x86, ACPI: add support for x2apic ACPI extensions

All logical processors with APIC ID values of 255 and greater will have their
APIC reported through Processor X2APIC structure (type-9 entry type) and all
logical processors with APIC ID less than 255 will have their APIC reported
through legacy Processor Local APIC (type-0 entry type) only. This is the
same case even for NMI structure reporting.
    
The Processor X2APIC Affinity structure provides the association between the
X2APIC ID of a logical processor and the proximity domain to which the logical
processor belongs.
    
For OSPM, Procssor IDs outside the 0-254 range are to be declared as Device()
objects in the ACPI namespace.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 101 insertions, 1 deletions

diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
index 3a0d8ef25c75..d440ccd27d91 100644
--- a/drivers/acpi/numa.c
+++ b/drivers/acpi/numa.c
@@ -131,6 +131,21 @@ acpi_table_print_srat_entry(struct acpi_subtable_header *header)
 #endif				/* ACPI_DEBUG_OUTPUT */
 		break;
 
+	case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
+#ifdef ACPI_DEBUG_OUTPUT
+		{
+			struct acpi_srat_x2apic_cpu_affinity *p =
+			    (struct acpi_srat_x2apic_cpu_affinity *)header;
+			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+					  "SRAT Processor (x2apicid[0x%08x]) in"
+					  " proximity domain %d %s\n",
+					  p->apic_id,
+					  p->proximity_domain,
+					  (p->flags & ACPI_SRAT_CPU_ENABLED) ?
+					  "enabled" : "disabled"));
+		}
+#endif				/* ACPI_DEBUG_OUTPUT */
+		break;
 	default:
 		printk(KERN_WARNING PREFIX
 		       "Found unsupported SRAT entry (type = 0x%x)\n",
@@ -180,8 +195,35 @@ static int __init acpi_parse_slit(struct acpi_table_header *table)
 	return 0;
 }
 
+void __init __attribute__ ((weak))
+acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
+{
+	printk(KERN_WARNING PREFIX
+	       "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
+	return;
+}
+
+
+static int __init
+acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
+			   const unsigned long end)
+{
+	struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
+
+	processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
+	if (!processor_affinity)
+		return -EINVAL;
+
+	acpi_table_print_srat_entry(header);
+
+	/* let architecture-dependent part to do it */
+	acpi_numa_x2apic_affinity_init(processor_affinity);
+
+	return 0;
+}
+
 static int __init
-acpi_parse_processor_affinity(struct acpi_subtable_header * header,
+acpi_parse_processor_affinity(struct acpi_subtable_header *header,
 			      const unsigned long end)
 {
 	struct acpi_srat_cpu_affinity *processor_affinity;
@@ -241,6 +283,8 @@ int __init acpi_numa_init(void)
 {
 	/* SRAT: Static Resource Affinity Table */
 	if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
+		acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
+				      acpi_parse_x2apic_affinity, NR_CPUS);
 		acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 				      acpi_parse_processor_affinity, NR_CPUS);
 		acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 0cc2fd31e376..775324e34ffa 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -427,6 +427,29 @@ static int map_lapic_id(struct acpi_subtable_header *entry,
 	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)
 {
@@ -476,6 +499,9 @@ static int map_madt_entry(int type, u32 acpi_id)
 		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;
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index a8852952fac4..991c006a301b 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -62,6 +62,18 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
 		}
 		break;
 
+	case ACPI_MADT_TYPE_LOCAL_X2APIC:
+		{
+			struct acpi_madt_local_x2apic *p =
+			    (struct acpi_madt_local_x2apic *)header;
+			printk(KERN_INFO PREFIX
+			       "X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
+			       p->local_apic_id, p->uid,
+			       (p->lapic_flags & ACPI_MADT_ENABLED) ?
+			       "enabled" : "disabled");
+		}
+		break;
+
 	case ACPI_MADT_TYPE_IO_APIC:
 		{
 			struct acpi_madt_io_apic *p =
@@ -116,6 +128,24 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
 		}
 		break;
 
+	case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
+		{
+			u16 polarity, trigger;
+			struct acpi_madt_local_x2apic_nmi *p =
+			    (struct acpi_madt_local_x2apic_nmi *)header;
+
+			polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
+			trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
+
+			printk(KERN_INFO PREFIX
+			       "X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
+			       p->uid,
+			       mps_inti_flags_polarity[polarity],
+			       mps_inti_flags_trigger[trigger],
+			       p->lint);
+		}
+		break;
+
 	case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
 		{
 			struct acpi_madt_local_apic_override *p =