ASoC: cs42xx8: fix the noise in the right dac channel with mono playback

[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / exynos / exynos_drm_ipp.c

/*
 * Copyright (C) 2012 Samsung Electronics Co.Ltd
 * Authors:
 *      Eunchul Kim <chulspro.kim@samsung.com>
 *      Jinyoung Jeon <jy0.jeon@samsung.com>
 *      Sangmin Lee <lsmin.lee@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/clk.h>
#include <linux/pm_runtime.h>

#include <drm/drmP.h>
#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_ipp.h"
#include "exynos_drm_iommu.h"

/*
 * IPP stands for Image Post Processing and
 * supports image scaler/rotator and input/output DMA operations.
 * using FIMC, GSC, Rotator, so on.
 * IPP is integration device driver of same attribute h/w
 */

/*
 * TODO
 * 1. expand command control id.
 * 2. integrate property and config.
 * 3. removed send_event id check routine.
 * 4. compare send_event id if needed.
 * 5. free subdrv_remove notifier callback list if needed.
 * 6. need to check subdrv_open about multi-open.
 * 7. need to power_on implement power and sysmmu ctrl.
 */

#define get_ipp_context(dev)    platform_get_drvdata(to_platform_device(dev))
#define ipp_is_m2m_cmd(c)       (c == IPP_CMD_M2M)

/*
 * A structure of event.
 *
 * @base: base of event.
 * @event: ipp event.
 */
struct drm_exynos_ipp_send_event {
        struct drm_pending_event        base;
        struct drm_exynos_ipp_event     event;
};

/*
 * A structure of memory node.
 *
 * @list: list head to memory queue information.
 * @ops_id: id of operations.
 * @prop_id: id of property.
 * @buf_id: id of buffer.
 * @buf_info: gem objects and dma address, size.
 * @filp: a pointer to drm_file.
 */
struct drm_exynos_ipp_mem_node {
        struct list_head        list;
        enum drm_exynos_ops_id  ops_id;
        u32     prop_id;
        u32     buf_id;
        struct drm_exynos_ipp_buf_info  buf_info;
};

/*
 * A structure of ipp context.
 *
 * @subdrv: prepare initialization using subdrv.
 * @ipp_lock: lock for synchronization of access to ipp_idr.
 * @prop_lock: lock for synchronization of access to prop_idr.
 * @ipp_idr: ipp driver idr.
 * @prop_idr: property idr.
 * @event_workq: event work queue.
 * @cmd_workq: command work queue.
 */
struct ipp_context {
        struct exynos_drm_subdrv        subdrv;
        struct mutex    ipp_lock;
        struct mutex    prop_lock;
        struct idr      ipp_idr;
        struct idr      prop_idr;
        struct workqueue_struct *event_workq;
        struct workqueue_struct *cmd_workq;
};

static LIST_HEAD(exynos_drm_ippdrv_list);
static DEFINE_MUTEX(exynos_drm_ippdrv_lock);
static BLOCKING_NOTIFIER_HEAD(exynos_drm_ippnb_list);

int exynos_drm_ippdrv_register(struct exynos_drm_ippdrv *ippdrv)
{
        mutex_lock(&exynos_drm_ippdrv_lock);
        list_add_tail(&ippdrv->drv_list, &exynos_drm_ippdrv_list);
        mutex_unlock(&exynos_drm_ippdrv_lock);

        return 0;
}

int exynos_drm_ippdrv_unregister(struct exynos_drm_ippdrv *ippdrv)
{
        mutex_lock(&exynos_drm_ippdrv_lock);
        list_del(&ippdrv->drv_list);
        mutex_unlock(&exynos_drm_ippdrv_lock);

        return 0;
}

static int ipp_create_id(struct idr *id_idr, struct mutex *lock, void *obj)
{
        int ret;

        mutex_lock(lock);
        ret = idr_alloc(id_idr, obj, 1, 0, GFP_KERNEL);
        mutex_unlock(lock);

        return ret;
}

static void ipp_remove_id(struct idr *id_idr, struct mutex *lock, u32 id)
{
        mutex_lock(lock);
        idr_remove(id_idr, id);
        mutex_unlock(lock);
}

static void *ipp_find_obj(struct idr *id_idr, struct mutex *lock, u32 id)
{
        void *obj;

        mutex_lock(lock);
        obj = idr_find(id_idr, id);
        mutex_unlock(lock);

        return obj;
}

static int ipp_check_driver(struct exynos_drm_ippdrv *ippdrv,
                            struct drm_exynos_ipp_property *property)
{
        if (ippdrv->dedicated || (!ipp_is_m2m_cmd(property->cmd) &&
                                  !pm_runtime_suspended(ippdrv->dev)))
                return -EBUSY;

        if (ippdrv->check_property &&
            ippdrv->check_property(ippdrv->dev, property))
                return -EINVAL;

        return 0;
}

static struct exynos_drm_ippdrv *ipp_find_driver(struct ipp_context *ctx,
                struct drm_exynos_ipp_property *property)
{
        struct exynos_drm_ippdrv *ippdrv;
        u32 ipp_id = property->ipp_id;
        int ret;

        if (ipp_id) {
                ippdrv = ipp_find_obj(&ctx->ipp_idr, &ctx->ipp_lock, ipp_id);
                if (!ippdrv) {
                        DRM_DEBUG("ipp%d driver not found\n", ipp_id);
                        return ERR_PTR(-ENODEV);
                }

                ret = ipp_check_driver(ippdrv, property);
                if (ret < 0) {
                        DRM_DEBUG("ipp%d driver check error %d\n", ipp_id, ret);
                        return ERR_PTR(ret);
                }

                return ippdrv;
        } else {
                list_for_each_entry(ippdrv, &exynos_drm_ippdrv_list, drv_list) {
                        ret = ipp_check_driver(ippdrv, property);
                        if (ret == 0)
                                return ippdrv;
                }

                DRM_DEBUG("cannot find driver suitable for given property.\n");
        }

        return ERR_PTR(-ENODEV);
}

static struct exynos_drm_ippdrv *ipp_find_drv_by_handle(u32 prop_id)
{
        struct exynos_drm_ippdrv *ippdrv;
        struct drm_exynos_ipp_cmd_node *c_node;
        int count = 0;

        DRM_DEBUG_KMS("prop_id[%d]\n", prop_id);

        /*
         * This case is search ipp driver by prop_id handle.
         * sometimes, ipp subsystem find driver by prop_id.
         * e.g PAUSE state, queue buf, command control.
         */
        list_for_each_entry(ippdrv, &exynos_drm_ippdrv_list, drv_list) {
                DRM_DEBUG_KMS("count[%d]ippdrv[0x%x]\n", count++, (int)ippdrv);

                mutex_lock(&ippdrv->cmd_lock);
                list_for_each_entry(c_node, &ippdrv->cmd_list, list) {
                        if (c_node->property.prop_id == prop_id) {
                                mutex_unlock(&ippdrv->cmd_lock);
                                return ippdrv;
                        }
                }
                mutex_unlock(&ippdrv->cmd_lock);
        }

        return ERR_PTR(-ENODEV);
}

int exynos_drm_ipp_get_property(struct drm_device *drm_dev, void *data,
                struct drm_file *file)
{
        struct drm_exynos_file_private *file_priv = file->driver_priv;
        struct device *dev = file_priv->ipp_dev;
        struct ipp_context *ctx = get_ipp_context(dev);
        struct drm_exynos_ipp_prop_list *prop_list = data;
        struct exynos_drm_ippdrv *ippdrv;
        int count = 0;

        if (!ctx) {
                DRM_ERROR("invalid context.\n");
                return -EINVAL;
        }

        if (!prop_list) {
                DRM_ERROR("invalid property parameter.\n");
                return -EINVAL;
        }

        DRM_DEBUG_KMS("ipp_id[%d]\n", prop_list->ipp_id);

        if (!prop_list->ipp_id) {
                list_for_each_entry(ippdrv, &exynos_drm_ippdrv_list, drv_list)
                        count++;

                /*
                 * Supports ippdrv list count for user application.
                 * First step user application getting ippdrv count.
                 * and second step getting ippdrv capability using ipp_id.
                 */
                prop_list->count = count;
        } else {
                /*
                 * Getting ippdrv capability by ipp_id.
                 * some device not supported wb, output interface.
                 * so, user application detect correct ipp driver
                 * using this ioctl.
                 */
                ippdrv = ipp_find_obj(&ctx->ipp_idr, &ctx->ipp_lock,
                                                prop_list->ipp_id);
                if (!ippdrv) {
                        DRM_ERROR("not found ipp%d driver.\n",
                                        prop_list->ipp_id);
                        return -ENODEV;
                }

                *prop_list = ippdrv->prop_list;
        }

        return 0;
}

static void ipp_print_property(struct drm_exynos_ipp_property *property,
                int idx)
{
        struct drm_exynos_ipp_config *config = &property->config[idx];
        struct drm_exynos_pos *pos = &config->pos;
        struct drm_exynos_sz *sz = &config->sz;

        DRM_DEBUG_KMS("prop_id[%d]ops[%s]fmt[0x%x]\n",
                property->prop_id, idx ? "dst" : "src", config->fmt);

        DRM_DEBUG_KMS("pos[%d %d %d %d]sz[%d %d]f[%d]r[%d]\n",
                pos->x, pos->y, pos->w, pos->h,
                sz->hsize, sz->vsize, config->flip, config->degree);
}

static struct drm_exynos_ipp_cmd_work *ipp_create_cmd_work(void)
{
        struct drm_exynos_ipp_cmd_work *cmd_work;

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

        INIT_WORK((struct work_struct *)cmd_work, ipp_sched_cmd);

        return cmd_work;
}

static struct drm_exynos_ipp_event_work *ipp_create_event_work(void)
{
        struct drm_exynos_ipp_event_work *event_work;

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

        INIT_WORK(&event_work->work, ipp_sched_event);

        return event_work;
}

int exynos_drm_ipp_set_property(struct drm_device *drm_dev, void *data,
                struct drm_file *file)
{
        struct drm_exynos_file_private *file_priv = file->driver_priv;
        struct device *dev = file_priv->ipp_dev;
        struct ipp_context *ctx = get_ipp_context(dev);
        struct drm_exynos_ipp_property *property = data;
        struct exynos_drm_ippdrv *ippdrv;
        struct drm_exynos_ipp_cmd_node *c_node;
        u32 prop_id;
        int ret, i;

        if (!ctx) {
                DRM_ERROR("invalid context.\n");
                return -EINVAL;
        }

        if (!property) {
                DRM_ERROR("invalid property parameter.\n");
                return -EINVAL;
        }

        prop_id = property->prop_id;

        /*
         * This is log print for user application property.
         * user application set various property.
         */
        for_each_ipp_ops(i)
                ipp_print_property(property, i);

        /*
         * In case prop_id is not zero try to set existing property.
         */
        if (prop_id) {
                c_node = ipp_find_obj(&ctx->prop_idr, &ctx->prop_lock, prop_id);

                if (!c_node || c_node->filp != file) {
                        DRM_DEBUG_KMS("prop_id[%d] not found\n", prop_id);
                        return -EINVAL;
                }

                if (c_node->state != IPP_STATE_STOP) {
                        DRM_DEBUG_KMS("prop_id[%d] not stopped\n", prop_id);
                        return -EINVAL;
                }

                c_node->property = *property;

                return 0;
        }

        /* find ipp driver using ipp id */
        ippdrv = ipp_find_driver(ctx, property);
        if (IS_ERR(ippdrv)) {
                DRM_ERROR("failed to get ipp driver.\n");
                return -EINVAL;
        }

        /* allocate command node */
        c_node = kzalloc(sizeof(*c_node), GFP_KERNEL);
        if (!c_node)
                return -ENOMEM;

        ret = ipp_create_id(&ctx->prop_idr, &ctx->prop_lock, c_node);
        if (ret < 0) {
                DRM_ERROR("failed to create id.\n");
                goto err_clear;
        }
        property->prop_id = ret;

        DRM_DEBUG_KMS("created prop_id[%d]cmd[%d]ippdrv[0x%x]\n",
                property->prop_id, property->cmd, (int)ippdrv);

        /* stored property information and ippdrv in private data */
        c_node->property = *property;
        c_node->state = IPP_STATE_IDLE;
        c_node->filp = file;

        c_node->start_work = ipp_create_cmd_work();
        if (IS_ERR(c_node->start_work)) {
                DRM_ERROR("failed to create start work.\n");
                ret = PTR_ERR(c_node->start_work);
                goto err_remove_id;
        }

        c_node->stop_work = ipp_create_cmd_work();
        if (IS_ERR(c_node->stop_work)) {
                DRM_ERROR("failed to create stop work.\n");
                ret = PTR_ERR(c_node->stop_work);
                goto err_free_start;
        }

        c_node->event_work = ipp_create_event_work();
        if (IS_ERR(c_node->event_work)) {
                DRM_ERROR("failed to create event work.\n");
                ret = PTR_ERR(c_node->event_work);
                goto err_free_stop;
        }

        mutex_init(&c_node->lock);
        mutex_init(&c_node->mem_lock);
        mutex_init(&c_node->event_lock);

        init_completion(&c_node->start_complete);
        init_completion(&c_node->stop_complete);

        for_each_ipp_ops(i)
                INIT_LIST_HEAD(&c_node->mem_list[i]);

        INIT_LIST_HEAD(&c_node->event_list);
        mutex_lock(&ippdrv->cmd_lock);
        list_add_tail(&c_node->list, &ippdrv->cmd_list);
        mutex_unlock(&ippdrv->cmd_lock);

        /* make dedicated state without m2m */
        if (!ipp_is_m2m_cmd(property->cmd))
                ippdrv->dedicated = true;

        return 0;

err_free_stop:
        kfree(c_node->stop_work);
err_free_start:
        kfree(c_node->start_work);
err_remove_id:
        ipp_remove_id(&ctx->prop_idr, &ctx->prop_lock, property->prop_id);
err_clear:
        kfree(c_node);
        return ret;
}

static int ipp_validate_mem_node(struct drm_device *drm_dev,
                                 struct drm_exynos_ipp_mem_node *m_node,
                                 struct drm_exynos_ipp_cmd_node *c_node)
{
        struct drm_exynos_ipp_config *ipp_cfg;
        unsigned int num_plane;
        unsigned long size, buf_size = 0, plane_size, img_size = 0;
        unsigned int bpp, width, height;
        int i;

        ipp_cfg = &c_node->property.config[m_node->ops_id];
        num_plane = drm_format_num_planes(ipp_cfg->fmt);

        /**
         * This is a rather simplified validation of a memory node.
         * It basically verifies provided gem object handles
         * and the buffer sizes with respect to current configuration.
         * This is not the best that can be done
         * but it seems more than enough
         */
        for (i = 0; i < num_plane; ++i) {
                width = ipp_cfg->sz.hsize;
                height = ipp_cfg->sz.vsize;
                bpp = drm_format_plane_cpp(ipp_cfg->fmt, i);

                /*
                 * The result of drm_format_plane_cpp() for chroma planes must
                 * be used with drm_format_xxxx_chroma_subsampling() for
                 * correct result.
                 */
                if (i > 0) {
                        width /= drm_format_horz_chroma_subsampling(
                                                                ipp_cfg->fmt);
                        height /= drm_format_vert_chroma_subsampling(
                                                                ipp_cfg->fmt);
                }
                plane_size = width * height * bpp;
                img_size += plane_size;

                if (m_node->buf_info.handles[i]) {
                        size = exynos_drm_gem_get_size(drm_dev,
                                        m_node->buf_info.handles[i],
                                        c_node->filp);
                        if (plane_size > size) {
                                DRM_ERROR(
                                        "buffer %d is smaller than required\n",
                                        i);
                                return -EINVAL;
                        }

                        buf_size += size;
                }
        }

        if (buf_size < img_size) {
                DRM_ERROR("size of buffers(%lu) is smaller than image(%lu)\n",
                        buf_size, img_size);
                return -EINVAL;
        }

        return 0;
}

static int ipp_put_mem_node(struct drm_device *drm_dev,
                struct drm_exynos_ipp_cmd_node *c_node,
                struct drm_exynos_ipp_mem_node *m_node)
{
        int i;

        DRM_DEBUG_KMS("node[0x%x]\n", (int)m_node);

        if (!m_node) {
                DRM_ERROR("invalid dequeue node.\n");
                return -EFAULT;
        }

        DRM_DEBUG_KMS("ops_id[%d]\n", m_node->ops_id);

        /* put gem buffer */
        for_each_ipp_planar(i) {
                unsigned long handle = m_node->buf_info.handles[i];
                if (handle)
                        exynos_drm_gem_put_dma_addr(drm_dev, handle,
                                                        c_node->filp);
        }

        list_del(&m_node->list);
        kfree(m_node);

        return 0;
}

static struct drm_exynos_ipp_mem_node
                *ipp_get_mem_node(struct drm_device *drm_dev,
                struct drm_exynos_ipp_cmd_node *c_node,
                struct drm_exynos_ipp_queue_buf *qbuf)
{
        struct drm_exynos_ipp_mem_node *m_node;
        struct drm_exynos_ipp_buf_info *buf_info;
        int i;

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

        buf_info = &m_node->buf_info;

        /* operations, buffer id */
        m_node->ops_id = qbuf->ops_id;
        m_node->prop_id = qbuf->prop_id;
        m_node->buf_id = qbuf->buf_id;
        INIT_LIST_HEAD(&m_node->list);

        DRM_DEBUG_KMS("m_node[0x%x]ops_id[%d]\n", (int)m_node, qbuf->ops_id);
        DRM_DEBUG_KMS("prop_id[%d]buf_id[%d]\n", qbuf->prop_id, m_node->buf_id);

        for_each_ipp_planar(i) {
                DRM_DEBUG_KMS("i[%d]handle[0x%x]\n", i, qbuf->handle[i]);

                /* get dma address by handle */
                if (qbuf->handle[i]) {
                        dma_addr_t *addr;

                        addr = exynos_drm_gem_get_dma_addr(drm_dev,
                                        qbuf->handle[i], c_node->filp);
                        if (IS_ERR(addr)) {
                                DRM_ERROR("failed to get addr.\n");
                                ipp_put_mem_node(drm_dev, c_node, m_node);
                                return ERR_PTR(-EFAULT);
                        }

                        buf_info->handles[i] = qbuf->handle[i];
                        buf_info->base[i] = *addr;
                        DRM_DEBUG_KMS("i[%d]base[0x%x]hd[0x%lx]\n", i,
                                      buf_info->base[i], buf_info->handles[i]);
                }
        }

        mutex_lock(&c_node->mem_lock);
        if (ipp_validate_mem_node(drm_dev, m_node, c_node)) {
                ipp_put_mem_node(drm_dev, c_node, m_node);
                mutex_unlock(&c_node->mem_lock);
                return ERR_PTR(-EFAULT);
        }
        list_add_tail(&m_node->list, &c_node->mem_list[qbuf->ops_id]);
        mutex_unlock(&c_node->mem_lock);

        return m_node;
}

static void ipp_clean_mem_nodes(struct drm_device *drm_dev,
                               struct drm_exynos_ipp_cmd_node *c_node, int ops)
{
        struct drm_exynos_ipp_mem_node *m_node, *tm_node;
        struct list_head *head = &c_node->mem_list[ops];

        mutex_lock(&c_node->mem_lock);

        list_for_each_entry_safe(m_node, tm_node, head, list) {
                int ret;

                ret = ipp_put_mem_node(drm_dev, c_node, m_node);
                if (ret)
                        DRM_ERROR("failed to put m_node.\n");
        }

        mutex_unlock(&c_node->mem_lock);
}

static void ipp_free_event(struct drm_pending_event *event)
{
        kfree(event);
}

static int ipp_get_event(struct drm_device *drm_dev,
                struct drm_exynos_ipp_cmd_node *c_node,
                struct drm_exynos_ipp_queue_buf *qbuf)
{
        struct drm_exynos_ipp_send_event *e;
        unsigned long flags;

        DRM_DEBUG_KMS("ops_id[%d]buf_id[%d]\n", qbuf->ops_id, qbuf->buf_id);

        e = kzalloc(sizeof(*e), GFP_KERNEL);
        if (!e) {
                spin_lock_irqsave(&drm_dev->event_lock, flags);
                c_node->filp->event_space += sizeof(e->event);
                spin_unlock_irqrestore(&drm_dev->event_lock, flags);
                return -ENOMEM;
        }

        /* make event */
        e->event.base.type = DRM_EXYNOS_IPP_EVENT;
        e->event.base.length = sizeof(e->event);
        e->event.user_data = qbuf->user_data;
        e->event.prop_id = qbuf->prop_id;
        e->event.buf_id[EXYNOS_DRM_OPS_DST] = qbuf->buf_id;
        e->base.event = &e->event.base;
        e->base.file_priv = c_node->filp;
        e->base.destroy = ipp_free_event;
        mutex_lock(&c_node->event_lock);
        list_add_tail(&e->base.link, &c_node->event_list);
        mutex_unlock(&c_node->event_lock);

        return 0;
}

static void ipp_put_event(struct drm_exynos_ipp_cmd_node *c_node,
                struct drm_exynos_ipp_queue_buf *qbuf)
{
        struct drm_exynos_ipp_send_event *e, *te;
        int count = 0;

        mutex_lock(&c_node->event_lock);
        list_for_each_entry_safe(e, te, &c_node->event_list, base.link) {
                DRM_DEBUG_KMS("count[%d]e[0x%x]\n", count++, (int)e);

                /*
                 * qbuf == NULL condition means all event deletion.
                 * stop operations want to delete all event list.
                 * another case delete only same buf id.
                 */
                if (!qbuf) {
                        /* delete list */
                        list_del(&e->base.link);
                        kfree(e);
                }

                /* compare buffer id */
                if (qbuf && (qbuf->buf_id ==
                    e->event.buf_id[EXYNOS_DRM_OPS_DST])) {
                        /* delete list */
                        list_del(&e->base.link);
                        kfree(e);
                        goto out_unlock;
                }
        }

out_unlock:
        mutex_unlock(&c_node->event_lock);
        return;
}

static void ipp_clean_cmd_node(struct ipp_context *ctx,
                                struct drm_exynos_ipp_cmd_node *c_node)
{
        int i;

        /* cancel works */
        cancel_work_sync(&c_node->start_work->work);
        cancel_work_sync(&c_node->stop_work->work);
        cancel_work_sync(&c_node->event_work->work);

        /* put event */
        ipp_put_event(c_node, NULL);

        for_each_ipp_ops(i)
                ipp_clean_mem_nodes(ctx->subdrv.drm_dev, c_node, i);

        /* delete list */
        list_del(&c_node->list);

        ipp_remove_id(&ctx->prop_idr, &ctx->prop_lock,
                        c_node->property.prop_id);

        /* destroy mutex */
        mutex_destroy(&c_node->lock);
        mutex_destroy(&c_node->mem_lock);
        mutex_destroy(&c_node->event_lock);

        /* free command node */
        kfree(c_node->start_work);
        kfree(c_node->stop_work);
        kfree(c_node->event_work);
        kfree(c_node);
}

static bool ipp_check_mem_list(struct drm_exynos_ipp_cmd_node *c_node)
{
        switch (c_node->property.cmd) {
        case IPP_CMD_WB:
                return !list_empty(&c_node->mem_list[EXYNOS_DRM_OPS_DST]);
        case IPP_CMD_OUTPUT:
                return !list_empty(&c_node->mem_list[EXYNOS_DRM_OPS_SRC]);
        case IPP_CMD_M2M:
        default:
                return !list_empty(&c_node->mem_list[EXYNOS_DRM_OPS_SRC]) &&
                       !list_empty(&c_node->mem_list[EXYNOS_DRM_OPS_DST]);
        }
}

static struct drm_exynos_ipp_mem_node
                *ipp_find_mem_node(struct drm_exynos_ipp_cmd_node *c_node,
                struct drm_exynos_ipp_queue_buf *qbuf)
{
        struct drm_exynos_ipp_mem_node *m_node;
        struct list_head *head;
        int count = 0;

        DRM_DEBUG_KMS("buf_id[%d]\n", qbuf->buf_id);

        /* source/destination memory list */
        head = &c_node->mem_list[qbuf->ops_id];

        /* find memory node from memory list */
        list_for_each_entry(m_node, head, list) {
                DRM_DEBUG_KMS("count[%d]m_node[0x%x]\n", count++, (int)m_node);

                /* compare buffer id */
                if (m_node->buf_id == qbuf->buf_id)
                        return m_node;
        }

        return NULL;
}

static int ipp_set_mem_node(struct exynos_drm_ippdrv *ippdrv,
                struct drm_exynos_ipp_cmd_node *c_node,
                struct drm_exynos_ipp_mem_node *m_node)
{
        struct exynos_drm_ipp_ops *ops = NULL;
        int ret = 0;

        DRM_DEBUG_KMS("node[0x%x]\n", (int)m_node);

        if (!m_node) {
                DRM_ERROR("invalid queue node.\n");
                return -EFAULT;
        }

        DRM_DEBUG_KMS("ops_id[%d]\n", m_node->ops_id);

        /* get operations callback */
        ops = ippdrv->ops[m_node->ops_id];
        if (!ops) {
                DRM_ERROR("not support ops.\n");
                return -EFAULT;
        }

        /* set address and enable irq */
        if (ops->set_addr) {
                ret = ops->set_addr(ippdrv->dev, &m_node->buf_info,
                        m_node->buf_id, IPP_BUF_ENQUEUE);
                if (ret) {
                        DRM_ERROR("failed to set addr.\n");
                        return ret;
                }
        }

        return ret;
}

static void ipp_handle_cmd_work(struct device *dev,
                struct exynos_drm_ippdrv *ippdrv,
                struct drm_exynos_ipp_cmd_work *cmd_work,
                struct drm_exynos_ipp_cmd_node *c_node)
{
        struct ipp_context *ctx = get_ipp_context(dev);

        cmd_work->ippdrv = ippdrv;
        cmd_work->c_node = c_node;
        queue_work(ctx->cmd_workq, &cmd_work->work);
}

static int ipp_queue_buf_with_run(struct device *dev,
                struct drm_exynos_ipp_cmd_node *c_node,
                struct drm_exynos_ipp_mem_node *m_node,
                struct drm_exynos_ipp_queue_buf *qbuf)
{
        struct exynos_drm_ippdrv *ippdrv;
        struct drm_exynos_ipp_property *property;
        struct exynos_drm_ipp_ops *ops;
        int ret;

        ippdrv = ipp_find_drv_by_handle(qbuf->prop_id);
        if (IS_ERR(ippdrv)) {
                DRM_ERROR("failed to get ipp driver.\n");
                return -EFAULT;
        }

        ops = ippdrv->ops[qbuf->ops_id];
        if (!ops) {
                DRM_ERROR("failed to get ops.\n");
                return -EFAULT;
        }

        property = &c_node->property;

        if (c_node->state != IPP_STATE_START) {
                DRM_DEBUG_KMS("bypass for invalid state.\n");
                return 0;
        }

        mutex_lock(&c_node->mem_lock);
        if (!ipp_check_mem_list(c_node)) {
                mutex_unlock(&c_node->mem_lock);
                DRM_DEBUG_KMS("empty memory.\n");
                return 0;
        }

        /*
         * If set destination buffer and enabled clock,
         * then m2m operations need start operations at queue_buf
         */
        if (ipp_is_m2m_cmd(property->cmd)) {
                struct drm_exynos_ipp_cmd_work *cmd_work = c_node->start_work;

                cmd_work->ctrl = IPP_CTRL_PLAY;
                ipp_handle_cmd_work(dev, ippdrv, cmd_work, c_node);
        } else {
                ret = ipp_set_mem_node(ippdrv, c_node, m_node);
                if (ret) {
                        mutex_unlock(&c_node->mem_lock);
                        DRM_ERROR("failed to set m node.\n");
                        return ret;
                }
        }
        mutex_unlock(&c_node->mem_lock);

        return 0;
}

static void ipp_clean_queue_buf(struct drm_device *drm_dev,
                struct drm_exynos_ipp_cmd_node *c_node,
                struct drm_exynos_ipp_queue_buf *qbuf)
{
        struct drm_exynos_ipp_mem_node *m_node, *tm_node;

        /* delete list */
        mutex_lock(&c_node->mem_lock);
        list_for_each_entry_safe(m_node, tm_node,
                &c_node->mem_list[qbuf->ops_id], list) {
                if (m_node->buf_id == qbuf->buf_id &&
                    m_node->ops_id == qbuf->ops_id)
                        ipp_put_mem_node(drm_dev, c_node, m_node);
        }
        mutex_unlock(&c_node->mem_lock);
}

int exynos_drm_ipp_queue_buf(struct drm_device *drm_dev, void *data,
                struct drm_file *file)
{
        struct drm_exynos_file_private *file_priv = file->driver_priv;
        struct device *dev = file_priv->ipp_dev;
        struct ipp_context *ctx = get_ipp_context(dev);
        struct drm_exynos_ipp_queue_buf *qbuf = data;
        struct drm_exynos_ipp_cmd_node *c_node;
        struct drm_exynos_ipp_mem_node *m_node;
        int ret;

        if (!qbuf) {
                DRM_ERROR("invalid buf parameter.\n");
                return -EINVAL;
        }

        if (qbuf->ops_id >= EXYNOS_DRM_OPS_MAX) {
                DRM_ERROR("invalid ops parameter.\n");
                return -EINVAL;
        }

        DRM_DEBUG_KMS("prop_id[%d]ops_id[%s]buf_id[%d]buf_type[%d]\n",
                qbuf->prop_id, qbuf->ops_id ? "dst" : "src",
                qbuf->buf_id, qbuf->buf_type);

        /* find command node */
        c_node = ipp_find_obj(&ctx->prop_idr, &ctx->prop_lock,
                qbuf->prop_id);
        if (!c_node || c_node->filp != file) {
                DRM_ERROR("failed to get command node.\n");
                return -ENODEV;
        }

        /* buffer control */
        switch (qbuf->buf_type) {
        case IPP_BUF_ENQUEUE:
                /* get memory node */
                m_node = ipp_get_mem_node(drm_dev, c_node, qbuf);
                if (IS_ERR(m_node)) {
                        DRM_ERROR("failed to get m_node.\n");
                        return PTR_ERR(m_node);
                }

                /*
                 * first step get event for destination buffer.
                 * and second step when M2M case run with destination buffer
                 * if needed.
                 */
                if (qbuf->ops_id == EXYNOS_DRM_OPS_DST) {
                        /* get event for destination buffer */
                        ret = ipp_get_event(drm_dev, c_node, qbuf);
                        if (ret) {
                                DRM_ERROR("failed to get event.\n");
                                goto err_clean_node;
                        }

                        /*
                         * M2M case run play control for streaming feature.
                         * other case set address and waiting.
                         */
                        ret = ipp_queue_buf_with_run(dev, c_node, m_node, qbuf);
                        if (ret) {
                                DRM_ERROR("failed to run command.\n");
                                goto err_clean_node;
                        }
                }
                break;
        case IPP_BUF_DEQUEUE:
                mutex_lock(&c_node->lock);

                /* put event for destination buffer */
                if (qbuf->ops_id == EXYNOS_DRM_OPS_DST)
                        ipp_put_event(c_node, qbuf);

                ipp_clean_queue_buf(drm_dev, c_node, qbuf);

                mutex_unlock(&c_node->lock);
                break;
        default:
                DRM_ERROR("invalid buffer control.\n");
                return -EINVAL;
        }

        return 0;

err_clean_node:
        DRM_ERROR("clean memory nodes.\n");

        ipp_clean_queue_buf(drm_dev, c_node, qbuf);
        return ret;
}

static bool exynos_drm_ipp_check_valid(struct device *dev,
                enum drm_exynos_ipp_ctrl ctrl, enum drm_exynos_ipp_state state)
{
        if (ctrl != IPP_CTRL_PLAY) {
                if (pm_runtime_suspended(dev)) {
                        DRM_ERROR("pm:runtime_suspended.\n");
                        goto err_status;
                }
        }

        switch (ctrl) {
        case IPP_CTRL_PLAY:
                if (state != IPP_STATE_IDLE)
                        goto err_status;
                break;
        case IPP_CTRL_STOP:
                if (state == IPP_STATE_STOP)
                        goto err_status;
                break;
        case IPP_CTRL_PAUSE:
                if (state != IPP_STATE_START)
                        goto err_status;
                break;
        case IPP_CTRL_RESUME:
                if (state != IPP_STATE_STOP)
                        goto err_status;
                break;
        default:
                DRM_ERROR("invalid state.\n");
                goto err_status;
        }

        return true;

err_status:
        DRM_ERROR("invalid status:ctrl[%d]state[%d]\n", ctrl, state);
        return false;
}

int exynos_drm_ipp_cmd_ctrl(struct drm_device *drm_dev, void *data,
                struct drm_file *file)
{
        struct drm_exynos_file_private *file_priv = file->driver_priv;
        struct exynos_drm_ippdrv *ippdrv = NULL;
        struct device *dev = file_priv->ipp_dev;
        struct ipp_context *ctx = get_ipp_context(dev);
        struct drm_exynos_ipp_cmd_ctrl *cmd_ctrl = data;
        struct drm_exynos_ipp_cmd_work *cmd_work;
        struct drm_exynos_ipp_cmd_node *c_node;

        if (!ctx) {
                DRM_ERROR("invalid context.\n");
                return -EINVAL;
        }

        if (!cmd_ctrl) {
                DRM_ERROR("invalid control parameter.\n");
                return -EINVAL;
        }

        DRM_DEBUG_KMS("ctrl[%d]prop_id[%d]\n",
                cmd_ctrl->ctrl, cmd_ctrl->prop_id);

        ippdrv = ipp_find_drv_by_handle(cmd_ctrl->prop_id);
        if (IS_ERR(ippdrv)) {
                DRM_ERROR("failed to get ipp driver.\n");
                return PTR_ERR(ippdrv);
        }

        c_node = ipp_find_obj(&ctx->prop_idr, &ctx->prop_lock,
                cmd_ctrl->prop_id);
        if (!c_node || c_node->filp != file) {
                DRM_ERROR("invalid command node list.\n");
                return -ENODEV;
        }

        if (!exynos_drm_ipp_check_valid(ippdrv->dev, cmd_ctrl->ctrl,
            c_node->state)) {
                DRM_ERROR("invalid state.\n");
                return -EINVAL;
        }

        switch (cmd_ctrl->ctrl) {
        case IPP_CTRL_PLAY:
                if (pm_runtime_suspended(ippdrv->dev))
                        pm_runtime_get_sync(ippdrv->dev);

                c_node->state = IPP_STATE_START;

                cmd_work = c_node->start_work;
                cmd_work->ctrl = cmd_ctrl->ctrl;
                ipp_handle_cmd_work(dev, ippdrv, cmd_work, c_node);
                break;
        case IPP_CTRL_STOP:
                cmd_work = c_node->stop_work;
                cmd_work->ctrl = cmd_ctrl->ctrl;
                ipp_handle_cmd_work(dev, ippdrv, cmd_work, c_node);

                if (!wait_for_completion_timeout(&c_node->stop_complete,
                    msecs_to_jiffies(300))) {
                        DRM_ERROR("timeout stop:prop_id[%d]\n",
                                c_node->property.prop_id);
                }

                c_node->state = IPP_STATE_STOP;
                ippdrv->dedicated = false;
                mutex_lock(&ippdrv->cmd_lock);
                ipp_clean_cmd_node(ctx, c_node);

                if (list_empty(&ippdrv->cmd_list))
                        pm_runtime_put_sync(ippdrv->dev);
                mutex_unlock(&ippdrv->cmd_lock);
                break;
        case IPP_CTRL_PAUSE:
                cmd_work = c_node->stop_work;
                cmd_work->ctrl = cmd_ctrl->ctrl;
                ipp_handle_cmd_work(dev, ippdrv, cmd_work, c_node);

                if (!wait_for_completion_timeout(&c_node->stop_complete,
                    msecs_to_jiffies(200))) {
                        DRM_ERROR("timeout stop:prop_id[%d]\n",
                                c_node->property.prop_id);
                }

                c_node->state = IPP_STATE_STOP;
                break;
        case IPP_CTRL_RESUME:
                c_node->state = IPP_STATE_START;
                cmd_work = c_node->start_work;
                cmd_work->ctrl = cmd_ctrl->ctrl;
                ipp_handle_cmd_work(dev, ippdrv, cmd_work, c_node);
                break;
        default:
                DRM_ERROR("could not support this state currently.\n");
                return -EINVAL;
        }

        DRM_DEBUG_KMS("done ctrl[%d]prop_id[%d]\n",
                cmd_ctrl->ctrl, cmd_ctrl->prop_id);

        return 0;
}

int exynos_drm_ippnb_register(struct notifier_block *nb)
{
        return blocking_notifier_chain_register(
                &exynos_drm_ippnb_list, nb);
}

int exynos_drm_ippnb_unregister(struct notifier_block *nb)
{
        return blocking_notifier_chain_unregister(
                &exynos_drm_ippnb_list, nb);
}

int exynos_drm_ippnb_send_event(unsigned long val, void *v)
{
        return blocking_notifier_call_chain(
                &exynos_drm_ippnb_list, val, v);
}

static int ipp_set_property(struct exynos_drm_ippdrv *ippdrv,
                struct drm_exynos_ipp_property *property)
{
        struct exynos_drm_ipp_ops *ops = NULL;
        bool swap = false;
        int ret, i;

        if (!property) {
                DRM_ERROR("invalid property parameter.\n");
                return -EINVAL;
        }

        DRM_DEBUG_KMS("prop_id[%d]\n", property->prop_id);

        /* reset h/w block */
        if (ippdrv->reset &&
            ippdrv->reset(ippdrv->dev)) {
                return -EINVAL;
        }

        /* set source,destination operations */
        for_each_ipp_ops(i) {
                struct drm_exynos_ipp_config *config =
                        &property->config[i];

                ops = ippdrv->ops[i];
                if (!ops || !config) {
                        DRM_ERROR("not support ops and config.\n");
                        return -EINVAL;
                }

                /* set format */
                if (ops->set_fmt) {
                        ret = ops->set_fmt(ippdrv->dev, config->fmt);
                        if (ret)
                                return ret;
                }

                /* set transform for rotation, flip */
                if (ops->set_transf) {
                        ret = ops->set_transf(ippdrv->dev, config->degree,
                                config->flip, &swap);
                        if (ret)
                                return ret;
                }

                /* set size */
                if (ops->set_size) {
                        ret = ops->set_size(ippdrv->dev, swap, &config->pos,
                                &config->sz);
                        if (ret)
                                return ret;
                }
        }

        return 0;
}

static int ipp_start_property(struct exynos_drm_ippdrv *ippdrv,
                struct drm_exynos_ipp_cmd_node *c_node)
{
        struct drm_exynos_ipp_mem_node *m_node;
        struct drm_exynos_ipp_property *property = &c_node->property;
        struct list_head *head;
        int ret, i;

        DRM_DEBUG_KMS("prop_id[%d]\n", property->prop_id);

        /* store command info in ippdrv */
        ippdrv->c_node = c_node;

        mutex_lock(&c_node->mem_lock);
        if (!ipp_check_mem_list(c_node)) {
                DRM_DEBUG_KMS("empty memory.\n");
                ret = -ENOMEM;
                goto err_unlock;
        }

        /* set current property in ippdrv */
        ret = ipp_set_property(ippdrv, property);
        if (ret) {
                DRM_ERROR("failed to set property.\n");
                ippdrv->c_node = NULL;
                goto err_unlock;
        }

        /* check command */
        switch (property->cmd) {
        case IPP_CMD_M2M:
                for_each_ipp_ops(i) {
                        /* source/destination memory list */
                        head = &c_node->mem_list[i];

                        m_node = list_first_entry(head,
                                struct drm_exynos_ipp_mem_node, list);

                        DRM_DEBUG_KMS("m_node[0x%x]\n", (int)m_node);

                        ret = ipp_set_mem_node(ippdrv, c_node, m_node);
                        if (ret) {
                                DRM_ERROR("failed to set m node.\n");
                                goto err_unlock;
                        }
                }
                break;
        case IPP_CMD_WB:
                /* destination memory list */
                head = &c_node->mem_list[EXYNOS_DRM_OPS_DST];

                list_for_each_entry(m_node, head, list) {
                        ret = ipp_set_mem_node(ippdrv, c_node, m_node);
                        if (ret) {
                                DRM_ERROR("failed to set m node.\n");
                                goto err_unlock;
                        }
                }
                break;
        case IPP_CMD_OUTPUT:
                /* source memory list */
                head = &c_node->mem_list[EXYNOS_DRM_OPS_SRC];

                list_for_each_entry(m_node, head, list) {
                        ret = ipp_set_mem_node(ippdrv, c_node, m_node);
                        if (ret) {
                                DRM_ERROR("failed to set m node.\n");
                                goto err_unlock;
                        }
                }
                break;
        default:
                DRM_ERROR("invalid operations.\n");
                ret = -EINVAL;
                goto err_unlock;
        }
        mutex_unlock(&c_node->mem_lock);

        DRM_DEBUG_KMS("cmd[%d]\n", property->cmd);

        /* start operations */
        if (ippdrv->start) {
                ret = ippdrv->start(ippdrv->dev, property->cmd);
                if (ret) {
                        DRM_ERROR("failed to start ops.\n");
                        ippdrv->c_node = NULL;
                        return ret;
                }
        }

        return 0;

err_unlock:
        mutex_unlock(&c_node->mem_lock);
        ippdrv->c_node = NULL;
        return ret;
}

static int ipp_stop_property(struct drm_device *drm_dev,
                struct exynos_drm_ippdrv *ippdrv,
                struct drm_exynos_ipp_cmd_node *c_node)
{
        struct drm_exynos_ipp_property *property = &c_node->property;
        int i;

        DRM_DEBUG_KMS("prop_id[%d]\n", property->prop_id);

        /* stop operations */
        if (ippdrv->stop)
                ippdrv->stop(ippdrv->dev, property->cmd);

        /* check command */
        switch (property->cmd) {
        case IPP_CMD_M2M:
                for_each_ipp_ops(i)
                        ipp_clean_mem_nodes(drm_dev, c_node, i);
                break;
        case IPP_CMD_WB:
                ipp_clean_mem_nodes(drm_dev, c_node, EXYNOS_DRM_OPS_DST);
                break;
        case IPP_CMD_OUTPUT:
                ipp_clean_mem_nodes(drm_dev, c_node, EXYNOS_DRM_OPS_SRC);
                break;
        default:
                DRM_ERROR("invalid operations.\n");
                return -EINVAL;
        }

        return 0;
}

void ipp_sched_cmd(struct work_struct *work)
{
        struct drm_exynos_ipp_cmd_work *cmd_work =
                container_of(work, struct drm_exynos_ipp_cmd_work, work);
        struct exynos_drm_ippdrv *ippdrv;
        struct drm_exynos_ipp_cmd_node *c_node;
        struct drm_exynos_ipp_property *property;
        int ret;

        ippdrv = cmd_work->ippdrv;
        if (!ippdrv) {
                DRM_ERROR("invalid ippdrv list.\n");
                return;
        }

        c_node = cmd_work->c_node;
        if (!c_node) {
                DRM_ERROR("invalid command node list.\n");
                return;
        }

        mutex_lock(&c_node->lock);

        property = &c_node->property;

        switch (cmd_work->ctrl) {
        case IPP_CTRL_PLAY:
        case IPP_CTRL_RESUME:
                ret = ipp_start_property(ippdrv, c_node);
                if (ret) {
                        DRM_ERROR("failed to start property:prop_id[%d]\n",
                                c_node->property.prop_id);
                        goto err_unlock;
                }

                /*
                 * M2M case supports wait_completion of transfer.
                 * because M2M case supports single unit operation
                 * with multiple queue.
                 * M2M need to wait completion of data transfer.
                 */
                if (ipp_is_m2m_cmd(property->cmd)) {
                        if (!wait_for_completion_timeout
                            (&c_node->start_complete, msecs_to_jiffies(200))) {
                                DRM_ERROR("timeout event:prop_id[%d]\n",
                                        c_node->property.prop_id);
                                goto err_unlock;
                        }
                }
                break;
        case IPP_CTRL_STOP:
        case IPP_CTRL_PAUSE:
                ret = ipp_stop_property(ippdrv->drm_dev, ippdrv,
                        c_node);
                if (ret) {
                        DRM_ERROR("failed to stop property.\n");
                        goto err_unlock;
                }

                complete(&c_node->stop_complete);
                break;
        default:
                DRM_ERROR("unknown control type\n");
                break;
        }

        DRM_DEBUG_KMS("ctrl[%d] done.\n", cmd_work->ctrl);

err_unlock:
        mutex_unlock(&c_node->lock);
}

static int ipp_send_event(struct exynos_drm_ippdrv *ippdrv,
                struct drm_exynos_ipp_cmd_node *c_node, int *buf_id)
{
        struct drm_device *drm_dev = ippdrv->drm_dev;
        struct drm_exynos_ipp_property *property = &c_node->property;
        struct drm_exynos_ipp_mem_node *m_node;
        struct drm_exynos_ipp_queue_buf qbuf;
        struct drm_exynos_ipp_send_event *e;
        struct list_head *head;
        struct timeval now;
        unsigned long flags;
        u32 tbuf_id[EXYNOS_DRM_OPS_MAX] = {0, };
        int ret, i;

        for_each_ipp_ops(i)
                DRM_DEBUG_KMS("%s buf_id[%d]\n", i ? "dst" : "src", buf_id[i]);

        if (!drm_dev) {
                DRM_ERROR("failed to get drm_dev.\n");
                return -EINVAL;
        }

        if (!property) {
                DRM_ERROR("failed to get property.\n");
                return -EINVAL;
        }

        mutex_lock(&c_node->event_lock);
        if (list_empty(&c_node->event_list)) {
                DRM_DEBUG_KMS("event list is empty.\n");
                ret = 0;
                goto err_event_unlock;
        }

        mutex_lock(&c_node->mem_lock);
        if (!ipp_check_mem_list(c_node)) {
                DRM_DEBUG_KMS("empty memory.\n");
                ret = 0;
                goto err_mem_unlock;
        }

        /* check command */
        switch (property->cmd) {
        case IPP_CMD_M2M:
                for_each_ipp_ops(i) {
                        /* source/destination memory list */
                        head = &c_node->mem_list[i];

                        m_node = list_first_entry(head,
                                struct drm_exynos_ipp_mem_node, list);

                        tbuf_id[i] = m_node->buf_id;
                        DRM_DEBUG_KMS("%s buf_id[%d]\n",
                                i ? "dst" : "src", tbuf_id[i]);

                        ret = ipp_put_mem_node(drm_dev, c_node, m_node);
                        if (ret)
                                DRM_ERROR("failed to put m_node.\n");
                }
                break;
        case IPP_CMD_WB:
                /* clear buf for finding */
                memset(&qbuf, 0x0, sizeof(qbuf));
                qbuf.ops_id = EXYNOS_DRM_OPS_DST;
                qbuf.buf_id = buf_id[EXYNOS_DRM_OPS_DST];

                /* get memory node entry */
                m_node = ipp_find_mem_node(c_node, &qbuf);
                if (!m_node) {
                        DRM_ERROR("empty memory node.\n");
                        ret = -ENOMEM;
                        goto err_mem_unlock;
                }

                tbuf_id[EXYNOS_DRM_OPS_DST] = m_node->buf_id;

                ret = ipp_put_mem_node(drm_dev, c_node, m_node);
                if (ret)
                        DRM_ERROR("failed to put m_node.\n");
                break;
        case IPP_CMD_OUTPUT:
                /* source memory list */
                head = &c_node->mem_list[EXYNOS_DRM_OPS_SRC];

                m_node = list_first_entry(head,
                        struct drm_exynos_ipp_mem_node, list);

                tbuf_id[EXYNOS_DRM_OPS_SRC] = m_node->buf_id;

                ret = ipp_put_mem_node(drm_dev, c_node, m_node);
                if (ret)
                        DRM_ERROR("failed to put m_node.\n");
                break;
        default:
                DRM_ERROR("invalid operations.\n");
                ret = -EINVAL;
                goto err_mem_unlock;
        }
        mutex_unlock(&c_node->mem_lock);

        if (tbuf_id[EXYNOS_DRM_OPS_DST] != buf_id[EXYNOS_DRM_OPS_DST])
                DRM_ERROR("failed to match buf_id[%d %d]prop_id[%d]\n",
                        tbuf_id[1], buf_id[1], property->prop_id);

        /*
         * command node have event list of destination buffer
         * If destination buffer enqueue to mem list,
         * then we make event and link to event list tail.
         * so, we get first event for first enqueued buffer.
         */
        e = list_first_entry(&c_node->event_list,
                struct drm_exynos_ipp_send_event, base.link);

        do_gettimeofday(&now);
        DRM_DEBUG_KMS("tv_sec[%ld]tv_usec[%ld]\n", now.tv_sec, now.tv_usec);
        e->event.tv_sec = now.tv_sec;
        e->event.tv_usec = now.tv_usec;
        e->event.prop_id = property->prop_id;

        /* set buffer id about source destination */
        for_each_ipp_ops(i)
                e->event.buf_id[i] = tbuf_id[i];

        spin_lock_irqsave(&drm_dev->event_lock, flags);
        list_move_tail(&e->base.link, &e->base.file_priv->event_list);
        wake_up_interruptible(&e->base.file_priv->event_wait);
        spin_unlock_irqrestore(&drm_dev->event_lock, flags);
        mutex_unlock(&c_node->event_lock);

        DRM_DEBUG_KMS("done cmd[%d]prop_id[%d]buf_id[%d]\n",
                property->cmd, property->prop_id, tbuf_id[EXYNOS_DRM_OPS_DST]);

        return 0;

err_mem_unlock:
        mutex_unlock(&c_node->mem_lock);
err_event_unlock:
        mutex_unlock(&c_node->event_lock);
        return ret;
}

void ipp_sched_event(struct work_struct *work)
{
        struct drm_exynos_ipp_event_work *event_work =
                container_of(work, struct drm_exynos_ipp_event_work, work);
        struct exynos_drm_ippdrv *ippdrv;
        struct drm_exynos_ipp_cmd_node *c_node;
        int ret;

        if (!event_work) {
                DRM_ERROR("failed to get event_work.\n");
                return;
        }

        DRM_DEBUG_KMS("buf_id[%d]\n", event_work->buf_id[EXYNOS_DRM_OPS_DST]);

        ippdrv = event_work->ippdrv;
        if (!ippdrv) {
                DRM_ERROR("failed to get ipp driver.\n");
                return;
        }

        c_node = ippdrv->c_node;
        if (!c_node) {
                DRM_ERROR("failed to get command node.\n");
                return;
        }

        /*
         * IPP supports command thread, event thread synchronization.
         * If IPP close immediately from user land, then IPP make
         * synchronization with command thread, so make complete event.
         * or going out operations.
         */
        if (c_node->state != IPP_STATE_START) {
                DRM_DEBUG_KMS("bypass state[%d]prop_id[%d]\n",
                        c_node->state, c_node->property.prop_id);
                goto err_completion;
        }

        ret = ipp_send_event(ippdrv, c_node, event_work->buf_id);
        if (ret) {
                DRM_ERROR("failed to send event.\n");
                goto err_completion;
        }

err_completion:
        if (ipp_is_m2m_cmd(c_node->property.cmd))
                complete(&c_node->start_complete);
}

static int ipp_subdrv_probe(struct drm_device *drm_dev, struct device *dev)
{
        struct ipp_context *ctx = get_ipp_context(dev);
        struct exynos_drm_ippdrv *ippdrv;
        int ret, count = 0;

        /* get ipp driver entry */
        list_for_each_entry(ippdrv, &exynos_drm_ippdrv_list, drv_list) {
                ippdrv->drm_dev = drm_dev;

                ret = ipp_create_id(&ctx->ipp_idr, &ctx->ipp_lock, ippdrv);
                if (ret < 0) {
                        DRM_ERROR("failed to create id.\n");
                        goto err;
                }
                ippdrv->prop_list.ipp_id = ret;

                DRM_DEBUG_KMS("count[%d]ippdrv[0x%x]ipp_id[%d]\n",
                        count++, (int)ippdrv, ret);

                /* store parent device for node */
                ippdrv->parent_dev = dev;

                /* store event work queue and handler */
                ippdrv->event_workq = ctx->event_workq;
                ippdrv->sched_event = ipp_sched_event;
                INIT_LIST_HEAD(&ippdrv->cmd_list);
                mutex_init(&ippdrv->cmd_lock);

                ret = drm_iommu_attach_device(drm_dev, ippdrv->dev);
                if (ret) {
                        DRM_ERROR("failed to activate iommu\n");
                        goto err;
                }
        }

        return 0;

err:
        /* get ipp driver entry */
        list_for_each_entry_continue_reverse(ippdrv, &exynos_drm_ippdrv_list,
                                                drv_list) {
                drm_iommu_detach_device(drm_dev, ippdrv->dev);

                ipp_remove_id(&ctx->ipp_idr, &ctx->ipp_lock,
                                ippdrv->prop_list.ipp_id);
        }

        return ret;
}

static void ipp_subdrv_remove(struct drm_device *drm_dev, struct device *dev)
{
        struct exynos_drm_ippdrv *ippdrv, *t;
        struct ipp_context *ctx = get_ipp_context(dev);

        /* get ipp driver entry */
        list_for_each_entry_safe(ippdrv, t, &exynos_drm_ippdrv_list, drv_list) {
                drm_iommu_detach_device(drm_dev, ippdrv->dev);

                ipp_remove_id(&ctx->ipp_idr, &ctx->ipp_lock,
                                ippdrv->prop_list.ipp_id);

                ippdrv->drm_dev = NULL;
                exynos_drm_ippdrv_unregister(ippdrv);
        }
}

static int ipp_subdrv_open(struct drm_device *drm_dev, struct device *dev,
                struct drm_file *file)
{
        struct drm_exynos_file_private *file_priv = file->driver_priv;

        file_priv->ipp_dev = dev;

        DRM_DEBUG_KMS("done priv[0x%x]\n", (int)dev);

        return 0;
}

static void ipp_subdrv_close(struct drm_device *drm_dev, struct device *dev,
                struct drm_file *file)
{
        struct exynos_drm_ippdrv *ippdrv = NULL;
        struct ipp_context *ctx = get_ipp_context(dev);
        struct drm_exynos_ipp_cmd_node *c_node, *tc_node;
        int count = 0;

        list_for_each_entry(ippdrv, &exynos_drm_ippdrv_list, drv_list) {
                mutex_lock(&ippdrv->cmd_lock);
                list_for_each_entry_safe(c_node, tc_node,
                        &ippdrv->cmd_list, list) {
                        DRM_DEBUG_KMS("count[%d]ippdrv[0x%x]\n",
                                count++, (int)ippdrv);

                        if (c_node->filp == file) {
                                /*
                                 * userland goto unnormal state. process killed.
                                 * and close the file.
                                 * so, IPP didn't called stop cmd ctrl.
                                 * so, we are make stop operation in this state.
                                 */
                                if (c_node->state == IPP_STATE_START) {
                                        ipp_stop_property(drm_dev, ippdrv,
                                                c_node);
                                        c_node->state = IPP_STATE_STOP;
                                }

                                ippdrv->dedicated = false;
                                ipp_clean_cmd_node(ctx, c_node);
                                if (list_empty(&ippdrv->cmd_list))
                                        pm_runtime_put_sync(ippdrv->dev);
                        }
                }
                mutex_unlock(&ippdrv->cmd_lock);
        }

        return;
}

static int ipp_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct ipp_context *ctx;
        struct exynos_drm_subdrv *subdrv;
        int ret;

        ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
        if (!ctx)
                return -ENOMEM;

        mutex_init(&ctx->ipp_lock);
        mutex_init(&ctx->prop_lock);

        idr_init(&ctx->ipp_idr);
        idr_init(&ctx->prop_idr);

        /*
         * create single thread for ipp event
         * IPP supports event thread for IPP drivers.
         * IPP driver send event_work to this thread.
         * and IPP event thread send event to user process.
         */
        ctx->event_workq = create_singlethread_workqueue("ipp_event");
        if (!ctx->event_workq) {
                dev_err(dev, "failed to create event workqueue\n");
                return -EINVAL;
        }

        /*
         * create single thread for ipp command
         * IPP supports command thread for user process.
         * user process make command node using set property ioctl.
         * and make start_work and send this work to command thread.
         * and then this command thread start property.
         */
        ctx->cmd_workq = create_singlethread_workqueue("ipp_cmd");
        if (!ctx->cmd_workq) {
                dev_err(dev, "failed to create cmd workqueue\n");
                ret = -EINVAL;
                goto err_event_workq;
        }

        /* set sub driver informations */
        subdrv = &ctx->subdrv;
        subdrv->dev = dev;
        subdrv->probe = ipp_subdrv_probe;
        subdrv->remove = ipp_subdrv_remove;
        subdrv->open = ipp_subdrv_open;
        subdrv->close = ipp_subdrv_close;

        platform_set_drvdata(pdev, ctx);

        ret = exynos_drm_subdrv_register(subdrv);
        if (ret < 0) {
                DRM_ERROR("failed to register drm ipp device.\n");
                goto err_cmd_workq;
        }

        dev_info(dev, "drm ipp registered successfully.\n");

        return 0;

err_cmd_workq:
        destroy_workqueue(ctx->cmd_workq);
err_event_workq:
        destroy_workqueue(ctx->event_workq);
        return ret;
}

static int ipp_remove(struct platform_device *pdev)
{
        struct ipp_context *ctx = platform_get_drvdata(pdev);

        /* unregister sub driver */
        exynos_drm_subdrv_unregister(&ctx->subdrv);

        /* remove,destroy ipp idr */
        idr_destroy(&ctx->ipp_idr);
        idr_destroy(&ctx->prop_idr);

        mutex_destroy(&ctx->ipp_lock);
        mutex_destroy(&ctx->prop_lock);

        /* destroy command, event work queue */
        destroy_workqueue(ctx->cmd_workq);
        destroy_workqueue(ctx->event_workq);

        return 0;
}

struct platform_driver ipp_driver = {
        .probe          = ipp_probe,
        .remove         = ipp_remove,
        .driver         = {
                .name   = "exynos-drm-ipp",
                .owner  = THIS_MODULE,
        },
};