5.0-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit ba420afab565bdc7b028ddd4f222260f2de7a1db ]
When the vblank irq happens, kernel time subsystem executes `vkms_vblank_simulate`. In parallel or not, it prepares all stuff necessary to the next vblank with arm, and it must flush these stuff before the next vblank irq. However, vblank counter is ahead when arm is executed in parallel with handle vblank.
CPU 0: CPU 1: | | atomic_commit_tail is ongoing | | | | hrtimer: vkms_vblank_simulate() | | | drm_crtc_handle_vblank() | | drm_crtc_arm_vblank() | | | ->get_vblank_timestamp() | | | | hrtimer_forward_now()
Then, we should guarantee that the vblank interval time is correct (not changed) before finish the vblank handle.
Fix the bug including the call to `hrtimer_forward_now()` in the same lock of `drm_crtc_handle_vblank()` to ensure that the timestamp update is correct when finish the vblank handle.
Signed-off-by: Shayenne Moura shayenneluzmoura@gmail.com Signed-off-by: Daniel Vetter daniel.vetter@intel.com Reviewed-by: Rodrigo Siqueira rodrigosiqueiramelo@gmail.com Signed-off-by: Rodrigo Siqueira rodrigosiqueiramelo@gmail.com Link: https://patchwork.freedesktop.org/patch/msgid/e2e4b8f3a5cab7b2dba75bf1930f86... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/vkms/vkms_crtc.c | 18 ++++++------------ 1 file changed, 6 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c index e747a7d16739..00d961862d77 100644 --- a/drivers/gpu/drm/vkms/vkms_crtc.c +++ b/drivers/gpu/drm/vkms/vkms_crtc.c @@ -4,13 +4,17 @@ #include <drm/drm_atomic_helper.h> #include <drm/drm_crtc_helper.h>
-static void _vblank_handle(struct vkms_output *output) +static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer) { + struct vkms_output *output = container_of(timer, struct vkms_output, + vblank_hrtimer); struct drm_crtc *crtc = &output->crtc; struct vkms_crtc_state *state = to_vkms_crtc_state(crtc->state); + int ret_overrun; bool ret;
spin_lock(&output->lock); + ret = drm_crtc_handle_vblank(crtc); if (!ret) DRM_ERROR("vkms failure on handling vblank"); @@ -31,19 +35,9 @@ static void _vblank_handle(struct vkms_output *output) DRM_WARN("failed to queue vkms_crc_work_handle"); }
- spin_unlock(&output->lock); -} - -static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer) -{ - struct vkms_output *output = container_of(timer, struct vkms_output, - vblank_hrtimer); - int ret_overrun; - - _vblank_handle(output); - ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer, output->period_ns); + spin_unlock(&output->lock);
return HRTIMER_RESTART; }