ACPI / scan: bail out early if failed to parse APIC ID for CPU

Enhance ACPI CPU hotplug driver to print clear error message and
bail out early if BIOS returns wrong value in ACPI MADT table or
_MAT method. Otherwise it will add the CPU device even if failed
to get APIC ID and fails any operations against sysfs interface:
/sys/devices/system/cpu/cpux/online

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jiang Liu 2014-01-09 16:15:19 +08:00 committed by Rafael J. Wysocki
parent d6e0a2dd12
commit b981513f80

View File

@ -212,7 +212,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
union acpi_object object = { 0 }; union acpi_object object = { 0 };
struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
struct acpi_processor *pr = acpi_driver_data(device); struct acpi_processor *pr = acpi_driver_data(device);
int cpu_index, device_declaration = 0; int apic_id, cpu_index, device_declaration = 0;
acpi_status status = AE_OK; acpi_status status = AE_OK;
static int cpu0_initialized; static int cpu0_initialized;
unsigned long long value; unsigned long long value;
@ -258,18 +258,21 @@ static int acpi_processor_get_info(struct acpi_device *device)
device_declaration = 1; device_declaration = 1;
pr->acpi_id = value; pr->acpi_id = value;
} }
pr->apic_id = acpi_get_apicid(pr->handle, device_declaration,
pr->acpi_id);
cpu_index = acpi_map_cpuid(pr->apic_id, pr->acpi_id);
/* Handle UP system running SMP kernel, with no LAPIC in MADT */ apic_id = acpi_get_apicid(pr->handle, device_declaration, pr->acpi_id);
if (!cpu0_initialized && (cpu_index == -1) && if (apic_id < 0) {
(num_online_cpus() == 1)) { acpi_handle_err(pr->handle, "failed to get CPU APIC ID.\n");
cpu_index = 0; return -ENODEV;
} }
pr->apic_id = apic_id;
cpu0_initialized = 1; cpu_index = acpi_map_cpuid(pr->apic_id, pr->acpi_id);
if (!cpu0_initialized) {
cpu0_initialized = 1;
/* Handle UP system running SMP kernel, with no LAPIC in MADT */
if ((cpu_index == -1) && (num_online_cpus() == 1))
cpu_index = 0;
}
pr->id = cpu_index; pr->id = cpu_index;
/* /*
@ -282,6 +285,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
if (ret) if (ret)
return ret; return ret;
} }
/* /*
* On some boxes several processors use the same processor bus id. * On some boxes several processors use the same processor bus id.
* But they are located in different scope. For example: * But they are located in different scope. For example: