From 5332737432ad5989830dae75df0d3e9cce56e893 Mon Sep 17 00:00:00 2001 From: Tobias Jakobi Date: Tue, 27 Sep 2016 17:50:08 +0200 Subject: [PATCH] drm/exynos: g2d: remove runqueue nodes in g2d_{close,remove}() The driver might be closed (and/or removed) while there are still nodes queued for processing. Make sure to remove these nodes, which means all of them in the case of g2d_remove() and only those belonging to the corresponding process in g2d_close(). Signed-off-by: Tobias Jakobi Acked-by: Marek Szyprowski Signed-off-by: Inki Dae --- drivers/gpu/drm/exynos/exynos_drm_g2d.c | 48 ++++++++++++++++++++++----------- 1 file changed, 33 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c index 7252fae..0f84e7b 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c @@ -855,11 +855,27 @@ static void g2d_free_runqueue_node(struct g2d_data *g2d, kmem_cache_free(g2d->runqueue_slab, runqueue_node); } -static void g2d_exec_runqueue(struct g2d_data *g2d) +/** + * g2d_remove_runqueue_nodes - remove items from the list of runqueue nodes + * @g2d: G2D state object + * @file: if not zero, only remove items with this DRM file + * + * Has to be called under runqueue lock. + */ +static void g2d_remove_runqueue_nodes(struct g2d_data *g2d, struct drm_file* file) { - g2d->runqueue_node = g2d_get_runqueue_node(g2d); - if (g2d->runqueue_node) - g2d_dma_start(g2d, g2d->runqueue_node); + struct g2d_runqueue_node *node, *n; + + if (list_empty(&g2d->runqueue)) + return; + + list_for_each_entry_safe(node, n, &g2d->runqueue, list) { + if (file && node->filp != file) + continue; + + list_del_init(&node->list); + g2d_free_runqueue_node(g2d, node); + } } static void g2d_runqueue_worker(struct work_struct *work) @@ -1369,15 +1385,19 @@ static void g2d_close(struct drm_device *drm_dev, struct device *dev, if (!g2d) return; + /* Remove the runqueue nodes that belong to us. */ + mutex_lock(&g2d->runqueue_mutex); + g2d_remove_runqueue_nodes(g2d, file); + mutex_unlock(&g2d->runqueue_mutex); + + /* + * Even after the engine is idle, there might still be stale cmdlists + * (i.e. cmdlisst which we submitted but never executed) around, with + * their corresponding GEM/userptr buffers. + * Properly unmap these buffers here. + */ mutex_lock(&g2d->cmdlist_mutex); list_for_each_entry_safe(node, n, &g2d_priv->inuse_cmdlist, list) { - /* - * unmap all gem objects not completed. - * - * P.S. if current process was terminated forcely then - * there may be some commands in inuse_cmdlist so unmap - * them. - */ g2d_unmap_cmdlist_gem(g2d, node, file); list_move_tail(&node->list, &g2d->free_cmdlist); } @@ -1496,10 +1516,8 @@ static int g2d_remove(struct platform_device *pdev) cancel_work_sync(&g2d->runqueue_work); exynos_drm_subdrv_unregister(&g2d->subdrv); - while (g2d->runqueue_node) { - g2d_free_runqueue_node(g2d, g2d->runqueue_node); - g2d->runqueue_node = g2d_get_runqueue_node(g2d); - } + /* There should be no locking needed here. */ + g2d_remove_runqueue_nodes(g2d, NULL); pm_runtime_disable(&pdev->dev); -- 2.7.4