linux/drivers/net/ethernet/ibm/ehea/ehea_qmr.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  linux/drivers/net/ethernet/ibm/ehea/ehea_qmr.c
   4 *
   5 *  eHEA ethernet device driver for IBM eServer System p
   6 *
   7 *  (C) Copyright IBM Corp. 2006
   8 *
   9 *  Authors:
  10 *       Christoph Raisch <raisch@de.ibm.com>
  11 *       Jan-Bernd Themann <themann@de.ibm.com>
  12 *       Thomas Klein <tklein@de.ibm.com>
  13 */
  14
  15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  16
  17#include <linux/mm.h>
  18#include <linux/slab.h>
  19#include "ehea.h"
  20#include "ehea_phyp.h"
  21#include "ehea_qmr.h"
  22
  23static struct ehea_bmap *ehea_bmap;
  24
  25static void *hw_qpageit_get_inc(struct hw_queue *queue)
  26{
  27        void *retvalue = hw_qeit_get(queue);
  28
  29        queue->current_q_offset += queue->pagesize;
  30        if (queue->current_q_offset > queue->queue_length) {
  31                queue->current_q_offset -= queue->pagesize;
  32                retvalue = NULL;
  33        } else if (((u64) retvalue) & (EHEA_PAGESIZE-1)) {
  34                pr_err("not on pageboundary\n");
  35                retvalue = NULL;
  36        }
  37        return retvalue;
  38}
  39
  40static int hw_queue_ctor(struct hw_queue *queue, const u32 nr_of_pages,
  41                          const u32 pagesize, const u32 qe_size)
  42{
  43        int pages_per_kpage = PAGE_SIZE / pagesize;
  44        int i, k;
  45
  46        if ((pagesize > PAGE_SIZE) || (!pages_per_kpage)) {
  47                pr_err("pagesize conflict! kernel pagesize=%d, ehea pagesize=%d\n",
  48                       (int)PAGE_SIZE, (int)pagesize);
  49                return -EINVAL;
  50        }
  51
  52        queue->queue_length = nr_of_pages * pagesize;
  53        queue->queue_pages = kmalloc_array(nr_of_pages, sizeof(void *),
  54                                           GFP_KERNEL);
  55        if (!queue->queue_pages)
  56                return -ENOMEM;
  57
  58        /*
  59         * allocate pages for queue:
  60         * outer loop allocates whole kernel pages (page aligned) and
  61         * inner loop divides a kernel page into smaller hea queue pages
  62         */
  63        i = 0;
  64        while (i < nr_of_pages) {
  65                u8 *kpage = (u8 *)get_zeroed_page(GFP_KERNEL);
  66                if (!kpage)
  67                        goto out_nomem;
  68                for (k = 0; k < pages_per_kpage && i < nr_of_pages; k++) {
  69                        (queue->queue_pages)[i] = (struct ehea_page *)kpage;
  70                        kpage += pagesize;
  71                        i++;
  72                }
  73        }
  74
  75        queue->current_q_offset = 0;
  76        queue->qe_size = qe_size;
  77        queue->pagesize = pagesize;
  78        queue->toggle_state = 1;
  79
  80        return 0;
  81out_nomem:
  82        for (i = 0; i < nr_of_pages; i += pages_per_kpage) {
  83                if (!(queue->queue_pages)[i])
  84                        break;
  85                free_page((unsigned long)(queue->queue_pages)[i]);
  86        }
  87        return -ENOMEM;
  88}
  89
  90static void hw_queue_dtor(struct hw_queue *queue)
  91{
  92        int pages_per_kpage;
  93        int i, nr_pages;
  94
  95        if (!queue || !queue->queue_pages)
  96                return;
  97
  98        pages_per_kpage = PAGE_SIZE / queue->pagesize;
  99
 100        nr_pages = queue->queue_length / queue->pagesize;
 101
 102        for (i = 0; i < nr_pages; i += pages_per_kpage)
 103                free_page((unsigned long)(queue->queue_pages)[i]);
 104
 105        kfree(queue->queue_pages);
 106}
 107
 108struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter,
 109                               int nr_of_cqe, u64 eq_handle, u32 cq_token)
 110{
 111        struct ehea_cq *cq;
 112        u64 hret, rpage;
 113        u32 counter;
 114        int ret;
 115        void *vpage;
 116
 117        cq = kzalloc(sizeof(*cq), GFP_KERNEL);
 118        if (!cq)
 119                goto out_nomem;
 120
 121        cq->attr.max_nr_of_cqes = nr_of_cqe;
 122        cq->attr.cq_token = cq_token;
 123        cq->attr.eq_handle = eq_handle;
 124
 125        cq->adapter = adapter;
 126
 127        hret = ehea_h_alloc_resource_cq(adapter->handle, &cq->attr,
 128                                        &cq->fw_handle, &cq->epas);
 129        if (hret != H_SUCCESS) {
 130                pr_err("alloc_resource_cq failed\n");
 131                goto out_freemem;
 132        }
 133
 134        ret = hw_queue_ctor(&cq->hw_queue, cq->attr.nr_pages,
 135                            EHEA_PAGESIZE, sizeof(struct ehea_cqe));
 136        if (ret)
 137                goto out_freeres;
 138
 139        for (counter = 0; counter < cq->attr.nr_pages; counter++) {
 140                vpage = hw_qpageit_get_inc(&cq->hw_queue);
 141                if (!vpage) {
 142                        pr_err("hw_qpageit_get_inc failed\n");
 143                        goto out_kill_hwq;
 144                }
 145
 146                rpage = __pa(vpage);
 147                hret = ehea_h_register_rpage(adapter->handle,
 148                                             0, EHEA_CQ_REGISTER_ORIG,
 149                                             cq->fw_handle, rpage, 1);
 150                if (hret < H_SUCCESS) {
 151                        pr_err("register_rpage_cq failed ehea_cq=%p hret=%llx counter=%i act_pages=%i\n",
 152                               cq, hret, counter, cq->attr.nr_pages);
 153                        goto out_kill_hwq;
 154                }
 155
 156                if (counter == (cq->attr.nr_pages - 1)) {
 157                        vpage = hw_qpageit_get_inc(&cq->hw_queue);
 158
 159                        if ((hret != H_SUCCESS) || (vpage)) {
 160                                pr_err("registration of pages not complete hret=%llx\n",
 161                                       hret);
 162                                goto out_kill_hwq;
 163                        }
 164                } else {
 165                        if (hret != H_PAGE_REGISTERED) {
 166                                pr_err("CQ: registration of page failed hret=%llx\n",
 167                                       hret);
 168                                goto out_kill_hwq;
 169                        }
 170                }
 171        }
 172
 173        hw_qeit_reset(&cq->hw_queue);
 174        ehea_reset_cq_ep(cq);
 175        ehea_reset_cq_n1(cq);
 176
 177        return cq;
 178
 179out_kill_hwq:
 180        hw_queue_dtor(&cq->hw_queue);
 181
 182out_freeres:
 183        ehea_h_free_resource(adapter->handle, cq->fw_handle, FORCE_FREE);
 184
 185out_freemem:
 186        kfree(cq);
 187
 188out_nomem:
 189        return NULL;
 190}
 191
 192static u64 ehea_destroy_cq_res(struct ehea_cq *cq, u64 force)
 193{
 194        u64 hret;
 195        u64 adapter_handle = cq->adapter->handle;
 196
 197        /* deregister all previous registered pages */
 198        hret = ehea_h_free_resource(adapter_handle, cq->fw_handle, force);
 199        if (hret != H_SUCCESS)
 200                return hret;
 201
 202        hw_queue_dtor(&cq->hw_queue);
 203        kfree(cq);
 204
 205        return hret;
 206}
 207
 208int ehea_destroy_cq(struct ehea_cq *cq)
 209{
 210        u64 hret, aer, aerr;
 211        if (!cq)
 212                return 0;
 213
 214        hcp_epas_dtor(&cq->epas);
 215        hret = ehea_destroy_cq_res(cq, NORMAL_FREE);
 216        if (hret == H_R_STATE) {
 217                ehea_error_data(cq->adapter, cq->fw_handle, &aer, &aerr);
 218                hret = ehea_destroy_cq_res(cq, FORCE_FREE);
 219        }
 220
 221        if (hret != H_SUCCESS) {
 222                pr_err("destroy CQ failed\n");
 223                return -EIO;
 224        }
 225
 226        return 0;
 227}
 228
 229struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
 230                               const enum ehea_eq_type type,
 231                               const u32 max_nr_of_eqes, const u8 eqe_gen)
 232{
 233        int ret, i;
 234        u64 hret, rpage;
 235        void *vpage;
 236        struct ehea_eq *eq;
 237
 238        eq = kzalloc(sizeof(*eq), GFP_KERNEL);
 239        if (!eq)
 240                return NULL;
 241
 242        eq->adapter = adapter;
 243        eq->attr.type = type;
 244        eq->attr.max_nr_of_eqes = max_nr_of_eqes;
 245        eq->attr.eqe_gen = eqe_gen;
 246        spin_lock_init(&eq->spinlock);
 247
 248        hret = ehea_h_alloc_resource_eq(adapter->handle,
 249                                        &eq->attr, &eq->fw_handle);
 250        if (hret != H_SUCCESS) {
 251                pr_err("alloc_resource_eq failed\n");
 252                goto out_freemem;
 253        }
 254
 255        ret = hw_queue_ctor(&eq->hw_queue, eq->attr.nr_pages,
 256                            EHEA_PAGESIZE, sizeof(struct ehea_eqe));
 257        if (ret) {
 258                pr_err("can't allocate eq pages\n");
 259                goto out_freeres;
 260        }
 261
 262        for (i = 0; i < eq->attr.nr_pages; i++) {
 263                vpage = hw_qpageit_get_inc(&eq->hw_queue);
 264                if (!vpage) {
 265                        pr_err("hw_qpageit_get_inc failed\n");
 266                        hret = H_RESOURCE;
 267                        goto out_kill_hwq;
 268                }
 269
 270                rpage = __pa(vpage);
 271
 272                hret = ehea_h_register_rpage(adapter->handle, 0,
 273                                             EHEA_EQ_REGISTER_ORIG,
 274                                             eq->fw_handle, rpage, 1);
 275
 276                if (i == (eq->attr.nr_pages - 1)) {
 277                        /* last page */
 278                        vpage = hw_qpageit_get_inc(&eq->hw_queue);
 279                        if ((hret != H_SUCCESS) || (vpage))
 280                                goto out_kill_hwq;
 281
 282                } else {
 283                        if (hret != H_PAGE_REGISTERED)
 284                                goto out_kill_hwq;
 285
 286                }
 287        }
 288
 289        hw_qeit_reset(&eq->hw_queue);
 290        return eq;
 291
 292out_kill_hwq:
 293        hw_queue_dtor(&eq->hw_queue);
 294
 295out_freeres:
 296        ehea_h_free_resource(adapter->handle, eq->fw_handle, FORCE_FREE);
 297
 298out_freemem:
 299        kfree(eq);
 300        return NULL;
 301}
 302
 303struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq)
 304{
 305        struct ehea_eqe *eqe;
 306        unsigned long flags;
 307
 308        spin_lock_irqsave(&eq->spinlock, flags);
 309        eqe = hw_eqit_eq_get_inc_valid(&eq->hw_queue);
 310        spin_unlock_irqrestore(&eq->spinlock, flags);
 311
 312        return eqe;
 313}
 314
 315static u64 ehea_destroy_eq_res(struct ehea_eq *eq, u64 force)
 316{
 317        u64 hret;
 318        unsigned long flags;
 319
 320        spin_lock_irqsave(&eq->spinlock, flags);
 321
 322        hret = ehea_h_free_resource(eq->adapter->handle, eq->fw_handle, force);
 323        spin_unlock_irqrestore(&eq->spinlock, flags);
 324
 325        if (hret != H_SUCCESS)
 326                return hret;
 327
 328        hw_queue_dtor(&eq->hw_queue);
 329        kfree(eq);
 330
 331        return hret;
 332}
 333
 334int ehea_destroy_eq(struct ehea_eq *eq)
 335{
 336        u64 hret, aer, aerr;
 337        if (!eq)
 338                return 0;
 339
 340        hcp_epas_dtor(&eq->epas);
 341
 342        hret = ehea_destroy_eq_res(eq, NORMAL_FREE);
 343        if (hret == H_R_STATE) {
 344                ehea_error_data(eq->adapter, eq->fw_handle, &aer, &aerr);
 345                hret = ehea_destroy_eq_res(eq, FORCE_FREE);
 346        }
 347
 348        if (hret != H_SUCCESS) {
 349                pr_err("destroy EQ failed\n");
 350                return -EIO;
 351        }
 352
 353        return 0;
 354}
 355
 356/* allocates memory for a queue and registers pages in phyp */
 357static int ehea_qp_alloc_register(struct ehea_qp *qp, struct hw_queue *hw_queue,
 358                           int nr_pages, int wqe_size, int act_nr_sges,
 359                           struct ehea_adapter *adapter, int h_call_q_selector)
 360{
 361        u64 hret, rpage;
 362        int ret, cnt;
 363        void *vpage;
 364
 365        ret = hw_queue_ctor(hw_queue, nr_pages, EHEA_PAGESIZE, wqe_size);
 366        if (ret)
 367                return ret;
 368
 369        for (cnt = 0; cnt < nr_pages; cnt++) {
 370                vpage = hw_qpageit_get_inc(hw_queue);
 371                if (!vpage) {
 372                        pr_err("hw_qpageit_get_inc failed\n");
 373                        goto out_kill_hwq;
 374                }
 375                rpage = __pa(vpage);
 376                hret = ehea_h_register_rpage(adapter->handle,
 377                                             0, h_call_q_selector,
 378                                             qp->fw_handle, rpage, 1);
 379                if (hret < H_SUCCESS) {
 380                        pr_err("register_rpage_qp failed\n");
 381                        goto out_kill_hwq;
 382                }
 383        }
 384        hw_qeit_reset(hw_queue);
 385        return 0;
 386
 387out_kill_hwq:
 388        hw_queue_dtor(hw_queue);
 389        return -EIO;
 390}
 391
 392static inline u32 map_wqe_size(u8 wqe_enc_size)
 393{
 394        return 128 << wqe_enc_size;
 395}
 396
 397struct ehea_qp *ehea_create_qp(struct ehea_adapter *adapter,
 398                               u32 pd, struct ehea_qp_init_attr *init_attr)
 399{
 400        int ret;
 401        u64 hret;
 402        struct ehea_qp *qp;
 403        u32 wqe_size_in_bytes_sq, wqe_size_in_bytes_rq1;
 404        u32 wqe_size_in_bytes_rq2, wqe_size_in_bytes_rq3;
 405
 406
 407        qp = kzalloc(sizeof(*qp), GFP_KERNEL);
 408        if (!qp)
 409                return NULL;
 410
 411        qp->adapter = adapter;
 412
 413        hret = ehea_h_alloc_resource_qp(adapter->handle, init_attr, pd,
 414                                        &qp->fw_handle, &qp->epas);
 415        if (hret != H_SUCCESS) {
 416                pr_err("ehea_h_alloc_resource_qp failed\n");
 417                goto out_freemem;
 418        }
 419
 420        wqe_size_in_bytes_sq = map_wqe_size(init_attr->act_wqe_size_enc_sq);
 421        wqe_size_in_bytes_rq1 = map_wqe_size(init_attr->act_wqe_size_enc_rq1);
 422        wqe_size_in_bytes_rq2 = map_wqe_size(init_attr->act_wqe_size_enc_rq2);
 423        wqe_size_in_bytes_rq3 = map_wqe_size(init_attr->act_wqe_size_enc_rq3);
 424
 425        ret = ehea_qp_alloc_register(qp, &qp->hw_squeue, init_attr->nr_sq_pages,
 426                                     wqe_size_in_bytes_sq,
 427                                     init_attr->act_wqe_size_enc_sq, adapter,
 428                                     0);
 429        if (ret) {
 430                pr_err("can't register for sq ret=%x\n", ret);
 431                goto out_freeres;
 432        }
 433
 434        ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue1,
 435                                     init_attr->nr_rq1_pages,
 436                                     wqe_size_in_bytes_rq1,
 437                                     init_attr->act_wqe_size_enc_rq1,
 438                                     adapter, 1);
 439        if (ret) {
 440                pr_err("can't register for rq1 ret=%x\n", ret);
 441                goto out_kill_hwsq;
 442        }
 443
 444        if (init_attr->rq_count > 1) {
 445                ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue2,
 446                                             init_attr->nr_rq2_pages,
 447                                             wqe_size_in_bytes_rq2,
 448                                             init_attr->act_wqe_size_enc_rq2,
 449                                             adapter, 2);
 450                if (ret) {
 451                        pr_err("can't register for rq2 ret=%x\n", ret);
 452                        goto out_kill_hwr1q;
 453                }
 454        }
 455
 456        if (init_attr->rq_count > 2) {
 457                ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue3,
 458                                             init_attr->nr_rq3_pages,
 459                                             wqe_size_in_bytes_rq3,
 460                                             init_attr->act_wqe_size_enc_rq3,
 461                                             adapter, 3);
 462                if (ret) {
 463                        pr_err("can't register for rq3 ret=%x\n", ret);
 464                        goto out_kill_hwr2q;
 465                }
 466        }
 467
 468        qp->init_attr = *init_attr;
 469
 470        return qp;
 471
 472out_kill_hwr2q:
 473        hw_queue_dtor(&qp->hw_rqueue2);
 474
 475out_kill_hwr1q:
 476        hw_queue_dtor(&qp->hw_rqueue1);
 477
 478out_kill_hwsq:
 479        hw_queue_dtor(&qp->hw_squeue);
 480
 481out_freeres:
 482        ehea_h_disable_and_get_hea(adapter->handle, qp->fw_handle);
 483        ehea_h_free_resource(adapter->handle, qp->fw_handle, FORCE_FREE);
 484
 485out_freemem:
 486        kfree(qp);
 487        return NULL;
 488}
 489
 490static u64 ehea_destroy_qp_res(struct ehea_qp *qp, u64 force)
 491{
 492        u64 hret;
 493        struct ehea_qp_init_attr *qp_attr = &qp->init_attr;
 494
 495
 496        ehea_h_disable_and_get_hea(qp->adapter->handle, qp->fw_handle);
 497        hret = ehea_h_free_resource(qp->adapter->handle, qp->fw_handle, force);
 498        if (hret != H_SUCCESS)
 499                return hret;
 500
 501        hw_queue_dtor(&qp->hw_squeue);
 502        hw_queue_dtor(&qp->hw_rqueue1);
 503
 504        if (qp_attr->rq_count > 1)
 505                hw_queue_dtor(&qp->hw_rqueue2);
 506        if (qp_attr->rq_count > 2)
 507                hw_queue_dtor(&qp->hw_rqueue3);
 508        kfree(qp);
 509
 510        return hret;
 511}
 512
 513int ehea_destroy_qp(struct ehea_qp *qp)
 514{
 515        u64 hret, aer, aerr;
 516        if (!qp)
 517                return 0;
 518
 519        hcp_epas_dtor(&qp->epas);
 520
 521        hret = ehea_destroy_qp_res(qp, NORMAL_FREE);
 522        if (hret == H_R_STATE) {
 523                ehea_error_data(qp->adapter, qp->fw_handle, &aer, &aerr);
 524                hret = ehea_destroy_qp_res(qp, FORCE_FREE);
 525        }
 526
 527        if (hret != H_SUCCESS) {
 528                pr_err("destroy QP failed\n");
 529                return -EIO;
 530        }
 531
 532        return 0;
 533}
 534
 535static inline int ehea_calc_index(unsigned long i, unsigned long s)
 536{
 537        return (i >> s) & EHEA_INDEX_MASK;
 538}
 539
 540static inline int ehea_init_top_bmap(struct ehea_top_bmap *ehea_top_bmap,
 541                                     int dir)
 542{
 543        if (!ehea_top_bmap->dir[dir]) {
 544                ehea_top_bmap->dir[dir] =
 545                        kzalloc(sizeof(struct ehea_dir_bmap), GFP_KERNEL);
 546                if (!ehea_top_bmap->dir[dir])
 547                        return -ENOMEM;
 548        }
 549        return 0;
 550}
 551
 552static inline int ehea_init_bmap(struct ehea_bmap *ehea_bmap, int top, int dir)
 553{
 554        if (!ehea_bmap->top[top]) {
 555                ehea_bmap->top[top] =
 556                        kzalloc(sizeof(struct ehea_top_bmap), GFP_KERNEL);
 557                if (!ehea_bmap->top[top])
 558                        return -ENOMEM;
 559        }
 560        return ehea_init_top_bmap(ehea_bmap->top[top], dir);
 561}
 562
 563static DEFINE_MUTEX(ehea_busmap_mutex);
 564static unsigned long ehea_mr_len;
 565
 566#define EHEA_BUSMAP_ADD_SECT 1
 567#define EHEA_BUSMAP_REM_SECT 0
 568
 569static void ehea_rebuild_busmap(void)
 570{
 571        u64 vaddr = EHEA_BUSMAP_START;
 572        int top, dir, idx;
 573
 574        for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
 575                struct ehea_top_bmap *ehea_top;
 576                int valid_dir_entries = 0;
 577
 578                if (!ehea_bmap->top[top])
 579                        continue;
 580                ehea_top = ehea_bmap->top[top];
 581                for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
 582                        struct ehea_dir_bmap *ehea_dir;
 583                        int valid_entries = 0;
 584
 585                        if (!ehea_top->dir[dir])
 586                                continue;
 587                        valid_dir_entries++;
 588                        ehea_dir = ehea_top->dir[dir];
 589                        for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
 590                                if (!ehea_dir->ent[idx])
 591                                        continue;
 592                                valid_entries++;
 593                                ehea_dir->ent[idx] = vaddr;
 594                                vaddr += EHEA_SECTSIZE;
 595                        }
 596                        if (!valid_entries) {
 597                                ehea_top->dir[dir] = NULL;
 598                                kfree(ehea_dir);
 599                        }
 600                }
 601                if (!valid_dir_entries) {
 602                        ehea_bmap->top[top] = NULL;
 603                        kfree(ehea_top);
 604                }
 605        }
 606}
 607
 608static int ehea_update_busmap(unsigned long pfn, unsigned long nr_pages, int add)
 609{
 610        unsigned long i, start_section, end_section;
 611
 612        if (!nr_pages)
 613                return 0;
 614
 615        if (!ehea_bmap) {
 616                ehea_bmap = kzalloc(sizeof(struct ehea_bmap), GFP_KERNEL);
 617                if (!ehea_bmap)
 618                        return -ENOMEM;
 619        }
 620
 621        start_section = (pfn * PAGE_SIZE) / EHEA_SECTSIZE;
 622        end_section = start_section + ((nr_pages * PAGE_SIZE) / EHEA_SECTSIZE);
 623        /* Mark entries as valid or invalid only; address is assigned later */
 624        for (i = start_section; i < end_section; i++) {
 625                u64 flag;
 626                int top = ehea_calc_index(i, EHEA_TOP_INDEX_SHIFT);
 627                int dir = ehea_calc_index(i, EHEA_DIR_INDEX_SHIFT);
 628                int idx = i & EHEA_INDEX_MASK;
 629
 630                if (add) {
 631                        int ret = ehea_init_bmap(ehea_bmap, top, dir);
 632                        if (ret)
 633                                return ret;
 634                        flag = 1; /* valid */
 635                        ehea_mr_len += EHEA_SECTSIZE;
 636                } else {
 637                        if (!ehea_bmap->top[top])
 638                                continue;
 639                        if (!ehea_bmap->top[top]->dir[dir])
 640                                continue;
 641                        flag = 0; /* invalid */
 642                        ehea_mr_len -= EHEA_SECTSIZE;
 643                }
 644
 645                ehea_bmap->top[top]->dir[dir]->ent[idx] = flag;
 646        }
 647        ehea_rebuild_busmap(); /* Assign contiguous addresses for mr */
 648        return 0;
 649}
 650
 651int ehea_add_sect_bmap(unsigned long pfn, unsigned long nr_pages)
 652{
 653        int ret;
 654
 655        mutex_lock(&ehea_busmap_mutex);
 656        ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
 657        mutex_unlock(&ehea_busmap_mutex);
 658        return ret;
 659}
 660
 661int ehea_rem_sect_bmap(unsigned long pfn, unsigned long nr_pages)
 662{
 663        int ret;
 664
 665        mutex_lock(&ehea_busmap_mutex);
 666        ret = ehea_update_busmap(pfn, nr_pages, EHEA_BUSMAP_REM_SECT);
 667        mutex_unlock(&ehea_busmap_mutex);
 668        return ret;
 669}
 670
 671static int ehea_is_hugepage(unsigned long pfn)
 672{
 673        int page_order;
 674
 675        if (pfn & EHEA_HUGEPAGE_PFN_MASK)
 676                return 0;
 677
 678        page_order = compound_order(pfn_to_page(pfn));
 679        if (page_order + PAGE_SHIFT != EHEA_HUGEPAGESHIFT)
 680                return 0;
 681
 682        return 1;
 683}
 684
 685static int ehea_create_busmap_callback(unsigned long initial_pfn,
 686                                       unsigned long total_nr_pages, void *arg)
 687{
 688        int ret;
 689        unsigned long pfn, start_pfn, end_pfn, nr_pages;
 690
 691        if ((total_nr_pages * PAGE_SIZE) < EHEA_HUGEPAGE_SIZE)
 692                return ehea_update_busmap(initial_pfn, total_nr_pages,
 693                                          EHEA_BUSMAP_ADD_SECT);
 694
 695        /* Given chunk is >= 16GB -> check for hugepages */
 696        start_pfn = initial_pfn;
 697        end_pfn = initial_pfn + total_nr_pages;
 698        pfn = start_pfn;
 699
 700        while (pfn < end_pfn) {
 701                if (ehea_is_hugepage(pfn)) {
 702                        /* Add mem found in front of the hugepage */
 703                        nr_pages = pfn - start_pfn;
 704                        ret = ehea_update_busmap(start_pfn, nr_pages,
 705                                                 EHEA_BUSMAP_ADD_SECT);
 706                        if (ret)
 707                                return ret;
 708
 709                        /* Skip the hugepage */
 710                        pfn += (EHEA_HUGEPAGE_SIZE / PAGE_SIZE);
 711                        start_pfn = pfn;
 712                } else
 713                        pfn += (EHEA_SECTSIZE / PAGE_SIZE);
 714        }
 715
 716        /* Add mem found behind the hugepage(s)  */
 717        nr_pages = pfn - start_pfn;
 718        return ehea_update_busmap(start_pfn, nr_pages, EHEA_BUSMAP_ADD_SECT);
 719}
 720
 721int ehea_create_busmap(void)
 722{
 723        int ret;
 724
 725        mutex_lock(&ehea_busmap_mutex);
 726        ehea_mr_len = 0;
 727        ret = walk_system_ram_range(0, 1ULL << MAX_PHYSMEM_BITS, NULL,
 728                                   ehea_create_busmap_callback);
 729        mutex_unlock(&ehea_busmap_mutex);
 730        return ret;
 731}
 732
 733void ehea_destroy_busmap(void)
 734{
 735        int top, dir;
 736        mutex_lock(&ehea_busmap_mutex);
 737        if (!ehea_bmap)
 738                goto out_destroy;
 739
 740        for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
 741                if (!ehea_bmap->top[top])
 742                        continue;
 743
 744                for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
 745                        if (!ehea_bmap->top[top]->dir[dir])
 746                                continue;
 747
 748                        kfree(ehea_bmap->top[top]->dir[dir]);
 749                }
 750
 751                kfree(ehea_bmap->top[top]);
 752        }
 753
 754        kfree(ehea_bmap);
 755        ehea_bmap = NULL;
 756out_destroy:
 757        mutex_unlock(&ehea_busmap_mutex);
 758}
 759
 760u64 ehea_map_vaddr(void *caddr)
 761{
 762        int top, dir, idx;
 763        unsigned long index, offset;
 764
 765        if (!ehea_bmap)
 766                return EHEA_INVAL_ADDR;
 767
 768        index = __pa(caddr) >> SECTION_SIZE_BITS;
 769        top = (index >> EHEA_TOP_INDEX_SHIFT) & EHEA_INDEX_MASK;
 770        if (!ehea_bmap->top[top])
 771                return EHEA_INVAL_ADDR;
 772
 773        dir = (index >> EHEA_DIR_INDEX_SHIFT) & EHEA_INDEX_MASK;
 774        if (!ehea_bmap->top[top]->dir[dir])
 775                return EHEA_INVAL_ADDR;
 776
 777        idx = index & EHEA_INDEX_MASK;
 778        if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
 779                return EHEA_INVAL_ADDR;
 780
 781        offset = (unsigned long)caddr & (EHEA_SECTSIZE - 1);
 782        return ehea_bmap->top[top]->dir[dir]->ent[idx] | offset;
 783}
 784
 785static inline void *ehea_calc_sectbase(int top, int dir, int idx)
 786{
 787        unsigned long ret = idx;
 788        ret |= dir << EHEA_DIR_INDEX_SHIFT;
 789        ret |= top << EHEA_TOP_INDEX_SHIFT;
 790        return __va(ret << SECTION_SIZE_BITS);
 791}
 792
 793static u64 ehea_reg_mr_section(int top, int dir, int idx, u64 *pt,
 794                               struct ehea_adapter *adapter,
 795                               struct ehea_mr *mr)
 796{
 797        void *pg;
 798        u64 j, m, hret;
 799        unsigned long k = 0;
 800        u64 pt_abs = __pa(pt);
 801
 802        void *sectbase = ehea_calc_sectbase(top, dir, idx);
 803
 804        for (j = 0; j < (EHEA_PAGES_PER_SECTION / EHEA_MAX_RPAGE); j++) {
 805
 806                for (m = 0; m < EHEA_MAX_RPAGE; m++) {
 807                        pg = sectbase + ((k++) * EHEA_PAGESIZE);
 808                        pt[m] = __pa(pg);
 809                }
 810                hret = ehea_h_register_rpage_mr(adapter->handle, mr->handle, 0,
 811                                                0, pt_abs, EHEA_MAX_RPAGE);
 812
 813                if ((hret != H_SUCCESS) &&
 814                    (hret != H_PAGE_REGISTERED)) {
 815                        ehea_h_free_resource(adapter->handle, mr->handle,
 816                                             FORCE_FREE);
 817                        pr_err("register_rpage_mr failed\n");
 818                        return hret;
 819                }
 820        }
 821        return hret;
 822}
 823
 824static u64 ehea_reg_mr_sections(int top, int dir, u64 *pt,
 825                                struct ehea_adapter *adapter,
 826                                struct ehea_mr *mr)
 827{
 828        u64 hret = H_SUCCESS;
 829        int idx;
 830
 831        for (idx = 0; idx < EHEA_MAP_ENTRIES; idx++) {
 832                if (!ehea_bmap->top[top]->dir[dir]->ent[idx])
 833                        continue;
 834
 835                hret = ehea_reg_mr_section(top, dir, idx, pt, adapter, mr);
 836                if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
 837                        return hret;
 838        }
 839        return hret;
 840}
 841
 842static u64 ehea_reg_mr_dir_sections(int top, u64 *pt,
 843                                    struct ehea_adapter *adapter,
 844                                    struct ehea_mr *mr)
 845{
 846        u64 hret = H_SUCCESS;
 847        int dir;
 848
 849        for (dir = 0; dir < EHEA_MAP_ENTRIES; dir++) {
 850                if (!ehea_bmap->top[top]->dir[dir])
 851                        continue;
 852
 853                hret = ehea_reg_mr_sections(top, dir, pt, adapter, mr);
 854                if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED))
 855                        return hret;
 856        }
 857        return hret;
 858}
 859
 860int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr)
 861{
 862        int ret;
 863        u64 *pt;
 864        u64 hret;
 865        u32 acc_ctrl = EHEA_MR_ACC_CTRL;
 866
 867        unsigned long top;
 868
 869        pt = (void *)get_zeroed_page(GFP_KERNEL);
 870        if (!pt) {
 871                pr_err("no mem\n");
 872                ret = -ENOMEM;
 873                goto out;
 874        }
 875
 876        hret = ehea_h_alloc_resource_mr(adapter->handle, EHEA_BUSMAP_START,
 877                                        ehea_mr_len, acc_ctrl, adapter->pd,
 878                                        &mr->handle, &mr->lkey);
 879
 880        if (hret != H_SUCCESS) {
 881                pr_err("alloc_resource_mr failed\n");
 882                ret = -EIO;
 883                goto out;
 884        }
 885
 886        if (!ehea_bmap) {
 887                ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);
 888                pr_err("no busmap available\n");
 889                ret = -EIO;
 890                goto out;
 891        }
 892
 893        for (top = 0; top < EHEA_MAP_ENTRIES; top++) {
 894                if (!ehea_bmap->top[top])
 895                        continue;
 896
 897                hret = ehea_reg_mr_dir_sections(top, pt, adapter, mr);
 898                if((hret != H_PAGE_REGISTERED) && (hret != H_SUCCESS))
 899                        break;
 900        }
 901
 902        if (hret != H_SUCCESS) {
 903                ehea_h_free_resource(adapter->handle, mr->handle, FORCE_FREE);
 904                pr_err("registering mr failed\n");
 905                ret = -EIO;
 906                goto out;
 907        }
 908
 909        mr->vaddr = EHEA_BUSMAP_START;
 910        mr->adapter = adapter;
 911        ret = 0;
 912out:
 913        free_page((unsigned long)pt);
 914        return ret;
 915}
 916
 917int ehea_rem_mr(struct ehea_mr *mr)
 918{
 919        u64 hret;
 920
 921        if (!mr || !mr->adapter)
 922                return -EINVAL;
 923
 924        hret = ehea_h_free_resource(mr->adapter->handle, mr->handle,
 925                                    FORCE_FREE);
 926        if (hret != H_SUCCESS) {
 927                pr_err("destroy MR failed\n");
 928                return -EIO;
 929        }
 930
 931        return 0;
 932}
 933
 934int ehea_gen_smr(struct ehea_adapter *adapter, struct ehea_mr *old_mr,
 935                 struct ehea_mr *shared_mr)
 936{
 937        u64 hret;
 938
 939        hret = ehea_h_register_smr(adapter->handle, old_mr->handle,
 940                                   old_mr->vaddr, EHEA_MR_ACC_CTRL,
 941                                   adapter->pd, shared_mr);
 942        if (hret != H_SUCCESS)
 943                return -EIO;
 944
 945        shared_mr->adapter = adapter;
 946
 947        return 0;
 948}
 949
 950static void print_error_data(u64 *data)
 951{
 952        int length;
 953        u64 type = EHEA_BMASK_GET(ERROR_DATA_TYPE, data[2]);
 954        u64 resource = data[1];
 955
 956        length = EHEA_BMASK_GET(ERROR_DATA_LENGTH, data[0]);
 957
 958        if (length > EHEA_PAGESIZE)
 959                length = EHEA_PAGESIZE;
 960
 961        if (type == EHEA_AER_RESTYPE_QP)
 962                pr_err("QP (resource=%llX) state: AER=0x%llX, AERR=0x%llX, port=%llX\n",
 963                       resource, data[6], data[12], data[22]);
 964        else if (type == EHEA_AER_RESTYPE_CQ)
 965                pr_err("CQ (resource=%llX) state: AER=0x%llX\n",
 966                       resource, data[6]);
 967        else if (type == EHEA_AER_RESTYPE_EQ)
 968                pr_err("EQ (resource=%llX) state: AER=0x%llX\n",
 969                       resource, data[6]);
 970
 971        ehea_dump(data, length, "error data");
 972}
 973
 974u64 ehea_error_data(struct ehea_adapter *adapter, u64 res_handle,
 975                    u64 *aer, u64 *aerr)
 976{
 977        unsigned long ret;
 978        u64 *rblock;
 979        u64 type = 0;
 980
 981        rblock = (void *)get_zeroed_page(GFP_KERNEL);
 982        if (!rblock) {
 983                pr_err("Cannot allocate rblock memory\n");
 984                goto out;
 985        }
 986
 987        ret = ehea_h_error_data(adapter->handle, res_handle, rblock);
 988
 989        if (ret == H_SUCCESS) {
 990                type = EHEA_BMASK_GET(ERROR_DATA_TYPE, rblock[2]);
 991                *aer = rblock[6];
 992                *aerr = rblock[12];
 993                print_error_data(rblock);
 994        } else if (ret == H_R_STATE) {
 995                pr_err("No error data available: %llX\n", res_handle);
 996        } else
 997                pr_err("Error data could not be fetched: %llX\n", res_handle);
 998
 999        free_page((unsigned long)rblock);
1000out:
1001        return type;
1002}
1003