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platforms/drm: GPU power management

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When a GPU has no outputs attached we need to release all resources and
close the fd to allow the driver to completely power down the GPU. This
is also required to allow the driver to be unloaded for VFIO.
This commit is contained in:
Xaver Hugl 2021-05-03 18:03:09 +02:00
parent f881170a1e
commit 089134d0bd
1 changed files with 13 additions and 2 deletions
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15
src/plugins/platforms/drm/drm_backend.cpp
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@ -229,7 +229,6 @@ void DrmBackend::handleUdevEvent()
if (const auto &gpu = addGpu(device->devNode())) {
updateOutputs();
updateCursor();
emit gpuAdded(gpu);
}
}
} else if (device->action() == QStringLiteral("remove")) {
@ -249,6 +248,9 @@ void DrmBackend::handleUdevEvent()
}
} else if (device->action() == QStringLiteral("change")) {
DrmGpu *gpu = findGpu(device->devNum());
if (!gpu) {
gpu = addGpu(device->devNode());
}
if (gpu) {
qCDebug(KWIN_DRM) << "Received hot plug event for monitored drm device";
updateOutputs();
@ -288,6 +290,7 @@ DrmGpu *DrmBackend::addGpu(const QString &fileName)
m_active = true;
connect(gpu, &DrmGpu::outputAdded, this, &DrmBackend::addOutput);
connect(gpu, &DrmGpu::outputRemoved, this, &DrmBackend::removeOutput);
emit gpuAdded(gpu);
return gpu;
} else {
delete gpu;
@ -320,8 +323,16 @@ bool DrmBackend::updateOutputs()
return false;
}
const auto oldOutputs = m_outputs;
for (auto gpu : m_gpus) {
for (auto it = m_gpus.begin(); it < m_gpus.end();) {
auto gpu = *it;
gpu->updateOutputs();
if (gpu->outputs().isEmpty() && gpu != primaryGpu()) {
it = m_gpus.erase(it);
emit gpuRemoved(gpu);
delete gpu;
} else {
it++;
}
}
std::sort(m_outputs.begin(), m_outputs.end(), [] (DrmOutput *a, DrmOutput *b) { return a->m_conn->id() < b->m_conn->id(); });