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[idd] recovery: restore fallback display

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Add a protocol-independent recovery channel outside LGMP so clients can
request a usable guest display even when transport versions differ.

Synchronize recovery state with the helper across driver restarts and
restore the configured topology without persisting temporary changes.
This commit is contained in:
Geoffrey McRae
2026-08-11 23:31:11 +10:00
parent 9898e9bcec
commit bacf376305
18 changed files with 1290 additions and 57 deletions
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134
idd/LGIdd/display/CDeviceContext.cpp
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@@ -44,8 +44,14 @@ CDeviceContext::CDeviceContext(WDFDEVICE wdfDevice) :
CDeviceContext::~CDeviceContext()
{
// Both callbacks dereference this context. Drain them before the subsystem
// These callbacks dereference this context. Drain them before the subsystem
// members are destroyed in frame, control, host order.
if (m_recoveryHandlerSet)
{
g_pipe.ClearRecoveryHandler(this);
m_recoveryHandlerSet = false;
}
if (m_initTimer)
{
WdfTimerStop(m_initTimer, TRUE);
@@ -379,8 +385,9 @@ void CDeviceContext::FinishInit(UINT connectorIndex)
{
CDisplayConfiguration::Description description =
m_displayConfiguration.GetDescription();
m_monitorManager.Create(
connectorIndex, m_adapter, std::move(description.edid), this);
if (m_monitorManager.Create(
connectorIndex, m_adapter, std::move(description.edid), this))
m_transport->SyncRecovery();
}
void CDeviceContext::ReplugMonitor()
@@ -460,7 +467,90 @@ void CDeviceContext::SetResolution(uint32_t width, uint32_t height)
bool CDeviceContext::InitializeTransport()
{
return m_transport && m_transport->Initialize();
if (!m_transport)
return false;
if (m_transportTimer)
return true;
g_pipe.SetRecoveryHandler(
[](void * opaque, uint64_t session, uint32_t serial, bool active,
LGPipeMsg::Type result)
{
CDeviceContext * context =
static_cast<CDeviceContext *>(opaque);
ITransport::Recovery state = ITransport::Recovery::FAILED;
uint32_t error = ERROR_SUCCESS;
switch (result)
{
case LGPipeMsg::RECOVERY_OFF:
state = ITransport::Recovery::NORMAL;
break;
case LGPipeMsg::RECOVERY_ON:
state = ITransport::Recovery::ACTIVE;
break;
case LGPipeMsg::RECOVERY_FAILED:
error = ERROR_GEN_FAILURE;
break;
case LGPipeMsg::RECOVERY_NO_DISPLAY:
error = ERROR_NOT_FOUND;
break;
default:
return;
}
context->m_transport->RecoveryStatus(
session, serial, active, state, error);
},
this);
m_recoveryHandlerSet = true;
// Claim the pipe recovery channel before initializing the producer session
// so no request cached by a prior device context can cross the handoff.
if (!m_transport->Initialize())
{
g_pipe.ClearRecoveryHandler(this);
m_recoveryHandlerSet = false;
return false;
}
WDF_TIMER_CONFIG config;
WDF_TIMER_CONFIG_INIT_PERIODIC(&config,
[](WDFTIMER timer) -> void
{
WDFOBJECT parent = WdfTimerGetParentObject(timer);
auto wrapper = WdfObjectGet_CDeviceContextWrapper(parent);
wrapper->context->TransportTimer();
},
10);
config.AutomaticSerialization = FALSE;
/**
* Documentation states that Dispatch is not available under UMDF,
* however using Passive returns a not-supported error and Dispatch works.
*/
WDF_OBJECT_ATTRIBUTES attribs;
WDF_OBJECT_ATTRIBUTES_INIT(&attribs);
attribs.ParentObject = m_wdfDevice;
attribs.ExecutionLevel = WdfExecutionLevelDispatch;
NTSTATUS status = WdfTimerCreate(
&config, &attribs, &m_transportTimer);
if (!NT_SUCCESS(status))
{
g_pipe.ClearRecoveryHandler(this);
m_recoveryHandlerSet = false;
DEBUG_ERROR_HR(status, "Transport timer creation failed");
return false;
}
WdfTimerStart(m_transportTimer, WDF_REL_TIMEOUT_IN_MS(10));
return true;
}
bool CDeviceContext::SetupTransport(size_t alignSize)
@@ -471,36 +561,6 @@ bool CDeviceContext::SetupTransport(size_t alignSize)
{
if (!InitializeTransport() || !m_transport->Setup(alignSize))
return false;
WDF_TIMER_CONFIG config;
WDF_TIMER_CONFIG_INIT_PERIODIC(&config,
[](WDFTIMER timer) -> void
{
WDFOBJECT parent = WdfTimerGetParentObject(timer);
auto wrapper = WdfObjectGet_CDeviceContextWrapper(parent);
wrapper->context->TransportTimer();
},
10);
config.AutomaticSerialization = FALSE;
/**
* Documentation states that Dispatch is not available under UMDF,
* however using Passive returns a not-supported error and Dispatch works.
*/
WDF_OBJECT_ATTRIBUTES attribs;
WDF_OBJECT_ATTRIBUTES_INIT(&attribs);
attribs.ParentObject = m_wdfDevice;
attribs.ExecutionLevel = WdfExecutionLevelDispatch;
NTSTATUS status = WdfTimerCreate(
&config, &attribs, &m_transportTimer);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR_HR(status, "Timer creation failed");
return false;
}
WdfTimerStart(m_transportTimer, WDF_REL_TIMEOUT_IN_MS(10));
}
IInputTransport * input = m_transport->Input();
@@ -542,3 +602,9 @@ void CDeviceContext::OnSetResolution(uint32_t width, uint32_t height)
{
SetResolution(width, height);
}
void CDeviceContext::OnRecoveryRequest(
uint64_t session, uint32_t serial, bool active)
{
g_pipe.SetRecovery(this, session, serial, active);
}