[v2,0/2] Fix error propagation amongst requests

Message

Andi Shyti Feb. 27, 2023, 9:08 p.m. UTC

Hi,

This series of two patches fixes the issue introduced in
cf586021642d80 ("drm/i915/gt: Pipelined page migration") where,
as reported by Matt, in a chain of requests an error is reported
only if happens in the last request.

However Chris noticed that without ensuring exclusivity in the
locking we might end up in some deadlock. That's why patch 1
throttles for the ringspace in order to make sure that no one is
holding it.

Version 1 of this patch has been reviewed by matt and this
version is adding Chris exclusive locking.

Thanks Chris for this work.

Andi

Changelog
=========
v1 -> v2
 - Add patch 1 for ensuring exclusive locking of the timeline
 - Reword git commit of patch 2.

Andi Shyti (1):
  drm/i915/gt: Make sure that errors are propagated through request
    chains

Chris Wilson (1):
  drm/i915: Throttle for ringspace prior to taking the timeline mutex

 drivers/gpu/drm/i915/gt/intel_context.c | 41 +++++++++++++++++++++++++
 drivers/gpu/drm/i915/gt/intel_context.h |  2 ++
 drivers/gpu/drm/i915/gt/intel_migrate.c | 31 +++++++++++++------
 drivers/gpu/drm/i915/i915_request.c     |  3 ++
 4 files changed, 67 insertions(+), 10 deletions(-)