summaryrefslogtreecommitdiffstats
path: root/drivers/pci/hotplug/rpaphp_slot.c
blob: 9b714ea93d207036fe9b51d6f3c2bbe0233c1c25 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/*
 * RPA Virtual I/O device functions 
 * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
 *
 * All rights reserved.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <lxie@us.ibm.com>
 *
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/sysfs.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/slab.h>

#include <asm/rtas.h>
#include "rpaphp.h"

/* free up the memory used by a slot */
static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = (struct slot *) hotplug_slot->private;
	dealloc_slot_struct(slot);
}

void dealloc_slot_struct(struct slot *slot)
{
	kfree(slot->hotplug_slot->info);
	kfree(slot->hotplug_slot->name);
	kfree(slot->hotplug_slot);
	kfree(slot);
}

struct slot *alloc_slot_struct(struct device_node *dn,
                       int drc_index, char *drc_name, int power_domain)
{
	struct slot *slot;
	
	slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
	if (!slot)
		goto error_nomem;
	slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
	if (!slot->hotplug_slot)
		goto error_slot;	
	slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
					   GFP_KERNEL);
	if (!slot->hotplug_slot->info)
		goto error_hpslot;
	slot->hotplug_slot->name = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
	if (!slot->hotplug_slot->name)
		goto error_info;	
	slot->name = slot->hotplug_slot->name;
	strcpy(slot->name, drc_name);
	slot->dn = dn;
	slot->index = drc_index;
	slot->power_domain = power_domain;
	slot->hotplug_slot->private = slot;
	slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
	slot->hotplug_slot->release = &rpaphp_release_slot;
	
	return (slot);

error_info:
	kfree(slot->hotplug_slot->info);
error_hpslot:
	kfree(slot->hotplug_slot);
error_slot:
	kfree(slot);
error_nomem:
	return NULL;
}

static int is_registered(struct slot *slot)
{
	struct slot *tmp_slot;

	list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
		if (!strcmp(tmp_slot->name, slot->name))
			return 1;
	}	
	return 0;
}

int rpaphp_deregister_slot(struct slot *slot)
{
	int retval = 0;
	struct hotplug_slot *php_slot = slot->hotplug_slot;

	 dbg("%s - Entry: deregistering slot=%s\n",
		__func__, slot->name);

	list_del(&slot->rpaphp_slot_list);
	
	retval = pci_hp_deregister(php_slot);
	if (retval)
		err("Problem unregistering a slot %s\n", slot->name);

	dbg("%s - Exit: rc[%d]\n", __func__, retval);
	return retval;
}
EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);

int rpaphp_register_slot(struct slot *slot)
{
	struct hotplug_slot *php_slot = slot->hotplug_slot;
	int retval;
	int slotno;

	dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n", 
		__func__, slot->dn->full_name, slot->index, slot->name,
		slot->power_domain, slot->type);

	/* should not try to register the same slot twice */
	if (is_registered(slot)) {
		err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
		return -EAGAIN;
	}	

	if (slot->dn->child)
		slotno = PCI_SLOT(PCI_DN(slot->dn->child)->devfn);
	else
		slotno = -1;
	retval = pci_hp_register(php_slot, slot->bus, slotno);
	if (retval) {
		err("pci_hp_register failed with error %d\n", retval);
		return retval;
	}

	/* add slot to our internal list */
	list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
	info("Slot [%s] registered\n", slot->name);
	return 0;

sysfs_fail:
	pci_hp_deregister(php_slot);
	return retval;
}

OpenPOWER on IntegriCloud