1 /*
2 * 64-bit pSeries and RS/6000 setup code.
3 *
4 * Copyright (C) 1995 Linus Torvalds
5 * Adapted from 'alpha' version by Gary Thomas
6 * Modified by Cort Dougan (cort@cs.nmt.edu)
7 * Modified by PPC64 Team, IBM Corp
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * bootup setup stuff..
17 */
18
19 #include <linux/cpu.h>
20 #include <linux/errno.h>
21 #include <linux/sched.h>
22 #include <linux/kernel.h>
23 #include <linux/mm.h>
24 #include <linux/stddef.h>
25 #include <linux/unistd.h>
26 #include <linux/user.h>
27 #include <linux/tty.h>
28 #include <linux/major.h>
29 #include <linux/interrupt.h>
30 #include <linux/reboot.h>
31 #include <linux/init.h>
32 #include <linux/ioport.h>
33 #include <linux/console.h>
34 #include <linux/pci.h>
35 #include <linux/utsname.h>
36 #include <linux/adb.h>
37 #include <linux/export.h>
38 #include <linux/delay.h>
39 #include <linux/irq.h>
40 #include <linux/seq_file.h>
41 #include <linux/root_dev.h>
42 #include <linux/of.h>
43 #include <linux/of_pci.h>
44 #include <linux/kexec.h>
45
46 #include <asm/mmu.h>
47 #include <asm/processor.h>
48 #include <asm/io.h>
49 #include <asm/pgtable.h>
50 #include <asm/prom.h>
51 #include <asm/rtas.h>
52 #include <asm/pci-bridge.h>
53 #include <asm/iommu.h>
54 #include <asm/dma.h>
55 #include <asm/machdep.h>
56 #include <asm/irq.h>
57 #include <asm/time.h>
58 #include <asm/nvram.h>
59 #include <asm/pmc.h>
60 #include <asm/mpic.h>
61 #include <asm/xics.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/security_features.h>
71
72 #include "pseries.h"
73
74 int CMO_PrPSP = -1;
75 int CMO_SecPSP = -1;
76 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K);
77 EXPORT_SYMBOL(CMO_PageSize);
78
79 int fwnmi_active; /* TRUE if an FWNMI handler is present */
80
81 static struct device_node *pSeries_mpic_node;
82
pSeries_show_cpuinfo(struct seq_file * m)83 static void pSeries_show_cpuinfo(struct seq_file *m)
84 {
85 struct device_node *root;
86 const char *model = "";
87
88 root = of_find_node_by_path("/");
89 if (root)
90 model = of_get_property(root, "model", NULL);
91 seq_printf(m, "machine\t\t: CHRP %s\n", model);
92 of_node_put(root);
93 }
94
95 /* Initialize firmware assisted non-maskable interrupts if
96 * the firmware supports this feature.
97 */
fwnmi_init(void)98 static void __init fwnmi_init(void)
99 {
100 unsigned long system_reset_addr, machine_check_addr;
101
102 int ibm_nmi_register = rtas_token("ibm,nmi-register");
103 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
104 return;
105
106 /* If the kernel's not linked at zero we point the firmware at low
107 * addresses anyway, and use a trampoline to get to the real code. */
108 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
109 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
110
111 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
112 machine_check_addr))
113 fwnmi_active = 1;
114 }
115
pseries_8259_cascade(struct irq_desc * desc)116 static void pseries_8259_cascade(struct irq_desc *desc)
117 {
118 struct irq_chip *chip = irq_desc_get_chip(desc);
119 unsigned int cascade_irq = i8259_irq();
120
121 if (cascade_irq != NO_IRQ)
122 generic_handle_irq(cascade_irq);
123
124 chip->irq_eoi(&desc->irq_data);
125 }
126
pseries_setup_i8259_cascade(void)127 static void __init pseries_setup_i8259_cascade(void)
128 {
129 struct device_node *np, *old, *found = NULL;
130 unsigned int cascade;
131 const u32 *addrp;
132 unsigned long intack = 0;
133 int naddr;
134
135 for_each_node_by_type(np, "interrupt-controller") {
136 if (of_device_is_compatible(np, "chrp,iic")) {
137 found = np;
138 break;
139 }
140 }
141
142 if (found == NULL) {
143 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
144 return;
145 }
146
147 cascade = irq_of_parse_and_map(found, 0);
148 if (cascade == NO_IRQ) {
149 printk(KERN_ERR "pic: failed to map cascade interrupt");
150 return;
151 }
152 pr_debug("pic: cascade mapped to irq %d\n", cascade);
153
154 for (old = of_node_get(found); old != NULL ; old = np) {
155 np = of_get_parent(old);
156 of_node_put(old);
157 if (np == NULL)
158 break;
159 if (strcmp(np->name, "pci") != 0)
160 continue;
161 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
162 if (addrp == NULL)
163 continue;
164 naddr = of_n_addr_cells(np);
165 intack = addrp[naddr-1];
166 if (naddr > 1)
167 intack |= ((unsigned long)addrp[naddr-2]) << 32;
168 }
169 if (intack)
170 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
171 i8259_init(found, intack);
172 of_node_put(found);
173 irq_set_chained_handler(cascade, pseries_8259_cascade);
174 }
175
pseries_mpic_init_IRQ(void)176 static void __init pseries_mpic_init_IRQ(void)
177 {
178 struct device_node *np;
179 const unsigned int *opprop;
180 unsigned long openpic_addr = 0;
181 int naddr, n, i, opplen;
182 struct mpic *mpic;
183
184 np = of_find_node_by_path("/");
185 naddr = of_n_addr_cells(np);
186 opprop = of_get_property(np, "platform-open-pic", &opplen);
187 if (opprop != NULL) {
188 openpic_addr = of_read_number(opprop, naddr);
189 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
190 }
191 of_node_put(np);
192
193 BUG_ON(openpic_addr == 0);
194
195 /* Setup the openpic driver */
196 mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
197 MPIC_NO_RESET, 16, 0, " MPIC ");
198 BUG_ON(mpic == NULL);
199
200 /* Add ISUs */
201 opplen /= sizeof(u32);
202 for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
203 unsigned long isuaddr = of_read_number(opprop + i, naddr);
204 mpic_assign_isu(mpic, n, isuaddr);
205 }
206
207 /* Setup top-level get_irq */
208 ppc_md.get_irq = mpic_get_irq;
209
210 /* All ISUs are setup, complete initialization */
211 mpic_init(mpic);
212
213 /* Look for cascade */
214 pseries_setup_i8259_cascade();
215 }
216
pseries_xics_init_IRQ(void)217 static void __init pseries_xics_init_IRQ(void)
218 {
219 xics_init();
220 pseries_setup_i8259_cascade();
221 }
222
pseries_lpar_enable_pmcs(void)223 static void pseries_lpar_enable_pmcs(void)
224 {
225 unsigned long set, reset;
226
227 set = 1UL << 63;
228 reset = 0;
229 plpar_hcall_norets(H_PERFMON, set, reset);
230 }
231
pseries_discover_pic(void)232 static void __init pseries_discover_pic(void)
233 {
234 struct device_node *np;
235 const char *typep;
236
237 for_each_node_by_name(np, "interrupt-controller") {
238 typep = of_get_property(np, "compatible", NULL);
239 if (strstr(typep, "open-pic")) {
240 pSeries_mpic_node = of_node_get(np);
241 ppc_md.init_IRQ = pseries_mpic_init_IRQ;
242 setup_kexec_cpu_down_mpic();
243 smp_init_pseries_mpic();
244 return;
245 } else if (strstr(typep, "ppc-xicp")) {
246 ppc_md.init_IRQ = pseries_xics_init_IRQ;
247 setup_kexec_cpu_down_xics();
248 smp_init_pseries_xics();
249 return;
250 }
251 }
252 printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
253 " interrupt-controller\n");
254 }
255
pci_dn_reconfig_notifier(struct notifier_block * nb,unsigned long action,void * data)256 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *data)
257 {
258 struct of_reconfig_data *rd = data;
259 struct device_node *parent, *np = rd->dn;
260 struct pci_dn *pdn;
261 int err = NOTIFY_OK;
262
263 switch (action) {
264 case OF_RECONFIG_ATTACH_NODE:
265 parent = of_get_parent(np);
266 pdn = parent ? PCI_DN(parent) : NULL;
267 if (pdn) {
268 /* Create pdn and EEH device */
269 update_dn_pci_info(np, pdn->phb);
270 eeh_dev_init(PCI_DN(np), pdn->phb);
271 }
272
273 of_node_put(parent);
274 break;
275 case OF_RECONFIG_DETACH_NODE:
276 pdn = PCI_DN(np);
277 if (pdn)
278 list_del(&pdn->list);
279 break;
280 default:
281 err = NOTIFY_DONE;
282 break;
283 }
284 return err;
285 }
286
287 static struct notifier_block pci_dn_reconfig_nb = {
288 .notifier_call = pci_dn_reconfig_notifier,
289 };
290
291 struct kmem_cache *dtl_cache;
292
293 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
294 /*
295 * Allocate space for the dispatch trace log for all possible cpus
296 * and register the buffers with the hypervisor. This is used for
297 * computing time stolen by the hypervisor.
298 */
alloc_dispatch_logs(void)299 static int alloc_dispatch_logs(void)
300 {
301 int cpu, ret;
302 struct paca_struct *pp;
303 struct dtl_entry *dtl;
304
305 if (!firmware_has_feature(FW_FEATURE_SPLPAR))
306 return 0;
307
308 if (!dtl_cache)
309 return 0;
310
311 for_each_possible_cpu(cpu) {
312 pp = &paca[cpu];
313 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
314 if (!dtl) {
315 pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
316 cpu);
317 pr_warn("Stolen time statistics will be unreliable\n");
318 break;
319 }
320
321 pp->dtl_ridx = 0;
322 pp->dispatch_log = dtl;
323 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
324 pp->dtl_curr = dtl;
325 }
326
327 /* Register the DTL for the current (boot) cpu */
328 dtl = get_paca()->dispatch_log;
329 get_paca()->dtl_ridx = 0;
330 get_paca()->dtl_curr = dtl;
331 get_paca()->lppaca_ptr->dtl_idx = 0;
332
333 /* hypervisor reads buffer length from this field */
334 dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
335 ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
336 if (ret)
337 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
338 "with %d\n", smp_processor_id(),
339 hard_smp_processor_id(), ret);
340 get_paca()->lppaca_ptr->dtl_enable_mask = 2;
341
342 return 0;
343 }
344 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
alloc_dispatch_logs(void)345 static inline int alloc_dispatch_logs(void)
346 {
347 return 0;
348 }
349 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
350
alloc_dispatch_log_kmem_cache(void)351 static int alloc_dispatch_log_kmem_cache(void)
352 {
353 dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
354 DISPATCH_LOG_BYTES, 0, NULL);
355 if (!dtl_cache) {
356 pr_warn("Failed to create dispatch trace log buffer cache\n");
357 pr_warn("Stolen time statistics will be unreliable\n");
358 return 0;
359 }
360
361 return alloc_dispatch_logs();
362 }
363 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache);
364
pseries_lpar_idle(void)365 static void pseries_lpar_idle(void)
366 {
367 /*
368 * Default handler to go into low thread priority and possibly
369 * low power mode by cedeing processor to hypervisor
370 */
371
372 if (!prep_irq_for_idle())
373 return;
374
375 /* Indicate to hypervisor that we are idle. */
376 get_lppaca()->idle = 1;
377
378 /*
379 * Yield the processor to the hypervisor. We return if
380 * an external interrupt occurs (which are driven prior
381 * to returning here) or if a prod occurs from another
382 * processor. When returning here, external interrupts
383 * are enabled.
384 */
385 cede_processor();
386
387 get_lppaca()->idle = 0;
388 }
389
390 /*
391 * Enable relocation on during exceptions. This has partition wide scope and
392 * may take a while to complete, if it takes longer than one second we will
393 * just give up rather than wasting any more time on this - if that turns out
394 * to ever be a problem in practice we can move this into a kernel thread to
395 * finish off the process later in boot.
396 */
pSeries_enable_reloc_on_exc(void)397 long pSeries_enable_reloc_on_exc(void)
398 {
399 long rc;
400 unsigned int delay, total_delay = 0;
401
402 while (1) {
403 rc = enable_reloc_on_exceptions();
404 if (!H_IS_LONG_BUSY(rc))
405 return rc;
406
407 delay = get_longbusy_msecs(rc);
408 total_delay += delay;
409 if (total_delay > 1000) {
410 pr_warn("Warning: Giving up waiting to enable "
411 "relocation on exceptions (%u msec)!\n",
412 total_delay);
413 return rc;
414 }
415
416 mdelay(delay);
417 }
418 }
419 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc);
420
pSeries_disable_reloc_on_exc(void)421 long pSeries_disable_reloc_on_exc(void)
422 {
423 long rc;
424
425 while (1) {
426 rc = disable_reloc_on_exceptions();
427 if (!H_IS_LONG_BUSY(rc))
428 return rc;
429 mdelay(get_longbusy_msecs(rc));
430 }
431 }
432 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc);
433
434 #ifdef CONFIG_KEXEC
pSeries_machine_kexec(struct kimage * image)435 static void pSeries_machine_kexec(struct kimage *image)
436 {
437 long rc;
438
439 if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
440 rc = pSeries_disable_reloc_on_exc();
441 if (rc != H_SUCCESS)
442 pr_warning("Warning: Failed to disable relocation on "
443 "exceptions: %ld\n", rc);
444 }
445
446 default_machine_kexec(image);
447 }
448 #endif
449
450 #ifdef __LITTLE_ENDIAN__
pseries_big_endian_exceptions(void)451 long pseries_big_endian_exceptions(void)
452 {
453 long rc;
454
455 while (1) {
456 rc = enable_big_endian_exceptions();
457 if (!H_IS_LONG_BUSY(rc))
458 return rc;
459 mdelay(get_longbusy_msecs(rc));
460 }
461 }
462
pseries_little_endian_exceptions(void)463 static long pseries_little_endian_exceptions(void)
464 {
465 long rc;
466
467 while (1) {
468 rc = enable_little_endian_exceptions();
469 if (!H_IS_LONG_BUSY(rc))
470 return rc;
471 mdelay(get_longbusy_msecs(rc));
472 }
473 }
474 #endif
475
find_and_init_phbs(void)476 static void __init find_and_init_phbs(void)
477 {
478 struct device_node *node;
479 struct pci_controller *phb;
480 struct device_node *root = of_find_node_by_path("/");
481
482 for_each_child_of_node(root, node) {
483 if (node->type == NULL || (strcmp(node->type, "pci") != 0 &&
484 strcmp(node->type, "pciex") != 0))
485 continue;
486
487 phb = pcibios_alloc_controller(node);
488 if (!phb)
489 continue;
490 rtas_setup_phb(phb);
491 pci_process_bridge_OF_ranges(phb, node, 0);
492 isa_bridge_find_early(phb);
493 phb->controller_ops = pseries_pci_controller_ops;
494 }
495
496 of_node_put(root);
497 pci_devs_phb_init();
498
499 /*
500 * PCI_PROBE_ONLY and PCI_REASSIGN_ALL_BUS can be set via properties
501 * in chosen.
502 */
503 of_pci_check_probe_only();
504 }
505
init_cpu_char_feature_flags(struct h_cpu_char_result * result)506 static void init_cpu_char_feature_flags(struct h_cpu_char_result *result)
507 {
508 /*
509 * The features below are disabled by default, so we instead look to see
510 * if firmware has *enabled* them, and set them if so.
511 */
512 if (result->character & H_CPU_CHAR_SPEC_BAR_ORI31)
513 security_ftr_set(SEC_FTR_SPEC_BAR_ORI31);
514
515 if (result->character & H_CPU_CHAR_BCCTRL_SERIALISED)
516 security_ftr_set(SEC_FTR_BCCTRL_SERIALISED);
517
518 if (result->character & H_CPU_CHAR_L1D_FLUSH_ORI30)
519 security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30);
520
521 if (result->character & H_CPU_CHAR_L1D_FLUSH_TRIG2)
522 security_ftr_set(SEC_FTR_L1D_FLUSH_TRIG2);
523
524 if (result->character & H_CPU_CHAR_L1D_THREAD_PRIV)
525 security_ftr_set(SEC_FTR_L1D_THREAD_PRIV);
526
527 if (result->character & H_CPU_CHAR_COUNT_CACHE_DISABLED)
528 security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED);
529
530 if (result->character & H_CPU_CHAR_BCCTR_FLUSH_ASSIST)
531 security_ftr_set(SEC_FTR_BCCTR_FLUSH_ASSIST);
532
533 if (result->behaviour & H_CPU_BEHAV_FLUSH_COUNT_CACHE)
534 security_ftr_set(SEC_FTR_FLUSH_COUNT_CACHE);
535
536 /*
537 * The features below are enabled by default, so we instead look to see
538 * if firmware has *disabled* them, and clear them if so.
539 */
540 if (!(result->behaviour & H_CPU_BEHAV_FAVOUR_SECURITY))
541 security_ftr_clear(SEC_FTR_FAVOUR_SECURITY);
542
543 if (!(result->behaviour & H_CPU_BEHAV_L1D_FLUSH_PR))
544 security_ftr_clear(SEC_FTR_L1D_FLUSH_PR);
545
546 if (!(result->behaviour & H_CPU_BEHAV_BNDS_CHK_SPEC_BAR))
547 security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);
548 }
549
pseries_setup_rfi_flush(void)550 void pseries_setup_rfi_flush(void)
551 {
552 struct h_cpu_char_result result;
553 enum l1d_flush_type types;
554 bool enable;
555 long rc;
556
557 /*
558 * Set features to the defaults assumed by init_cpu_char_feature_flags()
559 * so it can set/clear again any features that might have changed after
560 * migration, and in case the hypercall fails and it is not even called.
561 */
562 powerpc_security_features = SEC_FTR_DEFAULT;
563
564 rc = plpar_get_cpu_characteristics(&result);
565 if (rc == H_SUCCESS)
566 init_cpu_char_feature_flags(&result);
567
568 /*
569 * We're the guest so this doesn't apply to us, clear it to simplify
570 * handling of it elsewhere.
571 */
572 security_ftr_clear(SEC_FTR_L1D_FLUSH_HV);
573
574 types = L1D_FLUSH_FALLBACK;
575
576 if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_TRIG2))
577 types |= L1D_FLUSH_MTTRIG;
578
579 if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_ORI30))
580 types |= L1D_FLUSH_ORI;
581
582 enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \
583 security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR);
584
585 setup_rfi_flush(types, enable);
586 setup_count_cache_flush();
587
588 enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
589 security_ftr_enabled(SEC_FTR_L1D_FLUSH_ENTRY);
590 setup_entry_flush(enable);
591
592 enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
593 security_ftr_enabled(SEC_FTR_L1D_FLUSH_UACCESS);
594 setup_uaccess_flush(enable);
595 }
596
pSeries_setup_arch(void)597 static void __init pSeries_setup_arch(void)
598 {
599 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
600
601 /* Discover PIC type and setup ppc_md accordingly */
602 pseries_discover_pic();
603
604 /* openpic global configuration register (64-bit format). */
605 /* openpic Interrupt Source Unit pointer (64-bit format). */
606 /* python0 facility area (mmio) (64-bit format) REAL address. */
607
608 /* init to some ~sane value until calibrate_delay() runs */
609 loops_per_jiffy = 50000000;
610
611 fwnmi_init();
612
613 pseries_setup_rfi_flush();
614 setup_stf_barrier();
615
616 /* By default, only probe PCI (can be overridden by rtas_pci) */
617 pci_add_flags(PCI_PROBE_ONLY);
618
619 /* Find and initialize PCI host bridges */
620 init_pci_config_tokens();
621 find_and_init_phbs();
622 of_reconfig_notifier_register(&pci_dn_reconfig_nb);
623
624 pSeries_nvram_init();
625
626 if (firmware_has_feature(FW_FEATURE_LPAR)) {
627 vpa_init(boot_cpuid);
628 ppc_md.power_save = pseries_lpar_idle;
629 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
630 } else {
631 /* No special idle routine */
632 ppc_md.enable_pmcs = power4_enable_pmcs;
633 }
634
635 ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
636
637 if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
638 long rc;
639
640 rc = pSeries_enable_reloc_on_exc();
641 if (rc == H_P2) {
642 pr_info("Relocation on exceptions not supported\n");
643 } else if (rc != H_SUCCESS) {
644 pr_warn("Unable to enable relocation on exceptions: "
645 "%ld\n", rc);
646 }
647 }
648 }
649
pSeries_init_panel(void)650 static int __init pSeries_init_panel(void)
651 {
652 /* Manually leave the kernel version on the panel. */
653 #ifdef __BIG_ENDIAN__
654 ppc_md.progress("Linux ppc64\n", 0);
655 #else
656 ppc_md.progress("Linux ppc64le\n", 0);
657 #endif
658 ppc_md.progress(init_utsname()->version, 0);
659
660 return 0;
661 }
662 machine_arch_initcall(pseries, pSeries_init_panel);
663
pseries_set_dabr(unsigned long dabr,unsigned long dabrx)664 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
665 {
666 return plpar_hcall_norets(H_SET_DABR, dabr);
667 }
668
pseries_set_xdabr(unsigned long dabr,unsigned long dabrx)669 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
670 {
671 /* Have to set at least one bit in the DABRX according to PAPR */
672 if (dabrx == 0 && dabr == 0)
673 dabrx = DABRX_USER;
674 /* PAPR says we can only set kernel and user bits */
675 dabrx &= DABRX_KERNEL | DABRX_USER;
676
677 return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
678 }
679
pseries_set_dawr(unsigned long dawr,unsigned long dawrx)680 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
681 {
682 /* PAPR says we can't set HYP */
683 dawrx &= ~DAWRX_HYP;
684
685 return plapr_set_watchpoint0(dawr, dawrx);
686 }
687
688 #define CMO_CHARACTERISTICS_TOKEN 44
689 #define CMO_MAXLENGTH 1026
690
pSeries_coalesce_init(void)691 void pSeries_coalesce_init(void)
692 {
693 struct hvcall_mpp_x_data mpp_x_data;
694
695 if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
696 powerpc_firmware_features |= FW_FEATURE_XCMO;
697 else
698 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
699 }
700
701 /**
702 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
703 * handle that here. (Stolen from parse_system_parameter_string)
704 */
pSeries_cmo_feature_init(void)705 static void pSeries_cmo_feature_init(void)
706 {
707 char *ptr, *key, *value, *end;
708 int call_status;
709 int page_order = IOMMU_PAGE_SHIFT_4K;
710
711 pr_debug(" -> fw_cmo_feature_init()\n");
712 spin_lock(&rtas_data_buf_lock);
713 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
714 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
715 NULL,
716 CMO_CHARACTERISTICS_TOKEN,
717 __pa(rtas_data_buf),
718 RTAS_DATA_BUF_SIZE);
719
720 if (call_status != 0) {
721 spin_unlock(&rtas_data_buf_lock);
722 pr_debug("CMO not available\n");
723 pr_debug(" <- fw_cmo_feature_init()\n");
724 return;
725 }
726
727 end = rtas_data_buf + CMO_MAXLENGTH - 2;
728 ptr = rtas_data_buf + 2; /* step over strlen value */
729 key = value = ptr;
730
731 while (*ptr && (ptr <= end)) {
732 /* Separate the key and value by replacing '=' with '\0' and
733 * point the value at the string after the '='
734 */
735 if (ptr[0] == '=') {
736 ptr[0] = '\0';
737 value = ptr + 1;
738 } else if (ptr[0] == '\0' || ptr[0] == ',') {
739 /* Terminate the string containing the key/value pair */
740 ptr[0] = '\0';
741
742 if (key == value) {
743 pr_debug("Malformed key/value pair\n");
744 /* Never found a '=', end processing */
745 break;
746 }
747
748 if (0 == strcmp(key, "CMOPageSize"))
749 page_order = simple_strtol(value, NULL, 10);
750 else if (0 == strcmp(key, "PrPSP"))
751 CMO_PrPSP = simple_strtol(value, NULL, 10);
752 else if (0 == strcmp(key, "SecPSP"))
753 CMO_SecPSP = simple_strtol(value, NULL, 10);
754 value = key = ptr + 1;
755 }
756 ptr++;
757 }
758
759 /* Page size is returned as the power of 2 of the page size,
760 * convert to the page size in bytes before returning
761 */
762 CMO_PageSize = 1 << page_order;
763 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
764
765 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
766 pr_info("CMO enabled\n");
767 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
768 CMO_SecPSP);
769 powerpc_firmware_features |= FW_FEATURE_CMO;
770 pSeries_coalesce_init();
771 } else
772 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
773 CMO_SecPSP);
774 spin_unlock(&rtas_data_buf_lock);
775 pr_debug(" <- fw_cmo_feature_init()\n");
776 }
777
778 /*
779 * Early initialization. Relocation is on but do not reference unbolted pages
780 */
pSeries_init_early(void)781 static void __init pSeries_init_early(void)
782 {
783 pr_debug(" -> pSeries_init_early()\n");
784
785 #ifdef CONFIG_HVC_CONSOLE
786 if (firmware_has_feature(FW_FEATURE_LPAR))
787 hvc_vio_init_early();
788 #endif
789 if (firmware_has_feature(FW_FEATURE_XDABR))
790 ppc_md.set_dabr = pseries_set_xdabr;
791 else if (firmware_has_feature(FW_FEATURE_DABR))
792 ppc_md.set_dabr = pseries_set_dabr;
793
794 if (firmware_has_feature(FW_FEATURE_SET_MODE))
795 ppc_md.set_dawr = pseries_set_dawr;
796
797 pSeries_cmo_feature_init();
798 iommu_init_early_pSeries();
799
800 pr_debug(" <- pSeries_init_early()\n");
801 }
802
803 /**
804 * pseries_power_off - tell firmware about how to power off the system.
805 *
806 * This function calls either the power-off rtas token in normal cases
807 * or the ibm,power-off-ups token (if present & requested) in case of
808 * a power failure. If power-off token is used, power on will only be
809 * possible with power button press. If ibm,power-off-ups token is used
810 * it will allow auto poweron after power is restored.
811 */
pseries_power_off(void)812 static void pseries_power_off(void)
813 {
814 int rc;
815 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
816
817 if (rtas_flash_term_hook)
818 rtas_flash_term_hook(SYS_POWER_OFF);
819
820 if (rtas_poweron_auto == 0 ||
821 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
822 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
823 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
824 } else {
825 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
826 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
827 }
828 for (;;);
829 }
830
831 /*
832 * Called very early, MMU is off, device-tree isn't unflattened
833 */
834
pseries_probe_fw_features(unsigned long node,const char * uname,int depth,void * data)835 static int __init pseries_probe_fw_features(unsigned long node,
836 const char *uname, int depth,
837 void *data)
838 {
839 const char *prop;
840 int len;
841 static int hypertas_found;
842 static int vec5_found;
843
844 if (depth != 1)
845 return 0;
846
847 if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
848 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
849 &len);
850 if (prop) {
851 powerpc_firmware_features |= FW_FEATURE_LPAR;
852 fw_hypertas_feature_init(prop, len);
853 }
854
855 hypertas_found = 1;
856 }
857
858 if (!strcmp(uname, "chosen")) {
859 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
860 &len);
861 if (prop)
862 fw_vec5_feature_init(prop, len);
863
864 vec5_found = 1;
865 }
866
867 return hypertas_found && vec5_found;
868 }
869
pSeries_probe(void)870 static int __init pSeries_probe(void)
871 {
872 unsigned long root = of_get_flat_dt_root();
873 const char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
874
875 if (dtype == NULL)
876 return 0;
877 if (strcmp(dtype, "chrp"))
878 return 0;
879
880 /* Cell blades firmware claims to be chrp while it's not. Until this
881 * is fixed, we need to avoid those here.
882 */
883 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
884 of_flat_dt_is_compatible(root, "IBM,CBEA"))
885 return 0;
886
887 pr_debug("pSeries detected, looking for LPAR capability...\n");
888
889 /* Now try to figure out if we are running on LPAR */
890 of_scan_flat_dt(pseries_probe_fw_features, NULL);
891
892 #ifdef __LITTLE_ENDIAN__
893 if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
894 long rc;
895 /*
896 * Tell the hypervisor that we want our exceptions to
897 * be taken in little endian mode. If this fails we don't
898 * want to use BUG() because it will trigger an exception.
899 */
900 rc = pseries_little_endian_exceptions();
901 if (rc) {
902 ppc_md.progress("H_SET_MODE LE exception fail", 0);
903 panic("Could not enable little endian exceptions");
904 }
905 }
906 #endif
907
908 if (firmware_has_feature(FW_FEATURE_LPAR))
909 hpte_init_lpar();
910 else
911 hpte_init_native();
912
913 pm_power_off = pseries_power_off;
914
915 pr_debug("Machine is%s LPAR !\n",
916 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
917
918 return 1;
919 }
920
pSeries_pci_probe_mode(struct pci_bus * bus)921 static int pSeries_pci_probe_mode(struct pci_bus *bus)
922 {
923 if (firmware_has_feature(FW_FEATURE_LPAR))
924 return PCI_PROBE_DEVTREE;
925 return PCI_PROBE_NORMAL;
926 }
927
928 struct pci_controller_ops pseries_pci_controller_ops = {
929 .probe_mode = pSeries_pci_probe_mode,
930 };
931
define_machine(pseries)932 define_machine(pseries) {
933 .name = "pSeries",
934 .probe = pSeries_probe,
935 .setup_arch = pSeries_setup_arch,
936 .init_early = pSeries_init_early,
937 .show_cpuinfo = pSeries_show_cpuinfo,
938 .log_error = pSeries_log_error,
939 .pcibios_fixup = pSeries_final_fixup,
940 .restart = rtas_restart,
941 .halt = rtas_halt,
942 .panic = rtas_os_term,
943 .get_boot_time = rtas_get_boot_time,
944 .get_rtc_time = rtas_get_rtc_time,
945 .set_rtc_time = rtas_set_rtc_time,
946 .calibrate_decr = generic_calibrate_decr,
947 .progress = rtas_progress,
948 .system_reset_exception = pSeries_system_reset_exception,
949 .machine_check_exception = pSeries_machine_check_exception,
950 #ifdef CONFIG_KEXEC
951 .machine_kexec = pSeries_machine_kexec,
952 #endif
953 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
954 .memory_block_size = pseries_memory_block_size,
955 #endif
956 };
957