// SPDX-License-Identifier: GPL-2.0
#include <linux/cpumask.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci_regs.h>
#include <linux/vmalloc.h>
#include <linux/pci.h>

#include "nitrox_dev.h"
#include "nitrox_common.h"
#include "nitrox_req.h"
#include "nitrox_csr.h"

#define CRYPTO_CTX_SIZE 256

/* packet inuput ring alignments */
#define PKTIN_Q_ALIGN_BYTES 16

static int nitrox_cmdq_init(struct nitrox_cmdq *cmdq, int align_bytes)
{
        struct nitrox_device *ndev = cmdq->ndev;

        cmdq->qsize = (ndev->qlen * cmdq->instr_size) + align_bytes;
        cmdq->unalign_base = dma_alloc_coherent(DEV(ndev), cmdq->qsize,
                                                &cmdq->unalign_dma,
                                                GFP_KERNEL);
        if (!cmdq->unalign_base)
                return -ENOMEM;

        cmdq->dma = PTR_ALIGN(cmdq->unalign_dma, align_bytes);
        cmdq->base = cmdq->unalign_base + (cmdq->dma - cmdq->unalign_dma);
        cmdq->write_idx = 0;

        spin_lock_init(&cmdq->cmd_qlock);
        spin_lock_init(&cmdq->resp_qlock);
        spin_lock_init(&cmdq->backlog_qlock);

        INIT_LIST_HEAD(&cmdq->response_head);
        INIT_LIST_HEAD(&cmdq->backlog_head);
        INIT_WORK(&cmdq->backlog_qflush, backlog_qflush_work);

        atomic_set(&cmdq->pending_count, 0);
        atomic_set(&cmdq->backlog_count, 0);
        return 0;
}

static void nitrox_cmdq_reset(struct nitrox_cmdq *cmdq)
{
        cmdq->write_idx = 0;
        atomic_set(&cmdq->pending_count, 0);
        atomic_set(&cmdq->backlog_count, 0);
}

static void nitrox_cmdq_cleanup(struct nitrox_cmdq *cmdq)
{
        struct nitrox_device *ndev = cmdq->ndev;

        if (!cmdq->unalign_base)
                return;

        cancel_work_sync(&cmdq->backlog_qflush);

        dma_free_coherent(DEV(ndev), cmdq->qsize,
                          cmdq->unalign_base, cmdq->unalign_dma);
        nitrox_cmdq_reset(cmdq);

        cmdq->dbell_csr_addr = NULL;
        cmdq->compl_cnt_csr_addr = NULL;
        cmdq->unalign_base = NULL;
        cmdq->base = NULL;
        cmdq->unalign_dma = 0;
        cmdq->dma = 0;
        cmdq->qsize = 0;
        cmdq->instr_size = 0;
}

static void nitrox_free_pktin_queues(struct nitrox_device *ndev)
{
        int i;

        for (i = 0; i < ndev->nr_queues; i++) {
                struct nitrox_cmdq *cmdq = &ndev->pkt_inq[i];

                nitrox_cmdq_cleanup(cmdq);
        }
        kfree(ndev->pkt_inq);
        ndev->pkt_inq = NULL;
}

static int nitrox_alloc_pktin_queues(struct nitrox_device *ndev)
{
        int i, err;

        ndev->pkt_inq = kcalloc_node(ndev->nr_queues,
                                     sizeof(struct nitrox_cmdq),
                                     GFP_KERNEL, ndev->node);
        if (!ndev->pkt_inq)
                return -ENOMEM;

        for (i = 0; i < ndev->nr_queues; i++) {
                struct nitrox_cmdq *cmdq;
                u64 offset;

                cmdq = &ndev->pkt_inq[i];
                cmdq->ndev = ndev;
                cmdq->qno = i;
                cmdq->instr_size = sizeof(struct nps_pkt_instr);

                /* packet input ring doorbell address */
                offset = NPS_PKT_IN_INSTR_BAOFF_DBELLX(i);
                cmdq->dbell_csr_addr = NITROX_CSR_ADDR(ndev, offset);
                /* packet solicit port completion count address */
                offset = NPS_PKT_SLC_CNTSX(i);
                cmdq->compl_cnt_csr_addr = NITROX_CSR_ADDR(ndev, offset);

                err = nitrox_cmdq_init(cmdq, PKTIN_Q_ALIGN_BYTES);
                if (err)
                        goto pktq_fail;
        }
        return 0;

pktq_fail:
        nitrox_free_pktin_queues(ndev);
        return err;
}

static int create_crypto_dma_pool(struct nitrox_device *ndev)
{
        size_t size;

        /* Crypto context pool, 16 byte aligned */
        size = CRYPTO_CTX_SIZE + sizeof(struct ctx_hdr);
        ndev->ctx_pool = dma_pool_create("nitrox-context",
                                         DEV(ndev), size, 16, 0);
        if (!ndev->ctx_pool)
                return -ENOMEM;

        return 0;
}

static void destroy_crypto_dma_pool(struct nitrox_device *ndev)
{
        if (!ndev->ctx_pool)
                return;

        dma_pool_destroy(ndev->ctx_pool);
        ndev->ctx_pool = NULL;
}

/*
 * crypto_alloc_context - Allocate crypto context from pool
 * @ndev: NITROX Device
 */
void *crypto_alloc_context(struct nitrox_device *ndev)
{
        struct ctx_hdr *ctx;
        struct crypto_ctx_hdr *chdr;
        void *vaddr;
        dma_addr_t dma;

        chdr = kmalloc(sizeof(*chdr), GFP_KERNEL);
        if (!chdr)
                return NULL;

        vaddr = dma_pool_zalloc(ndev->ctx_pool, GFP_KERNEL, &dma);
        if (!vaddr) {
                kfree(chdr);
                return NULL;
        }

        /* fill meta data */
        ctx = vaddr;
        ctx->pool = ndev->ctx_pool;
        ctx->dma = dma;
        ctx->ctx_dma = dma + sizeof(struct ctx_hdr);

        chdr->pool = ndev->ctx_pool;
        chdr->dma = dma;
        chdr->vaddr = vaddr;

        return chdr;
}

/**
 * crypto_free_context - Free crypto context to pool
 * @ctx: context to free
 */
void crypto_free_context(void *ctx)
{
        struct crypto_ctx_hdr *ctxp;

        if (!ctx)
                return;

        ctxp = ctx;
        dma_pool_free(ctxp->pool, ctxp->vaddr, ctxp->dma);
        kfree(ctxp);
}

/**
 * nitrox_common_sw_init - allocate software resources.
 * @ndev: NITROX device
 *
 * Allocates crypto context pools and command queues etc.
 *
 * Return: 0 on success, or a negative error code on error.
 */
int nitrox_common_sw_init(struct nitrox_device *ndev)
{
        int err = 0;

        /* per device crypto context pool */
        err = create_crypto_dma_pool(ndev);
        if (err)
                return err;

        err = nitrox_alloc_pktin_queues(ndev);
        if (err)
                destroy_crypto_dma_pool(ndev);

        return err;
}

/**
 * nitrox_common_sw_cleanup - free software resources.
 * @ndev: NITROX device
 */
void nitrox_common_sw_cleanup(struct nitrox_device *ndev)
{
        nitrox_free_pktin_queues(ndev);
        destroy_crypto_dma_pool(ndev);
}