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backends/drm: use closefb instead of removefb when available

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The closefb ioctl removes the userspace reference from the framebuffer but does
not try to disable planes and outputs if the buffer is still used. This allows
for example for smoother transitions between SDDM and the Plasma session
This commit is contained in:
Xaver Hugl 2023-10-16 15:39:10 +02:00
parent da80ed4318
commit b28d2c2d80
1 changed files with 8 additions and 1 deletions
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9
src/backends/drm/drm_buffer.cpp
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@ -23,6 +23,10 @@
#include <xf86drm.h>
#include <xf86drmMode.h>
#ifndef DRM_IOCTL_MODE_CLOSEFB
#define DRM_IOCTL_MODE_CLOSEFB 0xD0
#endif
namespace KWin
{
@ -43,7 +47,10 @@ DrmFramebuffer::DrmFramebuffer(DrmGpu *gpu, uint32_t fbId, GraphicsBuffer *buffe
DrmFramebuffer::~DrmFramebuffer()
{
drmModeRmFB(m_gpu->fd(), m_framebufferId);
uint32_t nonConstFb = m_framebufferId;
if (drmIoctl(m_gpu->fd(), DRM_IOCTL_MODE_CLOSEFB, &nonConstFb) != 0) {
drmIoctl(m_gpu->fd(), DRM_IOCTL_MODE_RMFB, &nonConstFb);
}
}
uint32_t DrmFramebuffer::framebufferId() const