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drm/xe: Don't process TLB invalidation done in CT fast-path

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We can't currently do this due to TLB invalidation done handler
expecting the seqno being received in-order, with the fast-path a TLB
invalidation done could pass one being processed in the slow-path in an
extreme corner case. Remove TLB invalidation done from the fast-path for
now and in a follow up reenable this once the TLB invalidation done
handler can deal with out of order seqno.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Matthew Brost 2023-01-20 09:17:50 -08:00 committed by Rodrigo Vivi
parent e89b384cde
commit 5b64366087
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/xe/xe_guc_ct.c
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@ -966,7 +966,14 @@ static int g2h_read(struct xe_guc_ct *ct, u32 *msg, bool fast_path)
return 0;
switch (FIELD_GET(GUC_HXG_EVENT_MSG_0_ACTION, msg[1])) {
case XE_GUC_ACTION_TLB_INVALIDATION_DONE:
/*
* FIXME: We really should process
* XE_GUC_ACTION_TLB_INVALIDATION_DONE here in the fast-path as
* these critical for page fault performance. We currently can't
* due to TLB invalidation done algorithm expecting the seqno
* returned in-order. With some small changes to the algorithm
* and locking we should be able to support out-of-order seqno.
*/
case XE_GUC_ACTION_REPORT_PAGE_FAULT_REQ_DESC:
break; /* Process these in fast-path */
default: