drm_stub.c

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/*
 * Created: Fri Jan 19 10:48:35 2001 by [email protected]
 *
 * 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 <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <drm/drmP.h>
#include <drm/drm_core.h>

unsigned int drm_debug = 0; /* 1 to enable debug output */
EXPORT_SYMBOL(drm_debug);

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);

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_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);

struct idr drm_minors_idr;

struct class *drm_class;
struct proc_dir_entry *drm_proc_root;
struct dentry *drm_debugfs_root;

int drm_err(const char *func, const char *format, ...)
{
    struct va_format vaf;
    va_list args;
    int r;

    va_start(args, format);

    vaf.fmt = format;
    vaf.va = &args;

    r = printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* %pV", func, &vaf);

    va_end(args);

    return r;
}
EXPORT_SYMBOL(drm_err);

void drm_ut_debug_printk(unsigned int request_level,
             const char *prefix,
             const char *function_name,
             const char *format, ...)
{
    va_list args;

    if (drm_debug & request_level) {
        if (function_name)
            printk(KERN_DEBUG "[%s:%s], ", prefix, function_name);
        va_start(args, format);
        vprintk(format, args);
        va_end(args);
    }
}
EXPORT_SYMBOL(drm_ut_debug_printk);

static int drm_minor_get_id(struct drm_device *dev, int type)
{
    int new_id;
    int ret;
    int base = 0, limit = 63;

    if (type == DRM_MINOR_CONTROL) {
                base += 64;
                limit = base + 127;
        } else if (type == DRM_MINOR_RENDER) {
                base += 128;
                limit = base + 255;
        }

again:
    if (idr_pre_get(&drm_minors_idr, GFP_KERNEL) == 0) {
        DRM_ERROR("Out of memory expanding drawable idr\n");
        return -ENOMEM;
    }
    mutex_lock(&dev->struct_mutex);
    ret = idr_get_new_above(&drm_minors_idr, NULL,
                base, &new_id);
    mutex_unlock(&dev->struct_mutex);
    if (ret == -EAGAIN)
        goto again;
    else if (ret)
        return ret;

    if (new_id >= limit) {
        idr_remove(&drm_minors_idr, new_id);
        return -EINVAL;
    }
    return new_id;
}

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

    master = kzalloc(sizeof(*master), GFP_KERNEL);
    if (!master)
        return NULL;

    kref_init(&master->refcount);
    spin_lock_init(&master->lock.spinlock);
    init_waitqueue_head(&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)
{
    kref_get(&master->refcount);
    return master;
}
EXPORT_SYMBOL(drm_master_get);

static void drm_master_destroy(struct kref *kref)
{
    struct drm_master *master = container_of(kref, struct drm_master, refcount);
    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) {
        kfree(master->unique);
        master->unique = NULL;
        master->unique_len = 0;
    }

    kfree(dev->devname);
    dev->devname = NULL;

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

    drm_ht_remove(&master->magiclist);

    kfree(master);
}

void drm_master_put(struct drm_master **master)
{
    kref_put(&(*master)->refcount, drm_master_destroy);
    *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 &&
        file_priv->minor->master != file_priv->master) {
        mutex_lock(&dev->struct_mutex);
        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);
            }
        }
        mutex_unlock(&dev->struct_mutex);
    }

    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;

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

int drm_fill_in_dev(struct drm_device *dev,
               const struct pci_device_id *ent,
               struct drm_driver *driver)
{
    int retcode;

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

    spin_lock_init(&dev->count_lock);
    spin_lock_init(&dev->event_lock);
    mutex_init(&dev->struct_mutex);
    mutex_init(&dev->ctxlist_mutex);

    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;

    dev->driver = driver;

    if (dev->driver->bus->agp_init) {
        retcode = dev->driver->bus->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;
        }
    }

    return 0;

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


int drm_get_minor(struct drm_device *dev, struct drm_minor **minor, int type)
{
    struct drm_minor *new_minor;
    int ret;
    int minor_id;

    DRM_DEBUG("\n");

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

    new_minor = kzalloc(sizeof(struct drm_minor), GFP_KERNEL);
    if (!new_minor) {
        ret = -ENOMEM;
        goto err_idr;
    }

    new_minor->type = type;
    new_minor->device = MKDEV(DRM_MAJOR, minor_id);
    new_minor->dev = dev;
    new_minor->index = minor_id;
    INIT_LIST_HEAD(&new_minor->master_list);

    idr_replace(&drm_minors_idr, new_minor, minor_id);

    if (type == DRM_MINOR_LEGACY) {
        ret = drm_proc_init(new_minor, minor_id, drm_proc_root);
        if (ret) {
            DRM_ERROR("DRM: Failed to initialize /proc/dri.\n");
            goto err_mem;
        }
    } else
        new_minor->proc_root = NULL;

#if defined(CONFIG_DEBUG_FS)
    ret = drm_debugfs_init(new_minor, minor_id, drm_debugfs_root);
    if (ret) {
        DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
        goto err_g2;
    }
#endif

    ret = drm_sysfs_device_add(new_minor);
    if (ret) {
        printk(KERN_ERR
               "DRM: Error sysfs_device_add.\n");
        goto err_g2;
    }
    *minor = new_minor;

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


err_g2:
    if (new_minor->type == DRM_MINOR_LEGACY)
        drm_proc_cleanup(new_minor, drm_proc_root);
err_mem:
    kfree(new_minor);
err_idr:
    idr_remove(&drm_minors_idr, minor_id);
    *minor = NULL;
    return ret;
}
EXPORT_SYMBOL(drm_get_minor);

int drm_put_minor(struct drm_minor **minor_p)
{
    struct drm_minor *minor = *minor_p;

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

    if (minor->type == DRM_MINOR_LEGACY)
        drm_proc_cleanup(minor, drm_proc_root);
#if defined(CONFIG_DEBUG_FS)
    drm_debugfs_cleanup(minor);
#endif

    drm_sysfs_device_remove(minor);

    idr_remove(&drm_minors_idr, minor->index);

    kfree(minor);
    *minor_p = NULL;
    return 0;
}
EXPORT_SYMBOL(drm_put_minor);

static void drm_unplug_minor(struct drm_minor *minor)
{
    drm_sysfs_device_remove(minor);
}

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 = mtrr_del(dev->agp->agp_mtrr,
                  dev->agp->agp_info.aper_base,
                  dev->agp->agp_info.aper_size * 1024 * 1024);
        DRM_DEBUG("mtrr_del=%d\n", retval);
    }

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

    if (drm_core_has_AGP(dev) && dev->agp) {
        kfree(dev->agp);
        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);

    list_del(&dev->driver_item);
    if (dev->devname) {
        kfree(dev->devname);
        dev->devname = NULL;
    }
    kfree(dev);
}
EXPORT_SYMBOL(drm_put_dev);

void drm_unplug_dev(struct drm_device *dev)
{
    /* for a USB device */
    if (drm_core_check_feature(dev, DRIVER_MODESET))
        drm_unplug_minor(dev->control);
    drm_unplug_minor(dev->primary);

    mutex_lock(&drm_global_mutex);

    drm_device_set_unplugged(dev);

    if (dev->open_count == 0) {
        drm_put_dev(dev);
    }
    mutex_unlock(&drm_global_mutex);
}
EXPORT_SYMBOL(drm_unplug_dev);