As we perform the mmio-flip without any locking and then try to acquire the struct_mutex prior to dereferencing the request, it is possible for userspace to queue a new pageflip before the worker can finish clearing the old state - and then it will clear the new flip request. The result is that the new flip could be completed before the GPU has finished rendering.
The bugs stems from removing the seqno checking in commit 536f5b5e86b225dab94c7ff8061ae482b6077387 Author: Ander Conselvan de Oliveira <ander.conselvan.de.olive...@intel.com> Date: Thu Nov 6 11:03:40 2014 +0200 drm/i915: Make mmio flip wait for seqno in the work function Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk> Cc: Ander Conselvan de Oliveira <ander.conselvan.de.olive...@intel.com> --- drivers/gpu/drm/i915/i915_drv.h | 6 ++++-- drivers/gpu/drm/i915/intel_display.c | 39 ++++++++++++++++++------------------ drivers/gpu/drm/i915/intel_drv.h | 4 ++-- 3 files changed, 25 insertions(+), 24 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index c9161c3d1e34..0a412eaf7a31 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2136,10 +2136,12 @@ i915_gem_request_get_ring(struct drm_i915_gem_request *req) return req ? req->ring : NULL; } -static inline void +static inline struct drm_i915_gem_request * i915_gem_request_reference(struct drm_i915_gem_request *req) { - kref_get(&req->ref); + if (req) + kref_get(&req->ref); + return req; } static inline void diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index e3399af8e0cd..2ca71eeaf2d7 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -10651,22 +10651,18 @@ static void intel_do_mmio_flip(struct intel_crtc *intel_crtc) static void intel_mmio_flip_work_func(struct work_struct *work) { - struct intel_crtc *crtc = - container_of(work, struct intel_crtc, mmio_flip.work); - struct intel_mmio_flip *mmio_flip; + struct intel_mmio_flip *mmio_flip = + container_of(work, struct intel_mmio_flip, work); - mmio_flip = &crtc->mmio_flip; - if (mmio_flip->req) - WARN_ON(__i915_wait_request(mmio_flip->req, - crtc->reset_counter, - false, NULL, NULL) != 0); + if (mmio_flip->rq) + WARN_ON(__i915_wait_request(mmio_flip->rq, + mmio_flip->crtc->reset_counter, + false, NULL, NULL)); - intel_do_mmio_flip(crtc); - if (mmio_flip->req) { - mutex_lock(&crtc->base.dev->struct_mutex); - i915_gem_request_assign(&mmio_flip->req, NULL); - mutex_unlock(&crtc->base.dev->struct_mutex); - } + intel_do_mmio_flip(mmio_flip->crtc); + + i915_gem_request_unreference__unlocked(mmio_flip->rq); + kfree(mmio_flip); } static int intel_queue_mmio_flip(struct drm_device *dev, @@ -10676,12 +10672,17 @@ static int intel_queue_mmio_flip(struct drm_device *dev, struct intel_engine_cs *ring, uint32_t flags) { - struct intel_crtc *intel_crtc = to_intel_crtc(crtc); + struct intel_mmio_flip *mmio_flip; + + mmio_flip = kmalloc(sizeof(*mmio_flip), GFP_KERNEL); + if (mmio_flip == NULL) + return -ENOMEM; - i915_gem_request_assign(&intel_crtc->mmio_flip.req, - obj->last_write_req); + mmio_flip->rq = i915_gem_request_reference(obj->last_write_req); + mmio_flip->crtc = to_intel_crtc(crtc); - schedule_work(&intel_crtc->mmio_flip.work); + INIT_WORK(&mmio_flip->work, intel_mmio_flip_work_func); + schedule_work(&mmio_flip->work); return 0; } @@ -13669,8 +13670,6 @@ static void intel_crtc_init(struct drm_device *dev, int pipe) dev_priv->plane_to_crtc_mapping[intel_crtc->plane] = &intel_crtc->base; dev_priv->pipe_to_crtc_mapping[intel_crtc->pipe] = &intel_crtc->base; - INIT_WORK(&intel_crtc->mmio_flip.work, intel_mmio_flip_work_func); - drm_crtc_helper_add(&intel_crtc->base, &intel_helper_funcs); WARN_ON(drm_crtc_index(&intel_crtc->base) != intel_crtc->pipe); diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 23a42a40abae..7f8cce797ba2 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -468,8 +468,9 @@ struct intel_pipe_wm { }; struct intel_mmio_flip { - struct drm_i915_gem_request *req; struct work_struct work; + struct drm_i915_gem_request *rq; + struct intel_crtc *crtc; }; struct skl_pipe_wm { @@ -554,7 +555,6 @@ struct intel_crtc { } wm; int scanline_offset; - struct intel_mmio_flip mmio_flip; struct intel_crtc_atomic_commit atomic; -- 2.1.4 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx