From: Kumar Gala <galak@kernel.crashing.org>
Date: Thu, 13 Oct 2011 15:13:09 +0000 (-0500)
Subject: powerpc/85xx: Setup secondary cores PIR with hard SMP id
X-Git-Tag: MMI-PSA29.97-13-9~18099^2~11
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=45116806139743cf35baa01a584e5972e5d833f6;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

powerpc/85xx: Setup secondary cores PIR with hard SMP id

Normally logical and hard cpu ID are the same, however in same cases like
on the P3060 they may differ.  Where the logical is 0..5, the hard id
goes 0,1,4..7.  This can causes issues for places we utilize PIR to index
into array like in debug exception handlers for finding the exception
stack.

Move to setting up PIR with hard_smp_processor_id fixes the issue.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---

diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c
index d6e47464a0d4..190d111fc117 100644
--- a/arch/powerpc/platforms/85xx/smp.c
+++ b/arch/powerpc/platforms/85xx/smp.c
@@ -48,10 +48,11 @@ smp_85xx_kick_cpu(int nr)
 	const u64 *cpu_rel_addr;
 	__iomem u32 *bptr_vaddr;
 	struct device_node *np;
-	int n = 0;
+	int n = 0, hw_cpu = get_hard_smp_processor_id(nr);
 	int ioremappable;
 
-	WARN_ON (nr < 0 || nr >= NR_CPUS);
+	WARN_ON(nr < 0 || nr >= NR_CPUS);
+	WARN_ON(hw_cpu < 0 || hw_cpu >= NR_CPUS);
 
 	pr_debug("smp_85xx_kick_cpu: kick CPU #%d\n", nr);
 
@@ -79,7 +80,7 @@ smp_85xx_kick_cpu(int nr)
 
 	local_irq_save(flags);
 
-	out_be32(bptr_vaddr + BOOT_ENTRY_PIR, nr);
+	out_be32(bptr_vaddr + BOOT_ENTRY_PIR, hw_cpu);
 #ifdef CONFIG_PPC32
 	out_be32(bptr_vaddr + BOOT_ENTRY_ADDR_LOWER, __pa(__early_start));
 
@@ -88,7 +89,7 @@ smp_85xx_kick_cpu(int nr)
 				(ulong)(bptr_vaddr + SIZE_BOOT_ENTRY));
 
 	/* Wait a bit for the CPU to ack. */
-	while ((__secondary_hold_acknowledge != nr) && (++n < 1000))
+	while ((__secondary_hold_acknowledge != hw_cpu) && (++n < 1000))
 		mdelay(1);
 #else
 	smp_generic_kick_cpu(nr);