From 3272a4aadc4c91f1f9518cf6638e7e81f9ac0336 Mon Sep 17 00:00:00 2001
From: Michal Wilczynski <michal.wilczynski@intel.com>
Date: Mon, 10 Jul 2023 17:03:30 +0300
Subject: ACPI: processor: Move processor_physically_present() to
 acpi_processor.c

Since _PDC method is deprecated and a preferred method of communicating
OSPM processor power management capabilities is _OSC, there is a need to
move function checking whether processor is present as this logic is not
_PDC specific.

Move processor_physically_present() to acpi_processor.c.

No intentional functional impact.

Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/acpi_processor.c | 52 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

(limited to 'drivers/acpi/acpi_processor.c')

diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index f9aa02cac6d1..ebb4efd3d0aa 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -12,6 +12,7 @@
 
 #include <linux/acpi.h>
 #include <linux/device.h>
+#include <linux/dmi.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
@@ -21,6 +22,8 @@
 
 #include <asm/cpu.h>
 
+#include <xen/xen.h>
+
 #include "internal.h"
 
 DEFINE_PER_CPU(struct acpi_processor *, processors);
@@ -508,7 +511,54 @@ static void acpi_processor_remove(struct acpi_device *device)
 }
 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
 
-#ifdef CONFIG_X86
+#ifdef CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC
+bool __init processor_physically_present(acpi_handle handle)
+{
+	int cpuid, type;
+	u32 acpi_id;
+	acpi_status status;
+	acpi_object_type acpi_type;
+	unsigned long long tmp;
+	union acpi_object object = {};
+	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
+
+	status = acpi_get_type(handle, &acpi_type);
+	if (ACPI_FAILURE(status))
+		return false;
+
+	switch (acpi_type) {
+	case ACPI_TYPE_PROCESSOR:
+		status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
+		if (ACPI_FAILURE(status))
+			return false;
+		acpi_id = object.processor.proc_id;
+		break;
+	case ACPI_TYPE_DEVICE:
+		status = acpi_evaluate_integer(handle, METHOD_NAME__UID,
+					       NULL, &tmp);
+		if (ACPI_FAILURE(status))
+			return false;
+		acpi_id = tmp;
+		break;
+	default:
+		return false;
+	}
+
+	if (xen_initial_domain())
+		/*
+		 * When running as a Xen dom0 the number of processors Linux
+		 * sees can be different from the real number of processors on
+		 * the system, and we still need to execute _PDC or _OSC for
+		 * all of them.
+		 */
+		return xen_processor_present(acpi_id);
+
+	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
+	cpuid = acpi_get_cpuid(handle, type, acpi_id);
+
+	return !invalid_logical_cpuid(cpuid);
+}
+
 static bool acpi_hwp_native_thermal_lvt_set;
 static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle,
 							  u32 lvl,
-- 
cgit