[mirror_ubuntu-bionic-kernel.git] / drivers / scsi / megaraid / megaraid_mm.c

/*
 *
 *                      Linux MegaRAID device driver
 *
 * Copyright (c) 2003-2004  LSI Logic Corporation.
 *
 *         This program is free software; you can redistribute it and/or
 *         modify it under the terms of the GNU General Public License
 *         as published by the Free Software Foundation; either version
 *         2 of the License, or (at your option) any later version.
 *
 * FILE         : megaraid_mm.c
 * Version      : v2.20.2.7 (Jul 16 2006)
 *
 * Common management module
 */
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include "megaraid_mm.h"


// Entry points for char node driver
static DEFINE_MUTEX(mraid_mm_mutex);
static int mraid_mm_open(struct inode *, struct file *);
static long mraid_mm_unlocked_ioctl(struct file *, uint, unsigned long);


// routines to convert to and from the old the format
static int mimd_to_kioc(mimd_t __user *, mraid_mmadp_t *, uioc_t *);
static int kioc_to_mimd(uioc_t *, mimd_t __user *);


// Helper functions
static int handle_drvrcmd(void __user *, uint8_t, int *);
static int lld_ioctl(mraid_mmadp_t *, uioc_t *);
static void ioctl_done(uioc_t *);
static void lld_timedout(unsigned long);
static void hinfo_to_cinfo(mraid_hba_info_t *, mcontroller_t *);
static mraid_mmadp_t *mraid_mm_get_adapter(mimd_t __user *, int *);
static uioc_t *mraid_mm_alloc_kioc(mraid_mmadp_t *);
static void mraid_mm_dealloc_kioc(mraid_mmadp_t *, uioc_t *);
static int mraid_mm_attach_buf(mraid_mmadp_t *, uioc_t *, int);
static int mraid_mm_setup_dma_pools(mraid_mmadp_t *);
static void mraid_mm_free_adp_resources(mraid_mmadp_t *);
static void mraid_mm_teardown_dma_pools(mraid_mmadp_t *);

#ifdef CONFIG_COMPAT
static long mraid_mm_compat_ioctl(struct file *, unsigned int, unsigned long);
#endif

MODULE_AUTHOR("LSI Logic Corporation");
MODULE_DESCRIPTION("LSI Logic Management Module");
MODULE_LICENSE("GPL");
MODULE_VERSION(LSI_COMMON_MOD_VERSION);

static int dbglevel = CL_ANN;
module_param_named(dlevel, dbglevel, int, 0);
MODULE_PARM_DESC(dlevel, "Debug level (default=0)");

EXPORT_SYMBOL(mraid_mm_register_adp);
EXPORT_SYMBOL(mraid_mm_unregister_adp);
EXPORT_SYMBOL(mraid_mm_adapter_app_handle);

static uint32_t drvr_ver        = 0x02200207;

static int adapters_count_g;
static struct list_head adapters_list_g;

static wait_queue_head_t wait_q;

static const struct file_operations lsi_fops = {
        .open   = mraid_mm_open,
        .unlocked_ioctl = mraid_mm_unlocked_ioctl,
#ifdef CONFIG_COMPAT
        .compat_ioctl = mraid_mm_compat_ioctl,
#endif
        .owner  = THIS_MODULE,
        .llseek = noop_llseek,
};

static struct miscdevice megaraid_mm_dev = {
        .minor  = MISC_DYNAMIC_MINOR,
        .name   = "megadev0",
        .fops   = &lsi_fops,
};

/**
 * mraid_mm_open - open routine for char node interface
 * @inode       : unused
 * @filep       : unused
 *
 * Allow ioctl operations by apps only if they have superuser privilege.
 */
static int
mraid_mm_open(struct inode *inode, struct file *filep)
{
        /*
         * Only allow superuser to access private ioctl interface
         */
        if (!capable(CAP_SYS_ADMIN)) return (-EACCES);

        return 0;
}

/**
 * mraid_mm_ioctl - module entry-point for ioctls
 * @inode       : inode (ignored)
 * @filep       : file operations pointer (ignored)
 * @cmd         : ioctl command
 * @arg         : user ioctl packet
 */
static int
mraid_mm_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
{
        uioc_t          *kioc;
        char            signature[EXT_IOCTL_SIGN_SZ]    = {0};
        int             rval;
        mraid_mmadp_t   *adp;
        uint8_t         old_ioctl;
        int             drvrcmd_rval;
        void __user *argp = (void __user *)arg;

        /*
         * Make sure only USCSICMD are issued through this interface.
         * MIMD application would still fire different command.
         */

        if ((_IOC_TYPE(cmd) != MEGAIOC_MAGIC) && (cmd != USCSICMD)) {
                return (-EINVAL);
        }

        /*
         * Look for signature to see if this is the new or old ioctl format.
         */
        if (copy_from_user(signature, argp, EXT_IOCTL_SIGN_SZ)) {
                con_log(CL_ANN, (KERN_WARNING
                        "megaraid cmm: copy from usr addr failed\n"));
                return (-EFAULT);
        }

        if (memcmp(signature, EXT_IOCTL_SIGN, EXT_IOCTL_SIGN_SZ) == 0)
                old_ioctl = 0;
        else
                old_ioctl = 1;

        /*
         * At present, we don't support the new ioctl packet
         */
        if (!old_ioctl )
                return (-EINVAL);

        /*
         * If it is a driver ioctl (as opposed to fw ioctls), then we can
         * handle the command locally. rval > 0 means it is not a drvr cmd
         */
        rval = handle_drvrcmd(argp, old_ioctl, &drvrcmd_rval);

        if (rval < 0)
                return rval;
        else if (rval == 0)
                return drvrcmd_rval;

        rval = 0;
        if ((adp = mraid_mm_get_adapter(argp, &rval)) == NULL) {
                return rval;
        }

        /*
         * Check if adapter can accept ioctl. We may have marked it offline
         * if any previous kioc had timedout on this controller.
         */
        if (!adp->quiescent) {
                con_log(CL_ANN, (KERN_WARNING
                        "megaraid cmm: controller cannot accept cmds due to "
                        "earlier errors\n" ));
                return -EFAULT;
        }

        /*
         * The following call will block till a kioc is available
         * or return NULL if the list head is empty for the pointer
         * of type mraid_mmapt passed to mraid_mm_alloc_kioc
         */
        kioc = mraid_mm_alloc_kioc(adp);
        if (!kioc)
                return -ENXIO;

        /*
         * User sent the old mimd_t ioctl packet. Convert it to uioc_t.
         */
        if ((rval = mimd_to_kioc(argp, adp, kioc))) {
                mraid_mm_dealloc_kioc(adp, kioc);
                return rval;
        }

        kioc->done = ioctl_done;

        /*
         * Issue the IOCTL to the low level driver. After the IOCTL completes
         * release the kioc if and only if it was _not_ timedout. If it was
         * timedout, that means that resources are still with low level driver.
         */
        if ((rval = lld_ioctl(adp, kioc))) {

                if (!kioc->timedout)
                        mraid_mm_dealloc_kioc(adp, kioc);

                return rval;
        }

        /*
         * Convert the kioc back to user space
         */
        rval = kioc_to_mimd(kioc, argp);

        /*
         * Return the kioc to free pool
         */
        mraid_mm_dealloc_kioc(adp, kioc);

        return rval;
}

static long
mraid_mm_unlocked_ioctl(struct file *filep, unsigned int cmd,
                        unsigned long arg)
{
        int err;

        /* inconsistent: mraid_mm_compat_ioctl doesn't take the BKL */
        mutex_lock(&mraid_mm_mutex);
        err = mraid_mm_ioctl(filep, cmd, arg);
        mutex_unlock(&mraid_mm_mutex);

        return err;
}

/**
 * mraid_mm_get_adapter - Returns corresponding adapters for the mimd packet
 * @umimd       : User space mimd_t ioctl packet
 * @rval        : returned success/error status
 *
 * The function return value is a pointer to the located @adapter.
 */
static mraid_mmadp_t *
mraid_mm_get_adapter(mimd_t __user *umimd, int *rval)
{
        mraid_mmadp_t   *adapter;
        mimd_t          mimd;
        uint32_t        adapno;
        int             iterator;


        if (copy_from_user(&mimd, umimd, sizeof(mimd_t))) {
                *rval = -EFAULT;
                return NULL;
        }

        adapno = GETADAP(mimd.ui.fcs.adapno);

        if (adapno >= adapters_count_g) {
                *rval = -ENODEV;
                return NULL;
        }

        adapter = NULL;
        iterator = 0;

        list_for_each_entry(adapter, &adapters_list_g, list) {
                if (iterator++ == adapno) break;
        }

        if (!adapter) {
                *rval = -ENODEV;
                return NULL;
        }

        return adapter;
}

/**
 * handle_drvrcmd - Checks if the opcode is a driver cmd and if it is, handles it.
 * @arg         : packet sent by the user app
 * @old_ioctl   : mimd if 1; uioc otherwise
 * @rval        : pointer for command's returned value (not function status)
 */
static int
handle_drvrcmd(void __user *arg, uint8_t old_ioctl, int *rval)
{
        mimd_t          __user *umimd;
        mimd_t          kmimd;
        uint8_t         opcode;
        uint8_t         subopcode;

        if (old_ioctl)
                goto old_packet;
        else
                goto new_packet;

new_packet:
        return (-ENOTSUPP);

old_packet:
        *rval = 0;
        umimd = arg;

        if (copy_from_user(&kmimd, umimd, sizeof(mimd_t)))
                return (-EFAULT);

        opcode          = kmimd.ui.fcs.opcode;
        subopcode       = kmimd.ui.fcs.subopcode;

        /*
         * If the opcode is 0x82 and the subopcode is either GET_DRVRVER or
         * GET_NUMADP, then we can handle. Otherwise we should return 1 to
         * indicate that we cannot handle this.
         */
        if (opcode != 0x82)
                return 1;

        switch (subopcode) {

        case MEGAIOC_QDRVRVER:

                if (copy_to_user(kmimd.data, &drvr_ver, sizeof(uint32_t)))
                        return (-EFAULT);

                return 0;

        case MEGAIOC_QNADAP:

                *rval = adapters_count_g;

                if (copy_to_user(kmimd.data, &adapters_count_g,
                                sizeof(uint32_t)))
                        return (-EFAULT);

                return 0;

        default:
                /* cannot handle */
                return 1;
        }

        return 0;
}


/**
 * mimd_to_kioc - Converter from old to new ioctl format
 * @umimd       : user space old MIMD IOCTL
 * @adp         : adapter softstate
 * @kioc        : kernel space new format IOCTL
 *
 * Routine to convert MIMD interface IOCTL to new interface IOCTL packet. The
 * new packet is in kernel space so that driver can perform operations on it
 * freely.
 */

static int
mimd_to_kioc(mimd_t __user *umimd, mraid_mmadp_t *adp, uioc_t *kioc)
{
        mbox64_t                *mbox64;
        mbox_t                  *mbox;
        mraid_passthru_t        *pthru32;
        uint32_t                adapno;
        uint8_t                 opcode;
        uint8_t                 subopcode;
        mimd_t                  mimd;

        if (copy_from_user(&mimd, umimd, sizeof(mimd_t)))
                return (-EFAULT);

        /*
         * Applications are not allowed to send extd pthru
         */
        if ((mimd.mbox[0] == MBOXCMD_PASSTHRU64) ||
                        (mimd.mbox[0] == MBOXCMD_EXTPTHRU))
                return (-EINVAL);

        opcode          = mimd.ui.fcs.opcode;
        subopcode       = mimd.ui.fcs.subopcode;
        adapno          = GETADAP(mimd.ui.fcs.adapno);

        if (adapno >= adapters_count_g)
                return (-ENODEV);

        kioc->adapno    = adapno;
        kioc->mb_type   = MBOX_LEGACY;
        kioc->app_type  = APPTYPE_MIMD;

        switch (opcode) {

        case 0x82:

                if (subopcode == MEGAIOC_QADAPINFO) {

                        kioc->opcode    = GET_ADAP_INFO;
                        kioc->data_dir  = UIOC_RD;
                        kioc->xferlen   = sizeof(mraid_hba_info_t);

                        if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
                                return (-ENOMEM);
                }
                else {
                        con_log(CL_ANN, (KERN_WARNING
                                        "megaraid cmm: Invalid subop\n"));
                        return (-EINVAL);
                }

                break;

        case 0x81:

                kioc->opcode            = MBOX_CMD;
                kioc->xferlen           = mimd.ui.fcs.length;
                kioc->user_data_len     = kioc->xferlen;
                kioc->user_data         = mimd.ui.fcs.buffer;

                if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
                        return (-ENOMEM);

                if (mimd.outlen) kioc->data_dir  = UIOC_RD;
                if (mimd.inlen) kioc->data_dir |= UIOC_WR;

                break;

        case 0x80:

                kioc->opcode            = MBOX_CMD;
                kioc->xferlen           = (mimd.outlen > mimd.inlen) ?
                                                mimd.outlen : mimd.inlen;
                kioc->user_data_len     = kioc->xferlen;
                kioc->user_data         = mimd.data;

                if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
                        return (-ENOMEM);

                if (mimd.outlen) kioc->data_dir  = UIOC_RD;
                if (mimd.inlen) kioc->data_dir |= UIOC_WR;

                break;

        default:
                return (-EINVAL);
        }

        /*
         * If driver command, nothing else to do
         */
        if (opcode == 0x82)
                return 0;

        /*
         * This is a mailbox cmd; copy the mailbox from mimd
         */
        mbox64  = (mbox64_t *)((unsigned long)kioc->cmdbuf);
        mbox    = &mbox64->mbox32;
        memcpy(mbox, mimd.mbox, 14);

        if (mbox->cmd != MBOXCMD_PASSTHRU) {    // regular DCMD

                mbox->xferaddr  = (uint32_t)kioc->buf_paddr;

                if (kioc->data_dir & UIOC_WR) {
                        if (copy_from_user(kioc->buf_vaddr, kioc->user_data,
                                                        kioc->xferlen)) {
                                return (-EFAULT);
                        }
                }

                return 0;
        }

        /*
         * This is a regular 32-bit pthru cmd; mbox points to pthru struct.
         * Just like in above case, the beginning for memblk is treated as
         * a mailbox. The passthru will begin at next 1K boundary. And the
         * data will start 1K after that.
         */
        pthru32                 = kioc->pthru32;
        kioc->user_pthru        = &umimd->pthru;
        mbox->xferaddr          = (uint32_t)kioc->pthru32_h;

        if (copy_from_user(pthru32, kioc->user_pthru,
                        sizeof(mraid_passthru_t))) {
                return (-EFAULT);
        }

        pthru32->dataxferaddr   = kioc->buf_paddr;
        if (kioc->data_dir & UIOC_WR) {
                if (pthru32->dataxferlen > kioc->xferlen)
                        return -EINVAL;
                if (copy_from_user(kioc->buf_vaddr, kioc->user_data,
                                                pthru32->dataxferlen)) {
                        return (-EFAULT);
                }
        }

        return 0;
}

/**
 * mraid_mm_attch_buf - Attach a free dma buffer for required size
 * @adp         : Adapter softstate
 * @kioc        : kioc that the buffer needs to be attached to
 * @xferlen     : required length for buffer
 *
 * First we search for a pool with smallest buffer that is >= @xferlen. If
 * that pool has no free buffer, we will try for the next bigger size. If none
 * is available, we will try to allocate the smallest buffer that is >=
 * @xferlen and attach it the pool.
 */
static int
mraid_mm_attach_buf(mraid_mmadp_t *adp, uioc_t *kioc, int xferlen)
{
        mm_dmapool_t    *pool;
        int             right_pool = -1;
        unsigned long   flags;
        int             i;

        kioc->pool_index        = -1;
        kioc->buf_vaddr         = NULL;
        kioc->buf_paddr         = 0;
        kioc->free_buf          = 0;

        /*
         * We need xferlen amount of memory. See if we can get it from our
         * dma pools. If we don't get exact size, we will try bigger buffer
         */

        for (i = 0; i < MAX_DMA_POOLS; i++) {

                pool = &adp->dma_pool_list[i];

                if (xferlen > pool->buf_size)
                        continue;

                if (right_pool == -1)
                        right_pool = i;

                spin_lock_irqsave(&pool->lock, flags);

                if (!pool->in_use) {

                        pool->in_use            = 1;
                        kioc->pool_index        = i;
                        kioc->buf_vaddr         = pool->vaddr;
                        kioc->buf_paddr         = pool->paddr;

                        spin_unlock_irqrestore(&pool->lock, flags);
                        return 0;
                }
                else {
                        spin_unlock_irqrestore(&pool->lock, flags);
                        continue;
                }
        }

        /*
         * If xferlen doesn't match any of our pools, return error
         */
        if (right_pool == -1)
                return -EINVAL;

        /*
         * We did not get any buffer from the preallocated pool. Let us try
         * to allocate one new buffer. NOTE: This is a blocking call.
         */
        pool = &adp->dma_pool_list[right_pool];

        spin_lock_irqsave(&pool->lock, flags);

        kioc->pool_index        = right_pool;
        kioc->free_buf          = 1;
        kioc->buf_vaddr         = dma_pool_alloc(pool->handle, GFP_ATOMIC,
                                                        &kioc->buf_paddr);
        spin_unlock_irqrestore(&pool->lock, flags);

        if (!kioc->buf_vaddr)
                return -ENOMEM;

        return 0;
}

/**
 * mraid_mm_alloc_kioc - Returns a uioc_t from free list
 * @adp : Adapter softstate for this module
 *
 * The kioc_semaphore is initialized with number of kioc nodes in the
 * free kioc pool. If the kioc pool is empty, this function blocks till
 * a kioc becomes free.
 */
static uioc_t *
mraid_mm_alloc_kioc(mraid_mmadp_t *adp)
{
        uioc_t                  *kioc;
        struct list_head*       head;
        unsigned long           flags;

        down(&adp->kioc_semaphore);

        spin_lock_irqsave(&adp->kioc_pool_lock, flags);

        head = &adp->kioc_pool;

        if (list_empty(head)) {
                up(&adp->kioc_semaphore);
                spin_unlock_irqrestore(&adp->kioc_pool_lock, flags);

                con_log(CL_ANN, ("megaraid cmm: kioc list empty!\n"));
                return NULL;
        }

        kioc = list_entry(head->next, uioc_t, list);
        list_del_init(&kioc->list);

        spin_unlock_irqrestore(&adp->kioc_pool_lock, flags);

        memset((caddr_t)(unsigned long)kioc->cmdbuf, 0, sizeof(mbox64_t));
        memset((caddr_t) kioc->pthru32, 0, sizeof(mraid_passthru_t));

        kioc->buf_vaddr         = NULL;
        kioc->buf_paddr         = 0;
        kioc->pool_index        =-1;
        kioc->free_buf          = 0;
        kioc->user_data         = NULL;
        kioc->user_data_len     = 0;
        kioc->user_pthru        = NULL;
        kioc->timedout          = 0;

        return kioc;
}

/**
 * mraid_mm_dealloc_kioc - Return kioc to free pool
 * @adp         : Adapter softstate
 * @kioc        : uioc_t node to be returned to free pool
 */
static void
mraid_mm_dealloc_kioc(mraid_mmadp_t *adp, uioc_t *kioc)
{
        mm_dmapool_t    *pool;
        unsigned long   flags;

        if (kioc->pool_index != -1) {
                pool = &adp->dma_pool_list[kioc->pool_index];

                /* This routine may be called in non-isr context also */
                spin_lock_irqsave(&pool->lock, flags);

                /*
                 * While attaching the dma buffer, if we didn't get the 
                 * required buffer from the pool, we would have allocated 
                 * it at the run time and set the free_buf flag. We must 
                 * free that buffer. Otherwise, just mark that the buffer is 
                 * not in use
                 */
                if (kioc->free_buf == 1)
                        dma_pool_free(pool->handle, kioc->buf_vaddr, 
                                                        kioc->buf_paddr);
                else
                        pool->in_use = 0;

                spin_unlock_irqrestore(&pool->lock, flags);
        }

        /* Return the kioc to the free pool */
        spin_lock_irqsave(&adp->kioc_pool_lock, flags);
        list_add(&kioc->list, &adp->kioc_pool);
        spin_unlock_irqrestore(&adp->kioc_pool_lock, flags);

        /* increment the free kioc count */
        up(&adp->kioc_semaphore);

        return;
}

/**
 * lld_ioctl - Routine to issue ioctl to low level drvr
 * @adp         : The adapter handle
 * @kioc        : The ioctl packet with kernel addresses
 */
static int
lld_ioctl(mraid_mmadp_t *adp, uioc_t *kioc)
{
        int                     rval;
        struct timer_list       timer;
        struct timer_list       *tp = NULL;

        kioc->status    = -ENODATA;
        rval            = adp->issue_uioc(adp->drvr_data, kioc, IOCTL_ISSUE);

        if (rval) return rval;

        /*
         * Start the timer
         */
        if (adp->timeout > 0) {
                tp              = &timer;
                init_timer(tp);

                tp->function    = lld_timedout;
                tp->data        = (unsigned long)kioc;
                tp->expires     = jiffies + adp->timeout * HZ;

                add_timer(tp);
        }

        /*
         * Wait till the low level driver completes the ioctl. After this
         * call, the ioctl either completed successfully or timedout.
         */
        wait_event(wait_q, (kioc->status != -ENODATA));
        if (tp) {
                del_timer_sync(tp);
        }

        /*
         * If the command had timedout, we mark the controller offline
         * before returning
         */
        if (kioc->timedout) {
                adp->quiescent = 0;
        }

        return kioc->status;
}


/**
 * ioctl_done - callback from the low level driver
 * @kioc        : completed ioctl packet
 */
static void
ioctl_done(uioc_t *kioc)
{
        uint32_t        adapno;
        int             iterator;
        mraid_mmadp_t*  adapter;

        /*
         * When the kioc returns from driver, make sure it still doesn't
         * have ENODATA in status. Otherwise, driver will hang on wait_event
         * forever
         */
        if (kioc->status == -ENODATA) {
                con_log(CL_ANN, (KERN_WARNING
                        "megaraid cmm: lld didn't change status!\n"));

                kioc->status = -EINVAL;
        }

        /*
         * Check if this kioc was timedout before. If so, nobody is waiting
         * on this kioc. We don't have to wake up anybody. Instead, we just
         * have to free the kioc
         */
        if (kioc->timedout) {
                iterator        = 0;
                adapter         = NULL;
                adapno          = kioc->adapno;

                con_log(CL_ANN, ( KERN_WARNING "megaraid cmm: completed "
                                        "ioctl that was timedout before\n"));

                list_for_each_entry(adapter, &adapters_list_g, list) {
                        if (iterator++ == adapno) break;
                }

                kioc->timedout = 0;

                if (adapter) {
                        mraid_mm_dealloc_kioc( adapter, kioc );
                }
        }
        else {
                wake_up(&wait_q);
        }
}


/**
 * lld_timedout - callback from the expired timer
 * @ptr         : ioctl packet that timed out
 */
static void
lld_timedout(unsigned long ptr)
{
        uioc_t *kioc    = (uioc_t *)ptr;

        kioc->status    = -ETIME;
        kioc->timedout  = 1;

        con_log(CL_ANN, (KERN_WARNING "megaraid cmm: ioctl timed out\n"));

        wake_up(&wait_q);
}


/**
 * kioc_to_mimd - Converter from new back to old format
 * @kioc        : Kernel space IOCTL packet (successfully issued)
 * @mimd        : User space MIMD packet
 */
static int
kioc_to_mimd(uioc_t *kioc, mimd_t __user *mimd)
{
        mimd_t                  kmimd;
        uint8_t                 opcode;
        uint8_t                 subopcode;

        mbox64_t                *mbox64;
        mraid_passthru_t        __user *upthru32;
        mraid_passthru_t        *kpthru32;
        mcontroller_t           cinfo;
        mraid_hba_info_t        *hinfo;


        if (copy_from_user(&kmimd, mimd, sizeof(mimd_t)))
                return (-EFAULT);

        opcode          = kmimd.ui.fcs.opcode;
        subopcode       = kmimd.ui.fcs.subopcode;

        if (opcode == 0x82) {
                switch (subopcode) {

                case MEGAIOC_QADAPINFO:

                        hinfo = (mraid_hba_info_t *)(unsigned long)
                                        kioc->buf_vaddr;

                        hinfo_to_cinfo(hinfo, &cinfo);

                        if (copy_to_user(kmimd.data, &cinfo, sizeof(cinfo)))
                                return (-EFAULT);

                        return 0;

                default:
                        return (-EINVAL);
                }

                return 0;
        }

        mbox64 = (mbox64_t *)(unsigned long)kioc->cmdbuf;

        if (kioc->user_pthru) {

                upthru32 = kioc->user_pthru;
                kpthru32 = kioc->pthru32;

                if (copy_to_user(&upthru32->scsistatus,
                                        &kpthru32->scsistatus,
                                        sizeof(uint8_t))) {
                        return (-EFAULT);
                }
        }

        if (kioc->user_data) {
                if (copy_to_user(kioc->user_data, kioc->buf_vaddr,
                                        kioc->user_data_len)) {
                        return (-EFAULT);
                }
        }

        if (copy_to_user(&mimd->mbox[17],
                        &mbox64->mbox32.status, sizeof(uint8_t))) {
                return (-EFAULT);
        }

        return 0;
}


/**
 * hinfo_to_cinfo - Convert new format hba info into old format
 * @hinfo       : New format, more comprehensive adapter info
 * @cinfo       : Old format adapter info to support mimd_t apps
 */
static void
hinfo_to_cinfo(mraid_hba_info_t *hinfo, mcontroller_t *cinfo)
{
        if (!hinfo || !cinfo)
                return;

        cinfo->base             = hinfo->baseport;
        cinfo->irq              = hinfo->irq;
        cinfo->numldrv          = hinfo->num_ldrv;
        cinfo->pcibus           = hinfo->pci_bus;
        cinfo->pcidev           = hinfo->pci_slot;
        cinfo->pcifun           = PCI_FUNC(hinfo->pci_dev_fn);
        cinfo->pciid            = hinfo->pci_device_id;
        cinfo->pcivendor        = hinfo->pci_vendor_id;
        cinfo->pcislot          = hinfo->pci_slot;
        cinfo->uid              = hinfo->unique_id;
}


/**
 * mraid_mm_register_adp - Registration routine for low level drivers
 * @lld_adp     : Adapter object
 */
int
mraid_mm_register_adp(mraid_mmadp_t *lld_adp)
{
        mraid_mmadp_t   *adapter;
        mbox64_t        *mbox_list;
        uioc_t          *kioc;
        uint32_t        rval;
        int             i;


        if (lld_adp->drvr_type != DRVRTYPE_MBOX)
                return (-EINVAL);

        adapter = kzalloc(sizeof(mraid_mmadp_t), GFP_KERNEL);

        if (!adapter)
                return -ENOMEM;


        adapter->unique_id      = lld_adp->unique_id;
        adapter->drvr_type      = lld_adp->drvr_type;
        adapter->drvr_data      = lld_adp->drvr_data;
        adapter->pdev           = lld_adp->pdev;
        adapter->issue_uioc     = lld_adp->issue_uioc;
        adapter->timeout        = lld_adp->timeout;
        adapter->max_kioc       = lld_adp->max_kioc;
        adapter->quiescent      = 1;

        /*
         * Allocate single blocks of memory for all required kiocs,
         * mailboxes and passthru structures.
         */
        adapter->kioc_list      = kmalloc(sizeof(uioc_t) * lld_adp->max_kioc,
                                                GFP_KERNEL);
        adapter->mbox_list      = kmalloc(sizeof(mbox64_t) * lld_adp->max_kioc,
                                                GFP_KERNEL);
        adapter->pthru_dma_pool = dma_pool_create("megaraid mm pthru pool",
                                                &adapter->pdev->dev,
                                                sizeof(mraid_passthru_t),
                                                16, 0);

        if (!adapter->kioc_list || !adapter->mbox_list ||
                        !adapter->pthru_dma_pool) {

                con_log(CL_ANN, (KERN_WARNING
                        "megaraid cmm: out of memory, %s %d\n", __func__,
                        __LINE__));

                rval = (-ENOMEM);

                goto memalloc_error;
        }

        /*
         * Slice kioc_list and make a kioc_pool with the individiual kiocs
         */
        INIT_LIST_HEAD(&adapter->kioc_pool);
        spin_lock_init(&adapter->kioc_pool_lock);
        sema_init(&adapter->kioc_semaphore, lld_adp->max_kioc);

        mbox_list       = (mbox64_t *)adapter->mbox_list;

        for (i = 0; i < lld_adp->max_kioc; i++) {

                kioc            = adapter->kioc_list + i;
                kioc->cmdbuf    = (uint64_t)(unsigned long)(mbox_list + i);
                kioc->pthru32   = dma_pool_alloc(adapter->pthru_dma_pool,
                                                GFP_KERNEL, &kioc->pthru32_h);

                if (!kioc->pthru32) {

                        con_log(CL_ANN, (KERN_WARNING
                                "megaraid cmm: out of memory, %s %d\n",
                                        __func__, __LINE__));

                        rval = (-ENOMEM);

                        goto pthru_dma_pool_error;
                }

                list_add_tail(&kioc->list, &adapter->kioc_pool);
        }

        // Setup the dma pools for data buffers
        if ((rval = mraid_mm_setup_dma_pools(adapter)) != 0) {
                goto dma_pool_error;
        }

        list_add_tail(&adapter->list, &adapters_list_g);

        adapters_count_g++;

        return 0;

dma_pool_error:
        /* Do nothing */

pthru_dma_pool_error:

        for (i = 0; i < lld_adp->max_kioc; i++) {
                kioc = adapter->kioc_list + i;
                if (kioc->pthru32) {
                        dma_pool_free(adapter->pthru_dma_pool, kioc->pthru32,
                                kioc->pthru32_h);
                }
        }

memalloc_error:

        kfree(adapter->kioc_list);
        kfree(adapter->mbox_list);

        if (adapter->pthru_dma_pool)
                dma_pool_destroy(adapter->pthru_dma_pool);

        kfree(adapter);

        return rval;
}


/**
 * mraid_mm_adapter_app_handle - return the application handle for this adapter
 * @unique_id   : adapter unique identifier
 *
 * For the given driver data, locate the adapter in our global list and
 * return the corresponding handle, which is also used by applications to
 * uniquely identify an adapter.
 *
 * Return adapter handle if found in the list.
 * Return 0 if adapter could not be located, should never happen though.
 */
uint32_t
mraid_mm_adapter_app_handle(uint32_t unique_id)
{
        mraid_mmadp_t   *adapter;
        mraid_mmadp_t   *tmp;
        int             index = 0;

        list_for_each_entry_safe(adapter, tmp, &adapters_list_g, list) {

                if (adapter->unique_id == unique_id) {

                        return MKADAP(index);
                }

                index++;
        }

        return 0;
}


/**
 * mraid_mm_setup_dma_pools - Set up dma buffer pools per adapter
 * @adp : Adapter softstate
 *
 * We maintain a pool of dma buffers per each adapter. Each pool has one
 * buffer. E.g, we may have 5 dma pools - one each for 4k, 8k ... 64k buffers.
 * We have just one 4k buffer in 4k pool, one 8k buffer in 8k pool etc. We
 * dont' want to waste too much memory by allocating more buffers per each
 * pool.
 */
static int
mraid_mm_setup_dma_pools(mraid_mmadp_t *adp)
{
        mm_dmapool_t    *pool;
        int             bufsize;
        int             i;

        /*
         * Create MAX_DMA_POOLS number of pools
         */
        bufsize = MRAID_MM_INIT_BUFF_SIZE;

        for (i = 0; i < MAX_DMA_POOLS; i++){

                pool = &adp->dma_pool_list[i];

                pool->buf_size = bufsize;
                spin_lock_init(&pool->lock);

                pool->handle = dma_pool_create("megaraid mm data buffer",
                                                &adp->pdev->dev, bufsize,
                                                16, 0);

                if (!pool->handle) {
                        goto dma_pool_setup_error;
                }

                pool->vaddr = dma_pool_alloc(pool->handle, GFP_KERNEL,
                                                        &pool->paddr);

                if (!pool->vaddr)
                        goto dma_pool_setup_error;

                bufsize = bufsize * 2;
        }

        return 0;

dma_pool_setup_error:

        mraid_mm_teardown_dma_pools(adp);
        return (-ENOMEM);
}


/**
 * mraid_mm_unregister_adp - Unregister routine for low level drivers
 * @unique_id   : UID of the adpater
 *
 * Assumes no outstanding ioctls to llds.
 */
int
mraid_mm_unregister_adp(uint32_t unique_id)
{
        mraid_mmadp_t   *adapter;
        mraid_mmadp_t   *tmp;

        list_for_each_entry_safe(adapter, tmp, &adapters_list_g, list) {


                if (adapter->unique_id == unique_id) {

                        adapters_count_g--;

                        list_del_init(&adapter->list);

                        mraid_mm_free_adp_resources(adapter);

                        kfree(adapter);

                        con_log(CL_ANN, (
                                "megaraid cmm: Unregistered one adapter:%#x\n",
                                unique_id));

                        return 0;
                }
        }

        return (-ENODEV);
}

/**
 * mraid_mm_free_adp_resources - Free adapter softstate
 * @adp : Adapter softstate
 */
static void
mraid_mm_free_adp_resources(mraid_mmadp_t *adp)
{
        uioc_t  *kioc;
        int     i;

        mraid_mm_teardown_dma_pools(adp);

        for (i = 0; i < adp->max_kioc; i++) {

                kioc = adp->kioc_list + i;

                dma_pool_free(adp->pthru_dma_pool, kioc->pthru32,
                                kioc->pthru32_h);
        }

        kfree(adp->kioc_list);
        kfree(adp->mbox_list);

        dma_pool_destroy(adp->pthru_dma_pool);


        return;
}


/**
 * mraid_mm_teardown_dma_pools - Free all per adapter dma buffers
 * @adp : Adapter softstate
 */
static void
mraid_mm_teardown_dma_pools(mraid_mmadp_t *adp)
{
        int             i;
        mm_dmapool_t    *pool;

        for (i = 0; i < MAX_DMA_POOLS; i++) {

                pool = &adp->dma_pool_list[i];

                if (pool->handle) {

                        if (pool->vaddr)
                                dma_pool_free(pool->handle, pool->vaddr,
                                                        pool->paddr);

                        dma_pool_destroy(pool->handle);
                        pool->handle = NULL;
                }
        }

        return;
}

/**
 * mraid_mm_init        - Module entry point
 */
static int __init
mraid_mm_init(void)
{
        int err;

        // Announce the driver version
        con_log(CL_ANN, (KERN_INFO "megaraid cmm: %s %s\n",
                LSI_COMMON_MOD_VERSION, LSI_COMMON_MOD_EXT_VERSION));

        err = misc_register(&megaraid_mm_dev);
        if (err < 0) {
                con_log(CL_ANN, ("megaraid cmm: cannot register misc device\n"));
                return err;
        }

        init_waitqueue_head(&wait_q);

        INIT_LIST_HEAD(&adapters_list_g);

        return 0;
}


#ifdef CONFIG_COMPAT
/**
 * mraid_mm_compat_ioctl        - 32bit to 64bit ioctl conversion routine
 * @filep       : file operations pointer (ignored)
 * @cmd         : ioctl command
 * @arg         : user ioctl packet
 */
static long
mraid_mm_compat_ioctl(struct file *filep, unsigned int cmd,
                      unsigned long arg)
{
        int err;

        err = mraid_mm_ioctl(filep, cmd, arg);

        return err;
}
#endif

/**
 * mraid_mm_exit        - Module exit point
 */
static void __exit
mraid_mm_exit(void)
{
        con_log(CL_DLEVEL1 , ("exiting common mod\n"));

        misc_deregister(&megaraid_mm_dev);
}

module_init(mraid_mm_init);
module_exit(mraid_mm_exit);

/* vi: set ts=8 sw=8 tw=78: */