Danylo Lytovchenko
98 라인
3.8 KiB
C++
98 라인
3.8 KiB
C++
/* Copyright (c) 2020 - 2021 Advanced Micro Devices, Inc.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE. */
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/** \file Concatenating hostcalls into a message
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*
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* A message is a stream of 64-bit integers transmitted as a series
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* of hostcall invocations by the device code. Although the hostcall
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* is "warp-wide", the message for each workitem is distinct.
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*
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* Of the eight uint64_t arguments in hostcall, the first argument is
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* used as the message descriptor, while the rest are used for
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* message contents. The descriptor consists of the following fields:
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*
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* - Bit 0 is the BEGIN flag.
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* - Bit 1 is the END flag.
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* - Bits 2-4 are reserved and must be zero.
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* - Bits 5-7 indicate the number of elements being transmitted.
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* - Bits 8-63 contain a 56-bit message ID.
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*
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* A hostcall with the BEGIN flag set in the descriptor indicates the
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* start of a new message. A hostcall with the END flag set indicates
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* the end of a message. A single hostcall can have both flags set if
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* the message fits in the payload of a single hostcall. Each
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* hostcall indicates the number of uint64_t elements in the payload
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* that contain data to be appended to the message.
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*
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* When the message receives a hostcall with the BEGIN flag set, it allocates a
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* new message ID, which is transmitted to the device via the first return
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* value in the hostcall. Every subsequent hostcall containing the same message
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* ID appends its payload to that message. The message is said to be "active"
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* until a corresponding END hostcall is received.
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*
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* When the message handler receives a hostcall with the END flag set, it
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* invokes the corresponding message handler on the contents of the
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* accumulated message, and then discards the message. The handler
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* may return up to two uint64_t values, that are transmitted to the
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* device via the return value of the last hostcall.
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*
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* Behaviour is undefined in each of the following cases:
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* - An END packet is received with a non-existent message ID, or with
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* the ID of an inactive message (previously terminated by an END packet).
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* - No END packet is received for an active message.
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* - Any of the reserved bits are non-zero.
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* - Different hostcalls indicate the same active message ID but a
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* different service.
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*/
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#pragma once
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#include <vector>
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namespace amd {
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enum ServiceID {
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SERVICE_RESERVED = 0,
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SERVICE_FUNCTION_CALL = 1,
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SERVICE_PRINTF = 2,
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SERVICE_DEVMEM = 3
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#if defined(__clang__)
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#if __has_feature(address_sanitizer)
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,
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SERVICE_SANITIZER = 4
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#endif
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#endif
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};
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struct Message;
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class MessageHandler {
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std::vector<uint64_t> freeSlots_;
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std::vector<Message*> messageSlots_;
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Message* newMessage();
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Message* getMessage(uint64_t messageId);
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void discardMessage(Message* message);
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public:
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~MessageHandler();
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bool handlePayload(uint32_t service, uint64_t* payload);
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};
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} // namespace amd
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