[PATCH 2/2] ia64: Provide ACPI fixup for /proc/cpuinfo/physical_id

Alex Chiang
2008-04-24T18:52:22Z

Legacy HP ia64 platforms currently cannot provide
/proc/cpuinfo/physical_id due to legacy SAL/PAL implementations.
However, that physical topology information can be obtained
via ACPI.

Provide an interface that gives ACPI one last chance to provide
physical_id for these legacy platforms. This logic only comes
into play iff:

- ACPI actually provides slot information for the CPU
- we lack a valid socket_id

Otherwise, we don't do anything. Since x86 uses the ACPI processor
driver as well, we provide an empty #define.

Signed-off-by: Alex Chiang <achiang@hp.com>
---
arch/ia64/kernel/topology.c | 7 +++++++
drivers/acpi/processor_core.c | 8 ++++++++
include/asm-ia64/cpu.h | 1 +
include/asm-ia64/topology.h | 1 +
include/asm-x86/topology.h | 2 ++
5 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/arch/ia64/kernel/topology.c b/arch/ia64/kernel/topology.c
index a2484fc..bb584b4 100644
--- a/arch/ia64/kernel/topology.c
+++ b/arch/ia64/kernel/topology.c
@@ -27,6 +27,13 @@

static struct ia64_cpu *sysfs_cpus;

+void ia64_fix_socket_id(int num, u32 slot)
+{
+ if (cpu_data(num)->socket_id = -1)
+ cpu_data(num)->socket_id= slot;
+}
+EXPORT_SYMBOL_GPL(ia64_fix_socket_id);
+
int arch_register_cpu(int num)
{
#if defined (CONFIG_ACPI) && defined (CONFIG_HOTPLUG_CPU)
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index a825b43..89578d4 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -612,6 +612,14 @@ static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
request_region(pr->throttling.address, 6, "ACPI CPU throttle");
}

+ /*
+ * If ACPI describes a slot number for this CPU, we can use it
+ * to fix a broken topology->physical_package_id.
+ */
+ status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
+ if (ACPI_SUCCESS(status))
+ arch_fix_phys_package_id(pr->id, object.integer.value);
+
return 0;
}

diff --git a/include/asm-ia64/cpu.h b/include/asm-ia64/cpu.h
index e87fa32..9ba5155 100644
--- a/include/asm-ia64/cpu.h
+++ b/include/asm-ia64/cpu.h
@@ -14,6 +14,7 @@ DECLARE_PER_CPU(struct ia64_cpu, cpu_devices);

DECLARE_PER_CPU(int, cpu_state);

+extern void arch_fix_phys_package_id(int num, u32 slot);
extern int arch_register_cpu(int num);
#ifdef CONFIG_HOTPLUG_CPU
extern void arch_unregister_cpu(int);
diff --git a/include/asm-ia64/topology.h b/include/asm-ia64/topology.h
index f2f72ef..8e68f0f 100644
--- a/include/asm-ia64/topology.h
+++ b/include/asm-ia64/topology.h
@@ -116,6 +116,7 @@ void build_cpu_to_node_map(void);
#define smt_capable() (smp_num_siblings > 1)
#endif

+#define arch_fix_phys_package_id(num, slot) ia64_fix_socket_id(num, slot)
#define pcibus_to_cpumask(bus) (pcibus_to_node(bus) = -1 ? \
CPU_MASK_ALL : \
node_to_cpumask(pcibus_to_node(bus)) \
diff --git a/include/asm-x86/topology.h b/include/asm-x86/topology.h
index 2207326..efa3108 100644
--- a/include/asm-x86/topology.h
+++ b/include/asm-x86/topology.h
@@ -193,6 +193,8 @@ extern cpumask_t cpu_coregroup_map(int cpu);
#define topology_thread_siblings(cpu) (per_cpu(cpu_sibling_map, cpu))
#endif

+#define arch_fix_phys_package_id(num, slot)
+
#ifdef CONFIG_SMP
#define mc_capable() (boot_cpu_data.x86_max_cores > 1)
#define smt_capable() (smp_num_siblings > 1)
--
1.5.3.1.g1e61