mirror of
https://github.com/RGBCube/serenity
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d234e6b801
Add polling support to NVMe so that it does not use interrupt to complete a IO but instead actively polls for completion. This probably is not very efficient in terms of CPU usage but it does not use interrupts to complete a IO which is beneficial at the moment as there is no MSI(X) support and it can reduce the latency of an IO in a very fast NVMe device. The NVMeQueue class has been made the base class for NVMeInterruptQueue and NVMePollQueue. The factory function `NVMeQueue::try_create` will return the appropriate queue to the controller based on the polling boot parameter. The polling mode can be enabled by adding an extra boot parameter: `nvme_poll`.
44 lines
1.6 KiB
C++
44 lines
1.6 KiB
C++
/*
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* Copyright (c) 2022, Pankaj R <pankydev8@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "NVMePollQueue.h"
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#include "Kernel/Arch/x86/IO.h"
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#include "Kernel/Devices/BlockDevice.h"
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#include "NVMeDefinitions.h"
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namespace Kernel {
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UNMAP_AFTER_INIT NVMePollQueue::NVMePollQueue(NonnullOwnPtr<Memory::Region> rw_dma_region, Memory::PhysicalPage const& rw_dma_page, u16 qid, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> cq_dma_page, OwnPtr<Memory::Region> sq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> sq_dma_page, Memory::TypedMapping<volatile DoorbellRegister> db_regs)
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: NVMeQueue(move(rw_dma_region), rw_dma_page, qid, q_depth, move(cq_dma_region), cq_dma_page, move(sq_dma_region), sq_dma_page, move(db_regs))
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{
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}
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void NVMePollQueue::submit_sqe(NVMeSubmission& sub)
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{
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NVMeQueue::submit_sqe(sub);
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SpinlockLocker lock_cq(m_cq_lock);
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while (!process_cq()) {
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IO::delay(1);
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}
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}
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void NVMePollQueue::complete_current_request(u16 status)
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{
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auto current_request = m_current_request;
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m_current_request.clear();
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if (status) {
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current_request->complete(AsyncBlockDeviceRequest::Failure);
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return;
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}
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if (current_request->request_type() == AsyncBlockDeviceRequest::RequestType::Read) {
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if (auto result = current_request->write_to_buffer(current_request->buffer(), m_rw_dma_region->vaddr().as_ptr(), 512 * current_request->block_count()); result.is_error()) {
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current_request->complete(AsyncDeviceRequest::MemoryFault);
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return;
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}
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}
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current_request->complete(AsyncDeviceRequest::Success);
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return;
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}
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}
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