ARM: SoC: add per-platform SMP operations
This adds a 'struct smp_operations' to abstract the CPU initialization
and hot plugging functions on SMP systems, which otherwise conflict
in a multiplatform kernel. This also helps shmobile and potentially
others that have more than one method to do these.
To allow the kernel to continue building, the platform hooks are
defined as weak symbols which are overrided by the platform code.
Once all platforms are converted, the "weak" attribute will be
removed and the function made static.
Unlike the original version from Marc, this new version from Arnd
does not use a generalized abstraction for per-soc data structures
but only tries to solve the problem for the SMP operations. This
way, we can collapse the previous four data structures into a
single struct, which is less systematic but also easier to follow
as a causal reader.
Change-Id: I9d022d4e789f8f87f26a237fa2e9e410be070976
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
[rameezmustafa@codeaurora.org: backport to kernel 3.4]
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
diff --git a/arch/arm/include/asm/mach/arch.h b/arch/arm/include/asm/mach/arch.h
index 669a626..6ea1a1e 100644
--- a/arch/arm/include/asm/mach/arch.h
+++ b/arch/arm/include/asm/mach/arch.h
@@ -14,6 +14,12 @@
struct meminfo;
struct sys_timer;
struct pt_regs;
+struct smp_operations;
+#ifdef CONFIG_SMP
+#define smp_ops(ops) (&(ops))
+#else
+#define smp_ops(ops) (struct smp_operations *)NULL
+#endif
struct machine_desc {
unsigned int nr; /* architecture number */
@@ -35,6 +41,7 @@
unsigned char reserve_lp1 :1; /* never has lp1 */
unsigned char reserve_lp2 :1; /* never has lp2 */
char restart_mode; /* default restart mode */
+ struct smp_operations *smp; /* SMP operations */
void (*fixup)(struct tag *, char **,
struct meminfo *);
void (*reserve)(void);/* reserve mem blocks */
diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h
index 7f74b59..581f4fa 100644
--- a/arch/arm/include/asm/smp.h
+++ b/arch/arm/include/asm/smp.h
@@ -95,4 +95,37 @@
extern void smp_send_all_cpu_backtrace(void);
+struct smp_operations {
+#ifdef CONFIG_SMP
+/*
+ * Setup the set of possible CPUs (via set_cpu_possible)
+ */
+void (*smp_init_cpus)(void);
+/*
+ * Initialize cpu_possible map, and enable coherency
+ */
+void (*smp_prepare_cpus)(unsigned int max_cpus);
+
+/*
+ * Perform platform specific initialisation of the specified CPU.
+ */
+void (*smp_secondary_init)(unsigned int cpu);
+/*
+ * Boot a secondary CPU, and assign it the specified idle task.
+ * This also gives us the initial stack to use for this CPU.
+ */
+int (*smp_boot_secondary)(unsigned int cpu, struct task_struct *idle);
+#ifdef CONFIG_HOTPLUG_CPU
+int (*cpu_kill)(unsigned int cpu);
+void (*cpu_die)(unsigned int cpu);
+int (*cpu_disable)(unsigned int cpu);
+#endif
+#endif
+};
+
+/*
+ * set platform specific SMP operations
+ */
+extern void smp_set_ops(struct smp_operations *);
+
#endif /* ifndef __ASM_ARM_SMP_H */
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index b012f0f..4aabf0e 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -974,8 +974,10 @@
unflatten_device_tree();
#ifdef CONFIG_SMP
- if (is_smp())
+ if (is_smp()) {
+ smp_set_ops(mdesc->smp);
smp_init_cpus();
+ }
#endif
reserve_crashkernel();
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index e46fd92..dea0f1f 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -19,7 +19,6 @@
#include <linux/mm.h>
#include <linux/err.h>
#include <linux/cpu.h>
-#include <linux/smp.h>
#include <linux/seq_file.h>
#include <linux/irq.h>
#include <linux/percpu.h>
@@ -27,6 +26,7 @@
#include <linux/completion.h>
#include <linux/atomic.h>
+#include <asm/smp.h>
#include <asm/cacheflush.h>
#include <asm/cpu.h>
#include <asm/cputype.h>
@@ -42,6 +42,7 @@
#include <asm/ptrace.h>
#include <asm/localtimer.h>
#include <asm/smp_plat.h>
+#include <asm/mach/arch.h>
/*
* as from 2.5, kernels no longer have an init_tasks structure
@@ -62,6 +63,14 @@
static DECLARE_COMPLETION(cpu_running);
+static struct smp_operations smp_ops;
+
+void __init smp_set_ops(struct smp_operations *ops)
+{
+ if (ops)
+ smp_ops = *ops;
+};
+
int __cpuinit __cpu_up(unsigned int cpu)
{
struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu);
@@ -123,9 +132,61 @@
return ret;
}
+/* platform specific SMP operations */
+void __attribute__((weak)) __init smp_init_cpus(void)
+{
+ if (smp_ops.smp_init_cpus)
+ smp_ops.smp_init_cpus();
+}
+
+void __attribute__((weak)) __init platform_smp_prepare_cpus(unsigned int max_cpus)
+{
+ if (smp_ops.smp_prepare_cpus)
+ smp_ops.smp_prepare_cpus(max_cpus);
+}
+
+void __attribute__((weak)) __cpuinit platform_secondary_init(unsigned int cpu)
+{
+ if (smp_ops.smp_secondary_init)
+ smp_ops.smp_secondary_init(cpu);
+}
+
+int __attribute__((weak)) __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+ if (smp_ops.smp_boot_secondary)
+ return smp_ops.smp_boot_secondary(cpu, idle);
+ return -ENOSYS;
+}
+
#ifdef CONFIG_HOTPLUG_CPU
static void percpu_timer_stop(void);
+int __attribute__((weak)) platform_cpu_kill(unsigned int cpu)
+{
+ if (smp_ops.cpu_kill)
+ return smp_ops.cpu_kill(cpu);
+ return 1;
+}
+
+void __attribute__((weak)) platform_cpu_die(unsigned int cpu)
+{
+ if (smp_ops.cpu_die)
+ smp_ops.cpu_die(cpu);
+}
+
+int __attribute__((weak)) platform_cpu_disable(unsigned int cpu)
+{
+ if (smp_ops.cpu_disable)
+ return smp_ops.cpu_disable(cpu);
+
+ /*
+ * By default, allow disabling all CPUs except the first one,
+ * since this is special on a lot of platforms, e.g. because
+ * of clock tick interrupts.
+ */
+ return cpu == 0 ? -EPERM : 0;
+}
+
/*
* __cpu_disable runs on the processor to be shutdown.
*/