[PATCH v9 31/34] drm/xe/vf: Use primary GT ordered work queue on media GT on PTL VF

[Matthew Brost <matthew.brost@intel.com>]

VF CCS restore is a primary GT operation on which the media GT depends.
Therefore, it doesn't make much sense to run these operations in
parallel. To address this, point the media GT's ordered work queue to
the primary GT's ordered work queue on platforms that require (PTL VFs)
CCS restore as part of VF post-migration recovery.

v7:
 - Remove bool from xe_gt_alloc (Lucas)
v9:
 - Fix typo (Lucas)

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 drivers/gpu/drm/xe/xe_device_types.h |  2 ++
 drivers/gpu/drm/xe/xe_gt.c           | 18 ++++++++++++++----
 drivers/gpu/drm/xe/xe_pci.c          |  2 ++
 drivers/gpu/drm/xe/xe_pci_types.h    |  1 +
 4 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index c66523bf4bf0..02c04ad7296e 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -334,6 +334,8 @@ struct xe_device {
 		u8 skip_mtcfg:1;
 		/** @info.skip_pcode: skip access to PCODE uC */
 		u8 skip_pcode:1;
+		/** @info.needs_shared_vf_gt_wq: needs shared GT WQ on VF */
+		u8 needs_shared_vf_gt_wq:1;
 	} info;
 
 	/** @wa_active: keep track of active workarounds */
diff --git a/drivers/gpu/drm/xe/xe_gt.c b/drivers/gpu/drm/xe/xe_gt.c
index 6951fedd4350..d8e94fb8b9bd 100644
--- a/drivers/gpu/drm/xe/xe_gt.c
+++ b/drivers/gpu/drm/xe/xe_gt.c
@@ -67,7 +67,11 @@
 
 struct xe_gt *xe_gt_alloc(struct xe_tile *tile)
 {
-	struct drm_device *drm = &tile_to_xe(tile)->drm;
+	struct xe_device *xe = tile_to_xe(tile);
+	struct drm_device *drm = &xe->drm;
+	bool shared_wq = xe->info.needs_shared_vf_gt_wq && tile->primary_gt &&
+		IS_SRIOV_VF(xe);
+	struct workqueue_struct *ordered_wq;
 	struct xe_gt *gt;
 
 	gt = drmm_kzalloc(drm, sizeof(*gt), GFP_KERNEL);
@@ -75,9 +79,15 @@ struct xe_gt *xe_gt_alloc(struct xe_tile *tile)
 		return ERR_PTR(-ENOMEM);
 
 	gt->tile = tile;
-	gt->ordered_wq = drmm_alloc_ordered_workqueue(drm, "gt-ordered-wq", WQ_MEM_RECLAIM);
-	if (IS_ERR(gt->ordered_wq))
-		return ERR_CAST(gt->ordered_wq);
+	if (shared_wq && tile->primary_gt->ordered_wq)
+		ordered_wq = tile->primary_gt->ordered_wq;
+	else
+		ordered_wq = drmm_alloc_ordered_workqueue(drm, "gt-ordered-wq",
+							  WQ_MEM_RECLAIM);
+	if (IS_ERR(ordered_wq))
+		return ERR_CAST(ordered_wq);
+
+	gt->ordered_wq = ordered_wq;
 
 	return gt;
 }
diff --git a/drivers/gpu/drm/xe/xe_pci.c b/drivers/gpu/drm/xe/xe_pci.c
index 3f42b91efa28..f8243622429d 100644
--- a/drivers/gpu/drm/xe/xe_pci.c
+++ b/drivers/gpu/drm/xe/xe_pci.c
@@ -347,6 +347,7 @@ static const struct xe_device_desc ptl_desc = {
 	.has_sriov = true,
 	.max_gt_per_tile = 2,
 	.needs_scratch = true,
+	.needs_shared_vf_gt_wq = true,
 };
 
 #undef PLATFORM
@@ -598,6 +599,7 @@ static int xe_info_init_early(struct xe_device *xe,
 	xe->info.skip_mtcfg = desc->skip_mtcfg;
 	xe->info.skip_pcode = desc->skip_pcode;
 	xe->info.needs_scratch = desc->needs_scratch;
+	xe->info.needs_shared_vf_gt_wq = desc->needs_shared_vf_gt_wq;
 
 	xe->info.probe_display = IS_ENABLED(CONFIG_DRM_XE_DISPLAY) &&
 				 xe_modparam.probe_display &&
diff --git a/drivers/gpu/drm/xe/xe_pci_types.h b/drivers/gpu/drm/xe/xe_pci_types.h
index 9b9766a3baa3..b11bf6abda5b 100644
--- a/drivers/gpu/drm/xe/xe_pci_types.h
+++ b/drivers/gpu/drm/xe/xe_pci_types.h
@@ -48,6 +48,7 @@ struct xe_device_desc {
 	u8 skip_guc_pc:1;
 	u8 skip_mtcfg:1;
 	u8 skip_pcode:1;
+	u8 needs_shared_vf_gt_wq:1;
 };
 
 struct xe_graphics_desc {
-- 
2.34.1