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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 <venkatesh.pallipadi@intel.com> Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -194,6 +194,45 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
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EXPORT_SYMBOL_GPL(acpi_get_cpuid);
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#endif
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static bool processor_physically_present(acpi_handle handle)
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{
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int cpuid, type;
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u32 acpi_id;
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acpi_status status;
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acpi_object_type acpi_type;
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unsigned long long tmp;
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union acpi_object object = { 0 };
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struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
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status = acpi_get_type(handle, &acpi_type);
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if (ACPI_FAILURE(status))
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return false;
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switch (acpi_type) {
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case ACPI_TYPE_PROCESSOR:
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status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
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if (ACPI_FAILURE(status))
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return false;
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acpi_id = object.processor.proc_id;
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break;
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case ACPI_TYPE_DEVICE:
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status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
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if (ACPI_FAILURE(status))
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return false;
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acpi_id = tmp;
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break;
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default:
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return false;
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}
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type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
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cpuid = acpi_get_cpuid(handle, type, acpi_id);
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if (cpuid == -1)
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return false;
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return true;
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}
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static void acpi_set_pdc_bits(u32 *buf)
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{
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@ -335,6 +374,9 @@ static struct dmi_system_id __cpuinitdata early_pdc_optin_table[] = {
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static acpi_status
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early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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if (processor_physically_present(handle) == false)
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return AE_OK;
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acpi_processor_set_pdc(handle);
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return AE_OK;
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}
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