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1da177e4 LT |
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 "pci_hotplug.h" | |
18 | #include "rpadlpar.h" | |
19 | ||
20 | #define DLPAR_KOBJ_NAME "control" | |
21 | #define ADD_SLOT_ATTR_NAME "add_slot" | |
22 | #define REMOVE_SLOT_ATTR_NAME "remove_slot" | |
23 | ||
24 | #define MAX_DRC_NAME_LEN 64 | |
25 | ||
26 | /* Store return code of dlpar operation in attribute struct */ | |
27 | struct dlpar_io_attr { | |
28 | int rc; | |
29 | struct attribute attr; | |
30 | ssize_t (*store)(struct dlpar_io_attr *dlpar_attr, const char *buf, | |
31 | size_t nbytes); | |
32 | }; | |
33 | ||
34 | /* Common show callback for all attrs, display the return code | |
35 | * of the dlpar op */ | |
36 | static ssize_t | |
37 | dlpar_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) | |
38 | { | |
39 | struct dlpar_io_attr *dlpar_attr = container_of(attr, | |
40 | struct dlpar_io_attr, attr); | |
41 | return sprintf(buf, "%d\n", dlpar_attr->rc); | |
42 | } | |
43 | ||
44 | static ssize_t | |
45 | dlpar_attr_store(struct kobject * kobj, struct attribute * attr, | |
46 | const char *buf, size_t nbytes) | |
47 | { | |
48 | struct dlpar_io_attr *dlpar_attr = container_of(attr, | |
49 | struct dlpar_io_attr, attr); | |
50 | return dlpar_attr->store ? | |
51 | dlpar_attr->store(dlpar_attr, buf, nbytes) : 0; | |
52 | } | |
53 | ||
54 | static struct sysfs_ops dlpar_attr_sysfs_ops = { | |
55 | .show = dlpar_attr_show, | |
56 | .store = dlpar_attr_store, | |
57 | }; | |
58 | ||
59 | static ssize_t add_slot_store(struct dlpar_io_attr *dlpar_attr, | |
60 | const char *buf, size_t nbytes) | |
61 | { | |
62 | char drc_name[MAX_DRC_NAME_LEN]; | |
63 | char *end; | |
64 | ||
65 | if (nbytes > MAX_DRC_NAME_LEN) | |
66 | return 0; | |
67 | ||
68 | memcpy(drc_name, buf, nbytes); | |
69 | ||
70 | end = strchr(drc_name, '\n'); | |
71 | if (!end) | |
72 | end = &drc_name[nbytes]; | |
73 | *end = '\0'; | |
74 | ||
75 | dlpar_attr->rc = dlpar_add_slot(drc_name); | |
76 | ||
77 | return nbytes; | |
78 | } | |
79 | ||
80 | static ssize_t remove_slot_store(struct dlpar_io_attr *dlpar_attr, | |
81 | const char *buf, size_t nbytes) | |
82 | { | |
83 | char drc_name[MAX_DRC_NAME_LEN]; | |
84 | char *end; | |
85 | ||
86 | if (nbytes > MAX_DRC_NAME_LEN) | |
87 | return 0; | |
88 | ||
89 | memcpy(drc_name, buf, nbytes); | |
90 | ||
91 | end = strchr(drc_name, '\n'); | |
92 | if (!end) | |
93 | end = &drc_name[nbytes]; | |
94 | *end = '\0'; | |
95 | ||
96 | dlpar_attr->rc = dlpar_remove_slot(drc_name); | |
97 | ||
98 | return nbytes; | |
99 | } | |
100 | ||
101 | static struct dlpar_io_attr add_slot_attr = { | |
102 | .rc = 0, | |
103 | .attr = { .name = ADD_SLOT_ATTR_NAME, .mode = 0644, }, | |
104 | .store = add_slot_store, | |
105 | }; | |
106 | ||
107 | static struct dlpar_io_attr remove_slot_attr = { | |
108 | .rc = 0, | |
109 | .attr = { .name = REMOVE_SLOT_ATTR_NAME, .mode = 0644}, | |
110 | .store = remove_slot_store, | |
111 | }; | |
112 | ||
113 | static struct attribute *default_attrs[] = { | |
114 | &add_slot_attr.attr, | |
115 | &remove_slot_attr.attr, | |
116 | NULL, | |
117 | }; | |
118 | ||
119 | static void dlpar_io_release(struct kobject *kobj) | |
120 | { | |
121 | /* noop */ | |
122 | return; | |
123 | } | |
124 | ||
125 | struct kobj_type ktype_dlpar_io = { | |
126 | .release = dlpar_io_release, | |
127 | .sysfs_ops = &dlpar_attr_sysfs_ops, | |
128 | .default_attrs = default_attrs, | |
129 | }; | |
130 | ||
131 | struct kset dlpar_io_kset = { | |
132 | .subsys = &pci_hotplug_slots_subsys, | |
133 | .kobj = {.name = DLPAR_KOBJ_NAME, .ktype=&ktype_dlpar_io,}, | |
134 | .ktype = &ktype_dlpar_io, | |
135 | }; | |
136 | ||
137 | int dlpar_sysfs_init(void) | |
138 | { | |
139 | if (kset_register(&dlpar_io_kset)) { | |
140 | printk(KERN_ERR "rpadlpar_io: cannot register kset for %s\n", | |
141 | dlpar_io_kset.kobj.name); | |
142 | return -EINVAL; | |
143 | } | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | void dlpar_sysfs_exit(void) | |
149 | { | |
150 | kset_unregister(&dlpar_io_kset); | |
151 | } |