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llama.cpp
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webgpu : Query for adapter support when registering WebGPU backend (#21579)

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Reese Levine 2026-04-08 06:08:29 -07:00 committed by GitHub
parent dcdcbad42a
commit 5473949070
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1 changed files with 28 additions and 13 deletions
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41
ggml/src/ggml-webgpu/ggml-webgpu.cpp
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@ -4033,8 +4033,14 @@ ggml_backend_reg_t ggml_backend_webgpu_reg() {
WEBGPU_LOG_DEBUG("ggml_backend_webgpu_reg()");
static ggml_backend_webgpu_reg_context ctx;
static ggml_backend_reg reg = {
/* .api_version = */ GGML_BACKEND_API_VERSION,
/* .iface = */ ggml_backend_webgpu_reg_i,
/* .context = */ &ctx,
};
ctx.name = GGML_WEBGPU_NAME;
ctx.device_count = 1;
ctx.device_count = 0;
wgpu::InstanceDescriptor instance_descriptor{};
std::vector<wgpu::InstanceFeatureName> instance_features = { wgpu::InstanceFeatureName::TimedWaitAny };
@ -4053,19 +4059,28 @@ ggml_backend_reg_t ggml_backend_webgpu_reg() {
ctx.webgpu_global_ctx = webgpu_global_context(new webgpu_global_context_struct());
ctx.webgpu_global_ctx->instance = std::move(inst);
#ifdef __EMSCRIPTEN__
if (ctx.webgpu_global_ctx->instance == nullptr) {
GGML_LOG_ERROR("ggml_webgpu: Failed to create WebGPU instance. Make sure either -sASYNCIFY or -sJSPI is set\n");
return nullptr;
}
#endif
GGML_ASSERT(ctx.webgpu_global_ctx->instance != nullptr);
wgpu::Adapter adapter;
if (ctx.webgpu_global_ctx->instance != nullptr) {
wgpu::RequestAdapterOptions options = {};
// probe for adapter support
ctx.webgpu_global_ctx->instance.WaitAny(
ctx.webgpu_global_ctx->instance.RequestAdapter(
&options, wgpu::CallbackMode::AllowSpontaneous,
[&adapter](wgpu::RequestAdapterStatus status, wgpu::Adapter _adapter, const char * message) {
if (status != wgpu::RequestAdapterStatus::Success) {
GGML_LOG_ERROR("ggml_webgpu: Failed to get an adapter: %s\n", message);
return;
}
adapter = std::move(_adapter);
}),
UINT64_MAX);
}
if (adapter != nullptr) {
ctx.device_count = 1;
}
static ggml_backend_reg reg = {
/* .api_version = */ GGML_BACKEND_API_VERSION,
/* .iface = */ ggml_backend_webgpu_reg_i,
/* .context = */ &ctx,
};
return &reg;
}