summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/powernv/opal.c
blob: 1c798cd553722f6f043a066c299100be89c10f96 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
/*
 * PowerNV OPAL high level interfaces
 *
 * Copyright 2011 IBM Corp.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#undef DEBUG

#include <linux/types.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/slab.h>
#include <linux/kobject.h>
#include <asm/opal.h>
#include <asm/firmware.h>

#include "powernv.h"

/* /sys/firmware/opal */
struct kobject *opal_kobj;

struct opal {
	u64 base;
	u64 entry;
} opal;

static struct device_node *opal_node;
static DEFINE_SPINLOCK(opal_write_lock);
extern u64 opal_mc_secondary_handler[];
static unsigned int *opal_irqs;
static unsigned int opal_irq_count;
static ATOMIC_NOTIFIER_HEAD(opal_notifier_head);
static DEFINE_SPINLOCK(opal_notifier_lock);
static uint64_t last_notified_mask = 0x0ul;
static atomic_t opal_notifier_hold = ATOMIC_INIT(0);

int __init early_init_dt_scan_opal(unsigned long node,
				   const char *uname, int depth, void *data)
{
	const void *basep, *entryp;
	unsigned long basesz, entrysz;

	if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
		return 0;

	basep  = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
	entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);

	if (!basep || !entryp)
		return 1;

	opal.base = of_read_number(basep, basesz/4);
	opal.entry = of_read_number(entryp, entrysz/4);

	pr_debug("OPAL Base  = 0x%llx (basep=%p basesz=%ld)\n",
		 opal.base, basep, basesz);
	pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%ld)\n",
		 opal.entry, entryp, entrysz);

	powerpc_firmware_features |= FW_FEATURE_OPAL;
	if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) {
		powerpc_firmware_features |= FW_FEATURE_OPALv2;
		powerpc_firmware_features |= FW_FEATURE_OPALv3;
		printk("OPAL V3 detected !\n");
	} else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) {
		powerpc_firmware_features |= FW_FEATURE_OPALv2;
		printk("OPAL V2 detected !\n");
	} else {
		printk("OPAL V1 detected !\n");
	}

	return 1;
}

static int __init opal_register_exception_handlers(void)
{
#ifdef __BIG_ENDIAN__
	u64 glue;

	if (!(powerpc_firmware_features & FW_FEATURE_OPAL))
		return -ENODEV;

	/* Hookup some exception handlers. We use the fwnmi area at 0x7000
	 * to provide the glue space to OPAL
	 */
	glue = 0x7000;
	opal_register_exception_handler(OPAL_MACHINE_CHECK_HANDLER,
					__pa(opal_mc_secondary_handler[0]),
					glue);
	glue += 128;
	opal_register_exception_handler(OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
					0, glue);
	glue += 128;
	opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
#endif

	return 0;
}

early_initcall(opal_register_exception_handlers);

int opal_notifier_register(struct notifier_block *nb)
{
	if (!nb) {
		pr_warning("%s: Invalid argument (%p)\n",
			   __func__, nb);
		return -EINVAL;
	}

	atomic_notifier_chain_register(&opal_notifier_head, nb);
	return 0;
}

static void opal_do_notifier(uint64_t events)
{
	unsigned long flags;
	uint64_t changed_mask;

	if (atomic_read(&opal_notifier_hold))
		return;

	spin_lock_irqsave(&opal_notifier_lock, flags);
	changed_mask = last_notified_mask ^ events;
	last_notified_mask = events;
	spin_unlock_irqrestore(&opal_notifier_lock, flags);

	/*
	 * We feed with the event bits and changed bits for
	 * enough information to the callback.
	 */
	atomic_notifier_call_chain(&opal_notifier_head,
				   events, (void *)changed_mask);
}

void opal_notifier_update_evt(uint64_t evt_mask,
			      uint64_t evt_val)
{
	unsigned long flags;

	spin_lock_irqsave(&opal_notifier_lock, flags);
	last_notified_mask &= ~evt_mask;
	last_notified_mask |= evt_val;
	spin_unlock_irqrestore(&opal_notifier_lock, flags);
}

void opal_notifier_enable(void)
{
	int64_t rc;
	uint64_t evt = 0;

	atomic_set(&opal_notifier_hold, 0);

	/* Process pending events */
	rc = opal_poll_events(&evt);
	if (rc == OPAL_SUCCESS && evt)
		opal_do_notifier(evt);
}

void opal_notifier_disable(void)
{
	atomic_set(&opal_notifier_hold, 1);
}

int opal_get_chars(uint32_t vtermno, char *buf, int count)
{
	s64 rc;
	__be64 evt, len;

	if (!opal.entry)
		return -ENODEV;
	opal_poll_events(&evt);
	if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0)
		return 0;
	len = cpu_to_be64(count);
	rc = opal_console_read(vtermno, &len, buf);	
	if (rc == OPAL_SUCCESS)
		return be64_to_cpu(len);
	return 0;
}

int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
{
	int written = 0;
	__be64 olen;
	s64 len, rc;
	unsigned long flags;
	__be64 evt;

	if (!opal.entry)
		return -ENODEV;

	/* We want put_chars to be atomic to avoid mangling of hvsi
	 * packets. To do that, we first test for room and return
	 * -EAGAIN if there isn't enough.
	 *
	 * Unfortunately, opal_console_write_buffer_space() doesn't
	 * appear to work on opal v1, so we just assume there is
	 * enough room and be done with it
	 */
	spin_lock_irqsave(&opal_write_lock, flags);
	if (firmware_has_feature(FW_FEATURE_OPALv2)) {
		rc = opal_console_write_buffer_space(vtermno, &olen);
		len = be64_to_cpu(olen);
		if (rc || len < total_len) {
			spin_unlock_irqrestore(&opal_write_lock, flags);
			/* Closed -> drop characters */
			if (rc)
				return total_len;
			opal_poll_events(NULL);
			return -EAGAIN;
		}
	}

	/* We still try to handle partial completions, though they
	 * should no longer happen.
	 */
	rc = OPAL_BUSY;
	while(total_len > 0 && (rc == OPAL_BUSY ||
				rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
		olen = cpu_to_be64(total_len);
		rc = opal_console_write(vtermno, &olen, data);
		len = be64_to_cpu(olen);

		/* Closed or other error drop */
		if (rc != OPAL_SUCCESS && rc != OPAL_BUSY &&
		    rc != OPAL_BUSY_EVENT) {
			written = total_len;
			break;
		}
		if (rc == OPAL_SUCCESS) {
			total_len -= len;
			data += len;
			written += len;
		}
		/* This is a bit nasty but we need that for the console to
		 * flush when there aren't any interrupts. We will clean
		 * things a bit later to limit that to synchronous path
		 * such as the kernel console and xmon/udbg
		 */
		do
			opal_poll_events(&evt);
		while(rc == OPAL_SUCCESS &&
			(be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT));
	}
	spin_unlock_irqrestore(&opal_write_lock, flags);
	return written;
}

int opal_machine_check(struct pt_regs *regs)
{
	struct opal_machine_check_event *opal_evt = get_paca()->opal_mc_evt;
	struct opal_machine_check_event evt;
	const char *level, *sevstr, *subtype;
	static const char *opal_mc_ue_types[] = {
		"Indeterminate",
		"Instruction fetch",
		"Page table walk ifetch",
		"Load/Store",
		"Page table walk Load/Store",
	};
	static const char *opal_mc_slb_types[] = {
		"Indeterminate",
		"Parity",
		"Multihit",
	};
	static const char *opal_mc_erat_types[] = {
		"Indeterminate",
		"Parity",
		"Multihit",
	};
	static const char *opal_mc_tlb_types[] = {
		"Indeterminate",
		"Parity",
		"Multihit",
	};

	/* Copy the event structure and release the original */
	evt = *opal_evt;
	opal_evt->in_use = 0;

	/* Print things out */
	if (evt.version != OpalMCE_V1) {
		pr_err("Machine Check Exception, Unknown event version %d !\n",
		       evt.version);
		return 0;
	}
	switch(evt.severity) {
	case OpalMCE_SEV_NO_ERROR:
		level = KERN_INFO;
		sevstr = "Harmless";
		break;
	case OpalMCE_SEV_WARNING:
		level = KERN_WARNING;
		sevstr = "";
		break;
	case OpalMCE_SEV_ERROR_SYNC:
		level = KERN_ERR;
		sevstr = "Severe";
		break;
	case OpalMCE_SEV_FATAL:
	default:
		level = KERN_ERR;
		sevstr = "Fatal";
		break;
	}

	printk("%s%s Machine check interrupt [%s]\n", level, sevstr,
	       evt.disposition == OpalMCE_DISPOSITION_RECOVERED ?
	       "Recovered" : "[Not recovered");
	printk("%s  Initiator: %s\n", level,
	       evt.initiator == OpalMCE_INITIATOR_CPU ? "CPU" : "Unknown");
	switch(evt.error_type) {
	case OpalMCE_ERROR_TYPE_UE:
		subtype = evt.u.ue_error.ue_error_type <
			ARRAY_SIZE(opal_mc_ue_types) ?
			opal_mc_ue_types[evt.u.ue_error.ue_error_type]
			: "Unknown";
		printk("%s  Error type: UE [%s]\n", level, subtype);
		if (evt.u.ue_error.effective_address_provided)
			printk("%s    Effective address: %016llx\n",
			       level, evt.u.ue_error.effective_address);
		if (evt.u.ue_error.physical_address_provided)
			printk("%s      Physial address: %016llx\n",
			       level, evt.u.ue_error.physical_address);
		break;
	case OpalMCE_ERROR_TYPE_SLB:
		subtype = evt.u.slb_error.slb_error_type <
			ARRAY_SIZE(opal_mc_slb_types) ?
			opal_mc_slb_types[evt.u.slb_error.slb_error_type]
			: "Unknown";
		printk("%s  Error type: SLB [%s]\n", level, subtype);
		if (evt.u.slb_error.effective_address_provided)
			printk("%s    Effective address: %016llx\n",
			       level, evt.u.slb_error.effective_address);
		break;
	case OpalMCE_ERROR_TYPE_ERAT:
		subtype = evt.u.erat_error.erat_error_type <
			ARRAY_SIZE(opal_mc_erat_types) ?
			opal_mc_erat_types[evt.u.erat_error.erat_error_type]
			: "Unknown";
		printk("%s  Error type: ERAT [%s]\n", level, subtype);
		if (evt.u.erat_error.effective_address_provided)
			printk("%s    Effective address: %016llx\n",
			       level, evt.u.erat_error.effective_address);
		break;
	case OpalMCE_ERROR_TYPE_TLB:
		subtype = evt.u.tlb_error.tlb_error_type <
			ARRAY_SIZE(opal_mc_tlb_types) ?
			opal_mc_tlb_types[evt.u.tlb_error.tlb_error_type]
			: "Unknown";
		printk("%s  Error type: TLB [%s]\n", level, subtype);
		if (evt.u.tlb_error.effective_address_provided)
			printk("%s    Effective address: %016llx\n",
			       level, evt.u.tlb_error.effective_address);
		break;
	default:
	case OpalMCE_ERROR_TYPE_UNKNOWN:
		printk("%s  Error type: Unknown\n", level);
		break;
	}
	return evt.severity == OpalMCE_SEV_FATAL ? 0 : 1;
}

static irqreturn_t opal_interrupt(int irq, void *data)
{
	__be64 events;

	opal_handle_interrupt(virq_to_hw(irq), &events);

	opal_do_notifier(events);

	return IRQ_HANDLED;
}

static int opal_sysfs_init(void)
{
	opal_kobj = kobject_create_and_add("opal", firmware_kobj);
	if (!opal_kobj) {
		pr_warn("kobject_create_and_add opal failed\n");
		return -ENOMEM;
	}

	return 0;
}

static int __init opal_init(void)
{
	struct device_node *np, *consoles;
	const __be32 *irqs;
	int rc, i, irqlen;

	opal_node = of_find_node_by_path("/ibm,opal");
	if (!opal_node) {
		pr_warn("opal: Node not found\n");
		return -ENODEV;
	}

	/* Register OPAL consoles if any ports */
	if (firmware_has_feature(FW_FEATURE_OPALv2))
		consoles = of_find_node_by_path("/ibm,opal/consoles");
	else
		consoles = of_node_get(opal_node);
	if (consoles) {
		for_each_child_of_node(consoles, np) {
			if (strcmp(np->name, "serial"))
				continue;
			of_platform_device_create(np, NULL, NULL);
		}
		of_node_put(consoles);
	}

	/* Find all OPAL interrupts and request them */
	irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
	pr_debug("opal: Found %d interrupts reserved for OPAL\n",
		 irqs ? (irqlen / 4) : 0);
	opal_irq_count = irqlen / 4;
	opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL);
	for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) {
		unsigned int hwirq = be32_to_cpup(irqs);
		unsigned int irq = irq_create_mapping(NULL, hwirq);
		if (irq == NO_IRQ) {
			pr_warning("opal: Failed to map irq 0x%x\n", hwirq);
			continue;
		}
		rc = request_irq(irq, opal_interrupt, 0, "opal", NULL);
		if (rc)
			pr_warning("opal: Error %d requesting irq %d"
				   " (0x%x)\n", rc, irq, hwirq);
		opal_irqs[i] = irq;
	}

	/* Create "opal" kobject under /sys/firmware */
	rc = opal_sysfs_init();
	if (rc == 0) {
		/* Setup code update interface */
		opal_flash_init();
	}

	return 0;
}
subsys_initcall(opal_init);

void opal_shutdown(void)
{
	unsigned int i;

	for (i = 0; i < opal_irq_count; i++) {
		if (opal_irqs[i])
			free_irq(opal_irqs[i], NULL);
		opal_irqs[i] = 0;
	}
}
OpenPOWER on IntegriCloud