274 lines
7 KiB
C
274 lines
7 KiB
C
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/*
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* err_inject.c -
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* 1.) Inject errors to a processor.
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* 2.) Query error injection capabilities.
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* This driver along with user space code can be acting as an error
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* injection tool.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Written by: Fenghua Yu <fenghua.yu@intel.com>, Intel Corporation
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* Copyright (C) 2006, Intel Corp. All rights reserved.
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*
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*/
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/cpu.h>
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#include <linux/module.h>
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#define ERR_INJ_DEBUG
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#define ERR_DATA_BUFFER_SIZE 3 // Three 8-byte;
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#define define_one_ro(name) \
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static DEVICE_ATTR(name, 0444, show_##name, NULL)
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#define define_one_rw(name) \
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static DEVICE_ATTR(name, 0644, show_##name, store_##name)
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static u64 call_start[NR_CPUS];
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static u64 phys_addr[NR_CPUS];
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static u64 err_type_info[NR_CPUS];
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static u64 err_struct_info[NR_CPUS];
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static struct {
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u64 data1;
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u64 data2;
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u64 data3;
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} __attribute__((__aligned__(16))) err_data_buffer[NR_CPUS];
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static s64 status[NR_CPUS];
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static u64 capabilities[NR_CPUS];
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static u64 resources[NR_CPUS];
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#define show(name) \
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static ssize_t \
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show_##name(struct device *dev, struct device_attribute *attr, \
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char *buf) \
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{ \
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u32 cpu=dev->id; \
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return sprintf(buf, "%llx\n", name[cpu]); \
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}
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#define store(name) \
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static ssize_t \
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store_##name(struct device *dev, struct device_attribute *attr, \
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const char *buf, size_t size) \
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{ \
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unsigned int cpu=dev->id; \
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name[cpu] = simple_strtoull(buf, NULL, 16); \
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return size; \
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}
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show(call_start)
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/* It's user's responsibility to call the PAL procedure on a specific
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* processor. The cpu number in driver is only used for storing data.
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*/
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static ssize_t
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store_call_start(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t size)
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{
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unsigned int cpu=dev->id;
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unsigned long call_start = simple_strtoull(buf, NULL, 16);
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#ifdef ERR_INJ_DEBUG
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printk(KERN_DEBUG "pal_mc_err_inject for cpu%d:\n", cpu);
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printk(KERN_DEBUG "err_type_info=%llx,\n", err_type_info[cpu]);
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printk(KERN_DEBUG "err_struct_info=%llx,\n", err_struct_info[cpu]);
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printk(KERN_DEBUG "err_data_buffer=%llx, %llx, %llx.\n",
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err_data_buffer[cpu].data1,
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err_data_buffer[cpu].data2,
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err_data_buffer[cpu].data3);
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#endif
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switch (call_start) {
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case 0: /* Do nothing. */
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break;
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case 1: /* Call pal_mc_error_inject in physical mode. */
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status[cpu]=ia64_pal_mc_error_inject_phys(err_type_info[cpu],
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err_struct_info[cpu],
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ia64_tpa(&err_data_buffer[cpu]),
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&capabilities[cpu],
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&resources[cpu]);
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break;
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case 2: /* Call pal_mc_error_inject in virtual mode. */
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status[cpu]=ia64_pal_mc_error_inject_virt(err_type_info[cpu],
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err_struct_info[cpu],
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ia64_tpa(&err_data_buffer[cpu]),
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&capabilities[cpu],
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&resources[cpu]);
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break;
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default:
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status[cpu] = -EINVAL;
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break;
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}
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#ifdef ERR_INJ_DEBUG
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printk(KERN_DEBUG "Returns: status=%d,\n", (int)status[cpu]);
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printk(KERN_DEBUG "capabilities=%llx,\n", capabilities[cpu]);
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printk(KERN_DEBUG "resources=%llx\n", resources[cpu]);
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#endif
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return size;
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}
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show(err_type_info)
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store(err_type_info)
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static ssize_t
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show_virtual_to_phys(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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unsigned int cpu=dev->id;
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return sprintf(buf, "%llx\n", phys_addr[cpu]);
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}
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static ssize_t
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store_virtual_to_phys(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t size)
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{
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unsigned int cpu=dev->id;
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u64 virt_addr=simple_strtoull(buf, NULL, 16);
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int ret;
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ret = get_user_pages_fast(virt_addr, 1, FOLL_WRITE, NULL);
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if (ret<=0) {
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#ifdef ERR_INJ_DEBUG
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printk("Virtual address %llx is not existing.\n", virt_addr);
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#endif
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return -EINVAL;
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}
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phys_addr[cpu] = ia64_tpa(virt_addr);
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return size;
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}
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show(err_struct_info)
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store(err_struct_info)
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static ssize_t
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show_err_data_buffer(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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unsigned int cpu=dev->id;
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return sprintf(buf, "%llx, %llx, %llx\n",
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err_data_buffer[cpu].data1,
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err_data_buffer[cpu].data2,
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err_data_buffer[cpu].data3);
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}
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static ssize_t
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store_err_data_buffer(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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unsigned int cpu=dev->id;
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int ret;
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#ifdef ERR_INJ_DEBUG
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printk("write err_data_buffer=[%llx,%llx,%llx] on cpu%d\n",
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err_data_buffer[cpu].data1,
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err_data_buffer[cpu].data2,
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err_data_buffer[cpu].data3,
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cpu);
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#endif
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ret = sscanf(buf, "%llx, %llx, %llx",
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&err_data_buffer[cpu].data1,
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&err_data_buffer[cpu].data2,
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&err_data_buffer[cpu].data3);
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if (ret!=ERR_DATA_BUFFER_SIZE)
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return -EINVAL;
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return size;
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}
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show(status)
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show(capabilities)
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show(resources)
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define_one_rw(call_start);
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define_one_rw(err_type_info);
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define_one_rw(err_struct_info);
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define_one_rw(err_data_buffer);
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define_one_rw(virtual_to_phys);
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define_one_ro(status);
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define_one_ro(capabilities);
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define_one_ro(resources);
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static struct attribute *default_attrs[] = {
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&dev_attr_call_start.attr,
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&dev_attr_virtual_to_phys.attr,
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&dev_attr_err_type_info.attr,
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&dev_attr_err_struct_info.attr,
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&dev_attr_err_data_buffer.attr,
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&dev_attr_status.attr,
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&dev_attr_capabilities.attr,
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&dev_attr_resources.attr,
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NULL
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};
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static struct attribute_group err_inject_attr_group = {
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.attrs = default_attrs,
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.name = "err_inject"
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};
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/* Add/Remove err_inject interface for CPU device */
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static int err_inject_add_dev(unsigned int cpu)
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{
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struct device *sys_dev = get_cpu_device(cpu);
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return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group);
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}
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static int err_inject_remove_dev(unsigned int cpu)
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{
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struct device *sys_dev = get_cpu_device(cpu);
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sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
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return 0;
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}
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static enum cpuhp_state hp_online;
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static int __init err_inject_init(void)
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{
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int ret;
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#ifdef ERR_INJ_DEBUG
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printk(KERN_INFO "Enter error injection driver.\n");
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#endif
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ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/err_inj:online",
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err_inject_add_dev, err_inject_remove_dev);
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if (ret >= 0) {
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hp_online = ret;
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ret = 0;
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}
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return ret;
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}
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static void __exit err_inject_exit(void)
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{
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#ifdef ERR_INJ_DEBUG
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printk(KERN_INFO "Exit error injection driver.\n");
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#endif
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cpuhp_remove_state(hp_online);
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}
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module_init(err_inject_init);
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module_exit(err_inject_exit);
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MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>");
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MODULE_DESCRIPTION("MC error injection kernel sysfs interface");
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MODULE_LICENSE("GPL");
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