[RFC PATCH v3 21/24] ARM: NUMA: ACPI: Extract proximity from SRAT table

[vijay.kilari@gmail.com]

From: Vijaya Kumar K <Vijaya.Kumar@cavium.com>

Register SRAT entry handler for type
ACPI_SRAT_TYPE_GICC_AFFINITY to parse SRAT table
and extract proximity for all CPU IDs.

Signed-off-by: Vijaya Kumar <Vijaya.Kumar@cavium.com>
---
 xen/arch/arm/acpi/boot.c      |   2 +
 xen/arch/arm/numa/acpi_numa.c | 124 +++++++++++++++++++++++++++++++++++++++++-
 xen/drivers/acpi/numa.c       |  15 +++++
 xen/include/acpi/actbl1.h     |  17 +++++-
 xen/include/asm-arm/numa.h    |   9 +++
 5 files changed, 165 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/acpi/boot.c b/xen/arch/arm/acpi/boot.c
index 889208a..4e28b16 100644
--- a/xen/arch/arm/acpi/boot.c
+++ b/xen/arch/arm/acpi/boot.c
@@ -31,6 +31,7 @@
 #include <acpi/actables.h>
 #include <xen/mm.h>
 #include <xen/device_tree.h>
+#include <xen/numa.h>
 
 #include <asm/acpi.h>
 #include <asm/smp.h>
@@ -117,6 +118,7 @@ acpi_map_gic_cpu_interface(struct acpi_madt_generic_interrupt *processor)
         return;
     }
 
+    numa_set_cpu_node(enabled_cpus, acpi_get_nodeid(mpidr));
     /* map the logical cpu id to cpu MPIDR */
     cpu_logical_map(enabled_cpus) = mpidr;
 
diff --git a/xen/arch/arm/numa/acpi_numa.c b/xen/arch/arm/numa/acpi_numa.c
index 341e20b7..95617f9 100644
--- a/xen/arch/arm/numa/acpi_numa.c
+++ b/xen/arch/arm/numa/acpi_numa.c
@@ -34,13 +34,63 @@ struct cpuid_to_hwid {
     uint64_t hwid;
 };
 
+/* Holds NODE to MPIDR mapping. */
+struct node_to_hwid {
+    nodeid_t nodeid;
+    uint64_t hwid;
+};
+
 #define PHYS_CPUID_INVALID 0xff
 
 /* Holds mapping of CPU id to MPIDR read from MADT */
 static struct cpuid_to_hwid __read_mostly cpuid_to_hwid_map[NR_CPUS] =
     { [0 ... NR_CPUS - 1] = {PHYS_CPUID_INVALID, MPIDR_INVALID} };
+static struct node_to_hwid __read_mostly node_to_hwid_map[NR_CPUS] =
+    { [0 ... NR_CPUS - 1] = {NUMA_NO_NODE, MPIDR_INVALID} };
+static unsigned int cpus_in_srat;
 static unsigned int num_cpuid_to_hwid;
 
+nodeid_t __init acpi_get_nodeid(uint64_t hwid)
+{
+    unsigned int i;
+
+    for ( i = 0; i < cpus_in_srat; i++ )
+    {
+        if ( node_to_hwid_map[i].hwid == hwid )
+            return node_to_hwid_map[i].nodeid;
+    }
+
+    return NUMA_NO_NODE;
+}
+
+static uint64_t acpi_get_cpu_hwid(int cid)
+{
+    unsigned int i;
+
+    for ( i = 0; i < num_cpuid_to_hwid; i++ )
+    {
+        if ( cpuid_to_hwid_map[i].cpuid == cid )
+            return cpuid_to_hwid_map[i].hwid;
+    }
+
+    return MPIDR_INVALID;
+}
+
+static void __init acpi_map_node_to_hwid(nodeid_t nodeid, uint64_t hwid)
+{
+    if ( nodeid >= MAX_NUMNODES )
+    {
+        printk(XENLOG_WARNING
+               "ACPI: NUMA: nodeid out of range %d with MPIDR 0x%lx\n",
+               nodeid, hwid);
+        numa_failed();
+        return;
+    }
+
+    node_to_hwid_map[cpus_in_srat].nodeid = nodeid;
+    node_to_hwid_map[cpus_in_srat].hwid = hwid;
+}
+
 static void __init acpi_map_cpu_to_hwid(uint32_t cpuid, uint64_t mpidr)
 {
     if ( mpidr == MPIDR_INVALID )
@@ -76,15 +126,87 @@ static int __init acpi_parse_madt_handler(struct acpi_subtable_header *header,
     return 0;
 }
 
+/* Callback for Proximity Domain -> ACPI processor UID mapping */
+static void __init
+acpi_numa_gicc_affinity_init(const struct acpi_srat_gicc_affinity *pa)
+{
+    int pxm, node;
+    uint64_t mpidr;
+
+    if ( srat_disabled() )
+        return;
+
+    if ( pa->header.length < sizeof(struct acpi_srat_gicc_affinity) )
+    {
+        printk(XENLOG_WARNING "SRAT: Invalid SRAT header length: %d\n",
+               pa->header.length);
+        numa_failed();
+        return;
+    }
+
+    if ( !(pa->flags & ACPI_SRAT_GICC_ENABLED) )
+        return;
+
+    if ( cpus_in_srat >= NR_CPUS )
+    {
+        printk(XENLOG_ERR
+               "SRAT: cpu_to_node_map[%d] is too small to fit all cpus\n",
+               NR_CPUS);
+        return;
+    }
+
+    pxm = pa->proximity_domain;
+    node = acpi_setup_node(pxm);
+    if ( node == NUMA_NO_NODE )
+    {
+        numa_failed();
+        return;
+    }
+
+    mpidr = acpi_get_cpu_hwid(pa->acpi_processor_uid);
+    if ( mpidr == MPIDR_INVALID )
+    {
+        printk(XENLOG_ERR
+               "SRAT: PXM %d with ACPI ID %d has no valid MPIDR in MADT\n",
+               pxm, pa->acpi_processor_uid);
+        numa_failed();
+        return;
+    }
+
+    acpi_map_node_to_hwid(node, mpidr);
+    node_set(node, processor_nodes_parsed);
+    cpus_in_srat++;
+    acpi_numa = 1;
+    printk(XENLOG_INFO "SRAT: PXM %d -> MPIDR 0x%lx -> Node %d\n",
+           pxm, mpidr, node);
+}
+
 void __init acpi_map_uid_to_mpidr(void)
 {
     acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
                     acpi_parse_madt_handler, NR_CPUS);
 }
 
+static int __init
+acpi_parse_gicc_affinity(struct acpi_subtable_header *header,
+                         const unsigned long end)
+{
+   const struct acpi_srat_gicc_affinity *processor_affinity
+                = (struct acpi_srat_gicc_affinity *)header;
+
+   if (!processor_affinity)
+       return -EINVAL;
+
+   acpi_table_print_srat_entry(header);
+   acpi_numa_gicc_affinity_init(processor_affinity);
+
+   return 0;
+}
+
 void __init arch_table_parse_srat(void)
 {
-    return;
+    acpi_table_parse_srat(ACPI_SRAT_TYPE_GICC_AFFINITY,
+                          acpi_parse_gicc_affinity, NR_CPUS);
 }
 
 void __init acpi_numa_arch_fixup(void) {}
diff --git a/xen/drivers/acpi/numa.c b/xen/drivers/acpi/numa.c
index 0adc32c..b48d91d 100644
--- a/xen/drivers/acpi/numa.c
+++ b/xen/drivers/acpi/numa.c
@@ -104,6 +104,21 @@ void __init acpi_table_print_srat_entry(struct acpi_subtable_header * header)
 		}
 #endif				/* ACPI_DEBUG_OUTPUT */
 		break;
+       case ACPI_SRAT_TYPE_GICC_AFFINITY:
+#ifdef ACPI_DEBUG_OUTPUT
+		{
+			struct acpi_srat_gicc_affinity *p =
+			    (struct acpi_srat_gicc_affinity *)header;
+			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+					  "SRAT Processor (acpi id[0x%04x]) in"
+					  " proximity domain %d %s\n",
+					  p->acpi_processor_uid,
+					  p->proximity_domain,
+					  (p->flags & ACPI_SRAT_GICC_ENABLED) ?
+					  "enabled" : "disabled");
+		}
+#endif                         /* ACPI_DEBUG_OUTPUT */
+               break;
 	default:
 		printk(KERN_WARNING PREFIX
 		       "Found unsupported SRAT entry (type = %#x)\n",
diff --git a/xen/include/acpi/actbl1.h b/xen/include/acpi/actbl1.h
index e199136..b84bfba 100644
--- a/xen/include/acpi/actbl1.h
+++ b/xen/include/acpi/actbl1.h
@@ -949,7 +949,8 @@ enum acpi_srat_type {
 	ACPI_SRAT_TYPE_CPU_AFFINITY = 0,
 	ACPI_SRAT_TYPE_MEMORY_AFFINITY = 1,
 	ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY = 2,
-	ACPI_SRAT_TYPE_RESERVED = 3	/* 3 and greater are reserved */
+	ACPI_SRAT_TYPE_GICC_AFFINITY = 3,
+	ACPI_SRAT_TYPE_RESERVED = 4	/* 4 and greater are reserved */
 };
 
 /*
@@ -1007,6 +1008,20 @@ struct acpi_srat_x2apic_cpu_affinity {
 
 #define ACPI_SRAT_CPU_ENABLED       (1)	/* 00: Use affinity structure */
 
+/* 3: GICC Affinity (ACPI 5.1) */
+
+struct acpi_srat_gicc_affinity {
+	struct acpi_subtable_header header;
+	u32 proximity_domain;
+	u32 acpi_processor_uid;
+	u32 flags;
+	u32 clock_domain;
+};
+
+/* Flags for struct acpi_srat_gicc_affinity */
+
+#define ACPI_SRAT_GICC_ENABLED     (1)  /* 00: Use affinity structure */
+
 /* Reset to default packing */
 
 #pragma pack()
diff --git a/xen/include/asm-arm/numa.h b/xen/include/asm-arm/numa.h
index 0d3146c..f0a50bd 100644
--- a/xen/include/asm-arm/numa.h
+++ b/xen/include/asm-arm/numa.h
@@ -7,6 +7,15 @@ void dt_numa_process_memory_node(uint32_t nid, paddr_t start, paddr_t size);
 void register_node_distance(uint8_t (fn)(nodeid_t a, nodeid_t b));
 void init_dt_numa_distance(void);
 
+#ifdef CONFIG_ACPI_NUMA
+nodeid_t acpi_get_nodeid(uint64_t hwid);
+#else
+static inline nodeid_t acpi_get_nodeid(uint64_t hwid)
+{
+    return 0;
+}
+#endif /* CONFIG_ACPI_NUMA */
+
 #ifdef CONFIG_NUMA
 void numa_init(void);
 int dt_numa_init(void);
-- 
2.7.4


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