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Kernel: Implement an asynchronous device request stack

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This allows issuing asynchronous requests for devices and waiting
on the completion of the request. The requests can cascade into
multiple sub-requests.

Since IRQs may complete at any time, if the current process is no
longer the same that started the process, we need to swich the
paging context before accessing user buffers.

Change the PATA driver to use this model.
This commit is contained in:
Tom 2020-11-02 11:16:01 -07:00 • committed by Andreas Kling
parent 96081010dc
commit 2fd5ce1eb0
17 changed files with 804 additions and 246 deletions
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10
Kernel/Devices/PATADiskDevice.h
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@ -54,13 +54,10 @@ public:
static NonnullRefPtr<PATADiskDevice> create(PATAChannel&, DriveType, int major, int minor);
virtual ~PATADiskDevice() override;
// ^DiskDevice
virtual bool read_blocks(unsigned index, u16 count, UserOrKernelBuffer&) override;
virtual bool write_blocks(unsigned index, u16 count, const UserOrKernelBuffer&) override;
void set_drive_geometry(u16, u16, u16);
// ^BlockDevice
virtual void start_request(AsyncBlockDeviceRequest&) override;
virtual KResultOr<size_t> read(FileDescription&, size_t, UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> write(FileDescription&, size_t, const UserOrKernelBuffer&, size_t) override;
@ -73,11 +70,6 @@ private:
// ^DiskDevice
virtual const char* class_name() const override;
bool wait_for_irq();
bool read_sectors_with_dma(u32 lba, u16 count, UserOrKernelBuffer&);
bool write_sectors_with_dma(u32 lba, u16 count, const UserOrKernelBuffer&);
bool read_sectors(u32 lba, u16 count, UserOrKernelBuffer& buffer);
bool write_sectors(u32 lba, u16 count, const UserOrKernelBuffer& data);
bool is_slave() const;
Lock m_lock { "IDEDiskDevice" };