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