drm_ioctl.c

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/*
 * Created: Fri Jan  8 09:01:26 1999 by [email protected]
 *
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 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
 * VA LINUX SYSTEMS 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 <drm/drmP.h>
#include <drm/drm_core.h>

#include <linux/pci.h>
#include <linux/export.h>

int drm_getunique(struct drm_device *dev, void *data,
          struct drm_file *file_priv)
{
    struct drm_unique *u = data;
    struct drm_master *master = file_priv->master;

    if (u->unique_len >= master->unique_len) {
        if (copy_to_user(u->unique, master->unique, master->unique_len))
            return -EFAULT;
    }
    u->unique_len = master->unique_len;

    return 0;
}

static void
drm_unset_busid(struct drm_device *dev,
        struct drm_master *master)
{
    kfree(dev->devname);
    dev->devname = NULL;

    kfree(master->unique);
    master->unique = NULL;
    master->unique_len = 0;
    master->unique_size = 0;
}

int drm_setunique(struct drm_device *dev, void *data,
          struct drm_file *file_priv)
{
    struct drm_unique *u = data;
    struct drm_master *master = file_priv->master;
    int ret;

    if (master->unique_len || master->unique)
        return -EBUSY;

    if (!u->unique_len || u->unique_len > 1024)
        return -EINVAL;

    if (!dev->driver->bus->set_unique)
        return -EINVAL;

    ret = dev->driver->bus->set_unique(dev, master, u);
    if (ret)
        goto err;

    return 0;

err:
    drm_unset_busid(dev, master);
    return ret;
}

static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
{
    struct drm_master *master = file_priv->master;
    int ret;

    if (master->unique != NULL)
        drm_unset_busid(dev, master);

    ret = dev->driver->bus->set_busid(dev, master);
    if (ret)
        goto err;
    return 0;
err:
    drm_unset_busid(dev, master);
    return ret;
}

int drm_getmap(struct drm_device *dev, void *data,
           struct drm_file *file_priv)
{
    struct drm_map *map = data;
    struct drm_map_list *r_list = NULL;
    struct list_head *list;
    int idx;
    int i;

    idx = map->offset;
    if (idx < 0)
        return -EINVAL;

    i = 0;
    mutex_lock(&dev->struct_mutex);
    list_for_each(list, &dev->maplist) {
        if (i == idx) {
            r_list = list_entry(list, struct drm_map_list, head);
            break;
        }
        i++;
    }
    if (!r_list || !r_list->map) {
        mutex_unlock(&dev->struct_mutex);
        return -EINVAL;
    }

    map->offset = r_list->map->offset;
    map->size = r_list->map->size;
    map->type = r_list->map->type;
    map->flags = r_list->map->flags;
    map->handle = (void *)(unsigned long) r_list->user_token;
    map->mtrr = r_list->map->mtrr;
    mutex_unlock(&dev->struct_mutex);

    return 0;
}

int drm_getclient(struct drm_device *dev, void *data,
          struct drm_file *file_priv)
{
    struct drm_client *client = data;
    struct drm_file *pt;
    int idx;
    int i;

    idx = client->idx;
    i = 0;

    mutex_lock(&dev->struct_mutex);
    list_for_each_entry(pt, &dev->filelist, lhead) {
        if (i++ >= idx) {
            client->auth = pt->authenticated;
            client->pid = pid_vnr(pt->pid);
            client->uid = from_kuid_munged(current_user_ns(), pt->uid);
            client->magic = pt->magic;
            client->iocs = pt->ioctl_count;
            mutex_unlock(&dev->struct_mutex);

            return 0;
        }
    }
    mutex_unlock(&dev->struct_mutex);

    return -EINVAL;
}

int drm_getstats(struct drm_device *dev, void *data,
         struct drm_file *file_priv)
{
    struct drm_stats *stats = data;
    int i;

    memset(stats, 0, sizeof(*stats));

    for (i = 0; i < dev->counters; i++) {
        if (dev->types[i] == _DRM_STAT_LOCK)
            stats->data[i].value =
                (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0);
        else
            stats->data[i].value = atomic_read(&dev->counts[i]);
        stats->data[i].type = dev->types[i];
    }

    stats->count = dev->counters;

    return 0;
}

int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
    struct drm_get_cap *req = data;

    req->value = 0;
    switch (req->capability) {
    case DRM_CAP_DUMB_BUFFER:
        if (dev->driver->dumb_create)
            req->value = 1;
        break;
    case DRM_CAP_VBLANK_HIGH_CRTC:
        req->value = 1;
        break;
    case DRM_CAP_DUMB_PREFERRED_DEPTH:
        req->value = dev->mode_config.preferred_depth;
        break;
    case DRM_CAP_DUMB_PREFER_SHADOW:
        req->value = dev->mode_config.prefer_shadow;
        break;
    case DRM_CAP_PRIME:
        req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
        req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
        break;
    default:
        return -EINVAL;
    }
    return 0;
}

int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
    struct drm_set_version *sv = data;
    int if_version, retcode = 0;

    if (sv->drm_di_major != -1) {
        if (sv->drm_di_major != DRM_IF_MAJOR ||
            sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
            retcode = -EINVAL;
            goto done;
        }
        if_version = DRM_IF_VERSION(sv->drm_di_major,
                        sv->drm_di_minor);
        dev->if_version = max(if_version, dev->if_version);
        if (sv->drm_di_minor >= 1) {
            /*
             * Version 1.1 includes tying of DRM to specific device
             * Version 1.4 has proper PCI domain support
             */
            retcode = drm_set_busid(dev, file_priv);
            if (retcode)
                goto done;
        }
    }

    if (sv->drm_dd_major != -1) {
        if (sv->drm_dd_major != dev->driver->major ||
            sv->drm_dd_minor < 0 || sv->drm_dd_minor >
            dev->driver->minor) {
            retcode = -EINVAL;
            goto done;
        }

        if (dev->driver->set_version)
            dev->driver->set_version(dev, sv);
    }

done:
    sv->drm_di_major = DRM_IF_MAJOR;
    sv->drm_di_minor = DRM_IF_MINOR;
    sv->drm_dd_major = dev->driver->major;
    sv->drm_dd_minor = dev->driver->minor;

    return retcode;
}

int drm_noop(struct drm_device *dev, void *data,
         struct drm_file *file_priv)
{
    DRM_DEBUG("\n");
    return 0;
}
EXPORT_SYMBOL(drm_noop);