| 1 | /* |
| 2 | * Copyright 2010-2017 Intel Corporation. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * Disclaimer: The codes contained in these modules may be specific to |
| 14 | * the Intel Software Development Platform codenamed Knights Ferry, |
| 15 | * and the Intel product codenamed Knights Corner, and are not backward |
| 16 | * compatible with other Intel products. Additionally, Intel will NOT |
| 17 | * support the codes or instruction set in future products. |
| 18 | * |
| 19 | * Intel offers no warranty of any kind regarding the code. This code is |
| 20 | * licensed on an "AS IS" basis and Intel is not obligated to provide |
| 21 | * any support, assistance, installation, training, or other services |
| 22 | * of any kind. Intel is also not obligated to provide any updates, |
| 23 | * enhancements or extensions. Intel specifically disclaims any warranty |
| 24 | * of merchantability, non-infringement, fitness for any particular |
| 25 | * purpose, and any other warranty. |
| 26 | * |
| 27 | * Further, Intel disclaims all liability of any kind, including but |
| 28 | * not limited to liability for infringement of any proprietary rights, |
| 29 | * relating to the use of the code, even if Intel is notified of the |
| 30 | * possibility of such liability. Except as expressly stated in an Intel |
| 31 | * license agreement provided with this code and agreed upon with Intel, |
| 32 | * no license, express or implied, by estoppel or otherwise, to any |
| 33 | * intellectual property rights is granted herein. |
| 34 | */ |
| 35 | |
| 36 | #include "mic/micscif.h" |
| 37 | |
| 38 | struct mic_priv { |
| 39 | scif_epd_t epd; |
| 40 | }; |
| 41 | |
| 42 | |
| 43 | int |
| 44 | scif_fdopen(struct file *f) |
| 45 | { |
| 46 | struct mic_priv *priv = (struct mic_priv *) |
| 47 | kmalloc(sizeof(struct mic_priv), GFP_KERNEL); |
| 48 | /* |
| 49 | * Not a valid errno as defined in scif.h but should be? |
| 50 | */ |
| 51 | if (!priv) |
| 52 | return -ENOMEM; |
| 53 | |
| 54 | /* SCIF device */ |
| 55 | if (!(priv->epd = __scif_open())) { |
| 56 | kfree(priv); |
| 57 | return -ENOMEM; |
| 58 | } |
| 59 | |
| 60 | ((f)->private_data) = priv; |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | int |
| 65 | scif_fdclose(struct file *f) |
| 66 | { |
| 67 | struct mic_priv *priv = ((f)->private_data); |
| 68 | int err = 0; |
| 69 | |
| 70 | /* Only actually request of tear down of end point if file reference |
| 71 | * count is greater than 1. This accounts for the fork() issue. |
| 72 | */ |
| 73 | if (atomic64_read(&f->f_count) == 0) { |
| 74 | err = __scif_close(priv->epd); |
| 75 | kfree(priv); |
| 76 | } |
| 77 | return err; |
| 78 | } |
| 79 | |
| 80 | int |
| 81 | micscif_mmap(struct file *f, struct vm_area_struct *vma) |
| 82 | { |
| 83 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 84 | return scif_mmap(vma, priv->epd); |
| 85 | } |
| 86 | |
| 87 | unsigned int |
| 88 | micscif_poll(struct file *f, poll_table *wait) |
| 89 | { |
| 90 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 91 | return __scif_pollfd(f, wait, (struct endpt *)priv->epd); |
| 92 | } |
| 93 | |
| 94 | int |
| 95 | micscif_flush(struct file *f, fl_owner_t id) |
| 96 | { |
| 97 | struct mic_priv *priv; |
| 98 | dev_t dev; |
| 99 | struct endpt *ep; |
| 100 | |
| 101 | priv = (struct mic_priv *)f->private_data; |
| 102 | dev = f->f_path.dentry->d_inode->i_rdev; |
| 103 | if (MINOR(dev) != 1) // SCIF MINOR |
| 104 | return 0; |
| 105 | |
| 106 | ep = priv->epd; |
| 107 | |
| 108 | /* Handles fork issue, making suer an endpoint only closes when the original |
| 109 | * thread that created it tries to close it, or when there are no more |
| 110 | * references to it. |
| 111 | */ |
| 112 | if (ep->files == id) |
| 113 | __scif_flush(ep); |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | |
| 119 | static __always_inline void |
| 120 | scif_err_debug(int err, const char *str) |
| 121 | { |
| 122 | /* |
| 123 | * ENOTCONN is a common uninteresting error which is |
| 124 | * flooding debug messages to the console unnecessarily. |
| 125 | */ |
| 126 | if (err < 0 && err != -ENOTCONN) |
| 127 | pr_debug("%s err %d\n", str, err); |
| 128 | } |
| 129 | |
| 130 | |
| 131 | |
| 132 | int |
| 133 | scif_process_ioctl(struct file *f, unsigned int cmd, uint64_t arg) |
| 134 | { |
| 135 | struct mic_priv *priv = ((f)->private_data); |
| 136 | void __user *argp = (void __user *)arg; |
| 137 | int err = 0; |
| 138 | struct scifioctl_msg request; |
| 139 | bool non_block = false; |
| 140 | |
| 141 | non_block = !!(f->f_flags & O_NONBLOCK); |
| 142 | |
| 143 | switch (cmd) { |
| 144 | case SCIF_BIND: |
| 145 | { |
| 146 | int pn; |
| 147 | |
| 148 | if (copy_from_user(&pn, argp, sizeof(pn))) { |
| 149 | return -EFAULT; |
| 150 | } |
| 151 | |
| 152 | if ((pn = __scif_bind(priv->epd, pn)) < 0) { |
| 153 | return pn; |
| 154 | } |
| 155 | |
| 156 | if (copy_to_user(argp, &pn, sizeof(pn))) { |
| 157 | return -EFAULT; |
| 158 | } |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | case SCIF_LISTEN: |
| 163 | return __scif_listen(priv->epd, arg); |
| 164 | case SCIF_CONNECT: |
| 165 | { |
| 166 | struct scifioctl_connect req; |
| 167 | struct endpt *ep = (struct endpt *)priv->epd; |
| 168 | |
| 169 | if (copy_from_user(&req, argp, sizeof(struct scifioctl_connect))) { |
| 170 | return -EFAULT; |
| 171 | } |
| 172 | |
| 173 | if ((err = __scif_connect(priv->epd, &req.peer, non_block)) < 0) { |
| 174 | return err; |
| 175 | } |
| 176 | |
| 177 | req.self.node = ep->port.node; |
| 178 | req.self.port = ep->port.port; |
| 179 | |
| 180 | if (copy_to_user(argp, &req, sizeof(struct scifioctl_connect))) { |
| 181 | return -EFAULT; |
| 182 | } |
| 183 | |
| 184 | |
| 185 | return 0; |
| 186 | } |
| 187 | // Accept is done in two halves. Thes request ioctl does the basic functility of accepting |
| 188 | // the request and returning the information about it including the internal ID of the |
| 189 | // end point. The register is done with the internID on a new file desciptor opened by the |
| 190 | // requesting process. |
| 191 | case SCIF_ACCEPTREQ: |
| 192 | { |
| 193 | struct scifioctl_accept request; |
| 194 | unsigned long sflags; |
| 195 | scif_epd_t *ep = (scif_epd_t *)&request.endpt; |
| 196 | |
| 197 | if (copy_from_user(&request, argp, sizeof(struct scifioctl_accept))) { |
| 198 | return -EFAULT; |
| 199 | } |
| 200 | |
| 201 | if ((err = __scif_accept(priv->epd, &request.peer, ep, request.flags)) < 0) { |
| 202 | return err; |
| 203 | } |
| 204 | |
| 205 | if (copy_to_user(argp, &request, sizeof(struct scifioctl_accept))) { |
| 206 | scif_close(*ep); |
| 207 | return -EFAULT; |
| 208 | } |
| 209 | |
| 210 | // Add to the list of user mode eps where the second half of the accept |
| 211 | // is not yet completed. |
| 212 | spin_lock_irqsave(&ms_info.mi_eplock, sflags); |
| 213 | list_add_tail(&((*ep)->miacceptlist), &ms_info.mi_uaccept); |
| 214 | list_add_tail(&((*ep)->liacceptlist), &priv->epd->li_accept); |
| 215 | (*ep)->listenep = priv->epd; |
| 216 | priv->epd->acceptcnt++; |
| 217 | spin_unlock_irqrestore(&ms_info.mi_eplock, sflags); |
| 218 | |
| 219 | return 0; |
| 220 | } |
| 221 | case SCIF_ACCEPTREG: |
| 222 | { |
| 223 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 224 | struct endpt *newep; |
| 225 | struct endpt *lisep; |
| 226 | struct endpt *ep; |
| 227 | struct endpt *fep = NULL; |
| 228 | struct endpt *tmpep; |
| 229 | struct list_head *pos, *tmpq; |
| 230 | unsigned long sflags; |
| 231 | |
| 232 | // Finally replace the pointer to the accepted endpoint |
| 233 | if (copy_from_user(&newep, argp, sizeof(void *))) |
| 234 | return -EFAULT; |
| 235 | |
| 236 | // Remove form the user accept queue |
| 237 | spin_lock_irqsave(&ms_info.mi_eplock, sflags); |
| 238 | list_for_each_safe(pos, tmpq, &ms_info.mi_uaccept) { |
| 239 | tmpep = list_entry(pos, struct endpt, miacceptlist); |
| 240 | if (tmpep == newep) { |
| 241 | list_del(pos); |
| 242 | fep = tmpep; |
| 243 | break; |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | if (fep == NULL) { |
| 248 | spin_unlock_irqrestore(&ms_info.mi_eplock, sflags); |
| 249 | return -ENOENT; |
| 250 | } |
| 251 | |
| 252 | lisep = newep->listenep; |
| 253 | list_for_each_safe(pos, tmpq, &lisep->li_accept) { |
| 254 | tmpep = list_entry(pos, struct endpt, liacceptlist); |
| 255 | if (tmpep == newep) { |
| 256 | list_del(pos); |
| 257 | lisep->acceptcnt--; |
| 258 | break; |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | spin_unlock_irqrestore(&ms_info.mi_eplock, sflags); |
| 263 | |
| 264 | // Free the resources automatically created from the open. |
| 265 | micscif_teardown_ep(priv->epd); |
| 266 | micscif_add_epd_to_zombie_list(priv->epd, !MI_EPLOCK_HELD); |
| 267 | priv->epd = newep; |
| 268 | ep = (struct endpt *)priv->epd; |
| 269 | ep = ep; |
| 270 | return 0; |
| 271 | } |
| 272 | case SCIF_SEND: |
| 273 | { |
| 274 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 275 | |
| 276 | if (copy_from_user(&request, argp, |
| 277 | sizeof(struct scifioctl_msg))) { |
| 278 | err = -EFAULT; |
| 279 | goto send_err; |
| 280 | } |
| 281 | |
| 282 | if ((err = scif_user_send(priv->epd, request.msg, |
| 283 | request.len, request.flags)) < 0) |
| 284 | goto send_err; |
| 285 | |
| 286 | if (copy_to_user(&((struct scifioctl_msg*)argp)->out_len, |
| 287 | &err, sizeof(err))) { |
| 288 | err = -EFAULT; |
| 289 | goto send_err; |
| 290 | } |
| 291 | err = 0; |
| 292 | send_err: |
| 293 | scif_err_debug(err, "scif_send"); |
| 294 | return err; |
| 295 | } |
| 296 | case SCIF_RECV: |
| 297 | { |
| 298 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 299 | |
| 300 | if (copy_from_user(&request, argp, |
| 301 | sizeof(struct scifioctl_msg))) { |
| 302 | err = -EFAULT; |
| 303 | goto recv_err; |
| 304 | } |
| 305 | |
| 306 | if ((err = scif_user_recv(priv->epd, request.msg, |
| 307 | request.len, request.flags)) < 0) |
| 308 | goto recv_err; |
| 309 | |
| 310 | if (copy_to_user(&((struct scifioctl_msg*)argp)->out_len, |
| 311 | &err, sizeof(err))) { |
| 312 | err = -EFAULT; |
| 313 | goto recv_err; |
| 314 | } |
| 315 | err = 0; |
| 316 | recv_err: |
| 317 | scif_err_debug(err, "scif_recv"); |
| 318 | return err; |
| 319 | } |
| 320 | case SCIF_REG: |
| 321 | { |
| 322 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 323 | struct scifioctl_reg reg; |
| 324 | off_t ret; |
| 325 | |
| 326 | if (copy_from_user(®, argp, sizeof(reg))) { |
| 327 | err = -EFAULT; |
| 328 | goto reg_err; |
| 329 | } |
| 330 | if (reg.flags & SCIF_MAP_KERNEL) { |
| 331 | err = -EINVAL; |
| 332 | goto reg_err; |
| 333 | } |
| 334 | if ((ret = __scif_register(priv->epd, reg.addr, reg.len, |
| 335 | reg.offset, reg.prot, reg.flags)) < 0) { |
| 336 | err = (int)ret; |
| 337 | goto reg_err; |
| 338 | } |
| 339 | |
| 340 | if (copy_to_user(&((struct scifioctl_reg*)argp)->out_offset, |
| 341 | &ret, sizeof(reg.out_offset))) { |
| 342 | err = -EFAULT; |
| 343 | goto reg_err; |
| 344 | } |
| 345 | err = 0; |
| 346 | reg_err: |
| 347 | scif_err_debug(err, "scif_register"); |
| 348 | return err; |
| 349 | } |
| 350 | case SCIF_UNREG: |
| 351 | { |
| 352 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 353 | struct scifioctl_unreg unreg; |
| 354 | |
| 355 | if (copy_from_user(&unreg, argp, sizeof(unreg))) { |
| 356 | err = -EFAULT; |
| 357 | goto unreg_err; |
| 358 | } |
| 359 | err = __scif_unregister(priv->epd, unreg.offset, unreg.len); |
| 360 | unreg_err: |
| 361 | scif_err_debug(err, "scif_unregister"); |
| 362 | return err; |
| 363 | } |
| 364 | case SCIF_READFROM: |
| 365 | { |
| 366 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 367 | struct scifioctl_copy copy; |
| 368 | |
| 369 | if (copy_from_user(©, argp, sizeof(copy))) { |
| 370 | err = -EFAULT; |
| 371 | goto readfrom_err; |
| 372 | } |
| 373 | err = __scif_readfrom(priv->epd, |
| 374 | copy.loffset, |
| 375 | copy.len, |
| 376 | copy.roffset, |
| 377 | copy.flags); |
| 378 | readfrom_err: |
| 379 | scif_err_debug(err, "scif_readfrom"); |
| 380 | return err; |
| 381 | } |
| 382 | case SCIF_WRITETO: |
| 383 | { |
| 384 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 385 | struct scifioctl_copy copy; |
| 386 | |
| 387 | if (copy_from_user(©, argp, sizeof(copy))) { |
| 388 | err = -EFAULT; |
| 389 | goto writeto_err; |
| 390 | } |
| 391 | err = __scif_writeto(priv->epd, |
| 392 | copy.loffset, |
| 393 | copy.len, |
| 394 | copy.roffset, |
| 395 | copy.flags); |
| 396 | writeto_err: |
| 397 | scif_err_debug(err, "scif_writeto"); |
| 398 | return err; |
| 399 | } |
| 400 | case SCIF_VREADFROM: |
| 401 | { |
| 402 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 403 | struct scifioctl_copy copy; |
| 404 | |
| 405 | if (copy_from_user(©, argp, sizeof(copy))) { |
| 406 | err = -EFAULT; |
| 407 | goto vreadfrom_err; |
| 408 | } |
| 409 | err = __scif_vreadfrom(priv->epd, |
| 410 | copy.addr, |
| 411 | copy.len, |
| 412 | copy.roffset, |
| 413 | copy.flags); |
| 414 | vreadfrom_err: |
| 415 | scif_err_debug(err, "scif_vreadfrom"); |
| 416 | return err; |
| 417 | } |
| 418 | case SCIF_VWRITETO: |
| 419 | { |
| 420 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 421 | struct scifioctl_copy copy; |
| 422 | |
| 423 | if (copy_from_user(©, argp, sizeof(copy))) { |
| 424 | err = -EFAULT; |
| 425 | goto vwriteto_err; |
| 426 | } |
| 427 | err = __scif_vwriteto(priv->epd, |
| 428 | copy.addr, |
| 429 | copy.len, |
| 430 | copy.roffset, |
| 431 | copy.flags); |
| 432 | vwriteto_err: |
| 433 | scif_err_debug(err, "scif_vwriteto"); |
| 434 | return err; |
| 435 | } |
| 436 | case SCIF_GET_NODEIDS: |
| 437 | { |
| 438 | struct scifioctl_nodeIDs nodeIDs; |
| 439 | int entries; |
| 440 | uint16_t *nodes; |
| 441 | uint16_t self; |
| 442 | |
| 443 | if (copy_from_user(&nodeIDs, argp, sizeof(nodeIDs))) { |
| 444 | err = -EFAULT; |
| 445 | goto getnodes_err2; |
| 446 | } |
| 447 | |
| 448 | entries = SCIF_MIN(MAX_BOARD_SUPPORTED, nodeIDs.len); |
| 449 | |
| 450 | nodes = kmalloc(sizeof(uint16_t) * entries, GFP_KERNEL); |
| 451 | if ( (entries != 0) && (!nodes) ){ |
| 452 | err = -ENOMEM; |
| 453 | goto getnodes_err2; |
| 454 | } |
| 455 | nodeIDs.len = scif_get_nodeIDs(nodes, entries, &self); |
| 456 | |
| 457 | if (copy_to_user(nodeIDs.nodes, |
| 458 | nodes, sizeof(uint16_t) * entries)) { |
| 459 | err = -EFAULT; |
| 460 | goto getnodes_err1; |
| 461 | } |
| 462 | |
| 463 | if (copy_to_user(nodeIDs.self, |
| 464 | &self, sizeof(uint16_t))) { |
| 465 | err = -EFAULT; |
| 466 | goto getnodes_err1; |
| 467 | } |
| 468 | |
| 469 | if (copy_to_user(argp, &nodeIDs, sizeof(nodeIDs))) { |
| 470 | err = -EFAULT; |
| 471 | goto getnodes_err1; |
| 472 | } |
| 473 | getnodes_err1: |
| 474 | kfree(nodes); |
| 475 | getnodes_err2: |
| 476 | return err; |
| 477 | } |
| 478 | case SCIF_FENCE_MARK: |
| 479 | { |
| 480 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 481 | struct scifioctl_fence_mark mark; |
| 482 | int tmp_mark = 0; |
| 483 | |
| 484 | if (copy_from_user(&mark, argp, sizeof(mark))) { |
| 485 | err = -EFAULT; |
| 486 | goto fence_mark_err; |
| 487 | } |
| 488 | if ((err = __scif_fence_mark(priv->epd, |
| 489 | mark.flags, &tmp_mark))) |
| 490 | goto fence_mark_err; |
| 491 | if (copy_to_user(mark.mark, &tmp_mark, sizeof(tmp_mark))) { |
| 492 | err = -EFAULT; |
| 493 | goto fence_mark_err; |
| 494 | } |
| 495 | fence_mark_err: |
| 496 | scif_err_debug(err, "scif_fence_mark"); |
| 497 | return err; |
| 498 | } |
| 499 | case SCIF_FENCE_WAIT: |
| 500 | { |
| 501 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 502 | err = __scif_fence_wait(priv->epd, arg); |
| 503 | scif_err_debug(err, "scif_fence_wait"); |
| 504 | return err; |
| 505 | } |
| 506 | case SCIF_FENCE_SIGNAL: |
| 507 | { |
| 508 | struct mic_priv *priv = (struct mic_priv *)((f)->private_data); |
| 509 | struct scifioctl_fence_signal signal; |
| 510 | |
| 511 | if (copy_from_user(&signal, argp, sizeof(signal))) { |
| 512 | err = -EFAULT; |
| 513 | goto fence_signal_err; |
| 514 | } |
| 515 | |
| 516 | err = __scif_fence_signal(priv->epd, signal.loff, |
| 517 | signal.lval, signal.roff, signal.rval, signal.flags); |
| 518 | fence_signal_err: |
| 519 | scif_err_debug(err, "scif_fence_signal"); |
| 520 | return err; |
| 521 | } |
| 522 | case SCIF_GET_VERSION: |
| 523 | { |
| 524 | return SCIF_VERSION; |
| 525 | } |
| 526 | } |
| 527 | return -EINVAL; |
| 528 | } |