1 /*
2  * Interface for Dynamic Logical Partitioning of I/O Slots on
3  * RPA-compliant PPC64 platform.
4  *
5  * John Rose <johnrose@austin.ibm.com>
6  * October 2003
7  *
8  * Copyright (C) 2003 IBM.
9  *
10  *      This program is free software; you can redistribute it and/or
11  *      modify it under the terms of the GNU General Public License
12  *      as published by the Free Software Foundation; either version
13  *      2 of the License, or (at your option) any later version.
14  */
15 #include <linux/kobject.h>
16 #include <linux/string.h>
17 #include <linux/pci.h>
18 #include <linux/pci_hotplug.h>
19 #include "rpadlpar.h"
20 #include "../pci.h"
21 
22 #define DLPAR_KOBJ_NAME       "control"
23 
24 /* Those two have no quotes because they are passed to __ATTR() which
25  * stringifies the argument (yuck !)
26  */
27 #define ADD_SLOT_ATTR_NAME    add_slot
28 #define REMOVE_SLOT_ATTR_NAME remove_slot
29 
30 #define MAX_DRC_NAME_LEN 64
31 
32 static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
33 			      const char *buf, size_t nbytes)
34 {
35 	char drc_name[MAX_DRC_NAME_LEN];
36 	char *end;
37 	int rc;
38 
39 	if (nbytes >= MAX_DRC_NAME_LEN)
40 		return 0;
41 
42 	memcpy(drc_name, buf, nbytes);
43 
44 	end = strchr(drc_name, '\n');
45 	if (!end)
46 		end = &drc_name[nbytes];
47 	*end = '\0';
48 
49 	rc = dlpar_add_slot(drc_name);
50 	if (rc)
51 		return rc;
52 
53 	return nbytes;
54 }
55 
56 static ssize_t add_slot_show(struct kobject *kobj,
57 			     struct kobj_attribute *attr, char *buf)
58 {
59 	return sprintf(buf, "0\n");
60 }
61 
62 static ssize_t remove_slot_store(struct kobject *kobj,
63 				 struct kobj_attribute *attr,
64 				 const char *buf, size_t nbytes)
65 {
66 	char drc_name[MAX_DRC_NAME_LEN];
67 	int rc;
68 	char *end;
69 
70 	if (nbytes >= MAX_DRC_NAME_LEN)
71 		return 0;
72 
73 	memcpy(drc_name, buf, nbytes);
74 
75 	end = strchr(drc_name, '\n');
76 	if (!end)
77 		end = &drc_name[nbytes];
78 	*end = '\0';
79 
80 	rc = dlpar_remove_slot(drc_name);
81 	if (rc)
82 		return rc;
83 
84 	return nbytes;
85 }
86 
87 static ssize_t remove_slot_show(struct kobject *kobj,
88 				struct kobj_attribute *attr, char *buf)
89 {
90 	return sprintf(buf, "0\n");
91 }
92 
93 static struct kobj_attribute add_slot_attr =
94 	__ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
95 
96 static struct kobj_attribute remove_slot_attr =
97 	__ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
98 
99 static struct attribute *default_attrs[] = {
100 	&add_slot_attr.attr,
101 	&remove_slot_attr.attr,
102 	NULL,
103 };
104 
105 static struct attribute_group dlpar_attr_group = {
106 	.attrs = default_attrs,
107 };
108 
109 static struct kobject *dlpar_kobj;
110 
111 int dlpar_sysfs_init(void)
112 {
113 	int error;
114 
115 	dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
116 					    &pci_slots_kset->kobj);
117 	if (!dlpar_kobj)
118 		return -EINVAL;
119 
120 	error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
121 	if (error)
122 		kobject_put(dlpar_kobj);
123 	return error;
124 }
125 
126 void dlpar_sysfs_exit(void)
127 {
128 	sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
129 	kobject_put(dlpar_kobj);
130 }
131