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Revert "Kernel: Implement an asynchronous device request stack"

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This reverts commit 2fd5ce1eb0.

This broke booting without SMP. (PR was #3921)
This commit is contained in:
Andreas Kling 2020-11-04 21:25:26 +01:00
parent 70eaadc1cd
commit 501cef2bd7
17 changed files with 245 additions and 803 deletions
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175
Kernel/Devices/AsyncDeviceRequest.h
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@ -1,175 +0,0 @@
/*
* Copyright (c) 2020, The SerenityOS developers.
* 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/NonnullRefPtrVector.h>
#include <Kernel/Process.h>
#include <Kernel/Thread.h>
#include <Kernel/UserOrKernelBuffer.h>
#include <Kernel/VM/ProcessPagingScope.h>
#include <Kernel/WaitQueue.h>
namespace Kernel {
class Device;
class AsyncDeviceRequest : public RefCounted<AsyncDeviceRequest> {
AK_MAKE_NONCOPYABLE(AsyncDeviceRequest);
AK_MAKE_NONMOVABLE(AsyncDeviceRequest);
public:
enum RequestResult {
Pending = 0,
Started,
Success,
Failure,
MemoryFault,
Cancelled
};
class RequestWaitResult {
friend class AsyncDeviceRequest;
public:
RequestResult request_result() const { return m_request_result; }
Thread::BlockResult wait_result() const { return m_wait_result; }
private:
RequestWaitResult(RequestResult request_result, Thread::BlockResult wait_result)
: m_request_result(request_result)
, m_wait_result(wait_result)
{
}
RequestResult m_request_result;
Thread::BlockResult m_wait_result;
};
virtual ~AsyncDeviceRequest();
virtual const char* name() const = 0;
virtual void start() = 0;
void add_sub_request(NonnullRefPtr<AsyncDeviceRequest>);
[[nodiscard]] RequestWaitResult wait(timeval* = nullptr);
void do_start(Badge<Device>)
{
do_start();
}
void complete(RequestResult result);
void set_private(void* priv)
{
ASSERT(!m_private || !priv);
m_private = priv;
}
void* get_private() const { return m_private; }
template<typename... Args>
[[nodiscard]] bool write_to_buffer(UserOrKernelBuffer& buffer, Args... args)
{
if (in_target_context(buffer))
return buffer.write(forward<Args>(args)...);
ProcessPagingScope paging_scope(m_process);
return buffer.write(forward<Args>(args)...);
}
template<size_t BUFFER_BYTES, typename... Args>
[[nodiscard]] bool write_to_buffer_buffered(UserOrKernelBuffer& buffer, Args... args)
{
if (in_target_context(buffer))
return buffer.write_buffered<BUFFER_BYTES>(forward<Args>(args)...);
ProcessPagingScope paging_scope(m_process);
return buffer.write_buffered<BUFFER_BYTES>(forward<Args>(args)...);
}
template<typename... Args>
[[nodiscard]] bool read_from_buffer(const UserOrKernelBuffer& buffer, Args... args)
{
if (in_target_context(buffer))
return buffer.read(forward<Args>(args)...);
ProcessPagingScope paging_scope(m_process);
return buffer.read(forward<Args>(args)...);
}
template<size_t BUFFER_BYTES, typename... Args>
[[nodiscard]] bool read_from_buffer_buffered(const UserOrKernelBuffer& buffer, Args... args)
{
if (in_target_context(buffer))
return buffer.read_buffered<BUFFER_BYTES>(forward<Args>(args)...);
ProcessPagingScope paging_scope(m_process);
return buffer.read_buffered<BUFFER_BYTES>(forward<Args>(args)...);
}
protected:
AsyncDeviceRequest(Device&);
RequestResult get_request_result() const;
private:
void sub_request_finished(AsyncDeviceRequest&);
void request_finished();
void do_start()
{
{
ScopedSpinLock lock(m_lock);
if (is_completed_result(m_result))
return;
m_result = Started;
}
start();
}
bool in_target_context(const UserOrKernelBuffer& buffer) const
{
if (buffer.is_kernel_buffer())
return true;
return m_process == Process::current();
}
static bool is_completed_result(RequestResult result)
{
return result > Started;
}
Device& m_device;
AsyncDeviceRequest* m_parent_request { nullptr };
RequestResult m_result { Pending };
NonnullRefPtrVector<AsyncDeviceRequest> m_sub_requests_pending;
NonnullRefPtrVector<AsyncDeviceRequest> m_sub_requests_complete;
WaitQueue m_queue;
NonnullRefPtr<Process> m_process;
void* m_private { nullptr };
mutable SpinLock<u8> m_lock;
};
}