1 /*
2 * PowerNV OPAL high level interfaces
3 *
4 * Copyright 2011 IBM Corp.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #undef DEBUG
13
14 #include <linux/types.h>
15 #include <linux/of.h>
16 #include <linux/of_fdt.h>
17 #include <linux/of_platform.h>
18 #include <linux/interrupt.h>
19 #include <linux/notifier.h>
20 #include <linux/slab.h>
21 #include <linux/sched.h>
22 #include <linux/kobject.h>
23 #include <linux/delay.h>
24 #include <linux/memblock.h>
25
26 #include <asm/machdep.h>
27 #include <asm/opal.h>
28 #include <asm/firmware.h>
29 #include <asm/mce.h>
30
31 #include "powernv.h"
32
33 /* /sys/firmware/opal */
34 struct kobject *opal_kobj;
35
36 struct opal {
37 u64 base;
38 u64 entry;
39 u64 size;
40 } opal;
41
42 struct mcheck_recoverable_range {
43 u64 start_addr;
44 u64 end_addr;
45 u64 recover_addr;
46 };
47
48 static struct mcheck_recoverable_range *mc_recoverable_range;
49 static int mc_recoverable_range_len;
50
51 struct device_node *opal_node;
52 static DEFINE_SPINLOCK(opal_write_lock);
53 extern u64 opal_mc_secondary_handler[];
54 static unsigned int *opal_irqs;
55 static unsigned int opal_irq_count;
56 static ATOMIC_NOTIFIER_HEAD(opal_notifier_head);
57 static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX];
58 static DEFINE_SPINLOCK(opal_notifier_lock);
59 static uint64_t last_notified_mask = 0x0ul;
60 static atomic_t opal_notifier_hold = ATOMIC_INIT(0);
61
opal_reinit_cores(void)62 static void opal_reinit_cores(void)
63 {
64 /* Do the actual re-init, This will clobber all FPRs, VRs, etc...
65 *
66 * It will preserve non volatile GPRs and HSPRG0/1. It will
67 * also restore HIDs and other SPRs to their original value
68 * but it might clobber a bunch.
69 */
70 #ifdef __BIG_ENDIAN__
71 opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE);
72 #else
73 opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE);
74 #endif
75 }
76
early_init_dt_scan_opal(unsigned long node,const char * uname,int depth,void * data)77 int __init early_init_dt_scan_opal(unsigned long node,
78 const char *uname, int depth, void *data)
79 {
80 const void *basep, *entryp, *sizep;
81 int basesz, entrysz, runtimesz;
82
83 if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
84 return 0;
85
86 basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
87 entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
88 sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz);
89
90 if (!basep || !entryp || !sizep)
91 return 1;
92
93 opal.base = of_read_number(basep, basesz/4);
94 opal.entry = of_read_number(entryp, entrysz/4);
95 opal.size = of_read_number(sizep, runtimesz/4);
96
97 pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n",
98 opal.base, basep, basesz);
99 pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n",
100 opal.entry, entryp, entrysz);
101 pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n",
102 opal.size, sizep, runtimesz);
103
104 powerpc_firmware_features |= FW_FEATURE_OPAL;
105 if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
106 powerpc_firmware_features |= FW_FEATURE_OPALv2;
107 powerpc_firmware_features |= FW_FEATURE_OPALv3;
108 pr_info("OPAL V3 detected !\n");
109 } else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) {
110 powerpc_firmware_features |= FW_FEATURE_OPALv2;
111 pr_info("OPAL V2 detected !\n");
112 } else {
113 pr_info("OPAL V1 detected !\n");
114 }
115
116 /* Reinit all cores with the right endian */
117 opal_reinit_cores();
118
119 /* Restore some bits */
120 if (cur_cpu_spec->cpu_restore)
121 cur_cpu_spec->cpu_restore();
122
123 return 1;
124 }
125
early_init_dt_scan_recoverable_ranges(unsigned long node,const char * uname,int depth,void * data)126 int __init early_init_dt_scan_recoverable_ranges(unsigned long node,
127 const char *uname, int depth, void *data)
128 {
129 int i, psize, size;
130 const __be32 *prop;
131
132 if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
133 return 0;
134
135 prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize);
136
137 if (!prop)
138 return 1;
139
140 pr_debug("Found machine check recoverable ranges.\n");
141
142 /*
143 * Calculate number of available entries.
144 *
145 * Each recoverable address range entry is (start address, len,
146 * recovery address), 2 cells each for start and recovery address,
147 * 1 cell for len, totalling 5 cells per entry.
148 */
149 mc_recoverable_range_len = psize / (sizeof(*prop) * 5);
150
151 /* Sanity check */
152 if (!mc_recoverable_range_len)
153 return 1;
154
155 /* Size required to hold all the entries. */
156 size = mc_recoverable_range_len *
157 sizeof(struct mcheck_recoverable_range);
158
159 /*
160 * Allocate a buffer to hold the MC recoverable ranges. We would be
161 * accessing them in real mode, hence it needs to be within
162 * RMO region.
163 */
164 mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64),
165 ppc64_rma_size));
166 memset(mc_recoverable_range, 0, size);
167
168 for (i = 0; i < mc_recoverable_range_len; i++) {
169 mc_recoverable_range[i].start_addr =
170 of_read_number(prop + (i * 5) + 0, 2);
171 mc_recoverable_range[i].end_addr =
172 mc_recoverable_range[i].start_addr +
173 of_read_number(prop + (i * 5) + 2, 1);
174 mc_recoverable_range[i].recover_addr =
175 of_read_number(prop + (i * 5) + 3, 2);
176
177 pr_debug("Machine check recoverable range: %llx..%llx: %llx\n",
178 mc_recoverable_range[i].start_addr,
179 mc_recoverable_range[i].end_addr,
180 mc_recoverable_range[i].recover_addr);
181 }
182 return 1;
183 }
184
opal_register_exception_handlers(void)185 static int __init opal_register_exception_handlers(void)
186 {
187 #ifdef __BIG_ENDIAN__
188 u64 glue;
189
190 if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
191 return -ENODEV;
192
193 /* Hookup some exception handlers except machine check. We use the
194 * fwnmi area at 0x7000 to provide the glue space to OPAL
195 */
196 glue = 0x7000;
197
198 /*
199 * Check if we are running on newer firmware that exports
200 * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch
201 * the HMI interrupt and we catch it directly in Linux.
202 *
203 * For older firmware (i.e currently released POWER8 System Firmware
204 * as of today <= SV810_087), we fallback to old behavior and let OPAL
205 * patch the HMI vector and handle it inside OPAL firmware.
206 *
207 * For newer firmware (in development/yet to be released) we will
208 * start catching/handling HMI directly in Linux.
209 */
210 if (!opal_check_token(OPAL_HANDLE_HMI)) {
211 pr_info("opal: Old firmware detected, OPAL handles HMIs.\n");
212 opal_register_exception_handler(
213 OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
214 0, glue);
215 glue += 128;
216 }
217
218 opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
219 #endif
220
221 return 0;
222 }
223 machine_early_initcall(powernv, opal_register_exception_handlers);
224
opal_notifier_register(struct notifier_block * nb)225 int opal_notifier_register(struct notifier_block *nb)
226 {
227 if (!nb) {
228 pr_warning("%s: Invalid argument (%p)\n",
229 __func__, nb);
230 return -EINVAL;
231 }
232
233 atomic_notifier_chain_register(&opal_notifier_head, nb);
234 return 0;
235 }
236 EXPORT_SYMBOL_GPL(opal_notifier_register);
237
opal_notifier_unregister(struct notifier_block * nb)238 int opal_notifier_unregister(struct notifier_block *nb)
239 {
240 if (!nb) {
241 pr_warning("%s: Invalid argument (%p)\n",
242 __func__, nb);
243 return -EINVAL;
244 }
245
246 atomic_notifier_chain_unregister(&opal_notifier_head, nb);
247 return 0;
248 }
249 EXPORT_SYMBOL_GPL(opal_notifier_unregister);
250
opal_do_notifier(uint64_t events)251 static void opal_do_notifier(uint64_t events)
252 {
253 unsigned long flags;
254 uint64_t changed_mask;
255
256 if (atomic_read(&opal_notifier_hold))
257 return;
258
259 spin_lock_irqsave(&opal_notifier_lock, flags);
260 changed_mask = last_notified_mask ^ events;
261 last_notified_mask = events;
262 spin_unlock_irqrestore(&opal_notifier_lock, flags);
263
264 /*
265 * We feed with the event bits and changed bits for
266 * enough information to the callback.
267 */
268 atomic_notifier_call_chain(&opal_notifier_head,
269 events, (void *)changed_mask);
270 }
271
opal_notifier_update_evt(uint64_t evt_mask,uint64_t evt_val)272 void opal_notifier_update_evt(uint64_t evt_mask,
273 uint64_t evt_val)
274 {
275 unsigned long flags;
276
277 spin_lock_irqsave(&opal_notifier_lock, flags);
278 last_notified_mask &= ~evt_mask;
279 last_notified_mask |= evt_val;
280 spin_unlock_irqrestore(&opal_notifier_lock, flags);
281 }
282
opal_notifier_enable(void)283 void opal_notifier_enable(void)
284 {
285 int64_t rc;
286 __be64 evt = 0;
287
288 atomic_set(&opal_notifier_hold, 0);
289
290 /* Process pending events */
291 rc = opal_poll_events(&evt);
292 if (rc == OPAL_SUCCESS && evt)
293 opal_do_notifier(be64_to_cpu(evt));
294 }
295
opal_notifier_disable(void)296 void opal_notifier_disable(void)
297 {
298 atomic_set(&opal_notifier_hold, 1);
299 }
300
301 /*
302 * Opal message notifier based on message type. Allow subscribers to get
303 * notified for specific messgae type.
304 */
opal_message_notifier_register(enum OpalMessageType msg_type,struct notifier_block * nb)305 int opal_message_notifier_register(enum OpalMessageType msg_type,
306 struct notifier_block *nb)
307 {
308 if (!nb) {
309 pr_warning("%s: Invalid argument (%p)\n",
310 __func__, nb);
311 return -EINVAL;
312 }
313 if (msg_type > OPAL_MSG_TYPE_MAX) {
314 pr_warning("%s: Invalid message type argument (%d)\n",
315 __func__, msg_type);
316 return -EINVAL;
317 }
318 return atomic_notifier_chain_register(
319 &opal_msg_notifier_head[msg_type], nb);
320 }
321
opal_message_do_notify(uint32_t msg_type,void * msg)322 static void opal_message_do_notify(uint32_t msg_type, void *msg)
323 {
324 /* notify subscribers */
325 atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type],
326 msg_type, msg);
327 }
328
opal_handle_message(void)329 static void opal_handle_message(void)
330 {
331 s64 ret;
332 /*
333 * TODO: pre-allocate a message buffer depending on opal-msg-size
334 * value in /proc/device-tree.
335 */
336 static struct opal_msg msg;
337 u32 type;
338
339 ret = opal_get_msg(__pa(&msg), sizeof(msg));
340 /* No opal message pending. */
341 if (ret == OPAL_RESOURCE)
342 return;
343
344 /* check for errors. */
345 if (ret) {
346 pr_warning("%s: Failed to retrieve opal message, err=%lld\n",
347 __func__, ret);
348 return;
349 }
350
351 type = be32_to_cpu(msg.msg_type);
352
353 /* Sanity check */
354 if (type > OPAL_MSG_TYPE_MAX) {
355 pr_warning("%s: Unknown message type: %u\n", __func__, type);
356 return;
357 }
358 opal_message_do_notify(type, (void *)&msg);
359 }
360
opal_message_notify(struct notifier_block * nb,unsigned long events,void * change)361 static int opal_message_notify(struct notifier_block *nb,
362 unsigned long events, void *change)
363 {
364 if (events & OPAL_EVENT_MSG_PENDING)
365 opal_handle_message();
366 return 0;
367 }
368
369 static struct notifier_block opal_message_nb = {
370 .notifier_call = opal_message_notify,
371 .next = NULL,
372 .priority = 0,
373 };
374
opal_message_init(void)375 static int __init opal_message_init(void)
376 {
377 int ret, i;
378
379 for (i = 0; i < OPAL_MSG_TYPE_MAX; i++)
380 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]);
381
382 ret = opal_notifier_register(&opal_message_nb);
383 if (ret) {
384 pr_err("%s: Can't register OPAL event notifier (%d)\n",
385 __func__, ret);
386 return ret;
387 }
388 return 0;
389 }
390 machine_early_initcall(powernv, opal_message_init);
391
opal_get_chars(uint32_t vtermno,char * buf,int count)392 int opal_get_chars(uint32_t vtermno, char *buf, int count)
393 {
394 s64 rc;
395 __be64 evt, len;
396
397 if (!opal.entry)
398 return -ENODEV;
399 opal_poll_events(&evt);
400 if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0)
401 return 0;
402 len = cpu_to_be64(count);
403 rc = opal_console_read(vtermno, &len, buf);
404 if (rc == OPAL_SUCCESS)
405 return be64_to_cpu(len);
406 return 0;
407 }
408
opal_put_chars(uint32_t vtermno,const char * data,int total_len)409 int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
410 {
411 int written = 0;
412 __be64 olen;
413 s64 len, rc;
414 unsigned long flags;
415 __be64 evt;
416
417 if (!opal.entry)
418 return -ENODEV;
419
420 /* We want put_chars to be atomic to avoid mangling of hvsi
421 * packets. To do that, we first test for room and return
422 * -EAGAIN if there isn't enough.
423 *
424 * Unfortunately, opal_console_write_buffer_space() doesn't
425 * appear to work on opal v1, so we just assume there is
426 * enough room and be done with it
427 */
428 spin_lock_irqsave(&opal_write_lock, flags);
429 if (firmware_has_feature(FW_FEATURE_OPALv2)) {
430 rc = opal_console_write_buffer_space(vtermno, &olen);
431 len = be64_to_cpu(olen);
432 if (rc || len < total_len) {
433 spin_unlock_irqrestore(&opal_write_lock, flags);
434 /* Closed -> drop characters */
435 if (rc)
436 return total_len;
437 opal_poll_events(NULL);
438 return -EAGAIN;
439 }
440 }
441
442 /* We still try to handle partial completions, though they
443 * should no longer happen.
444 */
445 rc = OPAL_BUSY;
446 while(total_len > 0 && (rc == OPAL_BUSY ||
447 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
448 olen = cpu_to_be64(total_len);
449 rc = opal_console_write(vtermno, &olen, data);
450 len = be64_to_cpu(olen);
451
452 /* Closed or other error drop */
453 if (rc != OPAL_SUCCESS && rc != OPAL_BUSY &&
454 rc != OPAL_BUSY_EVENT) {
455 written = total_len;
456 break;
457 }
458 if (rc == OPAL_SUCCESS) {
459 total_len -= len;
460 data += len;
461 written += len;
462 }
463 /* This is a bit nasty but we need that for the console to
464 * flush when there aren't any interrupts. We will clean
465 * things a bit later to limit that to synchronous path
466 * such as the kernel console and xmon/udbg
467 */
468 do
469 opal_poll_events(&evt);
470 while(rc == OPAL_SUCCESS &&
471 (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT));
472 }
473 spin_unlock_irqrestore(&opal_write_lock, flags);
474 return written;
475 }
476
opal_recover_mce(struct pt_regs * regs,struct machine_check_event * evt)477 static int opal_recover_mce(struct pt_regs *regs,
478 struct machine_check_event *evt)
479 {
480 int recovered = 0;
481 uint64_t ea = get_mce_fault_addr(evt);
482
483 if (!(regs->msr & MSR_RI)) {
484 /* If MSR_RI isn't set, we cannot recover */
485 recovered = 0;
486 } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) {
487 /* Platform corrected itself */
488 recovered = 1;
489 } else if (ea && !is_kernel_addr(ea)) {
490 /*
491 * Faulting address is not in kernel text. We should be fine.
492 * We need to find which process uses this address.
493 * For now, kill the task if we have received exception when
494 * in userspace.
495 *
496 * TODO: Queue up this address for hwpoisioning later.
497 */
498 if (user_mode(regs) && !is_global_init(current)) {
499 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
500 recovered = 1;
501 } else
502 recovered = 0;
503 } else if (user_mode(regs) && !is_global_init(current) &&
504 evt->severity == MCE_SEV_ERROR_SYNC) {
505 /*
506 * If we have received a synchronous error when in userspace
507 * kill the task.
508 */
509 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
510 recovered = 1;
511 }
512 return recovered;
513 }
514
opal_machine_check(struct pt_regs * regs)515 int opal_machine_check(struct pt_regs *regs)
516 {
517 struct machine_check_event evt;
518
519 if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
520 return 0;
521
522 /* Print things out */
523 if (evt.version != MCE_V1) {
524 pr_err("Machine Check Exception, Unknown event version %d !\n",
525 evt.version);
526 return 0;
527 }
528 machine_check_print_event_info(&evt);
529
530 if (opal_recover_mce(regs, &evt))
531 return 1;
532 return 0;
533 }
534
535 /* Early hmi handler called in real mode. */
opal_hmi_exception_early(struct pt_regs * regs)536 int opal_hmi_exception_early(struct pt_regs *regs)
537 {
538 s64 rc;
539
540 /*
541 * call opal hmi handler. Pass paca address as token.
542 * The return value OPAL_SUCCESS is an indication that there is
543 * an HMI event generated waiting to pull by Linux.
544 */
545 rc = opal_handle_hmi();
546 if (rc == OPAL_SUCCESS) {
547 local_paca->hmi_event_available = 1;
548 return 1;
549 }
550 return 0;
551 }
552
553 /* HMI exception handler called in virtual mode during check_irq_replay. */
opal_handle_hmi_exception(struct pt_regs * regs)554 int opal_handle_hmi_exception(struct pt_regs *regs)
555 {
556 s64 rc;
557 __be64 evt = 0;
558
559 /*
560 * Check if HMI event is available.
561 * if Yes, then call opal_poll_events to pull opal messages and
562 * process them.
563 */
564 if (!local_paca->hmi_event_available)
565 return 0;
566
567 local_paca->hmi_event_available = 0;
568 rc = opal_poll_events(&evt);
569 if (rc == OPAL_SUCCESS && evt)
570 opal_do_notifier(be64_to_cpu(evt));
571
572 return 1;
573 }
574
find_recovery_address(uint64_t nip)575 static uint64_t find_recovery_address(uint64_t nip)
576 {
577 int i;
578
579 for (i = 0; i < mc_recoverable_range_len; i++)
580 if ((nip >= mc_recoverable_range[i].start_addr) &&
581 (nip < mc_recoverable_range[i].end_addr))
582 return mc_recoverable_range[i].recover_addr;
583 return 0;
584 }
585
opal_mce_check_early_recovery(struct pt_regs * regs)586 bool opal_mce_check_early_recovery(struct pt_regs *regs)
587 {
588 uint64_t recover_addr = 0;
589
590 if (!opal.base || !opal.size)
591 goto out;
592
593 if ((regs->nip >= opal.base) &&
594 (regs->nip <= (opal.base + opal.size)))
595 recover_addr = find_recovery_address(regs->nip);
596
597 /*
598 * Setup regs->nip to rfi into fixup address.
599 */
600 if (recover_addr)
601 regs->nip = recover_addr;
602
603 out:
604 return !!recover_addr;
605 }
606
opal_interrupt(int irq,void * data)607 static irqreturn_t opal_interrupt(int irq, void *data)
608 {
609 __be64 events;
610
611 opal_handle_interrupt(virq_to_hw(irq), &events);
612
613 opal_do_notifier(be64_to_cpu(events));
614
615 return IRQ_HANDLED;
616 }
617
opal_sysfs_init(void)618 static int opal_sysfs_init(void)
619 {
620 opal_kobj = kobject_create_and_add("opal", firmware_kobj);
621 if (!opal_kobj) {
622 pr_warn("kobject_create_and_add opal failed\n");
623 return -ENOMEM;
624 }
625
626 return 0;
627 }
628
opal_dump_region_init(void)629 static void __init opal_dump_region_init(void)
630 {
631 void *addr;
632 uint64_t size;
633 int rc;
634
635 /* Register kernel log buffer */
636 addr = log_buf_addr_get();
637 size = log_buf_len_get();
638 rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
639 __pa(addr), size);
640 /* Don't warn if this is just an older OPAL that doesn't
641 * know about that call
642 */
643 if (rc && rc != OPAL_UNSUPPORTED)
644 pr_warn("DUMP: Failed to register kernel log buffer. "
645 "rc = %d\n", rc);
646 }
opal_init(void)647 static int __init opal_init(void)
648 {
649 struct device_node *np, *consoles;
650 const __be32 *irqs;
651 int rc, i, irqlen;
652
653 opal_node = of_find_node_by_path("/ibm,opal");
654 if (!opal_node) {
655 pr_warn("opal: Node not found\n");
656 return -ENODEV;
657 }
658
659 /* Register OPAL consoles if any ports */
660 if (firmware_has_feature(FW_FEATURE_OPALv2))
661 consoles = of_find_node_by_path("/ibm,opal/consoles");
662 else
663 consoles = of_node_get(opal_node);
664 if (consoles) {
665 for_each_child_of_node(consoles, np) {
666 if (strcmp(np->name, "serial"))
667 continue;
668 of_platform_device_create(np, NULL, NULL);
669 }
670 of_node_put(consoles);
671 }
672
673 /* Find all OPAL interrupts and request them */
674 irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
675 pr_debug("opal: Found %d interrupts reserved for OPAL\n",
676 irqs ? (irqlen / 4) : 0);
677 opal_irq_count = irqlen / 4;
678 opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL);
679 for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) {
680 unsigned int hwirq = be32_to_cpup(irqs);
681 unsigned int irq = irq_create_mapping(NULL, hwirq);
682 if (irq == NO_IRQ) {
683 pr_warning("opal: Failed to map irq 0x%x\n", hwirq);
684 continue;
685 }
686 rc = request_irq(irq, opal_interrupt, 0, "opal", NULL);
687 if (rc)
688 pr_warning("opal: Error %d requesting irq %d"
689 " (0x%x)\n", rc, irq, hwirq);
690 opal_irqs[i] = irq;
691 }
692
693 /* Create "opal" kobject under /sys/firmware */
694 rc = opal_sysfs_init();
695 if (rc == 0) {
696 /* Setup dump region interface */
697 opal_dump_region_init();
698 /* Setup error log interface */
699 rc = opal_elog_init();
700 /* Setup code update interface */
701 opal_flash_init();
702 /* Setup platform dump extract interface */
703 opal_platform_dump_init();
704 /* Setup system parameters interface */
705 opal_sys_param_init();
706 /* Setup message log interface. */
707 opal_msglog_init();
708 }
709
710 return 0;
711 }
712 machine_subsys_initcall(powernv, opal_init);
713
opal_shutdown(void)714 void opal_shutdown(void)
715 {
716 unsigned int i;
717 long rc = OPAL_BUSY;
718
719 /* First free interrupts, which will also mask them */
720 for (i = 0; i < opal_irq_count; i++) {
721 if (opal_irqs[i])
722 free_irq(opal_irqs[i], NULL);
723 opal_irqs[i] = 0;
724 }
725
726 /*
727 * Then sync with OPAL which ensure anything that can
728 * potentially write to our memory has completed such
729 * as an ongoing dump retrieval
730 */
731 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
732 rc = opal_sync_host_reboot();
733 if (rc == OPAL_BUSY)
734 opal_poll_events(NULL);
735 else
736 mdelay(10);
737 }
738
739 /* Unregister memory dump region */
740 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF);
741 }
742
743 /* Export this so that test modules can use it */
744 EXPORT_SYMBOL_GPL(opal_invalid_call);
745
746 /* Convert a region of vmalloc memory to an opal sg list */
opal_vmalloc_to_sg_list(void * vmalloc_addr,unsigned long vmalloc_size)747 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
748 unsigned long vmalloc_size)
749 {
750 struct opal_sg_list *sg, *first = NULL;
751 unsigned long i = 0;
752
753 sg = kzalloc(PAGE_SIZE, GFP_KERNEL);
754 if (!sg)
755 goto nomem;
756
757 first = sg;
758
759 while (vmalloc_size > 0) {
760 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT;
761 uint64_t length = min(vmalloc_size, PAGE_SIZE);
762
763 sg->entry[i].data = cpu_to_be64(data);
764 sg->entry[i].length = cpu_to_be64(length);
765 i++;
766
767 if (i >= SG_ENTRIES_PER_NODE) {
768 struct opal_sg_list *next;
769
770 next = kzalloc(PAGE_SIZE, GFP_KERNEL);
771 if (!next)
772 goto nomem;
773
774 sg->length = cpu_to_be64(
775 i * sizeof(struct opal_sg_entry) + 16);
776 i = 0;
777 sg->next = cpu_to_be64(__pa(next));
778 sg = next;
779 }
780
781 vmalloc_addr += length;
782 vmalloc_size -= length;
783 }
784
785 sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16);
786
787 return first;
788
789 nomem:
790 pr_err("%s : Failed to allocate memory\n", __func__);
791 opal_free_sg_list(first);
792 return NULL;
793 }
794
opal_free_sg_list(struct opal_sg_list * sg)795 void opal_free_sg_list(struct opal_sg_list *sg)
796 {
797 while (sg) {
798 uint64_t next = be64_to_cpu(sg->next);
799
800 kfree(sg);
801
802 if (next)
803 sg = __va(next);
804 else
805 sg = NULL;
806 }
807 }
808