diff options
| author |   Mika Kuoppala <mika.kuoppala@linux.intel.com> | 2020-04-25 02:05:46 +0300 |
|---|---|---|
| committer |   Chris Wilson <chris@chris-wilson.co.uk> | 2020-04-25 18:39:32 +0100 |
| commit | 685d21096f6ceb44bda186dd42520f2a9d21d1aa (patch) | |
| tree | 5d3e30bb8a1b07b4d62c8caaee49ee1953f2bfa5 /drivers/gpu/drm/i915/gt/intel_context_types.h | |
| parent | drm/i915: Add engine scratch register to live_lrc_fixed (diff) | |
| download | linux-dev-685d21096f6ceb44bda186dd42520f2a9d21d1aa.tar.xz linux-dev-685d21096f6ceb44bda186dd42520f2a9d21d1aa.zip | |
drm/i915: Add per ctx batchbuffer wa for timestamp
Restoration of a previous timestamp can collide
with updating the timestamp, causing a value corruption.
Combat this issue by using indirect ctx bb to
modify the context image during restoring process.
We can preload value into scratch register. From which
we then do the actual write with LRR. LRR is faster and
thus less error prone as probability of race drops.
v2: tidying (Chris)
v3: lrr for all engines
v4: grp
v5: reg bit
v6: wa_bb_offset, virtual engines (Chris)
References: HSDES#16010904313
Testcase: igt/i915_selftest/gt_lrc
Suggested-by: Joseph Koston <joseph.koston@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200424230546.30271-1-mika.kuoppala@linux.intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_context_types.h')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_context_types.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h index 07cb83a0d017..e0da7bdcbf01 100644 --- a/drivers/gpu/drm/i915/gt/intel_context_types.h +++ b/drivers/gpu/drm/i915/gt/intel_context_types.h @@ -96,6 +96,8 @@ struct intel_context { /** sseu: Control eu/slice partitioning */ struct intel_sseu sseu; + + u8 wa_bb_page; /* if set, page num reserved for context workarounds */ }; #endif /* __INTEL_CONTEXT_TYPES__ */ |