drivers/infiniband/hw/hfi1/file_ops.c

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