On Wed, 2015-08-05 at 09:30 +0000, Chris Wilson wrote: > On Wed, Aug 05, 2015 at 11:25:40AM +0530, [email protected] wrote: > > From: Sourab Gupta <[email protected]> > > > > This patch adds the routines through which one can insert commands in the > > ringbuf for capturing timestamps, which are used to insert these commands > > around the batchbuffer. > > > > While inserting the commands, we keep a reference of associated request. > > This will be released when we are forwarding the samples to userspace > > (or when the event is being destroyed). > > Also, an active reference of the destination buffer is taken here, so that > > we can be assured that the buffer is freed up only after GPU is done with > > it, even if the local reference of the buffer is released. > > > > v2: Changes (as suggested by Chris): > > - Passing in 'request' struct for emit report function > > - Removed multiple calls to i915_gem_obj_to_ggtt(). Keeping hold of > > pinned vma from start and using when required. > > - Better nomenclature, and error handling. > > > > @@ -919,6 +993,7 @@ static int init_gen_pmu_buffer(struct perf_event *event) > > dev_priv->gen_pmu.buffer.obj = bo; > > dev_priv->gen_pmu.buffer.gtt_offset = > > i915_gem_obj_ggtt_offset(bo); > > + dev_priv->gen_pmu.buffer.vma = i915_gem_obj_to_ggtt(bo); > > dev_priv->gen_pmu.buffer.addr = vmap_oa_buffer(bo); > > INIT_LIST_HEAD(&dev_priv->gen_pmu.node_list); > > Still calling i915_gem_obj_to_ggtt(bo) twice! With pmu_buffer.vma you > can drop pmu_buffer.gtt_offset and never be confused again. > -Chris > Sorry, I'll have the one pertaining to gtt offset removed, and derive the gtt offset field from the vma only.
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