rpaphp_slot.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * RPA Virtual I/O device functions
  4 * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
  5 *
  6 * All rights reserved.
  7 *
  8 * Send feedback to <lxie@us.ibm.com>
  9 *
 10 */
 11#include <linux/kernel.h>
 12#include <linux/module.h>
 13#include <linux/sysfs.h>
 14#include <linux/of.h>
 15#include <linux/pci.h>
 16#include <linux/string.h>
 17#include <linux/slab.h>
 18
 19#include <asm/rtas.h>
 20#include "rpaphp.h"
 21
 22/* free up the memory used by a slot */
 23void dealloc_slot_struct(struct slot *slot)
 24{
 25	of_node_put(slot->dn);
 26	kfree(slot->name);
 27	kfree(slot);
 28}
 29
 30struct slot *alloc_slot_struct(struct device_node *dn,
 31		int drc_index, char *drc_name, int power_domain)
 32{
 33	struct slot *slot;
 34
 35	slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
 36	if (!slot)
 37		goto error_nomem;
 38	slot->name = kstrdup(drc_name, GFP_KERNEL);
 39	if (!slot->name)
 40		goto error_slot;
 41	slot->dn = of_node_get(dn);
 42	slot->index = drc_index;
 43	slot->power_domain = power_domain;
 44	slot->hotplug_slot.ops = &rpaphp_hotplug_slot_ops;
 45
 46	return (slot);
 47
 48error_slot:
 49	kfree(slot);
 50error_nomem:
 51	return NULL;
 52}
 53
 54static int is_registered(struct slot *slot)
 55{
 56	struct slot *tmp_slot;
 57
 58	list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
 59		if (!strcmp(tmp_slot->name, slot->name))
 60			return 1;
 61	}
 62	return 0;
 63}
 64
 65int rpaphp_deregister_slot(struct slot *slot)
 66{
 67	int retval = 0;
 68	struct hotplug_slot *php_slot = &slot->hotplug_slot;
 69
 70	 dbg("%s - Entry: deregistering slot=%s\n",
 71		__func__, slot->name);
 72
 73	list_del(&slot->rpaphp_slot_list);
 74	pci_hp_deregister(php_slot);
 75	dealloc_slot_struct(slot);
 76
 77	dbg("%s - Exit: rc[%d]\n", __func__, retval);
 78	return retval;
 79}
 80EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
 81
 82int rpaphp_register_slot(struct slot *slot)
 83{
 84	struct hotplug_slot *php_slot = &slot->hotplug_slot;
 85	struct device_node *child;
 86	u32 my_index;
 87	int retval;
 88	int slotno = -1;
 89
 90	dbg("%s registering slot:path[%pOF] index[%x], name[%s] pdomain[%x] type[%d]\n",
 91		__func__, slot->dn, slot->index, slot->name,
 92		slot->power_domain, slot->type);
 93
 94	/* should not try to register the same slot twice */
 95	if (is_registered(slot)) {
 96		err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
 97		return -EAGAIN;
 98	}
 99
100	for_each_child_of_node(slot->dn, child) {
101		retval = of_property_read_u32(child, "ibm,my-drc-index", &my_index);
102		if (my_index == slot->index) {
103			slotno = PCI_SLOT(PCI_DN(child)->devfn);
104			of_node_put(child);
105			break;
106		}
107	}
108
109	retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name);
110	if (retval) {
111		err("pci_hp_register failed with error %d\n", retval);
112		return retval;
113	}
114
115	/* add slot to our internal list */
116	list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
117	info("Slot [%s] registered\n", slot->name);
118	return 0;
119}