* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
* - Added _PDC for platforms with Intel CPUs
*/
+#include <linux/export.h>
#include <linux/dmi.h>
+#include <linux/slab.h>
#include <acpi/acpi_drivers.h>
#include <acpi/processor.h>
#define _COMPONENT ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("processor_core");
-static int set_no_mwait(const struct dmi_system_id *id)
+static int __init set_no_mwait(const struct dmi_system_id *id)
{
printk(KERN_NOTICE PREFIX "%s detected - "
"disabling mwait for CPU C-states\n", id->ident);
- idle_nomwait = 1;
+ boot_option_idle_override = IDLE_NOMWAIT;
return 0;
}
-static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
- {
- set_no_mwait, "IFL91 board", {
- DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
- DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
- DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
- DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
+static struct dmi_system_id __initdata processor_idle_dmi_table[] = {
{
set_no_mwait, "Extensa 5220", {
DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
{},
};
-#ifdef CONFIG_SMP
-static struct acpi_table_madt *madt;
-
static int map_lapic_id(struct acpi_subtable_header *entry,
u32 acpi_id, int *apic_id)
{
{
struct acpi_madt_local_sapic *lsapic =
(struct acpi_madt_local_sapic *)entry;
- u32 tmp = (lsapic->id << 8) | lsapic->eid;
- /* Only check enabled APICs*/
if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
return 0;
- /* Device statement declaration type */
if (device_declaration) {
- if (entry->length < 16)
- printk(KERN_ERR PREFIX
- "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
- tmp);
- else if (lsapic->uid == acpi_id)
- goto found;
- /* Processor statement declaration type */
- } else if (lsapic->processor_id == acpi_id)
- goto found;
+ if ((entry->length < 16) || (lsapic->uid != acpi_id))
+ return 0;
+ } else if (lsapic->processor_id != acpi_id)
+ return 0;
- return 0;
-found:
- *apic_id = tmp;
+ *apic_id = (lsapic->id << 8) | lsapic->eid;
return 1;
}
static int map_madt_entry(int type, u32 acpi_id)
{
unsigned long madt_end, entry;
+ static struct acpi_table_madt *madt;
+ static int read_madt;
int apic_id = -1;
+ if (!read_madt) {
+ if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
+ (struct acpi_table_header **)&madt)))
+ madt = NULL;
+ read_madt++;
+ }
+
if (!madt)
return apic_id;
int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
{
+#ifdef CONFIG_SMP
int i;
+#endif
int apic_id = -1;
apic_id = map_mat_entry(handle, type, acpi_id);
if (apic_id == -1)
apic_id = map_madt_entry(type, acpi_id);
- if (apic_id == -1)
- return apic_id;
+ if (apic_id == -1) {
+ /*
+ * On UP processor, there is no _MAT or MADT table.
+ * So above apic_id is always set to -1.
+ *
+ * BIOS may define multiple CPU handles even for UP processor.
+ * For example,
+ *
+ * Scope (_PR)
+ * {
+ * Processor (CPU0, 0x00, 0x00000410, 0x06) {}
+ * Processor (CPU1, 0x01, 0x00000410, 0x06) {}
+ * Processor (CPU2, 0x02, 0x00000410, 0x06) {}
+ * Processor (CPU3, 0x03, 0x00000410, 0x06) {}
+ * }
+ *
+ * Ignores apic_id and always returns 0 for the processor
+ * handle with acpi id 0 if nr_cpu_ids is 1.
+ * This should be the case if SMP tables are not found.
+ * Return -1 for other CPU's handle.
+ */
+ if (nr_cpu_ids <= 1 && acpi_id == 0)
+ return acpi_id;
+ else
+ return apic_id;
+ }
+#ifdef CONFIG_SMP
for_each_possible_cpu(i) {
if (cpu_physical_id(i) == apic_id)
return i;
}
+#else
+ /* In UP kernel, only processor 0 is valid */
+ if (apic_id == 0)
+ return apic_id;
+#endif
return -1;
}
EXPORT_SYMBOL_GPL(acpi_get_cpuid);
-#endif
-static bool processor_physically_present(acpi_handle handle)
+static bool __init processor_physically_present(acpi_handle handle)
{
int cpuid, type;
u32 acpi_id;
return true;
}
-static void acpi_set_pdc_bits(u32 *buf)
+static void __cpuinit acpi_set_pdc_bits(u32 *buf)
{
buf[0] = ACPI_PDC_REVISION_ID;
buf[1] = 1;
arch_acpi_set_pdc_bits(buf);
}
-static struct acpi_object_list *acpi_processor_alloc_pdc(void)
+static struct acpi_object_list *__cpuinit acpi_processor_alloc_pdc(void)
{
struct acpi_object_list *obj_list;
union acpi_object *obj;
* _PDC is required for a BIOS-OS handshake for most of the newer
* ACPI processor features.
*/
-static int
+static int __cpuinit
acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
{
acpi_status status = AE_OK;
- if (idle_nomwait) {
+ if (boot_option_idle_override == IDLE_NOMWAIT) {
/*
* If mwait is disabled for CPU C-states, the C2C3_FFH access
* mode will be disabled in the parameter of _PDC object.
return status;
}
-void acpi_processor_set_pdc(acpi_handle handle)
+void __cpuinit acpi_processor_set_pdc(acpi_handle handle)
{
struct acpi_object_list *obj_list;
kfree(obj_list->pointer);
kfree(obj_list);
}
-EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
-static acpi_status
+static acpi_status __init
early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
{
if (processor_physically_present(handle) == false)
void __init acpi_early_processor_set_pdc(void)
{
-
-#ifdef CONFIG_SMP
- if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
- (struct acpi_table_header **)&madt)))
- madt = NULL;
-#endif
-
/*
* Check whether the system is DMI table. If yes, OSPM
* should not use mwait for CPU-states.
acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX,
early_init_pdc, NULL, NULL, NULL);
+ acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL);
}