drm/src/drm_sunmod.c

	drm_sunmod.c revision 1450
851N/A/*
851N/A * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
851N/A *
851N/A * Permission is hereby granted, free of charge, to any person obtaining a
883N/A * copy of this software and associated documentation files (the "Software"),
851N/A * to deal in the Software without restriction, including without limitation
851N/A * the rights to use, copy, modify, merge, publish, distribute, sublicense,
851N/A * and/or sell copies of the Software, and to permit persons to whom the
851N/A * Software is furnished to do so, subject to the following conditions:
851N/A *
851N/A * The above copyright notice and this permission notice (including the next
851N/A * paragraph) shall be included in all copies or substantial portions of the
851N/A * Software.
851N/A *
851N/A * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
851N/A * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
851N/A * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
851N/A * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
851N/A * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
851N/A * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
851N/A * DEALINGS IN THE SOFTWARE.
851N/A */
851N/A
851N/A/*
851N/A * Copyright (c) 2012, 2013 Intel Corporation.  All rights reserved.
851N/A */
851N/A
851N/A/*
851N/A * Common misc module interfaces of DRM under Solaris
851N/A */
851N/A
851N/A/*
851N/A * This module calls into gfx and agpmaster misc modules respectively
851N/A * for generic graphics operations and AGP master device support.
851N/A */
851N/A
851N/A#include "drm_sunmod.h"
851N/A#include "drm_sun_idr.h"
883N/A#include <sys/modctl.h>
851N/A#include <sys/kmem.h>
911N/A#include <vm/seg_kmem.h>
911N/A
911N/Aint drm_debug_flag = 0;
911N/Aint mdb_track_enable = B_FALSE;
851N/A
851N/A/* Identifier of this driver */
851N/Astatic struct vis_identifier text_ident = { "SUNWdrm" };
851N/A
851N/Astatic ddi_device_acc_attr_t dev_attr = {
851N/A    DDI_DEVICE_ATTR_V0,
851N/A    DDI_NEVERSWAP_ACC,
851N/A    DDI_STRICTORDER_ACC,
851N/A    DDI_FLAGERR_ACC
851N/A};
851N/A
851N/Astatic ddi_device_acc_attr_t gem_dev_attr = {
851N/A    DDI_DEVICE_ATTR_V0,
851N/A    DDI_NEVERSWAP_ACC,
851N/A    DDI_MERGING_OK_ACC,
851N/A    DDI_FLAGERR_ACC
851N/A};
851N/A
851N/Aextern int __init drm_core_init(void);
851N/Aextern void __exit drm_core_exit(void);
851N/Aextern int drm_get_pci_index_reg(dev_info_t *, uint_t, uint_t, off_t *);
851N/A
851N/Astruct find_gem_object {
851N/A    offset_t offset;
851N/A    struct drm_gem_object *obj;
851N/A};
851N/A
851N/Astatic int
851N/Adrm_devmap_map(devmap_cookie_t dhc, dev_t dev_id, uint_t flags,
    offset_t offset, size_t len, void **new_priv)
{
    _NOTE(ARGUNUSED(offset, len))

    devmap_handle_t *dhp;
    struct ddi_umem_cookie  *cp;
    struct drm_minor *minor;
    struct drm_device *dev;
    int minor_id;

    minor_id = DRM_DEV2MINOR(dev_id);
    minor = idr_find(&drm_minors_idr, minor_id);
    if (!minor)
        return (ENODEV);
    dev = minor->dev;

    /*
     * This driver only supports MAP_SHARED,
     * and doesn't support MAP_PRIVATE
     */
    if (flags & MAP_PRIVATE) {
        DRM_ERROR("Not support MAP_PRIVATE");
        return (EINVAL);
    }

    mutex_enter(&dev->struct_mutex);
    dhp = (devmap_handle_t *)dhc;
    cp = (struct ddi_umem_cookie *)dhp->dh_cookie;
    cp->cook_refcnt = 1;
    mutex_exit(&dev->struct_mutex);

    *new_priv = dev;
    return (0);
}

static int
drm_devmap_dup(devmap_cookie_t dhc, void *pvtp, devmap_cookie_t new_dhc,
    void **new_pvtp)
{
    _NOTE(ARGUNUSED(new_dhc))

    struct drm_device *dev = (struct drm_device *)pvtp;
    devmap_handle_t *dhp;
    struct ddi_umem_cookie *cp;

    mutex_enter(&dev->struct_mutex);
    dhp = (devmap_handle_t *)dhc;
    cp = (struct ddi_umem_cookie *)dhp->dh_cookie;
    cp->cook_refcnt++;
    mutex_exit(&dev->struct_mutex);

    *new_pvtp = dev;
    return (0);
}

static void
drm_devmap_unmap(devmap_cookie_t dhc, void *pvtp, offset_t off, size_t len,
    devmap_cookie_t new_dhp1, void **new_pvtp1, devmap_cookie_t new_dhp2,
    void **new_pvtp2)
{
    _NOTE(ARGUNUSED(off, len))

    struct drm_device *dev;
    devmap_handle_t *dhp;
    devmap_handle_t *ndhp;
    struct ddi_umem_cookie  *cp;
    struct ddi_umem_cookie  *ncp;

    dhp = (devmap_handle_t *)dhc;
    dev = (struct drm_device *)pvtp;

    mutex_enter(&dev->struct_mutex);

    cp = (struct ddi_umem_cookie *)dhp->dh_cookie;
    if (new_dhp1 != NULL) {
        ndhp = (devmap_handle_t *)new_dhp1;
        ncp = (struct ddi_umem_cookie *)ndhp->dh_cookie;
        ncp->cook_refcnt++;
        *new_pvtp1 = dev;
        ASSERT(ncp == cp);
    }

    if (new_dhp2 != NULL) {
        ndhp = (devmap_handle_t *)new_dhp2;
        ncp = (struct ddi_umem_cookie *)ndhp->dh_cookie;
        ncp->cook_refcnt++;
        *new_pvtp2 = dev;
        ASSERT(ncp == cp);
    }

    /* FIXME: dh_cookie should not be released here. */
#if 0
    cp->cook_refcnt--;
    if (cp->cook_refcnt == 0) {
        gfxp_umem_cookie_destroy(dhp->dh_cookie);
        dhp->dh_cookie = NULL;
    }
#endif

    mutex_exit(&dev->struct_mutex);
}

static struct devmap_callback_ctl drm_devmap_callbacks = {
    DEVMAP_OPS_REV,         /* devmap_rev */
    drm_devmap_map,         /* devmap_map */
    NULL,               /* devmap_access */
    drm_devmap_dup,         /* devmap_dup */
    drm_devmap_unmap        /* devmap_unmap */
};

static struct drm_local_map *
__find_local_map(struct drm_device *dev, offset_t offset)
{
    struct drm_map_list *entry;

    entry = idr_find(&dev->map_idr, offset >> PAGE_SHIFT);
    if (entry)
        return (entry->map);

    return (NULL);
}

static int
drm_gem_map(devmap_cookie_t dhp, dev_t dev, uint_t flags, offset_t off,
        size_t len, void **pvtp)
{
    _NOTE(ARGUNUSED(dhp, flags, len))

    struct drm_device *drm_dev;
    struct drm_minor *minor;
    int minor_id = DRM_DEV2MINOR(dev);
    drm_local_map_t *map = NULL;

    minor = idr_find(&drm_minors_idr, minor_id);
    if (!minor)
        return (ENODEV);
    if (!minor->dev)
        return (ENODEV);

    drm_dev = minor->dev;

    mutex_enter(&drm_dev->struct_mutex);
    map = __find_local_map(drm_dev, off);
    if (!map) {
        mutex_exit(&drm_dev->struct_mutex);
        *pvtp = NULL;
        return (DDI_EINVAL);
    }

    mutex_exit(&drm_dev->struct_mutex);

    *pvtp = map->handle;

    return (DDI_SUCCESS);
}

static int
drm_gem_map_access(devmap_cookie_t dhp, void *pvt, offset_t offset, size_t len,
        uint_t type, uint_t rw)
{
    struct drm_device *dev;
    struct drm_gem_object *obj;
    struct gem_map_list *seg;

    obj = (struct drm_gem_object *)pvt;
    if (obj == NULL) {
        goto next;
    }

    dev = obj->dev;
    if (dev->driver->gem_fault != NULL)
        dev->driver->gem_fault(obj);

next:
    if (devmap_load(dhp, offset, len, type, rw)) {
        return (DDI_FAILURE);
    }
    if (obj != NULL) {
        seg = drm_alloc(sizeof (struct gem_map_list), DRM_MEM_MAPS);
        if (seg != NULL) {
            mutex_lock(&dev->page_fault_lock);
            seg->dhp = dhp;
            seg->mapoffset = offset;
            seg->maplen = len;
            list_add_tail(&seg->head, &obj->seg_list, (caddr_t)seg);
            mutex_unlock(&dev->page_fault_lock);
        }
    }
    return (DDI_SUCCESS);
}

static void
drm_gem_unmap(devmap_cookie_t dhp, void *pvtp, offset_t off, size_t len,
        devmap_cookie_t new_dhp1, void **newpvtp1,
        devmap_cookie_t new_dhp2, void **newpvtp2)
{
    struct drm_device *dev;
    struct drm_gem_object *obj;
    struct gem_map_list *entry, *temp;

    _NOTE(ARGUNUSED(dhp, pvtp, off, len, new_dhp1, newpvtp1))
    _NOTE(ARGUNUSED(new_dhp2, newpvtp2))

    obj = (struct drm_gem_object *)pvtp;
    if (obj == NULL)
        return;

    dev = obj->dev;

    mutex_lock(&dev->page_fault_lock);
    if (list_empty(&obj->seg_list)) {
        mutex_unlock(&dev->page_fault_lock);
        return;
    }

    list_for_each_entry_safe(entry, temp, struct gem_map_list,
        &obj->seg_list, head) {
        (void) devmap_unload(entry->dhp, entry->mapoffset,
            entry->maplen);
        list_del(&entry->head);
        drm_free(entry, sizeof (struct gem_map_list), DRM_MEM_MAPS);
    }

    mutex_unlock(&dev->page_fault_lock);
}

static struct devmap_callback_ctl drm_gem_map_ops = {
    DEVMAP_OPS_REV,     /* devmap_ops version number */
    drm_gem_map,        /* devmap_ops map routine */
    drm_gem_map_access, /* devmap_ops access routine */
    NULL,           /* devmap_ops dup routine */
    drm_gem_unmap,      /* devmap_ops unmap routine */
};

static int
__devmap_general(struct drm_device *dev, devmap_cookie_t dhp,
    struct drm_local_map *map, size_t len, size_t *maplen)
{
    off_t regoff;
    int regno, ret;

    regno = drm_get_pci_index_reg(dev->devinfo,
        map->offset, (uint_t)len, &regoff);
    if (regno < 0) {
        DRM_ERROR("drm_get_pci_index_reg() failed");
        return (-EINVAL);
    }

    ret = devmap_devmem_setup(dhp, dev->devinfo, NULL,
        regno, (offset_t)regoff, len, PROT_ALL,
        0, &dev_attr);
    if (ret != DDI_SUCCESS) {
        DRM_ERROR("devmap_devmem_setup failed, ret=%d", ret);
        return (-EFAULT);
    }

    *maplen = len;
    return (0);
}

static int
__devmap_shm(struct drm_device *dev, devmap_cookie_t dhp,
    struct drm_local_map *map, size_t len, size_t *maplen)
{
    int ret;

    if (!map->umem_cookie)
        return (-EINVAL);

    len = ptob(btopr(map->size));

    ret = devmap_umem_setup(dhp, dev->devinfo,
        NULL, map->umem_cookie, 0, len, PROT_ALL,
        IOMEM_DATA_CACHED, NULL);
    if (ret != DDI_SUCCESS) {
        DRM_ERROR("devmap_umem_setup failed, ret=%d", ret);
        return (-EFAULT);
    }

    *maplen = len;
    return (0);
}

static int
__devmap_agp(struct drm_device *dev, devmap_cookie_t dhp,
    struct drm_local_map *map, size_t len, size_t *maplen)
{
    int ret;

    if (dev->agp == NULL) {
        DRM_ERROR("attempted to mmap AGP"
            "memory before AGP support is enabled");
        return (-ENODEV);
    }

    len = ptob(btopr(len));

    ret = devmap_umem_setup(dhp, dev->devinfo,
        &drm_devmap_callbacks, map->umem_cookie, 0, len, PROT_ALL,
        IOMEM_DATA_UNCACHED | DEVMAP_ALLOW_REMAP, &dev_attr);
    if (ret != DDI_SUCCESS) {
        DRM_ERROR("devmap_umem_setup() failed, ret=%d", ret);
        return (-EFAULT);
    }

    *maplen = len;
    return (0);
}

static int
__devmap_sg(struct drm_device *dev, devmap_cookie_t dhp,
    struct drm_local_map *map, size_t len, size_t *maplen)
{
    int ret;

    len = ptob(btopr(len));
    if (len > map->size) {
        DRM_ERROR("offset=0x%lx, virtual=0x%p, "
            "mapsize=0x%lx, len=0x%lx",
            map->offset, dev->sg->virtual, map->size, len);
        return (-EINVAL);
    }

    ret = devmap_umem_setup(dhp, dev->devinfo,
        &drm_devmap_callbacks, map->umem_cookie, 0, len, PROT_ALL,
        IOMEM_DATA_UNCACHED | DEVMAP_ALLOW_REMAP, &dev_attr);
    if (ret != DDI_SUCCESS) {
        DRM_ERROR("devmap_umem_setup() fail");
        return (-EFAULT);
    }

    *maplen = len;
    return (0);
}

static int
__devmap_gem(struct drm_device *dev, devmap_cookie_t dhp,
    struct drm_local_map *map, size_t *maplen)
{
    struct devmap_callback_ctl *callbackops = NULL;
    int ret;

    if (map->callback == 1) {
        callbackops = &drm_gem_map_ops;
    }

    if (!map->umem_cookie)
        return (-EINVAL);

    ret = gfxp_devmap_umem_setup(dhp, dev->devinfo, callbackops,
        map->umem_cookie, 0, map->size, PROT_ALL,
        IOMEM_DATA_UC_WR_COMBINE | DEVMAP_ALLOW_REMAP, &gem_dev_attr);
    if (ret != DDI_SUCCESS) {
        DRM_ERROR("gfxp_devmap_umem_setup failed, ret=%d", ret);
        return (-EFAULT);
    }

    *maplen = map->size;
    return (0);
}

static int
drm_sun_open(dev_t *dev_id, int flag, int otyp, cred_t *credp)
{
    _NOTE(ARGUNUSED(otyp))

    int minor_id = DRM_DEV2MINOR(*dev_id);
    struct drm_minor *minor;
    int clone_id;
    int ret;

    minor = idr_find(&drm_minors_idr, minor_id);
    if (!minor)
        return (ENODEV);
    if (!minor->dev)
        return (ENODEV);

    /*
     * No operations for VGA & AGP mater devices, always return OK.
     */
    if (DRM_MINOR_IS_VGATEXT(minor_id))
        return (0);

    if (DRM_MINOR_IS_AGPMASTER(minor_id))
        return (0);

    /*
     * Drm driver implements a software lock to serialize access
     * to graphics hardware based on per-process granulation. Before
     * operating graphics hardware, all clients, including kernel
     * and applications, must acquire this lock via DRM_IOCTL_LOCK
     * ioctl, and release it via DRM_IOCTL_UNLOCK after finishing
     * operations. Drm driver will grant r/w permission to the
     * process which acquires this lock (Kernel is assumed to have
     * process ID 0).
     *
     * A process might be terminated without releasing drm lock, in
     * this case, drm driver is responsible for clearing the holding.
     * To be informed of process exiting, drm driver uses clone open
     * to guarantee that each call to open(9e) have one corresponding
     * call to close(9e). In most cases, a process will close drm
     * during process termination, so that drm driver could have a
     * chance to release drm lock.
     *
     * In fact, a driver cannot know exactly when a process exits.
     * Clone open doesn't address this issue completely: Because of
     * inheritance, child processes inherit file descriptors from
     * their parent. As a result, if the parent exits before its
     * children, drm close(9e) entrypoint won't be called until all
     * of its children terminate.
     *
     * Another issue brought up by inhertance is the process PID
     * that calls the drm close() entry point may not be the same
     * as the one who called open(). Per-process struct is allocated
     * when a process first open() drm, and released when the process
     * last close() drm. Since open()/close() may be not the same
     * process, PID cannot be used for key to lookup per-process
     * struct. So, we associate minor number with per-process struct
     * during open()'ing, and find corresponding process struct
     * via minor number when close() is called.
     */
    ret = idr_get_new_above(&minor->clone_idr, NULL, 0, &clone_id);
    if (ret)
        return (EMFILE);

    if (clone_id > DRM_CLONEID_MAX) {
        (void) idr_remove(&minor->clone_idr, clone_id);
        return (EMFILE);
    }

    ret = drm_open(minor, clone_id, flag, credp);
    if (ret) {
        (void) idr_remove(&minor->clone_idr, clone_id);
        return (-ret);
    }

    *dev_id = DRM_MAKEDEV(getmajor(*dev_id), minor_id, clone_id);

    return (-ret);
}

static int
drm_sun_close(dev_t dev_id, int flag, int otyp, cred_t *credp)
{
    _NOTE(ARGUNUSED(flag, otyp, credp))

    struct drm_minor *minor;
    struct drm_file *file_priv;
    int minor_id = DRM_DEV2MINOR(dev_id);
    int clone_id = DRM_DEV2CLONEID(dev_id);
    int ret = 0;

    minor = idr_find(&drm_minors_idr, minor_id);
    if (!minor)
        return (ENODEV);
    if (!minor->dev)
        return (ENODEV);

    /*
     * No operations for VGA & AGP mater devices, always return OK.
     */
    if (DRM_MINOR_IS_VGATEXT(minor_id))
        return (0);

    if (DRM_MINOR_IS_AGPMASTER(minor_id))
        return (0);

    file_priv = idr_find(&minor->clone_idr, clone_id);
    if (!file_priv)
        return (EBADF);

    ret = drm_release(file_priv);
    if (ret)
        return (-ret);

    (void) idr_remove(&minor->clone_idr, clone_id);

    return (0);
}

static int
drm_sun_ioctl(dev_t dev_id, int cmd, intptr_t arg, int mode, cred_t *credp,
    int *rvalp)
{
    struct drm_minor *minor;
    struct drm_file *file_priv;
    int minor_id = DRM_DEV2MINOR(dev_id);
    int clone_id = DRM_DEV2CLONEID(dev_id);

    minor = idr_find(&drm_minors_idr, minor_id);
    if (!minor)
        return (ENODEV);
    if (!minor->dev)
        return (ENODEV);

    if (cmd == VIS_GETIDENTIFIER) {
        if (ddi_copyout(&text_ident, (void *)arg,
            sizeof (struct vis_identifier), mode))
            return (EFAULT);
    }

    if (DRM_MINOR_IS_VGATEXT(minor_id))
        return (gfxp_vgatext_ioctl(dev_id, cmd, arg, mode, credp,
            rvalp, minor->private));

    if (DRM_MINOR_IS_AGPMASTER(minor_id))
        return (agpmaster_ioctl(dev_id, cmd, arg, mode, credp,
            rvalp, minor->private));

    file_priv = idr_find(&minor->clone_idr, clone_id);
    if (!file_priv)
        return (EBADF);

    return (-(drm_ioctl(dev_id, file_priv, cmd, arg, mode, credp)));
}

static int
drm_sun_devmap(dev_t dev_id, devmap_cookie_t dhp, offset_t offset,
    size_t len, size_t *maplen, uint_t model)
{
    struct drm_device *dev;
    struct drm_minor *minor;
    struct drm_file *file_priv;
    int minor_id = DRM_DEV2MINOR(dev_id);
    int clone_id = DRM_DEV2CLONEID(dev_id);
    drm_local_map_t *map = NULL;

    minor = idr_find(&drm_minors_idr, minor_id);
    if (!minor)
        return (ENODEV);
    if (!minor->dev)
        return (ENODEV);

    dev = minor->dev;

    if (DRM_MINOR_IS_VGATEXT(minor_id))
        return (gfxp_vgatext_devmap(dev_id, dhp, offset, len,
            maplen, model, minor->private));

    if (DRM_MINOR_IS_AGPMASTER(minor_id))
        return (ENOTSUP);

    file_priv = idr_find(&minor->clone_idr, clone_id);
    if (!file_priv)
        return (EBADF);

    mutex_enter(&dev->struct_mutex);
    map = __find_local_map(dev, offset);
    if (!map) {
        mutex_exit(&dev->struct_mutex);
        return (EFAULT);
    }
    if (map->flags & _DRM_RESTRICTED) {
        mutex_exit(&dev->struct_mutex);
        return (ENOTSUP);
    }
    mutex_exit(&dev->struct_mutex);

    switch (map->type) {
    case _DRM_FRAME_BUFFER:
    case _DRM_REGISTERS:
        return (__devmap_general(dev, dhp, map, len, maplen));

    case _DRM_SHM:
        return (__devmap_shm(dev, dhp, map, len, maplen));

    case _DRM_AGP:
        return (__devmap_agp(dev, dhp, map, len, maplen));

    case _DRM_SCATTER_GATHER:
        return (__devmap_sg(dev, dhp, map, len, maplen));

    case _DRM_GEM:
        return (__devmap_gem(dev, dhp, map, maplen));
    }

    return (ENOTSUP);
}

static int
drm_sun_read(dev_t dev_id, struct uio *uiop, cred_t *credp)
{
    _NOTE(ARGUNUSED(credp))

    struct drm_minor *minor;
    struct drm_file *file_priv;
    int minor_id = DRM_DEV2MINOR(dev_id);
    int clone_id = DRM_DEV2CLONEID(dev_id);

    minor = idr_find(&drm_minors_idr, minor_id);
    if (!minor)
        return (ENODEV);
    if (!minor->dev)
        return (ENODEV);

    /*
     * No operations for VGA & AGP master devices, always return OK.
     */
    if (DRM_MINOR_IS_VGATEXT(minor_id))
        return (0);

    if (DRM_MINOR_IS_AGPMASTER(minor_id))
        return (0);

    file_priv = idr_find(&minor->clone_idr, clone_id);
    if (!file_priv)
        return (EBADF);

    (void) drm_read(file_priv, uiop);
    return (0);
}

static int
drm_sun_chpoll(dev_t dev_id, short events, int anyyet, short *reventsp,
    struct pollhead **phpp)
{
    struct drm_minor *minor;
    struct drm_file *file_priv;
    int minor_id = DRM_DEV2MINOR(dev_id);
    int clone_id = DRM_DEV2CLONEID(dev_id);

    minor = idr_find(&drm_minors_idr, minor_id);
    if (!minor)
        return (ENODEV);
    if (!minor->dev)
        return (ENODEV);

    /*
     * No operations for VGA & AGP master devices, always return OK.
     */
    if (DRM_MINOR_IS_VGATEXT(minor_id))
        return (0);

    if (DRM_MINOR_IS_AGPMASTER(minor_id))
        return (0);

    file_priv = idr_find(&minor->clone_idr, clone_id);
    if (!file_priv)
        return (EBADF);

    if (!anyyet) {
        *phpp = &file_priv->drm_pollhead;
    }

    *reventsp = drm_poll(file_priv, events);
    return (0);
}

/*
 * Common device operations structure for all DRM drivers
 */
struct cb_ops drm_cb_ops = {
    drm_sun_open,           /* cb_open */
    drm_sun_close,          /* cb_close */
    nodev,              /* cb_strategy */
    nodev,              /* cb_print */
    nodev,              /* cb_dump */
    drm_sun_read,           /* cb_read */
    nodev,              /* cb_write */
    drm_sun_ioctl,          /* cb_ioctl */
    drm_sun_devmap,         /* cb_devmap */
    nodev,              /* cb_mmap */
    NULL,               /* cb_segmap */
    drm_sun_chpoll,         /* cb_chpoll */
    ddi_prop_op,            /* cb_prop_op */
    0,              /* cb_stream */
    D_NEW | D_MTSAFE | D_DEVMAP /* cb_flag */
};

static struct modlmisc modlmisc = {
    &mod_miscops, "DRM common interfaces"
};

static struct modlinkage modlinkage = {
    MODREV_1, (void *)&modlmisc, NULL
};

int
_init(void)
{
    int ret;

    ret = mod_install(&modlinkage);
    if (ret)
        return (ret);

    return (drm_core_init());
}

int
_fini(void)
{
    int ret;

    ret = mod_remove(&modlinkage);
    if (ret)
        return (ret);

    drm_core_exit();

    return (0);
}

int
_info(struct modinfo *modinfop)
{
    return (mod_info(&modlinkage, modinfop));
}

struct drm_local_map *
drm_core_findmap(struct drm_device *dev, unsigned int token)
{
    struct drm_map_list *_entry;

    list_for_each_entry(_entry, struct drm_map_list, &dev->maplist, head) {
        if (_entry->user_token == token)
            return (_entry->map);
    }

    return (NULL);
}