From: John Harrison Date: Fri, 29 May 2015 16:43:25 +0000 (+0100) Subject: drm/i915: Early alloc request in execbuff X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0c8dac889539ab26382ba1636ec1159cae73f2b3;p=linux-beck.git drm/i915: Early alloc request in execbuff Start of explicit request management in the execbuffer code path. This patch adds a call to allocate a request structure before all the actual hardware work is done. Thus guaranteeing that all that work is tagged by a known request. At present, nothing further is done with the request, the rest comes later in the series. The only noticable change is that failure to get a request (e.g. due to lack of memory) will be caught earlier in the sequence. It now occurs right at the start before any un-undoable work has been done. v2: Simplified the error handling path. For: VIZ-5115 Signed-off-by: John Harrison Reviewed-by: Tomas Elf Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index 8ebc10d0527d..2e41f7281c84 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -1611,10 +1611,16 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, } else exec_start += i915_gem_obj_offset(batch_obj, vm); + /* Allocate a request for this batch buffer nice and early. */ + ret = i915_gem_request_alloc(ring, ctx); + if (ret) + goto err_batch_unpin; + ret = dev_priv->gt.execbuf_submit(dev, file, ring, ctx, args, &eb->vmas, batch_obj, exec_start, dispatch_flags); +err_batch_unpin: /* * FIXME: We crucially rely upon the active tracking for the (ppgtt) * batch vma for correctness. For less ugly and less fragility this @@ -1623,6 +1629,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, */ if (dispatch_flags & I915_DISPATCH_SECURE) i915_gem_object_ggtt_unpin(batch_obj); + err: /* the request owns the ref now */ i915_gem_context_unreference(ctx);