1 /* 2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #include <linux/slab.h> 35 36 #include "mlx4_ib.h" 37 38 static u32 convert_access(int acc) 39 { 40 return (acc & IB_ACCESS_REMOTE_ATOMIC ? MLX4_PERM_ATOMIC : 0) | 41 (acc & IB_ACCESS_REMOTE_WRITE ? MLX4_PERM_REMOTE_WRITE : 0) | 42 (acc & IB_ACCESS_REMOTE_READ ? MLX4_PERM_REMOTE_READ : 0) | 43 (acc & IB_ACCESS_LOCAL_WRITE ? MLX4_PERM_LOCAL_WRITE : 0) | 44 (acc & IB_ACCESS_MW_BIND ? MLX4_PERM_BIND_MW : 0) | 45 MLX4_PERM_LOCAL_READ; 46 } 47 48 static enum mlx4_mw_type to_mlx4_type(enum ib_mw_type type) 49 { 50 switch (type) { 51 case IB_MW_TYPE_1: return MLX4_MW_TYPE_1; 52 case IB_MW_TYPE_2: return MLX4_MW_TYPE_2; 53 default: return -1; 54 } 55 } 56 57 struct ib_mr *mlx4_ib_get_dma_mr(struct ib_pd *pd, int acc) 58 { 59 struct mlx4_ib_mr *mr; 60 int err; 61 62 mr = kzalloc(sizeof(*mr), GFP_KERNEL); 63 if (!mr) 64 return ERR_PTR(-ENOMEM); 65 66 err = mlx4_mr_alloc(to_mdev(pd->device)->dev, to_mpd(pd)->pdn, 0, 67 ~0ull, convert_access(acc), 0, 0, &mr->mmr); 68 if (err) 69 goto err_free; 70 71 err = mlx4_mr_enable(to_mdev(pd->device)->dev, &mr->mmr); 72 if (err) 73 goto err_mr; 74 75 mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key; 76 mr->umem = NULL; 77 78 return &mr->ibmr; 79 80 err_mr: 81 (void) mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr); 82 83 err_free: 84 kfree(mr); 85 86 return ERR_PTR(err); 87 } 88 89 int mlx4_ib_umem_write_mtt(struct mlx4_ib_dev *dev, struct mlx4_mtt *mtt, 90 struct ib_umem *umem) 91 { 92 u64 *pages; 93 int i, k, entry; 94 int n; 95 int len; 96 int err = 0; 97 struct scatterlist *sg; 98 99 pages = (u64 *) __get_free_page(GFP_KERNEL); 100 if (!pages) 101 return -ENOMEM; 102 103 i = n = 0; 104 105 for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) { 106 len = sg_dma_len(sg) >> mtt->page_shift; 107 for (k = 0; k < len; ++k) { 108 pages[i++] = sg_dma_address(sg) + 109 umem->page_size * k; 110 /* 111 * Be friendly to mlx4_write_mtt() and 112 * pass it chunks of appropriate size. 113 */ 114 if (i == PAGE_SIZE / sizeof (u64)) { 115 err = mlx4_write_mtt(dev->dev, mtt, n, 116 i, pages); 117 if (err) 118 goto out; 119 n += i; 120 i = 0; 121 } 122 } 123 } 124 125 if (i) 126 err = mlx4_write_mtt(dev->dev, mtt, n, i, pages); 127 128 out: 129 free_page((unsigned long) pages); 130 return err; 131 } 132 133 struct ib_mr *mlx4_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length, 134 u64 virt_addr, int access_flags, 135 struct ib_udata *udata) 136 { 137 struct mlx4_ib_dev *dev = to_mdev(pd->device); 138 struct mlx4_ib_mr *mr; 139 int shift; 140 int err; 141 int n; 142 143 mr = kzalloc(sizeof(*mr), GFP_KERNEL); 144 if (!mr) 145 return ERR_PTR(-ENOMEM); 146 147 /* Force registering the memory as writable. */ 148 /* Used for memory re-registeration. HCA protects the access */ 149 mr->umem = ib_umem_get(pd->uobject->context, start, length, 150 access_flags | IB_ACCESS_LOCAL_WRITE, 0); 151 if (IS_ERR(mr->umem)) { 152 err = PTR_ERR(mr->umem); 153 goto err_free; 154 } 155 156 n = ib_umem_page_count(mr->umem); 157 shift = ilog2(mr->umem->page_size); 158 159 err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, virt_addr, length, 160 convert_access(access_flags), n, shift, &mr->mmr); 161 if (err) 162 goto err_umem; 163 164 err = mlx4_ib_umem_write_mtt(dev, &mr->mmr.mtt, mr->umem); 165 if (err) 166 goto err_mr; 167 168 err = mlx4_mr_enable(dev->dev, &mr->mmr); 169 if (err) 170 goto err_mr; 171 172 mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key; 173 174 return &mr->ibmr; 175 176 err_mr: 177 (void) mlx4_mr_free(to_mdev(pd->device)->dev, &mr->mmr); 178 179 err_umem: 180 ib_umem_release(mr->umem); 181 182 err_free: 183 kfree(mr); 184 185 return ERR_PTR(err); 186 } 187 188 int mlx4_ib_rereg_user_mr(struct ib_mr *mr, int flags, 189 u64 start, u64 length, u64 virt_addr, 190 int mr_access_flags, struct ib_pd *pd, 191 struct ib_udata *udata) 192 { 193 struct mlx4_ib_dev *dev = to_mdev(mr->device); 194 struct mlx4_ib_mr *mmr = to_mmr(mr); 195 struct mlx4_mpt_entry *mpt_entry; 196 struct mlx4_mpt_entry **pmpt_entry = &mpt_entry; 197 int err; 198 199 /* Since we synchronize this call and mlx4_ib_dereg_mr via uverbs, 200 * we assume that the calls can't run concurrently. Otherwise, a 201 * race exists. 202 */ 203 err = mlx4_mr_hw_get_mpt(dev->dev, &mmr->mmr, &pmpt_entry); 204 205 if (err) 206 return err; 207 208 if (flags & IB_MR_REREG_PD) { 209 err = mlx4_mr_hw_change_pd(dev->dev, *pmpt_entry, 210 to_mpd(pd)->pdn); 211 212 if (err) 213 goto release_mpt_entry; 214 } 215 216 if (flags & IB_MR_REREG_ACCESS) { 217 err = mlx4_mr_hw_change_access(dev->dev, *pmpt_entry, 218 convert_access(mr_access_flags)); 219 220 if (err) 221 goto release_mpt_entry; 222 } 223 224 if (flags & IB_MR_REREG_TRANS) { 225 int shift; 226 int n; 227 228 mlx4_mr_rereg_mem_cleanup(dev->dev, &mmr->mmr); 229 ib_umem_release(mmr->umem); 230 mmr->umem = ib_umem_get(mr->uobject->context, start, length, 231 mr_access_flags | 232 IB_ACCESS_LOCAL_WRITE, 233 0); 234 if (IS_ERR(mmr->umem)) { 235 err = PTR_ERR(mmr->umem); 236 /* Prevent mlx4_ib_dereg_mr from free'ing invalid pointer */ 237 mmr->umem = NULL; 238 goto release_mpt_entry; 239 } 240 n = ib_umem_page_count(mmr->umem); 241 shift = ilog2(mmr->umem->page_size); 242 243 err = mlx4_mr_rereg_mem_write(dev->dev, &mmr->mmr, 244 virt_addr, length, n, shift, 245 *pmpt_entry); 246 if (err) { 247 ib_umem_release(mmr->umem); 248 goto release_mpt_entry; 249 } 250 mmr->mmr.iova = virt_addr; 251 mmr->mmr.size = length; 252 253 err = mlx4_ib_umem_write_mtt(dev, &mmr->mmr.mtt, mmr->umem); 254 if (err) { 255 mlx4_mr_rereg_mem_cleanup(dev->dev, &mmr->mmr); 256 ib_umem_release(mmr->umem); 257 goto release_mpt_entry; 258 } 259 } 260 261 /* If we couldn't transfer the MR to the HCA, just remember to 262 * return a failure. But dereg_mr will free the resources. 263 */ 264 err = mlx4_mr_hw_write_mpt(dev->dev, &mmr->mmr, pmpt_entry); 265 if (!err && flags & IB_MR_REREG_ACCESS) 266 mmr->mmr.access = mr_access_flags; 267 268 release_mpt_entry: 269 mlx4_mr_hw_put_mpt(dev->dev, pmpt_entry); 270 271 return err; 272 } 273 274 static int 275 mlx4_alloc_priv_pages(struct ib_device *device, 276 struct mlx4_ib_mr *mr, 277 int max_pages) 278 { 279 int size = max_pages * sizeof(u64); 280 int add_size; 281 int ret; 282 283 add_size = max_t(int, MLX4_MR_PAGES_ALIGN - ARCH_KMALLOC_MINALIGN, 0); 284 285 mr->pages_alloc = kzalloc(size + add_size, GFP_KERNEL); 286 if (!mr->pages_alloc) 287 return -ENOMEM; 288 289 mr->pages = PTR_ALIGN(mr->pages_alloc, MLX4_MR_PAGES_ALIGN); 290 291 mr->page_map = dma_map_single(device->dma_device, mr->pages, 292 size, DMA_TO_DEVICE); 293 294 if (dma_mapping_error(device->dma_device, mr->page_map)) { 295 ret = -ENOMEM; 296 goto err; 297 } 298 299 return 0; 300 err: 301 kfree(mr->pages_alloc); 302 303 return ret; 304 } 305 306 static void 307 mlx4_free_priv_pages(struct mlx4_ib_mr *mr) 308 { 309 if (mr->pages) { 310 struct ib_device *device = mr->ibmr.device; 311 int size = mr->max_pages * sizeof(u64); 312 313 dma_unmap_single(device->dma_device, mr->page_map, 314 size, DMA_TO_DEVICE); 315 kfree(mr->pages_alloc); 316 mr->pages = NULL; 317 } 318 } 319 320 int mlx4_ib_dereg_mr(struct ib_mr *ibmr) 321 { 322 struct mlx4_ib_mr *mr = to_mmr(ibmr); 323 int ret; 324 325 mlx4_free_priv_pages(mr); 326 327 ret = mlx4_mr_free(to_mdev(ibmr->device)->dev, &mr->mmr); 328 if (ret) 329 return ret; 330 if (mr->umem) 331 ib_umem_release(mr->umem); 332 kfree(mr); 333 334 return 0; 335 } 336 337 struct ib_mw *mlx4_ib_alloc_mw(struct ib_pd *pd, enum ib_mw_type type) 338 { 339 struct mlx4_ib_dev *dev = to_mdev(pd->device); 340 struct mlx4_ib_mw *mw; 341 int err; 342 343 mw = kmalloc(sizeof(*mw), GFP_KERNEL); 344 if (!mw) 345 return ERR_PTR(-ENOMEM); 346 347 err = mlx4_mw_alloc(dev->dev, to_mpd(pd)->pdn, 348 to_mlx4_type(type), &mw->mmw); 349 if (err) 350 goto err_free; 351 352 err = mlx4_mw_enable(dev->dev, &mw->mmw); 353 if (err) 354 goto err_mw; 355 356 mw->ibmw.rkey = mw->mmw.key; 357 358 return &mw->ibmw; 359 360 err_mw: 361 mlx4_mw_free(dev->dev, &mw->mmw); 362 363 err_free: 364 kfree(mw); 365 366 return ERR_PTR(err); 367 } 368 369 int mlx4_ib_dealloc_mw(struct ib_mw *ibmw) 370 { 371 struct mlx4_ib_mw *mw = to_mmw(ibmw); 372 373 mlx4_mw_free(to_mdev(ibmw->device)->dev, &mw->mmw); 374 kfree(mw); 375 376 return 0; 377 } 378 379 struct ib_mr *mlx4_ib_alloc_mr(struct ib_pd *pd, 380 enum ib_mr_type mr_type, 381 u32 max_num_sg) 382 { 383 struct mlx4_ib_dev *dev = to_mdev(pd->device); 384 struct mlx4_ib_mr *mr; 385 int err; 386 387 if (mr_type != IB_MR_TYPE_MEM_REG || 388 max_num_sg > MLX4_MAX_FAST_REG_PAGES) 389 return ERR_PTR(-EINVAL); 390 391 mr = kzalloc(sizeof(*mr), GFP_KERNEL); 392 if (!mr) 393 return ERR_PTR(-ENOMEM); 394 395 err = mlx4_mr_alloc(dev->dev, to_mpd(pd)->pdn, 0, 0, 0, 396 max_num_sg, 0, &mr->mmr); 397 if (err) 398 goto err_free; 399 400 err = mlx4_alloc_priv_pages(pd->device, mr, max_num_sg); 401 if (err) 402 goto err_free_mr; 403 404 mr->max_pages = max_num_sg; 405 406 err = mlx4_mr_enable(dev->dev, &mr->mmr); 407 if (err) 408 goto err_free_pl; 409 410 mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key; 411 mr->umem = NULL; 412 413 return &mr->ibmr; 414 415 err_free_pl: 416 mlx4_free_priv_pages(mr); 417 err_free_mr: 418 (void) mlx4_mr_free(dev->dev, &mr->mmr); 419 err_free: 420 kfree(mr); 421 return ERR_PTR(err); 422 } 423 424 struct ib_fmr *mlx4_ib_fmr_alloc(struct ib_pd *pd, int acc, 425 struct ib_fmr_attr *fmr_attr) 426 { 427 struct mlx4_ib_dev *dev = to_mdev(pd->device); 428 struct mlx4_ib_fmr *fmr; 429 int err = -ENOMEM; 430 431 fmr = kmalloc(sizeof *fmr, GFP_KERNEL); 432 if (!fmr) 433 return ERR_PTR(-ENOMEM); 434 435 err = mlx4_fmr_alloc(dev->dev, to_mpd(pd)->pdn, convert_access(acc), 436 fmr_attr->max_pages, fmr_attr->max_maps, 437 fmr_attr->page_shift, &fmr->mfmr); 438 if (err) 439 goto err_free; 440 441 err = mlx4_fmr_enable(to_mdev(pd->device)->dev, &fmr->mfmr); 442 if (err) 443 goto err_mr; 444 445 fmr->ibfmr.rkey = fmr->ibfmr.lkey = fmr->mfmr.mr.key; 446 447 return &fmr->ibfmr; 448 449 err_mr: 450 (void) mlx4_mr_free(to_mdev(pd->device)->dev, &fmr->mfmr.mr); 451 452 err_free: 453 kfree(fmr); 454 455 return ERR_PTR(err); 456 } 457 458 int mlx4_ib_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list, 459 int npages, u64 iova) 460 { 461 struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr); 462 struct mlx4_ib_dev *dev = to_mdev(ifmr->ibfmr.device); 463 464 return mlx4_map_phys_fmr(dev->dev, &ifmr->mfmr, page_list, npages, iova, 465 &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey); 466 } 467 468 int mlx4_ib_unmap_fmr(struct list_head *fmr_list) 469 { 470 struct ib_fmr *ibfmr; 471 int err; 472 struct mlx4_dev *mdev = NULL; 473 474 list_for_each_entry(ibfmr, fmr_list, list) { 475 if (mdev && to_mdev(ibfmr->device)->dev != mdev) 476 return -EINVAL; 477 mdev = to_mdev(ibfmr->device)->dev; 478 } 479 480 if (!mdev) 481 return 0; 482 483 list_for_each_entry(ibfmr, fmr_list, list) { 484 struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr); 485 486 mlx4_fmr_unmap(mdev, &ifmr->mfmr, &ifmr->ibfmr.lkey, &ifmr->ibfmr.rkey); 487 } 488 489 /* 490 * Make sure all MPT status updates are visible before issuing 491 * SYNC_TPT firmware command. 492 */ 493 wmb(); 494 495 err = mlx4_SYNC_TPT(mdev); 496 if (err) 497 pr_warn("SYNC_TPT error %d when " 498 "unmapping FMRs\n", err); 499 500 return 0; 501 } 502 503 int mlx4_ib_fmr_dealloc(struct ib_fmr *ibfmr) 504 { 505 struct mlx4_ib_fmr *ifmr = to_mfmr(ibfmr); 506 struct mlx4_ib_dev *dev = to_mdev(ibfmr->device); 507 int err; 508 509 err = mlx4_fmr_free(dev->dev, &ifmr->mfmr); 510 511 if (!err) 512 kfree(ifmr); 513 514 return err; 515 } 516 517 static int mlx4_set_page(struct ib_mr *ibmr, u64 addr) 518 { 519 struct mlx4_ib_mr *mr = to_mmr(ibmr); 520 521 if (unlikely(mr->npages == mr->max_pages)) 522 return -ENOMEM; 523 524 mr->pages[mr->npages++] = cpu_to_be64(addr | MLX4_MTT_FLAG_PRESENT); 525 526 return 0; 527 } 528 529 int mlx4_ib_map_mr_sg(struct ib_mr *ibmr, 530 struct scatterlist *sg, 531 int sg_nents) 532 { 533 struct mlx4_ib_mr *mr = to_mmr(ibmr); 534 int rc; 535 536 mr->npages = 0; 537 538 ib_dma_sync_single_for_cpu(ibmr->device, mr->page_map, 539 sizeof(u64) * mr->max_pages, 540 DMA_TO_DEVICE); 541 542 rc = ib_sg_to_pages(ibmr, sg, sg_nents, mlx4_set_page); 543 544 ib_dma_sync_single_for_device(ibmr->device, mr->page_map, 545 sizeof(u64) * mr->max_pages, 546 DMA_TO_DEVICE); 547 548 return rc; 549 } 550