timerfd: Allow timers to be cancelled when clock was set

[linux-2.6/linux-mips.git] / drivers / net / mlx4 / eq.c

/*
 * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2005, 2006, 2007 Cisco Systems, 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/interrupt.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>

#include <linux/mlx4/cmd.h>

#include "mlx4.h"
#include "fw.h"

enum {
        MLX4_IRQNAME_SIZE       = 32
};

enum {
        MLX4_NUM_ASYNC_EQE      = 0x100,
        MLX4_NUM_SPARE_EQE      = 0x80,
        MLX4_EQ_ENTRY_SIZE      = 0x20
};

/*
 * Must be packed because start is 64 bits but only aligned to 32 bits.
 */
struct mlx4_eq_context {
        __be32                  flags;
        u16                     reserved1[3];
        __be16                  page_offset;
        u8                      log_eq_size;
        u8                      reserved2[4];
        u8                      eq_period;
        u8                      reserved3;
        u8                      eq_max_count;
        u8                      reserved4[3];
        u8                      intr;
        u8                      log_page_size;
        u8                      reserved5[2];
        u8                      mtt_base_addr_h;
        __be32                  mtt_base_addr_l;
        u32                     reserved6[2];
        __be32                  consumer_index;
        __be32                  producer_index;
        u32                     reserved7[4];
};

#define MLX4_EQ_STATUS_OK          ( 0 << 28)
#define MLX4_EQ_STATUS_WRITE_FAIL  (10 << 28)
#define MLX4_EQ_OWNER_SW           ( 0 << 24)
#define MLX4_EQ_OWNER_HW           ( 1 << 24)
#define MLX4_EQ_FLAG_EC            ( 1 << 18)
#define MLX4_EQ_FLAG_OI            ( 1 << 17)
#define MLX4_EQ_STATE_ARMED        ( 9 <<  8)
#define MLX4_EQ_STATE_FIRED        (10 <<  8)
#define MLX4_EQ_STATE_ALWAYS_ARMED (11 <<  8)

#define MLX4_ASYNC_EVENT_MASK ((1ull << MLX4_EVENT_TYPE_PATH_MIG)           | \
                               (1ull << MLX4_EVENT_TYPE_COMM_EST)           | \
                               (1ull << MLX4_EVENT_TYPE_SQ_DRAINED)         | \
                               (1ull << MLX4_EVENT_TYPE_CQ_ERROR)           | \
                               (1ull << MLX4_EVENT_TYPE_WQ_CATAS_ERROR)     | \
                               (1ull << MLX4_EVENT_TYPE_EEC_CATAS_ERROR)    | \
                               (1ull << MLX4_EVENT_TYPE_PATH_MIG_FAILED)    | \
                               (1ull << MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR) | \
                               (1ull << MLX4_EVENT_TYPE_WQ_ACCESS_ERROR)    | \
                               (1ull << MLX4_EVENT_TYPE_PORT_CHANGE)        | \
                               (1ull << MLX4_EVENT_TYPE_ECC_DETECT)         | \
                               (1ull << MLX4_EVENT_TYPE_SRQ_CATAS_ERROR)    | \
                               (1ull << MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE)    | \
                               (1ull << MLX4_EVENT_TYPE_SRQ_LIMIT)          | \
                               (1ull << MLX4_EVENT_TYPE_CMD))

struct mlx4_eqe {
        u8                      reserved1;
        u8                      type;
        u8                      reserved2;
        u8                      subtype;
        union {
                u32             raw[6];
                struct {
                        __be32  cqn;
                } __packed comp;
                struct {
                        u16     reserved1;
                        __be16  token;
                        u32     reserved2;
                        u8      reserved3[3];
                        u8      status;
                        __be64  out_param;
                } __packed cmd;
                struct {
                        __be32  qpn;
                } __packed qp;
                struct {
                        __be32  srqn;
                } __packed srq;
                struct {
                        __be32  cqn;
                        u32     reserved1;
                        u8      reserved2[3];
                        u8      syndrome;
                } __packed cq_err;
                struct {
                        u32     reserved1[2];
                        __be32  port;
                } __packed port_change;
        }                       event;
        u8                      reserved3[3];
        u8                      owner;
} __packed;

static void eq_set_ci(struct mlx4_eq *eq, int req_not)
{
        __raw_writel((__force u32) cpu_to_be32((eq->cons_index & 0xffffff) |
                                               req_not << 31),
                     eq->doorbell);
        /* We still want ordering, just not swabbing, so add a barrier */
        mb();
}

static struct mlx4_eqe *get_eqe(struct mlx4_eq *eq, u32 entry)
{
        unsigned long off = (entry & (eq->nent - 1)) * MLX4_EQ_ENTRY_SIZE;
        return eq->page_list[off / PAGE_SIZE].buf + off % PAGE_SIZE;
}

static struct mlx4_eqe *next_eqe_sw(struct mlx4_eq *eq)
{
        struct mlx4_eqe *eqe = get_eqe(eq, eq->cons_index);
        return !!(eqe->owner & 0x80) ^ !!(eq->cons_index & eq->nent) ? NULL : eqe;
}

static int mlx4_eq_int(struct mlx4_dev *dev, struct mlx4_eq *eq)
{
        struct mlx4_eqe *eqe;
        int cqn;
        int eqes_found = 0;
        int set_ci = 0;
        int port;

        while ((eqe = next_eqe_sw(eq))) {
                /*
                 * Make sure we read EQ entry contents after we've
                 * checked the ownership bit.
                 */
                rmb();

                switch (eqe->type) {
                case MLX4_EVENT_TYPE_COMP:
                        cqn = be32_to_cpu(eqe->event.comp.cqn) & 0xffffff;
                        mlx4_cq_completion(dev, cqn);
                        break;

                case MLX4_EVENT_TYPE_PATH_MIG:
                case MLX4_EVENT_TYPE_COMM_EST:
                case MLX4_EVENT_TYPE_SQ_DRAINED:
                case MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE:
                case MLX4_EVENT_TYPE_WQ_CATAS_ERROR:
                case MLX4_EVENT_TYPE_PATH_MIG_FAILED:
                case MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
                case MLX4_EVENT_TYPE_WQ_ACCESS_ERROR:
                        mlx4_qp_event(dev, be32_to_cpu(eqe->event.qp.qpn) & 0xffffff,
                                      eqe->type);
                        break;

                case MLX4_EVENT_TYPE_SRQ_LIMIT:
                case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
                        mlx4_srq_event(dev, be32_to_cpu(eqe->event.srq.srqn) & 0xffffff,
                                      eqe->type);
                        break;

                case MLX4_EVENT_TYPE_CMD:
                        mlx4_cmd_event(dev,
                                       be16_to_cpu(eqe->event.cmd.token),
                                       eqe->event.cmd.status,
                                       be64_to_cpu(eqe->event.cmd.out_param));
                        break;

                case MLX4_EVENT_TYPE_PORT_CHANGE:
                        port = be32_to_cpu(eqe->event.port_change.port) >> 28;
                        if (eqe->subtype == MLX4_PORT_CHANGE_SUBTYPE_DOWN) {
                                mlx4_dispatch_event(dev, MLX4_DEV_EVENT_PORT_DOWN,
                                                    port);
                                mlx4_priv(dev)->sense.do_sense_port[port] = 1;
                        } else {
                                mlx4_dispatch_event(dev, MLX4_DEV_EVENT_PORT_UP,
                                                    port);
                                mlx4_priv(dev)->sense.do_sense_port[port] = 0;
                        }
                        break;

                case MLX4_EVENT_TYPE_CQ_ERROR:
                        mlx4_warn(dev, "CQ %s on CQN %06x\n",
                                  eqe->event.cq_err.syndrome == 1 ?
                                  "overrun" : "access violation",
                                  be32_to_cpu(eqe->event.cq_err.cqn) & 0xffffff);
                        mlx4_cq_event(dev, be32_to_cpu(eqe->event.cq_err.cqn),
                                      eqe->type);
                        break;

                case MLX4_EVENT_TYPE_EQ_OVERFLOW:
                        mlx4_warn(dev, "EQ overrun on EQN %d\n", eq->eqn);
                        break;

                case MLX4_EVENT_TYPE_EEC_CATAS_ERROR:
                case MLX4_EVENT_TYPE_ECC_DETECT:
                default:
                        mlx4_warn(dev, "Unhandled event %02x(%02x) on EQ %d at index %u\n",
                                  eqe->type, eqe->subtype, eq->eqn, eq->cons_index);
                        break;
                }

                ++eq->cons_index;
                eqes_found = 1;
                ++set_ci;

                /*
                 * The HCA will think the queue has overflowed if we
                 * don't tell it we've been processing events.  We
                 * create our EQs with MLX4_NUM_SPARE_EQE extra
                 * entries, so we must update our consumer index at
                 * least that often.
                 */
                if (unlikely(set_ci >= MLX4_NUM_SPARE_EQE)) {
                        eq_set_ci(eq, 0);
                        set_ci = 0;
                }
        }

        eq_set_ci(eq, 1);

        return eqes_found;
}

static irqreturn_t mlx4_interrupt(int irq, void *dev_ptr)
{
        struct mlx4_dev *dev = dev_ptr;
        struct mlx4_priv *priv = mlx4_priv(dev);
        int work = 0;
        int i;

        writel(priv->eq_table.clr_mask, priv->eq_table.clr_int);

        for (i = 0; i < dev->caps.num_comp_vectors + 1; ++i)
                work |= mlx4_eq_int(dev, &priv->eq_table.eq[i]);

        return IRQ_RETVAL(work);
}

static irqreturn_t mlx4_msi_x_interrupt(int irq, void *eq_ptr)
{
        struct mlx4_eq  *eq  = eq_ptr;
        struct mlx4_dev *dev = eq->dev;

        mlx4_eq_int(dev, eq);

        /* MSI-X vectors always belong to us */
        return IRQ_HANDLED;
}

static int mlx4_MAP_EQ(struct mlx4_dev *dev, u64 event_mask, int unmap,
                        int eq_num)
{
        return mlx4_cmd(dev, event_mask, (unmap << 31) | eq_num,
                        0, MLX4_CMD_MAP_EQ, MLX4_CMD_TIME_CLASS_B);
}

static int mlx4_SW2HW_EQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
                         int eq_num)
{
        return mlx4_cmd(dev, mailbox->dma, eq_num, 0, MLX4_CMD_SW2HW_EQ,
                        MLX4_CMD_TIME_CLASS_A);
}

static int mlx4_HW2SW_EQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
                         int eq_num)
{
        return mlx4_cmd_box(dev, 0, mailbox->dma, eq_num, 0, MLX4_CMD_HW2SW_EQ,
                            MLX4_CMD_TIME_CLASS_A);
}

static int mlx4_num_eq_uar(struct mlx4_dev *dev)
{
        /*
         * Each UAR holds 4 EQ doorbells.  To figure out how many UARs
         * we need to map, take the difference of highest index and
         * the lowest index we'll use and add 1.
         */
        return (dev->caps.num_comp_vectors + 1 + dev->caps.reserved_eqs +
                 dev->caps.comp_pool)/4 - dev->caps.reserved_eqs/4 + 1;
}

static void __iomem *mlx4_get_eq_uar(struct mlx4_dev *dev, struct mlx4_eq *eq)
{
        struct mlx4_priv *priv = mlx4_priv(dev);
        int index;

        index = eq->eqn / 4 - dev->caps.reserved_eqs / 4;

        if (!priv->eq_table.uar_map[index]) {
                priv->eq_table.uar_map[index] =
                        ioremap(pci_resource_start(dev->pdev, 2) +
                                ((eq->eqn / 4) << PAGE_SHIFT),
                                PAGE_SIZE);
                if (!priv->eq_table.uar_map[index]) {
                        mlx4_err(dev, "Couldn't map EQ doorbell for EQN 0x%06x\n",
                                 eq->eqn);
                        return NULL;
                }
        }

        return priv->eq_table.uar_map[index] + 0x800 + 8 * (eq->eqn % 4);
}

static int mlx4_create_eq(struct mlx4_dev *dev, int nent,
                          u8 intr, struct mlx4_eq *eq)
{
        struct mlx4_priv *priv = mlx4_priv(dev);
        struct mlx4_cmd_mailbox *mailbox;
        struct mlx4_eq_context *eq_context;
        int npages;
        u64 *dma_list = NULL;
        dma_addr_t t;
        u64 mtt_addr;
        int err = -ENOMEM;
        int i;

        eq->dev   = dev;
        eq->nent  = roundup_pow_of_two(max(nent, 2));
        npages = PAGE_ALIGN(eq->nent * MLX4_EQ_ENTRY_SIZE) / PAGE_SIZE;

        eq->page_list = kmalloc(npages * sizeof *eq->page_list,
                                GFP_KERNEL);
        if (!eq->page_list)
                goto err_out;

        for (i = 0; i < npages; ++i)
                eq->page_list[i].buf = NULL;

        dma_list = kmalloc(npages * sizeof *dma_list, GFP_KERNEL);
        if (!dma_list)
                goto err_out_free;

        mailbox = mlx4_alloc_cmd_mailbox(dev);
        if (IS_ERR(mailbox))
                goto err_out_free;
        eq_context = mailbox->buf;

        for (i = 0; i < npages; ++i) {
                eq->page_list[i].buf = dma_alloc_coherent(&dev->pdev->dev,
                                                          PAGE_SIZE, &t, GFP_KERNEL);
                if (!eq->page_list[i].buf)
                        goto err_out_free_pages;

                dma_list[i] = t;
                eq->page_list[i].map = t;

                memset(eq->page_list[i].buf, 0, PAGE_SIZE);
        }

        eq->eqn = mlx4_bitmap_alloc(&priv->eq_table.bitmap);
        if (eq->eqn == -1)
                goto err_out_free_pages;

        eq->doorbell = mlx4_get_eq_uar(dev, eq);
        if (!eq->doorbell) {
                err = -ENOMEM;
                goto err_out_free_eq;
        }

        err = mlx4_mtt_init(dev, npages, PAGE_SHIFT, &eq->mtt);
        if (err)
                goto err_out_free_eq;

        err = mlx4_write_mtt(dev, &eq->mtt, 0, npages, dma_list);
        if (err)
                goto err_out_free_mtt;

        memset(eq_context, 0, sizeof *eq_context);
        eq_context->flags         = cpu_to_be32(MLX4_EQ_STATUS_OK   |
                                                MLX4_EQ_STATE_ARMED);
        eq_context->log_eq_size   = ilog2(eq->nent);
        eq_context->intr          = intr;
        eq_context->log_page_size = PAGE_SHIFT - MLX4_ICM_PAGE_SHIFT;

        mtt_addr = mlx4_mtt_addr(dev, &eq->mtt);
        eq_context->mtt_base_addr_h = mtt_addr >> 32;
        eq_context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff);

        err = mlx4_SW2HW_EQ(dev, mailbox, eq->eqn);
        if (err) {
                mlx4_warn(dev, "SW2HW_EQ failed (%d)\n", err);
                goto err_out_free_mtt;
        }

        kfree(dma_list);
        mlx4_free_cmd_mailbox(dev, mailbox);

        eq->cons_index = 0;

        return err;

err_out_free_mtt:
        mlx4_mtt_cleanup(dev, &eq->mtt);

err_out_free_eq:
        mlx4_bitmap_free(&priv->eq_table.bitmap, eq->eqn);

err_out_free_pages:
        for (i = 0; i < npages; ++i)
                if (eq->page_list[i].buf)
                        dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
                                          eq->page_list[i].buf,
                                          eq->page_list[i].map);

        mlx4_free_cmd_mailbox(dev, mailbox);

err_out_free:
        kfree(eq->page_list);
        kfree(dma_list);

err_out:
        return err;
}

static void mlx4_free_eq(struct mlx4_dev *dev,
                         struct mlx4_eq *eq)
{
        struct mlx4_priv *priv = mlx4_priv(dev);
        struct mlx4_cmd_mailbox *mailbox;
        int err;
        int npages = PAGE_ALIGN(MLX4_EQ_ENTRY_SIZE * eq->nent) / PAGE_SIZE;
        int i;

        mailbox = mlx4_alloc_cmd_mailbox(dev);
        if (IS_ERR(mailbox))
                return;

        err = mlx4_HW2SW_EQ(dev, mailbox, eq->eqn);
        if (err)
                mlx4_warn(dev, "HW2SW_EQ failed (%d)\n", err);

        if (0) {
                mlx4_dbg(dev, "Dumping EQ context %02x:\n", eq->eqn);
                for (i = 0; i < sizeof (struct mlx4_eq_context) / 4; ++i) {
                        if (i % 4 == 0)
                                pr_cont("[%02x] ", i * 4);
                        pr_cont(" %08x", be32_to_cpup(mailbox->buf + i * 4));
                        if ((i + 1) % 4 == 0)
                                pr_cont("\n");
                }
        }

        mlx4_mtt_cleanup(dev, &eq->mtt);
        for (i = 0; i < npages; ++i)
                pci_free_consistent(dev->pdev, PAGE_SIZE,
                                    eq->page_list[i].buf,
                                    eq->page_list[i].map);

        kfree(eq->page_list);
        mlx4_bitmap_free(&priv->eq_table.bitmap, eq->eqn);
        mlx4_free_cmd_mailbox(dev, mailbox);
}

static void mlx4_free_irqs(struct mlx4_dev *dev)
{
        struct mlx4_eq_table *eq_table = &mlx4_priv(dev)->eq_table;
        struct mlx4_priv *priv = mlx4_priv(dev);
        int     i, vec;

        if (eq_table->have_irq)
                free_irq(dev->pdev->irq, dev);

        for (i = 0; i < dev->caps.num_comp_vectors + 1; ++i)
                if (eq_table->eq[i].have_irq) {
                        free_irq(eq_table->eq[i].irq, eq_table->eq + i);
                        eq_table->eq[i].have_irq = 0;
                }

        for (i = 0; i < dev->caps.comp_pool; i++) {
                /*
                 * Freeing the assigned irq's
                 * all bits should be 0, but we need to validate
                 */
                if (priv->msix_ctl.pool_bm & 1ULL << i) {
                        /* NO need protecting*/
                        vec = dev->caps.num_comp_vectors + 1 + i;
                        free_irq(priv->eq_table.eq[vec].irq,
                                 &priv->eq_table.eq[vec]);
                }
        }


        kfree(eq_table->irq_names);
}

static int mlx4_map_clr_int(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);

        priv->clr_base = ioremap(pci_resource_start(dev->pdev, priv->fw.clr_int_bar) +
                                 priv->fw.clr_int_base, MLX4_CLR_INT_SIZE);
        if (!priv->clr_base) {
                mlx4_err(dev, "Couldn't map interrupt clear register, aborting.\n");
                return -ENOMEM;
        }

        return 0;
}

static void mlx4_unmap_clr_int(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);

        iounmap(priv->clr_base);
}

int mlx4_alloc_eq_table(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);

        priv->eq_table.eq = kcalloc(dev->caps.num_eqs - dev->caps.reserved_eqs,
                                    sizeof *priv->eq_table.eq, GFP_KERNEL);
        if (!priv->eq_table.eq)
                return -ENOMEM;

        return 0;
}

void mlx4_free_eq_table(struct mlx4_dev *dev)
{
        kfree(mlx4_priv(dev)->eq_table.eq);
}

int mlx4_init_eq_table(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);
        int err;
        int i;

        priv->eq_table.uar_map = kcalloc(sizeof *priv->eq_table.uar_map,
                                         mlx4_num_eq_uar(dev), GFP_KERNEL);
        if (!priv->eq_table.uar_map) {
                err = -ENOMEM;
                goto err_out_free;
        }

        err = mlx4_bitmap_init(&priv->eq_table.bitmap, dev->caps.num_eqs,
                               dev->caps.num_eqs - 1, dev->caps.reserved_eqs, 0);
        if (err)
                goto err_out_free;

        for (i = 0; i < mlx4_num_eq_uar(dev); ++i)
                priv->eq_table.uar_map[i] = NULL;

        err = mlx4_map_clr_int(dev);
        if (err)
                goto err_out_bitmap;

        priv->eq_table.clr_mask =
                swab32(1 << (priv->eq_table.inta_pin & 31));
        priv->eq_table.clr_int  = priv->clr_base +
                (priv->eq_table.inta_pin < 32 ? 4 : 0);

        priv->eq_table.irq_names =
                kmalloc(MLX4_IRQNAME_SIZE * (dev->caps.num_comp_vectors + 1 +
                                             dev->caps.comp_pool),
                        GFP_KERNEL);
        if (!priv->eq_table.irq_names) {
                err = -ENOMEM;
                goto err_out_bitmap;
        }

        for (i = 0; i < dev->caps.num_comp_vectors; ++i) {
                err = mlx4_create_eq(dev, dev->caps.num_cqs -
                                          dev->caps.reserved_cqs +
                                          MLX4_NUM_SPARE_EQE,
                                     (dev->flags & MLX4_FLAG_MSI_X) ? i : 0,
                                     &priv->eq_table.eq[i]);
                if (err) {
                        --i;
                        goto err_out_unmap;
                }
        }

        err = mlx4_create_eq(dev, MLX4_NUM_ASYNC_EQE + MLX4_NUM_SPARE_EQE,
                             (dev->flags & MLX4_FLAG_MSI_X) ? dev->caps.num_comp_vectors : 0,
                             &priv->eq_table.eq[dev->caps.num_comp_vectors]);
        if (err)
                goto err_out_comp;

        /*if additional completion vectors poolsize is 0 this loop will not run*/
        for (i = dev->caps.num_comp_vectors + 1;
              i < dev->caps.num_comp_vectors + dev->caps.comp_pool + 1; ++i) {

                err = mlx4_create_eq(dev, dev->caps.num_cqs -
                                          dev->caps.reserved_cqs +
                                          MLX4_NUM_SPARE_EQE,
                                     (dev->flags & MLX4_FLAG_MSI_X) ? i : 0,
                                     &priv->eq_table.eq[i]);
                if (err) {
                        --i;
                        goto err_out_unmap;
                }
        }


        if (dev->flags & MLX4_FLAG_MSI_X) {
                const char *eq_name;

                for (i = 0; i < dev->caps.num_comp_vectors + 1; ++i) {
                        if (i < dev->caps.num_comp_vectors) {
                                snprintf(priv->eq_table.irq_names +
                                         i * MLX4_IRQNAME_SIZE,
                                         MLX4_IRQNAME_SIZE,
                                         "mlx4-comp-%d@pci:%s", i,
                                         pci_name(dev->pdev));
                        } else {
                                snprintf(priv->eq_table.irq_names +
                                         i * MLX4_IRQNAME_SIZE,
                                         MLX4_IRQNAME_SIZE,
                                         "mlx4-async@pci:%s",
                                         pci_name(dev->pdev));
                        }

                        eq_name = priv->eq_table.irq_names +
                                  i * MLX4_IRQNAME_SIZE;
                        err = request_irq(priv->eq_table.eq[i].irq,
                                          mlx4_msi_x_interrupt, 0, eq_name,
                                          priv->eq_table.eq + i);
                        if (err)
                                goto err_out_async;

                        priv->eq_table.eq[i].have_irq = 1;
                }
        } else {
                snprintf(priv->eq_table.irq_names,
                         MLX4_IRQNAME_SIZE,
                         DRV_NAME "@pci:%s",
                         pci_name(dev->pdev));
                err = request_irq(dev->pdev->irq, mlx4_interrupt,
                                  IRQF_SHARED, priv->eq_table.irq_names, dev);
                if (err)
                        goto err_out_async;

                priv->eq_table.have_irq = 1;
        }

        err = mlx4_MAP_EQ(dev, MLX4_ASYNC_EVENT_MASK, 0,
                          priv->eq_table.eq[dev->caps.num_comp_vectors].eqn);
        if (err)
                mlx4_warn(dev, "MAP_EQ for async EQ %d failed (%d)\n",
                           priv->eq_table.eq[dev->caps.num_comp_vectors].eqn, err);

        for (i = 0; i < dev->caps.num_comp_vectors + 1; ++i)
                eq_set_ci(&priv->eq_table.eq[i], 1);

        return 0;

err_out_async:
        mlx4_free_eq(dev, &priv->eq_table.eq[dev->caps.num_comp_vectors]);

err_out_comp:
        i = dev->caps.num_comp_vectors - 1;

err_out_unmap:
        while (i >= 0) {
                mlx4_free_eq(dev, &priv->eq_table.eq[i]);
                --i;
        }
        mlx4_unmap_clr_int(dev);
        mlx4_free_irqs(dev);

err_out_bitmap:
        mlx4_bitmap_cleanup(&priv->eq_table.bitmap);

err_out_free:
        kfree(priv->eq_table.uar_map);

        return err;
}

void mlx4_cleanup_eq_table(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);
        int i;

        mlx4_MAP_EQ(dev, MLX4_ASYNC_EVENT_MASK, 1,
                    priv->eq_table.eq[dev->caps.num_comp_vectors].eqn);

        mlx4_free_irqs(dev);

        for (i = 0; i < dev->caps.num_comp_vectors + dev->caps.comp_pool + 1; ++i)
                mlx4_free_eq(dev, &priv->eq_table.eq[i]);

        mlx4_unmap_clr_int(dev);

        for (i = 0; i < mlx4_num_eq_uar(dev); ++i)
                if (priv->eq_table.uar_map[i])
                        iounmap(priv->eq_table.uar_map[i]);

        mlx4_bitmap_cleanup(&priv->eq_table.bitmap);

        kfree(priv->eq_table.uar_map);
}

/* A test that verifies that we can accept interrupts on all
 * the irq vectors of the device.
 * Interrupts are checked using the NOP command.
 */
int mlx4_test_interrupts(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);
        int i;
        int err;

        err = mlx4_NOP(dev);
        /* When not in MSI_X, there is only one irq to check */
        if (!(dev->flags & MLX4_FLAG_MSI_X))
                return err;

        /* A loop over all completion vectors, for each vector we will check
         * whether it works by mapping command completions to that vector
         * and performing a NOP command
         */
        for(i = 0; !err && (i < dev->caps.num_comp_vectors); ++i) {
                /* Temporary use polling for command completions */
                mlx4_cmd_use_polling(dev);

                /* Map the new eq to handle all asyncronous events */
                err = mlx4_MAP_EQ(dev, MLX4_ASYNC_EVENT_MASK, 0,
                                  priv->eq_table.eq[i].eqn);
                if (err) {
                        mlx4_warn(dev, "Failed mapping eq for interrupt test\n");
                        mlx4_cmd_use_events(dev);
                        break;
                }

                /* Go back to using events */
                mlx4_cmd_use_events(dev);
                err = mlx4_NOP(dev);
        }

        /* Return to default */
        mlx4_MAP_EQ(dev, MLX4_ASYNC_EVENT_MASK, 0,
                    priv->eq_table.eq[dev->caps.num_comp_vectors].eqn);
        return err;
}
EXPORT_SYMBOL(mlx4_test_interrupts);

int mlx4_assign_eq(struct mlx4_dev *dev, char* name, int * vector)
{

        struct mlx4_priv *priv = mlx4_priv(dev);
        int vec = 0, err = 0, i;

        spin_lock(&priv->msix_ctl.pool_lock);
        for (i = 0; !vec && i < dev->caps.comp_pool; i++) {
                if (~priv->msix_ctl.pool_bm & 1ULL << i) {
                        priv->msix_ctl.pool_bm |= 1ULL << i;
                        vec = dev->caps.num_comp_vectors + 1 + i;
                        snprintf(priv->eq_table.irq_names +
                                        vec * MLX4_IRQNAME_SIZE,
                                        MLX4_IRQNAME_SIZE, "%s", name);
                        err = request_irq(priv->eq_table.eq[vec].irq,
                                          mlx4_msi_x_interrupt, 0,
                                          &priv->eq_table.irq_names[vec<<5],
                                          priv->eq_table.eq + vec);
                        if (err) {
                                /*zero out bit by fliping it*/
                                priv->msix_ctl.pool_bm ^= 1 << i;
                                vec = 0;
                                continue;
                                /*we dont want to break here*/
                        }
                        eq_set_ci(&priv->eq_table.eq[vec], 1);
                }
        }
        spin_unlock(&priv->msix_ctl.pool_lock);

        if (vec) {
                *vector = vec;
        } else {
                *vector = 0;
                err = (i == dev->caps.comp_pool) ? -ENOSPC : err;
        }
        return err;
}
EXPORT_SYMBOL(mlx4_assign_eq);

void mlx4_release_eq(struct mlx4_dev *dev, int vec)
{
        struct mlx4_priv *priv = mlx4_priv(dev);
        /*bm index*/
        int i = vec - dev->caps.num_comp_vectors - 1;

        if (likely(i >= 0)) {
                /*sanity check , making sure were not trying to free irq's
                  Belonging to a legacy EQ*/
                spin_lock(&priv->msix_ctl.pool_lock);
                if (priv->msix_ctl.pool_bm & 1ULL << i) {
                        free_irq(priv->eq_table.eq[vec].irq,
                                 &priv->eq_table.eq[vec]);
                        priv->msix_ctl.pool_bm &= ~(1ULL << i);
                }
                spin_unlock(&priv->msix_ctl.pool_lock);
        }

}
EXPORT_SYMBOL(mlx4_release_eq);