[PATCH 04/14] perf/arm-cmn: Refactor node ID handling

[Robin Murphy]

Add a bit more abstraction for the places where we decompose node IDs.
This will help keep things nice and manageable when we come to add yet
more variables which affect the node ID format. Also use the opportunity
to move the rest of the low-level node management helpers back up to the
logical place they were meant to be - how they ended up buried right in
the middle of the event-related definitions is somewhat of a mystery...

Signed-off-by: Robin Murphy <robin.murphy at arm.com>
---
 drivers/perf/arm-cmn.c | 94 +++++++++++++++++++++++++-----------------
 1 file changed, 56 insertions(+), 38 deletions(-)

diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index 1d52fcfe3a0d..adf50d613734 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -255,6 +255,58 @@ struct arm_cmn {
 
 static int arm_cmn_hp_state;
 
+struct arm_cmn_nodeid {
+	u8 x;
+	u8 y;
+	u8 port;
+	u8 dev;
+};
+
+static int arm_cmn_xyidbits(const struct arm_cmn *cmn)
+{
+	int dim = max(cmn->mesh_x, cmn->mesh_y);
+
+	return dim > 4 ? 3 : 2;
+}
+
+static struct arm_cmn_nodeid arm_cmn_nid(const struct arm_cmn *cmn, u16 id)
+{
+	struct arm_cmn_nodeid nid;
+	int bits = arm_cmn_xyidbits(cmn);
+
+	nid.x = CMN_NODEID_X(id, bits);
+	nid.y = CMN_NODEID_Y(id, bits);
+	nid.port = CMN_NODEID_PID(id);
+	nid.dev = CMN_NODEID_DEVID(id);
+
+	return nid;
+}
+
+static void arm_cmn_init_node_to_xp(const struct arm_cmn *cmn,
+				    struct arm_cmn_node *dn)
+{
+	struct arm_cmn_nodeid nid = arm_cmn_nid(cmn, dn->id);
+	int xp_idx = cmn->mesh_x * nid.y + nid.x;
+
+	dn->to_xp = (cmn->xps + xp_idx) - dn;
+}
+
+static struct arm_cmn_node *arm_cmn_node_to_xp(struct arm_cmn_node *dn)
+{
+	return dn->type == CMN_TYPE_XP ? dn : dn + dn->to_xp;
+}
+
+static struct arm_cmn_node *arm_cmn_node(const struct arm_cmn *cmn,
+					 enum cmn_node_type type)
+{
+	int i;
+
+	for (i = 0; i < cmn->num_dns; i++)
+		if (cmn->dns[i].type == type)
+			return &cmn->dns[i];
+	return NULL;
+}
+
 struct arm_cmn_hw_event {
 	struct arm_cmn_node *dn;
 	u64 dtm_idx[2];
@@ -295,38 +347,6 @@ struct arm_cmn_format_attr {
 	int config;
 };
 
-static int arm_cmn_xyidbits(const struct arm_cmn *cmn)
-{
-	return cmn->mesh_x > 4 || cmn->mesh_y > 4 ? 3 : 2;
-}
-
-static void arm_cmn_init_node_to_xp(const struct arm_cmn *cmn,
-				    struct arm_cmn_node *dn)
-{
-	int bits = arm_cmn_xyidbits(cmn);
-	int x = CMN_NODEID_X(dn->id, bits);
-	int y = CMN_NODEID_Y(dn->id, bits);
-	int xp_idx = cmn->mesh_x * y + x;
-
-	dn->to_xp = (cmn->xps + xp_idx) - dn;
-}
-
-static struct arm_cmn_node *arm_cmn_node_to_xp(struct arm_cmn_node *dn)
-{
-	return dn->type == CMN_TYPE_XP ? dn : dn + dn->to_xp;
-}
-
-static struct arm_cmn_node *arm_cmn_node(const struct arm_cmn *cmn,
-					 enum cmn_node_type type)
-{
-	int i;
-
-	for (i = 0; i < cmn->num_dns; i++)
-		if (cmn->dns[i].type == type)
-			return &cmn->dns[i];
-	return NULL;
-}
-
 #define CMN_EVENT_ATTR(_name, _type, _eventid, _occupid)		\
 	(&((struct arm_cmn_event_attr[]) {{				\
 		.attr = __ATTR(_name, 0444, arm_cmn_event_show, NULL),	\
@@ -966,11 +986,10 @@ static int arm_cmn_event_init(struct perf_event *event)
 	}
 
 	if (!hw->num_dns) {
-		int bits = arm_cmn_xyidbits(cmn);
+		struct arm_cmn_nodeid nid = arm_cmn_nid(cmn, nodeid);
 
 		dev_dbg(cmn->dev, "invalid node 0x%x (%d,%d,%d,%d) type 0x%x\n",
-			nodeid, CMN_NODEID_X(nodeid, bits), CMN_NODEID_Y(nodeid, bits),
-			CMN_NODEID_PID(nodeid), CMN_NODEID_DEVID(nodeid), type);
+			nodeid, nid.x, nid.y, nid.port, nid.dev, type);
 		return -EINVAL;
 	}
 	/*
@@ -1068,11 +1087,10 @@ static int arm_cmn_event_add(struct perf_event *event, int flags)
 			dn->wp_event[wp_idx] = dtc_idx;
 			writel_relaxed(cfg, dn->pmu_base + CMN_DTM_WPn_CONFIG(wp_idx));
 		} else {
-			unsigned int port = CMN_NODEID_PID(dn->id);
-			unsigned int dev = CMN_NODEID_DEVID(dn->id);
+			struct arm_cmn_nodeid nid = arm_cmn_nid(cmn, dn->id);
 
 			input_sel = CMN__PMEVCNT0_INPUT_SEL_DEV + dtm_idx +
-				    (port << 4) + (dev << 2);
+				    (nid.port << 4) + (nid.dev << 2);
 
 			if (arm_cmn_is_occup_event(type, CMN_EVENT_EVENTID(event))) {
 				int occupid = CMN_EVENT_OCCUPID(event);
-- 
2.28.0.dirty