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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 | ||
12 | #undef DEBUG | |
13 | ||
14 | #include <linux/types.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/of_platform.h> | |
a125e092 | 17 | #include <linux/interrupt.h> |
1bc98de2 | 18 | #include <linux/notifier.h> |
73ed148a | 19 | #include <linux/slab.h> |
14a43e69 BH |
20 | #include <asm/opal.h> |
21 | #include <asm/firmware.h> | |
22 | ||
23 | #include "powernv.h" | |
24 | ||
25 | struct opal { | |
26 | u64 base; | |
27 | u64 entry; | |
28 | } opal; | |
29 | ||
30 | static struct device_node *opal_node; | |
31 | static DEFINE_SPINLOCK(opal_write_lock); | |
ed79ba9e | 32 | extern u64 opal_mc_secondary_handler[]; |
73ed148a BH |
33 | static unsigned int *opal_irqs; |
34 | static unsigned int opal_irq_count; | |
1bc98de2 GS |
35 | static ATOMIC_NOTIFIER_HEAD(opal_notifier_head); |
36 | static DEFINE_SPINLOCK(opal_notifier_lock); | |
37 | static uint64_t last_notified_mask = 0x0ul; | |
38 | static atomic_t opal_notifier_hold = ATOMIC_INIT(0); | |
14a43e69 BH |
39 | |
40 | int __init early_init_dt_scan_opal(unsigned long node, | |
41 | const char *uname, int depth, void *data) | |
42 | { | |
43 | const void *basep, *entryp; | |
44 | unsigned long basesz, entrysz; | |
45 | ||
46 | if (depth != 1 || strcmp(uname, "ibm,opal") != 0) | |
47 | return 0; | |
48 | ||
49 | basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); | |
50 | entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); | |
51 | ||
52 | if (!basep || !entryp) | |
53 | return 1; | |
54 | ||
55 | opal.base = of_read_number(basep, basesz/4); | |
56 | opal.entry = of_read_number(entryp, entrysz/4); | |
57 | ||
58 | pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%ld)\n", | |
59 | opal.base, basep, basesz); | |
60 | pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%ld)\n", | |
61 | opal.entry, entryp, entrysz); | |
62 | ||
63 | powerpc_firmware_features |= FW_FEATURE_OPAL; | |
75b93da4 BH |
64 | if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { |
65 | powerpc_firmware_features |= FW_FEATURE_OPALv2; | |
66 | powerpc_firmware_features |= FW_FEATURE_OPALv3; | |
67 | printk("OPAL V3 detected !\n"); | |
68 | } else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) { | |
14a43e69 BH |
69 | powerpc_firmware_features |= FW_FEATURE_OPALv2; |
70 | printk("OPAL V2 detected !\n"); | |
71 | } else { | |
72 | printk("OPAL V1 detected !\n"); | |
73 | } | |
74 | ||
c4463b37 JK |
75 | return 1; |
76 | } | |
77 | ||
78 | static int __init opal_register_exception_handlers(void) | |
79 | { | |
80 | u64 glue; | |
81 | ||
82 | if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) | |
83 | return -ENODEV; | |
84 | ||
ed79ba9e BH |
85 | /* Hookup some exception handlers. We use the fwnmi area at 0x7000 |
86 | * to provide the glue space to OPAL | |
87 | */ | |
88 | glue = 0x7000; | |
89 | opal_register_exception_handler(OPAL_MACHINE_CHECK_HANDLER, | |
90 | __pa(opal_mc_secondary_handler[0]), | |
91 | glue); | |
92 | glue += 128; | |
93 | opal_register_exception_handler(OPAL_HYPERVISOR_MAINTENANCE_HANDLER, | |
94 | 0, glue); | |
95 | glue += 128; | |
96 | opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); | |
97 | ||
c4463b37 | 98 | return 0; |
14a43e69 BH |
99 | } |
100 | ||
c4463b37 JK |
101 | early_initcall(opal_register_exception_handlers); |
102 | ||
1bc98de2 GS |
103 | int opal_notifier_register(struct notifier_block *nb) |
104 | { | |
105 | if (!nb) { | |
106 | pr_warning("%s: Invalid argument (%p)\n", | |
107 | __func__, nb); | |
108 | return -EINVAL; | |
109 | } | |
110 | ||
111 | atomic_notifier_chain_register(&opal_notifier_head, nb); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | static void opal_do_notifier(uint64_t events) | |
116 | { | |
117 | unsigned long flags; | |
118 | uint64_t changed_mask; | |
119 | ||
120 | if (atomic_read(&opal_notifier_hold)) | |
121 | return; | |
122 | ||
123 | spin_lock_irqsave(&opal_notifier_lock, flags); | |
124 | changed_mask = last_notified_mask ^ events; | |
125 | last_notified_mask = events; | |
126 | spin_unlock_irqrestore(&opal_notifier_lock, flags); | |
127 | ||
128 | /* | |
129 | * We feed with the event bits and changed bits for | |
130 | * enough information to the callback. | |
131 | */ | |
132 | atomic_notifier_call_chain(&opal_notifier_head, | |
133 | events, (void *)changed_mask); | |
134 | } | |
135 | ||
136 | void opal_notifier_update_evt(uint64_t evt_mask, | |
137 | uint64_t evt_val) | |
138 | { | |
139 | unsigned long flags; | |
140 | ||
141 | spin_lock_irqsave(&opal_notifier_lock, flags); | |
142 | last_notified_mask &= ~evt_mask; | |
143 | last_notified_mask |= evt_val; | |
144 | spin_unlock_irqrestore(&opal_notifier_lock, flags); | |
145 | } | |
146 | ||
147 | void opal_notifier_enable(void) | |
148 | { | |
149 | int64_t rc; | |
150 | uint64_t evt = 0; | |
151 | ||
152 | atomic_set(&opal_notifier_hold, 0); | |
153 | ||
154 | /* Process pending events */ | |
155 | rc = opal_poll_events(&evt); | |
156 | if (rc == OPAL_SUCCESS && evt) | |
157 | opal_do_notifier(evt); | |
158 | } | |
159 | ||
160 | void opal_notifier_disable(void) | |
161 | { | |
162 | atomic_set(&opal_notifier_hold, 1); | |
163 | } | |
164 | ||
14a43e69 BH |
165 | int opal_get_chars(uint32_t vtermno, char *buf, int count) |
166 | { | |
167 | s64 len, rc; | |
168 | u64 evt; | |
169 | ||
170 | if (!opal.entry) | |
daea1175 | 171 | return -ENODEV; |
14a43e69 BH |
172 | opal_poll_events(&evt); |
173 | if ((evt & OPAL_EVENT_CONSOLE_INPUT) == 0) | |
174 | return 0; | |
175 | len = count; | |
176 | rc = opal_console_read(vtermno, &len, buf); | |
177 | if (rc == OPAL_SUCCESS) | |
178 | return len; | |
179 | return 0; | |
180 | } | |
181 | ||
182 | int opal_put_chars(uint32_t vtermno, const char *data, int total_len) | |
183 | { | |
184 | int written = 0; | |
daea1175 | 185 | s64 len, rc; |
14a43e69 BH |
186 | unsigned long flags; |
187 | u64 evt; | |
188 | ||
189 | if (!opal.entry) | |
daea1175 | 190 | return -ENODEV; |
14a43e69 BH |
191 | |
192 | /* We want put_chars to be atomic to avoid mangling of hvsi | |
193 | * packets. To do that, we first test for room and return | |
daea1175 BH |
194 | * -EAGAIN if there isn't enough. |
195 | * | |
196 | * Unfortunately, opal_console_write_buffer_space() doesn't | |
197 | * appear to work on opal v1, so we just assume there is | |
198 | * enough room and be done with it | |
14a43e69 BH |
199 | */ |
200 | spin_lock_irqsave(&opal_write_lock, flags); | |
daea1175 BH |
201 | if (firmware_has_feature(FW_FEATURE_OPALv2)) { |
202 | rc = opal_console_write_buffer_space(vtermno, &len); | |
203 | if (rc || len < total_len) { | |
204 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
205 | /* Closed -> drop characters */ | |
206 | if (rc) | |
207 | return total_len; | |
208 | opal_poll_events(&evt); | |
209 | return -EAGAIN; | |
210 | } | |
14a43e69 BH |
211 | } |
212 | ||
213 | /* We still try to handle partial completions, though they | |
214 | * should no longer happen. | |
215 | */ | |
daea1175 | 216 | rc = OPAL_BUSY; |
14a43e69 BH |
217 | while(total_len > 0 && (rc == OPAL_BUSY || |
218 | rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { | |
219 | len = total_len; | |
220 | rc = opal_console_write(vtermno, &len, data); | |
1de1455f BH |
221 | |
222 | /* Closed or other error drop */ | |
223 | if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && | |
224 | rc != OPAL_BUSY_EVENT) { | |
225 | written = total_len; | |
226 | break; | |
227 | } | |
14a43e69 BH |
228 | if (rc == OPAL_SUCCESS) { |
229 | total_len -= len; | |
230 | data += len; | |
231 | written += len; | |
232 | } | |
233 | /* This is a bit nasty but we need that for the console to | |
234 | * flush when there aren't any interrupts. We will clean | |
235 | * things a bit later to limit that to synchronous path | |
236 | * such as the kernel console and xmon/udbg | |
237 | */ | |
238 | do | |
239 | opal_poll_events(&evt); | |
240 | while(rc == OPAL_SUCCESS && (evt & OPAL_EVENT_CONSOLE_OUTPUT)); | |
241 | } | |
242 | spin_unlock_irqrestore(&opal_write_lock, flags); | |
243 | return written; | |
244 | } | |
245 | ||
ed79ba9e BH |
246 | int opal_machine_check(struct pt_regs *regs) |
247 | { | |
248 | struct opal_machine_check_event *opal_evt = get_paca()->opal_mc_evt; | |
249 | struct opal_machine_check_event evt; | |
250 | const char *level, *sevstr, *subtype; | |
251 | static const char *opal_mc_ue_types[] = { | |
252 | "Indeterminate", | |
253 | "Instruction fetch", | |
254 | "Page table walk ifetch", | |
255 | "Load/Store", | |
256 | "Page table walk Load/Store", | |
257 | }; | |
258 | static const char *opal_mc_slb_types[] = { | |
259 | "Indeterminate", | |
260 | "Parity", | |
261 | "Multihit", | |
262 | }; | |
263 | static const char *opal_mc_erat_types[] = { | |
264 | "Indeterminate", | |
265 | "Parity", | |
266 | "Multihit", | |
267 | }; | |
268 | static const char *opal_mc_tlb_types[] = { | |
269 | "Indeterminate", | |
270 | "Parity", | |
271 | "Multihit", | |
272 | }; | |
273 | ||
274 | /* Copy the event structure and release the original */ | |
275 | evt = *opal_evt; | |
276 | opal_evt->in_use = 0; | |
277 | ||
278 | /* Print things out */ | |
279 | if (evt.version != OpalMCE_V1) { | |
280 | pr_err("Machine Check Exception, Unknown event version %d !\n", | |
281 | evt.version); | |
282 | return 0; | |
283 | } | |
284 | switch(evt.severity) { | |
285 | case OpalMCE_SEV_NO_ERROR: | |
286 | level = KERN_INFO; | |
287 | sevstr = "Harmless"; | |
288 | break; | |
289 | case OpalMCE_SEV_WARNING: | |
290 | level = KERN_WARNING; | |
291 | sevstr = ""; | |
292 | break; | |
293 | case OpalMCE_SEV_ERROR_SYNC: | |
294 | level = KERN_ERR; | |
295 | sevstr = "Severe"; | |
296 | break; | |
297 | case OpalMCE_SEV_FATAL: | |
298 | default: | |
299 | level = KERN_ERR; | |
300 | sevstr = "Fatal"; | |
301 | break; | |
302 | } | |
303 | ||
304 | printk("%s%s Machine check interrupt [%s]\n", level, sevstr, | |
305 | evt.disposition == OpalMCE_DISPOSITION_RECOVERED ? | |
306 | "Recovered" : "[Not recovered"); | |
307 | printk("%s Initiator: %s\n", level, | |
308 | evt.initiator == OpalMCE_INITIATOR_CPU ? "CPU" : "Unknown"); | |
309 | switch(evt.error_type) { | |
310 | case OpalMCE_ERROR_TYPE_UE: | |
311 | subtype = evt.u.ue_error.ue_error_type < | |
312 | ARRAY_SIZE(opal_mc_ue_types) ? | |
313 | opal_mc_ue_types[evt.u.ue_error.ue_error_type] | |
314 | : "Unknown"; | |
315 | printk("%s Error type: UE [%s]\n", level, subtype); | |
316 | if (evt.u.ue_error.effective_address_provided) | |
317 | printk("%s Effective address: %016llx\n", | |
318 | level, evt.u.ue_error.effective_address); | |
319 | if (evt.u.ue_error.physical_address_provided) | |
320 | printk("%s Physial address: %016llx\n", | |
321 | level, evt.u.ue_error.physical_address); | |
322 | break; | |
323 | case OpalMCE_ERROR_TYPE_SLB: | |
324 | subtype = evt.u.slb_error.slb_error_type < | |
325 | ARRAY_SIZE(opal_mc_slb_types) ? | |
326 | opal_mc_slb_types[evt.u.slb_error.slb_error_type] | |
327 | : "Unknown"; | |
328 | printk("%s Error type: SLB [%s]\n", level, subtype); | |
329 | if (evt.u.slb_error.effective_address_provided) | |
330 | printk("%s Effective address: %016llx\n", | |
331 | level, evt.u.slb_error.effective_address); | |
332 | break; | |
333 | case OpalMCE_ERROR_TYPE_ERAT: | |
334 | subtype = evt.u.erat_error.erat_error_type < | |
335 | ARRAY_SIZE(opal_mc_erat_types) ? | |
336 | opal_mc_erat_types[evt.u.erat_error.erat_error_type] | |
337 | : "Unknown"; | |
338 | printk("%s Error type: ERAT [%s]\n", level, subtype); | |
339 | if (evt.u.erat_error.effective_address_provided) | |
340 | printk("%s Effective address: %016llx\n", | |
341 | level, evt.u.erat_error.effective_address); | |
342 | break; | |
343 | case OpalMCE_ERROR_TYPE_TLB: | |
344 | subtype = evt.u.tlb_error.tlb_error_type < | |
345 | ARRAY_SIZE(opal_mc_tlb_types) ? | |
346 | opal_mc_tlb_types[evt.u.tlb_error.tlb_error_type] | |
347 | : "Unknown"; | |
348 | printk("%s Error type: TLB [%s]\n", level, subtype); | |
349 | if (evt.u.tlb_error.effective_address_provided) | |
350 | printk("%s Effective address: %016llx\n", | |
351 | level, evt.u.tlb_error.effective_address); | |
352 | break; | |
353 | default: | |
354 | case OpalMCE_ERROR_TYPE_UNKNOWN: | |
355 | printk("%s Error type: Unknown\n", level); | |
356 | break; | |
357 | } | |
358 | return evt.severity == OpalMCE_SEV_FATAL ? 0 : 1; | |
359 | } | |
360 | ||
a125e092 BH |
361 | static irqreturn_t opal_interrupt(int irq, void *data) |
362 | { | |
363 | uint64_t events; | |
364 | ||
365 | opal_handle_interrupt(virq_to_hw(irq), &events); | |
366 | ||
1bc98de2 | 367 | opal_do_notifier(events); |
a125e092 BH |
368 | |
369 | return IRQ_HANDLED; | |
370 | } | |
371 | ||
14a43e69 BH |
372 | static int __init opal_init(void) |
373 | { | |
374 | struct device_node *np, *consoles; | |
a125e092 BH |
375 | const u32 *irqs; |
376 | int rc, i, irqlen; | |
14a43e69 BH |
377 | |
378 | opal_node = of_find_node_by_path("/ibm,opal"); | |
379 | if (!opal_node) { | |
380 | pr_warn("opal: Node not found\n"); | |
381 | return -ENODEV; | |
382 | } | |
383 | if (firmware_has_feature(FW_FEATURE_OPALv2)) | |
384 | consoles = of_find_node_by_path("/ibm,opal/consoles"); | |
385 | else | |
386 | consoles = of_node_get(opal_node); | |
387 | ||
388 | /* Register serial ports */ | |
389 | for_each_child_of_node(consoles, np) { | |
390 | if (strcmp(np->name, "serial")) | |
391 | continue; | |
392 | of_platform_device_create(np, NULL, NULL); | |
393 | } | |
394 | of_node_put(consoles); | |
a125e092 BH |
395 | |
396 | /* Find all OPAL interrupts and request them */ | |
397 | irqs = of_get_property(opal_node, "opal-interrupts", &irqlen); | |
398 | pr_debug("opal: Found %d interrupts reserved for OPAL\n", | |
399 | irqs ? (irqlen / 4) : 0); | |
73ed148a BH |
400 | opal_irq_count = irqlen / 4; |
401 | opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL); | |
a125e092 BH |
402 | for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) { |
403 | unsigned int hwirq = be32_to_cpup(irqs); | |
404 | unsigned int irq = irq_create_mapping(NULL, hwirq); | |
405 | if (irq == NO_IRQ) { | |
406 | pr_warning("opal: Failed to map irq 0x%x\n", hwirq); | |
407 | continue; | |
408 | } | |
409 | rc = request_irq(irq, opal_interrupt, 0, "opal", NULL); | |
410 | if (rc) | |
411 | pr_warning("opal: Error %d requesting irq %d" | |
412 | " (0x%x)\n", rc, irq, hwirq); | |
73ed148a | 413 | opal_irqs[i] = irq; |
a125e092 | 414 | } |
14a43e69 BH |
415 | return 0; |
416 | } | |
417 | subsys_initcall(opal_init); | |
73ed148a BH |
418 | |
419 | void opal_shutdown(void) | |
420 | { | |
421 | unsigned int i; | |
422 | ||
423 | for (i = 0; i < opal_irq_count; i++) { | |
424 | if (opal_irqs[i]) | |
b0d436c7 | 425 | free_irq(opal_irqs[i], NULL); |
73ed148a BH |
426 | opal_irqs[i] = 0; |
427 | } | |
428 | } |