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SubjectRe: [RFC PATCH 3/5] arm64: introduce CPU_OF_TABLES for cpu ops selection
On Thu, Apr 09, 2015 at 06:37:09PM +0100, Kumar Gala wrote:
> From: Abhimanyu Kapur <abhimany@codeaurora.org>
>
> 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.

On arm64 there are two enable methods: PSCI and spin-table.

Update your firmware accordingly and drop this patch, thanks.

Lorenzo

> Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>
> Signed-off-by: Kumar Gala <galak@codeaurora.org>
> ---
> arch/arm64/include/asm/cpu_ops.h | 5 +++++
> arch/arm64/kernel/cpu_ops.c | 27 +++++++++------------------
> arch/arm64/kernel/psci.c | 1 +
> arch/arm64/kernel/smp_spin_table.c | 3 ++-
> 4 files changed, 17 insertions(+), 19 deletions(-)
>
> diff --git a/arch/arm64/include/asm/cpu_ops.h b/arch/arm64/include/asm/cpu_ops.h
> index da301ee..a7efab8 100644
> --- a/arch/arm64/include/asm/cpu_ops.h
> +++ b/arch/arm64/include/asm/cpu_ops.h
> @@ -67,4 +67,9 @@ extern const struct cpu_operations *cpu_ops[NR_CPUS];
> int __init cpu_read_ops(struct device_node *dn, int cpu);
> 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 */
> diff --git a/arch/arm64/kernel/cpu_ops.c b/arch/arm64/kernel/cpu_ops.c
> index cce9524..ad33f98 100644
> --- a/arch/arm64/kernel/cpu_ops.c
> +++ b/arch/arm64/kernel/cpu_ops.c
> @@ -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];
>
> -static const struct cpu_operations *supported_cpu_ops[] __initconst = {
> -#ifdef CONFIG_SMP
> - &smp_spin_table_ops,
> -#endif
> - &cpu_psci_ops,
> - NULL,
> -};
> +extern struct cpu_operations __cpu_method_of_table[];
> +static const struct cpu_operations *__cpu_method_of_table_sentinel
> + __used __section(__cpu_method_of_table_end);
>
> -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;
> -
> - while (*ops) {
> - if (!strcmp(name, (*ops)->name))
> - return *ops;
> + const struct cpu_operations **start = (void *)__cpu_method_of_table;
>
> - ops++;
> - }
> + for (; *start; start++) {
> + if (!strcmp((*start)->name, name))
> + return *start;
> + };
>
> return NULL;
> }
> diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c
> index 9b8a70a..2f255c7 100644
> --- a/arch/arm64/kernel/psci.c
> +++ b/arch/arm64/kernel/psci.c
> @@ -523,3 +523,4 @@ const struct cpu_operations cpu_psci_ops = {
> #endif
> };
>
> +CPU_METHOD_OF_DECLARE(psci, &cpu_psci_ops);
> diff --git a/arch/arm64/kernel/smp_spin_table.c b/arch/arm64/kernel/smp_spin_table.c
> index 14944e5..b41a8b4 100644
> --- a/arch/arm64/kernel/smp_spin_table.c
> +++ b/arch/arm64/kernel/smp_spin_table.c
> @@ -119,9 +119,10 @@ static int smp_spin_table_cpu_boot(unsigned int cpu)
> return 0;
> }
>
> -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_METHOD_OF_DECLARE(spin_table, &smp_spin_table_ops);
> --
> Qualcomm Innovation Center, Inc.
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
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