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From:   Xiongfeng Wang <wangxiongfeng2@huawei.com>
To:     <rjw@rjwysocki.net>, <catalin.marinas@arm.com>,
        <james.morse@arm.com>
CC:     <linux-acpi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <guohanjun@huawei.com>,
        <xiexiuqi@huawei.com>, <huawei.libin@huawei.com>,
        <john.garry@huawei.com>, <jonathan.cameron@huawei.com>,
        <wangxiongfeng2@huawei.com>
Subject: [PATCH RFC 3/3] arm64: Add CPU hotplug support
Date:   Fri, 28 Jun 2019 19:13:12 +0800
Message-ID: <1561720392-45907-4-git-send-email-wangxiongfeng2@huawei.com>
In-Reply-To: <1561720392-45907-1-git-send-email-wangxiongfeng2@huawei.com>
References: <1561720392-45907-1-git-send-email-wangxiongfeng2@huawei.com>
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To support CPU hotplug, we need to implement 'acpi_(un)map_cpu()' and
'arch_(un)register_cpu()' for ARM64. These functions are called in
'acpi_processor_hotadd_init()/acpi_processor_remove()' when the CPU is hot
added into or hot removed from the system.

Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
---
 arch/arm64/kernel/acpi.c  | 22 ++++++++++++++++++++++
 arch/arm64/kernel/setup.c | 17 +++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index ed46dc1..0e7b4f5 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -28,6 +28,7 @@
 #include <linux/smp.h>
 #include <linux/serial_core.h>
 
+#include <acpi/processor.h>
 #include <asm/cputype.h>
 #include <asm/cpu_ops.h>
 #include <asm/pgtable.h>
@@ -257,3 +258,24 @@ pgprot_t __acpi_get_mem_attribute(phys_addr_t addr)
 		return __pgprot(PROT_NORMAL_NC);
 	return __pgprot(PROT_DEVICE_nGnRnE);
 }
+
+int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
+		 int *pcpu)
+{
+	int cpu;
+
+	cpu = acpi_map_cpuid(physid, acpi_id);
+	*pcpu = cpu;
+	set_cpu_present(cpu, true);
+
+	return 0;
+}
+EXPORT_SYMBOL(acpi_map_cpu);
+
+int acpi_unmap_cpu(int cpu)
+{
+	set_cpu_present(cpu, false);
+
+	return 0;
+}
+EXPORT_SYMBOL(acpi_unmap_cpu);
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index a82d0c2..7b1a675 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -429,3 +429,20 @@ static int __init register_kernel_offset_dumper(void)
 	return 0;
 }
 __initcall(register_kernel_offset_dumper);
+
+int arch_register_cpu(int num)
+{
+	struct cpu *cpu = &per_cpu(cpu_data.cpu, num);
+
+	cpu->hotpluggable = 1;
+	return register_cpu(cpu, num);
+}
+EXPORT_SYMBOL(arch_register_cpu);
+
+void arch_unregister_cpu(int num)
+{
+	struct cpu *cpu = &per_cpu(cpu_data.cpu, num);
+
+	unregister_cpu(cpu);
+}
+EXPORT_SYMBOL(arch_unregister_cpu);
-- 
1.7.12.4