linux-kernel - [RFC PATCH v2 17/35] ACPI: processor: Register all CPUs from acpi_processor_get

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Message-Id: <20230913163823.7880-18-james.morse@arm.com>
Date:   Wed, 13 Sep 2023 16:38:05 +0000
From:   James Morse <james.morse@....com>
To:     linux-pm@...r.kernel.org, loongarch@...ts.linux.dev,
        linux-acpi@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, kvmarm@...ts.linux.dev
Cc:     x86@...nel.org, Salil Mehta <salil.mehta@...wei.com>,
        Russell King <linux@...linux.org.uk>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        jianyong.wu@....com, justin.he@....com
Subject: [RFC PATCH v2 17/35] ACPI: processor: Register all CPUs from acpi_processor_get_info()

To allow ACPI to skip the call to arch_register_cpu() when the _STA
value indicates the CPU can't be brought online right now, move the
arch_register_cpu() call into acpi_processor_get_info().

Systems can still be booted with 'acpi=off', or not include an
ACPI description at all. For these, the CPUs continue to be
registered by cpu_dev_register_generic().

This moves the CPU register logic back to a subsys_initcall(),
while the memory nodes will have been registered earlier.

Signed-off-by: James Morse <james.morse@....com>
---
 drivers/acpi/acpi_processor.c | 13 +++++++++++++
 drivers/base/cpu.c            |  2 +-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index a01e315aa16a..867782bc50b0 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -313,6 +313,19 @@ static int acpi_processor_get_info(struct acpi_device *device)
 			cpufreq_add_device("acpi-cpufreq");
 	}
 
+	/*
+	 * Register CPUs that are present.
+	 * Use get_cpu_device() to skip duplicate CPU descriptions from
+	 * firmware.
+	 */
+	if (!invalid_logical_cpuid(pr->id) && cpu_present(pr->id) &&
+	    !get_cpu_device(pr->id)) {
+		int ret = arch_register_cpu(pr->id);
+
+		if (ret)
+			return ret;
+	}
+
 	/*
 	 *  Extra Processor objects may be enumerated on MP systems with
 	 *  less than the max # of CPUs. They should be ignored _iff
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index d31c936f0955..677f963e02ce 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -537,7 +537,7 @@ static void __init cpu_dev_register_generic(void)
 {
 	int i, ret;
 
-	if (!IS_ENABLED(CONFIG_GENERIC_CPU_DEVICES))
+	if (!IS_ENABLED(CONFIG_GENERIC_CPU_DEVICES) || !acpi_disabled)
 		return;
 
 	for_each_present_cpu(i) {
-- 
2.39.2