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Kernel/Graphics: Propagate errors properly around in the VirtIO driver

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This happens to be a sad truth for the VirtIOGPU driver - it lacked any
error propagation measures and generally relied on clunky assumptions
that most operations with the GPU device are infallible, although in
reality much of them could fail, so we do need to handle errors.

To fix this, synchronous GPU commands no longer rely on the wait queue
mechanism anymore, so instead we introduce a timeout-based mechanism,
similar to how other Kernel drivers use a polling based mechanism with
the assumption that hardware could get stuck in an error state and we
could abort gracefully.

Then, we change most of the VirtIOGraphicsAdapter methods to propagate
errors properly to the original callers, to ensure that if a synchronous
GPU command failed, either the Kernel or userspace could do something
meaningful about this situation.
This commit is contained in:
Liav A 2022-12-16 15:51:24 +02:00 • committed by Sam Atkins
parent 12d4bbbd11
commit efae6e2270
5 changed files with 176 additions and 151 deletions
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13
Kernel/Graphics/VirtIOGPU/DisplayConnector.cpp
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@ -122,9 +122,9 @@ ErrorOr<void> VirtIODisplayConnector::flush_rectangle(size_t buffer_index, FBRec
.height = rect.height
};
m_graphics_adapter->transfer_framebuffer_data_to_host({}, *this, dirty_rect, true);
TRY(m_graphics_adapter->transfer_framebuffer_data_to_host({}, *this, dirty_rect, true));
// Flushing directly to screen
flush_displayed_image(dirty_rect, true);
TRY(flush_displayed_image(dirty_rect, true));
return {};
}
@ -139,9 +139,9 @@ ErrorOr<void> VirtIODisplayConnector::flush_first_surface()
.height = m_display_info.rect.height
};
m_graphics_adapter->transfer_framebuffer_data_to_host({}, *this, dirty_rect, true);
TRY(m_graphics_adapter->transfer_framebuffer_data_to_host({}, *this, dirty_rect, true));
// Flushing directly to screen
flush_displayed_image(dirty_rect, true);
TRY(flush_displayed_image(dirty_rect, true));
return {};
}
@ -241,10 +241,11 @@ void VirtIODisplayConnector::draw_ntsc_test_pattern(Badge<VirtIOGraphicsAdapter>
dbgln_if(VIRTIO_DEBUG, "Finish drawing the pattern");
}
void VirtIODisplayConnector::flush_displayed_image(Graphics::VirtIOGPU::Protocol::Rect const& dirty_rect, bool main_buffer)
ErrorOr<void> VirtIODisplayConnector::flush_displayed_image(Graphics::VirtIOGPU::Protocol::Rect const& dirty_rect, bool main_buffer)
{
VERIFY(m_graphics_adapter->operation_lock().is_locked());
m_graphics_adapter->flush_displayed_image({}, *this, dirty_rect, main_buffer);
TRY(m_graphics_adapter->flush_displayed_image({}, *this, dirty_rect, main_buffer));
return {};
}
void VirtIODisplayConnector::set_dirty_displayed_rect(Graphics::VirtIOGPU::Protocol::Rect const& dirty_rect, bool main_buffer)