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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); |
24366360 | 56 | static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; |
3bf57561 | 57 | static uint32_t opal_heartbeat; |
14a43e69 | 58 | |
4926616c BH |
59 | static void opal_reinit_cores(void) |
60 | { | |
61 | /* Do the actual re-init, This will clobber all FPRs, VRs, etc... | |
62 | * | |
63 | * It will preserve non volatile GPRs and HSPRG0/1. It will | |
64 | * also restore HIDs and other SPRs to their original value | |
65 | * but it might clobber a bunch. | |
66 | */ | |
67 | #ifdef __BIG_ENDIAN__ | |
68 | opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); | |
69 | #else | |
70 | opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); | |
71 | #endif | |
72 | } | |
73 | ||
14a43e69 BH |
74 | int __init early_init_dt_scan_opal(unsigned long node, |
75 | const char *uname, int depth, void *data) | |
76 | { | |
55672ecf | 77 | const void *basep, *entryp, *sizep; |
9d0c4dfe | 78 | int basesz, entrysz, runtimesz; |
14a43e69 BH |
79 | |
80 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
81 | return 0; | |
82 | ||
83 | basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); | |
84 | entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); | |
55672ecf | 85 | sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); |
14a43e69 | 86 | |
55672ecf | 87 | if (!basep || !entryp || !sizep) |
14a43e69 BH |
88 | return 1; |
89 | ||
90 | opal.base = of_read_number(basep, basesz/4); | |
91 | opal.entry = of_read_number(entryp, entrysz/4); | |
55672ecf | 92 | opal.size = of_read_number(sizep, runtimesz/4); |
14a43e69 | 93 | |
9d0c4dfe | 94 | pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", |
14a43e69 | 95 | opal.base, basep, basesz); |
9d0c4dfe | 96 | pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", |
14a43e69 | 97 | opal.entry, entryp, entrysz); |
9d0c4dfe | 98 | pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", |
55672ecf | 99 | opal.size, sizep, runtimesz); |
14a43e69 | 100 | |
75b93da4 | 101 | if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { |
e4d54f71 SS |
102 | powerpc_firmware_features |= FW_FEATURE_OPAL; |
103 | pr_info("OPAL detected !\n"); | |
14a43e69 | 104 | } else { |
786842b6 | 105 | panic("OPAL != V3 detected, no longer supported.\n"); |
14a43e69 BH |
106 | } |
107 | ||
4926616c BH |
108 | /* Reinit all cores with the right endian */ |
109 | opal_reinit_cores(); | |
110 | ||
111 | /* Restore some bits */ | |
112 | if (cur_cpu_spec->cpu_restore) | |
113 | cur_cpu_spec->cpu_restore(); | |
114 | ||
c4463b37 JK |
115 | return 1; |
116 | } | |
117 | ||
55672ecf MS |
118 | int __init early_init_dt_scan_recoverable_ranges(unsigned long node, |
119 | const char *uname, int depth, void *data) | |
120 | { | |
9d0c4dfe | 121 | int i, psize, size; |
55672ecf MS |
122 | const __be32 *prop; |
123 | ||
124 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
125 | return 0; | |
126 | ||
6e556b47 | 127 | prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); |
55672ecf MS |
128 | |
129 | if (!prop) | |
130 | return 1; | |
131 | ||
132 | pr_debug("Found machine check recoverable ranges.\n"); | |
133 | ||
6e556b47 MS |
134 | /* |
135 | * Calculate number of available entries. | |
136 | * | |
137 | * Each recoverable address range entry is (start address, len, | |
138 | * recovery address), 2 cells each for start and recovery address, | |
139 | * 1 cell for len, totalling 5 cells per entry. | |
140 | */ | |
141 | mc_recoverable_range_len = psize / (sizeof(*prop) * 5); | |
142 | ||
143 | /* Sanity check */ | |
144 | if (!mc_recoverable_range_len) | |
145 | return 1; | |
146 | ||
147 | /* Size required to hold all the entries. */ | |
148 | size = mc_recoverable_range_len * | |
149 | sizeof(struct mcheck_recoverable_range); | |
150 | ||
55672ecf MS |
151 | /* |
152 | * Allocate a buffer to hold the MC recoverable ranges. We would be | |
153 | * accessing them in real mode, hence it needs to be within | |
154 | * RMO region. | |
155 | */ | |
156 | mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), | |
157 | ppc64_rma_size)); | |
158 | memset(mc_recoverable_range, 0, size); | |
159 | ||
6e556b47 | 160 | for (i = 0; i < mc_recoverable_range_len; i++) { |
55672ecf MS |
161 | mc_recoverable_range[i].start_addr = |
162 | of_read_number(prop + (i * 5) + 0, 2); | |
163 | mc_recoverable_range[i].end_addr = | |
164 | mc_recoverable_range[i].start_addr + | |
165 | of_read_number(prop + (i * 5) + 2, 1); | |
166 | mc_recoverable_range[i].recover_addr = | |
167 | of_read_number(prop + (i * 5) + 3, 2); | |
168 | ||
169 | pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", | |
170 | mc_recoverable_range[i].start_addr, | |
171 | mc_recoverable_range[i].end_addr, | |
172 | mc_recoverable_range[i].recover_addr); | |
173 | } | |
55672ecf MS |
174 | return 1; |
175 | } | |
176 | ||
c4463b37 JK |
177 | static int __init opal_register_exception_handlers(void) |
178 | { | |
29186097 | 179 | #ifdef __BIG_ENDIAN__ |
c4463b37 JK |
180 | u64 glue; |
181 | ||
182 | if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) | |
183 | return -ENODEV; | |
184 | ||
28446de2 MS |
185 | /* Hookup some exception handlers except machine check. We use the |
186 | * fwnmi area at 0x7000 to provide the glue space to OPAL | |
ed79ba9e BH |
187 | */ |
188 | glue = 0x7000; | |
6507955c MS |
189 | |
190 | /* | |
191 | * Check if we are running on newer firmware that exports | |
192 | * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch | |
193 | * the HMI interrupt and we catch it directly in Linux. | |
194 | * | |
195 | * For older firmware (i.e currently released POWER8 System Firmware | |
196 | * as of today <= SV810_087), we fallback to old behavior and let OPAL | |
197 | * patch the HMI vector and handle it inside OPAL firmware. | |
198 | * | |
199 | * For newer firmware (in development/yet to be released) we will | |
200 | * start catching/handling HMI directly in Linux. | |
201 | */ | |
202 | if (!opal_check_token(OPAL_HANDLE_HMI)) { | |
08135139 | 203 | pr_info("Old firmware detected, OPAL handles HMIs.\n"); |
6507955c MS |
204 | opal_register_exception_handler( |
205 | OPAL_HYPERVISOR_MAINTENANCE_HANDLER, | |
206 | 0, glue); | |
207 | glue += 128; | |
208 | } | |
209 | ||
ed79ba9e | 210 | opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); |
29186097 | 211 | #endif |
ed79ba9e | 212 | |
c4463b37 | 213 | return 0; |
14a43e69 | 214 | } |
b14726c5 | 215 | machine_early_initcall(powernv, opal_register_exception_handlers); |
c4463b37 | 216 | |
24366360 MS |
217 | /* |
218 | * Opal message notifier based on message type. Allow subscribers to get | |
219 | * notified for specific messgae type. | |
220 | */ | |
d7cf83fc | 221 | int opal_message_notifier_register(enum opal_msg_type msg_type, |
24366360 MS |
222 | struct notifier_block *nb) |
223 | { | |
792f96e9 NG |
224 | if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { |
225 | pr_warning("%s: Invalid arguments, msg_type:%d\n", | |
24366360 MS |
226 | __func__, msg_type); |
227 | return -EINVAL; | |
228 | } | |
792f96e9 | 229 | |
24366360 MS |
230 | return atomic_notifier_chain_register( |
231 | &opal_msg_notifier_head[msg_type], nb); | |
232 | } | |
594fcb9e | 233 | EXPORT_SYMBOL_GPL(opal_message_notifier_register); |
24366360 | 234 | |
df60f576 | 235 | int opal_message_notifier_unregister(enum opal_msg_type msg_type, |
b921e902 NG |
236 | struct notifier_block *nb) |
237 | { | |
238 | return atomic_notifier_chain_unregister( | |
239 | &opal_msg_notifier_head[msg_type], nb); | |
240 | } | |
594fcb9e | 241 | EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); |
b921e902 | 242 | |
24366360 MS |
243 | static void opal_message_do_notify(uint32_t msg_type, void *msg) |
244 | { | |
245 | /* notify subscribers */ | |
246 | atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], | |
247 | msg_type, msg); | |
248 | } | |
249 | ||
250 | static void opal_handle_message(void) | |
251 | { | |
252 | s64 ret; | |
253 | /* | |
254 | * TODO: pre-allocate a message buffer depending on opal-msg-size | |
255 | * value in /proc/device-tree. | |
256 | */ | |
257 | static struct opal_msg msg; | |
bb4398e1 | 258 | u32 type; |
24366360 MS |
259 | |
260 | ret = opal_get_msg(__pa(&msg), sizeof(msg)); | |
261 | /* No opal message pending. */ | |
262 | if (ret == OPAL_RESOURCE) | |
263 | return; | |
264 | ||
265 | /* check for errors. */ | |
266 | if (ret) { | |
1a84db56 | 267 | pr_warning("%s: Failed to retrieve opal message, err=%lld\n", |
24366360 MS |
268 | __func__, ret); |
269 | return; | |
270 | } | |
271 | ||
bb4398e1 AB |
272 | type = be32_to_cpu(msg.msg_type); |
273 | ||
24366360 | 274 | /* Sanity check */ |
792f96e9 | 275 | if (type >= OPAL_MSG_TYPE_MAX) { |
98da62b7 | 276 | pr_warn_once("%s: Unknown message type: %u\n", __func__, type); |
24366360 MS |
277 | return; |
278 | } | |
bb4398e1 | 279 | opal_message_do_notify(type, (void *)&msg); |
24366360 MS |
280 | } |
281 | ||
a295af24 | 282 | static irqreturn_t opal_message_notify(int irq, void *data) |
24366360 | 283 | { |
a295af24 AP |
284 | opal_handle_message(); |
285 | return IRQ_HANDLED; | |
24366360 MS |
286 | } |
287 | ||
24366360 MS |
288 | static int __init opal_message_init(void) |
289 | { | |
a295af24 | 290 | int ret, i, irq; |
24366360 MS |
291 | |
292 | for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) | |
293 | ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); | |
294 | ||
a295af24 AP |
295 | irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); |
296 | if (!irq) { | |
297 | pr_err("%s: Can't register OPAL event irq (%d)\n", | |
298 | __func__, irq); | |
299 | return irq; | |
300 | } | |
301 | ||
302 | ret = request_irq(irq, opal_message_notify, | |
303 | IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); | |
24366360 | 304 | if (ret) { |
a295af24 | 305 | pr_err("%s: Can't request OPAL event irq (%d)\n", |
24366360 MS |
306 | __func__, ret); |
307 | return ret; | |
308 | } | |
a295af24 | 309 | |
24366360 MS |
310 | return 0; |
311 | } | |
24366360 | 312 | |
14a43e69 BH |
313 | int opal_get_chars(uint32_t vtermno, char *buf, int count) |
314 | { | |
4f89363b BH |
315 | s64 rc; |
316 | __be64 evt, len; | |
14a43e69 BH |
317 | |
318 | if (!opal.entry) | |
daea1175 | 319 | return -ENODEV; |
14a43e69 | 320 | opal_poll_events(&evt); |
4f89363b | 321 | if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) |
14a43e69 | 322 | return 0; |
4f89363b | 323 | len = cpu_to_be64(count); |
9d0c4dfe | 324 | rc = opal_console_read(vtermno, &len, buf); |
14a43e69 | 325 | if (rc == OPAL_SUCCESS) |
4f89363b | 326 | return be64_to_cpu(len); |
14a43e69 BH |
327 | return 0; |
328 | } | |
329 | ||
330 | int opal_put_chars(uint32_t vtermno, const char *data, int total_len) | |
331 | { | |
332 | int written = 0; | |
4f89363b | 333 | __be64 olen; |
daea1175 | 334 | s64 len, rc; |
14a43e69 | 335 | unsigned long flags; |
4f89363b | 336 | __be64 evt; |
14a43e69 BH |
337 | |
338 | if (!opal.entry) | |
daea1175 | 339 | return -ENODEV; |
14a43e69 BH |
340 | |
341 | /* We want put_chars to be atomic to avoid mangling of hvsi | |
342 | * packets. To do that, we first test for room and return | |
daea1175 BH |
343 | * -EAGAIN if there isn't enough. |
344 | * | |
345 | * Unfortunately, opal_console_write_buffer_space() doesn't | |
346 | * appear to work on opal v1, so we just assume there is | |
347 | * enough room and be done with it | |
14a43e69 BH |
348 | */ |
349 | spin_lock_irqsave(&opal_write_lock, flags); | |
e4d54f71 SS |
350 | rc = opal_console_write_buffer_space(vtermno, &olen); |
351 | len = be64_to_cpu(olen); | |
352 | if (rc || len < total_len) { | |
353 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
354 | /* Closed -> drop characters */ | |
355 | if (rc) | |
356 | return total_len; | |
357 | opal_poll_events(NULL); | |
358 | return -EAGAIN; | |
14a43e69 BH |
359 | } |
360 | ||
361 | /* We still try to handle partial completions, though they | |
362 | * should no longer happen. | |
363 | */ | |
daea1175 | 364 | rc = OPAL_BUSY; |
14a43e69 BH |
365 | while(total_len > 0 && (rc == OPAL_BUSY || |
366 | rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { | |
4f89363b BH |
367 | olen = cpu_to_be64(total_len); |
368 | rc = opal_console_write(vtermno, &olen, data); | |
369 | len = be64_to_cpu(olen); | |
1de1455f BH |
370 | |
371 | /* Closed or other error drop */ | |
372 | if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && | |
373 | rc != OPAL_BUSY_EVENT) { | |
374 | written = total_len; | |
375 | break; | |
376 | } | |
14a43e69 BH |
377 | if (rc == OPAL_SUCCESS) { |
378 | total_len -= len; | |
379 | data += len; | |
380 | written += len; | |
381 | } | |
382 | /* This is a bit nasty but we need that for the console to | |
383 | * flush when there aren't any interrupts. We will clean | |
384 | * things a bit later to limit that to synchronous path | |
385 | * such as the kernel console and xmon/udbg | |
386 | */ | |
387 | do | |
388 | opal_poll_events(&evt); | |
4f89363b BH |
389 | while(rc == OPAL_SUCCESS && |
390 | (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); | |
14a43e69 BH |
391 | } |
392 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
393 | return written; | |
394 | } | |
395 | ||
b63a0ffe MS |
396 | static int opal_recover_mce(struct pt_regs *regs, |
397 | struct machine_check_event *evt) | |
398 | { | |
399 | int recovered = 0; | |
400 | uint64_t ea = get_mce_fault_addr(evt); | |
401 | ||
402 | if (!(regs->msr & MSR_RI)) { | |
403 | /* If MSR_RI isn't set, we cannot recover */ | |
404 | recovered = 0; | |
405 | } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { | |
406 | /* Platform corrected itself */ | |
407 | recovered = 1; | |
408 | } else if (ea && !is_kernel_addr(ea)) { | |
409 | /* | |
410 | * Faulting address is not in kernel text. We should be fine. | |
411 | * We need to find which process uses this address. | |
412 | * For now, kill the task if we have received exception when | |
413 | * in userspace. | |
414 | * | |
415 | * TODO: Queue up this address for hwpoisioning later. | |
416 | */ | |
417 | if (user_mode(regs) && !is_global_init(current)) { | |
418 | _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); | |
419 | recovered = 1; | |
420 | } else | |
421 | recovered = 0; | |
422 | } else if (user_mode(regs) && !is_global_init(current) && | |
423 | evt->severity == MCE_SEV_ERROR_SYNC) { | |
424 | /* | |
425 | * If we have received a synchronous error when in userspace | |
426 | * kill the task. | |
427 | */ | |
428 | _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); | |
429 | recovered = 1; | |
430 | } | |
431 | return recovered; | |
432 | } | |
433 | ||
ed79ba9e BH |
434 | int opal_machine_check(struct pt_regs *regs) |
435 | { | |
36df96f8 | 436 | struct machine_check_event evt; |
e784b649 | 437 | int ret; |
ed79ba9e | 438 | |
36df96f8 MS |
439 | if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) |
440 | return 0; | |
ed79ba9e BH |
441 | |
442 | /* Print things out */ | |
36df96f8 | 443 | if (evt.version != MCE_V1) { |
ed79ba9e BH |
444 | pr_err("Machine Check Exception, Unknown event version %d !\n", |
445 | evt.version); | |
446 | return 0; | |
447 | } | |
b5ff4211 | 448 | machine_check_print_event_info(&evt); |
ed79ba9e | 449 | |
b63a0ffe MS |
450 | if (opal_recover_mce(regs, &evt)) |
451 | return 1; | |
e784b649 MS |
452 | |
453 | /* | |
454 | * Unrecovered machine check, we are heading to panic path. | |
455 | * | |
456 | * We may have hit this MCE in very early stage of kernel | |
457 | * initialization even before opal-prd has started running. If | |
458 | * this is the case then this MCE error may go un-noticed or | |
459 | * un-analyzed if we go down panic path. We need to inform | |
460 | * BMC/OCC about this error so that they can collect relevant | |
461 | * data for error analysis before rebooting. | |
462 | * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so. | |
463 | * This function may not return on BMC based system. | |
464 | */ | |
465 | ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, | |
466 | "Unrecoverable Machine Check exception"); | |
467 | if (ret == OPAL_UNSUPPORTED) { | |
468 | pr_emerg("Reboot type %d not supported\n", | |
469 | OPAL_REBOOT_PLATFORM_ERROR); | |
470 | } | |
471 | ||
472 | /* | |
473 | * We reached here. There can be three possibilities: | |
474 | * 1. We are running on a firmware level that do not support | |
475 | * opal_cec_reboot2() | |
476 | * 2. We are running on a firmware level that do not support | |
477 | * OPAL_REBOOT_PLATFORM_ERROR reboot type. | |
478 | * 3. We are running on FSP based system that does not need opal | |
479 | * to trigger checkstop explicitly for error analysis. The FSP | |
480 | * PRD component would have already got notified about this | |
481 | * error through other channels. | |
482 | * | |
f2dd80ec DA |
483 | * If hardware marked this as an unrecoverable MCE, we are |
484 | * going to panic anyway. Even if it didn't, it's not safe to | |
485 | * continue at this point, so we should explicitly panic. | |
e784b649 | 486 | */ |
f2dd80ec DA |
487 | |
488 | panic("PowerNV Unrecovered Machine Check"); | |
b63a0ffe | 489 | return 0; |
ed79ba9e BH |
490 | } |
491 | ||
0869b6fd MS |
492 | /* Early hmi handler called in real mode. */ |
493 | int opal_hmi_exception_early(struct pt_regs *regs) | |
494 | { | |
0ef95b41 MS |
495 | s64 rc; |
496 | ||
497 | /* | |
498 | * call opal hmi handler. Pass paca address as token. | |
499 | * The return value OPAL_SUCCESS is an indication that there is | |
500 | * an HMI event generated waiting to pull by Linux. | |
501 | */ | |
502 | rc = opal_handle_hmi(); | |
503 | if (rc == OPAL_SUCCESS) { | |
504 | local_paca->hmi_event_available = 1; | |
505 | return 1; | |
506 | } | |
0869b6fd MS |
507 | return 0; |
508 | } | |
509 | ||
510 | /* HMI exception handler called in virtual mode during check_irq_replay. */ | |
511 | int opal_handle_hmi_exception(struct pt_regs *regs) | |
512 | { | |
0ef95b41 MS |
513 | s64 rc; |
514 | __be64 evt = 0; | |
515 | ||
516 | /* | |
517 | * Check if HMI event is available. | |
518 | * if Yes, then call opal_poll_events to pull opal messages and | |
519 | * process them. | |
520 | */ | |
521 | if (!local_paca->hmi_event_available) | |
522 | return 0; | |
523 | ||
524 | local_paca->hmi_event_available = 0; | |
525 | rc = opal_poll_events(&evt); | |
81f2f7ce | 526 | if (rc == OPAL_SUCCESS && evt) |
9f0fd049 | 527 | opal_handle_events(be64_to_cpu(evt)); |
0ef95b41 MS |
528 | |
529 | return 1; | |
0869b6fd MS |
530 | } |
531 | ||
55672ecf MS |
532 | static uint64_t find_recovery_address(uint64_t nip) |
533 | { | |
534 | int i; | |
535 | ||
536 | for (i = 0; i < mc_recoverable_range_len; i++) | |
537 | if ((nip >= mc_recoverable_range[i].start_addr) && | |
538 | (nip < mc_recoverable_range[i].end_addr)) | |
539 | return mc_recoverable_range[i].recover_addr; | |
540 | return 0; | |
541 | } | |
542 | ||
543 | bool opal_mce_check_early_recovery(struct pt_regs *regs) | |
544 | { | |
545 | uint64_t recover_addr = 0; | |
546 | ||
547 | if (!opal.base || !opal.size) | |
548 | goto out; | |
549 | ||
550 | if ((regs->nip >= opal.base) && | |
dc3799bb | 551 | (regs->nip < (opal.base + opal.size))) |
55672ecf MS |
552 | recover_addr = find_recovery_address(regs->nip); |
553 | ||
554 | /* | |
555 | * Setup regs->nip to rfi into fixup address. | |
556 | */ | |
557 | if (recover_addr) | |
558 | regs->nip = recover_addr; | |
559 | ||
560 | out: | |
561 | return !!recover_addr; | |
562 | } | |
563 | ||
6f68b5e2 VH |
564 | static int opal_sysfs_init(void) |
565 | { | |
566 | opal_kobj = kobject_create_and_add("opal", firmware_kobj); | |
567 | if (!opal_kobj) { | |
568 | pr_warn("kobject_create_and_add opal failed\n"); | |
569 | return -ENOMEM; | |
570 | } | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
c8742f85 BH |
575 | static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, |
576 | struct bin_attribute *bin_attr, | |
577 | char *buf, loff_t off, size_t count) | |
578 | { | |
579 | return memory_read_from_buffer(buf, count, &off, bin_attr->private, | |
580 | bin_attr->size); | |
581 | } | |
582 | ||
583 | static BIN_ATTR_RO(symbol_map, 0); | |
584 | ||
585 | static void opal_export_symmap(void) | |
586 | { | |
587 | const __be64 *syms; | |
588 | unsigned int size; | |
589 | struct device_node *fw; | |
590 | int rc; | |
591 | ||
592 | fw = of_find_node_by_path("/ibm,opal/firmware"); | |
593 | if (!fw) | |
594 | return; | |
595 | syms = of_get_property(fw, "symbol-map", &size); | |
596 | if (!syms || size != 2 * sizeof(__be64)) | |
597 | return; | |
598 | ||
599 | /* Setup attributes */ | |
600 | bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); | |
601 | bin_attr_symbol_map.size = be64_to_cpu(syms[1]); | |
602 | ||
603 | rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); | |
604 | if (rc) | |
605 | pr_warn("Error %d creating OPAL symbols file\n", rc); | |
606 | } | |
607 | ||
b09c2ec4 VH |
608 | static void __init opal_dump_region_init(void) |
609 | { | |
610 | void *addr; | |
611 | uint64_t size; | |
612 | int rc; | |
613 | ||
b962f5a4 SS |
614 | if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) |
615 | return; | |
616 | ||
b09c2ec4 VH |
617 | /* Register kernel log buffer */ |
618 | addr = log_buf_addr_get(); | |
6501ab5e PK |
619 | if (addr == NULL) |
620 | return; | |
621 | ||
b09c2ec4 | 622 | size = log_buf_len_get(); |
6501ab5e PK |
623 | if (size == 0) |
624 | return; | |
625 | ||
b09c2ec4 VH |
626 | rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, |
627 | __pa(addr), size); | |
628 | /* Don't warn if this is just an older OPAL that doesn't | |
629 | * know about that call | |
630 | */ | |
631 | if (rc && rc != OPAL_UNSUPPORTED) | |
632 | pr_warn("DUMP: Failed to register kernel log buffer. " | |
633 | "rc = %d\n", rc); | |
634 | } | |
608b286d | 635 | |
48c06154 JK |
636 | static void opal_pdev_init(struct device_node *opal_node, |
637 | const char *compatible) | |
ed59190e CB |
638 | { |
639 | struct device_node *np; | |
640 | ||
641 | for_each_child_of_node(opal_node, np) | |
48c06154 | 642 | if (of_device_is_compatible(np, compatible)) |
608b286d JK |
643 | of_platform_device_create(np, NULL, NULL); |
644 | } | |
645 | ||
47083450 NG |
646 | static void opal_i2c_create_devs(void) |
647 | { | |
648 | struct device_node *np; | |
649 | ||
650 | for_each_compatible_node(np, NULL, "ibm,opal-i2c") | |
651 | of_platform_device_create(np, NULL, NULL); | |
652 | } | |
653 | ||
3bf57561 BH |
654 | static int kopald(void *unused) |
655 | { | |
9f0fd049 AP |
656 | __be64 events; |
657 | ||
3bf57561 BH |
658 | set_freezable(); |
659 | do { | |
660 | try_to_freeze(); | |
9f0fd049 AP |
661 | opal_poll_events(&events); |
662 | opal_handle_events(be64_to_cpu(events)); | |
3bf57561 BH |
663 | msleep_interruptible(opal_heartbeat); |
664 | } while (!kthread_should_stop()); | |
665 | ||
666 | return 0; | |
667 | } | |
668 | ||
669 | static void opal_init_heartbeat(void) | |
670 | { | |
671 | /* Old firwmware, we assume the HVC heartbeat is sufficient */ | |
672 | if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", | |
673 | &opal_heartbeat) != 0) | |
674 | opal_heartbeat = 0; | |
675 | ||
676 | if (opal_heartbeat) | |
677 | kthread_run(kopald, NULL, "kopald"); | |
678 | } | |
679 | ||
14a43e69 BH |
680 | static int __init opal_init(void) |
681 | { | |
c159b596 | 682 | struct device_node *np, *consoles, *leds; |
c1c3a526 | 683 | int rc; |
14a43e69 BH |
684 | |
685 | opal_node = of_find_node_by_path("/ibm,opal"); | |
686 | if (!opal_node) { | |
08135139 | 687 | pr_warn("Device node not found\n"); |
14a43e69 BH |
688 | return -ENODEV; |
689 | } | |
2db29d28 BH |
690 | |
691 | /* Register OPAL consoles if any ports */ | |
7261aafc | 692 | consoles = of_find_node_by_path("/ibm,opal/consoles"); |
2db29d28 BH |
693 | if (consoles) { |
694 | for_each_child_of_node(consoles, np) { | |
695 | if (strcmp(np->name, "serial")) | |
696 | continue; | |
697 | of_platform_device_create(np, NULL, NULL); | |
698 | } | |
699 | of_node_put(consoles); | |
14a43e69 | 700 | } |
a125e092 | 701 | |
96e023e7 AP |
702 | /* Initialise OPAL messaging system */ |
703 | opal_message_init(); | |
704 | ||
705 | /* Initialise OPAL asynchronous completion interface */ | |
706 | opal_async_comp_init(); | |
707 | ||
708 | /* Initialise OPAL sensor interface */ | |
709 | opal_sensor_init(); | |
710 | ||
711 | /* Initialise OPAL hypervisor maintainence interrupt handling */ | |
712 | opal_hmi_handler_init(); | |
713 | ||
47083450 NG |
714 | /* Create i2c platform devices */ |
715 | opal_i2c_create_devs(); | |
716 | ||
3bf57561 BH |
717 | /* Setup a heatbeat thread if requested by OPAL */ |
718 | opal_init_heartbeat(); | |
719 | ||
c159b596 VH |
720 | /* Create leds platform devices */ |
721 | leds = of_find_node_by_path("/ibm,opal/leds"); | |
722 | if (leds) { | |
723 | of_platform_device_create(leds, "opal_leds", NULL); | |
724 | of_node_put(leds); | |
725 | } | |
726 | ||
9b4fffa1 AD |
727 | /* Initialise OPAL message log interface */ |
728 | opal_msglog_init(); | |
729 | ||
6f68b5e2 VH |
730 | /* Create "opal" kobject under /sys/firmware */ |
731 | rc = opal_sysfs_init(); | |
50bd6153 | 732 | if (rc == 0) { |
c8742f85 BH |
733 | /* Export symbol map to userspace */ |
734 | opal_export_symmap(); | |
b09c2ec4 VH |
735 | /* Setup dump region interface */ |
736 | opal_dump_region_init(); | |
774fea1a SS |
737 | /* Setup error log interface */ |
738 | rc = opal_elog_init(); | |
50bd6153 | 739 | /* Setup code update interface */ |
ed59190e | 740 | opal_flash_update_init(); |
c7e64b9c SS |
741 | /* Setup platform dump extract interface */ |
742 | opal_platform_dump_init(); | |
4029cd66 NG |
743 | /* Setup system parameters interface */ |
744 | opal_sys_param_init(); | |
9b4fffa1 AD |
745 | /* Setup message log sysfs interface. */ |
746 | opal_msglog_sysfs_init(); | |
50bd6153 | 747 | } |
6f68b5e2 | 748 | |
0d7cd855 | 749 | /* Initialize platform devices: IPMI backend, PRD & flash interface */ |
48c06154 JK |
750 | opal_pdev_init(opal_node, "ibm,opal-ipmi"); |
751 | opal_pdev_init(opal_node, "ibm,opal-flash"); | |
0d7cd855 | 752 | opal_pdev_init(opal_node, "ibm,opal-prd"); |
ed59190e | 753 | |
affddff6 RC |
754 | /* Initialise OPAL kmsg dumper for flushing console on panic */ |
755 | opal_kmsg_init(); | |
756 | ||
14a43e69 BH |
757 | return 0; |
758 | } | |
b14726c5 | 759 | machine_subsys_initcall(powernv, opal_init); |
73ed148a BH |
760 | |
761 | void opal_shutdown(void) | |
762 | { | |
f7d98d18 | 763 | long rc = OPAL_BUSY; |
73ed148a | 764 | |
9f0fd049 | 765 | opal_event_shutdown(); |
f7d98d18 VH |
766 | |
767 | /* | |
768 | * Then sync with OPAL which ensure anything that can | |
769 | * potentially write to our memory has completed such | |
770 | * as an ongoing dump retrieval | |
771 | */ | |
772 | while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
773 | rc = opal_sync_host_reboot(); | |
774 | if (rc == OPAL_BUSY) | |
775 | opal_poll_events(NULL); | |
776 | else | |
777 | mdelay(10); | |
778 | } | |
b09c2ec4 VH |
779 | |
780 | /* Unregister memory dump region */ | |
b962f5a4 SS |
781 | if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) |
782 | opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); | |
73ed148a | 783 | } |
e28b05e7 JS |
784 | |
785 | /* Export this so that test modules can use it */ | |
786 | EXPORT_SYMBOL_GPL(opal_invalid_call); | |
594fcb9e JK |
787 | EXPORT_SYMBOL_GPL(opal_xscom_read); |
788 | EXPORT_SYMBOL_GPL(opal_xscom_write); | |
608b286d JK |
789 | EXPORT_SYMBOL_GPL(opal_ipmi_send); |
790 | EXPORT_SYMBOL_GPL(opal_ipmi_recv); | |
ed59190e CB |
791 | EXPORT_SYMBOL_GPL(opal_flash_read); |
792 | EXPORT_SYMBOL_GPL(opal_flash_write); | |
793 | EXPORT_SYMBOL_GPL(opal_flash_erase); | |
0d7cd855 | 794 | EXPORT_SYMBOL_GPL(opal_prd_msg); |
3441f04b AB |
795 | |
796 | /* Convert a region of vmalloc memory to an opal sg list */ | |
797 | struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, | |
798 | unsigned long vmalloc_size) | |
799 | { | |
800 | struct opal_sg_list *sg, *first = NULL; | |
801 | unsigned long i = 0; | |
802 | ||
803 | sg = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
804 | if (!sg) | |
805 | goto nomem; | |
806 | ||
807 | first = sg; | |
808 | ||
809 | while (vmalloc_size > 0) { | |
810 | uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; | |
811 | uint64_t length = min(vmalloc_size, PAGE_SIZE); | |
812 | ||
813 | sg->entry[i].data = cpu_to_be64(data); | |
814 | sg->entry[i].length = cpu_to_be64(length); | |
815 | i++; | |
816 | ||
817 | if (i >= SG_ENTRIES_PER_NODE) { | |
818 | struct opal_sg_list *next; | |
819 | ||
820 | next = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
821 | if (!next) | |
822 | goto nomem; | |
823 | ||
824 | sg->length = cpu_to_be64( | |
825 | i * sizeof(struct opal_sg_entry) + 16); | |
826 | i = 0; | |
827 | sg->next = cpu_to_be64(__pa(next)); | |
828 | sg = next; | |
829 | } | |
830 | ||
831 | vmalloc_addr += length; | |
832 | vmalloc_size -= length; | |
833 | } | |
834 | ||
835 | sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); | |
836 | ||
837 | return first; | |
838 | ||
839 | nomem: | |
840 | pr_err("%s : Failed to allocate memory\n", __func__); | |
841 | opal_free_sg_list(first); | |
842 | return NULL; | |
843 | } | |
844 | ||
845 | void opal_free_sg_list(struct opal_sg_list *sg) | |
846 | { | |
847 | while (sg) { | |
848 | uint64_t next = be64_to_cpu(sg->next); | |
849 | ||
850 | kfree(sg); | |
851 | ||
852 | if (next) | |
853 | sg = __va(next); | |
854 | else | |
855 | sg = NULL; | |
856 | } | |
857 | } | |
16b1d26e | 858 | |
e3c5c2e0 CLG |
859 | int opal_error_code(int rc) |
860 | { | |
861 | switch (rc) { | |
862 | case OPAL_SUCCESS: return 0; | |
863 | ||
864 | case OPAL_PARAMETER: return -EINVAL; | |
865 | case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; | |
866 | case OPAL_BUSY_EVENT: return -EBUSY; | |
867 | case OPAL_NO_MEM: return -ENOMEM; | |
14aae78f | 868 | case OPAL_PERMISSION: return -EPERM; |
e3c5c2e0 CLG |
869 | |
870 | case OPAL_UNSUPPORTED: return -EIO; | |
871 | case OPAL_HARDWARE: return -EIO; | |
872 | case OPAL_INTERNAL_ERROR: return -EIO; | |
873 | default: | |
874 | pr_err("%s: unexpected OPAL error %d\n", __func__, rc); | |
875 | return -EIO; | |
876 | } | |
877 | } | |
878 | ||
16b1d26e NG |
879 | EXPORT_SYMBOL_GPL(opal_poll_events); |
880 | EXPORT_SYMBOL_GPL(opal_rtc_read); | |
881 | EXPORT_SYMBOL_GPL(opal_rtc_write); | |
882 | EXPORT_SYMBOL_GPL(opal_tpo_read); | |
883 | EXPORT_SYMBOL_GPL(opal_tpo_write); | |
47083450 | 884 | EXPORT_SYMBOL_GPL(opal_i2c_request); |
c159b596 VH |
885 | /* Export these symbols for PowerNV LED class driver */ |
886 | EXPORT_SYMBOL_GPL(opal_leds_get_ind); | |
887 | EXPORT_SYMBOL_GPL(opal_leds_set_ind); |