ACPI: processor: move acpi_get_cpuid into processor_core.c

Enumerating processors (via MADT/_MAT) belongs in the processor core,
which is always built-in, rather than living in the processor driver
which may not be built.

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>

1 files changed, 160 insertions, 0 deletions

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 6f376bf42904..9ae5cc21f258 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -42,6 +42,159 @@ static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
         {},
 };
 
+#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_apic *lapic =
+                (struct acpi_madt_local_apic *)entry;
+        if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
+            lapic->processor_id == acpi_id) {
+                *apic_id = lapic->id;
+                return 1;
+        }
+        return 0;
+}
+
+static int map_x2apic_id(struct acpi_subtable_header *entry,
+                         int device_declaration, u32 acpi_id, int *apic_id)
+{
+        struct acpi_madt_local_x2apic *apic =
+                (struct acpi_madt_local_x2apic *)entry;
+        u32 tmp = apic->local_apic_id;
+
+        /* Only check enabled APICs*/
+        if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
+                return 0;
+
+        /* Device statement declaration type */
+        if (device_declaration) {
+                if (apic->uid == acpi_id)
+                        goto found;
+        }
+
+        return 0;
+found:
+        *apic_id = tmp;
+        return 1;
+}
+
+static int map_lsapic_id(struct acpi_subtable_header *entry,
+                int device_declaration, 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;
+
+        return 0;
+found:
+        *apic_id = tmp;
+        return 1;
+}
+
+static int map_madt_entry(int type, u32 acpi_id)
+{
+        unsigned long madt_end, entry;
+        int apic_id = -1;
+
+        if (!madt)
+                return apic_id;
+
+        entry = (unsigned long)madt;
+        madt_end = entry + madt->header.length;
+
+        /* Parse all entries looking for a match. */
+
+        entry += sizeof(struct acpi_table_madt);
+        while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
+                struct acpi_subtable_header *header =
+                        (struct acpi_subtable_header *)entry;
+                if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
+                        if (map_lapic_id(header, acpi_id, &apic_id))
+                                break;
+                } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
+                        if (map_x2apic_id(header, type, acpi_id, &apic_id))
+                                break;
+                } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
+                        if (map_lsapic_id(header, type, acpi_id, &apic_id))
+                                break;
+                }
+                entry += header->length;
+        }
+        return apic_id;
+}
+
+static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
+{
+        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+        union acpi_object *obj;
+        struct acpi_subtable_header *header;
+        int apic_id = -1;
+
+        if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
+                goto exit;
+
+        if (!buffer.length || !buffer.pointer)
+                goto exit;
+
+        obj = buffer.pointer;
+        if (obj->type != ACPI_TYPE_BUFFER ||
+            obj->buffer.length < sizeof(struct acpi_subtable_header)) {
+                goto exit;
+        }
+
+        header = (struct acpi_subtable_header *)obj->buffer.pointer;
+        if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
+                map_lapic_id(header, acpi_id, &apic_id);
+        } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
+                map_lsapic_id(header, type, acpi_id, &apic_id);
+        }
+
+exit:
+        if (buffer.pointer)
+                kfree(buffer.pointer);
+        return apic_id;
+}
+
+int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
+{
+        int i;
+        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;
+
+        for_each_possible_cpu(i) {
+                if (cpu_physical_id(i) == apic_id)
+                        return i;
+        }
+        return -1;
+}
+EXPORT_SYMBOL_GPL(acpi_get_cpuid);
+#endif
+
+
 static void acpi_set_pdc_bits(u32 *buf)
 {
         buf[0] = ACPI_PDC_REVISION_ID;
@@ -188,6 +341,13 @@ early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
 
 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.