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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 BH |
100 | |
101 | powerpc_firmware_features |= FW_FEATURE_OPAL; | |
75b93da4 BH |
102 | if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { |
103 | powerpc_firmware_features |= FW_FEATURE_OPALv2; | |
104 | powerpc_firmware_features |= FW_FEATURE_OPALv3; | |
9a4f5cd0 | 105 | pr_info("OPAL V3 detected !\n"); |
75b93da4 | 106 | } else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) { |
14a43e69 | 107 | powerpc_firmware_features |= FW_FEATURE_OPALv2; |
9a4f5cd0 | 108 | pr_info("OPAL V2 detected !\n"); |
14a43e69 | 109 | } else { |
9a4f5cd0 | 110 | pr_info("OPAL V1 detected !\n"); |
14a43e69 BH |
111 | } |
112 | ||
4926616c BH |
113 | /* Reinit all cores with the right endian */ |
114 | opal_reinit_cores(); | |
115 | ||
116 | /* Restore some bits */ | |
117 | if (cur_cpu_spec->cpu_restore) | |
118 | cur_cpu_spec->cpu_restore(); | |
119 | ||
c4463b37 JK |
120 | return 1; |
121 | } | |
122 | ||
55672ecf MS |
123 | int __init early_init_dt_scan_recoverable_ranges(unsigned long node, |
124 | const char *uname, int depth, void *data) | |
125 | { | |
9d0c4dfe | 126 | int i, psize, size; |
55672ecf MS |
127 | const __be32 *prop; |
128 | ||
129 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
130 | return 0; | |
131 | ||
6e556b47 | 132 | prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); |
55672ecf MS |
133 | |
134 | if (!prop) | |
135 | return 1; | |
136 | ||
137 | pr_debug("Found machine check recoverable ranges.\n"); | |
138 | ||
6e556b47 MS |
139 | /* |
140 | * Calculate number of available entries. | |
141 | * | |
142 | * Each recoverable address range entry is (start address, len, | |
143 | * recovery address), 2 cells each for start and recovery address, | |
144 | * 1 cell for len, totalling 5 cells per entry. | |
145 | */ | |
146 | mc_recoverable_range_len = psize / (sizeof(*prop) * 5); | |
147 | ||
148 | /* Sanity check */ | |
149 | if (!mc_recoverable_range_len) | |
150 | return 1; | |
151 | ||
152 | /* Size required to hold all the entries. */ | |
153 | size = mc_recoverable_range_len * | |
154 | sizeof(struct mcheck_recoverable_range); | |
155 | ||
55672ecf MS |
156 | /* |
157 | * Allocate a buffer to hold the MC recoverable ranges. We would be | |
158 | * accessing them in real mode, hence it needs to be within | |
159 | * RMO region. | |
160 | */ | |
161 | mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), | |
162 | ppc64_rma_size)); | |
163 | memset(mc_recoverable_range, 0, size); | |
164 | ||
6e556b47 | 165 | for (i = 0; i < mc_recoverable_range_len; i++) { |
55672ecf MS |
166 | mc_recoverable_range[i].start_addr = |
167 | of_read_number(prop + (i * 5) + 0, 2); | |
168 | mc_recoverable_range[i].end_addr = | |
169 | mc_recoverable_range[i].start_addr + | |
170 | of_read_number(prop + (i * 5) + 2, 1); | |
171 | mc_recoverable_range[i].recover_addr = | |
172 | of_read_number(prop + (i * 5) + 3, 2); | |
173 | ||
174 | pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", | |
175 | mc_recoverable_range[i].start_addr, | |
176 | mc_recoverable_range[i].end_addr, | |
177 | mc_recoverable_range[i].recover_addr); | |
178 | } | |
55672ecf MS |
179 | return 1; |
180 | } | |
181 | ||
c4463b37 JK |
182 | static int __init opal_register_exception_handlers(void) |
183 | { | |
29186097 | 184 | #ifdef __BIG_ENDIAN__ |
c4463b37 JK |
185 | u64 glue; |
186 | ||
187 | if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) | |
188 | return -ENODEV; | |
189 | ||
28446de2 MS |
190 | /* Hookup some exception handlers except machine check. We use the |
191 | * fwnmi area at 0x7000 to provide the glue space to OPAL | |
ed79ba9e BH |
192 | */ |
193 | glue = 0x7000; | |
6507955c MS |
194 | |
195 | /* | |
196 | * Check if we are running on newer firmware that exports | |
197 | * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch | |
198 | * the HMI interrupt and we catch it directly in Linux. | |
199 | * | |
200 | * For older firmware (i.e currently released POWER8 System Firmware | |
201 | * as of today <= SV810_087), we fallback to old behavior and let OPAL | |
202 | * patch the HMI vector and handle it inside OPAL firmware. | |
203 | * | |
204 | * For newer firmware (in development/yet to be released) we will | |
205 | * start catching/handling HMI directly in Linux. | |
206 | */ | |
207 | if (!opal_check_token(OPAL_HANDLE_HMI)) { | |
08135139 | 208 | pr_info("Old firmware detected, OPAL handles HMIs.\n"); |
6507955c MS |
209 | opal_register_exception_handler( |
210 | OPAL_HYPERVISOR_MAINTENANCE_HANDLER, | |
211 | 0, glue); | |
212 | glue += 128; | |
213 | } | |
214 | ||
ed79ba9e | 215 | opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); |
29186097 | 216 | #endif |
ed79ba9e | 217 | |
c4463b37 | 218 | return 0; |
14a43e69 | 219 | } |
b14726c5 | 220 | machine_early_initcall(powernv, opal_register_exception_handlers); |
c4463b37 | 221 | |
24366360 MS |
222 | /* |
223 | * Opal message notifier based on message type. Allow subscribers to get | |
224 | * notified for specific messgae type. | |
225 | */ | |
d7cf83fc | 226 | int opal_message_notifier_register(enum opal_msg_type msg_type, |
24366360 MS |
227 | struct notifier_block *nb) |
228 | { | |
792f96e9 NG |
229 | if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { |
230 | pr_warning("%s: Invalid arguments, msg_type:%d\n", | |
24366360 MS |
231 | __func__, msg_type); |
232 | return -EINVAL; | |
233 | } | |
792f96e9 | 234 | |
24366360 MS |
235 | return atomic_notifier_chain_register( |
236 | &opal_msg_notifier_head[msg_type], nb); | |
237 | } | |
594fcb9e | 238 | EXPORT_SYMBOL_GPL(opal_message_notifier_register); |
24366360 | 239 | |
df60f576 | 240 | int opal_message_notifier_unregister(enum opal_msg_type msg_type, |
b921e902 NG |
241 | struct notifier_block *nb) |
242 | { | |
243 | return atomic_notifier_chain_unregister( | |
244 | &opal_msg_notifier_head[msg_type], nb); | |
245 | } | |
594fcb9e | 246 | EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); |
b921e902 | 247 | |
24366360 MS |
248 | static void opal_message_do_notify(uint32_t msg_type, void *msg) |
249 | { | |
250 | /* notify subscribers */ | |
251 | atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], | |
252 | msg_type, msg); | |
253 | } | |
254 | ||
255 | static void opal_handle_message(void) | |
256 | { | |
257 | s64 ret; | |
258 | /* | |
259 | * TODO: pre-allocate a message buffer depending on opal-msg-size | |
260 | * value in /proc/device-tree. | |
261 | */ | |
262 | static struct opal_msg msg; | |
bb4398e1 | 263 | u32 type; |
24366360 MS |
264 | |
265 | ret = opal_get_msg(__pa(&msg), sizeof(msg)); | |
266 | /* No opal message pending. */ | |
267 | if (ret == OPAL_RESOURCE) | |
268 | return; | |
269 | ||
270 | /* check for errors. */ | |
271 | if (ret) { | |
1a84db56 | 272 | pr_warning("%s: Failed to retrieve opal message, err=%lld\n", |
24366360 MS |
273 | __func__, ret); |
274 | return; | |
275 | } | |
276 | ||
bb4398e1 AB |
277 | type = be32_to_cpu(msg.msg_type); |
278 | ||
24366360 | 279 | /* Sanity check */ |
792f96e9 | 280 | if (type >= OPAL_MSG_TYPE_MAX) { |
bb4398e1 | 281 | pr_warning("%s: Unknown message type: %u\n", __func__, type); |
24366360 MS |
282 | return; |
283 | } | |
bb4398e1 | 284 | opal_message_do_notify(type, (void *)&msg); |
24366360 MS |
285 | } |
286 | ||
a295af24 | 287 | static irqreturn_t opal_message_notify(int irq, void *data) |
24366360 | 288 | { |
a295af24 AP |
289 | opal_handle_message(); |
290 | return IRQ_HANDLED; | |
24366360 MS |
291 | } |
292 | ||
24366360 MS |
293 | static int __init opal_message_init(void) |
294 | { | |
a295af24 | 295 | int ret, i, irq; |
24366360 MS |
296 | |
297 | for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) | |
298 | ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); | |
299 | ||
a295af24 AP |
300 | irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); |
301 | if (!irq) { | |
302 | pr_err("%s: Can't register OPAL event irq (%d)\n", | |
303 | __func__, irq); | |
304 | return irq; | |
305 | } | |
306 | ||
307 | ret = request_irq(irq, opal_message_notify, | |
308 | IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); | |
24366360 | 309 | if (ret) { |
a295af24 | 310 | pr_err("%s: Can't request OPAL event irq (%d)\n", |
24366360 MS |
311 | __func__, ret); |
312 | return ret; | |
313 | } | |
a295af24 | 314 | |
24366360 MS |
315 | return 0; |
316 | } | |
24366360 | 317 | |
14a43e69 BH |
318 | int opal_get_chars(uint32_t vtermno, char *buf, int count) |
319 | { | |
4f89363b BH |
320 | s64 rc; |
321 | __be64 evt, len; | |
14a43e69 BH |
322 | |
323 | if (!opal.entry) | |
daea1175 | 324 | return -ENODEV; |
14a43e69 | 325 | opal_poll_events(&evt); |
4f89363b | 326 | if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) |
14a43e69 | 327 | return 0; |
4f89363b | 328 | len = cpu_to_be64(count); |
9d0c4dfe | 329 | rc = opal_console_read(vtermno, &len, buf); |
14a43e69 | 330 | if (rc == OPAL_SUCCESS) |
4f89363b | 331 | return be64_to_cpu(len); |
14a43e69 BH |
332 | return 0; |
333 | } | |
334 | ||
335 | int opal_put_chars(uint32_t vtermno, const char *data, int total_len) | |
336 | { | |
337 | int written = 0; | |
4f89363b | 338 | __be64 olen; |
daea1175 | 339 | s64 len, rc; |
14a43e69 | 340 | unsigned long flags; |
4f89363b | 341 | __be64 evt; |
14a43e69 BH |
342 | |
343 | if (!opal.entry) | |
daea1175 | 344 | return -ENODEV; |
14a43e69 BH |
345 | |
346 | /* We want put_chars to be atomic to avoid mangling of hvsi | |
347 | * packets. To do that, we first test for room and return | |
daea1175 BH |
348 | * -EAGAIN if there isn't enough. |
349 | * | |
350 | * Unfortunately, opal_console_write_buffer_space() doesn't | |
351 | * appear to work on opal v1, so we just assume there is | |
352 | * enough room and be done with it | |
14a43e69 BH |
353 | */ |
354 | spin_lock_irqsave(&opal_write_lock, flags); | |
daea1175 | 355 | if (firmware_has_feature(FW_FEATURE_OPALv2)) { |
4f89363b BH |
356 | rc = opal_console_write_buffer_space(vtermno, &olen); |
357 | len = be64_to_cpu(olen); | |
daea1175 BH |
358 | if (rc || len < total_len) { |
359 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
360 | /* Closed -> drop characters */ | |
361 | if (rc) | |
362 | return total_len; | |
4f89363b | 363 | opal_poll_events(NULL); |
daea1175 BH |
364 | return -EAGAIN; |
365 | } | |
14a43e69 BH |
366 | } |
367 | ||
368 | /* We still try to handle partial completions, though they | |
369 | * should no longer happen. | |
370 | */ | |
daea1175 | 371 | rc = OPAL_BUSY; |
14a43e69 BH |
372 | while(total_len > 0 && (rc == OPAL_BUSY || |
373 | rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { | |
4f89363b BH |
374 | olen = cpu_to_be64(total_len); |
375 | rc = opal_console_write(vtermno, &olen, data); | |
376 | len = be64_to_cpu(olen); | |
1de1455f BH |
377 | |
378 | /* Closed or other error drop */ | |
379 | if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && | |
380 | rc != OPAL_BUSY_EVENT) { | |
381 | written = total_len; | |
382 | break; | |
383 | } | |
14a43e69 BH |
384 | if (rc == OPAL_SUCCESS) { |
385 | total_len -= len; | |
386 | data += len; | |
387 | written += len; | |
388 | } | |
389 | /* This is a bit nasty but we need that for the console to | |
390 | * flush when there aren't any interrupts. We will clean | |
391 | * things a bit later to limit that to synchronous path | |
392 | * such as the kernel console and xmon/udbg | |
393 | */ | |
394 | do | |
395 | opal_poll_events(&evt); | |
4f89363b BH |
396 | while(rc == OPAL_SUCCESS && |
397 | (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); | |
14a43e69 BH |
398 | } |
399 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
400 | return written; | |
401 | } | |
402 | ||
b63a0ffe MS |
403 | static int opal_recover_mce(struct pt_regs *regs, |
404 | struct machine_check_event *evt) | |
405 | { | |
406 | int recovered = 0; | |
407 | uint64_t ea = get_mce_fault_addr(evt); | |
408 | ||
409 | if (!(regs->msr & MSR_RI)) { | |
410 | /* If MSR_RI isn't set, we cannot recover */ | |
411 | recovered = 0; | |
412 | } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { | |
413 | /* Platform corrected itself */ | |
414 | recovered = 1; | |
415 | } else if (ea && !is_kernel_addr(ea)) { | |
416 | /* | |
417 | * Faulting address is not in kernel text. We should be fine. | |
418 | * We need to find which process uses this address. | |
419 | * For now, kill the task if we have received exception when | |
420 | * in userspace. | |
421 | * | |
422 | * TODO: Queue up this address for hwpoisioning later. | |
423 | */ | |
424 | if (user_mode(regs) && !is_global_init(current)) { | |
425 | _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); | |
426 | recovered = 1; | |
427 | } else | |
428 | recovered = 0; | |
429 | } else if (user_mode(regs) && !is_global_init(current) && | |
430 | evt->severity == MCE_SEV_ERROR_SYNC) { | |
431 | /* | |
432 | * If we have received a synchronous error when in userspace | |
433 | * kill the task. | |
434 | */ | |
435 | _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); | |
436 | recovered = 1; | |
437 | } | |
438 | return recovered; | |
439 | } | |
440 | ||
ed79ba9e BH |
441 | int opal_machine_check(struct pt_regs *regs) |
442 | { | |
36df96f8 | 443 | struct machine_check_event evt; |
e784b649 | 444 | int ret; |
ed79ba9e | 445 | |
36df96f8 MS |
446 | if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) |
447 | return 0; | |
ed79ba9e BH |
448 | |
449 | /* Print things out */ | |
36df96f8 | 450 | if (evt.version != MCE_V1) { |
ed79ba9e BH |
451 | pr_err("Machine Check Exception, Unknown event version %d !\n", |
452 | evt.version); | |
453 | return 0; | |
454 | } | |
b5ff4211 | 455 | machine_check_print_event_info(&evt); |
ed79ba9e | 456 | |
b63a0ffe MS |
457 | if (opal_recover_mce(regs, &evt)) |
458 | return 1; | |
e784b649 MS |
459 | |
460 | /* | |
461 | * Unrecovered machine check, we are heading to panic path. | |
462 | * | |
463 | * We may have hit this MCE in very early stage of kernel | |
464 | * initialization even before opal-prd has started running. If | |
465 | * this is the case then this MCE error may go un-noticed or | |
466 | * un-analyzed if we go down panic path. We need to inform | |
467 | * BMC/OCC about this error so that they can collect relevant | |
468 | * data for error analysis before rebooting. | |
469 | * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so. | |
470 | * This function may not return on BMC based system. | |
471 | */ | |
472 | ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, | |
473 | "Unrecoverable Machine Check exception"); | |
474 | if (ret == OPAL_UNSUPPORTED) { | |
475 | pr_emerg("Reboot type %d not supported\n", | |
476 | OPAL_REBOOT_PLATFORM_ERROR); | |
477 | } | |
478 | ||
479 | /* | |
480 | * We reached here. There can be three possibilities: | |
481 | * 1. We are running on a firmware level that do not support | |
482 | * opal_cec_reboot2() | |
483 | * 2. We are running on a firmware level that do not support | |
484 | * OPAL_REBOOT_PLATFORM_ERROR reboot type. | |
485 | * 3. We are running on FSP based system that does not need opal | |
486 | * to trigger checkstop explicitly for error analysis. The FSP | |
487 | * PRD component would have already got notified about this | |
488 | * error through other channels. | |
489 | * | |
490 | * In any case, let us just fall through. We anyway heading | |
491 | * down to panic path. | |
492 | */ | |
b63a0ffe | 493 | return 0; |
ed79ba9e BH |
494 | } |
495 | ||
0869b6fd MS |
496 | /* Early hmi handler called in real mode. */ |
497 | int opal_hmi_exception_early(struct pt_regs *regs) | |
498 | { | |
0ef95b41 MS |
499 | s64 rc; |
500 | ||
501 | /* | |
502 | * call opal hmi handler. Pass paca address as token. | |
503 | * The return value OPAL_SUCCESS is an indication that there is | |
504 | * an HMI event generated waiting to pull by Linux. | |
505 | */ | |
506 | rc = opal_handle_hmi(); | |
507 | if (rc == OPAL_SUCCESS) { | |
508 | local_paca->hmi_event_available = 1; | |
509 | return 1; | |
510 | } | |
0869b6fd MS |
511 | return 0; |
512 | } | |
513 | ||
514 | /* HMI exception handler called in virtual mode during check_irq_replay. */ | |
515 | int opal_handle_hmi_exception(struct pt_regs *regs) | |
516 | { | |
0ef95b41 MS |
517 | s64 rc; |
518 | __be64 evt = 0; | |
519 | ||
520 | /* | |
521 | * Check if HMI event is available. | |
522 | * if Yes, then call opal_poll_events to pull opal messages and | |
523 | * process them. | |
524 | */ | |
525 | if (!local_paca->hmi_event_available) | |
526 | return 0; | |
527 | ||
528 | local_paca->hmi_event_available = 0; | |
529 | rc = opal_poll_events(&evt); | |
81f2f7ce | 530 | if (rc == OPAL_SUCCESS && evt) |
9f0fd049 | 531 | opal_handle_events(be64_to_cpu(evt)); |
0ef95b41 MS |
532 | |
533 | return 1; | |
0869b6fd MS |
534 | } |
535 | ||
55672ecf MS |
536 | static uint64_t find_recovery_address(uint64_t nip) |
537 | { | |
538 | int i; | |
539 | ||
540 | for (i = 0; i < mc_recoverable_range_len; i++) | |
541 | if ((nip >= mc_recoverable_range[i].start_addr) && | |
542 | (nip < mc_recoverable_range[i].end_addr)) | |
543 | return mc_recoverable_range[i].recover_addr; | |
544 | return 0; | |
545 | } | |
546 | ||
547 | bool opal_mce_check_early_recovery(struct pt_regs *regs) | |
548 | { | |
549 | uint64_t recover_addr = 0; | |
550 | ||
551 | if (!opal.base || !opal.size) | |
552 | goto out; | |
553 | ||
554 | if ((regs->nip >= opal.base) && | |
555 | (regs->nip <= (opal.base + opal.size))) | |
556 | recover_addr = find_recovery_address(regs->nip); | |
557 | ||
558 | /* | |
559 | * Setup regs->nip to rfi into fixup address. | |
560 | */ | |
561 | if (recover_addr) | |
562 | regs->nip = recover_addr; | |
563 | ||
564 | out: | |
565 | return !!recover_addr; | |
566 | } | |
567 | ||
6f68b5e2 VH |
568 | static int opal_sysfs_init(void) |
569 | { | |
570 | opal_kobj = kobject_create_and_add("opal", firmware_kobj); | |
571 | if (!opal_kobj) { | |
572 | pr_warn("kobject_create_and_add opal failed\n"); | |
573 | return -ENOMEM; | |
574 | } | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
c8742f85 BH |
579 | static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, |
580 | struct bin_attribute *bin_attr, | |
581 | char *buf, loff_t off, size_t count) | |
582 | { | |
583 | return memory_read_from_buffer(buf, count, &off, bin_attr->private, | |
584 | bin_attr->size); | |
585 | } | |
586 | ||
587 | static BIN_ATTR_RO(symbol_map, 0); | |
588 | ||
589 | static void opal_export_symmap(void) | |
590 | { | |
591 | const __be64 *syms; | |
592 | unsigned int size; | |
593 | struct device_node *fw; | |
594 | int rc; | |
595 | ||
596 | fw = of_find_node_by_path("/ibm,opal/firmware"); | |
597 | if (!fw) | |
598 | return; | |
599 | syms = of_get_property(fw, "symbol-map", &size); | |
600 | if (!syms || size != 2 * sizeof(__be64)) | |
601 | return; | |
602 | ||
603 | /* Setup attributes */ | |
604 | bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); | |
605 | bin_attr_symbol_map.size = be64_to_cpu(syms[1]); | |
606 | ||
607 | rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); | |
608 | if (rc) | |
609 | pr_warn("Error %d creating OPAL symbols file\n", rc); | |
610 | } | |
611 | ||
b09c2ec4 VH |
612 | static void __init opal_dump_region_init(void) |
613 | { | |
614 | void *addr; | |
615 | uint64_t size; | |
616 | int rc; | |
617 | ||
b962f5a4 SS |
618 | if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) |
619 | return; | |
620 | ||
b09c2ec4 VH |
621 | /* Register kernel log buffer */ |
622 | addr = log_buf_addr_get(); | |
6501ab5e PK |
623 | if (addr == NULL) |
624 | return; | |
625 | ||
b09c2ec4 | 626 | size = log_buf_len_get(); |
6501ab5e PK |
627 | if (size == 0) |
628 | return; | |
629 | ||
b09c2ec4 VH |
630 | rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, |
631 | __pa(addr), size); | |
632 | /* Don't warn if this is just an older OPAL that doesn't | |
633 | * know about that call | |
634 | */ | |
635 | if (rc && rc != OPAL_UNSUPPORTED) | |
636 | pr_warn("DUMP: Failed to register kernel log buffer. " | |
637 | "rc = %d\n", rc); | |
638 | } | |
608b286d | 639 | |
48c06154 JK |
640 | static void opal_pdev_init(struct device_node *opal_node, |
641 | const char *compatible) | |
ed59190e CB |
642 | { |
643 | struct device_node *np; | |
644 | ||
645 | for_each_child_of_node(opal_node, np) | |
48c06154 | 646 | if (of_device_is_compatible(np, compatible)) |
608b286d JK |
647 | of_platform_device_create(np, NULL, NULL); |
648 | } | |
649 | ||
47083450 NG |
650 | static void opal_i2c_create_devs(void) |
651 | { | |
652 | struct device_node *np; | |
653 | ||
654 | for_each_compatible_node(np, NULL, "ibm,opal-i2c") | |
655 | of_platform_device_create(np, NULL, NULL); | |
656 | } | |
657 | ||
3bf57561 BH |
658 | static int kopald(void *unused) |
659 | { | |
9f0fd049 AP |
660 | __be64 events; |
661 | ||
3bf57561 BH |
662 | set_freezable(); |
663 | do { | |
664 | try_to_freeze(); | |
9f0fd049 AP |
665 | opal_poll_events(&events); |
666 | opal_handle_events(be64_to_cpu(events)); | |
3bf57561 BH |
667 | msleep_interruptible(opal_heartbeat); |
668 | } while (!kthread_should_stop()); | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
673 | static void opal_init_heartbeat(void) | |
674 | { | |
675 | /* Old firwmware, we assume the HVC heartbeat is sufficient */ | |
676 | if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", | |
677 | &opal_heartbeat) != 0) | |
678 | opal_heartbeat = 0; | |
679 | ||
680 | if (opal_heartbeat) | |
681 | kthread_run(kopald, NULL, "kopald"); | |
682 | } | |
683 | ||
14a43e69 BH |
684 | static int __init opal_init(void) |
685 | { | |
686 | struct device_node *np, *consoles; | |
c1c3a526 | 687 | int rc; |
14a43e69 BH |
688 | |
689 | opal_node = of_find_node_by_path("/ibm,opal"); | |
690 | if (!opal_node) { | |
08135139 | 691 | pr_warn("Device node not found\n"); |
14a43e69 BH |
692 | return -ENODEV; |
693 | } | |
2db29d28 BH |
694 | |
695 | /* Register OPAL consoles if any ports */ | |
14a43e69 BH |
696 | if (firmware_has_feature(FW_FEATURE_OPALv2)) |
697 | consoles = of_find_node_by_path("/ibm,opal/consoles"); | |
698 | else | |
699 | consoles = of_node_get(opal_node); | |
2db29d28 BH |
700 | if (consoles) { |
701 | for_each_child_of_node(consoles, np) { | |
702 | if (strcmp(np->name, "serial")) | |
703 | continue; | |
704 | of_platform_device_create(np, NULL, NULL); | |
705 | } | |
706 | of_node_put(consoles); | |
14a43e69 | 707 | } |
a125e092 | 708 | |
96e023e7 AP |
709 | /* Initialise OPAL messaging system */ |
710 | opal_message_init(); | |
711 | ||
712 | /* Initialise OPAL asynchronous completion interface */ | |
713 | opal_async_comp_init(); | |
714 | ||
715 | /* Initialise OPAL sensor interface */ | |
716 | opal_sensor_init(); | |
717 | ||
718 | /* Initialise OPAL hypervisor maintainence interrupt handling */ | |
719 | opal_hmi_handler_init(); | |
720 | ||
47083450 NG |
721 | /* Create i2c platform devices */ |
722 | opal_i2c_create_devs(); | |
723 | ||
3bf57561 BH |
724 | /* Setup a heatbeat thread if requested by OPAL */ |
725 | opal_init_heartbeat(); | |
726 | ||
6f68b5e2 VH |
727 | /* Create "opal" kobject under /sys/firmware */ |
728 | rc = opal_sysfs_init(); | |
50bd6153 | 729 | if (rc == 0) { |
c8742f85 BH |
730 | /* Export symbol map to userspace */ |
731 | opal_export_symmap(); | |
b09c2ec4 VH |
732 | /* Setup dump region interface */ |
733 | opal_dump_region_init(); | |
774fea1a SS |
734 | /* Setup error log interface */ |
735 | rc = opal_elog_init(); | |
50bd6153 | 736 | /* Setup code update interface */ |
ed59190e | 737 | opal_flash_update_init(); |
c7e64b9c SS |
738 | /* Setup platform dump extract interface */ |
739 | opal_platform_dump_init(); | |
4029cd66 NG |
740 | /* Setup system parameters interface */ |
741 | opal_sys_param_init(); | |
bfc36894 JS |
742 | /* Setup message log interface. */ |
743 | opal_msglog_init(); | |
50bd6153 | 744 | } |
6f68b5e2 | 745 | |
0d7cd855 | 746 | /* Initialize platform devices: IPMI backend, PRD & flash interface */ |
48c06154 JK |
747 | opal_pdev_init(opal_node, "ibm,opal-ipmi"); |
748 | opal_pdev_init(opal_node, "ibm,opal-flash"); | |
0d7cd855 | 749 | opal_pdev_init(opal_node, "ibm,opal-prd"); |
ed59190e | 750 | |
14a43e69 BH |
751 | return 0; |
752 | } | |
b14726c5 | 753 | machine_subsys_initcall(powernv, opal_init); |
73ed148a BH |
754 | |
755 | void opal_shutdown(void) | |
756 | { | |
f7d98d18 | 757 | long rc = OPAL_BUSY; |
73ed148a | 758 | |
9f0fd049 | 759 | opal_event_shutdown(); |
f7d98d18 VH |
760 | |
761 | /* | |
762 | * Then sync with OPAL which ensure anything that can | |
763 | * potentially write to our memory has completed such | |
764 | * as an ongoing dump retrieval | |
765 | */ | |
766 | while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
767 | rc = opal_sync_host_reboot(); | |
768 | if (rc == OPAL_BUSY) | |
769 | opal_poll_events(NULL); | |
770 | else | |
771 | mdelay(10); | |
772 | } | |
b09c2ec4 VH |
773 | |
774 | /* Unregister memory dump region */ | |
b962f5a4 SS |
775 | if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) |
776 | opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); | |
73ed148a | 777 | } |
e28b05e7 JS |
778 | |
779 | /* Export this so that test modules can use it */ | |
780 | EXPORT_SYMBOL_GPL(opal_invalid_call); | |
594fcb9e JK |
781 | EXPORT_SYMBOL_GPL(opal_xscom_read); |
782 | EXPORT_SYMBOL_GPL(opal_xscom_write); | |
608b286d JK |
783 | EXPORT_SYMBOL_GPL(opal_ipmi_send); |
784 | EXPORT_SYMBOL_GPL(opal_ipmi_recv); | |
ed59190e CB |
785 | EXPORT_SYMBOL_GPL(opal_flash_read); |
786 | EXPORT_SYMBOL_GPL(opal_flash_write); | |
787 | EXPORT_SYMBOL_GPL(opal_flash_erase); | |
0d7cd855 | 788 | EXPORT_SYMBOL_GPL(opal_prd_msg); |
3441f04b AB |
789 | |
790 | /* Convert a region of vmalloc memory to an opal sg list */ | |
791 | struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, | |
792 | unsigned long vmalloc_size) | |
793 | { | |
794 | struct opal_sg_list *sg, *first = NULL; | |
795 | unsigned long i = 0; | |
796 | ||
797 | sg = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
798 | if (!sg) | |
799 | goto nomem; | |
800 | ||
801 | first = sg; | |
802 | ||
803 | while (vmalloc_size > 0) { | |
804 | uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; | |
805 | uint64_t length = min(vmalloc_size, PAGE_SIZE); | |
806 | ||
807 | sg->entry[i].data = cpu_to_be64(data); | |
808 | sg->entry[i].length = cpu_to_be64(length); | |
809 | i++; | |
810 | ||
811 | if (i >= SG_ENTRIES_PER_NODE) { | |
812 | struct opal_sg_list *next; | |
813 | ||
814 | next = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
815 | if (!next) | |
816 | goto nomem; | |
817 | ||
818 | sg->length = cpu_to_be64( | |
819 | i * sizeof(struct opal_sg_entry) + 16); | |
820 | i = 0; | |
821 | sg->next = cpu_to_be64(__pa(next)); | |
822 | sg = next; | |
823 | } | |
824 | ||
825 | vmalloc_addr += length; | |
826 | vmalloc_size -= length; | |
827 | } | |
828 | ||
829 | sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); | |
830 | ||
831 | return first; | |
832 | ||
833 | nomem: | |
834 | pr_err("%s : Failed to allocate memory\n", __func__); | |
835 | opal_free_sg_list(first); | |
836 | return NULL; | |
837 | } | |
838 | ||
839 | void opal_free_sg_list(struct opal_sg_list *sg) | |
840 | { | |
841 | while (sg) { | |
842 | uint64_t next = be64_to_cpu(sg->next); | |
843 | ||
844 | kfree(sg); | |
845 | ||
846 | if (next) | |
847 | sg = __va(next); | |
848 | else | |
849 | sg = NULL; | |
850 | } | |
851 | } | |
16b1d26e | 852 | |
e3c5c2e0 CLG |
853 | int opal_error_code(int rc) |
854 | { | |
855 | switch (rc) { | |
856 | case OPAL_SUCCESS: return 0; | |
857 | ||
858 | case OPAL_PARAMETER: return -EINVAL; | |
859 | case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; | |
860 | case OPAL_BUSY_EVENT: return -EBUSY; | |
861 | case OPAL_NO_MEM: return -ENOMEM; | |
14aae78f | 862 | case OPAL_PERMISSION: return -EPERM; |
e3c5c2e0 CLG |
863 | |
864 | case OPAL_UNSUPPORTED: return -EIO; | |
865 | case OPAL_HARDWARE: return -EIO; | |
866 | case OPAL_INTERNAL_ERROR: return -EIO; | |
867 | default: | |
868 | pr_err("%s: unexpected OPAL error %d\n", __func__, rc); | |
869 | return -EIO; | |
870 | } | |
871 | } | |
872 | ||
16b1d26e NG |
873 | EXPORT_SYMBOL_GPL(opal_poll_events); |
874 | EXPORT_SYMBOL_GPL(opal_rtc_read); | |
875 | EXPORT_SYMBOL_GPL(opal_rtc_write); | |
876 | EXPORT_SYMBOL_GPL(opal_tpo_read); | |
877 | EXPORT_SYMBOL_GPL(opal_tpo_write); | |
47083450 | 878 | EXPORT_SYMBOL_GPL(opal_i2c_request); |