From: mhorne <mhorne@FreeBSD.org>
Date: Mon, 16 Sep 2019 22:17:16 +0000 (+0000)
Subject: RISC-V: Support EARLY_AP_STARTUP
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=e9360c33ab5621b4dc17a3a02423abd84ab52241;p=freebsd.git

RISC-V: Support EARLY_AP_STARTUP

The EARLY_AP_STARTUP option initializes non-boot processors
much sooner during startup. This adds support for this option
on RISC-V and enables it by default for GENERIC.

Reviewed by:	jhb, markj
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D21661
---

diff --git a/sys/riscv/conf/GENERIC b/sys/riscv/conf/GENERIC
index 5b647977879..257b836d0ed 100644
--- a/sys/riscv/conf/GENERIC
+++ b/sys/riscv/conf/GENERIC
@@ -71,6 +71,7 @@ options 	RACCT			# Resource accounting framework
 options 	RACCT_DEFAULT_TO_DISABLED # Set kern.racct.enable=0 by default
 options 	RCTL			# Resource limits
 options 	SMP
+options 	EARLY_AP_STARTUP
 options 	INTRNG
 
 # RISC-V SBI console
diff --git a/sys/riscv/riscv/clock.c b/sys/riscv/riscv/clock.c
index e0c2d4ba3c0..f69fc321a55 100644
--- a/sys/riscv/riscv/clock.c
+++ b/sys/riscv/riscv/clock.c
@@ -37,10 +37,34 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/types.h>
 #include <sys/systm.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/proc.h>
+#include <sys/sched.h>
+#include <sys/smp.h>
 
 void
 cpu_initclocks(void)
 {
+#ifdef EARLY_AP_STARTUP
+	struct thread *td;
+	int i;
 
+	td = curthread;
 	cpu_initclocks_bsp();
+	CPU_FOREACH(i) {
+		if (i == 0)
+			continue;
+		thread_lock(td);
+		sched_bind(td, i);
+		thread_unlock(td);
+		cpu_initclocks_ap();
+	}
+	thread_lock(td);
+	if (sched_is_bound(td))
+		sched_unbind(td);
+	thread_unlock(td);
+#else
+	cpu_initclocks_bsp();
+#endif
 }
diff --git a/sys/riscv/riscv/mp_machdep.c b/sys/riscv/riscv/mp_machdep.c
index adffd2fa1e8..f6d3dfce5cd 100644
--- a/sys/riscv/riscv/mp_machdep.c
+++ b/sys/riscv/riscv/mp_machdep.c
@@ -257,8 +257,10 @@ init_secondary(uint64_t hart)
 	/* Enable software interrupts */
 	riscv_unmask_ipi();
 
+#ifndef EARLY_AP_STARTUP
 	/* Start per-CPU event timers. */
 	cpu_initclocks_ap();
+#endif
 
 	/* Enable external (PLIC) interrupts */
 	csr_set(sie, SIE_SEIE);