Kernel: Convert rw_dma_page to NonnullRefPtr in NVMeQueue

Propagate error if the rw_dma_page is NULL in try_create and use
relase_nonnull to convert RefPtr to NonnullRefPtr before passing it to
the NVMeQueue.

Kernel/Storage/NVMe/NVMeInterruptQueue.cpp

@@ -11,7 +11,7 @@
 
 namespace Kernel {
 
-UNMAP_AFTER_INIT NVMeInterruptQueue::NVMeInterruptQueue(PCI::Device& device, NonnullOwnPtr<Memory::Region> rw_dma_region, Memory::PhysicalPage const& rw_dma_page, u16 qid, u8 irq, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, OwnPtr<Memory::Region> sq_dma_region, Memory::TypedMapping<DoorbellRegister volatile> db_regs)
+UNMAP_AFTER_INIT NVMeInterruptQueue::NVMeInterruptQueue(PCI::Device& device, NonnullOwnPtr<Memory::Region> rw_dma_region, NonnullRefPtr<Memory::PhysicalPage> rw_dma_page, u16 qid, u8 irq, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, OwnPtr<Memory::Region> sq_dma_region, Memory::TypedMapping<DoorbellRegister volatile> db_regs)
     : NVMeQueue(move(rw_dma_region), rw_dma_page, qid, q_depth, move(cq_dma_region), move(sq_dma_region), move(db_regs))
     , PCIIRQHandler(device, irq)
 {

Kernel/Storage/NVMe/NVMeInterruptQueue.h

@@ -14,7 +14,7 @@ namespace Kernel {
 class NVMeInterruptQueue : public NVMeQueue
     , public PCIIRQHandler {
 public:
-    NVMeInterruptQueue(PCI::Device& device, NonnullOwnPtr<Memory::Region> rw_dma_region, Memory::PhysicalPage const& rw_dma_page, u16 qid, u8 irq, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, OwnPtr<Memory::Region> sq_dma_region, Memory::TypedMapping<DoorbellRegister volatile> db_regs);
+    NVMeInterruptQueue(PCI::Device& device, NonnullOwnPtr<Memory::Region> rw_dma_region, NonnullRefPtr<Memory::PhysicalPage> rw_dma_page, u16 qid, u8 irq, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, OwnPtr<Memory::Region> sq_dma_region, Memory::TypedMapping<DoorbellRegister volatile> db_regs);
     void submit_sqe(NVMeSubmission& submission) override;
     virtual ~NVMeInterruptQueue() override {};
     virtual StringView purpose() const override { return "NVMe"sv; };

Kernel/Storage/NVMe/NVMePollQueue.cpp

@@ -10,7 +10,7 @@
 #include <Kernel/Storage/NVMe/NVMePollQueue.h>
 
 namespace Kernel {
-UNMAP_AFTER_INIT NVMePollQueue::NVMePollQueue(NonnullOwnPtr<Memory::Region> rw_dma_region, Memory::PhysicalPage const& rw_dma_page, u16 qid, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, OwnPtr<Memory::Region> sq_dma_region, Memory::TypedMapping<DoorbellRegister volatile> db_regs)
+UNMAP_AFTER_INIT NVMePollQueue::NVMePollQueue(NonnullOwnPtr<Memory::Region> rw_dma_region, NonnullRefPtr<Memory::PhysicalPage> rw_dma_page, u16 qid, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, OwnPtr<Memory::Region> sq_dma_region, Memory::TypedMapping<DoorbellRegister volatile> db_regs)
     : NVMeQueue(move(rw_dma_region), rw_dma_page, qid, q_depth, move(cq_dma_region), move(sq_dma_region), move(db_regs))
 {
 }

Kernel/Storage/NVMe/NVMePollQueue.h

@@ -12,7 +12,7 @@ namespace Kernel {
 
 class NVMePollQueue : public NVMeQueue {
 public:
-    NVMePollQueue(NonnullOwnPtr<Memory::Region> rw_dma_region, Memory::PhysicalPage const& rw_dma_page, u16 qid, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, OwnPtr<Memory::Region> sq_dma_region, Memory::TypedMapping<DoorbellRegister volatile> db_regs);
+    NVMePollQueue(NonnullOwnPtr<Memory::Region> rw_dma_region, NonnullRefPtr<Memory::PhysicalPage> rw_dma_page, u16 qid, u32 q_depth, OwnPtr<Memory::Region> cq_dma_region, OwnPtr<Memory::Region> sq_dma_region, Memory::TypedMapping<DoorbellRegister volatile> db_regs);
     void submit_sqe(NVMeSubmission& submission) override;
     virtual ~NVMePollQueue() override {};
 

Kernel/Storage/NVMe/NVMeQueue.cpp

@@ -17,11 +17,16 @@ ErrorOr<NonnullLockRefPtr<NVMeQueue>> NVMeQueue::try_create(NVMeController& devi
     // Note: Allocate DMA region for RW operation. For now the requests don't exceed more than 4096 bytes (Storage device takes care of it)
     RefPtr<Memory::PhysicalPage> rw_dma_page;
     auto rw_dma_region = TRY(MM.allocate_dma_buffer_page("NVMe Queue Read/Write DMA"sv, Memory::Region::Access::ReadWrite, rw_dma_page));
+
+    if (rw_dma_page.is_null())
+        return ENOMEM;
+
     if (queue_type == QueueType::Polled) {
-        auto queue = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) NVMePollQueue(move(rw_dma_region), *rw_dma_page, qid, q_depth, move(cq_dma_region), move(sq_dma_region), move(db_regs))));
+        auto queue = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) NVMePollQueue(move(rw_dma_region), rw_dma_page.release_nonnull(), qid, q_depth, move(cq_dma_region), move(sq_dma_region), move(db_regs))));
         return queue;
     }
-    auto queue = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) NVMeInterruptQueue(device, move(rw_dma_region), *rw_dma_page, qid, irq, q_depth, move(cq_dma_region), move(sq_dma_region), move(db_regs))));
+
+    auto queue = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) NVMeInterruptQueue(device, move(rw_dma_region), rw_dma_page.release_nonnull(), qid, irq, q_depth, move(cq_dma_region), move(sq_dma_region), move(db_regs))));
     return queue;
 }