Use an AS=1 trampoline TLB entry to allow all normal TLB1 entries to
be loaded at once.  This avoids the need to keep the translation that
code is executing from in the same TLB entry in the final TLB
configuration as during early boot, which in turn is helpful for
relocatable kernels (e.g. kdump) where the kernel is not running from
what would be the first TLB entry.

On e6500, we limit map_mem_in_cams() to the primary hwthread of a
core (the boot cpu is always considered primary, as a kdump kernel
can be entered on any cpu).  Each TLB only needs to be set up once,
and when we do, we don't want another thread to be running when we
create a temporary trampoline TLB1 entry.

Signed-off-by: Scott Wood <redacted>
---
 arch/powerpc/kernel/setup_64.c   |  8 +++++
 arch/powerpc/mm/fsl_booke_mmu.c  | 15 ++++++++--
 arch/powerpc/mm/mmu_decl.h       |  1 +
 arch/powerpc/mm/tlb_nohash.c     | 19 +++++++++++-
 arch/powerpc/mm/tlb_nohash_low.S | 63 ++++++++++++++++++++++++++++++++++++++++
 5 files changed, 102 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index bdcbb71..505ec2c 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c

@@ -108,6 +108,14 @@ static void setup_tlb_core_data(void)
 	for_each_possible_cpu(cpu) {
 		int first = cpu_first_thread_sibling(cpu);
 
+		/*
+		 * If we boot via kdump on a non-primary thread,
+		 * make sure we point at the thread that actually
+		 * set up this TLB.
+		 */
+		if (cpu_first_thread_sibling(boot_cpuid) == first)
+			first = boot_cpuid;
+
 		paca[cpu].tcd_ptr = &paca[first].tcd;
 
 		/*

diff --git a/arch/powerpc/mm/fsl_booke_mmu.c b/arch/powerpc/mm/fsl_booke_mmu.c
index 354ba3c..36d3c55 100644
--- a/arch/powerpc/mm/fsl_booke_mmu.c
+++ b/arch/powerpc/mm/fsl_booke_mmu.c

@@ -105,8 +105,9 @@ unsigned long p_mapped_by_tlbcam(phys_addr_t pa)
  * an unsigned long (for example, 32-bit implementations cannot support a 4GB
  * size).
  */
-static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
-		unsigned long size, unsigned long flags, unsigned int pid)
+static void preptlbcam(int index, unsigned long virt, phys_addr_t phys,
+		       unsigned long size, unsigned long flags,
+		       unsigned int pid)
 {
 	unsigned int tsize;
 

@@ -141,7 +142,13 @@ static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
 	tlbcam_addrs[index].start = virt;
 	tlbcam_addrs[index].limit = virt + size - 1;
 	tlbcam_addrs[index].phys = phys;
+}
 
+void settlbcam(int index, unsigned long virt, phys_addr_t phys,