If CONFIG_ACPI_PROCESSOR provide a helper to retriever the
acpi_handle for a given CPU allowing access to methods
in DSDT.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
---
v6: New patch
---
drivers/acpi/acpi_processor.c | 10 ++++++++++
include/linux/acpi.h | 7 +++++++
2 files changed, 17 insertions(+)
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 2c164451ab53..7ecb13775d7f 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -35,6 +35,16 @@ EXPORT_PER_CPU_SYMBOL(processors);
struct acpi_processor_errata errata __read_mostly;
EXPORT_SYMBOL_GPL(errata);
+acpi_handle acpi_get_processor_handle(int cpu)
+{
+ acpi_handle handle = NULL;
+ struct acpi_processor *pr = per_cpu(processors, cpu);;
+
+ if (pr)
+ handle = pr->handle;
+
+ return handle;
+}
static int acpi_processor_errata_piix4(struct pci_dev *dev)
{
u8 value1 = 0;
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 34829f2c517a..9844a3f9c4e5 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -309,6 +309,8 @@ int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
int acpi_unmap_cpu(int cpu);
#endif /* CONFIG_ACPI_HOTPLUG_CPU */
+acpi_handle acpi_get_processor_handle(int cpu);
+
#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr);
#endif
@@ -1077,6 +1079,11 @@ static inline bool acpi_sleep_state_supported(u8 sleep_state)
return false;
}
+static inline acpi_handle acpi_get_processor_handle(int cpu)
+{
+ return NULL;
+}
+
#endif /* !CONFIG_ACPI */
extern void arch_post_acpi_subsys_init(void);
--
2.39.2
