[RFC PATCH v3 19/24] ARM: NUMA: Extract MPIDR from MADT table

[vijay.kilari@gmail.com]

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

Parse MADT table and extract MPIDR for all
CPU IDs in MADT ACPI_MADT_TYPE_GENERIC_INTERRUPT entries
and store in cpuid_to_hwid_map[]

This mapping is used by SRAT table parsing to extract MPIDR
of the CPU ID.

MADT table is also parsed in arm/acpi/boot.c during smp boot.
However cannot wait till smp boot as SRAT table is parsed
much before during numa_init. Hence MADT is parsed twice
during boot. Once in numa_init and another in smp init.

Signed-off-by: Vijaya Kumar <Vijaya.Kumar@cavium.com>
---
v3: - acpi_numa is set to -1 on numa failure.
---
 xen/arch/arm/numa/Makefile    |  1 +
 xen/arch/arm/numa/acpi_numa.c | 94 +++++++++++++++++++++++++++++++++++++++++++
 xen/arch/arm/numa/numa.c      |  6 +++
 3 files changed, 101 insertions(+)

diff --git a/xen/arch/arm/numa/Makefile b/xen/arch/arm/numa/Makefile
index 3af3aff..b549459 100644
--- a/xen/arch/arm/numa/Makefile
+++ b/xen/arch/arm/numa/Makefile
@@ -1,2 +1,3 @@
 obj-y += dt_numa.o
 obj-y += numa.o
+obj-$(CONFIG_ACPI_NUMA) += acpi_numa.o
diff --git a/xen/arch/arm/numa/acpi_numa.c b/xen/arch/arm/numa/acpi_numa.c
new file mode 100644
index 0000000..d9ad547
--- /dev/null
+++ b/xen/arch/arm/numa/acpi_numa.c
@@ -0,0 +1,94 @@
+/*
+ * ACPI based NUMA setup
+ *
+ * Copyright (C) 2016 - Cavium Inc.
+ * Vijaya Kumar K <Vijaya.Kumar@cavium.com>
+ *
+ * Reads the ACPI MADT and SRAT table to setup NUMA information.
+ * Contains Excerpts from x86 implementation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <xen/init.h>
+#include <xen/mm.h>
+#include <xen/inttypes.h>
+#include <xen/nodemask.h>
+#include <xen/acpi.h>
+#include <xen/numa.h>
+#include <xen/pfn.h>
+#include <xen/acpi.h>
+#include <acpi/srat.h>
+#include <asm/page.h>
+
+/* Holds CPUID to MPIDR mapping read from MADT table. */
+struct cpuid_to_hwid {
+    uint32_t cpuid;
+    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 unsigned int num_cpuid_to_hwid;
+
+static void __init acpi_map_cpu_to_hwid(uint32_t cpuid, uint64_t mpidr)
+{
+    if ( mpidr == MPIDR_INVALID )
+    {
+        printk("Skip MADT cpu entry with invalid MPIDR\n");
+        numa_failed();
+        return;
+    }
+
+    cpuid_to_hwid_map[num_cpuid_to_hwid].hwid = mpidr;
+    cpuid_to_hwid_map[num_cpuid_to_hwid].cpuid = cpuid;
+    num_cpuid_to_hwid++;
+}
+
+static int __init acpi_parse_madt_handler(struct acpi_subtable_header *header,
+                                          const unsigned long end)
+{
+    uint64_t mpidr;
+    struct acpi_madt_generic_interrupt *p =
+               container_of(header, struct acpi_madt_generic_interrupt, header);
+
+    if ( BAD_MADT_ENTRY(p, end) )
+    {
+        /* MADT is invalid, we disable NUMA by calling numa_failed() */
+        numa_failed();
+        return -EINVAL;
+    }
+
+    acpi_table_print_madt_entry(header);
+    mpidr = p->arm_mpidr & MPIDR_HWID_MASK;
+    acpi_map_cpu_to_hwid(p->uid, mpidr);
+
+    return 0;
+}
+
+void __init acpi_map_uid_to_mpidr(void)
+{
+    acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
+                    acpi_parse_madt_handler, NR_CPUS);
+}
+
+void __init acpi_numa_arch_fixup(void) {}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/numa/numa.c b/xen/arch/arm/numa/numa.c
index 85352dc..26aa4c0 100644
--- a/xen/arch/arm/numa/numa.c
+++ b/xen/arch/arm/numa/numa.c
@@ -19,6 +19,7 @@
 #include <xen/nodemask.h>
 #include <xen/numa.h>
 #include <xen/pfn.h>
+#include <acpi/srat.h>
 #include <asm/acpi.h>
 
 static uint8_t (*node_distance_fn)(nodeid_t a, nodeid_t b);
@@ -40,6 +41,11 @@ void numa_failed(void)
     init_dt_numa_distance();
     node_distance_fn = NULL;
     init_cpu_to_node();
+
+#ifdef CONFIG_ACPI_NUMA
+    acpi_numa = -1;
+    reset_pxm2node();
+#endif
 }
 
 void __init numa_set_cpu_node(int cpu, unsigned int nid)
-- 
2.7.4


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