[PATCH 01/11] [DO, NOT, REVIEW] drm/xe: Do not forward invalid TLB invalidation seqnos to upper layers

[Brian Nguyen <brian3.nguyen@intel.com>]

From: Matthew Brost <matthew.brost@intel.com>

This is a dependent patch for the page reclamation patch series
taken from another patch series by Matthew Brost, currently under
review: https://patchwork.freedesktop.org/series/156874/

Page reclamation takes the same idea of using invalid seqno to indicate
the initial H2G actions of the in progress tlb invalidation.

Review and comments for this patch should be done in the original patch
series.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Brian Nguyen <brian3.nguyen@intel.com>
---
 drivers/gpu/drm/xe/xe_guc_tlb_inval.c   | 3 ++-
 drivers/gpu/drm/xe/xe_tlb_inval_types.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_guc_tlb_inval.c b/drivers/gpu/drm/xe/xe_guc_tlb_inval.c
index a80175c7c478..f1fd2dd90742 100644
--- a/drivers/gpu/drm/xe/xe_guc_tlb_inval.c
+++ b/drivers/gpu/drm/xe/xe_guc_tlb_inval.c
@@ -236,7 +236,8 @@ int xe_guc_tlb_inval_done_handler(struct xe_guc *guc, u32 *msg, u32 len)
 	if (unlikely(len != 1))
 		return -EPROTO;
 
-	xe_tlb_inval_done_handler(&gt->tlb_inval, msg[0]);
+	if (msg[0] != TLB_INVALIDATION_SEQNO_INVALID)
+		xe_tlb_inval_done_handler(&gt->tlb_inval, msg[0]);
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/xe/xe_tlb_inval_types.h b/drivers/gpu/drm/xe/xe_tlb_inval_types.h
index 8f8b060e9005..7a6967ce3b76 100644
--- a/drivers/gpu/drm/xe/xe_tlb_inval_types.h
+++ b/drivers/gpu/drm/xe/xe_tlb_inval_types.h
@@ -80,6 +80,7 @@ struct xe_tlb_inval {
 	const struct xe_tlb_inval_ops *ops;
 	/** @tlb_inval.seqno: TLB invalidation seqno, protected by CT lock */
 #define TLB_INVALIDATION_SEQNO_MAX	0x100000
+#define TLB_INVALIDATION_SEQNO_INVALID	TLB_INVALIDATION_SEQNO_MAX
 	int seqno;
 	/** @tlb_invalidation.seqno_lock: protects @tlb_invalidation.seqno */
 	struct mutex seqno_lock;
-- 
2.51.2