]>
Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
14a43e69 BH |
2 | /* |
3 | * PowerNV OPAL high level interfaces | |
4 | * | |
5 | * Copyright 2011 IBM Corp. | |
14a43e69 BH |
6 | */ |
7 | ||
c8742f85 | 8 | #define pr_fmt(fmt) "opal: " fmt |
14a43e69 | 9 | |
c8742f85 | 10 | #include <linux/printk.h> |
14a43e69 BH |
11 | #include <linux/types.h> |
12 | #include <linux/of.h> | |
26a2056e | 13 | #include <linux/of_fdt.h> |
14a43e69 | 14 | #include <linux/of_platform.h> |
8f95faaa | 15 | #include <linux/of_address.h> |
a125e092 | 16 | #include <linux/interrupt.h> |
1bc98de2 | 17 | #include <linux/notifier.h> |
73ed148a | 18 | #include <linux/slab.h> |
b63a0ffe | 19 | #include <linux/sched.h> |
6f68b5e2 | 20 | #include <linux/kobject.h> |
f7d98d18 | 21 | #include <linux/delay.h> |
55672ecf | 22 | #include <linux/memblock.h> |
3bf57561 BH |
23 | #include <linux/kthread.h> |
24 | #include <linux/freezer.h> | |
b746e3e0 NP |
25 | #include <linux/kmsg_dump.h> |
26 | #include <linux/console.h> | |
27 | #include <linux/sched/debug.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> |
8f95faaa | 33 | #include <asm/imc-pmu.h> |
6fcd6baa | 34 | #include <asm/bug.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 | 124 | powerpc_firmware_features |= FW_FEATURE_OPAL; |
5138b314 | 125 | pr_debug("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 | 166 | /* |
76b42e28 | 167 | * Allocate a buffer to hold the MC recoverable ranges. |
55672ecf | 168 | */ |
b63a07d6 | 169 | mc_recoverable_range = memblock_alloc(size, __alignof__(u64)); |
8a7f97b9 MR |
170 | if (!mc_recoverable_range) |
171 | panic("%s: Failed to allocate %u bytes align=0x%lx\n", | |
172 | __func__, size, __alignof__(u64)); | |
55672ecf | 173 | |
6e556b47 | 174 | for (i = 0; i < mc_recoverable_range_len; i++) { |
55672ecf MS |
175 | mc_recoverable_range[i].start_addr = |
176 | of_read_number(prop + (i * 5) + 0, 2); | |
177 | mc_recoverable_range[i].end_addr = | |
178 | mc_recoverable_range[i].start_addr + | |
179 | of_read_number(prop + (i * 5) + 2, 1); | |
180 | mc_recoverable_range[i].recover_addr = | |
181 | of_read_number(prop + (i * 5) + 3, 2); | |
182 | ||
183 | pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", | |
184 | mc_recoverable_range[i].start_addr, | |
185 | mc_recoverable_range[i].end_addr, | |
186 | mc_recoverable_range[i].recover_addr); | |
187 | } | |
55672ecf MS |
188 | return 1; |
189 | } | |
190 | ||
c4463b37 JK |
191 | static int __init opal_register_exception_handlers(void) |
192 | { | |
29186097 | 193 | #ifdef __BIG_ENDIAN__ |
c4463b37 JK |
194 | u64 glue; |
195 | ||
196 | if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) | |
197 | return -ENODEV; | |
198 | ||
28446de2 MS |
199 | /* Hookup some exception handlers except machine check. We use the |
200 | * fwnmi area at 0x7000 to provide the glue space to OPAL | |
ed79ba9e BH |
201 | */ |
202 | glue = 0x7000; | |
6507955c MS |
203 | |
204 | /* | |
205 | * Check if we are running on newer firmware that exports | |
206 | * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch | |
207 | * the HMI interrupt and we catch it directly in Linux. | |
208 | * | |
209 | * For older firmware (i.e currently released POWER8 System Firmware | |
210 | * as of today <= SV810_087), we fallback to old behavior and let OPAL | |
211 | * patch the HMI vector and handle it inside OPAL firmware. | |
212 | * | |
213 | * For newer firmware (in development/yet to be released) we will | |
214 | * start catching/handling HMI directly in Linux. | |
215 | */ | |
216 | if (!opal_check_token(OPAL_HANDLE_HMI)) { | |
08135139 | 217 | pr_info("Old firmware detected, OPAL handles HMIs.\n"); |
6507955c MS |
218 | opal_register_exception_handler( |
219 | OPAL_HYPERVISOR_MAINTENANCE_HANDLER, | |
220 | 0, glue); | |
221 | glue += 128; | |
222 | } | |
223 | ||
ed79ba9e | 224 | opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); |
29186097 | 225 | #endif |
ed79ba9e | 226 | |
c4463b37 | 227 | return 0; |
14a43e69 | 228 | } |
b14726c5 | 229 | machine_early_initcall(powernv, opal_register_exception_handlers); |
c4463b37 | 230 | |
24366360 MS |
231 | /* |
232 | * Opal message notifier based on message type. Allow subscribers to get | |
233 | * notified for specific messgae type. | |
234 | */ | |
d7cf83fc | 235 | int opal_message_notifier_register(enum opal_msg_type msg_type, |
24366360 MS |
236 | struct notifier_block *nb) |
237 | { | |
792f96e9 | 238 | if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { |
f2c2cbcc JP |
239 | pr_warn("%s: Invalid arguments, msg_type:%d\n", |
240 | __func__, msg_type); | |
24366360 MS |
241 | return -EINVAL; |
242 | } | |
792f96e9 | 243 | |
24366360 MS |
244 | return atomic_notifier_chain_register( |
245 | &opal_msg_notifier_head[msg_type], nb); | |
246 | } | |
594fcb9e | 247 | EXPORT_SYMBOL_GPL(opal_message_notifier_register); |
24366360 | 248 | |
df60f576 | 249 | int opal_message_notifier_unregister(enum opal_msg_type msg_type, |
b921e902 NG |
250 | struct notifier_block *nb) |
251 | { | |
252 | return atomic_notifier_chain_unregister( | |
253 | &opal_msg_notifier_head[msg_type], nb); | |
254 | } | |
594fcb9e | 255 | EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); |
b921e902 | 256 | |
24366360 MS |
257 | static void opal_message_do_notify(uint32_t msg_type, void *msg) |
258 | { | |
259 | /* notify subscribers */ | |
260 | atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], | |
261 | msg_type, msg); | |
262 | } | |
263 | ||
264 | static void opal_handle_message(void) | |
265 | { | |
266 | s64 ret; | |
267 | /* | |
268 | * TODO: pre-allocate a message buffer depending on opal-msg-size | |
269 | * value in /proc/device-tree. | |
270 | */ | |
271 | static struct opal_msg msg; | |
bb4398e1 | 272 | u32 type; |
24366360 MS |
273 | |
274 | ret = opal_get_msg(__pa(&msg), sizeof(msg)); | |
275 | /* No opal message pending. */ | |
276 | if (ret == OPAL_RESOURCE) | |
277 | return; | |
278 | ||
279 | /* check for errors. */ | |
280 | if (ret) { | |
f2c2cbcc JP |
281 | pr_warn("%s: Failed to retrieve opal message, err=%lld\n", |
282 | __func__, ret); | |
24366360 MS |
283 | return; |
284 | } | |
285 | ||
bb4398e1 AB |
286 | type = be32_to_cpu(msg.msg_type); |
287 | ||
24366360 | 288 | /* Sanity check */ |
792f96e9 | 289 | if (type >= OPAL_MSG_TYPE_MAX) { |
98da62b7 | 290 | pr_warn_once("%s: Unknown message type: %u\n", __func__, type); |
24366360 MS |
291 | return; |
292 | } | |
bb4398e1 | 293 | opal_message_do_notify(type, (void *)&msg); |
24366360 MS |
294 | } |
295 | ||
a295af24 | 296 | static irqreturn_t opal_message_notify(int irq, void *data) |
24366360 | 297 | { |
a295af24 AP |
298 | opal_handle_message(); |
299 | return IRQ_HANDLED; | |
24366360 MS |
300 | } |
301 | ||
24366360 MS |
302 | static int __init opal_message_init(void) |
303 | { | |
a295af24 | 304 | int ret, i, irq; |
24366360 MS |
305 | |
306 | for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) | |
307 | ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); | |
308 | ||
a295af24 AP |
309 | irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); |
310 | if (!irq) { | |
311 | pr_err("%s: Can't register OPAL event irq (%d)\n", | |
312 | __func__, irq); | |
313 | return irq; | |
314 | } | |
315 | ||
316 | ret = request_irq(irq, opal_message_notify, | |
317 | IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); | |
24366360 | 318 | if (ret) { |
a295af24 | 319 | pr_err("%s: Can't request OPAL event irq (%d)\n", |
24366360 MS |
320 | __func__, ret); |
321 | return ret; | |
322 | } | |
a295af24 | 323 | |
24366360 MS |
324 | return 0; |
325 | } | |
24366360 | 326 | |
14a43e69 BH |
327 | int opal_get_chars(uint32_t vtermno, char *buf, int count) |
328 | { | |
4f89363b BH |
329 | s64 rc; |
330 | __be64 evt, len; | |
14a43e69 BH |
331 | |
332 | if (!opal.entry) | |
daea1175 | 333 | return -ENODEV; |
14a43e69 | 334 | opal_poll_events(&evt); |
4f89363b | 335 | if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) |
14a43e69 | 336 | return 0; |
4f89363b | 337 | len = cpu_to_be64(count); |
9d0c4dfe | 338 | rc = opal_console_read(vtermno, &len, buf); |
14a43e69 | 339 | if (rc == OPAL_SUCCESS) |
4f89363b | 340 | return be64_to_cpu(len); |
14a43e69 BH |
341 | return 0; |
342 | } | |
343 | ||
17cc1dd4 | 344 | static int __opal_put_chars(uint32_t vtermno, const char *data, int total_len, bool atomic) |
14a43e69 | 345 | { |
17cc1dd4 | 346 | unsigned long flags = 0 /* shut up gcc */; |
b74d2807 NP |
347 | int written; |
348 | __be64 olen; | |
349 | s64 rc; | |
14a43e69 BH |
350 | |
351 | if (!opal.entry) | |
daea1175 | 352 | return -ENODEV; |
14a43e69 | 353 | |
17cc1dd4 NP |
354 | if (atomic) |
355 | spin_lock_irqsave(&opal_write_lock, flags); | |
e4d54f71 | 356 | rc = opal_console_write_buffer_space(vtermno, &olen); |
b74d2807 | 357 | if (rc || be64_to_cpu(olen) < total_len) { |
e4d54f71 SS |
358 | /* Closed -> drop characters */ |
359 | if (rc) | |
b74d2807 NP |
360 | written = total_len; |
361 | else | |
362 | written = -EAGAIN; | |
363 | goto out; | |
14a43e69 BH |
364 | } |
365 | ||
b74d2807 NP |
366 | /* Should not get a partial write here because space is available. */ |
367 | olen = cpu_to_be64(total_len); | |
368 | rc = opal_console_write(vtermno, &olen, data); | |
369 | if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
95b861a7 | 370 | if (rc == OPAL_BUSY_EVENT) |
b74d2807 | 371 | opal_poll_events(NULL); |
b74d2807 NP |
372 | written = -EAGAIN; |
373 | goto out; | |
374 | } | |
36d2dabc | 375 | |
b74d2807 NP |
376 | /* Closed or other error drop */ |
377 | if (rc != OPAL_SUCCESS) { | |
378 | written = opal_error_code(rc); | |
379 | goto out; | |
380 | } | |
36d2dabc | 381 | |
b74d2807 NP |
382 | written = be64_to_cpu(olen); |
383 | if (written < total_len) { | |
17cc1dd4 NP |
384 | if (atomic) { |
385 | /* Should not happen */ | |
386 | pr_warn("atomic console write returned partial " | |
387 | "len=%d written=%d\n", total_len, written); | |
388 | } | |
b74d2807 NP |
389 | if (!written) |
390 | written = -EAGAIN; | |
d2a2262e | 391 | } |
b74d2807 NP |
392 | |
393 | out: | |
17cc1dd4 NP |
394 | if (atomic) |
395 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
d2a2262e NP |
396 | |
397 | return written; | |
398 | } | |
399 | ||
17cc1dd4 NP |
400 | int opal_put_chars(uint32_t vtermno, const char *data, int total_len) |
401 | { | |
402 | return __opal_put_chars(vtermno, data, total_len, false); | |
403 | } | |
404 | ||
405 | /* | |
406 | * opal_put_chars_atomic will not perform partial-writes. Data will be | |
407 | * atomically written to the terminal or not at all. This is not strictly | |
408 | * true at the moment because console space can race with OPAL's console | |
409 | * writes. | |
410 | */ | |
411 | int opal_put_chars_atomic(uint32_t vtermno, const char *data, int total_len) | |
412 | { | |
413 | return __opal_put_chars(vtermno, data, total_len, true); | |
414 | } | |
415 | ||
95b861a7 | 416 | static s64 __opal_flush_console(uint32_t vtermno) |
d2a2262e NP |
417 | { |
418 | s64 rc; | |
419 | ||
420 | if (!opal_check_token(OPAL_CONSOLE_FLUSH)) { | |
421 | __be64 evt; | |
422 | ||
d2a2262e NP |
423 | /* |
424 | * If OPAL_CONSOLE_FLUSH is not implemented in the firmware, | |
425 | * the console can still be flushed by calling the polling | |
426 | * function while it has OPAL_EVENT_CONSOLE_OUTPUT events. | |
427 | */ | |
95b861a7 NP |
428 | WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n"); |
429 | ||
430 | opal_poll_events(&evt); | |
431 | if (!(be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)) | |
432 | return OPAL_SUCCESS; | |
433 | return OPAL_BUSY; | |
d2a2262e | 434 | |
95b861a7 NP |
435 | } else { |
436 | rc = opal_console_flush(vtermno); | |
437 | if (rc == OPAL_BUSY_EVENT) { | |
438 | opal_poll_events(NULL); | |
439 | rc = OPAL_BUSY; | |
440 | } | |
441 | return rc; | |
14a43e69 | 442 | } |
d2a2262e | 443 | |
95b861a7 NP |
444 | } |
445 | ||
446 | /* | |
447 | * opal_flush_console spins until the console is flushed | |
448 | */ | |
449 | int opal_flush_console(uint32_t vtermno) | |
450 | { | |
451 | for (;;) { | |
452 | s64 rc = __opal_flush_console(vtermno); | |
453 | ||
454 | if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { | |
455 | mdelay(1); | |
456 | continue; | |
457 | } | |
458 | ||
459 | return opal_error_code(rc); | |
460 | } | |
461 | } | |
462 | ||
463 | /* | |
464 | * opal_flush_chars is an hvc interface that sleeps until the console is | |
465 | * flushed if wait, otherwise it will return -EBUSY if the console has data, | |
466 | * -EAGAIN if it has data and some of it was flushed. | |
467 | */ | |
468 | int opal_flush_chars(uint32_t vtermno, bool wait) | |
469 | { | |
470 | for (;;) { | |
471 | s64 rc = __opal_flush_console(vtermno); | |
472 | ||
473 | if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { | |
474 | if (wait) { | |
475 | msleep(OPAL_BUSY_DELAY_MS); | |
476 | continue; | |
d2a2262e | 477 | } |
95b861a7 NP |
478 | if (rc == OPAL_PARTIAL) |
479 | return -EAGAIN; | |
d2a2262e | 480 | } |
d2a2262e | 481 | |
95b861a7 NP |
482 | return opal_error_code(rc); |
483 | } | |
14a43e69 BH |
484 | } |
485 | ||
b63a0ffe MS |
486 | static int opal_recover_mce(struct pt_regs *regs, |
487 | struct machine_check_event *evt) | |
488 | { | |
489 | int recovered = 0; | |
b63a0ffe MS |
490 | |
491 | if (!(regs->msr & MSR_RI)) { | |
492 | /* If MSR_RI isn't set, we cannot recover */ | |
c74dd88e | 493 | pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); |
b63a0ffe MS |
494 | recovered = 0; |
495 | } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { | |
496 | /* Platform corrected itself */ | |
497 | recovered = 1; | |
1363875b NP |
498 | } else if (evt->severity == MCE_SEV_FATAL) { |
499 | /* Fatal machine check */ | |
500 | pr_err("Machine check interrupt is fatal\n"); | |
501 | recovered = 0; | |
6fcd6baa NP |
502 | } |
503 | ||
cda6618d | 504 | if (!recovered && evt->sync_error) { |
b63a0ffe | 505 | /* |
6fcd6baa NP |
506 | * Try to kill processes if we get a synchronous machine check |
507 | * (e.g., one caused by execution of this instruction). This | |
508 | * will devolve into a panic if we try to kill init or are in | |
509 | * an interrupt etc. | |
b63a0ffe MS |
510 | * |
511 | * TODO: Queue up this address for hwpoisioning later. | |
6fcd6baa NP |
512 | * TODO: This is not quite right for d-side machine |
513 | * checks ->nip is not necessarily the important | |
514 | * address. | |
b63a0ffe | 515 | */ |
6fcd6baa NP |
516 | if ((user_mode(regs))) { |
517 | _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); | |
518 | recovered = 1; | |
519 | } else if (die_will_crash()) { | |
520 | /* | |
521 | * die() would kill the kernel, so better to go via | |
522 | * the platform reboot code that will log the | |
523 | * machine check. | |
524 | */ | |
525 | recovered = 0; | |
526 | } else { | |
527 | die("Machine check", regs, SIGBUS); | |
528 | recovered = 1; | |
529 | } | |
b63a0ffe | 530 | } |
6fcd6baa | 531 | |
b63a0ffe MS |
532 | return recovered; |
533 | } | |
534 | ||
62dea077 | 535 | void __noreturn pnv_platform_error_reboot(struct pt_regs *regs, const char *msg) |
b746e3e0 | 536 | { |
35adacd6 NP |
537 | panic_flush_kmsg_start(); |
538 | ||
b746e3e0 NP |
539 | pr_emerg("Hardware platform error: %s\n", msg); |
540 | if (regs) | |
541 | show_regs(regs); | |
542 | smp_send_stop(); | |
35adacd6 NP |
543 | |
544 | panic_flush_kmsg_end(); | |
b746e3e0 NP |
545 | |
546 | /* | |
547 | * Don't bother to shut things down because this will | |
548 | * xstop the system. | |
549 | */ | |
550 | if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg) | |
551 | == OPAL_UNSUPPORTED) { | |
552 | pr_emerg("Reboot type %d not supported for %s\n", | |
553 | OPAL_REBOOT_PLATFORM_ERROR, msg); | |
554 | } | |
555 | ||
556 | /* | |
557 | * We reached here. There can be three possibilities: | |
558 | * 1. We are running on a firmware level that do not support | |
559 | * opal_cec_reboot2() | |
560 | * 2. We are running on a firmware level that do not support | |
561 | * OPAL_REBOOT_PLATFORM_ERROR reboot type. | |
562 | * 3. We are running on FSP based system that does not need | |
563 | * opal to trigger checkstop explicitly for error analysis. | |
564 | * The FSP PRD component would have already got notified | |
565 | * about this error through other channels. | |
5ee573e8 BS |
566 | * 4. We are running on a newer skiboot that by default does |
567 | * not cause a checkstop, drops us back to the kernel to | |
568 | * extract context and state at the time of the error. | |
b746e3e0 NP |
569 | */ |
570 | ||
5ee573e8 | 571 | panic(msg); |
b746e3e0 NP |
572 | } |
573 | ||
ed79ba9e BH |
574 | int opal_machine_check(struct pt_regs *regs) |
575 | { | |
36df96f8 | 576 | struct machine_check_event evt; |
ed79ba9e | 577 | |
36df96f8 MS |
578 | if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) |
579 | return 0; | |
ed79ba9e BH |
580 | |
581 | /* Print things out */ | |
36df96f8 | 582 | if (evt.version != MCE_V1) { |
ed79ba9e BH |
583 | pr_err("Machine Check Exception, Unknown event version %d !\n", |
584 | evt.version); | |
585 | return 0; | |
586 | } | |
c0577201 | 587 | machine_check_print_event_info(&evt, user_mode(regs), false); |
ed79ba9e | 588 | |
b63a0ffe MS |
589 | if (opal_recover_mce(regs, &evt)) |
590 | return 1; | |
e784b649 | 591 | |
b746e3e0 | 592 | pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception"); |
ed79ba9e BH |
593 | } |
594 | ||
0869b6fd MS |
595 | /* Early hmi handler called in real mode. */ |
596 | int opal_hmi_exception_early(struct pt_regs *regs) | |
597 | { | |
0ef95b41 MS |
598 | s64 rc; |
599 | ||
600 | /* | |
601 | * call opal hmi handler. Pass paca address as token. | |
602 | * The return value OPAL_SUCCESS is an indication that there is | |
603 | * an HMI event generated waiting to pull by Linux. | |
604 | */ | |
605 | rc = opal_handle_hmi(); | |
606 | if (rc == OPAL_SUCCESS) { | |
607 | local_paca->hmi_event_available = 1; | |
608 | return 1; | |
609 | } | |
0869b6fd MS |
610 | return 0; |
611 | } | |
612 | ||
de269129 MS |
613 | int opal_hmi_exception_early2(struct pt_regs *regs) |
614 | { | |
615 | s64 rc; | |
616 | __be64 out_flags; | |
617 | ||
618 | /* | |
619 | * call opal hmi handler. | |
620 | * Check 64-bit flag mask to find out if an event was generated, | |
621 | * and whether TB is still valid or not etc. | |
622 | */ | |
623 | rc = opal_handle_hmi2(&out_flags); | |
624 | if (rc != OPAL_SUCCESS) | |
625 | return 0; | |
626 | ||
627 | if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_NEW_EVENT) | |
628 | local_paca->hmi_event_available = 1; | |
629 | if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_TOD_TB_FAIL) | |
630 | tb_invalid = true; | |
631 | return 1; | |
632 | } | |
633 | ||
0869b6fd MS |
634 | /* HMI exception handler called in virtual mode during check_irq_replay. */ |
635 | int opal_handle_hmi_exception(struct pt_regs *regs) | |
636 | { | |
0ef95b41 MS |
637 | /* |
638 | * Check if HMI event is available. | |
56c0b48b | 639 | * if Yes, then wake kopald to process them. |
0ef95b41 MS |
640 | */ |
641 | if (!local_paca->hmi_event_available) | |
642 | return 0; | |
643 | ||
644 | local_paca->hmi_event_available = 0; | |
56c0b48b | 645 | opal_wake_poller(); |
0ef95b41 MS |
646 | |
647 | return 1; | |
0869b6fd MS |
648 | } |
649 | ||
55672ecf MS |
650 | static uint64_t find_recovery_address(uint64_t nip) |
651 | { | |
652 | int i; | |
653 | ||
654 | for (i = 0; i < mc_recoverable_range_len; i++) | |
655 | if ((nip >= mc_recoverable_range[i].start_addr) && | |
656 | (nip < mc_recoverable_range[i].end_addr)) | |
657 | return mc_recoverable_range[i].recover_addr; | |
658 | return 0; | |
659 | } | |
660 | ||
661 | bool opal_mce_check_early_recovery(struct pt_regs *regs) | |
662 | { | |
663 | uint64_t recover_addr = 0; | |
664 | ||
665 | if (!opal.base || !opal.size) | |
666 | goto out; | |
667 | ||
668 | if ((regs->nip >= opal.base) && | |
dc3799bb | 669 | (regs->nip < (opal.base + opal.size))) |
55672ecf MS |
670 | recover_addr = find_recovery_address(regs->nip); |
671 | ||
672 | /* | |
673 | * Setup regs->nip to rfi into fixup address. | |
674 | */ | |
675 | if (recover_addr) | |
676 | regs->nip = recover_addr; | |
677 | ||
678 | out: | |
679 | return !!recover_addr; | |
680 | } | |
681 | ||
6f68b5e2 VH |
682 | static int opal_sysfs_init(void) |
683 | { | |
684 | opal_kobj = kobject_create_and_add("opal", firmware_kobj); | |
685 | if (!opal_kobj) { | |
686 | pr_warn("kobject_create_and_add opal failed\n"); | |
687 | return -ENOMEM; | |
688 | } | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
c8742f85 BH |
693 | static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, |
694 | struct bin_attribute *bin_attr, | |
695 | char *buf, loff_t off, size_t count) | |
696 | { | |
697 | return memory_read_from_buffer(buf, count, &off, bin_attr->private, | |
698 | bin_attr->size); | |
699 | } | |
700 | ||
701 | static BIN_ATTR_RO(symbol_map, 0); | |
702 | ||
703 | static void opal_export_symmap(void) | |
704 | { | |
705 | const __be64 *syms; | |
706 | unsigned int size; | |
707 | struct device_node *fw; | |
708 | int rc; | |
709 | ||
710 | fw = of_find_node_by_path("/ibm,opal/firmware"); | |
711 | if (!fw) | |
712 | return; | |
713 | syms = of_get_property(fw, "symbol-map", &size); | |
714 | if (!syms || size != 2 * sizeof(__be64)) | |
715 | return; | |
716 | ||
717 | /* Setup attributes */ | |
718 | bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); | |
719 | bin_attr_symbol_map.size = be64_to_cpu(syms[1]); | |
720 | ||
721 | rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); | |
722 | if (rc) | |
723 | pr_warn("Error %d creating OPAL symbols file\n", rc); | |
724 | } | |
725 | ||
11fe909d MB |
726 | static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, |
727 | struct bin_attribute *bin_attr, char *buf, | |
728 | loff_t off, size_t count) | |
729 | { | |
730 | return memory_read_from_buffer(buf, count, &off, bin_attr->private, | |
731 | bin_attr->size); | |
732 | } | |
733 | ||
734 | /* | |
735 | * opal_export_attrs: creates a sysfs node for each property listed in | |
736 | * the device-tree under /ibm,opal/firmware/exports/ | |
737 | * All new sysfs nodes are created under /opal/exports/. | |
738 | * This allows for reserved memory regions (e.g. HDAT) to be read. | |
739 | * The new sysfs nodes are only readable by root. | |
740 | */ | |
741 | static void opal_export_attrs(void) | |
742 | { | |
743 | struct bin_attribute *attr; | |
744 | struct device_node *np; | |
745 | struct property *prop; | |
746 | struct kobject *kobj; | |
747 | u64 vals[2]; | |
748 | int rc; | |
749 | ||
750 | np = of_find_node_by_path("/ibm,opal/firmware/exports"); | |
751 | if (!np) | |
752 | return; | |
753 | ||
754 | /* Create new 'exports' directory - /sys/firmware/opal/exports */ | |
755 | kobj = kobject_create_and_add("exports", opal_kobj); | |
756 | if (!kobj) { | |
757 | pr_warn("kobject_create_and_add() of exports failed\n"); | |
758 | return; | |
759 | } | |
760 | ||
761 | for_each_property_of_node(np, prop) { | |
762 | if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) | |
763 | continue; | |
764 | ||
765 | if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) | |
766 | continue; | |
767 | ||
83c49190 | 768 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
11fe909d MB |
769 | |
770 | if (attr == NULL) { | |
771 | pr_warn("Failed kmalloc for bin_attribute!"); | |
772 | continue; | |
773 | } | |
774 | ||
83c49190 | 775 | sysfs_bin_attr_init(attr); |
11fe909d MB |
776 | attr->attr.name = kstrdup(prop->name, GFP_KERNEL); |
777 | attr->attr.mode = 0400; | |
778 | attr->read = export_attr_read; | |
779 | attr->private = __va(vals[0]); | |
780 | attr->size = vals[1]; | |
781 | ||
782 | if (attr->attr.name == NULL) { | |
783 | pr_warn("Failed kstrdup for bin_attribute attr.name"); | |
784 | kfree(attr); | |
785 | continue; | |
786 | } | |
787 | ||
788 | rc = sysfs_create_bin_file(kobj, attr); | |
789 | if (rc) { | |
790 | pr_warn("Error %d creating OPAL sysfs exports/%s file\n", | |
791 | rc, prop->name); | |
792 | kfree(attr->attr.name); | |
793 | kfree(attr); | |
794 | } | |
795 | } | |
796 | ||
797 | of_node_put(np); | |
798 | } | |
799 | ||
b09c2ec4 VH |
800 | static void __init opal_dump_region_init(void) |
801 | { | |
802 | void *addr; | |
803 | uint64_t size; | |
804 | int rc; | |
805 | ||
b962f5a4 SS |
806 | if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) |
807 | return; | |
808 | ||
b09c2ec4 VH |
809 | /* Register kernel log buffer */ |
810 | addr = log_buf_addr_get(); | |
6501ab5e PK |
811 | if (addr == NULL) |
812 | return; | |
813 | ||
b09c2ec4 | 814 | size = log_buf_len_get(); |
6501ab5e PK |
815 | if (size == 0) |
816 | return; | |
817 | ||
b09c2ec4 VH |
818 | rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, |
819 | __pa(addr), size); | |
820 | /* Don't warn if this is just an older OPAL that doesn't | |
821 | * know about that call | |
822 | */ | |
823 | if (rc && rc != OPAL_UNSUPPORTED) | |
824 | pr_warn("DUMP: Failed to register kernel log buffer. " | |
825 | "rc = %d\n", rc); | |
826 | } | |
608b286d | 827 | |
9e4f51bd | 828 | static void opal_pdev_init(const char *compatible) |
ed59190e CB |
829 | { |
830 | struct device_node *np; | |
831 | ||
9e4f51bd | 832 | for_each_compatible_node(np, NULL, compatible) |
47083450 NG |
833 | of_platform_device_create(np, NULL, NULL); |
834 | } | |
835 | ||
8f95faaa MS |
836 | static void __init opal_imc_init_dev(void) |
837 | { | |
838 | struct device_node *np; | |
839 | ||
840 | np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); | |
841 | if (np) | |
842 | of_platform_device_create(np, NULL, NULL); | |
843 | } | |
844 | ||
3bf57561 BH |
845 | static int kopald(void *unused) |
846 | { | |
a203658b | 847 | unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; |
9f0fd049 | 848 | |
3bf57561 BH |
849 | set_freezable(); |
850 | do { | |
851 | try_to_freeze(); | |
56c0b48b NP |
852 | |
853 | opal_handle_events(); | |
854 | ||
855 | set_current_state(TASK_INTERRUPTIBLE); | |
856 | if (opal_have_pending_events()) | |
857 | __set_current_state(TASK_RUNNING); | |
858 | else | |
859 | schedule_timeout(timeout); | |
860 | ||
3bf57561 BH |
861 | } while (!kthread_should_stop()); |
862 | ||
863 | return 0; | |
864 | } | |
865 | ||
a203658b BH |
866 | void opal_wake_poller(void) |
867 | { | |
868 | if (kopald_tsk) | |
869 | wake_up_process(kopald_tsk); | |
870 | } | |
871 | ||
3bf57561 BH |
872 | static void opal_init_heartbeat(void) |
873 | { | |
874 | /* Old firwmware, we assume the HVC heartbeat is sufficient */ | |
875 | if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", | |
876 | &opal_heartbeat) != 0) | |
877 | opal_heartbeat = 0; | |
878 | ||
879 | if (opal_heartbeat) | |
a203658b | 880 | kopald_tsk = kthread_run(kopald, NULL, "kopald"); |
3bf57561 BH |
881 | } |
882 | ||
14a43e69 BH |
883 | static int __init opal_init(void) |
884 | { | |
c159b596 | 885 | struct device_node *np, *consoles, *leds; |
c1c3a526 | 886 | int rc; |
14a43e69 BH |
887 | |
888 | opal_node = of_find_node_by_path("/ibm,opal"); | |
889 | if (!opal_node) { | |
08135139 | 890 | pr_warn("Device node not found\n"); |
14a43e69 BH |
891 | return -ENODEV; |
892 | } | |
2db29d28 BH |
893 | |
894 | /* Register OPAL consoles if any ports */ | |
7261aafc | 895 | consoles = of_find_node_by_path("/ibm,opal/consoles"); |
2db29d28 BH |
896 | if (consoles) { |
897 | for_each_child_of_node(consoles, np) { | |
2c8e65b5 | 898 | if (!of_node_name_eq(np, "serial")) |
2db29d28 BH |
899 | continue; |
900 | of_platform_device_create(np, NULL, NULL); | |
901 | } | |
902 | of_node_put(consoles); | |
14a43e69 | 903 | } |
a125e092 | 904 | |
96e023e7 AP |
905 | /* Initialise OPAL messaging system */ |
906 | opal_message_init(); | |
907 | ||
908 | /* Initialise OPAL asynchronous completion interface */ | |
909 | opal_async_comp_init(); | |
910 | ||
911 | /* Initialise OPAL sensor interface */ | |
912 | opal_sensor_init(); | |
913 | ||
914 | /* Initialise OPAL hypervisor maintainence interrupt handling */ | |
915 | opal_hmi_handler_init(); | |
916 | ||
47083450 | 917 | /* Create i2c platform devices */ |
9e4f51bd | 918 | opal_pdev_init("ibm,opal-i2c"); |
47083450 | 919 | |
3013e173 OH |
920 | /* Handle non-volatile memory devices */ |
921 | opal_pdev_init("pmem-region"); | |
922 | ||
3bf57561 BH |
923 | /* Setup a heatbeat thread if requested by OPAL */ |
924 | opal_init_heartbeat(); | |
925 | ||
8f95faaa MS |
926 | /* Detect In-Memory Collection counters and create devices*/ |
927 | opal_imc_init_dev(); | |
928 | ||
c159b596 VH |
929 | /* Create leds platform devices */ |
930 | leds = of_find_node_by_path("/ibm,opal/leds"); | |
931 | if (leds) { | |
932 | of_platform_device_create(leds, "opal_leds", NULL); | |
933 | of_node_put(leds); | |
934 | } | |
935 | ||
9b4fffa1 AD |
936 | /* Initialise OPAL message log interface */ |
937 | opal_msglog_init(); | |
938 | ||
6f68b5e2 VH |
939 | /* Create "opal" kobject under /sys/firmware */ |
940 | rc = opal_sysfs_init(); | |
50bd6153 | 941 | if (rc == 0) { |
c8742f85 BH |
942 | /* Export symbol map to userspace */ |
943 | opal_export_symmap(); | |
b09c2ec4 VH |
944 | /* Setup dump region interface */ |
945 | opal_dump_region_init(); | |
774fea1a SS |
946 | /* Setup error log interface */ |
947 | rc = opal_elog_init(); | |
50bd6153 | 948 | /* Setup code update interface */ |
ed59190e | 949 | opal_flash_update_init(); |
c7e64b9c SS |
950 | /* Setup platform dump extract interface */ |
951 | opal_platform_dump_init(); | |
4029cd66 NG |
952 | /* Setup system parameters interface */ |
953 | opal_sys_param_init(); | |
9b4fffa1 AD |
954 | /* Setup message log sysfs interface. */ |
955 | opal_msglog_sysfs_init(); | |
50bd6153 | 956 | } |
6f68b5e2 | 957 | |
11fe909d MB |
958 | /* Export all properties */ |
959 | opal_export_attrs(); | |
960 | ||
0d7cd855 | 961 | /* Initialize platform devices: IPMI backend, PRD & flash interface */ |
9e4f51bd JM |
962 | opal_pdev_init("ibm,opal-ipmi"); |
963 | opal_pdev_init("ibm,opal-flash"); | |
964 | opal_pdev_init("ibm,opal-prd"); | |
ed59190e | 965 | |
43a1dd9b | 966 | /* Initialise platform device: oppanel interface */ |
9e4f51bd | 967 | opal_pdev_init("ibm,opal-oppanel"); |
43a1dd9b | 968 | |
affddff6 RC |
969 | /* Initialise OPAL kmsg dumper for flushing console on panic */ |
970 | opal_kmsg_init(); | |
971 | ||
cb8b340d SB |
972 | /* Initialise OPAL powercap interface */ |
973 | opal_powercap_init(); | |
974 | ||
8e84b2d1 SB |
975 | /* Initialise OPAL Power-Shifting-Ratio interface */ |
976 | opal_psr_init(); | |
977 | ||
bf957155 SB |
978 | /* Initialise OPAL sensor groups */ |
979 | opal_sensor_groups_init(); | |
980 | ||
08fb726d MS |
981 | /* Initialise OPAL Power control interface */ |
982 | opal_power_control_init(); | |
983 | ||
14a43e69 BH |
984 | return 0; |
985 | } | |
b14726c5 | 986 | machine_subsys_initcall(powernv, opal_init); |
73ed148a BH |
987 | |
988 | void opal_shutdown(void) | |
989 | { | |
f7d98d18 | 990 | long rc = OPAL_BUSY; |
73ed148a | 991 | |
9f0fd049 | 992 | opal_event_shutdown(); |
f7d98d18 VH |
993 | |
994 | /* | |
995 | * Then sync with OPAL which ensure anything that can | |
996 | * potentially write to our memory has completed such | |
997 | * as an ongoing dump retrieval | |
998 | */ | |
999 | while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
1000 | rc = opal_sync_host_reboot(); | |
1001 | if (rc == OPAL_BUSY) | |
1002 | opal_poll_events(NULL); | |
1003 | else | |
1004 | mdelay(10); | |
1005 | } | |
b09c2ec4 VH |
1006 | |
1007 | /* Unregister memory dump region */ | |
b962f5a4 SS |
1008 | if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) |
1009 | opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); | |
73ed148a | 1010 | } |
e28b05e7 JS |
1011 | |
1012 | /* Export this so that test modules can use it */ | |
1013 | EXPORT_SYMBOL_GPL(opal_invalid_call); | |
594fcb9e JK |
1014 | EXPORT_SYMBOL_GPL(opal_xscom_read); |
1015 | EXPORT_SYMBOL_GPL(opal_xscom_write); | |
608b286d JK |
1016 | EXPORT_SYMBOL_GPL(opal_ipmi_send); |
1017 | EXPORT_SYMBOL_GPL(opal_ipmi_recv); | |
ed59190e CB |
1018 | EXPORT_SYMBOL_GPL(opal_flash_read); |
1019 | EXPORT_SYMBOL_GPL(opal_flash_write); | |
1020 | EXPORT_SYMBOL_GPL(opal_flash_erase); | |
0d7cd855 | 1021 | EXPORT_SYMBOL_GPL(opal_prd_msg); |
6e708000 | 1022 | EXPORT_SYMBOL_GPL(opal_check_token); |
3441f04b AB |
1023 | |
1024 | /* Convert a region of vmalloc memory to an opal sg list */ | |
1025 | struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, | |
1026 | unsigned long vmalloc_size) | |
1027 | { | |
1028 | struct opal_sg_list *sg, *first = NULL; | |
1029 | unsigned long i = 0; | |
1030 | ||
1031 | sg = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
1032 | if (!sg) | |
1033 | goto nomem; | |
1034 | ||
1035 | first = sg; | |
1036 | ||
1037 | while (vmalloc_size > 0) { | |
1038 | uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; | |
1039 | uint64_t length = min(vmalloc_size, PAGE_SIZE); | |
1040 | ||
1041 | sg->entry[i].data = cpu_to_be64(data); | |
1042 | sg->entry[i].length = cpu_to_be64(length); | |
1043 | i++; | |
1044 | ||
1045 | if (i >= SG_ENTRIES_PER_NODE) { | |
1046 | struct opal_sg_list *next; | |
1047 | ||
1048 | next = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
1049 | if (!next) | |
1050 | goto nomem; | |
1051 | ||
1052 | sg->length = cpu_to_be64( | |
1053 | i * sizeof(struct opal_sg_entry) + 16); | |
1054 | i = 0; | |
1055 | sg->next = cpu_to_be64(__pa(next)); | |
1056 | sg = next; | |
1057 | } | |
1058 | ||
1059 | vmalloc_addr += length; | |
1060 | vmalloc_size -= length; | |
1061 | } | |
1062 | ||
1063 | sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); | |
1064 | ||
1065 | return first; | |
1066 | ||
1067 | nomem: | |
1068 | pr_err("%s : Failed to allocate memory\n", __func__); | |
1069 | opal_free_sg_list(first); | |
1070 | return NULL; | |
1071 | } | |
1072 | ||
1073 | void opal_free_sg_list(struct opal_sg_list *sg) | |
1074 | { | |
1075 | while (sg) { | |
1076 | uint64_t next = be64_to_cpu(sg->next); | |
1077 | ||
1078 | kfree(sg); | |
1079 | ||
1080 | if (next) | |
1081 | sg = __va(next); | |
1082 | else | |
1083 | sg = NULL; | |
1084 | } | |
1085 | } | |
16b1d26e | 1086 | |
e3c5c2e0 CLG |
1087 | int opal_error_code(int rc) |
1088 | { | |
1089 | switch (rc) { | |
1090 | case OPAL_SUCCESS: return 0; | |
1091 | ||
1092 | case OPAL_PARAMETER: return -EINVAL; | |
1093 | case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; | |
77adbd22 | 1094 | case OPAL_BUSY: |
e3c5c2e0 CLG |
1095 | case OPAL_BUSY_EVENT: return -EBUSY; |
1096 | case OPAL_NO_MEM: return -ENOMEM; | |
14aae78f | 1097 | case OPAL_PERMISSION: return -EPERM; |
e3c5c2e0 CLG |
1098 | |
1099 | case OPAL_UNSUPPORTED: return -EIO; | |
1100 | case OPAL_HARDWARE: return -EIO; | |
1101 | case OPAL_INTERNAL_ERROR: return -EIO; | |
cb8b340d | 1102 | case OPAL_TIMEOUT: return -ETIMEDOUT; |
e3c5c2e0 CLG |
1103 | default: |
1104 | pr_err("%s: unexpected OPAL error %d\n", __func__, rc); | |
1105 | return -EIO; | |
1106 | } | |
1107 | } | |
1108 | ||
1d0761d2 AP |
1109 | void powernv_set_nmmu_ptcr(unsigned long ptcr) |
1110 | { | |
1111 | int rc; | |
1112 | ||
1113 | if (firmware_has_feature(FW_FEATURE_OPAL)) { | |
1114 | rc = opal_nmmu_set_ptcr(-1UL, ptcr); | |
1115 | if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) | |
1116 | pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); | |
1117 | } | |
1118 | } | |
1119 | ||
16b1d26e NG |
1120 | EXPORT_SYMBOL_GPL(opal_poll_events); |
1121 | EXPORT_SYMBOL_GPL(opal_rtc_read); | |
1122 | EXPORT_SYMBOL_GPL(opal_rtc_write); | |
1123 | EXPORT_SYMBOL_GPL(opal_tpo_read); | |
1124 | EXPORT_SYMBOL_GPL(opal_tpo_write); | |
47083450 | 1125 | EXPORT_SYMBOL_GPL(opal_i2c_request); |
c159b596 VH |
1126 | /* Export these symbols for PowerNV LED class driver */ |
1127 | EXPORT_SYMBOL_GPL(opal_leds_get_ind); | |
1128 | EXPORT_SYMBOL_GPL(opal_leds_set_ind); | |
43a1dd9b SJS |
1129 | /* Export this symbol for PowerNV Operator Panel class driver */ |
1130 | EXPORT_SYMBOL_GPL(opal_write_oppanel_async); | |
ffe6d810 PM |
1131 | /* Export this for KVM */ |
1132 | EXPORT_SYMBOL_GPL(opal_int_set_mfrr); | |
5af50993 | 1133 | EXPORT_SYMBOL_GPL(opal_int_eoi); |
77adbd22 | 1134 | EXPORT_SYMBOL_GPL(opal_error_code); |
656ecc16 HM |
1135 | /* Export the below symbol for NX compression */ |
1136 | EXPORT_SYMBOL(opal_nx_coproc_init); |