
259 if (firmware_has_feature(FW_FEATURE_OPAL))
260 opal_configure_cores();
261
262 /* AIL on native is done in cpu_ready_for_interrupts() */
263 }
264}
265
266static void cpu_ready_for_interrupts(void)
267{
268 /*
269 * Enable AIL if supported, and we are in hypervisor mode. This
270 * is called once for every processor.
271 *
272 * If we are not in hypervisor mode the job is done once for
273 * the whole partition in configure_exceptions().
274 */
275 if (cpu_has_feature(CPU_FTR_HVMODE)) {
276 unsigned long lpcr = mfspr(SPRN_LPCR);
277 unsigned long new_lpcr = lpcr;
278
279 if (cpu_has_feature(CPU_FTR_ARCH_31)) {
280 /* P10 DD1 does not have HAIL */
281 if (pvr_version_is(PVR_POWER10) &&
282 (mfspr(SPRN_PVR) & 0xf00) == 0x100)
283 new_lpcr |= LPCR_AIL_3;
284 else
285 new_lpcr |= LPCR_HAIL;
286 } else if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
287 new_lpcr |= LPCR_AIL_3;
288 }
289
290 if (new_lpcr != lpcr)
291 mtspr(SPRN_LPCR, new_lpcr);
292 }
293
294 /*
295 * Set HFSCR:TM based on CPU features:
296 * In the special case of TM no suspend (P9N DD2.1), Linux is
297 * told TM is off via the dt-ftrs but told to (partially) use
298 * it via OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED. So HFSCR[TM]
299 * will be off from dt-ftrs but we need to turn it on for the
300 * no suspend case.
301 */
302 if (cpu_has_feature(CPU_FTR_HVMODE)) {
303 if (cpu_has_feature(CPU_FTR_TM_COMP))
304 mtspr(SPRN_HFSCR, mfspr(SPRN_HFSCR) | HFSCR_TM);
305 else
306 mtspr(SPRN_HFSCR, mfspr(SPRN_HFSCR) & ~HFSCR_TM);
307 }
308
309 /* Set IR and DR in PACA MSR */
310 get_paca()->kernel_msr = MSR_KERNEL;
311}
312
313unsigned long spr_default_dscr = 0;
314
315static void __init record_spr_defaults(void)
316{
317 if (early_cpu_has_feature(CPU_FTR_DSCR))
318 spr_default_dscr = mfspr(SPRN_DSCR);
319}
320
321/*
322 * Early initialization entry point. This is called by head.S
323 * with MMU translation disabled. We rely on the "feature" of
324 * the CPU that ignores the top 2 bits of the address in real
325 * mode so we can access kernel globals normally provided we
326 * only toy with things in the RMO region. From here, we do
327 * some early parsing of the device-tree to setup out MEMBLOCK
328 * data structures, and allocate & initialize the hash table
329 * and segment tables so we can start running with translation
330 * enabled.
331 *
332 * It is this function which will call the probe() callback of
333 * the various platform types and copy the matching one to the
334 * global ppc_md structure. Your platform can eventually do
335 * some very early initializations from the probe() routine, but
336 * this is not recommended, be very careful as, for example, the
337 * device-tree is not accessible via normal means at this point.
338 */
339
340void __init early_setup(unsigned long dt_ptr)
341{
342 static __initdata struct paca_struct boot_paca;
343
344 /* -------- printk is _NOT_ safe to use here ! ------- */
345
346 /*
347 * Assume we're on cpu 0 for now.
348 *
349 * We need to load a PACA very early for a few reasons.
350 *
351 * The stack protector canary is stored in the paca, so as soon as we
352 * call any stack protected code we need r13 pointing somewhere valid.
353 *
354 * If we are using kcov it will call in_task() in its instrumentation,
355 * which relies on the current task from the PACA.
356 *
357 * dt_cpu_ftrs_init() calls into generic OF/fdt code, as well as
358 * printk(), which can trigger both stack protector and kcov.
359 *
360 * percpu variables and spin locks also use the paca.
361 *
362 * So set up a temporary paca. It will be replaced below once we know
363 * what CPU we are on.
364 */
365 initialise_paca(&boot_paca, 0);
366 fixup_boot_paca(&boot_paca);
367 WARN_ON(local_paca);
368 setup_paca(&boot_paca); /* install the paca into registers */
369
370 /* -------- printk is now safe to use ------- */
371
372 if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && (mfmsr() & MSR_HV))
373 enable_machine_check();
374
375 /* Try new device tree based feature discovery ... */
376 if (!dt_cpu_ftrs_init(__va(dt_ptr)))
377 /* Otherwise use the old style CPU table */
378 identify_cpu(0, mfspr(SPRN_PVR));
379
380 /* Enable early debugging if any specified (see udbg.h) */
381 udbg_early_init();
382
383 udbg_printf(" -> %s(), dt_ptr: 0x%lx\n", __func__, dt_ptr);
384
385 /*
386 * Do early initialization using the flattened device
387 * tree, such as retrieving the physical memory map or
388 * calculating/retrieving the hash table size, discover
389 * boot_cpuid and boot_cpu_hwid.
390 */
391 early_init_devtree(__va(dt_ptr));
392
393 allocate_paca_ptrs();
394 allocate_paca(boot_cpuid);
395 set_hard_smp_processor_id(boot_cpuid, boot_cpu_hwid);
396 fixup_boot_paca(paca_ptrs[boot_cpuid]);
397 setup_paca(paca_ptrs[boot_cpuid]); /* install the paca into registers */
398 // smp_processor_id() now reports boot_cpuid
399
400#ifdef CONFIG_SMP
401 task_thread_info(current)->cpu = boot_cpuid; // fix task_cpu(current)
402#endif
403
404 /*
405 * Configure exception handlers. This include setting up trampolines
406 * if needed, setting exception endian mode, etc...
407 */
408 configure_exceptions();
409
410 /*
411 * Configure Kernel Userspace Protection. This needs to happen before
412 * feature fixups for platforms that implement this using features.
413 */
414 setup_kup();
415
416 /* Apply all the dynamic patching */
417 apply_feature_fixups();
418 setup_feature_keys();
419
420 /* Initialize the hash table or TLB handling */
421 early_init_mmu();
422
423 early_ioremap_setup();
424
425 /*
426 * After firmware and early platform setup code has set things up,
427 * we note the SPR values for configurable control/performance
428 * registers, and use those as initial defaults.
429 */
430 record_spr_defaults();
431
432 /*
433 * At this point, we can let interrupts switch to virtual mode
434 * (the MMU has been setup), so adjust the MSR in the PACA to
435 * have IR and DR set and enable AIL if it exists
436 */
437 cpu_ready_for_interrupts();
438
439 /*
440 * We enable ftrace here, but since we only support DYNAMIC_FTRACE, it
441 * will only actually get enabled on the boot cpu much later once
442 * ftrace itself has been initialized.
443 */
444 this_cpu_enable_ftrace();
445
446 udbg_printf(" <- %s()\n", __func__);
447
448#ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
449 /*
450 * This needs to be done *last* (after the above udbg_printf() even)
451 *
452 * Right after we return from this function, we turn on the MMU
453 * which means the real-mode access trick that btext does will
454 * no longer work, it needs to switch to using a real MMU
455 * mapping. This call will ensure that it does
456 */
457 btext_map();
458#endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
459}
460
461#ifdef CONFIG_SMP
462void early_setup_secondary(void)
463{
464 /* Mark interrupts disabled in PACA */
465 irq_soft_mask_set(IRQS_DISABLED);
466
467 /* Initialize the hash table or TLB handling */
468 early_init_mmu_secondary();
469
470 /* Perform any KUP setup that is per-cpu */
471 setup_kup();
472
473 /*
474 * At this point, we can let interrupts switch to virtual mode
475 * (the MMU has been setup), so adjust the MSR in the PACA to
476 * have IR and DR set.
477 */
478 cpu_ready_for_interrupts();
479}
480
481#endif /* CONFIG_SMP */
482
483void __noreturn panic_smp_self_stop(void)
484{
485 hard_irq_disable();
486 spin_begin();
487 while (1)
488 spin_cpu_relax();
489}
490
491#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC_CORE)
492static bool use_spinloop(void)
493{
494 if (IS_ENABLED(CONFIG_PPC_BOOK3S)) {
495 /*
496 * See comments in head_64.S -- not all platforms insert
497 * secondaries at __secondary_hold and wait at the spin
498 * loop.
499 */
500 if (firmware_has_feature(FW_FEATURE_OPAL))
501 return false;
502 return true;
503 }
504
505 /*
506 * When book3e boots from kexec, the ePAPR spin table does
507 * not get used.
508 */
509 return of_property_read_bool(of_chosen, "linux,booted-from-kexec");
510}
511
512void smp_release_cpus(void)
513{
514 unsigned long *ptr;
515 int i;
516
517 if (!use_spinloop())
518 return;
519
520 /* All secondary cpus are spinning on a common spinloop, release them
521 * all now so they can start to spin on their individual paca
522 * spinloops. For non SMP kernels, the secondary cpus never get out
523 * of the common spinloop.
524 */
525
526 ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
527 - PHYSICAL_START);
528 *ptr = ppc_function_entry(generic_secondary_smp_init);
529
530 /* And wait a bit for them to catch up */
531 for (i = 0; i < 100000; i++) {
532 mb();
533 HMT_low();
534 if (spinning_secondaries == 0)
535 break;
536 udelay(1);
537 }
538 pr_debug("spinning_secondaries = %d\n", spinning_secondaries);
539}
540#endif /* CONFIG_SMP || CONFIG_KEXEC_CORE */
541
542/*
543 * Initialize some remaining members of the ppc64_caches and systemcfg
544 * structures
545 * (at least until we get rid of them completely). This is mostly some
546 * cache informations about the CPU that will be used by cache flush
547 * routines and/or provided to userland
548 */
549
550static void __init init_cache_info(struct ppc_cache_info *info, u32 size, u32 lsize,
551 u32 bsize, u32 sets)
552{
553 info->size = size;
554 info->sets = sets;
555 info->line_size = lsize;
556 info->block_size = bsize;
557 info->log_block_size = __ilog2(bsize);
558 if (bsize)
559 info->blocks_per_page = PAGE_SIZE / bsize;
560 else
561 info->blocks_per_page = 0;
562
563 if (sets == 0)
564 info->assoc = 0xffff;
565 else
566 info->assoc = size / (sets * lsize);
567}
568
569static bool __init parse_cache_info(struct device_node *np,
570 bool icache,
571 struct ppc_cache_info *info)
572{
573 static const char *ipropnames[] __initdata = {
574 "i-cache-size",
575 "i-cache-sets",
576 "i-cache-block-size",
577 "i-cache-line-size",
578 };
579 static const char *dpropnames[] __initdata = {
580 "d-cache-size",
581 "d-cache-sets",
582 "d-cache-block-size",
583 "d-cache-line-size",
584 };
585 const char **propnames = icache ? ipropnames : dpropnames;
586 const __be32 *sizep, *lsizep, *bsizep, *setsp;
587 u32 size, lsize, bsize, sets;
588 bool success = true;
589
590 size = 0;
591 sets = -1u;
592 lsize = bsize = cur_cpu_spec->dcache_bsize;
593 sizep = of_get_property(np, propnames[0], NULL);
594 if (sizep != NULL)
595 size = be32_to_cpu(*sizep);
596 setsp = of_get_property(np, propnames[1], NULL);
597 if (setsp != NULL)
598 sets = be32_to_cpu(*setsp);
599 bsizep = of_get_property(np, propnames[2], NULL);
600 lsizep = of_get_property(np, propnames[3], NULL);
601 if (bsizep == NULL)
602 bsizep = lsizep;
603 if (lsizep == NULL)
604 lsizep = bsizep;
605 if (lsizep != NULL)
606 lsize = be32_to_cpu(*lsizep);
607 if (bsizep != NULL)
608 bsize = be32_to_cpu(*bsizep);
609 if (sizep == NULL || bsizep == NULL || lsizep == NULL)
610 success = false;
611
612 /*
613 * OF is weird .. it represents fully associative caches
614 * as "1 way" which doesn't make much sense and doesn't
615 * leave room for direct mapped. We'll assume that 0
616 * in OF means direct mapped for that reason.
617 */
618 if (sets == 1)
619 sets = 0;
620 else if (sets == 0)
621 sets = 1;
622
623 init_cache_info(info, size, lsize, bsize, sets);
624
625 return success;
626}
627
628void __init initialize_cache_info(void)
629{
630 struct device_node *cpu = NULL, *l2, *l3 = NULL;
631 u32 pvr;
632
633 /*
634 * All shipping POWER8 machines have a firmware bug that
635 * puts incorrect information in the device-tree. This will
636 * be (hopefully) fixed for future chips but for now hard
637 * code the values if we are running on one of these
638 */
639 pvr = PVR_VER(mfspr(SPRN_PVR));
640 if (pvr == PVR_POWER8 || pvr == PVR_POWER8E ||
641 pvr == PVR_POWER8NVL) {
642 /* size lsize blk sets */
643 init_cache_info(&ppc64_caches.l1i, 0x8000, 128, 128, 32);
644 init_cache_info(&ppc64_caches.l1d, 0x10000, 128, 128, 64);
645 init_cache_info(&ppc64_caches.l2, 0x80000, 128, 0, 512);
646 init_cache_info(&ppc64_caches.l3, 0x800000, 128, 0, 8192);
647 } else
648 cpu = of_find_node_by_type(NULL, "cpu");
649
650 /*
651 * We're assuming *all* of the CPUs have the same
652 * d-cache and i-cache sizes... -Peter
653 */
654 if (cpu) {
655 if (!parse_cache_info(cpu, false, &ppc64_caches.l1d))
656 pr_warn("Argh, can't find dcache properties !\n");
657
658 if (!parse_cache_info(cpu, true, &ppc64_caches.l1i))
659 pr_warn("Argh, can't find icache properties !\n");
660
661 /*
662 * Try to find the L2 and L3 if any. Assume they are
663 * unified and use the D-side properties.
664 */
665 l2 = of_find_next_cache_node(cpu);
666 of_node_put(cpu);
667 if (l2) {
668 parse_cache_info(l2, false, &ppc64_caches.l2);
669 l3 = of_find_next_cache_node(l2);
670 of_node_put(l2);
671 }
672 if (l3) {
673 parse_cache_info(l3, false, &ppc64_caches.l3);
674 of_node_put(l3);
675 }
676 }
677
678 /* For use by binfmt_elf */
679 dcache_bsize = ppc64_caches.l1d.block_size;
680 icache_bsize = ppc64_caches.l1i.block_size;
681
682 cur_cpu_spec->dcache_bsize = dcache_bsize;
683 cur_cpu_spec->icache_bsize = icache_bsize;
684}
685
686/*
687 * This returns the limit below which memory accesses to the linear
688 * mapping are guarnateed not to cause an architectural exception (e.g.,
689 * TLB or SLB miss fault).
690 *
691 * This is used to allocate PACAs and various interrupt stacks that
692 * that are accessed early in interrupt handlers that must not cause
693 * re-entrant interrupts.
694 */
695__init u64 ppc64_bolted_size(void)
696{
697#ifdef CONFIG_PPC_BOOK3E_64
698 /* Freescale BookE bolts the entire linear mapping */
699 /* XXX: BookE ppc64_rma_limit setup seems to disagree? */
700 if (early_mmu_has_feature(MMU_FTR_TYPE_FSL_E))
701 return linear_map_top;
702 /* Other BookE, we assume the first GB is bolted */
703 return 1ul << 30;
704#else
705 /* BookS radix, does not take faults on linear mapping */
706 if (early_radix_enabled())
707 return ULONG_MAX;
708
709 /* BookS hash, the first segment is bolted */
710 if (early_mmu_has_feature(MMU_FTR_1T_SEGMENT))
711 return 1UL << SID_SHIFT_1T;
712 return 1UL << SID_SHIFT;
713#endif
714}
715
716static void *__init alloc_stack(unsigned long limit, int cpu)
717{
718 void *ptr;
719
720 BUILD_BUG_ON(STACK_INT_FRAME_SIZE % 16);
721
722 ptr = memblock_alloc_try_nid(THREAD_SIZE, THREAD_ALIGN,
723 MEMBLOCK_LOW_LIMIT, limit,
724 early_cpu_to_node(cpu));
725 if (!ptr)
726 panic("cannot allocate stacks");
727
728 return ptr;
729}
730
731void __init irqstack_early_init(void)
732{
733 u64 limit = ppc64_bolted_size();
734 unsigned int i;
735
736 /*
737 * Interrupt stacks must be in the first segment since we
738 * cannot afford to take SLB misses on them. They are not
739 * accessed in realmode.
740 */
741 for_each_possible_cpu(i) {
742 softirq_ctx[i] = alloc_stack(limit, i);
743 hardirq_ctx[i] = alloc_stack(limit, i);
744 }
745}
746
747#ifdef CONFIG_PPC_BOOK3E_64
748void __init exc_lvl_early_init(void)
749{
750 unsigned int i;
751
752 for_each_possible_cpu(i) {
753 void *sp;
754
755 sp = alloc_stack(ULONG_MAX, i);
756 critirq_ctx[i] = sp;
757 paca_ptrs[i]->crit_kstack = sp + THREAD_SIZE;
758
759 sp = alloc_stack(ULONG_MAX, i);
760 dbgirq_ctx[i] = sp;
761 paca_ptrs[i]->dbg_kstack = sp + THREAD_SIZE;
762
763 sp = alloc_stack(ULONG_MAX, i);
764 mcheckirq_ctx[i] = sp;
765 paca_ptrs[i]->mc_kstack = sp + THREAD_SIZE;
766 }
767
768 if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC))
769 patch_exception(0x040, exc_debug_debug_book3e);
770}
771#endif
772
773/*
774 * Stack space used when we detect a bad kernel stack pointer, and
775 * early in SMP boots before relocation is enabled. Exclusive emergency
776 * stack for machine checks.
777 */
778void __init emergency_stack_init(void)
779{
780 u64 limit, mce_limit;
781 unsigned int i;
782
783 /*
784 * Emergency stacks must be under 256MB, we cannot afford to take
785 * SLB misses on them. The ABI also requires them to be 128-byte
786 * aligned.
787 *
788 * Since we use these as temporary stacks during secondary CPU
789 * bringup, machine check, system reset, and HMI, we need to get
790 * at them in real mode. This means they must also be within the RMO
791 * region.
792 *
793 * The IRQ stacks allocated elsewhere in this file are zeroed and
794 * initialized in kernel/irq.c. These are initialized here in order
795 * to have emergency stacks available as early as possible.
796 */
797 limit = mce_limit = min(ppc64_bolted_size(), ppc64_rma_size);
798
799 /*
800 * Machine check on pseries calls rtas, but can't use the static
801 * rtas_args due to a machine check hitting while the lock is held.
802 * rtas args have to be under 4GB, so the machine check stack is
803 * limited to 4GB so args can be put on stack.
804 */
805 if (firmware_has_feature(FW_FEATURE_LPAR) && mce_limit > SZ_4G)
806 mce_limit = SZ_4G;
807
808 for_each_possible_cpu(i) {
809 paca_ptrs[i]->emergency_sp = alloc_stack(limit, i) + THREAD_SIZE;
810
811#ifdef CONFIG_PPC_BOOK3S_64
812 /* emergency stack for NMI exception handling. */
813 paca_ptrs[i]->nmi_emergency_sp = alloc_stack(limit, i) + THREAD_SIZE;
814
815 /* emergency stack for machine check exception handling. */
816 paca_ptrs[i]->mc_emergency_sp = alloc_stack(mce_limit, i) + THREAD_SIZE;
817#endif
818 }
819}
820
821#ifdef CONFIG_SMP
822static int pcpu_cpu_distance(unsigned int from, unsigned int to)
823{
824 if (early_cpu_to_node(from) == early_cpu_to_node(to))
825 return LOCAL_DISTANCE;
826 else
827 return REMOTE_DISTANCE;
828}
829
830static __init int pcpu_cpu_to_node(int cpu)
831{
832 return early_cpu_to_node(cpu);
833}
834
835unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
836EXPORT_SYMBOL(__per_cpu_offset);
837
838void __init setup_per_cpu_areas(void)
839{
840 const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
841 size_t atom_size;
842 unsigned long delta;
843 unsigned int cpu;
844 int rc = -EINVAL;
845
846 /*
847 * BookE and BookS radix are historical values and should be revisited.
848 */
849 if (IS_ENABLED(CONFIG_PPC_BOOK3E_64)) {
850 atom_size = SZ_1M;
851 } else if (radix_enabled()) {
852 atom_size = PAGE_SIZE;
853 } else if (IS_ENABLED(CONFIG_PPC_64S_HASH_MMU)) {
854 /*
855 * Linear mapping is one of 4K, 1M and 16M. For 4K, no need
856 * to group units. For larger mappings, use 1M atom which
857 * should be large enough to contain a number of units.
858 */
859 if (mmu_linear_psize == MMU_PAGE_4K)
860 atom_size = PAGE_SIZE;
861 else
862 atom_size = SZ_1M;
863 }
864
865 if (pcpu_chosen_fc != PCPU_FC_PAGE) {
866 rc = pcpu_embed_first_chunk(0, dyn_size, atom_size, pcpu_cpu_distance,
867 pcpu_cpu_to_node);
868 if (rc)
869 pr_warn("PERCPU: %s allocator failed (%d), "
870 "falling back to page size\n",
871 pcpu_fc_names[pcpu_chosen_fc], rc);
872 }
873
874 if (rc < 0)
875 rc = pcpu_page_first_chunk(0, pcpu_cpu_to_node);
876 if (rc < 0)
877 panic("cannot initialize percpu area (err=%d)", rc);
878
879 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
880 for_each_possible_cpu(cpu) {
881 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
882 paca_ptrs[cpu]->data_offset = __per_cpu_offset[cpu];
883 }
884}
885#endif
886
887#ifdef CONFIG_MEMORY_HOTPLUG
888unsigned long memory_block_size_bytes(void)
889{
890 if (ppc_md.memory_block_size)
891 return ppc_md.memory_block_size();
892
893 return MIN_MEMORY_BLOCK_SIZE;
894}
895#endif
896
897#if defined(CONFIG_PPC_INDIRECT_PIO) || defined(CONFIG_PPC_INDIRECT_MMIO)
898struct ppc_pci_io ppc_pci_io;
899EXPORT_SYMBOL(ppc_pci_io);
900#endif
901
902#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
903u64 hw_nmi_get_sample_period(int watchdog_thresh)
904{
905 return ppc_proc_freq * watchdog_thresh;
906}
907#endif
908
909/*
910 * The perf based hardlockup detector breaks PMU event based branches, so
911 * disable it by default. Book3S has a soft-nmi hardlockup detector based
912 * on the decrementer interrupt, so it does not suffer from this problem.
913 *
914 * It is likely to get false positives in KVM guests, so disable it there
915 * by default too. PowerVM will not stop or arbitrarily oversubscribe
916 * CPUs, but give a minimum regular allotment even with SPLPAR, so enable
917 * the detector for non-KVM guests, assume PowerVM.
918 */
919static int __init disable_hardlockup_detector(void)
920{
921#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
922 hardlockup_detector_disable();
923#else
924 if (firmware_has_feature(FW_FEATURE_LPAR)) {
925 if (is_kvm_guest())
926 hardlockup_detector_disable();
927 }
928#endif
929
930 return 0;
931}
932early_initcall(disable_hardlockup_detector);