diff options
Diffstat (limited to 'drivers/gpu/drm/drm_auth.c')
| -rw-r--r-- | drivers/gpu/drm/drm_auth.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c index 50d0baa06db0..1d314ae13560 100644 --- a/drivers/gpu/drm/drm_auth.c +++ b/drivers/gpu/drm/drm_auth.c @@ -30,6 +30,7 @@ #include <drm/drmP.h> #include "drm_internal.h" +#include "drm_legacy.h" /** * drm_getmagic - Get unique magic of a client @@ -91,3 +92,165 @@ int drm_authmagic(struct drm_device *dev, void *data, return file ? 0 : -EINVAL; } + +static struct drm_master *drm_master_create(struct drm_device *dev) +{ + 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); + idr_init(&master->magic_map); + master->dev = dev; + + return master; +} + +/* + * drm_new_set_master - Allocate a new master object and become master for the + * associated master realm. + * + * @dev: The associated device. + * @fpriv: File private identifying the client. + * + * This function must be called with dev::struct_mutex held. + * Returns negative error code on failure. Zero on success. + */ +int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv) +{ + struct drm_master *old_master; + int ret; + + lockdep_assert_held_once(&dev->master_mutex); + + /* create a new master */ + fpriv->minor->master = drm_master_create(fpriv->minor->dev); + if (!fpriv->minor->master) + return -ENOMEM; + + /* take another reference for the copy in the local file priv */ + old_master = fpriv->master; + fpriv->master = drm_master_get(fpriv->minor->master); + + if (dev->driver->master_create) { + ret = dev->driver->master_create(dev, fpriv->master); + if (ret) + goto out_err; + } + if (dev->driver->master_set) { + ret = dev->driver->master_set(dev, fpriv, true); + if (ret) + goto out_err; + } + + fpriv->is_master = 1; + fpriv->allowed_master = 1; + fpriv->authenticated = 1; + if (old_master) + drm_master_put(&old_master); + + return 0; + +out_err: + /* drop both references and restore old master on failure */ + drm_master_put(&fpriv->minor->master); + drm_master_put(&fpriv->master); + fpriv->master = old_master; + + return ret; +} + +int drm_setmaster_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + int ret = 0; + + mutex_lock(&dev->master_mutex); + if (file_priv->is_master) + goto out_unlock; + + if (file_priv->minor->master) { + ret = -EINVAL; + goto out_unlock; + } + + if (!file_priv->master) { + ret = -EINVAL; + goto out_unlock; + } + + if (!file_priv->allowed_master) { + ret = drm_new_set_master(dev, file_priv); + goto out_unlock; + } + + 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); + } + } + +out_unlock: + mutex_unlock(&dev->master_mutex); + return ret; +} + +int drm_dropmaster_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + int ret = -EINVAL; + + mutex_lock(&dev->master_mutex); + if (!file_priv->is_master) + goto out_unlock; + + if (!file_priv->minor->master) + goto out_unlock; + + ret = 0; + 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; + +out_unlock: + mutex_unlock(&dev->master_mutex); + return ret; +} + +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_device *dev = master->dev; + + if (dev->driver->master_destroy) + dev->driver->master_destroy(dev, master); + + drm_legacy_master_rmmaps(dev, master); + + idr_destroy(&master->magic_map); + kfree(master->unique); + kfree(master); +} + +void drm_master_put(struct drm_master **master) +{ + kref_put(&(*master)->refcount, drm_master_destroy); + *master = NULL; +} +EXPORT_SYMBOL(drm_master_put); |