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