/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2004-2012 Emulex.  All rights reserved.           *
 * EMULEX and SLI are trademarks of Emulex.                        *
 * www.emulex.com                                                  *
 * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
 *                                                                 *
 * This program is free software; you can redistribute it and/or   *
 * modify it under the terms of version 2 of the GNU General       *
 * Public License as published by the Free Software Foundation.    *
 * This program is distributed in the hope that it will be useful. *
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
 * more details, a copy of which can be found in the file COPYING  *
 * included with this package.                                     *
 *******************************************************************/

#include <linux/mempool.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/interrupt.h>

#include <scsi/scsi_device.h>
#include <scsi/scsi_transport_fc.h>

#include <scsi/scsi.h>

#include "lpfc_hw4.h"
#include "lpfc_hw.h"
#include "lpfc_sli.h"
#include "lpfc_sli4.h"
#include "lpfc_nl.h"
#include "lpfc_disc.h"
#include "lpfc_scsi.h"
#include "lpfc.h"
#include "lpfc_crtn.h"

#define LPFC_MBUF_POOL_SIZE     64      /* max elements in MBUF safety pool */
#define LPFC_MEM_POOL_SIZE      64      /* max elem in non-DMA safety pool */


/**
 * lpfc_mem_alloc - create and allocate all PCI and memory pools
 * @phba: HBA to allocate pools for
 *
 * Description: Creates and allocates PCI pools lpfc_scsi_dma_buf_pool,
 * lpfc_mbuf_pool, lpfc_hrb_pool.  Creates and allocates kmalloc-backed mempools
 * for LPFC_MBOXQ_t and lpfc_nodelist.  Also allocates the VPI bitmask.
 *
 * Notes: Not interrupt-safe.  Must be called with no locks held.  If any
 * allocation fails, frees all successfully allocated memory before returning.
 *
 * Returns:
 *   0 on success
 *   -ENOMEM on failure (if any memory allocations fail)
 **/
int
lpfc_mem_alloc(struct lpfc_hba *phba, int align)
{
        struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
        int i;

        if (phba->sli_rev == LPFC_SLI_REV4)
                phba->lpfc_scsi_dma_buf_pool =
                        pci_pool_create("lpfc_scsi_dma_buf_pool",
                                phba->pcidev,
                                phba->cfg_sg_dma_buf_size,
                                phba->cfg_sg_dma_buf_size,
                                0);
        else
                phba->lpfc_scsi_dma_buf_pool =
                        pci_pool_create("lpfc_scsi_dma_buf_pool",
                                phba->pcidev, phba->cfg_sg_dma_buf_size,
                                align, 0);
        if (!phba->lpfc_scsi_dma_buf_pool)
                goto fail;

        phba->lpfc_mbuf_pool = pci_pool_create("lpfc_mbuf_pool", phba->pcidev,
                                                        LPFC_BPL_SIZE,
                                                        align, 0);
        if (!phba->lpfc_mbuf_pool)
                goto fail_free_dma_buf_pool;

        pool->elements = kmalloc(sizeof(struct lpfc_dmabuf) *
                                         LPFC_MBUF_POOL_SIZE, GFP_KERNEL);
        if (!pool->elements)
                goto fail_free_lpfc_mbuf_pool;

        pool->max_count = 0;
        pool->current_count = 0;
        for ( i = 0; i < LPFC_MBUF_POOL_SIZE; i++) {
                pool->elements[i].virt = pci_pool_alloc(phba->lpfc_mbuf_pool,
                                       GFP_KERNEL, &pool->elements[i].phys);
                if (!pool->elements[i].virt)
                        goto fail_free_mbuf_pool;
                pool->max_count++;
                pool->current_count++;
        }

        phba->mbox_mem_pool = mempool_create_kmalloc_pool(LPFC_MEM_POOL_SIZE,
                                                         sizeof(LPFC_MBOXQ_t));
        if (!phba->mbox_mem_pool)
                goto fail_free_mbuf_pool;

        phba->nlp_mem_pool = mempool_create_kmalloc_pool(LPFC_MEM_POOL_SIZE,
                                                sizeof(struct lpfc_nodelist));
        if (!phba->nlp_mem_pool)
                goto fail_free_mbox_pool;

        if (phba->sli_rev == LPFC_SLI_REV4) {
                phba->rrq_pool =
                        mempool_create_kmalloc_pool(LPFC_MEM_POOL_SIZE,
                                                sizeof(struct lpfc_node_rrq));
                if (!phba->rrq_pool)
                        goto fail_free_nlp_mem_pool;
                phba->lpfc_hrb_pool = pci_pool_create("lpfc_hrb_pool",
                                              phba->pcidev,
                                              LPFC_HDR_BUF_SIZE, align, 0);
                if (!phba->lpfc_hrb_pool)
                        goto fail_free_rrq_mem_pool;

                phba->lpfc_drb_pool = pci_pool_create("lpfc_drb_pool",
                                              phba->pcidev,
                                              LPFC_DATA_BUF_SIZE, align, 0);
                if (!phba->lpfc_drb_pool)
                        goto fail_free_hrb_pool;
                phba->lpfc_hbq_pool = NULL;
        } else {
                phba->lpfc_hbq_pool = pci_pool_create("lpfc_hbq_pool",
                        phba->pcidev, LPFC_BPL_SIZE, align, 0);
                if (!phba->lpfc_hbq_pool)
                        goto fail_free_nlp_mem_pool;
                phba->lpfc_hrb_pool = NULL;
                phba->lpfc_drb_pool = NULL;
        }

        return 0;
 fail_free_hrb_pool:
        pci_pool_destroy(phba->lpfc_hrb_pool);
        phba->lpfc_hrb_pool = NULL;
 fail_free_rrq_mem_pool:
        mempool_destroy(phba->rrq_pool);
        phba->rrq_pool = NULL;
 fail_free_nlp_mem_pool:
        mempool_destroy(phba->nlp_mem_pool);
        phba->nlp_mem_pool = NULL;
 fail_free_mbox_pool:
        mempool_destroy(phba->mbox_mem_pool);
        phba->mbox_mem_pool = NULL;
 fail_free_mbuf_pool:
        while (i--)
                pci_pool_free(phba->lpfc_mbuf_pool, pool->elements[i].virt,
                                                 pool->elements[i].phys);
        kfree(pool->elements);
 fail_free_lpfc_mbuf_pool:
        pci_pool_destroy(phba->lpfc_mbuf_pool);
        phba->lpfc_mbuf_pool = NULL;
 fail_free_dma_buf_pool:
        pci_pool_destroy(phba->lpfc_scsi_dma_buf_pool);
        phba->lpfc_scsi_dma_buf_pool = NULL;
 fail:
        return -ENOMEM;
}

/**
 * lpfc_mem_free - Frees memory allocated by lpfc_mem_alloc
 * @phba: HBA to free memory for
 *
 * Description: Free the memory allocated by lpfc_mem_alloc routine. This
 * routine is a the counterpart of lpfc_mem_alloc.
 *
 * Returns: None
 **/
void
lpfc_mem_free(struct lpfc_hba *phba)
{
        int i;
        struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;

        /* Free HBQ pools */
        lpfc_sli_hbqbuf_free_all(phba);
        if (phba->lpfc_drb_pool)
                pci_pool_destroy(phba->lpfc_drb_pool);
        phba->lpfc_drb_pool = NULL;
        if (phba->lpfc_hrb_pool)
                pci_pool_destroy(phba->lpfc_hrb_pool);
        phba->lpfc_hrb_pool = NULL;

        if (phba->lpfc_hbq_pool)
                pci_pool_destroy(phba->lpfc_hbq_pool);
        phba->lpfc_hbq_pool = NULL;

        if (phba->rrq_pool)
                mempool_destroy(phba->rrq_pool);
        phba->rrq_pool = NULL;

        /* Free NLP memory pool */
        mempool_destroy(phba->nlp_mem_pool);
        phba->nlp_mem_pool = NULL;

        /* Free mbox memory pool */
        mempool_destroy(phba->mbox_mem_pool);
        phba->mbox_mem_pool = NULL;

        /* Free MBUF memory pool */
        for (i = 0; i < pool->current_count; i++)
                pci_pool_free(phba->lpfc_mbuf_pool, pool->elements[i].virt,
                              pool->elements[i].phys);
        kfree(pool->elements);

        pci_pool_destroy(phba->lpfc_mbuf_pool);
        phba->lpfc_mbuf_pool = NULL;

        /* Free DMA buffer memory pool */
        pci_pool_destroy(phba->lpfc_scsi_dma_buf_pool);
        phba->lpfc_scsi_dma_buf_pool = NULL;

        return;
}

/**
 * lpfc_mem_free_all - Frees all PCI and driver memory
 * @phba: HBA to free memory for
 *
 * Description: Free memory from PCI and driver memory pools and also those
 * used : lpfc_scsi_dma_buf_pool, lpfc_mbuf_pool, lpfc_hrb_pool. Frees
 * kmalloc-backed mempools for LPFC_MBOXQ_t and lpfc_nodelist. Also frees
 * the VPI bitmask.
 *
 * Returns: None
 **/
void
lpfc_mem_free_all(struct lpfc_hba *phba)
{
        struct lpfc_sli *psli = &phba->sli;
        LPFC_MBOXQ_t *mbox, *next_mbox;
        struct lpfc_dmabuf   *mp;

        /* Free memory used in mailbox queue back to mailbox memory pool */
        list_for_each_entry_safe(mbox, next_mbox, &psli->mboxq, list) {
                mp = (struct lpfc_dmabuf *) (mbox->context1);
                if (mp) {
                        lpfc_mbuf_free(phba, mp->virt, mp->phys);
                        kfree(mp);
                }
                list_del(&mbox->list);
                mempool_free(mbox, phba->mbox_mem_pool);
        }
        /* Free memory used in mailbox cmpl list back to mailbox memory pool */
        list_for_each_entry_safe(mbox, next_mbox, &psli->mboxq_cmpl, list) {
                mp = (struct lpfc_dmabuf *) (mbox->context1);
                if (mp) {
                        lpfc_mbuf_free(phba, mp->virt, mp->phys);
                        kfree(mp);
                }
                list_del(&mbox->list);
                mempool_free(mbox, phba->mbox_mem_pool);
        }
        /* Free the active mailbox command back to the mailbox memory pool */
        spin_lock_irq(&phba->hbalock);
        psli->sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
        spin_unlock_irq(&phba->hbalock);
        if (psli->mbox_active) {
                mbox = psli->mbox_active;
                mp = (struct lpfc_dmabuf *) (mbox->context1);
                if (mp) {
                        lpfc_mbuf_free(phba, mp->virt, mp->phys);
                        kfree(mp);
                }
                mempool_free(mbox, phba->mbox_mem_pool);
                psli->mbox_active = NULL;
        }

        /* Free and destroy all the allocated memory pools */
        lpfc_mem_free(phba);

        /* Free the iocb lookup array */
        kfree(psli->iocbq_lookup);
        psli->iocbq_lookup = NULL;

        return;
}

/**
 * lpfc_mbuf_alloc - Allocate an mbuf from the lpfc_mbuf_pool PCI pool
 * @phba: HBA which owns the pool to allocate from
 * @mem_flags: indicates if this is a priority (MEM_PRI) allocation
 * @handle: used to return the DMA-mapped address of the mbuf
 *
 * Description: Allocates a DMA-mapped buffer from the lpfc_mbuf_pool PCI pool.
 * Allocates from generic pci_pool_alloc function first and if that fails and
 * mem_flags has MEM_PRI set (the only defined flag), returns an mbuf from the
 * HBA's pool.
 *
 * Notes: Not interrupt-safe.  Must be called with no locks held.  Takes
 * phba->hbalock.
 *
 * Returns:
 *   pointer to the allocated mbuf on success
 *   NULL on failure
 **/
void *
lpfc_mbuf_alloc(struct lpfc_hba *phba, int mem_flags, dma_addr_t *handle)
{
        struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
        unsigned long iflags;
        void *ret;

        ret = pci_pool_alloc(phba->lpfc_mbuf_pool, GFP_KERNEL, handle);

        spin_lock_irqsave(&phba->hbalock, iflags);
        if (!ret && (mem_flags & MEM_PRI) && pool->current_count) {
                pool->current_count--;
                ret = pool->elements[pool->current_count].virt;
                *handle = pool->elements[pool->current_count].phys;
        }
        spin_unlock_irqrestore(&phba->hbalock, iflags);
        return ret;
}

/**
 * __lpfc_mbuf_free - Free an mbuf from the lpfc_mbuf_pool PCI pool (locked)
 * @phba: HBA which owns the pool to return to
 * @virt: mbuf to free
 * @dma: the DMA-mapped address of the lpfc_mbuf_pool to be freed
 *
 * Description: Returns an mbuf lpfc_mbuf_pool to the lpfc_mbuf_safety_pool if
 * it is below its max_count, frees the mbuf otherwise.
 *
 * Notes: Must be called with phba->hbalock held to synchronize access to
 * lpfc_mbuf_safety_pool.
 *
 * Returns: None
 **/
void
__lpfc_mbuf_free(struct lpfc_hba * phba, void *virt, dma_addr_t dma)
{
        struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;

        if (pool->current_count < pool->max_count) {
                pool->elements[pool->current_count].virt = virt;
                pool->elements[pool->current_count].phys = dma;
                pool->current_count++;
        } else {
                pci_pool_free(phba->lpfc_mbuf_pool, virt, dma);
        }
        return;
}

/**
 * lpfc_mbuf_free - Free an mbuf from the lpfc_mbuf_pool PCI pool (unlocked)
 * @phba: HBA which owns the pool to return to
 * @virt: mbuf to free
 * @dma: the DMA-mapped address of the lpfc_mbuf_pool to be freed
 *
 * Description: Returns an mbuf lpfc_mbuf_pool to the lpfc_mbuf_safety_pool if
 * it is below its max_count, frees the mbuf otherwise.
 *
 * Notes: Takes phba->hbalock.  Can be called with or without other locks held.
 *
 * Returns: None
 **/
void
lpfc_mbuf_free(struct lpfc_hba * phba, void *virt, dma_addr_t dma)
{
        unsigned long iflags;

        spin_lock_irqsave(&phba->hbalock, iflags);
        __lpfc_mbuf_free(phba, virt, dma);
        spin_unlock_irqrestore(&phba->hbalock, iflags);
        return;
}

/**
 * lpfc_els_hbq_alloc - Allocate an HBQ buffer
 * @phba: HBA to allocate HBQ buffer for
 *
 * Description: Allocates a DMA-mapped HBQ buffer from the lpfc_hrb_pool PCI
 * pool along a non-DMA-mapped container for it.
 *
 * Notes: Not interrupt-safe.  Must be called with no locks held.
 *
 * Returns:
 *   pointer to HBQ on success
 *   NULL on failure
 **/
struct hbq_dmabuf *
lpfc_els_hbq_alloc(struct lpfc_hba *phba)
{
        struct hbq_dmabuf *hbqbp;

        hbqbp = kzalloc(sizeof(struct hbq_dmabuf), GFP_KERNEL);
        if (!hbqbp)
                return NULL;

        hbqbp->dbuf.virt = pci_pool_alloc(phba->lpfc_hbq_pool, GFP_KERNEL,
                                          &hbqbp->dbuf.phys);
        if (!hbqbp->dbuf.virt) {
                kfree(hbqbp);
                return NULL;
        }
        hbqbp->size = LPFC_BPL_SIZE;
        return hbqbp;
}

/**
 * lpfc_els_hbq_free - Frees an HBQ buffer allocated with lpfc_els_hbq_alloc
 * @phba: HBA buffer was allocated for
 * @hbqbp: HBQ container returned by lpfc_els_hbq_alloc
 *
 * Description: Frees both the container and the DMA-mapped buffer returned by
 * lpfc_els_hbq_alloc.
 *
 * Notes: Can be called with or without locks held.
 *
 * Returns: None
 **/
void
lpfc_els_hbq_free(struct lpfc_hba *phba, struct hbq_dmabuf *hbqbp)
{
        pci_pool_free(phba->lpfc_hbq_pool, hbqbp->dbuf.virt, hbqbp->dbuf.phys);
        kfree(hbqbp);
        return;
}

/**
 * lpfc_sli4_rb_alloc - Allocate an SLI4 Receive buffer
 * @phba: HBA to allocate a receive buffer for
 *
 * Description: Allocates a DMA-mapped receive buffer from the lpfc_hrb_pool PCI
 * pool along a non-DMA-mapped container for it.
 *
 * Notes: Not interrupt-safe.  Must be called with no locks held.
 *
 * Returns:
 *   pointer to HBQ on success
 *   NULL on failure
 **/
struct hbq_dmabuf *
lpfc_sli4_rb_alloc(struct lpfc_hba *phba)
{
        struct hbq_dmabuf *dma_buf;

        dma_buf = kzalloc(sizeof(struct hbq_dmabuf), GFP_KERNEL);
        if (!dma_buf)
                return NULL;

        dma_buf->hbuf.virt = pci_pool_alloc(phba->lpfc_hrb_pool, GFP_KERNEL,
                                            &dma_buf->hbuf.phys);
        if (!dma_buf->hbuf.virt) {
                kfree(dma_buf);
                return NULL;
        }
        dma_buf->dbuf.virt = pci_pool_alloc(phba->lpfc_drb_pool, GFP_KERNEL,
                                            &dma_buf->dbuf.phys);
        if (!dma_buf->dbuf.virt) {
                pci_pool_free(phba->lpfc_hrb_pool, dma_buf->hbuf.virt,
                              dma_buf->hbuf.phys);
                kfree(dma_buf);
                return NULL;
        }
        dma_buf->size = LPFC_BPL_SIZE;
        return dma_buf;
}

/**
 * lpfc_sli4_rb_free - Frees a receive buffer
 * @phba: HBA buffer was allocated for
 * @dmab: DMA Buffer container returned by lpfc_sli4_hbq_alloc
 *
 * Description: Frees both the container and the DMA-mapped buffers returned by
 * lpfc_sli4_rb_alloc.
 *
 * Notes: Can be called with or without locks held.
 *
 * Returns: None
 **/
void
lpfc_sli4_rb_free(struct lpfc_hba *phba, struct hbq_dmabuf *dmab)
{
        pci_pool_free(phba->lpfc_hrb_pool, dmab->hbuf.virt, dmab->hbuf.phys);
        pci_pool_free(phba->lpfc_drb_pool, dmab->dbuf.virt, dmab->dbuf.phys);
        kfree(dmab);
        return;
}

/**
 * lpfc_in_buf_free - Free a DMA buffer
 * @phba: HBA buffer is associated with
 * @mp: Buffer to free
 *
 * Description: Frees the given DMA buffer in the appropriate way given if the
 * HBA is running in SLI3 mode with HBQs enabled.
 *
 * Notes: Takes phba->hbalock.  Can be called with or without other locks held.
 *
 * Returns: None
 **/
void
lpfc_in_buf_free(struct lpfc_hba *phba, struct lpfc_dmabuf *mp)
{
        struct hbq_dmabuf *hbq_entry;
        unsigned long flags;

        if (!mp)
                return;

        if (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED) {
                /* Check whether HBQ is still in use */
                spin_lock_irqsave(&phba->hbalock, flags);
                if (!phba->hbq_in_use) {
                        spin_unlock_irqrestore(&phba->hbalock, flags);
                        return;
                }
                hbq_entry = container_of(mp, struct hbq_dmabuf, dbuf);
                list_del(&hbq_entry->dbuf.list);
                if (hbq_entry->tag == -1) {
                        (phba->hbqs[LPFC_ELS_HBQ].hbq_free_buffer)
                                (phba, hbq_entry);
                } else {
                        lpfc_sli_free_hbq(phba, hbq_entry);
                }
                spin_unlock_irqrestore(&phba->hbalock, flags);
        } else {
                lpfc_mbuf_free(phba, mp->virt, mp->phys);
                kfree(mp);
        }
        return;
}