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Commit 8ffdf50a authored by Abhimanyu Kapur's avatar Abhimanyu Kapur
Browse files

arm64: introduce CPU_OF_TABLES for cpu ops selection 



Add support to arm64 to provide a dt-based method to
allow soc-vendors to supply cpu_ops. Also move psci and
smp_spin_table ops to use CPU_OF_TABLES.

Change-Id: I4fd5b330fa3a7436fb88fff385deeb80a90548d6
Signed-off-by: default avatarAbhimanyu Kapur <abhimany@codeaurora.org>
parent 0e1e6dd9

arch/arm64/include/asm/cpu_ops.h

+5 −0
Original line number Diff line number Diff line
@@ -62,4 +62,9 @@ extern const struct cpu_operations *cpu_ops[NR_CPUS]; 
extern int __init cpu_read_ops(struct device_node *dn, int cpu);

extern void __init cpu_read_bootcpu_ops(void);



#define CPU_METHOD_OF_DECLARE(name, __ops)				\

	static const struct cpu_operations *__cpu_method_table_##name	\

	__used __section(__cpu_method_of_table)				\

	= __ops;



#endif /* ifndef __ASM_CPU_OPS_H */

arch/arm64/kernel/cpu_ops.c

+10 −19
Original line number Diff line number Diff line
@@ -22,29 +22,20 @@ 
#include <linux/of.h>

#include <linux/string.h>



extern const struct cpu_operations smp_spin_table_ops;

extern const struct cpu_operations cpu_psci_ops;



const struct cpu_operations *cpu_ops[NR_CPUS];

extern struct cpu_operations *__cpu_method_of_table[];

extern struct cpu_operations *__cpu_method_of_table_end[];



static const struct cpu_operations *supported_cpu_ops[] __initconst = {

#ifdef CONFIG_SMP

	&smp_spin_table_ops,

	&cpu_psci_ops,

#endif

	NULL,

};



static const struct cpu_operations * __init cpu_get_ops(const char *name)

const struct cpu_operations * __init cpu_get_ops(const char *name)

{

	const struct cpu_operations **ops = supported_cpu_ops;

	const struct cpu_operations **start = (void *)__cpu_method_of_table;

	const struct cpu_operations **end = (void *)__cpu_method_of_table_end;



	while (*ops) {

		if (!strcmp(name, (*ops)->name))

			return *ops;



		ops++;

	}

	while (start < end) {

		if (!strcmp((*start)->name, name))

			return *start;

		start++;

	};



	return NULL;

}

arch/arm64/kernel/psci.c

+2 −1
Original line number Diff line number Diff line
@@ -282,7 +282,7 @@ static void cpu_psci_cpu_die(unsigned int cpu) 
}

#endif



const struct cpu_operations cpu_psci_ops = {

static const struct cpu_operations cpu_psci_ops = {

	.name		= "psci",

	.cpu_init	= cpu_psci_cpu_init,

	.cpu_prepare	= cpu_psci_cpu_prepare,
@@ -293,4 +293,5 @@ const struct cpu_operations cpu_psci_ops = { 
#endif

};



CPU_METHOD_OF_DECLARE(psci, &cpu_psci_ops);

#endif

arch/arm64/kernel/smp_spin_table.c

+2 −1
Original line number Diff line number Diff line
@@ -142,10 +142,11 @@ void smp_spin_table_cpu_postboot(void) 
	raw_spin_unlock(&boot_lock);

}



const struct cpu_operations smp_spin_table_ops = {

static const struct cpu_operations smp_spin_table_ops = {

	.name		= "spin-table",

	.cpu_init	= smp_spin_table_cpu_init,

	.cpu_prepare	= smp_spin_table_cpu_prepare,

	.cpu_boot	= smp_spin_table_cpu_boot,

	.cpu_postboot	= smp_spin_table_cpu_postboot,

};

CPU_METHOD_OF_DECLARE(spin_table, &smp_spin_table_ops);

include/asm-generic/vmlinux.lds.h

+10 −0
Original line number Diff line number Diff line
@@ -171,6 +171,15 @@ 
#define CLK_OF_TABLES()

#endif



#ifdef CONFIG_OF

#define CPU_METHOD_OF_TABLES() . = ALIGN(8);				\

		VMLINUX_SYMBOL(__cpu_method_of_table) = .;		\

		*(__cpu_method_of_table)				\

		VMLINUX_SYMBOL(__cpu_method_of_table_end) = .;

#else

#define CPU_METHOD_OF_TABLES()

#endif



#define KERNEL_DTB()							\

	STRUCT_ALIGN();							\

	VMLINUX_SYMBOL(__dtb_start) = .;				\
@@ -515,6 +524,7 @@ 
	CPU_DISCARD(init.rodata)					\

	MEM_DISCARD(init.rodata)					\

	CLK_OF_TABLES()							\

	CPU_METHOD_OF_TABLES()						\

	CLKSRC_OF_TABLES()						\

	KERNEL_DTB()							\

	IRQCHIP_OF_MATCH_TABLE()