1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * 64-bit pSeries and RS/6000 setup code.
4 *
5 * Copyright (C) 1995 Linus Torvalds
6 * Adapted from 'alpha' version by Gary Thomas
7 * Modified by Cort Dougan (cort@cs.nmt.edu)
8 * Modified by PPC64 Team, IBM Corp
9 */
10
11 /*
12 * bootup setup stuff..
13 */
14
15 #include <linux/cpu.h>
16 #include <linux/errno.h>
17 #include <linux/platform_device.h>
18 #include <linux/sched.h>
19 #include <linux/kernel.h>
20 #include <linux/mm.h>
21 #include <linux/stddef.h>
22 #include <linux/unistd.h>
23 #include <linux/user.h>
24 #include <linux/tty.h>
25 #include <linux/major.h>
26 #include <linux/interrupt.h>
27 #include <linux/reboot.h>
28 #include <linux/init.h>
29 #include <linux/ioport.h>
30 #include <linux/console.h>
31 #include <linux/pci.h>
32 #include <linux/utsname.h>
33 #include <linux/adb.h>
34 #include <linux/export.h>
35 #include <linux/delay.h>
36 #include <linux/irq.h>
37 #include <linux/seq_file.h>
38 #include <linux/root_dev.h>
39 #include <linux/of.h>
40 #include <linux/of_irq.h>
41 #include <linux/of_pci.h>
42 #include <linux/memblock.h>
43 #include <linux/swiotlb.h>
44 #include <linux/seq_buf.h>
45 #include <linux/sched/cputime.h>
46
47 #include <asm/mmu.h>
48 #include <asm/processor.h>
49 #include <asm/io.h>
50 #include <asm/rtas.h>
51 #include <asm/pci-bridge.h>
52 #include <asm/iommu.h>
53 #include <asm/dma.h>
54 #include <asm/machdep.h>
55 #include <asm/irq.h>
56 #include <asm/time.h>
57 #include <asm/nvram.h>
58 #include <asm/pmc.h>
59 #include <asm/xics.h>
60 #include <asm/xive.h>
61 #include <asm/papr-sysparm.h>
62 #include <asm/ppc-pci.h>
63 #include <asm/i8259.h>
64 #include <asm/udbg.h>
65 #include <asm/smp.h>
66 #include <asm/firmware.h>
67 #include <asm/eeh.h>
68 #include <asm/reg.h>
69 #include <asm/plpar_wrappers.h>
70 #include <asm/kexec.h>
71 #include <asm/isa-bridge.h>
72 #include <asm/security_features.h>
73 #include <asm/asm-const.h>
74 #include <asm/idle.h>
75 #include <asm/swiotlb.h>
76 #include <asm/svm.h>
77 #include <asm/dtl.h>
78 #include <asm/hvconsole.h>
79 #include <asm/setup.h>
80 #include <asm/papr-watchdog.h>
81
82 #include "pseries.h"
83
84 DEFINE_STATIC_KEY_FALSE(shared_processor);
85 EXPORT_SYMBOL(shared_processor);
86
87 #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
88 static bool steal_acc = true;
parse_no_stealacc(char * arg)89 static int __init parse_no_stealacc(char *arg)
90 {
91 steal_acc = false;
92 return 0;
93 }
94
95 early_param("no-steal-acc", parse_no_stealacc);
96 #endif
97
98 int CMO_PrPSP = -1;
99 int CMO_SecPSP = -1;
100 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K);
101 EXPORT_SYMBOL(CMO_PageSize);
102
103 int fwnmi_active; /* TRUE if an FWNMI handler is present */
104 int ibm_nmi_interlock_token;
105 u32 pseries_security_flavor;
106
pSeries_show_cpuinfo(struct seq_file * m)107 static void pSeries_show_cpuinfo(struct seq_file *m)
108 {
109 struct device_node *root;
110 const char *model = "";
111
112 root = of_find_node_by_path("/");
113 if (root)
114 model = of_get_property(root, "model", NULL);
115 seq_printf(m, "machine\t\t: CHRP %s\n", model);
116 of_node_put(root);
117 if (radix_enabled())
118 seq_printf(m, "MMU\t\t: Radix\n");
119 else
120 seq_printf(m, "MMU\t\t: Hash\n");
121 }
122
123 /* Initialize firmware assisted non-maskable interrupts if
124 * the firmware supports this feature.
125 */
fwnmi_init(void)126 static void __init fwnmi_init(void)
127 {
128 unsigned long system_reset_addr, machine_check_addr;
129 u8 *mce_data_buf;
130 unsigned int i;
131 int nr_cpus = num_possible_cpus();
132 #ifdef CONFIG_PPC_64S_HASH_MMU
133 struct slb_entry *slb_ptr;
134 size_t size;
135 #endif
136 int ibm_nmi_register_token;
137
138 ibm_nmi_register_token = rtas_function_token(RTAS_FN_IBM_NMI_REGISTER);
139 if (ibm_nmi_register_token == RTAS_UNKNOWN_SERVICE)
140 return;
141
142 ibm_nmi_interlock_token = rtas_function_token(RTAS_FN_IBM_NMI_INTERLOCK);
143 if (WARN_ON(ibm_nmi_interlock_token == RTAS_UNKNOWN_SERVICE))
144 return;
145
146 /* If the kernel's not linked at zero we point the firmware at low
147 * addresses anyway, and use a trampoline to get to the real code. */
148 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
149 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
150
151 if (0 == rtas_call(ibm_nmi_register_token, 2, 1, NULL,
152 system_reset_addr, machine_check_addr))
153 fwnmi_active = 1;
154
155 /*
156 * Allocate a chunk for per cpu buffer to hold rtas errorlog.
157 * It will be used in real mode mce handler, hence it needs to be
158 * below RMA.
159 */
160 mce_data_buf = memblock_alloc_try_nid_raw(RTAS_ERROR_LOG_MAX * nr_cpus,
161 RTAS_ERROR_LOG_MAX, MEMBLOCK_LOW_LIMIT,
162 ppc64_rma_size, NUMA_NO_NODE);
163 if (!mce_data_buf)
164 panic("Failed to allocate %d bytes below %pa for MCE buffer\n",
165 RTAS_ERROR_LOG_MAX * nr_cpus, &ppc64_rma_size);
166
167 for_each_possible_cpu(i) {
168 paca_ptrs[i]->mce_data_buf = mce_data_buf +
169 (RTAS_ERROR_LOG_MAX * i);
170 }
171
172 #ifdef CONFIG_PPC_64S_HASH_MMU
173 if (!radix_enabled()) {
174 /* Allocate per cpu area to save old slb contents during MCE */
175 size = sizeof(struct slb_entry) * mmu_slb_size * nr_cpus;
176 slb_ptr = memblock_alloc_try_nid_raw(size,
177 sizeof(struct slb_entry), MEMBLOCK_LOW_LIMIT,
178 ppc64_rma_size, NUMA_NO_NODE);
179 if (!slb_ptr)
180 panic("Failed to allocate %zu bytes below %pa for slb area\n",
181 size, &ppc64_rma_size);
182
183 for_each_possible_cpu(i)
184 paca_ptrs[i]->mce_faulty_slbs = slb_ptr + (mmu_slb_size * i);
185 }
186 #endif
187 }
188
pseries_crash_stop_watchdogs(void)189 static void pseries_crash_stop_watchdogs(void)
190 {
191 long rc;
192
193 rc = plpar_hcall_norets_notrace(H_WATCHDOG, PSERIES_WDTF_OP_STOP,
194 PSERIES_WDT_NUM_ALL);
195 if (rc != H_SUCCESS && rc != H_NOOP)
196 pr_warn("Could not stop watchdogs before kdump rc=%ld\n", rc);
197 }
198
199 /*
200 * Affix a device for the first timer to the platform bus if
201 * we have firmware support for the H_WATCHDOG hypercall.
202 */
pseries_wdt_init(void)203 static __init int pseries_wdt_init(void)
204 {
205 struct platform_device *pdev;
206
207 if (!firmware_has_feature(FW_FEATURE_WATCHDOG))
208 return 0;
209
210 pdev = platform_device_register_simple("pseries-wdt", 0, NULL, 0);
211
212 if (IS_ERR(pdev)) {
213 pr_err("Failed to register pseries-wdt platform device\n");
214 return PTR_ERR(pdev);
215 }
216
217 if (crash_shutdown_register(pseries_crash_stop_watchdogs))
218 pr_warn("Could not register watchdog crash shutdown handler\n");
219
220 return 0;
221 }
222 machine_subsys_initcall(pseries, pseries_wdt_init);
223
pseries_8259_cascade(struct irq_desc * desc)224 static void pseries_8259_cascade(struct irq_desc *desc)
225 {
226 struct irq_chip *chip = irq_desc_get_chip(desc);
227 unsigned int cascade_irq = i8259_irq();
228
229 if (cascade_irq)
230 generic_handle_irq(cascade_irq);
231
232 chip->irq_eoi(&desc->irq_data);
233 }
234
pseries_setup_i8259_cascade(void)235 static void __init pseries_setup_i8259_cascade(void)
236 {
237 struct device_node *np, *old, *found = NULL;
238 unsigned int cascade;
239 const u32 *addrp;
240 unsigned long intack = 0;
241 int naddr;
242
243 for_each_node_by_type(np, "interrupt-controller") {
244 if (of_device_is_compatible(np, "chrp,iic")) {
245 found = np;
246 break;
247 }
248 }
249
250 if (found == NULL) {
251 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
252 return;
253 }
254
255 cascade = irq_of_parse_and_map(found, 0);
256 if (!cascade) {
257 printk(KERN_ERR "pic: failed to map cascade interrupt");
258 return;
259 }
260 pr_debug("pic: cascade mapped to irq %d\n", cascade);
261
262 for (old = of_node_get(found); old != NULL ; old = np) {
263 np = of_get_parent(old);
264 of_node_put(old);
265 if (np == NULL)
266 break;
267 if (!of_node_name_eq(np, "pci"))
268 continue;
269 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
270 if (addrp == NULL)
271 continue;
272 naddr = of_n_addr_cells(np);
273 intack = addrp[naddr-1];
274 if (naddr > 1)
275 intack |= ((unsigned long)addrp[naddr-2]) << 32;
276 }
277 if (intack)
278 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
279 i8259_init(found, intack);
280 of_node_put(found);
281 irq_set_chained_handler(cascade, pseries_8259_cascade);
282 }
283
pseries_init_irq(void)284 static void __init pseries_init_irq(void)
285 {
286 /* Try using a XIVE if available, otherwise use a XICS */
287 if (!xive_spapr_init()) {
288 xics_init();
289 pseries_setup_i8259_cascade();
290 }
291 }
292
pseries_lpar_enable_pmcs(void)293 static void pseries_lpar_enable_pmcs(void)
294 {
295 unsigned long set, reset;
296
297 set = 1UL << 63;
298 reset = 0;
299 plpar_hcall_norets(H_PERFMON, set, reset);
300 }
301
pci_dn_reconfig_notifier(struct notifier_block * nb,unsigned long action,void * data)302 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *data)
303 {
304 struct of_reconfig_data *rd = data;
305 struct device_node *parent, *np = rd->dn;
306 struct pci_dn *pdn;
307 int err = NOTIFY_OK;
308
309 switch (action) {
310 case OF_RECONFIG_ATTACH_NODE:
311 parent = of_get_parent(np);
312 pdn = parent ? PCI_DN(parent) : NULL;
313 if (pdn)
314 pci_add_device_node_info(pdn->phb, np);
315
316 of_node_put(parent);
317 break;
318 case OF_RECONFIG_DETACH_NODE:
319 pdn = PCI_DN(np);
320 if (pdn)
321 list_del(&pdn->list);
322 break;
323 default:
324 err = NOTIFY_DONE;
325 break;
326 }
327 return err;
328 }
329
330 static struct notifier_block pci_dn_reconfig_nb = {
331 .notifier_call = pci_dn_reconfig_notifier,
332 };
333
334 struct kmem_cache *dtl_cache;
335
336 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
337 /*
338 * Allocate space for the dispatch trace log for all possible cpus
339 * and register the buffers with the hypervisor. This is used for
340 * computing time stolen by the hypervisor.
341 */
alloc_dispatch_logs(void)342 static int alloc_dispatch_logs(void)
343 {
344 if (!firmware_has_feature(FW_FEATURE_SPLPAR))
345 return 0;
346
347 if (!dtl_cache)
348 return 0;
349
350 alloc_dtl_buffers(0);
351
352 /* Register the DTL for the current (boot) cpu */
353 register_dtl_buffer(smp_processor_id());
354
355 return 0;
356 }
357 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
alloc_dispatch_logs(void)358 static inline int alloc_dispatch_logs(void)
359 {
360 return 0;
361 }
362 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
363
alloc_dispatch_log_kmem_cache(void)364 static int alloc_dispatch_log_kmem_cache(void)
365 {
366 void (*ctor)(void *) = get_dtl_cache_ctor();
367
368 dtl_cache = kmem_cache_create_usercopy("dtl", DISPATCH_LOG_BYTES,
369 DISPATCH_LOG_BYTES, 0, 0, DISPATCH_LOG_BYTES, ctor);
370 if (!dtl_cache) {
371 pr_warn("Failed to create dispatch trace log buffer cache\n");
372 pr_warn("Stolen time statistics will be unreliable\n");
373 return 0;
374 }
375
376 return alloc_dispatch_logs();
377 }
378 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache);
379
380 DEFINE_PER_CPU(u64, idle_spurr_cycles);
381 DEFINE_PER_CPU(u64, idle_entry_purr_snap);
382 DEFINE_PER_CPU(u64, idle_entry_spurr_snap);
pseries_lpar_idle(void)383 static void pseries_lpar_idle(void)
384 {
385 /*
386 * Default handler to go into low thread priority and possibly
387 * low power mode by ceding processor to hypervisor
388 */
389
390 if (!prep_irq_for_idle())
391 return;
392
393 /* Indicate to hypervisor that we are idle. */
394 pseries_idle_prolog();
395
396 /*
397 * Yield the processor to the hypervisor. We return if
398 * an external interrupt occurs (which are driven prior
399 * to returning here) or if a prod occurs from another
400 * processor. When returning here, external interrupts
401 * are enabled.
402 */
403 cede_processor();
404
405 pseries_idle_epilog();
406 }
407
408 static bool pseries_reloc_on_exception_enabled;
409
pseries_reloc_on_exception(void)410 bool pseries_reloc_on_exception(void)
411 {
412 return pseries_reloc_on_exception_enabled;
413 }
414 EXPORT_SYMBOL_GPL(pseries_reloc_on_exception);
415
416 /*
417 * Enable relocation on during exceptions. This has partition wide scope and
418 * may take a while to complete, if it takes longer than one second we will
419 * just give up rather than wasting any more time on this - if that turns out
420 * to ever be a problem in practice we can move this into a kernel thread to
421 * finish off the process later in boot.
422 */
pseries_enable_reloc_on_exc(void)423 bool pseries_enable_reloc_on_exc(void)
424 {
425 long rc;
426 unsigned int delay, total_delay = 0;
427
428 while (1) {
429 rc = enable_reloc_on_exceptions();
430 if (!H_IS_LONG_BUSY(rc)) {
431 if (rc == H_P2) {
432 pr_info("Relocation on exceptions not"
433 " supported\n");
434 return false;
435 } else if (rc != H_SUCCESS) {
436 pr_warn("Unable to enable relocation"
437 " on exceptions: %ld\n", rc);
438 return false;
439 }
440 pseries_reloc_on_exception_enabled = true;
441 return true;
442 }
443
444 delay = get_longbusy_msecs(rc);
445 total_delay += delay;
446 if (total_delay > 1000) {
447 pr_warn("Warning: Giving up waiting to enable "
448 "relocation on exceptions (%u msec)!\n",
449 total_delay);
450 return false;
451 }
452
453 mdelay(delay);
454 }
455 }
456 EXPORT_SYMBOL(pseries_enable_reloc_on_exc);
457
pseries_disable_reloc_on_exc(void)458 void pseries_disable_reloc_on_exc(void)
459 {
460 long rc;
461
462 while (1) {
463 rc = disable_reloc_on_exceptions();
464 if (!H_IS_LONG_BUSY(rc))
465 break;
466 mdelay(get_longbusy_msecs(rc));
467 }
468 if (rc == H_SUCCESS)
469 pseries_reloc_on_exception_enabled = false;
470 else
471 pr_warn("Warning: Failed to disable relocation on exceptions: %ld\n",
472 rc);
473 }
474 EXPORT_SYMBOL(pseries_disable_reloc_on_exc);
475
476 #ifdef __LITTLE_ENDIAN__
pseries_big_endian_exceptions(void)477 void pseries_big_endian_exceptions(void)
478 {
479 long rc;
480
481 while (1) {
482 rc = enable_big_endian_exceptions();
483 if (!H_IS_LONG_BUSY(rc))
484 break;
485 mdelay(get_longbusy_msecs(rc));
486 }
487
488 /*
489 * At this point it is unlikely panic() will get anything
490 * out to the user, since this is called very late in kexec
491 * but at least this will stop us from continuing on further
492 * and creating an even more difficult to debug situation.
493 *
494 * There is a known problem when kdump'ing, if cpus are offline
495 * the above call will fail. Rather than panicking again, keep
496 * going and hope the kdump kernel is also little endian, which
497 * it usually is.
498 */
499 if (rc && !kdump_in_progress())
500 panic("Could not enable big endian exceptions");
501 }
502
pseries_little_endian_exceptions(void)503 void __init pseries_little_endian_exceptions(void)
504 {
505 long rc;
506
507 while (1) {
508 rc = enable_little_endian_exceptions();
509 if (!H_IS_LONG_BUSY(rc))
510 break;
511 mdelay(get_longbusy_msecs(rc));
512 }
513 if (rc) {
514 ppc_md.progress("H_SET_MODE LE exception fail", 0);
515 panic("Could not enable little endian exceptions");
516 }
517 }
518 #endif
519
pSeries_discover_phbs(void)520 static void __init pSeries_discover_phbs(void)
521 {
522 struct device_node *node;
523 struct pci_controller *phb;
524 struct device_node *root = of_find_node_by_path("/");
525
526 for_each_child_of_node(root, node) {
527 if (!of_node_is_type(node, "pci") &&
528 !of_node_is_type(node, "pciex"))
529 continue;
530
531 phb = pcibios_alloc_controller(node);
532 if (!phb)
533 continue;
534 rtas_setup_phb(phb);
535 pci_process_bridge_OF_ranges(phb, node, 0);
536 isa_bridge_find_early(phb);
537 phb->controller_ops = pseries_pci_controller_ops;
538
539 /* create pci_dn's for DT nodes under this PHB */
540 pci_devs_phb_init_dynamic(phb);
541
542 pseries_msi_allocate_domains(phb);
543 }
544
545 of_node_put(root);
546
547 /*
548 * PCI_PROBE_ONLY and PCI_REASSIGN_ALL_BUS can be set via properties
549 * in chosen.
550 */
551 of_pci_check_probe_only();
552 }
553
init_cpu_char_feature_flags(struct h_cpu_char_result * result)554 static void init_cpu_char_feature_flags(struct h_cpu_char_result *result)
555 {
556 /*
557 * The features below are disabled by default, so we instead look to see
558 * if firmware has *enabled* them, and set them if so.
559 */
560 if (result->character & H_CPU_CHAR_SPEC_BAR_ORI31)
561 security_ftr_set(SEC_FTR_SPEC_BAR_ORI31);
562
563 if (result->character & H_CPU_CHAR_BCCTRL_SERIALISED)
564 security_ftr_set(SEC_FTR_BCCTRL_SERIALISED);
565
566 if (result->character & H_CPU_CHAR_L1D_FLUSH_ORI30)
567 security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30);
568
569 if (result->character & H_CPU_CHAR_L1D_FLUSH_TRIG2)
570 security_ftr_set(SEC_FTR_L1D_FLUSH_TRIG2);
571
572 if (result->character & H_CPU_CHAR_L1D_THREAD_PRIV)
573 security_ftr_set(SEC_FTR_L1D_THREAD_PRIV);
574
575 if (result->character & H_CPU_CHAR_COUNT_CACHE_DISABLED)
576 security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED);
577
578 if (result->character & H_CPU_CHAR_BCCTR_FLUSH_ASSIST)
579 security_ftr_set(SEC_FTR_BCCTR_FLUSH_ASSIST);
580
581 if (result->character & H_CPU_CHAR_BCCTR_LINK_FLUSH_ASSIST)
582 security_ftr_set(SEC_FTR_BCCTR_LINK_FLUSH_ASSIST);
583
584 if (result->behaviour & H_CPU_BEHAV_FLUSH_COUNT_CACHE)
585 security_ftr_set(SEC_FTR_FLUSH_COUNT_CACHE);
586
587 if (result->behaviour & H_CPU_BEHAV_FLUSH_LINK_STACK)
588 security_ftr_set(SEC_FTR_FLUSH_LINK_STACK);
589
590 /*
591 * The features below are enabled by default, so we instead look to see
592 * if firmware has *disabled* them, and clear them if so.
593 * H_CPU_BEHAV_FAVOUR_SECURITY_H could be set only if
594 * H_CPU_BEHAV_FAVOUR_SECURITY is.
595 */
596 if (!(result->behaviour & H_CPU_BEHAV_FAVOUR_SECURITY)) {
597 security_ftr_clear(SEC_FTR_FAVOUR_SECURITY);
598 pseries_security_flavor = 0;
599 } else if (result->behaviour & H_CPU_BEHAV_FAVOUR_SECURITY_H)
600 pseries_security_flavor = 1;
601 else
602 pseries_security_flavor = 2;
603
604 if (!(result->behaviour & H_CPU_BEHAV_L1D_FLUSH_PR))
605 security_ftr_clear(SEC_FTR_L1D_FLUSH_PR);
606
607 if (result->behaviour & H_CPU_BEHAV_NO_L1D_FLUSH_ENTRY)
608 security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY);
609
610 if (result->behaviour & H_CPU_BEHAV_NO_L1D_FLUSH_UACCESS)
611 security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS);
612
613 if (result->behaviour & H_CPU_BEHAV_NO_STF_BARRIER)
614 security_ftr_clear(SEC_FTR_STF_BARRIER);
615
616 if (!(result->behaviour & H_CPU_BEHAV_BNDS_CHK_SPEC_BAR))
617 security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);
618 }
619
pseries_setup_security_mitigations(void)620 void pseries_setup_security_mitigations(void)
621 {
622 struct h_cpu_char_result result;
623 enum l1d_flush_type types;
624 bool enable;
625 long rc;
626
627 /*
628 * Set features to the defaults assumed by init_cpu_char_feature_flags()
629 * so it can set/clear again any features that might have changed after
630 * migration, and in case the hypercall fails and it is not even called.
631 */
632 powerpc_security_features = SEC_FTR_DEFAULT;
633
634 rc = plpar_get_cpu_characteristics(&result);
635 if (rc == H_SUCCESS)
636 init_cpu_char_feature_flags(&result);
637
638 /*
639 * We're the guest so this doesn't apply to us, clear it to simplify
640 * handling of it elsewhere.
641 */
642 security_ftr_clear(SEC_FTR_L1D_FLUSH_HV);
643
644 types = L1D_FLUSH_FALLBACK;
645
646 if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_TRIG2))
647 types |= L1D_FLUSH_MTTRIG;
648
649 if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_ORI30))
650 types |= L1D_FLUSH_ORI;
651
652 enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \
653 security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR);
654
655 setup_rfi_flush(types, enable);
656 setup_count_cache_flush();
657
658 enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
659 security_ftr_enabled(SEC_FTR_L1D_FLUSH_ENTRY);
660 setup_entry_flush(enable);
661
662 enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
663 security_ftr_enabled(SEC_FTR_L1D_FLUSH_UACCESS);
664 setup_uaccess_flush(enable);
665
666 setup_stf_barrier();
667 }
668
669 #ifdef CONFIG_PCI_IOV
670 enum rtas_iov_fw_value_map {
671 NUM_RES_PROPERTY = 0, /* Number of Resources */
672 LOW_INT = 1, /* Lowest 32 bits of Address */
673 START_OF_ENTRIES = 2, /* Always start of entry */
674 APERTURE_PROPERTY = 2, /* Start of entry+ to Aperture Size */
675 WDW_SIZE_PROPERTY = 4, /* Start of entry+ to Window Size */
676 NEXT_ENTRY = 7 /* Go to next entry on array */
677 };
678
679 enum get_iov_fw_value_index {
680 BAR_ADDRS = 1, /* Get Bar Address */
681 APERTURE_SIZE = 2, /* Get Aperture Size */
682 WDW_SIZE = 3 /* Get Window Size */
683 };
684
pseries_get_iov_fw_value(const struct pci_dev * dev,int resno,enum get_iov_fw_value_index value)685 static resource_size_t pseries_get_iov_fw_value(const struct pci_dev *dev,
686 int resno,
687 enum get_iov_fw_value_index value)
688 {
689 const int *indexes;
690 struct device_node *dn = pci_device_to_OF_node(dev);
691 int i, num_res, ret = 0;
692
693 indexes = of_get_property(dn, "ibm,open-sriov-vf-bar-info", NULL);
694 if (!indexes)
695 return 0;
696
697 /*
698 * First element in the array is the number of Bars
699 * returned. Search through the list to find the matching
700 * bar
701 */
702 num_res = of_read_number(&indexes[NUM_RES_PROPERTY], 1);
703 if (resno >= num_res)
704 return 0; /* or an error */
705
706 i = START_OF_ENTRIES + NEXT_ENTRY * resno;
707 switch (value) {
708 case BAR_ADDRS:
709 ret = of_read_number(&indexes[i], 2);
710 break;
711 case APERTURE_SIZE:
712 ret = of_read_number(&indexes[i + APERTURE_PROPERTY], 2);
713 break;
714 case WDW_SIZE:
715 ret = of_read_number(&indexes[i + WDW_SIZE_PROPERTY], 2);
716 break;
717 }
718
719 return ret;
720 }
721
of_pci_set_vf_bar_size(struct pci_dev * dev,const int * indexes)722 static void of_pci_set_vf_bar_size(struct pci_dev *dev, const int *indexes)
723 {
724 struct resource *res;
725 resource_size_t base, size;
726 int i, r, num_res;
727
728 num_res = of_read_number(&indexes[NUM_RES_PROPERTY], 1);
729 num_res = min_t(int, num_res, PCI_SRIOV_NUM_BARS);
730 for (i = START_OF_ENTRIES, r = 0; r < num_res && r < PCI_SRIOV_NUM_BARS;
731 i += NEXT_ENTRY, r++) {
732 res = &dev->resource[r + PCI_IOV_RESOURCES];
733 base = of_read_number(&indexes[i], 2);
734 size = of_read_number(&indexes[i + APERTURE_PROPERTY], 2);
735 res->flags = pci_parse_of_flags(of_read_number
736 (&indexes[i + LOW_INT], 1), 0);
737 res->flags |= (IORESOURCE_MEM_64 | IORESOURCE_PCI_FIXED);
738 res->name = pci_name(dev);
739 res->start = base;
740 res->end = base + size - 1;
741 }
742 }
743
of_pci_parse_iov_addrs(struct pci_dev * dev,const int * indexes)744 static void of_pci_parse_iov_addrs(struct pci_dev *dev, const int *indexes)
745 {
746 struct resource *res, *root, *conflict;
747 resource_size_t base, size;
748 int i, r, num_res;
749
750 /*
751 * First element in the array is the number of Bars
752 * returned. Search through the list to find the matching
753 * bars assign them from firmware into resources structure.
754 */
755 num_res = of_read_number(&indexes[NUM_RES_PROPERTY], 1);
756 for (i = START_OF_ENTRIES, r = 0; r < num_res && r < PCI_SRIOV_NUM_BARS;
757 i += NEXT_ENTRY, r++) {
758 res = &dev->resource[r + PCI_IOV_RESOURCES];
759 base = of_read_number(&indexes[i], 2);
760 size = of_read_number(&indexes[i + WDW_SIZE_PROPERTY], 2);
761 res->name = pci_name(dev);
762 res->start = base;
763 res->end = base + size - 1;
764 root = &iomem_resource;
765 dev_dbg(&dev->dev,
766 "pSeries IOV BAR %d: trying firmware assignment %pR\n",
767 r + PCI_IOV_RESOURCES, res);
768 conflict = request_resource_conflict(root, res);
769 if (conflict) {
770 dev_info(&dev->dev,
771 "BAR %d: %pR conflicts with %s %pR\n",
772 r + PCI_IOV_RESOURCES, res,
773 conflict->name, conflict);
774 res->flags |= IORESOURCE_UNSET;
775 }
776 }
777 }
778
pseries_disable_sriov_resources(struct pci_dev * pdev)779 static void pseries_disable_sriov_resources(struct pci_dev *pdev)
780 {
781 int i;
782
783 pci_warn(pdev, "No hypervisor support for SR-IOV on this device, IOV BARs disabled.\n");
784 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++)
785 pdev->resource[i + PCI_IOV_RESOURCES].flags = 0;
786 }
787
pseries_pci_fixup_resources(struct pci_dev * pdev)788 static void pseries_pci_fixup_resources(struct pci_dev *pdev)
789 {
790 const int *indexes;
791 struct device_node *dn = pci_device_to_OF_node(pdev);
792
793 /*Firmware must support open sriov otherwise dont configure*/
794 indexes = of_get_property(dn, "ibm,open-sriov-vf-bar-info", NULL);
795 if (indexes)
796 of_pci_set_vf_bar_size(pdev, indexes);
797 else
798 pseries_disable_sriov_resources(pdev);
799 }
800
pseries_pci_fixup_iov_resources(struct pci_dev * pdev)801 static void pseries_pci_fixup_iov_resources(struct pci_dev *pdev)
802 {
803 const int *indexes;
804 struct device_node *dn = pci_device_to_OF_node(pdev);
805
806 if (!pdev->is_physfn)
807 return;
808 /*Firmware must support open sriov otherwise don't configure*/
809 indexes = of_get_property(dn, "ibm,open-sriov-vf-bar-info", NULL);
810 if (indexes)
811 of_pci_parse_iov_addrs(pdev, indexes);
812 else
813 pseries_disable_sriov_resources(pdev);
814 }
815
pseries_pci_iov_resource_alignment(const struct pci_dev * pdev,int resno)816 static resource_size_t pseries_pci_iov_resource_alignment(const struct pci_dev *pdev,
817 int resno)
818 {
819 const __be32 *reg;
820 struct device_node *dn = pci_device_to_OF_node(pdev);
821
822 /*Firmware must support open sriov otherwise report regular alignment*/
823 reg = of_get_property(dn, "ibm,is-open-sriov-pf", NULL);
824 if (!reg)
825 return pci_iov_resource_size(pdev, resno);
826
827 if (!pdev->is_physfn)
828 return 0;
829 return pseries_get_iov_fw_value(pdev,
830 resno - PCI_IOV_RESOURCES,
831 APERTURE_SIZE);
832 }
833 #endif
834
pSeries_setup_arch(void)835 static void __init pSeries_setup_arch(void)
836 {
837 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
838
839 /* Discover PIC type and setup ppc_md accordingly */
840 smp_init_pseries();
841
842 // Setup CPU hotplug callbacks
843 pseries_cpu_hotplug_init();
844
845 if (radix_enabled() && !mmu_has_feature(MMU_FTR_GTSE))
846 if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE))
847 panic("BUG: Radix support requires either GTSE or RPT_INVALIDATE\n");
848
849
850 /* openpic global configuration register (64-bit format). */
851 /* openpic Interrupt Source Unit pointer (64-bit format). */
852 /* python0 facility area (mmio) (64-bit format) REAL address. */
853
854 /* init to some ~sane value until calibrate_delay() runs */
855 loops_per_jiffy = 50000000;
856
857 fwnmi_init();
858
859 pseries_setup_security_mitigations();
860 if (!radix_enabled())
861 pseries_lpar_read_hblkrm_characteristics();
862
863 /* By default, only probe PCI (can be overridden by rtas_pci) */
864 pci_add_flags(PCI_PROBE_ONLY);
865
866 /* Find and initialize PCI host bridges */
867 init_pci_config_tokens();
868 of_reconfig_notifier_register(&pci_dn_reconfig_nb);
869
870 pSeries_nvram_init();
871
872 if (firmware_has_feature(FW_FEATURE_LPAR)) {
873 vpa_init(boot_cpuid);
874
875 if (lppaca_shared_proc()) {
876 static_branch_enable(&shared_processor);
877 pv_spinlocks_init();
878 #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
879 static_key_slow_inc(¶virt_steal_enabled);
880 if (steal_acc)
881 static_key_slow_inc(¶virt_steal_rq_enabled);
882 #endif
883 }
884
885 ppc_md.power_save = pseries_lpar_idle;
886 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
887 #ifdef CONFIG_PCI_IOV
888 ppc_md.pcibios_fixup_resources =
889 pseries_pci_fixup_resources;
890 ppc_md.pcibios_fixup_sriov =
891 pseries_pci_fixup_iov_resources;
892 ppc_md.pcibios_iov_resource_alignment =
893 pseries_pci_iov_resource_alignment;
894 #endif
895 } else {
896 /* No special idle routine */
897 ppc_md.enable_pmcs = power4_enable_pmcs;
898 }
899
900 ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
901 pseries_rng_init();
902 }
903
pseries_panic(char * str)904 static void pseries_panic(char *str)
905 {
906 panic_flush_kmsg_end();
907 rtas_os_term(str);
908 }
909
pSeries_init_panel(void)910 static int __init pSeries_init_panel(void)
911 {
912 /* Manually leave the kernel version on the panel. */
913 #ifdef __BIG_ENDIAN__
914 ppc_md.progress("Linux ppc64\n", 0);
915 #else
916 ppc_md.progress("Linux ppc64le\n", 0);
917 #endif
918 ppc_md.progress(init_utsname()->version, 0);
919
920 return 0;
921 }
922 machine_arch_initcall(pseries, pSeries_init_panel);
923
pseries_set_dabr(unsigned long dabr,unsigned long dabrx)924 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
925 {
926 return plpar_hcall_norets(H_SET_DABR, dabr);
927 }
928
pseries_set_xdabr(unsigned long dabr,unsigned long dabrx)929 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
930 {
931 /* Have to set at least one bit in the DABRX according to PAPR */
932 if (dabrx == 0 && dabr == 0)
933 dabrx = DABRX_USER;
934 /* PAPR says we can only set kernel and user bits */
935 dabrx &= DABRX_KERNEL | DABRX_USER;
936
937 return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
938 }
939
pseries_set_dawr(int nr,unsigned long dawr,unsigned long dawrx)940 static int pseries_set_dawr(int nr, unsigned long dawr, unsigned long dawrx)
941 {
942 /* PAPR says we can't set HYP */
943 dawrx &= ~DAWRX_HYP;
944
945 if (nr == 0)
946 return plpar_set_watchpoint0(dawr, dawrx);
947 else
948 return plpar_set_watchpoint1(dawr, dawrx);
949 }
950
951 #define CMO_CHARACTERISTICS_TOKEN 44
952 #define CMO_MAXLENGTH 1026
953
pSeries_coalesce_init(void)954 void pSeries_coalesce_init(void)
955 {
956 struct hvcall_mpp_x_data mpp_x_data;
957
958 if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
959 powerpc_firmware_features |= FW_FEATURE_XCMO;
960 else
961 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
962 }
963
964 /**
965 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
966 * handle that here. (Stolen from parse_system_parameter_string)
967 */
pSeries_cmo_feature_init(void)968 static void __init pSeries_cmo_feature_init(void)
969 {
970 static struct papr_sysparm_buf buf __initdata;
971 static_assert(sizeof(buf.val) >= CMO_MAXLENGTH);
972 char *ptr, *key, *value, *end;
973 int page_order = IOMMU_PAGE_SHIFT_4K;
974
975 pr_debug(" -> fw_cmo_feature_init()\n");
976
977 if (papr_sysparm_get(PAPR_SYSPARM_COOP_MEM_OVERCOMMIT_ATTRS, &buf)) {
978 pr_debug("CMO not available\n");
979 pr_debug(" <- fw_cmo_feature_init()\n");
980 return;
981 }
982
983 end = &buf.val[CMO_MAXLENGTH];
984 ptr = &buf.val[0];
985 key = value = ptr;
986
987 while (*ptr && (ptr <= end)) {
988 /* Separate the key and value by replacing '=' with '\0' and
989 * point the value at the string after the '='
990 */
991 if (ptr[0] == '=') {
992 ptr[0] = '\0';
993 value = ptr + 1;
994 } else if (ptr[0] == '\0' || ptr[0] == ',') {
995 /* Terminate the string containing the key/value pair */
996 ptr[0] = '\0';
997
998 if (key == value) {
999 pr_debug("Malformed key/value pair\n");
1000 /* Never found a '=', end processing */
1001 break;
1002 }
1003
1004 if (0 == strcmp(key, "CMOPageSize"))
1005 page_order = simple_strtol(value, NULL, 10);
1006 else if (0 == strcmp(key, "PrPSP"))
1007 CMO_PrPSP = simple_strtol(value, NULL, 10);
1008 else if (0 == strcmp(key, "SecPSP"))
1009 CMO_SecPSP = simple_strtol(value, NULL, 10);
1010 value = key = ptr + 1;
1011 }
1012 ptr++;
1013 }
1014
1015 /* Page size is returned as the power of 2 of the page size,
1016 * convert to the page size in bytes before returning
1017 */
1018 CMO_PageSize = 1 << page_order;
1019 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
1020
1021 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
1022 pr_info("CMO enabled\n");
1023 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
1024 CMO_SecPSP);
1025 powerpc_firmware_features |= FW_FEATURE_CMO;
1026 pSeries_coalesce_init();
1027 } else
1028 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
1029 CMO_SecPSP);
1030 pr_debug(" <- fw_cmo_feature_init()\n");
1031 }
1032
pseries_add_hw_description(void)1033 static void __init pseries_add_hw_description(void)
1034 {
1035 struct device_node *dn;
1036 const char *s;
1037
1038 dn = of_find_node_by_path("/openprom");
1039 if (dn) {
1040 if (of_property_read_string(dn, "model", &s) == 0)
1041 seq_buf_printf(&ppc_hw_desc, "of:%s ", s);
1042
1043 of_node_put(dn);
1044 }
1045
1046 dn = of_find_node_by_path("/hypervisor");
1047 if (dn) {
1048 if (of_property_read_string(dn, "compatible", &s) == 0)
1049 seq_buf_printf(&ppc_hw_desc, "hv:%s ", s);
1050
1051 of_node_put(dn);
1052 return;
1053 }
1054
1055 dn = of_find_node_by_path("/");
1056 if (of_property_read_bool(dn, "ibm,powervm-partition") ||
1057 of_property_read_bool(dn, "ibm,fw-net-version"))
1058 seq_buf_printf(&ppc_hw_desc, "hv:phyp ");
1059 of_node_put(dn);
1060 }
1061
1062 /*
1063 * Early initialization. Relocation is on but do not reference unbolted pages
1064 */
pseries_init(void)1065 static void __init pseries_init(void)
1066 {
1067 pr_debug(" -> pseries_init()\n");
1068
1069 pseries_add_hw_description();
1070
1071 #ifdef CONFIG_HVC_CONSOLE
1072 if (firmware_has_feature(FW_FEATURE_LPAR))
1073 hvc_vio_init_early();
1074 #endif
1075 if (firmware_has_feature(FW_FEATURE_XDABR))
1076 ppc_md.set_dabr = pseries_set_xdabr;
1077 else if (firmware_has_feature(FW_FEATURE_DABR))
1078 ppc_md.set_dabr = pseries_set_dabr;
1079
1080 if (firmware_has_feature(FW_FEATURE_SET_MODE))
1081 ppc_md.set_dawr = pseries_set_dawr;
1082
1083 pSeries_cmo_feature_init();
1084 iommu_init_early_pSeries();
1085
1086 pr_debug(" <- pseries_init()\n");
1087 }
1088
1089 /**
1090 * pseries_power_off - tell firmware about how to power off the system.
1091 *
1092 * This function calls either the power-off rtas token in normal cases
1093 * or the ibm,power-off-ups token (if present & requested) in case of
1094 * a power failure. If power-off token is used, power on will only be
1095 * possible with power button press. If ibm,power-off-ups token is used
1096 * it will allow auto poweron after power is restored.
1097 */
pseries_power_off(void)1098 static void pseries_power_off(void)
1099 {
1100 int rc;
1101 int rtas_poweroff_ups_token = rtas_function_token(RTAS_FN_IBM_POWER_OFF_UPS);
1102
1103 if (rtas_flash_term_hook)
1104 rtas_flash_term_hook(SYS_POWER_OFF);
1105
1106 if (rtas_poweron_auto == 0 ||
1107 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
1108 rc = rtas_call(rtas_function_token(RTAS_FN_POWER_OFF), 2, 1, NULL, -1, -1);
1109 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
1110 } else {
1111 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
1112 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
1113 }
1114 for (;;);
1115 }
1116
pSeries_probe(void)1117 static int __init pSeries_probe(void)
1118 {
1119 struct device_node *root = of_find_node_by_path("/");
1120 bool ret = of_node_is_type(root, "chrp");
1121
1122 of_node_put(root);
1123 if (!ret)
1124 return 0;
1125
1126 /* Cell blades firmware claims to be chrp while it's not. Until this
1127 * is fixed, we need to avoid those here.
1128 */
1129 if (of_machine_is_compatible("IBM,CPBW-1.0") ||
1130 of_machine_is_compatible("IBM,CBEA"))
1131 return 0;
1132
1133 pm_power_off = pseries_power_off;
1134
1135 pr_debug("Machine is%s LPAR !\n",
1136 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
1137
1138 pseries_init();
1139
1140 return 1;
1141 }
1142
pSeries_pci_probe_mode(struct pci_bus * bus)1143 static int pSeries_pci_probe_mode(struct pci_bus *bus)
1144 {
1145 if (firmware_has_feature(FW_FEATURE_LPAR))
1146 return PCI_PROBE_DEVTREE;
1147 return PCI_PROBE_NORMAL;
1148 }
1149
1150 #ifdef CONFIG_MEMORY_HOTPLUG
pseries_memory_block_size(void)1151 static unsigned long pseries_memory_block_size(void)
1152 {
1153 return memory_block_size;
1154 }
1155 #endif
1156
1157 struct pci_controller_ops pseries_pci_controller_ops = {
1158 .probe_mode = pSeries_pci_probe_mode,
1159 #ifdef CONFIG_SPAPR_TCE_IOMMU
1160 .device_group = pSeries_pci_device_group,
1161 #endif
1162 };
1163
define_machine(pseries)1164 define_machine(pseries) {
1165 .name = "pSeries",
1166 .probe = pSeries_probe,
1167 .setup_arch = pSeries_setup_arch,
1168 .init_IRQ = pseries_init_irq,
1169 .show_cpuinfo = pSeries_show_cpuinfo,
1170 .log_error = pSeries_log_error,
1171 .discover_phbs = pSeries_discover_phbs,
1172 .pcibios_fixup = pSeries_final_fixup,
1173 .restart = rtas_restart,
1174 .halt = rtas_halt,
1175 .panic = pseries_panic,
1176 .get_boot_time = rtas_get_boot_time,
1177 .get_rtc_time = rtas_get_rtc_time,
1178 .set_rtc_time = rtas_set_rtc_time,
1179 .progress = rtas_progress,
1180 .system_reset_exception = pSeries_system_reset_exception,
1181 .machine_check_early = pseries_machine_check_realmode,
1182 .machine_check_exception = pSeries_machine_check_exception,
1183 .machine_check_log_err = pSeries_machine_check_log_err,
1184 #ifdef CONFIG_KEXEC_CORE
1185 .kexec_cpu_down = pseries_kexec_cpu_down,
1186 #endif
1187 #ifdef CONFIG_MEMORY_HOTPLUG
1188 .memory_block_size = pseries_memory_block_size,
1189 #endif
1190 };
1191