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   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 "ehea.h"
  30 #include "ehea_phyp.h"
  31 #include "ehea_qmr.h"
  32
  33 static void *hw_qpageit_get_inc(struct hw_queue *queue)
  34 {
  35         void *retvalue = hw_qeit_get(queue);
  36
  37         queue->current_q_offset += queue->pagesize;
  38         if (queue->current_q_offset > queue->queue_length) {
  39                 queue->current_q_offset -= queue->pagesize;
  40                 retvalue = NULL;
  41         } else if (((u64) retvalue) & (EHEA_PAGESIZE-1)) {
  42                 ehea_error("not on pageboundary");
  43                 retvalue = NULL;
  44         }
  45         return retvalue;
  46 }
  47
  48 static int hw_queue_ctor(struct hw_queue *queue, const u32 nr_of_pages,
  49                           const u32 pagesize, const u32 qe_size)
  50 {
  51         int pages_per_kpage = PAGE_SIZE / pagesize;
  52         int i, k;
  53
  54         if ((pagesize > PAGE_SIZE) || (!pages_per_kpage)) {
  55                 ehea_error("pagesize conflict! kernel pagesize=%d, "
  56                            "ehea pagesize=%d", (int)PAGE_SIZE, (int)pagesize);
  57                 return -EINVAL;
  58         }
  59
  60         queue->queue_length = nr_of_pages * pagesize;
  61         queue->queue_pages = kmalloc(nr_of_pages * sizeof(void*), GFP_KERNEL);
  62         if (!queue->queue_pages) {
  63                 ehea_error("no mem for queue_pages");
  64                 return -ENOMEM;
  65         }
  66
  67         /*
  68          * allocate pages for queue:
  69          * outer loop allocates whole kernel pages (page aligned) and
  70          * inner loop divides a kernel page into smaller hea queue pages
  71          */
  72         i = 0;
  73         while (i < nr_of_pages) {
  74                 u8 *kpage = (u8*)get_zeroed_page(GFP_KERNEL);
  75                 if (!kpage)
  76                         goto out_nomem;
  77                 for (k = 0; k < pages_per_kpage && i < nr_of_pages; k++) {
  78                         (queue->queue_pages)[i] = (struct ehea_page*)kpage;
  79                         kpage += pagesize;
  80                         i++;
  81                 }
  82         }
  83
  84         queue->current_q_offset = 0;
  85         queue->qe_size = qe_size;
  86         queue->pagesize = pagesize;
  87         queue->toggle_state = 1;
  88
  89         return 0;
  90 out_nomem:
  91         for (i = 0; i < nr_of_pages; i += pages_per_kpage) {
  92                 if (!(queue->queue_pages)[i])
  93                         break;
  94                 free_page((unsigned long)(queue->queue_pages)[i]);
  95         }
  96         return -ENOMEM;
  97 }
  98
  99 static void hw_queue_dtor(struct hw_queue *queue)
 100 {
 101         int pages_per_kpage = PAGE_SIZE / queue->pagesize;
 102         int i, nr_pages;
 103
 104         if (!queue || !queue->queue_pages)
 105                 return;
 106
 107         nr_pages = queue->queue_length / queue->pagesize;
 108
 109         for (i = 0; i < nr_pages; i += pages_per_kpage)
 110                 free_page((unsigned long)(queue->queue_pages)[i]);
 111
 112         kfree(queue->queue_pages);
 113 }
 114
 115 struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter,
 116                                int nr_of_cqe, u64 eq_handle, u32 cq_token)
 117 {
 118         struct ehea_cq *cq;
 119         struct h_epa epa;
 120         u64 *cq_handle_ref, hret, rpage;
 121         u32 act_nr_of_entries, act_pages, counter;
 122         int ret;
 123         void *vpage;
 124
 125         cq = kzalloc(sizeof(*cq), GFP_KERNEL);
 126         if (!cq) {
 127                 ehea_error("no mem for cq");
 128                 goto out_nomem;
 129         }
 130
 131         cq->attr.max_nr_of_cqes = nr_of_cqe;
 132         cq->attr.cq_token = cq_token;
 133         cq->attr.eq_handle = eq_handle;
 134
 135         cq->adapter = adapter;
 136
 137         cq_handle_ref = &cq->fw_handle;
 138         act_nr_of_entries = 0;
 139         act_pages = 0;
 140
 141         hret = ehea_h_alloc_resource_cq(adapter->handle, &cq->attr,
 142                                         &cq->fw_handle, &cq->epas);
 143         if (hret != H_SUCCESS) {
 144                 ehea_error("alloc_resource_cq failed");
 145                 goto out_freemem;
 146         }
 147
 148         ret = hw_queue_ctor(&cq->hw_queue, cq->attr.nr_pages,
 149                             EHEA_PAGESIZE, sizeof(struct ehea_cqe));
 150         if (ret)
 151                 goto out_freeres;
 152
 153         for (counter = 0; counter < cq->attr.nr_pages; counter++) {
 154                 vpage = hw_qpageit_get_inc(&cq->hw_queue);
 155                 if (!vpage) {
 156                         ehea_error("hw_qpageit_get_inc failed");
 157                         goto out_kill_hwq;
 158                 }
 159
 160                 rpage = virt_to_abs(vpage);
 161                 hret = ehea_h_register_rpage(adapter->handle,
 162                                              0, EHEA_CQ_REGISTER_ORIG,
 163                                              cq->fw_handle, rpage, 1);
 164                 if (hret < H_SUCCESS) {
 165                         ehea_error("register_rpage_cq failed ehea_cq=%p "
 166                                    "hret=%lx counter=%i act_pages=%i",
 167                                    cq, hret, counter, cq->attr.nr_pages);
 168                         goto out_kill_hwq;
 169                 }
 170
 171                 if (counter == (cq->attr.nr_pages - 1)) {
 172                         vpage = hw_qpageit_get_inc(&cq->hw_queue);
 173
 174                         if ((hret != H_SUCCESS) || (vpage)) {
 175                                 ehea_error("registration of pages not "
 176                                            "complete hret=%lx\n", hret);
 177                                 goto out_kill_hwq;
 178                         }
 179                 } else {
 180                         if ((hret != H_PAGE_REGISTERED) || (!vpage)) {
 181                                 ehea_error("CQ: registration of page failed "
 182                                            "hret=%lx\n", hret);
 183                                 goto out_kill_hwq;
 184                         }
 185                 }
 186         }
 187
 188         hw_qeit_reset(&cq->hw_queue);
 189         epa = cq->epas.kernel;
 190         ehea_reset_cq_ep(cq);
 191         ehea_reset_cq_n1(cq);
 192
 193         return cq;
 194
 195 out_kill_hwq:
 196         hw_queue_dtor(&cq->hw_queue);
 197
 198 out_freeres:
 199         ehea_h_free_resource(adapter->handle, cq->fw_handle);
 200
 201 out_freemem:
 202         kfree(cq);
 203
 204 out_nomem:
 205         return NULL;
 206 }
 207
 208 int ehea_destroy_cq(struct ehea_cq *cq)
 209 {
 210         u64 adapter_handle, hret;
 211
 212         if (!cq)
 213                 return 0;
 214
 215         adapter_handle = cq->adapter->handle;
 216
 217         /* deregister all previous registered pages */
 218         hret = ehea_h_free_resource(adapter_handle, cq->fw_handle);
 219         if (hret != H_SUCCESS) {
 220                 ehea_error("destroy CQ failed");
 221                 return -EIO;
 222         }
 223
 224         hw_queue_dtor(&cq->hw_queue);
 225         kfree(cq);
 226
 227         return 0;
 228 }
 229
 230 struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
 231                                const enum ehea_eq_type type,
 232                                const u32 max_nr_of_eqes, const u8 eqe_gen)
 233 {
 234         int ret, i;
 235         u64 hret, rpage;
 236         void *vpage;
 237         struct ehea_eq *eq;
 238
 239         eq = kzalloc(sizeof(*eq), GFP_KERNEL);
 240         if (!eq) {
 241                 ehea_error("no mem for eq");
 242                 return NULL;
 243         }
 244
 245         eq->adapter = adapter;
 246         eq->attr.type = type;
 247         eq->attr.max_nr_of_eqes = max_nr_of_eqes;
 248         eq->attr.eqe_gen = eqe_gen;
 249         spin_lock_init(&eq->spinlock);
 250
 251         hret = ehea_h_alloc_resource_eq(adapter->handle,
 252                                         &eq->attr, &eq->fw_handle);
 253         if (hret != H_SUCCESS) {
 254                 ehea_error("alloc_resource_eq failed");
 255                 goto out_freemem;
 256         }
 257
 258         ret = hw_queue_ctor(&eq->hw_queue, eq->attr.nr_pages,
 259                             EHEA_PAGESIZE, sizeof(struct ehea_eqe));
 260         if (ret) {
 261                 ehea_error("can't allocate eq pages");
 262                 goto out_freeres;
 263         }
 264
 265         for (i = 0; i < eq->attr.nr_pages; i++) {
 266                 vpage = hw_qpageit_get_inc(&eq->hw_queue);
 267                 if (!vpage) {
 268                         ehea_error("hw_qpageit_get_inc failed");
 269                         hret = H_RESOURCE;
 270                         goto out_kill_hwq;
 271                 }
 272
 273                 rpage = virt_to_abs(vpage);
 274
 275                 hret = ehea_h_register_rpage(adapter->handle, 0,
 276                                              EHEA_EQ_REGISTER_ORIG,
 277                                              eq->fw_handle, rpage, 1);
 278
 279                 if (i == (eq->attr.nr_pages - 1)) {
 280                         /* last page */
 281                         vpage = hw_qpageit_get_inc(&eq->hw_queue);
 282                         if ((hret != H_SUCCESS) || (vpage)) {
 283                                 goto out_kill_hwq;
 284                         }
 285                 } else {
 286                         if ((hret != H_PAGE_REGISTERED) || (!vpage)) {
 287                                 goto out_kill_hwq;
 288                         }
 289                 }
 290         }
 291
 292         hw_qeit_reset(&eq->hw_queue);
 293         return eq;
 294
 295 out_kill_hwq:
 296         hw_queue_dtor(&eq->hw_queue);
 297
 298 out_freeres:
 299         ehea_h_free_resource(adapter->handle, eq->fw_handle);
 300
 301 out_freemem:
 302         kfree(eq);
 303         return NULL;
 304 }
 305
 306 struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq)
 307 {
 308         struct ehea_eqe *eqe;
 309         unsigned long flags;
 310
 311         spin_lock_irqsave(&eq->spinlock, flags);
 312         eqe = (struct ehea_eqe*)hw_eqit_eq_get_inc_valid(&eq->hw_queue);
 313         spin_unlock_irqrestore(&eq->spinlock, flags);
 314
 315         return eqe;
 316 }
 317
 318 int ehea_destroy_eq(struct ehea_eq *eq)
 319 {
 320         u64 hret;
 321         unsigned long flags;
 322
 323         if (!eq)
 324                 return 0;
 325
 326         spin_lock_irqsave(&eq->spinlock, flags);
 327
 328         hret = ehea_h_free_resource(eq->adapter->handle, eq->fw_handle);
 329         spin_unlock_irqrestore(&eq->spinlock, flags);
 330
 331         if (hret != H_SUCCESS) {
 332                 ehea_error("destroy_eq failed");
 333                 return -EIO;
 334         }
 335
 336         hw_queue_dtor(&eq->hw_queue);
 337         kfree(eq);
 338
 339         return 0;
 340 }
 341
 342 /**
 343  * allocates memory for a queue and registers pages in phyp
 344  */
 345 int ehea_qp_alloc_register(struct ehea_qp *qp, struct hw_queue *hw_queue,
 346                            int nr_pages, int wqe_size, int act_nr_sges,
 347                            struct ehea_adapter *adapter, int h_call_q_selector)
 348 {
 349         u64 hret, rpage;
 350         int ret, cnt;
 351         void *vpage;
 352
 353         ret = hw_queue_ctor(hw_queue, nr_pages, EHEA_PAGESIZE, wqe_size);
 354         if (ret)
 355                 return ret;
 356
 357         for (cnt = 0; cnt < nr_pages; cnt++) {
 358                 vpage = hw_qpageit_get_inc(hw_queue);
 359                 if (!vpage) {
 360                         ehea_error("hw_qpageit_get_inc failed");
 361                         goto out_kill_hwq;
 362                 }
 363                 rpage = virt_to_abs(vpage);
 364                 hret = ehea_h_register_rpage(adapter->handle,
 365                                              0, h_call_q_selector,
 366                                              qp->fw_handle, rpage, 1);
 367                 if (hret < H_SUCCESS) {
 368                         ehea_error("register_rpage_qp failed");
 369                         goto out_kill_hwq;
 370                 }
 371         }
 372         hw_qeit_reset(hw_queue);
 373         return 0;
 374
 375 out_kill_hwq:
 376         hw_queue_dtor(hw_queue);
 377         return -EIO;
 378 }
 379
 380 static inline u32 map_wqe_size(u8 wqe_enc_size)
 381 {
 382         return 128 << wqe_enc_size;
 383 }
 384
 385 struct ehea_qp *ehea_create_qp(struct ehea_adapter *adapter,
 386                                u32 pd, struct ehea_qp_init_attr *init_attr)
 387 {
 388         int ret;
 389         u64 hret;
 390         struct ehea_qp *qp;
 391         u32 wqe_size_in_bytes_sq, wqe_size_in_bytes_rq1;
 392         u32 wqe_size_in_bytes_rq2, wqe_size_in_bytes_rq3;
 393
 394
 395         qp = kzalloc(sizeof(*qp), GFP_KERNEL);
 396         if (!qp) {
 397                 ehea_error("no mem for qp");
 398                 return NULL;
 399         }
 400
 401         qp->adapter = adapter;
 402
 403         hret = ehea_h_alloc_resource_qp(adapter->handle, init_attr, pd,
 404                                         &qp->fw_handle, &qp->epas);
 405         if (hret != H_SUCCESS) {
 406                 ehea_error("ehea_h_alloc_resource_qp failed");
 407                 goto out_freemem;
 408         }
 409
 410         wqe_size_in_bytes_sq = map_wqe_size(init_attr->act_wqe_size_enc_sq);
 411         wqe_size_in_bytes_rq1 = map_wqe_size(init_attr->act_wqe_size_enc_rq1);
 412         wqe_size_in_bytes_rq2 = map_wqe_size(init_attr->act_wqe_size_enc_rq2);
 413         wqe_size_in_bytes_rq3 = map_wqe_size(init_attr->act_wqe_size_enc_rq3);
 414
 415         ret = ehea_qp_alloc_register(qp, &qp->hw_squeue, init_attr->nr_sq_pages,
 416                                      wqe_size_in_bytes_sq,
 417                                      init_attr->act_wqe_size_enc_sq, adapter,
 418                                      0);
 419         if (ret) {
 420                 ehea_error("can't register for sq ret=%x", ret);
 421                 goto out_freeres;
 422         }
 423
 424         ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue1,
 425                                      init_attr->nr_rq1_pages,
 426                                      wqe_size_in_bytes_rq1,
 427                                      init_attr->act_wqe_size_enc_rq1,
 428                                      adapter, 1);
 429         if (ret) {
 430                 ehea_error("can't register for rq1 ret=%x", ret);
 431                 goto out_kill_hwsq;
 432         }
 433
 434         if (init_attr->rq_count > 1) {
 435                 ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue2,
 436                                              init_attr->nr_rq2_pages,
 437                                              wqe_size_in_bytes_rq2,
 438                                              init_attr->act_wqe_size_enc_rq2,
 439                                              adapter, 2);
 440                 if (ret) {
 441                         ehea_error("can't register for rq2 ret=%x", ret);
 442                         goto out_kill_hwr1q;
 443                 }
 444         }
 445
 446         if (init_attr->rq_count > 2) {
 447                 ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue3,
 448                                              init_attr->nr_rq3_pages,
 449                                              wqe_size_in_bytes_rq3,
 450                                              init_attr->act_wqe_size_enc_rq3,
 451                                              adapter, 3);
 452                 if (ret) {
 453                         ehea_error("can't register for rq3 ret=%x", ret);
 454                         goto out_kill_hwr2q;
 455                 }
 456         }
 457
 458         qp->init_attr = *init_attr;
 459
 460         return qp;
 461
 462 out_kill_hwr2q:
 463         hw_queue_dtor(&qp->hw_rqueue2);
 464
 465 out_kill_hwr1q:
 466         hw_queue_dtor(&qp->hw_rqueue1);
 467
 468 out_kill_hwsq:
 469         hw_queue_dtor(&qp->hw_squeue);
 470
 471 out_freeres:
 472         ehea_h_disable_and_get_hea(adapter->handle, qp->fw_handle);
 473         ehea_h_free_resource(adapter->handle, qp->fw_handle);
 474
 475 out_freemem:
 476         kfree(qp);
 477         return NULL;
 478 }
 479
 480 int ehea_destroy_qp(struct ehea_qp *qp)
 481 {
 482         u64 hret;
 483         struct ehea_qp_init_attr *qp_attr = &qp->init_attr;
 484
 485         if (!qp)
 486                 return 0;
 487
 488         hret = ehea_h_free_resource(qp->adapter->handle, qp->fw_handle);
 489         if (hret != H_SUCCESS) {
 490                 ehea_error("destroy_qp failed");
 491                 return -EIO;
 492         }
 493
 494         hw_queue_dtor(&qp->hw_squeue);
 495         hw_queue_dtor(&qp->hw_rqueue1);
 496
 497         if (qp_attr->rq_count > 1)
 498                 hw_queue_dtor(&qp->hw_rqueue2);
 499         if (qp_attr->rq_count > 2)
 500                 hw_queue_dtor(&qp->hw_rqueue3);
 501         kfree(qp);
 502
 503         return 0;
 504 }
 505
 506 int ehea_reg_mr_adapter(struct ehea_adapter *adapter)
 507 {
 508         int i, k, ret;
 509         u64 hret, pt_abs, start, end, nr_pages;
 510         u32 acc_ctrl = EHEA_MR_ACC_CTRL;
 511         u64 *pt;
 512
 513         start = KERNELBASE;
 514         end = (u64)high_memory;
 515         nr_pages = (end - start) / EHEA_PAGESIZE;
 516
 517         pt =  kzalloc(PAGE_SIZE, GFP_KERNEL);
 518         if (!pt) {
 519                 ehea_error("no mem");
 520                 ret = -ENOMEM;
 521                 goto out;
 522         }
 523         pt_abs = virt_to_abs(pt);
 524
 525         hret = ehea_h_alloc_resource_mr(adapter->handle, start, end - start,
 526                                         acc_ctrl, adapter->pd,
 527                                         &adapter->mr.handle, &adapter->mr.lkey);
 528         if (hret != H_SUCCESS) {
 529                 ehea_error("alloc_resource_mr failed");
 530                 ret = -EIO;
 531                 goto out;
 532         }
 533
 534         adapter->mr.vaddr = KERNELBASE;
 535         k = 0;
 536
 537         while (nr_pages > 0) {
 538                 if (nr_pages > 1) {
 539                         u64 num_pages = min(nr_pages, (u64)512);
 540                         for (i = 0; i < num_pages; i++)
 541                                 pt[i] = virt_to_abs((void*)(((u64)start) +
 542                                                             ((k++) *
 543                                                              EHEA_PAGESIZE)));
 544
 545                         hret = ehea_h_register_rpage_mr(adapter->handle,
 546                                                         adapter->mr.handle, 0,
 547                                                         0, (u64)pt_abs,
 548                                                         num_pages);
 549                         nr_pages -= num_pages;
 550                 } else {
 551                         u64 abs_adr = virt_to_abs((void*)(((u64)start) +
 552                                                           (k * EHEA_PAGESIZE)));
 553
 554                         hret = ehea_h_register_rpage_mr(adapter->handle,
 555                                                         adapter->mr.handle, 0,
 556                                                         0, abs_adr,1);
 557                         nr_pages--;
 558                 }
 559
 560                 if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED)) {
 561                         ehea_h_free_resource(adapter->handle,
 562                                                 adapter->mr.handle);
 563                         ehea_error("register_rpage_mr failed: hret = %lX",
 564                                    hret);
 565                         ret = -EIO;
 566                         goto out;
 567                 }
 568         }
 569
 570         if (hret != H_SUCCESS) {
 571                 ehea_h_free_resource(adapter->handle, adapter->mr.handle);
 572                 ehea_error("register_rpage failed for last page: hret = %lX",
 573                            hret);
 574                 ret = -EIO;
 575                 goto out;
 576         }
 577         ret = 0;
 578 out:
 579         kfree(pt);
 580         return ret;
 581 }
 582
 583