1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * Interface for Dynamic Logical Partitioning of I/O Slots on |
4 | * RPA-compliant PPC64 platform. |
5 | * |
6 | * John Rose <johnrose@austin.ibm.com> |
7 | * October 2003 |
8 | * |
9 | * Copyright (C) 2003 IBM. |
10 | */ |
11 | #include <linux/kobject.h> |
12 | #include <linux/string.h> |
13 | #include <linux/pci.h> |
14 | #include <linux/pci_hotplug.h> |
15 | #include "rpaphp.h" |
16 | #include "rpadlpar.h" |
17 | #include "../pci.h" |
18 | |
19 | #define DLPAR_KOBJ_NAME "control" |
20 | |
21 | /* Those two have no quotes because they are passed to __ATTR() which |
22 | * stringifies the argument (yuck !) |
23 | */ |
24 | #define ADD_SLOT_ATTR_NAME add_slot |
25 | #define REMOVE_SLOT_ATTR_NAME remove_slot |
26 | |
27 | static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr, |
28 | const char *buf, size_t nbytes) |
29 | { |
30 | char drc_name[MAX_DRC_NAME_LEN]; |
31 | char *end; |
32 | int rc; |
33 | |
34 | if (nbytes >= MAX_DRC_NAME_LEN) |
35 | return 0; |
36 | |
37 | strscpy(drc_name, buf, nbytes + 1); |
38 | |
39 | end = strchr(drc_name, '\n'); |
40 | if (end) |
41 | *end = '\0'; |
42 | |
43 | rc = dlpar_add_slot(drc_name); |
44 | if (rc) |
45 | return rc; |
46 | |
47 | return nbytes; |
48 | } |
49 | |
50 | static ssize_t add_slot_show(struct kobject *kobj, |
51 | struct kobj_attribute *attr, char *buf) |
52 | { |
53 | return sysfs_emit(buf, fmt: "0\n" ); |
54 | } |
55 | |
56 | static ssize_t remove_slot_store(struct kobject *kobj, |
57 | struct kobj_attribute *attr, |
58 | const char *buf, size_t nbytes) |
59 | { |
60 | char drc_name[MAX_DRC_NAME_LEN]; |
61 | int rc; |
62 | char *end; |
63 | |
64 | if (nbytes >= MAX_DRC_NAME_LEN) |
65 | return 0; |
66 | |
67 | strscpy(drc_name, buf, nbytes + 1); |
68 | |
69 | end = strchr(drc_name, '\n'); |
70 | if (end) |
71 | *end = '\0'; |
72 | |
73 | rc = dlpar_remove_slot(drc_name); |
74 | if (rc) |
75 | return rc; |
76 | |
77 | return nbytes; |
78 | } |
79 | |
80 | static ssize_t remove_slot_show(struct kobject *kobj, |
81 | struct kobj_attribute *attr, char *buf) |
82 | { |
83 | return sysfs_emit(buf, fmt: "0\n" ); |
84 | } |
85 | |
86 | static struct kobj_attribute add_slot_attr = |
87 | __ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store); |
88 | |
89 | static struct kobj_attribute remove_slot_attr = |
90 | __ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store); |
91 | |
92 | static struct attribute *default_attrs[] = { |
93 | &add_slot_attr.attr, |
94 | &remove_slot_attr.attr, |
95 | NULL, |
96 | }; |
97 | |
98 | static const struct attribute_group dlpar_attr_group = { |
99 | .attrs = default_attrs, |
100 | }; |
101 | |
102 | static struct kobject *dlpar_kobj; |
103 | |
104 | int dlpar_sysfs_init(void) |
105 | { |
106 | int error; |
107 | |
108 | dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME, |
109 | parent: &pci_slots_kset->kobj); |
110 | if (!dlpar_kobj) |
111 | return -EINVAL; |
112 | |
113 | error = sysfs_create_group(kobj: dlpar_kobj, grp: &dlpar_attr_group); |
114 | if (error) |
115 | kobject_put(kobj: dlpar_kobj); |
116 | return error; |
117 | } |
118 | |
119 | void dlpar_sysfs_exit(void) |
120 | { |
121 | sysfs_remove_group(kobj: dlpar_kobj, grp: &dlpar_attr_group); |
122 | kobject_put(kobj: dlpar_kobj); |
123 | } |
124 | |