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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> |
8f95faaa | 19 | #include <linux/of_address.h> |
a125e092 | 20 | #include <linux/interrupt.h> |
1bc98de2 | 21 | #include <linux/notifier.h> |
73ed148a | 22 | #include <linux/slab.h> |
b63a0ffe | 23 | #include <linux/sched.h> |
6f68b5e2 | 24 | #include <linux/kobject.h> |
f7d98d18 | 25 | #include <linux/delay.h> |
55672ecf | 26 | #include <linux/memblock.h> |
3bf57561 BH |
27 | #include <linux/kthread.h> |
28 | #include <linux/freezer.h> | |
b14726c5 ME |
29 | |
30 | #include <asm/machdep.h> | |
14a43e69 BH |
31 | #include <asm/opal.h> |
32 | #include <asm/firmware.h> | |
36df96f8 | 33 | #include <asm/mce.h> |
8f95faaa | 34 | #include <asm/imc-pmu.h> |
14a43e69 BH |
35 | |
36 | #include "powernv.h" | |
37 | ||
6f68b5e2 VH |
38 | /* /sys/firmware/opal */ |
39 | struct kobject *opal_kobj; | |
40 | ||
14a43e69 BH |
41 | struct opal { |
42 | u64 base; | |
43 | u64 entry; | |
55672ecf | 44 | u64 size; |
14a43e69 BH |
45 | } opal; |
46 | ||
55672ecf MS |
47 | struct mcheck_recoverable_range { |
48 | u64 start_addr; | |
49 | u64 end_addr; | |
50 | u64 recover_addr; | |
51 | }; | |
52 | ||
53 | static struct mcheck_recoverable_range *mc_recoverable_range; | |
54 | static int mc_recoverable_range_len; | |
55 | ||
bfc36894 | 56 | struct device_node *opal_node; |
14a43e69 | 57 | static DEFINE_SPINLOCK(opal_write_lock); |
24366360 | 58 | static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; |
3bf57561 | 59 | static uint32_t opal_heartbeat; |
a203658b | 60 | static struct task_struct *kopald_tsk; |
14a43e69 | 61 | |
d3cbff1b | 62 | void opal_configure_cores(void) |
4926616c | 63 | { |
1c0eaf0f BH |
64 | u64 reinit_flags = 0; |
65 | ||
4926616c BH |
66 | /* Do the actual re-init, This will clobber all FPRs, VRs, etc... |
67 | * | |
68 | * It will preserve non volatile GPRs and HSPRG0/1. It will | |
69 | * also restore HIDs and other SPRs to their original value | |
70 | * but it might clobber a bunch. | |
71 | */ | |
72 | #ifdef __BIG_ENDIAN__ | |
1c0eaf0f | 73 | reinit_flags |= OPAL_REINIT_CPUS_HILE_BE; |
4926616c | 74 | #else |
1c0eaf0f | 75 | reinit_flags |= OPAL_REINIT_CPUS_HILE_LE; |
4926616c | 76 | #endif |
d3cbff1b | 77 | |
1c0eaf0f BH |
78 | /* |
79 | * POWER9 always support running hash: | |
80 | * ie. Host hash supports hash guests | |
81 | * Host radix supports hash/radix guests | |
82 | */ | |
a70b487b | 83 | if (early_cpu_has_feature(CPU_FTR_ARCH_300)) { |
1c0eaf0f BH |
84 | reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH; |
85 | if (early_radix_enabled()) | |
86 | reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX; | |
87 | } | |
88 | ||
89 | opal_reinit_cpus(reinit_flags); | |
90 | ||
d3cbff1b BH |
91 | /* Restore some bits */ |
92 | if (cur_cpu_spec->cpu_restore) | |
93 | cur_cpu_spec->cpu_restore(); | |
4926616c BH |
94 | } |
95 | ||
14a43e69 BH |
96 | int __init early_init_dt_scan_opal(unsigned long node, |
97 | const char *uname, int depth, void *data) | |
98 | { | |
55672ecf | 99 | const void *basep, *entryp, *sizep; |
9d0c4dfe | 100 | int basesz, entrysz, runtimesz; |
14a43e69 BH |
101 | |
102 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
103 | return 0; | |
104 | ||
105 | basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); | |
106 | entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); | |
55672ecf | 107 | sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); |
14a43e69 | 108 | |
55672ecf | 109 | if (!basep || !entryp || !sizep) |
14a43e69 BH |
110 | return 1; |
111 | ||
112 | opal.base = of_read_number(basep, basesz/4); | |
113 | opal.entry = of_read_number(entryp, entrysz/4); | |
55672ecf | 114 | opal.size = of_read_number(sizep, runtimesz/4); |
14a43e69 | 115 | |
9d0c4dfe | 116 | pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", |
14a43e69 | 117 | opal.base, basep, basesz); |
9d0c4dfe | 118 | pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", |
14a43e69 | 119 | opal.entry, entryp, entrysz); |
9d0c4dfe | 120 | pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", |
55672ecf | 121 | opal.size, sizep, runtimesz); |
14a43e69 | 122 | |
75b93da4 | 123 | if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { |
e4d54f71 SS |
124 | powerpc_firmware_features |= FW_FEATURE_OPAL; |
125 | pr_info("OPAL detected !\n"); | |
14a43e69 | 126 | } else { |
786842b6 | 127 | panic("OPAL != V3 detected, no longer supported.\n"); |
14a43e69 BH |
128 | } |
129 | ||
c4463b37 JK |
130 | return 1; |
131 | } | |
132 | ||
55672ecf MS |
133 | int __init early_init_dt_scan_recoverable_ranges(unsigned long node, |
134 | const char *uname, int depth, void *data) | |
135 | { | |
9d0c4dfe | 136 | int i, psize, size; |
55672ecf MS |
137 | const __be32 *prop; |
138 | ||
139 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
140 | return 0; | |
141 | ||
6e556b47 | 142 | prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); |
55672ecf MS |
143 | |
144 | if (!prop) | |
145 | return 1; | |
146 | ||
147 | pr_debug("Found machine check recoverable ranges.\n"); | |
148 | ||
6e556b47 MS |
149 | /* |
150 | * Calculate number of available entries. | |
151 | * | |
152 | * Each recoverable address range entry is (start address, len, | |
153 | * recovery address), 2 cells each for start and recovery address, | |
154 | * 1 cell for len, totalling 5 cells per entry. | |
155 | */ | |
156 | mc_recoverable_range_len = psize / (sizeof(*prop) * 5); | |
157 | ||
158 | /* Sanity check */ | |
159 | if (!mc_recoverable_range_len) | |
160 | return 1; | |
161 | ||
162 | /* Size required to hold all the entries. */ | |
163 | size = mc_recoverable_range_len * | |
164 | sizeof(struct mcheck_recoverable_range); | |
165 | ||
55672ecf MS |
166 | /* |
167 | * Allocate a buffer to hold the MC recoverable ranges. We would be | |
168 | * accessing them in real mode, hence it needs to be within | |
169 | * RMO region. | |
170 | */ | |
171 | mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), | |
172 | ppc64_rma_size)); | |
173 | memset(mc_recoverable_range, 0, size); | |
174 | ||
6e556b47 | 175 | for (i = 0; i < mc_recoverable_range_len; i++) { |
55672ecf MS |
176 | mc_recoverable_range[i].start_addr = |
177 | of_read_number(prop + (i * 5) + 0, 2); | |
178 | mc_recoverable_range[i].end_addr = | |
179 | mc_recoverable_range[i].start_addr + | |
180 | of_read_number(prop + (i * 5) + 2, 1); | |
181 | mc_recoverable_range[i].recover_addr = | |
182 | of_read_number(prop + (i * 5) + 3, 2); | |
183 | ||
184 | pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", | |
185 | mc_recoverable_range[i].start_addr, | |
186 | mc_recoverable_range[i].end_addr, | |
187 | mc_recoverable_range[i].recover_addr); | |
188 | } | |
55672ecf MS |
189 | return 1; |
190 | } | |
191 | ||
c4463b37 JK |
192 | static int __init opal_register_exception_handlers(void) |
193 | { | |
29186097 | 194 | #ifdef __BIG_ENDIAN__ |
c4463b37 JK |
195 | u64 glue; |
196 | ||
197 | if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) | |
198 | return -ENODEV; | |
199 | ||
28446de2 MS |
200 | /* Hookup some exception handlers except machine check. We use the |
201 | * fwnmi area at 0x7000 to provide the glue space to OPAL | |
ed79ba9e BH |
202 | */ |
203 | glue = 0x7000; | |
6507955c MS |
204 | |
205 | /* | |
206 | * Check if we are running on newer firmware that exports | |
207 | * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch | |
208 | * the HMI interrupt and we catch it directly in Linux. | |
209 | * | |
210 | * For older firmware (i.e currently released POWER8 System Firmware | |
211 | * as of today <= SV810_087), we fallback to old behavior and let OPAL | |
212 | * patch the HMI vector and handle it inside OPAL firmware. | |
213 | * | |
214 | * For newer firmware (in development/yet to be released) we will | |
215 | * start catching/handling HMI directly in Linux. | |
216 | */ | |
217 | if (!opal_check_token(OPAL_HANDLE_HMI)) { | |
08135139 | 218 | pr_info("Old firmware detected, OPAL handles HMIs.\n"); |
6507955c MS |
219 | opal_register_exception_handler( |
220 | OPAL_HYPERVISOR_MAINTENANCE_HANDLER, | |
221 | 0, glue); | |
222 | glue += 128; | |
223 | } | |
224 | ||
ed79ba9e | 225 | opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); |
29186097 | 226 | #endif |
ed79ba9e | 227 | |
c4463b37 | 228 | return 0; |
14a43e69 | 229 | } |
b14726c5 | 230 | machine_early_initcall(powernv, opal_register_exception_handlers); |
c4463b37 | 231 | |
24366360 MS |
232 | /* |
233 | * Opal message notifier based on message type. Allow subscribers to get | |
234 | * notified for specific messgae type. | |
235 | */ | |
d7cf83fc | 236 | int opal_message_notifier_register(enum opal_msg_type msg_type, |
24366360 MS |
237 | struct notifier_block *nb) |
238 | { | |
792f96e9 NG |
239 | if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { |
240 | pr_warning("%s: Invalid arguments, msg_type:%d\n", | |
24366360 MS |
241 | __func__, msg_type); |
242 | return -EINVAL; | |
243 | } | |
792f96e9 | 244 | |
24366360 MS |
245 | return atomic_notifier_chain_register( |
246 | &opal_msg_notifier_head[msg_type], nb); | |
247 | } | |
594fcb9e | 248 | EXPORT_SYMBOL_GPL(opal_message_notifier_register); |
24366360 | 249 | |
df60f576 | 250 | int opal_message_notifier_unregister(enum opal_msg_type msg_type, |
b921e902 NG |
251 | struct notifier_block *nb) |
252 | { | |
253 | return atomic_notifier_chain_unregister( | |
254 | &opal_msg_notifier_head[msg_type], nb); | |
255 | } | |
594fcb9e | 256 | EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); |
b921e902 | 257 | |
24366360 MS |
258 | static void opal_message_do_notify(uint32_t msg_type, void *msg) |
259 | { | |
260 | /* notify subscribers */ | |
261 | atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], | |
262 | msg_type, msg); | |
263 | } | |
264 | ||
265 | static void opal_handle_message(void) | |
266 | { | |
267 | s64 ret; | |
268 | /* | |
269 | * TODO: pre-allocate a message buffer depending on opal-msg-size | |
270 | * value in /proc/device-tree. | |
271 | */ | |
272 | static struct opal_msg msg; | |
bb4398e1 | 273 | u32 type; |
24366360 MS |
274 | |
275 | ret = opal_get_msg(__pa(&msg), sizeof(msg)); | |
276 | /* No opal message pending. */ | |
277 | if (ret == OPAL_RESOURCE) | |
278 | return; | |
279 | ||
280 | /* check for errors. */ | |
281 | if (ret) { | |
1a84db56 | 282 | pr_warning("%s: Failed to retrieve opal message, err=%lld\n", |
24366360 MS |
283 | __func__, ret); |
284 | return; | |
285 | } | |
286 | ||
bb4398e1 AB |
287 | type = be32_to_cpu(msg.msg_type); |
288 | ||
24366360 | 289 | /* Sanity check */ |
792f96e9 | 290 | if (type >= OPAL_MSG_TYPE_MAX) { |
98da62b7 | 291 | pr_warn_once("%s: Unknown message type: %u\n", __func__, type); |
24366360 MS |
292 | return; |
293 | } | |
bb4398e1 | 294 | opal_message_do_notify(type, (void *)&msg); |
24366360 MS |
295 | } |
296 | ||
a295af24 | 297 | static irqreturn_t opal_message_notify(int irq, void *data) |
24366360 | 298 | { |
a295af24 AP |
299 | opal_handle_message(); |
300 | return IRQ_HANDLED; | |
24366360 MS |
301 | } |
302 | ||
24366360 MS |
303 | static int __init opal_message_init(void) |
304 | { | |
a295af24 | 305 | int ret, i, irq; |
24366360 MS |
306 | |
307 | for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) | |
308 | ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); | |
309 | ||
a295af24 AP |
310 | irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); |
311 | if (!irq) { | |
312 | pr_err("%s: Can't register OPAL event irq (%d)\n", | |
313 | __func__, irq); | |
314 | return irq; | |
315 | } | |
316 | ||
317 | ret = request_irq(irq, opal_message_notify, | |
318 | IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); | |
24366360 | 319 | if (ret) { |
a295af24 | 320 | pr_err("%s: Can't request OPAL event irq (%d)\n", |
24366360 MS |
321 | __func__, ret); |
322 | return ret; | |
323 | } | |
a295af24 | 324 | |
24366360 MS |
325 | return 0; |
326 | } | |
24366360 | 327 | |
14a43e69 BH |
328 | int opal_get_chars(uint32_t vtermno, char *buf, int count) |
329 | { | |
4f89363b BH |
330 | s64 rc; |
331 | __be64 evt, len; | |
14a43e69 BH |
332 | |
333 | if (!opal.entry) | |
daea1175 | 334 | return -ENODEV; |
14a43e69 | 335 | opal_poll_events(&evt); |
4f89363b | 336 | if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) |
14a43e69 | 337 | return 0; |
4f89363b | 338 | len = cpu_to_be64(count); |
9d0c4dfe | 339 | rc = opal_console_read(vtermno, &len, buf); |
14a43e69 | 340 | if (rc == OPAL_SUCCESS) |
4f89363b | 341 | return be64_to_cpu(len); |
14a43e69 BH |
342 | return 0; |
343 | } | |
344 | ||
345 | int opal_put_chars(uint32_t vtermno, const char *data, int total_len) | |
346 | { | |
347 | int written = 0; | |
4f89363b | 348 | __be64 olen; |
daea1175 | 349 | s64 len, rc; |
14a43e69 | 350 | unsigned long flags; |
4f89363b | 351 | __be64 evt; |
14a43e69 BH |
352 | |
353 | if (!opal.entry) | |
daea1175 | 354 | return -ENODEV; |
14a43e69 BH |
355 | |
356 | /* We want put_chars to be atomic to avoid mangling of hvsi | |
357 | * packets. To do that, we first test for room and return | |
daea1175 BH |
358 | * -EAGAIN if there isn't enough. |
359 | * | |
360 | * Unfortunately, opal_console_write_buffer_space() doesn't | |
361 | * appear to work on opal v1, so we just assume there is | |
362 | * enough room and be done with it | |
14a43e69 BH |
363 | */ |
364 | spin_lock_irqsave(&opal_write_lock, flags); | |
e4d54f71 SS |
365 | rc = opal_console_write_buffer_space(vtermno, &olen); |
366 | len = be64_to_cpu(olen); | |
367 | if (rc || len < total_len) { | |
368 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
369 | /* Closed -> drop characters */ | |
370 | if (rc) | |
371 | return total_len; | |
372 | opal_poll_events(NULL); | |
373 | return -EAGAIN; | |
14a43e69 BH |
374 | } |
375 | ||
376 | /* We still try to handle partial completions, though they | |
377 | * should no longer happen. | |
378 | */ | |
daea1175 | 379 | rc = OPAL_BUSY; |
14a43e69 BH |
380 | while(total_len > 0 && (rc == OPAL_BUSY || |
381 | rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { | |
4f89363b BH |
382 | olen = cpu_to_be64(total_len); |
383 | rc = opal_console_write(vtermno, &olen, data); | |
384 | len = be64_to_cpu(olen); | |
1de1455f BH |
385 | |
386 | /* Closed or other error drop */ | |
387 | if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && | |
388 | rc != OPAL_BUSY_EVENT) { | |
389 | written = total_len; | |
390 | break; | |
391 | } | |
14a43e69 BH |
392 | if (rc == OPAL_SUCCESS) { |
393 | total_len -= len; | |
394 | data += len; | |
395 | written += len; | |
396 | } | |
397 | /* This is a bit nasty but we need that for the console to | |
398 | * flush when there aren't any interrupts. We will clean | |
399 | * things a bit later to limit that to synchronous path | |
400 | * such as the kernel console and xmon/udbg | |
401 | */ | |
402 | do | |
403 | opal_poll_events(&evt); | |
4f89363b BH |
404 | while(rc == OPAL_SUCCESS && |
405 | (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); | |
14a43e69 BH |
406 | } |
407 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
408 | return written; | |
409 | } | |
410 | ||
b63a0ffe MS |
411 | static int opal_recover_mce(struct pt_regs *regs, |
412 | struct machine_check_event *evt) | |
413 | { | |
414 | int recovered = 0; | |
b63a0ffe MS |
415 | |
416 | if (!(regs->msr & MSR_RI)) { | |
417 | /* If MSR_RI isn't set, we cannot recover */ | |
c74dd88e | 418 | pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); |
b63a0ffe MS |
419 | recovered = 0; |
420 | } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { | |
421 | /* Platform corrected itself */ | |
422 | recovered = 1; | |
1363875b NP |
423 | } else if (evt->severity == MCE_SEV_FATAL) { |
424 | /* Fatal machine check */ | |
425 | pr_err("Machine check interrupt is fatal\n"); | |
426 | recovered = 0; | |
427 | } else if ((evt->severity == MCE_SEV_ERROR_SYNC) && | |
428 | (user_mode(regs) && !is_global_init(current))) { | |
b63a0ffe | 429 | /* |
b63a0ffe MS |
430 | * For now, kill the task if we have received exception when |
431 | * in userspace. | |
432 | * | |
433 | * TODO: Queue up this address for hwpoisioning later. | |
434 | */ | |
b63a0ffe MS |
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 | } | |
63f44d65 | 455 | machine_check_print_event_info(&evt, user_mode(regs)); |
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 | * | |
f2dd80ec DA |
490 | * If hardware marked this as an unrecoverable MCE, we are |
491 | * going to panic anyway. Even if it didn't, it's not safe to | |
492 | * continue at this point, so we should explicitly panic. | |
e784b649 | 493 | */ |
f2dd80ec DA |
494 | |
495 | panic("PowerNV Unrecovered Machine Check"); | |
b63a0ffe | 496 | return 0; |
ed79ba9e BH |
497 | } |
498 | ||
0869b6fd MS |
499 | /* Early hmi handler called in real mode. */ |
500 | int opal_hmi_exception_early(struct pt_regs *regs) | |
501 | { | |
0ef95b41 MS |
502 | s64 rc; |
503 | ||
504 | /* | |
505 | * call opal hmi handler. Pass paca address as token. | |
506 | * The return value OPAL_SUCCESS is an indication that there is | |
507 | * an HMI event generated waiting to pull by Linux. | |
508 | */ | |
509 | rc = opal_handle_hmi(); | |
510 | if (rc == OPAL_SUCCESS) { | |
511 | local_paca->hmi_event_available = 1; | |
512 | return 1; | |
513 | } | |
0869b6fd MS |
514 | return 0; |
515 | } | |
516 | ||
517 | /* HMI exception handler called in virtual mode during check_irq_replay. */ | |
518 | int opal_handle_hmi_exception(struct pt_regs *regs) | |
519 | { | |
0ef95b41 MS |
520 | s64 rc; |
521 | __be64 evt = 0; | |
522 | ||
523 | /* | |
524 | * Check if HMI event is available. | |
525 | * if Yes, then call opal_poll_events to pull opal messages and | |
526 | * process them. | |
527 | */ | |
528 | if (!local_paca->hmi_event_available) | |
529 | return 0; | |
530 | ||
531 | local_paca->hmi_event_available = 0; | |
532 | rc = opal_poll_events(&evt); | |
81f2f7ce | 533 | if (rc == OPAL_SUCCESS && evt) |
9f0fd049 | 534 | opal_handle_events(be64_to_cpu(evt)); |
0ef95b41 MS |
535 | |
536 | return 1; | |
0869b6fd MS |
537 | } |
538 | ||
55672ecf MS |
539 | static uint64_t find_recovery_address(uint64_t nip) |
540 | { | |
541 | int i; | |
542 | ||
543 | for (i = 0; i < mc_recoverable_range_len; i++) | |
544 | if ((nip >= mc_recoverable_range[i].start_addr) && | |
545 | (nip < mc_recoverable_range[i].end_addr)) | |
546 | return mc_recoverable_range[i].recover_addr; | |
547 | return 0; | |
548 | } | |
549 | ||
550 | bool opal_mce_check_early_recovery(struct pt_regs *regs) | |
551 | { | |
552 | uint64_t recover_addr = 0; | |
553 | ||
554 | if (!opal.base || !opal.size) | |
555 | goto out; | |
556 | ||
557 | if ((regs->nip >= opal.base) && | |
dc3799bb | 558 | (regs->nip < (opal.base + opal.size))) |
55672ecf MS |
559 | recover_addr = find_recovery_address(regs->nip); |
560 | ||
561 | /* | |
562 | * Setup regs->nip to rfi into fixup address. | |
563 | */ | |
564 | if (recover_addr) | |
565 | regs->nip = recover_addr; | |
566 | ||
567 | out: | |
568 | return !!recover_addr; | |
569 | } | |
570 | ||
6f68b5e2 VH |
571 | static int opal_sysfs_init(void) |
572 | { | |
573 | opal_kobj = kobject_create_and_add("opal", firmware_kobj); | |
574 | if (!opal_kobj) { | |
575 | pr_warn("kobject_create_and_add opal failed\n"); | |
576 | return -ENOMEM; | |
577 | } | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
c8742f85 BH |
582 | static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, |
583 | struct bin_attribute *bin_attr, | |
584 | char *buf, loff_t off, size_t count) | |
585 | { | |
586 | return memory_read_from_buffer(buf, count, &off, bin_attr->private, | |
587 | bin_attr->size); | |
588 | } | |
589 | ||
590 | static BIN_ATTR_RO(symbol_map, 0); | |
591 | ||
592 | static void opal_export_symmap(void) | |
593 | { | |
594 | const __be64 *syms; | |
595 | unsigned int size; | |
596 | struct device_node *fw; | |
597 | int rc; | |
598 | ||
599 | fw = of_find_node_by_path("/ibm,opal/firmware"); | |
600 | if (!fw) | |
601 | return; | |
602 | syms = of_get_property(fw, "symbol-map", &size); | |
603 | if (!syms || size != 2 * sizeof(__be64)) | |
604 | return; | |
605 | ||
606 | /* Setup attributes */ | |
607 | bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); | |
608 | bin_attr_symbol_map.size = be64_to_cpu(syms[1]); | |
609 | ||
610 | rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); | |
611 | if (rc) | |
612 | pr_warn("Error %d creating OPAL symbols file\n", rc); | |
613 | } | |
614 | ||
11fe909d MB |
615 | static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, |
616 | struct bin_attribute *bin_attr, char *buf, | |
617 | loff_t off, size_t count) | |
618 | { | |
619 | return memory_read_from_buffer(buf, count, &off, bin_attr->private, | |
620 | bin_attr->size); | |
621 | } | |
622 | ||
623 | /* | |
624 | * opal_export_attrs: creates a sysfs node for each property listed in | |
625 | * the device-tree under /ibm,opal/firmware/exports/ | |
626 | * All new sysfs nodes are created under /opal/exports/. | |
627 | * This allows for reserved memory regions (e.g. HDAT) to be read. | |
628 | * The new sysfs nodes are only readable by root. | |
629 | */ | |
630 | static void opal_export_attrs(void) | |
631 | { | |
632 | struct bin_attribute *attr; | |
633 | struct device_node *np; | |
634 | struct property *prop; | |
635 | struct kobject *kobj; | |
636 | u64 vals[2]; | |
637 | int rc; | |
638 | ||
639 | np = of_find_node_by_path("/ibm,opal/firmware/exports"); | |
640 | if (!np) | |
641 | return; | |
642 | ||
643 | /* Create new 'exports' directory - /sys/firmware/opal/exports */ | |
644 | kobj = kobject_create_and_add("exports", opal_kobj); | |
645 | if (!kobj) { | |
646 | pr_warn("kobject_create_and_add() of exports failed\n"); | |
647 | return; | |
648 | } | |
649 | ||
650 | for_each_property_of_node(np, prop) { | |
651 | if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) | |
652 | continue; | |
653 | ||
654 | if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) | |
655 | continue; | |
656 | ||
83c49190 | 657 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
11fe909d MB |
658 | |
659 | if (attr == NULL) { | |
660 | pr_warn("Failed kmalloc for bin_attribute!"); | |
661 | continue; | |
662 | } | |
663 | ||
83c49190 | 664 | sysfs_bin_attr_init(attr); |
11fe909d MB |
665 | attr->attr.name = kstrdup(prop->name, GFP_KERNEL); |
666 | attr->attr.mode = 0400; | |
667 | attr->read = export_attr_read; | |
668 | attr->private = __va(vals[0]); | |
669 | attr->size = vals[1]; | |
670 | ||
671 | if (attr->attr.name == NULL) { | |
672 | pr_warn("Failed kstrdup for bin_attribute attr.name"); | |
673 | kfree(attr); | |
674 | continue; | |
675 | } | |
676 | ||
677 | rc = sysfs_create_bin_file(kobj, attr); | |
678 | if (rc) { | |
679 | pr_warn("Error %d creating OPAL sysfs exports/%s file\n", | |
680 | rc, prop->name); | |
681 | kfree(attr->attr.name); | |
682 | kfree(attr); | |
683 | } | |
684 | } | |
685 | ||
686 | of_node_put(np); | |
687 | } | |
688 | ||
b09c2ec4 VH |
689 | static void __init opal_dump_region_init(void) |
690 | { | |
691 | void *addr; | |
692 | uint64_t size; | |
693 | int rc; | |
694 | ||
b962f5a4 SS |
695 | if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) |
696 | return; | |
697 | ||
b09c2ec4 VH |
698 | /* Register kernel log buffer */ |
699 | addr = log_buf_addr_get(); | |
6501ab5e PK |
700 | if (addr == NULL) |
701 | return; | |
702 | ||
b09c2ec4 | 703 | size = log_buf_len_get(); |
6501ab5e PK |
704 | if (size == 0) |
705 | return; | |
706 | ||
b09c2ec4 VH |
707 | rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, |
708 | __pa(addr), size); | |
709 | /* Don't warn if this is just an older OPAL that doesn't | |
710 | * know about that call | |
711 | */ | |
712 | if (rc && rc != OPAL_UNSUPPORTED) | |
713 | pr_warn("DUMP: Failed to register kernel log buffer. " | |
714 | "rc = %d\n", rc); | |
715 | } | |
608b286d | 716 | |
9e4f51bd | 717 | static void opal_pdev_init(const char *compatible) |
ed59190e CB |
718 | { |
719 | struct device_node *np; | |
720 | ||
9e4f51bd | 721 | for_each_compatible_node(np, NULL, compatible) |
47083450 NG |
722 | of_platform_device_create(np, NULL, NULL); |
723 | } | |
724 | ||
8f95faaa MS |
725 | static void __init opal_imc_init_dev(void) |
726 | { | |
727 | struct device_node *np; | |
728 | ||
729 | np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); | |
730 | if (np) | |
731 | of_platform_device_create(np, NULL, NULL); | |
732 | } | |
733 | ||
3bf57561 BH |
734 | static int kopald(void *unused) |
735 | { | |
a203658b | 736 | unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; |
9f0fd049 AP |
737 | __be64 events; |
738 | ||
3bf57561 BH |
739 | set_freezable(); |
740 | do { | |
741 | try_to_freeze(); | |
9f0fd049 AP |
742 | opal_poll_events(&events); |
743 | opal_handle_events(be64_to_cpu(events)); | |
a203658b | 744 | schedule_timeout_interruptible(timeout); |
3bf57561 BH |
745 | } while (!kthread_should_stop()); |
746 | ||
747 | return 0; | |
748 | } | |
749 | ||
a203658b BH |
750 | void opal_wake_poller(void) |
751 | { | |
752 | if (kopald_tsk) | |
753 | wake_up_process(kopald_tsk); | |
754 | } | |
755 | ||
3bf57561 BH |
756 | static void opal_init_heartbeat(void) |
757 | { | |
758 | /* Old firwmware, we assume the HVC heartbeat is sufficient */ | |
759 | if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", | |
760 | &opal_heartbeat) != 0) | |
761 | opal_heartbeat = 0; | |
762 | ||
763 | if (opal_heartbeat) | |
a203658b | 764 | kopald_tsk = kthread_run(kopald, NULL, "kopald"); |
3bf57561 BH |
765 | } |
766 | ||
14a43e69 BH |
767 | static int __init opal_init(void) |
768 | { | |
c159b596 | 769 | struct device_node *np, *consoles, *leds; |
c1c3a526 | 770 | int rc; |
14a43e69 BH |
771 | |
772 | opal_node = of_find_node_by_path("/ibm,opal"); | |
773 | if (!opal_node) { | |
08135139 | 774 | pr_warn("Device node not found\n"); |
14a43e69 BH |
775 | return -ENODEV; |
776 | } | |
2db29d28 BH |
777 | |
778 | /* Register OPAL consoles if any ports */ | |
7261aafc | 779 | consoles = of_find_node_by_path("/ibm,opal/consoles"); |
2db29d28 BH |
780 | if (consoles) { |
781 | for_each_child_of_node(consoles, np) { | |
782 | if (strcmp(np->name, "serial")) | |
783 | continue; | |
784 | of_platform_device_create(np, NULL, NULL); | |
785 | } | |
786 | of_node_put(consoles); | |
14a43e69 | 787 | } |
a125e092 | 788 | |
96e023e7 AP |
789 | /* Initialise OPAL messaging system */ |
790 | opal_message_init(); | |
791 | ||
792 | /* Initialise OPAL asynchronous completion interface */ | |
793 | opal_async_comp_init(); | |
794 | ||
795 | /* Initialise OPAL sensor interface */ | |
796 | opal_sensor_init(); | |
797 | ||
798 | /* Initialise OPAL hypervisor maintainence interrupt handling */ | |
799 | opal_hmi_handler_init(); | |
800 | ||
47083450 | 801 | /* Create i2c platform devices */ |
9e4f51bd | 802 | opal_pdev_init("ibm,opal-i2c"); |
47083450 | 803 | |
3bf57561 BH |
804 | /* Setup a heatbeat thread if requested by OPAL */ |
805 | opal_init_heartbeat(); | |
806 | ||
8f95faaa MS |
807 | /* Detect In-Memory Collection counters and create devices*/ |
808 | opal_imc_init_dev(); | |
809 | ||
c159b596 VH |
810 | /* Create leds platform devices */ |
811 | leds = of_find_node_by_path("/ibm,opal/leds"); | |
812 | if (leds) { | |
813 | of_platform_device_create(leds, "opal_leds", NULL); | |
814 | of_node_put(leds); | |
815 | } | |
816 | ||
9b4fffa1 AD |
817 | /* Initialise OPAL message log interface */ |
818 | opal_msglog_init(); | |
819 | ||
6f68b5e2 VH |
820 | /* Create "opal" kobject under /sys/firmware */ |
821 | rc = opal_sysfs_init(); | |
50bd6153 | 822 | if (rc == 0) { |
c8742f85 BH |
823 | /* Export symbol map to userspace */ |
824 | opal_export_symmap(); | |
b09c2ec4 VH |
825 | /* Setup dump region interface */ |
826 | opal_dump_region_init(); | |
774fea1a SS |
827 | /* Setup error log interface */ |
828 | rc = opal_elog_init(); | |
50bd6153 | 829 | /* Setup code update interface */ |
ed59190e | 830 | opal_flash_update_init(); |
c7e64b9c SS |
831 | /* Setup platform dump extract interface */ |
832 | opal_platform_dump_init(); | |
4029cd66 NG |
833 | /* Setup system parameters interface */ |
834 | opal_sys_param_init(); | |
9b4fffa1 AD |
835 | /* Setup message log sysfs interface. */ |
836 | opal_msglog_sysfs_init(); | |
50bd6153 | 837 | } |
6f68b5e2 | 838 | |
11fe909d MB |
839 | /* Export all properties */ |
840 | opal_export_attrs(); | |
841 | ||
0d7cd855 | 842 | /* Initialize platform devices: IPMI backend, PRD & flash interface */ |
9e4f51bd JM |
843 | opal_pdev_init("ibm,opal-ipmi"); |
844 | opal_pdev_init("ibm,opal-flash"); | |
845 | opal_pdev_init("ibm,opal-prd"); | |
ed59190e | 846 | |
43a1dd9b | 847 | /* Initialise platform device: oppanel interface */ |
9e4f51bd | 848 | opal_pdev_init("ibm,opal-oppanel"); |
43a1dd9b | 849 | |
affddff6 RC |
850 | /* Initialise OPAL kmsg dumper for flushing console on panic */ |
851 | opal_kmsg_init(); | |
852 | ||
cb8b340d SB |
853 | /* Initialise OPAL powercap interface */ |
854 | opal_powercap_init(); | |
855 | ||
14a43e69 BH |
856 | return 0; |
857 | } | |
b14726c5 | 858 | machine_subsys_initcall(powernv, opal_init); |
73ed148a BH |
859 | |
860 | void opal_shutdown(void) | |
861 | { | |
f7d98d18 | 862 | long rc = OPAL_BUSY; |
73ed148a | 863 | |
9f0fd049 | 864 | opal_event_shutdown(); |
f7d98d18 VH |
865 | |
866 | /* | |
867 | * Then sync with OPAL which ensure anything that can | |
868 | * potentially write to our memory has completed such | |
869 | * as an ongoing dump retrieval | |
870 | */ | |
871 | while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
872 | rc = opal_sync_host_reboot(); | |
873 | if (rc == OPAL_BUSY) | |
874 | opal_poll_events(NULL); | |
875 | else | |
876 | mdelay(10); | |
877 | } | |
b09c2ec4 VH |
878 | |
879 | /* Unregister memory dump region */ | |
b962f5a4 SS |
880 | if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) |
881 | opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); | |
73ed148a | 882 | } |
e28b05e7 JS |
883 | |
884 | /* Export this so that test modules can use it */ | |
885 | EXPORT_SYMBOL_GPL(opal_invalid_call); | |
594fcb9e JK |
886 | EXPORT_SYMBOL_GPL(opal_xscom_read); |
887 | EXPORT_SYMBOL_GPL(opal_xscom_write); | |
608b286d JK |
888 | EXPORT_SYMBOL_GPL(opal_ipmi_send); |
889 | EXPORT_SYMBOL_GPL(opal_ipmi_recv); | |
ed59190e CB |
890 | EXPORT_SYMBOL_GPL(opal_flash_read); |
891 | EXPORT_SYMBOL_GPL(opal_flash_write); | |
892 | EXPORT_SYMBOL_GPL(opal_flash_erase); | |
0d7cd855 | 893 | EXPORT_SYMBOL_GPL(opal_prd_msg); |
3441f04b AB |
894 | |
895 | /* Convert a region of vmalloc memory to an opal sg list */ | |
896 | struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, | |
897 | unsigned long vmalloc_size) | |
898 | { | |
899 | struct opal_sg_list *sg, *first = NULL; | |
900 | unsigned long i = 0; | |
901 | ||
902 | sg = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
903 | if (!sg) | |
904 | goto nomem; | |
905 | ||
906 | first = sg; | |
907 | ||
908 | while (vmalloc_size > 0) { | |
909 | uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; | |
910 | uint64_t length = min(vmalloc_size, PAGE_SIZE); | |
911 | ||
912 | sg->entry[i].data = cpu_to_be64(data); | |
913 | sg->entry[i].length = cpu_to_be64(length); | |
914 | i++; | |
915 | ||
916 | if (i >= SG_ENTRIES_PER_NODE) { | |
917 | struct opal_sg_list *next; | |
918 | ||
919 | next = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
920 | if (!next) | |
921 | goto nomem; | |
922 | ||
923 | sg->length = cpu_to_be64( | |
924 | i * sizeof(struct opal_sg_entry) + 16); | |
925 | i = 0; | |
926 | sg->next = cpu_to_be64(__pa(next)); | |
927 | sg = next; | |
928 | } | |
929 | ||
930 | vmalloc_addr += length; | |
931 | vmalloc_size -= length; | |
932 | } | |
933 | ||
934 | sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); | |
935 | ||
936 | return first; | |
937 | ||
938 | nomem: | |
939 | pr_err("%s : Failed to allocate memory\n", __func__); | |
940 | opal_free_sg_list(first); | |
941 | return NULL; | |
942 | } | |
943 | ||
944 | void opal_free_sg_list(struct opal_sg_list *sg) | |
945 | { | |
946 | while (sg) { | |
947 | uint64_t next = be64_to_cpu(sg->next); | |
948 | ||
949 | kfree(sg); | |
950 | ||
951 | if (next) | |
952 | sg = __va(next); | |
953 | else | |
954 | sg = NULL; | |
955 | } | |
956 | } | |
16b1d26e | 957 | |
e3c5c2e0 CLG |
958 | int opal_error_code(int rc) |
959 | { | |
960 | switch (rc) { | |
961 | case OPAL_SUCCESS: return 0; | |
962 | ||
963 | case OPAL_PARAMETER: return -EINVAL; | |
964 | case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; | |
965 | case OPAL_BUSY_EVENT: return -EBUSY; | |
966 | case OPAL_NO_MEM: return -ENOMEM; | |
14aae78f | 967 | case OPAL_PERMISSION: return -EPERM; |
e3c5c2e0 CLG |
968 | |
969 | case OPAL_UNSUPPORTED: return -EIO; | |
970 | case OPAL_HARDWARE: return -EIO; | |
971 | case OPAL_INTERNAL_ERROR: return -EIO; | |
cb8b340d | 972 | case OPAL_TIMEOUT: return -ETIMEDOUT; |
e3c5c2e0 CLG |
973 | default: |
974 | pr_err("%s: unexpected OPAL error %d\n", __func__, rc); | |
975 | return -EIO; | |
976 | } | |
977 | } | |
978 | ||
1d0761d2 AP |
979 | void powernv_set_nmmu_ptcr(unsigned long ptcr) |
980 | { | |
981 | int rc; | |
982 | ||
983 | if (firmware_has_feature(FW_FEATURE_OPAL)) { | |
984 | rc = opal_nmmu_set_ptcr(-1UL, ptcr); | |
985 | if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) | |
986 | pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); | |
987 | } | |
988 | } | |
989 | ||
16b1d26e NG |
990 | EXPORT_SYMBOL_GPL(opal_poll_events); |
991 | EXPORT_SYMBOL_GPL(opal_rtc_read); | |
992 | EXPORT_SYMBOL_GPL(opal_rtc_write); | |
993 | EXPORT_SYMBOL_GPL(opal_tpo_read); | |
994 | EXPORT_SYMBOL_GPL(opal_tpo_write); | |
47083450 | 995 | EXPORT_SYMBOL_GPL(opal_i2c_request); |
c159b596 VH |
996 | /* Export these symbols for PowerNV LED class driver */ |
997 | EXPORT_SYMBOL_GPL(opal_leds_get_ind); | |
998 | EXPORT_SYMBOL_GPL(opal_leds_set_ind); | |
43a1dd9b SJS |
999 | /* Export this symbol for PowerNV Operator Panel class driver */ |
1000 | EXPORT_SYMBOL_GPL(opal_write_oppanel_async); | |
ffe6d810 PM |
1001 | /* Export this for KVM */ |
1002 | EXPORT_SYMBOL_GPL(opal_int_set_mfrr); | |
5af50993 | 1003 | EXPORT_SYMBOL_GPL(opal_int_eoi); |