drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h

/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/* Copyright (c) 2018-2021, Mellanox Technologies inc.  All rights reserved. */

#ifndef __LIB_MLX5_EQ_H__
#define __LIB_MLX5_EQ_H__
#include <linux/mlx5/driver.h>
#include <linux/mlx5/eq.h>
#include <linux/mlx5/cq.h>

#define MLX5_EQE_SIZE       (sizeof(struct mlx5_eqe))

struct mlx5_eq_tasklet {
	struct list_head      list;
	struct list_head      process_list;
	struct tasklet_struct task;
	spinlock_t            lock; /* lock completion tasklet list */
};

struct mlx5_cq_table {
	spinlock_t              lock;	/* protect radix tree */
	struct radix_tree_root  tree;
};

struct mlx5_eq {
	struct mlx5_frag_buf_ctrl fbc;
	struct mlx5_frag_buf    frag_buf;
	struct mlx5_core_dev    *dev;
	struct mlx5_cq_table    cq_table;
	__be32 __iomem	        *doorbell;
	u32                     cons_index;
	unsigned int            vecidx;
	unsigned int            irqn;
	u8                      eqn;
	struct mlx5_rsc_debug   *dbg;
	struct mlx5_irq         *irq;
};

struct mlx5_eq_async {
	struct mlx5_eq          core;
	struct notifier_block   irq_nb;
	spinlock_t              lock; /* To avoid irq EQ handle races with resiliency flows */
};

struct mlx5_eq_comp {
	struct mlx5_eq          core;
	struct notifier_block   irq_nb;
	struct mlx5_eq_tasklet  tasklet_ctx;
	struct list_head        list;
};

static inline u32 eq_get_size(struct mlx5_eq *eq)
{
	return eq->fbc.sz_m1 + 1;
}

static inline struct mlx5_eqe *get_eqe(struct mlx5_eq *eq, u32 entry)
{
	return mlx5_frag_buf_get_wqe(&eq->fbc, entry);
}

static inline struct mlx5_eqe *next_eqe_sw(struct mlx5_eq *eq)
{
	struct mlx5_eqe *eqe = get_eqe(eq, eq->cons_index & eq->fbc.sz_m1);

	return (eqe->owner ^ (eq->cons_index >> eq->fbc.log_sz)) & 1 ? NULL : eqe;
}

static inline void eq_update_ci(struct mlx5_eq *eq, int arm)
{
	__be32 __iomem *addr = eq->doorbell + (arm ? 0 : 2);
	u32 val = (eq->cons_index & 0xffffff) | (eq->eqn << 24);

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

int mlx5_eq_table_init(struct mlx5_core_dev *dev);
void mlx5_eq_table_cleanup(struct mlx5_core_dev *dev);
int mlx5_eq_table_create(struct mlx5_core_dev *dev);
void mlx5_eq_table_destroy(struct mlx5_core_dev *dev);

int mlx5_eq_add_cq(struct mlx5_eq *eq, struct mlx5_core_cq *cq);
void mlx5_eq_del_cq(struct mlx5_eq *eq, struct mlx5_core_cq *cq);
struct mlx5_eq_comp *mlx5_eqn2comp_eq(struct mlx5_core_dev *dev, int eqn);
struct mlx5_eq *mlx5_get_async_eq(struct mlx5_core_dev *dev);
void mlx5_cq_tasklet_cb(struct tasklet_struct *t);
struct cpumask *mlx5_eq_comp_cpumask(struct mlx5_core_dev *dev, int ix);

u32 mlx5_eq_poll_irq_disabled(struct mlx5_eq_comp *eq);
void mlx5_cmd_eq_recover(struct mlx5_core_dev *dev);
void mlx5_eq_synchronize_async_irq(struct mlx5_core_dev *dev);
void mlx5_eq_synchronize_cmd_irq(struct mlx5_core_dev *dev);

int mlx5_debug_eq_add(struct mlx5_core_dev *dev, struct mlx5_eq *eq);
void mlx5_debug_eq_remove(struct mlx5_core_dev *dev, struct mlx5_eq *eq);
void mlx5_eq_debugfs_init(struct mlx5_core_dev *dev);
void mlx5_eq_debugfs_cleanup(struct mlx5_core_dev *dev);

/* This function should only be called after mlx5_cmd_force_teardown_hca */
void mlx5_core_eq_free_irqs(struct mlx5_core_dev *dev);

#ifdef CONFIG_RFS_ACCEL
struct cpu_rmap *mlx5_eq_table_get_rmap(struct mlx5_core_dev *dev);
#endif

int mlx5_vector2irqn(struct mlx5_core_dev *dev, int vector, unsigned int *irqn);

#endif