/**
 * \file drm_stub.h
 * Stub support
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 */

/*
 * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
 *
 * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include <sys/cdefs.h>
#include <dev/drm2/drmP.h>
#include <dev/drm2/drm_core.h>

#ifdef DRM_DEBUG_DEFAULT_ON
unsigned int drm_debug = (DRM_DEBUGBITS_DEBUG | DRM_DEBUGBITS_KMS |
    DRM_DEBUGBITS_FAILED_IOCTL);
#else
unsigned int drm_debug = 0;     /* 1 to enable debug output */
#endif
EXPORT_SYMBOL(drm_debug);

unsigned int drm_notyet = 0;

unsigned int drm_vblank_offdelay = 5000;    /* Default to 5000 msecs. */
EXPORT_SYMBOL(drm_vblank_offdelay);

unsigned int drm_timestamp_precision = 20;  /* Default to 20 usecs. */
EXPORT_SYMBOL(drm_timestamp_precision);

/*
 * Default to use monotonic timestamps for wait-for-vblank and page-flip
 * complete events.
 */
unsigned int drm_timestamp_monotonic = 1;

MODULE_AUTHOR(CORE_AUTHOR);
MODULE_DESCRIPTION(CORE_DESC);
MODULE_LICENSE("GPL and additional rights");
MODULE_PARM_DESC(debug, "Enable debug output");
MODULE_PARM_DESC(vblankoffdelay, "Delay until vblank irq auto-disable [msecs]");
MODULE_PARM_DESC(timestamp_precision_usec, "Max. error on timestamps [usecs]");
MODULE_PARM_DESC(timestamp_monotonic, "Use monotonic timestamps");

module_param_named(debug, drm_debug, int, 0600);
module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);

static struct cdevsw drm_cdevsw = {
        .d_version =    D_VERSION,
        .d_open =       drm_open,
        .d_read =       drm_read,
        .d_ioctl =      drm_ioctl,
        .d_poll =       drm_poll,
        .d_mmap_single = drm_mmap_single,
        .d_name =       "drm",
        .d_flags =      D_TRACKCLOSE
};

static int drm_minor_get_id(struct drm_device *dev, int type)
{
        int new_id;

        new_id = device_get_unit(dev->dev);

        if (new_id >= 64)
                return -EINVAL;

        if (type == DRM_MINOR_CONTROL) {
                new_id += 64;
        } else if (type == DRM_MINOR_RENDER) {
                new_id += 128;
        }

        return new_id;
}

struct drm_master *drm_master_create(struct drm_minor *minor)
{
        struct drm_master *master;

        master = malloc(sizeof(*master), DRM_MEM_KMS, M_NOWAIT | M_ZERO);
        if (!master)
                return NULL;

        refcount_init(&master->refcount, 1);
        mtx_init(&master->lock.spinlock, "drm_master__lock__spinlock",
            NULL, MTX_DEF);
        DRM_INIT_WAITQUEUE(&master->lock.lock_queue);
        drm_ht_create(&master->magiclist, DRM_MAGIC_HASH_ORDER);
        INIT_LIST_HEAD(&master->magicfree);
        master->minor = minor;

        list_add_tail(&master->head, &minor->master_list);

        return master;
}

struct drm_master *drm_master_get(struct drm_master *master)
{
        refcount_acquire(&master->refcount);
        return master;
}
EXPORT_SYMBOL(drm_master_get);

static void drm_master_destroy(struct drm_master *master)
{
        struct drm_magic_entry *pt, *next;
        struct drm_device *dev = master->minor->dev;
        struct drm_map_list *r_list, *list_temp;

        list_del(&master->head);

        if (dev->driver->master_destroy)
                dev->driver->master_destroy(dev, master);

        list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
                if (r_list->master == master) {
                        drm_rmmap_locked(dev, r_list->map);
                        r_list = NULL;
                }
        }

        if (master->unique) {
                free(master->unique, DRM_MEM_DRIVER);
                master->unique = NULL;
                master->unique_len = 0;
        }

        list_for_each_entry_safe(pt, next, &master->magicfree, head) {
                list_del(&pt->head);
                drm_ht_remove_item(&master->magiclist, &pt->hash_item);
                free(pt, DRM_MEM_MAGIC);
        }

        drm_ht_remove(&master->magiclist);

        free(master, DRM_MEM_KMS);
}

void drm_master_put(struct drm_master **master)
{
        if (refcount_release(&(*master)->refcount))
                drm_master_destroy(*master);
        *master = NULL;
}
EXPORT_SYMBOL(drm_master_put);

int drm_setmaster_ioctl(struct drm_device *dev, void *data,
                        struct drm_file *file_priv)
{
        int ret;

        if (file_priv->is_master)
                return 0;

        if (file_priv->minor->master && file_priv->minor->master != file_priv->master)
                return -EINVAL;

        if (!file_priv->master)
                return -EINVAL;

        if (file_priv->minor->master)
                return -EINVAL;

        DRM_LOCK(dev);
        file_priv->minor->master = drm_master_get(file_priv->master);
        file_priv->is_master = 1;
        if (dev->driver->master_set) {
                ret = dev->driver->master_set(dev, file_priv, false);
                if (unlikely(ret != 0)) {
                        file_priv->is_master = 0;
                        drm_master_put(&file_priv->minor->master);
                }
        }
        DRM_UNLOCK(dev);

        return 0;
}

int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
                         struct drm_file *file_priv)
{
        if (!file_priv->is_master)
                return -EINVAL;

        if (!file_priv->minor->master)
                return -EINVAL;

        DRM_LOCK(dev);
        if (dev->driver->master_drop)
                dev->driver->master_drop(dev, file_priv, false);
        drm_master_put(&file_priv->minor->master);
        file_priv->is_master = 0;
        DRM_UNLOCK(dev);
        return 0;
}

int drm_fill_in_dev(struct drm_device *dev,
                           struct drm_driver *driver)
{
        int retcode, i;

        INIT_LIST_HEAD(&dev->filelist);
        INIT_LIST_HEAD(&dev->ctxlist);
        INIT_LIST_HEAD(&dev->maplist);
        INIT_LIST_HEAD(&dev->vblank_event_list);

        mtx_init(&dev->irq_lock, "drmirq", NULL, MTX_DEF);
        mtx_init(&dev->count_lock, "drmcount", NULL, MTX_DEF);
        mtx_init(&dev->event_lock, "drmev", NULL, MTX_DEF);
        sx_init(&dev->dev_struct_lock, "drmslk");
        mtx_init(&dev->ctxlist_mutex, "drmctxlist", NULL, MTX_DEF);
        mtx_init(&dev->pcir_lock, "drmpcir", NULL, MTX_DEF);

        if (drm_ht_create(&dev->map_hash, 12)) {
                return -ENOMEM;
        }

        /* the DRM has 6 basic counters */
        dev->counters = 6;
        dev->types[0] = _DRM_STAT_LOCK;
        dev->types[1] = _DRM_STAT_OPENS;
        dev->types[2] = _DRM_STAT_CLOSES;
        dev->types[3] = _DRM_STAT_IOCTLS;
        dev->types[4] = _DRM_STAT_LOCKS;
        dev->types[5] = _DRM_STAT_UNLOCKS;

        /*
         * FIXME Linux<->FreeBSD: this is done in drm_setup() on Linux.
         */
        for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
                atomic_set(&dev->counts[i], 0);

        dev->driver = driver;

        retcode = drm_pci_agp_init(dev);
        if (retcode)
                goto error_out_unreg;



        retcode = drm_ctxbitmap_init(dev);
        if (retcode) {
                DRM_ERROR("Cannot allocate memory for context bitmap.\n");
                goto error_out_unreg;
        }

        if (driver->driver_features & DRIVER_GEM) {
                retcode = drm_gem_init(dev);
                if (retcode) {
                        DRM_ERROR("Cannot initialize graphics execution "
                                  "manager (GEM)\n");
                        goto error_out_unreg;
                }
        }

        retcode = drm_sysctl_init(dev);
        if (retcode != 0) {
                DRM_ERROR("Failed to create hw.dri sysctl entry: %d\n",
                    retcode);
        }

        return 0;

      error_out_unreg:
        drm_cancel_fill_in_dev(dev);
        return retcode;
}
EXPORT_SYMBOL(drm_fill_in_dev);

void drm_cancel_fill_in_dev(struct drm_device *dev)
{
        struct drm_driver *driver;

        driver = dev->driver;

        drm_sysctl_cleanup(dev);
        if (driver->driver_features & DRIVER_GEM)
                drm_gem_destroy(dev);
        drm_ctxbitmap_cleanup(dev);

        if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
            dev->agp && dev->agp->agp_mtrr >= 0) {
                int retval;
                retval = drm_mtrr_del(dev->agp->agp_mtrr,
                                  dev->agp->agp_info.ai_aperture_base,
                                  dev->agp->agp_info.ai_aperture_size,
                                  DRM_MTRR_WC);
                DRM_DEBUG("mtrr_del=%d\n", retval);
        }
        free(dev->agp, DRM_MEM_AGPLISTS);
        dev->agp = NULL;

        drm_ht_remove(&dev->map_hash);

        mtx_destroy(&dev->irq_lock);
        mtx_destroy(&dev->count_lock);
        mtx_destroy(&dev->event_lock);
        sx_destroy(&dev->dev_struct_lock);
        mtx_destroy(&dev->ctxlist_mutex);
        mtx_destroy(&dev->pcir_lock);
}

/**
 * Get a secondary minor number.
 *
 * \param dev device data structure
 * \param sec-minor structure to hold the assigned minor
 * \return negative number on failure.
 *
 * Search an empty entry and initialize it to the given parameters, and
 * create the proc init entry via proc_init(). This routines assigns
 * minor numbers to secondary heads of multi-headed cards
 */
int drm_get_minor(struct drm_device *dev, struct drm_minor **minor, int type)
{
        struct drm_minor *new_minor;
        int ret;
        int minor_id;
        const char *minor_devname;

        DRM_DEBUG("\n");

        minor_id = drm_minor_get_id(dev, type);
        if (minor_id < 0)
                return minor_id;

        new_minor = malloc(sizeof(struct drm_minor), DRM_MEM_MINOR,
            M_NOWAIT | M_ZERO);
        if (!new_minor) {
                ret = -ENOMEM;
                goto err_idr;
        }

        new_minor->type = type;
        new_minor->dev = dev;
        new_minor->index = minor_id;
        INIT_LIST_HEAD(&new_minor->master_list);

        new_minor->buf_sigio = NULL;

        switch (type) {
        case DRM_MINOR_CONTROL:
                minor_devname = "dri/controlD%d";
                break;
        case DRM_MINOR_RENDER:
                minor_devname = "dri/renderD%d";
                break;
        default:
                minor_devname = "dri/card%d";
                break;
        }

        ret = make_dev_p(MAKEDEV_WAITOK | MAKEDEV_CHECKNAME, &new_minor->device,
            &drm_cdevsw, 0, DRM_DEV_UID, DRM_DEV_GID,
            DRM_DEV_MODE, minor_devname, minor_id);
        if (ret) {
                DRM_ERROR("Failed to create cdev: %d\n", ret);
                goto err_mem;
        }
        new_minor->device->si_drv1 = new_minor;
        *minor = new_minor;

        DRM_DEBUG("new minor assigned %d\n", minor_id);
        return 0;


err_mem:
        free(new_minor, DRM_MEM_MINOR);
err_idr:
        *minor = NULL;
        return ret;
}
EXPORT_SYMBOL(drm_get_minor);

/**
 * Put a secondary minor number.
 *
 * \param sec_minor - structure to be released
 * \return always zero
 *
 * Cleans up the proc resources. Not legal for this to be the
 * last minor released.
 *
 */
int drm_put_minor(struct drm_minor **minor_p)
{
        struct drm_minor *minor = *minor_p;

        DRM_DEBUG("release secondary minor %d\n", minor->index);

        funsetown(&minor->buf_sigio);

        destroy_dev(minor->device);

        free(minor, DRM_MEM_MINOR);
        *minor_p = NULL;
        return 0;
}
EXPORT_SYMBOL(drm_put_minor);

/**
 * Called via drm_exit() at module unload time or when pci device is
 * unplugged.
 *
 * Cleans up all DRM device, calling drm_lastclose().
 *
 */
void drm_put_dev(struct drm_device *dev)
{
        struct drm_driver *driver;
        struct drm_map_list *r_list, *list_temp;

        DRM_DEBUG("\n");

        if (!dev) {
                DRM_ERROR("cleanup called no dev\n");
                return;
        }
        driver = dev->driver;

        drm_lastclose(dev);

        if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
            dev->agp && dev->agp->agp_mtrr >= 0) {
                int retval;
                retval = drm_mtrr_del(dev->agp->agp_mtrr,
                                  dev->agp->agp_info.ai_aperture_base,
                                  dev->agp->agp_info.ai_aperture_size,
                                  DRM_MTRR_WC);
                DRM_DEBUG("mtrr_del=%d\n", retval);
        }

        if (drm_core_check_feature(dev, DRIVER_MODESET))
                drm_mode_group_free(&dev->primary->mode_group);

        if (dev->driver->unload)
                dev->driver->unload(dev);

        drm_sysctl_cleanup(dev);

        if (drm_core_has_AGP(dev) && dev->agp) {
                free(dev->agp, DRM_MEM_AGPLISTS);
                dev->agp = NULL;
        }

        drm_vblank_cleanup(dev);

        list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
                drm_rmmap(dev, r_list->map);
        drm_ht_remove(&dev->map_hash);

        drm_ctxbitmap_cleanup(dev);

        if (drm_core_check_feature(dev, DRIVER_MODESET))
                drm_put_minor(&dev->control);

        if (driver->driver_features & DRIVER_GEM)
                drm_gem_destroy(dev);

        drm_put_minor(&dev->primary);

        mtx_destroy(&dev->irq_lock);
        mtx_destroy(&dev->count_lock);
        mtx_destroy(&dev->event_lock);
        sx_destroy(&dev->dev_struct_lock);
        mtx_destroy(&dev->ctxlist_mutex);
        mtx_destroy(&dev->pcir_lock);

#ifdef FREEBSD_NOTYET
        list_del(&dev->driver_item);
#endif /* FREEBSD_NOTYET */
}
EXPORT_SYMBOL(drm_put_dev);