![Krishna Kumar](/assets/img/avatar_default.png)
Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
619 lines
17 KiB
C
619 lines
17 KiB
C
/*
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* Copyright (c) 2004 Topspin Communications. All rights reserved.
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* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* $Id: device.c 1349 2004-12-16 21:09:43Z roland $
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include "core_priv.h"
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MODULE_AUTHOR("Roland Dreier");
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MODULE_DESCRIPTION("core kernel InfiniBand API");
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MODULE_LICENSE("Dual BSD/GPL");
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struct ib_client_data {
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struct list_head list;
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struct ib_client *client;
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void * data;
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};
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static LIST_HEAD(device_list);
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static LIST_HEAD(client_list);
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/*
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* device_mutex protects access to both device_list and client_list.
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* There's no real point to using multiple locks or something fancier
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* like an rwsem: we always access both lists, and we're always
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* modifying one list or the other list. In any case this is not a
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* hot path so there's no point in trying to optimize.
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*/
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static DEFINE_MUTEX(device_mutex);
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static int ib_device_check_mandatory(struct ib_device *device)
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{
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#define IB_MANDATORY_FUNC(x) { offsetof(struct ib_device, x), #x }
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static const struct {
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size_t offset;
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char *name;
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} mandatory_table[] = {
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IB_MANDATORY_FUNC(query_device),
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IB_MANDATORY_FUNC(query_port),
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IB_MANDATORY_FUNC(query_pkey),
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IB_MANDATORY_FUNC(query_gid),
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IB_MANDATORY_FUNC(alloc_pd),
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IB_MANDATORY_FUNC(dealloc_pd),
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IB_MANDATORY_FUNC(create_ah),
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IB_MANDATORY_FUNC(destroy_ah),
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IB_MANDATORY_FUNC(create_qp),
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IB_MANDATORY_FUNC(modify_qp),
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IB_MANDATORY_FUNC(destroy_qp),
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IB_MANDATORY_FUNC(post_send),
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IB_MANDATORY_FUNC(post_recv),
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IB_MANDATORY_FUNC(create_cq),
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IB_MANDATORY_FUNC(destroy_cq),
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IB_MANDATORY_FUNC(poll_cq),
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IB_MANDATORY_FUNC(req_notify_cq),
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IB_MANDATORY_FUNC(get_dma_mr),
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IB_MANDATORY_FUNC(dereg_mr)
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};
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int i;
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for (i = 0; i < sizeof mandatory_table / sizeof mandatory_table[0]; ++i) {
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if (!*(void **) ((void *) device + mandatory_table[i].offset)) {
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printk(KERN_WARNING "Device %s is missing mandatory function %s\n",
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device->name, mandatory_table[i].name);
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return -EINVAL;
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}
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}
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return 0;
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}
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static struct ib_device *__ib_device_get_by_name(const char *name)
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{
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struct ib_device *device;
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list_for_each_entry(device, &device_list, core_list)
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if (!strncmp(name, device->name, IB_DEVICE_NAME_MAX))
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return device;
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return NULL;
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}
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static int alloc_name(char *name)
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{
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long *inuse;
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char buf[IB_DEVICE_NAME_MAX];
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struct ib_device *device;
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int i;
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inuse = (long *) get_zeroed_page(GFP_KERNEL);
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if (!inuse)
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return -ENOMEM;
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list_for_each_entry(device, &device_list, core_list) {
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if (!sscanf(device->name, name, &i))
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continue;
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if (i < 0 || i >= PAGE_SIZE * 8)
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continue;
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snprintf(buf, sizeof buf, name, i);
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if (!strncmp(buf, device->name, IB_DEVICE_NAME_MAX))
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set_bit(i, inuse);
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}
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i = find_first_zero_bit(inuse, PAGE_SIZE * 8);
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free_page((unsigned long) inuse);
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snprintf(buf, sizeof buf, name, i);
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if (__ib_device_get_by_name(buf))
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return -ENFILE;
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strlcpy(name, buf, IB_DEVICE_NAME_MAX);
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return 0;
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}
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/**
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* ib_alloc_device - allocate an IB device struct
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* @size:size of structure to allocate
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*
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* Low-level drivers should use ib_alloc_device() to allocate &struct
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* ib_device. @size is the size of the structure to be allocated,
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* including any private data used by the low-level driver.
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* ib_dealloc_device() must be used to free structures allocated with
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* ib_alloc_device().
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*/
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struct ib_device *ib_alloc_device(size_t size)
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{
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BUG_ON(size < sizeof (struct ib_device));
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return kzalloc(size, GFP_KERNEL);
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}
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EXPORT_SYMBOL(ib_alloc_device);
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/**
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* ib_dealloc_device - free an IB device struct
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* @device:structure to free
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*
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* Free a structure allocated with ib_alloc_device().
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*/
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void ib_dealloc_device(struct ib_device *device)
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{
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if (device->reg_state == IB_DEV_UNINITIALIZED) {
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kfree(device);
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return;
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}
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BUG_ON(device->reg_state != IB_DEV_UNREGISTERED);
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ib_device_unregister_sysfs(device);
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}
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EXPORT_SYMBOL(ib_dealloc_device);
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static int add_client_context(struct ib_device *device, struct ib_client *client)
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{
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struct ib_client_data *context;
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unsigned long flags;
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context = kmalloc(sizeof *context, GFP_KERNEL);
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if (!context) {
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printk(KERN_WARNING "Couldn't allocate client context for %s/%s\n",
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device->name, client->name);
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return -ENOMEM;
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}
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context->client = client;
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context->data = NULL;
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spin_lock_irqsave(&device->client_data_lock, flags);
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list_add(&context->list, &device->client_data_list);
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spin_unlock_irqrestore(&device->client_data_lock, flags);
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return 0;
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}
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/**
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* ib_register_device - Register an IB device with IB core
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* @device:Device to register
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*
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* Low-level drivers use ib_register_device() to register their
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* devices with the IB core. All registered clients will receive a
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* callback for each device that is added. @device must be allocated
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* with ib_alloc_device().
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*/
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int ib_register_device(struct ib_device *device)
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{
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int ret;
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mutex_lock(&device_mutex);
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if (strchr(device->name, '%')) {
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ret = alloc_name(device->name);
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if (ret)
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goto out;
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}
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if (ib_device_check_mandatory(device)) {
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ret = -EINVAL;
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goto out;
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}
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INIT_LIST_HEAD(&device->event_handler_list);
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INIT_LIST_HEAD(&device->client_data_list);
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spin_lock_init(&device->event_handler_lock);
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spin_lock_init(&device->client_data_lock);
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ret = ib_device_register_sysfs(device);
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if (ret) {
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printk(KERN_WARNING "Couldn't register device %s with driver model\n",
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device->name);
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goto out;
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}
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list_add_tail(&device->core_list, &device_list);
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device->reg_state = IB_DEV_REGISTERED;
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{
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struct ib_client *client;
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list_for_each_entry(client, &client_list, list)
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if (client->add && !add_client_context(device, client))
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client->add(device);
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}
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out:
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mutex_unlock(&device_mutex);
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return ret;
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}
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EXPORT_SYMBOL(ib_register_device);
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/**
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* ib_unregister_device - Unregister an IB device
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* @device:Device to unregister
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*
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* Unregister an IB device. All clients will receive a remove callback.
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*/
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void ib_unregister_device(struct ib_device *device)
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{
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struct ib_client *client;
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struct ib_client_data *context, *tmp;
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unsigned long flags;
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mutex_lock(&device_mutex);
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list_for_each_entry_reverse(client, &client_list, list)
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if (client->remove)
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client->remove(device);
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list_del(&device->core_list);
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mutex_unlock(&device_mutex);
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spin_lock_irqsave(&device->client_data_lock, flags);
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list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
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kfree(context);
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spin_unlock_irqrestore(&device->client_data_lock, flags);
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device->reg_state = IB_DEV_UNREGISTERED;
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}
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EXPORT_SYMBOL(ib_unregister_device);
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/**
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* ib_register_client - Register an IB client
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* @client:Client to register
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*
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* Upper level users of the IB drivers can use ib_register_client() to
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* register callbacks for IB device addition and removal. When an IB
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* device is added, each registered client's add method will be called
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* (in the order the clients were registered), and when a device is
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* removed, each client's remove method will be called (in the reverse
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* order that clients were registered). In addition, when
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* ib_register_client() is called, the client will receive an add
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* callback for all devices already registered.
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*/
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int ib_register_client(struct ib_client *client)
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{
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struct ib_device *device;
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mutex_lock(&device_mutex);
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list_add_tail(&client->list, &client_list);
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list_for_each_entry(device, &device_list, core_list)
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if (client->add && !add_client_context(device, client))
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client->add(device);
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mutex_unlock(&device_mutex);
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return 0;
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}
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EXPORT_SYMBOL(ib_register_client);
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/**
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* ib_unregister_client - Unregister an IB client
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* @client:Client to unregister
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*
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* Upper level users use ib_unregister_client() to remove their client
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* registration. When ib_unregister_client() is called, the client
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* will receive a remove callback for each IB device still registered.
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*/
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void ib_unregister_client(struct ib_client *client)
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{
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struct ib_client_data *context, *tmp;
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struct ib_device *device;
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unsigned long flags;
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mutex_lock(&device_mutex);
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list_for_each_entry(device, &device_list, core_list) {
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if (client->remove)
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client->remove(device);
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spin_lock_irqsave(&device->client_data_lock, flags);
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list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
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if (context->client == client) {
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list_del(&context->list);
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kfree(context);
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}
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spin_unlock_irqrestore(&device->client_data_lock, flags);
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}
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list_del(&client->list);
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mutex_unlock(&device_mutex);
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}
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EXPORT_SYMBOL(ib_unregister_client);
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/**
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* ib_get_client_data - Get IB client context
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* @device:Device to get context for
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* @client:Client to get context for
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*
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* ib_get_client_data() returns client context set with
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* ib_set_client_data().
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*/
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void *ib_get_client_data(struct ib_device *device, struct ib_client *client)
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{
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struct ib_client_data *context;
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void *ret = NULL;
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unsigned long flags;
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spin_lock_irqsave(&device->client_data_lock, flags);
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list_for_each_entry(context, &device->client_data_list, list)
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if (context->client == client) {
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ret = context->data;
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break;
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}
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spin_unlock_irqrestore(&device->client_data_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(ib_get_client_data);
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/**
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* ib_set_client_data - Set IB client context
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* @device:Device to set context for
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* @client:Client to set context for
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* @data:Context to set
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*
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* ib_set_client_data() sets client context that can be retrieved with
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* ib_get_client_data().
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*/
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void ib_set_client_data(struct ib_device *device, struct ib_client *client,
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void *data)
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{
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struct ib_client_data *context;
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unsigned long flags;
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spin_lock_irqsave(&device->client_data_lock, flags);
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list_for_each_entry(context, &device->client_data_list, list)
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if (context->client == client) {
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context->data = data;
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goto out;
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}
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printk(KERN_WARNING "No client context found for %s/%s\n",
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device->name, client->name);
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out:
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spin_unlock_irqrestore(&device->client_data_lock, flags);
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}
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EXPORT_SYMBOL(ib_set_client_data);
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/**
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* ib_register_event_handler - Register an IB event handler
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* @event_handler:Handler to register
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*
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* ib_register_event_handler() registers an event handler that will be
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* called back when asynchronous IB events occur (as defined in
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* chapter 11 of the InfiniBand Architecture Specification). This
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* callback may occur in interrupt context.
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*/
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int ib_register_event_handler (struct ib_event_handler *event_handler)
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{
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unsigned long flags;
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spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
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list_add_tail(&event_handler->list,
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&event_handler->device->event_handler_list);
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spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(ib_register_event_handler);
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/**
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* ib_unregister_event_handler - Unregister an event handler
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* @event_handler:Handler to unregister
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*
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* Unregister an event handler registered with
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* ib_register_event_handler().
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*/
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int ib_unregister_event_handler(struct ib_event_handler *event_handler)
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{
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unsigned long flags;
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spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
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list_del(&event_handler->list);
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spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(ib_unregister_event_handler);
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/**
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* ib_dispatch_event - Dispatch an asynchronous event
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* @event:Event to dispatch
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*
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* Low-level drivers must call ib_dispatch_event() to dispatch the
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* event to all registered event handlers when an asynchronous event
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* occurs.
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*/
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void ib_dispatch_event(struct ib_event *event)
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{
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unsigned long flags;
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struct ib_event_handler *handler;
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spin_lock_irqsave(&event->device->event_handler_lock, flags);
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list_for_each_entry(handler, &event->device->event_handler_list, list)
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handler->handler(handler, event);
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spin_unlock_irqrestore(&event->device->event_handler_lock, flags);
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}
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EXPORT_SYMBOL(ib_dispatch_event);
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/**
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* ib_query_device - Query IB device attributes
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* @device:Device to query
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* @device_attr:Device attributes
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*
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* ib_query_device() returns the attributes of a device through the
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* @device_attr pointer.
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*/
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int ib_query_device(struct ib_device *device,
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struct ib_device_attr *device_attr)
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{
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return device->query_device(device, device_attr);
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}
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EXPORT_SYMBOL(ib_query_device);
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|
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/**
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* ib_query_port - Query IB port attributes
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* @device:Device to query
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* @port_num:Port number to query
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* @port_attr:Port attributes
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*
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* ib_query_port() returns the attributes of a port through the
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* @port_attr pointer.
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*/
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int ib_query_port(struct ib_device *device,
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u8 port_num,
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struct ib_port_attr *port_attr)
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{
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if (device->node_type == RDMA_NODE_IB_SWITCH) {
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if (port_num)
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return -EINVAL;
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} else if (port_num < 1 || port_num > device->phys_port_cnt)
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return -EINVAL;
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return device->query_port(device, port_num, port_attr);
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}
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EXPORT_SYMBOL(ib_query_port);
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/**
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* ib_query_gid - Get GID table entry
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* @device:Device to query
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* @port_num:Port number to query
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* @index:GID table index to query
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* @gid:Returned GID
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*
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* ib_query_gid() fetches the specified GID table entry.
|
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*/
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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)
|
|
{
|
|
if (device->node_type == RDMA_NODE_IB_SWITCH) {
|
|
if (port_num)
|
|
return -EINVAL;
|
|
} else if (port_num < 1 || port_num > device->phys_port_cnt)
|
|
return -EINVAL;
|
|
|
|
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);
|