Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

drivers/misc/ibmasm/command.c

@@ -0,0 +1,175 @@
+
+/*
+ * IBM ASM Service Processor Device Driver
+ *
+ * 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.  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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) IBM Corporation, 2004
+ *
+ * Author: Max Asb<73>ck <amax@us.ibm.com> 
+ *
+ */
+
+#include "ibmasm.h"
+
+static void exec_next_command(struct service_processor *sp);
+static void free_command(struct kobject *kobj);
+
+static struct kobj_type ibmasm_cmd_kobj_type = {
+	.release = free_command,
+};
+
+
+struct command *ibmasm_new_command(size_t buffer_size)
+{
+	struct command *cmd;
+
+	if (buffer_size > IBMASM_CMD_MAX_BUFFER_SIZE)
+		return NULL;
+
+	cmd = kmalloc(sizeof(struct command), GFP_KERNEL);
+	if (cmd == NULL)
+		return NULL;
+
+	memset(cmd, 0, sizeof(*cmd));
+
+	cmd->buffer = kmalloc(buffer_size, GFP_KERNEL);
+	if (cmd->buffer == NULL) {
+		kfree(cmd);
+		return NULL;
+	}
+	memset(cmd->buffer, 0, buffer_size);
+	cmd->buffer_size = buffer_size;
+
+	kobject_init(&cmd->kobj);
+	cmd->kobj.ktype = &ibmasm_cmd_kobj_type;
+
+	cmd->status = IBMASM_CMD_PENDING;
+	init_waitqueue_head(&cmd->wait);
+	INIT_LIST_HEAD(&cmd->queue_node);
+
+	return cmd;
+}
+
+static void free_command(struct kobject *kobj)
+{
+	struct command *cmd = to_command(kobj);
+ 
+	list_del(&cmd->queue_node);
+	kfree(cmd->buffer);
+	kfree(cmd);
+}
+
+static void enqueue_command(struct service_processor *sp, struct command *cmd)
+{
+	list_add_tail(&cmd->queue_node, &sp->command_queue);
+}
+
+static struct command *dequeue_command(struct service_processor *sp)
+{
+	struct command *cmd;
+	struct list_head *next;
+
+	if (list_empty(&sp->command_queue))
+		return NULL;
+
+	next = sp->command_queue.next;
+	list_del_init(next);
+	cmd = list_entry(next, struct command, queue_node);
+
+	return cmd;
+}
+
+static inline void do_exec_command(struct service_processor *sp)
+{
+	if (ibmasm_send_i2o_message(sp)) {
+		sp->current_command->status = IBMASM_CMD_FAILED;
+		exec_next_command(sp);
+	}
+}
+	
+/**
+ * exec_command
+ * send a command to a service processor
+ * Commands are executed sequentially. One command (sp->current_command)
+ * is sent to the service processor. Once the interrupt handler gets a
+ * message of type command_response, the message is copied into
+ * the current commands buffer, 
+ */
+void ibmasm_exec_command(struct service_processor *sp, struct command *cmd)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&sp->lock, flags);
+
+	if (!sp->current_command) {
+		command_get(cmd);
+		sp->current_command = cmd;
+		spin_unlock_irqrestore(&sp->lock, flags);
+
+		do_exec_command(sp);
+	} else {
+		enqueue_command(sp, cmd);
+		spin_unlock_irqrestore(&sp->lock, flags);
+	}
+}
+
+static void exec_next_command(struct service_processor *sp)
+{
+	unsigned long flags;
+
+	wake_up(&sp->current_command->wait);
+	command_put(sp->current_command);
+
+	spin_lock_irqsave(&sp->lock, flags);
+	sp->current_command = dequeue_command(sp);
+	if (sp->current_command) {
+		command_get(sp->current_command);
+		spin_unlock_irqrestore(&sp->lock, flags);
+		do_exec_command(sp);
+	} else {
+		spin_unlock_irqrestore(&sp->lock, flags);
+	}
+}
+
+/** 
+ * Sleep until a command has failed or a response has been received
+ * and the command status been updated by the interrupt handler.
+ * (see receive_response).
+ */
+void ibmasm_wait_for_response(struct command *cmd, int timeout)
+{
+	wait_event_interruptible_timeout(cmd->wait,
+				cmd->status == IBMASM_CMD_COMPLETE ||
+				cmd->status == IBMASM_CMD_FAILED,
+				timeout * HZ);
+}
+
+/**
+ * receive_command_response
+ * called by the interrupt handler when a dot command of type command_response
+ * was received.
+ */
+void ibmasm_receive_command_response(struct service_processor *sp, void *response, size_t size)
+{
+	struct command *cmd = sp->current_command;
+
+	if (!sp->current_command) 
+		return; 
+
+	memcpy(cmd->buffer, response, min(size, cmd->buffer_size));
+	cmd->status = IBMASM_CMD_COMPLETE;
+	exec_next_command(sp);
+}