Le 19/08/2020 à 03:56, Michael Ellerman a écrit :
We have smp_ops->cpu_die() and ppc_md.cpu_die(). One of them offlines
the current CPU and one offlines another CPU, can you guess which is
which? Also one is in smp_ops and one is in ppc_md?

So rename ppc_md.cpu_die(), to cpu_offline_self(), because that's what
it does. And move it into smp_ops where it belongs.

Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
---
  arch/powerpc/include/asm/machdep.h           | 1 -
  arch/powerpc/include/asm/smp.h               | 3 +++
  arch/powerpc/kernel/smp.c                    | 4 ++--
  arch/powerpc/kernel/sysfs.c                  | 4 +++-
  arch/powerpc/platforms/85xx/smp.c            | 4 ++--
  arch/powerpc/platforms/powermac/pmac.h       | 2 +-
  arch/powerpc/platforms/powermac/sleep.S      | 6 +++---
  arch/powerpc/platforms/powermac/smp.c        | 8 ++++----
  arch/powerpc/platforms/powernv/smp.c         | 4 ++--
  arch/powerpc/platforms/pseries/hotplug-cpu.c | 6 +++---
  10 files changed, 23 insertions(+), 19 deletions(-)

diff --git a/arch/powerpc/include/asm/machdep.h 
b/arch/powerpc/include/asm/machdep.h
index a90b892f0bfe..cc2ec7101520 100644
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -65,7 +65,6 @@ struct machdep_calls {
        void __noreturn (*restart)(char *cmd);
        void __noreturn (*halt)(void);
        void            (*panic)(char *str);
-       void            (*cpu_die)(void);
long (*time_init)(void); /* Optional, may be NULL */ diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h
index a314d2d2d2be..0d00faf8f119 100644
--- a/arch/powerpc/include/asm/smp.h
+++ b/arch/powerpc/include/asm/smp.h
@@ -49,6 +49,9 @@ struct smp_ops_t {
        int   (*cpu_disable)(void);
        void  (*cpu_die)(unsigned int nr);
        int   (*cpu_bootable)(unsigned int nr);
+#ifdef CONFIG_HOTPLUG_CPU

Is that a performance issue to have that member all the time in smp_ops_t ?
Otherwise we could avoid the #ifdef here and in arch/powerpc/kernel/sysfs.c

Christophe

+       void  (*cpu_offline_self)(void);
+#endif
  };
extern int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us);
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index c616d975bf95..faba0fdee500 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -1439,8 +1439,8 @@ void arch_cpu_idle_dead(void)
         */
        this_cpu_disable_ftrace();
- if (ppc_md.cpu_die)
-               ppc_md.cpu_die();
+       if (smp_ops->cpu_offline_self)
+               smp_ops->cpu_offline_self();
/* If we return, we re-enter start_secondary */
        start_secondary_resume();
diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index 6bebc9a52444..7c4ccc03c2de 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -1161,6 +1161,7 @@ static int __init topology_init(void)
        for_each_possible_cpu(cpu) {
                struct cpu *c = &per_cpu(cpu_devices, cpu);
+#ifdef CONFIG_HOTPLUG_CPU
                /*
                 * For now, we just see if the system supports making
                 * the RTAS calls for CPU hotplug.  But, there may be a
@@ -1168,8 +1169,9 @@ static int __init topology_init(void)
                 * CPU.  For instance, the boot cpu might never be valid
                 * for hotplugging.
                 */
-               if (ppc_md.cpu_die)
+               if (smp_ops->cpu_offline_self)
                        c->hotpluggable = 1;
+#endif
if (cpu_online(cpu) || c->hotpluggable) {
                        register_cpu(c, cpu);
diff --git a/arch/powerpc/platforms/85xx/smp.c 
b/arch/powerpc/platforms/85xx/smp.c
index fda108bae95f..c6df294054fe 100644
--- a/arch/powerpc/platforms/85xx/smp.c
+++ b/arch/powerpc/platforms/85xx/smp.c
@@ -112,7 +112,7 @@ static void mpc85xx_take_timebase(void)
        local_irq_restore(flags);
  }
-static void smp_85xx_mach_cpu_die(void)
+static void smp_85xx_cpu_offline_self(void)
  {
        unsigned int cpu = smp_processor_id();
@@ -506,7 +506,7 @@ void __init mpc85xx_smp_init(void)
        if (qoriq_pm_ops) {
                smp_85xx_ops.give_timebase = mpc85xx_give_timebase;
                smp_85xx_ops.take_timebase = mpc85xx_take_timebase;
-               ppc_md.cpu_die = smp_85xx_mach_cpu_die;
+               smp_85xx_ops.cpu_offline_self = smp_85xx_cpu_offline_self;
                smp_85xx_ops.cpu_die = qoriq_cpu_kill;
        }
  #endif
diff --git a/arch/powerpc/platforms/powermac/pmac.h 
b/arch/powerpc/platforms/powermac/pmac.h
index 16a52afdb76e..0d715db434dc 100644
--- a/arch/powerpc/platforms/powermac/pmac.h
+++ b/arch/powerpc/platforms/powermac/pmac.h
@@ -34,7 +34,7 @@ extern void pmac_check_ht_link(void);
extern void pmac_setup_smp(void);
  extern int psurge_secondary_virq;
-extern void low_cpu_die(void) __attribute__((noreturn));
+extern void low_cpu_offline_self(void) __attribute__((noreturn));
extern int pmac_nvram_init(void);
  extern void pmac_pic_init(void);
diff --git a/arch/powerpc/platforms/powermac/sleep.S 
b/arch/powerpc/platforms/powermac/sleep.S
index f9a680fdd9c4..c51bb63c9417 100644
--- a/arch/powerpc/platforms/powermac/sleep.S
+++ b/arch/powerpc/platforms/powermac/sleep.S
@@ -201,8 +201,8 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
        addi r3,r3,sleep_storage@l
        stw r5,0(r3)
- .globl low_cpu_die
-low_cpu_die:
+       .globl  low_cpu_offline_self
+low_cpu_offline_self:
        /* Flush & disable all caches */
        bl      flush_disable_caches
@@ -244,7 +244,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450)
        mtmsr   r2
        isync
        b       1b
-_ASM_NOKPROBE_SYMBOL(low_cpu_die)
+_ASM_NOKPROBE_SYMBOL(low_cpu_offline_self)
  /*
   * Here is the resume code.
   */
diff --git a/arch/powerpc/platforms/powermac/smp.c 
b/arch/powerpc/platforms/powermac/smp.c
index eb23264910e1..a6fedcfb714f 100644
--- a/arch/powerpc/platforms/powermac/smp.c
+++ b/arch/powerpc/platforms/powermac/smp.c
@@ -920,7 +920,7 @@ static int smp_core99_cpu_disable(void)
#ifdef CONFIG_PPC32 -static void pmac_cpu_die(void)
+static void pmac_cpu_offline_self(void)
  {
        int cpu = smp_processor_id();
@@ -930,12 +930,12 @@ static void pmac_cpu_die(void)
        generic_set_cpu_dead(cpu);
        smp_wmb();
        mb();
-       low_cpu_die();
+       low_cpu_offline_self();
  }
#else /* CONFIG_PPC32 */ -static void pmac_cpu_die(void)
+static void pmac_cpu_offline_self(void)
  {
        int cpu = smp_processor_id();
@@ -1020,7 +1020,7 @@ void __init pmac_setup_smp(void)
  #endif /* CONFIG_PPC_PMAC32_PSURGE */
#ifdef CONFIG_HOTPLUG_CPU
-       ppc_md.cpu_die = pmac_cpu_die;
+       smp_ops->cpu_offline_self = pmac_cpu_offline_self;
  #endif
  }
diff --git a/arch/powerpc/platforms/powernv/smp.c b/arch/powerpc/platforms/powernv/smp.c
index bbf361f23ae8..54c4ba45c7ce 100644
--- a/arch/powerpc/platforms/powernv/smp.c
+++ b/arch/powerpc/platforms/powernv/smp.c
@@ -158,7 +158,7 @@ static void pnv_flush_interrupts(void)
        }
  }
-static void pnv_smp_cpu_kill_self(void)
+static void pnv_cpu_offline_self(void)
  {
        unsigned long srr1, unexpected_mask, wmask;
        unsigned int cpu;
@@ -417,6 +417,7 @@ static struct smp_ops_t pnv_smp_ops = {
  #ifdef CONFIG_HOTPLUG_CPU
        .cpu_disable    = pnv_smp_cpu_disable,
        .cpu_die        = generic_cpu_die,
+       .cpu_offline_self = pnv_cpu_offline_self,
  #endif /* CONFIG_HOTPLUG_CPU */
  };
@@ -430,7 +431,6 @@ void __init pnv_smp_init(void)
        smp_ops = &pnv_smp_ops;
#ifdef CONFIG_HOTPLUG_CPU
-       ppc_md.cpu_die  = pnv_smp_cpu_kill_self;
  #ifdef CONFIG_KEXEC_CORE
        crash_wake_offline = 1;
  #endif
diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c 
b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index c6e0d8abf75e..43b020a30072 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -55,7 +55,7 @@ static void rtas_stop_self(void)
        panic("Alas, I survived.\n");
  }
-static void pseries_mach_cpu_die(void)
+static void pseries_cpu_offline_self(void)
  {
        unsigned int hwcpu = hard_smp_processor_id();
@@ -102,7 +102,7 @@ static int pseries_cpu_disable(void)
   * to self-destroy so that the cpu-offline thread can send the CPU_DEAD
   * notifications.
   *
- * OTOH, pseries_mach_cpu_die() is called by the @cpu when it wants to
+ * OTOH, pseries_cpu_offline_self() is called by the @cpu when it wants to
   * self-destruct.
   */
  static void pseries_cpu_die(unsigned int cpu)
@@ -895,7 +895,7 @@ static int __init pseries_cpu_hotplug_init(void)
                return 0;
        }
- ppc_md.cpu_die = pseries_mach_cpu_die;
+       smp_ops->cpu_offline_self = pseries_cpu_offline_self;
        smp_ops->cpu_disable = pseries_cpu_disable;
        smp_ops->cpu_die = pseries_cpu_die;

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