aboutsummaryrefslogtreecommitdiff
path: root/arch/mips
diff options
context:
space:
mode:
authorRalf Baechle <ralf@linux-mips.org>2010-03-23 00:02:43 +0100
committerRalf Baechle <ralf@linux-mips.org>2010-04-12 17:26:19 +0100
commit8d9df29db273ab9a330828f4f4f6669d293a730a (patch)
tree7f5e9c87125d53fc2a512be150b01f6116918b3f /arch/mips
parent9538ca636f2fa28ae1514327328e2869f0215981 (diff)
downloadlinux-2.6.34-ux500-8d9df29db273ab9a330828f4f4f6669d293a730a.tar.gz
MIPS: Sibyte: Apply M3 workaround only on affected chip types and versions.
Previously it was unconditionally used on all Sibyte family SOCs. The M3 bug has to be handled in the TLB exception handler which is extremly performance sensitive, so this modification is expected to deliver around 2-3% performance improvment. This is important as required changes to the M3 workaround will make it more costly. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/include/asm/mach-sibyte/war.h6
-rw-r--r--arch/mips/sibyte/sb1250/setup.c15
2 files changed, 20 insertions, 1 deletions
diff --git a/arch/mips/include/asm/mach-sibyte/war.h b/arch/mips/include/asm/mach-sibyte/war.h
index 7950ef4f032..743385d7b5f 100644
--- a/arch/mips/include/asm/mach-sibyte/war.h
+++ b/arch/mips/include/asm/mach-sibyte/war.h
@@ -16,7 +16,11 @@
#if defined(CONFIG_SB1_PASS_1_WORKAROUNDS) || \
defined(CONFIG_SB1_PASS_2_WORKAROUNDS)
-#define BCM1250_M3_WAR 1
+#ifndef __ASSEMBLY__
+extern int sb1250_m3_workaround_needed(void);
+#endif
+
+#define BCM1250_M3_WAR sb1250_m3_workaround_needed()
#define SIBYTE_1956_WAR 1
#else
diff --git a/arch/mips/sibyte/sb1250/setup.c b/arch/mips/sibyte/sb1250/setup.c
index 0444da1e23c..92da3155ce0 100644
--- a/arch/mips/sibyte/sb1250/setup.c
+++ b/arch/mips/sibyte/sb1250/setup.c
@@ -87,6 +87,21 @@ static int __init setup_bcm1250(void)
return ret;
}
+int sb1250_m3_workaround_needed(void)
+{
+ switch (soc_type) {
+ case K_SYS_SOC_TYPE_BCM1250:
+ case K_SYS_SOC_TYPE_BCM1250_ALT:
+ case K_SYS_SOC_TYPE_BCM1250_ALT2:
+ case K_SYS_SOC_TYPE_BCM1125:
+ case K_SYS_SOC_TYPE_BCM1125H:
+ return soc_pass < K_SYS_REVISION_BCM1250_C0;
+
+ default:
+ return 0;
+ }
+}
+
static int __init setup_bcm112x(void)
{
int ret = 0;