From 5d554a7bb0643a6151a84319bfeba8270bf5269e Mon Sep 17 00:00:00 2001 From: Alex Chiang Date: Mon, 22 Feb 2010 12:11:29 -0700 Subject: [PATCH] ACPI: processor: add internal processor_physically_present() Detect if a processor is physically present before evaluating _PDC. We want this because some BIOS will provide a _PDC even for processors that are not present. These bogus _PDC methods then attempt to load non-existent tables, which causes problems. Avoid those bogus landmines. Acked-by: Venkatesh Pallipadi Signed-off-by: Alex Chiang Signed-off-by: Len Brown --- drivers/acpi/processor_core.c | 42 +++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c index 9ae5cc21f258..f0c68c1b86dd 100644 --- a/drivers/acpi/processor_core.c +++ b/drivers/acpi/processor_core.c @@ -194,6 +194,45 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) EXPORT_SYMBOL_GPL(acpi_get_cpuid); #endif +static bool 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 = { 0 }; + 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, "_UID", NULL, &tmp); + if (ACPI_FAILURE(status)) + return false; + acpi_id = tmp; + break; + default: + return false; + } + + type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; + cpuid = acpi_get_cpuid(handle, type, acpi_id); + + if (cpuid == -1) + return false; + + return true; +} static void acpi_set_pdc_bits(u32 *buf) { @@ -335,6 +374,9 @@ static struct dmi_system_id __cpuinitdata early_pdc_optin_table[] = { static acpi_status early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) { + if (processor_physically_present(handle) == false) + return AE_OK; + acpi_processor_set_pdc(handle); return AE_OK; } -- 2.20.1