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4744ccbff0
LUN address is essentially how people used to address SCSI devices back in the day we had these devices more in use. However, SCSI was taken as an abstraction layer for many Unix and Unix-like systems, so it still common to see LUN addresses in use. In Serenity, we don't really provide such abstraction layer, and therefore until now, we didn't use LUNs too. However (again), this changes, as we want to let users to address their devices under SysFS easily. LUNs make sense in that regard, because they can be easily adapted to different interfaces besides SCSI. For example, for legacy ATA hard drive being connected to the first IDE controller which was enumerated on the PCI bus, and then to the primary channel as slave device, the LUN address would be 0:0:1. To make this happen, we add unique ID number to each StorageController, which increments by 1 for each new instance of StorageController. Then, we adapt the ATA and NVMe devices to use these numbers and generate LUN in the construction time.
45 lines
2.2 KiB
C++
45 lines
2.2 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/NVMeController.h>
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#include <Kernel/Storage/StorageManagement.h>
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namespace Kernel {
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UNMAP_AFTER_INIT ErrorOr<NonnullRefPtr<NVMeNameSpace>> NVMeNameSpace::try_create(NVMeController const& controller, 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>(StorageDevice::LUNAddress { controller.controller_id(), nsid, 0 }, move(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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UNMAP_AFTER_INIT NVMeNameSpace::NVMeNameSpace(LUNAddress logical_unit_number_address, 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(logical_unit_number_address, 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(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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