diff options
Diffstat (limited to 'linux-core')
| -rw-r--r-- | linux-core/drmP.h | 1 | ||||
| -rw-r--r-- | linux-core/drm_context.c | 30 |
2 files changed, 31 insertions, 0 deletions
diff --git a/linux-core/drmP.h b/linux-core/drmP.h index 2b4dbcf6..8fed5e72 100644 --- a/linux-core/drmP.h +++ b/linux-core/drmP.h @@ -838,6 +838,7 @@ extern int drm_context_switch_complete(drm_device_t * dev, int new); extern int drm_ctxbitmap_init(drm_device_t * dev); extern void drm_ctxbitmap_cleanup(drm_device_t * dev); extern void drm_ctxbitmap_free(drm_device_t * dev, int ctx_handle); +extern int drm_check_context(drm_file_t *priv, drm_context_t handle); extern int drm_setsareactx(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg); diff --git a/linux-core/drm_context.c b/linux-core/drm_context.c index baa8437d..2f947191 100644 --- a/linux-core/drm_context.c +++ b/linux-core/drm_context.c @@ -576,4 +576,34 @@ int drm_rmctx(struct inode *inode, struct file *filp, return 0; } +/** + * Check that a context is registered for a caller. + * + * \param priv file pointer private structure. + * \param handle context handle. + * \param arg user argument pointing to a drm_ctx structure. + * \return one if the context is registered with the file pointer. Zero otherwise. + */ + +int drm_check_context(drm_file_t *priv, drm_context_t handle) +{ + drm_device_t *dev = priv->head->dev; + int ret = 0; + + down(&dev->ctxlist_sem); + if (dev->ctxlist && !list_empty(&dev->ctxlist->head)) { + drm_ctx_list_t *pos, *n; + + list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) { + if (pos->handle == handle) { + ret = (pos->tag == priv); + break; + } + } + } + up(&dev->ctxlist_sem); + return ret; +} + + /*@}*/ |