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https://github.com/genodelabs/genode.git
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35638568c5
This commit replaces the mapping of DMA buffers and gets rid of the bounce-buffer handling, which was introduced to prevent data corruption noticed when utilizing USB storage with Windows 10 guests, with accessing the buffers directly. Due to the way Windows 10 at times manages its DMA memory (many small pieces instead of few larger ones) the unbounded registry becomes a problem when containing stale entries. Changing the 'qemu-usb' implementation allows for using 'read_dma' and 'write_dma' directly. Fixes #5121.
149 lines
3.6 KiB
C++
149 lines
3.6 KiB
C++
/*
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* \brief Qemu USB controller interface
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* \author Josef Soentgen
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* \author Sebastian Sumpf
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* \date 2015-12-14
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*/
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/*
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* Copyright (C) 2015-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__QEMU__USB_H_
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#define _INCLUDE__QEMU__USB_H_
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#include <base/stdint.h>
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#include <base/signal.h>
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#include <base/allocator.h>
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namespace Qemu {
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typedef Genode::size_t size_t;
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typedef Genode::off_t off_t;
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typedef Genode::int64_t int64_t;
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typedef Genode::addr_t addr_t;
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typedef Genode::uint16_t uint16_t;
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/************************************
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** Qemu library backend interface **
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************************************/
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/*
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* The backend interface needs to be provided the user of the library.
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*/
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/**
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* Timer_queue class
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*
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* The library uses the Timer_queue internally to schedule timeouts.
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*/
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struct Timer_queue
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{
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virtual int64_t get_ns() = 0;
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virtual void register_timer(void *qtimer, void (*cb)(void *data), void *data) = 0;
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virtual void delete_timer(void *qtimer) = 0;
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virtual void activate_timer(void *qtimer, long long int expires_abs) = 0;
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virtual void deactivate_timer(void *qtimer) = 0;
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};
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/**
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* Pci_device class
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*
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* The library uses the Pci_device to access physical DMA memory and to
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* raise interrupts.
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*/
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struct Pci_device
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{
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enum class Dma_direction { IN = 0, OUT = 1, };
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/**
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* Raise interrupt
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*
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* \param assert 1 == raise, 0 == deassert interrupt
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*/
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virtual void raise_interrupt(int assert) = 0;
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virtual int read_dma(addr_t addr, void *buf, size_t size) = 0;
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virtual int write_dma(addr_t addr, void const *buf, size_t size) = 0;
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};
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/*************************************
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** Qemu library frontend functions **
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*************************************/
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/**
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* Controller class to access MMIO register of the xHCI device model
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*
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* This class is implemented by the library.
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*/
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struct Controller
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{
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/*
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* Controller information
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*/
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struct Info
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{
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uint16_t vendor_id;
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uint16_t product_id;
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};
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/**
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* Get information of the controller
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*/
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virtual Info info() const = 0;
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/**
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* Size of the MMIO region of the controller
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*/
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virtual size_t mmio_size() const = 0;
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/**
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* Read/write MMIO offset in the MMIO region of the controller
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*/
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virtual int mmio_read(off_t offset, void *buf, size_t size) = 0;
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virtual int mmio_write(off_t offset, void const *buf, size_t size) = 0;
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};
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/**
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* Initialize USB library
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*
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* \param tq Timer_queue instance provided by the user of the library
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* \param pd Pci_device instance provided by the user of the library
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* \param ep Entrypoint used by the library to install signals
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*
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* \return Pointer to Controller object that is used to access the xHCI device state
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*/
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Controller *usb_init(Timer_queue &tq, Pci_device &pd,
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Genode::Entrypoint &ep,
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Genode::Allocator &, Genode::Env &,
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Genode::Xml_node const &);
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/**
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* Reset USB libray
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*/
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void usb_reset();
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/**
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* Update USB devices list
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*
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* Needs to be called after a library reset.
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*/
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void usb_update_devices();
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/**
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* Library timer callback
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*
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* Needs to be called when a timer triggers (see Timer_queue interface).
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*
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* \param cb Callback installed by Timer_queue::register_timer()
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* \param data Data pointer given in Timer_queue::register_timer()
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*/
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void usb_timer_callback(void (*cb)(void *data), void *data);
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}
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#endif /* _INCLUDE__QEMU__USB_H_ */
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