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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; |
a203658b | 58 | static struct task_struct *kopald_tsk; |
14a43e69 | 59 | |
4926616c BH |
60 | static void opal_reinit_cores(void) |
61 | { | |
62 | /* Do the actual re-init, This will clobber all FPRs, VRs, etc... | |
63 | * | |
64 | * It will preserve non volatile GPRs and HSPRG0/1. It will | |
65 | * also restore HIDs and other SPRs to their original value | |
66 | * but it might clobber a bunch. | |
67 | */ | |
68 | #ifdef __BIG_ENDIAN__ | |
69 | opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); | |
70 | #else | |
71 | opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); | |
72 | #endif | |
73 | } | |
74 | ||
14a43e69 BH |
75 | int __init early_init_dt_scan_opal(unsigned long node, |
76 | const char *uname, int depth, void *data) | |
77 | { | |
55672ecf | 78 | const void *basep, *entryp, *sizep; |
9d0c4dfe | 79 | int basesz, entrysz, runtimesz; |
14a43e69 BH |
80 | |
81 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
82 | return 0; | |
83 | ||
84 | basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); | |
85 | entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); | |
55672ecf | 86 | sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); |
14a43e69 | 87 | |
55672ecf | 88 | if (!basep || !entryp || !sizep) |
14a43e69 BH |
89 | return 1; |
90 | ||
91 | opal.base = of_read_number(basep, basesz/4); | |
92 | opal.entry = of_read_number(entryp, entrysz/4); | |
55672ecf | 93 | opal.size = of_read_number(sizep, runtimesz/4); |
14a43e69 | 94 | |
9d0c4dfe | 95 | pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", |
14a43e69 | 96 | opal.base, basep, basesz); |
9d0c4dfe | 97 | pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", |
14a43e69 | 98 | opal.entry, entryp, entrysz); |
9d0c4dfe | 99 | pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", |
55672ecf | 100 | opal.size, sizep, runtimesz); |
14a43e69 | 101 | |
75b93da4 | 102 | if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { |
e4d54f71 SS |
103 | powerpc_firmware_features |= FW_FEATURE_OPAL; |
104 | pr_info("OPAL detected !\n"); | |
14a43e69 | 105 | } else { |
786842b6 | 106 | panic("OPAL != V3 detected, no longer supported.\n"); |
14a43e69 BH |
107 | } |
108 | ||
4926616c BH |
109 | /* Reinit all cores with the right endian */ |
110 | opal_reinit_cores(); | |
111 | ||
112 | /* Restore some bits */ | |
113 | if (cur_cpu_spec->cpu_restore) | |
114 | cur_cpu_spec->cpu_restore(); | |
115 | ||
c4463b37 JK |
116 | return 1; |
117 | } | |
118 | ||
55672ecf MS |
119 | int __init early_init_dt_scan_recoverable_ranges(unsigned long node, |
120 | const char *uname, int depth, void *data) | |
121 | { | |
9d0c4dfe | 122 | int i, psize, size; |
55672ecf MS |
123 | const __be32 *prop; |
124 | ||
125 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
126 | return 0; | |
127 | ||
6e556b47 | 128 | prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); |
55672ecf MS |
129 | |
130 | if (!prop) | |
131 | return 1; | |
132 | ||
133 | pr_debug("Found machine check recoverable ranges.\n"); | |
134 | ||
6e556b47 MS |
135 | /* |
136 | * Calculate number of available entries. | |
137 | * | |
138 | * Each recoverable address range entry is (start address, len, | |
139 | * recovery address), 2 cells each for start and recovery address, | |
140 | * 1 cell for len, totalling 5 cells per entry. | |
141 | */ | |
142 | mc_recoverable_range_len = psize / (sizeof(*prop) * 5); | |
143 | ||
144 | /* Sanity check */ | |
145 | if (!mc_recoverable_range_len) | |
146 | return 1; | |
147 | ||
148 | /* Size required to hold all the entries. */ | |
149 | size = mc_recoverable_range_len * | |
150 | sizeof(struct mcheck_recoverable_range); | |
151 | ||
55672ecf MS |
152 | /* |
153 | * Allocate a buffer to hold the MC recoverable ranges. We would be | |
154 | * accessing them in real mode, hence it needs to be within | |
155 | * RMO region. | |
156 | */ | |
157 | mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), | |
158 | ppc64_rma_size)); | |
159 | memset(mc_recoverable_range, 0, size); | |
160 | ||
6e556b47 | 161 | for (i = 0; i < mc_recoverable_range_len; i++) { |
55672ecf MS |
162 | mc_recoverable_range[i].start_addr = |
163 | of_read_number(prop + (i * 5) + 0, 2); | |
164 | mc_recoverable_range[i].end_addr = | |
165 | mc_recoverable_range[i].start_addr + | |
166 | of_read_number(prop + (i * 5) + 2, 1); | |
167 | mc_recoverable_range[i].recover_addr = | |
168 | of_read_number(prop + (i * 5) + 3, 2); | |
169 | ||
170 | pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", | |
171 | mc_recoverable_range[i].start_addr, | |
172 | mc_recoverable_range[i].end_addr, | |
173 | mc_recoverable_range[i].recover_addr); | |
174 | } | |
55672ecf MS |
175 | return 1; |
176 | } | |
177 | ||
c4463b37 JK |
178 | static int __init opal_register_exception_handlers(void) |
179 | { | |
29186097 | 180 | #ifdef __BIG_ENDIAN__ |
c4463b37 JK |
181 | u64 glue; |
182 | ||
183 | if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) | |
184 | return -ENODEV; | |
185 | ||
28446de2 MS |
186 | /* Hookup some exception handlers except machine check. We use the |
187 | * fwnmi area at 0x7000 to provide the glue space to OPAL | |
ed79ba9e BH |
188 | */ |
189 | glue = 0x7000; | |
6507955c MS |
190 | |
191 | /* | |
192 | * Check if we are running on newer firmware that exports | |
193 | * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch | |
194 | * the HMI interrupt and we catch it directly in Linux. | |
195 | * | |
196 | * For older firmware (i.e currently released POWER8 System Firmware | |
197 | * as of today <= SV810_087), we fallback to old behavior and let OPAL | |
198 | * patch the HMI vector and handle it inside OPAL firmware. | |
199 | * | |
200 | * For newer firmware (in development/yet to be released) we will | |
201 | * start catching/handling HMI directly in Linux. | |
202 | */ | |
203 | if (!opal_check_token(OPAL_HANDLE_HMI)) { | |
08135139 | 204 | pr_info("Old firmware detected, OPAL handles HMIs.\n"); |
6507955c MS |
205 | opal_register_exception_handler( |
206 | OPAL_HYPERVISOR_MAINTENANCE_HANDLER, | |
207 | 0, glue); | |
208 | glue += 128; | |
209 | } | |
210 | ||
ed79ba9e | 211 | opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); |
29186097 | 212 | #endif |
ed79ba9e | 213 | |
c4463b37 | 214 | return 0; |
14a43e69 | 215 | } |
b14726c5 | 216 | machine_early_initcall(powernv, opal_register_exception_handlers); |
c4463b37 | 217 | |
24366360 MS |
218 | /* |
219 | * Opal message notifier based on message type. Allow subscribers to get | |
220 | * notified for specific messgae type. | |
221 | */ | |
d7cf83fc | 222 | int opal_message_notifier_register(enum opal_msg_type msg_type, |
24366360 MS |
223 | struct notifier_block *nb) |
224 | { | |
792f96e9 NG |
225 | if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { |
226 | pr_warning("%s: Invalid arguments, msg_type:%d\n", | |
24366360 MS |
227 | __func__, msg_type); |
228 | return -EINVAL; | |
229 | } | |
792f96e9 | 230 | |
24366360 MS |
231 | return atomic_notifier_chain_register( |
232 | &opal_msg_notifier_head[msg_type], nb); | |
233 | } | |
594fcb9e | 234 | EXPORT_SYMBOL_GPL(opal_message_notifier_register); |
24366360 | 235 | |
df60f576 | 236 | int opal_message_notifier_unregister(enum opal_msg_type msg_type, |
b921e902 NG |
237 | struct notifier_block *nb) |
238 | { | |
239 | return atomic_notifier_chain_unregister( | |
240 | &opal_msg_notifier_head[msg_type], nb); | |
241 | } | |
594fcb9e | 242 | EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); |
b921e902 | 243 | |
24366360 MS |
244 | static void opal_message_do_notify(uint32_t msg_type, void *msg) |
245 | { | |
246 | /* notify subscribers */ | |
247 | atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], | |
248 | msg_type, msg); | |
249 | } | |
250 | ||
251 | static void opal_handle_message(void) | |
252 | { | |
253 | s64 ret; | |
254 | /* | |
255 | * TODO: pre-allocate a message buffer depending on opal-msg-size | |
256 | * value in /proc/device-tree. | |
257 | */ | |
258 | static struct opal_msg msg; | |
bb4398e1 | 259 | u32 type; |
24366360 MS |
260 | |
261 | ret = opal_get_msg(__pa(&msg), sizeof(msg)); | |
262 | /* No opal message pending. */ | |
263 | if (ret == OPAL_RESOURCE) | |
264 | return; | |
265 | ||
266 | /* check for errors. */ | |
267 | if (ret) { | |
1a84db56 | 268 | pr_warning("%s: Failed to retrieve opal message, err=%lld\n", |
24366360 MS |
269 | __func__, ret); |
270 | return; | |
271 | } | |
272 | ||
bb4398e1 AB |
273 | type = be32_to_cpu(msg.msg_type); |
274 | ||
24366360 | 275 | /* Sanity check */ |
792f96e9 | 276 | if (type >= OPAL_MSG_TYPE_MAX) { |
98da62b7 | 277 | pr_warn_once("%s: Unknown message type: %u\n", __func__, type); |
24366360 MS |
278 | return; |
279 | } | |
bb4398e1 | 280 | opal_message_do_notify(type, (void *)&msg); |
24366360 MS |
281 | } |
282 | ||
a295af24 | 283 | static irqreturn_t opal_message_notify(int irq, void *data) |
24366360 | 284 | { |
a295af24 AP |
285 | opal_handle_message(); |
286 | return IRQ_HANDLED; | |
24366360 MS |
287 | } |
288 | ||
24366360 MS |
289 | static int __init opal_message_init(void) |
290 | { | |
a295af24 | 291 | int ret, i, irq; |
24366360 MS |
292 | |
293 | for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) | |
294 | ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); | |
295 | ||
a295af24 AP |
296 | irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); |
297 | if (!irq) { | |
298 | pr_err("%s: Can't register OPAL event irq (%d)\n", | |
299 | __func__, irq); | |
300 | return irq; | |
301 | } | |
302 | ||
303 | ret = request_irq(irq, opal_message_notify, | |
304 | IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); | |
24366360 | 305 | if (ret) { |
a295af24 | 306 | pr_err("%s: Can't request OPAL event irq (%d)\n", |
24366360 MS |
307 | __func__, ret); |
308 | return ret; | |
309 | } | |
a295af24 | 310 | |
24366360 MS |
311 | return 0; |
312 | } | |
24366360 | 313 | |
14a43e69 BH |
314 | int opal_get_chars(uint32_t vtermno, char *buf, int count) |
315 | { | |
4f89363b BH |
316 | s64 rc; |
317 | __be64 evt, len; | |
14a43e69 BH |
318 | |
319 | if (!opal.entry) | |
daea1175 | 320 | return -ENODEV; |
14a43e69 | 321 | opal_poll_events(&evt); |
4f89363b | 322 | if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) |
14a43e69 | 323 | return 0; |
4f89363b | 324 | len = cpu_to_be64(count); |
9d0c4dfe | 325 | rc = opal_console_read(vtermno, &len, buf); |
14a43e69 | 326 | if (rc == OPAL_SUCCESS) |
4f89363b | 327 | return be64_to_cpu(len); |
14a43e69 BH |
328 | return 0; |
329 | } | |
330 | ||
331 | int opal_put_chars(uint32_t vtermno, const char *data, int total_len) | |
332 | { | |
333 | int written = 0; | |
4f89363b | 334 | __be64 olen; |
daea1175 | 335 | s64 len, rc; |
14a43e69 | 336 | unsigned long flags; |
4f89363b | 337 | __be64 evt; |
14a43e69 BH |
338 | |
339 | if (!opal.entry) | |
daea1175 | 340 | return -ENODEV; |
14a43e69 BH |
341 | |
342 | /* We want put_chars to be atomic to avoid mangling of hvsi | |
343 | * packets. To do that, we first test for room and return | |
daea1175 BH |
344 | * -EAGAIN if there isn't enough. |
345 | * | |
346 | * Unfortunately, opal_console_write_buffer_space() doesn't | |
347 | * appear to work on opal v1, so we just assume there is | |
348 | * enough room and be done with it | |
14a43e69 BH |
349 | */ |
350 | spin_lock_irqsave(&opal_write_lock, flags); | |
e4d54f71 SS |
351 | rc = opal_console_write_buffer_space(vtermno, &olen); |
352 | len = be64_to_cpu(olen); | |
353 | if (rc || len < total_len) { | |
354 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
355 | /* Closed -> drop characters */ | |
356 | if (rc) | |
357 | return total_len; | |
358 | opal_poll_events(NULL); | |
359 | return -EAGAIN; | |
14a43e69 BH |
360 | } |
361 | ||
362 | /* We still try to handle partial completions, though they | |
363 | * should no longer happen. | |
364 | */ | |
daea1175 | 365 | rc = OPAL_BUSY; |
14a43e69 BH |
366 | while(total_len > 0 && (rc == OPAL_BUSY || |
367 | rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { | |
4f89363b BH |
368 | olen = cpu_to_be64(total_len); |
369 | rc = opal_console_write(vtermno, &olen, data); | |
370 | len = be64_to_cpu(olen); | |
1de1455f BH |
371 | |
372 | /* Closed or other error drop */ | |
373 | if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && | |
374 | rc != OPAL_BUSY_EVENT) { | |
375 | written = total_len; | |
376 | break; | |
377 | } | |
14a43e69 BH |
378 | if (rc == OPAL_SUCCESS) { |
379 | total_len -= len; | |
380 | data += len; | |
381 | written += len; | |
382 | } | |
383 | /* This is a bit nasty but we need that for the console to | |
384 | * flush when there aren't any interrupts. We will clean | |
385 | * things a bit later to limit that to synchronous path | |
386 | * such as the kernel console and xmon/udbg | |
387 | */ | |
388 | do | |
389 | opal_poll_events(&evt); | |
4f89363b BH |
390 | while(rc == OPAL_SUCCESS && |
391 | (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); | |
14a43e69 BH |
392 | } |
393 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
394 | return written; | |
395 | } | |
396 | ||
b63a0ffe MS |
397 | static int opal_recover_mce(struct pt_regs *regs, |
398 | struct machine_check_event *evt) | |
399 | { | |
400 | int recovered = 0; | |
401 | uint64_t ea = get_mce_fault_addr(evt); | |
402 | ||
403 | if (!(regs->msr & MSR_RI)) { | |
404 | /* If MSR_RI isn't set, we cannot recover */ | |
405 | recovered = 0; | |
406 | } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { | |
407 | /* Platform corrected itself */ | |
408 | recovered = 1; | |
409 | } else if (ea && !is_kernel_addr(ea)) { | |
410 | /* | |
411 | * Faulting address is not in kernel text. We should be fine. | |
412 | * We need to find which process uses this address. | |
413 | * For now, kill the task if we have received exception when | |
414 | * in userspace. | |
415 | * | |
416 | * TODO: Queue up this address for hwpoisioning later. | |
417 | */ | |
418 | if (user_mode(regs) && !is_global_init(current)) { | |
419 | _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); | |
420 | recovered = 1; | |
421 | } else | |
422 | recovered = 0; | |
423 | } else if (user_mode(regs) && !is_global_init(current) && | |
424 | evt->severity == MCE_SEV_ERROR_SYNC) { | |
425 | /* | |
426 | * If we have received a synchronous error when in userspace | |
427 | * kill the task. | |
428 | */ | |
429 | _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); | |
430 | recovered = 1; | |
431 | } | |
432 | return recovered; | |
433 | } | |
434 | ||
ed79ba9e BH |
435 | int opal_machine_check(struct pt_regs *regs) |
436 | { | |
36df96f8 | 437 | struct machine_check_event evt; |
e784b649 | 438 | int ret; |
ed79ba9e | 439 | |
36df96f8 MS |
440 | if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) |
441 | return 0; | |
ed79ba9e BH |
442 | |
443 | /* Print things out */ | |
36df96f8 | 444 | if (evt.version != MCE_V1) { |
ed79ba9e BH |
445 | pr_err("Machine Check Exception, Unknown event version %d !\n", |
446 | evt.version); | |
447 | return 0; | |
448 | } | |
b5ff4211 | 449 | machine_check_print_event_info(&evt); |
ed79ba9e | 450 | |
b63a0ffe MS |
451 | if (opal_recover_mce(regs, &evt)) |
452 | return 1; | |
e784b649 MS |
453 | |
454 | /* | |
455 | * Unrecovered machine check, we are heading to panic path. | |
456 | * | |
457 | * We may have hit this MCE in very early stage of kernel | |
458 | * initialization even before opal-prd has started running. If | |
459 | * this is the case then this MCE error may go un-noticed or | |
460 | * un-analyzed if we go down panic path. We need to inform | |
461 | * BMC/OCC about this error so that they can collect relevant | |
462 | * data for error analysis before rebooting. | |
463 | * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so. | |
464 | * This function may not return on BMC based system. | |
465 | */ | |
466 | ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, | |
467 | "Unrecoverable Machine Check exception"); | |
468 | if (ret == OPAL_UNSUPPORTED) { | |
469 | pr_emerg("Reboot type %d not supported\n", | |
470 | OPAL_REBOOT_PLATFORM_ERROR); | |
471 | } | |
472 | ||
473 | /* | |
474 | * We reached here. There can be three possibilities: | |
475 | * 1. We are running on a firmware level that do not support | |
476 | * opal_cec_reboot2() | |
477 | * 2. We are running on a firmware level that do not support | |
478 | * OPAL_REBOOT_PLATFORM_ERROR reboot type. | |
479 | * 3. We are running on FSP based system that does not need opal | |
480 | * to trigger checkstop explicitly for error analysis. The FSP | |
481 | * PRD component would have already got notified about this | |
482 | * error through other channels. | |
483 | * | |
f2dd80ec DA |
484 | * If hardware marked this as an unrecoverable MCE, we are |
485 | * going to panic anyway. Even if it didn't, it's not safe to | |
486 | * continue at this point, so we should explicitly panic. | |
e784b649 | 487 | */ |
f2dd80ec DA |
488 | |
489 | panic("PowerNV Unrecovered Machine Check"); | |
b63a0ffe | 490 | return 0; |
ed79ba9e BH |
491 | } |
492 | ||
0869b6fd MS |
493 | /* Early hmi handler called in real mode. */ |
494 | int opal_hmi_exception_early(struct pt_regs *regs) | |
495 | { | |
0ef95b41 MS |
496 | s64 rc; |
497 | ||
498 | /* | |
499 | * call opal hmi handler. Pass paca address as token. | |
500 | * The return value OPAL_SUCCESS is an indication that there is | |
501 | * an HMI event generated waiting to pull by Linux. | |
502 | */ | |
503 | rc = opal_handle_hmi(); | |
504 | if (rc == OPAL_SUCCESS) { | |
505 | local_paca->hmi_event_available = 1; | |
506 | return 1; | |
507 | } | |
0869b6fd MS |
508 | return 0; |
509 | } | |
510 | ||
511 | /* HMI exception handler called in virtual mode during check_irq_replay. */ | |
512 | int opal_handle_hmi_exception(struct pt_regs *regs) | |
513 | { | |
0ef95b41 MS |
514 | s64 rc; |
515 | __be64 evt = 0; | |
516 | ||
517 | /* | |
518 | * Check if HMI event is available. | |
519 | * if Yes, then call opal_poll_events to pull opal messages and | |
520 | * process them. | |
521 | */ | |
522 | if (!local_paca->hmi_event_available) | |
523 | return 0; | |
524 | ||
525 | local_paca->hmi_event_available = 0; | |
526 | rc = opal_poll_events(&evt); | |
81f2f7ce | 527 | if (rc == OPAL_SUCCESS && evt) |
9f0fd049 | 528 | opal_handle_events(be64_to_cpu(evt)); |
0ef95b41 MS |
529 | |
530 | return 1; | |
0869b6fd MS |
531 | } |
532 | ||
55672ecf MS |
533 | static uint64_t find_recovery_address(uint64_t nip) |
534 | { | |
535 | int i; | |
536 | ||
537 | for (i = 0; i < mc_recoverable_range_len; i++) | |
538 | if ((nip >= mc_recoverable_range[i].start_addr) && | |
539 | (nip < mc_recoverable_range[i].end_addr)) | |
540 | return mc_recoverable_range[i].recover_addr; | |
541 | return 0; | |
542 | } | |
543 | ||
544 | bool opal_mce_check_early_recovery(struct pt_regs *regs) | |
545 | { | |
546 | uint64_t recover_addr = 0; | |
547 | ||
548 | if (!opal.base || !opal.size) | |
549 | goto out; | |
550 | ||
551 | if ((regs->nip >= opal.base) && | |
dc3799bb | 552 | (regs->nip < (opal.base + opal.size))) |
55672ecf MS |
553 | recover_addr = find_recovery_address(regs->nip); |
554 | ||
555 | /* | |
556 | * Setup regs->nip to rfi into fixup address. | |
557 | */ | |
558 | if (recover_addr) | |
559 | regs->nip = recover_addr; | |
560 | ||
561 | out: | |
562 | return !!recover_addr; | |
563 | } | |
564 | ||
6f68b5e2 VH |
565 | static int opal_sysfs_init(void) |
566 | { | |
567 | opal_kobj = kobject_create_and_add("opal", firmware_kobj); | |
568 | if (!opal_kobj) { | |
569 | pr_warn("kobject_create_and_add opal failed\n"); | |
570 | return -ENOMEM; | |
571 | } | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
c8742f85 BH |
576 | static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, |
577 | struct bin_attribute *bin_attr, | |
578 | char *buf, loff_t off, size_t count) | |
579 | { | |
580 | return memory_read_from_buffer(buf, count, &off, bin_attr->private, | |
581 | bin_attr->size); | |
582 | } | |
583 | ||
584 | static BIN_ATTR_RO(symbol_map, 0); | |
585 | ||
586 | static void opal_export_symmap(void) | |
587 | { | |
588 | const __be64 *syms; | |
589 | unsigned int size; | |
590 | struct device_node *fw; | |
591 | int rc; | |
592 | ||
593 | fw = of_find_node_by_path("/ibm,opal/firmware"); | |
594 | if (!fw) | |
595 | return; | |
596 | syms = of_get_property(fw, "symbol-map", &size); | |
597 | if (!syms || size != 2 * sizeof(__be64)) | |
598 | return; | |
599 | ||
600 | /* Setup attributes */ | |
601 | bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); | |
602 | bin_attr_symbol_map.size = be64_to_cpu(syms[1]); | |
603 | ||
604 | rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); | |
605 | if (rc) | |
606 | pr_warn("Error %d creating OPAL symbols file\n", rc); | |
607 | } | |
608 | ||
b09c2ec4 VH |
609 | static void __init opal_dump_region_init(void) |
610 | { | |
611 | void *addr; | |
612 | uint64_t size; | |
613 | int rc; | |
614 | ||
b962f5a4 SS |
615 | if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) |
616 | return; | |
617 | ||
b09c2ec4 VH |
618 | /* Register kernel log buffer */ |
619 | addr = log_buf_addr_get(); | |
6501ab5e PK |
620 | if (addr == NULL) |
621 | return; | |
622 | ||
b09c2ec4 | 623 | size = log_buf_len_get(); |
6501ab5e PK |
624 | if (size == 0) |
625 | return; | |
626 | ||
b09c2ec4 VH |
627 | rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, |
628 | __pa(addr), size); | |
629 | /* Don't warn if this is just an older OPAL that doesn't | |
630 | * know about that call | |
631 | */ | |
632 | if (rc && rc != OPAL_UNSUPPORTED) | |
633 | pr_warn("DUMP: Failed to register kernel log buffer. " | |
634 | "rc = %d\n", rc); | |
635 | } | |
608b286d | 636 | |
48c06154 JK |
637 | static void opal_pdev_init(struct device_node *opal_node, |
638 | const char *compatible) | |
ed59190e CB |
639 | { |
640 | struct device_node *np; | |
641 | ||
642 | for_each_child_of_node(opal_node, np) | |
48c06154 | 643 | if (of_device_is_compatible(np, compatible)) |
608b286d JK |
644 | of_platform_device_create(np, NULL, NULL); |
645 | } | |
646 | ||
47083450 NG |
647 | static void opal_i2c_create_devs(void) |
648 | { | |
649 | struct device_node *np; | |
650 | ||
651 | for_each_compatible_node(np, NULL, "ibm,opal-i2c") | |
652 | of_platform_device_create(np, NULL, NULL); | |
653 | } | |
654 | ||
3bf57561 BH |
655 | static int kopald(void *unused) |
656 | { | |
a203658b | 657 | unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; |
9f0fd049 AP |
658 | __be64 events; |
659 | ||
3bf57561 BH |
660 | set_freezable(); |
661 | do { | |
662 | try_to_freeze(); | |
9f0fd049 AP |
663 | opal_poll_events(&events); |
664 | opal_handle_events(be64_to_cpu(events)); | |
a203658b | 665 | schedule_timeout_interruptible(timeout); |
3bf57561 BH |
666 | } while (!kthread_should_stop()); |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
a203658b BH |
671 | void opal_wake_poller(void) |
672 | { | |
673 | if (kopald_tsk) | |
674 | wake_up_process(kopald_tsk); | |
675 | } | |
676 | ||
3bf57561 BH |
677 | static void opal_init_heartbeat(void) |
678 | { | |
679 | /* Old firwmware, we assume the HVC heartbeat is sufficient */ | |
680 | if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", | |
681 | &opal_heartbeat) != 0) | |
682 | opal_heartbeat = 0; | |
683 | ||
684 | if (opal_heartbeat) | |
a203658b | 685 | kopald_tsk = kthread_run(kopald, NULL, "kopald"); |
3bf57561 BH |
686 | } |
687 | ||
14a43e69 BH |
688 | static int __init opal_init(void) |
689 | { | |
c159b596 | 690 | struct device_node *np, *consoles, *leds; |
c1c3a526 | 691 | int rc; |
14a43e69 BH |
692 | |
693 | opal_node = of_find_node_by_path("/ibm,opal"); | |
694 | if (!opal_node) { | |
08135139 | 695 | pr_warn("Device node not found\n"); |
14a43e69 BH |
696 | return -ENODEV; |
697 | } | |
2db29d28 BH |
698 | |
699 | /* Register OPAL consoles if any ports */ | |
7261aafc | 700 | consoles = of_find_node_by_path("/ibm,opal/consoles"); |
2db29d28 BH |
701 | if (consoles) { |
702 | for_each_child_of_node(consoles, np) { | |
703 | if (strcmp(np->name, "serial")) | |
704 | continue; | |
705 | of_platform_device_create(np, NULL, NULL); | |
706 | } | |
707 | of_node_put(consoles); | |
14a43e69 | 708 | } |
a125e092 | 709 | |
96e023e7 AP |
710 | /* Initialise OPAL messaging system */ |
711 | opal_message_init(); | |
712 | ||
713 | /* Initialise OPAL asynchronous completion interface */ | |
714 | opal_async_comp_init(); | |
715 | ||
716 | /* Initialise OPAL sensor interface */ | |
717 | opal_sensor_init(); | |
718 | ||
719 | /* Initialise OPAL hypervisor maintainence interrupt handling */ | |
720 | opal_hmi_handler_init(); | |
721 | ||
47083450 NG |
722 | /* Create i2c platform devices */ |
723 | opal_i2c_create_devs(); | |
724 | ||
3bf57561 BH |
725 | /* Setup a heatbeat thread if requested by OPAL */ |
726 | opal_init_heartbeat(); | |
727 | ||
c159b596 VH |
728 | /* Create leds platform devices */ |
729 | leds = of_find_node_by_path("/ibm,opal/leds"); | |
730 | if (leds) { | |
731 | of_platform_device_create(leds, "opal_leds", NULL); | |
732 | of_node_put(leds); | |
733 | } | |
734 | ||
9b4fffa1 AD |
735 | /* Initialise OPAL message log interface */ |
736 | opal_msglog_init(); | |
737 | ||
6f68b5e2 VH |
738 | /* Create "opal" kobject under /sys/firmware */ |
739 | rc = opal_sysfs_init(); | |
50bd6153 | 740 | if (rc == 0) { |
c8742f85 BH |
741 | /* Export symbol map to userspace */ |
742 | opal_export_symmap(); | |
b09c2ec4 VH |
743 | /* Setup dump region interface */ |
744 | opal_dump_region_init(); | |
774fea1a SS |
745 | /* Setup error log interface */ |
746 | rc = opal_elog_init(); | |
50bd6153 | 747 | /* Setup code update interface */ |
ed59190e | 748 | opal_flash_update_init(); |
c7e64b9c SS |
749 | /* Setup platform dump extract interface */ |
750 | opal_platform_dump_init(); | |
4029cd66 NG |
751 | /* Setup system parameters interface */ |
752 | opal_sys_param_init(); | |
9b4fffa1 AD |
753 | /* Setup message log sysfs interface. */ |
754 | opal_msglog_sysfs_init(); | |
50bd6153 | 755 | } |
6f68b5e2 | 756 | |
0d7cd855 | 757 | /* Initialize platform devices: IPMI backend, PRD & flash interface */ |
48c06154 JK |
758 | opal_pdev_init(opal_node, "ibm,opal-ipmi"); |
759 | opal_pdev_init(opal_node, "ibm,opal-flash"); | |
0d7cd855 | 760 | opal_pdev_init(opal_node, "ibm,opal-prd"); |
ed59190e | 761 | |
43a1dd9b SJS |
762 | /* Initialise platform device: oppanel interface */ |
763 | opal_pdev_init(opal_node, "ibm,opal-oppanel"); | |
764 | ||
affddff6 RC |
765 | /* Initialise OPAL kmsg dumper for flushing console on panic */ |
766 | opal_kmsg_init(); | |
767 | ||
14a43e69 BH |
768 | return 0; |
769 | } | |
b14726c5 | 770 | machine_subsys_initcall(powernv, opal_init); |
73ed148a BH |
771 | |
772 | void opal_shutdown(void) | |
773 | { | |
f7d98d18 | 774 | long rc = OPAL_BUSY; |
73ed148a | 775 | |
9f0fd049 | 776 | opal_event_shutdown(); |
f7d98d18 VH |
777 | |
778 | /* | |
779 | * Then sync with OPAL which ensure anything that can | |
780 | * potentially write to our memory has completed such | |
781 | * as an ongoing dump retrieval | |
782 | */ | |
783 | while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
784 | rc = opal_sync_host_reboot(); | |
785 | if (rc == OPAL_BUSY) | |
786 | opal_poll_events(NULL); | |
787 | else | |
788 | mdelay(10); | |
789 | } | |
b09c2ec4 VH |
790 | |
791 | /* Unregister memory dump region */ | |
b962f5a4 SS |
792 | if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) |
793 | opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); | |
73ed148a | 794 | } |
e28b05e7 JS |
795 | |
796 | /* Export this so that test modules can use it */ | |
797 | EXPORT_SYMBOL_GPL(opal_invalid_call); | |
594fcb9e JK |
798 | EXPORT_SYMBOL_GPL(opal_xscom_read); |
799 | EXPORT_SYMBOL_GPL(opal_xscom_write); | |
608b286d JK |
800 | EXPORT_SYMBOL_GPL(opal_ipmi_send); |
801 | EXPORT_SYMBOL_GPL(opal_ipmi_recv); | |
ed59190e CB |
802 | EXPORT_SYMBOL_GPL(opal_flash_read); |
803 | EXPORT_SYMBOL_GPL(opal_flash_write); | |
804 | EXPORT_SYMBOL_GPL(opal_flash_erase); | |
0d7cd855 | 805 | EXPORT_SYMBOL_GPL(opal_prd_msg); |
3441f04b AB |
806 | |
807 | /* Convert a region of vmalloc memory to an opal sg list */ | |
808 | struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, | |
809 | unsigned long vmalloc_size) | |
810 | { | |
811 | struct opal_sg_list *sg, *first = NULL; | |
812 | unsigned long i = 0; | |
813 | ||
814 | sg = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
815 | if (!sg) | |
816 | goto nomem; | |
817 | ||
818 | first = sg; | |
819 | ||
820 | while (vmalloc_size > 0) { | |
821 | uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; | |
822 | uint64_t length = min(vmalloc_size, PAGE_SIZE); | |
823 | ||
824 | sg->entry[i].data = cpu_to_be64(data); | |
825 | sg->entry[i].length = cpu_to_be64(length); | |
826 | i++; | |
827 | ||
828 | if (i >= SG_ENTRIES_PER_NODE) { | |
829 | struct opal_sg_list *next; | |
830 | ||
831 | next = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
832 | if (!next) | |
833 | goto nomem; | |
834 | ||
835 | sg->length = cpu_to_be64( | |
836 | i * sizeof(struct opal_sg_entry) + 16); | |
837 | i = 0; | |
838 | sg->next = cpu_to_be64(__pa(next)); | |
839 | sg = next; | |
840 | } | |
841 | ||
842 | vmalloc_addr += length; | |
843 | vmalloc_size -= length; | |
844 | } | |
845 | ||
846 | sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); | |
847 | ||
848 | return first; | |
849 | ||
850 | nomem: | |
851 | pr_err("%s : Failed to allocate memory\n", __func__); | |
852 | opal_free_sg_list(first); | |
853 | return NULL; | |
854 | } | |
855 | ||
856 | void opal_free_sg_list(struct opal_sg_list *sg) | |
857 | { | |
858 | while (sg) { | |
859 | uint64_t next = be64_to_cpu(sg->next); | |
860 | ||
861 | kfree(sg); | |
862 | ||
863 | if (next) | |
864 | sg = __va(next); | |
865 | else | |
866 | sg = NULL; | |
867 | } | |
868 | } | |
16b1d26e | 869 | |
e3c5c2e0 CLG |
870 | int opal_error_code(int rc) |
871 | { | |
872 | switch (rc) { | |
873 | case OPAL_SUCCESS: return 0; | |
874 | ||
875 | case OPAL_PARAMETER: return -EINVAL; | |
876 | case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; | |
877 | case OPAL_BUSY_EVENT: return -EBUSY; | |
878 | case OPAL_NO_MEM: return -ENOMEM; | |
14aae78f | 879 | case OPAL_PERMISSION: return -EPERM; |
e3c5c2e0 CLG |
880 | |
881 | case OPAL_UNSUPPORTED: return -EIO; | |
882 | case OPAL_HARDWARE: return -EIO; | |
883 | case OPAL_INTERNAL_ERROR: return -EIO; | |
884 | default: | |
885 | pr_err("%s: unexpected OPAL error %d\n", __func__, rc); | |
886 | return -EIO; | |
887 | } | |
888 | } | |
889 | ||
16b1d26e NG |
890 | EXPORT_SYMBOL_GPL(opal_poll_events); |
891 | EXPORT_SYMBOL_GPL(opal_rtc_read); | |
892 | EXPORT_SYMBOL_GPL(opal_rtc_write); | |
893 | EXPORT_SYMBOL_GPL(opal_tpo_read); | |
894 | EXPORT_SYMBOL_GPL(opal_tpo_write); | |
47083450 | 895 | EXPORT_SYMBOL_GPL(opal_i2c_request); |
c159b596 VH |
896 | /* Export these symbols for PowerNV LED class driver */ |
897 | EXPORT_SYMBOL_GPL(opal_leds_get_ind); | |
898 | EXPORT_SYMBOL_GPL(opal_leds_set_ind); | |
43a1dd9b SJS |
899 | /* Export this symbol for PowerNV Operator Panel class driver */ |
900 | EXPORT_SYMBOL_GPL(opal_write_oppanel_async); |