octeontx2-af: Add debugfs support to dump NIX TM topology

This patch adds support to dump NIX transmit queue topology.
There are multiple levels of scheduling/shaping supported by
NIX and a packet traverses through multiple levels before sending
the packet out. At each level, there are set of scheduling/shaping
rules applied to a packet flow.

Each packet traverses through multiple levels
SQ->SMQ->TL4->TL3->TL2->TL1 and these levels are mapped in a parent-child
relationship.

This patch dumps the debug information related to all TM Levels in
the following way.

Example:
$ echo <nixlf> > /sys/kernel/debug/octeontx2/nix/tm_tree
$ cat /sys/kernel/debug/octeontx2/nix/tm_tree

A more desriptive set of registers at each level can be dumped
in the following way.

Example:
$ echo <nixlf> > /sys/kernel/debug/octeontx2/nix/tm_topo
$ cat /sys/kernel/debug/octeontx2/nix/tm_topo
Signed-off-by: Anshumali Gaur <agaur@marvell.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/octeontx2/af/rvu.h

@@ -76,6 +76,7 @@ struct rvu_debugfs {
 	struct dump_ctx nix_cq_ctx;
 	struct dump_ctx nix_rq_ctx;
 	struct dump_ctx nix_sq_ctx;
+	struct dump_ctx nix_tm_ctx;
 	struct cpt_ctx cpt_ctx[MAX_CPT_BLKS];
 	int npa_qsize_id;
 	int nix_qsize_id;

drivers/net/ethernet/marvell/octeontx2/af/rvu_reg.h

@@ -429,6 +429,8 @@
 #define NIX_AF_RX_ACTIVE_CYCLES_PCX(a)	(0x4800 | (a) << 16)
 #define NIX_AF_LINKX_CFG(a)		(0x4010 | (a) << 17)
 #define NIX_AF_MDQX_IN_MD_COUNT(a)	(0x14e0 | (a) << 16)
+#define NIX_AF_SMQX_STATUS(a)		(0x730 | (a) << 16)
+#define NIX_AF_MDQX_OUT_MD_COUNT(a)	(0xdb0 | (a) << 16)
 
 #define NIX_PRIV_AF_INT_CFG		(0x8000000)
 #define NIX_PRIV_LFX_CFG		(0x8000010)
@@ -442,6 +444,11 @@
 #define NIX_CONST_MAX_BPIDS		GENMASK_ULL(23, 12)
 #define NIX_CONST_SDP_CHANS		GENMASK_ULL(11, 0)
 
+#define NIX_AF_MDQ_PARENT_MASK         GENMASK_ULL(24, 16)
+#define NIX_AF_TL4_PARENT_MASK         GENMASK_ULL(23, 16)
+#define NIX_AF_TL3_PARENT_MASK         GENMASK_ULL(23, 16)
+#define NIX_AF_TL2_PARENT_MASK         GENMASK_ULL(20, 16)
+
 /* SSO */
 #define SSO_AF_CONST			(0x1000)
 #define SSO_AF_CONST1			(0x1008)