[mirror_ubuntu-zesty-kernel.git] / arch / ia64 / kernel / err_inject.c

/*
 * err_inject.c -
 *	1.) Inject errors to a processor.
 *	2.) Query error injection capabilities.
 * This driver along with user space code can be acting as an error
 * injection tool.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Written by: Fenghua Yu <fenghua.yu@intel.com>, Intel Corporation
 * Copyright (C) 2006, Intel Corp.  All rights reserved.
 *
 */
#include <linux/sysdev.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/cpu.h>
#include <linux/module.h>

#define ERR_INJ_DEBUG

#define ERR_DATA_BUFFER_SIZE 3 		// Three 8-byte;

#define define_one_ro(name) 						\
static SYSDEV_ATTR(name, 0444, show_##name, NULL)

#define define_one_rw(name) 						\
static SYSDEV_ATTR(name, 0644, show_##name, store_##name)

static u64 call_start[NR_CPUS];
static u64 phys_addr[NR_CPUS];
static u64 err_type_info[NR_CPUS];
static u64 err_struct_info[NR_CPUS];
static struct {
	u64 data1;
	u64 data2;
	u64 data3;
} __attribute__((__aligned__(16))) err_data_buffer[NR_CPUS];
static s64 status[NR_CPUS];
static u64 capabilities[NR_CPUS];
static u64 resources[NR_CPUS];

#define show(name) 							\
static ssize_t 								\
show_##name(struct sys_device *dev, char *buf)				\
{									\
	u32 cpu=dev->id;						\
	return sprintf(buf, "%lx\n", name[cpu]);			\
}

#define store(name)							\
static ssize_t 								\
store_##name(struct sys_device *dev, const char *buf, size_t size)	\
{									\
	unsigned int cpu=dev->id;					\
	name[cpu] = simple_strtoull(buf, NULL, 16);			\
	return size;							\
}

show(call_start)

/* It's user's responsibility to call the PAL procedure on a specific
 * processor. The cpu number in driver is only used for storing data.
 */
static ssize_t
store_call_start(struct sys_device *dev, const char *buf, size_t size)
{
	unsigned int cpu=dev->id;
	unsigned long call_start = simple_strtoull(buf, NULL, 16);

#ifdef ERR_INJ_DEBUG
	printk(KERN_DEBUG "pal_mc_err_inject for cpu%d:\n", cpu);
	printk(KERN_DEBUG "err_type_info=%lx,\n", err_type_info[cpu]);
	printk(KERN_DEBUG "err_struct_info=%lx,\n", err_struct_info[cpu]);
	printk(KERN_DEBUG "err_data_buffer=%lx, %lx, %lx.\n",
			  err_data_buffer[cpu].data1,
			  err_data_buffer[cpu].data2,
			  err_data_buffer[cpu].data3);
#endif
	switch (call_start) {
	    case 0: /* Do nothing. */
		break;
	    case 1: /* Call pal_mc_error_inject in physical mode. */
		status[cpu]=ia64_pal_mc_error_inject_phys(err_type_info[cpu],
					err_struct_info[cpu],
					ia64_tpa(&err_data_buffer[cpu]),
					&capabilities[cpu],
			 		&resources[cpu]);
		break;
	    case 2: /* Call pal_mc_error_inject in virtual mode. */
		status[cpu]=ia64_pal_mc_error_inject_virt(err_type_info[cpu],
					err_struct_info[cpu],
					ia64_tpa(&err_data_buffer[cpu]),
					&capabilities[cpu],
			 		&resources[cpu]);
		break;
	    default:
		status[cpu] = -EINVAL;
		break;
	}

#ifdef ERR_INJ_DEBUG
	printk(KERN_DEBUG "Returns: status=%d,\n", (int)status[cpu]);
	printk(KERN_DEBUG "capapbilities=%lx,\n", capabilities[cpu]);
	printk(KERN_DEBUG "resources=%lx\n", resources[cpu]);
#endif
	return size;
}

show(err_type_info)
store(err_type_info)

static ssize_t
show_virtual_to_phys(struct sys_device *dev, char *buf)
{
	unsigned int cpu=dev->id;
	return sprintf(buf, "%lx\n", phys_addr[cpu]);
}

static ssize_t
store_virtual_to_phys(struct sys_device *dev, const char *buf, size_t size)
{
	unsigned int cpu=dev->id;
	u64 virt_addr=simple_strtoull(buf, NULL, 16);
	int ret;

        ret = get_user_pages(current, current->mm, virt_addr,
                        1, VM_READ, 0, NULL, NULL);
	if (ret<=0) {
#ifdef ERR_INJ_DEBUG
		printk("Virtual address %lx is not existing.\n",virt_addr);
#endif
		return -EINVAL;
	}

	phys_addr[cpu] = ia64_tpa(virt_addr);
	return size;
}

show(err_struct_info)
store(err_struct_info)

static ssize_t
show_err_data_buffer(struct sys_device *dev, char *buf)
{
	unsigned int cpu=dev->id;

	return sprintf(buf, "%lx, %lx, %lx\n",
			err_data_buffer[cpu].data1,
			err_data_buffer[cpu].data2,
			err_data_buffer[cpu].data3);
}

static ssize_t
store_err_data_buffer(struct sys_device *dev, const char *buf, size_t size)
{
	unsigned int cpu=dev->id;
	int ret;

#ifdef ERR_INJ_DEBUG
	printk("write err_data_buffer=[%lx,%lx,%lx] on cpu%d\n",
		 err_data_buffer[cpu].data1,
		 err_data_buffer[cpu].data2,
		 err_data_buffer[cpu].data3,
		 cpu);
#endif
	ret=sscanf(buf, "%lx, %lx, %lx",
			&err_data_buffer[cpu].data1,
			&err_data_buffer[cpu].data2,
			&err_data_buffer[cpu].data3);
	if (ret!=ERR_DATA_BUFFER_SIZE)
		return -EINVAL;

	return size;
}

show(status)
show(capabilities)
show(resources)

define_one_rw(call_start);
define_one_rw(err_type_info);
define_one_rw(err_struct_info);
define_one_rw(err_data_buffer);
define_one_rw(virtual_to_phys);
define_one_ro(status);
define_one_ro(capabilities);
define_one_ro(resources);

static struct attribute *default_attrs[] = {
	&attr_call_start.attr,
	&attr_virtual_to_phys.attr,
	&attr_err_type_info.attr,
	&attr_err_struct_info.attr,
	&attr_err_data_buffer.attr,
	&attr_status.attr,
	&attr_capabilities.attr,
	&attr_resources.attr,
	NULL
};

static struct attribute_group err_inject_attr_group = {
	.attrs = default_attrs,
	.name = "err_inject"
};
/* Add/Remove err_inject interface for CPU device */
static int __cpuinit err_inject_add_dev(struct sys_device * sys_dev)
{
	return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group);
}

static int __cpuinit err_inject_remove_dev(struct sys_device * sys_dev)
{
	sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
	return 0;
}
static int __cpuinit err_inject_cpu_callback(struct notifier_block *nfb,
		unsigned long action, void *hcpu)
{
	unsigned int cpu = (unsigned long)hcpu;
	struct sys_device *sys_dev;

	sys_dev = get_cpu_sysdev(cpu);
	switch (action) {
	case CPU_ONLINE:
	case CPU_ONLINE_FROZEN:
		err_inject_add_dev(sys_dev);
		break;
	case CPU_DEAD:
	case CPU_DEAD_FROZEN:
		err_inject_remove_dev(sys_dev);
		break;
	}

	return NOTIFY_OK;
}

static struct notifier_block __cpuinitdata err_inject_cpu_notifier =
{
	.notifier_call = err_inject_cpu_callback,
};

static int __init
err_inject_init(void)
{
	int i;

#ifdef ERR_INJ_DEBUG
	printk(KERN_INFO "Enter error injection driver.\n");
#endif
	for_each_online_cpu(i) {
		err_inject_cpu_callback(&err_inject_cpu_notifier, CPU_ONLINE,
				(void *)(long)i);
	}

	register_hotcpu_notifier(&err_inject_cpu_notifier);

	return 0;
}

static void __exit
err_inject_exit(void)
{
	int i;
	struct sys_device *sys_dev;

#ifdef ERR_INJ_DEBUG
	printk(KERN_INFO "Exit error injection driver.\n");
#endif
	for_each_online_cpu(i) {
		sys_dev = get_cpu_sysdev(i);
		sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
	}
	unregister_hotcpu_notifier(&err_inject_cpu_notifier);
}

module_init(err_inject_init);
module_exit(err_inject_exit);

MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>");
MODULE_DESCRIPTION("MC error injection kenrel sysfs interface");
MODULE_LICENSE("GPL");
Commit	Line	Data
62fa562a FY	1	/*
	2	* err_inject.c -
	3	* 1.) Inject errors to a processor.
	4	* 2.) Query error injection capabilities.
	5	* This driver along with user space code can be acting as an error
	6	* injection tool.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	16	* NON INFRINGEMENT. See the GNU General Public License for more
	17	* details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*
	23	* Written by: Fenghua Yu <fenghua.yu@intel.com>, Intel Corporation
	24	* Copyright (C) 2006, Intel Corp. All rights reserved.
	25	*
	26	*/
	27	#include <linux/sysdev.h>
	28	#include <linux/init.h>
	29	#include <linux/mm.h>
	30	#include <linux/cpu.h>
	31	#include <linux/module.h>
	32
	33	#define ERR_INJ_DEBUG
	34
	35	#define ERR_DATA_BUFFER_SIZE 3 // Three 8-byte;
	36
	37	#define define_one_ro(name) \
	38	static SYSDEV_ATTR(name, 0444, show_##name, NULL)
	39
	40	#define define_one_rw(name) \
	41	static SYSDEV_ATTR(name, 0644, show_##name, store_##name)
	42
	43	static u64 call_start[NR_CPUS];
	44	static u64 phys_addr[NR_CPUS];
	45	static u64 err_type_info[NR_CPUS];
	46	static u64 err_struct_info[NR_CPUS];
	47	static struct {
	48	u64 data1;
	49	u64 data2;
	50	u64 data3;
	51	} __attribute__((__aligned__(16))) err_data_buffer[NR_CPUS];
	52	static s64 status[NR_CPUS];
	53	static u64 capabilities[NR_CPUS];
	54	static u64 resources[NR_CPUS];
	55
	56	#define show(name) \
	57	static ssize_t \
	58	show_##name(struct sys_device dev, char buf) \
	59	{ \
	60	u32 cpu=dev->id; \
	61	return sprintf(buf, "%lx\n", name[cpu]); \
	62	}
	63
	64	#define store(name) \
65	static ssize_t \
66	store_##name(struct sys_device dev, const char buf, size_t size) \
67	{ \
68	unsigned int cpu=dev->id; \
69	name[cpu] = simple_strtoull(buf, NULL, 16); \
70	return size; \
71	}
72
73	show(call_start)
74
75	/* It's user's responsibility to call the PAL procedure on a specific
76	* processor. The cpu number in driver is only used for storing data.
77	*/
78	static ssize_t
79	store_call_start(struct sys_device dev, const char buf, size_t size)
80	{
81	unsigned int cpu=dev->id;
82	unsigned long call_start = simple_strtoull(buf, NULL, 16);
83
84	#ifdef ERR_INJ_DEBUG
85	printk(KERN_DEBUG "pal_mc_err_inject for cpu%d:\n", cpu);
86	printk(KERN_DEBUG "err_type_info=%lx,\n", err_type_info[cpu]);
87	printk(KERN_DEBUG "err_struct_info=%lx,\n", err_struct_info[cpu]);
88	printk(KERN_DEBUG "err_data_buffer=%lx, %lx, %lx.\n",
89	err_data_buffer[cpu].data1,
90	err_data_buffer[cpu].data2,
91	err_data_buffer[cpu].data3);
92	#endif
93	switch (call_start) {
94	case 0: /* Do nothing. */
95	break;
96	case 1: /* Call pal_mc_error_inject in physical mode. */
97	status[cpu]=ia64_pal_mc_error_inject_phys(err_type_info[cpu],
98	err_struct_info[cpu],
99	ia64_tpa(&err_data_buffer[cpu]),
100	&capabilities[cpu],
101	&resources[cpu]);
102	break;
103	case 2: /* Call pal_mc_error_inject in virtual mode. */
104	status[cpu]=ia64_pal_mc_error_inject_virt(err_type_info[cpu],
105	err_struct_info[cpu],
106	ia64_tpa(&err_data_buffer[cpu]),
107	&capabilities[cpu],
108	&resources[cpu]);
109	break;
110	default:
111	status[cpu] = -EINVAL;
112	break;
113	}
114
115	#ifdef ERR_INJ_DEBUG
116	printk(KERN_DEBUG "Returns: status=%d,\n", (int)status[cpu]);
117	printk(KERN_DEBUG "capapbilities=%lx,\n", capabilities[cpu]);
118	printk(KERN_DEBUG "resources=%lx\n", resources[cpu]);
119	#endif
120	return size;
121	}
122
123	show(err_type_info)
124	store(err_type_info)
125
126	static ssize_t
127	show_virtual_to_phys(struct sys_device dev, char buf)
128	{
129	unsigned int cpu=dev->id;
130	return sprintf(buf, "%lx\n", phys_addr[cpu]);
131	}
132
133	static ssize_t
134	store_virtual_to_phys(struct sys_device dev, const char buf, size_t size)
135	{
136	unsigned int cpu=dev->id;
137	u64 virt_addr=simple_strtoull(buf, NULL, 16);
138	int ret;
139
140	ret = get_user_pages(current, current->mm, virt_addr,
141	1, VM_READ, 0, NULL, NULL);
142	if (ret<=0) {
143	#ifdef ERR_INJ_DEBUG
144	printk("Virtual address %lx is not existing.\n",virt_addr);
145	#endif
146	return -EINVAL;
147	}
148
149	phys_addr[cpu] = ia64_tpa(virt_addr);
150	return size;
151	}
152
153	show(err_struct_info)
154	store(err_struct_info)
155
156	static ssize_t
157	show_err_data_buffer(struct sys_device dev, char buf)
158	{
159	unsigned int cpu=dev->id;
160
161	return sprintf(buf, "%lx, %lx, %lx\n",
162	err_data_buffer[cpu].data1,
163	err_data_buffer[cpu].data2,
164	err_data_buffer[cpu].data3);
165	}
166
167	static ssize_t
168	store_err_data_buffer(struct sys_device dev, const char buf, size_t size)
169	{
170	unsigned int cpu=dev->id;
171	int ret;
172
173	#ifdef ERR_INJ_DEBUG
174	printk("write err_data_buffer=[%lx,%lx,%lx] on cpu%d\n",
175	err_data_buffer[cpu].data1,
176	err_data_buffer[cpu].data2,
177	err_data_buffer[cpu].data3,
178	cpu);
179	#endif
180	ret=sscanf(buf, "%lx, %lx, %lx",
181	&err_data_buffer[cpu].data1,
182	&err_data_buffer[cpu].data2,
183	&err_data_buffer[cpu].data3);
184	if (ret!=ERR_DATA_BUFFER_SIZE)
185	return -EINVAL;
186
187	return size;
188	}
189
190	show(status)
191	show(capabilities)
192	show(resources)
193
194	define_one_rw(call_start);
195	define_one_rw(err_type_info);
196	define_one_rw(err_struct_info);
197	define_one_rw(err_data_buffer);
198	define_one_rw(virtual_to_phys);
199	define_one_ro(status);
200	define_one_ro(capabilities);
201	define_one_ro(resources);
202
203	static struct attribute *default_attrs[] = {
204	&attr_call_start.attr,
205	&attr_virtual_to_phys.attr,
206	&attr_err_type_info.attr,
207	&attr_err_struct_info.attr,
208	&attr_err_data_buffer.attr,
209	&attr_status.attr,
210	&attr_capabilities.attr,
211	&attr_resources.attr,
212	NULL
213	};
214
215	static struct attribute_group err_inject_attr_group = {
216	.attrs = default_attrs,
217	.name = "err_inject"
218	};
219	/* Add/Remove err_inject interface for CPU device */
220	static int __cpuinit err_inject_add_dev(struct sys_device * sys_dev)
221	{
222	return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group);
223	}
224
225	static int __cpuinit err_inject_remove_dev(struct sys_device * sys_dev)
226	{
227	sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
228	return 0;
229	}
230	static int __cpuinit err_inject_cpu_callback(struct notifier_block *nfb,
231	unsigned long action, void *hcpu)
232	{
233	unsigned int cpu = (unsigned long)hcpu;
234	struct sys_device *sys_dev;
235
236	sys_dev = get_cpu_sysdev(cpu);
237	switch (action) {
238	case CPU_ONLINE:
8bb78442	239	case CPU_ONLINE_FROZEN:
62fa562a FY	240	err_inject_add_dev(sys_dev);
	241	break;
	242	case CPU_DEAD:
8bb78442	243	case CPU_DEAD_FROZEN:
62fa562a FY	244	err_inject_remove_dev(sys_dev);
	245	break;
	246	}
	247
	248	return NOTIFY_OK;
	249	}
	250
	251	static struct notifier_block __cpuinitdata err_inject_cpu_notifier =
	252	{
	253	.notifier_call = err_inject_cpu_callback,
	254	};
	255
	256	static int __init
	257	err_inject_init(void)
	258	{
	259	int i;
	260
	261	#ifdef ERR_INJ_DEBUG
	262	printk(KERN_INFO "Enter error injection driver.\n");
	263	#endif
	264	for_each_online_cpu(i) {
	265	err_inject_cpu_callback(&err_inject_cpu_notifier, CPU_ONLINE,
	266	(void *)(long)i);
	267	}
	268
	269	register_hotcpu_notifier(&err_inject_cpu_notifier);
	270
	271	return 0;
	272	}
	273
	274	static void __exit
	275	err_inject_exit(void)
	276	{
	277	int i;
	278	struct sys_device *sys_dev;
	279
	280	#ifdef ERR_INJ_DEBUG
	281	printk(KERN_INFO "Exit error injection driver.\n");
	282	#endif
	283	for_each_online_cpu(i) {
	284	sys_dev = get_cpu_sysdev(i);
	285	sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
	286	}
	287	unregister_hotcpu_notifier(&err_inject_cpu_notifier);
	288	}
	289
	290	module_init(err_inject_init);
	291	module_exit(err_inject_exit);
	292
	293	MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>");
	294	MODULE_DESCRIPTION("MC error injection kenrel sysfs interface");
	295	MODULE_LICENSE("GPL");