141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* RPA Virtual I/O device functions
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* Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
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*
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* All rights reserved.
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*
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* Send feedback to <lxie@us.ibm.com>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sysfs.h>
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#include <linux/pci.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <asm/rtas.h>
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#include "rpaphp.h"
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/* free up the memory used by a slot */
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static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = (struct slot *) hotplug_slot->private;
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dealloc_slot_struct(slot);
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}
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void dealloc_slot_struct(struct slot *slot)
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{
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kfree(slot->hotplug_slot->info);
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kfree(slot->name);
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kfree(slot->hotplug_slot);
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kfree(slot);
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}
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struct slot *alloc_slot_struct(struct device_node *dn,
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int drc_index, char *drc_name, int power_domain)
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{
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struct slot *slot;
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slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
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if (!slot)
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goto error_nomem;
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slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
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if (!slot->hotplug_slot)
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goto error_slot;
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slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
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GFP_KERNEL);
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if (!slot->hotplug_slot->info)
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goto error_hpslot;
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slot->name = kstrdup(drc_name, GFP_KERNEL);
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if (!slot->name)
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goto error_info;
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slot->dn = dn;
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slot->index = drc_index;
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slot->power_domain = power_domain;
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slot->hotplug_slot->private = slot;
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slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
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slot->hotplug_slot->release = &rpaphp_release_slot;
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return (slot);
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error_info:
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kfree(slot->hotplug_slot->info);
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error_hpslot:
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kfree(slot->hotplug_slot);
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error_slot:
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kfree(slot);
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error_nomem:
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return NULL;
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}
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static int is_registered(struct slot *slot)
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{
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struct slot *tmp_slot;
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list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
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if (!strcmp(tmp_slot->name, slot->name))
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return 1;
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}
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return 0;
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}
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int rpaphp_deregister_slot(struct slot *slot)
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{
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int retval = 0;
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struct hotplug_slot *php_slot = slot->hotplug_slot;
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dbg("%s - Entry: deregistering slot=%s\n",
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__func__, slot->name);
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list_del(&slot->rpaphp_slot_list);
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retval = pci_hp_deregister(php_slot);
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if (retval)
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err("Problem unregistering a slot %s\n", slot->name);
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dbg("%s - Exit: rc[%d]\n", __func__, retval);
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return retval;
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}
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EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
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int rpaphp_register_slot(struct slot *slot)
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{
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struct hotplug_slot *php_slot = slot->hotplug_slot;
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struct device_node *child;
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u32 my_index;
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int retval;
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int slotno = -1;
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dbg("%s registering slot:path[%pOF] index[%x], name[%s] pdomain[%x] type[%d]\n",
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__func__, slot->dn, slot->index, slot->name,
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slot->power_domain, slot->type);
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/* should not try to register the same slot twice */
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if (is_registered(slot)) {
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err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
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return -EAGAIN;
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}
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for_each_child_of_node(slot->dn, child) {
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retval = of_property_read_u32(child, "ibm,my-drc-index", &my_index);
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if (my_index == slot->index) {
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slotno = PCI_SLOT(PCI_DN(child)->devfn);
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of_node_put(child);
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break;
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}
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}
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retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name);
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if (retval) {
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err("pci_hp_register failed with error %d\n", retval);
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return retval;
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}
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/* add slot to our internal list */
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list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
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info("Slot [%s] registered\n", slot->name);
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return 0;
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}
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