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[Feature] (SharedImage): server-allocated AHB images over a shared_image pipe verb, with dma-buf fds on the aux socket

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swung0x48
2026-10-02 07:52:25 -04:00
parent e06aabe812
commit 38842985f8
26 changed files with 954 additions and 27 deletions
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MobileGL/MG_Remote/Client/ClientSession.cpp
+53
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@@ -2857,6 +2857,59 @@ namespace MobileGL::MG_Remote::Client {
return nullptr;
}
Bool ClientSession::EmitSharedImage(const MG_Pipe::MGPSharedImageOp& op, int sendFd,
MG_Pipe::MGPSharedImageReply* reply, int* receivedFd) {
if (receivedFd != nullptr) *receivedFd = -1;
MobileGLResult shared = MOBILEGL_OK;
if (sendFd >= 0) {
m_prePublish = [&](Uint64 seq) {
MG_Pipe::MGPSharedImageFdOffer offer{MG_Pipe::kMGPSharedImageFdMagic, 1, seq, op.ImageId, 0};
shared = m_transport != nullptr ? m_transport->ShareFd(sendFd, MobileGLByteSpan{&offer, sizeof(offer)})
: MOBILEGL_ERR_NOT_INITIALIZED;
};
}
MG_Pipe::MGPSharedImageReply answer{};
Int32 status = Wire::ReplySink::kStatusError;
Uint64 returned = 0;
const Uint64 seq = EmitAndWait(MG_Pipe::MGPWireOp::SharedImage, &op, sizeof(op), nullptr, 0, &answer,
sizeof(answer), &status, &returned);
m_prePublish = nullptr;
if (shared != MOBILEGL_OK) {
MGLOG_E("MG_Remote client: a shared-image descriptor could not be queued on the aux socket (rc=%d)",
static_cast<int>(shared));
}
if (status != Wire::ReplySink::kStatusOk || returned != sizeof(answer)) return false;
if (reply != nullptr) *reply = answer;
if (receivedFd == nullptr) return true;
#if defined(_WIN32)
return false;
#else
if (m_transport == nullptr) return false;
for (;;) {
int fd = -1;
Uint8 sideband[Transport::FdPassing::kMaxSidebandBytes] = {};
std::uint64_t sidebandSize = 0;
const MobileGLResult received =
m_transport->ReceiveFd(&fd, MobileGLMutableByteSpan{sideband, sizeof(sideband)}, &sidebandSize, 2000);
if (received != MOBILEGL_OK) {
MGLOG_E("MG_Remote client: shared image %llu was answered but its descriptor did not arrive (rc=%d)",
static_cast<unsigned long long>(answer.ImageId), static_cast<int>(received));
return false;
}
MG_Pipe::MGPSharedImageFdOffer offer{};
if (sidebandSize == sizeof(offer)) std::memcpy(&offer, sideband, sizeof(offer));
if (offer.Magic == MG_Pipe::kMGPSharedImageFdMagic && offer.Seq == seq && offer.ImageId == answer.ImageId) {
*receivedFd = fd;
return true;
}
// An earlier record's descriptor whose answer was never taken: not this one.
MGLOG_W("MG_Remote client: an aux descriptor for record %llu arrived while record %llu's was awaited; closed",
static_cast<unsigned long long>(offer.Seq), static_cast<unsigned long long>(seq));
::close(fd);
}
#endif
}
void ClientSession::ReleaseT0Store(MG_Pipe::MGPipeHandle handle) {
auto it = m_t0Stores.find(T0Key(handle));
if (it == m_t0Stores.end()) return;