sched/cputime: Fix omitted ticks passed in parameter
[deliverable/linux.git] / arch / powerpc / platforms / powernv / opal.c
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 #define pr_fmt(fmt) "opal: " fmt
13
14 #include <linux/printk.h>
15 #include <linux/types.h>
16 #include <linux/of.h>
17 #include <linux/of_fdt.h>
18 #include <linux/of_platform.h>
19 #include <linux/interrupt.h>
20 #include <linux/notifier.h>
21 #include <linux/slab.h>
22 #include <linux/sched.h>
23 #include <linux/kobject.h>
24 #include <linux/delay.h>
25 #include <linux/memblock.h>
26 #include <linux/kthread.h>
27 #include <linux/freezer.h>
28
29 #include <asm/machdep.h>
30 #include <asm/opal.h>
31 #include <asm/firmware.h>
32 #include <asm/mce.h>
33
34 #include "powernv.h"
35
36 /* /sys/firmware/opal */
37 struct kobject *opal_kobj;
38
39 struct opal {
40 u64 base;
41 u64 entry;
42 u64 size;
43 } opal;
44
45 struct mcheck_recoverable_range {
46 u64 start_addr;
47 u64 end_addr;
48 u64 recover_addr;
49 };
50
51 static struct mcheck_recoverable_range *mc_recoverable_range;
52 static int mc_recoverable_range_len;
53
54 struct device_node *opal_node;
55 static DEFINE_SPINLOCK(opal_write_lock);
56 static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX];
57 static uint32_t opal_heartbeat;
58 static struct task_struct *kopald_tsk;
59
60 void opal_configure_cores(void)
61 {
62 /* Do the actual re-init, This will clobber all FPRs, VRs, etc...
63 *
64 * It will preserve non volatile GPRs and HSPRG0/1. It will
65 * also restore HIDs and other SPRs to their original value
66 * but it might clobber a bunch.
67 */
68 #ifdef __BIG_ENDIAN__
69 opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE);
70 #else
71 opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE);
72 #endif
73
74 /* Restore some bits */
75 if (cur_cpu_spec->cpu_restore)
76 cur_cpu_spec->cpu_restore();
77 }
78
79 int __init early_init_dt_scan_opal(unsigned long node,
80 const char *uname, int depth, void *data)
81 {
82 const void *basep, *entryp, *sizep;
83 int basesz, entrysz, runtimesz;
84
85 if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
86 return 0;
87
88 basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
89 entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
90 sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz);
91
92 if (!basep || !entryp || !sizep)
93 return 1;
94
95 opal.base = of_read_number(basep, basesz/4);
96 opal.entry = of_read_number(entryp, entrysz/4);
97 opal.size = of_read_number(sizep, runtimesz/4);
98
99 pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n",
100 opal.base, basep, basesz);
101 pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n",
102 opal.entry, entryp, entrysz);
103 pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n",
104 opal.size, sizep, runtimesz);
105
106 if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
107 powerpc_firmware_features |= FW_FEATURE_OPAL;
108 pr_info("OPAL detected !\n");
109 } else {
110 panic("OPAL != V3 detected, no longer supported.\n");
111 }
112
113 return 1;
114 }
115
116 int __init early_init_dt_scan_recoverable_ranges(unsigned long node,
117 const char *uname, int depth, void *data)
118 {
119 int i, psize, size;
120 const __be32 *prop;
121
122 if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
123 return 0;
124
125 prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize);
126
127 if (!prop)
128 return 1;
129
130 pr_debug("Found machine check recoverable ranges.\n");
131
132 /*
133 * Calculate number of available entries.
134 *
135 * Each recoverable address range entry is (start address, len,
136 * recovery address), 2 cells each for start and recovery address,
137 * 1 cell for len, totalling 5 cells per entry.
138 */
139 mc_recoverable_range_len = psize / (sizeof(*prop) * 5);
140
141 /* Sanity check */
142 if (!mc_recoverable_range_len)
143 return 1;
144
145 /* Size required to hold all the entries. */
146 size = mc_recoverable_range_len *
147 sizeof(struct mcheck_recoverable_range);
148
149 /*
150 * Allocate a buffer to hold the MC recoverable ranges. We would be
151 * accessing them in real mode, hence it needs to be within
152 * RMO region.
153 */
154 mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64),
155 ppc64_rma_size));
156 memset(mc_recoverable_range, 0, size);
157
158 for (i = 0; i < mc_recoverable_range_len; i++) {
159 mc_recoverable_range[i].start_addr =
160 of_read_number(prop + (i * 5) + 0, 2);
161 mc_recoverable_range[i].end_addr =
162 mc_recoverable_range[i].start_addr +
163 of_read_number(prop + (i * 5) + 2, 1);
164 mc_recoverable_range[i].recover_addr =
165 of_read_number(prop + (i * 5) + 3, 2);
166
167 pr_debug("Machine check recoverable range: %llx..%llx: %llx\n",
168 mc_recoverable_range[i].start_addr,
169 mc_recoverable_range[i].end_addr,
170 mc_recoverable_range[i].recover_addr);
171 }
172 return 1;
173 }
174
175 static int __init opal_register_exception_handlers(void)
176 {
177 #ifdef __BIG_ENDIAN__
178 u64 glue;
179
180 if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
181 return -ENODEV;
182
183 /* Hookup some exception handlers except machine check. We use the
184 * fwnmi area at 0x7000 to provide the glue space to OPAL
185 */
186 glue = 0x7000;
187
188 /*
189 * Check if we are running on newer firmware that exports
190 * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch
191 * the HMI interrupt and we catch it directly in Linux.
192 *
193 * For older firmware (i.e currently released POWER8 System Firmware
194 * as of today <= SV810_087), we fallback to old behavior and let OPAL
195 * patch the HMI vector and handle it inside OPAL firmware.
196 *
197 * For newer firmware (in development/yet to be released) we will
198 * start catching/handling HMI directly in Linux.
199 */
200 if (!opal_check_token(OPAL_HANDLE_HMI)) {
201 pr_info("Old firmware detected, OPAL handles HMIs.\n");
202 opal_register_exception_handler(
203 OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
204 0, glue);
205 glue += 128;
206 }
207
208 opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
209 #endif
210
211 return 0;
212 }
213 machine_early_initcall(powernv, opal_register_exception_handlers);
214
215 /*
216 * Opal message notifier based on message type. Allow subscribers to get
217 * notified for specific messgae type.
218 */
219 int opal_message_notifier_register(enum opal_msg_type msg_type,
220 struct notifier_block *nb)
221 {
222 if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) {
223 pr_warning("%s: Invalid arguments, msg_type:%d\n",
224 __func__, msg_type);
225 return -EINVAL;
226 }
227
228 return atomic_notifier_chain_register(
229 &opal_msg_notifier_head[msg_type], nb);
230 }
231 EXPORT_SYMBOL_GPL(opal_message_notifier_register);
232
233 int opal_message_notifier_unregister(enum opal_msg_type msg_type,
234 struct notifier_block *nb)
235 {
236 return atomic_notifier_chain_unregister(
237 &opal_msg_notifier_head[msg_type], nb);
238 }
239 EXPORT_SYMBOL_GPL(opal_message_notifier_unregister);
240
241 static void opal_message_do_notify(uint32_t msg_type, void *msg)
242 {
243 /* notify subscribers */
244 atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type],
245 msg_type, msg);
246 }
247
248 static void opal_handle_message(void)
249 {
250 s64 ret;
251 /*
252 * TODO: pre-allocate a message buffer depending on opal-msg-size
253 * value in /proc/device-tree.
254 */
255 static struct opal_msg msg;
256 u32 type;
257
258 ret = opal_get_msg(__pa(&msg), sizeof(msg));
259 /* No opal message pending. */
260 if (ret == OPAL_RESOURCE)
261 return;
262
263 /* check for errors. */
264 if (ret) {
265 pr_warning("%s: Failed to retrieve opal message, err=%lld\n",
266 __func__, ret);
267 return;
268 }
269
270 type = be32_to_cpu(msg.msg_type);
271
272 /* Sanity check */
273 if (type >= OPAL_MSG_TYPE_MAX) {
274 pr_warn_once("%s: Unknown message type: %u\n", __func__, type);
275 return;
276 }
277 opal_message_do_notify(type, (void *)&msg);
278 }
279
280 static irqreturn_t opal_message_notify(int irq, void *data)
281 {
282 opal_handle_message();
283 return IRQ_HANDLED;
284 }
285
286 static int __init opal_message_init(void)
287 {
288 int ret, i, irq;
289
290 for (i = 0; i < OPAL_MSG_TYPE_MAX; i++)
291 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]);
292
293 irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING));
294 if (!irq) {
295 pr_err("%s: Can't register OPAL event irq (%d)\n",
296 __func__, irq);
297 return irq;
298 }
299
300 ret = request_irq(irq, opal_message_notify,
301 IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL);
302 if (ret) {
303 pr_err("%s: Can't request OPAL event irq (%d)\n",
304 __func__, ret);
305 return ret;
306 }
307
308 return 0;
309 }
310
311 int opal_get_chars(uint32_t vtermno, char *buf, int count)
312 {
313 s64 rc;
314 __be64 evt, len;
315
316 if (!opal.entry)
317 return -ENODEV;
318 opal_poll_events(&evt);
319 if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0)
320 return 0;
321 len = cpu_to_be64(count);
322 rc = opal_console_read(vtermno, &len, buf);
323 if (rc == OPAL_SUCCESS)
324 return be64_to_cpu(len);
325 return 0;
326 }
327
328 int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
329 {
330 int written = 0;
331 __be64 olen;
332 s64 len, rc;
333 unsigned long flags;
334 __be64 evt;
335
336 if (!opal.entry)
337 return -ENODEV;
338
339 /* We want put_chars to be atomic to avoid mangling of hvsi
340 * packets. To do that, we first test for room and return
341 * -EAGAIN if there isn't enough.
342 *
343 * Unfortunately, opal_console_write_buffer_space() doesn't
344 * appear to work on opal v1, so we just assume there is
345 * enough room and be done with it
346 */
347 spin_lock_irqsave(&opal_write_lock, flags);
348 rc = opal_console_write_buffer_space(vtermno, &olen);
349 len = be64_to_cpu(olen);
350 if (rc || len < total_len) {
351 spin_unlock_irqrestore(&opal_write_lock, flags);
352 /* Closed -> drop characters */
353 if (rc)
354 return total_len;
355 opal_poll_events(NULL);
356 return -EAGAIN;
357 }
358
359 /* We still try to handle partial completions, though they
360 * should no longer happen.
361 */
362 rc = OPAL_BUSY;
363 while(total_len > 0 && (rc == OPAL_BUSY ||
364 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
365 olen = cpu_to_be64(total_len);
366 rc = opal_console_write(vtermno, &olen, data);
367 len = be64_to_cpu(olen);
368
369 /* Closed or other error drop */
370 if (rc != OPAL_SUCCESS && rc != OPAL_BUSY &&
371 rc != OPAL_BUSY_EVENT) {
372 written = total_len;
373 break;
374 }
375 if (rc == OPAL_SUCCESS) {
376 total_len -= len;
377 data += len;
378 written += len;
379 }
380 /* This is a bit nasty but we need that for the console to
381 * flush when there aren't any interrupts. We will clean
382 * things a bit later to limit that to synchronous path
383 * such as the kernel console and xmon/udbg
384 */
385 do
386 opal_poll_events(&evt);
387 while(rc == OPAL_SUCCESS &&
388 (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT));
389 }
390 spin_unlock_irqrestore(&opal_write_lock, flags);
391 return written;
392 }
393
394 static int opal_recover_mce(struct pt_regs *regs,
395 struct machine_check_event *evt)
396 {
397 int recovered = 0;
398 uint64_t ea = get_mce_fault_addr(evt);
399
400 if (!(regs->msr & MSR_RI)) {
401 /* If MSR_RI isn't set, we cannot recover */
402 recovered = 0;
403 } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) {
404 /* Platform corrected itself */
405 recovered = 1;
406 } else if (ea && !is_kernel_addr(ea)) {
407 /*
408 * Faulting address is not in kernel text. We should be fine.
409 * We need to find which process uses this address.
410 * For now, kill the task if we have received exception when
411 * in userspace.
412 *
413 * TODO: Queue up this address for hwpoisioning later.
414 */
415 if (user_mode(regs) && !is_global_init(current)) {
416 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
417 recovered = 1;
418 } else
419 recovered = 0;
420 } else if (user_mode(regs) && !is_global_init(current) &&
421 evt->severity == MCE_SEV_ERROR_SYNC) {
422 /*
423 * If we have received a synchronous error when in userspace
424 * kill the task.
425 */
426 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
427 recovered = 1;
428 }
429 return recovered;
430 }
431
432 int opal_machine_check(struct pt_regs *regs)
433 {
434 struct machine_check_event evt;
435 int ret;
436
437 if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
438 return 0;
439
440 /* Print things out */
441 if (evt.version != MCE_V1) {
442 pr_err("Machine Check Exception, Unknown event version %d !\n",
443 evt.version);
444 return 0;
445 }
446 machine_check_print_event_info(&evt);
447
448 if (opal_recover_mce(regs, &evt))
449 return 1;
450
451 /*
452 * Unrecovered machine check, we are heading to panic path.
453 *
454 * We may have hit this MCE in very early stage of kernel
455 * initialization even before opal-prd has started running. If
456 * this is the case then this MCE error may go un-noticed or
457 * un-analyzed if we go down panic path. We need to inform
458 * BMC/OCC about this error so that they can collect relevant
459 * data for error analysis before rebooting.
460 * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so.
461 * This function may not return on BMC based system.
462 */
463 ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR,
464 "Unrecoverable Machine Check exception");
465 if (ret == OPAL_UNSUPPORTED) {
466 pr_emerg("Reboot type %d not supported\n",
467 OPAL_REBOOT_PLATFORM_ERROR);
468 }
469
470 /*
471 * We reached here. There can be three possibilities:
472 * 1. We are running on a firmware level that do not support
473 * opal_cec_reboot2()
474 * 2. We are running on a firmware level that do not support
475 * OPAL_REBOOT_PLATFORM_ERROR reboot type.
476 * 3. We are running on FSP based system that does not need opal
477 * to trigger checkstop explicitly for error analysis. The FSP
478 * PRD component would have already got notified about this
479 * error through other channels.
480 *
481 * If hardware marked this as an unrecoverable MCE, we are
482 * going to panic anyway. Even if it didn't, it's not safe to
483 * continue at this point, so we should explicitly panic.
484 */
485
486 panic("PowerNV Unrecovered Machine Check");
487 return 0;
488 }
489
490 /* Early hmi handler called in real mode. */
491 int opal_hmi_exception_early(struct pt_regs *regs)
492 {
493 s64 rc;
494
495 /*
496 * call opal hmi handler. Pass paca address as token.
497 * The return value OPAL_SUCCESS is an indication that there is
498 * an HMI event generated waiting to pull by Linux.
499 */
500 rc = opal_handle_hmi();
501 if (rc == OPAL_SUCCESS) {
502 local_paca->hmi_event_available = 1;
503 return 1;
504 }
505 return 0;
506 }
507
508 /* HMI exception handler called in virtual mode during check_irq_replay. */
509 int opal_handle_hmi_exception(struct pt_regs *regs)
510 {
511 s64 rc;
512 __be64 evt = 0;
513
514 /*
515 * Check if HMI event is available.
516 * if Yes, then call opal_poll_events to pull opal messages and
517 * process them.
518 */
519 if (!local_paca->hmi_event_available)
520 return 0;
521
522 local_paca->hmi_event_available = 0;
523 rc = opal_poll_events(&evt);
524 if (rc == OPAL_SUCCESS && evt)
525 opal_handle_events(be64_to_cpu(evt));
526
527 return 1;
528 }
529
530 static uint64_t find_recovery_address(uint64_t nip)
531 {
532 int i;
533
534 for (i = 0; i < mc_recoverable_range_len; i++)
535 if ((nip >= mc_recoverable_range[i].start_addr) &&
536 (nip < mc_recoverable_range[i].end_addr))
537 return mc_recoverable_range[i].recover_addr;
538 return 0;
539 }
540
541 bool opal_mce_check_early_recovery(struct pt_regs *regs)
542 {
543 uint64_t recover_addr = 0;
544
545 if (!opal.base || !opal.size)
546 goto out;
547
548 if ((regs->nip >= opal.base) &&
549 (regs->nip < (opal.base + opal.size)))
550 recover_addr = find_recovery_address(regs->nip);
551
552 /*
553 * Setup regs->nip to rfi into fixup address.
554 */
555 if (recover_addr)
556 regs->nip = recover_addr;
557
558 out:
559 return !!recover_addr;
560 }
561
562 static int opal_sysfs_init(void)
563 {
564 opal_kobj = kobject_create_and_add("opal", firmware_kobj);
565 if (!opal_kobj) {
566 pr_warn("kobject_create_and_add opal failed\n");
567 return -ENOMEM;
568 }
569
570 return 0;
571 }
572
573 static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj,
574 struct bin_attribute *bin_attr,
575 char *buf, loff_t off, size_t count)
576 {
577 return memory_read_from_buffer(buf, count, &off, bin_attr->private,
578 bin_attr->size);
579 }
580
581 static BIN_ATTR_RO(symbol_map, 0);
582
583 static void opal_export_symmap(void)
584 {
585 const __be64 *syms;
586 unsigned int size;
587 struct device_node *fw;
588 int rc;
589
590 fw = of_find_node_by_path("/ibm,opal/firmware");
591 if (!fw)
592 return;
593 syms = of_get_property(fw, "symbol-map", &size);
594 if (!syms || size != 2 * sizeof(__be64))
595 return;
596
597 /* Setup attributes */
598 bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0]));
599 bin_attr_symbol_map.size = be64_to_cpu(syms[1]);
600
601 rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map);
602 if (rc)
603 pr_warn("Error %d creating OPAL symbols file\n", rc);
604 }
605
606 static void __init opal_dump_region_init(void)
607 {
608 void *addr;
609 uint64_t size;
610 int rc;
611
612 if (!opal_check_token(OPAL_REGISTER_DUMP_REGION))
613 return;
614
615 /* Register kernel log buffer */
616 addr = log_buf_addr_get();
617 if (addr == NULL)
618 return;
619
620 size = log_buf_len_get();
621 if (size == 0)
622 return;
623
624 rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
625 __pa(addr), size);
626 /* Don't warn if this is just an older OPAL that doesn't
627 * know about that call
628 */
629 if (rc && rc != OPAL_UNSUPPORTED)
630 pr_warn("DUMP: Failed to register kernel log buffer. "
631 "rc = %d\n", rc);
632 }
633
634 static void opal_pdev_init(struct device_node *opal_node,
635 const char *compatible)
636 {
637 struct device_node *np;
638
639 for_each_child_of_node(opal_node, np)
640 if (of_device_is_compatible(np, compatible))
641 of_platform_device_create(np, NULL, NULL);
642 }
643
644 static void opal_i2c_create_devs(void)
645 {
646 struct device_node *np;
647
648 for_each_compatible_node(np, NULL, "ibm,opal-i2c")
649 of_platform_device_create(np, NULL, NULL);
650 }
651
652 static int kopald(void *unused)
653 {
654 unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1;
655 __be64 events;
656
657 set_freezable();
658 do {
659 try_to_freeze();
660 opal_poll_events(&events);
661 opal_handle_events(be64_to_cpu(events));
662 schedule_timeout_interruptible(timeout);
663 } while (!kthread_should_stop());
664
665 return 0;
666 }
667
668 void opal_wake_poller(void)
669 {
670 if (kopald_tsk)
671 wake_up_process(kopald_tsk);
672 }
673
674 static void opal_init_heartbeat(void)
675 {
676 /* Old firwmware, we assume the HVC heartbeat is sufficient */
677 if (of_property_read_u32(opal_node, "ibm,heartbeat-ms",
678 &opal_heartbeat) != 0)
679 opal_heartbeat = 0;
680
681 if (opal_heartbeat)
682 kopald_tsk = kthread_run(kopald, NULL, "kopald");
683 }
684
685 static int __init opal_init(void)
686 {
687 struct device_node *np, *consoles, *leds;
688 int rc;
689
690 opal_node = of_find_node_by_path("/ibm,opal");
691 if (!opal_node) {
692 pr_warn("Device node not found\n");
693 return -ENODEV;
694 }
695
696 /* Register OPAL consoles if any ports */
697 consoles = of_find_node_by_path("/ibm,opal/consoles");
698 if (consoles) {
699 for_each_child_of_node(consoles, np) {
700 if (strcmp(np->name, "serial"))
701 continue;
702 of_platform_device_create(np, NULL, NULL);
703 }
704 of_node_put(consoles);
705 }
706
707 /* Initialise OPAL messaging system */
708 opal_message_init();
709
710 /* Initialise OPAL asynchronous completion interface */
711 opal_async_comp_init();
712
713 /* Initialise OPAL sensor interface */
714 opal_sensor_init();
715
716 /* Initialise OPAL hypervisor maintainence interrupt handling */
717 opal_hmi_handler_init();
718
719 /* Create i2c platform devices */
720 opal_i2c_create_devs();
721
722 /* Setup a heatbeat thread if requested by OPAL */
723 opal_init_heartbeat();
724
725 /* Create leds platform devices */
726 leds = of_find_node_by_path("/ibm,opal/leds");
727 if (leds) {
728 of_platform_device_create(leds, "opal_leds", NULL);
729 of_node_put(leds);
730 }
731
732 /* Initialise OPAL message log interface */
733 opal_msglog_init();
734
735 /* Create "opal" kobject under /sys/firmware */
736 rc = opal_sysfs_init();
737 if (rc == 0) {
738 /* Export symbol map to userspace */
739 opal_export_symmap();
740 /* Setup dump region interface */
741 opal_dump_region_init();
742 /* Setup error log interface */
743 rc = opal_elog_init();
744 /* Setup code update interface */
745 opal_flash_update_init();
746 /* Setup platform dump extract interface */
747 opal_platform_dump_init();
748 /* Setup system parameters interface */
749 opal_sys_param_init();
750 /* Setup message log sysfs interface. */
751 opal_msglog_sysfs_init();
752 }
753
754 /* Initialize platform devices: IPMI backend, PRD & flash interface */
755 opal_pdev_init(opal_node, "ibm,opal-ipmi");
756 opal_pdev_init(opal_node, "ibm,opal-flash");
757 opal_pdev_init(opal_node, "ibm,opal-prd");
758
759 /* Initialise platform device: oppanel interface */
760 opal_pdev_init(opal_node, "ibm,opal-oppanel");
761
762 /* Initialise OPAL kmsg dumper for flushing console on panic */
763 opal_kmsg_init();
764
765 return 0;
766 }
767 machine_subsys_initcall(powernv, opal_init);
768
769 void opal_shutdown(void)
770 {
771 long rc = OPAL_BUSY;
772
773 opal_event_shutdown();
774
775 /*
776 * Then sync with OPAL which ensure anything that can
777 * potentially write to our memory has completed such
778 * as an ongoing dump retrieval
779 */
780 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
781 rc = opal_sync_host_reboot();
782 if (rc == OPAL_BUSY)
783 opal_poll_events(NULL);
784 else
785 mdelay(10);
786 }
787
788 /* Unregister memory dump region */
789 if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION))
790 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF);
791 }
792
793 /* Export this so that test modules can use it */
794 EXPORT_SYMBOL_GPL(opal_invalid_call);
795 EXPORT_SYMBOL_GPL(opal_xscom_read);
796 EXPORT_SYMBOL_GPL(opal_xscom_write);
797 EXPORT_SYMBOL_GPL(opal_ipmi_send);
798 EXPORT_SYMBOL_GPL(opal_ipmi_recv);
799 EXPORT_SYMBOL_GPL(opal_flash_read);
800 EXPORT_SYMBOL_GPL(opal_flash_write);
801 EXPORT_SYMBOL_GPL(opal_flash_erase);
802 EXPORT_SYMBOL_GPL(opal_prd_msg);
803
804 /* Convert a region of vmalloc memory to an opal sg list */
805 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
806 unsigned long vmalloc_size)
807 {
808 struct opal_sg_list *sg, *first = NULL;
809 unsigned long i = 0;
810
811 sg = kzalloc(PAGE_SIZE, GFP_KERNEL);
812 if (!sg)
813 goto nomem;
814
815 first = sg;
816
817 while (vmalloc_size > 0) {
818 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT;
819 uint64_t length = min(vmalloc_size, PAGE_SIZE);
820
821 sg->entry[i].data = cpu_to_be64(data);
822 sg->entry[i].length = cpu_to_be64(length);
823 i++;
824
825 if (i >= SG_ENTRIES_PER_NODE) {
826 struct opal_sg_list *next;
827
828 next = kzalloc(PAGE_SIZE, GFP_KERNEL);
829 if (!next)
830 goto nomem;
831
832 sg->length = cpu_to_be64(
833 i * sizeof(struct opal_sg_entry) + 16);
834 i = 0;
835 sg->next = cpu_to_be64(__pa(next));
836 sg = next;
837 }
838
839 vmalloc_addr += length;
840 vmalloc_size -= length;
841 }
842
843 sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16);
844
845 return first;
846
847 nomem:
848 pr_err("%s : Failed to allocate memory\n", __func__);
849 opal_free_sg_list(first);
850 return NULL;
851 }
852
853 void opal_free_sg_list(struct opal_sg_list *sg)
854 {
855 while (sg) {
856 uint64_t next = be64_to_cpu(sg->next);
857
858 kfree(sg);
859
860 if (next)
861 sg = __va(next);
862 else
863 sg = NULL;
864 }
865 }
866
867 int opal_error_code(int rc)
868 {
869 switch (rc) {
870 case OPAL_SUCCESS: return 0;
871
872 case OPAL_PARAMETER: return -EINVAL;
873 case OPAL_ASYNC_COMPLETION: return -EINPROGRESS;
874 case OPAL_BUSY_EVENT: return -EBUSY;
875 case OPAL_NO_MEM: return -ENOMEM;
876 case OPAL_PERMISSION: return -EPERM;
877
878 case OPAL_UNSUPPORTED: return -EIO;
879 case OPAL_HARDWARE: return -EIO;
880 case OPAL_INTERNAL_ERROR: return -EIO;
881 default:
882 pr_err("%s: unexpected OPAL error %d\n", __func__, rc);
883 return -EIO;
884 }
885 }
886
887 EXPORT_SYMBOL_GPL(opal_poll_events);
888 EXPORT_SYMBOL_GPL(opal_rtc_read);
889 EXPORT_SYMBOL_GPL(opal_rtc_write);
890 EXPORT_SYMBOL_GPL(opal_tpo_read);
891 EXPORT_SYMBOL_GPL(opal_tpo_write);
892 EXPORT_SYMBOL_GPL(opal_i2c_request);
893 /* Export these symbols for PowerNV LED class driver */
894 EXPORT_SYMBOL_GPL(opal_leds_get_ind);
895 EXPORT_SYMBOL_GPL(opal_leds_set_ind);
896 /* Export this symbol for PowerNV Operator Panel class driver */
897 EXPORT_SYMBOL_GPL(opal_write_oppanel_async);
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