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Kernel/PCI: Introduce a new ECAM access mechanism

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Now the kernel supports 2 ECAM access methods.
MMIOAccess was renamed to WindowedMMIOAccess and is what we had until
now - each device that is detected on boot is assigned to a
memory-mapped window, so IO operations on multiple devices can occur
simultaneously due to creating multiple virtual mappings, hence the name
is a memory-mapped window.

This commit adds a new class called MMIOAccess (not to be confused with
the old MMIOAccess class). This class creates one memory-mapped window.
On each IO operation on a configuration space of a device, it maps the
requested PCI bus region to that window. Therefore it holds a SpinLock
during the operation to ensure that no other PCI bus region was mapped
during the call.

A user can choose to either use PCI ECAM with memory-mapped window
for each device, or for an entire bus. By default, the kernel prefers to
map the entire PCI bus region.
This commit is contained in:
Liav A 2021-04-03 16:46:04 +03:00 • committed by Andreas Kling
parent 441e374396
commit 8abbb7e090
11 changed files with 320 additions and 100 deletions
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75
Kernel/PCI/WindowedMMIOAccess.h Normal file
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/*
* Copyright (c) 2020-2021, Liav A. <liavalb@hotmail.co.il>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/HashMap.h>
#include <AK/NonnullOwnPtrVector.h>
#include <AK/OwnPtr.h>
#include <AK/Types.h>
#include <Kernel/ACPI/Definitions.h>
#include <Kernel/PCI/Access.h>
#include <Kernel/PCI/MMIOAccess.h>
#include <Kernel/VM/AnonymousVMObject.h>
#include <Kernel/VM/PhysicalRegion.h>
#include <Kernel/VM/Region.h>
#include <Kernel/VM/VMObject.h>
namespace Kernel {
namespace PCI {
class DeviceConfigurationSpaceMapping {
public:
DeviceConfigurationSpaceMapping(Address, const MMIOAccess::MMIOSegment&);
VirtualAddress vaddr() const { return m_mapped_region->vaddr(); };
PhysicalAddress paddr() const { return m_mapped_region->physical_page(0)->paddr(); }
const Address& address() const { return m_device_address; };
private:
Address m_device_address;
NonnullOwnPtr<Region> m_mapped_region;
};
class WindowedMMIOAccess final : public MMIOAccess {
public:
static void initialize(PhysicalAddress mcfg);
private:
explicit WindowedMMIOAccess(PhysicalAddress mcfg);
virtual const char* access_type() const override { return "WindowedMMIOAccess"; };
virtual void write8_field(Address address, u32, u8) override;
virtual void write16_field(Address address, u32, u16) override;
virtual void write32_field(Address address, u32, u32) override;
virtual u8 read8_field(Address address, u32) override;
virtual u16 read16_field(Address address, u32) override;
virtual u32 read32_field(Address address, u32) override;
Optional<VirtualAddress> get_device_configuration_space(Address address);
NonnullOwnPtrVector<DeviceConfigurationSpaceMapping> m_mapped_device_regions;
};
}
}