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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* IBM ASM Service Processor Device Driver
*
* Copyright (C) IBM Corporation, 2004
*
* Author: Max Asböck <amax@us.ibm.com>
*
* This driver is based on code originally written by Pete Reynolds
* and others.
*/
/*
* The ASM device driver does the following things:
*
* 1) When loaded it sends a message to the service processor,
* indicating that an OS is * running. This causes the service processor
* to send periodic heartbeats to the OS.
*
* 2) Answers the periodic heartbeats sent by the service processor.
* Failure to do so would result in system reboot.
*
* 3) Acts as a pass through for dot commands sent from user applications.
* The interface for this is the ibmasmfs file system.
*
* 4) Allows user applications to register for event notification. Events
* are sent to the driver through interrupts. They can be read from user
* space through the ibmasmfs file system.
*
* 5) Allows user space applications to send heartbeats to the service
* processor (aka reverse heartbeats). Again this happens through ibmasmfs.
*
* 6) Handles remote mouse and keyboard event interrupts and makes them
* available to user applications through ibmasmfs.
*
*/
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/slab.h>
#include "ibmasm.h"
#include "lowlevel.h"
#include "remote.h"
int ibmasm_debug = 0;
module_param(ibmasm_debug, int , S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(ibmasm_debug, " Set debug mode on or off");
static int ibmasm_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
int result;
struct service_processor *sp;
if ((result = pci_enable_device(pdev))) {
dev_err(&pdev->dev, "Failed to enable PCI device\n");
return result;
}
if ((result = pci_request_regions(pdev, DRIVER_NAME))) {
dev_err(&pdev->dev, "Failed to allocate PCI resources\n");
goto error_resources;
}
/* vnc client won't work without bus-mastering */
pci_set_master(pdev);
sp = kzalloc(sizeof(struct service_processor), GFP_KERNEL);
if (sp == NULL) {
dev_err(&pdev->dev, "Failed to allocate memory\n");
result = -ENOMEM;
goto error_kmalloc;
}
spin_lock_init(&sp->lock);
INIT_LIST_HEAD(&sp->command_queue);
pci_set_drvdata(pdev, (void *)sp);
sp->dev = &pdev->dev;
sp->number = pdev->bus->number;
snprintf(sp->dirname, IBMASM_NAME_SIZE, "%d", sp->number);
snprintf(sp->devname, IBMASM_NAME_SIZE, "%s%d", DRIVER_NAME, sp->number);
result = ibmasm_event_buffer_init(sp);
if (result) {
dev_err(sp->dev, "Failed to allocate event buffer\n");
goto error_eventbuffer;
}
result = ibmasm_heartbeat_init(sp);
if (result) {
dev_err(sp->dev, "Failed to allocate heartbeat command\n");
goto error_heartbeat;
}
sp->irq = pdev->irq;
sp->base_address = pci_ioremap_bar(pdev, 0);
if (!sp->base_address) {
dev_err(sp->dev, "Failed to ioremap pci memory\n");
result = -ENODEV;
goto error_ioremap;
}
result = request_irq(sp->irq, ibmasm_interrupt_handler, IRQF_SHARED, sp->devname, (void*)sp);
if (result) {
dev_err(sp->dev, "Failed to register interrupt handler\n");
goto error_request_irq;
}
enable_sp_interrupts(sp->base_address);
result = ibmasm_init_remote_input_dev(sp);
if (result) {
dev_err(sp->dev, "Failed to initialize remote queue\n");
goto error_init_remote;
}
result = ibmasm_send_driver_vpd(sp);
if (result) {
dev_err(sp->dev, "Failed to send driver VPD to service processor\n");
goto error_send_message;
}
result = ibmasm_send_os_state(sp, SYSTEM_STATE_OS_UP);
if (result) {
dev_err(sp->dev, "Failed to send OS state to service processor\n");
goto error_send_message;
}
ibmasmfs_add_sp(sp);
ibmasm_register_uart(sp);
return 0;
error_send_message:
ibmasm_free_remote_input_dev(sp);
error_init_remote:
disable_sp_interrupts(sp->base_address);
free_irq(sp->irq, (void *)sp);
error_request_irq:
iounmap(sp->base_address);
error_ioremap:
ibmasm_heartbeat_exit(sp);
error_heartbeat:
ibmasm_event_buffer_exit(sp);
error_eventbuffer:
kfree(sp);
error_kmalloc:
pci_release_regions(pdev);
error_resources:
pci_disable_device(pdev);
return result;
}
static void ibmasm_remove_one(struct pci_dev *pdev)
{
struct service_processor *sp = pci_get_drvdata(pdev);
dbg("Unregistering UART\n");
ibmasm_unregister_uart(sp);
dbg("Sending OS down message\n");
if (ibmasm_send_os_state(sp, SYSTEM_STATE_OS_DOWN))
err("failed to get response to 'Send OS State' command\n");
dbg("Disabling heartbeats\n");
ibmasm_heartbeat_exit(sp);
dbg("Disabling interrupts\n");
disable_sp_interrupts(sp->base_address);
dbg("Freeing SP irq\n");
free_irq(sp->irq, (void *)sp);
dbg("Cleaning up\n");
ibmasm_free_remote_input_dev(sp);
iounmap(sp->base_address);
ibmasm_event_buffer_exit(sp);
kfree(sp);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
static struct pci_device_id ibmasm_pci_table[] =
{
{ PCI_DEVICE(VENDORID_IBM, DEVICEID_RSA) },
{},
};
static struct pci_driver ibmasm_driver = {
.name = DRIVER_NAME,
.id_table = ibmasm_pci_table,
.probe = ibmasm_init_one,
.remove = ibmasm_remove_one,
};
static void __exit ibmasm_exit (void)
{
ibmasm_unregister_panic_notifier();
ibmasmfs_unregister();
pci_unregister_driver(&ibmasm_driver);
info(DRIVER_DESC " version " DRIVER_VERSION " unloaded");
}
static int __init ibmasm_init(void)
{
int result = pci_register_driver(&ibmasm_driver);
if (result)
return result;
result = ibmasmfs_register();
if (result) {
pci_unregister_driver(&ibmasm_driver);
err("Failed to register ibmasmfs file system");
return result;
}
ibmasm_register_panic_notifier();
info(DRIVER_DESC " version " DRIVER_VERSION " loaded");
return 0;
}
module_init(ibmasm_init);
module_exit(ibmasm_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, ibmasm_pci_table);
|
