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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 | ||
c8742f85 | 12 | #define pr_fmt(fmt) "opal: " fmt |
14a43e69 | 13 | |
c8742f85 | 14 | #include <linux/printk.h> |
14a43e69 BH |
15 | #include <linux/types.h> |
16 | #include <linux/of.h> | |
26a2056e | 17 | #include <linux/of_fdt.h> |
14a43e69 | 18 | #include <linux/of_platform.h> |
a125e092 | 19 | #include <linux/interrupt.h> |
1bc98de2 | 20 | #include <linux/notifier.h> |
73ed148a | 21 | #include <linux/slab.h> |
b63a0ffe | 22 | #include <linux/sched.h> |
6f68b5e2 | 23 | #include <linux/kobject.h> |
f7d98d18 | 24 | #include <linux/delay.h> |
55672ecf | 25 | #include <linux/memblock.h> |
3bf57561 BH |
26 | #include <linux/kthread.h> |
27 | #include <linux/freezer.h> | |
b14726c5 ME |
28 | |
29 | #include <asm/machdep.h> | |
14a43e69 BH |
30 | #include <asm/opal.h> |
31 | #include <asm/firmware.h> | |
36df96f8 | 32 | #include <asm/mce.h> |
14a43e69 BH |
33 | |
34 | #include "powernv.h" | |
35 | ||
6f68b5e2 VH |
36 | /* /sys/firmware/opal */ |
37 | struct kobject *opal_kobj; | |
38 | ||
14a43e69 BH |
39 | struct opal { |
40 | u64 base; | |
41 | u64 entry; | |
55672ecf | 42 | u64 size; |
14a43e69 BH |
43 | } opal; |
44 | ||
55672ecf MS |
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 | ||
bfc36894 | 54 | struct device_node *opal_node; |
14a43e69 | 55 | static DEFINE_SPINLOCK(opal_write_lock); |
1bc98de2 | 56 | static ATOMIC_NOTIFIER_HEAD(opal_notifier_head); |
24366360 | 57 | static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; |
1bc98de2 GS |
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); | |
3bf57561 | 61 | static uint32_t opal_heartbeat; |
14a43e69 | 62 | |
4926616c BH |
63 | static void opal_reinit_cores(void) |
64 | { | |
65 | /* Do the actual re-init, This will clobber all FPRs, VRs, etc... | |
66 | * | |
67 | * It will preserve non volatile GPRs and HSPRG0/1. It will | |
68 | * also restore HIDs and other SPRs to their original value | |
69 | * but it might clobber a bunch. | |
70 | */ | |
71 | #ifdef __BIG_ENDIAN__ | |
72 | opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); | |
73 | #else | |
74 | opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); | |
75 | #endif | |
76 | } | |
77 | ||
14a43e69 BH |
78 | int __init early_init_dt_scan_opal(unsigned long node, |
79 | const char *uname, int depth, void *data) | |
80 | { | |
55672ecf | 81 | const void *basep, *entryp, *sizep; |
9d0c4dfe | 82 | int basesz, entrysz, runtimesz; |
14a43e69 BH |
83 | |
84 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
85 | return 0; | |
86 | ||
87 | basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); | |
88 | entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); | |
55672ecf | 89 | sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); |
14a43e69 | 90 | |
55672ecf | 91 | if (!basep || !entryp || !sizep) |
14a43e69 BH |
92 | return 1; |
93 | ||
94 | opal.base = of_read_number(basep, basesz/4); | |
95 | opal.entry = of_read_number(entryp, entrysz/4); | |
55672ecf | 96 | opal.size = of_read_number(sizep, runtimesz/4); |
14a43e69 | 97 | |
9d0c4dfe | 98 | pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", |
14a43e69 | 99 | opal.base, basep, basesz); |
9d0c4dfe | 100 | pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", |
14a43e69 | 101 | opal.entry, entryp, entrysz); |
9d0c4dfe | 102 | pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", |
55672ecf | 103 | opal.size, sizep, runtimesz); |
14a43e69 BH |
104 | |
105 | powerpc_firmware_features |= FW_FEATURE_OPAL; | |
75b93da4 BH |
106 | if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { |
107 | powerpc_firmware_features |= FW_FEATURE_OPALv2; | |
108 | powerpc_firmware_features |= FW_FEATURE_OPALv3; | |
9a4f5cd0 | 109 | pr_info("OPAL V3 detected !\n"); |
75b93da4 | 110 | } else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) { |
14a43e69 | 111 | powerpc_firmware_features |= FW_FEATURE_OPALv2; |
9a4f5cd0 | 112 | pr_info("OPAL V2 detected !\n"); |
14a43e69 | 113 | } else { |
9a4f5cd0 | 114 | pr_info("OPAL V1 detected !\n"); |
14a43e69 BH |
115 | } |
116 | ||
4926616c BH |
117 | /* Reinit all cores with the right endian */ |
118 | opal_reinit_cores(); | |
119 | ||
120 | /* Restore some bits */ | |
121 | if (cur_cpu_spec->cpu_restore) | |
122 | cur_cpu_spec->cpu_restore(); | |
123 | ||
c4463b37 JK |
124 | return 1; |
125 | } | |
126 | ||
55672ecf MS |
127 | int __init early_init_dt_scan_recoverable_ranges(unsigned long node, |
128 | const char *uname, int depth, void *data) | |
129 | { | |
9d0c4dfe | 130 | int i, psize, size; |
55672ecf MS |
131 | const __be32 *prop; |
132 | ||
133 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
134 | return 0; | |
135 | ||
6e556b47 | 136 | prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); |
55672ecf MS |
137 | |
138 | if (!prop) | |
139 | return 1; | |
140 | ||
141 | pr_debug("Found machine check recoverable ranges.\n"); | |
142 | ||
6e556b47 MS |
143 | /* |
144 | * Calculate number of available entries. | |
145 | * | |
146 | * Each recoverable address range entry is (start address, len, | |
147 | * recovery address), 2 cells each for start and recovery address, | |
148 | * 1 cell for len, totalling 5 cells per entry. | |
149 | */ | |
150 | mc_recoverable_range_len = psize / (sizeof(*prop) * 5); | |
151 | ||
152 | /* Sanity check */ | |
153 | if (!mc_recoverable_range_len) | |
154 | return 1; | |
155 | ||
156 | /* Size required to hold all the entries. */ | |
157 | size = mc_recoverable_range_len * | |
158 | sizeof(struct mcheck_recoverable_range); | |
159 | ||
55672ecf MS |
160 | /* |
161 | * Allocate a buffer to hold the MC recoverable ranges. We would be | |
162 | * accessing them in real mode, hence it needs to be within | |
163 | * RMO region. | |
164 | */ | |
165 | mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), | |
166 | ppc64_rma_size)); | |
167 | memset(mc_recoverable_range, 0, size); | |
168 | ||
6e556b47 | 169 | for (i = 0; i < mc_recoverable_range_len; i++) { |
55672ecf MS |
170 | mc_recoverable_range[i].start_addr = |
171 | of_read_number(prop + (i * 5) + 0, 2); | |
172 | mc_recoverable_range[i].end_addr = | |
173 | mc_recoverable_range[i].start_addr + | |
174 | of_read_number(prop + (i * 5) + 2, 1); | |
175 | mc_recoverable_range[i].recover_addr = | |
176 | of_read_number(prop + (i * 5) + 3, 2); | |
177 | ||
178 | pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", | |
179 | mc_recoverable_range[i].start_addr, | |
180 | mc_recoverable_range[i].end_addr, | |
181 | mc_recoverable_range[i].recover_addr); | |
182 | } | |
55672ecf MS |
183 | return 1; |
184 | } | |
185 | ||
c4463b37 JK |
186 | static int __init opal_register_exception_handlers(void) |
187 | { | |
29186097 | 188 | #ifdef __BIG_ENDIAN__ |
c4463b37 JK |
189 | u64 glue; |
190 | ||
191 | if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) | |
192 | return -ENODEV; | |
193 | ||
28446de2 MS |
194 | /* Hookup some exception handlers except machine check. We use the |
195 | * fwnmi area at 0x7000 to provide the glue space to OPAL | |
ed79ba9e BH |
196 | */ |
197 | glue = 0x7000; | |
6507955c MS |
198 | |
199 | /* | |
200 | * Check if we are running on newer firmware that exports | |
201 | * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch | |
202 | * the HMI interrupt and we catch it directly in Linux. | |
203 | * | |
204 | * For older firmware (i.e currently released POWER8 System Firmware | |
205 | * as of today <= SV810_087), we fallback to old behavior and let OPAL | |
206 | * patch the HMI vector and handle it inside OPAL firmware. | |
207 | * | |
208 | * For newer firmware (in development/yet to be released) we will | |
209 | * start catching/handling HMI directly in Linux. | |
210 | */ | |
211 | if (!opal_check_token(OPAL_HANDLE_HMI)) { | |
08135139 | 212 | pr_info("Old firmware detected, OPAL handles HMIs.\n"); |
6507955c MS |
213 | opal_register_exception_handler( |
214 | OPAL_HYPERVISOR_MAINTENANCE_HANDLER, | |
215 | 0, glue); | |
216 | glue += 128; | |
217 | } | |
218 | ||
ed79ba9e | 219 | opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); |
29186097 | 220 | #endif |
ed79ba9e | 221 | |
c4463b37 | 222 | return 0; |
14a43e69 | 223 | } |
b14726c5 | 224 | machine_early_initcall(powernv, opal_register_exception_handlers); |
c4463b37 | 225 | |
1bc98de2 GS |
226 | int opal_notifier_register(struct notifier_block *nb) |
227 | { | |
228 | if (!nb) { | |
229 | pr_warning("%s: Invalid argument (%p)\n", | |
230 | __func__, nb); | |
231 | return -EINVAL; | |
232 | } | |
233 | ||
234 | atomic_notifier_chain_register(&opal_notifier_head, nb); | |
235 | return 0; | |
236 | } | |
798af00c BH |
237 | EXPORT_SYMBOL_GPL(opal_notifier_register); |
238 | ||
239 | int opal_notifier_unregister(struct notifier_block *nb) | |
240 | { | |
241 | if (!nb) { | |
242 | pr_warning("%s: Invalid argument (%p)\n", | |
243 | __func__, nb); | |
244 | return -EINVAL; | |
245 | } | |
246 | ||
247 | atomic_notifier_chain_unregister(&opal_notifier_head, nb); | |
248 | return 0; | |
249 | } | |
250 | EXPORT_SYMBOL_GPL(opal_notifier_unregister); | |
1bc98de2 | 251 | |
9f0fd049 | 252 | void opal_do_notifier(uint64_t events) |
1bc98de2 GS |
253 | { |
254 | unsigned long flags; | |
255 | uint64_t changed_mask; | |
256 | ||
257 | if (atomic_read(&opal_notifier_hold)) | |
258 | return; | |
259 | ||
260 | spin_lock_irqsave(&opal_notifier_lock, flags); | |
261 | changed_mask = last_notified_mask ^ events; | |
262 | last_notified_mask = events; | |
263 | spin_unlock_irqrestore(&opal_notifier_lock, flags); | |
264 | ||
265 | /* | |
266 | * We feed with the event bits and changed bits for | |
267 | * enough information to the callback. | |
268 | */ | |
269 | atomic_notifier_call_chain(&opal_notifier_head, | |
270 | events, (void *)changed_mask); | |
271 | } | |
272 | ||
273 | void opal_notifier_update_evt(uint64_t evt_mask, | |
274 | uint64_t evt_val) | |
275 | { | |
276 | unsigned long flags; | |
277 | ||
278 | spin_lock_irqsave(&opal_notifier_lock, flags); | |
279 | last_notified_mask &= ~evt_mask; | |
280 | last_notified_mask |= evt_val; | |
281 | spin_unlock_irqrestore(&opal_notifier_lock, flags); | |
282 | } | |
283 | ||
284 | void opal_notifier_enable(void) | |
285 | { | |
286 | int64_t rc; | |
56b4c993 | 287 | __be64 evt = 0; |
1bc98de2 GS |
288 | |
289 | atomic_set(&opal_notifier_hold, 0); | |
290 | ||
291 | /* Process pending events */ | |
292 | rc = opal_poll_events(&evt); | |
293 | if (rc == OPAL_SUCCESS && evt) | |
56b4c993 | 294 | opal_do_notifier(be64_to_cpu(evt)); |
1bc98de2 GS |
295 | } |
296 | ||
297 | void opal_notifier_disable(void) | |
298 | { | |
299 | atomic_set(&opal_notifier_hold, 1); | |
300 | } | |
301 | ||
24366360 MS |
302 | /* |
303 | * Opal message notifier based on message type. Allow subscribers to get | |
304 | * notified for specific messgae type. | |
305 | */ | |
d7cf83fc | 306 | int opal_message_notifier_register(enum opal_msg_type msg_type, |
24366360 MS |
307 | struct notifier_block *nb) |
308 | { | |
792f96e9 NG |
309 | if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { |
310 | pr_warning("%s: Invalid arguments, msg_type:%d\n", | |
24366360 MS |
311 | __func__, msg_type); |
312 | return -EINVAL; | |
313 | } | |
792f96e9 | 314 | |
24366360 MS |
315 | return atomic_notifier_chain_register( |
316 | &opal_msg_notifier_head[msg_type], nb); | |
317 | } | |
318 | ||
df60f576 | 319 | int opal_message_notifier_unregister(enum opal_msg_type msg_type, |
b921e902 NG |
320 | struct notifier_block *nb) |
321 | { | |
322 | return atomic_notifier_chain_unregister( | |
323 | &opal_msg_notifier_head[msg_type], nb); | |
324 | } | |
325 | ||
24366360 MS |
326 | static void opal_message_do_notify(uint32_t msg_type, void *msg) |
327 | { | |
328 | /* notify subscribers */ | |
329 | atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], | |
330 | msg_type, msg); | |
331 | } | |
332 | ||
333 | static void opal_handle_message(void) | |
334 | { | |
335 | s64 ret; | |
336 | /* | |
337 | * TODO: pre-allocate a message buffer depending on opal-msg-size | |
338 | * value in /proc/device-tree. | |
339 | */ | |
340 | static struct opal_msg msg; | |
bb4398e1 | 341 | u32 type; |
24366360 MS |
342 | |
343 | ret = opal_get_msg(__pa(&msg), sizeof(msg)); | |
344 | /* No opal message pending. */ | |
345 | if (ret == OPAL_RESOURCE) | |
346 | return; | |
347 | ||
348 | /* check for errors. */ | |
349 | if (ret) { | |
1a84db56 | 350 | pr_warning("%s: Failed to retrieve opal message, err=%lld\n", |
24366360 MS |
351 | __func__, ret); |
352 | return; | |
353 | } | |
354 | ||
bb4398e1 AB |
355 | type = be32_to_cpu(msg.msg_type); |
356 | ||
24366360 | 357 | /* Sanity check */ |
792f96e9 | 358 | if (type >= OPAL_MSG_TYPE_MAX) { |
bb4398e1 | 359 | pr_warning("%s: Unknown message type: %u\n", __func__, type); |
24366360 MS |
360 | return; |
361 | } | |
bb4398e1 | 362 | opal_message_do_notify(type, (void *)&msg); |
24366360 MS |
363 | } |
364 | ||
365 | static int opal_message_notify(struct notifier_block *nb, | |
366 | unsigned long events, void *change) | |
367 | { | |
368 | if (events & OPAL_EVENT_MSG_PENDING) | |
369 | opal_handle_message(); | |
370 | return 0; | |
371 | } | |
372 | ||
373 | static struct notifier_block opal_message_nb = { | |
374 | .notifier_call = opal_message_notify, | |
375 | .next = NULL, | |
376 | .priority = 0, | |
377 | }; | |
378 | ||
379 | static int __init opal_message_init(void) | |
380 | { | |
381 | int ret, i; | |
382 | ||
383 | for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) | |
384 | ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); | |
385 | ||
386 | ret = opal_notifier_register(&opal_message_nb); | |
387 | if (ret) { | |
388 | pr_err("%s: Can't register OPAL event notifier (%d)\n", | |
389 | __func__, ret); | |
390 | return ret; | |
391 | } | |
392 | return 0; | |
393 | } | |
24366360 | 394 | |
14a43e69 BH |
395 | int opal_get_chars(uint32_t vtermno, char *buf, int count) |
396 | { | |
4f89363b BH |
397 | s64 rc; |
398 | __be64 evt, len; | |
14a43e69 BH |
399 | |
400 | if (!opal.entry) | |
daea1175 | 401 | return -ENODEV; |
14a43e69 | 402 | opal_poll_events(&evt); |
4f89363b | 403 | if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) |
14a43e69 | 404 | return 0; |
4f89363b | 405 | len = cpu_to_be64(count); |
9d0c4dfe | 406 | rc = opal_console_read(vtermno, &len, buf); |
14a43e69 | 407 | if (rc == OPAL_SUCCESS) |
4f89363b | 408 | return be64_to_cpu(len); |
14a43e69 BH |
409 | return 0; |
410 | } | |
411 | ||
412 | int opal_put_chars(uint32_t vtermno, const char *data, int total_len) | |
413 | { | |
414 | int written = 0; | |
4f89363b | 415 | __be64 olen; |
daea1175 | 416 | s64 len, rc; |
14a43e69 | 417 | unsigned long flags; |
4f89363b | 418 | __be64 evt; |
14a43e69 BH |
419 | |
420 | if (!opal.entry) | |
daea1175 | 421 | return -ENODEV; |
14a43e69 BH |
422 | |
423 | /* We want put_chars to be atomic to avoid mangling of hvsi | |
424 | * packets. To do that, we first test for room and return | |
daea1175 BH |
425 | * -EAGAIN if there isn't enough. |
426 | * | |
427 | * Unfortunately, opal_console_write_buffer_space() doesn't | |
428 | * appear to work on opal v1, so we just assume there is | |
429 | * enough room and be done with it | |
14a43e69 BH |
430 | */ |
431 | spin_lock_irqsave(&opal_write_lock, flags); | |
daea1175 | 432 | if (firmware_has_feature(FW_FEATURE_OPALv2)) { |
4f89363b BH |
433 | rc = opal_console_write_buffer_space(vtermno, &olen); |
434 | len = be64_to_cpu(olen); | |
daea1175 BH |
435 | if (rc || len < total_len) { |
436 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
437 | /* Closed -> drop characters */ | |
438 | if (rc) | |
439 | return total_len; | |
4f89363b | 440 | opal_poll_events(NULL); |
daea1175 BH |
441 | return -EAGAIN; |
442 | } | |
14a43e69 BH |
443 | } |
444 | ||
445 | /* We still try to handle partial completions, though they | |
446 | * should no longer happen. | |
447 | */ | |
daea1175 | 448 | rc = OPAL_BUSY; |
14a43e69 BH |
449 | while(total_len > 0 && (rc == OPAL_BUSY || |
450 | rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { | |
4f89363b BH |
451 | olen = cpu_to_be64(total_len); |
452 | rc = opal_console_write(vtermno, &olen, data); | |
453 | len = be64_to_cpu(olen); | |
1de1455f BH |
454 | |
455 | /* Closed or other error drop */ | |
456 | if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && | |
457 | rc != OPAL_BUSY_EVENT) { | |
458 | written = total_len; | |
459 | break; | |
460 | } | |
14a43e69 BH |
461 | if (rc == OPAL_SUCCESS) { |
462 | total_len -= len; | |
463 | data += len; | |
464 | written += len; | |
465 | } | |
466 | /* This is a bit nasty but we need that for the console to | |
467 | * flush when there aren't any interrupts. We will clean | |
468 | * things a bit later to limit that to synchronous path | |
469 | * such as the kernel console and xmon/udbg | |
470 | */ | |
471 | do | |
472 | opal_poll_events(&evt); | |
4f89363b BH |
473 | while(rc == OPAL_SUCCESS && |
474 | (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); | |
14a43e69 BH |
475 | } |
476 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
477 | return written; | |
478 | } | |
479 | ||
b63a0ffe MS |
480 | static int opal_recover_mce(struct pt_regs *regs, |
481 | struct machine_check_event *evt) | |
482 | { | |
483 | int recovered = 0; | |
484 | uint64_t ea = get_mce_fault_addr(evt); | |
485 | ||
486 | if (!(regs->msr & MSR_RI)) { | |
487 | /* If MSR_RI isn't set, we cannot recover */ | |
488 | recovered = 0; | |
489 | } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { | |
490 | /* Platform corrected itself */ | |
491 | recovered = 1; | |
492 | } else if (ea && !is_kernel_addr(ea)) { | |
493 | /* | |
494 | * Faulting address is not in kernel text. We should be fine. | |
495 | * We need to find which process uses this address. | |
496 | * For now, kill the task if we have received exception when | |
497 | * in userspace. | |
498 | * | |
499 | * TODO: Queue up this address for hwpoisioning later. | |
500 | */ | |
501 | if (user_mode(regs) && !is_global_init(current)) { | |
502 | _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); | |
503 | recovered = 1; | |
504 | } else | |
505 | recovered = 0; | |
506 | } else if (user_mode(regs) && !is_global_init(current) && | |
507 | evt->severity == MCE_SEV_ERROR_SYNC) { | |
508 | /* | |
509 | * If we have received a synchronous error when in userspace | |
510 | * kill the task. | |
511 | */ | |
512 | _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); | |
513 | recovered = 1; | |
514 | } | |
515 | return recovered; | |
516 | } | |
517 | ||
ed79ba9e BH |
518 | int opal_machine_check(struct pt_regs *regs) |
519 | { | |
36df96f8 | 520 | struct machine_check_event evt; |
ed79ba9e | 521 | |
36df96f8 MS |
522 | if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) |
523 | return 0; | |
ed79ba9e BH |
524 | |
525 | /* Print things out */ | |
36df96f8 | 526 | if (evt.version != MCE_V1) { |
ed79ba9e BH |
527 | pr_err("Machine Check Exception, Unknown event version %d !\n", |
528 | evt.version); | |
529 | return 0; | |
530 | } | |
b5ff4211 | 531 | machine_check_print_event_info(&evt); |
ed79ba9e | 532 | |
b63a0ffe MS |
533 | if (opal_recover_mce(regs, &evt)) |
534 | return 1; | |
535 | return 0; | |
ed79ba9e BH |
536 | } |
537 | ||
0869b6fd MS |
538 | /* Early hmi handler called in real mode. */ |
539 | int opal_hmi_exception_early(struct pt_regs *regs) | |
540 | { | |
0ef95b41 MS |
541 | s64 rc; |
542 | ||
543 | /* | |
544 | * call opal hmi handler. Pass paca address as token. | |
545 | * The return value OPAL_SUCCESS is an indication that there is | |
546 | * an HMI event generated waiting to pull by Linux. | |
547 | */ | |
548 | rc = opal_handle_hmi(); | |
549 | if (rc == OPAL_SUCCESS) { | |
550 | local_paca->hmi_event_available = 1; | |
551 | return 1; | |
552 | } | |
0869b6fd MS |
553 | return 0; |
554 | } | |
555 | ||
556 | /* HMI exception handler called in virtual mode during check_irq_replay. */ | |
557 | int opal_handle_hmi_exception(struct pt_regs *regs) | |
558 | { | |
0ef95b41 MS |
559 | s64 rc; |
560 | __be64 evt = 0; | |
561 | ||
562 | /* | |
563 | * Check if HMI event is available. | |
564 | * if Yes, then call opal_poll_events to pull opal messages and | |
565 | * process them. | |
566 | */ | |
567 | if (!local_paca->hmi_event_available) | |
568 | return 0; | |
569 | ||
570 | local_paca->hmi_event_available = 0; | |
571 | rc = opal_poll_events(&evt); | |
9f0fd049 | 572 | if (rc == OPAL_SUCCESS && evt) { |
0ef95b41 | 573 | opal_do_notifier(be64_to_cpu(evt)); |
9f0fd049 AP |
574 | opal_handle_events(be64_to_cpu(evt)); |
575 | } | |
0ef95b41 MS |
576 | |
577 | return 1; | |
0869b6fd MS |
578 | } |
579 | ||
55672ecf MS |
580 | static uint64_t find_recovery_address(uint64_t nip) |
581 | { | |
582 | int i; | |
583 | ||
584 | for (i = 0; i < mc_recoverable_range_len; i++) | |
585 | if ((nip >= mc_recoverable_range[i].start_addr) && | |
586 | (nip < mc_recoverable_range[i].end_addr)) | |
587 | return mc_recoverable_range[i].recover_addr; | |
588 | return 0; | |
589 | } | |
590 | ||
591 | bool opal_mce_check_early_recovery(struct pt_regs *regs) | |
592 | { | |
593 | uint64_t recover_addr = 0; | |
594 | ||
595 | if (!opal.base || !opal.size) | |
596 | goto out; | |
597 | ||
598 | if ((regs->nip >= opal.base) && | |
599 | (regs->nip <= (opal.base + opal.size))) | |
600 | recover_addr = find_recovery_address(regs->nip); | |
601 | ||
602 | /* | |
603 | * Setup regs->nip to rfi into fixup address. | |
604 | */ | |
605 | if (recover_addr) | |
606 | regs->nip = recover_addr; | |
607 | ||
608 | out: | |
609 | return !!recover_addr; | |
610 | } | |
611 | ||
6f68b5e2 VH |
612 | static int opal_sysfs_init(void) |
613 | { | |
614 | opal_kobj = kobject_create_and_add("opal", firmware_kobj); | |
615 | if (!opal_kobj) { | |
616 | pr_warn("kobject_create_and_add opal failed\n"); | |
617 | return -ENOMEM; | |
618 | } | |
619 | ||
620 | return 0; | |
621 | } | |
622 | ||
c8742f85 BH |
623 | static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, |
624 | struct bin_attribute *bin_attr, | |
625 | char *buf, loff_t off, size_t count) | |
626 | { | |
627 | return memory_read_from_buffer(buf, count, &off, bin_attr->private, | |
628 | bin_attr->size); | |
629 | } | |
630 | ||
631 | static BIN_ATTR_RO(symbol_map, 0); | |
632 | ||
633 | static void opal_export_symmap(void) | |
634 | { | |
635 | const __be64 *syms; | |
636 | unsigned int size; | |
637 | struct device_node *fw; | |
638 | int rc; | |
639 | ||
640 | fw = of_find_node_by_path("/ibm,opal/firmware"); | |
641 | if (!fw) | |
642 | return; | |
643 | syms = of_get_property(fw, "symbol-map", &size); | |
644 | if (!syms || size != 2 * sizeof(__be64)) | |
645 | return; | |
646 | ||
647 | /* Setup attributes */ | |
648 | bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); | |
649 | bin_attr_symbol_map.size = be64_to_cpu(syms[1]); | |
650 | ||
651 | rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); | |
652 | if (rc) | |
653 | pr_warn("Error %d creating OPAL symbols file\n", rc); | |
654 | } | |
655 | ||
b09c2ec4 VH |
656 | static void __init opal_dump_region_init(void) |
657 | { | |
658 | void *addr; | |
659 | uint64_t size; | |
660 | int rc; | |
661 | ||
b962f5a4 SS |
662 | if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) |
663 | return; | |
664 | ||
b09c2ec4 VH |
665 | /* Register kernel log buffer */ |
666 | addr = log_buf_addr_get(); | |
6501ab5e PK |
667 | if (addr == NULL) |
668 | return; | |
669 | ||
b09c2ec4 | 670 | size = log_buf_len_get(); |
6501ab5e PK |
671 | if (size == 0) |
672 | return; | |
673 | ||
b09c2ec4 VH |
674 | rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, |
675 | __pa(addr), size); | |
676 | /* Don't warn if this is just an older OPAL that doesn't | |
677 | * know about that call | |
678 | */ | |
679 | if (rc && rc != OPAL_UNSUPPORTED) | |
680 | pr_warn("DUMP: Failed to register kernel log buffer. " | |
681 | "rc = %d\n", rc); | |
682 | } | |
608b286d | 683 | |
ed59190e CB |
684 | static void opal_flash_init(struct device_node *opal_node) |
685 | { | |
686 | struct device_node *np; | |
687 | ||
688 | for_each_child_of_node(opal_node, np) | |
689 | if (of_device_is_compatible(np, "ibm,opal-flash")) | |
690 | of_platform_device_create(np, NULL, NULL); | |
691 | } | |
692 | ||
608b286d JK |
693 | static void opal_ipmi_init(struct device_node *opal_node) |
694 | { | |
695 | struct device_node *np; | |
696 | ||
697 | for_each_child_of_node(opal_node, np) | |
698 | if (of_device_is_compatible(np, "ibm,opal-ipmi")) | |
699 | of_platform_device_create(np, NULL, NULL); | |
700 | } | |
701 | ||
47083450 NG |
702 | static void opal_i2c_create_devs(void) |
703 | { | |
704 | struct device_node *np; | |
705 | ||
706 | for_each_compatible_node(np, NULL, "ibm,opal-i2c") | |
707 | of_platform_device_create(np, NULL, NULL); | |
708 | } | |
709 | ||
3bf57561 BH |
710 | static int kopald(void *unused) |
711 | { | |
9f0fd049 AP |
712 | __be64 events; |
713 | ||
3bf57561 BH |
714 | set_freezable(); |
715 | do { | |
716 | try_to_freeze(); | |
9f0fd049 AP |
717 | opal_poll_events(&events); |
718 | opal_handle_events(be64_to_cpu(events)); | |
3bf57561 BH |
719 | msleep_interruptible(opal_heartbeat); |
720 | } while (!kthread_should_stop()); | |
721 | ||
722 | return 0; | |
723 | } | |
724 | ||
725 | static void opal_init_heartbeat(void) | |
726 | { | |
727 | /* Old firwmware, we assume the HVC heartbeat is sufficient */ | |
728 | if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", | |
729 | &opal_heartbeat) != 0) | |
730 | opal_heartbeat = 0; | |
731 | ||
732 | if (opal_heartbeat) | |
733 | kthread_run(kopald, NULL, "kopald"); | |
734 | } | |
735 | ||
14a43e69 BH |
736 | static int __init opal_init(void) |
737 | { | |
738 | struct device_node *np, *consoles; | |
c1c3a526 | 739 | int rc; |
14a43e69 BH |
740 | |
741 | opal_node = of_find_node_by_path("/ibm,opal"); | |
742 | if (!opal_node) { | |
08135139 | 743 | pr_warn("Device node not found\n"); |
14a43e69 BH |
744 | return -ENODEV; |
745 | } | |
2db29d28 | 746 | |
9f0fd049 AP |
747 | /* Initialise OPAL events */ |
748 | opal_event_init(); | |
749 | ||
2db29d28 | 750 | /* Register OPAL consoles if any ports */ |
14a43e69 BH |
751 | if (firmware_has_feature(FW_FEATURE_OPALv2)) |
752 | consoles = of_find_node_by_path("/ibm,opal/consoles"); | |
753 | else | |
754 | consoles = of_node_get(opal_node); | |
2db29d28 BH |
755 | if (consoles) { |
756 | for_each_child_of_node(consoles, np) { | |
757 | if (strcmp(np->name, "serial")) | |
758 | continue; | |
759 | of_platform_device_create(np, NULL, NULL); | |
760 | } | |
761 | of_node_put(consoles); | |
14a43e69 | 762 | } |
a125e092 | 763 | |
96e023e7 AP |
764 | /* Initialise OPAL messaging system */ |
765 | opal_message_init(); | |
766 | ||
767 | /* Initialise OPAL asynchronous completion interface */ | |
768 | opal_async_comp_init(); | |
769 | ||
770 | /* Initialise OPAL sensor interface */ | |
771 | opal_sensor_init(); | |
772 | ||
773 | /* Initialise OPAL hypervisor maintainence interrupt handling */ | |
774 | opal_hmi_handler_init(); | |
775 | ||
47083450 NG |
776 | /* Create i2c platform devices */ |
777 | opal_i2c_create_devs(); | |
778 | ||
3bf57561 BH |
779 | /* Setup a heatbeat thread if requested by OPAL */ |
780 | opal_init_heartbeat(); | |
781 | ||
6f68b5e2 VH |
782 | /* Create "opal" kobject under /sys/firmware */ |
783 | rc = opal_sysfs_init(); | |
50bd6153 | 784 | if (rc == 0) { |
c8742f85 BH |
785 | /* Export symbol map to userspace */ |
786 | opal_export_symmap(); | |
b09c2ec4 VH |
787 | /* Setup dump region interface */ |
788 | opal_dump_region_init(); | |
774fea1a SS |
789 | /* Setup error log interface */ |
790 | rc = opal_elog_init(); | |
50bd6153 | 791 | /* Setup code update interface */ |
ed59190e | 792 | opal_flash_update_init(); |
c7e64b9c SS |
793 | /* Setup platform dump extract interface */ |
794 | opal_platform_dump_init(); | |
4029cd66 NG |
795 | /* Setup system parameters interface */ |
796 | opal_sys_param_init(); | |
bfc36894 JS |
797 | /* Setup message log interface. */ |
798 | opal_msglog_init(); | |
50bd6153 | 799 | } |
6f68b5e2 | 800 | |
3bf57561 | 801 | /* Initialize OPAL IPMI backend */ |
608b286d JK |
802 | opal_ipmi_init(opal_node); |
803 | ||
ed59190e CB |
804 | opal_flash_init(opal_node); |
805 | ||
14a43e69 BH |
806 | return 0; |
807 | } | |
b14726c5 | 808 | machine_subsys_initcall(powernv, opal_init); |
73ed148a BH |
809 | |
810 | void opal_shutdown(void) | |
811 | { | |
f7d98d18 | 812 | long rc = OPAL_BUSY; |
73ed148a | 813 | |
9f0fd049 | 814 | opal_event_shutdown(); |
f7d98d18 VH |
815 | |
816 | /* | |
817 | * Then sync with OPAL which ensure anything that can | |
818 | * potentially write to our memory has completed such | |
819 | * as an ongoing dump retrieval | |
820 | */ | |
821 | while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
822 | rc = opal_sync_host_reboot(); | |
823 | if (rc == OPAL_BUSY) | |
824 | opal_poll_events(NULL); | |
825 | else | |
826 | mdelay(10); | |
827 | } | |
b09c2ec4 VH |
828 | |
829 | /* Unregister memory dump region */ | |
b962f5a4 SS |
830 | if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) |
831 | opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); | |
73ed148a | 832 | } |
e28b05e7 JS |
833 | |
834 | /* Export this so that test modules can use it */ | |
835 | EXPORT_SYMBOL_GPL(opal_invalid_call); | |
608b286d JK |
836 | EXPORT_SYMBOL_GPL(opal_ipmi_send); |
837 | EXPORT_SYMBOL_GPL(opal_ipmi_recv); | |
ed59190e CB |
838 | EXPORT_SYMBOL_GPL(opal_flash_read); |
839 | EXPORT_SYMBOL_GPL(opal_flash_write); | |
840 | EXPORT_SYMBOL_GPL(opal_flash_erase); | |
3441f04b AB |
841 | |
842 | /* Convert a region of vmalloc memory to an opal sg list */ | |
843 | struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, | |
844 | unsigned long vmalloc_size) | |
845 | { | |
846 | struct opal_sg_list *sg, *first = NULL; | |
847 | unsigned long i = 0; | |
848 | ||
849 | sg = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
850 | if (!sg) | |
851 | goto nomem; | |
852 | ||
853 | first = sg; | |
854 | ||
855 | while (vmalloc_size > 0) { | |
856 | uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; | |
857 | uint64_t length = min(vmalloc_size, PAGE_SIZE); | |
858 | ||
859 | sg->entry[i].data = cpu_to_be64(data); | |
860 | sg->entry[i].length = cpu_to_be64(length); | |
861 | i++; | |
862 | ||
863 | if (i >= SG_ENTRIES_PER_NODE) { | |
864 | struct opal_sg_list *next; | |
865 | ||
866 | next = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
867 | if (!next) | |
868 | goto nomem; | |
869 | ||
870 | sg->length = cpu_to_be64( | |
871 | i * sizeof(struct opal_sg_entry) + 16); | |
872 | i = 0; | |
873 | sg->next = cpu_to_be64(__pa(next)); | |
874 | sg = next; | |
875 | } | |
876 | ||
877 | vmalloc_addr += length; | |
878 | vmalloc_size -= length; | |
879 | } | |
880 | ||
881 | sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); | |
882 | ||
883 | return first; | |
884 | ||
885 | nomem: | |
886 | pr_err("%s : Failed to allocate memory\n", __func__); | |
887 | opal_free_sg_list(first); | |
888 | return NULL; | |
889 | } | |
890 | ||
891 | void opal_free_sg_list(struct opal_sg_list *sg) | |
892 | { | |
893 | while (sg) { | |
894 | uint64_t next = be64_to_cpu(sg->next); | |
895 | ||
896 | kfree(sg); | |
897 | ||
898 | if (next) | |
899 | sg = __va(next); | |
900 | else | |
901 | sg = NULL; | |
902 | } | |
903 | } | |
16b1d26e | 904 | |
e3c5c2e0 CLG |
905 | int opal_error_code(int rc) |
906 | { | |
907 | switch (rc) { | |
908 | case OPAL_SUCCESS: return 0; | |
909 | ||
910 | case OPAL_PARAMETER: return -EINVAL; | |
911 | case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; | |
912 | case OPAL_BUSY_EVENT: return -EBUSY; | |
913 | case OPAL_NO_MEM: return -ENOMEM; | |
914 | ||
915 | case OPAL_UNSUPPORTED: return -EIO; | |
916 | case OPAL_HARDWARE: return -EIO; | |
917 | case OPAL_INTERNAL_ERROR: return -EIO; | |
918 | default: | |
919 | pr_err("%s: unexpected OPAL error %d\n", __func__, rc); | |
920 | return -EIO; | |
921 | } | |
922 | } | |
923 | ||
16b1d26e NG |
924 | EXPORT_SYMBOL_GPL(opal_poll_events); |
925 | EXPORT_SYMBOL_GPL(opal_rtc_read); | |
926 | EXPORT_SYMBOL_GPL(opal_rtc_write); | |
927 | EXPORT_SYMBOL_GPL(opal_tpo_read); | |
928 | EXPORT_SYMBOL_GPL(opal_tpo_write); | |
47083450 | 929 | EXPORT_SYMBOL_GPL(opal_i2c_request); |