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ipath_file_ops.c

/*
 * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/pci.h>
#include <linux/poll.h>
#include <linux/cdev.h>
#include <linux/swap.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/smp_lock.h>
#include <asm/pgtable.h>

#include "ipath_kernel.h"
#include "ipath_common.h"
#include "ipath_user_sdma.h"

static int ipath_open(struct inode *, struct file *);
static int ipath_close(struct inode *, struct file *);
static ssize_t ipath_write(struct file *, const char __user *, size_t,
                     loff_t *);
static ssize_t ipath_writev(struct kiocb *, const struct iovec *,
                      unsigned long , loff_t);
static unsigned int ipath_poll(struct file *, struct poll_table_struct *);
static int ipath_mmap(struct file *, struct vm_area_struct *);

static const struct file_operations ipath_file_ops = {
      .owner = THIS_MODULE,
      .write = ipath_write,
      .aio_write = ipath_writev,
      .open = ipath_open,
      .release = ipath_close,
      .poll = ipath_poll,
      .mmap = ipath_mmap
};

/*
 * Convert kernel virtual addresses to physical addresses so they don't
 * potentially conflict with the chip addresses used as mmap offsets.
 * It doesn't really matter what mmap offset we use as long as we can
 * interpret it correctly.
 */
static u64 cvt_kvaddr(void *p)
{
      struct page *page;
      u64 paddr = 0;

      page = vmalloc_to_page(p);
      if (page)
            paddr = page_to_pfn(page) << PAGE_SHIFT;

      return paddr;
}

static int ipath_get_base_info(struct file *fp,
                         void __user *ubase, size_t ubase_size)
{
      struct ipath_portdata *pd = port_fp(fp);
      int ret = 0;
      struct ipath_base_info *kinfo = NULL;
      struct ipath_devdata *dd = pd->port_dd;
      unsigned subport_cnt;
      int shared, master;
      size_t sz;

      subport_cnt = pd->port_subport_cnt;
      if (!subport_cnt) {
            shared = 0;
            master = 0;
            subport_cnt = 1;
      } else {
            shared = 1;
            master = !subport_fp(fp);
      }

      sz = sizeof(*kinfo);
      /* If port sharing is not requested, allow the old size structure */
      if (!shared)
            sz -= 7 * sizeof(u64);
      if (ubase_size < sz) {
            ipath_cdbg(PROC,
                     "Base size %zu, need %zu (version mismatch?)\n",
                     ubase_size, sz);
            ret = -EINVAL;
            goto bail;
      }

      kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL);
      if (kinfo == NULL) {
            ret = -ENOMEM;
            goto bail;
      }

      ret = dd->ipath_f_get_base_info(pd, kinfo);
      if (ret < 0)
            goto bail;

      kinfo->spi_rcvhdr_cnt = dd->ipath_rcvhdrcnt;
      kinfo->spi_rcvhdrent_size = dd->ipath_rcvhdrentsize;
      kinfo->spi_tidegrcnt = dd->ipath_rcvegrcnt;
      kinfo->spi_rcv_egrbufsize = dd->ipath_rcvegrbufsize;
      /*
       * have to mmap whole thing
       */
      kinfo->spi_rcv_egrbuftotlen =
            pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size;
      kinfo->spi_rcv_egrperchunk = pd->port_rcvegrbufs_perchunk;
      kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen /
            pd->port_rcvegrbuf_chunks;
      kinfo->spi_tidcnt = dd->ipath_rcvtidcnt / subport_cnt;
      if (master)
            kinfo->spi_tidcnt += dd->ipath_rcvtidcnt % subport_cnt;
      /*
       * for this use, may be ipath_cfgports summed over all chips that
       * are are configured and present
       */
      kinfo->spi_nports = dd->ipath_cfgports;
      /* unit (chip/board) our port is on */
      kinfo->spi_unit = dd->ipath_unit;
      /* for now, only a single page */
      kinfo->spi_tid_maxsize = PAGE_SIZE;

      /*
       * Doing this per port, and based on the skip value, etc.  This has
       * to be the actual buffer size, since the protocol code treats it
       * as an array.
       *
       * These have to be set to user addresses in the user code via mmap.
       * These values are used on return to user code for the mmap target
       * addresses only.  For 32 bit, same 44 bit address problem, so use
       * the physical address, not virtual.  Before 2.6.11, using the
       * page_address() macro worked, but in 2.6.11, even that returns the
       * full 64 bit address (upper bits all 1's).  So far, using the
       * physical addresses (or chip offsets, for chip mapping) works, but
       * no doubt some future kernel release will change that, and we'll be
       * on to yet another method of dealing with this.
       */
      kinfo->spi_rcvhdr_base = (u64) pd->port_rcvhdrq_phys;
      kinfo->spi_rcvhdr_tailaddr = (u64) pd->port_rcvhdrqtailaddr_phys;
      kinfo->spi_rcv_egrbufs = (u64) pd->port_rcvegr_phys;
      kinfo->spi_pioavailaddr = (u64) dd->ipath_pioavailregs_phys;
      kinfo->spi_status = (u64) kinfo->spi_pioavailaddr +
            (void *) dd->ipath_statusp -
            (void *) dd->ipath_pioavailregs_dma;
      if (!shared) {
            kinfo->spi_piocnt = pd->port_piocnt;
            kinfo->spi_piobufbase = (u64) pd->port_piobufs;
            kinfo->__spi_uregbase = (u64) dd->ipath_uregbase +
                  dd->ipath_ureg_align * pd->port_port;
      } else if (master) {
            kinfo->spi_piocnt = (pd->port_piocnt / subport_cnt) +
                            (pd->port_piocnt % subport_cnt);
            /* Master's PIO buffers are after all the slave's */
            kinfo->spi_piobufbase = (u64) pd->port_piobufs +
                  dd->ipath_palign *
                  (pd->port_piocnt - kinfo->spi_piocnt);
      } else {
            unsigned slave = subport_fp(fp) - 1;

            kinfo->spi_piocnt = pd->port_piocnt / subport_cnt;
            kinfo->spi_piobufbase = (u64) pd->port_piobufs +
                  dd->ipath_palign * kinfo->spi_piocnt * slave;
      }

      if (shared) {
            kinfo->spi_port_uregbase = (u64) dd->ipath_uregbase +
                  dd->ipath_ureg_align * pd->port_port;
            kinfo->spi_port_rcvegrbuf = kinfo->spi_rcv_egrbufs;
            kinfo->spi_port_rcvhdr_base = kinfo->spi_rcvhdr_base;
            kinfo->spi_port_rcvhdr_tailaddr = kinfo->spi_rcvhdr_tailaddr;

            kinfo->__spi_uregbase = cvt_kvaddr(pd->subport_uregbase +
                  PAGE_SIZE * subport_fp(fp));

            kinfo->spi_rcvhdr_base = cvt_kvaddr(pd->subport_rcvhdr_base +
                  pd->port_rcvhdrq_size * subport_fp(fp));
            kinfo->spi_rcvhdr_tailaddr = 0;
            kinfo->spi_rcv_egrbufs = cvt_kvaddr(pd->subport_rcvegrbuf +
                  pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size *
                  subport_fp(fp));

            kinfo->spi_subport_uregbase =
                  cvt_kvaddr(pd->subport_uregbase);
            kinfo->spi_subport_rcvegrbuf =
                  cvt_kvaddr(pd->subport_rcvegrbuf);
            kinfo->spi_subport_rcvhdr_base =
                  cvt_kvaddr(pd->subport_rcvhdr_base);
            ipath_cdbg(PROC, "port %u flags %x %llx %llx %llx\n",
                  kinfo->spi_port, kinfo->spi_runtime_flags,
                  (unsigned long long) kinfo->spi_subport_uregbase,
                  (unsigned long long) kinfo->spi_subport_rcvegrbuf,
                  (unsigned long long) kinfo->spi_subport_rcvhdr_base);
      }

      /*
       * All user buffers are 2KB buffers.  If we ever support
       * giving 4KB buffers to user processes, this will need some
       * work.
       */
      kinfo->spi_pioindex = (kinfo->spi_piobufbase -
            (dd->ipath_piobufbase & 0xffffffff)) / dd->ipath_palign;
      kinfo->spi_pioalign = dd->ipath_palign;

      kinfo->spi_qpair = IPATH_KD_QP;
      /*
       * user mode PIO buffers are always 2KB, even when 4KB can
       * be received, and sent via the kernel; this is ibmaxlen
       * for 2K MTU.
       */
      kinfo->spi_piosize = dd->ipath_piosize2k - 2 * sizeof(u32);
      kinfo->spi_mtu = dd->ipath_ibmaxlen;      /* maxlen, not ibmtu */
      kinfo->spi_port = pd->port_port;
      kinfo->spi_subport = subport_fp(fp);
      kinfo->spi_sw_version = IPATH_KERN_SWVERSION;
      kinfo->spi_hw_version = dd->ipath_revision;

      if (master) {
            kinfo->spi_runtime_flags |= IPATH_RUNTIME_MASTER;
      }

      sz = (ubase_size < sizeof(*kinfo)) ? ubase_size : sizeof(*kinfo);
      if (copy_to_user(ubase, kinfo, sz))
            ret = -EFAULT;

bail:
      kfree(kinfo);
      return ret;
}

/**
 * ipath_tid_update - update a port TID
 * @pd: the port
 * @fp: the ipath device file
 * @ti: the TID information
 *
 * The new implementation as of Oct 2004 is that the driver assigns
 * the tid and returns it to the caller.   To make it easier to
 * catch bugs, and to reduce search time, we keep a cursor for
 * each port, walking the shadow tid array to find one that's not
 * in use.
 *
 * For now, if we can't allocate the full list, we fail, although
 * in the long run, we'll allocate as many as we can, and the
 * caller will deal with that by trying the remaining pages later.
 * That means that when we fail, we have to mark the tids as not in
 * use again, in our shadow copy.
 *
 * It's up to the caller to free the tids when they are done.
 * We'll unlock the pages as they free them.
 *
 * Also, right now we are locking one page at a time, but since
 * the intended use of this routine is for a single group of
 * virtually contiguous pages, that should change to improve
 * performance.
 */
static int ipath_tid_update(struct ipath_portdata *pd, struct file *fp,
                      const struct ipath_tid_info *ti)
{
      int ret = 0, ntids;
      u32 tid, porttid, cnt, i, tidcnt, tidoff;
      u16 *tidlist;
      struct ipath_devdata *dd = pd->port_dd;
      u64 physaddr;
      unsigned long vaddr;
      u64 __iomem *tidbase;
      unsigned long tidmap[8];
      struct page **pagep = NULL;
      unsigned subport = subport_fp(fp);

      if (!dd->ipath_pageshadow) {
            ret = -ENOMEM;
            goto done;
      }

      cnt = ti->tidcnt;
      if (!cnt) {
            ipath_dbg("After copyin, tidcnt 0, tidlist %llx\n",
                    (unsigned long long) ti->tidlist);
            /*
             * Should we treat as success?  likely a bug
             */
            ret = -EFAULT;
            goto done;
      }
      porttid = pd->port_port * dd->ipath_rcvtidcnt;
      if (!pd->port_subport_cnt) {
            tidcnt = dd->ipath_rcvtidcnt;
            tid = pd->port_tidcursor;
            tidoff = 0;
      } else if (!subport) {
            tidcnt = (dd->ipath_rcvtidcnt / pd->port_subport_cnt) +
                   (dd->ipath_rcvtidcnt % pd->port_subport_cnt);
            tidoff = dd->ipath_rcvtidcnt - tidcnt;
            porttid += tidoff;
            tid = tidcursor_fp(fp);
      } else {
            tidcnt = dd->ipath_rcvtidcnt / pd->port_subport_cnt;
            tidoff = tidcnt * (subport - 1);
            porttid += tidoff;
            tid = tidcursor_fp(fp);
      }
      if (cnt > tidcnt) {
            /* make sure it all fits in port_tid_pg_list */
            dev_info(&dd->pcidev->dev, "Process tried to allocate %u "
                   "TIDs, only trying max (%u)\n", cnt, tidcnt);
            cnt = tidcnt;
      }
      pagep = &((struct page **) pd->port_tid_pg_list)[tidoff];
      tidlist = &((u16 *) &pagep[dd->ipath_rcvtidcnt])[tidoff];

      memset(tidmap, 0, sizeof(tidmap));
      /* before decrement; chip actual # */
      ntids = tidcnt;
      tidbase = (u64 __iomem *) (((char __iomem *) dd->ipath_kregbase) +
                           dd->ipath_rcvtidbase +
                           porttid * sizeof(*tidbase));

      ipath_cdbg(VERBOSE, "Port%u %u tids, cursor %u, tidbase %p\n",
               pd->port_port, cnt, tid, tidbase);

      /* virtual address of first page in transfer */
      vaddr = ti->tidvaddr;
      if (!access_ok(VERIFY_WRITE, (void __user *) vaddr,
                   cnt * PAGE_SIZE)) {
            ipath_dbg("Fail vaddr %p, %u pages, !access_ok\n",
                    (void *)vaddr, cnt);
            ret = -EFAULT;
            goto done;
      }
      ret = ipath_get_user_pages(vaddr, cnt, pagep);
      if (ret) {
            if (ret == -EBUSY) {
                  ipath_dbg("Failed to lock addr %p, %u pages "
                          "(already locked)\n",
                          (void *) vaddr, cnt);
                  /*
                   * for now, continue, and see what happens but with
                   * the new implementation, this should never happen,
                   * unless perhaps the user has mpin'ed the pages
                   * themselves (something we need to test)
                   */
                  ret = 0;
            } else {
                  dev_info(&dd->pcidev->dev,
                         "Failed to lock addr %p, %u pages: "
                         "errno %d\n", (void *) vaddr, cnt, -ret);
                  goto done;
            }
      }
      for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) {
            for (; ntids--; tid++) {
                  if (tid == tidcnt)
                        tid = 0;
                  if (!dd->ipath_pageshadow[porttid + tid])
                        break;
            }
            if (ntids < 0) {
                  /*
                   * oops, wrapped all the way through their TIDs,
                   * and didn't have enough free; see comments at
                   * start of routine
                   */
                  ipath_dbg("Not enough free TIDs for %u pages "
                          "(index %d), failing\n", cnt, i);
                  i--;  /* last tidlist[i] not filled in */
                  ret = -ENOMEM;
                  break;
            }
            tidlist[i] = tid + tidoff;
            ipath_cdbg(VERBOSE, "Updating idx %u to TID %u, "
                     "vaddr %lx\n", i, tid + tidoff, vaddr);
            /* we "know" system pages and TID pages are same size */
            dd->ipath_pageshadow[porttid + tid] = pagep[i];
            dd->ipath_physshadow[porttid + tid] = ipath_map_page(
                  dd->pcidev, pagep[i], 0, PAGE_SIZE,
                  PCI_DMA_FROMDEVICE);
            /*
             * don't need atomic or it's overhead
             */
            __set_bit(tid, tidmap);
            physaddr = dd->ipath_physshadow[porttid + tid];
            ipath_stats.sps_pagelocks++;
            ipath_cdbg(VERBOSE,
                     "TID %u, vaddr %lx, physaddr %llx pgp %p\n",
                     tid, vaddr, (unsigned long long) physaddr,
                     pagep[i]);
            dd->ipath_f_put_tid(dd, &tidbase[tid], RCVHQ_RCV_TYPE_EXPECTED,
                            physaddr);
            /*
             * don't check this tid in ipath_portshadow, since we
             * just filled it in; start with the next one.
             */
            tid++;
      }

      if (ret) {
            u32 limit;
      cleanup:
            /* jump here if copy out of updated info failed... */
            ipath_dbg("After failure (ret=%d), undo %d of %d entries\n",
                    -ret, i, cnt);
            /* same code that's in ipath_free_tid() */
            limit = sizeof(tidmap) * BITS_PER_BYTE;
            if (limit > tidcnt)
                  /* just in case size changes in future */
                  limit = tidcnt;
            tid = find_first_bit((const unsigned long *)tidmap, limit);
            for (; tid < limit; tid++) {
                  if (!test_bit(tid, tidmap))
                        continue;
                  if (dd->ipath_pageshadow[porttid + tid]) {
                        ipath_cdbg(VERBOSE, "Freeing TID %u\n",
                                 tid);
                        dd->ipath_f_put_tid(dd, &tidbase[tid],
                                        RCVHQ_RCV_TYPE_EXPECTED,
                                        dd->ipath_tidinvalid);
                        pci_unmap_page(dd->pcidev,
                              dd->ipath_physshadow[porttid + tid],
                              PAGE_SIZE, PCI_DMA_FROMDEVICE);
                        dd->ipath_pageshadow[porttid + tid] = NULL;
                        ipath_stats.sps_pageunlocks++;
                  }
            }
            ipath_release_user_pages(pagep, cnt);
      } else {
            /*
             * Copy the updated array, with ipath_tid's filled in, back
             * to user.  Since we did the copy in already, this "should
             * never fail" If it does, we have to clean up...
             */
            if (copy_to_user((void __user *)
                         (unsigned long) ti->tidlist,
                         tidlist, cnt * sizeof(*tidlist))) {
                  ret = -EFAULT;
                  goto cleanup;
            }
            if (copy_to_user((void __user *) (unsigned long) ti->tidmap,
                         tidmap, sizeof tidmap)) {
                  ret = -EFAULT;
                  goto cleanup;
            }
            if (tid == tidcnt)
                  tid = 0;
            if (!pd->port_subport_cnt)
                  pd->port_tidcursor = tid;
            else
                  tidcursor_fp(fp) = tid;
      }

done:
      if (ret)
            ipath_dbg("Failed to map %u TID pages, failing with %d\n",
                    ti->tidcnt, -ret);
      return ret;
}

/**
 * ipath_tid_free - free a port TID
 * @pd: the port
 * @subport: the subport
 * @ti: the TID info
 *
 * right now we are unlocking one page at a time, but since
 * the intended use of this routine is for a single group of
 * virtually contiguous pages, that should change to improve
 * performance.  We check that the TID is in range for this port
 * but otherwise don't check validity; if user has an error and
 * frees the wrong tid, it's only their own data that can thereby
 * be corrupted.  We do check that the TID was in use, for sanity
 * We always use our idea of the saved address, not the address that
 * they pass in to us.
 */

static int ipath_tid_free(struct ipath_portdata *pd, unsigned subport,
                    const struct ipath_tid_info *ti)
{
      int ret = 0;
      u32 tid, porttid, cnt, limit, tidcnt;
      struct ipath_devdata *dd = pd->port_dd;
      u64 __iomem *tidbase;
      unsigned long tidmap[8];

      if (!dd->ipath_pageshadow) {
            ret = -ENOMEM;
            goto done;
      }

      if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap,
                     sizeof tidmap)) {
            ret = -EFAULT;
            goto done;
      }

      porttid = pd->port_port * dd->ipath_rcvtidcnt;
      if (!pd->port_subport_cnt)
            tidcnt = dd->ipath_rcvtidcnt;
      else if (!subport) {
            tidcnt = (dd->ipath_rcvtidcnt / pd->port_subport_cnt) +
                   (dd->ipath_rcvtidcnt % pd->port_subport_cnt);
            porttid += dd->ipath_rcvtidcnt - tidcnt;
      } else {
            tidcnt = dd->ipath_rcvtidcnt / pd->port_subport_cnt;
            porttid += tidcnt * (subport - 1);
      }
      tidbase = (u64 __iomem *) ((char __iomem *)(dd->ipath_kregbase) +
                           dd->ipath_rcvtidbase +
                           porttid * sizeof(*tidbase));

      limit = sizeof(tidmap) * BITS_PER_BYTE;
      if (limit > tidcnt)
            /* just in case size changes in future */
            limit = tidcnt;
      tid = find_first_bit(tidmap, limit);
      ipath_cdbg(VERBOSE, "Port%u free %u tids; first bit (max=%d) "
               "set is %d, porttid %u\n", pd->port_port, ti->tidcnt,
               limit, tid, porttid);
      for (cnt = 0; tid < limit; tid++) {
            /*
             * small optimization; if we detect a run of 3 or so without
             * any set, use find_first_bit again.  That's mainly to
             * accelerate the case where we wrapped, so we have some at
             * the beginning, and some at the end, and a big gap
             * in the middle.
             */
            if (!test_bit(tid, tidmap))
                  continue;
            cnt++;
            if (dd->ipath_pageshadow[porttid + tid]) {
                  struct page *p;
                  p = dd->ipath_pageshadow[porttid + tid];
                  dd->ipath_pageshadow[porttid + tid] = NULL;
                  ipath_cdbg(VERBOSE, "PID %u freeing TID %u\n",
                           pid_nr(pd->port_pid), tid);
                  dd->ipath_f_put_tid(dd, &tidbase[tid],
                                  RCVHQ_RCV_TYPE_EXPECTED,
                                  dd->ipath_tidinvalid);
                  pci_unmap_page(dd->pcidev,
                        dd->ipath_physshadow[porttid + tid],
                        PAGE_SIZE, PCI_DMA_FROMDEVICE);
                  ipath_release_user_pages(&p, 1);
                  ipath_stats.sps_pageunlocks++;
            } else
                  ipath_dbg("Unused tid %u, ignoring\n", tid);
      }
      if (cnt != ti->tidcnt)
            ipath_dbg("passed in tidcnt %d, only %d bits set in map\n",
                    ti->tidcnt, cnt);
done:
      if (ret)
            ipath_dbg("Failed to unmap %u TID pages, failing with %d\n",
                    ti->tidcnt, -ret);
      return ret;
}

/**
 * ipath_set_part_key - set a partition key
 * @pd: the port
 * @key: the key
 *
 * We can have up to 4 active at a time (other than the default, which is
 * always allowed).  This is somewhat tricky, since multiple ports may set
 * the same key, so we reference count them, and clean up at exit.  All 4
 * partition keys are packed into a single infinipath register.  It's an
 * error for a process to set the same pkey multiple times.  We provide no
 * mechanism to de-allocate a pkey at this time, we may eventually need to
 * do that.  I've used the atomic operations, and no locking, and only make
 * a single pass through what's available.  This should be more than
 * adequate for some time. I'll think about spinlocks or the like if and as
 * it's necessary.
 */
static int ipath_set_part_key(struct ipath_portdata *pd, u16 key)
{
      struct ipath_devdata *dd = pd->port_dd;
      int i, any = 0, pidx = -1;
      u16 lkey = key & 0x7FFF;
      int ret;

      if (lkey == (IPATH_DEFAULT_P_KEY & 0x7FFF)) {
            /* nothing to do; this key always valid */
            ret = 0;
            goto bail;
      }

      ipath_cdbg(VERBOSE, "p%u try to set pkey %hx, current keys "
               "%hx:%x %hx:%x %hx:%x %hx:%x\n",
               pd->port_port, key, dd->ipath_pkeys[0],
               atomic_read(&dd->ipath_pkeyrefs[0]), dd->ipath_pkeys[1],
               atomic_read(&dd->ipath_pkeyrefs[1]), dd->ipath_pkeys[2],
               atomic_read(&dd->ipath_pkeyrefs[2]), dd->ipath_pkeys[3],
               atomic_read(&dd->ipath_pkeyrefs[3]));

      if (!lkey) {
            ipath_cdbg(PROC, "p%u tries to set key 0, not allowed\n",
                     pd->port_port);
            ret = -EINVAL;
            goto bail;
      }

      /*
       * Set the full membership bit, because it has to be
       * set in the register or the packet, and it seems
       * cleaner to set in the register than to force all
       * callers to set it. (see bug 4331)
       */
      key |= 0x8000;

      for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
            if (!pd->port_pkeys[i] && pidx == -1)
                  pidx = i;
            if (pd->port_pkeys[i] == key) {
                  ipath_cdbg(VERBOSE, "p%u tries to set same pkey "
                           "(%x) more than once\n",
                           pd->port_port, key);
                  ret = -EEXIST;
                  goto bail;
            }
      }
      if (pidx == -1) {
            ipath_dbg("All pkeys for port %u already in use, "
                    "can't set %x\n", pd->port_port, key);
            ret = -EBUSY;
            goto bail;
      }
      for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
            if (!dd->ipath_pkeys[i]) {
                  any++;
                  continue;
            }
            if (dd->ipath_pkeys[i] == key) {
                  atomic_t *pkrefs = &dd->ipath_pkeyrefs[i];

                  if (atomic_inc_return(pkrefs) > 1) {
                        pd->port_pkeys[pidx] = key;
                        ipath_cdbg(VERBOSE, "p%u set key %x "
                                 "matches #%d, count now %d\n",
                                 pd->port_port, key, i,
                                 atomic_read(pkrefs));
                        ret = 0;
                        goto bail;
                  } else {
                        /*
                         * lost race, decrement count, catch below
                         */
                        atomic_dec(pkrefs);
                        ipath_cdbg(VERBOSE, "Lost race, count was "
                                 "0, after dec, it's %d\n",
                                 atomic_read(pkrefs));
                        any++;
                  }
            }
            if ((dd->ipath_pkeys[i] & 0x7FFF) == lkey) {
                  /*
                   * It makes no sense to have both the limited and
                   * full membership PKEY set at the same time since
                   * the unlimited one will disable the limited one.
                   */
                  ret = -EEXIST;
                  goto bail;
            }
      }
      if (!any) {
            ipath_dbg("port %u, all pkeys already in use, "
                    "can't set %x\n", pd->port_port, key);
            ret = -EBUSY;
            goto bail;
      }
      for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
            if (!dd->ipath_pkeys[i] &&
                atomic_inc_return(&dd->ipath_pkeyrefs[i]) == 1) {
                  u64 pkey;

                  /* for ipathstats, etc. */
                  ipath_stats.sps_pkeys[i] = lkey;
                  pd->port_pkeys[pidx] = dd->ipath_pkeys[i] = key;
                  pkey =
                        (u64) dd->ipath_pkeys[0] |
                        ((u64) dd->ipath_pkeys[1] << 16) |
                        ((u64) dd->ipath_pkeys[2] << 32) |
                        ((u64) dd->ipath_pkeys[3] << 48);
                  ipath_cdbg(PROC, "p%u set key %x in #%d, "
                           "portidx %d, new pkey reg %llx\n",
                           pd->port_port, key, i, pidx,
                           (unsigned long long) pkey);
                  ipath_write_kreg(
                        dd, dd->ipath_kregs->kr_partitionkey, pkey);

                  ret = 0;
                  goto bail;
            }
      }
      ipath_dbg("port %u, all pkeys already in use 2nd pass, "
              "can't set %x\n", pd->port_port, key);
      ret = -EBUSY;

bail:
      return ret;
}

/**
 * ipath_manage_rcvq - manage a port's receive queue
 * @pd: the port
 * @subport: the subport
 * @start_stop: action to carry out
 *
 * start_stop == 0 disables receive on the port, for use in queue
 * overflow conditions.  start_stop==1 re-enables, to be used to
 * re-init the software copy of the head register
 */
static int ipath_manage_rcvq(struct ipath_portdata *pd, unsigned subport,
                       int start_stop)
{
      struct ipath_devdata *dd = pd->port_dd;

      ipath_cdbg(PROC, "%sabling rcv for unit %u port %u:%u\n",
               start_stop ? "en" : "dis", dd->ipath_unit,
               pd->port_port, subport);
      if (subport)
            goto bail;
      /* atomically clear receive enable port. */
      if (start_stop) {
            /*
             * On enable, force in-memory copy of the tail register to
             * 0, so that protocol code doesn't have to worry about
             * whether or not the chip has yet updated the in-memory
             * copy or not on return from the system call. The chip
             * always resets it's tail register back to 0 on a
             * transition from disabled to enabled.  This could cause a
             * problem if software was broken, and did the enable w/o
             * the disable, but eventually the in-memory copy will be
             * updated and correct itself, even in the face of software
             * bugs.
             */
            if (pd->port_rcvhdrtail_kvaddr)
                  ipath_clear_rcvhdrtail(pd);
            set_bit(dd->ipath_r_portenable_shift + pd->port_port,
                  &dd->ipath_rcvctrl);
      } else
            clear_bit(dd->ipath_r_portenable_shift + pd->port_port,
                    &dd->ipath_rcvctrl);
      ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
                   dd->ipath_rcvctrl);
      /* now be sure chip saw it before we return */
      ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
      if (start_stop) {
            /*
             * And try to be sure that tail reg update has happened too.
             * This should in theory interlock with the RXE changes to
             * the tail register.  Don't assign it to the tail register
             * in memory copy, since we could overwrite an update by the
             * chip if we did.
             */
            ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);
      }
      /* always; new head should be equal to new tail; see above */
bail:
      return 0;
}

static void ipath_clean_part_key(struct ipath_portdata *pd,
                         struct ipath_devdata *dd)
{
      int i, j, pchanged = 0;
      u64 oldpkey;

      /* for debugging only */
      oldpkey = (u64) dd->ipath_pkeys[0] |
            ((u64) dd->ipath_pkeys[1] << 16) |
            ((u64) dd->ipath_pkeys[2] << 32) |
            ((u64) dd->ipath_pkeys[3] << 48);

      for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
            if (!pd->port_pkeys[i])
                  continue;
            ipath_cdbg(VERBOSE, "look for key[%d] %hx in pkeys\n", i,
                     pd->port_pkeys[i]);
            for (j = 0; j < ARRAY_SIZE(dd->ipath_pkeys); j++) {
                  /* check for match independent of the global bit */
                  if ((dd->ipath_pkeys[j] & 0x7fff) !=
                      (pd->port_pkeys[i] & 0x7fff))
                        continue;
                  if (atomic_dec_and_test(&dd->ipath_pkeyrefs[j])) {
                        ipath_cdbg(VERBOSE, "p%u clear key "
                                 "%x matches #%d\n",
                                 pd->port_port,
                                 pd->port_pkeys[i], j);
                        ipath_stats.sps_pkeys[j] =
                              dd->ipath_pkeys[j] = 0;
                        pchanged++;
                  }
                  else ipath_cdbg(
                        VERBOSE, "p%u key %x matches #%d, "
                        "but ref still %d\n", pd->port_port,
                        pd->port_pkeys[i], j,
                        atomic_read(&dd->ipath_pkeyrefs[j]));
                  break;
            }
            pd->port_pkeys[i] = 0;
      }
      if (pchanged) {
            u64 pkey = (u64) dd->ipath_pkeys[0] |
                  ((u64) dd->ipath_pkeys[1] << 16) |
                  ((u64) dd->ipath_pkeys[2] << 32) |
                  ((u64) dd->ipath_pkeys[3] << 48);
            ipath_cdbg(VERBOSE, "p%u old pkey reg %llx, "
                     "new pkey reg %llx\n", pd->port_port,
                     (unsigned long long) oldpkey,
                     (unsigned long long) pkey);
            ipath_write_kreg(dd, dd->ipath_kregs->kr_partitionkey,
                         pkey);
      }
}

/*
 * Initialize the port data with the receive buffer sizes
 * so this can be done while the master port is locked.
 * Otherwise, there is a race with a slave opening the port
 * and seeing these fields uninitialized.
 */
static void init_user_egr_sizes(struct ipath_portdata *pd)
{
      struct ipath_devdata *dd = pd->port_dd;
      unsigned egrperchunk, egrcnt, size;

      /*
       * to avoid wasting a lot of memory, we allocate 32KB chunks of
       * physically contiguous memory, advance through it until used up
       * and then allocate more.  Of course, we need memory to store those
       * extra pointers, now.  Started out with 256KB, but under heavy
       * memory pressure (creating large files and then copying them over
       * NFS while doing lots of MPI jobs), we hit some allocation
       * failures, even though we can sleep...  (2.6.10) Still get
       * failures at 64K.  32K is the lowest we can go without wasting
       * additional memory.
       */
      size = 0x8000;
      egrperchunk = size / dd->ipath_rcvegrbufsize;
      egrcnt = dd->ipath_rcvegrcnt;
      pd->port_rcvegrbuf_chunks = (egrcnt + egrperchunk - 1) / egrperchunk;
      pd->port_rcvegrbufs_perchunk = egrperchunk;
      pd->port_rcvegrbuf_size = size;
}

/**
 * ipath_create_user_egr - allocate eager TID buffers
 * @pd: the port to allocate TID buffers for
 *
 * This routine is now quite different for user and kernel, because
 * the kernel uses skb's, for the accelerated network performance
 * This is the user port version
 *
 * Allocate the eager TID buffers and program them into infinipath
 * They are no longer completely contiguous, we do multiple allocation
 * calls.
 */
static int ipath_create_user_egr(struct ipath_portdata *pd)
{
      struct ipath_devdata *dd = pd->port_dd;
      unsigned e, egrcnt, egrperchunk, chunk, egrsize, egroff;
      size_t size;
      int ret;
      gfp_t gfp_flags;

      /*
       * GFP_USER, but without GFP_FS, so buffer cache can be
       * coalesced (we hope); otherwise, even at order 4,
       * heavy filesystem activity makes these fail, and we can
       * use compound pages.
       */
      gfp_flags = __GFP_WAIT | __GFP_IO | __GFP_COMP;

      egrcnt = dd->ipath_rcvegrcnt;
      /* TID number offset for this port */
      egroff = (pd->port_port - 1) * egrcnt + dd->ipath_p0_rcvegrcnt;
      egrsize = dd->ipath_rcvegrbufsize;
      ipath_cdbg(VERBOSE, "Allocating %d egr buffers, at egrtid "
               "offset %x, egrsize %u\n", egrcnt, egroff, egrsize);

      chunk = pd->port_rcvegrbuf_chunks;
      egrperchunk = pd->port_rcvegrbufs_perchunk;
      size = pd->port_rcvegrbuf_size;
      pd->port_rcvegrbuf = kmalloc(chunk * sizeof(pd->port_rcvegrbuf[0]),
                             GFP_KERNEL);
      if (!pd->port_rcvegrbuf) {
            ret = -ENOMEM;
            goto bail;
      }
      pd->port_rcvegrbuf_phys =
            kmalloc(chunk * sizeof(pd->port_rcvegrbuf_phys[0]),
                  GFP_KERNEL);
      if (!pd->port_rcvegrbuf_phys) {
            ret = -ENOMEM;
            goto bail_rcvegrbuf;
      }
      for (e = 0; e < pd->port_rcvegrbuf_chunks; e++) {

            pd->port_rcvegrbuf[e] = dma_alloc_coherent(
                  &dd->pcidev->dev, size, &pd->port_rcvegrbuf_phys[e],
                  gfp_flags);

            if (!pd->port_rcvegrbuf[e]) {
                  ret = -ENOMEM;
                  goto bail_rcvegrbuf_phys;
            }
      }

      pd->port_rcvegr_phys = pd->port_rcvegrbuf_phys[0];

      for (e = chunk = 0; chunk < pd->port_rcvegrbuf_chunks; chunk++) {
            dma_addr_t pa = pd->port_rcvegrbuf_phys[chunk];
            unsigned i;

            for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) {
                  dd->ipath_f_put_tid(dd, e + egroff +
                                  (u64 __iomem *)
                                  ((char __iomem *)
                                   dd->ipath_kregbase +
                                   dd->ipath_rcvegrbase),
                                  RCVHQ_RCV_TYPE_EAGER, pa);
                  pa += egrsize;
            }
            cond_resched();   /* don't hog the cpu */
      }

      ret = 0;
      goto bail;

bail_rcvegrbuf_phys:
      for (e = 0; e < pd->port_rcvegrbuf_chunks &&
            pd->port_rcvegrbuf[e]; e++) {
            dma_free_coherent(&dd->pcidev->dev, size,
                          pd->port_rcvegrbuf[e],
                          pd->port_rcvegrbuf_phys[e]);

      }
      kfree(pd->port_rcvegrbuf_phys);
      pd->port_rcvegrbuf_phys = NULL;
bail_rcvegrbuf:
      kfree(pd->port_rcvegrbuf);
      pd->port_rcvegrbuf = NULL;
bail:
      return ret;
}


/* common code for the mappings on dma_alloc_coherent mem */
static int ipath_mmap_mem(struct vm_area_struct *vma,
      struct ipath_portdata *pd, unsigned len, int write_ok,
      void *kvaddr, char *what)
{
      struct ipath_devdata *dd = pd->port_dd;
      unsigned long pfn;
      int ret;

      if ((vma->vm_end - vma->vm_start) > len) {
            dev_info(&dd->pcidev->dev,
                     "FAIL on %s: len %lx > %x\n", what,
                   vma->vm_end - vma->vm_start, len);
            ret = -EFAULT;
            goto bail;
      }

      if (!write_ok) {
            if (vma->vm_flags & VM_WRITE) {
                  dev_info(&dd->pcidev->dev,
                         "%s must be mapped readonly\n", what);
                  ret = -EPERM;
                  goto bail;
            }

            /* don't allow them to later change with mprotect */
            vma->vm_flags &= ~VM_MAYWRITE;
      }

      pfn = virt_to_phys(kvaddr) >> PAGE_SHIFT;
      ret = remap_pfn_range(vma, vma->vm_start, pfn,
                        len, vma->vm_page_prot);
      if (ret)
            dev_info(&dd->pcidev->dev, "%s port%u mmap of %lx, %x "
                   "bytes r%c failed: %d\n", what, pd->port_port,
                   pfn, len, write_ok?'w':'o', ret);
      else
            ipath_cdbg(VERBOSE, "%s port%u mmaped %lx, %x bytes "
                     "r%c\n", what, pd->port_port, pfn, len,
                     write_ok?'w':'o');
bail:
      return ret;
}

static int mmap_ureg(struct vm_area_struct *vma, struct ipath_devdata *dd,
                 u64 ureg)
{
      unsigned long phys;
      int ret;

      /*
       * This is real hardware, so use io_remap.  This is the mechanism
       * for the user process to update the head registers for their port
       * in the chip.
       */
      if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
            dev_info(&dd->pcidev->dev, "FAIL mmap userreg: reqlen "
                   "%lx > PAGE\n", vma->vm_end - vma->vm_start);
            ret = -EFAULT;
      } else {
            phys = dd->ipath_physaddr + ureg;
            vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

            vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
            ret = io_remap_pfn_range(vma, vma->vm_start,
                               phys >> PAGE_SHIFT,
                               vma->vm_end - vma->vm_start,
                               vma->vm_page_prot);
      }
      return ret;
}

static int mmap_piobufs(struct vm_area_struct *vma,
                  struct ipath_devdata *dd,
                  struct ipath_portdata *pd,
                  unsigned piobufs, unsigned piocnt)
{
      unsigned long phys;
      int ret;

      /*
       * When we map the PIO buffers in the chip, we want to map them as
       * writeonly, no read possible.   This prevents access to previous
       * process data, and catches users who might try to read the i/o
       * space due to a bug.
       */
      if ((vma->vm_end - vma->vm_start) > (piocnt * dd->ipath_palign)) {
            dev_info(&dd->pcidev->dev, "FAIL mmap piobufs: "
                   "reqlen %lx > PAGE\n",
                   vma->vm_end - vma->vm_start);
            ret = -EINVAL;
            goto bail;
      }

      phys = dd->ipath_physaddr + piobufs;

#if defined(__powerpc__)
      /* There isn't a generic way to specify writethrough mappings */
      pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
      pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
      pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED;
#endif

      /*
       * don't allow them to later change to readable with mprotect (for when
       * not initially mapped readable, as is normally the case)
       */
      vma->vm_flags &= ~VM_MAYREAD;
      vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;

      ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT,
                         vma->vm_end - vma->vm_start,
                         vma->vm_page_prot);
bail:
      return ret;
}

static int mmap_rcvegrbufs(struct vm_area_struct *vma,
                     struct ipath_portdata *pd)
{
      struct ipath_devdata *dd = pd->port_dd;
      unsigned long start, size;
      size_t total_size, i;
      unsigned long pfn;
      int ret;

      size = pd->port_rcvegrbuf_size;
      total_size = pd->port_rcvegrbuf_chunks * size;
      if ((vma->vm_end - vma->vm_start) > total_size) {
            dev_info(&dd->pcidev->dev, "FAIL on egr bufs: "
                   "reqlen %lx > actual %lx\n",
                   vma->vm_end - vma->vm_start,
                   (unsigned long) total_size);
            ret = -EINVAL;
            goto bail;
      }

      if (vma->vm_flags & VM_WRITE) {
            dev_info(&dd->pcidev->dev, "Can't map eager buffers as "
                   "writable (flags=%lx)\n", vma->vm_flags);
            ret = -EPERM;
            goto bail;
      }
      /* don't allow them to later change to writeable with mprotect */
      vma->vm_flags &= ~VM_MAYWRITE;

      start = vma->vm_start;

      for (i = 0; i < pd->port_rcvegrbuf_chunks; i++, start += size) {
            pfn = virt_to_phys(pd->port_rcvegrbuf[i]) >> PAGE_SHIFT;
            ret = remap_pfn_range(vma, start, pfn, size,
                              vma->vm_page_prot);
            if (ret < 0)
                  goto bail;
      }
      ret = 0;

bail:
      return ret;
}

/*
 * ipath_file_vma_fault - handle a VMA page fault.
 */
static int ipath_file_vma_fault(struct vm_area_struct *vma,
                              struct vm_fault *vmf)
{
      struct page *page;

      page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT));
      if (!page)
            return VM_FAULT_SIGBUS;
      get_page(page);
      vmf->page = page;

      return 0;
}

static struct vm_operations_struct ipath_file_vm_ops = {
      .fault = ipath_file_vma_fault,
};

static int mmap_kvaddr(struct vm_area_struct *vma, u64 pgaddr,
                   struct ipath_portdata *pd, unsigned subport)
{
      unsigned long len;
      struct ipath_devdata *dd;
      void *addr;
      size_t size;
      int ret = 0;

      /* If the port is not shared, all addresses should be physical */
      if (!pd->port_subport_cnt)
            goto bail;

      dd = pd->port_dd;
      size = pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size;

      /*
       * Each process has all the subport uregbase, rcvhdrq, and
       * rcvegrbufs mmapped - as an array for all the processes,
       * and also separately for this process.
       */
      if (pgaddr == cvt_kvaddr(pd->subport_uregbase)) {
            addr = pd->subport_uregbase;
            size = PAGE_SIZE * pd->port_subport_cnt;
      } else if (pgaddr == cvt_kvaddr(pd->subport_rcvhdr_base)) {
            addr = pd->subport_rcvhdr_base;
            size = pd->port_rcvhdrq_size * pd->port_subport_cnt;
      } else if (pgaddr == cvt_kvaddr(pd->subport_rcvegrbuf)) {
            addr = pd->subport_rcvegrbuf;
            size *= pd->port_subport_cnt;
        } else if (pgaddr == cvt_kvaddr(pd->subport_uregbase +
                                        PAGE_SIZE * subport)) {
                addr = pd->subport_uregbase + PAGE_SIZE * subport;
                size = PAGE_SIZE;
        } else if (pgaddr == cvt_kvaddr(pd->subport_rcvhdr_base +
                                pd->port_rcvhdrq_size * subport)) {
                addr = pd->subport_rcvhdr_base +
                        pd->port_rcvhdrq_size * subport;
                size = pd->port_rcvhdrq_size;
        } else if (pgaddr == cvt_kvaddr(pd->subport_rcvegrbuf +
                               size * subport)) {
                addr = pd->subport_rcvegrbuf + size * subport;
                /* rcvegrbufs are read-only on the slave */
                if (vma->vm_flags & VM_WRITE) {
                        dev_info(&dd->pcidev->dev,
                                 "Can't map eager buffers as "
                                 "writable (flags=%lx)\n", vma->vm_flags);
                        ret = -EPERM;
                        goto bail;
                }
                /*
                 * Don't allow permission to later change to writeable
                 * with mprotect.
                 */
                vma->vm_flags &= ~VM_MAYWRITE;
      } else {
            goto bail;
      }
      len = vma->vm_end - vma->vm_start;
      if (len > size) {
            ipath_cdbg(MM, "FAIL: reqlen %lx > %zx\n", len, size);
            ret = -EINVAL;
            goto bail;
      }

      vma->vm_pgoff = (unsigned long) addr >> PAGE_SHIFT;
      vma->vm_ops = &ipath_file_vm_ops;
      vma->vm_flags |= VM_RESERVED | VM_DONTEXPAND;
      ret = 1;

bail:
      return ret;
}

/**
 * ipath_mmap - mmap various structures into user space
 * @fp: the file pointer
 * @vma: the VM area
 *
 * We use this to have a shared buffer between the kernel and the user code
 * for the rcvhdr queue, egr buffers, and the per-port user regs and pio
 * buffers in the chip.  We have the open and close entries so we can bump
 * the ref count and keep the driver from being unloaded while still mapped.
 */
static int ipath_mmap(struct file *fp, struct vm_area_struct *vma)
{
      struct ipath_portdata *pd;
      struct ipath_devdata *dd;
      u64 pgaddr, ureg;
      unsigned piobufs, piocnt;
      int ret;

      pd = port_fp(fp);
      if (!pd) {
            ret = -EINVAL;
            goto bail;
      }
      dd = pd->port_dd;

      /*
       * This is the ipath_do_user_init() code, mapping the shared buffers
       * into the user process. The address referred to by vm_pgoff is the
       * file offset passed via mmap().  For shared ports, this is the
       * kernel vmalloc() address of the pages to share with the master.
       * For non-shared or master ports, this is a physical address.
       * We only do one mmap for each space mapped.
       */
      pgaddr = vma->vm_pgoff << PAGE_SHIFT;

      /*
       * Check for 0 in case one of the allocations failed, but user
       * called mmap anyway.
       */
      if (!pgaddr)  {
            ret = -EINVAL;
            goto bail;
      }

      ipath_cdbg(MM, "pgaddr %llx vm_start=%lx len %lx port %u:%u:%u\n",
               (unsigned long long) pgaddr, vma->vm_start,
               vma->vm_end - vma->vm_start, dd->ipath_unit,
               pd->port_port, subport_fp(fp));

      /*
       * Physical addresses must fit in 40 bits for our hardware.
       * Check for kernel virtual addresses first, anything else must
       * match a HW or memory address.
       */
      ret = mmap_kvaddr(vma, pgaddr, pd, subport_fp(fp));
      if (ret) {
            if (ret > 0)
                  ret = 0;
            goto bail;
      }

      ureg = dd->ipath_uregbase + dd->ipath_ureg_align * pd->port_port;
      if (!pd->port_subport_cnt) {
            /* port is not shared */
            piocnt = pd->port_piocnt;
            piobufs = pd->port_piobufs;
      } else if (!subport_fp(fp)) {
            /* caller is the master */
            piocnt = (pd->port_piocnt / pd->port_subport_cnt) +
                   (pd->port_piocnt % pd->port_subport_cnt);
            piobufs = pd->port_piobufs +
                  dd->ipath_palign * (pd->port_piocnt - piocnt);
      } else {
            unsigned slave = subport_fp(fp) - 1;

            /* caller is a slave */
            piocnt = pd->port_piocnt / pd->port_subport_cnt;
            piobufs = pd->port_piobufs + dd->ipath_palign * piocnt * slave;
      }

      if (pgaddr == ureg)
            ret = mmap_ureg(vma, dd, ureg);
      else if (pgaddr == piobufs)
            ret = mmap_piobufs(vma, dd, pd, piobufs, piocnt);
      else if (pgaddr == dd->ipath_pioavailregs_phys)
            /* in-memory copy of pioavail registers */
            ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0,
                                   (void *) dd->ipath_pioavailregs_dma,
                             "pioavail registers");
      else if (pgaddr == pd->port_rcvegr_phys)
            ret = mmap_rcvegrbufs(vma, pd);
      else if (pgaddr == (u64) pd->port_rcvhdrq_phys)
            /*
             * The rcvhdrq itself; readonly except on HT (so have
             * to allow writable mapping), multiple pages, contiguous
             * from an i/o perspective.
             */
            ret = ipath_mmap_mem(vma, pd, pd->port_rcvhdrq_size, 1,
                             pd->port_rcvhdrq,
                             "rcvhdrq");
      else if (pgaddr == (u64) pd->port_rcvhdrqtailaddr_phys)
            /* in-memory copy of rcvhdrq tail register */
            ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0,
                             pd->port_rcvhdrtail_kvaddr,
                             "rcvhdrq tail");
      else
            ret = -EINVAL;

      vma->vm_private_data = NULL;

      if (ret < 0)
            dev_info(&dd->pcidev->dev,
                   "Failure %d on off %llx len %lx\n",
                   -ret, (unsigned long long)pgaddr,
                   vma->vm_end - vma->vm_start);
bail:
      return ret;
}

static unsigned ipath_poll_hdrqfull(struct ipath_portdata *pd)
{
      unsigned pollflag = 0;

      if ((pd->poll_type & IPATH_POLL_TYPE_OVERFLOW) &&
          pd->port_hdrqfull != pd->port_hdrqfull_poll) {
            pollflag |= POLLIN | POLLRDNORM;
            pd->port_hdrqfull_poll = pd->port_hdrqfull;
      }

      return pollflag;
}

static unsigned int ipath_poll_urgent(struct ipath_portdata *pd,
                              struct file *fp,
                              struct poll_table_struct *pt)
{
      unsigned pollflag = 0;
      struct ipath_devdata *dd;

      dd = pd->port_dd;

      /* variable access in ipath_poll_hdrqfull() needs this */
      rmb();
      pollflag = ipath_poll_hdrqfull(pd);

      if (pd->port_urgent != pd->port_urgent_poll) {
            pollflag |= POLLIN | POLLRDNORM;
            pd->port_urgent_poll = pd->port_urgent;
      }

      if (!pollflag) {
            /* this saves a spin_lock/unlock in interrupt handler... */
            set_bit(IPATH_PORT_WAITING_URG, &pd->port_flag);
            /* flush waiting flag so don't miss an event... */
            wmb();
            poll_wait(fp, &pd->port_wait, pt);
      }

      return pollflag;
}

static unsigned int ipath_poll_next(struct ipath_portdata *pd,
                            struct file *fp,
                            struct poll_table_struct *pt)
{
      u32 head;
      u32 tail;
      unsigned pollflag = 0;
      struct ipath_devdata *dd;

      dd = pd->port_dd;

      /* variable access in ipath_poll_hdrqfull() needs this */
      rmb();
      pollflag = ipath_poll_hdrqfull(pd);

      head = ipath_read_ureg32(dd, ur_rcvhdrhead, pd->port_port);
      if (pd->port_rcvhdrtail_kvaddr)
            tail = ipath_get_rcvhdrtail(pd);
      else
            tail = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port);

      if (head != tail)
            pollflag |= POLLIN | POLLRDNORM;
      else {
            /* this saves a spin_lock/unlock in interrupt handler */
            set_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag);
            /* flush waiting flag so we don't miss an event */
            wmb();

            set_bit(pd->port_port + dd->ipath_r_intravail_shift,
                  &dd->ipath_rcvctrl);

            ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
                         dd->ipath_rcvctrl);

            if (dd->ipath_rhdrhead_intr_off) /* arm rcv interrupt */
                  ipath_write_ureg(dd, ur_rcvhdrhead,
                               dd->ipath_rhdrhead_intr_off | head,
                               pd->port_port);

            poll_wait(fp, &pd->port_wait, pt);
      }

      return pollflag;
}

static unsigned int ipath_poll(struct file *fp,
                         struct poll_table_struct *pt)
{
      struct ipath_portdata *pd;
      unsigned pollflag;

      pd = port_fp(fp);
      if (!pd)
            pollflag = 0;
      else if (pd->poll_type & IPATH_POLL_TYPE_URGENT)
            pollflag = ipath_poll_urgent(pd, fp, pt);
      else
            pollflag = ipath_poll_next(pd, fp, pt);

      return pollflag;
}

static int ipath_supports_subports(int user_swmajor, int user_swminor)
{
      /* no subport implementation prior to software version 1.3 */
      return (user_swmajor > 1) || (user_swminor >= 3);
}

static int ipath_compatible_subports(int user_swmajor, int user_swminor)
{
      /* this code is written long-hand for clarity */
      if (IPATH_USER_SWMAJOR != user_swmajor) {
            /* no promise of compatibility if major mismatch */
            return 0;
      }
      if (IPATH_USER_SWMAJOR == 1) {
            switch (IPATH_USER_SWMINOR) {
            case 0:
            case 1:
            case 2:
                  /* no subport implementation so cannot be compatible */
                  return 0;
            case 3:
                  /* 3 is only compatible with itself */
                  return user_swminor == 3;
            default:
                  /* >= 4 are compatible (or are expected to be) */
                  return user_swminor >= 4;
            }
      }
      /* make no promises yet for future major versions */
      return 0;
}

static int init_subports(struct ipath_devdata *dd,
                   struct ipath_portdata *pd,
                   const struct ipath_user_info *uinfo)
{
      int ret = 0;
      unsigned num_subports;
      size_t size;

      /*
       * If the user is requesting zero subports,
       * skip the subport allocation.
       */
      if (uinfo->spu_subport_cnt <= 0)
            goto bail;

      /* Self-consistency check for ipath_compatible_subports() */
      if (ipath_supports_subports(IPATH_USER_SWMAJOR, IPATH_USER_SWMINOR) &&
          !ipath_compatible_subports(IPATH_USER_SWMAJOR,
                               IPATH_USER_SWMINOR)) {
            dev_info(&dd->pcidev->dev,
                   "Inconsistent ipath_compatible_subports()\n");
            goto bail;
      }

      /* Check for subport compatibility */
      if (!ipath_compatible_subports(uinfo->spu_userversion >> 16,
                               uinfo->spu_userversion & 0xffff)) {
            dev_info(&dd->pcidev->dev,
                   "Mismatched user version (%d.%d) and driver "
                   "version (%d.%d) while port sharing. Ensure "
                         "that driver and library are from the same "
                         "release.\n",
                   (int) (uinfo->spu_userversion >> 16),
                         (int) (uinfo->spu_userversion & 0xffff),
                   IPATH_USER_SWMAJOR,
                       IPATH_USER_SWMINOR);
            goto bail;
      }
      if (uinfo->spu_subport_cnt > INFINIPATH_MAX_SUBPORT) {
            ret = -EINVAL;
            goto bail;
      }

      num_subports = uinfo->spu_subport_cnt;
      pd->subport_uregbase = vmalloc(PAGE_SIZE * num_subports);
      if (!pd->subport_uregbase) {
            ret = -ENOMEM;
            goto bail;
      }
      /* Note: pd->port_rcvhdrq_size isn't initialized yet. */
      size = ALIGN(dd->ipath_rcvhdrcnt * dd->ipath_rcvhdrentsize *
                 sizeof(u32), PAGE_SIZE) * num_subports;
      pd->subport_rcvhdr_base = vmalloc(size);
      if (!pd->subport_rcvhdr_base) {
            ret = -ENOMEM;
            goto bail_ureg;
      }

      pd->subport_rcvegrbuf = vmalloc(pd->port_rcvegrbuf_chunks *
                              pd->port_rcvegrbuf_size *
                              num_subports);
      if (!pd->subport_rcvegrbuf) {
            ret = -ENOMEM;
            goto bail_rhdr;
      }

      pd->port_subport_cnt = uinfo->spu_subport_cnt;
      pd->port_subport_id = uinfo->spu_subport_id;
      pd->active_slaves = 1;
      set_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag);
      memset(pd->subport_uregbase, 0, PAGE_SIZE * num_subports);
      memset(pd->subport_rcvhdr_base, 0, size);
      memset(pd->subport_rcvegrbuf, 0, pd->port_rcvegrbuf_chunks *
                                 pd->port_rcvegrbuf_size *
                                 num_subports);
      goto bail;

bail_rhdr:
      vfree(pd->subport_rcvhdr_base);
bail_ureg:
      vfree(pd->subport_uregbase);
      pd->subport_uregbase = NULL;
bail:
      return ret;
}

static int try_alloc_port(struct ipath_devdata *dd, int port,
                    struct file *fp,
                    const struct ipath_user_info *uinfo)
{
      struct ipath_portdata *pd;
      int ret;

      if (!(pd = dd->ipath_pd[port])) {
            void *ptmp;

            pd = kzalloc(sizeof(struct ipath_portdata), GFP_KERNEL);

            /*
             * Allocate memory for use in ipath_tid_update() just once
             * at open, not per call.  Reduces cost of expected send
             * setup.
             */
            ptmp = kmalloc(dd->ipath_rcvtidcnt * sizeof(u16) +
                         dd->ipath_rcvtidcnt * sizeof(struct page **),
                         GFP_KERNEL);
            if (!pd || !ptmp) {
                  ipath_dev_err(dd, "Unable to allocate portdata "
                              "memory, failing open\n");
                  ret = -ENOMEM;
                  kfree(pd);
                  kfree(ptmp);
                  goto bail;
            }
            dd->ipath_pd[port] = pd;
            dd->ipath_pd[port]->port_port = port;
            dd->ipath_pd[port]->port_dd = dd;
            dd->ipath_pd[port]->port_tid_pg_list = ptmp;
            init_waitqueue_head(&dd->ipath_pd[port]->port_wait);
      }
      if (!pd->port_cnt) {
            pd->userversion = uinfo->spu_userversion;
            init_user_egr_sizes(pd);
            if ((ret = init_subports(dd, pd, uinfo)) != 0)
                  goto bail;
            ipath_cdbg(PROC, "%s[%u] opened unit:port %u:%u\n",
                     current->comm, current->pid, dd->ipath_unit,
                     port);
            pd->port_cnt = 1;
            port_fp(fp) = pd;
            pd->port_pid = get_pid(task_pid(current));
            strncpy(pd->port_comm, current->comm, sizeof(pd->port_comm));
            ipath_stats.sps_ports++;
            ret = 0;
      } else
            ret = -EBUSY;

bail:
      return ret;
}

static inline int usable(struct ipath_devdata *dd)
{
      return dd &&
            (dd->ipath_flags & IPATH_PRESENT) &&
            dd->ipath_kregbase &&
            dd->ipath_lid &&
            !(dd->ipath_flags & (IPATH_LINKDOWN | IPATH_DISABLED
                             | IPATH_LINKUNK));
}

static int find_free_port(int unit, struct file *fp,
                    const struct ipath_user_info *uinfo)
{
      struct ipath_devdata *dd = ipath_lookup(unit);
      int ret, i;

      if (!dd) {
            ret = -ENODEV;
            goto bail;
      }

      if (!usable(dd)) {
            ret = -ENETDOWN;
            goto bail;
      }

      for (i = 1; i < dd->ipath_cfgports; i++) {
            ret = try_alloc_port(dd, i, fp, uinfo);
            if (ret != -EBUSY)
                  goto bail;
      }
      ret = -EBUSY;

bail:
      return ret;
}

static int find_best_unit(struct file *fp,
                    const struct ipath_user_info *uinfo)
{
      int ret = 0, i, prefunit = -1, devmax;
      int maxofallports, npresent, nup;
      int ndev;

      devmax = ipath_count_units(&npresent, &nup, &maxofallports);

      /*
       * This code is present to allow a knowledgeable person to
       * specify the layout of processes to processors before opening
       * this driver, and then we'll assign the process to the "closest"
       * InfiniPath chip to that processor (we assume reasonable connectivity,
       * for now).  This code assumes that if affinity has been set
       * before this point, that at most one cpu is set; for now this
       * is reasonable.  I check for both cpumask_empty() and cpumask_full(),
       * in case some kernel variant sets none of the bits when no
       * affinity is set.  2.6.11 and 12 kernels have all present
       * cpus set.  Some day we'll have to fix it up further to handle
       * a cpu subset.  This algorithm fails for two HT chips connected
       * in tunnel fashion.  Eventually this needs real topology
       * information.  There may be some issues with dual core numbering
       * as well.  This needs more work prior to release.
       */
      if (!cpumask_empty(&current->cpus_allowed) &&
          !cpumask_full(&current->cpus_allowed)) {
            int ncpus = num_online_cpus(), curcpu = -1, nset = 0;
            for (i = 0; i < ncpus; i++)
                  if (cpumask_test_cpu(i, &current->cpus_allowed)) {
                        ipath_cdbg(PROC, "%s[%u] affinity set for "
                                 "cpu %d/%d\n", current->comm,
                                 current->pid, i, ncpus);
                        curcpu = i;
                        nset++;
                  }
            if (curcpu != -1 && nset != ncpus) {
                  if (npresent) {
                        prefunit = curcpu / (ncpus / npresent);
                        ipath_cdbg(PROC,"%s[%u] %d chips, %d cpus, "
                                "%d cpus/chip, select unit %d\n",
                                current->comm, current->pid,
                                npresent, ncpus, ncpus / npresent,
                                prefunit);
                  }
            }
      }

      /*
       * user ports start at 1, kernel port is 0
       * For now, we do round-robin access across all chips
       */

      if (prefunit != -1)
            devmax = prefunit + 1;
recheck:
      for (i = 1; i < maxofallports; i++) {
            for (ndev = prefunit != -1 ? prefunit : 0; ndev < devmax;
                 ndev++) {
                  struct ipath_devdata *dd = ipath_lookup(ndev);

                  if (!usable(dd))
                        continue; /* can't use this unit */
                  if (i >= dd->ipath_cfgports)
                        /*
                         * Maxed out on users of this unit. Try
                         * next.
                         */
                        continue;
                  ret = try_alloc_port(dd, i, fp, uinfo);
                  if (!ret)
                        goto done;
            }
      }

      if (npresent) {
            if (nup == 0) {
                  ret = -ENETDOWN;
                  ipath_dbg("No ports available (none initialized "
                          "and ready)\n");
            } else {
                  if (prefunit > 0) {
                        /* if started above 0, retry from 0 */
                        ipath_cdbg(PROC,
                                 "%s[%u] no ports on prefunit "
                                 "%d, clear and re-check\n",
                                 current->comm, current->pid,
                                 prefunit);
                        devmax = ipath_count_units(NULL, NULL,
                                             NULL);
                        prefunit = -1;
                        goto recheck;
                  }
                  ret = -EBUSY;
                  ipath_dbg("No ports available\n");
            }
      } else {
            ret = -ENXIO;
            ipath_dbg("No boards found\n");
      }

done:
      return ret;
}

static int find_shared_port(struct file *fp,
                      const struct ipath_user_info *uinfo)
{
      int devmax, ndev, i;
      int ret = 0;

      devmax = ipath_count_units(NULL, NULL, NULL);

      for (ndev = 0; ndev < devmax; ndev++) {
            struct ipath_devdata *dd = ipath_lookup(ndev);

            if (!usable(dd))
                  continue;
            for (i = 1; i < dd->ipath_cfgports; i++) {
                  struct ipath_portdata *pd = dd->ipath_pd[i];

                  /* Skip ports which are not yet open */
                  if (!pd || !pd->port_cnt)
                        continue;
                  /* Skip port if it doesn't match the requested one */
                  if (pd->port_subport_id != uinfo->spu_subport_id)
                        continue;
                  /* Verify the sharing process matches the master */
                  if (pd->port_subport_cnt != uinfo->spu_subport_cnt ||
                      pd->userversion != uinfo->spu_userversion ||
                      pd->port_cnt >= pd->port_subport_cnt) {
                        ret = -EINVAL;
                        goto done;
                  }
                  port_fp(fp) = pd;
                  subport_fp(fp) = pd->port_cnt++;
                  pd->port_subpid[subport_fp(fp)] =
                        get_pid(task_pid(current));
                  tidcursor_fp(fp) = 0;
                  pd->active_slaves |= 1 << subport_fp(fp);
                  ipath_cdbg(PROC,
                           "%s[%u] %u sharing %s[%u] unit:port %u:%u\n",
                           current->comm, current->pid,
                           subport_fp(fp),
                           pd->port_comm, pid_nr(pd->port_pid),
                           dd->ipath_unit, pd->port_port);
                  ret = 1;
                  goto done;
            }
      }

done:
      return ret;
}

static int ipath_open(struct inode *in, struct file *fp)
{
      /* The real work is performed later in ipath_assign_port() */
      cycle_kernel_lock();
      fp->private_data = kzalloc(sizeof(struct ipath_filedata), GFP_KERNEL);
      return fp->private_data ? 0 : -ENOMEM;
}

/* Get port early, so can set affinity prior to memory allocation */
static int ipath_assign_port(struct file *fp,
                        const struct ipath_user_info *uinfo)
{
      int ret;
      int i_minor;
      unsigned swmajor, swminor;

      /* Check to be sure we haven't already initialized this file */
      if (port_fp(fp)) {
            ret = -EINVAL;
            goto done;
      }

      /* for now, if major version is different, bail */
      swmajor = uinfo->spu_userversion >> 16;
      if (swmajor != IPATH_USER_SWMAJOR) {
            ipath_dbg("User major version %d not same as driver "
                    "major %d\n", uinfo->spu_userversion >> 16,
                    IPATH_USER_SWMAJOR);
            ret = -ENODEV;
            goto done;
      }

      swminor = uinfo->spu_userversion & 0xffff;
      if (swminor != IPATH_USER_SWMINOR)
            ipath_dbg("User minor version %d not same as driver "
                    "minor %d\n", swminor, IPATH_USER_SWMINOR);

      mutex_lock(&ipath_mutex);

      if (ipath_compatible_subports(swmajor, swminor) &&
          uinfo->spu_subport_cnt &&
          (ret = find_shared_port(fp, uinfo))) {
            if (ret > 0)
                  ret = 0;
            goto done_chk_sdma;
      }

      i_minor = iminor(fp->f_path.dentry->d_inode) - IPATH_USER_MINOR_BASE;
      ipath_cdbg(VERBOSE, "open on dev %lx (minor %d)\n",
               (long)fp->f_path.dentry->d_inode->i_rdev, i_minor);

      if (i_minor)
            ret = find_free_port(i_minor - 1, fp, uinfo);
      else
            ret = find_best_unit(fp, uinfo);

done_chk_sdma:
      if (!ret) {
            struct ipath_filedata *fd = fp->private_data;
            const struct ipath_portdata *pd = fd->pd;
            const struct ipath_devdata *dd = pd->port_dd;

            fd->pq = ipath_user_sdma_queue_create(&dd->pcidev->dev,
                                          dd->ipath_unit,
                                          pd->port_port,
                                          fd->subport);

            if (!fd->pq)
                  ret = -ENOMEM;
      }

      mutex_unlock(&ipath_mutex);

done:
      return ret;
}


static int ipath_do_user_init(struct file *fp,
                        const struct ipath_user_info *uinfo)
{
      int ret;
      struct ipath_portdata *pd = port_fp(fp);
      struct ipath_devdata *dd;
      u32 head32;

      /* Subports don't need to initialize anything since master did it. */
      if (subport_fp(fp)) {
            ret = wait_event_interruptible(pd->port_wait,
                  !test_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag));
            goto done;
      }

      dd = pd->port_dd;

      if (uinfo->spu_rcvhdrsize) {
            ret = ipath_setrcvhdrsize(dd, uinfo->spu_rcvhdrsize);
            if (ret)
                  goto done;
      }

      /* for now we do nothing with rcvhdrcnt: uinfo->spu_rcvhdrcnt */

      /* some ports may get extra buffers, calculate that here */
      if (pd->port_port <= dd->ipath_ports_extrabuf)
            pd->port_piocnt = dd->ipath_pbufsport + 1;
      else
            pd->port_piocnt = dd->ipath_pbufsport;

      /* for right now, kernel piobufs are at end, so port 1 is at 0 */
      if (pd->port_port <= dd->ipath_ports_extrabuf)
            pd->port_pio_base = (dd->ipath_pbufsport + 1)
                  * (pd->port_port - 1);
      else
            pd->port_pio_base = dd->ipath_ports_extrabuf +
                  dd->ipath_pbufsport * (pd->port_port - 1);
      pd->port_piobufs = dd->ipath_piobufbase +
            pd->port_pio_base * dd->ipath_palign;
      ipath_cdbg(VERBOSE, "piobuf base for port %u is 0x%x, piocnt %u,"
            " first pio %u\n", pd->port_port, pd->port_piobufs,
            pd->port_piocnt, pd->port_pio_base);
      ipath_chg_pioavailkernel(dd, pd->port_pio_base, pd->port_piocnt, 0);

      /*
       * Now allocate the rcvhdr Q and eager TIDs; skip the TID
       * array for time being.  If pd->port_port > chip-supported,
       * we need to do extra stuff here to handle by handling overflow
       * through port 0, someday
       */
      ret = ipath_create_rcvhdrq(dd, pd);
      if (!ret)
            ret = ipath_create_user_egr(pd);
      if (ret)
            goto done;

      /*
       * set the eager head register for this port to the current values
       * of the tail pointers, since we don't know if they were
       * updated on last use of the port.
       */
      head32 = ipath_read_ureg32(dd, ur_rcvegrindextail, pd->port_port);
      ipath_write_ureg(dd, ur_rcvegrindexhead, head32, pd->port_port);
      pd->port_lastrcvhdrqtail = -1;
      ipath_cdbg(VERBOSE, "Wrote port%d egrhead %x from tail regs\n",
            pd->port_port, head32);
      pd->port_tidcursor = 0; /* start at beginning after open */

      /* initialize poll variables... */
      pd->port_urgent = 0;
      pd->port_urgent_poll = 0;
      pd->port_hdrqfull_poll = pd->port_hdrqfull;

      /*
       * Now enable the port for receive.
       * For chips that are set to DMA the tail register to memory
       * when they change (and when the update bit transitions from
       * 0 to 1.  So for those chips, we turn it off and then back on.
       * This will (very briefly) affect any other open ports, but the
       * duration is very short, and therefore isn't an issue.  We
       * explictly set the in-memory tail copy to 0 beforehand, so we
       * don't have to wait to be sure the DMA update has happened
       * (chip resets head/tail to 0 on transition to enable).
       */
      set_bit(dd->ipath_r_portenable_shift + pd->port_port,
            &dd->ipath_rcvctrl);
      if (!(dd->ipath_flags & IPATH_NODMA_RTAIL)) {
            if (pd->port_rcvhdrtail_kvaddr)
                  ipath_clear_rcvhdrtail(pd);
            ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
                  dd->ipath_rcvctrl &
                  ~(1ULL << dd->ipath_r_tailupd_shift));
      }
      ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
                   dd->ipath_rcvctrl);
      /* Notify any waiting slaves */
      if (pd->port_subport_cnt) {
            clear_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag);
            wake_up(&pd->port_wait);
      }
done:
      return ret;
}

/**
 * unlock_exptid - unlock any expected TID entries port still had in use
 * @pd: port
 *
 * We don't actually update the chip here, because we do a bulk update
 * below, using ipath_f_clear_tids.
 */
static void unlock_expected_tids(struct ipath_portdata *pd)
{
      struct ipath_devdata *dd = pd->port_dd;
      int port_tidbase = pd->port_port * dd->ipath_rcvtidcnt;
      int i, cnt = 0, maxtid = port_tidbase + dd->ipath_rcvtidcnt;

      ipath_cdbg(VERBOSE, "Port %u unlocking any locked expTID pages\n",
               pd->port_port);
      for (i = port_tidbase; i < maxtid; i++) {
            struct page *ps = dd->ipath_pageshadow[i];

            if (!ps)
                  continue;

            dd->ipath_pageshadow[i] = NULL;
            pci_unmap_page(dd->pcidev, dd->ipath_physshadow[i],
                  PAGE_SIZE, PCI_DMA_FROMDEVICE);
            ipath_release_user_pages_on_close(&ps, 1);
            cnt++;
            ipath_stats.sps_pageunlocks++;
      }
      if (cnt)
            ipath_cdbg(VERBOSE, "Port %u locked %u expTID entries\n",
                     pd->port_port, cnt);

      if (ipath_stats.sps_pagelocks || ipath_stats.sps_pageunlocks)
            ipath_cdbg(VERBOSE, "%llu pages locked, %llu unlocked\n",
                     (unsigned long long) ipath_stats.sps_pagelocks,
                     (unsigned long long)
                     ipath_stats.sps_pageunlocks);
}

static int ipath_close(struct inode *in, struct file *fp)
{
      int ret = 0;
      struct ipath_filedata *fd;
      struct ipath_portdata *pd;
      struct ipath_devdata *dd;
      unsigned long flags;
      unsigned port;
      struct pid *pid;

      ipath_cdbg(VERBOSE, "close on dev %lx, private data %p\n",
               (long)in->i_rdev, fp->private_data);

      mutex_lock(&ipath_mutex);

      fd = (struct ipath_filedata *) fp->private_data;
      fp->private_data = NULL;
      pd = fd->pd;
      if (!pd) {
            mutex_unlock(&ipath_mutex);
            goto bail;
      }

      dd = pd->port_dd;

      /* drain user sdma queue */
      ipath_user_sdma_queue_drain(dd, fd->pq);
      ipath_user_sdma_queue_destroy(fd->pq);

      if (--pd->port_cnt) {
            /*
             * XXX If the master closes the port before the slave(s),
             * revoke the mmap for the eager receive queue so
             * the slave(s) don't wait for receive data forever.
             */
            pd->active_slaves &= ~(1 << fd->subport);
            put_pid(pd->port_subpid[fd->subport]);
            pd->port_subpid[fd->subport] = NULL;
            mutex_unlock(&ipath_mutex);
            goto bail;
      }
      /* early; no interrupt users after this */
      spin_lock_irqsave(&dd->ipath_uctxt_lock, flags);
      port = pd->port_port;
      dd->ipath_pd[port] = NULL;
      pid = pd->port_pid;
      pd->port_pid = NULL;
      spin_unlock_irqrestore(&dd->ipath_uctxt_lock, flags);

      if (pd->port_rcvwait_to || pd->port_piowait_to
          || pd->port_rcvnowait || pd->port_pionowait) {
            ipath_cdbg(VERBOSE, "port%u, %u rcv, %u pio wait timeo; "
                     "%u rcv %u, pio already\n",
                     pd->port_port, pd->port_rcvwait_to,
                     pd->port_piowait_to, pd->port_rcvnowait,
                     pd->port_pionowait);
            pd->port_rcvwait_to = pd->port_piowait_to =
                  pd->port_rcvnowait = pd->port_pionowait = 0;
      }
      if (pd->port_flag) {
            ipath_cdbg(PROC, "port %u port_flag set: 0x%lx\n",
                    pd->port_port, pd->port_flag);
            pd->port_flag = 0;
      }

      if (dd->ipath_kregbase) {
            /* atomically clear receive enable port and intr avail. */
            clear_bit(dd->ipath_r_portenable_shift + port,
                    &dd->ipath_rcvctrl);
            clear_bit(pd->port_port + dd->ipath_r_intravail_shift,
                    &dd->ipath_rcvctrl);
            ipath_write_kreg( dd, dd->ipath_kregs->kr_rcvctrl,
                  dd->ipath_rcvctrl);
            /* and read back from chip to be sure that nothing
             * else is in flight when we do the rest */
            (void)ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);

            /* clean up the pkeys for this port user */
            ipath_clean_part_key(pd, dd);
            /*
             * be paranoid, and never write 0's to these, just use an
             * unused part of the port 0 tail page.  Of course,
             * rcvhdraddr points to a large chunk of memory, so this
             * could still trash things, but at least it won't trash
             * page 0, and by disabling the port, it should stop "soon",
             * even if a packet or two is in already in flight after we
             * disabled the port.
             */
            ipath_write_kreg_port(dd,
                    dd->ipath_kregs->kr_rcvhdrtailaddr, port,
                  dd->ipath_dummy_hdrq_phys);
            ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdraddr,
                  pd->port_port, dd->ipath_dummy_hdrq_phys);

            ipath_disarm_piobufs(dd, pd->port_pio_base, pd->port_piocnt);
            ipath_chg_pioavailkernel(dd, pd->port_pio_base,
                  pd->port_piocnt, 1);

            dd->ipath_f_clear_tids(dd, pd->port_port);

            if (dd->ipath_pageshadow)
                  unlock_expected_tids(pd);
            ipath_stats.sps_ports--;
            ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n",
                     pd->port_comm, pid_nr(pid),
                     dd->ipath_unit, port);
      }

      put_pid(pid);
      mutex_unlock(&ipath_mutex);
      ipath_free_pddata(dd, pd); /* after releasing the mutex */

bail:
      kfree(fd);
      return ret;
}

static int ipath_port_info(struct ipath_portdata *pd, u16 subport,
                     struct ipath_port_info __user *uinfo)
{
      struct ipath_port_info info;
      int nup;
      int ret;
      size_t sz;

      (void) ipath_count_units(NULL, &nup, NULL);
      info.num_active = nup;
      info.unit = pd->port_dd->ipath_unit;
      info.port = pd->port_port;
      info.subport = subport;
      /* Don't return new fields if old library opened the port. */
      if (ipath_supports_subports(pd->userversion >> 16,
                            pd->userversion & 0xffff)) {
            /* Number of user ports available for this device. */
            info.num_ports = pd->port_dd->ipath_cfgports - 1;
            info.num_subports = pd->port_subport_cnt;
            sz = sizeof(info);
      } else
            sz = sizeof(info) - 2 * sizeof(u16);

      if (copy_to_user(uinfo, &info, sz)) {
            ret = -EFAULT;
            goto bail;
      }
      ret = 0;

bail:
      return ret;
}

static int ipath_get_slave_info(struct ipath_portdata *pd,
                        void __user *slave_mask_addr)
{
      int ret = 0;

      if (copy_to_user(slave_mask_addr, &pd->active_slaves, sizeof(u32)))
            ret = -EFAULT;
      return ret;
}

static int ipath_sdma_get_inflight(struct ipath_user_sdma_queue *pq,
                           u32 __user *inflightp)
{
      const u32 val = ipath_user_sdma_inflight_counter(pq);

      if (put_user(val, inflightp))
            return -EFAULT;

      return 0;
}

static int ipath_sdma_get_complete(struct ipath_devdata *dd,
                           struct ipath_user_sdma_queue *pq,
                           u32 __user *completep)
{
      u32 val;
      int err;

      err = ipath_user_sdma_make_progress(dd, pq);
      if (err < 0)
            return err;

      val = ipath_user_sdma_complete_counter(pq);
      if (put_user(val, completep))
            return -EFAULT;

      return 0;
}

static ssize_t ipath_write(struct file *fp, const char __user *data,
                     size_t count, loff_t *off)
{
      const struct ipath_cmd __user *ucmd;
      struct ipath_portdata *pd;
      const void __user *src;
      size_t consumed, copy;
      struct ipath_cmd cmd;
      ssize_t ret = 0;
      void *dest;

      if (count < sizeof(cmd.type)) {
            ret = -EINVAL;
            goto bail;
      }

      ucmd = (const struct ipath_cmd __user *) data;

      if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) {
            ret = -EFAULT;
            goto bail;
      }

      consumed = sizeof(cmd.type);

      switch (cmd.type) {
      case IPATH_CMD_ASSIGN_PORT:
      case __IPATH_CMD_USER_INIT:
      case IPATH_CMD_USER_INIT:
            copy = sizeof(cmd.cmd.user_info);
            dest = &cmd.cmd.user_info;
            src = &ucmd->cmd.user_info;
            break;
      case IPATH_CMD_RECV_CTRL:
            copy = sizeof(cmd.cmd.recv_ctrl);
            dest = &cmd.cmd.recv_ctrl;
            src = &ucmd->cmd.recv_ctrl;
            break;
      case IPATH_CMD_PORT_INFO:
            copy = sizeof(cmd.cmd.port_info);
            dest = &cmd.cmd.port_info;
            src = &ucmd->cmd.port_info;
            break;
      case IPATH_CMD_TID_UPDATE:
      case IPATH_CMD_TID_FREE:
            copy = sizeof(cmd.cmd.tid_info);
            dest = &cmd.cmd.tid_info;
            src = &ucmd->cmd.tid_info;
            break;
      case IPATH_CMD_SET_PART_KEY:
            copy = sizeof(cmd.cmd.part_key);
            dest = &cmd.cmd.part_key;
            src = &ucmd->cmd.part_key;
            break;
      case __IPATH_CMD_SLAVE_INFO:
            copy = sizeof(cmd.cmd.slave_mask_addr);
            dest = &cmd.cmd.slave_mask_addr;
            src = &ucmd->cmd.slave_mask_addr;
            break;
      case IPATH_CMD_PIOAVAILUPD:   // force an update of PIOAvail reg
            copy = 0;
            src = NULL;
            dest = NULL;
            break;
      case IPATH_CMD_POLL_TYPE:
            copy = sizeof(cmd.cmd.poll_type);
            dest = &cmd.cmd.poll_type;
            src = &ucmd->cmd.poll_type;
            break;
      case IPATH_CMD_ARMLAUNCH_CTRL:
            copy = sizeof(cmd.cmd.armlaunch_ctrl);
            dest = &cmd.cmd.armlaunch_ctrl;
            src = &ucmd->cmd.armlaunch_ctrl;
            break;
      case IPATH_CMD_SDMA_INFLIGHT:
            copy = sizeof(cmd.cmd.sdma_inflight);
            dest = &cmd.cmd.sdma_inflight;
            src = &ucmd->cmd.sdma_inflight;
            break;
      case IPATH_CMD_SDMA_COMPLETE:
            copy = sizeof(cmd.cmd.sdma_complete);
            dest = &cmd.cmd.sdma_complete;
            src = &ucmd->cmd.sdma_complete;
            break;
      default:
            ret = -EINVAL;
            goto bail;
      }

      if (copy) {
            if ((count - consumed) < copy) {
                  ret = -EINVAL;
                  goto bail;
            }

            if (copy_from_user(dest, src, copy)) {
                  ret = -EFAULT;
                  goto bail;
            }

            consumed += copy;
      }

      pd = port_fp(fp);
      if (!pd && cmd.type != __IPATH_CMD_USER_INIT &&
            cmd.type != IPATH_CMD_ASSIGN_PORT) {
            ret = -EINVAL;
            goto bail;
      }

      switch (cmd.type) {
      case IPATH_CMD_ASSIGN_PORT:
            ret = ipath_assign_port(fp, &cmd.cmd.user_info);
            if (ret)
                  goto bail;
            break;
      case __IPATH_CMD_USER_INIT:
            /* backwards compatibility, get port first */
            ret = ipath_assign_port(fp, &cmd.cmd.user_info);
            if (ret)
                  goto bail;
            /* and fall through to current version. */
      case IPATH_CMD_USER_INIT:
            ret = ipath_do_user_init(fp, &cmd.cmd.user_info);
            if (ret)
                  goto bail;
            ret = ipath_get_base_info(
                  fp, (void __user *) (unsigned long)
                  cmd.cmd.user_info.spu_base_info,
                  cmd.cmd.user_info.spu_base_info_size);
            break;
      case IPATH_CMD_RECV_CTRL:
            ret = ipath_manage_rcvq(pd, subport_fp(fp), cmd.cmd.recv_ctrl);
            break;
      case IPATH_CMD_PORT_INFO:
            ret = ipath_port_info(pd, subport_fp(fp),
                              (struct ipath_port_info __user *)
                              (unsigned long) cmd.cmd.port_info);
            break;
      case IPATH_CMD_TID_UPDATE:
            ret = ipath_tid_update(pd, fp, &cmd.cmd.tid_info);
            break;
      case IPATH_CMD_TID_FREE:
            ret = ipath_tid_free(pd, subport_fp(fp), &cmd.cmd.tid_info);
            break;
      case IPATH_CMD_SET_PART_KEY:
            ret = ipath_set_part_key(pd, cmd.cmd.part_key);
            break;
      case __IPATH_CMD_SLAVE_INFO:
            ret = ipath_get_slave_info(pd,
                                 (void __user *) (unsigned long)
                                 cmd.cmd.slave_mask_addr);
            break;
      case IPATH_CMD_PIOAVAILUPD:
            ipath_force_pio_avail_update(pd->port_dd);
            break;
      case IPATH_CMD_POLL_TYPE:
            pd->poll_type = cmd.cmd.poll_type;
            break;
      case IPATH_CMD_ARMLAUNCH_CTRL:
            if (cmd.cmd.armlaunch_ctrl)
                  ipath_enable_armlaunch(pd->port_dd);
            else
                  ipath_disable_armlaunch(pd->port_dd);
            break;
      case IPATH_CMD_SDMA_INFLIGHT:
            ret = ipath_sdma_get_inflight(user_sdma_queue_fp(fp),
                                    (u32 __user *) (unsigned long)
                                    cmd.cmd.sdma_inflight);
            break;
      case IPATH_CMD_SDMA_COMPLETE:
            ret = ipath_sdma_get_complete(pd->port_dd,
                                    user_sdma_queue_fp(fp),
                                    (u32 __user *) (unsigned long)
                                    cmd.cmd.sdma_complete);
            break;
      }

      if (ret >= 0)
            ret = consumed;

bail:
      return ret;
}

static ssize_t ipath_writev(struct kiocb *iocb, const struct iovec *iov,
                      unsigned long dim, loff_t off)
{
      struct file *filp = iocb->ki_filp;
      struct ipath_filedata *fp = filp->private_data;
      struct ipath_portdata *pd = port_fp(filp);
      struct ipath_user_sdma_queue *pq = fp->pq;

      if (!dim)
            return -EINVAL;

      return ipath_user_sdma_writev(pd->port_dd, pq, iov, dim);
}

static struct class *ipath_class;

static int init_cdev(int minor, char *name, const struct file_operations *fops,
                 struct cdev **cdevp, struct device **devp)
{
      const dev_t dev = MKDEV(IPATH_MAJOR, minor);
      struct cdev *cdev = NULL;
      struct device *device = NULL;
      int ret;

      cdev = cdev_alloc();
      if (!cdev) {
            printk(KERN_ERR IPATH_DRV_NAME
                   ": Could not allocate cdev for minor %d, %s\n",
                   minor, name);
            ret = -ENOMEM;
            goto done;
      }

      cdev->owner = THIS_MODULE;
      cdev->ops = fops;
      kobject_set_name(&cdev->kobj, name);

      ret = cdev_add(cdev, dev, 1);
      if (ret < 0) {
            printk(KERN_ERR IPATH_DRV_NAME
                   ": Could not add cdev for minor %d, %s (err %d)\n",
                   minor, name, -ret);
            goto err_cdev;
      }

      device = device_create(ipath_class, NULL, dev, NULL, name);

      if (IS_ERR(device)) {
            ret = PTR_ERR(device);
            printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
                   "device for minor %d, %s (err %d)\n",
                   minor, name, -ret);
            goto err_cdev;
      }

      goto done;

err_cdev:
      cdev_del(cdev);
      cdev = NULL;

done:
      if (ret >= 0) {
            *cdevp = cdev;
            *devp = device;
      } else {
            *cdevp = NULL;
            *devp = NULL;
      }

      return ret;
}

int ipath_cdev_init(int minor, char *name, const struct file_operations *fops,
                struct cdev **cdevp, struct device **devp)
{
      return init_cdev(minor, name, fops, cdevp, devp);
}

static void cleanup_cdev(struct cdev **cdevp,
                   struct device **devp)
{
      struct device *dev = *devp;

      if (dev) {
            device_unregister(dev);
            *devp = NULL;
      }

      if (*cdevp) {
            cdev_del(*cdevp);
            *cdevp = NULL;
      }
}

void ipath_cdev_cleanup(struct cdev **cdevp,
                  struct device **devp)
{
      cleanup_cdev(cdevp, devp);
}

static struct cdev *wildcard_cdev;
static struct device *wildcard_dev;

static const dev_t dev = MKDEV(IPATH_MAJOR, 0);

static int user_init(void)
{
      int ret;

      ret = register_chrdev_region(dev, IPATH_NMINORS, IPATH_DRV_NAME);
      if (ret < 0) {
            printk(KERN_ERR IPATH_DRV_NAME ": Could not register "
                   "chrdev region (err %d)\n", -ret);
            goto done;
      }

      ipath_class = class_create(THIS_MODULE, IPATH_DRV_NAME);

      if (IS_ERR(ipath_class)) {
            ret = PTR_ERR(ipath_class);
            printk(KERN_ERR IPATH_DRV_NAME ": Could not create "
                   "device class (err %d)\n", -ret);
            goto bail;
      }

      goto done;
bail:
      unregister_chrdev_region(dev, IPATH_NMINORS);
done:
      return ret;
}

static void user_cleanup(void)
{
      if (ipath_class) {
            class_destroy(ipath_class);
            ipath_class = NULL;
      }

      unregister_chrdev_region(dev, IPATH_NMINORS);
}

static atomic_t user_count = ATOMIC_INIT(0);
static atomic_t user_setup = ATOMIC_INIT(0);

int ipath_user_add(struct ipath_devdata *dd)
{
      char name[10];
      int ret;

      if (atomic_inc_return(&user_count) == 1) {
            ret = user_init();
            if (ret < 0) {
                  ipath_dev_err(dd, "Unable to set up user support: "
                              "error %d\n", -ret);
                  goto bail;
            }
            ret = init_cdev(0, "ipath", &ipath_file_ops, &wildcard_cdev,
                        &wildcard_dev);
            if (ret < 0) {
                  ipath_dev_err(dd, "Could not create wildcard "
                              "minor: error %d\n", -ret);
                  goto bail_user;
            }

            atomic_set(&user_setup, 1);
      }

      snprintf(name, sizeof(name), "ipath%d", dd->ipath_unit);

      ret = init_cdev(dd->ipath_unit + 1, name, &ipath_file_ops,
                  &dd->user_cdev, &dd->user_dev);
      if (ret < 0)
            ipath_dev_err(dd, "Could not create user minor %d, %s\n",
                        dd->ipath_unit + 1, name);

      goto bail;

bail_user:
      user_cleanup();
bail:
      return ret;
}

void ipath_user_remove(struct ipath_devdata *dd)
{
      cleanup_cdev(&dd->user_cdev, &dd->user_dev);

      if (atomic_dec_return(&user_count) == 0) {
            if (atomic_read(&user_setup) == 0)
                  goto bail;

            cleanup_cdev(&wildcard_cdev, &wildcard_dev);
            user_cleanup();

            atomic_set(&user_setup, 0);
      }
bail:
      return;
}

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