RDMA: Use vzalloc() to replace vmalloc()+memset(0)

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / infiniband / hw / qib / qib_init.c

/*
 * Copyright (c) 2006, 2007, 2008, 2009, 2010 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/netdevice.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/idr.h>

#include "qib.h"
#include "qib_common.h"

/*
 * min buffers we want to have per context, after driver
 */
#define QIB_MIN_USER_CTXT_BUFCNT 7

#define QLOGIC_IB_R_SOFTWARE_MASK 0xFF
#define QLOGIC_IB_R_SOFTWARE_SHIFT 24
#define QLOGIC_IB_R_EMULATOR_MASK (1ULL<<62)

/*
 * Number of ctxts we are configured to use (to allow for more pio
 * buffers per ctxt, etc.)  Zero means use chip value.
 */
ushort qib_cfgctxts;
module_param_named(cfgctxts, qib_cfgctxts, ushort, S_IRUGO);
MODULE_PARM_DESC(cfgctxts, "Set max number of contexts to use");

/*
 * If set, do not write to any regs if avoidable, hack to allow
 * check for deranged default register values.
 */
ushort qib_mini_init;
module_param_named(mini_init, qib_mini_init, ushort, S_IRUGO);
MODULE_PARM_DESC(mini_init, "If set, do minimal diag init");

unsigned qib_n_krcv_queues;
module_param_named(krcvqs, qib_n_krcv_queues, uint, S_IRUGO);
MODULE_PARM_DESC(krcvqs, "number of kernel receive queues per IB port");

/*
 * qib_wc_pat parameter:
 *      0 is WC via MTRR
 *      1 is WC via PAT
 *      If PAT initialization fails, code reverts back to MTRR
 */
unsigned qib_wc_pat = 1; /* default (1) is to use PAT, not MTRR */
module_param_named(wc_pat, qib_wc_pat, uint, S_IRUGO);
MODULE_PARM_DESC(wc_pat, "enable write-combining via PAT mechanism");

struct workqueue_struct *qib_wq;
struct workqueue_struct *qib_cq_wq;

static void verify_interrupt(unsigned long);

static struct idr qib_unit_table;
u32 qib_cpulist_count;
unsigned long *qib_cpulist;

/* set number of contexts we'll actually use */
void qib_set_ctxtcnt(struct qib_devdata *dd)
{
        if (!qib_cfgctxts) {
                dd->cfgctxts = dd->first_user_ctxt + num_online_cpus();
                if (dd->cfgctxts > dd->ctxtcnt)
                        dd->cfgctxts = dd->ctxtcnt;
        } else if (qib_cfgctxts < dd->num_pports)
                dd->cfgctxts = dd->ctxtcnt;
        else if (qib_cfgctxts <= dd->ctxtcnt)
                dd->cfgctxts = qib_cfgctxts;
        else
                dd->cfgctxts = dd->ctxtcnt;
}

/*
 * Common code for creating the receive context array.
 */
int qib_create_ctxts(struct qib_devdata *dd)
{
        unsigned i;
        int ret;

        /*
         * Allocate full ctxtcnt array, rather than just cfgctxts, because
         * cleanup iterates across all possible ctxts.
         */
        dd->rcd = kzalloc(sizeof(*dd->rcd) * dd->ctxtcnt, GFP_KERNEL);
        if (!dd->rcd) {
                qib_dev_err(dd, "Unable to allocate ctxtdata array, "
                            "failing\n");
                ret = -ENOMEM;
                goto done;
        }

        /* create (one or more) kctxt */
        for (i = 0; i < dd->first_user_ctxt; ++i) {
                struct qib_pportdata *ppd;
                struct qib_ctxtdata *rcd;

                if (dd->skip_kctxt_mask & (1 << i))
                        continue;

                ppd = dd->pport + (i % dd->num_pports);
                rcd = qib_create_ctxtdata(ppd, i);
                if (!rcd) {
                        qib_dev_err(dd, "Unable to allocate ctxtdata"
                                    " for Kernel ctxt, failing\n");
                        ret = -ENOMEM;
                        goto done;
                }
                rcd->pkeys[0] = QIB_DEFAULT_P_KEY;
                rcd->seq_cnt = 1;
        }
        ret = 0;
done:
        return ret;
}

/*
 * Common code for user and kernel context setup.
 */
struct qib_ctxtdata *qib_create_ctxtdata(struct qib_pportdata *ppd, u32 ctxt)
{
        struct qib_devdata *dd = ppd->dd;
        struct qib_ctxtdata *rcd;

        rcd = kzalloc(sizeof(*rcd), GFP_KERNEL);
        if (rcd) {
                INIT_LIST_HEAD(&rcd->qp_wait_list);
                rcd->ppd = ppd;
                rcd->dd = dd;
                rcd->cnt = 1;
                rcd->ctxt = ctxt;
                dd->rcd[ctxt] = rcd;

                dd->f_init_ctxt(rcd);

                /*
                 * 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.  32KB seems to
                 * be the most that is "safe" under memory pressure
                 * (creating large files and then copying them over
                 * NFS while doing lots of MPI jobs).  The OOM killer can
                 * get invoked, even though we say we can sleep and this can
                 * cause significant system problems....
                 */
                rcd->rcvegrbuf_size = 0x8000;
                rcd->rcvegrbufs_perchunk =
                        rcd->rcvegrbuf_size / dd->rcvegrbufsize;
                rcd->rcvegrbuf_chunks = (rcd->rcvegrcnt +
                        rcd->rcvegrbufs_perchunk - 1) /
                        rcd->rcvegrbufs_perchunk;
        }
        return rcd;
}

/*
 * Common code for initializing the physical port structure.
 */
void qib_init_pportdata(struct qib_pportdata *ppd, struct qib_devdata *dd,
                        u8 hw_pidx, u8 port)
{
        ppd->dd = dd;
        ppd->hw_pidx = hw_pidx;
        ppd->port = port; /* IB port number, not index */

        spin_lock_init(&ppd->sdma_lock);
        spin_lock_init(&ppd->lflags_lock);
        init_waitqueue_head(&ppd->state_wait);

        init_timer(&ppd->symerr_clear_timer);
        ppd->symerr_clear_timer.function = qib_clear_symerror_on_linkup;
        ppd->symerr_clear_timer.data = (unsigned long)ppd;
}

static int init_pioavailregs(struct qib_devdata *dd)
{
        int ret, pidx;
        u64 *status_page;

        dd->pioavailregs_dma = dma_alloc_coherent(
                &dd->pcidev->dev, PAGE_SIZE, &dd->pioavailregs_phys,
                GFP_KERNEL);
        if (!dd->pioavailregs_dma) {
                qib_dev_err(dd, "failed to allocate PIOavail reg area "
                            "in memory\n");
                ret = -ENOMEM;
                goto done;
        }

        /*
         * We really want L2 cache aligned, but for current CPUs of
         * interest, they are the same.
         */
        status_page = (u64 *)
                ((char *) dd->pioavailregs_dma +
                 ((2 * L1_CACHE_BYTES +
                   dd->pioavregs * sizeof(u64)) & ~L1_CACHE_BYTES));
        /* device status comes first, for backwards compatibility */
        dd->devstatusp = status_page;
        *status_page++ = 0;
        for (pidx = 0; pidx < dd->num_pports; ++pidx) {
                dd->pport[pidx].statusp = status_page;
                *status_page++ = 0;
        }

        /*
         * Setup buffer to hold freeze and other messages, accessible to
         * apps, following statusp.  This is per-unit, not per port.
         */
        dd->freezemsg = (char *) status_page;
        *dd->freezemsg = 0;
        /* length of msg buffer is "whatever is left" */
        ret = (char *) status_page - (char *) dd->pioavailregs_dma;
        dd->freezelen = PAGE_SIZE - ret;

        ret = 0;

done:
        return ret;
}

/**
 * init_shadow_tids - allocate the shadow TID array
 * @dd: the qlogic_ib device
 *
 * allocate the shadow TID array, so we can qib_munlock previous
 * entries.  It may make more sense to move the pageshadow to the
 * ctxt data structure, so we only allocate memory for ctxts actually
 * in use, since we at 8k per ctxt, now.
 * We don't want failures here to prevent use of the driver/chip,
 * so no return value.
 */
static void init_shadow_tids(struct qib_devdata *dd)
{
        struct page **pages;
        dma_addr_t *addrs;

        pages = vzalloc(dd->cfgctxts * dd->rcvtidcnt * sizeof(struct page *));
        if (!pages) {
                qib_dev_err(dd, "failed to allocate shadow page * "
                            "array, no expected sends!\n");
                goto bail;
        }

        addrs = vzalloc(dd->cfgctxts * dd->rcvtidcnt * sizeof(dma_addr_t));
        if (!addrs) {
                qib_dev_err(dd, "failed to allocate shadow dma handle "
                            "array, no expected sends!\n");
                goto bail_free;
        }

        dd->pageshadow = pages;
        dd->physshadow = addrs;
        return;

bail_free:
        vfree(pages);
bail:
        dd->pageshadow = NULL;
}

/*
 * Do initialization for device that is only needed on
 * first detect, not on resets.
 */
static int loadtime_init(struct qib_devdata *dd)
{
        int ret = 0;

        if (((dd->revision >> QLOGIC_IB_R_SOFTWARE_SHIFT) &
             QLOGIC_IB_R_SOFTWARE_MASK) != QIB_CHIP_SWVERSION) {
                qib_dev_err(dd, "Driver only handles version %d, "
                            "chip swversion is %d (%llx), failng\n",
                            QIB_CHIP_SWVERSION,
                            (int)(dd->revision >>
                                QLOGIC_IB_R_SOFTWARE_SHIFT) &
                            QLOGIC_IB_R_SOFTWARE_MASK,
                            (unsigned long long) dd->revision);
                ret = -ENOSYS;
                goto done;
        }

        if (dd->revision & QLOGIC_IB_R_EMULATOR_MASK)
                qib_devinfo(dd->pcidev, "%s", dd->boardversion);

        spin_lock_init(&dd->pioavail_lock);
        spin_lock_init(&dd->sendctrl_lock);
        spin_lock_init(&dd->uctxt_lock);
        spin_lock_init(&dd->qib_diag_trans_lock);
        spin_lock_init(&dd->eep_st_lock);
        mutex_init(&dd->eep_lock);

        if (qib_mini_init)
                goto done;

        ret = init_pioavailregs(dd);
        init_shadow_tids(dd);

        qib_get_eeprom_info(dd);

        /* setup time (don't start yet) to verify we got interrupt */
        init_timer(&dd->intrchk_timer);
        dd->intrchk_timer.function = verify_interrupt;
        dd->intrchk_timer.data = (unsigned long) dd;

done:
        return ret;
}

/**
 * init_after_reset - re-initialize after a reset
 * @dd: the qlogic_ib device
 *
 * sanity check at least some of the values after reset, and
 * ensure no receive or transmit (explictly, in case reset
 * failed
 */
static int init_after_reset(struct qib_devdata *dd)
{
        int i;

        /*
         * Ensure chip does no sends or receives, tail updates, or
         * pioavail updates while we re-initialize.  This is mostly
         * for the driver data structures, not chip registers.
         */
        for (i = 0; i < dd->num_pports; ++i) {
                /*
                 * ctxt == -1 means "all contexts". Only really safe for
                 * _dis_abling things, as here.
                 */
                dd->f_rcvctrl(dd->pport + i, QIB_RCVCTRL_CTXT_DIS |
                                  QIB_RCVCTRL_INTRAVAIL_DIS |
                                  QIB_RCVCTRL_TAILUPD_DIS, -1);
                /* Redundant across ports for some, but no big deal.  */
                dd->f_sendctrl(dd->pport + i, QIB_SENDCTRL_SEND_DIS |
                        QIB_SENDCTRL_AVAIL_DIS);
        }

        return 0;
}

static void enable_chip(struct qib_devdata *dd)
{
        u64 rcvmask;
        int i;

        /*
         * Enable PIO send, and update of PIOavail regs to memory.
         */
        for (i = 0; i < dd->num_pports; ++i)
                dd->f_sendctrl(dd->pport + i, QIB_SENDCTRL_SEND_ENB |
                        QIB_SENDCTRL_AVAIL_ENB);
        /*
         * Enable kernel ctxts' receive and receive interrupt.
         * Other ctxts done as user opens and inits them.
         */
        rcvmask = QIB_RCVCTRL_CTXT_ENB | QIB_RCVCTRL_INTRAVAIL_ENB;
        rcvmask |= (dd->flags & QIB_NODMA_RTAIL) ?
                  QIB_RCVCTRL_TAILUPD_DIS : QIB_RCVCTRL_TAILUPD_ENB;
        for (i = 0; dd->rcd && i < dd->first_user_ctxt; ++i) {
                struct qib_ctxtdata *rcd = dd->rcd[i];

                if (rcd)
                        dd->f_rcvctrl(rcd->ppd, rcvmask, i);
        }
}

static void verify_interrupt(unsigned long opaque)
{
        struct qib_devdata *dd = (struct qib_devdata *) opaque;

        if (!dd)
                return; /* being torn down */

        /*
         * If we don't have a lid or any interrupts, let the user know and
         * don't bother checking again.
         */
        if (dd->int_counter == 0) {
                if (!dd->f_intr_fallback(dd))
                        dev_err(&dd->pcidev->dev, "No interrupts detected, "
                                "not usable.\n");
                else /* re-arm the timer to see if fallback works */
                        mod_timer(&dd->intrchk_timer, jiffies + HZ/2);
        }
}

static void init_piobuf_state(struct qib_devdata *dd)
{
        int i, pidx;
        u32 uctxts;

        /*
         * Ensure all buffers are free, and fifos empty.  Buffers
         * are common, so only do once for port 0.
         *
         * After enable and qib_chg_pioavailkernel so we can safely
         * enable pioavail updates and PIOENABLE.  After this, packets
         * are ready and able to go out.
         */
        dd->f_sendctrl(dd->pport, QIB_SENDCTRL_DISARM_ALL);
        for (pidx = 0; pidx < dd->num_pports; ++pidx)
                dd->f_sendctrl(dd->pport + pidx, QIB_SENDCTRL_FLUSH);

        /*
         * If not all sendbufs are used, add the one to each of the lower
         * numbered contexts.  pbufsctxt and lastctxt_piobuf are
         * calculated in chip-specific code because it may cause some
         * chip-specific adjustments to be made.
         */
        uctxts = dd->cfgctxts - dd->first_user_ctxt;
        dd->ctxts_extrabuf = dd->pbufsctxt ?
                dd->lastctxt_piobuf - (dd->pbufsctxt * uctxts) : 0;

        /*
         * Set up the shadow copies of the piobufavail registers,
         * which we compare against the chip registers for now, and
         * the in memory DMA'ed copies of the registers.
         * By now pioavail updates to memory should have occurred, so
         * copy them into our working/shadow registers; this is in
         * case something went wrong with abort, but mostly to get the
         * initial values of the generation bit correct.
         */
        for (i = 0; i < dd->pioavregs; i++) {
                __le64 tmp;

                tmp = dd->pioavailregs_dma[i];
                /*
                 * Don't need to worry about pioavailkernel here
                 * because we will call qib_chg_pioavailkernel() later
                 * in initialization, to busy out buffers as needed.
                 */
                dd->pioavailshadow[i] = le64_to_cpu(tmp);
        }
        while (i < ARRAY_SIZE(dd->pioavailshadow))
                dd->pioavailshadow[i++] = 0; /* for debugging sanity */

        /* after pioavailshadow is setup */
        qib_chg_pioavailkernel(dd, 0, dd->piobcnt2k + dd->piobcnt4k,
                               TXCHK_CHG_TYPE_KERN, NULL);
        dd->f_initvl15_bufs(dd);
}

/**
 * qib_init - do the actual initialization sequence on the chip
 * @dd: the qlogic_ib device
 * @reinit: reinitializing, so don't allocate new memory
 *
 * Do the actual initialization sequence on the chip.  This is done
 * both from the init routine called from the PCI infrastructure, and
 * when we reset the chip, or detect that it was reset internally,
 * or it's administratively re-enabled.
 *
 * Memory allocation here and in called routines is only done in
 * the first case (reinit == 0).  We have to be careful, because even
 * without memory allocation, we need to re-write all the chip registers
 * TIDs, etc. after the reset or enable has completed.
 */
int qib_init(struct qib_devdata *dd, int reinit)
{
        int ret = 0, pidx, lastfail = 0;
        u32 portok = 0;
        unsigned i;
        struct qib_ctxtdata *rcd;
        struct qib_pportdata *ppd;
        unsigned long flags;

        /* Set linkstate to unknown, so we can watch for a transition. */
        for (pidx = 0; pidx < dd->num_pports; ++pidx) {
                ppd = dd->pport + pidx;
                spin_lock_irqsave(&ppd->lflags_lock, flags);
                ppd->lflags &= ~(QIBL_LINKACTIVE | QIBL_LINKARMED |
                                 QIBL_LINKDOWN | QIBL_LINKINIT |
                                 QIBL_LINKV);
                spin_unlock_irqrestore(&ppd->lflags_lock, flags);
        }

        if (reinit)
                ret = init_after_reset(dd);
        else
                ret = loadtime_init(dd);
        if (ret)
                goto done;

        /* Bypass most chip-init, to get to device creation */
        if (qib_mini_init)
                return 0;

        ret = dd->f_late_initreg(dd);
        if (ret)
                goto done;

        /* dd->rcd can be NULL if early init failed */
        for (i = 0; dd->rcd && i < dd->first_user_ctxt; ++i) {
                /*
                 * Set up the (kernel) rcvhdr queue and egr TIDs.  If doing
                 * re-init, the simplest way to handle this is to free
                 * existing, and re-allocate.
                 * Need to re-create rest of ctxt 0 ctxtdata as well.
                 */
                rcd = dd->rcd[i];
                if (!rcd)
                        continue;

                lastfail = qib_create_rcvhdrq(dd, rcd);
                if (!lastfail)
                        lastfail = qib_setup_eagerbufs(rcd);
                if (lastfail) {
                        qib_dev_err(dd, "failed to allocate kernel ctxt's "
                                    "rcvhdrq and/or egr bufs\n");
                        continue;
                }
        }

        for (pidx = 0; pidx < dd->num_pports; ++pidx) {
                int mtu;
                if (lastfail)
                        ret = lastfail;
                ppd = dd->pport + pidx;
                mtu = ib_mtu_enum_to_int(qib_ibmtu);
                if (mtu == -1) {
                        mtu = QIB_DEFAULT_MTU;
                        qib_ibmtu = 0; /* don't leave invalid value */
                }
                /* set max we can ever have for this driver load */
                ppd->init_ibmaxlen = min(mtu > 2048 ?
                                         dd->piosize4k : dd->piosize2k,
                                         dd->rcvegrbufsize +
                                         (dd->rcvhdrentsize << 2));
                /*
                 * Have to initialize ibmaxlen, but this will normally
                 * change immediately in qib_set_mtu().
                 */
                ppd->ibmaxlen = ppd->init_ibmaxlen;
                qib_set_mtu(ppd, mtu);

                spin_lock_irqsave(&ppd->lflags_lock, flags);
                ppd->lflags |= QIBL_IB_LINK_DISABLED;
                spin_unlock_irqrestore(&ppd->lflags_lock, flags);

                lastfail = dd->f_bringup_serdes(ppd);
                if (lastfail) {
                        qib_devinfo(dd->pcidev,
                                 "Failed to bringup IB port %u\n", ppd->port);
                        lastfail = -ENETDOWN;
                        continue;
                }

                /* let link come up, and enable IBC */
                spin_lock_irqsave(&ppd->lflags_lock, flags);
                ppd->lflags &= ~QIBL_IB_LINK_DISABLED;
                spin_unlock_irqrestore(&ppd->lflags_lock, flags);
                portok++;
        }

        if (!portok) {
                /* none of the ports initialized */
                if (!ret && lastfail)
                        ret = lastfail;
                else if (!ret)
                        ret = -ENETDOWN;
                /* but continue on, so we can debug cause */
        }

        enable_chip(dd);

        init_piobuf_state(dd);

done:
        if (!ret) {
                /* chip is OK for user apps; mark it as initialized */
                for (pidx = 0; pidx < dd->num_pports; ++pidx) {
                        ppd = dd->pport + pidx;
                        /*
                         * Set status even if port serdes is not initialized
                         * so that diags will work.
                         */
                        *ppd->statusp |= QIB_STATUS_CHIP_PRESENT |
                                QIB_STATUS_INITTED;
                        if (!ppd->link_speed_enabled)
                                continue;
                        if (dd->flags & QIB_HAS_SEND_DMA)
                                ret = qib_setup_sdma(ppd);
                        init_timer(&ppd->hol_timer);
                        ppd->hol_timer.function = qib_hol_event;
                        ppd->hol_timer.data = (unsigned long)ppd;
                        ppd->hol_state = QIB_HOL_UP;
                }

                /* now we can enable all interrupts from the chip */
                dd->f_set_intr_state(dd, 1);

                /*
                 * Setup to verify we get an interrupt, and fallback
                 * to an alternate if necessary and possible.
                 */
                mod_timer(&dd->intrchk_timer, jiffies + HZ/2);
                /* start stats retrieval timer */
                mod_timer(&dd->stats_timer, jiffies + HZ * ACTIVITY_TIMER);
        }

        /* if ret is non-zero, we probably should do some cleanup here... */
        return ret;
}

/*
 * These next two routines are placeholders in case we don't have per-arch
 * code for controlling write combining.  If explicit control of write
 * combining is not available, performance will probably be awful.
 */

int __attribute__((weak)) qib_enable_wc(struct qib_devdata *dd)
{
        return -EOPNOTSUPP;
}

void __attribute__((weak)) qib_disable_wc(struct qib_devdata *dd)
{
}

static inline struct qib_devdata *__qib_lookup(int unit)
{
        return idr_find(&qib_unit_table, unit);
}

struct qib_devdata *qib_lookup(int unit)
{
        struct qib_devdata *dd;
        unsigned long flags;

        spin_lock_irqsave(&qib_devs_lock, flags);
        dd = __qib_lookup(unit);
        spin_unlock_irqrestore(&qib_devs_lock, flags);

        return dd;
}

/*
 * Stop the timers during unit shutdown, or after an error late
 * in initialization.
 */
static void qib_stop_timers(struct qib_devdata *dd)
{
        struct qib_pportdata *ppd;
        int pidx;

        if (dd->stats_timer.data) {
                del_timer_sync(&dd->stats_timer);
                dd->stats_timer.data = 0;
        }
        if (dd->intrchk_timer.data) {
                del_timer_sync(&dd->intrchk_timer);
                dd->intrchk_timer.data = 0;
        }
        for (pidx = 0; pidx < dd->num_pports; ++pidx) {
                ppd = dd->pport + pidx;
                if (ppd->hol_timer.data)
                        del_timer_sync(&ppd->hol_timer);
                if (ppd->led_override_timer.data) {
                        del_timer_sync(&ppd->led_override_timer);
                        atomic_set(&ppd->led_override_timer_active, 0);
                }
                if (ppd->symerr_clear_timer.data)
                        del_timer_sync(&ppd->symerr_clear_timer);
        }
}

/**
 * qib_shutdown_device - shut down a device
 * @dd: the qlogic_ib device
 *
 * This is called to make the device quiet when we are about to
 * unload the driver, and also when the device is administratively
 * disabled.   It does not free any data structures.
 * Everything it does has to be setup again by qib_init(dd, 1)
 */
static void qib_shutdown_device(struct qib_devdata *dd)
{
        struct qib_pportdata *ppd;
        unsigned pidx;

        for (pidx = 0; pidx < dd->num_pports; ++pidx) {
                ppd = dd->pport + pidx;

                spin_lock_irq(&ppd->lflags_lock);
                ppd->lflags &= ~(QIBL_LINKDOWN | QIBL_LINKINIT |
                                 QIBL_LINKARMED | QIBL_LINKACTIVE |
                                 QIBL_LINKV);
                spin_unlock_irq(&ppd->lflags_lock);
                *ppd->statusp &= ~(QIB_STATUS_IB_CONF | QIB_STATUS_IB_READY);
        }
        dd->flags &= ~QIB_INITTED;

        /* mask interrupts, but not errors */
        dd->f_set_intr_state(dd, 0);

        for (pidx = 0; pidx < dd->num_pports; ++pidx) {
                ppd = dd->pport + pidx;
                dd->f_rcvctrl(ppd, QIB_RCVCTRL_TAILUPD_DIS |
                                   QIB_RCVCTRL_CTXT_DIS |
                                   QIB_RCVCTRL_INTRAVAIL_DIS |
                                   QIB_RCVCTRL_PKEY_ENB, -1);
                /*
                 * Gracefully stop all sends allowing any in progress to
                 * trickle out first.
                 */
                dd->f_sendctrl(ppd, QIB_SENDCTRL_CLEAR);
        }

        /*
         * Enough for anything that's going to trickle out to have actually
         * done so.
         */
        udelay(20);

        for (pidx = 0; pidx < dd->num_pports; ++pidx) {
                ppd = dd->pport + pidx;
                dd->f_setextled(ppd, 0); /* make sure LEDs are off */

                if (dd->flags & QIB_HAS_SEND_DMA)
                        qib_teardown_sdma(ppd);

                dd->f_sendctrl(ppd, QIB_SENDCTRL_AVAIL_DIS |
                                    QIB_SENDCTRL_SEND_DIS);
                /*
                 * Clear SerdesEnable.
                 * We can't count on interrupts since we are stopping.
                 */
                dd->f_quiet_serdes(ppd);
        }

        qib_update_eeprom_log(dd);
}

/**
 * qib_free_ctxtdata - free a context's allocated data
 * @dd: the qlogic_ib device
 * @rcd: the ctxtdata structure
 *
 * free up any allocated data for a context
 * This should not touch anything that would affect a simultaneous
 * re-allocation of context data, because it is called after qib_mutex
 * is released (and can be called from reinit as well).
 * It should never change any chip state, or global driver state.
 */
void qib_free_ctxtdata(struct qib_devdata *dd, struct qib_ctxtdata *rcd)
{
        if (!rcd)
                return;

        if (rcd->rcvhdrq) {
                dma_free_coherent(&dd->pcidev->dev, rcd->rcvhdrq_size,
                                  rcd->rcvhdrq, rcd->rcvhdrq_phys);
                rcd->rcvhdrq = NULL;
                if (rcd->rcvhdrtail_kvaddr) {
                        dma_free_coherent(&dd->pcidev->dev, PAGE_SIZE,
                                          rcd->rcvhdrtail_kvaddr,
                                          rcd->rcvhdrqtailaddr_phys);
                        rcd->rcvhdrtail_kvaddr = NULL;
                }
        }
        if (rcd->rcvegrbuf) {
                unsigned e;

                for (e = 0; e < rcd->rcvegrbuf_chunks; e++) {
                        void *base = rcd->rcvegrbuf[e];
                        size_t size = rcd->rcvegrbuf_size;

                        dma_free_coherent(&dd->pcidev->dev, size,
                                          base, rcd->rcvegrbuf_phys[e]);
                }
                kfree(rcd->rcvegrbuf);
                rcd->rcvegrbuf = NULL;
                kfree(rcd->rcvegrbuf_phys);
                rcd->rcvegrbuf_phys = NULL;
                rcd->rcvegrbuf_chunks = 0;
        }

        kfree(rcd->tid_pg_list);
        vfree(rcd->user_event_mask);
        vfree(rcd->subctxt_uregbase);
        vfree(rcd->subctxt_rcvegrbuf);
        vfree(rcd->subctxt_rcvhdr_base);
        kfree(rcd);
}

/*
 * Perform a PIO buffer bandwidth write test, to verify proper system
 * configuration.  Even when all the setup calls work, occasionally
 * BIOS or other issues can prevent write combining from working, or
 * can cause other bandwidth problems to the chip.
 *
 * This test simply writes the same buffer over and over again, and
 * measures close to the peak bandwidth to the chip (not testing
 * data bandwidth to the wire).   On chips that use an address-based
 * trigger to send packets to the wire, this is easy.  On chips that
 * use a count to trigger, we want to make sure that the packet doesn't
 * go out on the wire, or trigger flow control checks.
 */
static void qib_verify_pioperf(struct qib_devdata *dd)
{
        u32 pbnum, cnt, lcnt;
        u32 __iomem *piobuf;
        u32 *addr;
        u64 msecs, emsecs;

        piobuf = dd->f_getsendbuf(dd->pport, 0ULL, &pbnum);
        if (!piobuf) {
                qib_devinfo(dd->pcidev,
                         "No PIObufs for checking perf, skipping\n");
                return;
        }

        /*
         * Enough to give us a reasonable test, less than piobuf size, and
         * likely multiple of store buffer length.
         */
        cnt = 1024;

        addr = vmalloc(cnt);
        if (!addr) {
                qib_devinfo(dd->pcidev,
                         "Couldn't get memory for checking PIO perf,"
                         " skipping\n");
                goto done;
        }

        preempt_disable();  /* we want reasonably accurate elapsed time */
        msecs = 1 + jiffies_to_msecs(jiffies);
        for (lcnt = 0; lcnt < 10000U; lcnt++) {
                /* wait until we cross msec boundary */
                if (jiffies_to_msecs(jiffies) >= msecs)
                        break;
                udelay(1);
        }

        dd->f_set_armlaunch(dd, 0);

        /*
         * length 0, no dwords actually sent
         */
        writeq(0, piobuf);
        qib_flush_wc();

        /*
         * This is only roughly accurate, since even with preempt we
         * still take interrupts that could take a while.   Running for
         * >= 5 msec seems to get us "close enough" to accurate values.
         */
        msecs = jiffies_to_msecs(jiffies);
        for (emsecs = lcnt = 0; emsecs <= 5UL; lcnt++) {
                qib_pio_copy(piobuf + 64, addr, cnt >> 2);
                emsecs = jiffies_to_msecs(jiffies) - msecs;
        }

        /* 1 GiB/sec, slightly over IB SDR line rate */
        if (lcnt < (emsecs * 1024U))
                qib_dev_err(dd,
                            "Performance problem: bandwidth to PIO buffers is "
                            "only %u MiB/sec\n",
                            lcnt / (u32) emsecs);

        preempt_enable();

        vfree(addr);

done:
        /* disarm piobuf, so it's available again */
        dd->f_sendctrl(dd->pport, QIB_SENDCTRL_DISARM_BUF(pbnum));
        qib_sendbuf_done(dd, pbnum);
        dd->f_set_armlaunch(dd, 1);
}


void qib_free_devdata(struct qib_devdata *dd)
{
        unsigned long flags;

        spin_lock_irqsave(&qib_devs_lock, flags);
        idr_remove(&qib_unit_table, dd->unit);
        list_del(&dd->list);
        spin_unlock_irqrestore(&qib_devs_lock, flags);

        ib_dealloc_device(&dd->verbs_dev.ibdev);
}

/*
 * Allocate our primary per-unit data structure.  Must be done via verbs
 * allocator, because the verbs cleanup process both does cleanup and
 * free of the data structure.
 * "extra" is for chip-specific data.
 *
 * Use the idr mechanism to get a unit number for this unit.
 */
struct qib_devdata *qib_alloc_devdata(struct pci_dev *pdev, size_t extra)
{
        unsigned long flags;
        struct qib_devdata *dd;
        int ret;

        if (!idr_pre_get(&qib_unit_table, GFP_KERNEL)) {
                dd = ERR_PTR(-ENOMEM);
                goto bail;
        }

        dd = (struct qib_devdata *) ib_alloc_device(sizeof(*dd) + extra);
        if (!dd) {
                dd = ERR_PTR(-ENOMEM);
                goto bail;
        }

        spin_lock_irqsave(&qib_devs_lock, flags);
        ret = idr_get_new(&qib_unit_table, dd, &dd->unit);
        if (ret >= 0)
                list_add(&dd->list, &qib_dev_list);
        spin_unlock_irqrestore(&qib_devs_lock, flags);

        if (ret < 0) {
                qib_early_err(&pdev->dev,
                              "Could not allocate unit ID: error %d\n", -ret);
                ib_dealloc_device(&dd->verbs_dev.ibdev);
                dd = ERR_PTR(ret);
                goto bail;
        }

        if (!qib_cpulist_count) {
                u32 count = num_online_cpus();
                qib_cpulist = kzalloc(BITS_TO_LONGS(count) *
                                      sizeof(long), GFP_KERNEL);
                if (qib_cpulist)
                        qib_cpulist_count = count;
                else
                        qib_early_err(&pdev->dev, "Could not alloc cpulist "
                                      "info, cpu affinity might be wrong\n");
        }

bail:
        return dd;
}

/*
 * Called from freeze mode handlers, and from PCI error
 * reporting code.  Should be paranoid about state of
 * system and data structures.
 */
void qib_disable_after_error(struct qib_devdata *dd)
{
        if (dd->flags & QIB_INITTED) {
                u32 pidx;

                dd->flags &= ~QIB_INITTED;
                if (dd->pport)
                        for (pidx = 0; pidx < dd->num_pports; ++pidx) {
                                struct qib_pportdata *ppd;

                                ppd = dd->pport + pidx;
                                if (dd->flags & QIB_PRESENT) {
                                        qib_set_linkstate(ppd,
                                                QIB_IB_LINKDOWN_DISABLE);
                                        dd->f_setextled(ppd, 0);
                                }
                                *ppd->statusp &= ~QIB_STATUS_IB_READY;
                        }
        }

        /*
         * Mark as having had an error for driver, and also
         * for /sys and status word mapped to user programs.
         * This marks unit as not usable, until reset.
         */
        if (dd->devstatusp)
                *dd->devstatusp |= QIB_STATUS_HWERROR;
}

static void __devexit qib_remove_one(struct pci_dev *);
static int __devinit qib_init_one(struct pci_dev *,
                                  const struct pci_device_id *);

#define DRIVER_LOAD_MSG "QLogic " QIB_DRV_NAME " loaded: "
#define PFX QIB_DRV_NAME ": "

static const struct pci_device_id qib_pci_tbl[] = {
        { PCI_DEVICE(PCI_VENDOR_ID_PATHSCALE, PCI_DEVICE_ID_QLOGIC_IB_6120) },
        { PCI_DEVICE(PCI_VENDOR_ID_QLOGIC, PCI_DEVICE_ID_QLOGIC_IB_7220) },
        { PCI_DEVICE(PCI_VENDOR_ID_QLOGIC, PCI_DEVICE_ID_QLOGIC_IB_7322) },
        { 0, }
};

MODULE_DEVICE_TABLE(pci, qib_pci_tbl);

struct pci_driver qib_driver = {
        .name = QIB_DRV_NAME,
        .probe = qib_init_one,
        .remove = __devexit_p(qib_remove_one),
        .id_table = qib_pci_tbl,
        .err_handler = &qib_pci_err_handler,
};

/*
 * Do all the generic driver unit- and chip-independent memory
 * allocation and initialization.
 */
static int __init qlogic_ib_init(void)
{
        int ret;

        ret = qib_dev_init();
        if (ret)
                goto bail;

        /*
         * We create our own workqueue mainly because we want to be
         * able to flush it when devices are being removed.  We can't
         * use schedule_work()/flush_scheduled_work() because both
         * unregister_netdev() and linkwatch_event take the rtnl lock,
         * so flush_scheduled_work() can deadlock during device
         * removal.
         */
        qib_wq = create_workqueue("qib");
        if (!qib_wq) {
                ret = -ENOMEM;
                goto bail_dev;
        }

        qib_cq_wq = create_singlethread_workqueue("qib_cq");
        if (!qib_cq_wq) {
                ret = -ENOMEM;
                goto bail_wq;
        }

        /*
         * These must be called before the driver is registered with
         * the PCI subsystem.
         */
        idr_init(&qib_unit_table);
        if (!idr_pre_get(&qib_unit_table, GFP_KERNEL)) {
                printk(KERN_ERR QIB_DRV_NAME ": idr_pre_get() failed\n");
                ret = -ENOMEM;
                goto bail_cq_wq;
        }

        ret = pci_register_driver(&qib_driver);
        if (ret < 0) {
                printk(KERN_ERR QIB_DRV_NAME
                       ": Unable to register driver: error %d\n", -ret);
                goto bail_unit;
        }

        /* not fatal if it doesn't work */
        if (qib_init_qibfs())
                printk(KERN_ERR QIB_DRV_NAME ": Unable to register ipathfs\n");
        goto bail; /* all OK */

bail_unit:
        idr_destroy(&qib_unit_table);
bail_cq_wq:
        destroy_workqueue(qib_cq_wq);
bail_wq:
        destroy_workqueue(qib_wq);
bail_dev:
        qib_dev_cleanup();
bail:
        return ret;
}

module_init(qlogic_ib_init);

/*
 * Do the non-unit driver cleanup, memory free, etc. at unload.
 */
static void __exit qlogic_ib_cleanup(void)
{
        int ret;

        ret = qib_exit_qibfs();
        if (ret)
                printk(KERN_ERR QIB_DRV_NAME ": "
                        "Unable to cleanup counter filesystem: "
                        "error %d\n", -ret);

        pci_unregister_driver(&qib_driver);

        destroy_workqueue(qib_wq);
        destroy_workqueue(qib_cq_wq);

        qib_cpulist_count = 0;
        kfree(qib_cpulist);

        idr_destroy(&qib_unit_table);
        qib_dev_cleanup();
}

module_exit(qlogic_ib_cleanup);

/* this can only be called after a successful initialization */
static void cleanup_device_data(struct qib_devdata *dd)
{
        int ctxt;
        int pidx;
        struct qib_ctxtdata **tmp;
        unsigned long flags;

        /* users can't do anything more with chip */
        for (pidx = 0; pidx < dd->num_pports; ++pidx)
                if (dd->pport[pidx].statusp)
                        *dd->pport[pidx].statusp &= ~QIB_STATUS_CHIP_PRESENT;

        if (!qib_wc_pat)
                qib_disable_wc(dd);

        if (dd->pioavailregs_dma) {
                dma_free_coherent(&dd->pcidev->dev, PAGE_SIZE,
                                  (void *) dd->pioavailregs_dma,
                                  dd->pioavailregs_phys);
                dd->pioavailregs_dma = NULL;
        }

        if (dd->pageshadow) {
                struct page **tmpp = dd->pageshadow;
                dma_addr_t *tmpd = dd->physshadow;
                int i, cnt = 0;

                for (ctxt = 0; ctxt < dd->cfgctxts; ctxt++) {
                        int ctxt_tidbase = ctxt * dd->rcvtidcnt;
                        int maxtid = ctxt_tidbase + dd->rcvtidcnt;

                        for (i = ctxt_tidbase; i < maxtid; i++) {
                                if (!tmpp[i])
                                        continue;
                                pci_unmap_page(dd->pcidev, tmpd[i],
                                               PAGE_SIZE, PCI_DMA_FROMDEVICE);
                                qib_release_user_pages(&tmpp[i], 1);
                                tmpp[i] = NULL;
                                cnt++;
                        }
                }

                tmpp = dd->pageshadow;
                dd->pageshadow = NULL;
                vfree(tmpp);
        }

        /*
         * Free any resources still in use (usually just kernel contexts)
         * at unload; we do for ctxtcnt, because that's what we allocate.
         * We acquire lock to be really paranoid that rcd isn't being
         * accessed from some interrupt-related code (that should not happen,
         * but best to be sure).
         */
        spin_lock_irqsave(&dd->uctxt_lock, flags);
        tmp = dd->rcd;
        dd->rcd = NULL;
        spin_unlock_irqrestore(&dd->uctxt_lock, flags);
        for (ctxt = 0; tmp && ctxt < dd->ctxtcnt; ctxt++) {
                struct qib_ctxtdata *rcd = tmp[ctxt];

                tmp[ctxt] = NULL; /* debugging paranoia */
                qib_free_ctxtdata(dd, rcd);
        }
        kfree(tmp);
        kfree(dd->boardname);
}

/*
 * Clean up on unit shutdown, or error during unit load after
 * successful initialization.
 */
static void qib_postinit_cleanup(struct qib_devdata *dd)
{
        /*
         * Clean up chip-specific stuff.
         * We check for NULL here, because it's outside
         * the kregbase check, and we need to call it
         * after the free_irq.  Thus it's possible that
         * the function pointers were never initialized.
         */
        if (dd->f_cleanup)
                dd->f_cleanup(dd);

        qib_pcie_ddcleanup(dd);

        cleanup_device_data(dd);

        qib_free_devdata(dd);
}

static int __devinit qib_init_one(struct pci_dev *pdev,
                                  const struct pci_device_id *ent)
{
        int ret, j, pidx, initfail;
        struct qib_devdata *dd = NULL;

        ret = qib_pcie_init(pdev, ent);
        if (ret)
                goto bail;

        /*
         * Do device-specific initialiation, function table setup, dd
         * allocation, etc.
         */
        switch (ent->device) {
        case PCI_DEVICE_ID_QLOGIC_IB_6120:
#ifdef CONFIG_PCI_MSI
                dd = qib_init_iba6120_funcs(pdev, ent);
#else
                qib_early_err(&pdev->dev, "QLogic PCIE device 0x%x cannot "
                      "work if CONFIG_PCI_MSI is not enabled\n",
                      ent->device);
                dd = ERR_PTR(-ENODEV);
#endif
                break;

        case PCI_DEVICE_ID_QLOGIC_IB_7220:
                dd = qib_init_iba7220_funcs(pdev, ent);
                break;

        case PCI_DEVICE_ID_QLOGIC_IB_7322:
                dd = qib_init_iba7322_funcs(pdev, ent);
                break;

        default:
                qib_early_err(&pdev->dev, "Failing on unknown QLogic "
                              "deviceid 0x%x\n", ent->device);
                ret = -ENODEV;
        }

        if (IS_ERR(dd))
                ret = PTR_ERR(dd);
        if (ret)
                goto bail; /* error already printed */

        /* do the generic initialization */
        initfail = qib_init(dd, 0);

        ret = qib_register_ib_device(dd);

        /*
         * Now ready for use.  this should be cleared whenever we
         * detect a reset, or initiate one.  If earlier failure,
         * we still create devices, so diags, etc. can be used
         * to determine cause of problem.
         */
        if (!qib_mini_init && !initfail && !ret)
                dd->flags |= QIB_INITTED;

        j = qib_device_create(dd);
        if (j)
                qib_dev_err(dd, "Failed to create /dev devices: %d\n", -j);
        j = qibfs_add(dd);
        if (j)
                qib_dev_err(dd, "Failed filesystem setup for counters: %d\n",
                            -j);

        if (qib_mini_init || initfail || ret) {
                qib_stop_timers(dd);
                flush_scheduled_work();
                for (pidx = 0; pidx < dd->num_pports; ++pidx)
                        dd->f_quiet_serdes(dd->pport + pidx);
                if (qib_mini_init)
                        goto bail;
                if (!j) {
                        (void) qibfs_remove(dd);
                        qib_device_remove(dd);
                }
                if (!ret)
                        qib_unregister_ib_device(dd);
                qib_postinit_cleanup(dd);
                if (initfail)
                        ret = initfail;
                goto bail;
        }

        if (!qib_wc_pat) {
                ret = qib_enable_wc(dd);
                if (ret) {
                        qib_dev_err(dd, "Write combining not enabled "
                                    "(err %d): performance may be poor\n",
                                    -ret);
                        ret = 0;
                }
        }

        qib_verify_pioperf(dd);
bail:
        return ret;
}

static void __devexit qib_remove_one(struct pci_dev *pdev)
{
        struct qib_devdata *dd = pci_get_drvdata(pdev);
        int ret;

        /* unregister from IB core */
        qib_unregister_ib_device(dd);

        /*
         * Disable the IB link, disable interrupts on the device,
         * clear dma engines, etc.
         */
        if (!qib_mini_init)
                qib_shutdown_device(dd);

        qib_stop_timers(dd);

        /* wait until all of our (qsfp) schedule_work() calls complete */
        flush_scheduled_work();

        ret = qibfs_remove(dd);
        if (ret)
                qib_dev_err(dd, "Failed counters filesystem cleanup: %d\n",
                            -ret);

        qib_device_remove(dd);

        qib_postinit_cleanup(dd);
}

/**
 * qib_create_rcvhdrq - create a receive header queue
 * @dd: the qlogic_ib device
 * @rcd: the context data
 *
 * This must be contiguous memory (from an i/o perspective), and must be
 * DMA'able (which means for some systems, it will go through an IOMMU,
 * or be forced into a low address range).
 */
int qib_create_rcvhdrq(struct qib_devdata *dd, struct qib_ctxtdata *rcd)
{
        unsigned amt;

        if (!rcd->rcvhdrq) {
                dma_addr_t phys_hdrqtail;
                gfp_t gfp_flags;

                amt = ALIGN(dd->rcvhdrcnt * dd->rcvhdrentsize *
                            sizeof(u32), PAGE_SIZE);
                gfp_flags = (rcd->ctxt >= dd->first_user_ctxt) ?
                        GFP_USER : GFP_KERNEL;
                rcd->rcvhdrq = dma_alloc_coherent(
                        &dd->pcidev->dev, amt, &rcd->rcvhdrq_phys,
                        gfp_flags | __GFP_COMP);

                if (!rcd->rcvhdrq) {
                        qib_dev_err(dd, "attempt to allocate %d bytes "
                                    "for ctxt %u rcvhdrq failed\n",
                                    amt, rcd->ctxt);
                        goto bail;
                }

                if (rcd->ctxt >= dd->first_user_ctxt) {
                        rcd->user_event_mask = vmalloc_user(PAGE_SIZE);
                        if (!rcd->user_event_mask)
                                goto bail_free_hdrq;
                }

                if (!(dd->flags & QIB_NODMA_RTAIL)) {
                        rcd->rcvhdrtail_kvaddr = dma_alloc_coherent(
                                &dd->pcidev->dev, PAGE_SIZE, &phys_hdrqtail,
                                gfp_flags);
                        if (!rcd->rcvhdrtail_kvaddr)
                                goto bail_free;
                        rcd->rcvhdrqtailaddr_phys = phys_hdrqtail;
                }

                rcd->rcvhdrq_size = amt;
        }

        /* clear for security and sanity on each use */
        memset(rcd->rcvhdrq, 0, rcd->rcvhdrq_size);
        if (rcd->rcvhdrtail_kvaddr)
                memset(rcd->rcvhdrtail_kvaddr, 0, PAGE_SIZE);
        return 0;

bail_free:
        qib_dev_err(dd, "attempt to allocate 1 page for ctxt %u "
                    "rcvhdrqtailaddr failed\n", rcd->ctxt);
        vfree(rcd->user_event_mask);
        rcd->user_event_mask = NULL;
bail_free_hdrq:
        dma_free_coherent(&dd->pcidev->dev, amt, rcd->rcvhdrq,
                          rcd->rcvhdrq_phys);
        rcd->rcvhdrq = NULL;
bail:
        return -ENOMEM;
}

/**
 * allocate eager buffers, both kernel and user contexts.
 * @rcd: the context we are setting up.
 *
 * Allocate the eager TID buffers and program them into hip.
 * They are no longer completely contiguous, we do multiple allocation
 * calls.  Otherwise we get the OOM code involved, by asking for too
 * much per call, with disastrous results on some kernels.
 */
int qib_setup_eagerbufs(struct qib_ctxtdata *rcd)
{
        struct qib_devdata *dd = rcd->dd;
        unsigned e, egrcnt, egrperchunk, chunk, egrsize, egroff;
        size_t size;
        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 = rcd->rcvegrcnt;
        egroff = rcd->rcvegr_tid_base;
        egrsize = dd->rcvegrbufsize;

        chunk = rcd->rcvegrbuf_chunks;
        egrperchunk = rcd->rcvegrbufs_perchunk;
        size = rcd->rcvegrbuf_size;
        if (!rcd->rcvegrbuf) {
                rcd->rcvegrbuf =
                        kzalloc(chunk * sizeof(rcd->rcvegrbuf[0]),
                                GFP_KERNEL);
                if (!rcd->rcvegrbuf)
                        goto bail;
        }
        if (!rcd->rcvegrbuf_phys) {
                rcd->rcvegrbuf_phys =
                        kmalloc(chunk * sizeof(rcd->rcvegrbuf_phys[0]),
                                GFP_KERNEL);
                if (!rcd->rcvegrbuf_phys)
                        goto bail_rcvegrbuf;
        }
        for (e = 0; e < rcd->rcvegrbuf_chunks; e++) {
                if (rcd->rcvegrbuf[e])
                        continue;
                rcd->rcvegrbuf[e] =
                        dma_alloc_coherent(&dd->pcidev->dev, size,
                                           &rcd->rcvegrbuf_phys[e],
                                           gfp_flags);
                if (!rcd->rcvegrbuf[e])
                        goto bail_rcvegrbuf_phys;
        }

        rcd->rcvegr_phys = rcd->rcvegrbuf_phys[0];

        for (e = chunk = 0; chunk < rcd->rcvegrbuf_chunks; chunk++) {
                dma_addr_t pa = rcd->rcvegrbuf_phys[chunk];
                unsigned i;

                /* clear for security and sanity on each use */
                memset(rcd->rcvegrbuf[chunk], 0, size);

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

        return 0;

bail_rcvegrbuf_phys:
        for (e = 0; e < rcd->rcvegrbuf_chunks && rcd->rcvegrbuf[e]; e++)
                dma_free_coherent(&dd->pcidev->dev, size,
                                  rcd->rcvegrbuf[e], rcd->rcvegrbuf_phys[e]);
        kfree(rcd->rcvegrbuf_phys);
        rcd->rcvegrbuf_phys = NULL;
bail_rcvegrbuf:
        kfree(rcd->rcvegrbuf);
        rcd->rcvegrbuf = NULL;
bail:
        return -ENOMEM;
}

/*
 * Note: Changes to this routine should be mirrored
 * for the diagnostics routine qib_remap_ioaddr32().
 * There is also related code for VL15 buffers in qib_init_7322_variables().
 * The teardown code that unmaps is in qib_pcie_ddcleanup()
 */
int init_chip_wc_pat(struct qib_devdata *dd, u32 vl15buflen)
{
        u64 __iomem *qib_kregbase = NULL;
        void __iomem *qib_piobase = NULL;
        u64 __iomem *qib_userbase = NULL;
        u64 qib_kreglen;
        u64 qib_pio2koffset = dd->piobufbase & 0xffffffff;
        u64 qib_pio4koffset = dd->piobufbase >> 32;
        u64 qib_pio2klen = dd->piobcnt2k * dd->palign;
        u64 qib_pio4klen = dd->piobcnt4k * dd->align4k;
        u64 qib_physaddr = dd->physaddr;
        u64 qib_piolen;
        u64 qib_userlen = 0;

        /*
         * Free the old mapping because the kernel will try to reuse the
         * old mapping and not create a new mapping with the
         * write combining attribute.
         */
        iounmap(dd->kregbase);
        dd->kregbase = NULL;

        /*
         * Assumes chip address space looks like:
         *      - kregs + sregs + cregs + uregs (in any order)
         *      - piobufs (2K and 4K bufs in either order)
         * or:
         *      - kregs + sregs + cregs (in any order)
         *      - piobufs (2K and 4K bufs in either order)
         *      - uregs
         */
        if (dd->piobcnt4k == 0) {
                qib_kreglen = qib_pio2koffset;
                qib_piolen = qib_pio2klen;
        } else if (qib_pio2koffset < qib_pio4koffset) {
                qib_kreglen = qib_pio2koffset;
                qib_piolen = qib_pio4koffset + qib_pio4klen - qib_kreglen;
        } else {
                qib_kreglen = qib_pio4koffset;
                qib_piolen = qib_pio2koffset + qib_pio2klen - qib_kreglen;
        }
        qib_piolen += vl15buflen;
        /* Map just the configured ports (not all hw ports) */
        if (dd->uregbase > qib_kreglen)
                qib_userlen = dd->ureg_align * dd->cfgctxts;

        /* Sanity checks passed, now create the new mappings */
        qib_kregbase = ioremap_nocache(qib_physaddr, qib_kreglen);
        if (!qib_kregbase)
                goto bail;

        qib_piobase = ioremap_wc(qib_physaddr + qib_kreglen, qib_piolen);
        if (!qib_piobase)
                goto bail_kregbase;

        if (qib_userlen) {
                qib_userbase = ioremap_nocache(qib_physaddr + dd->uregbase,
                                               qib_userlen);
                if (!qib_userbase)
                        goto bail_piobase;
        }

        dd->kregbase = qib_kregbase;
        dd->kregend = (u64 __iomem *)
                ((char __iomem *) qib_kregbase + qib_kreglen);
        dd->piobase = qib_piobase;
        dd->pio2kbase = (void __iomem *)
                (((char __iomem *) dd->piobase) +
                 qib_pio2koffset - qib_kreglen);
        if (dd->piobcnt4k)
                dd->pio4kbase = (void __iomem *)
                        (((char __iomem *) dd->piobase) +
                         qib_pio4koffset - qib_kreglen);
        if (qib_userlen)
                /* ureg will now be accessed relative to dd->userbase */
                dd->userbase = qib_userbase;
        return 0;

bail_piobase:
        iounmap(qib_piobase);
bail_kregbase:
        iounmap(qib_kregbase);
bail:
        return -ENOMEM;
}