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Kernel/Graphics: Allocate 16 MiB framebuffer if failed allocating larger

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We try our best to ensure a DisplayConnector initialization succeeds,
and this makes the Intel driver to work again, because if we can't
allocate a Region for the whole PCI BAR mapped region, then we will try
to allocate a Region with 16 MiB window size, so it doesn't eat the
entire Kernel-allocated virtual memory space.
This commit is contained in:
Liav A 2022-12-22 11:35:35 +02:00 • committed by Andrew Kaster
parent 25bb293629
commit 7625f7db73
2 changed files with 29 additions and 12 deletions
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37
Kernel/Graphics/DisplayConnector.cpp
View file

@ -74,6 +74,23 @@ void DisplayConnector::will_be_destroyed()
before_will_be_destroyed_remove_from_device_management();
}
ErrorOr<void> DisplayConnector::allocate_framebuffer_resources(size_t rounded_size)
{
VERIFY((rounded_size % PAGE_SIZE) == 0);
if (!m_framebuffer_at_arbitrary_physical_range) {
VERIFY(m_framebuffer_address.value().page_base() == m_framebuffer_address.value());
m_shared_framebuffer_vmobject = TRY(Memory::SharedFramebufferVMObject::try_create_for_physical_range(m_framebuffer_address.value(), rounded_size));
m_framebuffer_region = TRY(MM.allocate_kernel_region(m_framebuffer_address.value().page_base(), rounded_size, "Framebuffer"sv, Memory::Region::Access::ReadWrite));
} else {
m_shared_framebuffer_vmobject = TRY(Memory::SharedFramebufferVMObject::try_create_at_arbitrary_physical_range(rounded_size));
m_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(m_shared_framebuffer_vmobject->real_writes_framebuffer_vmobject(), rounded_size, "Framebuffer"sv, Memory::Region::Access::ReadWrite));
}
m_framebuffer_data = m_framebuffer_region->vaddr().as_ptr();
m_fake_writes_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(m_shared_framebuffer_vmobject->fake_writes_framebuffer_vmobject(), rounded_size, "Fake Writes Framebuffer"sv, Memory::Region::Access::ReadWrite));
return {};
}
ErrorOr<void> DisplayConnector::after_inserting()
{
after_inserting_add_to_device_management();
@ -99,19 +116,17 @@ ErrorOr<void> DisplayConnector::after_inserting()
m_symlink_sysfs_component.clear();
});
auto rounded_size = TRY(Memory::page_round_up(m_framebuffer_resource_size));
if (!m_framebuffer_at_arbitrary_physical_range) {
VERIFY(m_framebuffer_address.value().page_base() == m_framebuffer_address.value());
m_shared_framebuffer_vmobject = TRY(Memory::SharedFramebufferVMObject::try_create_for_physical_range(m_framebuffer_address.value(), rounded_size));
m_framebuffer_region = TRY(MM.allocate_kernel_region(m_framebuffer_address.value().page_base(), rounded_size, "Framebuffer"sv, Memory::Region::Access::ReadWrite));
if (auto result_or_error = Memory::page_round_up(m_framebuffer_resource_size); result_or_error.is_error()) {
// NOTE: The amount of framebuffer resource being specified is erroneous, then default to 16 MiB.
TRY(allocate_framebuffer_resources(16 * MiB));
m_framebuffer_resource_size = 16 * MiB;
} else {
m_shared_framebuffer_vmobject = TRY(Memory::SharedFramebufferVMObject::try_create_at_arbitrary_physical_range(rounded_size));
m_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(m_shared_framebuffer_vmobject->real_writes_framebuffer_vmobject(), rounded_size, "Framebuffer"sv, Memory::Region::Access::ReadWrite));
if (auto allocation_result = allocate_framebuffer_resources(result_or_error.release_value()); allocation_result.is_error()) {
// NOTE: The amount of framebuffer resource being specified is too big, use 16 MiB just to get going.
TRY(allocate_framebuffer_resources(16 * MiB));
m_framebuffer_resource_size = 16 * MiB;
}
}
m_framebuffer_data = m_framebuffer_region->vaddr().as_ptr();
m_fake_writes_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(m_shared_framebuffer_vmobject->fake_writes_framebuffer_vmobject(), rounded_size, "Fake Writes Framebuffer"sv, Memory::Region::Access::ReadWrite));
clean_from_device_management.disarm();
clean_from_sysfs_display_connector_device_directory.disarm();

4
Kernel/Graphics/DisplayConnector.h
View file

@ -148,6 +148,8 @@ private:
virtual void will_be_destroyed() override;
virtual ErrorOr<void> after_inserting() override;
ErrorOr<void> allocate_framebuffer_resources(size_t rounded_size);
ErrorOr<bool> ioctl_requires_ownership(unsigned request) const;
OwnPtr<Memory::Region> m_framebuffer_region;
@ -159,7 +161,7 @@ private:
protected:
Optional<PhysicalAddress> const m_framebuffer_address;
size_t const m_framebuffer_resource_size;
size_t m_framebuffer_resource_size;
private:
LockRefPtr<Memory::SharedFramebufferVMObject> m_shared_framebuffer_vmobject;