drivers/infiniband/hw/hfi1/file_ops.c

   1 /*
   2  * Copyright(c) 2015, 2016 Intel Corporation.
   3  *
   4  * This file is provided under a dual BSD/GPLv2 license.  When using or
   5  * redistributing this file, you may do so under either license.
   6  *
   7  * GPL LICENSE SUMMARY
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * BSD LICENSE
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  *
  24  *  - Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  *  - Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in
  28  *    the documentation and/or other materials provided with the
  29  *    distribution.
  30  *  - Neither the name of Intel Corporation nor the names of its
  31  *    contributors may be used to endorse or promote products derived
  32  *    from this software without specific prior written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45  *
  46  */
  47 #include <linux/poll.h>
  48 #include <linux/cdev.h>
  49 #include <linux/vmalloc.h>
  50 #include <linux/io.h>
  51
  52 #include <rdma/ib.h>
  53
  54 #include "hfi.h"
  55 #include "pio.h"
  56 #include "device.h"
  57 #include "common.h"
  58 #include "trace.h"
  59 #include "user_sdma.h"
  60 #include "user_exp_rcv.h"
  61 #include "aspm.h"
  62 #include "mmu_rb.h"
  63
  64 #undef pr_fmt
  65 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
  66
  67 #define SEND_CTXT_HALT_TIMEOUT 1000 /* msecs */
  68
  69 /*
  70  * File operation functions
  71  */
  72 static int hfi1_file_open(struct inode *, struct file *);
  73 static int hfi1_file_close(struct inode *, struct file *);
  74 static ssize_t hfi1_write_iter(struct kiocb *, struct iov_iter *);
  75 static unsigned int hfi1_poll(struct file *, struct poll_table_struct *);
  76 static int hfi1_file_mmap(struct file *, struct vm_area_struct *);
  77
  78 static u64 kvirt_to_phys(void *);
  79 static int assign_ctxt(struct file *, struct hfi1_user_info *);
  80 static int init_subctxts(struct hfi1_ctxtdata *, const struct hfi1_user_info *);
  81 static int user_init(struct file *);
  82 static int get_ctxt_info(struct file *, void __user *, __u32);
  83 static int get_base_info(struct file *, void __user *, __u32);
  84 static int setup_ctxt(struct file *);
  85 static int setup_subctxt(struct hfi1_ctxtdata *);
  86 static int get_user_context(struct file *, struct hfi1_user_info *, int);
  87 static int find_shared_ctxt(struct file *, const struct hfi1_user_info *);
  88 static int allocate_ctxt(struct file *, struct hfi1_devdata *,
  89                          struct hfi1_user_info *);
  90 static unsigned int poll_urgent(struct file *, struct poll_table_struct *);
  91 static unsigned int poll_next(struct file *, struct poll_table_struct *);
  92 static int user_event_ack(struct hfi1_ctxtdata *, int, unsigned long);
  93 static int set_ctxt_pkey(struct hfi1_ctxtdata *, unsigned, u16);
  94 static int manage_rcvq(struct hfi1_ctxtdata *, unsigned, int);
  95 static int vma_fault(struct vm_area_struct *, struct vm_fault *);
  96 static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
  97                             unsigned long arg);
  98
  99 static const struct file_operations hfi1_file_ops = {
 100         .owner = THIS_MODULE,
 101         .write_iter = hfi1_write_iter,
 102         .open = hfi1_file_open,
 103         .release = hfi1_file_close,
 104         .unlocked_ioctl = hfi1_file_ioctl,
 105         .poll = hfi1_poll,
 106         .mmap = hfi1_file_mmap,
 107         .llseek = noop_llseek,
 108 };
 109
 110 static struct vm_operations_struct vm_ops = {
 111         .fault = vma_fault,
 112 };
 113
 114 /*
 115  * Types of memories mapped into user processes' space
 116  */
 117 enum mmap_types {
 118         PIO_BUFS = 1,
 119         PIO_BUFS_SOP,
 120         PIO_CRED,
 121         RCV_HDRQ,
 122         RCV_EGRBUF,
 123         UREGS,
 124         EVENTS,
 125         STATUS,
 126         RTAIL,
 127         SUBCTXT_UREGS,
 128         SUBCTXT_RCV_HDRQ,
 129         SUBCTXT_EGRBUF,
 130         SDMA_COMP
 131 };
 132
 133 /*
 134  * Masks and offsets defining the mmap tokens
 135  */
 136 #define HFI1_MMAP_OFFSET_MASK   0xfffULL
 137 #define HFI1_MMAP_OFFSET_SHIFT  0
 138 #define HFI1_MMAP_SUBCTXT_MASK  0xfULL
 139 #define HFI1_MMAP_SUBCTXT_SHIFT 12
 140 #define HFI1_MMAP_CTXT_MASK     0xffULL
 141 #define HFI1_MMAP_CTXT_SHIFT    16
 142 #define HFI1_MMAP_TYPE_MASK     0xfULL
 143 #define HFI1_MMAP_TYPE_SHIFT    24
 144 #define HFI1_MMAP_MAGIC_MASK    0xffffffffULL
 145 #define HFI1_MMAP_MAGIC_SHIFT   32
 146
 147 #define HFI1_MMAP_MAGIC         0xdabbad00
 148
 149 #define HFI1_MMAP_TOKEN_SET(field, val) \
 150         (((val) & HFI1_MMAP_##field##_MASK) << HFI1_MMAP_##field##_SHIFT)
 151 #define HFI1_MMAP_TOKEN_GET(field, token) \
 152         (((token) >> HFI1_MMAP_##field##_SHIFT) & HFI1_MMAP_##field##_MASK)
 153 #define HFI1_MMAP_TOKEN(type, ctxt, subctxt, addr)   \
 154         (HFI1_MMAP_TOKEN_SET(MAGIC, HFI1_MMAP_MAGIC) | \
 155         HFI1_MMAP_TOKEN_SET(TYPE, type) | \
 156         HFI1_MMAP_TOKEN_SET(CTXT, ctxt) | \
 157         HFI1_MMAP_TOKEN_SET(SUBCTXT, subctxt) | \
 158         HFI1_MMAP_TOKEN_SET(OFFSET, (offset_in_page(addr))))
 159
 160 #define dbg(fmt, ...)                           \
 161         pr_info(fmt, ##__VA_ARGS__)
 162
 163 static inline int is_valid_mmap(u64 token)
 164 {
 165         return (HFI1_MMAP_TOKEN_GET(MAGIC, token) == HFI1_MMAP_MAGIC);
 166 }
 167
 168 static int hfi1_file_open(struct inode *inode, struct file *fp)
 169 {
 170         struct hfi1_filedata *fd;
 171         struct hfi1_devdata *dd = container_of(inode->i_cdev,
 172                                                struct hfi1_devdata,
 173                                                user_cdev);
 174
 175         if (!atomic_inc_not_zero(&dd->user_refcount))
 176                 return -ENXIO;
 177
 178         /* Just take a ref now. Not all opens result in a context assign */
 179         kobject_get(&dd->kobj);
 180
 181         /* The real work is performed later in assign_ctxt() */
 182
 183         fd = kzalloc(sizeof(*fd), GFP_KERNEL);
 184
 185         if (fd) {
 186                 fd->rec_cpu_num = -1; /* no cpu affinity by default */
 187                 fd->mm = current->mm;
 188                 atomic_inc(&fd->mm->mm_count);
 189                 fp->private_data = fd;
 190         } else {
 191                 fp->private_data = NULL;
 192
 193                 if (atomic_dec_and_test(&dd->user_refcount))
 194                         complete(&dd->user_comp);
 195
 196                 return -ENOMEM;
 197         }
 198
 199         return 0;
 200 }
 201
 202 static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
 203                             unsigned long arg)
 204 {
 205         struct hfi1_filedata *fd = fp->private_data;
 206         struct hfi1_ctxtdata *uctxt = fd->uctxt;
 207         struct hfi1_user_info uinfo;
 208         struct hfi1_tid_info tinfo;
 209         int ret = 0;
 210         unsigned long addr;
 211         int uval = 0;
 212         unsigned long ul_uval = 0;
 213         u16 uval16 = 0;
 214
 215         hfi1_cdbg(IOCTL, "IOCTL recv: 0x%x", cmd);
 216         if (cmd != HFI1_IOCTL_ASSIGN_CTXT &&
 217             cmd != HFI1_IOCTL_GET_VERS &&
 218             !uctxt)
 219                 return -EINVAL;
 220
 221         switch (cmd) {
 222         case HFI1_IOCTL_ASSIGN_CTXT:
 223                 if (uctxt)
 224                         return -EINVAL;
 225
 226                 if (copy_from_user(&uinfo,
 227                                    (struct hfi1_user_info __user *)arg,
 228                                    sizeof(uinfo)))
 229                         return -EFAULT;
 230
 231                 ret = assign_ctxt(fp, &uinfo);
 232                 if (ret < 0)
 233                         return ret;
 234                 ret = setup_ctxt(fp);
 235                 if (ret)
 236                         return ret;
 237                 ret = user_init(fp);
 238                 break;
 239         case HFI1_IOCTL_CTXT_INFO:
 240                 ret = get_ctxt_info(fp, (void __user *)(unsigned long)arg,
 241                                     sizeof(struct hfi1_ctxt_info));
 242                 break;
 243         case HFI1_IOCTL_USER_INFO:
 244                 ret = get_base_info(fp, (void __user *)(unsigned long)arg,
 245                                     sizeof(struct hfi1_base_info));
 246                 break;
 247         case HFI1_IOCTL_CREDIT_UPD:
 248                 if (uctxt)
 249                         sc_return_credits(uctxt->sc);
 250                 break;
 251
 252         case HFI1_IOCTL_TID_UPDATE:
 253                 if (copy_from_user(&tinfo,
 254                                    (struct hfi11_tid_info __user *)arg,
 255                                    sizeof(tinfo)))
 256                         return -EFAULT;
 257
 258                 ret = hfi1_user_exp_rcv_setup(fp, &tinfo);
 259                 if (!ret) {
 260                         /*
 261                          * Copy the number of tidlist entries we used
 262                          * and the length of the buffer we registered.
 263                          * These fields are adjacent in the structure so
 264                          * we can copy them at the same time.
 265                          */
 266                         addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
 267                         if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
 268                                          sizeof(tinfo.tidcnt) +
 269                                          sizeof(tinfo.length)))
 270                                 ret = -EFAULT;
 271                 }
 272                 break;
 273
 274         case HFI1_IOCTL_TID_FREE:
 275                 if (copy_from_user(&tinfo,
 276                                    (struct hfi11_tid_info __user *)arg,
 277                                    sizeof(tinfo)))
 278                         return -EFAULT;
 279
 280                 ret = hfi1_user_exp_rcv_clear(fp, &tinfo);
 281                 if (ret)
 282                         break;
 283                 addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
 284                 if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
 285                                  sizeof(tinfo.tidcnt)))
 286                         ret = -EFAULT;
 287                 break;
 288
 289         case HFI1_IOCTL_TID_INVAL_READ:
 290                 if (copy_from_user(&tinfo,
 291                                    (struct hfi11_tid_info __user *)arg,
 292                                    sizeof(tinfo)))
 293                         return -EFAULT;
 294
 295                 ret = hfi1_user_exp_rcv_invalid(fp, &tinfo);
 296                 if (ret)
 297                         break;
 298                 addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
 299                 if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
 300                                  sizeof(tinfo.tidcnt)))
 301                         ret = -EFAULT;
 302                 break;
 303
 304         case HFI1_IOCTL_RECV_CTRL:
 305                 ret = get_user(uval, (int __user *)arg);
 306                 if (ret != 0)
 307                         return -EFAULT;
 308                 ret = manage_rcvq(uctxt, fd->subctxt, uval);
 309                 break;
 310
 311         case HFI1_IOCTL_POLL_TYPE:
 312                 ret = get_user(uval, (int __user *)arg);
 313                 if (ret != 0)
 314                         return -EFAULT;
 315                 uctxt->poll_type = (typeof(uctxt->poll_type))uval;
 316                 break;
 317
 318         case HFI1_IOCTL_ACK_EVENT:
 319                 ret = get_user(ul_uval, (unsigned long __user *)arg);
 320                 if (ret != 0)
 321                         return -EFAULT;
 322                 ret = user_event_ack(uctxt, fd->subctxt, ul_uval);
 323                 break;
 324
 325         case HFI1_IOCTL_SET_PKEY:
 326                 ret = get_user(uval16, (u16 __user *)arg);
 327                 if (ret != 0)
 328                         return -EFAULT;
 329                 if (HFI1_CAP_IS_USET(PKEY_CHECK))
 330                         ret = set_ctxt_pkey(uctxt, fd->subctxt, uval16);
 331                 else
 332                         return -EPERM;
 333                 break;
 334
 335         case HFI1_IOCTL_CTXT_RESET: {
 336                 struct send_context *sc;
 337                 struct hfi1_devdata *dd;
 338
 339                 if (!uctxt || !uctxt->dd || !uctxt->sc)
 340                         return -EINVAL;
 341
 342                 /*
 343                  * There is no protection here. User level has to
 344                  * guarantee that no one will be writing to the send
 345                  * context while it is being re-initialized.
 346                  * If user level breaks that guarantee, it will break
 347                  * it's own context and no one else's.
 348                  */
 349                 dd = uctxt->dd;
 350                 sc = uctxt->sc;
 351                 /*
 352                  * Wait until the interrupt handler has marked the
 353                  * context as halted or frozen. Report error if we time
 354                  * out.
 355                  */
 356                 wait_event_interruptible_timeout(
 357                         sc->halt_wait, (sc->flags & SCF_HALTED),
 358                         msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
 359                 if (!(sc->flags & SCF_HALTED))
 360                         return -ENOLCK;
 361
 362                 /*
 363                  * If the send context was halted due to a Freeze,
 364                  * wait until the device has been "unfrozen" before
 365                  * resetting the context.
 366                  */
 367                 if (sc->flags & SCF_FROZEN) {
 368                         wait_event_interruptible_timeout(
 369                                 dd->event_queue,
 370                                 !(ACCESS_ONCE(dd->flags) & HFI1_FROZEN),
 371                                 msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
 372                         if (dd->flags & HFI1_FROZEN)
 373                                 return -ENOLCK;
 374
 375                         if (dd->flags & HFI1_FORCED_FREEZE)
 376                                 /*
 377                                  * Don't allow context reset if we are into
 378                                  * forced freeze
 379                                  */
 380                                 return -ENODEV;
 381
 382                         sc_disable(sc);
 383                         ret = sc_enable(sc);
 384                         hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_ENB,
 385                                      uctxt->ctxt);
 386                 } else {
 387                         ret = sc_restart(sc);
 388                 }
 389                 if (!ret)
 390                         sc_return_credits(sc);
 391                 break;
 392         }
 393
 394         case HFI1_IOCTL_GET_VERS:
 395                 uval = HFI1_USER_SWVERSION;
 396                 if (put_user(uval, (int __user *)arg))
 397                         return -EFAULT;
 398                 break;
 399
 400         default:
 401                 return -EINVAL;
 402         }
 403
 404         return ret;
 405 }
 406
 407 static ssize_t hfi1_write_iter(struct kiocb *kiocb, struct iov_iter *from)
 408 {
 409         struct hfi1_filedata *fd = kiocb->ki_filp->private_data;
 410         struct hfi1_user_sdma_pkt_q *pq = fd->pq;
 411         struct hfi1_user_sdma_comp_q *cq = fd->cq;
 412         int done = 0, reqs = 0;
 413         unsigned long dim = from->nr_segs;
 414
 415         if (!cq || !pq)
 416                 return -EIO;
 417
 418         if (!iter_is_iovec(from) || !dim)
 419                 return -EINVAL;
 420
 421         hfi1_cdbg(SDMA, "SDMA request from %u:%u (%lu)",
 422                   fd->uctxt->ctxt, fd->subctxt, dim);
 423
 424         if (atomic_read(&pq->n_reqs) == pq->n_max_reqs)
 425                 return -ENOSPC;
 426
 427         while (dim) {
 428                 int ret;
 429                 unsigned long count = 0;
 430
 431                 ret = hfi1_user_sdma_process_request(
 432                         kiocb->ki_filp, (struct iovec *)(from->iov + done),
 433                         dim, &count);
 434                 if (ret) {
 435                         reqs = ret;
 436                         break;
 437                 }
 438                 dim -= count;
 439                 done += count;
 440                 reqs++;
 441         }
 442
 443         return reqs;
 444 }
 445
 446 static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
 447 {
 448         struct hfi1_filedata *fd = fp->private_data;
 449         struct hfi1_ctxtdata *uctxt = fd->uctxt;
 450         struct hfi1_devdata *dd;
 451         unsigned long flags;
 452         u64 token = vma->vm_pgoff << PAGE_SHIFT,
 453                 memaddr = 0;
 454         void *memvirt = NULL;
 455         u8 subctxt, mapio = 0, vmf = 0, type;
 456         ssize_t memlen = 0;
 457         int ret = 0;
 458         u16 ctxt;
 459
 460         if (!is_valid_mmap(token) || !uctxt ||
 461             !(vma->vm_flags & VM_SHARED)) {
 462                 ret = -EINVAL;
 463                 goto done;
 464         }
 465         dd = uctxt->dd;
 466         ctxt = HFI1_MMAP_TOKEN_GET(CTXT, token);
 467         subctxt = HFI1_MMAP_TOKEN_GET(SUBCTXT, token);
 468         type = HFI1_MMAP_TOKEN_GET(TYPE, token);
 469         if (ctxt != uctxt->ctxt || subctxt != fd->subctxt) {
 470                 ret = -EINVAL;
 471                 goto done;
 472         }
 473
 474         flags = vma->vm_flags;
 475
 476         switch (type) {
 477         case PIO_BUFS:
 478         case PIO_BUFS_SOP:
 479                 memaddr = ((dd->physaddr + TXE_PIO_SEND) +
 480                                 /* chip pio base */
 481                            (uctxt->sc->hw_context * BIT(16))) +
 482                                 /* 64K PIO space / ctxt */
 483                         (type == PIO_BUFS_SOP ?
 484                                 (TXE_PIO_SIZE / 2) : 0); /* sop? */
 485                 /*
 486                  * Map only the amount allocated to the context, not the
 487                  * entire available context's PIO space.
 488                  */
 489                 memlen = PAGE_ALIGN(uctxt->sc->credits * PIO_BLOCK_SIZE);
 490                 flags &= ~VM_MAYREAD;
 491                 flags |= VM_DONTCOPY | VM_DONTEXPAND;
 492                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 493                 mapio = 1;
 494                 break;
 495         case PIO_CRED:
 496                 if (flags & VM_WRITE) {
 497                         ret = -EPERM;
 498                         goto done;
 499                 }
 500                 /*
 501                  * The credit return location for this context could be on the
 502                  * second or third page allocated for credit returns (if number
 503                  * of enabled contexts > 64 and 128 respectively).
 504                  */
 505                 memvirt = dd->cr_base[uctxt->numa_id].va;
 506                 memaddr = virt_to_phys(memvirt) +
 507                         (((u64)uctxt->sc->hw_free -
 508                           (u64)dd->cr_base[uctxt->numa_id].va) & PAGE_MASK);
 509                 memlen = PAGE_SIZE;
 510                 flags &= ~VM_MAYWRITE;
 511                 flags |= VM_DONTCOPY | VM_DONTEXPAND;
 512                 /*
 513                  * The driver has already allocated memory for credit
 514                  * returns and programmed it into the chip. Has that
 515                  * memory been flagged as non-cached?
 516                  */
 517                 /* vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); */
 518                 mapio = 1;
 519                 break;
 520         case RCV_HDRQ:
 521                 memlen = uctxt->rcvhdrq_size;
 522                 memvirt = uctxt->rcvhdrq;
 523                 break;
 524         case RCV_EGRBUF: {
 525                 unsigned long addr;
 526                 int i;
 527                 /*
 528                  * The RcvEgr buffer need to be handled differently
 529                  * as multiple non-contiguous pages need to be mapped
 530                  * into the user process.
 531                  */
 532                 memlen = uctxt->egrbufs.size;
 533                 if ((vma->vm_end - vma->vm_start) != memlen) {
 534                         dd_dev_err(dd, "Eager buffer map size invalid (%lu != %lu)\n",
 535                                    (vma->vm_end - vma->vm_start), memlen);
 536                         ret = -EINVAL;
 537                         goto done;
 538                 }
 539                 if (vma->vm_flags & VM_WRITE) {
 540                         ret = -EPERM;
 541                         goto done;
 542                 }
 543                 vma->vm_flags &= ~VM_MAYWRITE;
 544                 addr = vma->vm_start;
 545                 for (i = 0 ; i < uctxt->egrbufs.numbufs; i++) {
 546                         memlen = uctxt->egrbufs.buffers[i].len;
 547                         memvirt = uctxt->egrbufs.buffers[i].addr;
 548                         ret = remap_pfn_range(
 549                                 vma, addr,
 550                                 /*
 551                                  * virt_to_pfn() does the same, but
 552                                  * it's not available on x86_64
 553                                  * when CONFIG_MMU is enabled.
 554                                  */
 555                                 PFN_DOWN(__pa(memvirt)),
 556                                 memlen,
 557                                 vma->vm_page_prot);
 558                         if (ret < 0)
 559                                 goto done;
 560                         addr += memlen;
 561                 }
 562                 ret = 0;
 563                 goto done;
 564         }
 565         case UREGS:
 566                 /*
 567                  * Map only the page that contains this context's user
 568                  * registers.
 569                  */
 570                 memaddr = (unsigned long)
 571                         (dd->physaddr + RXE_PER_CONTEXT_USER)
 572                         + (uctxt->ctxt * RXE_PER_CONTEXT_SIZE);
 573                 /*
 574                  * TidFlow table is on the same page as the rest of the
 575                  * user registers.
 576                  */
 577                 memlen = PAGE_SIZE;
 578                 flags |= VM_DONTCOPY | VM_DONTEXPAND;
 579                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 580                 mapio = 1;
 581                 break;
 582         case EVENTS:
 583                 /*
 584                  * Use the page where this context's flags are. User level
 585                  * knows where it's own bitmap is within the page.
 586                  */
 587                 memaddr = (unsigned long)(dd->events +
 588                                           ((uctxt->ctxt - dd->first_user_ctxt) *
 589                                            HFI1_MAX_SHARED_CTXTS)) & PAGE_MASK;
 590                 memlen = PAGE_SIZE;
 591                 /*
 592                  * v3.7 removes VM_RESERVED but the effect is kept by
 593                  * using VM_IO.
 594                  */
 595                 flags |= VM_IO | VM_DONTEXPAND;
 596                 vmf = 1;
 597                 break;
 598         case STATUS:
 599                 memaddr = kvirt_to_phys((void *)dd->status);
 600                 memlen = PAGE_SIZE;
 601                 flags |= VM_IO | VM_DONTEXPAND;
 602                 break;
 603         case RTAIL:
 604                 if (!HFI1_CAP_IS_USET(DMA_RTAIL)) {
 605                         /*
 606                          * If the memory allocation failed, the context alloc
 607                          * also would have failed, so we would never get here
 608                          */
 609                         ret = -EINVAL;
 610                         goto done;
 611                 }
 612                 if (flags & VM_WRITE) {
 613                         ret = -EPERM;
 614                         goto done;
 615                 }
 616                 memlen = PAGE_SIZE;
 617                 memvirt = (void *)uctxt->rcvhdrtail_kvaddr;
 618                 flags &= ~VM_MAYWRITE;
 619                 break;
 620         case SUBCTXT_UREGS:
 621                 memaddr = (u64)uctxt->subctxt_uregbase;
 622                 memlen = PAGE_SIZE;
 623                 flags |= VM_IO | VM_DONTEXPAND;
 624                 vmf = 1;
 625                 break;
 626         case SUBCTXT_RCV_HDRQ:
 627                 memaddr = (u64)uctxt->subctxt_rcvhdr_base;
 628                 memlen = uctxt->rcvhdrq_size * uctxt->subctxt_cnt;
 629                 flags |= VM_IO | VM_DONTEXPAND;
 630                 vmf = 1;
 631                 break;
 632         case SUBCTXT_EGRBUF:
 633                 memaddr = (u64)uctxt->subctxt_rcvegrbuf;
 634                 memlen = uctxt->egrbufs.size * uctxt->subctxt_cnt;
 635                 flags |= VM_IO | VM_DONTEXPAND;
 636                 flags &= ~VM_MAYWRITE;
 637                 vmf = 1;
 638                 break;
 639         case SDMA_COMP: {
 640                 struct hfi1_user_sdma_comp_q *cq = fd->cq;
 641
 642                 if (!cq) {
 643                         ret = -EFAULT;
 644                         goto done;
 645                 }
 646                 memaddr = (u64)cq->comps;
 647                 memlen = PAGE_ALIGN(sizeof(*cq->comps) * cq->nentries);
 648                 flags |= VM_IO | VM_DONTEXPAND;
 649                 vmf = 1;
 650                 break;
 651         }
 652         default:
 653                 ret = -EINVAL;
 654                 break;
 655         }
 656
 657         if ((vma->vm_end - vma->vm_start) != memlen) {
 658                 hfi1_cdbg(PROC, "%u:%u Memory size mismatch %lu:%lu",
 659                           uctxt->ctxt, fd->subctxt,
 660                           (vma->vm_end - vma->vm_start), memlen);
 661                 ret = -EINVAL;
 662                 goto done;
 663         }
 664
 665         vma->vm_flags = flags;
 666         hfi1_cdbg(PROC,
 667                   "%u:%u type:%u io/vf:%d/%d, addr:0x%llx, len:%lu(%lu), flags:0x%lx\n",
 668                     ctxt, subctxt, type, mapio, vmf, memaddr, memlen,
 669                     vma->vm_end - vma->vm_start, vma->vm_flags);
 670         if (vmf) {
 671                 vma->vm_pgoff = PFN_DOWN(memaddr);
 672                 vma->vm_ops = &vm_ops;
 673                 ret = 0;
 674         } else if (mapio) {
 675                 ret = io_remap_pfn_range(vma, vma->vm_start,
 676                                          PFN_DOWN(memaddr),
 677                                          memlen,
 678                                          vma->vm_page_prot);
 679         } else if (memvirt) {
 680                 ret = remap_pfn_range(vma, vma->vm_start,
 681                                       PFN_DOWN(__pa(memvirt)),
 682                                       memlen,
 683                                       vma->vm_page_prot);
 684         } else {
 685                 ret = remap_pfn_range(vma, vma->vm_start,
 686                                       PFN_DOWN(memaddr),
 687                                       memlen,
 688                                       vma->vm_page_prot);
 689         }
 690 done:
 691         return ret;
 692 }
 693
 694 /*
 695  * Local (non-chip) user memory is not mapped right away but as it is
 696  * accessed by the user-level code.
 697  */
 698 static int vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 699 {
 700         struct page *page;
 701
 702         page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT));
 703         if (!page)
 704                 return VM_FAULT_SIGBUS;
 705
 706         get_page(page);
 707         vmf->page = page;
 708
 709         return 0;
 710 }
 711
 712 static unsigned int hfi1_poll(struct file *fp, struct poll_table_struct *pt)
 713 {
 714         struct hfi1_ctxtdata *uctxt;
 715         unsigned pollflag;
 716
 717         uctxt = ((struct hfi1_filedata *)fp->private_data)->uctxt;
 718         if (!uctxt)
 719                 pollflag = POLLERR;
 720         else if (uctxt->poll_type == HFI1_POLL_TYPE_URGENT)
 721                 pollflag = poll_urgent(fp, pt);
 722         else  if (uctxt->poll_type == HFI1_POLL_TYPE_ANYRCV)
 723                 pollflag = poll_next(fp, pt);
 724         else /* invalid */
 725                 pollflag = POLLERR;
 726
 727         return pollflag;
 728 }
 729
 730 static int hfi1_file_close(struct inode *inode, struct file *fp)
 731 {
 732         struct hfi1_filedata *fdata = fp->private_data;
 733         struct hfi1_ctxtdata *uctxt = fdata->uctxt;
 734         struct hfi1_devdata *dd = container_of(inode->i_cdev,
 735                                                struct hfi1_devdata,
 736                                                user_cdev);
 737         unsigned long flags, *ev;
 738
 739         fp->private_data = NULL;
 740
 741         if (!uctxt)
 742                 goto done;
 743
 744         hfi1_cdbg(PROC, "freeing ctxt %u:%u", uctxt->ctxt, fdata->subctxt);
 745         mutex_lock(&hfi1_mutex);
 746
 747         flush_wc();
 748         /* drain user sdma queue */
 749         hfi1_user_sdma_free_queues(fdata);
 750
 751         /* release the cpu */
 752         hfi1_put_proc_affinity(fdata->rec_cpu_num);
 753
 754         /*
 755          * Clear any left over, unhandled events so the next process that
 756          * gets this context doesn't get confused.
 757          */
 758         ev = dd->events + ((uctxt->ctxt - dd->first_user_ctxt) *
 759                            HFI1_MAX_SHARED_CTXTS) + fdata->subctxt;
 760         *ev = 0;
 761
 762         if (--uctxt->cnt) {
 763                 uctxt->active_slaves &= ~(1 << fdata->subctxt);
 764                 mutex_unlock(&hfi1_mutex);
 765                 goto done;
 766         }
 767
 768         spin_lock_irqsave(&dd->uctxt_lock, flags);
 769         /*
 770          * Disable receive context and interrupt available, reset all
 771          * RcvCtxtCtrl bits to default values.
 772          */
 773         hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_DIS |
 774                      HFI1_RCVCTRL_TIDFLOW_DIS |
 775                      HFI1_RCVCTRL_INTRAVAIL_DIS |
 776                      HFI1_RCVCTRL_TAILUPD_DIS |
 777                      HFI1_RCVCTRL_ONE_PKT_EGR_DIS |
 778                      HFI1_RCVCTRL_NO_RHQ_DROP_DIS |
 779                      HFI1_RCVCTRL_NO_EGR_DROP_DIS, uctxt->ctxt);
 780         /* Clear the context's J_KEY */
 781         hfi1_clear_ctxt_jkey(dd, uctxt->ctxt);
 782         /*
 783          * Reset context integrity checks to default.
 784          * (writes to CSRs probably belong in chip.c)
 785          */
 786         write_kctxt_csr(dd, uctxt->sc->hw_context, SEND_CTXT_CHECK_ENABLE,
 787                         hfi1_pkt_default_send_ctxt_mask(dd, uctxt->sc->type));
 788         sc_disable(uctxt->sc);
 789         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 790
 791         dd->rcd[uctxt->ctxt] = NULL;
 792
 793         hfi1_user_exp_rcv_free(fdata);
 794         hfi1_clear_ctxt_pkey(dd, uctxt->ctxt);
 795
 796         uctxt->rcvwait_to = 0;
 797         uctxt->piowait_to = 0;
 798         uctxt->rcvnowait = 0;
 799         uctxt->pionowait = 0;
 800         uctxt->event_flags = 0;
 801
 802         hfi1_stats.sps_ctxts--;
 803         if (++dd->freectxts == dd->num_user_contexts)
 804                 aspm_enable_all(dd);
 805         mutex_unlock(&hfi1_mutex);
 806         hfi1_free_ctxtdata(dd, uctxt);
 807 done:
 808         mmdrop(fdata->mm);
 809         kobject_put(&dd->kobj);
 810
 811         if (atomic_dec_and_test(&dd->user_refcount))
 812                 complete(&dd->user_comp);
 813
 814         kfree(fdata);
 815         return 0;
 816 }
 817
 818 /*
 819  * Convert kernel *virtual* addresses to physical addresses.
 820  * This is used to vmalloc'ed addresses.
 821  */
 822 static u64 kvirt_to_phys(void *addr)
 823 {
 824         struct page *page;
 825         u64 paddr = 0;
 826
 827         page = vmalloc_to_page(addr);
 828         if (page)
 829                 paddr = page_to_pfn(page) << PAGE_SHIFT;
 830
 831         return paddr;
 832 }
 833
 834 static int assign_ctxt(struct file *fp, struct hfi1_user_info *uinfo)
 835 {
 836         int i_minor, ret = 0;
 837         unsigned int swmajor, swminor;
 838
 839         swmajor = uinfo->userversion >> 16;
 840         if (swmajor != HFI1_USER_SWMAJOR) {
 841                 ret = -ENODEV;
 842                 goto done;
 843         }
 844
 845         swminor = uinfo->userversion & 0xffff;
 846
 847         mutex_lock(&hfi1_mutex);
 848         /* First, lets check if we need to setup a shared context? */
 849         if (uinfo->subctxt_cnt) {
 850                 struct hfi1_filedata *fd = fp->private_data;
 851
 852                 ret = find_shared_ctxt(fp, uinfo);
 853                 if (ret < 0)
 854                         goto done_unlock;
 855                 if (ret) {
 856                         fd->rec_cpu_num =
 857                                 hfi1_get_proc_affinity(fd->uctxt->numa_id);
 858                 }
 859         }
 860
 861         /*
 862          * We execute the following block if we couldn't find a
 863          * shared context or if context sharing is not required.
 864          */
 865         if (!ret) {
 866                 i_minor = iminor(file_inode(fp)) - HFI1_USER_MINOR_BASE;
 867                 ret = get_user_context(fp, uinfo, i_minor);
 868         }
 869 done_unlock:
 870         mutex_unlock(&hfi1_mutex);
 871 done:
 872         return ret;
 873 }
 874
 875 static int get_user_context(struct file *fp, struct hfi1_user_info *uinfo,
 876                             int devno)
 877 {
 878         struct hfi1_devdata *dd = NULL;
 879         int devmax, npresent, nup;
 880
 881         devmax = hfi1_count_units(&npresent, &nup);
 882         if (!npresent)
 883                 return -ENXIO;
 884
 885         if (!nup)
 886                 return -ENETDOWN;
 887
 888         dd = hfi1_lookup(devno);
 889         if (!dd)
 890                 return -ENODEV;
 891         else if (!dd->freectxts)
 892                 return -EBUSY;
 893
 894         return allocate_ctxt(fp, dd, uinfo);
 895 }
 896
 897 static int find_shared_ctxt(struct file *fp,
 898                             const struct hfi1_user_info *uinfo)
 899 {
 900         int devmax, ndev, i;
 901         int ret = 0;
 902         struct hfi1_filedata *fd = fp->private_data;
 903
 904         devmax = hfi1_count_units(NULL, NULL);
 905
 906         for (ndev = 0; ndev < devmax; ndev++) {
 907                 struct hfi1_devdata *dd = hfi1_lookup(ndev);
 908
 909                 if (!(dd && (dd->flags & HFI1_PRESENT) && dd->kregbase))
 910                         continue;
 911                 for (i = dd->first_user_ctxt; i < dd->num_rcv_contexts; i++) {
 912                         struct hfi1_ctxtdata *uctxt = dd->rcd[i];
 913
 914                         /* Skip ctxts which are not yet open */
 915                         if (!uctxt || !uctxt->cnt)
 916                                 continue;
 917                         /* Skip ctxt if it doesn't match the requested one */
 918                         if (memcmp(uctxt->uuid, uinfo->uuid,
 919                                    sizeof(uctxt->uuid)) ||
 920                             uctxt->jkey != generate_jkey(current_uid()) ||
 921                             uctxt->subctxt_id != uinfo->subctxt_id ||
 922                             uctxt->subctxt_cnt != uinfo->subctxt_cnt)
 923                                 continue;
 924
 925                         /* Verify the sharing process matches the master */
 926                         if (uctxt->userversion != uinfo->userversion ||
 927                             uctxt->cnt >= uctxt->subctxt_cnt) {
 928                                 ret = -EINVAL;
 929                                 goto done;
 930                         }
 931                         fd->uctxt = uctxt;
 932                         fd->subctxt  = uctxt->cnt++;
 933                         uctxt->active_slaves |= 1 << fd->subctxt;
 934                         ret = 1;
 935                         goto done;
 936                 }
 937         }
 938
 939 done:
 940         return ret;
 941 }
 942
 943 static int allocate_ctxt(struct file *fp, struct hfi1_devdata *dd,
 944                          struct hfi1_user_info *uinfo)
 945 {
 946         struct hfi1_filedata *fd = fp->private_data;
 947         struct hfi1_ctxtdata *uctxt;
 948         unsigned ctxt;
 949         int ret, numa;
 950
 951         if (dd->flags & HFI1_FROZEN) {
 952                 /*
 953                  * Pick an error that is unique from all other errors
 954                  * that are returned so the user process knows that
 955                  * it tried to allocate while the SPC was frozen.  It
 956                  * it should be able to retry with success in a short
 957                  * while.
 958                  */
 959                 return -EIO;
 960         }
 961
 962         for (ctxt = dd->first_user_ctxt; ctxt < dd->num_rcv_contexts; ctxt++)
 963                 if (!dd->rcd[ctxt])
 964                         break;
 965
 966         if (ctxt == dd->num_rcv_contexts)
 967                 return -EBUSY;
 968
 969         /*
 970          * If we don't have a NUMA node requested, preference is towards
 971          * device NUMA node.
 972          */
 973         fd->rec_cpu_num = hfi1_get_proc_affinity(dd->node);
 974         if (fd->rec_cpu_num != -1)
 975                 numa = cpu_to_node(fd->rec_cpu_num);
 976         else
 977                 numa = numa_node_id();
 978         uctxt = hfi1_create_ctxtdata(dd->pport, ctxt, numa);
 979         if (!uctxt) {
 980                 dd_dev_err(dd,
 981                            "Unable to allocate ctxtdata memory, failing open\n");
 982                 return -ENOMEM;
 983         }
 984         hfi1_cdbg(PROC, "[%u:%u] pid %u assigned to CPU %d (NUMA %u)",
 985                   uctxt->ctxt, fd->subctxt, current->pid, fd->rec_cpu_num,
 986                   uctxt->numa_id);
 987
 988         /*
 989          * Allocate and enable a PIO send context.
 990          */
 991         uctxt->sc = sc_alloc(dd, SC_USER, uctxt->rcvhdrqentsize,
 992                              uctxt->dd->node);
 993         if (!uctxt->sc) {
 994                 ret = -ENOMEM;
 995                 goto ctxdata_free;
 996         }
 997         hfi1_cdbg(PROC, "allocated send context %u(%u)\n", uctxt->sc->sw_index,
 998                   uctxt->sc->hw_context);
 999         ret = sc_enable(uctxt->sc);
1000         if (ret)
1001                 goto ctxdata_free;
1002
1003         /*
1004          * Setup shared context resources if the user-level has requested
1005          * shared contexts and this is the 'master' process.
1006          * This has to be done here so the rest of the sub-contexts find the
1007          * proper master.
1008          */
1009         if (uinfo->subctxt_cnt && !fd->subctxt) {
1010                 ret = init_subctxts(uctxt, uinfo);
1011                 /*
1012                  * On error, we don't need to disable and de-allocate the
1013                  * send context because it will be done during file close
1014                  */
1015                 if (ret)
1016                         goto ctxdata_free;
1017         }
1018         uctxt->userversion = uinfo->userversion;
1019         uctxt->flags = hfi1_cap_mask; /* save current flag state */
1020         init_waitqueue_head(&uctxt->wait);
1021         strlcpy(uctxt->comm, current->comm, sizeof(uctxt->comm));
1022         memcpy(uctxt->uuid, uinfo->uuid, sizeof(uctxt->uuid));
1023         uctxt->jkey = generate_jkey(current_uid());
1024         INIT_LIST_HEAD(&uctxt->sdma_queues);
1025         spin_lock_init(&uctxt->sdma_qlock);
1026         hfi1_stats.sps_ctxts++;
1027         /*
1028          * Disable ASPM when there are open user/PSM contexts to avoid
1029          * issues with ASPM L1 exit latency
1030          */
1031         if (dd->freectxts-- == dd->num_user_contexts)
1032                 aspm_disable_all(dd);
1033         fd->uctxt = uctxt;
1034
1035         return 0;
1036
1037 ctxdata_free:
1038         dd->rcd[ctxt] = NULL;
1039         hfi1_free_ctxtdata(dd, uctxt);
1040         return ret;
1041 }
1042
1043 static int init_subctxts(struct hfi1_ctxtdata *uctxt,
1044                          const struct hfi1_user_info *uinfo)
1045 {
1046         unsigned num_subctxts;
1047
1048         num_subctxts = uinfo->subctxt_cnt;
1049         if (num_subctxts > HFI1_MAX_SHARED_CTXTS)
1050                 return -EINVAL;
1051
1052         uctxt->subctxt_cnt = uinfo->subctxt_cnt;
1053         uctxt->subctxt_id = uinfo->subctxt_id;
1054         uctxt->active_slaves = 1;
1055         uctxt->redirect_seq_cnt = 1;
1056         set_bit(HFI1_CTXT_MASTER_UNINIT, &uctxt->event_flags);
1057
1058         return 0;
1059 }
1060
1061 static int setup_subctxt(struct hfi1_ctxtdata *uctxt)
1062 {
1063         int ret = 0;
1064         unsigned num_subctxts = uctxt->subctxt_cnt;
1065
1066         uctxt->subctxt_uregbase = vmalloc_user(PAGE_SIZE);
1067         if (!uctxt->subctxt_uregbase) {
1068                 ret = -ENOMEM;
1069                 goto bail;
1070         }
1071         /* We can take the size of the RcvHdr Queue from the master */
1072         uctxt->subctxt_rcvhdr_base = vmalloc_user(uctxt->rcvhdrq_size *
1073                                                   num_subctxts);
1074         if (!uctxt->subctxt_rcvhdr_base) {
1075                 ret = -ENOMEM;
1076                 goto bail_ureg;
1077         }
1078
1079         uctxt->subctxt_rcvegrbuf = vmalloc_user(uctxt->egrbufs.size *
1080                                                 num_subctxts);
1081         if (!uctxt->subctxt_rcvegrbuf) {
1082                 ret = -ENOMEM;
1083                 goto bail_rhdr;
1084         }
1085         goto bail;
1086 bail_rhdr:
1087         vfree(uctxt->subctxt_rcvhdr_base);
1088 bail_ureg:
1089         vfree(uctxt->subctxt_uregbase);
1090         uctxt->subctxt_uregbase = NULL;
1091 bail:
1092         return ret;
1093 }
1094
1095 static int user_init(struct file *fp)
1096 {
1097         unsigned int rcvctrl_ops = 0;
1098         struct hfi1_filedata *fd = fp->private_data;
1099         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1100
1101         /* make sure that the context has already been setup */
1102         if (!test_bit(HFI1_CTXT_SETUP_DONE, &uctxt->event_flags))
1103                 return -EFAULT;
1104
1105         /* initialize poll variables... */
1106         uctxt->urgent = 0;
1107         uctxt->urgent_poll = 0;
1108
1109         /*
1110          * Now enable the ctxt for receive.
1111          * For chips that are set to DMA the tail register to memory
1112          * when they change (and when the update bit transitions from
1113          * 0 to 1.  So for those chips, we turn it off and then back on.
1114          * This will (very briefly) affect any other open ctxts, but the
1115          * duration is very short, and therefore isn't an issue.  We
1116          * explicitly set the in-memory tail copy to 0 beforehand, so we
1117          * don't have to wait to be sure the DMA update has happened
1118          * (chip resets head/tail to 0 on transition to enable).
1119          */
1120         if (uctxt->rcvhdrtail_kvaddr)
1121                 clear_rcvhdrtail(uctxt);
1122
1123         /* Setup J_KEY before enabling the context */
1124         hfi1_set_ctxt_jkey(uctxt->dd, uctxt->ctxt, uctxt->jkey);
1125
1126         rcvctrl_ops = HFI1_RCVCTRL_CTXT_ENB;
1127         if (HFI1_CAP_UGET_MASK(uctxt->flags, HDRSUPP))
1128                 rcvctrl_ops |= HFI1_RCVCTRL_TIDFLOW_ENB;
1129         /*
1130          * Ignore the bit in the flags for now until proper
1131          * support for multiple packet per rcv array entry is
1132          * added.
1133          */
1134         if (!HFI1_CAP_UGET_MASK(uctxt->flags, MULTI_PKT_EGR))
1135                 rcvctrl_ops |= HFI1_RCVCTRL_ONE_PKT_EGR_ENB;
1136         if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_EGR_FULL))
1137                 rcvctrl_ops |= HFI1_RCVCTRL_NO_EGR_DROP_ENB;
1138         if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_RHQ_FULL))
1139                 rcvctrl_ops |= HFI1_RCVCTRL_NO_RHQ_DROP_ENB;
1140         /*
1141          * The RcvCtxtCtrl.TailUpd bit has to be explicitly written.
1142          * We can't rely on the correct value to be set from prior
1143          * uses of the chip or ctxt. Therefore, add the rcvctrl op
1144          * for both cases.
1145          */
1146         if (HFI1_CAP_UGET_MASK(uctxt->flags, DMA_RTAIL))
1147                 rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_ENB;
1148         else
1149                 rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_DIS;
1150         hfi1_rcvctrl(uctxt->dd, rcvctrl_ops, uctxt->ctxt);
1151
1152         /* Notify any waiting slaves */
1153         if (uctxt->subctxt_cnt) {
1154                 clear_bit(HFI1_CTXT_MASTER_UNINIT, &uctxt->event_flags);
1155                 wake_up(&uctxt->wait);
1156         }
1157
1158         return 0;
1159 }
1160
1161 static int get_ctxt_info(struct file *fp, void __user *ubase, __u32 len)
1162 {
1163         struct hfi1_ctxt_info cinfo;
1164         struct hfi1_filedata *fd = fp->private_data;
1165         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1166         int ret = 0;
1167
1168         memset(&cinfo, 0, sizeof(cinfo));
1169         cinfo.runtime_flags = (((uctxt->flags >> HFI1_CAP_MISC_SHIFT) &
1170                                 HFI1_CAP_MISC_MASK) << HFI1_CAP_USER_SHIFT) |
1171                         HFI1_CAP_UGET_MASK(uctxt->flags, MASK) |
1172                         HFI1_CAP_KGET_MASK(uctxt->flags, K2U);
1173         /* adjust flag if this fd is not able to cache */
1174         if (!fd->handler)
1175                 cinfo.runtime_flags |= HFI1_CAP_TID_UNMAP; /* no caching */
1176
1177         cinfo.num_active = hfi1_count_active_units();
1178         cinfo.unit = uctxt->dd->unit;
1179         cinfo.ctxt = uctxt->ctxt;
1180         cinfo.subctxt = fd->subctxt;
1181         cinfo.rcvtids = roundup(uctxt->egrbufs.alloced,
1182                                 uctxt->dd->rcv_entries.group_size) +
1183                 uctxt->expected_count;
1184         cinfo.credits = uctxt->sc->credits;
1185         cinfo.numa_node = uctxt->numa_id;
1186         cinfo.rec_cpu = fd->rec_cpu_num;
1187         cinfo.send_ctxt = uctxt->sc->hw_context;
1188
1189         cinfo.egrtids = uctxt->egrbufs.alloced;
1190         cinfo.rcvhdrq_cnt = uctxt->rcvhdrq_cnt;
1191         cinfo.rcvhdrq_entsize = uctxt->rcvhdrqentsize << 2;
1192         cinfo.sdma_ring_size = fd->cq->nentries;
1193         cinfo.rcvegr_size = uctxt->egrbufs.rcvtid_size;
1194
1195         trace_hfi1_ctxt_info(uctxt->dd, uctxt->ctxt, fd->subctxt, cinfo);
1196         if (copy_to_user(ubase, &cinfo, sizeof(cinfo)))
1197                 ret = -EFAULT;
1198
1199         return ret;
1200 }
1201
1202 static int setup_ctxt(struct file *fp)
1203 {
1204         struct hfi1_filedata *fd = fp->private_data;
1205         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1206         struct hfi1_devdata *dd = uctxt->dd;
1207         int ret = 0;
1208
1209         /*
1210          * Context should be set up only once, including allocation and
1211          * programming of eager buffers. This is done if context sharing
1212          * is not requested or by the master process.
1213          */
1214         if (!uctxt->subctxt_cnt || !fd->subctxt) {
1215                 ret = hfi1_init_ctxt(uctxt->sc);
1216                 if (ret)
1217                         goto done;
1218
1219                 /* Now allocate the RcvHdr queue and eager buffers. */
1220                 ret = hfi1_create_rcvhdrq(dd, uctxt);
1221                 if (ret)
1222                         goto done;
1223                 ret = hfi1_setup_eagerbufs(uctxt);
1224                 if (ret)
1225                         goto done;
1226                 if (uctxt->subctxt_cnt && !fd->subctxt) {
1227                         ret = setup_subctxt(uctxt);
1228                         if (ret)
1229                                 goto done;
1230                 }
1231         } else {
1232                 ret = wait_event_interruptible(uctxt->wait, !test_bit(
1233                                                HFI1_CTXT_MASTER_UNINIT,
1234                                                &uctxt->event_flags));
1235                 if (ret)
1236                         goto done;
1237         }
1238
1239         ret = hfi1_user_sdma_alloc_queues(uctxt, fp);
1240         if (ret)
1241                 goto done;
1242         /*
1243          * Expected receive has to be setup for all processes (including
1244          * shared contexts). However, it has to be done after the master
1245          * context has been fully configured as it depends on the
1246          * eager/expected split of the RcvArray entries.
1247          * Setting it up here ensures that the subcontexts will be waiting
1248          * (due to the above wait_event_interruptible() until the master
1249          * is setup.
1250          */
1251         ret = hfi1_user_exp_rcv_init(fp);
1252         if (ret)
1253                 goto done;
1254
1255         set_bit(HFI1_CTXT_SETUP_DONE, &uctxt->event_flags);
1256 done:
1257         return ret;
1258 }
1259
1260 static int get_base_info(struct file *fp, void __user *ubase, __u32 len)
1261 {
1262         struct hfi1_base_info binfo;
1263         struct hfi1_filedata *fd = fp->private_data;
1264         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1265         struct hfi1_devdata *dd = uctxt->dd;
1266         ssize_t sz;
1267         unsigned offset;
1268         int ret = 0;
1269
1270         trace_hfi1_uctxtdata(uctxt->dd, uctxt);
1271
1272         memset(&binfo, 0, sizeof(binfo));
1273         binfo.hw_version = dd->revision;
1274         binfo.sw_version = HFI1_KERN_SWVERSION;
1275         binfo.bthqp = kdeth_qp;
1276         binfo.jkey = uctxt->jkey;
1277         /*
1278          * If more than 64 contexts are enabled the allocated credit
1279          * return will span two or three contiguous pages. Since we only
1280          * map the page containing the context's credit return address,
1281          * we need to calculate the offset in the proper page.
1282          */
1283         offset = ((u64)uctxt->sc->hw_free -
1284                   (u64)dd->cr_base[uctxt->numa_id].va) % PAGE_SIZE;
1285         binfo.sc_credits_addr = HFI1_MMAP_TOKEN(PIO_CRED, uctxt->ctxt,
1286                                                 fd->subctxt, offset);
1287         binfo.pio_bufbase = HFI1_MMAP_TOKEN(PIO_BUFS, uctxt->ctxt,
1288                                             fd->subctxt,
1289                                             uctxt->sc->base_addr);
1290         binfo.pio_bufbase_sop = HFI1_MMAP_TOKEN(PIO_BUFS_SOP,
1291                                                 uctxt->ctxt,
1292                                                 fd->subctxt,
1293                                                 uctxt->sc->base_addr);
1294         binfo.rcvhdr_bufbase = HFI1_MMAP_TOKEN(RCV_HDRQ, uctxt->ctxt,
1295                                                fd->subctxt,
1296                                                uctxt->rcvhdrq);
1297         binfo.rcvegr_bufbase = HFI1_MMAP_TOKEN(RCV_EGRBUF, uctxt->ctxt,
1298                                                fd->subctxt,
1299                                                uctxt->egrbufs.rcvtids[0].dma);
1300         binfo.sdma_comp_bufbase = HFI1_MMAP_TOKEN(SDMA_COMP, uctxt->ctxt,
1301                                                  fd->subctxt, 0);
1302         /*
1303          * user regs are at
1304          * (RXE_PER_CONTEXT_USER + (ctxt * RXE_PER_CONTEXT_SIZE))
1305          */
1306         binfo.user_regbase = HFI1_MMAP_TOKEN(UREGS, uctxt->ctxt,
1307                                             fd->subctxt, 0);
1308         offset = offset_in_page((((uctxt->ctxt - dd->first_user_ctxt) *
1309                     HFI1_MAX_SHARED_CTXTS) + fd->subctxt) *
1310                   sizeof(*dd->events));
1311         binfo.events_bufbase = HFI1_MMAP_TOKEN(EVENTS, uctxt->ctxt,
1312                                               fd->subctxt,
1313                                               offset);
1314         binfo.status_bufbase = HFI1_MMAP_TOKEN(STATUS, uctxt->ctxt,
1315                                               fd->subctxt,
1316                                               dd->status);
1317         if (HFI1_CAP_IS_USET(DMA_RTAIL))
1318                 binfo.rcvhdrtail_base = HFI1_MMAP_TOKEN(RTAIL, uctxt->ctxt,
1319                                                        fd->subctxt, 0);
1320         if (uctxt->subctxt_cnt) {
1321                 binfo.subctxt_uregbase = HFI1_MMAP_TOKEN(SUBCTXT_UREGS,
1322                                                         uctxt->ctxt,
1323                                                         fd->subctxt, 0);
1324                 binfo.subctxt_rcvhdrbuf = HFI1_MMAP_TOKEN(SUBCTXT_RCV_HDRQ,
1325                                                          uctxt->ctxt,
1326                                                          fd->subctxt, 0);
1327                 binfo.subctxt_rcvegrbuf = HFI1_MMAP_TOKEN(SUBCTXT_EGRBUF,
1328                                                          uctxt->ctxt,
1329                                                          fd->subctxt, 0);
1330         }
1331         sz = (len < sizeof(binfo)) ? len : sizeof(binfo);
1332         if (copy_to_user(ubase, &binfo, sz))
1333                 ret = -EFAULT;
1334         return ret;
1335 }
1336
1337 static unsigned int poll_urgent(struct file *fp,
1338                                 struct poll_table_struct *pt)
1339 {
1340         struct hfi1_filedata *fd = fp->private_data;
1341         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1342         struct hfi1_devdata *dd = uctxt->dd;
1343         unsigned pollflag;
1344
1345         poll_wait(fp, &uctxt->wait, pt);
1346
1347         spin_lock_irq(&dd->uctxt_lock);
1348         if (uctxt->urgent != uctxt->urgent_poll) {
1349                 pollflag = POLLIN | POLLRDNORM;
1350                 uctxt->urgent_poll = uctxt->urgent;
1351         } else {
1352                 pollflag = 0;
1353                 set_bit(HFI1_CTXT_WAITING_URG, &uctxt->event_flags);
1354         }
1355         spin_unlock_irq(&dd->uctxt_lock);
1356
1357         return pollflag;
1358 }
1359
1360 static unsigned int poll_next(struct file *fp,
1361                               struct poll_table_struct *pt)
1362 {
1363         struct hfi1_filedata *fd = fp->private_data;
1364         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1365         struct hfi1_devdata *dd = uctxt->dd;
1366         unsigned pollflag;
1367
1368         poll_wait(fp, &uctxt->wait, pt);
1369
1370         spin_lock_irq(&dd->uctxt_lock);
1371         if (hdrqempty(uctxt)) {
1372                 set_bit(HFI1_CTXT_WAITING_RCV, &uctxt->event_flags);
1373                 hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_ENB, uctxt->ctxt);
1374                 pollflag = 0;
1375         } else {
1376                 pollflag = POLLIN | POLLRDNORM;
1377         }
1378         spin_unlock_irq(&dd->uctxt_lock);
1379
1380         return pollflag;
1381 }
1382
1383 /*
1384  * Find all user contexts in use, and set the specified bit in their
1385  * event mask.
1386  * See also find_ctxt() for a similar use, that is specific to send buffers.
1387  */
1388 int hfi1_set_uevent_bits(struct hfi1_pportdata *ppd, const int evtbit)
1389 {
1390         struct hfi1_ctxtdata *uctxt;
1391         struct hfi1_devdata *dd = ppd->dd;
1392         unsigned ctxt;
1393         int ret = 0;
1394         unsigned long flags;
1395
1396         if (!dd->events) {
1397                 ret = -EINVAL;
1398                 goto done;
1399         }
1400
1401         spin_lock_irqsave(&dd->uctxt_lock, flags);
1402         for (ctxt = dd->first_user_ctxt; ctxt < dd->num_rcv_contexts;
1403              ctxt++) {
1404                 uctxt = dd->rcd[ctxt];
1405                 if (uctxt) {
1406                         unsigned long *evs = dd->events +
1407                                 (uctxt->ctxt - dd->first_user_ctxt) *
1408                                 HFI1_MAX_SHARED_CTXTS;
1409                         int i;
1410                         /*
1411                          * subctxt_cnt is 0 if not shared, so do base
1412                          * separately, first, then remaining subctxt, if any
1413                          */
1414                         set_bit(evtbit, evs);
1415                         for (i = 1; i < uctxt->subctxt_cnt; i++)
1416                                 set_bit(evtbit, evs + i);
1417                 }
1418         }
1419         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1420 done:
1421         return ret;
1422 }
1423
1424 /**
1425  * manage_rcvq - manage a context's receive queue
1426  * @uctxt: the context
1427  * @subctxt: the sub-context
1428  * @start_stop: action to carry out
1429  *
1430  * start_stop == 0 disables receive on the context, for use in queue
1431  * overflow conditions.  start_stop==1 re-enables, to be used to
1432  * re-init the software copy of the head register
1433  */
1434 static int manage_rcvq(struct hfi1_ctxtdata *uctxt, unsigned subctxt,
1435                        int start_stop)
1436 {
1437         struct hfi1_devdata *dd = uctxt->dd;
1438         unsigned int rcvctrl_op;
1439
1440         if (subctxt)
1441                 goto bail;
1442         /* atomically clear receive enable ctxt. */
1443         if (start_stop) {
1444                 /*
1445                  * On enable, force in-memory copy of the tail register to
1446                  * 0, so that protocol code doesn't have to worry about
1447                  * whether or not the chip has yet updated the in-memory
1448                  * copy or not on return from the system call. The chip
1449                  * always resets it's tail register back to 0 on a
1450                  * transition from disabled to enabled.
1451                  */
1452                 if (uctxt->rcvhdrtail_kvaddr)
1453                         clear_rcvhdrtail(uctxt);
1454                 rcvctrl_op = HFI1_RCVCTRL_CTXT_ENB;
1455         } else {
1456                 rcvctrl_op = HFI1_RCVCTRL_CTXT_DIS;
1457         }
1458         hfi1_rcvctrl(dd, rcvctrl_op, uctxt->ctxt);
1459         /* always; new head should be equal to new tail; see above */
1460 bail:
1461         return 0;
1462 }
1463
1464 /*
1465  * clear the event notifier events for this context.
1466  * User process then performs actions appropriate to bit having been
1467  * set, if desired, and checks again in future.
1468  */
1469 static int user_event_ack(struct hfi1_ctxtdata *uctxt, int subctxt,
1470                           unsigned long events)
1471 {
1472         int i;
1473         struct hfi1_devdata *dd = uctxt->dd;
1474         unsigned long *evs;
1475
1476         if (!dd->events)
1477                 return 0;
1478
1479         evs = dd->events + ((uctxt->ctxt - dd->first_user_ctxt) *
1480                             HFI1_MAX_SHARED_CTXTS) + subctxt;
1481
1482         for (i = 0; i <= _HFI1_MAX_EVENT_BIT; i++) {
1483                 if (!test_bit(i, &events))
1484                         continue;
1485                 clear_bit(i, evs);
1486         }
1487         return 0;
1488 }
1489
1490 static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, unsigned subctxt,
1491                          u16 pkey)
1492 {
1493         int ret = -ENOENT, i, intable = 0;
1494         struct hfi1_pportdata *ppd = uctxt->ppd;
1495         struct hfi1_devdata *dd = uctxt->dd;
1496
1497         if (pkey == LIM_MGMT_P_KEY || pkey == FULL_MGMT_P_KEY) {
1498                 ret = -EINVAL;
1499                 goto done;
1500         }
1501
1502         for (i = 0; i < ARRAY_SIZE(ppd->pkeys); i++)
1503                 if (pkey == ppd->pkeys[i]) {
1504                         intable = 1;
1505                         break;
1506                 }
1507
1508         if (intable)
1509                 ret = hfi1_set_ctxt_pkey(dd, uctxt->ctxt, pkey);
1510 done:
1511         return ret;
1512 }
1513
1514 static void user_remove(struct hfi1_devdata *dd)
1515 {
1516
1517         hfi1_cdev_cleanup(&dd->user_cdev, &dd->user_device);
1518 }
1519
1520 static int user_add(struct hfi1_devdata *dd)
1521 {
1522         char name[10];
1523         int ret;
1524
1525         snprintf(name, sizeof(name), "%s_%d", class_name(), dd->unit);
1526         ret = hfi1_cdev_init(dd->unit, name, &hfi1_file_ops,
1527                              &dd->user_cdev, &dd->user_device,
1528                              true, &dd->kobj);
1529         if (ret)
1530                 user_remove(dd);
1531
1532         return ret;
1533 }
1534
1535 /*
1536  * Create per-unit files in /dev
1537  */
1538 int hfi1_device_create(struct hfi1_devdata *dd)
1539 {
1540         return user_add(dd);
1541 }
1542
1543 /*
1544  * Remove per-unit files in /dev
1545  * void, core kernel returns no errors for this stuff
1546  */
1547 void hfi1_device_remove(struct hfi1_devdata *dd)
1548 {
1549         user_remove(dd);
1550 }