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[PATCH v7 14/15] arm64, acpi, numa: NUMA support based on SRAT and SLIT

From David Daney <ddaney.cavm@gmail.com>
Newsgroups linux.kernel
Subject [PATCH v7 14/15] arm64, acpi, numa: NUMA support based on SRAT and SLIT
Date 2016-05-25 00:40 +0200
Message-ID <rCt9w-R2-27@gated-at.bofh.it> (permalink)
References <rCt9v-R2-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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From: Hanjun Guo <hanjun.guo@linaro.org>

Introduce a new file to hold ACPI based NUMA information parsing from
SRAT and SLIT.

SRAT includes the CPU ACPI ID to Proximity Domain mappings and memory
ranges to Proximity Domain mapping.  SLIT has the information of inter
node distances(relative number for access latency).

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Ganapatrao Kulkarni <gkulkarni@caviumnetworks.com>
[rrichter@cavium.com Reworked for numa v10 series ]
Signed-off-by: Robert Richter <rrichter@cavium.com>
[david.daney@cavium.com reorderd and combinded with other patches in
Hanjun Guo's original set, removed get_mpidr_in_madt() and use
acpi_map_madt_entry() instead.]
Signed-off-by: David Daney <david.daney@cavium.com>
---
 arch/arm64/include/asm/acpi.h |   8 +++
 arch/arm64/include/asm/numa.h |   2 +
 arch/arm64/kernel/Makefile    |   1 +
 arch/arm64/kernel/acpi_numa.c | 112 ++++++++++++++++++++++++++++++++++++++++++
 arch/arm64/kernel/smp.c       |   2 +
 arch/arm64/mm/numa.c          |   5 +-
 6 files changed, 129 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/kernel/acpi_numa.c

diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index aee323b..4b13ecd 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -113,4 +113,12 @@ static inline const char *acpi_get_enable_method(int cpu)
 pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr);
 #endif
 
+#ifdef CONFIG_ACPI_NUMA
+int arm64_acpi_numa_init(void);
+int acpi_numa_get_nid(unsigned int cpu, u64 hwid);
+#else
+static inline int arm64_acpi_numa_init(void) { return -ENOSYS; }
+static inline int acpi_numa_get_nid(unsigned int cpu, u64 hwid) { return NUMA_NO_NODE; }
+#endif /* CONFIG_ACPI_NUMA */
+
 #endif /*_ASM_ACPI_H*/
diff --git a/arch/arm64/include/asm/numa.h b/arch/arm64/include/asm/numa.h
index e9b4f29..600887e 100644
--- a/arch/arm64/include/asm/numa.h
+++ b/arch/arm64/include/asm/numa.h
@@ -5,6 +5,8 @@
 
 #ifdef CONFIG_NUMA
 
+#define NR_NODE_MEMBLKS		(MAX_NUMNODES * 2)
+
 /* currently, arm64 implements flat NUMA topology */
 #define parent_node(node)	(node)
 
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 2173149..a5125c6 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -42,6 +42,7 @@ arm64-obj-$(CONFIG_EFI)			+= efi.o efi-entry.stub.o
 arm64-obj-$(CONFIG_PCI)			+= pci.o
 arm64-obj-$(CONFIG_ARMV8_DEPRECATED)	+= armv8_deprecated.o
 arm64-obj-$(CONFIG_ACPI)		+= acpi.o
+arm64-obj-$(CONFIG_ACPI_NUMA)		+= acpi_numa.o
 arm64-obj-$(CONFIG_ARM64_ACPI_PARKING_PROTOCOL)	+= acpi_parking_protocol.o
 arm64-obj-$(CONFIG_PARAVIRT)		+= paravirt.o
 arm64-obj-$(CONFIG_RANDOMIZE_BASE)	+= kaslr.o
diff --git a/arch/arm64/kernel/acpi_numa.c b/arch/arm64/kernel/acpi_numa.c
new file mode 100644
index 0000000..f85149c
--- /dev/null
+++ b/arch/arm64/kernel/acpi_numa.c
@@ -0,0 +1,112 @@
+/*
+ * ACPI 5.1 based NUMA setup for ARM64
+ * Lots of code was borrowed from arch/x86/mm/srat.c
+ *
+ * Copyright 2004 Andi Kleen, SuSE Labs.
+ * Copyright (C) 2013-2016, Linaro Ltd.
+ *		Author: Hanjun Guo <hanjun.guo@linaro.org>
+ *
+ * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
+ *
+ * Called from acpi_numa_init while reading the SRAT and SLIT tables.
+ * Assumes all memory regions belonging to a single proximity domain
+ * are in one chunk. Holes between them will be included in the node.
+ */
+
+#define pr_fmt(fmt) "ACPI: NUMA: " fmt
+
+#include <linux/acpi.h>
+#include <linux/bitmap.h>
+#include <linux/bootmem.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/memblock.h>
+#include <linux/mmzone.h>
+#include <linux/module.h>
+#include <linux/topology.h>
+
+#include <acpi/processor.h>
+#include <asm/numa.h>
+
+static int cpus_in_srat;
+
+struct __node_cpu_hwid {
+	u32 node_id;    /* logical node containing this CPU */
+	u64 cpu_hwid;   /* MPIDR for this CPU */
+};
+
+static struct __node_cpu_hwid early_node_cpu_hwid[NR_CPUS] = {
+[0 ... NR_CPUS - 1] = {NUMA_NO_NODE, PHYS_CPUID_INVALID} };
+
+int acpi_numa_get_nid(unsigned int cpu, u64 hwid)
+{
+	int i;
+
+	for (i = 0; i < cpus_in_srat; i++) {
+		if (hwid == early_node_cpu_hwid[i].cpu_hwid)
+			return early_node_cpu_hwid[i].node_id;
+	}
+
+	return NUMA_NO_NODE;
+}
+
+/* Callback for Proximity Domain -> ACPI processor UID mapping */
+void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa)
+{
+	int pxm, node;
+	phys_cpuid_t mpidr;
+
+	if (srat_disabled())
+		return;
+
+	if (pa->header.length < sizeof(struct acpi_srat_gicc_affinity)) {
+		pr_err("SRAT: Invalid SRAT header length: %d\n",
+			pa->header.length);
+		bad_srat();
+		return;
+	}
+
+	if (!(pa->flags & ACPI_SRAT_GICC_ENABLED))
+		return;
+
+	if (cpus_in_srat >= NR_CPUS) {
+		pr_warn_once("SRAT: cpu_to_node_map[%d] is too small, may not be able to use all cpus\n",
+			     NR_CPUS);
+		return;
+	}
+
+	pxm = pa->proximity_domain;
+	node = acpi_map_pxm_to_node(pxm);
+
+	if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
+		pr_err("SRAT: Too many proximity domains %d\n", pxm);
+		bad_srat();
+		return;
+	}
+
+	mpidr = acpi_map_madt_entry(pa->acpi_processor_uid);
+	if (mpidr == PHYS_CPUID_INVALID) {
+		pr_err("SRAT: PXM %d with ACPI ID %d has no valid MPIDR in MADT\n",
+			pxm, pa->acpi_processor_uid);
+		bad_srat();
+		return;
+	}
+
+	early_node_cpu_hwid[cpus_in_srat].node_id = node;
+	early_node_cpu_hwid[cpus_in_srat].cpu_hwid =  mpidr;
+	node_set(node, numa_nodes_parsed);
+	cpus_in_srat++;
+	pr_info("SRAT: PXM %d -> MPIDR 0x%Lx -> Node %d\n",
+		pxm, mpidr, node);
+}
+
+int __init arm64_acpi_numa_init(void)
+{
+	int ret;
+
+	ret = acpi_numa_init();
+	if (ret)
+		return ret;
+
+	return srat_disabled() ? -EINVAL : 0;
+}
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 678e084..d099306 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -560,6 +560,8 @@ acpi_map_gic_cpu_interface(struct acpi_madt_generic_interrupt *processor)
 	 */
 	acpi_set_mailbox_entry(cpu_count, processor);
 
+	early_map_cpu_to_node(cpu_count, acpi_numa_get_nid(cpu_count, hwid));
+
 	cpu_count++;
 }
 
diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
index 1def1de..c7fe3ec 100644
--- a/arch/arm64/mm/numa.c
+++ b/arch/arm64/mm/numa.c
@@ -17,6 +17,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/acpi.h>
 #include <linux/bootmem.h>
 #include <linux/memblock.h>
 #include <linux/module.h>
@@ -391,7 +392,9 @@ static int __init dummy_numa_init(void)
 void __init arm64_numa_init(void)
 {
 	if (!numa_off) {
-		if (!numa_init(of_numa_init))
+		if (!acpi_disabled && !numa_init(arm64_acpi_numa_init))
+			return;
+		if (acpi_disabled && !numa_init(of_numa_init))
 			return;
 	}
 
-- 
1.7.11.7

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Thread

[PATCH v7 00/15] ACPI NUMA support for ARM64 David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:40 +0200
  [PATCH v7 02/15] acpi, numa: Replace ACPI_DEBUG_PRINT() with pr_debug() David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:40 +0200
  [PATCH v7 09/15] acpi, numa: move bad_srat() and srat_disabled() to drivers/acpi/numa.c David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:40 +0200
  [PATCH v7 12/15] acpi, numa, srat: Improve SRAT error detection and add messages. David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:40 +0200
  [PATCH v7 13/15] ACPI / processor: Add acpi_map_madt_entry(). David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:40 +0200
    Re: [PATCH v7 13/15] ACPI / processor: Add acpi_map_madt_entry(). Catalin Marinas <catalin.marinas@arm.com> - 2016-05-25 16:50 +0200
  [PATCH v7 11/15] acpi, numa: Move acpi_numa_memory_affinity_init() to drivers/acpi/numa.c David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:40 +0200
  [PATCH v7 10/15] acpi, numa: remove unneeded acpi_numa=1 David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:40 +0200
  [PATCH v7 14/15] arm64, acpi, numa: NUMA support based on SRAT and SLIT David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:40 +0200
    Re: [PATCH v7 14/15] arm64, acpi, numa: NUMA support based on SRAT  and SLIT Catalin Marinas <catalin.marinas@arm.com> - 2016-05-25 16:50 +0200
    Re: [PATCH v7 14/15] arm64, acpi, numa: NUMA support based on SRAT  and SLIT Dennis Chen <dennis.chen@linaro.org> - 2016-05-27 10:10 +0200
  [PATCH v7 15/15] acpi, numa: Enable ACPI based NUMA on ARM64 David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:40 +0200
  [PATCH v7 05/15] acpi, numa: move acpi_numa_slit_init() to drivers/acpi/numa.c David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:40 +0200
  [PATCH v7 07/15] arm64, numa: Cleanup NUMA disabled messages. David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:40 +0200
    Re: [PATCH v7 07/15] arm64, numa: Cleanup NUMA disabled messages. Dennis Chen <dennis.chen@linaro.org> - 2016-05-27 10:00 +0200
  [PATCH v7 08/15] x86, acpi, numa: cleanup acpi_numa_processor_affinity_init() David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:40 +0200
  [PATCH v7 06/15] arm64, numa: rework numa_add_memblk() David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:50 +0200
  [PATCH v7 04/15] acpi, numa: Move acpi_numa_arch_fixup() to ia64 only David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:50 +0200
  [PATCH v7 03/15] acpi, numa: remove duplicate NULL check David Daney <ddaney.cavm@gmail.com> - 2016-05-25 00:50 +0200

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