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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
Download patch file Download diff file Expand all files Collapse all files

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;