The GSC microcontroller requires stolen memory, which can introduce latency spikes and negatively impact real-time performance.
Print a warning on CONFIG_PREEMPT_RT kernels to inform the user that GSC is active and that RT performance can be improved by disabling the GSC firmware (e.g., by setting the module parameter xe.gsc_firmware_path=""). Signed-off-by: Junxiao Chang <[email protected]> --- drivers/gpu/drm/xe/xe_gsc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/xe/xe_gsc.c b/drivers/gpu/drm/xe/xe_gsc.c index aab59dc647fbd..3d06ab6fecbe0 100644 --- a/drivers/gpu/drm/xe/xe_gsc.c +++ b/drivers/gpu/drm/xe/xe_gsc.c @@ -427,6 +427,11 @@ int xe_gsc_init(struct xe_gsc *gsc) else if (ret) goto out; + if (IS_ENABLED(CONFIG_PREEMPT_RT)) { + xe_gt_warn(gt, "RT performance might be impacted by GSC stolen memory usage\n"); + xe_gt_warn(gt, "Consider disabling GSC (xe.gsc_firmware_path=\"\") to improve it\n"); + } + ret = xe_gsc_proxy_init(gsc); if (ret && ret != -ENODEV) goto out; -- 2.43.0
