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Kernel: Make kernel region allocators return KResultOr<NOP<Region>>

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This expands the reach of error propagation greatly throughout the
kernel. Sadly, it also exposes the fact that we're allocating (and
doing other fallible things) in constructors all over the place.

This patch doesn't attempt to address that of course. That's work for
our future selves.
This commit is contained in:
Andreas Kling 2021-09-06 01:36:14 +02:00
parent cb71a73708
commit 75564b4a5f
40 changed files with 173 additions and 193 deletions
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68
Kernel/Memory/MemoryManager.cpp
View file

@ -700,71 +700,46 @@ PageFaultResponse MemoryManager::handle_page_fault(PageFault const& fault)
return region->handle_fault(fault);
}
OwnPtr<Region> MemoryManager::allocate_contiguous_kernel_region(size_t size, StringView name, Region::Access access, Region::Cacheable cacheable)
KResultOr<NonnullOwnPtr<Region>> MemoryManager::allocate_contiguous_kernel_region(size_t size, StringView name, Region::Access access, Region::Cacheable cacheable)
{
VERIFY(!(size % PAGE_SIZE));
SpinlockLocker lock(kernel_page_directory().get_lock());
auto range_or_error = kernel_page_directory().range_allocator().try_allocate_anywhere(size);
if (range_or_error.is_error())
return {};
auto range = range_or_error.release_value();
auto maybe_vmobject = AnonymousVMObject::try_create_physically_contiguous_with_size(size);
if (maybe_vmobject.is_error()) {
kernel_page_directory().range_allocator().deallocate(range);
// FIXME: Would be nice to be able to return a KResultOr from here.
return {};
}
return allocate_kernel_region_with_vmobject(range, maybe_vmobject.release_value(), name, access, cacheable);
auto vmobject = TRY(AnonymousVMObject::try_create_physically_contiguous_with_size(size));
auto range = TRY(kernel_page_directory().range_allocator().try_allocate_anywhere(size));
return allocate_kernel_region_with_vmobject(range, move(vmobject), name, access, cacheable);
}
OwnPtr<Region> MemoryManager::allocate_kernel_region(size_t size, StringView name, Region::Access access, AllocationStrategy strategy, Region::Cacheable cacheable)
KResultOr<NonnullOwnPtr<Region>> MemoryManager::allocate_kernel_region(size_t size, StringView name, Region::Access access, AllocationStrategy strategy, Region::Cacheable cacheable)
{
VERIFY(!(size % PAGE_SIZE));
auto maybe_vm_object = AnonymousVMObject::try_create_with_size(size, strategy);
if (maybe_vm_object.is_error())
return {};
auto vmobject = TRY(AnonymousVMObject::try_create_with_size(size, strategy));
SpinlockLocker lock(kernel_page_directory().get_lock());
auto range_or_error = kernel_page_directory().range_allocator().try_allocate_anywhere(size);
if (range_or_error.is_error())
return {};
auto range = range_or_error.release_value();
return allocate_kernel_region_with_vmobject(range, maybe_vm_object.release_value(), name, access, cacheable);
auto range = TRY(kernel_page_directory().range_allocator().try_allocate_anywhere(size));
return allocate_kernel_region_with_vmobject(range, move(vmobject), name, access, cacheable);
}
OwnPtr<Region> MemoryManager::allocate_kernel_region(PhysicalAddress paddr, size_t size, StringView name, Region::Access access, Region::Cacheable cacheable)
KResultOr<NonnullOwnPtr<Region>> MemoryManager::allocate_kernel_region(PhysicalAddress paddr, size_t size, StringView name, Region::Access access, Region::Cacheable cacheable)
{
auto maybe_vm_object = AnonymousVMObject::try_create_for_physical_range(paddr, size);
if (maybe_vm_object.is_error())
return {};
VERIFY(!(size % PAGE_SIZE));
auto vmobject = TRY(AnonymousVMObject::try_create_for_physical_range(paddr, size));
SpinlockLocker lock(kernel_page_directory().get_lock());
auto range_or_error = kernel_page_directory().range_allocator().try_allocate_anywhere(size);
if (range_or_error.is_error())
return {};
auto range = range_or_error.release_value();
return allocate_kernel_region_with_vmobject(range, maybe_vm_object.release_value(), name, access, cacheable);
auto range = TRY(kernel_page_directory().range_allocator().try_allocate_anywhere(size));
return allocate_kernel_region_with_vmobject(range, move(vmobject), name, access, cacheable);
}
OwnPtr<Region> MemoryManager::allocate_kernel_region_with_vmobject(VirtualRange const& range, VMObject& vmobject, StringView name, Region::Access access, Region::Cacheable cacheable)
KResultOr<NonnullOwnPtr<Region>> MemoryManager::allocate_kernel_region_with_vmobject(VirtualRange const& range, VMObject& vmobject, StringView name, Region::Access access, Region::Cacheable cacheable)
{
auto maybe_region = Region::try_create_kernel_only(range, vmobject, 0, KString::try_create(name), access, cacheable);
if (maybe_region.is_error())
return {};
auto region = maybe_region.release_value();
auto region = TRY(Region::try_create_kernel_only(range, vmobject, 0, KString::try_create(name), access, cacheable));
if (!region->map(kernel_page_directory()))
return {};
return ENOMEM;
return region;
}
OwnPtr<Region> MemoryManager::allocate_kernel_region_with_vmobject(VMObject& vmobject, size_t size, StringView name, Region::Access access, Region::Cacheable cacheable)
KResultOr<NonnullOwnPtr<Region>> MemoryManager::allocate_kernel_region_with_vmobject(VMObject& vmobject, size_t size, StringView name, Region::Access access, Region::Cacheable cacheable)
{
VERIFY(!(size % PAGE_SIZE));
SpinlockLocker lock(kernel_page_directory().get_lock());
auto range_or_error = kernel_page_directory().range_allocator().try_allocate_anywhere(size);
if (range_or_error.is_error())
return {};
auto range = range_or_error.release_value();
auto range = TRY(kernel_page_directory().range_allocator().try_allocate_anywhere(size));
return allocate_kernel_region_with_vmobject(range, vmobject, name, access, cacheable);
}
@ -909,8 +884,13 @@ NonnullRefPtrVector<PhysicalPage> MemoryManager::allocate_contiguous_supervisor_
return {};
}
auto cleanup_region = MM.allocate_kernel_region(physical_pages[0].paddr(), PAGE_SIZE * count, "MemoryManager Allocation Sanitization", Region::Access::Read | Region::Access::Write);
fast_u32_fill((u32*)cleanup_region->vaddr().as_ptr(), 0, (PAGE_SIZE * count) / sizeof(u32));
{
auto region_or_error = MM.allocate_kernel_region(physical_pages[0].paddr(), PAGE_SIZE * count, "MemoryManager Allocation Sanitization", Region::Access::Read | Region::Access::Write);
if (region_or_error.is_error())
TODO();
auto cleanup_region = region_or_error.release_value();
fast_u32_fill((u32*)cleanup_region->vaddr().as_ptr(), 0, (PAGE_SIZE * count) / sizeof(u32));
}
m_system_memory_info.super_physical_pages_used += count;
return physical_pages;
}