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46 lines
2 KiB
C++
46 lines
2 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 "NVMeNameSpace.h"
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#include <AK/NonnullOwnPtr.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Storage/NVMe/NVMeNameSpace.h>
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#include <Kernel/Storage/StorageManagement.h>
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namespace Kernel {
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ErrorOr<NonnullRefPtr<NVMeNameSpace>> NVMeNameSpace::try_create(NonnullRefPtrVector<NVMeQueue> queues, u8 controller_id, u16 nsid, size_t storage_size, size_t lba_size)
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{
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auto minor_number = StorageManagement::generate_storage_minor_number();
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auto major_number = StorageManagement::storage_type_major_number();
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auto device_name_kstring = TRY(KString::formatted("nvme{:d}n{:d}", controller_id, nsid));
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auto device = TRY(DeviceManagement::try_create_device<NVMeNameSpace>(queues, storage_size, lba_size, major_number.value(), minor_number.value(), nsid, move(device_name_kstring)));
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return device;
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}
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NVMeNameSpace::NVMeNameSpace(NonnullRefPtrVector<NVMeQueue> queues, size_t max_addresable_block, size_t lba_size, size_t major_number, size_t minor_number, u16 nsid, NonnullOwnPtr<KString> dev_name)
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: StorageDevice(major_number, minor_number, lba_size, max_addresable_block, move(dev_name))
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, m_nsid(nsid)
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, m_queues(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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