drivers/net/ethernet/ibm/ehea/ehea_qmr.c

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