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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 | |
d3cbff1b | 60 | void opal_configure_cores(void) |
4926616c | 61 | { |
1c0eaf0f BH |
62 | u64 reinit_flags = 0; |
63 | ||
4926616c BH |
64 | /* Do the actual re-init, This will clobber all FPRs, VRs, etc... |
65 | * | |
66 | * It will preserve non volatile GPRs and HSPRG0/1. It will | |
67 | * also restore HIDs and other SPRs to their original value | |
68 | * but it might clobber a bunch. | |
69 | */ | |
70 | #ifdef __BIG_ENDIAN__ | |
1c0eaf0f | 71 | reinit_flags |= OPAL_REINIT_CPUS_HILE_BE; |
4926616c | 72 | #else |
1c0eaf0f | 73 | reinit_flags |= OPAL_REINIT_CPUS_HILE_LE; |
4926616c | 74 | #endif |
d3cbff1b | 75 | |
1c0eaf0f BH |
76 | /* |
77 | * POWER9 always support running hash: | |
78 | * ie. Host hash supports hash guests | |
79 | * Host radix supports hash/radix guests | |
80 | */ | |
a70b487b | 81 | if (early_cpu_has_feature(CPU_FTR_ARCH_300)) { |
1c0eaf0f BH |
82 | reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH; |
83 | if (early_radix_enabled()) | |
84 | reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX; | |
85 | } | |
86 | ||
87 | opal_reinit_cpus(reinit_flags); | |
88 | ||
d3cbff1b BH |
89 | /* Restore some bits */ |
90 | if (cur_cpu_spec->cpu_restore) | |
91 | cur_cpu_spec->cpu_restore(); | |
4926616c BH |
92 | } |
93 | ||
14a43e69 BH |
94 | int __init early_init_dt_scan_opal(unsigned long node, |
95 | const char *uname, int depth, void *data) | |
96 | { | |
55672ecf | 97 | const void *basep, *entryp, *sizep; |
9d0c4dfe | 98 | int basesz, entrysz, runtimesz; |
14a43e69 BH |
99 | |
100 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
101 | return 0; | |
102 | ||
103 | basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); | |
104 | entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); | |
55672ecf | 105 | sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); |
14a43e69 | 106 | |
55672ecf | 107 | if (!basep || !entryp || !sizep) |
14a43e69 BH |
108 | return 1; |
109 | ||
110 | opal.base = of_read_number(basep, basesz/4); | |
111 | opal.entry = of_read_number(entryp, entrysz/4); | |
55672ecf | 112 | opal.size = of_read_number(sizep, runtimesz/4); |
14a43e69 | 113 | |
9d0c4dfe | 114 | pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", |
14a43e69 | 115 | opal.base, basep, basesz); |
9d0c4dfe | 116 | pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", |
14a43e69 | 117 | opal.entry, entryp, entrysz); |
9d0c4dfe | 118 | pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", |
55672ecf | 119 | opal.size, sizep, runtimesz); |
14a43e69 | 120 | |
75b93da4 | 121 | if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { |
e4d54f71 SS |
122 | powerpc_firmware_features |= FW_FEATURE_OPAL; |
123 | pr_info("OPAL detected !\n"); | |
14a43e69 | 124 | } else { |
786842b6 | 125 | panic("OPAL != V3 detected, no longer supported.\n"); |
14a43e69 BH |
126 | } |
127 | ||
c4463b37 JK |
128 | return 1; |
129 | } | |
130 | ||
55672ecf MS |
131 | int __init early_init_dt_scan_recoverable_ranges(unsigned long node, |
132 | const char *uname, int depth, void *data) | |
133 | { | |
9d0c4dfe | 134 | int i, psize, size; |
55672ecf MS |
135 | const __be32 *prop; |
136 | ||
137 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
138 | return 0; | |
139 | ||
6e556b47 | 140 | prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); |
55672ecf MS |
141 | |
142 | if (!prop) | |
143 | return 1; | |
144 | ||
145 | pr_debug("Found machine check recoverable ranges.\n"); | |
146 | ||
6e556b47 MS |
147 | /* |
148 | * Calculate number of available entries. | |
149 | * | |
150 | * Each recoverable address range entry is (start address, len, | |
151 | * recovery address), 2 cells each for start and recovery address, | |
152 | * 1 cell for len, totalling 5 cells per entry. | |
153 | */ | |
154 | mc_recoverable_range_len = psize / (sizeof(*prop) * 5); | |
155 | ||
156 | /* Sanity check */ | |
157 | if (!mc_recoverable_range_len) | |
158 | return 1; | |
159 | ||
160 | /* Size required to hold all the entries. */ | |
161 | size = mc_recoverable_range_len * | |
162 | sizeof(struct mcheck_recoverable_range); | |
163 | ||
55672ecf MS |
164 | /* |
165 | * Allocate a buffer to hold the MC recoverable ranges. We would be | |
166 | * accessing them in real mode, hence it needs to be within | |
167 | * RMO region. | |
168 | */ | |
169 | mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), | |
170 | ppc64_rma_size)); | |
171 | memset(mc_recoverable_range, 0, size); | |
172 | ||
6e556b47 | 173 | for (i = 0; i < mc_recoverable_range_len; i++) { |
55672ecf MS |
174 | mc_recoverable_range[i].start_addr = |
175 | of_read_number(prop + (i * 5) + 0, 2); | |
176 | mc_recoverable_range[i].end_addr = | |
177 | mc_recoverable_range[i].start_addr + | |
178 | of_read_number(prop + (i * 5) + 2, 1); | |
179 | mc_recoverable_range[i].recover_addr = | |
180 | of_read_number(prop + (i * 5) + 3, 2); | |
181 | ||
182 | pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", | |
183 | mc_recoverable_range[i].start_addr, | |
184 | mc_recoverable_range[i].end_addr, | |
185 | mc_recoverable_range[i].recover_addr); | |
186 | } | |
55672ecf MS |
187 | return 1; |
188 | } | |
189 | ||
c4463b37 JK |
190 | static int __init opal_register_exception_handlers(void) |
191 | { | |
29186097 | 192 | #ifdef __BIG_ENDIAN__ |
c4463b37 JK |
193 | u64 glue; |
194 | ||
195 | if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) | |
196 | return -ENODEV; | |
197 | ||
28446de2 MS |
198 | /* Hookup some exception handlers except machine check. We use the |
199 | * fwnmi area at 0x7000 to provide the glue space to OPAL | |
ed79ba9e BH |
200 | */ |
201 | glue = 0x7000; | |
6507955c MS |
202 | |
203 | /* | |
204 | * Check if we are running on newer firmware that exports | |
205 | * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch | |
206 | * the HMI interrupt and we catch it directly in Linux. | |
207 | * | |
208 | * For older firmware (i.e currently released POWER8 System Firmware | |
209 | * as of today <= SV810_087), we fallback to old behavior and let OPAL | |
210 | * patch the HMI vector and handle it inside OPAL firmware. | |
211 | * | |
212 | * For newer firmware (in development/yet to be released) we will | |
213 | * start catching/handling HMI directly in Linux. | |
214 | */ | |
215 | if (!opal_check_token(OPAL_HANDLE_HMI)) { | |
08135139 | 216 | pr_info("Old firmware detected, OPAL handles HMIs.\n"); |
6507955c MS |
217 | opal_register_exception_handler( |
218 | OPAL_HYPERVISOR_MAINTENANCE_HANDLER, | |
219 | 0, glue); | |
220 | glue += 128; | |
221 | } | |
222 | ||
ed79ba9e | 223 | opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); |
29186097 | 224 | #endif |
ed79ba9e | 225 | |
c4463b37 | 226 | return 0; |
14a43e69 | 227 | } |
b14726c5 | 228 | machine_early_initcall(powernv, opal_register_exception_handlers); |
c4463b37 | 229 | |
24366360 MS |
230 | /* |
231 | * Opal message notifier based on message type. Allow subscribers to get | |
232 | * notified for specific messgae type. | |
233 | */ | |
d7cf83fc | 234 | int opal_message_notifier_register(enum opal_msg_type msg_type, |
24366360 MS |
235 | struct notifier_block *nb) |
236 | { | |
792f96e9 NG |
237 | if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { |
238 | pr_warning("%s: Invalid arguments, msg_type:%d\n", | |
24366360 MS |
239 | __func__, msg_type); |
240 | return -EINVAL; | |
241 | } | |
792f96e9 | 242 | |
24366360 MS |
243 | return atomic_notifier_chain_register( |
244 | &opal_msg_notifier_head[msg_type], nb); | |
245 | } | |
594fcb9e | 246 | EXPORT_SYMBOL_GPL(opal_message_notifier_register); |
24366360 | 247 | |
df60f576 | 248 | int opal_message_notifier_unregister(enum opal_msg_type msg_type, |
b921e902 NG |
249 | struct notifier_block *nb) |
250 | { | |
251 | return atomic_notifier_chain_unregister( | |
252 | &opal_msg_notifier_head[msg_type], nb); | |
253 | } | |
594fcb9e | 254 | EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); |
b921e902 | 255 | |
24366360 MS |
256 | static void opal_message_do_notify(uint32_t msg_type, void *msg) |
257 | { | |
258 | /* notify subscribers */ | |
259 | atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], | |
260 | msg_type, msg); | |
261 | } | |
262 | ||
263 | static void opal_handle_message(void) | |
264 | { | |
265 | s64 ret; | |
266 | /* | |
267 | * TODO: pre-allocate a message buffer depending on opal-msg-size | |
268 | * value in /proc/device-tree. | |
269 | */ | |
270 | static struct opal_msg msg; | |
bb4398e1 | 271 | u32 type; |
24366360 MS |
272 | |
273 | ret = opal_get_msg(__pa(&msg), sizeof(msg)); | |
274 | /* No opal message pending. */ | |
275 | if (ret == OPAL_RESOURCE) | |
276 | return; | |
277 | ||
278 | /* check for errors. */ | |
279 | if (ret) { | |
1a84db56 | 280 | pr_warning("%s: Failed to retrieve opal message, err=%lld\n", |
24366360 MS |
281 | __func__, ret); |
282 | return; | |
283 | } | |
284 | ||
bb4398e1 AB |
285 | type = be32_to_cpu(msg.msg_type); |
286 | ||
24366360 | 287 | /* Sanity check */ |
792f96e9 | 288 | if (type >= OPAL_MSG_TYPE_MAX) { |
98da62b7 | 289 | pr_warn_once("%s: Unknown message type: %u\n", __func__, type); |
24366360 MS |
290 | return; |
291 | } | |
bb4398e1 | 292 | opal_message_do_notify(type, (void *)&msg); |
24366360 MS |
293 | } |
294 | ||
a295af24 | 295 | static irqreturn_t opal_message_notify(int irq, void *data) |
24366360 | 296 | { |
a295af24 AP |
297 | opal_handle_message(); |
298 | return IRQ_HANDLED; | |
24366360 MS |
299 | } |
300 | ||
24366360 MS |
301 | static int __init opal_message_init(void) |
302 | { | |
a295af24 | 303 | int ret, i, irq; |
24366360 MS |
304 | |
305 | for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) | |
306 | ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); | |
307 | ||
a295af24 AP |
308 | irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); |
309 | if (!irq) { | |
310 | pr_err("%s: Can't register OPAL event irq (%d)\n", | |
311 | __func__, irq); | |
312 | return irq; | |
313 | } | |
314 | ||
315 | ret = request_irq(irq, opal_message_notify, | |
316 | IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); | |
24366360 | 317 | if (ret) { |
a295af24 | 318 | pr_err("%s: Can't request OPAL event irq (%d)\n", |
24366360 MS |
319 | __func__, ret); |
320 | return ret; | |
321 | } | |
a295af24 | 322 | |
24366360 MS |
323 | return 0; |
324 | } | |
24366360 | 325 | |
14a43e69 BH |
326 | int opal_get_chars(uint32_t vtermno, char *buf, int count) |
327 | { | |
4f89363b BH |
328 | s64 rc; |
329 | __be64 evt, len; | |
14a43e69 BH |
330 | |
331 | if (!opal.entry) | |
daea1175 | 332 | return -ENODEV; |
14a43e69 | 333 | opal_poll_events(&evt); |
4f89363b | 334 | if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) |
14a43e69 | 335 | return 0; |
4f89363b | 336 | len = cpu_to_be64(count); |
9d0c4dfe | 337 | rc = opal_console_read(vtermno, &len, buf); |
14a43e69 | 338 | if (rc == OPAL_SUCCESS) |
4f89363b | 339 | return be64_to_cpu(len); |
14a43e69 BH |
340 | return 0; |
341 | } | |
342 | ||
343 | int opal_put_chars(uint32_t vtermno, const char *data, int total_len) | |
344 | { | |
345 | int written = 0; | |
4f89363b | 346 | __be64 olen; |
daea1175 | 347 | s64 len, rc; |
14a43e69 | 348 | unsigned long flags; |
4f89363b | 349 | __be64 evt; |
14a43e69 BH |
350 | |
351 | if (!opal.entry) | |
daea1175 | 352 | return -ENODEV; |
14a43e69 BH |
353 | |
354 | /* We want put_chars to be atomic to avoid mangling of hvsi | |
355 | * packets. To do that, we first test for room and return | |
daea1175 BH |
356 | * -EAGAIN if there isn't enough. |
357 | * | |
358 | * Unfortunately, opal_console_write_buffer_space() doesn't | |
359 | * appear to work on opal v1, so we just assume there is | |
360 | * enough room and be done with it | |
14a43e69 BH |
361 | */ |
362 | spin_lock_irqsave(&opal_write_lock, flags); | |
e4d54f71 SS |
363 | rc = opal_console_write_buffer_space(vtermno, &olen); |
364 | len = be64_to_cpu(olen); | |
365 | if (rc || len < total_len) { | |
366 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
367 | /* Closed -> drop characters */ | |
368 | if (rc) | |
369 | return total_len; | |
370 | opal_poll_events(NULL); | |
371 | return -EAGAIN; | |
14a43e69 BH |
372 | } |
373 | ||
374 | /* We still try to handle partial completions, though they | |
375 | * should no longer happen. | |
376 | */ | |
daea1175 | 377 | rc = OPAL_BUSY; |
14a43e69 BH |
378 | while(total_len > 0 && (rc == OPAL_BUSY || |
379 | rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { | |
4f89363b BH |
380 | olen = cpu_to_be64(total_len); |
381 | rc = opal_console_write(vtermno, &olen, data); | |
382 | len = be64_to_cpu(olen); | |
1de1455f BH |
383 | |
384 | /* Closed or other error drop */ | |
385 | if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && | |
386 | rc != OPAL_BUSY_EVENT) { | |
387 | written = total_len; | |
388 | break; | |
389 | } | |
14a43e69 BH |
390 | if (rc == OPAL_SUCCESS) { |
391 | total_len -= len; | |
392 | data += len; | |
393 | written += len; | |
394 | } | |
395 | /* This is a bit nasty but we need that for the console to | |
396 | * flush when there aren't any interrupts. We will clean | |
397 | * things a bit later to limit that to synchronous path | |
398 | * such as the kernel console and xmon/udbg | |
399 | */ | |
400 | do | |
401 | opal_poll_events(&evt); | |
4f89363b BH |
402 | while(rc == OPAL_SUCCESS && |
403 | (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); | |
14a43e69 BH |
404 | } |
405 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
406 | return written; | |
407 | } | |
408 | ||
b63a0ffe MS |
409 | static int opal_recover_mce(struct pt_regs *regs, |
410 | struct machine_check_event *evt) | |
411 | { | |
412 | int recovered = 0; | |
b63a0ffe MS |
413 | |
414 | if (!(regs->msr & MSR_RI)) { | |
415 | /* If MSR_RI isn't set, we cannot recover */ | |
c74dd88e | 416 | pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); |
b63a0ffe MS |
417 | recovered = 0; |
418 | } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { | |
419 | /* Platform corrected itself */ | |
420 | recovered = 1; | |
1363875b NP |
421 | } else if (evt->severity == MCE_SEV_FATAL) { |
422 | /* Fatal machine check */ | |
423 | pr_err("Machine check interrupt is fatal\n"); | |
424 | recovered = 0; | |
425 | } else if ((evt->severity == MCE_SEV_ERROR_SYNC) && | |
426 | (user_mode(regs) && !is_global_init(current))) { | |
b63a0ffe | 427 | /* |
b63a0ffe MS |
428 | * For now, kill the task if we have received exception when |
429 | * in userspace. | |
430 | * | |
431 | * TODO: Queue up this address for hwpoisioning later. | |
432 | */ | |
b63a0ffe MS |
433 | _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); |
434 | recovered = 1; | |
435 | } | |
436 | return recovered; | |
437 | } | |
438 | ||
ed79ba9e BH |
439 | int opal_machine_check(struct pt_regs *regs) |
440 | { | |
36df96f8 | 441 | struct machine_check_event evt; |
e784b649 | 442 | int ret; |
ed79ba9e | 443 | |
36df96f8 MS |
444 | if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) |
445 | return 0; | |
ed79ba9e BH |
446 | |
447 | /* Print things out */ | |
36df96f8 | 448 | if (evt.version != MCE_V1) { |
ed79ba9e BH |
449 | pr_err("Machine Check Exception, Unknown event version %d !\n", |
450 | evt.version); | |
451 | return 0; | |
452 | } | |
63f44d65 | 453 | machine_check_print_event_info(&evt, user_mode(regs)); |
ed79ba9e | 454 | |
b63a0ffe MS |
455 | if (opal_recover_mce(regs, &evt)) |
456 | return 1; | |
e784b649 MS |
457 | |
458 | /* | |
459 | * Unrecovered machine check, we are heading to panic path. | |
460 | * | |
461 | * We may have hit this MCE in very early stage of kernel | |
462 | * initialization even before opal-prd has started running. If | |
463 | * this is the case then this MCE error may go un-noticed or | |
464 | * un-analyzed if we go down panic path. We need to inform | |
465 | * BMC/OCC about this error so that they can collect relevant | |
466 | * data for error analysis before rebooting. | |
467 | * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so. | |
468 | * This function may not return on BMC based system. | |
469 | */ | |
470 | ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, | |
471 | "Unrecoverable Machine Check exception"); | |
472 | if (ret == OPAL_UNSUPPORTED) { | |
473 | pr_emerg("Reboot type %d not supported\n", | |
474 | OPAL_REBOOT_PLATFORM_ERROR); | |
475 | } | |
476 | ||
477 | /* | |
478 | * We reached here. There can be three possibilities: | |
479 | * 1. We are running on a firmware level that do not support | |
480 | * opal_cec_reboot2() | |
481 | * 2. We are running on a firmware level that do not support | |
482 | * OPAL_REBOOT_PLATFORM_ERROR reboot type. | |
483 | * 3. We are running on FSP based system that does not need opal | |
484 | * to trigger checkstop explicitly for error analysis. The FSP | |
485 | * PRD component would have already got notified about this | |
486 | * error through other channels. | |
487 | * | |
f2dd80ec DA |
488 | * If hardware marked this as an unrecoverable MCE, we are |
489 | * going to panic anyway. Even if it didn't, it's not safe to | |
490 | * continue at this point, so we should explicitly panic. | |
e784b649 | 491 | */ |
f2dd80ec DA |
492 | |
493 | panic("PowerNV Unrecovered Machine Check"); | |
b63a0ffe | 494 | return 0; |
ed79ba9e BH |
495 | } |
496 | ||
0869b6fd MS |
497 | /* Early hmi handler called in real mode. */ |
498 | int opal_hmi_exception_early(struct pt_regs *regs) | |
499 | { | |
0ef95b41 MS |
500 | s64 rc; |
501 | ||
502 | /* | |
503 | * call opal hmi handler. Pass paca address as token. | |
504 | * The return value OPAL_SUCCESS is an indication that there is | |
505 | * an HMI event generated waiting to pull by Linux. | |
506 | */ | |
507 | rc = opal_handle_hmi(); | |
508 | if (rc == OPAL_SUCCESS) { | |
509 | local_paca->hmi_event_available = 1; | |
510 | return 1; | |
511 | } | |
0869b6fd MS |
512 | return 0; |
513 | } | |
514 | ||
515 | /* HMI exception handler called in virtual mode during check_irq_replay. */ | |
516 | int opal_handle_hmi_exception(struct pt_regs *regs) | |
517 | { | |
0ef95b41 MS |
518 | s64 rc; |
519 | __be64 evt = 0; | |
520 | ||
521 | /* | |
522 | * Check if HMI event is available. | |
523 | * if Yes, then call opal_poll_events to pull opal messages and | |
524 | * process them. | |
525 | */ | |
526 | if (!local_paca->hmi_event_available) | |
527 | return 0; | |
528 | ||
529 | local_paca->hmi_event_available = 0; | |
530 | rc = opal_poll_events(&evt); | |
81f2f7ce | 531 | if (rc == OPAL_SUCCESS && evt) |
9f0fd049 | 532 | opal_handle_events(be64_to_cpu(evt)); |
0ef95b41 MS |
533 | |
534 | return 1; | |
0869b6fd MS |
535 | } |
536 | ||
55672ecf MS |
537 | static uint64_t find_recovery_address(uint64_t nip) |
538 | { | |
539 | int i; | |
540 | ||
541 | for (i = 0; i < mc_recoverable_range_len; i++) | |
542 | if ((nip >= mc_recoverable_range[i].start_addr) && | |
543 | (nip < mc_recoverable_range[i].end_addr)) | |
544 | return mc_recoverable_range[i].recover_addr; | |
545 | return 0; | |
546 | } | |
547 | ||
548 | bool opal_mce_check_early_recovery(struct pt_regs *regs) | |
549 | { | |
550 | uint64_t recover_addr = 0; | |
551 | ||
552 | if (!opal.base || !opal.size) | |
553 | goto out; | |
554 | ||
555 | if ((regs->nip >= opal.base) && | |
dc3799bb | 556 | (regs->nip < (opal.base + opal.size))) |
55672ecf MS |
557 | recover_addr = find_recovery_address(regs->nip); |
558 | ||
559 | /* | |
560 | * Setup regs->nip to rfi into fixup address. | |
561 | */ | |
562 | if (recover_addr) | |
563 | regs->nip = recover_addr; | |
564 | ||
565 | out: | |
566 | return !!recover_addr; | |
567 | } | |
568 | ||
6f68b5e2 VH |
569 | static int opal_sysfs_init(void) |
570 | { | |
571 | opal_kobj = kobject_create_and_add("opal", firmware_kobj); | |
572 | if (!opal_kobj) { | |
573 | pr_warn("kobject_create_and_add opal failed\n"); | |
574 | return -ENOMEM; | |
575 | } | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
c8742f85 BH |
580 | static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, |
581 | struct bin_attribute *bin_attr, | |
582 | char *buf, loff_t off, size_t count) | |
583 | { | |
584 | return memory_read_from_buffer(buf, count, &off, bin_attr->private, | |
585 | bin_attr->size); | |
586 | } | |
587 | ||
588 | static BIN_ATTR_RO(symbol_map, 0); | |
589 | ||
590 | static void opal_export_symmap(void) | |
591 | { | |
592 | const __be64 *syms; | |
593 | unsigned int size; | |
594 | struct device_node *fw; | |
595 | int rc; | |
596 | ||
597 | fw = of_find_node_by_path("/ibm,opal/firmware"); | |
598 | if (!fw) | |
599 | return; | |
600 | syms = of_get_property(fw, "symbol-map", &size); | |
601 | if (!syms || size != 2 * sizeof(__be64)) | |
602 | return; | |
603 | ||
604 | /* Setup attributes */ | |
605 | bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); | |
606 | bin_attr_symbol_map.size = be64_to_cpu(syms[1]); | |
607 | ||
608 | rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); | |
609 | if (rc) | |
610 | pr_warn("Error %d creating OPAL symbols file\n", rc); | |
611 | } | |
612 | ||
11fe909d MB |
613 | static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, |
614 | struct bin_attribute *bin_attr, char *buf, | |
615 | loff_t off, size_t count) | |
616 | { | |
617 | return memory_read_from_buffer(buf, count, &off, bin_attr->private, | |
618 | bin_attr->size); | |
619 | } | |
620 | ||
621 | /* | |
622 | * opal_export_attrs: creates a sysfs node for each property listed in | |
623 | * the device-tree under /ibm,opal/firmware/exports/ | |
624 | * All new sysfs nodes are created under /opal/exports/. | |
625 | * This allows for reserved memory regions (e.g. HDAT) to be read. | |
626 | * The new sysfs nodes are only readable by root. | |
627 | */ | |
628 | static void opal_export_attrs(void) | |
629 | { | |
630 | struct bin_attribute *attr; | |
631 | struct device_node *np; | |
632 | struct property *prop; | |
633 | struct kobject *kobj; | |
634 | u64 vals[2]; | |
635 | int rc; | |
636 | ||
637 | np = of_find_node_by_path("/ibm,opal/firmware/exports"); | |
638 | if (!np) | |
639 | return; | |
640 | ||
641 | /* Create new 'exports' directory - /sys/firmware/opal/exports */ | |
642 | kobj = kobject_create_and_add("exports", opal_kobj); | |
643 | if (!kobj) { | |
644 | pr_warn("kobject_create_and_add() of exports failed\n"); | |
645 | return; | |
646 | } | |
647 | ||
648 | for_each_property_of_node(np, prop) { | |
649 | if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) | |
650 | continue; | |
651 | ||
652 | if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) | |
653 | continue; | |
654 | ||
83c49190 | 655 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
11fe909d MB |
656 | |
657 | if (attr == NULL) { | |
658 | pr_warn("Failed kmalloc for bin_attribute!"); | |
659 | continue; | |
660 | } | |
661 | ||
83c49190 | 662 | sysfs_bin_attr_init(attr); |
11fe909d MB |
663 | attr->attr.name = kstrdup(prop->name, GFP_KERNEL); |
664 | attr->attr.mode = 0400; | |
665 | attr->read = export_attr_read; | |
666 | attr->private = __va(vals[0]); | |
667 | attr->size = vals[1]; | |
668 | ||
669 | if (attr->attr.name == NULL) { | |
670 | pr_warn("Failed kstrdup for bin_attribute attr.name"); | |
671 | kfree(attr); | |
672 | continue; | |
673 | } | |
674 | ||
675 | rc = sysfs_create_bin_file(kobj, attr); | |
676 | if (rc) { | |
677 | pr_warn("Error %d creating OPAL sysfs exports/%s file\n", | |
678 | rc, prop->name); | |
679 | kfree(attr->attr.name); | |
680 | kfree(attr); | |
681 | } | |
682 | } | |
683 | ||
684 | of_node_put(np); | |
685 | } | |
686 | ||
b09c2ec4 VH |
687 | static void __init opal_dump_region_init(void) |
688 | { | |
689 | void *addr; | |
690 | uint64_t size; | |
691 | int rc; | |
692 | ||
b962f5a4 SS |
693 | if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) |
694 | return; | |
695 | ||
b09c2ec4 VH |
696 | /* Register kernel log buffer */ |
697 | addr = log_buf_addr_get(); | |
6501ab5e PK |
698 | if (addr == NULL) |
699 | return; | |
700 | ||
b09c2ec4 | 701 | size = log_buf_len_get(); |
6501ab5e PK |
702 | if (size == 0) |
703 | return; | |
704 | ||
b09c2ec4 VH |
705 | rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, |
706 | __pa(addr), size); | |
707 | /* Don't warn if this is just an older OPAL that doesn't | |
708 | * know about that call | |
709 | */ | |
710 | if (rc && rc != OPAL_UNSUPPORTED) | |
711 | pr_warn("DUMP: Failed to register kernel log buffer. " | |
712 | "rc = %d\n", rc); | |
713 | } | |
608b286d | 714 | |
9e4f51bd | 715 | static void opal_pdev_init(const char *compatible) |
ed59190e CB |
716 | { |
717 | struct device_node *np; | |
718 | ||
9e4f51bd | 719 | for_each_compatible_node(np, NULL, compatible) |
47083450 NG |
720 | of_platform_device_create(np, NULL, NULL); |
721 | } | |
722 | ||
3bf57561 BH |
723 | static int kopald(void *unused) |
724 | { | |
a203658b | 725 | unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; |
9f0fd049 AP |
726 | __be64 events; |
727 | ||
3bf57561 BH |
728 | set_freezable(); |
729 | do { | |
730 | try_to_freeze(); | |
9f0fd049 AP |
731 | opal_poll_events(&events); |
732 | opal_handle_events(be64_to_cpu(events)); | |
a203658b | 733 | schedule_timeout_interruptible(timeout); |
3bf57561 BH |
734 | } while (!kthread_should_stop()); |
735 | ||
736 | return 0; | |
737 | } | |
738 | ||
a203658b BH |
739 | void opal_wake_poller(void) |
740 | { | |
741 | if (kopald_tsk) | |
742 | wake_up_process(kopald_tsk); | |
743 | } | |
744 | ||
3bf57561 BH |
745 | static void opal_init_heartbeat(void) |
746 | { | |
747 | /* Old firwmware, we assume the HVC heartbeat is sufficient */ | |
748 | if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", | |
749 | &opal_heartbeat) != 0) | |
750 | opal_heartbeat = 0; | |
751 | ||
752 | if (opal_heartbeat) | |
a203658b | 753 | kopald_tsk = kthread_run(kopald, NULL, "kopald"); |
3bf57561 BH |
754 | } |
755 | ||
14a43e69 BH |
756 | static int __init opal_init(void) |
757 | { | |
c159b596 | 758 | struct device_node *np, *consoles, *leds; |
c1c3a526 | 759 | int rc; |
14a43e69 BH |
760 | |
761 | opal_node = of_find_node_by_path("/ibm,opal"); | |
762 | if (!opal_node) { | |
08135139 | 763 | pr_warn("Device node not found\n"); |
14a43e69 BH |
764 | return -ENODEV; |
765 | } | |
2db29d28 BH |
766 | |
767 | /* Register OPAL consoles if any ports */ | |
7261aafc | 768 | consoles = of_find_node_by_path("/ibm,opal/consoles"); |
2db29d28 BH |
769 | if (consoles) { |
770 | for_each_child_of_node(consoles, np) { | |
771 | if (strcmp(np->name, "serial")) | |
772 | continue; | |
773 | of_platform_device_create(np, NULL, NULL); | |
774 | } | |
775 | of_node_put(consoles); | |
14a43e69 | 776 | } |
a125e092 | 777 | |
96e023e7 AP |
778 | /* Initialise OPAL messaging system */ |
779 | opal_message_init(); | |
780 | ||
781 | /* Initialise OPAL asynchronous completion interface */ | |
782 | opal_async_comp_init(); | |
783 | ||
784 | /* Initialise OPAL sensor interface */ | |
785 | opal_sensor_init(); | |
786 | ||
787 | /* Initialise OPAL hypervisor maintainence interrupt handling */ | |
788 | opal_hmi_handler_init(); | |
789 | ||
47083450 | 790 | /* Create i2c platform devices */ |
9e4f51bd | 791 | opal_pdev_init("ibm,opal-i2c"); |
47083450 | 792 | |
3bf57561 BH |
793 | /* Setup a heatbeat thread if requested by OPAL */ |
794 | opal_init_heartbeat(); | |
795 | ||
c159b596 VH |
796 | /* Create leds platform devices */ |
797 | leds = of_find_node_by_path("/ibm,opal/leds"); | |
798 | if (leds) { | |
799 | of_platform_device_create(leds, "opal_leds", NULL); | |
800 | of_node_put(leds); | |
801 | } | |
802 | ||
9b4fffa1 AD |
803 | /* Initialise OPAL message log interface */ |
804 | opal_msglog_init(); | |
805 | ||
6f68b5e2 VH |
806 | /* Create "opal" kobject under /sys/firmware */ |
807 | rc = opal_sysfs_init(); | |
50bd6153 | 808 | if (rc == 0) { |
c8742f85 BH |
809 | /* Export symbol map to userspace */ |
810 | opal_export_symmap(); | |
b09c2ec4 VH |
811 | /* Setup dump region interface */ |
812 | opal_dump_region_init(); | |
774fea1a SS |
813 | /* Setup error log interface */ |
814 | rc = opal_elog_init(); | |
50bd6153 | 815 | /* Setup code update interface */ |
ed59190e | 816 | opal_flash_update_init(); |
c7e64b9c SS |
817 | /* Setup platform dump extract interface */ |
818 | opal_platform_dump_init(); | |
4029cd66 NG |
819 | /* Setup system parameters interface */ |
820 | opal_sys_param_init(); | |
9b4fffa1 AD |
821 | /* Setup message log sysfs interface. */ |
822 | opal_msglog_sysfs_init(); | |
50bd6153 | 823 | } |
6f68b5e2 | 824 | |
11fe909d MB |
825 | /* Export all properties */ |
826 | opal_export_attrs(); | |
827 | ||
0d7cd855 | 828 | /* Initialize platform devices: IPMI backend, PRD & flash interface */ |
9e4f51bd JM |
829 | opal_pdev_init("ibm,opal-ipmi"); |
830 | opal_pdev_init("ibm,opal-flash"); | |
831 | opal_pdev_init("ibm,opal-prd"); | |
ed59190e | 832 | |
43a1dd9b | 833 | /* Initialise platform device: oppanel interface */ |
9e4f51bd | 834 | opal_pdev_init("ibm,opal-oppanel"); |
43a1dd9b | 835 | |
affddff6 RC |
836 | /* Initialise OPAL kmsg dumper for flushing console on panic */ |
837 | opal_kmsg_init(); | |
838 | ||
14a43e69 BH |
839 | return 0; |
840 | } | |
b14726c5 | 841 | machine_subsys_initcall(powernv, opal_init); |
73ed148a BH |
842 | |
843 | void opal_shutdown(void) | |
844 | { | |
f7d98d18 | 845 | long rc = OPAL_BUSY; |
73ed148a | 846 | |
9f0fd049 | 847 | opal_event_shutdown(); |
f7d98d18 VH |
848 | |
849 | /* | |
850 | * Then sync with OPAL which ensure anything that can | |
851 | * potentially write to our memory has completed such | |
852 | * as an ongoing dump retrieval | |
853 | */ | |
854 | while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
855 | rc = opal_sync_host_reboot(); | |
856 | if (rc == OPAL_BUSY) | |
857 | opal_poll_events(NULL); | |
858 | else | |
859 | mdelay(10); | |
860 | } | |
b09c2ec4 VH |
861 | |
862 | /* Unregister memory dump region */ | |
b962f5a4 SS |
863 | if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) |
864 | opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); | |
73ed148a | 865 | } |
e28b05e7 JS |
866 | |
867 | /* Export this so that test modules can use it */ | |
868 | EXPORT_SYMBOL_GPL(opal_invalid_call); | |
594fcb9e JK |
869 | EXPORT_SYMBOL_GPL(opal_xscom_read); |
870 | EXPORT_SYMBOL_GPL(opal_xscom_write); | |
608b286d JK |
871 | EXPORT_SYMBOL_GPL(opal_ipmi_send); |
872 | EXPORT_SYMBOL_GPL(opal_ipmi_recv); | |
ed59190e CB |
873 | EXPORT_SYMBOL_GPL(opal_flash_read); |
874 | EXPORT_SYMBOL_GPL(opal_flash_write); | |
875 | EXPORT_SYMBOL_GPL(opal_flash_erase); | |
0d7cd855 | 876 | EXPORT_SYMBOL_GPL(opal_prd_msg); |
3441f04b AB |
877 | |
878 | /* Convert a region of vmalloc memory to an opal sg list */ | |
879 | struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, | |
880 | unsigned long vmalloc_size) | |
881 | { | |
882 | struct opal_sg_list *sg, *first = NULL; | |
883 | unsigned long i = 0; | |
884 | ||
885 | sg = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
886 | if (!sg) | |
887 | goto nomem; | |
888 | ||
889 | first = sg; | |
890 | ||
891 | while (vmalloc_size > 0) { | |
892 | uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; | |
893 | uint64_t length = min(vmalloc_size, PAGE_SIZE); | |
894 | ||
895 | sg->entry[i].data = cpu_to_be64(data); | |
896 | sg->entry[i].length = cpu_to_be64(length); | |
897 | i++; | |
898 | ||
899 | if (i >= SG_ENTRIES_PER_NODE) { | |
900 | struct opal_sg_list *next; | |
901 | ||
902 | next = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
903 | if (!next) | |
904 | goto nomem; | |
905 | ||
906 | sg->length = cpu_to_be64( | |
907 | i * sizeof(struct opal_sg_entry) + 16); | |
908 | i = 0; | |
909 | sg->next = cpu_to_be64(__pa(next)); | |
910 | sg = next; | |
911 | } | |
912 | ||
913 | vmalloc_addr += length; | |
914 | vmalloc_size -= length; | |
915 | } | |
916 | ||
917 | sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); | |
918 | ||
919 | return first; | |
920 | ||
921 | nomem: | |
922 | pr_err("%s : Failed to allocate memory\n", __func__); | |
923 | opal_free_sg_list(first); | |
924 | return NULL; | |
925 | } | |
926 | ||
927 | void opal_free_sg_list(struct opal_sg_list *sg) | |
928 | { | |
929 | while (sg) { | |
930 | uint64_t next = be64_to_cpu(sg->next); | |
931 | ||
932 | kfree(sg); | |
933 | ||
934 | if (next) | |
935 | sg = __va(next); | |
936 | else | |
937 | sg = NULL; | |
938 | } | |
939 | } | |
16b1d26e | 940 | |
e3c5c2e0 CLG |
941 | int opal_error_code(int rc) |
942 | { | |
943 | switch (rc) { | |
944 | case OPAL_SUCCESS: return 0; | |
945 | ||
946 | case OPAL_PARAMETER: return -EINVAL; | |
947 | case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; | |
948 | case OPAL_BUSY_EVENT: return -EBUSY; | |
949 | case OPAL_NO_MEM: return -ENOMEM; | |
14aae78f | 950 | case OPAL_PERMISSION: return -EPERM; |
e3c5c2e0 CLG |
951 | |
952 | case OPAL_UNSUPPORTED: return -EIO; | |
953 | case OPAL_HARDWARE: return -EIO; | |
954 | case OPAL_INTERNAL_ERROR: return -EIO; | |
955 | default: | |
956 | pr_err("%s: unexpected OPAL error %d\n", __func__, rc); | |
957 | return -EIO; | |
958 | } | |
959 | } | |
960 | ||
1d0761d2 AP |
961 | void powernv_set_nmmu_ptcr(unsigned long ptcr) |
962 | { | |
963 | int rc; | |
964 | ||
965 | if (firmware_has_feature(FW_FEATURE_OPAL)) { | |
966 | rc = opal_nmmu_set_ptcr(-1UL, ptcr); | |
967 | if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) | |
968 | pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); | |
969 | } | |
970 | } | |
971 | ||
16b1d26e NG |
972 | EXPORT_SYMBOL_GPL(opal_poll_events); |
973 | EXPORT_SYMBOL_GPL(opal_rtc_read); | |
974 | EXPORT_SYMBOL_GPL(opal_rtc_write); | |
975 | EXPORT_SYMBOL_GPL(opal_tpo_read); | |
976 | EXPORT_SYMBOL_GPL(opal_tpo_write); | |
47083450 | 977 | EXPORT_SYMBOL_GPL(opal_i2c_request); |
c159b596 VH |
978 | /* Export these symbols for PowerNV LED class driver */ |
979 | EXPORT_SYMBOL_GPL(opal_leds_get_ind); | |
980 | EXPORT_SYMBOL_GPL(opal_leds_set_ind); | |
43a1dd9b SJS |
981 | /* Export this symbol for PowerNV Operator Panel class driver */ |
982 | EXPORT_SYMBOL_GPL(opal_write_oppanel_async); | |
ffe6d810 PM |
983 | /* Export this for KVM */ |
984 | EXPORT_SYMBOL_GPL(opal_int_set_mfrr); | |
5af50993 | 985 | EXPORT_SYMBOL_GPL(opal_int_eoi); |