IB/hfi1: Add mmu_rb_node refcount to hfi1_mmu_rb_template tracepoints

Add kref_read() of mmu_rb_node.refcount in hfi1_mmu_rb_template-type
tracepoint output.

Change hfi1_mmu_rb_template tracepoint to take a struct mmu_rb_node* and
record the values it needs from that. This makes the trace_hfi1_mmu*()
calls shorter and easier to read.

Add hfi1_mmu_release_node() tracepoint before all
mmu_rb_node->handler->ops->remove() calls.

Make hfi1_mmu_rb_search() tracepoint its own tracepoint type separate
from hfi1_mmu_rb_template since hfi1_mmu_rb_search() does not take a
struct mmu_rb_node*.

Link: https://lore.kernel.org/r/168451525987.3702129.12824880387615916700.stgit@awfm-02.cornelisnetworks.comReviewed-by: Dean Luick <dean.luick@cornelisnetworks.com>
Signed-off-by: Brendan Cunningham <bcunningham@cornelisnetworks.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/hfi1/mmu_rb.c

@@ -124,7 +124,7 @@ int hfi1_mmu_rb_insert(struct mmu_rb_handler *handler,
 	unsigned long flags;
 	int ret = 0;
 
-	trace_hfi1_mmu_rb_insert(mnode->addr, mnode->len);
+	trace_hfi1_mmu_rb_insert(mnode);
 
 	if (current->mm != handler->mn.mm)
 		return -EPERM;
@@ -189,6 +189,7 @@ static void release_immediate(struct kref *refcount)
 {
 	struct mmu_rb_node *mnode =
 		container_of(refcount, struct mmu_rb_node, refcount);
+	trace_hfi1_mmu_release_node(mnode);
 	mnode->handler->ops->remove(mnode->handler->ops_arg, mnode);
 }
 
@@ -252,6 +253,7 @@ void hfi1_mmu_rb_evict(struct mmu_rb_handler *handler, void *evict_arg)
 	spin_unlock_irqrestore(&handler->lock, flags);
 
 	list_for_each_entry_safe(rbnode, ptr, &del_list, list) {
+		trace_hfi1_mmu_rb_evict(rbnode);
 		kref_put(&rbnode->refcount, release_immediate);
 	}
 }
@@ -271,7 +273,7 @@ static int mmu_notifier_range_start(struct mmu_notifier *mn,
 		/* Guard against node removal. */
 		ptr = __mmu_int_rb_iter_next(node, range->start,
 					     range->end - 1);
-		trace_hfi1_mmu_mem_invalidate(node->addr, node->len);
+		trace_hfi1_mmu_mem_invalidate(node);
 		/* Remove from rb tree and lru_list. */
 		__mmu_int_rb_remove(node, root);
 		list_del_init(&node->list);
@@ -304,6 +306,7 @@ static void handle_remove(struct work_struct *work)
 	while (!list_empty(&del_list)) {
 		node = list_first_entry(&del_list, struct mmu_rb_node, list);
 		list_del(&node->list);
+		trace_hfi1_mmu_release_node(node);
 		handler->ops->remove(handler->ops_arg, node);
 	}
 }

drivers/infiniband/hw/hfi1/trace_mmu.h

@@ -15,31 +15,53 @@
 #define TRACE_SYSTEM hfi1_mmu
 
 DECLARE_EVENT_CLASS(hfi1_mmu_rb_template,
-		    TP_PROTO(unsigned long addr, unsigned long len),
-		    TP_ARGS(addr, len),
+		    TP_PROTO(struct mmu_rb_node *node),
+		    TP_ARGS(node),
 		    TP_STRUCT__entry(__field(unsigned long, addr)
 				     __field(unsigned long, len)
+				     __field(unsigned int, refcount)
 			    ),
-		    TP_fast_assign(__entry->addr = addr;
-				   __entry->len = len;
+		    TP_fast_assign(__entry->addr = node->addr;
+				   __entry->len = node->len;
+				   __entry->refcount = kref_read(&node->refcount);
 			    ),
-		    TP_printk("MMU node addr 0x%lx, len %lu",
+		    TP_printk("MMU node addr 0x%lx, len %lu, refcount %u",
 			      __entry->addr,
-			      __entry->len
+			      __entry->len,
+			      __entry->refcount
 			    )
 );
 
 DEFINE_EVENT(hfi1_mmu_rb_template, hfi1_mmu_rb_insert,
-	     TP_PROTO(unsigned long addr, unsigned long len),
-	     TP_ARGS(addr, len));
+	     TP_PROTO(struct mmu_rb_node *node),
+	     TP_ARGS(node));
 
-DEFINE_EVENT(hfi1_mmu_rb_template, hfi1_mmu_rb_search,
-	     TP_PROTO(unsigned long addr, unsigned long len),
-	     TP_ARGS(addr, len));
+TRACE_EVENT(hfi1_mmu_rb_search,
+	    TP_PROTO(unsigned long addr, unsigned long len),
+	    TP_ARGS(addr, len),
+	    TP_STRUCT__entry(__field(unsigned long, addr)
+			     __field(unsigned long, len)
+		    ),
+	    TP_fast_assign(__entry->addr = addr;
+			   __entry->len = len;
+		    ),
+	    TP_printk("MMU node addr 0x%lx, len %lu",
+		      __entry->addr,
+		      __entry->len
+		    )
+);
 
 DEFINE_EVENT(hfi1_mmu_rb_template, hfi1_mmu_mem_invalidate,
-	     TP_PROTO(unsigned long addr, unsigned long len),
-	     TP_ARGS(addr, len));
+	     TP_PROTO(struct mmu_rb_node *node),
+	     TP_ARGS(node));
+
+DEFINE_EVENT(hfi1_mmu_rb_template, hfi1_mmu_rb_evict,
+	     TP_PROTO(struct mmu_rb_node *node),
+	     TP_ARGS(node));
+
+DEFINE_EVENT(hfi1_mmu_rb_template, hfi1_mmu_release_node,
+	     TP_PROTO(struct mmu_rb_node *node),
+	     TP_ARGS(node));
 
 #endif /* __HFI1_TRACE_RC_H */