Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / pci / hotplug / rpadlpar_sysfs.c

diff --git a/kernel/drivers/pci/hotplug/rpadlpar_sysfs.c b/kernel/drivers/pci/hotplug/rpadlpar_sysfs.c
new file mode 100644 (file)
index 0000000..a796301
--- /dev/null
+++ b/kernel/drivers/pci/hotplug/rpadlpar_sysfs.c
@@ -0,0 +1,130 @@
+/*
+ * 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.
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+#include <linux/kobject.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/pci_hotplug.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
+
+#define MAX_DRC_NAME_LEN 64
+
+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;
+
+       memcpy(drc_name, buf, nbytes);
+
+       end = strchr(drc_name, '\n');
+       if (!end)
+               end = &drc_name[nbytes];
+       *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 sprintf(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;
+
+       memcpy(drc_name, buf, nbytes);
+
+       end = strchr(drc_name, '\n');
+       if (!end)
+               end = &drc_name[nbytes];
+       *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 sprintf(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 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);
+}