Sudeep Dutt | ba612aa | 2015-09-29 18:15:29 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Intel MIC Platform Software Stack (MPSS) |
| 3 | * |
| 4 | * Copyright(c) 2015 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 <linux/dma_remapping.h> |
| 19 | #include <linux/pagemap.h> |
| 20 | #include "scif_main.h" |
| 21 | #include "scif_map.h" |
| 22 | |
| 23 | /* Used to skip ulimit checks for registrations with SCIF_MAP_KERNEL flag */ |
| 24 | #define SCIF_MAP_ULIMIT 0x40 |
| 25 | |
| 26 | bool scif_ulimit_check = 1; |
| 27 | |
| 28 | /** |
| 29 | * scif_rma_ep_init: |
| 30 | * @ep: end point |
| 31 | * |
| 32 | * Initialize RMA per EP data structures. |
| 33 | */ |
| 34 | void scif_rma_ep_init(struct scif_endpt *ep) |
| 35 | { |
| 36 | struct scif_endpt_rma_info *rma = &ep->rma_info; |
| 37 | |
| 38 | mutex_init(&rma->rma_lock); |
| 39 | init_iova_domain(&rma->iovad, PAGE_SIZE, SCIF_IOVA_START_PFN, |
| 40 | SCIF_DMA_64BIT_PFN); |
| 41 | spin_lock_init(&rma->tc_lock); |
| 42 | mutex_init(&rma->mmn_lock); |
| 43 | INIT_LIST_HEAD(&rma->reg_list); |
| 44 | INIT_LIST_HEAD(&rma->remote_reg_list); |
| 45 | atomic_set(&rma->tw_refcount, 0); |
| 46 | atomic_set(&rma->tcw_refcount, 0); |
| 47 | atomic_set(&rma->tcw_total_pages, 0); |
| 48 | atomic_set(&rma->fence_refcount, 0); |
| 49 | |
| 50 | rma->async_list_del = 0; |
| 51 | rma->dma_chan = NULL; |
| 52 | INIT_LIST_HEAD(&rma->mmn_list); |
| 53 | INIT_LIST_HEAD(&rma->vma_list); |
| 54 | init_waitqueue_head(&rma->markwq); |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * scif_rma_ep_can_uninit: |
| 59 | * @ep: end point |
| 60 | * |
| 61 | * Returns 1 if an endpoint can be uninitialized and 0 otherwise. |
| 62 | */ |
| 63 | int scif_rma_ep_can_uninit(struct scif_endpt *ep) |
| 64 | { |
| 65 | int ret = 0; |
| 66 | |
| 67 | mutex_lock(&ep->rma_info.rma_lock); |
| 68 | /* Destroy RMA Info only if both lists are empty */ |
| 69 | if (list_empty(&ep->rma_info.reg_list) && |
| 70 | list_empty(&ep->rma_info.remote_reg_list) && |
| 71 | list_empty(&ep->rma_info.mmn_list) && |
| 72 | !atomic_read(&ep->rma_info.tw_refcount) && |
| 73 | !atomic_read(&ep->rma_info.tcw_refcount) && |
| 74 | !atomic_read(&ep->rma_info.fence_refcount)) |
| 75 | ret = 1; |
| 76 | mutex_unlock(&ep->rma_info.rma_lock); |
| 77 | return ret; |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * scif_create_pinned_pages: |
| 82 | * @nr_pages: number of pages in window |
| 83 | * @prot: read/write protection |
| 84 | * |
| 85 | * Allocate and prepare a set of pinned pages. |
| 86 | */ |
| 87 | static struct scif_pinned_pages * |
| 88 | scif_create_pinned_pages(int nr_pages, int prot) |
| 89 | { |
| 90 | struct scif_pinned_pages *pin; |
| 91 | |
| 92 | might_sleep(); |
| 93 | pin = scif_zalloc(sizeof(*pin)); |
| 94 | if (!pin) |
| 95 | goto error; |
| 96 | |
| 97 | pin->pages = scif_zalloc(nr_pages * sizeof(*pin->pages)); |
| 98 | if (!pin->pages) |
| 99 | goto error_free_pinned_pages; |
| 100 | |
| 101 | pin->prot = prot; |
| 102 | pin->magic = SCIFEP_MAGIC; |
| 103 | return pin; |
| 104 | |
| 105 | error_free_pinned_pages: |
| 106 | scif_free(pin, sizeof(*pin)); |
| 107 | error: |
| 108 | return NULL; |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * scif_destroy_pinned_pages: |
| 113 | * @pin: A set of pinned pages. |
| 114 | * |
| 115 | * Deallocate resources for pinned pages. |
| 116 | */ |
| 117 | static int scif_destroy_pinned_pages(struct scif_pinned_pages *pin) |
| 118 | { |
| 119 | int j; |
| 120 | int writeable = pin->prot & SCIF_PROT_WRITE; |
| 121 | int kernel = SCIF_MAP_KERNEL & pin->map_flags; |
| 122 | |
| 123 | for (j = 0; j < pin->nr_pages; j++) { |
| 124 | if (pin->pages[j] && !kernel) { |
| 125 | if (writeable) |
| 126 | SetPageDirty(pin->pages[j]); |
| 127 | put_page(pin->pages[j]); |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | scif_free(pin->pages, |
| 132 | pin->nr_pages * sizeof(*pin->pages)); |
| 133 | scif_free(pin, sizeof(*pin)); |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * scif_create_window: |
| 139 | * @ep: end point |
| 140 | * @nr_pages: number of pages |
| 141 | * @offset: registration offset |
| 142 | * @temp: true if a temporary window is being created |
| 143 | * |
| 144 | * Allocate and prepare a self registration window. |
| 145 | */ |
| 146 | struct scif_window *scif_create_window(struct scif_endpt *ep, int nr_pages, |
| 147 | s64 offset, bool temp) |
| 148 | { |
| 149 | struct scif_window *window; |
| 150 | |
| 151 | might_sleep(); |
| 152 | window = scif_zalloc(sizeof(*window)); |
| 153 | if (!window) |
| 154 | goto error; |
| 155 | |
| 156 | window->dma_addr = scif_zalloc(nr_pages * sizeof(*window->dma_addr)); |
| 157 | if (!window->dma_addr) |
| 158 | goto error_free_window; |
| 159 | |
| 160 | window->num_pages = scif_zalloc(nr_pages * sizeof(*window->num_pages)); |
| 161 | if (!window->num_pages) |
| 162 | goto error_free_window; |
| 163 | |
| 164 | window->offset = offset; |
| 165 | window->ep = (u64)ep; |
| 166 | window->magic = SCIFEP_MAGIC; |
| 167 | window->reg_state = OP_IDLE; |
| 168 | init_waitqueue_head(&window->regwq); |
| 169 | window->unreg_state = OP_IDLE; |
| 170 | init_waitqueue_head(&window->unregwq); |
| 171 | INIT_LIST_HEAD(&window->list); |
| 172 | window->type = SCIF_WINDOW_SELF; |
| 173 | window->temp = temp; |
| 174 | return window; |
| 175 | |
| 176 | error_free_window: |
| 177 | scif_free(window->dma_addr, |
| 178 | nr_pages * sizeof(*window->dma_addr)); |
| 179 | scif_free(window, sizeof(*window)); |
| 180 | error: |
| 181 | return NULL; |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * scif_destroy_incomplete_window: |
| 186 | * @ep: end point |
| 187 | * @window: registration window |
| 188 | * |
| 189 | * Deallocate resources for self window. |
| 190 | */ |
| 191 | static void scif_destroy_incomplete_window(struct scif_endpt *ep, |
| 192 | struct scif_window *window) |
| 193 | { |
| 194 | int err; |
| 195 | int nr_pages = window->nr_pages; |
| 196 | struct scif_allocmsg *alloc = &window->alloc_handle; |
| 197 | struct scifmsg msg; |
| 198 | |
| 199 | retry: |
| 200 | /* Wait for a SCIF_ALLOC_GNT/REJ message */ |
| 201 | err = wait_event_timeout(alloc->allocwq, |
| 202 | alloc->state != OP_IN_PROGRESS, |
| 203 | SCIF_NODE_ALIVE_TIMEOUT); |
| 204 | if (!err && scifdev_alive(ep)) |
| 205 | goto retry; |
| 206 | |
| 207 | mutex_lock(&ep->rma_info.rma_lock); |
| 208 | if (alloc->state == OP_COMPLETED) { |
| 209 | msg.uop = SCIF_FREE_VIRT; |
| 210 | msg.src = ep->port; |
| 211 | msg.payload[0] = ep->remote_ep; |
| 212 | msg.payload[1] = window->alloc_handle.vaddr; |
| 213 | msg.payload[2] = (u64)window; |
| 214 | msg.payload[3] = SCIF_REGISTER; |
| 215 | _scif_nodeqp_send(ep->remote_dev, &msg); |
| 216 | } |
| 217 | mutex_unlock(&ep->rma_info.rma_lock); |
| 218 | |
| 219 | scif_free_window_offset(ep, window, window->offset); |
| 220 | scif_free(window->dma_addr, nr_pages * sizeof(*window->dma_addr)); |
| 221 | scif_free(window->num_pages, nr_pages * sizeof(*window->num_pages)); |
| 222 | scif_free(window, sizeof(*window)); |
| 223 | } |
| 224 | |
| 225 | /** |
| 226 | * scif_unmap_window: |
| 227 | * @remote_dev: SCIF remote device |
| 228 | * @window: registration window |
| 229 | * |
| 230 | * Delete any DMA mappings created for a registered self window |
| 231 | */ |
| 232 | void scif_unmap_window(struct scif_dev *remote_dev, struct scif_window *window) |
| 233 | { |
| 234 | int j; |
| 235 | |
| 236 | if (scif_is_iommu_enabled() && !scifdev_self(remote_dev)) { |
| 237 | if (window->st) { |
| 238 | dma_unmap_sg(&remote_dev->sdev->dev, |
| 239 | window->st->sgl, window->st->nents, |
| 240 | DMA_BIDIRECTIONAL); |
| 241 | sg_free_table(window->st); |
| 242 | kfree(window->st); |
| 243 | window->st = NULL; |
| 244 | } |
| 245 | } else { |
| 246 | for (j = 0; j < window->nr_contig_chunks; j++) { |
| 247 | if (window->dma_addr[j]) { |
| 248 | scif_unmap_single(window->dma_addr[j], |
| 249 | remote_dev, |
| 250 | window->num_pages[j] << |
| 251 | PAGE_SHIFT); |
| 252 | window->dma_addr[j] = 0x0; |
| 253 | } |
| 254 | } |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | static inline struct mm_struct *__scif_acquire_mm(void) |
| 259 | { |
| 260 | if (scif_ulimit_check) |
| 261 | return get_task_mm(current); |
| 262 | return NULL; |
| 263 | } |
| 264 | |
| 265 | static inline void __scif_release_mm(struct mm_struct *mm) |
| 266 | { |
| 267 | if (mm) |
| 268 | mmput(mm); |
| 269 | } |
| 270 | |
| 271 | static inline int |
| 272 | __scif_dec_pinned_vm_lock(struct mm_struct *mm, |
| 273 | int nr_pages, bool try_lock) |
| 274 | { |
| 275 | if (!mm || !nr_pages || !scif_ulimit_check) |
| 276 | return 0; |
| 277 | if (try_lock) { |
| 278 | if (!down_write_trylock(&mm->mmap_sem)) { |
| 279 | dev_err(scif_info.mdev.this_device, |
| 280 | "%s %d err\n", __func__, __LINE__); |
| 281 | return -1; |
| 282 | } |
| 283 | } else { |
| 284 | down_write(&mm->mmap_sem); |
| 285 | } |
| 286 | mm->pinned_vm -= nr_pages; |
| 287 | up_write(&mm->mmap_sem); |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | static inline int __scif_check_inc_pinned_vm(struct mm_struct *mm, |
| 292 | int nr_pages) |
| 293 | { |
| 294 | unsigned long locked, lock_limit; |
| 295 | |
| 296 | if (!mm || !nr_pages || !scif_ulimit_check) |
| 297 | return 0; |
| 298 | |
| 299 | locked = nr_pages; |
| 300 | locked += mm->pinned_vm; |
| 301 | lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
| 302 | if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) { |
| 303 | dev_err(scif_info.mdev.this_device, |
| 304 | "locked(%lu) > lock_limit(%lu)\n", |
| 305 | locked, lock_limit); |
| 306 | return -ENOMEM; |
| 307 | } |
| 308 | mm->pinned_vm = locked; |
| 309 | return 0; |
| 310 | } |
| 311 | |
| 312 | /** |
| 313 | * scif_destroy_window: |
| 314 | * @ep: end point |
| 315 | * @window: registration window |
| 316 | * |
| 317 | * Deallocate resources for self window. |
| 318 | */ |
| 319 | int scif_destroy_window(struct scif_endpt *ep, struct scif_window *window) |
| 320 | { |
| 321 | int j; |
| 322 | struct scif_pinned_pages *pinned_pages = window->pinned_pages; |
| 323 | int nr_pages = window->nr_pages; |
| 324 | |
| 325 | might_sleep(); |
| 326 | if (!window->temp && window->mm) { |
| 327 | __scif_dec_pinned_vm_lock(window->mm, window->nr_pages, 0); |
| 328 | __scif_release_mm(window->mm); |
| 329 | window->mm = NULL; |
| 330 | } |
| 331 | |
| 332 | scif_free_window_offset(ep, window, window->offset); |
| 333 | scif_unmap_window(ep->remote_dev, window); |
| 334 | /* |
| 335 | * Decrement references for this set of pinned pages from |
| 336 | * this window. |
| 337 | */ |
| 338 | j = atomic_sub_return(1, &pinned_pages->ref_count); |
| 339 | if (j < 0) |
| 340 | dev_err(scif_info.mdev.this_device, |
| 341 | "%s %d incorrect ref count %d\n", |
| 342 | __func__, __LINE__, j); |
| 343 | /* |
| 344 | * If the ref count for pinned_pages is zero then someone |
| 345 | * has already called scif_unpin_pages() for it and we should |
| 346 | * destroy the page cache. |
| 347 | */ |
| 348 | if (!j) |
| 349 | scif_destroy_pinned_pages(window->pinned_pages); |
| 350 | scif_free(window->dma_addr, nr_pages * sizeof(*window->dma_addr)); |
| 351 | scif_free(window->num_pages, nr_pages * sizeof(*window->num_pages)); |
| 352 | window->magic = 0; |
| 353 | scif_free(window, sizeof(*window)); |
| 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | /** |
| 358 | * scif_create_remote_lookup: |
| 359 | * @remote_dev: SCIF remote device |
| 360 | * @window: remote window |
| 361 | * |
| 362 | * Allocate and prepare lookup entries for the remote |
| 363 | * end to copy over the physical addresses. |
| 364 | * Returns 0 on success and appropriate errno on failure. |
| 365 | */ |
| 366 | static int scif_create_remote_lookup(struct scif_dev *remote_dev, |
| 367 | struct scif_window *window) |
| 368 | { |
| 369 | int i, j, err = 0; |
| 370 | int nr_pages = window->nr_pages; |
| 371 | bool vmalloc_dma_phys, vmalloc_num_pages; |
| 372 | |
| 373 | might_sleep(); |
| 374 | /* Map window */ |
| 375 | err = scif_map_single(&window->mapped_offset, |
| 376 | window, remote_dev, sizeof(*window)); |
| 377 | if (err) |
| 378 | goto error_window; |
| 379 | |
| 380 | /* Compute the number of lookup entries. 21 == 2MB Shift */ |
| 381 | window->nr_lookup = ALIGN(nr_pages * PAGE_SIZE, |
| 382 | ((2) * 1024 * 1024)) >> 21; |
| 383 | |
| 384 | window->dma_addr_lookup.lookup = |
| 385 | scif_alloc_coherent(&window->dma_addr_lookup.offset, |
| 386 | remote_dev, window->nr_lookup * |
| 387 | sizeof(*window->dma_addr_lookup.lookup), |
| 388 | GFP_KERNEL | __GFP_ZERO); |
| 389 | if (!window->dma_addr_lookup.lookup) |
| 390 | goto error_window; |
| 391 | |
| 392 | window->num_pages_lookup.lookup = |
| 393 | scif_alloc_coherent(&window->num_pages_lookup.offset, |
| 394 | remote_dev, window->nr_lookup * |
| 395 | sizeof(*window->num_pages_lookup.lookup), |
| 396 | GFP_KERNEL | __GFP_ZERO); |
| 397 | if (!window->num_pages_lookup.lookup) |
| 398 | goto error_window; |
| 399 | |
| 400 | vmalloc_dma_phys = is_vmalloc_addr(&window->dma_addr[0]); |
| 401 | vmalloc_num_pages = is_vmalloc_addr(&window->num_pages[0]); |
| 402 | |
| 403 | /* Now map each of the pages containing physical addresses */ |
| 404 | for (i = 0, j = 0; i < nr_pages; i += SCIF_NR_ADDR_IN_PAGE, j++) { |
| 405 | err = scif_map_page(&window->dma_addr_lookup.lookup[j], |
| 406 | vmalloc_dma_phys ? |
| 407 | vmalloc_to_page(&window->dma_addr[i]) : |
| 408 | virt_to_page(&window->dma_addr[i]), |
| 409 | remote_dev); |
| 410 | if (err) |
| 411 | goto error_window; |
| 412 | err = scif_map_page(&window->num_pages_lookup.lookup[j], |
| 413 | vmalloc_dma_phys ? |
| 414 | vmalloc_to_page(&window->num_pages[i]) : |
| 415 | virt_to_page(&window->num_pages[i]), |
| 416 | remote_dev); |
| 417 | if (err) |
| 418 | goto error_window; |
| 419 | } |
| 420 | return 0; |
| 421 | error_window: |
| 422 | return err; |
| 423 | } |
| 424 | |
| 425 | /** |
| 426 | * scif_destroy_remote_lookup: |
| 427 | * @remote_dev: SCIF remote device |
| 428 | * @window: remote window |
| 429 | * |
| 430 | * Destroy lookup entries used for the remote |
| 431 | * end to copy over the physical addresses. |
| 432 | */ |
| 433 | static void scif_destroy_remote_lookup(struct scif_dev *remote_dev, |
| 434 | struct scif_window *window) |
| 435 | { |
| 436 | int i, j; |
| 437 | |
| 438 | if (window->nr_lookup) { |
| 439 | struct scif_rma_lookup *lup = &window->dma_addr_lookup; |
| 440 | struct scif_rma_lookup *npup = &window->num_pages_lookup; |
| 441 | |
| 442 | for (i = 0, j = 0; i < window->nr_pages; |
| 443 | i += SCIF_NR_ADDR_IN_PAGE, j++) { |
| 444 | if (lup->lookup && lup->lookup[j]) |
| 445 | scif_unmap_single(lup->lookup[j], |
| 446 | remote_dev, |
| 447 | PAGE_SIZE); |
| 448 | if (npup->lookup && npup->lookup[j]) |
| 449 | scif_unmap_single(npup->lookup[j], |
| 450 | remote_dev, |
| 451 | PAGE_SIZE); |
| 452 | } |
| 453 | if (lup->lookup) |
| 454 | scif_free_coherent(lup->lookup, lup->offset, |
| 455 | remote_dev, window->nr_lookup * |
| 456 | sizeof(*lup->lookup)); |
| 457 | if (npup->lookup) |
| 458 | scif_free_coherent(npup->lookup, npup->offset, |
| 459 | remote_dev, window->nr_lookup * |
| 460 | sizeof(*npup->lookup)); |
| 461 | if (window->mapped_offset) |
| 462 | scif_unmap_single(window->mapped_offset, |
| 463 | remote_dev, sizeof(*window)); |
| 464 | window->nr_lookup = 0; |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | /** |
| 469 | * scif_create_remote_window: |
| 470 | * @ep: end point |
| 471 | * @nr_pages: number of pages in window |
| 472 | * |
| 473 | * Allocate and prepare a remote registration window. |
| 474 | */ |
| 475 | static struct scif_window * |
| 476 | scif_create_remote_window(struct scif_dev *scifdev, int nr_pages) |
| 477 | { |
| 478 | struct scif_window *window; |
| 479 | |
| 480 | might_sleep(); |
| 481 | window = scif_zalloc(sizeof(*window)); |
| 482 | if (!window) |
| 483 | goto error_ret; |
| 484 | |
| 485 | window->magic = SCIFEP_MAGIC; |
| 486 | window->nr_pages = nr_pages; |
| 487 | |
| 488 | window->dma_addr = scif_zalloc(nr_pages * sizeof(*window->dma_addr)); |
| 489 | if (!window->dma_addr) |
| 490 | goto error_window; |
| 491 | |
| 492 | window->num_pages = scif_zalloc(nr_pages * |
| 493 | sizeof(*window->num_pages)); |
| 494 | if (!window->num_pages) |
| 495 | goto error_window; |
| 496 | |
| 497 | if (scif_create_remote_lookup(scifdev, window)) |
| 498 | goto error_window; |
| 499 | |
| 500 | window->type = SCIF_WINDOW_PEER; |
| 501 | window->unreg_state = OP_IDLE; |
| 502 | INIT_LIST_HEAD(&window->list); |
| 503 | return window; |
| 504 | error_window: |
| 505 | scif_destroy_remote_window(window); |
| 506 | error_ret: |
| 507 | return NULL; |
| 508 | } |
| 509 | |
| 510 | /** |
| 511 | * scif_destroy_remote_window: |
| 512 | * @ep: end point |
| 513 | * @window: remote registration window |
| 514 | * |
| 515 | * Deallocate resources for remote window. |
| 516 | */ |
| 517 | void |
| 518 | scif_destroy_remote_window(struct scif_window *window) |
| 519 | { |
| 520 | scif_free(window->dma_addr, window->nr_pages * |
| 521 | sizeof(*window->dma_addr)); |
| 522 | scif_free(window->num_pages, window->nr_pages * |
| 523 | sizeof(*window->num_pages)); |
| 524 | window->magic = 0; |
| 525 | scif_free(window, sizeof(*window)); |
| 526 | } |
| 527 | |
| 528 | /** |
| 529 | * scif_iommu_map: create DMA mappings if the IOMMU is enabled |
| 530 | * @remote_dev: SCIF remote device |
| 531 | * @window: remote registration window |
| 532 | * |
| 533 | * Map the physical pages using dma_map_sg(..) and then detect the number |
| 534 | * of contiguous DMA mappings allocated |
| 535 | */ |
| 536 | static int scif_iommu_map(struct scif_dev *remote_dev, |
| 537 | struct scif_window *window) |
| 538 | { |
| 539 | struct scatterlist *sg; |
| 540 | int i, err; |
| 541 | scif_pinned_pages_t pin = window->pinned_pages; |
| 542 | |
| 543 | window->st = kzalloc(sizeof(*window->st), GFP_KERNEL); |
| 544 | if (!window->st) |
| 545 | return -ENOMEM; |
| 546 | |
| 547 | err = sg_alloc_table(window->st, window->nr_pages, GFP_KERNEL); |
| 548 | if (err) |
| 549 | return err; |
| 550 | |
| 551 | for_each_sg(window->st->sgl, sg, window->st->nents, i) |
| 552 | sg_set_page(sg, pin->pages[i], PAGE_SIZE, 0x0); |
| 553 | |
| 554 | err = dma_map_sg(&remote_dev->sdev->dev, window->st->sgl, |
| 555 | window->st->nents, DMA_BIDIRECTIONAL); |
| 556 | if (!err) |
| 557 | return -ENOMEM; |
| 558 | /* Detect contiguous ranges of DMA mappings */ |
| 559 | sg = window->st->sgl; |
| 560 | for (i = 0; sg; i++) { |
| 561 | dma_addr_t last_da; |
| 562 | |
| 563 | window->dma_addr[i] = sg_dma_address(sg); |
| 564 | window->num_pages[i] = sg_dma_len(sg) >> PAGE_SHIFT; |
| 565 | last_da = sg_dma_address(sg) + sg_dma_len(sg); |
| 566 | while ((sg = sg_next(sg)) && sg_dma_address(sg) == last_da) { |
| 567 | window->num_pages[i] += |
| 568 | (sg_dma_len(sg) >> PAGE_SHIFT); |
| 569 | last_da = window->dma_addr[i] + |
| 570 | sg_dma_len(sg); |
| 571 | } |
| 572 | window->nr_contig_chunks++; |
| 573 | } |
| 574 | return 0; |
| 575 | } |
| 576 | |
| 577 | /** |
| 578 | * scif_map_window: |
| 579 | * @remote_dev: SCIF remote device |
| 580 | * @window: self registration window |
| 581 | * |
| 582 | * Map pages of a window into the aperture/PCI. |
| 583 | * Also determine addresses required for DMA. |
| 584 | */ |
| 585 | int |
| 586 | scif_map_window(struct scif_dev *remote_dev, struct scif_window *window) |
| 587 | { |
| 588 | int i, j, k, err = 0, nr_contig_pages; |
| 589 | scif_pinned_pages_t pin; |
| 590 | phys_addr_t phys_prev, phys_curr; |
| 591 | |
| 592 | might_sleep(); |
| 593 | |
| 594 | pin = window->pinned_pages; |
| 595 | |
| 596 | if (intel_iommu_enabled && !scifdev_self(remote_dev)) |
| 597 | return scif_iommu_map(remote_dev, window); |
| 598 | |
| 599 | for (i = 0, j = 0; i < window->nr_pages; i += nr_contig_pages, j++) { |
| 600 | phys_prev = page_to_phys(pin->pages[i]); |
| 601 | nr_contig_pages = 1; |
| 602 | |
| 603 | /* Detect physically contiguous chunks */ |
| 604 | for (k = i + 1; k < window->nr_pages; k++) { |
| 605 | phys_curr = page_to_phys(pin->pages[k]); |
| 606 | if (phys_curr != (phys_prev + PAGE_SIZE)) |
| 607 | break; |
| 608 | phys_prev = phys_curr; |
| 609 | nr_contig_pages++; |
| 610 | } |
| 611 | window->num_pages[j] = nr_contig_pages; |
| 612 | window->nr_contig_chunks++; |
| 613 | if (scif_is_mgmt_node()) { |
| 614 | /* |
| 615 | * Management node has to deal with SMPT on X100 and |
| 616 | * hence the DMA mapping is required |
| 617 | */ |
| 618 | err = scif_map_single(&window->dma_addr[j], |
| 619 | phys_to_virt(page_to_phys( |
| 620 | pin->pages[i])), |
| 621 | remote_dev, |
| 622 | nr_contig_pages << PAGE_SHIFT); |
| 623 | if (err) |
| 624 | return err; |
| 625 | } else { |
| 626 | window->dma_addr[j] = page_to_phys(pin->pages[i]); |
| 627 | } |
| 628 | } |
| 629 | return err; |
| 630 | } |
| 631 | |
| 632 | /** |
| 633 | * scif_send_scif_unregister: |
| 634 | * @ep: end point |
| 635 | * @window: self registration window |
| 636 | * |
| 637 | * Send a SCIF_UNREGISTER message. |
| 638 | */ |
| 639 | static int scif_send_scif_unregister(struct scif_endpt *ep, |
| 640 | struct scif_window *window) |
| 641 | { |
| 642 | struct scifmsg msg; |
| 643 | |
| 644 | msg.uop = SCIF_UNREGISTER; |
| 645 | msg.src = ep->port; |
| 646 | msg.payload[0] = window->alloc_handle.vaddr; |
| 647 | msg.payload[1] = (u64)window; |
| 648 | return scif_nodeqp_send(ep->remote_dev, &msg); |
| 649 | } |
| 650 | |
| 651 | /** |
| 652 | * scif_unregister_window: |
| 653 | * @window: self registration window |
| 654 | * |
| 655 | * Send an unregistration request and wait for a response. |
| 656 | */ |
| 657 | int scif_unregister_window(struct scif_window *window) |
| 658 | { |
| 659 | int err = 0; |
| 660 | struct scif_endpt *ep = (struct scif_endpt *)window->ep; |
| 661 | bool send_msg = false; |
| 662 | |
| 663 | might_sleep(); |
| 664 | switch (window->unreg_state) { |
| 665 | case OP_IDLE: |
| 666 | { |
| 667 | window->unreg_state = OP_IN_PROGRESS; |
| 668 | send_msg = true; |
| 669 | /* fall through */ |
| 670 | } |
| 671 | case OP_IN_PROGRESS: |
| 672 | { |
| 673 | scif_get_window(window, 1); |
| 674 | mutex_unlock(&ep->rma_info.rma_lock); |
| 675 | if (send_msg) { |
| 676 | err = scif_send_scif_unregister(ep, window); |
| 677 | if (err) { |
| 678 | window->unreg_state = OP_COMPLETED; |
| 679 | goto done; |
| 680 | } |
| 681 | } else { |
| 682 | /* Return ENXIO since unregistration is in progress */ |
Dan Carpenter | ff65212 | 2015-10-13 15:52:06 +0300 | [diff] [blame^] | 683 | mutex_lock(&ep->rma_info.rma_lock); |
Sudeep Dutt | ba612aa | 2015-09-29 18:15:29 -0700 | [diff] [blame] | 684 | return -ENXIO; |
| 685 | } |
| 686 | retry: |
| 687 | /* Wait for a SCIF_UNREGISTER_(N)ACK message */ |
| 688 | err = wait_event_timeout(window->unregwq, |
| 689 | window->unreg_state != OP_IN_PROGRESS, |
| 690 | SCIF_NODE_ALIVE_TIMEOUT); |
| 691 | if (!err && scifdev_alive(ep)) |
| 692 | goto retry; |
| 693 | if (!err) { |
| 694 | err = -ENODEV; |
| 695 | window->unreg_state = OP_COMPLETED; |
| 696 | dev_err(scif_info.mdev.this_device, |
| 697 | "%s %d err %d\n", __func__, __LINE__, err); |
| 698 | } |
| 699 | if (err > 0) |
| 700 | err = 0; |
| 701 | done: |
| 702 | mutex_lock(&ep->rma_info.rma_lock); |
| 703 | scif_put_window(window, 1); |
| 704 | break; |
| 705 | } |
| 706 | case OP_FAILED: |
| 707 | { |
| 708 | if (!scifdev_alive(ep)) { |
| 709 | err = -ENODEV; |
| 710 | window->unreg_state = OP_COMPLETED; |
| 711 | } |
| 712 | break; |
| 713 | } |
| 714 | case OP_COMPLETED: |
| 715 | break; |
| 716 | default: |
| 717 | err = -ENODEV; |
| 718 | } |
| 719 | |
| 720 | if (window->unreg_state == OP_COMPLETED && window->ref_count) |
| 721 | scif_put_window(window, window->nr_pages); |
| 722 | |
| 723 | if (!window->ref_count) { |
| 724 | atomic_inc(&ep->rma_info.tw_refcount); |
| 725 | list_del_init(&window->list); |
| 726 | scif_free_window_offset(ep, window, window->offset); |
| 727 | mutex_unlock(&ep->rma_info.rma_lock); |
| 728 | if ((!!(window->pinned_pages->map_flags & SCIF_MAP_KERNEL)) && |
| 729 | scifdev_alive(ep)) { |
| 730 | scif_drain_dma_intr(ep->remote_dev->sdev, |
| 731 | ep->rma_info.dma_chan); |
| 732 | } else { |
| 733 | if (!__scif_dec_pinned_vm_lock(window->mm, |
| 734 | window->nr_pages, 1)) { |
| 735 | __scif_release_mm(window->mm); |
| 736 | window->mm = NULL; |
| 737 | } |
| 738 | } |
| 739 | scif_queue_for_cleanup(window, &scif_info.rma); |
| 740 | mutex_lock(&ep->rma_info.rma_lock); |
| 741 | } |
| 742 | return err; |
| 743 | } |
| 744 | |
| 745 | /** |
| 746 | * scif_send_alloc_request: |
| 747 | * @ep: end point |
| 748 | * @window: self registration window |
| 749 | * |
| 750 | * Send a remote window allocation request |
| 751 | */ |
| 752 | static int scif_send_alloc_request(struct scif_endpt *ep, |
| 753 | struct scif_window *window) |
| 754 | { |
| 755 | struct scifmsg msg; |
| 756 | struct scif_allocmsg *alloc = &window->alloc_handle; |
| 757 | |
| 758 | /* Set up the Alloc Handle */ |
| 759 | alloc->state = OP_IN_PROGRESS; |
| 760 | init_waitqueue_head(&alloc->allocwq); |
| 761 | |
| 762 | /* Send out an allocation request */ |
| 763 | msg.uop = SCIF_ALLOC_REQ; |
| 764 | msg.payload[1] = window->nr_pages; |
| 765 | msg.payload[2] = (u64)&window->alloc_handle; |
| 766 | return _scif_nodeqp_send(ep->remote_dev, &msg); |
| 767 | } |
| 768 | |
| 769 | /** |
| 770 | * scif_prep_remote_window: |
| 771 | * @ep: end point |
| 772 | * @window: self registration window |
| 773 | * |
| 774 | * Send a remote window allocation request, wait for an allocation response, |
| 775 | * and prepares the remote window by copying over the page lists |
| 776 | */ |
| 777 | static int scif_prep_remote_window(struct scif_endpt *ep, |
| 778 | struct scif_window *window) |
| 779 | { |
| 780 | struct scifmsg msg; |
| 781 | struct scif_window *remote_window; |
| 782 | struct scif_allocmsg *alloc = &window->alloc_handle; |
| 783 | dma_addr_t *dma_phys_lookup, *tmp, *num_pages_lookup, *tmp1; |
| 784 | int i = 0, j = 0; |
| 785 | int nr_contig_chunks, loop_nr_contig_chunks; |
| 786 | int remaining_nr_contig_chunks, nr_lookup; |
| 787 | int err, map_err; |
| 788 | |
| 789 | map_err = scif_map_window(ep->remote_dev, window); |
| 790 | if (map_err) |
| 791 | dev_err(&ep->remote_dev->sdev->dev, |
| 792 | "%s %d map_err %d\n", __func__, __LINE__, map_err); |
| 793 | remaining_nr_contig_chunks = window->nr_contig_chunks; |
| 794 | nr_contig_chunks = window->nr_contig_chunks; |
| 795 | retry: |
| 796 | /* Wait for a SCIF_ALLOC_GNT/REJ message */ |
| 797 | err = wait_event_timeout(alloc->allocwq, |
| 798 | alloc->state != OP_IN_PROGRESS, |
| 799 | SCIF_NODE_ALIVE_TIMEOUT); |
| 800 | mutex_lock(&ep->rma_info.rma_lock); |
| 801 | /* Synchronize with the thread waking up allocwq */ |
| 802 | mutex_unlock(&ep->rma_info.rma_lock); |
| 803 | if (!err && scifdev_alive(ep)) |
| 804 | goto retry; |
| 805 | |
| 806 | if (!err) |
| 807 | err = -ENODEV; |
| 808 | |
| 809 | if (err > 0) |
| 810 | err = 0; |
| 811 | else |
| 812 | return err; |
| 813 | |
| 814 | /* Bail out. The remote end rejected this request */ |
| 815 | if (alloc->state == OP_FAILED) |
| 816 | return -ENOMEM; |
| 817 | |
| 818 | if (map_err) { |
| 819 | dev_err(&ep->remote_dev->sdev->dev, |
| 820 | "%s %d err %d\n", __func__, __LINE__, map_err); |
| 821 | msg.uop = SCIF_FREE_VIRT; |
| 822 | msg.src = ep->port; |
| 823 | msg.payload[0] = ep->remote_ep; |
| 824 | msg.payload[1] = window->alloc_handle.vaddr; |
| 825 | msg.payload[2] = (u64)window; |
| 826 | msg.payload[3] = SCIF_REGISTER; |
| 827 | spin_lock(&ep->lock); |
| 828 | if (ep->state == SCIFEP_CONNECTED) |
| 829 | err = _scif_nodeqp_send(ep->remote_dev, &msg); |
| 830 | else |
| 831 | err = -ENOTCONN; |
| 832 | spin_unlock(&ep->lock); |
| 833 | return err; |
| 834 | } |
| 835 | |
| 836 | remote_window = scif_ioremap(alloc->phys_addr, sizeof(*window), |
| 837 | ep->remote_dev); |
| 838 | |
| 839 | /* Compute the number of lookup entries. 21 == 2MB Shift */ |
| 840 | nr_lookup = ALIGN(nr_contig_chunks, SCIF_NR_ADDR_IN_PAGE) |
| 841 | >> ilog2(SCIF_NR_ADDR_IN_PAGE); |
| 842 | |
| 843 | dma_phys_lookup = |
| 844 | scif_ioremap(remote_window->dma_addr_lookup.offset, |
| 845 | nr_lookup * |
| 846 | sizeof(*remote_window->dma_addr_lookup.lookup), |
| 847 | ep->remote_dev); |
| 848 | num_pages_lookup = |
| 849 | scif_ioremap(remote_window->num_pages_lookup.offset, |
| 850 | nr_lookup * |
| 851 | sizeof(*remote_window->num_pages_lookup.lookup), |
| 852 | ep->remote_dev); |
| 853 | |
| 854 | while (remaining_nr_contig_chunks) { |
| 855 | loop_nr_contig_chunks = min_t(int, remaining_nr_contig_chunks, |
| 856 | (int)SCIF_NR_ADDR_IN_PAGE); |
| 857 | /* #1/2 - Copy physical addresses over to the remote side */ |
| 858 | |
| 859 | /* #2/2 - Copy DMA addresses (addresses that are fed into the |
| 860 | * DMA engine) We transfer bus addresses which are then |
| 861 | * converted into a MIC physical address on the remote |
| 862 | * side if it is a MIC, if the remote node is a mgmt node we |
| 863 | * transfer the MIC physical address |
| 864 | */ |
| 865 | tmp = scif_ioremap(dma_phys_lookup[j], |
| 866 | loop_nr_contig_chunks * |
| 867 | sizeof(*window->dma_addr), |
| 868 | ep->remote_dev); |
| 869 | tmp1 = scif_ioremap(num_pages_lookup[j], |
| 870 | loop_nr_contig_chunks * |
| 871 | sizeof(*window->num_pages), |
| 872 | ep->remote_dev); |
| 873 | if (scif_is_mgmt_node()) { |
| 874 | memcpy_toio((void __force __iomem *)tmp, |
| 875 | &window->dma_addr[i], loop_nr_contig_chunks |
| 876 | * sizeof(*window->dma_addr)); |
| 877 | memcpy_toio((void __force __iomem *)tmp1, |
| 878 | &window->num_pages[i], loop_nr_contig_chunks |
| 879 | * sizeof(*window->num_pages)); |
| 880 | } else { |
| 881 | if (scifdev_is_p2p(ep->remote_dev)) { |
| 882 | /* |
| 883 | * add remote node's base address for this node |
| 884 | * to convert it into a MIC address |
| 885 | */ |
| 886 | int m; |
| 887 | dma_addr_t dma_addr; |
| 888 | |
| 889 | for (m = 0; m < loop_nr_contig_chunks; m++) { |
| 890 | dma_addr = window->dma_addr[i + m] + |
| 891 | ep->remote_dev->base_addr; |
| 892 | writeq(dma_addr, |
| 893 | (void __force __iomem *)&tmp[m]); |
| 894 | } |
| 895 | memcpy_toio((void __force __iomem *)tmp1, |
| 896 | &window->num_pages[i], |
| 897 | loop_nr_contig_chunks |
| 898 | * sizeof(*window->num_pages)); |
| 899 | } else { |
| 900 | /* Mgmt node or loopback - transfer DMA |
| 901 | * addresses as is, this is the same as a |
| 902 | * MIC physical address (we use the dma_addr |
| 903 | * and not the phys_addr array since the |
| 904 | * phys_addr is only setup if there is a mmap() |
| 905 | * request from the mgmt node) |
| 906 | */ |
| 907 | memcpy_toio((void __force __iomem *)tmp, |
| 908 | &window->dma_addr[i], |
| 909 | loop_nr_contig_chunks * |
| 910 | sizeof(*window->dma_addr)); |
| 911 | memcpy_toio((void __force __iomem *)tmp1, |
| 912 | &window->num_pages[i], |
| 913 | loop_nr_contig_chunks * |
| 914 | sizeof(*window->num_pages)); |
| 915 | } |
| 916 | } |
| 917 | remaining_nr_contig_chunks -= loop_nr_contig_chunks; |
| 918 | i += loop_nr_contig_chunks; |
| 919 | j++; |
| 920 | scif_iounmap(tmp, loop_nr_contig_chunks * |
| 921 | sizeof(*window->dma_addr), ep->remote_dev); |
| 922 | scif_iounmap(tmp1, loop_nr_contig_chunks * |
| 923 | sizeof(*window->num_pages), ep->remote_dev); |
| 924 | } |
| 925 | |
| 926 | /* Prepare the remote window for the peer */ |
| 927 | remote_window->peer_window = (u64)window; |
| 928 | remote_window->offset = window->offset; |
| 929 | remote_window->prot = window->prot; |
| 930 | remote_window->nr_contig_chunks = nr_contig_chunks; |
| 931 | remote_window->ep = ep->remote_ep; |
| 932 | scif_iounmap(num_pages_lookup, |
| 933 | nr_lookup * |
| 934 | sizeof(*remote_window->num_pages_lookup.lookup), |
| 935 | ep->remote_dev); |
| 936 | scif_iounmap(dma_phys_lookup, |
| 937 | nr_lookup * |
| 938 | sizeof(*remote_window->dma_addr_lookup.lookup), |
| 939 | ep->remote_dev); |
| 940 | scif_iounmap(remote_window, sizeof(*remote_window), ep->remote_dev); |
| 941 | window->peer_window = alloc->vaddr; |
| 942 | return err; |
| 943 | } |
| 944 | |
| 945 | /** |
| 946 | * scif_send_scif_register: |
| 947 | * @ep: end point |
| 948 | * @window: self registration window |
| 949 | * |
| 950 | * Send a SCIF_REGISTER message if EP is connected and wait for a |
| 951 | * SCIF_REGISTER_(N)ACK message else send a SCIF_FREE_VIRT |
| 952 | * message so that the peer can free its remote window allocated earlier. |
| 953 | */ |
| 954 | static int scif_send_scif_register(struct scif_endpt *ep, |
| 955 | struct scif_window *window) |
| 956 | { |
| 957 | int err = 0; |
| 958 | struct scifmsg msg; |
| 959 | |
| 960 | msg.src = ep->port; |
| 961 | msg.payload[0] = ep->remote_ep; |
| 962 | msg.payload[1] = window->alloc_handle.vaddr; |
| 963 | msg.payload[2] = (u64)window; |
| 964 | spin_lock(&ep->lock); |
| 965 | if (ep->state == SCIFEP_CONNECTED) { |
| 966 | msg.uop = SCIF_REGISTER; |
| 967 | window->reg_state = OP_IN_PROGRESS; |
| 968 | err = _scif_nodeqp_send(ep->remote_dev, &msg); |
| 969 | spin_unlock(&ep->lock); |
| 970 | if (!err) { |
| 971 | retry: |
| 972 | /* Wait for a SCIF_REGISTER_(N)ACK message */ |
| 973 | err = wait_event_timeout(window->regwq, |
| 974 | window->reg_state != |
| 975 | OP_IN_PROGRESS, |
| 976 | SCIF_NODE_ALIVE_TIMEOUT); |
| 977 | if (!err && scifdev_alive(ep)) |
| 978 | goto retry; |
| 979 | err = !err ? -ENODEV : 0; |
| 980 | if (window->reg_state == OP_FAILED) |
| 981 | err = -ENOTCONN; |
| 982 | } |
| 983 | } else { |
| 984 | msg.uop = SCIF_FREE_VIRT; |
| 985 | msg.payload[3] = SCIF_REGISTER; |
| 986 | err = _scif_nodeqp_send(ep->remote_dev, &msg); |
| 987 | spin_unlock(&ep->lock); |
| 988 | if (!err) |
| 989 | err = -ENOTCONN; |
| 990 | } |
| 991 | return err; |
| 992 | } |
| 993 | |
| 994 | /** |
| 995 | * scif_get_window_offset: |
| 996 | * @ep: end point descriptor |
| 997 | * @flags: flags |
| 998 | * @offset: offset hint |
| 999 | * @num_pages: number of pages |
| 1000 | * @out_offset: computed offset returned by reference. |
| 1001 | * |
| 1002 | * Compute/Claim a new offset for this EP. |
| 1003 | */ |
| 1004 | int scif_get_window_offset(struct scif_endpt *ep, int flags, s64 offset, |
| 1005 | int num_pages, s64 *out_offset) |
| 1006 | { |
| 1007 | s64 page_index; |
| 1008 | struct iova *iova_ptr; |
| 1009 | int err = 0; |
| 1010 | |
| 1011 | if (flags & SCIF_MAP_FIXED) { |
| 1012 | page_index = SCIF_IOVA_PFN(offset); |
| 1013 | iova_ptr = reserve_iova(&ep->rma_info.iovad, page_index, |
| 1014 | page_index + num_pages - 1); |
| 1015 | if (!iova_ptr) |
| 1016 | err = -EADDRINUSE; |
| 1017 | } else { |
| 1018 | iova_ptr = alloc_iova(&ep->rma_info.iovad, num_pages, |
| 1019 | SCIF_DMA_63BIT_PFN - 1, 0); |
| 1020 | if (!iova_ptr) |
| 1021 | err = -ENOMEM; |
| 1022 | } |
| 1023 | if (!err) |
| 1024 | *out_offset = (iova_ptr->pfn_lo) << PAGE_SHIFT; |
| 1025 | return err; |
| 1026 | } |
| 1027 | |
| 1028 | /** |
| 1029 | * scif_free_window_offset: |
| 1030 | * @ep: end point descriptor |
| 1031 | * @window: registration window |
| 1032 | * @offset: Offset to be freed |
| 1033 | * |
| 1034 | * Free offset for this EP. The callee is supposed to grab |
| 1035 | * the RMA mutex before calling this API. |
| 1036 | */ |
| 1037 | void scif_free_window_offset(struct scif_endpt *ep, |
| 1038 | struct scif_window *window, s64 offset) |
| 1039 | { |
| 1040 | if ((window && !window->offset_freed) || !window) { |
| 1041 | free_iova(&ep->rma_info.iovad, offset >> PAGE_SHIFT); |
| 1042 | if (window) |
| 1043 | window->offset_freed = true; |
| 1044 | } |
| 1045 | } |
| 1046 | |
| 1047 | /** |
| 1048 | * scif_alloc_req: Respond to SCIF_ALLOC_REQ interrupt message |
| 1049 | * @msg: Interrupt message |
| 1050 | * |
| 1051 | * Remote side is requesting a memory allocation. |
| 1052 | */ |
| 1053 | void scif_alloc_req(struct scif_dev *scifdev, struct scifmsg *msg) |
| 1054 | { |
| 1055 | int err; |
| 1056 | struct scif_window *window = NULL; |
| 1057 | int nr_pages = msg->payload[1]; |
| 1058 | |
| 1059 | window = scif_create_remote_window(scifdev, nr_pages); |
| 1060 | if (!window) { |
| 1061 | err = -ENOMEM; |
| 1062 | goto error; |
| 1063 | } |
| 1064 | |
| 1065 | /* The peer's allocation request is granted */ |
| 1066 | msg->uop = SCIF_ALLOC_GNT; |
| 1067 | msg->payload[0] = (u64)window; |
| 1068 | msg->payload[1] = window->mapped_offset; |
| 1069 | err = scif_nodeqp_send(scifdev, msg); |
| 1070 | if (err) |
| 1071 | scif_destroy_remote_window(window); |
| 1072 | return; |
| 1073 | error: |
| 1074 | /* The peer's allocation request is rejected */ |
| 1075 | dev_err(&scifdev->sdev->dev, |
| 1076 | "%s %d error %d alloc_ptr %p nr_pages 0x%x\n", |
| 1077 | __func__, __LINE__, err, window, nr_pages); |
| 1078 | msg->uop = SCIF_ALLOC_REJ; |
| 1079 | scif_nodeqp_send(scifdev, msg); |
| 1080 | } |
| 1081 | |
| 1082 | /** |
| 1083 | * scif_alloc_gnt_rej: Respond to SCIF_ALLOC_GNT/REJ interrupt message |
| 1084 | * @msg: Interrupt message |
| 1085 | * |
| 1086 | * Remote side responded to a memory allocation. |
| 1087 | */ |
| 1088 | void scif_alloc_gnt_rej(struct scif_dev *scifdev, struct scifmsg *msg) |
| 1089 | { |
| 1090 | struct scif_allocmsg *handle = (struct scif_allocmsg *)msg->payload[2]; |
| 1091 | struct scif_window *window = container_of(handle, struct scif_window, |
| 1092 | alloc_handle); |
| 1093 | struct scif_endpt *ep = (struct scif_endpt *)window->ep; |
| 1094 | |
| 1095 | mutex_lock(&ep->rma_info.rma_lock); |
| 1096 | handle->vaddr = msg->payload[0]; |
| 1097 | handle->phys_addr = msg->payload[1]; |
| 1098 | if (msg->uop == SCIF_ALLOC_GNT) |
| 1099 | handle->state = OP_COMPLETED; |
| 1100 | else |
| 1101 | handle->state = OP_FAILED; |
| 1102 | wake_up(&handle->allocwq); |
| 1103 | mutex_unlock(&ep->rma_info.rma_lock); |
| 1104 | } |
| 1105 | |
| 1106 | /** |
| 1107 | * scif_free_virt: Respond to SCIF_FREE_VIRT interrupt message |
| 1108 | * @msg: Interrupt message |
| 1109 | * |
| 1110 | * Free up memory kmalloc'd earlier. |
| 1111 | */ |
| 1112 | void scif_free_virt(struct scif_dev *scifdev, struct scifmsg *msg) |
| 1113 | { |
| 1114 | struct scif_window *window = (struct scif_window *)msg->payload[1]; |
| 1115 | |
| 1116 | scif_destroy_remote_window(window); |
| 1117 | } |
| 1118 | |
| 1119 | static void |
| 1120 | scif_fixup_aper_base(struct scif_dev *dev, struct scif_window *window) |
| 1121 | { |
| 1122 | int j; |
| 1123 | struct scif_hw_dev *sdev = dev->sdev; |
| 1124 | phys_addr_t apt_base = 0; |
| 1125 | |
| 1126 | /* |
| 1127 | * Add the aperture base if the DMA address is not card relative |
| 1128 | * since the DMA addresses need to be an offset into the bar |
| 1129 | */ |
| 1130 | if (!scifdev_self(dev) && window->type == SCIF_WINDOW_PEER && |
| 1131 | sdev->aper && !sdev->card_rel_da) |
| 1132 | apt_base = sdev->aper->pa; |
| 1133 | else |
| 1134 | return; |
| 1135 | |
| 1136 | for (j = 0; j < window->nr_contig_chunks; j++) { |
| 1137 | if (window->num_pages[j]) |
| 1138 | window->dma_addr[j] += apt_base; |
| 1139 | else |
| 1140 | break; |
| 1141 | } |
| 1142 | } |
| 1143 | |
| 1144 | /** |
| 1145 | * scif_recv_reg: Respond to SCIF_REGISTER interrupt message |
| 1146 | * @msg: Interrupt message |
| 1147 | * |
| 1148 | * Update remote window list with a new registered window. |
| 1149 | */ |
| 1150 | void scif_recv_reg(struct scif_dev *scifdev, struct scifmsg *msg) |
| 1151 | { |
| 1152 | struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0]; |
| 1153 | struct scif_window *window = |
| 1154 | (struct scif_window *)msg->payload[1]; |
| 1155 | |
| 1156 | mutex_lock(&ep->rma_info.rma_lock); |
| 1157 | spin_lock(&ep->lock); |
| 1158 | if (ep->state == SCIFEP_CONNECTED) { |
| 1159 | msg->uop = SCIF_REGISTER_ACK; |
| 1160 | scif_nodeqp_send(ep->remote_dev, msg); |
| 1161 | scif_fixup_aper_base(ep->remote_dev, window); |
| 1162 | /* No further failures expected. Insert new window */ |
| 1163 | scif_insert_window(window, &ep->rma_info.remote_reg_list); |
| 1164 | } else { |
| 1165 | msg->uop = SCIF_REGISTER_NACK; |
| 1166 | scif_nodeqp_send(ep->remote_dev, msg); |
| 1167 | } |
| 1168 | spin_unlock(&ep->lock); |
| 1169 | mutex_unlock(&ep->rma_info.rma_lock); |
| 1170 | /* free up any lookup resources now that page lists are transferred */ |
| 1171 | scif_destroy_remote_lookup(ep->remote_dev, window); |
| 1172 | /* |
| 1173 | * We could not insert the window but we need to |
| 1174 | * destroy the window. |
| 1175 | */ |
| 1176 | if (msg->uop == SCIF_REGISTER_NACK) |
| 1177 | scif_destroy_remote_window(window); |
| 1178 | } |
| 1179 | |
| 1180 | /** |
| 1181 | * scif_recv_unreg: Respond to SCIF_UNREGISTER interrupt message |
| 1182 | * @msg: Interrupt message |
| 1183 | * |
| 1184 | * Remove window from remote registration list; |
| 1185 | */ |
| 1186 | void scif_recv_unreg(struct scif_dev *scifdev, struct scifmsg *msg) |
| 1187 | { |
| 1188 | struct scif_rma_req req; |
| 1189 | struct scif_window *window = NULL; |
| 1190 | struct scif_window *recv_window = |
| 1191 | (struct scif_window *)msg->payload[0]; |
| 1192 | struct scif_endpt *ep; |
| 1193 | int del_window = 0; |
| 1194 | |
| 1195 | ep = (struct scif_endpt *)recv_window->ep; |
| 1196 | req.out_window = &window; |
| 1197 | req.offset = recv_window->offset; |
| 1198 | req.prot = 0; |
| 1199 | req.nr_bytes = recv_window->nr_pages << PAGE_SHIFT; |
| 1200 | req.type = SCIF_WINDOW_FULL; |
| 1201 | req.head = &ep->rma_info.remote_reg_list; |
| 1202 | msg->payload[0] = ep->remote_ep; |
| 1203 | |
| 1204 | mutex_lock(&ep->rma_info.rma_lock); |
| 1205 | /* Does a valid window exist? */ |
| 1206 | if (scif_query_window(&req)) { |
| 1207 | dev_err(&scifdev->sdev->dev, |
| 1208 | "%s %d -ENXIO\n", __func__, __LINE__); |
| 1209 | msg->uop = SCIF_UNREGISTER_ACK; |
| 1210 | goto error; |
| 1211 | } |
| 1212 | if (window) { |
| 1213 | if (window->ref_count) |
| 1214 | scif_put_window(window, window->nr_pages); |
| 1215 | else |
| 1216 | dev_err(&scifdev->sdev->dev, |
| 1217 | "%s %d ref count should be +ve\n", |
| 1218 | __func__, __LINE__); |
| 1219 | window->unreg_state = OP_COMPLETED; |
| 1220 | if (!window->ref_count) { |
| 1221 | msg->uop = SCIF_UNREGISTER_ACK; |
| 1222 | atomic_inc(&ep->rma_info.tw_refcount); |
| 1223 | ep->rma_info.async_list_del = 1; |
| 1224 | list_del_init(&window->list); |
| 1225 | del_window = 1; |
| 1226 | } else { |
| 1227 | /* NACK! There are valid references to this window */ |
| 1228 | msg->uop = SCIF_UNREGISTER_NACK; |
| 1229 | } |
| 1230 | } else { |
| 1231 | /* The window did not make its way to the list at all. ACK */ |
| 1232 | msg->uop = SCIF_UNREGISTER_ACK; |
| 1233 | scif_destroy_remote_window(recv_window); |
| 1234 | } |
| 1235 | error: |
| 1236 | mutex_unlock(&ep->rma_info.rma_lock); |
| 1237 | if (del_window) |
| 1238 | scif_drain_dma_intr(ep->remote_dev->sdev, |
| 1239 | ep->rma_info.dma_chan); |
| 1240 | scif_nodeqp_send(ep->remote_dev, msg); |
| 1241 | if (del_window) |
| 1242 | scif_queue_for_cleanup(window, &scif_info.rma); |
| 1243 | } |
| 1244 | |
| 1245 | /** |
| 1246 | * scif_recv_reg_ack: Respond to SCIF_REGISTER_ACK interrupt message |
| 1247 | * @msg: Interrupt message |
| 1248 | * |
| 1249 | * Wake up the window waiting to complete registration. |
| 1250 | */ |
| 1251 | void scif_recv_reg_ack(struct scif_dev *scifdev, struct scifmsg *msg) |
| 1252 | { |
| 1253 | struct scif_window *window = |
| 1254 | (struct scif_window *)msg->payload[2]; |
| 1255 | struct scif_endpt *ep = (struct scif_endpt *)window->ep; |
| 1256 | |
| 1257 | mutex_lock(&ep->rma_info.rma_lock); |
| 1258 | window->reg_state = OP_COMPLETED; |
| 1259 | wake_up(&window->regwq); |
| 1260 | mutex_unlock(&ep->rma_info.rma_lock); |
| 1261 | } |
| 1262 | |
| 1263 | /** |
| 1264 | * scif_recv_reg_nack: Respond to SCIF_REGISTER_NACK interrupt message |
| 1265 | * @msg: Interrupt message |
| 1266 | * |
| 1267 | * Wake up the window waiting to inform it that registration |
| 1268 | * cannot be completed. |
| 1269 | */ |
| 1270 | void scif_recv_reg_nack(struct scif_dev *scifdev, struct scifmsg *msg) |
| 1271 | { |
| 1272 | struct scif_window *window = |
| 1273 | (struct scif_window *)msg->payload[2]; |
| 1274 | struct scif_endpt *ep = (struct scif_endpt *)window->ep; |
| 1275 | |
| 1276 | mutex_lock(&ep->rma_info.rma_lock); |
| 1277 | window->reg_state = OP_FAILED; |
| 1278 | wake_up(&window->regwq); |
| 1279 | mutex_unlock(&ep->rma_info.rma_lock); |
| 1280 | } |
| 1281 | |
| 1282 | /** |
| 1283 | * scif_recv_unreg_ack: Respond to SCIF_UNREGISTER_ACK interrupt message |
| 1284 | * @msg: Interrupt message |
| 1285 | * |
| 1286 | * Wake up the window waiting to complete unregistration. |
| 1287 | */ |
| 1288 | void scif_recv_unreg_ack(struct scif_dev *scifdev, struct scifmsg *msg) |
| 1289 | { |
| 1290 | struct scif_window *window = |
| 1291 | (struct scif_window *)msg->payload[1]; |
| 1292 | struct scif_endpt *ep = (struct scif_endpt *)window->ep; |
| 1293 | |
| 1294 | mutex_lock(&ep->rma_info.rma_lock); |
| 1295 | window->unreg_state = OP_COMPLETED; |
| 1296 | wake_up(&window->unregwq); |
| 1297 | mutex_unlock(&ep->rma_info.rma_lock); |
| 1298 | } |
| 1299 | |
| 1300 | /** |
| 1301 | * scif_recv_unreg_nack: Respond to SCIF_UNREGISTER_NACK interrupt message |
| 1302 | * @msg: Interrupt message |
| 1303 | * |
| 1304 | * Wake up the window waiting to inform it that unregistration |
| 1305 | * cannot be completed immediately. |
| 1306 | */ |
| 1307 | void scif_recv_unreg_nack(struct scif_dev *scifdev, struct scifmsg *msg) |
| 1308 | { |
| 1309 | struct scif_window *window = |
| 1310 | (struct scif_window *)msg->payload[1]; |
| 1311 | struct scif_endpt *ep = (struct scif_endpt *)window->ep; |
| 1312 | |
| 1313 | mutex_lock(&ep->rma_info.rma_lock); |
| 1314 | window->unreg_state = OP_FAILED; |
| 1315 | wake_up(&window->unregwq); |
| 1316 | mutex_unlock(&ep->rma_info.rma_lock); |
| 1317 | } |
| 1318 | |
| 1319 | int __scif_pin_pages(void *addr, size_t len, int *out_prot, |
| 1320 | int map_flags, scif_pinned_pages_t *pages) |
| 1321 | { |
| 1322 | struct scif_pinned_pages *pinned_pages; |
| 1323 | int nr_pages, err = 0, i; |
| 1324 | bool vmalloc_addr = false; |
| 1325 | bool try_upgrade = false; |
| 1326 | int prot = *out_prot; |
| 1327 | int ulimit = 0; |
| 1328 | struct mm_struct *mm = NULL; |
| 1329 | |
| 1330 | /* Unsupported flags */ |
| 1331 | if (map_flags & ~(SCIF_MAP_KERNEL | SCIF_MAP_ULIMIT)) |
| 1332 | return -EINVAL; |
| 1333 | ulimit = !!(map_flags & SCIF_MAP_ULIMIT); |
| 1334 | |
| 1335 | /* Unsupported protection requested */ |
| 1336 | if (prot & ~(SCIF_PROT_READ | SCIF_PROT_WRITE)) |
| 1337 | return -EINVAL; |
| 1338 | |
| 1339 | /* addr/len must be page aligned. len should be non zero */ |
| 1340 | if (!len || |
| 1341 | (ALIGN((u64)addr, PAGE_SIZE) != (u64)addr) || |
| 1342 | (ALIGN((u64)len, PAGE_SIZE) != (u64)len)) |
| 1343 | return -EINVAL; |
| 1344 | |
| 1345 | might_sleep(); |
| 1346 | |
| 1347 | nr_pages = len >> PAGE_SHIFT; |
| 1348 | |
| 1349 | /* Allocate a set of pinned pages */ |
| 1350 | pinned_pages = scif_create_pinned_pages(nr_pages, prot); |
| 1351 | if (!pinned_pages) |
| 1352 | return -ENOMEM; |
| 1353 | |
| 1354 | if (map_flags & SCIF_MAP_KERNEL) { |
| 1355 | if (is_vmalloc_addr(addr)) |
| 1356 | vmalloc_addr = true; |
| 1357 | |
| 1358 | for (i = 0; i < nr_pages; i++) { |
| 1359 | if (vmalloc_addr) |
| 1360 | pinned_pages->pages[i] = |
| 1361 | vmalloc_to_page(addr + (i * PAGE_SIZE)); |
| 1362 | else |
| 1363 | pinned_pages->pages[i] = |
| 1364 | virt_to_page(addr + (i * PAGE_SIZE)); |
| 1365 | } |
| 1366 | pinned_pages->nr_pages = nr_pages; |
| 1367 | pinned_pages->map_flags = SCIF_MAP_KERNEL; |
| 1368 | } else { |
| 1369 | /* |
| 1370 | * SCIF supports registration caching. If a registration has |
| 1371 | * been requested with read only permissions, then we try |
| 1372 | * to pin the pages with RW permissions so that a subsequent |
| 1373 | * transfer with RW permission can hit the cache instead of |
| 1374 | * invalidating it. If the upgrade fails with RW then we |
| 1375 | * revert back to R permission and retry |
| 1376 | */ |
| 1377 | if (prot == SCIF_PROT_READ) |
| 1378 | try_upgrade = true; |
| 1379 | prot |= SCIF_PROT_WRITE; |
| 1380 | retry: |
| 1381 | mm = current->mm; |
| 1382 | down_write(&mm->mmap_sem); |
| 1383 | if (ulimit) { |
| 1384 | err = __scif_check_inc_pinned_vm(mm, nr_pages); |
| 1385 | if (err) { |
| 1386 | up_write(&mm->mmap_sem); |
| 1387 | pinned_pages->nr_pages = 0; |
| 1388 | goto error_unmap; |
| 1389 | } |
| 1390 | } |
| 1391 | |
| 1392 | pinned_pages->nr_pages = get_user_pages( |
| 1393 | current, |
| 1394 | mm, |
| 1395 | (u64)addr, |
| 1396 | nr_pages, |
| 1397 | !!(prot & SCIF_PROT_WRITE), |
| 1398 | 0, |
| 1399 | pinned_pages->pages, |
| 1400 | NULL); |
| 1401 | up_write(&mm->mmap_sem); |
| 1402 | if (nr_pages != pinned_pages->nr_pages) { |
| 1403 | if (try_upgrade) { |
| 1404 | if (ulimit) |
| 1405 | __scif_dec_pinned_vm_lock(mm, |
| 1406 | nr_pages, 0); |
| 1407 | /* Roll back any pinned pages */ |
| 1408 | for (i = 0; i < pinned_pages->nr_pages; i++) { |
| 1409 | if (pinned_pages->pages[i]) |
| 1410 | put_page( |
| 1411 | pinned_pages->pages[i]); |
| 1412 | } |
| 1413 | prot &= ~SCIF_PROT_WRITE; |
| 1414 | try_upgrade = false; |
| 1415 | goto retry; |
| 1416 | } |
| 1417 | } |
| 1418 | pinned_pages->map_flags = 0; |
| 1419 | } |
| 1420 | |
| 1421 | if (pinned_pages->nr_pages < nr_pages) { |
| 1422 | err = -EFAULT; |
| 1423 | pinned_pages->nr_pages = nr_pages; |
| 1424 | goto dec_pinned; |
| 1425 | } |
| 1426 | |
| 1427 | *out_prot = prot; |
| 1428 | atomic_set(&pinned_pages->ref_count, 1); |
| 1429 | *pages = pinned_pages; |
| 1430 | return err; |
| 1431 | dec_pinned: |
| 1432 | if (ulimit) |
| 1433 | __scif_dec_pinned_vm_lock(mm, nr_pages, 0); |
| 1434 | /* Something went wrong! Rollback */ |
| 1435 | error_unmap: |
| 1436 | pinned_pages->nr_pages = nr_pages; |
| 1437 | scif_destroy_pinned_pages(pinned_pages); |
| 1438 | *pages = NULL; |
| 1439 | dev_dbg(scif_info.mdev.this_device, |
| 1440 | "%s %d err %d len 0x%lx\n", __func__, __LINE__, err, len); |
| 1441 | return err; |
| 1442 | } |
| 1443 | |
| 1444 | int scif_pin_pages(void *addr, size_t len, int prot, |
| 1445 | int map_flags, scif_pinned_pages_t *pages) |
| 1446 | { |
| 1447 | return __scif_pin_pages(addr, len, &prot, map_flags, pages); |
| 1448 | } |
| 1449 | EXPORT_SYMBOL_GPL(scif_pin_pages); |
| 1450 | |
| 1451 | int scif_unpin_pages(scif_pinned_pages_t pinned_pages) |
| 1452 | { |
| 1453 | int err = 0, ret; |
| 1454 | |
| 1455 | if (!pinned_pages || SCIFEP_MAGIC != pinned_pages->magic) |
| 1456 | return -EINVAL; |
| 1457 | |
| 1458 | ret = atomic_sub_return(1, &pinned_pages->ref_count); |
| 1459 | if (ret < 0) { |
| 1460 | dev_err(scif_info.mdev.this_device, |
| 1461 | "%s %d scif_unpin_pages called without pinning? rc %d\n", |
| 1462 | __func__, __LINE__, ret); |
| 1463 | return -EINVAL; |
| 1464 | } |
| 1465 | /* |
| 1466 | * Destroy the window if the ref count for this set of pinned |
| 1467 | * pages has dropped to zero. If it is positive then there is |
| 1468 | * a valid registered window which is backed by these pages and |
| 1469 | * it will be destroyed once all such windows are unregistered. |
| 1470 | */ |
| 1471 | if (!ret) |
| 1472 | err = scif_destroy_pinned_pages(pinned_pages); |
| 1473 | |
| 1474 | return err; |
| 1475 | } |
| 1476 | EXPORT_SYMBOL_GPL(scif_unpin_pages); |
| 1477 | |
| 1478 | static inline void |
| 1479 | scif_insert_local_window(struct scif_window *window, struct scif_endpt *ep) |
| 1480 | { |
| 1481 | mutex_lock(&ep->rma_info.rma_lock); |
| 1482 | scif_insert_window(window, &ep->rma_info.reg_list); |
| 1483 | mutex_unlock(&ep->rma_info.rma_lock); |
| 1484 | } |
| 1485 | |
| 1486 | off_t scif_register_pinned_pages(scif_epd_t epd, |
| 1487 | scif_pinned_pages_t pinned_pages, |
| 1488 | off_t offset, int map_flags) |
| 1489 | { |
| 1490 | struct scif_endpt *ep = (struct scif_endpt *)epd; |
| 1491 | s64 computed_offset; |
| 1492 | struct scif_window *window; |
| 1493 | int err; |
| 1494 | size_t len; |
| 1495 | struct device *spdev; |
| 1496 | |
| 1497 | /* Unsupported flags */ |
| 1498 | if (map_flags & ~SCIF_MAP_FIXED) |
| 1499 | return -EINVAL; |
| 1500 | |
| 1501 | len = pinned_pages->nr_pages << PAGE_SHIFT; |
| 1502 | |
| 1503 | /* |
| 1504 | * Offset is not page aligned/negative or offset+len |
| 1505 | * wraps around with SCIF_MAP_FIXED. |
| 1506 | */ |
| 1507 | if ((map_flags & SCIF_MAP_FIXED) && |
| 1508 | ((ALIGN(offset, PAGE_SIZE) != offset) || |
| 1509 | (offset < 0) || |
| 1510 | (offset + (off_t)len < offset))) |
| 1511 | return -EINVAL; |
| 1512 | |
| 1513 | might_sleep(); |
| 1514 | |
| 1515 | err = scif_verify_epd(ep); |
| 1516 | if (err) |
| 1517 | return err; |
| 1518 | /* |
| 1519 | * It is an error to pass pinned_pages to scif_register_pinned_pages() |
| 1520 | * after calling scif_unpin_pages(). |
| 1521 | */ |
| 1522 | if (!atomic_add_unless(&pinned_pages->ref_count, 1, 0)) |
| 1523 | return -EINVAL; |
| 1524 | |
| 1525 | /* Compute the offset for this registration */ |
| 1526 | err = scif_get_window_offset(ep, map_flags, offset, |
| 1527 | len, &computed_offset); |
| 1528 | if (err) { |
| 1529 | atomic_sub(1, &pinned_pages->ref_count); |
| 1530 | return err; |
| 1531 | } |
| 1532 | |
| 1533 | /* Allocate and prepare self registration window */ |
| 1534 | window = scif_create_window(ep, pinned_pages->nr_pages, |
| 1535 | computed_offset, false); |
| 1536 | if (!window) { |
| 1537 | atomic_sub(1, &pinned_pages->ref_count); |
| 1538 | scif_free_window_offset(ep, NULL, computed_offset); |
| 1539 | return -ENOMEM; |
| 1540 | } |
| 1541 | |
| 1542 | window->pinned_pages = pinned_pages; |
| 1543 | window->nr_pages = pinned_pages->nr_pages; |
| 1544 | window->prot = pinned_pages->prot; |
| 1545 | |
| 1546 | spdev = scif_get_peer_dev(ep->remote_dev); |
| 1547 | if (IS_ERR(spdev)) { |
| 1548 | err = PTR_ERR(spdev); |
| 1549 | scif_destroy_window(ep, window); |
| 1550 | return err; |
| 1551 | } |
| 1552 | err = scif_send_alloc_request(ep, window); |
| 1553 | if (err) { |
| 1554 | dev_err(&ep->remote_dev->sdev->dev, |
| 1555 | "%s %d err %d\n", __func__, __LINE__, err); |
| 1556 | goto error_unmap; |
| 1557 | } |
| 1558 | |
| 1559 | /* Prepare the remote registration window */ |
| 1560 | err = scif_prep_remote_window(ep, window); |
| 1561 | if (err) { |
| 1562 | dev_err(&ep->remote_dev->sdev->dev, |
| 1563 | "%s %d err %d\n", __func__, __LINE__, err); |
| 1564 | goto error_unmap; |
| 1565 | } |
| 1566 | |
| 1567 | /* Tell the peer about the new window */ |
| 1568 | err = scif_send_scif_register(ep, window); |
| 1569 | if (err) { |
| 1570 | dev_err(&ep->remote_dev->sdev->dev, |
| 1571 | "%s %d err %d\n", __func__, __LINE__, err); |
| 1572 | goto error_unmap; |
| 1573 | } |
| 1574 | |
| 1575 | scif_put_peer_dev(spdev); |
| 1576 | /* No further failures expected. Insert new window */ |
| 1577 | scif_insert_local_window(window, ep); |
| 1578 | return computed_offset; |
| 1579 | error_unmap: |
| 1580 | scif_destroy_window(ep, window); |
| 1581 | scif_put_peer_dev(spdev); |
| 1582 | dev_err(&ep->remote_dev->sdev->dev, |
| 1583 | "%s %d err %d\n", __func__, __LINE__, err); |
| 1584 | return err; |
| 1585 | } |
| 1586 | EXPORT_SYMBOL_GPL(scif_register_pinned_pages); |
| 1587 | |
| 1588 | off_t scif_register(scif_epd_t epd, void *addr, size_t len, off_t offset, |
| 1589 | int prot, int map_flags) |
| 1590 | { |
| 1591 | scif_pinned_pages_t pinned_pages; |
| 1592 | off_t err; |
| 1593 | struct scif_endpt *ep = (struct scif_endpt *)epd; |
| 1594 | s64 computed_offset; |
| 1595 | struct scif_window *window; |
| 1596 | struct mm_struct *mm = NULL; |
| 1597 | struct device *spdev; |
| 1598 | |
| 1599 | dev_dbg(scif_info.mdev.this_device, |
| 1600 | "SCIFAPI register: ep %p addr %p len 0x%lx offset 0x%lx prot 0x%x map_flags 0x%x\n", |
| 1601 | epd, addr, len, offset, prot, map_flags); |
| 1602 | /* Unsupported flags */ |
| 1603 | if (map_flags & ~(SCIF_MAP_FIXED | SCIF_MAP_KERNEL)) |
| 1604 | return -EINVAL; |
| 1605 | |
| 1606 | /* |
| 1607 | * Offset is not page aligned/negative or offset+len |
| 1608 | * wraps around with SCIF_MAP_FIXED. |
| 1609 | */ |
| 1610 | if ((map_flags & SCIF_MAP_FIXED) && |
| 1611 | ((ALIGN(offset, PAGE_SIZE) != offset) || |
| 1612 | (offset < 0) || |
| 1613 | (offset + (off_t)len < offset))) |
| 1614 | return -EINVAL; |
| 1615 | |
| 1616 | /* Unsupported protection requested */ |
| 1617 | if (prot & ~(SCIF_PROT_READ | SCIF_PROT_WRITE)) |
| 1618 | return -EINVAL; |
| 1619 | |
| 1620 | /* addr/len must be page aligned. len should be non zero */ |
| 1621 | if (!len || (ALIGN((u64)addr, PAGE_SIZE) != (u64)addr) || |
| 1622 | (ALIGN(len, PAGE_SIZE) != len)) |
| 1623 | return -EINVAL; |
| 1624 | |
| 1625 | might_sleep(); |
| 1626 | |
| 1627 | err = scif_verify_epd(ep); |
| 1628 | if (err) |
| 1629 | return err; |
| 1630 | |
| 1631 | /* Compute the offset for this registration */ |
| 1632 | err = scif_get_window_offset(ep, map_flags, offset, |
| 1633 | len >> PAGE_SHIFT, &computed_offset); |
| 1634 | if (err) |
| 1635 | return err; |
| 1636 | |
| 1637 | spdev = scif_get_peer_dev(ep->remote_dev); |
| 1638 | if (IS_ERR(spdev)) { |
| 1639 | err = PTR_ERR(spdev); |
| 1640 | scif_free_window_offset(ep, NULL, computed_offset); |
| 1641 | return err; |
| 1642 | } |
| 1643 | /* Allocate and prepare self registration window */ |
| 1644 | window = scif_create_window(ep, len >> PAGE_SHIFT, |
| 1645 | computed_offset, false); |
| 1646 | if (!window) { |
| 1647 | scif_free_window_offset(ep, NULL, computed_offset); |
| 1648 | scif_put_peer_dev(spdev); |
| 1649 | return -ENOMEM; |
| 1650 | } |
| 1651 | |
| 1652 | window->nr_pages = len >> PAGE_SHIFT; |
| 1653 | |
| 1654 | err = scif_send_alloc_request(ep, window); |
| 1655 | if (err) { |
| 1656 | scif_destroy_incomplete_window(ep, window); |
| 1657 | scif_put_peer_dev(spdev); |
| 1658 | return err; |
| 1659 | } |
| 1660 | |
| 1661 | if (!(map_flags & SCIF_MAP_KERNEL)) { |
| 1662 | mm = __scif_acquire_mm(); |
| 1663 | map_flags |= SCIF_MAP_ULIMIT; |
| 1664 | } |
| 1665 | /* Pin down the pages */ |
| 1666 | err = __scif_pin_pages(addr, len, &prot, |
| 1667 | map_flags & (SCIF_MAP_KERNEL | SCIF_MAP_ULIMIT), |
| 1668 | &pinned_pages); |
| 1669 | if (err) { |
| 1670 | scif_destroy_incomplete_window(ep, window); |
| 1671 | __scif_release_mm(mm); |
| 1672 | goto error; |
| 1673 | } |
| 1674 | |
| 1675 | window->pinned_pages = pinned_pages; |
| 1676 | window->prot = pinned_pages->prot; |
| 1677 | window->mm = mm; |
| 1678 | |
| 1679 | /* Prepare the remote registration window */ |
| 1680 | err = scif_prep_remote_window(ep, window); |
| 1681 | if (err) { |
| 1682 | dev_err(&ep->remote_dev->sdev->dev, |
| 1683 | "%s %d err %ld\n", __func__, __LINE__, err); |
| 1684 | goto error_unmap; |
| 1685 | } |
| 1686 | |
| 1687 | /* Tell the peer about the new window */ |
| 1688 | err = scif_send_scif_register(ep, window); |
| 1689 | if (err) { |
| 1690 | dev_err(&ep->remote_dev->sdev->dev, |
| 1691 | "%s %d err %ld\n", __func__, __LINE__, err); |
| 1692 | goto error_unmap; |
| 1693 | } |
| 1694 | |
| 1695 | scif_put_peer_dev(spdev); |
| 1696 | /* No further failures expected. Insert new window */ |
| 1697 | scif_insert_local_window(window, ep); |
| 1698 | dev_dbg(&ep->remote_dev->sdev->dev, |
| 1699 | "SCIFAPI register: ep %p addr %p len 0x%lx computed_offset 0x%llx\n", |
| 1700 | epd, addr, len, computed_offset); |
| 1701 | return computed_offset; |
| 1702 | error_unmap: |
| 1703 | scif_destroy_window(ep, window); |
| 1704 | error: |
| 1705 | scif_put_peer_dev(spdev); |
| 1706 | dev_err(&ep->remote_dev->sdev->dev, |
| 1707 | "%s %d err %ld\n", __func__, __LINE__, err); |
| 1708 | return err; |
| 1709 | } |
| 1710 | EXPORT_SYMBOL_GPL(scif_register); |
| 1711 | |
| 1712 | int |
| 1713 | scif_unregister(scif_epd_t epd, off_t offset, size_t len) |
| 1714 | { |
| 1715 | struct scif_endpt *ep = (struct scif_endpt *)epd; |
| 1716 | struct scif_window *window = NULL; |
| 1717 | struct scif_rma_req req; |
| 1718 | int nr_pages, err; |
| 1719 | struct device *spdev; |
| 1720 | |
| 1721 | dev_dbg(scif_info.mdev.this_device, |
| 1722 | "SCIFAPI unregister: ep %p offset 0x%lx len 0x%lx\n", |
| 1723 | ep, offset, len); |
| 1724 | /* len must be page aligned. len should be non zero */ |
| 1725 | if (!len || |
| 1726 | (ALIGN((u64)len, PAGE_SIZE) != (u64)len)) |
| 1727 | return -EINVAL; |
| 1728 | |
| 1729 | /* Offset is not page aligned or offset+len wraps around */ |
| 1730 | if ((ALIGN(offset, PAGE_SIZE) != offset) || |
| 1731 | (offset + (off_t)len < offset)) |
| 1732 | return -EINVAL; |
| 1733 | |
| 1734 | err = scif_verify_epd(ep); |
| 1735 | if (err) |
| 1736 | return err; |
| 1737 | |
| 1738 | might_sleep(); |
| 1739 | nr_pages = len >> PAGE_SHIFT; |
| 1740 | |
| 1741 | req.out_window = &window; |
| 1742 | req.offset = offset; |
| 1743 | req.prot = 0; |
| 1744 | req.nr_bytes = len; |
| 1745 | req.type = SCIF_WINDOW_FULL; |
| 1746 | req.head = &ep->rma_info.reg_list; |
| 1747 | |
| 1748 | spdev = scif_get_peer_dev(ep->remote_dev); |
| 1749 | if (IS_ERR(spdev)) { |
| 1750 | err = PTR_ERR(spdev); |
| 1751 | return err; |
| 1752 | } |
| 1753 | mutex_lock(&ep->rma_info.rma_lock); |
| 1754 | /* Does a valid window exist? */ |
| 1755 | err = scif_query_window(&req); |
| 1756 | if (err) { |
| 1757 | dev_err(&ep->remote_dev->sdev->dev, |
| 1758 | "%s %d err %d\n", __func__, __LINE__, err); |
| 1759 | goto error; |
| 1760 | } |
| 1761 | /* Unregister all the windows in this range */ |
| 1762 | err = scif_rma_list_unregister(window, offset, nr_pages); |
| 1763 | if (err) |
| 1764 | dev_err(&ep->remote_dev->sdev->dev, |
| 1765 | "%s %d err %d\n", __func__, __LINE__, err); |
| 1766 | error: |
| 1767 | mutex_unlock(&ep->rma_info.rma_lock); |
| 1768 | scif_put_peer_dev(spdev); |
| 1769 | return err; |
| 1770 | } |
| 1771 | EXPORT_SYMBOL_GPL(scif_unregister); |