pci/hotplug/rpadlpar_sysfs.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * Interface for Dynamic Logical Partitioning of I/O Slots on
0004  * RPA-compliant PPC64 platform.
0005  *
0006  * John Rose <johnrose@austin.ibm.com>
0007  * October 2003
0008  *
0009  * Copyright (C) 2003 IBM.
0010  */
0011 #include <linux/kobject.h>
0012 #include <linux/string.h>
0013 #include <linux/pci.h>
0014 #include <linux/pci_hotplug.h>
0015 #include "rpaphp.h"
0016 #include "rpadlpar.h"
0017 #include "../pci.h"
0018
0019 #define DLPAR_KOBJ_NAME       "control"
0020
0021 /* Those two have no quotes because they are passed to __ATTR() which
0022  * stringifies the argument (yuck !)
0023  */
0024 #define ADD_SLOT_ATTR_NAME    add_slot
0025 #define REMOVE_SLOT_ATTR_NAME remove_slot
0026
0027 static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
0028                   const char *buf, size_t nbytes)
0029 {
0030     char drc_name[MAX_DRC_NAME_LEN];
0031     char *end;
0032     int rc;
0033
0034     if (nbytes >= MAX_DRC_NAME_LEN)
0035         return 0;
0036
0037     strscpy(drc_name, buf, nbytes + 1);
0038
0039     end = strchr(drc_name, '\n');
0040     if (end)
0041         *end = '\0';
0042
0043     rc = dlpar_add_slot(drc_name);
0044     if (rc)
0045         return rc;
0046
0047     return nbytes;
0048 }
0049
0050 static ssize_t add_slot_show(struct kobject *kobj,
0051                  struct kobj_attribute *attr, char *buf)
0052 {
0053     return sysfs_emit(buf, "0\n");
0054 }
0055
0056 static ssize_t remove_slot_store(struct kobject *kobj,
0057                  struct kobj_attribute *attr,
0058                  const char *buf, size_t nbytes)
0059 {
0060     char drc_name[MAX_DRC_NAME_LEN];
0061     int rc;
0062     char *end;
0063
0064     if (nbytes >= MAX_DRC_NAME_LEN)
0065         return 0;
0066
0067     strscpy(drc_name, buf, nbytes + 1);
0068
0069     end = strchr(drc_name, '\n');
0070     if (end)
0071         *end = '\0';
0072
0073     rc = dlpar_remove_slot(drc_name);
0074     if (rc)
0075         return rc;
0076
0077     return nbytes;
0078 }
0079
0080 static ssize_t remove_slot_show(struct kobject *kobj,
0081                 struct kobj_attribute *attr, char *buf)
0082 {
0083     return sysfs_emit(buf, "0\n");
0084 }
0085
0086 static struct kobj_attribute add_slot_attr =
0087     __ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
0088
0089 static struct kobj_attribute remove_slot_attr =
0090     __ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
0091
0092 static struct attribute *default_attrs[] = {
0093     &add_slot_attr.attr,
0094     &remove_slot_attr.attr,
0095     NULL,
0096 };
0097
0098 static const struct attribute_group dlpar_attr_group = {
0099     .attrs = default_attrs,
0100 };
0101
0102 static struct kobject *dlpar_kobj;
0103
0104 int dlpar_sysfs_init(void)
0105 {
0106     int error;
0107
0108     dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
0109                         &pci_slots_kset->kobj);
0110     if (!dlpar_kobj)
0111         return -EINVAL;
0112
0113     error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
0114     if (error)
0115         kobject_put(dlpar_kobj);
0116     return error;
0117 }
0118
0119 void dlpar_sysfs_exit(void)
0120 {
0121     sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
0122     kobject_put(dlpar_kobj);
0123 }