From: Anton Blanchard <anton@samba.org>
Date: Wed, 22 Jun 2005 00:15:55 +0000 (-0700)
Subject: [PATCH] ppc64: set/clear SMT capable bit at boot
X-Git-Tag: v2.6.13-rc4~130^2~202^2~86
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=9b843cda193c56f5e12fedeaf95e0126b706d57b;p=linux-2.6-omap-h63xx.git

[PATCH] ppc64: set/clear SMT capable bit at boot

Allow the SMT bit to be set/reset at boot, like the ALTIVEC bit.  This
means we will enable SMT on unknown cpus that support it.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/ppc64/kernel/prom.c b/arch/ppc64/kernel/prom.c
index eb6538b5800..47727a6f734 100644
--- a/arch/ppc64/kernel/prom.c
+++ b/arch/ppc64/kernel/prom.c
@@ -884,6 +884,7 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
 {
 	char *type = get_flat_dt_prop(node, "device_type", NULL);
 	u32 *prop;
+	unsigned long size;
 
 	/* We are scanning "cpu" nodes only */
 	if (type == NULL || strcmp(type, "cpu") != 0)
@@ -929,6 +930,17 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
 		cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC;
 	}
 
+	/*
+	 * Check for an SMT capable CPU and set the CPU feature. We do
+	 * this by looking at the size of the ibm,ppc-interrupt-server#s
+	 * property
+	 */
+	prop = (u32 *)get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s",
+				       &size);
+	cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
+	if (prop && ((size / sizeof(u32)) > 1))
+		cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
+
 	return 0;
 }