drivers/infiniband/hw/hfi1/file

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
is_valid_mmap
hfi1_file_open
hfi1_file_ioctl
hfi1_write_iter
hfi1_file_mmap
vma_fault
hfi1_poll
hfi1_file_close
kvirt_to_phys
complete_subctxt
assign_ctxt
match_ctxt
find_sub_ctxt
allocate_ctxt
deallocate_ctxt
init_subctxts
setup_subctxt
user_init
get_ctxt_info
init_user_ctxt
setup_base_ctxt
get_base_info
user_exp_rcv_setup
user_exp_rcv_clear
user_exp_rcv_invalid
poll_urgent
poll_next
hfi1_set_uevent_bits
manage_rcvq
user_event_ack
set_ctxt_pkey
ctxt_reset
user_remove
user_add
hfi1_device_create
hfi1_device_remove
   1 /*
   2  * Copyright(c) 2015-2017 Intel Corporation.
   3  *
   4  * This file is provided under a dual BSD/GPLv2 license.  When using or
   5  * redistributing this file, you may do so under either license.
   6  *
   7  * GPL LICENSE SUMMARY
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * BSD LICENSE
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  *
  24  *  - Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  *  - Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in
  28  *    the documentation and/or other materials provided with the
  29  *    distribution.
  30  *  - Neither the name of Intel Corporation nor the names of its
  31  *    contributors may be used to endorse or promote products derived
  32  *    from this software without specific prior written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45  *
  46  */
  47 #include <linux/poll.h>
  48 #include <linux/cdev.h>
  49 #include <linux/vmalloc.h>
  50 #include <linux/io.h>
  51 #include <linux/sched/mm.h>
  52 #include <linux/bitmap.h>
  53 
  54 #include <rdma/ib.h>
  55 
  56 #include "hfi.h"
  57 #include "pio.h"
  58 #include "device.h"
  59 #include "common.h"
  60 #include "trace.h"
  61 #include "mmu_rb.h"
  62 #include "user_sdma.h"
  63 #include "user_exp_rcv.h"
  64 #include "aspm.h"
  65 
  66 #undef pr_fmt
  67 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
  68 
  69 #define SEND_CTXT_HALT_TIMEOUT 1000 /* msecs */
  70 
  71 /*
  72  * File operation functions
  73  */
  74 static int hfi1_file_open(struct inode *inode, struct file *fp);
  75 static int hfi1_file_close(struct inode *inode, struct file *fp);
  76 static ssize_t hfi1_write_iter(struct kiocb *kiocb, struct iov_iter *from);
  77 static __poll_t hfi1_poll(struct file *fp, struct poll_table_struct *pt);
  78 static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma);
  79 
  80 static u64 kvirt_to_phys(void *addr);
  81 static int assign_ctxt(struct hfi1_filedata *fd, unsigned long arg, u32 len);
  82 static void init_subctxts(struct hfi1_ctxtdata *uctxt,
  83                           const struct hfi1_user_info *uinfo);
  84 static int init_user_ctxt(struct hfi1_filedata *fd,
  85                           struct hfi1_ctxtdata *uctxt);
  86 static void user_init(struct hfi1_ctxtdata *uctxt);
  87 static int get_ctxt_info(struct hfi1_filedata *fd, unsigned long arg, u32 len);
  88 static int get_base_info(struct hfi1_filedata *fd, unsigned long arg, u32 len);
  89 static int user_exp_rcv_setup(struct hfi1_filedata *fd, unsigned long arg,
  90                               u32 len);
  91 static int user_exp_rcv_clear(struct hfi1_filedata *fd, unsigned long arg,
  92                               u32 len);
  93 static int user_exp_rcv_invalid(struct hfi1_filedata *fd, unsigned long arg,
  94                                 u32 len);
  95 static int setup_base_ctxt(struct hfi1_filedata *fd,
  96                            struct hfi1_ctxtdata *uctxt);
  97 static int setup_subctxt(struct hfi1_ctxtdata *uctxt);
  98 
  99 static int find_sub_ctxt(struct hfi1_filedata *fd,
 100                          const struct hfi1_user_info *uinfo);
 101 static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
 102                          struct hfi1_user_info *uinfo,
 103                          struct hfi1_ctxtdata **cd);
 104 static void deallocate_ctxt(struct hfi1_ctxtdata *uctxt);
 105 static __poll_t poll_urgent(struct file *fp, struct poll_table_struct *pt);
 106 static __poll_t poll_next(struct file *fp, struct poll_table_struct *pt);
 107 static int user_event_ack(struct hfi1_ctxtdata *uctxt, u16 subctxt,
 108                           unsigned long arg);
 109 static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, unsigned long arg);
 110 static int ctxt_reset(struct hfi1_ctxtdata *uctxt);
 111 static int manage_rcvq(struct hfi1_ctxtdata *uctxt, u16 subctxt,
 112                        unsigned long arg);
 113 static vm_fault_t vma_fault(struct vm_fault *vmf);
 114 static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
 115                             unsigned long arg);
 116 
 117 static const struct file_operations hfi1_file_ops = {
 118         .owner = THIS_MODULE,
 119         .write_iter = hfi1_write_iter,
 120         .open = hfi1_file_open,
 121         .release = hfi1_file_close,
 122         .unlocked_ioctl = hfi1_file_ioctl,
 123         .poll = hfi1_poll,
 124         .mmap = hfi1_file_mmap,
 125         .llseek = noop_llseek,
 126 };
 127 
 128 static const struct vm_operations_struct vm_ops = {
 129         .fault = vma_fault,
 130 };
 131 
 132 /*
 133  * Types of memories mapped into user processes' space
 134  */
 135 enum mmap_types {
 136         PIO_BUFS = 1,
 137         PIO_BUFS_SOP,
 138         PIO_CRED,
 139         RCV_HDRQ,
 140         RCV_EGRBUF,
 141         UREGS,
 142         EVENTS,
 143         STATUS,
 144         RTAIL,
 145         SUBCTXT_UREGS,
 146         SUBCTXT_RCV_HDRQ,
 147         SUBCTXT_EGRBUF,
 148         SDMA_COMP
 149 };
 150 
 151 /*
 152  * Masks and offsets defining the mmap tokens
 153  */
 154 #define HFI1_MMAP_OFFSET_MASK   0xfffULL
 155 #define HFI1_MMAP_OFFSET_SHIFT  0
 156 #define HFI1_MMAP_SUBCTXT_MASK  0xfULL
 157 #define HFI1_MMAP_SUBCTXT_SHIFT 12
 158 #define HFI1_MMAP_CTXT_MASK     0xffULL
 159 #define HFI1_MMAP_CTXT_SHIFT    16
 160 #define HFI1_MMAP_TYPE_MASK     0xfULL
 161 #define HFI1_MMAP_TYPE_SHIFT    24
 162 #define HFI1_MMAP_MAGIC_MASK    0xffffffffULL
 163 #define HFI1_MMAP_MAGIC_SHIFT   32
 164 
 165 #define HFI1_MMAP_MAGIC         0xdabbad00
 166 
 167 #define HFI1_MMAP_TOKEN_SET(field, val) \
 168         (((val) & HFI1_MMAP_##field##_MASK) << HFI1_MMAP_##field##_SHIFT)
 169 #define HFI1_MMAP_TOKEN_GET(field, token) \
 170         (((token) >> HFI1_MMAP_##field##_SHIFT) & HFI1_MMAP_##field##_MASK)
 171 #define HFI1_MMAP_TOKEN(type, ctxt, subctxt, addr)   \
 172         (HFI1_MMAP_TOKEN_SET(MAGIC, HFI1_MMAP_MAGIC) | \
 173         HFI1_MMAP_TOKEN_SET(TYPE, type) | \
 174         HFI1_MMAP_TOKEN_SET(CTXT, ctxt) | \
 175         HFI1_MMAP_TOKEN_SET(SUBCTXT, subctxt) | \
 176         HFI1_MMAP_TOKEN_SET(OFFSET, (offset_in_page(addr))))
 177 
 178 #define dbg(fmt, ...)                           \
 179         pr_info(fmt, ##__VA_ARGS__)
 180 
 181 static inline int is_valid_mmap(u64 token)
 182 {
 183         return (HFI1_MMAP_TOKEN_GET(MAGIC, token) == HFI1_MMAP_MAGIC);
 184 }
 185 
 186 static int hfi1_file_open(struct inode *inode, struct file *fp)
 187 {
 188         struct hfi1_filedata *fd;
 189         struct hfi1_devdata *dd = container_of(inode->i_cdev,
 190                                                struct hfi1_devdata,
 191                                                user_cdev);
 192 
 193         if (!((dd->flags & HFI1_PRESENT) && dd->kregbase1))
 194                 return -EINVAL;
 195 
 196         if (!atomic_inc_not_zero(&dd->user_refcount))
 197                 return -ENXIO;
 198 
 199         /* The real work is performed later in assign_ctxt() */
 200 
 201         fd = kzalloc(sizeof(*fd), GFP_KERNEL);
 202 
 203         if (!fd || init_srcu_struct(&fd->pq_srcu))
 204                 goto nomem;
 205         spin_lock_init(&fd->pq_rcu_lock);
 206         spin_lock_init(&fd->tid_lock);
 207         spin_lock_init(&fd->invalid_lock);
 208         fd->rec_cpu_num = -1; /* no cpu affinity by default */
 209         fd->mm = current->mm;
 210         mmgrab(fd->mm);
 211         fd->dd = dd;
 212         kobject_get(&fd->dd->kobj);
 213         fp->private_data = fd;
 214         return 0;
 215 nomem:
 216         kfree(fd);
 217         fp->private_data = NULL;
 218         if (atomic_dec_and_test(&dd->user_refcount))
 219                 complete(&dd->user_comp);
 220         return -ENOMEM;
 221 }
 222 
 223 static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
 224                             unsigned long arg)
 225 {
 226         struct hfi1_filedata *fd = fp->private_data;
 227         struct hfi1_ctxtdata *uctxt = fd->uctxt;
 228         int ret = 0;
 229         int uval = 0;
 230 
 231         hfi1_cdbg(IOCTL, "IOCTL recv: 0x%x", cmd);
 232         if (cmd != HFI1_IOCTL_ASSIGN_CTXT &&
 233             cmd != HFI1_IOCTL_GET_VERS &&
 234             !uctxt)
 235                 return -EINVAL;
 236 
 237         switch (cmd) {
 238         case HFI1_IOCTL_ASSIGN_CTXT:
 239                 ret = assign_ctxt(fd, arg, _IOC_SIZE(cmd));
 240                 break;
 241 
 242         case HFI1_IOCTL_CTXT_INFO:
 243                 ret = get_ctxt_info(fd, arg, _IOC_SIZE(cmd));
 244                 break;
 245 
 246         case HFI1_IOCTL_USER_INFO:
 247                 ret = get_base_info(fd, arg, _IOC_SIZE(cmd));
 248                 break;
 249 
 250         case HFI1_IOCTL_CREDIT_UPD:
 251                 if (uctxt)
 252                         sc_return_credits(uctxt->sc);
 253                 break;
 254 
 255         case HFI1_IOCTL_TID_UPDATE:
 256                 ret = user_exp_rcv_setup(fd, arg, _IOC_SIZE(cmd));
 257                 break;
 258 
 259         case HFI1_IOCTL_TID_FREE:
 260                 ret = user_exp_rcv_clear(fd, arg, _IOC_SIZE(cmd));
 261                 break;
 262 
 263         case HFI1_IOCTL_TID_INVAL_READ:
 264                 ret = user_exp_rcv_invalid(fd, arg, _IOC_SIZE(cmd));
 265                 break;
 266 
 267         case HFI1_IOCTL_RECV_CTRL:
 268                 ret = manage_rcvq(uctxt, fd->subctxt, arg);
 269                 break;
 270 
 271         case HFI1_IOCTL_POLL_TYPE:
 272                 if (get_user(uval, (int __user *)arg))
 273                         return -EFAULT;
 274                 uctxt->poll_type = (typeof(uctxt->poll_type))uval;
 275                 break;
 276 
 277         case HFI1_IOCTL_ACK_EVENT:
 278                 ret = user_event_ack(uctxt, fd->subctxt, arg);
 279                 break;
 280 
 281         case HFI1_IOCTL_SET_PKEY:
 282                 ret = set_ctxt_pkey(uctxt, arg);
 283                 break;
 284 
 285         case HFI1_IOCTL_CTXT_RESET:
 286                 ret = ctxt_reset(uctxt);
 287                 break;
 288 
 289         case HFI1_IOCTL_GET_VERS:
 290                 uval = HFI1_USER_SWVERSION;
 291                 if (put_user(uval, (int __user *)arg))
 292                         return -EFAULT;
 293                 break;
 294 
 295         default:
 296                 return -EINVAL;
 297         }
 298 
 299         return ret;
 300 }
 301 
 302 static ssize_t hfi1_write_iter(struct kiocb *kiocb, struct iov_iter *from)
 303 {
 304         struct hfi1_filedata *fd = kiocb->ki_filp->private_data;
 305         struct hfi1_user_sdma_pkt_q *pq;
 306         struct hfi1_user_sdma_comp_q *cq = fd->cq;
 307         int done = 0, reqs = 0;
 308         unsigned long dim = from->nr_segs;
 309         int idx;
 310 
 311         idx = srcu_read_lock(&fd->pq_srcu);
 312         pq = srcu_dereference(fd->pq, &fd->pq_srcu);
 313         if (!cq || !pq) {
 314                 srcu_read_unlock(&fd->pq_srcu, idx);
 315                 return -EIO;
 316         }
 317 
 318         if (!iter_is_iovec(from) || !dim) {
 319                 srcu_read_unlock(&fd->pq_srcu, idx);
 320                 return -EINVAL;
 321         }
 322 
 323         trace_hfi1_sdma_request(fd->dd, fd->uctxt->ctxt, fd->subctxt, dim);
 324 
 325         if (atomic_read(&pq->n_reqs) == pq->n_max_reqs) {
 326                 srcu_read_unlock(&fd->pq_srcu, idx);
 327                 return -ENOSPC;
 328         }
 329 
 330         while (dim) {
 331                 int ret;
 332                 unsigned long count = 0;
 333 
 334                 ret = hfi1_user_sdma_process_request(
 335                         fd, (struct iovec *)(from->iov + done),
 336                         dim, &count);
 337                 if (ret) {
 338                         reqs = ret;
 339                         break;
 340                 }
 341                 dim -= count;
 342                 done += count;
 343                 reqs++;
 344         }
 345 
 346         srcu_read_unlock(&fd->pq_srcu, idx);
 347         return reqs;
 348 }
 349 
 350 static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
 351 {
 352         struct hfi1_filedata *fd = fp->private_data;
 353         struct hfi1_ctxtdata *uctxt = fd->uctxt;
 354         struct hfi1_devdata *dd;
 355         unsigned long flags;
 356         u64 token = vma->vm_pgoff << PAGE_SHIFT,
 357                 memaddr = 0;
 358         void *memvirt = NULL;
 359         u8 subctxt, mapio = 0, vmf = 0, type;
 360         ssize_t memlen = 0;
 361         int ret = 0;
 362         u16 ctxt;
 363 
 364         if (!is_valid_mmap(token) || !uctxt ||
 365             !(vma->vm_flags & VM_SHARED)) {
 366                 ret = -EINVAL;
 367                 goto done;
 368         }
 369         dd = uctxt->dd;
 370         ctxt = HFI1_MMAP_TOKEN_GET(CTXT, token);
 371         subctxt = HFI1_MMAP_TOKEN_GET(SUBCTXT, token);
 372         type = HFI1_MMAP_TOKEN_GET(TYPE, token);
 373         if (ctxt != uctxt->ctxt || subctxt != fd->subctxt) {
 374                 ret = -EINVAL;
 375                 goto done;
 376         }
 377 
 378         flags = vma->vm_flags;
 379 
 380         switch (type) {
 381         case PIO_BUFS:
 382         case PIO_BUFS_SOP:
 383                 memaddr = ((dd->physaddr + TXE_PIO_SEND) +
 384                                 /* chip pio base */
 385                            (uctxt->sc->hw_context * BIT(16))) +
 386                                 /* 64K PIO space / ctxt */
 387                         (type == PIO_BUFS_SOP ?
 388                                 (TXE_PIO_SIZE / 2) : 0); /* sop? */
 389                 /*
 390                  * Map only the amount allocated to the context, not the
 391                  * entire available context's PIO space.
 392                  */
 393                 memlen = PAGE_ALIGN(uctxt->sc->credits * PIO_BLOCK_SIZE);
 394                 flags &= ~VM_MAYREAD;
 395                 flags |= VM_DONTCOPY | VM_DONTEXPAND;
 396                 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 397                 mapio = 1;
 398                 break;
 399         case PIO_CRED:
 400                 if (flags & VM_WRITE) {
 401                         ret = -EPERM;
 402                         goto done;
 403                 }
 404                 /*
 405                  * The credit return location for this context could be on the
 406                  * second or third page allocated for credit returns (if number
 407                  * of enabled contexts > 64 and 128 respectively).
 408                  */
 409                 memvirt = dd->cr_base[uctxt->numa_id].va;
 410                 memaddr = virt_to_phys(memvirt) +
 411                         (((u64)uctxt->sc->hw_free -
 412                           (u64)dd->cr_base[uctxt->numa_id].va) & PAGE_MASK);
 413                 memlen = PAGE_SIZE;
 414                 flags &= ~VM_MAYWRITE;
 415                 flags |= VM_DONTCOPY | VM_DONTEXPAND;
 416                 /*
 417                  * The driver has already allocated memory for credit
 418                  * returns and programmed it into the chip. Has that
 419                  * memory been flagged as non-cached?
 420                  */
 421                 /* vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); */
 422                 mapio = 1;
 423                 break;
 424         case RCV_HDRQ:
 425                 memlen = rcvhdrq_size(uctxt);
 426                 memvirt = uctxt->rcvhdrq;
 427                 break;
 428         case RCV_EGRBUF: {
 429                 unsigned long addr;
 430                 int i;
 431                 /*
 432                  * The RcvEgr buffer need to be handled differently
 433                  * as multiple non-contiguous pages need to be mapped
 434                  * into the user process.
 435                  */
 436                 memlen = uctxt->egrbufs.size;
 437                 if ((vma->vm_end - vma->vm_start) != memlen) {
 438                         dd_dev_err(dd, "Eager buffer map size invalid (%lu != %lu)\n",
 439                                    (vma->vm_end - vma->vm_start), memlen);
 440                         ret = -EINVAL;
 441                         goto done;
 442                 }
 443                 if (vma->vm_flags & VM_WRITE) {
 444                         ret = -EPERM;
 445                         goto done;
 446                 }
 447                 vma->vm_flags &= ~VM_MAYWRITE;
 448                 addr = vma->vm_start;
 449                 for (i = 0 ; i < uctxt->egrbufs.numbufs; i++) {
 450                         memlen = uctxt->egrbufs.buffers[i].len;
 451                         memvirt = uctxt->egrbufs.buffers[i].addr;
 452                         ret = remap_pfn_range(
 453                                 vma, addr,
 454                                 /*
 455                                  * virt_to_pfn() does the same, but
 456                                  * it's not available on x86_64
 457                                  * when CONFIG_MMU is enabled.
 458                                  */
 459                                 PFN_DOWN(__pa(memvirt)),
 460                                 memlen,
 461                                 vma->vm_page_prot);
 462                         if (ret < 0)
 463                                 goto done;
 464                         addr += memlen;
 465                 }
 466                 ret = 0;
 467                 goto done;
 468         }
 469         case UREGS:
 470                 /*
 471                  * Map only the page that contains this context's user
 472                  * registers.
 473                  */
 474                 memaddr = (unsigned long)
 475                         (dd->physaddr + RXE_PER_CONTEXT_USER)
 476                         + (uctxt->ctxt * RXE_PER_CONTEXT_SIZE);
 477                 /*
 478                  * TidFlow table is on the same page as the rest of the
 479                  * user registers.
 480                  */
 481                 memlen = PAGE_SIZE;
 482                 flags |= VM_DONTCOPY | VM_DONTEXPAND;
 483                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 484                 mapio = 1;
 485                 break;
 486         case EVENTS:
 487                 /*
 488                  * Use the page where this context's flags are. User level
 489                  * knows where it's own bitmap is within the page.
 490                  */
 491                 memaddr = (unsigned long)
 492                         (dd->events + uctxt_offset(uctxt)) & PAGE_MASK;
 493                 memlen = PAGE_SIZE;
 494                 /*
 495                  * v3.7 removes VM_RESERVED but the effect is kept by
 496                  * using VM_IO.
 497                  */
 498                 flags |= VM_IO | VM_DONTEXPAND;
 499                 vmf = 1;
 500                 break;
 501         case STATUS:
 502                 if (flags & VM_WRITE) {
 503                         ret = -EPERM;
 504                         goto done;
 505                 }
 506                 memaddr = kvirt_to_phys((void *)dd->status);
 507                 memlen = PAGE_SIZE;
 508                 flags |= VM_IO | VM_DONTEXPAND;
 509                 break;
 510         case RTAIL:
 511                 if (!HFI1_CAP_IS_USET(DMA_RTAIL)) {
 512                         /*
 513                          * If the memory allocation failed, the context alloc
 514                          * also would have failed, so we would never get here
 515                          */
 516                         ret = -EINVAL;
 517                         goto done;
 518                 }
 519                 if ((flags & VM_WRITE) || !uctxt->rcvhdrtail_kvaddr) {
 520                         ret = -EPERM;
 521                         goto done;
 522                 }
 523                 memlen = PAGE_SIZE;
 524                 memvirt = (void *)uctxt->rcvhdrtail_kvaddr;
 525                 flags &= ~VM_MAYWRITE;
 526                 break;
 527         case SUBCTXT_UREGS:
 528                 memaddr = (u64)uctxt->subctxt_uregbase;
 529                 memlen = PAGE_SIZE;
 530                 flags |= VM_IO | VM_DONTEXPAND;
 531                 vmf = 1;
 532                 break;
 533         case SUBCTXT_RCV_HDRQ:
 534                 memaddr = (u64)uctxt->subctxt_rcvhdr_base;
 535                 memlen = rcvhdrq_size(uctxt) * uctxt->subctxt_cnt;
 536                 flags |= VM_IO | VM_DONTEXPAND;
 537                 vmf = 1;
 538                 break;
 539         case SUBCTXT_EGRBUF:
 540                 memaddr = (u64)uctxt->subctxt_rcvegrbuf;
 541                 memlen = uctxt->egrbufs.size * uctxt->subctxt_cnt;
 542                 flags |= VM_IO | VM_DONTEXPAND;
 543                 flags &= ~VM_MAYWRITE;
 544                 vmf = 1;
 545                 break;
 546         case SDMA_COMP: {
 547                 struct hfi1_user_sdma_comp_q *cq = fd->cq;
 548 
 549                 if (!cq) {
 550                         ret = -EFAULT;
 551                         goto done;
 552                 }
 553                 memaddr = (u64)cq->comps;
 554                 memlen = PAGE_ALIGN(sizeof(*cq->comps) * cq->nentries);
 555                 flags |= VM_IO | VM_DONTEXPAND;
 556                 vmf = 1;
 557                 break;
 558         }
 559         default:
 560                 ret = -EINVAL;
 561                 break;
 562         }
 563 
 564         if ((vma->vm_end - vma->vm_start) != memlen) {
 565                 hfi1_cdbg(PROC, "%u:%u Memory size mismatch %lu:%lu",
 566                           uctxt->ctxt, fd->subctxt,
 567                           (vma->vm_end - vma->vm_start), memlen);
 568                 ret = -EINVAL;
 569                 goto done;
 570         }
 571 
 572         vma->vm_flags = flags;
 573         hfi1_cdbg(PROC,
 574                   "%u:%u type:%u io/vf:%d/%d, addr:0x%llx, len:%lu(%lu), flags:0x%lx\n",
 575                     ctxt, subctxt, type, mapio, vmf, memaddr, memlen,
 576                     vma->vm_end - vma->vm_start, vma->vm_flags);
 577         if (vmf) {
 578                 vma->vm_pgoff = PFN_DOWN(memaddr);
 579                 vma->vm_ops = &vm_ops;
 580                 ret = 0;
 581         } else if (mapio) {
 582                 ret = io_remap_pfn_range(vma, vma->vm_start,
 583                                          PFN_DOWN(memaddr),
 584                                          memlen,
 585                                          vma->vm_page_prot);
 586         } else if (memvirt) {
 587                 ret = remap_pfn_range(vma, vma->vm_start,
 588                                       PFN_DOWN(__pa(memvirt)),
 589                                       memlen,
 590                                       vma->vm_page_prot);
 591         } else {
 592                 ret = remap_pfn_range(vma, vma->vm_start,
 593                                       PFN_DOWN(memaddr),
 594                                       memlen,
 595                                       vma->vm_page_prot);
 596         }
 597 done:
 598         return ret;
 599 }
 600 
 601 /*
 602  * Local (non-chip) user memory is not mapped right away but as it is
 603  * accessed by the user-level code.
 604  */
 605 static vm_fault_t vma_fault(struct vm_fault *vmf)
 606 {
 607         struct page *page;
 608 
 609         page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT));
 610         if (!page)
 611                 return VM_FAULT_SIGBUS;
 612 
 613         get_page(page);
 614         vmf->page = page;
 615 
 616         return 0;
 617 }
 618 
 619 static __poll_t hfi1_poll(struct file *fp, struct poll_table_struct *pt)
 620 {
 621         struct hfi1_ctxtdata *uctxt;
 622         __poll_t pollflag;
 623 
 624         uctxt = ((struct hfi1_filedata *)fp->private_data)->uctxt;
 625         if (!uctxt)
 626                 pollflag = EPOLLERR;
 627         else if (uctxt->poll_type == HFI1_POLL_TYPE_URGENT)
 628                 pollflag = poll_urgent(fp, pt);
 629         else  if (uctxt->poll_type == HFI1_POLL_TYPE_ANYRCV)
 630                 pollflag = poll_next(fp, pt);
 631         else /* invalid */
 632                 pollflag = EPOLLERR;
 633 
 634         return pollflag;
 635 }
 636 
 637 static int hfi1_file_close(struct inode *inode, struct file *fp)
 638 {
 639         struct hfi1_filedata *fdata = fp->private_data;
 640         struct hfi1_ctxtdata *uctxt = fdata->uctxt;
 641         struct hfi1_devdata *dd = container_of(inode->i_cdev,
 642                                                struct hfi1_devdata,
 643                                                user_cdev);
 644         unsigned long flags, *ev;
 645 
 646         fp->private_data = NULL;
 647 
 648         if (!uctxt)
 649                 goto done;
 650 
 651         hfi1_cdbg(PROC, "closing ctxt %u:%u", uctxt->ctxt, fdata->subctxt);
 652 
 653         flush_wc();
 654         /* drain user sdma queue */
 655         hfi1_user_sdma_free_queues(fdata, uctxt);
 656 
 657         /* release the cpu */
 658         hfi1_put_proc_affinity(fdata->rec_cpu_num);
 659 
 660         /* clean up rcv side */
 661         hfi1_user_exp_rcv_free(fdata);
 662 
 663         /*
 664          * fdata->uctxt is used in the above cleanup.  It is not ready to be
 665          * removed until here.
 666          */
 667         fdata->uctxt = NULL;
 668         hfi1_rcd_put(uctxt);
 669 
 670         /*
 671          * Clear any left over, unhandled events so the next process that
 672          * gets this context doesn't get confused.
 673          */
 674         ev = dd->events + uctxt_offset(uctxt) + fdata->subctxt;
 675         *ev = 0;
 676 
 677         spin_lock_irqsave(&dd->uctxt_lock, flags);
 678         __clear_bit(fdata->subctxt, uctxt->in_use_ctxts);
 679         if (!bitmap_empty(uctxt->in_use_ctxts, HFI1_MAX_SHARED_CTXTS)) {
 680                 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 681                 goto done;
 682         }
 683         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 684 
 685         /*
 686          * Disable receive context and interrupt available, reset all
 687          * RcvCtxtCtrl bits to default values.
 688          */
 689         hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_DIS |
 690                      HFI1_RCVCTRL_TIDFLOW_DIS |
 691                      HFI1_RCVCTRL_INTRAVAIL_DIS |
 692                      HFI1_RCVCTRL_TAILUPD_DIS |
 693                      HFI1_RCVCTRL_ONE_PKT_EGR_DIS |
 694                      HFI1_RCVCTRL_NO_RHQ_DROP_DIS |
 695                      HFI1_RCVCTRL_NO_EGR_DROP_DIS |
 696                      HFI1_RCVCTRL_URGENT_DIS, uctxt);
 697         /* Clear the context's J_KEY */
 698         hfi1_clear_ctxt_jkey(dd, uctxt);
 699         /*
 700          * If a send context is allocated, reset context integrity
 701          * checks to default and disable the send context.
 702          */
 703         if (uctxt->sc) {
 704                 sc_disable(uctxt->sc);
 705                 set_pio_integrity(uctxt->sc);
 706         }
 707 
 708         hfi1_free_ctxt_rcv_groups(uctxt);
 709         hfi1_clear_ctxt_pkey(dd, uctxt);
 710 
 711         uctxt->event_flags = 0;
 712 
 713         deallocate_ctxt(uctxt);
 714 done:
 715         mmdrop(fdata->mm);
 716         kobject_put(&dd->kobj);
 717 
 718         if (atomic_dec_and_test(&dd->user_refcount))
 719                 complete(&dd->user_comp);
 720 
 721         cleanup_srcu_struct(&fdata->pq_srcu);
 722         kfree(fdata);
 723         return 0;
 724 }
 725 
 726 /*
 727  * Convert kernel *virtual* addresses to physical addresses.
 728  * This is used to vmalloc'ed addresses.
 729  */
 730 static u64 kvirt_to_phys(void *addr)
 731 {
 732         struct page *page;
 733         u64 paddr = 0;
 734 
 735         page = vmalloc_to_page(addr);
 736         if (page)
 737                 paddr = page_to_pfn(page) << PAGE_SHIFT;
 738 
 739         return paddr;
 740 }
 741 
 742 /**
 743  * complete_subctxt
 744  * @fd: valid filedata pointer
 745  *
 746  * Sub-context info can only be set up after the base context
 747  * has been completed.  This is indicated by the clearing of the
 748  * HFI1_CTXT_BASE_UINIT bit.
 749  *
 750  * Wait for the bit to be cleared, and then complete the subcontext
 751  * initialization.
 752  *
 753  */
 754 static int complete_subctxt(struct hfi1_filedata *fd)
 755 {
 756         int ret;
 757         unsigned long flags;
 758 
 759         /*
 760          * sub-context info can only be set up after the base context
 761          * has been completed.
 762          */
 763         ret = wait_event_interruptible(
 764                 fd->uctxt->wait,
 765                 !test_bit(HFI1_CTXT_BASE_UNINIT, &fd->uctxt->event_flags));
 766 
 767         if (test_bit(HFI1_CTXT_BASE_FAILED, &fd->uctxt->event_flags))
 768                 ret = -ENOMEM;
 769 
 770         /* Finish the sub-context init */
 771         if (!ret) {
 772                 fd->rec_cpu_num = hfi1_get_proc_affinity(fd->uctxt->numa_id);
 773                 ret = init_user_ctxt(fd, fd->uctxt);
 774         }
 775 
 776         if (ret) {
 777                 spin_lock_irqsave(&fd->dd->uctxt_lock, flags);
 778                 __clear_bit(fd->subctxt, fd->uctxt->in_use_ctxts);
 779                 spin_unlock_irqrestore(&fd->dd->uctxt_lock, flags);
 780                 hfi1_rcd_put(fd->uctxt);
 781                 fd->uctxt = NULL;
 782         }
 783 
 784         return ret;
 785 }
 786 
 787 static int assign_ctxt(struct hfi1_filedata *fd, unsigned long arg, u32 len)
 788 {
 789         int ret;
 790         unsigned int swmajor;
 791         struct hfi1_ctxtdata *uctxt = NULL;
 792         struct hfi1_user_info uinfo;
 793 
 794         if (fd->uctxt)
 795                 return -EINVAL;
 796 
 797         if (sizeof(uinfo) != len)
 798                 return -EINVAL;
 799 
 800         if (copy_from_user(&uinfo, (void __user *)arg, sizeof(uinfo)))
 801                 return -EFAULT;
 802 
 803         swmajor = uinfo.userversion >> 16;
 804         if (swmajor != HFI1_USER_SWMAJOR)
 805                 return -ENODEV;
 806 
 807         if (uinfo.subctxt_cnt > HFI1_MAX_SHARED_CTXTS)
 808                 return -EINVAL;
 809 
 810         /*
 811          * Acquire the mutex to protect against multiple creations of what
 812          * could be a shared base context.
 813          */
 814         mutex_lock(&hfi1_mutex);
 815         /*
 816          * Get a sub context if available  (fd->uctxt will be set).
 817          * ret < 0 error, 0 no context, 1 sub-context found
 818          */
 819         ret = find_sub_ctxt(fd, &uinfo);
 820 
 821         /*
 822          * Allocate a base context if context sharing is not required or a
 823          * sub context wasn't found.
 824          */
 825         if (!ret)
 826                 ret = allocate_ctxt(fd, fd->dd, &uinfo, &uctxt);
 827 
 828         mutex_unlock(&hfi1_mutex);
 829 
 830         /* Depending on the context type, finish the appropriate init */
 831         switch (ret) {
 832         case 0:
 833                 ret = setup_base_ctxt(fd, uctxt);
 834                 if (ret)
 835                         deallocate_ctxt(uctxt);
 836                 break;
 837         case 1:
 838                 ret = complete_subctxt(fd);
 839                 break;
 840         default:
 841                 break;
 842         }
 843 
 844         return ret;
 845 }
 846 
 847 /**
 848  * match_ctxt
 849  * @fd: valid filedata pointer
 850  * @uinfo: user info to compare base context with
 851  * @uctxt: context to compare uinfo to.
 852  *
 853  * Compare the given context with the given information to see if it
 854  * can be used for a sub context.
 855  */
 856 static int match_ctxt(struct hfi1_filedata *fd,
 857                       const struct hfi1_user_info *uinfo,
 858                       struct hfi1_ctxtdata *uctxt)
 859 {
 860         struct hfi1_devdata *dd = fd->dd;
 861         unsigned long flags;
 862         u16 subctxt;
 863 
 864         /* Skip dynamically allocated kernel contexts */
 865         if (uctxt->sc && (uctxt->sc->type == SC_KERNEL))
 866                 return 0;
 867 
 868         /* Skip ctxt if it doesn't match the requested one */
 869         if (memcmp(uctxt->uuid, uinfo->uuid, sizeof(uctxt->uuid)) ||
 870             uctxt->jkey != generate_jkey(current_uid()) ||
 871             uctxt->subctxt_id != uinfo->subctxt_id ||
 872             uctxt->subctxt_cnt != uinfo->subctxt_cnt)
 873                 return 0;
 874 
 875         /* Verify the sharing process matches the base */
 876         if (uctxt->userversion != uinfo->userversion)
 877                 return -EINVAL;
 878 
 879         /* Find an unused sub context */
 880         spin_lock_irqsave(&dd->uctxt_lock, flags);
 881         if (bitmap_empty(uctxt->in_use_ctxts, HFI1_MAX_SHARED_CTXTS)) {
 882                 /* context is being closed, do not use */
 883                 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 884                 return 0;
 885         }
 886 
 887         subctxt = find_first_zero_bit(uctxt->in_use_ctxts,
 888                                       HFI1_MAX_SHARED_CTXTS);
 889         if (subctxt >= uctxt->subctxt_cnt) {
 890                 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 891                 return -EBUSY;
 892         }
 893 
 894         fd->subctxt = subctxt;
 895         __set_bit(fd->subctxt, uctxt->in_use_ctxts);
 896         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 897 
 898         fd->uctxt = uctxt;
 899         hfi1_rcd_get(uctxt);
 900 
 901         return 1;
 902 }
 903 
 904 /**
 905  * find_sub_ctxt
 906  * @fd: valid filedata pointer
 907  * @uinfo: matching info to use to find a possible context to share.
 908  *
 909  * The hfi1_mutex must be held when this function is called.  It is
 910  * necessary to ensure serialized creation of shared contexts.
 911  *
 912  * Return:
 913  *    0      No sub-context found
 914  *    1      Subcontext found and allocated
 915  *    errno  EINVAL (incorrect parameters)
 916  *           EBUSY (all sub contexts in use)
 917  */
 918 static int find_sub_ctxt(struct hfi1_filedata *fd,
 919                          const struct hfi1_user_info *uinfo)
 920 {
 921         struct hfi1_ctxtdata *uctxt;
 922         struct hfi1_devdata *dd = fd->dd;
 923         u16 i;
 924         int ret;
 925 
 926         if (!uinfo->subctxt_cnt)
 927                 return 0;
 928 
 929         for (i = dd->first_dyn_alloc_ctxt; i < dd->num_rcv_contexts; i++) {
 930                 uctxt = hfi1_rcd_get_by_index(dd, i);
 931                 if (uctxt) {
 932                         ret = match_ctxt(fd, uinfo, uctxt);
 933                         hfi1_rcd_put(uctxt);
 934                         /* value of != 0 will return */
 935                         if (ret)
 936                                 return ret;
 937                 }
 938         }
 939 
 940         return 0;
 941 }
 942 
 943 static int allocate_ctxt(struct hfi1_filedata *fd, struct hfi1_devdata *dd,
 944                          struct hfi1_user_info *uinfo,
 945                          struct hfi1_ctxtdata **rcd)
 946 {
 947         struct hfi1_ctxtdata *uctxt;
 948         int ret, numa;
 949 
 950         if (dd->flags & HFI1_FROZEN) {
 951                 /*
 952                  * Pick an error that is unique from all other errors
 953                  * that are returned so the user process knows that
 954                  * it tried to allocate while the SPC was frozen.  It
 955                  * it should be able to retry with success in a short
 956                  * while.
 957                  */
 958                 return -EIO;
 959         }
 960 
 961         if (!dd->freectxts)
 962                 return -EBUSY;
 963 
 964         /*
 965          * If we don't have a NUMA node requested, preference is towards
 966          * device NUMA node.
 967          */
 968         fd->rec_cpu_num = hfi1_get_proc_affinity(dd->node);
 969         if (fd->rec_cpu_num != -1)
 970                 numa = cpu_to_node(fd->rec_cpu_num);
 971         else
 972                 numa = numa_node_id();
 973         ret = hfi1_create_ctxtdata(dd->pport, numa, &uctxt);
 974         if (ret < 0) {
 975                 dd_dev_err(dd, "user ctxtdata allocation failed\n");
 976                 return ret;
 977         }
 978         hfi1_cdbg(PROC, "[%u:%u] pid %u assigned to CPU %d (NUMA %u)",
 979                   uctxt->ctxt, fd->subctxt, current->pid, fd->rec_cpu_num,
 980                   uctxt->numa_id);
 981 
 982         /*
 983          * Allocate and enable a PIO send context.
 984          */
 985         uctxt->sc = sc_alloc(dd, SC_USER, uctxt->rcvhdrqentsize, dd->node);
 986         if (!uctxt->sc) {
 987                 ret = -ENOMEM;
 988                 goto ctxdata_free;
 989         }
 990         hfi1_cdbg(PROC, "allocated send context %u(%u)\n", uctxt->sc->sw_index,
 991                   uctxt->sc->hw_context);
 992         ret = sc_enable(uctxt->sc);
 993         if (ret)
 994                 goto ctxdata_free;
 995 
 996         /*
 997          * Setup sub context information if the user-level has requested
 998          * sub contexts.
 999          * This has to be done here so the rest of the sub-contexts find the
1000          * proper base context.
1001          * NOTE: _set_bit() can be used here because the context creation is
1002          * protected by the mutex (rather than the spin_lock), and will be the
1003          * very first instance of this context.
1004          */
1005         __set_bit(0, uctxt->in_use_ctxts);
1006         if (uinfo->subctxt_cnt)
1007                 init_subctxts(uctxt, uinfo);
1008         uctxt->userversion = uinfo->userversion;
1009         uctxt->flags = hfi1_cap_mask; /* save current flag state */
1010         init_waitqueue_head(&uctxt->wait);
1011         strlcpy(uctxt->comm, current->comm, sizeof(uctxt->comm));
1012         memcpy(uctxt->uuid, uinfo->uuid, sizeof(uctxt->uuid));
1013         uctxt->jkey = generate_jkey(current_uid());
1014         hfi1_stats.sps_ctxts++;
1015         /*
1016          * Disable ASPM when there are open user/PSM contexts to avoid
1017          * issues with ASPM L1 exit latency
1018          */
1019         if (dd->freectxts-- == dd->num_user_contexts)
1020                 aspm_disable_all(dd);
1021 
1022         *rcd = uctxt;
1023 
1024         return 0;
1025 
1026 ctxdata_free:
1027         hfi1_free_ctxt(uctxt);
1028         return ret;
1029 }
1030 
1031 static void deallocate_ctxt(struct hfi1_ctxtdata *uctxt)
1032 {
1033         mutex_lock(&hfi1_mutex);
1034         hfi1_stats.sps_ctxts--;
1035         if (++uctxt->dd->freectxts == uctxt->dd->num_user_contexts)
1036                 aspm_enable_all(uctxt->dd);
1037         mutex_unlock(&hfi1_mutex);
1038 
1039         hfi1_free_ctxt(uctxt);
1040 }
1041 
1042 static void init_subctxts(struct hfi1_ctxtdata *uctxt,
1043                           const struct hfi1_user_info *uinfo)
1044 {
1045         uctxt->subctxt_cnt = uinfo->subctxt_cnt;
1046         uctxt->subctxt_id = uinfo->subctxt_id;
1047         set_bit(HFI1_CTXT_BASE_UNINIT, &uctxt->event_flags);
1048 }
1049 
1050 static int setup_subctxt(struct hfi1_ctxtdata *uctxt)
1051 {
1052         int ret = 0;
1053         u16 num_subctxts = uctxt->subctxt_cnt;
1054 
1055         uctxt->subctxt_uregbase = vmalloc_user(PAGE_SIZE);
1056         if (!uctxt->subctxt_uregbase)
1057                 return -ENOMEM;
1058 
1059         /* We can take the size of the RcvHdr Queue from the master */
1060         uctxt->subctxt_rcvhdr_base = vmalloc_user(rcvhdrq_size(uctxt) *
1061                                                   num_subctxts);
1062         if (!uctxt->subctxt_rcvhdr_base) {
1063                 ret = -ENOMEM;
1064                 goto bail_ureg;
1065         }
1066 
1067         uctxt->subctxt_rcvegrbuf = vmalloc_user(uctxt->egrbufs.size *
1068                                                 num_subctxts);
1069         if (!uctxt->subctxt_rcvegrbuf) {
1070                 ret = -ENOMEM;
1071                 goto bail_rhdr;
1072         }
1073 
1074         return 0;
1075 
1076 bail_rhdr:
1077         vfree(uctxt->subctxt_rcvhdr_base);
1078         uctxt->subctxt_rcvhdr_base = NULL;
1079 bail_ureg:
1080         vfree(uctxt->subctxt_uregbase);
1081         uctxt->subctxt_uregbase = NULL;
1082 
1083         return ret;
1084 }
1085 
1086 static void user_init(struct hfi1_ctxtdata *uctxt)
1087 {
1088         unsigned int rcvctrl_ops = 0;
1089 
1090         /* initialize poll variables... */
1091         uctxt->urgent = 0;
1092         uctxt->urgent_poll = 0;
1093 
1094         /*
1095          * Now enable the ctxt for receive.
1096          * For chips that are set to DMA the tail register to memory
1097          * when they change (and when the update bit transitions from
1098          * 0 to 1.  So for those chips, we turn it off and then back on.
1099          * This will (very briefly) affect any other open ctxts, but the
1100          * duration is very short, and therefore isn't an issue.  We
1101          * explicitly set the in-memory tail copy to 0 beforehand, so we
1102          * don't have to wait to be sure the DMA update has happened
1103          * (chip resets head/tail to 0 on transition to enable).
1104          */
1105         if (uctxt->rcvhdrtail_kvaddr)
1106                 clear_rcvhdrtail(uctxt);
1107 
1108         /* Setup J_KEY before enabling the context */
1109         hfi1_set_ctxt_jkey(uctxt->dd, uctxt, uctxt->jkey);
1110 
1111         rcvctrl_ops = HFI1_RCVCTRL_CTXT_ENB;
1112         rcvctrl_ops |= HFI1_RCVCTRL_URGENT_ENB;
1113         if (HFI1_CAP_UGET_MASK(uctxt->flags, HDRSUPP))
1114                 rcvctrl_ops |= HFI1_RCVCTRL_TIDFLOW_ENB;
1115         /*
1116          * Ignore the bit in the flags for now until proper
1117          * support for multiple packet per rcv array entry is
1118          * added.
1119          */
1120         if (!HFI1_CAP_UGET_MASK(uctxt->flags, MULTI_PKT_EGR))
1121                 rcvctrl_ops |= HFI1_RCVCTRL_ONE_PKT_EGR_ENB;
1122         if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_EGR_FULL))
1123                 rcvctrl_ops |= HFI1_RCVCTRL_NO_EGR_DROP_ENB;
1124         if (HFI1_CAP_UGET_MASK(uctxt->flags, NODROP_RHQ_FULL))
1125                 rcvctrl_ops |= HFI1_RCVCTRL_NO_RHQ_DROP_ENB;
1126         /*
1127          * The RcvCtxtCtrl.TailUpd bit has to be explicitly written.
1128          * We can't rely on the correct value to be set from prior
1129          * uses of the chip or ctxt. Therefore, add the rcvctrl op
1130          * for both cases.
1131          */
1132         if (HFI1_CAP_UGET_MASK(uctxt->flags, DMA_RTAIL))
1133                 rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_ENB;
1134         else
1135                 rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_DIS;
1136         hfi1_rcvctrl(uctxt->dd, rcvctrl_ops, uctxt);
1137 }
1138 
1139 static int get_ctxt_info(struct hfi1_filedata *fd, unsigned long arg, u32 len)
1140 {
1141         struct hfi1_ctxt_info cinfo;
1142         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1143 
1144         if (sizeof(cinfo) != len)
1145                 return -EINVAL;
1146 
1147         memset(&cinfo, 0, sizeof(cinfo));
1148         cinfo.runtime_flags = (((uctxt->flags >> HFI1_CAP_MISC_SHIFT) &
1149                                 HFI1_CAP_MISC_MASK) << HFI1_CAP_USER_SHIFT) |
1150                         HFI1_CAP_UGET_MASK(uctxt->flags, MASK) |
1151                         HFI1_CAP_KGET_MASK(uctxt->flags, K2U);
1152         /* adjust flag if this fd is not able to cache */
1153         if (!fd->handler)
1154                 cinfo.runtime_flags |= HFI1_CAP_TID_UNMAP; /* no caching */
1155 
1156         cinfo.num_active = hfi1_count_active_units();
1157         cinfo.unit = uctxt->dd->unit;
1158         cinfo.ctxt = uctxt->ctxt;
1159         cinfo.subctxt = fd->subctxt;
1160         cinfo.rcvtids = roundup(uctxt->egrbufs.alloced,
1161                                 uctxt->dd->rcv_entries.group_size) +
1162                 uctxt->expected_count;
1163         cinfo.credits = uctxt->sc->credits;
1164         cinfo.numa_node = uctxt->numa_id;
1165         cinfo.rec_cpu = fd->rec_cpu_num;
1166         cinfo.send_ctxt = uctxt->sc->hw_context;
1167 
1168         cinfo.egrtids = uctxt->egrbufs.alloced;
1169         cinfo.rcvhdrq_cnt = uctxt->rcvhdrq_cnt;
1170         cinfo.rcvhdrq_entsize = uctxt->rcvhdrqentsize << 2;
1171         cinfo.sdma_ring_size = fd->cq->nentries;
1172         cinfo.rcvegr_size = uctxt->egrbufs.rcvtid_size;
1173 
1174         trace_hfi1_ctxt_info(uctxt->dd, uctxt->ctxt, fd->subctxt, &cinfo);
1175         if (copy_to_user((void __user *)arg, &cinfo, len))
1176                 return -EFAULT;
1177 
1178         return 0;
1179 }
1180 
1181 static int init_user_ctxt(struct hfi1_filedata *fd,
1182                           struct hfi1_ctxtdata *uctxt)
1183 {
1184         int ret;
1185 
1186         ret = hfi1_user_sdma_alloc_queues(uctxt, fd);
1187         if (ret)
1188                 return ret;
1189 
1190         ret = hfi1_user_exp_rcv_init(fd, uctxt);
1191         if (ret)
1192                 hfi1_user_sdma_free_queues(fd, uctxt);
1193 
1194         return ret;
1195 }
1196 
1197 static int setup_base_ctxt(struct hfi1_filedata *fd,
1198                            struct hfi1_ctxtdata *uctxt)
1199 {
1200         struct hfi1_devdata *dd = uctxt->dd;
1201         int ret = 0;
1202 
1203         hfi1_init_ctxt(uctxt->sc);
1204 
1205         /* Now allocate the RcvHdr queue and eager buffers. */
1206         ret = hfi1_create_rcvhdrq(dd, uctxt);
1207         if (ret)
1208                 goto done;
1209 
1210         ret = hfi1_setup_eagerbufs(uctxt);
1211         if (ret)
1212                 goto done;
1213 
1214         /* If sub-contexts are enabled, do the appropriate setup */
1215         if (uctxt->subctxt_cnt)
1216                 ret = setup_subctxt(uctxt);
1217         if (ret)
1218                 goto done;
1219 
1220         ret = hfi1_alloc_ctxt_rcv_groups(uctxt);
1221         if (ret)
1222                 goto done;
1223 
1224         ret = init_user_ctxt(fd, uctxt);
1225         if (ret)
1226                 goto done;
1227 
1228         user_init(uctxt);
1229 
1230         /* Now that the context is set up, the fd can get a reference. */
1231         fd->uctxt = uctxt;
1232         hfi1_rcd_get(uctxt);
1233 
1234 done:
1235         if (uctxt->subctxt_cnt) {
1236                 /*
1237                  * On error, set the failed bit so sub-contexts will clean up
1238                  * correctly.
1239                  */
1240                 if (ret)
1241                         set_bit(HFI1_CTXT_BASE_FAILED, &uctxt->event_flags);
1242 
1243                 /*
1244                  * Base context is done (successfully or not), notify anybody
1245                  * using a sub-context that is waiting for this completion.
1246                  */
1247                 clear_bit(HFI1_CTXT_BASE_UNINIT, &uctxt->event_flags);
1248                 wake_up(&uctxt->wait);
1249         }
1250 
1251         return ret;
1252 }
1253 
1254 static int get_base_info(struct hfi1_filedata *fd, unsigned long arg, u32 len)
1255 {
1256         struct hfi1_base_info binfo;
1257         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1258         struct hfi1_devdata *dd = uctxt->dd;
1259         unsigned offset;
1260 
1261         trace_hfi1_uctxtdata(uctxt->dd, uctxt, fd->subctxt);
1262 
1263         if (sizeof(binfo) != len)
1264                 return -EINVAL;
1265 
1266         memset(&binfo, 0, sizeof(binfo));
1267         binfo.hw_version = dd->revision;
1268         binfo.sw_version = HFI1_KERN_SWVERSION;
1269         binfo.bthqp = kdeth_qp;
1270         binfo.jkey = uctxt->jkey;
1271         /*
1272          * If more than 64 contexts are enabled the allocated credit
1273          * return will span two or three contiguous pages. Since we only
1274          * map the page containing the context's credit return address,
1275          * we need to calculate the offset in the proper page.
1276          */
1277         offset = ((u64)uctxt->sc->hw_free -
1278                   (u64)dd->cr_base[uctxt->numa_id].va) % PAGE_SIZE;
1279         binfo.sc_credits_addr = HFI1_MMAP_TOKEN(PIO_CRED, uctxt->ctxt,
1280                                                 fd->subctxt, offset);
1281         binfo.pio_bufbase = HFI1_MMAP_TOKEN(PIO_BUFS, uctxt->ctxt,
1282                                             fd->subctxt,
1283                                             uctxt->sc->base_addr);
1284         binfo.pio_bufbase_sop = HFI1_MMAP_TOKEN(PIO_BUFS_SOP,
1285                                                 uctxt->ctxt,
1286                                                 fd->subctxt,
1287                                                 uctxt->sc->base_addr);
1288         binfo.rcvhdr_bufbase = HFI1_MMAP_TOKEN(RCV_HDRQ, uctxt->ctxt,
1289                                                fd->subctxt,
1290                                                uctxt->rcvhdrq);
1291         binfo.rcvegr_bufbase = HFI1_MMAP_TOKEN(RCV_EGRBUF, uctxt->ctxt,
1292                                                fd->subctxt,
1293                                                uctxt->egrbufs.rcvtids[0].dma);
1294         binfo.sdma_comp_bufbase = HFI1_MMAP_TOKEN(SDMA_COMP, uctxt->ctxt,
1295                                                   fd->subctxt, 0);
1296         /*
1297          * user regs are at
1298          * (RXE_PER_CONTEXT_USER + (ctxt * RXE_PER_CONTEXT_SIZE))
1299          */
1300         binfo.user_regbase = HFI1_MMAP_TOKEN(UREGS, uctxt->ctxt,
1301                                              fd->subctxt, 0);
1302         offset = offset_in_page((uctxt_offset(uctxt) + fd->subctxt) *
1303                                 sizeof(*dd->events));
1304         binfo.events_bufbase = HFI1_MMAP_TOKEN(EVENTS, uctxt->ctxt,
1305                                                fd->subctxt,
1306                                                offset);
1307         binfo.status_bufbase = HFI1_MMAP_TOKEN(STATUS, uctxt->ctxt,
1308                                                fd->subctxt,
1309                                                dd->status);
1310         if (HFI1_CAP_IS_USET(DMA_RTAIL))
1311                 binfo.rcvhdrtail_base = HFI1_MMAP_TOKEN(RTAIL, uctxt->ctxt,
1312                                                         fd->subctxt, 0);
1313         if (uctxt->subctxt_cnt) {
1314                 binfo.subctxt_uregbase = HFI1_MMAP_TOKEN(SUBCTXT_UREGS,
1315                                                          uctxt->ctxt,
1316                                                          fd->subctxt, 0);
1317                 binfo.subctxt_rcvhdrbuf = HFI1_MMAP_TOKEN(SUBCTXT_RCV_HDRQ,
1318                                                           uctxt->ctxt,
1319                                                           fd->subctxt, 0);
1320                 binfo.subctxt_rcvegrbuf = HFI1_MMAP_TOKEN(SUBCTXT_EGRBUF,
1321                                                           uctxt->ctxt,
1322                                                           fd->subctxt, 0);
1323         }
1324 
1325         if (copy_to_user((void __user *)arg, &binfo, len))
1326                 return -EFAULT;
1327 
1328         return 0;
1329 }
1330 
1331 /**
1332  * user_exp_rcv_setup - Set up the given tid rcv list
1333  * @fd: file data of the current driver instance
1334  * @arg: ioctl argumnent for user space information
1335  * @len: length of data structure associated with ioctl command
1336  *
1337  * Wrapper to validate ioctl information before doing _rcv_setup.
1338  *
1339  */
1340 static int user_exp_rcv_setup(struct hfi1_filedata *fd, unsigned long arg,
1341                               u32 len)
1342 {
1343         int ret;
1344         unsigned long addr;
1345         struct hfi1_tid_info tinfo;
1346 
1347         if (sizeof(tinfo) != len)
1348                 return -EINVAL;
1349 
1350         if (copy_from_user(&tinfo, (void __user *)arg, (sizeof(tinfo))))
1351                 return -EFAULT;
1352 
1353         ret = hfi1_user_exp_rcv_setup(fd, &tinfo);
1354         if (!ret) {
1355                 /*
1356                  * Copy the number of tidlist entries we used
1357                  * and the length of the buffer we registered.
1358                  */
1359                 addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
1360                 if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
1361                                  sizeof(tinfo.tidcnt)))
1362                         return -EFAULT;
1363 
1364                 addr = arg + offsetof(struct hfi1_tid_info, length);
1365                 if (copy_to_user((void __user *)addr, &tinfo.length,
1366                                  sizeof(tinfo.length)))
1367                         ret = -EFAULT;
1368         }
1369 
1370         return ret;
1371 }
1372 
1373 /**
1374  * user_exp_rcv_clear - Clear the given tid rcv list
1375  * @fd: file data of the current driver instance
1376  * @arg: ioctl argumnent for user space information
1377  * @len: length of data structure associated with ioctl command
1378  *
1379  * The hfi1_user_exp_rcv_clear() can be called from the error path.  Because
1380  * of this, we need to use this wrapper to copy the user space information
1381  * before doing the clear.
1382  */
1383 static int user_exp_rcv_clear(struct hfi1_filedata *fd, unsigned long arg,
1384                               u32 len)
1385 {
1386         int ret;
1387         unsigned long addr;
1388         struct hfi1_tid_info tinfo;
1389 
1390         if (sizeof(tinfo) != len)
1391                 return -EINVAL;
1392 
1393         if (copy_from_user(&tinfo, (void __user *)arg, (sizeof(tinfo))))
1394                 return -EFAULT;
1395 
1396         ret = hfi1_user_exp_rcv_clear(fd, &tinfo);
1397         if (!ret) {
1398                 addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
1399                 if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
1400                                  sizeof(tinfo.tidcnt)))
1401                         return -EFAULT;
1402         }
1403 
1404         return ret;
1405 }
1406 
1407 /**
1408  * user_exp_rcv_invalid - Invalidate the given tid rcv list
1409  * @fd: file data of the current driver instance
1410  * @arg: ioctl argumnent for user space information
1411  * @len: length of data structure associated with ioctl command
1412  *
1413  * Wrapper to validate ioctl information before doing _rcv_invalid.
1414  *
1415  */
1416 static int user_exp_rcv_invalid(struct hfi1_filedata *fd, unsigned long arg,
1417                                 u32 len)
1418 {
1419         int ret;
1420         unsigned long addr;
1421         struct hfi1_tid_info tinfo;
1422 
1423         if (sizeof(tinfo) != len)
1424                 return -EINVAL;
1425 
1426         if (!fd->invalid_tids)
1427                 return -EINVAL;
1428 
1429         if (copy_from_user(&tinfo, (void __user *)arg, (sizeof(tinfo))))
1430                 return -EFAULT;
1431 
1432         ret = hfi1_user_exp_rcv_invalid(fd, &tinfo);
1433         if (ret)
1434                 return ret;
1435 
1436         addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
1437         if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
1438                          sizeof(tinfo.tidcnt)))
1439                 ret = -EFAULT;
1440 
1441         return ret;
1442 }
1443 
1444 static __poll_t poll_urgent(struct file *fp,
1445                                 struct poll_table_struct *pt)
1446 {
1447         struct hfi1_filedata *fd = fp->private_data;
1448         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1449         struct hfi1_devdata *dd = uctxt->dd;
1450         __poll_t pollflag;
1451 
1452         poll_wait(fp, &uctxt->wait, pt);
1453 
1454         spin_lock_irq(&dd->uctxt_lock);
1455         if (uctxt->urgent != uctxt->urgent_poll) {
1456                 pollflag = EPOLLIN | EPOLLRDNORM;
1457                 uctxt->urgent_poll = uctxt->urgent;
1458         } else {
1459                 pollflag = 0;
1460                 set_bit(HFI1_CTXT_WAITING_URG, &uctxt->event_flags);
1461         }
1462         spin_unlock_irq(&dd->uctxt_lock);
1463 
1464         return pollflag;
1465 }
1466 
1467 static __poll_t poll_next(struct file *fp,
1468                               struct poll_table_struct *pt)
1469 {
1470         struct hfi1_filedata *fd = fp->private_data;
1471         struct hfi1_ctxtdata *uctxt = fd->uctxt;
1472         struct hfi1_devdata *dd = uctxt->dd;
1473         __poll_t pollflag;
1474 
1475         poll_wait(fp, &uctxt->wait, pt);
1476 
1477         spin_lock_irq(&dd->uctxt_lock);
1478         if (hdrqempty(uctxt)) {
1479                 set_bit(HFI1_CTXT_WAITING_RCV, &uctxt->event_flags);
1480                 hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_ENB, uctxt);
1481                 pollflag = 0;
1482         } else {
1483                 pollflag = EPOLLIN | EPOLLRDNORM;
1484         }
1485         spin_unlock_irq(&dd->uctxt_lock);
1486 
1487         return pollflag;
1488 }
1489 
1490 /*
1491  * Find all user contexts in use, and set the specified bit in their
1492  * event mask.
1493  * See also find_ctxt() for a similar use, that is specific to send buffers.
1494  */
1495 int hfi1_set_uevent_bits(struct hfi1_pportdata *ppd, const int evtbit)
1496 {
1497         struct hfi1_ctxtdata *uctxt;
1498         struct hfi1_devdata *dd = ppd->dd;
1499         u16 ctxt;
1500 
1501         if (!dd->events)
1502                 return -EINVAL;
1503 
1504         for (ctxt = dd->first_dyn_alloc_ctxt; ctxt < dd->num_rcv_contexts;
1505              ctxt++) {
1506                 uctxt = hfi1_rcd_get_by_index(dd, ctxt);
1507                 if (uctxt) {
1508                         unsigned long *evs;
1509                         int i;
1510                         /*
1511                          * subctxt_cnt is 0 if not shared, so do base
1512                          * separately, first, then remaining subctxt, if any
1513                          */
1514                         evs = dd->events + uctxt_offset(uctxt);
1515                         set_bit(evtbit, evs);
1516                         for (i = 1; i < uctxt->subctxt_cnt; i++)
1517                                 set_bit(evtbit, evs + i);
1518                         hfi1_rcd_put(uctxt);
1519                 }
1520         }
1521 
1522         return 0;
1523 }
1524 
1525 /**
1526  * manage_rcvq - manage a context's receive queue
1527  * @uctxt: the context
1528  * @subctxt: the sub-context
1529  * @start_stop: action to carry out
1530  *
1531  * start_stop == 0 disables receive on the context, for use in queue
1532  * overflow conditions.  start_stop==1 re-enables, to be used to
1533  * re-init the software copy of the head register
1534  */
1535 static int manage_rcvq(struct hfi1_ctxtdata *uctxt, u16 subctxt,
1536                        unsigned long arg)
1537 {
1538         struct hfi1_devdata *dd = uctxt->dd;
1539         unsigned int rcvctrl_op;
1540         int start_stop;
1541 
1542         if (subctxt)
1543                 return 0;
1544 
1545         if (get_user(start_stop, (int __user *)arg))
1546                 return -EFAULT;
1547 
1548         /* atomically clear receive enable ctxt. */
1549         if (start_stop) {
1550                 /*
1551                  * On enable, force in-memory copy of the tail register to
1552                  * 0, so that protocol code doesn't have to worry about
1553                  * whether or not the chip has yet updated the in-memory
1554                  * copy or not on return from the system call. The chip
1555                  * always resets it's tail register back to 0 on a
1556                  * transition from disabled to enabled.
1557                  */
1558                 if (uctxt->rcvhdrtail_kvaddr)
1559                         clear_rcvhdrtail(uctxt);
1560                 rcvctrl_op = HFI1_RCVCTRL_CTXT_ENB;
1561         } else {
1562                 rcvctrl_op = HFI1_RCVCTRL_CTXT_DIS;
1563         }
1564         hfi1_rcvctrl(dd, rcvctrl_op, uctxt);
1565         /* always; new head should be equal to new tail; see above */
1566 
1567         return 0;
1568 }
1569 
1570 /*
1571  * clear the event notifier events for this context.
1572  * User process then performs actions appropriate to bit having been
1573  * set, if desired, and checks again in future.
1574  */
1575 static int user_event_ack(struct hfi1_ctxtdata *uctxt, u16 subctxt,
1576                           unsigned long arg)
1577 {
1578         int i;
1579         struct hfi1_devdata *dd = uctxt->dd;
1580         unsigned long *evs;
1581         unsigned long events;
1582 
1583         if (!dd->events)
1584                 return 0;
1585 
1586         if (get_user(events, (unsigned long __user *)arg))
1587                 return -EFAULT;
1588 
1589         evs = dd->events + uctxt_offset(uctxt) + subctxt;
1590 
1591         for (i = 0; i <= _HFI1_MAX_EVENT_BIT; i++) {
1592                 if (!test_bit(i, &events))
1593                         continue;
1594                 clear_bit(i, evs);
1595         }
1596         return 0;
1597 }
1598 
1599 static int set_ctxt_pkey(struct hfi1_ctxtdata *uctxt, unsigned long arg)
1600 {
1601         int i;
1602         struct hfi1_pportdata *ppd = uctxt->ppd;
1603         struct hfi1_devdata *dd = uctxt->dd;
1604         u16 pkey;
1605 
1606         if (!HFI1_CAP_IS_USET(PKEY_CHECK))
1607                 return -EPERM;
1608 
1609         if (get_user(pkey, (u16 __user *)arg))
1610                 return -EFAULT;
1611 
1612         if (pkey == LIM_MGMT_P_KEY || pkey == FULL_MGMT_P_KEY)
1613                 return -EINVAL;
1614 
1615         for (i = 0; i < ARRAY_SIZE(ppd->pkeys); i++)
1616                 if (pkey == ppd->pkeys[i])
1617                         return hfi1_set_ctxt_pkey(dd, uctxt, pkey);
1618 
1619         return -ENOENT;
1620 }
1621 
1622 /**
1623  * ctxt_reset - Reset the user context
1624  * @uctxt: valid user context
1625  */
1626 static int ctxt_reset(struct hfi1_ctxtdata *uctxt)
1627 {
1628         struct send_context *sc;
1629         struct hfi1_devdata *dd;
1630         int ret = 0;
1631 
1632         if (!uctxt || !uctxt->dd || !uctxt->sc)
1633                 return -EINVAL;
1634 
1635         /*
1636          * There is no protection here. User level has to guarantee that
1637          * no one will be writing to the send context while it is being
1638          * re-initialized.  If user level breaks that guarantee, it will
1639          * break it's own context and no one else's.
1640          */
1641         dd = uctxt->dd;
1642         sc = uctxt->sc;
1643 
1644         /*
1645          * Wait until the interrupt handler has marked the context as
1646          * halted or frozen. Report error if we time out.
1647          */
1648         wait_event_interruptible_timeout(
1649                 sc->halt_wait, (sc->flags & SCF_HALTED),
1650                 msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
1651         if (!(sc->flags & SCF_HALTED))
1652                 return -ENOLCK;
1653 
1654         /*
1655          * If the send context was halted due to a Freeze, wait until the
1656          * device has been "unfrozen" before resetting the context.
1657          */
1658         if (sc->flags & SCF_FROZEN) {
1659                 wait_event_interruptible_timeout(
1660                         dd->event_queue,
1661                         !(READ_ONCE(dd->flags) & HFI1_FROZEN),
1662                         msecs_to_jiffies(SEND_CTXT_HALT_TIMEOUT));
1663                 if (dd->flags & HFI1_FROZEN)
1664                         return -ENOLCK;
1665 
1666                 if (dd->flags & HFI1_FORCED_FREEZE)
1667                         /*
1668                          * Don't allow context reset if we are into
1669                          * forced freeze
1670                          */
1671                         return -ENODEV;
1672 
1673                 sc_disable(sc);
1674                 ret = sc_enable(sc);
1675                 hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_ENB, uctxt);
1676         } else {
1677                 ret = sc_restart(sc);
1678         }
1679         if (!ret)
1680                 sc_return_credits(sc);
1681 
1682         return ret;
1683 }
1684 
1685 static void user_remove(struct hfi1_devdata *dd)
1686 {
1687 
1688         hfi1_cdev_cleanup(&dd->user_cdev, &dd->user_device);
1689 }
1690 
1691 static int user_add(struct hfi1_devdata *dd)
1692 {
1693         char name[10];
1694         int ret;
1695 
1696         snprintf(name, sizeof(name), "%s_%d", class_name(), dd->unit);
1697         ret = hfi1_cdev_init(dd->unit, name, &hfi1_file_ops,
1698                              &dd->user_cdev, &dd->user_device,
1699                              true, &dd->kobj);
1700         if (ret)
1701                 user_remove(dd);
1702 
1703         return ret;
1704 }
1705 
1706 /*
1707  * Create per-unit files in /dev
1708  */
1709 int hfi1_device_create(struct hfi1_devdata *dd)
1710 {
1711         return user_add(dd);
1712 }
1713 
1714 /*
1715  * Remove per-unit files in /dev
1716  * void, core kernel returns no errors for this stuff
1717  */
1718 void hfi1_device_remove(struct hfi1_devdata *dd)
1719 {
1720         user_remove(dd);
1721 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/infiniband/hw/hfi1/file_ops.c

DEFINITIONS
