drivers/misc/mic/scif/scif_fd.c

   1 /*
   2  * Intel MIC Platform Software Stack (MPSS)
   3  *
   4  * Copyright(c) 2014 Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License, version 2, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * Intel SCIF driver.
  16  *
  17  */
  18 #include "scif_main.h"
  19
  20 static int scif_fdopen(struct inode *inode, struct file *f)
  21 {
  22         struct scif_endpt *priv = scif_open();
  23
  24         if (!priv)
  25                 return -ENOMEM;
  26         f->private_data = priv;
  27         return 0;
  28 }
  29
  30 static int scif_fdclose(struct inode *inode, struct file *f)
  31 {
  32         struct scif_endpt *priv = f->private_data;
  33
  34         return scif_close(priv);
  35 }
  36
  37 static int scif_fdmmap(struct file *f, struct vm_area_struct *vma)
  38 {
  39         struct scif_endpt *priv = f->private_data;
  40
  41         return scif_mmap(vma, priv);
  42 }
  43
  44 static __poll_t scif_fdpoll(struct file *f, poll_table *wait)
  45 {
  46         struct scif_endpt *priv = f->private_data;
  47
  48         return __scif_pollfd(f, wait, priv);
  49 }
  50
  51 static int scif_fdflush(struct file *f, fl_owner_t id)
  52 {
  53         struct scif_endpt *ep = f->private_data;
  54
  55         spin_lock(&ep->lock);
  56         /*
  57          * The listening endpoint stashes the open file information before
  58          * waiting for incoming connections. The release callback would never be
  59          * called if the application closed the endpoint, while waiting for
  60          * incoming connections from a separate thread since the file descriptor
  61          * reference count is bumped up in the accept IOCTL. Call the flush
  62          * routine if the id matches the endpoint open file information so that
  63          * the listening endpoint can be woken up and the fd released.
  64          */
  65         if (ep->files == id)
  66                 __scif_flush(ep);
  67         spin_unlock(&ep->lock);
  68         return 0;
  69 }
  70
  71 static __always_inline void scif_err_debug(int err, const char *str)
  72 {
  73         /*
  74          * ENOTCONN is a common uninteresting error which is
  75          * flooding debug messages to the console unnecessarily.
  76          */
  77         if (err < 0 && err != -ENOTCONN)
  78                 dev_dbg(scif_info.mdev.this_device, "%s err %d\n", str, err);
  79 }
  80
  81 static long scif_fdioctl(struct file *f, unsigned int cmd, unsigned long arg)
  82 {
  83         struct scif_endpt *priv = f->private_data;
  84         void __user *argp = (void __user *)arg;
  85         int err = 0;
  86         struct scifioctl_msg request;
  87         bool non_block = false;
  88
  89         non_block = !!(f->f_flags & O_NONBLOCK);
  90
  91         switch (cmd) {
  92         case SCIF_BIND:
  93         {
  94                 int pn;
  95
  96                 if (copy_from_user(&pn, argp, sizeof(pn)))
  97                         return -EFAULT;
  98
  99                 pn = scif_bind(priv, pn);
 100                 if (pn < 0)
 101                         return pn;
 102
 103                 if (copy_to_user(argp, &pn, sizeof(pn)))
 104                         return -EFAULT;
 105
 106                 return 0;
 107         }
 108         case SCIF_LISTEN:
 109                 return scif_listen(priv, arg);
 110         case SCIF_CONNECT:
 111         {
 112                 struct scifioctl_connect req;
 113                 struct scif_endpt *ep = (struct scif_endpt *)priv;
 114
 115                 if (copy_from_user(&req, argp, sizeof(req)))
 116                         return -EFAULT;
 117
 118                 err = __scif_connect(priv, &req.peer, non_block);
 119                 if (err < 0)
 120                         return err;
 121
 122                 req.self.node = ep->port.node;
 123                 req.self.port = ep->port.port;
 124
 125                 if (copy_to_user(argp, &req, sizeof(req)))
 126                         return -EFAULT;
 127
 128                 return 0;
 129         }
 130         /*
 131          * Accept is done in two halves.  The request ioctl does the basic
 132          * functionality of accepting the request and returning the information
 133          * about it including the internal ID of the end point.  The register
 134          * is done with the internal ID on a new file descriptor opened by the
 135          * requesting process.
 136          */
 137         case SCIF_ACCEPTREQ:
 138         {
 139                 struct scifioctl_accept request;
 140                 scif_epd_t *ep = (scif_epd_t *)&request.endpt;
 141
 142                 if (copy_from_user(&request, argp, sizeof(request)))
 143                         return -EFAULT;
 144
 145                 err = scif_accept(priv, &request.peer, ep, request.flags);
 146                 if (err < 0)
 147                         return err;
 148
 149                 if (copy_to_user(argp, &request, sizeof(request))) {
 150                         scif_close(*ep);
 151                         return -EFAULT;
 152                 }
 153                 /*
 154                  * Add to the list of user mode eps where the second half
 155                  * of the accept is not yet completed.
 156                  */
 157                 mutex_lock(&scif_info.eplock);
 158                 list_add_tail(&((*ep)->miacceptlist), &scif_info.uaccept);
 159                 list_add_tail(&((*ep)->liacceptlist), &priv->li_accept);
 160                 (*ep)->listenep = priv;
 161                 priv->acceptcnt++;
 162                 mutex_unlock(&scif_info.eplock);
 163
 164                 return 0;
 165         }
 166         case SCIF_ACCEPTREG:
 167         {
 168                 struct scif_endpt *priv = f->private_data;
 169                 struct scif_endpt *newep;
 170                 struct scif_endpt *lisep;
 171                 struct scif_endpt *fep = NULL;
 172                 struct scif_endpt *tmpep;
 173                 struct list_head *pos, *tmpq;
 174
 175                 /* Finally replace the pointer to the accepted endpoint */
 176                 if (copy_from_user(&newep, argp, sizeof(void *)))
 177                         return -EFAULT;
 178
 179                 /* Remove form the user accept queue */
 180                 mutex_lock(&scif_info.eplock);
 181                 list_for_each_safe(pos, tmpq, &scif_info.uaccept) {
 182                         tmpep = list_entry(pos,
 183                                            struct scif_endpt, miacceptlist);
 184                         if (tmpep == newep) {
 185                                 list_del(pos);
 186                                 fep = tmpep;
 187                                 break;
 188                         }
 189                 }
 190
 191                 if (!fep) {
 192                         mutex_unlock(&scif_info.eplock);
 193                         return -ENOENT;
 194                 }
 195
 196                 lisep = newep->listenep;
 197                 list_for_each_safe(pos, tmpq, &lisep->li_accept) {
 198                         tmpep = list_entry(pos,
 199                                            struct scif_endpt, liacceptlist);
 200                         if (tmpep == newep) {
 201                                 list_del(pos);
 202                                 lisep->acceptcnt--;
 203                                 break;
 204                         }
 205                 }
 206
 207                 mutex_unlock(&scif_info.eplock);
 208
 209                 /* Free the resources automatically created from the open. */
 210                 scif_anon_inode_fput(priv);
 211                 scif_teardown_ep(priv);
 212                 scif_add_epd_to_zombie_list(priv, !SCIF_EPLOCK_HELD);
 213                 f->private_data = newep;
 214                 return 0;
 215         }
 216         case SCIF_SEND:
 217         {
 218                 struct scif_endpt *priv = f->private_data;
 219
 220                 if (copy_from_user(&request, argp,
 221                                    sizeof(struct scifioctl_msg))) {
 222                         err = -EFAULT;
 223                         goto send_err;
 224                 }
 225                 err = scif_user_send(priv, (void __user *)request.msg,
 226                                      request.len, request.flags);
 227                 if (err < 0)
 228                         goto send_err;
 229                 if (copy_to_user(&
 230                                  ((struct scifioctl_msg __user *)argp)->out_len,
 231                                  &err, sizeof(err))) {
 232                         err = -EFAULT;
 233                         goto send_err;
 234                 }
 235                 err = 0;
 236 send_err:
 237                 scif_err_debug(err, "scif_send");
 238                 return err;
 239         }
 240         case SCIF_RECV:
 241         {
 242                 struct scif_endpt *priv = f->private_data;
 243
 244                 if (copy_from_user(&request, argp,
 245                                    sizeof(struct scifioctl_msg))) {
 246                         err = -EFAULT;
 247                         goto recv_err;
 248                 }
 249
 250                 err = scif_user_recv(priv, (void __user *)request.msg,
 251                                      request.len, request.flags);
 252                 if (err < 0)
 253                         goto recv_err;
 254
 255                 if (copy_to_user(&
 256                                  ((struct scifioctl_msg __user *)argp)->out_len,
 257                         &err, sizeof(err))) {
 258                         err = -EFAULT;
 259                         goto recv_err;
 260                 }
 261                 err = 0;
 262 recv_err:
 263                 scif_err_debug(err, "scif_recv");
 264                 return err;
 265         }
 266         case SCIF_GET_NODEIDS:
 267         {
 268                 struct scifioctl_node_ids node_ids;
 269                 int entries;
 270                 u16 *nodes;
 271                 void __user *unodes, *uself;
 272                 u16 self;
 273
 274                 if (copy_from_user(&node_ids, argp, sizeof(node_ids))) {
 275                         err = -EFAULT;
 276                         goto getnodes_err2;
 277                 }
 278
 279                 entries = min_t(int, scif_info.maxid, node_ids.len);
 280                 nodes = kmalloc_array(entries, sizeof(u16), GFP_KERNEL);
 281                 if (entries && !nodes) {
 282                         err = -ENOMEM;
 283                         goto getnodes_err2;
 284                 }
 285                 node_ids.len = scif_get_node_ids(nodes, entries, &self);
 286
 287                 unodes = (void __user *)node_ids.nodes;
 288                 if (copy_to_user(unodes, nodes, sizeof(u16) * entries)) {
 289                         err = -EFAULT;
 290                         goto getnodes_err1;
 291                 }
 292
 293                 uself = (void __user *)node_ids.self;
 294                 if (copy_to_user(uself, &self, sizeof(u16))) {
 295                         err = -EFAULT;
 296                         goto getnodes_err1;
 297                 }
 298
 299                 if (copy_to_user(argp, &node_ids, sizeof(node_ids))) {
 300                         err = -EFAULT;
 301                         goto getnodes_err1;
 302                 }
 303 getnodes_err1:
 304                 kfree(nodes);
 305 getnodes_err2:
 306                 return err;
 307         }
 308         case SCIF_REG:
 309         {
 310                 struct scif_endpt *priv = f->private_data;
 311                 struct scifioctl_reg reg;
 312                 off_t ret;
 313
 314                 if (copy_from_user(&reg, argp, sizeof(reg))) {
 315                         err = -EFAULT;
 316                         goto reg_err;
 317                 }
 318                 if (reg.flags & SCIF_MAP_KERNEL) {
 319                         err = -EINVAL;
 320                         goto reg_err;
 321                 }
 322                 ret = scif_register(priv, (void *)reg.addr, reg.len,
 323                                     reg.offset, reg.prot, reg.flags);
 324                 if (ret < 0) {
 325                         err = (int)ret;
 326                         goto reg_err;
 327                 }
 328
 329                 if (copy_to_user(&((struct scifioctl_reg __user *)argp)
 330                                  ->out_offset, &ret, sizeof(reg.out_offset))) {
 331                         err = -EFAULT;
 332                         goto reg_err;
 333                 }
 334                 err = 0;
 335 reg_err:
 336                 scif_err_debug(err, "scif_register");
 337                 return err;
 338         }
 339         case SCIF_UNREG:
 340         {
 341                 struct scif_endpt *priv = f->private_data;
 342                 struct scifioctl_unreg unreg;
 343
 344                 if (copy_from_user(&unreg, argp, sizeof(unreg))) {
 345                         err = -EFAULT;
 346                         goto unreg_err;
 347                 }
 348                 err = scif_unregister(priv, unreg.offset, unreg.len);
 349 unreg_err:
 350                 scif_err_debug(err, "scif_unregister");
 351                 return err;
 352         }
 353         case SCIF_READFROM:
 354         {
 355                 struct scif_endpt *priv = f->private_data;
 356                 struct scifioctl_copy copy;
 357
 358                 if (copy_from_user(&copy, argp, sizeof(copy))) {
 359                         err = -EFAULT;
 360                         goto readfrom_err;
 361                 }
 362                 err = scif_readfrom(priv, copy.loffset, copy.len, copy.roffset,
 363                                     copy.flags);
 364 readfrom_err:
 365                 scif_err_debug(err, "scif_readfrom");
 366                 return err;
 367         }
 368         case SCIF_WRITETO:
 369         {
 370                 struct scif_endpt *priv = f->private_data;
 371                 struct scifioctl_copy copy;
 372
 373                 if (copy_from_user(&copy, argp, sizeof(copy))) {
 374                         err = -EFAULT;
 375                         goto writeto_err;
 376                 }
 377                 err = scif_writeto(priv, copy.loffset, copy.len, copy.roffset,
 378                                    copy.flags);
 379 writeto_err:
 380                 scif_err_debug(err, "scif_writeto");
 381                 return err;
 382         }
 383         case SCIF_VREADFROM:
 384         {
 385                 struct scif_endpt *priv = f->private_data;
 386                 struct scifioctl_copy copy;
 387
 388                 if (copy_from_user(&copy, argp, sizeof(copy))) {
 389                         err = -EFAULT;
 390                         goto vreadfrom_err;
 391                 }
 392                 err = scif_vreadfrom(priv, (void __force *)copy.addr, copy.len,
 393                                      copy.roffset, copy.flags);
 394 vreadfrom_err:
 395                 scif_err_debug(err, "scif_vreadfrom");
 396                 return err;
 397         }
 398         case SCIF_VWRITETO:
 399         {
 400                 struct scif_endpt *priv = f->private_data;
 401                 struct scifioctl_copy copy;
 402
 403                 if (copy_from_user(&copy, argp, sizeof(copy))) {
 404                         err = -EFAULT;
 405                         goto vwriteto_err;
 406                 }
 407                 err = scif_vwriteto(priv, (void __force *)copy.addr, copy.len,
 408                                     copy.roffset, copy.flags);
 409 vwriteto_err:
 410                 scif_err_debug(err, "scif_vwriteto");
 411                 return err;
 412         }
 413         case SCIF_FENCE_MARK:
 414         {
 415                 struct scif_endpt *priv = f->private_data;
 416                 struct scifioctl_fence_mark mark;
 417                 int tmp_mark = 0;
 418
 419                 if (copy_from_user(&mark, argp, sizeof(mark))) {
 420                         err = -EFAULT;
 421                         goto fence_mark_err;
 422                 }
 423                 err = scif_fence_mark(priv, mark.flags, &tmp_mark);
 424                 if (err)
 425                         goto fence_mark_err;
 426                 if (copy_to_user((void __user *)mark.mark, &tmp_mark,
 427                                  sizeof(tmp_mark))) {
 428                         err = -EFAULT;
 429                         goto fence_mark_err;
 430                 }
 431 fence_mark_err:
 432                 scif_err_debug(err, "scif_fence_mark");
 433                 return err;
 434         }
 435         case SCIF_FENCE_WAIT:
 436         {
 437                 struct scif_endpt *priv = f->private_data;
 438
 439                 err = scif_fence_wait(priv, arg);
 440                 scif_err_debug(err, "scif_fence_wait");
 441                 return err;
 442         }
 443         case SCIF_FENCE_SIGNAL:
 444         {
 445                 struct scif_endpt *priv = f->private_data;
 446                 struct scifioctl_fence_signal signal;
 447
 448                 if (copy_from_user(&signal, argp, sizeof(signal))) {
 449                         err = -EFAULT;
 450                         goto fence_signal_err;
 451                 }
 452
 453                 err = scif_fence_signal(priv, signal.loff, signal.lval,
 454                                         signal.roff, signal.rval, signal.flags);
 455 fence_signal_err:
 456                 scif_err_debug(err, "scif_fence_signal");
 457                 return err;
 458         }
 459         }
 460         return -EINVAL;
 461 }
 462
 463 const struct file_operations scif_fops = {
 464         .open = scif_fdopen,
 465         .release = scif_fdclose,
 466         .unlocked_ioctl = scif_fdioctl,
 467         .mmap = scif_fdmmap,
 468         .poll = scif_fdpoll,
 469         .flush = scif_fdflush,
 470         .owner = THIS_MODULE,
 471 };