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) || !uctxt->rcvhdrtail_kvaddr) {
 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         /* clean up rcv side */
 755         hfi1_user_exp_rcv_free(fdata);
 756
 757         /*
 758          * Clear any left over, unhandled events so the next process that
 759          * gets this context doesn't get confused.
 760          */
 761         ev = dd->events + ((uctxt->ctxt - dd->first_user_ctxt) *
 762                            HFI1_MAX_SHARED_CTXTS) + fdata->subctxt;
 763         *ev = 0;
 764
 765         if (--uctxt->cnt) {
 766                 uctxt->active_slaves &= ~(1 << fdata->subctxt);
 767                 mutex_unlock(&hfi1_mutex);
 768                 goto done;
 769         }
 770
 771         spin_lock_irqsave(&dd->uctxt_lock, flags);
 772         /*
 773          * Disable receive context and interrupt available, reset all
 774          * RcvCtxtCtrl bits to default values.
 775          */
 776         hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_DIS |
 777                      HFI1_RCVCTRL_TIDFLOW_DIS |
 778                      HFI1_RCVCTRL_INTRAVAIL_DIS |
 779                      HFI1_RCVCTRL_TAILUPD_DIS |
 780                      HFI1_RCVCTRL_ONE_PKT_EGR_DIS |
 781                      HFI1_RCVCTRL_NO_RHQ_DROP_DIS |
 782                      HFI1_RCVCTRL_NO_EGR_DROP_DIS, uctxt->ctxt);
 783         /* Clear the context's J_KEY */
 784         hfi1_clear_ctxt_jkey(dd, uctxt->ctxt);
 785         /*
 786          * Reset context integrity checks to default.
 787          * (writes to CSRs probably belong in chip.c)
 788          */
 789         write_kctxt_csr(dd, uctxt->sc->hw_context, SEND_CTXT_CHECK_ENABLE,
 790                         hfi1_pkt_default_send_ctxt_mask(dd, uctxt->sc->type));
 791         sc_disable(uctxt->sc);
 792         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 793
 794         dd->rcd[uctxt->ctxt] = NULL;
 795
 796         hfi1_user_exp_rcv_grp_free(uctxt);
 797         hfi1_clear_ctxt_pkey(dd, uctxt->ctxt);
 798
 799         uctxt->rcvwait_to = 0;
 800         uctxt->piowait_to = 0;
 801         uctxt->rcvnowait = 0;
 802         uctxt->pionowait = 0;
 803         uctxt->event_flags = 0;
 804
 805         hfi1_stats.sps_ctxts--;
 806         if (++dd->freectxts == dd->num_user_contexts)
 807                 aspm_enable_all(dd);
 808         mutex_unlock(&hfi1_mutex);
 809         hfi1_free_ctxtdata(dd, uctxt);
 810 done:
 811         mmdrop(fdata->mm);
 812         kobject_put(&dd->kobj);
 813
 814         if (atomic_dec_and_test(&dd->user_refcount))
 815                 complete(&dd->user_comp);
 816
 817         kfree(fdata);
 818         return 0;
 819 }
 820
 821 /*
 822  * Convert kernel *virtual* addresses to physical addresses.
 823  * This is used to vmalloc'ed addresses.
 824  */
 825 static u64 kvirt_to_phys(void *addr)
 826 {
 827         struct page *page;
 828         u64 paddr = 0;
 829
 830         page = vmalloc_to_page(addr);
 831         if (page)
 832                 paddr = page_to_pfn(page) << PAGE_SHIFT;
 833
 834         return paddr;
 835 }
 836
 837 static int assign_ctxt(struct file *fp, struct hfi1_user_info *uinfo)
 838 {
 839         int i_minor, ret = 0;
 840         unsigned int swmajor, swminor;
 841
 842         swmajor = uinfo->userversion >> 16;
 843         if (swmajor != HFI1_USER_SWMAJOR) {
 844                 ret = -ENODEV;
 845                 goto done;
 846         }
 847
 848         swminor = uinfo->userversion & 0xffff;
 849
 850         mutex_lock(&hfi1_mutex);
 851         /* First, lets check if we need to setup a shared context? */
 852         if (uinfo->subctxt_cnt) {
 853                 struct hfi1_filedata *fd = fp->private_data;
 854
 855                 ret = find_shared_ctxt(fp, uinfo);
 856                 if (ret < 0)
 857                         goto done_unlock;
 858                 if (ret) {
 859                         fd->rec_cpu_num =
 860                                 hfi1_get_proc_affinity(fd->uctxt->numa_id);
 861                 }
 862         }
 863
 864         /*
 865          * We execute the following block if we couldn't find a
 866          * shared context or if context sharing is not required.
 867          */
 868         if (!ret) {
 869                 i_minor = iminor(file_inode(fp)) - HFI1_USER_MINOR_BASE;
 870                 ret = get_user_context(fp, uinfo, i_minor);
 871         }
 872 done_unlock:
 873         mutex_unlock(&hfi1_mutex);
 874 done:
 875         return ret;
 876 }
 877
 878 static int get_user_context(struct file *fp, struct hfi1_user_info *uinfo,
 879                             int devno)
 880 {
 881         struct hfi1_devdata *dd = NULL;
 882         int devmax, npresent, nup;
 883
 884         devmax = hfi1_count_units(&npresent, &nup);
 885         if (!npresent)
 886                 return -ENXIO;
 887
 888         if (!nup)
 889                 return -ENETDOWN;
 890
 891         dd = hfi1_lookup(devno);
 892         if (!dd)
 893                 return -ENODEV;
 894         else if (!dd->freectxts)
 895                 return -EBUSY;
 896
 897         return allocate_ctxt(fp, dd, uinfo);
 898 }
 899
 900 static int find_shared_ctxt(struct file *fp,
 901                             const struct hfi1_user_info *uinfo)
 902 {
 903         int devmax, ndev, i;
 904         int ret = 0;
 905         struct hfi1_filedata *fd = fp->private_data;
 906
 907         devmax = hfi1_count_units(NULL, NULL);
 908
 909         for (ndev = 0; ndev < devmax; ndev++) {
 910                 struct hfi1_devdata *dd = hfi1_lookup(ndev);
 911
 912                 if (!(dd && (dd->flags & HFI1_PRESENT) && dd->kregbase))
 913                         continue;
 914                 for (i = dd->first_user_ctxt; i < dd->num_rcv_contexts; i++) {
 915                         struct hfi1_ctxtdata *uctxt = dd->rcd[i];
 916
 917                         /* Skip ctxts which are not yet open */
 918                         if (!uctxt || !uctxt->cnt)
 919                                 continue;
 920                         /* Skip ctxt if it doesn't match the requested one */
 921                         if (memcmp(uctxt->uuid, uinfo->uuid,
 922                                    sizeof(uctxt->uuid)) ||
 923                             uctxt->jkey != generate_jkey(current_uid()) ||
 924                             uctxt->subctxt_id != uinfo->subctxt_id ||
 925                             uctxt->subctxt_cnt != uinfo->subctxt_cnt)
 926                                 continue;
 927
 928                         /* Verify the sharing process matches the master */
 929                         if (uctxt->userversion != uinfo->userversion ||
 930                             uctxt->cnt >= uctxt->subctxt_cnt) {
 931                                 ret = -EINVAL;
 932                                 goto done;
 933                         }
 934                         fd->uctxt = uctxt;
 935                         fd->subctxt  = uctxt->cnt++;
 936                         uctxt->active_slaves |= 1 << fd->subctxt;
 937                         ret = 1;
 938                         goto done;
 939                 }
 940         }
 941
 942 done:
 943         return ret;
 944 }
 945
 946 static int allocate_ctxt(struct file *fp, struct hfi1_devdata *dd,
 947                          struct hfi1_user_info *uinfo)
 948 {
 949         struct hfi1_filedata *fd = fp->private_data;
 950         struct hfi1_ctxtdata *uctxt;
 951         unsigned ctxt;
 952         int ret, numa;
 953
 954         if (dd->flags & HFI1_FROZEN) {
 955                 /*
 956                  * Pick an error that is unique from all other errors
 957                  * that are returned so the user process knows that
 958                  * it tried to allocate while the SPC was frozen.  It
 959                  * it should be able to retry with success in a short
 960                  * while.
 961                  */
 962                 return -EIO;
 963         }
 964
 965         for (ctxt = dd->first_user_ctxt; ctxt < dd->num_rcv_contexts; ctxt++)
 966                 if (!dd->rcd[ctxt])
 967                         break;
 968
 969         if (ctxt == dd->num_rcv_contexts)
 970                 return -EBUSY;
 971
 972         /*
 973          * If we don't have a NUMA node requested, preference is towards
 974          * device NUMA node.
 975          */
 976         fd->rec_cpu_num = hfi1_get_proc_affinity(dd->node);
 977         if (fd->rec_cpu_num != -1)
 978                 numa = cpu_to_node(fd->rec_cpu_num);
 979         else
 980                 numa = numa_node_id();
 981         uctxt = hfi1_create_ctxtdata(dd->pport, ctxt, numa);
 982         if (!uctxt) {
 983                 dd_dev_err(dd,
 984                            "Unable to allocate ctxtdata memory, failing open\n");
 985                 return -ENOMEM;
 986         }
 987         hfi1_cdbg(PROC, "[%u:%u] pid %u assigned to CPU %d (NUMA %u)",
 988                   uctxt->ctxt, fd->subctxt, current->pid, fd->rec_cpu_num,
 989                   uctxt->numa_id);
 990
 991         /*
 992          * Allocate and enable a PIO send context.
 993          */
 994         uctxt->sc = sc_alloc(dd, SC_USER, uctxt->rcvhdrqentsize,
 995                              uctxt->dd->node);
 996         if (!uctxt->sc) {
 997                 ret = -ENOMEM;
 998                 goto ctxdata_free;
 999         }
1000         hfi1_cdbg(PROC, "allocated send context %u(%u)\n", uctxt->sc->sw_index,
1001                   uctxt->sc->hw_context);
1002         ret = sc_enable(uctxt->sc);
1003         if (ret)
1004                 goto ctxdata_free;
1005
1006         /*
1007          * Setup shared context resources if the user-level has requested
1008          * shared contexts and this is the 'master' process.
1009          * This has to be done here so the rest of the sub-contexts find the
1010          * proper master.
1011          */
1012         if (uinfo->subctxt_cnt && !fd->subctxt) {
1013                 ret = init_subctxts(uctxt, uinfo);
1014                 /*
1015                  * On error, we don't need to disable and de-allocate the
1016                  * send context because it will be done during file close
1017                  */
1018                 if (ret)
1019                         goto ctxdata_free;
1020         }
1021         uctxt->userversion = uinfo->userversion;
1022         uctxt->flags = hfi1_cap_mask; /* save current flag state */
1023         init_waitqueue_head(&uctxt->wait);
1024         strlcpy(uctxt->comm, current->comm, sizeof(uctxt->comm));
1025         memcpy(uctxt->uuid, uinfo->uuid, sizeof(uctxt->uuid));
1026         uctxt->jkey = generate_jkey(current_uid());
1027         INIT_LIST_HEAD(&uctxt->sdma_queues);
1028         spin_lock_init(&uctxt->sdma_qlock);
1029         hfi1_stats.sps_ctxts++;
1030         /*
1031          * Disable ASPM when there are open user/PSM contexts to avoid
1032          * issues with ASPM L1 exit latency
1033          */
1034         if (dd->freectxts-- == dd->num_user_contexts)
1035                 aspm_disable_all(dd);
1036         fd->uctxt = uctxt;
1037
1038         return 0;
1039
1040 ctxdata_free:
1041         dd->rcd[ctxt] = NULL;
1042         hfi1_free_ctxtdata(dd, uctxt);
1043         return ret;
1044 }
1045
1046 static int init_subctxts(struct hfi1_ctxtdata *uctxt,
1047                          const struct hfi1_user_info *uinfo)
1048 {
1049         unsigned num_subctxts;
1050
1051         num_subctxts = uinfo->subctxt_cnt;
1052         if (num_subctxts > HFI1_MAX_SHARED_CTXTS)
1053                 return -EINVAL;
1054
1055         uctxt->subctxt_cnt = uinfo->subctxt_cnt;
1056         uctxt->subctxt_id = uinfo->subctxt_id;
1057         uctxt->active_slaves = 1;
1058         uctxt->redirect_seq_cnt = 1;
1059         set_bit(HFI1_CTXT_MASTER_UNINIT, &uctxt->event_flags);
1060
1061         return 0;
1062 }
1063
1064 static int setup_subctxt(struct hfi1_ctxtdata *uctxt)
1065 {
1066         int ret = 0;
1067         unsigned num_subctxts = uctxt->subctxt_cnt;
1068
1069         uctxt->subctxt_uregbase = vmalloc_user(PAGE_SIZE);
1070         if (!uctxt->subctxt_uregbase) {
1071                 ret = -ENOMEM;
1072                 goto bail;
1073         }
1074         /* We can take the size of the RcvHdr Queue from the master */
1075         uctxt->subctxt_rcvhdr_base = vmalloc_user(uctxt->rcvhdrq_size *
1076                                                   num_subctxts);
1077         if (!uctxt->subctxt_rcvhdr_base) {
1078                 ret = -ENOMEM;
1079                 goto bail_ureg;
1080         }
1081
1082         uctxt->subctxt_rcvegrbuf = vmalloc_user(uctxt->egrbufs.size *
1083                                                 num_subctxts);
1084         if (!uctxt->subctxt_rcvegrbuf) {
1085                 ret = -ENOMEM;
1086                 goto bail_rhdr;
1087         }
1088         goto bail;
1089 bail_rhdr:
1090         vfree(uctxt->subctxt_rcvhdr_base);
1091 bail_ureg:
1092         vfree(uctxt->subctxt_uregbase);
1093         uctxt->subctxt_uregbase = NULL;
1094 bail:
1095         return ret;
1096 }
1097
1098 static int user_init(struct file *fp)
1099 {
1100         unsigned int rcvctrl_ops = 0;
1101         struct hfi1_filedata *fd = fp->private_data;
1102         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1103
1104         /* make sure that the context has already been setup */
1105         if (!test_bit(HFI1_CTXT_SETUP_DONE, &uctxt->event_flags))
1106                 return -EFAULT;
1107
1108         /* initialize poll variables... */
1109         uctxt->urgent = 0;
1110         uctxt->urgent_poll = 0;
1111
1112         /*
1113          * Now enable the ctxt for receive.
1114          * For chips that are set to DMA the tail register to memory
1115          * when they change (and when the update bit transitions from
1116          * 0 to 1.  So for those chips, we turn it off and then back on.
1117          * This will (very briefly) affect any other open ctxts, but the
1118          * duration is very short, and therefore isn't an issue.  We
1119          * explicitly set the in-memory tail copy to 0 beforehand, so we
1120          * don't have to wait to be sure the DMA update has happened
1121          * (chip resets head/tail to 0 on transition to enable).
1122          */
1123         if (uctxt->rcvhdrtail_kvaddr)
1124                 clear_rcvhdrtail(uctxt);
1125
1126         /* Setup J_KEY before enabling the context */
1127         hfi1_set_ctxt_jkey(uctxt->dd, uctxt->ctxt, uctxt->jkey);
1128
1129         rcvctrl_ops = HFI1_RCVCTRL_CTXT_ENB;
1130         if (HFI1_CAP_UGET_MASK(uctxt->flags, HDRSUPP))
1131                 rcvctrl_ops |= HFI1_RCVCTRL_TIDFLOW_ENB;
1132         /*
1133          * Ignore the bit in the flags for now until proper
1134          * support for multiple packet per rcv array entry is
1135          * added.
1136          */
1137         if (!HFI1_CAP_UGET_MASK(uctxt->flags, MULTI_PKT_EGR))
1138                 rcvctrl_ops |= HFI1_RCVCTRL_ONE_PKT_EGR_ENB;
1139         if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_EGR_FULL))
1140                 rcvctrl_ops |= HFI1_RCVCTRL_NO_EGR_DROP_ENB;
1141         if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_RHQ_FULL))
1142                 rcvctrl_ops |= HFI1_RCVCTRL_NO_RHQ_DROP_ENB;
1143         /*
1144          * The RcvCtxtCtrl.TailUpd bit has to be explicitly written.
1145          * We can't rely on the correct value to be set from prior
1146          * uses of the chip or ctxt. Therefore, add the rcvctrl op
1147          * for both cases.
1148          */
1149         if (HFI1_CAP_UGET_MASK(uctxt->flags, DMA_RTAIL))
1150                 rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_ENB;
1151         else
1152                 rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_DIS;
1153         hfi1_rcvctrl(uctxt->dd, rcvctrl_ops, uctxt->ctxt);
1154
1155         /* Notify any waiting slaves */
1156         if (uctxt->subctxt_cnt) {
1157                 clear_bit(HFI1_CTXT_MASTER_UNINIT, &uctxt->event_flags);
1158                 wake_up(&uctxt->wait);
1159         }
1160
1161         return 0;
1162 }
1163
1164 static int get_ctxt_info(struct file *fp, void __user *ubase, __u32 len)
1165 {
1166         struct hfi1_ctxt_info cinfo;
1167         struct hfi1_filedata *fd = fp->private_data;
1168         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1169         int ret = 0;
1170
1171         memset(&cinfo, 0, sizeof(cinfo));
1172         cinfo.runtime_flags = (((uctxt->flags >> HFI1_CAP_MISC_SHIFT) &
1173                                 HFI1_CAP_MISC_MASK) << HFI1_CAP_USER_SHIFT) |
1174                         HFI1_CAP_UGET_MASK(uctxt->flags, MASK) |
1175                         HFI1_CAP_KGET_MASK(uctxt->flags, K2U);
1176         /* adjust flag if this fd is not able to cache */
1177         if (!fd->handler)
1178                 cinfo.runtime_flags |= HFI1_CAP_TID_UNMAP; /* no caching */
1179
1180         cinfo.num_active = hfi1_count_active_units();
1181         cinfo.unit = uctxt->dd->unit;
1182         cinfo.ctxt = uctxt->ctxt;
1183         cinfo.subctxt = fd->subctxt;
1184         cinfo.rcvtids = roundup(uctxt->egrbufs.alloced,
1185                                 uctxt->dd->rcv_entries.group_size) +
1186                 uctxt->expected_count;
1187         cinfo.credits = uctxt->sc->credits;
1188         cinfo.numa_node = uctxt->numa_id;
1189         cinfo.rec_cpu = fd->rec_cpu_num;
1190         cinfo.send_ctxt = uctxt->sc->hw_context;
1191
1192         cinfo.egrtids = uctxt->egrbufs.alloced;
1193         cinfo.rcvhdrq_cnt = uctxt->rcvhdrq_cnt;
1194         cinfo.rcvhdrq_entsize = uctxt->rcvhdrqentsize << 2;
1195         cinfo.sdma_ring_size = fd->cq->nentries;
1196         cinfo.rcvegr_size = uctxt->egrbufs.rcvtid_size;
1197
1198         trace_hfi1_ctxt_info(uctxt->dd, uctxt->ctxt, fd->subctxt, cinfo);
1199         if (copy_to_user(ubase, &cinfo, sizeof(cinfo)))
1200                 ret = -EFAULT;
1201
1202         return ret;
1203 }
1204
1205 static int setup_ctxt(struct file *fp)
1206 {
1207         struct hfi1_filedata *fd = fp->private_data;
1208         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1209         struct hfi1_devdata *dd = uctxt->dd;
1210         int ret = 0;
1211
1212         /*
1213          * Context should be set up only once, including allocation and
1214          * programming of eager buffers. This is done if context sharing
1215          * is not requested or by the master process.
1216          */
1217         if (!uctxt->subctxt_cnt || !fd->subctxt) {
1218                 ret = hfi1_init_ctxt(uctxt->sc);
1219                 if (ret)
1220                         goto done;
1221
1222                 /* Now allocate the RcvHdr queue and eager buffers. */
1223                 ret = hfi1_create_rcvhdrq(dd, uctxt);
1224                 if (ret)
1225                         goto done;
1226                 ret = hfi1_setup_eagerbufs(uctxt);
1227                 if (ret)
1228                         goto done;
1229                 if (uctxt->subctxt_cnt && !fd->subctxt) {
1230                         ret = setup_subctxt(uctxt);
1231                         if (ret)
1232                                 goto done;
1233                 }
1234         } else {
1235                 ret = wait_event_interruptible(uctxt->wait, !test_bit(
1236                                                HFI1_CTXT_MASTER_UNINIT,
1237                                                &uctxt->event_flags));
1238                 if (ret)
1239                         goto done;
1240         }
1241
1242         ret = hfi1_user_sdma_alloc_queues(uctxt, fp);
1243         if (ret)
1244                 goto done;
1245         /*
1246          * Expected receive has to be setup for all processes (including
1247          * shared contexts). However, it has to be done after the master
1248          * context has been fully configured as it depends on the
1249          * eager/expected split of the RcvArray entries.
1250          * Setting it up here ensures that the subcontexts will be waiting
1251          * (due to the above wait_event_interruptible() until the master
1252          * is setup.
1253          */
1254         ret = hfi1_user_exp_rcv_init(fp);
1255         if (ret)
1256                 goto done;
1257
1258         set_bit(HFI1_CTXT_SETUP_DONE, &uctxt->event_flags);
1259 done:
1260         return ret;
1261 }
1262
1263 static int get_base_info(struct file *fp, void __user *ubase, __u32 len)
1264 {
1265         struct hfi1_base_info binfo;
1266         struct hfi1_filedata *fd = fp->private_data;
1267         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1268         struct hfi1_devdata *dd = uctxt->dd;
1269         ssize_t sz;
1270         unsigned offset;
1271         int ret = 0;
1272
1273         trace_hfi1_uctxtdata(uctxt->dd, uctxt);
1274
1275         memset(&binfo, 0, sizeof(binfo));
1276         binfo.hw_version = dd->revision;
1277         binfo.sw_version = HFI1_KERN_SWVERSION;
1278         binfo.bthqp = kdeth_qp;
1279         binfo.jkey = uctxt->jkey;
1280         /*
1281          * If more than 64 contexts are enabled the allocated credit
1282          * return will span two or three contiguous pages. Since we only
1283          * map the page containing the context's credit return address,
1284          * we need to calculate the offset in the proper page.
1285          */
1286         offset = ((u64)uctxt->sc->hw_free -
1287                   (u64)dd->cr_base[uctxt->numa_id].va) % PAGE_SIZE;
1288         binfo.sc_credits_addr = HFI1_MMAP_TOKEN(PIO_CRED, uctxt->ctxt,
1289                                                 fd->subctxt, offset);
1290         binfo.pio_bufbase = HFI1_MMAP_TOKEN(PIO_BUFS, uctxt->ctxt,
1291                                             fd->subctxt,
1292                                             uctxt->sc->base_addr);
1293         binfo.pio_bufbase_sop = HFI1_MMAP_TOKEN(PIO_BUFS_SOP,
1294                                                 uctxt->ctxt,
1295                                                 fd->subctxt,
1296                                                 uctxt->sc->base_addr);
1297         binfo.rcvhdr_bufbase = HFI1_MMAP_TOKEN(RCV_HDRQ, uctxt->ctxt,
1298                                                fd->subctxt,
1299                                                uctxt->rcvhdrq);
1300         binfo.rcvegr_bufbase = HFI1_MMAP_TOKEN(RCV_EGRBUF, uctxt->ctxt,
1301                                                fd->subctxt,
1302                                                uctxt->egrbufs.rcvtids[0].dma);
1303         binfo.sdma_comp_bufbase = HFI1_MMAP_TOKEN(SDMA_COMP, uctxt->ctxt,
1304                                                  fd->subctxt, 0);
1305         /*
1306          * user regs are at
1307          * (RXE_PER_CONTEXT_USER + (ctxt * RXE_PER_CONTEXT_SIZE))
1308          */
1309         binfo.user_regbase = HFI1_MMAP_TOKEN(UREGS, uctxt->ctxt,
1310                                             fd->subctxt, 0);
1311         offset = offset_in_page((((uctxt->ctxt - dd->first_user_ctxt) *
1312                     HFI1_MAX_SHARED_CTXTS) + fd->subctxt) *
1313                   sizeof(*dd->events));
1314         binfo.events_bufbase = HFI1_MMAP_TOKEN(EVENTS, uctxt->ctxt,
1315                                               fd->subctxt,
1316                                               offset);
1317         binfo.status_bufbase = HFI1_MMAP_TOKEN(STATUS, uctxt->ctxt,
1318                                               fd->subctxt,
1319                                               dd->status);
1320         if (HFI1_CAP_IS_USET(DMA_RTAIL))
1321                 binfo.rcvhdrtail_base = HFI1_MMAP_TOKEN(RTAIL, uctxt->ctxt,
1322                                                        fd->subctxt, 0);
1323         if (uctxt->subctxt_cnt) {
1324                 binfo.subctxt_uregbase = HFI1_MMAP_TOKEN(SUBCTXT_UREGS,
1325                                                         uctxt->ctxt,
1326                                                         fd->subctxt, 0);
1327                 binfo.subctxt_rcvhdrbuf = HFI1_MMAP_TOKEN(SUBCTXT_RCV_HDRQ,
1328                                                          uctxt->ctxt,
1329                                                          fd->subctxt, 0);
1330                 binfo.subctxt_rcvegrbuf = HFI1_MMAP_TOKEN(SUBCTXT_EGRBUF,
1331                                                          uctxt->ctxt,
1332                                                          fd->subctxt, 0);
1333         }
1334         sz = (len < sizeof(binfo)) ? len : sizeof(binfo);
1335         if (copy_to_user(ubase, &binfo, sz))
1336                 ret = -EFAULT;
1337         return ret;
1338 }
1339
1340 static unsigned int poll_urgent(struct file *fp,
1341                                 struct poll_table_struct *pt)
1342 {
1343         struct hfi1_filedata *fd = fp->private_data;
1344         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1345         struct hfi1_devdata *dd = uctxt->dd;
1346         unsigned pollflag;
1347
1348         poll_wait(fp, &uctxt->wait, pt);
1349
1350         spin_lock_irq(&dd->uctxt_lock);
1351         if (uctxt->urgent != uctxt->urgent_poll) {
1352                 pollflag = POLLIN | POLLRDNORM;
1353                 uctxt->urgent_poll = uctxt->urgent;
1354         } else {
1355                 pollflag = 0;
1356                 set_bit(HFI1_CTXT_WAITING_URG, &uctxt->event_flags);
1357         }
1358         spin_unlock_irq(&dd->uctxt_lock);
1359
1360         return pollflag;
1361 }
1362
1363 static unsigned int poll_next(struct file *fp,
1364                               struct poll_table_struct *pt)
1365 {
1366         struct hfi1_filedata *fd = fp->private_data;
1367         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1368         struct hfi1_devdata *dd = uctxt->dd;
1369         unsigned pollflag;
1370
1371         poll_wait(fp, &uctxt->wait, pt);
1372
1373         spin_lock_irq(&dd->uctxt_lock);
1374         if (hdrqempty(uctxt)) {
1375                 set_bit(HFI1_CTXT_WAITING_RCV, &uctxt->event_flags);
1376                 hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_ENB, uctxt->ctxt);
1377                 pollflag = 0;
1378         } else {
1379                 pollflag = POLLIN | POLLRDNORM;
1380         }
1381         spin_unlock_irq(&dd->uctxt_lock);
1382
1383         return pollflag;
1384 }
1385
1386 /*
1387  * Find all user contexts in use, and set the specified bit in their
1388  * event mask.
1389  * See also find_ctxt() for a similar use, that is specific to send buffers.
1390  */
1391 int hfi1_set_uevent_bits(struct hfi1_pportdata *ppd, const int evtbit)
1392 {
1393         struct hfi1_ctxtdata *uctxt;
1394         struct hfi1_devdata *dd = ppd->dd;
1395         unsigned ctxt;
1396         int ret = 0;
1397         unsigned long flags;
1398
1399         if (!dd->events) {
1400                 ret = -EINVAL;
1401                 goto done;
1402         }
1403
1404         spin_lock_irqsave(&dd->uctxt_lock, flags);
1405         for (ctxt = dd->first_user_ctxt; ctxt < dd->num_rcv_contexts;
1406              ctxt++) {
1407                 uctxt = dd->rcd[ctxt];
1408                 if (uctxt) {
1409                         unsigned long *evs = dd->events +
1410                                 (uctxt->ctxt - dd->first_user_ctxt) *
1411                                 HFI1_MAX_SHARED_CTXTS;
1412                         int i;
1413                         /*
1414                          * subctxt_cnt is 0 if not shared, so do base
1415                          * separately, first, then remaining subctxt, if any
1416                          */
1417                         set_bit(evtbit, evs);
1418                         for (i = 1; i < uctxt->subctxt_cnt; i++)
1419                                 set_bit(evtbit, evs + i);
1420                 }
1421         }
1422         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1423 done:
1424         return ret;
1425 }
1426
1427 /**
1428  * manage_rcvq - manage a context's receive queue
1429  * @uctxt: the context
1430  * @subctxt: the sub-context
1431  * @start_stop: action to carry out
1432  *
1433  * start_stop == 0 disables receive on the context, for use in queue
1434  * overflow conditions.  start_stop==1 re-enables, to be used to
1435  * re-init the software copy of the head register
1436  */
1437 static int manage_rcvq(struct hfi1_ctxtdata *uctxt, unsigned subctxt,
1438                        int start_stop)
1439 {
1440         struct hfi1_devdata *dd = uctxt->dd;
1441         unsigned int rcvctrl_op;
1442
1443         if (subctxt)
1444                 goto bail;
1445         /* atomically clear receive enable ctxt. */
1446         if (start_stop) {
1447                 /*
1448                  * On enable, force in-memory copy of the tail register to
1449                  * 0, so that protocol code doesn't have to worry about
1450                  * whether or not the chip has yet updated the in-memory
1451                  * copy or not on return from the system call. The chip
1452                  * always resets it's tail register back to 0 on a
1453                  * transition from disabled to enabled.
1454                  */
1455                 if (uctxt->rcvhdrtail_kvaddr)
1456                         clear_rcvhdrtail(uctxt);
1457                 rcvctrl_op = HFI1_RCVCTRL_CTXT_ENB;
1458         } else {
1459                 rcvctrl_op = HFI1_RCVCTRL_CTXT_DIS;
1460         }
1461         hfi1_rcvctrl(dd, rcvctrl_op, uctxt->ctxt);
1462         /* always; new head should be equal to new tail; see above */
1463 bail:
1464         return 0;
1465 }
1466
1467 /*
1468  * clear the event notifier events for this context.
1469  * User process then performs actions appropriate to bit having been
1470  * set, if desired, and checks again in future.
1471  */
1472 static int user_event_ack(struct hfi1_ctxtdata *uctxt, int subctxt,
1473                           unsigned long events)
1474 {
1475         int i;
1476         struct hfi1_devdata *dd = uctxt->dd;
1477         unsigned long *evs;
1478
1479         if (!dd->events)
1480                 return 0;
1481
1482         evs = dd->events + ((uctxt->ctxt - dd->first_user_ctxt) *
1483                             HFI1_MAX_SHARED_CTXTS) + subctxt;
1484
1485         for (i = 0; i <= _HFI1_MAX_EVENT_BIT; i++) {
1486                 if (!test_bit(i, &events))
1487                         continue;
1488                 clear_bit(i, evs);
1489         }
1490         return 0;
1491 }
1492
1493 static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, unsigned subctxt,
1494                          u16 pkey)
1495 {
1496         int ret = -ENOENT, i, intable = 0;
1497         struct hfi1_pportdata *ppd = uctxt->ppd;
1498         struct hfi1_devdata *dd = uctxt->dd;
1499
1500         if (pkey == LIM_MGMT_P_KEY || pkey == FULL_MGMT_P_KEY) {
1501                 ret = -EINVAL;
1502                 goto done;
1503         }
1504
1505         for (i = 0; i < ARRAY_SIZE(ppd->pkeys); i++)
1506                 if (pkey == ppd->pkeys[i]) {
1507                         intable = 1;
1508                         break;
1509                 }
1510
1511         if (intable)
1512                 ret = hfi1_set_ctxt_pkey(dd, uctxt->ctxt, pkey);
1513 done:
1514         return ret;
1515 }
1516
1517 static void user_remove(struct hfi1_devdata *dd)
1518 {
1519
1520         hfi1_cdev_cleanup(&dd->user_cdev, &dd->user_device);
1521 }
1522
1523 static int user_add(struct hfi1_devdata *dd)
1524 {
1525         char name[10];
1526         int ret;
1527
1528         snprintf(name, sizeof(name), "%s_%d", class_name(), dd->unit);
1529         ret = hfi1_cdev_init(dd->unit, name, &hfi1_file_ops,
1530                              &dd->user_cdev, &dd->user_device,
1531                              true, &dd->kobj);
1532         if (ret)
1533                 user_remove(dd);
1534
1535         return ret;
1536 }
1537
1538 /*
1539  * Create per-unit files in /dev
1540  */
1541 int hfi1_device_create(struct hfi1_devdata *dd)
1542 {
1543         return user_add(dd);
1544 }
1545
1546 /*
1547  * Remove per-unit files in /dev
1548  * void, core kernel returns no errors for this stuff
1549  */
1550 void hfi1_device_remove(struct hfi1_devdata *dd)
1551 {
1552         user_remove(dd);
1553 }