/*
 * Copyright (c) 2013-2015, Mellanox Technologies. 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/notifier.h>
#include <linux/module.h>
#include <linux/mlx5/driver.h>
#include <linux/mlx5/vport.h>
#include <linux/mlx5/eq.h>
#ifdef CONFIG_RFS_ACCEL
#include <linux/cpu_rmap.h>
#endif
#include "mlx5_core.h"
#include "lib/eq.h"
#include "fpga/core.h"
#include "eswitch.h"
#include "lib/clock.h"
#include "diag/fw_tracer.h"

enum {
        MLX5_EQE_OWNER_INIT_VAL = 0x1,
};

enum {
        MLX5_EQ_STATE_ARMED             = 0x9,
        MLX5_EQ_STATE_FIRED             = 0xa,
        MLX5_EQ_STATE_ALWAYS_ARMED      = 0xb,
};

enum {
        MLX5_EQ_DOORBEL_OFFSET  = 0x40,
};

/* budget must be smaller than MLX5_NUM_SPARE_EQE to guarantee that we update
 * the ci before we polled all the entries in the EQ. MLX5_NUM_SPARE_EQE is
 * used to set the EQ size, budget must be smaller than the EQ size.
 */
enum {
        MLX5_EQ_POLLING_BUDGET  = 128,
};

static_assert(MLX5_EQ_POLLING_BUDGET <= MLX5_NUM_SPARE_EQE);

struct mlx5_eq_table {
        struct list_head        comp_eqs_list;
        struct mlx5_eq_async    pages_eq;
        struct mlx5_eq_async    cmd_eq;
        struct mlx5_eq_async    async_eq;

        struct atomic_notifier_head nh[MLX5_EVENT_TYPE_MAX];

        /* Since CQ DB is stored in async_eq */
        struct mlx5_nb          cq_err_nb;

        struct mutex            lock; /* sync async eqs creations */
        int                     num_comp_eqs;
        struct mlx5_irq_table   *irq_table;
};

#define MLX5_ASYNC_EVENT_MASK ((1ull << MLX5_EVENT_TYPE_PATH_MIG)           | \
                               (1ull << MLX5_EVENT_TYPE_COMM_EST)           | \
                               (1ull << MLX5_EVENT_TYPE_SQ_DRAINED)         | \
                               (1ull << MLX5_EVENT_TYPE_CQ_ERROR)           | \
                               (1ull << MLX5_EVENT_TYPE_WQ_CATAS_ERROR)     | \
                               (1ull << MLX5_EVENT_TYPE_PATH_MIG_FAILED)    | \
                               (1ull << MLX5_EVENT_TYPE_WQ_INVAL_REQ_ERROR) | \
                               (1ull << MLX5_EVENT_TYPE_WQ_ACCESS_ERROR)    | \
                               (1ull << MLX5_EVENT_TYPE_PORT_CHANGE)        | \
                               (1ull << MLX5_EVENT_TYPE_SRQ_CATAS_ERROR)    | \
                               (1ull << MLX5_EVENT_TYPE_SRQ_LAST_WQE)       | \
                               (1ull << MLX5_EVENT_TYPE_SRQ_RQ_LIMIT))

static int mlx5_cmd_destroy_eq(struct mlx5_core_dev *dev, u8 eqn)
{
        u32 in[MLX5_ST_SZ_DW(destroy_eq_in)] = {};

        MLX5_SET(destroy_eq_in, in, opcode, MLX5_CMD_OP_DESTROY_EQ);
        MLX5_SET(destroy_eq_in, in, eq_number, eqn);
        return mlx5_cmd_exec_in(dev, destroy_eq, in);
}

/* caller must eventually call mlx5_cq_put on the returned cq */
static struct mlx5_core_cq *mlx5_eq_cq_get(struct mlx5_eq *eq, u32 cqn)
{
        struct mlx5_cq_table *table = &eq->cq_table;
        struct mlx5_core_cq *cq = NULL;

        rcu_read_lock();
        cq = radix_tree_lookup(&table->tree, cqn);
        if (likely(cq))
                mlx5_cq_hold(cq);
        rcu_read_unlock();

        return cq;
}

static int mlx5_eq_comp_int(struct notifier_block *nb,
                            __always_unused unsigned long action,
                            __always_unused void *data)
{
        struct mlx5_eq_comp *eq_comp =
                container_of(nb, struct mlx5_eq_comp, irq_nb);
        struct mlx5_eq *eq = &eq_comp->core;
        struct mlx5_eqe *eqe;
        int num_eqes = 0;
        u32 cqn = -1;

        eqe = next_eqe_sw(eq);
        if (!eqe)
                goto out;

        do {
                struct mlx5_core_cq *cq;

                /* Make sure we read EQ entry contents after we've
                 * checked the ownership bit.
                 */
                dma_rmb();
                /* Assume (eqe->type) is always MLX5_EVENT_TYPE_COMP */
                cqn = be32_to_cpu(eqe->data.comp.cqn) & 0xffffff;

                cq = mlx5_eq_cq_get(eq, cqn);
                if (likely(cq)) {
                        ++cq->arm_sn;
                        cq->comp(cq, eqe);
                        mlx5_cq_put(cq);
                } else {
                        dev_dbg_ratelimited(eq->dev->device,
                                            "Completion event for bogus CQ 0x%x\n", cqn);
                }

                ++eq->cons_index;

        } while ((++num_eqes < MLX5_EQ_POLLING_BUDGET) && (eqe = next_eqe_sw(eq)));

out:
        eq_update_ci(eq, 1);

        if (cqn != -1)
                tasklet_schedule(&eq_comp->tasklet_ctx.task);

        return 0;
}

/* Some architectures don't latch interrupts when they are disabled, so using
 * mlx5_eq_poll_irq_disabled could end up losing interrupts while trying to
 * avoid losing them.  It is not recommended to use it, unless this is the last
 * resort.
 */
u32 mlx5_eq_poll_irq_disabled(struct mlx5_eq_comp *eq)
{
        u32 count_eqe;

        disable_irq(eq->core.irqn);
        count_eqe = eq->core.cons_index;
        mlx5_eq_comp_int(&eq->irq_nb, 0, NULL);
        count_eqe = eq->core.cons_index - count_eqe;
        enable_irq(eq->core.irqn);

        return count_eqe;
}

static void mlx5_eq_async_int_lock(struct mlx5_eq_async *eq, bool recovery,
                                   unsigned long *flags)
        __acquires(&eq->lock)
{
        if (!recovery)
                spin_lock(&eq->lock);
        else
                spin_lock_irqsave(&eq->lock, *flags);
}

static void mlx5_eq_async_int_unlock(struct mlx5_eq_async *eq, bool recovery,
                                     unsigned long *flags)
        __releases(&eq->lock)
{
        if (!recovery)
                spin_unlock(&eq->lock);
        else
                spin_unlock_irqrestore(&eq->lock, *flags);
}

enum async_eq_nb_action {
        ASYNC_EQ_IRQ_HANDLER = 0,
        ASYNC_EQ_RECOVER = 1,
};

static int mlx5_eq_async_int(struct notifier_block *nb,
                             unsigned long action, void *data)
{
        struct mlx5_eq_async *eq_async =
                container_of(nb, struct mlx5_eq_async, irq_nb);
        struct mlx5_eq *eq = &eq_async->core;
        struct mlx5_eq_table *eqt;
        struct mlx5_core_dev *dev;
        struct mlx5_eqe *eqe;
        unsigned long flags = 0;
        int num_eqes = 0;
        bool recovery;

        dev = eq->dev;
        eqt = dev->priv.eq_table;

        recovery = action == ASYNC_EQ_RECOVER;
        mlx5_eq_async_int_lock(eq_async, recovery, &flags);

        eqe = next_eqe_sw(eq);
        if (!eqe)
                goto out;

        do {
                /*
                 * Make sure we read EQ entry contents after we've
                 * checked the ownership bit.
                 */
                dma_rmb();

                atomic_notifier_call_chain(&eqt->nh[eqe->type], eqe->type, eqe);
                atomic_notifier_call_chain(&eqt->nh[MLX5_EVENT_TYPE_NOTIFY_ANY], eqe->type, eqe);

                ++eq->cons_index;

        } while ((++num_eqes < MLX5_EQ_POLLING_BUDGET) && (eqe = next_eqe_sw(eq)));

out:
        eq_update_ci(eq, 1);
        mlx5_eq_async_int_unlock(eq_async, recovery, &flags);

        return unlikely(recovery) ? num_eqes : 0;
}

void mlx5_cmd_eq_recover(struct mlx5_core_dev *dev)
{
        struct mlx5_eq_async *eq = &dev->priv.eq_table->cmd_eq;
        int eqes;

        eqes = mlx5_eq_async_int(&eq->irq_nb, ASYNC_EQ_RECOVER, NULL);
        if (eqes)
                mlx5_core_warn(dev, "Recovered %d EQEs on cmd_eq\n", eqes);
}

static void init_eq_buf(struct mlx5_eq *eq)
{
        struct mlx5_eqe *eqe;
        int i;

        for (i = 0; i < eq->nent; i++) {
                eqe = get_eqe(eq, i);
                eqe->owner = MLX5_EQE_OWNER_INIT_VAL;
        }
}

static int
create_map_eq(struct mlx5_core_dev *dev, struct mlx5_eq *eq,
              struct mlx5_eq_param *param)
{
        struct mlx5_cq_table *cq_table = &eq->cq_table;
        u32 out[MLX5_ST_SZ_DW(create_eq_out)] = {0};
        struct mlx5_priv *priv = &dev->priv;
        u8 vecidx = param->irq_index;
        __be64 *pas;
        void *eqc;
        int inlen;
        u32 *in;
        int err;
        int i;

        /* Init CQ table */
        memset(cq_table, 0, sizeof(*cq_table));
        spin_lock_init(&cq_table->lock);
        INIT_RADIX_TREE(&cq_table->tree, GFP_ATOMIC);

        eq->nent = roundup_pow_of_two(param->nent + MLX5_NUM_SPARE_EQE);
        eq->cons_index = 0;
        err = mlx5_buf_alloc(dev, eq->nent * MLX5_EQE_SIZE, &eq->buf);
        if (err)
                return err;

        init_eq_buf(eq);

        inlen = MLX5_ST_SZ_BYTES(create_eq_in) +
                MLX5_FLD_SZ_BYTES(create_eq_in, pas[0]) * eq->buf.npages;

        in = kvzalloc(inlen, GFP_KERNEL);
        if (!in) {
                err = -ENOMEM;
                goto err_buf;
        }

        pas = (__be64 *)MLX5_ADDR_OF(create_eq_in, in, pas);
        mlx5_fill_page_array(&eq->buf, pas);

        MLX5_SET(create_eq_in, in, opcode, MLX5_CMD_OP_CREATE_EQ);
        if (!param->mask[0] && MLX5_CAP_GEN(dev, log_max_uctx))
                MLX5_SET(create_eq_in, in, uid, MLX5_SHARED_RESOURCE_UID);

        for (i = 0; i < 4; i++)
                MLX5_ARRAY_SET64(create_eq_in, in, event_bitmask, i,
                                 param->mask[i]);

        eqc = MLX5_ADDR_OF(create_eq_in, in, eq_context_entry);
        MLX5_SET(eqc, eqc, log_eq_size, ilog2(eq->nent));
        MLX5_SET(eqc, eqc, uar_page, priv->uar->index);
        MLX5_SET(eqc, eqc, intr, vecidx);
        MLX5_SET(eqc, eqc, log_page_size,
                 eq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT);

        err = mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
        if (err)
                goto err_in;

        eq->vecidx = vecidx;
        eq->eqn = MLX5_GET(create_eq_out, out, eq_number);
        eq->irqn = pci_irq_vector(dev->pdev, vecidx);
        eq->dev = dev;
        eq->doorbell = priv->uar->map + MLX5_EQ_DOORBEL_OFFSET;

        err = mlx5_debug_eq_add(dev, eq);
        if (err)
                goto err_eq;

        kvfree(in);
        return 0;

err_eq:
        mlx5_cmd_destroy_eq(dev, eq->eqn);

err_in:
        kvfree(in);

err_buf:
        mlx5_buf_free(dev, &eq->buf);
        return err;
}

/**
 * mlx5_eq_enable - Enable EQ for receiving EQEs
 * @dev : Device which owns the eq
 * @eq  : EQ to enable
 * @nb  : Notifier call block
 *
 * Must be called after EQ is created in device.
 *
 * @return: 0 if no error
 */
int mlx5_eq_enable(struct mlx5_core_dev *dev, struct mlx5_eq *eq,
                   struct notifier_block *nb)
{
        struct mlx5_eq_table *eq_table = dev->priv.eq_table;
        int err;

        err = mlx5_irq_attach_nb(eq_table->irq_table, eq->vecidx, nb);
        if (!err)
                eq_update_ci(eq, 1);

        return err;
}
EXPORT_SYMBOL(mlx5_eq_enable);

/**
 * mlx5_eq_disable - Disable EQ for receiving EQEs
 * @dev : Device which owns the eq
 * @eq  : EQ to disable
 * @nb  : Notifier call block
 *
 * Must be called before EQ is destroyed.
 */
void mlx5_eq_disable(struct mlx5_core_dev *dev, struct mlx5_eq *eq,
                     struct notifier_block *nb)
{
        struct mlx5_eq_table *eq_table = dev->priv.eq_table;

        mlx5_irq_detach_nb(eq_table->irq_table, eq->vecidx, nb);
}
EXPORT_SYMBOL(mlx5_eq_disable);

static int destroy_unmap_eq(struct mlx5_core_dev *dev, struct mlx5_eq *eq)
{
        int err;

        mlx5_debug_eq_remove(dev, eq);

        err = mlx5_cmd_destroy_eq(dev, eq->eqn);
        if (err)
                mlx5_core_warn(dev, "failed to destroy a previously created eq: eqn %d\n",
                               eq->eqn);
        synchronize_irq(eq->irqn);

        mlx5_buf_free(dev, &eq->buf);

        return err;
}

int mlx5_eq_add_cq(struct mlx5_eq *eq, struct mlx5_core_cq *cq)
{
        struct mlx5_cq_table *table = &eq->cq_table;
        int err;

        spin_lock(&table->lock);
        err = radix_tree_insert(&table->tree, cq->cqn, cq);
        spin_unlock(&table->lock);

        return err;
}

void mlx5_eq_del_cq(struct mlx5_eq *eq, struct mlx5_core_cq *cq)
{
        struct mlx5_cq_table *table = &eq->cq_table;
        struct mlx5_core_cq *tmp;

        spin_lock(&table->lock);
        tmp = radix_tree_delete(&table->tree, cq->cqn);
        spin_unlock(&table->lock);

        if (!tmp) {
                mlx5_core_dbg(eq->dev, "cq 0x%x not found in eq 0x%x tree\n",
                              eq->eqn, cq->cqn);
                return;
        }

        if (tmp != cq)
                mlx5_core_dbg(eq->dev, "corruption on cqn 0x%x in eq 0x%x\n",
                              eq->eqn, cq->cqn);
}

int mlx5_eq_table_init(struct mlx5_core_dev *dev)
{
        struct mlx5_eq_table *eq_table;
        int i;

        eq_table = kvzalloc(sizeof(*eq_table), GFP_KERNEL);
        if (!eq_table)
                return -ENOMEM;

        dev->priv.eq_table = eq_table;

        mlx5_eq_debugfs_init(dev);

        mutex_init(&eq_table->lock);
        for (i = 0; i < MLX5_EVENT_TYPE_MAX; i++)
                ATOMIC_INIT_NOTIFIER_HEAD(&eq_table->nh[i]);

        eq_table->irq_table = mlx5_irq_table_get(dev);
        return 0;
}

void mlx5_eq_table_cleanup(struct mlx5_core_dev *dev)
{
        mlx5_eq_debugfs_cleanup(dev);
        kvfree(dev->priv.eq_table);
}

/* Async EQs */

static int create_async_eq(struct mlx5_core_dev *dev,
                           struct mlx5_eq *eq, struct mlx5_eq_param *param)
{
        struct mlx5_eq_table *eq_table = dev->priv.eq_table;
        int err;

        mutex_lock(&eq_table->lock);
        /* Async EQs must share irq index 0 */
        if (param->irq_index != 0) {
                err = -EINVAL;
                goto unlock;
        }

        err = create_map_eq(dev, eq, param);
unlock:
        mutex_unlock(&eq_table->lock);
        return err;
}

static int destroy_async_eq(struct mlx5_core_dev *dev, struct mlx5_eq *eq)
{
        struct mlx5_eq_table *eq_table = dev->priv.eq_table;
        int err;

        mutex_lock(&eq_table->lock);
        err = destroy_unmap_eq(dev, eq);
        mutex_unlock(&eq_table->lock);
        return err;
}

static int cq_err_event_notifier(struct notifier_block *nb,
                                 unsigned long type, void *data)
{
        struct mlx5_eq_table *eqt;
        struct mlx5_core_cq *cq;
        struct mlx5_eqe *eqe;
        struct mlx5_eq *eq;
        u32 cqn;

        /* type == MLX5_EVENT_TYPE_CQ_ERROR */

        eqt = mlx5_nb_cof(nb, struct mlx5_eq_table, cq_err_nb);
        eq  = &eqt->async_eq.core;
        eqe = data;

        cqn = be32_to_cpu(eqe->data.cq_err.cqn) & 0xffffff;
        mlx5_core_warn(eq->dev, "CQ error on CQN 0x%x, syndrome 0x%x\n",
                       cqn, eqe->data.cq_err.syndrome);

        cq = mlx5_eq_cq_get(eq, cqn);
        if (unlikely(!cq)) {
                mlx5_core_warn(eq->dev, "Async event for bogus CQ 0x%x\n", cqn);
                return NOTIFY_OK;
        }

        if (cq->event)
                cq->event(cq, type);

        mlx5_cq_put(cq);

        return NOTIFY_OK;
}

static void gather_user_async_events(struct mlx5_core_dev *dev, u64 mask[4])
{
        __be64 *user_unaffiliated_events;
        __be64 *user_affiliated_events;
        int i;

        user_affiliated_events =
                MLX5_CAP_DEV_EVENT(dev, user_affiliated_events);
        user_unaffiliated_events =
                MLX5_CAP_DEV_EVENT(dev, user_unaffiliated_events);

        for (i = 0; i < 4; i++)
                mask[i] |= be64_to_cpu(user_affiliated_events[i] |
                                       user_unaffiliated_events[i]);
}

static void gather_async_events_mask(struct mlx5_core_dev *dev, u64 mask[4])
{
        u64 async_event_mask = MLX5_ASYNC_EVENT_MASK;

        if (MLX5_VPORT_MANAGER(dev))
                async_event_mask |= (1ull << MLX5_EVENT_TYPE_NIC_VPORT_CHANGE);

        if (MLX5_CAP_GEN(dev, general_notification_event))
                async_event_mask |= (1ull << MLX5_EVENT_TYPE_GENERAL_EVENT);

        if (MLX5_CAP_GEN(dev, port_module_event))
                async_event_mask |= (1ull << MLX5_EVENT_TYPE_PORT_MODULE_EVENT);
        else
                mlx5_core_dbg(dev, "port_module_event is not set\n");

        if (MLX5_PPS_CAP(dev))
                async_event_mask |= (1ull << MLX5_EVENT_TYPE_PPS_EVENT);

        if (MLX5_CAP_GEN(dev, fpga))
                async_event_mask |= (1ull << MLX5_EVENT_TYPE_FPGA_ERROR) |
                                    (1ull << MLX5_EVENT_TYPE_FPGA_QP_ERROR);
        if (MLX5_CAP_GEN_MAX(dev, dct))
                async_event_mask |= (1ull << MLX5_EVENT_TYPE_DCT_DRAINED);

        if (MLX5_CAP_GEN(dev, temp_warn_event))
                async_event_mask |= (1ull << MLX5_EVENT_TYPE_TEMP_WARN_EVENT);

        if (MLX5_CAP_MCAM_REG(dev, tracer_registers))
                async_event_mask |= (1ull << MLX5_EVENT_TYPE_DEVICE_TRACER);

        if (MLX5_CAP_GEN(dev, max_num_of_monitor_counters))
                async_event_mask |= (1ull << MLX5_EVENT_TYPE_MONITOR_COUNTER);

        if (mlx5_eswitch_is_funcs_handler(dev))
                async_event_mask |=
                        (1ull << MLX5_EVENT_TYPE_ESW_FUNCTIONS_CHANGED);

        if (MLX5_CAP_GEN_MAX(dev, vhca_state))
                async_event_mask |= (1ull << MLX5_EVENT_TYPE_VHCA_STATE_CHANGE);

        mask[0] = async_event_mask;

        if (MLX5_CAP_GEN(dev, event_cap))
                gather_user_async_events(dev, mask);
}

static int
setup_async_eq(struct mlx5_core_dev *dev, struct mlx5_eq_async *eq,
               struct mlx5_eq_param *param, const char *name)
{
        int err;

        eq->irq_nb.notifier_call = mlx5_eq_async_int;
        spin_lock_init(&eq->lock);

        err = create_async_eq(dev, &eq->core, param);
        if (err) {
                mlx5_core_warn(dev, "failed to create %s EQ %d\n", name, err);
                return err;
        }
        err = mlx5_eq_enable(dev, &eq->core, &eq->irq_nb);
        if (err) {
                mlx5_core_warn(dev, "failed to enable %s EQ %d\n", name, err);
                destroy_async_eq(dev, &eq->core);
        }
        return err;
}

static void cleanup_async_eq(struct mlx5_core_dev *dev,
                             struct mlx5_eq_async *eq, const char *name)
{
        int err;

        mlx5_eq_disable(dev, &eq->core, &eq->irq_nb);
        err = destroy_async_eq(dev, &eq->core);
        if (err)
                mlx5_core_err(dev, "failed to destroy %s eq, err(%d)\n",
                              name, err);
}

static int create_async_eqs(struct mlx5_core_dev *dev)
{
        struct mlx5_eq_table *table = dev->priv.eq_table;
        struct mlx5_eq_param param = {};
        int err;

        MLX5_NB_INIT(&table->cq_err_nb, cq_err_event_notifier, CQ_ERROR);
        mlx5_eq_notifier_register(dev, &table->cq_err_nb);

        param = (struct mlx5_eq_param) {
                .irq_index = 0,
                .nent = MLX5_NUM_CMD_EQE,
                .mask[0] = 1ull << MLX5_EVENT_TYPE_CMD,
        };
        mlx5_cmd_allowed_opcode(dev, MLX5_CMD_OP_CREATE_EQ);
        err = setup_async_eq(dev, &table->cmd_eq, &param, "cmd");
        if (err)
                goto err1;

        mlx5_cmd_use_events(dev);
        mlx5_cmd_allowed_opcode(dev, CMD_ALLOWED_OPCODE_ALL);

        param = (struct mlx5_eq_param) {
                .irq_index = 0,
                .nent = MLX5_NUM_ASYNC_EQE,
        };

        gather_async_events_mask(dev, param.mask);
        err = setup_async_eq(dev, &table->async_eq, &param, "async");
        if (err)
                goto err2;

        param = (struct mlx5_eq_param) {
                .irq_index = 0,
                .nent = /* TODO: sriov max_vf + */ 1,
                .mask[0] = 1ull << MLX5_EVENT_TYPE_PAGE_REQUEST,
        };

        err = setup_async_eq(dev, &table->pages_eq, &param, "pages");
        if (err)
                goto err3;

        return 0;

err3:
        cleanup_async_eq(dev, &table->async_eq, "async");
err2:
        mlx5_cmd_use_polling(dev);
        cleanup_async_eq(dev, &table->cmd_eq, "cmd");
err1:
        mlx5_cmd_allowed_opcode(dev, CMD_ALLOWED_OPCODE_ALL);
        mlx5_eq_notifier_unregister(dev, &table->cq_err_nb);
        return err;
}

static void destroy_async_eqs(struct mlx5_core_dev *dev)
{
        struct mlx5_eq_table *table = dev->priv.eq_table;

        cleanup_async_eq(dev, &table->pages_eq, "pages");
        cleanup_async_eq(dev, &table->async_eq, "async");
        mlx5_cmd_allowed_opcode(dev, MLX5_CMD_OP_DESTROY_EQ);
        mlx5_cmd_use_polling(dev);
        cleanup_async_eq(dev, &table->cmd_eq, "cmd");
        mlx5_cmd_allowed_opcode(dev, CMD_ALLOWED_OPCODE_ALL);
        mlx5_eq_notifier_unregister(dev, &table->cq_err_nb);
}

struct mlx5_eq *mlx5_get_async_eq(struct mlx5_core_dev *dev)
{
        return &dev->priv.eq_table->async_eq.core;
}

void mlx5_eq_synchronize_async_irq(struct mlx5_core_dev *dev)
{
        synchronize_irq(dev->priv.eq_table->async_eq.core.irqn);
}

void mlx5_eq_synchronize_cmd_irq(struct mlx5_core_dev *dev)
{
        synchronize_irq(dev->priv.eq_table->cmd_eq.core.irqn);
}

/* Generic EQ API for mlx5_core consumers
 * Needed For RDMA ODP EQ for now
 */
struct mlx5_eq *
mlx5_eq_create_generic(struct mlx5_core_dev *dev,
                       struct mlx5_eq_param *param)
{
        struct mlx5_eq *eq = kvzalloc(sizeof(*eq), GFP_KERNEL);
        int err;

        if (!eq)
                return ERR_PTR(-ENOMEM);

        err = create_async_eq(dev, eq, param);
        if (err) {
                kvfree(eq);
                eq = ERR_PTR(err);
        }

        return eq;
}
EXPORT_SYMBOL(mlx5_eq_create_generic);

int mlx5_eq_destroy_generic(struct mlx5_core_dev *dev, struct mlx5_eq *eq)
{
        int err;

        if (IS_ERR(eq))
                return -EINVAL;

        err = destroy_async_eq(dev, eq);
        if (err)
                goto out;

        kvfree(eq);
out:
        return err;
}
EXPORT_SYMBOL(mlx5_eq_destroy_generic);

struct mlx5_eqe *mlx5_eq_get_eqe(struct mlx5_eq *eq, u32 cc)
{
        u32 ci = eq->cons_index + cc;
        struct mlx5_eqe *eqe;

        eqe = get_eqe(eq, ci & (eq->nent - 1));
        eqe = ((eqe->owner & 1) ^ !!(ci & eq->nent)) ? NULL : eqe;
        /* Make sure we read EQ entry contents after we've
         * checked the ownership bit.
         */
        if (eqe)
                dma_rmb();

        return eqe;
}
EXPORT_SYMBOL(mlx5_eq_get_eqe);

void mlx5_eq_update_ci(struct mlx5_eq *eq, u32 cc, bool arm)
{
        __be32 __iomem *addr = eq->doorbell + (arm ? 0 : 2);
        u32 val;

        eq->cons_index += cc;
        val = (eq->cons_index & 0xffffff) | (eq->eqn << 24);

        __raw_writel((__force u32)cpu_to_be32(val), addr);
        /* We still want ordering, just not swabbing, so add a barrier */
        wmb();
}
EXPORT_SYMBOL(mlx5_eq_update_ci);

static void destroy_comp_eqs(struct mlx5_core_dev *dev)
{
        struct mlx5_eq_table *table = dev->priv.eq_table;
        struct mlx5_eq_comp *eq, *n;

        list_for_each_entry_safe(eq, n, &table->comp_eqs_list, list) {
                list_del(&eq->list);
                mlx5_eq_disable(dev, &eq->core, &eq->irq_nb);
                if (destroy_unmap_eq(dev, &eq->core))
                        mlx5_core_warn(dev, "failed to destroy comp EQ 0x%x\n",
                                       eq->core.eqn);
                tasklet_disable(&eq->tasklet_ctx.task);
                kfree(eq);
        }
}

static int create_comp_eqs(struct mlx5_core_dev *dev)
{
        struct mlx5_eq_table *table = dev->priv.eq_table;
        struct mlx5_eq_comp *eq;
        int ncomp_eqs;
        int nent;
        int err;
        int i;

        INIT_LIST_HEAD(&table->comp_eqs_list);
        ncomp_eqs = table->num_comp_eqs;
        nent = MLX5_COMP_EQ_SIZE;
        for (i = 0; i < ncomp_eqs; i++) {
                int vecidx = i + MLX5_IRQ_VEC_COMP_BASE;
                struct mlx5_eq_param param = {};

                eq = kzalloc(sizeof(*eq), GFP_KERNEL);
                if (!eq) {
                        err = -ENOMEM;
                        goto clean;
                }

                INIT_LIST_HEAD(&eq->tasklet_ctx.list);
                INIT_LIST_HEAD(&eq->tasklet_ctx.process_list);
                spin_lock_init(&eq->tasklet_ctx.lock);
                tasklet_init(&eq->tasklet_ctx.task, mlx5_cq_tasklet_cb,
                             (unsigned long)&eq->tasklet_ctx);

                eq->irq_nb.notifier_call = mlx5_eq_comp_int;
                param = (struct mlx5_eq_param) {
                        .irq_index = vecidx,
                        .nent = nent,
                };
                err = create_map_eq(dev, &eq->core, &param);
                if (err) {
                        kfree(eq);
                        goto clean;
                }
                err = mlx5_eq_enable(dev, &eq->core, &eq->irq_nb);
                if (err) {
                        destroy_unmap_eq(dev, &eq->core);
                        kfree(eq);
                        goto clean;
                }

                mlx5_core_dbg(dev, "allocated completion EQN %d\n", eq->core.eqn);
                /* add tail, to keep the list ordered, for mlx5_vector2eqn to work */
                list_add_tail(&eq->list, &table->comp_eqs_list);
        }

        return 0;

clean:
        destroy_comp_eqs(dev);
        return err;
}

int mlx5_vector2eqn(struct mlx5_core_dev *dev, int vector, int *eqn,
                    unsigned int *irqn)
{
        struct mlx5_eq_table *table = dev->priv.eq_table;
        struct mlx5_eq_comp *eq, *n;
        int err = -ENOENT;
        int i = 0;

        list_for_each_entry_safe(eq, n, &table->comp_eqs_list, list) {
                if (i++ == vector) {
                        *eqn = eq->core.eqn;
                        *irqn = eq->core.irqn;
                        err = 0;
                        break;
                }
        }

        return err;
}
EXPORT_SYMBOL(mlx5_vector2eqn);

unsigned int mlx5_comp_vectors_count(struct mlx5_core_dev *dev)
{
        return dev->priv.eq_table->num_comp_eqs;
}
EXPORT_SYMBOL(mlx5_comp_vectors_count);

struct cpumask *
mlx5_comp_irq_get_affinity_mask(struct mlx5_core_dev *dev, int vector)
{
        int vecidx = vector + MLX5_IRQ_VEC_COMP_BASE;

        return mlx5_irq_get_affinity_mask(dev->priv.eq_table->irq_table,
                                          vecidx);
}
EXPORT_SYMBOL(mlx5_comp_irq_get_affinity_mask);

#ifdef CONFIG_RFS_ACCEL
struct cpu_rmap *mlx5_eq_table_get_rmap(struct mlx5_core_dev *dev)
{
        return mlx5_irq_get_rmap(dev->priv.eq_table->irq_table);
}
#endif

struct mlx5_eq_comp *mlx5_eqn2comp_eq(struct mlx5_core_dev *dev, int eqn)
{
        struct mlx5_eq_table *table = dev->priv.eq_table;
        struct mlx5_eq_comp *eq;

        list_for_each_entry(eq, &table->comp_eqs_list, list) {
                if (eq->core.eqn == eqn)
                        return eq;
        }

        return ERR_PTR(-ENOENT);
}

/* This function should only be called after mlx5_cmd_force_teardown_hca */
void mlx5_core_eq_free_irqs(struct mlx5_core_dev *dev)
{
        struct mlx5_eq_table *table = dev->priv.eq_table;

        mutex_lock(&table->lock); /* sync with create/destroy_async_eq */
        mlx5_irq_table_destroy(dev);
        mutex_unlock(&table->lock);
}

#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
#define MLX5_MAX_ASYNC_EQS 4
#else
#define MLX5_MAX_ASYNC_EQS 3
#endif

int mlx5_eq_table_create(struct mlx5_core_dev *dev)
{
        struct mlx5_eq_table *eq_table = dev->priv.eq_table;
        int num_eqs = MLX5_CAP_GEN(dev, max_num_eqs) ?
                      MLX5_CAP_GEN(dev, max_num_eqs) :
                      1 << MLX5_CAP_GEN(dev, log_max_eq);
        int err;

        eq_table->num_comp_eqs =
                min_t(int,
                      mlx5_irq_get_num_comp(eq_table->irq_table),
                      num_eqs - MLX5_MAX_ASYNC_EQS);

        err = create_async_eqs(dev);
        if (err) {
                mlx5_core_err(dev, "Failed to create async EQs\n");
                goto err_async_eqs;
        }

        err = create_comp_eqs(dev);
        if (err) {
                mlx5_core_err(dev, "Failed to create completion EQs\n");
                goto err_comp_eqs;
        }

        return 0;
err_comp_eqs:
        destroy_async_eqs(dev);
err_async_eqs:
        return err;
}

void mlx5_eq_table_destroy(struct mlx5_core_dev *dev)
{
        destroy_comp_eqs(dev);
        destroy_async_eqs(dev);
}

int mlx5_eq_notifier_register(struct mlx5_core_dev *dev, struct mlx5_nb *nb)
{
        struct mlx5_eq_table *eqt = dev->priv.eq_table;

        return atomic_notifier_chain_register(&eqt->nh[nb->event_type], &nb->nb);
}
EXPORT_SYMBOL(mlx5_eq_notifier_register);

int mlx5_eq_notifier_unregister(struct mlx5_core_dev *dev, struct mlx5_nb *nb)
{
        struct mlx5_eq_table *eqt = dev->priv.eq_table;

        return atomic_notifier_chain_unregister(&eqt->nh[nb->event_type], &nb->nb);
}
EXPORT_SYMBOL(mlx5_eq_notifier_unregister);