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