![Sebastian Andrzej Siewior](/assets/img/avatar_default.png)
Install the callbacks via the state machine and let the core invoke the callbacks on the already online CPUs. The removal of the files happens now in the prepare down stage as there is no reason to keep them around until the cpu has actually died. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: linux-ia64@vger.kernel.org Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20161103145021.28528-15-bigeasy@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
274 lines
7 KiB
C
274 lines
7 KiB
C
/*
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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, "%lx\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=%lx,\n", err_type_info[cpu]);
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printk(KERN_DEBUG "err_struct_info=%lx,\n", err_struct_info[cpu]);
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printk(KERN_DEBUG "err_data_buffer=%lx, %lx, %lx.\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 "capapbilities=%lx,\n", capabilities[cpu]);
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printk(KERN_DEBUG "resources=%lx\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, "%lx\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(virt_addr, 1, FOLL_WRITE, NULL, NULL);
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if (ret<=0) {
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#ifdef ERR_INJ_DEBUG
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printk("Virtual address %lx 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, "%lx, %lx, %lx\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=[%lx,%lx,%lx] 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, "%lx, %lx, %lx",
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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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