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Kernel: Make IDEChannel Ref-counted

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Technically not supported by the original ATA specification, IDE
hot swapping is still in practice possible, so the only sane way
to start support it is with ref-counting the IDEChannel object so if we
remove a PATADiskDevice, it's not gone with it.
This commit is contained in:
Liav A 2021-03-27 06:22:55 +03:00 • committed by Andreas Kling
parent 531037db7e
commit dfb6b296cf
5 changed files with 11 additions and 9 deletions
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4
Kernel/Storage/IDEChannel.cpp
View file

@ -45,9 +45,9 @@ namespace Kernel {
#define PCI_Mass_Storage_Class 0x1
#define PCI_IDE_Controller_Subclass 0x1
UNMAP_AFTER_INIT NonnullOwnPtr<IDEChannel> IDEChannel::create(const IDEController& controller, IOAddressGroup io_group, ChannelType type, bool force_pio)
UNMAP_AFTER_INIT NonnullRefPtr<IDEChannel> IDEChannel::create(const IDEController& controller, IOAddressGroup io_group, ChannelType type, bool force_pio)
{
return make<IDEChannel>(controller, io_group, type, force_pio);
return adopt(*new IDEChannel(controller, io_group, type, force_pio));
}
RefPtr<StorageDevice> IDEChannel::master_device() const

8
Kernel/Storage/IDEChannel.h
View file

@ -60,7 +60,8 @@ struct PhysicalRegionDescriptor {
};
class IDEController;
class IDEChannel final : public IRQHandler {
class IDEChannel final : public RefCounted<IDEChannel>
, public IRQHandler {
friend class IDEController;
friend class PATADiskDevice;
AK_MAKE_ETERNAL
@ -104,8 +105,7 @@ public:
};
public:
static NonnullOwnPtr<IDEChannel> create(const IDEController&, IOAddressGroup, ChannelType type, bool force_pio);
IDEChannel(const IDEController&, IOAddressGroup, ChannelType type, bool force_pio);
static NonnullRefPtr<IDEChannel> create(const IDEController&, IOAddressGroup, ChannelType type, bool force_pio);
virtual ~IDEChannel() override;
RefPtr<StorageDevice> master_device() const;
@ -114,6 +114,8 @@ public:
virtual const char* purpose() const override { return "PATA Channel"; }
private:
IDEChannel(const IDEController&, IOAddressGroup, ChannelType type, bool force_pio);
//^ IRQHandler
virtual void handle_irq(const RegisterState&) override;

2
Kernel/Storage/IDEController.h
View file

@ -60,6 +60,6 @@ private:
void initialize(bool force_pio);
void detect_disks();
NonnullOwnPtrVector<IDEChannel> m_channels;
NonnullRefPtrVector<IDEChannel> m_channels;
};
}

4
Kernel/Storage/PATADiskDevice.cpp
View file

@ -58,8 +58,8 @@ const char* PATADiskDevice::class_name() const
void PATADiskDevice::start_request(AsyncBlockDeviceRequest& request)
{
bool use_dma = !m_channel.m_io_group.bus_master_base().is_null() && m_channel.m_dma_enabled.resource();
m_channel.start_request(request, use_dma, is_slave(), m_capabilities);
bool use_dma = !m_channel->m_io_group.bus_master_base().is_null() && m_channel->m_dma_enabled.resource();
m_channel->start_request(request, use_dma, is_slave(), m_capabilities);
}
String PATADiskDevice::device_name() const

2
Kernel/Storage/PATADiskDevice.h
View file

@ -77,7 +77,7 @@ private:
Lock m_lock { "IDEDiskDevice" };
u16 m_capabilities { 0 };
IDEChannel& m_channel;
NonnullRefPtr<IDEChannel> m_channel;
DriveType m_drive_type { DriveType::Master };
InterfaceType m_interface_type { InterfaceType::ATA };
};