LXR linux/drivers/edac/octeon

   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
  23extern int register_co_cache_error_notifier(struct notifier_block *nb);
  24extern int unregister_co_cache_error_notifier(struct notifier_block *nb);
  25
  26extern unsigned long long cache_err_dcache[NR_CPUS];
  27
  28struct 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 */
  38static 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
  84static 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
 116err1:
 117        edac_device_free_ctl_info(p->ed);
 118err:
 119        return -ENXIO;
 120}
 121
 122static 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
 132static 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};
 139module_platform_driver(co_cache_error_driver);
 140
 141MODULE_LICENSE("GPL");
 142MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");
 143