drm/xe/pf: Scheduler groups are incompatible with multi-lrc

Since engines in the same class can be divided across multiple groups,
the GuC does not allow scheduler groups to be active if there are
multi-lrc contexts. This means that:

1) if a MLRC context is registered when we enable scheduler groups, the
   GuC will silently ignore the configuration
2) if a MLRC context is registered after scheduler groups are enabled,
   the GuC will disable the groups and generate an adverse event.

The expectation is that the admin will ensure that all apps that use
MLRC on PF have been terminated before scheduler groups are created. A
check is added anyway to make sure we don't still have contexts waiting
to be cleaned up laying around. A check is also added at queue creation
time to block MLRC queue creation if scheduler groups have been enabled.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patch.msgid.link/20251218223846.1146344-19-daniele.ceraolospurio@intel.com

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_exec_queue.c b/drivers/gpu/drm/xe/xe_exec_queue.c
index 41023a464480..c336dcd19020 100644
--- a/drivers/gpu/drm/xe/xe_exec_queue.c
+++ b/drivers/gpu/drm/xe/xe_exec_queue.c
@@ -17,6 +17,7 @@
 #include "xe_dep_scheduler.h"
 #include "xe_device.h"
 #include "xe_gt.h"
+#include "xe_gt_sriov_pf.h"
 #include "xe_gt_sriov_vf.h"
 #include "xe_hw_engine_class_sysfs.h"
 #include "xe_hw_engine_group.h"
@@ -1108,6 +1109,14 @@ static u32 calc_validate_logical_mask(struct xe_device *xe,
 	return return_mask;
 }
 
+static bool has_sched_groups(struct xe_gt *gt)
+{
+	if (IS_SRIOV_PF(gt_to_xe(gt)) && xe_gt_sriov_pf_sched_groups_enabled(gt))
+		return true;
+
+	return false;
+}
+
 int xe_exec_queue_create_ioctl(struct drm_device *dev, void *data,
 			       struct drm_file *file)
 {
@@ -1200,6 +1209,13 @@ int xe_exec_queue_create_ioctl(struct drm_device *dev, void *data,
 			return -ENOENT;
 		}
 
+		/* SRIOV sched groups are not compatible with multi-lrc */
+		if (XE_IOCTL_DBG(xe, args->width > 1 && has_sched_groups(hwe->gt))) {
+			up_read(&vm->lock);
+			xe_vm_put(vm);
+			return -EINVAL;
+		}
+
 		q = xe_exec_queue_create(xe, vm, logical_mask,
 					 args->width, hwe, flags,
 					 args->extensions);