summaryrefslogtreecommitdiffstats
path: root/kernel/arch/powerpc/platforms/powernv/opal-hmi.c
blob: b322bfb51343f65fdfe76d265cdcb76928011d21 (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
/*
 * OPAL hypervisor Maintenance interrupt handling support in PowreNV.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright 2014 IBM Corporation
 * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
 */

#undef DEBUG

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/mm.h>
#include <linux/slab.h>

#include <asm/opal.h>
#include <asm/cputable.h>
#include <asm/machdep.h>

static int opal_hmi_handler_nb_init;
struct OpalHmiEvtNode {
	struct list_head list;
	struct OpalHMIEvent hmi_evt;
};
static LIST_HEAD(opal_hmi_evt_list);
static DEFINE_SPINLOCK(opal_hmi_evt_lock);

static void print_hmi_event_info(struct OpalHMIEvent *hmi_evt)
{
	const char *level, *sevstr, *error_info;
	static const char *hmi_error_types[] = {
		"Malfunction Alert",
		"Processor Recovery done",
		"Processor recovery occurred again",
		"Processor recovery occurred for masked error",
		"Timer facility experienced an error",
		"TFMR SPR is corrupted",
		"UPS (Uniterrupted Power System) Overflow indication",
		"An XSCOM operation failure",
		"An XSCOM operation completed",
		"SCOM has set a reserved FIR bit to cause recovery",
		"Debug trigger has set a reserved FIR bit to cause recovery",
		"A hypervisor resource error occurred"
	};

	/* Print things out */
	if (hmi_evt->version < OpalHMIEvt_V1) {
		pr_err("HMI Interrupt, Unknown event version %d !\n",
			hmi_evt->version);
		return;
	}
	switch (hmi_evt->severity) {
	case OpalHMI_SEV_NO_ERROR:
		level = KERN_INFO;
		sevstr = "Harmless";
		break;
	case OpalHMI_SEV_WARNING:
		level = KERN_WARNING;
		sevstr = "";
		break;
	case OpalHMI_SEV_ERROR_SYNC:
		level = KERN_ERR;
		sevstr = "Severe";
		break;
	case OpalHMI_SEV_FATAL:
	default:
		level = KERN_ERR;
		sevstr = "Fatal";
		break;
	}

	printk("%s%s Hypervisor Maintenance interrupt [%s]\n",
		level, sevstr,
		hmi_evt->disposition == OpalHMI_DISPOSITION_RECOVERED ?
		"Recovered" : "Not recovered");
	error_info = hmi_evt->type < ARRAY_SIZE(hmi_error_types) ?
			hmi_error_types[hmi_evt->type]
			: "Unknown";
	printk("%s Error detail: %s\n", level, error_info);
	printk("%s	HMER: %016llx\n", level, be64_to_cpu(hmi_evt->hmer));
	if ((hmi_evt->type == OpalHMI_ERROR_TFAC) ||
		(hmi_evt->type == OpalHMI_ERROR_TFMR_PARITY))
		printk("%s	TFMR: %016llx\n", level,
						be64_to_cpu(hmi_evt->tfmr));
}

static void hmi_event_handler(struct work_struct *work)
{
	unsigned long flags;
	struct OpalHMIEvent *hmi_evt;
	struct OpalHmiEvtNode *msg_node;
	uint8_t disposition;

	spin_lock_irqsave(&opal_hmi_evt_lock, flags);
	while (!list_empty(&opal_hmi_evt_list)) {
		msg_node = list_entry(opal_hmi_evt_list.next,
					   struct OpalHmiEvtNode, list);
		list_del(&msg_node->list);
		spin_unlock_irqrestore(&opal_hmi_evt_lock, flags);

		hmi_evt = (struct OpalHMIEvent *) &msg_node->hmi_evt;
		print_hmi_event_info(hmi_evt);
		disposition = hmi_evt->disposition;
		kfree(msg_node);

		/*
		 * Check if HMI event has been recovered or not. If not
		 * then we can't continue, invoke panic.
		 */
		if (disposition != OpalHMI_DISPOSITION_RECOVERED)
			panic("Unrecoverable HMI exception");

		spin_lock_irqsave(&opal_hmi_evt_lock, flags);
	}
	spin_unlock_irqrestore(&opal_hmi_evt_lock, flags);
}

static DECLARE_WORK(hmi_event_work, hmi_event_handler);
/*
 * opal_handle_hmi_event - notifier handler that queues up HMI events
 * to be preocessed later.
 */
static int opal_handle_hmi_event(struct notifier_block *nb,
			  unsigned long msg_type, void *msg)
{
	unsigned long flags;
	struct OpalHMIEvent *hmi_evt;
	struct opal_msg *hmi_msg = msg;
	struct OpalHmiEvtNode *msg_node;

	/* Sanity Checks */
	if (msg_type != OPAL_MSG_HMI_EVT)
		return 0;

	/* HMI event info starts from param[0] */
	hmi_evt = (struct OpalHMIEvent *)&hmi_msg->params[0];

	/* Delay the logging of HMI events to workqueue. */
	msg_node = kzalloc(sizeof(*msg_node), GFP_ATOMIC);
	if (!msg_node) {
		pr_err("HMI: out of memory, Opal message event not handled\n");
		return -ENOMEM;
	}
	memcpy(&msg_node->hmi_evt, hmi_evt, sizeof(struct OpalHMIEvent));

	spin_lock_irqsave(&opal_hmi_evt_lock, flags);
	list_add(&msg_node->list, &opal_hmi_evt_list);
	spin_unlock_irqrestore(&opal_hmi_evt_lock, flags);

	schedule_work(&hmi_event_work);
	return 0;
}

static struct notifier_block opal_hmi_handler_nb = {
	.notifier_call	= opal_handle_hmi_event,
	.next		= NULL,
	.priority	= 0,
};

static int __init opal_hmi_handler_init(void)
{
	int ret;

	if (!opal_hmi_handler_nb_init) {
		ret = opal_message_notifier_register(
				OPAL_MSG_HMI_EVT, &opal_hmi_handler_nb);
		if (ret) {
			pr_err("%s: Can't register OPAL event notifier (%d)\n",
			       __func__, ret);
			return ret;
		}
		opal_hmi_handler_nb_init = 1;
	}
	return 0;
}
machine_subsys_initcall(powernv, opal_hmi_handler_init);