1 files changed, 614 insertions, 0 deletions
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
new file mode 100644
index 00000000000..9197e92d708
--- /dev/null
+++ b/drivers/infiniband/core/device.c
@@ -0,0 +1,614 @@
+/*
+ * Copyright (c) 2004 Topspin Communications.  All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * $Id: device.c 1349 2004-12-16 21:09:43Z roland $
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+
+#include <asm/semaphore.h>
+
+#include "core_priv.h"
+
+MODULE_AUTHOR("Roland Dreier");
+MODULE_DESCRIPTION("core kernel InfiniBand API");
+MODULE_LICENSE("Dual BSD/GPL");
+
+struct ib_client_data {
+	struct list_head  list;
+	struct ib_client *client;
+	void *            data;
+};
+
+static LIST_HEAD(device_list);
+static LIST_HEAD(client_list);
+
+/*
+ * device_sem protects access to both device_list and client_list.
+ * There's no real point to using multiple locks or something fancier
+ * like an rwsem: we always access both lists, and we're always
+ * modifying one list or the other list.  In any case this is not a
+ * hot path so there's no point in trying to optimize.
+ */
+static DECLARE_MUTEX(device_sem);
+
+static int ib_device_check_mandatory(struct ib_device *device)
+{
+#define IB_MANDATORY_FUNC(x) { offsetof(struct ib_device, x), #x }
+	static const struct {
+		size_t offset;
+		char  *name;
+	} mandatory_table[] = {
+		IB_MANDATORY_FUNC(query_device),
+		IB_MANDATORY_FUNC(query_port),
+		IB_MANDATORY_FUNC(query_pkey),
+		IB_MANDATORY_FUNC(query_gid),
+		IB_MANDATORY_FUNC(alloc_pd),
+		IB_MANDATORY_FUNC(dealloc_pd),
+		IB_MANDATORY_FUNC(create_ah),
+		IB_MANDATORY_FUNC(destroy_ah),
+		IB_MANDATORY_FUNC(create_qp),
+		IB_MANDATORY_FUNC(modify_qp),
+		IB_MANDATORY_FUNC(destroy_qp),
+		IB_MANDATORY_FUNC(post_send),
+		IB_MANDATORY_FUNC(post_recv),
+		IB_MANDATORY_FUNC(create_cq),
+		IB_MANDATORY_FUNC(destroy_cq),
+		IB_MANDATORY_FUNC(poll_cq),
+		IB_MANDATORY_FUNC(req_notify_cq),
+		IB_MANDATORY_FUNC(get_dma_mr),
+		IB_MANDATORY_FUNC(dereg_mr)
+	};
+	int i;
+
+	for (i = 0; i < sizeof mandatory_table / sizeof mandatory_table[0]; ++i) {
+		if (!*(void **) ((void *) device + mandatory_table[i].offset)) {
+			printk(KERN_WARNING "Device %s is missing mandatory function %s\n",
+			       device->name, mandatory_table[i].name);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static struct ib_device *__ib_device_get_by_name(const char *name)
+{
+	struct ib_device *device;
+
+	list_for_each_entry(device, &device_list, core_list)
+		if (!strncmp(name, device->name, IB_DEVICE_NAME_MAX))
+			return device;
+
+	return NULL;
+}
+
+
+static int alloc_name(char *name)
+{
+	long *inuse;
+	char buf[IB_DEVICE_NAME_MAX];
+	struct ib_device *device;
+	int i;
+
+	inuse = (long *) get_zeroed_page(GFP_KERNEL);
+	if (!inuse)
+		return -ENOMEM;
+
+	list_for_each_entry(device, &device_list, core_list) {
+		if (!sscanf(device->name, name, &i))
+			continue;
+		if (i < 0 || i >= PAGE_SIZE * 8)
+			continue;
+		snprintf(buf, sizeof buf, name, i);
+		if (!strncmp(buf, device->name, IB_DEVICE_NAME_MAX))
+			set_bit(i, inuse);
+	}
+
+	i = find_first_zero_bit(inuse, PAGE_SIZE * 8);
+	free_page((unsigned long) inuse);
+	snprintf(buf, sizeof buf, name, i);
+
+	if (__ib_device_get_by_name(buf))
+		return -ENFILE;
+
+	strlcpy(name, buf, IB_DEVICE_NAME_MAX);
+	return 0;
+}
+
+/**
+ * ib_alloc_device - allocate an IB device struct
+ * @size:size of structure to allocate
+ *
+ * Low-level drivers should use ib_alloc_device() to allocate &struct
+ * ib_device.  @size is the size of the structure to be allocated,
+ * including any private data used by the low-level driver.
+ * ib_dealloc_device() must be used to free structures allocated with
+ * ib_alloc_device().
+ */
+struct ib_device *ib_alloc_device(size_t size)
+{
+	void *dev;
+
+	BUG_ON(size < sizeof (struct ib_device));
+
+	dev = kmalloc(size, GFP_KERNEL);
+	if (!dev)
+		return NULL;
+
+	memset(dev, 0, size);
+
+	return dev;
+}
+EXPORT_SYMBOL(ib_alloc_device);
+
+/**
+ * ib_dealloc_device - free an IB device struct
+ * @device:structure to free
+ *
+ * Free a structure allocated with ib_alloc_device().
+ */
+void ib_dealloc_device(struct ib_device *device)
+{
+	if (device->reg_state == IB_DEV_UNINITIALIZED) {
+		kfree(device);
+		return;
+	}
+
+	BUG_ON(device->reg_state != IB_DEV_UNREGISTERED);
+
+	ib_device_unregister_sysfs(device);
+}
+EXPORT_SYMBOL(ib_dealloc_device);
+
+static int add_client_context(struct ib_device *device, struct ib_client *client)
+{
+	struct ib_client_data *context;
+	unsigned long flags;
+
+	context = kmalloc(sizeof *context, GFP_KERNEL);
+	if (!context) {
+		printk(KERN_WARNING "Couldn't allocate client context for %s/%s\n",
+		       device->name, client->name);
+		return -ENOMEM;
+	}
+
+	context->client = client;
+	context->data   = NULL;
+
+	spin_lock_irqsave(&device->client_data_lock, flags);
+	list_add(&context->list, &device->client_data_list);
+	spin_unlock_irqrestore(&device->client_data_lock, flags);
+
+	return 0;
+}
+
+/**
+ * ib_register_device - Register an IB device with IB core
+ * @device:Device to register
+ *
+ * Low-level drivers use ib_register_device() to register their
+ * devices with the IB core.  All registered clients will receive a
+ * callback for each device that is added. @device must be allocated
+ * with ib_alloc_device().
+ */
+int ib_register_device(struct ib_device *device)
+{
+	int ret;
+
+	down(&device_sem);
+
+	if (strchr(device->name, '%')) {
+		ret = alloc_name(device->name);
+		if (ret)
+			goto out;
+	}
+
+	if (ib_device_check_mandatory(device)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	INIT_LIST_HEAD(&device->event_handler_list);
+	INIT_LIST_HEAD(&device->client_data_list);
+	spin_lock_init(&device->event_handler_lock);
+	spin_lock_init(&device->client_data_lock);
+
+	ret = ib_device_register_sysfs(device);
+	if (ret) {
+		printk(KERN_WARNING "Couldn't register device %s with driver model\n",
+		       device->name);
+		goto out;
+	}
+
+	list_add_tail(&device->core_list, &device_list);
+
+	device->reg_state = IB_DEV_REGISTERED;
+
+	{
+		struct ib_client *client;
+
+		list_for_each_entry(client, &client_list, list)
+			if (client->add && !add_client_context(device, client))
+				client->add(device);
+	}
+
+ out:
+	up(&device_sem);
+	return ret;
+}
+EXPORT_SYMBOL(ib_register_device);
+
+/**
+ * ib_unregister_device - Unregister an IB device
+ * @device:Device to unregister
+ *
+ * Unregister an IB device.  All clients will receive a remove callback.
+ */
+void ib_unregister_device(struct ib_device *device)
+{
+	struct ib_client *client;
+	struct ib_client_data *context, *tmp;
+	unsigned long flags;
+
+	down(&device_sem);
+
+	list_for_each_entry_reverse(client, &client_list, list)
+		if (client->remove)
+			client->remove(device);
+
+	list_del(&device->core_list);
+
+	up(&device_sem);
+
+	spin_lock_irqsave(&device->client_data_lock, flags);
+	list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
+		kfree(context);
+	spin_unlock_irqrestore(&device->client_data_lock, flags);
+
+	device->reg_state = IB_DEV_UNREGISTERED;
+}
+EXPORT_SYMBOL(ib_unregister_device);
+
+/**
+ * ib_register_client - Register an IB client
+ * @client:Client to register
+ *
+ * Upper level users of the IB drivers can use ib_register_client() to
+ * register callbacks for IB device addition and removal.  When an IB
+ * device is added, each registered client's add method will be called
+ * (in the order the clients were registered), and when a device is
+ * removed, each client's remove method will be called (in the reverse
+ * order that clients were registered).  In addition, when
+ * ib_register_client() is called, the client will receive an add
+ * callback for all devices already registered.
+ */
+int ib_register_client(struct ib_client *client)
+{
+	struct ib_device *device;
+
+	down(&device_sem);
+
+	list_add_tail(&client->list, &client_list);
+	list_for_each_entry(device, &device_list, core_list)
+		if (client->add && !add_client_context(device, client))
+			client->add(device);
+
+	up(&device_sem);
+
+	return 0;
+}
+EXPORT_SYMBOL(ib_register_client);
+
+/**
+ * ib_unregister_client - Unregister an IB client
+ * @client:Client to unregister
+ *
+ * Upper level users use ib_unregister_client() to remove their client
+ * registration.  When ib_unregister_client() is called, the client
+ * will receive a remove callback for each IB device still registered.
+ */
+void ib_unregister_client(struct ib_client *client)
+{
+	struct ib_client_data *context, *tmp;
+	struct ib_device *device;
+	unsigned long flags;
+
+	down(&device_sem);
+
+	list_for_each_entry(device, &device_list, core_list) {
+		if (client->remove)
+			client->remove(device);
+
+		spin_lock_irqsave(&device->client_data_lock, flags);
+		list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
+			if (context->client == client) {
+				list_del(&context->list);
+				kfree(context);
+			}
+		spin_unlock_irqrestore(&device->client_data_lock, flags);
+	}
+	list_del(&client->list);
+
+	up(&device_sem);
+}
+EXPORT_SYMBOL(ib_unregister_client);
+
+/**
+ * ib_get_client_data - Get IB client context
+ * @device:Device to get context for
+ * @client:Client to get context for
+ *
+ * ib_get_client_data() returns client context set with
+ * ib_set_client_data().
+ */
+void *ib_get_client_data(struct ib_device *device, struct ib_client *client)
+{
+	struct ib_client_data *context;
+	void *ret = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&device->client_data_lock, flags);
+	list_for_each_entry(context, &device->client_data_list, list)
+		if (context->client == client) {
+			ret = context->data;
+			break;
+		}
+	spin_unlock_irqrestore(&device->client_data_lock, flags);
+
+	return ret;
+}
+EXPORT_SYMBOL(ib_get_client_data);
+
+/**
+ * ib_set_client_data - Get IB client context
+ * @device:Device to set context for
+ * @client:Client to set context for
+ * @data:Context to set
+ *
+ * ib_set_client_data() sets client context that can be retrieved with
+ * ib_get_client_data().
+ */
+void ib_set_client_data(struct ib_device *device, struct ib_client *client,
+			void *data)
+{
+	struct ib_client_data *context;
+	unsigned long flags;
+
+	spin_lock_irqsave(&device->client_data_lock, flags);
+	list_for_each_entry(context, &device->client_data_list, list)
+		if (context->client == client) {
+			context->data = data;
+			goto out;
+		}
+
+	printk(KERN_WARNING "No client context found for %s/%s\n",
+	       device->name, client->name);
+
+out:
+	spin_unlock_irqrestore(&device->client_data_lock, flags);
+}
+EXPORT_SYMBOL(ib_set_client_data);
+
+/**
+ * ib_register_event_handler - Register an IB event handler
+ * @event_handler:Handler to register
+ *
+ * ib_register_event_handler() registers an event handler that will be
+ * called back when asynchronous IB events occur (as defined in
+ * chapter 11 of the InfiniBand Architecture Specification).  This
+ * callback may occur in interrupt context.
+ */
+int ib_register_event_handler  (struct ib_event_handler *event_handler)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
+	list_add_tail(&event_handler->list,
+		      &event_handler->device->event_handler_list);
+	spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL(ib_register_event_handler);
+
+/**
+ * ib_unregister_event_handler - Unregister an event handler
+ * @event_handler:Handler to unregister
+ *
+ * Unregister an event handler registered with
+ * ib_register_event_handler().
+ */
+int ib_unregister_event_handler(struct ib_event_handler *event_handler)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
+	list_del(&event_handler->list);
+	spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL(ib_unregister_event_handler);
+
+/**
+ * ib_dispatch_event - Dispatch an asynchronous event
+ * @event:Event to dispatch
+ *
+ * Low-level drivers must call ib_dispatch_event() to dispatch the
+ * event to all registered event handlers when an asynchronous event
+ * occurs.
+ */
+void ib_dispatch_event(struct ib_event *event)
+{
+	unsigned long flags;
+	struct ib_event_handler *handler;
+
+	spin_lock_irqsave(&event->device->event_handler_lock, flags);
+
+	list_for_each_entry(handler, &event->device->event_handler_list, list)
+		handler->handler(handler, event);
+
+	spin_unlock_irqrestore(&event->device->event_handler_lock, flags);
+}
+EXPORT_SYMBOL(ib_dispatch_event);
+
+/**
+ * ib_query_device - Query IB device attributes
+ * @device:Device to query
+ * @device_attr:Device attributes
+ *
+ * ib_query_device() returns the attributes of a device through the
+ * @device_attr pointer.
+ */
+int ib_query_device(struct ib_device *device,
+		    struct ib_device_attr *device_attr)
+{
+	return device->query_device(device, device_attr);
+}
+EXPORT_SYMBOL(ib_query_device);
+
+/**
+ * ib_query_port - Query IB port attributes
+ * @device:Device to query
+ * @port_num:Port number to query
+ * @port_attr:Port attributes
+ *
+ * ib_query_port() returns the attributes of a port through the
+ * @port_attr pointer.
+ */
+int ib_query_port(struct ib_device *device,
+		  u8 port_num,
+		  struct ib_port_attr *port_attr)
+{
+	return device->query_port(device, port_num, port_attr);
+}
+EXPORT_SYMBOL(ib_query_port);
+
+/**
+ * ib_query_gid - Get GID table entry
+ * @device:Device to query
+ * @port_num:Port number to query
+ * @index:GID table index to query
+ * @gid:Returned GID
+ *
+ * ib_query_gid() fetches the specified GID table entry.
+ */
+int ib_query_gid(struct ib_device *device,
+		 u8 port_num, int index, union ib_gid *gid)
+{
+	return device->query_gid(device, port_num, index, gid);
+}
+EXPORT_SYMBOL(ib_query_gid);
+
+/**
+ * ib_query_pkey - Get P_Key table entry
+ * @device:Device to query
+ * @port_num:Port number to query
+ * @index:P_Key table index to query
+ * @pkey:Returned P_Key
+ *
+ * ib_query_pkey() fetches the specified P_Key table entry.
+ */
+int ib_query_pkey(struct ib_device *device,
+		  u8 port_num, u16 index, u16 *pkey)
+{
+	return device->query_pkey(device, port_num, index, pkey);
+}
+EXPORT_SYMBOL(ib_query_pkey);
+
+/**
+ * ib_modify_device - Change IB device attributes
+ * @device:Device to modify
+ * @device_modify_mask:Mask of attributes to change
+ * @device_modify:New attribute values
+ *
+ * ib_modify_device() changes a device's attributes as specified by
+ * the @device_modify_mask and @device_modify structure.
+ */
+int ib_modify_device(struct ib_device *device,
+		     int device_modify_mask,
+		     struct ib_device_modify *device_modify)
+{
+	return device->modify_device(device, device_modify_mask,
+				     device_modify);
+}
+EXPORT_SYMBOL(ib_modify_device);
+
+/**
+ * ib_modify_port - Modifies the attributes for the specified port.
+ * @device: The device to modify.
+ * @port_num: The number of the port to modify.
+ * @port_modify_mask: Mask used to specify which attributes of the port
+ *   to change.
+ * @port_modify: New attribute values for the port.
+ *
+ * ib_modify_port() changes a port's attributes as specified by the
+ * @port_modify_mask and @port_modify structure.
+ */
+int ib_modify_port(struct ib_device *device,
+		   u8 port_num, int port_modify_mask,
+		   struct ib_port_modify *port_modify)
+{
+	return device->modify_port(device, port_num, port_modify_mask,
+				   port_modify);
+}
+EXPORT_SYMBOL(ib_modify_port);
+
+static int __init ib_core_init(void)
+{
+	int ret;
+
+	ret = ib_sysfs_setup();
+	if (ret)
+		printk(KERN_WARNING "Couldn't create InfiniBand device class\n");
+
+	ret = ib_cache_setup();
+	if (ret) {
+		printk(KERN_WARNING "Couldn't set up InfiniBand P_Key/GID cache\n");
+		ib_sysfs_cleanup();
+	}
+
+	return ret;
+}
+
+static void __exit ib_core_cleanup(void)
+{
+	ib_cache_cleanup();
+	ib_sysfs_cleanup();
+}
+
+module_init(ib_core_init);
+module_exit(ib_core_cleanup);