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>");