[Xen-devel] [PATCH v8 2/2] ARM: Enable selection of SMP operations at boot time

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

From: Jon Medhurst <tixy@xxxxxxxxxx>

Add a new 'smp_init' hook to machine_desc so platforms can specify a
function to be used to setup smp ops instead of having a statically
defined value.  The hook must return true when smp_ops are initialized.
If false the static mdesc->smp_ops will be used by default.

Signed-off-by: Jon Medhurst <tixy@xxxxxxxxxx>
Signed-off-by: Nicolas Pitre <nicolas.pitre@xxxxxxxxxx>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Reviewed-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
---
 arch/arm/include/asm/mach/arch.h |    4 ++++
 arch/arm/kernel/setup.c          |   10 ++++++----
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/arm/include/asm/mach/arch.h b/arch/arm/include/asm/mach/arch.h
index 308ad7d..4669e0b 100644
--- a/arch/arm/include/asm/mach/arch.h
+++ b/arch/arm/include/asm/mach/arch.h
@@ -16,8 +16,10 @@ struct pt_regs;
 struct smp_operations;
 #ifdef CONFIG_SMP
 #define smp_ops(ops) (&(ops))
+#define smp_init_ops(ops) (&(ops))
 #else
 #define smp_ops(ops) (struct smp_operations *)NULL
+#define smp_init_ops(ops) (bool (*)(void))NULL
 #endif
 
 struct machine_desc {
@@ -41,6 +43,8 @@ struct machine_desc {
        unsigned char           reserve_lp2 :1; /* never has lp2        */
        char                    restart_mode;   /* default restart mode */
        struct smp_operations   *smp;           /* SMP operations       */
+       /* Detect smp_ops dynamically, based on DT */
+       bool                    (*smp_init)(void);
        void                    (*fixup)(struct tag *, char **,
                                         struct meminfo *);
        void                    (*reserve)(void);/* reserve mem blocks  */
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index dad3048..22cc863 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -770,10 +770,12 @@ void __init setup_arch(char **cmdline_p)
        psci_init();
 #ifdef CONFIG_SMP
        if (is_smp()) {
-               if (psci_smp_available())
-                       smp_set_ops(&psci_smp_ops);
-               else if (mdesc->smp)
-                       smp_set_ops(mdesc->smp);
+               if (!mdesc->smp_init || !mdesc->smp_init()) {
+                       if (psci_smp_available())
+                               smp_set_ops(&psci_smp_ops);
+                       else if (mdesc->smp)
+                               smp_set_ops(mdesc->smp);
+               }
                smp_init_cpus();
        }
 #endif
-- 
1.7.2.5


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