drm/xe: Fix dequeue of access counter work item

The access counters worker function is fixed to advance the head pointer
when dequeuing from the acc_queue.  This now matches the similar logic in
get_pagefault().
Signed-off-by: Bruce Chang <yu.bruce.chang@intel.com>
Signed-off-by: Brian Welty <brian.welty@intel.com>
Reviewed-by: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_gt_pagefault.c

@@ -542,6 +542,8 @@ static int handle_acc(struct xe_gt *gt, struct acc *acc)
 
 #define make_u64(hi__, low__)  ((u64)(hi__) << 32 | (u64)(low__))
 
+#define ACC_MSG_LEN_DW        4
+
 static int get_acc(struct acc_queue *acc_queue, struct acc *acc)
 {
 	const struct xe_guc_acc_desc *desc;
@@ -562,6 +564,9 @@ static int get_acc(struct acc_queue *acc_queue, struct acc *acc)
 		acc->access_type = FIELD_GET(ACC_TYPE, desc->dw0);
 		acc->va_range_base = make_u64(desc->dw3 & ACC_VIRTUAL_ADDR_RANGE_HI,
 					      desc->dw2 & ACC_VIRTUAL_ADDR_RANGE_LO);
+
+		acc_queue->head = (acc_queue->head + ACC_MSG_LEN_DW) %
+				  ACC_QUEUE_NUM_DW;
 	} else {
 		ret = -1;
 	}
@@ -589,8 +594,6 @@ static void acc_queue_work_func(struct work_struct *w)
 	}
 }
 
-#define ACC_MSG_LEN_DW	4
-
 static bool acc_queue_full(struct acc_queue *acc_queue)
 {
 	lockdep_assert_held(&acc_queue->lock);