1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Interface for Dynamic Logical Partitioning of I/O Slots on
4*4882a593Smuzhiyun * RPA-compliant PPC64 platform.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * John Rose <johnrose@austin.ibm.com>
7*4882a593Smuzhiyun * October 2003
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * Copyright (C) 2003 IBM.
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun #include <linux/kobject.h>
12*4882a593Smuzhiyun #include <linux/string.h>
13*4882a593Smuzhiyun #include <linux/pci.h>
14*4882a593Smuzhiyun #include <linux/pci_hotplug.h>
15*4882a593Smuzhiyun #include "rpaphp.h"
16*4882a593Smuzhiyun #include "rpadlpar.h"
17*4882a593Smuzhiyun #include "../pci.h"
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #define DLPAR_KOBJ_NAME "control"
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun /* Those two have no quotes because they are passed to __ATTR() which
22*4882a593Smuzhiyun * stringifies the argument (yuck !)
23*4882a593Smuzhiyun */
24*4882a593Smuzhiyun #define ADD_SLOT_ATTR_NAME add_slot
25*4882a593Smuzhiyun #define REMOVE_SLOT_ATTR_NAME remove_slot
26*4882a593Smuzhiyun
add_slot_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t nbytes)27*4882a593Smuzhiyun static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
28*4882a593Smuzhiyun const char *buf, size_t nbytes)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun char drc_name[MAX_DRC_NAME_LEN];
31*4882a593Smuzhiyun char *end;
32*4882a593Smuzhiyun int rc;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun if (nbytes >= MAX_DRC_NAME_LEN)
35*4882a593Smuzhiyun return 0;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun strscpy(drc_name, buf, nbytes + 1);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun end = strchr(drc_name, '\n');
40*4882a593Smuzhiyun if (end)
41*4882a593Smuzhiyun *end = '\0';
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun rc = dlpar_add_slot(drc_name);
44*4882a593Smuzhiyun if (rc)
45*4882a593Smuzhiyun return rc;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun return nbytes;
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
add_slot_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)50*4882a593Smuzhiyun static ssize_t add_slot_show(struct kobject *kobj,
51*4882a593Smuzhiyun struct kobj_attribute *attr, char *buf)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun return sprintf(buf, "0\n");
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
remove_slot_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t nbytes)56*4882a593Smuzhiyun static ssize_t remove_slot_store(struct kobject *kobj,
57*4882a593Smuzhiyun struct kobj_attribute *attr,
58*4882a593Smuzhiyun const char *buf, size_t nbytes)
59*4882a593Smuzhiyun {
60*4882a593Smuzhiyun char drc_name[MAX_DRC_NAME_LEN];
61*4882a593Smuzhiyun int rc;
62*4882a593Smuzhiyun char *end;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun if (nbytes >= MAX_DRC_NAME_LEN)
65*4882a593Smuzhiyun return 0;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun strscpy(drc_name, buf, nbytes + 1);
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun end = strchr(drc_name, '\n');
70*4882a593Smuzhiyun if (end)
71*4882a593Smuzhiyun *end = '\0';
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun rc = dlpar_remove_slot(drc_name);
74*4882a593Smuzhiyun if (rc)
75*4882a593Smuzhiyun return rc;
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun return nbytes;
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
remove_slot_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)80*4882a593Smuzhiyun static ssize_t remove_slot_show(struct kobject *kobj,
81*4882a593Smuzhiyun struct kobj_attribute *attr, char *buf)
82*4882a593Smuzhiyun {
83*4882a593Smuzhiyun return sprintf(buf, "0\n");
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun static struct kobj_attribute add_slot_attr =
87*4882a593Smuzhiyun __ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun static struct kobj_attribute remove_slot_attr =
90*4882a593Smuzhiyun __ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun static struct attribute *default_attrs[] = {
93*4882a593Smuzhiyun &add_slot_attr.attr,
94*4882a593Smuzhiyun &remove_slot_attr.attr,
95*4882a593Smuzhiyun NULL,
96*4882a593Smuzhiyun };
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun static const struct attribute_group dlpar_attr_group = {
99*4882a593Smuzhiyun .attrs = default_attrs,
100*4882a593Smuzhiyun };
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun static struct kobject *dlpar_kobj;
103*4882a593Smuzhiyun
dlpar_sysfs_init(void)104*4882a593Smuzhiyun int dlpar_sysfs_init(void)
105*4882a593Smuzhiyun {
106*4882a593Smuzhiyun int error;
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
109*4882a593Smuzhiyun &pci_slots_kset->kobj);
110*4882a593Smuzhiyun if (!dlpar_kobj)
111*4882a593Smuzhiyun return -EINVAL;
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
114*4882a593Smuzhiyun if (error)
115*4882a593Smuzhiyun kobject_put(dlpar_kobj);
116*4882a593Smuzhiyun return error;
117*4882a593Smuzhiyun }
118*4882a593Smuzhiyun
dlpar_sysfs_exit(void)119*4882a593Smuzhiyun void dlpar_sysfs_exit(void)
120*4882a593Smuzhiyun {
121*4882a593Smuzhiyun sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
122*4882a593Smuzhiyun kobject_put(dlpar_kobj);
123*4882a593Smuzhiyun }
124