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Kernel: Make allocate_contiguous_supervisor_physical_pages OOM-fallible

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This commit is contained in:
Idan Horowitz 2022-01-28 16:23:24 +02:00
parent 956824afe2
commit 4d2f1a05ec
3 changed files with 7 additions and 16 deletions
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4
Kernel/Memory/AnonymousVMObject.cpp
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@ -81,9 +81,7 @@ ErrorOr<NonnullRefPtr<AnonymousVMObject>> AnonymousVMObject::try_create_with_siz
ErrorOr<NonnullRefPtr<AnonymousVMObject>> AnonymousVMObject::try_create_physically_contiguous_with_size(size_t size) ErrorOr<NonnullRefPtr<AnonymousVMObject>> AnonymousVMObject::try_create_physically_contiguous_with_size(size_t size)
{ {
auto contiguous_physical_pages = MM.allocate_contiguous_supervisor_physical_pages(size); auto contiguous_physical_pages = TRY(MM.allocate_contiguous_supervisor_physical_pages(size));
if (contiguous_physical_pages.is_empty())
return ENOMEM;
auto new_physical_pages = TRY(FixedArray<RefPtr<PhysicalPage>>::try_create(contiguous_physical_pages.span())); auto new_physical_pages = TRY(FixedArray<RefPtr<PhysicalPage>>::try_create(contiguous_physical_pages.span()));

17
Kernel/Memory/MemoryManager.cpp
View file

@ -759,12 +759,9 @@ ErrorOr<NonnullOwnPtr<Memory::Region>> MemoryManager::allocate_dma_buffer_page(S
ErrorOr<NonnullOwnPtr<Memory::Region>> MemoryManager::allocate_dma_buffer_pages(size_t size, StringView name, Memory::Region::Access access, NonnullRefPtrVector<Memory::PhysicalPage>& dma_buffer_pages) ErrorOr<NonnullOwnPtr<Memory::Region>> MemoryManager::allocate_dma_buffer_pages(size_t size, StringView name, Memory::Region::Access access, NonnullRefPtrVector<Memory::PhysicalPage>& dma_buffer_pages)
{ {
VERIFY(!(size % PAGE_SIZE)); VERIFY(!(size % PAGE_SIZE));
dma_buffer_pages = allocate_contiguous_supervisor_physical_pages(size); dma_buffer_pages = TRY(allocate_contiguous_supervisor_physical_pages(size));
if (dma_buffer_pages.is_empty())
return ENOMEM;
// Do not enable Cache for this region as physical memory transfers are performed (Most architectures have this behaviour by default) // Do not enable Cache for this region as physical memory transfers are performed (Most architectures have this behaviour by default)
auto region_or_error = allocate_kernel_region(dma_buffer_pages.first().paddr(), size, name, access, Region::Cacheable::No); return allocate_kernel_region(dma_buffer_pages.first().paddr(), size, name, access, Region::Cacheable::No);
return region_or_error;
} }
ErrorOr<NonnullOwnPtr<Memory::Region>> MemoryManager::allocate_dma_buffer_pages(size_t size, StringView name, Memory::Region::Access access) ErrorOr<NonnullOwnPtr<Memory::Region>> MemoryManager::allocate_dma_buffer_pages(size_t size, StringView name, Memory::Region::Access access)
@ -939,7 +936,7 @@ RefPtr<PhysicalPage> MemoryManager::allocate_user_physical_page(ShouldZeroFill s
return page; return page;
} }
NonnullRefPtrVector<PhysicalPage> MemoryManager::allocate_contiguous_supervisor_physical_pages(size_t size) ErrorOr<NonnullRefPtrVector<PhysicalPage>> MemoryManager::allocate_contiguous_supervisor_physical_pages(size_t size)
{ {
VERIFY(!(size % PAGE_SIZE)); VERIFY(!(size % PAGE_SIZE));
SpinlockLocker lock(s_mm_lock); SpinlockLocker lock(s_mm_lock);
@ -948,15 +945,11 @@ NonnullRefPtrVector<PhysicalPage> MemoryManager::allocate_contiguous_supervisor_
if (physical_pages.is_empty()) { if (physical_pages.is_empty()) {
dmesgln("MM: no super physical pages available"); dmesgln("MM: no super physical pages available");
VERIFY_NOT_REACHED(); return ENOMEM;
return {};
} }
{ {
auto region_or_error = MM.allocate_kernel_region(physical_pages[0].paddr(), PAGE_SIZE * count, "MemoryManager Allocation Sanitization", Region::Access::Read | Region::Access::Write); auto cleanup_region = TRY(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();
memset(cleanup_region->vaddr().as_ptr(), 0, PAGE_SIZE * count); memset(cleanup_region->vaddr().as_ptr(), 0, PAGE_SIZE * count);
} }
m_system_memory_info.super_physical_pages_used += count; m_system_memory_info.super_physical_pages_used += count;

2
Kernel/Memory/MemoryManager.h
View file

@ -173,7 +173,7 @@ public:
NonnullRefPtr<PhysicalPage> allocate_committed_user_physical_page(Badge<CommittedPhysicalPageSet>, ShouldZeroFill = ShouldZeroFill::Yes); NonnullRefPtr<PhysicalPage> allocate_committed_user_physical_page(Badge<CommittedPhysicalPageSet>, ShouldZeroFill = ShouldZeroFill::Yes);
RefPtr<PhysicalPage> allocate_user_physical_page(ShouldZeroFill = ShouldZeroFill::Yes, bool* did_purge = nullptr); RefPtr<PhysicalPage> allocate_user_physical_page(ShouldZeroFill = ShouldZeroFill::Yes, bool* did_purge = nullptr);
RefPtr<PhysicalPage> allocate_supervisor_physical_page(); RefPtr<PhysicalPage> allocate_supervisor_physical_page();
NonnullRefPtrVector<PhysicalPage> allocate_contiguous_supervisor_physical_pages(size_t size); ErrorOr<NonnullRefPtrVector<PhysicalPage>> allocate_contiguous_supervisor_physical_pages(size_t size);
void deallocate_physical_page(PhysicalAddress); void deallocate_physical_page(PhysicalAddress);
ErrorOr<NonnullOwnPtr<Region>> allocate_contiguous_kernel_region(size_t, StringView name, Region::Access access, Region::Cacheable = Region::Cacheable::Yes); ErrorOr<NonnullOwnPtr<Region>> allocate_contiguous_kernel_region(size_t, StringView name, Region::Access access, Region::Cacheable = Region::Cacheable::Yes);