[PATCH v2] drm/xe: restrict multi-lrc to VCS/VECS engines

[Xin Wang <x.wang@intel.com>]

Tighten uapi validation to restrict multi-lrc support to VIDEO_DECODE and
VIDEO_ENHANCE engines only. This check should have been in place from the
start, as the driver typically avoids allowing uapi cases that we have
no userspace consumer for.

Additionally, the GuC firmware on ModSched platforms no longer supports
multi-lrc on non-media engines.

V2:
 - correct the typo (Shuicheng)
 - move the check earlier to avoid VM lookup (Shuicheng, Matt)
 - remove the graphics version check (Matt)
 - input more details in the commit info (Matt)

Cc: Shuicheng Lin <shuicheng.lin@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Xin Wang <x.wang@intel.com>
---
 drivers/gpu/drm/xe/xe_exec_queue.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_exec_queue.c b/drivers/gpu/drm/xe/xe_exec_queue.c
index 66d0e10ee2c4..36bf570ab221 100644
--- a/drivers/gpu/drm/xe/xe_exec_queue.c
+++ b/drivers/gpu/drm/xe/xe_exec_queue.c
@@ -1184,6 +1184,12 @@ int xe_exec_queue_create_ioctl(struct drm_device *dev, void *data,
 		if (XE_IOCTL_DBG(xe, !hwe))
 			return -EINVAL;
 
+		/* multi-lrc is only supported on VIDEO_DECODE and VIDEO_ENHANCE engines */
+		if (XE_IOCTL_DBG(xe, args->width > 1 &&
+				 eci[0].engine_class != DRM_XE_ENGINE_CLASS_VIDEO_DECODE &&
+				 eci[0].engine_class != DRM_XE_ENGINE_CLASS_VIDEO_ENHANCE))
+			return -EOPNOTSUPP;
+
 		vm = xe_vm_lookup(xef, args->vm_id);
 		if (XE_IOCTL_DBG(xe, !vm))
 			return -ENOENT;
-- 
2.43.0