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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2012 Cavium, Inc.
*
* Copyright (C) 2009 Wind River Systems,
* written by Ralf Baechle <ralf@linux-mips.org>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/edac.h>
#include "edac_module.h"
#include <asm/octeon/cvmx.h>
#include <asm/mipsregs.h>
extern int register_co_cache_error_notifier(struct notifier_block *nb);
extern int unregister_co_cache_error_notifier(struct notifier_block *nb);
extern unsigned long long cache_err_dcache[NR_CPUS];
struct co_cache_error {
struct notifier_block notifier;
struct edac_device_ctl_info *ed;
};
/**
* EDAC CPU cache error callback
*
* @event: non-zero if unrecoverable.
*/
static int co_cache_error_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct co_cache_error *p = container_of(this, struct co_cache_error,
notifier);
unsigned int core = cvmx_get_core_num();
unsigned int cpu = smp_processor_id();
u64 icache_err = read_octeon_c0_icacheerr();
u64 dcache_err;
if (event) {
dcache_err = cache_err_dcache[core];
cache_err_dcache[core] = 0;
} else {
dcache_err = read_octeon_c0_dcacheerr();
}
if (icache_err & 1) {
edac_device_printk(p->ed, KERN_ERR,
"CacheErr (Icache):%llx, core %d/cpu %d, cp0_errorepc == %lx\n",
(unsigned long long)icache_err, core, cpu,
read_c0_errorepc());
write_octeon_c0_icacheerr(0);
edac_device_handle_ce(p->ed, cpu, 1, "icache");
}
if (dcache_err & 1) {
edac_device_printk(p->ed, KERN_ERR,
"CacheErr (Dcache):%llx, core %d/cpu %d, cp0_errorepc == %lx\n",
(unsigned long long)dcache_err, core, cpu,
read_c0_errorepc());
if (event)
edac_device_handle_ue(p->ed, cpu, 0, "dcache");
else
edac_device_handle_ce(p->ed, cpu, 0, "dcache");
/* Clear the error indication */
if (OCTEON_IS_OCTEON2())
write_octeon_c0_dcacheerr(1);
else
write_octeon_c0_dcacheerr(0);
}
return NOTIFY_STOP;
}
static int co_cache_error_probe(struct platform_device *pdev)
{
struct co_cache_error *p = devm_kzalloc(&pdev->dev, sizeof(*p),
GFP_KERNEL);
if (!p)
return -ENOMEM;
p->notifier.notifier_call = co_cache_error_event;
platform_set_drvdata(pdev, p);
p->ed = edac_device_alloc_ctl_info(0, "cpu", num_possible_cpus(),
"cache", 2, 0, NULL, 0,
edac_device_alloc_index());
if (!p->ed)
goto err;
p->ed->dev = &pdev->dev;
p->ed->dev_name = dev_name(&pdev->dev);
p->ed->mod_name = "octeon-cpu";
p->ed->ctl_name = "cache";
if (edac_device_add_device(p->ed)) {
pr_err("%s: edac_device_add_device() failed\n", __func__);
goto err1;
}
register_co_cache_error_notifier(&p->notifier);
return 0;
err1:
edac_device_free_ctl_info(p->ed);
err:
return -ENXIO;
}
static void co_cache_error_remove(struct platform_device *pdev)
{
struct co_cache_error *p = platform_get_drvdata(pdev);
unregister_co_cache_error_notifier(&p->notifier);
edac_device_del_device(&pdev->dev);
edac_device_free_ctl_info(p->ed);
}
static struct platform_driver co_cache_error_driver = {
.probe = co_cache_error_probe,
.remove_new = co_cache_error_remove,
.driver = {
.name = "octeon_pc_edac",
}
};
module_platform_driver(co_cache_error_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");
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