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multigpu: fix multi gpu checking (#13277)

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* multigpu: fix multi gpu checking

drmFD() from allocators is not always equal, because we reopen them
inside AQ for refcounting, meaning they get duplicated and become their
own fds, so checking if fd1 == fd2 ends up wrong.

introduce sameGpu in MiscFunctions that checks the actual drmDevice
meaning we can now even check if a rendernode is the same gpu as a
display node if we want.

* multigpu: move sameGpu to DRM namespace

move sameGpu out of MiscFunctions to DRM namespace.
This commit is contained in:
Tom Englund 2026-02-21 21:27:59 +01:00 • committed by GitHub
parent a20142bcce
commit 9f59ed7868
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4 changed files with 29 additions and 2 deletions
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3
src/managers/PointerManager.cpp
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@ -17,6 +17,7 @@
#include "../desktop/state/FocusState.hpp"
#include "SeatManager.hpp"
#include "../helpers/time/Time.hpp"
#include "../helpers/Drm.hpp"
#include <cstring>
#include <gbm.h>
#include <cairo/cairo.h>
@ -440,7 +441,7 @@ SP<Aquamarine::IBuffer> CPointerManager::renderHWCursorBuffer(SP<CPointerManager
options.length = 2;
options.scanout = true;
options.cursor = true;
options.multigpu = state->monitor->m_output->getBackend()->preferredAllocator()->drmFD() != g_pCompositor->m_drm.fd;
options.multigpu = !DRM::sameGpu(state->monitor->m_output->getBackend()->preferredAllocator()->drmFD(), g_pCompositor->m_drm.fd);
// We do not set the format (unless shm). If it's unset (DRM_FORMAT_INVALID) then the swapchain will pick for us,
// but if it's set, we don't wanna change it.
if (shouldUseCpuBuffer)