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Commit | Line | Data |
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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 | /* | |
1549c42d SS |
205 | * Only ancient OPAL firmware requires this. |
206 | * Specifically, firmware from FW810.00 (released June 2014) | |
207 | * through FW810.20 (Released October 2014). | |
6507955c | 208 | * |
1549c42d SS |
209 | * Check if we are running on newer (post Oct 2014) firmware that |
210 | * exports the OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to | |
211 | * patch the HMI interrupt and we catch it directly in Linux. | |
6507955c | 212 | * |
1549c42d SS |
213 | * For older firmware (i.e < FW810.20), we fallback to old behavior and |
214 | * let OPAL patch the HMI vector and handle it inside OPAL firmware. | |
215 | * | |
216 | * For newer firmware we catch/handle the HMI directly in Linux. | |
6507955c MS |
217 | */ |
218 | if (!opal_check_token(OPAL_HANDLE_HMI)) { | |
08135139 | 219 | pr_info("Old firmware detected, OPAL handles HMIs.\n"); |
6507955c MS |
220 | opal_register_exception_handler( |
221 | OPAL_HYPERVISOR_MAINTENANCE_HANDLER, | |
222 | 0, glue); | |
223 | glue += 128; | |
224 | } | |
225 | ||
1549c42d SS |
226 | /* |
227 | * Only applicable to ancient firmware, all modern | |
228 | * (post March 2015/skiboot 5.0) firmware will just return | |
229 | * OPAL_UNSUPPORTED. | |
230 | */ | |
ed79ba9e | 231 | opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); |
29186097 | 232 | #endif |
ed79ba9e | 233 | |
c4463b37 | 234 | return 0; |
14a43e69 | 235 | } |
b14726c5 | 236 | machine_early_initcall(powernv, opal_register_exception_handlers); |
c4463b37 | 237 | |
24366360 MS |
238 | /* |
239 | * Opal message notifier based on message type. Allow subscribers to get | |
240 | * notified for specific messgae type. | |
241 | */ | |
d7cf83fc | 242 | int opal_message_notifier_register(enum opal_msg_type msg_type, |
24366360 MS |
243 | struct notifier_block *nb) |
244 | { | |
792f96e9 | 245 | if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { |
f2c2cbcc JP |
246 | pr_warn("%s: Invalid arguments, msg_type:%d\n", |
247 | __func__, msg_type); | |
24366360 MS |
248 | return -EINVAL; |
249 | } | |
792f96e9 | 250 | |
24366360 MS |
251 | return atomic_notifier_chain_register( |
252 | &opal_msg_notifier_head[msg_type], nb); | |
253 | } | |
594fcb9e | 254 | EXPORT_SYMBOL_GPL(opal_message_notifier_register); |
24366360 | 255 | |
df60f576 | 256 | int opal_message_notifier_unregister(enum opal_msg_type msg_type, |
b921e902 NG |
257 | struct notifier_block *nb) |
258 | { | |
259 | return atomic_notifier_chain_unregister( | |
260 | &opal_msg_notifier_head[msg_type], nb); | |
261 | } | |
594fcb9e | 262 | EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); |
b921e902 | 263 | |
24366360 MS |
264 | static void opal_message_do_notify(uint32_t msg_type, void *msg) |
265 | { | |
266 | /* notify subscribers */ | |
267 | atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], | |
268 | msg_type, msg); | |
269 | } | |
270 | ||
271 | static void opal_handle_message(void) | |
272 | { | |
273 | s64 ret; | |
274 | /* | |
275 | * TODO: pre-allocate a message buffer depending on opal-msg-size | |
276 | * value in /proc/device-tree. | |
277 | */ | |
278 | static struct opal_msg msg; | |
bb4398e1 | 279 | u32 type; |
24366360 MS |
280 | |
281 | ret = opal_get_msg(__pa(&msg), sizeof(msg)); | |
282 | /* No opal message pending. */ | |
283 | if (ret == OPAL_RESOURCE) | |
284 | return; | |
285 | ||
286 | /* check for errors. */ | |
287 | if (ret) { | |
f2c2cbcc JP |
288 | pr_warn("%s: Failed to retrieve opal message, err=%lld\n", |
289 | __func__, ret); | |
24366360 MS |
290 | return; |
291 | } | |
292 | ||
bb4398e1 AB |
293 | type = be32_to_cpu(msg.msg_type); |
294 | ||
24366360 | 295 | /* Sanity check */ |
792f96e9 | 296 | if (type >= OPAL_MSG_TYPE_MAX) { |
98da62b7 | 297 | pr_warn_once("%s: Unknown message type: %u\n", __func__, type); |
24366360 MS |
298 | return; |
299 | } | |
bb4398e1 | 300 | opal_message_do_notify(type, (void *)&msg); |
24366360 MS |
301 | } |
302 | ||
a295af24 | 303 | static irqreturn_t opal_message_notify(int irq, void *data) |
24366360 | 304 | { |
a295af24 AP |
305 | opal_handle_message(); |
306 | return IRQ_HANDLED; | |
24366360 MS |
307 | } |
308 | ||
24366360 MS |
309 | static int __init opal_message_init(void) |
310 | { | |
a295af24 | 311 | int ret, i, irq; |
24366360 MS |
312 | |
313 | for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) | |
314 | ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); | |
315 | ||
a295af24 AP |
316 | irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); |
317 | if (!irq) { | |
318 | pr_err("%s: Can't register OPAL event irq (%d)\n", | |
319 | __func__, irq); | |
320 | return irq; | |
321 | } | |
322 | ||
323 | ret = request_irq(irq, opal_message_notify, | |
324 | IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); | |
24366360 | 325 | if (ret) { |
a295af24 | 326 | pr_err("%s: Can't request OPAL event irq (%d)\n", |
24366360 MS |
327 | __func__, ret); |
328 | return ret; | |
329 | } | |
a295af24 | 330 | |
24366360 MS |
331 | return 0; |
332 | } | |
24366360 | 333 | |
14a43e69 BH |
334 | int opal_get_chars(uint32_t vtermno, char *buf, int count) |
335 | { | |
4f89363b BH |
336 | s64 rc; |
337 | __be64 evt, len; | |
14a43e69 BH |
338 | |
339 | if (!opal.entry) | |
daea1175 | 340 | return -ENODEV; |
14a43e69 | 341 | opal_poll_events(&evt); |
4f89363b | 342 | if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) |
14a43e69 | 343 | return 0; |
4f89363b | 344 | len = cpu_to_be64(count); |
9d0c4dfe | 345 | rc = opal_console_read(vtermno, &len, buf); |
14a43e69 | 346 | if (rc == OPAL_SUCCESS) |
4f89363b | 347 | return be64_to_cpu(len); |
14a43e69 BH |
348 | return 0; |
349 | } | |
350 | ||
17cc1dd4 | 351 | static int __opal_put_chars(uint32_t vtermno, const char *data, int total_len, bool atomic) |
14a43e69 | 352 | { |
17cc1dd4 | 353 | unsigned long flags = 0 /* shut up gcc */; |
b74d2807 NP |
354 | int written; |
355 | __be64 olen; | |
356 | s64 rc; | |
14a43e69 BH |
357 | |
358 | if (!opal.entry) | |
daea1175 | 359 | return -ENODEV; |
14a43e69 | 360 | |
17cc1dd4 NP |
361 | if (atomic) |
362 | spin_lock_irqsave(&opal_write_lock, flags); | |
e4d54f71 | 363 | rc = opal_console_write_buffer_space(vtermno, &olen); |
b74d2807 | 364 | if (rc || be64_to_cpu(olen) < total_len) { |
e4d54f71 SS |
365 | /* Closed -> drop characters */ |
366 | if (rc) | |
b74d2807 NP |
367 | written = total_len; |
368 | else | |
369 | written = -EAGAIN; | |
370 | goto out; | |
14a43e69 BH |
371 | } |
372 | ||
b74d2807 NP |
373 | /* Should not get a partial write here because space is available. */ |
374 | olen = cpu_to_be64(total_len); | |
375 | rc = opal_console_write(vtermno, &olen, data); | |
376 | if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
95b861a7 | 377 | if (rc == OPAL_BUSY_EVENT) |
b74d2807 | 378 | opal_poll_events(NULL); |
b74d2807 NP |
379 | written = -EAGAIN; |
380 | goto out; | |
381 | } | |
36d2dabc | 382 | |
b74d2807 NP |
383 | /* Closed or other error drop */ |
384 | if (rc != OPAL_SUCCESS) { | |
385 | written = opal_error_code(rc); | |
386 | goto out; | |
387 | } | |
36d2dabc | 388 | |
b74d2807 NP |
389 | written = be64_to_cpu(olen); |
390 | if (written < total_len) { | |
17cc1dd4 NP |
391 | if (atomic) { |
392 | /* Should not happen */ | |
393 | pr_warn("atomic console write returned partial " | |
394 | "len=%d written=%d\n", total_len, written); | |
395 | } | |
b74d2807 NP |
396 | if (!written) |
397 | written = -EAGAIN; | |
d2a2262e | 398 | } |
b74d2807 NP |
399 | |
400 | out: | |
17cc1dd4 NP |
401 | if (atomic) |
402 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
d2a2262e NP |
403 | |
404 | return written; | |
405 | } | |
406 | ||
17cc1dd4 NP |
407 | int opal_put_chars(uint32_t vtermno, const char *data, int total_len) |
408 | { | |
409 | return __opal_put_chars(vtermno, data, total_len, false); | |
410 | } | |
411 | ||
412 | /* | |
413 | * opal_put_chars_atomic will not perform partial-writes. Data will be | |
414 | * atomically written to the terminal or not at all. This is not strictly | |
415 | * true at the moment because console space can race with OPAL's console | |
416 | * writes. | |
417 | */ | |
418 | int opal_put_chars_atomic(uint32_t vtermno, const char *data, int total_len) | |
419 | { | |
420 | return __opal_put_chars(vtermno, data, total_len, true); | |
421 | } | |
422 | ||
95b861a7 | 423 | static s64 __opal_flush_console(uint32_t vtermno) |
d2a2262e NP |
424 | { |
425 | s64 rc; | |
426 | ||
427 | if (!opal_check_token(OPAL_CONSOLE_FLUSH)) { | |
428 | __be64 evt; | |
429 | ||
d2a2262e NP |
430 | /* |
431 | * If OPAL_CONSOLE_FLUSH is not implemented in the firmware, | |
432 | * the console can still be flushed by calling the polling | |
433 | * function while it has OPAL_EVENT_CONSOLE_OUTPUT events. | |
434 | */ | |
95b861a7 NP |
435 | WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n"); |
436 | ||
437 | opal_poll_events(&evt); | |
438 | if (!(be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)) | |
439 | return OPAL_SUCCESS; | |
440 | return OPAL_BUSY; | |
d2a2262e | 441 | |
95b861a7 NP |
442 | } else { |
443 | rc = opal_console_flush(vtermno); | |
444 | if (rc == OPAL_BUSY_EVENT) { | |
445 | opal_poll_events(NULL); | |
446 | rc = OPAL_BUSY; | |
447 | } | |
448 | return rc; | |
14a43e69 | 449 | } |
d2a2262e | 450 | |
95b861a7 NP |
451 | } |
452 | ||
453 | /* | |
454 | * opal_flush_console spins until the console is flushed | |
455 | */ | |
456 | int opal_flush_console(uint32_t vtermno) | |
457 | { | |
458 | for (;;) { | |
459 | s64 rc = __opal_flush_console(vtermno); | |
460 | ||
461 | if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { | |
462 | mdelay(1); | |
463 | continue; | |
464 | } | |
465 | ||
466 | return opal_error_code(rc); | |
467 | } | |
468 | } | |
469 | ||
470 | /* | |
471 | * opal_flush_chars is an hvc interface that sleeps until the console is | |
472 | * flushed if wait, otherwise it will return -EBUSY if the console has data, | |
473 | * -EAGAIN if it has data and some of it was flushed. | |
474 | */ | |
475 | int opal_flush_chars(uint32_t vtermno, bool wait) | |
476 | { | |
477 | for (;;) { | |
478 | s64 rc = __opal_flush_console(vtermno); | |
479 | ||
480 | if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { | |
481 | if (wait) { | |
482 | msleep(OPAL_BUSY_DELAY_MS); | |
483 | continue; | |
d2a2262e | 484 | } |
95b861a7 NP |
485 | if (rc == OPAL_PARTIAL) |
486 | return -EAGAIN; | |
d2a2262e | 487 | } |
d2a2262e | 488 | |
95b861a7 NP |
489 | return opal_error_code(rc); |
490 | } | |
14a43e69 BH |
491 | } |
492 | ||
b63a0ffe MS |
493 | static int opal_recover_mce(struct pt_regs *regs, |
494 | struct machine_check_event *evt) | |
495 | { | |
496 | int recovered = 0; | |
b63a0ffe MS |
497 | |
498 | if (!(regs->msr & MSR_RI)) { | |
499 | /* If MSR_RI isn't set, we cannot recover */ | |
c74dd88e | 500 | pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); |
b63a0ffe MS |
501 | recovered = 0; |
502 | } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { | |
503 | /* Platform corrected itself */ | |
504 | recovered = 1; | |
1363875b NP |
505 | } else if (evt->severity == MCE_SEV_FATAL) { |
506 | /* Fatal machine check */ | |
507 | pr_err("Machine check interrupt is fatal\n"); | |
508 | recovered = 0; | |
6fcd6baa NP |
509 | } |
510 | ||
cda6618d | 511 | if (!recovered && evt->sync_error) { |
b63a0ffe | 512 | /* |
6fcd6baa NP |
513 | * Try to kill processes if we get a synchronous machine check |
514 | * (e.g., one caused by execution of this instruction). This | |
515 | * will devolve into a panic if we try to kill init or are in | |
516 | * an interrupt etc. | |
b63a0ffe MS |
517 | * |
518 | * TODO: Queue up this address for hwpoisioning later. | |
6fcd6baa NP |
519 | * TODO: This is not quite right for d-side machine |
520 | * checks ->nip is not necessarily the important | |
521 | * address. | |
b63a0ffe | 522 | */ |
6fcd6baa NP |
523 | if ((user_mode(regs))) { |
524 | _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); | |
525 | recovered = 1; | |
526 | } else if (die_will_crash()) { | |
527 | /* | |
528 | * die() would kill the kernel, so better to go via | |
529 | * the platform reboot code that will log the | |
530 | * machine check. | |
531 | */ | |
532 | recovered = 0; | |
533 | } else { | |
534 | die("Machine check", regs, SIGBUS); | |
535 | recovered = 1; | |
536 | } | |
b63a0ffe | 537 | } |
6fcd6baa | 538 | |
b63a0ffe MS |
539 | return recovered; |
540 | } | |
541 | ||
62dea077 | 542 | void __noreturn pnv_platform_error_reboot(struct pt_regs *regs, const char *msg) |
b746e3e0 | 543 | { |
35adacd6 NP |
544 | panic_flush_kmsg_start(); |
545 | ||
b746e3e0 NP |
546 | pr_emerg("Hardware platform error: %s\n", msg); |
547 | if (regs) | |
548 | show_regs(regs); | |
549 | smp_send_stop(); | |
35adacd6 NP |
550 | |
551 | panic_flush_kmsg_end(); | |
b746e3e0 NP |
552 | |
553 | /* | |
554 | * Don't bother to shut things down because this will | |
555 | * xstop the system. | |
556 | */ | |
557 | if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg) | |
558 | == OPAL_UNSUPPORTED) { | |
559 | pr_emerg("Reboot type %d not supported for %s\n", | |
560 | OPAL_REBOOT_PLATFORM_ERROR, msg); | |
561 | } | |
562 | ||
563 | /* | |
564 | * We reached here. There can be three possibilities: | |
565 | * 1. We are running on a firmware level that do not support | |
566 | * opal_cec_reboot2() | |
567 | * 2. We are running on a firmware level that do not support | |
568 | * OPAL_REBOOT_PLATFORM_ERROR reboot type. | |
569 | * 3. We are running on FSP based system that does not need | |
570 | * opal to trigger checkstop explicitly for error analysis. | |
571 | * The FSP PRD component would have already got notified | |
572 | * about this error through other channels. | |
5ee573e8 BS |
573 | * 4. We are running on a newer skiboot that by default does |
574 | * not cause a checkstop, drops us back to the kernel to | |
575 | * extract context and state at the time of the error. | |
b746e3e0 NP |
576 | */ |
577 | ||
5ee573e8 | 578 | panic(msg); |
b746e3e0 NP |
579 | } |
580 | ||
ed79ba9e BH |
581 | int opal_machine_check(struct pt_regs *regs) |
582 | { | |
36df96f8 | 583 | struct machine_check_event evt; |
ed79ba9e | 584 | |
36df96f8 MS |
585 | if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) |
586 | return 0; | |
ed79ba9e BH |
587 | |
588 | /* Print things out */ | |
36df96f8 | 589 | if (evt.version != MCE_V1) { |
ed79ba9e BH |
590 | pr_err("Machine Check Exception, Unknown event version %d !\n", |
591 | evt.version); | |
592 | return 0; | |
593 | } | |
c0577201 | 594 | machine_check_print_event_info(&evt, user_mode(regs), false); |
ed79ba9e | 595 | |
b63a0ffe MS |
596 | if (opal_recover_mce(regs, &evt)) |
597 | return 1; | |
e784b649 | 598 | |
b746e3e0 | 599 | pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception"); |
ed79ba9e BH |
600 | } |
601 | ||
0869b6fd MS |
602 | /* Early hmi handler called in real mode. */ |
603 | int opal_hmi_exception_early(struct pt_regs *regs) | |
604 | { | |
0ef95b41 MS |
605 | s64 rc; |
606 | ||
607 | /* | |
608 | * call opal hmi handler. Pass paca address as token. | |
609 | * The return value OPAL_SUCCESS is an indication that there is | |
610 | * an HMI event generated waiting to pull by Linux. | |
611 | */ | |
612 | rc = opal_handle_hmi(); | |
613 | if (rc == OPAL_SUCCESS) { | |
614 | local_paca->hmi_event_available = 1; | |
615 | return 1; | |
616 | } | |
0869b6fd MS |
617 | return 0; |
618 | } | |
619 | ||
de269129 MS |
620 | int opal_hmi_exception_early2(struct pt_regs *regs) |
621 | { | |
622 | s64 rc; | |
623 | __be64 out_flags; | |
624 | ||
625 | /* | |
626 | * call opal hmi handler. | |
627 | * Check 64-bit flag mask to find out if an event was generated, | |
628 | * and whether TB is still valid or not etc. | |
629 | */ | |
630 | rc = opal_handle_hmi2(&out_flags); | |
631 | if (rc != OPAL_SUCCESS) | |
632 | return 0; | |
633 | ||
634 | if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_NEW_EVENT) | |
635 | local_paca->hmi_event_available = 1; | |
636 | if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_TOD_TB_FAIL) | |
637 | tb_invalid = true; | |
638 | return 1; | |
639 | } | |
640 | ||
0869b6fd MS |
641 | /* HMI exception handler called in virtual mode during check_irq_replay. */ |
642 | int opal_handle_hmi_exception(struct pt_regs *regs) | |
643 | { | |
0ef95b41 MS |
644 | /* |
645 | * Check if HMI event is available. | |
56c0b48b | 646 | * if Yes, then wake kopald to process them. |
0ef95b41 MS |
647 | */ |
648 | if (!local_paca->hmi_event_available) | |
649 | return 0; | |
650 | ||
651 | local_paca->hmi_event_available = 0; | |
56c0b48b | 652 | opal_wake_poller(); |
0ef95b41 MS |
653 | |
654 | return 1; | |
0869b6fd MS |
655 | } |
656 | ||
55672ecf MS |
657 | static uint64_t find_recovery_address(uint64_t nip) |
658 | { | |
659 | int i; | |
660 | ||
661 | for (i = 0; i < mc_recoverable_range_len; i++) | |
662 | if ((nip >= mc_recoverable_range[i].start_addr) && | |
663 | (nip < mc_recoverable_range[i].end_addr)) | |
664 | return mc_recoverable_range[i].recover_addr; | |
665 | return 0; | |
666 | } | |
667 | ||
668 | bool opal_mce_check_early_recovery(struct pt_regs *regs) | |
669 | { | |
670 | uint64_t recover_addr = 0; | |
671 | ||
672 | if (!opal.base || !opal.size) | |
673 | goto out; | |
674 | ||
675 | if ((regs->nip >= opal.base) && | |
dc3799bb | 676 | (regs->nip < (opal.base + opal.size))) |
55672ecf MS |
677 | recover_addr = find_recovery_address(regs->nip); |
678 | ||
679 | /* | |
680 | * Setup regs->nip to rfi into fixup address. | |
681 | */ | |
682 | if (recover_addr) | |
683 | regs->nip = recover_addr; | |
684 | ||
685 | out: | |
686 | return !!recover_addr; | |
687 | } | |
688 | ||
6f68b5e2 VH |
689 | static int opal_sysfs_init(void) |
690 | { | |
691 | opal_kobj = kobject_create_and_add("opal", firmware_kobj); | |
692 | if (!opal_kobj) { | |
693 | pr_warn("kobject_create_and_add opal failed\n"); | |
694 | return -ENOMEM; | |
695 | } | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
c8742f85 BH |
700 | static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, |
701 | struct bin_attribute *bin_attr, | |
702 | char *buf, loff_t off, size_t count) | |
703 | { | |
704 | return memory_read_from_buffer(buf, count, &off, bin_attr->private, | |
705 | bin_attr->size); | |
706 | } | |
707 | ||
ea66b673 AD |
708 | static struct bin_attribute symbol_map_attr = { |
709 | .attr = {.name = "symbol_map", .mode = 0400}, | |
710 | .read = symbol_map_read | |
711 | }; | |
c8742f85 BH |
712 | |
713 | static void opal_export_symmap(void) | |
714 | { | |
715 | const __be64 *syms; | |
716 | unsigned int size; | |
717 | struct device_node *fw; | |
718 | int rc; | |
719 | ||
720 | fw = of_find_node_by_path("/ibm,opal/firmware"); | |
721 | if (!fw) | |
722 | return; | |
723 | syms = of_get_property(fw, "symbol-map", &size); | |
724 | if (!syms || size != 2 * sizeof(__be64)) | |
725 | return; | |
726 | ||
727 | /* Setup attributes */ | |
ea66b673 AD |
728 | symbol_map_attr.private = __va(be64_to_cpu(syms[0])); |
729 | symbol_map_attr.size = be64_to_cpu(syms[1]); | |
c8742f85 | 730 | |
ea66b673 | 731 | rc = sysfs_create_bin_file(opal_kobj, &symbol_map_attr); |
c8742f85 BH |
732 | if (rc) |
733 | pr_warn("Error %d creating OPAL symbols file\n", rc); | |
734 | } | |
735 | ||
11fe909d MB |
736 | static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, |
737 | struct bin_attribute *bin_attr, char *buf, | |
738 | loff_t off, size_t count) | |
739 | { | |
740 | return memory_read_from_buffer(buf, count, &off, bin_attr->private, | |
741 | bin_attr->size); | |
742 | } | |
743 | ||
744 | /* | |
745 | * opal_export_attrs: creates a sysfs node for each property listed in | |
746 | * the device-tree under /ibm,opal/firmware/exports/ | |
747 | * All new sysfs nodes are created under /opal/exports/. | |
748 | * This allows for reserved memory regions (e.g. HDAT) to be read. | |
749 | * The new sysfs nodes are only readable by root. | |
750 | */ | |
751 | static void opal_export_attrs(void) | |
752 | { | |
753 | struct bin_attribute *attr; | |
754 | struct device_node *np; | |
755 | struct property *prop; | |
756 | struct kobject *kobj; | |
757 | u64 vals[2]; | |
758 | int rc; | |
759 | ||
760 | np = of_find_node_by_path("/ibm,opal/firmware/exports"); | |
761 | if (!np) | |
762 | return; | |
763 | ||
764 | /* Create new 'exports' directory - /sys/firmware/opal/exports */ | |
765 | kobj = kobject_create_and_add("exports", opal_kobj); | |
766 | if (!kobj) { | |
767 | pr_warn("kobject_create_and_add() of exports failed\n"); | |
768 | return; | |
769 | } | |
770 | ||
771 | for_each_property_of_node(np, prop) { | |
772 | if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) | |
773 | continue; | |
774 | ||
775 | if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) | |
776 | continue; | |
777 | ||
83c49190 | 778 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
11fe909d MB |
779 | |
780 | if (attr == NULL) { | |
781 | pr_warn("Failed kmalloc for bin_attribute!"); | |
782 | continue; | |
783 | } | |
784 | ||
83c49190 | 785 | sysfs_bin_attr_init(attr); |
11fe909d MB |
786 | attr->attr.name = kstrdup(prop->name, GFP_KERNEL); |
787 | attr->attr.mode = 0400; | |
788 | attr->read = export_attr_read; | |
789 | attr->private = __va(vals[0]); | |
790 | attr->size = vals[1]; | |
791 | ||
792 | if (attr->attr.name == NULL) { | |
793 | pr_warn("Failed kstrdup for bin_attribute attr.name"); | |
794 | kfree(attr); | |
795 | continue; | |
796 | } | |
797 | ||
798 | rc = sysfs_create_bin_file(kobj, attr); | |
799 | if (rc) { | |
800 | pr_warn("Error %d creating OPAL sysfs exports/%s file\n", | |
801 | rc, prop->name); | |
802 | kfree(attr->attr.name); | |
803 | kfree(attr); | |
804 | } | |
805 | } | |
806 | ||
807 | of_node_put(np); | |
808 | } | |
809 | ||
b09c2ec4 VH |
810 | static void __init opal_dump_region_init(void) |
811 | { | |
812 | void *addr; | |
813 | uint64_t size; | |
814 | int rc; | |
815 | ||
b962f5a4 SS |
816 | if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) |
817 | return; | |
818 | ||
b09c2ec4 VH |
819 | /* Register kernel log buffer */ |
820 | addr = log_buf_addr_get(); | |
6501ab5e PK |
821 | if (addr == NULL) |
822 | return; | |
823 | ||
b09c2ec4 | 824 | size = log_buf_len_get(); |
6501ab5e PK |
825 | if (size == 0) |
826 | return; | |
827 | ||
b09c2ec4 VH |
828 | rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, |
829 | __pa(addr), size); | |
830 | /* Don't warn if this is just an older OPAL that doesn't | |
831 | * know about that call | |
832 | */ | |
833 | if (rc && rc != OPAL_UNSUPPORTED) | |
834 | pr_warn("DUMP: Failed to register kernel log buffer. " | |
835 | "rc = %d\n", rc); | |
836 | } | |
608b286d | 837 | |
9e4f51bd | 838 | static void opal_pdev_init(const char *compatible) |
ed59190e CB |
839 | { |
840 | struct device_node *np; | |
841 | ||
9e4f51bd | 842 | for_each_compatible_node(np, NULL, compatible) |
47083450 NG |
843 | of_platform_device_create(np, NULL, NULL); |
844 | } | |
845 | ||
8f95faaa MS |
846 | static void __init opal_imc_init_dev(void) |
847 | { | |
848 | struct device_node *np; | |
849 | ||
850 | np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); | |
851 | if (np) | |
852 | of_platform_device_create(np, NULL, NULL); | |
853 | } | |
854 | ||
3bf57561 BH |
855 | static int kopald(void *unused) |
856 | { | |
a203658b | 857 | unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; |
9f0fd049 | 858 | |
3bf57561 BH |
859 | set_freezable(); |
860 | do { | |
861 | try_to_freeze(); | |
56c0b48b NP |
862 | |
863 | opal_handle_events(); | |
864 | ||
865 | set_current_state(TASK_INTERRUPTIBLE); | |
866 | if (opal_have_pending_events()) | |
867 | __set_current_state(TASK_RUNNING); | |
868 | else | |
869 | schedule_timeout(timeout); | |
870 | ||
3bf57561 BH |
871 | } while (!kthread_should_stop()); |
872 | ||
873 | return 0; | |
874 | } | |
875 | ||
a203658b BH |
876 | void opal_wake_poller(void) |
877 | { | |
878 | if (kopald_tsk) | |
879 | wake_up_process(kopald_tsk); | |
880 | } | |
881 | ||
3bf57561 BH |
882 | static void opal_init_heartbeat(void) |
883 | { | |
884 | /* Old firwmware, we assume the HVC heartbeat is sufficient */ | |
885 | if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", | |
886 | &opal_heartbeat) != 0) | |
887 | opal_heartbeat = 0; | |
888 | ||
889 | if (opal_heartbeat) | |
a203658b | 890 | kopald_tsk = kthread_run(kopald, NULL, "kopald"); |
3bf57561 BH |
891 | } |
892 | ||
14a43e69 BH |
893 | static int __init opal_init(void) |
894 | { | |
c159b596 | 895 | struct device_node *np, *consoles, *leds; |
c1c3a526 | 896 | int rc; |
14a43e69 BH |
897 | |
898 | opal_node = of_find_node_by_path("/ibm,opal"); | |
899 | if (!opal_node) { | |
08135139 | 900 | pr_warn("Device node not found\n"); |
14a43e69 BH |
901 | return -ENODEV; |
902 | } | |
2db29d28 BH |
903 | |
904 | /* Register OPAL consoles if any ports */ | |
7261aafc | 905 | consoles = of_find_node_by_path("/ibm,opal/consoles"); |
2db29d28 BH |
906 | if (consoles) { |
907 | for_each_child_of_node(consoles, np) { | |
2c8e65b5 | 908 | if (!of_node_name_eq(np, "serial")) |
2db29d28 BH |
909 | continue; |
910 | of_platform_device_create(np, NULL, NULL); | |
911 | } | |
912 | of_node_put(consoles); | |
14a43e69 | 913 | } |
a125e092 | 914 | |
96e023e7 AP |
915 | /* Initialise OPAL messaging system */ |
916 | opal_message_init(); | |
917 | ||
918 | /* Initialise OPAL asynchronous completion interface */ | |
919 | opal_async_comp_init(); | |
920 | ||
921 | /* Initialise OPAL sensor interface */ | |
922 | opal_sensor_init(); | |
923 | ||
924 | /* Initialise OPAL hypervisor maintainence interrupt handling */ | |
925 | opal_hmi_handler_init(); | |
926 | ||
47083450 | 927 | /* Create i2c platform devices */ |
9e4f51bd | 928 | opal_pdev_init("ibm,opal-i2c"); |
47083450 | 929 | |
3013e173 OH |
930 | /* Handle non-volatile memory devices */ |
931 | opal_pdev_init("pmem-region"); | |
932 | ||
3bf57561 BH |
933 | /* Setup a heatbeat thread if requested by OPAL */ |
934 | opal_init_heartbeat(); | |
935 | ||
8f95faaa MS |
936 | /* Detect In-Memory Collection counters and create devices*/ |
937 | opal_imc_init_dev(); | |
938 | ||
c159b596 VH |
939 | /* Create leds platform devices */ |
940 | leds = of_find_node_by_path("/ibm,opal/leds"); | |
941 | if (leds) { | |
942 | of_platform_device_create(leds, "opal_leds", NULL); | |
943 | of_node_put(leds); | |
944 | } | |
945 | ||
9b4fffa1 AD |
946 | /* Initialise OPAL message log interface */ |
947 | opal_msglog_init(); | |
948 | ||
6f68b5e2 VH |
949 | /* Create "opal" kobject under /sys/firmware */ |
950 | rc = opal_sysfs_init(); | |
50bd6153 | 951 | if (rc == 0) { |
c8742f85 BH |
952 | /* Export symbol map to userspace */ |
953 | opal_export_symmap(); | |
b09c2ec4 VH |
954 | /* Setup dump region interface */ |
955 | opal_dump_region_init(); | |
774fea1a SS |
956 | /* Setup error log interface */ |
957 | rc = opal_elog_init(); | |
50bd6153 | 958 | /* Setup code update interface */ |
ed59190e | 959 | opal_flash_update_init(); |
c7e64b9c SS |
960 | /* Setup platform dump extract interface */ |
961 | opal_platform_dump_init(); | |
4029cd66 NG |
962 | /* Setup system parameters interface */ |
963 | opal_sys_param_init(); | |
9b4fffa1 AD |
964 | /* Setup message log sysfs interface. */ |
965 | opal_msglog_sysfs_init(); | |
50bd6153 | 966 | } |
6f68b5e2 | 967 | |
11fe909d MB |
968 | /* Export all properties */ |
969 | opal_export_attrs(); | |
970 | ||
0d7cd855 | 971 | /* Initialize platform devices: IPMI backend, PRD & flash interface */ |
9e4f51bd JM |
972 | opal_pdev_init("ibm,opal-ipmi"); |
973 | opal_pdev_init("ibm,opal-flash"); | |
974 | opal_pdev_init("ibm,opal-prd"); | |
ed59190e | 975 | |
43a1dd9b | 976 | /* Initialise platform device: oppanel interface */ |
9e4f51bd | 977 | opal_pdev_init("ibm,opal-oppanel"); |
43a1dd9b | 978 | |
affddff6 RC |
979 | /* Initialise OPAL kmsg dumper for flushing console on panic */ |
980 | opal_kmsg_init(); | |
981 | ||
cb8b340d SB |
982 | /* Initialise OPAL powercap interface */ |
983 | opal_powercap_init(); | |
984 | ||
8e84b2d1 SB |
985 | /* Initialise OPAL Power-Shifting-Ratio interface */ |
986 | opal_psr_init(); | |
987 | ||
bf957155 SB |
988 | /* Initialise OPAL sensor groups */ |
989 | opal_sensor_groups_init(); | |
990 | ||
08fb726d MS |
991 | /* Initialise OPAL Power control interface */ |
992 | opal_power_control_init(); | |
993 | ||
14a43e69 BH |
994 | return 0; |
995 | } | |
b14726c5 | 996 | machine_subsys_initcall(powernv, opal_init); |
73ed148a BH |
997 | |
998 | void opal_shutdown(void) | |
999 | { | |
f7d98d18 | 1000 | long rc = OPAL_BUSY; |
73ed148a | 1001 | |
9f0fd049 | 1002 | opal_event_shutdown(); |
f7d98d18 VH |
1003 | |
1004 | /* | |
1005 | * Then sync with OPAL which ensure anything that can | |
1006 | * potentially write to our memory has completed such | |
1007 | * as an ongoing dump retrieval | |
1008 | */ | |
1009 | while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { | |
1010 | rc = opal_sync_host_reboot(); | |
1011 | if (rc == OPAL_BUSY) | |
1012 | opal_poll_events(NULL); | |
1013 | else | |
1014 | mdelay(10); | |
1015 | } | |
b09c2ec4 VH |
1016 | |
1017 | /* Unregister memory dump region */ | |
b962f5a4 SS |
1018 | if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) |
1019 | opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); | |
73ed148a | 1020 | } |
e28b05e7 JS |
1021 | |
1022 | /* Export this so that test modules can use it */ | |
1023 | EXPORT_SYMBOL_GPL(opal_invalid_call); | |
594fcb9e JK |
1024 | EXPORT_SYMBOL_GPL(opal_xscom_read); |
1025 | EXPORT_SYMBOL_GPL(opal_xscom_write); | |
608b286d JK |
1026 | EXPORT_SYMBOL_GPL(opal_ipmi_send); |
1027 | EXPORT_SYMBOL_GPL(opal_ipmi_recv); | |
ed59190e CB |
1028 | EXPORT_SYMBOL_GPL(opal_flash_read); |
1029 | EXPORT_SYMBOL_GPL(opal_flash_write); | |
1030 | EXPORT_SYMBOL_GPL(opal_flash_erase); | |
0d7cd855 | 1031 | EXPORT_SYMBOL_GPL(opal_prd_msg); |
6e708000 | 1032 | EXPORT_SYMBOL_GPL(opal_check_token); |
3441f04b AB |
1033 | |
1034 | /* Convert a region of vmalloc memory to an opal sg list */ | |
1035 | struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, | |
1036 | unsigned long vmalloc_size) | |
1037 | { | |
1038 | struct opal_sg_list *sg, *first = NULL; | |
1039 | unsigned long i = 0; | |
1040 | ||
1041 | sg = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
1042 | if (!sg) | |
1043 | goto nomem; | |
1044 | ||
1045 | first = sg; | |
1046 | ||
1047 | while (vmalloc_size > 0) { | |
1048 | uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; | |
1049 | uint64_t length = min(vmalloc_size, PAGE_SIZE); | |
1050 | ||
1051 | sg->entry[i].data = cpu_to_be64(data); | |
1052 | sg->entry[i].length = cpu_to_be64(length); | |
1053 | i++; | |
1054 | ||
1055 | if (i >= SG_ENTRIES_PER_NODE) { | |
1056 | struct opal_sg_list *next; | |
1057 | ||
1058 | next = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
1059 | if (!next) | |
1060 | goto nomem; | |
1061 | ||
1062 | sg->length = cpu_to_be64( | |
1063 | i * sizeof(struct opal_sg_entry) + 16); | |
1064 | i = 0; | |
1065 | sg->next = cpu_to_be64(__pa(next)); | |
1066 | sg = next; | |
1067 | } | |
1068 | ||
1069 | vmalloc_addr += length; | |
1070 | vmalloc_size -= length; | |
1071 | } | |
1072 | ||
1073 | sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); | |
1074 | ||
1075 | return first; | |
1076 | ||
1077 | nomem: | |
1078 | pr_err("%s : Failed to allocate memory\n", __func__); | |
1079 | opal_free_sg_list(first); | |
1080 | return NULL; | |
1081 | } | |
1082 | ||
1083 | void opal_free_sg_list(struct opal_sg_list *sg) | |
1084 | { | |
1085 | while (sg) { | |
1086 | uint64_t next = be64_to_cpu(sg->next); | |
1087 | ||
1088 | kfree(sg); | |
1089 | ||
1090 | if (next) | |
1091 | sg = __va(next); | |
1092 | else | |
1093 | sg = NULL; | |
1094 | } | |
1095 | } | |
16b1d26e | 1096 | |
e3c5c2e0 CLG |
1097 | int opal_error_code(int rc) |
1098 | { | |
1099 | switch (rc) { | |
1100 | case OPAL_SUCCESS: return 0; | |
1101 | ||
1102 | case OPAL_PARAMETER: return -EINVAL; | |
1103 | case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; | |
77adbd22 | 1104 | case OPAL_BUSY: |
e3c5c2e0 CLG |
1105 | case OPAL_BUSY_EVENT: return -EBUSY; |
1106 | case OPAL_NO_MEM: return -ENOMEM; | |
14aae78f | 1107 | case OPAL_PERMISSION: return -EPERM; |
e3c5c2e0 CLG |
1108 | |
1109 | case OPAL_UNSUPPORTED: return -EIO; | |
1110 | case OPAL_HARDWARE: return -EIO; | |
1111 | case OPAL_INTERNAL_ERROR: return -EIO; | |
cb8b340d | 1112 | case OPAL_TIMEOUT: return -ETIMEDOUT; |
e3c5c2e0 CLG |
1113 | default: |
1114 | pr_err("%s: unexpected OPAL error %d\n", __func__, rc); | |
1115 | return -EIO; | |
1116 | } | |
1117 | } | |
1118 | ||
1d0761d2 AP |
1119 | void powernv_set_nmmu_ptcr(unsigned long ptcr) |
1120 | { | |
1121 | int rc; | |
1122 | ||
1123 | if (firmware_has_feature(FW_FEATURE_OPAL)) { | |
1124 | rc = opal_nmmu_set_ptcr(-1UL, ptcr); | |
1125 | if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) | |
1126 | pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); | |
1127 | } | |
1128 | } | |
1129 | ||
16b1d26e NG |
1130 | EXPORT_SYMBOL_GPL(opal_poll_events); |
1131 | EXPORT_SYMBOL_GPL(opal_rtc_read); | |
1132 | EXPORT_SYMBOL_GPL(opal_rtc_write); | |
1133 | EXPORT_SYMBOL_GPL(opal_tpo_read); | |
1134 | EXPORT_SYMBOL_GPL(opal_tpo_write); | |
47083450 | 1135 | EXPORT_SYMBOL_GPL(opal_i2c_request); |
c159b596 VH |
1136 | /* Export these symbols for PowerNV LED class driver */ |
1137 | EXPORT_SYMBOL_GPL(opal_leds_get_ind); | |
1138 | EXPORT_SYMBOL_GPL(opal_leds_set_ind); | |
43a1dd9b SJS |
1139 | /* Export this symbol for PowerNV Operator Panel class driver */ |
1140 | EXPORT_SYMBOL_GPL(opal_write_oppanel_async); | |
ffe6d810 PM |
1141 | /* Export this for KVM */ |
1142 | EXPORT_SYMBOL_GPL(opal_int_set_mfrr); | |
5af50993 | 1143 | EXPORT_SYMBOL_GPL(opal_int_eoi); |
77adbd22 | 1144 | EXPORT_SYMBOL_GPL(opal_error_code); |
656ecc16 HM |
1145 | /* Export the below symbol for NX compression */ |
1146 | EXPORT_SYMBOL(opal_nx_coproc_init); |