OpenCloudOS-Kernel/drivers/infiniband/core/uverbs_main.c

699 lines
18 KiB
C
Raw Normal View History

/*
* Copyright (c) 2005 Topspin Communications. All rights reserved.
* Copyright (c) 2005 Cisco Systems. 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: uverbs_main.c 2733 2005-06-28 19:14:34Z roland $
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <asm/uaccess.h>
#include "uverbs.h"
MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand userspace verbs access");
MODULE_LICENSE("Dual BSD/GPL");
#define INFINIBANDEVENTFS_MAGIC 0x49426576 /* "IBev" */
enum {
IB_UVERBS_MAJOR = 231,
IB_UVERBS_BASE_MINOR = 192,
IB_UVERBS_MAX_DEVICES = 32
};
#define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
DECLARE_MUTEX(ib_uverbs_idr_mutex);
DEFINE_IDR(ib_uverbs_pd_idr);
DEFINE_IDR(ib_uverbs_mr_idr);
DEFINE_IDR(ib_uverbs_mw_idr);
DEFINE_IDR(ib_uverbs_ah_idr);
DEFINE_IDR(ib_uverbs_cq_idr);
DEFINE_IDR(ib_uverbs_qp_idr);
static spinlock_t map_lock;
static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
const char __user *buf, int in_len,
int out_len) = {
[IB_USER_VERBS_CMD_QUERY_PARAMS] = ib_uverbs_query_params,
[IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context,
[IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device,
[IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port,
[IB_USER_VERBS_CMD_QUERY_GID] = ib_uverbs_query_gid,
[IB_USER_VERBS_CMD_QUERY_PKEY] = ib_uverbs_query_pkey,
[IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd,
[IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd,
[IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr,
[IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr,
[IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq,
[IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq,
[IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp,
[IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp,
[IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp,
[IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast,
[IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
};
static struct vfsmount *uverbs_event_mnt;
static void ib_uverbs_add_one(struct ib_device *device);
static void ib_uverbs_remove_one(struct ib_device *device);
static int ib_dealloc_ucontext(struct ib_ucontext *context)
{
struct ib_uobject *uobj, *tmp;
if (!context)
return 0;
down(&ib_uverbs_idr_mutex);
/* XXX Free AHs */
list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
idr_remove(&ib_uverbs_qp_idr, uobj->id);
ib_destroy_qp(qp);
list_del(&uobj->list);
kfree(uobj);
}
list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
idr_remove(&ib_uverbs_cq_idr, uobj->id);
ib_destroy_cq(cq);
list_del(&uobj->list);
kfree(uobj);
}
/* XXX Free SRQs */
/* XXX Free MWs */
list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
struct ib_umem_object *memobj;
idr_remove(&ib_uverbs_mr_idr, uobj->id);
ib_dereg_mr(mr);
memobj = container_of(uobj, struct ib_umem_object, uobject);
ib_umem_release_on_close(mr->device, &memobj->umem);
list_del(&uobj->list);
kfree(memobj);
}
list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
idr_remove(&ib_uverbs_pd_idr, uobj->id);
ib_dealloc_pd(pd);
list_del(&uobj->list);
kfree(uobj);
}
up(&ib_uverbs_idr_mutex);
return context->device->dealloc_ucontext(context);
}
static void ib_uverbs_release_file(struct kref *ref)
{
struct ib_uverbs_file *file =
container_of(ref, struct ib_uverbs_file, ref);
module_put(file->device->ib_dev->owner);
kfree(file);
}
static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
size_t count, loff_t *pos)
{
struct ib_uverbs_event_file *file = filp->private_data;
void *event;
int eventsz;
int ret = 0;
spin_lock_irq(&file->lock);
while (list_empty(&file->event_list) && file->fd >= 0) {
spin_unlock_irq(&file->lock);
if (filp->f_flags & O_NONBLOCK)
return -EAGAIN;
if (wait_event_interruptible(file->poll_wait,
!list_empty(&file->event_list) ||
file->fd < 0))
return -ERESTARTSYS;
spin_lock_irq(&file->lock);
}
if (file->fd < 0) {
spin_unlock_irq(&file->lock);
return -ENODEV;
}
if (file->is_async) {
event = list_entry(file->event_list.next,
struct ib_uverbs_async_event, list);
eventsz = sizeof (struct ib_uverbs_async_event_desc);
} else {
event = list_entry(file->event_list.next,
struct ib_uverbs_comp_event, list);
eventsz = sizeof (struct ib_uverbs_comp_event_desc);
}
if (eventsz > count) {
ret = -EINVAL;
event = NULL;
} else
list_del(file->event_list.next);
spin_unlock_irq(&file->lock);
if (event) {
if (copy_to_user(buf, event, eventsz))
ret = -EFAULT;
else
ret = eventsz;
}
kfree(event);
return ret;
}
static unsigned int ib_uverbs_event_poll(struct file *filp,
struct poll_table_struct *wait)
{
unsigned int pollflags = 0;
struct ib_uverbs_event_file *file = filp->private_data;
poll_wait(filp, &file->poll_wait, wait);
spin_lock_irq(&file->lock);
if (file->fd < 0)
pollflags = POLLERR;
else if (!list_empty(&file->event_list))
pollflags = POLLIN | POLLRDNORM;
spin_unlock_irq(&file->lock);
return pollflags;
}
static void ib_uverbs_event_release(struct ib_uverbs_event_file *file)
{
struct list_head *entry, *tmp;
spin_lock_irq(&file->lock);
if (file->fd != -1) {
file->fd = -1;
list_for_each_safe(entry, tmp, &file->event_list)
if (file->is_async)
kfree(list_entry(entry, struct ib_uverbs_async_event, list));
else
kfree(list_entry(entry, struct ib_uverbs_comp_event, list));
}
spin_unlock_irq(&file->lock);
}
static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
{
struct ib_uverbs_event_file *file = filp->private_data;
ib_uverbs_event_release(file);
kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
return 0;
}
static struct file_operations uverbs_event_fops = {
/*
* No .owner field since we artificially create event files,
* so there is no increment to the module reference count in
* the open path. All event files come from a uverbs command
* file, which already takes a module reference, so this is OK.
*/
.read = ib_uverbs_event_read,
.poll = ib_uverbs_event_poll,
.release = ib_uverbs_event_close
};
void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
{
struct ib_uverbs_file *file = cq_context;
struct ib_uverbs_comp_event *entry;
unsigned long flags;
entry = kmalloc(sizeof *entry, GFP_ATOMIC);
if (!entry)
return;
entry->desc.cq_handle = cq->uobject->user_handle;
spin_lock_irqsave(&file->comp_file[0].lock, flags);
list_add_tail(&entry->list, &file->comp_file[0].event_list);
spin_unlock_irqrestore(&file->comp_file[0].lock, flags);
wake_up_interruptible(&file->comp_file[0].poll_wait);
}
static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
__u64 element, __u64 event)
{
struct ib_uverbs_async_event *entry;
unsigned long flags;
entry = kmalloc(sizeof *entry, GFP_ATOMIC);
if (!entry)
return;
entry->desc.element = element;
entry->desc.event_type = event;
spin_lock_irqsave(&file->async_file.lock, flags);
list_add_tail(&entry->list, &file->async_file.event_list);
spin_unlock_irqrestore(&file->async_file.lock, flags);
wake_up_interruptible(&file->async_file.poll_wait);
}
void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
{
ib_uverbs_async_handler(context_ptr,
event->element.cq->uobject->user_handle,
event->event);
}
void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
{
ib_uverbs_async_handler(context_ptr,
event->element.qp->uobject->user_handle,
event->event);
}
static void ib_uverbs_event_handler(struct ib_event_handler *handler,
struct ib_event *event)
{
struct ib_uverbs_file *file =
container_of(handler, struct ib_uverbs_file, event_handler);
ib_uverbs_async_handler(file, event->element.port_num, event->event);
}
static int ib_uverbs_event_init(struct ib_uverbs_event_file *file,
struct ib_uverbs_file *uverbs_file)
{
struct file *filp;
spin_lock_init(&file->lock);
INIT_LIST_HEAD(&file->event_list);
init_waitqueue_head(&file->poll_wait);
file->uverbs_file = uverbs_file;
file->fd = get_unused_fd();
if (file->fd < 0)
return file->fd;
filp = get_empty_filp();
if (!filp) {
put_unused_fd(file->fd);
return -ENFILE;
}
filp->f_op = &uverbs_event_fops;
filp->f_vfsmnt = mntget(uverbs_event_mnt);
filp->f_dentry = dget(uverbs_event_mnt->mnt_root);
filp->f_mapping = filp->f_dentry->d_inode->i_mapping;
filp->f_flags = O_RDONLY;
filp->f_mode = FMODE_READ;
filp->private_data = file;
fd_install(file->fd, filp);
return 0;
}
static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
size_t count, loff_t *pos)
{
struct ib_uverbs_file *file = filp->private_data;
struct ib_uverbs_cmd_hdr hdr;
if (count < sizeof hdr)
return -EINVAL;
if (copy_from_user(&hdr, buf, sizeof hdr))
return -EFAULT;
if (hdr.in_words * 4 != count)
return -EINVAL;
if (hdr.command < 0 || hdr.command >= ARRAY_SIZE(uverbs_cmd_table))
return -EINVAL;
if (!file->ucontext &&
hdr.command != IB_USER_VERBS_CMD_QUERY_PARAMS &&
hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
return -EINVAL;
return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
hdr.in_words * 4, hdr.out_words * 4);
}
static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct ib_uverbs_file *file = filp->private_data;
if (!file->ucontext)
return -ENODEV;
else
return file->device->ib_dev->mmap(file->ucontext, vma);
}
static int ib_uverbs_open(struct inode *inode, struct file *filp)
{
struct ib_uverbs_device *dev =
container_of(inode->i_cdev, struct ib_uverbs_device, dev);
struct ib_uverbs_file *file;
int i = 0;
int ret;
if (!try_module_get(dev->ib_dev->owner))
return -ENODEV;
file = kmalloc(sizeof *file +
(dev->num_comp - 1) * sizeof (struct ib_uverbs_event_file),
GFP_KERNEL);
if (!file)
return -ENOMEM;
file->device = dev;
kref_init(&file->ref);
file->ucontext = NULL;
ret = ib_uverbs_event_init(&file->async_file, file);
if (ret)
goto err;
file->async_file.is_async = 1;
kref_get(&file->ref);
for (i = 0; i < dev->num_comp; ++i) {
ret = ib_uverbs_event_init(&file->comp_file[i], file);
if (ret)
goto err_async;
kref_get(&file->ref);
file->comp_file[i].is_async = 0;
}
filp->private_data = file;
INIT_IB_EVENT_HANDLER(&file->event_handler, dev->ib_dev,
ib_uverbs_event_handler);
if (ib_register_event_handler(&file->event_handler))
goto err_async;
return 0;
err_async:
while (i--)
ib_uverbs_event_release(&file->comp_file[i]);
ib_uverbs_event_release(&file->async_file);
err:
kref_put(&file->ref, ib_uverbs_release_file);
return ret;
}
static int ib_uverbs_close(struct inode *inode, struct file *filp)
{
struct ib_uverbs_file *file = filp->private_data;
int i;
ib_unregister_event_handler(&file->event_handler);
ib_uverbs_event_release(&file->async_file);
ib_dealloc_ucontext(file->ucontext);
for (i = 0; i < file->device->num_comp; ++i)
ib_uverbs_event_release(&file->comp_file[i]);
kref_put(&file->ref, ib_uverbs_release_file);
return 0;
}
static struct file_operations uverbs_fops = {
.owner = THIS_MODULE,
.write = ib_uverbs_write,
.open = ib_uverbs_open,
.release = ib_uverbs_close
};
static struct file_operations uverbs_mmap_fops = {
.owner = THIS_MODULE,
.write = ib_uverbs_write,
.mmap = ib_uverbs_mmap,
.open = ib_uverbs_open,
.release = ib_uverbs_close
};
static struct ib_client uverbs_client = {
.name = "uverbs",
.add = ib_uverbs_add_one,
.remove = ib_uverbs_remove_one
};
static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
{
struct ib_uverbs_device *dev =
container_of(class_dev, struct ib_uverbs_device, class_dev);
return sprintf(buf, "%s\n", dev->ib_dev->name);
}
static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
static void ib_uverbs_release_class_dev(struct class_device *class_dev)
{
struct ib_uverbs_device *dev =
container_of(class_dev, struct ib_uverbs_device, class_dev);
cdev_del(&dev->dev);
clear_bit(dev->devnum, dev_map);
kfree(dev);
}
static struct class uverbs_class = {
.name = "infiniband_verbs",
.release = ib_uverbs_release_class_dev
};
static ssize_t show_abi_version(struct class *class, char *buf)
{
return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
}
static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
static void ib_uverbs_add_one(struct ib_device *device)
{
struct ib_uverbs_device *uverbs_dev;
if (!device->alloc_ucontext)
return;
uverbs_dev = kmalloc(sizeof *uverbs_dev, GFP_KERNEL);
if (!uverbs_dev)
return;
memset(uverbs_dev, 0, sizeof *uverbs_dev);
spin_lock(&map_lock);
uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
spin_unlock(&map_lock);
goto err;
}
set_bit(uverbs_dev->devnum, dev_map);
spin_unlock(&map_lock);
uverbs_dev->ib_dev = device;
uverbs_dev->num_comp = 1;
if (device->mmap)
cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops);
else
cdev_init(&uverbs_dev->dev, &uverbs_fops);
uverbs_dev->dev.owner = THIS_MODULE;
kobject_set_name(&uverbs_dev->dev.kobj, "uverbs%d", uverbs_dev->devnum);
if (cdev_add(&uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
goto err;
uverbs_dev->class_dev.class = &uverbs_class;
uverbs_dev->class_dev.dev = device->dma_device;
uverbs_dev->class_dev.devt = uverbs_dev->dev.dev;
snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum);
if (class_device_register(&uverbs_dev->class_dev))
goto err_cdev;
if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev))
goto err_class;
ib_set_client_data(device, &uverbs_client, uverbs_dev);
return;
err_class:
class_device_unregister(&uverbs_dev->class_dev);
err_cdev:
cdev_del(&uverbs_dev->dev);
clear_bit(uverbs_dev->devnum, dev_map);
err:
kfree(uverbs_dev);
return;
}
static void ib_uverbs_remove_one(struct ib_device *device)
{
struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
if (!uverbs_dev)
return;
class_device_unregister(&uverbs_dev->class_dev);
}
static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data)
{
return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
INFINIBANDEVENTFS_MAGIC);
}
static struct file_system_type uverbs_event_fs = {
/* No owner field so module can be unloaded */
.name = "infinibandeventfs",
.get_sb = uverbs_event_get_sb,
.kill_sb = kill_litter_super
};
static int __init ib_uverbs_init(void)
{
int ret;
spin_lock_init(&map_lock);
ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
"infiniband_verbs");
if (ret) {
printk(KERN_ERR "user_verbs: couldn't register device number\n");
goto out;
}
ret = class_register(&uverbs_class);
if (ret) {
printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
goto out_chrdev;
}
ret = class_create_file(&uverbs_class, &class_attr_abi_version);
if (ret) {
printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
goto out_class;
}
ret = register_filesystem(&uverbs_event_fs);
if (ret) {
printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
goto out_class;
}
uverbs_event_mnt = kern_mount(&uverbs_event_fs);
if (IS_ERR(uverbs_event_mnt)) {
ret = PTR_ERR(uverbs_event_mnt);
printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
goto out_fs;
}
ret = ib_register_client(&uverbs_client);
if (ret) {
printk(KERN_ERR "user_verbs: couldn't register client\n");
goto out_mnt;
}
return 0;
out_mnt:
mntput(uverbs_event_mnt);
out_fs:
unregister_filesystem(&uverbs_event_fs);
out_class:
class_unregister(&uverbs_class);
out_chrdev:
unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
out:
return ret;
}
static void __exit ib_uverbs_cleanup(void)
{
ib_unregister_client(&uverbs_client);
mntput(uverbs_event_mnt);
unregister_filesystem(&uverbs_event_fs);
class_unregister(&uverbs_class);
unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
}
module_init(ib_uverbs_init);
module_exit(ib_uverbs_cleanup);