| // Copyright 2019 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef SRC_DEVICES_SYSMEM_DRIVERS_SYSMEM_BUFFER_COLLECTION_TOKEN_H_ |
| #define SRC_DEVICES_SYSMEM_DRIVERS_SYSMEM_BUFFER_COLLECTION_TOKEN_H_ |
| |
| #include <fuchsia/sysmem/c/fidl.h> |
| #include <lib/fidl-async-2/fidl_server.h> |
| #include <lib/fidl-async-2/simple_binding.h> |
| |
| #include "logging.h" |
| #include "logical_buffer_collection.h" |
| |
| namespace sysmem_driver { |
| |
| class BufferCollectionToken |
| : public FidlServer< |
| BufferCollectionToken, |
| SimpleBinding<BufferCollectionToken, fuchsia_sysmem_BufferCollectionToken_ops_t, |
| fuchsia_sysmem_BufferCollectionToken_dispatch>, |
| vLog> { |
| public: |
| ~BufferCollectionToken(); |
| |
| zx_status_t Duplicate(uint32_t rights_attenuation_mask, |
| zx_handle_t buffer_collection_token_request); |
| zx_status_t Sync(fidl_txn_t* txn); |
| zx_status_t Close(); |
| |
| LogicalBufferCollection* parent(); |
| fbl::RefPtr<LogicalBufferCollection> parent_shared(); |
| |
| void SetServerKoid(zx_koid_t server_koid); |
| |
| zx_koid_t server_koid(); |
| |
| bool is_done(); |
| |
| void SetBufferCollectionRequest(zx::channel buffer_collection_request); |
| |
| zx::channel TakeBufferCollectionRequest(); |
| |
| private: |
| friend class FidlServer; |
| BufferCollectionToken(Device* parent_device, fbl::RefPtr<LogicalBufferCollection> parent, |
| uint32_t rights_attenuation_mask); |
| |
| static const fuchsia_sysmem_BufferCollectionToken_ops_t kOps; |
| |
| Device* parent_device_ = nullptr; |
| fbl::RefPtr<LogicalBufferCollection> parent_; |
| // 1 bit means the right is allowed. 0 bit means the right is attenuated. |
| uint32_t rights_attenuation_mask_ = 0; |
| |
| zx_koid_t server_koid_ = ZX_KOID_INVALID; |
| |
| // Becomes true on the first Close() or BindSharedCollection(). This being |
| // true means a channel close is not fatal to the LogicalBufferCollection. |
| // However, if the client sends a redundant Close(), that is fatal to the |
| // BufferCollectionToken and fatal to the LogicalBufferCollection. |
| bool is_done_ = false; |
| |
| // This is set up to once during |
| // LogicalBufferCollection::BindSharedCollection(), and essentially curries |
| // the buffer_collection_request past the processing of any remaining |
| // inbound messages on the BufferCollectionToken before starting to serve |
| // the BufferCollection that the token was exchanged for. This way, inbound |
| // Duplicate() messages in the BufferCollectionToken are seen before any |
| // BufferCollection::SetConstraints() (which might otherwise try to allocate |
| // buffers too soon before all tokens are gone). |
| zx::channel buffer_collection_request_; |
| }; |
| |
| } // namespace sysmem_driver |
| |
| #endif // SRC_DEVICES_SYSMEM_DRIVERS_SYSMEM_BUFFER_COLLECTION_TOKEN_H_ |