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Subject[RFC PATCH 3/5] arm64: introduce CPU_OF_TABLES for cpu ops selection
Date
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.

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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