/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Huawei HiNIC PCI Express Linux driver
 * Copyright(c) 2017 Huawei Technologies Co., Ltd
 */

#ifndef HINIC_HW_WQ_H
#define HINIC_HW_WQ_H

#include <linux/types.h>
#include <linux/semaphore.h>
#include <linux/atomic.h>

#include "hinic_hw_if.h"
#include "hinic_hw_wqe.h"

struct hinic_free_block {
        int     page_idx;
        int     block_idx;
};

struct hinic_wq {
        struct hinic_hwif       *hwif;

        int             page_idx;
        int             block_idx;

        u16             wqebb_size;
        u32             wq_page_size;
        u16             q_depth;
        u16             max_wqe_size;
        u16             num_wqebbs_per_page;
        u16             wqebbs_per_page_shift;
        u16             wqebb_size_shift;
        /* The addresses are 64 bit in the HW */
        u64             block_paddr;
        void            **shadow_block_vaddr;
        u64             *block_vaddr;

        int             num_q_pages;
        u8              *shadow_wqe;
        u16             *shadow_idx;

        atomic_t        cons_idx;
        atomic_t        prod_idx;
        atomic_t        delta;
        u16             mask;
};

struct hinic_wqs {
        struct hinic_hwif       *hwif;
        int                     num_pages;

        /* The addresses are 64 bit in the HW */
        u64                     *page_paddr;
        u64                     **page_vaddr;
        void                    ***shadow_page_vaddr;

        struct hinic_free_block *free_blocks;
        int                     alloc_blk_pos;
        int                     return_blk_pos;
        int                     num_free_blks;

        /* Lock for getting a free block from the WQ set */
        struct semaphore        alloc_blocks_lock;
};

struct hinic_cmdq_pages {
        /* The addresses are 64 bit in the HW */
        u64                     page_paddr;
        u64                     *page_vaddr;
        void                    **shadow_page_vaddr;

        struct hinic_hwif       *hwif;
};

int hinic_wqs_cmdq_alloc(struct hinic_cmdq_pages *cmdq_pages,
                         struct hinic_wq *wq, struct hinic_hwif *hwif,
                         int cmdq_blocks, u16 wqebb_size, u32 wq_page_size,
                         u16 q_depth, u16 max_wqe_size);

void hinic_wqs_cmdq_free(struct hinic_cmdq_pages *cmdq_pages,
                         struct hinic_wq *wq, int cmdq_blocks);

int hinic_wqs_alloc(struct hinic_wqs *wqs, int num_wqs,
                    struct hinic_hwif *hwif);

void hinic_wqs_free(struct hinic_wqs *wqs);

int hinic_wq_allocate(struct hinic_wqs *wqs, struct hinic_wq *wq,
                      u16 wqebb_size, u32 wq_page_size, u16 q_depth,
                      u16 max_wqe_size);

void hinic_wq_free(struct hinic_wqs *wqs, struct hinic_wq *wq);

struct hinic_hw_wqe *hinic_get_wqe(struct hinic_wq *wq, unsigned int wqe_size,
                                   u16 *prod_idx);

void hinic_return_wqe(struct hinic_wq *wq, unsigned int wqe_size);

void hinic_put_wqe(struct hinic_wq *wq, unsigned int wqe_size);

struct hinic_hw_wqe *hinic_read_wqe(struct hinic_wq *wq, unsigned int wqe_size,
                                    u16 *cons_idx);

struct hinic_hw_wqe *hinic_read_wqe_direct(struct hinic_wq *wq, u16 cons_idx);

void hinic_write_wqe(struct hinic_wq *wq, struct hinic_hw_wqe *wqe,
                     unsigned int wqe_size);

#endif