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[client/host/idd/obs] scheduler: validate phase feedback

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Bump KVMFR to version 28 and attach generation, epoch, and deadline
identities to cadence deliveries and their timing records.

Accept phase corrections only for the exact completed publication. Keep
VM and client clocks independent by exchanging relative phase errors.

Make submission, completion, and work-estimate accounting best effort
so scheduler state cannot delay GPU submission or frame publication.
This commit is contained in:
Geoffrey McRae
2026-08-06 16:05:05 +10:00
parent 983cf588e3
commit 515f4ba06f
16 changed files with 688 additions and 235 deletions
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63
client/transports/LGMP/lgmp.c
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@@ -721,6 +721,18 @@ static bool lgmp_frameSerialNewer(uint32_t lhs, uint32_t rhs)
(uint32_t)(lhs - rhs) < UINT32_C(0x80000000);
}
static bool lgmp_frameMessageHasMatchingDeadline(
const struct LGMPFrameMessage * message)
{
if (!message->owner)
return false;
const uint32_t epoch = (uint32_t)(message->message.udata >> 32);
const uint32_t deadlineSerial = (uint32_t)message->message.udata;
return deadlineSerial && epoch == message->frame->scheduleEpoch &&
deadlineSerial == message->frame->scheduleDeadlineSerial;
}
static void lgmp_selectNewestFrameMessage(
struct LGMPFrameMessage * candidate,
struct LGMPFrameMessage ** selected)
@@ -732,7 +744,9 @@ static void lgmp_selectNewestFrameMessage(
lgmp_frameSerialNewer(candidate->frame->frameSerial,
(*selected)->frame->frameSerial) ||
(candidate->frame->frameSerial == (*selected)->frame->frameSerial &&
candidate->owner && !(*selected)->owner))
((candidate->owner && !(*selected)->owner) ||
(lgmp_frameMessageHasMatchingDeadline(candidate) &&
!lgmp_frameMessageHasMatchingDeadline(*selected)))))
*selected = candidate;
}
@@ -917,9 +931,9 @@ static LG_TransportStatus lgmp_nextFrameLocked(LG_Transport * this,
if (selected->owner)
{
const uint64_t scheduleToken = selected->message.udata;
result->scheduleGeneration = (uint32_t)(scheduleToken >> 32);
result->scheduleEpoch = (uint32_t)scheduleToken;
result->scheduleOwner = true;
result->scheduleEpoch = (uint32_t)(scheduleToken >> 32);
result->scheduleDeadlineSerial = (uint32_t)scheduleToken;
result->scheduleOwner = true;
}
if (frame->flags & FRAME_FLAG_BLOCK_SCREENSAVER)
result->flags |= LG_TRANSPORT_FRAME_BLOCK_SCREENSAVER;
@@ -1057,11 +1071,20 @@ static void lgmp_getFrameTiming(LG_Transport * this,
return;
}
timing->valid = true;
timing->captureTime = lease->frame->captureTime;
timing->postProcessTime = lease->frame->postProcessTime;
timing->copyTime = lease->frame->copyTime;
timing->readyTime = lease->frame->readyTime;
timing->valid = true;
timing->scheduleGeneration = lease->frame->scheduleGeneration;
timing->scheduleEpoch = lease->frame->scheduleEpoch;
timing->scheduleDeadlineSerial = lease->frame->scheduleDeadlineSerial;
timing->phaseValid = frame->scheduleOwner &&
timing->scheduleGeneration && timing->scheduleEpoch &&
timing->scheduleDeadlineSerial &&
timing->scheduleEpoch == frame->scheduleEpoch &&
timing->scheduleDeadlineSerial == frame->scheduleDeadlineSerial &&
(lease->frame->timingFlags & KVMFR_FRAME_TIMING_PHASE_VALID);
timing->captureTime = lease->frame->captureTime;
timing->postProcessTime = lease->frame->postProcessTime;
timing->copyTime = lease->frame->copyTime;
timing->readyTime = lease->frame->readyTime;
LG_UNLOCK(this->frameLock);
}
@@ -1244,17 +1267,19 @@ static LG_TransportStatus lgmp_sendControl(LG_Transport * this,
case LG_TRANSPORT_CONTROL_FRAME_SCHEDULE:
{
const KVMFRFrameSchedule message = {
.msg.type = KVMFR_MESSAGE_FRAME_SCHEDULE,
.clientID = this->clientID,
.generation = control->frameSchedule.generation,
.flags = control->frameSchedule.flags,
.period = control->frameSchedule.period,
.targetSlack = control->frameSchedule.targetSlack,
.phaseError = control->frameSchedule.phaseError,
.feedbackFrameSerial = control->frameSchedule.feedbackFrameSerial,
.feedbackScheduleEpoch =
.msg.type = KVMFR_MESSAGE_FRAME_SCHEDULE,
.clientID = this->clientID,
.generation = control->frameSchedule.generation,
.flags = control->frameSchedule.flags,
.period = control->frameSchedule.period,
.targetSlack = control->frameSchedule.targetSlack,
.phaseError = control->frameSchedule.phaseError,
.feedbackFrameSerial = control->frameSchedule.feedbackFrameSerial,
.feedbackScheduleEpoch =
control->frameSchedule.feedbackScheduleEpoch,
.lease = control->frameSchedule.lease,
.feedbackDeadlineSerial =
control->frameSchedule.feedbackDeadlineSerial,
.lease = control->frameSchedule.lease,
};
memcpy(buffer, &message, sizeof(message));
size = sizeof(message);