subject:"\[PATCH 4\/9\] powerpc\/85xx\: support CPU hotplug for e500mc and e5500"

Re: [PATCH 4/9] powerpc/85xx: support CPU hotplug for e500mc and e5500

2014-03-11 Thread Chenhui Zhao

On Tue, Mar 11, 2014 at 06:48:13PM -0500, Scott Wood wrote:
> On Fri, 2014-03-07 at 12:58 +0800, Chenhui Zhao wrote:
> > diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
> > index ac2621a..f3f4401 100644
> > --- a/arch/powerpc/kernel/smp.c
> > +++ b/arch/powerpc/kernel/smp.c
> > @@ -405,8 +405,12 @@ void generic_cpu_die(unsigned int cpu)
> >  
> > for (i = 0; i < 100; i++) {
> > smp_rmb();
> > -   if (per_cpu(cpu_state, cpu) == CPU_DEAD)
> > +   if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
> > +#ifdef CONFIG_PPC64
> > +   paca[cpu].cpu_start = 0;
> > +#endif
> 
> Why wasn't this needed by previous ppc64 machines?

If not clear, cpu can't start in the case of cpu hotpolug.
The function pseries_cpu_die() in arch/powerpc/platforms/pseries/hotplug-cpu.c
also clears the flag.

> 
> > diff --git a/arch/powerpc/platforms/85xx/smp.c 
> > b/arch/powerpc/platforms/85xx/smp.c
> > index 2e5911e..0047883 100644
> > --- a/arch/powerpc/platforms/85xx/smp.c
> > +++ b/arch/powerpc/platforms/85xx/smp.c
> > @@ -19,6 +19,7 @@
> >  #include 
> >  #include 
> >  #include 
> > +#include 
> >  
> >  #include 
> >  #include 
> > @@ -46,6 +47,17 @@ static u64 timebase;
> >  static int tb_req;
> >  static int tb_valid;
> >  
> > +#ifdef CONFIG_PPC_E500MC
> > +/* specify the cpu PM state when cpu dies, PH15/NAP is the default */
> > +int qoriq_cpu_die_state = E500_PM_PH15;
> > +#endif
> 
> static?  Is there any way to modify this other than modifying source
> code?
> 
> BTW, QorIQ doesn't imply an e500mc derivative.

Will support e500, but for now these code support e500mc derivative in
advance.

Supposed qoriq_cpu_die_state can be changed by platform init code
if the default value is not proper for a specific platform.

> 
> > @@ -125,6 +138,34 @@ static void mpc85xx_take_timebase(void)
> >  }
> >  
> >  #ifdef CONFIG_HOTPLUG_CPU
> > +#ifdef CONFIG_PPC_E500MC
> > +static void qoriq_cpu_die(void)
> > +{
> > +   unsigned int cpu = smp_processor_id();
> > +
> > +   local_irq_disable();
> > +#ifdef CONFIG_PPC64
> > +   __hard_irq_disable();
> > +#endif
> 
> Why this instead of one call to hard_irq_disable() (no leading
> underscores)?
> 
> -Scott

hard_irq_disable() will clear soft_enabled again. local_irq_disable()
has cleared it.

Will use hard_irq_disable() to replace these lines.

  local_irq_disable();
  #ifdef CONFIG_PPC64
__hard_irq_disable();
  #endif

-Chenhui

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Re: [PATCH 4/9] powerpc/85xx: support CPU hotplug for e500mc and e5500

2014-03-11 Thread Scott Wood

On Fri, 2014-03-07 at 12:58 +0800, Chenhui Zhao wrote:
> diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
> index ac2621a..f3f4401 100644
> --- a/arch/powerpc/kernel/smp.c
> +++ b/arch/powerpc/kernel/smp.c
> @@ -405,8 +405,12 @@ void generic_cpu_die(unsigned int cpu)
>  
>   for (i = 0; i < 100; i++) {
>   smp_rmb();
> - if (per_cpu(cpu_state, cpu) == CPU_DEAD)
> + if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
> +#ifdef CONFIG_PPC64
> + paca[cpu].cpu_start = 0;
> +#endif

Why wasn't this needed by previous ppc64 machines?

> diff --git a/arch/powerpc/platforms/85xx/smp.c 
> b/arch/powerpc/platforms/85xx/smp.c
> index 2e5911e..0047883 100644
> --- a/arch/powerpc/platforms/85xx/smp.c
> +++ b/arch/powerpc/platforms/85xx/smp.c
> @@ -19,6 +19,7 @@
>  #include 
>  #include 
>  #include 
> +#include 
>  
>  #include 
>  #include 
> @@ -46,6 +47,17 @@ static u64 timebase;
>  static int tb_req;
>  static int tb_valid;
>  
> +#ifdef CONFIG_PPC_E500MC
> +/* specify the cpu PM state when cpu dies, PH15/NAP is the default */
> +int qoriq_cpu_die_state = E500_PM_PH15;
> +#endif

static?  Is there any way to modify this other than modifying source
code?

BTW, QorIQ doesn't imply an e500mc derivative.

> @@ -125,6 +138,34 @@ static void mpc85xx_take_timebase(void)
>  }
>  
>  #ifdef CONFIG_HOTPLUG_CPU
> +#ifdef CONFIG_PPC_E500MC
> +static void qoriq_cpu_die(void)
> +{
> + unsigned int cpu = smp_processor_id();
> +
> + local_irq_disable();
> +#ifdef CONFIG_PPC64
> + __hard_irq_disable();
> +#endif

Why this instead of one call to hard_irq_disable() (no leading
underscores)?

-Scott


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Re: [PATCH 4/9] powerpc/85xx: support CPU hotplug for e500mc and e5500

2014-03-11 Thread Scott Wood

On Fri, 2014-03-07 at 12:58 +0800, Chenhui Zhao wrote:
 diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
 index ac2621a..f3f4401 100644
 --- a/arch/powerpc/kernel/smp.c
 +++ b/arch/powerpc/kernel/smp.c
 @@ -405,8 +405,12 @@ void generic_cpu_die(unsigned int cpu)
  
   for (i = 0; i  100; i++) {
   smp_rmb();
 - if (per_cpu(cpu_state, cpu) == CPU_DEAD)
 + if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
 +#ifdef CONFIG_PPC64
 + paca[cpu].cpu_start = 0;
 +#endif

Why wasn't this needed by previous ppc64 machines?

 diff --git a/arch/powerpc/platforms/85xx/smp.c 
 b/arch/powerpc/platforms/85xx/smp.c
 index 2e5911e..0047883 100644
 --- a/arch/powerpc/platforms/85xx/smp.c
 +++ b/arch/powerpc/platforms/85xx/smp.c
 @@ -19,6 +19,7 @@
  #include linux/kexec.h
  #include linux/highmem.h
  #include linux/cpu.h
 +#include linux/smp.h
  
  #include asm/machdep.h
  #include asm/pgtable.h
 @@ -46,6 +47,17 @@ static u64 timebase;
  static int tb_req;
  static int tb_valid;
  
 +#ifdef CONFIG_PPC_E500MC
 +/* specify the cpu PM state when cpu dies, PH15/NAP is the default */
 +int qoriq_cpu_die_state = E500_PM_PH15;
 +#endif

static?  Is there any way to modify this other than modifying source
code?

BTW, QorIQ doesn't imply an e500mc derivative.

 @@ -125,6 +138,34 @@ static void mpc85xx_take_timebase(void)
  }
  
  #ifdef CONFIG_HOTPLUG_CPU
 +#ifdef CONFIG_PPC_E500MC
 +static void qoriq_cpu_die(void)
 +{
 + unsigned int cpu = smp_processor_id();
 +
 + local_irq_disable();
 +#ifdef CONFIG_PPC64
 + __hard_irq_disable();
 +#endif

Why this instead of one call to hard_irq_disable() (no leading
underscores)?

-Scott


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Please read the FAQ at  http://www.tux.org/lkml/

Re: [PATCH 4/9] powerpc/85xx: support CPU hotplug for e500mc and e5500

2014-03-11 Thread Chenhui Zhao

On Tue, Mar 11, 2014 at 06:48:13PM -0500, Scott Wood wrote:
 On Fri, 2014-03-07 at 12:58 +0800, Chenhui Zhao wrote:
  diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
  index ac2621a..f3f4401 100644
  --- a/arch/powerpc/kernel/smp.c
  +++ b/arch/powerpc/kernel/smp.c
  @@ -405,8 +405,12 @@ void generic_cpu_die(unsigned int cpu)
   
  for (i = 0; i  100; i++) {
  smp_rmb();
  -   if (per_cpu(cpu_state, cpu) == CPU_DEAD)
  +   if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
  +#ifdef CONFIG_PPC64
  +   paca[cpu].cpu_start = 0;
  +#endif
 
 Why wasn't this needed by previous ppc64 machines?

If not clear, cpu can't start in the case of cpu hotpolug.
The function pseries_cpu_die() in arch/powerpc/platforms/pseries/hotplug-cpu.c
also clears the flag.

 
  diff --git a/arch/powerpc/platforms/85xx/smp.c 
  b/arch/powerpc/platforms/85xx/smp.c
  index 2e5911e..0047883 100644
  --- a/arch/powerpc/platforms/85xx/smp.c
  +++ b/arch/powerpc/platforms/85xx/smp.c
  @@ -19,6 +19,7 @@
   #include linux/kexec.h
   #include linux/highmem.h
   #include linux/cpu.h
  +#include linux/smp.h
   
   #include asm/machdep.h
   #include asm/pgtable.h
  @@ -46,6 +47,17 @@ static u64 timebase;
   static int tb_req;
   static int tb_valid;
   
  +#ifdef CONFIG_PPC_E500MC
  +/* specify the cpu PM state when cpu dies, PH15/NAP is the default */
  +int qoriq_cpu_die_state = E500_PM_PH15;
  +#endif
 
 static?  Is there any way to modify this other than modifying source
 code?
 
 BTW, QorIQ doesn't imply an e500mc derivative.

Will support e500, but for now these code support e500mc derivative in
advance.

Supposed qoriq_cpu_die_state can be changed by platform init code
if the default value is not proper for a specific platform.

 
  @@ -125,6 +138,34 @@ static void mpc85xx_take_timebase(void)
   }
   
   #ifdef CONFIG_HOTPLUG_CPU
  +#ifdef CONFIG_PPC_E500MC
  +static void qoriq_cpu_die(void)
  +{
  +   unsigned int cpu = smp_processor_id();
  +
  +   local_irq_disable();
  +#ifdef CONFIG_PPC64
  +   __hard_irq_disable();
  +#endif
 
 Why this instead of one call to hard_irq_disable() (no leading
 underscores)?
 
 -Scott

hard_irq_disable() will clear soft_enabled again. local_irq_disable()
has cleared it.

Will use hard_irq_disable() to replace these lines.

  local_irq_disable();
  #ifdef CONFIG_PPC64
__hard_irq_disable();
  #endif

-Chenhui

--
To unsubscribe from this list: send the line unsubscribe linux-kernel in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[PATCH 4/9] powerpc/85xx: support CPU hotplug for e500mc and e5500

2014-03-06 Thread Chenhui Zhao

Implemented CPU hotplug on e500mc and e5500. On e5500 both 32-bit and
64-bit modes can work. Used some callback functions implemented in RCPM
driver.

Signed-off-by: Chenhui Zhao 
---
 arch/powerpc/Kconfig  |2 +-
 arch/powerpc/kernel/smp.c |6 ++-
 arch/powerpc/mm/tlb_nohash.c  |6 ++-
 arch/powerpc/platforms/85xx/smp.c |   94 ++---
 4 files changed, 87 insertions(+), 21 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a5e5d2e..05f6323 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -362,7 +362,7 @@ config SWIOTLB
 config HOTPLUG_CPU
bool "Support for enabling/disabling CPUs"
depends on SMP && (PPC_PSERIES || \
-   PPC_PMAC || PPC_POWERNV || (PPC_85xx && !PPC_E500MC))
+   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 ac2621a..f3f4401 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -405,8 +405,12 @@ void generic_cpu_die(unsigned int cpu)
 
for (i = 0; i < 100; i++) {
smp_rmb();
-   if (per_cpu(cpu_state, cpu) == CPU_DEAD)
+   if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
+#ifdef CONFIG_PPC64
+   paca[cpu].cpu_start = 0;
+#endif
return;
+   }
msleep(100);
}
printk(KERN_ERR "CPU%d didn't die...\n", cpu);
diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c
index b37a58e..d24e06c 100644
--- a/arch/powerpc/mm/tlb_nohash.c
+++ b/arch/powerpc/mm/tlb_nohash.c
@@ -648,8 +648,10 @@ 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);
+   }
 
if (book3e_htw_mode == PPC_HTW_NONE) {
patch_exception(0x1c0, exc_data_tlb_miss_bolted_book3e);
diff --git a/arch/powerpc/platforms/85xx/smp.c 
b/arch/powerpc/platforms/85xx/smp.c
index 2e5911e..0047883 100644
--- a/arch/powerpc/platforms/85xx/smp.c
+++ b/arch/powerpc/platforms/85xx/smp.c
@@ -19,6 +19,7 @@
 #include 
 #include 
 #include 
+#include 
 
 #include 
 #include 
@@ -46,6 +47,17 @@ static u64 timebase;
 static int tb_req;
 static int tb_valid;
 
+#ifdef CONFIG_PPC_E500MC
+/* specify the cpu PM state when cpu dies, PH15/NAP is the default */
+int qoriq_cpu_die_state = E500_PM_PH15;
+#endif
+
+#ifdef CONFIG_PPC_E500MC
+static void mpc85xx_timebase_freeze(int freeze)
+{
+   qoriq_pm_ops->freeze_time_base(freeze);
+}
+#else
 static void mpc85xx_timebase_freeze(int freeze)
 {
uint32_t mask;
@@ -58,6 +70,7 @@ static void mpc85xx_timebase_freeze(int freeze)
 
in_be32(>devdisr);
 }
+#endif
 
 static void mpc85xx_give_timebase(void)
 {
@@ -125,6 +138,34 @@ static void mpc85xx_take_timebase(void)
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
+#ifdef CONFIG_PPC_E500MC
+static void qoriq_cpu_die(void)
+{
+   unsigned int cpu = smp_processor_id();
+
+   local_irq_disable();
+#ifdef CONFIG_PPC64
+   __hard_irq_disable();
+#endif
+   idle_task_exit();
+
+   if (qoriq_pm_ops->irq_mask)
+   qoriq_pm_ops->irq_mask(cpu);
+
+   mtspr(SPRN_TCR, 0);
+   mtspr(SPRN_TSR, mfspr(SPRN_TSR));
+
+   generic_set_cpu_dead(cpu);
+
+   if (cur_cpu_spec && cur_cpu_spec->cpu_flush_caches)
+   cur_cpu_spec->cpu_flush_caches();
+
+   qoriq_pm_ops->cpu_enter_state(cpu, qoriq_cpu_die_state);
+
+   while (1)
+   ;
+}
+#else
 static void smp_85xx_mach_cpu_die(void)
 {
unsigned int cpu = smp_processor_id();
@@ -155,6 +196,7 @@ static void smp_85xx_mach_cpu_die(void)
;
 }
 #endif
+#endif
 
 static inline void flush_spin_table(void *spin_table)
 {
@@ -208,11 +250,8 @@ static int 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);
 
+#ifdef CONFIG_HOTPLUG_CPU
if (system_state == SYSTEM_RUNNING) {
/*
 * To keep it compatible with old boot program which uses
@@ -225,6 +264,12 @@ static int smp_85xx_kick_cpu(int nr)
out_be32(_table->addr_l, 0);
flush_spin_table(spin_table);
 
+#ifdef CONFIG_PPC_E500MC
+   /* Due to an erratum, wake the core

[PATCH 4/9] powerpc/85xx: support CPU hotplug for e500mc and e5500

2014-03-06 Thread Chenhui Zhao

Implemented CPU hotplug on e500mc and e5500. On e5500 both 32-bit and
64-bit modes can work. Used some callback functions implemented in RCPM
driver.

Signed-off-by: Chenhui Zhao chenhui.z...@freescale.com
---
 arch/powerpc/Kconfig  |2 +-
 arch/powerpc/kernel/smp.c |6 ++-
 arch/powerpc/mm/tlb_nohash.c  |6 ++-
 arch/powerpc/platforms/85xx/smp.c |   94 ++---
 4 files changed, 87 insertions(+), 21 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a5e5d2e..05f6323 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -362,7 +362,7 @@ config SWIOTLB
 config HOTPLUG_CPU
bool Support for enabling/disabling CPUs
depends on SMP  (PPC_PSERIES || \
-   PPC_PMAC || PPC_POWERNV || (PPC_85xx  !PPC_E500MC))
+   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 ac2621a..f3f4401 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -405,8 +405,12 @@ void generic_cpu_die(unsigned int cpu)
 
for (i = 0; i  100; i++) {
smp_rmb();
-   if (per_cpu(cpu_state, cpu) == CPU_DEAD)
+   if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
+#ifdef CONFIG_PPC64
+   paca[cpu].cpu_start = 0;
+#endif
return;
+   }
msleep(100);
}
printk(KERN_ERR CPU%d didn't die...\n, cpu);
diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c
index b37a58e..d24e06c 100644
--- a/arch/powerpc/mm/tlb_nohash.c
+++ b/arch/powerpc/mm/tlb_nohash.c
@@ -648,8 +648,10 @@ 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);
+   }
 
if (book3e_htw_mode == PPC_HTW_NONE) {
patch_exception(0x1c0, exc_data_tlb_miss_bolted_book3e);
diff --git a/arch/powerpc/platforms/85xx/smp.c 
b/arch/powerpc/platforms/85xx/smp.c
index 2e5911e..0047883 100644
--- a/arch/powerpc/platforms/85xx/smp.c
+++ b/arch/powerpc/platforms/85xx/smp.c
@@ -19,6 +19,7 @@
 #include linux/kexec.h
 #include linux/highmem.h
 #include linux/cpu.h
+#include linux/smp.h
 
 #include asm/machdep.h
 #include asm/pgtable.h
@@ -46,6 +47,17 @@ static u64 timebase;
 static int tb_req;
 static int tb_valid;
 
+#ifdef CONFIG_PPC_E500MC
+/* specify the cpu PM state when cpu dies, PH15/NAP is the default */
+int qoriq_cpu_die_state = E500_PM_PH15;
+#endif
+
+#ifdef CONFIG_PPC_E500MC
+static void mpc85xx_timebase_freeze(int freeze)
+{
+   qoriq_pm_ops-freeze_time_base(freeze);
+}
+#else
 static void mpc85xx_timebase_freeze(int freeze)
 {
uint32_t mask;
@@ -58,6 +70,7 @@ static void mpc85xx_timebase_freeze(int freeze)
 
in_be32(guts-devdisr);
 }
+#endif
 
 static void mpc85xx_give_timebase(void)
 {
@@ -125,6 +138,34 @@ static void mpc85xx_take_timebase(void)
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
+#ifdef CONFIG_PPC_E500MC
+static void qoriq_cpu_die(void)
+{
+   unsigned int cpu = smp_processor_id();
+
+   local_irq_disable();
+#ifdef CONFIG_PPC64
+   __hard_irq_disable();
+#endif
+   idle_task_exit();
+
+   if (qoriq_pm_ops-irq_mask)
+   qoriq_pm_ops-irq_mask(cpu);
+
+   mtspr(SPRN_TCR, 0);
+   mtspr(SPRN_TSR, mfspr(SPRN_TSR));
+
+   generic_set_cpu_dead(cpu);
+
+   if (cur_cpu_spec  cur_cpu_spec-cpu_flush_caches)
+   cur_cpu_spec-cpu_flush_caches();
+
+   qoriq_pm_ops-cpu_enter_state(cpu, qoriq_cpu_die_state);
+
+   while (1)
+   ;
+}
+#else
 static void smp_85xx_mach_cpu_die(void)
 {
unsigned int cpu = smp_processor_id();
@@ -155,6 +196,7 @@ static void smp_85xx_mach_cpu_die(void)
;
 }
 #endif
+#endif
 
 static inline void flush_spin_table(void *spin_table)
 {
@@ -208,11 +250,8 @@ static int 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);
 
+#ifdef CONFIG_HOTPLUG_CPU
if (system_state == SYSTEM_RUNNING) {
/*
 * To keep it compatible with old boot program which uses
@@ -225,6 +264,12 @@ static int smp_85xx_kick_cpu(int nr)
out_be32(spin_table-addr_l, 0);

Re: [PATCH 4/9] powerpc/85xx: support CPU hotplug for e500mc and e5500

Re: [PATCH 4/9] powerpc/85xx: support CPU hotplug for e500mc and e5500

Re: [PATCH 4/9] powerpc/85xx: support CPU hotplug for e500mc and e5500

Re: [PATCH 4/9] powerpc/85xx: support CPU hotplug for e500mc and e5500

[PATCH 4/9] powerpc/85xx: support CPU hotplug for e500mc and e5500

[PATCH 4/9] powerpc/85xx: support CPU hotplug for e500mc and e5500

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