From e444de56bc60ce0a388e328bcf86dcd0baabc32e Mon Sep 17 00:00:00 2001 From: Alexandre Courbot Date: Thu, 19 Jan 2017 12:11:15 +0900 Subject: [PATCH] drm/nouveau/falcon: protect against concurrent DMEM accesses The falcon library may be used concurrently, especially after the introduction of the msgqueue interface. Make it safe to use it that way. Signed-off-by: Alexandre Courbot Signed-off-by: Ben Skeggs --- drivers/gpu/drm/nouveau/include/nvkm/engine/falcon.h | 1 + drivers/gpu/drm/nouveau/nvkm/falcon/base.c | 9 +++++++++ 2 files changed, 10 insertions(+) diff --git a/drivers/gpu/drm/nouveau/include/nvkm/engine/falcon.h b/drivers/gpu/drm/nouveau/include/nvkm/engine/falcon.h index 7e498e65b1e8..9384dff81494 100644 --- a/drivers/gpu/drm/nouveau/include/nvkm/engine/falcon.h +++ b/drivers/gpu/drm/nouveau/include/nvkm/engine/falcon.h @@ -19,6 +19,7 @@ struct nvkm_falcon { u32 addr; struct mutex mutex; + struct mutex dmem_mutex; const struct nvkm_subdev *user; u8 version; diff --git a/drivers/gpu/drm/nouveau/nvkm/falcon/base.c b/drivers/gpu/drm/nouveau/nvkm/falcon/base.c index 4852f313762f..ee25fdc21e1f 100644 --- a/drivers/gpu/drm/nouveau/nvkm/falcon/base.c +++ b/drivers/gpu/drm/nouveau/nvkm/falcon/base.c @@ -41,14 +41,22 @@ void nvkm_falcon_load_dmem(struct nvkm_falcon *falcon, void *data, u32 start, u32 size, u8 port) { + mutex_lock(&falcon->dmem_mutex); + falcon->func->load_dmem(falcon, data, start, size, port); + + mutex_unlock(&falcon->dmem_mutex); } void nvkm_falcon_read_dmem(struct nvkm_falcon *falcon, u32 start, u32 size, u8 port, void *data) { + mutex_lock(&falcon->dmem_mutex); + falcon->func->read_dmem(falcon, start, size, port, data); + + mutex_unlock(&falcon->dmem_mutex); } void @@ -166,6 +174,7 @@ nvkm_falcon_ctor(const struct nvkm_falcon_func *func, falcon->name = name; falcon->addr = addr; mutex_init(&falcon->mutex); + mutex_init(&falcon->dmem_mutex); reg = nvkm_falcon_rd32(falcon, 0x12c); falcon->version = reg & 0xf; -- 2.20.1