15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// This file contains the implementation of the command parser. 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "gpu/command_buffer/service/cmd_parser.h" 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/debug/trace_event.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace gpu { 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)CommandParser::CommandParser(AsyncAPIInterface* handler) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : get_(0), 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) put_(0), 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer_(NULL), 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) entry_count_(0), 191e9bf3e0803691d0a228da41fc608347b6db4340Torne (Richard Coles) handler_(handler) { 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void CommandParser::SetBuffer( 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void* shm_address, 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t shm_size, 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptrdiff_t offset, 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t size) { 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // check proper alignments. 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(0, (reinterpret_cast<intptr_t>(shm_address)) % 4); 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(0, offset % 4); 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(0u, size % 4); 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // check that the command buffer fits into the memory buffer. 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_GE(shm_size, offset + size); 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) get_ = 0; 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) put_ = 0; 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) char* buffer_begin = static_cast<char*>(shm_address) + offset; 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer_ = reinterpret_cast<CommandBufferEntry*>(buffer_begin); 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) entry_count_ = size / 4; 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Process one command, reading the header from the command buffer, and 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// forwarding the command index and the arguments to the handler. 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Note that: 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// - validation needs to happen on a copy of the data (to avoid race 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// conditions). This function only validates the header, leaving the arguments 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// validation to the handler, so it can pass a reference to them. 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// - get_ is modified *after* the command has been executed. 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)error::Error CommandParser::ProcessCommand() { 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CommandBufferOffset get = get_; 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (get == put_) 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return error::kNoError; 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CommandHeader header = buffer_[get].value_header; 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (header.size == 0) { 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Error: zero sized command in command buffer"; 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return error::kInvalidSize; 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (static_cast<int>(header.size) + get > entry_count_) { 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Error: get offset out of bounds"; 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return error::kOutOfBounds; 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 631e9bf3e0803691d0a228da41fc608347b6db4340Torne (Richard Coles) TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cb_command"), 641e9bf3e0803691d0a228da41fc608347b6db4340Torne (Richard Coles) handler_->GetCommandName(header.command)); 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error::Error result = handler_->DoCommand( 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) header.command, header.size - 1, buffer_ + get); 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(gman): If you want to log errors this is the best place to catch them. 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // It seems like we need an official way to turn on a debug mode and 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // get these errors. 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (error::IsError(result)) { 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ReportError(header.command, result); 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If get was not set somewhere else advance it. 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (get == get_ && result != error::kDeferCommandUntilLater) 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) get_ = (get + header.size) % entry_count_; 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return result; 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void CommandParser::ReportError(unsigned int command_id, 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error::Error result) { 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Error: " << result << " for Command " 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) << handler_->GetCommandName(command_id); 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Processes all the commands, while the buffer is not empty. Stop if an error 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// is encountered. 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)error::Error CommandParser::ProcessAllCommands() { 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (!IsEmpty()) { 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) error::Error error = ProcessCommand(); 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (error) 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return error; 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return error::kNoError; 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace gpu 101