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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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ccce9bb83e
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
This removes all the ia64 uses of the __cpuinit macros.
[1] https://lkml.org/lkml/2013/5/20/589
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
304 lines
7.6 KiB
C
304 lines
7.6 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(current, current->mm, virt_addr,
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1, VM_READ, 0, 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(struct device *sys_dev)
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{
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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(struct device *sys_dev)
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{
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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 int err_inject_cpu_callback(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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unsigned int cpu = (unsigned long)hcpu;
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struct device *sys_dev;
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sys_dev = get_cpu_device(cpu);
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switch (action) {
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case CPU_ONLINE:
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case CPU_ONLINE_FROZEN:
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err_inject_add_dev(sys_dev);
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break;
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case CPU_DEAD:
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case CPU_DEAD_FROZEN:
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err_inject_remove_dev(sys_dev);
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block err_inject_cpu_notifier =
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{
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.notifier_call = err_inject_cpu_callback,
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};
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static int __init
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err_inject_init(void)
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{
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int i;
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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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for_each_online_cpu(i) {
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err_inject_cpu_callback(&err_inject_cpu_notifier, CPU_ONLINE,
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(void *)(long)i);
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}
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register_hotcpu_notifier(&err_inject_cpu_notifier);
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return 0;
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}
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static void __exit
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err_inject_exit(void)
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{
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int i;
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struct device *sys_dev;
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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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for_each_online_cpu(i) {
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sys_dev = get_cpu_device(i);
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sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
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}
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unregister_hotcpu_notifier(&err_inject_cpu_notifier);
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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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