cxgb4: collect number of free PSTRUCT page pointers

Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb4/cudbg_entity.h

@@ -120,6 +120,8 @@ struct cudbg_mem_desc {
 	u32 idx;
 };
 
+#define CUDBG_MEMINFO_REV 1
+
 struct cudbg_meminfo {
 	struct cudbg_mem_desc avail[4];
 	struct cudbg_mem_desc mem[ARRAY_SIZE(cudbg_region) + 3];
@@ -137,6 +139,7 @@ struct cudbg_meminfo {
 	u32 port_alloc[4];
 	u32 loopback_used[NCHAN];
 	u32 loopback_alloc[NCHAN];
+	u32 p_structs_free_cnt;
 };
 
 struct cudbg_cim_pif_la {

drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c

@@ -364,6 +364,8 @@ int cudbg_fill_meminfo(struct adapter *padap,
 	meminfo_buff->tx_pages_data[3] = 1 << PMTXNUMCHN_G(lo);
 
 	meminfo_buff->p_structs = t4_read_reg(padap, TP_CMM_MM_MAX_PSTRUCT_A);
+	meminfo_buff->p_structs_free_cnt =
+		FREEPSTRUCTCOUNT_G(t4_read_reg(padap, TP_FLM_FREE_PS_CNT_A));
 
 	for (i = 0; i < 4; i++) {
 		if (CHELSIO_CHIP_VERSION(padap->params.chip) > CHELSIO_T5)
@@ -1465,14 +1467,23 @@ int cudbg_collect_meminfo(struct cudbg_init *pdbg_init,
 	struct adapter *padap = pdbg_init->adap;
 	struct cudbg_buffer temp_buff = { 0 };
 	struct cudbg_meminfo *meminfo_buff;
+	struct cudbg_ver_hdr *ver_hdr;
 	int rc;
 
-	rc = cudbg_get_buff(pdbg_init, dbg_buff, sizeof(struct cudbg_meminfo),
+	rc = cudbg_get_buff(pdbg_init, dbg_buff,
+			    sizeof(struct cudbg_ver_hdr) +
+			    sizeof(struct cudbg_meminfo),
 			    &temp_buff);
 	if (rc)
 		return rc;
 
-	meminfo_buff = (struct cudbg_meminfo *)temp_buff.data;
+	ver_hdr = (struct cudbg_ver_hdr *)temp_buff.data;
+	ver_hdr->signature = CUDBG_ENTITY_SIGNATURE;
+	ver_hdr->revision = CUDBG_MEMINFO_REV;
+	ver_hdr->size = sizeof(struct cudbg_meminfo);
+
+	meminfo_buff = (struct cudbg_meminfo *)(temp_buff.data +
+						sizeof(*ver_hdr));
 	rc = cudbg_fill_meminfo(padap, meminfo_buff);
 	if (rc) {
 		cudbg_err->sys_err = rc;

drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c

@@ -224,7 +224,8 @@ static u32 cxgb4_get_entity_length(struct adapter *adap, u32 entity)
 		len = sizeof(struct cudbg_tp_la) + TPLA_SIZE * sizeof(u64);
 		break;
 	case CUDBG_MEMINFO:
-		len = sizeof(struct cudbg_meminfo);
+		len = sizeof(struct cudbg_ver_hdr) +
+		      sizeof(struct cudbg_meminfo);
 		break;
 	case CUDBG_CIM_PIF_LA:
 		len = sizeof(struct cudbg_cim_pif_la);

drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c

@@ -2905,7 +2905,8 @@ static int meminfo_show(struct seq_file *seq, void *v)
 		   meminfo.tx_pages_data[1], meminfo.tx_pages_data[2],
 		   meminfo.tx_pages_data[3]);
 
-	seq_printf(seq, "%u p-structs\n\n", meminfo.p_structs);
+	seq_printf(seq, "%u p-structs (%u free)\n\n",
+		   meminfo.p_structs, meminfo.p_structs_free_cnt);
 
 	for (i = 0; i < 4; i++)
 		/* For T6 these are MAC buffer groups */

drivers/net/ethernet/chelsio/cxgb4/t4_regs.h

@@ -1502,8 +1502,13 @@
 #define TP_MIB_DATA_A	0x7e54
 #define TP_INT_CAUSE_A	0x7e74
 
+#define TP_FLM_FREE_PS_CNT_A 0x7e80
 #define TP_FLM_FREE_RX_CNT_A 0x7e84
 
+#define FREEPSTRUCTCOUNT_S    0
+#define FREEPSTRUCTCOUNT_M    0x1fffffU
+#define FREEPSTRUCTCOUNT_G(x) (((x) >> FREEPSTRUCTCOUNT_S) & FREEPSTRUCTCOUNT_M)
+
 #define FREERXPAGECOUNT_S    0
 #define FREERXPAGECOUNT_M    0x1fffffU
 #define FREERXPAGECOUNT_V(x) ((x) << FREERXPAGECOUNT_S)