linux/drivers/edac/octeon_edac-pc.c
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   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
  24extern int register_co_cache_error_notifier(struct notifier_block *nb);
  25extern int unregister_co_cache_error_notifier(struct notifier_block *nb);
  26
  27extern unsigned long long cache_err_dcache[NR_CPUS];
  28
  29struct 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 */
  39static 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_MODEL(OCTEON_FAM_2))
  77                        write_octeon_c0_dcacheerr(1);
  78                else
  79                        write_octeon_c0_dcacheerr(0);
  80        }
  81
  82        return NOTIFY_STOP;
  83}
  84
  85static 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
 117err1:
 118        edac_device_free_ctl_info(p->ed);
 119err:
 120        return -ENXIO;
 121}
 122
 123static 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
 133static 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};
 140module_platform_driver(co_cache_error_driver);
 141
 142MODULE_LICENSE("GPL");
 143MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");
 144
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