diff options
Diffstat (limited to 'drivers/infiniband/core/device.c')
| -rw-r--r-- | drivers/infiniband/core/device.c | 614 |
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); |