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The Storage subsystem, like the Audio and HID subsystems, exposes Unix device files (for example, in the /dev directory). To ensure consistency across the repository, we should make the Storage subsystem to reside in the Kernel/Devices directory like the two other mentioned subsystems.
42 lines
1.9 KiB
C++
42 lines
1.9 KiB
C++
/*
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* Copyright (c) 2021, 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 <AK/NonnullOwnPtr.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/Storage/NVMe/NVMeController.h>
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#include <Kernel/Devices/Storage/NVMe/NVMeNameSpace.h>
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#include <Kernel/Devices/Storage/StorageManagement.h>
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namespace Kernel {
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UNMAP_AFTER_INIT ErrorOr<NonnullLockRefPtr<NVMeNameSpace>> NVMeNameSpace::try_create(NVMeController const& controller, Vector<NonnullLockRefPtr<NVMeQueue>> queues, u16 nsid, size_t storage_size, size_t lba_size)
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{
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auto device = TRY(DeviceManagement::try_create_device<NVMeNameSpace>(StorageDevice::LUNAddress { controller.controller_id(), nsid, 0 }, controller.hardware_relative_controller_id(), move(queues), storage_size, lba_size, nsid));
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return device;
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}
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UNMAP_AFTER_INIT NVMeNameSpace::NVMeNameSpace(LUNAddress logical_unit_number_address, u32 hardware_relative_controller_id, Vector<NonnullLockRefPtr<NVMeQueue>> queues, size_t max_addresable_block, size_t lba_size, u16 nsid)
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: StorageDevice(logical_unit_number_address, hardware_relative_controller_id, lba_size, max_addresable_block)
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, m_nsid(nsid)
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, m_queues(move(queues))
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{
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}
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void NVMeNameSpace::start_request(AsyncBlockDeviceRequest& request)
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{
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auto index = Processor::current_id();
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auto& queue = m_queues.at(index);
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// TODO: For now we support only IO transfers of size PAGE_SIZE (Going along with the current constraint in the block layer)
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// Eventually remove this constraint by using the PRP2 field in the submission struct and remove block layer constraint for NVMe driver.
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VERIFY(request.block_count() <= (PAGE_SIZE / block_size()));
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if (request.request_type() == AsyncBlockDeviceRequest::Read) {
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queue->read(request, m_nsid, request.block_index(), request.block_count());
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} else {
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queue->write(request, m_nsid, request.block_index(), request.block_count());
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}
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}
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}
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