GNU Linux-libre 4.4.289-gnu1
[releases.git] / drivers / edac / octeon_edac-pc.c
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 2012 Cavium, Inc.
7  *
8  * Copyright (C) 2009 Wind River Systems,
9  *   written by Ralf Baechle <ralf@linux-mips.org>
10  */
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/slab.h>
14 #include <linux/interrupt.h>
15 #include <linux/io.h>
16 #include <linux/edac.h>
17
18 #include "edac_core.h"
19 #include "edac_module.h"
20
21 #include <asm/octeon/cvmx.h>
22 #include <asm/mipsregs.h>
23
24 extern int register_co_cache_error_notifier(struct notifier_block *nb);
25 extern int unregister_co_cache_error_notifier(struct notifier_block *nb);
26
27 extern unsigned long long cache_err_dcache[NR_CPUS];
28
29 struct co_cache_error {
30         struct notifier_block notifier;
31         struct edac_device_ctl_info *ed;
32 };
33
34 /**
35  * EDAC CPU cache error callback
36  *
37  * @event: non-zero if unrecoverable.
38  */
39 static int  co_cache_error_event(struct notifier_block *this,
40         unsigned long event, void *ptr)
41 {
42         struct co_cache_error *p = container_of(this, struct co_cache_error,
43                                                 notifier);
44
45         unsigned int core = cvmx_get_core_num();
46         unsigned int cpu = smp_processor_id();
47         u64 icache_err = read_octeon_c0_icacheerr();
48         u64 dcache_err;
49
50         if (event) {
51                 dcache_err = cache_err_dcache[core];
52                 cache_err_dcache[core] = 0;
53         } else {
54                 dcache_err = read_octeon_c0_dcacheerr();
55         }
56
57         if (icache_err & 1) {
58                 edac_device_printk(p->ed, KERN_ERR,
59                                    "CacheErr (Icache):%llx, core %d/cpu %d, cp0_errorepc == %lx\n",
60                                    (unsigned long long)icache_err, core, cpu,
61                                    read_c0_errorepc());
62                 write_octeon_c0_icacheerr(0);
63                 edac_device_handle_ce(p->ed, cpu, 1, "icache");
64         }
65         if (dcache_err & 1) {
66                 edac_device_printk(p->ed, KERN_ERR,
67                                    "CacheErr (Dcache):%llx, core %d/cpu %d, cp0_errorepc == %lx\n",
68                                    (unsigned long long)dcache_err, core, cpu,
69                                    read_c0_errorepc());
70                 if (event)
71                         edac_device_handle_ue(p->ed, cpu, 0, "dcache");
72                 else
73                         edac_device_handle_ce(p->ed, cpu, 0, "dcache");
74
75                 /* Clear the error indication */
76                 if (OCTEON_IS_OCTEON2())
77                         write_octeon_c0_dcacheerr(1);
78                 else
79                         write_octeon_c0_dcacheerr(0);
80         }
81
82         return NOTIFY_STOP;
83 }
84
85 static int co_cache_error_probe(struct platform_device *pdev)
86 {
87         struct co_cache_error *p = devm_kzalloc(&pdev->dev, sizeof(*p),
88                                                 GFP_KERNEL);
89         if (!p)
90                 return -ENOMEM;
91
92         p->notifier.notifier_call = co_cache_error_event;
93         platform_set_drvdata(pdev, p);
94
95         p->ed = edac_device_alloc_ctl_info(0, "cpu", num_possible_cpus(),
96                                            "cache", 2, 0, NULL, 0,
97                                            edac_device_alloc_index());
98         if (!p->ed)
99                 goto err;
100
101         p->ed->dev = &pdev->dev;
102
103         p->ed->dev_name = dev_name(&pdev->dev);
104
105         p->ed->mod_name = "octeon-cpu";
106         p->ed->ctl_name = "cache";
107
108         if (edac_device_add_device(p->ed)) {
109                 pr_err("%s: edac_device_add_device() failed\n", __func__);
110                 goto err1;
111         }
112
113         register_co_cache_error_notifier(&p->notifier);
114
115         return 0;
116
117 err1:
118         edac_device_free_ctl_info(p->ed);
119 err:
120         return -ENXIO;
121 }
122
123 static int co_cache_error_remove(struct platform_device *pdev)
124 {
125         struct co_cache_error *p = platform_get_drvdata(pdev);
126
127         unregister_co_cache_error_notifier(&p->notifier);
128         edac_device_del_device(&pdev->dev);
129         edac_device_free_ctl_info(p->ed);
130         return 0;
131 }
132
133 static struct platform_driver co_cache_error_driver = {
134         .probe = co_cache_error_probe,
135         .remove = co_cache_error_remove,
136         .driver = {
137                    .name = "octeon_pc_edac",
138         }
139 };
140 module_platform_driver(co_cache_error_driver);
141
142 MODULE_LICENSE("GPL");
143 MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");