tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1
2/*
3 * IBM ASM Service Processor Device Driver
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 *
19 * Copyright (C) IBM Corporation, 2004
20 *
21 * Author: Max Asböck <amax@us.ibm.com>
22 *
23 */
24
25#include <linux/kernel.h>
26#include <linux/types.h>
27#include <linux/errno.h>
28#include <linux/list.h>
29#include <linux/wait.h>
30#include <linux/spinlock.h>
31#include <linux/slab.h>
32#include <linux/module.h>
33#include <linux/interrupt.h>
34#include <linux/kref.h>
35#include <linux/device.h>
36#include <linux/input.h>
37#include <linux/time64.h>
38
39/* Driver identification */
40#define DRIVER_NAME "ibmasm"
41#define DRIVER_VERSION "1.0"
42#define DRIVER_AUTHOR "Max Asbock <masbock@us.ibm.com>, Vernon Mauery <vernux@us.ibm.com>"
43#define DRIVER_DESC "IBM ASM Service Processor Driver"
44
45#define err(msg) printk(KERN_ERR "%s: " msg "\n", DRIVER_NAME)
46#define info(msg) printk(KERN_INFO "%s: " msg "\n", DRIVER_NAME)
47
48extern int ibmasm_debug;
49#define dbg(STR, ARGS...) \
50 do { \
51 if (ibmasm_debug) \
52 printk(KERN_DEBUG STR , ##ARGS); \
53 } while (0)
54
55static inline char *get_timestamp(char *buf)
56{
57 struct timespec64 now;
58
59 ktime_get_real_ts64(&now);
60 sprintf(buf, "%llu.%.08lu", (long long)now.tv_sec,
61 now.tv_nsec / NSEC_PER_USEC);
62 return buf;
63}
64
65#define IBMASM_CMD_PENDING 0
66#define IBMASM_CMD_COMPLETE 1
67#define IBMASM_CMD_FAILED 2
68
69#define IBMASM_CMD_TIMEOUT_NORMAL 45
70#define IBMASM_CMD_TIMEOUT_EXTRA 240
71
72#define IBMASM_CMD_MAX_BUFFER_SIZE 0x8000
73
74#define REVERSE_HEARTBEAT_TIMEOUT 120
75
76#define HEARTBEAT_BUFFER_SIZE 0x400
77
78#ifdef IA64
79#define IBMASM_DRIVER_VPD "Lin64 6.08 "
80#else
81#define IBMASM_DRIVER_VPD "Lin32 6.08 "
82#endif
83
84#define SYSTEM_STATE_OS_UP 5
85#define SYSTEM_STATE_OS_DOWN 4
86
87#define IBMASM_NAME_SIZE 16
88
89#define IBMASM_NUM_EVENTS 10
90#define IBMASM_EVENT_MAX_SIZE 2048u
91
92
93struct command {
94 struct list_head queue_node;
95 wait_queue_head_t wait;
96 unsigned char *buffer;
97 size_t buffer_size;
98 int status;
99 struct kref kref;
100 spinlock_t *lock;
101};
102#define to_command(c) container_of(c, struct command, kref)
103
104void ibmasm_free_command(struct kref *kref);
105static inline void command_put(struct command *cmd)
106{
107 unsigned long flags;
108 spinlock_t *lock = cmd->lock;
109
110 spin_lock_irqsave(lock, flags);
111 kref_put(&cmd->kref, ibmasm_free_command);
112 spin_unlock_irqrestore(lock, flags);
113}
114
115static inline void command_get(struct command *cmd)
116{
117 kref_get(&cmd->kref);
118}
119
120
121struct ibmasm_event {
122 unsigned int serial_number;
123 unsigned int data_size;
124 unsigned char data[IBMASM_EVENT_MAX_SIZE];
125};
126
127struct event_buffer {
128 struct ibmasm_event events[IBMASM_NUM_EVENTS];
129 unsigned int next_serial_number;
130 unsigned int next_index;
131 struct list_head readers;
132};
133
134struct event_reader {
135 int cancelled;
136 unsigned int next_serial_number;
137 wait_queue_head_t wait;
138 struct list_head node;
139 unsigned int data_size;
140 unsigned char data[IBMASM_EVENT_MAX_SIZE];
141};
142
143struct reverse_heartbeat {
144 wait_queue_head_t wait;
145 unsigned int stopped;
146};
147
148struct ibmasm_remote {
149 struct input_dev *keybd_dev;
150 struct input_dev *mouse_dev;
151};
152
153struct service_processor {
154 struct list_head node;
155 spinlock_t lock;
156 void __iomem *base_address;
157 unsigned int irq;
158 struct command *current_command;
159 struct command *heartbeat;
160 struct list_head command_queue;
161 struct event_buffer *event_buffer;
162 char dirname[IBMASM_NAME_SIZE];
163 char devname[IBMASM_NAME_SIZE];
164 unsigned int number;
165 struct ibmasm_remote remote;
166 int serial_line;
167 struct device *dev;
168};
169
170/* command processing */
171struct command *ibmasm_new_command(struct service_processor *sp, size_t buffer_size);
172void ibmasm_exec_command(struct service_processor *sp, struct command *cmd);
173void ibmasm_wait_for_response(struct command *cmd, int timeout);
174void ibmasm_receive_command_response(struct service_processor *sp, void *response, size_t size);
175
176/* event processing */
177int ibmasm_event_buffer_init(struct service_processor *sp);
178void ibmasm_event_buffer_exit(struct service_processor *sp);
179void ibmasm_receive_event(struct service_processor *sp, void *data, unsigned int data_size);
180void ibmasm_event_reader_register(struct service_processor *sp, struct event_reader *reader);
181void ibmasm_event_reader_unregister(struct service_processor *sp, struct event_reader *reader);
182int ibmasm_get_next_event(struct service_processor *sp, struct event_reader *reader);
183void ibmasm_cancel_next_event(struct event_reader *reader);
184
185/* heartbeat - from SP to OS */
186void ibmasm_register_panic_notifier(void);
187void ibmasm_unregister_panic_notifier(void);
188int ibmasm_heartbeat_init(struct service_processor *sp);
189void ibmasm_heartbeat_exit(struct service_processor *sp);
190void ibmasm_receive_heartbeat(struct service_processor *sp, void *message, size_t size);
191
192/* reverse heartbeat - from OS to SP */
193void ibmasm_init_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
194int ibmasm_start_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
195void ibmasm_stop_reverse_heartbeat(struct reverse_heartbeat *rhb);
196
197/* dot commands */
198void ibmasm_receive_message(struct service_processor *sp, void *data, int data_size);
199int ibmasm_send_driver_vpd(struct service_processor *sp);
200int ibmasm_send_os_state(struct service_processor *sp, int os_state);
201
202/* low level message processing */
203int ibmasm_send_i2o_message(struct service_processor *sp);
204irqreturn_t ibmasm_interrupt_handler(int irq, void * dev_id);
205
206/* remote console */
207void ibmasm_handle_mouse_interrupt(struct service_processor *sp);
208int ibmasm_init_remote_input_dev(struct service_processor *sp);
209void ibmasm_free_remote_input_dev(struct service_processor *sp);
210
211/* file system */
212int ibmasmfs_register(void);
213void ibmasmfs_unregister(void);
214void ibmasmfs_add_sp(struct service_processor *sp);
215
216/* uart */
217#if IS_ENABLED(CONFIG_SERIAL_8250)
218void ibmasm_register_uart(struct service_processor *sp);
219void ibmasm_unregister_uart(struct service_processor *sp);
220#else
221#define ibmasm_register_uart(sp) do { } while(0)
222#define ibmasm_unregister_uart(sp) do { } while(0)
223#endif