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/of_address.h>
20 #include <linux/interrupt.h>
21 #include <linux/notifier.h>
22 #include <linux/slab.h>
23 #include <linux/sched.h>
24 #include <linux/kobject.h>
25 #include <linux/delay.h>
26 #include <linux/memblock.h>
27 #include <linux/kthread.h>
28 #include <linux/freezer.h>
29 #include <linux/printk.h>
30 #include <linux/kmsg_dump.h>
31 #include <linux/console.h>
32 #include <linux/sched/debug.h>
33
34 #include <asm/machdep.h>
35 #include <asm/opal.h>
36 #include <asm/firmware.h>
37 #include <asm/mce.h>
38 #include <asm/imc-pmu.h>
39 #include <asm/bug.h>
40
41 #include "powernv.h"
42
43 /* /sys/firmware/opal */
44 struct kobject *opal_kobj;
45
46 struct opal {
47 u64 base;
48 u64 entry;
49 u64 size;
50 } opal;
51
52 struct mcheck_recoverable_range {
53 u64 start_addr;
54 u64 end_addr;
55 u64 recover_addr;
56 };
57
58 static struct mcheck_recoverable_range *mc_recoverable_range;
59 static int mc_recoverable_range_len;
60
61 struct device_node *opal_node;
62 static DEFINE_SPINLOCK(opal_write_lock);
63 static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX];
64 static uint32_t opal_heartbeat;
65 static struct task_struct *kopald_tsk;
66
opal_configure_cores(void)67 void opal_configure_cores(void)
68 {
69 u64 reinit_flags = 0;
70
71 /* Do the actual re-init, This will clobber all FPRs, VRs, etc...
72 *
73 * It will preserve non volatile GPRs and HSPRG0/1. It will
74 * also restore HIDs and other SPRs to their original value
75 * but it might clobber a bunch.
76 */
77 #ifdef __BIG_ENDIAN__
78 reinit_flags |= OPAL_REINIT_CPUS_HILE_BE;
79 #else
80 reinit_flags |= OPAL_REINIT_CPUS_HILE_LE;
81 #endif
82
83 /*
84 * POWER9 always support running hash:
85 * ie. Host hash supports hash guests
86 * Host radix supports hash/radix guests
87 */
88 if (early_cpu_has_feature(CPU_FTR_ARCH_300)) {
89 reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH;
90 if (early_radix_enabled())
91 reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX;
92 }
93
94 opal_reinit_cpus(reinit_flags);
95
96 /* Restore some bits */
97 if (cur_cpu_spec->cpu_restore)
98 cur_cpu_spec->cpu_restore();
99 }
100
early_init_dt_scan_opal(unsigned long node,const char * uname,int depth,void * data)101 int __init early_init_dt_scan_opal(unsigned long node,
102 const char *uname, int depth, void *data)
103 {
104 const void *basep, *entryp, *sizep;
105 int basesz, entrysz, runtimesz;
106
107 if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
108 return 0;
109
110 basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
111 entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);
112 sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz);
113
114 if (!basep || !entryp || !sizep)
115 return 1;
116
117 opal.base = of_read_number(basep, basesz/4);
118 opal.entry = of_read_number(entryp, entrysz/4);
119 opal.size = of_read_number(sizep, runtimesz/4);
120
121 pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n",
122 opal.base, basep, basesz);
123 pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n",
124 opal.entry, entryp, entrysz);
125 pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n",
126 opal.size, sizep, runtimesz);
127
128 if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
129 powerpc_firmware_features |= FW_FEATURE_OPAL;
130 pr_info("OPAL detected !\n");
131 } else {
132 panic("OPAL != V3 detected, no longer supported.\n");
133 }
134
135 return 1;
136 }
137
early_init_dt_scan_recoverable_ranges(unsigned long node,const char * uname,int depth,void * data)138 int __init early_init_dt_scan_recoverable_ranges(unsigned long node,
139 const char *uname, int depth, void *data)
140 {
141 int i, psize, size;
142 const __be32 *prop;
143
144 if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
145 return 0;
146
147 prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize);
148
149 if (!prop)
150 return 1;
151
152 pr_debug("Found machine check recoverable ranges.\n");
153
154 /*
155 * Calculate number of available entries.
156 *
157 * Each recoverable address range entry is (start address, len,
158 * recovery address), 2 cells each for start and recovery address,
159 * 1 cell for len, totalling 5 cells per entry.
160 */
161 mc_recoverable_range_len = psize / (sizeof(*prop) * 5);
162
163 /* Sanity check */
164 if (!mc_recoverable_range_len)
165 return 1;
166
167 /* Size required to hold all the entries. */
168 size = mc_recoverable_range_len *
169 sizeof(struct mcheck_recoverable_range);
170
171 /*
172 * Allocate a buffer to hold the MC recoverable ranges.
173 */
174 mc_recoverable_range =__va(memblock_alloc(size, __alignof__(u64)));
175 memset(mc_recoverable_range, 0, size);
176
177 for (i = 0; i < mc_recoverable_range_len; i++) {
178 mc_recoverable_range[i].start_addr =
179 of_read_number(prop + (i * 5) + 0, 2);
180 mc_recoverable_range[i].end_addr =
181 mc_recoverable_range[i].start_addr +
182 of_read_number(prop + (i * 5) + 2, 1);
183 mc_recoverable_range[i].recover_addr =
184 of_read_number(prop + (i * 5) + 3, 2);
185
186 pr_debug("Machine check recoverable range: %llx..%llx: %llx\n",
187 mc_recoverable_range[i].start_addr,
188 mc_recoverable_range[i].end_addr,
189 mc_recoverable_range[i].recover_addr);
190 }
191 return 1;
192 }
193
opal_register_exception_handlers(void)194 static int __init opal_register_exception_handlers(void)
195 {
196 #ifdef __BIG_ENDIAN__
197 u64 glue;
198
199 if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
200 return -ENODEV;
201
202 /* Hookup some exception handlers except machine check. We use the
203 * fwnmi area at 0x7000 to provide the glue space to OPAL
204 */
205 glue = 0x7000;
206
207 /*
208 * Check if we are running on newer firmware that exports
209 * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch
210 * the HMI interrupt and we catch it directly in Linux.
211 *
212 * For older firmware (i.e currently released POWER8 System Firmware
213 * as of today <= SV810_087), we fallback to old behavior and let OPAL
214 * patch the HMI vector and handle it inside OPAL firmware.
215 *
216 * For newer firmware (in development/yet to be released) we will
217 * start catching/handling HMI directly in Linux.
218 */
219 if (!opal_check_token(OPAL_HANDLE_HMI)) {
220 pr_info("Old firmware detected, OPAL handles HMIs.\n");
221 opal_register_exception_handler(
222 OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
223 0, glue);
224 glue += 128;
225 }
226
227 opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
228 #endif
229
230 return 0;
231 }
232 machine_early_initcall(powernv, opal_register_exception_handlers);
233
234 /*
235 * Opal message notifier based on message type. Allow subscribers to get
236 * notified for specific messgae type.
237 */
opal_message_notifier_register(enum opal_msg_type msg_type,struct notifier_block * nb)238 int opal_message_notifier_register(enum opal_msg_type msg_type,
239 struct notifier_block *nb)
240 {
241 if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) {
242 pr_warning("%s: Invalid arguments, msg_type:%d\n",
243 __func__, msg_type);
244 return -EINVAL;
245 }
246
247 return atomic_notifier_chain_register(
248 &opal_msg_notifier_head[msg_type], nb);
249 }
250 EXPORT_SYMBOL_GPL(opal_message_notifier_register);
251
opal_message_notifier_unregister(enum opal_msg_type msg_type,struct notifier_block * nb)252 int opal_message_notifier_unregister(enum opal_msg_type msg_type,
253 struct notifier_block *nb)
254 {
255 return atomic_notifier_chain_unregister(
256 &opal_msg_notifier_head[msg_type], nb);
257 }
258 EXPORT_SYMBOL_GPL(opal_message_notifier_unregister);
259
opal_message_do_notify(uint32_t msg_type,void * msg)260 static void opal_message_do_notify(uint32_t msg_type, void *msg)
261 {
262 /* notify subscribers */
263 atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type],
264 msg_type, msg);
265 }
266
opal_handle_message(void)267 static void opal_handle_message(void)
268 {
269 s64 ret;
270 /*
271 * TODO: pre-allocate a message buffer depending on opal-msg-size
272 * value in /proc/device-tree.
273 */
274 static struct opal_msg msg;
275 u32 type;
276
277 ret = opal_get_msg(__pa(&msg), sizeof(msg));
278 /* No opal message pending. */
279 if (ret == OPAL_RESOURCE)
280 return;
281
282 /* check for errors. */
283 if (ret) {
284 pr_warning("%s: Failed to retrieve opal message, err=%lld\n",
285 __func__, ret);
286 return;
287 }
288
289 type = be32_to_cpu(msg.msg_type);
290
291 /* Sanity check */
292 if (type >= OPAL_MSG_TYPE_MAX) {
293 pr_warn_once("%s: Unknown message type: %u\n", __func__, type);
294 return;
295 }
296 opal_message_do_notify(type, (void *)&msg);
297 }
298
opal_message_notify(int irq,void * data)299 static irqreturn_t opal_message_notify(int irq, void *data)
300 {
301 opal_handle_message();
302 return IRQ_HANDLED;
303 }
304
opal_message_init(void)305 static int __init opal_message_init(void)
306 {
307 int ret, i, irq;
308
309 for (i = 0; i < OPAL_MSG_TYPE_MAX; i++)
310 ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]);
311
312 irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING));
313 if (!irq) {
314 pr_err("%s: Can't register OPAL event irq (%d)\n",
315 __func__, irq);
316 return irq;
317 }
318
319 ret = request_irq(irq, opal_message_notify,
320 IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL);
321 if (ret) {
322 pr_err("%s: Can't request OPAL event irq (%d)\n",
323 __func__, ret);
324 return ret;
325 }
326
327 return 0;
328 }
329
opal_get_chars(uint32_t vtermno,char * buf,int count)330 int opal_get_chars(uint32_t vtermno, char *buf, int count)
331 {
332 s64 rc;
333 __be64 evt, len;
334
335 if (!opal.entry)
336 return -ENODEV;
337 opal_poll_events(&evt);
338 if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0)
339 return 0;
340 len = cpu_to_be64(count);
341 rc = opal_console_read(vtermno, &len, buf);
342 if (rc == OPAL_SUCCESS)
343 return be64_to_cpu(len);
344 return 0;
345 }
346
opal_put_chars(uint32_t vtermno,const char * data,int total_len)347 int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
348 {
349 int written = 0;
350 __be64 olen;
351 s64 len, rc;
352 unsigned long flags;
353 __be64 evt;
354
355 if (!opal.entry)
356 return -ENODEV;
357
358 /* We want put_chars to be atomic to avoid mangling of hvsi
359 * packets. To do that, we first test for room and return
360 * -EAGAIN if there isn't enough.
361 *
362 * Unfortunately, opal_console_write_buffer_space() doesn't
363 * appear to work on opal v1, so we just assume there is
364 * enough room and be done with it
365 */
366 spin_lock_irqsave(&opal_write_lock, flags);
367 rc = opal_console_write_buffer_space(vtermno, &olen);
368 len = be64_to_cpu(olen);
369 if (rc || len < total_len) {
370 spin_unlock_irqrestore(&opal_write_lock, flags);
371 /* Closed -> drop characters */
372 if (rc)
373 return total_len;
374 opal_poll_events(NULL);
375 return -EAGAIN;
376 }
377
378 /* We still try to handle partial completions, though they
379 * should no longer happen.
380 */
381 rc = OPAL_BUSY;
382 while(total_len > 0 && (rc == OPAL_BUSY ||
383 rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
384 olen = cpu_to_be64(total_len);
385 rc = opal_console_write(vtermno, &olen, data);
386 len = be64_to_cpu(olen);
387
388 /* Closed or other error drop */
389 if (rc != OPAL_SUCCESS && rc != OPAL_BUSY &&
390 rc != OPAL_BUSY_EVENT) {
391 written += total_len;
392 break;
393 }
394 if (rc == OPAL_SUCCESS) {
395 total_len -= len;
396 data += len;
397 written += len;
398 }
399 /* This is a bit nasty but we need that for the console to
400 * flush when there aren't any interrupts. We will clean
401 * things a bit later to limit that to synchronous path
402 * such as the kernel console and xmon/udbg
403 */
404 do
405 opal_poll_events(&evt);
406 while(rc == OPAL_SUCCESS &&
407 (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT));
408 }
409 spin_unlock_irqrestore(&opal_write_lock, flags);
410 return written;
411 }
412
opal_recover_mce(struct pt_regs * regs,struct machine_check_event * evt)413 static int opal_recover_mce(struct pt_regs *regs,
414 struct machine_check_event *evt)
415 {
416 int recovered = 0;
417
418 if (!(regs->msr & MSR_RI)) {
419 /* If MSR_RI isn't set, we cannot recover */
420 pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n");
421 recovered = 0;
422 } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) {
423 /* Platform corrected itself */
424 recovered = 1;
425 } else if (evt->severity == MCE_SEV_FATAL) {
426 /* Fatal machine check */
427 pr_err("Machine check interrupt is fatal\n");
428 recovered = 0;
429 }
430
431 if (!recovered && evt->severity == MCE_SEV_ERROR_SYNC) {
432 /*
433 * Try to kill processes if we get a synchronous machine check
434 * (e.g., one caused by execution of this instruction). This
435 * will devolve into a panic if we try to kill init or are in
436 * an interrupt etc.
437 *
438 * TODO: Queue up this address for hwpoisioning later.
439 * TODO: This is not quite right for d-side machine
440 * checks ->nip is not necessarily the important
441 * address.
442 */
443 if ((user_mode(regs))) {
444 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
445 recovered = 1;
446 } else if (die_will_crash()) {
447 /*
448 * die() would kill the kernel, so better to go via
449 * the platform reboot code that will log the
450 * machine check.
451 */
452 recovered = 0;
453 } else {
454 die("Machine check", regs, SIGBUS);
455 recovered = 1;
456 }
457 }
458
459 return recovered;
460 }
461
pnv_platform_error_reboot(struct pt_regs * regs,const char * msg)462 void pnv_platform_error_reboot(struct pt_regs *regs, const char *msg)
463 {
464 /*
465 * This is mostly taken from kernel/panic.c, but tries to do
466 * relatively minimal work. Don't use delay functions (TB may
467 * be broken), don't crash dump (need to set a firmware log),
468 * don't run notifiers. We do want to get some information to
469 * Linux console.
470 */
471 console_verbose();
472 bust_spinlocks(1);
473 pr_emerg("Hardware platform error: %s\n", msg);
474 if (regs)
475 show_regs(regs);
476 smp_send_stop();
477 printk_safe_flush_on_panic();
478 kmsg_dump(KMSG_DUMP_PANIC);
479 bust_spinlocks(0);
480 debug_locks_off();
481 console_flush_on_panic();
482
483 /*
484 * Don't bother to shut things down because this will
485 * xstop the system.
486 */
487 if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg)
488 == OPAL_UNSUPPORTED) {
489 pr_emerg("Reboot type %d not supported for %s\n",
490 OPAL_REBOOT_PLATFORM_ERROR, msg);
491 }
492
493 /*
494 * We reached here. There can be three possibilities:
495 * 1. We are running on a firmware level that do not support
496 * opal_cec_reboot2()
497 * 2. We are running on a firmware level that do not support
498 * OPAL_REBOOT_PLATFORM_ERROR reboot type.
499 * 3. We are running on FSP based system that does not need
500 * opal to trigger checkstop explicitly for error analysis.
501 * The FSP PRD component would have already got notified
502 * about this error through other channels.
503 */
504
505 ppc_md.restart(NULL);
506 }
507
opal_machine_check(struct pt_regs * regs)508 int opal_machine_check(struct pt_regs *regs)
509 {
510 struct machine_check_event evt;
511
512 if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
513 return 0;
514
515 /* Print things out */
516 if (evt.version != MCE_V1) {
517 pr_err("Machine Check Exception, Unknown event version %d !\n",
518 evt.version);
519 return 0;
520 }
521 machine_check_print_event_info(&evt, user_mode(regs));
522
523 if (opal_recover_mce(regs, &evt))
524 return 1;
525
526 pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception");
527 }
528
529 /* Early hmi handler called in real mode. */
opal_hmi_exception_early(struct pt_regs * regs)530 int opal_hmi_exception_early(struct pt_regs *regs)
531 {
532 s64 rc;
533
534 /*
535 * call opal hmi handler. Pass paca address as token.
536 * The return value OPAL_SUCCESS is an indication that there is
537 * an HMI event generated waiting to pull by Linux.
538 */
539 rc = opal_handle_hmi();
540 if (rc == OPAL_SUCCESS) {
541 local_paca->hmi_event_available = 1;
542 return 1;
543 }
544 return 0;
545 }
546
547 /* HMI exception handler called in virtual mode during check_irq_replay. */
opal_handle_hmi_exception(struct pt_regs * regs)548 int opal_handle_hmi_exception(struct pt_regs *regs)
549 {
550 s64 rc;
551 __be64 evt = 0;
552
553 /*
554 * Check if HMI event is available.
555 * if Yes, then call opal_poll_events to pull opal messages and
556 * process them.
557 */
558 if (!local_paca->hmi_event_available)
559 return 0;
560
561 local_paca->hmi_event_available = 0;
562 rc = opal_poll_events(&evt);
563 if (rc == OPAL_SUCCESS && evt)
564 opal_handle_events(be64_to_cpu(evt));
565
566 return 1;
567 }
568
find_recovery_address(uint64_t nip)569 static uint64_t find_recovery_address(uint64_t nip)
570 {
571 int i;
572
573 for (i = 0; i < mc_recoverable_range_len; i++)
574 if ((nip >= mc_recoverable_range[i].start_addr) &&
575 (nip < mc_recoverable_range[i].end_addr))
576 return mc_recoverable_range[i].recover_addr;
577 return 0;
578 }
579
opal_mce_check_early_recovery(struct pt_regs * regs)580 bool opal_mce_check_early_recovery(struct pt_regs *regs)
581 {
582 uint64_t recover_addr = 0;
583
584 if (!opal.base || !opal.size)
585 goto out;
586
587 if ((regs->nip >= opal.base) &&
588 (regs->nip < (opal.base + opal.size)))
589 recover_addr = find_recovery_address(regs->nip);
590
591 /*
592 * Setup regs->nip to rfi into fixup address.
593 */
594 if (recover_addr)
595 regs->nip = recover_addr;
596
597 out:
598 return !!recover_addr;
599 }
600
opal_sysfs_init(void)601 static int opal_sysfs_init(void)
602 {
603 opal_kobj = kobject_create_and_add("opal", firmware_kobj);
604 if (!opal_kobj) {
605 pr_warn("kobject_create_and_add opal failed\n");
606 return -ENOMEM;
607 }
608
609 return 0;
610 }
611
symbol_map_read(struct file * fp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)612 static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj,
613 struct bin_attribute *bin_attr,
614 char *buf, loff_t off, size_t count)
615 {
616 return memory_read_from_buffer(buf, count, &off, bin_attr->private,
617 bin_attr->size);
618 }
619
620 static struct bin_attribute symbol_map_attr = {
621 .attr = {.name = "symbol_map", .mode = 0400},
622 .read = symbol_map_read
623 };
624
opal_export_symmap(void)625 static void opal_export_symmap(void)
626 {
627 const __be64 *syms;
628 unsigned int size;
629 struct device_node *fw;
630 int rc;
631
632 fw = of_find_node_by_path("/ibm,opal/firmware");
633 if (!fw)
634 return;
635 syms = of_get_property(fw, "symbol-map", &size);
636 if (!syms || size != 2 * sizeof(__be64))
637 return;
638
639 /* Setup attributes */
640 symbol_map_attr.private = __va(be64_to_cpu(syms[0]));
641 symbol_map_attr.size = be64_to_cpu(syms[1]);
642
643 rc = sysfs_create_bin_file(opal_kobj, &symbol_map_attr);
644 if (rc)
645 pr_warn("Error %d creating OPAL symbols file\n", rc);
646 }
647
export_attr_read(struct file * fp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)648 static ssize_t export_attr_read(struct file *fp, struct kobject *kobj,
649 struct bin_attribute *bin_attr, char *buf,
650 loff_t off, size_t count)
651 {
652 return memory_read_from_buffer(buf, count, &off, bin_attr->private,
653 bin_attr->size);
654 }
655
656 /*
657 * opal_export_attrs: creates a sysfs node for each property listed in
658 * the device-tree under /ibm,opal/firmware/exports/
659 * All new sysfs nodes are created under /opal/exports/.
660 * This allows for reserved memory regions (e.g. HDAT) to be read.
661 * The new sysfs nodes are only readable by root.
662 */
opal_export_attrs(void)663 static void opal_export_attrs(void)
664 {
665 struct bin_attribute *attr;
666 struct device_node *np;
667 struct property *prop;
668 struct kobject *kobj;
669 u64 vals[2];
670 int rc;
671
672 np = of_find_node_by_path("/ibm,opal/firmware/exports");
673 if (!np)
674 return;
675
676 /* Create new 'exports' directory - /sys/firmware/opal/exports */
677 kobj = kobject_create_and_add("exports", opal_kobj);
678 if (!kobj) {
679 pr_warn("kobject_create_and_add() of exports failed\n");
680 return;
681 }
682
683 for_each_property_of_node(np, prop) {
684 if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle"))
685 continue;
686
687 if (of_property_read_u64_array(np, prop->name, &vals[0], 2))
688 continue;
689
690 attr = kzalloc(sizeof(*attr), GFP_KERNEL);
691
692 if (attr == NULL) {
693 pr_warn("Failed kmalloc for bin_attribute!");
694 continue;
695 }
696
697 sysfs_bin_attr_init(attr);
698 attr->attr.name = kstrdup(prop->name, GFP_KERNEL);
699 attr->attr.mode = 0400;
700 attr->read = export_attr_read;
701 attr->private = __va(vals[0]);
702 attr->size = vals[1];
703
704 if (attr->attr.name == NULL) {
705 pr_warn("Failed kstrdup for bin_attribute attr.name");
706 kfree(attr);
707 continue;
708 }
709
710 rc = sysfs_create_bin_file(kobj, attr);
711 if (rc) {
712 pr_warn("Error %d creating OPAL sysfs exports/%s file\n",
713 rc, prop->name);
714 kfree(attr->attr.name);
715 kfree(attr);
716 }
717 }
718
719 of_node_put(np);
720 }
721
opal_dump_region_init(void)722 static void __init opal_dump_region_init(void)
723 {
724 void *addr;
725 uint64_t size;
726 int rc;
727
728 if (!opal_check_token(OPAL_REGISTER_DUMP_REGION))
729 return;
730
731 /* Register kernel log buffer */
732 addr = log_buf_addr_get();
733 if (addr == NULL)
734 return;
735
736 size = log_buf_len_get();
737 if (size == 0)
738 return;
739
740 rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
741 __pa(addr), size);
742 /* Don't warn if this is just an older OPAL that doesn't
743 * know about that call
744 */
745 if (rc && rc != OPAL_UNSUPPORTED)
746 pr_warn("DUMP: Failed to register kernel log buffer. "
747 "rc = %d\n", rc);
748 }
749
opal_pdev_init(const char * compatible)750 static void opal_pdev_init(const char *compatible)
751 {
752 struct device_node *np;
753
754 for_each_compatible_node(np, NULL, compatible)
755 of_platform_device_create(np, NULL, NULL);
756 }
757
opal_imc_init_dev(void)758 static void __init opal_imc_init_dev(void)
759 {
760 struct device_node *np;
761
762 np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT);
763 if (np)
764 of_platform_device_create(np, NULL, NULL);
765 }
766
kopald(void * unused)767 static int kopald(void *unused)
768 {
769 unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1;
770 __be64 events;
771
772 set_freezable();
773 do {
774 try_to_freeze();
775 opal_poll_events(&events);
776 opal_handle_events(be64_to_cpu(events));
777 schedule_timeout_interruptible(timeout);
778 } while (!kthread_should_stop());
779
780 return 0;
781 }
782
opal_wake_poller(void)783 void opal_wake_poller(void)
784 {
785 if (kopald_tsk)
786 wake_up_process(kopald_tsk);
787 }
788
opal_init_heartbeat(void)789 static void opal_init_heartbeat(void)
790 {
791 /* Old firwmware, we assume the HVC heartbeat is sufficient */
792 if (of_property_read_u32(opal_node, "ibm,heartbeat-ms",
793 &opal_heartbeat) != 0)
794 opal_heartbeat = 0;
795
796 if (opal_heartbeat)
797 kopald_tsk = kthread_run(kopald, NULL, "kopald");
798 }
799
opal_init(void)800 static int __init opal_init(void)
801 {
802 struct device_node *np, *consoles, *leds;
803 int rc;
804
805 opal_node = of_find_node_by_path("/ibm,opal");
806 if (!opal_node) {
807 pr_warn("Device node not found\n");
808 return -ENODEV;
809 }
810
811 /* Register OPAL consoles if any ports */
812 consoles = of_find_node_by_path("/ibm,opal/consoles");
813 if (consoles) {
814 for_each_child_of_node(consoles, np) {
815 if (strcmp(np->name, "serial"))
816 continue;
817 of_platform_device_create(np, NULL, NULL);
818 }
819 of_node_put(consoles);
820 }
821
822 /* Initialise OPAL messaging system */
823 opal_message_init();
824
825 /* Initialise OPAL asynchronous completion interface */
826 opal_async_comp_init();
827
828 /* Initialise OPAL sensor interface */
829 opal_sensor_init();
830
831 /* Initialise OPAL hypervisor maintainence interrupt handling */
832 opal_hmi_handler_init();
833
834 /* Create i2c platform devices */
835 opal_pdev_init("ibm,opal-i2c");
836
837 /* Setup a heatbeat thread if requested by OPAL */
838 opal_init_heartbeat();
839
840 /* Detect In-Memory Collection counters and create devices*/
841 opal_imc_init_dev();
842
843 /* Create leds platform devices */
844 leds = of_find_node_by_path("/ibm,opal/leds");
845 if (leds) {
846 of_platform_device_create(leds, "opal_leds", NULL);
847 of_node_put(leds);
848 }
849
850 /* Initialise OPAL message log interface */
851 opal_msglog_init();
852
853 /* Create "opal" kobject under /sys/firmware */
854 rc = opal_sysfs_init();
855 if (rc == 0) {
856 /* Export symbol map to userspace */
857 opal_export_symmap();
858 /* Setup dump region interface */
859 opal_dump_region_init();
860 /* Setup error log interface */
861 rc = opal_elog_init();
862 /* Setup code update interface */
863 opal_flash_update_init();
864 /* Setup platform dump extract interface */
865 opal_platform_dump_init();
866 /* Setup system parameters interface */
867 opal_sys_param_init();
868 /* Setup message log sysfs interface. */
869 opal_msglog_sysfs_init();
870 }
871
872 /* Export all properties */
873 opal_export_attrs();
874
875 /* Initialize platform devices: IPMI backend, PRD & flash interface */
876 opal_pdev_init("ibm,opal-ipmi");
877 opal_pdev_init("ibm,opal-flash");
878 opal_pdev_init("ibm,opal-prd");
879
880 /* Initialise platform device: oppanel interface */
881 opal_pdev_init("ibm,opal-oppanel");
882
883 /* Initialise OPAL kmsg dumper for flushing console on panic */
884 opal_kmsg_init();
885
886 /* Initialise OPAL powercap interface */
887 opal_powercap_init();
888
889 /* Initialise OPAL Power-Shifting-Ratio interface */
890 opal_psr_init();
891
892 /* Initialise OPAL sensor groups */
893 opal_sensor_groups_init();
894
895 return 0;
896 }
897 machine_subsys_initcall(powernv, opal_init);
898
opal_shutdown(void)899 void opal_shutdown(void)
900 {
901 long rc = OPAL_BUSY;
902
903 opal_event_shutdown();
904
905 /*
906 * Then sync with OPAL which ensure anything that can
907 * potentially write to our memory has completed such
908 * as an ongoing dump retrieval
909 */
910 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
911 rc = opal_sync_host_reboot();
912 if (rc == OPAL_BUSY)
913 opal_poll_events(NULL);
914 else
915 mdelay(10);
916 }
917
918 /* Unregister memory dump region */
919 if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION))
920 opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF);
921 }
922
923 /* Export this so that test modules can use it */
924 EXPORT_SYMBOL_GPL(opal_invalid_call);
925 EXPORT_SYMBOL_GPL(opal_xscom_read);
926 EXPORT_SYMBOL_GPL(opal_xscom_write);
927 EXPORT_SYMBOL_GPL(opal_ipmi_send);
928 EXPORT_SYMBOL_GPL(opal_ipmi_recv);
929 EXPORT_SYMBOL_GPL(opal_flash_read);
930 EXPORT_SYMBOL_GPL(opal_flash_write);
931 EXPORT_SYMBOL_GPL(opal_flash_erase);
932 EXPORT_SYMBOL_GPL(opal_prd_msg);
933
934 /* Convert a region of vmalloc memory to an opal sg list */
opal_vmalloc_to_sg_list(void * vmalloc_addr,unsigned long vmalloc_size)935 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
936 unsigned long vmalloc_size)
937 {
938 struct opal_sg_list *sg, *first = NULL;
939 unsigned long i = 0;
940
941 sg = kzalloc(PAGE_SIZE, GFP_KERNEL);
942 if (!sg)
943 goto nomem;
944
945 first = sg;
946
947 while (vmalloc_size > 0) {
948 uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT;
949 uint64_t length = min(vmalloc_size, PAGE_SIZE);
950
951 sg->entry[i].data = cpu_to_be64(data);
952 sg->entry[i].length = cpu_to_be64(length);
953 i++;
954
955 if (i >= SG_ENTRIES_PER_NODE) {
956 struct opal_sg_list *next;
957
958 next = kzalloc(PAGE_SIZE, GFP_KERNEL);
959 if (!next)
960 goto nomem;
961
962 sg->length = cpu_to_be64(
963 i * sizeof(struct opal_sg_entry) + 16);
964 i = 0;
965 sg->next = cpu_to_be64(__pa(next));
966 sg = next;
967 }
968
969 vmalloc_addr += length;
970 vmalloc_size -= length;
971 }
972
973 sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16);
974
975 return first;
976
977 nomem:
978 pr_err("%s : Failed to allocate memory\n", __func__);
979 opal_free_sg_list(first);
980 return NULL;
981 }
982
opal_free_sg_list(struct opal_sg_list * sg)983 void opal_free_sg_list(struct opal_sg_list *sg)
984 {
985 while (sg) {
986 uint64_t next = be64_to_cpu(sg->next);
987
988 kfree(sg);
989
990 if (next)
991 sg = __va(next);
992 else
993 sg = NULL;
994 }
995 }
996
opal_error_code(int rc)997 int opal_error_code(int rc)
998 {
999 switch (rc) {
1000 case OPAL_SUCCESS: return 0;
1001
1002 case OPAL_PARAMETER: return -EINVAL;
1003 case OPAL_ASYNC_COMPLETION: return -EINPROGRESS;
1004 case OPAL_BUSY_EVENT: return -EBUSY;
1005 case OPAL_NO_MEM: return -ENOMEM;
1006 case OPAL_PERMISSION: return -EPERM;
1007
1008 case OPAL_UNSUPPORTED: return -EIO;
1009 case OPAL_HARDWARE: return -EIO;
1010 case OPAL_INTERNAL_ERROR: return -EIO;
1011 case OPAL_TIMEOUT: return -ETIMEDOUT;
1012 default:
1013 pr_err("%s: unexpected OPAL error %d\n", __func__, rc);
1014 return -EIO;
1015 }
1016 }
1017
powernv_set_nmmu_ptcr(unsigned long ptcr)1018 void powernv_set_nmmu_ptcr(unsigned long ptcr)
1019 {
1020 int rc;
1021
1022 if (firmware_has_feature(FW_FEATURE_OPAL)) {
1023 rc = opal_nmmu_set_ptcr(-1UL, ptcr);
1024 if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED)
1025 pr_warn("%s: Unable to set nest mmu ptcr\n", __func__);
1026 }
1027 }
1028
1029 EXPORT_SYMBOL_GPL(opal_poll_events);
1030 EXPORT_SYMBOL_GPL(opal_rtc_read);
1031 EXPORT_SYMBOL_GPL(opal_rtc_write);
1032 EXPORT_SYMBOL_GPL(opal_tpo_read);
1033 EXPORT_SYMBOL_GPL(opal_tpo_write);
1034 EXPORT_SYMBOL_GPL(opal_i2c_request);
1035 /* Export these symbols for PowerNV LED class driver */
1036 EXPORT_SYMBOL_GPL(opal_leds_get_ind);
1037 EXPORT_SYMBOL_GPL(opal_leds_set_ind);
1038 /* Export this symbol for PowerNV Operator Panel class driver */
1039 EXPORT_SYMBOL_GPL(opal_write_oppanel_async);
1040 /* Export this for KVM */
1041 EXPORT_SYMBOL_GPL(opal_int_set_mfrr);
1042 EXPORT_SYMBOL_GPL(opal_int_eoi);
1043