/*
 * This file is part of the Chelsio FCoE driver for Linux.
 *
 * Copyright (c) 2008-2012 Chelsio Communications, Inc. 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/mm.h>
#include <linux/notifier.h>
#include <linux/kdebug.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/string.h>
#include <linux/export.h>

#include "csio_init.h"
#include "csio_defs.h"

#define CSIO_MIN_MEMPOOL_SZ     64

static struct dentry *csio_debugfs_root;

static struct scsi_transport_template *csio_fcoe_transport;
static struct scsi_transport_template *csio_fcoe_transport_vport;

/*
 * debugfs support
 */
static ssize_t
csio_mem_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
        loff_t pos = *ppos;
        loff_t avail = file_inode(file)->i_size;
        unsigned int mem = (uintptr_t)file->private_data & 3;
        struct csio_hw *hw = file->private_data - mem;

        if (pos < 0)
                return -EINVAL;
        if (pos >= avail)
                return 0;
        if (count > avail - pos)
                count = avail - pos;

        while (count) {
                size_t len;
                int ret, ofst;
                __be32 data[16];

                if (mem == MEM_MC)
                        ret = hw->chip_ops->chip_mc_read(hw, 0, pos,
                                                         data, NULL);
                else
                        ret = hw->chip_ops->chip_edc_read(hw, mem, pos,
                                                          data, NULL);
                if (ret)
                        return ret;

                ofst = pos % sizeof(data);
                len = min(count, sizeof(data) - ofst);
                if (copy_to_user(buf, (u8 *)data + ofst, len))
                        return -EFAULT;

                buf += len;
                pos += len;
                count -= len;
        }
        count = pos - *ppos;
        *ppos = pos;
        return count;
}

static const struct file_operations csio_mem_debugfs_fops = {
        .owner   = THIS_MODULE,
        .open    = simple_open,
        .read    = csio_mem_read,
        .llseek  = default_llseek,
};

void csio_add_debugfs_mem(struct csio_hw *hw, const char *name,
                                 unsigned int idx, unsigned int size_mb)
{
        debugfs_create_file_size(name, S_IRUSR, hw->debugfs_root,
                                 (void *)hw + idx, &csio_mem_debugfs_fops,
                                 size_mb << 20);
}

static int csio_setup_debugfs(struct csio_hw *hw)
{
        int i;

        if (IS_ERR_OR_NULL(hw->debugfs_root))
                return -1;

        i = csio_rd_reg32(hw, MA_TARGET_MEM_ENABLE_A);
        if (i & EDRAM0_ENABLE_F)
                csio_add_debugfs_mem(hw, "edc0", MEM_EDC0, 5);
        if (i & EDRAM1_ENABLE_F)
                csio_add_debugfs_mem(hw, "edc1", MEM_EDC1, 5);

        hw->chip_ops->chip_dfs_create_ext_mem(hw);
        return 0;
}

/*
 * csio_dfs_create - Creates and sets up per-hw debugfs.
 *
 */
static int
csio_dfs_create(struct csio_hw *hw)
{
        if (csio_debugfs_root) {
                hw->debugfs_root = debugfs_create_dir(pci_name(hw->pdev),
                                                        csio_debugfs_root);
                csio_setup_debugfs(hw);
        }

        return 0;
}

/*
 * csio_dfs_destroy - Destroys per-hw debugfs.
 */
static void
csio_dfs_destroy(struct csio_hw *hw)
{
        debugfs_remove_recursive(hw->debugfs_root);
}

/*
 * csio_dfs_init - Debug filesystem initialization for the module.
 *
 */
static void
csio_dfs_init(void)
{
        csio_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
}

/*
 * csio_dfs_exit - debugfs cleanup for the module.
 */
static void
csio_dfs_exit(void)
{
        debugfs_remove(csio_debugfs_root);
}

/*
 * csio_pci_init - PCI initialization.
 * @pdev: PCI device.
 * @bars: Bitmask of bars to be requested.
 *
 * Initializes the PCI function by enabling MMIO, setting bus
 * mastership and setting DMA mask.
 */
static int
csio_pci_init(struct pci_dev *pdev, int *bars)
{
        int rv = -ENODEV;

        *bars = pci_select_bars(pdev, IORESOURCE_MEM);

        if (pci_enable_device_mem(pdev))
                goto err;

        if (pci_request_selected_regions(pdev, *bars, KBUILD_MODNAME))
                goto err_disable_device;

        pci_set_master(pdev);
        pci_try_set_mwi(pdev);

        rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
        if (rv)
                rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
        if (rv) {
                rv = -ENODEV;
                dev_err(&pdev->dev, "No suitable DMA available.\n");
                goto err_release_regions;
        }

        return 0;

err_release_regions:
        pci_release_selected_regions(pdev, *bars);
err_disable_device:
        pci_disable_device(pdev);
err:
        return rv;

}

/*
 * csio_pci_exit - PCI unitialization.
 * @pdev: PCI device.
 * @bars: Bars to be released.
 *
 */
static void
csio_pci_exit(struct pci_dev *pdev, int *bars)
{
        pci_release_selected_regions(pdev, *bars);
        pci_disable_device(pdev);
}

/*
 * csio_hw_init_workers - Initialize the HW module's worker threads.
 * @hw: HW module.
 *
 */
static void
csio_hw_init_workers(struct csio_hw *hw)
{
        INIT_WORK(&hw->evtq_work, csio_evtq_worker);
}

static void
csio_hw_exit_workers(struct csio_hw *hw)
{
        cancel_work_sync(&hw->evtq_work);
}

static int
csio_create_queues(struct csio_hw *hw)
{
        int i, j;
        struct csio_mgmtm *mgmtm = csio_hw_to_mgmtm(hw);
        int rv;
        struct csio_scsi_cpu_info *info;

        if (hw->flags & CSIO_HWF_Q_FW_ALLOCED)
                return 0;

        if (hw->intr_mode != CSIO_IM_MSIX) {
                rv = csio_wr_iq_create(hw, NULL, hw->intr_iq_idx,
                                        0, hw->pport[0].portid, false, NULL);
                if (rv != 0) {
                        csio_err(hw, " Forward Interrupt IQ failed!: %d\n", rv);
                        return rv;
                }
        }

        /* FW event queue */
        rv = csio_wr_iq_create(hw, NULL, hw->fwevt_iq_idx,
                               csio_get_fwevt_intr_idx(hw),
                               hw->pport[0].portid, true, NULL);
        if (rv != 0) {
                csio_err(hw, "FW event IQ config failed!: %d\n", rv);
                return rv;
        }

        /* Create mgmt queue */
        rv = csio_wr_eq_create(hw, NULL, mgmtm->eq_idx,
                        mgmtm->iq_idx, hw->pport[0].portid, NULL);

        if (rv != 0) {
                csio_err(hw, "Mgmt EQ create failed!: %d\n", rv);
                goto err;
        }

        /* Create SCSI queues */
        for (i = 0; i < hw->num_pports; i++) {
                info = &hw->scsi_cpu_info[i];

                for (j = 0; j < info->max_cpus; j++) {
                        struct csio_scsi_qset *sqset = &hw->sqset[i][j];

                        rv = csio_wr_iq_create(hw, NULL, sqset->iq_idx,
                                               sqset->intr_idx, i, false, NULL);
                        if (rv != 0) {
                                csio_err(hw,
                                   "SCSI module IQ config failed [%d][%d]:%d\n",
                                   i, j, rv);
                                goto err;
                        }
                        rv = csio_wr_eq_create(hw, NULL, sqset->eq_idx,
                                               sqset->iq_idx, i, NULL);
                        if (rv != 0) {
                                csio_err(hw,
                                   "SCSI module EQ config failed [%d][%d]:%d\n",
                                   i, j, rv);
                                goto err;
                        }
                } /* for all CPUs */
        } /* For all ports */

        hw->flags |= CSIO_HWF_Q_FW_ALLOCED;
        return 0;
err:
        csio_wr_destroy_queues(hw, true);
        return -EINVAL;
}

/*
 * csio_config_queues - Configure the DMA queues.
 * @hw: HW module.
 *
 * Allocates memory for queues are registers them with FW.
 */
int
csio_config_queues(struct csio_hw *hw)
{
        int i, j, idx, k = 0;
        int rv;
        struct csio_scsi_qset *sqset;
        struct csio_mgmtm *mgmtm = csio_hw_to_mgmtm(hw);
        struct csio_scsi_qset *orig;
        struct csio_scsi_cpu_info *info;

        if (hw->flags & CSIO_HWF_Q_MEM_ALLOCED)
                return csio_create_queues(hw);

        /* Calculate number of SCSI queues for MSIX we would like */
        hw->num_scsi_msix_cpus = num_online_cpus();
        hw->num_sqsets = num_online_cpus() * hw->num_pports;

        if (hw->num_sqsets > CSIO_MAX_SCSI_QSETS) {
                hw->num_sqsets = CSIO_MAX_SCSI_QSETS;
                hw->num_scsi_msix_cpus = CSIO_MAX_SCSI_CPU;
        }

        /* Initialize max_cpus, may get reduced during msix allocations */
        for (i = 0; i < hw->num_pports; i++)
                hw->scsi_cpu_info[i].max_cpus = hw->num_scsi_msix_cpus;

        csio_dbg(hw, "nsqsets:%d scpus:%d\n",
                    hw->num_sqsets, hw->num_scsi_msix_cpus);

        csio_intr_enable(hw);

        if (hw->intr_mode != CSIO_IM_MSIX) {

                /* Allocate Forward interrupt iq. */
                hw->intr_iq_idx = csio_wr_alloc_q(hw, CSIO_INTR_IQSIZE,
                                                CSIO_INTR_WRSIZE, CSIO_INGRESS,
                                                (void *)hw, 0, 0, NULL);
                if (hw->intr_iq_idx == -1) {
                        csio_err(hw,
                                 "Forward interrupt queue creation failed\n");
                        goto intr_disable;
                }
        }

        /* Allocate the FW evt queue */
        hw->fwevt_iq_idx = csio_wr_alloc_q(hw, CSIO_FWEVT_IQSIZE,
                                           CSIO_FWEVT_WRSIZE,
                                           CSIO_INGRESS, (void *)hw,
                                           CSIO_FWEVT_FLBUFS, 0,
                                           csio_fwevt_intx_handler);
        if (hw->fwevt_iq_idx == -1) {
                csio_err(hw, "FW evt queue creation failed\n");
                goto intr_disable;
        }

        /* Allocate the mgmt queue */
        mgmtm->eq_idx = csio_wr_alloc_q(hw, CSIO_MGMT_EQSIZE,
                                      CSIO_MGMT_EQ_WRSIZE,
                                      CSIO_EGRESS, (void *)hw, 0, 0, NULL);
        if (mgmtm->eq_idx == -1) {
                csio_err(hw, "Failed to alloc egress queue for mgmt module\n");
                goto intr_disable;
        }

        /* Use FW IQ for MGMT req completion */
        mgmtm->iq_idx = hw->fwevt_iq_idx;

        /* Allocate SCSI queues */
        for (i = 0; i < hw->num_pports; i++) {
                info = &hw->scsi_cpu_info[i];

                for (j = 0; j < hw->num_scsi_msix_cpus; j++) {
                        sqset = &hw->sqset[i][j];

                        if (j >= info->max_cpus) {
                                k = j % info->max_cpus;
                                orig = &hw->sqset[i][k];
                                sqset->eq_idx = orig->eq_idx;
                                sqset->iq_idx = orig->iq_idx;
                                continue;
                        }

                        idx = csio_wr_alloc_q(hw, csio_scsi_eqsize, 0,
                                              CSIO_EGRESS, (void *)hw, 0, 0,
                                              NULL);
                        if (idx == -1) {
                                csio_err(hw, "EQ creation failed for idx:%d\n",
                                            idx);
                                goto intr_disable;
                        }

                        sqset->eq_idx = idx;

                        idx = csio_wr_alloc_q(hw, CSIO_SCSI_IQSIZE,
                                             CSIO_SCSI_IQ_WRSZ, CSIO_INGRESS,
                                             (void *)hw, 0, 0,
                                             csio_scsi_intx_handler);
                        if (idx == -1) {
                                csio_err(hw, "IQ creation failed for idx:%d\n",
                                            idx);
                                goto intr_disable;
                        }
                        sqset->iq_idx = idx;
                } /* for all CPUs */
        } /* For all ports */

        hw->flags |= CSIO_HWF_Q_MEM_ALLOCED;

        rv = csio_create_queues(hw);
        if (rv != 0)
                goto intr_disable;

        /*
         * Now request IRQs for the vectors. In the event of a failure,
         * cleanup is handled internally by this function.
         */
        rv = csio_request_irqs(hw);
        if (rv != 0)
                return -EINVAL;

        return 0;

intr_disable:
        csio_intr_disable(hw, false);

        return -EINVAL;
}

static int
csio_resource_alloc(struct csio_hw *hw)
{
        struct csio_wrm *wrm = csio_hw_to_wrm(hw);
        int rv = -ENOMEM;

        wrm->num_q = ((CSIO_MAX_SCSI_QSETS * 2) + CSIO_HW_NIQ +
                       CSIO_HW_NEQ + CSIO_HW_NFLQ + CSIO_HW_NINTXQ);

        hw->mb_mempool = mempool_create_kmalloc_pool(CSIO_MIN_MEMPOOL_SZ,
                                                  sizeof(struct csio_mb));
        if (!hw->mb_mempool)
                goto err;

        hw->rnode_mempool = mempool_create_kmalloc_pool(CSIO_MIN_MEMPOOL_SZ,
                                                     sizeof(struct csio_rnode));
        if (!hw->rnode_mempool)
                goto err_free_mb_mempool;

        hw->scsi_dma_pool = dma_pool_create("csio_scsi_dma_pool",
                                            &hw->pdev->dev, CSIO_SCSI_RSP_LEN,
                                            8, 0);
        if (!hw->scsi_dma_pool)
                goto err_free_rn_pool;

        return 0;

err_free_rn_pool:
        mempool_destroy(hw->rnode_mempool);
        hw->rnode_mempool = NULL;
err_free_mb_mempool:
        mempool_destroy(hw->mb_mempool);
        hw->mb_mempool = NULL;
err:
        return rv;
}

static void
csio_resource_free(struct csio_hw *hw)
{
        dma_pool_destroy(hw->scsi_dma_pool);
        hw->scsi_dma_pool = NULL;
        mempool_destroy(hw->rnode_mempool);
        hw->rnode_mempool = NULL;
        mempool_destroy(hw->mb_mempool);
        hw->mb_mempool = NULL;
}

/*
 * csio_hw_alloc - Allocate and initialize the HW module.
 * @pdev: PCI device.
 *
 * Allocates HW structure, DMA, memory resources, maps BARS to
 * host memory and initializes HW module.
 */
static struct csio_hw *csio_hw_alloc(struct pci_dev *pdev)
{
        struct csio_hw *hw;

        hw = kzalloc_obj(struct csio_hw);
        if (!hw)
                goto err;

        hw->pdev = pdev;
        strscpy(hw->drv_version, CSIO_DRV_VERSION,
                sizeof(hw->drv_version));

        /* memory pool/DMA pool allocation */
        if (csio_resource_alloc(hw))
                goto err_free_hw;

        /* Get the start address of registers from BAR 0 */
        hw->regstart = ioremap(pci_resource_start(pdev, 0),
                                       pci_resource_len(pdev, 0));
        if (!hw->regstart) {
                csio_err(hw, "Could not map BAR 0, regstart = %p\n",
                         hw->regstart);
                goto err_resource_free;
        }

        csio_hw_init_workers(hw);

        if (csio_hw_init(hw))
                goto err_unmap_bar;

        csio_dfs_create(hw);

        csio_dbg(hw, "hw:%p\n", hw);

        return hw;

err_unmap_bar:
        csio_hw_exit_workers(hw);
        iounmap(hw->regstart);
err_resource_free:
        csio_resource_free(hw);
err_free_hw:
        kfree(hw);
err:
        return NULL;
}

/*
 * csio_hw_free - Uninitialize and free the HW module.
 * @hw: The HW module
 *
 * Disable interrupts, uninit the HW module, free resources, free hw.
 */
static void
csio_hw_free(struct csio_hw *hw)
{
        csio_intr_disable(hw, true);
        csio_hw_exit_workers(hw);
        csio_hw_exit(hw);
        iounmap(hw->regstart);
        csio_dfs_destroy(hw);
        csio_resource_free(hw);
        kfree(hw);
}

/**
 * csio_shost_init - Create and initialize the lnode module.
 * @hw:         The HW module.
 * @dev:        The device associated with this invocation.
 * @probe:      Called from probe context or not?
 * @pln:        Parent lnode if any.
 *
 * Allocates lnode structure via scsi_host_alloc, initializes
 * shost, initializes lnode module and registers with SCSI ML
 * via scsi_host_add. This function is shared between physical and
 * virtual node ports.
 */
struct csio_lnode *
csio_shost_init(struct csio_hw *hw, struct device *dev,
                  bool probe, struct csio_lnode *pln)
{
        struct Scsi_Host  *shost = NULL;
        struct csio_lnode *ln;

        csio_fcoe_shost_template.cmd_per_lun = csio_lun_qdepth;
        csio_fcoe_shost_vport_template.cmd_per_lun = csio_lun_qdepth;

        /*
         * hw->pdev is the physical port's PCI dev structure,
         * which will be different from the NPIV dev structure.
         */
        if (dev == &hw->pdev->dev)
                shost = scsi_host_alloc(
                                &csio_fcoe_shost_template,
                                sizeof(struct csio_lnode));
        else
                shost = scsi_host_alloc(
                                &csio_fcoe_shost_vport_template,
                                sizeof(struct csio_lnode));

        if (!shost)
                goto err;

        ln = shost_priv(shost);
        memset(ln, 0, sizeof(struct csio_lnode));

        /* Link common lnode to this lnode */
        ln->dev_num = (shost->host_no << 16);

        shost->can_queue = CSIO_MAX_QUEUE;
        shost->this_id = -1;
        shost->unique_id = shost->host_no;
        shost->max_cmd_len = 16; /* Max CDB length supported */
        shost->max_id = min_t(uint32_t, csio_fcoe_rnodes,
                              hw->fres_info.max_ssns);
        shost->max_lun = CSIO_MAX_LUN;
        if (dev == &hw->pdev->dev)
                shost->transportt = csio_fcoe_transport;
        else
                shost->transportt = csio_fcoe_transport_vport;

        /* root lnode */
        if (!hw->rln)
                hw->rln = ln;

        /* Other initialization here: Common, Transport specific */
        if (csio_lnode_init(ln, hw, pln))
                goto err_shost_put;

        if (scsi_add_host_with_dma(shost, dev, &hw->pdev->dev))
                goto err_lnode_exit;

        return ln;

err_lnode_exit:
        csio_lnode_exit(ln);
err_shost_put:
        scsi_host_put(shost);
err:
        return NULL;
}

/**
 * csio_shost_exit - De-instantiate the shost.
 * @ln:         The lnode module corresponding to the shost.
 *
 */
void
csio_shost_exit(struct csio_lnode *ln)
{
        struct Scsi_Host *shost = csio_ln_to_shost(ln);
        struct csio_hw *hw = csio_lnode_to_hw(ln);

        /* Inform transport */
        fc_remove_host(shost);

        /* Inform SCSI ML */
        scsi_remove_host(shost);

        /* Flush all the events, so that any rnode removal events
         * already queued are all handled, before we remove the lnode.
         */
        spin_lock_irq(&hw->lock);
        csio_evtq_flush(hw);
        spin_unlock_irq(&hw->lock);

        csio_lnode_exit(ln);
        scsi_host_put(shost);
}

struct csio_lnode *
csio_lnode_alloc(struct csio_hw *hw)
{
        return csio_shost_init(hw, &hw->pdev->dev, false, NULL);
}

void
csio_lnodes_block_request(struct csio_hw *hw)
{
        struct Scsi_Host  *shost;
        struct csio_lnode *sln;
        struct csio_lnode *ln;
        struct list_head *cur_ln, *cur_cln;
        struct csio_lnode **lnode_list;
        int cur_cnt = 0, ii;

        lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
                        GFP_KERNEL);
        if (!lnode_list) {
                csio_err(hw, "Failed to allocate lnodes_list");
                return;
        }

        spin_lock_irq(&hw->lock);
        /* Traverse sibling lnodes */
        list_for_each(cur_ln, &hw->sln_head) {
                sln = (struct csio_lnode *) cur_ln;
                lnode_list[cur_cnt++] = sln;

                /* Traverse children lnodes */
                list_for_each(cur_cln, &sln->cln_head)
                        lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
        }
        spin_unlock_irq(&hw->lock);

        for (ii = 0; ii < cur_cnt; ii++) {
                csio_dbg(hw, "Blocking IOs on lnode: %p\n", lnode_list[ii]);
                ln = lnode_list[ii];
                shost = csio_ln_to_shost(ln);
                scsi_block_requests(shost);

        }
        kfree(lnode_list);
}

void
csio_lnodes_unblock_request(struct csio_hw *hw)
{
        struct csio_lnode *ln;
        struct Scsi_Host  *shost;
        struct csio_lnode *sln;
        struct list_head *cur_ln, *cur_cln;
        struct csio_lnode **lnode_list;
        int cur_cnt = 0, ii;

        lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
                        GFP_KERNEL);
        if (!lnode_list) {
                csio_err(hw, "Failed to allocate lnodes_list");
                return;
        }

        spin_lock_irq(&hw->lock);
        /* Traverse sibling lnodes */
        list_for_each(cur_ln, &hw->sln_head) {
                sln = (struct csio_lnode *) cur_ln;
                lnode_list[cur_cnt++] = sln;

                /* Traverse children lnodes */
                list_for_each(cur_cln, &sln->cln_head)
                        lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
        }
        spin_unlock_irq(&hw->lock);

        for (ii = 0; ii < cur_cnt; ii++) {
                csio_dbg(hw, "unblocking IOs on lnode: %p\n", lnode_list[ii]);
                ln = lnode_list[ii];
                shost = csio_ln_to_shost(ln);
                scsi_unblock_requests(shost);
        }
        kfree(lnode_list);
}

void
csio_lnodes_block_by_port(struct csio_hw *hw, uint8_t portid)
{
        struct csio_lnode *ln;
        struct Scsi_Host  *shost;
        struct csio_lnode *sln;
        struct list_head *cur_ln, *cur_cln;
        struct csio_lnode **lnode_list;
        int cur_cnt = 0, ii;

        lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
                        GFP_KERNEL);
        if (!lnode_list) {
                csio_err(hw, "Failed to allocate lnodes_list");
                return;
        }

        spin_lock_irq(&hw->lock);
        /* Traverse sibling lnodes */
        list_for_each(cur_ln, &hw->sln_head) {
                sln = (struct csio_lnode *) cur_ln;
                if (sln->portid != portid)
                        continue;

                lnode_list[cur_cnt++] = sln;

                /* Traverse children lnodes */
                list_for_each(cur_cln, &sln->cln_head)
                        lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
        }
        spin_unlock_irq(&hw->lock);

        for (ii = 0; ii < cur_cnt; ii++) {
                csio_dbg(hw, "Blocking IOs on lnode: %p\n", lnode_list[ii]);
                ln = lnode_list[ii];
                shost = csio_ln_to_shost(ln);
                scsi_block_requests(shost);
        }
        kfree(lnode_list);
}

void
csio_lnodes_unblock_by_port(struct csio_hw *hw, uint8_t portid)
{
        struct csio_lnode *ln;
        struct Scsi_Host  *shost;
        struct csio_lnode *sln;
        struct list_head *cur_ln, *cur_cln;
        struct csio_lnode **lnode_list;
        int cur_cnt = 0, ii;

        lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
                        GFP_KERNEL);
        if (!lnode_list) {
                csio_err(hw, "Failed to allocate lnodes_list");
                return;
        }

        spin_lock_irq(&hw->lock);
        /* Traverse sibling lnodes */
        list_for_each(cur_ln, &hw->sln_head) {
                sln = (struct csio_lnode *) cur_ln;
                if (sln->portid != portid)
                        continue;
                lnode_list[cur_cnt++] = sln;

                /* Traverse children lnodes */
                list_for_each(cur_cln, &sln->cln_head)
                        lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
        }
        spin_unlock_irq(&hw->lock);

        for (ii = 0; ii < cur_cnt; ii++) {
                csio_dbg(hw, "unblocking IOs on lnode: %p\n", lnode_list[ii]);
                ln = lnode_list[ii];
                shost = csio_ln_to_shost(ln);
                scsi_unblock_requests(shost);
        }
        kfree(lnode_list);
}

void
csio_lnodes_exit(struct csio_hw *hw, bool npiv)
{
        struct csio_lnode *sln;
        struct csio_lnode *ln;
        struct list_head *cur_ln, *cur_cln;
        struct csio_lnode **lnode_list;
        int cur_cnt = 0, ii;

        lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
                        GFP_KERNEL);
        if (!lnode_list) {
                csio_err(hw, "lnodes_exit: Failed to allocate lnodes_list.\n");
                return;
        }

        /* Get all child lnodes(NPIV ports) */
        spin_lock_irq(&hw->lock);
        list_for_each(cur_ln, &hw->sln_head) {
                sln = (struct csio_lnode *) cur_ln;

                /* Traverse children lnodes */
                list_for_each(cur_cln, &sln->cln_head)
                        lnode_list[cur_cnt++] = (struct csio_lnode *) cur_cln;
        }
        spin_unlock_irq(&hw->lock);

        /* Delete NPIV lnodes */
        for (ii = 0; ii < cur_cnt; ii++) {
                csio_dbg(hw, "Deleting child lnode: %p\n", lnode_list[ii]);
                ln = lnode_list[ii];
                fc_vport_terminate(ln->fc_vport);
        }

        /* Delete only npiv lnodes */
        if (npiv)
                goto free_lnodes;

        cur_cnt = 0;
        /* Get all physical lnodes */
        spin_lock_irq(&hw->lock);
        /* Traverse sibling lnodes */
        list_for_each(cur_ln, &hw->sln_head) {
                sln = (struct csio_lnode *) cur_ln;
                lnode_list[cur_cnt++] = sln;
        }
        spin_unlock_irq(&hw->lock);

        /* Delete physical lnodes */
        for (ii = 0; ii < cur_cnt; ii++) {
                csio_dbg(hw, "Deleting parent lnode: %p\n", lnode_list[ii]);
                csio_shost_exit(lnode_list[ii]);
        }

free_lnodes:
        kfree(lnode_list);
}

/*
 * csio_lnode_init_post: Set lnode attributes after starting HW.
 * @ln: lnode.
 *
 */
static void
csio_lnode_init_post(struct csio_lnode *ln)
{
        struct Scsi_Host  *shost = csio_ln_to_shost(ln);

        csio_fchost_attr_init(ln);

        scsi_scan_host(shost);
}

/*
 * csio_probe_one - Instantiate this function.
 * @pdev: PCI device
 * @id: Device ID
 *
 * This is the .probe() callback of the driver. This function:
 * - Initializes the PCI function by enabling MMIO, setting bus
 *   mastership and setting DMA mask.
 * - Allocates HW structure, DMA, memory resources, maps BARS to
 *   host memory and initializes HW module.
 * - Allocates lnode structure via scsi_host_alloc, initializes
 *   shost, initialized lnode module and registers with SCSI ML
 *   via scsi_host_add.
 * - Enables interrupts, and starts the chip by kicking off the
 *   HW state machine.
 * - Once hardware is ready, initiated scan of the host via
 *   scsi_scan_host.
 */
static int csio_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
        int rv;
        int bars;
        int i;
        struct csio_hw *hw;
        struct csio_lnode *ln;

        /* probe only T5 and T6 cards */
        if (!csio_is_t5((pdev->device & CSIO_HW_CHIP_MASK)) &&
            !csio_is_t6((pdev->device & CSIO_HW_CHIP_MASK)))
                return -ENODEV;

        rv = csio_pci_init(pdev, &bars);
        if (rv)
                goto err;

        hw = csio_hw_alloc(pdev);
        if (!hw) {
                rv = -ENODEV;
                goto err_pci_exit;
        }

        if (!pcie_relaxed_ordering_enabled(pdev))
                hw->flags |= CSIO_HWF_ROOT_NO_RELAXED_ORDERING;

        pci_set_drvdata(pdev, hw);

        rv = csio_hw_start(hw);
        if (rv) {
                if (rv == -EINVAL) {
                        dev_err(&pdev->dev,
                                "Failed to start FW, continuing in debug mode.\n");
                        return 0;
                }
                goto err_lnode_exit;
        }

        sprintf(hw->fwrev_str, "%u.%u.%u.%u\n",
                    FW_HDR_FW_VER_MAJOR_G(hw->fwrev),
                    FW_HDR_FW_VER_MINOR_G(hw->fwrev),
                    FW_HDR_FW_VER_MICRO_G(hw->fwrev),
                    FW_HDR_FW_VER_BUILD_G(hw->fwrev));

        for (i = 0; i < hw->num_pports; i++) {
                ln = csio_shost_init(hw, &pdev->dev, true, NULL);
                if (!ln) {
                        rv = -ENODEV;
                        break;
                }
                /* Initialize portid */
                ln->portid = hw->pport[i].portid;

                spin_lock_irq(&hw->lock);
                if (csio_lnode_start(ln) != 0)
                        rv = -ENODEV;
                spin_unlock_irq(&hw->lock);

                if (rv)
                        break;

                csio_lnode_init_post(ln);
        }

        if (rv)
                goto err_lnode_exit;

        return 0;

err_lnode_exit:
        csio_lnodes_block_request(hw);
        spin_lock_irq(&hw->lock);
        csio_hw_stop(hw);
        spin_unlock_irq(&hw->lock);
        csio_lnodes_unblock_request(hw);
        csio_lnodes_exit(hw, 0);
        csio_hw_free(hw);
err_pci_exit:
        csio_pci_exit(pdev, &bars);
err:
        dev_err(&pdev->dev, "probe of device failed: %d\n", rv);
        return rv;
}

/*
 * csio_remove_one - Remove one instance of the driver at this PCI function.
 * @pdev: PCI device
 *
 * Used during hotplug operation.
 */
static void csio_remove_one(struct pci_dev *pdev)
{
        struct csio_hw *hw = pci_get_drvdata(pdev);
        int bars = pci_select_bars(pdev, IORESOURCE_MEM);

        csio_lnodes_block_request(hw);
        spin_lock_irq(&hw->lock);

        /* Stops lnode, Rnode s/m
         * Quiesce IOs.
         * All sessions with remote ports are unregistered.
         */
        csio_hw_stop(hw);
        spin_unlock_irq(&hw->lock);
        csio_lnodes_unblock_request(hw);

        csio_lnodes_exit(hw, 0);
        csio_hw_free(hw);
        csio_pci_exit(pdev, &bars);
}

/*
 * csio_pci_error_detected - PCI error was detected
 * @pdev: PCI device
 *
 */
static pci_ers_result_t
csio_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
{
        struct csio_hw *hw = pci_get_drvdata(pdev);

        csio_lnodes_block_request(hw);
        spin_lock_irq(&hw->lock);

        /* Post PCI error detected evt to HW s/m
         * HW s/m handles this evt by quiescing IOs, unregisters rports
         * and finally takes the device to offline.
         */
        csio_post_event(&hw->sm, CSIO_HWE_PCIERR_DETECTED);
        spin_unlock_irq(&hw->lock);
        csio_lnodes_unblock_request(hw);
        csio_lnodes_exit(hw, 0);
        csio_intr_disable(hw, true);
        pci_disable_device(pdev);
        return state == pci_channel_io_perm_failure ?
                PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_NEED_RESET;
}

/*
 * csio_pci_slot_reset - PCI slot has been reset.
 * @pdev: PCI device
 *
 */
static pci_ers_result_t
csio_pci_slot_reset(struct pci_dev *pdev)
{
        struct csio_hw *hw = pci_get_drvdata(pdev);
        int ready;

        if (pci_enable_device(pdev)) {
                dev_err(&pdev->dev, "cannot re-enable device in slot reset\n");
                return PCI_ERS_RESULT_DISCONNECT;
        }

        pci_set_master(pdev);
        pci_restore_state(pdev);

        /* Bring HW s/m to ready state.
         * but don't resume IOs.
         */
        spin_lock_irq(&hw->lock);
        csio_post_event(&hw->sm, CSIO_HWE_PCIERR_SLOT_RESET);
        ready = csio_is_hw_ready(hw);
        spin_unlock_irq(&hw->lock);

        if (ready) {
                return PCI_ERS_RESULT_RECOVERED;
        } else {
                dev_err(&pdev->dev, "Can't initialize HW when in slot reset\n");
                return PCI_ERS_RESULT_DISCONNECT;
        }
}

/*
 * csio_pci_resume - Resume normal operations
 * @pdev: PCI device
 *
 */
static void
csio_pci_resume(struct pci_dev *pdev)
{
        struct csio_hw *hw = pci_get_drvdata(pdev);
        struct csio_lnode *ln;
        int rv = 0;
        int i;

        /* Bring the LINK UP and Resume IO */

        for (i = 0; i < hw->num_pports; i++) {
                ln = csio_shost_init(hw, &pdev->dev, true, NULL);
                if (!ln) {
                        rv = -ENODEV;
                        break;
                }
                /* Initialize portid */
                ln->portid = hw->pport[i].portid;

                spin_lock_irq(&hw->lock);
                if (csio_lnode_start(ln) != 0)
                        rv = -ENODEV;
                spin_unlock_irq(&hw->lock);

                if (rv)
                        break;

                csio_lnode_init_post(ln);
        }

        if (rv)
                goto err_resume_exit;

        return;

err_resume_exit:
        csio_lnodes_block_request(hw);
        spin_lock_irq(&hw->lock);
        csio_hw_stop(hw);
        spin_unlock_irq(&hw->lock);
        csio_lnodes_unblock_request(hw);
        csio_lnodes_exit(hw, 0);
        csio_hw_free(hw);
        dev_err(&pdev->dev, "resume of device failed: %d\n", rv);
}

static const struct pci_error_handlers csio_err_handler = {
        .error_detected = csio_pci_error_detected,
        .slot_reset     = csio_pci_slot_reset,
        .resume         = csio_pci_resume,
};

/*
 *  Macros needed to support the PCI Device ID Table ...
 */
#define CH_PCI_DEVICE_ID_TABLE_DEFINE_BEGIN \
        static const struct pci_device_id csio_pci_tbl[] = {
/* Define for FCoE uses PF6 */
#define CH_PCI_DEVICE_ID_FUNCTION       0x6

#define CH_PCI_ID_TABLE_ENTRY(devid) \
                { PCI_VDEVICE(CHELSIO, (devid)), 0 }

#define CH_PCI_DEVICE_ID_TABLE_DEFINE_END { 0, } }

#include "t4_pci_id_tbl.h"

static struct pci_driver csio_pci_driver = {
        .name           = KBUILD_MODNAME,
        .id_table       = csio_pci_tbl,
        .probe          = csio_probe_one,
        .remove         = csio_remove_one,
        .err_handler    = &csio_err_handler,
};

/*
 * csio_init - Chelsio storage driver initialization function.
 *
 */
static int __init
csio_init(void)
{
        int rv = -ENOMEM;

        pr_info("%s %s\n", CSIO_DRV_DESC, CSIO_DRV_VERSION);

        csio_dfs_init();

        csio_fcoe_transport = fc_attach_transport(&csio_fc_transport_funcs);
        if (!csio_fcoe_transport)
                goto err;

        csio_fcoe_transport_vport =
                        fc_attach_transport(&csio_fc_transport_vport_funcs);
        if (!csio_fcoe_transport_vport)
                goto err_vport;

        rv = pci_register_driver(&csio_pci_driver);
        if (rv)
                goto err_pci;

        return 0;

err_pci:
        fc_release_transport(csio_fcoe_transport_vport);
err_vport:
        fc_release_transport(csio_fcoe_transport);
err:
        csio_dfs_exit();
        return rv;
}

/*
 * csio_exit - Chelsio storage driver uninitialization .
 *
 * Function that gets called in the unload path.
 */
static void __exit
csio_exit(void)
{
        pci_unregister_driver(&csio_pci_driver);
        csio_dfs_exit();
        fc_release_transport(csio_fcoe_transport_vport);
        fc_release_transport(csio_fcoe_transport);
}

module_init(csio_init);
module_exit(csio_exit);
MODULE_AUTHOR(CSIO_DRV_AUTHOR);
MODULE_DESCRIPTION(CSIO_DRV_DESC);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DEVICE_TABLE(pci, csio_pci_tbl);
MODULE_VERSION(CSIO_DRV_VERSION);
MODULE_FIRMWARE(FW_FNAME_T5);
MODULE_FIRMWARE(FW_FNAME_T6);
MODULE_SOFTDEP("pre: cxgb4");