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Kernel/NVMe: Add initial NVMe driver support

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Add a basic NVMe driver support to serenity
based on NVMe spec 1.4.

The driver can support multiple NVMe drives (subsystems).
But in a NVMe drive, the driver can support one controller
with multiple namespaces.

Each core will get a separate NVMe Queue.
As the system lacks MSI support, PIN based interrupts are
used for IO.

Tested the NVMe support by replacing IDE driver
with the NVMe driver :^)
This commit is contained in:
Pankaj Raghav 2021-12-16 20:37:54 +05:30 • committed by Andreas Kling
parent 602b35aa62
commit e99fafb683
13 changed files with 946 additions and 0 deletions
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47
Kernel/Storage/NVMe/NVMeNameSpace.cpp Normal file
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/*
* Copyright (c) 2021, Pankaj R <pankydev8@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "NVMeNameSpace.h"
#include <AK/NonnullOwnPtr.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Storage/NVMe/NVMeNameSpace.h>
#include <Kernel/Storage/StorageManagement.h>
namespace Kernel {
ErrorOr<NonnullRefPtr<NVMeNameSpace>> NVMeNameSpace::try_create(NonnullRefPtrVector<NVMeQueue> queues, u8 controller_id, u16 nsid, size_t storage_size, size_t lba_size)
{
auto minor_number = StorageManagement::generate_storage_minor_number();
auto major_number = StorageManagement::storage_type_major_number();
auto device_name = String::formatted("nvme{:d}n{:d}", controller_id, nsid);
auto device_name_kstring = KString::must_create(device_name.view());
auto device = TRY(DeviceManagement::try_create_device<NVMeNameSpace>(queues, storage_size, lba_size, major_number.value(), minor_number.value(), nsid, move(device_name_kstring)));
return device;
}
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)
: StorageDevice(major_number, minor_number, lba_size, max_addresable_block, move(dev_name))
, m_nsid(nsid)
, m_queues(queues)
{
}
void NVMeNameSpace::start_request(AsyncBlockDeviceRequest& request)
{
auto index = Processor::current_id();
auto& queue = m_queues.at(index);
// TODO: For now we support only IO transfers of size PAGE_SIZE (Going along with the current constraint in the block layer)
// Eventually remove this constraint by using the PRP2 field in the submission struct and remove block layer constraint for NVMe driver.
VERIFY(request.block_count() <= (PAGE_SIZE / block_size()));
if (request.request_type() == AsyncBlockDeviceRequest::Read) {
queue.read(request, m_nsid, request.block_index(), request.block_count());
} else {
queue.write(request, m_nsid, request.block_index(), request.block_count());
}
}
}