drivers/infiniband/hw/hfi1/user_sdma.c

   1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
   2 /*
   3  * Copyright(c) 2020 - Cornelis Networks, Inc.
   4  * Copyright(c) 2015 - 2018 Intel Corporation.
   5  */
   6
   7 #include <linux/mm.h>
   8 #include <linux/types.h>
   9 #include <linux/device.h>
  10 #include <linux/dmapool.h>
  11 #include <linux/slab.h>
  12 #include <linux/list.h>
  13 #include <linux/highmem.h>
  14 #include <linux/io.h>
  15 #include <linux/uio.h>
  16 #include <linux/rbtree.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/delay.h>
  19 #include <linux/kthread.h>
  20 #include <linux/mmu_context.h>
  21 #include <linux/module.h>
  22 #include <linux/vmalloc.h>
  23 #include <linux/string.h>
  24
  25 #include "hfi.h"
  26 #include "sdma.h"
  27 #include "mmu_rb.h"
  28 #include "user_sdma.h"
  29 #include "verbs.h"  /* for the headers */
  30 #include "common.h" /* for struct hfi1_tid_info */
  31 #include "trace.h"
  32
  33 static uint hfi1_sdma_comp_ring_size = 128;
  34 module_param_named(sdma_comp_size, hfi1_sdma_comp_ring_size, uint, S_IRUGO);
  35 MODULE_PARM_DESC(sdma_comp_size, "Size of User SDMA completion ring. Default: 128");
  36
  37 static unsigned initial_pkt_count = 8;
  38
  39 static int user_sdma_send_pkts(struct user_sdma_request *req, u16 maxpkts);
  40 static void user_sdma_txreq_cb(struct sdma_txreq *txreq, int status);
  41 static inline void pq_update(struct hfi1_user_sdma_pkt_q *pq);
  42 static void user_sdma_free_request(struct user_sdma_request *req, bool unpin);
  43 static int pin_vector_pages(struct user_sdma_request *req,
  44                             struct user_sdma_iovec *iovec);
  45 static void unpin_vector_pages(struct mm_struct *mm, struct page **pages,
  46                                unsigned start, unsigned npages);
  47 static int check_header_template(struct user_sdma_request *req,
  48                                  struct hfi1_pkt_header *hdr, u32 lrhlen,
  49                                  u32 datalen);
  50 static int set_txreq_header(struct user_sdma_request *req,
  51                             struct user_sdma_txreq *tx, u32 datalen);
  52 static int set_txreq_header_ahg(struct user_sdma_request *req,
  53                                 struct user_sdma_txreq *tx, u32 len);
  54 static inline void set_comp_state(struct hfi1_user_sdma_pkt_q *pq,
  55                                   struct hfi1_user_sdma_comp_q *cq,
  56                                   u16 idx, enum hfi1_sdma_comp_state state,
  57                                   int ret);
  58 static inline u32 set_pkt_bth_psn(__be32 bthpsn, u8 expct, u32 frags);
  59 static inline u32 get_lrh_len(struct hfi1_pkt_header, u32 len);
  60
  61 static int defer_packet_queue(
  62         struct sdma_engine *sde,
  63         struct iowait_work *wait,
  64         struct sdma_txreq *txreq,
  65         uint seq,
  66         bool pkts_sent);
  67 static void activate_packet_queue(struct iowait *wait, int reason);
  68 static bool sdma_rb_filter(struct mmu_rb_node *node, unsigned long addr,
  69                            unsigned long len);
  70 static int sdma_rb_insert(void *arg, struct mmu_rb_node *mnode);
  71 static int sdma_rb_evict(void *arg, struct mmu_rb_node *mnode,
  72                          void *arg2, bool *stop);
  73 static void sdma_rb_remove(void *arg, struct mmu_rb_node *mnode);
  74 static int sdma_rb_invalidate(void *arg, struct mmu_rb_node *mnode);
  75
  76 static struct mmu_rb_ops sdma_rb_ops = {
  77         .filter = sdma_rb_filter,
  78         .insert = sdma_rb_insert,
  79         .evict = sdma_rb_evict,
  80         .remove = sdma_rb_remove,
  81         .invalidate = sdma_rb_invalidate
  82 };
  83
  84 static int defer_packet_queue(
  85         struct sdma_engine *sde,
  86         struct iowait_work *wait,
  87         struct sdma_txreq *txreq,
  88         uint seq,
  89         bool pkts_sent)
  90 {
  91         struct hfi1_user_sdma_pkt_q *pq =
  92                 container_of(wait->iow, struct hfi1_user_sdma_pkt_q, busy);
  93
  94         write_seqlock(&sde->waitlock);
  95         trace_hfi1_usdma_defer(pq, sde, &pq->busy);
  96         if (sdma_progress(sde, seq, txreq))
  97                 goto eagain;
  98         /*
  99          * We are assuming that if the list is enqueued somewhere, it
 100          * is to the dmawait list since that is the only place where
 101          * it is supposed to be enqueued.
 102          */
 103         xchg(&pq->state, SDMA_PKT_Q_DEFERRED);
 104         if (list_empty(&pq->busy.list)) {
 105                 pq->busy.lock = &sde->waitlock;
 106                 iowait_get_priority(&pq->busy);
 107                 iowait_queue(pkts_sent, &pq->busy, &sde->dmawait);
 108         }
 109         write_sequnlock(&sde->waitlock);
 110         return -EBUSY;
 111 eagain:
 112         write_sequnlock(&sde->waitlock);
 113         return -EAGAIN;
 114 }
 115
 116 static void activate_packet_queue(struct iowait *wait, int reason)
 117 {
 118         struct hfi1_user_sdma_pkt_q *pq =
 119                 container_of(wait, struct hfi1_user_sdma_pkt_q, busy);
 120
 121         trace_hfi1_usdma_activate(pq, wait, reason);
 122         xchg(&pq->state, SDMA_PKT_Q_ACTIVE);
 123         wake_up(&wait->wait_dma);
 124 };
 125
 126 int hfi1_user_sdma_alloc_queues(struct hfi1_ctxtdata *uctxt,
 127                                 struct hfi1_filedata *fd)
 128 {
 129         int ret = -ENOMEM;
 130         char buf[64];
 131         struct hfi1_devdata *dd;
 132         struct hfi1_user_sdma_comp_q *cq;
 133         struct hfi1_user_sdma_pkt_q *pq;
 134
 135         if (!uctxt || !fd)
 136                 return -EBADF;
 137
 138         if (!hfi1_sdma_comp_ring_size)
 139                 return -EINVAL;
 140
 141         dd = uctxt->dd;
 142
 143         pq = kzalloc(sizeof(*pq), GFP_KERNEL);
 144         if (!pq)
 145                 return -ENOMEM;
 146         pq->dd = dd;
 147         pq->ctxt = uctxt->ctxt;
 148         pq->subctxt = fd->subctxt;
 149         pq->n_max_reqs = hfi1_sdma_comp_ring_size;
 150         atomic_set(&pq->n_reqs, 0);
 151         init_waitqueue_head(&pq->wait);
 152         atomic_set(&pq->n_locked, 0);
 153
 154         iowait_init(&pq->busy, 0, NULL, NULL, defer_packet_queue,
 155                     activate_packet_queue, NULL, NULL);
 156         pq->reqidx = 0;
 157
 158         pq->reqs = kcalloc(hfi1_sdma_comp_ring_size,
 159                            sizeof(*pq->reqs),
 160                            GFP_KERNEL);
 161         if (!pq->reqs)
 162                 goto pq_reqs_nomem;
 163
 164         pq->req_in_use = bitmap_zalloc(hfi1_sdma_comp_ring_size, GFP_KERNEL);
 165         if (!pq->req_in_use)
 166                 goto pq_reqs_no_in_use;
 167
 168         snprintf(buf, 64, "txreq-kmem-cache-%u-%u-%u", dd->unit, uctxt->ctxt,
 169                  fd->subctxt);
 170         pq->txreq_cache = kmem_cache_create(buf,
 171                                             sizeof(struct user_sdma_txreq),
 172                                             L1_CACHE_BYTES,
 173                                             SLAB_HWCACHE_ALIGN,
 174                                             NULL);
 175         if (!pq->txreq_cache) {
 176                 dd_dev_err(dd, "[%u] Failed to allocate TxReq cache\n",
 177                            uctxt->ctxt);
 178                 goto pq_txreq_nomem;
 179         }
 180
 181         cq = kzalloc(sizeof(*cq), GFP_KERNEL);
 182         if (!cq)
 183                 goto cq_nomem;
 184
 185         cq->comps = vmalloc_user(PAGE_ALIGN(sizeof(*cq->comps)
 186                                  * hfi1_sdma_comp_ring_size));
 187         if (!cq->comps)
 188                 goto cq_comps_nomem;
 189
 190         cq->nentries = hfi1_sdma_comp_ring_size;
 191
 192         ret = hfi1_mmu_rb_register(pq, &sdma_rb_ops, dd->pport->hfi1_wq,
 193                                    &pq->handler);
 194         if (ret) {
 195                 dd_dev_err(dd, "Failed to register with MMU %d", ret);
 196                 goto pq_mmu_fail;
 197         }
 198
 199         rcu_assign_pointer(fd->pq, pq);
 200         fd->cq = cq;
 201
 202         return 0;
 203
 204 pq_mmu_fail:
 205         vfree(cq->comps);
 206 cq_comps_nomem:
 207         kfree(cq);
 208 cq_nomem:
 209         kmem_cache_destroy(pq->txreq_cache);
 210 pq_txreq_nomem:
 211         bitmap_free(pq->req_in_use);
 212 pq_reqs_no_in_use:
 213         kfree(pq->reqs);
 214 pq_reqs_nomem:
 215         kfree(pq);
 216
 217         return ret;
 218 }
 219
 220 static void flush_pq_iowait(struct hfi1_user_sdma_pkt_q *pq)
 221 {
 222         unsigned long flags;
 223         seqlock_t *lock = pq->busy.lock;
 224
 225         if (!lock)
 226                 return;
 227         write_seqlock_irqsave(lock, flags);
 228         if (!list_empty(&pq->busy.list)) {
 229                 list_del_init(&pq->busy.list);
 230                 pq->busy.lock = NULL;
 231         }
 232         write_sequnlock_irqrestore(lock, flags);
 233 }
 234
 235 int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd,
 236                                struct hfi1_ctxtdata *uctxt)
 237 {
 238         struct hfi1_user_sdma_pkt_q *pq;
 239
 240         trace_hfi1_sdma_user_free_queues(uctxt->dd, uctxt->ctxt, fd->subctxt);
 241
 242         spin_lock(&fd->pq_rcu_lock);
 243         pq = srcu_dereference_check(fd->pq, &fd->pq_srcu,
 244                                     lockdep_is_held(&fd->pq_rcu_lock));
 245         if (pq) {
 246                 rcu_assign_pointer(fd->pq, NULL);
 247                 spin_unlock(&fd->pq_rcu_lock);
 248                 synchronize_srcu(&fd->pq_srcu);
 249                 /* at this point there can be no more new requests */
 250                 if (pq->handler)
 251                         hfi1_mmu_rb_unregister(pq->handler);
 252                 iowait_sdma_drain(&pq->busy);
 253                 /* Wait until all requests have been freed. */
 254                 wait_event_interruptible(
 255                         pq->wait,
 256                         !atomic_read(&pq->n_reqs));
 257                 kfree(pq->reqs);
 258                 bitmap_free(pq->req_in_use);
 259                 kmem_cache_destroy(pq->txreq_cache);
 260                 flush_pq_iowait(pq);
 261                 kfree(pq);
 262         } else {
 263                 spin_unlock(&fd->pq_rcu_lock);
 264         }
 265         if (fd->cq) {
 266                 vfree(fd->cq->comps);
 267                 kfree(fd->cq);
 268                 fd->cq = NULL;
 269         }
 270         return 0;
 271 }
 272
 273 static u8 dlid_to_selector(u16 dlid)
 274 {
 275         static u8 mapping[256];
 276         static int initialized;
 277         static u8 next;
 278         int hash;
 279
 280         if (!initialized) {
 281                 memset(mapping, 0xFF, 256);
 282                 initialized = 1;
 283         }
 284
 285         hash = ((dlid >> 8) ^ dlid) & 0xFF;
 286         if (mapping[hash] == 0xFF) {
 287                 mapping[hash] = next;
 288                 next = (next + 1) & 0x7F;
 289         }
 290
 291         return mapping[hash];
 292 }
 293
 294 /**
 295  * hfi1_user_sdma_process_request() - Process and start a user sdma request
 296  * @fd: valid file descriptor
 297  * @iovec: array of io vectors to process
 298  * @dim: overall iovec array size
 299  * @count: number of io vector array entries processed
 300  */
 301 int hfi1_user_sdma_process_request(struct hfi1_filedata *fd,
 302                                    struct iovec *iovec, unsigned long dim,
 303                                    unsigned long *count)
 304 {
 305         int ret = 0, i;
 306         struct hfi1_ctxtdata *uctxt = fd->uctxt;
 307         struct hfi1_user_sdma_pkt_q *pq =
 308                 srcu_dereference(fd->pq, &fd->pq_srcu);
 309         struct hfi1_user_sdma_comp_q *cq = fd->cq;
 310         struct hfi1_devdata *dd = pq->dd;
 311         unsigned long idx = 0;
 312         u8 pcount = initial_pkt_count;
 313         struct sdma_req_info info;
 314         struct user_sdma_request *req;
 315         u8 opcode, sc, vl;
 316         u16 pkey;
 317         u32 slid;
 318         u16 dlid;
 319         u32 selector;
 320
 321         if (iovec[idx].iov_len < sizeof(info) + sizeof(req->hdr)) {
 322                 hfi1_cdbg(
 323                    SDMA,
 324                    "[%u:%u:%u] First vector not big enough for header %lu/%lu",
 325                    dd->unit, uctxt->ctxt, fd->subctxt,
 326                    iovec[idx].iov_len, sizeof(info) + sizeof(req->hdr));
 327                 return -EINVAL;
 328         }
 329         ret = copy_from_user(&info, iovec[idx].iov_base, sizeof(info));
 330         if (ret) {
 331                 hfi1_cdbg(SDMA, "[%u:%u:%u] Failed to copy info QW (%d)",
 332                           dd->unit, uctxt->ctxt, fd->subctxt, ret);
 333                 return -EFAULT;
 334         }
 335
 336         trace_hfi1_sdma_user_reqinfo(dd, uctxt->ctxt, fd->subctxt,
 337                                      (u16 *)&info);
 338         if (info.comp_idx >= hfi1_sdma_comp_ring_size) {
 339                 hfi1_cdbg(SDMA,
 340                           "[%u:%u:%u:%u] Invalid comp index",
 341                           dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx);
 342                 return -EINVAL;
 343         }
 344
 345         /*
 346          * Sanity check the header io vector count.  Need at least 1 vector
 347          * (header) and cannot be larger than the actual io vector count.
 348          */
 349         if (req_iovcnt(info.ctrl) < 1 || req_iovcnt(info.ctrl) > dim) {
 350                 hfi1_cdbg(SDMA,
 351                           "[%u:%u:%u:%u] Invalid iov count %d, dim %ld",
 352                           dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx,
 353                           req_iovcnt(info.ctrl), dim);
 354                 return -EINVAL;
 355         }
 356
 357         if (!info.fragsize) {
 358                 hfi1_cdbg(SDMA,
 359                           "[%u:%u:%u:%u] Request does not specify fragsize",
 360                           dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx);
 361                 return -EINVAL;
 362         }
 363
 364         /* Try to claim the request. */
 365         if (test_and_set_bit(info.comp_idx, pq->req_in_use)) {
 366                 hfi1_cdbg(SDMA, "[%u:%u:%u] Entry %u is in use",
 367                           dd->unit, uctxt->ctxt, fd->subctxt,
 368                           info.comp_idx);
 369                 return -EBADSLT;
 370         }
 371         /*
 372          * All safety checks have been done and this request has been claimed.
 373          */
 374         trace_hfi1_sdma_user_process_request(dd, uctxt->ctxt, fd->subctxt,
 375                                              info.comp_idx);
 376         req = pq->reqs + info.comp_idx;
 377         req->data_iovs = req_iovcnt(info.ctrl) - 1; /* subtract header vector */
 378         req->data_len  = 0;
 379         req->pq = pq;
 380         req->cq = cq;
 381         req->ahg_idx = -1;
 382         req->iov_idx = 0;
 383         req->sent = 0;
 384         req->seqnum = 0;
 385         req->seqcomp = 0;
 386         req->seqsubmitted = 0;
 387         req->tids = NULL;
 388         req->has_error = 0;
 389         INIT_LIST_HEAD(&req->txps);
 390
 391         memcpy(&req->info, &info, sizeof(info));
 392
 393         /* The request is initialized, count it */
 394         atomic_inc(&pq->n_reqs);
 395
 396         if (req_opcode(info.ctrl) == EXPECTED) {
 397                 /* expected must have a TID info and at least one data vector */
 398                 if (req->data_iovs < 2) {
 399                         SDMA_DBG(req,
 400                                  "Not enough vectors for expected request");
 401                         ret = -EINVAL;
 402                         goto free_req;
 403                 }
 404                 req->data_iovs--;
 405         }
 406
 407         if (!info.npkts || req->data_iovs > MAX_VECTORS_PER_REQ) {
 408                 SDMA_DBG(req, "Too many vectors (%u/%u)", req->data_iovs,
 409                          MAX_VECTORS_PER_REQ);
 410                 ret = -EINVAL;
 411                 goto free_req;
 412         }
 413         /* Copy the header from the user buffer */
 414         ret = copy_from_user(&req->hdr, iovec[idx].iov_base + sizeof(info),
 415                              sizeof(req->hdr));
 416         if (ret) {
 417                 SDMA_DBG(req, "Failed to copy header template (%d)", ret);
 418                 ret = -EFAULT;
 419                 goto free_req;
 420         }
 421
 422         /* If Static rate control is not enabled, sanitize the header. */
 423         if (!HFI1_CAP_IS_USET(STATIC_RATE_CTRL))
 424                 req->hdr.pbc[2] = 0;
 425
 426         /* Validate the opcode. Do not trust packets from user space blindly. */
 427         opcode = (be32_to_cpu(req->hdr.bth[0]) >> 24) & 0xff;
 428         if ((opcode & USER_OPCODE_CHECK_MASK) !=
 429              USER_OPCODE_CHECK_VAL) {
 430                 SDMA_DBG(req, "Invalid opcode (%d)", opcode);
 431                 ret = -EINVAL;
 432                 goto free_req;
 433         }
 434         /*
 435          * Validate the vl. Do not trust packets from user space blindly.
 436          * VL comes from PBC, SC comes from LRH, and the VL needs to
 437          * match the SC look up.
 438          */
 439         vl = (le16_to_cpu(req->hdr.pbc[0]) >> 12) & 0xF;
 440         sc = (((be16_to_cpu(req->hdr.lrh[0]) >> 12) & 0xF) |
 441               (((le16_to_cpu(req->hdr.pbc[1]) >> 14) & 0x1) << 4));
 442         if (vl >= dd->pport->vls_operational ||
 443             vl != sc_to_vlt(dd, sc)) {
 444                 SDMA_DBG(req, "Invalid SC(%u)/VL(%u)", sc, vl);
 445                 ret = -EINVAL;
 446                 goto free_req;
 447         }
 448
 449         /* Checking P_KEY for requests from user-space */
 450         pkey = (u16)be32_to_cpu(req->hdr.bth[0]);
 451         slid = be16_to_cpu(req->hdr.lrh[3]);
 452         if (egress_pkey_check(dd->pport, slid, pkey, sc, PKEY_CHECK_INVALID)) {
 453                 ret = -EINVAL;
 454                 goto free_req;
 455         }
 456
 457         /*
 458          * Also should check the BTH.lnh. If it says the next header is GRH then
 459          * the RXE parsing will be off and will land in the middle of the KDETH
 460          * or miss it entirely.
 461          */
 462         if ((be16_to_cpu(req->hdr.lrh[0]) & 0x3) == HFI1_LRH_GRH) {
 463                 SDMA_DBG(req, "User tried to pass in a GRH");
 464                 ret = -EINVAL;
 465                 goto free_req;
 466         }
 467
 468         req->koffset = le32_to_cpu(req->hdr.kdeth.swdata[6]);
 469         /*
 470          * Calculate the initial TID offset based on the values of
 471          * KDETH.OFFSET and KDETH.OM that are passed in.
 472          */
 473         req->tidoffset = KDETH_GET(req->hdr.kdeth.ver_tid_offset, OFFSET) *
 474                 (KDETH_GET(req->hdr.kdeth.ver_tid_offset, OM) ?
 475                  KDETH_OM_LARGE : KDETH_OM_SMALL);
 476         trace_hfi1_sdma_user_initial_tidoffset(dd, uctxt->ctxt, fd->subctxt,
 477                                                info.comp_idx, req->tidoffset);
 478         idx++;
 479
 480         /* Save all the IO vector structures */
 481         for (i = 0; i < req->data_iovs; i++) {
 482                 req->iovs[i].offset = 0;
 483                 INIT_LIST_HEAD(&req->iovs[i].list);
 484                 memcpy(&req->iovs[i].iov,
 485                        iovec + idx++,
 486                        sizeof(req->iovs[i].iov));
 487                 ret = pin_vector_pages(req, &req->iovs[i]);
 488                 if (ret) {
 489                         req->data_iovs = i;
 490                         goto free_req;
 491                 }
 492                 req->data_len += req->iovs[i].iov.iov_len;
 493         }
 494         trace_hfi1_sdma_user_data_length(dd, uctxt->ctxt, fd->subctxt,
 495                                          info.comp_idx, req->data_len);
 496         if (pcount > req->info.npkts)
 497                 pcount = req->info.npkts;
 498         /*
 499          * Copy any TID info
 500          * User space will provide the TID info only when the
 501          * request type is EXPECTED. This is true even if there is
 502          * only one packet in the request and the header is already
 503          * setup. The reason for the singular TID case is that the
 504          * driver needs to perform safety checks.
 505          */
 506         if (req_opcode(req->info.ctrl) == EXPECTED) {
 507                 u16 ntids = iovec[idx].iov_len / sizeof(*req->tids);
 508                 u32 *tmp;
 509
 510                 if (!ntids || ntids > MAX_TID_PAIR_ENTRIES) {
 511                         ret = -EINVAL;
 512                         goto free_req;
 513                 }
 514
 515                 /*
 516                  * We have to copy all of the tids because they may vary
 517                  * in size and, therefore, the TID count might not be
 518                  * equal to the pkt count. However, there is no way to
 519                  * tell at this point.
 520                  */
 521                 tmp = memdup_user(iovec[idx].iov_base,
 522                                   ntids * sizeof(*req->tids));
 523                 if (IS_ERR(tmp)) {
 524                         ret = PTR_ERR(tmp);
 525                         SDMA_DBG(req, "Failed to copy %d TIDs (%d)",
 526                                  ntids, ret);
 527                         goto free_req;
 528                 }
 529                 req->tids = tmp;
 530                 req->n_tids = ntids;
 531                 req->tididx = 0;
 532                 idx++;
 533         }
 534
 535         dlid = be16_to_cpu(req->hdr.lrh[1]);
 536         selector = dlid_to_selector(dlid);
 537         selector += uctxt->ctxt + fd->subctxt;
 538         req->sde = sdma_select_user_engine(dd, selector, vl);
 539
 540         if (!req->sde || !sdma_running(req->sde)) {
 541                 ret = -ECOMM;
 542                 goto free_req;
 543         }
 544
 545         /* We don't need an AHG entry if the request contains only one packet */
 546         if (req->info.npkts > 1 && HFI1_CAP_IS_USET(SDMA_AHG))
 547                 req->ahg_idx = sdma_ahg_alloc(req->sde);
 548
 549         set_comp_state(pq, cq, info.comp_idx, QUEUED, 0);
 550         pq->state = SDMA_PKT_Q_ACTIVE;
 551
 552         /*
 553          * This is a somewhat blocking send implementation.
 554          * The driver will block the caller until all packets of the
 555          * request have been submitted to the SDMA engine. However, it
 556          * will not wait for send completions.
 557          */
 558         while (req->seqsubmitted != req->info.npkts) {
 559                 ret = user_sdma_send_pkts(req, pcount);
 560                 if (ret < 0) {
 561                         int we_ret;
 562
 563                         if (ret != -EBUSY)
 564                                 goto free_req;
 565                         we_ret = wait_event_interruptible_timeout(
 566                                 pq->busy.wait_dma,
 567                                 pq->state == SDMA_PKT_Q_ACTIVE,
 568                                 msecs_to_jiffies(
 569                                         SDMA_IOWAIT_TIMEOUT));
 570                         trace_hfi1_usdma_we(pq, we_ret);
 571                         if (we_ret <= 0)
 572                                 flush_pq_iowait(pq);
 573                 }
 574         }
 575         *count += idx;
 576         return 0;
 577 free_req:
 578         /*
 579          * If the submitted seqsubmitted == npkts, the completion routine
 580          * controls the final state.  If sequbmitted < npkts, wait for any
 581          * outstanding packets to finish before cleaning up.
 582          */
 583         if (req->seqsubmitted < req->info.npkts) {
 584                 if (req->seqsubmitted)
 585                         wait_event(pq->busy.wait_dma,
 586                                    (req->seqcomp == req->seqsubmitted - 1));
 587                 user_sdma_free_request(req, true);
 588                 pq_update(pq);
 589                 set_comp_state(pq, cq, info.comp_idx, ERROR, ret);
 590         }
 591         return ret;
 592 }
 593
 594 static inline u32 compute_data_length(struct user_sdma_request *req,
 595                                       struct user_sdma_txreq *tx)
 596 {
 597         /*
 598          * Determine the proper size of the packet data.
 599          * The size of the data of the first packet is in the header
 600          * template. However, it includes the header and ICRC, which need
 601          * to be subtracted.
 602          * The minimum representable packet data length in a header is 4 bytes,
 603          * therefore, when the data length request is less than 4 bytes, there's
 604          * only one packet, and the packet data length is equal to that of the
 605          * request data length.
 606          * The size of the remaining packets is the minimum of the frag
 607          * size (MTU) or remaining data in the request.
 608          */
 609         u32 len;
 610
 611         if (!req->seqnum) {
 612                 if (req->data_len < sizeof(u32))
 613                         len = req->data_len;
 614                 else
 615                         len = ((be16_to_cpu(req->hdr.lrh[2]) << 2) -
 616                                (sizeof(tx->hdr) - 4));
 617         } else if (req_opcode(req->info.ctrl) == EXPECTED) {
 618                 u32 tidlen = EXP_TID_GET(req->tids[req->tididx], LEN) *
 619                         PAGE_SIZE;
 620                 /*
 621                  * Get the data length based on the remaining space in the
 622                  * TID pair.
 623                  */
 624                 len = min(tidlen - req->tidoffset, (u32)req->info.fragsize);
 625                 /* If we've filled up the TID pair, move to the next one. */
 626                 if (unlikely(!len) && ++req->tididx < req->n_tids &&
 627                     req->tids[req->tididx]) {
 628                         tidlen = EXP_TID_GET(req->tids[req->tididx],
 629                                              LEN) * PAGE_SIZE;
 630                         req->tidoffset = 0;
 631                         len = min_t(u32, tidlen, req->info.fragsize);
 632                 }
 633                 /*
 634                  * Since the TID pairs map entire pages, make sure that we
 635                  * are not going to try to send more data that we have
 636                  * remaining.
 637                  */
 638                 len = min(len, req->data_len - req->sent);
 639         } else {
 640                 len = min(req->data_len - req->sent, (u32)req->info.fragsize);
 641         }
 642         trace_hfi1_sdma_user_compute_length(req->pq->dd,
 643                                             req->pq->ctxt,
 644                                             req->pq->subctxt,
 645                                             req->info.comp_idx,
 646                                             len);
 647         return len;
 648 }
 649
 650 static inline u32 pad_len(u32 len)
 651 {
 652         if (len & (sizeof(u32) - 1))
 653                 len += sizeof(u32) - (len & (sizeof(u32) - 1));
 654         return len;
 655 }
 656
 657 static inline u32 get_lrh_len(struct hfi1_pkt_header hdr, u32 len)
 658 {
 659         /* (Size of complete header - size of PBC) + 4B ICRC + data length */
 660         return ((sizeof(hdr) - sizeof(hdr.pbc)) + 4 + len);
 661 }
 662
 663 static int user_sdma_txadd_ahg(struct user_sdma_request *req,
 664                                struct user_sdma_txreq *tx,
 665                                u32 datalen)
 666 {
 667         int ret;
 668         u16 pbclen = le16_to_cpu(req->hdr.pbc[0]);
 669         u32 lrhlen = get_lrh_len(req->hdr, pad_len(datalen));
 670         struct hfi1_user_sdma_pkt_q *pq = req->pq;
 671
 672         /*
 673          * Copy the request header into the tx header
 674          * because the HW needs a cacheline-aligned
 675          * address.
 676          * This copy can be optimized out if the hdr
 677          * member of user_sdma_request were also
 678          * cacheline aligned.
 679          */
 680         memcpy(&tx->hdr, &req->hdr, sizeof(tx->hdr));
 681         if (PBC2LRH(pbclen) != lrhlen) {
 682                 pbclen = (pbclen & 0xf000) | LRH2PBC(lrhlen);
 683                 tx->hdr.pbc[0] = cpu_to_le16(pbclen);
 684         }
 685         ret = check_header_template(req, &tx->hdr, lrhlen, datalen);
 686         if (ret)
 687                 return ret;
 688         ret = sdma_txinit_ahg(&tx->txreq, SDMA_TXREQ_F_AHG_COPY,
 689                               sizeof(tx->hdr) + datalen, req->ahg_idx,
 690                               0, NULL, 0, user_sdma_txreq_cb);
 691         if (ret)
 692                 return ret;
 693         ret = sdma_txadd_kvaddr(pq->dd, &tx->txreq, &tx->hdr, sizeof(tx->hdr));
 694         if (ret)
 695                 sdma_txclean(pq->dd, &tx->txreq);
 696         return ret;
 697 }
 698
 699 static int user_sdma_txadd(struct user_sdma_request *req,
 700                            struct user_sdma_txreq *tx,
 701                            struct user_sdma_iovec *iovec, u32 datalen,
 702                            u32 *queued_ptr, u32 *data_sent_ptr,
 703                            u64 *iov_offset_ptr)
 704 {
 705         int ret;
 706         unsigned int pageidx, len;
 707         unsigned long base, offset;
 708         u64 iov_offset = *iov_offset_ptr;
 709         u32 queued = *queued_ptr, data_sent = *data_sent_ptr;
 710         struct hfi1_user_sdma_pkt_q *pq = req->pq;
 711
 712         base = (unsigned long)iovec->iov.iov_base;
 713         offset = offset_in_page(base + iovec->offset + iov_offset);
 714         pageidx = (((iovec->offset + iov_offset + base) - (base & PAGE_MASK)) >>
 715                    PAGE_SHIFT);
 716         len = offset + req->info.fragsize > PAGE_SIZE ?
 717                 PAGE_SIZE - offset : req->info.fragsize;
 718         len = min((datalen - queued), len);
 719         ret = sdma_txadd_page(pq->dd, &tx->txreq, iovec->pages[pageidx],
 720                               offset, len);
 721         if (ret) {
 722                 SDMA_DBG(req, "SDMA txreq add page failed %d\n", ret);
 723                 return ret;
 724         }
 725         iov_offset += len;
 726         queued += len;
 727         data_sent += len;
 728         if (unlikely(queued < datalen && pageidx == iovec->npages &&
 729                      req->iov_idx < req->data_iovs - 1)) {
 730                 iovec->offset += iov_offset;
 731                 iovec = &req->iovs[++req->iov_idx];
 732                 iov_offset = 0;
 733         }
 734
 735         *queued_ptr = queued;
 736         *data_sent_ptr = data_sent;
 737         *iov_offset_ptr = iov_offset;
 738         return ret;
 739 }
 740
 741 static int user_sdma_send_pkts(struct user_sdma_request *req, u16 maxpkts)
 742 {
 743         int ret = 0;
 744         u16 count;
 745         unsigned npkts = 0;
 746         struct user_sdma_txreq *tx = NULL;
 747         struct hfi1_user_sdma_pkt_q *pq = NULL;
 748         struct user_sdma_iovec *iovec = NULL;
 749
 750         if (!req->pq)
 751                 return -EINVAL;
 752
 753         pq = req->pq;
 754
 755         /* If tx completion has reported an error, we are done. */
 756         if (READ_ONCE(req->has_error))
 757                 return -EFAULT;
 758
 759         /*
 760          * Check if we might have sent the entire request already
 761          */
 762         if (unlikely(req->seqnum == req->info.npkts)) {
 763                 if (!list_empty(&req->txps))
 764                         goto dosend;
 765                 return ret;
 766         }
 767
 768         if (!maxpkts || maxpkts > req->info.npkts - req->seqnum)
 769                 maxpkts = req->info.npkts - req->seqnum;
 770
 771         while (npkts < maxpkts) {
 772                 u32 datalen = 0, queued = 0, data_sent = 0;
 773                 u64 iov_offset = 0;
 774
 775                 /*
 776                  * Check whether any of the completions have come back
 777                  * with errors. If so, we are not going to process any
 778                  * more packets from this request.
 779                  */
 780                 if (READ_ONCE(req->has_error))
 781                         return -EFAULT;
 782
 783                 tx = kmem_cache_alloc(pq->txreq_cache, GFP_KERNEL);
 784                 if (!tx)
 785                         return -ENOMEM;
 786
 787                 tx->flags = 0;
 788                 tx->req = req;
 789                 INIT_LIST_HEAD(&tx->list);
 790
 791                 /*
 792                  * For the last packet set the ACK request
 793                  * and disable header suppression.
 794                  */
 795                 if (req->seqnum == req->info.npkts - 1)
 796                         tx->flags |= (TXREQ_FLAGS_REQ_ACK |
 797                                       TXREQ_FLAGS_REQ_DISABLE_SH);
 798
 799                 /*
 800                  * Calculate the payload size - this is min of the fragment
 801                  * (MTU) size or the remaining bytes in the request but only
 802                  * if we have payload data.
 803                  */
 804                 if (req->data_len) {
 805                         iovec = &req->iovs[req->iov_idx];
 806                         if (READ_ONCE(iovec->offset) == iovec->iov.iov_len) {
 807                                 if (++req->iov_idx == req->data_iovs) {
 808                                         ret = -EFAULT;
 809                                         goto free_tx;
 810                                 }
 811                                 iovec = &req->iovs[req->iov_idx];
 812                                 WARN_ON(iovec->offset);
 813                         }
 814
 815                         datalen = compute_data_length(req, tx);
 816
 817                         /*
 818                          * Disable header suppression for the payload <= 8DWS.
 819                          * If there is an uncorrectable error in the receive
 820                          * data FIFO when the received payload size is less than
 821                          * or equal to 8DWS then the RxDmaDataFifoRdUncErr is
 822                          * not reported.There is set RHF.EccErr if the header
 823                          * is not suppressed.
 824                          */
 825                         if (!datalen) {
 826                                 SDMA_DBG(req,
 827                                          "Request has data but pkt len is 0");
 828                                 ret = -EFAULT;
 829                                 goto free_tx;
 830                         } else if (datalen <= 32) {
 831                                 tx->flags |= TXREQ_FLAGS_REQ_DISABLE_SH;
 832                         }
 833                 }
 834
 835                 if (req->ahg_idx >= 0) {
 836                         if (!req->seqnum) {
 837                                 ret = user_sdma_txadd_ahg(req, tx, datalen);
 838                                 if (ret)
 839                                         goto free_tx;
 840                         } else {
 841                                 int changes;
 842
 843                                 changes = set_txreq_header_ahg(req, tx,
 844                                                                datalen);
 845                                 if (changes < 0) {
 846                                         ret = changes;
 847                                         goto free_tx;
 848                                 }
 849                         }
 850                 } else {
 851                         ret = sdma_txinit(&tx->txreq, 0, sizeof(req->hdr) +
 852                                           datalen, user_sdma_txreq_cb);
 853                         if (ret)
 854                                 goto free_tx;
 855                         /*
 856                          * Modify the header for this packet. This only needs
 857                          * to be done if we are not going to use AHG. Otherwise,
 858                          * the HW will do it based on the changes we gave it
 859                          * during sdma_txinit_ahg().
 860                          */
 861                         ret = set_txreq_header(req, tx, datalen);
 862                         if (ret)
 863                                 goto free_txreq;
 864                 }
 865
 866                 /*
 867                  * If the request contains any data vectors, add up to
 868                  * fragsize bytes to the descriptor.
 869                  */
 870                 while (queued < datalen &&
 871                        (req->sent + data_sent) < req->data_len) {
 872                         ret = user_sdma_txadd(req, tx, iovec, datalen,
 873                                               &queued, &data_sent, &iov_offset);
 874                         if (ret)
 875                                 goto free_txreq;
 876                 }
 877                 /*
 878                  * The txreq was submitted successfully so we can update
 879                  * the counters.
 880                  */
 881                 req->koffset += datalen;
 882                 if (req_opcode(req->info.ctrl) == EXPECTED)
 883                         req->tidoffset += datalen;
 884                 req->sent += data_sent;
 885                 if (req->data_len)
 886                         iovec->offset += iov_offset;
 887                 list_add_tail(&tx->txreq.list, &req->txps);
 888                 /*
 889                  * It is important to increment this here as it is used to
 890                  * generate the BTH.PSN and, therefore, can't be bulk-updated
 891                  * outside of the loop.
 892                  */
 893                 tx->seqnum = req->seqnum++;
 894                 npkts++;
 895         }
 896 dosend:
 897         ret = sdma_send_txlist(req->sde,
 898                                iowait_get_ib_work(&pq->busy),
 899                                &req->txps, &count);
 900         req->seqsubmitted += count;
 901         if (req->seqsubmitted == req->info.npkts) {
 902                 /*
 903                  * The txreq has already been submitted to the HW queue
 904                  * so we can free the AHG entry now. Corruption will not
 905                  * happen due to the sequential manner in which
 906                  * descriptors are processed.
 907                  */
 908                 if (req->ahg_idx >= 0)
 909                         sdma_ahg_free(req->sde, req->ahg_idx);
 910         }
 911         return ret;
 912
 913 free_txreq:
 914         sdma_txclean(pq->dd, &tx->txreq);
 915 free_tx:
 916         kmem_cache_free(pq->txreq_cache, tx);
 917         return ret;
 918 }
 919
 920 static u32 sdma_cache_evict(struct hfi1_user_sdma_pkt_q *pq, u32 npages)
 921 {
 922         struct evict_data evict_data;
 923
 924         evict_data.cleared = 0;
 925         evict_data.target = npages;
 926         hfi1_mmu_rb_evict(pq->handler, &evict_data);
 927         return evict_data.cleared;
 928 }
 929
 930 static int pin_sdma_pages(struct user_sdma_request *req,
 931                           struct user_sdma_iovec *iovec,
 932                           struct sdma_mmu_node *node,
 933                           int npages)
 934 {
 935         int pinned, cleared;
 936         struct page **pages;
 937         struct hfi1_user_sdma_pkt_q *pq = req->pq;
 938
 939         pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
 940         if (!pages)
 941                 return -ENOMEM;
 942         memcpy(pages, node->pages, node->npages * sizeof(*pages));
 943
 944         npages -= node->npages;
 945 retry:
 946         if (!hfi1_can_pin_pages(pq->dd, current->mm,
 947                                 atomic_read(&pq->n_locked), npages)) {
 948                 cleared = sdma_cache_evict(pq, npages);
 949                 if (cleared >= npages)
 950                         goto retry;
 951         }
 952         pinned = hfi1_acquire_user_pages(current->mm,
 953                                          ((unsigned long)iovec->iov.iov_base +
 954                                          (node->npages * PAGE_SIZE)), npages, 0,
 955                                          pages + node->npages);
 956         if (pinned < 0) {
 957                 kfree(pages);
 958                 return pinned;
 959         }
 960         if (pinned != npages) {
 961                 unpin_vector_pages(current->mm, pages, node->npages, pinned);
 962                 return -EFAULT;
 963         }
 964         kfree(node->pages);
 965         node->rb.len = iovec->iov.iov_len;
 966         node->pages = pages;
 967         atomic_add(pinned, &pq->n_locked);
 968         return pinned;
 969 }
 970
 971 static void unpin_sdma_pages(struct sdma_mmu_node *node)
 972 {
 973         if (node->npages) {
 974                 unpin_vector_pages(mm_from_sdma_node(node), node->pages, 0,
 975                                    node->npages);
 976                 atomic_sub(node->npages, &node->pq->n_locked);
 977         }
 978 }
 979
 980 static int pin_vector_pages(struct user_sdma_request *req,
 981                             struct user_sdma_iovec *iovec)
 982 {
 983         int ret = 0, pinned, npages;
 984         struct hfi1_user_sdma_pkt_q *pq = req->pq;
 985         struct sdma_mmu_node *node = NULL;
 986         struct mmu_rb_node *rb_node;
 987         struct iovec *iov;
 988         bool extracted;
 989
 990         extracted =
 991                 hfi1_mmu_rb_remove_unless_exact(pq->handler,
 992                                                 (unsigned long)
 993                                                 iovec->iov.iov_base,
 994                                                 iovec->iov.iov_len, &rb_node);
 995         if (rb_node) {
 996                 node = container_of(rb_node, struct sdma_mmu_node, rb);
 997                 if (!extracted) {
 998                         atomic_inc(&node->refcount);
 999                         iovec->pages = node->pages;
1000                         iovec->npages = node->npages;
1001                         iovec->node = node;
1002                         return 0;
1003                 }
1004         }
1005
1006         if (!node) {
1007                 node = kzalloc(sizeof(*node), GFP_KERNEL);
1008                 if (!node)
1009                         return -ENOMEM;
1010
1011                 node->rb.addr = (unsigned long)iovec->iov.iov_base;
1012                 node->pq = pq;
1013                 atomic_set(&node->refcount, 0);
1014         }
1015
1016         iov = &iovec->iov;
1017         npages = num_user_pages((unsigned long)iov->iov_base, iov->iov_len);
1018         if (node->npages < npages) {
1019                 pinned = pin_sdma_pages(req, iovec, node, npages);
1020                 if (pinned < 0) {
1021                         ret = pinned;
1022                         goto bail;
1023                 }
1024                 node->npages += pinned;
1025                 npages = node->npages;
1026         }
1027         iovec->pages = node->pages;
1028         iovec->npages = npages;
1029         iovec->node = node;
1030
1031         ret = hfi1_mmu_rb_insert(req->pq->handler, &node->rb);
1032         if (ret) {
1033                 iovec->node = NULL;
1034                 goto bail;
1035         }
1036         return 0;
1037 bail:
1038         unpin_sdma_pages(node);
1039         kfree(node);
1040         return ret;
1041 }
1042
1043 static void unpin_vector_pages(struct mm_struct *mm, struct page **pages,
1044                                unsigned start, unsigned npages)
1045 {
1046         hfi1_release_user_pages(mm, pages + start, npages, false);
1047         kfree(pages);
1048 }
1049
1050 static int check_header_template(struct user_sdma_request *req,
1051                                  struct hfi1_pkt_header *hdr, u32 lrhlen,
1052                                  u32 datalen)
1053 {
1054         /*
1055          * Perform safety checks for any type of packet:
1056          *    - transfer size is multiple of 64bytes
1057          *    - packet length is multiple of 4 bytes
1058          *    - packet length is not larger than MTU size
1059          *
1060          * These checks are only done for the first packet of the
1061          * transfer since the header is "given" to us by user space.
1062          * For the remainder of the packets we compute the values.
1063          */
1064         if (req->info.fragsize % PIO_BLOCK_SIZE || lrhlen & 0x3 ||
1065             lrhlen > get_lrh_len(*hdr, req->info.fragsize))
1066                 return -EINVAL;
1067
1068         if (req_opcode(req->info.ctrl) == EXPECTED) {
1069                 /*
1070                  * The header is checked only on the first packet. Furthermore,
1071                  * we ensure that at least one TID entry is copied when the
1072                  * request is submitted. Therefore, we don't have to verify that
1073                  * tididx points to something sane.
1074                  */
1075                 u32 tidval = req->tids[req->tididx],
1076                         tidlen = EXP_TID_GET(tidval, LEN) * PAGE_SIZE,
1077                         tididx = EXP_TID_GET(tidval, IDX),
1078                         tidctrl = EXP_TID_GET(tidval, CTRL),
1079                         tidoff;
1080                 __le32 kval = hdr->kdeth.ver_tid_offset;
1081
1082                 tidoff = KDETH_GET(kval, OFFSET) *
1083                           (KDETH_GET(req->hdr.kdeth.ver_tid_offset, OM) ?
1084                            KDETH_OM_LARGE : KDETH_OM_SMALL);
1085                 /*
1086                  * Expected receive packets have the following
1087                  * additional checks:
1088                  *     - offset is not larger than the TID size
1089                  *     - TIDCtrl values match between header and TID array
1090                  *     - TID indexes match between header and TID array
1091                  */
1092                 if ((tidoff + datalen > tidlen) ||
1093                     KDETH_GET(kval, TIDCTRL) != tidctrl ||
1094                     KDETH_GET(kval, TID) != tididx)
1095                         return -EINVAL;
1096         }
1097         return 0;
1098 }
1099
1100 /*
1101  * Correctly set the BTH.PSN field based on type of
1102  * transfer - eager packets can just increment the PSN but
1103  * expected packets encode generation and sequence in the
1104  * BTH.PSN field so just incrementing will result in errors.
1105  */
1106 static inline u32 set_pkt_bth_psn(__be32 bthpsn, u8 expct, u32 frags)
1107 {
1108         u32 val = be32_to_cpu(bthpsn),
1109                 mask = (HFI1_CAP_IS_KSET(EXTENDED_PSN) ? 0x7fffffffull :
1110                         0xffffffull),
1111                 psn = val & mask;
1112         if (expct)
1113                 psn = (psn & ~HFI1_KDETH_BTH_SEQ_MASK) |
1114                         ((psn + frags) & HFI1_KDETH_BTH_SEQ_MASK);
1115         else
1116                 psn = psn + frags;
1117         return psn & mask;
1118 }
1119
1120 static int set_txreq_header(struct user_sdma_request *req,
1121                             struct user_sdma_txreq *tx, u32 datalen)
1122 {
1123         struct hfi1_user_sdma_pkt_q *pq = req->pq;
1124         struct hfi1_pkt_header *hdr = &tx->hdr;
1125         u8 omfactor; /* KDETH.OM */
1126         u16 pbclen;
1127         int ret;
1128         u32 tidval = 0, lrhlen = get_lrh_len(*hdr, pad_len(datalen));
1129
1130         /* Copy the header template to the request before modification */
1131         memcpy(hdr, &req->hdr, sizeof(*hdr));
1132
1133         /*
1134          * Check if the PBC and LRH length are mismatched. If so
1135          * adjust both in the header.
1136          */
1137         pbclen = le16_to_cpu(hdr->pbc[0]);
1138         if (PBC2LRH(pbclen) != lrhlen) {
1139                 pbclen = (pbclen & 0xf000) | LRH2PBC(lrhlen);
1140                 hdr->pbc[0] = cpu_to_le16(pbclen);
1141                 hdr->lrh[2] = cpu_to_be16(lrhlen >> 2);
1142                 /*
1143                  * Third packet
1144                  * This is the first packet in the sequence that has
1145                  * a "static" size that can be used for the rest of
1146                  * the packets (besides the last one).
1147                  */
1148                 if (unlikely(req->seqnum == 2)) {
1149                         /*
1150                          * From this point on the lengths in both the
1151                          * PBC and LRH are the same until the last
1152                          * packet.
1153                          * Adjust the template so we don't have to update
1154                          * every packet
1155                          */
1156                         req->hdr.pbc[0] = hdr->pbc[0];
1157                         req->hdr.lrh[2] = hdr->lrh[2];
1158                 }
1159         }
1160         /*
1161          * We only have to modify the header if this is not the
1162          * first packet in the request. Otherwise, we use the
1163          * header given to us.
1164          */
1165         if (unlikely(!req->seqnum)) {
1166                 ret = check_header_template(req, hdr, lrhlen, datalen);
1167                 if (ret)
1168                         return ret;
1169                 goto done;
1170         }
1171
1172         hdr->bth[2] = cpu_to_be32(
1173                 set_pkt_bth_psn(hdr->bth[2],
1174                                 (req_opcode(req->info.ctrl) == EXPECTED),
1175                                 req->seqnum));
1176
1177         /* Set ACK request on last packet */
1178         if (unlikely(tx->flags & TXREQ_FLAGS_REQ_ACK))
1179                 hdr->bth[2] |= cpu_to_be32(1UL << 31);
1180
1181         /* Set the new offset */
1182         hdr->kdeth.swdata[6] = cpu_to_le32(req->koffset);
1183         /* Expected packets have to fill in the new TID information */
1184         if (req_opcode(req->info.ctrl) == EXPECTED) {
1185                 tidval = req->tids[req->tididx];
1186                 /*
1187                  * If the offset puts us at the end of the current TID,
1188                  * advance everything.
1189                  */
1190                 if ((req->tidoffset) == (EXP_TID_GET(tidval, LEN) *
1191                                          PAGE_SIZE)) {
1192                         req->tidoffset = 0;
1193                         /*
1194                          * Since we don't copy all the TIDs, all at once,
1195                          * we have to check again.
1196                          */
1197                         if (++req->tididx > req->n_tids - 1 ||
1198                             !req->tids[req->tididx]) {
1199                                 return -EINVAL;
1200                         }
1201                         tidval = req->tids[req->tididx];
1202                 }
1203                 omfactor = EXP_TID_GET(tidval, LEN) * PAGE_SIZE >=
1204                         KDETH_OM_MAX_SIZE ? KDETH_OM_LARGE_SHIFT :
1205                         KDETH_OM_SMALL_SHIFT;
1206                 /* Set KDETH.TIDCtrl based on value for this TID. */
1207                 KDETH_SET(hdr->kdeth.ver_tid_offset, TIDCTRL,
1208                           EXP_TID_GET(tidval, CTRL));
1209                 /* Set KDETH.TID based on value for this TID */
1210                 KDETH_SET(hdr->kdeth.ver_tid_offset, TID,
1211                           EXP_TID_GET(tidval, IDX));
1212                 /* Clear KDETH.SH when DISABLE_SH flag is set */
1213                 if (unlikely(tx->flags & TXREQ_FLAGS_REQ_DISABLE_SH))
1214                         KDETH_SET(hdr->kdeth.ver_tid_offset, SH, 0);
1215                 /*
1216                  * Set the KDETH.OFFSET and KDETH.OM based on size of
1217                  * transfer.
1218                  */
1219                 trace_hfi1_sdma_user_tid_info(
1220                         pq->dd, pq->ctxt, pq->subctxt, req->info.comp_idx,
1221                         req->tidoffset, req->tidoffset >> omfactor,
1222                         omfactor != KDETH_OM_SMALL_SHIFT);
1223                 KDETH_SET(hdr->kdeth.ver_tid_offset, OFFSET,
1224                           req->tidoffset >> omfactor);
1225                 KDETH_SET(hdr->kdeth.ver_tid_offset, OM,
1226                           omfactor != KDETH_OM_SMALL_SHIFT);
1227         }
1228 done:
1229         trace_hfi1_sdma_user_header(pq->dd, pq->ctxt, pq->subctxt,
1230                                     req->info.comp_idx, hdr, tidval);
1231         return sdma_txadd_kvaddr(pq->dd, &tx->txreq, hdr, sizeof(*hdr));
1232 }
1233
1234 static int set_txreq_header_ahg(struct user_sdma_request *req,
1235                                 struct user_sdma_txreq *tx, u32 datalen)
1236 {
1237         u32 ahg[AHG_KDETH_ARRAY_SIZE];
1238         int idx = 0;
1239         u8 omfactor; /* KDETH.OM */
1240         struct hfi1_user_sdma_pkt_q *pq = req->pq;
1241         struct hfi1_pkt_header *hdr = &req->hdr;
1242         u16 pbclen = le16_to_cpu(hdr->pbc[0]);
1243         u32 val32, tidval = 0, lrhlen = get_lrh_len(*hdr, pad_len(datalen));
1244         size_t array_size = ARRAY_SIZE(ahg);
1245
1246         if (PBC2LRH(pbclen) != lrhlen) {
1247                 /* PBC.PbcLengthDWs */
1248                 idx = ahg_header_set(ahg, idx, array_size, 0, 0, 12,
1249                                      (__force u16)cpu_to_le16(LRH2PBC(lrhlen)));
1250                 if (idx < 0)
1251                         return idx;
1252                 /* LRH.PktLen (we need the full 16 bits due to byte swap) */
1253                 idx = ahg_header_set(ahg, idx, array_size, 3, 0, 16,
1254                                      (__force u16)cpu_to_be16(lrhlen >> 2));
1255                 if (idx < 0)
1256                         return idx;
1257         }
1258
1259         /*
1260          * Do the common updates
1261          */
1262         /* BTH.PSN and BTH.A */
1263         val32 = (be32_to_cpu(hdr->bth[2]) + req->seqnum) &
1264                 (HFI1_CAP_IS_KSET(EXTENDED_PSN) ? 0x7fffffff : 0xffffff);
1265         if (unlikely(tx->flags & TXREQ_FLAGS_REQ_ACK))
1266                 val32 |= 1UL << 31;
1267         idx = ahg_header_set(ahg, idx, array_size, 6, 0, 16,
1268                              (__force u16)cpu_to_be16(val32 >> 16));
1269         if (idx < 0)
1270                 return idx;
1271         idx = ahg_header_set(ahg, idx, array_size, 6, 16, 16,
1272                              (__force u16)cpu_to_be16(val32 & 0xffff));
1273         if (idx < 0)
1274                 return idx;
1275         /* KDETH.Offset */
1276         idx = ahg_header_set(ahg, idx, array_size, 15, 0, 16,
1277                              (__force u16)cpu_to_le16(req->koffset & 0xffff));
1278         if (idx < 0)
1279                 return idx;
1280         idx = ahg_header_set(ahg, idx, array_size, 15, 16, 16,
1281                              (__force u16)cpu_to_le16(req->koffset >> 16));
1282         if (idx < 0)
1283                 return idx;
1284         if (req_opcode(req->info.ctrl) == EXPECTED) {
1285                 __le16 val;
1286
1287                 tidval = req->tids[req->tididx];
1288
1289                 /*
1290                  * If the offset puts us at the end of the current TID,
1291                  * advance everything.
1292                  */
1293                 if ((req->tidoffset) == (EXP_TID_GET(tidval, LEN) *
1294                                          PAGE_SIZE)) {
1295                         req->tidoffset = 0;
1296                         /*
1297                          * Since we don't copy all the TIDs, all at once,
1298                          * we have to check again.
1299                          */
1300                         if (++req->tididx > req->n_tids - 1 ||
1301                             !req->tids[req->tididx])
1302                                 return -EINVAL;
1303                         tidval = req->tids[req->tididx];
1304                 }
1305                 omfactor = ((EXP_TID_GET(tidval, LEN) *
1306                                   PAGE_SIZE) >=
1307                                  KDETH_OM_MAX_SIZE) ? KDETH_OM_LARGE_SHIFT :
1308                                  KDETH_OM_SMALL_SHIFT;
1309                 /* KDETH.OM and KDETH.OFFSET (TID) */
1310                 idx = ahg_header_set(
1311                                 ahg, idx, array_size, 7, 0, 16,
1312                                 ((!!(omfactor - KDETH_OM_SMALL_SHIFT)) << 15 |
1313                                 ((req->tidoffset >> omfactor)
1314                                 & 0x7fff)));
1315                 if (idx < 0)
1316                         return idx;
1317                 /* KDETH.TIDCtrl, KDETH.TID, KDETH.Intr, KDETH.SH */
1318                 val = cpu_to_le16(((EXP_TID_GET(tidval, CTRL) & 0x3) << 10) |
1319                                    (EXP_TID_GET(tidval, IDX) & 0x3ff));
1320
1321                 if (unlikely(tx->flags & TXREQ_FLAGS_REQ_DISABLE_SH)) {
1322                         val |= cpu_to_le16((KDETH_GET(hdr->kdeth.ver_tid_offset,
1323                                                       INTR) <<
1324                                             AHG_KDETH_INTR_SHIFT));
1325                 } else {
1326                         val |= KDETH_GET(hdr->kdeth.ver_tid_offset, SH) ?
1327                                cpu_to_le16(0x1 << AHG_KDETH_SH_SHIFT) :
1328                                cpu_to_le16((KDETH_GET(hdr->kdeth.ver_tid_offset,
1329                                                       INTR) <<
1330                                              AHG_KDETH_INTR_SHIFT));
1331                 }
1332
1333                 idx = ahg_header_set(ahg, idx, array_size,
1334                                      7, 16, 14, (__force u16)val);
1335                 if (idx < 0)
1336                         return idx;
1337         }
1338
1339         trace_hfi1_sdma_user_header_ahg(pq->dd, pq->ctxt, pq->subctxt,
1340                                         req->info.comp_idx, req->sde->this_idx,
1341                                         req->ahg_idx, ahg, idx, tidval);
1342         sdma_txinit_ahg(&tx->txreq,
1343                         SDMA_TXREQ_F_USE_AHG,
1344                         datalen, req->ahg_idx, idx,
1345                         ahg, sizeof(req->hdr),
1346                         user_sdma_txreq_cb);
1347
1348         return idx;
1349 }
1350
1351 /**
1352  * user_sdma_txreq_cb() - SDMA tx request completion callback.
1353  * @txreq: valid sdma tx request
1354  * @status: success/failure of request
1355  *
1356  * Called when the SDMA progress state machine gets notification that
1357  * the SDMA descriptors for this tx request have been processed by the
1358  * DMA engine. Called in interrupt context.
1359  * Only do work on completed sequences.
1360  */
1361 static void user_sdma_txreq_cb(struct sdma_txreq *txreq, int status)
1362 {
1363         struct user_sdma_txreq *tx =
1364                 container_of(txreq, struct user_sdma_txreq, txreq);
1365         struct user_sdma_request *req;
1366         struct hfi1_user_sdma_pkt_q *pq;
1367         struct hfi1_user_sdma_comp_q *cq;
1368         enum hfi1_sdma_comp_state state = COMPLETE;
1369
1370         if (!tx->req)
1371                 return;
1372
1373         req = tx->req;
1374         pq = req->pq;
1375         cq = req->cq;
1376
1377         if (status != SDMA_TXREQ_S_OK) {
1378                 SDMA_DBG(req, "SDMA completion with error %d",
1379                          status);
1380                 WRITE_ONCE(req->has_error, 1);
1381                 state = ERROR;
1382         }
1383
1384         req->seqcomp = tx->seqnum;
1385         kmem_cache_free(pq->txreq_cache, tx);
1386
1387         /* sequence isn't complete?  We are done */
1388         if (req->seqcomp != req->info.npkts - 1)
1389                 return;
1390
1391         user_sdma_free_request(req, false);
1392         set_comp_state(pq, cq, req->info.comp_idx, state, status);
1393         pq_update(pq);
1394 }
1395
1396 static inline void pq_update(struct hfi1_user_sdma_pkt_q *pq)
1397 {
1398         if (atomic_dec_and_test(&pq->n_reqs))
1399                 wake_up(&pq->wait);
1400 }
1401
1402 static void user_sdma_free_request(struct user_sdma_request *req, bool unpin)
1403 {
1404         int i;
1405
1406         if (!list_empty(&req->txps)) {
1407                 struct sdma_txreq *t, *p;
1408
1409                 list_for_each_entry_safe(t, p, &req->txps, list) {
1410                         struct user_sdma_txreq *tx =
1411                                 container_of(t, struct user_sdma_txreq, txreq);
1412                         list_del_init(&t->list);
1413                         sdma_txclean(req->pq->dd, t);
1414                         kmem_cache_free(req->pq->txreq_cache, tx);
1415                 }
1416         }
1417
1418         for (i = 0; i < req->data_iovs; i++) {
1419                 struct sdma_mmu_node *node = req->iovs[i].node;
1420
1421                 if (!node)
1422                         continue;
1423
1424                 req->iovs[i].node = NULL;
1425
1426                 if (unpin)
1427                         hfi1_mmu_rb_remove(req->pq->handler,
1428                                            &node->rb);
1429                 else
1430                         atomic_dec(&node->refcount);
1431         }
1432
1433         kfree(req->tids);
1434         clear_bit(req->info.comp_idx, req->pq->req_in_use);
1435 }
1436
1437 static inline void set_comp_state(struct hfi1_user_sdma_pkt_q *pq,
1438                                   struct hfi1_user_sdma_comp_q *cq,
1439                                   u16 idx, enum hfi1_sdma_comp_state state,
1440                                   int ret)
1441 {
1442         if (state == ERROR)
1443                 cq->comps[idx].errcode = -ret;
1444         smp_wmb(); /* make sure errcode is visible first */
1445         cq->comps[idx].status = state;
1446         trace_hfi1_sdma_user_completion(pq->dd, pq->ctxt, pq->subctxt,
1447                                         idx, state, ret);
1448 }
1449
1450 static bool sdma_rb_filter(struct mmu_rb_node *node, unsigned long addr,
1451                            unsigned long len)
1452 {
1453         return (bool)(node->addr == addr);
1454 }
1455
1456 static int sdma_rb_insert(void *arg, struct mmu_rb_node *mnode)
1457 {
1458         struct sdma_mmu_node *node =
1459                 container_of(mnode, struct sdma_mmu_node, rb);
1460
1461         atomic_inc(&node->refcount);
1462         return 0;
1463 }
1464
1465 /*
1466  * Return 1 to remove the node from the rb tree and call the remove op.
1467  *
1468  * Called with the rb tree lock held.
1469  */
1470 static int sdma_rb_evict(void *arg, struct mmu_rb_node *mnode,
1471                          void *evict_arg, bool *stop)
1472 {
1473         struct sdma_mmu_node *node =
1474                 container_of(mnode, struct sdma_mmu_node, rb);
1475         struct evict_data *evict_data = evict_arg;
1476
1477         /* is this node still being used? */
1478         if (atomic_read(&node->refcount))
1479                 return 0; /* keep this node */
1480
1481         /* this node will be evicted, add its pages to our count */
1482         evict_data->cleared += node->npages;
1483
1484         /* have enough pages been cleared? */
1485         if (evict_data->cleared >= evict_data->target)
1486                 *stop = true;
1487
1488         return 1; /* remove this node */
1489 }
1490
1491 static void sdma_rb_remove(void *arg, struct mmu_rb_node *mnode)
1492 {
1493         struct sdma_mmu_node *node =
1494                 container_of(mnode, struct sdma_mmu_node, rb);
1495
1496         unpin_sdma_pages(node);
1497         kfree(node);
1498 }
1499
1500 static int sdma_rb_invalidate(void *arg, struct mmu_rb_node *mnode)
1501 {
1502         struct sdma_mmu_node *node =
1503                 container_of(mnode, struct sdma_mmu_node, rb);
1504
1505         if (!atomic_read(&node->refcount))
1506                 return 1;
1507         return 0;
1508 }