On Fri, Feb 15, 2013 at 04:12:16PM +0200, Mika Kuoppala wrote:
> Ville Syrjälä <ville.syrj...@linux.intel.com> writes:
>
> > On Mon, Feb 04, 2013 at 04:04:43PM +0200, Mika Kuoppala wrote:
> >> After hang check timer has declared gpu to be hang,
> >> rings are reset. In ring reset, when clearing
> >> request list, do post mortem analysis to find out
> >> the guilty batch buffer.
> >>
> >> Select requests for further analysis by inspecting
> >> the completed sequence number which has been updated
> >> into the HWS page. If request was completed, it can't
> >> be related to the hang.
> >>
> >> For completed requests mark the batch as guilty
> > ^^^^^^^^^
> >
> > That's a typo, right?
>
> It sure is. Will fix.
>
> >> if the ring was not waiting and the ring head was
> >> stuck inside the buffer object or in the flush region
> >> right after the batch. For everything else, mark
> >> them as innocents.
> >>
> >> Signed-off-by: Mika Kuoppala <mika.kuopp...@intel.com>
> >> ---
> >> drivers/gpu/drm/i915/i915_gem.c | 91
> >> +++++++++++++++++++++++++++++++++++++++
> >> 1 file changed, 91 insertions(+)
> >>
> >> diff --git a/drivers/gpu/drm/i915/i915_gem.c
> >> b/drivers/gpu/drm/i915/i915_gem.c
> >> index b304b06..db0f3e3 100644
> >> --- a/drivers/gpu/drm/i915/i915_gem.c
> >> +++ b/drivers/gpu/drm/i915/i915_gem.c
> >> @@ -2092,9 +2092,97 @@ i915_gem_request_remove_from_client(struct
> >> drm_i915_gem_request *request)
> >> spin_unlock(&file_priv->mm.lock);
> >> }
> >>
> >> +static bool i915_head_inside_object(u32 acthd, struct drm_i915_gem_object
> >> *obj)
> >> +{
> >> + if (acthd >= obj->gtt_offset &&
> >> + acthd < obj->gtt_offset + obj->base.size)
> >> + return true;
> >> +
> >> + return false;
> >> +}
> >> +
> >> +static bool i915_head_inside_request(u32 acthd, u32 rs, u32 re)
> >> +{
> >> + if (rs < re) {
> >> + if (acthd >= rs && acthd < re)
> >> + return true;
> >> + } else if (rs > re) {
> >> + if (acthd >= rs || acthd < re)
> >> + return true;
> >> + }
> >> +
> >> + return false;
> >> +}
> >> +
> >> +static bool i915_request_guilty(struct drm_i915_gem_request *request,
> >> + const u32 acthd, bool *inside)
> >> +{
> >> + if (request->batch_obj) {
> >> + if (i915_head_inside_object(acthd, request->batch_obj)) {
> >> + *inside = true;
> >> + return true;
> >> + }
> >> + }
> >> +
> >> + if (i915_head_inside_request(acthd, request->head, request->tail)) {
> >> + *inside = false;
> >> + return true;
> >> + }
> >> +
> >> + return false;
> >> +}
> >> +
> >> +static void i915_set_reset_status(struct intel_ring_buffer *ring,
> >> + struct drm_i915_gem_request *request,
> >> + u32 acthd)
> >> +{
> >> + bool inside;
> >> + struct i915_reset_stats *rs = NULL;
> >> + bool guilty;
> >> +
> >> + /* Innocent until proven guilty */
> >> + guilty = false;
> >> +
> >> + if (!ring->hangcheck_waiting &&
> >> + i915_request_guilty(request, acthd, &inside)) {
> >> + DRM_ERROR("%s hung %s bo (0x%x ctx %d) at 0x%x\n",
> >> + ring->name,
> >> + inside ? "inside" : "flushing",
> >> + request->batch_obj ?
> >> + request->batch_obj->gtt_offset : 0,
> >> + request->ctx ? request->ctx->id : 0,
> >> + acthd);
> >> +
> >> + guilty = true;
> >> + }
> >> +
> >> + /* If contexts are disabled or this is the default context, use
> >> + * file_priv->reset_stats
> >> + */
> >> + if (request->ctx && request->ctx->id != DEFAULT_CONTEXT_ID)
> >> + rs = &request->ctx->reset_stats;
> >> + else if (request->file_priv)
> >> + rs = &request->file_priv->reset_stats;
> >> +
> >> + if (rs) {
> >> + rs->total++;
> >> +
> >> + if (guilty)
> >> + rs->guilty++;
> >> + else
> >> + rs->innocent++;
> >> + }
> >> +}
> >> +
> >> static void i915_gem_reset_ring_lists(struct drm_i915_private *dev_priv,
> >> struct intel_ring_buffer *ring)
> >> {
> >> + u32 completed_seqno;
> >> + u32 acthd;
> >> +
> >> + acthd = intel_ring_get_active_head(ring);
> >> + completed_seqno = ring->get_seqno(ring, false);
> >> +
> >> while (!list_empty(&ring->request_list)) {
> >> struct drm_i915_gem_request *request;
> >>
> >> @@ -2102,6 +2190,9 @@ static void i915_gem_reset_ring_lists(struct
> >> drm_i915_private *dev_priv,
> >> struct drm_i915_gem_request,
> >> list);
> >>
> >> + if (request->seqno > completed_seqno)
> >
> > i915_seqno_passed()?
>
> For readability or for correctness?
>
> When seqno wraps, the request queue will be cleaned up so
> we can't have cross wrap boundary stuff in here.
>
> Or did you have something else in mind that i have missed.
Nah. It just seems suspicious to have a direct comparison with any
comment why i915_seqno_passed() isn't used.
--
Ville Syrjälä
Intel OTC
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