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https://github.com/RGBCube/serenity
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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.
41 lines
1.3 KiB
C++
41 lines
1.3 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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#pragma once
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#include "AK/kmalloc.h"
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#include <AK/NonnullRefPtr.h>
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#include <AK/NonnullRefPtrVector.h>
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#include <AK/OwnPtr.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/Types.h>
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#include <Kernel/Locking/Spinlock.h>
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#include <Kernel/Storage/NVMe/NVMeDefinitions.h>
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#include <Kernel/Storage/NVMe/NVMeQueue.h>
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#include <Kernel/Storage/StorageDevice.h>
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namespace Kernel {
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class NVMeController;
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class NVMeNameSpace : public StorageDevice {
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friend class DeviceManagement;
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public:
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static ErrorOr<NonnullRefPtr<NVMeNameSpace>> try_create(NVMeController const&, NonnullRefPtrVector<NVMeQueue> queues, u8 controller_id, u16 nsid, size_t storage_size, size_t lba_size);
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CommandSet command_set() const override { return CommandSet::NVMe; };
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void start_request(AsyncBlockDeviceRequest& request) override;
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private:
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NVMeNameSpace(LUNAddress, NonnullRefPtrVector<NVMeQueue> queues, size_t storage_size, size_t lba_size, size_t major_number, size_t minor_number, u16 nsid, NonnullOwnPtr<KString> early_device_name);
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virtual InterfaceType interface_type() const override { return InterfaceType::NVMe; }
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u16 m_nsid;
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NonnullRefPtrVector<NVMeQueue> m_queues;
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};
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}
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