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Kernel: Fix NVMe register access

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We need to use the volatile keyword when mapping the device registers,
or the compiler may optimize access, which lead to this QEMU error:

pci_nvme_ub_mmiord_toosmall in nvme_mmio_read: MMIO read smaller than
32-bits, offset=0x0
This commit is contained in:
Tom 2022-01-01 13:51:39 -07:00 • committed by Brian Gianforcaro
parent c4b78bee45
commit d1e7b69004
4 changed files with 9 additions and 9 deletions
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6
Kernel/Storage/NVMe/NVMeController.cpp
View file

@ -45,7 +45,7 @@ ErrorOr<void> NVMeController::initialize()
// Map only until doorbell register for the controller
// Queues will individually map the doorbell register respectively
m_controller_regs = Memory::map_typed_writable<ControllerRegister>(PhysicalAddress(m_bar));
m_controller_regs = Memory::map_typed_writable<volatile ControllerRegister>(PhysicalAddress(m_bar));
calculate_doorbell_stride();
TRY(create_admin_queue(irq));
@ -250,7 +250,7 @@ ErrorOr<void> NVMeController::create_admin_queue(u8 irq)
auto buffer = TRY(MM.allocate_dma_buffer_pages(sq_size, "Admin SQ queue", Memory::Region::Access::ReadWrite, sq_dma_pages));
sq_dma_region = move(buffer);
}
auto doorbell_regs = Memory::map_typed_writable<DoorbellRegister>(PhysicalAddress(m_bar + REG_SQ0TDBL_START));
auto doorbell_regs = Memory::map_typed_writable<volatile DoorbellRegister>(PhysicalAddress(m_bar + REG_SQ0TDBL_START));
m_admin_queue = TRY(NVMeQueue::try_create(0, irq, qdepth, move(cq_dma_region), cq_dma_pages, move(sq_dma_region), sq_dma_pages, move(doorbell_regs)));
@ -317,7 +317,7 @@ ErrorOr<void> NVMeController::create_io_queue(u8 irq, u8 qid)
}
auto queue_doorbell_offset = REG_SQ0TDBL_START + ((2 * qid) * (4 << m_dbl_stride));
auto doorbell_regs = Memory::map_typed_writable<DoorbellRegister>(PhysicalAddress(m_bar + queue_doorbell_offset));
auto doorbell_regs = Memory::map_typed_writable<volatile DoorbellRegister>(PhysicalAddress(m_bar + queue_doorbell_offset));
m_queues.append(TRY(NVMeQueue::try_create(qid, irq, IO_QUEUE_SIZE, move(cq_dma_region), cq_dma_pages, move(sq_dma_region), sq_dma_pages, move(doorbell_regs))));
m_queues.last().enable_interrupts();

2
Kernel/Storage/NVMe/NVMeController.h
View file

@ -69,7 +69,7 @@ private:
RefPtr<NVMeQueue> m_admin_queue;
NonnullRefPtrVector<NVMeQueue> m_queues;
NonnullRefPtrVector<NVMeNameSpace> m_namespaces;
Memory::TypedMapping<ControllerRegister> m_controller_regs;
Memory::TypedMapping<volatile ControllerRegister> m_controller_regs;
bool m_admin_queue_ready { false };
size_t m_device_count {};
u32 m_bar;

4
Kernel/Storage/NVMe/NVMeQueue.cpp
View file

@ -13,14 +13,14 @@
namespace Kernel {
ErrorOr<NonnullRefPtr<NVMeQueue>> NVMeQueue::try_create(u16 qid, u8 irq, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> cq_dma_page, OwnPtr<Memory::Region> sq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> sq_dma_page, Memory::TypedMapping<DoorbellRegister> db_regs)
ErrorOr<NonnullRefPtr<NVMeQueue>> NVMeQueue::try_create(u16 qid, u8 irq, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> cq_dma_page, OwnPtr<Memory::Region> sq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> sq_dma_page, Memory::TypedMapping<volatile DoorbellRegister> db_regs)
{
auto queue = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) NVMeQueue(qid, irq, q_depth, move(cq_dma_region), cq_dma_page, move(sq_dma_region), sq_dma_page, move(db_regs))));
TRY(queue->create());
return queue;
}
NVMeQueue::NVMeQueue(u16 qid, u8 irq, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> cq_dma_page, OwnPtr<Memory::Region> sq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> sq_dma_page, Memory::TypedMapping<DoorbellRegister> db_regs)
NVMeQueue::NVMeQueue(u16 qid, u8 irq, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> cq_dma_page, OwnPtr<Memory::Region> sq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> sq_dma_page, Memory::TypedMapping<volatile DoorbellRegister> db_regs)
: IRQHandler(irq)
, m_qid(qid)
, m_admin_queue(qid == 0)

6
Kernel/Storage/NVMe/NVMeQueue.h
View file

@ -29,9 +29,9 @@ class AsyncBlockDeviceRequest;
class NVMeQueue : public IRQHandler
, public RefCounted<NVMeQueue> {
public:
static ErrorOr<NonnullRefPtr<NVMeQueue>> try_create(u16 qid, u8 irq, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> cq_dma_page, OwnPtr<Memory::Region> sq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> sq_dma_page, Memory::TypedMapping<DoorbellRegister> db_regs);
static ErrorOr<NonnullRefPtr<NVMeQueue>> try_create(u16 qid, u8 irq, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> cq_dma_page, OwnPtr<Memory::Region> sq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> sq_dma_page, Memory::TypedMapping<volatile DoorbellRegister> db_regs);
ErrorOr<void> create();
explicit NVMeQueue(u16 qid, u8 irq, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> cq_dma_page, OwnPtr<Memory::Region> sq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> sq_dma_page, Memory::TypedMapping<DoorbellRegister> db_regs);
explicit NVMeQueue(u16 qid, u8 irq, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> cq_dma_page, OwnPtr<Memory::Region> sq_dma_region, NonnullRefPtrVector<Memory::PhysicalPage> sq_dma_page, Memory::TypedMapping<volatile DoorbellRegister> db_regs);
bool is_admin_queue() { return m_admin_queue; };
bool handle_irq(const RegisterState&) override;
void submit_sqe(struct NVMeSubmission&);
@ -73,7 +73,7 @@ private:
NonnullRefPtrVector<Memory::PhysicalPage> m_sq_dma_page;
Span<NVMeCompletion> m_cqe_array;
OwnPtr<Memory::Region> m_rw_dma_region;
Memory::TypedMapping<DoorbellRegister> m_db_regs;
Memory::TypedMapping<volatile DoorbellRegister> m_db_regs;
RefPtr<Memory::PhysicalPage> m_rw_dma_page;
Spinlock m_request_lock;
RefPtr<AsyncBlockDeviceRequest> m_current_request;