xref: /linux-6.12.1/drivers/net/ethernet/mellanox/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/export.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>

#include <linux/mlx4/cmd.h>
#include <linux/cpu_rmap.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
};

#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)		    | \
			       (1ull << MLX4_EVENT_TYPE_OP_REQUIRED)	    | \
			       (1ull << MLX4_EVENT_TYPE_COMM_CHANNEL)       | \
			       (1ull << MLX4_EVENT_TYPE_FLR_EVENT)	    | \
			       (1ull << MLX4_EVENT_TYPE_FATAL_WARNING))

static u64 get_async_ev_mask(struct mlx4_dev *dev)
{
	u64 async_ev_mask = MLX4_ASYNC_EVENT_MASK;
	if (dev->caps.flags & MLX4_DEV_CAP_FLAG_PORT_MNG_CHG_EV)
		async_ev_mask |= (1ull << MLX4_EVENT_TYPE_PORT_MNG_CHG_EVENT);
	if (dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_RECOVERABLE_ERROR_EVENT)
		async_ev_mask |= (1ull << MLX4_EVENT_TYPE_RECOVERABLE_ERROR_EVENT);

	return async_ev_mask;
}

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 */
	wmb();
}

static struct mlx4_eqe *get_eqe(struct mlx4_eq *eq, u32 entry, u8 eqe_factor,
				u8 eqe_size)
{
	/* (entry & (eq->nent - 1)) gives us a cyclic array */
	unsigned long offset = (entry & (eq->nent - 1)) * eqe_size;
	/* CX3 is capable of extending the EQE from 32 to 64 bytes with
	 * strides of 64B,128B and 256B.
	 * When 64B EQE is used, the first (in the lower addresses)
	 * 32 bytes in the 64 byte EQE are reserved and the next 32 bytes
	 * contain the legacy EQE information.
	 * In all other cases, the first 32B contains the legacy EQE info.
	 */
	return eq->page_list[offset / PAGE_SIZE].buf + (offset + (eqe_factor ? MLX4_EQ_ENTRY_SIZE : 0)) % PAGE_SIZE;
}

static struct mlx4_eqe *next_eqe_sw(struct mlx4_eq *eq, u8 eqe_factor, u8 size)
{
	struct mlx4_eqe *eqe = get_eqe(eq, eq->cons_index, eqe_factor, size);
	return !!(eqe->owner & 0x80) ^ !!(eq->cons_index & eq->nent) ? NULL : eqe;
}

static struct mlx4_eqe *next_slave_event_eqe(struct mlx4_slave_event_eq *slave_eq)
{
	struct mlx4_eqe *eqe =
		&slave_eq->event_eqe[slave_eq->cons & (SLAVE_EVENT_EQ_SIZE - 1)];
	return (!!(eqe->owner & 0x80) ^
		!!(slave_eq->cons & SLAVE_EVENT_EQ_SIZE)) ?
		eqe : NULL;
}

void mlx4_gen_slave_eqe(struct work_struct *work)
{
	struct mlx4_mfunc_master_ctx *master =
		container_of(work, struct mlx4_mfunc_master_ctx,
			     slave_event_work);
	struct mlx4_mfunc *mfunc =
		container_of(master, struct mlx4_mfunc, master);
	struct mlx4_priv *priv = container_of(mfunc, struct mlx4_priv, mfunc);
	struct mlx4_dev *dev = &priv->dev;
	struct mlx4_slave_event_eq *slave_eq = &mfunc->master.slave_eq;
	struct mlx4_eqe *eqe;
	u8 slave;
	int i, phys_port, slave_port;

	for (eqe = next_slave_event_eqe(slave_eq); eqe;
	      eqe = next_slave_event_eqe(slave_eq)) {
		slave = eqe->slave_id;

		if (eqe->type == MLX4_EVENT_TYPE_PORT_CHANGE &&
		    eqe->subtype == MLX4_PORT_CHANGE_SUBTYPE_DOWN &&
		    mlx4_is_bonded(dev)) {
			struct mlx4_port_cap port_cap;

			if (!mlx4_QUERY_PORT(dev, 1, &port_cap) && port_cap.link_state)
				goto consume;

			if (!mlx4_QUERY_PORT(dev, 2, &port_cap) && port_cap.link_state)
				goto consume;
		}
		/* All active slaves need to receive the event */
		if (slave == ALL_SLAVES) {
			for (i = 0; i <= dev->persist->num_vfs; i++) {
				phys_port = 0;
				if (eqe->type == MLX4_EVENT_TYPE_PORT_MNG_CHG_EVENT &&
				    eqe->subtype == MLX4_DEV_PMC_SUBTYPE_PORT_INFO) {
					phys_port  = eqe->event.port_mgmt_change.port;
					slave_port = mlx4_phys_to_slave_port(dev, i, phys_port);
					if (slave_port < 0) /* VF doesn't have this port */
						continue;
					eqe->event.port_mgmt_change.port = slave_port;
				}
				if (mlx4_GEN_EQE(dev, i, eqe))
					mlx4_warn(dev, "Failed to generate event for slave %d\n",
						  i);
				if (phys_port)
					eqe->event.port_mgmt_change.port = phys_port;
			}
		} else {
			if (mlx4_GEN_EQE(dev, slave, eqe))
				mlx4_warn(dev, "Failed to generate event for slave %d\n",
					  slave);
		}
consume:
		++slave_eq->cons;
	}
}


static void slave_event(struct mlx4_dev *dev, u8 slave, struct mlx4_eqe *eqe)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_slave_event_eq *slave_eq = &priv->mfunc.master.slave_eq;
	struct mlx4_eqe *s_eqe;
	unsigned long flags;

	spin_lock_irqsave(&slave_eq->event_lock, flags);
	s_eqe = &slave_eq->event_eqe[slave_eq->prod & (SLAVE_EVENT_EQ_SIZE - 1)];
	if ((!!(s_eqe->owner & 0x80)) ^
	    (!!(slave_eq->prod & SLAVE_EVENT_EQ_SIZE))) {
		mlx4_warn(dev, "Master failed to generate an EQE for slave: %d. No free EQE on slave events queue\n",
			  slave);
		spin_unlock_irqrestore(&slave_eq->event_lock, flags);
		return;
	}

	memcpy(s_eqe, eqe, sizeof(struct mlx4_eqe) - 1);
	s_eqe->slave_id = slave;
	/* ensure all information is written before setting the ownership bit */
	dma_wmb();
	s_eqe->owner = !!(slave_eq->prod & SLAVE_EVENT_EQ_SIZE) ? 0x0 : 0x80;
	++slave_eq->prod;

	queue_work(priv->mfunc.master.comm_wq,
		   &priv->mfunc.master.slave_event_work);
	spin_unlock_irqrestore(&slave_eq->event_lock, flags);
}

static void mlx4_slave_event(struct mlx4_dev *dev, int slave,
			     struct mlx4_eqe *eqe)
{
	struct mlx4_priv *priv = mlx4_priv(dev);

	if (slave < 0 || slave > dev->persist->num_vfs ||
	    slave == dev->caps.function ||
	    !priv->mfunc.master.slave_state[slave].active)
		return;

	slave_event(dev, slave, eqe);
}

#if defined(CONFIG_SMP)
static void mlx4_set_eq_affinity_hint(struct mlx4_priv *priv, int vec)
{
	int hint_err;
	struct mlx4_dev *dev = &priv->dev;
	struct mlx4_eq *eq = &priv->eq_table.eq[vec];

	if (!cpumask_available(eq->affinity_mask) ||
	    cpumask_empty(eq->affinity_mask))
		return;

	hint_err = irq_update_affinity_hint(eq->irq, eq->affinity_mask);
	if (hint_err)
		mlx4_warn(dev, "irq_update_affinity_hint failed, err %d\n", hint_err);
}
#endif

int mlx4_gen_pkey_eqe(struct mlx4_dev *dev, int slave, u8 port)
{
	struct mlx4_eqe eqe;

	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_slave_state *s_slave = &priv->mfunc.master.slave_state[slave];

	if (!s_slave->active)
		return 0;

	memset(&eqe, 0, sizeof(eqe));

	eqe.type = MLX4_EVENT_TYPE_PORT_MNG_CHG_EVENT;
	eqe.subtype = MLX4_DEV_PMC_SUBTYPE_PKEY_TABLE;
	eqe.event.port_mgmt_change.port = mlx4_phys_to_slave_port(dev, slave, port);

	return mlx4_GEN_EQE(dev, slave, &eqe);
}
EXPORT_SYMBOL(mlx4_gen_pkey_eqe);

int mlx4_gen_guid_change_eqe(struct mlx4_dev *dev, int slave, u8 port)
{
	struct mlx4_eqe eqe;

	/*don't send if we don't have the that slave */
	if (dev->persist->num_vfs < slave)
		return 0;
	memset(&eqe, 0, sizeof(eqe));

	eqe.type = MLX4_EVENT_TYPE_PORT_MNG_CHG_EVENT;
	eqe.subtype = MLX4_DEV_PMC_SUBTYPE_GUID_INFO;
	eqe.event.port_mgmt_change.port = mlx4_phys_to_slave_port(dev, slave, port);

	return mlx4_GEN_EQE(dev, slave, &eqe);
}
EXPORT_SYMBOL(mlx4_gen_guid_change_eqe);

int mlx4_gen_port_state_change_eqe(struct mlx4_dev *dev, int slave, u8 port,
				   u8 port_subtype_change)
{
	struct mlx4_eqe eqe;
	u8 slave_port = mlx4_phys_to_slave_port(dev, slave, port);

	/*don't send if we don't have the that slave */
	if (dev->persist->num_vfs < slave)
		return 0;
	memset(&eqe, 0, sizeof(eqe));

	eqe.type = MLX4_EVENT_TYPE_PORT_CHANGE;
	eqe.subtype = port_subtype_change;
	eqe.event.port_change.port = cpu_to_be32(slave_port << 28);

	mlx4_dbg(dev, "%s: sending: %d to slave: %d on port: %d\n", __func__,
		 port_subtype_change, slave, port);
	return mlx4_GEN_EQE(dev, slave, &eqe);
}
EXPORT_SYMBOL(mlx4_gen_port_state_change_eqe);

enum slave_port_state mlx4_get_slave_port_state(struct mlx4_dev *dev, int slave, u8 port)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_slave_state *s_state = priv->mfunc.master.slave_state;
	struct mlx4_active_ports actv_ports = mlx4_get_active_ports(dev, slave);

	if (slave >= dev->num_slaves || port > dev->caps.num_ports ||
	    port <= 0 || !test_bit(port - 1, actv_ports.ports)) {
		pr_err("%s: Error: asking for slave:%d, port:%d\n",
		       __func__, slave, port);
		return SLAVE_PORT_DOWN;
	}
	return s_state[slave].port_state[port];
}
EXPORT_SYMBOL(mlx4_get_slave_port_state);

static int mlx4_set_slave_port_state(struct mlx4_dev *dev, int slave, u8 port,
				     enum slave_port_state state)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_slave_state *s_state = priv->mfunc.master.slave_state;
	struct mlx4_active_ports actv_ports = mlx4_get_active_ports(dev, slave);

	if (slave >= dev->num_slaves || port > dev->caps.num_ports ||
	    port <= 0 || !test_bit(port - 1, actv_ports.ports)) {
		pr_err("%s: Error: asking for slave:%d, port:%d\n",
		       __func__, slave, port);
		return -1;
	}
	s_state[slave].port_state[port] = state;

	return 0;
}

static void set_all_slave_state(struct mlx4_dev *dev, u8 port, int event)
{
	int i;
	enum slave_port_gen_event gen_event;
	struct mlx4_slaves_pport slaves_pport = mlx4_phys_to_slaves_pport(dev,
									  port);

	for (i = 0; i < dev->persist->num_vfs + 1; i++)
		if (test_bit(i, slaves_pport.slaves))
			set_and_calc_slave_port_state(dev, i, port,
						      event, &gen_event);
}
/**************************************************************************
	The function get as input the new event to that port,
	and according to the prev state change the slave's port state.
	The events are:
		MLX4_PORT_STATE_DEV_EVENT_PORT_DOWN,
		MLX4_PORT_STATE_DEV_EVENT_PORT_UP
		MLX4_PORT_STATE_IB_EVENT_GID_VALID
		MLX4_PORT_STATE_IB_EVENT_GID_INVALID
***************************************************************************/
int set_and_calc_slave_port_state(struct mlx4_dev *dev, int slave,
				  u8 port, int event,
				  enum slave_port_gen_event *gen_event)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_slave_state *ctx = NULL;
	unsigned long flags;
	int ret = -1;
	struct mlx4_active_ports actv_ports = mlx4_get_active_ports(dev, slave);
	enum slave_port_state cur_state =
		mlx4_get_slave_port_state(dev, slave, port);

	*gen_event = SLAVE_PORT_GEN_EVENT_NONE;

	if (slave >= dev->num_slaves || port > dev->caps.num_ports ||
	    port <= 0 || !test_bit(port - 1, actv_ports.ports)) {
		pr_err("%s: Error: asking for slave:%d, port:%d\n",
		       __func__, slave, port);
		return ret;
	}

	ctx = &priv->mfunc.master.slave_state[slave];
	spin_lock_irqsave(&ctx->lock, flags);

	switch (cur_state) {
	case SLAVE_PORT_DOWN:
		if (MLX4_PORT_STATE_DEV_EVENT_PORT_UP == event)
			mlx4_set_slave_port_state(dev, slave, port,
						  SLAVE_PENDING_UP);
		break;
	case SLAVE_PENDING_UP:
		if (MLX4_PORT_STATE_DEV_EVENT_PORT_DOWN == event)
			mlx4_set_slave_port_state(dev, slave, port,
						  SLAVE_PORT_DOWN);
		else if (MLX4_PORT_STATE_IB_PORT_STATE_EVENT_GID_VALID == event) {
			mlx4_set_slave_port_state(dev, slave, port,
						  SLAVE_PORT_UP);
			*gen_event = SLAVE_PORT_GEN_EVENT_UP;
		}
		break;
	case SLAVE_PORT_UP:
		if (MLX4_PORT_STATE_DEV_EVENT_PORT_DOWN == event) {
			mlx4_set_slave_port_state(dev, slave, port,
						  SLAVE_PORT_DOWN);
			*gen_event = SLAVE_PORT_GEN_EVENT_DOWN;
		} else if (MLX4_PORT_STATE_IB_EVENT_GID_INVALID ==
				event) {
			mlx4_set_slave_port_state(dev, slave, port,
						  SLAVE_PENDING_UP);
			*gen_event = SLAVE_PORT_GEN_EVENT_DOWN;
		}
		break;
	default:
		pr_err("%s: BUG!!! UNKNOWN state: slave:%d, port:%d\n",
		       __func__, slave, port);
		goto out;
	}
	ret = mlx4_get_slave_port_state(dev, slave, port);

out:
	spin_unlock_irqrestore(&ctx->lock, flags);
	return ret;
}

EXPORT_SYMBOL(set_and_calc_slave_port_state);

int mlx4_gen_slaves_port_mgt_ev(struct mlx4_dev *dev, u8 port, int attr)
{
	struct mlx4_eqe eqe;

	memset(&eqe, 0, sizeof(eqe));

	eqe.type = MLX4_EVENT_TYPE_PORT_MNG_CHG_EVENT;
	eqe.subtype = MLX4_DEV_PMC_SUBTYPE_PORT_INFO;
	eqe.event.port_mgmt_change.port = port;
	eqe.event.port_mgmt_change.params.port_info.changed_attr =
		cpu_to_be32((u32) attr);

	slave_event(dev, ALL_SLAVES, &eqe);
	return 0;
}
EXPORT_SYMBOL(mlx4_gen_slaves_port_mgt_ev);

void mlx4_master_handle_slave_flr(struct work_struct *work)
{
	struct mlx4_mfunc_master_ctx *master =
		container_of(work, struct mlx4_mfunc_master_ctx,
			     slave_flr_event_work);
	struct mlx4_mfunc *mfunc =
		container_of(master, struct mlx4_mfunc, master);
	struct mlx4_priv *priv =
		container_of(mfunc, struct mlx4_priv, mfunc);
	struct mlx4_dev *dev = &priv->dev;
	struct mlx4_slave_state *slave_state = priv->mfunc.master.slave_state;
	int i;
	int err;
	unsigned long flags;

	mlx4_dbg(dev, "mlx4_handle_slave_flr\n");

	for (i = 0 ; i < dev->num_slaves; i++) {

		if (MLX4_COMM_CMD_FLR == slave_state[i].last_cmd) {
			mlx4_dbg(dev, "mlx4_handle_slave_flr: clean slave: %d\n",
				 i);
			/* In case of 'Reset flow' FLR can be generated for
			 * a slave before mlx4_load_one is done.
			 * make sure interface is up before trying to delete
			 * slave resources which weren't allocated yet.
			 */
			if (dev->persist->interface_state &
			    MLX4_INTERFACE_STATE_UP)
				mlx4_delete_all_resources_for_slave(dev, i);
			/*return the slave to running mode*/
			spin_lock_irqsave(&priv->mfunc.master.slave_state_lock, flags);
			slave_state[i].last_cmd = MLX4_COMM_CMD_RESET;
			slave_state[i].is_slave_going_down = 0;
			spin_unlock_irqrestore(&priv->mfunc.master.slave_state_lock, flags);
			/*notify the FW:*/
			err = mlx4_cmd(dev, 0, i, 0, MLX4_CMD_INFORM_FLR_DONE,
				       MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
			if (err)
				mlx4_warn(dev, "Failed to notify FW on FLR done (slave:%d)\n",
					  i);
		}
	}
}

static int mlx4_eq_int(struct mlx4_dev *dev, struct mlx4_eq *eq)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_eqe *eqe;
	int cqn;
	int eqes_found = 0;
	int set_ci = 0;
	int port;
	int slave = 0;
	int ret;
	int flr_slave;
	u8 update_slave_state;
	int i;
	enum slave_port_gen_event gen_event;
	unsigned long flags;
	struct mlx4_vport_state *s_info;
	int eqe_size = dev->caps.eqe_size;

	while ((eqe = next_eqe_sw(eq, dev->caps.eqe_factor, eqe_size))) {
		/*
		 * Make sure we read EQ entry contents after we've
		 * checked the ownership bit.
		 */
		dma_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_dbg(dev, "event %d arrived\n", eqe->type);
			if (mlx4_is_master(dev)) {
				/* forward only to slave owning the QP */
				ret = mlx4_get_slave_from_resource_id(dev,
						RES_QP,
						be32_to_cpu(eqe->event.qp.qpn)
						& 0xffffff, &slave);
				if (ret && ret != -ENOENT) {
					mlx4_dbg(dev, "QP event %02x(%02x) on EQ %d at index %u: could not get slave id (%d)\n",
						 eqe->type, eqe->subtype,
						 eq->eqn, eq->cons_index, ret);
					break;
				}

				if (!ret && slave != dev->caps.function) {
					mlx4_slave_event(dev, slave, eqe);
					break;
				}

			}
			mlx4_qp_event(dev, be32_to_cpu(eqe->event.qp.qpn) &
				      0xffffff, eqe->type);
			break;

		case MLX4_EVENT_TYPE_SRQ_LIMIT:
			mlx4_dbg(dev, "%s: MLX4_EVENT_TYPE_SRQ_LIMIT. srq_no=0x%x, eq 0x%x\n",
				 __func__, be32_to_cpu(eqe->event.srq.srqn),
				 eq->eqn);
			fallthrough;
		case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
			if (mlx4_is_master(dev)) {
				/* forward only to slave owning the SRQ */
				ret = mlx4_get_slave_from_resource_id(dev,
						RES_SRQ,
						be32_to_cpu(eqe->event.srq.srqn)
						& 0xffffff,
						&slave);
				if (ret && ret != -ENOENT) {
					mlx4_warn(dev, "SRQ event %02x(%02x) on EQ %d at index %u: could not get slave id (%d)\n",
						  eqe->type, eqe->subtype,
						  eq->eqn, eq->cons_index, ret);
					break;
				}
				if (eqe->type ==
				    MLX4_EVENT_TYPE_SRQ_CATAS_ERROR)
					mlx4_warn(dev, "%s: slave:%d, srq_no:0x%x, event: %02x(%02x)\n",
						  __func__, slave,
						  be32_to_cpu(eqe->event.srq.srqn),
						  eqe->type, eqe->subtype);

				if (!ret && slave != dev->caps.function) {
					if (eqe->type ==
					    MLX4_EVENT_TYPE_SRQ_CATAS_ERROR)
						mlx4_warn(dev, "%s: sending event %02x(%02x) to slave:%d\n",
							  __func__, eqe->type,
							  eqe->subtype, slave);
					mlx4_slave_event(dev, slave, eqe);
					break;
				}
			}
			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: {
			struct mlx4_slaves_pport slaves_port;
			port = be32_to_cpu(eqe->event.port_change.port) >> 28;
			slaves_port = mlx4_phys_to_slaves_pport(dev, port);
			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;
				if (!mlx4_is_master(dev))
					break;
				for (i = 0; i < dev->persist->num_vfs + 1;
				     i++) {
					int reported_port = mlx4_is_bonded(dev) ? 1 : mlx4_phys_to_slave_port(dev, i, port);

					if (!test_bit(i, slaves_port.slaves) && !mlx4_is_bonded(dev))
						continue;
					if (dev->caps.port_type[port] == MLX4_PORT_TYPE_ETH) {
						if (i == mlx4_master_func_num(dev))
							continue;
						mlx4_dbg(dev, "%s: Sending MLX4_PORT_CHANGE_SUBTYPE_DOWN to slave: %d, port:%d\n",
							 __func__, i, port);
						s_info = &priv->mfunc.master.vf_oper[i].vport[port].state;
						if (IFLA_VF_LINK_STATE_AUTO == s_info->link_state) {
							eqe->event.port_change.port =
								cpu_to_be32(
								(be32_to_cpu(eqe->event.port_change.port) & 0xFFFFFFF)
								| (reported_port << 28));
							mlx4_slave_event(dev, i, eqe);
						}
					} else {  /* IB port */
						set_and_calc_slave_port_state(dev, i, port,
									      MLX4_PORT_STATE_DEV_EVENT_PORT_DOWN,
									      &gen_event);
						/*we can be in pending state, then do not send port_down event*/
						if (SLAVE_PORT_GEN_EVENT_DOWN ==  gen_event) {
							if (i == mlx4_master_func_num(dev))
								continue;
							eqe->event.port_change.port =
								cpu_to_be32(
								(be32_to_cpu(eqe->event.port_change.port) & 0xFFFFFFF)
								| (mlx4_phys_to_slave_port(dev, i, port) << 28));
							mlx4_slave_event(dev, i, eqe);
						}
					}
				}
			} else {
				mlx4_dispatch_event(dev, MLX4_DEV_EVENT_PORT_UP,
						    &port);

				mlx4_priv(dev)->sense.do_sense_port[port] = 0;

				if (!mlx4_is_master(dev))
					break;
				if (dev->caps.port_type[port] == MLX4_PORT_TYPE_ETH)
					for (i = 0;
					     i < dev->persist->num_vfs + 1;
					     i++) {
						int reported_port = mlx4_is_bonded(dev) ? 1 : mlx4_phys_to_slave_port(dev, i, port);

						if (!test_bit(i, slaves_port.slaves) && !mlx4_is_bonded(dev))
							continue;
						if (i == mlx4_master_func_num(dev))
							continue;
						s_info = &priv->mfunc.master.vf_oper[i].vport[port].state;
						if (IFLA_VF_LINK_STATE_AUTO == s_info->link_state) {
							eqe->event.port_change.port =
								cpu_to_be32(
								(be32_to_cpu(eqe->event.port_change.port) & 0xFFFFFFF)
								| (reported_port << 28));
							mlx4_slave_event(dev, i, eqe);
						}
					}
				else /* IB port */
					/* port-up event will be sent to a slave when the
					 * slave's alias-guid is set. This is done in alias_GUID.c
					 */
					set_all_slave_state(dev, port, MLX4_DEV_EVENT_PORT_UP);
			}
			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);
			if (mlx4_is_master(dev)) {
				ret = mlx4_get_slave_from_resource_id(dev,
					RES_CQ,
					be32_to_cpu(eqe->event.cq_err.cqn)
					& 0xffffff, &slave);
				if (ret && ret != -ENOENT) {
					mlx4_dbg(dev, "CQ event %02x(%02x) on EQ %d at index %u: could not get slave id (%d)\n",
						 eqe->type, eqe->subtype,
						 eq->eqn, eq->cons_index, ret);
					break;
				}

				if (!ret && slave != dev->caps.function) {
					mlx4_slave_event(dev, slave, eqe);
					break;
				}
			}
			mlx4_cq_event(dev,
				      be32_to_cpu(eqe->event.cq_err.cqn)
				      & 0xffffff,
				      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_OP_REQUIRED:
			atomic_inc(&priv->opreq_count);
			/* FW commands can't be executed from interrupt context
			 * working in deferred task
			 */
			queue_work(mlx4_wq, &priv->opreq_task);
			break;

		case MLX4_EVENT_TYPE_COMM_CHANNEL:
			if (!mlx4_is_master(dev)) {
				mlx4_warn(dev, "Received comm channel event for non master device\n");
				break;
			}
			memcpy(&priv->mfunc.master.comm_arm_bit_vector,
			       eqe->event.comm_channel_arm.bit_vec,
			       sizeof(eqe->event.comm_channel_arm.bit_vec));
			queue_work(priv->mfunc.master.comm_wq,
				   &priv->mfunc.master.comm_work);
			break;

		case MLX4_EVENT_TYPE_FLR_EVENT:
			flr_slave = be32_to_cpu(eqe->event.flr_event.slave_id);
			if (!mlx4_is_master(dev)) {
				mlx4_warn(dev, "Non-master function received FLR event\n");
				break;
			}

			mlx4_dbg(dev, "FLR event for slave: %d\n", flr_slave);

			if (flr_slave >= dev->num_slaves) {
				mlx4_warn(dev,
					  "Got FLR for unknown function: %d\n",
					  flr_slave);
				update_slave_state = 0;
			} else
				update_slave_state = 1;

			spin_lock_irqsave(&priv->mfunc.master.slave_state_lock, flags);
			if (update_slave_state) {
				priv->mfunc.master.slave_state[flr_slave].active = false;
				priv->mfunc.master.slave_state[flr_slave].last_cmd = MLX4_COMM_CMD_FLR;
				priv->mfunc.master.slave_state[flr_slave].is_slave_going_down = 1;
			}
			spin_unlock_irqrestore(&priv->mfunc.master.slave_state_lock, flags);
			mlx4_dispatch_event(dev, MLX4_DEV_EVENT_SLAVE_SHUTDOWN,
					    &flr_slave);
			queue_work(priv->mfunc.master.comm_wq,
				   &priv->mfunc.master.slave_flr_event_work);
			break;

		case MLX4_EVENT_TYPE_FATAL_WARNING:
			if (eqe->subtype == MLX4_FATAL_WARNING_SUBTYPE_WARMING) {
				if (mlx4_is_master(dev))
					for (i = 0; i < dev->num_slaves; i++) {
						mlx4_dbg(dev, "%s: Sending MLX4_FATAL_WARNING_SUBTYPE_WARMING to slave: %d\n",
							 __func__, i);
						if (i == dev->caps.function)
							continue;
						mlx4_slave_event(dev, i, eqe);
					}
				mlx4_err(dev, "Temperature Threshold was reached! Threshold: %d celsius degrees; Current Temperature: %d\n",
					 be16_to_cpu(eqe->event.warming.warning_threshold),
					 be16_to_cpu(eqe->event.warming.current_temperature));
			} else
				mlx4_warn(dev, "Unhandled event FATAL WARNING (%02x), subtype %02x on EQ %d at index %u. owner=%x, nent=0x%x, slave=%x, ownership=%s\n",
					  eqe->type, eqe->subtype, eq->eqn,
					  eq->cons_index, eqe->owner, eq->nent,
					  eqe->slave_id,
					  !!(eqe->owner & 0x80) ^
					  !!(eq->cons_index & eq->nent) ? "HW" : "SW");

			break;

		case MLX4_EVENT_TYPE_PORT_MNG_CHG_EVENT:
			mlx4_dispatch_event(
				dev, MLX4_DEV_EVENT_PORT_MGMT_CHANGE, eqe);
			break;

		case MLX4_EVENT_TYPE_RECOVERABLE_ERROR_EVENT:
			switch (eqe->subtype) {
			case MLX4_RECOVERABLE_ERROR_EVENT_SUBTYPE_BAD_CABLE:
				mlx4_warn(dev, "Bad cable detected on port %u\n",
					  eqe->event.bad_cable.port);
				break;
			case MLX4_RECOVERABLE_ERROR_EVENT_SUBTYPE_UNSUPPORTED_CABLE:
				mlx4_warn(dev, "Unsupported cable detected\n");
				break;
			default:
				mlx4_dbg(dev,
					 "Unhandled recoverable error event detected: %02x(%02x) on EQ %d at index %u. owner=%x, nent=0x%x, ownership=%s\n",
					 eqe->type, eqe->subtype, eq->eqn,
					 eq->cons_index, eqe->owner, eq->nent,
					 !!(eqe->owner & 0x80) ^
					 !!(eq->cons_index & eq->nent) ? "HW" : "SW");
				break;
			}
			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. owner=%x, nent=0x%x, slave=%x, ownership=%s\n",
				  eqe->type, eqe->subtype, eq->eqn,
				  eq->cons_index, eqe->owner, eq->nent,
				  eqe->slave_id,
				  !!(eqe->owner & 0x80) ^
				  !!(eq->cons_index & eq->nent) ? "HW" : "SW");
			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;
}

int mlx4_MAP_EQ_wrapper(struct mlx4_dev *dev, int slave,
			struct mlx4_vhcr *vhcr,
			struct mlx4_cmd_mailbox *inbox,
			struct mlx4_cmd_mailbox *outbox,
			struct mlx4_cmd_info *cmd)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_slave_event_eq_info *event_eq =
		priv->mfunc.master.slave_state[slave].event_eq;
	u32 in_modifier = vhcr->in_modifier;
	u32 eqn = in_modifier & 0x3FF;
	u64 in_param =  vhcr->in_param;
	int err = 0;
	int i;

	if (slave == dev->caps.function)
		err = mlx4_cmd(dev, in_param, (in_modifier & 0x80000000) | eqn,
			       0, MLX4_CMD_MAP_EQ, MLX4_CMD_TIME_CLASS_B,
			       MLX4_CMD_NATIVE);
	if (!err)
		for (i = 0; i < MLX4_EVENT_TYPES_NUM; ++i)
			if (in_param & (1LL << i))
				event_eq[i].eqn = in_modifier >> 31 ? -1 : eqn;

	return err;
}

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,
			MLX4_CMD_WRAPPED);
}

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,
			MLX4_CMD_WRAPPED);
}

static int mlx4_HW2SW_EQ(struct mlx4_dev *dev,  int eq_num)
{
	return mlx4_cmd(dev, 0, eq_num, 1, MLX4_CMD_HW2SW_EQ,
			MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
}

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) / 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->persist->pdev, 2) +
				((eq->eqn / 4) << (dev->uar_page_shift)),
				(1 << (dev->uar_page_shift)));
		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 void mlx4_unmap_uar(struct mlx4_dev *dev)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	int i;

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

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));
	/* CX3 is capable of extending the CQE/EQE from 32 to 64 bytes, with
	 * strides of 64B,128B and 256B.
	 */
	npages = PAGE_ALIGN(eq->nent * dev->caps.eqe_size) / PAGE_SIZE;

	eq->page_list = kmalloc_array(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_array(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->persist->
							  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;
	}

	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;

	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;

	INIT_LIST_HEAD(&eq->tasklet_ctx.list);
	INIT_LIST_HEAD(&eq->tasklet_ctx.process_list);
	spin_lock_init(&eq->tasklet_ctx.lock);
	tasklet_setup(&eq->tasklet_ctx.task, mlx4_cq_tasklet_cb);

	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, MLX4_USE_RR);

err_out_free_pages:
	for (i = 0; i < npages; ++i)
		if (eq->page_list[i].buf)
			dma_free_coherent(&dev->persist->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);
	int err;
	int i;
	/* CX3 is capable of extending the CQE/EQE from 32 to 64 bytes, with
	 * strides of 64B,128B and 256B
	 */
	int npages = PAGE_ALIGN(dev->caps.eqe_size  * eq->nent) / PAGE_SIZE;

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

	synchronize_irq(eq->irq);
	tasklet_disable(&eq->tasklet_ctx.task);

	mlx4_mtt_cleanup(dev, &eq->mtt);
	for (i = 0; i < npages; ++i)
		dma_free_coherent(&dev->persist->pdev->dev, 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_USE_RR);
}

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

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

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

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

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

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

	if (!mlx4_is_slave(dev)) {
		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_array(MLX4_IRQNAME_SIZE,
			      (dev->caps.num_comp_vectors + 1),
			      GFP_KERNEL);
	if (!priv->eq_table.irq_names) {
		err = -ENOMEM;
		goto err_out_clr_int;
	}

	for (i = 0; i < dev->caps.num_comp_vectors + 1; ++i) {
		if (i == MLX4_EQ_ASYNC) {
			err = mlx4_create_eq(dev,
					     MLX4_NUM_ASYNC_EQE + MLX4_NUM_SPARE_EQE,
					     0, &priv->eq_table.eq[MLX4_EQ_ASYNC]);
		} else {
			struct mlx4_eq	*eq = &priv->eq_table.eq[i];
#ifdef CONFIG_RFS_ACCEL
			int port = find_first_bit(eq->actv_ports.ports,
						  dev->caps.num_ports) + 1;

			if (port <= dev->caps.num_ports) {
				struct mlx4_port_info *info =
					&mlx4_priv(dev)->port[port];

				if (!info->rmap) {
					info->rmap = alloc_irq_cpu_rmap(
						mlx4_get_eqs_per_port(dev, port));
					if (!info->rmap) {
						mlx4_warn(dev, "Failed to allocate cpu rmap\n");
						err = -ENOMEM;
						goto err_out_unmap;
					}
				}

				err = irq_cpu_rmap_add(
					info->rmap, eq->irq);
				if (err)
					mlx4_warn(dev, "Failed adding irq rmap\n");
			}
#endif
			err = mlx4_create_eq(dev, dev->quotas.cq +
					     MLX4_NUM_SPARE_EQE,
					     (dev->flags & MLX4_FLAG_MSI_X) ?
					     i + 1 - !!(i > MLX4_EQ_ASYNC) : 0,
					     eq);
		}
		if (err)
			goto err_out_unmap;
	}

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

		snprintf(priv->eq_table.irq_names +
			 MLX4_EQ_ASYNC * MLX4_IRQNAME_SIZE,
			 MLX4_IRQNAME_SIZE,
			 "mlx4-async@pci:%s",
			 pci_name(dev->persist->pdev));
		eq_name = priv->eq_table.irq_names +
			MLX4_EQ_ASYNC * MLX4_IRQNAME_SIZE;

		err = request_irq(priv->eq_table.eq[MLX4_EQ_ASYNC].irq,
				  mlx4_msi_x_interrupt, 0, eq_name,
				  priv->eq_table.eq + MLX4_EQ_ASYNC);
		if (err)
			goto err_out_unmap;

		priv->eq_table.eq[MLX4_EQ_ASYNC].have_irq = 1;
	} else {
		snprintf(priv->eq_table.irq_names,
			 MLX4_IRQNAME_SIZE,
			 DRV_NAME "@pci:%s",
			 pci_name(dev->persist->pdev));
		err = request_irq(dev->persist->pdev->irq, mlx4_interrupt,
				  IRQF_SHARED, priv->eq_table.irq_names, dev);
		if (err)
			goto err_out_unmap;

		priv->eq_table.have_irq = 1;
	}

	err = mlx4_MAP_EQ(dev, get_async_ev_mask(dev), 0,
			  priv->eq_table.eq[MLX4_EQ_ASYNC].eqn);
	if (err)
		mlx4_warn(dev, "MAP_EQ for async EQ %d failed (%d)\n",
			   priv->eq_table.eq[MLX4_EQ_ASYNC].eqn, err);

	/* arm ASYNC eq */
	eq_set_ci(&priv->eq_table.eq[MLX4_EQ_ASYNC], 1);

	return 0;

err_out_unmap:
	while (i > 0)
		mlx4_free_eq(dev, &priv->eq_table.eq[--i]);
#ifdef CONFIG_RFS_ACCEL
	for (i = 1; i <= dev->caps.num_ports; i++) {
		if (mlx4_priv(dev)->port[i].rmap) {
			free_irq_cpu_rmap(mlx4_priv(dev)->port[i].rmap);
			mlx4_priv(dev)->port[i].rmap = NULL;
		}
	}
#endif
	mlx4_free_irqs(dev);

err_out_clr_int:
	if (!mlx4_is_slave(dev))
		mlx4_unmap_clr_int(dev);

err_out_bitmap:
	mlx4_unmap_uar(dev);
	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, get_async_ev_mask(dev), 1,
		    priv->eq_table.eq[MLX4_EQ_ASYNC].eqn);

#ifdef CONFIG_RFS_ACCEL
	for (i = 1; i <= dev->caps.num_ports; i++) {
		if (mlx4_priv(dev)->port[i].rmap) {
			free_irq_cpu_rmap(mlx4_priv(dev)->port[i].rmap);
			mlx4_priv(dev)->port[i].rmap = NULL;
		}
	}
#endif
	mlx4_free_irqs(dev);

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

	if (!mlx4_is_slave(dev))
		mlx4_unmap_clr_int(dev);

	mlx4_unmap_uar(dev);
	mlx4_bitmap_cleanup(&priv->eq_table.bitmap);

	kfree(priv->eq_table.uar_map);
}

/* A test that verifies that we can accept interrupts
 * on the vector allocated for asynchronous events
 */
int mlx4_test_async(struct mlx4_dev *dev)
{
	return mlx4_NOP(dev);
}
EXPORT_SYMBOL(mlx4_test_async);

/* A test that verifies that we can accept interrupts
 * on the given irq vector of the tested port.
 * Interrupts are checked using the NOP command.
 */
int mlx4_test_interrupt(struct mlx4_dev *dev, int vector)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	int err;

	/* Temporary use polling for command completions */
	mlx4_cmd_use_polling(dev);

	/* Map the new eq to handle all asynchronous events */
	err = mlx4_MAP_EQ(dev, get_async_ev_mask(dev), 0,
			  priv->eq_table.eq[MLX4_CQ_TO_EQ_VECTOR(vector)].eqn);
	if (err) {
		mlx4_warn(dev, "Failed mapping eq for interrupt test\n");
		goto out;
	}

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

	/* Return to default */
	mlx4_cmd_use_polling(dev);
out:
	mlx4_MAP_EQ(dev, get_async_ev_mask(dev), 0,
		    priv->eq_table.eq[MLX4_EQ_ASYNC].eqn);
	mlx4_cmd_use_events(dev);

	return err;
}
EXPORT_SYMBOL(mlx4_test_interrupt);

bool mlx4_is_eq_vector_valid(struct mlx4_dev *dev, u8 port, int vector)
{
	struct mlx4_priv *priv = mlx4_priv(dev);

	vector = MLX4_CQ_TO_EQ_VECTOR(vector);
	if (vector < 0 || (vector >= dev->caps.num_comp_vectors + 1) ||
	    (vector == MLX4_EQ_ASYNC))
		return false;

	return test_bit(port - 1, priv->eq_table.eq[vector].actv_ports.ports);
}
EXPORT_SYMBOL(mlx4_is_eq_vector_valid);

u32 mlx4_get_eqs_per_port(struct mlx4_dev *dev, u8 port)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	unsigned int i;
	unsigned int sum = 0;

	for (i = 0; i < dev->caps.num_comp_vectors + 1; i++)
		sum += !!test_bit(port - 1,
				  priv->eq_table.eq[i].actv_ports.ports);

	return sum;
}
EXPORT_SYMBOL(mlx4_get_eqs_per_port);

int mlx4_is_eq_shared(struct mlx4_dev *dev, int vector)
{
	struct mlx4_priv *priv = mlx4_priv(dev);

	vector = MLX4_CQ_TO_EQ_VECTOR(vector);
	if (vector <= 0 || (vector >= dev->caps.num_comp_vectors + 1))
		return -EINVAL;

	return !!(bitmap_weight(priv->eq_table.eq[vector].actv_ports.ports,
				dev->caps.num_ports) > 1);
}
EXPORT_SYMBOL(mlx4_is_eq_shared);

struct cpu_rmap *mlx4_get_cpu_rmap(struct mlx4_dev *dev, int port)
{
	return mlx4_priv(dev)->port[port].rmap;
}
EXPORT_SYMBOL(mlx4_get_cpu_rmap);

int mlx4_assign_eq(struct mlx4_dev *dev, u8 port, int *vector)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	int err = 0, i = 0;
	u32 min_ref_count_val = (u32)-1;
	int requested_vector = MLX4_CQ_TO_EQ_VECTOR(*vector);
	int *prequested_vector = NULL;


	mutex_lock(&priv->msix_ctl.pool_lock);
	if (requested_vector < (dev->caps.num_comp_vectors + 1) &&
	    (requested_vector >= 0) &&
	    (requested_vector != MLX4_EQ_ASYNC)) {
		if (test_bit(port - 1,
			     priv->eq_table.eq[requested_vector].actv_ports.ports)) {
			prequested_vector = &requested_vector;
		} else {
			struct mlx4_eq *eq;

			for (i = 1; i < port;
			     requested_vector += mlx4_get_eqs_per_port(dev, i++))
				;

			eq = &priv->eq_table.eq[requested_vector];
			if (requested_vector < dev->caps.num_comp_vectors + 1 &&
			    test_bit(port - 1, eq->actv_ports.ports)) {
				prequested_vector = &requested_vector;
			}
		}
	}

	if  (!prequested_vector) {
		requested_vector = -1;
		for (i = 0; min_ref_count_val && i < dev->caps.num_comp_vectors + 1;
		     i++) {
			struct mlx4_eq *eq = &priv->eq_table.eq[i];

			if (min_ref_count_val > eq->ref_count &&
			    test_bit(port - 1, eq->actv_ports.ports)) {
				min_ref_count_val = eq->ref_count;
				requested_vector = i;
			}
		}

		if (requested_vector < 0) {
			err = -ENOSPC;
			goto err_unlock;
		}

		prequested_vector = &requested_vector;
	}

	if (!test_bit(*prequested_vector, priv->msix_ctl.pool_bm) &&
	    dev->flags & MLX4_FLAG_MSI_X) {
		set_bit(*prequested_vector, priv->msix_ctl.pool_bm);
		snprintf(priv->eq_table.irq_names +
			 *prequested_vector * MLX4_IRQNAME_SIZE,
			 MLX4_IRQNAME_SIZE, "mlx4-%d@%s",
			 *prequested_vector, dev_name(&dev->persist->pdev->dev));

		err = request_irq(priv->eq_table.eq[*prequested_vector].irq,
				  mlx4_msi_x_interrupt, 0,
				  &priv->eq_table.irq_names[*prequested_vector << 5],
				  priv->eq_table.eq + *prequested_vector);

		if (err) {
			clear_bit(*prequested_vector, priv->msix_ctl.pool_bm);
			*prequested_vector = -1;
		} else {
#if defined(CONFIG_SMP)
			mlx4_set_eq_affinity_hint(priv, *prequested_vector);
#endif
			eq_set_ci(&priv->eq_table.eq[*prequested_vector], 1);
			priv->eq_table.eq[*prequested_vector].have_irq = 1;
		}
	}

	if (!err && *prequested_vector >= 0)
		priv->eq_table.eq[*prequested_vector].ref_count++;

err_unlock:
	mutex_unlock(&priv->msix_ctl.pool_lock);

	if (!err && *prequested_vector >= 0)
		*vector = MLX4_EQ_TO_CQ_VECTOR(*prequested_vector);
	else
		*vector = 0;

	return err;
}
EXPORT_SYMBOL(mlx4_assign_eq);

int mlx4_eq_get_irq(struct mlx4_dev *dev, int cq_vec)
{
	struct mlx4_priv *priv = mlx4_priv(dev);

	return priv->eq_table.eq[MLX4_CQ_TO_EQ_VECTOR(cq_vec)].irq;
}
EXPORT_SYMBOL(mlx4_eq_get_irq);

void mlx4_release_eq(struct mlx4_dev *dev, int vec)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	int eq_vec = MLX4_CQ_TO_EQ_VECTOR(vec);

	mutex_lock(&priv->msix_ctl.pool_lock);
	priv->eq_table.eq[eq_vec].ref_count--;

	/* once we allocated EQ, we don't release it because it might be binded
	 * to cpu_rmap.
	 */
	mutex_unlock(&priv->msix_ctl.pool_lock);
}
EXPORT_SYMBOL(mlx4_release_eq);