From: Chen-Hui Zhao <chenhui.z...@freescale.com>
* The paca[cpu].cpu_start is used as a signal to indicate if the cpu
should start. So it should be cleard in .cpu_die().
* The limit memory routine only needs to be ran once at boot time
by the boot cpu. Prevent other cpus running it again.
* Rearrange the code segment in smp_85xx_kick_cpu() to share codes
between PPC64 and PPC32 as far as possible.
Signed-off-by: Zhao Chenhui <chenhui.z...@freescale.com>
Signed-off-by: Li Yang <le...@freescale.com>
Signed-off-by: Andy Fleming <aflem...@freescale.com>
---
arch/powerpc/Kconfig | 2 +-
arch/powerpc/kernel/smp.c | 3 +++
arch/powerpc/mm/tlb_nohash.c | 6 ++++--
arch/powerpc/platforms/85xx/smp.c | 23 +++++++++++------------
4 files changed, 19 insertions(+), 15 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 0ad6e30..aa5794b 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -347,7 +347,7 @@ config SWIOTLB
config HOTPLUG_CPU
bool "Support for enabling/disabling CPUs"
depends on SMP && HOTPLUG && (PPC_PSERIES || \
- PPC_PMAC || PPC_POWERNV || PPC_85xx)
+ PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE)
---help---
Say Y here to be able to disable and re-enable individual
CPUs at runtime on SMP machines.
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 386c7ea..c8aa739 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -401,6 +401,9 @@ void generic_cpu_die(unsigned int cpu)
smp_rmb();
if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
platform_cpu_die(cpu);
+#ifdef CONFIG_PPC64
+ paca[cpu].cpu_start = 0;
+#endif
return;
}
msleep(100);
diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c
index 6888cad..de7bf06 100644
--- a/arch/powerpc/mm/tlb_nohash.c
+++ b/arch/powerpc/mm/tlb_nohash.c
@@ -627,8 +627,10 @@ static void __early_init_mmu(int boot_cpu)
num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
linear_map_top = map_mem_in_cams(linear_map_top, num_cams);
- /* limit memory so we dont have linear faults */
- memblock_enforce_memory_limit(linear_map_top);
+ if (boot_cpu) {
+ /* limit memory so we dont have linear faults */
+ memblock_enforce_memory_limit(linear_map_top);
+ }
patch_exception(0x1c0, exc_data_tlb_miss_bolted_book3e);
patch_exception(0x1e0, exc_instruction_tlb_miss_bolted_book3e);
diff --git a/arch/powerpc/platforms/85xx/smp.c
b/arch/powerpc/platforms/85xx/smp.c
index 04e9fb9..febca8f 100644
--- a/arch/powerpc/platforms/85xx/smp.c
+++ b/arch/powerpc/platforms/85xx/smp.c
@@ -259,10 +259,6 @@ static int __cpuinit smp_85xx_kick_cpu(int nr)
spin_table = phys_to_virt(*cpu_rel_addr);
local_irq_save(flags);
-#ifdef CONFIG_PPC32
-#ifdef CONFIG_HOTPLUG_CPU
- /* Corresponding to generic_set_cpu_dead() */
- generic_set_cpu_up(nr);
if (system_state == SYSTEM_RUNNING) {
/*
@@ -306,12 +302,19 @@ static int __cpuinit smp_85xx_kick_cpu(int nr)
/* clear the acknowledge status */
__secondary_hold_acknowledge = -1;
}
-#endif
flush_spin_table(spin_table);
out_be32(&spin_table->pir, hw_cpu);
+#ifdef CONFIG_PPC32
out_be32(&spin_table->addr_l, __pa(__early_start));
+#else
+ out_be32(&spin_table->addr_h,
+ __pa(*(u64 *)generic_secondary_smp_init) >> 32);
+ out_be32(&spin_table->addr_l,
+ __pa(*(u64 *)generic_secondary_smp_init) & 0xffffffff);
+#endif
flush_spin_table(spin_table);
+#ifdef CONFIG_PPC32
/* Wait a bit for the CPU to ack. */
if (!spin_event_timeout(__secondary_hold_acknowledge == hw_cpu,
10000, 100)) {
@@ -320,18 +323,14 @@ static int __cpuinit smp_85xx_kick_cpu(int nr)
ret = -ENOENT;
goto out;
}
-out:
#else
smp_generic_kick_cpu(nr);
-
- flush_spin_table(spin_table);
- out_be32(&spin_table->pir, hw_cpu);
- out_be64((u64 *)(&spin_table->addr_h),
- __pa((u64)*((unsigned long long *)generic_secondary_smp_init)));
- flush_spin_table(spin_table);
#endif
+ /* Corresponding to generic_set_cpu_dead() */
+ generic_set_cpu_up(nr);
cur_booting_core = hw_cpu;
+out:
local_irq_restore(flags);
if (ioremappable)
--
1.7.3
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