On 14/09/2021 20:31, Thomas Hellström wrote:
Pinned contexts, like the migrate contexts need reset after resume
since their context image may have been lost. Also the GuC needs to
register pinned contexts.
Add a list to struct intel_engine_cs where we add all pinned contexts on
creation, and traverse that list at resume time to reset the pinned
contexts.
This fixes the kms_pipe_crc_basic@suspend-read-crc-pipe-a selftest for now,
but proper LMEM backup / restore is needed for full suspend functionality.
However, note that even with full LMEM backup / restore it may be
desirable to keep the reset since backing up the migrate context images
must happen using memcpy() after the migrate context has become inactive,
and for performance- and other reasons we want to avoid memcpy() from
LMEM.
Also traverse the list at guc_init_lrc_mapping() calling
guc_kernel_context_pin() for the pinned contexts, like is already done
for the kernel context.
v2:
- Don't reset the contexts on each __engine_unpark() but rather at
resume time (Chris Wilson).
v3:
- Reset contexts in the engine sanitize callback. (Chris Wilson)
Cc: Tvrtko Ursulin <tvrtko.ursu...@linux.intel.com>
Cc: Matthew Auld <matthew.a...@intel.com>
Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Cc: Brost Matthew <matthew.br...@intel.com>
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
Signed-off-by: Thomas Hellström <thomas.hellst...@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.a...@intel.com>
