drivers/net/ehea/ehea_qmr.c

   1 /*
   2  *  linux/drivers/net/ehea/ehea_qmr.c
   3  *
   4  *  eHEA ethernet device driver for IBM eServer System p
   5  *
   6  *  (C) Copyright IBM Corp. 2006
   7  *
   8  *  Authors:
   9  *       Christoph Raisch <raisch@de.ibm.com>
  10  *       Jan-Bernd Themann <themann@de.ibm.com>
  11  *       Thomas Klein <tklein@de.ibm.com>
  12  *
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2, or (at your option)
  17  * any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27  */
  28
  29 #include <linux/mm.h>
  30 #include <linux/slab.h>
  31 #include "ehea.h"
  32 #include "ehea_phyp.h"
  33 #include "ehea_qmr.h"
  34
  35 struct ehea_bmap *ehea_bmap = NULL;
  36
  37
  38
  39 static void *hw_qpageit_get_inc(struct hw_queue *queue)
  40 {
  41         void *retvalue = hw_qeit_get(queue);
  42
  43         queue->current_q_offset += queue->pagesize;
  44         if (queue->current_q_offset > queue->queue_length) {
  45                 queue->current_q_offset -= queue->pagesize;
  46                 retvalue = NULL;
  47         } else if (((u64) retvalue) & (EHEA_PAGESIZE-1)) {
  48                 ehea_error("not on pageboundary");
  49                 retvalue = NULL;
  50         }
  51         return retvalue;
  52 }
  53
  54 static int hw_queue_ctor(struct hw_queue *queue, const u32 nr_of_pages,
  55                           const u32 pagesize, const u32 qe_size)
  56 {
  57         int pages_per_kpage = PAGE_SIZE / pagesize;
  58         int i, k;
  59
  60         if ((pagesize > PAGE_SIZE) || (!pages_per_kpage)) {
  61                 ehea_error("pagesize conflict! kernel pagesize=%d, "
  62                            "ehea pagesize=%d", (int)PAGE_SIZE, (int)pagesize);
  63                 return -EINVAL;
  64         }
  65
  66         queue->queue_length = nr_of_pages * pagesize;
  67         queue->queue_pages = kmalloc(nr_of_pages * sizeof(void *), GFP_KERNEL);
  68         if (!queue->queue_pages) {
  69                 ehea_error("no mem for queue_pages");
  70                 return -ENOMEM;
  71         }
  72
  73         /*
  74          * allocate pages for queue:
  75          * outer loop allocates whole kernel pages (page aligned) and
  76          * inner loop divides a kernel page into smaller hea queue pages
  77          */
  78         i = 0;
  79         while (i < nr_of_pages) {
  80                 u8 *kpage = (u8 *)get_zeroed_page(GFP_KERNEL);
  81                 if (!kpage)
  82                         goto out_nomem;
  83                 for (k = 0; k < pages_per_kpage && i < nr_of_pages; k++) {
  84                         (queue->queue_pages)[i] = (struct ehea_page *)kpage;
  85                         kpage += pagesize;
  86                         i++;
  87                 }
  88         }
  89
  90         queue->current_q_offset = 0;
  91         queue->qe_size = qe_size;
  92         queue->pagesize = pagesize;
  93         queue->toggle_state = 1;
  94
  95         return 0;
  96 out_nomem:
  97         for (i = 0; i < nr_of_pages; i += pages_per_kpage) {
  98                 if (!(queue->queue_pages)[i])
  99                         break;
 100                 free_page((unsigned long)(queue->queue_pages)[i]);
 101         }
 102         return -ENOMEM;
 103 }
 104
 105 static void hw_queue_dtor(struct hw_queue *queue)
 106 {
 107         int pages_per_kpage = PAGE_SIZE / queue->pagesize;
 108         int i, nr_pages;
 109
 110         if (!queue || !queue->queue_pages)
 111                 return;
 112
 113         nr_pages = queue->queue_length / queue->pagesize;
 114
 115         for (i = 0; i < nr_pages; i += pages_per_kpage)
 116                 free_page((unsigned long)(queue->queue_pages)[i]);
 117
 118         kfree(queue->queue_pages);
 119 }
 120
 121 struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter,
 122                                int nr_of_cqe, u64 eq_handle, u32 cq_token)
 123 {
 124         struct ehea_cq *cq;
 125         struct h_epa epa;
 126         u64 *cq_handle_ref, hret, rpage;
 127         u32 act_nr_of_entries, act_pages, counter;
 128         int ret;
 129         void *vpage;
 130
 131         cq = kzalloc(sizeof(*cq), GFP_KERNEL);
 132         if (!cq) {
 133                 ehea_error("no mem for cq");
 134                 goto out_nomem;
 135         }
 136
 137         cq->attr.max_nr_of_cqes = nr_of_cqe;
 138         cq->attr.cq_token = cq_token;
 139         cq->attr.eq_handle = eq_handle;
 140
 141         cq->adapter = adapter;
 142
 143         cq_handle_ref = &cq->fw_handle;
 144         act_nr_of_entries = 0;
 145         act_pages = 0;
 146
 147         hret = ehea_h_alloc_resource_cq(adapter->handle, &cq->attr,
 148                                         &cq->fw_handle, &cq->epas);
 149         if (hret != H_SUCCESS) {
 150                 ehea_error("alloc_resource_cq failed");
 151                 goto out_freemem;
 152         }
 153
 154         ret = hw_queue_ctor(&cq->hw_queue, cq->attr.nr_pages,
 155                             EHEA_PAGESIZE, sizeof(struct ehea_cqe));
 156         if (ret)
 157                 goto out_freeres;
 158
 159         for (counter = 0; counter < cq->attr.nr_pages; counter++) {
 160                 vpage = hw_qpageit_get_inc(&cq->hw_queue);
 161                 if (!vpage) {
 162                         ehea_error("hw_qpageit_get_inc failed");
 163                         goto out_kill_hwq;
 164                 }
 165
 166                 rpage = virt_to_abs(vpage);
 167                 hret = ehea_h_register_rpage(adapter->handle,
 168                                              0, EHEA_CQ_REGISTER_ORIG,
 169                                              cq->fw_handle, rpage, 1);
 170                 if (hret < H_SUCCESS) {
 171                         ehea_error("register_rpage_cq failed ehea_cq=%p "
 172                                    "hret=%llx counter=%i act_pages=%i",
 173                                    cq, hret, counter, cq->attr.nr_pages);
 174                         goto out_kill_hwq;
 175                 }
 176
 177                 if (counter == (cq->attr.nr_pages - 1)) {
 178                         vpage = hw_qpageit_get_inc(&cq->hw_queue);
 179
 180                         if ((hret != H_SUCCESS) || (vpage)) {
 181                                 ehea_error("registration of pages not "
 182                                            "complete hret=%llx\n", hret);
 183                                 goto out_kill_hwq;
 184                         }
 185                 } else {
 186                         if (hret != H_PAGE_REGISTERED) {
 187                                 ehea_error("CQ: registration of page failed "
 188                                            "hret=%llx\n", hret);
 189                                 goto out_kill_hwq;
 190                         }
 191                 }
 192         }
 193
 194         hw_qeit_reset(&cq->hw_queue);
 195         epa = cq->epas.kernel;
 196         ehea_reset_cq_ep(cq);
 197         ehea_reset_cq_n1(cq);
 198
 199         return cq;
 200
 201 out_kill_hwq:
 202         hw_queue_dtor(&cq->hw_queue);
 203
 204 out_freeres:
 205         ehea_h_free_resource(adapter->handle, cq->fw_handle, FORCE_FREE);
 206
 207 out_freemem:
 208         kfree(cq);
 209
 210 out_nomem:
 211         return NULL;
 212 }
 213
 214 u64 ehea_destroy_cq_res(struct ehea_cq *cq, u64 force)
 215 {
 216         u64 hret;
 217         u64 adapter_handle = cq->adapter->handle;
 218
 219         /* deregister all previous registered pages */
 220         hret = ehea_h_free_resource(adapter_handle, cq->fw_handle, force);
 221         if (hret != H_SUCCESS)
 222                 return hret;
 223
 224         hw_queue_dtor(&cq->hw_queue);
 225         kfree(cq);
 226
 227         return hret;
 228 }
 229
 230 int ehea_destroy_cq(struct ehea_cq *cq)
 231 {
 232         u64 hret;
 233         if (!cq)
 234                 return 0;
 235
 236         hcp_epas_dtor(&cq->epas);
 237         hret = ehea_destroy_cq_res(cq, NORMAL_FREE);
 238         if (hret == H_R_STATE) {
 239                 ehea_error_data(cq->adapter, cq->fw_handle);
 240                 hret = ehea_destroy_cq_res(cq, FORCE_FREE);
 241         }
 242
 243         if (hret != H_SUCCESS) {
 244                 ehea_error("destroy CQ failed");
 245                 return -EIO;
 246         }
 247
 248         return 0;
 249 }
 250
 251 struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
 252                                const enum ehea_eq_type type,
 253                                const u32 max_nr_of_eqes, const u8 eqe_gen)
 254 {
 255         int ret, i;
 256         u64 hret, rpage;
 257         void *vpage;
 258         struct ehea_eq *eq;
 259
 260         eq = kzalloc(sizeof(*eq), GFP_KERNEL);
 261         if (!eq) {
 262                 ehea_error("no mem for eq");
 263                 return NULL;
 264         }
 265
 266         eq->adapter = adapter;
 267         eq->attr.type = type;
 268         eq->attr.max_nr_of_eqes = max_nr_of_eqes;
 269         eq->attr.eqe_gen = eqe_gen;
 270         spin_lock_init(&eq->spinlock);
 271
 272         hret = ehea_h_alloc_resource_eq(adapter->handle,
 273                                         &eq->attr, &eq->fw_handle);
 274         if (hret != H_SUCCESS) {
 275                 ehea_error("alloc_resource_eq failed");
 276                 goto out_freemem;
 277         }
 278
 279         ret = hw_queue_ctor(&eq->hw_queue, eq->attr.nr_pages,
 280                             EHEA_PAGESIZE, sizeof(struct ehea_eqe));
 281         if (ret) {
 282                 ehea_error("can't allocate eq pages");
 283                 goto out_freeres;
 284         }
 285
 286         for (i = 0; i < eq->attr.nr_pages; i++) {
 287                 vpage = hw_qpageit_get_inc(&eq->hw_queue);
 288                 if (!vpage) {
 289                         ehea_error("hw_qpageit_get_inc failed");
 290                         hret = H_RESOURCE;
 291                         goto out_kill_hwq;
 292                 }
 293
 294                 rpage = virt_to_abs(vpage);
 295
 296                 hret = ehea_h_register_rpage(adapter->handle, 0,
 297                                              EHEA_EQ_REGISTER_ORIG,
 298                                              eq->fw_handle, rpage, 1);
 299
 300                 if (i == (eq->attr.nr_pages - 1)) {
 301                         /* last page */
 302                         vpage = hw_qpageit_get_inc(&eq->hw_queue);
 303                         if ((hret != H_SUCCESS) || (vpage))
 304                                 goto out_kill_hwq;
 305
 306                 } else {
 307                         if (hret != H_PAGE_REGISTERED)
 308                                 goto out_kill_hwq;
 309
 310                 }
 311         }
 312
 313         hw_qeit_reset(&eq->hw_queue);
 314         return eq;
 315
 316 out_kill_hwq:
 317         hw_queue_dtor(&eq->hw_queue);
 318
 319 out_freeres:
 320         ehea_h_free_resource(adapter->handle, eq->fw_handle, FORCE_FREE);
 321
 322 out_freemem:
 323         kfree(eq);
 324         return NULL;
 325 }
 326
 327 struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq)
 328 {
 329         struct ehea_eqe *eqe;
 330         unsigned long flags;
 331
 332         spin_lock_irqsave(&eq->spinlock, flags);
 333         eqe = (struct ehea_eqe *)hw_eqit_eq_get_inc_valid(&eq->hw_queue);
 334         spin_unlock_irqrestore(&eq->spinlock, flags);
 335
 336         return eqe;
 337 }
 338
 339 u64 ehea_destroy_eq_res(struct ehea_eq *eq, u64 force)
 340 {
 341         u64 hret;
 342         unsigned long flags;
 343
 344         spin_lock_irqsave(&eq->spinlock, flags);
 345
 346         hret = ehea_h_free_resource(eq->adapter->handle, eq->fw_handle, force);
 347         spin_unlock_irqrestore(&eq->spinlock, flags);
 348
 349         if (hret != H_SUCCESS)
 350                 return hret;
 351
 352         hw_queue_dtor(&eq->hw_queue);
 353         kfree(eq);
 354
 355         return hret;
 356 }
 357
 358 int ehea_destroy_eq(struct ehea_eq *eq)
 359 {
 360         u64 hret;
 361         if (!eq)
 362                 return 0;
 363
 364         hcp_epas_dtor(&eq->epas);
 365
 366         hret = ehea_destroy_eq_res(eq, NORMAL_FREE);
 367         if (hret == H_R_STATE) {
 368                 ehea_error_data(eq->adapter, eq->fw_handle);
 369                 hret = ehea_destroy_eq_res(eq, FORCE_FREE);
 370         }
 371
 372         if (hret != H_SUCCESS) {
 373                 ehea_error("destroy EQ failed");
 374                 return -EIO;
 375         }
 376
 377         return 0;
 378 }
 379
 380 /**
 381  * allocates memory for a queue and registers pages in phyp
 382  */
 383 int ehea_qp_alloc_register(struct ehea_qp *qp, struct hw_queue *hw_queue,
 384                            int nr_pages, int wqe_size, int act_nr_sges,
 385                            struct ehea_adapter *adapter, int h_call_q_selector)
 386 {
 387         u64 hret, rpage;
 388         int ret, cnt;
 389         void *vpage;
 390
 391         ret = hw_queue_ctor(hw_queue, nr_pages, EHEA_PAGESIZE, wqe_size);
 392         if (ret)
 393                 return ret;
 394
 395         for (cnt = 0; cnt < nr_pages; cnt++) {
 396                 vpage = hw_qpageit_get_inc(hw_queue);
 397                 if (!vpage) {
 398                         ehea_error("hw_qpageit_get_inc failed");
 399                         goto out_kill_hwq;
 400                 }
 401                 rpage = virt_to_abs(vpage);
 402                 hret = ehea_h_register_rpage(adapter->handle,
 403                                              0, h_call_q_selector,
 404                                              qp->fw_handle, rpage, 1);
 405                 if (hret < H_SUCCESS) {
 406                         ehea_error("register_rpage_qp failed");
 407                         goto out_kill_hwq;
 408                 }
 409         }
 410         hw_qeit_reset(hw_queue);
 411         return 0;
 412
 413 out_kill_hwq:
 414         hw_queue_dtor(hw_queue);
 415         return -EIO;
 416 }
 417
 418 static inline u32 map_wqe_size(u8 wqe_enc_size)
 419 {
 420         return 128 << wqe_enc_size;
 421 }
 422
 423 struct ehea_qp *ehea_create_qp(struct ehea_adapter *adapter,
 424                                u32 pd, struct ehea_qp_init_attr *init_attr)
 425 {
 426         int ret;
 427         u64 hret;
 428         struct ehea_qp *qp;
 429         u32 wqe_size_in_bytes_sq, wqe_size_in_bytes_rq1;
 430         u32 wqe_size_in_bytes_rq2, wqe_size_in_bytes_rq3;
 431
 432
 433         qp = kzalloc(sizeof(*qp), GFP_KERNEL);
 434         if (!qp) {
 435                 ehea_error("no mem for qp");
 436                 return NULL;
 437         }
 438
 439         qp->adapter = adapter;
 440
 441         hret = ehea_h_alloc_resource_qp(adapter->handle, init_attr, pd,
 442                                         &qp->fw_handle, &qp->epas);
 443         if (hret != H_SUCCESS) {
 444                 ehea_error("ehea_h_alloc_resource_qp failed");
 445                 goto out_freemem;
 446         }
 447
 448         wqe_size_in_bytes_sq = map_wqe_size(init_attr->act_wqe_size_enc_sq);
 449         wqe_size_in_bytes_rq1 = map_wqe_size(init_attr->act_wqe_size_enc_rq1);
 450         wqe_size_in_bytes_rq2 = map_wqe_size(init_attr->act_wqe_size_enc_rq2);
 451         wqe_size_in_bytes_rq3 = map_wqe_size(init_attr->act_wqe_size_enc_rq3);
 452
 453         ret = ehea_qp_alloc_register(qp, &qp->hw_squeue, init_attr->nr_sq_pages,
 454                                      wqe_size_in_bytes_sq,
 455                                      init_attr->act_wqe_size_enc_sq, adapter,
 456                                      0);
 457         if (ret) {
 458                 ehea_error("can't register for sq ret=%x", ret);
 459                 goto out_freeres;
 460         }
 461
 462         ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue1,
 463                                      init_attr->nr_rq1_pages,
 464                                      wqe_size_in_bytes_rq1,
 465                                      init_attr->act_wqe_size_enc_rq1,
 466                                      adapter, 1);
 467         if (ret) {
 468                 ehea_error("can't register for rq1 ret=%x", ret);
 469                 goto out_kill_hwsq;
 470         }
 471
 472         if (init_attr->rq_count > 1) {
 473                 ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue2,
 474                                              init_attr->nr_rq2_pages,
 475                                              wqe_size_in_bytes_rq2,
 476                                              init_attr->act_wqe_size_enc_rq2,
 477                                              adapter, 2);
 478                 if (ret) {
 479                         ehea_error("can't register for rq2 ret=%x", ret);
 480                         goto out_kill_hwr1q;
 481                 }
 482         }
 483
 484         if (init_attr->rq_count > 2) {
 485                 ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue3,
 486                                              init_attr->nr_rq3_pages,
 487                                              wqe_size_in_bytes_rq3,
 488                                              init_attr->act_wqe_size_enc_rq3,
 489                                              adapter, 3);
 490                 if (ret) {
 491                         ehea_error("can't register for rq3 ret=%x", ret);
 492                         goto out_kill_hwr2q;
 493                 }
 494         }
 495
 496         qp->init_attr = *init_attr;
 497
 498         return qp;
 499
 500 out_kill_hwr2q:
 501         hw_queue_dtor(&qp->hw_rqueue2);
 502
 503 out_kill_hwr1q:
 504         hw_queue_dtor(&qp->hw_rqueue1);
 505
 506 out_kill_hwsq:
 507         hw_queue_dtor(&qp->hw_squeue);
 508
 509 out_freeres:
 510         ehea_h_disable_and_get_hea(adapter->handle, qp->fw_handle);
 511         ehea_h_free_resource(adapter->handle, qp->fw_handle, FORCE_FREE);
 512
 513 out_freemem:
 514         kfree(qp);
 515         return NULL;
 516 }
 517
 518 u64 ehea_destroy_qp_res(struct ehea_qp *qp, u64 force)
 519 {
 520         u64 hret;
 521         struct ehea_qp_init_attr *qp_attr = &qp->init_attr;
 522
 523
 524         ehea_h_disable_and_get_hea(qp->adapter->handle, qp->fw_handle);
 525         hret = ehea_h_free_resource(qp->adapter->handle, qp->fw_handle, force);
 526         if (hret != H_SUCCESS)
 527                 return hret;
 528
 529         hw_queue_dtor(&qp->hw_squeue);
 530         hw_queue_dtor(&qp->hw_rqueue1);
 531
 532         if (qp_attr->rq_count > 1)
 533                 hw_queue_dtor(&qp->hw_rqueue2);
 534         if (qp_attr->rq_count > 2)
 535                 hw_queue_dtor(&qp->hw_rqueue3);
 536         kfree(qp);
 537
 538         return hret;
 539 }
 540
 541 int ehea_destroy_qp(struct ehea_qp *qp)
 542 {
 543         u64 hret;
 544         if (!qp)
 545                 return 0;
 546
 547         hcp_epas_dtor(&qp->epas);
 548
 549         hret = ehea_destroy_qp_res(qp, NORMAL_FREE);
 550         if (hret == H_R_STATE) {
 551                 ehea_error_data(qp->adapter, qp->fw_handle);
 552                 hret = ehea_destroy_qp_res(qp, FORCE_FREE);
 553         }
 554
 555         if (hret != H_SUCCESS) {
 556                 ehea_error("destroy QP failed");
 557                 return -EIO;
 558         }
 559
 560         return 0;
 561 }
 562
 563 static inline int ehea_calc_index(unsigned long i, unsigned long s)
 564 {
 565         return (i >> s) & EHEA_INDEX_MASK;
 566 }
 567
 568 static inline int ehea_init_top_bmap(struct ehea_top_bmap *ehea_top_bmap,
 569                                      int dir)
 570 {
 571         if (!ehea_top_bmap->dir[dir]) {
 572                 ehea_top_bmap->dir[dir] =
 573                         kzalloc(sizeof(struct ehea_dir_bmap), GFP_KERNEL);
 574                 if (!ehea_top_bmap->dir[dir])
 575                         return -ENOMEM;
 576         }
 577         return 0;
 578 }
 579
 580 static inline int ehea_init_bmap(struct ehea_bmap *ehea_bmap, int top, int dir)
 581 {
 582         if (!ehea_bmap->top[top]) {
 583                 ehea_bmap->top[top] =
 584                         kzalloc(sizeof(struct ehea_top_bmap), GFP_KERNEL);
 585                 if (!ehea_bmap->top[top])
 586                         return -ENOMEM;
 587         }
 588         return ehea_init_top_bmap(ehea_bmap->top[top], dir);
 589 }
 590
 591 static DEFINE_MUTEX(ehea_busmap_mutex);
 592 static unsigned long ehea_mr_len;
 593
 594 #define EHEA_BUSMAP_ADD_SECT 1
 595 #define EHEA_BUSMAP_REM_SECT 0
 596
 597 static void ehea_rebuild_busmap(void)
 598 {
 599         u64 vaddr = EHEA_BUSMAP_START;
 600         int top, dir, idx;
 601
 602         for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
 603                 struct ehea_top_bmap *ehea_top;
 604                 int valid_dir_entries = 0;
 605
 606                 if (!ehea_bmap->top[top])
 607                         continue;
 608                 ehea_top = ehea_bmap->top[top];
 609                 for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
 610                         struct ehea_dir_bmap *ehea_dir;
 611                         int valid_entries = 0;
 612
 613                         if (!ehea_top->dir[dir])
 614                                 continue;
 615                         valid_dir_entries++;
 616                         ehea_dir = ehea_top->dir[dir];
 617                         for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
 618                                 if (!ehea_dir->ent[idx])
 619                                         continue;
 620                                 valid_entries++;
 621                                 ehea_dir->ent[idx] = vaddr;
 622                                 vaddr += EHEA_SECTSIZE;
 623                         }
 624                         if (!valid_entries) {
 625                                 ehea_top->dir[dir] = NULL;
 626                                 kfree(ehea_dir);
 627                         }
 628                 }
 629                 if (!valid_dir_entries) {
 630                         ehea_bmap->top[top] = NULL;
 631                         kfree(ehea_top);
 632                 }
 633         }
 634 }
 635
 636 static int ehea_update_busmap(unsigned long pfn, unsigned long nr_pages, int add)
 637 {
 638         unsigned long i, start_section, end_section;
 639
 640         if (!nr_pages)
 641                 return 0;
 642
 643         if (!ehea_bmap) {
 644                 ehea_bmap = kzalloc(sizeof(struct ehea_bmap), GFP_KERNEL);
 645                 if (!ehea_bmap)
 646                         return -ENOMEM;
 647         }
 648
 649         start_section = (pfn * PAGE_SIZE) / EHEA_SECTSIZE;
 650         end_section = start_section + ((nr_pages * PAGE_SIZE) / EHEA_SECTSIZE);
 651         /* Mark entries as valid or invalid only; address is assigned later */
 652         for (i = start_section; i < end_section; i++) {
 653                 u64 flag;
 654                 int top = ehea_calc_index(i, EHEA_TOP_INDEX_SHIFT);
 655                 int dir = ehea_calc_index(i, EHEA_DIR_INDEX_SHIFT);
 656                 int idx = i & EHEA_INDEX_MASK;
 657
 658                 if (add) {
 659                         int ret = ehea_init_bmap(ehea_bmap, top, dir);
 660                         if (ret)
 661                                 return ret;
 662                         flag = 1; /* valid */
 663                         ehea_mr_len += EHEA_SECTSIZE;
 664                 } else {
 665                         if (!ehea_bmap->top[top])
 666                                 continue;
 667                         if (!ehea_bmap->top[top]->dir[dir])
 668                                 continue;
 669                         flag = 0; /* invalid */
 670                         ehea_mr_len -= EHEA_SECTSIZE;
 671                 }
 672
 673                 ehea_bmap->top[top]->dir[dir]->ent[idx] = flag;
 674         }
 675         ehea_rebuild_busmap(); /* Assign contiguous addresses for mr */
 676         return 0;
 677 }
 678
 679 int ehea_add_sect_bmap(unsigned long pfn, unsigned long nr_pages)
 680 {
 681         int ret;
 682
 683         mutex_lock(&ehea_busmap_mutex);
 684         ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
 685         mutex_unlock(&ehea_busmap_mutex);
 686         return ret;
 687 }
 688
 689 int ehea_rem_sect_bmap(unsigned long pfn, unsigned long nr_pages)
 690 {
 691         int ret;
 692
 693         mutex_lock(&ehea_busmap_mutex);
 694         ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_REM_SECT);
 695         mutex_unlock(&ehea_busmap_mutex);
 696         return ret;
 697 }
 698
 699 static int ehea_is_hugepage(unsigned long pfn)
 700 {
 701         int page_order;
 702
 703         if (pfn & EHEA_HUGEPAGE_PFN_MASK)
 704                 return 0;
 705
 706         page_order = compound_order(pfn_to_page(pfn));
 707         if (page_order + PAGE_SHIFT != EHEA_HUGEPAGESHIFT)
 708                 return 0;
 709
 710         return 1;
 711 }
 712
 713 static int ehea_create_busmap_callback(unsigned long initial_pfn,
 714                                        unsigned long total_nr_pages, void *arg)
 715 {
 716         int ret;
 717         unsigned long pfn, start_pfn, end_pfn, nr_pages;
 718
 719         if ((total_nr_pages * PAGE_SIZE) < EHEA_HUGEPAGE_SIZE)
 720                 return ehea_update_busmap(initial_pfn, total_nr_pages,
 721                                           EHEA_BUSMAP_ADD_SECT);
 722
 723         /* Given chunk is >= 16GB -> check for hugepages */
 724         start_pfn = initial_pfn;
 725         end_pfn = initial_pfn + total_nr_pages;
 726         pfn = start_pfn;
 727
 728         while (pfn < end_pfn) {
 729                 if (ehea_is_hugepage(pfn)) {
 730                         /* Add mem found in front of the hugepage */
 731                         nr_pages = pfn - start_pfn;
 732                         ret = ehea_update_busmap(start_pfn, nr_pages,
 733                                                  EHEA_BUSMAP_ADD_SECT);
 734                         if (ret)
 735                                 return ret;
 736
 737                         /* Skip the hugepage */
 738                         pfn += (EHEA_HUGEPAGE_SIZE / PAGE_SIZE);
 739                         start_pfn = pfn;
 740                 } else
 741                         pfn += (EHEA_SECTSIZE / PAGE_SIZE);
 742         }
 743
 744         /* Add mem found behind the hugepage(s)  */
 745         nr_pages = pfn - start_pfn;
 746         return ehea_update_busmap(start_pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
 747 }
 748
 749 int ehea_create_busmap(void)
 750 {
 751         int ret;
 752
 753         mutex_lock(&ehea_busmap_mutex);
 754         ehea_mr_len = 0;
 755         ret = walk_system_ram_range(0, 1ULL << MAX_PHYSMEM_BITS, NULL,
 756                                    ehea_create_busmap_callback);
 757         mutex_unlock(&ehea_busmap_mutex);
 758         return ret;
 759 }
 760
 761 void ehea_destroy_busmap(void)
 762 {
 763         int top, dir;
 764         mutex_lock(&ehea_busmap_mutex);
 765         if (!ehea_bmap)
 766                 goto out_destroy;
 767
 768         for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
 769                 if (!ehea_bmap->top[top])
 770                         continue;
 771
 772                 for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
 773                         if (!ehea_bmap->top[top]->dir[dir])
 774                                 continue;
 775
 776                         kfree(ehea_bmap->top[top]->dir[dir]);
 777                 }
 778
 779                 kfree(ehea_bmap->top[top]);
 780         }
 781
 782         kfree(ehea_bmap);
 783         ehea_bmap = NULL;
 784 out_destroy:
 785         mutex_unlock(&ehea_busmap_mutex);
 786 }
 787
 788 u64 ehea_map_vaddr(void *caddr)
 789 {
 790         int top, dir, idx;
 791         unsigned long index, offset;
 792
 793         if (!ehea_bmap)
 794                 return EHEA_INVAL_ADDR;
 795
 796         index = virt_to_abs(caddr) >> SECTION_SIZE_BITS;
 797         top = (index >> EHEA_TOP_INDEX_SHIFT) & EHEA_INDEX_MASK;
 798         if (!ehea_bmap->top[top])
 799                 return EHEA_INVAL_ADDR;
 800
 801         dir = (index >> EHEA_DIR_INDEX_SHIFT) & EHEA_INDEX_MASK;
 802         if (!ehea_bmap->top[top]->dir[dir])
 803                 return EHEA_INVAL_ADDR;
 804
 805         idx = index & EHEA_INDEX_MASK;
 806         if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
 807                 return EHEA_INVAL_ADDR;
 808
 809         offset = (unsigned long)caddr & (EHEA_SECTSIZE - 1);
 810         return ehea_bmap->top[top]->dir[dir]->ent[idx] | offset;
 811 }
 812
 813 static inline void *ehea_calc_sectbase(int top, int dir, int idx)
 814 {
 815         unsigned long ret = idx;
 816         ret |= dir << EHEA_DIR_INDEX_SHIFT;
 817         ret |= top << EHEA_TOP_INDEX_SHIFT;
 818         return abs_to_virt(ret << SECTION_SIZE_BITS);
 819 }
 820
 821 static u64 ehea_reg_mr_section(int top, int dir, int idx, u64 *pt,
 822                                struct ehea_adapter *adapter,
 823                                struct ehea_mr *mr)
 824 {
 825         void *pg;
 826         u64 j, m, hret;
 827         unsigned long k = 0;
 828         u64 pt_abs = virt_to_abs(pt);
 829
 830         void *sectbase = ehea_calc_sectbase(top, dir, idx);
 831
 832         for (j = 0; j < (EHEA_PAGES_PER_SECTION / EHEA_MAX_RPAGE); j++) {
 833
 834                 for (m = 0; m < EHEA_MAX_RPAGE; m++) {
 835                         pg = sectbase + ((k++) * EHEA_PAGESIZE);
 836                         pt[m] = virt_to_abs(pg);
 837                 }
 838                 hret = ehea_h_register_rpage_mr(adapter->handle, mr->handle, 0,
 839                                                 0, pt_abs, EHEA_MAX_RPAGE);
 840
 841                 if ((hret != H_SUCCESS) &&
 842                     (hret != H_PAGE_REGISTERED)) {
 843                         ehea_h_free_resource(adapter->handle, mr->handle,
 844                                              FORCE_FREE);
 845                         ehea_error("register_rpage_mr failed");
 846                         return hret;
 847                 }
 848         }
 849         return hret;
 850 }
 851
 852 static u64 ehea_reg_mr_sections(int top, int dir, u64 *pt,
 853                                 struct ehea_adapter *adapter,
 854                                 struct ehea_mr *mr)
 855 {
 856         u64 hret = H_SUCCESS;
 857         int idx;
 858
 859         for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
 860                 if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
 861                         continue;
 862
 863                 hret = ehea_reg_mr_section(top, dir, idx, pt, adapter, mr);
 864                 if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
 865                         return hret;
 866         }
 867         return hret;
 868 }
 869
 870 static u64 ehea_reg_mr_dir_sections(int top, u64 *pt,
 871                                     struct ehea_adapter *adapter,
 872                                     struct ehea_mr *mr)
 873 {
 874         u64 hret = H_SUCCESS;
 875         int dir;
 876
 877         for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
 878                 if (!ehea_bmap->top[top]->dir[dir])
 879                         continue;
 880
 881                 hret = ehea_reg_mr_sections(top, dir, pt, adapter, mr);
 882                 if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
 883                         return hret;
 884         }
 885         return hret;
 886 }
 887
 888 int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr)
 889 {
 890         int ret;
 891         u64 *pt;
 892         u64 hret;
 893         u32 acc_ctrl = EHEA_MR_ACC_CTRL;
 894
 895         unsigned long top;
 896
 897         pt = (void *)get_zeroed_page(GFP_KERNEL);
 898         if (!pt) {
 899                 ehea_error("no mem");
 900                 ret = -ENOMEM;
 901                 goto out;
 902         }
 903
 904         hret = ehea_h_alloc_resource_mr(adapter->handle, EHEA_BUSMAP_START,
 905                                         ehea_mr_len, acc_ctrl, adapter->pd,
 906                                         &mr->handle, &mr->lkey);
 907
 908         if (hret != H_SUCCESS) {
 909                 ehea_error("alloc_resource_mr failed");
 910                 ret = -EIO;
 911                 goto out;
 912         }
 913
 914         if (!ehea_bmap) {
 915                 ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);
 916                 ehea_error("no busmap available");
 917                 ret = -EIO;
 918                 goto out;
 919         }
 920
 921         for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
 922                 if (!ehea_bmap->top[top])
 923                         continue;
 924
 925                 hret = ehea_reg_mr_dir_sections(top, pt, adapter, mr);
 926                 if((hret != H_PAGE_REGISTERED) && (hret != H_SUCCESS))
 927                         break;
 928         }
 929
 930         if (hret != H_SUCCESS) {
 931                 ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);
 932                 ehea_error("registering mr failed");
 933                 ret = -EIO;
 934                 goto out;
 935         }
 936
 937         mr->vaddr = EHEA_BUSMAP_START;
 938         mr->adapter = adapter;
 939         ret = 0;
 940 out:
 941         free_page((unsigned long)pt);
 942         return ret;
 943 }
 944
 945 int ehea_rem_mr(struct ehea_mr *mr)
 946 {
 947         u64 hret;
 948
 949         if (!mr || !mr->adapter)
 950                 return -EINVAL;
 951
 952         hret = ehea_h_free_resource(mr->adapter->handle, mr->handle,
 953                                     FORCE_FREE);
 954         if (hret != H_SUCCESS) {
 955                 ehea_error("destroy MR failed");
 956                 return -EIO;
 957         }
 958
 959         return 0;
 960 }
 961
 962 int ehea_gen_smr(struct ehea_adapter *adapter, struct ehea_mr *old_mr,
 963                  struct ehea_mr *shared_mr)
 964 {
 965         u64 hret;
 966
 967         hret = ehea_h_register_smr(adapter->handle, old_mr->handle,
 968                                    old_mr->vaddr, EHEA_MR_ACC_CTRL,
 969                                    adapter->pd, shared_mr);
 970         if (hret != H_SUCCESS)
 971                 return -EIO;
 972
 973         shared_mr->adapter = adapter;
 974
 975         return 0;
 976 }
 977
 978 void print_error_data(u64 *data)
 979 {
 980         int length;
 981         u64 type = EHEA_BMASK_GET(ERROR_DATA_TYPE, data[2]);
 982         u64 resource = data[1];
 983
 984         length = EHEA_BMASK_GET(ERROR_DATA_LENGTH, data[0]);
 985
 986         if (length > EHEA_PAGESIZE)
 987                 length = EHEA_PAGESIZE;
 988
 989         if (type == 0x8) /* Queue Pair */
 990                 ehea_error("QP (resource=%llX) state: AER=0x%llX, AERR=0x%llX, "
 991                            "port=%llX", resource, data[6], data[12], data[22]);
 992
 993         if (type == 0x4) /* Completion Queue */
 994                 ehea_error("CQ (resource=%llX) state: AER=0x%llX", resource,
 995                            data[6]);
 996
 997         if (type == 0x3) /* Event Queue */
 998                 ehea_error("EQ (resource=%llX) state: AER=0x%llX", resource,
 999                            data[6]);
1000
1001         ehea_dump(data, length, "error data");
1002 }
1003
1004 void ehea_error_data(struct ehea_adapter *adapter, u64 res_handle)
1005 {
1006         unsigned long ret;
1007         u64 *rblock;
1008
1009         rblock = (void *)get_zeroed_page(GFP_KERNEL);
1010         if (!rblock) {
1011                 ehea_error("Cannot allocate rblock memory.");
1012                 return;
1013         }
1014
1015         ret = ehea_h_error_data(adapter->handle,
1016                                 res_handle,
1017                                 rblock);
1018
1019         if (ret == H_R_STATE)
1020                 ehea_error("No error data is available: %llX.", res_handle);
1021         else if (ret == H_SUCCESS)
1022                 print_error_data(rblock);
1023         else
1024                 ehea_error("Error data could not be fetched: %llX", res_handle);
1025
1026         free_page((unsigned long)rblock);
1027 }