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273 lines
7.0 KiB
273 lines
7.0 KiB
/* |
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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 <[email protected]>, 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 <[email protected]>"); |
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MODULE_DESCRIPTION("MC error injection kernel sysfs interface"); |
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MODULE_LICENSE("GPL");
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