drivers/infiniband/hw/hfi1/user_sdma.c

   1 /*
   2  * Copyright(c) 2020 - Cornelis Networks, Inc.
   3  * Copyright(c) 2015 - 2018 Intel Corporation.
   4  *
   5  * This file is provided under a dual BSD/GPLv2 license.  When using or
   6  * redistributing this file, you may do so under either license.
   7  *
   8  * GPL LICENSE SUMMARY
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * BSD LICENSE
  20  *
  21  * Redistribution and use in source and binary forms, with or without
  22  * modification, are permitted provided that the following conditions
  23  * are met:
  24  *
  25  *  - Redistributions of source code must retain the above copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  *  - Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in
  29  *    the documentation and/or other materials provided with the
  30  *    distribution.
  31  *  - Neither the name of Intel Corporation nor the names of its
  32  *    contributors may be used to endorse or promote products derived
  33  *    from this software without specific prior written permission.
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  36  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  37  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  38  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  39  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  41  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  42  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  43  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  44  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  45  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  46  *
  47  */
  48 #include <linux/mm.h>
  49 #include <linux/types.h>
  50 #include <linux/device.h>
  51 #include <linux/dmapool.h>
  52 #include <linux/slab.h>
  53 #include <linux/list.h>
  54 #include <linux/highmem.h>
  55 #include <linux/io.h>
  56 #include <linux/uio.h>
  57 #include <linux/rbtree.h>
  58 #include <linux/spinlock.h>
  59 #include <linux/delay.h>
  60 #include <linux/kthread.h>
  61 #include <linux/mmu_context.h>
  62 #include <linux/module.h>
  63 #include <linux/vmalloc.h>
  64 #include <linux/string.h>
  65
  66 #include "hfi.h"
  67 #include "sdma.h"
  68 #include "mmu_rb.h"
  69 #include "user_sdma.h"
  70 #include "verbs.h"  /* for the headers */
  71 #include "common.h" /* for struct hfi1_tid_info */
  72 #include "trace.h"
  73
  74 static uint hfi1_sdma_comp_ring_size = 128;
  75 module_param_named(sdma_comp_size, hfi1_sdma_comp_ring_size, uint, S_IRUGO);
  76 MODULE_PARM_DESC(sdma_comp_size, "Size of User SDMA completion ring. Default: 128");
  77
  78 static unsigned initial_pkt_count = 8;
  79
  80 static int user_sdma_send_pkts(struct user_sdma_request *req, u16 maxpkts);
  81 static void user_sdma_txreq_cb(struct sdma_txreq *txreq, int status);
  82 static inline void pq_update(struct hfi1_user_sdma_pkt_q *pq);
  83 static void user_sdma_free_request(struct user_sdma_request *req, bool unpin);
  84 static int pin_vector_pages(struct user_sdma_request *req,
  85                             struct user_sdma_iovec *iovec);
  86 static void unpin_vector_pages(struct mm_struct *mm, struct page **pages,
  87                                unsigned start, unsigned npages);
  88 static int check_header_template(struct user_sdma_request *req,
  89                                  struct hfi1_pkt_header *hdr, u32 lrhlen,
  90                                  u32 datalen);
  91 static int set_txreq_header(struct user_sdma_request *req,
  92                             struct user_sdma_txreq *tx, u32 datalen);
  93 static int set_txreq_header_ahg(struct user_sdma_request *req,
  94                                 struct user_sdma_txreq *tx, u32 len);
  95 static inline void set_comp_state(struct hfi1_user_sdma_pkt_q *pq,
  96                                   struct hfi1_user_sdma_comp_q *cq,
  97                                   u16 idx, enum hfi1_sdma_comp_state state,
  98                                   int ret);
  99 static inline u32 set_pkt_bth_psn(__be32 bthpsn, u8 expct, u32 frags);
 100 static inline u32 get_lrh_len(struct hfi1_pkt_header, u32 len);
 101
 102 static int defer_packet_queue(
 103         struct sdma_engine *sde,
 104         struct iowait_work *wait,
 105         struct sdma_txreq *txreq,
 106         uint seq,
 107         bool pkts_sent);
 108 static void activate_packet_queue(struct iowait *wait, int reason);
 109 static bool sdma_rb_filter(struct mmu_rb_node *node, unsigned long addr,
 110                            unsigned long len);
 111 static int sdma_rb_insert(void *arg, struct mmu_rb_node *mnode);
 112 static int sdma_rb_evict(void *arg, struct mmu_rb_node *mnode,
 113                          void *arg2, bool *stop);
 114 static void sdma_rb_remove(void *arg, struct mmu_rb_node *mnode);
 115 static int sdma_rb_invalidate(void *arg, struct mmu_rb_node *mnode);
 116
 117 static struct mmu_rb_ops sdma_rb_ops = {
 118         .filter = sdma_rb_filter,
 119         .insert = sdma_rb_insert,
 120         .evict = sdma_rb_evict,
 121         .remove = sdma_rb_remove,
 122         .invalidate = sdma_rb_invalidate
 123 };
 124
 125 static int defer_packet_queue(
 126         struct sdma_engine *sde,
 127         struct iowait_work *wait,
 128         struct sdma_txreq *txreq,
 129         uint seq,
 130         bool pkts_sent)
 131 {
 132         struct hfi1_user_sdma_pkt_q *pq =
 133                 container_of(wait->iow, struct hfi1_user_sdma_pkt_q, busy);
 134
 135         write_seqlock(&sde->waitlock);
 136         if (sdma_progress(sde, seq, txreq))
 137                 goto eagain;
 138         /*
 139          * We are assuming that if the list is enqueued somewhere, it
 140          * is to the dmawait list since that is the only place where
 141          * it is supposed to be enqueued.
 142          */
 143         xchg(&pq->state, SDMA_PKT_Q_DEFERRED);
 144         if (list_empty(&pq->busy.list)) {
 145                 pq->busy.lock = &sde->waitlock;
 146                 iowait_get_priority(&pq->busy);
 147                 iowait_queue(pkts_sent, &pq->busy, &sde->dmawait);
 148         }
 149         write_sequnlock(&sde->waitlock);
 150         return -EBUSY;
 151 eagain:
 152         write_sequnlock(&sde->waitlock);
 153         return -EAGAIN;
 154 }
 155
 156 static void activate_packet_queue(struct iowait *wait, int reason)
 157 {
 158         struct hfi1_user_sdma_pkt_q *pq =
 159                 container_of(wait, struct hfi1_user_sdma_pkt_q, busy);
 160         pq->busy.lock = NULL;
 161         xchg(&pq->state, SDMA_PKT_Q_ACTIVE);
 162         wake_up(&wait->wait_dma);
 163 };
 164
 165 int hfi1_user_sdma_alloc_queues(struct hfi1_ctxtdata *uctxt,
 166                                 struct hfi1_filedata *fd)
 167 {
 168         int ret = -ENOMEM;
 169         char buf[64];
 170         struct hfi1_devdata *dd;
 171         struct hfi1_user_sdma_comp_q *cq;
 172         struct hfi1_user_sdma_pkt_q *pq;
 173
 174         if (!uctxt || !fd)
 175                 return -EBADF;
 176
 177         if (!hfi1_sdma_comp_ring_size)
 178                 return -EINVAL;
 179
 180         dd = uctxt->dd;
 181
 182         pq = kzalloc(sizeof(*pq), GFP_KERNEL);
 183         if (!pq)
 184                 return -ENOMEM;
 185         pq->dd = dd;
 186         pq->ctxt = uctxt->ctxt;
 187         pq->subctxt = fd->subctxt;
 188         pq->n_max_reqs = hfi1_sdma_comp_ring_size;
 189         atomic_set(&pq->n_reqs, 0);
 190         init_waitqueue_head(&pq->wait);
 191         atomic_set(&pq->n_locked, 0);
 192
 193         iowait_init(&pq->busy, 0, NULL, NULL, defer_packet_queue,
 194                     activate_packet_queue, NULL, NULL);
 195         pq->reqidx = 0;
 196
 197         pq->reqs = kcalloc(hfi1_sdma_comp_ring_size,
 198                            sizeof(*pq->reqs),
 199                            GFP_KERNEL);
 200         if (!pq->reqs)
 201                 goto pq_reqs_nomem;
 202
 203         pq->req_in_use = kcalloc(BITS_TO_LONGS(hfi1_sdma_comp_ring_size),
 204                                  sizeof(*pq->req_in_use),
 205                                  GFP_KERNEL);
 206         if (!pq->req_in_use)
 207                 goto pq_reqs_no_in_use;
 208
 209         snprintf(buf, 64, "txreq-kmem-cache-%u-%u-%u", dd->unit, uctxt->ctxt,
 210                  fd->subctxt);
 211         pq->txreq_cache = kmem_cache_create(buf,
 212                                             sizeof(struct user_sdma_txreq),
 213                                             L1_CACHE_BYTES,
 214                                             SLAB_HWCACHE_ALIGN,
 215                                             NULL);
 216         if (!pq->txreq_cache) {
 217                 dd_dev_err(dd, "[%u] Failed to allocate TxReq cache\n",
 218                            uctxt->ctxt);
 219                 goto pq_txreq_nomem;
 220         }
 221
 222         cq = kzalloc(sizeof(*cq), GFP_KERNEL);
 223         if (!cq)
 224                 goto cq_nomem;
 225
 226         cq->comps = vmalloc_user(PAGE_ALIGN(sizeof(*cq->comps)
 227                                  * hfi1_sdma_comp_ring_size));
 228         if (!cq->comps)
 229                 goto cq_comps_nomem;
 230
 231         cq->nentries = hfi1_sdma_comp_ring_size;
 232
 233         ret = hfi1_mmu_rb_register(pq, &sdma_rb_ops, dd->pport->hfi1_wq,
 234                                    &pq->handler);
 235         if (ret) {
 236                 dd_dev_err(dd, "Failed to register with MMU %d", ret);
 237                 goto pq_mmu_fail;
 238         }
 239
 240         rcu_assign_pointer(fd->pq, pq);
 241         fd->cq = cq;
 242
 243         return 0;
 244
 245 pq_mmu_fail:
 246         vfree(cq->comps);
 247 cq_comps_nomem:
 248         kfree(cq);
 249 cq_nomem:
 250         kmem_cache_destroy(pq->txreq_cache);
 251 pq_txreq_nomem:
 252         kfree(pq->req_in_use);
 253 pq_reqs_no_in_use:
 254         kfree(pq->reqs);
 255 pq_reqs_nomem:
 256         kfree(pq);
 257
 258         return ret;
 259 }
 260
 261 static void flush_pq_iowait(struct hfi1_user_sdma_pkt_q *pq)
 262 {
 263         unsigned long flags;
 264         seqlock_t *lock = pq->busy.lock;
 265
 266         if (!lock)
 267                 return;
 268         write_seqlock_irqsave(lock, flags);
 269         if (!list_empty(&pq->busy.list)) {
 270                 list_del_init(&pq->busy.list);
 271                 pq->busy.lock = NULL;
 272         }
 273         write_sequnlock_irqrestore(lock, flags);
 274 }
 275
 276 int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd,
 277                                struct hfi1_ctxtdata *uctxt)
 278 {
 279         struct hfi1_user_sdma_pkt_q *pq;
 280
 281         trace_hfi1_sdma_user_free_queues(uctxt->dd, uctxt->ctxt, fd->subctxt);
 282
 283         spin_lock(&fd->pq_rcu_lock);
 284         pq = srcu_dereference_check(fd->pq, &fd->pq_srcu,
 285                                     lockdep_is_held(&fd->pq_rcu_lock));
 286         if (pq) {
 287                 rcu_assign_pointer(fd->pq, NULL);
 288                 spin_unlock(&fd->pq_rcu_lock);
 289                 synchronize_srcu(&fd->pq_srcu);
 290                 /* at this point there can be no more new requests */
 291                 if (pq->handler)
 292                         hfi1_mmu_rb_unregister(pq->handler);
 293                 iowait_sdma_drain(&pq->busy);
 294                 /* Wait until all requests have been freed. */
 295                 wait_event_interruptible(
 296                         pq->wait,
 297                         !atomic_read(&pq->n_reqs));
 298                 kfree(pq->reqs);
 299                 kfree(pq->req_in_use);
 300                 kmem_cache_destroy(pq->txreq_cache);
 301                 flush_pq_iowait(pq);
 302                 kfree(pq);
 303         } else {
 304                 spin_unlock(&fd->pq_rcu_lock);
 305         }
 306         if (fd->cq) {
 307                 vfree(fd->cq->comps);
 308                 kfree(fd->cq);
 309                 fd->cq = NULL;
 310         }
 311         return 0;
 312 }
 313
 314 static u8 dlid_to_selector(u16 dlid)
 315 {
 316         static u8 mapping[256];
 317         static int initialized;
 318         static u8 next;
 319         int hash;
 320
 321         if (!initialized) {
 322                 memset(mapping, 0xFF, 256);
 323                 initialized = 1;
 324         }
 325
 326         hash = ((dlid >> 8) ^ dlid) & 0xFF;
 327         if (mapping[hash] == 0xFF) {
 328                 mapping[hash] = next;
 329                 next = (next + 1) & 0x7F;
 330         }
 331
 332         return mapping[hash];
 333 }
 334
 335 /**
 336  * hfi1_user_sdma_process_request() - Process and start a user sdma request
 337  * @fd: valid file descriptor
 338  * @iovec: array of io vectors to process
 339  * @dim: overall iovec array size
 340  * @count: number of io vector array entries processed
 341  */
 342 int hfi1_user_sdma_process_request(struct hfi1_filedata *fd,
 343                                    struct iovec *iovec, unsigned long dim,
 344                                    unsigned long *count)
 345 {
 346         int ret = 0, i;
 347         struct hfi1_ctxtdata *uctxt = fd->uctxt;
 348         struct hfi1_user_sdma_pkt_q *pq =
 349                 srcu_dereference(fd->pq, &fd->pq_srcu);
 350         struct hfi1_user_sdma_comp_q *cq = fd->cq;
 351         struct hfi1_devdata *dd = pq->dd;
 352         unsigned long idx = 0;
 353         u8 pcount = initial_pkt_count;
 354         struct sdma_req_info info;
 355         struct user_sdma_request *req;
 356         u8 opcode, sc, vl;
 357         u16 pkey;
 358         u32 slid;
 359         u16 dlid;
 360         u32 selector;
 361
 362         if (iovec[idx].iov_len < sizeof(info) + sizeof(req->hdr)) {
 363                 hfi1_cdbg(
 364                    SDMA,
 365                    "[%u:%u:%u] First vector not big enough for header %lu/%lu",
 366                    dd->unit, uctxt->ctxt, fd->subctxt,
 367                    iovec[idx].iov_len, sizeof(info) + sizeof(req->hdr));
 368                 return -EINVAL;
 369         }
 370         ret = copy_from_user(&info, iovec[idx].iov_base, sizeof(info));
 371         if (ret) {
 372                 hfi1_cdbg(SDMA, "[%u:%u:%u] Failed to copy info QW (%d)",
 373                           dd->unit, uctxt->ctxt, fd->subctxt, ret);
 374                 return -EFAULT;
 375         }
 376
 377         trace_hfi1_sdma_user_reqinfo(dd, uctxt->ctxt, fd->subctxt,
 378                                      (u16 *)&info);
 379         if (info.comp_idx >= hfi1_sdma_comp_ring_size) {
 380                 hfi1_cdbg(SDMA,
 381                           "[%u:%u:%u:%u] Invalid comp index",
 382                           dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx);
 383                 return -EINVAL;
 384         }
 385
 386         /*
 387          * Sanity check the header io vector count.  Need at least 1 vector
 388          * (header) and cannot be larger than the actual io vector count.
 389          */
 390         if (req_iovcnt(info.ctrl) < 1 || req_iovcnt(info.ctrl) > dim) {
 391                 hfi1_cdbg(SDMA,
 392                           "[%u:%u:%u:%u] Invalid iov count %d, dim %ld",
 393                           dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx,
 394                           req_iovcnt(info.ctrl), dim);
 395                 return -EINVAL;
 396         }
 397
 398         if (!info.fragsize) {
 399                 hfi1_cdbg(SDMA,
 400                           "[%u:%u:%u:%u] Request does not specify fragsize",
 401                           dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx);
 402                 return -EINVAL;
 403         }
 404
 405         /* Try to claim the request. */
 406         if (test_and_set_bit(info.comp_idx, pq->req_in_use)) {
 407                 hfi1_cdbg(SDMA, "[%u:%u:%u] Entry %u is in use",
 408                           dd->unit, uctxt->ctxt, fd->subctxt,
 409                           info.comp_idx);
 410                 return -EBADSLT;
 411         }
 412         /*
 413          * All safety checks have been done and this request has been claimed.
 414          */
 415         trace_hfi1_sdma_user_process_request(dd, uctxt->ctxt, fd->subctxt,
 416                                              info.comp_idx);
 417         req = pq->reqs + info.comp_idx;
 418         req->data_iovs = req_iovcnt(info.ctrl) - 1; /* subtract header vector */
 419         req->data_len  = 0;
 420         req->pq = pq;
 421         req->cq = cq;
 422         req->ahg_idx = -1;
 423         req->iov_idx = 0;
 424         req->sent = 0;
 425         req->seqnum = 0;
 426         req->seqcomp = 0;
 427         req->seqsubmitted = 0;
 428         req->tids = NULL;
 429         req->has_error = 0;
 430         INIT_LIST_HEAD(&req->txps);
 431
 432         memcpy(&req->info, &info, sizeof(info));
 433
 434         /* The request is initialized, count it */
 435         atomic_inc(&pq->n_reqs);
 436
 437         if (req_opcode(info.ctrl) == EXPECTED) {
 438                 /* expected must have a TID info and at least one data vector */
 439                 if (req->data_iovs < 2) {
 440                         SDMA_DBG(req,
 441                                  "Not enough vectors for expected request");
 442                         ret = -EINVAL;
 443                         goto free_req;
 444                 }
 445                 req->data_iovs--;
 446         }
 447
 448         if (!info.npkts || req->data_iovs > MAX_VECTORS_PER_REQ) {
 449                 SDMA_DBG(req, "Too many vectors (%u/%u)", req->data_iovs,
 450                          MAX_VECTORS_PER_REQ);
 451                 ret = -EINVAL;
 452                 goto free_req;
 453         }
 454         /* Copy the header from the user buffer */
 455         ret = copy_from_user(&req->hdr, iovec[idx].iov_base + sizeof(info),
 456                              sizeof(req->hdr));
 457         if (ret) {
 458                 SDMA_DBG(req, "Failed to copy header template (%d)", ret);
 459                 ret = -EFAULT;
 460                 goto free_req;
 461         }
 462
 463         /* If Static rate control is not enabled, sanitize the header. */
 464         if (!HFI1_CAP_IS_USET(STATIC_RATE_CTRL))
 465                 req->hdr.pbc[2] = 0;
 466
 467         /* Validate the opcode. Do not trust packets from user space blindly. */
 468         opcode = (be32_to_cpu(req->hdr.bth[0]) >> 24) & 0xff;
 469         if ((opcode & USER_OPCODE_CHECK_MASK) !=
 470              USER_OPCODE_CHECK_VAL) {
 471                 SDMA_DBG(req, "Invalid opcode (%d)", opcode);
 472                 ret = -EINVAL;
 473                 goto free_req;
 474         }
 475         /*
 476          * Validate the vl. Do not trust packets from user space blindly.
 477          * VL comes from PBC, SC comes from LRH, and the VL needs to
 478          * match the SC look up.
 479          */
 480         vl = (le16_to_cpu(req->hdr.pbc[0]) >> 12) & 0xF;
 481         sc = (((be16_to_cpu(req->hdr.lrh[0]) >> 12) & 0xF) |
 482               (((le16_to_cpu(req->hdr.pbc[1]) >> 14) & 0x1) << 4));
 483         if (vl >= dd->pport->vls_operational ||
 484             vl != sc_to_vlt(dd, sc)) {
 485                 SDMA_DBG(req, "Invalid SC(%u)/VL(%u)", sc, vl);
 486                 ret = -EINVAL;
 487                 goto free_req;
 488         }
 489
 490         /* Checking P_KEY for requests from user-space */
 491         pkey = (u16)be32_to_cpu(req->hdr.bth[0]);
 492         slid = be16_to_cpu(req->hdr.lrh[3]);
 493         if (egress_pkey_check(dd->pport, slid, pkey, sc, PKEY_CHECK_INVALID)) {
 494                 ret = -EINVAL;
 495                 goto free_req;
 496         }
 497
 498         /*
 499          * Also should check the BTH.lnh. If it says the next header is GRH then
 500          * the RXE parsing will be off and will land in the middle of the KDETH
 501          * or miss it entirely.
 502          */
 503         if ((be16_to_cpu(req->hdr.lrh[0]) & 0x3) == HFI1_LRH_GRH) {
 504                 SDMA_DBG(req, "User tried to pass in a GRH");
 505                 ret = -EINVAL;
 506                 goto free_req;
 507         }
 508
 509         req->koffset = le32_to_cpu(req->hdr.kdeth.swdata[6]);
 510         /*
 511          * Calculate the initial TID offset based on the values of
 512          * KDETH.OFFSET and KDETH.OM that are passed in.
 513          */
 514         req->tidoffset = KDETH_GET(req->hdr.kdeth.ver_tid_offset, OFFSET) *
 515                 (KDETH_GET(req->hdr.kdeth.ver_tid_offset, OM) ?
 516                  KDETH_OM_LARGE : KDETH_OM_SMALL);
 517         trace_hfi1_sdma_user_initial_tidoffset(dd, uctxt->ctxt, fd->subctxt,
 518                                                info.comp_idx, req->tidoffset);
 519         idx++;
 520
 521         /* Save all the IO vector structures */
 522         for (i = 0; i < req->data_iovs; i++) {
 523                 req->iovs[i].offset = 0;
 524                 INIT_LIST_HEAD(&req->iovs[i].list);
 525                 memcpy(&req->iovs[i].iov,
 526                        iovec + idx++,
 527                        sizeof(req->iovs[i].iov));
 528                 ret = pin_vector_pages(req, &req->iovs[i]);
 529                 if (ret) {
 530                         req->data_iovs = i;
 531                         goto free_req;
 532                 }
 533                 req->data_len += req->iovs[i].iov.iov_len;
 534         }
 535         trace_hfi1_sdma_user_data_length(dd, uctxt->ctxt, fd->subctxt,
 536                                          info.comp_idx, req->data_len);
 537         if (pcount > req->info.npkts)
 538                 pcount = req->info.npkts;
 539         /*
 540          * Copy any TID info
 541          * User space will provide the TID info only when the
 542          * request type is EXPECTED. This is true even if there is
 543          * only one packet in the request and the header is already
 544          * setup. The reason for the singular TID case is that the
 545          * driver needs to perform safety checks.
 546          */
 547         if (req_opcode(req->info.ctrl) == EXPECTED) {
 548                 u16 ntids = iovec[idx].iov_len / sizeof(*req->tids);
 549                 u32 *tmp;
 550
 551                 if (!ntids || ntids > MAX_TID_PAIR_ENTRIES) {
 552                         ret = -EINVAL;
 553                         goto free_req;
 554                 }
 555
 556                 /*
 557                  * We have to copy all of the tids because they may vary
 558                  * in size and, therefore, the TID count might not be
 559                  * equal to the pkt count. However, there is no way to
 560                  * tell at this point.
 561                  */
 562                 tmp = memdup_user(iovec[idx].iov_base,
 563                                   ntids * sizeof(*req->tids));
 564                 if (IS_ERR(tmp)) {
 565                         ret = PTR_ERR(tmp);
 566                         SDMA_DBG(req, "Failed to copy %d TIDs (%d)",
 567                                  ntids, ret);
 568                         goto free_req;
 569                 }
 570                 req->tids = tmp;
 571                 req->n_tids = ntids;
 572                 req->tididx = 0;
 573                 idx++;
 574         }
 575
 576         dlid = be16_to_cpu(req->hdr.lrh[1]);
 577         selector = dlid_to_selector(dlid);
 578         selector += uctxt->ctxt + fd->subctxt;
 579         req->sde = sdma_select_user_engine(dd, selector, vl);
 580
 581         if (!req->sde || !sdma_running(req->sde)) {
 582                 ret = -ECOMM;
 583                 goto free_req;
 584         }
 585
 586         /* We don't need an AHG entry if the request contains only one packet */
 587         if (req->info.npkts > 1 && HFI1_CAP_IS_USET(SDMA_AHG))
 588                 req->ahg_idx = sdma_ahg_alloc(req->sde);
 589
 590         set_comp_state(pq, cq, info.comp_idx, QUEUED, 0);
 591         pq->state = SDMA_PKT_Q_ACTIVE;
 592
 593         /*
 594          * This is a somewhat blocking send implementation.
 595          * The driver will block the caller until all packets of the
 596          * request have been submitted to the SDMA engine. However, it
 597          * will not wait for send completions.
 598          */
 599         while (req->seqsubmitted != req->info.npkts) {
 600                 ret = user_sdma_send_pkts(req, pcount);
 601                 if (ret < 0) {
 602                         if (ret != -EBUSY)
 603                                 goto free_req;
 604                         if (wait_event_interruptible_timeout(
 605                                 pq->busy.wait_dma,
 606                                 pq->state == SDMA_PKT_Q_ACTIVE,
 607                                 msecs_to_jiffies(
 608                                         SDMA_IOWAIT_TIMEOUT)) <= 0)
 609                                 flush_pq_iowait(pq);
 610                 }
 611         }
 612         *count += idx;
 613         return 0;
 614 free_req:
 615         /*
 616          * If the submitted seqsubmitted == npkts, the completion routine
 617          * controls the final state.  If sequbmitted < npkts, wait for any
 618          * outstanding packets to finish before cleaning up.
 619          */
 620         if (req->seqsubmitted < req->info.npkts) {
 621                 if (req->seqsubmitted)
 622                         wait_event(pq->busy.wait_dma,
 623                                    (req->seqcomp == req->seqsubmitted - 1));
 624                 user_sdma_free_request(req, true);
 625                 pq_update(pq);
 626                 set_comp_state(pq, cq, info.comp_idx, ERROR, ret);
 627         }
 628         return ret;
 629 }
 630
 631 static inline u32 compute_data_length(struct user_sdma_request *req,
 632                                       struct user_sdma_txreq *tx)
 633 {
 634         /*
 635          * Determine the proper size of the packet data.
 636          * The size of the data of the first packet is in the header
 637          * template. However, it includes the header and ICRC, which need
 638          * to be subtracted.
 639          * The minimum representable packet data length in a header is 4 bytes,
 640          * therefore, when the data length request is less than 4 bytes, there's
 641          * only one packet, and the packet data length is equal to that of the
 642          * request data length.
 643          * The size of the remaining packets is the minimum of the frag
 644          * size (MTU) or remaining data in the request.
 645          */
 646         u32 len;
 647
 648         if (!req->seqnum) {
 649                 if (req->data_len < sizeof(u32))
 650                         len = req->data_len;
 651                 else
 652                         len = ((be16_to_cpu(req->hdr.lrh[2]) << 2) -
 653                                (sizeof(tx->hdr) - 4));
 654         } else if (req_opcode(req->info.ctrl) == EXPECTED) {
 655                 u32 tidlen = EXP_TID_GET(req->tids[req->tididx], LEN) *
 656                         PAGE_SIZE;
 657                 /*
 658                  * Get the data length based on the remaining space in the
 659                  * TID pair.
 660                  */
 661                 len = min(tidlen - req->tidoffset, (u32)req->info.fragsize);
 662                 /* If we've filled up the TID pair, move to the next one. */
 663                 if (unlikely(!len) && ++req->tididx < req->n_tids &&
 664                     req->tids[req->tididx]) {
 665                         tidlen = EXP_TID_GET(req->tids[req->tididx],
 666                                              LEN) * PAGE_SIZE;
 667                         req->tidoffset = 0;
 668                         len = min_t(u32, tidlen, req->info.fragsize);
 669                 }
 670                 /*
 671                  * Since the TID pairs map entire pages, make sure that we
 672                  * are not going to try to send more data that we have
 673                  * remaining.
 674                  */
 675                 len = min(len, req->data_len - req->sent);
 676         } else {
 677                 len = min(req->data_len - req->sent, (u32)req->info.fragsize);
 678         }
 679         trace_hfi1_sdma_user_compute_length(req->pq->dd,
 680                                             req->pq->ctxt,
 681                                             req->pq->subctxt,
 682                                             req->info.comp_idx,
 683                                             len);
 684         return len;
 685 }
 686
 687 static inline u32 pad_len(u32 len)
 688 {
 689         if (len & (sizeof(u32) - 1))
 690                 len += sizeof(u32) - (len & (sizeof(u32) - 1));
 691         return len;
 692 }
 693
 694 static inline u32 get_lrh_len(struct hfi1_pkt_header hdr, u32 len)
 695 {
 696         /* (Size of complete header - size of PBC) + 4B ICRC + data length */
 697         return ((sizeof(hdr) - sizeof(hdr.pbc)) + 4 + len);
 698 }
 699
 700 static int user_sdma_txadd_ahg(struct user_sdma_request *req,
 701                                struct user_sdma_txreq *tx,
 702                                u32 datalen)
 703 {
 704         int ret;
 705         u16 pbclen = le16_to_cpu(req->hdr.pbc[0]);
 706         u32 lrhlen = get_lrh_len(req->hdr, pad_len(datalen));
 707         struct hfi1_user_sdma_pkt_q *pq = req->pq;
 708
 709         /*
 710          * Copy the request header into the tx header
 711          * because the HW needs a cacheline-aligned
 712          * address.
 713          * This copy can be optimized out if the hdr
 714          * member of user_sdma_request were also
 715          * cacheline aligned.
 716          */
 717         memcpy(&tx->hdr, &req->hdr, sizeof(tx->hdr));
 718         if (PBC2LRH(pbclen) != lrhlen) {
 719                 pbclen = (pbclen & 0xf000) | LRH2PBC(lrhlen);
 720                 tx->hdr.pbc[0] = cpu_to_le16(pbclen);
 721         }
 722         ret = check_header_template(req, &tx->hdr, lrhlen, datalen);
 723         if (ret)
 724                 return ret;
 725         ret = sdma_txinit_ahg(&tx->txreq, SDMA_TXREQ_F_AHG_COPY,
 726                               sizeof(tx->hdr) + datalen, req->ahg_idx,
 727                               0, NULL, 0, user_sdma_txreq_cb);
 728         if (ret)
 729                 return ret;
 730         ret = sdma_txadd_kvaddr(pq->dd, &tx->txreq, &tx->hdr, sizeof(tx->hdr));
 731         if (ret)
 732                 sdma_txclean(pq->dd, &tx->txreq);
 733         return ret;
 734 }
 735
 736 static int user_sdma_txadd(struct user_sdma_request *req,
 737                            struct user_sdma_txreq *tx,
 738                            struct user_sdma_iovec *iovec, u32 datalen,
 739                            u32 *queued_ptr, u32 *data_sent_ptr,
 740                            u64 *iov_offset_ptr)
 741 {
 742         int ret;
 743         unsigned int pageidx, len;
 744         unsigned long base, offset;
 745         u64 iov_offset = *iov_offset_ptr;
 746         u32 queued = *queued_ptr, data_sent = *data_sent_ptr;
 747         struct hfi1_user_sdma_pkt_q *pq = req->pq;
 748
 749         base = (unsigned long)iovec->iov.iov_base;
 750         offset = offset_in_page(base + iovec->offset + iov_offset);
 751         pageidx = (((iovec->offset + iov_offset + base) - (base & PAGE_MASK)) >>
 752                    PAGE_SHIFT);
 753         len = offset + req->info.fragsize > PAGE_SIZE ?
 754                 PAGE_SIZE - offset : req->info.fragsize;
 755         len = min((datalen - queued), len);
 756         ret = sdma_txadd_page(pq->dd, &tx->txreq, iovec->pages[pageidx],
 757                               offset, len);
 758         if (ret) {
 759                 SDMA_DBG(req, "SDMA txreq add page failed %d\n", ret);
 760                 return ret;
 761         }
 762         iov_offset += len;
 763         queued += len;
 764         data_sent += len;
 765         if (unlikely(queued < datalen && pageidx == iovec->npages &&
 766                      req->iov_idx < req->data_iovs - 1)) {
 767                 iovec->offset += iov_offset;
 768                 iovec = &req->iovs[++req->iov_idx];
 769                 iov_offset = 0;
 770         }
 771
 772         *queued_ptr = queued;
 773         *data_sent_ptr = data_sent;
 774         *iov_offset_ptr = iov_offset;
 775         return ret;
 776 }
 777
 778 static int user_sdma_send_pkts(struct user_sdma_request *req, u16 maxpkts)
 779 {
 780         int ret = 0;
 781         u16 count;
 782         unsigned npkts = 0;
 783         struct user_sdma_txreq *tx = NULL;
 784         struct hfi1_user_sdma_pkt_q *pq = NULL;
 785         struct user_sdma_iovec *iovec = NULL;
 786
 787         if (!req->pq)
 788                 return -EINVAL;
 789
 790         pq = req->pq;
 791
 792         /* If tx completion has reported an error, we are done. */
 793         if (READ_ONCE(req->has_error))
 794                 return -EFAULT;
 795
 796         /*
 797          * Check if we might have sent the entire request already
 798          */
 799         if (unlikely(req->seqnum == req->info.npkts)) {
 800                 if (!list_empty(&req->txps))
 801                         goto dosend;
 802                 return ret;
 803         }
 804
 805         if (!maxpkts || maxpkts > req->info.npkts - req->seqnum)
 806                 maxpkts = req->info.npkts - req->seqnum;
 807
 808         while (npkts < maxpkts) {
 809                 u32 datalen = 0, queued = 0, data_sent = 0;
 810                 u64 iov_offset = 0;
 811
 812                 /*
 813                  * Check whether any of the completions have come back
 814                  * with errors. If so, we are not going to process any
 815                  * more packets from this request.
 816                  */
 817                 if (READ_ONCE(req->has_error))
 818                         return -EFAULT;
 819
 820                 tx = kmem_cache_alloc(pq->txreq_cache, GFP_KERNEL);
 821                 if (!tx)
 822                         return -ENOMEM;
 823
 824                 tx->flags = 0;
 825                 tx->req = req;
 826                 INIT_LIST_HEAD(&tx->list);
 827
 828                 /*
 829                  * For the last packet set the ACK request
 830                  * and disable header suppression.
 831                  */
 832                 if (req->seqnum == req->info.npkts - 1)
 833                         tx->flags |= (TXREQ_FLAGS_REQ_ACK |
 834                                       TXREQ_FLAGS_REQ_DISABLE_SH);
 835
 836                 /*
 837                  * Calculate the payload size - this is min of the fragment
 838                  * (MTU) size or the remaining bytes in the request but only
 839                  * if we have payload data.
 840                  */
 841                 if (req->data_len) {
 842                         iovec = &req->iovs[req->iov_idx];
 843                         if (READ_ONCE(iovec->offset) == iovec->iov.iov_len) {
 844                                 if (++req->iov_idx == req->data_iovs) {
 845                                         ret = -EFAULT;
 846                                         goto free_tx;
 847                                 }
 848                                 iovec = &req->iovs[req->iov_idx];
 849                                 WARN_ON(iovec->offset);
 850                         }
 851
 852                         datalen = compute_data_length(req, tx);
 853
 854                         /*
 855                          * Disable header suppression for the payload <= 8DWS.
 856                          * If there is an uncorrectable error in the receive
 857                          * data FIFO when the received payload size is less than
 858                          * or equal to 8DWS then the RxDmaDataFifoRdUncErr is
 859                          * not reported.There is set RHF.EccErr if the header
 860                          * is not suppressed.
 861                          */
 862                         if (!datalen) {
 863                                 SDMA_DBG(req,
 864                                          "Request has data but pkt len is 0");
 865                                 ret = -EFAULT;
 866                                 goto free_tx;
 867                         } else if (datalen <= 32) {
 868                                 tx->flags |= TXREQ_FLAGS_REQ_DISABLE_SH;
 869                         }
 870                 }
 871
 872                 if (req->ahg_idx >= 0) {
 873                         if (!req->seqnum) {
 874                                 ret = user_sdma_txadd_ahg(req, tx, datalen);
 875                                 if (ret)
 876                                         goto free_tx;
 877                         } else {
 878                                 int changes;
 879
 880                                 changes = set_txreq_header_ahg(req, tx,
 881                                                                datalen);
 882                                 if (changes < 0) {
 883                                         ret = changes;
 884                                         goto free_tx;
 885                                 }
 886                         }
 887                 } else {
 888                         ret = sdma_txinit(&tx->txreq, 0, sizeof(req->hdr) +
 889                                           datalen, user_sdma_txreq_cb);
 890                         if (ret)
 891                                 goto free_tx;
 892                         /*
 893                          * Modify the header for this packet. This only needs
 894                          * to be done if we are not going to use AHG. Otherwise,
 895                          * the HW will do it based on the changes we gave it
 896                          * during sdma_txinit_ahg().
 897                          */
 898                         ret = set_txreq_header(req, tx, datalen);
 899                         if (ret)
 900                                 goto free_txreq;
 901                 }
 902
 903                 /*
 904                  * If the request contains any data vectors, add up to
 905                  * fragsize bytes to the descriptor.
 906                  */
 907                 while (queued < datalen &&
 908                        (req->sent + data_sent) < req->data_len) {
 909                         ret = user_sdma_txadd(req, tx, iovec, datalen,
 910                                               &queued, &data_sent, &iov_offset);
 911                         if (ret)
 912                                 goto free_txreq;
 913                 }
 914                 /*
 915                  * The txreq was submitted successfully so we can update
 916                  * the counters.
 917                  */
 918                 req->koffset += datalen;
 919                 if (req_opcode(req->info.ctrl) == EXPECTED)
 920                         req->tidoffset += datalen;
 921                 req->sent += data_sent;
 922                 if (req->data_len)
 923                         iovec->offset += iov_offset;
 924                 list_add_tail(&tx->txreq.list, &req->txps);
 925                 /*
 926                  * It is important to increment this here as it is used to
 927                  * generate the BTH.PSN and, therefore, can't be bulk-updated
 928                  * outside of the loop.
 929                  */
 930                 tx->seqnum = req->seqnum++;
 931                 npkts++;
 932         }
 933 dosend:
 934         ret = sdma_send_txlist(req->sde,
 935                                iowait_get_ib_work(&pq->busy),
 936                                &req->txps, &count);
 937         req->seqsubmitted += count;
 938         if (req->seqsubmitted == req->info.npkts) {
 939                 /*
 940                  * The txreq has already been submitted to the HW queue
 941                  * so we can free the AHG entry now. Corruption will not
 942                  * happen due to the sequential manner in which
 943                  * descriptors are processed.
 944                  */
 945                 if (req->ahg_idx >= 0)
 946                         sdma_ahg_free(req->sde, req->ahg_idx);
 947         }
 948         return ret;
 949
 950 free_txreq:
 951         sdma_txclean(pq->dd, &tx->txreq);
 952 free_tx:
 953         kmem_cache_free(pq->txreq_cache, tx);
 954         return ret;
 955 }
 956
 957 static u32 sdma_cache_evict(struct hfi1_user_sdma_pkt_q *pq, u32 npages)
 958 {
 959         struct evict_data evict_data;
 960
 961         evict_data.cleared = 0;
 962         evict_data.target = npages;
 963         hfi1_mmu_rb_evict(pq->handler, &evict_data);
 964         return evict_data.cleared;
 965 }
 966
 967 static int pin_sdma_pages(struct user_sdma_request *req,
 968                           struct user_sdma_iovec *iovec,
 969                           struct sdma_mmu_node *node,
 970                           int npages)
 971 {
 972         int pinned, cleared;
 973         struct page **pages;
 974         struct hfi1_user_sdma_pkt_q *pq = req->pq;
 975
 976         pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
 977         if (!pages)
 978                 return -ENOMEM;
 979         memcpy(pages, node->pages, node->npages * sizeof(*pages));
 980
 981         npages -= node->npages;
 982 retry:
 983         if (!hfi1_can_pin_pages(pq->dd, current->mm,
 984                                 atomic_read(&pq->n_locked), npages)) {
 985                 cleared = sdma_cache_evict(pq, npages);
 986                 if (cleared >= npages)
 987                         goto retry;
 988         }
 989         pinned = hfi1_acquire_user_pages(current->mm,
 990                                          ((unsigned long)iovec->iov.iov_base +
 991                                          (node->npages * PAGE_SIZE)), npages, 0,
 992                                          pages + node->npages);
 993         if (pinned < 0) {
 994                 kfree(pages);
 995                 return pinned;
 996         }
 997         if (pinned != npages) {
 998                 unpin_vector_pages(current->mm, pages, node->npages, pinned);
 999                 return -EFAULT;
1000         }
1001         kfree(node->pages);
1002         node->rb.len = iovec->iov.iov_len;
1003         node->pages = pages;
1004         atomic_add(pinned, &pq->n_locked);
1005         return pinned;
1006 }
1007
1008 static void unpin_sdma_pages(struct sdma_mmu_node *node)
1009 {
1010         if (node->npages) {
1011                 unpin_vector_pages(mm_from_sdma_node(node), node->pages, 0,
1012                                    node->npages);
1013                 atomic_sub(node->npages, &node->pq->n_locked);
1014         }
1015 }
1016
1017 static int pin_vector_pages(struct user_sdma_request *req,
1018                             struct user_sdma_iovec *iovec)
1019 {
1020         int ret = 0, pinned, npages;
1021         struct hfi1_user_sdma_pkt_q *pq = req->pq;
1022         struct sdma_mmu_node *node = NULL;
1023         struct mmu_rb_node *rb_node;
1024         struct iovec *iov;
1025         bool extracted;
1026
1027         extracted =
1028                 hfi1_mmu_rb_remove_unless_exact(pq->handler,
1029                                                 (unsigned long)
1030                                                 iovec->iov.iov_base,
1031                                                 iovec->iov.iov_len, &rb_node);
1032         if (rb_node) {
1033                 node = container_of(rb_node, struct sdma_mmu_node, rb);
1034                 if (!extracted) {
1035                         atomic_inc(&node->refcount);
1036                         iovec->pages = node->pages;
1037                         iovec->npages = node->npages;
1038                         iovec->node = node;
1039                         return 0;
1040                 }
1041         }
1042
1043         if (!node) {
1044                 node = kzalloc(sizeof(*node), GFP_KERNEL);
1045                 if (!node)
1046                         return -ENOMEM;
1047
1048                 node->rb.addr = (unsigned long)iovec->iov.iov_base;
1049                 node->pq = pq;
1050                 atomic_set(&node->refcount, 0);
1051         }
1052
1053         iov = &iovec->iov;
1054         npages = num_user_pages((unsigned long)iov->iov_base, iov->iov_len);
1055         if (node->npages < npages) {
1056                 pinned = pin_sdma_pages(req, iovec, node, npages);
1057                 if (pinned < 0) {
1058                         ret = pinned;
1059                         goto bail;
1060                 }
1061                 node->npages += pinned;
1062                 npages = node->npages;
1063         }
1064         iovec->pages = node->pages;
1065         iovec->npages = npages;
1066         iovec->node = node;
1067
1068         ret = hfi1_mmu_rb_insert(req->pq->handler, &node->rb);
1069         if (ret) {
1070                 iovec->node = NULL;
1071                 goto bail;
1072         }
1073         return 0;
1074 bail:
1075         unpin_sdma_pages(node);
1076         kfree(node);
1077         return ret;
1078 }
1079
1080 static void unpin_vector_pages(struct mm_struct *mm, struct page **pages,
1081                                unsigned start, unsigned npages)
1082 {
1083         hfi1_release_user_pages(mm, pages + start, npages, false);
1084         kfree(pages);
1085 }
1086
1087 static int check_header_template(struct user_sdma_request *req,
1088                                  struct hfi1_pkt_header *hdr, u32 lrhlen,
1089                                  u32 datalen)
1090 {
1091         /*
1092          * Perform safety checks for any type of packet:
1093          *    - transfer size is multiple of 64bytes
1094          *    - packet length is multiple of 4 bytes
1095          *    - packet length is not larger than MTU size
1096          *
1097          * These checks are only done for the first packet of the
1098          * transfer since the header is "given" to us by user space.
1099          * For the remainder of the packets we compute the values.
1100          */
1101         if (req->info.fragsize % PIO_BLOCK_SIZE || lrhlen & 0x3 ||
1102             lrhlen > get_lrh_len(*hdr, req->info.fragsize))
1103                 return -EINVAL;
1104
1105         if (req_opcode(req->info.ctrl) == EXPECTED) {
1106                 /*
1107                  * The header is checked only on the first packet. Furthermore,
1108                  * we ensure that at least one TID entry is copied when the
1109                  * request is submitted. Therefore, we don't have to verify that
1110                  * tididx points to something sane.
1111                  */
1112                 u32 tidval = req->tids[req->tididx],
1113                         tidlen = EXP_TID_GET(tidval, LEN) * PAGE_SIZE,
1114                         tididx = EXP_TID_GET(tidval, IDX),
1115                         tidctrl = EXP_TID_GET(tidval, CTRL),
1116                         tidoff;
1117                 __le32 kval = hdr->kdeth.ver_tid_offset;
1118
1119                 tidoff = KDETH_GET(kval, OFFSET) *
1120                           (KDETH_GET(req->hdr.kdeth.ver_tid_offset, OM) ?
1121                            KDETH_OM_LARGE : KDETH_OM_SMALL);
1122                 /*
1123                  * Expected receive packets have the following
1124                  * additional checks:
1125                  *     - offset is not larger than the TID size
1126                  *     - TIDCtrl values match between header and TID array
1127                  *     - TID indexes match between header and TID array
1128                  */
1129                 if ((tidoff + datalen > tidlen) ||
1130                     KDETH_GET(kval, TIDCTRL) != tidctrl ||
1131                     KDETH_GET(kval, TID) != tididx)
1132                         return -EINVAL;
1133         }
1134         return 0;
1135 }
1136
1137 /*
1138  * Correctly set the BTH.PSN field based on type of
1139  * transfer - eager packets can just increment the PSN but
1140  * expected packets encode generation and sequence in the
1141  * BTH.PSN field so just incrementing will result in errors.
1142  */
1143 static inline u32 set_pkt_bth_psn(__be32 bthpsn, u8 expct, u32 frags)
1144 {
1145         u32 val = be32_to_cpu(bthpsn),
1146                 mask = (HFI1_CAP_IS_KSET(EXTENDED_PSN) ? 0x7fffffffull :
1147                         0xffffffull),
1148                 psn = val & mask;
1149         if (expct)
1150                 psn = (psn & ~HFI1_KDETH_BTH_SEQ_MASK) |
1151                         ((psn + frags) & HFI1_KDETH_BTH_SEQ_MASK);
1152         else
1153                 psn = psn + frags;
1154         return psn & mask;
1155 }
1156
1157 static int set_txreq_header(struct user_sdma_request *req,
1158                             struct user_sdma_txreq *tx, u32 datalen)
1159 {
1160         struct hfi1_user_sdma_pkt_q *pq = req->pq;
1161         struct hfi1_pkt_header *hdr = &tx->hdr;
1162         u8 omfactor; /* KDETH.OM */
1163         u16 pbclen;
1164         int ret;
1165         u32 tidval = 0, lrhlen = get_lrh_len(*hdr, pad_len(datalen));
1166
1167         /* Copy the header template to the request before modification */
1168         memcpy(hdr, &req->hdr, sizeof(*hdr));
1169
1170         /*
1171          * Check if the PBC and LRH length are mismatched. If so
1172          * adjust both in the header.
1173          */
1174         pbclen = le16_to_cpu(hdr->pbc[0]);
1175         if (PBC2LRH(pbclen) != lrhlen) {
1176                 pbclen = (pbclen & 0xf000) | LRH2PBC(lrhlen);
1177                 hdr->pbc[0] = cpu_to_le16(pbclen);
1178                 hdr->lrh[2] = cpu_to_be16(lrhlen >> 2);
1179                 /*
1180                  * Third packet
1181                  * This is the first packet in the sequence that has
1182                  * a "static" size that can be used for the rest of
1183                  * the packets (besides the last one).
1184                  */
1185                 if (unlikely(req->seqnum == 2)) {
1186                         /*
1187                          * From this point on the lengths in both the
1188                          * PBC and LRH are the same until the last
1189                          * packet.
1190                          * Adjust the template so we don't have to update
1191                          * every packet
1192                          */
1193                         req->hdr.pbc[0] = hdr->pbc[0];
1194                         req->hdr.lrh[2] = hdr->lrh[2];
1195                 }
1196         }
1197         /*
1198          * We only have to modify the header if this is not the
1199          * first packet in the request. Otherwise, we use the
1200          * header given to us.
1201          */
1202         if (unlikely(!req->seqnum)) {
1203                 ret = check_header_template(req, hdr, lrhlen, datalen);
1204                 if (ret)
1205                         return ret;
1206                 goto done;
1207         }
1208
1209         hdr->bth[2] = cpu_to_be32(
1210                 set_pkt_bth_psn(hdr->bth[2],
1211                                 (req_opcode(req->info.ctrl) == EXPECTED),
1212                                 req->seqnum));
1213
1214         /* Set ACK request on last packet */
1215         if (unlikely(tx->flags & TXREQ_FLAGS_REQ_ACK))
1216                 hdr->bth[2] |= cpu_to_be32(1UL << 31);
1217
1218         /* Set the new offset */
1219         hdr->kdeth.swdata[6] = cpu_to_le32(req->koffset);
1220         /* Expected packets have to fill in the new TID information */
1221         if (req_opcode(req->info.ctrl) == EXPECTED) {
1222                 tidval = req->tids[req->tididx];
1223                 /*
1224                  * If the offset puts us at the end of the current TID,
1225                  * advance everything.
1226                  */
1227                 if ((req->tidoffset) == (EXP_TID_GET(tidval, LEN) *
1228                                          PAGE_SIZE)) {
1229                         req->tidoffset = 0;
1230                         /*
1231                          * Since we don't copy all the TIDs, all at once,
1232                          * we have to check again.
1233                          */
1234                         if (++req->tididx > req->n_tids - 1 ||
1235                             !req->tids[req->tididx]) {
1236                                 return -EINVAL;
1237                         }
1238                         tidval = req->tids[req->tididx];
1239                 }
1240                 omfactor = EXP_TID_GET(tidval, LEN) * PAGE_SIZE >=
1241                         KDETH_OM_MAX_SIZE ? KDETH_OM_LARGE_SHIFT :
1242                         KDETH_OM_SMALL_SHIFT;
1243                 /* Set KDETH.TIDCtrl based on value for this TID. */
1244                 KDETH_SET(hdr->kdeth.ver_tid_offset, TIDCTRL,
1245                           EXP_TID_GET(tidval, CTRL));
1246                 /* Set KDETH.TID based on value for this TID */
1247                 KDETH_SET(hdr->kdeth.ver_tid_offset, TID,
1248                           EXP_TID_GET(tidval, IDX));
1249                 /* Clear KDETH.SH when DISABLE_SH flag is set */
1250                 if (unlikely(tx->flags & TXREQ_FLAGS_REQ_DISABLE_SH))
1251                         KDETH_SET(hdr->kdeth.ver_tid_offset, SH, 0);
1252                 /*
1253                  * Set the KDETH.OFFSET and KDETH.OM based on size of
1254                  * transfer.
1255                  */
1256                 trace_hfi1_sdma_user_tid_info(
1257                         pq->dd, pq->ctxt, pq->subctxt, req->info.comp_idx,
1258                         req->tidoffset, req->tidoffset >> omfactor,
1259                         omfactor != KDETH_OM_SMALL_SHIFT);
1260                 KDETH_SET(hdr->kdeth.ver_tid_offset, OFFSET,
1261                           req->tidoffset >> omfactor);
1262                 KDETH_SET(hdr->kdeth.ver_tid_offset, OM,
1263                           omfactor != KDETH_OM_SMALL_SHIFT);
1264         }
1265 done:
1266         trace_hfi1_sdma_user_header(pq->dd, pq->ctxt, pq->subctxt,
1267                                     req->info.comp_idx, hdr, tidval);
1268         return sdma_txadd_kvaddr(pq->dd, &tx->txreq, hdr, sizeof(*hdr));
1269 }
1270
1271 static int set_txreq_header_ahg(struct user_sdma_request *req,
1272                                 struct user_sdma_txreq *tx, u32 datalen)
1273 {
1274         u32 ahg[AHG_KDETH_ARRAY_SIZE];
1275         int idx = 0;
1276         u8 omfactor; /* KDETH.OM */
1277         struct hfi1_user_sdma_pkt_q *pq = req->pq;
1278         struct hfi1_pkt_header *hdr = &req->hdr;
1279         u16 pbclen = le16_to_cpu(hdr->pbc[0]);
1280         u32 val32, tidval = 0, lrhlen = get_lrh_len(*hdr, pad_len(datalen));
1281         size_t array_size = ARRAY_SIZE(ahg);
1282
1283         if (PBC2LRH(pbclen) != lrhlen) {
1284                 /* PBC.PbcLengthDWs */
1285                 idx = ahg_header_set(ahg, idx, array_size, 0, 0, 12,
1286                                      (__force u16)cpu_to_le16(LRH2PBC(lrhlen)));
1287                 if (idx < 0)
1288                         return idx;
1289                 /* LRH.PktLen (we need the full 16 bits due to byte swap) */
1290                 idx = ahg_header_set(ahg, idx, array_size, 3, 0, 16,
1291                                      (__force u16)cpu_to_be16(lrhlen >> 2));
1292                 if (idx < 0)
1293                         return idx;
1294         }
1295
1296         /*
1297          * Do the common updates
1298          */
1299         /* BTH.PSN and BTH.A */
1300         val32 = (be32_to_cpu(hdr->bth[2]) + req->seqnum) &
1301                 (HFI1_CAP_IS_KSET(EXTENDED_PSN) ? 0x7fffffff : 0xffffff);
1302         if (unlikely(tx->flags & TXREQ_FLAGS_REQ_ACK))
1303                 val32 |= 1UL << 31;
1304         idx = ahg_header_set(ahg, idx, array_size, 6, 0, 16,
1305                              (__force u16)cpu_to_be16(val32 >> 16));
1306         if (idx < 0)
1307                 return idx;
1308         idx = ahg_header_set(ahg, idx, array_size, 6, 16, 16,
1309                              (__force u16)cpu_to_be16(val32 & 0xffff));
1310         if (idx < 0)
1311                 return idx;
1312         /* KDETH.Offset */
1313         idx = ahg_header_set(ahg, idx, array_size, 15, 0, 16,
1314                              (__force u16)cpu_to_le16(req->koffset & 0xffff));
1315         if (idx < 0)
1316                 return idx;
1317         idx = ahg_header_set(ahg, idx, array_size, 15, 16, 16,
1318                              (__force u16)cpu_to_le16(req->koffset >> 16));
1319         if (idx < 0)
1320                 return idx;
1321         if (req_opcode(req->info.ctrl) == EXPECTED) {
1322                 __le16 val;
1323
1324                 tidval = req->tids[req->tididx];
1325
1326                 /*
1327                  * If the offset puts us at the end of the current TID,
1328                  * advance everything.
1329                  */
1330                 if ((req->tidoffset) == (EXP_TID_GET(tidval, LEN) *
1331                                          PAGE_SIZE)) {
1332                         req->tidoffset = 0;
1333                         /*
1334                          * Since we don't copy all the TIDs, all at once,
1335                          * we have to check again.
1336                          */
1337                         if (++req->tididx > req->n_tids - 1 ||
1338                             !req->tids[req->tididx])
1339                                 return -EINVAL;
1340                         tidval = req->tids[req->tididx];
1341                 }
1342                 omfactor = ((EXP_TID_GET(tidval, LEN) *
1343                                   PAGE_SIZE) >=
1344                                  KDETH_OM_MAX_SIZE) ? KDETH_OM_LARGE_SHIFT :
1345                                  KDETH_OM_SMALL_SHIFT;
1346                 /* KDETH.OM and KDETH.OFFSET (TID) */
1347                 idx = ahg_header_set(
1348                                 ahg, idx, array_size, 7, 0, 16,
1349                                 ((!!(omfactor - KDETH_OM_SMALL_SHIFT)) << 15 |
1350                                 ((req->tidoffset >> omfactor)
1351                                 & 0x7fff)));
1352                 if (idx < 0)
1353                         return idx;
1354                 /* KDETH.TIDCtrl, KDETH.TID, KDETH.Intr, KDETH.SH */
1355                 val = cpu_to_le16(((EXP_TID_GET(tidval, CTRL) & 0x3) << 10) |
1356                                    (EXP_TID_GET(tidval, IDX) & 0x3ff));
1357
1358                 if (unlikely(tx->flags & TXREQ_FLAGS_REQ_DISABLE_SH)) {
1359                         val |= cpu_to_le16((KDETH_GET(hdr->kdeth.ver_tid_offset,
1360                                                       INTR) <<
1361                                             AHG_KDETH_INTR_SHIFT));
1362                 } else {
1363                         val |= KDETH_GET(hdr->kdeth.ver_tid_offset, SH) ?
1364                                cpu_to_le16(0x1 << AHG_KDETH_SH_SHIFT) :
1365                                cpu_to_le16((KDETH_GET(hdr->kdeth.ver_tid_offset,
1366                                                       INTR) <<
1367                                              AHG_KDETH_INTR_SHIFT));
1368                 }
1369
1370                 idx = ahg_header_set(ahg, idx, array_size,
1371                                      7, 16, 14, (__force u16)val);
1372                 if (idx < 0)
1373                         return idx;
1374         }
1375
1376         trace_hfi1_sdma_user_header_ahg(pq->dd, pq->ctxt, pq->subctxt,
1377                                         req->info.comp_idx, req->sde->this_idx,
1378                                         req->ahg_idx, ahg, idx, tidval);
1379         sdma_txinit_ahg(&tx->txreq,
1380                         SDMA_TXREQ_F_USE_AHG,
1381                         datalen, req->ahg_idx, idx,
1382                         ahg, sizeof(req->hdr),
1383                         user_sdma_txreq_cb);
1384
1385         return idx;
1386 }
1387
1388 /**
1389  * user_sdma_txreq_cb() - SDMA tx request completion callback.
1390  * @txreq: valid sdma tx request
1391  * @status: success/failure of request
1392  *
1393  * Called when the SDMA progress state machine gets notification that
1394  * the SDMA descriptors for this tx request have been processed by the
1395  * DMA engine. Called in interrupt context.
1396  * Only do work on completed sequences.
1397  */
1398 static void user_sdma_txreq_cb(struct sdma_txreq *txreq, int status)
1399 {
1400         struct user_sdma_txreq *tx =
1401                 container_of(txreq, struct user_sdma_txreq, txreq);
1402         struct user_sdma_request *req;
1403         struct hfi1_user_sdma_pkt_q *pq;
1404         struct hfi1_user_sdma_comp_q *cq;
1405         enum hfi1_sdma_comp_state state = COMPLETE;
1406
1407         if (!tx->req)
1408                 return;
1409
1410         req = tx->req;
1411         pq = req->pq;
1412         cq = req->cq;
1413
1414         if (status != SDMA_TXREQ_S_OK) {
1415                 SDMA_DBG(req, "SDMA completion with error %d",
1416                          status);
1417                 WRITE_ONCE(req->has_error, 1);
1418                 state = ERROR;
1419         }
1420
1421         req->seqcomp = tx->seqnum;
1422         kmem_cache_free(pq->txreq_cache, tx);
1423
1424         /* sequence isn't complete?  We are done */
1425         if (req->seqcomp != req->info.npkts - 1)
1426                 return;
1427
1428         user_sdma_free_request(req, false);
1429         set_comp_state(pq, cq, req->info.comp_idx, state, status);
1430         pq_update(pq);
1431 }
1432
1433 static inline void pq_update(struct hfi1_user_sdma_pkt_q *pq)
1434 {
1435         if (atomic_dec_and_test(&pq->n_reqs))
1436                 wake_up(&pq->wait);
1437 }
1438
1439 static void user_sdma_free_request(struct user_sdma_request *req, bool unpin)
1440 {
1441         int i;
1442
1443         if (!list_empty(&req->txps)) {
1444                 struct sdma_txreq *t, *p;
1445
1446                 list_for_each_entry_safe(t, p, &req->txps, list) {
1447                         struct user_sdma_txreq *tx =
1448                                 container_of(t, struct user_sdma_txreq, txreq);
1449                         list_del_init(&t->list);
1450                         sdma_txclean(req->pq->dd, t);
1451                         kmem_cache_free(req->pq->txreq_cache, tx);
1452                 }
1453         }
1454
1455         for (i = 0; i < req->data_iovs; i++) {
1456                 struct sdma_mmu_node *node = req->iovs[i].node;
1457
1458                 if (!node)
1459                         continue;
1460
1461                 req->iovs[i].node = NULL;
1462
1463                 if (unpin)
1464                         hfi1_mmu_rb_remove(req->pq->handler,
1465                                            &node->rb);
1466                 else
1467                         atomic_dec(&node->refcount);
1468         }
1469
1470         kfree(req->tids);
1471         clear_bit(req->info.comp_idx, req->pq->req_in_use);
1472 }
1473
1474 static inline void set_comp_state(struct hfi1_user_sdma_pkt_q *pq,
1475                                   struct hfi1_user_sdma_comp_q *cq,
1476                                   u16 idx, enum hfi1_sdma_comp_state state,
1477                                   int ret)
1478 {
1479         if (state == ERROR)
1480                 cq->comps[idx].errcode = -ret;
1481         smp_wmb(); /* make sure errcode is visible first */
1482         cq->comps[idx].status = state;
1483         trace_hfi1_sdma_user_completion(pq->dd, pq->ctxt, pq->subctxt,
1484                                         idx, state, ret);
1485 }
1486
1487 static bool sdma_rb_filter(struct mmu_rb_node *node, unsigned long addr,
1488                            unsigned long len)
1489 {
1490         return (bool)(node->addr == addr);
1491 }
1492
1493 static int sdma_rb_insert(void *arg, struct mmu_rb_node *mnode)
1494 {
1495         struct sdma_mmu_node *node =
1496                 container_of(mnode, struct sdma_mmu_node, rb);
1497
1498         atomic_inc(&node->refcount);
1499         return 0;
1500 }
1501
1502 /*
1503  * Return 1 to remove the node from the rb tree and call the remove op.
1504  *
1505  * Called with the rb tree lock held.
1506  */
1507 static int sdma_rb_evict(void *arg, struct mmu_rb_node *mnode,
1508                          void *evict_arg, bool *stop)
1509 {
1510         struct sdma_mmu_node *node =
1511                 container_of(mnode, struct sdma_mmu_node, rb);
1512         struct evict_data *evict_data = evict_arg;
1513
1514         /* is this node still being used? */
1515         if (atomic_read(&node->refcount))
1516                 return 0; /* keep this node */
1517
1518         /* this node will be evicted, add its pages to our count */
1519         evict_data->cleared += node->npages;
1520
1521         /* have enough pages been cleared? */
1522         if (evict_data->cleared >= evict_data->target)
1523                 *stop = true;
1524
1525         return 1; /* remove this node */
1526 }
1527
1528 static void sdma_rb_remove(void *arg, struct mmu_rb_node *mnode)
1529 {
1530         struct sdma_mmu_node *node =
1531                 container_of(mnode, struct sdma_mmu_node, rb);
1532
1533         unpin_sdma_pages(node);
1534         kfree(node);
1535 }
1536
1537 static int sdma_rb_invalidate(void *arg, struct mmu_rb_node *mnode)
1538 {
1539         struct sdma_mmu_node *node =
1540                 container_of(mnode, struct sdma_mmu_node, rb);
1541
1542         if (!atomic_read(&node->refcount))
1543                 return 1;
1544         return 0;
1545 }