From cf913e9683273f2640501094fa63a67e29f437b3 Mon Sep 17 00:00:00 2001 From: Jernej Skrabec Date: Sun, 26 Jan 2020 07:59:37 +0100 Subject: [PATCH 1/3] Revert "drm/sun4i: drv: Allow framebuffer modifiers in mode config" This reverts commit 9db9c0cf5895e4ddde2814360cae7bea9282edd2. Setting mode_config.allow_fb_modifiers manually is completely unnecessary. It is set automatically by drm_universal_plane_init() based on the fact if modifier list is provided or not. Even more, it breaks DE2 and DE3 as they don't support any modifiers beside linear. Modifiers aware applications can be confused by provided empty modifier list - at least linear modifier should be included, but it's not for DE2 and DE3. Fixes: 9db9c0cf5895 ("drm/sun4i: drv: Allow framebuffer modifiers in mode config") Signed-off-by: Jernej Skrabec Reviewed-by: Paul Kocialkowski Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/20200126065937.9564-1-jernej.skrabec@siol.net --- drivers/gpu/drm/sun4i/sun4i_drv.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c index a5757b11b730..5b54eff12cc0 100644 --- a/drivers/gpu/drm/sun4i/sun4i_drv.c +++ b/drivers/gpu/drm/sun4i/sun4i_drv.c @@ -85,7 +85,6 @@ static int sun4i_drv_bind(struct device *dev) } drm_mode_config_init(drm); - drm->mode_config.allow_fb_modifiers = true; ret = component_bind_all(drm->dev, drm); if (ret) { From 8ccb5bf7619c6523e7a4384a84b72e7be804298c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jos=C3=A9=20Roberto=20de=20Souza?= Date: Wed, 29 Jan 2020 15:24:48 -0800 Subject: [PATCH 2/3] drm/mst: Fix possible NULL pointer dereference in drm_dp_mst_process_up_req() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit According to DP specification, DP_SINK_EVENT_NOTIFY is also a broadcast message but as this function only handles DP_CONNECTION_STATUS_NOTIFY I will only make the static analyzer that caught this issue happy by not calling drm_dp_get_mst_branch_device_by_guid() with a NULL guid, causing drm_dp_mst_process_up_req() to return in the "if (!mstb)" right bellow. Fixes: 9408cc94eb04 ("drm/dp_mst: Handle UP requests asynchronously") Cc: Lyude Paul Cc: Sean Paul Cc: # v5.5+ Signed-off-by: José Roberto de Souza [added cc to stable] Signed-off-by: Lyude Paul Link: https://patchwork.freedesktop.org/patch/msgid/20200129232448.84704-1-jose.souza@intel.com --- drivers/gpu/drm/drm_dp_mst_topology.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index e6afe4faeca6..105bb5f40166 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -3760,7 +3760,8 @@ drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr *mgr, else if (msg->req_type == DP_RESOURCE_STATUS_NOTIFY) guid = msg->u.resource_stat.guid; - mstb = drm_dp_get_mst_branch_device_by_guid(mgr, guid); + if (guid) + mstb = drm_dp_get_mst_branch_device_by_guid(mgr, guid); } else { mstb = drm_dp_get_mst_branch_device(mgr, hdr->lct, hdr->rad); } From 7e0cf7e9936c4358b0863357b90aa12afe6489da Mon Sep 17 00:00:00 2001 From: Boris Brezillon Date: Fri, 29 Nov 2019 14:59:08 +0100 Subject: [PATCH 3/3] drm/panfrost: Make sure the shrinker does not reclaim referenced BOs Userspace might tag a BO purgeable while it's still referenced by GPU jobs. We need to make sure the shrinker does not purge such BOs until all jobs referencing it are finished. Fixes: 013b65101315 ("drm/panfrost: Add madvise and shrinker support") Cc: Signed-off-by: Boris Brezillon Reviewed-by: Steven Price Signed-off-by: Rob Herring Link: https://patchwork.freedesktop.org/patch/msgid/20191129135908.2439529-9-boris.brezillon@collabora.com --- drivers/gpu/drm/panfrost/panfrost_drv.c | 1 + drivers/gpu/drm/panfrost/panfrost_gem.h | 6 ++++++ drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c | 3 +++ drivers/gpu/drm/panfrost/panfrost_job.c | 7 ++++++- 4 files changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c index 88b431a267af..273d67e251c2 100644 --- a/drivers/gpu/drm/panfrost/panfrost_drv.c +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c @@ -166,6 +166,7 @@ panfrost_lookup_bos(struct drm_device *dev, break; } + atomic_inc(&bo->gpu_usecount); job->mappings[i] = mapping; } diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.h b/drivers/gpu/drm/panfrost/panfrost_gem.h index ca1bc9019600..b3517ff9630c 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gem.h +++ b/drivers/gpu/drm/panfrost/panfrost_gem.h @@ -30,6 +30,12 @@ struct panfrost_gem_object { struct mutex lock; } mappings; + /* + * Count the number of jobs referencing this BO so we don't let the + * shrinker reclaim this object prematurely. + */ + atomic_t gpu_usecount; + bool noexec :1; bool is_heap :1; }; diff --git a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c index f5dd7b29bc95..288e46c40673 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c +++ b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c @@ -41,6 +41,9 @@ static bool panfrost_gem_purge(struct drm_gem_object *obj) struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); struct panfrost_gem_object *bo = to_panfrost_bo(obj); + if (atomic_read(&bo->gpu_usecount)) + return false; + if (!mutex_trylock(&shmem->pages_lock)) return false; diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c index e364ee00f3d0..4d383831c1fc 100644 --- a/drivers/gpu/drm/panfrost/panfrost_job.c +++ b/drivers/gpu/drm/panfrost/panfrost_job.c @@ -269,8 +269,13 @@ static void panfrost_job_cleanup(struct kref *ref) dma_fence_put(job->render_done_fence); if (job->mappings) { - for (i = 0; i < job->bo_count; i++) + for (i = 0; i < job->bo_count; i++) { + if (!job->mappings[i]) + break; + + atomic_dec(&job->mappings[i]->obj->gpu_usecount); panfrost_gem_mapping_put(job->mappings[i]); + } kvfree(job->mappings); }