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 #include <linux/sched/mm.h>
  52
  53 #include <rdma/ib.h>
  54
  55 #include "hfi.h"
  56 #include "pio.h"
  57 #include "device.h"
  58 #include "common.h"
  59 #include "trace.h"
  60 #include "user_sdma.h"
  61 #include "user_exp_rcv.h"
  62 #include "aspm.h"
  63 #include "mmu_rb.h"
  64
  65 #undef pr_fmt
  66 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
  67
  68 #define SEND_CTXT_HALT_TIMEOUT 1000 /* msecs */
  69
  70 /*
  71  * File operation functions
  72  */
  73 static int hfi1_file_open(struct inode *, struct file *);
  74 static int hfi1_file_close(struct inode *, struct file *);
  75 static ssize_t hfi1_write_iter(struct kiocb *, struct iov_iter *);
  76 static unsigned int hfi1_poll(struct file *, struct poll_table_struct *);
  77 static int hfi1_file_mmap(struct file *, struct vm_area_struct *);
  78
  79 static u64 kvirt_to_phys(void *);
  80 static int assign_ctxt(struct file *, struct hfi1_user_info *);
  81 static int init_subctxts(struct hfi1_ctxtdata *, const struct hfi1_user_info *);
  82 static int user_init(struct file *);
  83 static int get_ctxt_info(struct file *, void __user *, __u32);
  84 static int get_base_info(struct file *, void __user *, __u32);
  85 static int setup_ctxt(struct file *);
  86 static int setup_subctxt(struct hfi1_ctxtdata *);
  87 static int get_user_context(struct file *, struct hfi1_user_info *, int);
  88 static int find_shared_ctxt(struct file *, const struct hfi1_user_info *);
  89 static int allocate_ctxt(struct file *, struct hfi1_devdata *,
  90                          struct hfi1_user_info *);
  91 static unsigned int poll_urgent(struct file *, struct poll_table_struct *);
  92 static unsigned int poll_next(struct file *, struct poll_table_struct *);
  93 static int user_event_ack(struct hfi1_ctxtdata *, int, unsigned long);
  94 static int set_ctxt_pkey(struct hfi1_ctxtdata *, unsigned, u16);
  95 static int manage_rcvq(struct hfi1_ctxtdata *, unsigned, int);
  96 static int vma_fault(struct vm_fault *);
  97 static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
  98                             unsigned long arg);
  99
 100 static const struct file_operations hfi1_file_ops = {
 101         .owner = THIS_MODULE,
 102         .write_iter = hfi1_write_iter,
 103         .open = hfi1_file_open,
 104         .release = hfi1_file_close,
 105         .unlocked_ioctl = hfi1_file_ioctl,
 106         .poll = hfi1_poll,
 107         .mmap = hfi1_file_mmap,
 108         .llseek = noop_llseek,
 109 };
 110
 111 static struct vm_operations_struct vm_ops = {
 112         .fault = vma_fault,
 113 };
 114
 115 /*
 116  * Types of memories mapped into user processes' space
 117  */
 118 enum mmap_types {
 119         PIO_BUFS = 1,
 120         PIO_BUFS_SOP,
 121         PIO_CRED,
 122         RCV_HDRQ,
 123         RCV_EGRBUF,
 124         UREGS,
 125         EVENTS,
 126         STATUS,
 127         RTAIL,
 128         SUBCTXT_UREGS,
 129         SUBCTXT_RCV_HDRQ,
 130         SUBCTXT_EGRBUF,
 131         SDMA_COMP
 132 };
 133
 134 /*
 135  * Masks and offsets defining the mmap tokens
 136  */
 137 #define HFI1_MMAP_OFFSET_MASK   0xfffULL
 138 #define HFI1_MMAP_OFFSET_SHIFT  0
 139 #define HFI1_MMAP_SUBCTXT_MASK  0xfULL
 140 #define HFI1_MMAP_SUBCTXT_SHIFT 12
 141 #define HFI1_MMAP_CTXT_MASK     0xffULL
 142 #define HFI1_MMAP_CTXT_SHIFT    16
 143 #define HFI1_MMAP_TYPE_MASK     0xfULL
 144 #define HFI1_MMAP_TYPE_SHIFT    24
 145 #define HFI1_MMAP_MAGIC_MASK    0xffffffffULL
 146 #define HFI1_MMAP_MAGIC_SHIFT   32
 147
 148 #define HFI1_MMAP_MAGIC         0xdabbad00
 149
 150 #define HFI1_MMAP_TOKEN_SET(field, val) \
 151         (((val) & HFI1_MMAP_##field##_MASK) << HFI1_MMAP_##field##_SHIFT)
 152 #define HFI1_MMAP_TOKEN_GET(field, token) \
 153         (((token) >> HFI1_MMAP_##field##_SHIFT) & HFI1_MMAP_##field##_MASK)
 154 #define HFI1_MMAP_TOKEN(type, ctxt, subctxt, addr)   \
 155         (HFI1_MMAP_TOKEN_SET(MAGIC, HFI1_MMAP_MAGIC) | \
 156         HFI1_MMAP_TOKEN_SET(TYPE, type) | \
 157         HFI1_MMAP_TOKEN_SET(CTXT, ctxt) | \
 158         HFI1_MMAP_TOKEN_SET(SUBCTXT, subctxt) | \
 159         HFI1_MMAP_TOKEN_SET(OFFSET, (offset_in_page(addr))))
 160
 161 #define dbg(fmt, ...)                           \
 162         pr_info(fmt, ##__VA_ARGS__)
 163
 164 static inline int is_valid_mmap(u64 token)
 165 {
 166         return (HFI1_MMAP_TOKEN_GET(MAGIC, token) == HFI1_MMAP_MAGIC);
 167 }
 168
 169 static int hfi1_file_open(struct inode *inode, struct file *fp)
 170 {
 171         struct hfi1_filedata *fd;
 172         struct hfi1_devdata *dd = container_of(inode->i_cdev,
 173                                                struct hfi1_devdata,
 174                                                user_cdev);
 175
 176         if (!atomic_inc_not_zero(&dd->user_refcount))
 177                 return -ENXIO;
 178
 179         /* Just take a ref now. Not all opens result in a context assign */
 180         kobject_get(&dd->kobj);
 181
 182         /* The real work is performed later in assign_ctxt() */
 183
 184         fd = kzalloc(sizeof(*fd), GFP_KERNEL);
 185
 186         if (fd) {
 187                 fd->rec_cpu_num = -1; /* no cpu affinity by default */
 188                 fd->mm = current->mm;
 189                 mmgrab(fd->mm);
 190                 fp->private_data = fd;
 191         } else {
 192                 fp->private_data = NULL;
 193
 194                 if (atomic_dec_and_test(&dd->user_refcount))
 195                         complete(&dd->user_comp);
 196
 197                 return -ENOMEM;
 198         }
 199
 200         return 0;
 201 }
 202
 203 static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
 204                             unsigned long arg)
 205 {
 206         struct hfi1_filedata *fd = fp->private_data;
 207         struct hfi1_ctxtdata *uctxt = fd->uctxt;
 208         struct hfi1_user_info uinfo;
 209         struct hfi1_tid_info tinfo;
 210         int ret = 0;
 211         unsigned long addr;
 212         int uval = 0;
 213         unsigned long ul_uval = 0;
 214         u16 uval16 = 0;
 215
 216         hfi1_cdbg(IOCTL, "IOCTL recv: 0x%x", cmd);
 217         if (cmd != HFI1_IOCTL_ASSIGN_CTXT &&
 218             cmd != HFI1_IOCTL_GET_VERS &&
 219             !uctxt)
 220                 return -EINVAL;
 221
 222         switch (cmd) {
 223         case HFI1_IOCTL_ASSIGN_CTXT:
 224                 if (uctxt)
 225                         return -EINVAL;
 226
 227                 if (copy_from_user(&uinfo,
 228                                    (struct hfi1_user_info __user *)arg,
 229                                    sizeof(uinfo)))
 230                         return -EFAULT;
 231
 232                 ret = assign_ctxt(fp, &uinfo);
 233                 if (ret < 0)
 234                         return ret;
 235                 ret = setup_ctxt(fp);
 236                 if (ret)
 237                         return ret;
 238                 ret = user_init(fp);
 239                 break;
 240         case HFI1_IOCTL_CTXT_INFO:
 241                 ret = get_ctxt_info(fp, (void __user *)(unsigned long)arg,
 242                                     sizeof(struct hfi1_ctxt_info));
 243                 break;
 244         case HFI1_IOCTL_USER_INFO:
 245                 ret = get_base_info(fp, (void __user *)(unsigned long)arg,
 246                                     sizeof(struct hfi1_base_info));
 247                 break;
 248         case HFI1_IOCTL_CREDIT_UPD:
 249                 if (uctxt)
 250                         sc_return_credits(uctxt->sc);
 251                 break;
 252
 253         case HFI1_IOCTL_TID_UPDATE:
 254                 if (copy_from_user(&tinfo,
 255                                    (struct hfi11_tid_info __user *)arg,
 256                                    sizeof(tinfo)))
 257                         return -EFAULT;
 258
 259                 ret = hfi1_user_exp_rcv_setup(fp, &tinfo);
 260                 if (!ret) {
 261                         /*
 262                          * Copy the number of tidlist entries we used
 263                          * and the length of the buffer we registered.
 264                          * These fields are adjacent in the structure so
 265                          * we can copy them at the same time.
 266                          */
 267                         addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
 268                         if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
 269                                          sizeof(tinfo.tidcnt) +
 270                                          sizeof(tinfo.length)))
 271                                 ret = -EFAULT;
 272                 }
 273                 break;
 274
 275         case HFI1_IOCTL_TID_FREE:
 276                 if (copy_from_user(&tinfo,
 277                                    (struct hfi11_tid_info __user *)arg,
 278                                    sizeof(tinfo)))
 279                         return -EFAULT;
 280
 281                 ret = hfi1_user_exp_rcv_clear(fp, &tinfo);
 282                 if (ret)
 283                         break;
 284                 addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
 285                 if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
 286                                  sizeof(tinfo.tidcnt)))
 287                         ret = -EFAULT;
 288                 break;
 289
 290         case HFI1_IOCTL_TID_INVAL_READ:
 291                 if (copy_from_user(&tinfo,
 292                                    (struct hfi11_tid_info __user *)arg,
 293                                    sizeof(tinfo)))
 294                         return -EFAULT;
 295
 296                 ret = hfi1_user_exp_rcv_invalid(fp, &tinfo);
 297                 if (ret)
 298                         break;
 299                 addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
 300                 if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
 301                                  sizeof(tinfo.tidcnt)))
 302                         ret = -EFAULT;
 303                 break;
 304
 305         case HFI1_IOCTL_RECV_CTRL:
 306                 ret = get_user(uval, (int __user *)arg);
 307                 if (ret != 0)
 308                         return -EFAULT;
 309                 ret = manage_rcvq(uctxt, fd->subctxt, uval);
 310                 break;
 311
 312         case HFI1_IOCTL_POLL_TYPE:
 313                 ret = get_user(uval, (int __user *)arg);
 314                 if (ret != 0)
 315                         return -EFAULT;
 316                 uctxt->poll_type = (typeof(uctxt->poll_type))uval;
 317                 break;
 318
 319         case HFI1_IOCTL_ACK_EVENT:
 320                 ret = get_user(ul_uval, (unsigned long __user *)arg);
 321                 if (ret != 0)
 322                         return -EFAULT;
 323                 ret = user_event_ack(uctxt, fd->subctxt, ul_uval);
 324                 break;
 325
 326         case HFI1_IOCTL_SET_PKEY:
 327                 ret = get_user(uval16, (u16 __user *)arg);
 328                 if (ret != 0)
 329                         return -EFAULT;
 330                 if (HFI1_CAP_IS_USET(PKEY_CHECK))
 331                         ret = set_ctxt_pkey(uctxt, fd->subctxt, uval16);
 332                 else
 333                         return -EPERM;
 334                 break;
 335
 336         case HFI1_IOCTL_CTXT_RESET: {
 337                 struct send_context *sc;
 338                 struct hfi1_devdata *dd;
 339
 340                 if (!uctxt || !uctxt->dd || !uctxt->sc)
 341                         return -EINVAL;
 342
 343                 /*
 344                  * There is no protection here. User level has to
 345                  * guarantee that no one will be writing to the send
 346                  * context while it is being re-initialized.
 347                  * If user level breaks that guarantee, it will break
 348                  * it's own context and no one else's.
 349                  */
 350                 dd = uctxt->dd;
 351                 sc = uctxt->sc;
 352                 /*
 353                  * Wait until the interrupt handler has marked the
 354                  * context as halted or frozen. Report error if we time
 355                  * out.
 356                  */
 357                 wait_event_interruptible_timeout(
 358                         sc->halt_wait, (sc->flags & SCF_HALTED),
 359                         msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
 360                 if (!(sc->flags & SCF_HALTED))
 361                         return -ENOLCK;
 362
 363                 /*
 364                  * If the send context was halted due to a Freeze,
 365                  * wait until the device has been "unfrozen" before
 366                  * resetting the context.
 367                  */
 368                 if (sc->flags & SCF_FROZEN) {
 369                         wait_event_interruptible_timeout(
 370                                 dd->event_queue,
 371                                 !(ACCESS_ONCE(dd->flags) & HFI1_FROZEN),
 372                                 msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
 373                         if (dd->flags & HFI1_FROZEN)
 374                                 return -ENOLCK;
 375
 376                         if (dd->flags & HFI1_FORCED_FREEZE)
 377                                 /*
 378                                  * Don't allow context reset if we are into
 379                                  * forced freeze
 380                                  */
 381                                 return -ENODEV;
 382
 383                         sc_disable(sc);
 384                         ret = sc_enable(sc);
 385                         hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_ENB,
 386                                      uctxt->ctxt);
 387                 } else {
 388                         ret = sc_restart(sc);
 389                 }
 390                 if (!ret)
 391                         sc_return_credits(sc);
 392                 break;
 393         }
 394
 395         case HFI1_IOCTL_GET_VERS:
 396                 uval = HFI1_USER_SWVERSION;
 397                 if (put_user(uval, (int __user *)arg))
 398                         return -EFAULT;
 399                 break;
 400
 401         default:
 402                 return -EINVAL;
 403         }
 404
 405         return ret;
 406 }
 407
 408 static ssize_t hfi1_write_iter(struct kiocb *kiocb, struct iov_iter *from)
 409 {
 410         struct hfi1_filedata *fd = kiocb->ki_filp->private_data;
 411         struct hfi1_user_sdma_pkt_q *pq = fd->pq;
 412         struct hfi1_user_sdma_comp_q *cq = fd->cq;
 413         int done = 0, reqs = 0;
 414         unsigned long dim = from->nr_segs;
 415
 416         if (!cq || !pq)
 417                 return -EIO;
 418
 419         if (!iter_is_iovec(from) || !dim)
 420                 return -EINVAL;
 421
 422         hfi1_cdbg(SDMA, "SDMA request from %u:%u (%lu)",
 423                   fd->uctxt->ctxt, fd->subctxt, dim);
 424
 425         if (atomic_read(&pq->n_reqs) == pq->n_max_reqs)
 426                 return -ENOSPC;
 427
 428         while (dim) {
 429                 int ret;
 430                 unsigned long count = 0;
 431
 432                 ret = hfi1_user_sdma_process_request(
 433                         kiocb->ki_filp, (struct iovec *)(from->iov + done),
 434                         dim, &count);
 435                 if (ret) {
 436                         reqs = ret;
 437                         break;
 438                 }
 439                 dim -= count;
 440                 done += count;
 441                 reqs++;
 442         }
 443
 444         return reqs;
 445 }
 446
 447 static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
 448 {
 449         struct hfi1_filedata *fd = fp->private_data;
 450         struct hfi1_ctxtdata *uctxt = fd->uctxt;
 451         struct hfi1_devdata *dd;
 452         unsigned long flags;
 453         u64 token = vma->vm_pgoff << PAGE_SHIFT,
 454                 memaddr = 0;
 455         void *memvirt = NULL;
 456         u8 subctxt, mapio = 0, vmf = 0, type;
 457         ssize_t memlen = 0;
 458         int ret = 0;
 459         u16 ctxt;
 460
 461         if (!is_valid_mmap(token) || !uctxt ||
 462             !(vma->vm_flags & VM_SHARED)) {
 463                 ret = -EINVAL;
 464                 goto done;
 465         }
 466         dd = uctxt->dd;
 467         ctxt = HFI1_MMAP_TOKEN_GET(CTXT, token);
 468         subctxt = HFI1_MMAP_TOKEN_GET(SUBCTXT, token);
 469         type = HFI1_MMAP_TOKEN_GET(TYPE, token);
 470         if (ctxt != uctxt->ctxt || subctxt != fd->subctxt) {
 471                 ret = -EINVAL;
 472                 goto done;
 473         }
 474
 475         flags = vma->vm_flags;
 476
 477         switch (type) {
 478         case PIO_BUFS:
 479         case PIO_BUFS_SOP:
 480                 memaddr = ((dd->physaddr + TXE_PIO_SEND) +
 481                                 /* chip pio base */
 482                            (uctxt->sc->hw_context * BIT(16))) +
 483                                 /* 64K PIO space / ctxt */
 484                         (type == PIO_BUFS_SOP ?
 485                                 (TXE_PIO_SIZE / 2) : 0); /* sop? */
 486                 /*
 487                  * Map only the amount allocated to the context, not the
 488                  * entire available context's PIO space.
 489                  */
 490                 memlen = PAGE_ALIGN(uctxt->sc->credits * PIO_BLOCK_SIZE);
 491                 flags &= ~VM_MAYREAD;
 492                 flags |= VM_DONTCOPY | VM_DONTEXPAND;
 493                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 494                 mapio = 1;
 495                 break;
 496         case PIO_CRED:
 497                 if (flags & VM_WRITE) {
 498                         ret = -EPERM;
 499                         goto done;
 500                 }
 501                 /*
 502                  * The credit return location for this context could be on the
 503                  * second or third page allocated for credit returns (if number
 504                  * of enabled contexts > 64 and 128 respectively).
 505                  */
 506                 memvirt = dd->cr_base[uctxt->numa_id].va;
 507                 memaddr = virt_to_phys(memvirt) +
 508                         (((u64)uctxt->sc->hw_free -
 509                           (u64)dd->cr_base[uctxt->numa_id].va) & PAGE_MASK);
 510                 memlen = PAGE_SIZE;
 511                 flags &= ~VM_MAYWRITE;
 512                 flags |= VM_DONTCOPY | VM_DONTEXPAND;
 513                 /*
 514                  * The driver has already allocated memory for credit
 515                  * returns and programmed it into the chip. Has that
 516                  * memory been flagged as non-cached?
 517                  */
 518                 /* vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); */
 519                 mapio = 1;
 520                 break;
 521         case RCV_HDRQ:
 522                 memlen = uctxt->rcvhdrq_size;
 523                 memvirt = uctxt->rcvhdrq;
 524                 break;
 525         case RCV_EGRBUF: {
 526                 unsigned long addr;
 527                 int i;
 528                 /*
 529                  * The RcvEgr buffer need to be handled differently
 530                  * as multiple non-contiguous pages need to be mapped
 531                  * into the user process.
 532                  */
 533                 memlen = uctxt->egrbufs.size;
 534                 if ((vma->vm_end - vma->vm_start) != memlen) {
 535                         dd_dev_err(dd, "Eager buffer map size invalid (%lu != %lu)\n",
 536                                    (vma->vm_end - vma->vm_start), memlen);
 537                         ret = -EINVAL;
 538                         goto done;
 539                 }
 540                 if (vma->vm_flags & VM_WRITE) {
 541                         ret = -EPERM;
 542                         goto done;
 543                 }
 544                 vma->vm_flags &= ~VM_MAYWRITE;
 545                 addr = vma->vm_start;
 546                 for (i = 0 ; i < uctxt->egrbufs.numbufs; i++) {
 547                         memlen = uctxt->egrbufs.buffers[i].len;
 548                         memvirt = uctxt->egrbufs.buffers[i].addr;
 549                         ret = remap_pfn_range(
 550                                 vma, addr,
 551                                 /*
 552                                  * virt_to_pfn() does the same, but
 553                                  * it's not available on x86_64
 554                                  * when CONFIG_MMU is enabled.
 555                                  */
 556                                 PFN_DOWN(__pa(memvirt)),
 557                                 memlen,
 558                                 vma->vm_page_prot);
 559                         if (ret < 0)
 560                                 goto done;
 561                         addr += memlen;
 562                 }
 563                 ret = 0;
 564                 goto done;
 565         }
 566         case UREGS:
 567                 /*
 568                  * Map only the page that contains this context's user
 569                  * registers.
 570                  */
 571                 memaddr = (unsigned long)
 572                         (dd->physaddr + RXE_PER_CONTEXT_USER)
 573                         + (uctxt->ctxt * RXE_PER_CONTEXT_SIZE);
 574                 /*
 575                  * TidFlow table is on the same page as the rest of the
 576                  * user registers.
 577                  */
 578                 memlen = PAGE_SIZE;
 579                 flags |= VM_DONTCOPY | VM_DONTEXPAND;
 580                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 581                 mapio = 1;
 582                 break;
 583         case EVENTS:
 584                 /*
 585                  * Use the page where this context's flags are. User level
 586                  * knows where it's own bitmap is within the page.
 587                  */
 588                 memaddr = (unsigned long)(dd->events +
 589                                           ((uctxt->ctxt - dd->first_user_ctxt) *
 590                                            HFI1_MAX_SHARED_CTXTS)) & PAGE_MASK;
 591                 memlen = PAGE_SIZE;
 592                 /*
 593                  * v3.7 removes VM_RESERVED but the effect is kept by
 594                  * using VM_IO.
 595                  */
 596                 flags |= VM_IO | VM_DONTEXPAND;
 597                 vmf = 1;
 598                 break;
 599         case STATUS:
 600                 memaddr = kvirt_to_phys((void *)dd->status);
 601                 memlen = PAGE_SIZE;
 602                 flags |= VM_IO | VM_DONTEXPAND;
 603                 break;
 604         case RTAIL:
 605                 if (!HFI1_CAP_IS_USET(DMA_RTAIL)) {
 606                         /*
 607                          * If the memory allocation failed, the context alloc
 608                          * also would have failed, so we would never get here
 609                          */
 610                         ret = -EINVAL;
 611                         goto done;
 612                 }
 613                 if (flags & VM_WRITE) {
 614                         ret = -EPERM;
 615                         goto done;
 616                 }
 617                 memlen = PAGE_SIZE;
 618                 memvirt = (void *)uctxt->rcvhdrtail_kvaddr;
 619                 flags &= ~VM_MAYWRITE;
 620                 break;
 621         case SUBCTXT_UREGS:
 622                 memaddr = (u64)uctxt->subctxt_uregbase;
 623                 memlen = PAGE_SIZE;
 624                 flags |= VM_IO | VM_DONTEXPAND;
 625                 vmf = 1;
 626                 break;
 627         case SUBCTXT_RCV_HDRQ:
 628                 memaddr = (u64)uctxt->subctxt_rcvhdr_base;
 629                 memlen = uctxt->rcvhdrq_size * uctxt->subctxt_cnt;
 630                 flags |= VM_IO | VM_DONTEXPAND;
 631                 vmf = 1;
 632                 break;
 633         case SUBCTXT_EGRBUF:
 634                 memaddr = (u64)uctxt->subctxt_rcvegrbuf;
 635                 memlen = uctxt->egrbufs.size * uctxt->subctxt_cnt;
 636                 flags |= VM_IO | VM_DONTEXPAND;
 637                 flags &= ~VM_MAYWRITE;
 638                 vmf = 1;
 639                 break;
 640         case SDMA_COMP: {
 641                 struct hfi1_user_sdma_comp_q *cq = fd->cq;
 642
 643                 if (!cq) {
 644                         ret = -EFAULT;
 645                         goto done;
 646                 }
 647                 memaddr = (u64)cq->comps;
 648                 memlen = PAGE_ALIGN(sizeof(*cq->comps) * cq->nentries);
 649                 flags |= VM_IO | VM_DONTEXPAND;
 650                 vmf = 1;
 651                 break;
 652         }
 653         default:
 654                 ret = -EINVAL;
 655                 break;
 656         }
 657
 658         if ((vma->vm_end - vma->vm_start) != memlen) {
 659                 hfi1_cdbg(PROC, "%u:%u Memory size mismatch %lu:%lu",
 660                           uctxt->ctxt, fd->subctxt,
 661                           (vma->vm_end - vma->vm_start), memlen);
 662                 ret = -EINVAL;
 663                 goto done;
 664         }
 665
 666         vma->vm_flags = flags;
 667         hfi1_cdbg(PROC,
 668                   "%u:%u type:%u io/vf:%d/%d, addr:0x%llx, len:%lu(%lu), flags:0x%lx\n",
 669                     ctxt, subctxt, type, mapio, vmf, memaddr, memlen,
 670                     vma->vm_end - vma->vm_start, vma->vm_flags);
 671         if (vmf) {
 672                 vma->vm_pgoff = PFN_DOWN(memaddr);
 673                 vma->vm_ops = &vm_ops;
 674                 ret = 0;
 675         } else if (mapio) {
 676                 ret = io_remap_pfn_range(vma, vma->vm_start,
 677                                          PFN_DOWN(memaddr),
 678                                          memlen,
 679                                          vma->vm_page_prot);
 680         } else if (memvirt) {
 681                 ret = remap_pfn_range(vma, vma->vm_start,
 682                                       PFN_DOWN(__pa(memvirt)),
 683                                       memlen,
 684                                       vma->vm_page_prot);
 685         } else {
 686                 ret = remap_pfn_range(vma, vma->vm_start,
 687                                       PFN_DOWN(memaddr),
 688                                       memlen,
 689                                       vma->vm_page_prot);
 690         }
 691 done:
 692         return ret;
 693 }
 694
 695 /*
 696  * Local (non-chip) user memory is not mapped right away but as it is
 697  * accessed by the user-level code.
 698  */
 699 static int vma_fault(struct vm_fault *vmf)
 700 {
 701         struct page *page;
 702
 703         page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT));
 704         if (!page)
 705                 return VM_FAULT_SIGBUS;
 706
 707         get_page(page);
 708         vmf->page = page;
 709
 710         return 0;
 711 }
 712
 713 static unsigned int hfi1_poll(struct file *fp, struct poll_table_struct *pt)
 714 {
 715         struct hfi1_ctxtdata *uctxt;
 716         unsigned pollflag;
 717
 718         uctxt = ((struct hfi1_filedata *)fp->private_data)->uctxt;
 719         if (!uctxt)
 720                 pollflag = POLLERR;
 721         else if (uctxt->poll_type == HFI1_POLL_TYPE_URGENT)
 722                 pollflag = poll_urgent(fp, pt);
 723         else  if (uctxt->poll_type == HFI1_POLL_TYPE_ANYRCV)
 724                 pollflag = poll_next(fp, pt);
 725         else /* invalid */
 726                 pollflag = POLLERR;
 727
 728         return pollflag;
 729 }
 730
 731 static int hfi1_file_close(struct inode *inode, struct file *fp)
 732 {
 733         struct hfi1_filedata *fdata = fp->private_data;
 734         struct hfi1_ctxtdata *uctxt = fdata->uctxt;
 735         struct hfi1_devdata *dd = container_of(inode->i_cdev,
 736                                                struct hfi1_devdata,
 737                                                user_cdev);
 738         unsigned long flags, *ev;
 739
 740         fp->private_data = NULL;
 741
 742         if (!uctxt)
 743                 goto done;
 744
 745         hfi1_cdbg(PROC, "freeing ctxt %u:%u", uctxt->ctxt, fdata->subctxt);
 746         mutex_lock(&hfi1_mutex);
 747
 748         flush_wc();
 749         /* drain user sdma queue */
 750         hfi1_user_sdma_free_queues(fdata);
 751
 752         /* release the cpu */
 753         hfi1_put_proc_affinity(fdata->rec_cpu_num);
 754
 755         /*
 756          * Clear any left over, unhandled events so the next process that
 757          * gets this context doesn't get confused.
 758          */
 759         ev = dd->events + ((uctxt->ctxt - dd->first_user_ctxt) *
 760                            HFI1_MAX_SHARED_CTXTS) + fdata->subctxt;
 761         *ev = 0;
 762
 763         if (--uctxt->cnt) {
 764                 uctxt->active_slaves &= ~(1 << fdata->subctxt);
 765                 mutex_unlock(&hfi1_mutex);
 766                 goto done;
 767         }
 768
 769         spin_lock_irqsave(&dd->uctxt_lock, flags);
 770         /*
 771          * Disable receive context and interrupt available, reset all
 772          * RcvCtxtCtrl bits to default values.
 773          */
 774         hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_DIS |
 775                      HFI1_RCVCTRL_TIDFLOW_DIS |
 776                      HFI1_RCVCTRL_INTRAVAIL_DIS |
 777                      HFI1_RCVCTRL_TAILUPD_DIS |
 778                      HFI1_RCVCTRL_ONE_PKT_EGR_DIS |
 779                      HFI1_RCVCTRL_NO_RHQ_DROP_DIS |
 780                      HFI1_RCVCTRL_NO_EGR_DROP_DIS, uctxt->ctxt);
 781         /* Clear the context's J_KEY */
 782         hfi1_clear_ctxt_jkey(dd, uctxt->ctxt);
 783         /*
 784          * Reset context integrity checks to default.
 785          * (writes to CSRs probably belong in chip.c)
 786          */
 787         write_kctxt_csr(dd, uctxt->sc->hw_context, SEND_CTXT_CHECK_ENABLE,
 788                         hfi1_pkt_default_send_ctxt_mask(dd, uctxt->sc->type));
 789         sc_disable(uctxt->sc);
 790         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 791
 792         dd->rcd[uctxt->ctxt] = NULL;
 793
 794         hfi1_user_exp_rcv_free(fdata);
 795         hfi1_clear_ctxt_pkey(dd, uctxt->ctxt);
 796
 797         uctxt->rcvwait_to = 0;
 798         uctxt->piowait_to = 0;
 799         uctxt->rcvnowait = 0;
 800         uctxt->pionowait = 0;
 801         uctxt->event_flags = 0;
 802
 803         hfi1_stats.sps_ctxts--;
 804         if (++dd->freectxts == dd->num_user_contexts)
 805                 aspm_enable_all(dd);
 806         mutex_unlock(&hfi1_mutex);
 807         hfi1_free_ctxtdata(dd, uctxt);
 808 done:
 809         mmdrop(fdata->mm);
 810         kobject_put(&dd->kobj);
 811
 812         if (atomic_dec_and_test(&dd->user_refcount))
 813                 complete(&dd->user_comp);
 814
 815         kfree(fdata);
 816         return 0;
 817 }
 818
 819 /*
 820  * Convert kernel *virtual* addresses to physical addresses.
 821  * This is used to vmalloc'ed addresses.
 822  */
 823 static u64 kvirt_to_phys(void *addr)
 824 {
 825         struct page *page;
 826         u64 paddr = 0;
 827
 828         page = vmalloc_to_page(addr);
 829         if (page)
 830                 paddr = page_to_pfn(page) << PAGE_SHIFT;
 831
 832         return paddr;
 833 }
 834
 835 static int assign_ctxt(struct file *fp, struct hfi1_user_info *uinfo)
 836 {
 837         int i_minor, ret = 0;
 838         unsigned int swmajor, swminor;
 839
 840         swmajor = uinfo->userversion >> 16;
 841         if (swmajor != HFI1_USER_SWMAJOR) {
 842                 ret = -ENODEV;
 843                 goto done;
 844         }
 845
 846         swminor = uinfo->userversion & 0xffff;
 847
 848         mutex_lock(&hfi1_mutex);
 849         /* First, lets check if we need to setup a shared context? */
 850         if (uinfo->subctxt_cnt) {
 851                 struct hfi1_filedata *fd = fp->private_data;
 852
 853                 ret = find_shared_ctxt(fp, uinfo);
 854                 if (ret < 0)
 855                         goto done_unlock;
 856                 if (ret) {
 857                         fd->rec_cpu_num =
 858                                 hfi1_get_proc_affinity(fd->uctxt->numa_id);
 859                 }
 860         }
 861
 862         /*
 863          * We execute the following block if we couldn't find a
 864          * shared context or if context sharing is not required.
 865          */
 866         if (!ret) {
 867                 i_minor = iminor(file_inode(fp)) - HFI1_USER_MINOR_BASE;
 868                 ret = get_user_context(fp, uinfo, i_minor);
 869         }
 870 done_unlock:
 871         mutex_unlock(&hfi1_mutex);
 872 done:
 873         return ret;
 874 }
 875
 876 static int get_user_context(struct file *fp, struct hfi1_user_info *uinfo,
 877                             int devno)
 878 {
 879         struct hfi1_devdata *dd = NULL;
 880         int devmax, npresent, nup;
 881
 882         devmax = hfi1_count_units(&npresent, &nup);
 883         if (!npresent)
 884                 return -ENXIO;
 885
 886         if (!nup)
 887                 return -ENETDOWN;
 888
 889         dd = hfi1_lookup(devno);
 890         if (!dd)
 891                 return -ENODEV;
 892         else if (!dd->freectxts)
 893                 return -EBUSY;
 894
 895         return allocate_ctxt(fp, dd, uinfo);
 896 }
 897
 898 static int find_shared_ctxt(struct file *fp,
 899                             const struct hfi1_user_info *uinfo)
 900 {
 901         int devmax, ndev, i;
 902         int ret = 0;
 903         struct hfi1_filedata *fd = fp->private_data;
 904
 905         devmax = hfi1_count_units(NULL, NULL);
 906
 907         for (ndev = 0; ndev < devmax; ndev++) {
 908                 struct hfi1_devdata *dd = hfi1_lookup(ndev);
 909
 910                 if (!(dd && (dd->flags & HFI1_PRESENT) && dd->kregbase))
 911                         continue;
 912                 for (i = dd->first_user_ctxt; i < dd->num_rcv_contexts; i++) {
 913                         struct hfi1_ctxtdata *uctxt = dd->rcd[i];
 914
 915                         /* Skip ctxts which are not yet open */
 916                         if (!uctxt || !uctxt->cnt)
 917                                 continue;
 918                         /* Skip ctxt if it doesn't match the requested one */
 919                         if (memcmp(uctxt->uuid, uinfo->uuid,
 920                                    sizeof(uctxt->uuid)) ||
 921                             uctxt->jkey != generate_jkey(current_uid()) ||
 922                             uctxt->subctxt_id != uinfo->subctxt_id ||
 923                             uctxt->subctxt_cnt != uinfo->subctxt_cnt)
 924                                 continue;
 925
 926                         /* Verify the sharing process matches the master */
 927                         if (uctxt->userversion != uinfo->userversion ||
 928                             uctxt->cnt >= uctxt->subctxt_cnt) {
 929                                 ret = -EINVAL;
 930                                 goto done;
 931                         }
 932                         fd->uctxt = uctxt;
 933                         fd->subctxt  = uctxt->cnt++;
 934                         uctxt->active_slaves |= 1 << fd->subctxt;
 935                         ret = 1;
 936                         goto done;
 937                 }
 938         }
 939
 940 done:
 941         return ret;
 942 }
 943
 944 static int allocate_ctxt(struct file *fp, struct hfi1_devdata *dd,
 945                          struct hfi1_user_info *uinfo)
 946 {
 947         struct hfi1_filedata *fd = fp->private_data;
 948         struct hfi1_ctxtdata *uctxt;
 949         unsigned ctxt;
 950         int ret, numa;
 951
 952         if (dd->flags & HFI1_FROZEN) {
 953                 /*
 954                  * Pick an error that is unique from all other errors
 955                  * that are returned so the user process knows that
 956                  * it tried to allocate while the SPC was frozen.  It
 957                  * it should be able to retry with success in a short
 958                  * while.
 959                  */
 960                 return -EIO;
 961         }
 962
 963         for (ctxt = dd->first_user_ctxt; ctxt < dd->num_rcv_contexts; ctxt++)
 964                 if (!dd->rcd[ctxt])
 965                         break;
 966
 967         if (ctxt == dd->num_rcv_contexts)
 968                 return -EBUSY;
 969
 970         /*
 971          * If we don't have a NUMA node requested, preference is towards
 972          * device NUMA node.
 973          */
 974         fd->rec_cpu_num = hfi1_get_proc_affinity(dd->node);
 975         if (fd->rec_cpu_num != -1)
 976                 numa = cpu_to_node(fd->rec_cpu_num);
 977         else
 978                 numa = numa_node_id();
 979         uctxt = hfi1_create_ctxtdata(dd->pport, ctxt, numa);
 980         if (!uctxt) {
 981                 dd_dev_err(dd,
 982                            "Unable to allocate ctxtdata memory, failing open\n");
 983                 return -ENOMEM;
 984         }
 985         hfi1_cdbg(PROC, "[%u:%u] pid %u assigned to CPU %d (NUMA %u)",
 986                   uctxt->ctxt, fd->subctxt, current->pid, fd->rec_cpu_num,
 987                   uctxt->numa_id);
 988
 989         /*
 990          * Allocate and enable a PIO send context.
 991          */
 992         uctxt->sc = sc_alloc(dd, SC_USER, uctxt->rcvhdrqentsize,
 993                              uctxt->dd->node);
 994         if (!uctxt->sc) {
 995                 ret = -ENOMEM;
 996                 goto ctxdata_free;
 997         }
 998         hfi1_cdbg(PROC, "allocated send context %u(%u)\n", uctxt->sc->sw_index,
 999                   uctxt->sc->hw_context);
1000         ret = sc_enable(uctxt->sc);
1001         if (ret)
1002                 goto ctxdata_free;
1003
1004         /*
1005          * Setup shared context resources if the user-level has requested
1006          * shared contexts and this is the 'master' process.
1007          * This has to be done here so the rest of the sub-contexts find the
1008          * proper master.
1009          */
1010         if (uinfo->subctxt_cnt && !fd->subctxt) {
1011                 ret = init_subctxts(uctxt, uinfo);
1012                 /*
1013                  * On error, we don't need to disable and de-allocate the
1014                  * send context because it will be done during file close
1015                  */
1016                 if (ret)
1017                         goto ctxdata_free;
1018         }
1019         uctxt->userversion = uinfo->userversion;
1020         uctxt->flags = hfi1_cap_mask; /* save current flag state */
1021         init_waitqueue_head(&uctxt->wait);
1022         strlcpy(uctxt->comm, current->comm, sizeof(uctxt->comm));
1023         memcpy(uctxt->uuid, uinfo->uuid, sizeof(uctxt->uuid));
1024         uctxt->jkey = generate_jkey(current_uid());
1025         INIT_LIST_HEAD(&uctxt->sdma_queues);
1026         spin_lock_init(&uctxt->sdma_qlock);
1027         hfi1_stats.sps_ctxts++;
1028         /*
1029          * Disable ASPM when there are open user/PSM contexts to avoid
1030          * issues with ASPM L1 exit latency
1031          */
1032         if (dd->freectxts-- == dd->num_user_contexts)
1033                 aspm_disable_all(dd);
1034         fd->uctxt = uctxt;
1035
1036         return 0;
1037
1038 ctxdata_free:
1039         dd->rcd[ctxt] = NULL;
1040         hfi1_free_ctxtdata(dd, uctxt);
1041         return ret;
1042 }
1043
1044 static int init_subctxts(struct hfi1_ctxtdata *uctxt,
1045                          const struct hfi1_user_info *uinfo)
1046 {
1047         unsigned num_subctxts;
1048
1049         num_subctxts = uinfo->subctxt_cnt;
1050         if (num_subctxts > HFI1_MAX_SHARED_CTXTS)
1051                 return -EINVAL;
1052
1053         uctxt->subctxt_cnt = uinfo->subctxt_cnt;
1054         uctxt->subctxt_id = uinfo->subctxt_id;
1055         uctxt->active_slaves = 1;
1056         uctxt->redirect_seq_cnt = 1;
1057         set_bit(HFI1_CTXT_MASTER_UNINIT, &uctxt->event_flags);
1058
1059         return 0;
1060 }
1061
1062 static int setup_subctxt(struct hfi1_ctxtdata *uctxt)
1063 {
1064         int ret = 0;
1065         unsigned num_subctxts = uctxt->subctxt_cnt;
1066
1067         uctxt->subctxt_uregbase = vmalloc_user(PAGE_SIZE);
1068         if (!uctxt->subctxt_uregbase) {
1069                 ret = -ENOMEM;
1070                 goto bail;
1071         }
1072         /* We can take the size of the RcvHdr Queue from the master */
1073         uctxt->subctxt_rcvhdr_base = vmalloc_user(uctxt->rcvhdrq_size *
1074                                                   num_subctxts);
1075         if (!uctxt->subctxt_rcvhdr_base) {
1076                 ret = -ENOMEM;
1077                 goto bail_ureg;
1078         }
1079
1080         uctxt->subctxt_rcvegrbuf = vmalloc_user(uctxt->egrbufs.size *
1081                                                 num_subctxts);
1082         if (!uctxt->subctxt_rcvegrbuf) {
1083                 ret = -ENOMEM;
1084                 goto bail_rhdr;
1085         }
1086         goto bail;
1087 bail_rhdr:
1088         vfree(uctxt->subctxt_rcvhdr_base);
1089 bail_ureg:
1090         vfree(uctxt->subctxt_uregbase);
1091         uctxt->subctxt_uregbase = NULL;
1092 bail:
1093         return ret;
1094 }
1095
1096 static int user_init(struct file *fp)
1097 {
1098         unsigned int rcvctrl_ops = 0;
1099         struct hfi1_filedata *fd = fp->private_data;
1100         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1101
1102         /* make sure that the context has already been setup */
1103         if (!test_bit(HFI1_CTXT_SETUP_DONE, &uctxt->event_flags))
1104                 return -EFAULT;
1105
1106         /* initialize poll variables... */
1107         uctxt->urgent = 0;
1108         uctxt->urgent_poll = 0;
1109
1110         /*
1111          * Now enable the ctxt for receive.
1112          * For chips that are set to DMA the tail register to memory
1113          * when they change (and when the update bit transitions from
1114          * 0 to 1.  So for those chips, we turn it off and then back on.
1115          * This will (very briefly) affect any other open ctxts, but the
1116          * duration is very short, and therefore isn't an issue.  We
1117          * explicitly set the in-memory tail copy to 0 beforehand, so we
1118          * don't have to wait to be sure the DMA update has happened
1119          * (chip resets head/tail to 0 on transition to enable).
1120          */
1121         if (uctxt->rcvhdrtail_kvaddr)
1122                 clear_rcvhdrtail(uctxt);
1123
1124         /* Setup J_KEY before enabling the context */
1125         hfi1_set_ctxt_jkey(uctxt->dd, uctxt->ctxt, uctxt->jkey);
1126
1127         rcvctrl_ops = HFI1_RCVCTRL_CTXT_ENB;
1128         if (HFI1_CAP_UGET_MASK(uctxt->flags, HDRSUPP))
1129                 rcvctrl_ops |= HFI1_RCVCTRL_TIDFLOW_ENB;
1130         /*
1131          * Ignore the bit in the flags for now until proper
1132          * support for multiple packet per rcv array entry is
1133          * added.
1134          */
1135         if (!HFI1_CAP_UGET_MASK(uctxt->flags, MULTI_PKT_EGR))
1136                 rcvctrl_ops |= HFI1_RCVCTRL_ONE_PKT_EGR_ENB;
1137         if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_EGR_FULL))
1138                 rcvctrl_ops |= HFI1_RCVCTRL_NO_EGR_DROP_ENB;
1139         if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_RHQ_FULL))
1140                 rcvctrl_ops |= HFI1_RCVCTRL_NO_RHQ_DROP_ENB;
1141         /*
1142          * The RcvCtxtCtrl.TailUpd bit has to be explicitly written.
1143          * We can't rely on the correct value to be set from prior
1144          * uses of the chip or ctxt. Therefore, add the rcvctrl op
1145          * for both cases.
1146          */
1147         if (HFI1_CAP_UGET_MASK(uctxt->flags, DMA_RTAIL))
1148                 rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_ENB;
1149         else
1150                 rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_DIS;
1151         hfi1_rcvctrl(uctxt->dd, rcvctrl_ops, uctxt->ctxt);
1152
1153         /* Notify any waiting slaves */
1154         if (uctxt->subctxt_cnt) {
1155                 clear_bit(HFI1_CTXT_MASTER_UNINIT, &uctxt->event_flags);
1156                 wake_up(&uctxt->wait);
1157         }
1158
1159         return 0;
1160 }
1161
1162 static int get_ctxt_info(struct file *fp, void __user *ubase, __u32 len)
1163 {
1164         struct hfi1_ctxt_info cinfo;
1165         struct hfi1_filedata *fd = fp->private_data;
1166         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1167         int ret = 0;
1168
1169         memset(&cinfo, 0, sizeof(cinfo));
1170         cinfo.runtime_flags = (((uctxt->flags >> HFI1_CAP_MISC_SHIFT) &
1171                                 HFI1_CAP_MISC_MASK) << HFI1_CAP_USER_SHIFT) |
1172                         HFI1_CAP_UGET_MASK(uctxt->flags, MASK) |
1173                         HFI1_CAP_KGET_MASK(uctxt->flags, K2U);
1174         /* adjust flag if this fd is not able to cache */
1175         if (!fd->handler)
1176                 cinfo.runtime_flags |= HFI1_CAP_TID_UNMAP; /* no caching */
1177
1178         cinfo.num_active = hfi1_count_active_units();
1179         cinfo.unit = uctxt->dd->unit;
1180         cinfo.ctxt = uctxt->ctxt;
1181         cinfo.subctxt = fd->subctxt;
1182         cinfo.rcvtids = roundup(uctxt->egrbufs.alloced,
1183                                 uctxt->dd->rcv_entries.group_size) +
1184                 uctxt->expected_count;
1185         cinfo.credits = uctxt->sc->credits;
1186         cinfo.numa_node = uctxt->numa_id;
1187         cinfo.rec_cpu = fd->rec_cpu_num;
1188         cinfo.send_ctxt = uctxt->sc->hw_context;
1189
1190         cinfo.egrtids = uctxt->egrbufs.alloced;
1191         cinfo.rcvhdrq_cnt = uctxt->rcvhdrq_cnt;
1192         cinfo.rcvhdrq_entsize = uctxt->rcvhdrqentsize << 2;
1193         cinfo.sdma_ring_size = fd->cq->nentries;
1194         cinfo.rcvegr_size = uctxt->egrbufs.rcvtid_size;
1195
1196         trace_hfi1_ctxt_info(uctxt->dd, uctxt->ctxt, fd->subctxt, cinfo);
1197         if (copy_to_user(ubase, &cinfo, sizeof(cinfo)))
1198                 ret = -EFAULT;
1199
1200         return ret;
1201 }
1202
1203 static int setup_ctxt(struct file *fp)
1204 {
1205         struct hfi1_filedata *fd = fp->private_data;
1206         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1207         struct hfi1_devdata *dd = uctxt->dd;
1208         int ret = 0;
1209
1210         /*
1211          * Context should be set up only once, including allocation and
1212          * programming of eager buffers. This is done if context sharing
1213          * is not requested or by the master process.
1214          */
1215         if (!uctxt->subctxt_cnt || !fd->subctxt) {
1216                 ret = hfi1_init_ctxt(uctxt->sc);
1217                 if (ret)
1218                         goto done;
1219
1220                 /* Now allocate the RcvHdr queue and eager buffers. */
1221                 ret = hfi1_create_rcvhdrq(dd, uctxt);
1222                 if (ret)
1223                         goto done;
1224                 ret = hfi1_setup_eagerbufs(uctxt);
1225                 if (ret)
1226                         goto done;
1227                 if (uctxt->subctxt_cnt && !fd->subctxt) {
1228                         ret = setup_subctxt(uctxt);
1229                         if (ret)
1230                                 goto done;
1231                 }
1232         } else {
1233                 ret = wait_event_interruptible(uctxt->wait, !test_bit(
1234                                                HFI1_CTXT_MASTER_UNINIT,
1235                                                &uctxt->event_flags));
1236                 if (ret)
1237                         goto done;
1238         }
1239
1240         ret = hfi1_user_sdma_alloc_queues(uctxt, fp);
1241         if (ret)
1242                 goto done;
1243         /*
1244          * Expected receive has to be setup for all processes (including
1245          * shared contexts). However, it has to be done after the master
1246          * context has been fully configured as it depends on the
1247          * eager/expected split of the RcvArray entries.
1248          * Setting it up here ensures that the subcontexts will be waiting
1249          * (due to the above wait_event_interruptible() until the master
1250          * is setup.
1251          */
1252         ret = hfi1_user_exp_rcv_init(fp);
1253         if (ret)
1254                 goto done;
1255
1256         set_bit(HFI1_CTXT_SETUP_DONE, &uctxt->event_flags);
1257 done:
1258         return ret;
1259 }
1260
1261 static int get_base_info(struct file *fp, void __user *ubase, __u32 len)
1262 {
1263         struct hfi1_base_info binfo;
1264         struct hfi1_filedata *fd = fp->private_data;
1265         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1266         struct hfi1_devdata *dd = uctxt->dd;
1267         ssize_t sz;
1268         unsigned offset;
1269         int ret = 0;
1270
1271         trace_hfi1_uctxtdata(uctxt->dd, uctxt);
1272
1273         memset(&binfo, 0, sizeof(binfo));
1274         binfo.hw_version = dd->revision;
1275         binfo.sw_version = HFI1_KERN_SWVERSION;
1276         binfo.bthqp = kdeth_qp;
1277         binfo.jkey = uctxt->jkey;
1278         /*
1279          * If more than 64 contexts are enabled the allocated credit
1280          * return will span two or three contiguous pages. Since we only
1281          * map the page containing the context's credit return address,
1282          * we need to calculate the offset in the proper page.
1283          */
1284         offset = ((u64)uctxt->sc->hw_free -
1285                   (u64)dd->cr_base[uctxt->numa_id].va) % PAGE_SIZE;
1286         binfo.sc_credits_addr = HFI1_MMAP_TOKEN(PIO_CRED, uctxt->ctxt,
1287                                                 fd->subctxt, offset);
1288         binfo.pio_bufbase = HFI1_MMAP_TOKEN(PIO_BUFS, uctxt->ctxt,
1289                                             fd->subctxt,
1290                                             uctxt->sc->base_addr);
1291         binfo.pio_bufbase_sop = HFI1_MMAP_TOKEN(PIO_BUFS_SOP,
1292                                                 uctxt->ctxt,
1293                                                 fd->subctxt,
1294                                                 uctxt->sc->base_addr);
1295         binfo.rcvhdr_bufbase = HFI1_MMAP_TOKEN(RCV_HDRQ, uctxt->ctxt,
1296                                                fd->subctxt,
1297                                                uctxt->rcvhdrq);
1298         binfo.rcvegr_bufbase = HFI1_MMAP_TOKEN(RCV_EGRBUF, uctxt->ctxt,
1299                                                fd->subctxt,
1300                                                uctxt->egrbufs.rcvtids[0].dma);
1301         binfo.sdma_comp_bufbase = HFI1_MMAP_TOKEN(SDMA_COMP, uctxt->ctxt,
1302                                                  fd->subctxt, 0);
1303         /*
1304          * user regs are at
1305          * (RXE_PER_CONTEXT_USER + (ctxt * RXE_PER_CONTEXT_SIZE))
1306          */
1307         binfo.user_regbase = HFI1_MMAP_TOKEN(UREGS, uctxt->ctxt,
1308                                             fd->subctxt, 0);
1309         offset = offset_in_page((((uctxt->ctxt - dd->first_user_ctxt) *
1310                     HFI1_MAX_SHARED_CTXTS) + fd->subctxt) *
1311                   sizeof(*dd->events));
1312         binfo.events_bufbase = HFI1_MMAP_TOKEN(EVENTS, uctxt->ctxt,
1313                                               fd->subctxt,
1314                                               offset);
1315         binfo.status_bufbase = HFI1_MMAP_TOKEN(STATUS, uctxt->ctxt,
1316                                               fd->subctxt,
1317                                               dd->status);
1318         if (HFI1_CAP_IS_USET(DMA_RTAIL))
1319                 binfo.rcvhdrtail_base = HFI1_MMAP_TOKEN(RTAIL, uctxt->ctxt,
1320                                                        fd->subctxt, 0);
1321         if (uctxt->subctxt_cnt) {
1322                 binfo.subctxt_uregbase = HFI1_MMAP_TOKEN(SUBCTXT_UREGS,
1323                                                         uctxt->ctxt,
1324                                                         fd->subctxt, 0);
1325                 binfo.subctxt_rcvhdrbuf = HFI1_MMAP_TOKEN(SUBCTXT_RCV_HDRQ,
1326                                                          uctxt->ctxt,
1327                                                          fd->subctxt, 0);
1328                 binfo.subctxt_rcvegrbuf = HFI1_MMAP_TOKEN(SUBCTXT_EGRBUF,
1329                                                          uctxt->ctxt,
1330                                                          fd->subctxt, 0);
1331         }
1332         sz = (len < sizeof(binfo)) ? len : sizeof(binfo);
1333         if (copy_to_user(ubase, &binfo, sz))
1334                 ret = -EFAULT;
1335         return ret;
1336 }
1337
1338 static unsigned int poll_urgent(struct file *fp,
1339                                 struct poll_table_struct *pt)
1340 {
1341         struct hfi1_filedata *fd = fp->private_data;
1342         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1343         struct hfi1_devdata *dd = uctxt->dd;
1344         unsigned pollflag;
1345
1346         poll_wait(fp, &uctxt->wait, pt);
1347
1348         spin_lock_irq(&dd->uctxt_lock);
1349         if (uctxt->urgent != uctxt->urgent_poll) {
1350                 pollflag = POLLIN | POLLRDNORM;
1351                 uctxt->urgent_poll = uctxt->urgent;
1352         } else {
1353                 pollflag = 0;
1354                 set_bit(HFI1_CTXT_WAITING_URG, &uctxt->event_flags);
1355         }
1356         spin_unlock_irq(&dd->uctxt_lock);
1357
1358         return pollflag;
1359 }
1360
1361 static unsigned int poll_next(struct file *fp,
1362                               struct poll_table_struct *pt)
1363 {
1364         struct hfi1_filedata *fd = fp->private_data;
1365         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1366         struct hfi1_devdata *dd = uctxt->dd;
1367         unsigned pollflag;
1368
1369         poll_wait(fp, &uctxt->wait, pt);
1370
1371         spin_lock_irq(&dd->uctxt_lock);
1372         if (hdrqempty(uctxt)) {
1373                 set_bit(HFI1_CTXT_WAITING_RCV, &uctxt->event_flags);
1374                 hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_ENB, uctxt->ctxt);
1375                 pollflag = 0;
1376         } else {
1377                 pollflag = POLLIN | POLLRDNORM;
1378         }
1379         spin_unlock_irq(&dd->uctxt_lock);
1380
1381         return pollflag;
1382 }
1383
1384 /*
1385  * Find all user contexts in use, and set the specified bit in their
1386  * event mask.
1387  * See also find_ctxt() for a similar use, that is specific to send buffers.
1388  */
1389 int hfi1_set_uevent_bits(struct hfi1_pportdata *ppd, const int evtbit)
1390 {
1391         struct hfi1_ctxtdata *uctxt;
1392         struct hfi1_devdata *dd = ppd->dd;
1393         unsigned ctxt;
1394         int ret = 0;
1395         unsigned long flags;
1396
1397         if (!dd->events) {
1398                 ret = -EINVAL;
1399                 goto done;
1400         }
1401
1402         spin_lock_irqsave(&dd->uctxt_lock, flags);
1403         for (ctxt = dd->first_user_ctxt; ctxt < dd->num_rcv_contexts;
1404              ctxt++) {
1405                 uctxt = dd->rcd[ctxt];
1406                 if (uctxt) {
1407                         unsigned long *evs = dd->events +
1408                                 (uctxt->ctxt - dd->first_user_ctxt) *
1409                                 HFI1_MAX_SHARED_CTXTS;
1410                         int i;
1411                         /*
1412                          * subctxt_cnt is 0 if not shared, so do base
1413                          * separately, first, then remaining subctxt, if any
1414                          */
1415                         set_bit(evtbit, evs);
1416                         for (i = 1; i < uctxt->subctxt_cnt; i++)
1417                                 set_bit(evtbit, evs + i);
1418                 }
1419         }
1420         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1421 done:
1422         return ret;
1423 }
1424
1425 /**
1426  * manage_rcvq - manage a context's receive queue
1427  * @uctxt: the context
1428  * @subctxt: the sub-context
1429  * @start_stop: action to carry out
1430  *
1431  * start_stop == 0 disables receive on the context, for use in queue
1432  * overflow conditions.  start_stop==1 re-enables, to be used to
1433  * re-init the software copy of the head register
1434  */
1435 static int manage_rcvq(struct hfi1_ctxtdata *uctxt, unsigned subctxt,
1436                        int start_stop)
1437 {
1438         struct hfi1_devdata *dd = uctxt->dd;
1439         unsigned int rcvctrl_op;
1440
1441         if (subctxt)
1442                 goto bail;
1443         /* atomically clear receive enable ctxt. */
1444         if (start_stop) {
1445                 /*
1446                  * On enable, force in-memory copy of the tail register to
1447                  * 0, so that protocol code doesn't have to worry about
1448                  * whether or not the chip has yet updated the in-memory
1449                  * copy or not on return from the system call. The chip
1450                  * always resets it's tail register back to 0 on a
1451                  * transition from disabled to enabled.
1452                  */
1453                 if (uctxt->rcvhdrtail_kvaddr)
1454                         clear_rcvhdrtail(uctxt);
1455                 rcvctrl_op = HFI1_RCVCTRL_CTXT_ENB;
1456         } else {
1457                 rcvctrl_op = HFI1_RCVCTRL_CTXT_DIS;
1458         }
1459         hfi1_rcvctrl(dd, rcvctrl_op, uctxt->ctxt);
1460         /* always; new head should be equal to new tail; see above */
1461 bail:
1462         return 0;
1463 }
1464
1465 /*
1466  * clear the event notifier events for this context.
1467  * User process then performs actions appropriate to bit having been
1468  * set, if desired, and checks again in future.
1469  */
1470 static int user_event_ack(struct hfi1_ctxtdata *uctxt, int subctxt,
1471                           unsigned long events)
1472 {
1473         int i;
1474         struct hfi1_devdata *dd = uctxt->dd;
1475         unsigned long *evs;
1476
1477         if (!dd->events)
1478                 return 0;
1479
1480         evs = dd->events + ((uctxt->ctxt - dd->first_user_ctxt) *
1481                             HFI1_MAX_SHARED_CTXTS) + subctxt;
1482
1483         for (i = 0; i <= _HFI1_MAX_EVENT_BIT; i++) {
1484                 if (!test_bit(i, &events))
1485                         continue;
1486                 clear_bit(i, evs);
1487         }
1488         return 0;
1489 }
1490
1491 static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, unsigned subctxt,
1492                          u16 pkey)
1493 {
1494         int ret = -ENOENT, i, intable = 0;
1495         struct hfi1_pportdata *ppd = uctxt->ppd;
1496         struct hfi1_devdata *dd = uctxt->dd;
1497
1498         if (pkey == LIM_MGMT_P_KEY || pkey == FULL_MGMT_P_KEY) {
1499                 ret = -EINVAL;
1500                 goto done;
1501         }
1502
1503         for (i = 0; i < ARRAY_SIZE(ppd->pkeys); i++)
1504                 if (pkey == ppd->pkeys[i]) {
1505                         intable = 1;
1506                         break;
1507                 }
1508
1509         if (intable)
1510                 ret = hfi1_set_ctxt_pkey(dd, uctxt->ctxt, pkey);
1511 done:
1512         return ret;
1513 }
1514
1515 static void user_remove(struct hfi1_devdata *dd)
1516 {
1517
1518         hfi1_cdev_cleanup(&dd->user_cdev, &dd->user_device);
1519 }
1520
1521 static int user_add(struct hfi1_devdata *dd)
1522 {
1523         char name[10];
1524         int ret;
1525
1526         snprintf(name, sizeof(name), "%s_%d", class_name(), dd->unit);
1527         ret = hfi1_cdev_init(dd->unit, name, &hfi1_file_ops,
1528                              &dd->user_cdev, &dd->user_device,
1529                              true, &dd->kobj);
1530         if (ret)
1531                 user_remove(dd);
1532
1533         return ret;
1534 }
1535
1536 /*
1537  * Create per-unit files in /dev
1538  */
1539 int hfi1_device_create(struct hfi1_devdata *dd)
1540 {
1541         return user_add(dd);
1542 }
1543
1544 /*
1545  * Remove per-unit files in /dev
1546  * void, core kernel returns no errors for this stuff
1547  */
1548 void hfi1_device_remove(struct hfi1_devdata *dd)
1549 {
1550         user_remove(dd);
1551 }