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/*
* Intel MIC Platform Software Stack (MPSS)
*
* Copyright(c) 2014 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* Intel SCIF driver.
*
*/
#include "scif_main.h"
static int scif_fdopen(struct inode *inode, struct file *f)
{
struct scif_endpt *priv = scif_open();
if (!priv)
return -ENOMEM;
f->private_data = priv;
return 0;
}
static int scif_fdclose(struct inode *inode, struct file *f)
{
struct scif_endpt *priv = f->private_data;
return scif_close(priv);
}
static int scif_fdflush(struct file *f, fl_owner_t id)
{
struct scif_endpt *ep = f->private_data;
spin_lock(&ep->lock);
/*
* The listening endpoint stashes the open file information before
* waiting for incoming connections. The release callback would never be
* called if the application closed the endpoint, while waiting for
* incoming connections from a separate thread since the file descriptor
* reference count is bumped up in the accept IOCTL. Call the flush
* routine if the id matches the endpoint open file information so that
* the listening endpoint can be woken up and the fd released.
*/
if (ep->files == id)
__scif_flush(ep);
spin_unlock(&ep->lock);
return 0;
}
static __always_inline void scif_err_debug(int err, const char *str)
{
/*
* ENOTCONN is a common uninteresting error which is
* flooding debug messages to the console unnecessarily.
*/
if (err < 0 && err != -ENOTCONN)
dev_dbg(scif_info.mdev.this_device, "%s err %d\n", str, err);
}
static long scif_fdioctl(struct file *f, unsigned int cmd, unsigned long arg)
{
struct scif_endpt *priv = f->private_data;
void __user *argp = (void __user *)arg;
int err = 0;
bool non_block = false;
non_block = !!(f->f_flags & O_NONBLOCK);
switch (cmd) {
case SCIF_BIND:
{
int pn;
if (copy_from_user(&pn, argp, sizeof(pn)))
return -EFAULT;
pn = scif_bind(priv, pn);
if (pn < 0)
return pn;
if (copy_to_user(argp, &pn, sizeof(pn)))
return -EFAULT;
return 0;
}
case SCIF_LISTEN:
return scif_listen(priv, arg);
case SCIF_CONNECT:
{
struct scifioctl_connect req;
struct scif_endpt *ep = (struct scif_endpt *)priv;
if (copy_from_user(&req, argp, sizeof(req)))
return -EFAULT;
err = __scif_connect(priv, &req.peer, non_block);
if (err < 0)
return err;
req.self.node = ep->port.node;
req.self.port = ep->port.port;
if (copy_to_user(argp, &req, sizeof(req)))
return -EFAULT;
return 0;
}
/*
* Accept is done in two halves. The request ioctl does the basic
* functionality of accepting the request and returning the information
* about it including the internal ID of the end point. The register
* is done with the internal ID on a new file descriptor opened by the
* requesting process.
*/
case SCIF_ACCEPTREQ:
{
struct scifioctl_accept request;
scif_epd_t *ep = (scif_epd_t *)&request.endpt;
if (copy_from_user(&request, argp, sizeof(request)))
return -EFAULT;
err = scif_accept(priv, &request.peer, ep, request.flags);
if (err < 0)
return err;
if (copy_to_user(argp, &request, sizeof(request))) {
scif_close(*ep);
return -EFAULT;
}
/*
* Add to the list of user mode eps where the second half
* of the accept is not yet completed.
*/
spin_lock(&scif_info.eplock);
list_add_tail(&((*ep)->miacceptlist), &scif_info.uaccept);
list_add_tail(&((*ep)->liacceptlist), &priv->li_accept);
(*ep)->listenep = priv;
priv->acceptcnt++;
spin_unlock(&scif_info.eplock);
return 0;
}
case SCIF_ACCEPTREG:
{
struct scif_endpt *priv = f->private_data;
struct scif_endpt *newep;
struct scif_endpt *lisep;
struct scif_endpt *fep = NULL;
struct scif_endpt *tmpep;
struct list_head *pos, *tmpq;
/* Finally replace the pointer to the accepted endpoint */
if (copy_from_user(&newep, argp, sizeof(void *)))
return -EFAULT;
/* Remove form the user accept queue */
spin_lock(&scif_info.eplock);
list_for_each_safe(pos, tmpq, &scif_info.uaccept) {
tmpep = list_entry(pos,
struct scif_endpt, miacceptlist);
if (tmpep == newep) {
list_del(pos);
fep = tmpep;
break;
}
}
if (!fep) {
spin_unlock(&scif_info.eplock);
return -ENOENT;
}
lisep = newep->listenep;
list_for_each_safe(pos, tmpq, &lisep->li_accept) {
tmpep = list_entry(pos,
struct scif_endpt, liacceptlist);
if (tmpep == newep) {
list_del(pos);
lisep->acceptcnt--;
break;
}
}
spin_unlock(&scif_info.eplock);
/* Free the resources automatically created from the open. */
scif_teardown_ep(priv);
scif_add_epd_to_zombie_list(priv, !SCIF_EPLOCK_HELD);
f->private_data = newep;
return 0;
}
}
return -EINVAL;
}
const struct file_operations scif_fops = {
.open = scif_fdopen,
.release = scif_fdclose,
.unlocked_ioctl = scif_fdioctl,
.flush = scif_fdflush,
.owner = THIS_MODULE,
};
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