/*
 * Copyright (c) 2013-2016, 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/highmem.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/random.h>
#include <linux/mlx5/driver.h>
#include <linux/mlx5/eq.h>
#include <linux/debugfs.h>

#include "mlx5_core.h"
#include "lib/eq.h"
#include "lib/tout.h"
#define CREATE_TRACE_POINTS
#include "diag/cmd_tracepoint.h"

struct mlx5_ifc_mbox_out_bits {
	u8         status[0x8];
	u8         reserved_at_8[0x18];

	u8         syndrome[0x20];

	u8         reserved_at_40[0x40];
};

struct mlx5_ifc_mbox_in_bits {
	u8         opcode[0x10];
	u8         uid[0x10];

	u8         reserved_at_20[0x10];
	u8         op_mod[0x10];

	u8         reserved_at_40[0x40];
};

enum {
	CMD_IF_REV = 5,
};

enum {
	CMD_MODE_POLLING,
	CMD_MODE_EVENTS
};

enum {
	MLX5_CMD_DELIVERY_STAT_OK			= 0x0,
	MLX5_CMD_DELIVERY_STAT_SIGNAT_ERR		= 0x1,
	MLX5_CMD_DELIVERY_STAT_TOK_ERR			= 0x2,
	MLX5_CMD_DELIVERY_STAT_BAD_BLK_NUM_ERR		= 0x3,
	MLX5_CMD_DELIVERY_STAT_OUT_PTR_ALIGN_ERR	= 0x4,
	MLX5_CMD_DELIVERY_STAT_IN_PTR_ALIGN_ERR		= 0x5,
	MLX5_CMD_DELIVERY_STAT_FW_ERR			= 0x6,
	MLX5_CMD_DELIVERY_STAT_IN_LENGTH_ERR		= 0x7,
	MLX5_CMD_DELIVERY_STAT_OUT_LENGTH_ERR		= 0x8,
	MLX5_CMD_DELIVERY_STAT_RES_FLD_NOT_CLR_ERR	= 0x9,
	MLX5_CMD_DELIVERY_STAT_CMD_DESCR_ERR		= 0x10,
};

static u16 in_to_opcode(void *in)
{
	return MLX5_GET(mbox_in, in, opcode);
}

/* Returns true for opcodes that might be triggered very frequently and throttle
 * the command interface. Limit their command slots usage.
 */
static bool mlx5_cmd_is_throttle_opcode(u16 op)
{
	switch (op) {
	case MLX5_CMD_OP_CREATE_GENERAL_OBJECT:
	case MLX5_CMD_OP_DESTROY_GENERAL_OBJECT:
	case MLX5_CMD_OP_MODIFY_GENERAL_OBJECT:
	case MLX5_CMD_OP_QUERY_GENERAL_OBJECT:
	case MLX5_CMD_OP_SYNC_CRYPTO:
		return true;
	}
	return false;
}

static struct mlx5_cmd_work_ent *
cmd_alloc_ent(struct mlx5_cmd *cmd, struct mlx5_cmd_msg *in,
	      struct mlx5_cmd_msg *out, void *uout, int uout_size,
	      mlx5_cmd_cbk_t cbk, void *context, int page_queue)
{
	gfp_t alloc_flags = cbk ? GFP_ATOMIC : GFP_KERNEL;
	struct mlx5_cmd_work_ent *ent;

	ent = kzalloc(sizeof(*ent), alloc_flags);
	if (!ent)
		return ERR_PTR(-ENOMEM);

	ent->idx	= -EINVAL;
	ent->in		= in;
	ent->out	= out;
	ent->uout	= uout;
	ent->uout_size	= uout_size;
	ent->callback	= cbk;
	ent->context	= context;
	ent->cmd	= cmd;
	ent->page_queue = page_queue;
	ent->op         = in_to_opcode(in->first.data);
	refcount_set(&ent->refcnt, 1);

	return ent;
}

static void cmd_free_ent(struct mlx5_cmd_work_ent *ent)
{
	kfree(ent);
}

static u8 alloc_token(struct mlx5_cmd *cmd)
{
	u8 token;

	spin_lock(&cmd->token_lock);
	cmd->token++;
	if (cmd->token == 0)
		cmd->token++;
	token = cmd->token;
	spin_unlock(&cmd->token_lock);

	return token;
}

static int cmd_alloc_index(struct mlx5_cmd *cmd, struct mlx5_cmd_work_ent *ent)
{
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&cmd->alloc_lock, flags);
	ret = find_first_bit(&cmd->vars.bitmask, cmd->vars.max_reg_cmds);
	if (ret < cmd->vars.max_reg_cmds) {
		clear_bit(ret, &cmd->vars.bitmask);
		ent->idx = ret;
		cmd->ent_arr[ent->idx] = ent;
	}
	spin_unlock_irqrestore(&cmd->alloc_lock, flags);

	return ret < cmd->vars.max_reg_cmds ? ret : -ENOMEM;
}

static void cmd_free_index(struct mlx5_cmd *cmd, int idx)
{
	lockdep_assert_held(&cmd->alloc_lock);
	set_bit(idx, &cmd->vars.bitmask);
}

static void cmd_ent_get(struct mlx5_cmd_work_ent *ent)
{
	refcount_inc(&ent->refcnt);
}

static void cmd_ent_put(struct mlx5_cmd_work_ent *ent)
{
	struct mlx5_cmd *cmd = ent->cmd;
	unsigned long flags;

	spin_lock_irqsave(&cmd->alloc_lock, flags);
	if (!refcount_dec_and_test(&ent->refcnt))
		goto out;

	if (ent->idx >= 0) {
		cmd_free_index(cmd, ent->idx);
		up(ent->page_queue ? &cmd->vars.pages_sem : &cmd->vars.sem);
	}

	cmd_free_ent(ent);
out:
	spin_unlock_irqrestore(&cmd->alloc_lock, flags);
}

static struct mlx5_cmd_layout *get_inst(struct mlx5_cmd *cmd, int idx)
{
	return cmd->cmd_buf + (idx << cmd->vars.log_stride);
}

static int mlx5_calc_cmd_blocks(struct mlx5_cmd_msg *msg)
{
	int size = msg->len;
	int blen = size - min_t(int, sizeof(msg->first.data), size);

	return DIV_ROUND_UP(blen, MLX5_CMD_DATA_BLOCK_SIZE);
}

static u8 xor8_buf(void *buf, size_t offset, int len)
{
	u8 *ptr = buf;
	u8 sum = 0;
	int i;
	int end = len + offset;

	for (i = offset; i < end; i++)
		sum ^= ptr[i];

	return sum;
}

static int verify_block_sig(struct mlx5_cmd_prot_block *block)
{
	size_t rsvd0_off = offsetof(struct mlx5_cmd_prot_block, rsvd0);
	int xor_len = sizeof(*block) - sizeof(block->data) - 1;

	if (xor8_buf(block, rsvd0_off, xor_len) != 0xff)
		return -EHWPOISON;

	if (xor8_buf(block, 0, sizeof(*block)) != 0xff)
		return -EHWPOISON;

	return 0;
}

static void calc_block_sig(struct mlx5_cmd_prot_block *block)
{
	int ctrl_xor_len = sizeof(*block) - sizeof(block->data) - 2;
	size_t rsvd0_off = offsetof(struct mlx5_cmd_prot_block, rsvd0);

	block->ctrl_sig = ~xor8_buf(block, rsvd0_off, ctrl_xor_len);
	block->sig = ~xor8_buf(block, 0, sizeof(*block) - 1);
}

static void calc_chain_sig(struct mlx5_cmd_msg *msg)
{
	struct mlx5_cmd_mailbox *next = msg->next;
	int n = mlx5_calc_cmd_blocks(msg);
	int i = 0;

	for (i = 0; i < n && next; i++)  {
		calc_block_sig(next->buf);
		next = next->next;
	}
}

static void set_signature(struct mlx5_cmd_work_ent *ent, int csum)
{
	ent->lay->sig = ~xor8_buf(ent->lay, 0,  sizeof(*ent->lay));
	if (csum) {
		calc_chain_sig(ent->in);
		calc_chain_sig(ent->out);
	}
}

static void poll_timeout(struct mlx5_cmd_work_ent *ent)
{
	struct mlx5_core_dev *dev = container_of(ent->cmd, struct mlx5_core_dev, cmd);
	u64 cmd_to_ms = mlx5_tout_ms(dev, CMD);
	unsigned long poll_end;
	u8 own;

	poll_end = jiffies + msecs_to_jiffies(cmd_to_ms + 1000);

	do {
		own = READ_ONCE(ent->lay->status_own);
		if (!(own & CMD_OWNER_HW)) {
			ent->ret = 0;
			return;
		}
		cond_resched();
	} while (time_before(jiffies, poll_end));

	ent->ret = -ETIMEDOUT;
}

static int verify_signature(struct mlx5_cmd_work_ent *ent)
{
	struct mlx5_cmd_mailbox *next = ent->out->next;
	int n = mlx5_calc_cmd_blocks(ent->out);
	int err;
	u8 sig;
	int i = 0;

	sig = xor8_buf(ent->lay, 0, sizeof(*ent->lay));
	if (sig != 0xff)
		return -EHWPOISON;

	for (i = 0; i < n && next; i++) {
		err = verify_block_sig(next->buf);
		if (err)
			return -EHWPOISON;

		next = next->next;
	}

	return 0;
}

static void dump_buf(void *buf, int size, int data_only, int offset, int idx)
{
	__be32 *p = buf;
	int i;

	for (i = 0; i < size; i += 16) {
		pr_debug("cmd[%d]: %03x: %08x %08x %08x %08x\n", idx, offset,
			 be32_to_cpu(p[0]), be32_to_cpu(p[1]),
			 be32_to_cpu(p[2]), be32_to_cpu(p[3]));
		p += 4;
		offset += 16;
	}
	if (!data_only)
		pr_debug("\n");
}

static int mlx5_internal_err_ret_value(struct mlx5_core_dev *dev, u16 op,
				       u32 *synd, u8 *status)
{
	*synd = 0;
	*status = 0;

	switch (op) {
	case MLX5_CMD_OP_TEARDOWN_HCA:
	case MLX5_CMD_OP_DISABLE_HCA:
	case MLX5_CMD_OP_MANAGE_PAGES:
	case MLX5_CMD_OP_DESTROY_MKEY:
	case MLX5_CMD_OP_DESTROY_EQ:
	case MLX5_CMD_OP_DESTROY_CQ:
	case MLX5_CMD_OP_DESTROY_QP:
	case MLX5_CMD_OP_DESTROY_PSV:
	case MLX5_CMD_OP_DESTROY_SRQ:
	case MLX5_CMD_OP_DESTROY_XRC_SRQ:
	case MLX5_CMD_OP_DESTROY_XRQ:
	case MLX5_CMD_OP_DESTROY_DCT:
	case MLX5_CMD_OP_DEALLOC_Q_COUNTER:
	case MLX5_CMD_OP_DESTROY_SCHEDULING_ELEMENT:
	case MLX5_CMD_OP_DESTROY_QOS_PARA_VPORT:
	case MLX5_CMD_OP_DEALLOC_PD:
	case MLX5_CMD_OP_DEALLOC_UAR:
	case MLX5_CMD_OP_DETACH_FROM_MCG:
	case MLX5_CMD_OP_DEALLOC_XRCD:
	case MLX5_CMD_OP_DEALLOC_TRANSPORT_DOMAIN:
	case MLX5_CMD_OP_DELETE_VXLAN_UDP_DPORT:
	case MLX5_CMD_OP_DELETE_L2_TABLE_ENTRY:
	case MLX5_CMD_OP_DESTROY_LAG:
	case MLX5_CMD_OP_DESTROY_VPORT_LAG:
	case MLX5_CMD_OP_DESTROY_TIR:
	case MLX5_CMD_OP_DESTROY_SQ:
	case MLX5_CMD_OP_DESTROY_RQ:
	case MLX5_CMD_OP_DESTROY_RMP:
	case MLX5_CMD_OP_DESTROY_TIS:
	case MLX5_CMD_OP_DESTROY_RQT:
	case MLX5_CMD_OP_DESTROY_FLOW_TABLE:
	case MLX5_CMD_OP_DESTROY_FLOW_GROUP:
	case MLX5_CMD_OP_DELETE_FLOW_TABLE_ENTRY:
	case MLX5_CMD_OP_DEALLOC_FLOW_COUNTER:
	case MLX5_CMD_OP_2ERR_QP:
	case MLX5_CMD_OP_2RST_QP:
	case MLX5_CMD_OP_MODIFY_NIC_VPORT_CONTEXT:
	case MLX5_CMD_OP_MODIFY_FLOW_TABLE:
	case MLX5_CMD_OP_SET_FLOW_TABLE_ENTRY:
	case MLX5_CMD_OP_SET_FLOW_TABLE_ROOT:
	case MLX5_CMD_OP_DEALLOC_PACKET_REFORMAT_CONTEXT:
	case MLX5_CMD_OP_DEALLOC_MODIFY_HEADER_CONTEXT:
	case MLX5_CMD_OP_FPGA_DESTROY_QP:
	case MLX5_CMD_OP_DESTROY_GENERAL_OBJECT:
	case MLX5_CMD_OP_DEALLOC_MEMIC:
	case MLX5_CMD_OP_PAGE_FAULT_RESUME:
	case MLX5_CMD_OP_QUERY_ESW_FUNCTIONS:
	case MLX5_CMD_OP_DEALLOC_SF:
	case MLX5_CMD_OP_DESTROY_UCTX:
	case MLX5_CMD_OP_DESTROY_UMEM:
	case MLX5_CMD_OP_MODIFY_RQT:
		return MLX5_CMD_STAT_OK;

	case MLX5_CMD_OP_QUERY_HCA_CAP:
	case MLX5_CMD_OP_QUERY_ADAPTER:
	case MLX5_CMD_OP_INIT_HCA:
	case MLX5_CMD_OP_ENABLE_HCA:
	case MLX5_CMD_OP_QUERY_PAGES:
	case MLX5_CMD_OP_SET_HCA_CAP:
	case MLX5_CMD_OP_QUERY_ISSI:
	case MLX5_CMD_OP_SET_ISSI:
	case MLX5_CMD_OP_CREATE_MKEY:
	case MLX5_CMD_OP_QUERY_MKEY:
	case MLX5_CMD_OP_QUERY_SPECIAL_CONTEXTS:
	case MLX5_CMD_OP_CREATE_EQ:
	case MLX5_CMD_OP_QUERY_EQ:
	case MLX5_CMD_OP_GEN_EQE:
	case MLX5_CMD_OP_CREATE_CQ:
	case MLX5_CMD_OP_QUERY_CQ:
	case MLX5_CMD_OP_MODIFY_CQ:
	case MLX5_CMD_OP_CREATE_QP:
	case MLX5_CMD_OP_RST2INIT_QP:
	case MLX5_CMD_OP_INIT2RTR_QP:
	case MLX5_CMD_OP_RTR2RTS_QP:
	case MLX5_CMD_OP_RTS2RTS_QP:
	case MLX5_CMD_OP_SQERR2RTS_QP:
	case MLX5_CMD_OP_QUERY_QP:
	case MLX5_CMD_OP_SQD_RTS_QP:
	case MLX5_CMD_OP_INIT2INIT_QP:
	case MLX5_CMD_OP_CREATE_PSV:
	case MLX5_CMD_OP_CREATE_SRQ:
	case MLX5_CMD_OP_QUERY_SRQ:
	case MLX5_CMD_OP_ARM_RQ:
	case MLX5_CMD_OP_CREATE_XRC_SRQ:
	case MLX5_CMD_OP_QUERY_XRC_SRQ:
	case MLX5_CMD_OP_ARM_XRC_SRQ:
	case MLX5_CMD_OP_CREATE_XRQ:
	case MLX5_CMD_OP_QUERY_XRQ:
	case MLX5_CMD_OP_ARM_XRQ:
	case MLX5_CMD_OP_CREATE_DCT:
	case MLX5_CMD_OP_DRAIN_DCT:
	case MLX5_CMD_OP_QUERY_DCT:
	case MLX5_CMD_OP_ARM_DCT_FOR_KEY_VIOLATION:
	case MLX5_CMD_OP_QUERY_VPORT_STATE:
	case MLX5_CMD_OP_MODIFY_VPORT_STATE:
	case MLX5_CMD_OP_QUERY_ESW_VPORT_CONTEXT:
	case MLX5_CMD_OP_MODIFY_ESW_VPORT_CONTEXT:
	case MLX5_CMD_OP_QUERY_NIC_VPORT_CONTEXT:
	case MLX5_CMD_OP_QUERY_ROCE_ADDRESS:
	case MLX5_CMD_OP_SET_ROCE_ADDRESS:
	case MLX5_CMD_OP_QUERY_HCA_VPORT_CONTEXT:
	case MLX5_CMD_OP_MODIFY_HCA_VPORT_CONTEXT:
	case MLX5_CMD_OP_QUERY_HCA_VPORT_GID:
	case MLX5_CMD_OP_QUERY_HCA_VPORT_PKEY:
	case MLX5_CMD_OP_QUERY_VNIC_ENV:
	case MLX5_CMD_OP_QUERY_VPORT_COUNTER:
	case MLX5_CMD_OP_ALLOC_Q_COUNTER:
	case MLX5_CMD_OP_QUERY_Q_COUNTER:
	case MLX5_CMD_OP_SET_MONITOR_COUNTER:
	case MLX5_CMD_OP_ARM_MONITOR_COUNTER:
	case MLX5_CMD_OP_SET_PP_RATE_LIMIT:
	case MLX5_CMD_OP_QUERY_RATE_LIMIT:
	case MLX5_CMD_OP_CREATE_SCHEDULING_ELEMENT:
	case MLX5_CMD_OP_QUERY_SCHEDULING_ELEMENT:
	case MLX5_CMD_OP_MODIFY_SCHEDULING_ELEMENT:
	case MLX5_CMD_OP_CREATE_QOS_PARA_VPORT:
	case MLX5_CMD_OP_ALLOC_PD:
	case MLX5_CMD_OP_ALLOC_UAR:
	case MLX5_CMD_OP_CONFIG_INT_MODERATION:
	case MLX5_CMD_OP_ACCESS_REG:
	case MLX5_CMD_OP_ATTACH_TO_MCG:
	case MLX5_CMD_OP_GET_DROPPED_PACKET_LOG:
	case MLX5_CMD_OP_MAD_IFC:
	case MLX5_CMD_OP_QUERY_MAD_DEMUX:
	case MLX5_CMD_OP_SET_MAD_DEMUX:
	case MLX5_CMD_OP_NOP:
	case MLX5_CMD_OP_ALLOC_XRCD:
	case MLX5_CMD_OP_ALLOC_TRANSPORT_DOMAIN:
	case MLX5_CMD_OP_QUERY_CONG_STATUS:
	case MLX5_CMD_OP_MODIFY_CONG_STATUS:
	case MLX5_CMD_OP_QUERY_CONG_PARAMS:
	case MLX5_CMD_OP_MODIFY_CONG_PARAMS:
	case MLX5_CMD_OP_QUERY_CONG_STATISTICS:
	case MLX5_CMD_OP_ADD_VXLAN_UDP_DPORT:
	case MLX5_CMD_OP_SET_L2_TABLE_ENTRY:
	case MLX5_CMD_OP_QUERY_L2_TABLE_ENTRY:
	case MLX5_CMD_OP_CREATE_LAG:
	case MLX5_CMD_OP_MODIFY_LAG:
	case MLX5_CMD_OP_QUERY_LAG:
	case MLX5_CMD_OP_CREATE_VPORT_LAG:
	case MLX5_CMD_OP_CREATE_TIR:
	case MLX5_CMD_OP_MODIFY_TIR:
	case MLX5_CMD_OP_QUERY_TIR:
	case MLX5_CMD_OP_CREATE_SQ:
	case MLX5_CMD_OP_MODIFY_SQ:
	case MLX5_CMD_OP_QUERY_SQ:
	case MLX5_CMD_OP_CREATE_RQ:
	case MLX5_CMD_OP_MODIFY_RQ:
	case MLX5_CMD_OP_QUERY_RQ:
	case MLX5_CMD_OP_CREATE_RMP:
	case MLX5_CMD_OP_MODIFY_RMP:
	case MLX5_CMD_OP_QUERY_RMP:
	case MLX5_CMD_OP_CREATE_TIS:
	case MLX5_CMD_OP_MODIFY_TIS:
	case MLX5_CMD_OP_QUERY_TIS:
	case MLX5_CMD_OP_CREATE_RQT:
	case MLX5_CMD_OP_QUERY_RQT:

	case MLX5_CMD_OP_CREATE_FLOW_TABLE:
	case MLX5_CMD_OP_QUERY_FLOW_TABLE:
	case MLX5_CMD_OP_CREATE_FLOW_GROUP:
	case MLX5_CMD_OP_QUERY_FLOW_GROUP:
	case MLX5_CMD_OP_QUERY_FLOW_TABLE_ENTRY:
	case MLX5_CMD_OP_ALLOC_FLOW_COUNTER:
	case MLX5_CMD_OP_QUERY_FLOW_COUNTER:
	case MLX5_CMD_OP_ALLOC_PACKET_REFORMAT_CONTEXT:
	case MLX5_CMD_OP_ALLOC_MODIFY_HEADER_CONTEXT:
	case MLX5_CMD_OP_FPGA_CREATE_QP:
	case MLX5_CMD_OP_FPGA_MODIFY_QP:
	case MLX5_CMD_OP_FPGA_QUERY_QP:
	case MLX5_CMD_OP_FPGA_QUERY_QP_COUNTERS:
	case MLX5_CMD_OP_CREATE_GENERAL_OBJECT:
	case MLX5_CMD_OP_MODIFY_GENERAL_OBJECT:
	case MLX5_CMD_OP_QUERY_GENERAL_OBJECT:
	case MLX5_CMD_OP_CREATE_UCTX:
	case MLX5_CMD_OP_CREATE_UMEM:
	case MLX5_CMD_OP_ALLOC_MEMIC:
	case MLX5_CMD_OP_MODIFY_XRQ:
	case MLX5_CMD_OP_RELEASE_XRQ_ERROR:
	case MLX5_CMD_OP_QUERY_VHCA_STATE:
	case MLX5_CMD_OP_MODIFY_VHCA_STATE:
	case MLX5_CMD_OP_ALLOC_SF:
	case MLX5_CMD_OP_SUSPEND_VHCA:
	case MLX5_CMD_OP_RESUME_VHCA:
	case MLX5_CMD_OP_QUERY_VHCA_MIGRATION_STATE:
	case MLX5_CMD_OP_SAVE_VHCA_STATE:
	case MLX5_CMD_OP_LOAD_VHCA_STATE:
	case MLX5_CMD_OP_SYNC_CRYPTO:
	case MLX5_CMD_OP_ALLOW_OTHER_VHCA_ACCESS:
		*status = MLX5_DRIVER_STATUS_ABORTED;
		*synd = MLX5_DRIVER_SYND;
		return -ENOLINK;
	default:
		mlx5_core_err(dev, "Unknown FW command (%d)\n", op);
		return -EINVAL;
	}
}

const char *mlx5_command_str(int command)
{
#define MLX5_COMMAND_STR_CASE(__cmd) case MLX5_CMD_OP_ ## __cmd: return #__cmd

	switch (command) {
	MLX5_COMMAND_STR_CASE(QUERY_HCA_CAP);
	MLX5_COMMAND_STR_CASE(QUERY_ADAPTER);
	MLX5_COMMAND_STR_CASE(INIT_HCA);
	MLX5_COMMAND_STR_CASE(TEARDOWN_HCA);
	MLX5_COMMAND_STR_CASE(ENABLE_HCA);
	MLX5_COMMAND_STR_CASE(DISABLE_HCA);
	MLX5_COMMAND_STR_CASE(QUERY_PAGES);
	MLX5_COMMAND_STR_CASE(MANAGE_PAGES);
	MLX5_COMMAND_STR_CASE(SET_HCA_CAP);
	MLX5_COMMAND_STR_CASE(QUERY_ISSI);
	MLX5_COMMAND_STR_CASE(SET_ISSI);
	MLX5_COMMAND_STR_CASE(SET_DRIVER_VERSION);
	MLX5_COMMAND_STR_CASE(CREATE_MKEY);
	MLX5_COMMAND_STR_CASE(QUERY_MKEY);
	MLX5_COMMAND_STR_CASE(DESTROY_MKEY);
	MLX5_COMMAND_STR_CASE(QUERY_SPECIAL_CONTEXTS);
	MLX5_COMMAND_STR_CASE(PAGE_FAULT_RESUME);
	MLX5_COMMAND_STR_CASE(CREATE_EQ);
	MLX5_COMMAND_STR_CASE(DESTROY_EQ);
	MLX5_COMMAND_STR_CASE(QUERY_EQ);
	MLX5_COMMAND_STR_CASE(GEN_EQE);
	MLX5_COMMAND_STR_CASE(CREATE_CQ);
	MLX5_COMMAND_STR_CASE(DESTROY_CQ);
	MLX5_COMMAND_STR_CASE(QUERY_CQ);
	MLX5_COMMAND_STR_CASE(MODIFY_CQ);
	MLX5_COMMAND_STR_CASE(CREATE_QP);
	MLX5_COMMAND_STR_CASE(DESTROY_QP);
	MLX5_COMMAND_STR_CASE(RST2INIT_QP);
	MLX5_COMMAND_STR_CASE(INIT2RTR_QP);
	MLX5_COMMAND_STR_CASE(RTR2RTS_QP);
	MLX5_COMMAND_STR_CASE(RTS2RTS_QP);
	MLX5_COMMAND_STR_CASE(SQERR2RTS_QP);
	MLX5_COMMAND_STR_CASE(2ERR_QP);
	MLX5_COMMAND_STR_CASE(2RST_QP);
	MLX5_COMMAND_STR_CASE(QUERY_QP);
	MLX5_COMMAND_STR_CASE(SQD_RTS_QP);
	MLX5_COMMAND_STR_CASE(INIT2INIT_QP);
	MLX5_COMMAND_STR_CASE(CREATE_PSV);
	MLX5_COMMAND_STR_CASE(DESTROY_PSV);
	MLX5_COMMAND_STR_CASE(CREATE_SRQ);
	MLX5_COMMAND_STR_CASE(DESTROY_SRQ);
	MLX5_COMMAND_STR_CASE(QUERY_SRQ);
	MLX5_COMMAND_STR_CASE(ARM_RQ);
	MLX5_COMMAND_STR_CASE(CREATE_XRC_SRQ);
	MLX5_COMMAND_STR_CASE(DESTROY_XRC_SRQ);
	MLX5_COMMAND_STR_CASE(QUERY_XRC_SRQ);
	MLX5_COMMAND_STR_CASE(ARM_XRC_SRQ);
	MLX5_COMMAND_STR_CASE(CREATE_DCT);
	MLX5_COMMAND_STR_CASE(DESTROY_DCT);
	MLX5_COMMAND_STR_CASE(DRAIN_DCT);
	MLX5_COMMAND_STR_CASE(QUERY_DCT);
	MLX5_COMMAND_STR_CASE(ARM_DCT_FOR_KEY_VIOLATION);
	MLX5_COMMAND_STR_CASE(QUERY_VPORT_STATE);
	MLX5_COMMAND_STR_CASE(MODIFY_VPORT_STATE);
	MLX5_COMMAND_STR_CASE(QUERY_ESW_VPORT_CONTEXT);
	MLX5_COMMAND_STR_CASE(MODIFY_ESW_VPORT_CONTEXT);
	MLX5_COMMAND_STR_CASE(QUERY_NIC_VPORT_CONTEXT);
	MLX5_COMMAND_STR_CASE(MODIFY_NIC_VPORT_CONTEXT);
	MLX5_COMMAND_STR_CASE(QUERY_ROCE_ADDRESS);
	MLX5_COMMAND_STR_CASE(SET_ROCE_ADDRESS);
	MLX5_COMMAND_STR_CASE(QUERY_HCA_VPORT_CONTEXT);
	MLX5_COMMAND_STR_CASE(MODIFY_HCA_VPORT_CONTEXT);
	MLX5_COMMAND_STR_CASE(QUERY_HCA_VPORT_GID);
	MLX5_COMMAND_STR_CASE(QUERY_HCA_VPORT_PKEY);
	MLX5_COMMAND_STR_CASE(QUERY_VNIC_ENV);
	MLX5_COMMAND_STR_CASE(QUERY_VPORT_COUNTER);
	MLX5_COMMAND_STR_CASE(ALLOC_Q_COUNTER);
	MLX5_COMMAND_STR_CASE(DEALLOC_Q_COUNTER);
	MLX5_COMMAND_STR_CASE(QUERY_Q_COUNTER);
	MLX5_COMMAND_STR_CASE(SET_MONITOR_COUNTER);
	MLX5_COMMAND_STR_CASE(ARM_MONITOR_COUNTER);
	MLX5_COMMAND_STR_CASE(SET_PP_RATE_LIMIT);
	MLX5_COMMAND_STR_CASE(QUERY_RATE_LIMIT);
	MLX5_COMMAND_STR_CASE(CREATE_SCHEDULING_ELEMENT);
	MLX5_COMMAND_STR_CASE(DESTROY_SCHEDULING_ELEMENT);
	MLX5_COMMAND_STR_CASE(QUERY_SCHEDULING_ELEMENT);
	MLX5_COMMAND_STR_CASE(MODIFY_SCHEDULING_ELEMENT);
	MLX5_COMMAND_STR_CASE(CREATE_QOS_PARA_VPORT);
	MLX5_COMMAND_STR_CASE(DESTROY_QOS_PARA_VPORT);
	MLX5_COMMAND_STR_CASE(ALLOC_PD);
	MLX5_COMMAND_STR_CASE(DEALLOC_PD);
	MLX5_COMMAND_STR_CASE(ALLOC_UAR);
	MLX5_COMMAND_STR_CASE(DEALLOC_UAR);
	MLX5_COMMAND_STR_CASE(CONFIG_INT_MODERATION);
	MLX5_COMMAND_STR_CASE(ACCESS_REG);
	MLX5_COMMAND_STR_CASE(ATTACH_TO_MCG);
	MLX5_COMMAND_STR_CASE(DETACH_FROM_MCG);
	MLX5_COMMAND_STR_CASE(GET_DROPPED_PACKET_LOG);
	MLX5_COMMAND_STR_CASE(MAD_IFC);
	MLX5_COMMAND_STR_CASE(QUERY_MAD_DEMUX);
	MLX5_COMMAND_STR_CASE(SET_MAD_DEMUX);
	MLX5_COMMAND_STR_CASE(NOP);
	MLX5_COMMAND_STR_CASE(ALLOC_XRCD);
	MLX5_COMMAND_STR_CASE(DEALLOC_XRCD);
	MLX5_COMMAND_STR_CASE(ALLOC_TRANSPORT_DOMAIN);
	MLX5_COMMAND_STR_CASE(DEALLOC_TRANSPORT_DOMAIN);
	MLX5_COMMAND_STR_CASE(QUERY_CONG_STATUS);
	MLX5_COMMAND_STR_CASE(MODIFY_CONG_STATUS);
	MLX5_COMMAND_STR_CASE(QUERY_CONG_PARAMS);
	MLX5_COMMAND_STR_CASE(MODIFY_CONG_PARAMS);
	MLX5_COMMAND_STR_CASE(QUERY_CONG_STATISTICS);
	MLX5_COMMAND_STR_CASE(ADD_VXLAN_UDP_DPORT);
	MLX5_COMMAND_STR_CASE(DELETE_VXLAN_UDP_DPORT);
	MLX5_COMMAND_STR_CASE(SET_L2_TABLE_ENTRY);
	MLX5_COMMAND_STR_CASE(QUERY_L2_TABLE_ENTRY);
	MLX5_COMMAND_STR_CASE(DELETE_L2_TABLE_ENTRY);
	MLX5_COMMAND_STR_CASE(SET_WOL_ROL);
	MLX5_COMMAND_STR_CASE(QUERY_WOL_ROL);
	MLX5_COMMAND_STR_CASE(CREATE_LAG);
	MLX5_COMMAND_STR_CASE(MODIFY_LAG);
	MLX5_COMMAND_STR_CASE(QUERY_LAG);
	MLX5_COMMAND_STR_CASE(DESTROY_LAG);
	MLX5_COMMAND_STR_CASE(CREATE_VPORT_LAG);
	MLX5_COMMAND_STR_CASE(DESTROY_VPORT_LAG);
	MLX5_COMMAND_STR_CASE(CREATE_TIR);
	MLX5_COMMAND_STR_CASE(MODIFY_TIR);
	MLX5_COMMAND_STR_CASE(DESTROY_TIR);
	MLX5_COMMAND_STR_CASE(QUERY_TIR);
	MLX5_COMMAND_STR_CASE(CREATE_SQ);
	MLX5_COMMAND_STR_CASE(MODIFY_SQ);
	MLX5_COMMAND_STR_CASE(DESTROY_SQ);
	MLX5_COMMAND_STR_CASE(QUERY_SQ);
	MLX5_COMMAND_STR_CASE(CREATE_RQ);
	MLX5_COMMAND_STR_CASE(MODIFY_RQ);
	MLX5_COMMAND_STR_CASE(DESTROY_RQ);
	MLX5_COMMAND_STR_CASE(QUERY_RQ);
	MLX5_COMMAND_STR_CASE(CREATE_RMP);
	MLX5_COMMAND_STR_CASE(MODIFY_RMP);
	MLX5_COMMAND_STR_CASE(DESTROY_RMP);
	MLX5_COMMAND_STR_CASE(QUERY_RMP);
	MLX5_COMMAND_STR_CASE(CREATE_TIS);
	MLX5_COMMAND_STR_CASE(MODIFY_TIS);
	MLX5_COMMAND_STR_CASE(DESTROY_TIS);
	MLX5_COMMAND_STR_CASE(QUERY_TIS);
	MLX5_COMMAND_STR_CASE(CREATE_RQT);
	MLX5_COMMAND_STR_CASE(MODIFY_RQT);
	MLX5_COMMAND_STR_CASE(DESTROY_RQT);
	MLX5_COMMAND_STR_CASE(QUERY_RQT);
	MLX5_COMMAND_STR_CASE(SET_FLOW_TABLE_ROOT);
	MLX5_COMMAND_STR_CASE(CREATE_FLOW_TABLE);
	MLX5_COMMAND_STR_CASE(DESTROY_FLOW_TABLE);
	MLX5_COMMAND_STR_CASE(QUERY_FLOW_TABLE);
	MLX5_COMMAND_STR_CASE(CREATE_FLOW_GROUP);
	MLX5_COMMAND_STR_CASE(DESTROY_FLOW_GROUP);
	MLX5_COMMAND_STR_CASE(QUERY_FLOW_GROUP);
	MLX5_COMMAND_STR_CASE(SET_FLOW_TABLE_ENTRY);
	MLX5_COMMAND_STR_CASE(QUERY_FLOW_TABLE_ENTRY);
	MLX5_COMMAND_STR_CASE(DELETE_FLOW_TABLE_ENTRY);
	MLX5_COMMAND_STR_CASE(ALLOC_FLOW_COUNTER);
	MLX5_COMMAND_STR_CASE(DEALLOC_FLOW_COUNTER);
	MLX5_COMMAND_STR_CASE(QUERY_FLOW_COUNTER);
	MLX5_COMMAND_STR_CASE(MODIFY_FLOW_TABLE);
	MLX5_COMMAND_STR_CASE(ALLOC_PACKET_REFORMAT_CONTEXT);
	MLX5_COMMAND_STR_CASE(DEALLOC_PACKET_REFORMAT_CONTEXT);
	MLX5_COMMAND_STR_CASE(ALLOC_MODIFY_HEADER_CONTEXT);
	MLX5_COMMAND_STR_CASE(DEALLOC_MODIFY_HEADER_CONTEXT);
	MLX5_COMMAND_STR_CASE(FPGA_CREATE_QP);
	MLX5_COMMAND_STR_CASE(FPGA_MODIFY_QP);
	MLX5_COMMAND_STR_CASE(FPGA_QUERY_QP);
	MLX5_COMMAND_STR_CASE(FPGA_QUERY_QP_COUNTERS);
	MLX5_COMMAND_STR_CASE(FPGA_DESTROY_QP);
	MLX5_COMMAND_STR_CASE(CREATE_XRQ);
	MLX5_COMMAND_STR_CASE(DESTROY_XRQ);
	MLX5_COMMAND_STR_CASE(QUERY_XRQ);
	MLX5_COMMAND_STR_CASE(ARM_XRQ);
	MLX5_COMMAND_STR_CASE(CREATE_GENERAL_OBJECT);
	MLX5_COMMAND_STR_CASE(DESTROY_GENERAL_OBJECT);
	MLX5_COMMAND_STR_CASE(MODIFY_GENERAL_OBJECT);
	MLX5_COMMAND_STR_CASE(QUERY_GENERAL_OBJECT);
	MLX5_COMMAND_STR_CASE(QUERY_MODIFY_HEADER_CONTEXT);
	MLX5_COMMAND_STR_CASE(ALLOC_MEMIC);
	MLX5_COMMAND_STR_CASE(DEALLOC_MEMIC);
	MLX5_COMMAND_STR_CASE(QUERY_ESW_FUNCTIONS);
	MLX5_COMMAND_STR_CASE(CREATE_UCTX);
	MLX5_COMMAND_STR_CASE(DESTROY_UCTX);
	MLX5_COMMAND_STR_CASE(CREATE_UMEM);
	MLX5_COMMAND_STR_CASE(DESTROY_UMEM);
	MLX5_COMMAND_STR_CASE(RELEASE_XRQ_ERROR);
	MLX5_COMMAND_STR_CASE(MODIFY_XRQ);
	MLX5_COMMAND_STR_CASE(QUERY_VHCA_STATE);
	MLX5_COMMAND_STR_CASE(MODIFY_VHCA_STATE);
	MLX5_COMMAND_STR_CASE(ALLOC_SF);
	MLX5_COMMAND_STR_CASE(DEALLOC_SF);
	MLX5_COMMAND_STR_CASE(SUSPEND_VHCA);
	MLX5_COMMAND_STR_CASE(RESUME_VHCA);
	MLX5_COMMAND_STR_CASE(QUERY_VHCA_MIGRATION_STATE);
	MLX5_COMMAND_STR_CASE(SAVE_VHCA_STATE);
	MLX5_COMMAND_STR_CASE(LOAD_VHCA_STATE);
	MLX5_COMMAND_STR_CASE(SYNC_CRYPTO);
	MLX5_COMMAND_STR_CASE(ALLOW_OTHER_VHCA_ACCESS);
	default: return "unknown command opcode";
	}
}

static const char *cmd_status_str(u8 status)
{
	switch (status) {
	case MLX5_CMD_STAT_OK:
		return "OK";
	case MLX5_CMD_STAT_INT_ERR:
		return "internal error";
	case MLX5_CMD_STAT_BAD_OP_ERR:
		return "bad operation";
	case MLX5_CMD_STAT_BAD_PARAM_ERR:
		return "bad parameter";
	case MLX5_CMD_STAT_BAD_SYS_STATE_ERR:
		return "bad system state";
	case MLX5_CMD_STAT_BAD_RES_ERR:
		return "bad resource";
	case MLX5_CMD_STAT_RES_BUSY:
		return "resource busy";
	case MLX5_CMD_STAT_LIM_ERR:
		return "limits exceeded";
	case MLX5_CMD_STAT_BAD_RES_STATE_ERR:
		return "bad resource state";
	case MLX5_CMD_STAT_IX_ERR:
		return "bad index";
	case MLX5_CMD_STAT_NO_RES_ERR:
		return "no resources";
	case MLX5_CMD_STAT_BAD_INP_LEN_ERR:
		return "bad input length";
	case MLX5_CMD_STAT_BAD_OUTP_LEN_ERR:
		return "bad output length";
	case MLX5_CMD_STAT_BAD_QP_STATE_ERR:
		return "bad QP state";
	case MLX5_CMD_STAT_BAD_PKT_ERR:
		return "bad packet (discarded)";
	case MLX5_CMD_STAT_BAD_SIZE_OUTS_CQES_ERR:
		return "bad size too many outstanding CQEs";
	default:
		return "unknown status";
	}
}

static int cmd_status_to_err(u8 status)
{
	switch (status) {
	case MLX5_CMD_STAT_OK:				return 0;
	case MLX5_CMD_STAT_INT_ERR:			return -EIO;
	case MLX5_CMD_STAT_BAD_OP_ERR:			return -EINVAL;
	case MLX5_CMD_STAT_BAD_PARAM_ERR:		return -EINVAL;
	case MLX5_CMD_STAT_BAD_SYS_STATE_ERR:		return -EIO;
	case MLX5_CMD_STAT_BAD_RES_ERR:			return -EINVAL;
	case MLX5_CMD_STAT_RES_BUSY:			return -EBUSY;
	case MLX5_CMD_STAT_LIM_ERR:			return -ENOMEM;
	case MLX5_CMD_STAT_BAD_RES_STATE_ERR:		return -EINVAL;
	case MLX5_CMD_STAT_IX_ERR:			return -EINVAL;
	case MLX5_CMD_STAT_NO_RES_ERR:			return -EAGAIN;
	case MLX5_CMD_STAT_BAD_INP_LEN_ERR:		return -EIO;
	case MLX5_CMD_STAT_BAD_OUTP_LEN_ERR:		return -EIO;
	case MLX5_CMD_STAT_BAD_QP_STATE_ERR:		return -EINVAL;
	case MLX5_CMD_STAT_BAD_PKT_ERR:			return -EINVAL;
	case MLX5_CMD_STAT_BAD_SIZE_OUTS_CQES_ERR:	return -EINVAL;
	default:					return -EIO;
	}
}

void mlx5_cmd_out_err(struct mlx5_core_dev *dev, u16 opcode, u16 op_mod, void *out)
{
	u32 syndrome = MLX5_GET(mbox_out, out, syndrome);
	u8 status = MLX5_GET(mbox_out, out, status);

	mlx5_core_err_rl(dev,
			 "%s(0x%x) op_mod(0x%x) failed, status %s(0x%x), syndrome (0x%x), err(%d)\n",
			 mlx5_command_str(opcode), opcode, op_mod,
			 cmd_status_str(status), status, syndrome, cmd_status_to_err(status));
}
EXPORT_SYMBOL(mlx5_cmd_out_err);

static void cmd_status_print(struct mlx5_core_dev *dev, void *in, void *out)
{
	u16 opcode, op_mod;
	u16 uid;

	opcode = in_to_opcode(in);
	op_mod = MLX5_GET(mbox_in, in, op_mod);
	uid    = MLX5_GET(mbox_in, in, uid);

	if (!uid && opcode != MLX5_CMD_OP_DESTROY_MKEY &&
	    opcode != MLX5_CMD_OP_CREATE_UCTX)
		mlx5_cmd_out_err(dev, opcode, op_mod, out);
}

int mlx5_cmd_check(struct mlx5_core_dev *dev, int err, void *in, void *out)
{
	/* aborted due to PCI error or via reset flow mlx5_cmd_trigger_completions() */
	if (err == -ENXIO) {
		u16 opcode = in_to_opcode(in);
		u32 syndrome;
		u8 status;

		/* PCI Error, emulate command return status, for smooth reset */
		err = mlx5_internal_err_ret_value(dev, opcode, &syndrome, &status);
		MLX5_SET(mbox_out, out, status, status);
		MLX5_SET(mbox_out, out, syndrome, syndrome);
		if (!err)
			return 0;
	}

	/* driver or FW delivery error */
	if (err != -EREMOTEIO && err)
		return err;

	/* check outbox status */
	err = cmd_status_to_err(MLX5_GET(mbox_out, out, status));
	if (err)
		cmd_status_print(dev, in, out);

	return err;
}
EXPORT_SYMBOL(mlx5_cmd_check);

static void dump_command(struct mlx5_core_dev *dev,
			 struct mlx5_cmd_work_ent *ent, int input)
{
	struct mlx5_cmd_msg *msg = input ? ent->in : ent->out;
	struct mlx5_cmd_mailbox *next = msg->next;
	int n = mlx5_calc_cmd_blocks(msg);
	u16 op = ent->op;
	int data_only;
	u32 offset = 0;
	int dump_len;
	int i;

	mlx5_core_dbg(dev, "cmd[%d]: start dump\n", ent->idx);
	data_only = !!(mlx5_core_debug_mask & (1 << MLX5_CMD_DATA));

	if (data_only)
		mlx5_core_dbg_mask(dev, 1 << MLX5_CMD_DATA,
				   "cmd[%d]: dump command data %s(0x%x) %s\n",
				   ent->idx, mlx5_command_str(op), op,
				   input ? "INPUT" : "OUTPUT");
	else
		mlx5_core_dbg(dev, "cmd[%d]: dump command %s(0x%x) %s\n",
			      ent->idx, mlx5_command_str(op), op,
			      input ? "INPUT" : "OUTPUT");

	if (data_only) {
		if (input) {
			dump_buf(ent->lay->in, sizeof(ent->lay->in), 1, offset, ent->idx);
			offset += sizeof(ent->lay->in);
		} else {
			dump_buf(ent->lay->out, sizeof(ent->lay->out), 1, offset, ent->idx);
			offset += sizeof(ent->lay->out);
		}
	} else {
		dump_buf(ent->lay, sizeof(*ent->lay), 0, offset, ent->idx);
		offset += sizeof(*ent->lay);
	}

	for (i = 0; i < n && next; i++)  {
		if (data_only) {
			dump_len = min_t(int, MLX5_CMD_DATA_BLOCK_SIZE, msg->len - offset);
			dump_buf(next->buf, dump_len, 1, offset, ent->idx);
			offset += MLX5_CMD_DATA_BLOCK_SIZE;
		} else {
			mlx5_core_dbg(dev, "cmd[%d]: command block:\n", ent->idx);
			dump_buf(next->buf, sizeof(struct mlx5_cmd_prot_block), 0, offset,
				 ent->idx);
			offset += sizeof(struct mlx5_cmd_prot_block);
		}
		next = next->next;
	}

	if (data_only)
		pr_debug("\n");

	mlx5_core_dbg(dev, "cmd[%d]: end dump\n", ent->idx);
}

static void mlx5_cmd_comp_handler(struct mlx5_core_dev *dev, u64 vec, bool forced);

static void cb_timeout_handler(struct work_struct *work)
{
	struct delayed_work *dwork = container_of(work, struct delayed_work,
						  work);
	struct mlx5_cmd_work_ent *ent = container_of(dwork,
						     struct mlx5_cmd_work_ent,
						     cb_timeout_work);
	struct mlx5_core_dev *dev = container_of(ent->cmd, struct mlx5_core_dev,
						 cmd);

	mlx5_cmd_eq_recover(dev);

	/* Maybe got handled by eq recover ? */
	if (!test_bit(MLX5_CMD_ENT_STATE_PENDING_COMP, &ent->state)) {
		mlx5_core_warn(dev, "cmd[%d]: %s(0x%x) Async, recovered after timeout\n", ent->idx,
			       mlx5_command_str(ent->op), ent->op);
		goto out; /* phew, already handled */
	}

	ent->ret = -ETIMEDOUT;
	mlx5_core_warn(dev, "cmd[%d]: %s(0x%x) Async, timeout. Will cause a leak of a command resource\n",
		       ent->idx, mlx5_command_str(ent->op), ent->op);
	mlx5_cmd_comp_handler(dev, 1ULL << ent->idx, true);

out:
	cmd_ent_put(ent); /* for the cmd_ent_get() took on schedule delayed work */
}

static void free_msg(struct mlx5_core_dev *dev, struct mlx5_cmd_msg *msg);
static void mlx5_free_cmd_msg(struct mlx5_core_dev *dev,
			      struct mlx5_cmd_msg *msg);

static bool opcode_allowed(struct mlx5_cmd *cmd, u16 opcode)
{
	if (cmd->allowed_opcode == CMD_ALLOWED_OPCODE_ALL)
		return true;

	return cmd->allowed_opcode == opcode;
}

bool mlx5_cmd_is_down(struct mlx5_core_dev *dev)
{
	return pci_channel_offline(dev->pdev) ||
	       dev->cmd.state != MLX5_CMDIF_STATE_UP ||
	       dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR;
}

static void cmd_work_handler(struct work_struct *work)
{
	struct mlx5_cmd_work_ent *ent = container_of(work, struct mlx5_cmd_work_ent, work);
	struct mlx5_cmd *cmd = ent->cmd;
	bool poll_cmd = ent->polling;
	struct mlx5_cmd_layout *lay;
	struct mlx5_core_dev *dev;
	unsigned long cb_timeout;
	struct semaphore *sem;
	unsigned long flags;
	int alloc_ret;
	int cmd_mode;

	dev = container_of(cmd, struct mlx5_core_dev, cmd);
	cb_timeout = msecs_to_jiffies(mlx5_tout_ms(dev, CMD));

	complete(&ent->handling);
	sem = ent->page_queue ? &cmd->vars.pages_sem : &cmd->vars.sem;
	down(sem);
	if (!ent->page_queue) {
		alloc_ret = cmd_alloc_index(cmd, ent);
		if (alloc_ret < 0) {
			mlx5_core_err_rl(dev, "failed to allocate command entry\n");
			if (ent->callback) {
				ent->callback(-EAGAIN, ent->context);
				mlx5_free_cmd_msg(dev, ent->out);
				free_msg(dev, ent->in);
				cmd_ent_put(ent);
			} else {
				ent->ret = -EAGAIN;
				complete(&ent->done);
			}
			up(sem);
			return;
		}
	} else {
		ent->idx = cmd->vars.max_reg_cmds;
		spin_lock_irqsave(&cmd->alloc_lock, flags);
		clear_bit(ent->idx, &cmd->vars.bitmask);
		cmd->ent_arr[ent->idx] = ent;
		spin_unlock_irqrestore(&cmd->alloc_lock, flags);
	}

	lay = get_inst(cmd, ent->idx);
	ent->lay = lay;
	memset(lay, 0, sizeof(*lay));
	memcpy(lay->in, ent->in->first.data, sizeof(lay->in));
	if (ent->in->next)
		lay->in_ptr = cpu_to_be64(ent->in->next->dma);
	lay->inlen = cpu_to_be32(ent->in->len);
	if (ent->out->next)
		lay->out_ptr = cpu_to_be64(ent->out->next->dma);
	lay->outlen = cpu_to_be32(ent->out->len);
	lay->type = MLX5_PCI_CMD_XPORT;
	lay->token = ent->token;
	lay->status_own = CMD_OWNER_HW;
	set_signature(ent, !cmd->checksum_disabled);
	dump_command(dev, ent, 1);
	ent->ts1 = ktime_get_ns();
	cmd_mode = cmd->mode;

	if (ent->callback && schedule_delayed_work(&ent->cb_timeout_work, cb_timeout))
		cmd_ent_get(ent);
	set_bit(MLX5_CMD_ENT_STATE_PENDING_COMP, &ent->state);

	cmd_ent_get(ent); /* for the _real_ FW event on completion */
	/* Skip sending command to fw if internal error */
	if (mlx5_cmd_is_down(dev) || !opcode_allowed(&dev->cmd, ent->op)) {
		ent->ret = -ENXIO;
		mlx5_cmd_comp_handler(dev, 1ULL << ent->idx, true);
		return;
	}

	/* ring doorbell after the descriptor is valid */
	mlx5_core_dbg(dev, "writing 0x%x to command doorbell\n", 1 << ent->idx);
	wmb();
	iowrite32be(1 << ent->idx, &dev->iseg->cmd_dbell);
	/* if not in polling don't use ent after this point */
	if (cmd_mode == CMD_MODE_POLLING || poll_cmd) {
		poll_timeout(ent);
		/* make sure we read the descriptor after ownership is SW */
		rmb();
		mlx5_cmd_comp_handler(dev, 1ULL << ent->idx, (ent->ret == -ETIMEDOUT));
	}
}

static int deliv_status_to_err(u8 status)
{
	switch (status) {
	case MLX5_CMD_DELIVERY_STAT_OK:
	case MLX5_DRIVER_STATUS_ABORTED:
		return 0;
	case MLX5_CMD_DELIVERY_STAT_SIGNAT_ERR:
	case MLX5_CMD_DELIVERY_STAT_TOK_ERR:
		return -EBADR;
	case MLX5_CMD_DELIVERY_STAT_BAD_BLK_NUM_ERR:
	case MLX5_CMD_DELIVERY_STAT_OUT_PTR_ALIGN_ERR:
	case MLX5_CMD_DELIVERY_STAT_IN_PTR_ALIGN_ERR:
		return -EFAULT; /* Bad address */
	case MLX5_CMD_DELIVERY_STAT_IN_LENGTH_ERR:
	case MLX5_CMD_DELIVERY_STAT_OUT_LENGTH_ERR:
	case MLX5_CMD_DELIVERY_STAT_CMD_DESCR_ERR:
	case MLX5_CMD_DELIVERY_STAT_RES_FLD_NOT_CLR_ERR:
		return -ENOMSG;
	case MLX5_CMD_DELIVERY_STAT_FW_ERR:
		return -EIO;
	default:
		return -EINVAL;
	}
}

static const char *deliv_status_to_str(u8 status)
{
	switch (status) {
	case MLX5_CMD_DELIVERY_STAT_OK:
		return "no errors";
	case MLX5_CMD_DELIVERY_STAT_SIGNAT_ERR:
		return "signature error";
	case MLX5_CMD_DELIVERY_STAT_TOK_ERR:
		return "token error";
	case MLX5_CMD_DELIVERY_STAT_BAD_BLK_NUM_ERR:
		return "bad block number";
	case MLX5_CMD_DELIVERY_STAT_OUT_PTR_ALIGN_ERR:
		return "output pointer not aligned to block size";
	case MLX5_CMD_DELIVERY_STAT_IN_PTR_ALIGN_ERR:
		return "input pointer not aligned to block size";
	case MLX5_CMD_DELIVERY_STAT_FW_ERR:
		return "firmware internal error";
	case MLX5_CMD_DELIVERY_STAT_IN_LENGTH_ERR:
		return "command input length error";
	case MLX5_CMD_DELIVERY_STAT_OUT_LENGTH_ERR:
		return "command output length error";
	case MLX5_CMD_DELIVERY_STAT_RES_FLD_NOT_CLR_ERR:
		return "reserved fields not cleared";
	case MLX5_CMD_DELIVERY_STAT_CMD_DESCR_ERR:
		return "bad command descriptor type";
	default:
		return "unknown status code";
	}
}

enum {
	MLX5_CMD_TIMEOUT_RECOVER_MSEC   = 5 * 1000,
};

static void wait_func_handle_exec_timeout(struct mlx5_core_dev *dev,
					  struct mlx5_cmd_work_ent *ent)
{
	unsigned long timeout = msecs_to_jiffies(MLX5_CMD_TIMEOUT_RECOVER_MSEC);

	mlx5_cmd_eq_recover(dev);

	/* Re-wait on the ent->done after executing the recovery flow. If the
	 * recovery flow (or any other recovery flow running simultaneously)
	 * has recovered an EQE, it should cause the entry to be completed by
	 * the command interface.
	 */
	if (wait_for_completion_timeout(&ent->done, timeout)) {
		mlx5_core_warn(dev, "cmd[%d]: %s(0x%x) recovered after timeout\n", ent->idx,
			       mlx5_command_str(ent->op), ent->op);
		return;
	}

	mlx5_core_warn(dev, "cmd[%d]: %s(0x%x) No done completion\n", ent->idx,
		       mlx5_command_str(ent->op), ent->op);

	ent->ret = -ETIMEDOUT;
	mlx5_cmd_comp_handler(dev, 1ULL << ent->idx, true);
}

static int wait_func(struct mlx5_core_dev *dev, struct mlx5_cmd_work_ent *ent)
{
	unsigned long timeout = msecs_to_jiffies(mlx5_tout_ms(dev, CMD));
	struct mlx5_cmd *cmd = &dev->cmd;
	int err;

	if (!wait_for_completion_timeout(&ent->handling, timeout) &&
	    cancel_work_sync(&ent->work)) {
		ent->ret = -ECANCELED;
		goto out_err;
	}
	if (cmd->mode == CMD_MODE_POLLING || ent->polling)
		wait_for_completion(&ent->done);
	else if (!wait_for_completion_timeout(&ent->done, timeout))
		wait_func_handle_exec_timeout(dev, ent);

out_err:
	err = ent->ret;

	if (err == -ETIMEDOUT) {
		mlx5_core_warn(dev, "%s(0x%x) timeout. Will cause a leak of a command resource\n",
			       mlx5_command_str(ent->op), ent->op);
	} else if (err == -ECANCELED) {
		mlx5_core_warn(dev, "%s(0x%x) canceled on out of queue timeout.\n",
			       mlx5_command_str(ent->op), ent->op);
	}
	mlx5_core_dbg(dev, "err %d, delivery status %s(%d)\n",
		      err, deliv_status_to_str(ent->status), ent->status);

	return err;
}

/*  Notes:
 *    1. Callback functions may not sleep
 *    2. page queue commands do not support asynchrous completion
 *
 * return value in case (!callback):
 *	ret < 0 : Command execution couldn't be submitted by driver
 *	ret > 0 : Command execution couldn't be performed by firmware
 *	ret == 0: Command was executed by FW, Caller must check FW outbox status.
 *
 * return value in case (callback):
 *	ret < 0 : Command execution couldn't be submitted by driver
 *	ret == 0: Command will be submitted to FW for execution
 *		  and the callback will be called for further status updates
 */
static int mlx5_cmd_invoke(struct mlx5_core_dev *dev, struct mlx5_cmd_msg *in,
			   struct mlx5_cmd_msg *out, void *uout, int uout_size,
			   mlx5_cmd_cbk_t callback,
			   void *context, int page_queue,
			   u8 token, bool force_polling)
{
	struct mlx5_cmd *cmd = &dev->cmd;
	struct mlx5_cmd_work_ent *ent;
	struct mlx5_cmd_stats *stats;
	u8 status = 0;
	int err = 0;
	s64 ds;

	if (callback && page_queue)
		return -EINVAL;

	ent = cmd_alloc_ent(cmd, in, out, uout, uout_size,
			    callback, context, page_queue);
	if (IS_ERR(ent))
		return PTR_ERR(ent);

	/* put for this ent is when consumed, depending on the use case
	 * 1) (!callback) blocking flow: by caller after wait_func completes
	 * 2) (callback) flow: by mlx5_cmd_comp_handler() when ent is handled
	 */

	ent->token = token;
	ent->polling = force_polling;

	init_completion(&ent->handling);
	if (!callback)
		init_completion(&ent->done);

	INIT_DELAYED_WORK(&ent->cb_timeout_work, cb_timeout_handler);
	INIT_WORK(&ent->work, cmd_work_handler);
	if (page_queue) {
		cmd_work_handler(&ent->work);
	} else if (!queue_work(cmd->wq, &ent->work)) {
		mlx5_core_warn(dev, "failed to queue work\n");
		err = -EALREADY;
		goto out_free;
	}

	if (callback)
		return 0; /* mlx5_cmd_comp_handler() will put(ent) */

	err = wait_func(dev, ent);
	if (err == -ETIMEDOUT || err == -ECANCELED)
		goto out_free;

	ds = ent->ts2 - ent->ts1;
	stats = xa_load(&cmd->stats, ent->op);
	if (stats) {
		spin_lock_irq(&stats->lock);
		stats->sum += ds;
		++stats->n;
		spin_unlock_irq(&stats->lock);
	}
	mlx5_core_dbg_mask(dev, 1 << MLX5_CMD_TIME,
			   "fw exec time for %s is %lld nsec\n",
			   mlx5_command_str(ent->op), ds);

out_free:
	status = ent->status;
	cmd_ent_put(ent);
	return err ? : status;
}

static ssize_t dbg_write(struct file *filp, const char __user *buf,
			 size_t count, loff_t *pos)
{
	struct mlx5_core_dev *dev = filp->private_data;
	struct mlx5_cmd_debug *dbg = &dev->cmd.dbg;
	char lbuf[3];
	int err;

	if (!dbg->in_msg || !dbg->out_msg)
		return -ENOMEM;

	if (count < sizeof(lbuf) - 1)
		return -EINVAL;

	if (copy_from_user(lbuf, buf, sizeof(lbuf) - 1))
		return -EFAULT;

	lbuf[sizeof(lbuf) - 1] = 0;

	if (strcmp(lbuf, "go"))
		return -EINVAL;

	err = mlx5_cmd_exec(dev, dbg->in_msg, dbg->inlen, dbg->out_msg, dbg->outlen);

	return err ? err : count;
}

static const struct file_operations fops = {
	.owner	= THIS_MODULE,
	.open	= simple_open,
	.write	= dbg_write,
};

static int mlx5_copy_to_msg(struct mlx5_cmd_msg *to, void *from, int size,
			    u8 token)
{
	struct mlx5_cmd_prot_block *block;
	struct mlx5_cmd_mailbox *next;
	int copy;

	if (!to || !from)
		return -ENOMEM;

	copy = min_t(int, size, sizeof(to->first.data));
	memcpy(to->first.data, from, copy);
	size -= copy;
	from += copy;

	next = to->next;
	while (size) {
		if (!next) {
			/* this is a BUG */
			return -ENOMEM;
		}

		copy = min_t(int, size, MLX5_CMD_DATA_BLOCK_SIZE);
		block = next->buf;
		memcpy(block->data, from, copy);
		from += copy;
		size -= copy;
		block->token = token;
		next = next->next;
	}

	return 0;
}

static int mlx5_copy_from_msg(void *to, struct mlx5_cmd_msg *from, int size)
{
	struct mlx5_cmd_prot_block *block;
	struct mlx5_cmd_mailbox *next;
	int copy;

	if (!to || !from)
		return -ENOMEM;

	copy = min_t(int, size, sizeof(from->first.data));
	memcpy(to, from->first.data, copy);
	size -= copy;
	to += copy;

	next = from->next;
	while (size) {
		if (!next) {
			/* this is a BUG */
			return -ENOMEM;
		}

		copy = min_t(int, size, MLX5_CMD_DATA_BLOCK_SIZE);
		block = next->buf;

		memcpy(to, block->data, copy);
		to += copy;
		size -= copy;
		next = next->next;
	}

	return 0;
}

static struct mlx5_cmd_mailbox *alloc_cmd_box(struct mlx5_core_dev *dev,
					      gfp_t flags)
{
	struct mlx5_cmd_mailbox *mailbox;

	mailbox = kmalloc(sizeof(*mailbox), flags);
	if (!mailbox)
		return ERR_PTR(-ENOMEM);

	mailbox->buf = dma_pool_zalloc(dev->cmd.pool, flags,
				       &mailbox->dma);
	if (!mailbox->buf) {
		mlx5_core_dbg(dev, "failed allocation\n");
		kfree(mailbox);
		return ERR_PTR(-ENOMEM);
	}
	mailbox->next = NULL;

	return mailbox;
}

static void free_cmd_box(struct mlx5_core_dev *dev,
			 struct mlx5_cmd_mailbox *mailbox)
{
	dma_pool_free(dev->cmd.pool, mailbox->buf, mailbox->dma);
	kfree(mailbox);
}

static struct mlx5_cmd_msg *mlx5_alloc_cmd_msg(struct mlx5_core_dev *dev,
					       gfp_t flags, int size,
					       u8 token)
{
	struct mlx5_cmd_mailbox *tmp, *head = NULL;
	struct mlx5_cmd_prot_block *block;
	struct mlx5_cmd_msg *msg;
	int err;
	int n;
	int i;

	msg = kzalloc(sizeof(*msg), flags);
	if (!msg)
		return ERR_PTR(-ENOMEM);

	msg->len = size;
	n = mlx5_calc_cmd_blocks(msg);

	for (i = 0; i < n; i++) {
		tmp = alloc_cmd_box(dev, flags);
		if (IS_ERR(tmp)) {
			mlx5_core_warn(dev, "failed allocating block\n");
			err = PTR_ERR(tmp);
			goto err_alloc;
		}

		block = tmp->buf;
		tmp->next = head;
		block->next = cpu_to_be64(tmp->next ? tmp->next->dma : 0);
		block->block_num = cpu_to_be32(n - i - 1);
		block->token = token;
		head = tmp;
	}
	msg->next = head;
	return msg;

err_alloc:
	while (head) {
		tmp = head->next;
		free_cmd_box(dev, head);
		head = tmp;
	}
	kfree(msg);

	return ERR_PTR(err);
}

static void mlx5_free_cmd_msg(struct mlx5_core_dev *dev,
			      struct mlx5_cmd_msg *msg)
{
	struct mlx5_cmd_mailbox *head = msg->next;
	struct mlx5_cmd_mailbox *next;

	while (head) {
		next = head->next;
		free_cmd_box(dev, head);
		head = next;
	}
	kfree(msg);
}

static ssize_t data_write(struct file *filp, const char __user *buf,
			  size_t count, loff_t *pos)
{
	struct mlx5_core_dev *dev = filp->private_data;
	struct mlx5_cmd_debug *dbg = &dev->cmd.dbg;
	void *ptr;

	if (*pos != 0)
		return -EINVAL;

	kfree(dbg->in_msg);
	dbg->in_msg = NULL;
	dbg->inlen = 0;
	ptr = memdup_user(buf, count);
	if (IS_ERR(ptr))
		return PTR_ERR(ptr);
	dbg->in_msg = ptr;
	dbg->inlen = count;

	*pos = count;

	return count;
}

static ssize_t data_read(struct file *filp, char __user *buf, size_t count,
			 loff_t *pos)
{
	struct mlx5_core_dev *dev = filp->private_data;
	struct mlx5_cmd_debug *dbg = &dev->cmd.dbg;

	if (!dbg->out_msg)
		return -ENOMEM;

	return simple_read_from_buffer(buf, count, pos, dbg->out_msg,
				       dbg->outlen);
}

static const struct file_operations dfops = {
	.owner	= THIS_MODULE,
	.open	= simple_open,
	.write	= data_write,
	.read	= data_read,
};

static ssize_t outlen_read(struct file *filp, char __user *buf, size_t count,
			   loff_t *pos)
{
	struct mlx5_core_dev *dev = filp->private_data;
	struct mlx5_cmd_debug *dbg = &dev->cmd.dbg;
	char outlen[8];
	int err;

	err = snprintf(outlen, sizeof(outlen), "%d", dbg->outlen);
	if (err < 0)
		return err;

	return simple_read_from_buffer(buf, count, pos, outlen, err);
}

static ssize_t outlen_write(struct file *filp, const char __user *buf,
			    size_t count, loff_t *pos)
{
	struct mlx5_core_dev *dev = filp->private_data;
	struct mlx5_cmd_debug *dbg = &dev->cmd.dbg;
	char outlen_str[8] = {0};
	int outlen;
	void *ptr;
	int err;

	if (*pos != 0 || count > 6)
		return -EINVAL;

	kfree(dbg->out_msg);
	dbg->out_msg = NULL;
	dbg->outlen = 0;

	if (copy_from_user(outlen_str, buf, count))
		return -EFAULT;

	err = sscanf(outlen_str, "%d", &outlen);
	if (err != 1)
		return -EINVAL;

	ptr = kzalloc(outlen, GFP_KERNEL);
	if (!ptr)
		return -ENOMEM;

	dbg->out_msg = ptr;
	dbg->outlen = outlen;

	*pos = count;

	return count;
}

static const struct file_operations olfops = {
	.owner	= THIS_MODULE,
	.open	= simple_open,
	.write	= outlen_write,
	.read	= outlen_read,
};

static void set_wqname(struct mlx5_core_dev *dev)
{
	struct mlx5_cmd *cmd = &dev->cmd;

	snprintf(cmd->wq_name, sizeof(cmd->wq_name), "mlx5_cmd_%s",
		 dev_name(dev->device));
}

static void clean_debug_files(struct mlx5_core_dev *dev)
{
	struct mlx5_cmd_debug *dbg = &dev->cmd.dbg;

	if (!mlx5_debugfs_root)
		return;

	debugfs_remove_recursive(dbg->dbg_root);
}

static void create_debugfs_files(struct mlx5_core_dev *dev)
{
	struct mlx5_cmd_debug *dbg = &dev->cmd.dbg;

	dbg->dbg_root = debugfs_create_dir("cmd", mlx5_debugfs_get_dev_root(dev));

	debugfs_create_file("in", 0400, dbg->dbg_root, dev, &dfops);
	debugfs_create_file("out", 0200, dbg->dbg_root, dev, &dfops);
	debugfs_create_file("out_len", 0600, dbg->dbg_root, dev, &olfops);
	debugfs_create_u8("status", 0600, dbg->dbg_root, &dbg->status);
	debugfs_create_file("run", 0200, dbg->dbg_root, dev, &fops);
}

void mlx5_cmd_allowed_opcode(struct mlx5_core_dev *dev, u16 opcode)
{
	struct mlx5_cmd *cmd = &dev->cmd;
	int i;

	for (i = 0; i < cmd->vars.max_reg_cmds; i++)
		down(&cmd->vars.sem);
	down(&cmd->vars.pages_sem);

	cmd->allowed_opcode = opcode;

	up(&cmd->vars.pages_sem);
	for (i = 0; i < cmd->vars.max_reg_cmds; i++)
		up(&cmd->vars.sem);
}

static void mlx5_cmd_change_mod(struct mlx5_core_dev *dev, int mode)
{
	struct mlx5_cmd *cmd = &dev->cmd;
	int i;

	for (i = 0; i < cmd->vars.max_reg_cmds; i++)
		down(&cmd->vars.sem);
	down(&cmd->vars.pages_sem);

	cmd->mode = mode;

	up(&cmd->vars.pages_sem);
	for (i = 0; i < cmd->vars.max_reg_cmds; i++)
		up(&cmd->vars.sem);
}

static int cmd_comp_notifier(struct notifier_block *nb,
			     unsigned long type, void *data)
{
	struct mlx5_core_dev *dev;
	struct mlx5_cmd *cmd;
	struct mlx5_eqe *eqe;

	cmd = mlx5_nb_cof(nb, struct mlx5_cmd, nb);
	dev = container_of(cmd, struct mlx5_core_dev, cmd);
	eqe = data;

	mlx5_cmd_comp_handler(dev, be32_to_cpu(eqe->data.cmd.vector), false);

	return NOTIFY_OK;
}
void mlx5_cmd_use_events(struct mlx5_core_dev *dev)
{
	MLX5_NB_INIT(&dev->cmd.nb, cmd_comp_notifier, CMD);
	mlx5_eq_notifier_register(dev, &dev->cmd.nb);
	mlx5_cmd_change_mod(dev, CMD_MODE_EVENTS);
}

void mlx5_cmd_use_polling(struct mlx5_core_dev *dev)
{
	mlx5_cmd_change_mod(dev, CMD_MODE_POLLING);
	mlx5_eq_notifier_unregister(dev, &dev->cmd.nb);
}

static void free_msg(struct mlx5_core_dev *dev, struct mlx5_cmd_msg *msg)
{
	unsigned long flags;

	if (msg->parent) {
		spin_lock_irqsave(&msg->parent->lock, flags);
		list_add_tail(&msg->list, &msg->parent->head);
		spin_unlock_irqrestore(&msg->parent->lock, flags);
	} else {
		mlx5_free_cmd_msg(dev, msg);
	}
}

static void mlx5_cmd_comp_handler(struct mlx5_core_dev *dev, u64 vec, bool forced)
{
	struct mlx5_cmd *cmd = &dev->cmd;
	struct mlx5_cmd_work_ent *ent;
	mlx5_cmd_cbk_t callback;
	void *context;
	int err;
	int i;
	s64 ds;
	struct mlx5_cmd_stats *stats;
	unsigned long flags;
	unsigned long vector;

	/* there can be at most 32 command queues */
	vector = vec & 0xffffffff;
	for (i = 0; i < (1 << cmd->vars.log_sz); i++) {
		if (test_bit(i, &vector)) {
			ent = cmd->ent_arr[i];

			/* if we already completed the command, ignore it */
			if (!test_and_clear_bit(MLX5_CMD_ENT_STATE_PENDING_COMP,
						&ent->state)) {
				/* only real completion can free the cmd slot */
				if (!forced) {
					mlx5_core_err(dev, "Command completion arrived after timeout (entry idx = %d).\n",
						      ent->idx);
					cmd_ent_put(ent);
				}
				continue;
			}

			if (ent->callback && cancel_delayed_work(&ent->cb_timeout_work))
				cmd_ent_put(ent); /* timeout work was canceled */

			if (!forced || /* Real FW completion */
			     mlx5_cmd_is_down(dev) || /* No real FW completion is expected */
			     !opcode_allowed(cmd, ent->op))
				cmd_ent_put(ent);

			ent->ts2 = ktime_get_ns();
			memcpy(ent->out->first.data, ent->lay->out, sizeof(ent->lay->out));
			dump_command(dev, ent, 0);

			if (vec & MLX5_TRIGGERED_CMD_COMP)
				ent->ret = -ENXIO;

			if (!ent->ret) { /* Command completed by FW */
				if (!cmd->checksum_disabled)
					ent->ret = verify_signature(ent);

				ent->status = ent->lay->status_own >> 1;

				mlx5_core_dbg(dev, "command completed. ret 0x%x, delivery status %s(0x%x)\n",
					      ent->ret, deliv_status_to_str(ent->status), ent->status);
			}

			if (ent->callback) {
				ds = ent->ts2 - ent->ts1;
				stats = xa_load(&cmd->stats, ent->op);
				if (stats) {
					spin_lock_irqsave(&stats->lock, flags);
					stats->sum += ds;
					++stats->n;
					spin_unlock_irqrestore(&stats->lock, flags);
				}

				callback = ent->callback;
				context = ent->context;
				err = ent->ret ? : ent->status;
				if (err > 0) /* Failed in FW, command didn't execute */
					err = deliv_status_to_err(err);

				if (!err)
					err = mlx5_copy_from_msg(ent->uout,
								 ent->out,
								 ent->uout_size);

				mlx5_free_cmd_msg(dev, ent->out);
				free_msg(dev, ent->in);

				/* final consumer is done, release ent */
				cmd_ent_put(ent);
				callback(err, context);
			} else {
				/* release wait_func() so mlx5_cmd_invoke()
				 * can make the final ent_put()
				 */
				complete(&ent->done);
			}
		}
	}
}

static void mlx5_cmd_trigger_completions(struct mlx5_core_dev *dev)
{
	struct mlx5_cmd *cmd = &dev->cmd;
	unsigned long bitmask;
	unsigned long flags;
	u64 vector;
	int i;

	/* wait for pending handlers to complete */
	mlx5_eq_synchronize_cmd_irq(dev);
	spin_lock_irqsave(&dev->cmd.alloc_lock, flags);
	vector = ~dev->cmd.vars.bitmask & ((1ul << (1 << dev->cmd.vars.log_sz)) - 1);
	if (!vector)
		goto no_trig;

	bitmask = vector;
	/* we must increment the allocated entries refcount before triggering the completions
	 * to guarantee pending commands will not get freed in the meanwhile.
	 * For that reason, it also has to be done inside the alloc_lock.
	 */
	for_each_set_bit(i, &bitmask, (1 << cmd->vars.log_sz))
		cmd_ent_get(cmd->ent_arr[i]);
	vector |= MLX5_TRIGGERED_CMD_COMP;
	spin_unlock_irqrestore(&dev->cmd.alloc_lock, flags);

	mlx5_core_dbg(dev, "vector 0x%llx\n", vector);
	mlx5_cmd_comp_handler(dev, vector, true);
	for_each_set_bit(i, &bitmask, (1 << cmd->vars.log_sz))
		cmd_ent_put(cmd->ent_arr[i]);
	return;

no_trig:
	spin_unlock_irqrestore(&dev->cmd.alloc_lock, flags);
}

void mlx5_cmd_flush(struct mlx5_core_dev *dev)
{
	struct mlx5_cmd *cmd = &dev->cmd;
	int i;

	for (i = 0; i < cmd->vars.max_reg_cmds; i++) {
		while (down_trylock(&cmd->vars.sem)) {
			mlx5_cmd_trigger_completions(dev);
			cond_resched();
		}
	}

	while (down_trylock(&cmd->vars.pages_sem)) {
		mlx5_cmd_trigger_completions(dev);
		cond_resched();
	}

	/* Unlock cmdif */
	up(&cmd->vars.pages_sem);
	for (i = 0; i < cmd->vars.max_reg_cmds; i++)
		up(&cmd->vars.sem);
}

static struct mlx5_cmd_msg *alloc_msg(struct mlx5_core_dev *dev, int in_size,
				      gfp_t gfp)
{
	struct mlx5_cmd_msg *msg = ERR_PTR(-ENOMEM);
	struct cmd_msg_cache *ch = NULL;
	struct mlx5_cmd *cmd = &dev->cmd;
	int i;

	if (in_size <= 16)
		goto cache_miss;

	for (i = 0; i < dev->profile.num_cmd_caches; i++) {
		ch = &cmd->cache[i];
		if (in_size > ch->max_inbox_size)
			continue;
		spin_lock_irq(&ch->lock);
		if (list_empty(&ch->head)) {
			spin_unlock_irq(&ch->lock);
			continue;
		}
		msg = list_entry(ch->head.next, typeof(*msg), list);
		/* For cached lists, we must explicitly state what is
		 * the real size
		 */
		msg->len = in_size;
		list_del(&msg->list);
		spin_unlock_irq(&ch->lock);
		break;
	}

	if (!IS_ERR(msg))
		return msg;

cache_miss:
	msg = mlx5_alloc_cmd_msg(dev, gfp, in_size, 0);
	return msg;
}

static int is_manage_pages(void *in)
{
	return in_to_opcode(in) == MLX5_CMD_OP_MANAGE_PAGES;
}

/*  Notes:
 *    1. Callback functions may not sleep
 *    2. Page queue commands do not support asynchrous completion
 */
static int cmd_exec(struct mlx5_core_dev *dev, void *in, int in_size, void *out,
		    int out_size, mlx5_cmd_cbk_t callback, void *context,
		    bool force_polling)
{
	struct mlx5_cmd_msg *inb, *outb;
	u16 opcode = in_to_opcode(in);
	bool throttle_op;
	int pages_queue;
	gfp_t gfp;
	u8 token;
	int err;

	if (mlx5_cmd_is_down(dev) || !opcode_allowed(&dev->cmd, opcode))
		return -ENXIO;

	throttle_op = mlx5_cmd_is_throttle_opcode(opcode);
	if (throttle_op) {
		/* atomic context may not sleep */
		if (callback)
			return -EINVAL;
		down(&dev->cmd.vars.throttle_sem);
	}

	pages_queue = is_manage_pages(in);
	gfp = callback ? GFP_ATOMIC : GFP_KERNEL;

	inb = alloc_msg(dev, in_size, gfp);
	if (IS_ERR(inb)) {
		err = PTR_ERR(inb);
		goto out_up;
	}

	token = alloc_token(&dev->cmd);

	err = mlx5_copy_to_msg(inb, in, in_size, token);
	if (err) {
		mlx5_core_warn(dev, "err %d\n", err);
		goto out_in;
	}

	outb = mlx5_alloc_cmd_msg(dev, gfp, out_size, token);
	if (IS_ERR(outb)) {
		err = PTR_ERR(outb);
		goto out_in;
	}

	err = mlx5_cmd_invoke(dev, inb, outb, out, out_size, callback, context,
			      pages_queue, token, force_polling);
	if (callback)
		return err;

	if (err > 0) /* Failed in FW, command didn't execute */
		err = deliv_status_to_err(err);

	if (err)
		goto out_out;

	/* command completed by FW */
	err = mlx5_copy_from_msg(out, outb, out_size);
out_out:
	mlx5_free_cmd_msg(dev, outb);
out_in:
	free_msg(dev, inb);
out_up:
	if (throttle_op)
		up(&dev->cmd.vars.throttle_sem);
	return err;
}

static void mlx5_cmd_err_trace(struct mlx5_core_dev *dev, u16 opcode, u16 op_mod, void *out)
{
	u32 syndrome = MLX5_GET(mbox_out, out, syndrome);
	u8 status = MLX5_GET(mbox_out, out, status);

	trace_mlx5_cmd(mlx5_command_str(opcode), opcode, op_mod,
		       cmd_status_str(status), status, syndrome,
		       cmd_status_to_err(status));
}

static void cmd_status_log(struct mlx5_core_dev *dev, u16 opcode, u8 status,
			   u32 syndrome, int err)
{
	const char *namep = mlx5_command_str(opcode);
	struct mlx5_cmd_stats *stats;
	unsigned long flags;

	if (!err || !(strcmp(namep, "unknown command opcode")))
		return;

	stats = xa_load(&dev->cmd.stats, opcode);
	if (!stats)
		return;
	spin_lock_irqsave(&stats->lock, flags);
	stats->failed++;
	if (err < 0)
		stats->last_failed_errno = -err;
	if (err == -EREMOTEIO) {
		stats->failed_mbox_status++;
		stats->last_failed_mbox_status = status;
		stats->last_failed_syndrome = syndrome;
	}
	spin_unlock_irqrestore(&stats->lock, flags);
}

/* preserve -EREMOTEIO for outbox.status != OK, otherwise return err as is */
static int cmd_status_err(struct mlx5_core_dev *dev, int err, u16 opcode, u16 op_mod, void *out)
{
	u32 syndrome = MLX5_GET(mbox_out, out, syndrome);
	u8 status = MLX5_GET(mbox_out, out, status);

	if (err == -EREMOTEIO) /* -EREMOTEIO is preserved */
		err = -EIO;

	if (!err && status != MLX5_CMD_STAT_OK) {
		err = -EREMOTEIO;
		mlx5_cmd_err_trace(dev, opcode, op_mod, out);
	}

	cmd_status_log(dev, opcode, status, syndrome, err);
	return err;
}

/**
 * mlx5_cmd_do - Executes a fw command, wait for completion.
 * Unlike mlx5_cmd_exec, this function will not translate or intercept
 * outbox.status and will return -EREMOTEIO when
 * outbox.status != MLX5_CMD_STAT_OK
 *
 * @dev: mlx5 core device
 * @in: inbox mlx5_ifc command buffer
 * @in_size: inbox buffer size
 * @out: outbox mlx5_ifc buffer
 * @out_size: outbox size
 *
 * @return:
 * -EREMOTEIO : Command executed by FW, outbox.status != MLX5_CMD_STAT_OK.
 *              Caller must check FW outbox status.
 *   0 : Command execution successful, outbox.status == MLX5_CMD_STAT_OK.
 * < 0 : Command execution couldn't be performed by firmware or driver
 */
int mlx5_cmd_do(struct mlx5_core_dev *dev, void *in, int in_size, void *out, int out_size)
{
	int err = cmd_exec(dev, in, in_size, out, out_size, NULL, NULL, false);
	u16 op_mod = MLX5_GET(mbox_in, in, op_mod);
	u16 opcode = in_to_opcode(in);

	return cmd_status_err(dev, err, opcode, op_mod, out);
}
EXPORT_SYMBOL(mlx5_cmd_do);

/**
 * mlx5_cmd_exec - Executes a fw command, wait for completion
 *
 * @dev: mlx5 core device
 * @in: inbox mlx5_ifc command buffer
 * @in_size: inbox buffer size
 * @out: outbox mlx5_ifc buffer
 * @out_size: outbox size
 *
 * @return: 0 if no error, FW command execution was successful
 *          and outbox status is ok.
 */
int mlx5_cmd_exec(struct mlx5_core_dev *dev, void *in, int in_size, void *out,
		  int out_size)
{
	int err = mlx5_cmd_do(dev, in, in_size, out, out_size);

	return mlx5_cmd_check(dev, err, in, out);
}
EXPORT_SYMBOL(mlx5_cmd_exec);

/**
 * mlx5_cmd_exec_polling - Executes a fw command, poll for completion
 *	Needed for driver force teardown, when command completion EQ
 *	will not be available to complete the command
 *
 * @dev: mlx5 core device
 * @in: inbox mlx5_ifc command buffer
 * @in_size: inbox buffer size
 * @out: outbox mlx5_ifc buffer
 * @out_size: outbox size
 *
 * @return: 0 if no error, FW command execution was successful
 *          and outbox status is ok.
 */
int mlx5_cmd_exec_polling(struct mlx5_core_dev *dev, void *in, int in_size,
			  void *out, int out_size)
{
	int err = cmd_exec(dev, in, in_size, out, out_size, NULL, NULL, true);
	u16 op_mod = MLX5_GET(mbox_in, in, op_mod);
	u16 opcode = in_to_opcode(in);

	err = cmd_status_err(dev, err, opcode, op_mod, out);
	return mlx5_cmd_check(dev, err, in, out);
}
EXPORT_SYMBOL(mlx5_cmd_exec_polling);

void mlx5_cmd_init_async_ctx(struct mlx5_core_dev *dev,
			     struct mlx5_async_ctx *ctx)
{
	ctx->dev = dev;
	/* Starts at 1 to avoid doing wake_up if we are not cleaning up */
	atomic_set(&ctx->num_inflight, 1);
	init_completion(&ctx->inflight_done);
}
EXPORT_SYMBOL(mlx5_cmd_init_async_ctx);

/**
 * mlx5_cmd_cleanup_async_ctx - Clean up an async_ctx
 * @ctx: The ctx to clean
 *
 * Upon return all callbacks given to mlx5_cmd_exec_cb() have been called. The
 * caller must ensure that mlx5_cmd_exec_cb() is not called during or after
 * the call mlx5_cleanup_async_ctx().
 */
void mlx5_cmd_cleanup_async_ctx(struct mlx5_async_ctx *ctx)
{
	if (!atomic_dec_and_test(&ctx->num_inflight))
		wait_for_completion(&ctx->inflight_done);
}
EXPORT_SYMBOL(mlx5_cmd_cleanup_async_ctx);

static void mlx5_cmd_exec_cb_handler(int status, void *_work)
{
	struct mlx5_async_work *work = _work;
	struct mlx5_async_ctx *ctx;

	ctx = work->ctx;
	status = cmd_status_err(ctx->dev, status, work->opcode, work->op_mod, work->out);
	work->user_callback(status, work);
	if (atomic_dec_and_test(&ctx->num_inflight))
		complete(&ctx->inflight_done);
}

int mlx5_cmd_exec_cb(struct mlx5_async_ctx *ctx, void *in, int in_size,
		     void *out, int out_size, mlx5_async_cbk_t callback,
		     struct mlx5_async_work *work)
{
	int ret;

	work->ctx = ctx;
	work->user_callback = callback;
	work->opcode = in_to_opcode(in);
	work->op_mod = MLX5_GET(mbox_in, in, op_mod);
	work->out = out;
	if (WARN_ON(!atomic_inc_not_zero(&ctx->num_inflight)))
		return -EIO;
	ret = cmd_exec(ctx->dev, in, in_size, out, out_size,
		       mlx5_cmd_exec_cb_handler, work, false);
	if (ret && atomic_dec_and_test(&ctx->num_inflight))
		complete(&ctx->inflight_done);

	return ret;
}
EXPORT_SYMBOL(mlx5_cmd_exec_cb);

int mlx5_cmd_allow_other_vhca_access(struct mlx5_core_dev *dev,
				     struct mlx5_cmd_allow_other_vhca_access_attr *attr)
{
	u32 out[MLX5_ST_SZ_DW(allow_other_vhca_access_out)] = {};
	u32 in[MLX5_ST_SZ_DW(allow_other_vhca_access_in)] = {};
	void *key;

	MLX5_SET(allow_other_vhca_access_in,
		 in, opcode, MLX5_CMD_OP_ALLOW_OTHER_VHCA_ACCESS);
	MLX5_SET(allow_other_vhca_access_in,
		 in, object_type_to_be_accessed, attr->obj_type);
	MLX5_SET(allow_other_vhca_access_in,
		 in, object_id_to_be_accessed, attr->obj_id);

	key = MLX5_ADDR_OF(allow_other_vhca_access_in, in, access_key);
	memcpy(key, attr->access_key, sizeof(attr->access_key));

	return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}

int mlx5_cmd_alias_obj_create(struct mlx5_core_dev *dev,
			      struct mlx5_cmd_alias_obj_create_attr *alias_attr,
			      u32 *obj_id)
{
	u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)] = {};
	u32 in[MLX5_ST_SZ_DW(create_alias_obj_in)] = {};
	void *param;
	void *attr;
	void *key;
	int ret;

	attr = MLX5_ADDR_OF(create_alias_obj_in, in, hdr);
	MLX5_SET(general_obj_in_cmd_hdr,
		 attr, opcode, MLX5_CMD_OP_CREATE_GENERAL_OBJECT);
	MLX5_SET(general_obj_in_cmd_hdr,
		 attr, obj_type, alias_attr->obj_type);
	param = MLX5_ADDR_OF(general_obj_in_cmd_hdr, in, op_param);
	MLX5_SET(general_obj_create_param, param, alias_object, 1);

	attr = MLX5_ADDR_OF(create_alias_obj_in, in, alias_ctx);
	MLX5_SET(alias_context, attr, vhca_id_to_be_accessed, alias_attr->vhca_id);
	MLX5_SET(alias_context, attr, object_id_to_be_accessed, alias_attr->obj_id);

	key = MLX5_ADDR_OF(alias_context, attr, access_key);
	memcpy(key, alias_attr->access_key, sizeof(alias_attr->access_key));

	ret = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
	if (ret)
		return ret;

	*obj_id = MLX5_GET(general_obj_out_cmd_hdr, out, obj_id);

	return 0;
}

int mlx5_cmd_alias_obj_destroy(struct mlx5_core_dev *dev, u32 obj_id,
			       u16 obj_type)
{
	u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)] = {};
	u32 in[MLX5_ST_SZ_DW(general_obj_in_cmd_hdr)] = {};

	MLX5_SET(general_obj_in_cmd_hdr, in, opcode, MLX5_CMD_OP_DESTROY_GENERAL_OBJECT);
	MLX5_SET(general_obj_in_cmd_hdr, in, obj_type, obj_type);
	MLX5_SET(general_obj_in_cmd_hdr, in, obj_id, obj_id);

	return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}

static void destroy_msg_cache(struct mlx5_core_dev *dev)
{
	struct cmd_msg_cache *ch;
	struct mlx5_cmd_msg *msg;
	struct mlx5_cmd_msg *n;
	int i;

	for (i = 0; i < dev->profile.num_cmd_caches; i++) {
		ch = &dev->cmd.cache[i];
		list_for_each_entry_safe(msg, n, &ch->head, list) {
			list_del(&msg->list);
			mlx5_free_cmd_msg(dev, msg);
		}
	}
}

static unsigned cmd_cache_num_ent[MLX5_NUM_COMMAND_CACHES] = {
	512, 32, 16, 8, 2
};

static unsigned cmd_cache_ent_size[MLX5_NUM_COMMAND_CACHES] = {
	16 + MLX5_CMD_DATA_BLOCK_SIZE,
	16 + MLX5_CMD_DATA_BLOCK_SIZE * 2,
	16 + MLX5_CMD_DATA_BLOCK_SIZE * 16,
	16 + MLX5_CMD_DATA_BLOCK_SIZE * 256,
	16 + MLX5_CMD_DATA_BLOCK_SIZE * 512,
};

static void create_msg_cache(struct mlx5_core_dev *dev)
{
	struct mlx5_cmd *cmd = &dev->cmd;
	struct cmd_msg_cache *ch;
	struct mlx5_cmd_msg *msg;
	int i;
	int k;

	/* Initialize and fill the caches with initial entries */
	for (k = 0; k < dev->profile.num_cmd_caches; k++) {
		ch = &cmd->cache[k];
		spin_lock_init(&ch->lock);
		INIT_LIST_HEAD(&ch->head);
		ch->num_ent = cmd_cache_num_ent[k];
		ch->max_inbox_size = cmd_cache_ent_size[k];
		for (i = 0; i < ch->num_ent; i++) {
			msg = mlx5_alloc_cmd_msg(dev, GFP_KERNEL | __GFP_NOWARN,
						 ch->max_inbox_size, 0);
			if (IS_ERR(msg))
				break;
			msg->parent = ch;
			list_add_tail(&msg->list, &ch->head);
		}
	}
}

static int alloc_cmd_page(struct mlx5_core_dev *dev, struct mlx5_cmd *cmd)
{
	cmd->cmd_alloc_buf = dma_alloc_coherent(mlx5_core_dma_dev(dev), MLX5_ADAPTER_PAGE_SIZE,
						&cmd->alloc_dma, GFP_KERNEL);
	if (!cmd->cmd_alloc_buf)
		return -ENOMEM;

	/* make sure it is aligned to 4K */
	if (!((uintptr_t)cmd->cmd_alloc_buf & (MLX5_ADAPTER_PAGE_SIZE - 1))) {
		cmd->cmd_buf = cmd->cmd_alloc_buf;
		cmd->dma = cmd->alloc_dma;
		cmd->alloc_size = MLX5_ADAPTER_PAGE_SIZE;
		return 0;
	}

	dma_free_coherent(mlx5_core_dma_dev(dev), MLX5_ADAPTER_PAGE_SIZE, cmd->cmd_alloc_buf,
			  cmd->alloc_dma);
	cmd->cmd_alloc_buf = dma_alloc_coherent(mlx5_core_dma_dev(dev),
						2 * MLX5_ADAPTER_PAGE_SIZE - 1,
						&cmd->alloc_dma, GFP_KERNEL);
	if (!cmd->cmd_alloc_buf)
		return -ENOMEM;

	cmd->cmd_buf = PTR_ALIGN(cmd->cmd_alloc_buf, MLX5_ADAPTER_PAGE_SIZE);
	cmd->dma = ALIGN(cmd->alloc_dma, MLX5_ADAPTER_PAGE_SIZE);
	cmd->alloc_size = 2 * MLX5_ADAPTER_PAGE_SIZE - 1;
	return 0;
}

static void free_cmd_page(struct mlx5_core_dev *dev, struct mlx5_cmd *cmd)
{
	dma_free_coherent(mlx5_core_dma_dev(dev), cmd->alloc_size, cmd->cmd_alloc_buf,
			  cmd->alloc_dma);
}

static u16 cmdif_rev(struct mlx5_core_dev *dev)
{
	return ioread32be(&dev->iseg->cmdif_rev_fw_sub) >> 16;
}

int mlx5_cmd_init(struct mlx5_core_dev *dev)
{
	struct mlx5_cmd *cmd = &dev->cmd;

	cmd->checksum_disabled = 1;

	spin_lock_init(&cmd->alloc_lock);
	spin_lock_init(&cmd->token_lock);

	set_wqname(dev);
	cmd->wq = create_singlethread_workqueue(cmd->wq_name);
	if (!cmd->wq) {
		mlx5_core_err(dev, "failed to create command workqueue\n");
		return -ENOMEM;
	}

	mlx5_cmdif_debugfs_init(dev);

	return 0;
}

void mlx5_cmd_cleanup(struct mlx5_core_dev *dev)
{
	struct mlx5_cmd *cmd = &dev->cmd;

	mlx5_cmdif_debugfs_cleanup(dev);
	destroy_workqueue(cmd->wq);
}

int mlx5_cmd_enable(struct mlx5_core_dev *dev)
{
	int size = sizeof(struct mlx5_cmd_prot_block);
	int align = roundup_pow_of_two(size);
	struct mlx5_cmd *cmd = &dev->cmd;
	u32 cmd_h, cmd_l;
	int err;

	memset(&cmd->vars, 0, sizeof(cmd->vars));
	cmd->vars.cmdif_rev = cmdif_rev(dev);
	if (cmd->vars.cmdif_rev != CMD_IF_REV) {
		mlx5_core_err(dev,
			      "Driver cmdif rev(%d) differs from firmware's(%d)\n",
			      CMD_IF_REV, cmd->vars.cmdif_rev);
		return -EINVAL;
	}

	cmd_l = ioread32be(&dev->iseg->cmdq_addr_l_sz) & 0xff;
	cmd->vars.log_sz = cmd_l >> 4 & 0xf;
	cmd->vars.log_stride = cmd_l & 0xf;
	if (1 << cmd->vars.log_sz > MLX5_MAX_COMMANDS) {
		mlx5_core_err(dev, "firmware reports too many outstanding commands %d\n",
			      1 << cmd->vars.log_sz);
		return -EINVAL;
	}

	if (cmd->vars.log_sz + cmd->vars.log_stride > MLX5_ADAPTER_PAGE_SHIFT) {
		mlx5_core_err(dev, "command queue size overflow\n");
		return -EINVAL;
	}

	cmd->state = MLX5_CMDIF_STATE_DOWN;
	cmd->vars.max_reg_cmds = (1 << cmd->vars.log_sz) - 1;
	cmd->vars.bitmask = (1UL << cmd->vars.max_reg_cmds) - 1;

	sema_init(&cmd->vars.sem, cmd->vars.max_reg_cmds);
	sema_init(&cmd->vars.pages_sem, 1);
	sema_init(&cmd->vars.throttle_sem, DIV_ROUND_UP(cmd->vars.max_reg_cmds, 2));

	cmd->pool = dma_pool_create("mlx5_cmd", mlx5_core_dma_dev(dev), size, align, 0);
	if (!cmd->pool)
		return -ENOMEM;

	err = alloc_cmd_page(dev, cmd);
	if (err)
		goto err_free_pool;

	cmd_h = (u32)((u64)(cmd->dma) >> 32);
	cmd_l = (u32)(cmd->dma);
	if (cmd_l & 0xfff) {
		mlx5_core_err(dev, "invalid command queue address\n");
		err = -ENOMEM;
		goto err_cmd_page;
	}

	iowrite32be(cmd_h, &dev->iseg->cmdq_addr_h);
	iowrite32be(cmd_l, &dev->iseg->cmdq_addr_l_sz);

	/* Make sure firmware sees the complete address before we proceed */
	wmb();

	mlx5_core_dbg(dev, "descriptor at dma 0x%llx\n", (unsigned long long)(cmd->dma));

	cmd->mode = CMD_MODE_POLLING;
	cmd->allowed_opcode = CMD_ALLOWED_OPCODE_ALL;

	create_msg_cache(dev);
	create_debugfs_files(dev);

	return 0;

err_cmd_page:
	free_cmd_page(dev, cmd);
err_free_pool:
	dma_pool_destroy(cmd->pool);
	return err;
}

void mlx5_cmd_disable(struct mlx5_core_dev *dev)
{
	struct mlx5_cmd *cmd = &dev->cmd;

	flush_workqueue(cmd->wq);
	clean_debug_files(dev);
	destroy_msg_cache(dev);
	free_cmd_page(dev, cmd);
	dma_pool_destroy(cmd->pool);
}

void mlx5_cmd_set_state(struct mlx5_core_dev *dev,
			enum mlx5_cmdif_state cmdif_state)
{
	dev->cmd.state = cmdif_state;
}