From: Benjamin Herrenschmidt Date: Sun, 11 Jan 2009 19:03:45 +0000 (+0000) Subject: powerpc/powermac: Fix occasional SMP boot failure X-Git-Tag: v2.6.29-rc2~76^2~4 X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=c478b58135e6c9b49c8b80bff8ef910f2ba9b313;p=linux-2.6-omap-h63xx.git powerpc/powermac: Fix occasional SMP boot failure The PowerMac kernel occasionally fails to bring up the secondary CPUs on SMP, the trigger factor seem to be fairly random and related to location of code and data. This appears to be due to the initial loading of the TOC value by the secondary processor which now happens before we clear HID4:RM_CI (Real Mode Cache Invalidate). This bit should really be cleared before we do any load or store other than fetching code. This fix works based on the assumption that all SMP 64-bit PowerMacs use variants of the 970, which fortunately is true, by explicitely clearing that bit, adding an slbia for good measure as RM_CI mode is known to create bogus ERAT entries. I also removed some spurrious debug output that was left enabled by mistake while at it. Signed-off-by: Benjamin Herrenschmidt --- diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index b4bcf5a930f..ebaedafc8e6 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -1518,6 +1518,15 @@ _GLOBAL(pmac_secondary_start) /* turn on 64-bit mode */ bl .enable_64b_mode + li r0,0 + mfspr r3,SPRN_HID4 + rldimi r3,r0,40,23 /* clear bit 23 (rm_ci) */ + sync + mtspr SPRN_HID4,r3 + isync + sync + slbia + /* get TOC pointer (real address) */ bl .relative_toc diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c index 6b0711c15ec..bd8817b00fa 100644 --- a/arch/powerpc/platforms/powermac/smp.c +++ b/arch/powerpc/platforms/powermac/smp.c @@ -53,7 +53,7 @@ #include #include -#define DEBUG +#undef DEBUG #ifdef DEBUG #define DBG(fmt...) udbg_printf(fmt)