]>
Commit | Line | Data |
---|---|---|
14a43e69 BH |
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> | |
26a2056e | 16 | #include <linux/of_fdt.h> |
14a43e69 | 17 | #include <linux/of_platform.h> |
a125e092 | 18 | #include <linux/interrupt.h> |
1bc98de2 | 19 | #include <linux/notifier.h> |
73ed148a | 20 | #include <linux/slab.h> |
b63a0ffe | 21 | #include <linux/sched.h> |
6f68b5e2 | 22 | #include <linux/kobject.h> |
f7d98d18 | 23 | #include <linux/delay.h> |
55672ecf | 24 | #include <linux/memblock.h> |
b14726c5 ME |
25 | |
26 | #include <asm/machdep.h> | |
14a43e69 BH |
27 | #include <asm/opal.h> |
28 | #include <asm/firmware.h> | |
36df96f8 | 29 | #include <asm/mce.h> |
14a43e69 BH |
30 | |
31 | #include "powernv.h" | |
32 | ||
6f68b5e2 VH |
33 | /* /sys/firmware/opal */ |
34 | struct kobject *opal_kobj; | |
35 | ||
14a43e69 BH |
36 | struct opal { |
37 | u64 base; | |
38 | u64 entry; | |
55672ecf | 39 | u64 size; |
14a43e69 BH |
40 | } opal; |
41 | ||
55672ecf MS |
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 | ||
bfc36894 | 51 | struct device_node *opal_node; |
14a43e69 | 52 | static DEFINE_SPINLOCK(opal_write_lock); |
73ed148a BH |
53 | static unsigned int *opal_irqs; |
54 | static unsigned int opal_irq_count; | |
1bc98de2 | 55 | static ATOMIC_NOTIFIER_HEAD(opal_notifier_head); |
24366360 | 56 | static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; |
1bc98de2 GS |
57 | static DEFINE_SPINLOCK(opal_notifier_lock); |
58 | static uint64_t last_notified_mask = 0x0ul; | |
59 | static atomic_t opal_notifier_hold = ATOMIC_INIT(0); | |
14a43e69 | 60 | |
4926616c BH |
61 | static void opal_reinit_cores(void) |
62 | { | |
63 | /* Do the actual re-init, This will clobber all FPRs, VRs, etc... | |
64 | * | |
65 | * It will preserve non volatile GPRs and HSPRG0/1. It will | |
66 | * also restore HIDs and other SPRs to their original value | |
67 | * but it might clobber a bunch. | |
68 | */ | |
69 | #ifdef __BIG_ENDIAN__ | |
70 | opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); | |
71 | #else | |
72 | opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); | |
73 | #endif | |
74 | } | |
75 | ||
14a43e69 BH |
76 | int __init early_init_dt_scan_opal(unsigned long node, |
77 | const char *uname, int depth, void *data) | |
78 | { | |
55672ecf | 79 | const void *basep, *entryp, *sizep; |
9d0c4dfe | 80 | int basesz, entrysz, runtimesz; |
14a43e69 BH |
81 | |
82 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
83 | return 0; | |
84 | ||
85 | basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); | |
86 | entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); | |
55672ecf | 87 | sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); |
14a43e69 | 88 | |
55672ecf | 89 | if (!basep || !entryp || !sizep) |
14a43e69 BH |
90 | return 1; |
91 | ||
92 | opal.base = of_read_number(basep, basesz/4); | |
93 | opal.entry = of_read_number(entryp, entrysz/4); | |
55672ecf | 94 | opal.size = of_read_number(sizep, runtimesz/4); |
14a43e69 | 95 | |
9d0c4dfe | 96 | pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", |
14a43e69 | 97 | opal.base, basep, basesz); |
9d0c4dfe | 98 | pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", |
14a43e69 | 99 | opal.entry, entryp, entrysz); |
9d0c4dfe | 100 | pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", |
55672ecf | 101 | opal.size, sizep, runtimesz); |
14a43e69 BH |
102 | |
103 | powerpc_firmware_features |= FW_FEATURE_OPAL; | |
75b93da4 BH |
104 | if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { |
105 | powerpc_firmware_features |= FW_FEATURE_OPALv2; | |
106 | powerpc_firmware_features |= FW_FEATURE_OPALv3; | |
9a4f5cd0 | 107 | pr_info("OPAL V3 detected !\n"); |
75b93da4 | 108 | } else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) { |
14a43e69 | 109 | powerpc_firmware_features |= FW_FEATURE_OPALv2; |
9a4f5cd0 | 110 | pr_info("OPAL V2 detected !\n"); |
14a43e69 | 111 | } else { |
9a4f5cd0 | 112 | pr_info("OPAL V1 detected !\n"); |
14a43e69 BH |
113 | } |
114 | ||
4926616c BH |
115 | /* Reinit all cores with the right endian */ |
116 | opal_reinit_cores(); | |
117 | ||
118 | /* Restore some bits */ | |
119 | if (cur_cpu_spec->cpu_restore) | |
120 | cur_cpu_spec->cpu_restore(); | |
121 | ||
c4463b37 JK |
122 | return 1; |
123 | } | |
124 | ||
55672ecf MS |
125 | int __init early_init_dt_scan_recoverable_ranges(unsigned long node, |
126 | const char *uname, int depth, void *data) | |
127 | { | |
9d0c4dfe | 128 | int i, psize, size; |
55672ecf MS |
129 | const __be32 *prop; |
130 | ||
131 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
132 | return 0; | |
133 | ||
6e556b47 | 134 | prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); |
55672ecf MS |
135 | |
136 | if (!prop) | |
137 | return 1; | |
138 | ||
139 | pr_debug("Found machine check recoverable ranges.\n"); | |
140 | ||
6e556b47 MS |
141 | /* |
142 | * Calculate number of available entries. | |
143 | * | |
144 | * Each recoverable address range entry is (start address, len, | |
145 | * recovery address), 2 cells each for start and recovery address, | |
146 | * 1 cell for len, totalling 5 cells per entry. | |
147 | */ | |
148 | mc_recoverable_range_len = psize / (sizeof(*prop) * 5); | |
149 | ||
150 | /* Sanity check */ | |
151 | if (!mc_recoverable_range_len) | |
152 | return 1; | |
153 | ||
154 | /* Size required to hold all the entries. */ | |
155 | size = mc_recoverable_range_len * | |
156 | sizeof(struct mcheck_recoverable_range); | |
157 | ||
55672ecf MS |
158 | /* |
159 | * Allocate a buffer to hold the MC recoverable ranges. We would be | |
160 | * accessing them in real mode, hence it needs to be within | |
161 | * RMO region. | |
162 | */ | |
163 | mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), | |
164 | ppc64_rma_size)); | |
165 | memset(mc_recoverable_range, 0, size); | |
166 | ||
6e556b47 | 167 | for (i = 0; i < mc_recoverable_range_len; i++) { |
55672ecf MS |
168 | mc_recoverable_range[i].start_addr = |
169 | of_read_number(prop + (i * 5) + 0, 2); | |
170 | mc_recoverable_range[i].end_addr = | |
171 | mc_recoverable_range[i].start_addr + | |
172 | of_read_number(prop + (i * 5) + 2, 1); | |
173 | mc_recoverable_range[i].recover_addr = | |
174 | of_read_number(prop + (i * 5) + 3, 2); | |
175 | ||
176 | pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", | |
177 | mc_recoverable_range[i].start_addr, | |
178 | mc_recoverable_range[i].end_addr, | |
179 | mc_recoverable_range[i].recover_addr); | |
180 | } | |
55672ecf MS |
181 | return 1; |
182 | } | |
183 | ||
c4463b37 JK |
184 | static int __init opal_register_exception_handlers(void) |
185 | { | |
29186097 | 186 | #ifdef __BIG_ENDIAN__ |
c4463b37 JK |
187 | u64 glue; |
188 | ||
189 | if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) | |
190 | return -ENODEV; | |
191 | ||
28446de2 MS |
192 | /* Hookup some exception handlers except machine check. We use the |
193 | * fwnmi area at 0x7000 to provide the glue space to OPAL | |
ed79ba9e BH |
194 | */ |
195 | glue = 0x7000; | |
6507955c MS |
196 | |
197 | /* | |
198 | * Check if we are running on newer firmware that exports | |
199 | * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch | |
200 | * the HMI interrupt and we catch it directly in Linux. | |
201 | * | |
202 | * For older firmware (i.e currently released POWER8 System Firmware | |
203 | * as of today <= SV810_087), we fallback to old behavior and let OPAL | |
204 | * patch the HMI vector and handle it inside OPAL firmware. | |
205 | * | |
206 | * For newer firmware (in development/yet to be released) we will | |
207 | * start catching/handling HMI directly in Linux. | |
208 | */ | |
209 | if (!opal_check_token(OPAL_HANDLE_HMI)) { | |
210 | pr_info("opal: Old firmware detected, OPAL handles HMIs.\n"); | |
211 | opal_register_exception_handler( | |
212 | OPAL_HYPERVISOR_MAINTENANCE_HANDLER, | |
213 | 0, glue); | |
214 | glue += 128; | |
215 | } | |
216 | ||
ed79ba9e | 217 | opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); |
29186097 | 218 | #endif |
ed79ba9e | 219 | |
c4463b37 | 220 | return 0; |
14a43e69 | 221 | } |
b14726c5 | 222 | machine_early_initcall(powernv, opal_register_exception_handlers); |
c4463b37 | 223 | |
1bc98de2 GS |
224 | int opal_notifier_register(struct notifier_block *nb) |
225 | { | |
226 | if (!nb) { | |
227 | pr_warning("%s: Invalid argument (%p)\n", | |
228 | __func__, nb); | |
229 | return -EINVAL; | |
230 | } | |
231 | ||
232 | atomic_notifier_chain_register(&opal_notifier_head, nb); | |
233 | return 0; | |
234 | } | |
798af00c BH |
235 | EXPORT_SYMBOL_GPL(opal_notifier_register); |
236 | ||
237 | int opal_notifier_unregister(struct notifier_block *nb) | |
238 | { | |
239 | if (!nb) { | |
240 | pr_warning("%s: Invalid argument (%p)\n", | |
241 | __func__, nb); | |
242 | return -EINVAL; | |
243 | } | |
244 | ||
245 | atomic_notifier_chain_unregister(&opal_notifier_head, nb); | |
246 | return 0; | |
247 | } | |
248 | EXPORT_SYMBOL_GPL(opal_notifier_unregister); | |
1bc98de2 GS |
249 | |
250 | static void opal_do_notifier(uint64_t events) | |
251 | { | |
252 | unsigned long flags; | |
253 | uint64_t changed_mask; | |
254 | ||
255 | if (atomic_read(&opal_notifier_hold)) | |
256 | return; | |
257 | ||
258 | spin_lock_irqsave(&opal_notifier_lock, flags); | |
259 | changed_mask = last_notified_mask ^ events; | |
260 | last_notified_mask = events; | |
261 | spin_unlock_irqrestore(&opal_notifier_lock, flags); | |
262 | ||
263 | /* | |
264 | * We feed with the event bits and changed bits for | |
265 | * enough information to the callback. | |
266 | */ | |
267 | atomic_notifier_call_chain(&opal_notifier_head, | |
268 | events, (void *)changed_mask); | |
269 | } | |
270 | ||
271 | void opal_notifier_update_evt(uint64_t evt_mask, | |
272 | uint64_t evt_val) | |
273 | { | |
274 | unsigned long flags; | |
275 | ||
276 | spin_lock_irqsave(&opal_notifier_lock, flags); | |
277 | last_notified_mask &= ~evt_mask; | |
278 | last_notified_mask |= evt_val; | |
279 | spin_unlock_irqrestore(&opal_notifier_lock, flags); | |
280 | } | |
281 | ||
282 | void opal_notifier_enable(void) | |
283 | { | |
284 | int64_t rc; | |
56b4c993 | 285 | __be64 evt = 0; |
1bc98de2 GS |
286 | |
287 | atomic_set(&opal_notifier_hold, 0); | |
288 | ||
289 | /* Process pending events */ | |
290 | rc = opal_poll_events(&evt); | |
291 | if (rc == OPAL_SUCCESS && evt) | |
56b4c993 | 292 | opal_do_notifier(be64_to_cpu(evt)); |
1bc98de2 GS |
293 | } |
294 | ||
295 | void opal_notifier_disable(void) | |
296 | { | |
297 | atomic_set(&opal_notifier_hold, 1); | |
298 | } | |
299 | ||
24366360 MS |
300 | /* |
301 | * Opal message notifier based on message type. Allow subscribers to get | |
302 | * notified for specific messgae type. | |
303 | */ | |
304 | int opal_message_notifier_register(enum OpalMessageType msg_type, | |
305 | struct notifier_block *nb) | |
306 | { | |
307 | if (!nb) { | |
308 | pr_warning("%s: Invalid argument (%p)\n", | |
309 | __func__, nb); | |
310 | return -EINVAL; | |
311 | } | |
312 | if (msg_type > OPAL_MSG_TYPE_MAX) { | |
313 | pr_warning("%s: Invalid message type argument (%d)\n", | |
314 | __func__, msg_type); | |
315 | return -EINVAL; | |
316 | } | |
317 | return atomic_notifier_chain_register( | |
318 | &opal_msg_notifier_head[msg_type], nb); | |
319 | } | |
320 | ||
321 | static void opal_message_do_notify(uint32_t msg_type, void *msg) | |
322 | { | |
323 | /* notify subscribers */ | |
324 | atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], | |
325 | msg_type, msg); | |
326 | } | |
327 | ||
328 | static void opal_handle_message(void) | |
329 | { | |
330 | s64 ret; | |
331 | /* | |
332 | * TODO: pre-allocate a message buffer depending on opal-msg-size | |
333 | * value in /proc/device-tree. | |
334 | */ | |
335 | static struct opal_msg msg; | |
bb4398e1 | 336 | u32 type; |
24366360 MS |
337 | |
338 | ret = opal_get_msg(__pa(&msg), sizeof(msg)); | |
339 | /* No opal message pending. */ | |
340 | if (ret == OPAL_RESOURCE) | |
341 | return; | |
342 | ||
343 | /* check for errors. */ | |
344 | if (ret) { | |
1a84db56 | 345 | pr_warning("%s: Failed to retrieve opal message, err=%lld\n", |
24366360 MS |
346 | __func__, ret); |
347 | return; | |
348 | } | |
349 | ||
bb4398e1 AB |
350 | type = be32_to_cpu(msg.msg_type); |
351 | ||
24366360 | 352 | /* Sanity check */ |
bb4398e1 AB |
353 | if (type > OPAL_MSG_TYPE_MAX) { |
354 | pr_warning("%s: Unknown message type: %u\n", __func__, type); | |
24366360 MS |
355 | return; |
356 | } | |
bb4398e1 | 357 | opal_message_do_notify(type, (void *)&msg); |
24366360 MS |
358 | } |
359 | ||
360 | static int opal_message_notify(struct notifier_block *nb, | |
361 | unsigned long events, void *change) | |
362 | { | |
363 | if (events & OPAL_EVENT_MSG_PENDING) | |
364 | opal_handle_message(); | |
365 | return 0; | |
366 | } | |
367 | ||
368 | static struct notifier_block opal_message_nb = { | |
369 | .notifier_call = opal_message_notify, | |
370 | .next = NULL, | |
371 | .priority = 0, | |
372 | }; | |
373 | ||
374 | static int __init opal_message_init(void) | |
375 | { | |
376 | int ret, i; | |
377 | ||
378 | for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) | |
379 | ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); | |
380 | ||
381 | ret = opal_notifier_register(&opal_message_nb); | |
382 | if (ret) { | |
383 | pr_err("%s: Can't register OPAL event notifier (%d)\n", | |
384 | __func__, ret); | |
385 | return ret; | |
386 | } | |
387 | return 0; | |
388 | } | |
b14726c5 | 389 | machine_early_initcall(powernv, opal_message_init); |
24366360 | 390 | |
14a43e69 BH |
391 | int opal_get_chars(uint32_t vtermno, char *buf, int count) |
392 | { | |
4f89363b BH |
393 | s64 rc; |
394 | __be64 evt, len; | |
14a43e69 BH |
395 | |
396 | if (!opal.entry) | |
daea1175 | 397 | return -ENODEV; |
14a43e69 | 398 | opal_poll_events(&evt); |
4f89363b | 399 | if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) |
14a43e69 | 400 | return 0; |
4f89363b | 401 | len = cpu_to_be64(count); |
9d0c4dfe | 402 | rc = opal_console_read(vtermno, &len, buf); |
14a43e69 | 403 | if (rc == OPAL_SUCCESS) |
4f89363b | 404 | return be64_to_cpu(len); |
14a43e69 BH |
405 | return 0; |
406 | } | |
407 | ||
408 | int opal_put_chars(uint32_t vtermno, const char *data, int total_len) | |
409 | { | |
410 | int written = 0; | |
4f89363b | 411 | __be64 olen; |
daea1175 | 412 | s64 len, rc; |
14a43e69 | 413 | unsigned long flags; |
4f89363b | 414 | __be64 evt; |
14a43e69 BH |
415 | |
416 | if (!opal.entry) | |
daea1175 | 417 | return -ENODEV; |
14a43e69 BH |
418 | |
419 | /* We want put_chars to be atomic to avoid mangling of hvsi | |
420 | * packets. To do that, we first test for room and return | |
daea1175 BH |
421 | * -EAGAIN if there isn't enough. |
422 | * | |
423 | * Unfortunately, opal_console_write_buffer_space() doesn't | |
424 | * appear to work on opal v1, so we just assume there is | |
425 | * enough room and be done with it | |
14a43e69 BH |
426 | */ |
427 | spin_lock_irqsave(&opal_write_lock, flags); | |
daea1175 | 428 | if (firmware_has_feature(FW_FEATURE_OPALv2)) { |
4f89363b BH |
429 | rc = opal_console_write_buffer_space(vtermno, &olen); |
430 | len = be64_to_cpu(olen); | |
daea1175 BH |
431 | if (rc || len < total_len) { |
432 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
433 | /* Closed -> drop characters */ | |
434 | if (rc) | |
435 | return total_len; | |
4f89363b | 436 | opal_poll_events(NULL); |
daea1175 BH |
437 | return -EAGAIN; |
438 | } | |
14a43e69 BH |
439 | } |
440 | ||
441 | /* We still try to handle partial completions, though they | |
442 | * should no longer happen. | |
443 | */ | |
daea1175 | 444 | rc = OPAL_BUSY; |
14a43e69 BH |
445 | while(total_len > 0 && (rc == OPAL_BUSY || |
446 | rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { | |
4f89363b BH |
447 | olen = cpu_to_be64(total_len); |
448 | rc = opal_console_write(vtermno, &olen, data); | |
449 | len = be64_to_cpu(olen); | |
1de1455f BH |
450 | |
451 | /* Closed or other error drop */ | |
452 | if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && | |
453 | rc != OPAL_BUSY_EVENT) { | |
454 | written = total_len; | |
455 | break; | |
456 | } | |
14a43e69 BH |
457 | if (rc == OPAL_SUCCESS) { |
458 | total_len -= len; | |
459 | data += len; | |
460 | written += len; | |
461 | } | |
462 | /* This is a bit nasty but we need that for the console to | |
463 | * flush when there aren't any interrupts. We will clean | |
464 | * things a bit later to limit that to synchronous path | |
465 | * such as the kernel console and xmon/udbg | |
466 | */ | |
467 | do | |
468 | opal_poll_events(&evt); | |
4f89363b BH |
469 | while(rc == OPAL_SUCCESS && |
470 | (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); | |
14a43e69 BH |
471 | } |
472 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
473 | return written; | |
474 | } | |
475 | ||
b63a0ffe MS |
476 | static int opal_recover_mce(struct pt_regs *regs, |
477 | struct machine_check_event *evt) | |
478 | { | |
479 | int recovered = 0; | |
480 | uint64_t ea = get_mce_fault_addr(evt); | |
481 | ||
482 | if (!(regs->msr & MSR_RI)) { | |
483 | /* If MSR_RI isn't set, we cannot recover */ | |
484 | recovered = 0; | |
485 | } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { | |
486 | /* Platform corrected itself */ | |
487 | recovered = 1; | |
488 | } else if (ea && !is_kernel_addr(ea)) { | |
489 | /* | |
490 | * Faulting address is not in kernel text. We should be fine. | |
491 | * We need to find which process uses this address. | |
492 | * For now, kill the task if we have received exception when | |
493 | * in userspace. | |
494 | * | |
495 | * TODO: Queue up this address for hwpoisioning later. | |
496 | */ | |
497 | if (user_mode(regs) && !is_global_init(current)) { | |
498 | _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); | |
499 | recovered = 1; | |
500 | } else | |
501 | recovered = 0; | |
502 | } else if (user_mode(regs) && !is_global_init(current) && | |
503 | evt->severity == MCE_SEV_ERROR_SYNC) { | |
504 | /* | |
505 | * If we have received a synchronous error when in userspace | |
506 | * kill the task. | |
507 | */ | |
508 | _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); | |
509 | recovered = 1; | |
510 | } | |
511 | return recovered; | |
512 | } | |
513 | ||
ed79ba9e BH |
514 | int opal_machine_check(struct pt_regs *regs) |
515 | { | |
36df96f8 | 516 | struct machine_check_event evt; |
ed79ba9e | 517 | |
36df96f8 MS |
518 | if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) |
519 | return 0; | |
ed79ba9e BH |
520 | |
521 | /* Print things out */ | |
36df96f8 | 522 | if (evt.version != MCE_V1) { |
ed79ba9e BH |
523 | pr_err("Machine Check Exception, Unknown event version %d !\n", |
524 | evt.version); | |
525 | return 0; | |
526 | } | |
b5ff4211 | 527 | machine_check_print_event_info(&evt); |
ed79ba9e | 528 | |
b63a0ffe MS |
529 | if (opal_recover_mce(regs, &evt)) |
530 | return 1; | |
531 | return 0; | |
ed79ba9e BH |
532 | } |
533 | ||
0869b6fd MS |
534 | /* Early hmi handler called in real mode. */ |
535 | int opal_hmi_exception_early(struct pt_regs *regs) | |
536 | { | |
0ef95b41 MS |
537 | s64 rc; |
538 | ||
539 | /* | |
540 | * call opal hmi handler. Pass paca address as token. | |
541 | * The return value OPAL_SUCCESS is an indication that there is | |
542 | * an HMI event generated waiting to pull by Linux. | |
543 | */ | |
544 | rc = opal_handle_hmi(); | |
545 | if (rc == OPAL_SUCCESS) { | |
546 | local_paca->hmi_event_available = 1; | |
547 | return 1; | |
548 | } | |
0869b6fd MS |
549 | return 0; |
550 | } | |
551 | ||
552 | /* HMI exception handler called in virtual mode during check_irq_replay. */ | |
553 | int opal_handle_hmi_exception(struct pt_regs *regs) | |
554 | { | |
0ef95b41 MS |
555 | s64 rc; |
556 | __be64 evt = 0; | |
557 | ||
558 | /* | |
559 | * Check if HMI event is available. | |
560 | * if Yes, then call opal_poll_events to pull opal messages and | |
561 | * process them. | |
562 | */ | |
563 | if (!local_paca->hmi_event_available) | |
564 | return 0; | |
565 | ||
566 | local_paca->hmi_event_available = 0; | |
567 | rc = opal_poll_events(&evt); | |
568 | if (rc == OPAL_SUCCESS && evt) | |
569 | opal_do_notifier(be64_to_cpu(evt)); | |
570 | ||
571 | return 1; | |
0869b6fd MS |
572 | } |
573 | ||
55672ecf MS |
574 | static uint64_t find_recovery_address(uint64_t nip) |
575 | { | |
576 | int i; | |
577 | ||
578 | for (i = 0; i < mc_recoverable_range_len; i++) | |
579 | if ((nip >= mc_recoverable_range[i].start_addr) && | |
580 | (nip < mc_recoverable_range[i].end_addr)) | |
581 | return mc_recoverable_range[i].recover_addr; | |
582 | return 0; | |
583 | } | |
584 | ||
585 | bool opal_mce_check_early_recovery(struct pt_regs *regs) | |
586 | { | |
587 | uint64_t recover_addr = 0; | |
588 | ||
589 | if (!opal.base || !opal.size) | |
590 | goto out; | |
591 | ||
592 | if ((regs->nip >= opal.base) && | |
593 | (regs->nip <= (opal.base + opal.size))) | |
594 | recover_addr = find_recovery_address(regs->nip); | |
595 | ||
596 | /* | |
597 | * Setup regs->nip to rfi into fixup address. | |
598 | */ | |
599 | if (recover_addr) | |
600 | regs->nip = recover_addr; | |
601 | ||
602 | out: | |
603 | return !!recover_addr; | |
604 | } | |
605 | ||
a125e092 BH |
606 | static irqreturn_t opal_interrupt(int irq, void *data) |
607 | { | |
5e4da530 | 608 | __be64 events; |
a125e092 BH |
609 | |
610 | opal_handle_interrupt(virq_to_hw(irq), &events); | |
611 | ||
56b4c993 | 612 | opal_do_notifier(be64_to_cpu(events)); |
a125e092 BH |
613 | |
614 | return IRQ_HANDLED; | |
615 | } | |
616 | ||
6f68b5e2 VH |
617 | static int opal_sysfs_init(void) |
618 | { | |
619 | opal_kobj = kobject_create_and_add("opal", firmware_kobj); | |
620 | if (!opal_kobj) { | |
621 | pr_warn("kobject_create_and_add opal failed\n"); | |
622 | return -ENOMEM; | |
623 | } | |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
b09c2ec4 VH |
628 | static void __init opal_dump_region_init(void) |
629 | { | |
630 | void *addr; | |
631 | uint64_t size; | |
632 | int rc; | |
633 | ||
634 | /* Register kernel log buffer */ | |
635 | addr = log_buf_addr_get(); | |
636 | size = log_buf_len_get(); | |
637 | rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, | |
638 | __pa(addr), size); | |
639 | /* Don't warn if this is just an older OPAL that doesn't | |
640 | * know about that call | |
641 | */ | |
642 | if (rc && rc != OPAL_UNSUPPORTED) | |
643 | pr_warn("DUMP: Failed to register kernel log buffer. " | |
644 | "rc = %d\n", rc); | |
645 | } | |
608b286d JK |
646 | |
647 | static void opal_ipmi_init(struct device_node *opal_node) | |
648 | { | |
649 | struct device_node *np; | |
650 | ||
651 | for_each_child_of_node(opal_node, np) | |
652 | if (of_device_is_compatible(np, "ibm,opal-ipmi")) | |
653 | of_platform_device_create(np, NULL, NULL); | |
654 | } | |
655 | ||
47083450 NG |
656 | static void opal_i2c_create_devs(void) |
657 | { | |
658 | struct device_node *np; | |
659 | ||
660 | for_each_compatible_node(np, NULL, "ibm,opal-i2c") | |
661 | of_platform_device_create(np, NULL, NULL); | |
662 | } | |
663 | ||
14a43e69 BH |
664 | static int __init opal_init(void) |
665 | { | |
666 | struct device_node *np, *consoles; | |
1cc79bc8 | 667 | const __be32 *irqs; |
a125e092 | 668 | int rc, i, irqlen; |
14a43e69 BH |
669 | |
670 | opal_node = of_find_node_by_path("/ibm,opal"); | |
671 | if (!opal_node) { | |
672 | pr_warn("opal: Node not found\n"); | |
673 | return -ENODEV; | |
674 | } | |
2db29d28 BH |
675 | |
676 | /* Register OPAL consoles if any ports */ | |
14a43e69 BH |
677 | if (firmware_has_feature(FW_FEATURE_OPALv2)) |
678 | consoles = of_find_node_by_path("/ibm,opal/consoles"); | |
679 | else | |
680 | consoles = of_node_get(opal_node); | |
2db29d28 BH |
681 | if (consoles) { |
682 | for_each_child_of_node(consoles, np) { | |
683 | if (strcmp(np->name, "serial")) | |
684 | continue; | |
685 | of_platform_device_create(np, NULL, NULL); | |
686 | } | |
687 | of_node_put(consoles); | |
14a43e69 | 688 | } |
a125e092 | 689 | |
47083450 NG |
690 | /* Create i2c platform devices */ |
691 | opal_i2c_create_devs(); | |
692 | ||
a125e092 BH |
693 | /* Find all OPAL interrupts and request them */ |
694 | irqs = of_get_property(opal_node, "opal-interrupts", &irqlen); | |
695 | pr_debug("opal: Found %d interrupts reserved for OPAL\n", | |
696 | irqs ? (irqlen / 4) : 0); | |
73ed148a BH |
697 | opal_irq_count = irqlen / 4; |
698 | opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL); | |
a125e092 BH |
699 | for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) { |
700 | unsigned int hwirq = be32_to_cpup(irqs); | |
701 | unsigned int irq = irq_create_mapping(NULL, hwirq); | |
702 | if (irq == NO_IRQ) { | |
703 | pr_warning("opal: Failed to map irq 0x%x\n", hwirq); | |
704 | continue; | |
705 | } | |
706 | rc = request_irq(irq, opal_interrupt, 0, "opal", NULL); | |
707 | if (rc) | |
708 | pr_warning("opal: Error %d requesting irq %d" | |
709 | " (0x%x)\n", rc, irq, hwirq); | |
73ed148a | 710 | opal_irqs[i] = irq; |
a125e092 | 711 | } |
6f68b5e2 VH |
712 | |
713 | /* Create "opal" kobject under /sys/firmware */ | |
714 | rc = opal_sysfs_init(); | |
50bd6153 | 715 | if (rc == 0) { |
b09c2ec4 VH |
716 | /* Setup dump region interface */ |
717 | opal_dump_region_init(); | |
774fea1a SS |
718 | /* Setup error log interface */ |
719 | rc = opal_elog_init(); | |
50bd6153 VH |
720 | /* Setup code update interface */ |
721 | opal_flash_init(); | |
c7e64b9c SS |
722 | /* Setup platform dump extract interface */ |
723 | opal_platform_dump_init(); | |
4029cd66 NG |
724 | /* Setup system parameters interface */ |
725 | opal_sys_param_init(); | |
bfc36894 JS |
726 | /* Setup message log interface. */ |
727 | opal_msglog_init(); | |
50bd6153 | 728 | } |
6f68b5e2 | 729 | |
608b286d JK |
730 | opal_ipmi_init(opal_node); |
731 | ||
14a43e69 BH |
732 | return 0; |
733 | } | |
b14726c5 | 734 | machine_subsys_initcall(powernv, opal_init); |
73ed148a BH |
735 | |
736 | void opal_shutdown(void) | |
737 | { | |
738 | unsigned int i; | |
f7d98d18 | 739 | long rc = OPAL_BUSY; |
73ed148a | 740 | |
f7d98d18 | 741 | /* First free interrupts, which will also mask them */ |
73ed148a BH |
742 | for (i = 0; i < opal_irq_count; i++) { |
743 | if (opal_irqs[i]) | |
b0d436c7 | 744 | free_irq(opal_irqs[i], NULL); |
73ed148a BH |
745 | opal_irqs[i] = 0; |
746 | } | |
f7d98d18 VH |
747 | |
748 | /* | |
749 | * Then sync with OPAL which ensure anything that can | |
750 | * potentially write to our memory has completed such | |
751 | * as an ongoing dump retrieval | |
752 | */ | |
753 | while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
754 | rc = opal_sync_host_reboot(); | |
755 | if (rc == OPAL_BUSY) | |
756 | opal_poll_events(NULL); | |
757 | else | |
758 | mdelay(10); | |
759 | } | |
b09c2ec4 VH |
760 | |
761 | /* Unregister memory dump region */ | |
762 | opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); | |
73ed148a | 763 | } |
e28b05e7 JS |
764 | |
765 | /* Export this so that test modules can use it */ | |
766 | EXPORT_SYMBOL_GPL(opal_invalid_call); | |
608b286d JK |
767 | EXPORT_SYMBOL_GPL(opal_ipmi_send); |
768 | EXPORT_SYMBOL_GPL(opal_ipmi_recv); | |
3441f04b AB |
769 | |
770 | /* Convert a region of vmalloc memory to an opal sg list */ | |
771 | struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, | |
772 | unsigned long vmalloc_size) | |
773 | { | |
774 | struct opal_sg_list *sg, *first = NULL; | |
775 | unsigned long i = 0; | |
776 | ||
777 | sg = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
778 | if (!sg) | |
779 | goto nomem; | |
780 | ||
781 | first = sg; | |
782 | ||
783 | while (vmalloc_size > 0) { | |
784 | uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; | |
785 | uint64_t length = min(vmalloc_size, PAGE_SIZE); | |
786 | ||
787 | sg->entry[i].data = cpu_to_be64(data); | |
788 | sg->entry[i].length = cpu_to_be64(length); | |
789 | i++; | |
790 | ||
791 | if (i >= SG_ENTRIES_PER_NODE) { | |
792 | struct opal_sg_list *next; | |
793 | ||
794 | next = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
795 | if (!next) | |
796 | goto nomem; | |
797 | ||
798 | sg->length = cpu_to_be64( | |
799 | i * sizeof(struct opal_sg_entry) + 16); | |
800 | i = 0; | |
801 | sg->next = cpu_to_be64(__pa(next)); | |
802 | sg = next; | |
803 | } | |
804 | ||
805 | vmalloc_addr += length; | |
806 | vmalloc_size -= length; | |
807 | } | |
808 | ||
809 | sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); | |
810 | ||
811 | return first; | |
812 | ||
813 | nomem: | |
814 | pr_err("%s : Failed to allocate memory\n", __func__); | |
815 | opal_free_sg_list(first); | |
816 | return NULL; | |
817 | } | |
818 | ||
819 | void opal_free_sg_list(struct opal_sg_list *sg) | |
820 | { | |
821 | while (sg) { | |
822 | uint64_t next = be64_to_cpu(sg->next); | |
823 | ||
824 | kfree(sg); | |
825 | ||
826 | if (next) | |
827 | sg = __va(next); | |
828 | else | |
829 | sg = NULL; | |
830 | } | |
831 | } | |
16b1d26e NG |
832 | |
833 | EXPORT_SYMBOL_GPL(opal_poll_events); | |
834 | EXPORT_SYMBOL_GPL(opal_rtc_read); | |
835 | EXPORT_SYMBOL_GPL(opal_rtc_write); | |
836 | EXPORT_SYMBOL_GPL(opal_tpo_read); | |
837 | EXPORT_SYMBOL_GPL(opal_tpo_write); | |
47083450 | 838 | EXPORT_SYMBOL_GPL(opal_i2c_request); |