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>

6 files changed, 191 insertions, 5 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 7678f10c456..565e70c7ca9 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -260,6 +260,35 @@ static void __cpuinit acpi_register_lapic(int id, u8 enabled)
 }
 
 static int __init
+acpi_parse_x2apic(struct acpi_subtable_header *header, const unsigned long end)
+{
+        struct acpi_madt_local_x2apic *processor = NULL;
+
+        processor = (struct acpi_madt_local_x2apic *)header;
+
+        if (BAD_MADT_ENTRY(processor, end))
+                return -EINVAL;
+
+        acpi_table_print_madt_entry(header);
+
+#ifdef CONFIG_X86_X2APIC
+        /*
+         * We need to register disabled CPU as well to permit
+         * counting disabled CPUs. This allows us to size
+         * cpus_possible_map more accurately, to permit
+         * to not preallocating memory for all NR_CPUS
+         * when we use CPU hotplug.
+         */
+        acpi_register_lapic(processor->local_apic_id,   /* APIC ID */
+                            processor->lapic_flags & ACPI_MADT_ENABLED);
+#else
+        printk(KERN_WARNING PREFIX "x2apic entry ignored\n");
+#endif
+
+        return 0;
+}
+
+static int __init
 acpi_parse_lapic(struct acpi_subtable_header * header, const unsigned long end)
 {
         struct acpi_madt_local_apic *processor = NULL;
@@ -319,6 +348,25 @@ acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 }
 
 static int __init
+acpi_parse_x2apic_nmi(struct acpi_subtable_header *header,
+                      const unsigned long end)
+{
+        struct acpi_madt_local_x2apic_nmi *x2apic_nmi = NULL;
+
+        x2apic_nmi = (struct acpi_madt_local_x2apic_nmi *)header;
+
+        if (BAD_MADT_ENTRY(x2apic_nmi, end))
+                return -EINVAL;
+
+        acpi_table_print_madt_entry(header);
+
+        if (x2apic_nmi->lint != 1)
+                printk(KERN_WARNING PREFIX "NMI not connected to LINT 1!\n");
+
+        return 0;
+}
+
+static int __init
 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 {
         struct acpi_madt_local_apic_nmi *lapic_nmi = NULL;
@@ -823,6 +871,7 @@ static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
 static int __init acpi_parse_madt_lapic_entries(void)
 {
         int count;
+        int x2count = 0;
 
         if (!cpu_has_apic)
                 return -ENODEV;
@@ -846,22 +895,28 @@ static int __init acpi_parse_madt_lapic_entries(void)
         count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
                                       acpi_parse_sapic, MAX_APICS);
 
-        if (!count)
+        if (!count) {
+                x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC,
+                                                acpi_parse_x2apic, MAX_APICS);
                 count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
                                               acpi_parse_lapic, MAX_APICS);
-        if (!count) {
+        }
+        if (!count && !x2count) {
                 printk(KERN_ERR PREFIX "No LAPIC entries present\n");
                 /* TBD: Cleanup to allow fallback to MPS */
                 return -ENODEV;
-        } else if (count < 0) {
+        } else if (count < 0 || x2count < 0) {
                 printk(KERN_ERR PREFIX "Error parsing LAPIC entry\n");
                 /* TBD: Cleanup to allow fallback to MPS */
                 return count;
         }
 
+        x2count =
+            acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC_NMI,
+                                  acpi_parse_x2apic_nmi, 0);
         count =
             acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0);
-        if (count < 0) {
+        if (count < 0 || x2count < 0) {
                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
                 /* TBD: Cleanup to allow fallback to MPS */
                 return count;
diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
index 09737c8af07..13d56f5b134 100644
--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -115,6 +115,36 @@ void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
         reserve_early(phys, phys + length, "ACPI SLIT");
 }
 
+/* Callback for Proximity Domain -> x2APIC mapping */
+void __init
+acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
+{
+        int pxm, node;
+        int apic_id;
+
+        if (srat_disabled())
+                return;
+        if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
+                bad_srat();
+                return;
+        }
+        if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
+                return;
+        pxm = pa->proximity_domain;
+        node = setup_node(pxm);
+        if (node < 0) {
+                printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
+                bad_srat();
+                return;
+        }
+
+        apic_id = pa->apic_id;
+        apicid_to_node[apic_id] = node;
+        acpi_numa = 1;
+        printk(KERN_INFO "SRAT: PXM %u -> APIC %u -> Node %u\n",
+               pxm, apic_id, node);
+}
+
 /* Callback for Proximity Domain -> LAPIC mapping */
 void __init
 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
index 3a0d8ef25c7..d440ccd27d9 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 0cc2fd31e37..775324e34ff 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 a8852952fac..991c006a301 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 =
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 6fce2fc2d12..a6989e51754 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -96,6 +96,7 @@ void acpi_table_print_madt_entry (struct acpi_subtable_header *madt);
 /* the following four functions are architecture-dependent */
 void acpi_numa_slit_init (struct acpi_table_slit *slit);
 void acpi_numa_processor_affinity_init (struct acpi_srat_cpu_affinity *pa);
+void acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa);
 void acpi_numa_memory_affinity_init (struct acpi_srat_mem_affinity *ma);
 void acpi_numa_arch_fixup(void);