i20 rewrite

From: Markus Lidel <Markus.Lidel@shadowconnect.com>

generic:
- split i2o_core into several files, grouped by same function
- I2O devices are now registered as devices and show up in sysfs
- the various I2O OSM's (e.g. i2o_scsi) now register in the I2O core
   and also use the 2.6 driver mechanism.
- I2O messages will be created in the message frame instead of creating
   it in local memory and copying it over later on.
- context list for 64 pointer to 32 context conversion now uses a
   double linked list

PCI:
- driver now registers as a PCI device driver and uses probe function to
   get the possible controllers. (needed for hotplugging)
- converted DMA handling from pci_* to generic dma_* functions

Block OSM:
- use one request queue per I2O block device instead of one per
   controller
- I2O block devices and queues are allocated dynamically and therefore
   no more limit of block devices

SCSI OSM:
- corrected bug in SCSI reply function which caused the memory to be
   freed before the done function was called.
- one I2O controller registers as one scsi host instead of one scsi host
   per channel
- no more ch,id,lun => tid mapping table

Config OSM:
- added ioctl32 for passthru and getiops.
- removed ioctl_html

Documentation:
- removed TODO entries from README
- moved docs under Documentation/i2o
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

Documentation/i2o/README

+
+	Linux I2O Support	(c) Copyright 1999 Red Hat Software
+					and others.
+
+	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.
+
+AUTHORS (so far)
+
+Alan Cox, Building Number Three Ltd.
+	Core code, SCSI and Block OSMs
+
+Steve Ralston, LSI Logic Corp.
+	Debugging SCSI and Block OSM
+
+Deepak Saxena, Intel Corp.
+	Various core/block extensions
+	/proc interface, bug fixes
+	Ioctl interfaces for control
+	Debugging LAN OSM
+
+Philip Rumpf
+	Fixed assorted dumb SMP locking bugs
+
+Juha Sievanen, University of Helsinki Finland
+	LAN OSM code
+	/proc interface to LAN class
+	Bug fixes
+	Core code extensions
+
+Auvo Häkkinen, University of Helsinki Finland
+	LAN OSM code
+	/Proc interface to LAN class
+	Bug fixes
+	Core code extensions
+
+Taneli Vähäkangas, University of Helsinki Finland
+	Fixes to i2o_config
+
+CREDITS
+
+	This work was made possible by
+
+Red Hat Software
+	Funding for the Building #3 part of the project
+
+Symbios Logic (Now LSI)
+	Host adapters, hints, known to work platforms when I hit
+	compatibility problems
+
+BoxHill Corporation
+	Loan of initial FibreChannel disk array used for development work.
+
+European Comission
+	Funding the work done by the University of Helsinki
+
+SysKonnect
+        Loan of FDDI and Gigabit Ethernet cards
+
+ASUSTeK
+        Loan of I2O motherboard

drivers/message/i2o/Makefile

@@ -5,6 +5,7 @@
 # In the future, some of these should be built conditionally.
 #
 
+i2o_core-y		+= iop.o driver.o device.o debug.o pci.o exec-osm.o
 obj-$(CONFIG_I2O)	+= i2o_core.o
 obj-$(CONFIG_I2O_CONFIG)+= i2o_config.o
 obj-$(CONFIG_I2O_BLOCK)	+= i2o_block.o

drivers/message/i2o/driver.c

+/*
+ *	Functions to handle I2O drivers (OSMs) and I2O bus type for sysfs
+ *
+ *	Copyright (C) 2004	Markus Lidel <Markus.Lidel@shadowconnect.com>
+ *
+ *	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.
+ *
+ *	Fixes/additions:
+ *		Markus Lidel <Markus.Lidel@shadowconnect.com>
+ *			initial version.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/rwsem.h>
+#include <linux/i2o.h>
+
+
+/* max_drivers - Maximum I2O drivers (OSMs) which could be registered */
+unsigned int i2o_max_drivers = I2O_MAX_DRIVERS;
+module_param_named(max_drivers, i2o_max_drivers, uint, 0);
+MODULE_PARM_DESC(max_drivers, "maximum number of OSM's to support");
+
+/* I2O drivers lock and array */
+static spinlock_t i2o_drivers_lock = SPIN_LOCK_UNLOCKED;
+static struct i2o_driver **i2o_drivers;
+
+/**
+ *	i2o_bus_match - Tell if a I2O device class id match the class ids of
+ *			the I2O driver (OSM)
+ *
+ *	@dev: device which should be verified
+ *	@drv: the driver to match against
+ *
+ *	Used by the bus to check if the driver wants to handle the device.
+ *
+ *	Returns 1 if the class ids of the driver match the class id of the
+ *	device, otherwise 0.
+ */
+static int i2o_bus_match(struct device *dev, struct device_driver *drv)
+{
+	struct i2o_device *i2o_dev = to_i2o_device(dev);
+	struct i2o_driver *i2o_drv = to_i2o_driver(drv);
+	struct i2o_class_id *ids = i2o_drv->classes;
+
+	if (ids)
+		while (ids->class_id != I2O_CLASS_END) {
+			if (ids->class_id == i2o_dev->lct_data.class_id)
+				return 1;
+			ids++;
+		}
+	return 0;
+};
+
+/* I2O bus type */
+struct bus_type i2o_bus_type = {
+	.name = "i2o",
+	.match = i2o_bus_match,
+};
+
+/**
+ *	i2o_driver_register - Register a I2O driver (OSM) in the I2O core
+ *	@drv: I2O driver which should be registered
+ *
+ *	Registers the OSM drv in the I2O core and creates an event queues if
+ *	necessary.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+int i2o_driver_register(struct i2o_driver *drv)
+{
+	int i;
+	int rc = 0;
+	unsigned long flags;
+
+	pr_debug("Register driver %s\n", drv->name);
+
+	if (drv->event) {
+		drv->event_queue = create_workqueue(drv->name);
+		if (!drv->event_queue) {
+			printk(KERN_ERR "i2o: Could not initialize event queue "
+			       "for driver %s\n", drv->name);
+			return -EFAULT;
+		}
+		pr_debug("Event queue initialized for driver %s\n", drv->name);
+	} else
+		drv->event_queue = NULL;
+
+	drv->driver.name = drv->name;
+	drv->driver.bus = &i2o_bus_type;
+
+	spin_lock_irqsave(&i2o_drivers_lock, flags);
+
+	for (i = 0; i2o_drivers[i]; i++)
+		if (i >= i2o_max_drivers) {
+			printk(KERN_ERR "i2o: too many drivers registered, "
+			       "increase max_drivers\n");
+			spin_unlock_irqrestore(&i2o_drivers_lock, flags);
+			return -EFAULT;
+		}
+
+	drv->context = i;
+	i2o_drivers[i] = drv;
+
+	spin_unlock_irqrestore(&i2o_drivers_lock, flags);
+
+	pr_debug("driver %s gets context id %d\n", drv->name, drv->context);
+
+	rc = driver_register(&drv->driver);
+	if (rc)
+		destroy_workqueue(drv->event_queue);
+
+	return rc;
+};
+
+/**
+ *	i2o_driver_unregister - Unregister a I2O driver (OSM) from the I2O core
+ *	@drv: I2O driver which should be unregistered
+ *
+ *	Unregisters the OSM drv from the I2O core and cleanup event queues if
+ *	necessary.
+ */
+void i2o_driver_unregister(struct i2o_driver *drv)
+{
+	unsigned long flags;
+
+	pr_debug("unregister driver %s\n", drv->name);
+
+	driver_unregister(&drv->driver);
+
+	spin_lock_irqsave(&i2o_drivers_lock, flags);
+	i2o_drivers[drv->context] = NULL;
+	spin_unlock_irqrestore(&i2o_drivers_lock, flags);
+
+	if (drv->event_queue) {
+		destroy_workqueue(drv->event_queue);
+		drv->event_queue = NULL;
+		pr_debug("event queue removed for %s\n", drv->name);
+	}
+};
+
+/**
+ *	i2o_driver_dispatch - dispatch an I2O reply message
+ *	@c: I2O controller of the message
+ *	@m: I2O message number
+ *	@msg: I2O message to be delivered
+ *
+ *	The reply is delivered to the driver from which the original message
+ *	was. This function is only called from interrupt context.
+ *
+ *	Returns 0 on success and the message should not be flushed. Returns > 0
+ *	on success and if the message should be flushed afterwords. Returns
+ *	negative error code on failure (the message will be flushed too).
+ */
+int i2o_driver_dispatch(struct i2o_controller *c, u32 m,
+			struct i2o_message *msg)
+{
+	struct i2o_driver *drv;
+	u32 context = readl(&msg->u.s.icntxt);
+
+	if (likely(context < i2o_max_drivers)) {
+		spin_lock(&i2o_drivers_lock);
+		drv = i2o_drivers[context];
+		spin_unlock(&i2o_drivers_lock);
+
+		if (unlikely(!drv)) {
+			printk(KERN_WARNING "i2o: Spurious reply to unknown "
+			       "driver %d\n", context);
+			return -EIO;
+		}
+
+		if ((readl(&msg->u.head[1]) >> 24) == I2O_CMD_UTIL_EVT_REGISTER) {
+			struct i2o_device *dev, *tmp;
+			struct i2o_event *evt;
+			u16 size;
+			u16 tid;
+
+			tid = readl(&msg->u.head[1]) & 0x1fff;
+
+			pr_debug("%s: event received from device %d\n", c->name,
+				 tid);
+
+			/* cut of header from message size (in 32-bit words) */
+			size = (readl(&msg->u.head[0]) >> 16) - 5;
+
+			evt = kmalloc(size * 4 + sizeof(*evt), GFP_ATOMIC);
+			if (!evt)
+				return -ENOMEM;
+			memset(evt, 0, size * 4 + sizeof(*evt));
+
+			evt->size = size;
+			memcpy_fromio(&evt->tcntxt, &msg->u.s.tcntxt,
+				      (size + 2) * 4);
+
+			list_for_each_entry_safe(dev, tmp, &c->devices, list)
+			    if (dev->lct_data.tid == tid) {
+				evt->i2o_dev = dev;
+				break;
+			}
+
+			INIT_WORK(&evt->work, (void (*)(void *))drv->event,
+				  evt);
+			queue_work(drv->event_queue, &evt->work);
+			return 1;
+		}
+
+		if (likely(drv->reply))
+			return drv->reply(c, m, msg);
+		else
+			pr_debug("%s: Reply to driver %s, but no reply function"
+				 " defined!\n", c->name, drv->name);
+		return -EIO;
+	} else
+		printk(KERN_WARNING "i2o: Spurious reply to unknown driver "
+		       "%d\n", readl(&msg->u.s.icntxt));
+	return -EIO;
+}
+
+/**
+ *	i2o_driver_init - initialize I2O drivers (OSMs)
+ *
+ *	Registers the I2O bus and allocate memory for the array of OSMs.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+int __init i2o_driver_init(void)
+{
+	int rc = 0;
+
+	if ((i2o_max_drivers < 2) || (i2o_max_drivers > 64) ||
+	    ((i2o_max_drivers ^ (i2o_max_drivers - 1)) !=
+	     (2 * i2o_max_drivers - 1))) {
+		printk(KERN_WARNING "i2o: max_drivers set to %d, but must be "
+		       ">=2 and <= 64 and a power of 2\n", i2o_max_drivers);
+		i2o_max_drivers = I2O_MAX_DRIVERS;
+	}
+	printk(KERN_INFO "i2o: max_drivers=%d\n", i2o_max_drivers);
+
+	i2o_drivers =
+	    kmalloc(i2o_max_drivers * sizeof(*i2o_drivers), GFP_KERNEL);
+	if (!i2o_drivers)
+		return -ENOMEM;
+
+	memset(i2o_drivers, 0, i2o_max_drivers * sizeof(*i2o_drivers));
+
+	rc = bus_register(&i2o_bus_type);
+
+	if (rc < 0)
+		kfree(i2o_drivers);
+
+	return rc;
+};
+
+/**
+ *	i2o_driver_exit - clean up I2O drivers (OSMs)
+ *
+ *	Unregisters the I2O bus and free driver array.
+ */
+void __exit i2o_driver_exit(void)
+{
+	bus_unregister(&i2o_bus_type);
+	kfree(i2o_drivers);
+};
+
+EXPORT_SYMBOL(i2o_driver_register);
+EXPORT_SYMBOL(i2o_driver_unregister);

include/linux/i2o-dev.h

@@ -23,7 +23,7 @@
 /* How many controllers are we allowing */
 #define MAX_I2O_CONTROLLERS	32
 
-#include <linux/ioctl.h>
+//#include <linux/ioctl.h>
 
 /*
  * I2O Control IOCTLs and structures
@@ -42,6 +42,13 @@
 #define I2OEVTREG		_IOW(I2O_MAGIC_NUMBER,10,struct i2o_evt_id)
 #define I2OEVTGET		_IOR(I2O_MAGIC_NUMBER,11,struct i2o_evt_info)
 #define I2OPASSTHRU		_IOR(I2O_MAGIC_NUMBER,12,struct i2o_cmd_passthru)
+#define I2OPASSTHRU32		_IOR(I2O_MAGIC_NUMBER,12,struct i2o_cmd_passthru32)
+
+struct i2o_cmd_passthru32
+{
+	unsigned int iop;	/* IOP unit number */
+	u32 msg;		/* message */
+};
 
 struct i2o_cmd_passthru
 {
@@ -351,6 +358,7 @@ typedef struct _i2o_status_block
 #define I2O_CLASS_BUS_ADAPTER_PORT		0x080
 #define I2O_CLASS_PEER_TRANSPORT_AGENT		0x090
 #define I2O_CLASS_PEER_TRANSPORT		0x091
+#define	I2O_CLASS_END				0xfff
 
 /*
  *  Rest of 0x092 - 0x09f reserved for peer-to-peer classes