3 * IBM ASM Service Processor Device Driver
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.
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.
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.
19 * Copyright (C) IBM Corporation, 2004
21 * Author: Max Asböck <amax@us.ibm.com>
28 static void exec_next_command(struct service_processor *sp);
29 static void free_command(struct kobject *kobj);
31 static struct kobj_type ibmasm_cmd_kobj_type = {
32 .release = free_command,
35 static atomic_t command_count = ATOMIC_INIT(0);
37 struct command *ibmasm_new_command(struct service_processor *sp, size_t buffer_size)
41 if (buffer_size > IBMASM_CMD_MAX_BUFFER_SIZE)
44 cmd = kzalloc(sizeof(struct command), GFP_KERNEL);
49 cmd->buffer = kzalloc(buffer_size, GFP_KERNEL);
50 if (cmd->buffer == NULL) {
54 cmd->buffer_size = buffer_size;
56 kobject_init(&cmd->kobj);
57 cmd->kobj.ktype = &ibmasm_cmd_kobj_type;
58 cmd->lock = &sp->lock;
60 cmd->status = IBMASM_CMD_PENDING;
61 init_waitqueue_head(&cmd->wait);
62 INIT_LIST_HEAD(&cmd->queue_node);
64 atomic_inc(&command_count);
65 dbg("command count: %d\n", atomic_read(&command_count));
70 static void free_command(struct kobject *kobj)
72 struct command *cmd = to_command(kobj);
74 list_del(&cmd->queue_node);
75 atomic_dec(&command_count);
76 dbg("command count: %d\n", atomic_read(&command_count));
81 static void enqueue_command(struct service_processor *sp, struct command *cmd)
83 list_add_tail(&cmd->queue_node, &sp->command_queue);
86 static struct command *dequeue_command(struct service_processor *sp)
89 struct list_head *next;
91 if (list_empty(&sp->command_queue))
94 next = sp->command_queue.next;
96 cmd = list_entry(next, struct command, queue_node);
101 static inline void do_exec_command(struct service_processor *sp)
105 dbg("%s:%d at %s\n", __FUNCTION__, __LINE__, get_timestamp(tsbuf));
107 if (ibmasm_send_i2o_message(sp)) {
108 sp->current_command->status = IBMASM_CMD_FAILED;
109 wake_up(&sp->current_command->wait);
110 command_put(sp->current_command);
111 exec_next_command(sp);
117 * send a command to a service processor
118 * Commands are executed sequentially. One command (sp->current_command)
119 * is sent to the service processor. Once the interrupt handler gets a
120 * message of type command_response, the message is copied into
121 * the current commands buffer,
123 void ibmasm_exec_command(struct service_processor *sp, struct command *cmd)
128 dbg("%s:%d at %s\n", __FUNCTION__, __LINE__, get_timestamp(tsbuf));
130 spin_lock_irqsave(&sp->lock, flags);
132 if (!sp->current_command) {
133 sp->current_command = cmd;
134 command_get(sp->current_command);
135 spin_unlock_irqrestore(&sp->lock, flags);
138 enqueue_command(sp, cmd);
139 spin_unlock_irqrestore(&sp->lock, flags);
143 static void exec_next_command(struct service_processor *sp)
148 dbg("%s:%d at %s\n", __FUNCTION__, __LINE__, get_timestamp(tsbuf));
150 spin_lock_irqsave(&sp->lock, flags);
151 sp->current_command = dequeue_command(sp);
152 if (sp->current_command) {
153 command_get(sp->current_command);
154 spin_unlock_irqrestore(&sp->lock, flags);
157 spin_unlock_irqrestore(&sp->lock, flags);
162 * Sleep until a command has failed or a response has been received
163 * and the command status been updated by the interrupt handler.
164 * (see receive_response).
166 void ibmasm_wait_for_response(struct command *cmd, int timeout)
168 wait_event_interruptible_timeout(cmd->wait,
169 cmd->status == IBMASM_CMD_COMPLETE ||
170 cmd->status == IBMASM_CMD_FAILED,
175 * receive_command_response
176 * called by the interrupt handler when a dot command of type command_response
179 void ibmasm_receive_command_response(struct service_processor *sp, void *response, size_t size)
181 struct command *cmd = sp->current_command;
183 if (!sp->current_command)
186 memcpy_fromio(cmd->buffer, response, min(size, cmd->buffer_size));
187 cmd->status = IBMASM_CMD_COMPLETE;
188 wake_up(&sp->current_command->wait);
189 command_put(sp->current_command);
190 exec_next_command(sp);