TrustedFirmware Git Browser
Code Review Sign In
review.trustedfirmware.org / hafnium / third_party / linux.git / 3a0ad55d848b50499b68d7141d4eca997fce28ef / . / drivers / pci / hotplug / rpaphp_slot.c
blob: b916c8e4372d8a225e214f8049bf50e4b481d0a0 [file] [log] [blame]
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]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/pci.h>
15#include <linux/string.h>
16#include <linux/slab.h>
17
18#include <asm/rtas.h>
19#include "rpaphp.h"
20
21/* free up the memory used by a slot */
22void dealloc_slot_struct(struct slot *slot)
23{
24 kfree(slot->hotplug_slot->info);
25 kfree(slot->name);
26 kfree(slot->hotplug_slot);
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->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
39 if (!slot->hotplug_slot)
40 goto error_slot;
41 slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
42 GFP_KERNEL);
43 if (!slot->hotplug_slot->info)
44 goto error_hpslot;
45 slot->name = kstrdup(drc_name, GFP_KERNEL);
46 if (!slot->name)
47 goto error_info;
48 slot->dn = dn;
49 slot->index = drc_index;
50 slot->power_domain = power_domain;
51 slot->hotplug_slot->private = slot;
52 slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
53
54 return (slot);
55
56error_info:
57 kfree(slot->hotplug_slot->info);
58error_hpslot:
59 kfree(slot->hotplug_slot);
60error_slot:
61 kfree(slot);
62error_nomem:
63 return NULL;
64}
65
66static int is_registered(struct slot *slot)
67{
68 struct slot *tmp_slot;
69
70 list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
71 if (!strcmp(tmp_slot->name, slot->name))
72 return 1;
73 }
74 return 0;
75}
76
77int rpaphp_deregister_slot(struct slot *slot)
78{
79 int retval = 0;
80 struct hotplug_slot *php_slot = slot->hotplug_slot;
81
82 dbg("%s - Entry: deregistering slot=%s\n",
83 __func__, slot->name);
84
85 list_del(&slot->rpaphp_slot_list);
86 pci_hp_deregister(php_slot);
87 dealloc_slot_struct(slot);
88
89 dbg("%s - Exit: rc[%d]\n", __func__, retval);
90 return retval;
91}
92EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
93
94int rpaphp_register_slot(struct slot *slot)
95{
96 struct hotplug_slot *php_slot = slot->hotplug_slot;
97 struct device_node *child;
98 u32 my_index;
99 int retval;
100 int slotno = -1;
101
102 dbg("%s registering slot:path[%pOF] index[%x], name[%s] pdomain[%x] type[%d]\n",
103 __func__, slot->dn, slot->index, slot->name,
104 slot->power_domain, slot->type);
105
106 /* should not try to register the same slot twice */
107 if (is_registered(slot)) {
108 err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
109 return -EAGAIN;
110 }
111
112 for_each_child_of_node(slot->dn, child) {
113 retval = of_property_read_u32(child, "ibm,my-drc-index", &my_index);
114 if (my_index == slot->index) {
115 slotno = PCI_SLOT(PCI_DN(child)->devfn);
116 of_node_put(child);
117 break;
118 }
119 }
120
121 retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name);
122 if (retval) {
123 err("pci_hp_register failed with error %d\n", retval);
124 return retval;
125 }
126
127 /* add slot to our internal list */
128 list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
129 info("Slot [%s] registered\n", slot->name);
130 return 0;
131}