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https://github.com/RGBCube/serenity
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143339767b
Currently when allocating buffers for USB transfers, it is done once for every transfer rather than once upon creation of the USB device. This commit changes that by moving allocation of buffers to the USB Pipe class where they can be reused.
53 lines
1.9 KiB
C++
53 lines
1.9 KiB
C++
/*
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* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/OwnPtr.h>
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#include <AK/RefPtr.h>
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#include <Kernel/Bus/USB/PacketTypes.h>
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#include <Kernel/Bus/USB/USBPipe.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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#include <Kernel/Memory/PhysicalPage.h>
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#include <Kernel/Memory/Region.h>
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// TODO: Callback stuff in this class please!
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namespace Kernel::USB {
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class Transfer : public RefCounted<Transfer> {
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public:
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static ErrorOr<NonnullRefPtr<Transfer>> try_create(Pipe&, u16 length, Memory::Region& dma_buffer);
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Transfer() = delete;
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~Transfer();
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void set_setup_packet(USBRequestData const& request);
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void set_complete() { m_complete = true; }
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void set_error_occurred() { m_error_occurred = true; }
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ErrorOr<void> write_buffer(u16 len, void* data);
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// `const` here makes sure we don't blow up by writing to a physical address
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USBRequestData const& request() const { return m_request; }
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Pipe const& pipe() const { return m_pipe; }
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Pipe& pipe() { return m_pipe; }
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VirtualAddress buffer() const { return m_dma_buffer.vaddr(); }
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PhysicalAddress buffer_physical() const { return m_dma_buffer.physical_page(0)->paddr(); }
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u16 transfer_data_size() const { return m_transfer_data_size; }
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bool complete() const { return m_complete; }
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bool error_occurred() const { return m_error_occurred; }
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private:
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Transfer(Pipe& pipe, u16 len, Memory::Region& dma_buffer);
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Pipe& m_pipe; // Pipe that initiated this transfer
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Memory::Region& m_dma_buffer; // DMA buffer
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USBRequestData m_request; // USB request
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u16 m_transfer_data_size { 0 }; // Size of the transfer's data stage
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bool m_complete { false }; // Has this transfer been completed?
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bool m_error_occurred { false }; // Did an error occur during this transfer?
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};
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}
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