[PATCH v3 05/12] arm64, acpi, numa: NUMA support based on SRAT and SLIT

Matthias Brugger
2016-03-02T14:08:42Z

On 23/01/16 10:39, Hanjun Guo wrote:
> 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>
> ---
> arch/arm64/include/asm/acpi.h | 8 ++
> arch/arm64/include/asm/numa.h | 3 +
> arch/arm64/kernel/Makefile | 1 +
> arch/arm64/kernel/acpi_numa.c | 235 ++++++++++++++++++++++++++++++++++++++++++
> arch/arm64/kernel/smp.c | 3 +
> arch/arm64/mm/numa.c | 5 +-
> 6 files changed, 252 insertions(+), 3 deletions(-)
> 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 caafd63..6db9c6f 100644
> --- a/arch/arm64/include/asm/acpi.h
> +++ b/arch/arm64/include/asm/acpi.h
> @@ -96,4 +96,12 @@ 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);
> +void acpi_numa_set_node_info(unsigned int cpu, u64 hwid);
> +#else
> +static inline int arm64_acpi_numa_init(void) { return -ENODEV; }
> +static inline void acpi_numa_set_node_info(unsigned int cpu, u64 hwid) { }
> +#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 54deb38..1beb194 100644
> --- a/arch/arm64/include/asm/numa.h
> +++ b/arch/arm64/include/asm/numa.h
> @@ -6,6 +6,8 @@
>
> #ifdef CONFIG_NUMA
>
> +#define NR_NODE_MEMBLKS (MAX_NUMNODES * 2)
> +
> /* currently, arm64 implements flat NUMA topology */
> #define parent_node(node) (node)
>
> @@ -43,6 +45,7 @@ struct device_node;
> int __init arm64_of_numa_init(void);
> void __init of_numa_set_node_info(unsigned int cpu, struct device_node *dn);
> #else
> +static inline int arm64_of_numa_init(void) { return -ENODEV; }
> static inline void of_numa_set_node_info(unsigned int cpu,
> struct device_node *dn) { }
> #endif
> diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
> index 7987763..555c4a5 100644
> --- a/arch/arm64/kernel/Makefile
> +++ b/arch/arm64/kernel/Makefile
> @@ -42,6 +42,7 @@ arm64-obj-$(CONFIG_PCI) += pci.o
> arm64-obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o
> arm64-obj-$(CONFIG_ACPI) += acpi.o
> arm64-obj-$(CONFIG_OF_NUMA) += of_numa.o
> +arm64-obj-$(CONFIG_ACPI_NUMA) += acpi_numa.o
>
> obj-y += $(arm64-obj-y) vdso/
> obj-m += $(arm64-obj-m)
> diff --git a/arch/arm64/kernel/acpi_numa.c b/arch/arm64/kernel/acpi_numa.c
> new file mode 100644
> index 0000000..f7f7533
> --- /dev/null
> +++ b/arch/arm64/kernel/acpi_numa.c
> @@ -0,0 +1,235 @@
> +/*
> + * 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>
> +
> +int acpi_numa __initdata;
> +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} };
> +
> +static __init void bad_srat(void)
> +{
> + pr_err("SRAT not used.\n");
> + acpi_numa = -1;
> +}
> +
> +static __init inline int srat_disabled(void)
> +{
> + return acpi_numa < 0;
> +}
> +
> +void __init acpi_numa_set_node_info(unsigned int cpu, u64 hwid)
> +{
> + int nid = 0, i;
> +
> + for (i = 0; i < cpus_in_srat; i++) {
> + if (hwid == early_node_cpu_hwid[i].cpu_hwid) {
> + nid = early_node_cpu_hwid[i].node_id;
> + break;
> + }
> + }
> +
> + cpu_to_node_map[cpu] = nid;
> +}
> +
> +/*
> + * Callback for SLIT parsing.
> + * It will get the distance information presented by SLIT
> + * and init the distance matrix of numa nodes
> + */
> +void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
> +{
> + int i, j;
> +
> + for (i = 0; i < slit->locality_count; i++) {
> + const int from_node = pxm_to_node(i);
> +
> + if (from_node == NUMA_NO_NODE)
> + continue;
> +
> + for (j = 0; j < slit->locality_count; j++) {
> + const int to_node = pxm_to_node(j);
> +
> + if (to_node == NUMA_NO_NODE)
> + continue;
> +
> + pr_debug("SLIT: Distance[%d][%d] = %d\n",
> + from_node, to_node,
> + slit->entry[
> + slit->locality_count * i + j]);
> + numa_set_distance(from_node, to_node,
> + slit->entry[slit->locality_count * i + j]);
> + }
> + }
> +}
> +
> +static int __init get_mpidr_in_madt(int acpi_id, u64 *mpidr)
> +{
> + unsigned long madt_end, entry;
> + struct acpi_table_madt *madt;
> + acpi_size tbl_size;
> +
> + if (ACPI_FAILURE(acpi_get_table_with_size(ACPI_SIG_MADT, 0,
> + (struct acpi_table_header **)&madt, &tbl_size)))
> + return -ENODEV;
> +
> + entry = (unsigned long)madt;
> + madt_end = entry + madt->header.length;
> +
> + /* Parse all entries looking for a match. */
> + entry += sizeof(struct acpi_table_madt);
> + while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
> + struct acpi_subtable_header *header =
> + (struct acpi_subtable_header *)entry;
> +
> + if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
> + struct acpi_madt_generic_interrupt *gicc =
> + container_of(header,
> + struct acpi_madt_generic_interrupt, header);
> +
> + if ((gicc->flags & ACPI_MADT_ENABLED) &&
> + (gicc->uid == acpi_id)) {
> + *mpidr = gicc->arm_mpidr;
> + early_acpi_os_unmap_memory(madt, tbl_size);
> + return 0;
> + }
> + }
> + entry += header->length;
> + }
> +
> + early_acpi_os_unmap_memory(madt, tbl_size);
> + return -ENODEV;
> +}
> +
> +/* Callback for Proximity Domain -> ACPI processor UID mapping */
> +void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa)
> +{
> + int pxm, node;
> + u64 mpidr;
> +
> + if (srat_disabled())
> + return;
> +
> + if (pa->header.length < sizeof(struct acpi_srat_gicc_affinity)) {
> + 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;
> + }
> +
> + if (get_mpidr_in_madt(pa->acpi_processor_uid, &mpidr)) {
> + pr_warn("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);
> + acpi_numa = 1;
> + cpus_in_srat++;
> + pr_info("SRAT: PXM %d -> MPIDR 0x%Lx -> Node %d cpu %d\n",
> + pxm, mpidr, node, cpus_in_srat);
> +}
> +
> +/* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
> +int __init acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
> +{
> + u64 start, end;
> + int node, pxm;
> +
> + if (srat_disabled())
> + return -EINVAL;
> +
> + if (ma->header.length != sizeof(struct acpi_srat_mem_affinity)) {
> + bad_srat();
> + return -EINVAL;
> + }
> +
> + /* Ignore disabled entries */
> + if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
> + return -EINVAL;
> +
> + start = ma->base_address;
> + end = start + ma->length;
> + pxm = ma->proximity_domain;
> +
> + node = acpi_map_pxm_to_node(pxm);
> +
> + if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
> + pr_err("SRAT: Too many proximity domains.\n");
> + bad_srat();
> + return -EINVAL;
> + }
> +
> + pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]\n",
> + node, pxm,
> + (unsigned long long) start, (unsigned long long) end - 1);
> +
> + if (numa_add_memblk(node, start, (end - start)) < 0) {
> + bad_srat();
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +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 a2a8c2d..112a892 100644
> --- a/arch/arm64/kernel/smp.c
> +++ b/arch/arm64/kernel/smp.c
> @@ -447,6 +447,9 @@ acpi_map_gic_cpu_interface(struct acpi_madt_generic_interrupt *processor)
> /* map the logical cpu id to cpu MPIDR */
> cpu_logical_map(cpu_count) = hwid;
>
> + /* map logical cpu to node */
> + acpi_numa_set_node_info(cpu_count, hwid);
> +
> cpu_count++;
> }
>
> diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
> index 9e8704b..e974995 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/ctype.h>
> #include <linux/init.h>
> @@ -385,10 +386,8 @@ void __init arm64_numa_init(void)
> {
> int ret = -ENODEV;
>
> -#ifdef CONFIG_OF_NUMA
> if (!numa_off)
> - ret = numa_init(arm64_of_numa_init);
> -#endif
> + ret = numa_init(acpi_disabled ? arm64_of_numa_init : arm64_acpi_numa_init);

Header asm/acpi.h is included in linux/acpi.h but only if CONFIG_ACPI=y
arm64_acpi_numa_init is declared in asm/acpi.h, so if we don't use the
ifdef CONFIG_* approach from Robert, we will need to include as/acpi.h
implicitly here. Otherwise we get a compilation error if CONFIG_ACPI is
not set.

Regards,
Matthias