Kernel/NVMe: Add try_create() to NVMe{Poll|Interrupt}Queue

NVMe{Poll|Interrupt}Queue don't have a try_create() method. Add one to
keep it consistent with how we create objects. Also this commit is in
preparation to moving any initialization related code out of the
constructor.

Kernel/Storage/NVMe/NVMeInterruptQueue.cpp

@@ -11,6 +11,11 @@
 
 namespace Kernel {
 
+ErrorOr<NonnullLockRefPtr<NVMeInterruptQueue>> NVMeInterruptQueue::try_create(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)
+{
+    return 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))));
+}
+
 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

@@ -14,11 +14,14 @@ namespace Kernel {
 class NVMeInterruptQueue : public NVMeQueue
     , public PCIIRQHandler {
 public:
-    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);
+    static ErrorOr<NonnullLockRefPtr<NVMeInterruptQueue>> try_create(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; };
 
+protected:
+    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);
+
 private:
     virtual void complete_current_request(u16 cmdid, u16 status) override;
     bool handle_irq(RegisterState const&) override;

Kernel/Storage/NVMe/NVMePollQueue.cpp

@@ -10,6 +10,12 @@
 #include <Kernel/Storage/NVMe/NVMePollQueue.h>
 
 namespace Kernel {
+
+ErrorOr<NonnullLockRefPtr<NVMePollQueue>> NVMePollQueue::try_create(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)
+{
+    return 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))));
+}
+
 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

@@ -12,10 +12,13 @@ namespace Kernel {
 
 class NVMePollQueue : public NVMeQueue {
 public:
-    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);
+    static ErrorOr<NonnullLockRefPtr<NVMePollQueue>> try_create(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 {};
 
+protected:
+    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);
+
 private:
     virtual void complete_current_request(u16 cmdid, u16 status) override;
 };

Kernel/Storage/NVMe/NVMeQueue.cpp

@@ -22,11 +22,11 @@ ErrorOr<NonnullLockRefPtr<NVMeQueue>> NVMeQueue::try_create(NVMeController& devi
         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.release_nonnull(), qid, q_depth, move(cq_dma_region), move(sq_dma_region), move(db_regs))));
+        auto queue = NVMePollQueue::try_create(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.release_nonnull(), qid, irq, q_depth, move(cq_dma_region), move(sq_dma_region), move(db_regs))));
+    auto queue = NVMeInterruptQueue::try_create(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;
 }