svn commit: r323041 - head/sys/dev/cxgbe

[Navdeep Parhar]

Author: np
Date: Wed Aug 30 23:41:04 2017
New Revision: 323041
URL: https://svnweb.freebsd.org/changeset/base/323041

Log:
  cxgbe(4): Add two new debug flags -- one to allow manual firmware
  install after full initialization, and another to disable the TCB
  cache (T6+).  The latter works as a tunable only.
  
  Note that debug_flags are for debugging only and should not be set
  normally.
  
  MFC after:	1 week
  Sponsored by:	Chelsio Communications

Modified:
  head/sys/dev/cxgbe/adapter.h
  head/sys/dev/cxgbe/t4_main.c
  head/sys/dev/cxgbe/t4_sge.c

Modified: head/sys/dev/cxgbe/adapter.h
==============================================================================
--- head/sys/dev/cxgbe/adapter.h	Wed Aug 30 22:58:11 2017	(r323040)
+++ head/sys/dev/cxgbe/adapter.h	Wed Aug 30 23:41:04 2017	(r323041)
@@ -172,7 +172,9 @@ enum {
 	INTR_ALL	= (INTR_RXQ | INTR_OFLD_RXQ),
 
 	/* adapter debug_flags */
-	DF_DUMP_MBOX	= (1 << 0),
+	DF_DUMP_MBOX		= (1 << 0),	/* Log all mbox cmd/rpl. */
+	DF_LOAD_FW_ANYTIME	= (1 << 1),	/* Allow LOAD_FW after init */
+	DF_DISABLE_TCB_CACHE	= (1 << 2),	/* Disable TCB cache (T6+) */
 };
 
 #define IS_DOOMED(vi)	((vi)->flags & DOOMED)

Modified: head/sys/dev/cxgbe/t4_main.c
==============================================================================
--- head/sys/dev/cxgbe/t4_main.c	Wed Aug 30 22:58:11 2017	(r323040)
+++ head/sys/dev/cxgbe/t4_main.c	Wed Aug 30 23:41:04 2017	(r323041)
@@ -9049,7 +9049,14 @@ load_fw(struct adapter *sc, struct t4_data *fw)
 	if (rc)
 		return (rc);
 
-	if (sc->flags & FULL_INIT_DONE) {
+	/*
+	 * The firmware, with the sole exception of the memory parity error
+	 * handler, runs from memory and not flash.  It is almost always safe to
+	 * install a new firmware on a running system.  Just set bit 1 in
+	 * hw.cxgbe.dflags or dev.<nexus>.<n>.dflags first.
+	 */
+	if (sc->flags & FULL_INIT_DONE &&
+	    (sc->debug_flags & DF_LOAD_FW_ANYTIME) == 0) {
 		rc = EBUSY;
 		goto done;
 	}

Modified: head/sys/dev/cxgbe/t4_sge.c
==============================================================================
--- head/sys/dev/cxgbe/t4_sge.c	Wed Aug 30 22:58:11 2017	(r323040)
+++ head/sys/dev/cxgbe/t4_sge.c	Wed Aug 30 23:41:04 2017	(r323041)
@@ -615,6 +615,16 @@ t4_tweak_chip_settings(struct adapter *sc)
 		else
 			v = V_TSCALE(tscale - 2);
 		t4_set_reg_field(sc, A_SGE_ITP_CONTROL, m, v);
+
+		if (sc->debug_flags & DF_DISABLE_TCB_CACHE) {
+			m = V_RDTHRESHOLD(M_RDTHRESHOLD) | F_WRTHRTHRESHEN |
+			    V_WRTHRTHRESH(M_WRTHRTHRESH);
+			t4_tp_pio_read(sc, &v, 1, A_TP_CMM_CONFIG, 1);
+			v &= ~m;
+			v |= V_RDTHRESHOLD(1) | F_WRTHRTHRESHEN |
+			    V_WRTHRTHRESH(16);
+			t4_tp_pio_write(sc, &v, 1, A_TP_CMM_CONFIG, 1);
+		}
 	}
 
 	/* 4K, 16K, 64K, 256K DDP "page sizes" for TDDP */