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Kernel: Make contiguous VM objects use "user physical pages" by default

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If someone specifically wants contiguous memory in the low-physical-
address-for-DMA range ("super pages"), they can use the
allocate_dma_buffer_pages() helper.
This commit is contained in:
Andreas Kling 2022-02-11 12:20:26 +01:00
parent 5ff816abbf
commit 2ff9db0245
Notes: sideshowbarker 2024-07-17 22:41:14 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/2ff9db0245
3 changed files with 24 additions and 1 deletions
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2
Kernel/Memory/AnonymousVMObject.cpp
View file

@ -82,7 +82,7 @@ ErrorOr<NonnullRefPtr<AnonymousVMObject>> AnonymousVMObject::try_create_with_siz
ErrorOr<NonnullRefPtr<AnonymousVMObject>> AnonymousVMObject::try_create_physically_contiguous_with_size(size_t size)
{
auto contiguous_physical_pages = TRY(MM.allocate_contiguous_supervisor_physical_pages(size));
auto contiguous_physical_pages = TRY(MM.allocate_contiguous_user_physical_pages(size));
auto new_physical_pages = TRY(FixedArray<RefPtr<PhysicalPage>>::try_create(contiguous_physical_pages.span()));

22
Kernel/Memory/MemoryManager.cpp
View file

@ -954,6 +954,28 @@ ErrorOr<NonnullRefPtr<PhysicalPage>> MemoryManager::allocate_user_physical_page(
return page.release_nonnull();
}
ErrorOr<NonnullRefPtrVector<PhysicalPage>> MemoryManager::allocate_contiguous_user_physical_pages(size_t size)
{
VERIFY(!(size % PAGE_SIZE));
SpinlockLocker lock(s_mm_lock);
size_t page_count = ceil_div(size, static_cast<size_t>(PAGE_SIZE));
for (auto& physical_region : m_user_physical_regions) {
auto physical_pages = physical_region.take_contiguous_free_pages(page_count);
if (!physical_pages.is_empty()) {
{
auto cleanup_region = TRY(MM.allocate_kernel_region(physical_pages[0].paddr(), PAGE_SIZE * page_count, "MemoryManager Allocation Sanitization", Region::Access::Read | Region::Access::Write));
memset(cleanup_region->vaddr().as_ptr(), 0, PAGE_SIZE * page_count);
}
m_system_memory_info.user_physical_pages_used += page_count;
return physical_pages;
}
}
dmesgln("MM: no contiguous user physical pages available");
return ENOMEM;
}
ErrorOr<NonnullRefPtrVector<PhysicalPage>> MemoryManager::allocate_contiguous_supervisor_physical_pages(size_t size)
{
VERIFY(!(size % PAGE_SIZE));

1
Kernel/Memory/MemoryManager.h
View file

@ -174,6 +174,7 @@ public:
ErrorOr<NonnullRefPtr<PhysicalPage>> allocate_user_physical_page(ShouldZeroFill = ShouldZeroFill::Yes, bool* did_purge = nullptr);
ErrorOr<NonnullRefPtr<PhysicalPage>> allocate_supervisor_physical_page();
ErrorOr<NonnullRefPtrVector<PhysicalPage>> allocate_contiguous_supervisor_physical_pages(size_t size);
ErrorOr<NonnullRefPtrVector<PhysicalPage>> allocate_contiguous_user_physical_pages(size_t size);
void deallocate_physical_page(PhysicalAddress);
ErrorOr<NonnullOwnPtr<Region>> allocate_contiguous_kernel_region(size_t, StringView name, Region::Access access, Region::Cacheable = Region::Cacheable::Yes);