3.2-stable review patch. If anyone has any objections, please let me know.
------------------ From: Chris Wilson <ch...@chris-wilson.co.uk> commit 7dd4906586274f3945f2aeaaa5a33b451c3b4bba upstream. The BLT commands on gen2/3 utilize the fence registers and so we cannot modify any fences for the object whilst those commands are in flight. Currently we marked tiled commands as occupying a fence, but forgot to restrict the untiled commands from preventing a fence being assigned before they were completed. One side-effect is that we ten have to double check that a fence was allocated for a fenced buffer during move-to-active. Reported-by: Jiri Slaby <jirisl...@gmail.com> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=43427 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=47990 Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch> Testcase: i-g-t/tests/gem_tiled_after_untiled_blt Tested-by: Daniel Vetter <daniel.vet...@ffwll.ch> Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch> [bwh: Backported to 3.2: The nesting of if-statements in the old i915_gem_execbuffer_reserve() differs from pin_and_fence_object(), so don't move the assignment of obj->pending_fenced_gpu_access but adjust the boolean expression as recommended by Daniel Vetter.] Signed-off-by: Ben Hutchings <b...@decadent.org.uk> --- drivers/gpu/drm/i915/i915_gem.c | 15 +++++++++------ drivers/gpu/drm/i915/i915_gem_execbuffer.c | 2 +- 2 files changed, 10 insertions(+), 7 deletions(-) --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1543,16 +1543,19 @@ i915_gem_object_move_to_active(struct dr list_move_tail(&obj->ring_list, &ring->active_list); obj->last_rendering_seqno = seqno; - if (obj->fenced_gpu_access) { - struct drm_i915_fence_reg *reg; - - BUG_ON(obj->fence_reg == I915_FENCE_REG_NONE); + if (obj->fenced_gpu_access) { obj->last_fenced_seqno = seqno; obj->last_fenced_ring = ring; - reg = &dev_priv->fence_regs[obj->fence_reg]; - list_move_tail(®->lru_list, &dev_priv->mm.fence_list); + /* Bump MRU to take account of the delayed flush */ + if (obj->fence_reg != I915_FENCE_REG_NONE) { + struct drm_i915_fence_reg *reg; + + reg = &dev_priv->fence_regs[obj->fence_reg]; + list_move_tail(®->lru_list, + &dev_priv->mm.fence_list); + } } } --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -574,7 +574,8 @@ i915_gem_execbuffer_reserve(struct intel if (ret) break; } - obj->pending_fenced_gpu_access = need_fence; + obj->pending_fenced_gpu_access = + !!(entry->flags & EXEC_OBJECT_NEEDS_FENCE); } entry->offset = obj->gtt_offset; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
