Adding support for MOXA ART SoC. Testing port of linux-2.6.32.60-moxart.

[linux-3.6.7-moxart.git] / drivers / staging / sep / sep_main.c

/*
 *
 *  sep_main.c - Security Processor Driver main group of functions
 *
 *  Copyright(c) 2009-2011 Intel Corporation. All rights reserved.
 *  Contributions(c) 2009-2011 Discretix. All rights reserved.
 *
 *  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; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 *  more details.
 *
 *  You should have received a copy of the GNU General Public License along with
 *  this program; if not, write to the Free Software Foundation, Inc., 59
 *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 *  CONTACTS:
 *
 *  Mark Allyn          mark.a.allyn@intel.com
 *  Jayant Mangalampalli jayant.mangalampalli@intel.com
 *
 *  CHANGES:
 *
 *  2009.06.26  Initial publish
 *  2010.09.14  Upgrade to Medfield
 *  2011.01.21  Move to sep_main.c to allow for sep_crypto.c
 *  2011.02.22  Enable kernel crypto operation
 *
 *  Please note that this driver is based on information in the Discretix
 *  CryptoCell 5.2 Driver Implementation Guide; the Discretix CryptoCell 5.2
 *  Integration Intel Medfield appendix; the Discretix CryptoCell 5.2
 *  Linux Driver Integration Guide; and the Discretix CryptoCell 5.2 System
 *  Overview and Integration Guide.
 */
/* #define DEBUG */
/* #define SEP_PERF_DEBUG */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/kdev_t.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/poll.h>
#include <linux/wait.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/ioctl.h>
#include <asm/current.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/pagemap.h>
#include <asm/cacheflush.h>
#include <linux/delay.h>
#include <linux/jiffies.h>
#include <linux/async.h>
#include <linux/crypto.h>
#include <crypto/internal/hash.h>
#include <crypto/scatterwalk.h>
#include <crypto/sha.h>
#include <crypto/md5.h>
#include <crypto/aes.h>
#include <crypto/des.h>
#include <crypto/hash.h>

#include "sep_driver_hw_defs.h"
#include "sep_driver_config.h"
#include "sep_driver_api.h"
#include "sep_dev.h"
#include "sep_crypto.h"

#define CREATE_TRACE_POINTS
#include "sep_trace_events.h"

/*
 * Let's not spend cycles iterating over message
 * area contents if debugging not enabled
 */
#ifdef DEBUG
#define sep_dump_message(sep)   _sep_dump_message(sep)
#else
#define sep_dump_message(sep)
#endif

/**
 * Currently, there is only one SEP device per platform;
 * In event platforms in the future have more than one SEP
 * device, this will be a linked list
 */

struct sep_device *sep_dev;

/**
 * sep_queue_status_remove - Removes transaction from status queue
 * @sep: SEP device
 * @sep_queue_info: pointer to status queue
 *
 * This function will remove information about transaction from the queue.
 */
void sep_queue_status_remove(struct sep_device *sep,
                                      struct sep_queue_info **queue_elem)
{
        unsigned long lck_flags;

        dev_dbg(&sep->pdev->dev, "[PID%d] sep_queue_status_remove\n",
                current->pid);

        if (!queue_elem || !(*queue_elem)) {
                dev_dbg(&sep->pdev->dev, "PID%d %s null\n",
                                        current->pid, __func__);
                return;
        }

        spin_lock_irqsave(&sep->sep_queue_lock, lck_flags);
        list_del(&(*queue_elem)->list);
        sep->sep_queue_num--;
        spin_unlock_irqrestore(&sep->sep_queue_lock, lck_flags);

        kfree(*queue_elem);
        *queue_elem = NULL;

        dev_dbg(&sep->pdev->dev, "[PID%d] sep_queue_status_remove return\n",
                current->pid);
        return;
}

/**
 * sep_queue_status_add - Adds transaction to status queue
 * @sep: SEP device
 * @opcode: transaction opcode
 * @size: input data size
 * @pid: pid of current process
 * @name: current process name
 * @name_len: length of name (current process)
 *
 * This function adds information about about transaction started to the status
 * queue.
 */
struct sep_queue_info *sep_queue_status_add(
                                                struct sep_device *sep,
                                                u32 opcode,
                                                u32 size,
                                                u32 pid,
                                                u8 *name, size_t name_len)
{
        unsigned long lck_flags;
        struct sep_queue_info *my_elem = NULL;

        my_elem = kzalloc(sizeof(struct sep_queue_info), GFP_KERNEL);

        if (!my_elem)
                return NULL;

        dev_dbg(&sep->pdev->dev, "[PID%d] kzalloc ok\n", current->pid);

        my_elem->data.opcode = opcode;
        my_elem->data.size = size;
        my_elem->data.pid = pid;

        if (name_len > TASK_COMM_LEN)
                name_len = TASK_COMM_LEN;

        memcpy(&my_elem->data.name, name, name_len);

        spin_lock_irqsave(&sep->sep_queue_lock, lck_flags);

        list_add_tail(&my_elem->list, &sep->sep_queue_status);
        sep->sep_queue_num++;

        spin_unlock_irqrestore(&sep->sep_queue_lock, lck_flags);

        return my_elem;
}

/**
 *      sep_allocate_dmatables_region - Allocates buf for the MLLI/DMA tables
 *      @sep: SEP device
 *      @dmatables_region: Destination pointer for the buffer
 *      @dma_ctx: DMA context for the transaction
 *      @table_count: Number of MLLI/DMA tables to create
 *      The buffer created will not work as-is for DMA operations,
 *      it needs to be copied over to the appropriate place in the
 *      shared area.
 */
static int sep_allocate_dmatables_region(struct sep_device *sep,
                                         void **dmatables_region,
                                         struct sep_dma_context *dma_ctx,
                                         const u32 table_count)
{
        const size_t new_len =
                SYNCHRONIC_DMA_TABLES_AREA_SIZE_BYTES - 1;

        void *tmp_region = NULL;

        dev_dbg(&sep->pdev->dev, "[PID%d] dma_ctx = 0x%p\n",
                                current->pid, dma_ctx);
        dev_dbg(&sep->pdev->dev, "[PID%d] dmatables_region = 0x%p\n",
                                current->pid, dmatables_region);

        if (!dma_ctx || !dmatables_region) {
                dev_warn(&sep->pdev->dev,
                        "[PID%d] dma context/region uninitialized\n",
                        current->pid);
                return -EINVAL;
        }

        dev_dbg(&sep->pdev->dev, "[PID%d] newlen = 0x%08zX\n",
                                current->pid, new_len);
        dev_dbg(&sep->pdev->dev, "[PID%d] oldlen = 0x%08X\n", current->pid,
                                dma_ctx->dmatables_len);
        tmp_region = kzalloc(new_len + dma_ctx->dmatables_len, GFP_KERNEL);
        if (!tmp_region) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] no mem for dma tables region\n",
                                current->pid);
                return -ENOMEM;
        }

        /* Were there any previous tables that need to be preserved ? */
        if (*dmatables_region) {
                memcpy(tmp_region, *dmatables_region, dma_ctx->dmatables_len);
                kfree(*dmatables_region);
                *dmatables_region = NULL;
        }

        *dmatables_region = tmp_region;

        dma_ctx->dmatables_len += new_len;

        return 0;
}

/**
 *      sep_wait_transaction - Used for synchronizing transactions
 *      @sep: SEP device
 */
int sep_wait_transaction(struct sep_device *sep)
{
        int error = 0;
        DEFINE_WAIT(wait);

        if (0 == test_and_set_bit(SEP_TRANSACTION_STARTED_LOCK_BIT,
                                &sep->in_use_flags)) {
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] no transactions, returning\n",
                                current->pid);
                goto end_function_setpid;
        }

        /*
         * Looping needed even for exclusive waitq entries
         * due to process wakeup latencies, previous process
         * might have already created another transaction.
         */
        for (;;) {
                /*
                 * Exclusive waitq entry, so that only one process is
                 * woken up from the queue at a time.
                 */
                prepare_to_wait_exclusive(&sep->event_transactions,
                                          &wait,
                                          TASK_INTERRUPTIBLE);
                if (0 == test_and_set_bit(SEP_TRANSACTION_STARTED_LOCK_BIT,
                                          &sep->in_use_flags)) {
                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] no transactions, breaking\n",
                                        current->pid);
                        break;
                }
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] transactions ongoing, sleeping\n",
                                current->pid);
                schedule();
                dev_dbg(&sep->pdev->dev, "[PID%d] woken up\n", current->pid);

                if (signal_pending(current)) {
                        dev_dbg(&sep->pdev->dev, "[PID%d] received signal\n",
                                                        current->pid);
                        error = -EINTR;
                        goto end_function;
                }
        }
end_function_setpid:
        /*
         * The pid_doing_transaction indicates that this process
         * now owns the facilities to perform a transaction with
         * the SEP. While this process is performing a transaction,
         * no other process who has the SEP device open can perform
         * any transactions. This method allows more than one process
         * to have the device open at any given time, which provides
         * finer granularity for device utilization by multiple
         * processes.
         */
        /* Only one process is able to progress here at a time */
        sep->pid_doing_transaction = current->pid;

end_function:
        finish_wait(&sep->event_transactions, &wait);

        return error;
}

/**
 * sep_check_transaction_owner - Checks if current process owns transaction
 * @sep: SEP device
 */
static inline int sep_check_transaction_owner(struct sep_device *sep)
{
        dev_dbg(&sep->pdev->dev, "[PID%d] transaction pid = %d\n",
                current->pid,
                sep->pid_doing_transaction);

        if ((sep->pid_doing_transaction == 0) ||
                (current->pid != sep->pid_doing_transaction)) {
                return -EACCES;
        }

        /* We own the transaction */
        return 0;
}

#ifdef DEBUG

/**
 * sep_dump_message - dump the message that is pending
 * @sep: SEP device
 * This will only print dump if DEBUG is set; it does
 * follow kernel debug print enabling
 */
static void _sep_dump_message(struct sep_device *sep)
{
        int count;

        u32 *p = sep->shared_addr;

        for (count = 0; count < 10 * 4; count += 4)
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] Word %d of the message is %x\n",
                                current->pid, count/4, *p++);
}

#endif

/**
 * sep_map_and_alloc_shared_area -allocate shared block
 * @sep: security processor
 * @size: size of shared area
 */
static int sep_map_and_alloc_shared_area(struct sep_device *sep)
{
        sep->shared_addr = dma_alloc_coherent(&sep->pdev->dev,
                sep->shared_size,
                &sep->shared_bus, GFP_KERNEL);

        if (!sep->shared_addr) {
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] shared memory dma_alloc_coherent failed\n",
                                current->pid);
                return -ENOMEM;
        }
        dev_dbg(&sep->pdev->dev,
                "[PID%d] shared_addr %zx bytes @%p (bus %llx)\n",
                                current->pid,
                                sep->shared_size, sep->shared_addr,
                                (unsigned long long)sep->shared_bus);
        return 0;
}

/**
 * sep_unmap_and_free_shared_area - free shared block
 * @sep: security processor
 */
static void sep_unmap_and_free_shared_area(struct sep_device *sep)
{
        dma_free_coherent(&sep->pdev->dev, sep->shared_size,
                                sep->shared_addr, sep->shared_bus);
}

#ifdef DEBUG

/**
 * sep_shared_bus_to_virt - convert bus/virt addresses
 * @sep: pointer to struct sep_device
 * @bus_address: address to convert
 *
 * Returns virtual address inside the shared area according
 * to the bus address.
 */
static void *sep_shared_bus_to_virt(struct sep_device *sep,
                                                dma_addr_t bus_address)
{
        return sep->shared_addr + (bus_address - sep->shared_bus);
}

#endif

/**
 * sep_open - device open method
 * @inode: inode of SEP device
 * @filp: file handle to SEP device
 *
 * Open method for the SEP device. Called when userspace opens
 * the SEP device node.
 *
 * Returns zero on success otherwise an error code.
 */
static int sep_open(struct inode *inode, struct file *filp)
{
        struct sep_device *sep;
        struct sep_private_data *priv;

        dev_dbg(&sep_dev->pdev->dev, "[PID%d] open\n", current->pid);

        if (filp->f_flags & O_NONBLOCK)
                return -ENOTSUPP;

        /*
         * Get the SEP device structure and use it for the
         * private_data field in filp for other methods
         */

        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
        if (!priv)
                return -ENOMEM;

        sep = sep_dev;
        priv->device = sep;
        filp->private_data = priv;

        dev_dbg(&sep_dev->pdev->dev, "[PID%d] priv is 0x%p\n",
                                        current->pid, priv);

        /* Anyone can open; locking takes place at transaction level */
        return 0;
}

/**
 * sep_free_dma_table_data_handler - free DMA table
 * @sep: pointer to struct sep_device
 * @dma_ctx: dma context
 *
 * Handles the request to free DMA table for synchronic actions
 */
int sep_free_dma_table_data_handler(struct sep_device *sep,
                                           struct sep_dma_context **dma_ctx)
{
        int count;
        int dcb_counter;
        /* Pointer to the current dma_resource struct */
        struct sep_dma_resource *dma;

        dev_dbg(&sep->pdev->dev,
                "[PID%d] sep_free_dma_table_data_handler\n",
                        current->pid);

        if (!dma_ctx || !(*dma_ctx)) {
                /* No context or context already freed */
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] no DMA context or context already freed\n",
                                current->pid);

                return 0;
        }

        dev_dbg(&sep->pdev->dev, "[PID%d] (*dma_ctx)->nr_dcb_creat 0x%x\n",
                                        current->pid,
                                        (*dma_ctx)->nr_dcb_creat);

        for (dcb_counter = 0;
             dcb_counter < (*dma_ctx)->nr_dcb_creat; dcb_counter++) {
                dma = &(*dma_ctx)->dma_res_arr[dcb_counter];

                /* Unmap and free input map array */
                if (dma->in_map_array) {
                        for (count = 0; count < dma->in_num_pages; count++) {
                                dma_unmap_page(&sep->pdev->dev,
                                        dma->in_map_array[count].dma_addr,
                                        dma->in_map_array[count].size,
                                        DMA_TO_DEVICE);
                        }
                        kfree(dma->in_map_array);
                }

                /**
                 * Output is handled different. If
                 * this was a secure dma into restricted memory,
                 * then we skip this step altogether as restricted
                 * memory is not available to the o/s at all.
                 */
                if (((*dma_ctx)->secure_dma == false) &&
                        (dma->out_map_array)) {

                        for (count = 0; count < dma->out_num_pages; count++) {
                                dma_unmap_page(&sep->pdev->dev,
                                        dma->out_map_array[count].dma_addr,
                                        dma->out_map_array[count].size,
                                        DMA_FROM_DEVICE);
                        }
                        kfree(dma->out_map_array);
                }

                /* Free page cache for output */
                if (dma->in_page_array) {
                        for (count = 0; count < dma->in_num_pages; count++) {
                                flush_dcache_page(dma->in_page_array[count]);
                                page_cache_release(dma->in_page_array[count]);
                        }
                        kfree(dma->in_page_array);
                }

                /* Again, we do this only for non secure dma */
                if (((*dma_ctx)->secure_dma == false) &&
                        (dma->out_page_array)) {

                        for (count = 0; count < dma->out_num_pages; count++) {
                                if (!PageReserved(dma->out_page_array[count]))

                                        SetPageDirty(dma->
                                        out_page_array[count]);

                                flush_dcache_page(dma->out_page_array[count]);
                                page_cache_release(dma->out_page_array[count]);
                        }
                        kfree(dma->out_page_array);
                }

                /**
                 * Note that here we use in_map_num_entries because we
                 * don't have a page array; the page array is generated
                 * only in the lock_user_pages, which is not called
                 * for kernel crypto, which is what the sg (scatter gather
                 * is used for exclusively)
                 */
                if (dma->src_sg) {
                        dma_unmap_sg(&sep->pdev->dev, dma->src_sg,
                                dma->in_map_num_entries, DMA_TO_DEVICE);
                        dma->src_sg = NULL;
                }

                if (dma->dst_sg) {
                        dma_unmap_sg(&sep->pdev->dev, dma->dst_sg,
                                dma->in_map_num_entries, DMA_FROM_DEVICE);
                        dma->dst_sg = NULL;
                }

                /* Reset all the values */
                dma->in_page_array = NULL;
                dma->out_page_array = NULL;
                dma->in_num_pages = 0;
                dma->out_num_pages = 0;
                dma->in_map_array = NULL;
                dma->out_map_array = NULL;
                dma->in_map_num_entries = 0;
                dma->out_map_num_entries = 0;
        }

        (*dma_ctx)->nr_dcb_creat = 0;
        (*dma_ctx)->num_lli_tables_created = 0;

        kfree(*dma_ctx);
        *dma_ctx = NULL;

        dev_dbg(&sep->pdev->dev,
                "[PID%d] sep_free_dma_table_data_handler end\n",
                        current->pid);

        return 0;
}

/**
 * sep_end_transaction_handler - end transaction
 * @sep: pointer to struct sep_device
 * @dma_ctx: DMA context
 * @call_status: Call status
 *
 * This API handles the end transaction request.
 */
static int sep_end_transaction_handler(struct sep_device *sep,
                                       struct sep_dma_context **dma_ctx,
                                       struct sep_call_status *call_status,
                                       struct sep_queue_info **my_queue_elem)
{
        dev_dbg(&sep->pdev->dev, "[PID%d] ending transaction\n", current->pid);

        /*
         * Extraneous transaction clearing would mess up PM
         * device usage counters and SEP would get suspended
         * just before we send a command to SEP in the next
         * transaction
         * */
        if (sep_check_transaction_owner(sep)) {
                dev_dbg(&sep->pdev->dev, "[PID%d] not transaction owner\n",
                                                current->pid);
                return 0;
        }

        /* Update queue status */
        sep_queue_status_remove(sep, my_queue_elem);

        /* Check that all the DMA resources were freed */
        if (dma_ctx)
                sep_free_dma_table_data_handler(sep, dma_ctx);

        /* Reset call status for next transaction */
        if (call_status)
                call_status->status = 0;

        /* Clear the message area to avoid next transaction reading
         * sensitive results from previous transaction */
        memset(sep->shared_addr, 0,
               SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES);

        /* start suspend delay */
#ifdef SEP_ENABLE_RUNTIME_PM
        if (sep->in_use) {
                sep->in_use = 0;
                pm_runtime_mark_last_busy(&sep->pdev->dev);
                pm_runtime_put_autosuspend(&sep->pdev->dev);
        }
#endif

        clear_bit(SEP_WORKING_LOCK_BIT, &sep->in_use_flags);
        sep->pid_doing_transaction = 0;

        /* Now it's safe for next process to proceed */
        dev_dbg(&sep->pdev->dev, "[PID%d] waking up next transaction\n",
                                        current->pid);
        clear_bit(SEP_TRANSACTION_STARTED_LOCK_BIT, &sep->in_use_flags);
        wake_up(&sep->event_transactions);

        return 0;
}


/**
 * sep_release - close a SEP device
 * @inode: inode of SEP device
 * @filp: file handle being closed
 *
 * Called on the final close of a SEP device.
 */
static int sep_release(struct inode *inode, struct file *filp)
{
        struct sep_private_data * const private_data = filp->private_data;
        struct sep_call_status *call_status = &private_data->call_status;
        struct sep_device *sep = private_data->device;
        struct sep_dma_context **dma_ctx = &private_data->dma_ctx;
        struct sep_queue_info **my_queue_elem = &private_data->my_queue_elem;

        dev_dbg(&sep->pdev->dev, "[PID%d] release\n", current->pid);

        sep_end_transaction_handler(sep, dma_ctx, call_status,
                my_queue_elem);

        kfree(filp->private_data);

        return 0;
}

/**
 * sep_mmap -  maps the shared area to user space
 * @filp: pointer to struct file
 * @vma: pointer to vm_area_struct
 *
 * Called on an mmap of our space via the normal SEP device
 */
static int sep_mmap(struct file *filp, struct vm_area_struct *vma)
{
        struct sep_private_data * const private_data = filp->private_data;
        struct sep_call_status *call_status = &private_data->call_status;
        struct sep_device *sep = private_data->device;
        struct sep_queue_info **my_queue_elem = &private_data->my_queue_elem;
        dma_addr_t bus_addr;
        unsigned long error = 0;

        dev_dbg(&sep->pdev->dev, "[PID%d] sep_mmap\n", current->pid);

        /* Set the transaction busy (own the device) */
        /*
         * Problem for multithreaded applications is that here we're
         * possibly going to sleep while holding a write lock on
         * current->mm->mmap_sem, which will cause deadlock for ongoing
         * transaction trying to create DMA tables
         */
        error = sep_wait_transaction(sep);
        if (error)
                /* Interrupted by signal, don't clear transaction */
                goto end_function;

        /* Clear the message area to avoid next transaction reading
         * sensitive results from previous transaction */
        memset(sep->shared_addr, 0,
               SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES);

        /*
         * Check that the size of the mapped range is as the size of the message
         * shared area
         */
        if ((vma->vm_end - vma->vm_start) > SEP_DRIVER_MMMAP_AREA_SIZE) {
                error = -EINVAL;
                goto end_function_with_error;
        }

        dev_dbg(&sep->pdev->dev, "[PID%d] shared_addr is %p\n",
                                        current->pid, sep->shared_addr);

        /* Get bus address */
        bus_addr = sep->shared_bus;

        if (remap_pfn_range(vma, vma->vm_start, bus_addr >> PAGE_SHIFT,
                vma->vm_end - vma->vm_start, vma->vm_page_prot)) {
                dev_dbg(&sep->pdev->dev, "[PID%d] remap_page_range failed\n",
                                                current->pid);
                error = -EAGAIN;
                goto end_function_with_error;
        }

        /* Update call status */
        set_bit(SEP_LEGACY_MMAP_DONE_OFFSET, &call_status->status);

        goto end_function;

end_function_with_error:
        /* Clear our transaction */
        sep_end_transaction_handler(sep, NULL, call_status,
                my_queue_elem);

end_function:
        return error;
}

/**
 * sep_poll - poll handler
 * @filp:       pointer to struct file
 * @wait:       pointer to poll_table
 *
 * Called by the OS when the kernel is asked to do a poll on
 * a SEP file handle.
 */
static unsigned int sep_poll(struct file *filp, poll_table *wait)
{
        struct sep_private_data * const private_data = filp->private_data;
        struct sep_call_status *call_status = &private_data->call_status;
        struct sep_device *sep = private_data->device;
        u32 mask = 0;
        u32 retval = 0;
        u32 retval2 = 0;
        unsigned long lock_irq_flag;

        /* Am I the process that owns the transaction? */
        if (sep_check_transaction_owner(sep)) {
                dev_dbg(&sep->pdev->dev, "[PID%d] poll pid not owner\n",
                                                current->pid);
                mask = POLLERR;
                goto end_function;
        }

        /* Check if send command or send_reply were activated previously */
        if (0 == test_bit(SEP_LEGACY_SENDMSG_DONE_OFFSET,
                          &call_status->status)) {
                dev_warn(&sep->pdev->dev, "[PID%d] sendmsg not called\n",
                                                current->pid);
                mask = POLLERR;
                goto end_function;
        }


        /* Add the event to the polling wait table */
        dev_dbg(&sep->pdev->dev, "[PID%d] poll: calling wait sep_event\n",
                                        current->pid);

        poll_wait(filp, &sep->event_interrupt, wait);

        dev_dbg(&sep->pdev->dev,
                "[PID%d] poll: send_ct is %lx reply ct is %lx\n",
                        current->pid, sep->send_ct, sep->reply_ct);

        /* Check if error occurred during poll */
        retval2 = sep_read_reg(sep, HW_HOST_SEP_HOST_GPR3_REG_ADDR);
        if ((retval2 != 0x0) && (retval2 != 0x8)) {
                dev_dbg(&sep->pdev->dev, "[PID%d] poll; poll error %x\n",
                                                current->pid, retval2);
                mask |= POLLERR;
                goto end_function;
        }

        spin_lock_irqsave(&sep->snd_rply_lck, lock_irq_flag);

        if (sep->send_ct == sep->reply_ct) {
                spin_unlock_irqrestore(&sep->snd_rply_lck, lock_irq_flag);
                retval = sep_read_reg(sep, HW_HOST_SEP_HOST_GPR2_REG_ADDR);
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] poll: data ready check (GPR2)  %x\n",
                                current->pid, retval);

                /* Check if printf request  */
                if ((retval >> 30) & 0x1) {
                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] poll: SEP printf request\n",
                                        current->pid);
                        goto end_function;
                }

                /* Check if the this is SEP reply or request */
                if (retval >> 31) {
                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] poll: SEP request\n",
                                        current->pid);
                } else {
                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] poll: normal return\n",
                                        current->pid);
                        sep_dump_message(sep);
                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] poll; SEP reply POLLIN|POLLRDNORM\n",
                                        current->pid);
                        mask |= POLLIN | POLLRDNORM;
                }
                set_bit(SEP_LEGACY_POLL_DONE_OFFSET, &call_status->status);
        } else {
                spin_unlock_irqrestore(&sep->snd_rply_lck, lock_irq_flag);
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] poll; no reply; returning mask of 0\n",
                                current->pid);
                mask = 0;
        }

end_function:
        return mask;
}

/**
 * sep_time_address - address in SEP memory of time
 * @sep: SEP device we want the address from
 *
 * Return the address of the two dwords in memory used for time
 * setting.
 */
static u32 *sep_time_address(struct sep_device *sep)
{
        return sep->shared_addr +
                SEP_DRIVER_SYSTEM_TIME_MEMORY_OFFSET_IN_BYTES;
}

/**
 * sep_set_time - set the SEP time
 * @sep: the SEP we are setting the time for
 *
 * Calculates time and sets it at the predefined address.
 * Called with the SEP mutex held.
 */
static unsigned long sep_set_time(struct sep_device *sep)
{
        struct timeval time;
        u32 *time_addr; /* Address of time as seen by the kernel */


        do_gettimeofday(&time);

        /* Set value in the SYSTEM MEMORY offset */
        time_addr = sep_time_address(sep);

        time_addr[0] = SEP_TIME_VAL_TOKEN;
        time_addr[1] = time.tv_sec;

        dev_dbg(&sep->pdev->dev, "[PID%d] time.tv_sec is %lu\n",
                                        current->pid, time.tv_sec);
        dev_dbg(&sep->pdev->dev, "[PID%d] time_addr is %p\n",
                                        current->pid, time_addr);
        dev_dbg(&sep->pdev->dev, "[PID%d] sep->shared_addr is %p\n",
                                        current->pid, sep->shared_addr);

        return time.tv_sec;
}

/**
 * sep_send_command_handler - kick off a command
 * @sep: SEP being signalled
 *
 * This function raises interrupt to SEP that signals that is has a new
 * command from the host
 *
 * Note that this function does fall under the ioctl lock
 */
int sep_send_command_handler(struct sep_device *sep)
{
        unsigned long lock_irq_flag;
        u32 *msg_pool;
        int error = 0;

        /* Basic sanity check; set msg pool to start of shared area */
        msg_pool = (u32 *)sep->shared_addr;
        msg_pool += 2;

        /* Look for start msg token */
        if (*msg_pool != SEP_START_MSG_TOKEN) {
                dev_warn(&sep->pdev->dev, "start message token not present\n");
                error = -EPROTO;
                goto end_function;
        }

        /* Do we have a reasonable size? */
        msg_pool += 1;
        if ((*msg_pool < 2) ||
                (*msg_pool > SEP_DRIVER_MAX_MESSAGE_SIZE_IN_BYTES)) {

                dev_warn(&sep->pdev->dev, "invalid message size\n");
                error = -EPROTO;
                goto end_function;
        }

        /* Does the command look reasonable? */
        msg_pool += 1;
        if (*msg_pool < 2) {
                dev_warn(&sep->pdev->dev, "invalid message opcode\n");
                error = -EPROTO;
                goto end_function;
        }

#if defined(CONFIG_PM_RUNTIME) && defined(SEP_ENABLE_RUNTIME_PM)
        dev_dbg(&sep->pdev->dev, "[PID%d] before pm sync status 0x%X\n",
                                        current->pid,
                                        sep->pdev->dev.power.runtime_status);
        sep->in_use = 1; /* device is about to be used */
        pm_runtime_get_sync(&sep->pdev->dev);
#endif

        if (test_and_set_bit(SEP_WORKING_LOCK_BIT, &sep->in_use_flags)) {
                error = -EPROTO;
                goto end_function;
        }
        sep->in_use = 1; /* device is about to be used */
        sep_set_time(sep);

        sep_dump_message(sep);

        /* Update counter */
        spin_lock_irqsave(&sep->snd_rply_lck, lock_irq_flag);
        sep->send_ct++;
        spin_unlock_irqrestore(&sep->snd_rply_lck, lock_irq_flag);

        dev_dbg(&sep->pdev->dev,
                "[PID%d] sep_send_command_handler send_ct %lx reply_ct %lx\n",
                        current->pid, sep->send_ct, sep->reply_ct);

        /* Send interrupt to SEP */
        sep_write_reg(sep, HW_HOST_HOST_SEP_GPR0_REG_ADDR, 0x2);

end_function:
        return error;
}

/**
 *      sep_crypto_dma -
 *      @sep: pointer to struct sep_device
 *      @sg: pointer to struct scatterlist
 *      @direction:
 *      @dma_maps: pointer to place a pointer to array of dma maps
 *       This is filled in; anything previous there will be lost
 *       The structure for dma maps is sep_dma_map
 *      @returns number of dma maps on success; negative on error
 *
 *      This creates the dma table from the scatterlist
 *      It is used only for kernel crypto as it works with scatterlists
 *      representation of data buffers
 *
 */
static int sep_crypto_dma(
        struct sep_device *sep,
        struct scatterlist *sg,
        struct sep_dma_map **dma_maps,
        enum dma_data_direction direction)
{
        struct scatterlist *temp_sg;

        u32 count_segment;
        u32 count_mapped;
        struct sep_dma_map *sep_dma;
        int ct1;

        if (sg->length == 0)
                return 0;

        /* Count the segments */
        temp_sg = sg;
        count_segment = 0;
        while (temp_sg) {
                count_segment += 1;
                temp_sg = scatterwalk_sg_next(temp_sg);
        }
        dev_dbg(&sep->pdev->dev,
                "There are (hex) %x segments in sg\n", count_segment);

        /* DMA map segments */
        count_mapped = dma_map_sg(&sep->pdev->dev, sg,
                count_segment, direction);

        dev_dbg(&sep->pdev->dev,
                "There are (hex) %x maps in sg\n", count_mapped);

        if (count_mapped == 0) {
                dev_dbg(&sep->pdev->dev, "Cannot dma_map_sg\n");
                return -ENOMEM;
        }

        sep_dma = kmalloc(sizeof(struct sep_dma_map) *
                count_mapped, GFP_ATOMIC);

        if (sep_dma == NULL) {
                dev_dbg(&sep->pdev->dev, "Cannot allocate dma_maps\n");
                return -ENOMEM;
        }

        for_each_sg(sg, temp_sg, count_mapped, ct1) {
                sep_dma[ct1].dma_addr = sg_dma_address(temp_sg);
                sep_dma[ct1].size = sg_dma_len(temp_sg);
                dev_dbg(&sep->pdev->dev, "(all hex) map %x dma %lx len %lx\n",
                        ct1, (unsigned long)sep_dma[ct1].dma_addr,
                        (unsigned long)sep_dma[ct1].size);
                }

        *dma_maps = sep_dma;
        return count_mapped;

}

/**
 *      sep_crypto_lli -
 *      @sep: pointer to struct sep_device
 *      @sg: pointer to struct scatterlist
 *      @data_size: total data size
 *      @direction:
 *      @dma_maps: pointer to place a pointer to array of dma maps
 *       This is filled in; anything previous there will be lost
 *       The structure for dma maps is sep_dma_map
 *      @lli_maps: pointer to place a pointer to array of lli maps
 *       This is filled in; anything previous there will be lost
 *       The structure for dma maps is sep_dma_map
 *      @returns number of dma maps on success; negative on error
 *
 *      This creates the LLI table from the scatterlist
 *      It is only used for kernel crypto as it works exclusively
 *      with scatterlists (struct scatterlist) representation of
 *      data buffers
 */
static int sep_crypto_lli(
        struct sep_device *sep,
        struct scatterlist *sg,
        struct sep_dma_map **maps,
        struct sep_lli_entry **llis,
        u32 data_size,
        enum dma_data_direction direction)
{

        int ct1;
        struct sep_lli_entry *sep_lli;
        struct sep_dma_map *sep_map;

        int nbr_ents;

        nbr_ents = sep_crypto_dma(sep, sg, maps, direction);
        if (nbr_ents <= 0) {
                dev_dbg(&sep->pdev->dev, "crypto_dma failed %x\n",
                        nbr_ents);
                return nbr_ents;
        }

        sep_map = *maps;

        sep_lli = kmalloc(sizeof(struct sep_lli_entry) * nbr_ents, GFP_ATOMIC);

        if (sep_lli == NULL) {
                dev_dbg(&sep->pdev->dev, "Cannot allocate lli_maps\n");

                kfree(*maps);
                *maps = NULL;
                return -ENOMEM;
        }

        for (ct1 = 0; ct1 < nbr_ents; ct1 += 1) {
                sep_lli[ct1].bus_address = (u32)sep_map[ct1].dma_addr;

                /* Maximum for page is total data size */
                if (sep_map[ct1].size > data_size)
                        sep_map[ct1].size = data_size;

                sep_lli[ct1].block_size = (u32)sep_map[ct1].size;
        }

        *llis = sep_lli;
        return nbr_ents;
}

/**
 *      sep_lock_kernel_pages - map kernel pages for DMA
 *      @sep: pointer to struct sep_device
 *      @kernel_virt_addr: address of data buffer in kernel
 *      @data_size: size of data
 *      @lli_array_ptr: lli array
 *      @in_out_flag: input into device or output from device
 *
 *      This function locks all the physical pages of the kernel virtual buffer
 *      and construct a basic lli  array, where each entry holds the physical
 *      page address and the size that application data holds in this page
 *      This function is used only during kernel crypto mod calls from within
 *      the kernel (when ioctl is not used)
 *
 *      This is used only for kernel crypto. Kernel pages
 *      are handled differently as they are done via
 *      scatter gather lists (struct scatterlist)
 */
static int sep_lock_kernel_pages(struct sep_device *sep,
        unsigned long kernel_virt_addr,
        u32 data_size,
        struct sep_lli_entry **lli_array_ptr,
        int in_out_flag,
        struct sep_dma_context *dma_ctx)

{
        u32 num_pages;
        struct scatterlist *sg;

        /* Array of lli */
        struct sep_lli_entry *lli_array;
        /* Map array */
        struct sep_dma_map *map_array;

        enum dma_data_direction direction;

        lli_array = NULL;
        map_array = NULL;

        if (in_out_flag == SEP_DRIVER_IN_FLAG) {
                direction = DMA_TO_DEVICE;
                sg = dma_ctx->src_sg;
        } else {
                direction = DMA_FROM_DEVICE;
                sg = dma_ctx->dst_sg;
        }

        num_pages = sep_crypto_lli(sep, sg, &map_array, &lli_array,
                data_size, direction);

        if (num_pages <= 0) {
                dev_dbg(&sep->pdev->dev, "sep_crypto_lli returned error %x\n",
                        num_pages);
                return -ENOMEM;
        }

        /* Put mapped kernel sg into kernel resource array */

        /* Set output params according to the in_out flag */
        if (in_out_flag == SEP_DRIVER_IN_FLAG) {
                *lli_array_ptr = lli_array;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_num_pages =
                                                                num_pages;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_page_array =
                                                                NULL;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_map_array =
                                                                map_array;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_map_num_entries =
                                                                num_pages;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].src_sg =
                        dma_ctx->src_sg;
        } else {
                *lli_array_ptr = lli_array;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_num_pages =
                                                                num_pages;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_page_array =
                                                                NULL;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_map_array =
                                                                map_array;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].
                                        out_map_num_entries = num_pages;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].dst_sg =
                        dma_ctx->dst_sg;
        }

        return 0;
}

/**
 * sep_lock_user_pages - lock and map user pages for DMA
 * @sep: pointer to struct sep_device
 * @app_virt_addr: user memory data buffer
 * @data_size: size of data buffer
 * @lli_array_ptr: lli array
 * @in_out_flag: input or output to device
 *
 * This function locks all the physical pages of the application
 * virtual buffer and construct a basic lli  array, where each entry
 * holds the physical page address and the size that application
 * data holds in this physical pages
 */
static int sep_lock_user_pages(struct sep_device *sep,
        u32 app_virt_addr,
        u32 data_size,
        struct sep_lli_entry **lli_array_ptr,
        int in_out_flag,
        struct sep_dma_context *dma_ctx)

{
        int error = 0;
        u32 count;
        int result;
        /* The the page of the end address of the user space buffer */
        u32 end_page;
        /* The page of the start address of the user space buffer */
        u32 start_page;
        /* The range in pages */
        u32 num_pages;
        /* Array of pointers to page */
        struct page **page_array;
        /* Array of lli */
        struct sep_lli_entry *lli_array;
        /* Map array */
        struct sep_dma_map *map_array;

        /* Set start and end pages and num pages */
        end_page = (app_virt_addr + data_size - 1) >> PAGE_SHIFT;
        start_page = app_virt_addr >> PAGE_SHIFT;
        num_pages = end_page - start_page + 1;

        dev_dbg(&sep->pdev->dev,
                "[PID%d] lock user pages app_virt_addr is %x\n",
                        current->pid, app_virt_addr);

        dev_dbg(&sep->pdev->dev, "[PID%d] data_size is (hex) %x\n",
                                        current->pid, data_size);
        dev_dbg(&sep->pdev->dev, "[PID%d] start_page is (hex) %x\n",
                                        current->pid, start_page);
        dev_dbg(&sep->pdev->dev, "[PID%d] end_page is (hex) %x\n",
                                        current->pid, end_page);
        dev_dbg(&sep->pdev->dev, "[PID%d] num_pages is (hex) %x\n",
                                        current->pid, num_pages);

        /* Allocate array of pages structure pointers */
        page_array = kmalloc(sizeof(struct page *) * num_pages, GFP_ATOMIC);
        if (!page_array) {
                error = -ENOMEM;
                goto end_function;
        }
        map_array = kmalloc(sizeof(struct sep_dma_map) * num_pages, GFP_ATOMIC);
        if (!map_array) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] kmalloc for map_array failed\n",
                                current->pid);
                error = -ENOMEM;
                goto end_function_with_error1;
        }

        lli_array = kmalloc(sizeof(struct sep_lli_entry) * num_pages,
                GFP_ATOMIC);

        if (!lli_array) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] kmalloc for lli_array failed\n",
                                current->pid);
                error = -ENOMEM;
                goto end_function_with_error2;
        }

        /* Convert the application virtual address into a set of physical */
        down_read(&current->mm->mmap_sem);
        result = get_user_pages(current, current->mm, app_virt_addr,
                num_pages,
                ((in_out_flag == SEP_DRIVER_IN_FLAG) ? 0 : 1),
                0, page_array, NULL);

        up_read(&current->mm->mmap_sem);

        /* Check the number of pages locked - if not all then exit with error */
        if (result != num_pages) {
                dev_warn(&sep->pdev->dev,
                        "[PID%d] not all pages locked by get_user_pages, "
                        "result 0x%X, num_pages 0x%X\n",
                                current->pid, result, num_pages);
                error = -ENOMEM;
                goto end_function_with_error3;
        }

        dev_dbg(&sep->pdev->dev, "[PID%d] get_user_pages succeeded\n",
                                        current->pid);

        /*
         * Fill the array using page array data and
         * map the pages - this action will also flush the cache as needed
         */
        for (count = 0; count < num_pages; count++) {
                /* Fill the map array */
                map_array[count].dma_addr =
                        dma_map_page(&sep->pdev->dev, page_array[count],
                        0, PAGE_SIZE, DMA_BIDIRECTIONAL);

                map_array[count].size = PAGE_SIZE;

                /* Fill the lli array entry */
                lli_array[count].bus_address = (u32)map_array[count].dma_addr;
                lli_array[count].block_size = PAGE_SIZE;

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] lli_array[%x].bus_address is %08lx, "
                        "lli_array[%x].block_size is (hex) %x\n", current->pid,
                        count, (unsigned long)lli_array[count].bus_address,
                        count, lli_array[count].block_size);
        }

        /* Check the offset for the first page */
        lli_array[0].bus_address =
                lli_array[0].bus_address + (app_virt_addr & (~PAGE_MASK));

        /* Check that not all the data is in the first page only */
        if ((PAGE_SIZE - (app_virt_addr & (~PAGE_MASK))) >= data_size)
                lli_array[0].block_size = data_size;
        else
                lli_array[0].block_size =
                        PAGE_SIZE - (app_virt_addr & (~PAGE_MASK));

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] After check if page 0 has all data\n",
                        current->pid);
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] lli_array[0].bus_address is (hex) %08lx, "
                        "lli_array[0].block_size is (hex) %x\n",
                        current->pid,
                        (unsigned long)lli_array[0].bus_address,
                        lli_array[0].block_size);


        /* Check the size of the last page */
        if (num_pages > 1) {
                lli_array[num_pages - 1].block_size =
                        (app_virt_addr + data_size) & (~PAGE_MASK);
                if (lli_array[num_pages - 1].block_size == 0)
                        lli_array[num_pages - 1].block_size = PAGE_SIZE;

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] After last page size adjustment\n",
                        current->pid);
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] lli_array[%x].bus_address is (hex) %08lx, "
                        "lli_array[%x].block_size is (hex) %x\n",
                        current->pid,
                        num_pages - 1,
                        (unsigned long)lli_array[num_pages - 1].bus_address,
                        num_pages - 1,
                        lli_array[num_pages - 1].block_size);
        }

        /* Set output params according to the in_out flag */
        if (in_out_flag == SEP_DRIVER_IN_FLAG) {
                *lli_array_ptr = lli_array;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_num_pages =
                                                                num_pages;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_page_array =
                                                                page_array;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_map_array =
                                                                map_array;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_map_num_entries =
                                                                num_pages;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].src_sg = NULL;
        } else {
                *lli_array_ptr = lli_array;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_num_pages =
                                                                num_pages;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_page_array =
                                                                page_array;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_map_array =
                                                                map_array;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].
                                        out_map_num_entries = num_pages;
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].dst_sg = NULL;
        }
        goto end_function;

end_function_with_error3:
        /* Free lli array */
        kfree(lli_array);

end_function_with_error2:
        kfree(map_array);

end_function_with_error1:
        /* Free page array */
        kfree(page_array);

end_function:
        return error;
}

/**
 *      sep_lli_table_secure_dma - get lli array for IMR addresses
 *      @sep: pointer to struct sep_device
 *      @app_virt_addr: user memory data buffer
 *      @data_size: size of data buffer
 *      @lli_array_ptr: lli array
 *      @in_out_flag: not used
 *      @dma_ctx: pointer to struct sep_dma_context
 *
 *      This function creates lli tables for outputting data to
 *      IMR memory, which is memory that cannot be accessed by the
 *      the x86 processor.
 */
static int sep_lli_table_secure_dma(struct sep_device *sep,
        u32 app_virt_addr,
        u32 data_size,
        struct sep_lli_entry **lli_array_ptr,
        int in_out_flag,
        struct sep_dma_context *dma_ctx)

{
        int error = 0;
        u32 count;
        /* The the page of the end address of the user space buffer */
        u32 end_page;
        /* The page of the start address of the user space buffer */
        u32 start_page;
        /* The range in pages */
        u32 num_pages;
        /* Array of lli */
        struct sep_lli_entry *lli_array;

        /* Set start and end pages and num pages */
        end_page = (app_virt_addr + data_size - 1) >> PAGE_SHIFT;
        start_page = app_virt_addr >> PAGE_SHIFT;
        num_pages = end_page - start_page + 1;

        dev_dbg(&sep->pdev->dev,
                "[PID%d] lock user pages  app_virt_addr is %x\n",
                current->pid, app_virt_addr);

        dev_dbg(&sep->pdev->dev, "[PID%d] data_size is (hex) %x\n",
                current->pid, data_size);
        dev_dbg(&sep->pdev->dev, "[PID%d] start_page is (hex) %x\n",
                current->pid, start_page);
        dev_dbg(&sep->pdev->dev, "[PID%d] end_page is (hex) %x\n",
                current->pid, end_page);
        dev_dbg(&sep->pdev->dev, "[PID%d] num_pages is (hex) %x\n",
                current->pid, num_pages);

        lli_array = kmalloc(sizeof(struct sep_lli_entry) * num_pages,
                GFP_ATOMIC);

        if (!lli_array) {
                dev_warn(&sep->pdev->dev,
                        "[PID%d] kmalloc for lli_array failed\n",
                        current->pid);
                return -ENOMEM;
        }

        /*
         * Fill the lli_array
         */
        start_page = start_page << PAGE_SHIFT;
        for (count = 0; count < num_pages; count++) {
                /* Fill the lli array entry */
                lli_array[count].bus_address = start_page;
                lli_array[count].block_size = PAGE_SIZE;

                start_page += PAGE_SIZE;

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] lli_array[%x].bus_address is %08lx, "
                        "lli_array[%x].block_size is (hex) %x\n",
                        current->pid,
                        count, (unsigned long)lli_array[count].bus_address,
                        count, lli_array[count].block_size);
        }

        /* Check the offset for the first page */
        lli_array[0].bus_address =
                lli_array[0].bus_address + (app_virt_addr & (~PAGE_MASK));

        /* Check that not all the data is in the first page only */
        if ((PAGE_SIZE - (app_virt_addr & (~PAGE_MASK))) >= data_size)
                lli_array[0].block_size = data_size;
        else
                lli_array[0].block_size =
                        PAGE_SIZE - (app_virt_addr & (~PAGE_MASK));

        dev_dbg(&sep->pdev->dev,
                "[PID%d] After check if page 0 has all data\n"
                "lli_array[0].bus_address is (hex) %08lx, "
                "lli_array[0].block_size is (hex) %x\n",
                current->pid,
                (unsigned long)lli_array[0].bus_address,
                lli_array[0].block_size);

        /* Check the size of the last page */
        if (num_pages > 1) {
                lli_array[num_pages - 1].block_size =
                        (app_virt_addr + data_size) & (~PAGE_MASK);
                if (lli_array[num_pages - 1].block_size == 0)
                        lli_array[num_pages - 1].block_size = PAGE_SIZE;

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] After last page size adjustment\n"
                        "lli_array[%x].bus_address is (hex) %08lx, "
                        "lli_array[%x].block_size is (hex) %x\n",
                        current->pid, num_pages - 1,
                        (unsigned long)lli_array[num_pages - 1].bus_address,
                        num_pages - 1,
                        lli_array[num_pages - 1].block_size);
        }
        *lli_array_ptr = lli_array;
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_num_pages = num_pages;
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_page_array = NULL;
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_map_array = NULL;
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_map_num_entries = 0;

        return error;
}

/**
 * sep_calculate_lli_table_max_size - size the LLI table
 * @sep: pointer to struct sep_device
 * @lli_in_array_ptr
 * @num_array_entries
 * @last_table_flag
 *
 * This function calculates the size of data that can be inserted into
 * the lli table from this array, such that either the table is full
 * (all entries are entered), or there are no more entries in the
 * lli array
 */
static u32 sep_calculate_lli_table_max_size(struct sep_device *sep,
        struct sep_lli_entry *lli_in_array_ptr,
        u32 num_array_entries,
        u32 *last_table_flag)
{
        u32 counter;
        /* Table data size */
        u32 table_data_size = 0;
        /* Data size for the next table */
        u32 next_table_data_size;

        *last_table_flag = 0;

        /*
         * Calculate the data in the out lli table till we fill the whole
         * table or till the data has ended
         */
        for (counter = 0;
                (counter < (SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP - 1)) &&
                        (counter < num_array_entries); counter++)
                table_data_size += lli_in_array_ptr[counter].block_size;

        /*
         * Check if we reached the last entry,
         * meaning this ia the last table to build,
         * and no need to check the block alignment
         */
        if (counter == num_array_entries) {
                /* Set the last table flag */
                *last_table_flag = 1;
                goto end_function;
        }

        /*
         * Calculate the data size of the next table.
         * Stop if no entries left or if data size is more the DMA restriction
         */
        next_table_data_size = 0;
        for (; counter < num_array_entries; counter++) {
                next_table_data_size += lli_in_array_ptr[counter].block_size;
                if (next_table_data_size >= SEP_DRIVER_MIN_DATA_SIZE_PER_TABLE)
                        break;
        }

        /*
         * Check if the next table data size is less then DMA rstriction.
         * if it is - recalculate the current table size, so that the next
         * table data size will be adaquete for DMA
         */
        if (next_table_data_size &&
                next_table_data_size < SEP_DRIVER_MIN_DATA_SIZE_PER_TABLE)

                table_data_size -= (SEP_DRIVER_MIN_DATA_SIZE_PER_TABLE -
                        next_table_data_size);

end_function:
        return table_data_size;
}

/**
 * sep_build_lli_table - build an lli array for the given table
 * @sep: pointer to struct sep_device
 * @lli_array_ptr: pointer to lli array
 * @lli_table_ptr: pointer to lli table
 * @num_processed_entries_ptr: pointer to number of entries
 * @num_table_entries_ptr: pointer to number of tables
 * @table_data_size: total data size
 *
 * Builds an lli table from the lli_array according to
 * the given size of data
 */
static void sep_build_lli_table(struct sep_device *sep,
        struct sep_lli_entry    *lli_array_ptr,
        struct sep_lli_entry    *lli_table_ptr,
        u32 *num_processed_entries_ptr,
        u32 *num_table_entries_ptr,
        u32 table_data_size)
{
        /* Current table data size */
        u32 curr_table_data_size;
        /* Counter of lli array entry */
        u32 array_counter;

        /* Init current table data size and lli array entry counter */
        curr_table_data_size = 0;
        array_counter = 0;
        *num_table_entries_ptr = 1;

        dev_dbg(&sep->pdev->dev,
                "[PID%d] build lli table table_data_size: (hex) %x\n",
                        current->pid, table_data_size);

        /* Fill the table till table size reaches the needed amount */
        while (curr_table_data_size < table_data_size) {
                /* Update the number of entries in table */
                (*num_table_entries_ptr)++;

                lli_table_ptr->bus_address =
                        cpu_to_le32(lli_array_ptr[array_counter].bus_address);

                lli_table_ptr->block_size =
                        cpu_to_le32(lli_array_ptr[array_counter].block_size);

                curr_table_data_size += lli_array_ptr[array_counter].block_size;

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] lli_table_ptr is %p\n",
                                current->pid, lli_table_ptr);
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] lli_table_ptr->bus_address: %08lx\n",
                                current->pid,
                                (unsigned long)lli_table_ptr->bus_address);

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] lli_table_ptr->block_size is (hex) %x\n",
                                current->pid, lli_table_ptr->block_size);

                /* Check for overflow of the table data */
                if (curr_table_data_size > table_data_size) {
                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] curr_table_data_size too large\n",
                                        current->pid);

                        /* Update the size of block in the table */
                        lli_table_ptr->block_size =
                                cpu_to_le32(lli_table_ptr->block_size) -
                                (curr_table_data_size - table_data_size);

                        /* Update the physical address in the lli array */
                        lli_array_ptr[array_counter].bus_address +=
                        cpu_to_le32(lli_table_ptr->block_size);

                        /* Update the block size left in the lli array */
                        lli_array_ptr[array_counter].block_size =
                                (curr_table_data_size - table_data_size);
                } else
                        /* Advance to the next entry in the lli_array */
                        array_counter++;

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] lli_table_ptr->bus_address is %08lx\n",
                                current->pid,
                                (unsigned long)lli_table_ptr->bus_address);
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] lli_table_ptr->block_size is (hex) %x\n",
                                current->pid,
                                lli_table_ptr->block_size);

                /* Move to the next entry in table */
                lli_table_ptr++;
        }

        /* Set the info entry to default */
        lli_table_ptr->bus_address = 0xffffffff;
        lli_table_ptr->block_size = 0;

        /* Set the output parameter */
        *num_processed_entries_ptr += array_counter;

}

/**
 * sep_shared_area_virt_to_bus - map shared area to bus address
 * @sep: pointer to struct sep_device
 * @virt_address: virtual address to convert
 *
 * This functions returns the physical address inside shared area according
 * to the virtual address. It can be either on the external RAM device
 * (ioremapped), or on the system RAM
 * This implementation is for the external RAM
 */
static dma_addr_t sep_shared_area_virt_to_bus(struct sep_device *sep,
        void *virt_address)
{
        dev_dbg(&sep->pdev->dev, "[PID%d] sh virt to phys v %p\n",
                                        current->pid, virt_address);
        dev_dbg(&sep->pdev->dev, "[PID%d] sh virt to phys p %08lx\n",
                current->pid,
                (unsigned long)
                sep->shared_bus + (virt_address - sep->shared_addr));

        return sep->shared_bus + (size_t)(virt_address - sep->shared_addr);
}

/**
 * sep_shared_area_bus_to_virt - map shared area bus address to kernel
 * @sep: pointer to struct sep_device
 * @bus_address: bus address to convert
 *
 * This functions returns the virtual address inside shared area
 * according to the physical address. It can be either on the
 * external RAM device (ioremapped), or on the system RAM
 * This implementation is for the external RAM
 */
static void *sep_shared_area_bus_to_virt(struct sep_device *sep,
        dma_addr_t bus_address)
{
        dev_dbg(&sep->pdev->dev, "[PID%d] shared bus to virt b=%lx v=%lx\n",
                current->pid,
                (unsigned long)bus_address, (unsigned long)(sep->shared_addr +
                        (size_t)(bus_address - sep->shared_bus)));

        return sep->shared_addr + (size_t)(bus_address - sep->shared_bus);
}

/**
 * sep_debug_print_lli_tables - dump LLI table
 * @sep: pointer to struct sep_device
 * @lli_table_ptr: pointer to sep_lli_entry
 * @num_table_entries: number of entries
 * @table_data_size: total data size
 *
 * Walk the the list of the print created tables and print all the data
 */
static void sep_debug_print_lli_tables(struct sep_device *sep,
        struct sep_lli_entry *lli_table_ptr,
        unsigned long num_table_entries,
        unsigned long table_data_size)
{
#ifdef DEBUG
        unsigned long table_count = 1;
        unsigned long entries_count = 0;

        dev_dbg(&sep->pdev->dev, "[PID%d] sep_debug_print_lli_tables start\n",
                                        current->pid);
        if (num_table_entries == 0) {
                dev_dbg(&sep->pdev->dev, "[PID%d] no table to print\n",
                        current->pid);
                return;
        }

        while ((unsigned long) lli_table_ptr->bus_address != 0xffffffff) {
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] lli table %08lx, "
                        "table_data_size is (hex) %lx\n",
                                current->pid, table_count, table_data_size);
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] num_table_entries is (hex) %lx\n",
                                current->pid, num_table_entries);

                /* Print entries of the table (without info entry) */
                for (entries_count = 0; entries_count < num_table_entries;
                        entries_count++, lli_table_ptr++) {

                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] lli_table_ptr address is %08lx\n",
                                current->pid,
                                (unsigned long) lli_table_ptr);

                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] phys address is %08lx "
                                "block size is (hex) %x\n", current->pid,
                                (unsigned long)lli_table_ptr->bus_address,
                                lli_table_ptr->block_size);
                }

                /* Point to the info entry */
                lli_table_ptr--;

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] phys lli_table_ptr->block_size "
                        "is (hex) %x\n",
                        current->pid,
                        lli_table_ptr->block_size);

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] phys lli_table_ptr->physical_address "
                        "is %08lx\n",
                        current->pid,
                        (unsigned long)lli_table_ptr->bus_address);


                table_data_size = lli_table_ptr->block_size & 0xffffff;
                num_table_entries = (lli_table_ptr->block_size >> 24) & 0xff;

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] phys table_data_size is "
                        "(hex) %lx num_table_entries is"
                        " %lx bus_address is%lx\n",
                                current->pid,
                                table_data_size,
                                num_table_entries,
                                (unsigned long)lli_table_ptr->bus_address);

                if ((unsigned long)lli_table_ptr->bus_address != 0xffffffff)
                        lli_table_ptr = (struct sep_lli_entry *)
                                sep_shared_bus_to_virt(sep,
                                (unsigned long)lli_table_ptr->bus_address);

                table_count++;
        }
        dev_dbg(&sep->pdev->dev, "[PID%d] sep_debug_print_lli_tables end\n",
                                        current->pid);
#endif
}


/**
 * sep_prepare_empty_lli_table - create a blank LLI table
 * @sep: pointer to struct sep_device
 * @lli_table_addr_ptr: pointer to lli table
 * @num_entries_ptr: pointer to number of entries
 * @table_data_size_ptr: point to table data size
 * @dmatables_region: Optional buffer for DMA tables
 * @dma_ctx: DMA context
 *
 * This function creates empty lli tables when there is no data
 */
static void sep_prepare_empty_lli_table(struct sep_device *sep,
                dma_addr_t *lli_table_addr_ptr,
                u32 *num_entries_ptr,
                u32 *table_data_size_ptr,
                void **dmatables_region,
                struct sep_dma_context *dma_ctx)
{
        struct sep_lli_entry *lli_table_ptr;

        /* Find the area for new table */
        lli_table_ptr =
                (struct sep_lli_entry *)(sep->shared_addr +
                SYNCHRONIC_DMA_TABLES_AREA_OFFSET_BYTES +
                dma_ctx->num_lli_tables_created * sizeof(struct sep_lli_entry) *
                        SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP);

        if (dmatables_region && *dmatables_region)
                lli_table_ptr = *dmatables_region;

        lli_table_ptr->bus_address = 0;
        lli_table_ptr->block_size = 0;

        lli_table_ptr++;
        lli_table_ptr->bus_address = 0xFFFFFFFF;
        lli_table_ptr->block_size = 0;

        /* Set the output parameter value */
        *lli_table_addr_ptr = sep->shared_bus +
                SYNCHRONIC_DMA_TABLES_AREA_OFFSET_BYTES +
                dma_ctx->num_lli_tables_created *
                sizeof(struct sep_lli_entry) *
                SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP;

        /* Set the num of entries and table data size for empty table */
        *num_entries_ptr = 2;
        *table_data_size_ptr = 0;

        /* Update the number of created tables */
        dma_ctx->num_lli_tables_created++;
}

/**
 * sep_prepare_input_dma_table - prepare input DMA mappings
 * @sep: pointer to struct sep_device
 * @data_size:
 * @block_size:
 * @lli_table_ptr:
 * @num_entries_ptr:
 * @table_data_size_ptr:
 * @is_kva: set for kernel data (kernel crypt io call)
 *
 * This function prepares only input DMA table for synchronic symmetric
 * operations (HASH)
 * Note that all bus addresses that are passed to the SEP
 * are in 32 bit format; the SEP is a 32 bit device
 */
static int sep_prepare_input_dma_table(struct sep_device *sep,
        unsigned long app_virt_addr,
        u32 data_size,
        u32 block_size,
        dma_addr_t *lli_table_ptr,
        u32 *num_entries_ptr,
        u32 *table_data_size_ptr,
        bool is_kva,
        void **dmatables_region,
        struct sep_dma_context *dma_ctx
)
{
        int error = 0;
        /* Pointer to the info entry of the table - the last entry */
        struct sep_lli_entry *info_entry_ptr;
        /* Array of pointers to page */
        struct sep_lli_entry *lli_array_ptr;
        /* Points to the first entry to be processed in the lli_in_array */
        u32 current_entry = 0;
        /* Num entries in the virtual buffer */
        u32 sep_lli_entries = 0;
        /* Lli table pointer */
        struct sep_lli_entry *in_lli_table_ptr;
        /* The total data in one table */
        u32 table_data_size = 0;
        /* Flag for last table */
        u32 last_table_flag = 0;
        /* Number of entries in lli table */
        u32 num_entries_in_table = 0;
        /* Next table address */
        void *lli_table_alloc_addr = NULL;
        void *dma_lli_table_alloc_addr = NULL;
        void *dma_in_lli_table_ptr = NULL;

        dev_dbg(&sep->pdev->dev,
                "[PID%d] prepare intput dma tbl data size: (hex) %x\n",
                current->pid, data_size);

        dev_dbg(&sep->pdev->dev, "[PID%d] block_size is (hex) %x\n",
                                        current->pid, block_size);

        /* Initialize the pages pointers */
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_page_array = NULL;
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_num_pages = 0;

        /* Set the kernel address for first table to be allocated */
        lli_table_alloc_addr = (void *)(sep->shared_addr +
                SYNCHRONIC_DMA_TABLES_AREA_OFFSET_BYTES +
                dma_ctx->num_lli_tables_created * sizeof(struct sep_lli_entry) *
                SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP);

        if (data_size == 0) {
                if (dmatables_region) {
                        error = sep_allocate_dmatables_region(sep,
                                                dmatables_region,
                                                dma_ctx,
                                                1);
                        if (error)
                                return error;
                }
                /* Special case  - create meptu table - 2 entries, zero data */
                sep_prepare_empty_lli_table(sep, lli_table_ptr,
                                num_entries_ptr, table_data_size_ptr,
                                dmatables_region, dma_ctx);
                goto update_dcb_counter;
        }

        /* Check if the pages are in Kernel Virtual Address layout */
        if (is_kva == true)
                error = sep_lock_kernel_pages(sep, app_virt_addr,
                        data_size, &lli_array_ptr, SEP_DRIVER_IN_FLAG,
                        dma_ctx);
        else
                /*
                 * Lock the pages of the user buffer
                 * and translate them to pages
                 */
                error = sep_lock_user_pages(sep, app_virt_addr,
                        data_size, &lli_array_ptr, SEP_DRIVER_IN_FLAG,
                        dma_ctx);

        if (error)
                goto end_function;

        dev_dbg(&sep->pdev->dev,
                "[PID%d] output sep_in_num_pages is (hex) %x\n",
                current->pid,
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_num_pages);

        current_entry = 0;
        info_entry_ptr = NULL;

        sep_lli_entries =
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_num_pages;

        dma_lli_table_alloc_addr = lli_table_alloc_addr;
        if (dmatables_region) {
                error = sep_allocate_dmatables_region(sep,
                                        dmatables_region,
                                        dma_ctx,
                                        sep_lli_entries);
                if (error)
                        return error;
                lli_table_alloc_addr = *dmatables_region;
        }

        /* Loop till all the entries in in array are processed */
        while (current_entry < sep_lli_entries) {

                /* Set the new input and output tables */
                in_lli_table_ptr =
                        (struct sep_lli_entry *)lli_table_alloc_addr;
                dma_in_lli_table_ptr =
                        (struct sep_lli_entry *)dma_lli_table_alloc_addr;

                lli_table_alloc_addr += sizeof(struct sep_lli_entry) *
                        SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP;
                dma_lli_table_alloc_addr += sizeof(struct sep_lli_entry) *
                        SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP;

                if (dma_lli_table_alloc_addr >
                        ((void *)sep->shared_addr +
                        SYNCHRONIC_DMA_TABLES_AREA_OFFSET_BYTES +
                        SYNCHRONIC_DMA_TABLES_AREA_SIZE_BYTES)) {

                        error = -ENOMEM;
                        goto end_function_error;

                }

                /* Update the number of created tables */
                dma_ctx->num_lli_tables_created++;

                /* Calculate the maximum size of data for input table */
                table_data_size = sep_calculate_lli_table_max_size(sep,
                        &lli_array_ptr[current_entry],
                        (sep_lli_entries - current_entry),
                        &last_table_flag);

                /*
                 * If this is not the last table -
                 * then align it to the block size
                 */
                if (!last_table_flag)
                        table_data_size =
                                (table_data_size / block_size) * block_size;

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] output table_data_size is (hex) %x\n",
                                current->pid,
                                table_data_size);

                /* Construct input lli table */
                sep_build_lli_table(sep, &lli_array_ptr[current_entry],
                        in_lli_table_ptr,
                        &current_entry, &num_entries_in_table, table_data_size);

                if (info_entry_ptr == NULL) {

                        /* Set the output parameters to physical addresses */
                        *lli_table_ptr = sep_shared_area_virt_to_bus(sep,
                                dma_in_lli_table_ptr);
                        *num_entries_ptr = num_entries_in_table;
                        *table_data_size_ptr = table_data_size;

                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] output lli_table_in_ptr is %08lx\n",
                                current->pid,
                                (unsigned long)*lli_table_ptr);

                } else {
                        /* Update the info entry of the previous in table */
                        info_entry_ptr->bus_address =
                                sep_shared_area_virt_to_bus(sep,
                                                        dma_in_lli_table_ptr);
                        info_entry_ptr->block_size =
                                ((num_entries_in_table) << 24) |
                                (table_data_size);
                }
                /* Save the pointer to the info entry of the current tables */
                info_entry_ptr = in_lli_table_ptr + num_entries_in_table - 1;
        }
        /* Print input tables */
        if (!dmatables_region) {
                sep_debug_print_lli_tables(sep, (struct sep_lli_entry *)
                        sep_shared_area_bus_to_virt(sep, *lli_table_ptr),
                        *num_entries_ptr, *table_data_size_ptr);
        }

        /* The array of the pages */
        kfree(lli_array_ptr);

update_dcb_counter:
        /* Update DCB counter */
        dma_ctx->nr_dcb_creat++;
        goto end_function;

end_function_error:
        /* Free all the allocated resources */
        kfree(dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_map_array);
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_map_array = NULL;
        kfree(lli_array_ptr);
        kfree(dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_page_array);
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_page_array = NULL;

end_function:
        return error;

}

/**
 * sep_construct_dma_tables_from_lli - prepare AES/DES mappings
 * @sep: pointer to struct sep_device
 * @lli_in_array:
 * @sep_in_lli_entries:
 * @lli_out_array:
 * @sep_out_lli_entries
 * @block_size
 * @lli_table_in_ptr
 * @lli_table_out_ptr
 * @in_num_entries_ptr
 * @out_num_entries_ptr
 * @table_data_size_ptr
 *
 * This function creates the input and output DMA tables for
 * symmetric operations (AES/DES) according to the block
 * size from LLI arays
 * Note that all bus addresses that are passed to the SEP
 * are in 32 bit format; the SEP is a 32 bit device
 */
static int sep_construct_dma_tables_from_lli(
        struct sep_device *sep,
        struct sep_lli_entry *lli_in_array,
        u32     sep_in_lli_entries,
        struct sep_lli_entry *lli_out_array,
        u32     sep_out_lli_entries,
        u32     block_size,
        dma_addr_t *lli_table_in_ptr,
        dma_addr_t *lli_table_out_ptr,
        u32     *in_num_entries_ptr,
        u32     *out_num_entries_ptr,
        u32     *table_data_size_ptr,
        void    **dmatables_region,
        struct sep_dma_context *dma_ctx)
{
        /* Points to the area where next lli table can be allocated */
        void *lli_table_alloc_addr = NULL;
        /*
         * Points to the area in shared region where next lli table
         * can be allocated
         */
        void *dma_lli_table_alloc_addr = NULL;
        /* Input lli table in dmatables_region or shared region */
        struct sep_lli_entry *in_lli_table_ptr = NULL;
        /* Input lli table location in the shared region */
        struct sep_lli_entry *dma_in_lli_table_ptr = NULL;
        /* Output lli table in dmatables_region or shared region */
        struct sep_lli_entry *out_lli_table_ptr = NULL;
        /* Output lli table location in the shared region */
        struct sep_lli_entry *dma_out_lli_table_ptr = NULL;
        /* Pointer to the info entry of the table - the last entry */
        struct sep_lli_entry *info_in_entry_ptr = NULL;
        /* Pointer to the info entry of the table - the last entry */
        struct sep_lli_entry *info_out_entry_ptr = NULL;
        /* Points to the first entry to be processed in the lli_in_array */
        u32 current_in_entry = 0;
        /* Points to the first entry to be processed in the lli_out_array */
        u32 current_out_entry = 0;
        /* Max size of the input table */
        u32 in_table_data_size = 0;
        /* Max size of the output table */
        u32 out_table_data_size = 0;
        /* Flag te signifies if this is the last tables build */
        u32 last_table_flag = 0;
        /* The data size that should be in table */
        u32 table_data_size = 0;
        /* Number of entries in the input table */
        u32 num_entries_in_table = 0;
        /* Number of entries in the output table */
        u32 num_entries_out_table = 0;

        if (!dma_ctx) {
                dev_warn(&sep->pdev->dev, "DMA context uninitialized\n");
                return -EINVAL;
        }

        /* Initiate to point after the message area */
        lli_table_alloc_addr = (void *)(sep->shared_addr +
                SYNCHRONIC_DMA_TABLES_AREA_OFFSET_BYTES +
                (dma_ctx->num_lli_tables_created *
                (sizeof(struct sep_lli_entry) *
                SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP)));
        dma_lli_table_alloc_addr = lli_table_alloc_addr;

        if (dmatables_region) {
                /* 2 for both in+out table */
                if (sep_allocate_dmatables_region(sep,
                                        dmatables_region,
                                        dma_ctx,
                                        2*sep_in_lli_entries))
                        return -ENOMEM;
                lli_table_alloc_addr = *dmatables_region;
        }

        /* Loop till all the entries in in array are not processed */
        while (current_in_entry < sep_in_lli_entries) {
                /* Set the new input and output tables */
                in_lli_table_ptr =
                        (struct sep_lli_entry *)lli_table_alloc_addr;
                dma_in_lli_table_ptr =
                        (struct sep_lli_entry *)dma_lli_table_alloc_addr;

                lli_table_alloc_addr += sizeof(struct sep_lli_entry) *
                        SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP;
                dma_lli_table_alloc_addr += sizeof(struct sep_lli_entry) *
                        SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP;

                /* Set the first output tables */
                out_lli_table_ptr =
                        (struct sep_lli_entry *)lli_table_alloc_addr;
                dma_out_lli_table_ptr =
                        (struct sep_lli_entry *)dma_lli_table_alloc_addr;

                /* Check if the DMA table area limit was overrun */
                if ((dma_lli_table_alloc_addr + sizeof(struct sep_lli_entry) *
                        SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP) >
                        ((void *)sep->shared_addr +
                        SYNCHRONIC_DMA_TABLES_AREA_OFFSET_BYTES +
                        SYNCHRONIC_DMA_TABLES_AREA_SIZE_BYTES)) {

                        dev_warn(&sep->pdev->dev, "dma table limit overrun\n");
                        return -ENOMEM;
                }

                /* Update the number of the lli tables created */
                dma_ctx->num_lli_tables_created += 2;

                lli_table_alloc_addr += sizeof(struct sep_lli_entry) *
                        SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP;
                dma_lli_table_alloc_addr += sizeof(struct sep_lli_entry) *
                        SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP;

                /* Calculate the maximum size of data for input table */
                in_table_data_size =
                        sep_calculate_lli_table_max_size(sep,
                        &lli_in_array[current_in_entry],
                        (sep_in_lli_entries - current_in_entry),
                        &last_table_flag);

                /* Calculate the maximum size of data for output table */
                out_table_data_size =
                        sep_calculate_lli_table_max_size(sep,
                        &lli_out_array[current_out_entry],
                        (sep_out_lli_entries - current_out_entry),
                        &last_table_flag);

                if (!last_table_flag) {
                        in_table_data_size = (in_table_data_size /
                                block_size) * block_size;
                        out_table_data_size = (out_table_data_size /
                                block_size) * block_size;
                }

                table_data_size = in_table_data_size;
                if (table_data_size > out_table_data_size)
                        table_data_size = out_table_data_size;

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] construct tables from lli"
                        " in_table_data_size is (hex) %x\n", current->pid,
                        in_table_data_size);

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] construct tables from lli"
                        "out_table_data_size is (hex) %x\n", current->pid,
                        out_table_data_size);

                /* Construct input lli table */
                sep_build_lli_table(sep, &lli_in_array[current_in_entry],
                        in_lli_table_ptr,
                        &current_in_entry,
                        &num_entries_in_table,
                        table_data_size);

                /* Construct output lli table */
                sep_build_lli_table(sep, &lli_out_array[current_out_entry],
                        out_lli_table_ptr,
                        &current_out_entry,
                        &num_entries_out_table,
                        table_data_size);

                /* If info entry is null - this is the first table built */
                if (info_in_entry_ptr == NULL) {
                        /* Set the output parameters to physical addresses */
                        *lli_table_in_ptr =
                        sep_shared_area_virt_to_bus(sep, dma_in_lli_table_ptr);

                        *in_num_entries_ptr = num_entries_in_table;

                        *lli_table_out_ptr =
                                sep_shared_area_virt_to_bus(sep,
                                dma_out_lli_table_ptr);

                        *out_num_entries_ptr = num_entries_out_table;
                        *table_data_size_ptr = table_data_size;

                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] output lli_table_in_ptr is %08lx\n",
                                current->pid,
                                (unsigned long)*lli_table_in_ptr);
                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] output lli_table_out_ptr is %08lx\n",
                                current->pid,
                                (unsigned long)*lli_table_out_ptr);
                } else {
                        /* Update the info entry of the previous in table */
                        info_in_entry_ptr->bus_address =
                                sep_shared_area_virt_to_bus(sep,
                                dma_in_lli_table_ptr);

                        info_in_entry_ptr->block_size =
                                ((num_entries_in_table) << 24) |
                                (table_data_size);

                        /* Update the info entry of the previous in table */
                        info_out_entry_ptr->bus_address =
                                sep_shared_area_virt_to_bus(sep,
                                dma_out_lli_table_ptr);

                        info_out_entry_ptr->block_size =
                                ((num_entries_out_table) << 24) |
                                (table_data_size);

                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] output lli_table_in_ptr:%08lx %08x\n",
                                current->pid,
                                (unsigned long)info_in_entry_ptr->bus_address,
                                info_in_entry_ptr->block_size);

                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] output lli_table_out_ptr:"
                                "%08lx  %08x\n",
                                current->pid,
                                (unsigned long)info_out_entry_ptr->bus_address,
                                info_out_entry_ptr->block_size);
                }

                /* Save the pointer to the info entry of the current tables */
                info_in_entry_ptr = in_lli_table_ptr +
                        num_entries_in_table - 1;
                info_out_entry_ptr = out_lli_table_ptr +
                        num_entries_out_table - 1;

                dev_dbg(&sep->pdev->dev,
                        "[PID%d] output num_entries_out_table is %x\n",
                        current->pid,
                        (u32)num_entries_out_table);
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] output info_in_entry_ptr is %lx\n",
                        current->pid,
                        (unsigned long)info_in_entry_ptr);
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] output info_out_entry_ptr is %lx\n",
                        current->pid,
                        (unsigned long)info_out_entry_ptr);
        }

        /* Print input tables */
        if (!dmatables_region) {
                sep_debug_print_lli_tables(
                        sep,
                        (struct sep_lli_entry *)
                        sep_shared_area_bus_to_virt(sep, *lli_table_in_ptr),
                        *in_num_entries_ptr,
                        *table_data_size_ptr);
        }

        /* Print output tables */
        if (!dmatables_region) {
                sep_debug_print_lli_tables(
                        sep,
                        (struct sep_lli_entry *)
                        sep_shared_area_bus_to_virt(sep, *lli_table_out_ptr),
                        *out_num_entries_ptr,
                        *table_data_size_ptr);
        }

        return 0;
}

/**
 * sep_prepare_input_output_dma_table - prepare DMA I/O table
 * @app_virt_in_addr:
 * @app_virt_out_addr:
 * @data_size:
 * @block_size:
 * @lli_table_in_ptr:
 * @lli_table_out_ptr:
 * @in_num_entries_ptr:
 * @out_num_entries_ptr:
 * @table_data_size_ptr:
 * @is_kva: set for kernel data; used only for kernel crypto module
 *
 * This function builds input and output DMA tables for synchronic
 * symmetric operations (AES, DES, HASH). It also checks that each table
 * is of the modular block size
 * Note that all bus addresses that are passed to the SEP
 * are in 32 bit format; the SEP is a 32 bit device
 */
static int sep_prepare_input_output_dma_table(struct sep_device *sep,
        unsigned long app_virt_in_addr,
        unsigned long app_virt_out_addr,
        u32 data_size,
        u32 block_size,
        dma_addr_t *lli_table_in_ptr,
        dma_addr_t *lli_table_out_ptr,
        u32 *in_num_entries_ptr,
        u32 *out_num_entries_ptr,
        u32 *table_data_size_ptr,
        bool is_kva,
        void **dmatables_region,
        struct sep_dma_context *dma_ctx)

{
        int error = 0;
        /* Array of pointers of page */
        struct sep_lli_entry *lli_in_array;
        /* Array of pointers of page */
        struct sep_lli_entry *lli_out_array;

        if (!dma_ctx) {
                error = -EINVAL;
                goto end_function;
        }

        if (data_size == 0) {
                /* Prepare empty table for input and output */
                if (dmatables_region) {
                        error = sep_allocate_dmatables_region(
                                        sep,
                                        dmatables_region,
                                        dma_ctx,
                                        2);
                  if (error)
                        goto end_function;
                }
                sep_prepare_empty_lli_table(sep, lli_table_in_ptr,
                        in_num_entries_ptr, table_data_size_ptr,
                        dmatables_region, dma_ctx);

                sep_prepare_empty_lli_table(sep, lli_table_out_ptr,
                        out_num_entries_ptr, table_data_size_ptr,
                        dmatables_region, dma_ctx);

                goto update_dcb_counter;
        }

        /* Initialize the pages pointers */
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_page_array = NULL;
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_page_array = NULL;

        /* Lock the pages of the buffer and translate them to pages */
        if (is_kva == true) {
                dev_dbg(&sep->pdev->dev, "[PID%d] Locking kernel input pages\n",
                                                current->pid);
                error = sep_lock_kernel_pages(sep, app_virt_in_addr,
                                data_size, &lli_in_array, SEP_DRIVER_IN_FLAG,
                                dma_ctx);
                if (error) {
                        dev_warn(&sep->pdev->dev,
                                "[PID%d] sep_lock_kernel_pages for input "
                                "virtual buffer failed\n", current->pid);

                        goto end_function;
                }

                dev_dbg(&sep->pdev->dev, "[PID%d] Locking kernel output pages\n",
                                                current->pid);
                error = sep_lock_kernel_pages(sep, app_virt_out_addr,
                                data_size, &lli_out_array, SEP_DRIVER_OUT_FLAG,
                                dma_ctx);

                if (error) {
                        dev_warn(&sep->pdev->dev,
                                "[PID%d] sep_lock_kernel_pages for output "
                                "virtual buffer failed\n", current->pid);

                        goto end_function_free_lli_in;
                }

        }

        else {
                dev_dbg(&sep->pdev->dev, "[PID%d] Locking user input pages\n",
                                                current->pid);
                error = sep_lock_user_pages(sep, app_virt_in_addr,
                                data_size, &lli_in_array, SEP_DRIVER_IN_FLAG,
                                dma_ctx);
                if (error) {
                        dev_warn(&sep->pdev->dev,
                                "[PID%d] sep_lock_user_pages for input "
                                "virtual buffer failed\n", current->pid);

                        goto end_function;
                }

                if (dma_ctx->secure_dma == true) {
                        /* secure_dma requires use of non accessible memory */
                        dev_dbg(&sep->pdev->dev, "[PID%d] in secure_dma\n",
                                current->pid);
                        error = sep_lli_table_secure_dma(sep,
                                app_virt_out_addr, data_size, &lli_out_array,
                                SEP_DRIVER_OUT_FLAG, dma_ctx);
                        if (error) {
                                dev_warn(&sep->pdev->dev,
                                        "[PID%d] secure dma table setup "
                                        " for output virtual buffer failed\n",
                                        current->pid);

                                goto end_function_free_lli_in;
                        }
                } else {
                        /* For normal, non-secure dma */
                        dev_dbg(&sep->pdev->dev, "[PID%d] not in secure_dma\n",
                                current->pid);

                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] Locking user output pages\n",
                                current->pid);

                        error = sep_lock_user_pages(sep, app_virt_out_addr,
                                data_size, &lli_out_array, SEP_DRIVER_OUT_FLAG,
                                dma_ctx);

                        if (error) {
                                dev_warn(&sep->pdev->dev,
                                        "[PID%d] sep_lock_user_pages"
                                        " for output virtual buffer failed\n",
                                        current->pid);

                                goto end_function_free_lli_in;
                        }
                }
        }

        dev_dbg(&sep->pdev->dev,
                "[PID%d] After lock; prep input output dma table sep_in_num_pages is (hex) %x\n",
                current->pid,
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_num_pages);

        dev_dbg(&sep->pdev->dev, "[PID%d] sep_out_num_pages is (hex) %x\n",
                current->pid,
                dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_num_pages);

        dev_dbg(&sep->pdev->dev,
                "[PID%d] SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP is (hex) %x\n",
                current->pid, SEP_DRIVER_ENTRIES_PER_TABLE_IN_SEP);

        /* Call the function that creates table from the lli arrays */
        dev_dbg(&sep->pdev->dev, "[PID%d] calling create table from lli\n",
                                        current->pid);
        error = sep_construct_dma_tables_from_lli(
                        sep, lli_in_array,
                        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].
                                                                in_num_pages,
                        lli_out_array,
                        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].
                                                                out_num_pages,
                        block_size, lli_table_in_ptr, lli_table_out_ptr,
                        in_num_entries_ptr, out_num_entries_ptr,
                        table_data_size_ptr, dmatables_region, dma_ctx);

        if (error) {
                dev_warn(&sep->pdev->dev,
                        "[PID%d] sep_construct_dma_tables_from_lli failed\n",
                        current->pid);
                goto end_function_with_error;
        }

        kfree(lli_out_array);
        kfree(lli_in_array);

update_dcb_counter:
        /* Update DCB counter */
        dma_ctx->nr_dcb_creat++;

        goto end_function;

end_function_with_error:
        kfree(dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_map_array);
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_map_array = NULL;
        kfree(dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_page_array);
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].out_page_array = NULL;
        kfree(lli_out_array);


end_function_free_lli_in:
        kfree(dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_map_array);
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_map_array = NULL;
        kfree(dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_page_array);
        dma_ctx->dma_res_arr[dma_ctx->nr_dcb_creat].in_page_array = NULL;
        kfree(lli_in_array);

end_function:

        return error;

}

/**
 * sep_prepare_input_output_dma_table_in_dcb - prepare control blocks
 * @app_in_address: unsigned long; for data buffer in (user space)
 * @app_out_address: unsigned long; for data buffer out (user space)
 * @data_in_size: u32; for size of data
 * @block_size: u32; for block size
 * @tail_block_size: u32; for size of tail block
 * @isapplet: bool; to indicate external app
 * @is_kva: bool; kernel buffer; only used for kernel crypto module
 * @secure_dma; indicates whether this is secure_dma using IMR
 *
 * This function prepares the linked DMA tables and puts the
 * address for the linked list of tables inta a DCB (data control
 * block) the address of which is known by the SEP hardware
 * Note that all bus addresses that are passed to the SEP
 * are in 32 bit format; the SEP is a 32 bit device
 */
int sep_prepare_input_output_dma_table_in_dcb(struct sep_device *sep,
        unsigned long  app_in_address,
        unsigned long  app_out_address,
        u32  data_in_size,
        u32  block_size,
        u32  tail_block_size,
        bool isapplet,
        bool    is_kva,
        bool    secure_dma,
        struct sep_dcblock *dcb_region,
        void **dmatables_region,
        struct sep_dma_context **dma_ctx,
        struct scatterlist *src_sg,
        struct scatterlist *dst_sg)
{
        int error = 0;
        /* Size of tail */
        u32 tail_size = 0;
        /* Address of the created DCB table */
        struct sep_dcblock *dcb_table_ptr = NULL;
        /* The physical address of the first input DMA table */
        dma_addr_t in_first_mlli_address = 0;
        /* Number of entries in the first input DMA table */
        u32  in_first_num_entries = 0;
        /* The physical address of the first output DMA table */
        dma_addr_t  out_first_mlli_address = 0;
        /* Number of entries in the first output DMA table */
        u32  out_first_num_entries = 0;
        /* Data in the first input/output table */
        u32  first_data_size = 0;

        dev_dbg(&sep->pdev->dev, "[PID%d] app_in_address %lx\n",
                current->pid, app_in_address);

        dev_dbg(&sep->pdev->dev, "[PID%d] app_out_address %lx\n",
                current->pid, app_out_address);

        dev_dbg(&sep->pdev->dev, "[PID%d] data_in_size %x\n",
                current->pid, data_in_size);

        dev_dbg(&sep->pdev->dev, "[PID%d] block_size %x\n",
                current->pid, block_size);

        dev_dbg(&sep->pdev->dev, "[PID%d] tail_block_size %x\n",
                current->pid, tail_block_size);

        dev_dbg(&sep->pdev->dev, "[PID%d] isapplet %x\n",
                current->pid, isapplet);

        dev_dbg(&sep->pdev->dev, "[PID%d] is_kva %x\n",
                current->pid, is_kva);

        dev_dbg(&sep->pdev->dev, "[PID%d] src_sg %p\n",
                current->pid, src_sg);

        dev_dbg(&sep->pdev->dev, "[PID%d] dst_sg %p\n",
                current->pid, dst_sg);

        if (!dma_ctx) {
                dev_warn(&sep->pdev->dev, "[PID%d] no DMA context pointer\n",
                                                current->pid);
                error = -EINVAL;
                goto end_function;
        }

        if (*dma_ctx) {
                /* In case there are multiple DCBs for this transaction */
                dev_dbg(&sep->pdev->dev, "[PID%d] DMA context already set\n",
                                                current->pid);
        } else {
                *dma_ctx = kzalloc(sizeof(**dma_ctx), GFP_KERNEL);
                if (!(*dma_ctx)) {
                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] Not enough memory for DMA context\n",
                                current->pid);
                  error = -ENOMEM;
                  goto end_function;
                }
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] Created DMA context addr at 0x%p\n",
                        current->pid, *dma_ctx);
        }

        (*dma_ctx)->secure_dma = secure_dma;

        /* these are for kernel crypto only */
        (*dma_ctx)->src_sg = src_sg;
        (*dma_ctx)->dst_sg = dst_sg;

        if ((*dma_ctx)->nr_dcb_creat == SEP_MAX_NUM_SYNC_DMA_OPS) {
                /* No more DCBs to allocate */
                dev_dbg(&sep->pdev->dev, "[PID%d] no more DCBs available\n",
                                                current->pid);
                error = -ENOSPC;
                goto end_function_error;
        }

        /* Allocate new DCB */
        if (dcb_region) {
                dcb_table_ptr = dcb_region;
        } else {
                dcb_table_ptr = (struct sep_dcblock *)(sep->shared_addr +
                        SEP_DRIVER_SYSTEM_DCB_MEMORY_OFFSET_IN_BYTES +
                        ((*dma_ctx)->nr_dcb_creat *
                                                sizeof(struct sep_dcblock)));
        }

        /* Set the default values in the DCB */
        dcb_table_ptr->input_mlli_address = 0;
        dcb_table_ptr->input_mlli_num_entries = 0;
        dcb_table_ptr->input_mlli_data_size = 0;
        dcb_table_ptr->output_mlli_address = 0;
        dcb_table_ptr->output_mlli_num_entries = 0;
        dcb_table_ptr->output_mlli_data_size = 0;
        dcb_table_ptr->tail_data_size = 0;
        dcb_table_ptr->out_vr_tail_pt = 0;

        if (isapplet == true) {

                /* Check if there is enough data for DMA operation */
                if (data_in_size < SEP_DRIVER_MIN_DATA_SIZE_PER_TABLE) {
                        if (is_kva == true) {
                                error = -ENODEV;
                                goto end_function_error;
                        } else {
                                if (copy_from_user(dcb_table_ptr->tail_data,
                                        (void __user *)app_in_address,
                                        data_in_size)) {
                                        error = -EFAULT;
                                        goto end_function_error;
                                }
                        }

                        dcb_table_ptr->tail_data_size = data_in_size;

                        /* Set the output user-space address for mem2mem op */
                        if (app_out_address)
                                dcb_table_ptr->out_vr_tail_pt =
                                (aligned_u64)app_out_address;

                        /*
                         * Update both data length parameters in order to avoid
                         * second data copy and allow building of empty mlli
                         * tables
                         */
                        tail_size = 0x0;
                        data_in_size = 0x0;

                } else {
                        if (!app_out_address) {
                                tail_size = data_in_size % block_size;
                                if (!tail_size) {
                                        if (tail_block_size == block_size)
                                                tail_size = block_size;
                                }
                        } else {
                                tail_size = 0;
                        }
                }
                if (tail_size) {
                        if (tail_size > sizeof(dcb_table_ptr->tail_data))
                                return -EINVAL;
                        if (is_kva == true) {
                                error = -ENODEV;
                                goto end_function_error;
                        } else {
                                /* We have tail data - copy it to DCB */
                                if (copy_from_user(dcb_table_ptr->tail_data,
                                        (void __user *)(app_in_address +
                                        data_in_size - tail_size), tail_size)) {
                                        error = -EFAULT;
                                        goto end_function_error;
                                }
                        }
                        if (app_out_address)
                                /*
                                 * Calculate the output address
                                 * according to tail data size
                                 */
                                dcb_table_ptr->out_vr_tail_pt =
                                        (aligned_u64)app_out_address +
                                        data_in_size - tail_size;

                        /* Save the real tail data size */
                        dcb_table_ptr->tail_data_size = tail_size;
                        /*
                         * Update the data size without the tail
                         * data size AKA data for the dma
                         */
                        data_in_size = (data_in_size - tail_size);
                }
        }
        /* Check if we need to build only input table or input/output */
        if (app_out_address) {
                /* Prepare input/output tables */
                error = sep_prepare_input_output_dma_table(sep,
                                app_in_address,
                                app_out_address,
                                data_in_size,
                                block_size,
                                &in_first_mlli_address,
                                &out_first_mlli_address,
                                &in_first_num_entries,
                                &out_first_num_entries,
                                &first_data_size,
                                is_kva,
                                dmatables_region,
                                *dma_ctx);
        } else {
                /* Prepare input tables */
                error = sep_prepare_input_dma_table(sep,
                                app_in_address,
                                data_in_size,
                                block_size,
                                &in_first_mlli_address,
                                &in_first_num_entries,
                                &first_data_size,
                                is_kva,
                                dmatables_region,
                                *dma_ctx);
        }

        if (error) {
                dev_warn(&sep->pdev->dev,
                        "prepare DMA table call failed "
                        "from prepare DCB call\n");
                goto end_function_error;
        }

        /* Set the DCB values */
        dcb_table_ptr->input_mlli_address = in_first_mlli_address;
        dcb_table_ptr->input_mlli_num_entries = in_first_num_entries;
        dcb_table_ptr->input_mlli_data_size = first_data_size;
        dcb_table_ptr->output_mlli_address = out_first_mlli_address;
        dcb_table_ptr->output_mlli_num_entries = out_first_num_entries;
        dcb_table_ptr->output_mlli_data_size = first_data_size;

        goto end_function;

end_function_error:
        kfree(*dma_ctx);
        *dma_ctx = NULL;

end_function:
        return error;

}


/**
 * sep_free_dma_tables_and_dcb - free DMA tables and DCBs
 * @sep: pointer to struct sep_device
 * @isapplet: indicates external application (used for kernel access)
 * @is_kva: indicates kernel addresses (only used for kernel crypto)
 *
 * This function frees the DMA tables and DCB
 */
static int sep_free_dma_tables_and_dcb(struct sep_device *sep, bool isapplet,
        bool is_kva, struct sep_dma_context **dma_ctx)
{
        struct sep_dcblock *dcb_table_ptr;
        unsigned long pt_hold;
        void *tail_pt;

        int i = 0;
        int error = 0;
        int error_temp = 0;

        dev_dbg(&sep->pdev->dev, "[PID%d] sep_free_dma_tables_and_dcb\n",
                                        current->pid);

        if (((*dma_ctx)->secure_dma == false) && (isapplet == true)) {
                dev_dbg(&sep->pdev->dev, "[PID%d] handling applet\n",
                        current->pid);

                /* Tail stuff is only for non secure_dma */
                /* Set pointer to first DCB table */
                dcb_table_ptr = (struct sep_dcblock *)
                        (sep->shared_addr +
                        SEP_DRIVER_SYSTEM_DCB_MEMORY_OFFSET_IN_BYTES);

                /**
                 * Go over each DCB and see if
                 * tail pointer must be updated
                 */
                for (i = 0; dma_ctx && *dma_ctx &&
                        i < (*dma_ctx)->nr_dcb_creat; i++, dcb_table_ptr++) {
                        if (dcb_table_ptr->out_vr_tail_pt) {
                                pt_hold = (unsigned long)dcb_table_ptr->
                                        out_vr_tail_pt;
                                tail_pt = (void *)pt_hold;
                                if (is_kva == true) {
                                        error = -ENODEV;
                                        break;
                                } else {
                                        error_temp = copy_to_user(
                                                (void __user *)tail_pt,
                                                dcb_table_ptr->tail_data,
                                                dcb_table_ptr->tail_data_size);
                                }
                                if (error_temp) {
                                        /* Release the DMA resource */
                                        error = -EFAULT;
                                        break;
                                }
                        }
                }
        }

        /* Free the output pages, if any */
        sep_free_dma_table_data_handler(sep, dma_ctx);

        dev_dbg(&sep->pdev->dev, "[PID%d] sep_free_dma_tables_and_dcb end\n",
                                        current->pid);

        return error;
}

/**
 * sep_prepare_dcb_handler - prepare a control block
 * @sep: pointer to struct sep_device
 * @arg: pointer to user parameters
 * @secure_dma: indicate whether we are using secure_dma on IMR
 *
 * This function will retrieve the RAR buffer physical addresses, type
 * & size corresponding to the RAR handles provided in the buffers vector.
 */
static int sep_prepare_dcb_handler(struct sep_device *sep, unsigned long arg,
                                   bool secure_dma,
                                   struct sep_dma_context **dma_ctx)
{
        int error;
        /* Command arguments */
        static struct build_dcb_struct command_args;

        /* Get the command arguments */
        if (copy_from_user(&command_args, (void __user *)arg,
                                        sizeof(struct build_dcb_struct))) {
                error = -EFAULT;
                goto end_function;
        }

        dev_dbg(&sep->pdev->dev,
                "[PID%d] prep dcb handler app_in_address is %08llx\n",
                        current->pid, command_args.app_in_address);
        dev_dbg(&sep->pdev->dev,
                "[PID%d] app_out_address is %08llx\n",
                        current->pid, command_args.app_out_address);
        dev_dbg(&sep->pdev->dev,
                "[PID%d] data_size is %x\n",
                        current->pid, command_args.data_in_size);
        dev_dbg(&sep->pdev->dev,
                "[PID%d] block_size is %x\n",
                        current->pid, command_args.block_size);
        dev_dbg(&sep->pdev->dev,
                "[PID%d] tail block_size is %x\n",
                        current->pid, command_args.tail_block_size);
        dev_dbg(&sep->pdev->dev,
                "[PID%d] is_applet is %x\n",
                        current->pid, command_args.is_applet);

        if (!command_args.app_in_address) {
                dev_warn(&sep->pdev->dev,
                        "[PID%d] null app_in_address\n", current->pid);
                error = -EINVAL;
                goto end_function;
        }

        error = sep_prepare_input_output_dma_table_in_dcb(sep,
                        (unsigned long)command_args.app_in_address,
                        (unsigned long)command_args.app_out_address,
                        command_args.data_in_size, command_args.block_size,
                        command_args.tail_block_size,
                        command_args.is_applet, false,
                        secure_dma, NULL, NULL, dma_ctx, NULL, NULL);

end_function:
        return error;

}

/**
 * sep_free_dcb_handler - free control block resources
 * @sep: pointer to struct sep_device
 *
 * This function frees the DCB resources and updates the needed
 * user-space buffers.
 */
static int sep_free_dcb_handler(struct sep_device *sep,
                                struct sep_dma_context **dma_ctx)
{
        if (!dma_ctx || !(*dma_ctx)) {
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] no dma context defined, nothing to free\n",
                        current->pid);
                return -EINVAL;
        }

        dev_dbg(&sep->pdev->dev, "[PID%d] free dcbs num of DCBs %x\n",
                current->pid,
                (*dma_ctx)->nr_dcb_creat);

        return sep_free_dma_tables_and_dcb(sep, false, false, dma_ctx);
}

/**
 * sep_ioctl - ioctl handler for sep device
 * @filp: pointer to struct file
 * @cmd: command
 * @arg: pointer to argument structure
 *
 * Implement the ioctl methods available on the SEP device.
 */
static long sep_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
        struct sep_private_data * const private_data = filp->private_data;
        struct sep_call_status *call_status = &private_data->call_status;
        struct sep_device *sep = private_data->device;
        struct sep_dma_context **dma_ctx = &private_data->dma_ctx;
        struct sep_queue_info **my_queue_elem = &private_data->my_queue_elem;
        int error = 0;

        dev_dbg(&sep->pdev->dev, "[PID%d] ioctl cmd 0x%x\n",
                current->pid, cmd);
        dev_dbg(&sep->pdev->dev, "[PID%d] dma context addr 0x%p\n",
                current->pid, *dma_ctx);

        /* Make sure we own this device */
        error = sep_check_transaction_owner(sep);
        if (error) {
                dev_dbg(&sep->pdev->dev, "[PID%d] ioctl pid is not owner\n",
                        current->pid);
                goto end_function;
        }

        /* Check that sep_mmap has been called before */
        if (0 == test_bit(SEP_LEGACY_MMAP_DONE_OFFSET,
                                &call_status->status)) {
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] mmap not called\n", current->pid);
                error = -EPROTO;
                goto end_function;
        }

        /* Check that the command is for SEP device */
        if (_IOC_TYPE(cmd) != SEP_IOC_MAGIC_NUMBER) {
                error = -ENOTTY;
                goto end_function;
        }

        switch (cmd) {
        case SEP_IOCSENDSEPCOMMAND:
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] SEP_IOCSENDSEPCOMMAND start\n",
                        current->pid);
                if (1 == test_bit(SEP_LEGACY_SENDMSG_DONE_OFFSET,
                                  &call_status->status)) {
                        dev_warn(&sep->pdev->dev,
                                "[PID%d] send msg already done\n",
                                current->pid);
                        error = -EPROTO;
                        goto end_function;
                }
                /* Send command to SEP */
                error = sep_send_command_handler(sep);
                if (!error)
                        set_bit(SEP_LEGACY_SENDMSG_DONE_OFFSET,
                                &call_status->status);
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] SEP_IOCSENDSEPCOMMAND end\n",
                        current->pid);
                break;
        case SEP_IOCENDTRANSACTION:
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] SEP_IOCENDTRANSACTION start\n",
                        current->pid);
                error = sep_end_transaction_handler(sep, dma_ctx, call_status,
                                                    my_queue_elem);
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] SEP_IOCENDTRANSACTION end\n",
                        current->pid);
                break;
        case SEP_IOCPREPAREDCB:
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] SEP_IOCPREPAREDCB start\n",
                        current->pid);
        case SEP_IOCPREPAREDCB_SECURE_DMA:
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] SEP_IOCPREPAREDCB_SECURE_DMA start\n",
                        current->pid);
                if (1 == test_bit(SEP_LEGACY_SENDMSG_DONE_OFFSET,
                                  &call_status->status)) {
                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] dcb prep needed before send msg\n",
                                current->pid);
                        error = -EPROTO;
                        goto end_function;
                }

                if (!arg) {
                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] dcb null arg\n", current->pid);
                        error = -EINVAL;
                        goto end_function;
                }

                if (cmd == SEP_IOCPREPAREDCB) {
                        /* No secure dma */
                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] SEP_IOCPREPAREDCB (no secure_dma)\n",
                                current->pid);

                        error = sep_prepare_dcb_handler(sep, arg, false,
                                dma_ctx);
                } else {
                        /* Secure dma */
                        dev_dbg(&sep->pdev->dev,
                                "[PID%d] SEP_IOC_POC (with secure_dma)\n",
                                current->pid);

                        error = sep_prepare_dcb_handler(sep, arg, true,
                                dma_ctx);
                }
                dev_dbg(&sep->pdev->dev, "[PID%d] dcb's end\n",
                        current->pid);
                break;
        case SEP_IOCFREEDCB:
                dev_dbg(&sep->pdev->dev, "[PID%d] SEP_IOCFREEDCB start\n",
                        current->pid);
        case SEP_IOCFREEDCB_SECURE_DMA:
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] SEP_IOCFREEDCB_SECURE_DMA start\n",
                        current->pid);
                error = sep_free_dcb_handler(sep, dma_ctx);
                dev_dbg(&sep->pdev->dev, "[PID%d] SEP_IOCFREEDCB end\n",
                        current->pid);
                break;
        default:
                error = -ENOTTY;
                dev_dbg(&sep->pdev->dev, "[PID%d] default end\n",
                        current->pid);
                break;
        }

end_function:
        dev_dbg(&sep->pdev->dev, "[PID%d] ioctl end\n", current->pid);

        return error;
}

/**
 * sep_inthandler - interrupt handler for sep device
 * @irq: interrupt
 * @dev_id: device id
 */
static irqreturn_t sep_inthandler(int irq, void *dev_id)
{
        unsigned long lock_irq_flag;
        u32 reg_val, reg_val2 = 0;
        struct sep_device *sep = dev_id;
        irqreturn_t int_error = IRQ_HANDLED;

        /* Are we in power save? */
#if defined(CONFIG_PM_RUNTIME) && defined(SEP_ENABLE_RUNTIME_PM)
        if (sep->pdev->dev.power.runtime_status != RPM_ACTIVE) {
                dev_dbg(&sep->pdev->dev, "interrupt during pwr save\n");
                return IRQ_NONE;
        }
#endif

        if (test_bit(SEP_WORKING_LOCK_BIT, &sep->in_use_flags) == 0) {
                dev_dbg(&sep->pdev->dev, "interrupt while nobody using sep\n");
                return IRQ_NONE;
        }

        /* Read the IRR register to check if this is SEP interrupt */
        reg_val = sep_read_reg(sep, HW_HOST_IRR_REG_ADDR);

        dev_dbg(&sep->pdev->dev, "sep int: IRR REG val: %x\n", reg_val);

        if (reg_val & (0x1 << 13)) {

                /* Lock and update the counter of reply messages */
                spin_lock_irqsave(&sep->snd_rply_lck, lock_irq_flag);
                sep->reply_ct++;
                spin_unlock_irqrestore(&sep->snd_rply_lck, lock_irq_flag);

                dev_dbg(&sep->pdev->dev, "sep int: send_ct %lx reply_ct %lx\n",
                                        sep->send_ct, sep->reply_ct);

                /* Is this a kernel client request */
                if (sep->in_kernel) {
                        tasklet_schedule(&sep->finish_tasklet);
                        goto finished_interrupt;
                }

                /* Is this printf or daemon request? */
                reg_val2 = sep_read_reg(sep, HW_HOST_SEP_HOST_GPR2_REG_ADDR);
                dev_dbg(&sep->pdev->dev,
                        "SEP Interrupt - GPR2 is %08x\n", reg_val2);

                clear_bit(SEP_WORKING_LOCK_BIT, &sep->in_use_flags);

                if ((reg_val2 >> 30) & 0x1) {
                        dev_dbg(&sep->pdev->dev, "int: printf request\n");
                } else if (reg_val2 >> 31) {
                        dev_dbg(&sep->pdev->dev, "int: daemon request\n");
                } else {
                        dev_dbg(&sep->pdev->dev, "int: SEP reply\n");
                        wake_up(&sep->event_interrupt);
                }
        } else {
                dev_dbg(&sep->pdev->dev, "int: not SEP interrupt\n");
                int_error = IRQ_NONE;
        }

finished_interrupt:

        if (int_error == IRQ_HANDLED)
                sep_write_reg(sep, HW_HOST_ICR_REG_ADDR, reg_val);

        return int_error;
}

/**
 * sep_reconfig_shared_area - reconfigure shared area
 * @sep: pointer to struct sep_device
 *
 * Reconfig the shared area between HOST and SEP - needed in case
 * the DX_CC_Init function was called before OS loading.
 */
static int sep_reconfig_shared_area(struct sep_device *sep)
{
        int ret_val;

        /* use to limit waiting for SEP */
        unsigned long end_time;

        /* Send the new SHARED MESSAGE AREA to the SEP */
        dev_dbg(&sep->pdev->dev, "reconfig shared; sending %08llx to sep\n",
                                (unsigned long long)sep->shared_bus);

        sep_write_reg(sep, HW_HOST_HOST_SEP_GPR1_REG_ADDR, sep->shared_bus);

        /* Poll for SEP response */
        ret_val = sep_read_reg(sep, HW_HOST_SEP_HOST_GPR1_REG_ADDR);

        end_time = jiffies + (WAIT_TIME * HZ);

        while ((time_before(jiffies, end_time)) && (ret_val != 0xffffffff) &&
                (ret_val != sep->shared_bus))
                ret_val = sep_read_reg(sep, HW_HOST_SEP_HOST_GPR1_REG_ADDR);

        /* Check the return value (register) */
        if (ret_val != sep->shared_bus) {
                dev_warn(&sep->pdev->dev, "could not reconfig shared area\n");
                dev_warn(&sep->pdev->dev, "result was %x\n", ret_val);
                ret_val = -ENOMEM;
        } else
                ret_val = 0;

        dev_dbg(&sep->pdev->dev, "reconfig shared area end\n");

        return ret_val;
}

/**
 *      sep_activate_dcb_dmatables_context - Takes DCB & DMA tables
 *                                              contexts into use
 *      @sep: SEP device
 *      @dcb_region: DCB region copy
 *      @dmatables_region: MLLI/DMA tables copy
 *      @dma_ctx: DMA context for current transaction
 */
ssize_t sep_activate_dcb_dmatables_context(struct sep_device *sep,
                                        struct sep_dcblock **dcb_region,
                                        void **dmatables_region,
                                        struct sep_dma_context *dma_ctx)
{
        void *dmaregion_free_start = NULL;
        void *dmaregion_free_end = NULL;
        void *dcbregion_free_start = NULL;
        void *dcbregion_free_end = NULL;
        ssize_t error = 0;

        dev_dbg(&sep->pdev->dev, "[PID%d] activating dcb/dma region\n",
                current->pid);

        if (1 > dma_ctx->nr_dcb_creat) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] invalid number of dcbs to activate 0x%08X\n",
                         current->pid, dma_ctx->nr_dcb_creat);
                error = -EINVAL;
                goto end_function;
        }

        dmaregion_free_start = sep->shared_addr
                                + SYNCHRONIC_DMA_TABLES_AREA_OFFSET_BYTES;
        dmaregion_free_end = dmaregion_free_start
                                + SYNCHRONIC_DMA_TABLES_AREA_SIZE_BYTES - 1;

        if (dmaregion_free_start
             + dma_ctx->dmatables_len > dmaregion_free_end) {
                error = -ENOMEM;
                goto end_function;
        }
        memcpy(dmaregion_free_start,
               *dmatables_region,
               dma_ctx->dmatables_len);
        /* Free MLLI table copy */
        kfree(*dmatables_region);
        *dmatables_region = NULL;

        /* Copy thread's DCB  table copy to DCB table region */
        dcbregion_free_start = sep->shared_addr +
                                SEP_DRIVER_SYSTEM_DCB_MEMORY_OFFSET_IN_BYTES;
        dcbregion_free_end = dcbregion_free_start +
                                (SEP_MAX_NUM_SYNC_DMA_OPS *
                                        sizeof(struct sep_dcblock)) - 1;

        if (dcbregion_free_start
             + (dma_ctx->nr_dcb_creat * sizeof(struct sep_dcblock))
             > dcbregion_free_end) {
                error = -ENOMEM;
                goto end_function;
        }

        memcpy(dcbregion_free_start,
               *dcb_region,
               dma_ctx->nr_dcb_creat * sizeof(struct sep_dcblock));

        /* Print the tables */
        dev_dbg(&sep->pdev->dev, "activate: input table\n");
        sep_debug_print_lli_tables(sep,
                (struct sep_lli_entry *)sep_shared_area_bus_to_virt(sep,
                (*dcb_region)->input_mlli_address),
                (*dcb_region)->input_mlli_num_entries,
                (*dcb_region)->input_mlli_data_size);

        dev_dbg(&sep->pdev->dev, "activate: output table\n");
        sep_debug_print_lli_tables(sep,
                (struct sep_lli_entry *)sep_shared_area_bus_to_virt(sep,
                (*dcb_region)->output_mlli_address),
                (*dcb_region)->output_mlli_num_entries,
                (*dcb_region)->output_mlli_data_size);

        dev_dbg(&sep->pdev->dev,
                 "[PID%d] printing activated tables\n", current->pid);

end_function:
        kfree(*dmatables_region);
        *dmatables_region = NULL;

        kfree(*dcb_region);
        *dcb_region = NULL;

        return error;
}

/**
 *      sep_create_dcb_dmatables_context - Creates DCB & MLLI/DMA table context
 *      @sep: SEP device
 *      @dcb_region: DCB region buf to create for current transaction
 *      @dmatables_region: MLLI/DMA tables buf to create for current transaction
 *      @dma_ctx: DMA context buf to create for current transaction
 *      @user_dcb_args: User arguments for DCB/MLLI creation
 *      @num_dcbs: Number of DCBs to create
 *      @secure_dma: Indicate use of IMR restricted memory secure dma
 */
static ssize_t sep_create_dcb_dmatables_context(struct sep_device *sep,
                        struct sep_dcblock **dcb_region,
                        void **dmatables_region,
                        struct sep_dma_context **dma_ctx,
                        const struct build_dcb_struct __user *user_dcb_args,
                        const u32 num_dcbs, bool secure_dma)
{
        int error = 0;
        int i = 0;
        struct build_dcb_struct *dcb_args = NULL;

        dev_dbg(&sep->pdev->dev, "[PID%d] creating dcb/dma region\n",
                current->pid);

        if (!dcb_region || !dma_ctx || !dmatables_region || !user_dcb_args) {
                error = -EINVAL;
                goto end_function;
        }

        if (SEP_MAX_NUM_SYNC_DMA_OPS < num_dcbs) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] invalid number of dcbs 0x%08X\n",
                         current->pid, num_dcbs);
                error = -EINVAL;
                goto end_function;
        }

        dcb_args = kzalloc(num_dcbs * sizeof(struct build_dcb_struct),
                           GFP_KERNEL);
        if (!dcb_args) {
                dev_warn(&sep->pdev->dev, "[PID%d] no memory for dcb args\n",
                         current->pid);
                error = -ENOMEM;
                goto end_function;
        }

        if (copy_from_user(dcb_args,
                        user_dcb_args,
                        num_dcbs * sizeof(struct build_dcb_struct))) {
                error = -EINVAL;
                goto end_function;
        }

        /* Allocate thread-specific memory for DCB */
        *dcb_region = kzalloc(num_dcbs * sizeof(struct sep_dcblock),
                              GFP_KERNEL);
        if (!(*dcb_region)) {
                error = -ENOMEM;
                goto end_function;
        }

        /* Prepare DCB and MLLI table into the allocated regions */
        for (i = 0; i < num_dcbs; i++) {
                error = sep_prepare_input_output_dma_table_in_dcb(sep,
                                (unsigned long)dcb_args[i].app_in_address,
                                (unsigned long)dcb_args[i].app_out_address,
                                dcb_args[i].data_in_size,
                                dcb_args[i].block_size,
                                dcb_args[i].tail_block_size,
                                dcb_args[i].is_applet,
                                false, secure_dma,
                                *dcb_region, dmatables_region,
                                dma_ctx,
                                NULL,
                                NULL);
                if (error) {
                        dev_warn(&sep->pdev->dev,
                                 "[PID%d] dma table creation failed\n",
                                 current->pid);
                        goto end_function;
                }

                if (dcb_args[i].app_in_address != 0)
                        (*dma_ctx)->input_data_len += dcb_args[i].data_in_size;
        }

end_function:
        kfree(dcb_args);
        return error;

}

/**
 *      sep_create_dcb_dmatables_context_kernel - Creates DCB & MLLI/DMA table context
 *      for kernel crypto
 *      @sep: SEP device
 *      @dcb_region: DCB region buf to create for current transaction
 *      @dmatables_region: MLLI/DMA tables buf to create for current transaction
 *      @dma_ctx: DMA context buf to create for current transaction
 *      @user_dcb_args: User arguments for DCB/MLLI creation
 *      @num_dcbs: Number of DCBs to create
 *      This does that same thing as sep_create_dcb_dmatables_context
 *      except that it is used only for the kernel crypto operation. It is
 *      separate because there is no user data involved; the dcb data structure
 *      is specific for kernel crypto (build_dcb_struct_kernel)
 */
int sep_create_dcb_dmatables_context_kernel(struct sep_device *sep,
                        struct sep_dcblock **dcb_region,
                        void **dmatables_region,
                        struct sep_dma_context **dma_ctx,
                        const struct build_dcb_struct_kernel *dcb_data,
                        const u32 num_dcbs)
{
        int error = 0;
        int i = 0;

        dev_dbg(&sep->pdev->dev, "[PID%d] creating dcb/dma region\n",
                current->pid);

        if (!dcb_region || !dma_ctx || !dmatables_region || !dcb_data) {
                error = -EINVAL;
                goto end_function;
        }

        if (SEP_MAX_NUM_SYNC_DMA_OPS < num_dcbs) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] invalid number of dcbs 0x%08X\n",
                         current->pid, num_dcbs);
                error = -EINVAL;
                goto end_function;
        }

        dev_dbg(&sep->pdev->dev, "[PID%d] num_dcbs is %d\n",
                current->pid, num_dcbs);

        /* Allocate thread-specific memory for DCB */
        *dcb_region = kzalloc(num_dcbs * sizeof(struct sep_dcblock),
                              GFP_KERNEL);
        if (!(*dcb_region)) {
                error = -ENOMEM;
                goto end_function;
        }

        /* Prepare DCB and MLLI table into the allocated regions */
        for (i = 0; i < num_dcbs; i++) {
                error = sep_prepare_input_output_dma_table_in_dcb(sep,
                                (unsigned long)dcb_data->app_in_address,
                                (unsigned long)dcb_data->app_out_address,
                                dcb_data->data_in_size,
                                dcb_data->block_size,
                                dcb_data->tail_block_size,
                                dcb_data->is_applet,
                                true,
                                false,
                                *dcb_region, dmatables_region,
                                dma_ctx,
                                dcb_data->src_sg,
                                dcb_data->dst_sg);
                if (error) {
                        dev_warn(&sep->pdev->dev,
                                 "[PID%d] dma table creation failed\n",
                                 current->pid);
                        goto end_function;
                }
        }

end_function:
        return error;

}

/**
 *      sep_activate_msgarea_context - Takes the message area context into use
 *      @sep: SEP device
 *      @msg_region: Message area context buf
 *      @msg_len: Message area context buffer size
 */
static ssize_t sep_activate_msgarea_context(struct sep_device *sep,
                                            void **msg_region,
                                            const size_t msg_len)
{
        dev_dbg(&sep->pdev->dev, "[PID%d] activating msg region\n",
                current->pid);

        if (!msg_region || !(*msg_region) ||
            SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES < msg_len) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] invalid act msgarea len 0x%08zX\n",
                         current->pid, msg_len);
                return -EINVAL;
        }

        memcpy(sep->shared_addr, *msg_region, msg_len);

        return 0;
}

/**
 *      sep_create_msgarea_context - Creates message area context
 *      @sep: SEP device
 *      @msg_region: Msg area region buf to create for current transaction
 *      @msg_user: Content for msg area region from user
 *      @msg_len: Message area size
 */
static ssize_t sep_create_msgarea_context(struct sep_device *sep,
                                          void **msg_region,
                                          const void __user *msg_user,
                                          const size_t msg_len)
{
        int error = 0;

        dev_dbg(&sep->pdev->dev, "[PID%d] creating msg region\n",
                current->pid);

        if (!msg_region ||
            !msg_user ||
            SEP_DRIVER_MAX_MESSAGE_SIZE_IN_BYTES < msg_len ||
            SEP_DRIVER_MIN_MESSAGE_SIZE_IN_BYTES > msg_len) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] invalid creat msgarea len 0x%08zX\n",
                         current->pid, msg_len);
                error = -EINVAL;
                goto end_function;
        }

        /* Allocate thread-specific memory for message buffer */
        *msg_region = kzalloc(msg_len, GFP_KERNEL);
        if (!(*msg_region)) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] no mem for msgarea context\n",
                         current->pid);
                error = -ENOMEM;
                goto end_function;
        }

        /* Copy input data to write() to allocated message buffer */
        if (copy_from_user(*msg_region, msg_user, msg_len)) {
                error = -EINVAL;
                goto end_function;
        }

end_function:
        if (error && msg_region) {
                kfree(*msg_region);
                *msg_region = NULL;
        }

        return error;
}


/**
 *      sep_read - Returns results of an operation for fastcall interface
 *      @filp: File pointer
 *      @buf_user: User buffer for storing results
 *      @count_user: User buffer size
 *      @offset: File offset, not supported
 *
 *      The implementation does not support reading in chunks, all data must be
 *      consumed during a single read system call.
 */
static ssize_t sep_read(struct file *filp,
                        char __user *buf_user, size_t count_user,
                        loff_t *offset)
{
        struct sep_private_data * const private_data = filp->private_data;
        struct sep_call_status *call_status = &private_data->call_status;
        struct sep_device *sep = private_data->device;
        struct sep_dma_context **dma_ctx = &private_data->dma_ctx;
        struct sep_queue_info **my_queue_elem = &private_data->my_queue_elem;
        ssize_t error = 0, error_tmp = 0;

        /* Am I the process that owns the transaction? */
        error = sep_check_transaction_owner(sep);
        if (error) {
                dev_dbg(&sep->pdev->dev, "[PID%d] read pid is not owner\n",
                        current->pid);
                goto end_function;
        }

        /* Checks that user has called necessary apis */
        if (0 == test_bit(SEP_FASTCALL_WRITE_DONE_OFFSET,
                        &call_status->status)) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] fastcall write not called\n",
                         current->pid);
                error = -EPROTO;
                goto end_function_error;
        }

        if (!buf_user) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] null user buffer\n",
                         current->pid);
                error = -EINVAL;
                goto end_function_error;
        }


        /* Wait for SEP to finish */
        wait_event(sep->event_interrupt,
                   test_bit(SEP_WORKING_LOCK_BIT,
                            &sep->in_use_flags) == 0);

        sep_dump_message(sep);

        dev_dbg(&sep->pdev->dev, "[PID%d] count_user = 0x%08zX\n",
                current->pid, count_user);

        /* In case user has allocated bigger buffer */
        if (count_user > SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES)
                count_user = SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES;

        if (copy_to_user(buf_user, sep->shared_addr, count_user)) {
                error = -EFAULT;
                goto end_function_error;
        }

        dev_dbg(&sep->pdev->dev, "[PID%d] read succeeded\n", current->pid);
        error = count_user;

end_function_error:
        /* Copy possible tail data to user and free DCB and MLLIs */
        error_tmp = sep_free_dcb_handler(sep, dma_ctx);
        if (error_tmp)
                dev_warn(&sep->pdev->dev, "[PID%d] dcb free failed\n",
                        current->pid);

        /* End the transaction, wakeup pending ones */
        error_tmp = sep_end_transaction_handler(sep, dma_ctx, call_status,
                my_queue_elem);
        if (error_tmp)
                dev_warn(&sep->pdev->dev,
                         "[PID%d] ending transaction failed\n",
                         current->pid);

end_function:
        return error;
}

/**
 *      sep_fastcall_args_get - Gets fastcall params from user
 *      sep: SEP device
 *      @args: Parameters buffer
 *      @buf_user: User buffer for operation parameters
 *      @count_user: User buffer size
 */
static inline ssize_t sep_fastcall_args_get(struct sep_device *sep,
                                            struct sep_fastcall_hdr *args,
                                            const char __user *buf_user,
                                            const size_t count_user)
{
        ssize_t error = 0;
        size_t actual_count = 0;

        if (!buf_user) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] null user buffer\n",
                         current->pid);
                error = -EINVAL;
                goto end_function;
        }

        if (count_user < sizeof(struct sep_fastcall_hdr)) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] too small message size 0x%08zX\n",
                         current->pid, count_user);
                error = -EINVAL;
                goto end_function;
        }


        if (copy_from_user(args, buf_user, sizeof(struct sep_fastcall_hdr))) {
                error = -EFAULT;
                goto end_function;
        }

        if (SEP_FC_MAGIC != args->magic) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] invalid fastcall magic 0x%08X\n",
                         current->pid, args->magic);
                error = -EINVAL;
                goto end_function;
        }

        dev_dbg(&sep->pdev->dev, "[PID%d] fastcall hdr num of DCBs 0x%08X\n",
                current->pid, args->num_dcbs);
        dev_dbg(&sep->pdev->dev, "[PID%d] fastcall hdr msg len 0x%08X\n",
                current->pid, args->msg_len);

        if (SEP_DRIVER_MAX_MESSAGE_SIZE_IN_BYTES < args->msg_len ||
            SEP_DRIVER_MIN_MESSAGE_SIZE_IN_BYTES > args->msg_len) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] invalid message length\n",
                         current->pid);
                error = -EINVAL;
                goto end_function;
        }

        actual_count = sizeof(struct sep_fastcall_hdr)
                        + args->msg_len
                        + (args->num_dcbs * sizeof(struct build_dcb_struct));

        if (actual_count != count_user) {
                dev_warn(&sep->pdev->dev,
                         "[PID%d] inconsistent message "
                         "sizes 0x%08zX vs 0x%08zX\n",
                         current->pid, actual_count, count_user);
                error = -EMSGSIZE;
                goto end_function;
        }

end_function:
        return error;
}

/**
 *      sep_write - Starts an operation for fastcall interface
 *      @filp: File pointer
 *      @buf_user: User buffer for operation parameters
 *      @count_user: User buffer size
 *      @offset: File offset, not supported
 *
 *      The implementation does not support writing in chunks,
 *      all data must be given during a single write system call.
 */
static ssize_t sep_write(struct file *filp,
                         const char __user *buf_user, size_t count_user,
                         loff_t *offset)
{
        struct sep_private_data * const private_data = filp->private_data;
        struct sep_call_status *call_status = &private_data->call_status;
        struct sep_device *sep = private_data->device;
        struct sep_dma_context *dma_ctx = NULL;
        struct sep_fastcall_hdr call_hdr = {0};
        void *msg_region = NULL;
        void *dmatables_region = NULL;
        struct sep_dcblock *dcb_region = NULL;
        ssize_t error = 0;
        struct sep_queue_info *my_queue_elem = NULL;
        bool my_secure_dma; /* are we using secure_dma (IMR)? */

        dev_dbg(&sep->pdev->dev, "[PID%d] sep dev is 0x%p\n",
                current->pid, sep);
        dev_dbg(&sep->pdev->dev, "[PID%d] private_data is 0x%p\n",
                current->pid, private_data);

        error = sep_fastcall_args_get(sep, &call_hdr, buf_user, count_user);
        if (error)
                goto end_function;

        buf_user += sizeof(struct sep_fastcall_hdr);

        if (call_hdr.secure_dma == 0)
                my_secure_dma = false;
        else
                my_secure_dma = true;

        /*
         * Controlling driver memory usage by limiting amount of
         * buffers created. Only SEP_DOUBLEBUF_USERS_LIMIT number
         * of threads can progress further at a time
         */
        dev_dbg(&sep->pdev->dev,
                "[PID%d] waiting for double buffering region access\n",
                current->pid);
        error = down_interruptible(&sep->sep_doublebuf);
        dev_dbg(&sep->pdev->dev, "[PID%d] double buffering region start\n",
                                        current->pid);
        if (error) {
                /* Signal received */
                goto end_function_error;
        }


        /*
         * Prepare contents of the shared area regions for
         * the operation into temporary buffers
         */
        if (0 < call_hdr.num_dcbs) {
                error = sep_create_dcb_dmatables_context(sep,
                                &dcb_region,
                                &dmatables_region,
                                &dma_ctx,
                                (const struct build_dcb_struct __user *)
                                        buf_user,
                                call_hdr.num_dcbs, my_secure_dma);
                if (error)
                        goto end_function_error_doublebuf;

                buf_user += call_hdr.num_dcbs * sizeof(struct build_dcb_struct);
        }

        error = sep_create_msgarea_context(sep,
                                           &msg_region,
                                           buf_user,
                                           call_hdr.msg_len);
        if (error)
                goto end_function_error_doublebuf;

        dev_dbg(&sep->pdev->dev, "[PID%d] updating queue status\n",
                                                        current->pid);
        my_queue_elem = sep_queue_status_add(sep,
                                ((struct sep_msgarea_hdr *)msg_region)->opcode,
                                (dma_ctx) ? dma_ctx->input_data_len : 0,
                                     current->pid,
                                     current->comm, sizeof(current->comm));

        if (!my_queue_elem) {
                dev_dbg(&sep->pdev->dev,
                        "[PID%d] updating queue status error\n", current->pid);
                error = -ENOMEM;
                goto end_function_error_doublebuf;
        }

        /* Wait until current process gets the transaction */
        error = sep_wait_transaction(sep);

        if (error) {
                /* Interrupted by signal, don't clear transaction */
                dev_dbg(&sep->pdev->dev, "[PID%d] interrupted by signal\n",
                        current->pid);
                sep_queue_status_remove(sep, &my_queue_elem);
                goto end_function_error_doublebuf;
        }

        dev_dbg(&sep->pdev->dev, "[PID%d] saving queue element\n",
                current->pid);
        private_data->my_queue_elem = my_queue_elem;

        /* Activate shared area regions for the transaction */
        error = sep_activate_msgarea_context(sep, &msg_region,
                                             call_hdr.msg_len);
        if (error)
                goto end_function_error_clear_transact;

        sep_dump_message(sep);

        if (0 < call_hdr.num_dcbs) {
                error = sep_activate_dcb_dmatables_context(sep,
                                &dcb_region,
                                &dmatables_region,
                                dma_ctx);
                if (error)
                        goto end_function_error_clear_transact;
        }

        /* Send command to SEP */
        error = sep_send_command_handler(sep);
        if (error)
                goto end_function_error_clear_transact;

        /* Store DMA context for the transaction */
        private_data->dma_ctx = dma_ctx;
        /* Update call status */
        set_bit(SEP_FASTCALL_WRITE_DONE_OFFSET, &call_status->status);
        error = count_user;

        up(&sep->sep_doublebuf);
        dev_dbg(&sep->pdev->dev, "[PID%d] double buffering region end\n",
                current->pid);

        goto end_function;

end_function_error_clear_transact:
        sep_end_transaction_handler(sep, &dma_ctx, call_status,
                                                &private_data->my_queue_elem);

end_function_error_doublebuf:
        up(&sep->sep_doublebuf);
        dev_dbg(&sep->pdev->dev, "[PID%d] double buffering region end\n",
                current->pid);

end_function_error:
        if (dma_ctx)
                sep_free_dma_table_data_handler(sep, &dma_ctx);

end_function:
        kfree(dcb_region);
        kfree(dmatables_region);
        kfree(msg_region);

        return error;
}
/**
 *      sep_seek - Handler for seek system call
 *      @filp: File pointer
 *      @offset: File offset
 *      @origin: Options for offset
 *
 *      Fastcall interface does not support seeking, all reads
 *      and writes are from/to offset zero
 */
static loff_t sep_seek(struct file *filp, loff_t offset, int origin)
{
        return -ENOSYS;
}



/**
 * sep_file_operations - file operation on sep device
 * @sep_ioctl:  ioctl handler from user space call
 * @sep_poll:   poll handler
 * @sep_open:   handles sep device open request
 * @sep_release:handles sep device release request
 * @sep_mmap:   handles memory mapping requests
 * @sep_read:   handles read request on sep device
 * @sep_write:  handles write request on sep device
 * @sep_seek:   handles seek request on sep device
 */
static const struct file_operations sep_file_operations = {
        .owner = THIS_MODULE,
        .unlocked_ioctl = sep_ioctl,
        .poll = sep_poll,
        .open = sep_open,
        .release = sep_release,
        .mmap = sep_mmap,
        .read = sep_read,
        .write = sep_write,
        .llseek = sep_seek,
};

/**
 * sep_sysfs_read - read sysfs entry per gives arguments
 * @filp: file pointer
 * @kobj: kobject pointer
 * @attr: binary file attributes
 * @buf: read to this buffer
 * @pos: offset to read
 * @count: amount of data to read
 *
 * This function is to read sysfs entries for sep driver per given arguments.
 */
static ssize_t
sep_sysfs_read(struct file *filp, struct kobject *kobj,
                struct bin_attribute *attr,
                char *buf, loff_t pos, size_t count)
{
        unsigned long lck_flags;
        size_t nleft = count;
        struct sep_device *sep = sep_dev;
        struct sep_queue_info *queue_elem = NULL;
        u32 queue_num = 0;
        u32 i = 1;

        spin_lock_irqsave(&sep->sep_queue_lock, lck_flags);

        queue_num = sep->sep_queue_num;
        if (queue_num > SEP_DOUBLEBUF_USERS_LIMIT)
                queue_num = SEP_DOUBLEBUF_USERS_LIMIT;


        if (count < sizeof(queue_num)
                        + (queue_num * sizeof(struct sep_queue_data))) {
                spin_unlock_irqrestore(&sep->sep_queue_lock, lck_flags);
                return -EINVAL;
        }

        memcpy(buf, &queue_num, sizeof(queue_num));
        buf += sizeof(queue_num);
        nleft -= sizeof(queue_num);

        list_for_each_entry(queue_elem, &sep->sep_queue_status, list) {
                if (i++ > queue_num)
                        break;

                memcpy(buf, &queue_elem->data, sizeof(queue_elem->data));
                nleft -= sizeof(queue_elem->data);
                buf += sizeof(queue_elem->data);
        }
        spin_unlock_irqrestore(&sep->sep_queue_lock, lck_flags);

        return count - nleft;
}

/**
 * bin_attributes - defines attributes for queue_status
 * @attr: attributes (name & permissions)
 * @read: function pointer to read this file
 * @size: maxinum size of binary attribute
 */
static const struct bin_attribute queue_status = {
        .attr = {.name = "queue_status", .mode = 0444},
        .read = sep_sysfs_read,
        .size = sizeof(u32)
                + (SEP_DOUBLEBUF_USERS_LIMIT * sizeof(struct sep_queue_data)),
};

/**
 * sep_register_driver_with_fs - register misc devices
 * @sep: pointer to struct sep_device
 *
 * This function registers the driver with the file system
 */
static int sep_register_driver_with_fs(struct sep_device *sep)
{
        int ret_val;

        sep->miscdev_sep.minor = MISC_DYNAMIC_MINOR;
        sep->miscdev_sep.name = SEP_DEV_NAME;
        sep->miscdev_sep.fops = &sep_file_operations;

        ret_val = misc_register(&sep->miscdev_sep);
        if (ret_val) {
                dev_warn(&sep->pdev->dev, "misc reg fails for SEP %x\n",
                        ret_val);
                return ret_val;
        }

        ret_val = device_create_bin_file(sep->miscdev_sep.this_device,
                                                                &queue_status);
        if (ret_val) {
                dev_warn(&sep->pdev->dev, "sysfs attribute1 fails for SEP %x\n",
                        ret_val);
                return ret_val;
        }

        return ret_val;
}


/**
 *sep_probe - probe a matching PCI device
 *@pdev:        pci_device
 *@ent: pci_device_id
 *
 *Attempt to set up and configure a SEP device that has been
 *discovered by the PCI layer. Allocates all required resources.
 */
static int __devinit sep_probe(struct pci_dev *pdev,
        const struct pci_device_id *ent)
{
        int error = 0;
        struct sep_device *sep = NULL;

        if (sep_dev != NULL) {
                dev_dbg(&pdev->dev, "only one SEP supported.\n");
                return -EBUSY;
        }

        /* Enable the device */
        error = pci_enable_device(pdev);
        if (error) {
                dev_warn(&pdev->dev, "error enabling pci device\n");
                goto end_function;
        }

        /* Allocate the sep_device structure for this device */
        sep_dev = kzalloc(sizeof(struct sep_device), GFP_ATOMIC);
        if (sep_dev == NULL) {
                dev_warn(&pdev->dev,
                        "can't kmalloc the sep_device structure\n");
                error = -ENOMEM;
                goto end_function_disable_device;
        }

        /*
         * We're going to use another variable for actually
         * working with the device; this way, if we have
         * multiple devices in the future, it would be easier
         * to make appropriate changes
         */
        sep = sep_dev;

        sep->pdev = pci_dev_get(pdev);

        init_waitqueue_head(&sep->event_transactions);
        init_waitqueue_head(&sep->event_interrupt);
        spin_lock_init(&sep->snd_rply_lck);
        spin_lock_init(&sep->sep_queue_lock);
        sema_init(&sep->sep_doublebuf, SEP_DOUBLEBUF_USERS_LIMIT);

        INIT_LIST_HEAD(&sep->sep_queue_status);

        dev_dbg(&sep->pdev->dev,
                "sep probe: PCI obtained, device being prepared\n");

        /* Set up our register area */
        sep->reg_physical_addr = pci_resource_start(sep->pdev, 0);
        if (!sep->reg_physical_addr) {
                dev_warn(&sep->pdev->dev, "Error getting register start\n");
                error = -ENODEV;
                goto end_function_free_sep_dev;
        }

        sep->reg_physical_end = pci_resource_end(sep->pdev, 0);
        if (!sep->reg_physical_end) {
                dev_warn(&sep->pdev->dev, "Error getting register end\n");
                error = -ENODEV;
                goto end_function_free_sep_dev;
        }

        sep->reg_addr = ioremap_nocache(sep->reg_physical_addr,
                (size_t)(sep->reg_physical_end - sep->reg_physical_addr + 1));
        if (!sep->reg_addr) {
                dev_warn(&sep->pdev->dev, "Error getting register virtual\n");
                error = -ENODEV;
                goto end_function_free_sep_dev;
        }

        dev_dbg(&sep->pdev->dev,
                "Register area start %llx end %llx virtual %p\n",
                (unsigned long long)sep->reg_physical_addr,
                (unsigned long long)sep->reg_physical_end,
                sep->reg_addr);

        /* Allocate the shared area */
        sep->shared_size = SEP_DRIVER_MESSAGE_SHARED_AREA_SIZE_IN_BYTES +
                SYNCHRONIC_DMA_TABLES_AREA_SIZE_BYTES +
                SEP_DRIVER_DATA_POOL_SHARED_AREA_SIZE_IN_BYTES +
                SEP_DRIVER_STATIC_AREA_SIZE_IN_BYTES +
                SEP_DRIVER_SYSTEM_DATA_MEMORY_SIZE_IN_BYTES;

        if (sep_map_and_alloc_shared_area(sep)) {
                error = -ENOMEM;
                /* Allocation failed */
                goto end_function_error;
        }

        /* Clear ICR register */
        sep_write_reg(sep, HW_HOST_ICR_REG_ADDR, 0xFFFFFFFF);

        /* Set the IMR register - open only GPR 2 */
        sep_write_reg(sep, HW_HOST_IMR_REG_ADDR, (~(0x1 << 13)));

        /* Read send/receive counters from SEP */
        sep->reply_ct = sep_read_reg(sep, HW_HOST_SEP_HOST_GPR2_REG_ADDR);
        sep->reply_ct &= 0x3FFFFFFF;
        sep->send_ct = sep->reply_ct;

        /* Get the interrupt line */
        error = request_irq(pdev->irq, sep_inthandler, IRQF_SHARED,
                "sep_driver", sep);

        if (error)
                goto end_function_deallocate_sep_shared_area;

        /* The new chip requires a shared area reconfigure */
        error = sep_reconfig_shared_area(sep);
        if (error)
                goto end_function_free_irq;

        sep->in_use = 1;

        /* Finally magic up the device nodes */
        /* Register driver with the fs */
        error = sep_register_driver_with_fs(sep);

        if (error) {
                dev_err(&sep->pdev->dev, "error registering dev file\n");
                goto end_function_free_irq;
        }

        sep->in_use = 0; /* through touching the device */
#ifdef SEP_ENABLE_RUNTIME_PM
        pm_runtime_put_noidle(&sep->pdev->dev);
        pm_runtime_allow(&sep->pdev->dev);
        pm_runtime_set_autosuspend_delay(&sep->pdev->dev,
                SUSPEND_DELAY);
        pm_runtime_use_autosuspend(&sep->pdev->dev);
        pm_runtime_mark_last_busy(&sep->pdev->dev);
        sep->power_save_setup = 1;
#endif
        /* register kernel crypto driver */
#if defined(CONFIG_CRYPTO) || defined(CONFIG_CRYPTO_MODULE)
        error = sep_crypto_setup();
        if (error) {
                dev_err(&sep->pdev->dev, "crypto setup failed\n");
                goto end_function_free_irq;
        }
#endif
        goto end_function;

end_function_free_irq:
        free_irq(pdev->irq, sep);

end_function_deallocate_sep_shared_area:
        /* De-allocate shared area */
        sep_unmap_and_free_shared_area(sep);

end_function_error:
        iounmap(sep->reg_addr);

end_function_free_sep_dev:
        pci_dev_put(sep_dev->pdev);
        kfree(sep_dev);
        sep_dev = NULL;

end_function_disable_device:
        pci_disable_device(pdev);

end_function:
        return error;
}

/**
 * sep_remove - handles removing device from pci subsystem
 * @pdev:       pointer to pci device
 *
 * This function will handle removing our sep device from pci subsystem on exit
 * or unloading this module. It should free up all used resources, and unmap if
 * any memory regions mapped.
 */
static void sep_remove(struct pci_dev *pdev)
{
        struct sep_device *sep = sep_dev;

        /* Unregister from fs */
        misc_deregister(&sep->miscdev_sep);

        /* Unregister from kernel crypto */
#if defined(CONFIG_CRYPTO) || defined(CONFIG_CRYPTO_MODULE)
        sep_crypto_takedown();
#endif
        /* Free the irq */
        free_irq(sep->pdev->irq, sep);

        /* Free the shared area  */
        sep_unmap_and_free_shared_area(sep_dev);
        iounmap(sep_dev->reg_addr);

#ifdef SEP_ENABLE_RUNTIME_PM
        if (sep->in_use) {
                sep->in_use = 0;
                pm_runtime_forbid(&sep->pdev->dev);
                pm_runtime_get_noresume(&sep->pdev->dev);
        }
#endif
        pci_dev_put(sep_dev->pdev);
        kfree(sep_dev);
        sep_dev = NULL;
}

/* Initialize struct pci_device_id for our driver */
static DEFINE_PCI_DEVICE_TABLE(sep_pci_id_tbl) = {
        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0826)},
        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x08e9)},
        {0}
};

/* Export our pci_device_id structure to user space */
MODULE_DEVICE_TABLE(pci, sep_pci_id_tbl);

#ifdef SEP_ENABLE_RUNTIME_PM

/**
 * sep_pm_resume - rsume routine while waking up from S3 state
 * @dev:        pointer to sep device
 *
 * This function is to be used to wake up sep driver while system awakes from S3
 * state i.e. suspend to ram. The RAM in intact.
 * Notes - revisit with more understanding of pm, ICR/IMR & counters.
 */
static int sep_pci_resume(struct device *dev)
{
        struct sep_device *sep = sep_dev;

        dev_dbg(&sep->pdev->dev, "pci resume called\n");

        if (sep->power_state == SEP_DRIVER_POWERON)
                return 0;

        /* Clear ICR register */
        sep_write_reg(sep, HW_HOST_ICR_REG_ADDR, 0xFFFFFFFF);

        /* Set the IMR register - open only GPR 2 */
        sep_write_reg(sep, HW_HOST_IMR_REG_ADDR, (~(0x1 << 13)));

        /* Read send/receive counters from SEP */
        sep->reply_ct = sep_read_reg(sep, HW_HOST_SEP_HOST_GPR2_REG_ADDR);
        sep->reply_ct &= 0x3FFFFFFF;
        sep->send_ct = sep->reply_ct;

        sep->power_state = SEP_DRIVER_POWERON;

        return 0;
}

/**
 * sep_pm_suspend - suspend routine while going to S3 state
 * @dev:        pointer to sep device
 *
 * This function is to be used to suspend sep driver while system goes to S3
 * state i.e. suspend to ram. The RAM in intact and ON during this suspend.
 * Notes - revisit with more understanding of pm, ICR/IMR
 */
static int sep_pci_suspend(struct device *dev)
{
        struct sep_device *sep = sep_dev;

        dev_dbg(&sep->pdev->dev, "pci suspend called\n");
        if (sep->in_use == 1)
                return -EAGAIN;

        sep->power_state = SEP_DRIVER_POWEROFF;

        /* Clear ICR register */
        sep_write_reg(sep, HW_HOST_ICR_REG_ADDR, 0xFFFFFFFF);

        /* Set the IMR to block all */
        sep_write_reg(sep, HW_HOST_IMR_REG_ADDR, 0xFFFFFFFF);

        return 0;
}

/**
 * sep_pm_runtime_resume - runtime resume routine
 * @dev:        pointer to sep device
 *
 * Notes - revisit with more understanding of pm, ICR/IMR & counters
 */
static int sep_pm_runtime_resume(struct device *dev)
{

        u32 retval2;
        u32 delay_count;
        struct sep_device *sep = sep_dev;

        dev_dbg(&sep->pdev->dev, "pm runtime resume called\n");

        /**
         * Wait until the SCU boot is ready
         * This is done by iterating SCU_DELAY_ITERATION (10
         * microseconds each) up to SCU_DELAY_MAX (50) times.
         * This bit can be set in a random time that is less
         * than 500 microseconds after each power resume
         */
        retval2 = 0;
        delay_count = 0;
        while ((!retval2) && (delay_count < SCU_DELAY_MAX)) {
                retval2 = sep_read_reg(sep, HW_HOST_SEP_HOST_GPR3_REG_ADDR);
                retval2 &= 0x00000008;
                if (!retval2) {
                        udelay(SCU_DELAY_ITERATION);
                        delay_count += 1;
                }
        }

        if (!retval2) {
                dev_warn(&sep->pdev->dev, "scu boot bit not set at resume\n");
                return -EINVAL;
        }

        /* Clear ICR register */
        sep_write_reg(sep, HW_HOST_ICR_REG_ADDR, 0xFFFFFFFF);

        /* Set the IMR register - open only GPR 2 */
        sep_write_reg(sep, HW_HOST_IMR_REG_ADDR, (~(0x1 << 13)));

        /* Read send/receive counters from SEP */
        sep->reply_ct = sep_read_reg(sep, HW_HOST_SEP_HOST_GPR2_REG_ADDR);
        sep->reply_ct &= 0x3FFFFFFF;
        sep->send_ct = sep->reply_ct;

        return 0;
}

/**
 * sep_pm_runtime_suspend - runtime suspend routine
 * @dev:        pointer to sep device
 *
 * Notes - revisit with more understanding of pm
 */
static int sep_pm_runtime_suspend(struct device *dev)
{
        struct sep_device *sep = sep_dev;

        dev_dbg(&sep->pdev->dev, "pm runtime suspend called\n");

        /* Clear ICR register */
        sep_write_reg(sep, HW_HOST_ICR_REG_ADDR, 0xFFFFFFFF);
        return 0;
}

/**
 * sep_pm - power management for sep driver
 * @sep_pm_runtime_resume:      resume- no communication with cpu & main memory
 * @sep_pm_runtime_suspend:     suspend- no communication with cpu & main memory
 * @sep_pci_suspend:            suspend - main memory is still ON
 * @sep_pci_resume:             resume - main memory is still ON
 */
static const struct dev_pm_ops sep_pm = {
        .runtime_resume = sep_pm_runtime_resume,
        .runtime_suspend = sep_pm_runtime_suspend,
        .resume = sep_pci_resume,
        .suspend = sep_pci_suspend,
};
#endif /* SEP_ENABLE_RUNTIME_PM */

/**
 * sep_pci_driver - registers this device with pci subsystem
 * @name:       name identifier for this driver
 * @sep_pci_id_tbl:     pointer to struct pci_device_id table
 * @sep_probe:  pointer to probe function in PCI driver
 * @sep_remove: pointer to remove function in PCI driver
 */
static struct pci_driver sep_pci_driver = {
#ifdef SEP_ENABLE_RUNTIME_PM
        .driver = {
                .pm = &sep_pm,
        },
#endif
        .name = "sep_sec_driver",
        .id_table = sep_pci_id_tbl,
        .probe = sep_probe,
        .remove = sep_remove
};

module_pci_driver(sep_pci_driver);
MODULE_LICENSE("GPL");