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