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_module.h"
  19
  20 #include <asm/octeon/cvmx.h>
  21 #include <asm/mipsregs.h>
  22
  23 extern int register_co_cache_error_notifier(struct notifier_block *nb);
  24 extern int unregister_co_cache_error_notifier(struct notifier_block *nb);
  25
  26 extern unsigned long long cache_err_dcache[NR_CPUS];
  27
  28 struct co_cache_error {
  29         struct notifier_block notifier;
  30         struct edac_device_ctl_info *ed;
  31 };
  32
  33 /**
  34  * EDAC CPU cache error callback
  35  *
  36  * @event: non-zero if unrecoverable.
  37  */
  38 static int  co_cache_error_event(struct notifier_block *this,
  39         unsigned long event, void *ptr)
  40 {
  41         struct co_cache_error *p = container_of(this, struct co_cache_error,
  42                                                 notifier);
  43
  44         unsigned int core = cvmx_get_core_num();
  45         unsigned int cpu = smp_processor_id();
  46         u64 icache_err = read_octeon_c0_icacheerr();
  47         u64 dcache_err;
  48
  49         if (event) {
  50                 dcache_err = cache_err_dcache[core];
  51                 cache_err_dcache[core] = 0;
  52         } else {
  53                 dcache_err = read_octeon_c0_dcacheerr();
  54         }
  55
  56         if (icache_err & 1) {
  57                 edac_device_printk(p->ed, KERN_ERR,
  58                                    "CacheErr (Icache):%llx, core %d/cpu %d, cp0_errorepc == %lx\n",
  59                                    (unsigned long long)icache_err, core, cpu,
  60                                    read_c0_errorepc());
  61                 write_octeon_c0_icacheerr(0);
  62                 edac_device_handle_ce(p->ed, cpu, 1, "icache");
  63         }
  64         if (dcache_err & 1) {
  65                 edac_device_printk(p->ed, KERN_ERR,
  66                                    "CacheErr (Dcache):%llx, core %d/cpu %d, cp0_errorepc == %lx\n",
  67                                    (unsigned long long)dcache_err, core, cpu,
  68                                    read_c0_errorepc());
  69                 if (event)
  70                         edac_device_handle_ue(p->ed, cpu, 0, "dcache");
  71                 else
  72                         edac_device_handle_ce(p->ed, cpu, 0, "dcache");
  73
  74                 /* Clear the error indication */
  75                 if (OCTEON_IS_OCTEON2())
  76                         write_octeon_c0_dcacheerr(1);
  77                 else
  78                         write_octeon_c0_dcacheerr(0);
  79         }
  80
  81         return NOTIFY_STOP;
  82 }
  83
  84 static int co_cache_error_probe(struct platform_device *pdev)
  85 {
  86         struct co_cache_error *p = devm_kzalloc(&pdev->dev, sizeof(*p),
  87                                                 GFP_KERNEL);
  88         if (!p)
  89                 return -ENOMEM;
  90
  91         p->notifier.notifier_call = co_cache_error_event;
  92         platform_set_drvdata(pdev, p);
  93
  94         p->ed = edac_device_alloc_ctl_info(0, "cpu", num_possible_cpus(),
  95                                            "cache", 2, 0, NULL, 0,
  96                                            edac_device_alloc_index());
  97         if (!p->ed)
  98                 goto err;
  99
 100         p->ed->dev = &pdev->dev;
 101
 102         p->ed->dev_name = dev_name(&pdev->dev);
 103
 104         p->ed->mod_name = "octeon-cpu";
 105         p->ed->ctl_name = "cache";
 106
 107         if (edac_device_add_device(p->ed)) {
 108                 pr_err("%s: edac_device_add_device() failed\n", __func__);
 109                 goto err1;
 110         }
 111
 112         register_co_cache_error_notifier(&p->notifier);
 113
 114         return 0;
 115
 116 err1:
 117         edac_device_free_ctl_info(p->ed);
 118 err:
 119         return -ENXIO;
 120 }
 121
 122 static int co_cache_error_remove(struct platform_device *pdev)
 123 {
 124         struct co_cache_error *p = platform_get_drvdata(pdev);
 125
 126         unregister_co_cache_error_notifier(&p->notifier);
 127         edac_device_del_device(&pdev->dev);
 128         edac_device_free_ctl_info(p->ed);
 129         return 0;
 130 }
 131
 132 static struct platform_driver co_cache_error_driver = {
 133         .probe = co_cache_error_probe,
 134         .remove = co_cache_error_remove,
 135         .driver = {
 136                    .name = "octeon_pc_edac",
 137         }
 138 };
 139 module_platform_driver(co_cache_error_driver);
 140
 141 MODULE_LICENSE("GPL");
 142 MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");