From b4b3864eb0bde04901e921f56a4c88a4884b882f Mon Sep 17 00:00:00 2001
From: nwhitehorn <nwhitehorn@FreeBSD.org>
Date: Fri, 27 Sep 2013 13:12:47 +0000
Subject: Rework handling of ofw_quiesce(), making it the responsibility of the
 platform modules. Whether to call this function or not is highly machine
 dependent: on some systems, it is required, while on others it breaks
 everything. Platform modules are in a better position to figure this out.
 This is required for POWER hypervisor SCSI to work correctly. There are no
 functional changes on Powermac systems.

Approved by:	re (kib)
---
 sys/powerpc/include/ofw_machdep.h        |  1 +
 sys/powerpc/ofw/ofw_machdep.c            | 35 ++++++--------------------------
 sys/powerpc/powermac/platform_powermac.c | 31 ++++++++++++++++++++++++++++
 sys/powerpc/pseries/platform_chrp.c      |  3 +++
 4 files changed, 41 insertions(+), 29 deletions(-)

diff --git a/sys/powerpc/include/ofw_machdep.h b/sys/powerpc/include/ofw_machdep.h
index 612b45b..b85ebe1 100644
--- a/sys/powerpc/include/ofw_machdep.h
+++ b/sys/powerpc/include/ofw_machdep.h
@@ -46,5 +46,6 @@ boolean_t OF_bootstrap(void);
 void OF_reboot(void);
 
 void ofw_mem_regions(struct mem_region **, int *, struct mem_region **, int *);
+void ofw_quiesce(void); /* Must be called before VM is up! */
 
 #endif /* _MACHINE_OFW_MACHDEP_H_ */
diff --git a/sys/powerpc/ofw/ofw_machdep.c b/sys/powerpc/ofw/ofw_machdep.c
index 24aa24e..92470f0 100644
--- a/sys/powerpc/ofw/ofw_machdep.c
+++ b/sys/powerpc/ofw/ofw_machdep.c
@@ -69,7 +69,6 @@ static void	*fdt;
 int		ofw_real_mode;
 
 int		ofwcall(void *);
-static void	ofw_quiesce(void);
 static int	openfirmware(void *args);
 
 /*
@@ -472,12 +471,6 @@ OF_bootstrap()
 			return status;
 
 		OF_init(openfirmware);
-
-		/*
-		 * On some machines, we need to quiesce OF to turn off
-		 * background processes.
-		 */
-		ofw_quiesce();
 	} else if (fdt != NULL) {
 		status = OF_install(OFW_FDT, 0);
 
@@ -490,37 +483,21 @@ OF_bootstrap()
 	return (status);
 }
 
-static void
+void
 ofw_quiesce(void)
 {
-	phandle_t rootnode;
-	char model[32];
 	struct {
 		cell_t name;
 		cell_t nargs;
 		cell_t nreturns;
 	} args;
 
-	/*
-	 * Only quiesce Open Firmware on PowerMac11,2 and 12,1. It is
-	 * necessary there to shut down a background thread doing fan
-	 * management, and is harmful on other machines.
-	 *
-	 * Note: we don't need to worry about which OF module we are
-	 * using since this is called only from very early boot, within
-	 * OF's boot context.
-	 */
+	KASSERT(!pmap_bootstrapped, ("Cannot call ofw_quiesce after VM is up"));
 
-	rootnode = OF_finddevice("/");
-	if (OF_getprop(rootnode, "model", model, sizeof(model)) > 0) {
-		if (strcmp(model, "PowerMac11,2") == 0 ||
-		    strcmp(model, "PowerMac12,1") == 0) {
-			args.name = (cell_t)(uintptr_t)"quiesce";
-			args.nargs = 0;
-			args.nreturns = 0;
-			openfirmware(&args);
-		}
-	}
+	args.name = (cell_t)(uintptr_t)"quiesce";
+	args.nargs = 0;
+	args.nreturns = 0;
+	openfirmware(&args);
 }
 
 static int
diff --git a/sys/powerpc/powermac/platform_powermac.c b/sys/powerpc/powermac/platform_powermac.c
index e21a48c..1954ae9 100644
--- a/sys/powerpc/powermac/platform_powermac.c
+++ b/sys/powerpc/powermac/platform_powermac.c
@@ -56,6 +56,7 @@ extern void *ap_pcpu;
 #endif
 
 static int powermac_probe(platform_t);
+static int powermac_attach(platform_t);
 void powermac_mem_regions(platform_t, struct mem_region **phys, int *physsz,
     struct mem_region **avail, int *availsz);
 static u_long powermac_timebase_freq(platform_t, struct cpuref *cpuref);
@@ -67,6 +68,7 @@ static void powermac_reset(platform_t);
 
 static platform_method_t powermac_methods[] = {
 	PLATFORMMETHOD(platform_probe, 		powermac_probe),
+	PLATFORMMETHOD(platform_attach,		powermac_attach),
 	PLATFORMMETHOD(platform_mem_regions,	powermac_mem_regions),
 	PLATFORMMETHOD(platform_timebase_freq,	powermac_timebase_freq),
 	
@@ -118,6 +120,35 @@ powermac_mem_regions(platform_t plat, struct mem_region **phys, int *physsz,
 	ofw_mem_regions(phys,physsz,avail,availsz);
 }
 
+static int
+powermac_attach(platform_t plat)
+{
+	phandle_t rootnode;
+	char model[32];
+
+
+	/*
+	 * Quiesce Open Firmware on PowerMac11,2 and 12,1. It is
+	 * necessary there to shut down a background thread doing fan
+	 * management, and is harmful on other machines (it will make OF
+	 * shut off power to various system components it had turned on).
+	 *
+	 * Note: we don't need to worry about which OF module we are
+	 * using since this is called only from very early boot, within
+	 * OF's boot context.
+	 */
+
+	rootnode = OF_finddevice("/");
+	if (OF_getprop(rootnode, "model", model, sizeof(model)) > 0) {
+		if (strcmp(model, "PowerMac11,2") == 0 ||
+		    strcmp(model, "PowerMac12,1") == 0) {
+			ofw_quiesce();
+		}
+	}
+
+	return (0);
+}
+
 static u_long
 powermac_timebase_freq(platform_t plat, struct cpuref *cpuref)
 {
diff --git a/sys/powerpc/pseries/platform_chrp.c b/sys/powerpc/pseries/platform_chrp.c
index 1a9be4c..8d0f857 100644
--- a/sys/powerpc/pseries/platform_chrp.c
+++ b/sys/powerpc/pseries/platform_chrp.c
@@ -151,6 +151,9 @@ chrp_attach(platform_t plat)
 	}
 #endif
 
+	/* Some systems (e.g. QEMU) need Open Firmware to stand down */
+	ofw_quiesce();
+
 	return (0);
 }
 
-- 
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