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Kernel/Graphics: Choose VMObject considering enabled state when mmaping

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When mmaping a Framebuffer from userspace, we need to check whether the
framebuffer device is actually enabled (e.g. graphical mode is being
used) or a textual VirtualConsole is active.

Considering the above state, we mmap the right VMObject to ensure we
don't have graphical artifacts if we change the resolution from
DisplaySettings, changed to textual mode and after the resolution change
was reverted, we will see the Desktop reappearing even though we are
still in textual mode.
This commit is contained in:
Liav A 2021-05-20 21:28:18 +03:00 committed by Andreas Kling
parent 87f8f892d8
commit db268efa69
Notes: sideshowbarker 2024-07-18 17:39:04 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/db268efa693
Pull-request: https://github.com/SerenityOS/serenity/pull/7258
Issue: https://github.com/SerenityOS/serenity/issues/7241
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/tomuta
2 changed files with 12 additions and 1 deletions
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11
Kernel/Graphics/FramebufferDevice.cpp
View File

@ -22,6 +22,7 @@ namespace Kernel {
KResultOr<Region*> FramebufferDevice::mmap(Process& process, FileDescription&, const Range& range, u64 offset, int prot, bool shared)
{
ScopedSpinLock lock(m_activation_lock);
REQUIRE_PROMISE(video);
if (!shared)
return ENODEV;
@ -40,9 +41,15 @@ KResultOr<Region*> FramebufferDevice::mmap(Process& process, FileDescription&, c
m_real_framebuffer_region = MM.allocate_kernel_region_with_vmobject(*m_real_framebuffer_vmobject, page_round_up(framebuffer_size_in_bytes()), "Framebuffer", Region::Access::Read | Region::Access::Write);
m_swapped_framebuffer_region = MM.allocate_kernel_region_with_vmobject(*m_swapped_framebuffer_vmobject, page_round_up(framebuffer_size_in_bytes()), "Framebuffer Swap (Blank)", Region::Access::Read | Region::Access::Write);
RefPtr<VMObject> chosen_vmobject;
if (m_graphical_writes_enabled) {
chosen_vmobject = m_real_framebuffer_vmobject;
} else {
chosen_vmobject = m_swapped_framebuffer_vmobject;
}
auto result = process.space().allocate_region_with_vmobject(
range,
vmobject.release_nonnull(),
chosen_vmobject.release_nonnull(),
0,
"Framebuffer",
prot,
@ -62,6 +69,7 @@ void FramebufferDevice::dectivate_writes()
auto vmobject = m_swapped_framebuffer_vmobject;
m_userspace_framebuffer_region->set_vmobject(vmobject.release_nonnull());
m_userspace_framebuffer_region->remap();
m_graphical_writes_enabled = false;
}
void FramebufferDevice::activate_writes()
{
@ -75,6 +83,7 @@ void FramebufferDevice::activate_writes()
auto vmobject = m_userspace_real_framebuffer_vmobject;
m_userspace_framebuffer_region->set_vmobject(vmobject.release_nonnull());
m_userspace_framebuffer_region->remap();
m_graphical_writes_enabled = true;
}
String FramebufferDevice::device_name() const

2
Kernel/Graphics/FramebufferDevice.h
View File

@ -59,6 +59,8 @@ private:
OwnPtr<Region> m_real_framebuffer_region;
OwnPtr<Region> m_swapped_framebuffer_region;
bool m_graphical_writes_enabled { true };
RefPtr<AnonymousVMObject> m_userspace_real_framebuffer_vmobject;
Region* m_userspace_framebuffer_region { nullptr };
};