[PATCH v7 5/5] x86, acpi, cpu-hotplug: Set persistent cpuid <-> nodeid mapping when booting.
From: Zhu Guihua
Date: Thu May 19 2016 - 06:41:30 EST
From: Gu Zheng <guz.fnst@xxxxxxxxxxxxxx>
The whole patch-set aims at making cpuid <-> nodeid mapping persistent. So that,
when node online/offline happens, cache based on cpuid <-> nodeid mapping such as
wq_numa_possible_cpumask will not cause any problem.
It contains 4 steps:
1. Enable apic registeration flow to handle both enabled and disabled cpus.
2. Introduce a new array storing all possible cpuid <-> apicid mapping.
3. Enable _MAT and MADT relative apis to return non-presnet or disabled cpus' apicid.
4. Establish all possible cpuid <-> nodeid mapping.
This patch finishes step 4.
This patch set the persistent cpuid <-> nodeid mapping for all enabled/disabled
processors at boot time via an additional acpi namespace walk for processors.
Signed-off-by: Gu Zheng <guz.fnst@xxxxxxxxxxxxxx>
Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Signed-off-by: Zhu Guihua <zhugh.fnst@xxxxxxxxxxxxxx>
---
arch/ia64/kernel/acpi.c | 3 +-
arch/x86/kernel/acpi/boot.c | 4 ++-
drivers/acpi/acpi_processor.c | 5 ++++
drivers/acpi/bus.c | 3 ++
drivers/acpi/processor_core.c | 65 +++++++++++++++++++++++++++++++++++++++++++
include/linux/acpi.h | 2 ++
6 files changed, 80 insertions(+), 2 deletions(-)
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index b1698bc..bb36515 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -796,7 +796,7 @@ int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
* ACPI based hotplug CPU support
*/
#ifdef CONFIG_ACPI_HOTPLUG_CPU
-static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
+int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
{
#ifdef CONFIG_ACPI_NUMA
/*
@@ -811,6 +811,7 @@ static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
#endif
return 0;
}
+EXPORT_SYMBOL(acpi_map_cpu2node);
int additional_cpus __initdata = -1;
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 37248c3..0900264f 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -695,7 +695,7 @@ static void __init acpi_set_irq_model_ioapic(void)
#ifdef CONFIG_ACPI_HOTPLUG_CPU
#include <acpi/processor.h>
-static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
+int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
{
#ifdef CONFIG_ACPI_NUMA
int nid;
@@ -706,7 +706,9 @@ static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
numa_set_node(cpu, nid);
}
#endif
+ return 0;
}
+EXPORT_SYMBOL(acpi_map_cpu2node);
int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu)
{
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 9aa2dd1..b20f417 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -182,6 +182,11 @@ int __weak arch_register_cpu(int cpu)
void __weak arch_unregister_cpu(int cpu) {}
+int __weak acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
+{
+ return -ENODEV;
+}
+
static int acpi_processor_hotadd_init(struct acpi_processor *pr)
{
unsigned long long sta;
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 31e8da6..02f5721 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -1124,6 +1124,9 @@ static int __init acpi_init(void)
acpi_sleep_proc_init();
acpi_wakeup_device_init();
acpi_debugger_init();
+#ifdef CONFIG_ACPI_HOTPLUG_CPU
+ acpi_set_processor_mapping();
+#endif
return 0;
}
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 824b98b..69fb027 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -261,6 +261,71 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
}
EXPORT_SYMBOL_GPL(acpi_get_cpuid);
+#ifdef CONFIG_ACPI_HOTPLUG_CPU
+static bool map_processor(acpi_handle handle, phys_cpuid_t *phys_id, int *cpuid)
+{
+ int type;
+ u32 acpi_id;
+ acpi_status status;
+ acpi_object_type acpi_type;
+ unsigned long long tmp;
+ union acpi_object object = { 0 };
+ struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
+
+ status = acpi_get_type(handle, &acpi_type);
+ if (ACPI_FAILURE(status))
+ return false;
+
+ switch (acpi_type) {
+ case ACPI_TYPE_PROCESSOR:
+ status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
+ if (ACPI_FAILURE(status))
+ return false;
+ acpi_id = object.processor.proc_id;
+ break;
+ case ACPI_TYPE_DEVICE:
+ status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
+ if (ACPI_FAILURE(status))
+ return false;
+ acpi_id = tmp;
+ break;
+ default:
+ return false;
+ }
+
+ type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
+
+ *phys_id = __acpi_get_phys_id(handle, type, acpi_id, false);
+ *cpuid = acpi_map_cpuid(*phys_id, acpi_id);
+ if (*cpuid == -1)
+ return false;
+
+ return true;
+}
+
+static acpi_status __init
+set_processor_node_mapping(acpi_handle handle, u32 lvl, void *context,
+ void **rv)
+{
+ phys_cpuid_t phys_id;
+ int cpu_id;
+
+ if (!map_processor(handle, &phys_id, &cpu_id))
+ return AE_ERROR;
+
+ acpi_map_cpu2node(handle, cpu_id, phys_id);
+ return AE_OK;
+}
+
+void __init acpi_set_processor_mapping(void)
+{
+ /* Set persistent cpu <-> node mapping for all processors. */
+ acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
+ ACPI_UINT32_MAX, set_processor_node_mapping,
+ NULL, NULL, NULL);
+}
+#endif
+
#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
u64 *phys_addr, int *ioapic_id)
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 288fac5..53b3014 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -258,6 +258,8 @@ static inline bool invalid_phys_cpuid(phys_cpuid_t phys_id)
/* Arch dependent functions for cpu hotplug support */
int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu);
int acpi_unmap_cpu(int cpu);
+int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid);
+void __init acpi_set_processor_mapping(void);
#endif /* CONFIG_ACPI_HOTPLUG_CPU */
#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
--
1.9.3