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path: root/drivers/pci/hotplug/rpadlpar_sysfs.c
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Diffstat (limited to 'drivers/pci/hotplug/rpadlpar_sysfs.c')
-rw-r--r--drivers/pci/hotplug/rpadlpar_sysfs.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/rpadlpar_sysfs.c b/drivers/pci/hotplug/rpadlpar_sysfs.c
new file mode 100644
index 000000000..068b7810a
--- /dev/null
+++ b/drivers/pci/hotplug/rpadlpar_sysfs.c
@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Interface for Dynamic Logical Partitioning of I/O Slots on
+ * RPA-compliant PPC64 platform.
+ *
+ * John Rose <johnrose@austin.ibm.com>
+ * October 2003
+ *
+ * Copyright (C) 2003 IBM.
+ */
+#include <linux/kobject.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/pci_hotplug.h>
+#include "rpaphp.h"
+#include "rpadlpar.h"
+#include "../pci.h"
+
+#define DLPAR_KOBJ_NAME "control"
+
+/* Those two have no quotes because they are passed to __ATTR() which
+ * stringifies the argument (yuck !)
+ */
+#define ADD_SLOT_ATTR_NAME add_slot
+#define REMOVE_SLOT_ATTR_NAME remove_slot
+
+static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t nbytes)
+{
+ char drc_name[MAX_DRC_NAME_LEN];
+ char *end;
+ int rc;
+
+ if (nbytes >= MAX_DRC_NAME_LEN)
+ return 0;
+
+ strscpy(drc_name, buf, nbytes + 1);
+
+ end = strchr(drc_name, '\n');
+ if (end)
+ *end = '\0';
+
+ rc = dlpar_add_slot(drc_name);
+ if (rc)
+ return rc;
+
+ return nbytes;
+}
+
+static ssize_t add_slot_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ return sysfs_emit(buf, "0\n");
+}
+
+static ssize_t remove_slot_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t nbytes)
+{
+ char drc_name[MAX_DRC_NAME_LEN];
+ int rc;
+ char *end;
+
+ if (nbytes >= MAX_DRC_NAME_LEN)
+ return 0;
+
+ strscpy(drc_name, buf, nbytes + 1);
+
+ end = strchr(drc_name, '\n');
+ if (end)
+ *end = '\0';
+
+ rc = dlpar_remove_slot(drc_name);
+ if (rc)
+ return rc;
+
+ return nbytes;
+}
+
+static ssize_t remove_slot_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ return sysfs_emit(buf, "0\n");
+}
+
+static struct kobj_attribute add_slot_attr =
+ __ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
+
+static struct kobj_attribute remove_slot_attr =
+ __ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
+
+static struct attribute *default_attrs[] = {
+ &add_slot_attr.attr,
+ &remove_slot_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group dlpar_attr_group = {
+ .attrs = default_attrs,
+};
+
+static struct kobject *dlpar_kobj;
+
+int dlpar_sysfs_init(void)
+{
+ int error;
+
+ dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
+ &pci_slots_kset->kobj);
+ if (!dlpar_kobj)
+ return -EINVAL;
+
+ error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
+ if (error)
+ kobject_put(dlpar_kobj);
+ return error;
+}
+
+void dlpar_sysfs_exit(void)
+{
+ sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
+ kobject_put(dlpar_kobj);
+}