IB/qib: Add new qib driver for QLogic PCIe InfiniBand adapters

Add a low-level IB driver for QLogic PCIe adapters.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 665 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/qib/qib_driver.c b/drivers/infiniband/hw/qib/qib_driver.c
new file mode 100644
index 000000000000..f15ce076ac49
--- /dev/null
+++ b/drivers/infiniband/hw/qib/qib_driver.c
@@ -0,0 +1,665 @@
+/*
+ * Copyright (c) 2006, 2007, 2008, 2009 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/spinlock.h>
+#include <linux/pci.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/vmalloc.h>
+
+#include "qib.h"
+
+/*
+ * The size has to be longer than this string, so we can append
+ * board/chip information to it in the init code.
+ */
+const char ib_qib_version[] = QIB_IDSTR "\n";
+
+DEFINE_SPINLOCK(qib_devs_lock);
+LIST_HEAD(qib_dev_list);
+DEFINE_MUTEX(qib_mutex);        /* general driver use */
+
+unsigned qib_ibmtu;
+module_param_named(ibmtu, qib_ibmtu, uint, S_IRUGO);
+MODULE_PARM_DESC(ibmtu, "Set max IB MTU (0=2KB, 1=256, 2=512, ... 5=4096");
+
+unsigned qib_compat_ddr_negotiate = 1;
+module_param_named(compat_ddr_negotiate, qib_compat_ddr_negotiate, uint,
+                   S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(compat_ddr_negotiate,
+                 "Attempt pre-IBTA 1.2 DDR speed negotiation");
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("QLogic <support@qlogic.com>");
+MODULE_DESCRIPTION("QLogic IB driver");
+
+/*
+ * QIB_PIO_MAXIBHDR is the max IB header size allowed for in our
+ * PIO send buffers.  This is well beyond anything currently
+ * defined in the InfiniBand spec.
+ */
+#define QIB_PIO_MAXIBHDR 128
+
+struct qlogic_ib_stats qib_stats;
+
+const char *qib_get_unit_name(int unit)
+{
+        static char iname[16];
+
+        snprintf(iname, sizeof iname, "infinipath%u", unit);
+        return iname;
+}
+
+/*
+ * Return count of units with at least one port ACTIVE.
+ */
+int qib_count_active_units(void)
+{
+        struct qib_devdata *dd;
+        struct qib_pportdata *ppd;
+        unsigned long flags;
+        int pidx, nunits_active = 0;
+
+        spin_lock_irqsave(&qib_devs_lock, flags);
+        list_for_each_entry(dd, &qib_dev_list, list) {
+                if (!(dd->flags & QIB_PRESENT) || !dd->kregbase)
+                        continue;
+                for (pidx = 0; pidx < dd->num_pports; ++pidx) {
+                        ppd = dd->pport + pidx;
+                        if (ppd->lid && (ppd->lflags & (QIBL_LINKINIT |
+                                         QIBL_LINKARMED | QIBL_LINKACTIVE))) {
+                                nunits_active++;
+                                break;
+                        }
+                }
+        }
+        spin_unlock_irqrestore(&qib_devs_lock, flags);
+        return nunits_active;
+}
+
+/*
+ * Return count of all units, optionally return in arguments
+ * the number of usable (present) units, and the number of
+ * ports that are up.
+ */
+int qib_count_units(int *npresentp, int *nupp)
+{
+        int nunits = 0, npresent = 0, nup = 0;
+        struct qib_devdata *dd;
+        unsigned long flags;
+        int pidx;
+        struct qib_pportdata *ppd;
+
+        spin_lock_irqsave(&qib_devs_lock, flags);
+
+        list_for_each_entry(dd, &qib_dev_list, list) {
+                nunits++;
+                if ((dd->flags & QIB_PRESENT) && dd->kregbase)
+                        npresent++;
+                for (pidx = 0; pidx < dd->num_pports; ++pidx) {
+                        ppd = dd->pport + pidx;
+                        if (ppd->lid && (ppd->lflags & (QIBL_LINKINIT |
+                                         QIBL_LINKARMED | QIBL_LINKACTIVE)))
+                                nup++;
+                }
+        }
+
+        spin_unlock_irqrestore(&qib_devs_lock, flags);
+
+        if (npresentp)
+                *npresentp = npresent;
+        if (nupp)
+                *nupp = nup;
+
+        return nunits;
+}
+
+/**
+ * qib_wait_linkstate - wait for an IB link state change to occur
+ * @dd: the qlogic_ib device
+ * @state: the state to wait for
+ * @msecs: the number of milliseconds to wait
+ *
+ * wait up to msecs milliseconds for IB link state change to occur for
+ * now, take the easy polling route.  Currently used only by
+ * qib_set_linkstate.  Returns 0 if state reached, otherwise
+ * -ETIMEDOUT state can have multiple states set, for any of several
+ * transitions.
+ */
+int qib_wait_linkstate(struct qib_pportdata *ppd, u32 state, int msecs)
+{
+        int ret;
+        unsigned long flags;
+
+        spin_lock_irqsave(&ppd->lflags_lock, flags);
+        if (ppd->state_wanted) {
+                spin_unlock_irqrestore(&ppd->lflags_lock, flags);
+                ret = -EBUSY;
+                goto bail;
+        }
+        ppd->state_wanted = state;
+        spin_unlock_irqrestore(&ppd->lflags_lock, flags);
+        wait_event_interruptible_timeout(ppd->state_wait,
+                                         (ppd->lflags & state),
+                                         msecs_to_jiffies(msecs));
+        spin_lock_irqsave(&ppd->lflags_lock, flags);
+        ppd->state_wanted = 0;
+        spin_unlock_irqrestore(&ppd->lflags_lock, flags);
+
+        if (!(ppd->lflags & state))
+                ret = -ETIMEDOUT;
+        else
+                ret = 0;
+bail:
+        return ret;
+}
+
+int qib_set_linkstate(struct qib_pportdata *ppd, u8 newstate)
+{
+        u32 lstate;
+        int ret;
+        struct qib_devdata *dd = ppd->dd;
+        unsigned long flags;
+
+        switch (newstate) {
+        case QIB_IB_LINKDOWN_ONLY:
+                dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LSTATE,
+                                 IB_LINKCMD_DOWN | IB_LINKINITCMD_NOP);
+                /* don't wait */
+                ret = 0;
+                goto bail;
+
+        case QIB_IB_LINKDOWN:
+                dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LSTATE,
+                                 IB_LINKCMD_DOWN | IB_LINKINITCMD_POLL);
+                /* don't wait */
+                ret = 0;
+                goto bail;
+
+        case QIB_IB_LINKDOWN_SLEEP:
+                dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LSTATE,
+                                 IB_LINKCMD_DOWN | IB_LINKINITCMD_SLEEP);
+                /* don't wait */
+                ret = 0;
+                goto bail;
+
+        case QIB_IB_LINKDOWN_DISABLE:
+                dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LSTATE,
+                                 IB_LINKCMD_DOWN | IB_LINKINITCMD_DISABLE);
+                /* don't wait */
+                ret = 0;
+                goto bail;
+
+        case QIB_IB_LINKARM:
+                if (ppd->lflags & QIBL_LINKARMED) {
+                        ret = 0;
+                        goto bail;
+                }
+                if (!(ppd->lflags & (QIBL_LINKINIT | QIBL_LINKACTIVE))) {
+                        ret = -EINVAL;
+                        goto bail;
+                }
+                /*
+                 * Since the port can be ACTIVE when we ask for ARMED,
+                 * clear QIBL_LINKV so we can wait for a transition.
+                 * If the link isn't ARMED, then something else happened
+                 * and there is no point waiting for ARMED.
+                 */
+                spin_lock_irqsave(&ppd->lflags_lock, flags);
+                ppd->lflags &= ~QIBL_LINKV;
+                spin_unlock_irqrestore(&ppd->lflags_lock, flags);
+                dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LSTATE,
+                                 IB_LINKCMD_ARMED | IB_LINKINITCMD_NOP);
+                lstate = QIBL_LINKV;
+                break;
+
+        case QIB_IB_LINKACTIVE:
+                if (ppd->lflags & QIBL_LINKACTIVE) {
+                        ret = 0;
+                        goto bail;
+                }
+                if (!(ppd->lflags & QIBL_LINKARMED)) {
+                        ret = -EINVAL;
+                        goto bail;
+                }
+                dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LSTATE,
+                                 IB_LINKCMD_ACTIVE | IB_LINKINITCMD_NOP);
+                lstate = QIBL_LINKACTIVE;
+                break;
+
+        default:
+                ret = -EINVAL;
+                goto bail;
+        }
+        ret = qib_wait_linkstate(ppd, lstate, 10);
+
+bail:
+        return ret;
+}
+
+/*
+ * Get address of eager buffer from it's index (allocated in chunks, not
+ * contiguous).
+ */
+static inline void *qib_get_egrbuf(const struct qib_ctxtdata *rcd, u32 etail)
+{
+        const u32 chunk = etail / rcd->rcvegrbufs_perchunk;
+        const u32 idx =  etail % rcd->rcvegrbufs_perchunk;
+
+        return rcd->rcvegrbuf[chunk] + idx * rcd->dd->rcvegrbufsize;
+}
+
+/*
+ * Returns 1 if error was a CRC, else 0.
+ * Needed for some chip's synthesized error counters.
+ */
+static u32 qib_rcv_hdrerr(struct qib_pportdata *ppd, u32 ctxt,
+                          u32 eflags, u32 l, u32 etail, __le32 *rhf_addr,
+                          struct qib_message_header *hdr)
+{
+        u32 ret = 0;
+
+        if (eflags & (QLOGIC_IB_RHF_H_ICRCERR | QLOGIC_IB_RHF_H_VCRCERR))
+                ret = 1;
+        return ret;
+}
+
+/*
+ * qib_kreceive - receive a packet
+ * @rcd: the qlogic_ib context
+ * @llic: gets count of good packets needed to clear lli,
+ *          (used with chips that need need to track crcs for lli)
+ *
+ * called from interrupt handler for errors or receive interrupt
+ * Returns number of CRC error packets, needed by some chips for
+ * local link integrity tracking.   crcs are adjusted down by following
+ * good packets, if any, and count of good packets is also tracked.
+ */
+u32 qib_kreceive(struct qib_ctxtdata *rcd, u32 *llic, u32 *npkts)
+{
+        struct qib_devdata *dd = rcd->dd;
+        struct qib_pportdata *ppd = rcd->ppd;
+        __le32 *rhf_addr;
+        void *ebuf;
+        const u32 rsize = dd->rcvhdrentsize;        /* words */
+        const u32 maxcnt = dd->rcvhdrcnt * rsize;   /* words */
+        u32 etail = -1, l, hdrqtail;
+        struct qib_message_header *hdr;
+        u32 eflags, etype, tlen, i = 0, updegr = 0, crcs = 0;
+        int last;
+        u64 lval;
+        struct qib_qp *qp, *nqp;
+
+        l = rcd->head;
+        rhf_addr = (__le32 *) rcd->rcvhdrq + l + dd->rhf_offset;
+        if (dd->flags & QIB_NODMA_RTAIL) {
+                u32 seq = qib_hdrget_seq(rhf_addr);
+                if (seq != rcd->seq_cnt)
+                        goto bail;
+                hdrqtail = 0;
+        } else {
+                hdrqtail = qib_get_rcvhdrtail(rcd);
+                if (l == hdrqtail)
+                        goto bail;
+                smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
+        }
+
+        for (last = 0, i = 1; !last; i += !last) {
+                hdr = dd->f_get_msgheader(dd, rhf_addr);
+                eflags = qib_hdrget_err_flags(rhf_addr);
+                etype = qib_hdrget_rcv_type(rhf_addr);
+                /* total length */
+                tlen = qib_hdrget_length_in_bytes(rhf_addr);
+                ebuf = NULL;
+                if ((dd->flags & QIB_NODMA_RTAIL) ?
+                    qib_hdrget_use_egr_buf(rhf_addr) :
+                    (etype != RCVHQ_RCV_TYPE_EXPECTED)) {
+                        etail = qib_hdrget_index(rhf_addr);
+                        updegr = 1;
+                        if (tlen > sizeof(*hdr) ||
+                            etype >= RCVHQ_RCV_TYPE_NON_KD)
+                                ebuf = qib_get_egrbuf(rcd, etail);
+                }
+                if (!eflags) {
+                        u16 lrh_len = be16_to_cpu(hdr->lrh[2]) << 2;
+
+                        if (lrh_len != tlen) {
+                                qib_stats.sps_lenerrs++;
+                                goto move_along;
+                        }
+                }
+                if (etype == RCVHQ_RCV_TYPE_NON_KD && !eflags &&
+                    ebuf == NULL &&
+                    tlen > (dd->rcvhdrentsize - 2 + 1 -
+                                qib_hdrget_offset(rhf_addr)) << 2) {
+                        goto move_along;
+                }
+
+                /*
+                 * Both tiderr and qibhdrerr are set for all plain IB
+                 * packets; only qibhdrerr should be set.
+                 */
+                if (unlikely(eflags))
+                        crcs += qib_rcv_hdrerr(ppd, rcd->ctxt, eflags, l,
+                                               etail, rhf_addr, hdr);
+                else if (etype == RCVHQ_RCV_TYPE_NON_KD) {
+                        qib_ib_rcv(rcd, hdr, ebuf, tlen);
+                        if (crcs)
+                                crcs--;
+                        else if (llic && *llic)
+                                --*llic;
+                }
+move_along:
+                l += rsize;
+                if (l >= maxcnt)
+                        l = 0;
+                rhf_addr = (__le32 *) rcd->rcvhdrq + l + dd->rhf_offset;
+                if (dd->flags & QIB_NODMA_RTAIL) {
+                        u32 seq = qib_hdrget_seq(rhf_addr);
+
+                        if (++rcd->seq_cnt > 13)
+                                rcd->seq_cnt = 1;
+                        if (seq != rcd->seq_cnt)
+                                last = 1;
+                } else if (l == hdrqtail)
+                        last = 1;
+                /*
+                 * Update head regs etc., every 16 packets, if not last pkt,
+                 * to help prevent rcvhdrq overflows, when many packets
+                 * are processed and queue is nearly full.
+                 * Don't request an interrupt for intermediate updates.
+                 */
+                lval = l;
+                if (!last && !(i & 0xf)) {
+                        dd->f_update_usrhead(rcd, lval, updegr, etail);
+                        updegr = 0;
+                }
+        }
+
+        rcd->head = l;
+        rcd->pkt_count += i;
+
+        /*
+         * Iterate over all QPs waiting to respond.
+         * The list won't change since the IRQ is only run on one CPU.
+         */
+        list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) {
+                list_del_init(&qp->rspwait);
+                if (qp->r_flags & QIB_R_RSP_NAK) {
+                        qp->r_flags &= ~QIB_R_RSP_NAK;
+                        qib_send_rc_ack(qp);
+                }
+                if (qp->r_flags & QIB_R_RSP_SEND) {
+                        unsigned long flags;
+
+                        qp->r_flags &= ~QIB_R_RSP_SEND;
+                        spin_lock_irqsave(&qp->s_lock, flags);
+                        if (ib_qib_state_ops[qp->state] &
+                                        QIB_PROCESS_OR_FLUSH_SEND)
+                                qib_schedule_send(qp);
+                        spin_unlock_irqrestore(&qp->s_lock, flags);
+                }
+                if (atomic_dec_and_test(&qp->refcount))
+                        wake_up(&qp->wait);
+        }
+
+bail:
+        /* Report number of packets consumed */
+        if (npkts)
+                *npkts = i;
+
+        /*
+         * Always write head at end, and setup rcv interrupt, even
+         * if no packets were processed.
+         */
+        lval = (u64)rcd->head | dd->rhdrhead_intr_off;
+        dd->f_update_usrhead(rcd, lval, updegr, etail);
+        return crcs;
+}
+
+/**
+ * qib_set_mtu - set the MTU
+ * @ppd: the perport data
+ * @arg: the new MTU
+ *
+ * We can handle "any" incoming size, the issue here is whether we
+ * need to restrict our outgoing size.   For now, we don't do any
+ * sanity checking on this, and we don't deal with what happens to
+ * programs that are already running when the size changes.
+ * NOTE: changing the MTU will usually cause the IBC to go back to
+ * link INIT state...
+ */
+int qib_set_mtu(struct qib_pportdata *ppd, u16 arg)
+{
+        u32 piosize;
+        int ret, chk;
+
+        if (arg != 256 && arg != 512 && arg != 1024 && arg != 2048 &&
+            arg != 4096) {
+                ret = -EINVAL;
+                goto bail;
+        }
+        chk = ib_mtu_enum_to_int(qib_ibmtu);
+        if (chk > 0 && arg > chk) {
+                ret = -EINVAL;
+                goto bail;
+        }
+
+        piosize = ppd->ibmaxlen;
+        ppd->ibmtu = arg;
+
+        if (arg >= (piosize - QIB_PIO_MAXIBHDR)) {
+                /* Only if it's not the initial value (or reset to it) */
+                if (piosize != ppd->init_ibmaxlen) {
+                        if (arg > piosize && arg <= ppd->init_ibmaxlen)
+                                piosize = ppd->init_ibmaxlen - 2 * sizeof(u32);
+                        ppd->ibmaxlen = piosize;
+                }
+        } else if ((arg + QIB_PIO_MAXIBHDR) != ppd->ibmaxlen) {
+                piosize = arg + QIB_PIO_MAXIBHDR - 2 * sizeof(u32);
+                ppd->ibmaxlen = piosize;
+        }
+
+        ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_MTU, 0);
+
+        ret = 0;
+
+bail:
+        return ret;
+}
+
+int qib_set_lid(struct qib_pportdata *ppd, u32 lid, u8 lmc)
+{
+        struct qib_devdata *dd = ppd->dd;
+        ppd->lid = lid;
+        ppd->lmc = lmc;
+
+        dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LIDLMC,
+                         lid | (~((1U << lmc) - 1)) << 16);
+
+        qib_devinfo(dd->pcidev, "IB%u:%u got a lid: 0x%x\n",
+                    dd->unit, ppd->port, lid);
+
+        return 0;
+}
+
+/*
+ * Following deal with the "obviously simple" task of overriding the state
+ * of the LEDS, which normally indicate link physical and logical status.
+ * The complications arise in dealing with different hardware mappings
+ * and the board-dependent routine being called from interrupts.
+ * and then there's the requirement to _flash_ them.
+ */
+#define LED_OVER_FREQ_SHIFT 8
+#define LED_OVER_FREQ_MASK (0xFF<<LED_OVER_FREQ_SHIFT)
+/* Below is "non-zero" to force override, but both actual LEDs are off */
+#define LED_OVER_BOTH_OFF (8)
+
+static void qib_run_led_override(unsigned long opaque)
+{
+        struct qib_pportdata *ppd = (struct qib_pportdata *)opaque;
+        struct qib_devdata *dd = ppd->dd;
+        int timeoff;
+        int ph_idx;
+
+        if (!(dd->flags & QIB_INITTED))
+                return;
+
+        ph_idx = ppd->led_override_phase++ & 1;
+        ppd->led_override = ppd->led_override_vals[ph_idx];
+        timeoff = ppd->led_override_timeoff;
+
+        dd->f_setextled(ppd, 1);
+        /*
+         * don't re-fire the timer if user asked for it to be off; we let
+         * it fire one more time after they turn it off to simplify
+         */
+        if (ppd->led_override_vals[0] || ppd->led_override_vals[1])
+                mod_timer(&ppd->led_override_timer, jiffies + timeoff);
+}
+
+void qib_set_led_override(struct qib_pportdata *ppd, unsigned int val)
+{
+        struct qib_devdata *dd = ppd->dd;
+        int timeoff, freq;
+
+        if (!(dd->flags & QIB_INITTED))
+                return;
+
+        /* First check if we are blinking. If not, use 1HZ polling */
+        timeoff = HZ;
+        freq = (val & LED_OVER_FREQ_MASK) >> LED_OVER_FREQ_SHIFT;
+
+        if (freq) {
+                /* For blink, set each phase from one nybble of val */
+                ppd->led_override_vals[0] = val & 0xF;
+                ppd->led_override_vals[1] = (val >> 4) & 0xF;
+                timeoff = (HZ << 4)/freq;
+        } else {
+                /* Non-blink set both phases the same. */
+                ppd->led_override_vals[0] = val & 0xF;
+                ppd->led_override_vals[1] = val & 0xF;
+        }
+        ppd->led_override_timeoff = timeoff;
+
+        /*
+         * If the timer has not already been started, do so. Use a "quick"
+         * timeout so the function will be called soon, to look at our request.
+         */
+        if (atomic_inc_return(&ppd->led_override_timer_active) == 1) {
+                /* Need to start timer */
+                init_timer(&ppd->led_override_timer);
+                ppd->led_override_timer.function = qib_run_led_override;
+                ppd->led_override_timer.data = (unsigned long) ppd;
+                ppd->led_override_timer.expires = jiffies + 1;
+                add_timer(&ppd->led_override_timer);
+        } else {
+                if (ppd->led_override_vals[0] || ppd->led_override_vals[1])
+                        mod_timer(&ppd->led_override_timer, jiffies + 1);
+                atomic_dec(&ppd->led_override_timer_active);
+        }
+}
+
+/**
+ * qib_reset_device - reset the chip if possible
+ * @unit: the device to reset
+ *
+ * Whether or not reset is successful, we attempt to re-initialize the chip
+ * (that is, much like a driver unload/reload).  We clear the INITTED flag
+ * so that the various entry points will fail until we reinitialize.  For
+ * now, we only allow this if no user contexts are open that use chip resources
+ */
+int qib_reset_device(int unit)
+{
+        int ret, i;
+        struct qib_devdata *dd = qib_lookup(unit);
+        struct qib_pportdata *ppd;
+        unsigned long flags;
+        int pidx;
+
+        if (!dd) {
+                ret = -ENODEV;
+                goto bail;
+        }
+
+        qib_devinfo(dd->pcidev, "Reset on unit %u requested\n", unit);
+
+        if (!dd->kregbase || !(dd->flags & QIB_PRESENT)) {
+                qib_devinfo(dd->pcidev, "Invalid unit number %u or "
+                            "not initialized or not present\n", unit);
+                ret = -ENXIO;
+                goto bail;
+        }
+
+        spin_lock_irqsave(&dd->uctxt_lock, flags);
+        if (dd->rcd)
+                for (i = dd->first_user_ctxt; i < dd->cfgctxts; i++) {
+                        if (!dd->rcd[i] || !dd->rcd[i]->cnt)
+                                continue;
+                        spin_unlock_irqrestore(&dd->uctxt_lock, flags);
+                        ret = -EBUSY;
+                        goto bail;
+                }
+        spin_unlock_irqrestore(&dd->uctxt_lock, flags);
+
+        for (pidx = 0; pidx < dd->num_pports; ++pidx) {
+                ppd = dd->pport + pidx;
+                if (atomic_read(&ppd->led_override_timer_active)) {
+                        /* Need to stop LED timer, _then_ shut off LEDs */
+                        del_timer_sync(&ppd->led_override_timer);
+                        atomic_set(&ppd->led_override_timer_active, 0);
+                }
+
+                /* Shut off LEDs after we are sure timer is not running */
+                ppd->led_override = LED_OVER_BOTH_OFF;
+                dd->f_setextled(ppd, 0);
+                if (dd->flags & QIB_HAS_SEND_DMA)
+                        qib_teardown_sdma(ppd);
+        }
+
+        ret = dd->f_reset(dd);
+        if (ret == 1)
+                ret = qib_init(dd, 1);
+        else
+                ret = -EAGAIN;
+        if (ret)
+                qib_dev_err(dd, "Reinitialize unit %u after "
+                            "reset failed with %d\n", unit, ret);
+        else
+                qib_devinfo(dd->pcidev, "Reinitialized unit %u after "
+                            "resetting\n", unit);
+
+bail:
+        return ret;
+}