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) 2009 Wind River Systems,
   7  *   written by Ralf Baechle <ralf@linux-mips.org>
   8  */
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/slab.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/io.h>
  14 #include <linux/edac.h>
  15
  16 #include "edac_core.h"
  17 #include "edac_module.h"
  18
  19 #include <asm/octeon/cvmx.h>
  20 #include <asm/mipsregs.h>
  21
  22 #define EDAC_MOD_STR "octeon"
  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 static struct edac_device_ctl_info *ed_cavium;
  30
  31 /*
  32  * EDAC CPU cache error callback
  33  *
  34  */
  35
  36 static int  co_cache_error_event(struct notifier_block *this,
  37         unsigned long event, void *ptr)
  38 {
  39         unsigned int core = cvmx_get_core_num();
  40         unsigned int cpu = smp_processor_id();
  41         uint64_t icache_err = read_octeon_c0_icacheerr();
  42         struct edac_device_ctl_info *ed = ed_cavium;
  43
  44         edac_device_printk(ed, KERN_ERR,
  45                            "Cache error exception on core %d / processor %d:\n",
  46                            core, cpu);
  47         edac_device_printk(ed, KERN_ERR,
  48                            "cp0_errorepc == %lx\n", read_c0_errorepc());
  49         if (icache_err & 1) {
  50                 edac_device_printk(ed, KERN_ERR, "CacheErr (Icache) == %llx\n",
  51                                    (unsigned long long)icache_err);
  52                 write_octeon_c0_icacheerr(0);
  53                 edac_device_handle_ce(ed, 0, 0, ed->ctl_name);
  54         }
  55         if (cache_err_dcache[core] & 1) {
  56                 edac_device_printk(ed, KERN_ERR, "CacheErr (Dcache) == %llx\n",
  57                                    (unsigned long long)cache_err_dcache[core]);
  58                 cache_err_dcache[core] = 0;
  59                 edac_device_handle_ue(ed, 0, 0, ed->ctl_name);
  60         }
  61
  62         return NOTIFY_DONE;
  63 }
  64
  65 static struct notifier_block co_cache_error_notifier = {
  66         .notifier_call = co_cache_error_event,
  67 };
  68
  69 static int __devinit co_cache_error_probe(struct platform_device *pdev)
  70 {
  71         struct edac_device_ctl_info *ed;
  72         int res = 0;
  73
  74         ed = edac_device_alloc_ctl_info(0, "cpu", 1, NULL, 0, 0, NULL, 0,
  75                                         edac_device_alloc_index());
  76
  77         ed->dev = &pdev->dev;
  78         platform_set_drvdata(pdev, ed);
  79         ed->dev_name = dev_name(&pdev->dev);
  80
  81         ed->mod_name = "octeon-cpu";
  82         ed->ctl_name = "co_cpu_err";
  83
  84         if (edac_device_add_device(ed) > 0) {
  85                 pr_err("%s: edac_device_add_device() failed\n", __func__);
  86                 goto err;
  87         }
  88
  89         register_co_cache_error_notifier(&co_cache_error_notifier);
  90         ed_cavium = ed;
  91
  92         return 0;
  93
  94 err:
  95         edac_device_free_ctl_info(ed);
  96
  97         return res;
  98 }
  99
 100 static int co_cache_error_remove(struct platform_device *pdev)
 101 {
 102         struct edac_device_ctl_info *ed = platform_get_drvdata(pdev);
 103
 104         unregister_co_cache_error_notifier(&co_cache_error_notifier);
 105         ed_cavium = NULL;
 106         edac_device_del_device(&pdev->dev);
 107         edac_device_free_ctl_info(ed);
 108
 109         return 0;
 110 }
 111
 112 static struct platform_driver co_cache_error_driver = {
 113         .probe = co_cache_error_probe,
 114         .remove = co_cache_error_remove,
 115         .driver = {
 116                    .name = "co_pc_edac",
 117         }
 118 };
 119
 120 static int __init co_edac_init(void)
 121 {
 122         int ret;
 123
 124         ret = platform_driver_register(&co_cache_error_driver);
 125         if (ret)
 126                 pr_warning(EDAC_MOD_STR "CPU err failed to register\n");
 127
 128         return ret;
 129 }
 130
 131 static void __exit co_edac_exit(void)
 132 {
 133         platform_driver_unregister(&co_cache_error_driver);
 134 }
 135
 136 module_init(co_edac_init);
 137 module_exit(co_edac_exit);
 138
 139 MODULE_LICENSE("GPL");
 140 MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");