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75eb3d9b | 1 | /* |
c28237f1 | 2 | * OPAL asynchronus Memory error handling support in PowerNV. |
75eb3d9b MS |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
18 | * Copyright 2013 IBM Corporation | |
19 | * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> | |
20 | */ | |
21 | ||
22 | #undef DEBUG | |
23 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/of.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/slab.h> | |
29 | ||
b14726c5 | 30 | #include <asm/machdep.h> |
75eb3d9b MS |
31 | #include <asm/opal.h> |
32 | #include <asm/cputable.h> | |
33 | ||
34 | static int opal_mem_err_nb_init; | |
35 | static LIST_HEAD(opal_memory_err_list); | |
36 | static DEFINE_SPINLOCK(opal_mem_err_lock); | |
37 | ||
38 | struct OpalMsgNode { | |
39 | struct list_head list; | |
40 | struct opal_msg msg; | |
41 | }; | |
42 | ||
43 | static void handle_memory_error_event(struct OpalMemoryErrorData *merr_evt) | |
44 | { | |
45 | uint64_t paddr_start, paddr_end; | |
46 | ||
6e8a9279 | 47 | pr_debug("%s: Retrieved memory error event, type: 0x%x\n", |
75eb3d9b MS |
48 | __func__, merr_evt->type); |
49 | switch (merr_evt->type) { | |
50 | case OPAL_MEM_ERR_TYPE_RESILIENCE: | |
223ca9d8 AB |
51 | paddr_start = be64_to_cpu(merr_evt->u.resilience.physical_address_start); |
52 | paddr_end = be64_to_cpu(merr_evt->u.resilience.physical_address_end); | |
75eb3d9b MS |
53 | break; |
54 | case OPAL_MEM_ERR_TYPE_DYN_DALLOC: | |
223ca9d8 AB |
55 | paddr_start = be64_to_cpu(merr_evt->u.dyn_dealloc.physical_address_start); |
56 | paddr_end = be64_to_cpu(merr_evt->u.dyn_dealloc.physical_address_end); | |
75eb3d9b MS |
57 | break; |
58 | default: | |
59 | return; | |
60 | } | |
61 | ||
62 | for (; paddr_start < paddr_end; paddr_start += PAGE_SIZE) { | |
83b57531 | 63 | memory_failure(paddr_start >> PAGE_SHIFT, 0); |
75eb3d9b MS |
64 | } |
65 | } | |
66 | ||
67 | static void handle_memory_error(void) | |
68 | { | |
69 | unsigned long flags; | |
70 | struct OpalMemoryErrorData *merr_evt; | |
71 | struct OpalMsgNode *msg_node; | |
72 | ||
73 | spin_lock_irqsave(&opal_mem_err_lock, flags); | |
74 | while (!list_empty(&opal_memory_err_list)) { | |
75 | msg_node = list_entry(opal_memory_err_list.next, | |
76 | struct OpalMsgNode, list); | |
77 | list_del(&msg_node->list); | |
78 | spin_unlock_irqrestore(&opal_mem_err_lock, flags); | |
79 | ||
80 | merr_evt = (struct OpalMemoryErrorData *) | |
81 | &msg_node->msg.params[0]; | |
82 | handle_memory_error_event(merr_evt); | |
83 | kfree(msg_node); | |
84 | spin_lock_irqsave(&opal_mem_err_lock, flags); | |
85 | } | |
86 | spin_unlock_irqrestore(&opal_mem_err_lock, flags); | |
87 | } | |
88 | ||
89 | static void mem_error_handler(struct work_struct *work) | |
90 | { | |
91 | handle_memory_error(); | |
92 | } | |
93 | ||
94 | static DECLARE_WORK(mem_error_work, mem_error_handler); | |
95 | ||
96 | /* | |
97 | * opal_memory_err_event - notifier handler that queues up the opal message | |
98 | * to be preocessed later. | |
99 | */ | |
100 | static int opal_memory_err_event(struct notifier_block *nb, | |
101 | unsigned long msg_type, void *msg) | |
102 | { | |
103 | unsigned long flags; | |
104 | struct OpalMsgNode *msg_node; | |
105 | ||
106 | if (msg_type != OPAL_MSG_MEM_ERR) | |
107 | return 0; | |
108 | ||
109 | msg_node = kzalloc(sizeof(*msg_node), GFP_ATOMIC); | |
110 | if (!msg_node) { | |
111 | pr_err("MEMORY_ERROR: out of memory, Opal message event not" | |
112 | "handled\n"); | |
113 | return -ENOMEM; | |
114 | } | |
115 | memcpy(&msg_node->msg, msg, sizeof(struct opal_msg)); | |
116 | ||
117 | spin_lock_irqsave(&opal_mem_err_lock, flags); | |
118 | list_add(&msg_node->list, &opal_memory_err_list); | |
119 | spin_unlock_irqrestore(&opal_mem_err_lock, flags); | |
120 | ||
121 | schedule_work(&mem_error_work); | |
122 | return 0; | |
123 | } | |
124 | ||
125 | static struct notifier_block opal_mem_err_nb = { | |
126 | .notifier_call = opal_memory_err_event, | |
127 | .next = NULL, | |
128 | .priority = 0, | |
129 | }; | |
130 | ||
131 | static int __init opal_mem_err_init(void) | |
132 | { | |
133 | int ret; | |
134 | ||
135 | if (!opal_mem_err_nb_init) { | |
136 | ret = opal_message_notifier_register( | |
137 | OPAL_MSG_MEM_ERR, &opal_mem_err_nb); | |
138 | if (ret) { | |
139 | pr_err("%s: Can't register OPAL event notifier (%d)\n", | |
140 | __func__, ret); | |
141 | return ret; | |
142 | } | |
143 | opal_mem_err_nb_init = 1; | |
144 | } | |
145 | return 0; | |
146 | } | |
96e023e7 | 147 | machine_device_initcall(powernv, opal_mem_err_init); |