Bug 1709951 - Make WebGPU handle GPU process loss. r=gfx-reviewers,webidl,jgilbert,smaug

Differential Revision: https://phabricator.services.mozilla.com/D143247
2022-04-27 21:13:21 +00:00 · 2022-04-27 21:13:21 +00:00 · 6e033cd6a3
--- a/dom/webgpu/Adapter.cpp
+++ b/dom/webgpu/Adapter.cpp
@ -41,10 +41,10 @@ Maybe<uint32_t> Adapter::MakeFeatureBits(
  return Some(bits);
 }

-Adapter::Adapter(Instance* const aParent,
+Adapter::Adapter(Instance* const aParent, WebGPUChild* const aBridge,
                 const ffi::WGPUAdapterInformation& aInfo)
    : ChildOf(aParent),
-      mBridge(aParent->mBridge),
+      mBridge(aBridge),
      mId(aInfo.id),
      mFeatures(new SupportedFeatures(this)),
      mLimits(
@ -69,7 +69,7 @@ Adapter::Adapter(Instance* const aParent,
 Adapter::~Adapter() { Cleanup(); }

 void Adapter::Cleanup() {
-  if (mValid && mBridge && mBridge->IsOpen()) {
+  if (mValid && mBridge && mBridge->CanSend()) {
    mValid = false;
    mBridge->SendAdapterDestroy(mId);
  }
@ -85,6 +85,12 @@ already_AddRefed<dom::Promise> Adapter::RequestDevice(
    return nullptr;
  }

+  if (!mBridge->CanSend()) {
+    promise->MaybeRejectWithInvalidStateError(
+        "WebGPUChild cannot send, must recreate Adapter");
+    return promise.forget();
+  }
+
  ffi::WGPULimits limits = {};
  auto request = mBridge->AdapterRequestDevice(mId, aDesc, &limits);
  if (request) {
--- a/dom/webgpu/Adapter.h
+++ b/dom/webgpu/Adapter.h
@ -56,7 +56,8 @@ class Adapter final : public ObjectBase, public ChildOf<Instance> {
  const bool mIsFallbackAdapter = false;

 public:
-  Adapter(Instance* const aParent, const ffi::WGPUAdapterInformation& aInfo);
+  Adapter(Instance* const aParent, WebGPUChild* const aBridge,
+          const ffi::WGPUAdapterInformation& aInfo);
  void GetName(nsString& out) const { out = mName; }
  const RefPtr<SupportedFeatures>& Features() const;
  const RefPtr<SupportedLimits>& Limits() const;
--- a/dom/webgpu/CanvasContext.cpp
+++ b/dom/webgpu/CanvasContext.cpp
@ -69,6 +69,11 @@ void CanvasContext::Configure(const dom::GPUCanvasConfiguration& aDesc) {
  mHandle = layers::CompositableInProcessManager::GetNextHandle();
  mTexture =
      aDesc.mDevice->InitSwapChain(aDesc, mHandle, mGfxFormat, &actualSize);
+  if (!mTexture) {
+    Unconfigure();
+    return;
+  }
+
  mTexture->mTargetContext = this;
  mBridge = aDesc.mDevice->GetBridge();
  mGfxSize = actualSize;
--- a/dom/webgpu/CommandEncoder.cpp
+++ b/dom/webgpu/CommandEncoder.cpp
@ -100,11 +100,10 @@ CommandEncoder::CommandEncoder(Device* const aParent,
 CommandEncoder::~CommandEncoder() { Cleanup(); }

 void CommandEncoder::Cleanup() {
-  if (mValid && mParent) {
+  if (mValid) {
    mValid = false;
-    auto bridge = mParent->GetBridge();
-    if (bridge && bridge->IsOpen()) {
-      bridge->SendCommandEncoderDestroy(mId);
+    if (mBridge->IsOpen()) {
+      mBridge->SendCommandEncoderDestroy(mId);
    }
  }
 }
@ -114,7 +113,7 @@ void CommandEncoder::CopyBufferToBuffer(const Buffer& aSource,
                                        const Buffer& aDestination,
                                        BufferAddress aDestinationOffset,
                                        BufferAddress aSize) {
-  if (mValid) {
+  if (mValid && mBridge->IsOpen()) {
    ipc::ByteBuf bb;
    ffi::wgpu_command_encoder_copy_buffer_to_buffer(
        aSource.mId, aSourceOffset, aDestination.mId, aDestinationOffset, aSize,
@ -127,7 +126,7 @@ void CommandEncoder::CopyBufferToTexture(
    const dom::GPUImageCopyBuffer& aSource,
    const dom::GPUImageCopyTexture& aDestination,
    const dom::GPUExtent3D& aCopySize) {
-  if (mValid) {
+  if (mValid && mBridge->IsOpen()) {
    ipc::ByteBuf bb;
    ffi::wgpu_command_encoder_copy_buffer_to_texture(
        ConvertBufferCopyView(aSource), ConvertTextureCopyView(aDestination),
@ -144,7 +143,7 @@ void CommandEncoder::CopyTextureToBuffer(
    const dom::GPUImageCopyTexture& aSource,
    const dom::GPUImageCopyBuffer& aDestination,
    const dom::GPUExtent3D& aCopySize) {
-  if (mValid) {
+  if (mValid && mBridge->IsOpen()) {
    ipc::ByteBuf bb;
    ffi::wgpu_command_encoder_copy_texture_to_buffer(
        ConvertTextureCopyView(aSource), ConvertBufferCopyView(aDestination),
@ -156,7 +155,7 @@ void CommandEncoder::CopyTextureToTexture(
    const dom::GPUImageCopyTexture& aSource,
    const dom::GPUImageCopyTexture& aDestination,
    const dom::GPUExtent3D& aCopySize) {
-  if (mValid) {
+  if (mValid && mBridge->IsOpen()) {
    ipc::ByteBuf bb;
    ffi::wgpu_command_encoder_copy_texture_to_texture(
        ConvertTextureCopyView(aSource), ConvertTextureCopyView(aDestination),
@ -171,7 +170,7 @@ void CommandEncoder::CopyTextureToTexture(
 }

 void CommandEncoder::PushDebugGroup(const nsAString& aString) {
-  if (mValid) {
+  if (mValid && mBridge->IsOpen()) {
    ipc::ByteBuf bb;
    const NS_ConvertUTF16toUTF8 utf8(aString);
    ffi::wgpu_command_encoder_push_debug_group(utf8.get(), ToFFI(&bb));
@ -179,14 +178,14 @@ void CommandEncoder::PushDebugGroup(const nsAString& aString) {
  }
 }
 void CommandEncoder::PopDebugGroup() {
-  if (mValid) {
+  if (mValid && mBridge->IsOpen()) {
    ipc::ByteBuf bb;
    ffi::wgpu_command_encoder_pop_debug_group(ToFFI(&bb));
    mBridge->SendCommandEncoderAction(mId, mParent->mId, std::move(bb));
  }
 }
 void CommandEncoder::InsertDebugMarker(const nsAString& aString) {
-  if (mValid) {
+  if (mValid && mBridge->IsOpen()) {
    ipc::ByteBuf bb;
    const NS_ConvertUTF16toUTF8 utf8(aString);
    ffi::wgpu_command_encoder_insert_debug_marker(utf8.get(), ToFFI(&bb));
@ -219,7 +218,7 @@ already_AddRefed<RenderPassEncoder> CommandEncoder::BeginRenderPass(

 void CommandEncoder::EndComputePass(ffi::WGPUComputePass& aPass,
                                    ErrorResult& aRv) {
-  if (!mValid) {
+  if (!mValid || !mBridge->IsOpen()) {
    return aRv.ThrowInvalidStateError("Command encoder is not valid");
  }

@ -230,7 +229,7 @@ void CommandEncoder::EndComputePass(ffi::WGPUComputePass& aPass,

 void CommandEncoder::EndRenderPass(ffi::WGPURenderPass& aPass,
                                   ErrorResult& aRv) {
-  if (!mValid) {
+  if (!mValid || !mBridge->IsOpen()) {
    return aRv.ThrowInvalidStateError("Command encoder is not valid");
  }

@ -242,7 +241,7 @@ void CommandEncoder::EndRenderPass(ffi::WGPURenderPass& aPass,
 already_AddRefed<CommandBuffer> CommandEncoder::Finish(
    const dom::GPUCommandBufferDescriptor& aDesc) {
  RawId id = 0;
-  if (mValid) {
+  if (mValid && mBridge->IsOpen()) {
    mValid = false;
    id = mBridge->CommandEncoderFinish(mId, mParent->mId, aDesc);
  }
--- a/dom/webgpu/Device.cpp
+++ b/dom/webgpu/Device.cpp
@ -17,6 +17,7 @@
 #include "Adapter.h"
 #include "Buffer.h"
 #include "ComputePipeline.h"
+#include "DeviceLostInfo.h"
 #include "Queue.h"
 #include "RenderBundleEncoder.h"
 #include "RenderPipeline.h"
@ -35,7 +36,7 @@ mozilla::LazyLogModule gWebGPULog("WebGPU");

 GPU_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_INHERITED(Device, DOMEventTargetHelper,
                                                 mBridge, mQueue, mFeatures,
-                                                 mLimits);
+                                                 mLimits, mLostPromise);
 NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(Device, DOMEventTargetHelper)
 GPU_IMPL_JS_WRAP(Device)

@ -69,10 +70,22 @@ Device::Device(Adapter* const aParent, RawId aId,
 Device::~Device() { Cleanup(); }

 void Device::Cleanup() {
-  if (mValid && mBridge) {
-    mValid = false;
+  if (!mValid) {
+    return;
+  }
+
+  mValid = false;
+
+  if (mBridge) {
    mBridge->UnregisterDevice(mId);
  }
+
+  if (mLostPromise) {
+    auto info = MakeRefPtr<DeviceLostInfo>(GetParentObject(),
+                                           dom::GPUDeviceLostReason::Destroyed,
+                                           u"Device destroyed"_ns);
+    mLostPromise->MaybeResolve(info);
+  }
 }

 void Device::CleanupUnregisteredInParent() {
@ -85,8 +98,25 @@ void Device::CleanupUnregisteredInParent() {
 void Device::GetLabel(nsAString& aValue) const { aValue = mLabel; }
 void Device::SetLabel(const nsAString& aLabel) { mLabel = aLabel; }

+dom::Promise* Device::GetLost(ErrorResult& aRv) {
+  if (!mLostPromise) {
+    mLostPromise = dom::Promise::Create(GetParentObject(), aRv);
+    if (mLostPromise && !mBridge->CanSend()) {
+      auto info = MakeRefPtr<DeviceLostInfo>(GetParentObject(),
+                                             u"WebGPUChild destroyed"_ns);
+      mLostPromise->MaybeResolve(info);
+    }
+  }
+  return mLostPromise;
+}
+
 already_AddRefed<Buffer> Device::CreateBuffer(
    const dom::GPUBufferDescriptor& aDesc, ErrorResult& aRv) {
+  if (!mBridge->CanSend()) {
+    RefPtr<Buffer> buffer = new Buffer(this, 0, aDesc.mSize, false);
+    return buffer.forget();
+  }
+
  ipc::Shmem shmem;
  bool hasMapFlags = aDesc.mUsage & (dom::GPUBufferUsage_Binding::MAP_WRITE |
                                     dom::GPUBufferUsage_Binding::MAP_READ);
@ -157,26 +187,37 @@ RefPtr<MappingPromise> Device::MapBufferAsync(RawId aId, uint32_t aMode,

 void Device::UnmapBuffer(RawId aId, ipc::Shmem&& aShmem, bool aFlush,
                         bool aKeepShmem) {
-  mBridge->SendBufferUnmap(aId, std::move(aShmem), aFlush, aKeepShmem);
+  if (mBridge->CanSend()) {
+    mBridge->SendBufferUnmap(aId, std::move(aShmem), aFlush, aKeepShmem);
+  }
 }

 already_AddRefed<Texture> Device::CreateTexture(
    const dom::GPUTextureDescriptor& aDesc) {
-  RawId id = mBridge->DeviceCreateTexture(mId, aDesc);
+  RawId id = 0;
+  if (mBridge->CanSend()) {
+    id = mBridge->DeviceCreateTexture(mId, aDesc);
+  }
  RefPtr<Texture> texture = new Texture(this, id, aDesc);
  return texture.forget();
 }

 already_AddRefed<Sampler> Device::CreateSampler(
    const dom::GPUSamplerDescriptor& aDesc) {
-  RawId id = mBridge->DeviceCreateSampler(mId, aDesc);
+  RawId id = 0;
+  if (mBridge->CanSend()) {
+    id = mBridge->DeviceCreateSampler(mId, aDesc);
+  }
  RefPtr<Sampler> sampler = new Sampler(this, id);
  return sampler.forget();
 }

 already_AddRefed<CommandEncoder> Device::CreateCommandEncoder(
    const dom::GPUCommandEncoderDescriptor& aDesc) {
-  RawId id = mBridge->DeviceCreateCommandEncoder(mId, aDesc);
+  RawId id = 0;
+  if (mBridge->CanSend()) {
+    id = mBridge->DeviceCreateCommandEncoder(mId, aDesc);
+  }
  RefPtr<CommandEncoder> encoder = new CommandEncoder(this, mBridge, id);
  return encoder.forget();
 }
@ -190,19 +231,28 @@ already_AddRefed<RenderBundleEncoder> Device::CreateRenderBundleEncoder(

 already_AddRefed<BindGroupLayout> Device::CreateBindGroupLayout(
    const dom::GPUBindGroupLayoutDescriptor& aDesc) {
-  RawId id = mBridge->DeviceCreateBindGroupLayout(mId, aDesc);
+  RawId id = 0;
+  if (mBridge->CanSend()) {
+    id = mBridge->DeviceCreateBindGroupLayout(mId, aDesc);
+  }
  RefPtr<BindGroupLayout> object = new BindGroupLayout(this, id, true);
  return object.forget();
 }
 already_AddRefed<PipelineLayout> Device::CreatePipelineLayout(
    const dom::GPUPipelineLayoutDescriptor& aDesc) {
-  RawId id = mBridge->DeviceCreatePipelineLayout(mId, aDesc);
+  RawId id = 0;
+  if (mBridge->CanSend()) {
+    id = mBridge->DeviceCreatePipelineLayout(mId, aDesc);
+  }
  RefPtr<PipelineLayout> object = new PipelineLayout(this, id);
  return object.forget();
 }
 already_AddRefed<BindGroup> Device::CreateBindGroup(
    const dom::GPUBindGroupDescriptor& aDesc) {
-  RawId id = mBridge->DeviceCreateBindGroup(mId, aDesc);
+  RawId id = 0;
+  if (mBridge->CanSend()) {
+    id = mBridge->DeviceCreateBindGroup(mId, aDesc);
+  }
  RefPtr<BindGroup> object = new BindGroup(this, id);
  return object.forget();
 }
@ -210,7 +260,10 @@ already_AddRefed<BindGroup> Device::CreateBindGroup(
 already_AddRefed<ShaderModule> Device::CreateShaderModule(
    JSContext* aCx, const dom::GPUShaderModuleDescriptor& aDesc) {
  Unused << aCx;
-  RawId id = mBridge->DeviceCreateShaderModule(mId, aDesc);
+  RawId id = 0;
+  if (mBridge->CanSend()) {
+    id = mBridge->DeviceCreateShaderModule(mId, aDesc);
+  }
  RefPtr<ShaderModule> object = new ShaderModule(this, id);
  return object.forget();
 }
@ -218,7 +271,10 @@ already_AddRefed<ShaderModule> Device::CreateShaderModule(
 already_AddRefed<ComputePipeline> Device::CreateComputePipeline(
    const dom::GPUComputePipelineDescriptor& aDesc) {
  PipelineCreationContext context = {mId};
-  RawId id = mBridge->DeviceCreateComputePipeline(&context, aDesc);
+  RawId id = 0;
+  if (mBridge->CanSend()) {
+    id = mBridge->DeviceCreateComputePipeline(&context, aDesc);
+  }
  RefPtr<ComputePipeline> object =
      new ComputePipeline(this, id, context.mImplicitPipelineLayoutId,
                          std::move(context.mImplicitBindGroupLayoutIds));
@ -228,7 +284,10 @@ already_AddRefed<ComputePipeline> Device::CreateComputePipeline(
 already_AddRefed<RenderPipeline> Device::CreateRenderPipeline(
    const dom::GPURenderPipelineDescriptor& aDesc) {
  PipelineCreationContext context = {mId};
-  RawId id = mBridge->DeviceCreateRenderPipeline(&context, aDesc);
+  RawId id = 0;
+  if (mBridge->CanSend()) {
+    id = mBridge->DeviceCreateRenderPipeline(&context, aDesc);
+  }
  RefPtr<RenderPipeline> object =
      new RenderPipeline(this, id, context.mImplicitPipelineLayoutId,
                         std::move(context.mImplicitBindGroupLayoutIds));
@ -242,6 +301,11 @@ already_AddRefed<dom::Promise> Device::CreateComputePipelineAsync(
    return nullptr;
  }

+  if (!mBridge->CanSend()) {
+    promise->MaybeRejectWithOperationError("Internal communication error");
+    return promise.forget();
+  }
+
  std::shared_ptr<PipelineCreationContext> context(
      new PipelineCreationContext());
  context->mParentId = mId;
@ -269,6 +333,11 @@ already_AddRefed<dom::Promise> Device::CreateRenderPipelineAsync(
    return nullptr;
  }

+  if (!mBridge->CanSend()) {
+    promise->MaybeRejectWithOperationError("Internal communication error");
+    return promise.forget();
+  }
+
  std::shared_ptr<PipelineCreationContext> context(
      new PipelineCreationContext());
  context->mParentId = mId;
@ -293,6 +362,10 @@ already_AddRefed<Texture> Device::InitSwapChain(
    const dom::GPUCanvasConfiguration& aDesc,
    const layers::CompositableHandle& aHandle, gfx::SurfaceFormat aFormat,
    gfx::IntSize* aCanvasSize) {
+  if (!mBridge->CanSend()) {
+    return nullptr;
+  }
+
  gfx::IntSize size = *aCanvasSize;
  if (aDesc.mSize.WasPassed()) {
    const auto& descSize = aDesc.mSize.Value();
@ -338,7 +411,9 @@ void Device::Destroy() {
 }

 void Device::PushErrorScope(const dom::GPUErrorFilter& aFilter) {
-  mBridge->SendDevicePushErrorScope(mId);
+  if (mBridge->CanSend()) {
+    mBridge->SendDevicePushErrorScope(mId);
+  }
 }

 already_AddRefed<dom::Promise> Device::PopErrorScope(ErrorResult& aRv) {
@ -347,6 +422,11 @@ already_AddRefed<dom::Promise> Device::PopErrorScope(ErrorResult& aRv) {
    return nullptr;
  }

+  if (!mBridge->CanSend()) {
+    promise->MaybeRejectWithOperationError("Internal communication error");
+    return promise.forget();
+  }
+
  auto errorPromise = mBridge->SendDevicePopErrorScope(mId);

  errorPromise->Then(
--- a/dom/webgpu/Device.h
+++ b/dom/webgpu/Device.h
@ -118,12 +118,15 @@ class Device final : public DOMEventTargetHelper, public SupportsWeakPtr {
  RefPtr<WebGPUChild> mBridge;
  bool mValid = true;
  nsString mLabel;
+  RefPtr<dom::Promise> mLostPromise;
  RefPtr<Queue> mQueue;
  nsTHashSet<nsCString> mKnownWarnings;

 public:
  void GetLabel(nsAString& aValue) const;
  void SetLabel(const nsAString& aLabel);
+  dom::Promise* GetLost(ErrorResult& aRv);
+  dom::Promise* MaybeGetLost() const { return mLostPromise; }

  const RefPtr<SupportedFeatures>& Features() const { return mFeatures; }
  const RefPtr<SupportedLimits>& Limits() const { return mLimits; }
--- a/dom/webgpu/DeviceLostInfo.cpp
+++ b/dom/webgpu/DeviceLostInfo.cpp
@ -4,12 +4,11 @@
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 #include "DeviceLostInfo.h"
-#include "mozilla/dom/WebGPUBinding.h"

 namespace mozilla {
 namespace webgpu {

-GPU_IMPL_CYCLE_COLLECTION(DeviceLostInfo, mParent)
+GPU_IMPL_CYCLE_COLLECTION(DeviceLostInfo, mGlobal)
 GPU_IMPL_JS_WRAP(DeviceLostInfo)

 }  // namespace webgpu
--- a/dom/webgpu/DeviceLostInfo.h
+++ b/dom/webgpu/DeviceLostInfo.h
@ -6,28 +6,46 @@
 #ifndef GPU_DeviceLostInfo_H_
 #define GPU_DeviceLostInfo_H_

+#include "mozilla/dom/WebGPUBinding.h"
+#include "mozilla/Maybe.h"
 #include "nsWrapperCache.h"
 #include "ObjectModel.h"

-namespace mozilla {
-namespace webgpu {
+namespace mozilla::webgpu {
 class Device;

-class DeviceLostInfo final : public nsWrapperCache, public ChildOf<Device> {
+class DeviceLostInfo final : public nsWrapperCache {
 public:
  GPU_DECL_CYCLE_COLLECTION(DeviceLostInfo)
  GPU_DECL_JS_WRAP(DeviceLostInfo)

+  explicit DeviceLostInfo(nsIGlobalObject* const aGlobal,
+                          const nsAString& aMessage)
+      : mGlobal(aGlobal), mMessage(aMessage) {}
+  DeviceLostInfo(nsIGlobalObject* const aGlobal,
+                 dom::GPUDeviceLostReason aReason, const nsAString& aMessage)
+      : mGlobal(aGlobal), mReason(Some(aReason)), mMessage(aMessage) {}
+
 private:
-  DeviceLostInfo() = delete;
  ~DeviceLostInfo() = default;
  void Cleanup() {}

+  nsCOMPtr<nsIGlobalObject> mGlobal;
+  const Maybe<dom::GPUDeviceLostReason> mReason;
+  const nsAutoString mMessage;
+
 public:
-  void GetMessage(nsAString& aValue) const {}
+  void GetReason(JSContext* aCx, JS::MutableHandle<JS::Value> aRetval) {
+    if (!mReason || !dom::ToJSValue(aCx, mReason.value(), aRetval)) {
+      aRetval.setUndefined();
+    }
+  }
+
+  void GetMessage(nsAString& aValue) const { aValue = mMessage; }
+
+  nsIGlobalObject* GetParentObject() const { return mGlobal; }
 };

-}  // namespace webgpu
-}  // namespace mozilla
+}  // namespace mozilla::webgpu

 #endif  // GPU_DeviceLostInfo_H_
--- a/dom/webgpu/Instance.cpp
+++ b/dom/webgpu/Instance.cpp
@ -17,25 +17,15 @@
 namespace mozilla {
 namespace webgpu {

-GPU_IMPL_CYCLE_COLLECTION(Instance, mBridge, mOwner)
+GPU_IMPL_CYCLE_COLLECTION(Instance, mOwner)

 /*static*/
 already_AddRefed<Instance> Instance::Create(nsIGlobalObject* aOwner) {
-  RefPtr<WebGPUChild> bridge;
-
-  if (gfx::gfxVars::AllowWebGPU()) {
-    bridge = gfx::CanvasManagerChild::Get()->GetWebGPUChild();
-    if (NS_WARN_IF(!bridge)) {
-      MOZ_CRASH("Failed to create an IPDL bridge for WebGPU!");
-    }
-  }
-
-  RefPtr<Instance> result = new Instance(aOwner, bridge);
+  RefPtr<Instance> result = new Instance(aOwner);
  return result.forget();
 }

-Instance::Instance(nsIGlobalObject* aOwner, WebGPUChild* aBridge)
-    : mBridge(aBridge), mOwner(aOwner) {}
+Instance::Instance(nsIGlobalObject* aOwner) : mOwner(aOwner) {}

 Instance::~Instance() { Cleanup(); }

@ -52,20 +42,34 @@ already_AddRefed<dom::Promise> Instance::RequestAdapter(
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }
-  if (!mBridge) {
-    promise->MaybeRejectWithInvalidStateError("WebGPU is not enabled!");
+
+  if (!gfx::gfxVars::AllowWebGPU()) {
+    promise->MaybeRejectWithNotSupportedError("WebGPU is not enabled!");
+    return promise.forget();
+  }
+
+  auto* const canvasManager = gfx::CanvasManagerChild::Get();
+  if (!canvasManager) {
+    promise->MaybeRejectWithInvalidStateError(
+        "Failed to create CanavasManagerChild");
+    return promise.forget();
+  }
+
+  RefPtr<WebGPUChild> bridge = canvasManager->GetWebGPUChild();
+  if (!bridge) {
+    promise->MaybeRejectWithInvalidStateError("Failed to create WebGPUChild");
    return promise.forget();
  }

  RefPtr<Instance> instance = this;

-  mBridge->InstanceRequestAdapter(aOptions)->Then(
+  bridge->InstanceRequestAdapter(aOptions)->Then(
      GetCurrentSerialEventTarget(), __func__,
-      [promise, instance](ipc::ByteBuf aInfoBuf) {
+      [promise, instance, bridge](ipc::ByteBuf aInfoBuf) {
        ffi::WGPUAdapterInformation info = {};
        ffi::wgpu_client_adapter_extract_info(ToFFI(&aInfoBuf), &info);
        MOZ_ASSERT(info.id != 0);
-        RefPtr<Adapter> adapter = new Adapter(instance, info);
+        RefPtr<Adapter> adapter = new Adapter(instance, bridge, info);
        promise->MaybeResolve(adapter);
      },
      [promise](const Maybe<ipc::ResponseRejectReason>& aResponseReason) {
--- a/dom/webgpu/Instance.h
+++ b/dom/webgpu/Instance.h
@ -35,10 +35,8 @@ class Instance final : public nsWrapperCache {
  already_AddRefed<dom::Promise> RequestAdapter(
      const dom::GPURequestAdapterOptions& aOptions, ErrorResult& aRv);

-  RefPtr<WebGPUChild> mBridge;
-
 private:
-  explicit Instance(nsIGlobalObject* aOwner, WebGPUChild* aBridge);
+  explicit Instance(nsIGlobalObject* aOwner);
  virtual ~Instance();
  void Cleanup();

--- a/dom/webgpu/RenderBundleEncoder.cpp
+++ b/dom/webgpu/RenderBundleEncoder.cpp
@ -31,6 +31,10 @@ void ScopedFfiBundleTraits::release(ffi::WGPURenderBundleEncoder* raw) {
 ffi::WGPURenderBundleEncoder* CreateRenderBundleEncoder(
    RawId aDeviceId, const dom::GPURenderBundleEncoderDescriptor& aDesc,
    WebGPUChild* const aBridge) {
+  if (!aBridge->CanSend()) {
+    return nullptr;
+  }
+
  ffi::WGPURenderBundleEncoderDescriptor desc = {};
  desc.sample_count = aDesc.mSampleCount;

@ -183,7 +187,7 @@ already_AddRefed<RenderBundle> RenderBundleEncoder::Finish(
  if (mValid) {
    mValid = false;
    auto bridge = mParent->GetBridge();
-    if (bridge && bridge->IsOpen()) {
+    if (bridge && bridge->CanSend()) {
      auto* encoder = mEncoder.forget();
      MOZ_ASSERT(encoder);
      id = bridge->RenderBundleEncoderFinish(*encoder, mParent->mId, aDesc);
--- a/dom/webgpu/Texture.cpp
+++ b/dom/webgpu/Texture.cpp
@ -105,7 +105,12 @@ void Texture::Cleanup() {

 already_AddRefed<TextureView> Texture::CreateView(
    const dom::GPUTextureViewDescriptor& aDesc) {
-  RawId id = mParent->GetBridge()->TextureCreateView(mId, mParent->mId, aDesc);
+  auto bridge = mParent->GetBridge();
+  RawId id = 0;
+  if (bridge->IsOpen()) {
+    id = bridge->TextureCreateView(mId, mParent->mId, aDesc);
+  }
+
  RefPtr<TextureView> view = new TextureView(this, id);
  return view.forget();
 }
--- a/dom/webgpu/ipc/WebGPUChild.cpp
+++ b/dom/webgpu/ipc/WebGPUChild.cpp
@ -6,12 +6,14 @@
 #include "WebGPUChild.h"
 #include "js/Warnings.h"  // JS::WarnUTF8
 #include "mozilla/EnumTypeTraits.h"
+#include "mozilla/dom/Promise.h"
 #include "mozilla/dom/ScriptSettings.h"
 #include "mozilla/dom/WebGPUBinding.h"
 #include "mozilla/dom/GPUUncapturedErrorEvent.h"
 #include "mozilla/webgpu/ValidationError.h"
 #include "mozilla/webgpu/ffi/wgpu.h"
 #include "Adapter.h"
+#include "DeviceLostInfo.h"
 #include "Sampler.h"

 namespace mozilla {
@ -1050,5 +1052,34 @@ void WebGPUChild::FreeUnregisteredInParentDevice(RawId aId) {
  mDeviceMap.erase(aId);
 }

+void WebGPUChild::ActorDestroy(ActorDestroyReason) {
+  // Resolving the promise could cause us to update the original map if the
+  // callee frees the Device objects immediately. Since any remaining entries
+  // in the map are no longer valid, we can just move the map onto the stack.
+  const auto deviceMap = std::move(mDeviceMap);
+  mDeviceMap.clear();
+
+  for (const auto& targetIter : deviceMap) {
+    RefPtr<Device> device = targetIter.second.get();
+    if (!device) {
+      // The Device may have gotten freed when we resolved the Promise for
+      // another Device in the map.
+      continue;
+    }
+
+    RefPtr<dom::Promise> promise = device->MaybeGetLost();
+    if (!promise) {
+      continue;
+    }
+
+    auto info = MakeRefPtr<DeviceLostInfo>(device->GetParentObject(),
+                                           u"WebGPUChild destroyed"_ns);
+
+    // We have strong references to both the Device and the DeviceLostInfo and
+    // the Promise objects on the stack which keeps them alive for long enough.
+    promise->MaybeResolve(info);
+  }
+}
+
 }  // namespace webgpu
 }  // namespace mozilla
--- a/dom/webgpu/ipc/WebGPUChild.h
+++ b/dom/webgpu/ipc/WebGPUChild.h
@ -133,6 +133,7 @@ class WebGPUChild final : public PWebGPUChild, public SupportsWeakPtr {
  ipc::IPCResult RecvDeviceUncapturedError(RawId aDeviceId,
                                           const nsACString& aMessage);
  ipc::IPCResult RecvDropAction(const ipc::ByteBuf& aByteBuf);
+  void ActorDestroy(ActorDestroyReason) override;
 };

 }  // namespace webgpu
--- a/dom/webidl/WebGPU.webidl
+++ b/dom/webidl/WebGPU.webidl
@ -188,9 +188,14 @@ GPUDevice includes GPUObjectBase;
 // ERROR HANDLING
 // ****************************************************************************

+enum GPUDeviceLostReason {
+    "destroyed",
+};
+
 [Pref="dom.webgpu.enabled",
 Exposed=(Window,DedicatedWorker)]
 interface GPUDeviceLostInfo {
+    readonly attribute any reason; // GPUDeviceLostReason or undefined
    readonly attribute DOMString message;
 };

@ -216,7 +221,8 @@ interface GPUValidationError {
 typedef (GPUOutOfMemoryError or GPUValidationError) GPUError;

 partial interface GPUDevice {
-    //readonly attribute Promise<GPUDeviceLostInfo> lost;
+    [Throws]
+    readonly attribute Promise<GPUDeviceLostInfo> lost;
    void pushErrorScope(GPUErrorFilter filter);
    [NewObject]
    Promise<GPUError?> popErrorScope();