cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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octeon_edac-pc.c (3538B)

      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>");