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Kernel: Add polling support to NVMe

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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`.
This commit is contained in:
Pankaj Raghav 2022-01-27 16:44:58 +05:30 • committed by Andreas Kling
parent aa832ee251
commit d234e6b801
13 changed files with 211 additions and 83 deletions
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24
Kernel/Storage/NVMe/NVMeInterruptQueue.h Normal file
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/*
* Copyright (c) 2022, Pankaj R <pankydev8@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/Storage/NVMe/NVMeQueue.h>
namespace Kernel {
class NVMeInterruptQueue : public NVMeQueue
, public IRQHandler {
public:
NVMeInterruptQueue(NonnullOwnPtr<Memory::Region> rw_dma_region, Memory::PhysicalPage const& rw_dma_page, u16 qid, u8 irq, 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);
void submit_sqe(NVMeSubmission& submission) override;
virtual ~NVMeInterruptQueue() override {};
private:
virtual void complete_current_request(u16 status) override;
bool handle_irq(RegisterState const&) override;
};
}