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Date:      Tue, 10 Jul 2018 03:03:10 +0000 (UTC)
From:      Navdeep Parhar <np@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r336159 - head/sys/dev/cxgbe
Message-ID:  <201807100303.w6A33APc046380@repo.freebsd.org>
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Author: np
Date: Tue Jul 10 03:03:10 2018
New Revision: 336159
URL: https://svnweb.freebsd.org/changeset/base/336159

Log:
  cxgbe(4): Add a sysctl to report the chip's microprocessor's load
  averages.  This works with debug or custom firmwares only.
  
  sysctl dev.<nexus>.<instance>.loadavg
  sysctl dev.t6nex.0.loadavg
  
  MFC after:	1 month
  Sponsored by:	Chelsio Communications

Modified:
  head/sys/dev/cxgbe/t4_main.c

Modified: head/sys/dev/cxgbe/t4_main.c
==============================================================================
--- head/sys/dev/cxgbe/t4_main.c	Tue Jul 10 02:46:31 2018	(r336158)
+++ head/sys/dev/cxgbe/t4_main.c	Tue Jul 10 03:03:10 2018	(r336159)
@@ -559,6 +559,7 @@ static int sysctl_fec(SYSCTL_HANDLER_ARGS);
 static int sysctl_autoneg(SYSCTL_HANDLER_ARGS);
 static int sysctl_handle_t4_reg64(SYSCTL_HANDLER_ARGS);
 static int sysctl_temperature(SYSCTL_HANDLER_ARGS);
+static int sysctl_loadavg(SYSCTL_HANDLER_ARGS);
 static int sysctl_cctrl(SYSCTL_HANDLER_ARGS);
 static int sysctl_cim_ibq_obq(SYSCTL_HANDLER_ARGS);
 static int sysctl_cim_la(SYSCTL_HANDLER_ARGS);
@@ -5542,6 +5543,10 @@ t4_sysctls(struct adapter *sc)
 	    CTLFLAG_RD, sc, 0, sysctl_temperature, "I",
 	    "chip temperature (in Celsius)");
 
+	SYSCTL_ADD_PROC(ctx, children, OID_AUTO, "loadavg", CTLTYPE_STRING |
+	    CTLFLAG_RD, sc, 0, sysctl_loadavg, "A",
+	    "microprocessor load averages (debug firmwares only)");
+
 	SYSCTL_ADD_INT(ctx, children, OID_AUTO, "core_vdd", CTLFLAG_RD,
 	    &sc->params.core_vdd, 0, "core Vdd (in mV)");
 
@@ -6606,6 +6611,45 @@ sysctl_temperature(SYSCTL_HANDLER_ARGS)
 	t = val == 0 ? -1 : val;
 
 	rc = sysctl_handle_int(oidp, &t, 0, req);
+	return (rc);
+}
+
+static int
+sysctl_loadavg(SYSCTL_HANDLER_ARGS)
+{
+	struct adapter *sc = arg1;
+	struct sbuf *sb;
+	int rc;
+	uint32_t param, val;
+
+	rc = begin_synchronized_op(sc, NULL, SLEEP_OK | INTR_OK, "t4lavg");
+	if (rc)
+		return (rc);
+	param = V_FW_PARAMS_MNEM(FW_PARAMS_MNEM_DEV) |
+	    V_FW_PARAMS_PARAM_X(FW_PARAMS_PARAM_DEV_LOAD);
+	rc = -t4_query_params(sc, sc->mbox, sc->pf, 0, 1, &param, &val);
+	end_synchronized_op(sc, 0);
+	if (rc)
+		return (rc);
+
+	rc = sysctl_wire_old_buffer(req, 0);
+	if (rc != 0)
+		return (rc);
+
+	sb = sbuf_new_for_sysctl(NULL, NULL, 4096, req);
+	if (sb == NULL)
+		return (ENOMEM);
+
+	if (val == 0xffffffff) {
+		/* Only debug and custom firmwares report load averages. */
+		sbuf_printf(sb, "not available");
+	} else {
+		sbuf_printf(sb, "%d %d %d", val & 0xff, (val >> 8) & 0xff,
+		    (val >> 16) & 0xff);
+	}
+	rc = sbuf_finish(sb);
+	sbuf_delete(sb);
+
 	return (rc);
 }

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