// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2005 - 2016 Broadcom
 * All rights reserved.
 *
 * Contact Information:
 * linux-drivers@emulex.com
 *
 * Emulex
 * 3333 Susan Street
 * Costa Mesa, CA 92626
 */

#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/module.h>

#include "be.h"
#include "be_cmds.h"

static struct ocrdma_driver *ocrdma_drv;
static LIST_HEAD(be_adapter_list);
static DEFINE_MUTEX(be_adapter_list_lock);

static void _be_roce_dev_add(struct be_adapter *adapter)
{
        struct be_dev_info dev_info;
        int i, num_vec;
        struct pci_dev *pdev = adapter->pdev;

        if (!ocrdma_drv)
                return;

        if (ocrdma_drv->be_abi_version != BE_ROCE_ABI_VERSION) {
                dev_warn(&pdev->dev, "Cannot initialize RoCE due to ocrdma ABI mismatch\n");
                return;
        }

        if (pdev->device == OC_DEVICE_ID5) {
                /* only msix is supported on these devices */
                if (!msix_enabled(adapter))
                        return;
                /* DPP region address and length */
                dev_info.dpp_unmapped_addr = pci_resource_start(pdev, 2);
                dev_info.dpp_unmapped_len = pci_resource_len(pdev, 2);
        } else {
                dev_info.dpp_unmapped_addr = 0;
                dev_info.dpp_unmapped_len = 0;
        }
        dev_info.pdev = adapter->pdev;
        dev_info.db = adapter->db;
        dev_info.unmapped_db = adapter->roce_db.io_addr;
        dev_info.db_page_size = adapter->roce_db.size;
        dev_info.db_total_size = adapter->roce_db.total_size;
        dev_info.netdev = adapter->netdev;
        memcpy(dev_info.mac_addr, adapter->netdev->dev_addr, ETH_ALEN);
        dev_info.dev_family = adapter->sli_family;
        if (msix_enabled(adapter)) {
                /* provide all the vectors, so that EQ creation response
                 * can decide which one to use.
                 */
                num_vec = adapter->num_msix_vec + adapter->num_msix_roce_vec;
                dev_info.intr_mode = BE_INTERRUPT_MODE_MSIX;
                dev_info.msix.num_vectors = min(num_vec, MAX_MSIX_VECTORS);
                /* provide start index of the vector,
                 * so in case of linear usage,
                 * it can use the base as starting point.
                 */
                dev_info.msix.start_vector = adapter->num_evt_qs;
                for (i = 0; i < dev_info.msix.num_vectors; i++) {
                        dev_info.msix.vector_list[i] =
                            adapter->msix_entries[i].vector;
                }
        } else {
                dev_info.msix.num_vectors = 0;
                dev_info.intr_mode = BE_INTERRUPT_MODE_INTX;
        }
        adapter->ocrdma_dev = ocrdma_drv->add(&dev_info);
}

void be_roce_dev_add(struct be_adapter *adapter)
{
        if (be_roce_supported(adapter)) {
                INIT_LIST_HEAD(&adapter->entry);
                mutex_lock(&be_adapter_list_lock);
                list_add_tail(&adapter->entry, &be_adapter_list);

                /* invoke add() routine of roce driver only if
                 * valid driver registered with add method and add() is not yet
                 * invoked on a given adapter.
                 */
                _be_roce_dev_add(adapter);
                mutex_unlock(&be_adapter_list_lock);
        }
}

static void _be_roce_dev_remove(struct be_adapter *adapter)
{
        if (ocrdma_drv && ocrdma_drv->remove && adapter->ocrdma_dev)
                ocrdma_drv->remove(adapter->ocrdma_dev);
        adapter->ocrdma_dev = NULL;
}

void be_roce_dev_remove(struct be_adapter *adapter)
{
        if (be_roce_supported(adapter)) {
                mutex_lock(&be_adapter_list_lock);
                _be_roce_dev_remove(adapter);
                list_del(&adapter->entry);
                mutex_unlock(&be_adapter_list_lock);
        }
}

void be_roce_dev_shutdown(struct be_adapter *adapter)
{
        if (be_roce_supported(adapter)) {
                mutex_lock(&be_adapter_list_lock);
                if (ocrdma_drv && adapter->ocrdma_dev &&
                    ocrdma_drv->state_change_handler)
                        ocrdma_drv->state_change_handler(adapter->ocrdma_dev,
                                                         BE_DEV_SHUTDOWN);
                mutex_unlock(&be_adapter_list_lock);
        }
}

int be_roce_register_driver(struct ocrdma_driver *drv)
{
        struct be_adapter *dev;

        mutex_lock(&be_adapter_list_lock);
        if (ocrdma_drv) {
                mutex_unlock(&be_adapter_list_lock);
                return -EINVAL;
        }
        ocrdma_drv = drv;
        list_for_each_entry(dev, &be_adapter_list, entry) {
                _be_roce_dev_add(dev);
        }
        mutex_unlock(&be_adapter_list_lock);
        return 0;
}
EXPORT_SYMBOL(be_roce_register_driver);

void be_roce_unregister_driver(struct ocrdma_driver *drv)
{
        struct be_adapter *dev;

        mutex_lock(&be_adapter_list_lock);
        list_for_each_entry(dev, &be_adapter_list, entry) {
                if (dev->ocrdma_dev)
                        _be_roce_dev_remove(dev);
        }
        ocrdma_drv = NULL;
        mutex_unlock(&be_adapter_list_lock);
}
EXPORT_SYMBOL(be_roce_unregister_driver);